TUN-6666: Define packet package

This package defines IP and ICMP packet, decoders, encoder and flow

connection/quic.go

@@ -20,6 +20,7 @@ import (
 
 	"github.com/cloudflare/cloudflared/datagramsession"
 	"github.com/cloudflare/cloudflared/ingress"
+	"github.com/cloudflare/cloudflared/packet"
 	quicpogs "github.com/cloudflare/cloudflared/quic"
 	"github.com/cloudflare/cloudflared/tracing"
 	tunnelpogs "github.com/cloudflare/cloudflared/tunnelrpc/pogs"
@@ -66,9 +67,9 @@ func NewQUICConnection(
 		return nil, &EdgeQuicDialError{Cause: err}
 	}
 
-	demuxChan := make(chan *quicpogs.SessionDatagram, demuxChanCapacity)
+	demuxChan := make(chan *packet.Session, demuxChanCapacity)
 	datagramMuxer := quicpogs.NewDatagramMuxer(session, logger, demuxChan)
-	sessionManager := datagramsession.NewManager(logger, datagramMuxer.MuxSession, demuxChan)
+	sessionManager := datagramsession.NewManager(logger, datagramMuxer.SendToSession, demuxChan)
 
 	return &QUICConnection{
 		session:              session,

datagramsession/manager.go

@@ -9,7 +9,7 @@ import (
 	"github.com/google/uuid"
 	"github.com/rs/zerolog"
 
-	quicpogs "github.com/cloudflare/cloudflared/quic"
+	"github.com/cloudflare/cloudflared/packet"
 )
 
 const (
@@ -37,7 +37,7 @@ type manager struct {
 	registrationChan   chan *registerSessionEvent
 	unregistrationChan chan *unregisterSessionEvent
 	sendFunc           transportSender
-	receiveChan        <-chan *quicpogs.SessionDatagram
+	receiveChan        <-chan *packet.Session
 	closedChan         <-chan struct{}
 	sessions           map[uuid.UUID]*Session
 	log                *zerolog.Logger
@@ -45,7 +45,7 @@ type manager struct {
 	timeout time.Duration
 }
 
-func NewManager(log *zerolog.Logger, sendF transportSender, receiveChan <-chan *quicpogs.SessionDatagram) *manager {
+func NewManager(log *zerolog.Logger, sendF transportSender, receiveChan <-chan *packet.Session) *manager {
 	return &manager{
 		registrationChan:   make(chan *registerSessionEvent),
 		unregistrationChan: make(chan *unregisterSessionEvent),
@@ -163,7 +163,7 @@ func (m *manager) unregisterSession(unregistration *unregisterSessionEvent) {
 	}
 }
 
-func (m *manager) sendToSession(datagram *quicpogs.SessionDatagram) {
+func (m *manager) sendToSession(datagram *packet.Session) {
 	session, ok := m.sessions[datagram.ID]
 	if !ok {
 		m.log.Error().Str("sessionID", datagram.ID.String()).Msg("session not found")

datagramsession/manager_test.go

@@ -15,7 +15,7 @@ import (
 	"github.com/stretchr/testify/require"
 	"golang.org/x/sync/errgroup"
 
-	quicpogs "github.com/cloudflare/cloudflared/quic"
+	"github.com/cloudflare/cloudflared/packet"
 )
 
 var (
@@ -29,7 +29,7 @@ func TestManagerServe(t *testing.T) {
 		remoteUnregisterMsg = "eyeball closed connection"
 	)
 
-	requestChan := make(chan *quicpogs.SessionDatagram)
+	requestChan := make(chan *packet.Session)
 	transport := mockQUICTransport{
 		sessions: make(map[uuid.UUID]chan []byte),
 	}
@@ -241,9 +241,9 @@ type mockQUICTransport struct {
 	sessions map[uuid.UUID]chan []byte
 }
 
-func (me *mockQUICTransport) MuxSession(id uuid.UUID, payload []byte) error {
-	session := me.sessions[id]
-	session <- payload
+func (me *mockQUICTransport) MuxSession(session *packet.Session) error {
+	s := me.sessions[session.ID]
+	s <- session.Payload
 	return nil
 }
 
@@ -255,9 +255,9 @@ type mockEyeballSession struct {
 	respReceiver     <-chan []byte
 }
 
-func (me *mockEyeballSession) serve(ctx context.Context, requestChan chan *quicpogs.SessionDatagram) error {
+func (me *mockEyeballSession) serve(ctx context.Context, requestChan chan *packet.Session) error {
 	for i := 0; i < me.expectedMsgCount; i++ {
-		requestChan <- &quicpogs.SessionDatagram{
+		requestChan <- &packet.Session{
 			ID:      me.id,
 			Payload: me.expectedMsg,
 		}

datagramsession/session.go

@@ -9,6 +9,8 @@ import (
 
 	"github.com/google/uuid"
 	"github.com/rs/zerolog"
+
+	"github.com/cloudflare/cloudflared/packet"
 )
 
 const (
@@ -19,7 +21,7 @@ func SessionIdleErr(timeout time.Duration) error {
 	return fmt.Errorf("session idle for %v", timeout)
 }
 
-type transportSender func(sessionID uuid.UUID, payload []byte) error
+type transportSender func(session *packet.Session) error
 
 // Session is a bidirectional pipe of datagrams between transport and dstConn
 // Destination can be a connection with origin or with eyeball
@@ -101,7 +103,11 @@ func (s *Session) dstToTransport(buffer []byte) (closeSession bool, err error) {
 	s.markActive()
 	// https://pkg.go.dev/io#Reader suggests caller should always process n > 0 bytes
 	if n > 0 || err == nil {
-		if sendErr := s.sendFunc(s.ID, buffer[:n]); sendErr != nil {
+		session := packet.Session{
+			ID:      s.ID,
+			Payload: buffer[:n],
+		}
+		if sendErr := s.sendFunc(&session); sendErr != nil {
 			return false, sendErr
 		}
 	}

datagramsession/session_test.go

@@ -15,7 +15,7 @@ import (
 	"github.com/stretchr/testify/require"
 	"golang.org/x/sync/errgroup"
 
-	quicpogs "github.com/cloudflare/cloudflared/quic"
+	"github.com/cloudflare/cloudflared/packet"
 )
 
 // TestCloseSession makes sure a session will stop after context is done
@@ -118,7 +118,7 @@ func testActiveSessionNotClosed(t *testing.T, readFromDst bool, writeToDst bool)
 	cfdConn, originConn := net.Pipe()
 	payload := testPayload(sessionID)
 
-	respChan := make(chan *quicpogs.SessionDatagram)
+	respChan := make(chan *packet.Session)
 	sender := newMockTransportSender(sessionID, payload)
 	mg := NewManager(&nopLogger, sender.muxSession, respChan)
 	session := mg.newSession(sessionID, cfdConn)
@@ -243,12 +243,12 @@ func newMockTransportSender(expectedSessionID uuid.UUID, expectedPayload []byte)
 	}
 }
 
-func (mts *mockTransportSender) muxSession(sessionID uuid.UUID, payload []byte) error {
-	if sessionID != mts.expectedSessionID {
-		return fmt.Errorf("Expect session %s, got %s", mts.expectedSessionID, sessionID)
+func (mts *mockTransportSender) muxSession(session *packet.Session) error {
+	if session.ID != mts.expectedSessionID {
+		return fmt.Errorf("Expect session %s, got %s", mts.expectedSessionID, session.ID)
 	}
-	if !bytes.Equal(payload, mts.expectedPayload) {
-		return fmt.Errorf("Expect %v, read %v", mts.expectedPayload, payload)
+	if !bytes.Equal(session.Payload, mts.expectedPayload) {
+		return fmt.Errorf("Expect %v, read %v", mts.expectedPayload, session.Payload)
 	}
 	return nil
 }
@@ -258,7 +258,7 @@ type sendOnceTransportSender struct {
 	sentChan   chan struct{}
 }
 
-func (sots *sendOnceTransportSender) muxSession(sessionID uuid.UUID, payload []byte) error {
+func (sots *sendOnceTransportSender) muxSession(session *packet.Session) error {
 	defer close(sots.sentChan)
-	return sots.baseSender.muxSession(sessionID, payload)
+	return sots.baseSender.muxSession(session)
 }

go.mod

@@ -34,9 +34,9 @@ require (
 	go.opentelemetry.io/proto/otlp v0.15.0
 	go.uber.org/automaxprocs v1.4.0
 	golang.org/x/crypto v0.0.0-20220427172511-eb4f295cb31f
-	golang.org/x/net v0.0.0-20220624214902-1bab6f366d9e
+	golang.org/x/net v0.0.0-20220812174116-3211cb980234
 	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c
-	golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a
+	golang.org/x/sys v0.0.0-20220728004956-3c1f35247d10
 	golang.org/x/term v0.0.0-20210927222741-03fcf44c2211
 	google.golang.org/protobuf v1.28.0
 	gopkg.in/coreos/go-oidc.v2 v2.2.1
@@ -67,6 +67,7 @@ require (
 	github.com/gobwas/httphead v0.0.0-20200921212729-da3d93bc3c58 // indirect
 	github.com/gobwas/pool v0.2.1 // indirect
 	github.com/golang/protobuf v1.5.2 // indirect
+	github.com/google/gopacket v1.1.19 // indirect
 	github.com/grpc-ecosystem/grpc-gateway/v2 v2.7.0 // indirect
 	github.com/grpc-ecosystem/grpc-opentracing v0.0.0-20180507213350-8e809c8a8645 // indirect
 	github.com/kylelemons/godebug v1.1.0 // indirect

go.sum

@@ -292,6 +292,8 @@ github.com/google/go-querystring v1.0.0/go.mod h1:odCYkC5MyYFN7vkCjXpyrEuKhc/BUO
 github.com/google/gofuzz v1.0.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
 github.com/google/gofuzz v1.1.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
 github.com/google/gofuzz v1.2.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
+github.com/google/gopacket v1.1.19 h1:ves8RnFZPGiFnTS0uPQStjwru6uO6h+nlr9j6fL7kF8=
+github.com/google/gopacket v1.1.19/go.mod h1:iJ8V8n6KS+z2U1A8pUwu8bW5SyEMkXJB8Yo/Vo+TKTo=
 github.com/google/martian v2.1.0+incompatible/go.mod h1:9I4somxYTbIHy5NJKHRl3wXiIaQGbYVAs8BPL6v8lEs=
 github.com/google/martian/v3 v3.0.0/go.mod h1:y5Zk1BBys9G+gd6Jrk0W3cC1+ELVxBWuIGO+w/tUAp0=
 github.com/google/martian/v3 v3.1.0/go.mod h1:y5Zk1BBys9G+gd6Jrk0W3cC1+ELVxBWuIGO+w/tUAp0=
@@ -710,6 +712,8 @@ golang.org/x/net v0.0.0-20211209124913-491a49abca63/go.mod h1:9nx3DQGgdP8bBQD5qx
 golang.org/x/net v0.0.0-20211216030914-fe4d6282115f/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
 golang.org/x/net v0.0.0-20220624214902-1bab6f366d9e h1:TsQ7F31D3bUCLeqPT0u+yjp1guoArKaNKmCr22PYgTQ=
 golang.org/x/net v0.0.0-20220624214902-1bab6f366d9e/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
+golang.org/x/net v0.0.0-20220812174116-3211cb980234 h1:RDqmgfe7SvlMWoqC3xwQ2blLO3fcWcxMa3eBLRdRW7E=
+golang.org/x/net v0.0.0-20220812174116-3211cb980234/go.mod h1:YDH+HFinaLZZlnHAfSS6ZXJJ9M9t4Dl22yv3iI2vPwk=
 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/oauth2 v0.0.0-20181017192945-9dcd33a902f4/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/oauth2 v0.0.0-20181203162652-d668ce993890/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
@@ -816,6 +820,8 @@ golang.org/x/sys v0.0.0-20211216021012-1d35b9e2eb4e/go.mod h1:oPkhp1MJrh7nUepCBc
 golang.org/x/sys v0.0.0-20220114195835-da31bd327af9/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a h1:dGzPydgVsqGcTRVwiLJ1jVbufYwmzD3LfVPLKsKg+0k=
 golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220728004956-3c1f35247d10 h1:WIoqL4EROvwiPdUtaip4VcDdpZ4kha7wBWZrbVKCIZg=
+golang.org/x/sys v0.0.0-20220728004956-3c1f35247d10/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/term v0.0.0-20210615171337-6886f2dfbf5b/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
 golang.org/x/term v0.0.0-20210927222741-03fcf44c2211 h1:JGgROgKl9N8DuW20oFS5gxc+lE67/N3FcwmBPMe7ArY=

packet/decoder.go

@@ -0,0 +1,184 @@
+package packet
+
+import (
+	"fmt"
+
+	"github.com/google/gopacket"
+	"github.com/google/gopacket/layers"
+	"github.com/pkg/errors"
+	"golang.org/x/net/icmp"
+)
+
+func FindProtocol(p []byte) (layers.IPProtocol, error) {
+	version, err := FindIPVersion(p)
+	if err != nil {
+		return 0, err
+	}
+	switch version {
+	case 4:
+		if len(p) < ipv4HeaderLen {
+			return 0, fmt.Errorf("IPv4 packet should have at least %d bytes, got %d bytes", ipv4HeaderLen, len(p))
+		}
+		// Protocol is in the 10th byte of IPv4 header
+		return layers.IPProtocol(p[9]), nil
+	case 6:
+		if len(p) < ipv6HeaderLen {
+			return 0, fmt.Errorf("IPv6 packet should have at least %d bytes, got %d bytes", ipv6HeaderLen, len(p))
+		}
+		// Next header is in the 7th byte of IPv6 header
+		return layers.IPProtocol(p[6]), nil
+	default:
+		return 0, fmt.Errorf("unknow ip version %d", version)
+	}
+}
+
+func FindIPVersion(p []byte) (uint8, error) {
+	if len(p) == 0 {
+		return 0, fmt.Errorf("packet length is 0")
+	}
+	return p[0] >> 4, nil
+}
+
+// IPDecoder decodes raw packets into IP. It can process packets sequentially without allocating
+// memory for the layers, so it cannot be called concurrently.
+type IPDecoder struct {
+	ipv4   *layers.IPv4
+	ipv6   *layers.IPv6
+	layers uint8
+
+	v4parser *gopacket.DecodingLayerParser
+	v6parser *gopacket.DecodingLayerParser
+}
+
+func NewIPDecoder() *IPDecoder {
+	var (
+		ipv4 layers.IPv4
+		ipv6 layers.IPv6
+	)
+	dlpv4 := gopacket.NewDecodingLayerParser(layers.LayerTypeIPv4)
+	dlpv4.SetDecodingLayerContainer(gopacket.DecodingLayerSparse(nil))
+	dlpv4.AddDecodingLayer(&ipv4)
+	// Stop parsing when it encounter a layer that it doesn't have a parser
+	dlpv4.IgnoreUnsupported = true
+
+	dlpv6 := gopacket.NewDecodingLayerParser(layers.LayerTypeIPv6)
+	dlpv6.SetDecodingLayerContainer(gopacket.DecodingLayerSparse(nil))
+	dlpv6.AddDecodingLayer(&ipv6)
+	dlpv6.IgnoreUnsupported = true
+
+	return &IPDecoder{
+		ipv4:     &ipv4,
+		ipv6:     &ipv6,
+		layers:   1,
+		v4parser: dlpv4,
+		v6parser: dlpv6,
+	}
+}
+
+func (pd *IPDecoder) Decode(packet []byte) (*IP, error) {
+	// Should decode to IP layer
+	decoded, err := pd.decodeByVersion(packet)
+	if err != nil {
+		return nil, err
+	}
+
+	for _, layerType := range decoded {
+		switch layerType {
+		case layers.LayerTypeIPv4:
+			return newIPv4(pd.ipv4)
+		case layers.LayerTypeIPv6:
+			return newIPv6(pd.ipv6)
+		}
+	}
+	return nil, fmt.Errorf("no ip layer is decoded")
+}
+
+func (pd *IPDecoder) decodeByVersion(packet []byte) ([]gopacket.LayerType, error) {
+	version, err := FindIPVersion(packet)
+	if err != nil {
+		return nil, err
+	}
+	decoded := make([]gopacket.LayerType, 0, pd.layers)
+	switch version {
+	case 4:
+		err = pd.v4parser.DecodeLayers(packet, &decoded)
+	case 6:
+		err = pd.v6parser.DecodeLayers(packet, &decoded)
+	default:
+		err = fmt.Errorf("unknow ip version %d", version)
+	}
+	if err != nil {
+		return nil, err
+	}
+	return decoded, nil
+}
+
+// ICMPDecoder decodes raw packets into IP and ICMP. It can process packets sequentially without allocating
+// memory for the layers, so it cannot be called concurrently.
+type ICMPDecoder struct {
+	*IPDecoder
+	icmpv4 *layers.ICMPv4
+	icmpv6 *layers.ICMPv6
+}
+
+func NewICMPDecoder() *ICMPDecoder {
+	ipDecoder := NewIPDecoder()
+
+	var (
+		icmpv4 layers.ICMPv4
+		icmpv6 layers.ICMPv6
+	)
+	ipDecoder.layers++
+	ipDecoder.v4parser.AddDecodingLayer(&icmpv4)
+	ipDecoder.v6parser.AddDecodingLayer(&icmpv6)
+
+	return &ICMPDecoder{
+		IPDecoder: ipDecoder,
+		icmpv4:    &icmpv4,
+		icmpv6:    &icmpv6,
+	}
+}
+
+func (pd *ICMPDecoder) Decode(packet []byte) (*ICMP, error) {
+	// Should decode to IP and optionally ICMP layer
+	decoded, err := pd.decodeByVersion(packet)
+	if err != nil {
+		return nil, err
+	}
+
+	for _, layerType := range decoded {
+		switch layerType {
+		case layers.LayerTypeICMPv4:
+			ipv4, err := newIPv4(pd.ipv4)
+			if err != nil {
+				return nil, err
+			}
+			msg, err := icmp.ParseMessage(int(layers.IPProtocolICMPv4), append(pd.icmpv4.Contents, pd.icmpv4.Payload...))
+			if err != nil {
+				return nil, errors.Wrap(err, "failed to parse ICMPv4 message")
+			}
+			return &ICMP{
+				IP:      ipv4,
+				Message: msg,
+			}, nil
+		case layers.LayerTypeICMPv6:
+			ipv6, err := newIPv6(pd.ipv6)
+			if err != nil {
+				return nil, err
+			}
+			msg, err := icmp.ParseMessage(int(layers.IPProtocolICMPv6), append(pd.icmpv6.Contents, pd.icmpv6.Payload...))
+			if err != nil {
+				return nil, errors.Wrap(err, "failed to parse ICMPv6")
+			}
+			return &ICMP{
+				IP:      ipv6,
+				Message: msg,
+			}, nil
+		}
+	}
+	layers := make([]string, len(decoded))
+	for i, l := range decoded {
+		layers[i] = l.String()
+	}
+	return nil, fmt.Errorf("Expect to decode IP and ICMP layers, got %s", layers)
+}

packet/decoder_test.go

@@ -0,0 +1,252 @@
+package packet
+
+import (
+	"net"
+	"net/netip"
+	"testing"
+
+	"github.com/google/gopacket"
+	"github.com/google/gopacket/layers"
+	"github.com/stretchr/testify/require"
+	"golang.org/x/net/icmp"
+	"golang.org/x/net/ipv4"
+	"golang.org/x/net/ipv6"
+)
+
+func TestDecodeIP(t *testing.T) {
+	ipDecoder := NewIPDecoder()
+	icmpDecoder := NewICMPDecoder()
+	udps := []UDP{
+		{
+			IP: IP{
+				Src:      netip.MustParseAddr("172.16.0.1"),
+				Dst:      netip.MustParseAddr("10.0.0.1"),
+				Protocol: layers.IPProtocolUDP,
+			},
+			SrcPort: 31678,
+			DstPort: 53,
+		},
+		{
+
+			IP: IP{
+				Src:      netip.MustParseAddr("fd51:2391:523:f4ee::1"),
+				Dst:      netip.MustParseAddr("fd51:2391:697:f4ee::2"),
+				Protocol: layers.IPProtocolUDP,
+			},
+			SrcPort: 52139,
+			DstPort: 1053,
+		},
+	}
+
+	encoder := NewEncoder()
+	for _, udp := range udps {
+		p, err := encoder.Encode(&udp)
+		require.NoError(t, err)
+
+		ipPacket, err := ipDecoder.Decode(p.Data)
+		require.NoError(t, err)
+		assertIPLayer(t, &udp.IP, ipPacket)
+
+		icmpPacket, err := icmpDecoder.Decode(p.Data)
+		require.Error(t, err)
+		require.Nil(t, icmpPacket)
+	}
+}
+
+func TestDecodeICMP(t *testing.T) {
+	ipDecoder := NewIPDecoder()
+	icmpDecoder := NewICMPDecoder()
+	var (
+		ipv4Packet = IP{
+			Src:      netip.MustParseAddr("172.16.0.1"),
+			Dst:      netip.MustParseAddr("10.0.0.1"),
+			Protocol: layers.IPProtocolICMPv4,
+		}
+		ipv6Packet = IP{
+			Src:      netip.MustParseAddr("fd51:2391:523:f4ee::1"),
+			Dst:      netip.MustParseAddr("fd51:2391:697:f4ee::2"),
+			Protocol: layers.IPProtocolICMPv6,
+		}
+		icmpID  = 100
+		icmpSeq = 52819
+	)
+	tests := []struct {
+		testCase string
+		packet   *ICMP
+	}{
+		{
+			testCase: "icmpv4 time exceed",
+			packet: &ICMP{
+				IP: &ipv4Packet,
+				Message: &icmp.Message{
+					Type: ipv4.ICMPTypeTimeExceeded,
+					Code: 0,
+					Body: &icmp.TimeExceeded{
+						Data: []byte("original packet"),
+					},
+				},
+			},
+		},
+		{
+			testCase: "icmpv4 echo",
+			packet: &ICMP{
+				IP: &ipv4Packet,
+				Message: &icmp.Message{
+					Type: ipv4.ICMPTypeEcho,
+					Code: 0,
+					Body: &icmp.Echo{
+						ID:   icmpID,
+						Seq:  icmpSeq,
+						Data: []byte("icmpv4 echo"),
+					},
+				},
+			},
+		},
+		{
+			testCase: "icmpv6 destination unreachable",
+			packet: &ICMP{
+				IP: &ipv6Packet,
+				Message: &icmp.Message{
+					Type: ipv6.ICMPTypeDestinationUnreachable,
+					Code: 4,
+					Body: &icmp.DstUnreach{
+						Data: []byte("original packet"),
+					},
+				},
+			},
+		},
+		{
+			testCase: "icmpv6 echo",
+			packet: &ICMP{
+				IP: &ipv6Packet,
+				Message: &icmp.Message{
+					Type: ipv6.ICMPTypeEchoRequest,
+					Code: 0,
+					Body: &icmp.Echo{
+						ID:   icmpID,
+						Seq:  icmpSeq,
+						Data: []byte("icmpv6 echo"),
+					},
+				},
+			},
+		},
+	}
+
+	encoder := NewEncoder()
+	for _, test := range tests {
+		p, err := encoder.Encode(test.packet)
+		require.NoError(t, err)
+
+		ipPacket, err := ipDecoder.Decode(p.Data)
+		require.NoError(t, err)
+		if ipPacket.Src.Is4() {
+			assertIPLayer(t, &ipv4Packet, ipPacket)
+		} else {
+			assertIPLayer(t, &ipv6Packet, ipPacket)
+		}
+		icmpPacket, err := icmpDecoder.Decode(p.Data)
+		require.NoError(t, err)
+		require.Equal(t, ipPacket, icmpPacket.IP)
+
+		require.Equal(t, test.packet.Type, icmpPacket.Type)
+		require.Equal(t, test.packet.Code, icmpPacket.Code)
+		require.Equal(t, test.packet.Body, icmpPacket.Body)
+		expectedBody, err := test.packet.Body.Marshal(test.packet.Type.Protocol())
+		require.NoError(t, err)
+		decodedBody, err := icmpPacket.Body.Marshal(test.packet.Type.Protocol())
+		require.NoError(t, err)
+		require.Equal(t, expectedBody, decodedBody)
+	}
+}
+
+// TestDecodeBadPackets makes sure decoders don't decode invalid packets
+func TestDecodeBadPackets(t *testing.T) {
+	var (
+		srcIPv4 = net.ParseIP("172.16.0.1")
+		dstIPv4 = net.ParseIP("10.0.0.1")
+	)
+
+	ipLayer := layers.IPv4{
+		Version:  10,
+		SrcIP:    srcIPv4,
+		DstIP:    dstIPv4,
+		Protocol: layers.IPProtocolICMPv4,
+		TTL:      defaultTTL,
+	}
+	icmpLayer := layers.ICMPv4{
+		TypeCode: layers.CreateICMPv4TypeCode(uint8(ipv4.ICMPTypeEcho), 0),
+		Id:       100,
+		Seq:      52819,
+	}
+	wrongIPVersion, err := createPacket(&ipLayer, &icmpLayer, nil, nil)
+	require.NoError(t, err)
+
+	tests := []struct {
+		testCase string
+		packet   []byte
+	}{
+		{
+			testCase: "unknown IP version",
+			packet:   wrongIPVersion,
+		},
+		{
+			testCase: "invalid packet",
+			packet:   []byte("not a packet"),
+		},
+		{
+			testCase: "zero length packet",
+			packet:   []byte{},
+		},
+	}
+
+	ipDecoder := NewIPDecoder()
+	icmpDecoder := NewICMPDecoder()
+	for _, test := range tests {
+		ipPacket, err := ipDecoder.Decode(test.packet)
+		require.Error(t, err)
+		require.Nil(t, ipPacket)
+
+		icmpPacket, err := icmpDecoder.Decode(test.packet)
+		require.Error(t, err)
+		require.Nil(t, icmpPacket)
+	}
+}
+
+func createPacket(ipLayer, secondLayer, thirdLayer gopacket.SerializableLayer, body []byte) ([]byte, error) {
+	payload := gopacket.Payload(body)
+	packet := gopacket.NewSerializeBuffer()
+	var err error
+	if thirdLayer != nil {
+		err = gopacket.SerializeLayers(packet, serializeOpts, ipLayer, secondLayer, thirdLayer, payload)
+	} else {
+		err = gopacket.SerializeLayers(packet, serializeOpts, ipLayer, secondLayer, payload)
+	}
+	if err != nil {
+		return nil, err
+	}
+	return packet.Bytes(), nil
+}
+
+func assertIPLayer(t *testing.T, expected, actual *IP) {
+	require.Equal(t, expected.Src, actual.Src)
+	require.Equal(t, expected.Dst, actual.Dst)
+	require.Equal(t, expected.Protocol, actual.Protocol)
+}
+
+type UDP struct {
+	IP
+	SrcPort, DstPort layers.UDPPort
+}
+
+func (u *UDP) EncodeLayers() ([]gopacket.SerializableLayer, error) {
+	ipLayers, err := u.IP.EncodeLayers()
+	if err != nil {
+		return nil, err
+	}
+	udpLayer := layers.UDP{
+		SrcPort: u.SrcPort,
+		DstPort: u.DstPort,
+	}
+	udpLayer.SetNetworkLayerForChecksum(ipLayers[0].(gopacket.NetworkLayer))
+	return append(ipLayers, &udpLayer), nil
+}

packet/encoder.go

@@ -0,0 +1,39 @@
+package packet
+
+import "github.com/google/gopacket"
+
+var (
+	serializeOpts = gopacket.SerializeOptions{
+		FixLengths:       true,
+		ComputeChecksums: true,
+	}
+)
+
+// RawPacket represents a raw packet or one encoded by Encoder
+type RawPacket struct {
+	Data []byte
+}
+
+type Encoder struct {
+	// buf is reusable because SerializeLayers calls the Clear method before each encoding
+	buf gopacket.SerializeBuffer
+}
+
+func NewEncoder() *Encoder {
+	return &Encoder{
+		buf: gopacket.NewSerializeBuffer(),
+	}
+}
+
+func (e Encoder) Encode(packet Packet) (RawPacket, error) {
+	encodedLayers, err := packet.EncodeLayers()
+	if err != nil {
+		return RawPacket{}, err
+	}
+	if err := gopacket.SerializeLayers(e.buf, serializeOpts, encodedLayers...); err != nil {
+		return RawPacket{}, err
+	}
+	return RawPacket{
+		Data: e.buf.Bytes(),
+	}, nil
+}

packet/flow.go

@@ -0,0 +1,97 @@
+package packet
+
+import (
+	"errors"
+	"net"
+	"net/netip"
+	"sync"
+)
+
+type flowID string
+
+var (
+	ErrFlowNotFound = errors.New("flow not found")
+)
+
+func newFlowID(ip net.IP) flowID {
+	return flowID(ip.String())
+}
+
+type Flow struct {
+	Src       netip.Addr
+	Dst       netip.Addr
+	Responder FlowResponder
+}
+
+func isSameFlow(f1, f2 *Flow) bool {
+	if f1 == nil || f2 == nil {
+		return false
+	}
+	return *f1 == *f2
+}
+
+// FlowResponder sends response packets to the flow
+type FlowResponder interface {
+	// SendPacket returns a packet to the flow. It must not modify the packet,
+	// and after return it must not read the packet
+	SendPacket(pk RawPacket) error
+}
+
+// SrcFlowTracker tracks flow from the perspective of eyeball to origin
+// flowID is the source IP
+type SrcFlowTracker struct {
+	lock  sync.RWMutex
+	flows map[flowID]*Flow
+}
+
+func NewSrcFlowTracker() *SrcFlowTracker {
+	return &SrcFlowTracker{
+		flows: make(map[flowID]*Flow),
+	}
+}
+
+func (sft *SrcFlowTracker) Get(srcIP net.IP) (*Flow, bool) {
+	sft.lock.RLock()
+	defer sft.lock.RUnlock()
+	id := newFlowID(srcIP)
+	flow, ok := sft.flows[id]
+	return flow, ok
+}
+
+// Registers a flow. If shouldReplace = true, replace the current flow
+func (sft *SrcFlowTracker) Register(flow *Flow, shouldReplace bool) (replaced bool) {
+	sft.lock.Lock()
+	defer sft.lock.Unlock()
+	id := flowID(flow.Src.String())
+	currentFlow, ok := sft.flows[id]
+	if !ok {
+		sft.flows[id] = flow
+		return false
+	}
+
+	if shouldReplace && isSameFlow(currentFlow, flow) {
+		sft.flows[id] = flow
+		return true
+	}
+	return false
+}
+
+// Unregisters a flow. If force = true, delete it even if it maps to a different flow
+func (sft *SrcFlowTracker) Unregister(flow *Flow, force bool) (forceDeleted bool) {
+	sft.lock.Lock()
+	defer sft.lock.Unlock()
+	id := flowID(flow.Src.String())
+	currentFlow, ok := sft.flows[id]
+	if !ok {
+		return false
+	}
+	if isSameFlow(currentFlow, flow) {
+		delete(sft.flows, id)
+		return false
+	}
+	if force {
+		delete(sft.flows, id)
+		return true
+	}
+	return false
+}

packet/packet.go

@@ -0,0 +1,115 @@
+package packet
+
+import (
+	"fmt"
+	"net/netip"
+
+	"github.com/google/gopacket"
+	"github.com/google/gopacket/layers"
+	"golang.org/x/net/icmp"
+)
+
+const (
+	defaultTTL    uint8 = 64
+	ipv4HeaderLen       = 20
+	ipv6HeaderLen       = 40
+)
+
+// Packet represents an IP packet or a packet that is encapsulated by IP
+type Packet interface {
+	// IPLayer returns the IP of the packet
+	IPLayer() *IP
+	// EncodeLayers returns the layers that make up this packet. They can be passed to an Encoder to serialize into RawPacket
+	EncodeLayers() ([]gopacket.SerializableLayer, error)
+}
+
+// IP represents a generic IP packet. It can be embedded in more specific IP protocols
+type IP struct {
+	Src      netip.Addr
+	Dst      netip.Addr
+	Protocol layers.IPProtocol
+}
+
+func newIPv4(ipLayer *layers.IPv4) (*IP, error) {
+	src, ok := netip.AddrFromSlice(ipLayer.SrcIP)
+	if !ok {
+		return nil, fmt.Errorf("cannot convert source IP %s to netip.Addr", ipLayer.SrcIP)
+	}
+	dst, ok := netip.AddrFromSlice(ipLayer.DstIP)
+	if !ok {
+		return nil, fmt.Errorf("cannot convert source IP %s to netip.Addr", ipLayer.DstIP)
+	}
+	return &IP{
+		Src:      src,
+		Dst:      dst,
+		Protocol: ipLayer.Protocol,
+	}, nil
+}
+
+func newIPv6(ipLayer *layers.IPv6) (*IP, error) {
+	src, ok := netip.AddrFromSlice(ipLayer.SrcIP)
+	if !ok {
+		return nil, fmt.Errorf("cannot convert source IP %s to netip.Addr", ipLayer.SrcIP)
+	}
+	dst, ok := netip.AddrFromSlice(ipLayer.DstIP)
+	if !ok {
+		return nil, fmt.Errorf("cannot convert source IP %s to netip.Addr", ipLayer.DstIP)
+	}
+	return &IP{
+		Src:      src,
+		Dst:      dst,
+		Protocol: ipLayer.NextHeader,
+	}, nil
+}
+
+func (ip *IP) IPLayer() *IP {
+	return ip
+}
+
+func (ip *IP) isIPv4() bool {
+	return ip.Src.Is4()
+}
+
+func (ip *IP) EncodeLayers() ([]gopacket.SerializableLayer, error) {
+	if ip.isIPv4() {
+		return []gopacket.SerializableLayer{
+			&layers.IPv4{
+				Version:  4,
+				SrcIP:    ip.Src.AsSlice(),
+				DstIP:    ip.Dst.AsSlice(),
+				Protocol: layers.IPProtocol(ip.Protocol),
+				TTL:      defaultTTL,
+			},
+		}, nil
+	} else {
+		return []gopacket.SerializableLayer{
+			&layers.IPv6{
+				Version:    6,
+				SrcIP:      ip.Src.AsSlice(),
+				DstIP:      ip.Dst.AsSlice(),
+				NextHeader: layers.IPProtocol(ip.Protocol),
+				HopLimit:   defaultTTL,
+			},
+		}, nil
+	}
+}
+
+// ICMP represents is an IP packet + ICMP message
+type ICMP struct {
+	*IP
+	*icmp.Message
+}
+
+func (i *ICMP) EncodeLayers() ([]gopacket.SerializableLayer, error) {
+	ipLayers, err := i.IP.EncodeLayers()
+	if err != nil {
+		return nil, err
+	}
+
+	msg, err := i.Marshal(nil)
+	if err != nil {
+		return nil, err
+	}
+	icmpLayer := gopacket.Payload(msg)
+	return append(ipLayers, icmpLayer), nil
+}

packet/session.go

@@ -0,0 +1,8 @@
+package packet
+
+import "github.com/google/uuid"
+
+type Session struct {
+	ID      uuid.UUID
+	Payload []byte
+}

quic/datagram.go

@@ -8,21 +8,18 @@ import (
 	"github.com/lucas-clemente/quic-go"
 	"github.com/pkg/errors"
 	"github.com/rs/zerolog"
+
+	"github.com/cloudflare/cloudflared/packet"
 )
 
 const (
 	sessionIDLen = len(uuid.UUID{})
 )
 
-type SessionDatagram struct {
-	ID      uuid.UUID
-	Payload []byte
-}
-
 type BaseDatagramMuxer interface {
-	// MuxSession suffix the session ID to the payload so the other end of the QUIC connection can demultiplex the
-	// payload from multiple datagram sessions
-	MuxSession(sessionID uuid.UUID, payload []byte) error
+	// SendToSession suffix the session ID to the payload so the other end of the QUIC connection can demultiplex the
+	// payload from multiple datagram sessions.
+	SendToSession(session *packet.Session) error
 	// ServeReceive starts a loop to receive datagrams from the QUIC connection
 	ServeReceive(ctx context.Context) error
 }
@@ -30,10 +27,10 @@ type BaseDatagramMuxer interface {
 type DatagramMuxer struct {
 	session   quic.Connection
 	logger    *zerolog.Logger
-	demuxChan chan<- *SessionDatagram
+	demuxChan chan<- *packet.Session
 }
 
-func NewDatagramMuxer(quicSession quic.Connection, log *zerolog.Logger, demuxChan chan<- *SessionDatagram) *DatagramMuxer {
+func NewDatagramMuxer(quicSession quic.Connection, log *zerolog.Logger, demuxChan chan<- *packet.Session) *DatagramMuxer {
 	logger := log.With().Uint8("datagramVersion", 1).Logger()
 	return &DatagramMuxer{
 		session:   quicSession,
@@ -47,13 +44,13 @@ func (dm *DatagramMuxer) mtu() int {
 	return maxDatagramPayloadSize
 }
 
-func (dm *DatagramMuxer) MuxSession(sessionID uuid.UUID, payload []byte) error {
-	if len(payload) > dm.mtu() {
+func (dm *DatagramMuxer) SendToSession(session *packet.Session) error {
+	if len(session.Payload) > dm.mtu() {
 		// TODO: TUN-5302 return ICMP packet too big message
 		// drop packet for now, eventually reply with ICMP for PMTUD
-		return fmt.Errorf("origin UDP payload has %d bytes, which exceeds transport MTU %d", len(payload), dm.mtu())
+		return fmt.Errorf("origin UDP payload has %d bytes, which exceeds transport MTU %d", len(session.Payload), dm.mtu())
 	}
-	payloadWithMetadata, err := suffixSessionID(sessionID, payload)
+	payloadWithMetadata, err := suffixSessionID(session.ID, session.Payload)
 	if err != nil {
 		return errors.Wrap(err, "Failed to suffix session ID to datagram, it will be dropped")
 	}
@@ -86,7 +83,7 @@ func (dm *DatagramMuxer) demux(ctx context.Context, msg []byte) error {
 	if err != nil {
 		return err
 	}
-	sessionDatagram := SessionDatagram{
+	sessionDatagram := packet.Session{
 		ID:      sessionID,
 		Payload: payload,
 	}

quic/datagram_test.go

@@ -1,7 +1,6 @@
 package quic
 
 import (
-	"bytes"
 	"context"
 	"crypto/rand"
 	"crypto/rsa"
@@ -18,6 +17,8 @@ import (
 	"github.com/rs/zerolog"
 	"github.com/stretchr/testify/require"
 	"golang.org/x/sync/errgroup"
+
+	"github.com/cloudflare/cloudflared/packet"
 )
 
 var (
@@ -57,7 +58,7 @@ func TestDatagram(t *testing.T) {
 	maxPayload := make([]byte, maxDatagramPayloadSize)
 	noPayloadSession := uuid.New()
 	maxPayloadSession := uuid.New()
-	sessionToPayload := []*SessionDatagram{
+	sessionToPayload := []*packet.Session{
 		{
 			ID:      noPayloadSession,
 			Payload: make([]byte, 0),
@@ -75,7 +76,7 @@ func TestDatagram(t *testing.T) {
 	testDatagram(t, 2, sessionToPayload, flowPayloads)
 }
 
-func testDatagram(t *testing.T, version uint8, sessionToPayloads []*SessionDatagram, packetPayloads [][]byte) {
+func testDatagram(t *testing.T, version uint8, sessionToPayloads []*packet.Session, packetPayloads [][]byte) {
 	quicConfig := &quic.Config{
 		KeepAlivePeriod:      5 * time.Millisecond,
 		EnableDatagrams:      true,
@@ -95,7 +96,7 @@ func testDatagram(t *testing.T, version uint8, sessionToPayloads []*SessionDatag
 			return err
 		}
 
-		sessionDemuxChan := make(chan *SessionDatagram, 16)
+		sessionDemuxChan := make(chan *packet.Session, 16)
 
 		switch version {
 		case 1:
@@ -151,11 +152,14 @@ func testDatagram(t *testing.T, version uint8, sessionToPayloads []*SessionDatag
 			return fmt.Errorf("unknown datagram version %d", version)
 		}
 
-		for _, sessionDatagram := range sessionToPayloads {
-			require.NoError(t, muxer.MuxSession(sessionDatagram.ID, sessionDatagram.Payload))
+		for _, session := range sessionToPayloads {
+			require.NoError(t, muxer.SendToSession(session))
 		}
 		// Payload larger than transport MTU, should not be sent
-		require.Error(t, muxer.MuxSession(testSessionID, largePayload))
+		require.Error(t, muxer.SendToSession(&packet.Session{
+			ID:      testSessionID,
+			Payload: largePayload,
+		}))
 
 		// Wait for edge to finish receiving the messages
 		time.Sleep(time.Millisecond * 100)
@@ -198,35 +202,3 @@ func generateTLSConfig() *tls.Config {
 		NextProtos:   []string{"argotunnel"},
 	}
 }
-
-type sessionMuxer interface {
-	SendToSession(sessionID uuid.UUID, payload []byte) error
-}
-
-type mockSessionReceiver struct {
-	expectedSessionToPayload map[uuid.UUID][]byte
-	receivedCount            int
-}
-
-func (msr *mockSessionReceiver) ReceiveDatagram(sessionID uuid.UUID, payload []byte) error {
-	expectedPayload := msr.expectedSessionToPayload[sessionID]
-	if !bytes.Equal(expectedPayload, payload) {
-		return fmt.Errorf("expect %v to have payload %s, got %s", sessionID, string(expectedPayload), string(payload))
-	}
-	msr.receivedCount++
-	return nil
-}
-
-type mockFlowReceiver struct {
-	expectedPayloads [][]byte
-	receivedCount    int
-}
-
-func (mfr *mockFlowReceiver) ReceiveFlow(payload []byte) error {
-	expectedPayload := mfr.expectedPayloads[mfr.receivedCount]
-	if !bytes.Equal(expectedPayload, payload) {
-		return fmt.Errorf("expect flow %d to have payload %s, got %s", mfr.receivedCount, string(expectedPayload), string(payload))
-	}
-	mfr.receivedCount++
-	return nil
-}

quic/datagramv2.go

@@ -4,10 +4,11 @@ import (
 	"context"
 	"fmt"
 
-	"github.com/google/uuid"
 	"github.com/lucas-clemente/quic-go"
 	"github.com/pkg/errors"
 	"github.com/rs/zerolog"
+
+	"github.com/cloudflare/cloudflared/packet"
 )
 
 type datagramV2Type byte
@@ -33,14 +34,14 @@ func (dm *DatagramMuxerV2) mtu() int {
 type DatagramMuxerV2 struct {
 	session          quic.Connection
 	logger           *zerolog.Logger
-	sessionDemuxChan chan<- *SessionDatagram
+	sessionDemuxChan chan<- *packet.Session
 	packetDemuxChan  chan<- []byte
 }
 
 func NewDatagramMuxerV2(
 	quicSession quic.Connection,
 	log *zerolog.Logger,
-	sessionDemuxChan chan<- *SessionDatagram,
+	sessionDemuxChan chan<- *packet.Session,
 	packetDemuxChan chan<- []byte) *DatagramMuxerV2 {
 	logger := log.With().Uint8("datagramVersion", 2).Logger()
 	return &DatagramMuxerV2{
@@ -53,12 +54,12 @@ func NewDatagramMuxerV2(
 
 // MuxSession suffix the session ID and datagram version to the payload so the other end of the QUIC connection can
 // demultiplex the payload from multiple datagram sessions
-func (dm *DatagramMuxerV2) MuxSession(sessionID uuid.UUID, payload []byte) error {
-	if len(payload) > dm.mtu() {
+func (dm *DatagramMuxerV2) SendToSession(session *packet.Session) error {
+	if len(session.Payload) > dm.mtu() {
 		// TODO: TUN-5302 return ICMP packet too big message
-		return fmt.Errorf("origin UDP payload has %d bytes, which exceeds transport MTU %d", len(payload), dm.mtu())
+		return fmt.Errorf("origin UDP payload has %d bytes, which exceeds transport MTU %d", len(session.Payload), dm.mtu())
 	}
-	msgWithID, err := suffixSessionID(sessionID, payload)
+	msgWithID, err := suffixSessionID(session.ID, session.Payload)
 	if err != nil {
 		return errors.Wrap(err, "Failed to suffix session ID to datagram, it will be dropped")
 	}
@@ -113,7 +114,7 @@ func (dm *DatagramMuxerV2) demux(ctx context.Context, msgWithType []byte) error
 		if err != nil {
 			return err
 		}
-		sessionDatagram := SessionDatagram{
+		sessionDatagram := packet.Session{
 			ID:      sessionID,
 			Payload: payload,
 		}

vendor/github.com/google/gopacket/.gitignore

@@ -0,0 +1,38 @@
+# Compiled Object files, Static and Dynamic libs (Shared Objects)
+*.o
+*.a
+*.so
+
+# Folders
+_obj
+_test
+
+# Architecture specific extensions/prefixes
+*.[568vq]
+[568vq].out
+
+*.cgo1.go
+*.cgo2.c
+_cgo_defun.c
+_cgo_gotypes.go
+_cgo_export.*
+
+_testmain.go
+
+*.exe
+#*
+*~
+
+# examples binaries
+examples/synscan/synscan
+examples/pfdump/pfdump
+examples/pcapdump/pcapdump
+examples/httpassembly/httpassembly
+examples/statsassembly/statsassembly
+examples/arpscan/arpscan
+examples/bidirectional/bidirectional
+examples/bytediff/bytediff
+examples/reassemblydump/reassemblydump
+layers/gen
+macs/gen
+pcap/pcap_tester

vendor/github.com/google/gopacket/.travis.gofmt.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+
+cd "$(dirname $0)"
+if [ -n "$(go fmt ./...)" ]; then
+  echo "Go code is not formatted, run 'go fmt github.com/google/stenographer/...'" >&2
+  exit 1
+fi

vendor/github.com/google/gopacket/.travis.golint.sh

@@ -0,0 +1,28 @@
+#!/bin/bash
+
+cd "$(dirname $0)"
+
+go get golang.org/x/lint/golint
+DIRS=". tcpassembly tcpassembly/tcpreader ip4defrag reassembly macs pcapgo pcap afpacket pfring routing defrag/lcmdefrag"
+# Add subdirectories here as we clean up golint on each.
+for subdir in $DIRS; do
+  pushd $subdir
+  if golint |
+      grep -v CannotSetRFMon |  # pcap exported error name
+      grep -v DataLost |        # tcpassembly/tcpreader exported error name
+      grep .; then
+    exit 1
+  fi
+  popd
+done
+
+pushd layers
+for file in *.go; do
+  if cat .lint_blacklist | grep -q $file; then
+    echo "Skipping lint of $file due to .lint_blacklist"
+  elif golint $file | grep .; then
+    echo "Lint error in file $file"
+    exit 1
+  fi
+done
+popd

vendor/github.com/google/gopacket/.travis.govet.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+
+cd "$(dirname $0)"
+DIRS=". layers pcap pcapgo tcpassembly tcpassembly/tcpreader routing ip4defrag bytediff macs defrag/lcmdefrag"
+set -e
+for subdir in $DIRS; do
+  pushd $subdir
+  go vet
+  popd
+done

vendor/github.com/google/gopacket/.travis.install.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+set -ev
+
+go get github.com/google/gopacket
+go get github.com/google/gopacket/layers
+go get github.com/google/gopacket/tcpassembly
+go get github.com/google/gopacket/reassembly
+go get github.com/google/gopacket/pcapgo

vendor/github.com/google/gopacket/.travis.script.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+
+set -ev
+
+go test github.com/google/gopacket
+go test github.com/google/gopacket/layers
+go test github.com/google/gopacket/tcpassembly
+go test github.com/google/gopacket/reassembly
+go test github.com/google/gopacket/pcapgo 
+go test github.com/google/gopacket/pcap

vendor/github.com/google/gopacket/.travis.yml

@@ -0,0 +1,57 @@
+language: go
+go:
+ - 1.11.x
+ - 1.12.x
+ - 1.13.x
+ - master
+
+addons:
+  apt:
+    packages:
+      libpcap-dev
+
+# use modules except for older versions (see below)
+install: true
+
+env:
+  - GO111MODULE=on
+
+script: ./.travis.script.sh
+
+matrix:
+  fast_finish: true
+  allow_failures:
+    - go: master
+
+jobs:
+  include:
+    - go: 1.5.x
+      install: ./.travis.install.sh
+    - go: 1.6.x
+      install: ./.travis.install.sh
+    - go: 1.7.x
+      install: ./.travis.install.sh
+    - go: 1.8.x
+      install: ./.travis.install.sh
+    - go: 1.9.x
+      install: ./.travis.install.sh
+    - go: 1.10.x
+      install: ./.travis.install.sh
+    - os: osx
+      go: 1.x
+# windows doesn't work on travis (package installation just hangs and then errors out)
+#    - os: windows
+#      go: 1.x
+#      # We don't need nmap - but that's the only way to get npcap:
+#      before_install: choco install npcap --version 0.86 -y
+    - stage: style
+      name: "fmt/vet/lint"
+      go: 1.x
+      script:
+        - ./.travis.gofmt.sh
+        - ./.travis.govet.sh
+        - ./.travis.golint.sh
+
+stages:
+  - style
+  - test

vendor/github.com/google/gopacket/AUTHORS

@@ -0,0 +1,54 @@
+AUTHORS AND MAINTAINERS:
+
+MAIN DEVELOPERS:
+Graeme Connell   <gconnell@google.com, gsconnell@gmail.com>
+
+AUTHORS:
+Nigel Tao <nigeltao@google.com>
+Cole Mickens <cole.mickens@gmail.com>
+Ben Daglish <bdaglish@restorepoint.com>
+Luis Martinez <martinezlc99@gmail.com>
+Remco Verhoef <remco@dutchcoders.io>
+Hiroaki Kawai <Hiroaki.Kawai@gmail.com>
+Lukas Lueg <lukas.lueg@gmail.com>
+Laurent Hausermann <laurent.hausermann@gmail.com>
+Bill Green <bgreen@newrelic.com>
+Christian Mäder <christian.maeder@nine.ch>
+Gernot Vormayr <gvormayr@gmail.com>
+Vitor Garcia Graveto <victor.graveto@gmail.com>
+Elias Chavarria Reyes <elchavar@cisco.com>
+Daniel Rittweiler <ripx80@protonmail.com>
+
+CONTRIBUTORS:
+Attila Oláh <attila@attilaolah.eu>
+Vittus Mikiassen <matt.miki.vimik@gmail.com>
+Matthias Radestock <matthias.radestock@gmail.com>
+Matthew Sackman <matthew@wellquite.org>
+Loic Prylli <loicp@google.com>
+Alexandre Fiori <fiorix@gmail.com>
+Adrian Tam <adrian.c.m.tam@gmail.com>
+Satoshi Matsumoto <kaorimatz@gmail.com>
+David Stainton <dstainton415@gmail.com>
+Jesse Ward <jesse@jesseward.com>
+Kane Mathers <kane@kanemathers.name>
+Jose Selvi <jselvi@pentester.es>
+Yerden Zhumabekov <yerden.zhumabekov@gmail.com>
+Jensen Hwa <jensenhwa@gmail.com>
+
+-----------------------------------------------
+FORKED FROM github.com/akrennmair/gopcap
+ALL THE FOLLOWING ARE FOR THAT PROJECT
+
+MAIN DEVELOPERS:
+Andreas Krennmair <ak@synflood.at>
+
+CONTRIBUTORS:
+Andrea Nall <anall@andreanall.com>
+Daniel Arndt <danielarndt@gmail.com>
+Dustin Sallings <dustin@spy.net>
+Graeme Connell <gconnell@google.com, gsconnell@gmail.com>
+Guillaume Savary <guillaume@savary.name>
+Mark Smith <mark@qq.is>
+Miek Gieben <miek@miek.nl>
+Mike Bell <mike@mikebell.org>
+Trevor Strohman <strohman@google.com>

vendor/github.com/google/gopacket/CONTRIBUTING.md

@@ -0,0 +1,215 @@
+Contributing To gopacket
+========================
+
+So you've got some code and you'd like it to be part of gopacket... wonderful!
+We're happy to accept contributions, whether they're fixes to old protocols, new
+protocols entirely, or anything else you think would improve the gopacket
+library.  This document is designed to help you to do just that.
+
+The first section deals with the plumbing:  how to actually get a change
+submitted.
+
+The second section deals with coding style... Go is great in that it
+has a uniform style implemented by 'go fmt', but there's still some decisions
+we've made that go above and beyond, and if you follow them, they won't come up
+in your code review.
+
+The third section deals with some of the implementation decisions we've made,
+which may help you to understand the current code and which we may ask you to
+conform to (or provide compelling reasons for ignoring).
+
+Overall, we hope this document will help you to understand our system and write
+great code which fits in, and help us to turn around on your code review quickly
+so the code can make it into the master branch as quickly as possible.
+
+
+How To Submit Code
+------------------
+
+We use github.com's Pull Request feature to receive code contributions from
+external contributors.  See
+https://help.github.com/articles/creating-a-pull-request/ for details on
+how to create a request.
+
+Also, there's a local script `gc` in the base directory of GoPacket that
+runs a local set of checks, which should give you relatively high confidence
+that your pull won't fail github pull checks.
+
+```sh
+go get github.com/google/gopacket
+cd $GOROOT/src/pkg/github.com/google/gopacket
+git checkout -b <mynewfeature>  # create a new branch to work from
+... code code code ...
+./gc  # Run this to do local commits, it performs a number of checks
+```
+
+To sum up:
+
+* DO
+    + Pull down the latest version.
+    + Make a feature-specific branch.
+    + Code using the style and methods discussed in the rest of this document.
+    + Use the ./gc command to do local commits or check correctness.
+    + Push your new feature branch up to github.com, as a pull request.
+    + Handle comments and requests from reviewers, pushing new commits up to
+      your feature branch as problems are addressed.
+    + Put interesting comments and discussions into commit comments.
+* DON'T
+    + Push to someone else's branch without their permission.
+
+
+Coding Style
+------------
+
+* Go code must be run through `go fmt`, `go vet`, and `golint`
+* Follow http://golang.org/doc/effective_go.html as much as possible.
+    + In particular, http://golang.org/doc/effective_go.html#mixed-caps.  Enums
+      should be be CamelCase, with acronyms capitalized (TCPSourcePort, vs.
+      TcpSourcePort or TCP_SOURCE_PORT).
+* Bonus points for giving enum types a String() field.
+* Any exported types or functions should have commentary
+  (http://golang.org/doc/effective_go.html#commentary)
+
+
+Coding Methods And Implementation Notes
+---------------------------------------
+
+### Error Handling
+
+Many times, you'll be decoding a protocol and run across something bad, a packet
+corruption or the like.  How do you handle this?  First off, ALWAYS report the
+error.  You can do this either by returning the error from the decode() function
+(most common), or if you're up for it you can implement and add an ErrorLayer
+through the packet builder (the first method is a simple shortcut that does
+exactly this, then stops any future decoding).
+
+Often, you'll already have decode some part of your protocol by the time you hit
+your error.  Use your own discretion to determine whether the stuff you've
+already decoded should be returned to the caller or not:
+
+```go
+func decodeMyProtocol(data []byte, p gopacket.PacketBuilder) error {
+  prot := &MyProtocol{}
+  if len(data) < 10 {
+    // This error occurred before we did ANYTHING, so there's nothing in my
+    // protocol that the caller could possibly want.  Just return the error.
+    return fmt.Errorf("Length %d less than 10", len(data))
+  }
+  prot.ImportantField1 = data[:5]
+  prot.ImportantField2 = data[5:10]
+  // At this point, we've already got enough information in 'prot' to
+  // warrant returning it to the caller, so we'll add it now.
+  p.AddLayer(prot)
+  if len(data) < 15 {
+    // We encountered an error later in the packet, but the caller already
+    // has the important info we've gleaned so far.
+    return fmt.Errorf("Length %d less than 15", len(data))
+  }
+  prot.ImportantField3 = data[10:15]
+  return nil  // We've already added the layer, we can just return success.
+}
+```
+
+In general, our code follows the approach of returning the first error it
+encounters.  In general, we don't trust any bytes after the first error we see.
+
+### What Is A Layer?
+
+The definition of a layer is up to the discretion of the coder.  It should be
+something important enough that it's actually useful to the caller (IE: every
+TLV value should probably NOT be a layer).  However, it can be more granular
+than a single protocol... IPv6 and SCTP both implement many layers to handle the
+various parts of the protocol.  Use your best judgement, and prepare to defend
+your decisions during code review. ;)
+
+### Performance
+
+We strive to make gopacket as fast as possible while still providing lots of
+features.  In general, this means:
+
+* Focus performance tuning on common protocols (IP4/6, TCP, etc), and optimize
+  others on an as-needed basis (tons of MPLS on your network?  Time to optimize
+  MPLS!)
+* Use fast operations.  See the toplevel benchmark_test for benchmarks of some
+  of Go's underlying features and types.
+* Test your performance changes!  You should use the ./gc script's --benchmark
+  flag to submit any performance-related changes.  Use pcap/gopacket_benchmark
+  to test your change against a PCAP file based on your traffic patterns.
+* Don't be TOO hacky.  Sometimes, removing an unused struct from a field causes
+  a huge performance hit, due to the way that Go currently handles its segmented
+  stack... don't be afraid to clean it up anyway.  We'll trust the Go compiler
+  to get good enough over time to handle this.  Also, this type of
+  compiler-specific optimization is very fragile; someone adding a field to an
+  entirely different struct elsewhere in the codebase could reverse any gains
+  you might achieve by aligning your allocations.
+* Try to minimize memory allocations.  If possible, use []byte to reference
+  pieces of the input, instead of using string, which requires copying the bytes
+  into a new memory allocation.
+* Think hard about what should be evaluated lazily vs. not.  In general, a
+  layer's struct should almost exactly mirror the layer's frame.  Anything
+  that's more interesting should be a function.  This may not always be
+  possible, but it's a good rule of thumb.
+* Don't fear micro-optimizations.  With the above in mind, we welcome
+  micro-optimizations that we think will have positive/neutral impacts on the
+  majority of workloads.  A prime example of this is pre-allocating certain
+  structs within a larger one:
+
+```go
+type MyProtocol struct {
+  // Most packets have 1-4 of VeryCommon, so we preallocate it here.
+  initialAllocation [4]uint32
+  VeryCommon []uint32
+}
+
+func decodeMyProtocol(data []byte, p gopacket.PacketBuilder) error {
+  prot := &MyProtocol{}
+  prot.VeryCommon = proto.initialAllocation[:0]
+  for len(data) > 4 {
+    field := binary.BigEndian.Uint32(data[:4])
+    data = data[4:]
+    // Since we're using the underlying initialAllocation, we won't need to
+    // allocate new memory for the following append unless we more than 16
+    // bytes of data, which should be the uncommon case.
+    prot.VeryCommon = append(prot.VeryCommon, field)
+  }
+  p.AddLayer(prot)
+  if len(data) > 0 {
+    return fmt.Errorf("MyProtocol packet has %d bytes left after decoding", len(data))
+  }
+  return nil
+}
+```
+
+### Slices And Data
+
+If you're pulling a slice from the data you're decoding, don't copy it.  Just
+use the slice itself.
+
+```go
+type MyProtocol struct {
+  A, B net.IP
+}
+func decodeMyProtocol(data []byte, p gopacket.PacketBuilder) error {
+  p.AddLayer(&MyProtocol{
+    A: data[:4],
+    B: data[4:8],
+  })
+  return nil
+}
+```
+
+The caller has already agreed, by using this library, that they won't modify the
+set of bytes they pass in to the decoder, or the library has already copied the
+set of bytes to a read-only location.  See DecodeOptions.NoCopy for more
+information.
+
+### Enums/Types
+
+If a protocol has an integer field (uint8, uint16, etc) with a couple of known
+values that mean something special, make it a type.  This allows us to do really
+nice things like adding a String() function to them, so we can more easily
+display those to users.  Check out layers/enums.go for one example, as well as
+layers/icmp.go for layer-specific enums.
+
+When naming things, try for descriptiveness over suscinctness.  For example,
+choose DNSResponseRecord over DNSRR.

vendor/github.com/google/gopacket/LICENSE

@@ -0,0 +1,28 @@
+Copyright (c) 2012 Google, Inc. All rights reserved.
+Copyright (c) 2009-2011 Andreas Krennmair. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+   * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+   * Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer
+in the documentation and/or other materials provided with the
+distribution.
+   * Neither the name of Andreas Krennmair, Google, nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

vendor/github.com/google/gopacket/README.md

@@ -0,0 +1,12 @@
+# GoPacket
+
+This library provides packet decoding capabilities for Go.
+See [godoc](https://godoc.org/github.com/google/gopacket) for more details.
+
+[![Build Status](https://travis-ci.org/google/gopacket.svg?branch=master)](https://travis-ci.org/google/gopacket)
+[![GoDoc](https://godoc.org/github.com/google/gopacket?status.svg)](https://godoc.org/github.com/google/gopacket)
+
+Minimum Go version required is 1.5 except for pcapgo/EthernetHandle, afpacket, and bsdbpf which need at least 1.9 due to x/sys/unix dependencies.
+
+Originally forked from the gopcap project written by Andreas
+Krennmair <ak@synflood.at> (http://github.com/akrennmair/gopcap).

vendor/github.com/google/gopacket/base.go

@@ -0,0 +1,178 @@
+// Copyright 2012 Google, Inc. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+package gopacket
+
+import (
+	"fmt"
+)
+
+// Layer represents a single decoded packet layer (using either the
+// OSI or TCP/IP definition of a layer).  When decoding, a packet's data is
+// broken up into a number of layers.  The caller may call LayerType() to
+// figure out which type of layer they've received from the packet.  Optionally,
+// they may then use a type assertion to get the actual layer type for deep
+// inspection of the data.
+type Layer interface {
+	// LayerType is the gopacket type for this layer.
+	LayerType() LayerType
+	// LayerContents returns the set of bytes that make up this layer.
+	LayerContents() []byte
+	// LayerPayload returns the set of bytes contained within this layer, not
+	// including the layer itself.
+	LayerPayload() []byte
+}
+
+// Payload is a Layer containing the payload of a packet.  The definition of
+// what constitutes the payload of a packet depends on previous layers; for
+// TCP and UDP, we stop decoding above layer 4 and return the remaining
+// bytes as a Payload.  Payload is an ApplicationLayer.
+type Payload []byte
+
+// LayerType returns LayerTypePayload
+func (p Payload) LayerType() LayerType { return LayerTypePayload }
+
+// LayerContents returns the bytes making up this layer.
+func (p Payload) LayerContents() []byte { return []byte(p) }
+
+// LayerPayload returns the payload within this layer.
+func (p Payload) LayerPayload() []byte { return nil }
+
+// Payload returns this layer as bytes.
+func (p Payload) Payload() []byte { return []byte(p) }
+
+// String implements fmt.Stringer.
+func (p Payload) String() string { return fmt.Sprintf("%d byte(s)", len(p)) }
+
+// GoString implements fmt.GoStringer.
+func (p Payload) GoString() string { return LongBytesGoString([]byte(p)) }
+
+// CanDecode implements DecodingLayer.
+func (p Payload) CanDecode() LayerClass { return LayerTypePayload }
+
+// NextLayerType implements DecodingLayer.
+func (p Payload) NextLayerType() LayerType { return LayerTypeZero }
+
+// DecodeFromBytes implements DecodingLayer.
+func (p *Payload) DecodeFromBytes(data []byte, df DecodeFeedback) error {
+	*p = Payload(data)
+	return nil
+}
+
+// SerializeTo writes the serialized form of this layer into the
+// SerializationBuffer, implementing gopacket.SerializableLayer.
+// See the docs for gopacket.SerializableLayer for more info.
+func (p Payload) SerializeTo(b SerializeBuffer, opts SerializeOptions) error {
+	bytes, err := b.PrependBytes(len(p))
+	if err != nil {
+		return err
+	}
+	copy(bytes, p)
+	return nil
+}
+
+// decodePayload decodes data by returning it all in a Payload layer.
+func decodePayload(data []byte, p PacketBuilder) error {
+	payload := &Payload{}
+	if err := payload.DecodeFromBytes(data, p); err != nil {
+		return err
+	}
+	p.AddLayer(payload)
+	p.SetApplicationLayer(payload)
+	return nil
+}
+
+// Fragment is a Layer containing a fragment of a larger frame, used by layers
+// like IPv4 and IPv6 that allow for fragmentation of their payloads.
+type Fragment []byte
+
+// LayerType returns LayerTypeFragment
+func (p *Fragment) LayerType() LayerType { return LayerTypeFragment }
+
+// LayerContents implements Layer.
+func (p *Fragment) LayerContents() []byte { return []byte(*p) }
+
+// LayerPayload implements Layer.
+func (p *Fragment) LayerPayload() []byte { return nil }
+
+// Payload returns this layer as a byte slice.
+func (p *Fragment) Payload() []byte { return []byte(*p) }
+
+// String implements fmt.Stringer.
+func (p *Fragment) String() string { return fmt.Sprintf("%d byte(s)", len(*p)) }
+
+// CanDecode implements DecodingLayer.
+func (p *Fragment) CanDecode() LayerClass { return LayerTypeFragment }
+
+// NextLayerType implements DecodingLayer.
+func (p *Fragment) NextLayerType() LayerType { return LayerTypeZero }
+
+// DecodeFromBytes implements DecodingLayer.
+func (p *Fragment) DecodeFromBytes(data []byte, df DecodeFeedback) error {
+	*p = Fragment(data)
+	return nil
+}
+
+// SerializeTo writes the serialized form of this layer into the
+// SerializationBuffer, implementing gopacket.SerializableLayer.
+// See the docs for gopacket.SerializableLayer for more info.
+func (p *Fragment) SerializeTo(b SerializeBuffer, opts SerializeOptions) error {
+	bytes, err := b.PrependBytes(len(*p))
+	if err != nil {
+		return err
+	}
+	copy(bytes, *p)
+	return nil
+}
+
+// decodeFragment decodes data by returning it all in a Fragment layer.
+func decodeFragment(data []byte, p PacketBuilder) error {
+	payload := &Fragment{}
+	if err := payload.DecodeFromBytes(data, p); err != nil {
+		return err
+	}
+	p.AddLayer(payload)
+	p.SetApplicationLayer(payload)
+	return nil
+}
+
+// These layers correspond to Internet Protocol Suite (TCP/IP) layers, and their
+// corresponding OSI layers, as best as possible.
+
+// LinkLayer is the packet layer corresponding to TCP/IP layer 1 (OSI layer 2)
+type LinkLayer interface {
+	Layer
+	LinkFlow() Flow
+}
+
+// NetworkLayer is the packet layer corresponding to TCP/IP layer 2 (OSI
+// layer 3)
+type NetworkLayer interface {
+	Layer
+	NetworkFlow() Flow
+}
+
+// TransportLayer is the packet layer corresponding to the TCP/IP layer 3 (OSI
+// layer 4)
+type TransportLayer interface {
+	Layer
+	TransportFlow() Flow
+}
+
+// ApplicationLayer is the packet layer corresponding to the TCP/IP layer 4 (OSI
+// layer 7), also known as the packet payload.
+type ApplicationLayer interface {
+	Layer
+	Payload() []byte
+}
+
+// ErrorLayer is a packet layer created when decoding of the packet has failed.
+// Its payload is all the bytes that we were unable to decode, and the returned
+// error details why the decoding failed.
+type ErrorLayer interface {
+	Layer
+	Error() error
+}

vendor/github.com/google/gopacket/decode.go

@@ -0,0 +1,157 @@
+// Copyright 2012 Google, Inc. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+package gopacket
+
+import (
+	"errors"
+)
+
+// DecodeFeedback is used by DecodingLayer layers to provide decoding metadata.
+type DecodeFeedback interface {
+	// SetTruncated should be called if during decoding you notice that a packet
+	// is shorter than internal layer variables (HeaderLength, or the like) say it
+	// should be.  It sets packet.Metadata().Truncated.
+	SetTruncated()
+}
+
+type nilDecodeFeedback struct{}
+
+func (nilDecodeFeedback) SetTruncated() {}
+
+// NilDecodeFeedback implements DecodeFeedback by doing nothing.
+var NilDecodeFeedback DecodeFeedback = nilDecodeFeedback{}
+
+// PacketBuilder is used by layer decoders to store the layers they've decoded,
+// and to defer future decoding via NextDecoder.
+// Typically, the pattern for use is:
+//  func (m *myDecoder) Decode(data []byte, p PacketBuilder) error {
+//    if myLayer, err := myDecodingLogic(data); err != nil {
+//      return err
+//    } else {
+//      p.AddLayer(myLayer)
+//    }
+//    // maybe do this, if myLayer is a LinkLayer
+//    p.SetLinkLayer(myLayer)
+//    return p.NextDecoder(nextDecoder)
+//  }
+type PacketBuilder interface {
+	DecodeFeedback
+	// AddLayer should be called by a decoder immediately upon successful
+	// decoding of a layer.
+	AddLayer(l Layer)
+	// The following functions set the various specific layers in the final
+	// packet.  Note that if many layers call SetX, the first call is kept and all
+	// other calls are ignored.
+	SetLinkLayer(LinkLayer)
+	SetNetworkLayer(NetworkLayer)
+	SetTransportLayer(TransportLayer)
+	SetApplicationLayer(ApplicationLayer)
+	SetErrorLayer(ErrorLayer)
+	// NextDecoder should be called by a decoder when they're done decoding a
+	// packet layer but not done with decoding the entire packet.  The next
+	// decoder will be called to decode the last AddLayer's LayerPayload.
+	// Because of this, NextDecoder must only be called once all other
+	// PacketBuilder calls have been made.  Set*Layer and AddLayer calls after
+	// NextDecoder calls will behave incorrectly.
+	NextDecoder(next Decoder) error
+	// DumpPacketData is used solely for decoding.  If you come across an error
+	// you need to diagnose while processing a packet, call this and your packet's
+	// data will be dumped to stderr so you can create a test.  This should never
+	// be called from a production decoder.
+	DumpPacketData()
+	// DecodeOptions returns the decode options
+	DecodeOptions() *DecodeOptions
+}
+
+// Decoder is an interface for logic to decode a packet layer.  Users may
+// implement a Decoder to handle their own strange packet types, or may use one
+// of the many decoders available in the 'layers' subpackage to decode things
+// for them.
+type Decoder interface {
+	// Decode decodes the bytes of a packet, sending decoded values and other
+	// information to PacketBuilder, and returning an error if unsuccessful.  See
+	// the PacketBuilder documentation for more details.
+	Decode([]byte, PacketBuilder) error
+}
+
+// DecodeFunc wraps a function to make it a Decoder.
+type DecodeFunc func([]byte, PacketBuilder) error
+
+// Decode implements Decoder by calling itself.
+func (d DecodeFunc) Decode(data []byte, p PacketBuilder) error {
+	// function, call thyself.
+	return d(data, p)
+}
+
+// DecodePayload is a Decoder that returns a Payload layer containing all
+// remaining bytes.
+var DecodePayload Decoder = DecodeFunc(decodePayload)
+
+// DecodeUnknown is a Decoder that returns an Unknown layer containing all
+// remaining bytes, useful if you run up against a layer that you're unable to
+// decode yet.  This layer is considered an ErrorLayer.
+var DecodeUnknown Decoder = DecodeFunc(decodeUnknown)
+
+// DecodeFragment is a Decoder that returns a Fragment layer containing all
+// remaining bytes.
+var DecodeFragment Decoder = DecodeFunc(decodeFragment)
+
+// LayerTypeZero is an invalid layer type, but can be used to determine whether
+// layer type has actually been set correctly.
+var LayerTypeZero = RegisterLayerType(0, LayerTypeMetadata{Name: "Unknown", Decoder: DecodeUnknown})
+
+// LayerTypeDecodeFailure is the layer type for the default error layer.
+var LayerTypeDecodeFailure = RegisterLayerType(1, LayerTypeMetadata{Name: "DecodeFailure", Decoder: DecodeUnknown})
+
+// LayerTypePayload is the layer type for a payload that we don't try to decode
+// but treat as a success, IE: an application-level payload.
+var LayerTypePayload = RegisterLayerType(2, LayerTypeMetadata{Name: "Payload", Decoder: DecodePayload})
+
+// LayerTypeFragment is the layer type for a fragment of a layer transported
+// by an underlying layer that supports fragmentation.
+var LayerTypeFragment = RegisterLayerType(3, LayerTypeMetadata{Name: "Fragment", Decoder: DecodeFragment})
+
+// DecodeFailure is a packet layer created if decoding of the packet data failed
+// for some reason.  It implements ErrorLayer.  LayerContents will be the entire
+// set of bytes that failed to parse, and Error will return the reason parsing
+// failed.
+type DecodeFailure struct {
+	data  []byte
+	err   error
+	stack []byte
+}
+
+// Error returns the error encountered during decoding.
+func (d *DecodeFailure) Error() error { return d.err }
+
+// LayerContents implements Layer.
+func (d *DecodeFailure) LayerContents() []byte { return d.data }
+
+// LayerPayload implements Layer.
+func (d *DecodeFailure) LayerPayload() []byte { return nil }
+
+// String implements fmt.Stringer.
+func (d *DecodeFailure) String() string {
+	return "Packet decoding error: " + d.Error().Error()
+}
+
+// Dump implements Dumper.
+func (d *DecodeFailure) Dump() (s string) {
+	if d.stack != nil {
+		s = string(d.stack)
+	}
+	return
+}
+
+// LayerType returns LayerTypeDecodeFailure
+func (d *DecodeFailure) LayerType() LayerType { return LayerTypeDecodeFailure }
+
+// decodeUnknown "decodes" unsupported data types by returning an error.
+// This decoder will thus always return a DecodeFailure layer.
+func decodeUnknown(data []byte, p PacketBuilder) error {
+	return errors.New("Layer type not currently supported")
+}

vendor/github.com/google/gopacket/doc.go

@@ -0,0 +1,432 @@
+// Copyright 2012 Google, Inc. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+/*
+Package gopacket provides packet decoding for the Go language.
+
+gopacket contains many sub-packages with additional functionality you may find
+useful, including:
+
+ * layers: You'll probably use this every time.  This contains of the logic
+     built into gopacket for decoding packet protocols.  Note that all example
+     code below assumes that you have imported both gopacket and
+     gopacket/layers.
+ * pcap: C bindings to use libpcap to read packets off the wire.
+ * pfring: C bindings to use PF_RING to read packets off the wire.
+ * afpacket: C bindings for Linux's AF_PACKET to read packets off the wire.
+ * tcpassembly: TCP stream reassembly
+
+Also, if you're looking to dive right into code, see the examples subdirectory
+for numerous simple binaries built using gopacket libraries.
+
+Minimum go version required is 1.5 except for pcapgo/EthernetHandle, afpacket,
+and bsdbpf which need at least 1.7 due to x/sys/unix dependencies.
+
+Basic Usage
+
+gopacket takes in packet data as a []byte and decodes it into a packet with
+a non-zero number of "layers".  Each layer corresponds to a protocol
+within the bytes.  Once a packet has been decoded, the layers of the packet
+can be requested from the packet.
+
+ // Decode a packet
+ packet := gopacket.NewPacket(myPacketData, layers.LayerTypeEthernet, gopacket.Default)
+ // Get the TCP layer from this packet
+ if tcpLayer := packet.Layer(layers.LayerTypeTCP); tcpLayer != nil {
+   fmt.Println("This is a TCP packet!")
+   // Get actual TCP data from this layer
+   tcp, _ := tcpLayer.(*layers.TCP)
+   fmt.Printf("From src port %d to dst port %d\n", tcp.SrcPort, tcp.DstPort)
+ }
+ // Iterate over all layers, printing out each layer type
+ for _, layer := range packet.Layers() {
+   fmt.Println("PACKET LAYER:", layer.LayerType())
+ }
+
+Packets can be decoded from a number of starting points.  Many of our base
+types implement Decoder, which allow us to decode packets for which
+we don't have full data.
+
+ // Decode an ethernet packet
+ ethP := gopacket.NewPacket(p1, layers.LayerTypeEthernet, gopacket.Default)
+ // Decode an IPv6 header and everything it contains
+ ipP := gopacket.NewPacket(p2, layers.LayerTypeIPv6, gopacket.Default)
+ // Decode a TCP header and its payload
+ tcpP := gopacket.NewPacket(p3, layers.LayerTypeTCP, gopacket.Default)
+
+
+Reading Packets From A Source
+
+Most of the time, you won't just have a []byte of packet data lying around.
+Instead, you'll want to read packets in from somewhere (file, interface, etc)
+and process them.  To do that, you'll want to build a PacketSource.
+
+First, you'll need to construct an object that implements the PacketDataSource
+interface.  There are implementations of this interface bundled with gopacket
+in the gopacket/pcap and gopacket/pfring subpackages... see their documentation
+for more information on their usage.  Once you have a PacketDataSource, you can
+pass it into NewPacketSource, along with a Decoder of your choice, to create
+a PacketSource.
+
+Once you have a PacketSource, you can read packets from it in multiple ways.
+See the docs for PacketSource for more details.  The easiest method is the
+Packets function, which returns a channel, then asynchronously writes new
+packets into that channel, closing the channel if the packetSource hits an
+end-of-file.
+
+  packetSource := ...  // construct using pcap or pfring
+  for packet := range packetSource.Packets() {
+    handlePacket(packet)  // do something with each packet
+  }
+
+You can change the decoding options of the packetSource by setting fields in
+packetSource.DecodeOptions... see the following sections for more details.
+
+
+Lazy Decoding
+
+gopacket optionally decodes packet data lazily, meaning it
+only decodes a packet layer when it needs to handle a function call.
+
+ // Create a packet, but don't actually decode anything yet
+ packet := gopacket.NewPacket(myPacketData, layers.LayerTypeEthernet, gopacket.Lazy)
+ // Now, decode the packet up to the first IPv4 layer found but no further.
+ // If no IPv4 layer was found, the whole packet will be decoded looking for
+ // it.
+ ip4 := packet.Layer(layers.LayerTypeIPv4)
+ // Decode all layers and return them.  The layers up to the first IPv4 layer
+ // are already decoded, and will not require decoding a second time.
+ layers := packet.Layers()
+
+Lazily-decoded packets are not concurrency-safe.  Since layers have not all been
+decoded, each call to Layer() or Layers() has the potential to mutate the packet
+in order to decode the next layer.  If a packet is used
+in multiple goroutines concurrently, don't use gopacket.Lazy.  Then gopacket
+will decode the packet fully, and all future function calls won't mutate the
+object.
+
+
+NoCopy Decoding
+
+By default, gopacket will copy the slice passed to NewPacket and store the
+copy within the packet, so future mutations to the bytes underlying the slice
+don't affect the packet and its layers.  If you can guarantee that the
+underlying slice bytes won't be changed, you can use NoCopy to tell
+gopacket.NewPacket, and it'll use the passed-in slice itself.
+
+ // This channel returns new byte slices, each of which points to a new
+ // memory location that's guaranteed immutable for the duration of the
+ // packet.
+ for data := range myByteSliceChannel {
+   p := gopacket.NewPacket(data, layers.LayerTypeEthernet, gopacket.NoCopy)
+   doSomethingWithPacket(p)
+ }
+
+The fastest method of decoding is to use both Lazy and NoCopy, but note from
+the many caveats above that for some implementations either or both may be
+dangerous.
+
+
+Pointers To Known Layers
+
+During decoding, certain layers are stored in the packet as well-known
+layer types.  For example, IPv4 and IPv6 are both considered NetworkLayer
+layers, while TCP and UDP are both TransportLayer layers.  We support 4
+layers, corresponding to the 4 layers of the TCP/IP layering scheme (roughly
+anagalous to layers 2, 3, 4, and 7 of the OSI model).  To access these,
+you can use the packet.LinkLayer, packet.NetworkLayer,
+packet.TransportLayer, and packet.ApplicationLayer functions.  Each of
+these functions returns a corresponding interface
+(gopacket.{Link,Network,Transport,Application}Layer).  The first three
+provide methods for getting src/dst addresses for that particular layer,
+while the final layer provides a Payload function to get payload data.
+This is helpful, for example, to get payloads for all packets regardless
+of their underlying data type:
+
+ // Get packets from some source
+ for packet := range someSource {
+   if app := packet.ApplicationLayer(); app != nil {
+     if strings.Contains(string(app.Payload()), "magic string") {
+       fmt.Println("Found magic string in a packet!")
+     }
+   }
+ }
+
+A particularly useful layer is ErrorLayer, which is set whenever there's
+an error parsing part of the packet.
+
+ packet := gopacket.NewPacket(myPacketData, layers.LayerTypeEthernet, gopacket.Default)
+ if err := packet.ErrorLayer(); err != nil {
+   fmt.Println("Error decoding some part of the packet:", err)
+ }
+
+Note that we don't return an error from NewPacket because we may have decoded
+a number of layers successfully before running into our erroneous layer.  You
+may still be able to get your Ethernet and IPv4 layers correctly, even if
+your TCP layer is malformed.
+
+
+Flow And Endpoint
+
+gopacket has two useful objects, Flow and Endpoint, for communicating in a protocol
+independent manner the fact that a packet is coming from A and going to B.
+The general layer types LinkLayer, NetworkLayer, and TransportLayer all provide
+methods for extracting their flow information, without worrying about the type
+of the underlying Layer.
+
+A Flow is a simple object made up of a set of two Endpoints, one source and one
+destination.  It details the sender and receiver of the Layer of the Packet.
+
+An Endpoint is a hashable representation of a source or destination.  For
+example, for LayerTypeIPv4, an Endpoint contains the IP address bytes for a v4
+IP packet.  A Flow can be broken into Endpoints, and Endpoints can be combined
+into Flows:
+
+ packet := gopacket.NewPacket(myPacketData, layers.LayerTypeEthernet, gopacket.Lazy)
+ netFlow := packet.NetworkLayer().NetworkFlow()
+ src, dst := netFlow.Endpoints()
+ reverseFlow := gopacket.NewFlow(dst, src)
+
+Both Endpoint and Flow objects can be used as map keys, and the equality
+operator can compare them, so you can easily group together all packets
+based on endpoint criteria:
+
+ flows := map[gopacket.Endpoint]chan gopacket.Packet
+ packet := gopacket.NewPacket(myPacketData, layers.LayerTypeEthernet, gopacket.Lazy)
+ // Send all TCP packets to channels based on their destination port.
+ if tcp := packet.Layer(layers.LayerTypeTCP); tcp != nil {
+   flows[tcp.TransportFlow().Dst()] <- packet
+ }
+ // Look for all packets with the same source and destination network address
+ if net := packet.NetworkLayer(); net != nil {
+   src, dst := net.NetworkFlow().Endpoints()
+   if src == dst {
+     fmt.Println("Fishy packet has same network source and dst: %s", src)
+   }
+ }
+ // Find all packets coming from UDP port 1000 to UDP port 500
+ interestingFlow := gopacket.FlowFromEndpoints(layers.NewUDPPortEndpoint(1000), layers.NewUDPPortEndpoint(500))
+ if t := packet.NetworkLayer(); t != nil && t.TransportFlow() == interestingFlow {
+   fmt.Println("Found that UDP flow I was looking for!")
+ }
+
+For load-balancing purposes, both Flow and Endpoint have FastHash() functions,
+which provide quick, non-cryptographic hashes of their contents.  Of particular
+importance is the fact that Flow FastHash() is symmetric: A->B will have the same
+hash as B->A.  An example usage could be:
+
+ channels := [8]chan gopacket.Packet
+ for i := 0; i < 8; i++ {
+   channels[i] = make(chan gopacket.Packet)
+   go packetHandler(channels[i])
+ }
+ for packet := range getPackets() {
+   if net := packet.NetworkLayer(); net != nil {
+     channels[int(net.NetworkFlow().FastHash()) & 0x7] <- packet
+   }
+ }
+
+This allows us to split up a packet stream while still making sure that each
+stream sees all packets for a flow (and its bidirectional opposite).
+
+
+Implementing Your Own Decoder
+
+If your network has some strange encapsulation, you can implement your own
+decoder.  In this example, we handle Ethernet packets which are encapsulated
+in a 4-byte header.
+
+ // Create a layer type, should be unique and high, so it doesn't conflict,
+ // giving it a name and a decoder to use.
+ var MyLayerType = gopacket.RegisterLayerType(12345, gopacket.LayerTypeMetadata{Name: "MyLayerType", Decoder: gopacket.DecodeFunc(decodeMyLayer)})
+
+ // Implement my layer
+ type MyLayer struct {
+   StrangeHeader []byte
+   payload []byte
+ }
+ func (m MyLayer) LayerType() gopacket.LayerType { return MyLayerType }
+ func (m MyLayer) LayerContents() []byte { return m.StrangeHeader }
+ func (m MyLayer) LayerPayload() []byte { return m.payload }
+
+ // Now implement a decoder... this one strips off the first 4 bytes of the
+ // packet.
+ func decodeMyLayer(data []byte, p gopacket.PacketBuilder) error {
+   // Create my layer
+   p.AddLayer(&MyLayer{data[:4], data[4:]})
+   // Determine how to handle the rest of the packet
+   return p.NextDecoder(layers.LayerTypeEthernet)
+ }
+
+ // Finally, decode your packets:
+ p := gopacket.NewPacket(data, MyLayerType, gopacket.Lazy)
+
+See the docs for Decoder and PacketBuilder for more details on how coding
+decoders works, or look at RegisterLayerType and RegisterEndpointType to see how
+to add layer/endpoint types to gopacket.
+
+
+Fast Decoding With DecodingLayerParser
+
+TLDR:  DecodingLayerParser takes about 10% of the time as NewPacket to decode
+packet data, but only for known packet stacks.
+
+Basic decoding using gopacket.NewPacket or PacketSource.Packets is somewhat slow
+due to its need to allocate a new packet and every respective layer.  It's very
+versatile and can handle all known layer types, but sometimes you really only
+care about a specific set of layers regardless, so that versatility is wasted.
+
+DecodingLayerParser avoids memory allocation altogether by decoding packet
+layers directly into preallocated objects, which you can then reference to get
+the packet's information.  A quick example:
+
+ func main() {
+   var eth layers.Ethernet
+   var ip4 layers.IPv4
+   var ip6 layers.IPv6
+   var tcp layers.TCP
+   parser := gopacket.NewDecodingLayerParser(layers.LayerTypeEthernet, &eth, &ip4, &ip6, &tcp)
+   decoded := []gopacket.LayerType{}
+   for packetData := range somehowGetPacketData() {
+     if err := parser.DecodeLayers(packetData, &decoded); err != nil {
+       fmt.Fprintf(os.Stderr, "Could not decode layers: %v\n", err)
+       continue
+     }
+     for _, layerType := range decoded {
+       switch layerType {
+         case layers.LayerTypeIPv6:
+           fmt.Println("    IP6 ", ip6.SrcIP, ip6.DstIP)
+         case layers.LayerTypeIPv4:
+           fmt.Println("    IP4 ", ip4.SrcIP, ip4.DstIP)
+       }
+     }
+   }
+ }
+
+The important thing to note here is that the parser is modifying the passed in
+layers (eth, ip4, ip6, tcp) instead of allocating new ones, thus greatly
+speeding up the decoding process.  It's even branching based on layer type...
+it'll handle an (eth, ip4, tcp) or (eth, ip6, tcp) stack.  However, it won't
+handle any other type... since no other decoders were passed in, an (eth, ip4,
+udp) stack will stop decoding after ip4, and only pass back [LayerTypeEthernet,
+LayerTypeIPv4] through the 'decoded' slice (along with an error saying it can't
+decode a UDP packet).
+
+Unfortunately, not all layers can be used by DecodingLayerParser... only those
+implementing the DecodingLayer interface are usable.  Also, it's possible to
+create DecodingLayers that are not themselves Layers... see
+layers.IPv6ExtensionSkipper for an example of this.
+
+Faster And Customized Decoding with DecodingLayerContainer
+
+By default, DecodingLayerParser uses native map to store and search for a layer
+to decode. Though being versatile, in some cases this solution may be not so
+optimal. For example, if you have only few layers faster operations may be
+provided by sparse array indexing or linear array scan.
+
+To accomodate these scenarios, DecodingLayerContainer interface is introduced
+along with its implementations: DecodingLayerSparse, DecodingLayerArray and
+DecodingLayerMap. You can specify a container implementation to
+DecodingLayerParser with SetDecodingLayerContainer method. Example:
+
+ dlp := gopacket.NewDecodingLayerParser(LayerTypeEthernet)
+ dlp.SetDecodingLayerContainer(gopacket.DecodingLayerSparse(nil))
+ var eth layers.Ethernet
+ dlp.AddDecodingLayer(&eth)
+ // ... add layers and use DecodingLayerParser as usual...
+
+To skip one level of indirection (though sacrificing some capabilities) you may
+also use DecodingLayerContainer as a decoding tool as it is. In this case you have to
+handle unknown layer types and layer panics by yourself. Example:
+
+ func main() {
+   var eth layers.Ethernet
+   var ip4 layers.IPv4
+   var ip6 layers.IPv6
+   var tcp layers.TCP
+   dlc := gopacket.DecodingLayerContainer(gopacket.DecodingLayerArray(nil))
+   dlc = dlc.Put(&eth)
+   dlc = dlc.Put(&ip4)
+   dlc = dlc.Put(&ip6)
+   dlc = dlc.Put(&tcp)
+   // you may specify some meaningful DecodeFeedback
+   decoder := dlc.LayersDecoder(LayerTypeEthernet, gopacket.NilDecodeFeedback)
+   decoded := make([]gopacket.LayerType, 0, 20)
+   for packetData := range somehowGetPacketData() {
+     lt, err := decoder(packetData, &decoded)
+     if err != nil {
+       fmt.Fprintf(os.Stderr, "Could not decode layers: %v\n", err)
+       continue
+     }
+     if lt != gopacket.LayerTypeZero {
+       fmt.Fprintf(os.Stderr, "unknown layer type: %v\n", lt)
+       continue
+     }
+     for _, layerType := range decoded {
+       // examine decoded layertypes just as already shown above
+     }
+   }
+ }
+
+DecodingLayerSparse is the fastest but most effective when LayerType values
+that layers in use can decode are not large because otherwise that would lead
+to bigger memory footprint. DecodingLayerArray is very compact and primarily
+usable if the number of decoding layers is not big (up to ~10-15, but please do
+your own benchmarks). DecodingLayerMap is the most versatile one and used by
+DecodingLayerParser by default. Please refer to tests and benchmarks in layers
+subpackage to further examine usage examples and performance measurements.
+
+You may also choose to implement your own DecodingLayerContainer if you want to
+make use of your own internal packet decoding logic.
+
+Creating Packet Data
+
+As well as offering the ability to decode packet data, gopacket will allow you
+to create packets from scratch, as well.  A number of gopacket layers implement
+the SerializableLayer interface; these layers can be serialized to a []byte in
+the following manner:
+
+  ip := &layers.IPv4{
+    SrcIP: net.IP{1, 2, 3, 4},
+    DstIP: net.IP{5, 6, 7, 8},
+    // etc...
+  }
+  buf := gopacket.NewSerializeBuffer()
+  opts := gopacket.SerializeOptions{}  // See SerializeOptions for more details.
+  err := ip.SerializeTo(buf, opts)
+  if err != nil { panic(err) }
+  fmt.Println(buf.Bytes())  // prints out a byte slice containing the serialized IPv4 layer.
+
+SerializeTo PREPENDS the given layer onto the SerializeBuffer, and they treat
+the current buffer's Bytes() slice as the payload of the serializing layer.
+Therefore, you can serialize an entire packet by serializing a set of layers in
+reverse order (Payload, then TCP, then IP, then Ethernet, for example).  The
+SerializeBuffer's SerializeLayers function is a helper that does exactly that.
+
+To generate a (empty and useless, because no fields are set)
+Ethernet(IPv4(TCP(Payload))) packet, for example, you can run:
+
+  buf := gopacket.NewSerializeBuffer()
+  opts := gopacket.SerializeOptions{}
+  gopacket.SerializeLayers(buf, opts,
+    &layers.Ethernet{},
+    &layers.IPv4{},
+    &layers.TCP{},
+    gopacket.Payload([]byte{1, 2, 3, 4}))
+  packetData := buf.Bytes()
+
+A Final Note
+
+If you use gopacket, you'll almost definitely want to make sure gopacket/layers
+is imported, since when imported it sets all the LayerType variables and fills
+in a lot of interesting variables/maps (DecodersByLayerName, etc).  Therefore,
+it's recommended that even if you don't use any layers functions directly, you still import with:
+
+  import (
+    _ "github.com/google/gopacket/layers"
+  )
+*/
+package gopacket

vendor/github.com/google/gopacket/flows.go

@@ -0,0 +1,236 @@
+// Copyright 2012 Google, Inc. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+package gopacket
+
+import (
+	"bytes"
+	"fmt"
+	"strconv"
+)
+
+// MaxEndpointSize determines the maximum size in bytes of an endpoint address.
+//
+// Endpoints/Flows have a problem:  They need to be hashable.  Therefore, they
+// can't use a byte slice.  The two obvious choices are to use a string or a
+// byte array.  Strings work great, but string creation requires memory
+// allocation, which can be slow.  Arrays work great, but have a fixed size.  We
+// originally used the former, now we've switched to the latter.  Use of a fixed
+// byte-array doubles the speed of constructing a flow (due to not needing to
+// allocate).  This is a huge increase... too much for us to pass up.
+//
+// The end result of this, though, is that an endpoint/flow can't be created
+// using more than MaxEndpointSize bytes per address.
+const MaxEndpointSize = 16
+
+// Endpoint is the set of bytes used to address packets at various layers.
+// See LinkLayer, NetworkLayer, and TransportLayer specifications.
+// Endpoints are usable as map keys.
+type Endpoint struct {
+	typ EndpointType
+	len int
+	raw [MaxEndpointSize]byte
+}
+
+// EndpointType returns the endpoint type associated with this endpoint.
+func (a Endpoint) EndpointType() EndpointType { return a.typ }
+
+// Raw returns the raw bytes of this endpoint.  These aren't human-readable
+// most of the time, but they are faster than calling String.
+func (a Endpoint) Raw() []byte { return a.raw[:a.len] }
+
+// LessThan provides a stable ordering for all endpoints.  It sorts first based
+// on the EndpointType of an endpoint, then based on the raw bytes of that
+// endpoint.
+//
+// For some endpoints, the actual comparison may not make sense, however this
+// ordering does provide useful information for most Endpoint types.
+// Ordering is based first on endpoint type, then on raw endpoint bytes.
+// Endpoint bytes are sorted lexicographically.
+func (a Endpoint) LessThan(b Endpoint) bool {
+	return a.typ < b.typ || (a.typ == b.typ && bytes.Compare(a.raw[:a.len], b.raw[:b.len]) < 0)
+}
+
+// fnvHash is used by our FastHash functions, and implements the FNV hash
+// created by Glenn Fowler, Landon Curt Noll, and Phong Vo.
+// See http://isthe.com/chongo/tech/comp/fnv/.
+func fnvHash(s []byte) (h uint64) {
+	h = fnvBasis
+	for i := 0; i < len(s); i++ {
+		h ^= uint64(s[i])
+		h *= fnvPrime
+	}
+	return
+}
+
+const fnvBasis = 14695981039346656037
+const fnvPrime = 1099511628211
+
+// FastHash provides a quick hashing function for an endpoint, useful if you'd
+// like to split up endpoints by modulos or other load-balancing techniques.
+// It uses a variant of Fowler-Noll-Vo hashing.
+//
+// The output of FastHash is not guaranteed to remain the same through future
+// code revisions, so should not be used to key values in persistent storage.
+func (a Endpoint) FastHash() (h uint64) {
+	h = fnvHash(a.raw[:a.len])
+	h ^= uint64(a.typ)
+	h *= fnvPrime
+	return
+}
+
+// NewEndpoint creates a new Endpoint object.
+//
+// The size of raw must be less than MaxEndpointSize, otherwise this function
+// will panic.
+func NewEndpoint(typ EndpointType, raw []byte) (e Endpoint) {
+	e.len = len(raw)
+	if e.len > MaxEndpointSize {
+		panic("raw byte length greater than MaxEndpointSize")
+	}
+	e.typ = typ
+	copy(e.raw[:], raw)
+	return
+}
+
+// EndpointTypeMetadata is used to register a new endpoint type.
+type EndpointTypeMetadata struct {
+	// Name is the string returned by an EndpointType's String function.
+	Name string
+	// Formatter is called from an Endpoint's String function to format the raw
+	// bytes in an Endpoint into a human-readable string.
+	Formatter func([]byte) string
+}
+
+// EndpointType is the type of a gopacket Endpoint.  This type determines how
+// the bytes stored in the endpoint should be interpreted.
+type EndpointType int64
+
+var endpointTypes = map[EndpointType]EndpointTypeMetadata{}
+
+// RegisterEndpointType creates a new EndpointType and registers it globally.
+// It MUST be passed a unique number, or it will panic.  Numbers 0-999 are
+// reserved for gopacket's use.
+func RegisterEndpointType(num int, meta EndpointTypeMetadata) EndpointType {
+	t := EndpointType(num)
+	if _, ok := endpointTypes[t]; ok {
+		panic("Endpoint type number already in use")
+	}
+	endpointTypes[t] = meta
+	return t
+}
+
+func (e EndpointType) String() string {
+	if t, ok := endpointTypes[e]; ok {
+		return t.Name
+	}
+	return strconv.Itoa(int(e))
+}
+
+func (a Endpoint) String() string {
+	if t, ok := endpointTypes[a.typ]; ok && t.Formatter != nil {
+		return t.Formatter(a.raw[:a.len])
+	}
+	return fmt.Sprintf("%v:%v", a.typ, a.raw)
+}
+
+// Flow represents the direction of traffic for a packet layer, as a source and destination Endpoint.
+// Flows are usable as map keys.
+type Flow struct {
+	typ        EndpointType
+	slen, dlen int
+	src, dst   [MaxEndpointSize]byte
+}
+
+// FlowFromEndpoints creates a new flow by pasting together two endpoints.
+// The endpoints must have the same EndpointType, or this function will return
+// an error.
+func FlowFromEndpoints(src, dst Endpoint) (_ Flow, err error) {
+	if src.typ != dst.typ {
+		err = fmt.Errorf("Mismatched endpoint types: %v->%v", src.typ, dst.typ)
+		return
+	}
+	return Flow{src.typ, src.len, dst.len, src.raw, dst.raw}, nil
+}
+
+// FastHash provides a quick hashing function for a flow, useful if you'd
+// like to split up flows by modulos or other load-balancing techniques.
+// It uses a variant of Fowler-Noll-Vo hashing, and is guaranteed to collide
+// with its reverse flow.  IE: the flow A->B will have the same hash as the flow
+// B->A.
+//
+// The output of FastHash is not guaranteed to remain the same through future
+// code revisions, so should not be used to key values in persistent storage.
+func (f Flow) FastHash() (h uint64) {
+	// This combination must be commutative.  We don't use ^, since that would
+	// give the same hash for all A->A flows.
+	h = fnvHash(f.src[:f.slen]) + fnvHash(f.dst[:f.dlen])
+	h ^= uint64(f.typ)
+	h *= fnvPrime
+	return
+}
+
+// String returns a human-readable representation of this flow, in the form
+// "Src->Dst"
+func (f Flow) String() string {
+	s, d := f.Endpoints()
+	return fmt.Sprintf("%v->%v", s, d)
+}
+
+// EndpointType returns the EndpointType for this Flow.
+func (f Flow) EndpointType() EndpointType {
+	return f.typ
+}
+
+// Endpoints returns the two Endpoints for this flow.
+func (f Flow) Endpoints() (src, dst Endpoint) {
+	return Endpoint{f.typ, f.slen, f.src}, Endpoint{f.typ, f.dlen, f.dst}
+}
+
+// Src returns the source Endpoint for this flow.
+func (f Flow) Src() (src Endpoint) {
+	src, _ = f.Endpoints()
+	return
+}
+
+// Dst returns the destination Endpoint for this flow.
+func (f Flow) Dst() (dst Endpoint) {
+	_, dst = f.Endpoints()
+	return
+}
+
+// Reverse returns a new flow with endpoints reversed.
+func (f Flow) Reverse() Flow {
+	return Flow{f.typ, f.dlen, f.slen, f.dst, f.src}
+}
+
+// NewFlow creates a new flow.
+//
+// src and dst must have length <= MaxEndpointSize, otherwise NewFlow will
+// panic.
+func NewFlow(t EndpointType, src, dst []byte) (f Flow) {
+	f.slen = len(src)
+	f.dlen = len(dst)
+	if f.slen > MaxEndpointSize || f.dlen > MaxEndpointSize {
+		panic("flow raw byte length greater than MaxEndpointSize")
+	}
+	f.typ = t
+	copy(f.src[:], src)
+	copy(f.dst[:], dst)
+	return
+}
+
+// EndpointInvalid is an endpoint type used for invalid endpoints, IE endpoints
+// that are specified incorrectly during creation.
+var EndpointInvalid = RegisterEndpointType(0, EndpointTypeMetadata{Name: "invalid", Formatter: func(b []byte) string {
+	return fmt.Sprintf("%v", b)
+}})
+
+// InvalidEndpoint is a singleton Endpoint of type EndpointInvalid.
+var InvalidEndpoint = NewEndpoint(EndpointInvalid, nil)
+
+// InvalidFlow is a singleton Flow of type EndpointInvalid.
+var InvalidFlow = NewFlow(EndpointInvalid, nil, nil)

vendor/github.com/google/gopacket/gc

@@ -0,0 +1,288 @@
+#!/bin/bash
+# Copyright 2012 Google, Inc. All rights reserved.
+
+# This script provides a simple way to run benchmarks against previous code and
+# keep a log of how benchmarks change over time.  When used with the --benchmark
+# flag, it runs benchmarks from the current code and from the last commit run
+# with --benchmark, then stores the results in the git commit description.  We
+# rerun the old benchmarks along with the new ones, since there's no guarantee
+# that git commits will happen on the same machine, so machine differences could
+# cause wildly inaccurate results.
+#
+# If you're making changes to 'gopacket' which could cause performance changes,
+# you may be requested to use this commit script to make sure your changes don't
+# have large detrimental effects (or to show off how awesome your performance
+# improvements are).
+#
+# If not run with the --benchmark flag, this script is still very useful... it
+# makes sure all the correct go formatting, building, and testing work as
+# expected.
+
+function Usage {
+  cat <<EOF
+USAGE:  $0 [--benchmark regexp] [--root] [--gen] <git commit flags...>
+
+--benchmark:  Run benchmark comparisons against last benchmark'd commit
+--root:  Run tests that require root priviledges
+--gen:  Generate code for MACs/ports by pulling down external data
+
+Note, some 'git commit' flags are necessary, if all else fails, pass in -a
+EOF
+  exit 1
+}
+
+BENCH=""
+GEN=""
+ROOT=""
+while [ ! -z "$1" ]; do
+  case "$1" in
+    "--benchmark")
+      BENCH="$2"
+      shift
+      shift
+      ;;
+    "--gen")
+      GEN="yes"
+      shift
+      ;;
+    "--root")
+      ROOT="yes"
+      shift
+      ;;
+    "--help")
+      Usage
+      ;;
+    "-h")
+      Usage
+      ;;
+    "help")
+      Usage
+      ;;
+    *)
+      break
+      ;;
+  esac
+done
+
+function Root {
+  if [ ! -z "$ROOT" ]; then
+    local exec="$1"
+    # Some folks (like me) keep source code in places inaccessible by root (like
+    # NFS), so to make sure things run smoothly we copy them to a /tmp location.
+    local tmpfile="$(mktemp -t gopacket_XXXXXXXX)"
+    echo "Running root test executable $exec as $tmpfile"
+    cp "$exec" "$tmpfile"
+    chmod a+x "$tmpfile"
+    shift
+    sudo "$tmpfile" "$@"
+  fi
+}
+
+if [ "$#" -eq "0" ]; then
+  Usage
+fi
+
+cd $(dirname $0)
+
+# Check for copyright notices.
+for filename in $(find ./ -type f -name '*.go'); do
+  if ! head -n 1 "$filename" | grep -q Copyright; then
+    echo "File '$filename' may not have copyright notice"
+    exit 1
+  fi
+done
+
+set -e
+set -x
+
+if [ ! -z "$ROOT" ]; then
+  echo "Running SUDO to get root priviledges for root tests"
+  sudo echo "have root"
+fi
+
+if [ ! -z "$GEN" ]; then
+  pushd macs
+  go run gen.go | gofmt > valid_mac_prefixes.go
+  popd
+  pushd layers
+  go run gen.go | gofmt > iana_ports.go
+  go run gen2.go | gofmt > enums_generated.go
+  popd
+fi
+
+# Make sure everything is formatted, compiles, and tests pass.
+go fmt ./...
+go test -i ./... 2>/dev/null >/dev/null || true
+go test
+go build
+pushd examples/bytediff
+go build
+popd
+if [ -f /usr/include/pcap.h ]; then
+  pushd pcap
+  go test ./...
+  go build ./...
+  go build pcap_tester.go
+  Root pcap_tester --mode=basic
+  Root pcap_tester --mode=filtered
+  Root pcap_tester --mode=timestamp || echo "You might not support timestamp sources"
+  popd
+  pushd examples/afpacket
+  go build
+  popd
+  pushd examples/pcapdump
+  go build
+  popd
+  pushd examples/arpscan
+  go build
+  popd
+  pushd examples/bidirectional
+  go build
+  popd
+  pushd examples/synscan
+  go build
+  popd
+  pushd examples/httpassembly
+  go build
+  popd
+  pushd examples/statsassembly
+  go build
+  popd
+fi
+pushd macs
+go test ./...
+gofmt -w gen.go
+go build gen.go
+popd
+pushd tcpassembly
+go test ./...
+popd
+pushd reassembly
+go test ./...
+popd
+pushd layers
+gofmt -w gen.go
+go build gen.go
+go test ./...
+popd
+pushd pcapgo
+go test ./...
+go build ./...
+popd
+if [ -f /usr/include/linux/if_packet.h ]; then
+  if grep -q TPACKET_V3 /usr/include/linux/if_packet.h; then
+    pushd afpacket
+    go build ./...
+    go test ./...
+    popd
+  fi
+fi
+if [ -f /usr/include/pfring.h ]; then
+  pushd pfring
+  go test ./...
+  go build ./...
+  popd
+  pushd examples/pfdump
+  go build
+  popd
+fi
+pushd ip4defrag
+go test ./...
+popd
+pushd defrag
+go test ./...
+popd
+
+for travis_script in `ls .travis.*.sh`; do
+  ./$travis_script
+done
+
+# Run our initial commit
+git commit "$@"
+
+if [ -z "$BENCH" ]; then
+  set +x
+  echo "We're not benchmarking and we've committed... we're done!"
+  exit
+fi
+
+### If we get here, we want to run benchmarks from current commit, and compare
+### then to benchmarks from the last --benchmark commit.
+
+# Get our current branch.
+BRANCH="$(git branch | grep '^*' | awk '{print $2}')"
+
+# File we're going to build our commit description in.
+COMMIT_FILE="$(mktemp /tmp/tmp.XXXXXXXX)"
+
+# Add the word "BENCH" to the start of the git commit.
+echo -n "BENCH " > $COMMIT_FILE
+
+# Get the current description... there must be an easier way.
+git log -n 1 | grep '^ ' | sed 's/^    //' >> $COMMIT_FILE
+
+# Get the commit sha for the last benchmark commit
+PREV=$(git log -n 1 --grep='BENCHMARK_MARKER_DO_NOT_CHANGE' | head -n 1 | awk '{print $2}')
+
+## Run current benchmarks
+
+cat >> $COMMIT_FILE <<EOF
+
+
+----------------------------------------------------------
+BENCHMARK_MARKER_DO_NOT_CHANGE
+----------------------------------------------------------
+
+Go version $(go version)
+
+
+TEST BENCHMARKS "$BENCH"
+EOF
+# go seems to have trouble with 'go test --bench=. ./...'
+go test --test.bench="$BENCH" 2>&1 | tee -a $COMMIT_FILE
+pushd layers
+go test --test.bench="$BENCH" 2>&1 | tee -a $COMMIT_FILE
+popd
+cat >> $COMMIT_FILE <<EOF
+
+
+PCAP BENCHMARK
+EOF
+if [ "$BENCH" -eq ".*" ]; then
+  go run pcap/gopacket_benchmark/*.go 2>&1 | tee -a $COMMIT_FILE
+fi
+
+
+
+## Reset to last benchmark commit, run benchmarks
+
+git checkout $PREV
+
+cat >> $COMMIT_FILE <<EOF
+----------------------------------------------------------
+BENCHMARKING AGAINST COMMIT $PREV
+----------------------------------------------------------
+
+
+OLD TEST BENCHMARKS
+EOF
+# go seems to have trouble with 'go test --bench=. ./...'
+go test --test.bench="$BENCH" 2>&1 | tee -a $COMMIT_FILE
+pushd layers
+go test --test.bench="$BENCH" 2>&1 | tee -a $COMMIT_FILE
+popd
+cat >> $COMMIT_FILE <<EOF
+
+
+OLD PCAP BENCHMARK
+EOF
+if [ "$BENCH" -eq ".*" ]; then
+  go run pcap/gopacket_benchmark/*.go 2>&1 | tee -a $COMMIT_FILE
+fi
+
+
+
+## Reset back to the most recent commit, edit the commit message by appending
+## benchmark results.
+git checkout $BRANCH
+git commit --amend -F $COMMIT_FILE

vendor/github.com/google/gopacket/layerclass.go

@@ -0,0 +1,107 @@
+// Copyright 2012 Google, Inc. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+package gopacket
+
+// LayerClass is a set of LayerTypes, used for grabbing one of a number of
+// different types from a packet.
+type LayerClass interface {
+	// Contains returns true if the given layer type should be considered part
+	// of this layer class.
+	Contains(LayerType) bool
+	// LayerTypes returns the set of all layer types in this layer class.
+	// Note that this may not be a fast operation on all LayerClass
+	// implementations.
+	LayerTypes() []LayerType
+}
+
+// Contains implements LayerClass.
+func (l LayerType) Contains(a LayerType) bool {
+	return l == a
+}
+
+// LayerTypes implements LayerClass.
+func (l LayerType) LayerTypes() []LayerType {
+	return []LayerType{l}
+}
+
+// LayerClassSlice implements a LayerClass with a slice.
+type LayerClassSlice []bool
+
+// Contains returns true if the given layer type should be considered part
+// of this layer class.
+func (s LayerClassSlice) Contains(t LayerType) bool {
+	return int(t) < len(s) && s[t]
+}
+
+// LayerTypes returns all layer types in this LayerClassSlice.
+// Because of LayerClassSlice's implementation, this could be quite slow.
+func (s LayerClassSlice) LayerTypes() (all []LayerType) {
+	for i := 0; i < len(s); i++ {
+		if s[i] {
+			all = append(all, LayerType(i))
+		}
+	}
+	return
+}
+
+// NewLayerClassSlice creates a new LayerClassSlice by creating a slice of
+// size max(types) and setting slice[t] to true for each type t.  Note, if
+// you implement your own LayerType and give it a high value, this WILL create
+// a very large slice.
+func NewLayerClassSlice(types []LayerType) LayerClassSlice {
+	var max LayerType
+	for _, typ := range types {
+		if typ > max {
+			max = typ
+		}
+	}
+	t := make([]bool, int(max+1))
+	for _, typ := range types {
+		t[typ] = true
+	}
+	return t
+}
+
+// LayerClassMap implements a LayerClass with a map.
+type LayerClassMap map[LayerType]bool
+
+// Contains returns true if the given layer type should be considered part
+// of this layer class.
+func (m LayerClassMap) Contains(t LayerType) bool {
+	return m[t]
+}
+
+// LayerTypes returns all layer types in this LayerClassMap.
+func (m LayerClassMap) LayerTypes() (all []LayerType) {
+	for t := range m {
+		all = append(all, t)
+	}
+	return
+}
+
+// NewLayerClassMap creates a LayerClassMap and sets map[t] to true for each
+// type in types.
+func NewLayerClassMap(types []LayerType) LayerClassMap {
+	m := LayerClassMap{}
+	for _, typ := range types {
+		m[typ] = true
+	}
+	return m
+}
+
+// NewLayerClass creates a LayerClass, attempting to be smart about which type
+// it creates based on which types are passed in.
+func NewLayerClass(types []LayerType) LayerClass {
+	for _, typ := range types {
+		if typ > maxLayerType {
+			// NewLayerClassSlice could create a very large object, so instead create
+			// a map.
+			return NewLayerClassMap(types)
+		}
+	}
+	return NewLayerClassSlice(types)
+}

vendor/github.com/google/gopacket/layers/.lint_blacklist

@@ -0,0 +1,39 @@
+dot11.go
+eap.go
+endpoints.go
+enums_generated.go
+enums.go
+ethernet.go
+geneve.go
+icmp4.go
+icmp6.go
+igmp.go
+ip4.go
+ip6.go
+layertypes.go
+linux_sll.go
+llc.go
+lldp.go
+mpls.go
+ndp.go
+ntp.go
+ospf.go
+pflog.go
+pppoe.go
+prism.go
+radiotap.go
+rudp.go
+sctp.go
+sflow.go
+tcp.go
+tcpip.go
+tls.go
+tls_alert.go
+tls_appdata.go
+tls_cipherspec.go
+tls_hanshake.go
+tls_test.go
+udp.go
+udplite.go
+usb.go
+vrrp.go

vendor/github.com/google/gopacket/layers/arp.go

@@ -0,0 +1,118 @@
+// Copyright 2012 Google, Inc. All rights reserved.
+// Copyright 2009-2011 Andreas Krennmair. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+package layers
+
+import (
+	"encoding/binary"
+	"errors"
+	"fmt"
+
+	"github.com/google/gopacket"
+)
+
+// Potential values for ARP.Operation.
+const (
+	ARPRequest = 1
+	ARPReply   = 2
+)
+
+// ARP is a ARP packet header.
+type ARP struct {
+	BaseLayer
+	AddrType          LinkType
+	Protocol          EthernetType
+	HwAddressSize     uint8
+	ProtAddressSize   uint8
+	Operation         uint16
+	SourceHwAddress   []byte
+	SourceProtAddress []byte
+	DstHwAddress      []byte
+	DstProtAddress    []byte
+}
+
+// LayerType returns LayerTypeARP
+func (arp *ARP) LayerType() gopacket.LayerType { return LayerTypeARP }
+
+// DecodeFromBytes decodes the given bytes into this layer.
+func (arp *ARP) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+	if len(data) < 8 {
+		df.SetTruncated()
+		return fmt.Errorf("ARP length %d too short", len(data))
+	}
+	arp.AddrType = LinkType(binary.BigEndian.Uint16(data[0:2]))
+	arp.Protocol = EthernetType(binary.BigEndian.Uint16(data[2:4]))
+	arp.HwAddressSize = data[4]
+	arp.ProtAddressSize = data[5]
+	arp.Operation = binary.BigEndian.Uint16(data[6:8])
+	arpLength := 8 + 2*arp.HwAddressSize + 2*arp.ProtAddressSize
+	if len(data) < int(arpLength) {
+		df.SetTruncated()
+		return fmt.Errorf("ARP length %d too short, %d expected", len(data), arpLength)
+	}
+	arp.SourceHwAddress = data[8 : 8+arp.HwAddressSize]
+	arp.SourceProtAddress = data[8+arp.HwAddressSize : 8+arp.HwAddressSize+arp.ProtAddressSize]
+	arp.DstHwAddress = data[8+arp.HwAddressSize+arp.ProtAddressSize : 8+2*arp.HwAddressSize+arp.ProtAddressSize]
+	arp.DstProtAddress = data[8+2*arp.HwAddressSize+arp.ProtAddressSize : 8+2*arp.HwAddressSize+2*arp.ProtAddressSize]
+
+	arp.Contents = data[:arpLength]
+	arp.Payload = data[arpLength:]
+	return nil
+}
+
+// SerializeTo writes the serialized form of this layer into the
+// SerializationBuffer, implementing gopacket.SerializableLayer.
+// See the docs for gopacket.SerializableLayer for more info.
+func (arp *ARP) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	size := 8 + len(arp.SourceHwAddress) + len(arp.SourceProtAddress) + len(arp.DstHwAddress) + len(arp.DstProtAddress)
+	bytes, err := b.PrependBytes(size)
+	if err != nil {
+		return err
+	}
+	if opts.FixLengths {
+		if len(arp.SourceHwAddress) != len(arp.DstHwAddress) {
+			return errors.New("mismatched hardware address sizes")
+		}
+		arp.HwAddressSize = uint8(len(arp.SourceHwAddress))
+		if len(arp.SourceProtAddress) != len(arp.DstProtAddress) {
+			return errors.New("mismatched prot address sizes")
+		}
+		arp.ProtAddressSize = uint8(len(arp.SourceProtAddress))
+	}
+	binary.BigEndian.PutUint16(bytes, uint16(arp.AddrType))
+	binary.BigEndian.PutUint16(bytes[2:], uint16(arp.Protocol))
+	bytes[4] = arp.HwAddressSize
+	bytes[5] = arp.ProtAddressSize
+	binary.BigEndian.PutUint16(bytes[6:], arp.Operation)
+	start := 8
+	for _, addr := range [][]byte{
+		arp.SourceHwAddress,
+		arp.SourceProtAddress,
+		arp.DstHwAddress,
+		arp.DstProtAddress,
+	} {
+		copy(bytes[start:], addr)
+		start += len(addr)
+	}
+	return nil
+}
+
+// CanDecode returns the set of layer types that this DecodingLayer can decode.
+func (arp *ARP) CanDecode() gopacket.LayerClass {
+	return LayerTypeARP
+}
+
+// NextLayerType returns the layer type contained by this DecodingLayer.
+func (arp *ARP) NextLayerType() gopacket.LayerType {
+	return gopacket.LayerTypePayload
+}
+
+func decodeARP(data []byte, p gopacket.PacketBuilder) error {
+
+	arp := &ARP{}
+	return decodingLayerDecoder(arp, data, p)
+}

vendor/github.com/google/gopacket/layers/asf.go

@@ -0,0 +1,166 @@
+// Copyright 2019 The GoPacket Authors. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license that can be found
+// in the LICENSE file in the root of the source tree.
+
+package layers
+
+// This file implements the ASF RMCP payload specified in section 3.2.2.3 of
+// https://www.dmtf.org/sites/default/files/standards/documents/DSP0136.pdf
+
+import (
+	"encoding/binary"
+	"fmt"
+
+	"github.com/google/gopacket"
+)
+
+const (
+	// ASFRMCPEnterprise is the IANA-assigned Enterprise Number of the ASF-RMCP.
+	ASFRMCPEnterprise uint32 = 4542
+)
+
+// ASFDataIdentifier encapsulates fields used to uniquely identify the format of
+// the data block.
+//
+// While the enterprise number is almost always 4542 (ASF-RMCP), we support
+// registering layers using structs of this type as a key in case any users are
+// using OEM-extensions.
+type ASFDataIdentifier struct {
+
+	// Enterprise is the IANA Enterprise Number associated with the entity that
+	// defines the message type. A list can be found at
+	// https://www.iana.org/assignments/enterprise-numbers/enterprise-numbers.
+	// This can be thought of as the namespace for the message type.
+	Enterprise uint32
+
+	// Type is the message type, defined by the entity associated with the
+	// enterprise above. No pressure, but in the context of EN 4542, 1 byte is
+	// the difference between sending a ping and telling a machine to do an
+	// unconditional power down (0x80 and 0x12 respectively).
+	Type uint8
+}
+
+// LayerType returns the payload layer type corresponding to an ASF message
+// type.
+func (a ASFDataIdentifier) LayerType() gopacket.LayerType {
+	if lt := asfDataLayerTypes[a]; lt != 0 {
+		return lt
+	}
+
+	// some layer types don't have a payload, e.g. ASF-RMCP Presence Ping.
+	return gopacket.LayerTypePayload
+}
+
+// RegisterASFLayerType allows specifying that the data block of ASF packets
+// with a given enterprise number and type should be processed by a given layer
+// type. This overrides any existing registrations, including defaults.
+func RegisterASFLayerType(a ASFDataIdentifier, l gopacket.LayerType) {
+	asfDataLayerTypes[a] = l
+}
+
+var (
+	// ASFDataIdentifierPresencePong is the message type of the response to a
+	// Presence Ping message. It indicates the sender is ASF-RMCP-aware.
+	ASFDataIdentifierPresencePong = ASFDataIdentifier{
+		Enterprise: ASFRMCPEnterprise,
+		Type:       0x40,
+	}
+
+	// ASFDataIdentifierPresencePing is a message type sent to a managed client
+	// to solicit a Presence Pong response. Clients may ignore this if the RMCP
+	// version is unsupported. Sending this message with a sequence number <255
+	// is the recommended way of finding out whether an implementation sends
+	// RMCP ACKs (e.g. iDRAC does, Super Micro does not).
+	//
+	// Systems implementing IPMI must respond to this ping to conform to the
+	// spec, so it is a good substitute for an ICMP ping.
+	ASFDataIdentifierPresencePing = ASFDataIdentifier{
+		Enterprise: ASFRMCPEnterprise,
+		Type:       0x80,
+	}
+
+	// asfDataLayerTypes is used to find the next layer for a given ASF header.
+	asfDataLayerTypes = map[ASFDataIdentifier]gopacket.LayerType{
+		ASFDataIdentifierPresencePong: LayerTypeASFPresencePong,
+	}
+)
+
+// ASF defines ASF's generic RMCP message Data block format. See section
+// 3.2.2.3.
+type ASF struct {
+	BaseLayer
+	ASFDataIdentifier
+
+	// Tag is used to match request/response pairs. The tag of a response is set
+	// to that of the message it is responding to. If a message is
+	// unidirectional, i.e. not part of a request/response pair, this is set to
+	// 255.
+	Tag uint8
+
+	// 1 byte reserved, set to 0x00.
+
+	// Length is the length of this layer's payload in bytes.
+	Length uint8
+}
+
+// LayerType returns LayerTypeASF. It partially satisfies Layer and
+// SerializableLayer.
+func (*ASF) LayerType() gopacket.LayerType {
+	return LayerTypeASF
+}
+
+// CanDecode returns LayerTypeASF. It partially satisfies DecodingLayer.
+func (a *ASF) CanDecode() gopacket.LayerClass {
+	return a.LayerType()
+}
+
+// DecodeFromBytes makes the layer represent the provided bytes. It partially
+// satisfies DecodingLayer.
+func (a *ASF) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+	if len(data) < 8 {
+		df.SetTruncated()
+		return fmt.Errorf("invalid ASF data header, length %v less than 8",
+			len(data))
+	}
+
+	a.BaseLayer.Contents = data[:8]
+	a.BaseLayer.Payload = data[8:]
+
+	a.Enterprise = binary.BigEndian.Uint32(data[:4])
+	a.Type = uint8(data[4])
+	a.Tag = uint8(data[5])
+	// 1 byte reserved
+	a.Length = uint8(data[7])
+	return nil
+}
+
+// NextLayerType returns the layer type corresponding to the message type of
+// this ASF data layer. This partially satisfies DecodingLayer.
+func (a *ASF) NextLayerType() gopacket.LayerType {
+	return a.ASFDataIdentifier.LayerType()
+}
+
+// SerializeTo writes the serialized fom of this layer into the SerializeBuffer,
+// partially satisfying SerializableLayer.
+func (a *ASF) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	payload := b.Bytes()
+	bytes, err := b.PrependBytes(8)
+	if err != nil {
+		return err
+	}
+	binary.BigEndian.PutUint32(bytes[:4], a.Enterprise)
+	bytes[4] = uint8(a.Type)
+	bytes[5] = a.Tag
+	bytes[6] = 0x00
+	if opts.FixLengths {
+		a.Length = uint8(len(payload))
+	}
+	bytes[7] = a.Length
+	return nil
+}
+
+// decodeASF decodes the byte slice into an RMCP-ASF data struct.
+func decodeASF(data []byte, p gopacket.PacketBuilder) error {
+	return decodingLayerDecoder(&ASF{}, data, p)
+}

vendor/github.com/google/gopacket/layers/asf_presencepong.go

@@ -0,0 +1,194 @@
+// Copyright 2019 The GoPacket Authors. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license that can be found
+// in the LICENSE file in the root of the source tree.
+
+package layers
+
+// This file implements the RMCP ASF Presence Pong message, specified in section
+// 3.2.4.3 of
+// https://www.dmtf.org/sites/default/files/standards/documents/DSP0136.pdf. It
+// also contains non-competing elements from IPMI v2.0, specified in section
+// 13.2.4 of
+// https://www.intel.com/content/dam/www/public/us/en/documents/specification-updates/ipmi-intelligent-platform-mgt-interface-spec-2nd-gen-v2-0-spec-update.pdf.
+
+import (
+	"encoding/binary"
+	"fmt"
+
+	"github.com/google/gopacket"
+)
+
+type (
+	// ASFEntity is the type of individual entities that a Presence Pong
+	// response can indicate support of. The entities currently implemented by
+	// the spec are IPMI and ASFv1.
+	ASFEntity uint8
+
+	// ASFInteraction is the type of individual interactions that a Presence
+	// Pong response can indicate support for. The interactions currently
+	// implemented by the spec are RMCP security extensions. Although not
+	// specified, IPMI uses this field to indicate support for DASH, which is
+	// supported as well.
+	ASFInteraction uint8
+)
+
+const (
+	// ASFDCMIEnterprise is the IANA-assigned Enterprise Number of the Data
+	// Center Manageability Interface Forum. The Presence Pong response's
+	// Enterprise field being set to this value indicates support for DCMI. The
+	// DCMI spec regards the OEM field as reserved, so these should be null.
+	ASFDCMIEnterprise uint32 = 36465
+
+	// ASFPresencePongEntityIPMI ANDs with Presence Pong's supported entities
+	// field if the managed system supports IPMI.
+	ASFPresencePongEntityIPMI ASFEntity = 1 << 7
+
+	// ASFPresencePongEntityASFv1 ANDs with Presence Pong's supported entities
+	// field if the managed system supports ASF v1.0.
+	ASFPresencePongEntityASFv1 ASFEntity = 1
+
+	// ASFPresencePongInteractionSecurityExtensions ANDs with Presence Pong's
+	// supported interactions field if the managed system supports RMCP v2.0
+	// security extensions. See section 3.2.3.
+	ASFPresencePongInteractionSecurityExtensions ASFInteraction = 1 << 7
+
+	// ASFPresencePongInteractionDASH ANDs with Presence Pong's supported
+	// interactions field if the managed system supports DMTF DASH. See
+	// https://www.dmtf.org/standards/dash.
+	ASFPresencePongInteractionDASH ASFInteraction = 1 << 5
+)
+
+// ASFPresencePong defines the structure of a Presence Pong message's payload.
+// See section 3.2.4.3.
+type ASFPresencePong struct {
+	BaseLayer
+
+	// Enterprise is the IANA Enterprise Number of an entity that has defined
+	// OEM-specific capabilities for the managed client. If no such capabilities
+	// exist, this is set to ASF's IANA Enterprise Number.
+	Enterprise uint32
+
+	// OEM identifies OEM-specific capabilities. Its structure is defined by the
+	// OEM. This is set to 0s if no OEM-specific capabilities exist. This
+	// implementation does not change byte order from the wire for this field.
+	OEM [4]byte
+
+	// We break out entities and interactions into separate booleans as
+	// discovery is the entire point of this type of message, so we assume they
+	// are accessed. It also makes gopacket's default layer printing more
+	// useful.
+
+	// IPMI is true if IPMI is supported by the managed system. There is no
+	// explicit version in the specification, however given the dates, this is
+	// assumed to be IPMI v1.0.  Support for IPMI is contained in the "supported
+	// entities" field of the presence pong payload.
+	IPMI bool
+
+	// ASFv1 indicates support for ASF v1.0. This seems somewhat redundant as
+	// ASF must be supported in order to receive a response. This is contained
+	// in the "supported entities" field of the presence pong payload.
+	ASFv1 bool
+
+	// SecurityExtensions indicates support for RMCP Security Extensions,
+	// specified in ASF v2.0. This will always be false for v1.x
+	// implementations. This is contained in the "supported interactions" field
+	// of the presence pong payload. This field is defined in ASF v1.0, but has
+	// no useful value.
+	SecurityExtensions bool
+
+	// DASH is true if DMTF DASH is supported. This is not specified in ASF
+	// v2.0, but in IPMI v2.0, however the former does not preclude it, so we
+	// support it.
+	DASH bool
+
+	// 6 bytes reserved after the entities and interactions fields, set to 0s.
+}
+
+// SupportsDCMI returns whether the Presence Pong message indicates support for
+// the Data Center Management Interface, which is an extension of IPMI v2.0.
+func (a *ASFPresencePong) SupportsDCMI() bool {
+	return a.Enterprise == ASFDCMIEnterprise && a.IPMI && a.ASFv1
+}
+
+// LayerType returns LayerTypeASFPresencePong. It partially satisfies Layer and
+// SerializableLayer.
+func (*ASFPresencePong) LayerType() gopacket.LayerType {
+	return LayerTypeASFPresencePong
+}
+
+// CanDecode returns LayerTypeASFPresencePong. It partially satisfies
+// DecodingLayer.
+func (a *ASFPresencePong) CanDecode() gopacket.LayerClass {
+	return a.LayerType()
+}
+
+// DecodeFromBytes makes the layer represent the provided bytes. It partially
+// satisfies DecodingLayer.
+func (a *ASFPresencePong) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+	if len(data) < 16 {
+		df.SetTruncated()
+		return fmt.Errorf("invalid ASF presence pong payload, length %v less than 16",
+			len(data))
+	}
+
+	a.BaseLayer.Contents = data[:16]
+	a.BaseLayer.Payload = data[16:]
+
+	a.Enterprise = binary.BigEndian.Uint32(data[:4])
+	copy(a.OEM[:], data[4:8]) // N.B. no byte order change
+	a.IPMI = data[8]&uint8(ASFPresencePongEntityIPMI) != 0
+	a.ASFv1 = data[8]&uint8(ASFPresencePongEntityASFv1) != 0
+	a.SecurityExtensions = data[9]&uint8(ASFPresencePongInteractionSecurityExtensions) != 0
+	a.DASH = data[9]&uint8(ASFPresencePongInteractionDASH) != 0
+	// ignore remaining 6 bytes; should be set to 0s
+	return nil
+}
+
+// NextLayerType returns LayerTypePayload, as there are no further layers to
+// decode. This partially satisfies DecodingLayer.
+func (a *ASFPresencePong) NextLayerType() gopacket.LayerType {
+	return gopacket.LayerTypePayload
+}
+
+// SerializeTo writes the serialized fom of this layer into the SerializeBuffer,
+// partially satisfying SerializableLayer.
+func (a *ASFPresencePong) SerializeTo(b gopacket.SerializeBuffer, _ gopacket.SerializeOptions) error {
+	bytes, err := b.PrependBytes(16)
+	if err != nil {
+		return err
+	}
+
+	binary.BigEndian.PutUint32(bytes[:4], a.Enterprise)
+
+	copy(bytes[4:8], a.OEM[:])
+
+	bytes[8] = 0
+	if a.IPMI {
+		bytes[8] |= uint8(ASFPresencePongEntityIPMI)
+	}
+	if a.ASFv1 {
+		bytes[8] |= uint8(ASFPresencePongEntityASFv1)
+	}
+
+	bytes[9] = 0
+	if a.SecurityExtensions {
+		bytes[9] |= uint8(ASFPresencePongInteractionSecurityExtensions)
+	}
+	if a.DASH {
+		bytes[9] |= uint8(ASFPresencePongInteractionDASH)
+	}
+
+	// zero-out remaining 6 bytes
+	for i := 10; i < len(bytes); i++ {
+		bytes[i] = 0x00
+	}
+
+	return nil
+}
+
+// decodeASFPresencePong decodes the byte slice into an RMCP-ASF Presence Pong
+// struct.
+func decodeASFPresencePong(data []byte, p gopacket.PacketBuilder) error {
+	return decodingLayerDecoder(&ASFPresencePong{}, data, p)
+}

vendor/github.com/google/gopacket/layers/base.go

@@ -0,0 +1,52 @@
+// Copyright 2012 Google, Inc. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+package layers
+
+import (
+	"github.com/google/gopacket"
+)
+
+// BaseLayer is a convenience struct which implements the LayerData and
+// LayerPayload functions of the Layer interface.
+type BaseLayer struct {
+	// Contents is the set of bytes that make up this layer.  IE: for an
+	// Ethernet packet, this would be the set of bytes making up the
+	// Ethernet frame.
+	Contents []byte
+	// Payload is the set of bytes contained by (but not part of) this
+	// Layer.  Again, to take Ethernet as an example, this would be the
+	// set of bytes encapsulated by the Ethernet protocol.
+	Payload []byte
+}
+
+// LayerContents returns the bytes of the packet layer.
+func (b *BaseLayer) LayerContents() []byte { return b.Contents }
+
+// LayerPayload returns the bytes contained within the packet layer.
+func (b *BaseLayer) LayerPayload() []byte { return b.Payload }
+
+type layerDecodingLayer interface {
+	gopacket.Layer
+	DecodeFromBytes([]byte, gopacket.DecodeFeedback) error
+	NextLayerType() gopacket.LayerType
+}
+
+func decodingLayerDecoder(d layerDecodingLayer, data []byte, p gopacket.PacketBuilder) error {
+	err := d.DecodeFromBytes(data, p)
+	if err != nil {
+		return err
+	}
+	p.AddLayer(d)
+	next := d.NextLayerType()
+	if next == gopacket.LayerTypeZero {
+		return nil
+	}
+	return p.NextDecoder(next)
+}
+
+// hacky way to zero out memory... there must be a better way?
+var lotsOfZeros [1024]byte

vendor/github.com/google/gopacket/layers/bfd.go

@@ -0,0 +1,481 @@
+// Copyright 2017 Google, Inc. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+//
+
+package layers
+
+import (
+	"encoding/binary"
+	"errors"
+
+	"github.com/google/gopacket"
+)
+
+// BFD Control Packet Format
+// -------------------------
+// The current version of BFD's RFC (RFC 5880) contains the following
+// diagram for the BFD Control packet format:
+//
+//      0                   1                   2                   3
+//      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+//     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//     |Vers |  Diag   |Sta|P|F|C|A|D|M|  Detect Mult  |    Length     |
+//     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//     |                       My Discriminator                        |
+//     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//     |                      Your Discriminator                       |
+//     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//     |                    Desired Min TX Interval                    |
+//     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//     |                   Required Min RX Interval                    |
+//     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//     |                 Required Min Echo RX Interval                 |
+//     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//
+//     An optional Authentication Section MAY be present:
+//
+//      0                   1                   2                   3
+//      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+//     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//     |   Auth Type   |   Auth Len    |    Authentication Data...     |
+//     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//
+//
+//     Simple Password Authentication Section Format
+//     ---------------------------------------------
+//      0                   1                   2                   3
+//      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+//     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//     |   Auth Type   |   Auth Len    |  Auth Key ID  |  Password...  |
+//     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//     |                              ...                              |
+//     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//
+//
+//     Keyed MD5 and Meticulous Keyed MD5 Authentication Section Format
+//     ----------------------------------------------------------------
+//      0                   1                   2                   3
+//      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+//     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//     |   Auth Type   |   Auth Len    |  Auth Key ID  |   Reserved    |
+//     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//     |                        Sequence Number                        |
+//     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//     |                      Auth Key/Digest...                       |
+//     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//     |                              ...                              |
+//     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//
+//
+//     Keyed SHA1 and Meticulous Keyed SHA1 Authentication Section Format
+//     ------------------------------------------------------------------
+//      0                   1                   2                   3
+//      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+//     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//     |   Auth Type   |   Auth Len    |  Auth Key ID  |   Reserved    |
+//     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//     |                        Sequence Number                        |
+//     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//     |                       Auth Key/Hash...                        |
+//     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//     |                              ...                              |
+//     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//
+//     From https://tools.ietf.org/rfc/rfc5880.txt
+const bfdMinimumRecordSizeInBytes int = 24
+
+// BFDVersion represents the version as decoded from the BFD control message
+type BFDVersion uint8
+
+// BFDDiagnostic represents diagnostic infomation about a BFD session
+type BFDDiagnostic uint8
+
+// constants that define BFDDiagnostic flags
+const (
+	BFDDiagnosticNone               BFDDiagnostic = 0 // No Diagnostic
+	BFDDiagnosticTimeExpired        BFDDiagnostic = 1 // Control Detection Time Expired
+	BFDDiagnosticEchoFailed         BFDDiagnostic = 2 // Echo Function Failed
+	BFDDiagnosticNeighborSignalDown BFDDiagnostic = 3 // Neighbor Signaled Session Down
+	BFDDiagnosticForwardPlaneReset  BFDDiagnostic = 4 // Forwarding Plane Reset
+	BFDDiagnosticPathDown           BFDDiagnostic = 5 // Path Down
+	BFDDiagnosticConcatPathDown     BFDDiagnostic = 6 // Concatenated Path Down
+	BFDDiagnosticAdminDown          BFDDiagnostic = 7 // Administratively Down
+	BFDDiagnosticRevConcatPathDown  BFDDiagnostic = 8 // Reverse Concatenated Path Dow
+)
+
+// String returns a string version of BFDDiagnostic
+func (bd BFDDiagnostic) String() string {
+	switch bd {
+	default:
+		return "Unknown"
+	case BFDDiagnosticNone:
+		return "None"
+	case BFDDiagnosticTimeExpired:
+		return "Control Detection Time Expired"
+	case BFDDiagnosticEchoFailed:
+		return "Echo Function Failed"
+	case BFDDiagnosticNeighborSignalDown:
+		return "Neighbor Signaled Session Down"
+	case BFDDiagnosticForwardPlaneReset:
+		return "Forwarding Plane Reset"
+	case BFDDiagnosticPathDown:
+		return "Path Down"
+	case BFDDiagnosticConcatPathDown:
+		return "Concatenated Path Down"
+	case BFDDiagnosticAdminDown:
+		return "Administratively Down"
+	case BFDDiagnosticRevConcatPathDown:
+		return "Reverse Concatenated Path Down"
+	}
+}
+
+// BFDState represents the state of a BFD session
+type BFDState uint8
+
+// constants that define BFDState
+const (
+	BFDStateAdminDown BFDState = 0
+	BFDStateDown      BFDState = 1
+	BFDStateInit      BFDState = 2
+	BFDStateUp        BFDState = 3
+)
+
+// String returns a string version of BFDState
+func (s BFDState) String() string {
+	switch s {
+	default:
+		return "Unknown"
+	case BFDStateAdminDown:
+		return "Admin Down"
+	case BFDStateDown:
+		return "Down"
+	case BFDStateInit:
+		return "Init"
+	case BFDStateUp:
+		return "Up"
+	}
+}
+
+// BFDDetectMultiplier represents the negotiated transmit interval,
+// multiplied by this value, provides the Detection Time for the
+// receiving system in Asynchronous mode.
+type BFDDetectMultiplier uint8
+
+// BFDDiscriminator is a unique, nonzero discriminator value used
+// to demultiplex multiple BFD sessions between the same pair of systems.
+type BFDDiscriminator uint32
+
+// BFDTimeInterval represents a time interval in microseconds
+type BFDTimeInterval uint32
+
+// BFDAuthType represents the authentication used in the BFD session
+type BFDAuthType uint8
+
+// constants that define the BFDAuthType
+const (
+	BFDAuthTypeNone                BFDAuthType = 0 // No Auth
+	BFDAuthTypePassword            BFDAuthType = 1 // Simple Password
+	BFDAuthTypeKeyedMD5            BFDAuthType = 2 // Keyed MD5
+	BFDAuthTypeMeticulousKeyedMD5  BFDAuthType = 3 // Meticulous Keyed MD5
+	BFDAuthTypeKeyedSHA1           BFDAuthType = 4 // Keyed SHA1
+	BFDAuthTypeMeticulousKeyedSHA1 BFDAuthType = 5 // Meticulous Keyed SHA1
+)
+
+// String returns a string version of BFDAuthType
+func (at BFDAuthType) String() string {
+	switch at {
+	default:
+		return "Unknown"
+	case BFDAuthTypeNone:
+		return "No Authentication"
+	case BFDAuthTypePassword:
+		return "Simple Password"
+	case BFDAuthTypeKeyedMD5:
+		return "Keyed MD5"
+	case BFDAuthTypeMeticulousKeyedMD5:
+		return "Meticulous Keyed MD5"
+	case BFDAuthTypeKeyedSHA1:
+		return "Keyed SHA1"
+	case BFDAuthTypeMeticulousKeyedSHA1:
+		return "Meticulous Keyed SHA1"
+	}
+}
+
+// BFDAuthKeyID represents the authentication key ID in use for
+// this packet.  This allows multiple keys to be active simultaneously.
+type BFDAuthKeyID uint8
+
+// BFDAuthSequenceNumber represents the sequence number for this packet.
+// For Keyed Authentication, this value is incremented occasionally.  For
+// Meticulous Keyed Authentication, this value is incremented for each
+// successive packet transmitted for a session.  This provides protection
+// against replay attacks.
+type BFDAuthSequenceNumber uint32
+
+// BFDAuthData represents the authentication key or digest
+type BFDAuthData []byte
+
+// BFDAuthHeader represents authentication data used in the BFD session
+type BFDAuthHeader struct {
+	AuthType       BFDAuthType
+	KeyID          BFDAuthKeyID
+	SequenceNumber BFDAuthSequenceNumber
+	Data           BFDAuthData
+}
+
+// Length returns the data length of the BFDAuthHeader based on the
+// authentication type
+func (h *BFDAuthHeader) Length() int {
+	switch h.AuthType {
+	case BFDAuthTypePassword:
+		return 3 + len(h.Data)
+	case BFDAuthTypeKeyedMD5, BFDAuthTypeMeticulousKeyedMD5:
+		return 8 + len(h.Data)
+	case BFDAuthTypeKeyedSHA1, BFDAuthTypeMeticulousKeyedSHA1:
+		return 8 + len(h.Data)
+	default:
+		return 0
+	}
+}
+
+// BFD represents a BFD control message packet whose payload contains
+// the control information required to for a BFD session.
+//
+// References
+// ----------
+//
+// Wikipedia's BFD entry:
+//     https://en.wikipedia.org/wiki/Bidirectional_Forwarding_Detection
+//     This is the best place to get an overview of BFD.
+//
+// RFC 5880 "Bidirectional Forwarding Detection (BFD)" (2010)
+//     https://tools.ietf.org/html/rfc5880
+//     This is the original BFD specification.
+//
+// RFC 5881 "Bidirectional Forwarding Detection (BFD) for IPv4 and IPv6 (Single Hop)" (2010)
+//     https://tools.ietf.org/html/rfc5881
+//     Describes the use of the Bidirectional Forwarding Detection (BFD)
+//     protocol over IPv4 and IPv6 for single IP hops.
+type BFD struct {
+	BaseLayer // Stores the packet bytes and payload bytes.
+
+	Version                   BFDVersion          // Version of the BFD protocol.
+	Diagnostic                BFDDiagnostic       // Diagnostic code for last state change
+	State                     BFDState            // Current state
+	Poll                      bool                // Requesting verification
+	Final                     bool                // Responding to a received BFD Control packet that had the Poll (P) bit set.
+	ControlPlaneIndependent   bool                // BFD implementation does not share fate with its control plane
+	AuthPresent               bool                // Authentication Section is present and the session is to be authenticated
+	Demand                    bool                // Demand mode is active
+	Multipoint                bool                // For future point-to-multipoint extensions. Must always be zero
+	DetectMultiplier          BFDDetectMultiplier // Detection time multiplier
+	MyDiscriminator           BFDDiscriminator    // A unique, nonzero discriminator value
+	YourDiscriminator         BFDDiscriminator    // discriminator received from the remote system.
+	DesiredMinTxInterval      BFDTimeInterval     // Minimum interval, in microseconds,  the local system would like to use when transmitting BFD Control packets
+	RequiredMinRxInterval     BFDTimeInterval     // Minimum interval, in microseconds, between received BFD Control packets that this system is capable of supporting
+	RequiredMinEchoRxInterval BFDTimeInterval     // Minimum interval, in microseconds, between received BFD Echo packets that this system is capable of supporting
+	AuthHeader                *BFDAuthHeader      // Authentication data, variable length.
+}
+
+// Length returns the data length of a BFD Control message which
+// changes based on the presence and type of authentication
+// contained in the message
+func (d *BFD) Length() int {
+	if d.AuthPresent && (d.AuthHeader != nil) {
+		return bfdMinimumRecordSizeInBytes + d.AuthHeader.Length()
+	}
+
+	return bfdMinimumRecordSizeInBytes
+}
+
+// LayerType returns the layer type of the BFD object, which is LayerTypeBFD.
+func (d *BFD) LayerType() gopacket.LayerType {
+	return LayerTypeBFD
+}
+
+// decodeBFD analyses a byte slice and attempts to decode it as a BFD
+// control packet
+//
+// If it succeeds, it loads p with information about the packet and returns nil.
+// If it fails, it returns an error (non nil).
+//
+// This function is employed in layertypes.go to register the BFD layer.
+func decodeBFD(data []byte, p gopacket.PacketBuilder) error {
+
+	// Attempt to decode the byte slice.
+	d := &BFD{}
+	err := d.DecodeFromBytes(data, p)
+	if err != nil {
+		return err
+	}
+
+	// If the decoding worked, add the layer to the packet and set it
+	// as the application layer too, if there isn't already one.
+	p.AddLayer(d)
+	p.SetApplicationLayer(d)
+
+	return nil
+}
+
+// DecodeFromBytes analyses a byte slice and attempts to decode it as a BFD
+// control packet.
+//
+// Upon succeeds, it loads the BFD object with information about the packet
+// and returns nil.
+// Upon failure, it returns an error (non nil).
+func (d *BFD) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+
+	// If the data block is too short to be a BFD record, then return an error.
+	if len(data) < bfdMinimumRecordSizeInBytes {
+		df.SetTruncated()
+		return errors.New("BFD packet too short")
+	}
+
+	pLen := uint8(data[3])
+	if len(data) != int(pLen) {
+		return errors.New("BFD packet length does not match")
+	}
+
+	// BFD type embeds type BaseLayer which contains two fields:
+	//    Contents is supposed to contain the bytes of the data at this level.
+	//    Payload is supposed to contain the payload of this level.
+	// Here we set the baselayer to be the bytes of the BFD record.
+	d.BaseLayer = BaseLayer{Contents: data[:len(data)]}
+
+	// Extract the fields from the block of bytes.
+	// To make sense of this, refer to the packet diagram
+	// above and the section on endian conventions.
+
+	// The first few fields are all packed into the first 32 bits. Unpack them.
+	d.Version = BFDVersion(((data[0] & 0xE0) >> 5))
+	d.Diagnostic = BFDDiagnostic(data[0] & 0x1F)
+	data = data[1:]
+
+	d.State = BFDState((data[0] & 0xC0) >> 6)
+	d.Poll = data[0]&0x20 != 0
+	d.Final = data[0]&0x10 != 0
+	d.ControlPlaneIndependent = data[0]&0x08 != 0
+	d.AuthPresent = data[0]&0x04 != 0
+	d.Demand = data[0]&0x02 != 0
+	d.Multipoint = data[0]&0x01 != 0
+	data = data[1:]
+
+	data, d.DetectMultiplier = data[1:], BFDDetectMultiplier(data[0])
+	data, _ = data[1:], uint8(data[0]) // Consume length
+
+	// The remaining fields can just be copied in big endian order.
+	data, d.MyDiscriminator = data[4:], BFDDiscriminator(binary.BigEndian.Uint32(data[:4]))
+	data, d.YourDiscriminator = data[4:], BFDDiscriminator(binary.BigEndian.Uint32(data[:4]))
+	data, d.DesiredMinTxInterval = data[4:], BFDTimeInterval(binary.BigEndian.Uint32(data[:4]))
+	data, d.RequiredMinRxInterval = data[4:], BFDTimeInterval(binary.BigEndian.Uint32(data[:4]))
+	data, d.RequiredMinEchoRxInterval = data[4:], BFDTimeInterval(binary.BigEndian.Uint32(data[:4]))
+
+	if d.AuthPresent && (len(data) > 2) {
+		d.AuthHeader = &BFDAuthHeader{}
+		data, d.AuthHeader.AuthType = data[1:], BFDAuthType(data[0])
+		data, _ = data[1:], uint8(data[0]) // Consume length
+		data, d.AuthHeader.KeyID = data[1:], BFDAuthKeyID(data[0])
+
+		switch d.AuthHeader.AuthType {
+		case BFDAuthTypePassword:
+			d.AuthHeader.Data = BFDAuthData(data)
+		case BFDAuthTypeKeyedMD5, BFDAuthTypeMeticulousKeyedMD5:
+			// Skipped reserved byte
+			data, d.AuthHeader.SequenceNumber = data[5:], BFDAuthSequenceNumber(binary.BigEndian.Uint32(data[1:5]))
+			d.AuthHeader.Data = BFDAuthData(data)
+		case BFDAuthTypeKeyedSHA1, BFDAuthTypeMeticulousKeyedSHA1:
+			// Skipped reserved byte
+			data, d.AuthHeader.SequenceNumber = data[5:], BFDAuthSequenceNumber(binary.BigEndian.Uint32(data[1:5]))
+			d.AuthHeader.Data = BFDAuthData(data)
+		}
+	}
+
+	return nil
+}
+
+// SerializeTo writes the serialized form of this layer into the
+// SerializationBuffer, implementing gopacket.SerializableLayer.
+// See the docs for gopacket.SerializableLayer for more info.
+func (d *BFD) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	data, err := b.PrependBytes(bfdMinimumRecordSizeInBytes)
+	if err != nil {
+		return err
+	}
+
+	// Pack the first few fields into the first 32 bits.
+	data[0] = byte(byte(d.Version<<5) | byte(d.Diagnostic))
+	h := uint8(0)
+	h |= (uint8(d.State) << 6)
+	h |= (uint8(bool2uint8(d.Poll)) << 5)
+	h |= (uint8(bool2uint8(d.Final)) << 4)
+	h |= (uint8(bool2uint8(d.ControlPlaneIndependent)) << 3)
+	h |= (uint8(bool2uint8(d.AuthPresent)) << 2)
+	h |= (uint8(bool2uint8(d.Demand)) << 1)
+	h |= uint8(bool2uint8(d.Multipoint))
+	data[1] = byte(h)
+	data[2] = byte(d.DetectMultiplier)
+	data[3] = byte(d.Length())
+
+	// The remaining fields can just be copied in big endian order.
+	binary.BigEndian.PutUint32(data[4:], uint32(d.MyDiscriminator))
+	binary.BigEndian.PutUint32(data[8:], uint32(d.YourDiscriminator))
+	binary.BigEndian.PutUint32(data[12:], uint32(d.DesiredMinTxInterval))
+	binary.BigEndian.PutUint32(data[16:], uint32(d.RequiredMinRxInterval))
+	binary.BigEndian.PutUint32(data[20:], uint32(d.RequiredMinEchoRxInterval))
+
+	if d.AuthPresent && (d.AuthHeader != nil) {
+		auth, err := b.AppendBytes(int(d.AuthHeader.Length()))
+		if err != nil {
+			return err
+		}
+
+		auth[0] = byte(d.AuthHeader.AuthType)
+		auth[1] = byte(d.AuthHeader.Length())
+		auth[2] = byte(d.AuthHeader.KeyID)
+
+		switch d.AuthHeader.AuthType {
+		case BFDAuthTypePassword:
+			copy(auth[3:], d.AuthHeader.Data)
+		case BFDAuthTypeKeyedMD5, BFDAuthTypeMeticulousKeyedMD5:
+			auth[3] = byte(0)
+			binary.BigEndian.PutUint32(auth[4:], uint32(d.AuthHeader.SequenceNumber))
+			copy(auth[8:], d.AuthHeader.Data)
+		case BFDAuthTypeKeyedSHA1, BFDAuthTypeMeticulousKeyedSHA1:
+			auth[3] = byte(0)
+			binary.BigEndian.PutUint32(auth[4:], uint32(d.AuthHeader.SequenceNumber))
+			copy(auth[8:], d.AuthHeader.Data)
+		}
+	}
+
+	return nil
+}
+
+// CanDecode returns a set of layers that BFD objects can decode.
+// As BFD objects can only decide the BFD layer, we can return just that layer.
+// Apparently a single layer type implements LayerClass.
+func (d *BFD) CanDecode() gopacket.LayerClass {
+	return LayerTypeBFD
+}
+
+// NextLayerType specifies the next layer that GoPacket should attempt to
+// analyse after this (BFD) layer. As BFD packets do not contain any payload
+// bytes, there are no further layers to analyse.
+func (d *BFD) NextLayerType() gopacket.LayerType {
+	return gopacket.LayerTypeZero
+}
+
+// Payload returns an empty byte slice as BFD packets do not carry a payload
+func (d *BFD) Payload() []byte {
+	return nil
+}
+
+// bool2uint8 converts a bool to uint8
+func bool2uint8(b bool) uint8 {
+	if b {
+		return 1
+	}
+	return 0
+}

vendor/github.com/google/gopacket/layers/cdp.go

@@ -0,0 +1,659 @@
+// Copyright 2012 Google, Inc. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+// Enum types courtesy of...
+//   http://search.cpan.org/~mchapman/Net-CDP-0.09/lib/Net/CDP.pm
+//   https://code.google.com/p/ladvd/
+//   http://anonsvn.wireshark.org/viewvc/releases/wireshark-1.8.6/epan/dissectors/packet-cdp.c
+
+package layers
+
+import (
+	"encoding/binary"
+	"errors"
+	"fmt"
+	"net"
+
+	"github.com/google/gopacket"
+)
+
+// CDPTLVType is the type of each TLV value in a CiscoDiscovery packet.
+type CDPTLVType uint16
+
+// CDPTLVType values.
+const (
+	CDPTLVDevID              CDPTLVType = 0x0001
+	CDPTLVAddress            CDPTLVType = 0x0002
+	CDPTLVPortID             CDPTLVType = 0x0003
+	CDPTLVCapabilities       CDPTLVType = 0x0004
+	CDPTLVVersion            CDPTLVType = 0x0005
+	CDPTLVPlatform           CDPTLVType = 0x0006
+	CDPTLVIPPrefix           CDPTLVType = 0x0007
+	CDPTLVHello              CDPTLVType = 0x0008
+	CDPTLVVTPDomain          CDPTLVType = 0x0009
+	CDPTLVNativeVLAN         CDPTLVType = 0x000a
+	CDPTLVFullDuplex         CDPTLVType = 0x000b
+	CDPTLVVLANReply          CDPTLVType = 0x000e
+	CDPTLVVLANQuery          CDPTLVType = 0x000f
+	CDPTLVPower              CDPTLVType = 0x0010
+	CDPTLVMTU                CDPTLVType = 0x0011
+	CDPTLVExtendedTrust      CDPTLVType = 0x0012
+	CDPTLVUntrustedCOS       CDPTLVType = 0x0013
+	CDPTLVSysName            CDPTLVType = 0x0014
+	CDPTLVSysOID             CDPTLVType = 0x0015
+	CDPTLVMgmtAddresses      CDPTLVType = 0x0016
+	CDPTLVLocation           CDPTLVType = 0x0017
+	CDPTLVExternalPortID     CDPTLVType = 0x0018
+	CDPTLVPowerRequested     CDPTLVType = 0x0019
+	CDPTLVPowerAvailable     CDPTLVType = 0x001a
+	CDPTLVPortUnidirectional CDPTLVType = 0x001b
+	CDPTLVEnergyWise         CDPTLVType = 0x001d
+	CDPTLVSparePairPOE       CDPTLVType = 0x001f
+)
+
+// CiscoDiscoveryValue is a TLV value inside a CiscoDiscovery packet layer.
+type CiscoDiscoveryValue struct {
+	Type   CDPTLVType
+	Length uint16
+	Value  []byte
+}
+
+// CiscoDiscovery is a packet layer containing the Cisco Discovery Protocol.
+// See http://www.cisco.com/univercd/cc/td/doc/product/lan/trsrb/frames.htm#31885
+type CiscoDiscovery struct {
+	BaseLayer
+	Version  byte
+	TTL      byte
+	Checksum uint16
+	Values   []CiscoDiscoveryValue
+}
+
+// CDPCapability is the set of capabilities advertised by a CDP device.
+type CDPCapability uint32
+
+// CDPCapability values.
+const (
+	CDPCapMaskRouter     CDPCapability = 0x0001
+	CDPCapMaskTBBridge   CDPCapability = 0x0002
+	CDPCapMaskSPBridge   CDPCapability = 0x0004
+	CDPCapMaskSwitch     CDPCapability = 0x0008
+	CDPCapMaskHost       CDPCapability = 0x0010
+	CDPCapMaskIGMPFilter CDPCapability = 0x0020
+	CDPCapMaskRepeater   CDPCapability = 0x0040
+	CDPCapMaskPhone      CDPCapability = 0x0080
+	CDPCapMaskRemote     CDPCapability = 0x0100
+)
+
+// CDPCapabilities represents the capabilities of a device
+type CDPCapabilities struct {
+	L3Router        bool
+	TBBridge        bool
+	SPBridge        bool
+	L2Switch        bool
+	IsHost          bool
+	IGMPFilter      bool
+	L1Repeater      bool
+	IsPhone         bool
+	RemotelyManaged bool
+}
+
+// CDP Power-over-Ethernet values.
+const (
+	CDPPoEFourWire  byte = 0x01
+	CDPPoEPDArch    byte = 0x02
+	CDPPoEPDRequest byte = 0x04
+	CDPPoEPSE       byte = 0x08
+)
+
+// CDPSparePairPoE provides information on PoE.
+type CDPSparePairPoE struct {
+	PSEFourWire  bool // Supported / Not supported
+	PDArchShared bool // Shared / Independent
+	PDRequestOn  bool // On / Off
+	PSEOn        bool // On / Off
+}
+
+// CDPVLANDialogue encapsulates a VLAN Query/Reply
+type CDPVLANDialogue struct {
+	ID   uint8
+	VLAN uint16
+}
+
+// CDPPowerDialogue encapsulates a Power Query/Reply
+type CDPPowerDialogue struct {
+	ID     uint16
+	MgmtID uint16
+	Values []uint32
+}
+
+// CDPLocation provides location information for a CDP device.
+type CDPLocation struct {
+	Type     uint8 // Undocumented
+	Location string
+}
+
+// CDPHello is a Cisco Hello message (undocumented, hence the "Unknown" fields)
+type CDPHello struct {
+	OUI              []byte
+	ProtocolID       uint16
+	ClusterMaster    net.IP
+	Unknown1         net.IP
+	Version          byte
+	SubVersion       byte
+	Status           byte
+	Unknown2         byte
+	ClusterCommander net.HardwareAddr
+	SwitchMAC        net.HardwareAddr
+	Unknown3         byte
+	ManagementVLAN   uint16
+}
+
+// CDPEnergyWiseSubtype is used within CDP to define TLV values.
+type CDPEnergyWiseSubtype uint32
+
+// CDPEnergyWiseSubtype values.
+const (
+	CDPEnergyWiseRole    CDPEnergyWiseSubtype = 0x00000007
+	CDPEnergyWiseDomain  CDPEnergyWiseSubtype = 0x00000008
+	CDPEnergyWiseName    CDPEnergyWiseSubtype = 0x00000009
+	CDPEnergyWiseReplyTo CDPEnergyWiseSubtype = 0x00000017
+)
+
+// CDPEnergyWise is used by CDP to monitor and control power usage.
+type CDPEnergyWise struct {
+	EncryptedData  []byte
+	Unknown1       uint32
+	SequenceNumber uint32
+	ModelNumber    string
+	Unknown2       uint16
+	HardwareID     string
+	SerialNum      string
+	Unknown3       []byte
+	Role           string
+	Domain         string
+	Name           string
+	ReplyUnknown1  []byte
+	ReplyPort      []byte
+	ReplyAddress   []byte
+	ReplyUnknown2  []byte
+	ReplyUnknown3  []byte
+}
+
+// CiscoDiscoveryInfo represents the decoded details for a set of CiscoDiscoveryValues
+type CiscoDiscoveryInfo struct {
+	BaseLayer
+	CDPHello
+	DeviceID         string
+	Addresses        []net.IP
+	PortID           string
+	Capabilities     CDPCapabilities
+	Version          string
+	Platform         string
+	IPPrefixes       []net.IPNet
+	VTPDomain        string
+	NativeVLAN       uint16
+	FullDuplex       bool
+	VLANReply        CDPVLANDialogue
+	VLANQuery        CDPVLANDialogue
+	PowerConsumption uint16
+	MTU              uint32
+	ExtendedTrust    uint8
+	UntrustedCOS     uint8
+	SysName          string
+	SysOID           string
+	MgmtAddresses    []net.IP
+	Location         CDPLocation
+	PowerRequest     CDPPowerDialogue
+	PowerAvailable   CDPPowerDialogue
+	SparePairPoe     CDPSparePairPoE
+	EnergyWise       CDPEnergyWise
+	Unknown          []CiscoDiscoveryValue
+}
+
+// LayerType returns gopacket.LayerTypeCiscoDiscovery.
+func (c *CiscoDiscovery) LayerType() gopacket.LayerType {
+	return LayerTypeCiscoDiscovery
+}
+
+func decodeCiscoDiscovery(data []byte, p gopacket.PacketBuilder) error {
+	c := &CiscoDiscovery{
+		Version:  data[0],
+		TTL:      data[1],
+		Checksum: binary.BigEndian.Uint16(data[2:4]),
+	}
+	if c.Version != 1 && c.Version != 2 {
+		return fmt.Errorf("Invalid CiscoDiscovery version number %d", c.Version)
+	}
+	var err error
+	c.Values, err = decodeCiscoDiscoveryTLVs(data[4:], p)
+	if err != nil {
+		return err
+	}
+	c.Contents = data[0:4]
+	c.Payload = data[4:]
+	p.AddLayer(c)
+	return p.NextDecoder(gopacket.DecodeFunc(decodeCiscoDiscoveryInfo))
+}
+
+// LayerType returns gopacket.LayerTypeCiscoDiscoveryInfo.
+func (c *CiscoDiscoveryInfo) LayerType() gopacket.LayerType {
+	return LayerTypeCiscoDiscoveryInfo
+}
+
+func decodeCiscoDiscoveryTLVs(data []byte, p gopacket.PacketBuilder) (values []CiscoDiscoveryValue, err error) {
+	for len(data) > 0 {
+		if len(data) < 4 {
+			p.SetTruncated()
+			return nil, errors.New("CDP TLV < 4 bytes")
+		}
+		val := CiscoDiscoveryValue{
+			Type:   CDPTLVType(binary.BigEndian.Uint16(data[:2])),
+			Length: binary.BigEndian.Uint16(data[2:4]),
+		}
+		if val.Length < 4 {
+			err = fmt.Errorf("Invalid CiscoDiscovery value length %d", val.Length)
+			break
+		} else if len(data) < int(val.Length) {
+			p.SetTruncated()
+			return nil, fmt.Errorf("CDP TLV < length %d", val.Length)
+		}
+		val.Value = data[4:val.Length]
+		values = append(values, val)
+		data = data[val.Length:]
+	}
+	return
+}
+
+func decodeCiscoDiscoveryInfo(data []byte, p gopacket.PacketBuilder) error {
+	var err error
+	info := &CiscoDiscoveryInfo{BaseLayer: BaseLayer{Contents: data}}
+	p.AddLayer(info)
+	values, err := decodeCiscoDiscoveryTLVs(data, p)
+	if err != nil { // Unlikely, as parent decode will fail, but better safe...
+		return err
+	}
+	for _, val := range values {
+		switch val.Type {
+		case CDPTLVDevID:
+			info.DeviceID = string(val.Value)
+		case CDPTLVAddress:
+			if err = checkCDPTLVLen(val, 4); err != nil {
+				return err
+			}
+			info.Addresses, err = decodeAddresses(val.Value)
+			if err != nil {
+				return err
+			}
+		case CDPTLVPortID:
+			info.PortID = string(val.Value)
+		case CDPTLVCapabilities:
+			if err = checkCDPTLVLen(val, 4); err != nil {
+				return err
+			}
+			val := CDPCapability(binary.BigEndian.Uint32(val.Value[0:4]))
+			info.Capabilities.L3Router = (val&CDPCapMaskRouter > 0)
+			info.Capabilities.TBBridge = (val&CDPCapMaskTBBridge > 0)
+			info.Capabilities.SPBridge = (val&CDPCapMaskSPBridge > 0)
+			info.Capabilities.L2Switch = (val&CDPCapMaskSwitch > 0)
+			info.Capabilities.IsHost = (val&CDPCapMaskHost > 0)
+			info.Capabilities.IGMPFilter = (val&CDPCapMaskIGMPFilter > 0)
+			info.Capabilities.L1Repeater = (val&CDPCapMaskRepeater > 0)
+			info.Capabilities.IsPhone = (val&CDPCapMaskPhone > 0)
+			info.Capabilities.RemotelyManaged = (val&CDPCapMaskRemote > 0)
+		case CDPTLVVersion:
+			info.Version = string(val.Value)
+		case CDPTLVPlatform:
+			info.Platform = string(val.Value)
+		case CDPTLVIPPrefix:
+			v := val.Value
+			l := len(v)
+			if l%5 == 0 && l >= 5 {
+				for len(v) > 0 {
+					_, ipnet, _ := net.ParseCIDR(fmt.Sprintf("%d.%d.%d.%d/%d", v[0], v[1], v[2], v[3], v[4]))
+					info.IPPrefixes = append(info.IPPrefixes, *ipnet)
+					v = v[5:]
+				}
+			} else {
+				return fmt.Errorf("Invalid TLV %v length %d", val.Type, len(val.Value))
+			}
+		case CDPTLVHello:
+			if err = checkCDPTLVLen(val, 32); err != nil {
+				return err
+			}
+			v := val.Value
+			info.CDPHello.OUI = v[0:3]
+			info.CDPHello.ProtocolID = binary.BigEndian.Uint16(v[3:5])
+			info.CDPHello.ClusterMaster = v[5:9]
+			info.CDPHello.Unknown1 = v[9:13]
+			info.CDPHello.Version = v[13]
+			info.CDPHello.SubVersion = v[14]
+			info.CDPHello.Status = v[15]
+			info.CDPHello.Unknown2 = v[16]
+			info.CDPHello.ClusterCommander = v[17:23]
+			info.CDPHello.SwitchMAC = v[23:29]
+			info.CDPHello.Unknown3 = v[29]
+			info.CDPHello.ManagementVLAN = binary.BigEndian.Uint16(v[30:32])
+		case CDPTLVVTPDomain:
+			info.VTPDomain = string(val.Value)
+		case CDPTLVNativeVLAN:
+			if err = checkCDPTLVLen(val, 2); err != nil {
+				return err
+			}
+			info.NativeVLAN = binary.BigEndian.Uint16(val.Value[0:2])
+		case CDPTLVFullDuplex:
+			if err = checkCDPTLVLen(val, 1); err != nil {
+				return err
+			}
+			info.FullDuplex = (val.Value[0] == 1)
+		case CDPTLVVLANReply:
+			if err = checkCDPTLVLen(val, 3); err != nil {
+				return err
+			}
+			info.VLANReply.ID = uint8(val.Value[0])
+			info.VLANReply.VLAN = binary.BigEndian.Uint16(val.Value[1:3])
+		case CDPTLVVLANQuery:
+			if err = checkCDPTLVLen(val, 3); err != nil {
+				return err
+			}
+			info.VLANQuery.ID = uint8(val.Value[0])
+			info.VLANQuery.VLAN = binary.BigEndian.Uint16(val.Value[1:3])
+		case CDPTLVPower:
+			if err = checkCDPTLVLen(val, 2); err != nil {
+				return err
+			}
+			info.PowerConsumption = binary.BigEndian.Uint16(val.Value[0:2])
+		case CDPTLVMTU:
+			if err = checkCDPTLVLen(val, 4); err != nil {
+				return err
+			}
+			info.MTU = binary.BigEndian.Uint32(val.Value[0:4])
+		case CDPTLVExtendedTrust:
+			if err = checkCDPTLVLen(val, 1); err != nil {
+				return err
+			}
+			info.ExtendedTrust = uint8(val.Value[0])
+		case CDPTLVUntrustedCOS:
+			if err = checkCDPTLVLen(val, 1); err != nil {
+				return err
+			}
+			info.UntrustedCOS = uint8(val.Value[0])
+		case CDPTLVSysName:
+			info.SysName = string(val.Value)
+		case CDPTLVSysOID:
+			info.SysOID = string(val.Value)
+		case CDPTLVMgmtAddresses:
+			if err = checkCDPTLVLen(val, 4); err != nil {
+				return err
+			}
+			info.MgmtAddresses, err = decodeAddresses(val.Value)
+			if err != nil {
+				return err
+			}
+		case CDPTLVLocation:
+			if err = checkCDPTLVLen(val, 2); err != nil {
+				return err
+			}
+			info.Location.Type = uint8(val.Value[0])
+			info.Location.Location = string(val.Value[1:])
+
+			//		case CDPTLVLExternalPortID:
+			//			Undocumented
+		case CDPTLVPowerRequested:
+			if err = checkCDPTLVLen(val, 4); err != nil {
+				return err
+			}
+			info.PowerRequest.ID = binary.BigEndian.Uint16(val.Value[0:2])
+			info.PowerRequest.MgmtID = binary.BigEndian.Uint16(val.Value[2:4])
+			for n := 4; n < len(val.Value); n += 4 {
+				info.PowerRequest.Values = append(info.PowerRequest.Values, binary.BigEndian.Uint32(val.Value[n:n+4]))
+			}
+		case CDPTLVPowerAvailable:
+			if err = checkCDPTLVLen(val, 4); err != nil {
+				return err
+			}
+			info.PowerAvailable.ID = binary.BigEndian.Uint16(val.Value[0:2])
+			info.PowerAvailable.MgmtID = binary.BigEndian.Uint16(val.Value[2:4])
+			for n := 4; n < len(val.Value); n += 4 {
+				info.PowerAvailable.Values = append(info.PowerAvailable.Values, binary.BigEndian.Uint32(val.Value[n:n+4]))
+			}
+			//		case CDPTLVPortUnidirectional
+			//			Undocumented
+		case CDPTLVEnergyWise:
+			if err = checkCDPTLVLen(val, 72); err != nil {
+				return err
+			}
+			info.EnergyWise.EncryptedData = val.Value[0:20]
+			info.EnergyWise.Unknown1 = binary.BigEndian.Uint32(val.Value[20:24])
+			info.EnergyWise.SequenceNumber = binary.BigEndian.Uint32(val.Value[24:28])
+			info.EnergyWise.ModelNumber = string(val.Value[28:44])
+			info.EnergyWise.Unknown2 = binary.BigEndian.Uint16(val.Value[44:46])
+			info.EnergyWise.HardwareID = string(val.Value[46:49])
+			info.EnergyWise.SerialNum = string(val.Value[49:60])
+			info.EnergyWise.Unknown3 = val.Value[60:68]
+			tlvLen := binary.BigEndian.Uint16(val.Value[68:70])
+			tlvNum := binary.BigEndian.Uint16(val.Value[70:72])
+			data := val.Value[72:]
+			if len(data) < int(tlvLen) {
+				return fmt.Errorf("Invalid TLV length %d vs %d", tlvLen, len(data))
+			}
+			numSeen := 0
+			for len(data) > 8 {
+				numSeen++
+				if numSeen > int(tlvNum) { // Too many TLV's ?
+					return fmt.Errorf("Too many TLV's - wanted %d, saw %d", tlvNum, numSeen)
+				}
+				tType := CDPEnergyWiseSubtype(binary.BigEndian.Uint32(data[0:4]))
+				tLen := int(binary.BigEndian.Uint32(data[4:8]))
+				if tLen > len(data)-8 {
+					return fmt.Errorf("Invalid TLV length %d vs %d", tLen, len(data)-8)
+				}
+				data = data[8:]
+				switch tType {
+				case CDPEnergyWiseRole:
+					info.EnergyWise.Role = string(data[:])
+				case CDPEnergyWiseDomain:
+					info.EnergyWise.Domain = string(data[:])
+				case CDPEnergyWiseName:
+					info.EnergyWise.Name = string(data[:])
+				case CDPEnergyWiseReplyTo:
+					if len(data) >= 18 {
+						info.EnergyWise.ReplyUnknown1 = data[0:2]
+						info.EnergyWise.ReplyPort = data[2:4]
+						info.EnergyWise.ReplyAddress = data[4:8]
+						info.EnergyWise.ReplyUnknown2 = data[8:10]
+						info.EnergyWise.ReplyUnknown3 = data[10:14]
+					}
+				}
+				data = data[tLen:]
+			}
+		case CDPTLVSparePairPOE:
+			if err = checkCDPTLVLen(val, 1); err != nil {
+				return err
+			}
+			v := val.Value[0]
+			info.SparePairPoe.PSEFourWire = (v&CDPPoEFourWire > 0)
+			info.SparePairPoe.PDArchShared = (v&CDPPoEPDArch > 0)
+			info.SparePairPoe.PDRequestOn = (v&CDPPoEPDRequest > 0)
+			info.SparePairPoe.PSEOn = (v&CDPPoEPSE > 0)
+		default:
+			info.Unknown = append(info.Unknown, val)
+		}
+	}
+	return nil
+}
+
+// CDP Protocol Types
+const (
+	CDPProtocolTypeNLPID byte = 1
+	CDPProtocolType802_2 byte = 2
+)
+
+// CDPAddressType is used to define TLV values within CDP addresses.
+type CDPAddressType uint64
+
+// CDP Address types.
+const (
+	CDPAddressTypeCLNP      CDPAddressType = 0x81
+	CDPAddressTypeIPV4      CDPAddressType = 0xcc
+	CDPAddressTypeIPV6      CDPAddressType = 0xaaaa030000000800
+	CDPAddressTypeDECNET    CDPAddressType = 0xaaaa030000006003
+	CDPAddressTypeAPPLETALK CDPAddressType = 0xaaaa03000000809b
+	CDPAddressTypeIPX       CDPAddressType = 0xaaaa030000008137
+	CDPAddressTypeVINES     CDPAddressType = 0xaaaa0300000080c4
+	CDPAddressTypeXNS       CDPAddressType = 0xaaaa030000000600
+	CDPAddressTypeAPOLLO    CDPAddressType = 0xaaaa030000008019
+)
+
+func decodeAddresses(v []byte) (addresses []net.IP, err error) {
+	numaddr := int(binary.BigEndian.Uint32(v[0:4]))
+	if numaddr < 1 {
+		return nil, fmt.Errorf("Invalid Address TLV number %d", numaddr)
+	}
+	v = v[4:]
+	if len(v) < numaddr*8 {
+		return nil, fmt.Errorf("Invalid Address TLV length %d", len(v))
+	}
+	for i := 0; i < numaddr; i++ {
+		prottype := v[0]
+		if prottype != CDPProtocolTypeNLPID && prottype != CDPProtocolType802_2 { // invalid protocol type
+			return nil, fmt.Errorf("Invalid Address Protocol %d", prottype)
+		}
+		protlen := int(v[1])
+		if (prottype == CDPProtocolTypeNLPID && protlen != 1) ||
+			(prottype == CDPProtocolType802_2 && protlen != 3 && protlen != 8) { // invalid length
+			return nil, fmt.Errorf("Invalid Address Protocol length %d", protlen)
+		}
+		plen := make([]byte, 8)
+		copy(plen[8-protlen:], v[2:2+protlen])
+		protocol := CDPAddressType(binary.BigEndian.Uint64(plen))
+		v = v[2+protlen:]
+		addrlen := binary.BigEndian.Uint16(v[0:2])
+		ab := v[2 : 2+addrlen]
+		if protocol == CDPAddressTypeIPV4 && addrlen == 4 {
+			addresses = append(addresses, net.IPv4(ab[0], ab[1], ab[2], ab[3]))
+		} else if protocol == CDPAddressTypeIPV6 && addrlen == 16 {
+			addresses = append(addresses, net.IP(ab))
+		} else {
+			// only handle IPV4 & IPV6 for now
+		}
+		v = v[2+addrlen:]
+		if len(v) < 8 {
+			break
+		}
+	}
+	return
+}
+
+func (t CDPTLVType) String() (s string) {
+	switch t {
+	case CDPTLVDevID:
+		s = "Device ID"
+	case CDPTLVAddress:
+		s = "Addresses"
+	case CDPTLVPortID:
+		s = "Port ID"
+	case CDPTLVCapabilities:
+		s = "Capabilities"
+	case CDPTLVVersion:
+		s = "Software Version"
+	case CDPTLVPlatform:
+		s = "Platform"
+	case CDPTLVIPPrefix:
+		s = "IP Prefix"
+	case CDPTLVHello:
+		s = "Protocol Hello"
+	case CDPTLVVTPDomain:
+		s = "VTP Management Domain"
+	case CDPTLVNativeVLAN:
+		s = "Native VLAN"
+	case CDPTLVFullDuplex:
+		s = "Full Duplex"
+	case CDPTLVVLANReply:
+		s = "VoIP VLAN Reply"
+	case CDPTLVVLANQuery:
+		s = "VLANQuery"
+	case CDPTLVPower:
+		s = "Power consumption"
+	case CDPTLVMTU:
+		s = "MTU"
+	case CDPTLVExtendedTrust:
+		s = "Extended Trust Bitmap"
+	case CDPTLVUntrustedCOS:
+		s = "Untrusted Port CoS"
+	case CDPTLVSysName:
+		s = "System Name"
+	case CDPTLVSysOID:
+		s = "System OID"
+	case CDPTLVMgmtAddresses:
+		s = "Management Addresses"
+	case CDPTLVLocation:
+		s = "Location"
+	case CDPTLVExternalPortID:
+		s = "External Port ID"
+	case CDPTLVPowerRequested:
+		s = "Power Requested"
+	case CDPTLVPowerAvailable:
+		s = "Power Available"
+	case CDPTLVPortUnidirectional:
+		s = "Port Unidirectional"
+	case CDPTLVEnergyWise:
+		s = "Energy Wise"
+	case CDPTLVSparePairPOE:
+		s = "Spare Pair POE"
+	default:
+		s = "Unknown"
+	}
+	return
+}
+
+func (a CDPAddressType) String() (s string) {
+	switch a {
+	case CDPAddressTypeCLNP:
+		s = "Connectionless Network Protocol"
+	case CDPAddressTypeIPV4:
+		s = "IPv4"
+	case CDPAddressTypeIPV6:
+		s = "IPv6"
+	case CDPAddressTypeDECNET:
+		s = "DECnet Phase IV"
+	case CDPAddressTypeAPPLETALK:
+		s = "Apple Talk"
+	case CDPAddressTypeIPX:
+		s = "Novell IPX"
+	case CDPAddressTypeVINES:
+		s = "Banyan VINES"
+	case CDPAddressTypeXNS:
+		s = "Xerox Network Systems"
+	case CDPAddressTypeAPOLLO:
+		s = "Apollo"
+	default:
+		s = "Unknown"
+	}
+	return
+}
+
+func (t CDPEnergyWiseSubtype) String() (s string) {
+	switch t {
+	case CDPEnergyWiseRole:
+		s = "Role"
+	case CDPEnergyWiseDomain:
+		s = "Domain"
+	case CDPEnergyWiseName:
+		s = "Name"
+	case CDPEnergyWiseReplyTo:
+		s = "ReplyTo"
+	default:
+		s = "Unknown"
+	}
+	return
+}
+
+func checkCDPTLVLen(v CiscoDiscoveryValue, l int) (err error) {
+	if len(v.Value) < l {
+		err = fmt.Errorf("Invalid TLV %v length %d", v.Type, len(v.Value))
+	}
+	return
+}

vendor/github.com/google/gopacket/layers/ctp.go

@@ -0,0 +1,109 @@
+// Copyright 2012 Google, Inc. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+package layers
+
+import (
+	"encoding/binary"
+	"fmt"
+	"github.com/google/gopacket"
+)
+
+// EthernetCTPFunction is the function code used by the EthernetCTP protocol to identify each
+// EthernetCTP layer.
+type EthernetCTPFunction uint16
+
+// EthernetCTPFunction values.
+const (
+	EthernetCTPFunctionReply       EthernetCTPFunction = 1
+	EthernetCTPFunctionForwardData EthernetCTPFunction = 2
+)
+
+// EthernetCTP implements the EthernetCTP protocol, see http://www.mit.edu/people/jhawk/ctp.html.
+// We split EthernetCTP up into the top-level EthernetCTP layer, followed by zero or more
+// EthernetCTPForwardData layers, followed by a final EthernetCTPReply layer.
+type EthernetCTP struct {
+	BaseLayer
+	SkipCount uint16
+}
+
+// LayerType returns gopacket.LayerTypeEthernetCTP.
+func (c *EthernetCTP) LayerType() gopacket.LayerType {
+	return LayerTypeEthernetCTP
+}
+
+// EthernetCTPForwardData is the ForwardData layer inside EthernetCTP.  See EthernetCTP's docs for more
+// details.
+type EthernetCTPForwardData struct {
+	BaseLayer
+	Function       EthernetCTPFunction
+	ForwardAddress []byte
+}
+
+// LayerType returns gopacket.LayerTypeEthernetCTPForwardData.
+func (c *EthernetCTPForwardData) LayerType() gopacket.LayerType {
+	return LayerTypeEthernetCTPForwardData
+}
+
+// ForwardEndpoint returns the EthernetCTPForwardData ForwardAddress as an endpoint.
+func (c *EthernetCTPForwardData) ForwardEndpoint() gopacket.Endpoint {
+	return gopacket.NewEndpoint(EndpointMAC, c.ForwardAddress)
+}
+
+// EthernetCTPReply is the Reply layer inside EthernetCTP.  See EthernetCTP's docs for more details.
+type EthernetCTPReply struct {
+	BaseLayer
+	Function      EthernetCTPFunction
+	ReceiptNumber uint16
+	Data          []byte
+}
+
+// LayerType returns gopacket.LayerTypeEthernetCTPReply.
+func (c *EthernetCTPReply) LayerType() gopacket.LayerType {
+	return LayerTypeEthernetCTPReply
+}
+
+// Payload returns the EthernetCTP reply's Data bytes.
+func (c *EthernetCTPReply) Payload() []byte { return c.Data }
+
+func decodeEthernetCTP(data []byte, p gopacket.PacketBuilder) error {
+	c := &EthernetCTP{
+		SkipCount: binary.LittleEndian.Uint16(data[:2]),
+		BaseLayer: BaseLayer{data[:2], data[2:]},
+	}
+	if c.SkipCount%2 != 0 {
+		return fmt.Errorf("EthernetCTP skip count is odd: %d", c.SkipCount)
+	}
+	p.AddLayer(c)
+	return p.NextDecoder(gopacket.DecodeFunc(decodeEthernetCTPFromFunctionType))
+}
+
+// decodeEthernetCTPFromFunctionType reads in the first 2 bytes to determine the EthernetCTP
+// layer type to decode next, then decodes based on that.
+func decodeEthernetCTPFromFunctionType(data []byte, p gopacket.PacketBuilder) error {
+	function := EthernetCTPFunction(binary.LittleEndian.Uint16(data[:2]))
+	switch function {
+	case EthernetCTPFunctionReply:
+		reply := &EthernetCTPReply{
+			Function:      function,
+			ReceiptNumber: binary.LittleEndian.Uint16(data[2:4]),
+			Data:          data[4:],
+			BaseLayer:     BaseLayer{data, nil},
+		}
+		p.AddLayer(reply)
+		p.SetApplicationLayer(reply)
+		return nil
+	case EthernetCTPFunctionForwardData:
+		forward := &EthernetCTPForwardData{
+			Function:       function,
+			ForwardAddress: data[2:8],
+			BaseLayer:      BaseLayer{data[:8], data[8:]},
+		}
+		p.AddLayer(forward)
+		return p.NextDecoder(gopacket.DecodeFunc(decodeEthernetCTPFromFunctionType))
+	}
+	return fmt.Errorf("Unknown EthernetCTP function type %v", function)
+}

vendor/github.com/google/gopacket/layers/dhcpv4.go

@@ -0,0 +1,592 @@
+// Copyright 2016 Google, Inc. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+package layers
+
+import (
+	"bytes"
+	"encoding/binary"
+	"fmt"
+	"net"
+
+	"github.com/google/gopacket"
+)
+
+// DHCPOp rerprents a bootp operation
+type DHCPOp byte
+
+// bootp operations
+const (
+	DHCPOpRequest DHCPOp = 1
+	DHCPOpReply   DHCPOp = 2
+)
+
+// String returns a string version of a DHCPOp.
+func (o DHCPOp) String() string {
+	switch o {
+	case DHCPOpRequest:
+		return "Request"
+	case DHCPOpReply:
+		return "Reply"
+	default:
+		return "Unknown"
+	}
+}
+
+// DHCPMsgType represents a DHCP operation
+type DHCPMsgType byte
+
+// Constants that represent DHCP operations
+const (
+	DHCPMsgTypeUnspecified DHCPMsgType = iota
+	DHCPMsgTypeDiscover
+	DHCPMsgTypeOffer
+	DHCPMsgTypeRequest
+	DHCPMsgTypeDecline
+	DHCPMsgTypeAck
+	DHCPMsgTypeNak
+	DHCPMsgTypeRelease
+	DHCPMsgTypeInform
+)
+
+// String returns a string version of a DHCPMsgType.
+func (o DHCPMsgType) String() string {
+	switch o {
+	case DHCPMsgTypeUnspecified:
+		return "Unspecified"
+	case DHCPMsgTypeDiscover:
+		return "Discover"
+	case DHCPMsgTypeOffer:
+		return "Offer"
+	case DHCPMsgTypeRequest:
+		return "Request"
+	case DHCPMsgTypeDecline:
+		return "Decline"
+	case DHCPMsgTypeAck:
+		return "Ack"
+	case DHCPMsgTypeNak:
+		return "Nak"
+	case DHCPMsgTypeRelease:
+		return "Release"
+	case DHCPMsgTypeInform:
+		return "Inform"
+	default:
+		return "Unknown"
+	}
+}
+
+//DHCPMagic is the RFC 2131 "magic cooke" for DHCP.
+var DHCPMagic uint32 = 0x63825363
+
+// DHCPv4 contains data for a single DHCP packet.
+type DHCPv4 struct {
+	BaseLayer
+	Operation    DHCPOp
+	HardwareType LinkType
+	HardwareLen  uint8
+	HardwareOpts uint8
+	Xid          uint32
+	Secs         uint16
+	Flags        uint16
+	ClientIP     net.IP
+	YourClientIP net.IP
+	NextServerIP net.IP
+	RelayAgentIP net.IP
+	ClientHWAddr net.HardwareAddr
+	ServerName   []byte
+	File         []byte
+	Options      DHCPOptions
+}
+
+// DHCPOptions is used to get nicely printed option lists which would normally
+// be cut off after 5 options.
+type DHCPOptions []DHCPOption
+
+// String returns a string version of the options list.
+func (o DHCPOptions) String() string {
+	buf := &bytes.Buffer{}
+	buf.WriteByte('[')
+	for i, opt := range o {
+		buf.WriteString(opt.String())
+		if i+1 != len(o) {
+			buf.WriteString(", ")
+		}
+	}
+	buf.WriteByte(']')
+	return buf.String()
+}
+
+// LayerType returns gopacket.LayerTypeDHCPv4
+func (d *DHCPv4) LayerType() gopacket.LayerType { return LayerTypeDHCPv4 }
+
+// DecodeFromBytes decodes the given bytes into this layer.
+func (d *DHCPv4) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+	if len(data) < 240 {
+		df.SetTruncated()
+		return fmt.Errorf("DHCPv4 length %d too short", len(data))
+	}
+	d.Options = d.Options[:0]
+	d.Operation = DHCPOp(data[0])
+	d.HardwareType = LinkType(data[1])
+	d.HardwareLen = data[2]
+	d.HardwareOpts = data[3]
+	d.Xid = binary.BigEndian.Uint32(data[4:8])
+	d.Secs = binary.BigEndian.Uint16(data[8:10])
+	d.Flags = binary.BigEndian.Uint16(data[10:12])
+	d.ClientIP = net.IP(data[12:16])
+	d.YourClientIP = net.IP(data[16:20])
+	d.NextServerIP = net.IP(data[20:24])
+	d.RelayAgentIP = net.IP(data[24:28])
+	d.ClientHWAddr = net.HardwareAddr(data[28 : 28+d.HardwareLen])
+	d.ServerName = data[44:108]
+	d.File = data[108:236]
+	if binary.BigEndian.Uint32(data[236:240]) != DHCPMagic {
+		return InvalidMagicCookie
+	}
+
+	if len(data) <= 240 {
+		// DHCP Packet could have no option (??)
+		return nil
+	}
+
+	options := data[240:]
+
+	stop := len(options)
+	start := 0
+	for start < stop {
+		o := DHCPOption{}
+		if err := o.decode(options[start:]); err != nil {
+			return err
+		}
+		if o.Type == DHCPOptEnd {
+			break
+		}
+		d.Options = append(d.Options, o)
+		// Check if the option is a single byte pad
+		if o.Type == DHCPOptPad {
+			start++
+		} else {
+			start += int(o.Length) + 2
+		}
+	}
+
+	d.Contents = data
+
+	return nil
+}
+
+// Len returns the length of a DHCPv4 packet.
+func (d *DHCPv4) Len() uint16 {
+	n := uint16(240)
+	for _, o := range d.Options {
+		if o.Type == DHCPOptPad {
+			n++
+		} else {
+			n += uint16(o.Length) + 2
+		}
+	}
+	n++ // for opt end
+	return n
+}
+
+// SerializeTo writes the serialized form of this layer into the
+// SerializationBuffer, implementing gopacket.SerializableLayer.
+// See the docs for gopacket.SerializableLayer for more info.
+func (d *DHCPv4) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	plen := int(d.Len())
+
+	data, err := b.PrependBytes(plen)
+	if err != nil {
+		return err
+	}
+
+	data[0] = byte(d.Operation)
+	data[1] = byte(d.HardwareType)
+	if opts.FixLengths {
+		d.HardwareLen = uint8(len(d.ClientHWAddr))
+	}
+	data[2] = d.HardwareLen
+	data[3] = d.HardwareOpts
+	binary.BigEndian.PutUint32(data[4:8], d.Xid)
+	binary.BigEndian.PutUint16(data[8:10], d.Secs)
+	binary.BigEndian.PutUint16(data[10:12], d.Flags)
+	copy(data[12:16], d.ClientIP.To4())
+	copy(data[16:20], d.YourClientIP.To4())
+	copy(data[20:24], d.NextServerIP.To4())
+	copy(data[24:28], d.RelayAgentIP.To4())
+	copy(data[28:44], d.ClientHWAddr)
+	copy(data[44:108], d.ServerName)
+	copy(data[108:236], d.File)
+	binary.BigEndian.PutUint32(data[236:240], DHCPMagic)
+
+	if len(d.Options) > 0 {
+		offset := 240
+		for _, o := range d.Options {
+			if err := o.encode(data[offset:]); err != nil {
+				return err
+			}
+			// A pad option is only a single byte
+			if o.Type == DHCPOptPad {
+				offset++
+			} else {
+				offset += 2 + len(o.Data)
+			}
+		}
+		optend := NewDHCPOption(DHCPOptEnd, nil)
+		if err := optend.encode(data[offset:]); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// CanDecode returns the set of layer types that this DecodingLayer can decode.
+func (d *DHCPv4) CanDecode() gopacket.LayerClass {
+	return LayerTypeDHCPv4
+}
+
+// NextLayerType returns the layer type contained by this DecodingLayer.
+func (d *DHCPv4) NextLayerType() gopacket.LayerType {
+	return gopacket.LayerTypePayload
+}
+
+func decodeDHCPv4(data []byte, p gopacket.PacketBuilder) error {
+	dhcp := &DHCPv4{}
+	err := dhcp.DecodeFromBytes(data, p)
+	if err != nil {
+		return err
+	}
+	p.AddLayer(dhcp)
+	return p.NextDecoder(gopacket.LayerTypePayload)
+}
+
+// DHCPOpt represents a DHCP option or parameter from RFC-2132
+type DHCPOpt byte
+
+// Constants for the DHCPOpt options.
+const (
+	DHCPOptPad                   DHCPOpt = 0
+	DHCPOptSubnetMask            DHCPOpt = 1   // 4, net.IP
+	DHCPOptTimeOffset            DHCPOpt = 2   // 4, int32 (signed seconds from UTC)
+	DHCPOptRouter                DHCPOpt = 3   // n*4, [n]net.IP
+	DHCPOptTimeServer            DHCPOpt = 4   // n*4, [n]net.IP
+	DHCPOptNameServer            DHCPOpt = 5   // n*4, [n]net.IP
+	DHCPOptDNS                   DHCPOpt = 6   // n*4, [n]net.IP
+	DHCPOptLogServer             DHCPOpt = 7   // n*4, [n]net.IP
+	DHCPOptCookieServer          DHCPOpt = 8   // n*4, [n]net.IP
+	DHCPOptLPRServer             DHCPOpt = 9   // n*4, [n]net.IP
+	DHCPOptImpressServer         DHCPOpt = 10  // n*4, [n]net.IP
+	DHCPOptResLocServer          DHCPOpt = 11  // n*4, [n]net.IP
+	DHCPOptHostname              DHCPOpt = 12  // n, string
+	DHCPOptBootfileSize          DHCPOpt = 13  // 2, uint16
+	DHCPOptMeritDumpFile         DHCPOpt = 14  // >1, string
+	DHCPOptDomainName            DHCPOpt = 15  // n, string
+	DHCPOptSwapServer            DHCPOpt = 16  // n*4, [n]net.IP
+	DHCPOptRootPath              DHCPOpt = 17  // n, string
+	DHCPOptExtensionsPath        DHCPOpt = 18  // n, string
+	DHCPOptIPForwarding          DHCPOpt = 19  // 1, bool
+	DHCPOptSourceRouting         DHCPOpt = 20  // 1, bool
+	DHCPOptPolicyFilter          DHCPOpt = 21  // 8*n, [n]{net.IP/net.IP}
+	DHCPOptDatagramMTU           DHCPOpt = 22  // 2, uint16
+	DHCPOptDefaultTTL            DHCPOpt = 23  // 1, byte
+	DHCPOptPathMTUAgingTimeout   DHCPOpt = 24  // 4, uint32
+	DHCPOptPathPlateuTableOption DHCPOpt = 25  // 2*n, []uint16
+	DHCPOptInterfaceMTU          DHCPOpt = 26  // 2, uint16
+	DHCPOptAllSubsLocal          DHCPOpt = 27  // 1, bool
+	DHCPOptBroadcastAddr         DHCPOpt = 28  // 4, net.IP
+	DHCPOptMaskDiscovery         DHCPOpt = 29  // 1, bool
+	DHCPOptMaskSupplier          DHCPOpt = 30  // 1, bool
+	DHCPOptRouterDiscovery       DHCPOpt = 31  // 1, bool
+	DHCPOptSolicitAddr           DHCPOpt = 32  // 4, net.IP
+	DHCPOptStaticRoute           DHCPOpt = 33  // n*8, [n]{net.IP/net.IP} -- note the 2nd is router not mask
+	DHCPOptARPTrailers           DHCPOpt = 34  // 1, bool
+	DHCPOptARPTimeout            DHCPOpt = 35  // 4, uint32
+	DHCPOptEthernetEncap         DHCPOpt = 36  // 1, bool
+	DHCPOptTCPTTL                DHCPOpt = 37  // 1, byte
+	DHCPOptTCPKeepAliveInt       DHCPOpt = 38  // 4, uint32
+	DHCPOptTCPKeepAliveGarbage   DHCPOpt = 39  // 1, bool
+	DHCPOptNISDomain             DHCPOpt = 40  // n, string
+	DHCPOptNISServers            DHCPOpt = 41  // 4*n,  [n]net.IP
+	DHCPOptNTPServers            DHCPOpt = 42  // 4*n, [n]net.IP
+	DHCPOptVendorOption          DHCPOpt = 43  // n, [n]byte // may be encapsulated.
+	DHCPOptNetBIOSTCPNS          DHCPOpt = 44  // 4*n, [n]net.IP
+	DHCPOptNetBIOSTCPDDS         DHCPOpt = 45  // 4*n, [n]net.IP
+	DHCPOptNETBIOSTCPNodeType    DHCPOpt = 46  // 1, magic byte
+	DHCPOptNetBIOSTCPScope       DHCPOpt = 47  // n, string
+	DHCPOptXFontServer           DHCPOpt = 48  // n, string
+	DHCPOptXDisplayManager       DHCPOpt = 49  // n, string
+	DHCPOptRequestIP             DHCPOpt = 50  // 4, net.IP
+	DHCPOptLeaseTime             DHCPOpt = 51  // 4, uint32
+	DHCPOptExtOptions            DHCPOpt = 52  // 1, 1/2/3
+	DHCPOptMessageType           DHCPOpt = 53  // 1, 1-7
+	DHCPOptServerID              DHCPOpt = 54  // 4, net.IP
+	DHCPOptParamsRequest         DHCPOpt = 55  // n, []byte
+	DHCPOptMessage               DHCPOpt = 56  // n, 3
+	DHCPOptMaxMessageSize        DHCPOpt = 57  // 2, uint16
+	DHCPOptT1                    DHCPOpt = 58  // 4, uint32
+	DHCPOptT2                    DHCPOpt = 59  // 4, uint32
+	DHCPOptClassID               DHCPOpt = 60  // n, []byte
+	DHCPOptClientID              DHCPOpt = 61  // n >=  2, []byte
+	DHCPOptDomainSearch          DHCPOpt = 119 // n, string
+	DHCPOptSIPServers            DHCPOpt = 120 // n, url
+	DHCPOptClasslessStaticRoute  DHCPOpt = 121 //
+	DHCPOptEnd                   DHCPOpt = 255
+)
+
+// String returns a string version of a DHCPOpt.
+func (o DHCPOpt) String() string {
+	switch o {
+	case DHCPOptPad:
+		return "(padding)"
+	case DHCPOptSubnetMask:
+		return "SubnetMask"
+	case DHCPOptTimeOffset:
+		return "TimeOffset"
+	case DHCPOptRouter:
+		return "Router"
+	case DHCPOptTimeServer:
+		return "rfc868" // old time server protocol stringified to dissuade confusion w. NTP
+	case DHCPOptNameServer:
+		return "ien116" // obscure nameserver protocol stringified to dissuade confusion w. DNS
+	case DHCPOptDNS:
+		return "DNS"
+	case DHCPOptLogServer:
+		return "mitLCS" // MIT LCS server protocol yada yada w. Syslog
+	case DHCPOptCookieServer:
+		return "CookieServer"
+	case DHCPOptLPRServer:
+		return "LPRServer"
+	case DHCPOptImpressServer:
+		return "ImpressServer"
+	case DHCPOptResLocServer:
+		return "ResourceLocationServer"
+	case DHCPOptHostname:
+		return "Hostname"
+	case DHCPOptBootfileSize:
+		return "BootfileSize"
+	case DHCPOptMeritDumpFile:
+		return "MeritDumpFile"
+	case DHCPOptDomainName:
+		return "DomainName"
+	case DHCPOptSwapServer:
+		return "SwapServer"
+	case DHCPOptRootPath:
+		return "RootPath"
+	case DHCPOptExtensionsPath:
+		return "ExtensionsPath"
+	case DHCPOptIPForwarding:
+		return "IPForwarding"
+	case DHCPOptSourceRouting:
+		return "SourceRouting"
+	case DHCPOptPolicyFilter:
+		return "PolicyFilter"
+	case DHCPOptDatagramMTU:
+		return "DatagramMTU"
+	case DHCPOptDefaultTTL:
+		return "DefaultTTL"
+	case DHCPOptPathMTUAgingTimeout:
+		return "PathMTUAgingTimeout"
+	case DHCPOptPathPlateuTableOption:
+		return "PathPlateuTableOption"
+	case DHCPOptInterfaceMTU:
+		return "InterfaceMTU"
+	case DHCPOptAllSubsLocal:
+		return "AllSubsLocal"
+	case DHCPOptBroadcastAddr:
+		return "BroadcastAddress"
+	case DHCPOptMaskDiscovery:
+		return "MaskDiscovery"
+	case DHCPOptMaskSupplier:
+		return "MaskSupplier"
+	case DHCPOptRouterDiscovery:
+		return "RouterDiscovery"
+	case DHCPOptSolicitAddr:
+		return "SolicitAddr"
+	case DHCPOptStaticRoute:
+		return "StaticRoute"
+	case DHCPOptARPTrailers:
+		return "ARPTrailers"
+	case DHCPOptARPTimeout:
+		return "ARPTimeout"
+	case DHCPOptEthernetEncap:
+		return "EthernetEncap"
+	case DHCPOptTCPTTL:
+		return "TCPTTL"
+	case DHCPOptTCPKeepAliveInt:
+		return "TCPKeepAliveInt"
+	case DHCPOptTCPKeepAliveGarbage:
+		return "TCPKeepAliveGarbage"
+	case DHCPOptNISDomain:
+		return "NISDomain"
+	case DHCPOptNISServers:
+		return "NISServers"
+	case DHCPOptNTPServers:
+		return "NTPServers"
+	case DHCPOptVendorOption:
+		return "VendorOption"
+	case DHCPOptNetBIOSTCPNS:
+		return "NetBIOSOverTCPNS"
+	case DHCPOptNetBIOSTCPDDS:
+		return "NetBiosOverTCPDDS"
+	case DHCPOptNETBIOSTCPNodeType:
+		return "NetBIOSOverTCPNodeType"
+	case DHCPOptNetBIOSTCPScope:
+		return "NetBIOSOverTCPScope"
+	case DHCPOptXFontServer:
+		return "XFontServer"
+	case DHCPOptXDisplayManager:
+		return "XDisplayManager"
+	case DHCPOptEnd:
+		return "(end)"
+	case DHCPOptSIPServers:
+		return "SipServers"
+	case DHCPOptRequestIP:
+		return "RequestIP"
+	case DHCPOptLeaseTime:
+		return "LeaseTime"
+	case DHCPOptExtOptions:
+		return "ExtOpts"
+	case DHCPOptMessageType:
+		return "MessageType"
+	case DHCPOptServerID:
+		return "ServerID"
+	case DHCPOptParamsRequest:
+		return "ParamsRequest"
+	case DHCPOptMessage:
+		return "Message"
+	case DHCPOptMaxMessageSize:
+		return "MaxDHCPSize"
+	case DHCPOptT1:
+		return "Timer1"
+	case DHCPOptT2:
+		return "Timer2"
+	case DHCPOptClassID:
+		return "ClassID"
+	case DHCPOptClientID:
+		return "ClientID"
+	case DHCPOptDomainSearch:
+		return "DomainSearch"
+	case DHCPOptClasslessStaticRoute:
+		return "ClasslessStaticRoute"
+	default:
+		return "Unknown"
+	}
+}
+
+// DHCPOption rerpresents a DHCP option.
+type DHCPOption struct {
+	Type   DHCPOpt
+	Length uint8
+	Data   []byte
+}
+
+// String returns a string version of a DHCP Option.
+func (o DHCPOption) String() string {
+	switch o.Type {
+
+	case DHCPOptHostname, DHCPOptMeritDumpFile, DHCPOptDomainName, DHCPOptRootPath,
+		DHCPOptExtensionsPath, DHCPOptNISDomain, DHCPOptNetBIOSTCPScope, DHCPOptXFontServer,
+		DHCPOptXDisplayManager, DHCPOptMessage, DHCPOptDomainSearch: // string
+		return fmt.Sprintf("Option(%s:%s)", o.Type, string(o.Data))
+
+	case DHCPOptMessageType:
+		if len(o.Data) != 1 {
+			return fmt.Sprintf("Option(%s:INVALID)", o.Type)
+		}
+		return fmt.Sprintf("Option(%s:%s)", o.Type, DHCPMsgType(o.Data[0]))
+
+	case DHCPOptSubnetMask, DHCPOptServerID, DHCPOptBroadcastAddr,
+		DHCPOptSolicitAddr, DHCPOptRequestIP: // net.IP
+		if len(o.Data) < 4 {
+			return fmt.Sprintf("Option(%s:INVALID)", o.Type)
+		}
+		return fmt.Sprintf("Option(%s:%s)", o.Type, net.IP(o.Data))
+
+	case DHCPOptT1, DHCPOptT2, DHCPOptLeaseTime, DHCPOptPathMTUAgingTimeout,
+		DHCPOptARPTimeout, DHCPOptTCPKeepAliveInt: // uint32
+		if len(o.Data) != 4 {
+			return fmt.Sprintf("Option(%s:INVALID)", o.Type)
+		}
+		return fmt.Sprintf("Option(%s:%d)", o.Type,
+			uint32(o.Data[0])<<24|uint32(o.Data[1])<<16|uint32(o.Data[2])<<8|uint32(o.Data[3]))
+
+	case DHCPOptParamsRequest:
+		buf := &bytes.Buffer{}
+		buf.WriteString(fmt.Sprintf("Option(%s:", o.Type))
+		for i, v := range o.Data {
+			buf.WriteString(DHCPOpt(v).String())
+			if i+1 != len(o.Data) {
+				buf.WriteByte(',')
+			}
+		}
+		buf.WriteString(")")
+		return buf.String()
+
+	default:
+		return fmt.Sprintf("Option(%s:%v)", o.Type, o.Data)
+	}
+}
+
+// NewDHCPOption constructs a new DHCPOption with a given type and data.
+func NewDHCPOption(t DHCPOpt, data []byte) DHCPOption {
+	o := DHCPOption{Type: t}
+	if data != nil {
+		o.Data = data
+		o.Length = uint8(len(data))
+	}
+	return o
+}
+
+func (o *DHCPOption) encode(b []byte) error {
+	switch o.Type {
+	case DHCPOptPad, DHCPOptEnd:
+		b[0] = byte(o.Type)
+	default:
+		b[0] = byte(o.Type)
+		b[1] = o.Length
+		copy(b[2:], o.Data)
+	}
+	return nil
+}
+
+func (o *DHCPOption) decode(data []byte) error {
+	if len(data) < 1 {
+		// Pad/End have a length of 1
+		return DecOptionNotEnoughData
+	}
+	o.Type = DHCPOpt(data[0])
+	switch o.Type {
+	case DHCPOptPad, DHCPOptEnd:
+		o.Data = nil
+	default:
+		if len(data) < 2 {
+			return DecOptionNotEnoughData
+		}
+		o.Length = data[1]
+		if int(o.Length) > len(data[2:]) {
+			return DecOptionMalformed
+		}
+		o.Data = data[2 : 2+int(o.Length)]
+	}
+	return nil
+}
+
+// DHCPv4Error is used for constant errors for DHCPv4. It is needed for test asserts.
+type DHCPv4Error string
+
+// DHCPv4Error implements error interface.
+func (d DHCPv4Error) Error() string {
+	return string(d)
+}
+
+const (
+	// DecOptionNotEnoughData is returned when there is not enough data during option's decode process
+	DecOptionNotEnoughData = DHCPv4Error("Not enough data to decode")
+	// DecOptionMalformed is returned when the option is malformed
+	DecOptionMalformed = DHCPv4Error("Option is malformed")
+	// InvalidMagicCookie is returned when Magic cookie is missing into BOOTP header
+	InvalidMagicCookie = DHCPv4Error("Bad DHCP header")
+)

vendor/github.com/google/gopacket/layers/dhcpv6.go

@@ -0,0 +1,360 @@
+// Copyright 2018 Google, Inc. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+package layers
+
+import (
+	"encoding/binary"
+	"fmt"
+	"net"
+
+	"github.com/google/gopacket"
+)
+
+// DHCPv6MsgType represents a DHCPv6 operation
+type DHCPv6MsgType byte
+
+// Constants that represent DHCP operations
+const (
+	DHCPv6MsgTypeUnspecified DHCPv6MsgType = iota
+	DHCPv6MsgTypeSolicit
+	DHCPv6MsgTypeAdverstise
+	DHCPv6MsgTypeRequest
+	DHCPv6MsgTypeConfirm
+	DHCPv6MsgTypeRenew
+	DHCPv6MsgTypeRebind
+	DHCPv6MsgTypeReply
+	DHCPv6MsgTypeRelease
+	DHCPv6MsgTypeDecline
+	DHCPv6MsgTypeReconfigure
+	DHCPv6MsgTypeInformationRequest
+	DHCPv6MsgTypeRelayForward
+	DHCPv6MsgTypeRelayReply
+)
+
+// String returns a string version of a DHCPv6MsgType.
+func (o DHCPv6MsgType) String() string {
+	switch o {
+	case DHCPv6MsgTypeUnspecified:
+		return "Unspecified"
+	case DHCPv6MsgTypeSolicit:
+		return "Solicit"
+	case DHCPv6MsgTypeAdverstise:
+		return "Adverstise"
+	case DHCPv6MsgTypeRequest:
+		return "Request"
+	case DHCPv6MsgTypeConfirm:
+		return "Confirm"
+	case DHCPv6MsgTypeRenew:
+		return "Renew"
+	case DHCPv6MsgTypeRebind:
+		return "Rebind"
+	case DHCPv6MsgTypeReply:
+		return "Reply"
+	case DHCPv6MsgTypeRelease:
+		return "Release"
+	case DHCPv6MsgTypeDecline:
+		return "Decline"
+	case DHCPv6MsgTypeReconfigure:
+		return "Reconfigure"
+	case DHCPv6MsgTypeInformationRequest:
+		return "InformationRequest"
+	case DHCPv6MsgTypeRelayForward:
+		return "RelayForward"
+	case DHCPv6MsgTypeRelayReply:
+		return "RelayReply"
+	default:
+		return "Unknown"
+	}
+}
+
+// DHCPv6 contains data for a single DHCP packet.
+type DHCPv6 struct {
+	BaseLayer
+	MsgType       DHCPv6MsgType
+	HopCount      uint8
+	LinkAddr      net.IP
+	PeerAddr      net.IP
+	TransactionID []byte
+	Options       DHCPv6Options
+}
+
+// LayerType returns gopacket.LayerTypeDHCPv6
+func (d *DHCPv6) LayerType() gopacket.LayerType { return LayerTypeDHCPv6 }
+
+// DecodeFromBytes decodes the given bytes into this layer.
+func (d *DHCPv6) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+	if len(data) < 4 {
+		df.SetTruncated()
+		return fmt.Errorf("DHCPv6 length %d too short", len(data))
+	}
+	d.BaseLayer = BaseLayer{Contents: data}
+	d.Options = d.Options[:0]
+	d.MsgType = DHCPv6MsgType(data[0])
+
+	offset := 0
+	if d.MsgType == DHCPv6MsgTypeRelayForward || d.MsgType == DHCPv6MsgTypeRelayReply {
+		if len(data) < 34 {
+			df.SetTruncated()
+			return fmt.Errorf("DHCPv6 length %d too short for message type %d", len(data), d.MsgType)
+		}
+		d.HopCount = data[1]
+		d.LinkAddr = net.IP(data[2:18])
+		d.PeerAddr = net.IP(data[18:34])
+		offset = 34
+	} else {
+		d.TransactionID = data[1:4]
+		offset = 4
+	}
+
+	stop := len(data)
+	for offset < stop {
+		o := DHCPv6Option{}
+		if err := o.decode(data[offset:]); err != nil {
+			return err
+		}
+		d.Options = append(d.Options, o)
+		offset += int(o.Length) + 4 // 2 from option code, 2 from option length
+	}
+
+	return nil
+}
+
+// Len returns the length of a DHCPv6 packet.
+func (d *DHCPv6) Len() int {
+	n := 1
+	if d.MsgType == DHCPv6MsgTypeRelayForward || d.MsgType == DHCPv6MsgTypeRelayReply {
+		n += 33
+	} else {
+		n += 3
+	}
+
+	for _, o := range d.Options {
+		n += int(o.Length) + 4 // 2 from option code, 2 from option length
+	}
+
+	return n
+}
+
+// SerializeTo writes the serialized form of this layer into the
+// SerializationBuffer, implementing gopacket.SerializableLayer.
+// See the docs for gopacket.SerializableLayer for more info.
+func (d *DHCPv6) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	plen := int(d.Len())
+
+	data, err := b.PrependBytes(plen)
+	if err != nil {
+		return err
+	}
+
+	offset := 0
+	data[0] = byte(d.MsgType)
+	if d.MsgType == DHCPv6MsgTypeRelayForward || d.MsgType == DHCPv6MsgTypeRelayReply {
+		data[1] = byte(d.HopCount)
+		copy(data[2:18], d.LinkAddr.To16())
+		copy(data[18:34], d.PeerAddr.To16())
+		offset = 34
+	} else {
+		copy(data[1:4], d.TransactionID)
+		offset = 4
+	}
+
+	if len(d.Options) > 0 {
+		for _, o := range d.Options {
+			if err := o.encode(data[offset:], opts); err != nil {
+				return err
+			}
+			offset += int(o.Length) + 4 // 2 from option code, 2 from option length
+		}
+	}
+	return nil
+}
+
+// CanDecode returns the set of layer types that this DecodingLayer can decode.
+func (d *DHCPv6) CanDecode() gopacket.LayerClass {
+	return LayerTypeDHCPv6
+}
+
+// NextLayerType returns the layer type contained by this DecodingLayer.
+func (d *DHCPv6) NextLayerType() gopacket.LayerType {
+	return gopacket.LayerTypePayload
+}
+
+func decodeDHCPv6(data []byte, p gopacket.PacketBuilder) error {
+	dhcp := &DHCPv6{}
+	err := dhcp.DecodeFromBytes(data, p)
+	if err != nil {
+		return err
+	}
+	p.AddLayer(dhcp)
+	return p.NextDecoder(gopacket.LayerTypePayload)
+}
+
+// DHCPv6StatusCode represents a DHCP status code - RFC-3315
+type DHCPv6StatusCode uint16
+
+// Constants for the DHCPv6StatusCode.
+const (
+	DHCPv6StatusCodeSuccess DHCPv6StatusCode = iota
+	DHCPv6StatusCodeUnspecFail
+	DHCPv6StatusCodeNoAddrsAvail
+	DHCPv6StatusCodeNoBinding
+	DHCPv6StatusCodeNotOnLink
+	DHCPv6StatusCodeUseMulticast
+)
+
+// String returns a string version of a DHCPv6StatusCode.
+func (o DHCPv6StatusCode) String() string {
+	switch o {
+	case DHCPv6StatusCodeSuccess:
+		return "Success"
+	case DHCPv6StatusCodeUnspecFail:
+		return "UnspecifiedFailure"
+	case DHCPv6StatusCodeNoAddrsAvail:
+		return "NoAddressAvailable"
+	case DHCPv6StatusCodeNoBinding:
+		return "NoBinding"
+	case DHCPv6StatusCodeNotOnLink:
+		return "NotOnLink"
+	case DHCPv6StatusCodeUseMulticast:
+		return "UseMulticast"
+	default:
+		return "Unknown"
+	}
+}
+
+// DHCPv6DUIDType represents a DHCP DUID - RFC-3315
+type DHCPv6DUIDType uint16
+
+// Constants for the DHCPv6DUIDType.
+const (
+	DHCPv6DUIDTypeLLT DHCPv6DUIDType = iota + 1
+	DHCPv6DUIDTypeEN
+	DHCPv6DUIDTypeLL
+)
+
+// String returns a string version of a DHCPv6DUIDType.
+func (o DHCPv6DUIDType) String() string {
+	switch o {
+	case DHCPv6DUIDTypeLLT:
+		return "LLT"
+	case DHCPv6DUIDTypeEN:
+		return "EN"
+	case DHCPv6DUIDTypeLL:
+		return "LL"
+	default:
+		return "Unknown"
+	}
+}
+
+// DHCPv6DUID means DHCP Unique Identifier as stated in RFC 3315, section 9 (https://tools.ietf.org/html/rfc3315#page-19)
+type DHCPv6DUID struct {
+	Type DHCPv6DUIDType
+	// LLT, LL
+	HardwareType []byte
+	// EN
+	EnterpriseNumber []byte
+	// LLT
+	Time []byte
+	// LLT, LL
+	LinkLayerAddress net.HardwareAddr
+	// EN
+	Identifier []byte
+}
+
+// DecodeFromBytes decodes the given bytes into a DHCPv6DUID
+func (d *DHCPv6DUID) DecodeFromBytes(data []byte) error {
+	if len(data) < 2 {
+		return fmt.Errorf("Not enough bytes to decode: %d", len(data))
+	}
+
+	d.Type = DHCPv6DUIDType(binary.BigEndian.Uint16(data[:2]))
+	if d.Type == DHCPv6DUIDTypeLLT || d.Type == DHCPv6DUIDTypeLL {
+		if len(data) < 4 {
+			return fmt.Errorf("Not enough bytes to decode: %d", len(data))
+		}
+		d.HardwareType = data[2:4]
+	}
+
+	if d.Type == DHCPv6DUIDTypeLLT {
+		if len(data) < 8 {
+			return fmt.Errorf("Not enough bytes to decode: %d", len(data))
+		}
+		d.Time = data[4:8]
+		d.LinkLayerAddress = net.HardwareAddr(data[8:])
+	} else if d.Type == DHCPv6DUIDTypeEN {
+		if len(data) < 6 {
+			return fmt.Errorf("Not enough bytes to decode: %d", len(data))
+		}
+		d.EnterpriseNumber = data[2:6]
+		d.Identifier = data[6:]
+	} else { // DHCPv6DUIDTypeLL
+		if len(data) < 4 {
+			return fmt.Errorf("Not enough bytes to decode: %d", len(data))
+		}
+		d.LinkLayerAddress = net.HardwareAddr(data[4:])
+	}
+
+	return nil
+}
+
+// Encode encodes the DHCPv6DUID in a slice of bytes
+func (d *DHCPv6DUID) Encode() []byte {
+	length := d.Len()
+	data := make([]byte, length)
+	binary.BigEndian.PutUint16(data[0:2], uint16(d.Type))
+
+	if d.Type == DHCPv6DUIDTypeLLT || d.Type == DHCPv6DUIDTypeLL {
+		copy(data[2:4], d.HardwareType)
+	}
+
+	if d.Type == DHCPv6DUIDTypeLLT {
+		copy(data[4:8], d.Time)
+		copy(data[8:], d.LinkLayerAddress)
+	} else if d.Type == DHCPv6DUIDTypeEN {
+		copy(data[2:6], d.EnterpriseNumber)
+		copy(data[6:], d.Identifier)
+	} else {
+		copy(data[4:], d.LinkLayerAddress)
+	}
+
+	return data
+}
+
+// Len returns the length of the DHCPv6DUID, respecting the type
+func (d *DHCPv6DUID) Len() int {
+	length := 2 // d.Type
+	if d.Type == DHCPv6DUIDTypeLLT {
+		length += 2 /*HardwareType*/ + 4 /*d.Time*/ + len(d.LinkLayerAddress)
+	} else if d.Type == DHCPv6DUIDTypeEN {
+		length += 4 /*d.EnterpriseNumber*/ + len(d.Identifier)
+	} else { // LL
+		length += 2 /*d.HardwareType*/ + len(d.LinkLayerAddress)
+	}
+
+	return length
+}
+
+func (d *DHCPv6DUID) String() string {
+	duid := "Type: " + d.Type.String() + ", "
+	if d.Type == DHCPv6DUIDTypeLLT {
+		duid += fmt.Sprintf("HardwareType: %v, Time: %v, LinkLayerAddress: %v", d.HardwareType, d.Time, d.LinkLayerAddress)
+	} else if d.Type == DHCPv6DUIDTypeEN {
+		duid += fmt.Sprintf("EnterpriseNumber: %v, Identifier: %v", d.EnterpriseNumber, d.Identifier)
+	} else { // DHCPv6DUIDTypeLL
+		duid += fmt.Sprintf("HardwareType: %v, LinkLayerAddress: %v", d.HardwareType, d.LinkLayerAddress)
+	}
+	return duid
+}
+
+func decodeDHCPv6DUID(data []byte) (*DHCPv6DUID, error) {
+	duid := &DHCPv6DUID{}
+	err := duid.DecodeFromBytes(data)
+	if err != nil {
+		return nil, err
+	}
+	return duid, nil
+}

vendor/github.com/google/gopacket/layers/dhcpv6_options.go

@@ -0,0 +1,621 @@
+// Copyright 2018 The GoPacket Authors. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+package layers
+
+import (
+	"bytes"
+	"encoding/binary"
+	"errors"
+	"fmt"
+	"github.com/google/gopacket"
+)
+
+// DHCPv6Opt represents a DHCP option or parameter from RFC-3315
+type DHCPv6Opt uint16
+
+// Constants for the DHCPv6Opt options.
+const (
+	DHCPv6OptClientID           DHCPv6Opt = 1
+	DHCPv6OptServerID           DHCPv6Opt = 2
+	DHCPv6OptIANA               DHCPv6Opt = 3
+	DHCPv6OptIATA               DHCPv6Opt = 4
+	DHCPv6OptIAAddr             DHCPv6Opt = 5
+	DHCPv6OptOro                DHCPv6Opt = 6
+	DHCPv6OptPreference         DHCPv6Opt = 7
+	DHCPv6OptElapsedTime        DHCPv6Opt = 8
+	DHCPv6OptRelayMessage       DHCPv6Opt = 9
+	DHCPv6OptAuth               DHCPv6Opt = 11
+	DHCPv6OptUnicast            DHCPv6Opt = 12
+	DHCPv6OptStatusCode         DHCPv6Opt = 13
+	DHCPv6OptRapidCommit        DHCPv6Opt = 14
+	DHCPv6OptUserClass          DHCPv6Opt = 15
+	DHCPv6OptVendorClass        DHCPv6Opt = 16
+	DHCPv6OptVendorOpts         DHCPv6Opt = 17
+	DHCPv6OptInterfaceID        DHCPv6Opt = 18
+	DHCPv6OptReconfigureMessage DHCPv6Opt = 19
+	DHCPv6OptReconfigureAccept  DHCPv6Opt = 20
+
+	// RFC 3319 Session Initiation Protocol (SIP)
+	DHCPv6OptSIPServersDomainList  DHCPv6Opt = 21
+	DHCPv6OptSIPServersAddressList DHCPv6Opt = 22
+
+	// RFC 3646 DNS Configuration
+	DHCPv6OptDNSServers DHCPv6Opt = 23
+	DHCPv6OptDomainList DHCPv6Opt = 24
+
+	// RFC 3633 Prefix Delegation
+	DHCPv6OptIAPD     DHCPv6Opt = 25
+	DHCPv6OptIAPrefix DHCPv6Opt = 26
+
+	// RFC 3898 Network Information Service (NIS)
+	DHCPv6OptNISServers     DHCPv6Opt = 27
+	DHCPv6OptNISPServers    DHCPv6Opt = 28
+	DHCPv6OptNISDomainName  DHCPv6Opt = 29
+	DHCPv6OptNISPDomainName DHCPv6Opt = 30
+
+	// RFC 4075 Simple Network Time Protocol (SNTP)
+	DHCPv6OptSNTPServers DHCPv6Opt = 31
+
+	// RFC 4242 Information Refresh Time Option
+	DHCPv6OptInformationRefreshTime DHCPv6Opt = 32
+
+	// RFC 4280 Broadcast and Multicast Control Servers
+	DHCPv6OptBCMCSServerDomainNameList DHCPv6Opt = 33
+	DHCPv6OptBCMCSServerAddressList    DHCPv6Opt = 34
+
+	// RFC 4776 Civic Address ConfigurationOption
+	DHCPv6OptGeoconfCivic DHCPv6Opt = 36
+
+	// RFC 4649 Relay Agent Remote-ID
+	DHCPv6OptRemoteID DHCPv6Opt = 37
+
+	// RFC 4580 Relay Agent Subscriber-ID
+	DHCPv6OptSubscriberID DHCPv6Opt = 38
+
+	// RFC 4704 Client Full Qualified Domain Name (FQDN)
+	DHCPv6OptClientFQDN DHCPv6Opt = 39
+
+	// RFC 5192 Protocol for Carrying Authentication for Network Access (PANA)
+	DHCPv6OptPanaAgent DHCPv6Opt = 40
+
+	// RFC 4833 Timezone Options
+	DHCPv6OptNewPOSIXTimezone DHCPv6Opt = 41
+	DHCPv6OptNewTZDBTimezone  DHCPv6Opt = 42
+
+	// RFC 4994 Relay Agent Echo Request
+	DHCPv6OptEchoRequestOption DHCPv6Opt = 43
+
+	// RFC 5007 Leasequery
+	DHCPv6OptLQQuery      DHCPv6Opt = 44
+	DHCPv6OptCLTTime      DHCPv6Opt = 45
+	DHCPv6OptClientData   DHCPv6Opt = 46
+	DHCPv6OptLQRelayData  DHCPv6Opt = 47
+	DHCPv6OptLQClientLink DHCPv6Opt = 48
+
+	// RFC 6610 Home Information Discovery in Mobile IPv6 (MIPv6)
+	DHCPv6OptMIP6HNIDF DHCPv6Opt = 49
+	DHCPv6OptMIP6VDINF DHCPv6Opt = 50
+	DHCPv6OptMIP6IDINF DHCPv6Opt = 69
+	DHCPv6OptMIP6UDINF DHCPv6Opt = 70
+	DHCPv6OptMIP6HNP   DHCPv6Opt = 71
+	DHCPv6OptMIP6HAA   DHCPv6Opt = 72
+	DHCPv6OptMIP6HAF   DHCPv6Opt = 73
+
+	// RFC 5223 Discovering Location-to-Service Translation (LoST) Servers
+	DHCPv6OptV6LOST DHCPv6Opt = 51
+
+	// RFC 5417 Control And Provisioning of Wireless Access Points (CAPWAP)
+	DHCPv6OptCAPWAPACV6 DHCPv6Opt = 52
+
+	// RFC 5460 Bulk Leasequery
+	DHCPv6OptRelayID DHCPv6Opt = 53
+
+	// RFC 5678 IEEE 802.21 Mobility Services (MoS) Discovery
+	DHCPv6OptIPv6AddressMoS DHCPv6Opt = 54
+	DHCPv6OptIPv6FQDNMoS    DHCPv6Opt = 55
+
+	// RFC 5908 NTP Server Option
+	DHCPv6OptNTPServer DHCPv6Opt = 56
+
+	// RFC 5986 Discovering the Local Location Information Server (LIS)
+	DHCPv6OptV6AccessDomain DHCPv6Opt = 57
+
+	// RFC 5986 SIP User Agent
+	DHCPv6OptSIPUACSList DHCPv6Opt = 58
+
+	// RFC 5970 Options for Network Boot
+	DHCPv6OptBootFileURL    DHCPv6Opt = 59
+	DHCPv6OptBootFileParam  DHCPv6Opt = 60
+	DHCPv6OptClientArchType DHCPv6Opt = 61
+	DHCPv6OptNII            DHCPv6Opt = 62
+
+	// RFC 6225 Coordinate-Based Location Configuration Information
+	DHCPv6OptGeolocation DHCPv6Opt = 63
+
+	// RFC 6334 Dual-Stack Lite
+	DHCPv6OptAFTRName DHCPv6Opt = 64
+
+	// RFC 6440 EAP Re-authentication Protocol (ERP)
+	DHCPv6OptERPLocalDomainName DHCPv6Opt = 65
+
+	// RFC 6422 Relay-Supplied DHCP Options
+	DHCPv6OptRSOO DHCPv6Opt = 66
+
+	// RFC 6603 Prefix Exclude Option for DHCPv6-based Prefix Delegation
+	DHCPv6OptPDExclude DHCPv6Opt = 67
+
+	// RFC 6607 Virtual Subnet Selection
+	DHCPv6OptVSS DHCPv6Opt = 68
+
+	// RFC 6731 Improved Recursive DNS Server Selection for Multi-Interfaced Nodes
+	DHCPv6OptRDNSSSelection DHCPv6Opt = 74
+
+	// RFC 6784 Kerberos Options for DHCPv6
+	DHCPv6OptKRBPrincipalName DHCPv6Opt = 75
+	DHCPv6OptKRBRealmName     DHCPv6Opt = 76
+	DHCPv6OptKRBKDC           DHCPv6Opt = 77
+
+	// RFC 6939 Client Link-Layer Address Option
+	DHCPv6OptClientLinkLayerAddress DHCPv6Opt = 79
+
+	// RFC 6977 Triggering DHCPv6 Reconfiguration from Relay Agents
+	DHCPv6OptLinkAddress DHCPv6Opt = 80
+
+	// RFC 7037 RADIUS Option for the DHCPv6 Relay Agent
+	DHCPv6OptRADIUS DHCPv6Opt = 81
+
+	// RFC 7083 Modification to Default Values of SOL_MAX_RT and INF_MAX_RT
+	DHCPv6OptSolMaxRt DHCPv6Opt = 82
+	DHCPv6OptInfMaxRt DHCPv6Opt = 83
+
+	// RFC 7078 Distributing Address Selection Policy
+	DHCPv6OptAddrSel      DHCPv6Opt = 84
+	DHCPv6OptAddrSelTable DHCPv6Opt = 85
+
+	// RFC 7291 DHCP Options for the Port Control Protocol (PCP)
+	DHCPv6OptV6PCPServer DHCPv6Opt = 86
+
+	// RFC 7341 DHCPv4-over-DHCPv6 (DHCP 4o6) Transport
+	DHCPv6OptDHCPv4Message          DHCPv6Opt = 87
+	DHCPv6OptDHCPv4OverDHCPv6Server DHCPv6Opt = 88
+
+	// RFC 7598 Configuration of Softwire Address and Port-Mapped Clients
+	DHCPv6OptS46Rule           DHCPv6Opt = 89
+	DHCPv6OptS46BR             DHCPv6Opt = 90
+	DHCPv6OptS46DMR            DHCPv6Opt = 91
+	DHCPv6OptS46V4V4Bind       DHCPv6Opt = 92
+	DHCPv6OptS46PortParameters DHCPv6Opt = 93
+	DHCPv6OptS46ContMAPE       DHCPv6Opt = 94
+	DHCPv6OptS46ContMAPT       DHCPv6Opt = 95
+	DHCPv6OptS46ContLW         DHCPv6Opt = 96
+
+	// RFC 7600 IPv4 Residual Deployment via IPv6
+	DHCPv6Opt4RD           DHCPv6Opt = 97
+	DHCPv6Opt4RDMapRule    DHCPv6Opt = 98
+	DHCPv6Opt4RDNonMapRule DHCPv6Opt = 99
+
+	// RFC 7653 Active Leasequery
+	DHCPv6OptLQBaseTime  DHCPv6Opt = 100
+	DHCPv6OptLQStartTime DHCPv6Opt = 101
+	DHCPv6OptLQEndTime   DHCPv6Opt = 102
+
+	// RFC 7710 Captive-Portal Identification
+	DHCPv6OptCaptivePortal DHCPv6Opt = 103
+
+	// RFC 7774 Multicast Protocol for Low-Power and Lossy Networks (MPL) Parameter Configuration
+	DHCPv6OptMPLParameters DHCPv6Opt = 104
+
+	// RFC 7839 Access-Network-Identifier (ANI)
+	DHCPv6OptANIATT           DHCPv6Opt = 105
+	DHCPv6OptANINetworkName   DHCPv6Opt = 106
+	DHCPv6OptANIAPName        DHCPv6Opt = 107
+	DHCPv6OptANIAPBSSID       DHCPv6Opt = 108
+	DHCPv6OptANIOperatorID    DHCPv6Opt = 109
+	DHCPv6OptANIOperatorRealm DHCPv6Opt = 110
+
+	// RFC 8026 Unified IPv4-in-IPv6 Softwire Customer Premises Equipment (CPE)
+	DHCPv6OptS46Priority DHCPv6Opt = 111
+
+	// draft-ietf-opsawg-mud-25 Manufacturer Usage Description (MUD)
+	DHCPv6OptMUDURLV6 DHCPv6Opt = 112
+
+	// RFC 8115 IPv4-Embedded Multicast and Unicast IPv6 Prefixes
+	DHCPv6OptV6Prefix64 DHCPv6Opt = 113
+
+	// RFC 8156 DHCPv6 Failover Protocol
+	DHCPv6OptFBindingStatus           DHCPv6Opt = 114
+	DHCPv6OptFConnectFlags            DHCPv6Opt = 115
+	DHCPv6OptFDNSRemovalInfo          DHCPv6Opt = 116
+	DHCPv6OptFDNSHostName             DHCPv6Opt = 117
+	DHCPv6OptFDNSZoneName             DHCPv6Opt = 118
+	DHCPv6OptFDNSFlags                DHCPv6Opt = 119
+	DHCPv6OptFExpirationTime          DHCPv6Opt = 120
+	DHCPv6OptFMaxUnacknowledgedBNDUPD DHCPv6Opt = 121
+	DHCPv6OptFMCLT                    DHCPv6Opt = 122
+	DHCPv6OptFPartnerLifetime         DHCPv6Opt = 123
+	DHCPv6OptFPartnerLifetimeSent     DHCPv6Opt = 124
+	DHCPv6OptFPartnerDownTime         DHCPv6Opt = 125
+	DHCPv6OptFPartnerRawCltTime       DHCPv6Opt = 126
+	DHCPv6OptFProtocolVersion         DHCPv6Opt = 127
+	DHCPv6OptFKeepaliveTime           DHCPv6Opt = 128
+	DHCPv6OptFReconfigureData         DHCPv6Opt = 129
+	DHCPv6OptFRelationshipName        DHCPv6Opt = 130
+	DHCPv6OptFServerFlags             DHCPv6Opt = 131
+	DHCPv6OptFServerState             DHCPv6Opt = 132
+	DHCPv6OptFStartTimeOfState        DHCPv6Opt = 133
+	DHCPv6OptFStateExpirationTime     DHCPv6Opt = 134
+
+	// RFC 8357 Generalized UDP Source Port for DHCP Relay
+	DHCPv6OptRelayPort DHCPv6Opt = 135
+
+	// draft-ietf-netconf-zerotouch-25 Zero Touch Provisioning for Networking Devices
+	DHCPv6OptV6ZeroTouchRedirect DHCPv6Opt = 136
+
+	// RFC 6153 Access Network Discovery and Selection Function (ANDSF) Discovery
+	DHCPv6OptIPV6AddressANDSF DHCPv6Opt = 143
+)
+
+// String returns a string version of a DHCPv6Opt.
+func (o DHCPv6Opt) String() string {
+	switch o {
+	case DHCPv6OptClientID:
+		return "ClientID"
+	case DHCPv6OptServerID:
+		return "ServerID"
+	case DHCPv6OptIANA:
+		return "IA_NA"
+	case DHCPv6OptIATA:
+		return "IA_TA"
+	case DHCPv6OptIAAddr:
+		return "IAAddr"
+	case DHCPv6OptOro:
+		return "Oro"
+	case DHCPv6OptPreference:
+		return "Preference"
+	case DHCPv6OptElapsedTime:
+		return "ElapsedTime"
+	case DHCPv6OptRelayMessage:
+		return "RelayMessage"
+	case DHCPv6OptAuth:
+		return "Auth"
+	case DHCPv6OptUnicast:
+		return "Unicast"
+	case DHCPv6OptStatusCode:
+		return "StatusCode"
+	case DHCPv6OptRapidCommit:
+		return "RapidCommit"
+	case DHCPv6OptUserClass:
+		return "UserClass"
+	case DHCPv6OptVendorClass:
+		return "VendorClass"
+	case DHCPv6OptVendorOpts:
+		return "VendorOpts"
+	case DHCPv6OptInterfaceID:
+		return "InterfaceID"
+	case DHCPv6OptReconfigureMessage:
+		return "ReconfigureMessage"
+	case DHCPv6OptReconfigureAccept:
+		return "ReconfigureAccept"
+	case DHCPv6OptSIPServersDomainList:
+		return "SIPServersDomainList"
+	case DHCPv6OptSIPServersAddressList:
+		return "SIPServersAddressList"
+	case DHCPv6OptDNSServers:
+		return "DNSRecursiveNameServer"
+	case DHCPv6OptDomainList:
+		return "DomainSearchList"
+	case DHCPv6OptIAPD:
+		return "IdentityAssociationPrefixDelegation"
+	case DHCPv6OptIAPrefix:
+		return "IAPDPrefix"
+	case DHCPv6OptNISServers:
+		return "NISServers"
+	case DHCPv6OptNISPServers:
+		return "NISv2Servers"
+	case DHCPv6OptNISDomainName:
+		return "NISDomainName"
+	case DHCPv6OptNISPDomainName:
+		return "NISv2DomainName"
+	case DHCPv6OptSNTPServers:
+		return "SNTPServers"
+	case DHCPv6OptInformationRefreshTime:
+		return "InformationRefreshTime"
+	case DHCPv6OptBCMCSServerDomainNameList:
+		return "BCMCSControlServersDomainNameList"
+	case DHCPv6OptBCMCSServerAddressList:
+		return "BCMCSControlServersAddressList"
+	case DHCPv6OptGeoconfCivic:
+		return "CivicAddress"
+	case DHCPv6OptRemoteID:
+		return "RelayAgentRemoteID"
+	case DHCPv6OptSubscriberID:
+		return "RelayAgentSubscriberID"
+	case DHCPv6OptClientFQDN:
+		return "ClientFQDN"
+	case DHCPv6OptPanaAgent:
+		return "PANAAuthenticationAgent"
+	case DHCPv6OptNewPOSIXTimezone:
+		return "NewPOSIXTimezone"
+	case DHCPv6OptNewTZDBTimezone:
+		return "NewTZDBTimezone"
+	case DHCPv6OptEchoRequestOption:
+		return "EchoRequest"
+	case DHCPv6OptLQQuery:
+		return "LeasequeryQuery"
+	case DHCPv6OptClientData:
+		return "LeasequeryClientData"
+	case DHCPv6OptCLTTime:
+		return "LeasequeryClientLastTransactionTime"
+	case DHCPv6OptLQRelayData:
+		return "LeasequeryRelayData"
+	case DHCPv6OptLQClientLink:
+		return "LeasequeryClientLink"
+	case DHCPv6OptMIP6HNIDF:
+		return "MIPv6HomeNetworkIDFQDN"
+	case DHCPv6OptMIP6VDINF:
+		return "MIPv6VisitedHomeNetworkInformation"
+	case DHCPv6OptMIP6IDINF:
+		return "MIPv6IdentifiedHomeNetworkInformation"
+	case DHCPv6OptMIP6UDINF:
+		return "MIPv6UnrestrictedHomeNetworkInformation"
+	case DHCPv6OptMIP6HNP:
+		return "MIPv6HomeNetworkPrefix"
+	case DHCPv6OptMIP6HAA:
+		return "MIPv6HomeAgentAddress"
+	case DHCPv6OptMIP6HAF:
+		return "MIPv6HomeAgentFQDN"
+	case DHCPv6OptV6LOST:
+		return "LoST Server"
+	case DHCPv6OptCAPWAPACV6:
+		return "CAPWAPAccessControllerV6"
+	case DHCPv6OptRelayID:
+		return "LeasequeryRelayID"
+	case DHCPv6OptIPv6AddressMoS:
+		return "MoSIPv6Address"
+	case DHCPv6OptIPv6FQDNMoS:
+		return "MoSDomainNameList"
+	case DHCPv6OptNTPServer:
+		return "NTPServer"
+	case DHCPv6OptV6AccessDomain:
+		return "AccessNetworkDomainName"
+	case DHCPv6OptSIPUACSList:
+		return "SIPUserAgentConfigurationServiceDomains"
+	case DHCPv6OptBootFileURL:
+		return "BootFileURL"
+	case DHCPv6OptBootFileParam:
+		return "BootFileParameters"
+	case DHCPv6OptClientArchType:
+		return "ClientSystemArchitectureType"
+	case DHCPv6OptNII:
+		return "ClientNetworkInterfaceIdentifier"
+	case DHCPv6OptGeolocation:
+		return "Geolocation"
+	case DHCPv6OptAFTRName:
+		return "AFTRName"
+	case DHCPv6OptERPLocalDomainName:
+		return "AFTRName"
+	case DHCPv6OptRSOO:
+		return "RSOOption"
+	case DHCPv6OptPDExclude:
+		return "PrefixExclude"
+	case DHCPv6OptVSS:
+		return "VirtualSubnetSelection"
+	case DHCPv6OptRDNSSSelection:
+		return "RDNSSSelection"
+	case DHCPv6OptKRBPrincipalName:
+		return "KerberosPrincipalName"
+	case DHCPv6OptKRBRealmName:
+		return "KerberosRealmName"
+	case DHCPv6OptKRBKDC:
+		return "KerberosKDC"
+	case DHCPv6OptClientLinkLayerAddress:
+		return "ClientLinkLayerAddress"
+	case DHCPv6OptLinkAddress:
+		return "LinkAddress"
+	case DHCPv6OptRADIUS:
+		return "RADIUS"
+	case DHCPv6OptSolMaxRt:
+		return "SolMaxRt"
+	case DHCPv6OptInfMaxRt:
+		return "InfMaxRt"
+	case DHCPv6OptAddrSel:
+		return "AddressSelection"
+	case DHCPv6OptAddrSelTable:
+		return "AddressSelectionTable"
+	case DHCPv6OptV6PCPServer:
+		return "PCPServer"
+	case DHCPv6OptDHCPv4Message:
+		return "DHCPv4Message"
+	case DHCPv6OptDHCPv4OverDHCPv6Server:
+		return "DHCP4o6ServerAddress"
+	case DHCPv6OptS46Rule:
+		return "S46Rule"
+	case DHCPv6OptS46BR:
+		return "S46BR"
+	case DHCPv6OptS46DMR:
+		return "S46DMR"
+	case DHCPv6OptS46V4V4Bind:
+		return "S46IPv4IPv6AddressBinding"
+	case DHCPv6OptS46PortParameters:
+		return "S46PortParameters"
+	case DHCPv6OptS46ContMAPE:
+		return "S46MAPEContainer"
+	case DHCPv6OptS46ContMAPT:
+		return "S46MAPTContainer"
+	case DHCPv6OptS46ContLW:
+		return "S46Lightweight4Over6Container"
+	case DHCPv6Opt4RD:
+		return "4RD"
+	case DHCPv6Opt4RDMapRule:
+		return "4RDMapRule"
+	case DHCPv6Opt4RDNonMapRule:
+		return "4RDNonMapRule"
+	case DHCPv6OptLQBaseTime:
+		return "LQBaseTime"
+	case DHCPv6OptLQStartTime:
+		return "LQStartTime"
+	case DHCPv6OptLQEndTime:
+		return "LQEndTime"
+	case DHCPv6OptCaptivePortal:
+		return "CaptivePortal"
+	case DHCPv6OptMPLParameters:
+		return "MPLParameterConfiguration"
+	case DHCPv6OptANIATT:
+		return "ANIAccessTechnologyType"
+	case DHCPv6OptANINetworkName:
+		return "ANINetworkName"
+	case DHCPv6OptANIAPName:
+		return "ANIAccessPointName"
+	case DHCPv6OptANIAPBSSID:
+		return "ANIAccessPointBSSID"
+	case DHCPv6OptANIOperatorID:
+		return "ANIOperatorIdentifier"
+	case DHCPv6OptANIOperatorRealm:
+		return "ANIOperatorRealm"
+	case DHCPv6OptS46Priority:
+		return "S64Priority"
+	case DHCPv6OptMUDURLV6:
+		return "ManufacturerUsageDescriptionURL"
+	case DHCPv6OptV6Prefix64:
+		return "V6Prefix64"
+	case DHCPv6OptFBindingStatus:
+		return "FailoverBindingStatus"
+	case DHCPv6OptFConnectFlags:
+		return "FailoverConnectFlags"
+	case DHCPv6OptFDNSRemovalInfo:
+		return "FailoverDNSRemovalInfo"
+	case DHCPv6OptFDNSHostName:
+		return "FailoverDNSHostName"
+	case DHCPv6OptFDNSZoneName:
+		return "FailoverDNSZoneName"
+	case DHCPv6OptFDNSFlags:
+		return "FailoverDNSFlags"
+	case DHCPv6OptFExpirationTime:
+		return "FailoverExpirationTime"
+	case DHCPv6OptFMaxUnacknowledgedBNDUPD:
+		return "FailoverMaxUnacknowledgedBNDUPDMessages"
+	case DHCPv6OptFMCLT:
+		return "FailoverMaximumClientLeadTime"
+	case DHCPv6OptFPartnerLifetime:
+		return "FailoverPartnerLifetime"
+	case DHCPv6OptFPartnerLifetimeSent:
+		return "FailoverPartnerLifetimeSent"
+	case DHCPv6OptFPartnerDownTime:
+		return "FailoverPartnerDownTime"
+	case DHCPv6OptFPartnerRawCltTime:
+		return "FailoverPartnerRawClientLeadTime"
+	case DHCPv6OptFProtocolVersion:
+		return "FailoverProtocolVersion"
+	case DHCPv6OptFKeepaliveTime:
+		return "FailoverKeepaliveTime"
+	case DHCPv6OptFReconfigureData:
+		return "FailoverReconfigureData"
+	case DHCPv6OptFRelationshipName:
+		return "FailoverRelationshipName"
+	case DHCPv6OptFServerFlags:
+		return "FailoverServerFlags"
+	case DHCPv6OptFServerState:
+		return "FailoverServerState"
+	case DHCPv6OptFStartTimeOfState:
+		return "FailoverStartTimeOfState"
+	case DHCPv6OptFStateExpirationTime:
+		return "FailoverStateExpirationTime"
+	case DHCPv6OptRelayPort:
+		return "RelayPort"
+	case DHCPv6OptV6ZeroTouchRedirect:
+		return "ZeroTouch"
+	case DHCPv6OptIPV6AddressANDSF:
+		return "ANDSFIPv6Address"
+	default:
+		return fmt.Sprintf("Unknown(%d)", uint16(o))
+	}
+}
+
+// DHCPv6Options is used to get nicely printed option lists which would normally
+// be cut off after 5 options.
+type DHCPv6Options []DHCPv6Option
+
+// String returns a string version of the options list.
+func (o DHCPv6Options) String() string {
+	buf := &bytes.Buffer{}
+	buf.WriteByte('[')
+	for i, opt := range o {
+		buf.WriteString(opt.String())
+		if i+1 != len(o) {
+			buf.WriteString(", ")
+		}
+	}
+	buf.WriteByte(']')
+	return buf.String()
+}
+
+// DHCPv6Option rerpresents a DHCP option.
+type DHCPv6Option struct {
+	Code   DHCPv6Opt
+	Length uint16
+	Data   []byte
+}
+
+// String returns a string version of a DHCP Option.
+func (o DHCPv6Option) String() string {
+	switch o.Code {
+	case DHCPv6OptClientID, DHCPv6OptServerID:
+		duid, err := decodeDHCPv6DUID(o.Data)
+		if err != nil {
+			return fmt.Sprintf("Option(%s:INVALID)", o.Code)
+		}
+		return fmt.Sprintf("Option(%s:[%s])", o.Code, duid.String())
+	case DHCPv6OptOro:
+		options := ""
+		for i := 0; i < int(o.Length); i += 2 {
+			if options != "" {
+				options += ","
+			}
+			option := DHCPv6Opt(binary.BigEndian.Uint16(o.Data[i : i+2]))
+			options += option.String()
+		}
+		return fmt.Sprintf("Option(%s:[%s])", o.Code, options)
+	default:
+		return fmt.Sprintf("Option(%s:%v)", o.Code, o.Data)
+	}
+}
+
+// NewDHCPv6Option constructs a new DHCPv6Option with a given type and data.
+func NewDHCPv6Option(code DHCPv6Opt, data []byte) DHCPv6Option {
+	o := DHCPv6Option{Code: code}
+	if data != nil {
+		o.Data = data
+		o.Length = uint16(len(data))
+	}
+
+	return o
+}
+
+func (o *DHCPv6Option) encode(b []byte, opts gopacket.SerializeOptions) error {
+	binary.BigEndian.PutUint16(b[0:2], uint16(o.Code))
+	if opts.FixLengths {
+		binary.BigEndian.PutUint16(b[2:4], uint16(len(o.Data)))
+	} else {
+		binary.BigEndian.PutUint16(b[2:4], o.Length)
+	}
+	copy(b[4:], o.Data)
+
+	return nil
+}
+
+func (o *DHCPv6Option) decode(data []byte) error {
+	if len(data) < 4 {
+		return errors.New("not enough data to decode")
+	}
+	o.Code = DHCPv6Opt(binary.BigEndian.Uint16(data[0:2]))
+	o.Length = binary.BigEndian.Uint16(data[2:4])
+	if len(data) < 4+int(o.Length) {
+		return fmt.Errorf("dhcpv6 option size < length %d", 4+o.Length)
+	}
+	o.Data = data[4 : 4+o.Length]
+	return nil
+}

vendor/github.com/google/gopacket/layers/doc.go

@@ -0,0 +1,61 @@
+// Copyright 2012 Google, Inc. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+/*
+Package layers provides decoding layers for many common protocols.
+
+The layers package contains decode implementations for a number of different
+types of packet layers.  Users of gopacket will almost always want to also use
+layers to actually decode packet data into useful pieces. To see the set of
+protocols that gopacket/layers is currently able to decode,
+look at the set of LayerTypes defined in the Variables sections. The
+layers package also defines endpoints for many of the common packet layers
+that have source/destination addresses associated with them, for example IPv4/6
+(IPs) and TCP/UDP (ports).
+Finally, layers contains a number of useful enumerations (IPProtocol,
+EthernetType, LinkType, PPPType, etc...).  Many of these implement the
+gopacket.Decoder interface, so they can be passed into gopacket as decoders.
+
+Most common protocol layers are named using acronyms or other industry-common
+names (IPv4, TCP, PPP).  Some of the less common ones have their names expanded
+(CiscoDiscoveryProtocol).
+For certain protocols, sub-parts of the protocol are split out into their own
+layers (SCTP, for example).  This is done mostly in cases where portions of the
+protocol may fulfill the capabilities of interesting layers (SCTPData implements
+ApplicationLayer, while base SCTP implements TransportLayer), or possibly
+because splitting a protocol into a few layers makes decoding easier.
+
+This package is meant to be used with its parent,
+http://github.com/google/gopacket.
+
+Port Types
+
+Instead of using raw uint16 or uint8 values for ports, we use a different port
+type for every protocol, for example TCPPort and UDPPort.  This allows us to
+override string behavior for each port, which we do by setting up port name
+maps (TCPPortNames, UDPPortNames, etc...).  Well-known ports are annotated with
+their protocol names, and their String function displays these names:
+
+  p := TCPPort(80)
+  fmt.Printf("Number: %d  String: %v", p, p)
+  // Prints: "Number: 80  String: 80(http)"
+
+Modifying Decode Behavior
+
+layers links together decoding through its enumerations.  For example, after
+decoding layer type Ethernet, it uses Ethernet.EthernetType as its next decoder.
+All enumerations that act as decoders, like EthernetType, can be modified by
+users depending on their preferences.  For example, if you have a spiffy new
+IPv4 decoder that works way better than the one built into layers, you can do
+this:
+
+ var mySpiffyIPv4Decoder gopacket.Decoder = ...
+ layers.EthernetTypeMetadata[EthernetTypeIPv4].DecodeWith = mySpiffyIPv4Decoder
+
+This will make all future ethernet packets use your new decoder to decode IPv4
+packets, instead of the built-in decoder used by gopacket.
+*/
+package layers

vendor/github.com/google/gopacket/layers/dot1q.go

@@ -0,0 +1,75 @@
+// Copyright 2012 Google, Inc. All rights reserved.
+// Copyright 2009-2011 Andreas Krennmair. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+package layers
+
+import (
+	"encoding/binary"
+	"fmt"
+	"github.com/google/gopacket"
+)
+
+// Dot1Q is the packet layer for 802.1Q VLAN headers.
+type Dot1Q struct {
+	BaseLayer
+	Priority       uint8
+	DropEligible   bool
+	VLANIdentifier uint16
+	Type           EthernetType
+}
+
+// LayerType returns gopacket.LayerTypeDot1Q
+func (d *Dot1Q) LayerType() gopacket.LayerType { return LayerTypeDot1Q }
+
+// DecodeFromBytes decodes the given bytes into this layer.
+func (d *Dot1Q) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+	if len(data) < 4 {
+		df.SetTruncated()
+		return fmt.Errorf("802.1Q tag length %d too short", len(data))
+	}
+	d.Priority = (data[0] & 0xE0) >> 5
+	d.DropEligible = data[0]&0x10 != 0
+	d.VLANIdentifier = binary.BigEndian.Uint16(data[:2]) & 0x0FFF
+	d.Type = EthernetType(binary.BigEndian.Uint16(data[2:4]))
+	d.BaseLayer = BaseLayer{Contents: data[:4], Payload: data[4:]}
+	return nil
+}
+
+// CanDecode returns the set of layer types that this DecodingLayer can decode.
+func (d *Dot1Q) CanDecode() gopacket.LayerClass {
+	return LayerTypeDot1Q
+}
+
+// NextLayerType returns the layer type contained by this DecodingLayer.
+func (d *Dot1Q) NextLayerType() gopacket.LayerType {
+	return d.Type.LayerType()
+}
+
+func decodeDot1Q(data []byte, p gopacket.PacketBuilder) error {
+	d := &Dot1Q{}
+	return decodingLayerDecoder(d, data, p)
+}
+
+// SerializeTo writes the serialized form of this layer into the
+// SerializationBuffer, implementing gopacket.SerializableLayer.
+// See the docs for gopacket.SerializableLayer for more info.
+func (d *Dot1Q) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	bytes, err := b.PrependBytes(4)
+	if err != nil {
+		return err
+	}
+	if d.VLANIdentifier > 0xFFF {
+		return fmt.Errorf("vlan identifier %v is too high", d.VLANIdentifier)
+	}
+	firstBytes := uint16(d.Priority)<<13 | d.VLANIdentifier
+	if d.DropEligible {
+		firstBytes |= 0x1000
+	}
+	binary.BigEndian.PutUint16(bytes, firstBytes)
+	binary.BigEndian.PutUint16(bytes[2:], uint16(d.Type))
+	return nil
+}

vendor/github.com/google/gopacket/layers/eap.go

@@ -0,0 +1,114 @@
+// Copyright 2012 Google, Inc. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+package layers
+
+import (
+	"encoding/binary"
+	"fmt"
+	"github.com/google/gopacket"
+)
+
+type EAPCode uint8
+type EAPType uint8
+
+const (
+	EAPCodeRequest  EAPCode = 1
+	EAPCodeResponse EAPCode = 2
+	EAPCodeSuccess  EAPCode = 3
+	EAPCodeFailure  EAPCode = 4
+
+	// EAPTypeNone means that this EAP layer has no Type or TypeData.
+	// Success and Failure EAPs will have this set.
+	EAPTypeNone EAPType = 0
+
+	EAPTypeIdentity     EAPType = 1
+	EAPTypeNotification EAPType = 2
+	EAPTypeNACK         EAPType = 3
+	EAPTypeOTP          EAPType = 4
+	EAPTypeTokenCard    EAPType = 5
+)
+
+// EAP defines an Extensible Authentication Protocol (rfc 3748) layer.
+type EAP struct {
+	BaseLayer
+	Code     EAPCode
+	Id       uint8
+	Length   uint16
+	Type     EAPType
+	TypeData []byte
+}
+
+// LayerType returns LayerTypeEAP.
+func (e *EAP) LayerType() gopacket.LayerType { return LayerTypeEAP }
+
+// DecodeFromBytes decodes the given bytes into this layer.
+func (e *EAP) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+	if len(data) < 4 {
+		df.SetTruncated()
+		return fmt.Errorf("EAP length %d too short", len(data))
+	}
+	e.Code = EAPCode(data[0])
+	e.Id = data[1]
+	e.Length = binary.BigEndian.Uint16(data[2:4])
+	if len(data) < int(e.Length) {
+		df.SetTruncated()
+		return fmt.Errorf("EAP length %d too short, %d expected", len(data), e.Length)
+	}
+	switch {
+	case e.Length > 4:
+		e.Type = EAPType(data[4])
+		e.TypeData = data[5:]
+	case e.Length == 4:
+		e.Type = 0
+		e.TypeData = nil
+	default:
+		return fmt.Errorf("invalid EAP length %d", e.Length)
+	}
+	e.BaseLayer.Contents = data[:e.Length]
+	e.BaseLayer.Payload = data[e.Length:] // Should be 0 bytes
+	return nil
+}
+
+// SerializeTo writes the serialized form of this layer into the
+// SerializationBuffer, implementing gopacket.SerializableLayer.
+// See the docs for gopacket.SerializableLayer for more info.
+func (e *EAP) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	if opts.FixLengths {
+		e.Length = uint16(len(e.TypeData) + 1)
+	}
+	size := len(e.TypeData) + 4
+	if size > 4 {
+		size++
+	}
+	bytes, err := b.PrependBytes(size)
+	if err != nil {
+		return err
+	}
+	bytes[0] = byte(e.Code)
+	bytes[1] = e.Id
+	binary.BigEndian.PutUint16(bytes[2:], e.Length)
+	if size > 4 {
+		bytes[4] = byte(e.Type)
+		copy(bytes[5:], e.TypeData)
+	}
+	return nil
+}
+
+// CanDecode returns the set of layer types that this DecodingLayer can decode.
+func (e *EAP) CanDecode() gopacket.LayerClass {
+	return LayerTypeEAP
+}
+
+// NextLayerType returns the layer type contained by this DecodingLayer.
+func (e *EAP) NextLayerType() gopacket.LayerType {
+	return gopacket.LayerTypeZero
+}
+
+func decodeEAP(data []byte, p gopacket.PacketBuilder) error {
+	e := &EAP{}
+	return decodingLayerDecoder(e, data, p)
+}

vendor/github.com/google/gopacket/layers/eapol.go

@@ -0,0 +1,302 @@
+// Copyright 2012 Google, Inc. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+package layers
+
+import (
+	"encoding/binary"
+	"fmt"
+	"github.com/google/gopacket"
+)
+
+// EAPOL defines an EAP over LAN (802.1x) layer.
+type EAPOL struct {
+	BaseLayer
+	Version uint8
+	Type    EAPOLType
+	Length  uint16
+}
+
+// LayerType returns LayerTypeEAPOL.
+func (e *EAPOL) LayerType() gopacket.LayerType { return LayerTypeEAPOL }
+
+// DecodeFromBytes decodes the given bytes into this layer.
+func (e *EAPOL) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+	if len(data) < 4 {
+		df.SetTruncated()
+		return fmt.Errorf("EAPOL length %d too short", len(data))
+	}
+	e.Version = data[0]
+	e.Type = EAPOLType(data[1])
+	e.Length = binary.BigEndian.Uint16(data[2:4])
+	e.BaseLayer = BaseLayer{data[:4], data[4:]}
+	return nil
+}
+
+// SerializeTo writes the serialized form of this layer into the
+// SerializationBuffer, implementing gopacket.SerializableLayer
+func (e *EAPOL) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	bytes, _ := b.PrependBytes(4)
+	bytes[0] = e.Version
+	bytes[1] = byte(e.Type)
+	binary.BigEndian.PutUint16(bytes[2:], e.Length)
+	return nil
+}
+
+// CanDecode returns the set of layer types that this DecodingLayer can decode.
+func (e *EAPOL) CanDecode() gopacket.LayerClass {
+	return LayerTypeEAPOL
+}
+
+// NextLayerType returns the layer type contained by this DecodingLayer.
+func (e *EAPOL) NextLayerType() gopacket.LayerType {
+	return e.Type.LayerType()
+}
+
+func decodeEAPOL(data []byte, p gopacket.PacketBuilder) error {
+	e := &EAPOL{}
+	return decodingLayerDecoder(e, data, p)
+}
+
+// EAPOLKeyDescriptorType is an enumeration of key descriptor types
+// as specified by 802.1x in the EAPOL-Key frame
+type EAPOLKeyDescriptorType uint8
+
+// Enumeration of EAPOLKeyDescriptorType
+const (
+	EAPOLKeyDescriptorTypeRC4   EAPOLKeyDescriptorType = 1
+	EAPOLKeyDescriptorTypeDot11 EAPOLKeyDescriptorType = 2
+	EAPOLKeyDescriptorTypeWPA   EAPOLKeyDescriptorType = 254
+)
+
+func (kdt EAPOLKeyDescriptorType) String() string {
+	switch kdt {
+	case EAPOLKeyDescriptorTypeRC4:
+		return "RC4"
+	case EAPOLKeyDescriptorTypeDot11:
+		return "802.11"
+	case EAPOLKeyDescriptorTypeWPA:
+		return "WPA"
+	default:
+		return fmt.Sprintf("unknown descriptor type %d", kdt)
+	}
+}
+
+// EAPOLKeyDescriptorVersion is an enumeration of versions specifying the
+// encryption algorithm for the key data and the authentication for the
+// message integrity code (MIC)
+type EAPOLKeyDescriptorVersion uint8
+
+// Enumeration of EAPOLKeyDescriptorVersion
+const (
+	EAPOLKeyDescriptorVersionOther       EAPOLKeyDescriptorVersion = 0
+	EAPOLKeyDescriptorVersionRC4HMACMD5  EAPOLKeyDescriptorVersion = 1
+	EAPOLKeyDescriptorVersionAESHMACSHA1 EAPOLKeyDescriptorVersion = 2
+	EAPOLKeyDescriptorVersionAES128CMAC  EAPOLKeyDescriptorVersion = 3
+)
+
+func (v EAPOLKeyDescriptorVersion) String() string {
+	switch v {
+	case EAPOLKeyDescriptorVersionOther:
+		return "Other"
+	case EAPOLKeyDescriptorVersionRC4HMACMD5:
+		return "RC4-HMAC-MD5"
+	case EAPOLKeyDescriptorVersionAESHMACSHA1:
+		return "AES-HMAC-SHA1-128"
+	case EAPOLKeyDescriptorVersionAES128CMAC:
+		return "AES-128-CMAC"
+	default:
+		return fmt.Sprintf("unknown version %d", v)
+	}
+}
+
+// EAPOLKeyType is an enumeration of key derivation types describing
+// the purpose of the keys being derived.
+type EAPOLKeyType uint8
+
+// Enumeration of EAPOLKeyType
+const (
+	EAPOLKeyTypeGroupSMK EAPOLKeyType = 0
+	EAPOLKeyTypePairwise EAPOLKeyType = 1
+)
+
+func (kt EAPOLKeyType) String() string {
+	switch kt {
+	case EAPOLKeyTypeGroupSMK:
+		return "Group/SMK"
+	case EAPOLKeyTypePairwise:
+		return "Pairwise"
+	default:
+		return fmt.Sprintf("unknown key type %d", kt)
+	}
+}
+
+// EAPOLKey defines an EAPOL-Key frame for 802.1x authentication
+type EAPOLKey struct {
+	BaseLayer
+	KeyDescriptorType    EAPOLKeyDescriptorType
+	KeyDescriptorVersion EAPOLKeyDescriptorVersion
+	KeyType              EAPOLKeyType
+	KeyIndex             uint8
+	Install              bool
+	KeyACK               bool
+	KeyMIC               bool
+	Secure               bool
+	MICError             bool
+	Request              bool
+	HasEncryptedKeyData  bool
+	SMKMessage           bool
+	KeyLength            uint16
+	ReplayCounter        uint64
+	Nonce                []byte
+	IV                   []byte
+	RSC                  uint64
+	ID                   uint64
+	MIC                  []byte
+	KeyDataLength        uint16
+	EncryptedKeyData     []byte
+}
+
+// LayerType returns LayerTypeEAPOLKey.
+func (ek *EAPOLKey) LayerType() gopacket.LayerType {
+	return LayerTypeEAPOLKey
+}
+
+// CanDecode returns the set of layer types that this DecodingLayer can decode.
+func (ek *EAPOLKey) CanDecode() gopacket.LayerType {
+	return LayerTypeEAPOLKey
+}
+
+// NextLayerType returns layers.LayerTypeDot11InformationElement if the key
+// data exists and is unencrypted, otherwise it does not expect a next layer.
+func (ek *EAPOLKey) NextLayerType() gopacket.LayerType {
+	if !ek.HasEncryptedKeyData && ek.KeyDataLength > 0 {
+		return LayerTypeDot11InformationElement
+	}
+	return gopacket.LayerTypePayload
+}
+
+const eapolKeyFrameLen = 95
+
+// DecodeFromBytes decodes the given bytes into this layer.
+func (ek *EAPOLKey) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+	if len(data) < eapolKeyFrameLen {
+		df.SetTruncated()
+		return fmt.Errorf("EAPOLKey length %v too short, %v required",
+			len(data), eapolKeyFrameLen)
+	}
+
+	ek.KeyDescriptorType = EAPOLKeyDescriptorType(data[0])
+
+	info := binary.BigEndian.Uint16(data[1:3])
+	ek.KeyDescriptorVersion = EAPOLKeyDescriptorVersion(info & 0x0007)
+	ek.KeyType = EAPOLKeyType((info & 0x0008) >> 3)
+	ek.KeyIndex = uint8((info & 0x0030) >> 4)
+	ek.Install = (info & 0x0040) != 0
+	ek.KeyACK = (info & 0x0080) != 0
+	ek.KeyMIC = (info & 0x0100) != 0
+	ek.Secure = (info & 0x0200) != 0
+	ek.MICError = (info & 0x0400) != 0
+	ek.Request = (info & 0x0800) != 0
+	ek.HasEncryptedKeyData = (info & 0x1000) != 0
+	ek.SMKMessage = (info & 0x2000) != 0
+
+	ek.KeyLength = binary.BigEndian.Uint16(data[3:5])
+	ek.ReplayCounter = binary.BigEndian.Uint64(data[5:13])
+
+	ek.Nonce = data[13:45]
+	ek.IV = data[45:61]
+	ek.RSC = binary.BigEndian.Uint64(data[61:69])
+	ek.ID = binary.BigEndian.Uint64(data[69:77])
+	ek.MIC = data[77:93]
+
+	ek.KeyDataLength = binary.BigEndian.Uint16(data[93:95])
+
+	totalLength := eapolKeyFrameLen + int(ek.KeyDataLength)
+	if len(data) < totalLength {
+		df.SetTruncated()
+		return fmt.Errorf("EAPOLKey data length %d too short, %d required",
+			len(data)-eapolKeyFrameLen, ek.KeyDataLength)
+	}
+
+	if ek.HasEncryptedKeyData {
+		ek.EncryptedKeyData = data[eapolKeyFrameLen:totalLength]
+		ek.BaseLayer = BaseLayer{
+			Contents: data[:totalLength],
+			Payload:  data[totalLength:],
+		}
+	} else {
+		ek.BaseLayer = BaseLayer{
+			Contents: data[:eapolKeyFrameLen],
+			Payload:  data[eapolKeyFrameLen:],
+		}
+	}
+
+	return nil
+}
+
+// SerializeTo writes the serialized form of this layer into the
+// SerializationBuffer, implementing gopacket.SerializableLayer.
+// See the docs for gopacket.SerializableLayer for more info.
+func (ek *EAPOLKey) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	buf, err := b.PrependBytes(eapolKeyFrameLen + len(ek.EncryptedKeyData))
+	if err != nil {
+		return err
+	}
+
+	buf[0] = byte(ek.KeyDescriptorType)
+
+	var info uint16
+	info |= uint16(ek.KeyDescriptorVersion)
+	info |= uint16(ek.KeyType) << 3
+	info |= uint16(ek.KeyIndex) << 4
+	if ek.Install {
+		info |= 0x0040
+	}
+	if ek.KeyACK {
+		info |= 0x0080
+	}
+	if ek.KeyMIC {
+		info |= 0x0100
+	}
+	if ek.Secure {
+		info |= 0x0200
+	}
+	if ek.MICError {
+		info |= 0x0400
+	}
+	if ek.Request {
+		info |= 0x0800
+	}
+	if ek.HasEncryptedKeyData {
+		info |= 0x1000
+	}
+	if ek.SMKMessage {
+		info |= 0x2000
+	}
+	binary.BigEndian.PutUint16(buf[1:3], info)
+
+	binary.BigEndian.PutUint16(buf[3:5], ek.KeyLength)
+	binary.BigEndian.PutUint64(buf[5:13], ek.ReplayCounter)
+
+	copy(buf[13:45], ek.Nonce)
+	copy(buf[45:61], ek.IV)
+	binary.BigEndian.PutUint64(buf[61:69], ek.RSC)
+	binary.BigEndian.PutUint64(buf[69:77], ek.ID)
+	copy(buf[77:93], ek.MIC)
+
+	binary.BigEndian.PutUint16(buf[93:95], ek.KeyDataLength)
+	if len(ek.EncryptedKeyData) > 0 {
+		copy(buf[95:95+len(ek.EncryptedKeyData)], ek.EncryptedKeyData)
+	}
+
+	return nil
+}
+
+func decodeEAPOLKey(data []byte, p gopacket.PacketBuilder) error {
+	ek := &EAPOLKey{}
+	return decodingLayerDecoder(ek, data, p)
+}

vendor/github.com/google/gopacket/layers/endpoints.go

@@ -0,0 +1,97 @@
+// Copyright 2012 Google, Inc. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+package layers
+
+import (
+	"encoding/binary"
+	"github.com/google/gopacket"
+	"net"
+	"strconv"
+)
+
+var (
+	// We use two different endpoint types for IPv4 vs IPv6 addresses, so that
+	// ordering with endpointA.LessThan(endpointB) sanely groups all IPv4
+	// addresses and all IPv6 addresses, such that IPv6 > IPv4 for all addresses.
+	EndpointIPv4 = gopacket.RegisterEndpointType(1, gopacket.EndpointTypeMetadata{Name: "IPv4", Formatter: func(b []byte) string {
+		return net.IP(b).String()
+	}})
+	EndpointIPv6 = gopacket.RegisterEndpointType(2, gopacket.EndpointTypeMetadata{Name: "IPv6", Formatter: func(b []byte) string {
+		return net.IP(b).String()
+	}})
+
+	EndpointMAC = gopacket.RegisterEndpointType(3, gopacket.EndpointTypeMetadata{Name: "MAC", Formatter: func(b []byte) string {
+		return net.HardwareAddr(b).String()
+	}})
+	EndpointTCPPort = gopacket.RegisterEndpointType(4, gopacket.EndpointTypeMetadata{Name: "TCP", Formatter: func(b []byte) string {
+		return strconv.Itoa(int(binary.BigEndian.Uint16(b)))
+	}})
+	EndpointUDPPort = gopacket.RegisterEndpointType(5, gopacket.EndpointTypeMetadata{Name: "UDP", Formatter: func(b []byte) string {
+		return strconv.Itoa(int(binary.BigEndian.Uint16(b)))
+	}})
+	EndpointSCTPPort = gopacket.RegisterEndpointType(6, gopacket.EndpointTypeMetadata{Name: "SCTP", Formatter: func(b []byte) string {
+		return strconv.Itoa(int(binary.BigEndian.Uint16(b)))
+	}})
+	EndpointRUDPPort = gopacket.RegisterEndpointType(7, gopacket.EndpointTypeMetadata{Name: "RUDP", Formatter: func(b []byte) string {
+		return strconv.Itoa(int(b[0]))
+	}})
+	EndpointUDPLitePort = gopacket.RegisterEndpointType(8, gopacket.EndpointTypeMetadata{Name: "UDPLite", Formatter: func(b []byte) string {
+		return strconv.Itoa(int(binary.BigEndian.Uint16(b)))
+	}})
+	EndpointPPP = gopacket.RegisterEndpointType(9, gopacket.EndpointTypeMetadata{Name: "PPP", Formatter: func([]byte) string {
+		return "point"
+	}})
+)
+
+// NewIPEndpoint creates a new IP (v4 or v6) endpoint from a net.IP address.
+// It returns gopacket.InvalidEndpoint if the IP address is invalid.
+func NewIPEndpoint(a net.IP) gopacket.Endpoint {
+	ipv4 := a.To4()
+	if ipv4 != nil {
+		return gopacket.NewEndpoint(EndpointIPv4, []byte(ipv4))
+	}
+
+	ipv6 := a.To16()
+	if ipv6 != nil {
+		return gopacket.NewEndpoint(EndpointIPv6, []byte(ipv6))
+	}
+
+	return gopacket.InvalidEndpoint
+}
+
+// NewMACEndpoint returns a new MAC address endpoint.
+func NewMACEndpoint(a net.HardwareAddr) gopacket.Endpoint {
+	return gopacket.NewEndpoint(EndpointMAC, []byte(a))
+}
+func newPortEndpoint(t gopacket.EndpointType, p uint16) gopacket.Endpoint {
+	return gopacket.NewEndpoint(t, []byte{byte(p >> 8), byte(p)})
+}
+
+// NewTCPPortEndpoint returns an endpoint based on a TCP port.
+func NewTCPPortEndpoint(p TCPPort) gopacket.Endpoint {
+	return newPortEndpoint(EndpointTCPPort, uint16(p))
+}
+
+// NewUDPPortEndpoint returns an endpoint based on a UDP port.
+func NewUDPPortEndpoint(p UDPPort) gopacket.Endpoint {
+	return newPortEndpoint(EndpointUDPPort, uint16(p))
+}
+
+// NewSCTPPortEndpoint returns an endpoint based on a SCTP port.
+func NewSCTPPortEndpoint(p SCTPPort) gopacket.Endpoint {
+	return newPortEndpoint(EndpointSCTPPort, uint16(p))
+}
+
+// NewRUDPPortEndpoint returns an endpoint based on a RUDP port.
+func NewRUDPPortEndpoint(p RUDPPort) gopacket.Endpoint {
+	return gopacket.NewEndpoint(EndpointRUDPPort, []byte{byte(p)})
+}
+
+// NewUDPLitePortEndpoint returns an endpoint based on a UDPLite port.
+func NewUDPLitePortEndpoint(p UDPLitePort) gopacket.Endpoint {
+	return newPortEndpoint(EndpointUDPLitePort, uint16(p))
+}

vendor/github.com/google/gopacket/layers/enums.go

@@ -0,0 +1,443 @@
+// Copyright 2012 Google, Inc. All rights reserved.
+// Copyright 2009-2011 Andreas Krennmair. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+package layers
+
+import (
+	"fmt"
+	"runtime"
+
+	"github.com/google/gopacket"
+)
+
+// EnumMetadata keeps track of a set of metadata for each enumeration value
+// for protocol enumerations.
+type EnumMetadata struct {
+	// DecodeWith is the decoder to use to decode this protocol's data.
+	DecodeWith gopacket.Decoder
+	// Name is the name of the enumeration value.
+	Name string
+	// LayerType is the layer type implied by the given enum.
+	LayerType gopacket.LayerType
+}
+
+// EthernetType is an enumeration of ethernet type values, and acts as a decoder
+// for any type it supports.
+type EthernetType uint16
+
+const (
+	// EthernetTypeLLC is not an actual ethernet type.  It is instead a
+	// placeholder we use in Ethernet frames that use the 802.3 standard of
+	// srcmac|dstmac|length|LLC instead of srcmac|dstmac|ethertype.
+	EthernetTypeLLC                         EthernetType = 0
+	EthernetTypeIPv4                        EthernetType = 0x0800
+	EthernetTypeARP                         EthernetType = 0x0806
+	EthernetTypeIPv6                        EthernetType = 0x86DD
+	EthernetTypeCiscoDiscovery              EthernetType = 0x2000
+	EthernetTypeNortelDiscovery             EthernetType = 0x01a2
+	EthernetTypeTransparentEthernetBridging EthernetType = 0x6558
+	EthernetTypeDot1Q                       EthernetType = 0x8100
+	EthernetTypePPP                         EthernetType = 0x880b
+	EthernetTypePPPoEDiscovery              EthernetType = 0x8863
+	EthernetTypePPPoESession                EthernetType = 0x8864
+	EthernetTypeMPLSUnicast                 EthernetType = 0x8847
+	EthernetTypeMPLSMulticast               EthernetType = 0x8848
+	EthernetTypeEAPOL                       EthernetType = 0x888e
+	EthernetTypeERSPAN                      EthernetType = 0x88be
+	EthernetTypeQinQ                        EthernetType = 0x88a8
+	EthernetTypeLinkLayerDiscovery          EthernetType = 0x88cc
+	EthernetTypeEthernetCTP                 EthernetType = 0x9000
+)
+
+// IPProtocol is an enumeration of IP protocol values, and acts as a decoder
+// for any type it supports.
+type IPProtocol uint8
+
+const (
+	IPProtocolIPv6HopByHop    IPProtocol = 0
+	IPProtocolICMPv4          IPProtocol = 1
+	IPProtocolIGMP            IPProtocol = 2
+	IPProtocolIPv4            IPProtocol = 4
+	IPProtocolTCP             IPProtocol = 6
+	IPProtocolUDP             IPProtocol = 17
+	IPProtocolRUDP            IPProtocol = 27
+	IPProtocolIPv6            IPProtocol = 41
+	IPProtocolIPv6Routing     IPProtocol = 43
+	IPProtocolIPv6Fragment    IPProtocol = 44
+	IPProtocolGRE             IPProtocol = 47
+	IPProtocolESP             IPProtocol = 50
+	IPProtocolAH              IPProtocol = 51
+	IPProtocolICMPv6          IPProtocol = 58
+	IPProtocolNoNextHeader    IPProtocol = 59
+	IPProtocolIPv6Destination IPProtocol = 60
+	IPProtocolOSPF            IPProtocol = 89
+	IPProtocolIPIP            IPProtocol = 94
+	IPProtocolEtherIP         IPProtocol = 97
+	IPProtocolVRRP            IPProtocol = 112
+	IPProtocolSCTP            IPProtocol = 132
+	IPProtocolUDPLite         IPProtocol = 136
+	IPProtocolMPLSInIP        IPProtocol = 137
+)
+
+// LinkType is an enumeration of link types, and acts as a decoder for any
+// link type it supports.
+type LinkType uint8
+
+const (
+	// According to pcap-linktype(7) and http://www.tcpdump.org/linktypes.html
+	LinkTypeNull           LinkType = 0
+	LinkTypeEthernet       LinkType = 1
+	LinkTypeAX25           LinkType = 3
+	LinkTypeTokenRing      LinkType = 6
+	LinkTypeArcNet         LinkType = 7
+	LinkTypeSLIP           LinkType = 8
+	LinkTypePPP            LinkType = 9
+	LinkTypeFDDI           LinkType = 10
+	LinkTypePPP_HDLC       LinkType = 50
+	LinkTypePPPEthernet    LinkType = 51
+	LinkTypeATM_RFC1483    LinkType = 100
+	LinkTypeRaw            LinkType = 101
+	LinkTypeC_HDLC         LinkType = 104
+	LinkTypeIEEE802_11     LinkType = 105
+	LinkTypeFRelay         LinkType = 107
+	LinkTypeLoop           LinkType = 108
+	LinkTypeLinuxSLL       LinkType = 113
+	LinkTypeLTalk          LinkType = 114
+	LinkTypePFLog          LinkType = 117
+	LinkTypePrismHeader    LinkType = 119
+	LinkTypeIPOverFC       LinkType = 122
+	LinkTypeSunATM         LinkType = 123
+	LinkTypeIEEE80211Radio LinkType = 127
+	LinkTypeARCNetLinux    LinkType = 129
+	LinkTypeIPOver1394     LinkType = 138
+	LinkTypeMTP2Phdr       LinkType = 139
+	LinkTypeMTP2           LinkType = 140
+	LinkTypeMTP3           LinkType = 141
+	LinkTypeSCCP           LinkType = 142
+	LinkTypeDOCSIS         LinkType = 143
+	LinkTypeLinuxIRDA      LinkType = 144
+	LinkTypeLinuxLAPD      LinkType = 177
+	LinkTypeLinuxUSB       LinkType = 220
+	LinkTypeFC2            LinkType = 224
+	LinkTypeFC2Framed      LinkType = 225
+	LinkTypeIPv4           LinkType = 228
+	LinkTypeIPv6           LinkType = 229
+)
+
+// PPPoECode is the PPPoE code enum, taken from http://tools.ietf.org/html/rfc2516
+type PPPoECode uint8
+
+const (
+	PPPoECodePADI    PPPoECode = 0x09
+	PPPoECodePADO    PPPoECode = 0x07
+	PPPoECodePADR    PPPoECode = 0x19
+	PPPoECodePADS    PPPoECode = 0x65
+	PPPoECodePADT    PPPoECode = 0xA7
+	PPPoECodeSession PPPoECode = 0x00
+)
+
+// PPPType is an enumeration of PPP type values, and acts as a decoder for any
+// type it supports.
+type PPPType uint16
+
+const (
+	PPPTypeIPv4          PPPType = 0x0021
+	PPPTypeIPv6          PPPType = 0x0057
+	PPPTypeMPLSUnicast   PPPType = 0x0281
+	PPPTypeMPLSMulticast PPPType = 0x0283
+)
+
+// SCTPChunkType is an enumeration of chunk types inside SCTP packets.
+type SCTPChunkType uint8
+
+const (
+	SCTPChunkTypeData             SCTPChunkType = 0
+	SCTPChunkTypeInit             SCTPChunkType = 1
+	SCTPChunkTypeInitAck          SCTPChunkType = 2
+	SCTPChunkTypeSack             SCTPChunkType = 3
+	SCTPChunkTypeHeartbeat        SCTPChunkType = 4
+	SCTPChunkTypeHeartbeatAck     SCTPChunkType = 5
+	SCTPChunkTypeAbort            SCTPChunkType = 6
+	SCTPChunkTypeShutdown         SCTPChunkType = 7
+	SCTPChunkTypeShutdownAck      SCTPChunkType = 8
+	SCTPChunkTypeError            SCTPChunkType = 9
+	SCTPChunkTypeCookieEcho       SCTPChunkType = 10
+	SCTPChunkTypeCookieAck        SCTPChunkType = 11
+	SCTPChunkTypeShutdownComplete SCTPChunkType = 14
+)
+
+// FDDIFrameControl is an enumeration of FDDI frame control bytes.
+type FDDIFrameControl uint8
+
+const (
+	FDDIFrameControlLLC FDDIFrameControl = 0x50
+)
+
+// EAPOLType is an enumeration of EAPOL packet types.
+type EAPOLType uint8
+
+const (
+	EAPOLTypeEAP      EAPOLType = 0
+	EAPOLTypeStart    EAPOLType = 1
+	EAPOLTypeLogOff   EAPOLType = 2
+	EAPOLTypeKey      EAPOLType = 3
+	EAPOLTypeASFAlert EAPOLType = 4
+)
+
+// ProtocolFamily is the set of values defined as PF_* in sys/socket.h
+type ProtocolFamily uint8
+
+const (
+	ProtocolFamilyIPv4 ProtocolFamily = 2
+	// BSDs use different values for INET6... glory be.  These values taken from
+	// tcpdump 4.3.0.
+	ProtocolFamilyIPv6BSD     ProtocolFamily = 24
+	ProtocolFamilyIPv6FreeBSD ProtocolFamily = 28
+	ProtocolFamilyIPv6Darwin  ProtocolFamily = 30
+	ProtocolFamilyIPv6Linux   ProtocolFamily = 10
+)
+
+// Dot11Type is a combination of IEEE 802.11 frame's Type and Subtype fields.
+// By combining these two fields together into a single type, we're able to
+// provide a String function that correctly displays the subtype given the
+// top-level type.
+//
+// If you just care about the top-level type, use the MainType function.
+type Dot11Type uint8
+
+// MainType strips the subtype information from the given type,
+// returning just the overarching type (Mgmt, Ctrl, Data, Reserved).
+func (d Dot11Type) MainType() Dot11Type {
+	return d & dot11TypeMask
+}
+
+func (d Dot11Type) QOS() bool {
+	return d&dot11QOSMask == Dot11TypeDataQOSData
+}
+
+const (
+	Dot11TypeMgmt     Dot11Type = 0x00
+	Dot11TypeCtrl     Dot11Type = 0x01
+	Dot11TypeData     Dot11Type = 0x02
+	Dot11TypeReserved Dot11Type = 0x03
+	dot11TypeMask               = 0x03
+	dot11QOSMask                = 0x23
+
+	// The following are type/subtype conglomerations.
+
+	// Management
+	Dot11TypeMgmtAssociationReq    Dot11Type = 0x00
+	Dot11TypeMgmtAssociationResp   Dot11Type = 0x04
+	Dot11TypeMgmtReassociationReq  Dot11Type = 0x08
+	Dot11TypeMgmtReassociationResp Dot11Type = 0x0c
+	Dot11TypeMgmtProbeReq          Dot11Type = 0x10
+	Dot11TypeMgmtProbeResp         Dot11Type = 0x14
+	Dot11TypeMgmtMeasurementPilot  Dot11Type = 0x18
+	Dot11TypeMgmtBeacon            Dot11Type = 0x20
+	Dot11TypeMgmtATIM              Dot11Type = 0x24
+	Dot11TypeMgmtDisassociation    Dot11Type = 0x28
+	Dot11TypeMgmtAuthentication    Dot11Type = 0x2c
+	Dot11TypeMgmtDeauthentication  Dot11Type = 0x30
+	Dot11TypeMgmtAction            Dot11Type = 0x34
+	Dot11TypeMgmtActionNoAck       Dot11Type = 0x38
+
+	// Control
+	Dot11TypeCtrlWrapper       Dot11Type = 0x1d
+	Dot11TypeCtrlBlockAckReq   Dot11Type = 0x21
+	Dot11TypeCtrlBlockAck      Dot11Type = 0x25
+	Dot11TypeCtrlPowersavePoll Dot11Type = 0x29
+	Dot11TypeCtrlRTS           Dot11Type = 0x2d
+	Dot11TypeCtrlCTS           Dot11Type = 0x31
+	Dot11TypeCtrlAck           Dot11Type = 0x35
+	Dot11TypeCtrlCFEnd         Dot11Type = 0x39
+	Dot11TypeCtrlCFEndAck      Dot11Type = 0x3d
+
+	// Data
+	Dot11TypeDataCFAck              Dot11Type = 0x06
+	Dot11TypeDataCFPoll             Dot11Type = 0x0a
+	Dot11TypeDataCFAckPoll          Dot11Type = 0x0e
+	Dot11TypeDataNull               Dot11Type = 0x12
+	Dot11TypeDataCFAckNoData        Dot11Type = 0x16
+	Dot11TypeDataCFPollNoData       Dot11Type = 0x1a
+	Dot11TypeDataCFAckPollNoData    Dot11Type = 0x1e
+	Dot11TypeDataQOSData            Dot11Type = 0x22
+	Dot11TypeDataQOSDataCFAck       Dot11Type = 0x26
+	Dot11TypeDataQOSDataCFPoll      Dot11Type = 0x2a
+	Dot11TypeDataQOSDataCFAckPoll   Dot11Type = 0x2e
+	Dot11TypeDataQOSNull            Dot11Type = 0x32
+	Dot11TypeDataQOSCFPollNoData    Dot11Type = 0x3a
+	Dot11TypeDataQOSCFAckPollNoData Dot11Type = 0x3e
+)
+
+// Decode a raw v4 or v6 IP packet.
+func decodeIPv4or6(data []byte, p gopacket.PacketBuilder) error {
+	version := data[0] >> 4
+	switch version {
+	case 4:
+		return decodeIPv4(data, p)
+	case 6:
+		return decodeIPv6(data, p)
+	}
+	return fmt.Errorf("Invalid IP packet version %v", version)
+}
+
+func initActualTypeData() {
+	// Each of the XXXTypeMetadata arrays contains mappings of how to handle enum
+	// values for various enum types in gopacket/layers.
+	// These arrays are actually created by gen2.go and stored in
+	// enums_generated.go.
+	//
+	// So, EthernetTypeMetadata[2] contains information on how to handle EthernetType
+	// 2, including which name to give it and which decoder to use to decode
+	// packet data of that type.  These arrays are filled by default with all of the
+	// protocols gopacket/layers knows how to handle, but users of the library can
+	// add new decoders or override existing ones.  For example, if you write a better
+	// TCP decoder, you can override IPProtocolMetadata[IPProtocolTCP].DecodeWith
+	// with your new decoder, and all gopacket/layers decoding will use your new
+	// decoder whenever they encounter that IPProtocol.
+
+	// Here we link up all enumerations with their respective names and decoders.
+	EthernetTypeMetadata[EthernetTypeLLC] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeLLC), Name: "LLC", LayerType: LayerTypeLLC}
+	EthernetTypeMetadata[EthernetTypeIPv4] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeIPv4), Name: "IPv4", LayerType: LayerTypeIPv4}
+	EthernetTypeMetadata[EthernetTypeIPv6] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeIPv6), Name: "IPv6", LayerType: LayerTypeIPv6}
+	EthernetTypeMetadata[EthernetTypeARP] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeARP), Name: "ARP", LayerType: LayerTypeARP}
+	EthernetTypeMetadata[EthernetTypeDot1Q] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeDot1Q), Name: "Dot1Q", LayerType: LayerTypeDot1Q}
+	EthernetTypeMetadata[EthernetTypePPP] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodePPP), Name: "PPP", LayerType: LayerTypePPP}
+	EthernetTypeMetadata[EthernetTypePPPoEDiscovery] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodePPPoE), Name: "PPPoEDiscovery", LayerType: LayerTypePPPoE}
+	EthernetTypeMetadata[EthernetTypePPPoESession] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodePPPoE), Name: "PPPoESession", LayerType: LayerTypePPPoE}
+	EthernetTypeMetadata[EthernetTypeEthernetCTP] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeEthernetCTP), Name: "EthernetCTP", LayerType: LayerTypeEthernetCTP}
+	EthernetTypeMetadata[EthernetTypeCiscoDiscovery] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeCiscoDiscovery), Name: "CiscoDiscovery", LayerType: LayerTypeCiscoDiscovery}
+	EthernetTypeMetadata[EthernetTypeNortelDiscovery] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeNortelDiscovery), Name: "NortelDiscovery", LayerType: LayerTypeNortelDiscovery}
+	EthernetTypeMetadata[EthernetTypeLinkLayerDiscovery] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeLinkLayerDiscovery), Name: "LinkLayerDiscovery", LayerType: LayerTypeLinkLayerDiscovery}
+	EthernetTypeMetadata[EthernetTypeMPLSUnicast] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeMPLS), Name: "MPLSUnicast", LayerType: LayerTypeMPLS}
+	EthernetTypeMetadata[EthernetTypeMPLSMulticast] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeMPLS), Name: "MPLSMulticast", LayerType: LayerTypeMPLS}
+	EthernetTypeMetadata[EthernetTypeEAPOL] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeEAPOL), Name: "EAPOL", LayerType: LayerTypeEAPOL}
+	EthernetTypeMetadata[EthernetTypeQinQ] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeDot1Q), Name: "Dot1Q", LayerType: LayerTypeDot1Q}
+	EthernetTypeMetadata[EthernetTypeTransparentEthernetBridging] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeEthernet), Name: "TransparentEthernetBridging", LayerType: LayerTypeEthernet}
+	EthernetTypeMetadata[EthernetTypeERSPAN] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeERSPANII), Name: "ERSPAN Type II", LayerType: LayerTypeERSPANII}
+
+	IPProtocolMetadata[IPProtocolIPv4] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeIPv4), Name: "IPv4", LayerType: LayerTypeIPv4}
+	IPProtocolMetadata[IPProtocolTCP] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeTCP), Name: "TCP", LayerType: LayerTypeTCP}
+	IPProtocolMetadata[IPProtocolUDP] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeUDP), Name: "UDP", LayerType: LayerTypeUDP}
+	IPProtocolMetadata[IPProtocolICMPv4] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeICMPv4), Name: "ICMPv4", LayerType: LayerTypeICMPv4}
+	IPProtocolMetadata[IPProtocolICMPv6] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeICMPv6), Name: "ICMPv6", LayerType: LayerTypeICMPv6}
+	IPProtocolMetadata[IPProtocolSCTP] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeSCTP), Name: "SCTP", LayerType: LayerTypeSCTP}
+	IPProtocolMetadata[IPProtocolIPv6] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeIPv6), Name: "IPv6", LayerType: LayerTypeIPv6}
+	IPProtocolMetadata[IPProtocolIPIP] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeIPv4), Name: "IPv4", LayerType: LayerTypeIPv4}
+	IPProtocolMetadata[IPProtocolEtherIP] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeEtherIP), Name: "EtherIP", LayerType: LayerTypeEtherIP}
+	IPProtocolMetadata[IPProtocolRUDP] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeRUDP), Name: "RUDP", LayerType: LayerTypeRUDP}
+	IPProtocolMetadata[IPProtocolGRE] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeGRE), Name: "GRE", LayerType: LayerTypeGRE}
+	IPProtocolMetadata[IPProtocolIPv6HopByHop] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeIPv6HopByHop), Name: "IPv6HopByHop", LayerType: LayerTypeIPv6HopByHop}
+	IPProtocolMetadata[IPProtocolIPv6Routing] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeIPv6Routing), Name: "IPv6Routing", LayerType: LayerTypeIPv6Routing}
+	IPProtocolMetadata[IPProtocolIPv6Fragment] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeIPv6Fragment), Name: "IPv6Fragment", LayerType: LayerTypeIPv6Fragment}
+	IPProtocolMetadata[IPProtocolIPv6Destination] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeIPv6Destination), Name: "IPv6Destination", LayerType: LayerTypeIPv6Destination}
+	IPProtocolMetadata[IPProtocolOSPF] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeOSPF), Name: "OSPF", LayerType: LayerTypeOSPF}
+	IPProtocolMetadata[IPProtocolAH] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeIPSecAH), Name: "IPSecAH", LayerType: LayerTypeIPSecAH}
+	IPProtocolMetadata[IPProtocolESP] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeIPSecESP), Name: "IPSecESP", LayerType: LayerTypeIPSecESP}
+	IPProtocolMetadata[IPProtocolUDPLite] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeUDPLite), Name: "UDPLite", LayerType: LayerTypeUDPLite}
+	IPProtocolMetadata[IPProtocolMPLSInIP] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeMPLS), Name: "MPLS", LayerType: LayerTypeMPLS}
+	IPProtocolMetadata[IPProtocolNoNextHeader] = EnumMetadata{DecodeWith: gopacket.DecodePayload, Name: "NoNextHeader", LayerType: gopacket.LayerTypePayload}
+	IPProtocolMetadata[IPProtocolIGMP] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeIGMP), Name: "IGMP", LayerType: LayerTypeIGMP}
+	IPProtocolMetadata[IPProtocolVRRP] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeVRRP), Name: "VRRP", LayerType: LayerTypeVRRP}
+
+	SCTPChunkTypeMetadata[SCTPChunkTypeData] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeSCTPData), Name: "Data"}
+	SCTPChunkTypeMetadata[SCTPChunkTypeInit] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeSCTPInit), Name: "Init"}
+	SCTPChunkTypeMetadata[SCTPChunkTypeInitAck] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeSCTPInit), Name: "InitAck"}
+	SCTPChunkTypeMetadata[SCTPChunkTypeSack] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeSCTPSack), Name: "Sack"}
+	SCTPChunkTypeMetadata[SCTPChunkTypeHeartbeat] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeSCTPHeartbeat), Name: "Heartbeat"}
+	SCTPChunkTypeMetadata[SCTPChunkTypeHeartbeatAck] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeSCTPHeartbeat), Name: "HeartbeatAck"}
+	SCTPChunkTypeMetadata[SCTPChunkTypeAbort] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeSCTPError), Name: "Abort"}
+	SCTPChunkTypeMetadata[SCTPChunkTypeError] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeSCTPError), Name: "Error"}
+	SCTPChunkTypeMetadata[SCTPChunkTypeShutdown] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeSCTPShutdown), Name: "Shutdown"}
+	SCTPChunkTypeMetadata[SCTPChunkTypeShutdownAck] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeSCTPShutdownAck), Name: "ShutdownAck"}
+	SCTPChunkTypeMetadata[SCTPChunkTypeCookieEcho] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeSCTPCookieEcho), Name: "CookieEcho"}
+	SCTPChunkTypeMetadata[SCTPChunkTypeCookieAck] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeSCTPEmptyLayer), Name: "CookieAck"}
+	SCTPChunkTypeMetadata[SCTPChunkTypeShutdownComplete] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeSCTPEmptyLayer), Name: "ShutdownComplete"}
+
+	PPPTypeMetadata[PPPTypeIPv4] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeIPv4), Name: "IPv4"}
+	PPPTypeMetadata[PPPTypeIPv6] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeIPv6), Name: "IPv6"}
+	PPPTypeMetadata[PPPTypeMPLSUnicast] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeMPLS), Name: "MPLSUnicast"}
+	PPPTypeMetadata[PPPTypeMPLSMulticast] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeMPLS), Name: "MPLSMulticast"}
+
+	PPPoECodeMetadata[PPPoECodeSession] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodePPP), Name: "PPP"}
+
+	LinkTypeMetadata[LinkTypeEthernet] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeEthernet), Name: "Ethernet"}
+	LinkTypeMetadata[LinkTypePPP] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodePPP), Name: "PPP"}
+	LinkTypeMetadata[LinkTypeFDDI] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeFDDI), Name: "FDDI"}
+	LinkTypeMetadata[LinkTypeNull] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeLoopback), Name: "Null"}
+	LinkTypeMetadata[LinkTypeIEEE802_11] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeDot11), Name: "Dot11"}
+	LinkTypeMetadata[LinkTypeLoop] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeLoopback), Name: "Loop"}
+	LinkTypeMetadata[LinkTypeIEEE802_11] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeDot11), Name: "802.11"}
+	LinkTypeMetadata[LinkTypeRaw] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeIPv4or6), Name: "Raw"}
+	// See https://github.com/the-tcpdump-group/libpcap/blob/170f717e6e818cdc4bcbbfd906b63088eaa88fa0/pcap/dlt.h#L85
+	// Or https://github.com/wireshark/wireshark/blob/854cfe53efe44080609c78053ecfb2342ad84a08/wiretap/pcap-common.c#L508
+	if runtime.GOOS == "openbsd" {
+		LinkTypeMetadata[14] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeIPv4or6), Name: "Raw"}
+	} else {
+		LinkTypeMetadata[12] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeIPv4or6), Name: "Raw"}
+	}
+	LinkTypeMetadata[LinkTypePFLog] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodePFLog), Name: "PFLog"}
+	LinkTypeMetadata[LinkTypeIEEE80211Radio] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeRadioTap), Name: "RadioTap"}
+	LinkTypeMetadata[LinkTypeLinuxUSB] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeUSB), Name: "USB"}
+	LinkTypeMetadata[LinkTypeLinuxSLL] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeLinuxSLL), Name: "Linux SLL"}
+	LinkTypeMetadata[LinkTypePrismHeader] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodePrismHeader), Name: "Prism"}
+
+	FDDIFrameControlMetadata[FDDIFrameControlLLC] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeLLC), Name: "LLC"}
+
+	EAPOLTypeMetadata[EAPOLTypeEAP] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeEAP), Name: "EAP", LayerType: LayerTypeEAP}
+	EAPOLTypeMetadata[EAPOLTypeKey] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeEAPOLKey), Name: "EAPOLKey", LayerType: LayerTypeEAPOLKey}
+
+	ProtocolFamilyMetadata[ProtocolFamilyIPv4] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeIPv4), Name: "IPv4", LayerType: LayerTypeIPv4}
+	ProtocolFamilyMetadata[ProtocolFamilyIPv6BSD] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeIPv6), Name: "IPv6", LayerType: LayerTypeIPv6}
+	ProtocolFamilyMetadata[ProtocolFamilyIPv6FreeBSD] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeIPv6), Name: "IPv6", LayerType: LayerTypeIPv6}
+	ProtocolFamilyMetadata[ProtocolFamilyIPv6Darwin] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeIPv6), Name: "IPv6", LayerType: LayerTypeIPv6}
+	ProtocolFamilyMetadata[ProtocolFamilyIPv6Linux] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeIPv6), Name: "IPv6", LayerType: LayerTypeIPv6}
+
+	Dot11TypeMetadata[Dot11TypeMgmtAssociationReq] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeDot11MgmtAssociationReq), Name: "MgmtAssociationReq", LayerType: LayerTypeDot11MgmtAssociationReq}
+	Dot11TypeMetadata[Dot11TypeMgmtAssociationResp] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeDot11MgmtAssociationResp), Name: "MgmtAssociationResp", LayerType: LayerTypeDot11MgmtAssociationResp}
+	Dot11TypeMetadata[Dot11TypeMgmtReassociationReq] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeDot11MgmtReassociationReq), Name: "MgmtReassociationReq", LayerType: LayerTypeDot11MgmtReassociationReq}
+	Dot11TypeMetadata[Dot11TypeMgmtReassociationResp] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeDot11MgmtReassociationResp), Name: "MgmtReassociationResp", LayerType: LayerTypeDot11MgmtReassociationResp}
+	Dot11TypeMetadata[Dot11TypeMgmtProbeReq] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeDot11MgmtProbeReq), Name: "MgmtProbeReq", LayerType: LayerTypeDot11MgmtProbeReq}
+	Dot11TypeMetadata[Dot11TypeMgmtProbeResp] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeDot11MgmtProbeResp), Name: "MgmtProbeResp", LayerType: LayerTypeDot11MgmtProbeResp}
+	Dot11TypeMetadata[Dot11TypeMgmtMeasurementPilot] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeDot11MgmtMeasurementPilot), Name: "MgmtMeasurementPilot", LayerType: LayerTypeDot11MgmtMeasurementPilot}
+	Dot11TypeMetadata[Dot11TypeMgmtBeacon] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeDot11MgmtBeacon), Name: "MgmtBeacon", LayerType: LayerTypeDot11MgmtBeacon}
+	Dot11TypeMetadata[Dot11TypeMgmtATIM] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeDot11MgmtATIM), Name: "MgmtATIM", LayerType: LayerTypeDot11MgmtATIM}
+	Dot11TypeMetadata[Dot11TypeMgmtDisassociation] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeDot11MgmtDisassociation), Name: "MgmtDisassociation", LayerType: LayerTypeDot11MgmtDisassociation}
+	Dot11TypeMetadata[Dot11TypeMgmtAuthentication] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeDot11MgmtAuthentication), Name: "MgmtAuthentication", LayerType: LayerTypeDot11MgmtAuthentication}
+	Dot11TypeMetadata[Dot11TypeMgmtDeauthentication] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeDot11MgmtDeauthentication), Name: "MgmtDeauthentication", LayerType: LayerTypeDot11MgmtDeauthentication}
+	Dot11TypeMetadata[Dot11TypeMgmtAction] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeDot11MgmtAction), Name: "MgmtAction", LayerType: LayerTypeDot11MgmtAction}
+	Dot11TypeMetadata[Dot11TypeMgmtActionNoAck] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeDot11MgmtActionNoAck), Name: "MgmtActionNoAck", LayerType: LayerTypeDot11MgmtActionNoAck}
+	Dot11TypeMetadata[Dot11TypeCtrl] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeDot11Ctrl), Name: "Ctrl", LayerType: LayerTypeDot11Ctrl}
+	Dot11TypeMetadata[Dot11TypeCtrlWrapper] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeDot11Ctrl), Name: "CtrlWrapper", LayerType: LayerTypeDot11Ctrl}
+	Dot11TypeMetadata[Dot11TypeCtrlBlockAckReq] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeDot11CtrlBlockAckReq), Name: "CtrlBlockAckReq", LayerType: LayerTypeDot11CtrlBlockAckReq}
+	Dot11TypeMetadata[Dot11TypeCtrlBlockAck] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeDot11CtrlBlockAck), Name: "CtrlBlockAck", LayerType: LayerTypeDot11CtrlBlockAck}
+	Dot11TypeMetadata[Dot11TypeCtrlPowersavePoll] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeDot11CtrlPowersavePoll), Name: "CtrlPowersavePoll", LayerType: LayerTypeDot11CtrlPowersavePoll}
+	Dot11TypeMetadata[Dot11TypeCtrlRTS] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeDot11CtrlRTS), Name: "CtrlRTS", LayerType: LayerTypeDot11CtrlRTS}
+	Dot11TypeMetadata[Dot11TypeCtrlCTS] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeDot11CtrlCTS), Name: "CtrlCTS", LayerType: LayerTypeDot11CtrlCTS}
+	Dot11TypeMetadata[Dot11TypeCtrlAck] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeDot11CtrlAck), Name: "CtrlAck", LayerType: LayerTypeDot11CtrlAck}
+	Dot11TypeMetadata[Dot11TypeCtrlCFEnd] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeDot11CtrlCFEnd), Name: "CtrlCFEnd", LayerType: LayerTypeDot11CtrlCFEnd}
+	Dot11TypeMetadata[Dot11TypeCtrlCFEndAck] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeDot11CtrlCFEndAck), Name: "CtrlCFEndAck", LayerType: LayerTypeDot11CtrlCFEndAck}
+	Dot11TypeMetadata[Dot11TypeData] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeDot11Data), Name: "Data", LayerType: LayerTypeDot11Data}
+	Dot11TypeMetadata[Dot11TypeDataCFAck] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeDot11DataCFAck), Name: "DataCFAck", LayerType: LayerTypeDot11DataCFAck}
+	Dot11TypeMetadata[Dot11TypeDataCFPoll] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeDot11DataCFPoll), Name: "DataCFPoll", LayerType: LayerTypeDot11DataCFPoll}
+	Dot11TypeMetadata[Dot11TypeDataCFAckPoll] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeDot11DataCFAckPoll), Name: "DataCFAckPoll", LayerType: LayerTypeDot11DataCFAckPoll}
+	Dot11TypeMetadata[Dot11TypeDataNull] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeDot11DataNull), Name: "DataNull", LayerType: LayerTypeDot11DataNull}
+	Dot11TypeMetadata[Dot11TypeDataCFAckNoData] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeDot11DataCFAckNoData), Name: "DataCFAckNoData", LayerType: LayerTypeDot11DataCFAckNoData}
+	Dot11TypeMetadata[Dot11TypeDataCFPollNoData] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeDot11DataCFPollNoData), Name: "DataCFPollNoData", LayerType: LayerTypeDot11DataCFPollNoData}
+	Dot11TypeMetadata[Dot11TypeDataCFAckPollNoData] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeDot11DataCFAckPollNoData), Name: "DataCFAckPollNoData", LayerType: LayerTypeDot11DataCFAckPollNoData}
+	Dot11TypeMetadata[Dot11TypeDataQOSData] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeDot11DataQOSData), Name: "DataQOSData", LayerType: LayerTypeDot11DataQOSData}
+	Dot11TypeMetadata[Dot11TypeDataQOSDataCFAck] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeDot11DataQOSDataCFAck), Name: "DataQOSDataCFAck", LayerType: LayerTypeDot11DataQOSDataCFAck}
+	Dot11TypeMetadata[Dot11TypeDataQOSDataCFPoll] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeDot11DataQOSDataCFPoll), Name: "DataQOSDataCFPoll", LayerType: LayerTypeDot11DataQOSDataCFPoll}
+	Dot11TypeMetadata[Dot11TypeDataQOSDataCFAckPoll] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeDot11DataQOSDataCFAckPoll), Name: "DataQOSDataCFAckPoll", LayerType: LayerTypeDot11DataQOSDataCFAckPoll}
+	Dot11TypeMetadata[Dot11TypeDataQOSNull] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeDot11DataQOSNull), Name: "DataQOSNull", LayerType: LayerTypeDot11DataQOSNull}
+	Dot11TypeMetadata[Dot11TypeDataQOSCFPollNoData] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeDot11DataQOSCFPollNoData), Name: "DataQOSCFPollNoData", LayerType: LayerTypeDot11DataQOSCFPollNoData}
+	Dot11TypeMetadata[Dot11TypeDataQOSCFAckPollNoData] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeDot11DataQOSCFAckPollNoData), Name: "DataQOSCFAckPollNoData", LayerType: LayerTypeDot11DataQOSCFAckPollNoData}
+
+	USBTransportTypeMetadata[USBTransportTypeInterrupt] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeUSBInterrupt), Name: "Interrupt", LayerType: LayerTypeUSBInterrupt}
+	USBTransportTypeMetadata[USBTransportTypeControl] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeUSBControl), Name: "Control", LayerType: LayerTypeUSBControl}
+	USBTransportTypeMetadata[USBTransportTypeBulk] = EnumMetadata{DecodeWith: gopacket.DecodeFunc(decodeUSBBulk), Name: "Bulk", LayerType: LayerTypeUSBBulk}
+}

vendor/github.com/google/gopacket/layers/enums_generated.go

@@ -0,0 +1,434 @@
+// Copyright 2012 Google, Inc. All rights reserved.
+
+package layers
+
+// Created by gen2.go, don't edit manually
+// Generated at 2017-10-23 10:20:24.458771856 -0600 MDT m=+0.001159033
+
+import (
+	"fmt"
+
+	"github.com/google/gopacket"
+)
+
+func init() {
+	initUnknownTypesForLinkType()
+	initUnknownTypesForEthernetType()
+	initUnknownTypesForPPPType()
+	initUnknownTypesForIPProtocol()
+	initUnknownTypesForSCTPChunkType()
+	initUnknownTypesForPPPoECode()
+	initUnknownTypesForFDDIFrameControl()
+	initUnknownTypesForEAPOLType()
+	initUnknownTypesForProtocolFamily()
+	initUnknownTypesForDot11Type()
+	initUnknownTypesForUSBTransportType()
+	initActualTypeData()
+}
+
+// Decoder calls LinkTypeMetadata.DecodeWith's decoder.
+func (a LinkType) Decode(data []byte, p gopacket.PacketBuilder) error {
+	return LinkTypeMetadata[a].DecodeWith.Decode(data, p)
+}
+
+// String returns LinkTypeMetadata.Name.
+func (a LinkType) String() string {
+	return LinkTypeMetadata[a].Name
+}
+
+// LayerType returns LinkTypeMetadata.LayerType.
+func (a LinkType) LayerType() gopacket.LayerType {
+	return LinkTypeMetadata[a].LayerType
+}
+
+type errorDecoderForLinkType int
+
+func (a *errorDecoderForLinkType) Decode(data []byte, p gopacket.PacketBuilder) error {
+	return a
+}
+func (a *errorDecoderForLinkType) Error() string {
+	return fmt.Sprintf("Unable to decode LinkType %d", int(*a))
+}
+
+var errorDecodersForLinkType [256]errorDecoderForLinkType
+var LinkTypeMetadata [256]EnumMetadata
+
+func initUnknownTypesForLinkType() {
+	for i := 0; i < 256; i++ {
+		errorDecodersForLinkType[i] = errorDecoderForLinkType(i)
+		LinkTypeMetadata[i] = EnumMetadata{
+			DecodeWith: &errorDecodersForLinkType[i],
+			Name:       "UnknownLinkType",
+		}
+	}
+}
+
+// Decoder calls EthernetTypeMetadata.DecodeWith's decoder.
+func (a EthernetType) Decode(data []byte, p gopacket.PacketBuilder) error {
+	return EthernetTypeMetadata[a].DecodeWith.Decode(data, p)
+}
+
+// String returns EthernetTypeMetadata.Name.
+func (a EthernetType) String() string {
+	return EthernetTypeMetadata[a].Name
+}
+
+// LayerType returns EthernetTypeMetadata.LayerType.
+func (a EthernetType) LayerType() gopacket.LayerType {
+	return EthernetTypeMetadata[a].LayerType
+}
+
+type errorDecoderForEthernetType int
+
+func (a *errorDecoderForEthernetType) Decode(data []byte, p gopacket.PacketBuilder) error {
+	return a
+}
+func (a *errorDecoderForEthernetType) Error() string {
+	return fmt.Sprintf("Unable to decode EthernetType %d", int(*a))
+}
+
+var errorDecodersForEthernetType [65536]errorDecoderForEthernetType
+var EthernetTypeMetadata [65536]EnumMetadata
+
+func initUnknownTypesForEthernetType() {
+	for i := 0; i < 65536; i++ {
+		errorDecodersForEthernetType[i] = errorDecoderForEthernetType(i)
+		EthernetTypeMetadata[i] = EnumMetadata{
+			DecodeWith: &errorDecodersForEthernetType[i],
+			Name:       "UnknownEthernetType",
+		}
+	}
+}
+
+// Decoder calls PPPTypeMetadata.DecodeWith's decoder.
+func (a PPPType) Decode(data []byte, p gopacket.PacketBuilder) error {
+	return PPPTypeMetadata[a].DecodeWith.Decode(data, p)
+}
+
+// String returns PPPTypeMetadata.Name.
+func (a PPPType) String() string {
+	return PPPTypeMetadata[a].Name
+}
+
+// LayerType returns PPPTypeMetadata.LayerType.
+func (a PPPType) LayerType() gopacket.LayerType {
+	return PPPTypeMetadata[a].LayerType
+}
+
+type errorDecoderForPPPType int
+
+func (a *errorDecoderForPPPType) Decode(data []byte, p gopacket.PacketBuilder) error {
+	return a
+}
+func (a *errorDecoderForPPPType) Error() string {
+	return fmt.Sprintf("Unable to decode PPPType %d", int(*a))
+}
+
+var errorDecodersForPPPType [65536]errorDecoderForPPPType
+var PPPTypeMetadata [65536]EnumMetadata
+
+func initUnknownTypesForPPPType() {
+	for i := 0; i < 65536; i++ {
+		errorDecodersForPPPType[i] = errorDecoderForPPPType(i)
+		PPPTypeMetadata[i] = EnumMetadata{
+			DecodeWith: &errorDecodersForPPPType[i],
+			Name:       "UnknownPPPType",
+		}
+	}
+}
+
+// Decoder calls IPProtocolMetadata.DecodeWith's decoder.
+func (a IPProtocol) Decode(data []byte, p gopacket.PacketBuilder) error {
+	return IPProtocolMetadata[a].DecodeWith.Decode(data, p)
+}
+
+// String returns IPProtocolMetadata.Name.
+func (a IPProtocol) String() string {
+	return IPProtocolMetadata[a].Name
+}
+
+// LayerType returns IPProtocolMetadata.LayerType.
+func (a IPProtocol) LayerType() gopacket.LayerType {
+	return IPProtocolMetadata[a].LayerType
+}
+
+type errorDecoderForIPProtocol int
+
+func (a *errorDecoderForIPProtocol) Decode(data []byte, p gopacket.PacketBuilder) error {
+	return a
+}
+func (a *errorDecoderForIPProtocol) Error() string {
+	return fmt.Sprintf("Unable to decode IPProtocol %d", int(*a))
+}
+
+var errorDecodersForIPProtocol [256]errorDecoderForIPProtocol
+var IPProtocolMetadata [256]EnumMetadata
+
+func initUnknownTypesForIPProtocol() {
+	for i := 0; i < 256; i++ {
+		errorDecodersForIPProtocol[i] = errorDecoderForIPProtocol(i)
+		IPProtocolMetadata[i] = EnumMetadata{
+			DecodeWith: &errorDecodersForIPProtocol[i],
+			Name:       "UnknownIPProtocol",
+		}
+	}
+}
+
+// Decoder calls SCTPChunkTypeMetadata.DecodeWith's decoder.
+func (a SCTPChunkType) Decode(data []byte, p gopacket.PacketBuilder) error {
+	return SCTPChunkTypeMetadata[a].DecodeWith.Decode(data, p)
+}
+
+// String returns SCTPChunkTypeMetadata.Name.
+func (a SCTPChunkType) String() string {
+	return SCTPChunkTypeMetadata[a].Name
+}
+
+// LayerType returns SCTPChunkTypeMetadata.LayerType.
+func (a SCTPChunkType) LayerType() gopacket.LayerType {
+	return SCTPChunkTypeMetadata[a].LayerType
+}
+
+type errorDecoderForSCTPChunkType int
+
+func (a *errorDecoderForSCTPChunkType) Decode(data []byte, p gopacket.PacketBuilder) error {
+	return a
+}
+func (a *errorDecoderForSCTPChunkType) Error() string {
+	return fmt.Sprintf("Unable to decode SCTPChunkType %d", int(*a))
+}
+
+var errorDecodersForSCTPChunkType [256]errorDecoderForSCTPChunkType
+var SCTPChunkTypeMetadata [256]EnumMetadata
+
+func initUnknownTypesForSCTPChunkType() {
+	for i := 0; i < 256; i++ {
+		errorDecodersForSCTPChunkType[i] = errorDecoderForSCTPChunkType(i)
+		SCTPChunkTypeMetadata[i] = EnumMetadata{
+			DecodeWith: &errorDecodersForSCTPChunkType[i],
+			Name:       "UnknownSCTPChunkType",
+		}
+	}
+}
+
+// Decoder calls PPPoECodeMetadata.DecodeWith's decoder.
+func (a PPPoECode) Decode(data []byte, p gopacket.PacketBuilder) error {
+	return PPPoECodeMetadata[a].DecodeWith.Decode(data, p)
+}
+
+// String returns PPPoECodeMetadata.Name.
+func (a PPPoECode) String() string {
+	return PPPoECodeMetadata[a].Name
+}
+
+// LayerType returns PPPoECodeMetadata.LayerType.
+func (a PPPoECode) LayerType() gopacket.LayerType {
+	return PPPoECodeMetadata[a].LayerType
+}
+
+type errorDecoderForPPPoECode int
+
+func (a *errorDecoderForPPPoECode) Decode(data []byte, p gopacket.PacketBuilder) error {
+	return a
+}
+func (a *errorDecoderForPPPoECode) Error() string {
+	return fmt.Sprintf("Unable to decode PPPoECode %d", int(*a))
+}
+
+var errorDecodersForPPPoECode [256]errorDecoderForPPPoECode
+var PPPoECodeMetadata [256]EnumMetadata
+
+func initUnknownTypesForPPPoECode() {
+	for i := 0; i < 256; i++ {
+		errorDecodersForPPPoECode[i] = errorDecoderForPPPoECode(i)
+		PPPoECodeMetadata[i] = EnumMetadata{
+			DecodeWith: &errorDecodersForPPPoECode[i],
+			Name:       "UnknownPPPoECode",
+		}
+	}
+}
+
+// Decoder calls FDDIFrameControlMetadata.DecodeWith's decoder.
+func (a FDDIFrameControl) Decode(data []byte, p gopacket.PacketBuilder) error {
+	return FDDIFrameControlMetadata[a].DecodeWith.Decode(data, p)
+}
+
+// String returns FDDIFrameControlMetadata.Name.
+func (a FDDIFrameControl) String() string {
+	return FDDIFrameControlMetadata[a].Name
+}
+
+// LayerType returns FDDIFrameControlMetadata.LayerType.
+func (a FDDIFrameControl) LayerType() gopacket.LayerType {
+	return FDDIFrameControlMetadata[a].LayerType
+}
+
+type errorDecoderForFDDIFrameControl int
+
+func (a *errorDecoderForFDDIFrameControl) Decode(data []byte, p gopacket.PacketBuilder) error {
+	return a
+}
+func (a *errorDecoderForFDDIFrameControl) Error() string {
+	return fmt.Sprintf("Unable to decode FDDIFrameControl %d", int(*a))
+}
+
+var errorDecodersForFDDIFrameControl [256]errorDecoderForFDDIFrameControl
+var FDDIFrameControlMetadata [256]EnumMetadata
+
+func initUnknownTypesForFDDIFrameControl() {
+	for i := 0; i < 256; i++ {
+		errorDecodersForFDDIFrameControl[i] = errorDecoderForFDDIFrameControl(i)
+		FDDIFrameControlMetadata[i] = EnumMetadata{
+			DecodeWith: &errorDecodersForFDDIFrameControl[i],
+			Name:       "UnknownFDDIFrameControl",
+		}
+	}
+}
+
+// Decoder calls EAPOLTypeMetadata.DecodeWith's decoder.
+func (a EAPOLType) Decode(data []byte, p gopacket.PacketBuilder) error {
+	return EAPOLTypeMetadata[a].DecodeWith.Decode(data, p)
+}
+
+// String returns EAPOLTypeMetadata.Name.
+func (a EAPOLType) String() string {
+	return EAPOLTypeMetadata[a].Name
+}
+
+// LayerType returns EAPOLTypeMetadata.LayerType.
+func (a EAPOLType) LayerType() gopacket.LayerType {
+	return EAPOLTypeMetadata[a].LayerType
+}
+
+type errorDecoderForEAPOLType int
+
+func (a *errorDecoderForEAPOLType) Decode(data []byte, p gopacket.PacketBuilder) error {
+	return a
+}
+func (a *errorDecoderForEAPOLType) Error() string {
+	return fmt.Sprintf("Unable to decode EAPOLType %d", int(*a))
+}
+
+var errorDecodersForEAPOLType [256]errorDecoderForEAPOLType
+var EAPOLTypeMetadata [256]EnumMetadata
+
+func initUnknownTypesForEAPOLType() {
+	for i := 0; i < 256; i++ {
+		errorDecodersForEAPOLType[i] = errorDecoderForEAPOLType(i)
+		EAPOLTypeMetadata[i] = EnumMetadata{
+			DecodeWith: &errorDecodersForEAPOLType[i],
+			Name:       "UnknownEAPOLType",
+		}
+	}
+}
+
+// Decoder calls ProtocolFamilyMetadata.DecodeWith's decoder.
+func (a ProtocolFamily) Decode(data []byte, p gopacket.PacketBuilder) error {
+	return ProtocolFamilyMetadata[a].DecodeWith.Decode(data, p)
+}
+
+// String returns ProtocolFamilyMetadata.Name.
+func (a ProtocolFamily) String() string {
+	return ProtocolFamilyMetadata[a].Name
+}
+
+// LayerType returns ProtocolFamilyMetadata.LayerType.
+func (a ProtocolFamily) LayerType() gopacket.LayerType {
+	return ProtocolFamilyMetadata[a].LayerType
+}
+
+type errorDecoderForProtocolFamily int
+
+func (a *errorDecoderForProtocolFamily) Decode(data []byte, p gopacket.PacketBuilder) error {
+	return a
+}
+func (a *errorDecoderForProtocolFamily) Error() string {
+	return fmt.Sprintf("Unable to decode ProtocolFamily %d", int(*a))
+}
+
+var errorDecodersForProtocolFamily [256]errorDecoderForProtocolFamily
+var ProtocolFamilyMetadata [256]EnumMetadata
+
+func initUnknownTypesForProtocolFamily() {
+	for i := 0; i < 256; i++ {
+		errorDecodersForProtocolFamily[i] = errorDecoderForProtocolFamily(i)
+		ProtocolFamilyMetadata[i] = EnumMetadata{
+			DecodeWith: &errorDecodersForProtocolFamily[i],
+			Name:       "UnknownProtocolFamily",
+		}
+	}
+}
+
+// Decoder calls Dot11TypeMetadata.DecodeWith's decoder.
+func (a Dot11Type) Decode(data []byte, p gopacket.PacketBuilder) error {
+	return Dot11TypeMetadata[a].DecodeWith.Decode(data, p)
+}
+
+// String returns Dot11TypeMetadata.Name.
+func (a Dot11Type) String() string {
+	return Dot11TypeMetadata[a].Name
+}
+
+// LayerType returns Dot11TypeMetadata.LayerType.
+func (a Dot11Type) LayerType() gopacket.LayerType {
+	return Dot11TypeMetadata[a].LayerType
+}
+
+type errorDecoderForDot11Type int
+
+func (a *errorDecoderForDot11Type) Decode(data []byte, p gopacket.PacketBuilder) error {
+	return a
+}
+func (a *errorDecoderForDot11Type) Error() string {
+	return fmt.Sprintf("Unable to decode Dot11Type %d", int(*a))
+}
+
+var errorDecodersForDot11Type [256]errorDecoderForDot11Type
+var Dot11TypeMetadata [256]EnumMetadata
+
+func initUnknownTypesForDot11Type() {
+	for i := 0; i < 256; i++ {
+		errorDecodersForDot11Type[i] = errorDecoderForDot11Type(i)
+		Dot11TypeMetadata[i] = EnumMetadata{
+			DecodeWith: &errorDecodersForDot11Type[i],
+			Name:       "UnknownDot11Type",
+		}
+	}
+}
+
+// Decoder calls USBTransportTypeMetadata.DecodeWith's decoder.
+func (a USBTransportType) Decode(data []byte, p gopacket.PacketBuilder) error {
+	return USBTransportTypeMetadata[a].DecodeWith.Decode(data, p)
+}
+
+// String returns USBTransportTypeMetadata.Name.
+func (a USBTransportType) String() string {
+	return USBTransportTypeMetadata[a].Name
+}
+
+// LayerType returns USBTransportTypeMetadata.LayerType.
+func (a USBTransportType) LayerType() gopacket.LayerType {
+	return USBTransportTypeMetadata[a].LayerType
+}
+
+type errorDecoderForUSBTransportType int
+
+func (a *errorDecoderForUSBTransportType) Decode(data []byte, p gopacket.PacketBuilder) error {
+	return a
+}
+func (a *errorDecoderForUSBTransportType) Error() string {
+	return fmt.Sprintf("Unable to decode USBTransportType %d", int(*a))
+}
+
+var errorDecodersForUSBTransportType [256]errorDecoderForUSBTransportType
+var USBTransportTypeMetadata [256]EnumMetadata
+
+func initUnknownTypesForUSBTransportType() {
+	for i := 0; i < 256; i++ {
+		errorDecodersForUSBTransportType[i] = errorDecoderForUSBTransportType(i)
+		USBTransportTypeMetadata[i] = EnumMetadata{
+			DecodeWith: &errorDecodersForUSBTransportType[i],
+			Name:       "UnknownUSBTransportType",
+		}
+	}
+}

vendor/github.com/google/gopacket/layers/erspan2.go

@@ -0,0 +1,86 @@
+// Copyright 2018 Google, Inc. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+package layers
+
+import (
+	"encoding/binary"
+
+	"github.com/google/gopacket"
+)
+
+const (
+	//ERSPANIIVersionObsolete - The obsolete value for the version field
+	ERSPANIIVersionObsolete = 0x0
+	// ERSPANIIVersion - The current value for the version field
+	ERSPANIIVersion = 0x1
+)
+
+// ERSPANII contains all of the fields found in an ERSPAN Type II header
+// https://tools.ietf.org/html/draft-foschiano-erspan-03
+type ERSPANII struct {
+	BaseLayer
+	IsTruncated                         bool
+	Version, CoS, TrunkEncap            uint8
+	VLANIdentifier, SessionID, Reserved uint16
+	Index                               uint32
+}
+
+func (erspan2 *ERSPANII) LayerType() gopacket.LayerType { return LayerTypeERSPANII }
+
+// DecodeFromBytes decodes the given bytes into this layer.
+func (erspan2 *ERSPANII) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+	erspan2Length := 8
+	erspan2.Version = data[0] & 0xF0 >> 4
+	erspan2.VLANIdentifier = binary.BigEndian.Uint16(data[:2]) & 0x0FFF
+	erspan2.CoS = data[2] & 0xE0 >> 5
+	erspan2.TrunkEncap = data[2] & 0x18 >> 3
+	erspan2.IsTruncated = data[2]&0x4>>2 != 0
+	erspan2.SessionID = binary.BigEndian.Uint16(data[2:4]) & 0x03FF
+	erspan2.Reserved = binary.BigEndian.Uint16(data[4:6]) & 0xFFF0 >> 4
+	erspan2.Index = binary.BigEndian.Uint32(data[4:8]) & 0x000FFFFF
+	erspan2.Contents = data[:erspan2Length]
+	erspan2.Payload = data[erspan2Length:]
+	return nil
+}
+
+// SerializeTo writes the serialized form of this layer into the
+// SerializationBuffer, implementing gopacket.SerializableLayer.
+// See the docs for gopacket.SerializableLayer for more info.
+func (erspan2 *ERSPANII) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	bytes, err := b.PrependBytes(8)
+	if err != nil {
+		return err
+	}
+
+	twoByteInt := uint16(erspan2.Version&0xF)<<12 | erspan2.VLANIdentifier&0x0FFF
+	binary.BigEndian.PutUint16(bytes, twoByteInt)
+
+	twoByteInt = uint16(erspan2.CoS&0x7)<<13 | uint16(erspan2.TrunkEncap&0x3)<<11 | erspan2.SessionID&0x03FF
+	if erspan2.IsTruncated {
+		twoByteInt |= 0x400
+	}
+	binary.BigEndian.PutUint16(bytes[2:], twoByteInt)
+
+	fourByteInt := uint32(erspan2.Reserved&0x0FFF)<<20 | erspan2.Index&0x000FFFFF
+	binary.BigEndian.PutUint32(bytes[4:], fourByteInt)
+	return nil
+}
+
+// CanDecode returns the set of layer types that this DecodingLayer can decode.
+func (erspan2 *ERSPANII) CanDecode() gopacket.LayerClass {
+	return LayerTypeERSPANII
+}
+
+// NextLayerType returns the layer type contained by this DecodingLayer.
+func (erspan2 *ERSPANII) NextLayerType() gopacket.LayerType {
+	return LayerTypeEthernet
+}
+
+func decodeERSPANII(data []byte, p gopacket.PacketBuilder) error {
+	erspan2 := &ERSPANII{}
+	return decodingLayerDecoder(erspan2, data, p)
+}

vendor/github.com/google/gopacket/layers/etherip.go

@@ -0,0 +1,45 @@
+// Copyright 2012 Google, Inc. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+package layers
+
+import (
+	"encoding/binary"
+	"github.com/google/gopacket"
+)
+
+// EtherIP is the struct for storing RFC 3378 EtherIP packet headers.
+type EtherIP struct {
+	BaseLayer
+	Version  uint8
+	Reserved uint16
+}
+
+// LayerType returns gopacket.LayerTypeEtherIP.
+func (e *EtherIP) LayerType() gopacket.LayerType { return LayerTypeEtherIP }
+
+// DecodeFromBytes decodes the given bytes into this layer.
+func (e *EtherIP) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+	e.Version = data[0] >> 4
+	e.Reserved = binary.BigEndian.Uint16(data[:2]) & 0x0fff
+	e.BaseLayer = BaseLayer{data[:2], data[2:]}
+	return nil
+}
+
+// CanDecode returns the set of layer types that this DecodingLayer can decode.
+func (e *EtherIP) CanDecode() gopacket.LayerClass {
+	return LayerTypeEtherIP
+}
+
+// NextLayerType returns the layer type contained by this DecodingLayer.
+func (e *EtherIP) NextLayerType() gopacket.LayerType {
+	return LayerTypeEthernet
+}
+
+func decodeEtherIP(data []byte, p gopacket.PacketBuilder) error {
+	e := &EtherIP{}
+	return decodingLayerDecoder(e, data, p)
+}

vendor/github.com/google/gopacket/layers/ethernet.go

@@ -0,0 +1,123 @@
+// Copyright 2012 Google, Inc. All rights reserved.
+// Copyright 2009-2011 Andreas Krennmair. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+package layers
+
+import (
+	"encoding/binary"
+	"errors"
+	"fmt"
+	"github.com/google/gopacket"
+	"net"
+)
+
+// EthernetBroadcast is the broadcast MAC address used by Ethernet.
+var EthernetBroadcast = net.HardwareAddr{0xff, 0xff, 0xff, 0xff, 0xff, 0xff}
+
+// Ethernet is the layer for Ethernet frame headers.
+type Ethernet struct {
+	BaseLayer
+	SrcMAC, DstMAC net.HardwareAddr
+	EthernetType   EthernetType
+	// Length is only set if a length field exists within this header.  Ethernet
+	// headers follow two different standards, one that uses an EthernetType, the
+	// other which defines a length the follows with a LLC header (802.3).  If the
+	// former is the case, we set EthernetType and Length stays 0.  In the latter
+	// case, we set Length and EthernetType = EthernetTypeLLC.
+	Length uint16
+}
+
+// LayerType returns LayerTypeEthernet
+func (e *Ethernet) LayerType() gopacket.LayerType { return LayerTypeEthernet }
+
+func (e *Ethernet) LinkFlow() gopacket.Flow {
+	return gopacket.NewFlow(EndpointMAC, e.SrcMAC, e.DstMAC)
+}
+
+func (eth *Ethernet) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+	if len(data) < 14 {
+		return errors.New("Ethernet packet too small")
+	}
+	eth.DstMAC = net.HardwareAddr(data[0:6])
+	eth.SrcMAC = net.HardwareAddr(data[6:12])
+	eth.EthernetType = EthernetType(binary.BigEndian.Uint16(data[12:14]))
+	eth.BaseLayer = BaseLayer{data[:14], data[14:]}
+	eth.Length = 0
+	if eth.EthernetType < 0x0600 {
+		eth.Length = uint16(eth.EthernetType)
+		eth.EthernetType = EthernetTypeLLC
+		if cmp := len(eth.Payload) - int(eth.Length); cmp < 0 {
+			df.SetTruncated()
+		} else if cmp > 0 {
+			// Strip off bytes at the end, since we have too many bytes
+			eth.Payload = eth.Payload[:len(eth.Payload)-cmp]
+		}
+		//	fmt.Println(eth)
+	}
+	return nil
+}
+
+// SerializeTo writes the serialized form of this layer into the
+// SerializationBuffer, implementing gopacket.SerializableLayer.
+// See the docs for gopacket.SerializableLayer for more info.
+func (eth *Ethernet) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	if len(eth.DstMAC) != 6 {
+		return fmt.Errorf("invalid dst MAC: %v", eth.DstMAC)
+	}
+	if len(eth.SrcMAC) != 6 {
+		return fmt.Errorf("invalid src MAC: %v", eth.SrcMAC)
+	}
+	payload := b.Bytes()
+	bytes, err := b.PrependBytes(14)
+	if err != nil {
+		return err
+	}
+	copy(bytes, eth.DstMAC)
+	copy(bytes[6:], eth.SrcMAC)
+	if eth.Length != 0 || eth.EthernetType == EthernetTypeLLC {
+		if opts.FixLengths {
+			eth.Length = uint16(len(payload))
+		}
+		if eth.EthernetType != EthernetTypeLLC {
+			return fmt.Errorf("ethernet type %v not compatible with length value %v", eth.EthernetType, eth.Length)
+		} else if eth.Length > 0x0600 {
+			return fmt.Errorf("invalid ethernet length %v", eth.Length)
+		}
+		binary.BigEndian.PutUint16(bytes[12:], eth.Length)
+	} else {
+		binary.BigEndian.PutUint16(bytes[12:], uint16(eth.EthernetType))
+	}
+	length := len(b.Bytes())
+	if length < 60 {
+		// Pad out to 60 bytes.
+		padding, err := b.AppendBytes(60 - length)
+		if err != nil {
+			return err
+		}
+		copy(padding, lotsOfZeros[:])
+	}
+	return nil
+}
+
+func (eth *Ethernet) CanDecode() gopacket.LayerClass {
+	return LayerTypeEthernet
+}
+
+func (eth *Ethernet) NextLayerType() gopacket.LayerType {
+	return eth.EthernetType.LayerType()
+}
+
+func decodeEthernet(data []byte, p gopacket.PacketBuilder) error {
+	eth := &Ethernet{}
+	err := eth.DecodeFromBytes(data, p)
+	if err != nil {
+		return err
+	}
+	p.AddLayer(eth)
+	p.SetLinkLayer(eth)
+	return p.NextDecoder(eth.EthernetType)
+}

vendor/github.com/google/gopacket/layers/fddi.go

@@ -0,0 +1,41 @@
+// Copyright 2012 Google, Inc. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+package layers
+
+import (
+	"github.com/google/gopacket"
+	"net"
+)
+
+// FDDI contains the header for FDDI frames.
+type FDDI struct {
+	BaseLayer
+	FrameControl   FDDIFrameControl
+	Priority       uint8
+	SrcMAC, DstMAC net.HardwareAddr
+}
+
+// LayerType returns LayerTypeFDDI.
+func (f *FDDI) LayerType() gopacket.LayerType { return LayerTypeFDDI }
+
+// LinkFlow returns a new flow of type EndpointMAC.
+func (f *FDDI) LinkFlow() gopacket.Flow {
+	return gopacket.NewFlow(EndpointMAC, f.SrcMAC, f.DstMAC)
+}
+
+func decodeFDDI(data []byte, p gopacket.PacketBuilder) error {
+	f := &FDDI{
+		FrameControl: FDDIFrameControl(data[0] & 0xF8),
+		Priority:     data[0] & 0x07,
+		SrcMAC:       net.HardwareAddr(data[1:7]),
+		DstMAC:       net.HardwareAddr(data[7:13]),
+		BaseLayer:    BaseLayer{data[:13], data[13:]},
+	}
+	p.SetLinkLayer(f)
+	p.AddLayer(f)
+	return p.NextDecoder(f.FrameControl)
+}

vendor/github.com/google/gopacket/layers/fuzz_layer.go

@@ -0,0 +1,39 @@
+// Copyright 2019 The GoPacket Authors. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license that can be found
+// in the LICENSE file in the root of the source tree.
+
+package layers
+
+import (
+	"encoding/binary"
+
+	"github.com/google/gopacket"
+)
+
+// FuzzLayer is a fuzz target for the layers package of gopacket
+// A fuzz target is a function processing a binary blob (byte slice)
+// The process here is to interpret this data as a packet, and print the layers contents.
+// The decoding options and the starting layer are encoded in the first bytes.
+// The function returns 1 if this is a valid packet (no error layer)
+func FuzzLayer(data []byte) int {
+	if len(data) < 3 {
+		return 0
+	}
+	// use the first two bytes to choose the top level layer
+	startLayer := binary.BigEndian.Uint16(data[:2])
+	var fuzzOpts = gopacket.DecodeOptions{
+		Lazy:                     data[2]&0x1 != 0,
+		NoCopy:                   data[2]&0x2 != 0,
+		SkipDecodeRecovery:       data[2]&0x4 != 0,
+		DecodeStreamsAsDatagrams: data[2]&0x8 != 0,
+	}
+	p := gopacket.NewPacket(data[3:], gopacket.LayerType(startLayer), fuzzOpts)
+	for _, l := range p.Layers() {
+		gopacket.LayerString(l)
+	}
+	if p.ErrorLayer() != nil {
+		return 0
+	}
+	return 1
+}

vendor/github.com/google/gopacket/layers/gen_linted.sh

@@ -0,0 +1,3 @@
+#!/bin/bash
+
+for i in *.go; do golint $i | grep -q . || echo $i; done > .linted

vendor/github.com/google/gopacket/layers/geneve.go

@@ -0,0 +1,121 @@
+// Copyright 2016 Google, Inc. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+package layers
+
+import (
+	"encoding/binary"
+	"errors"
+
+	"github.com/google/gopacket"
+)
+
+// Geneve is specifed here https://tools.ietf.org/html/draft-ietf-nvo3-geneve-03
+// Geneve Header:
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+// |Ver|  Opt Len  |O|C|    Rsvd.  |          Protocol Type        |
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+// |        Virtual Network Identifier (VNI)       |    Reserved   |
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+// |                    Variable Length Options                    |
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+type Geneve struct {
+	BaseLayer
+	Version        uint8        // 2 bits
+	OptionsLength  uint8        // 6 bits
+	OAMPacket      bool         // 1 bits
+	CriticalOption bool         // 1 bits
+	Protocol       EthernetType // 16 bits
+	VNI            uint32       // 24bits
+	Options        []*GeneveOption
+}
+
+// Geneve Tunnel Options
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+// |          Option Class         |      Type     |R|R|R| Length  |
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+// |                      Variable Option Data                     |
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+type GeneveOption struct {
+	Class  uint16 // 16 bits
+	Type   uint8  // 8 bits
+	Flags  uint8  // 3 bits
+	Length uint8  // 5 bits
+	Data   []byte
+}
+
+// LayerType returns LayerTypeGeneve
+func (gn *Geneve) LayerType() gopacket.LayerType { return LayerTypeGeneve }
+
+func decodeGeneveOption(data []byte, gn *Geneve, df gopacket.DecodeFeedback) (*GeneveOption, uint8, error) {
+	if len(data) < 3 {
+		df.SetTruncated()
+		return nil, 0, errors.New("geneve option too small")
+	}
+	opt := &GeneveOption{}
+
+	opt.Class = binary.BigEndian.Uint16(data[0:2])
+	opt.Type = data[2]
+	opt.Flags = data[3] >> 4
+	opt.Length = (data[3]&0xf)*4 + 4
+
+	if len(data) < int(opt.Length) {
+		df.SetTruncated()
+		return nil, 0, errors.New("geneve option too small")
+	}
+	opt.Data = make([]byte, opt.Length-4)
+	copy(opt.Data, data[4:opt.Length])
+
+	return opt, opt.Length, nil
+}
+
+func (gn *Geneve) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+	if len(data) < 7 {
+		df.SetTruncated()
+		return errors.New("geneve packet too short")
+	}
+
+	gn.Version = data[0] >> 7
+	gn.OptionsLength = (data[0] & 0x3f) * 4
+
+	gn.OAMPacket = data[1]&0x80 > 0
+	gn.CriticalOption = data[1]&0x40 > 0
+	gn.Protocol = EthernetType(binary.BigEndian.Uint16(data[2:4]))
+
+	var buf [4]byte
+	copy(buf[1:], data[4:7])
+	gn.VNI = binary.BigEndian.Uint32(buf[:])
+
+	offset, length := uint8(8), int32(gn.OptionsLength)
+	if len(data) < int(length+7) {
+		df.SetTruncated()
+		return errors.New("geneve packet too short")
+	}
+
+	for length > 0 {
+		opt, len, err := decodeGeneveOption(data[offset:], gn, df)
+		if err != nil {
+			return err
+		}
+		gn.Options = append(gn.Options, opt)
+
+		length -= int32(len)
+		offset += len
+	}
+
+	gn.BaseLayer = BaseLayer{data[:offset], data[offset:]}
+
+	return nil
+}
+
+func (gn *Geneve) NextLayerType() gopacket.LayerType {
+	return gn.Protocol.LayerType()
+}
+
+func decodeGeneve(data []byte, p gopacket.PacketBuilder) error {
+	gn := &Geneve{}
+	return decodingLayerDecoder(gn, data, p)
+}

vendor/github.com/google/gopacket/layers/gre.go

@@ -0,0 +1,200 @@
+// Copyright 2012 Google, Inc. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+package layers
+
+import (
+	"encoding/binary"
+
+	"github.com/google/gopacket"
+)
+
+// GRE is a Generic Routing Encapsulation header.
+type GRE struct {
+	BaseLayer
+	ChecksumPresent, RoutingPresent, KeyPresent, SeqPresent, StrictSourceRoute, AckPresent bool
+	RecursionControl, Flags, Version                                                       uint8
+	Protocol                                                                               EthernetType
+	Checksum, Offset                                                                       uint16
+	Key, Seq, Ack                                                                          uint32
+	*GRERouting
+}
+
+// GRERouting is GRE routing information, present if the RoutingPresent flag is
+// set.
+type GRERouting struct {
+	AddressFamily        uint16
+	SREOffset, SRELength uint8
+	RoutingInformation   []byte
+	Next                 *GRERouting
+}
+
+// LayerType returns gopacket.LayerTypeGRE.
+func (g *GRE) LayerType() gopacket.LayerType { return LayerTypeGRE }
+
+// DecodeFromBytes decodes the given bytes into this layer.
+func (g *GRE) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+	g.ChecksumPresent = data[0]&0x80 != 0
+	g.RoutingPresent = data[0]&0x40 != 0
+	g.KeyPresent = data[0]&0x20 != 0
+	g.SeqPresent = data[0]&0x10 != 0
+	g.StrictSourceRoute = data[0]&0x08 != 0
+	g.AckPresent = data[1]&0x80 != 0
+	g.RecursionControl = data[0] & 0x7
+	g.Flags = data[1] >> 3
+	g.Version = data[1] & 0x7
+	g.Protocol = EthernetType(binary.BigEndian.Uint16(data[2:4]))
+	offset := 4
+	if g.ChecksumPresent || g.RoutingPresent {
+		g.Checksum = binary.BigEndian.Uint16(data[offset : offset+2])
+		g.Offset = binary.BigEndian.Uint16(data[offset+2 : offset+4])
+		offset += 4
+	}
+	if g.KeyPresent {
+		g.Key = binary.BigEndian.Uint32(data[offset : offset+4])
+		offset += 4
+	}
+	if g.SeqPresent {
+		g.Seq = binary.BigEndian.Uint32(data[offset : offset+4])
+		offset += 4
+	}
+	if g.RoutingPresent {
+		tail := &g.GRERouting
+		for {
+			sre := &GRERouting{
+				AddressFamily: binary.BigEndian.Uint16(data[offset : offset+2]),
+				SREOffset:     data[offset+2],
+				SRELength:     data[offset+3],
+			}
+			sre.RoutingInformation = data[offset+4 : offset+4+int(sre.SRELength)]
+			offset += 4 + int(sre.SRELength)
+			if sre.AddressFamily == 0 && sre.SRELength == 0 {
+				break
+			}
+			(*tail) = sre
+			tail = &sre.Next
+		}
+	}
+	if g.AckPresent {
+		g.Ack = binary.BigEndian.Uint32(data[offset : offset+4])
+		offset += 4
+	}
+	g.BaseLayer = BaseLayer{data[:offset], data[offset:]}
+	return nil
+}
+
+// SerializeTo writes the serialized form of this layer into the SerializationBuffer,
+// implementing gopacket.SerializableLayer. See the docs for gopacket.SerializableLayer for more info.
+func (g *GRE) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	size := 4
+	if g.ChecksumPresent || g.RoutingPresent {
+		size += 4
+	}
+	if g.KeyPresent {
+		size += 4
+	}
+	if g.SeqPresent {
+		size += 4
+	}
+	if g.RoutingPresent {
+		r := g.GRERouting
+		for r != nil {
+			size += 4 + int(r.SRELength)
+			r = r.Next
+		}
+		size += 4
+	}
+	if g.AckPresent {
+		size += 4
+	}
+	buf, err := b.PrependBytes(size)
+	if err != nil {
+		return err
+	}
+	// Reset any potentially dirty memory in the first 2 bytes, as these use OR to set flags.
+	buf[0] = 0
+	buf[1] = 0
+	if g.ChecksumPresent {
+		buf[0] |= 0x80
+	}
+	if g.RoutingPresent {
+		buf[0] |= 0x40
+	}
+	if g.KeyPresent {
+		buf[0] |= 0x20
+	}
+	if g.SeqPresent {
+		buf[0] |= 0x10
+	}
+	if g.StrictSourceRoute {
+		buf[0] |= 0x08
+	}
+	if g.AckPresent {
+		buf[1] |= 0x80
+	}
+	buf[0] |= g.RecursionControl
+	buf[1] |= g.Flags << 3
+	buf[1] |= g.Version
+	binary.BigEndian.PutUint16(buf[2:4], uint16(g.Protocol))
+	offset := 4
+	if g.ChecksumPresent || g.RoutingPresent {
+		// Don't write the checksum value yet, as we may need to compute it,
+		// which requires the entire header be complete.
+		// Instead we zeroize the memory in case it is dirty.
+		buf[offset] = 0
+		buf[offset+1] = 0
+		binary.BigEndian.PutUint16(buf[offset+2:offset+4], g.Offset)
+		offset += 4
+	}
+	if g.KeyPresent {
+		binary.BigEndian.PutUint32(buf[offset:offset+4], g.Key)
+		offset += 4
+	}
+	if g.SeqPresent {
+		binary.BigEndian.PutUint32(buf[offset:offset+4], g.Seq)
+		offset += 4
+	}
+	if g.RoutingPresent {
+		sre := g.GRERouting
+		for sre != nil {
+			binary.BigEndian.PutUint16(buf[offset:offset+2], sre.AddressFamily)
+			buf[offset+2] = sre.SREOffset
+			buf[offset+3] = sre.SRELength
+			copy(buf[offset+4:offset+4+int(sre.SRELength)], sre.RoutingInformation)
+			offset += 4 + int(sre.SRELength)
+			sre = sre.Next
+		}
+		// Terminate routing field with a "NULL" SRE.
+		binary.BigEndian.PutUint32(buf[offset:offset+4], 0)
+	}
+	if g.AckPresent {
+		binary.BigEndian.PutUint32(buf[offset:offset+4], g.Ack)
+		offset += 4
+	}
+	if g.ChecksumPresent {
+		if opts.ComputeChecksums {
+			g.Checksum = tcpipChecksum(b.Bytes(), 0)
+		}
+
+		binary.BigEndian.PutUint16(buf[4:6], g.Checksum)
+	}
+	return nil
+}
+
+// CanDecode returns the set of layer types that this DecodingLayer can decode.
+func (g *GRE) CanDecode() gopacket.LayerClass {
+	return LayerTypeGRE
+}
+
+// NextLayerType returns the layer type contained by this DecodingLayer.
+func (g *GRE) NextLayerType() gopacket.LayerType {
+	return g.Protocol.LayerType()
+}
+
+func decodeGRE(data []byte, p gopacket.PacketBuilder) error {
+	g := &GRE{}
+	return decodingLayerDecoder(g, data, p)
+}

vendor/github.com/google/gopacket/layers/gtp.go

@@ -0,0 +1,184 @@
+// Copyright 2017 Google, Inc. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+//
+
+package layers
+
+import (
+	"encoding/binary"
+	"fmt"
+	"github.com/google/gopacket"
+)
+
+const gtpMinimumSizeInBytes int = 8
+
+// GTPExtensionHeader is used to carry extra data and enable future extensions of the GTP  without the need to use another version number.
+type GTPExtensionHeader struct {
+	Type    uint8
+	Content []byte
+}
+
+// GTPv1U protocol is used to exchange user data over GTP tunnels across the Sx interfaces.
+// Defined in https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=1595
+type GTPv1U struct {
+	BaseLayer
+	Version             uint8
+	ProtocolType        uint8
+	Reserved            uint8
+	ExtensionHeaderFlag bool
+	SequenceNumberFlag  bool
+	NPDUFlag            bool
+	MessageType         uint8
+	MessageLength       uint16
+	TEID                uint32
+	SequenceNumber      uint16
+	NPDU                uint8
+	GTPExtensionHeaders []GTPExtensionHeader
+}
+
+// LayerType returns LayerTypeGTPV1U
+func (g *GTPv1U) LayerType() gopacket.LayerType { return LayerTypeGTPv1U }
+
+// DecodeFromBytes analyses a byte slice and attempts to decode it as a GTPv1U packet
+func (g *GTPv1U) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+	hLen := gtpMinimumSizeInBytes
+	dLen := len(data)
+	if dLen < hLen {
+		return fmt.Errorf("GTP packet too small: %d bytes", dLen)
+	}
+	g.Version = (data[0] >> 5) & 0x07
+	g.ProtocolType = (data[0] >> 4) & 0x01
+	g.Reserved = (data[0] >> 3) & 0x01
+	g.SequenceNumberFlag = ((data[0] >> 1) & 0x01) == 1
+	g.NPDUFlag = (data[0] & 0x01) == 1
+	g.ExtensionHeaderFlag = ((data[0] >> 2) & 0x01) == 1
+	g.MessageType = data[1]
+	g.MessageLength = binary.BigEndian.Uint16(data[2:4])
+	pLen := 8 + g.MessageLength
+	if uint16(dLen) < pLen {
+		return fmt.Errorf("GTP packet too small: %d bytes", dLen)
+	}
+	//  Field used to multiplex different connections in the same GTP tunnel.
+	g.TEID = binary.BigEndian.Uint32(data[4:8])
+	cIndex := uint16(hLen)
+	if g.SequenceNumberFlag || g.NPDUFlag || g.ExtensionHeaderFlag {
+		hLen += 4
+		cIndex += 4
+		if dLen < hLen {
+			return fmt.Errorf("GTP packet too small: %d bytes", dLen)
+		}
+		if g.SequenceNumberFlag {
+			g.SequenceNumber = binary.BigEndian.Uint16(data[8:10])
+		}
+		if g.NPDUFlag {
+			g.NPDU = data[10]
+		}
+		if g.ExtensionHeaderFlag {
+			extensionFlag := true
+			for extensionFlag {
+				extensionType := uint8(data[cIndex-1])
+				extensionLength := uint(data[cIndex])
+				if extensionLength == 0 {
+					return fmt.Errorf("GTP packet with invalid extension header")
+				}
+				// extensionLength is in 4-octet units
+				lIndex := cIndex + (uint16(extensionLength) * 4)
+				if uint16(dLen) < lIndex {
+					fmt.Println(dLen, lIndex)
+					return fmt.Errorf("GTP packet with small extension header: %d bytes", dLen)
+				}
+				content := data[cIndex+1 : lIndex-1]
+				eh := GTPExtensionHeader{Type: extensionType, Content: content}
+				g.GTPExtensionHeaders = append(g.GTPExtensionHeaders, eh)
+				cIndex = lIndex
+				// Check if coming bytes are from an extension header
+				extensionFlag = data[cIndex-1] != 0
+
+			}
+		}
+	}
+	g.BaseLayer = BaseLayer{Contents: data[:cIndex], Payload: data[cIndex:]}
+	return nil
+
+}
+
+// SerializeTo writes the serialized form of this layer into the
+// SerializationBuffer, implementing gopacket.SerializableLayer.
+// See the docs for gopacket.SerializableLayer for more info.
+func (g *GTPv1U) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	data, err := b.PrependBytes(gtpMinimumSizeInBytes)
+	if err != nil {
+		return err
+	}
+	data[0] |= (g.Version << 5)
+	data[0] |= (1 << 4)
+	if len(g.GTPExtensionHeaders) > 0 {
+		data[0] |= 0x04
+		g.ExtensionHeaderFlag = true
+	}
+	if g.SequenceNumberFlag {
+		data[0] |= 0x02
+	}
+	if g.NPDUFlag {
+		data[0] |= 0x01
+	}
+	data[1] = g.MessageType
+	binary.BigEndian.PutUint16(data[2:4], g.MessageLength)
+	binary.BigEndian.PutUint32(data[4:8], g.TEID)
+	if g.ExtensionHeaderFlag || g.SequenceNumberFlag || g.NPDUFlag {
+		data, err := b.AppendBytes(4)
+		if err != nil {
+			return err
+		}
+		binary.BigEndian.PutUint16(data[:2], g.SequenceNumber)
+		data[2] = g.NPDU
+		for _, eh := range g.GTPExtensionHeaders {
+			data[len(data)-1] = eh.Type
+			lContent := len(eh.Content)
+			// extensionLength is in 4-octet units
+			extensionLength := (lContent + 2) / 4
+			// Get two extra byte for the next extension header type and length
+			data, err = b.AppendBytes(lContent + 2)
+			if err != nil {
+				return err
+			}
+			data[0] = byte(extensionLength)
+			copy(data[1:lContent+1], eh.Content)
+		}
+	}
+	return nil
+
+}
+
+// CanDecode returns a set of layers that GTP objects can decode.
+func (g *GTPv1U) CanDecode() gopacket.LayerClass {
+	return LayerTypeGTPv1U
+}
+
+// NextLayerType specifies the next layer that GoPacket should attempt to
+func (g *GTPv1U) NextLayerType() gopacket.LayerType {
+	if len(g.LayerPayload()) == 0 {
+		return gopacket.LayerTypeZero
+	}
+	version := uint8(g.LayerPayload()[0]) >> 4
+	if version == 4 {
+		return LayerTypeIPv4
+	} else if version == 6 {
+		return LayerTypeIPv6
+	} else {
+		return LayerTypePPP
+	}
+}
+
+func decodeGTPv1u(data []byte, p gopacket.PacketBuilder) error {
+	gtp := &GTPv1U{}
+	err := gtp.DecodeFromBytes(data, p)
+	if err != nil {
+		return err
+	}
+	p.AddLayer(gtp)
+	return p.NextDecoder(gtp.NextLayerType())
+}

vendor/github.com/google/gopacket/layers/icmp4.go

@@ -0,0 +1,267 @@
+// Copyright 2012 Google, Inc. All rights reserved.
+// Copyright 2009-2011 Andreas Krennmair. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+package layers
+
+import (
+	"encoding/binary"
+	"errors"
+	"fmt"
+	"reflect"
+
+	"github.com/google/gopacket"
+)
+
+const (
+	ICMPv4TypeEchoReply              = 0
+	ICMPv4TypeDestinationUnreachable = 3
+	ICMPv4TypeSourceQuench           = 4
+	ICMPv4TypeRedirect               = 5
+	ICMPv4TypeEchoRequest            = 8
+	ICMPv4TypeRouterAdvertisement    = 9
+	ICMPv4TypeRouterSolicitation     = 10
+	ICMPv4TypeTimeExceeded           = 11
+	ICMPv4TypeParameterProblem       = 12
+	ICMPv4TypeTimestampRequest       = 13
+	ICMPv4TypeTimestampReply         = 14
+	ICMPv4TypeInfoRequest            = 15
+	ICMPv4TypeInfoReply              = 16
+	ICMPv4TypeAddressMaskRequest     = 17
+	ICMPv4TypeAddressMaskReply       = 18
+)
+
+const (
+	// DestinationUnreachable
+	ICMPv4CodeNet                 = 0
+	ICMPv4CodeHost                = 1
+	ICMPv4CodeProtocol            = 2
+	ICMPv4CodePort                = 3
+	ICMPv4CodeFragmentationNeeded = 4
+	ICMPv4CodeSourceRoutingFailed = 5
+	ICMPv4CodeNetUnknown          = 6
+	ICMPv4CodeHostUnknown         = 7
+	ICMPv4CodeSourceIsolated      = 8
+	ICMPv4CodeNetAdminProhibited  = 9
+	ICMPv4CodeHostAdminProhibited = 10
+	ICMPv4CodeNetTOS              = 11
+	ICMPv4CodeHostTOS             = 12
+	ICMPv4CodeCommAdminProhibited = 13
+	ICMPv4CodeHostPrecedence      = 14
+	ICMPv4CodePrecedenceCutoff    = 15
+
+	// TimeExceeded
+	ICMPv4CodeTTLExceeded                    = 0
+	ICMPv4CodeFragmentReassemblyTimeExceeded = 1
+
+	// ParameterProblem
+	ICMPv4CodePointerIndicatesError = 0
+	ICMPv4CodeMissingOption         = 1
+	ICMPv4CodeBadLength             = 2
+
+	// Redirect
+	// ICMPv4CodeNet  = same as for DestinationUnreachable
+	// ICMPv4CodeHost = same as for DestinationUnreachable
+	ICMPv4CodeTOSNet  = 2
+	ICMPv4CodeTOSHost = 3
+)
+
+type icmpv4TypeCodeInfoStruct struct {
+	typeStr string
+	codeStr *map[uint8]string
+}
+
+var (
+	icmpv4TypeCodeInfo = map[uint8]icmpv4TypeCodeInfoStruct{
+		ICMPv4TypeDestinationUnreachable: icmpv4TypeCodeInfoStruct{
+			"DestinationUnreachable", &map[uint8]string{
+				ICMPv4CodeNet:                 "Net",
+				ICMPv4CodeHost:                "Host",
+				ICMPv4CodeProtocol:            "Protocol",
+				ICMPv4CodePort:                "Port",
+				ICMPv4CodeFragmentationNeeded: "FragmentationNeeded",
+				ICMPv4CodeSourceRoutingFailed: "SourceRoutingFailed",
+				ICMPv4CodeNetUnknown:          "NetUnknown",
+				ICMPv4CodeHostUnknown:         "HostUnknown",
+				ICMPv4CodeSourceIsolated:      "SourceIsolated",
+				ICMPv4CodeNetAdminProhibited:  "NetAdminProhibited",
+				ICMPv4CodeHostAdminProhibited: "HostAdminProhibited",
+				ICMPv4CodeNetTOS:              "NetTOS",
+				ICMPv4CodeHostTOS:             "HostTOS",
+				ICMPv4CodeCommAdminProhibited: "CommAdminProhibited",
+				ICMPv4CodeHostPrecedence:      "HostPrecedence",
+				ICMPv4CodePrecedenceCutoff:    "PrecedenceCutoff",
+			},
+		},
+		ICMPv4TypeTimeExceeded: icmpv4TypeCodeInfoStruct{
+			"TimeExceeded", &map[uint8]string{
+				ICMPv4CodeTTLExceeded:                    "TTLExceeded",
+				ICMPv4CodeFragmentReassemblyTimeExceeded: "FragmentReassemblyTimeExceeded",
+			},
+		},
+		ICMPv4TypeParameterProblem: icmpv4TypeCodeInfoStruct{
+			"ParameterProblem", &map[uint8]string{
+				ICMPv4CodePointerIndicatesError: "PointerIndicatesError",
+				ICMPv4CodeMissingOption:         "MissingOption",
+				ICMPv4CodeBadLength:             "BadLength",
+			},
+		},
+		ICMPv4TypeSourceQuench: icmpv4TypeCodeInfoStruct{
+			"SourceQuench", nil,
+		},
+		ICMPv4TypeRedirect: icmpv4TypeCodeInfoStruct{
+			"Redirect", &map[uint8]string{
+				ICMPv4CodeNet:     "Net",
+				ICMPv4CodeHost:    "Host",
+				ICMPv4CodeTOSNet:  "TOS+Net",
+				ICMPv4CodeTOSHost: "TOS+Host",
+			},
+		},
+		ICMPv4TypeEchoRequest: icmpv4TypeCodeInfoStruct{
+			"EchoRequest", nil,
+		},
+		ICMPv4TypeEchoReply: icmpv4TypeCodeInfoStruct{
+			"EchoReply", nil,
+		},
+		ICMPv4TypeTimestampRequest: icmpv4TypeCodeInfoStruct{
+			"TimestampRequest", nil,
+		},
+		ICMPv4TypeTimestampReply: icmpv4TypeCodeInfoStruct{
+			"TimestampReply", nil,
+		},
+		ICMPv4TypeInfoRequest: icmpv4TypeCodeInfoStruct{
+			"InfoRequest", nil,
+		},
+		ICMPv4TypeInfoReply: icmpv4TypeCodeInfoStruct{
+			"InfoReply", nil,
+		},
+		ICMPv4TypeRouterSolicitation: icmpv4TypeCodeInfoStruct{
+			"RouterSolicitation", nil,
+		},
+		ICMPv4TypeRouterAdvertisement: icmpv4TypeCodeInfoStruct{
+			"RouterAdvertisement", nil,
+		},
+		ICMPv4TypeAddressMaskRequest: icmpv4TypeCodeInfoStruct{
+			"AddressMaskRequest", nil,
+		},
+		ICMPv4TypeAddressMaskReply: icmpv4TypeCodeInfoStruct{
+			"AddressMaskReply", nil,
+		},
+	}
+)
+
+type ICMPv4TypeCode uint16
+
+// Type returns the ICMPv4 type field.
+func (a ICMPv4TypeCode) Type() uint8 {
+	return uint8(a >> 8)
+}
+
+// Code returns the ICMPv4 code field.
+func (a ICMPv4TypeCode) Code() uint8 {
+	return uint8(a)
+}
+
+func (a ICMPv4TypeCode) String() string {
+	t, c := a.Type(), a.Code()
+	strInfo, ok := icmpv4TypeCodeInfo[t]
+	if !ok {
+		// Unknown ICMPv4 type field
+		return fmt.Sprintf("%d(%d)", t, c)
+	}
+	typeStr := strInfo.typeStr
+	if strInfo.codeStr == nil && c == 0 {
+		// The ICMPv4 type does not make use of the code field
+		return fmt.Sprintf("%s", strInfo.typeStr)
+	}
+	if strInfo.codeStr == nil && c != 0 {
+		// The ICMPv4 type does not make use of the code field, but it is present anyway
+		return fmt.Sprintf("%s(Code: %d)", typeStr, c)
+	}
+	codeStr, ok := (*strInfo.codeStr)[c]
+	if !ok {
+		// We don't know this ICMPv4 code; print the numerical value
+		return fmt.Sprintf("%s(Code: %d)", typeStr, c)
+	}
+	return fmt.Sprintf("%s(%s)", typeStr, codeStr)
+}
+
+func (a ICMPv4TypeCode) GoString() string {
+	t := reflect.TypeOf(a)
+	return fmt.Sprintf("%s(%d, %d)", t.String(), a.Type(), a.Code())
+}
+
+// SerializeTo writes the ICMPv4TypeCode value to the 'bytes' buffer.
+func (a ICMPv4TypeCode) SerializeTo(bytes []byte) {
+	binary.BigEndian.PutUint16(bytes, uint16(a))
+}
+
+// CreateICMPv4TypeCode is a convenience function to create an ICMPv4TypeCode
+// gopacket type from the ICMPv4 type and code values.
+func CreateICMPv4TypeCode(typ uint8, code uint8) ICMPv4TypeCode {
+	return ICMPv4TypeCode(binary.BigEndian.Uint16([]byte{typ, code}))
+}
+
+// ICMPv4 is the layer for IPv4 ICMP packet data.
+type ICMPv4 struct {
+	BaseLayer
+	TypeCode ICMPv4TypeCode
+	Checksum uint16
+	Id       uint16
+	Seq      uint16
+}
+
+// LayerType returns LayerTypeICMPv4.
+func (i *ICMPv4) LayerType() gopacket.LayerType { return LayerTypeICMPv4 }
+
+// DecodeFromBytes decodes the given bytes into this layer.
+func (i *ICMPv4) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+	if len(data) < 8 {
+		df.SetTruncated()
+		return errors.New("ICMP layer less then 8 bytes for ICMPv4 packet")
+	}
+	i.TypeCode = CreateICMPv4TypeCode(data[0], data[1])
+	i.Checksum = binary.BigEndian.Uint16(data[2:4])
+	i.Id = binary.BigEndian.Uint16(data[4:6])
+	i.Seq = binary.BigEndian.Uint16(data[6:8])
+	i.BaseLayer = BaseLayer{data[:8], data[8:]}
+	return nil
+}
+
+// SerializeTo writes the serialized form of this layer into the
+// SerializationBuffer, implementing gopacket.SerializableLayer.
+// See the docs for gopacket.SerializableLayer for more info.
+func (i *ICMPv4) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	bytes, err := b.PrependBytes(8)
+	if err != nil {
+		return err
+	}
+	i.TypeCode.SerializeTo(bytes)
+	binary.BigEndian.PutUint16(bytes[4:], i.Id)
+	binary.BigEndian.PutUint16(bytes[6:], i.Seq)
+	if opts.ComputeChecksums {
+		bytes[2] = 0
+		bytes[3] = 0
+		i.Checksum = tcpipChecksum(b.Bytes(), 0)
+	}
+	binary.BigEndian.PutUint16(bytes[2:], i.Checksum)
+	return nil
+}
+
+// CanDecode returns the set of layer types that this DecodingLayer can decode.
+func (i *ICMPv4) CanDecode() gopacket.LayerClass {
+	return LayerTypeICMPv4
+}
+
+// NextLayerType returns the layer type contained by this DecodingLayer.
+func (i *ICMPv4) NextLayerType() gopacket.LayerType {
+	return gopacket.LayerTypePayload
+}
+
+func decodeICMPv4(data []byte, p gopacket.PacketBuilder) error {
+	i := &ICMPv4{}
+	return decodingLayerDecoder(i, data, p)
+}

vendor/github.com/google/gopacket/layers/icmp6.go

@@ -0,0 +1,266 @@
+// Copyright 2012 Google, Inc. All rights reserved.
+// Copyright 2009-2011 Andreas Krennmair. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+package layers
+
+import (
+	"encoding/binary"
+	"errors"
+	"fmt"
+	"reflect"
+
+	"github.com/google/gopacket"
+)
+
+const (
+	// The following are from RFC 4443
+	ICMPv6TypeDestinationUnreachable = 1
+	ICMPv6TypePacketTooBig           = 2
+	ICMPv6TypeTimeExceeded           = 3
+	ICMPv6TypeParameterProblem       = 4
+	ICMPv6TypeEchoRequest            = 128
+	ICMPv6TypeEchoReply              = 129
+
+	// The following are from RFC 4861
+	ICMPv6TypeRouterSolicitation    = 133
+	ICMPv6TypeRouterAdvertisement   = 134
+	ICMPv6TypeNeighborSolicitation  = 135
+	ICMPv6TypeNeighborAdvertisement = 136
+	ICMPv6TypeRedirect              = 137
+
+	// The following are from RFC 2710
+	ICMPv6TypeMLDv1MulticastListenerQueryMessage  = 130
+	ICMPv6TypeMLDv1MulticastListenerReportMessage = 131
+	ICMPv6TypeMLDv1MulticastListenerDoneMessage   = 132
+
+	// The following are from RFC 3810
+	ICMPv6TypeMLDv2MulticastListenerReportMessageV2 = 143
+)
+
+const (
+	// DestinationUnreachable
+	ICMPv6CodeNoRouteToDst           = 0
+	ICMPv6CodeAdminProhibited        = 1
+	ICMPv6CodeBeyondScopeOfSrc       = 2
+	ICMPv6CodeAddressUnreachable     = 3
+	ICMPv6CodePortUnreachable        = 4
+	ICMPv6CodeSrcAddressFailedPolicy = 5
+	ICMPv6CodeRejectRouteToDst       = 6
+
+	// TimeExceeded
+	ICMPv6CodeHopLimitExceeded               = 0
+	ICMPv6CodeFragmentReassemblyTimeExceeded = 1
+
+	// ParameterProblem
+	ICMPv6CodeErroneousHeaderField   = 0
+	ICMPv6CodeUnrecognizedNextHeader = 1
+	ICMPv6CodeUnrecognizedIPv6Option = 2
+)
+
+type icmpv6TypeCodeInfoStruct struct {
+	typeStr string
+	codeStr *map[uint8]string
+}
+
+var (
+	icmpv6TypeCodeInfo = map[uint8]icmpv6TypeCodeInfoStruct{
+		ICMPv6TypeDestinationUnreachable: icmpv6TypeCodeInfoStruct{
+			"DestinationUnreachable", &map[uint8]string{
+				ICMPv6CodeNoRouteToDst:           "NoRouteToDst",
+				ICMPv6CodeAdminProhibited:        "AdminProhibited",
+				ICMPv6CodeBeyondScopeOfSrc:       "BeyondScopeOfSrc",
+				ICMPv6CodeAddressUnreachable:     "AddressUnreachable",
+				ICMPv6CodePortUnreachable:        "PortUnreachable",
+				ICMPv6CodeSrcAddressFailedPolicy: "SrcAddressFailedPolicy",
+				ICMPv6CodeRejectRouteToDst:       "RejectRouteToDst",
+			},
+		},
+		ICMPv6TypePacketTooBig: icmpv6TypeCodeInfoStruct{
+			"PacketTooBig", nil,
+		},
+		ICMPv6TypeTimeExceeded: icmpv6TypeCodeInfoStruct{
+			"TimeExceeded", &map[uint8]string{
+				ICMPv6CodeHopLimitExceeded:               "HopLimitExceeded",
+				ICMPv6CodeFragmentReassemblyTimeExceeded: "FragmentReassemblyTimeExceeded",
+			},
+		},
+		ICMPv6TypeParameterProblem: icmpv6TypeCodeInfoStruct{
+			"ParameterProblem", &map[uint8]string{
+				ICMPv6CodeErroneousHeaderField:   "ErroneousHeaderField",
+				ICMPv6CodeUnrecognizedNextHeader: "UnrecognizedNextHeader",
+				ICMPv6CodeUnrecognizedIPv6Option: "UnrecognizedIPv6Option",
+			},
+		},
+		ICMPv6TypeEchoRequest: icmpv6TypeCodeInfoStruct{
+			"EchoRequest", nil,
+		},
+		ICMPv6TypeEchoReply: icmpv6TypeCodeInfoStruct{
+			"EchoReply", nil,
+		},
+		ICMPv6TypeRouterSolicitation: icmpv6TypeCodeInfoStruct{
+			"RouterSolicitation", nil,
+		},
+		ICMPv6TypeRouterAdvertisement: icmpv6TypeCodeInfoStruct{
+			"RouterAdvertisement", nil,
+		},
+		ICMPv6TypeNeighborSolicitation: icmpv6TypeCodeInfoStruct{
+			"NeighborSolicitation", nil,
+		},
+		ICMPv6TypeNeighborAdvertisement: icmpv6TypeCodeInfoStruct{
+			"NeighborAdvertisement", nil,
+		},
+		ICMPv6TypeRedirect: icmpv6TypeCodeInfoStruct{
+			"Redirect", nil,
+		},
+	}
+)
+
+type ICMPv6TypeCode uint16
+
+// Type returns the ICMPv6 type field.
+func (a ICMPv6TypeCode) Type() uint8 {
+	return uint8(a >> 8)
+}
+
+// Code returns the ICMPv6 code field.
+func (a ICMPv6TypeCode) Code() uint8 {
+	return uint8(a)
+}
+
+func (a ICMPv6TypeCode) String() string {
+	t, c := a.Type(), a.Code()
+	strInfo, ok := icmpv6TypeCodeInfo[t]
+	if !ok {
+		// Unknown ICMPv6 type field
+		return fmt.Sprintf("%d(%d)", t, c)
+	}
+	typeStr := strInfo.typeStr
+	if strInfo.codeStr == nil && c == 0 {
+		// The ICMPv6 type does not make use of the code field
+		return fmt.Sprintf("%s", strInfo.typeStr)
+	}
+	if strInfo.codeStr == nil && c != 0 {
+		// The ICMPv6 type does not make use of the code field, but it is present anyway
+		return fmt.Sprintf("%s(Code: %d)", typeStr, c)
+	}
+	codeStr, ok := (*strInfo.codeStr)[c]
+	if !ok {
+		// We don't know this ICMPv6 code; print the numerical value
+		return fmt.Sprintf("%s(Code: %d)", typeStr, c)
+	}
+	return fmt.Sprintf("%s(%s)", typeStr, codeStr)
+}
+
+func (a ICMPv6TypeCode) GoString() string {
+	t := reflect.TypeOf(a)
+	return fmt.Sprintf("%s(%d, %d)", t.String(), a.Type(), a.Code())
+}
+
+// SerializeTo writes the ICMPv6TypeCode value to the 'bytes' buffer.
+func (a ICMPv6TypeCode) SerializeTo(bytes []byte) {
+	binary.BigEndian.PutUint16(bytes, uint16(a))
+}
+
+// CreateICMPv6TypeCode is a convenience function to create an ICMPv6TypeCode
+// gopacket type from the ICMPv6 type and code values.
+func CreateICMPv6TypeCode(typ uint8, code uint8) ICMPv6TypeCode {
+	return ICMPv6TypeCode(binary.BigEndian.Uint16([]byte{typ, code}))
+}
+
+// ICMPv6 is the layer for IPv6 ICMP packet data
+type ICMPv6 struct {
+	BaseLayer
+	TypeCode ICMPv6TypeCode
+	Checksum uint16
+	// TypeBytes is deprecated and always nil. See the different ICMPv6 message types
+	// instead (e.g. ICMPv6TypeRouterSolicitation).
+	TypeBytes []byte
+	tcpipchecksum
+}
+
+// LayerType returns LayerTypeICMPv6.
+func (i *ICMPv6) LayerType() gopacket.LayerType { return LayerTypeICMPv6 }
+
+// DecodeFromBytes decodes the given bytes into this layer.
+func (i *ICMPv6) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+	if len(data) < 4 {
+		df.SetTruncated()
+		return errors.New("ICMP layer less then 4 bytes for ICMPv6 packet")
+	}
+	i.TypeCode = CreateICMPv6TypeCode(data[0], data[1])
+	i.Checksum = binary.BigEndian.Uint16(data[2:4])
+	i.BaseLayer = BaseLayer{data[:4], data[4:]}
+	return nil
+}
+
+// SerializeTo writes the serialized form of this layer into the
+// SerializationBuffer, implementing gopacket.SerializableLayer.
+// See the docs for gopacket.SerializableLayer for more info.
+func (i *ICMPv6) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	bytes, err := b.PrependBytes(4)
+	if err != nil {
+		return err
+	}
+	i.TypeCode.SerializeTo(bytes)
+
+	if opts.ComputeChecksums {
+		bytes[2] = 0
+		bytes[3] = 0
+		csum, err := i.computeChecksum(b.Bytes(), IPProtocolICMPv6)
+		if err != nil {
+			return err
+		}
+		i.Checksum = csum
+	}
+	binary.BigEndian.PutUint16(bytes[2:], i.Checksum)
+
+	return nil
+}
+
+// CanDecode returns the set of layer types that this DecodingLayer can decode.
+func (i *ICMPv6) CanDecode() gopacket.LayerClass {
+	return LayerTypeICMPv6
+}
+
+// NextLayerType returns the layer type contained by this DecodingLayer.
+func (i *ICMPv6) NextLayerType() gopacket.LayerType {
+	switch i.TypeCode.Type() {
+	case ICMPv6TypeEchoRequest:
+		return LayerTypeICMPv6Echo
+	case ICMPv6TypeEchoReply:
+		return LayerTypeICMPv6Echo
+	case ICMPv6TypeRouterSolicitation:
+		return LayerTypeICMPv6RouterSolicitation
+	case ICMPv6TypeRouterAdvertisement:
+		return LayerTypeICMPv6RouterAdvertisement
+	case ICMPv6TypeNeighborSolicitation:
+		return LayerTypeICMPv6NeighborSolicitation
+	case ICMPv6TypeNeighborAdvertisement:
+		return LayerTypeICMPv6NeighborAdvertisement
+	case ICMPv6TypeRedirect:
+		return LayerTypeICMPv6Redirect
+	case ICMPv6TypeMLDv1MulticastListenerQueryMessage: // Same Code for MLDv1 Query and MLDv2 Query
+		if len(i.Payload) > 20 { // Only payload size differs
+			return LayerTypeMLDv2MulticastListenerQuery
+		} else {
+			return LayerTypeMLDv1MulticastListenerQuery
+		}
+	case ICMPv6TypeMLDv1MulticastListenerDoneMessage:
+		return LayerTypeMLDv1MulticastListenerDone
+	case ICMPv6TypeMLDv1MulticastListenerReportMessage:
+		return LayerTypeMLDv1MulticastListenerReport
+	case ICMPv6TypeMLDv2MulticastListenerReportMessageV2:
+		return LayerTypeMLDv2MulticastListenerReport
+	}
+
+	return gopacket.LayerTypePayload
+}
+
+func decodeICMPv6(data []byte, p gopacket.PacketBuilder) error {
+	i := &ICMPv6{}
+	return decodingLayerDecoder(i, data, p)
+}

vendor/github.com/google/gopacket/layers/icmp6msg.go

@@ -0,0 +1,578 @@
+// Copyright 2012 Google, Inc. All rights reserved.
+// Copyright 2009-2011 Andreas Krennmair. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+package layers
+
+import (
+	"encoding/binary"
+	"encoding/hex"
+	"errors"
+	"fmt"
+	"net"
+	"time"
+
+	"github.com/google/gopacket"
+)
+
+// Based on RFC 4861
+
+// ICMPv6Opt indicate how to decode the data associated with each ICMPv6Option.
+type ICMPv6Opt uint8
+
+const (
+	_ ICMPv6Opt = iota
+
+	// ICMPv6OptSourceAddress contains the link-layer address of the sender of
+	// the packet. It is used in the Neighbor Solicitation, Router
+	// Solicitation, and Router Advertisement packets. Must be ignored for other
+	// Neighbor discovery messages.
+	ICMPv6OptSourceAddress
+
+	// ICMPv6OptTargetAddress contains the link-layer address of the target. It
+	// is used in Neighbor Advertisement and Redirect packets. Must be ignored
+	// for other Neighbor discovery messages.
+	ICMPv6OptTargetAddress
+
+	// ICMPv6OptPrefixInfo provides hosts with on-link prefixes and prefixes
+	// for Address Autoconfiguration. The Prefix Information option appears in
+	// Router Advertisement packets and MUST be silently ignored for other
+	// messages.
+	ICMPv6OptPrefixInfo
+
+	// ICMPv6OptRedirectedHeader is used in Redirect messages and contains all
+	// or part of the packet that is being redirected.
+	ICMPv6OptRedirectedHeader
+
+	// ICMPv6OptMTU is used in Router Advertisement messages to ensure that all
+	// nodes on a link use the same MTU value in those cases where the link MTU
+	// is not well known. This option MUST be silently ignored for other
+	// Neighbor Discovery messages.
+	ICMPv6OptMTU
+)
+
+// ICMPv6Echo represents the structure of a ping.
+type ICMPv6Echo struct {
+	BaseLayer
+	Identifier uint16
+	SeqNumber  uint16
+}
+
+// ICMPv6RouterSolicitation is sent by hosts to find routers.
+type ICMPv6RouterSolicitation struct {
+	BaseLayer
+	Options ICMPv6Options
+}
+
+// ICMPv6RouterAdvertisement is sent by routers in response to Solicitation.
+type ICMPv6RouterAdvertisement struct {
+	BaseLayer
+	HopLimit       uint8
+	Flags          uint8
+	RouterLifetime uint16
+	ReachableTime  uint32
+	RetransTimer   uint32
+	Options        ICMPv6Options
+}
+
+// ICMPv6NeighborSolicitation is sent to request the link-layer address of a
+// target node.
+type ICMPv6NeighborSolicitation struct {
+	BaseLayer
+	TargetAddress net.IP
+	Options       ICMPv6Options
+}
+
+// ICMPv6NeighborAdvertisement is sent by nodes in response to Solicitation.
+type ICMPv6NeighborAdvertisement struct {
+	BaseLayer
+	Flags         uint8
+	TargetAddress net.IP
+	Options       ICMPv6Options
+}
+
+// ICMPv6Redirect is sent by routers to inform hosts of a better first-hop node
+// on the path to a destination.
+type ICMPv6Redirect struct {
+	BaseLayer
+	TargetAddress      net.IP
+	DestinationAddress net.IP
+	Options            ICMPv6Options
+}
+
+// ICMPv6Option contains the type and data for a single option.
+type ICMPv6Option struct {
+	Type ICMPv6Opt
+	Data []byte
+}
+
+// ICMPv6Options is a slice of ICMPv6Option.
+type ICMPv6Options []ICMPv6Option
+
+func (i ICMPv6Opt) String() string {
+	switch i {
+	case ICMPv6OptSourceAddress:
+		return "SourceAddress"
+	case ICMPv6OptTargetAddress:
+		return "TargetAddress"
+	case ICMPv6OptPrefixInfo:
+		return "PrefixInfo"
+	case ICMPv6OptRedirectedHeader:
+		return "RedirectedHeader"
+	case ICMPv6OptMTU:
+		return "MTU"
+	default:
+		return fmt.Sprintf("Unknown(%d)", i)
+	}
+}
+
+// CanDecode returns the set of layer types that this DecodingLayer can decode.
+func (i *ICMPv6Echo) CanDecode() gopacket.LayerClass {
+	return LayerTypeICMPv6Echo
+}
+
+// LayerType returns LayerTypeICMPv6Echo.
+func (i *ICMPv6Echo) LayerType() gopacket.LayerType {
+	return LayerTypeICMPv6Echo
+}
+
+// NextLayerType returns the layer type contained by this DecodingLayer.
+func (i *ICMPv6Echo) NextLayerType() gopacket.LayerType {
+	return gopacket.LayerTypePayload
+}
+
+// DecodeFromBytes decodes the given bytes into this layer.
+func (i *ICMPv6Echo) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+	if len(data) < 4 {
+		df.SetTruncated()
+		return errors.New("ICMP layer less then 4 bytes for ICMPv6 Echo")
+	}
+	i.Identifier = binary.BigEndian.Uint16(data[0:2])
+	i.SeqNumber = binary.BigEndian.Uint16(data[2:4])
+
+	return nil
+}
+
+// SerializeTo writes the serialized form of this layer into the
+// SerializationBuffer, implementing gopacket.SerializableLayer.
+// See the docs for gopacket.SerializableLayer for more info.
+func (i *ICMPv6Echo) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	buf, err := b.PrependBytes(4)
+	if err != nil {
+		return err
+	}
+
+	binary.BigEndian.PutUint16(buf, i.Identifier)
+	binary.BigEndian.PutUint16(buf[2:], i.SeqNumber)
+	return nil
+}
+
+// LayerType returns LayerTypeICMPv6.
+func (i *ICMPv6RouterSolicitation) LayerType() gopacket.LayerType {
+	return LayerTypeICMPv6RouterSolicitation
+}
+
+// NextLayerType returns the layer type contained by this DecodingLayer.
+func (i *ICMPv6RouterSolicitation) NextLayerType() gopacket.LayerType {
+	return gopacket.LayerTypePayload
+}
+
+// DecodeFromBytes decodes the given bytes into this layer.
+func (i *ICMPv6RouterSolicitation) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+	// first 4 bytes are reserved followed by options
+	if len(data) < 4 {
+		df.SetTruncated()
+		return errors.New("ICMP layer less then 4 bytes for ICMPv6 router solicitation")
+	}
+
+	// truncate old options
+	i.Options = i.Options[:0]
+
+	return i.Options.DecodeFromBytes(data[4:], df)
+}
+
+// SerializeTo writes the serialized form of this layer into the
+// SerializationBuffer, implementing gopacket.SerializableLayer.
+// See the docs for gopacket.SerializableLayer for more info.
+func (i *ICMPv6RouterSolicitation) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	if err := i.Options.SerializeTo(b, opts); err != nil {
+		return err
+	}
+
+	buf, err := b.PrependBytes(4)
+	if err != nil {
+		return err
+	}
+
+	copy(buf, lotsOfZeros[:4])
+	return nil
+}
+
+// CanDecode returns the set of layer types that this DecodingLayer can decode.
+func (i *ICMPv6RouterSolicitation) CanDecode() gopacket.LayerClass {
+	return LayerTypeICMPv6RouterSolicitation
+}
+
+// LayerType returns LayerTypeICMPv6RouterAdvertisement.
+func (i *ICMPv6RouterAdvertisement) LayerType() gopacket.LayerType {
+	return LayerTypeICMPv6RouterAdvertisement
+}
+
+// NextLayerType returns the layer type contained by this DecodingLayer.
+func (i *ICMPv6RouterAdvertisement) NextLayerType() gopacket.LayerType {
+	return gopacket.LayerTypePayload
+}
+
+// DecodeFromBytes decodes the given bytes into this layer.
+func (i *ICMPv6RouterAdvertisement) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+	if len(data) < 12 {
+		df.SetTruncated()
+		return errors.New("ICMP layer less then 12 bytes for ICMPv6 router advertisement")
+	}
+
+	i.HopLimit = uint8(data[0])
+	// M, O bit followed by 6 reserved bits
+	i.Flags = uint8(data[1])
+	i.RouterLifetime = binary.BigEndian.Uint16(data[2:4])
+	i.ReachableTime = binary.BigEndian.Uint32(data[4:8])
+	i.RetransTimer = binary.BigEndian.Uint32(data[8:12])
+	i.BaseLayer = BaseLayer{data, nil} // assume no payload
+
+	// truncate old options
+	i.Options = i.Options[:0]
+
+	return i.Options.DecodeFromBytes(data[12:], df)
+}
+
+// SerializeTo writes the serialized form of this layer into the
+// SerializationBuffer, implementing gopacket.SerializableLayer.
+// See the docs for gopacket.SerializableLayer for more info.
+func (i *ICMPv6RouterAdvertisement) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	if err := i.Options.SerializeTo(b, opts); err != nil {
+		return err
+	}
+
+	buf, err := b.PrependBytes(12)
+	if err != nil {
+		return err
+	}
+
+	buf[0] = byte(i.HopLimit)
+	buf[1] = byte(i.Flags)
+	binary.BigEndian.PutUint16(buf[2:], i.RouterLifetime)
+	binary.BigEndian.PutUint32(buf[4:], i.ReachableTime)
+	binary.BigEndian.PutUint32(buf[8:], i.RetransTimer)
+	return nil
+}
+
+// CanDecode returns the set of layer types that this DecodingLayer can decode.
+func (i *ICMPv6RouterAdvertisement) CanDecode() gopacket.LayerClass {
+	return LayerTypeICMPv6RouterAdvertisement
+}
+
+// ManagedAddressConfig is true when addresses are available via DHCPv6. If
+// set, the OtherConfig flag is redundant.
+func (i *ICMPv6RouterAdvertisement) ManagedAddressConfig() bool {
+	return i.Flags&0x80 != 0
+}
+
+// OtherConfig is true when there is other configuration information available
+// via DHCPv6. For example, DNS-related information.
+func (i *ICMPv6RouterAdvertisement) OtherConfig() bool {
+	return i.Flags&0x40 != 0
+}
+
+// LayerType returns LayerTypeICMPv6NeighborSolicitation.
+func (i *ICMPv6NeighborSolicitation) LayerType() gopacket.LayerType {
+	return LayerTypeICMPv6NeighborSolicitation
+}
+
+// NextLayerType returns the layer type contained by this DecodingLayer.
+func (i *ICMPv6NeighborSolicitation) NextLayerType() gopacket.LayerType {
+	return gopacket.LayerTypePayload
+}
+
+// DecodeFromBytes decodes the given bytes into this layer.
+func (i *ICMPv6NeighborSolicitation) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+	if len(data) < 20 {
+		df.SetTruncated()
+		return errors.New("ICMP layer less then 20 bytes for ICMPv6 neighbor solicitation")
+	}
+
+	i.TargetAddress = net.IP(data[4:20])
+	i.BaseLayer = BaseLayer{data, nil} // assume no payload
+
+	// truncate old options
+	i.Options = i.Options[:0]
+
+	return i.Options.DecodeFromBytes(data[20:], df)
+}
+
+// SerializeTo writes the serialized form of this layer into the
+// SerializationBuffer, implementing gopacket.SerializableLayer.
+// See the docs for gopacket.SerializableLayer for more info.
+func (i *ICMPv6NeighborSolicitation) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	if err := i.Options.SerializeTo(b, opts); err != nil {
+		return err
+	}
+
+	buf, err := b.PrependBytes(20)
+	if err != nil {
+		return err
+	}
+
+	copy(buf, lotsOfZeros[:4])
+	copy(buf[4:], i.TargetAddress)
+	return nil
+}
+
+// CanDecode returns the set of layer types that this DecodingLayer can decode.
+func (i *ICMPv6NeighborSolicitation) CanDecode() gopacket.LayerClass {
+	return LayerTypeICMPv6NeighborSolicitation
+}
+
+// LayerType returns LayerTypeICMPv6NeighborAdvertisement.
+func (i *ICMPv6NeighborAdvertisement) LayerType() gopacket.LayerType {
+	return LayerTypeICMPv6NeighborAdvertisement
+}
+
+// NextLayerType returns the layer type contained by this DecodingLayer.
+func (i *ICMPv6NeighborAdvertisement) NextLayerType() gopacket.LayerType {
+	return gopacket.LayerTypePayload
+}
+
+// DecodeFromBytes decodes the given bytes into this layer.
+func (i *ICMPv6NeighborAdvertisement) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+	if len(data) < 20 {
+		df.SetTruncated()
+		return errors.New("ICMP layer less then 20 bytes for ICMPv6 neighbor advertisement")
+	}
+
+	i.Flags = uint8(data[0])
+	i.TargetAddress = net.IP(data[4:20])
+	i.BaseLayer = BaseLayer{data, nil} // assume no payload
+
+	// truncate old options
+	i.Options = i.Options[:0]
+
+	return i.Options.DecodeFromBytes(data[20:], df)
+}
+
+// SerializeTo writes the serialized form of this layer into the
+// SerializationBuffer, implementing gopacket.SerializableLayer.
+// See the docs for gopacket.SerializableLayer for more info.
+func (i *ICMPv6NeighborAdvertisement) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	if err := i.Options.SerializeTo(b, opts); err != nil {
+		return err
+	}
+
+	buf, err := b.PrependBytes(20)
+	if err != nil {
+		return err
+	}
+
+	buf[0] = byte(i.Flags)
+	copy(buf[1:], lotsOfZeros[:3])
+	copy(buf[4:], i.TargetAddress)
+	return nil
+}
+
+// CanDecode returns the set of layer types that this DecodingLayer can decode.
+func (i *ICMPv6NeighborAdvertisement) CanDecode() gopacket.LayerClass {
+	return LayerTypeICMPv6NeighborAdvertisement
+}
+
+// Router indicates whether the sender is a router or not.
+func (i *ICMPv6NeighborAdvertisement) Router() bool {
+	return i.Flags&0x80 != 0
+}
+
+// Solicited indicates whether the advertisement was solicited or not.
+func (i *ICMPv6NeighborAdvertisement) Solicited() bool {
+	return i.Flags&0x40 != 0
+}
+
+// Override indicates whether the advertisement should Override an existing
+// cache entry.
+func (i *ICMPv6NeighborAdvertisement) Override() bool {
+	return i.Flags&0x20 != 0
+}
+
+// LayerType returns LayerTypeICMPv6Redirect.
+func (i *ICMPv6Redirect) LayerType() gopacket.LayerType {
+	return LayerTypeICMPv6Redirect
+}
+
+// NextLayerType returns the layer type contained by this DecodingLayer.
+func (i *ICMPv6Redirect) NextLayerType() gopacket.LayerType {
+	return gopacket.LayerTypePayload
+}
+
+// DecodeFromBytes decodes the given bytes into this layer.
+func (i *ICMPv6Redirect) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+	if len(data) < 36 {
+		df.SetTruncated()
+		return errors.New("ICMP layer less then 36 bytes for ICMPv6 redirect")
+	}
+
+	i.TargetAddress = net.IP(data[4:20])
+	i.DestinationAddress = net.IP(data[20:36])
+	i.BaseLayer = BaseLayer{data, nil} // assume no payload
+
+	// truncate old options
+	i.Options = i.Options[:0]
+
+	return i.Options.DecodeFromBytes(data[36:], df)
+}
+
+// SerializeTo writes the serialized form of this layer into the
+// SerializationBuffer, implementing gopacket.SerializableLayer.
+// See the docs for gopacket.SerializableLayer for more info.
+func (i *ICMPv6Redirect) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	if err := i.Options.SerializeTo(b, opts); err != nil {
+		return err
+	}
+
+	buf, err := b.PrependBytes(36)
+	if err != nil {
+		return err
+	}
+
+	copy(buf, lotsOfZeros[:4])
+	copy(buf[4:], i.TargetAddress)
+	copy(buf[20:], i.DestinationAddress)
+	return nil
+}
+
+// CanDecode returns the set of layer types that this DecodingLayer can decode.
+func (i *ICMPv6Redirect) CanDecode() gopacket.LayerClass {
+	return LayerTypeICMPv6Redirect
+}
+
+func (i ICMPv6Option) String() string {
+	hd := hex.EncodeToString(i.Data)
+	if len(hd) > 0 {
+		hd = " 0x" + hd
+	}
+
+	switch i.Type {
+	case ICMPv6OptSourceAddress, ICMPv6OptTargetAddress:
+		return fmt.Sprintf("ICMPv6Option(%s:%v)",
+			i.Type,
+			net.HardwareAddr(i.Data))
+	case ICMPv6OptPrefixInfo:
+		if len(i.Data) == 30 {
+			prefixLen := uint8(i.Data[0])
+			onLink := (i.Data[1]&0x80 != 0)
+			autonomous := (i.Data[1]&0x40 != 0)
+			validLifetime := time.Duration(binary.BigEndian.Uint32(i.Data[2:6])) * time.Second
+			preferredLifetime := time.Duration(binary.BigEndian.Uint32(i.Data[6:10])) * time.Second
+
+			prefix := net.IP(i.Data[14:])
+
+			return fmt.Sprintf("ICMPv6Option(%s:%v/%v:%t:%t:%v:%v)",
+				i.Type,
+				prefix, prefixLen,
+				onLink, autonomous,
+				validLifetime, preferredLifetime)
+		}
+	case ICMPv6OptRedirectedHeader:
+		// could invoke IP decoder on data... probably best not to
+		break
+	case ICMPv6OptMTU:
+		if len(i.Data) == 6 {
+			return fmt.Sprintf("ICMPv6Option(%s:%v)",
+				i.Type,
+				binary.BigEndian.Uint32(i.Data[2:]))
+		}
+
+	}
+	return fmt.Sprintf("ICMPv6Option(%s:%s)", i.Type, hd)
+}
+
+// DecodeFromBytes decodes the given bytes into this layer.
+func (i *ICMPv6Options) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+	for len(data) > 0 {
+		if len(data) < 2 {
+			df.SetTruncated()
+			return errors.New("ICMP layer less then 2 bytes for ICMPv6 message option")
+		}
+
+		// unit is 8 octets, convert to bytes
+		length := int(data[1]) * 8
+
+		if length == 0 {
+			df.SetTruncated()
+			return errors.New("ICMPv6 message option with length 0")
+		}
+
+		if len(data) < length {
+			df.SetTruncated()
+			return fmt.Errorf("ICMP layer only %v bytes for ICMPv6 message option with length %v", len(data), length)
+		}
+
+		o := ICMPv6Option{
+			Type: ICMPv6Opt(data[0]),
+			Data: data[2:length],
+		}
+
+		// chop off option we just consumed
+		data = data[length:]
+
+		*i = append(*i, o)
+	}
+
+	return nil
+}
+
+// SerializeTo writes the serialized form of this layer into the
+// SerializationBuffer, implementing gopacket.SerializableLayer.
+// See the docs for gopacket.SerializableLayer for more info.
+func (i *ICMPv6Options) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	for _, opt := range []ICMPv6Option(*i) {
+		length := len(opt.Data) + 2
+		buf, err := b.PrependBytes(length)
+		if err != nil {
+			return err
+		}
+
+		buf[0] = byte(opt.Type)
+		buf[1] = byte(length / 8)
+		copy(buf[2:], opt.Data)
+	}
+
+	return nil
+}
+
+func decodeICMPv6Echo(data []byte, p gopacket.PacketBuilder) error {
+	i := &ICMPv6Echo{}
+	return decodingLayerDecoder(i, data, p)
+}
+
+func decodeICMPv6RouterSolicitation(data []byte, p gopacket.PacketBuilder) error {
+	i := &ICMPv6RouterSolicitation{}
+	return decodingLayerDecoder(i, data, p)
+}
+
+func decodeICMPv6RouterAdvertisement(data []byte, p gopacket.PacketBuilder) error {
+	i := &ICMPv6RouterAdvertisement{}
+	return decodingLayerDecoder(i, data, p)
+}
+
+func decodeICMPv6NeighborSolicitation(data []byte, p gopacket.PacketBuilder) error {
+	i := &ICMPv6NeighborSolicitation{}
+	return decodingLayerDecoder(i, data, p)
+}
+
+func decodeICMPv6NeighborAdvertisement(data []byte, p gopacket.PacketBuilder) error {
+	i := &ICMPv6NeighborAdvertisement{}
+	return decodingLayerDecoder(i, data, p)
+}
+
+func decodeICMPv6Redirect(data []byte, p gopacket.PacketBuilder) error {
+	i := &ICMPv6Redirect{}
+	return decodingLayerDecoder(i, data, p)
+}

vendor/github.com/google/gopacket/layers/igmp.go

@@ -0,0 +1,355 @@
+// Copyright 2012 Google, Inc. All rights reserved.
+// Copyright 2009-2011 Andreas Krennmair. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+package layers
+
+import (
+	"encoding/binary"
+	"errors"
+	"net"
+	"time"
+
+	"github.com/google/gopacket"
+)
+
+type IGMPType uint8
+
+const (
+	IGMPMembershipQuery    IGMPType = 0x11 // General or group specific query
+	IGMPMembershipReportV1 IGMPType = 0x12 // Version 1 Membership Report
+	IGMPMembershipReportV2 IGMPType = 0x16 // Version 2 Membership Report
+	IGMPLeaveGroup         IGMPType = 0x17 // Leave Group
+	IGMPMembershipReportV3 IGMPType = 0x22 // Version 3 Membership Report
+)
+
+// String conversions for IGMP message types
+func (i IGMPType) String() string {
+	switch i {
+	case IGMPMembershipQuery:
+		return "IGMP Membership Query"
+	case IGMPMembershipReportV1:
+		return "IGMPv1 Membership Report"
+	case IGMPMembershipReportV2:
+		return "IGMPv2 Membership Report"
+	case IGMPMembershipReportV3:
+		return "IGMPv3 Membership Report"
+	case IGMPLeaveGroup:
+		return "Leave Group"
+	default:
+		return ""
+	}
+}
+
+type IGMPv3GroupRecordType uint8
+
+const (
+	IGMPIsIn  IGMPv3GroupRecordType = 0x01 // Type MODE_IS_INCLUDE, source addresses x
+	IGMPIsEx  IGMPv3GroupRecordType = 0x02 // Type MODE_IS_EXCLUDE, source addresses x
+	IGMPToIn  IGMPv3GroupRecordType = 0x03 // Type CHANGE_TO_INCLUDE_MODE, source addresses x
+	IGMPToEx  IGMPv3GroupRecordType = 0x04 // Type CHANGE_TO_EXCLUDE_MODE, source addresses x
+	IGMPAllow IGMPv3GroupRecordType = 0x05 // Type ALLOW_NEW_SOURCES, source addresses x
+	IGMPBlock IGMPv3GroupRecordType = 0x06 // Type BLOCK_OLD_SOURCES, source addresses x
+)
+
+func (i IGMPv3GroupRecordType) String() string {
+	switch i {
+	case IGMPIsIn:
+		return "MODE_IS_INCLUDE"
+	case IGMPIsEx:
+		return "MODE_IS_EXCLUDE"
+	case IGMPToIn:
+		return "CHANGE_TO_INCLUDE_MODE"
+	case IGMPToEx:
+		return "CHANGE_TO_EXCLUDE_MODE"
+	case IGMPAllow:
+		return "ALLOW_NEW_SOURCES"
+	case IGMPBlock:
+		return "BLOCK_OLD_SOURCES"
+	default:
+		return ""
+	}
+}
+
+// IGMP represents an IGMPv3 message.
+type IGMP struct {
+	BaseLayer
+	Type                    IGMPType
+	MaxResponseTime         time.Duration
+	Checksum                uint16
+	GroupAddress            net.IP
+	SupressRouterProcessing bool
+	RobustnessValue         uint8
+	IntervalTime            time.Duration
+	SourceAddresses         []net.IP
+	NumberOfGroupRecords    uint16
+	NumberOfSources         uint16
+	GroupRecords            []IGMPv3GroupRecord
+	Version                 uint8 // IGMP protocol version
+}
+
+// IGMPv1or2 stores header details for an IGMPv1 or IGMPv2 packet.
+//
+//  0                   1                   2                   3
+//  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+// |      Type     | Max Resp Time |           Checksum            |
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+// |                         Group Address                         |
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+type IGMPv1or2 struct {
+	BaseLayer
+	Type            IGMPType      // IGMP message type
+	MaxResponseTime time.Duration // meaningful only in Membership Query messages
+	Checksum        uint16        // 16-bit checksum of entire ip payload
+	GroupAddress    net.IP        // either 0 or an IP multicast address
+	Version         uint8
+}
+
+// decodeResponse dissects IGMPv1 or IGMPv2 packet.
+func (i *IGMPv1or2) decodeResponse(data []byte) error {
+	if len(data) < 8 {
+		return errors.New("IGMP packet too small")
+	}
+
+	i.MaxResponseTime = igmpTimeDecode(data[1])
+	i.Checksum = binary.BigEndian.Uint16(data[2:4])
+	i.GroupAddress = net.IP(data[4:8])
+
+	return nil
+}
+
+//  0                   1                   2                   3
+//  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+// |  Type = 0x22  |    Reserved   |           Checksum            |
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+// |           Reserved            |  Number of Group Records (M)  |
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+// |                                                               |
+// .                        Group Record [1]                       .
+// |                                                               |
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+// |                                                               |
+// .                        Group Record [2]                       .
+// |                                                               |
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+// |                                                               |
+// .                        Group Record [M]                       .
+// |                                                               |
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+// |  Record Type  |  Aux Data Len |     Number of Sources (N)     |
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+// |                       Multicast Address                       |
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+// |                       Source Address [1]                      |
+// +-                                                             -+
+// |                       Source Address [2]                      |
+// +-                                                             -+
+// |                       Source Address [N]                      |
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+// |                                                               |
+// .                         Auxiliary Data                        .
+// |                                                               |
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+
+// IGMPv3GroupRecord stores individual group records for a V3 Membership Report message.
+type IGMPv3GroupRecord struct {
+	Type             IGMPv3GroupRecordType
+	AuxDataLen       uint8 // this should always be 0 as per IGMPv3 spec.
+	NumberOfSources  uint16
+	MulticastAddress net.IP
+	SourceAddresses  []net.IP
+	AuxData          uint32 // NOT USED
+}
+
+func (i *IGMP) decodeIGMPv3MembershipReport(data []byte) error {
+	if len(data) < 8 {
+		return errors.New("IGMPv3 Membership Report too small #1")
+	}
+
+	i.Checksum = binary.BigEndian.Uint16(data[2:4])
+	i.NumberOfGroupRecords = binary.BigEndian.Uint16(data[6:8])
+
+	recordOffset := 8
+	for j := 0; j < int(i.NumberOfGroupRecords); j++ {
+		if len(data) < recordOffset+8 {
+			return errors.New("IGMPv3 Membership Report too small #2")
+		}
+
+		var gr IGMPv3GroupRecord
+		gr.Type = IGMPv3GroupRecordType(data[recordOffset])
+		gr.AuxDataLen = data[recordOffset+1]
+		gr.NumberOfSources = binary.BigEndian.Uint16(data[recordOffset+2 : recordOffset+4])
+		gr.MulticastAddress = net.IP(data[recordOffset+4 : recordOffset+8])
+
+		if len(data) < recordOffset+8+int(gr.NumberOfSources)*4 {
+			return errors.New("IGMPv3 Membership Report too small #3")
+		}
+
+		// append source address records.
+		for i := 0; i < int(gr.NumberOfSources); i++ {
+			sourceAddr := net.IP(data[recordOffset+8+i*4 : recordOffset+12+i*4])
+			gr.SourceAddresses = append(gr.SourceAddresses, sourceAddr)
+		}
+
+		i.GroupRecords = append(i.GroupRecords, gr)
+		recordOffset += 8 + 4*int(gr.NumberOfSources)
+	}
+	return nil
+}
+
+//  0                   1                   2                   3
+//  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+// |  Type = 0x11  | Max Resp Code |           Checksum            |
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+// |                         Group Address                         |
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+// | Resv  |S| QRV |     QQIC      |     Number of Sources (N)     |
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+// |                       Source Address [1]                      |
+// +-                                                             -+
+// |                       Source Address [2]                      |
+// +-                              .                              -+
+// |                       Source Address [N]                      |
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//
+// decodeIGMPv3MembershipQuery parses the IGMPv3 message of type 0x11
+func (i *IGMP) decodeIGMPv3MembershipQuery(data []byte) error {
+	if len(data) < 12 {
+		return errors.New("IGMPv3 Membership Query too small #1")
+	}
+
+	i.MaxResponseTime = igmpTimeDecode(data[1])
+	i.Checksum = binary.BigEndian.Uint16(data[2:4])
+	i.SupressRouterProcessing = data[8]&0x8 != 0
+	i.GroupAddress = net.IP(data[4:8])
+	i.RobustnessValue = data[8] & 0x7
+	i.IntervalTime = igmpTimeDecode(data[9])
+	i.NumberOfSources = binary.BigEndian.Uint16(data[10:12])
+
+	if len(data) < 12+int(i.NumberOfSources)*4 {
+		return errors.New("IGMPv3 Membership Query too small #2")
+	}
+
+	for j := 0; j < int(i.NumberOfSources); j++ {
+		i.SourceAddresses = append(i.SourceAddresses, net.IP(data[12+j*4:16+j*4]))
+	}
+
+	return nil
+}
+
+// igmpTimeDecode decodes the duration created by the given byte, using the
+// algorithm in http://www.rfc-base.org/txt/rfc-3376.txt section 4.1.1.
+func igmpTimeDecode(t uint8) time.Duration {
+	if t&0x80 == 0 {
+		return time.Millisecond * 100 * time.Duration(t)
+	}
+	mant := (t & 0x70) >> 4
+	exp := t & 0x0F
+	return time.Millisecond * 100 * time.Duration((mant|0x10)<<(exp+3))
+}
+
+// LayerType returns LayerTypeIGMP for the V1,2,3 message protocol formats.
+func (i *IGMP) LayerType() gopacket.LayerType      { return LayerTypeIGMP }
+func (i *IGMPv1or2) LayerType() gopacket.LayerType { return LayerTypeIGMP }
+
+func (i *IGMPv1or2) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+	if len(data) < 8 {
+		return errors.New("IGMP Packet too small")
+	}
+
+	i.Type = IGMPType(data[0])
+	i.MaxResponseTime = igmpTimeDecode(data[1])
+	i.Checksum = binary.BigEndian.Uint16(data[2:4])
+	i.GroupAddress = net.IP(data[4:8])
+
+	return nil
+}
+
+func (i *IGMPv1or2) NextLayerType() gopacket.LayerType {
+	return gopacket.LayerTypeZero
+}
+
+func (i *IGMPv1or2) CanDecode() gopacket.LayerClass {
+	return LayerTypeIGMP
+}
+
+// DecodeFromBytes decodes the given bytes into this layer.
+func (i *IGMP) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+	if len(data) < 1 {
+		return errors.New("IGMP packet is too small")
+	}
+
+	// common IGMP header values between versions 1..3 of IGMP specification..
+	i.Type = IGMPType(data[0])
+
+	switch i.Type {
+	case IGMPMembershipQuery:
+		i.decodeIGMPv3MembershipQuery(data)
+	case IGMPMembershipReportV3:
+		i.decodeIGMPv3MembershipReport(data)
+	default:
+		return errors.New("unsupported IGMP type")
+	}
+
+	return nil
+}
+
+// CanDecode returns the set of layer types that this DecodingLayer can decode.
+func (i *IGMP) CanDecode() gopacket.LayerClass {
+	return LayerTypeIGMP
+}
+
+// NextLayerType returns the layer type contained by this DecodingLayer.
+func (i *IGMP) NextLayerType() gopacket.LayerType {
+	return gopacket.LayerTypeZero
+}
+
+// decodeIGMP will parse IGMP v1,2 or 3 protocols. Checks against the
+// IGMP type are performed against byte[0], logic then iniitalizes and
+// passes the appropriate struct (IGMP or IGMPv1or2) to
+// decodingLayerDecoder.
+func decodeIGMP(data []byte, p gopacket.PacketBuilder) error {
+	if len(data) < 1 {
+		return errors.New("IGMP packet is too small")
+	}
+
+	// byte 0 contains IGMP message type.
+	switch IGMPType(data[0]) {
+	case IGMPMembershipQuery:
+		// IGMPv3 Membership Query payload is >= 12
+		if len(data) >= 12 {
+			i := &IGMP{Version: 3}
+			return decodingLayerDecoder(i, data, p)
+		} else if len(data) == 8 {
+			i := &IGMPv1or2{}
+			if data[1] == 0x00 {
+				i.Version = 1 // IGMPv1 has a query length of 8 and MaxResp = 0
+			} else {
+				i.Version = 2 // IGMPv2 has a query length of 8 and MaxResp != 0
+			}
+
+			return decodingLayerDecoder(i, data, p)
+		}
+	case IGMPMembershipReportV3:
+		i := &IGMP{Version: 3}
+		return decodingLayerDecoder(i, data, p)
+	case IGMPMembershipReportV1:
+		i := &IGMPv1or2{Version: 1}
+		return decodingLayerDecoder(i, data, p)
+	case IGMPLeaveGroup, IGMPMembershipReportV2:
+		// leave group and Query Report v2 used in IGMPv2 only.
+		i := &IGMPv1or2{Version: 2}
+		return decodingLayerDecoder(i, data, p)
+	default:
+	}
+
+	return errors.New("Unable to determine IGMP type.")
+}

vendor/github.com/google/gopacket/layers/ip4.go

@@ -0,0 +1,325 @@
+// Copyright 2012 Google, Inc. All rights reserved.
+// Copyright 2009-2011 Andreas Krennmair. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+package layers
+
+import (
+	"encoding/binary"
+	"errors"
+	"fmt"
+	"net"
+	"strings"
+
+	"github.com/google/gopacket"
+)
+
+type IPv4Flag uint8
+
+const (
+	IPv4EvilBit       IPv4Flag = 1 << 2 // http://tools.ietf.org/html/rfc3514 ;)
+	IPv4DontFragment  IPv4Flag = 1 << 1
+	IPv4MoreFragments IPv4Flag = 1 << 0
+)
+
+func (f IPv4Flag) String() string {
+	var s []string
+	if f&IPv4EvilBit != 0 {
+		s = append(s, "Evil")
+	}
+	if f&IPv4DontFragment != 0 {
+		s = append(s, "DF")
+	}
+	if f&IPv4MoreFragments != 0 {
+		s = append(s, "MF")
+	}
+	return strings.Join(s, "|")
+}
+
+// IPv4 is the header of an IP packet.
+type IPv4 struct {
+	BaseLayer
+	Version    uint8
+	IHL        uint8
+	TOS        uint8
+	Length     uint16
+	Id         uint16
+	Flags      IPv4Flag
+	FragOffset uint16
+	TTL        uint8
+	Protocol   IPProtocol
+	Checksum   uint16
+	SrcIP      net.IP
+	DstIP      net.IP
+	Options    []IPv4Option
+	Padding    []byte
+}
+
+// LayerType returns LayerTypeIPv4
+func (i *IPv4) LayerType() gopacket.LayerType { return LayerTypeIPv4 }
+func (i *IPv4) NetworkFlow() gopacket.Flow {
+	return gopacket.NewFlow(EndpointIPv4, i.SrcIP, i.DstIP)
+}
+
+type IPv4Option struct {
+	OptionType   uint8
+	OptionLength uint8
+	OptionData   []byte
+}
+
+func (i IPv4Option) String() string {
+	return fmt.Sprintf("IPv4Option(%v:%v)", i.OptionType, i.OptionData)
+}
+
+// for the current ipv4 options, return the number of bytes (including
+// padding that the options used)
+func (ip *IPv4) getIPv4OptionSize() uint8 {
+	optionSize := uint8(0)
+	for _, opt := range ip.Options {
+		switch opt.OptionType {
+		case 0:
+			// this is the end of option lists
+			optionSize++
+		case 1:
+			// this is the padding
+			optionSize++
+		default:
+			optionSize += opt.OptionLength
+
+		}
+	}
+	// make sure the options are aligned to 32 bit boundary
+	if (optionSize % 4) != 0 {
+		optionSize += 4 - (optionSize % 4)
+	}
+	return optionSize
+}
+
+// SerializeTo writes the serialized form of this layer into the
+// SerializationBuffer, implementing gopacket.SerializableLayer.
+func (ip *IPv4) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	optionLength := ip.getIPv4OptionSize()
+	bytes, err := b.PrependBytes(20 + int(optionLength))
+	if err != nil {
+		return err
+	}
+	if opts.FixLengths {
+		ip.IHL = 5 + (optionLength / 4)
+		ip.Length = uint16(len(b.Bytes()))
+	}
+	bytes[0] = (ip.Version << 4) | ip.IHL
+	bytes[1] = ip.TOS
+	binary.BigEndian.PutUint16(bytes[2:], ip.Length)
+	binary.BigEndian.PutUint16(bytes[4:], ip.Id)
+	binary.BigEndian.PutUint16(bytes[6:], ip.flagsfrags())
+	bytes[8] = ip.TTL
+	bytes[9] = byte(ip.Protocol)
+	if err := ip.AddressTo4(); err != nil {
+		return err
+	}
+	copy(bytes[12:16], ip.SrcIP)
+	copy(bytes[16:20], ip.DstIP)
+
+	curLocation := 20
+	// Now, we will encode the options
+	for _, opt := range ip.Options {
+		switch opt.OptionType {
+		case 0:
+			// this is the end of option lists
+			bytes[curLocation] = 0
+			curLocation++
+		case 1:
+			// this is the padding
+			bytes[curLocation] = 1
+			curLocation++
+		default:
+			bytes[curLocation] = opt.OptionType
+			bytes[curLocation+1] = opt.OptionLength
+
+			// sanity checking to protect us from buffer overrun
+			if len(opt.OptionData) > int(opt.OptionLength-2) {
+				return errors.New("option length is smaller than length of option data")
+			}
+			copy(bytes[curLocation+2:curLocation+int(opt.OptionLength)], opt.OptionData)
+			curLocation += int(opt.OptionLength)
+		}
+	}
+
+	if opts.ComputeChecksums {
+		ip.Checksum = checksum(bytes)
+	}
+	binary.BigEndian.PutUint16(bytes[10:], ip.Checksum)
+	return nil
+}
+
+func checksum(bytes []byte) uint16 {
+	// Clear checksum bytes
+	bytes[10] = 0
+	bytes[11] = 0
+
+	// Compute checksum
+	var csum uint32
+	for i := 0; i < len(bytes); i += 2 {
+		csum += uint32(bytes[i]) << 8
+		csum += uint32(bytes[i+1])
+	}
+	for {
+		// Break when sum is less or equals to 0xFFFF
+		if csum <= 65535 {
+			break
+		}
+		// Add carry to the sum
+		csum = (csum >> 16) + uint32(uint16(csum))
+	}
+	// Flip all the bits
+	return ^uint16(csum)
+}
+
+func (ip *IPv4) flagsfrags() (ff uint16) {
+	ff |= uint16(ip.Flags) << 13
+	ff |= ip.FragOffset
+	return
+}
+
+// DecodeFromBytes decodes the given bytes into this layer.
+func (ip *IPv4) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+	if len(data) < 20 {
+		df.SetTruncated()
+		return fmt.Errorf("Invalid ip4 header. Length %d less than 20", len(data))
+	}
+	flagsfrags := binary.BigEndian.Uint16(data[6:8])
+
+	ip.Version = uint8(data[0]) >> 4
+	ip.IHL = uint8(data[0]) & 0x0F
+	ip.TOS = data[1]
+	ip.Length = binary.BigEndian.Uint16(data[2:4])
+	ip.Id = binary.BigEndian.Uint16(data[4:6])
+	ip.Flags = IPv4Flag(flagsfrags >> 13)
+	ip.FragOffset = flagsfrags & 0x1FFF
+	ip.TTL = data[8]
+	ip.Protocol = IPProtocol(data[9])
+	ip.Checksum = binary.BigEndian.Uint16(data[10:12])
+	ip.SrcIP = data[12:16]
+	ip.DstIP = data[16:20]
+	ip.Options = ip.Options[:0]
+	ip.Padding = nil
+	// Set up an initial guess for contents/payload... we'll reset these soon.
+	ip.BaseLayer = BaseLayer{Contents: data}
+
+	// This code is added for the following enviroment:
+	// * Windows 10 with TSO option activated. ( tested on Hyper-V, RealTek ethernet driver )
+	if ip.Length == 0 {
+		// If using TSO(TCP Segmentation Offload), length is zero.
+		// The actual packet length is the length of data.
+		ip.Length = uint16(len(data))
+	}
+
+	if ip.Length < 20 {
+		return fmt.Errorf("Invalid (too small) IP length (%d < 20)", ip.Length)
+	} else if ip.IHL < 5 {
+		return fmt.Errorf("Invalid (too small) IP header length (%d < 5)", ip.IHL)
+	} else if int(ip.IHL*4) > int(ip.Length) {
+		return fmt.Errorf("Invalid IP header length > IP length (%d > %d)", ip.IHL, ip.Length)
+	}
+	if cmp := len(data) - int(ip.Length); cmp > 0 {
+		data = data[:ip.Length]
+	} else if cmp < 0 {
+		df.SetTruncated()
+		if int(ip.IHL)*4 > len(data) {
+			return errors.New("Not all IP header bytes available")
+		}
+	}
+	ip.Contents = data[:ip.IHL*4]
+	ip.Payload = data[ip.IHL*4:]
+	// From here on, data contains the header options.
+	data = data[20 : ip.IHL*4]
+	// Pull out IP options
+	for len(data) > 0 {
+		if ip.Options == nil {
+			// Pre-allocate to avoid growing the slice too much.
+			ip.Options = make([]IPv4Option, 0, 4)
+		}
+		opt := IPv4Option{OptionType: data[0]}
+		switch opt.OptionType {
+		case 0: // End of options
+			opt.OptionLength = 1
+			ip.Options = append(ip.Options, opt)
+			ip.Padding = data[1:]
+			return nil
+		case 1: // 1 byte padding
+			opt.OptionLength = 1
+			data = data[1:]
+			ip.Options = append(ip.Options, opt)
+		default:
+			if len(data) < 2 {
+				df.SetTruncated()
+				return fmt.Errorf("Invalid ip4 option length. Length %d less than 2", len(data))
+			}
+			opt.OptionLength = data[1]
+			if len(data) < int(opt.OptionLength) {
+				df.SetTruncated()
+				return fmt.Errorf("IP option length exceeds remaining IP header size, option type %v length %v", opt.OptionType, opt.OptionLength)
+			}
+			if opt.OptionLength <= 2 {
+				return fmt.Errorf("Invalid IP option type %v length %d. Must be greater than 2", opt.OptionType, opt.OptionLength)
+			}
+			opt.OptionData = data[2:opt.OptionLength]
+			data = data[opt.OptionLength:]
+			ip.Options = append(ip.Options, opt)
+		}
+	}
+	return nil
+}
+
+func (i *IPv4) CanDecode() gopacket.LayerClass {
+	return LayerTypeIPv4
+}
+
+func (i *IPv4) NextLayerType() gopacket.LayerType {
+	if i.Flags&IPv4MoreFragments != 0 || i.FragOffset != 0 {
+		return gopacket.LayerTypeFragment
+	}
+	return i.Protocol.LayerType()
+}
+
+func decodeIPv4(data []byte, p gopacket.PacketBuilder) error {
+	ip := &IPv4{}
+	err := ip.DecodeFromBytes(data, p)
+	p.AddLayer(ip)
+	p.SetNetworkLayer(ip)
+	if err != nil {
+		return err
+	}
+	return p.NextDecoder(ip.NextLayerType())
+}
+
+func checkIPv4Address(addr net.IP) (net.IP, error) {
+	if c := addr.To4(); c != nil {
+		return c, nil
+	}
+	if len(addr) == net.IPv6len {
+		return nil, errors.New("address is IPv6")
+	}
+	return nil, fmt.Errorf("wrong length of %d bytes instead of %d", len(addr), net.IPv4len)
+}
+
+func (ip *IPv4) AddressTo4() error {
+	var src, dst net.IP
+
+	if addr, err := checkIPv4Address(ip.SrcIP); err != nil {
+		return fmt.Errorf("Invalid source IPv4 address (%s)", err)
+	} else {
+		src = addr
+	}
+	if addr, err := checkIPv4Address(ip.DstIP); err != nil {
+		return fmt.Errorf("Invalid destination IPv4 address (%s)", err)
+	} else {
+		dst = addr
+	}
+	ip.SrcIP = src
+	ip.DstIP = dst
+	return nil
+}

vendor/github.com/google/gopacket/layers/ip6.go

@@ -0,0 +1,722 @@
+// Copyright 2012 Google, Inc. All rights reserved.
+// Copyright 2009-2011 Andreas Krennmair. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+package layers
+
+import (
+	"encoding/binary"
+	"errors"
+	"fmt"
+	"net"
+
+	"github.com/google/gopacket"
+)
+
+const (
+	// IPv6HopByHopOptionJumbogram code as defined in RFC 2675
+	IPv6HopByHopOptionJumbogram = 0xC2
+)
+
+const (
+	ipv6MaxPayloadLength = 65535
+)
+
+// IPv6 is the layer for the IPv6 header.
+type IPv6 struct {
+	// http://www.networksorcery.com/enp/protocol/ipv6.htm
+	BaseLayer
+	Version      uint8
+	TrafficClass uint8
+	FlowLabel    uint32
+	Length       uint16
+	NextHeader   IPProtocol
+	HopLimit     uint8
+	SrcIP        net.IP
+	DstIP        net.IP
+	HopByHop     *IPv6HopByHop
+	// hbh will be pointed to by HopByHop if that layer exists.
+	hbh IPv6HopByHop
+}
+
+// LayerType returns LayerTypeIPv6
+func (ipv6 *IPv6) LayerType() gopacket.LayerType { return LayerTypeIPv6 }
+
+// NetworkFlow returns this new Flow (EndpointIPv6, SrcIP, DstIP)
+func (ipv6 *IPv6) NetworkFlow() gopacket.Flow {
+	return gopacket.NewFlow(EndpointIPv6, ipv6.SrcIP, ipv6.DstIP)
+}
+
+// Search for Jumbo Payload TLV in IPv6HopByHop and return (length, true) if found
+func getIPv6HopByHopJumboLength(hopopts *IPv6HopByHop) (uint32, bool, error) {
+	var tlv *IPv6HopByHopOption
+
+	for _, t := range hopopts.Options {
+		if t.OptionType == IPv6HopByHopOptionJumbogram {
+			tlv = t
+			break
+		}
+	}
+	if tlv == nil {
+		// Not found
+		return 0, false, nil
+	}
+	if len(tlv.OptionData) != 4 {
+		return 0, false, errors.New("Jumbo length TLV data must have length 4")
+	}
+	l := binary.BigEndian.Uint32(tlv.OptionData)
+	if l <= ipv6MaxPayloadLength {
+		return 0, false, fmt.Errorf("Jumbo length cannot be less than %d", ipv6MaxPayloadLength+1)
+	}
+	// Found
+	return l, true, nil
+}
+
+// Adds zero-valued Jumbo TLV to IPv6 header if it does not exist
+// (if necessary add hop-by-hop header)
+func addIPv6JumboOption(ip6 *IPv6) {
+	var tlv *IPv6HopByHopOption
+
+	if ip6.HopByHop == nil {
+		// Add IPv6 HopByHop
+		ip6.HopByHop = &IPv6HopByHop{}
+		ip6.HopByHop.NextHeader = ip6.NextHeader
+		ip6.HopByHop.HeaderLength = 0
+		ip6.NextHeader = IPProtocolIPv6HopByHop
+	}
+	for _, t := range ip6.HopByHop.Options {
+		if t.OptionType == IPv6HopByHopOptionJumbogram {
+			tlv = t
+			break
+		}
+	}
+	if tlv == nil {
+		// Add Jumbo TLV
+		tlv = &IPv6HopByHopOption{}
+		ip6.HopByHop.Options = append(ip6.HopByHop.Options, tlv)
+	}
+	tlv.SetJumboLength(0)
+}
+
+// Set jumbo length in serialized IPv6 payload (starting with HopByHop header)
+func setIPv6PayloadJumboLength(hbh []byte) error {
+	pLen := len(hbh)
+	if pLen < 8 {
+		//HopByHop is minimum 8 bytes
+		return fmt.Errorf("Invalid IPv6 payload (length %d)", pLen)
+	}
+	hbhLen := int((hbh[1] + 1) * 8)
+	if hbhLen > pLen {
+		return fmt.Errorf("Invalid hop-by-hop length (length: %d, payload: %d", hbhLen, pLen)
+	}
+	offset := 2 //start with options
+	for offset < hbhLen {
+		opt := hbh[offset]
+		if opt == 0 {
+			//Pad1
+			offset++
+			continue
+		}
+		optLen := int(hbh[offset+1])
+		if opt == IPv6HopByHopOptionJumbogram {
+			if optLen == 4 {
+				binary.BigEndian.PutUint32(hbh[offset+2:], uint32(pLen))
+				return nil
+			}
+			return fmt.Errorf("Jumbo TLV too short (%d bytes)", optLen)
+		}
+		offset += 2 + optLen
+	}
+	return errors.New("Jumbo TLV not found")
+}
+
+// SerializeTo writes the serialized form of this layer into the
+// SerializationBuffer, implementing gopacket.SerializableLayer.
+// See the docs for gopacket.SerializableLayer for more info.
+func (ipv6 *IPv6) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	var jumbo bool
+	var err error
+
+	payload := b.Bytes()
+	pLen := len(payload)
+	if pLen > ipv6MaxPayloadLength {
+		jumbo = true
+		if opts.FixLengths {
+			// We need to set the length later because the hop-by-hop header may
+			// not exist or else need padding, so pLen may yet change
+			addIPv6JumboOption(ipv6)
+		} else if ipv6.HopByHop == nil {
+			return fmt.Errorf("Cannot fit payload length of %d into IPv6 packet", pLen)
+		} else {
+			_, ok, err := getIPv6HopByHopJumboLength(ipv6.HopByHop)
+			if err != nil {
+				return err
+			}
+			if !ok {
+				return errors.New("Missing jumbo length hop-by-hop option")
+			}
+		}
+	}
+
+	hbhAlreadySerialized := false
+	if ipv6.HopByHop != nil {
+		for _, l := range b.Layers() {
+			if l == LayerTypeIPv6HopByHop {
+				hbhAlreadySerialized = true
+				break
+			}
+		}
+	}
+	if ipv6.HopByHop != nil && !hbhAlreadySerialized {
+		if ipv6.NextHeader != IPProtocolIPv6HopByHop {
+			// Just fix it instead of throwing an error
+			ipv6.NextHeader = IPProtocolIPv6HopByHop
+		}
+		err = ipv6.HopByHop.SerializeTo(b, opts)
+		if err != nil {
+			return err
+		}
+		payload = b.Bytes()
+		pLen = len(payload)
+		if opts.FixLengths && jumbo {
+			err := setIPv6PayloadJumboLength(payload)
+			if err != nil {
+				return err
+			}
+		}
+	}
+
+	if !jumbo && pLen > ipv6MaxPayloadLength {
+		return errors.New("Cannot fit payload into IPv6 header")
+	}
+	bytes, err := b.PrependBytes(40)
+	if err != nil {
+		return err
+	}
+	bytes[0] = (ipv6.Version << 4) | (ipv6.TrafficClass >> 4)
+	bytes[1] = (ipv6.TrafficClass << 4) | uint8(ipv6.FlowLabel>>16)
+	binary.BigEndian.PutUint16(bytes[2:], uint16(ipv6.FlowLabel))
+	if opts.FixLengths {
+		if jumbo {
+			ipv6.Length = 0
+		} else {
+			ipv6.Length = uint16(pLen)
+		}
+	}
+	binary.BigEndian.PutUint16(bytes[4:], ipv6.Length)
+	bytes[6] = byte(ipv6.NextHeader)
+	bytes[7] = byte(ipv6.HopLimit)
+	if err := ipv6.AddressTo16(); err != nil {
+		return err
+	}
+	copy(bytes[8:], ipv6.SrcIP)
+	copy(bytes[24:], ipv6.DstIP)
+	return nil
+}
+
+// DecodeFromBytes implementation according to gopacket.DecodingLayer
+func (ipv6 *IPv6) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+	if len(data) < 40 {
+		df.SetTruncated()
+		return fmt.Errorf("Invalid ip6 header. Length %d less than 40", len(data))
+	}
+	ipv6.Version = uint8(data[0]) >> 4
+	ipv6.TrafficClass = uint8((binary.BigEndian.Uint16(data[0:2]) >> 4) & 0x00FF)
+	ipv6.FlowLabel = binary.BigEndian.Uint32(data[0:4]) & 0x000FFFFF
+	ipv6.Length = binary.BigEndian.Uint16(data[4:6])
+	ipv6.NextHeader = IPProtocol(data[6])
+	ipv6.HopLimit = data[7]
+	ipv6.SrcIP = data[8:24]
+	ipv6.DstIP = data[24:40]
+	ipv6.HopByHop = nil
+	ipv6.BaseLayer = BaseLayer{data[:40], data[40:]}
+
+	// We treat a HopByHop IPv6 option as part of the IPv6 packet, since its
+	// options are crucial for understanding what's actually happening per packet.
+	if ipv6.NextHeader == IPProtocolIPv6HopByHop {
+		err := ipv6.hbh.DecodeFromBytes(ipv6.Payload, df)
+		if err != nil {
+			return err
+		}
+		ipv6.HopByHop = &ipv6.hbh
+		pEnd, jumbo, err := getIPv6HopByHopJumboLength(ipv6.HopByHop)
+		if err != nil {
+			return err
+		}
+		if jumbo && ipv6.Length == 0 {
+			pEnd := int(pEnd)
+			if pEnd > len(ipv6.Payload) {
+				df.SetTruncated()
+				pEnd = len(ipv6.Payload)
+			}
+			ipv6.Payload = ipv6.Payload[:pEnd]
+			return nil
+		} else if jumbo && ipv6.Length != 0 {
+			return errors.New("IPv6 has jumbo length and IPv6 length is not 0")
+		} else if !jumbo && ipv6.Length == 0 {
+			return errors.New("IPv6 length 0, but HopByHop header does not have jumbogram option")
+		} else {
+			ipv6.Payload = ipv6.Payload[ipv6.hbh.ActualLength:]
+		}
+	}
+
+	if ipv6.Length == 0 {
+		return fmt.Errorf("IPv6 length 0, but next header is %v, not HopByHop", ipv6.NextHeader)
+	}
+
+	pEnd := int(ipv6.Length)
+	if pEnd > len(ipv6.Payload) {
+		df.SetTruncated()
+		pEnd = len(ipv6.Payload)
+	}
+	ipv6.Payload = ipv6.Payload[:pEnd]
+
+	return nil
+}
+
+// CanDecode implementation according to gopacket.DecodingLayer
+func (ipv6 *IPv6) CanDecode() gopacket.LayerClass {
+	return LayerTypeIPv6
+}
+
+// NextLayerType implementation according to gopacket.DecodingLayer
+func (ipv6 *IPv6) NextLayerType() gopacket.LayerType {
+	if ipv6.HopByHop != nil {
+		return ipv6.HopByHop.NextHeader.LayerType()
+	}
+	return ipv6.NextHeader.LayerType()
+}
+
+func decodeIPv6(data []byte, p gopacket.PacketBuilder) error {
+	ip6 := &IPv6{}
+	err := ip6.DecodeFromBytes(data, p)
+	p.AddLayer(ip6)
+	p.SetNetworkLayer(ip6)
+	if ip6.HopByHop != nil {
+		p.AddLayer(ip6.HopByHop)
+	}
+	if err != nil {
+		return err
+	}
+	return p.NextDecoder(ip6.NextLayerType())
+}
+
+type ipv6HeaderTLVOption struct {
+	OptionType, OptionLength uint8
+	ActualLength             int
+	OptionData               []byte
+	OptionAlignment          [2]uint8 // Xn+Y = [2]uint8{X, Y}
+}
+
+func (h *ipv6HeaderTLVOption) serializeTo(data []byte, fixLengths bool, dryrun bool) int {
+	if fixLengths {
+		h.OptionLength = uint8(len(h.OptionData))
+	}
+	length := int(h.OptionLength) + 2
+	if !dryrun {
+		data[0] = h.OptionType
+		data[1] = h.OptionLength
+		copy(data[2:], h.OptionData)
+	}
+	return length
+}
+
+func decodeIPv6HeaderTLVOption(data []byte, df gopacket.DecodeFeedback) (h *ipv6HeaderTLVOption, _ error) {
+	if len(data) < 2 {
+		df.SetTruncated()
+		return nil, errors.New("IPv6 header option too small")
+	}
+	h = &ipv6HeaderTLVOption{}
+	if data[0] == 0 {
+		h.ActualLength = 1
+		return
+	}
+	h.OptionType = data[0]
+	h.OptionLength = data[1]
+	h.ActualLength = int(h.OptionLength) + 2
+	if len(data) < h.ActualLength {
+		df.SetTruncated()
+		return nil, errors.New("IPv6 header TLV option too small")
+	}
+	h.OptionData = data[2:h.ActualLength]
+	return
+}
+
+func serializeTLVOptionPadding(data []byte, padLength int) {
+	if padLength <= 0 {
+		return
+	}
+	if padLength == 1 {
+		data[0] = 0x0
+		return
+	}
+	tlvLength := uint8(padLength) - 2
+	data[0] = 0x1
+	data[1] = tlvLength
+	if tlvLength != 0 {
+		for k := range data[2:] {
+			data[k+2] = 0x0
+		}
+	}
+	return
+}
+
+// If buf is 'nil' do a serialize dry run
+func serializeIPv6HeaderTLVOptions(buf []byte, options []*ipv6HeaderTLVOption, fixLengths bool) int {
+	var l int
+
+	dryrun := buf == nil
+	length := 2
+	for _, opt := range options {
+		if fixLengths {
+			x := int(opt.OptionAlignment[0])
+			y := int(opt.OptionAlignment[1])
+			if x != 0 {
+				n := length / x
+				offset := x*n + y
+				if offset < length {
+					offset += x
+				}
+				if length != offset {
+					pad := offset - length
+					if !dryrun {
+						serializeTLVOptionPadding(buf[length-2:], pad)
+					}
+					length += pad
+				}
+			}
+		}
+		if dryrun {
+			l = opt.serializeTo(nil, fixLengths, true)
+		} else {
+			l = opt.serializeTo(buf[length-2:], fixLengths, false)
+		}
+		length += l
+	}
+	if fixLengths {
+		pad := length % 8
+		if pad != 0 {
+			if !dryrun {
+				serializeTLVOptionPadding(buf[length-2:], pad)
+			}
+			length += pad
+		}
+	}
+	return length - 2
+}
+
+type ipv6ExtensionBase struct {
+	BaseLayer
+	NextHeader   IPProtocol
+	HeaderLength uint8
+	ActualLength int
+}
+
+func decodeIPv6ExtensionBase(data []byte, df gopacket.DecodeFeedback) (i ipv6ExtensionBase, returnedErr error) {
+	if len(data) < 2 {
+		df.SetTruncated()
+		return ipv6ExtensionBase{}, fmt.Errorf("Invalid ip6-extension header. Length %d less than 2", len(data))
+	}
+	i.NextHeader = IPProtocol(data[0])
+	i.HeaderLength = data[1]
+	i.ActualLength = int(i.HeaderLength)*8 + 8
+	if len(data) < i.ActualLength {
+		return ipv6ExtensionBase{}, fmt.Errorf("Invalid ip6-extension header. Length %d less than specified length %d", len(data), i.ActualLength)
+	}
+	i.Contents = data[:i.ActualLength]
+	i.Payload = data[i.ActualLength:]
+	return
+}
+
+// IPv6ExtensionSkipper is a DecodingLayer which decodes and ignores v6
+// extensions.  You can use it with a DecodingLayerParser to handle IPv6 stacks
+// which may or may not have extensions.
+type IPv6ExtensionSkipper struct {
+	NextHeader IPProtocol
+	BaseLayer
+}
+
+// DecodeFromBytes implementation according to gopacket.DecodingLayer
+func (i *IPv6ExtensionSkipper) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+	extension, err := decodeIPv6ExtensionBase(data, df)
+	if err != nil {
+		return err
+	}
+	i.BaseLayer = BaseLayer{data[:extension.ActualLength], data[extension.ActualLength:]}
+	i.NextHeader = extension.NextHeader
+	return nil
+}
+
+// CanDecode implementation according to gopacket.DecodingLayer
+func (i *IPv6ExtensionSkipper) CanDecode() gopacket.LayerClass {
+	return LayerClassIPv6Extension
+}
+
+// NextLayerType implementation according to gopacket.DecodingLayer
+func (i *IPv6ExtensionSkipper) NextLayerType() gopacket.LayerType {
+	return i.NextHeader.LayerType()
+}
+
+// IPv6HopByHopOption is a TLV option present in an IPv6 hop-by-hop extension.
+type IPv6HopByHopOption ipv6HeaderTLVOption
+
+// IPv6HopByHop is the IPv6 hop-by-hop extension.
+type IPv6HopByHop struct {
+	ipv6ExtensionBase
+	Options []*IPv6HopByHopOption
+}
+
+// LayerType returns LayerTypeIPv6HopByHop.
+func (i *IPv6HopByHop) LayerType() gopacket.LayerType { return LayerTypeIPv6HopByHop }
+
+// SerializeTo implementation according to gopacket.SerializableLayer
+func (i *IPv6HopByHop) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	var bytes []byte
+	var err error
+
+	o := make([]*ipv6HeaderTLVOption, 0, len(i.Options))
+	for _, v := range i.Options {
+		o = append(o, (*ipv6HeaderTLVOption)(v))
+	}
+
+	l := serializeIPv6HeaderTLVOptions(nil, o, opts.FixLengths)
+	bytes, err = b.PrependBytes(l)
+	if err != nil {
+		return err
+	}
+	serializeIPv6HeaderTLVOptions(bytes, o, opts.FixLengths)
+
+	length := len(bytes) + 2
+	if length%8 != 0 {
+		return errors.New("IPv6HopByHop actual length must be multiple of 8")
+	}
+	bytes, err = b.PrependBytes(2)
+	if err != nil {
+		return err
+	}
+	bytes[0] = uint8(i.NextHeader)
+	if opts.FixLengths {
+		i.HeaderLength = uint8((length / 8) - 1)
+	}
+	bytes[1] = uint8(i.HeaderLength)
+	return nil
+}
+
+// DecodeFromBytes implementation according to gopacket.DecodingLayer
+func (i *IPv6HopByHop) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+	var err error
+	i.ipv6ExtensionBase, err = decodeIPv6ExtensionBase(data, df)
+	if err != nil {
+		return err
+	}
+	i.Options = i.Options[:0]
+	offset := 2
+	for offset < i.ActualLength {
+		opt, err := decodeIPv6HeaderTLVOption(data[offset:], df)
+		if err != nil {
+			return err
+		}
+		i.Options = append(i.Options, (*IPv6HopByHopOption)(opt))
+		offset += opt.ActualLength
+	}
+	return nil
+}
+
+func decodeIPv6HopByHop(data []byte, p gopacket.PacketBuilder) error {
+	i := &IPv6HopByHop{}
+	err := i.DecodeFromBytes(data, p)
+	p.AddLayer(i)
+	if err != nil {
+		return err
+	}
+	return p.NextDecoder(i.NextHeader)
+}
+
+// SetJumboLength adds the IPv6HopByHopOptionJumbogram with the given length
+func (o *IPv6HopByHopOption) SetJumboLength(len uint32) {
+	o.OptionType = IPv6HopByHopOptionJumbogram
+	o.OptionLength = 4
+	o.ActualLength = 6
+	if o.OptionData == nil {
+		o.OptionData = make([]byte, 4)
+	}
+	binary.BigEndian.PutUint32(o.OptionData, len)
+	o.OptionAlignment = [2]uint8{4, 2}
+}
+
+// IPv6Routing is the IPv6 routing extension.
+type IPv6Routing struct {
+	ipv6ExtensionBase
+	RoutingType  uint8
+	SegmentsLeft uint8
+	// This segment is supposed to be zero according to RFC2460, the second set of
+	// 4 bytes in the extension.
+	Reserved []byte
+	// SourceRoutingIPs is the set of IPv6 addresses requested for source routing,
+	// set only if RoutingType == 0.
+	SourceRoutingIPs []net.IP
+}
+
+// LayerType returns LayerTypeIPv6Routing.
+func (i *IPv6Routing) LayerType() gopacket.LayerType { return LayerTypeIPv6Routing }
+
+func decodeIPv6Routing(data []byte, p gopacket.PacketBuilder) error {
+	base, err := decodeIPv6ExtensionBase(data, p)
+	if err != nil {
+		return err
+	}
+	i := &IPv6Routing{
+		ipv6ExtensionBase: base,
+		RoutingType:       data[2],
+		SegmentsLeft:      data[3],
+		Reserved:          data[4:8],
+	}
+	switch i.RoutingType {
+	case 0: // Source routing
+		if (i.ActualLength-8)%16 != 0 {
+			return fmt.Errorf("Invalid IPv6 source routing, length of type 0 packet %d", i.ActualLength)
+		}
+		for d := i.Contents[8:]; len(d) >= 16; d = d[16:] {
+			i.SourceRoutingIPs = append(i.SourceRoutingIPs, net.IP(d[:16]))
+		}
+	default:
+		return fmt.Errorf("Unknown IPv6 routing header type %d", i.RoutingType)
+	}
+	p.AddLayer(i)
+	return p.NextDecoder(i.NextHeader)
+}
+
+// IPv6Fragment is the IPv6 fragment header, used for packet
+// fragmentation/defragmentation.
+type IPv6Fragment struct {
+	BaseLayer
+	NextHeader IPProtocol
+	// Reserved1 is bits [8-16), from least to most significant, 0-indexed
+	Reserved1      uint8
+	FragmentOffset uint16
+	// Reserved2 is bits [29-31), from least to most significant, 0-indexed
+	Reserved2      uint8
+	MoreFragments  bool
+	Identification uint32
+}
+
+// LayerType returns LayerTypeIPv6Fragment.
+func (i *IPv6Fragment) LayerType() gopacket.LayerType { return LayerTypeIPv6Fragment }
+
+func decodeIPv6Fragment(data []byte, p gopacket.PacketBuilder) error {
+	if len(data) < 8 {
+		p.SetTruncated()
+		return fmt.Errorf("Invalid ip6-fragment header. Length %d less than 8", len(data))
+	}
+	i := &IPv6Fragment{
+		BaseLayer:      BaseLayer{data[:8], data[8:]},
+		NextHeader:     IPProtocol(data[0]),
+		Reserved1:      data[1],
+		FragmentOffset: binary.BigEndian.Uint16(data[2:4]) >> 3,
+		Reserved2:      data[3] & 0x6 >> 1,
+		MoreFragments:  data[3]&0x1 != 0,
+		Identification: binary.BigEndian.Uint32(data[4:8]),
+	}
+	p.AddLayer(i)
+	return p.NextDecoder(gopacket.DecodeFragment)
+}
+
+// IPv6DestinationOption is a TLV option present in an IPv6 destination options extension.
+type IPv6DestinationOption ipv6HeaderTLVOption
+
+// IPv6Destination is the IPv6 destination options header.
+type IPv6Destination struct {
+	ipv6ExtensionBase
+	Options []*IPv6DestinationOption
+}
+
+// LayerType returns LayerTypeIPv6Destination.
+func (i *IPv6Destination) LayerType() gopacket.LayerType { return LayerTypeIPv6Destination }
+
+// DecodeFromBytes implementation according to gopacket.DecodingLayer
+func (i *IPv6Destination) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+	var err error
+	i.ipv6ExtensionBase, err = decodeIPv6ExtensionBase(data, df)
+	if err != nil {
+		return err
+	}
+	offset := 2
+	for offset < i.ActualLength {
+		opt, err := decodeIPv6HeaderTLVOption(data[offset:], df)
+		if err != nil {
+			return err
+		}
+		i.Options = append(i.Options, (*IPv6DestinationOption)(opt))
+		offset += opt.ActualLength
+	}
+	return nil
+}
+
+func decodeIPv6Destination(data []byte, p gopacket.PacketBuilder) error {
+	i := &IPv6Destination{}
+	err := i.DecodeFromBytes(data, p)
+	p.AddLayer(i)
+	if err != nil {
+		return err
+	}
+	return p.NextDecoder(i.NextHeader)
+}
+
+// SerializeTo writes the serialized form of this layer into the
+// SerializationBuffer, implementing gopacket.SerializableLayer.
+// See the docs for gopacket.SerializableLayer for more info.
+func (i *IPv6Destination) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	var bytes []byte
+	var err error
+
+	o := make([]*ipv6HeaderTLVOption, 0, len(i.Options))
+	for _, v := range i.Options {
+		o = append(o, (*ipv6HeaderTLVOption)(v))
+	}
+
+	l := serializeIPv6HeaderTLVOptions(nil, o, opts.FixLengths)
+	bytes, err = b.PrependBytes(l)
+	if err != nil {
+		return err
+	}
+	serializeIPv6HeaderTLVOptions(bytes, o, opts.FixLengths)
+
+	length := len(bytes) + 2
+	if length%8 != 0 {
+		return errors.New("IPv6Destination actual length must be multiple of 8")
+	}
+	bytes, err = b.PrependBytes(2)
+	if err != nil {
+		return err
+	}
+	bytes[0] = uint8(i.NextHeader)
+	if opts.FixLengths {
+		i.HeaderLength = uint8((length / 8) - 1)
+	}
+	bytes[1] = uint8(i.HeaderLength)
+	return nil
+}
+
+func checkIPv6Address(addr net.IP) error {
+	if len(addr) == net.IPv6len {
+		return nil
+	}
+	if len(addr) == net.IPv4len {
+		return errors.New("address is IPv4")
+	}
+	return fmt.Errorf("wrong length of %d bytes instead of %d", len(addr), net.IPv6len)
+}
+
+// AddressTo16 ensures IPv6.SrcIP and IPv6.DstIP are actually IPv6 addresses (i.e. 16 byte addresses)
+func (ipv6 *IPv6) AddressTo16() error {
+	if err := checkIPv6Address(ipv6.SrcIP); err != nil {
+		return fmt.Errorf("Invalid source IPv6 address (%s)", err)
+	}
+	if err := checkIPv6Address(ipv6.DstIP); err != nil {
+		return fmt.Errorf("Invalid destination IPv6 address (%s)", err)
+	}
+	return nil
+}

vendor/github.com/google/gopacket/layers/ipsec.go

@@ -0,0 +1,77 @@
+// Copyright 2012 Google, Inc. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+package layers
+
+import (
+	"encoding/binary"
+	"errors"
+	"github.com/google/gopacket"
+)
+
+// IPSecAH is the authentication header for IPv4/6 defined in
+// http://tools.ietf.org/html/rfc2402
+type IPSecAH struct {
+	// While the auth header can be used for both IPv4 and v6, its format is that of
+	// an IPv6 extension (NextHeader, PayloadLength, etc...), so we use ipv6ExtensionBase
+	// to build it.
+	ipv6ExtensionBase
+	Reserved           uint16
+	SPI, Seq           uint32
+	AuthenticationData []byte
+}
+
+// LayerType returns LayerTypeIPSecAH.
+func (i *IPSecAH) LayerType() gopacket.LayerType { return LayerTypeIPSecAH }
+
+func decodeIPSecAH(data []byte, p gopacket.PacketBuilder) error {
+	if len(data) < 12 {
+		p.SetTruncated()
+		return errors.New("IPSec AH packet less than 12 bytes")
+	}
+	i := &IPSecAH{
+		ipv6ExtensionBase: ipv6ExtensionBase{
+			NextHeader:   IPProtocol(data[0]),
+			HeaderLength: data[1],
+		},
+		Reserved: binary.BigEndian.Uint16(data[2:4]),
+		SPI:      binary.BigEndian.Uint32(data[4:8]),
+		Seq:      binary.BigEndian.Uint32(data[8:12]),
+	}
+	i.ActualLength = (int(i.HeaderLength) + 2) * 4
+	if len(data) < i.ActualLength {
+		p.SetTruncated()
+		return errors.New("Truncated AH packet < ActualLength")
+	}
+	i.AuthenticationData = data[12:i.ActualLength]
+	i.Contents = data[:i.ActualLength]
+	i.Payload = data[i.ActualLength:]
+	p.AddLayer(i)
+	return p.NextDecoder(i.NextHeader)
+}
+
+// IPSecESP is the encapsulating security payload defined in
+// http://tools.ietf.org/html/rfc2406
+type IPSecESP struct {
+	BaseLayer
+	SPI, Seq uint32
+	// Encrypted contains the encrypted set of bytes sent in an ESP
+	Encrypted []byte
+}
+
+// LayerType returns LayerTypeIPSecESP.
+func (i *IPSecESP) LayerType() gopacket.LayerType { return LayerTypeIPSecESP }
+
+func decodeIPSecESP(data []byte, p gopacket.PacketBuilder) error {
+	i := &IPSecESP{
+		BaseLayer: BaseLayer{data, nil},
+		SPI:       binary.BigEndian.Uint32(data[:4]),
+		Seq:       binary.BigEndian.Uint32(data[4:8]),
+		Encrypted: data[8:],
+	}
+	p.AddLayer(i)
+	return nil
+}

vendor/github.com/google/gopacket/layers/layertypes.go

@@ -0,0 +1,223 @@
+// Copyright 2012 Google, Inc. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+package layers
+
+import (
+	"github.com/google/gopacket"
+)
+
+var (
+	LayerTypeARP                          = gopacket.RegisterLayerType(10, gopacket.LayerTypeMetadata{Name: "ARP", Decoder: gopacket.DecodeFunc(decodeARP)})
+	LayerTypeCiscoDiscovery               = gopacket.RegisterLayerType(11, gopacket.LayerTypeMetadata{Name: "CiscoDiscovery", Decoder: gopacket.DecodeFunc(decodeCiscoDiscovery)})
+	LayerTypeEthernetCTP                  = gopacket.RegisterLayerType(12, gopacket.LayerTypeMetadata{Name: "EthernetCTP", Decoder: gopacket.DecodeFunc(decodeEthernetCTP)})
+	LayerTypeEthernetCTPForwardData       = gopacket.RegisterLayerType(13, gopacket.LayerTypeMetadata{Name: "EthernetCTPForwardData", Decoder: nil})
+	LayerTypeEthernetCTPReply             = gopacket.RegisterLayerType(14, gopacket.LayerTypeMetadata{Name: "EthernetCTPReply", Decoder: nil})
+	LayerTypeDot1Q                        = gopacket.RegisterLayerType(15, gopacket.LayerTypeMetadata{Name: "Dot1Q", Decoder: gopacket.DecodeFunc(decodeDot1Q)})
+	LayerTypeEtherIP                      = gopacket.RegisterLayerType(16, gopacket.LayerTypeMetadata{Name: "EtherIP", Decoder: gopacket.DecodeFunc(decodeEtherIP)})
+	LayerTypeEthernet                     = gopacket.RegisterLayerType(17, gopacket.LayerTypeMetadata{Name: "Ethernet", Decoder: gopacket.DecodeFunc(decodeEthernet)})
+	LayerTypeGRE                          = gopacket.RegisterLayerType(18, gopacket.LayerTypeMetadata{Name: "GRE", Decoder: gopacket.DecodeFunc(decodeGRE)})
+	LayerTypeICMPv4                       = gopacket.RegisterLayerType(19, gopacket.LayerTypeMetadata{Name: "ICMPv4", Decoder: gopacket.DecodeFunc(decodeICMPv4)})
+	LayerTypeIPv4                         = gopacket.RegisterLayerType(20, gopacket.LayerTypeMetadata{Name: "IPv4", Decoder: gopacket.DecodeFunc(decodeIPv4)})
+	LayerTypeIPv6                         = gopacket.RegisterLayerType(21, gopacket.LayerTypeMetadata{Name: "IPv6", Decoder: gopacket.DecodeFunc(decodeIPv6)})
+	LayerTypeLLC                          = gopacket.RegisterLayerType(22, gopacket.LayerTypeMetadata{Name: "LLC", Decoder: gopacket.DecodeFunc(decodeLLC)})
+	LayerTypeSNAP                         = gopacket.RegisterLayerType(23, gopacket.LayerTypeMetadata{Name: "SNAP", Decoder: gopacket.DecodeFunc(decodeSNAP)})
+	LayerTypeMPLS                         = gopacket.RegisterLayerType(24, gopacket.LayerTypeMetadata{Name: "MPLS", Decoder: gopacket.DecodeFunc(decodeMPLS)})
+	LayerTypePPP                          = gopacket.RegisterLayerType(25, gopacket.LayerTypeMetadata{Name: "PPP", Decoder: gopacket.DecodeFunc(decodePPP)})
+	LayerTypePPPoE                        = gopacket.RegisterLayerType(26, gopacket.LayerTypeMetadata{Name: "PPPoE", Decoder: gopacket.DecodeFunc(decodePPPoE)})
+	LayerTypeRUDP                         = gopacket.RegisterLayerType(27, gopacket.LayerTypeMetadata{Name: "RUDP", Decoder: gopacket.DecodeFunc(decodeRUDP)})
+	LayerTypeSCTP                         = gopacket.RegisterLayerType(28, gopacket.LayerTypeMetadata{Name: "SCTP", Decoder: gopacket.DecodeFunc(decodeSCTP)})
+	LayerTypeSCTPUnknownChunkType         = gopacket.RegisterLayerType(29, gopacket.LayerTypeMetadata{Name: "SCTPUnknownChunkType", Decoder: nil})
+	LayerTypeSCTPData                     = gopacket.RegisterLayerType(30, gopacket.LayerTypeMetadata{Name: "SCTPData", Decoder: nil})
+	LayerTypeSCTPInit                     = gopacket.RegisterLayerType(31, gopacket.LayerTypeMetadata{Name: "SCTPInit", Decoder: nil})
+	LayerTypeSCTPSack                     = gopacket.RegisterLayerType(32, gopacket.LayerTypeMetadata{Name: "SCTPSack", Decoder: nil})
+	LayerTypeSCTPHeartbeat                = gopacket.RegisterLayerType(33, gopacket.LayerTypeMetadata{Name: "SCTPHeartbeat", Decoder: nil})
+	LayerTypeSCTPError                    = gopacket.RegisterLayerType(34, gopacket.LayerTypeMetadata{Name: "SCTPError", Decoder: nil})
+	LayerTypeSCTPShutdown                 = gopacket.RegisterLayerType(35, gopacket.LayerTypeMetadata{Name: "SCTPShutdown", Decoder: nil})
+	LayerTypeSCTPShutdownAck              = gopacket.RegisterLayerType(36, gopacket.LayerTypeMetadata{Name: "SCTPShutdownAck", Decoder: nil})
+	LayerTypeSCTPCookieEcho               = gopacket.RegisterLayerType(37, gopacket.LayerTypeMetadata{Name: "SCTPCookieEcho", Decoder: nil})
+	LayerTypeSCTPEmptyLayer               = gopacket.RegisterLayerType(38, gopacket.LayerTypeMetadata{Name: "SCTPEmptyLayer", Decoder: nil})
+	LayerTypeSCTPInitAck                  = gopacket.RegisterLayerType(39, gopacket.LayerTypeMetadata{Name: "SCTPInitAck", Decoder: nil})
+	LayerTypeSCTPHeartbeatAck             = gopacket.RegisterLayerType(40, gopacket.LayerTypeMetadata{Name: "SCTPHeartbeatAck", Decoder: nil})
+	LayerTypeSCTPAbort                    = gopacket.RegisterLayerType(41, gopacket.LayerTypeMetadata{Name: "SCTPAbort", Decoder: nil})
+	LayerTypeSCTPShutdownComplete         = gopacket.RegisterLayerType(42, gopacket.LayerTypeMetadata{Name: "SCTPShutdownComplete", Decoder: nil})
+	LayerTypeSCTPCookieAck                = gopacket.RegisterLayerType(43, gopacket.LayerTypeMetadata{Name: "SCTPCookieAck", Decoder: nil})
+	LayerTypeTCP                          = gopacket.RegisterLayerType(44, gopacket.LayerTypeMetadata{Name: "TCP", Decoder: gopacket.DecodeFunc(decodeTCP)})
+	LayerTypeUDP                          = gopacket.RegisterLayerType(45, gopacket.LayerTypeMetadata{Name: "UDP", Decoder: gopacket.DecodeFunc(decodeUDP)})
+	LayerTypeIPv6HopByHop                 = gopacket.RegisterLayerType(46, gopacket.LayerTypeMetadata{Name: "IPv6HopByHop", Decoder: gopacket.DecodeFunc(decodeIPv6HopByHop)})
+	LayerTypeIPv6Routing                  = gopacket.RegisterLayerType(47, gopacket.LayerTypeMetadata{Name: "IPv6Routing", Decoder: gopacket.DecodeFunc(decodeIPv6Routing)})
+	LayerTypeIPv6Fragment                 = gopacket.RegisterLayerType(48, gopacket.LayerTypeMetadata{Name: "IPv6Fragment", Decoder: gopacket.DecodeFunc(decodeIPv6Fragment)})
+	LayerTypeIPv6Destination              = gopacket.RegisterLayerType(49, gopacket.LayerTypeMetadata{Name: "IPv6Destination", Decoder: gopacket.DecodeFunc(decodeIPv6Destination)})
+	LayerTypeIPSecAH                      = gopacket.RegisterLayerType(50, gopacket.LayerTypeMetadata{Name: "IPSecAH", Decoder: gopacket.DecodeFunc(decodeIPSecAH)})
+	LayerTypeIPSecESP                     = gopacket.RegisterLayerType(51, gopacket.LayerTypeMetadata{Name: "IPSecESP", Decoder: gopacket.DecodeFunc(decodeIPSecESP)})
+	LayerTypeUDPLite                      = gopacket.RegisterLayerType(52, gopacket.LayerTypeMetadata{Name: "UDPLite", Decoder: gopacket.DecodeFunc(decodeUDPLite)})
+	LayerTypeFDDI                         = gopacket.RegisterLayerType(53, gopacket.LayerTypeMetadata{Name: "FDDI", Decoder: gopacket.DecodeFunc(decodeFDDI)})
+	LayerTypeLoopback                     = gopacket.RegisterLayerType(54, gopacket.LayerTypeMetadata{Name: "Loopback", Decoder: gopacket.DecodeFunc(decodeLoopback)})
+	LayerTypeEAP                          = gopacket.RegisterLayerType(55, gopacket.LayerTypeMetadata{Name: "EAP", Decoder: gopacket.DecodeFunc(decodeEAP)})
+	LayerTypeEAPOL                        = gopacket.RegisterLayerType(56, gopacket.LayerTypeMetadata{Name: "EAPOL", Decoder: gopacket.DecodeFunc(decodeEAPOL)})
+	LayerTypeICMPv6                       = gopacket.RegisterLayerType(57, gopacket.LayerTypeMetadata{Name: "ICMPv6", Decoder: gopacket.DecodeFunc(decodeICMPv6)})
+	LayerTypeLinkLayerDiscovery           = gopacket.RegisterLayerType(58, gopacket.LayerTypeMetadata{Name: "LinkLayerDiscovery", Decoder: gopacket.DecodeFunc(decodeLinkLayerDiscovery)})
+	LayerTypeCiscoDiscoveryInfo           = gopacket.RegisterLayerType(59, gopacket.LayerTypeMetadata{Name: "CiscoDiscoveryInfo", Decoder: gopacket.DecodeFunc(decodeCiscoDiscoveryInfo)})
+	LayerTypeLinkLayerDiscoveryInfo       = gopacket.RegisterLayerType(60, gopacket.LayerTypeMetadata{Name: "LinkLayerDiscoveryInfo", Decoder: nil})
+	LayerTypeNortelDiscovery              = gopacket.RegisterLayerType(61, gopacket.LayerTypeMetadata{Name: "NortelDiscovery", Decoder: gopacket.DecodeFunc(decodeNortelDiscovery)})
+	LayerTypeIGMP                         = gopacket.RegisterLayerType(62, gopacket.LayerTypeMetadata{Name: "IGMP", Decoder: gopacket.DecodeFunc(decodeIGMP)})
+	LayerTypePFLog                        = gopacket.RegisterLayerType(63, gopacket.LayerTypeMetadata{Name: "PFLog", Decoder: gopacket.DecodeFunc(decodePFLog)})
+	LayerTypeRadioTap                     = gopacket.RegisterLayerType(64, gopacket.LayerTypeMetadata{Name: "RadioTap", Decoder: gopacket.DecodeFunc(decodeRadioTap)})
+	LayerTypeDot11                        = gopacket.RegisterLayerType(65, gopacket.LayerTypeMetadata{Name: "Dot11", Decoder: gopacket.DecodeFunc(decodeDot11)})
+	LayerTypeDot11Ctrl                    = gopacket.RegisterLayerType(66, gopacket.LayerTypeMetadata{Name: "Dot11Ctrl", Decoder: gopacket.DecodeFunc(decodeDot11Ctrl)})
+	LayerTypeDot11Data                    = gopacket.RegisterLayerType(67, gopacket.LayerTypeMetadata{Name: "Dot11Data", Decoder: gopacket.DecodeFunc(decodeDot11Data)})
+	LayerTypeDot11DataCFAck               = gopacket.RegisterLayerType(68, gopacket.LayerTypeMetadata{Name: "Dot11DataCFAck", Decoder: gopacket.DecodeFunc(decodeDot11DataCFAck)})
+	LayerTypeDot11DataCFPoll              = gopacket.RegisterLayerType(69, gopacket.LayerTypeMetadata{Name: "Dot11DataCFPoll", Decoder: gopacket.DecodeFunc(decodeDot11DataCFPoll)})
+	LayerTypeDot11DataCFAckPoll           = gopacket.RegisterLayerType(70, gopacket.LayerTypeMetadata{Name: "Dot11DataCFAckPoll", Decoder: gopacket.DecodeFunc(decodeDot11DataCFAckPoll)})
+	LayerTypeDot11DataNull                = gopacket.RegisterLayerType(71, gopacket.LayerTypeMetadata{Name: "Dot11DataNull", Decoder: gopacket.DecodeFunc(decodeDot11DataNull)})
+	LayerTypeDot11DataCFAckNoData         = gopacket.RegisterLayerType(72, gopacket.LayerTypeMetadata{Name: "Dot11DataCFAck", Decoder: gopacket.DecodeFunc(decodeDot11DataCFAck)})
+	LayerTypeDot11DataCFPollNoData        = gopacket.RegisterLayerType(73, gopacket.LayerTypeMetadata{Name: "Dot11DataCFPoll", Decoder: gopacket.DecodeFunc(decodeDot11DataCFPoll)})
+	LayerTypeDot11DataCFAckPollNoData     = gopacket.RegisterLayerType(74, gopacket.LayerTypeMetadata{Name: "Dot11DataCFAckPoll", Decoder: gopacket.DecodeFunc(decodeDot11DataCFAckPoll)})
+	LayerTypeDot11DataQOSData             = gopacket.RegisterLayerType(75, gopacket.LayerTypeMetadata{Name: "Dot11DataQOSData", Decoder: gopacket.DecodeFunc(decodeDot11DataQOSData)})
+	LayerTypeDot11DataQOSDataCFAck        = gopacket.RegisterLayerType(76, gopacket.LayerTypeMetadata{Name: "Dot11DataQOSDataCFAck", Decoder: gopacket.DecodeFunc(decodeDot11DataQOSDataCFAck)})
+	LayerTypeDot11DataQOSDataCFPoll       = gopacket.RegisterLayerType(77, gopacket.LayerTypeMetadata{Name: "Dot11DataQOSDataCFPoll", Decoder: gopacket.DecodeFunc(decodeDot11DataQOSDataCFPoll)})
+	LayerTypeDot11DataQOSDataCFAckPoll    = gopacket.RegisterLayerType(78, gopacket.LayerTypeMetadata{Name: "Dot11DataQOSDataCFAckPoll", Decoder: gopacket.DecodeFunc(decodeDot11DataQOSDataCFAckPoll)})
+	LayerTypeDot11DataQOSNull             = gopacket.RegisterLayerType(79, gopacket.LayerTypeMetadata{Name: "Dot11DataQOSNull", Decoder: gopacket.DecodeFunc(decodeDot11DataQOSNull)})
+	LayerTypeDot11DataQOSCFPollNoData     = gopacket.RegisterLayerType(80, gopacket.LayerTypeMetadata{Name: "Dot11DataQOSCFPoll", Decoder: gopacket.DecodeFunc(decodeDot11DataQOSCFPollNoData)})
+	LayerTypeDot11DataQOSCFAckPollNoData  = gopacket.RegisterLayerType(81, gopacket.LayerTypeMetadata{Name: "Dot11DataQOSCFAckPoll", Decoder: gopacket.DecodeFunc(decodeDot11DataQOSCFAckPollNoData)})
+	LayerTypeDot11InformationElement      = gopacket.RegisterLayerType(82, gopacket.LayerTypeMetadata{Name: "Dot11InformationElement", Decoder: gopacket.DecodeFunc(decodeDot11InformationElement)})
+	LayerTypeDot11CtrlCTS                 = gopacket.RegisterLayerType(83, gopacket.LayerTypeMetadata{Name: "Dot11CtrlCTS", Decoder: gopacket.DecodeFunc(decodeDot11CtrlCTS)})
+	LayerTypeDot11CtrlRTS                 = gopacket.RegisterLayerType(84, gopacket.LayerTypeMetadata{Name: "Dot11CtrlRTS", Decoder: gopacket.DecodeFunc(decodeDot11CtrlRTS)})
+	LayerTypeDot11CtrlBlockAckReq         = gopacket.RegisterLayerType(85, gopacket.LayerTypeMetadata{Name: "Dot11CtrlBlockAckReq", Decoder: gopacket.DecodeFunc(decodeDot11CtrlBlockAckReq)})
+	LayerTypeDot11CtrlBlockAck            = gopacket.RegisterLayerType(86, gopacket.LayerTypeMetadata{Name: "Dot11CtrlBlockAck", Decoder: gopacket.DecodeFunc(decodeDot11CtrlBlockAck)})
+	LayerTypeDot11CtrlPowersavePoll       = gopacket.RegisterLayerType(87, gopacket.LayerTypeMetadata{Name: "Dot11CtrlPowersavePoll", Decoder: gopacket.DecodeFunc(decodeDot11CtrlPowersavePoll)})
+	LayerTypeDot11CtrlAck                 = gopacket.RegisterLayerType(88, gopacket.LayerTypeMetadata{Name: "Dot11CtrlAck", Decoder: gopacket.DecodeFunc(decodeDot11CtrlAck)})
+	LayerTypeDot11CtrlCFEnd               = gopacket.RegisterLayerType(89, gopacket.LayerTypeMetadata{Name: "Dot11CtrlCFEnd", Decoder: gopacket.DecodeFunc(decodeDot11CtrlCFEnd)})
+	LayerTypeDot11CtrlCFEndAck            = gopacket.RegisterLayerType(90, gopacket.LayerTypeMetadata{Name: "Dot11CtrlCFEndAck", Decoder: gopacket.DecodeFunc(decodeDot11CtrlCFEndAck)})
+	LayerTypeDot11MgmtAssociationReq      = gopacket.RegisterLayerType(91, gopacket.LayerTypeMetadata{Name: "Dot11MgmtAssociationReq", Decoder: gopacket.DecodeFunc(decodeDot11MgmtAssociationReq)})
+	LayerTypeDot11MgmtAssociationResp     = gopacket.RegisterLayerType(92, gopacket.LayerTypeMetadata{Name: "Dot11MgmtAssociationResp", Decoder: gopacket.DecodeFunc(decodeDot11MgmtAssociationResp)})
+	LayerTypeDot11MgmtReassociationReq    = gopacket.RegisterLayerType(93, gopacket.LayerTypeMetadata{Name: "Dot11MgmtReassociationReq", Decoder: gopacket.DecodeFunc(decodeDot11MgmtReassociationReq)})
+	LayerTypeDot11MgmtReassociationResp   = gopacket.RegisterLayerType(94, gopacket.LayerTypeMetadata{Name: "Dot11MgmtReassociationResp", Decoder: gopacket.DecodeFunc(decodeDot11MgmtReassociationResp)})
+	LayerTypeDot11MgmtProbeReq            = gopacket.RegisterLayerType(95, gopacket.LayerTypeMetadata{Name: "Dot11MgmtProbeReq", Decoder: gopacket.DecodeFunc(decodeDot11MgmtProbeReq)})
+	LayerTypeDot11MgmtProbeResp           = gopacket.RegisterLayerType(96, gopacket.LayerTypeMetadata{Name: "Dot11MgmtProbeResp", Decoder: gopacket.DecodeFunc(decodeDot11MgmtProbeResp)})
+	LayerTypeDot11MgmtMeasurementPilot    = gopacket.RegisterLayerType(97, gopacket.LayerTypeMetadata{Name: "Dot11MgmtMeasurementPilot", Decoder: gopacket.DecodeFunc(decodeDot11MgmtMeasurementPilot)})
+	LayerTypeDot11MgmtBeacon              = gopacket.RegisterLayerType(98, gopacket.LayerTypeMetadata{Name: "Dot11MgmtBeacon", Decoder: gopacket.DecodeFunc(decodeDot11MgmtBeacon)})
+	LayerTypeDot11MgmtATIM                = gopacket.RegisterLayerType(99, gopacket.LayerTypeMetadata{Name: "Dot11MgmtATIM", Decoder: gopacket.DecodeFunc(decodeDot11MgmtATIM)})
+	LayerTypeDot11MgmtDisassociation      = gopacket.RegisterLayerType(100, gopacket.LayerTypeMetadata{Name: "Dot11MgmtDisassociation", Decoder: gopacket.DecodeFunc(decodeDot11MgmtDisassociation)})
+	LayerTypeDot11MgmtAuthentication      = gopacket.RegisterLayerType(101, gopacket.LayerTypeMetadata{Name: "Dot11MgmtAuthentication", Decoder: gopacket.DecodeFunc(decodeDot11MgmtAuthentication)})
+	LayerTypeDot11MgmtDeauthentication    = gopacket.RegisterLayerType(102, gopacket.LayerTypeMetadata{Name: "Dot11MgmtDeauthentication", Decoder: gopacket.DecodeFunc(decodeDot11MgmtDeauthentication)})
+	LayerTypeDot11MgmtAction              = gopacket.RegisterLayerType(103, gopacket.LayerTypeMetadata{Name: "Dot11MgmtAction", Decoder: gopacket.DecodeFunc(decodeDot11MgmtAction)})
+	LayerTypeDot11MgmtActionNoAck         = gopacket.RegisterLayerType(104, gopacket.LayerTypeMetadata{Name: "Dot11MgmtActionNoAck", Decoder: gopacket.DecodeFunc(decodeDot11MgmtActionNoAck)})
+	LayerTypeDot11MgmtArubaWLAN           = gopacket.RegisterLayerType(105, gopacket.LayerTypeMetadata{Name: "Dot11MgmtArubaWLAN", Decoder: gopacket.DecodeFunc(decodeDot11MgmtArubaWLAN)})
+	LayerTypeDot11WEP                     = gopacket.RegisterLayerType(106, gopacket.LayerTypeMetadata{Name: "Dot11WEP", Decoder: gopacket.DecodeFunc(decodeDot11WEP)})
+	LayerTypeDNS                          = gopacket.RegisterLayerType(107, gopacket.LayerTypeMetadata{Name: "DNS", Decoder: gopacket.DecodeFunc(decodeDNS)})
+	LayerTypeUSB                          = gopacket.RegisterLayerType(108, gopacket.LayerTypeMetadata{Name: "USB", Decoder: gopacket.DecodeFunc(decodeUSB)})
+	LayerTypeUSBRequestBlockSetup         = gopacket.RegisterLayerType(109, gopacket.LayerTypeMetadata{Name: "USBRequestBlockSetup", Decoder: gopacket.DecodeFunc(decodeUSBRequestBlockSetup)})
+	LayerTypeUSBControl                   = gopacket.RegisterLayerType(110, gopacket.LayerTypeMetadata{Name: "USBControl", Decoder: gopacket.DecodeFunc(decodeUSBControl)})
+	LayerTypeUSBInterrupt                 = gopacket.RegisterLayerType(111, gopacket.LayerTypeMetadata{Name: "USBInterrupt", Decoder: gopacket.DecodeFunc(decodeUSBInterrupt)})
+	LayerTypeUSBBulk                      = gopacket.RegisterLayerType(112, gopacket.LayerTypeMetadata{Name: "USBBulk", Decoder: gopacket.DecodeFunc(decodeUSBBulk)})
+	LayerTypeLinuxSLL                     = gopacket.RegisterLayerType(113, gopacket.LayerTypeMetadata{Name: "Linux SLL", Decoder: gopacket.DecodeFunc(decodeLinuxSLL)})
+	LayerTypeSFlow                        = gopacket.RegisterLayerType(114, gopacket.LayerTypeMetadata{Name: "SFlow", Decoder: gopacket.DecodeFunc(decodeSFlow)})
+	LayerTypePrismHeader                  = gopacket.RegisterLayerType(115, gopacket.LayerTypeMetadata{Name: "Prism monitor mode header", Decoder: gopacket.DecodeFunc(decodePrismHeader)})
+	LayerTypeVXLAN                        = gopacket.RegisterLayerType(116, gopacket.LayerTypeMetadata{Name: "VXLAN", Decoder: gopacket.DecodeFunc(decodeVXLAN)})
+	LayerTypeNTP                          = gopacket.RegisterLayerType(117, gopacket.LayerTypeMetadata{Name: "NTP", Decoder: gopacket.DecodeFunc(decodeNTP)})
+	LayerTypeDHCPv4                       = gopacket.RegisterLayerType(118, gopacket.LayerTypeMetadata{Name: "DHCPv4", Decoder: gopacket.DecodeFunc(decodeDHCPv4)})
+	LayerTypeVRRP                         = gopacket.RegisterLayerType(119, gopacket.LayerTypeMetadata{Name: "VRRP", Decoder: gopacket.DecodeFunc(decodeVRRP)})
+	LayerTypeGeneve                       = gopacket.RegisterLayerType(120, gopacket.LayerTypeMetadata{Name: "Geneve", Decoder: gopacket.DecodeFunc(decodeGeneve)})
+	LayerTypeSTP                          = gopacket.RegisterLayerType(121, gopacket.LayerTypeMetadata{Name: "STP", Decoder: gopacket.DecodeFunc(decodeSTP)})
+	LayerTypeBFD                          = gopacket.RegisterLayerType(122, gopacket.LayerTypeMetadata{Name: "BFD", Decoder: gopacket.DecodeFunc(decodeBFD)})
+	LayerTypeOSPF                         = gopacket.RegisterLayerType(123, gopacket.LayerTypeMetadata{Name: "OSPF", Decoder: gopacket.DecodeFunc(decodeOSPF)})
+	LayerTypeICMPv6RouterSolicitation     = gopacket.RegisterLayerType(124, gopacket.LayerTypeMetadata{Name: "ICMPv6RouterSolicitation", Decoder: gopacket.DecodeFunc(decodeICMPv6RouterSolicitation)})
+	LayerTypeICMPv6RouterAdvertisement    = gopacket.RegisterLayerType(125, gopacket.LayerTypeMetadata{Name: "ICMPv6RouterAdvertisement", Decoder: gopacket.DecodeFunc(decodeICMPv6RouterAdvertisement)})
+	LayerTypeICMPv6NeighborSolicitation   = gopacket.RegisterLayerType(126, gopacket.LayerTypeMetadata{Name: "ICMPv6NeighborSolicitation", Decoder: gopacket.DecodeFunc(decodeICMPv6NeighborSolicitation)})
+	LayerTypeICMPv6NeighborAdvertisement  = gopacket.RegisterLayerType(127, gopacket.LayerTypeMetadata{Name: "ICMPv6NeighborAdvertisement", Decoder: gopacket.DecodeFunc(decodeICMPv6NeighborAdvertisement)})
+	LayerTypeICMPv6Redirect               = gopacket.RegisterLayerType(128, gopacket.LayerTypeMetadata{Name: "ICMPv6Redirect", Decoder: gopacket.DecodeFunc(decodeICMPv6Redirect)})
+	LayerTypeGTPv1U                       = gopacket.RegisterLayerType(129, gopacket.LayerTypeMetadata{Name: "GTPv1U", Decoder: gopacket.DecodeFunc(decodeGTPv1u)})
+	LayerTypeEAPOLKey                     = gopacket.RegisterLayerType(130, gopacket.LayerTypeMetadata{Name: "EAPOLKey", Decoder: gopacket.DecodeFunc(decodeEAPOLKey)})
+	LayerTypeLCM                          = gopacket.RegisterLayerType(131, gopacket.LayerTypeMetadata{Name: "LCM", Decoder: gopacket.DecodeFunc(decodeLCM)})
+	LayerTypeICMPv6Echo                   = gopacket.RegisterLayerType(132, gopacket.LayerTypeMetadata{Name: "ICMPv6Echo", Decoder: gopacket.DecodeFunc(decodeICMPv6Echo)})
+	LayerTypeSIP                          = gopacket.RegisterLayerType(133, gopacket.LayerTypeMetadata{Name: "SIP", Decoder: gopacket.DecodeFunc(decodeSIP)})
+	LayerTypeDHCPv6                       = gopacket.RegisterLayerType(134, gopacket.LayerTypeMetadata{Name: "DHCPv6", Decoder: gopacket.DecodeFunc(decodeDHCPv6)})
+	LayerTypeMLDv1MulticastListenerReport = gopacket.RegisterLayerType(135, gopacket.LayerTypeMetadata{Name: "MLDv1MulticastListenerReport", Decoder: gopacket.DecodeFunc(decodeMLDv1MulticastListenerReport)})
+	LayerTypeMLDv1MulticastListenerDone   = gopacket.RegisterLayerType(136, gopacket.LayerTypeMetadata{Name: "MLDv1MulticastListenerDone", Decoder: gopacket.DecodeFunc(decodeMLDv1MulticastListenerDone)})
+	LayerTypeMLDv1MulticastListenerQuery  = gopacket.RegisterLayerType(137, gopacket.LayerTypeMetadata{Name: "MLDv1MulticastListenerQuery", Decoder: gopacket.DecodeFunc(decodeMLDv1MulticastListenerQuery)})
+	LayerTypeMLDv2MulticastListenerReport = gopacket.RegisterLayerType(138, gopacket.LayerTypeMetadata{Name: "MLDv2MulticastListenerReport", Decoder: gopacket.DecodeFunc(decodeMLDv2MulticastListenerReport)})
+	LayerTypeMLDv2MulticastListenerQuery  = gopacket.RegisterLayerType(139, gopacket.LayerTypeMetadata{Name: "MLDv2MulticastListenerQuery", Decoder: gopacket.DecodeFunc(decodeMLDv2MulticastListenerQuery)})
+	LayerTypeTLS                          = gopacket.RegisterLayerType(140, gopacket.LayerTypeMetadata{Name: "TLS", Decoder: gopacket.DecodeFunc(decodeTLS)})
+	LayerTypeModbusTCP                    = gopacket.RegisterLayerType(141, gopacket.LayerTypeMetadata{Name: "ModbusTCP", Decoder: gopacket.DecodeFunc(decodeModbusTCP)})
+	LayerTypeRMCP                         = gopacket.RegisterLayerType(142, gopacket.LayerTypeMetadata{Name: "RMCP", Decoder: gopacket.DecodeFunc(decodeRMCP)})
+	LayerTypeASF                          = gopacket.RegisterLayerType(143, gopacket.LayerTypeMetadata{Name: "ASF", Decoder: gopacket.DecodeFunc(decodeASF)})
+	LayerTypeASFPresencePong              = gopacket.RegisterLayerType(144, gopacket.LayerTypeMetadata{Name: "ASFPresencePong", Decoder: gopacket.DecodeFunc(decodeASFPresencePong)})
+	LayerTypeERSPANII                     = gopacket.RegisterLayerType(145, gopacket.LayerTypeMetadata{Name: "ERSPAN Type II", Decoder: gopacket.DecodeFunc(decodeERSPANII)})
+	LayerTypeRADIUS                       = gopacket.RegisterLayerType(146, gopacket.LayerTypeMetadata{Name: "RADIUS", Decoder: gopacket.DecodeFunc(decodeRADIUS)})
+)
+
+var (
+	// LayerClassIPNetwork contains TCP/IP network layer types.
+	LayerClassIPNetwork = gopacket.NewLayerClass([]gopacket.LayerType{
+		LayerTypeIPv4,
+		LayerTypeIPv6,
+	})
+	// LayerClassIPTransport contains TCP/IP transport layer types.
+	LayerClassIPTransport = gopacket.NewLayerClass([]gopacket.LayerType{
+		LayerTypeTCP,
+		LayerTypeUDP,
+		LayerTypeSCTP,
+	})
+	// LayerClassIPControl contains TCP/IP control protocols.
+	LayerClassIPControl = gopacket.NewLayerClass([]gopacket.LayerType{
+		LayerTypeICMPv4,
+		LayerTypeICMPv6,
+	})
+	// LayerClassSCTPChunk contains SCTP chunk types (not the top-level SCTP
+	// layer).
+	LayerClassSCTPChunk = gopacket.NewLayerClass([]gopacket.LayerType{
+		LayerTypeSCTPUnknownChunkType,
+		LayerTypeSCTPData,
+		LayerTypeSCTPInit,
+		LayerTypeSCTPSack,
+		LayerTypeSCTPHeartbeat,
+		LayerTypeSCTPError,
+		LayerTypeSCTPShutdown,
+		LayerTypeSCTPShutdownAck,
+		LayerTypeSCTPCookieEcho,
+		LayerTypeSCTPEmptyLayer,
+		LayerTypeSCTPInitAck,
+		LayerTypeSCTPHeartbeatAck,
+		LayerTypeSCTPAbort,
+		LayerTypeSCTPShutdownComplete,
+		LayerTypeSCTPCookieAck,
+	})
+	// LayerClassIPv6Extension contains IPv6 extension headers.
+	LayerClassIPv6Extension = gopacket.NewLayerClass([]gopacket.LayerType{
+		LayerTypeIPv6HopByHop,
+		LayerTypeIPv6Routing,
+		LayerTypeIPv6Fragment,
+		LayerTypeIPv6Destination,
+	})
+	LayerClassIPSec = gopacket.NewLayerClass([]gopacket.LayerType{
+		LayerTypeIPSecAH,
+		LayerTypeIPSecESP,
+	})
+	// LayerClassICMPv6NDP contains ICMPv6 neighbor discovery protocol
+	// messages.
+	LayerClassICMPv6NDP = gopacket.NewLayerClass([]gopacket.LayerType{
+		LayerTypeICMPv6RouterSolicitation,
+		LayerTypeICMPv6RouterAdvertisement,
+		LayerTypeICMPv6NeighborSolicitation,
+		LayerTypeICMPv6NeighborAdvertisement,
+		LayerTypeICMPv6Redirect,
+	})
+	// LayerClassMLDv1 contains multicast listener discovery protocol
+	LayerClassMLDv1 = gopacket.NewLayerClass([]gopacket.LayerType{
+		LayerTypeMLDv1MulticastListenerQuery,
+		LayerTypeMLDv1MulticastListenerReport,
+		LayerTypeMLDv1MulticastListenerDone,
+	})
+	// LayerClassMLDv2 contains multicast listener discovery protocol v2
+	LayerClassMLDv2 = gopacket.NewLayerClass([]gopacket.LayerType{
+		LayerTypeMLDv1MulticastListenerReport,
+		LayerTypeMLDv1MulticastListenerDone,
+		LayerTypeMLDv2MulticastListenerReport,
+		LayerTypeMLDv1MulticastListenerQuery,
+		LayerTypeMLDv2MulticastListenerQuery,
+	})
+)

vendor/github.com/google/gopacket/layers/lcm.go

@@ -0,0 +1,218 @@
+// Copyright 2018 Google, Inc. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+package layers
+
+import (
+	"encoding/binary"
+	"errors"
+	"fmt"
+
+	"github.com/google/gopacket"
+)
+
+const (
+	// LCMShortHeaderMagic is the LCM small message header magic number
+	LCMShortHeaderMagic uint32 = 0x4c433032
+	// LCMFragmentedHeaderMagic is the LCM fragmented message header magic number
+	LCMFragmentedHeaderMagic uint32 = 0x4c433033
+)
+
+// LCM (Lightweight Communications and Marshalling) is a set of libraries and
+// tools for message passing and data marshalling, targeted at real-time systems
+// where high-bandwidth and low latency are critical. It provides a
+// publish/subscribe message passing model and automatic
+// marshalling/unmarshalling code generation with bindings for applications in a
+// variety of programming languages.
+//
+// References
+//   https://lcm-proj.github.io/
+//   https://github.com/lcm-proj/lcm
+type LCM struct {
+	// Common (short & fragmented header) fields
+	Magic          uint32
+	SequenceNumber uint32
+	// Fragmented header only fields
+	PayloadSize    uint32
+	FragmentOffset uint32
+	FragmentNumber uint16
+	TotalFragments uint16
+	// Common field
+	ChannelName string
+	// Gopacket helper fields
+	Fragmented  bool
+	fingerprint LCMFingerprint
+	contents    []byte
+	payload     []byte
+}
+
+// LCMFingerprint is the type of a LCM fingerprint.
+type LCMFingerprint uint64
+
+var (
+	// lcmLayerTypes contains a map of all LCM fingerprints that we support and
+	// their LayerType
+	lcmLayerTypes  = map[LCMFingerprint]gopacket.LayerType{}
+	layerTypeIndex = 1001
+)
+
+// RegisterLCMLayerType allows users to register decoders for the underlying
+// LCM payload. This is done based on the fingerprint that every LCM message
+// contains and which identifies it uniquely. If num is not the zero value it
+// will be used when registering with RegisterLayerType towards gopacket,
+// otherwise an incremental value starting from 1001 will be used.
+func RegisterLCMLayerType(num int, name string, fingerprint LCMFingerprint,
+	decoder gopacket.Decoder) gopacket.LayerType {
+	metadata := gopacket.LayerTypeMetadata{Name: name, Decoder: decoder}
+
+	if num == 0 {
+		num = layerTypeIndex
+		layerTypeIndex++
+	}
+
+	lcmLayerTypes[fingerprint] = gopacket.RegisterLayerType(num, metadata)
+
+	return lcmLayerTypes[fingerprint]
+}
+
+// SupportedLCMFingerprints returns a slice of all LCM fingerprints that has
+// been registered so far.
+func SupportedLCMFingerprints() []LCMFingerprint {
+	fingerprints := make([]LCMFingerprint, 0, len(lcmLayerTypes))
+	for fp := range lcmLayerTypes {
+		fingerprints = append(fingerprints, fp)
+	}
+	return fingerprints
+}
+
+// GetLCMLayerType returns the underlying LCM message's LayerType.
+// This LayerType has to be registered by using RegisterLCMLayerType.
+func GetLCMLayerType(fingerprint LCMFingerprint) gopacket.LayerType {
+	layerType, ok := lcmLayerTypes[fingerprint]
+	if !ok {
+		return gopacket.LayerTypePayload
+	}
+
+	return layerType
+}
+
+func decodeLCM(data []byte, p gopacket.PacketBuilder) error {
+	lcm := &LCM{}
+
+	err := lcm.DecodeFromBytes(data, p)
+	if err != nil {
+		return err
+	}
+
+	p.AddLayer(lcm)
+	p.SetApplicationLayer(lcm)
+
+	return p.NextDecoder(lcm.NextLayerType())
+}
+
+// DecodeFromBytes decodes the given bytes into this layer.
+func (lcm *LCM) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+	if len(data) < 8 {
+		df.SetTruncated()
+		return errors.New("LCM < 8 bytes")
+	}
+	offset := 0
+
+	lcm.Magic = binary.BigEndian.Uint32(data[offset:4])
+	offset += 4
+
+	if lcm.Magic != LCMShortHeaderMagic && lcm.Magic != LCMFragmentedHeaderMagic {
+		return fmt.Errorf("Received LCM header magic %v does not match know "+
+			"LCM magic numbers. Dropping packet.", lcm.Magic)
+	}
+
+	lcm.SequenceNumber = binary.BigEndian.Uint32(data[offset:8])
+	offset += 4
+
+	if lcm.Magic == LCMFragmentedHeaderMagic {
+		lcm.Fragmented = true
+
+		lcm.PayloadSize = binary.BigEndian.Uint32(data[offset : offset+4])
+		offset += 4
+
+		lcm.FragmentOffset = binary.BigEndian.Uint32(data[offset : offset+4])
+		offset += 4
+
+		lcm.FragmentNumber = binary.BigEndian.Uint16(data[offset : offset+2])
+		offset += 2
+
+		lcm.TotalFragments = binary.BigEndian.Uint16(data[offset : offset+2])
+		offset += 2
+	} else {
+		lcm.Fragmented = false
+	}
+
+	if !lcm.Fragmented || (lcm.Fragmented && lcm.FragmentNumber == 0) {
+		buffer := make([]byte, 0)
+		for _, b := range data[offset:] {
+			offset++
+
+			if b == 0 {
+				break
+			}
+
+			buffer = append(buffer, b)
+		}
+
+		lcm.ChannelName = string(buffer)
+	}
+
+	lcm.fingerprint = LCMFingerprint(
+		binary.BigEndian.Uint64(data[offset : offset+8]))
+
+	lcm.contents = data[:offset]
+	lcm.payload = data[offset:]
+
+	return nil
+}
+
+// CanDecode returns a set of layers that LCM objects can decode.
+// As LCM objects can only decode the LCM layer, we just return that layer.
+func (lcm LCM) CanDecode() gopacket.LayerClass {
+	return LayerTypeLCM
+}
+
+// NextLayerType specifies the LCM payload layer type following this header.
+// As LCM packets are serialized structs with uniq fingerprints for each uniq
+// combination of data types, lookup of correct layer type is based on that
+// fingerprint.
+func (lcm LCM) NextLayerType() gopacket.LayerType {
+	if !lcm.Fragmented || (lcm.Fragmented && lcm.FragmentNumber == 0) {
+		return GetLCMLayerType(lcm.fingerprint)
+	}
+
+	return gopacket.LayerTypeFragment
+}
+
+// LayerType returns LayerTypeLCM
+func (lcm LCM) LayerType() gopacket.LayerType {
+	return LayerTypeLCM
+}
+
+// LayerContents returns the contents of the LCM header.
+func (lcm LCM) LayerContents() []byte {
+	return lcm.contents
+}
+
+// LayerPayload returns the payload following this LCM header.
+func (lcm LCM) LayerPayload() []byte {
+	return lcm.payload
+}
+
+// Payload returns the payload following this LCM header.
+func (lcm LCM) Payload() []byte {
+	return lcm.LayerPayload()
+}
+
+// Fingerprint returns the LCM fingerprint of the underlying message.
+func (lcm LCM) Fingerprint() LCMFingerprint {
+	return lcm.fingerprint
+}

vendor/github.com/google/gopacket/layers/linux_sll.go

@@ -0,0 +1,98 @@
+// Copyright 2012 Google, Inc. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+package layers
+
+import (
+	"encoding/binary"
+	"errors"
+	"fmt"
+	"net"
+
+	"github.com/google/gopacket"
+)
+
+type LinuxSLLPacketType uint16
+
+const (
+	LinuxSLLPacketTypeHost      LinuxSLLPacketType = 0 // To us
+	LinuxSLLPacketTypeBroadcast LinuxSLLPacketType = 1 // To all
+	LinuxSLLPacketTypeMulticast LinuxSLLPacketType = 2 // To group
+	LinuxSLLPacketTypeOtherhost LinuxSLLPacketType = 3 // To someone else
+	LinuxSLLPacketTypeOutgoing  LinuxSLLPacketType = 4 // Outgoing of any type
+	// These ones are invisible by user level
+	LinuxSLLPacketTypeLoopback  LinuxSLLPacketType = 5 // MC/BRD frame looped back
+	LinuxSLLPacketTypeFastroute LinuxSLLPacketType = 6 // Fastrouted frame
+)
+
+func (l LinuxSLLPacketType) String() string {
+	switch l {
+	case LinuxSLLPacketTypeHost:
+		return "host"
+	case LinuxSLLPacketTypeBroadcast:
+		return "broadcast"
+	case LinuxSLLPacketTypeMulticast:
+		return "multicast"
+	case LinuxSLLPacketTypeOtherhost:
+		return "otherhost"
+	case LinuxSLLPacketTypeOutgoing:
+		return "outgoing"
+	case LinuxSLLPacketTypeLoopback:
+		return "loopback"
+	case LinuxSLLPacketTypeFastroute:
+		return "fastroute"
+	}
+	return fmt.Sprintf("Unknown(%d)", int(l))
+}
+
+type LinuxSLL struct {
+	BaseLayer
+	PacketType   LinuxSLLPacketType
+	AddrLen      uint16
+	Addr         net.HardwareAddr
+	EthernetType EthernetType
+	AddrType     uint16
+}
+
+// LayerType returns LayerTypeLinuxSLL.
+func (sll *LinuxSLL) LayerType() gopacket.LayerType { return LayerTypeLinuxSLL }
+
+func (sll *LinuxSLL) CanDecode() gopacket.LayerClass {
+	return LayerTypeLinuxSLL
+}
+
+func (sll *LinuxSLL) LinkFlow() gopacket.Flow {
+	return gopacket.NewFlow(EndpointMAC, sll.Addr, nil)
+}
+
+func (sll *LinuxSLL) NextLayerType() gopacket.LayerType {
+	return sll.EthernetType.LayerType()
+}
+
+func (sll *LinuxSLL) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+	if len(data) < 16 {
+		return errors.New("Linux SLL packet too small")
+	}
+	sll.PacketType = LinuxSLLPacketType(binary.BigEndian.Uint16(data[0:2]))
+	sll.AddrType = binary.BigEndian.Uint16(data[2:4])
+	sll.AddrLen = binary.BigEndian.Uint16(data[4:6])
+
+	sll.Addr = net.HardwareAddr(data[6 : sll.AddrLen+6])
+	sll.EthernetType = EthernetType(binary.BigEndian.Uint16(data[14:16]))
+	sll.BaseLayer = BaseLayer{data[:16], data[16:]}
+
+	return nil
+}
+
+func decodeLinuxSLL(data []byte, p gopacket.PacketBuilder) error {
+	sll := &LinuxSLL{}
+	if err := sll.DecodeFromBytes(data, p); err != nil {
+		return err
+	}
+	p.AddLayer(sll)
+	p.SetLinkLayer(sll)
+	return p.NextDecoder(sll.EthernetType)
+}

vendor/github.com/google/gopacket/layers/llc.go

@@ -0,0 +1,193 @@
+// Copyright 2012 Google, Inc. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+package layers
+
+import (
+	"encoding/binary"
+	"errors"
+
+	"github.com/google/gopacket"
+)
+
+// LLC is the layer used for 802.2 Logical Link Control headers.
+// See http://standards.ieee.org/getieee802/download/802.2-1998.pdf
+type LLC struct {
+	BaseLayer
+	DSAP    uint8
+	IG      bool // true means group, false means individual
+	SSAP    uint8
+	CR      bool // true means response, false means command
+	Control uint16
+}
+
+// LayerType returns gopacket.LayerTypeLLC.
+func (l *LLC) LayerType() gopacket.LayerType { return LayerTypeLLC }
+
+// DecodeFromBytes decodes the given bytes into this layer.
+func (l *LLC) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+	if len(data) < 3 {
+		return errors.New("LLC header too small")
+	}
+	l.DSAP = data[0] & 0xFE
+	l.IG = data[0]&0x1 != 0
+	l.SSAP = data[1] & 0xFE
+	l.CR = data[1]&0x1 != 0
+	l.Control = uint16(data[2])
+
+	if l.Control&0x1 == 0 || l.Control&0x3 == 0x1 {
+		if len(data) < 4 {
+			return errors.New("LLC header too small")
+		}
+		l.Control = l.Control<<8 | uint16(data[3])
+		l.Contents = data[:4]
+		l.Payload = data[4:]
+	} else {
+		l.Contents = data[:3]
+		l.Payload = data[3:]
+	}
+	return nil
+}
+
+// CanDecode returns the set of layer types that this DecodingLayer can decode.
+func (l *LLC) CanDecode() gopacket.LayerClass {
+	return LayerTypeLLC
+}
+
+// NextLayerType returns the layer type contained by this DecodingLayer.
+func (l *LLC) NextLayerType() gopacket.LayerType {
+	switch {
+	case l.DSAP == 0xAA && l.SSAP == 0xAA:
+		return LayerTypeSNAP
+	case l.DSAP == 0x42 && l.SSAP == 0x42:
+		return LayerTypeSTP
+	}
+	return gopacket.LayerTypeZero // Not implemented
+}
+
+// SNAP is used inside LLC.  See
+// http://standards.ieee.org/getieee802/download/802-2001.pdf.
+// From http://en.wikipedia.org/wiki/Subnetwork_Access_Protocol:
+//  "[T]he Subnetwork Access Protocol (SNAP) is a mechanism for multiplexing,
+//  on networks using IEEE 802.2 LLC, more protocols than can be distinguished
+//  by the 8-bit 802.2 Service Access Point (SAP) fields."
+type SNAP struct {
+	BaseLayer
+	OrganizationalCode []byte
+	Type               EthernetType
+}
+
+// LayerType returns gopacket.LayerTypeSNAP.
+func (s *SNAP) LayerType() gopacket.LayerType { return LayerTypeSNAP }
+
+// DecodeFromBytes decodes the given bytes into this layer.
+func (s *SNAP) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+	if len(data) < 5 {
+		return errors.New("SNAP header too small")
+	}
+	s.OrganizationalCode = data[:3]
+	s.Type = EthernetType(binary.BigEndian.Uint16(data[3:5]))
+	s.BaseLayer = BaseLayer{data[:5], data[5:]}
+	return nil
+}
+
+// CanDecode returns the set of layer types that this DecodingLayer can decode.
+func (s *SNAP) CanDecode() gopacket.LayerClass {
+	return LayerTypeSNAP
+}
+
+// NextLayerType returns the layer type contained by this DecodingLayer.
+func (s *SNAP) NextLayerType() gopacket.LayerType {
+	// See BUG(gconnel) in decodeSNAP
+	return s.Type.LayerType()
+}
+
+func decodeLLC(data []byte, p gopacket.PacketBuilder) error {
+	l := &LLC{}
+	err := l.DecodeFromBytes(data, p)
+	if err != nil {
+		return err
+	}
+	p.AddLayer(l)
+	return p.NextDecoder(l.NextLayerType())
+}
+
+func decodeSNAP(data []byte, p gopacket.PacketBuilder) error {
+	s := &SNAP{}
+	err := s.DecodeFromBytes(data, p)
+	if err != nil {
+		return err
+	}
+	p.AddLayer(s)
+	// BUG(gconnell):  When decoding SNAP, we treat the SNAP type as an Ethernet
+	// type.  This may not actually be an ethernet type in all cases,
+	// depending on the organizational code.  Right now, we don't check.
+	return p.NextDecoder(s.Type)
+}
+
+// SerializeTo writes the serialized form of this layer into the
+// SerializationBuffer, implementing gopacket.SerializableLayer.
+// See the docs for gopacket.SerializableLayer for more info.
+func (l *LLC) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	var igFlag, crFlag byte
+	var length int
+
+	if l.Control&0xFF00 != 0 {
+		length = 4
+	} else {
+		length = 3
+	}
+
+	if l.DSAP&0x1 != 0 {
+		return errors.New("DSAP value invalid, should not include IG flag bit")
+	}
+
+	if l.SSAP&0x1 != 0 {
+		return errors.New("SSAP value invalid, should not include CR flag bit")
+	}
+
+	if buf, err := b.PrependBytes(length); err != nil {
+		return err
+	} else {
+		igFlag = 0
+		if l.IG {
+			igFlag = 0x1
+		}
+
+		crFlag = 0
+		if l.CR {
+			crFlag = 0x1
+		}
+
+		buf[0] = l.DSAP + igFlag
+		buf[1] = l.SSAP + crFlag
+
+		if length == 4 {
+			buf[2] = uint8(l.Control >> 8)
+			buf[3] = uint8(l.Control)
+		} else {
+			buf[2] = uint8(l.Control)
+		}
+	}
+
+	return nil
+}
+
+// SerializeTo writes the serialized form of this layer into the
+// SerializationBuffer, implementing gopacket.SerializableLayer.
+// See the docs for gopacket.SerializableLayer for more info.
+func (s *SNAP) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	if buf, err := b.PrependBytes(5); err != nil {
+		return err
+	} else {
+		buf[0] = s.OrganizationalCode[0]
+		buf[1] = s.OrganizationalCode[1]
+		buf[2] = s.OrganizationalCode[2]
+		binary.BigEndian.PutUint16(buf[3:5], uint16(s.Type))
+	}
+
+	return nil
+}

vendor/github.com/google/gopacket/layers/loopback.go

@@ -0,0 +1,80 @@
+// Copyright 2012 Google, Inc. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+package layers
+
+import (
+	"encoding/binary"
+	"errors"
+	"fmt"
+
+	"github.com/google/gopacket"
+)
+
+// Loopback contains the header for loopback encapsulation.  This header is
+// used by both BSD and OpenBSD style loopback decoding (pcap's DLT_NULL
+// and DLT_LOOP, respectively).
+type Loopback struct {
+	BaseLayer
+	Family ProtocolFamily
+}
+
+// LayerType returns LayerTypeLoopback.
+func (l *Loopback) LayerType() gopacket.LayerType { return LayerTypeLoopback }
+
+// DecodeFromBytes decodes the given bytes into this layer.
+func (l *Loopback) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+	if len(data) < 4 {
+		return errors.New("Loopback packet too small")
+	}
+
+	// The protocol could be either big-endian or little-endian, we're
+	// not sure.  But we're PRETTY sure that the value is less than
+	// 256, so we can check the first two bytes.
+	var prot uint32
+	if data[0] == 0 && data[1] == 0 {
+		prot = binary.BigEndian.Uint32(data[:4])
+	} else {
+		prot = binary.LittleEndian.Uint32(data[:4])
+	}
+	if prot > 0xFF {
+		return fmt.Errorf("Invalid loopback protocol %q", data[:4])
+	}
+
+	l.Family = ProtocolFamily(prot)
+	l.BaseLayer = BaseLayer{data[:4], data[4:]}
+	return nil
+}
+
+// CanDecode returns the set of layer types that this DecodingLayer can decode.
+func (l *Loopback) CanDecode() gopacket.LayerClass {
+	return LayerTypeLoopback
+}
+
+// NextLayerType returns the layer type contained by this DecodingLayer.
+func (l *Loopback) NextLayerType() gopacket.LayerType {
+	return l.Family.LayerType()
+}
+
+// SerializeTo writes the serialized form of this layer into the
+// SerializationBuffer, implementing gopacket.SerializableLayer.
+func (l *Loopback) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	bytes, err := b.PrependBytes(4)
+	if err != nil {
+		return err
+	}
+	binary.LittleEndian.PutUint32(bytes, uint32(l.Family))
+	return nil
+}
+
+func decodeLoopback(data []byte, p gopacket.PacketBuilder) error {
+	l := Loopback{}
+	if err := l.DecodeFromBytes(data, gopacket.NilDecodeFeedback); err != nil {
+		return err
+	}
+	p.AddLayer(&l)
+	return p.NextDecoder(l.Family)
+}

vendor/github.com/google/gopacket/layers/mldv1.go

@@ -0,0 +1,182 @@
+// Copyright 2018 GoPacket Authors. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+package layers
+
+import (
+	"encoding/binary"
+	"errors"
+	"fmt"
+	"math"
+	"net"
+	"time"
+
+	"github.com/google/gopacket"
+)
+
+// MLDv1Message represents the common structure of all MLDv1 messages
+type MLDv1Message struct {
+	BaseLayer
+	// 3.4. Maximum Response Delay
+	MaximumResponseDelay time.Duration
+	// 3.6. Multicast Address
+	// Zero in general query
+	// Specific IPv6 multicast address otherwise
+	MulticastAddress net.IP
+}
+
+// DecodeFromBytes decodes the given bytes into this layer.
+func (m *MLDv1Message) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+	if len(data) < 20 {
+		df.SetTruncated()
+		return errors.New("ICMP layer less than 20 bytes for Multicast Listener Query Message V1")
+	}
+
+	m.MaximumResponseDelay = time.Duration(binary.BigEndian.Uint16(data[0:2])) * time.Millisecond
+	// data[2:4] is reserved and not used in mldv1
+	m.MulticastAddress = data[4:20]
+
+	return nil
+}
+
+// NextLayerType returns the layer type contained by this DecodingLayer.
+func (*MLDv1Message) NextLayerType() gopacket.LayerType {
+	return gopacket.LayerTypeZero
+}
+
+// SerializeTo writes the serialized form of this layer into the
+// SerializationBuffer, implementing gopacket.SerializableLayer.
+// See the docs for gopacket.SerializableLayer for more info.
+func (m *MLDv1Message) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	buf, err := b.PrependBytes(20)
+	if err != nil {
+		return err
+	}
+
+	if m.MaximumResponseDelay < 0 {
+		return errors.New("maximum response delay must not be negative")
+	}
+	dms := m.MaximumResponseDelay / time.Millisecond
+	if dms > math.MaxUint16 {
+		return fmt.Errorf("maximum response delay %dms is more than the allowed 65535ms", dms)
+	}
+	binary.BigEndian.PutUint16(buf[0:2], uint16(dms))
+
+	copy(buf[2:4], []byte{0x0, 0x0})
+
+	ma16 := m.MulticastAddress.To16()
+	if ma16 == nil {
+		return fmt.Errorf("invalid multicast address '%s'", m.MulticastAddress)
+	}
+	copy(buf[4:20], ma16)
+
+	return nil
+}
+
+// Sums this layer up nicely formatted
+func (m *MLDv1Message) String() string {
+	return fmt.Sprintf(
+		"Maximum Response Delay: %dms, Multicast Address: %s",
+		m.MaximumResponseDelay/time.Millisecond,
+		m.MulticastAddress)
+}
+
+// MLDv1MulticastListenerQueryMessage are sent by the router to determine
+// whether there are multicast listeners on the link.
+// https://tools.ietf.org/html/rfc2710 Page 5
+type MLDv1MulticastListenerQueryMessage struct {
+	MLDv1Message
+}
+
+// DecodeFromBytes decodes the given bytes into this layer.
+func (m *MLDv1MulticastListenerQueryMessage) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+	err := m.MLDv1Message.DecodeFromBytes(data, df)
+	if err != nil {
+		return err
+	}
+
+	if len(data) > 20 {
+		m.Payload = data[20:]
+	}
+
+	return nil
+}
+
+// LayerType returns LayerTypeMLDv1MulticastListenerQuery.
+func (*MLDv1MulticastListenerQueryMessage) LayerType() gopacket.LayerType {
+	return LayerTypeMLDv1MulticastListenerQuery
+}
+
+// CanDecode returns the set of layer types that this DecodingLayer can decode.
+func (*MLDv1MulticastListenerQueryMessage) CanDecode() gopacket.LayerClass {
+	return LayerTypeMLDv1MulticastListenerQuery
+}
+
+// IsGeneralQuery is true when this is a general query.
+// In a Query message, the Multicast Address field is set to zero when
+// sending a General Query.
+// https://tools.ietf.org/html/rfc2710#section-3.6
+func (m *MLDv1MulticastListenerQueryMessage) IsGeneralQuery() bool {
+	return net.IPv6zero.Equal(m.MulticastAddress)
+}
+
+// IsSpecificQuery is true when this is not a general query.
+// In a Query message, the Multicast Address field is set to a specific
+// IPv6 multicast address when sending a Multicast-Address-Specific Query.
+// https://tools.ietf.org/html/rfc2710#section-3.6
+func (m *MLDv1MulticastListenerQueryMessage) IsSpecificQuery() bool {
+	return !m.IsGeneralQuery()
+}
+
+// MLDv1MulticastListenerReportMessage is sent by a client listening on
+// a specific multicast address to indicate that it is (still) listening
+// on the specific multicast address.
+// https://tools.ietf.org/html/rfc2710 Page 6
+type MLDv1MulticastListenerReportMessage struct {
+	MLDv1Message
+}
+
+// LayerType returns LayerTypeMLDv1MulticastListenerReport.
+func (*MLDv1MulticastListenerReportMessage) LayerType() gopacket.LayerType {
+	return LayerTypeMLDv1MulticastListenerReport
+}
+
+// CanDecode returns the set of layer types that this DecodingLayer can decode.
+func (*MLDv1MulticastListenerReportMessage) CanDecode() gopacket.LayerClass {
+	return LayerTypeMLDv1MulticastListenerReport
+}
+
+// MLDv1MulticastListenerDoneMessage should be sent by a client when it ceases
+// to listen to a multicast address on an interface.
+// https://tools.ietf.org/html/rfc2710 Page 7
+type MLDv1MulticastListenerDoneMessage struct {
+	MLDv1Message
+}
+
+// LayerType returns LayerTypeMLDv1MulticastListenerDone.
+func (*MLDv1MulticastListenerDoneMessage) LayerType() gopacket.LayerType {
+	return LayerTypeMLDv1MulticastListenerDone
+}
+
+// CanDecode returns the set of layer types that this DecodingLayer can decode.
+func (*MLDv1MulticastListenerDoneMessage) CanDecode() gopacket.LayerClass {
+	return LayerTypeMLDv1MulticastListenerDone
+}
+
+func decodeMLDv1MulticastListenerReport(data []byte, p gopacket.PacketBuilder) error {
+	m := &MLDv1MulticastListenerReportMessage{}
+	return decodingLayerDecoder(m, data, p)
+}
+
+func decodeMLDv1MulticastListenerQuery(data []byte, p gopacket.PacketBuilder) error {
+	m := &MLDv1MulticastListenerQueryMessage{}
+	return decodingLayerDecoder(m, data, p)
+}
+
+func decodeMLDv1MulticastListenerDone(data []byte, p gopacket.PacketBuilder) error {
+	m := &MLDv1MulticastListenerDoneMessage{}
+	return decodingLayerDecoder(m, data, p)
+}

vendor/github.com/google/gopacket/layers/mldv2.go

@@ -0,0 +1,619 @@
+// Copyright 2018 GoPacket Authors. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+package layers
+
+import (
+	"encoding/binary"
+	"errors"
+	"fmt"
+	"math"
+	"net"
+	"time"
+
+	"github.com/google/gopacket"
+)
+
+const (
+	// S Flag bit is 1
+	mldv2STrue uint8 = 0x8
+
+	// S Flag value mask
+	//   mldv2STrue & mldv2SMask == mldv2STrue  // true
+	//          0x1 & mldv2SMask == mldv2STrue  // true
+	//          0x0 & mldv2SMask == mldv2STrue  // false
+	mldv2SMask uint8 = 0x8
+
+	// QRV value mask
+	mldv2QRVMask uint8 = 0x7
+)
+
+// MLDv2MulticastListenerQueryMessage are sent by multicast routers to query the
+// multicast listening state of neighboring interfaces.
+// https://tools.ietf.org/html/rfc3810#section-5.1
+//
+// Some information, like Maximum Response Code and Multicast Address are in the
+// previous layer LayerTypeMLDv1MulticastListenerQuery
+type MLDv2MulticastListenerQueryMessage struct {
+	BaseLayer
+	// 5.1.3. Maximum Response Delay COde
+	MaximumResponseCode uint16
+	// 5.1.5. Multicast Address
+	// Zero in general query
+	// Specific IPv6 multicast address otherwise
+	MulticastAddress net.IP
+	// 5.1.7. S Flag (Suppress Router-Side Processing)
+	SuppressRoutersideProcessing bool
+	// 5.1.8. QRV (Querier's Robustness Variable)
+	QueriersRobustnessVariable uint8
+	// 5.1.9. QQIC (Querier's Query Interval Code)
+	QueriersQueryIntervalCode uint8
+	// 5.1.10. Number of Sources (N)
+	NumberOfSources uint16
+	// 5.1.11 Source Address [i]
+	SourceAddresses []net.IP
+}
+
+// DecodeFromBytes decodes the given bytes into this layer.
+func (m *MLDv2MulticastListenerQueryMessage) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+	if len(data) < 24 {
+		df.SetTruncated()
+		return errors.New("ICMP layer less than 24 bytes for Multicast Listener Query Message V2")
+	}
+
+	m.MaximumResponseCode = binary.BigEndian.Uint16(data[0:2])
+	// ignore data[2:4] as per https://tools.ietf.org/html/rfc3810#section-5.1.4
+	m.MulticastAddress = data[4:20]
+	m.SuppressRoutersideProcessing = (data[20] & mldv2SMask) == mldv2STrue
+	m.QueriersRobustnessVariable = data[20] & mldv2QRVMask
+	m.QueriersQueryIntervalCode = data[21]
+
+	m.NumberOfSources = binary.BigEndian.Uint16(data[22:24])
+
+	var end int
+	for i := uint16(0); i < m.NumberOfSources; i++ {
+		begin := 24 + (int(i) * 16)
+		end = begin + 16
+
+		if end > len(data) {
+			df.SetTruncated()
+			return fmt.Errorf("ICMP layer less than %d bytes for Multicast Listener Query Message V2", end)
+		}
+
+		m.SourceAddresses = append(m.SourceAddresses, data[begin:end])
+	}
+
+	return nil
+}
+
+// NextLayerType returns the layer type contained by this DecodingLayer.
+func (*MLDv2MulticastListenerQueryMessage) NextLayerType() gopacket.LayerType {
+	return gopacket.LayerTypeZero
+}
+
+// SerializeTo writes the serialized form of this layer into the
+// SerializationBuffer, implementing gopacket.SerializableLayer.
+// See the docs for gopacket.SerializableLayer for more info.
+func (m *MLDv2MulticastListenerQueryMessage) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	if err := m.serializeSourceAddressesTo(b, opts); err != nil {
+		return err
+	}
+
+	buf, err := b.PrependBytes(24)
+	if err != nil {
+		return err
+	}
+
+	binary.BigEndian.PutUint16(buf[0:2], m.MaximumResponseCode)
+	copy(buf[2:4], []byte{0x00, 0x00}) // set reserved bytes to zero
+
+	ma16 := m.MulticastAddress.To16()
+	if ma16 == nil {
+		return fmt.Errorf("invalid MulticastAddress '%s'", m.MulticastAddress)
+	}
+	copy(buf[4:20], ma16)
+
+	byte20 := m.QueriersRobustnessVariable & mldv2QRVMask
+	if m.SuppressRoutersideProcessing {
+		byte20 |= mldv2STrue
+	} else {
+		byte20 &= ^mldv2STrue // the complement of mldv2STrue
+	}
+	byte20 &= 0x0F // set reserved bits to zero
+	buf[20] = byte20
+
+	binary.BigEndian.PutUint16(buf[22:24], m.NumberOfSources)
+	buf[21] = m.QueriersQueryIntervalCode
+
+	return nil
+}
+
+// writes each source address to the buffer preserving the order
+func (m *MLDv2MulticastListenerQueryMessage) serializeSourceAddressesTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	numberOfSourceAddresses := len(m.SourceAddresses)
+	if numberOfSourceAddresses > math.MaxUint16 {
+		return fmt.Errorf(
+			"there are more than %d source addresses, but 65535 is the maximum number of supported addresses",
+			numberOfSourceAddresses)
+	}
+
+	if opts.FixLengths {
+		m.NumberOfSources = uint16(numberOfSourceAddresses)
+	}
+
+	lastSAIdx := numberOfSourceAddresses - 1
+	for k := range m.SourceAddresses {
+		i := lastSAIdx - k // reverse order
+
+		buf, err := b.PrependBytes(16)
+		if err != nil {
+			return err
+		}
+
+		sa16 := m.SourceAddresses[i].To16()
+		if sa16 == nil {
+			return fmt.Errorf("invalid source address [%d] '%s'", i, m.SourceAddresses[i])
+		}
+		copy(buf[0:16], sa16)
+	}
+
+	return nil
+}
+
+// String sums this layer up nicely formatted
+func (m *MLDv2MulticastListenerQueryMessage) String() string {
+	return fmt.Sprintf(
+		"Maximum Response Code: %#x (%dms), Multicast Address: %s, Suppress Routerside Processing: %t, QRV: %#x, QQIC: %#x (%ds), Number of Source Address: %d (actual: %d), Source Addresses: %s",
+		m.MaximumResponseCode,
+		m.MaximumResponseDelay(),
+		m.MulticastAddress,
+		m.SuppressRoutersideProcessing,
+		m.QueriersRobustnessVariable,
+		m.QueriersQueryIntervalCode,
+		m.QQI()/time.Second,
+		m.NumberOfSources,
+		len(m.SourceAddresses),
+		m.SourceAddresses)
+}
+
+// LayerType returns LayerTypeMLDv2MulticastListenerQuery.
+func (*MLDv2MulticastListenerQueryMessage) LayerType() gopacket.LayerType {
+	return LayerTypeMLDv2MulticastListenerQuery
+}
+
+// CanDecode returns the set of layer types that this DecodingLayer can decode.
+func (*MLDv2MulticastListenerQueryMessage) CanDecode() gopacket.LayerClass {
+	return LayerTypeMLDv2MulticastListenerQuery
+}
+
+// QQI calculates the Querier's Query Interval based on the QQIC
+// according to https://tools.ietf.org/html/rfc3810#section-5.1.9
+func (m *MLDv2MulticastListenerQueryMessage) QQI() time.Duration {
+	data := m.QueriersQueryIntervalCode
+	if data < 128 {
+		return time.Second * time.Duration(data)
+	}
+
+	exp := uint16(data) & 0x70 >> 4
+	mant := uint16(data) & 0x0F
+	return time.Second * time.Duration(mant|0x1000<<(exp+3))
+}
+
+// SetQQI calculates and updates the Querier's Query Interval Code (QQIC)
+// according to https://tools.ietf.org/html/rfc3810#section-5.1.9
+func (m *MLDv2MulticastListenerQueryMessage) SetQQI(d time.Duration) error {
+	if d < 0 {
+		m.QueriersQueryIntervalCode = 0
+		return errors.New("QQI duration is negative")
+	}
+
+	if d == 0 {
+		m.QueriersQueryIntervalCode = 0
+		return nil
+	}
+
+	dms := d / time.Second
+	if dms < 128 {
+		m.QueriersQueryIntervalCode = uint8(dms)
+	}
+
+	if dms > 31744 { // mant=0xF, exp=0x7
+		m.QueriersQueryIntervalCode = 0xFF
+		return fmt.Errorf("QQI duration %ds is, maximum allowed is 31744s", dms)
+	}
+
+	value := uint16(dms) // ok, because 31744 < math.MaxUint16
+	exp := uint8(7)
+	for mask := uint16(0x4000); exp > 0; exp-- {
+		if mask&value != 0 {
+			break
+		}
+
+		mask >>= 1
+	}
+
+	mant := uint8(0x000F & (value >> (exp + 3)))
+	sig := uint8(0x10)
+	m.QueriersQueryIntervalCode = sig | exp<<4 | mant
+
+	return nil
+}
+
+// MaximumResponseDelay returns the Maximum Response Delay based on the
+// Maximum Response Code according to
+// https://tools.ietf.org/html/rfc3810#section-5.1.3
+func (m *MLDv2MulticastListenerQueryMessage) MaximumResponseDelay() time.Duration {
+	if m.MaximumResponseCode < 0x8000 {
+		return time.Duration(m.MaximumResponseCode)
+	}
+
+	exp := m.MaximumResponseCode & 0x7000 >> 12
+	mant := m.MaximumResponseCode & 0x0FFF
+
+	return time.Millisecond * time.Duration(mant|0x1000<<(exp+3))
+}
+
+// SetMLDv2MaximumResponseDelay updates the Maximum Response Code according to
+// https://tools.ietf.org/html/rfc3810#section-5.1.3
+func (m *MLDv2MulticastListenerQueryMessage) SetMLDv2MaximumResponseDelay(d time.Duration) error {
+	if d == 0 {
+		m.MaximumResponseCode = 0
+		return nil
+	}
+
+	if d < 0 {
+		return errors.New("maximum response delay must not be negative")
+	}
+
+	dms := d / time.Millisecond
+
+	if dms < 32768 {
+		m.MaximumResponseCode = uint16(dms)
+	}
+
+	if dms > 4193280 { // mant=0xFFF, exp=0x7
+		return fmt.Errorf("maximum response delay %dms is bigger the than maximum of 4193280ms", dms)
+	}
+
+	value := uint32(dms) // ok, because 4193280 < math.MaxUint32
+	exp := uint8(7)
+	for mask := uint32(0x40000000); exp > 0; exp-- {
+		if mask&value != 0 {
+			break
+		}
+
+		mask >>= 1
+	}
+
+	mant := uint16(0x00000FFF & (value >> (exp + 3)))
+	sig := uint16(0x1000)
+	m.MaximumResponseCode = sig | uint16(exp)<<12 | mant
+	return nil
+}
+
+// MLDv2MulticastListenerReportMessage is sent by an IP node to report the
+// current multicast listening state, or changes therein.
+// https://tools.ietf.org/html/rfc3810#section-5.2
+type MLDv2MulticastListenerReportMessage struct {
+	BaseLayer
+	// 5.2.3. Nr of Mcast Address Records
+	NumberOfMulticastAddressRecords uint16
+	// 5.2.4. Multicast Address Record [i]
+	MulticastAddressRecords []MLDv2MulticastAddressRecord
+}
+
+// DecodeFromBytes decodes the given bytes into this layer.
+func (m *MLDv2MulticastListenerReportMessage) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+	if len(data) < 4 {
+		df.SetTruncated()
+		return errors.New("ICMP layer less than 4 bytes for Multicast Listener Report Message V2")
+	}
+
+	// ignore data[0:2] as per RFC
+	// https://tools.ietf.org/html/rfc3810#section-5.2.1
+	m.NumberOfMulticastAddressRecords = binary.BigEndian.Uint16(data[2:4])
+
+	begin := 4
+	for i := uint16(0); i < m.NumberOfMulticastAddressRecords; i++ {
+		mar := MLDv2MulticastAddressRecord{}
+		read, err := mar.decode(data[begin:], df)
+		if err != nil {
+			return err
+		}
+
+		m.MulticastAddressRecords = append(m.MulticastAddressRecords, mar)
+
+		begin += read
+	}
+
+	return nil
+}
+
+// SerializeTo writes the serialized form of this layer into the
+// SerializationBuffer, implementing gopacket.SerializableLayer.
+// See the docs for gopacket.SerializableLayer for more info.
+func (m *MLDv2MulticastListenerReportMessage) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	lastItemIdx := len(m.MulticastAddressRecords) - 1
+	for k := range m.MulticastAddressRecords {
+		i := lastItemIdx - k // reverse order
+
+		err := m.MulticastAddressRecords[i].serializeTo(b, opts)
+		if err != nil {
+			return err
+		}
+	}
+
+	if opts.FixLengths {
+		numberOfMAR := len(m.MulticastAddressRecords)
+		if numberOfMAR > math.MaxUint16 {
+			return fmt.Errorf(
+				"%d multicast address records added, but the maximum is 65535",
+				numberOfMAR)
+		}
+
+		m.NumberOfMulticastAddressRecords = uint16(numberOfMAR)
+	}
+
+	buf, err := b.PrependBytes(4)
+	if err != nil {
+		return err
+	}
+
+	copy(buf[0:2], []byte{0x0, 0x0})
+	binary.BigEndian.PutUint16(buf[2:4], m.NumberOfMulticastAddressRecords)
+	return nil
+}
+
+// Sums this layer up nicely formatted
+func (m *MLDv2MulticastListenerReportMessage) String() string {
+	return fmt.Sprintf(
+		"Number of Mcast Addr Records: %d (actual %d), Multicast Address Records: %+v",
+		m.NumberOfMulticastAddressRecords,
+		len(m.MulticastAddressRecords),
+		m.MulticastAddressRecords)
+}
+
+// LayerType returns LayerTypeMLDv2MulticastListenerQuery.
+func (*MLDv2MulticastListenerReportMessage) LayerType() gopacket.LayerType {
+	return LayerTypeMLDv2MulticastListenerReport
+}
+
+// CanDecode returns the set of layer types that this DecodingLayer can decode.
+func (*MLDv2MulticastListenerReportMessage) CanDecode() gopacket.LayerClass {
+	return LayerTypeMLDv2MulticastListenerReport
+}
+
+// NextLayerType returns the layer type contained by this DecodingLayer.
+func (*MLDv2MulticastListenerReportMessage) NextLayerType() gopacket.LayerType {
+	return gopacket.LayerTypePayload
+}
+
+// MLDv2MulticastAddressRecordType holds the type of a
+// Multicast Address Record, according to
+// https://tools.ietf.org/html/rfc3810#section-5.2.5 and
+// https://tools.ietf.org/html/rfc3810#section-5.2.12
+type MLDv2MulticastAddressRecordType uint8
+
+const (
+	// MLDv2MulticastAddressRecordTypeModeIsIncluded stands for
+	// MODE_IS_INCLUDE - indicates that the interface has a filter
+	// mode of INCLUDE for the specified multicast address.
+	MLDv2MulticastAddressRecordTypeModeIsIncluded MLDv2MulticastAddressRecordType = 1
+	// MLDv2MulticastAddressRecordTypeModeIsExcluded stands for
+	// MODE_IS_EXCLUDE - indicates that the interface has a filter
+	// mode of EXCLUDE for the specified multicast address.
+	MLDv2MulticastAddressRecordTypeModeIsExcluded MLDv2MulticastAddressRecordType = 2
+	// MLDv2MulticastAddressRecordTypeChangeToIncludeMode stands for
+	// CHANGE_TO_INCLUDE_MODE - indicates that the interface has
+	// changed to INCLUDE filter mode for the specified multicast
+	// address.
+	MLDv2MulticastAddressRecordTypeChangeToIncludeMode MLDv2MulticastAddressRecordType = 3
+	// MLDv2MulticastAddressRecordTypeChangeToExcludeMode stands for
+	// CHANGE_TO_EXCLUDE_MODE - indicates that the interface has
+	// changed to EXCLUDE filter mode for the specified multicast
+	// address
+	MLDv2MulticastAddressRecordTypeChangeToExcludeMode MLDv2MulticastAddressRecordType = 4
+	// MLDv2MulticastAddressRecordTypeAllowNewSources stands for
+	// ALLOW_NEW_SOURCES - indicates that the Source Address [i]
+	// fields in this Multicast Address Record contain a list of
+	// the additional sources that the node wishes to listen to,
+	// for packets sent to the specified multicast address.
+	MLDv2MulticastAddressRecordTypeAllowNewSources MLDv2MulticastAddressRecordType = 5
+	// MLDv2MulticastAddressRecordTypeBlockOldSources stands for
+	// BLOCK_OLD_SOURCES - indicates that the Source Address [i]
+	// fields in this Multicast Address Record contain a list of
+	// the sources that the node no longer wishes to listen to,
+	// for packets sent to the specified multicast address.
+	MLDv2MulticastAddressRecordTypeBlockOldSources MLDv2MulticastAddressRecordType = 6
+)
+
+// Human readable record types
+// Naming follows https://tools.ietf.org/html/rfc3810#section-5.2.12
+func (m MLDv2MulticastAddressRecordType) String() string {
+	switch m {
+	case MLDv2MulticastAddressRecordTypeModeIsIncluded:
+		return "MODE_IS_INCLUDE"
+	case MLDv2MulticastAddressRecordTypeModeIsExcluded:
+		return "MODE_IS_EXCLUDE"
+	case MLDv2MulticastAddressRecordTypeChangeToIncludeMode:
+		return "CHANGE_TO_INCLUDE_MODE"
+	case MLDv2MulticastAddressRecordTypeChangeToExcludeMode:
+		return "CHANGE_TO_EXCLUDE_MODE"
+	case MLDv2MulticastAddressRecordTypeAllowNewSources:
+		return "ALLOW_NEW_SOURCES"
+	case MLDv2MulticastAddressRecordTypeBlockOldSources:
+		return "BLOCK_OLD_SOURCES"
+	default:
+		return fmt.Sprintf("UNKNOWN(%d)", m)
+	}
+}
+
+// MLDv2MulticastAddressRecord contains information on the sender listening to a
+// single multicast address on the interface the report is sent.
+// https://tools.ietf.org/html/rfc3810#section-5.2.4
+type MLDv2MulticastAddressRecord struct {
+	// 5.2.5. Record Type
+	RecordType MLDv2MulticastAddressRecordType
+	// 5.2.6. Auxiliary Data Length (number of 32-bit words)
+	AuxDataLen uint8
+	// 5.2.7. Number Of Sources (N)
+	N uint16
+	// 5.2.8. Multicast Address
+	MulticastAddress net.IP
+	// 5.2.9 Source Address [i]
+	SourceAddresses []net.IP
+	// 5.2.10 Auxiliary Data
+	AuxiliaryData []byte
+}
+
+// decodes a multicast address record from bytes
+func (m *MLDv2MulticastAddressRecord) decode(data []byte, df gopacket.DecodeFeedback) (int, error) {
+	if len(data) < 20 {
+		df.SetTruncated()
+		return 0, errors.New(
+			"Multicast Listener Report Message V2 layer less than 4 bytes for Multicast Address Record")
+	}
+
+	m.RecordType = MLDv2MulticastAddressRecordType(data[0])
+	m.AuxDataLen = data[1]
+	m.N = binary.BigEndian.Uint16(data[2:4])
+	m.MulticastAddress = data[4:20]
+
+	for i := uint16(0); i < m.N; i++ {
+		begin := 20 + (int(i) * 16)
+		end := begin + 16
+
+		if len(data) < end {
+			df.SetTruncated()
+			return begin, fmt.Errorf(
+				"Multicast Listener Report Message V2 layer less than %d bytes for Multicast Address Record", end)
+		}
+
+		m.SourceAddresses = append(m.SourceAddresses, data[begin:end])
+	}
+
+	expectedLengthWithouAuxData := 20 + (int(m.N) * 16)
+	expectedTotalLength := (int(m.AuxDataLen) * 4) + expectedLengthWithouAuxData // *4 because AuxDataLen are 32bit words
+	if len(data) < expectedTotalLength {
+		return expectedLengthWithouAuxData, fmt.Errorf(
+			"Multicast Listener Report Message V2 layer less than %d bytes for Multicast Address Record",
+			expectedLengthWithouAuxData)
+	}
+
+	m.AuxiliaryData = data[expectedLengthWithouAuxData:expectedTotalLength]
+
+	return expectedTotalLength, nil
+}
+
+// String sums this layer up nicely formatted
+func (m *MLDv2MulticastAddressRecord) String() string {
+	return fmt.Sprintf(
+		"RecordType: %d (%s), AuxDataLen: %d [32-bit words], N: %d, Multicast Address: %s, SourceAddresses: %s, Auxiliary Data: %#x",
+		m.RecordType,
+		m.RecordType.String(),
+		m.AuxDataLen,
+		m.N,
+		m.MulticastAddress.To16(),
+		m.SourceAddresses,
+		m.AuxiliaryData)
+}
+
+// serializes a multicast address record
+func (m *MLDv2MulticastAddressRecord) serializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	if err := m.serializeAuxiliaryDataTo(b, opts); err != nil {
+		return err
+	}
+
+	if err := m.serializeSourceAddressesTo(b, opts); err != nil {
+		return err
+	}
+
+	buf, err := b.PrependBytes(20)
+	if err != nil {
+		return err
+	}
+
+	buf[0] = uint8(m.RecordType)
+	buf[1] = m.AuxDataLen
+	binary.BigEndian.PutUint16(buf[2:4], m.N)
+
+	ma16 := m.MulticastAddress.To16()
+	if ma16 == nil {
+		return fmt.Errorf("invalid multicast address '%s'", m.MulticastAddress)
+	}
+	copy(buf[4:20], ma16)
+
+	return nil
+}
+
+// serializes the auxiliary data of a multicast address record
+func (m *MLDv2MulticastAddressRecord) serializeAuxiliaryDataTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	if remainder := len(m.AuxiliaryData) % 4; remainder != 0 {
+		zeroWord := []byte{0x0, 0x0, 0x0, 0x0}
+		m.AuxiliaryData = append(m.AuxiliaryData, zeroWord[:remainder]...)
+	}
+
+	if opts.FixLengths {
+		auxDataLen := len(m.AuxiliaryData) / 4
+
+		if auxDataLen > math.MaxUint8 {
+			return fmt.Errorf("auxilary data is %d 32-bit words, but the maximum is 255 32-bit words", auxDataLen)
+		}
+
+		m.AuxDataLen = uint8(auxDataLen)
+	}
+
+	buf, err := b.PrependBytes(len(m.AuxiliaryData))
+	if err != nil {
+		return err
+	}
+
+	copy(buf, m.AuxiliaryData)
+	return nil
+}
+
+// serializes the source addresses of a multicast address record preserving the order
+func (m *MLDv2MulticastAddressRecord) serializeSourceAddressesTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	if opts.FixLengths {
+		numberOfSourceAddresses := len(m.SourceAddresses)
+
+		if numberOfSourceAddresses > math.MaxUint16 {
+			return fmt.Errorf(
+				"%d source addresses added, but the maximum is 65535",
+				numberOfSourceAddresses)
+		}
+
+		m.N = uint16(numberOfSourceAddresses)
+	}
+
+	lastItemIdx := len(m.SourceAddresses) - 1
+	for k := range m.SourceAddresses {
+		i := lastItemIdx - k // reverse order
+
+		buf, err := b.PrependBytes(16)
+		if err != nil {
+			return err
+		}
+
+		sa16 := m.SourceAddresses[i].To16()
+		if sa16 == nil {
+			return fmt.Errorf("invalid source address [%d] '%s'", i, m.SourceAddresses[i])
+		}
+		copy(buf, sa16)
+	}
+
+	return nil
+}
+
+func decodeMLDv2MulticastListenerReport(data []byte, p gopacket.PacketBuilder) error {
+	m := &MLDv2MulticastListenerReportMessage{}
+	return decodingLayerDecoder(m, data, p)
+}
+
+func decodeMLDv2MulticastListenerQuery(data []byte, p gopacket.PacketBuilder) error {
+	m := &MLDv2MulticastListenerQueryMessage{}
+	return decodingLayerDecoder(m, data, p)
+}

vendor/github.com/google/gopacket/layers/modbustcp.go

@@ -0,0 +1,150 @@
+// Copyright 2018, The GoPacket Authors, All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+//
+//******************************************************************************
+
+package layers
+
+import (
+	"encoding/binary"
+	"errors"
+	"github.com/google/gopacket"
+)
+
+//******************************************************************************
+//
+// ModbusTCP Decoding Layer
+// ------------------------------------------
+// This file provides a GoPacket decoding layer for ModbusTCP.
+//
+//******************************************************************************
+
+const mbapRecordSizeInBytes int = 7
+const modbusPDUMinimumRecordSizeInBytes int = 2
+const modbusPDUMaximumRecordSizeInBytes int = 253
+
+// ModbusProtocol type
+type ModbusProtocol uint16
+
+// ModbusProtocol known values.
+const (
+	ModbusProtocolModbus ModbusProtocol = 0
+)
+
+func (mp ModbusProtocol) String() string {
+	switch mp {
+	default:
+		return "Unknown"
+	case ModbusProtocolModbus:
+		return "Modbus"
+	}
+}
+
+//******************************************************************************
+
+// ModbusTCP Type
+// --------
+// Type ModbusTCP implements the DecodingLayer interface. Each ModbusTCP object
+// represents in a structured form the MODBUS Application Protocol header (MBAP) record present as the TCP
+// payload in an ModbusTCP TCP packet.
+//
+type ModbusTCP struct {
+	BaseLayer // Stores the packet bytes and payload (Modbus PDU) bytes .
+
+	TransactionIdentifier uint16         // Identification of a MODBUS Request/Response transaction
+	ProtocolIdentifier    ModbusProtocol // It is used for intra-system multiplexing
+	Length                uint16         // Number of following bytes (includes 1 byte for UnitIdentifier + Modbus data length
+	UnitIdentifier        uint8          // Identification of a remote slave connected on a serial line or on other buses
+}
+
+//******************************************************************************
+
+// LayerType returns the layer type of the ModbusTCP object, which is LayerTypeModbusTCP.
+func (d *ModbusTCP) LayerType() gopacket.LayerType {
+	return LayerTypeModbusTCP
+}
+
+//******************************************************************************
+
+// decodeModbusTCP analyses a byte slice and attempts to decode it as an ModbusTCP
+// record of a TCP packet.
+//
+// If it succeeds, it loads p with information about the packet and returns nil.
+// If it fails, it returns an error (non nil).
+//
+// This function is employed in layertypes.go to register the ModbusTCP layer.
+func decodeModbusTCP(data []byte, p gopacket.PacketBuilder) error {
+
+	// Attempt to decode the byte slice.
+	d := &ModbusTCP{}
+	err := d.DecodeFromBytes(data, p)
+	if err != nil {
+		return err
+	}
+	// If the decoding worked, add the layer to the packet and set it
+	// as the application layer too, if there isn't already one.
+	p.AddLayer(d)
+	p.SetApplicationLayer(d)
+
+	return p.NextDecoder(d.NextLayerType())
+
+}
+
+//******************************************************************************
+
+// DecodeFromBytes analyses a byte slice and attempts to decode it as an ModbusTCP
+// record of a TCP packet.
+//
+// Upon succeeds, it loads the ModbusTCP object with information about the packet
+// and returns nil.
+// Upon failure, it returns an error (non nil).
+func (d *ModbusTCP) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+
+	// If the data block is too short to be a MBAP record, then return an error.
+	if len(data) < mbapRecordSizeInBytes+modbusPDUMinimumRecordSizeInBytes {
+		df.SetTruncated()
+		return errors.New("ModbusTCP packet too short")
+	}
+
+	if len(data) > mbapRecordSizeInBytes+modbusPDUMaximumRecordSizeInBytes {
+		df.SetTruncated()
+		return errors.New("ModbusTCP packet too long")
+	}
+
+	// ModbusTCP type embeds type BaseLayer which contains two fields:
+	//    Contents is supposed to contain the bytes of the data at this level (MPBA).
+	//    Payload is supposed to contain the payload of this level (PDU).
+	d.BaseLayer = BaseLayer{Contents: data[:mbapRecordSizeInBytes], Payload: data[mbapRecordSizeInBytes:len(data)]}
+
+	// Extract the fields from the block of bytes.
+	// The fields can just be copied in big endian order.
+	d.TransactionIdentifier = binary.BigEndian.Uint16(data[:2])
+	d.ProtocolIdentifier = ModbusProtocol(binary.BigEndian.Uint16(data[2:4]))
+	d.Length = binary.BigEndian.Uint16(data[4:6])
+
+	// Length should have the size of the payload plus one byte (size of UnitIdentifier)
+	if d.Length != uint16(len(d.BaseLayer.Payload)+1) {
+		df.SetTruncated()
+		return errors.New("ModbusTCP packet with wrong field value (Length)")
+	}
+	d.UnitIdentifier = uint8(data[6])
+
+	return nil
+}
+
+//******************************************************************************
+
+// NextLayerType returns the layer type of the ModbusTCP payload, which is LayerTypePayload.
+func (d *ModbusTCP) NextLayerType() gopacket.LayerType {
+	return gopacket.LayerTypePayload
+}
+
+//******************************************************************************
+
+// Payload returns Modbus Protocol Data Unit (PDU) composed by Function Code and Data, it is carried within ModbusTCP packets
+func (d *ModbusTCP) Payload() []byte {
+	return d.BaseLayer.Payload
+}

vendor/github.com/google/gopacket/layers/mpls.go

@@ -0,0 +1,87 @@
+// Copyright 2012 Google, Inc. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+package layers
+
+import (
+	"encoding/binary"
+	"errors"
+	"github.com/google/gopacket"
+)
+
+// MPLS is the MPLS packet header.
+type MPLS struct {
+	BaseLayer
+	Label        uint32
+	TrafficClass uint8
+	StackBottom  bool
+	TTL          uint8
+}
+
+// LayerType returns gopacket.LayerTypeMPLS.
+func (m *MPLS) LayerType() gopacket.LayerType { return LayerTypeMPLS }
+
+// ProtocolGuessingDecoder attempts to guess the protocol of the bytes it's
+// given, then decode the packet accordingly.  Its algorithm for guessing is:
+//  If the packet starts with byte 0x45-0x4F: IPv4
+//  If the packet starts with byte 0x60-0x6F: IPv6
+//  Otherwise:  Error
+// See draft-hsmit-isis-aal5mux-00.txt for more detail on this approach.
+type ProtocolGuessingDecoder struct{}
+
+func (ProtocolGuessingDecoder) Decode(data []byte, p gopacket.PacketBuilder) error {
+	switch data[0] {
+	// 0x40 | header_len, where header_len is at least 5.
+	case 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f:
+		return decodeIPv4(data, p)
+		// IPv6 can start with any byte whose first 4 bits are 0x6.
+	case 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f:
+		return decodeIPv6(data, p)
+	}
+	return errors.New("Unable to guess protocol of packet data")
+}
+
+// MPLSPayloadDecoder is the decoder used to data encapsulated by each MPLS
+// layer.  MPLS contains no type information, so we have to explicitly decide
+// which decoder to use.  This is initially set to ProtocolGuessingDecoder, our
+// simple attempt at guessing protocols based on the first few bytes of data
+// available to us.  However, if you know that in your environment MPLS always
+// encapsulates a specific protocol, you may reset this.
+var MPLSPayloadDecoder gopacket.Decoder = ProtocolGuessingDecoder{}
+
+func decodeMPLS(data []byte, p gopacket.PacketBuilder) error {
+	decoded := binary.BigEndian.Uint32(data[:4])
+	mpls := &MPLS{
+		Label:        decoded >> 12,
+		TrafficClass: uint8(decoded>>9) & 0x7,
+		StackBottom:  decoded&0x100 != 0,
+		TTL:          uint8(decoded),
+		BaseLayer:    BaseLayer{data[:4], data[4:]},
+	}
+	p.AddLayer(mpls)
+	if mpls.StackBottom {
+		return p.NextDecoder(MPLSPayloadDecoder)
+	}
+	return p.NextDecoder(gopacket.DecodeFunc(decodeMPLS))
+}
+
+// SerializeTo writes the serialized form of this layer into the
+// SerializationBuffer, implementing gopacket.SerializableLayer.
+// See the docs for gopacket.SerializableLayer for more info.
+func (m *MPLS) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	bytes, err := b.PrependBytes(4)
+	if err != nil {
+		return err
+	}
+	encoded := m.Label << 12
+	encoded |= uint32(m.TrafficClass) << 9
+	encoded |= uint32(m.TTL)
+	if m.StackBottom {
+		encoded |= 0x100
+	}
+	binary.BigEndian.PutUint32(bytes, encoded)
+	return nil
+}

vendor/github.com/google/gopacket/layers/ndp.go

@@ -0,0 +1,611 @@
+// Copyright 2012 Google, Inc. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+// Enum types courtesy of...
+// http://anonsvn.wireshark.org/wireshark/trunk/epan/dissectors/packet-ndp.c
+
+package layers
+
+import (
+	"fmt"
+	"github.com/google/gopacket"
+	"net"
+)
+
+type NDPChassisType uint8
+
+// Nortel Chassis Types
+const (
+	NDPChassisother                                       NDPChassisType = 1
+	NDPChassis3000                                        NDPChassisType = 2
+	NDPChassis3030                                        NDPChassisType = 3
+	NDPChassis2310                                        NDPChassisType = 4
+	NDPChassis2810                                        NDPChassisType = 5
+	NDPChassis2912                                        NDPChassisType = 6
+	NDPChassis2914                                        NDPChassisType = 7
+	NDPChassis271x                                        NDPChassisType = 8
+	NDPChassis2813                                        NDPChassisType = 9
+	NDPChassis2814                                        NDPChassisType = 10
+	NDPChassis2915                                        NDPChassisType = 11
+	NDPChassis5000                                        NDPChassisType = 12
+	NDPChassis2813SA                                      NDPChassisType = 13
+	NDPChassis2814SA                                      NDPChassisType = 14
+	NDPChassis810M                                        NDPChassisType = 15
+	NDPChassisEthercell                                   NDPChassisType = 16
+	NDPChassis5005                                        NDPChassisType = 17
+	NDPChassisAlcatelEWC                                  NDPChassisType = 18
+	NDPChassis2715SA                                      NDPChassisType = 20
+	NDPChassis2486                                        NDPChassisType = 21
+	NDPChassis28000series                                 NDPChassisType = 22
+	NDPChassis23000series                                 NDPChassisType = 23
+	NDPChassis5DN00xseries                                NDPChassisType = 24
+	NDPChassisBayStackEthernet                            NDPChassisType = 25
+	NDPChassis23100series                                 NDPChassisType = 26
+	NDPChassis100BaseTHub                                 NDPChassisType = 27
+	NDPChassis3000FastEthernet                            NDPChassisType = 28
+	NDPChassisOrionSwitch                                 NDPChassisType = 29
+	NDPChassisDDS                                         NDPChassisType = 31
+	NDPChassisCentillion6slot                             NDPChassisType = 32
+	NDPChassisCentillion12slot                            NDPChassisType = 33
+	NDPChassisCentillion1slot                             NDPChassisType = 34
+	NDPChassisBayStack301                                 NDPChassisType = 35
+	NDPChassisBayStackTokenRingHub                        NDPChassisType = 36
+	NDPChassisFVCMultimediaSwitch                         NDPChassisType = 37
+	NDPChassisSwitchNode                                  NDPChassisType = 38
+	NDPChassisBayStack302Switch                           NDPChassisType = 39
+	NDPChassisBayStack350Switch                           NDPChassisType = 40
+	NDPChassisBayStack150EthernetHub                      NDPChassisType = 41
+	NDPChassisCentillion50NSwitch                         NDPChassisType = 42
+	NDPChassisCentillion50TSwitch                         NDPChassisType = 43
+	NDPChassisBayStack303304Switches                      NDPChassisType = 44
+	NDPChassisBayStack200EthernetHub                      NDPChassisType = 45
+	NDPChassisBayStack25010100EthernetHub                 NDPChassisType = 46
+	NDPChassisBayStack450101001000Switches                NDPChassisType = 48
+	NDPChassisBayStack41010100Switches                    NDPChassisType = 49
+	NDPChassisPassport1200L3Switch                        NDPChassisType = 50
+	NDPChassisPassport1250L3Switch                        NDPChassisType = 51
+	NDPChassisPassport1100L3Switch                        NDPChassisType = 52
+	NDPChassisPassport1150L3Switch                        NDPChassisType = 53
+	NDPChassisPassport1050L3Switch                        NDPChassisType = 54
+	NDPChassisPassport1051L3Switch                        NDPChassisType = 55
+	NDPChassisPassport8610L3Switch                        NDPChassisType = 56
+	NDPChassisPassport8606L3Switch                        NDPChassisType = 57
+	NDPChassisPassport8010                                NDPChassisType = 58
+	NDPChassisPassport8006                                NDPChassisType = 59
+	NDPChassisBayStack670wirelessaccesspoint              NDPChassisType = 60
+	NDPChassisPassport740                                 NDPChassisType = 61
+	NDPChassisPassport750                                 NDPChassisType = 62
+	NDPChassisPassport790                                 NDPChassisType = 63
+	NDPChassisBusinessPolicySwitch200010100Switches       NDPChassisType = 64
+	NDPChassisPassport8110L2Switch                        NDPChassisType = 65
+	NDPChassisPassport8106L2Switch                        NDPChassisType = 66
+	NDPChassisBayStack3580GigSwitch                       NDPChassisType = 67
+	NDPChassisBayStack10PowerSupplyUnit                   NDPChassisType = 68
+	NDPChassisBayStack42010100Switch                      NDPChassisType = 69
+	NDPChassisOPTeraMetro1200EthernetServiceModule        NDPChassisType = 70
+	NDPChassisOPTera8010co                                NDPChassisType = 71
+	NDPChassisOPTera8610coL3Switch                        NDPChassisType = 72
+	NDPChassisOPTera8110coL2Switch                        NDPChassisType = 73
+	NDPChassisOPTera8003                                  NDPChassisType = 74
+	NDPChassisOPTera8603L3Switch                          NDPChassisType = 75
+	NDPChassisOPTera8103L2Switch                          NDPChassisType = 76
+	NDPChassisBayStack380101001000Switch                  NDPChassisType = 77
+	NDPChassisEthernetSwitch47048T                        NDPChassisType = 78
+	NDPChassisOPTeraMetro1450EthernetServiceModule        NDPChassisType = 79
+	NDPChassisOPTeraMetro1400EthernetServiceModule        NDPChassisType = 80
+	NDPChassisAlteonSwitchFamily                          NDPChassisType = 81
+	NDPChassisEthernetSwitch46024TPWR                     NDPChassisType = 82
+	NDPChassisOPTeraMetro8010OPML2Switch                  NDPChassisType = 83
+	NDPChassisOPTeraMetro8010coOPML2Switch                NDPChassisType = 84
+	NDPChassisOPTeraMetro8006OPML2Switch                  NDPChassisType = 85
+	NDPChassisOPTeraMetro8003OPML2Switch                  NDPChassisType = 86
+	NDPChassisAlteon180e                                  NDPChassisType = 87
+	NDPChassisAlteonAD3                                   NDPChassisType = 88
+	NDPChassisAlteon184                                   NDPChassisType = 89
+	NDPChassisAlteonAD4                                   NDPChassisType = 90
+	NDPChassisPassport1424L3Switch                        NDPChassisType = 91
+	NDPChassisPassport1648L3Switch                        NDPChassisType = 92
+	NDPChassisPassport1612L3Switch                        NDPChassisType = 93
+	NDPChassisPassport1624L3Switch                        NDPChassisType = 94
+	NDPChassisBayStack38024FFiber1000Switch               NDPChassisType = 95
+	NDPChassisEthernetRoutingSwitch551024T                NDPChassisType = 96
+	NDPChassisEthernetRoutingSwitch551048T                NDPChassisType = 97
+	NDPChassisEthernetSwitch47024T                        NDPChassisType = 98
+	NDPChassisNortelNetworksWirelessLANAccessPoint2220    NDPChassisType = 99
+	NDPChassisPassportRBS2402L3Switch                     NDPChassisType = 100
+	NDPChassisAlteonApplicationSwitch2424                 NDPChassisType = 101
+	NDPChassisAlteonApplicationSwitch2224                 NDPChassisType = 102
+	NDPChassisAlteonApplicationSwitch2208                 NDPChassisType = 103
+	NDPChassisAlteonApplicationSwitch2216                 NDPChassisType = 104
+	NDPChassisAlteonApplicationSwitch3408                 NDPChassisType = 105
+	NDPChassisAlteonApplicationSwitch3416                 NDPChassisType = 106
+	NDPChassisNortelNetworksWirelessLANSecuritySwitch2250 NDPChassisType = 107
+	NDPChassisEthernetSwitch42548T                        NDPChassisType = 108
+	NDPChassisEthernetSwitch42524T                        NDPChassisType = 109
+	NDPChassisNortelNetworksWirelessLANAccessPoint2221    NDPChassisType = 110
+	NDPChassisNortelMetroEthernetServiceUnit24TSPFswitch  NDPChassisType = 111
+	NDPChassisNortelMetroEthernetServiceUnit24TLXDCswitch NDPChassisType = 112
+	NDPChassisPassport830010slotchassis                   NDPChassisType = 113
+	NDPChassisPassport83006slotchassis                    NDPChassisType = 114
+	NDPChassisEthernetRoutingSwitch552024TPWR             NDPChassisType = 115
+	NDPChassisEthernetRoutingSwitch552048TPWR             NDPChassisType = 116
+	NDPChassisNortelNetworksVPNGateway3050                NDPChassisType = 117
+	NDPChassisAlteonSSL31010100                           NDPChassisType = 118
+	NDPChassisAlteonSSL31010100Fiber                      NDPChassisType = 119
+	NDPChassisAlteonSSL31010100FIPS                       NDPChassisType = 120
+	NDPChassisAlteonSSL410101001000                       NDPChassisType = 121
+	NDPChassisAlteonSSL410101001000Fiber                  NDPChassisType = 122
+	NDPChassisAlteonApplicationSwitch2424SSL              NDPChassisType = 123
+	NDPChassisEthernetSwitch32524T                        NDPChassisType = 124
+	NDPChassisEthernetSwitch32524G                        NDPChassisType = 125
+	NDPChassisNortelNetworksWirelessLANAccessPoint2225    NDPChassisType = 126
+	NDPChassisNortelNetworksWirelessLANSecuritySwitch2270 NDPChassisType = 127
+	NDPChassis24portEthernetSwitch47024TPWR               NDPChassisType = 128
+	NDPChassis48portEthernetSwitch47048TPWR               NDPChassisType = 129
+	NDPChassisEthernetRoutingSwitch553024TFD              NDPChassisType = 130
+	NDPChassisEthernetSwitch351024T                       NDPChassisType = 131
+	NDPChassisNortelMetroEthernetServiceUnit12GACL3Switch NDPChassisType = 132
+	NDPChassisNortelMetroEthernetServiceUnit12GDCL3Switch NDPChassisType = 133
+	NDPChassisNortelSecureAccessSwitch                    NDPChassisType = 134
+	NDPChassisNortelNetworksVPNGateway3070                NDPChassisType = 135
+	NDPChassisOPTeraMetro3500                             NDPChassisType = 136
+	NDPChassisSMBBES101024T                               NDPChassisType = 137
+	NDPChassisSMBBES101048T                               NDPChassisType = 138
+	NDPChassisSMBBES102024TPWR                            NDPChassisType = 139
+	NDPChassisSMBBES102048TPWR                            NDPChassisType = 140
+	NDPChassisSMBBES201024T                               NDPChassisType = 141
+	NDPChassisSMBBES201048T                               NDPChassisType = 142
+	NDPChassisSMBBES202024TPWR                            NDPChassisType = 143
+	NDPChassisSMBBES202048TPWR                            NDPChassisType = 144
+	NDPChassisSMBBES11024T                                NDPChassisType = 145
+	NDPChassisSMBBES11048T                                NDPChassisType = 146
+	NDPChassisSMBBES12024TPWR                             NDPChassisType = 147
+	NDPChassisSMBBES12048TPWR                             NDPChassisType = 148
+	NDPChassisSMBBES21024T                                NDPChassisType = 149
+	NDPChassisSMBBES21048T                                NDPChassisType = 150
+	NDPChassisSMBBES22024TPWR                             NDPChassisType = 151
+	NDPChassisSMBBES22048TPWR                             NDPChassisType = 152
+	NDPChassisOME6500                                     NDPChassisType = 153
+	NDPChassisEthernetRoutingSwitch4548GT                 NDPChassisType = 154
+	NDPChassisEthernetRoutingSwitch4548GTPWR              NDPChassisType = 155
+	NDPChassisEthernetRoutingSwitch4550T                  NDPChassisType = 156
+	NDPChassisEthernetRoutingSwitch4550TPWR               NDPChassisType = 157
+	NDPChassisEthernetRoutingSwitch4526FX                 NDPChassisType = 158
+	NDPChassisEthernetRoutingSwitch250026T                NDPChassisType = 159
+	NDPChassisEthernetRoutingSwitch250026TPWR             NDPChassisType = 160
+	NDPChassisEthernetRoutingSwitch250050T                NDPChassisType = 161
+	NDPChassisEthernetRoutingSwitch250050TPWR             NDPChassisType = 162
+)
+
+type NDPBackplaneType uint8
+
+// Nortel Backplane Types
+const (
+	NDPBackplaneOther                                       NDPBackplaneType = 1
+	NDPBackplaneEthernet                                    NDPBackplaneType = 2
+	NDPBackplaneEthernetTokenring                           NDPBackplaneType = 3
+	NDPBackplaneEthernetFDDI                                NDPBackplaneType = 4
+	NDPBackplaneEthernetTokenringFDDI                       NDPBackplaneType = 5
+	NDPBackplaneEthernetTokenringRedundantPower             NDPBackplaneType = 6
+	NDPBackplaneEthernetTokenringFDDIRedundantPower         NDPBackplaneType = 7
+	NDPBackplaneTokenRing                                   NDPBackplaneType = 8
+	NDPBackplaneEthernetTokenringFastEthernet               NDPBackplaneType = 9
+	NDPBackplaneEthernetFastEthernet                        NDPBackplaneType = 10
+	NDPBackplaneEthernetTokenringFastEthernetRedundantPower NDPBackplaneType = 11
+	NDPBackplaneEthernetFastEthernetGigabitEthernet         NDPBackplaneType = 12
+)
+
+type NDPState uint8
+
+// Device State
+const (
+	NDPStateTopology  NDPState = 1
+	NDPStateHeartbeat NDPState = 2
+	NDPStateNew       NDPState = 3
+)
+
+// NortelDiscovery is a packet layer containing the Nortel Discovery Protocol.
+type NortelDiscovery struct {
+	BaseLayer
+	IPAddress net.IP
+	SegmentID []byte
+	Chassis   NDPChassisType
+	Backplane NDPBackplaneType
+	State     NDPState
+	NumLinks  uint8
+}
+
+// LayerType returns gopacket.LayerTypeNortelDiscovery.
+func (c *NortelDiscovery) LayerType() gopacket.LayerType {
+	return LayerTypeNortelDiscovery
+}
+
+func decodeNortelDiscovery(data []byte, p gopacket.PacketBuilder) error {
+	c := &NortelDiscovery{}
+	if len(data) < 11 {
+		return fmt.Errorf("Invalid NortelDiscovery packet length %d", len(data))
+	}
+	c.IPAddress = data[0:4]
+	c.SegmentID = data[4:7]
+	c.Chassis = NDPChassisType(data[7])
+	c.Backplane = NDPBackplaneType(data[8])
+	c.State = NDPState(data[9])
+	c.NumLinks = uint8(data[10])
+	p.AddLayer(c)
+	return nil
+}
+
+func (t NDPChassisType) String() (s string) {
+	switch t {
+	case NDPChassisother:
+		s = "other"
+	case NDPChassis3000:
+		s = "3000"
+	case NDPChassis3030:
+		s = "3030"
+	case NDPChassis2310:
+		s = "2310"
+	case NDPChassis2810:
+		s = "2810"
+	case NDPChassis2912:
+		s = "2912"
+	case NDPChassis2914:
+		s = "2914"
+	case NDPChassis271x:
+		s = "271x"
+	case NDPChassis2813:
+		s = "2813"
+	case NDPChassis2814:
+		s = "2814"
+	case NDPChassis2915:
+		s = "2915"
+	case NDPChassis5000:
+		s = "5000"
+	case NDPChassis2813SA:
+		s = "2813SA"
+	case NDPChassis2814SA:
+		s = "2814SA"
+	case NDPChassis810M:
+		s = "810M"
+	case NDPChassisEthercell:
+		s = "Ethercell"
+	case NDPChassis5005:
+		s = "5005"
+	case NDPChassisAlcatelEWC:
+		s = "Alcatel Ethernet workgroup conc."
+	case NDPChassis2715SA:
+		s = "2715SA"
+	case NDPChassis2486:
+		s = "2486"
+	case NDPChassis28000series:
+		s = "28000 series"
+	case NDPChassis23000series:
+		s = "23000 series"
+	case NDPChassis5DN00xseries:
+		s = "5DN00x series"
+	case NDPChassisBayStackEthernet:
+		s = "BayStack Ethernet"
+	case NDPChassis23100series:
+		s = "23100 series"
+	case NDPChassis100BaseTHub:
+		s = "100Base-T Hub"
+	case NDPChassis3000FastEthernet:
+		s = "3000 Fast Ethernet"
+	case NDPChassisOrionSwitch:
+		s = "Orion switch"
+	case NDPChassisDDS:
+		s = "DDS"
+	case NDPChassisCentillion6slot:
+		s = "Centillion (6 slot)"
+	case NDPChassisCentillion12slot:
+		s = "Centillion (12 slot)"
+	case NDPChassisCentillion1slot:
+		s = "Centillion (1 slot)"
+	case NDPChassisBayStack301:
+		s = "BayStack 301"
+	case NDPChassisBayStackTokenRingHub:
+		s = "BayStack TokenRing Hub"
+	case NDPChassisFVCMultimediaSwitch:
+		s = "FVC Multimedia Switch"
+	case NDPChassisSwitchNode:
+		s = "Switch Node"
+	case NDPChassisBayStack302Switch:
+		s = "BayStack 302 Switch"
+	case NDPChassisBayStack350Switch:
+		s = "BayStack 350 Switch"
+	case NDPChassisBayStack150EthernetHub:
+		s = "BayStack 150 Ethernet Hub"
+	case NDPChassisCentillion50NSwitch:
+		s = "Centillion 50N switch"
+	case NDPChassisCentillion50TSwitch:
+		s = "Centillion 50T switch"
+	case NDPChassisBayStack303304Switches:
+		s = "BayStack 303 and 304 Switches"
+	case NDPChassisBayStack200EthernetHub:
+		s = "BayStack 200 Ethernet Hub"
+	case NDPChassisBayStack25010100EthernetHub:
+		s = "BayStack 250 10/100 Ethernet Hub"
+	case NDPChassisBayStack450101001000Switches:
+		s = "BayStack 450 10/100/1000 Switches"
+	case NDPChassisBayStack41010100Switches:
+		s = "BayStack 410 10/100 Switches"
+	case NDPChassisPassport1200L3Switch:
+		s = "Passport 1200 L3 Switch"
+	case NDPChassisPassport1250L3Switch:
+		s = "Passport 1250 L3 Switch"
+	case NDPChassisPassport1100L3Switch:
+		s = "Passport 1100 L3 Switch"
+	case NDPChassisPassport1150L3Switch:
+		s = "Passport 1150 L3 Switch"
+	case NDPChassisPassport1050L3Switch:
+		s = "Passport 1050 L3 Switch"
+	case NDPChassisPassport1051L3Switch:
+		s = "Passport 1051 L3 Switch"
+	case NDPChassisPassport8610L3Switch:
+		s = "Passport 8610 L3 Switch"
+	case NDPChassisPassport8606L3Switch:
+		s = "Passport 8606 L3 Switch"
+	case NDPChassisPassport8010:
+		s = "Passport 8010"
+	case NDPChassisPassport8006:
+		s = "Passport 8006"
+	case NDPChassisBayStack670wirelessaccesspoint:
+		s = "BayStack 670 wireless access point"
+	case NDPChassisPassport740:
+		s = "Passport 740"
+	case NDPChassisPassport750:
+		s = "Passport 750"
+	case NDPChassisPassport790:
+		s = "Passport 790"
+	case NDPChassisBusinessPolicySwitch200010100Switches:
+		s = "Business Policy Switch 2000 10/100 Switches"
+	case NDPChassisPassport8110L2Switch:
+		s = "Passport 8110 L2 Switch"
+	case NDPChassisPassport8106L2Switch:
+		s = "Passport 8106 L2 Switch"
+	case NDPChassisBayStack3580GigSwitch:
+		s = "BayStack 3580 Gig Switch"
+	case NDPChassisBayStack10PowerSupplyUnit:
+		s = "BayStack 10 Power Supply Unit"
+	case NDPChassisBayStack42010100Switch:
+		s = "BayStack 420 10/100 Switch"
+	case NDPChassisOPTeraMetro1200EthernetServiceModule:
+		s = "OPTera Metro 1200 Ethernet Service Module"
+	case NDPChassisOPTera8010co:
+		s = "OPTera 8010co"
+	case NDPChassisOPTera8610coL3Switch:
+		s = "OPTera 8610co L3 switch"
+	case NDPChassisOPTera8110coL2Switch:
+		s = "OPTera 8110co L2 switch"
+	case NDPChassisOPTera8003:
+		s = "OPTera 8003"
+	case NDPChassisOPTera8603L3Switch:
+		s = "OPTera 8603 L3 switch"
+	case NDPChassisOPTera8103L2Switch:
+		s = "OPTera 8103 L2 switch"
+	case NDPChassisBayStack380101001000Switch:
+		s = "BayStack 380 10/100/1000 Switch"
+	case NDPChassisEthernetSwitch47048T:
+		s = "Ethernet Switch 470-48T"
+	case NDPChassisOPTeraMetro1450EthernetServiceModule:
+		s = "OPTera Metro 1450 Ethernet Service Module"
+	case NDPChassisOPTeraMetro1400EthernetServiceModule:
+		s = "OPTera Metro 1400 Ethernet Service Module"
+	case NDPChassisAlteonSwitchFamily:
+		s = "Alteon Switch Family"
+	case NDPChassisEthernetSwitch46024TPWR:
+		s = "Ethernet Switch 460-24T-PWR"
+	case NDPChassisOPTeraMetro8010OPML2Switch:
+		s = "OPTera Metro 8010 OPM L2 Switch"
+	case NDPChassisOPTeraMetro8010coOPML2Switch:
+		s = "OPTera Metro 8010co OPM L2 Switch"
+	case NDPChassisOPTeraMetro8006OPML2Switch:
+		s = "OPTera Metro 8006 OPM L2 Switch"
+	case NDPChassisOPTeraMetro8003OPML2Switch:
+		s = "OPTera Metro 8003 OPM L2 Switch"
+	case NDPChassisAlteon180e:
+		s = "Alteon 180e"
+	case NDPChassisAlteonAD3:
+		s = "Alteon AD3"
+	case NDPChassisAlteon184:
+		s = "Alteon 184"
+	case NDPChassisAlteonAD4:
+		s = "Alteon AD4"
+	case NDPChassisPassport1424L3Switch:
+		s = "Passport 1424 L3 switch"
+	case NDPChassisPassport1648L3Switch:
+		s = "Passport 1648 L3 switch"
+	case NDPChassisPassport1612L3Switch:
+		s = "Passport 1612 L3 switch"
+	case NDPChassisPassport1624L3Switch:
+		s = "Passport 1624 L3 switch"
+	case NDPChassisBayStack38024FFiber1000Switch:
+		s = "BayStack 380-24F Fiber 1000 Switch"
+	case NDPChassisEthernetRoutingSwitch551024T:
+		s = "Ethernet Routing Switch 5510-24T"
+	case NDPChassisEthernetRoutingSwitch551048T:
+		s = "Ethernet Routing Switch 5510-48T"
+	case NDPChassisEthernetSwitch47024T:
+		s = "Ethernet Switch 470-24T"
+	case NDPChassisNortelNetworksWirelessLANAccessPoint2220:
+		s = "Nortel Networks Wireless LAN Access Point 2220"
+	case NDPChassisPassportRBS2402L3Switch:
+		s = "Passport RBS 2402 L3 switch"
+	case NDPChassisAlteonApplicationSwitch2424:
+		s = "Alteon Application Switch 2424"
+	case NDPChassisAlteonApplicationSwitch2224:
+		s = "Alteon Application Switch 2224"
+	case NDPChassisAlteonApplicationSwitch2208:
+		s = "Alteon Application Switch 2208"
+	case NDPChassisAlteonApplicationSwitch2216:
+		s = "Alteon Application Switch 2216"
+	case NDPChassisAlteonApplicationSwitch3408:
+		s = "Alteon Application Switch 3408"
+	case NDPChassisAlteonApplicationSwitch3416:
+		s = "Alteon Application Switch 3416"
+	case NDPChassisNortelNetworksWirelessLANSecuritySwitch2250:
+		s = "Nortel Networks Wireless LAN SecuritySwitch 2250"
+	case NDPChassisEthernetSwitch42548T:
+		s = "Ethernet Switch 425-48T"
+	case NDPChassisEthernetSwitch42524T:
+		s = "Ethernet Switch 425-24T"
+	case NDPChassisNortelNetworksWirelessLANAccessPoint2221:
+		s = "Nortel Networks Wireless LAN Access Point 2221"
+	case NDPChassisNortelMetroEthernetServiceUnit24TSPFswitch:
+		s = "Nortel Metro Ethernet Service Unit 24-T SPF switch"
+	case NDPChassisNortelMetroEthernetServiceUnit24TLXDCswitch:
+		s = " Nortel Metro Ethernet Service Unit 24-T LX DC switch"
+	case NDPChassisPassport830010slotchassis:
+		s = "Passport 8300 10-slot chassis"
+	case NDPChassisPassport83006slotchassis:
+		s = "Passport 8300 6-slot chassis"
+	case NDPChassisEthernetRoutingSwitch552024TPWR:
+		s = "Ethernet Routing Switch 5520-24T-PWR"
+	case NDPChassisEthernetRoutingSwitch552048TPWR:
+		s = "Ethernet Routing Switch 5520-48T-PWR"
+	case NDPChassisNortelNetworksVPNGateway3050:
+		s = "Nortel Networks VPN Gateway 3050"
+	case NDPChassisAlteonSSL31010100:
+		s = "Alteon SSL 310 10/100"
+	case NDPChassisAlteonSSL31010100Fiber:
+		s = "Alteon SSL 310 10/100 Fiber"
+	case NDPChassisAlteonSSL31010100FIPS:
+		s = "Alteon SSL 310 10/100 FIPS"
+	case NDPChassisAlteonSSL410101001000:
+		s = "Alteon SSL 410 10/100/1000"
+	case NDPChassisAlteonSSL410101001000Fiber:
+		s = "Alteon SSL 410 10/100/1000 Fiber"
+	case NDPChassisAlteonApplicationSwitch2424SSL:
+		s = "Alteon Application Switch 2424-SSL"
+	case NDPChassisEthernetSwitch32524T:
+		s = "Ethernet Switch 325-24T"
+	case NDPChassisEthernetSwitch32524G:
+		s = "Ethernet Switch 325-24G"
+	case NDPChassisNortelNetworksWirelessLANAccessPoint2225:
+		s = "Nortel Networks Wireless LAN Access Point 2225"
+	case NDPChassisNortelNetworksWirelessLANSecuritySwitch2270:
+		s = "Nortel Networks Wireless LAN SecuritySwitch 2270"
+	case NDPChassis24portEthernetSwitch47024TPWR:
+		s = "24-port Ethernet Switch 470-24T-PWR"
+	case NDPChassis48portEthernetSwitch47048TPWR:
+		s = "48-port Ethernet Switch 470-48T-PWR"
+	case NDPChassisEthernetRoutingSwitch553024TFD:
+		s = "Ethernet Routing Switch 5530-24TFD"
+	case NDPChassisEthernetSwitch351024T:
+		s = "Ethernet Switch 3510-24T"
+	case NDPChassisNortelMetroEthernetServiceUnit12GACL3Switch:
+		s = "Nortel Metro Ethernet Service Unit 12G AC L3 switch"
+	case NDPChassisNortelMetroEthernetServiceUnit12GDCL3Switch:
+		s = "Nortel Metro Ethernet Service Unit 12G DC L3 switch"
+	case NDPChassisNortelSecureAccessSwitch:
+		s = "Nortel Secure Access Switch"
+	case NDPChassisNortelNetworksVPNGateway3070:
+		s = "Nortel Networks VPN Gateway 3070"
+	case NDPChassisOPTeraMetro3500:
+		s = "OPTera Metro 3500"
+	case NDPChassisSMBBES101024T:
+		s = "SMB BES 1010 24T"
+	case NDPChassisSMBBES101048T:
+		s = "SMB BES 1010 48T"
+	case NDPChassisSMBBES102024TPWR:
+		s = "SMB BES 1020 24T PWR"
+	case NDPChassisSMBBES102048TPWR:
+		s = "SMB BES 1020 48T PWR"
+	case NDPChassisSMBBES201024T:
+		s = "SMB BES 2010 24T"
+	case NDPChassisSMBBES201048T:
+		s = "SMB BES 2010 48T"
+	case NDPChassisSMBBES202024TPWR:
+		s = "SMB BES 2020 24T PWR"
+	case NDPChassisSMBBES202048TPWR:
+		s = "SMB BES 2020 48T PWR"
+	case NDPChassisSMBBES11024T:
+		s = "SMB BES 110 24T"
+	case NDPChassisSMBBES11048T:
+		s = "SMB BES 110 48T"
+	case NDPChassisSMBBES12024TPWR:
+		s = "SMB BES 120 24T PWR"
+	case NDPChassisSMBBES12048TPWR:
+		s = "SMB BES 120 48T PWR"
+	case NDPChassisSMBBES21024T:
+		s = "SMB BES 210 24T"
+	case NDPChassisSMBBES21048T:
+		s = "SMB BES 210 48T"
+	case NDPChassisSMBBES22024TPWR:
+		s = "SMB BES 220 24T PWR"
+	case NDPChassisSMBBES22048TPWR:
+		s = "SMB BES 220 48T PWR"
+	case NDPChassisOME6500:
+		s = "OME 6500"
+	case NDPChassisEthernetRoutingSwitch4548GT:
+		s = "Ethernet Routing Switch 4548GT"
+	case NDPChassisEthernetRoutingSwitch4548GTPWR:
+		s = "Ethernet Routing Switch 4548GT-PWR"
+	case NDPChassisEthernetRoutingSwitch4550T:
+		s = "Ethernet Routing Switch 4550T"
+	case NDPChassisEthernetRoutingSwitch4550TPWR:
+		s = "Ethernet Routing Switch 4550T-PWR"
+	case NDPChassisEthernetRoutingSwitch4526FX:
+		s = "Ethernet Routing Switch 4526FX"
+	case NDPChassisEthernetRoutingSwitch250026T:
+		s = "Ethernet Routing Switch 2500-26T"
+	case NDPChassisEthernetRoutingSwitch250026TPWR:
+		s = "Ethernet Routing Switch 2500-26T-PWR"
+	case NDPChassisEthernetRoutingSwitch250050T:
+		s = "Ethernet Routing Switch 2500-50T"
+	case NDPChassisEthernetRoutingSwitch250050TPWR:
+		s = "Ethernet Routing Switch 2500-50T-PWR"
+	default:
+		s = "Unknown"
+	}
+	return
+}
+
+func (t NDPBackplaneType) String() (s string) {
+	switch t {
+	case NDPBackplaneOther:
+		s = "Other"
+	case NDPBackplaneEthernet:
+		s = "Ethernet"
+	case NDPBackplaneEthernetTokenring:
+		s = "Ethernet and Tokenring"
+	case NDPBackplaneEthernetFDDI:
+		s = "Ethernet and FDDI"
+	case NDPBackplaneEthernetTokenringFDDI:
+		s = "Ethernet, Tokenring and FDDI"
+	case NDPBackplaneEthernetTokenringRedundantPower:
+		s = "Ethernet and Tokenring with redundant power"
+	case NDPBackplaneEthernetTokenringFDDIRedundantPower:
+		s = "Ethernet, Tokenring, FDDI with redundant power"
+	case NDPBackplaneTokenRing:
+		s = "Token Ring"
+	case NDPBackplaneEthernetTokenringFastEthernet:
+		s = "Ethernet, Tokenring and Fast Ethernet"
+	case NDPBackplaneEthernetFastEthernet:
+		s = "Ethernet and Fast Ethernet"
+	case NDPBackplaneEthernetTokenringFastEthernetRedundantPower:
+		s = "Ethernet, Tokenring, Fast Ethernet with redundant power"
+	case NDPBackplaneEthernetFastEthernetGigabitEthernet:
+		s = "Ethernet, Fast Ethernet and Gigabit Ethernet"
+	default:
+		s = "Unknown"
+	}
+	return
+}
+
+func (t NDPState) String() (s string) {
+	switch t {
+	case NDPStateTopology:
+		s = "Topology Change"
+	case NDPStateHeartbeat:
+		s = "Heartbeat"
+	case NDPStateNew:
+		s = "New"
+	default:
+		s = "Unknown"
+	}
+	return
+}

vendor/github.com/google/gopacket/layers/ntp.go

@@ -0,0 +1,416 @@
+// Copyright 2016 Google, Inc. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+//
+//******************************************************************************
+
+package layers
+
+import (
+	"encoding/binary"
+	"errors"
+
+	"github.com/google/gopacket"
+)
+
+//******************************************************************************
+//
+// Network Time Protocol (NTP) Decoding Layer
+// ------------------------------------------
+// This file provides a GoPacket decoding layer for NTP.
+//
+//******************************************************************************
+//
+// About The Network Time Protocol (NTP)
+// -------------------------------------
+// NTP is a protocol that enables computers on the internet to set their
+// clocks to the correct time (or to a time that is acceptably close to the
+// correct time). NTP runs on top of UDP.
+//
+// There have been a series of versions of the NTP protocol. The latest
+// version is V4 and is specified in RFC 5905:
+//     http://www.ietf.org/rfc/rfc5905.txt
+//
+//******************************************************************************
+//
+// References
+// ----------
+//
+// Wikipedia's NTP entry:
+//     https://en.wikipedia.org/wiki/Network_Time_Protocol
+//     This is the best place to get an overview of NTP.
+//
+// Network Time Protocol Home Website:
+//     http://www.ntp.org/
+//     This appears to be the official website of NTP.
+//
+// List of current NTP Protocol RFCs:
+//     http://www.ntp.org/rfc.html
+//
+// RFC 958: "Network Time Protocol (NTP)" (1985)
+//     https://tools.ietf.org/html/rfc958
+//     This is the original NTP specification.
+//
+// RFC 1305: "Network Time Protocol (Version 3) Specification, Implementation and Analysis" (1992)
+//     https://tools.ietf.org/html/rfc1305
+//     The protocol was updated in 1992 yielding NTP V3.
+//
+// RFC 5905: "Network Time Protocol Version 4: Protocol and Algorithms Specification" (2010)
+//     https://www.ietf.org/rfc/rfc5905.txt
+//     The protocol was updated in 2010 yielding NTP V4.
+//     V4 is backwards compatible with all previous versions of NTP.
+//
+// RFC 5906: "Network Time Protocol Version 4: Autokey Specification"
+//     https://tools.ietf.org/html/rfc5906
+//     This document addresses the security of the NTP protocol
+//     and is probably not relevant to this package.
+//
+// RFC 5907: "Definitions of Managed Objects for Network Time Protocol Version 4 (NTPv4)"
+//     https://tools.ietf.org/html/rfc5907
+//     This document addresses the management of NTP servers and
+//     is probably not relevant to this package.
+//
+// RFC 5908: "Network Time Protocol (NTP) Server Option for DHCPv6"
+//     https://tools.ietf.org/html/rfc5908
+//     This document addresses the use of NTP in DHCPv6 and is
+//     probably not relevant to this package.
+//
+// "Let's make a NTP Client in C"
+//     https://lettier.github.io/posts/2016-04-26-lets-make-a-ntp-client-in-c.html
+//     This web page contains useful information about the details of NTP,
+//     including an NTP record struture in C, and C code.
+//
+// "NTP Packet Header (NTP Reference Implementation) (Computer Network Time Synchronization)"
+//     http://what-when-how.com/computer-network-time-synchronization/
+//        ntp-packet-header-ntp-reference-implementation-computer-network-time-synchronization/
+//     This web page contains useful information on the details of NTP.
+//
+// "Technical information - NTP Data Packet"
+//     https://www.meinbergglobal.com/english/info/ntp-packet.htm
+//     This page has a helpful diagram of an NTP V4 packet.
+//
+//******************************************************************************
+//
+// Obsolete References
+// -------------------
+//
+// RFC 1119: "RFC-1119 "Network Time Protocol (Version 2) Specification and Implementation" (1989)
+//     https://tools.ietf.org/html/rfc1119
+//     Version 2 was drafted in 1989.
+//     It is unclear whether V2 was ever implememented or whether the
+//     ideas ended up in V3 (which was implemented in 1992).
+//
+// RFC 1361: "Simple Network Time Protocol (SNTP)"
+//     https://tools.ietf.org/html/rfc1361
+//     This document is obsoleted by RFC 1769 and is included only for completeness.
+//
+// RFC 1769: "Simple Network Time Protocol (SNTP)"
+//     https://tools.ietf.org/html/rfc1769
+//     This document is obsoleted by RFC 2030 and RFC 4330 and is included only for completeness.
+//
+// RFC 2030: "Simple Network Time Protocol (SNTP) Version 4 for IPv4, IPv6 and OSI"
+//     https://tools.ietf.org/html/rfc2030
+//     This document is obsoleted by RFC 4330 and is included only for completeness.
+//
+// RFC 4330: "Simple Network Time Protocol (SNTP) Version 4 for IPv4, IPv6 and OSI"
+//     https://tools.ietf.org/html/rfc4330
+//     This document is obsoleted by RFC 5905 and is included only for completeness.
+//
+//******************************************************************************
+//
+// Endian And Bit Numbering Issues
+// -------------------------------
+//
+// Endian and bit numbering issues can be confusing. Here is some
+// clarification:
+//
+//    ENDIAN: Values are sent big endian.
+//    https://en.wikipedia.org/wiki/Endianness
+//
+//    BIT NUMBERING: Bits are numbered 0 upwards from the most significant
+//    bit to the least significant bit. This means that if there is a 32-bit
+//    value, the most significant bit is called bit 0 and the least
+//    significant bit is called bit 31.
+//
+// See RFC 791 Appendix B for more discussion.
+//
+//******************************************************************************
+//
+// NTP V3 and V4 Packet Format
+// ---------------------------
+// NTP packets are UDP packets whose payload contains an NTP record.
+//
+// The NTP RFC defines the format of the NTP record.
+//
+// There have been four versions of the protocol:
+//
+//    V1 in 1985
+//    V2 in 1989
+//    V3 in 1992
+//    V4 in 2010
+//
+// It is clear that V1 and V2 are obsolete, and there is no need to
+// cater for these formats.
+//
+// V3 and V4 essentially use the same format, with V4 adding some optional
+// fields on the end. So this package supports the V3 and V4 formats.
+//
+// The current version of NTP (NTP V4)'s RFC (V4 - RFC 5905) contains
+// the following diagram for the NTP record format:
+
+//      0                   1                   2                   3
+//      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+//     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//     |LI | VN  |Mode |    Stratum    |     Poll      |   Precision   |
+//     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//     |                         Root Delay                            |
+//     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//     |                         Root Dispersion                       |
+//     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//     |                          Reference ID                         |
+//     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//     |                                                               |
+//     +                     Reference Timestamp (64)                  +
+//     |                                                               |
+//     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//     |                                                               |
+//     +                      Origin Timestamp (64)                    +
+//     |                                                               |
+//     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//     |                                                               |
+//     +                      Receive Timestamp (64)                   +
+//     |                                                               |
+//     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//     |                                                               |
+//     +                      Transmit Timestamp (64)                  +
+//     |                                                               |
+//     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//     |                                                               |
+//     .                                                               .
+//     .                    Extension Field 1 (variable)               .
+//     .                                                               .
+//     |                                                               |
+//     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//     |                                                               |
+//     .                                                               .
+//     .                    Extension Field 2 (variable)               .
+//     .                                                               .
+//     |                                                               |
+//     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//     |                          Key Identifier                       |
+//     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//     |                                                               |
+//     |                            dgst (128)                         |
+//     |                                                               |
+//     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+//     From http://www.ietf.org/rfc/rfc5905.txt
+//
+// The fields "Extension Field 1 (variable)" and later are optional fields,
+// and so we can set a minimum NTP record size of 48 bytes.
+//
+const ntpMinimumRecordSizeInBytes int = 48
+
+//******************************************************************************
+
+// NTP Type
+// --------
+// Type NTP implements the DecodingLayer interface. Each NTP object
+// represents in a structured form the NTP record present as the UDP
+// payload in an NTP UDP packet.
+//
+
+type NTPLeapIndicator uint8
+type NTPVersion uint8
+type NTPMode uint8
+type NTPStratum uint8
+type NTPLog2Seconds int8
+type NTPFixed16Seconds uint32
+type NTPReferenceID uint32
+type NTPTimestamp uint64
+
+type NTP struct {
+	BaseLayer // Stores the packet bytes and payload bytes.
+
+	LeapIndicator      NTPLeapIndicator  // [0,3]. Indicates whether leap second(s) is to be added.
+	Version            NTPVersion        // [0,7]. Version of the NTP protocol.
+	Mode               NTPMode           // [0,7]. Mode.
+	Stratum            NTPStratum        // [0,255]. Stratum of time server in the server tree.
+	Poll               NTPLog2Seconds    // [-128,127]. The maximum interval between successive messages, in log2 seconds.
+	Precision          NTPLog2Seconds    // [-128,127]. The precision of the system clock, in log2 seconds.
+	RootDelay          NTPFixed16Seconds // [0,2^32-1]. Total round trip delay to the reference clock in seconds times 2^16.
+	RootDispersion     NTPFixed16Seconds // [0,2^32-1]. Total dispersion to the reference clock, in seconds times 2^16.
+	ReferenceID        NTPReferenceID    // ID code of reference clock [0,2^32-1].
+	ReferenceTimestamp NTPTimestamp      // Most recent timestamp from the reference clock.
+	OriginTimestamp    NTPTimestamp      // Local time when request was sent from local host.
+	ReceiveTimestamp   NTPTimestamp      // Local time (on server) that request arrived at server host.
+	TransmitTimestamp  NTPTimestamp      // Local time (on server) that request departed server host.
+
+	// FIX: This package should analyse the extension fields and represent the extension fields too.
+	ExtensionBytes []byte // Just put extensions in a byte slice.
+}
+
+//******************************************************************************
+
+// LayerType returns the layer type of the NTP object, which is LayerTypeNTP.
+func (d *NTP) LayerType() gopacket.LayerType {
+	return LayerTypeNTP
+}
+
+//******************************************************************************
+
+// decodeNTP analyses a byte slice and attempts to decode it as an NTP
+// record of a UDP packet.
+//
+// If it succeeds, it loads p with information about the packet and returns nil.
+// If it fails, it returns an error (non nil).
+//
+// This function is employed in layertypes.go to register the NTP layer.
+func decodeNTP(data []byte, p gopacket.PacketBuilder) error {
+
+	// Attempt to decode the byte slice.
+	d := &NTP{}
+	err := d.DecodeFromBytes(data, p)
+	if err != nil {
+		return err
+	}
+
+	// If the decoding worked, add the layer to the packet and set it
+	// as the application layer too, if there isn't already one.
+	p.AddLayer(d)
+	p.SetApplicationLayer(d)
+
+	return nil
+}
+
+//******************************************************************************
+
+// DecodeFromBytes analyses a byte slice and attempts to decode it as an NTP
+// record of a UDP packet.
+//
+// Upon succeeds, it loads the NTP object with information about the packet
+// and returns nil.
+// Upon failure, it returns an error (non nil).
+func (d *NTP) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+
+	// If the data block is too short to be a NTP record, then return an error.
+	if len(data) < ntpMinimumRecordSizeInBytes {
+		df.SetTruncated()
+		return errors.New("NTP packet too short")
+	}
+
+	// RFC 5905 does not appear to define a maximum NTP record length.
+	// The protocol allows "extension fields" to be included in the record,
+	// and states about these fields:"
+	//
+	//     "While the minimum field length containing required fields is
+	//      four words (16 octets), a maximum field length remains to be
+	//      established."
+	//
+	// For this reason, the packet length is not checked here for being too long.
+
+	// NTP type embeds type BaseLayer which contains two fields:
+	//    Contents is supposed to contain the bytes of the data at this level.
+	//    Payload is supposed to contain the payload of this level.
+	// Here we set the baselayer to be the bytes of the NTP record.
+	d.BaseLayer = BaseLayer{Contents: data[:len(data)]}
+
+	// Extract the fields from the block of bytes.
+	// To make sense of this, refer to the packet diagram
+	// above and the section on endian conventions.
+
+	// The first few fields are all packed into the first 32 bits. Unpack them.
+	f := data[0]
+	d.LeapIndicator = NTPLeapIndicator((f & 0xC0) >> 6)
+	d.Version = NTPVersion((f & 0x38) >> 3)
+	d.Mode = NTPMode(f & 0x07)
+	d.Stratum = NTPStratum(data[1])
+	d.Poll = NTPLog2Seconds(data[2])
+	d.Precision = NTPLog2Seconds(data[3])
+
+	// The remaining fields can just be copied in big endian order.
+	d.RootDelay = NTPFixed16Seconds(binary.BigEndian.Uint32(data[4:8]))
+	d.RootDispersion = NTPFixed16Seconds(binary.BigEndian.Uint32(data[8:12]))
+	d.ReferenceID = NTPReferenceID(binary.BigEndian.Uint32(data[12:16]))
+	d.ReferenceTimestamp = NTPTimestamp(binary.BigEndian.Uint64(data[16:24]))
+	d.OriginTimestamp = NTPTimestamp(binary.BigEndian.Uint64(data[24:32]))
+	d.ReceiveTimestamp = NTPTimestamp(binary.BigEndian.Uint64(data[32:40]))
+	d.TransmitTimestamp = NTPTimestamp(binary.BigEndian.Uint64(data[40:48]))
+
+	// This layer does not attempt to analyse the extension bytes.
+	// But if there are any, we'd like the user to know. So we just
+	// place them all in an ExtensionBytes field.
+	d.ExtensionBytes = data[48:]
+
+	// Return no error.
+	return nil
+}
+
+// SerializeTo writes the serialized form of this layer into the
+// SerializationBuffer, implementing gopacket.SerializableLayer.
+// See the docs for gopacket.SerializableLayer for more info.
+func (d *NTP) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	data, err := b.PrependBytes(ntpMinimumRecordSizeInBytes)
+	if err != nil {
+		return err
+	}
+
+	// Pack the first few fields into the first 32 bits.
+	h := uint8(0)
+	h |= (uint8(d.LeapIndicator) << 6) & 0xC0
+	h |= (uint8(d.Version) << 3) & 0x38
+	h |= (uint8(d.Mode)) & 0x07
+	data[0] = byte(h)
+	data[1] = byte(d.Stratum)
+	data[2] = byte(d.Poll)
+	data[3] = byte(d.Precision)
+
+	// The remaining fields can just be copied in big endian order.
+	binary.BigEndian.PutUint32(data[4:8], uint32(d.RootDelay))
+	binary.BigEndian.PutUint32(data[8:12], uint32(d.RootDispersion))
+	binary.BigEndian.PutUint32(data[12:16], uint32(d.ReferenceID))
+	binary.BigEndian.PutUint64(data[16:24], uint64(d.ReferenceTimestamp))
+	binary.BigEndian.PutUint64(data[24:32], uint64(d.OriginTimestamp))
+	binary.BigEndian.PutUint64(data[32:40], uint64(d.ReceiveTimestamp))
+	binary.BigEndian.PutUint64(data[40:48], uint64(d.TransmitTimestamp))
+
+	ex, err := b.AppendBytes(len(d.ExtensionBytes))
+	if err != nil {
+		return err
+	}
+	copy(ex, d.ExtensionBytes)
+
+	return nil
+}
+
+//******************************************************************************
+
+// CanDecode returns a set of layers that NTP objects can decode.
+// As NTP objects can only decide the NTP layer, we can return just that layer.
+// Apparently a single layer type implements LayerClass.
+func (d *NTP) CanDecode() gopacket.LayerClass {
+	return LayerTypeNTP
+}
+
+//******************************************************************************
+
+// NextLayerType specifies the next layer that GoPacket should attempt to
+// analyse after this (NTP) layer. As NTP packets do not contain any payload
+// bytes, there are no further layers to analyse.
+func (d *NTP) NextLayerType() gopacket.LayerType {
+	return gopacket.LayerTypeZero
+}
+
+//******************************************************************************
+
+// NTP packets do not carry any data payload, so the empty byte slice is retured.
+// In Go, a nil slice is functionally identical to an empty slice, so we
+// return nil to avoid a heap allocation.
+func (d *NTP) Payload() []byte {
+	return nil
+}
+
+//******************************************************************************
+//*                            End Of NTP File                                 *
+//******************************************************************************

vendor/github.com/google/gopacket/layers/ospf.go

@@ -0,0 +1,715 @@
+// Copyright 2017 Google, Inc. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+package layers
+
+import (
+	"encoding/binary"
+	"errors"
+	"fmt"
+
+	"github.com/google/gopacket"
+)
+
+// OSPFType denotes what kind of OSPF type it is
+type OSPFType uint8
+
+// Potential values for OSPF.Type.
+const (
+	OSPFHello                   OSPFType = 1
+	OSPFDatabaseDescription     OSPFType = 2
+	OSPFLinkStateRequest        OSPFType = 3
+	OSPFLinkStateUpdate         OSPFType = 4
+	OSPFLinkStateAcknowledgment OSPFType = 5
+)
+
+// LSA Function Codes for LSAheader.LSType
+const (
+	RouterLSAtypeV2         = 0x1
+	RouterLSAtype           = 0x2001
+	NetworkLSAtypeV2        = 0x2
+	NetworkLSAtype          = 0x2002
+	SummaryLSANetworktypeV2 = 0x3
+	InterAreaPrefixLSAtype  = 0x2003
+	SummaryLSAASBRtypeV2    = 0x4
+	InterAreaRouterLSAtype  = 0x2004
+	ASExternalLSAtypeV2     = 0x5
+	ASExternalLSAtype       = 0x4005
+	NSSALSAtype             = 0x2007
+	NSSALSAtypeV2           = 0x7
+	LinkLSAtype             = 0x0008
+	IntraAreaPrefixLSAtype  = 0x2009
+)
+
+// String conversions for OSPFType
+func (i OSPFType) String() string {
+	switch i {
+	case OSPFHello:
+		return "Hello"
+	case OSPFDatabaseDescription:
+		return "Database Description"
+	case OSPFLinkStateRequest:
+		return "Link State Request"
+	case OSPFLinkStateUpdate:
+		return "Link State Update"
+	case OSPFLinkStateAcknowledgment:
+		return "Link State Acknowledgment"
+	default:
+		return ""
+	}
+}
+
+// Prefix extends IntraAreaPrefixLSA
+type Prefix struct {
+	PrefixLength  uint8
+	PrefixOptions uint8
+	Metric        uint16
+	AddressPrefix []byte
+}
+
+// IntraAreaPrefixLSA is the struct from RFC 5340  A.4.10.
+type IntraAreaPrefixLSA struct {
+	NumOfPrefixes  uint16
+	RefLSType      uint16
+	RefLinkStateID uint32
+	RefAdvRouter   uint32
+	Prefixes       []Prefix
+}
+
+// LinkLSA is the struct from RFC 5340  A.4.9.
+type LinkLSA struct {
+	RtrPriority      uint8
+	Options          uint32
+	LinkLocalAddress []byte
+	NumOfPrefixes    uint32
+	Prefixes         []Prefix
+}
+
+// ASExternalLSAV2 is the struct from RFC 2328  A.4.5.
+type ASExternalLSAV2 struct {
+	NetworkMask       uint32
+	ExternalBit       uint8
+	Metric            uint32
+	ForwardingAddress uint32
+	ExternalRouteTag  uint32
+}
+
+// ASExternalLSA is the struct from RFC 5340  A.4.7.
+type ASExternalLSA struct {
+	Flags             uint8
+	Metric            uint32
+	PrefixLength      uint8
+	PrefixOptions     uint8
+	RefLSType         uint16
+	AddressPrefix     []byte
+	ForwardingAddress []byte
+	ExternalRouteTag  uint32
+	RefLinkStateID    uint32
+}
+
+// InterAreaRouterLSA is the struct from RFC 5340  A.4.6.
+type InterAreaRouterLSA struct {
+	Options             uint32
+	Metric              uint32
+	DestinationRouterID uint32
+}
+
+// InterAreaPrefixLSA is the struct from RFC 5340  A.4.5.
+type InterAreaPrefixLSA struct {
+	Metric        uint32
+	PrefixLength  uint8
+	PrefixOptions uint8
+	AddressPrefix []byte
+}
+
+// NetworkLSA is the struct from RFC 5340  A.4.4.
+type NetworkLSA struct {
+	Options        uint32
+	AttachedRouter []uint32
+}
+
+// NetworkLSAV2 is the struct from RFC 2328  A.4.3.
+type NetworkLSAV2 struct {
+	NetworkMask    uint32
+	AttachedRouter []uint32
+}
+
+// RouterV2 extends RouterLSAV2
+type RouterV2 struct {
+	Type     uint8
+	LinkID   uint32
+	LinkData uint32
+	Metric   uint16
+}
+
+// RouterLSAV2 is the struct from RFC 2328  A.4.2.
+type RouterLSAV2 struct {
+	Flags   uint8
+	Links   uint16
+	Routers []RouterV2
+}
+
+// Router extends RouterLSA
+type Router struct {
+	Type                uint8
+	Metric              uint16
+	InterfaceID         uint32
+	NeighborInterfaceID uint32
+	NeighborRouterID    uint32
+}
+
+// RouterLSA is the struct from RFC 5340  A.4.3.
+type RouterLSA struct {
+	Flags   uint8
+	Options uint32
+	Routers []Router
+}
+
+// LSAheader is the struct from RFC 5340  A.4.2 and RFC 2328 A.4.1.
+type LSAheader struct {
+	LSAge       uint16
+	LSType      uint16
+	LinkStateID uint32
+	AdvRouter   uint32
+	LSSeqNumber uint32
+	LSChecksum  uint16
+	Length      uint16
+	LSOptions   uint8
+}
+
+// LSA links LSAheader with the structs from RFC 5340  A.4.
+type LSA struct {
+	LSAheader
+	Content interface{}
+}
+
+// LSUpdate is the struct from RFC 5340  A.3.5.
+type LSUpdate struct {
+	NumOfLSAs uint32
+	LSAs      []LSA
+}
+
+// LSReq is the struct from RFC 5340  A.3.4.
+type LSReq struct {
+	LSType    uint16
+	LSID      uint32
+	AdvRouter uint32
+}
+
+// DbDescPkg is the struct from RFC 5340  A.3.3.
+type DbDescPkg struct {
+	Options      uint32
+	InterfaceMTU uint16
+	Flags        uint16
+	DDSeqNumber  uint32
+	LSAinfo      []LSAheader
+}
+
+// HelloPkg  is the struct from RFC 5340  A.3.2.
+type HelloPkg struct {
+	InterfaceID              uint32
+	RtrPriority              uint8
+	Options                  uint32
+	HelloInterval            uint16
+	RouterDeadInterval       uint32
+	DesignatedRouterID       uint32
+	BackupDesignatedRouterID uint32
+	NeighborID               []uint32
+}
+
+// HelloPkgV2 extends the HelloPkg struct with OSPFv2 information
+type HelloPkgV2 struct {
+	HelloPkg
+	NetworkMask uint32
+}
+
+// OSPF is a basic OSPF packet header with common fields of Version 2 and Version 3.
+type OSPF struct {
+	Version      uint8
+	Type         OSPFType
+	PacketLength uint16
+	RouterID     uint32
+	AreaID       uint32
+	Checksum     uint16
+	Content      interface{}
+}
+
+//OSPFv2 extend the OSPF head with version 2 specific fields
+type OSPFv2 struct {
+	BaseLayer
+	OSPF
+	AuType         uint16
+	Authentication uint64
+}
+
+// OSPFv3 extend the OSPF head with version 3 specific fields
+type OSPFv3 struct {
+	BaseLayer
+	OSPF
+	Instance uint8
+	Reserved uint8
+}
+
+// getLSAsv2 parses the LSA information from the packet for OSPFv2
+func getLSAsv2(num uint32, data []byte) ([]LSA, error) {
+	var lsas []LSA
+	var i uint32 = 0
+	var offset uint32 = 0
+	for ; i < num; i++ {
+		lstype := uint16(data[offset+3])
+		lsalength := binary.BigEndian.Uint16(data[offset+18 : offset+20])
+		content, err := extractLSAInformation(lstype, lsalength, data[offset:])
+		if err != nil {
+			return nil, fmt.Errorf("Could not extract Link State type.")
+		}
+		lsa := LSA{
+			LSAheader: LSAheader{
+				LSAge:       binary.BigEndian.Uint16(data[offset : offset+2]),
+				LSOptions:   data[offset+2],
+				LSType:      lstype,
+				LinkStateID: binary.BigEndian.Uint32(data[offset+4 : offset+8]),
+				AdvRouter:   binary.BigEndian.Uint32(data[offset+8 : offset+12]),
+				LSSeqNumber: binary.BigEndian.Uint32(data[offset+12 : offset+16]),
+				LSChecksum:  binary.BigEndian.Uint16(data[offset+16 : offset+18]),
+				Length:      lsalength,
+			},
+			Content: content,
+		}
+		lsas = append(lsas, lsa)
+		offset += uint32(lsalength)
+	}
+	return lsas, nil
+}
+
+// extractLSAInformation extracts all the LSA information
+func extractLSAInformation(lstype, lsalength uint16, data []byte) (interface{}, error) {
+	if lsalength < 20 {
+		return nil, fmt.Errorf("Link State header length %v too short, %v required", lsalength, 20)
+	}
+	if len(data) < int(lsalength) {
+		return nil, fmt.Errorf("Link State header length %v too short, %v required", len(data), lsalength)
+	}
+	var content interface{}
+	switch lstype {
+	case RouterLSAtypeV2:
+		var routers []RouterV2
+		var j uint32
+		for j = 24; j < uint32(lsalength); j += 12 {
+			if len(data) < int(j+12) {
+				return nil, errors.New("LSAtypeV2 too small")
+			}
+			router := RouterV2{
+				LinkID:   binary.BigEndian.Uint32(data[j : j+4]),
+				LinkData: binary.BigEndian.Uint32(data[j+4 : j+8]),
+				Type:     uint8(data[j+8]),
+				Metric:   binary.BigEndian.Uint16(data[j+10 : j+12]),
+			}
+			routers = append(routers, router)
+		}
+		if len(data) < 24 {
+			return nil, errors.New("LSAtypeV2 too small")
+		}
+		links := binary.BigEndian.Uint16(data[22:24])
+		content = RouterLSAV2{
+			Flags:   data[20],
+			Links:   links,
+			Routers: routers,
+		}
+	case NSSALSAtypeV2:
+		fallthrough
+	case ASExternalLSAtypeV2:
+		content = ASExternalLSAV2{
+			NetworkMask:       binary.BigEndian.Uint32(data[20:24]),
+			ExternalBit:       data[24] & 0x80,
+			Metric:            binary.BigEndian.Uint32(data[24:28]) & 0x00FFFFFF,
+			ForwardingAddress: binary.BigEndian.Uint32(data[28:32]),
+			ExternalRouteTag:  binary.BigEndian.Uint32(data[32:36]),
+		}
+	case NetworkLSAtypeV2:
+		var routers []uint32
+		var j uint32
+		for j = 24; j < uint32(lsalength); j += 4 {
+			routers = append(routers, binary.BigEndian.Uint32(data[j:j+4]))
+		}
+		content = NetworkLSAV2{
+			NetworkMask:    binary.BigEndian.Uint32(data[20:24]),
+			AttachedRouter: routers,
+		}
+	case RouterLSAtype:
+		var routers []Router
+		var j uint32
+		for j = 24; j < uint32(lsalength); j += 16 {
+			router := Router{
+				Type:                uint8(data[j]),
+				Metric:              binary.BigEndian.Uint16(data[j+2 : j+4]),
+				InterfaceID:         binary.BigEndian.Uint32(data[j+4 : j+8]),
+				NeighborInterfaceID: binary.BigEndian.Uint32(data[j+8 : j+12]),
+				NeighborRouterID:    binary.BigEndian.Uint32(data[j+12 : j+16]),
+			}
+			routers = append(routers, router)
+		}
+		content = RouterLSA{
+			Flags:   uint8(data[20]),
+			Options: binary.BigEndian.Uint32(data[20:24]) & 0x00FFFFFF,
+			Routers: routers,
+		}
+	case NetworkLSAtype:
+		var routers []uint32
+		var j uint32
+		for j = 24; j < uint32(lsalength); j += 4 {
+			routers = append(routers, binary.BigEndian.Uint32(data[j:j+4]))
+		}
+		content = NetworkLSA{
+			Options:        binary.BigEndian.Uint32(data[20:24]) & 0x00FFFFFF,
+			AttachedRouter: routers,
+		}
+	case InterAreaPrefixLSAtype:
+		content = InterAreaPrefixLSA{
+			Metric:        binary.BigEndian.Uint32(data[20:24]) & 0x00FFFFFF,
+			PrefixLength:  uint8(data[24]),
+			PrefixOptions: uint8(data[25]),
+			AddressPrefix: data[28:uint32(lsalength)],
+		}
+	case InterAreaRouterLSAtype:
+		content = InterAreaRouterLSA{
+			Options:             binary.BigEndian.Uint32(data[20:24]) & 0x00FFFFFF,
+			Metric:              binary.BigEndian.Uint32(data[24:28]) & 0x00FFFFFF,
+			DestinationRouterID: binary.BigEndian.Uint32(data[28:32]),
+		}
+	case ASExternalLSAtype:
+		fallthrough
+	case NSSALSAtype:
+		flags := uint8(data[20])
+		prefixLen := uint8(data[24]) / 8
+		var forwardingAddress []byte
+		if (flags & 0x02) == 0x02 {
+			forwardingAddress = data[28+uint32(prefixLen) : 28+uint32(prefixLen)+16]
+		}
+		content = ASExternalLSA{
+			Flags:             flags,
+			Metric:            binary.BigEndian.Uint32(data[20:24]) & 0x00FFFFFF,
+			PrefixLength:      prefixLen,
+			PrefixOptions:     uint8(data[25]),
+			RefLSType:         binary.BigEndian.Uint16(data[26:28]),
+			AddressPrefix:     data[28 : 28+uint32(prefixLen)],
+			ForwardingAddress: forwardingAddress,
+		}
+	case LinkLSAtype:
+		var prefixes []Prefix
+		var prefixOffset uint32 = 44
+		var j uint32
+		numOfPrefixes := binary.BigEndian.Uint32(data[40:44])
+		for j = 0; j < numOfPrefixes; j++ {
+			prefixLen := uint8(data[prefixOffset])
+			prefix := Prefix{
+				PrefixLength:  prefixLen,
+				PrefixOptions: uint8(data[prefixOffset+1]),
+				AddressPrefix: data[prefixOffset+4 : prefixOffset+4+uint32(prefixLen)/8],
+			}
+			prefixes = append(prefixes, prefix)
+			prefixOffset = prefixOffset + 4 + uint32(prefixLen)/8
+		}
+		content = LinkLSA{
+			RtrPriority:      uint8(data[20]),
+			Options:          binary.BigEndian.Uint32(data[20:24]) & 0x00FFFFFF,
+			LinkLocalAddress: data[24:40],
+			NumOfPrefixes:    numOfPrefixes,
+			Prefixes:         prefixes,
+		}
+	case IntraAreaPrefixLSAtype:
+		var prefixes []Prefix
+		var prefixOffset uint32 = 32
+		var j uint16
+		numOfPrefixes := binary.BigEndian.Uint16(data[20:22])
+		for j = 0; j < numOfPrefixes; j++ {
+			prefixLen := uint8(data[prefixOffset])
+			prefix := Prefix{
+				PrefixLength:  prefixLen,
+				PrefixOptions: uint8(data[prefixOffset+1]),
+				Metric:        binary.BigEndian.Uint16(data[prefixOffset+2 : prefixOffset+4]),
+				AddressPrefix: data[prefixOffset+4 : prefixOffset+4+uint32(prefixLen)/8],
+			}
+			prefixes = append(prefixes, prefix)
+			prefixOffset = prefixOffset + 4 + uint32(prefixLen)
+		}
+		content = IntraAreaPrefixLSA{
+			NumOfPrefixes:  numOfPrefixes,
+			RefLSType:      binary.BigEndian.Uint16(data[22:24]),
+			RefLinkStateID: binary.BigEndian.Uint32(data[24:28]),
+			RefAdvRouter:   binary.BigEndian.Uint32(data[28:32]),
+			Prefixes:       prefixes,
+		}
+	default:
+		return nil, fmt.Errorf("Unknown Link State type.")
+	}
+	return content, nil
+}
+
+// getLSAs parses the LSA information from the packet for OSPFv3
+func getLSAs(num uint32, data []byte) ([]LSA, error) {
+	var lsas []LSA
+	var i uint32 = 0
+	var offset uint32 = 0
+	for ; i < num; i++ {
+		var content interface{}
+		lstype := binary.BigEndian.Uint16(data[offset+2 : offset+4])
+		lsalength := binary.BigEndian.Uint16(data[offset+18 : offset+20])
+
+		content, err := extractLSAInformation(lstype, lsalength, data[offset:])
+		if err != nil {
+			return nil, fmt.Errorf("Could not extract Link State type.")
+		}
+		lsa := LSA{
+			LSAheader: LSAheader{
+				LSAge:       binary.BigEndian.Uint16(data[offset : offset+2]),
+				LSType:      lstype,
+				LinkStateID: binary.BigEndian.Uint32(data[offset+4 : offset+8]),
+				AdvRouter:   binary.BigEndian.Uint32(data[offset+8 : offset+12]),
+				LSSeqNumber: binary.BigEndian.Uint32(data[offset+12 : offset+16]),
+				LSChecksum:  binary.BigEndian.Uint16(data[offset+16 : offset+18]),
+				Length:      lsalength,
+			},
+			Content: content,
+		}
+		lsas = append(lsas, lsa)
+		offset += uint32(lsalength)
+	}
+	return lsas, nil
+}
+
+// DecodeFromBytes decodes the given bytes into the OSPF layer.
+func (ospf *OSPFv2) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+	if len(data) < 24 {
+		return fmt.Errorf("Packet too smal for OSPF Version 2")
+	}
+
+	ospf.Version = uint8(data[0])
+	ospf.Type = OSPFType(data[1])
+	ospf.PacketLength = binary.BigEndian.Uint16(data[2:4])
+	ospf.RouterID = binary.BigEndian.Uint32(data[4:8])
+	ospf.AreaID = binary.BigEndian.Uint32(data[8:12])
+	ospf.Checksum = binary.BigEndian.Uint16(data[12:14])
+	ospf.AuType = binary.BigEndian.Uint16(data[14:16])
+	ospf.Authentication = binary.BigEndian.Uint64(data[16:24])
+
+	switch ospf.Type {
+	case OSPFHello:
+		var neighbors []uint32
+		for i := 44; uint16(i+4) <= ospf.PacketLength; i += 4 {
+			neighbors = append(neighbors, binary.BigEndian.Uint32(data[i:i+4]))
+		}
+		ospf.Content = HelloPkgV2{
+			NetworkMask: binary.BigEndian.Uint32(data[24:28]),
+			HelloPkg: HelloPkg{
+				HelloInterval:            binary.BigEndian.Uint16(data[28:30]),
+				Options:                  uint32(data[30]),
+				RtrPriority:              uint8(data[31]),
+				RouterDeadInterval:       binary.BigEndian.Uint32(data[32:36]),
+				DesignatedRouterID:       binary.BigEndian.Uint32(data[36:40]),
+				BackupDesignatedRouterID: binary.BigEndian.Uint32(data[40:44]),
+				NeighborID:               neighbors,
+			},
+		}
+	case OSPFDatabaseDescription:
+		var lsas []LSAheader
+		for i := 32; uint16(i+20) <= ospf.PacketLength; i += 20 {
+			lsa := LSAheader{
+				LSAge:       binary.BigEndian.Uint16(data[i : i+2]),
+				LSType:      binary.BigEndian.Uint16(data[i+2 : i+4]),
+				LinkStateID: binary.BigEndian.Uint32(data[i+4 : i+8]),
+				AdvRouter:   binary.BigEndian.Uint32(data[i+8 : i+12]),
+				LSSeqNumber: binary.BigEndian.Uint32(data[i+12 : i+16]),
+				LSChecksum:  binary.BigEndian.Uint16(data[i+16 : i+18]),
+				Length:      binary.BigEndian.Uint16(data[i+18 : i+20]),
+			}
+			lsas = append(lsas, lsa)
+		}
+		ospf.Content = DbDescPkg{
+			InterfaceMTU: binary.BigEndian.Uint16(data[24:26]),
+			Options:      uint32(data[26]),
+			Flags:        uint16(data[27]),
+			DDSeqNumber:  binary.BigEndian.Uint32(data[28:32]),
+			LSAinfo:      lsas,
+		}
+	case OSPFLinkStateRequest:
+		var lsrs []LSReq
+		for i := 24; uint16(i+12) <= ospf.PacketLength; i += 12 {
+			lsr := LSReq{
+				LSType:    binary.BigEndian.Uint16(data[i+2 : i+4]),
+				LSID:      binary.BigEndian.Uint32(data[i+4 : i+8]),
+				AdvRouter: binary.BigEndian.Uint32(data[i+8 : i+12]),
+			}
+			lsrs = append(lsrs, lsr)
+		}
+		ospf.Content = lsrs
+	case OSPFLinkStateUpdate:
+		num := binary.BigEndian.Uint32(data[24:28])
+
+		lsas, err := getLSAsv2(num, data[28:])
+		if err != nil {
+			return fmt.Errorf("Cannot parse Link State Update packet: %v", err)
+		}
+		ospf.Content = LSUpdate{
+			NumOfLSAs: num,
+			LSAs:      lsas,
+		}
+	case OSPFLinkStateAcknowledgment:
+		var lsas []LSAheader
+		for i := 24; uint16(i+20) <= ospf.PacketLength; i += 20 {
+			lsa := LSAheader{
+				LSAge:       binary.BigEndian.Uint16(data[i : i+2]),
+				LSOptions:   data[i+2],
+				LSType:      uint16(data[i+3]),
+				LinkStateID: binary.BigEndian.Uint32(data[i+4 : i+8]),
+				AdvRouter:   binary.BigEndian.Uint32(data[i+8 : i+12]),
+				LSSeqNumber: binary.BigEndian.Uint32(data[i+12 : i+16]),
+				LSChecksum:  binary.BigEndian.Uint16(data[i+16 : i+18]),
+				Length:      binary.BigEndian.Uint16(data[i+18 : i+20]),
+			}
+			lsas = append(lsas, lsa)
+		}
+		ospf.Content = lsas
+	}
+	return nil
+}
+
+// DecodeFromBytes decodes the given bytes into the OSPF layer.
+func (ospf *OSPFv3) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+
+	if len(data) < 16 {
+		return fmt.Errorf("Packet too smal for OSPF Version 3")
+	}
+
+	ospf.Version = uint8(data[0])
+	ospf.Type = OSPFType(data[1])
+	ospf.PacketLength = binary.BigEndian.Uint16(data[2:4])
+	ospf.RouterID = binary.BigEndian.Uint32(data[4:8])
+	ospf.AreaID = binary.BigEndian.Uint32(data[8:12])
+	ospf.Checksum = binary.BigEndian.Uint16(data[12:14])
+	ospf.Instance = uint8(data[14])
+	ospf.Reserved = uint8(data[15])
+
+	switch ospf.Type {
+	case OSPFHello:
+		var neighbors []uint32
+		for i := 36; uint16(i+4) <= ospf.PacketLength; i += 4 {
+			neighbors = append(neighbors, binary.BigEndian.Uint32(data[i:i+4]))
+		}
+		ospf.Content = HelloPkg{
+			InterfaceID:              binary.BigEndian.Uint32(data[16:20]),
+			RtrPriority:              uint8(data[20]),
+			Options:                  binary.BigEndian.Uint32(data[21:25]) >> 8,
+			HelloInterval:            binary.BigEndian.Uint16(data[24:26]),
+			RouterDeadInterval:       uint32(binary.BigEndian.Uint16(data[26:28])),
+			DesignatedRouterID:       binary.BigEndian.Uint32(data[28:32]),
+			BackupDesignatedRouterID: binary.BigEndian.Uint32(data[32:36]),
+			NeighborID:               neighbors,
+		}
+	case OSPFDatabaseDescription:
+		var lsas []LSAheader
+		for i := 28; uint16(i+20) <= ospf.PacketLength; i += 20 {
+			lsa := LSAheader{
+				LSAge:       binary.BigEndian.Uint16(data[i : i+2]),
+				LSType:      binary.BigEndian.Uint16(data[i+2 : i+4]),
+				LinkStateID: binary.BigEndian.Uint32(data[i+4 : i+8]),
+				AdvRouter:   binary.BigEndian.Uint32(data[i+8 : i+12]),
+				LSSeqNumber: binary.BigEndian.Uint32(data[i+12 : i+16]),
+				LSChecksum:  binary.BigEndian.Uint16(data[i+16 : i+18]),
+				Length:      binary.BigEndian.Uint16(data[i+18 : i+20]),
+			}
+			lsas = append(lsas, lsa)
+		}
+		ospf.Content = DbDescPkg{
+			Options:      binary.BigEndian.Uint32(data[16:20]) & 0x00FFFFFF,
+			InterfaceMTU: binary.BigEndian.Uint16(data[20:22]),
+			Flags:        binary.BigEndian.Uint16(data[22:24]),
+			DDSeqNumber:  binary.BigEndian.Uint32(data[24:28]),
+			LSAinfo:      lsas,
+		}
+	case OSPFLinkStateRequest:
+		var lsrs []LSReq
+		for i := 16; uint16(i+12) <= ospf.PacketLength; i += 12 {
+			lsr := LSReq{
+				LSType:    binary.BigEndian.Uint16(data[i+2 : i+4]),
+				LSID:      binary.BigEndian.Uint32(data[i+4 : i+8]),
+				AdvRouter: binary.BigEndian.Uint32(data[i+8 : i+12]),
+			}
+			lsrs = append(lsrs, lsr)
+		}
+		ospf.Content = lsrs
+	case OSPFLinkStateUpdate:
+		num := binary.BigEndian.Uint32(data[16:20])
+		lsas, err := getLSAs(num, data[20:])
+		if err != nil {
+			return fmt.Errorf("Cannot parse Link State Update packet: %v", err)
+		}
+		ospf.Content = LSUpdate{
+			NumOfLSAs: num,
+			LSAs:      lsas,
+		}
+
+	case OSPFLinkStateAcknowledgment:
+		var lsas []LSAheader
+		for i := 16; uint16(i+20) <= ospf.PacketLength; i += 20 {
+			lsa := LSAheader{
+				LSAge:       binary.BigEndian.Uint16(data[i : i+2]),
+				LSType:      binary.BigEndian.Uint16(data[i+2 : i+4]),
+				LinkStateID: binary.BigEndian.Uint32(data[i+4 : i+8]),
+				AdvRouter:   binary.BigEndian.Uint32(data[i+8 : i+12]),
+				LSSeqNumber: binary.BigEndian.Uint32(data[i+12 : i+16]),
+				LSChecksum:  binary.BigEndian.Uint16(data[i+16 : i+18]),
+				Length:      binary.BigEndian.Uint16(data[i+18 : i+20]),
+			}
+			lsas = append(lsas, lsa)
+		}
+		ospf.Content = lsas
+	default:
+	}
+
+	return nil
+}
+
+// LayerType returns LayerTypeOSPF
+func (ospf *OSPFv2) LayerType() gopacket.LayerType {
+	return LayerTypeOSPF
+}
+func (ospf *OSPFv3) LayerType() gopacket.LayerType {
+	return LayerTypeOSPF
+}
+
+// NextLayerType returns the layer type contained by this DecodingLayer.
+func (ospf *OSPFv2) NextLayerType() gopacket.LayerType {
+	return gopacket.LayerTypeZero
+}
+func (ospf *OSPFv3) NextLayerType() gopacket.LayerType {
+	return gopacket.LayerTypeZero
+}
+
+// CanDecode returns the set of layer types that this DecodingLayer can decode.
+func (ospf *OSPFv2) CanDecode() gopacket.LayerClass {
+	return LayerTypeOSPF
+}
+func (ospf *OSPFv3) CanDecode() gopacket.LayerClass {
+	return LayerTypeOSPF
+}
+
+func decodeOSPF(data []byte, p gopacket.PacketBuilder) error {
+	if len(data) < 14 {
+		return fmt.Errorf("Packet too smal for OSPF")
+	}
+
+	switch uint8(data[0]) {
+	case 2:
+		ospf := &OSPFv2{}
+		return decodingLayerDecoder(ospf, data, p)
+	case 3:
+		ospf := &OSPFv3{}
+		return decodingLayerDecoder(ospf, data, p)
+	default:
+	}
+
+	return fmt.Errorf("Unable to determine OSPF type.")
+}

vendor/github.com/google/gopacket/layers/pflog.go

@@ -0,0 +1,84 @@
+// Copyright 2012 Google, Inc. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+package layers
+
+import (
+	"encoding/binary"
+	"errors"
+	"fmt"
+
+	"github.com/google/gopacket"
+)
+
+type PFDirection uint8
+
+const (
+	PFDirectionInOut PFDirection = 0
+	PFDirectionIn    PFDirection = 1
+	PFDirectionOut   PFDirection = 2
+)
+
+// PFLog provides the layer for 'pf' packet-filter logging, as described at
+// http://www.freebsd.org/cgi/man.cgi?query=pflog&sektion=4
+type PFLog struct {
+	BaseLayer
+	Length              uint8
+	Family              ProtocolFamily
+	Action, Reason      uint8
+	IFName, Ruleset     []byte
+	RuleNum, SubruleNum uint32
+	UID                 uint32
+	PID                 int32
+	RuleUID             uint32
+	RulePID             int32
+	Direction           PFDirection
+	// The remainder is padding
+}
+
+func (pf *PFLog) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+	if len(data) < 60 {
+		df.SetTruncated()
+		return errors.New("PFLog data less than 60 bytes")
+	}
+	pf.Length = data[0]
+	pf.Family = ProtocolFamily(data[1])
+	pf.Action = data[2]
+	pf.Reason = data[3]
+	pf.IFName = data[4:20]
+	pf.Ruleset = data[20:36]
+	pf.RuleNum = binary.BigEndian.Uint32(data[36:40])
+	pf.SubruleNum = binary.BigEndian.Uint32(data[40:44])
+	pf.UID = binary.BigEndian.Uint32(data[44:48])
+	pf.PID = int32(binary.BigEndian.Uint32(data[48:52]))
+	pf.RuleUID = binary.BigEndian.Uint32(data[52:56])
+	pf.RulePID = int32(binary.BigEndian.Uint32(data[56:60]))
+	pf.Direction = PFDirection(data[60])
+	if pf.Length%4 != 1 {
+		return errors.New("PFLog header length should be 3 less than multiple of 4")
+	}
+	actualLength := int(pf.Length) + 3
+	if len(data) < actualLength {
+		return fmt.Errorf("PFLog data size < %d", actualLength)
+	}
+	pf.Contents = data[:actualLength]
+	pf.Payload = data[actualLength:]
+	return nil
+}
+
+// LayerType returns layers.LayerTypePFLog
+func (pf *PFLog) LayerType() gopacket.LayerType { return LayerTypePFLog }
+
+func (pf *PFLog) CanDecode() gopacket.LayerClass { return LayerTypePFLog }
+
+func (pf *PFLog) NextLayerType() gopacket.LayerType {
+	return pf.Family.LayerType()
+}
+
+func decodePFLog(data []byte, p gopacket.PacketBuilder) error {
+	pf := &PFLog{}
+	return decodingLayerDecoder(pf, data, p)
+}

vendor/github.com/google/gopacket/layers/ports.go

@@ -0,0 +1,156 @@
+// Copyright 2012 Google, Inc. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+package layers
+
+import (
+	"fmt"
+	"strconv"
+
+	"github.com/google/gopacket"
+)
+
+// TCPPort is a port in a TCP layer.
+type TCPPort uint16
+
+// UDPPort is a port in a UDP layer.
+type UDPPort uint16
+
+// RUDPPort is a port in a RUDP layer.
+type RUDPPort uint8
+
+// SCTPPort is a port in a SCTP layer.
+type SCTPPort uint16
+
+// UDPLitePort is a port in a UDPLite layer.
+type UDPLitePort uint16
+
+// RUDPPortNames contains the string names for all RUDP ports.
+var RUDPPortNames = map[RUDPPort]string{}
+
+// UDPLitePortNames contains the string names for all UDPLite ports.
+var UDPLitePortNames = map[UDPLitePort]string{}
+
+// {TCP,UDP,SCTP}PortNames can be found in iana_ports.go
+
+// String returns the port as "number(name)" if there's a well-known port name,
+// or just "number" if there isn't.  Well-known names are stored in
+// TCPPortNames.
+func (a TCPPort) String() string {
+	if name, ok := TCPPortNames[a]; ok {
+		return fmt.Sprintf("%d(%s)", a, name)
+	}
+	return strconv.Itoa(int(a))
+}
+
+// LayerType returns a LayerType that would be able to decode the
+// application payload. It uses some well-known ports such as 53 for
+// DNS.
+//
+// Returns gopacket.LayerTypePayload for unknown/unsupported port numbers.
+func (a TCPPort) LayerType() gopacket.LayerType {
+	lt := tcpPortLayerType[uint16(a)]
+	if lt != 0 {
+		return lt
+	}
+	return gopacket.LayerTypePayload
+}
+
+var tcpPortLayerType = [65536]gopacket.LayerType{
+	53:   LayerTypeDNS,
+	443:  LayerTypeTLS,       // https
+	502:  LayerTypeModbusTCP, // modbustcp
+	636:  LayerTypeTLS,       // ldaps
+	989:  LayerTypeTLS,       // ftps-data
+	990:  LayerTypeTLS,       // ftps
+	992:  LayerTypeTLS,       // telnets
+	993:  LayerTypeTLS,       // imaps
+	994:  LayerTypeTLS,       // ircs
+	995:  LayerTypeTLS,       // pop3s
+	5061: LayerTypeTLS,       // ips
+}
+
+// RegisterTCPPortLayerType creates a new mapping between a TCPPort
+// and an underlaying LayerType.
+func RegisterTCPPortLayerType(port TCPPort, layerType gopacket.LayerType) {
+	tcpPortLayerType[port] = layerType
+}
+
+// String returns the port as "number(name)" if there's a well-known port name,
+// or just "number" if there isn't.  Well-known names are stored in
+// UDPPortNames.
+func (a UDPPort) String() string {
+	if name, ok := UDPPortNames[a]; ok {
+		return fmt.Sprintf("%d(%s)", a, name)
+	}
+	return strconv.Itoa(int(a))
+}
+
+// LayerType returns a LayerType that would be able to decode the
+// application payload. It uses some well-known ports such as 53 for
+// DNS.
+//
+// Returns gopacket.LayerTypePayload for unknown/unsupported port numbers.
+func (a UDPPort) LayerType() gopacket.LayerType {
+	lt := udpPortLayerType[uint16(a)]
+	if lt != 0 {
+		return lt
+	}
+	return gopacket.LayerTypePayload
+}
+
+var udpPortLayerType = [65536]gopacket.LayerType{
+	53:   LayerTypeDNS,
+	123:  LayerTypeNTP,
+	4789: LayerTypeVXLAN,
+	67:   LayerTypeDHCPv4,
+	68:   LayerTypeDHCPv4,
+	546:  LayerTypeDHCPv6,
+	547:  LayerTypeDHCPv6,
+	5060: LayerTypeSIP,
+	6343: LayerTypeSFlow,
+	6081: LayerTypeGeneve,
+	3784: LayerTypeBFD,
+	2152: LayerTypeGTPv1U,
+	623:  LayerTypeRMCP,
+	1812: LayerTypeRADIUS,
+}
+
+// RegisterUDPPortLayerType creates a new mapping between a UDPPort
+// and an underlaying LayerType.
+func RegisterUDPPortLayerType(port UDPPort, layerType gopacket.LayerType) {
+	udpPortLayerType[port] = layerType
+}
+
+// String returns the port as "number(name)" if there's a well-known port name,
+// or just "number" if there isn't.  Well-known names are stored in
+// RUDPPortNames.
+func (a RUDPPort) String() string {
+	if name, ok := RUDPPortNames[a]; ok {
+		return fmt.Sprintf("%d(%s)", a, name)
+	}
+	return strconv.Itoa(int(a))
+}
+
+// String returns the port as "number(name)" if there's a well-known port name,
+// or just "number" if there isn't.  Well-known names are stored in
+// SCTPPortNames.
+func (a SCTPPort) String() string {
+	if name, ok := SCTPPortNames[a]; ok {
+		return fmt.Sprintf("%d(%s)", a, name)
+	}
+	return strconv.Itoa(int(a))
+}
+
+// String returns the port as "number(name)" if there's a well-known port name,
+// or just "number" if there isn't.  Well-known names are stored in
+// UDPLitePortNames.
+func (a UDPLitePort) String() string {
+	if name, ok := UDPLitePortNames[a]; ok {
+		return fmt.Sprintf("%d(%s)", a, name)
+	}
+	return strconv.Itoa(int(a))
+}

vendor/github.com/google/gopacket/layers/ppp.go

@@ -0,0 +1,88 @@
+// Copyright 2012 Google, Inc. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+package layers
+
+import (
+	"encoding/binary"
+	"errors"
+	"github.com/google/gopacket"
+)
+
+// PPP is the layer for PPP encapsulation headers.
+type PPP struct {
+	BaseLayer
+	PPPType       PPPType
+	HasPPTPHeader bool
+}
+
+// PPPEndpoint is a singleton endpoint for PPP.  Since there is no actual
+// addressing for the two ends of a PPP connection, we use a singleton value
+// named 'point' for each endpoint.
+var PPPEndpoint = gopacket.NewEndpoint(EndpointPPP, nil)
+
+// PPPFlow is a singleton flow for PPP.  Since there is no actual addressing for
+// the two ends of a PPP connection, we use a singleton value to represent the
+// flow for all PPP connections.
+var PPPFlow = gopacket.NewFlow(EndpointPPP, nil, nil)
+
+// LayerType returns LayerTypePPP
+func (p *PPP) LayerType() gopacket.LayerType { return LayerTypePPP }
+
+// LinkFlow returns PPPFlow.
+func (p *PPP) LinkFlow() gopacket.Flow { return PPPFlow }
+
+func decodePPP(data []byte, p gopacket.PacketBuilder) error {
+	ppp := &PPP{}
+	offset := 0
+	if data[0] == 0xff && data[1] == 0x03 {
+		offset = 2
+		ppp.HasPPTPHeader = true
+	}
+	if data[offset]&0x1 == 0 {
+		if data[offset+1]&0x1 == 0 {
+			return errors.New("PPP has invalid type")
+		}
+		ppp.PPPType = PPPType(binary.BigEndian.Uint16(data[offset : offset+2]))
+		ppp.Contents = data[offset : offset+2]
+		ppp.Payload = data[offset+2:]
+	} else {
+		ppp.PPPType = PPPType(data[offset])
+		ppp.Contents = data[offset : offset+1]
+		ppp.Payload = data[offset+1:]
+	}
+	p.AddLayer(ppp)
+	p.SetLinkLayer(ppp)
+	return p.NextDecoder(ppp.PPPType)
+}
+
+// SerializeTo writes the serialized form of this layer into the
+// SerializationBuffer, implementing gopacket.SerializableLayer.
+// See the docs for gopacket.SerializableLayer for more info.
+func (p *PPP) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	if p.PPPType&0x100 == 0 {
+		bytes, err := b.PrependBytes(2)
+		if err != nil {
+			return err
+		}
+		binary.BigEndian.PutUint16(bytes, uint16(p.PPPType))
+	} else {
+		bytes, err := b.PrependBytes(1)
+		if err != nil {
+			return err
+		}
+		bytes[0] = uint8(p.PPPType)
+	}
+	if p.HasPPTPHeader {
+		bytes, err := b.PrependBytes(2)
+		if err != nil {
+			return err
+		}
+		bytes[0] = 0xff
+		bytes[1] = 0x03
+	}
+	return nil
+}

vendor/github.com/google/gopacket/layers/pppoe.go

@@ -0,0 +1,60 @@
+// Copyright 2012 Google, Inc. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+package layers
+
+import (
+	"encoding/binary"
+	"github.com/google/gopacket"
+)
+
+// PPPoE is the layer for PPPoE encapsulation headers.
+type PPPoE struct {
+	BaseLayer
+	Version   uint8
+	Type      uint8
+	Code      PPPoECode
+	SessionId uint16
+	Length    uint16
+}
+
+// LayerType returns gopacket.LayerTypePPPoE.
+func (p *PPPoE) LayerType() gopacket.LayerType {
+	return LayerTypePPPoE
+}
+
+// decodePPPoE decodes the PPPoE header (see http://tools.ietf.org/html/rfc2516).
+func decodePPPoE(data []byte, p gopacket.PacketBuilder) error {
+	pppoe := &PPPoE{
+		Version:   data[0] >> 4,
+		Type:      data[0] & 0x0F,
+		Code:      PPPoECode(data[1]),
+		SessionId: binary.BigEndian.Uint16(data[2:4]),
+		Length:    binary.BigEndian.Uint16(data[4:6]),
+	}
+	pppoe.BaseLayer = BaseLayer{data[:6], data[6 : 6+pppoe.Length]}
+	p.AddLayer(pppoe)
+	return p.NextDecoder(pppoe.Code)
+}
+
+// SerializeTo writes the serialized form of this layer into the
+// SerializationBuffer, implementing gopacket.SerializableLayer.
+// See the docs for gopacket.SerializableLayer for more info.
+func (p *PPPoE) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	payload := b.Bytes()
+	bytes, err := b.PrependBytes(6)
+	if err != nil {
+		return err
+	}
+	bytes[0] = (p.Version << 4) | p.Type
+	bytes[1] = byte(p.Code)
+	binary.BigEndian.PutUint16(bytes[2:], p.SessionId)
+	if opts.FixLengths {
+		p.Length = uint16(len(payload))
+	}
+	binary.BigEndian.PutUint16(bytes[4:], p.Length)
+	return nil
+}

vendor/github.com/google/gopacket/layers/prism.go

@@ -0,0 +1,146 @@
+// Copyright 2015 Google, Inc. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+// http://www.tcpdump.org/linktypes/LINKTYPE_IEEE802_11_PRISM.html
+
+package layers
+
+import (
+	"encoding/binary"
+	"errors"
+
+	"github.com/google/gopacket"
+)
+
+func decodePrismValue(data []byte, pv *PrismValue) {
+	pv.DID = PrismDID(binary.LittleEndian.Uint32(data[0:4]))
+	pv.Status = binary.LittleEndian.Uint16(data[4:6])
+	pv.Length = binary.LittleEndian.Uint16(data[6:8])
+	pv.Data = data[8 : 8+pv.Length]
+}
+
+type PrismDID uint32
+
+const (
+	PrismDIDType1HostTime                  PrismDID = 0x10044
+	PrismDIDType2HostTime                  PrismDID = 0x01041
+	PrismDIDType1MACTime                   PrismDID = 0x20044
+	PrismDIDType2MACTime                   PrismDID = 0x02041
+	PrismDIDType1Channel                   PrismDID = 0x30044
+	PrismDIDType2Channel                   PrismDID = 0x03041
+	PrismDIDType1RSSI                      PrismDID = 0x40044
+	PrismDIDType2RSSI                      PrismDID = 0x04041
+	PrismDIDType1SignalQuality             PrismDID = 0x50044
+	PrismDIDType2SignalQuality             PrismDID = 0x05041
+	PrismDIDType1Signal                    PrismDID = 0x60044
+	PrismDIDType2Signal                    PrismDID = 0x06041
+	PrismDIDType1Noise                     PrismDID = 0x70044
+	PrismDIDType2Noise                     PrismDID = 0x07041
+	PrismDIDType1Rate                      PrismDID = 0x80044
+	PrismDIDType2Rate                      PrismDID = 0x08041
+	PrismDIDType1TransmittedFrameIndicator PrismDID = 0x90044
+	PrismDIDType2TransmittedFrameIndicator PrismDID = 0x09041
+	PrismDIDType1FrameLength               PrismDID = 0xA0044
+	PrismDIDType2FrameLength               PrismDID = 0x0A041
+)
+
+const (
+	PrismType1MessageCode uint16 = 0x00000044
+	PrismType2MessageCode uint16 = 0x00000041
+)
+
+func (p PrismDID) String() string {
+	dids := map[PrismDID]string{
+		PrismDIDType1HostTime:                  "Host Time",
+		PrismDIDType2HostTime:                  "Host Time",
+		PrismDIDType1MACTime:                   "MAC Time",
+		PrismDIDType2MACTime:                   "MAC Time",
+		PrismDIDType1Channel:                   "Channel",
+		PrismDIDType2Channel:                   "Channel",
+		PrismDIDType1RSSI:                      "RSSI",
+		PrismDIDType2RSSI:                      "RSSI",
+		PrismDIDType1SignalQuality:             "Signal Quality",
+		PrismDIDType2SignalQuality:             "Signal Quality",
+		PrismDIDType1Signal:                    "Signal",
+		PrismDIDType2Signal:                    "Signal",
+		PrismDIDType1Noise:                     "Noise",
+		PrismDIDType2Noise:                     "Noise",
+		PrismDIDType1Rate:                      "Rate",
+		PrismDIDType2Rate:                      "Rate",
+		PrismDIDType1TransmittedFrameIndicator: "Transmitted Frame Indicator",
+		PrismDIDType2TransmittedFrameIndicator: "Transmitted Frame Indicator",
+		PrismDIDType1FrameLength:               "Frame Length",
+		PrismDIDType2FrameLength:               "Frame Length",
+	}
+
+	if str, ok := dids[p]; ok {
+		return str
+	}
+
+	return "Unknown DID"
+}
+
+type PrismValue struct {
+	DID    PrismDID
+	Status uint16
+	Length uint16
+	Data   []byte
+}
+
+func (pv *PrismValue) IsSupplied() bool {
+	return pv.Status == 1
+}
+
+var ErrPrismExpectedMoreData = errors.New("Expected more data.")
+var ErrPrismInvalidCode = errors.New("Invalid header code.")
+
+func decodePrismHeader(data []byte, p gopacket.PacketBuilder) error {
+	d := &PrismHeader{}
+	return decodingLayerDecoder(d, data, p)
+}
+
+type PrismHeader struct {
+	BaseLayer
+	Code       uint16
+	Length     uint16
+	DeviceName string
+	Values     []PrismValue
+}
+
+func (m *PrismHeader) LayerType() gopacket.LayerType { return LayerTypePrismHeader }
+
+func (m *PrismHeader) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+	m.Code = binary.LittleEndian.Uint16(data[0:4])
+	m.Length = binary.LittleEndian.Uint16(data[4:8])
+	m.DeviceName = string(data[8:24])
+	m.BaseLayer = BaseLayer{Contents: data[:m.Length], Payload: data[m.Length:len(data)]}
+
+	switch m.Code {
+	case PrismType1MessageCode:
+		fallthrough
+	case PrismType2MessageCode:
+		// valid message code
+	default:
+		return ErrPrismInvalidCode
+	}
+
+	offset := uint16(24)
+
+	m.Values = make([]PrismValue, (m.Length-offset)/12)
+	for i := 0; i < len(m.Values); i++ {
+		decodePrismValue(data[offset:offset+12], &m.Values[i])
+		offset += 12
+	}
+
+	if offset != m.Length {
+		return ErrPrismExpectedMoreData
+	}
+
+	return nil
+}
+
+func (m *PrismHeader) CanDecode() gopacket.LayerClass    { return LayerTypePrismHeader }
+func (m *PrismHeader) NextLayerType() gopacket.LayerType { return LayerTypeDot11 }

vendor/github.com/google/gopacket/layers/radius.go

@@ -0,0 +1,560 @@
+// Copyright 2020 The GoPacket Authors. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license that can be found
+// in the LICENSE file in the root of the source tree.
+
+package layers
+
+import (
+	"encoding/binary"
+	"fmt"
+
+	"github.com/google/gopacket"
+)
+
+const (
+	// RFC 2865 3.  Packet Format
+	// `The minimum length is 20 and maximum length is 4096.`
+	radiusMinimumRecordSizeInBytes int = 20
+	radiusMaximumRecordSizeInBytes int = 4096
+
+	// RFC 2865 5.  Attributes
+	// `The Length field is one octet, and indicates the length of this Attribute including the Type, Length and Value fields.`
+	// `The Value field is zero or more octets and contains information specific to the Attribute.`
+	radiusAttributesMinimumRecordSizeInBytes int = 2
+)
+
+// RADIUS represents a Remote Authentication Dial In User Service layer.
+type RADIUS struct {
+	BaseLayer
+
+	Code          RADIUSCode
+	Identifier    RADIUSIdentifier
+	Length        RADIUSLength
+	Authenticator RADIUSAuthenticator
+	Attributes    []RADIUSAttribute
+}
+
+// RADIUSCode represents packet type.
+type RADIUSCode uint8
+
+// constants that define RADIUSCode.
+const (
+	RADIUSCodeAccessRequest      RADIUSCode = 1   // RFC2865 3.  Packet Format
+	RADIUSCodeAccessAccept       RADIUSCode = 2   // RFC2865 3.  Packet Format
+	RADIUSCodeAccessReject       RADIUSCode = 3   // RFC2865 3.  Packet Format
+	RADIUSCodeAccountingRequest  RADIUSCode = 4   // RFC2865 3.  Packet Format
+	RADIUSCodeAccountingResponse RADIUSCode = 5   // RFC2865 3.  Packet Format
+	RADIUSCodeAccessChallenge    RADIUSCode = 11  // RFC2865 3.  Packet Format
+	RADIUSCodeStatusServer       RADIUSCode = 12  // RFC2865 3.  Packet Format (experimental)
+	RADIUSCodeStatusClient       RADIUSCode = 13  // RFC2865 3.  Packet Format (experimental)
+	RADIUSCodeReserved           RADIUSCode = 255 // RFC2865 3.  Packet Format
+)
+
+// String returns a string version of a RADIUSCode.
+func (t RADIUSCode) String() (s string) {
+	switch t {
+	case RADIUSCodeAccessRequest:
+		s = "Access-Request"
+	case RADIUSCodeAccessAccept:
+		s = "Access-Accept"
+	case RADIUSCodeAccessReject:
+		s = "Access-Reject"
+	case RADIUSCodeAccountingRequest:
+		s = "Accounting-Request"
+	case RADIUSCodeAccountingResponse:
+		s = "Accounting-Response"
+	case RADIUSCodeAccessChallenge:
+		s = "Access-Challenge"
+	case RADIUSCodeStatusServer:
+		s = "Status-Server"
+	case RADIUSCodeStatusClient:
+		s = "Status-Client"
+	case RADIUSCodeReserved:
+		s = "Reserved"
+	default:
+		s = fmt.Sprintf("Unknown(%d)", t)
+	}
+	return
+}
+
+// RADIUSIdentifier represents packet identifier.
+type RADIUSIdentifier uint8
+
+// RADIUSLength represents packet length.
+type RADIUSLength uint16
+
+// RADIUSAuthenticator represents authenticator.
+type RADIUSAuthenticator [16]byte
+
+// RADIUSAttribute represents attributes.
+type RADIUSAttribute struct {
+	Type   RADIUSAttributeType
+	Length RADIUSAttributeLength
+	Value  RADIUSAttributeValue
+}
+
+// RADIUSAttributeType represents attribute type.
+type RADIUSAttributeType uint8
+
+// constants that define RADIUSAttributeType.
+const (
+	RADIUSAttributeTypeUserName               RADIUSAttributeType = 1  // RFC2865  5.1.  User-Name
+	RADIUSAttributeTypeUserPassword           RADIUSAttributeType = 2  // RFC2865  5.2.  User-Password
+	RADIUSAttributeTypeCHAPPassword           RADIUSAttributeType = 3  // RFC2865  5.3.  CHAP-Password
+	RADIUSAttributeTypeNASIPAddress           RADIUSAttributeType = 4  // RFC2865  5.4.  NAS-IP-Address
+	RADIUSAttributeTypeNASPort                RADIUSAttributeType = 5  // RFC2865  5.5.  NAS-Port
+	RADIUSAttributeTypeServiceType            RADIUSAttributeType = 6  // RFC2865  5.6.  Service-Type
+	RADIUSAttributeTypeFramedProtocol         RADIUSAttributeType = 7  // RFC2865  5.7.  Framed-Protocol
+	RADIUSAttributeTypeFramedIPAddress        RADIUSAttributeType = 8  // RFC2865  5.8.  Framed-IP-Address
+	RADIUSAttributeTypeFramedIPNetmask        RADIUSAttributeType = 9  // RFC2865  5.9.  Framed-IP-Netmask
+	RADIUSAttributeTypeFramedRouting          RADIUSAttributeType = 10 // RFC2865 5.10.  Framed-Routing
+	RADIUSAttributeTypeFilterId               RADIUSAttributeType = 11 // RFC2865 5.11.  Filter-Id
+	RADIUSAttributeTypeFramedMTU              RADIUSAttributeType = 12 // RFC2865 5.12.  Framed-MTU
+	RADIUSAttributeTypeFramedCompression      RADIUSAttributeType = 13 // RFC2865 5.13.  Framed-Compression
+	RADIUSAttributeTypeLoginIPHost            RADIUSAttributeType = 14 // RFC2865 5.14.  Login-IP-Host
+	RADIUSAttributeTypeLoginService           RADIUSAttributeType = 15 // RFC2865 5.15.  Login-Service
+	RADIUSAttributeTypeLoginTCPPort           RADIUSAttributeType = 16 // RFC2865 5.16.  Login-TCP-Port
+	RADIUSAttributeTypeReplyMessage           RADIUSAttributeType = 18 // RFC2865 5.18.  Reply-Message
+	RADIUSAttributeTypeCallbackNumber         RADIUSAttributeType = 19 // RFC2865 5.19.  Callback-Number
+	RADIUSAttributeTypeCallbackId             RADIUSAttributeType = 20 // RFC2865 5.20.  Callback-Id
+	RADIUSAttributeTypeFramedRoute            RADIUSAttributeType = 22 // RFC2865 5.22.  Framed-Route
+	RADIUSAttributeTypeFramedIPXNetwork       RADIUSAttributeType = 23 // RFC2865 5.23.  Framed-IPX-Network
+	RADIUSAttributeTypeState                  RADIUSAttributeType = 24 // RFC2865 5.24.  State
+	RADIUSAttributeTypeClass                  RADIUSAttributeType = 25 // RFC2865 5.25.  Class
+	RADIUSAttributeTypeVendorSpecific         RADIUSAttributeType = 26 // RFC2865 5.26.  Vendor-Specific
+	RADIUSAttributeTypeSessionTimeout         RADIUSAttributeType = 27 // RFC2865 5.27.  Session-Timeout
+	RADIUSAttributeTypeIdleTimeout            RADIUSAttributeType = 28 // RFC2865 5.28.  Idle-Timeout
+	RADIUSAttributeTypeTerminationAction      RADIUSAttributeType = 29 // RFC2865 5.29.  Termination-Action
+	RADIUSAttributeTypeCalledStationId        RADIUSAttributeType = 30 // RFC2865 5.30.  Called-Station-Id
+	RADIUSAttributeTypeCallingStationId       RADIUSAttributeType = 31 // RFC2865 5.31.  Calling-Station-Id
+	RADIUSAttributeTypeNASIdentifier          RADIUSAttributeType = 32 // RFC2865 5.32.  NAS-Identifier
+	RADIUSAttributeTypeProxyState             RADIUSAttributeType = 33 // RFC2865 5.33.  Proxy-State
+	RADIUSAttributeTypeLoginLATService        RADIUSAttributeType = 34 // RFC2865 5.34.  Login-LAT-Service
+	RADIUSAttributeTypeLoginLATNode           RADIUSAttributeType = 35 // RFC2865 5.35.  Login-LAT-Node
+	RADIUSAttributeTypeLoginLATGroup          RADIUSAttributeType = 36 // RFC2865 5.36.  Login-LAT-Group
+	RADIUSAttributeTypeFramedAppleTalkLink    RADIUSAttributeType = 37 // RFC2865 5.37.  Framed-AppleTalk-Link
+	RADIUSAttributeTypeFramedAppleTalkNetwork RADIUSAttributeType = 38 // RFC2865 5.38.  Framed-AppleTalk-Network
+	RADIUSAttributeTypeFramedAppleTalkZone    RADIUSAttributeType = 39 // RFC2865 5.39.  Framed-AppleTalk-Zone
+	RADIUSAttributeTypeAcctStatusType         RADIUSAttributeType = 40 // RFC2866  5.1.  Acct-Status-Type
+	RADIUSAttributeTypeAcctDelayTime          RADIUSAttributeType = 41 // RFC2866  5.2.  Acct-Delay-Time
+	RADIUSAttributeTypeAcctInputOctets        RADIUSAttributeType = 42 // RFC2866  5.3.  Acct-Input-Octets
+	RADIUSAttributeTypeAcctOutputOctets       RADIUSAttributeType = 43 // RFC2866  5.4.  Acct-Output-Octets
+	RADIUSAttributeTypeAcctSessionId          RADIUSAttributeType = 44 // RFC2866  5.5.  Acct-Session-Id
+	RADIUSAttributeTypeAcctAuthentic          RADIUSAttributeType = 45 // RFC2866  5.6.  Acct-Authentic
+	RADIUSAttributeTypeAcctSessionTime        RADIUSAttributeType = 46 // RFC2866  5.7.  Acct-Session-Time
+	RADIUSAttributeTypeAcctInputPackets       RADIUSAttributeType = 47 // RFC2866  5.8.  Acct-Input-Packets
+	RADIUSAttributeTypeAcctOutputPackets      RADIUSAttributeType = 48 // RFC2866  5.9.  Acct-Output-Packets
+	RADIUSAttributeTypeAcctTerminateCause     RADIUSAttributeType = 49 // RFC2866 5.10.  Acct-Terminate-Cause
+	RADIUSAttributeTypeAcctMultiSessionId     RADIUSAttributeType = 50 // RFC2866 5.11.  Acct-Multi-Session-Id
+	RADIUSAttributeTypeAcctLinkCount          RADIUSAttributeType = 51 // RFC2866 5.12.  Acct-Link-Count
+	RADIUSAttributeTypeAcctInputGigawords     RADIUSAttributeType = 52 // RFC2869  5.1.  Acct-Input-Gigawords
+	RADIUSAttributeTypeAcctOutputGigawords    RADIUSAttributeType = 53 // RFC2869  5.2.  Acct-Output-Gigawords
+	RADIUSAttributeTypeEventTimestamp         RADIUSAttributeType = 55 // RFC2869  5.3.  Event-Timestamp
+	RADIUSAttributeTypeCHAPChallenge          RADIUSAttributeType = 60 // RFC2865 5.40.  CHAP-Challenge
+	RADIUSAttributeTypeNASPortType            RADIUSAttributeType = 61 // RFC2865 5.41.  NAS-Port-Type
+	RADIUSAttributeTypePortLimit              RADIUSAttributeType = 62 // RFC2865 5.42.  Port-Limit
+	RADIUSAttributeTypeLoginLATPort           RADIUSAttributeType = 63 // RFC2865 5.43.  Login-LAT-Port
+	RADIUSAttributeTypeTunnelType             RADIUSAttributeType = 64 // RFC2868  3.1.  Tunnel-Type
+	RADIUSAttributeTypeTunnelMediumType       RADIUSAttributeType = 65 // RFC2868  3.2.  Tunnel-Medium-Type
+	RADIUSAttributeTypeTunnelClientEndpoint   RADIUSAttributeType = 66 // RFC2868  3.3.  Tunnel-Client-Endpoint
+	RADIUSAttributeTypeTunnelServerEndpoint   RADIUSAttributeType = 67 // RFC2868  3.4.  Tunnel-Server-Endpoint
+	RADIUSAttributeTypeAcctTunnelConnection   RADIUSAttributeType = 68 // RFC2867  4.1.  Acct-Tunnel-Connection
+	RADIUSAttributeTypeTunnelPassword         RADIUSAttributeType = 69 // RFC2868  3.5.  Tunnel-Password
+	RADIUSAttributeTypeARAPPassword           RADIUSAttributeType = 70 // RFC2869  5.4.  ARAP-Password
+	RADIUSAttributeTypeARAPFeatures           RADIUSAttributeType = 71 // RFC2869  5.5.  ARAP-Features
+	RADIUSAttributeTypeARAPZoneAccess         RADIUSAttributeType = 72 // RFC2869  5.6.  ARAP-Zone-Access
+	RADIUSAttributeTypeARAPSecurity           RADIUSAttributeType = 73 // RFC2869  5.7.  ARAP-Security
+	RADIUSAttributeTypeARAPSecurityData       RADIUSAttributeType = 74 // RFC2869  5.8.  ARAP-Security-Data
+	RADIUSAttributeTypePasswordRetry          RADIUSAttributeType = 75 // RFC2869  5.9.  Password-Retry
+	RADIUSAttributeTypePrompt                 RADIUSAttributeType = 76 // RFC2869 5.10.  Prompt
+	RADIUSAttributeTypeConnectInfo            RADIUSAttributeType = 77 // RFC2869 5.11.  Connect-Info
+	RADIUSAttributeTypeConfigurationToken     RADIUSAttributeType = 78 // RFC2869 5.12.  Configuration-Token
+	RADIUSAttributeTypeEAPMessage             RADIUSAttributeType = 79 // RFC2869 5.13.  EAP-Message
+	RADIUSAttributeTypeMessageAuthenticator   RADIUSAttributeType = 80 // RFC2869 5.14.  Message-Authenticator
+	RADIUSAttributeTypeTunnelPrivateGroupID   RADIUSAttributeType = 81 // RFC2868  3.6.  Tunnel-Private-Group-ID
+	RADIUSAttributeTypeTunnelAssignmentID     RADIUSAttributeType = 82 // RFC2868  3.7.  Tunnel-Assignment-ID
+	RADIUSAttributeTypeTunnelPreference       RADIUSAttributeType = 83 // RFC2868  3.8.  Tunnel-Preference
+	RADIUSAttributeTypeARAPChallengeResponse  RADIUSAttributeType = 84 // RFC2869 5.15.  ARAP-Challenge-Response
+	RADIUSAttributeTypeAcctInterimInterval    RADIUSAttributeType = 85 // RFC2869 5.16.  Acct-Interim-Interval
+	RADIUSAttributeTypeAcctTunnelPacketsLost  RADIUSAttributeType = 86 // RFC2867  4.2.  Acct-Tunnel-Packets-Lost
+	RADIUSAttributeTypeNASPortId              RADIUSAttributeType = 87 // RFC2869 5.17.  NAS-Port-Id
+	RADIUSAttributeTypeFramedPool             RADIUSAttributeType = 88 // RFC2869 5.18.  Framed-Pool
+	RADIUSAttributeTypeTunnelClientAuthID     RADIUSAttributeType = 90 // RFC2868  3.9.  Tunnel-Client-Auth-ID
+	RADIUSAttributeTypeTunnelServerAuthID     RADIUSAttributeType = 91 // RFC2868 3.10.  Tunnel-Server-Auth-ID
+)
+
+// RADIUSAttributeType represents attribute length.
+type RADIUSAttributeLength uint8
+
+// RADIUSAttributeType represents attribute value.
+type RADIUSAttributeValue []byte
+
+// String returns a string version of a RADIUSAttributeType.
+func (t RADIUSAttributeType) String() (s string) {
+	switch t {
+	case RADIUSAttributeTypeUserName:
+		s = "User-Name"
+	case RADIUSAttributeTypeUserPassword:
+		s = "User-Password"
+	case RADIUSAttributeTypeCHAPPassword:
+		s = "CHAP-Password"
+	case RADIUSAttributeTypeNASIPAddress:
+		s = "NAS-IP-Address"
+	case RADIUSAttributeTypeNASPort:
+		s = "NAS-Port"
+	case RADIUSAttributeTypeServiceType:
+		s = "Service-Type"
+	case RADIUSAttributeTypeFramedProtocol:
+		s = "Framed-Protocol"
+	case RADIUSAttributeTypeFramedIPAddress:
+		s = "Framed-IP-Address"
+	case RADIUSAttributeTypeFramedIPNetmask:
+		s = "Framed-IP-Netmask"
+	case RADIUSAttributeTypeFramedRouting:
+		s = "Framed-Routing"
+	case RADIUSAttributeTypeFilterId:
+		s = "Filter-Id"
+	case RADIUSAttributeTypeFramedMTU:
+		s = "Framed-MTU"
+	case RADIUSAttributeTypeFramedCompression:
+		s = "Framed-Compression"
+	case RADIUSAttributeTypeLoginIPHost:
+		s = "Login-IP-Host"
+	case RADIUSAttributeTypeLoginService:
+		s = "Login-Service"
+	case RADIUSAttributeTypeLoginTCPPort:
+		s = "Login-TCP-Port"
+	case RADIUSAttributeTypeReplyMessage:
+		s = "Reply-Message"
+	case RADIUSAttributeTypeCallbackNumber:
+		s = "Callback-Number"
+	case RADIUSAttributeTypeCallbackId:
+		s = "Callback-Id"
+	case RADIUSAttributeTypeFramedRoute:
+		s = "Framed-Route"
+	case RADIUSAttributeTypeFramedIPXNetwork:
+		s = "Framed-IPX-Network"
+	case RADIUSAttributeTypeState:
+		s = "State"
+	case RADIUSAttributeTypeClass:
+		s = "Class"
+	case RADIUSAttributeTypeVendorSpecific:
+		s = "Vendor-Specific"
+	case RADIUSAttributeTypeSessionTimeout:
+		s = "Session-Timeout"
+	case RADIUSAttributeTypeIdleTimeout:
+		s = "Idle-Timeout"
+	case RADIUSAttributeTypeTerminationAction:
+		s = "Termination-Action"
+	case RADIUSAttributeTypeCalledStationId:
+		s = "Called-Station-Id"
+	case RADIUSAttributeTypeCallingStationId:
+		s = "Calling-Station-Id"
+	case RADIUSAttributeTypeNASIdentifier:
+		s = "NAS-Identifier"
+	case RADIUSAttributeTypeProxyState:
+		s = "Proxy-State"
+	case RADIUSAttributeTypeLoginLATService:
+		s = "Login-LAT-Service"
+	case RADIUSAttributeTypeLoginLATNode:
+		s = "Login-LAT-Node"
+	case RADIUSAttributeTypeLoginLATGroup:
+		s = "Login-LAT-Group"
+	case RADIUSAttributeTypeFramedAppleTalkLink:
+		s = "Framed-AppleTalk-Link"
+	case RADIUSAttributeTypeFramedAppleTalkNetwork:
+		s = "Framed-AppleTalk-Network"
+	case RADIUSAttributeTypeFramedAppleTalkZone:
+		s = "Framed-AppleTalk-Zone"
+	case RADIUSAttributeTypeAcctStatusType:
+		s = "Acct-Status-Type"
+	case RADIUSAttributeTypeAcctDelayTime:
+		s = "Acct-Delay-Time"
+	case RADIUSAttributeTypeAcctInputOctets:
+		s = "Acct-Input-Octets"
+	case RADIUSAttributeTypeAcctOutputOctets:
+		s = "Acct-Output-Octets"
+	case RADIUSAttributeTypeAcctSessionId:
+		s = "Acct-Session-Id"
+	case RADIUSAttributeTypeAcctAuthentic:
+		s = "Acct-Authentic"
+	case RADIUSAttributeTypeAcctSessionTime:
+		s = "Acct-Session-Time"
+	case RADIUSAttributeTypeAcctInputPackets:
+		s = "Acct-Input-Packets"
+	case RADIUSAttributeTypeAcctOutputPackets:
+		s = "Acct-Output-Packets"
+	case RADIUSAttributeTypeAcctTerminateCause:
+		s = "Acct-Terminate-Cause"
+	case RADIUSAttributeTypeAcctMultiSessionId:
+		s = "Acct-Multi-Session-Id"
+	case RADIUSAttributeTypeAcctLinkCount:
+		s = "Acct-Link-Count"
+	case RADIUSAttributeTypeAcctInputGigawords:
+		s = "Acct-Input-Gigawords"
+	case RADIUSAttributeTypeAcctOutputGigawords:
+		s = "Acct-Output-Gigawords"
+	case RADIUSAttributeTypeEventTimestamp:
+		s = "Event-Timestamp"
+	case RADIUSAttributeTypeCHAPChallenge:
+		s = "CHAP-Challenge"
+	case RADIUSAttributeTypeNASPortType:
+		s = "NAS-Port-Type"
+	case RADIUSAttributeTypePortLimit:
+		s = "Port-Limit"
+	case RADIUSAttributeTypeLoginLATPort:
+		s = "Login-LAT-Port"
+	case RADIUSAttributeTypeTunnelType:
+		s = "Tunnel-Type"
+	case RADIUSAttributeTypeTunnelMediumType:
+		s = "Tunnel-Medium-Type"
+	case RADIUSAttributeTypeTunnelClientEndpoint:
+		s = "Tunnel-Client-Endpoint"
+	case RADIUSAttributeTypeTunnelServerEndpoint:
+		s = "Tunnel-Server-Endpoint"
+	case RADIUSAttributeTypeAcctTunnelConnection:
+		s = "Acct-Tunnel-Connection"
+	case RADIUSAttributeTypeTunnelPassword:
+		s = "Tunnel-Password"
+	case RADIUSAttributeTypeARAPPassword:
+		s = "ARAP-Password"
+	case RADIUSAttributeTypeARAPFeatures:
+		s = "ARAP-Features"
+	case RADIUSAttributeTypeARAPZoneAccess:
+		s = "ARAP-Zone-Access"
+	case RADIUSAttributeTypeARAPSecurity:
+		s = "ARAP-Security"
+	case RADIUSAttributeTypeARAPSecurityData:
+		s = "ARAP-Security-Data"
+	case RADIUSAttributeTypePasswordRetry:
+		s = "Password-Retry"
+	case RADIUSAttributeTypePrompt:
+		s = "Prompt"
+	case RADIUSAttributeTypeConnectInfo:
+		s = "Connect-Info"
+	case RADIUSAttributeTypeConfigurationToken:
+		s = "Configuration-Token"
+	case RADIUSAttributeTypeEAPMessage:
+		s = "EAP-Message"
+	case RADIUSAttributeTypeMessageAuthenticator:
+		s = "Message-Authenticator"
+	case RADIUSAttributeTypeTunnelPrivateGroupID:
+		s = "Tunnel-Private-Group-ID"
+	case RADIUSAttributeTypeTunnelAssignmentID:
+		s = "Tunnel-Assignment-ID"
+	case RADIUSAttributeTypeTunnelPreference:
+		s = "Tunnel-Preference"
+	case RADIUSAttributeTypeARAPChallengeResponse:
+		s = "ARAP-Challenge-Response"
+	case RADIUSAttributeTypeAcctInterimInterval:
+		s = "Acct-Interim-Interval"
+	case RADIUSAttributeTypeAcctTunnelPacketsLost:
+		s = "Acct-Tunnel-Packets-Lost"
+	case RADIUSAttributeTypeNASPortId:
+		s = "NAS-Port-Id"
+	case RADIUSAttributeTypeFramedPool:
+		s = "Framed-Pool"
+	case RADIUSAttributeTypeTunnelClientAuthID:
+		s = "Tunnel-Client-Auth-ID"
+	case RADIUSAttributeTypeTunnelServerAuthID:
+		s = "Tunnel-Server-Auth-ID"
+	default:
+		s = fmt.Sprintf("Unknown(%d)", t)
+	}
+	return
+}
+
+// Len returns the length of a RADIUS packet.
+func (radius *RADIUS) Len() (int, error) {
+	n := radiusMinimumRecordSizeInBytes
+	for _, v := range radius.Attributes {
+		alen, err := attributeValueLength(v.Value)
+		if err != nil {
+			return 0, err
+		}
+		n += int(alen) + 2 // Added Type and Length
+	}
+	return n, nil
+}
+
+// LayerType returns LayerTypeRADIUS.
+func (radius *RADIUS) LayerType() gopacket.LayerType {
+	return LayerTypeRADIUS
+}
+
+// DecodeFromBytes decodes the given bytes into this layer.
+func (radius *RADIUS) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+	if len(data) > radiusMaximumRecordSizeInBytes {
+		df.SetTruncated()
+		return fmt.Errorf("RADIUS length %d too big", len(data))
+	}
+
+	if len(data) < radiusMinimumRecordSizeInBytes {
+		df.SetTruncated()
+		return fmt.Errorf("RADIUS length %d too short", len(data))
+	}
+
+	radius.BaseLayer = BaseLayer{Contents: data}
+
+	radius.Code = RADIUSCode(data[0])
+	radius.Identifier = RADIUSIdentifier(data[1])
+	radius.Length = RADIUSLength(binary.BigEndian.Uint16(data[2:4]))
+
+	if int(radius.Length) > radiusMaximumRecordSizeInBytes {
+		df.SetTruncated()
+		return fmt.Errorf("RADIUS length %d too big", radius.Length)
+	}
+
+	if int(radius.Length) < radiusMinimumRecordSizeInBytes {
+		df.SetTruncated()
+		return fmt.Errorf("RADIUS length %d too short", radius.Length)
+	}
+
+	// RFC 2865 3.  Packet Format
+	// `If the packet is shorter than the Length field indicates, it MUST be silently discarded.`
+	if int(radius.Length) > len(data) {
+		df.SetTruncated()
+		return fmt.Errorf("RADIUS length %d too big", radius.Length)
+	}
+
+	// RFC 2865 3.  Packet Format
+	// `Octets outside the range of the Length field MUST be treated as padding and ignored on reception.`
+	if int(radius.Length) < len(data) {
+		df.SetTruncated()
+		data = data[:radius.Length]
+	}
+
+	copy(radius.Authenticator[:], data[4:20])
+
+	if len(data) == radiusMinimumRecordSizeInBytes {
+		return nil
+	}
+
+	pos := radiusMinimumRecordSizeInBytes
+	for {
+		if len(data) == pos {
+			break
+		}
+
+		if len(data[pos:]) < radiusAttributesMinimumRecordSizeInBytes {
+			df.SetTruncated()
+			return fmt.Errorf("RADIUS attributes length %d too short", len(data[pos:]))
+		}
+
+		attr := RADIUSAttribute{}
+		attr.Type = RADIUSAttributeType(data[pos])
+		attr.Length = RADIUSAttributeLength(data[pos+1])
+
+		if int(attr.Length) > len(data[pos:]) {
+			df.SetTruncated()
+			return fmt.Errorf("RADIUS attributes length %d too big", attr.Length)
+		}
+
+		if int(attr.Length) < radiusAttributesMinimumRecordSizeInBytes {
+			df.SetTruncated()
+			return fmt.Errorf("RADIUS attributes length %d too short", attr.Length)
+		}
+
+		if int(attr.Length) > radiusAttributesMinimumRecordSizeInBytes {
+			attr.Value = make([]byte, attr.Length-2)
+			copy(attr.Value[:], data[pos+2:pos+int(attr.Length)])
+			radius.Attributes = append(radius.Attributes, attr)
+		}
+
+		pos += int(attr.Length)
+	}
+
+	for _, v := range radius.Attributes {
+		if v.Type == RADIUSAttributeTypeEAPMessage {
+			radius.BaseLayer.Payload = append(radius.BaseLayer.Payload, v.Value...)
+		}
+	}
+
+	return nil
+}
+
+// SerializeTo writes the serialized form of this layer into the
+// SerializationBuffer, implementing gopacket.SerializableLayer.
+// See the docs for gopacket.SerializableLayer for more info.
+func (radius *RADIUS) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	plen, err := radius.Len()
+	if err != nil {
+		return err
+	}
+
+	if opts.FixLengths {
+		radius.Length = RADIUSLength(plen)
+	}
+
+	data, err := b.PrependBytes(plen)
+	if err != nil {
+		return err
+	}
+
+	data[0] = byte(radius.Code)
+	data[1] = byte(radius.Identifier)
+	binary.BigEndian.PutUint16(data[2:], uint16(radius.Length))
+	copy(data[4:20], radius.Authenticator[:])
+
+	pos := radiusMinimumRecordSizeInBytes
+	for _, v := range radius.Attributes {
+		if opts.FixLengths {
+			v.Length, err = attributeValueLength(v.Value)
+			if err != nil {
+				return err
+			}
+		}
+
+		data[pos] = byte(v.Type)
+		data[pos+1] = byte(v.Length)
+		copy(data[pos+2:], v.Value[:])
+
+		pos += len(v.Value) + 2 // Added Type and Length
+	}
+
+	return nil
+}
+
+// CanDecode returns the set of layer types that this DecodingLayer can decode.
+func (radius *RADIUS) CanDecode() gopacket.LayerClass {
+	return LayerTypeRADIUS
+}
+
+// NextLayerType returns the layer type contained by this DecodingLayer.
+func (radius *RADIUS) NextLayerType() gopacket.LayerType {
+	if len(radius.BaseLayer.Payload) > 0 {
+		return LayerTypeEAP
+	} else {
+		return gopacket.LayerTypeZero
+	}
+}
+
+// Payload returns the EAP Type-Data for EAP-Message attributes.
+func (radius *RADIUS) Payload() []byte {
+	return radius.BaseLayer.Payload
+}
+
+func decodeRADIUS(data []byte, p gopacket.PacketBuilder) error {
+	radius := &RADIUS{}
+	err := radius.DecodeFromBytes(data, p)
+	if err != nil {
+		return err
+	}
+	p.AddLayer(radius)
+	p.SetApplicationLayer(radius)
+	next := radius.NextLayerType()
+	if next == gopacket.LayerTypeZero {
+		return nil
+	}
+	return p.NextDecoder(next)
+}
+
+func attributeValueLength(v []byte) (RADIUSAttributeLength, error) {
+	n := len(v)
+	if n > 255 {
+		return 0, fmt.Errorf("RADIUS attribute value length %d too long", n)
+	} else {
+		return RADIUSAttributeLength(n), nil
+	}
+}

vendor/github.com/google/gopacket/layers/rmcp.go

@@ -0,0 +1,170 @@
+// Copyright 2019 The GoPacket Authors. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license that can be found
+// in the LICENSE file in the root of the source tree.
+
+package layers
+
+// This file implements the ASF-RMCP header specified in section 3.2.2.2 of
+// https://www.dmtf.org/sites/default/files/standards/documents/DSP0136.pdf
+
+import (
+	"fmt"
+
+	"github.com/google/gopacket"
+)
+
+// RMCPClass is the class of a RMCP layer's payload, e.g. ASF or IPMI. This is a
+// 4-bit unsigned int on the wire; all but 6 (ASF), 7 (IPMI) and 8 (OEM-defined)
+// are currently reserved.
+type RMCPClass uint8
+
+// LayerType returns the payload layer type corresponding to a RMCP class.
+func (c RMCPClass) LayerType() gopacket.LayerType {
+	if lt := rmcpClassLayerTypes[uint8(c)]; lt != 0 {
+		return lt
+	}
+	return gopacket.LayerTypePayload
+}
+
+func (c RMCPClass) String() string {
+	return fmt.Sprintf("%v(%v)", uint8(c), c.LayerType())
+}
+
+const (
+	// RMCPVersion1 identifies RMCP v1.0 in the Version header field. Lower
+	// values are considered legacy, while higher values are reserved by the
+	// specification.
+	RMCPVersion1 uint8 = 0x06
+
+	// RMCPNormal indicates a "normal" message, i.e. not an acknowledgement.
+	RMCPNormal uint8 = 0
+
+	// RMCPAck indicates a message is acknowledging a received normal message.
+	RMCPAck uint8 = 1 << 7
+
+	// RMCPClassASF identifies an RMCP message as containing an ASF-RMCP
+	// payload.
+	RMCPClassASF RMCPClass = 0x06
+
+	// RMCPClassIPMI identifies an RMCP message as containing an IPMI payload.
+	RMCPClassIPMI RMCPClass = 0x07
+
+	// RMCPClassOEM identifies an RMCP message as containing an OEM-defined
+	// payload.
+	RMCPClassOEM RMCPClass = 0x08
+)
+
+var (
+	rmcpClassLayerTypes = [16]gopacket.LayerType{
+		RMCPClassASF: LayerTypeASF,
+		// RMCPClassIPMI is to implement; RMCPClassOEM is deliberately not
+		// implemented, so we return LayerTypePayload
+	}
+)
+
+// RegisterRMCPLayerType allows specifying that the payload of a RMCP packet of
+// a certain class should processed by the provided layer type. This overrides
+// any existing registrations, including defaults.
+func RegisterRMCPLayerType(c RMCPClass, l gopacket.LayerType) {
+	rmcpClassLayerTypes[c] = l
+}
+
+// RMCP describes the format of an RMCP header, which forms a UDP payload. See
+// section 3.2.2.2.
+type RMCP struct {
+	BaseLayer
+
+	// Version identifies the version of the RMCP header. 0x06 indicates RMCP
+	// v1.0; lower values are legacy, higher values are reserved.
+	Version uint8
+
+	// Sequence is the sequence number assicated with the message. Note that
+	// this rolls over to 0 after 254, not 255. Seq num 255 indicates the
+	// receiver must not send an ACK.
+	Sequence uint8
+
+	// Ack indicates whether this packet is an acknowledgement. If it is, the
+	// payload will be empty.
+	Ack bool
+
+	// Class idicates the structure of the payload. There are only 2^4 valid
+	// values, however there is no uint4 data type. N.B. the Ack bit has been
+	// split off into another field. The most significant 4 bits of this field
+	// will always be 0.
+	Class RMCPClass
+}
+
+// LayerType returns LayerTypeRMCP. It partially satisfies Layer and
+// SerializableLayer.
+func (*RMCP) LayerType() gopacket.LayerType {
+	return LayerTypeRMCP
+}
+
+// CanDecode returns LayerTypeRMCP. It partially satisfies DecodingLayer.
+func (r *RMCP) CanDecode() gopacket.LayerClass {
+	return r.LayerType()
+}
+
+// DecodeFromBytes makes the layer represent the provided bytes. It partially
+// satisfies DecodingLayer.
+func (r *RMCP) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+	if len(data) < 4 {
+		df.SetTruncated()
+		return fmt.Errorf("invalid RMCP header, length %v less than 4",
+			len(data))
+	}
+
+	r.BaseLayer.Contents = data[:4]
+	r.BaseLayer.Payload = data[4:]
+
+	r.Version = uint8(data[0])
+	// 1 byte reserved
+	r.Sequence = uint8(data[2])
+	r.Ack = data[3]&RMCPAck != 0
+	r.Class = RMCPClass(data[3] & 0xF)
+	return nil
+}
+
+// NextLayerType returns the data layer of this RMCP layer. This partially
+// satisfies DecodingLayer.
+func (r *RMCP) NextLayerType() gopacket.LayerType {
+	return r.Class.LayerType()
+}
+
+// Payload returns the data layer. It partially satisfies ApplicationLayer.
+func (r *RMCP) Payload() []byte {
+	return r.BaseLayer.Payload
+}
+
+// SerializeTo writes the serialized fom of this layer into the SerializeBuffer,
+// partially satisfying SerializableLayer.
+func (r *RMCP) SerializeTo(b gopacket.SerializeBuffer, _ gopacket.SerializeOptions) error {
+	// The IPMI v1.5 spec contains a pad byte for frame sizes of certain lengths
+	// to work around issues in LAN chips. This is no longer necessary as of
+	// IPMI v2.0 (renamed to "legacy pad") so we do not attempt to add it. The
+	// same approach is taken by FreeIPMI:
+	// http://git.savannah.gnu.org/cgit/freeipmi.git/tree/libfreeipmi/interface/ipmi-lan-interface.c?id=b5ffcd38317daf42074458879f4c55ba6804a595#n836
+	bytes, err := b.PrependBytes(4)
+	if err != nil {
+		return err
+	}
+	bytes[0] = r.Version
+	bytes[1] = 0x00
+	bytes[2] = r.Sequence
+	bytes[3] = bool2uint8(r.Ack)<<7 | uint8(r.Class) // thanks, BFD layer
+	return nil
+}
+
+// decodeRMCP decodes the byte slice into an RMCP type, and sets the application
+// layer to it.
+func decodeRMCP(data []byte, p gopacket.PacketBuilder) error {
+	rmcp := &RMCP{}
+	err := rmcp.DecodeFromBytes(data, p)
+	p.AddLayer(rmcp)
+	p.SetApplicationLayer(rmcp)
+	if err != nil {
+		return err
+	}
+	return p.NextDecoder(rmcp.NextLayerType())
+}

vendor/github.com/google/gopacket/layers/rudp.go

@@ -0,0 +1,93 @@
+// Copyright 2012 Google, Inc. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+package layers
+
+import (
+	"encoding/binary"
+	"fmt"
+	"github.com/google/gopacket"
+)
+
+type RUDP struct {
+	BaseLayer
+	SYN, ACK, EACK, RST, NUL bool
+	Version                  uint8
+	HeaderLength             uint8
+	SrcPort, DstPort         RUDPPort
+	DataLength               uint16
+	Seq, Ack, Checksum       uint32
+	VariableHeaderArea       []byte
+	// RUDPHeaderSyn contains SYN information for the RUDP packet,
+	// if the SYN flag is set
+	*RUDPHeaderSYN
+	// RUDPHeaderEack contains EACK information for the RUDP packet,
+	// if the EACK flag is set.
+	*RUDPHeaderEACK
+}
+
+type RUDPHeaderSYN struct {
+	MaxOutstandingSegments, MaxSegmentSize, OptionFlags uint16
+}
+
+type RUDPHeaderEACK struct {
+	SeqsReceivedOK []uint32
+}
+
+// LayerType returns gopacket.LayerTypeRUDP.
+func (r *RUDP) LayerType() gopacket.LayerType { return LayerTypeRUDP }
+
+func decodeRUDP(data []byte, p gopacket.PacketBuilder) error {
+	r := &RUDP{
+		SYN:          data[0]&0x80 != 0,
+		ACK:          data[0]&0x40 != 0,
+		EACK:         data[0]&0x20 != 0,
+		RST:          data[0]&0x10 != 0,
+		NUL:          data[0]&0x08 != 0,
+		Version:      data[0] & 0x3,
+		HeaderLength: data[1],
+		SrcPort:      RUDPPort(data[2]),
+		DstPort:      RUDPPort(data[3]),
+		DataLength:   binary.BigEndian.Uint16(data[4:6]),
+		Seq:          binary.BigEndian.Uint32(data[6:10]),
+		Ack:          binary.BigEndian.Uint32(data[10:14]),
+		Checksum:     binary.BigEndian.Uint32(data[14:18]),
+	}
+	if r.HeaderLength < 9 {
+		return fmt.Errorf("RUDP packet with too-short header length %d", r.HeaderLength)
+	}
+	hlen := int(r.HeaderLength) * 2
+	r.Contents = data[:hlen]
+	r.Payload = data[hlen : hlen+int(r.DataLength)]
+	r.VariableHeaderArea = data[18:hlen]
+	headerData := r.VariableHeaderArea
+	switch {
+	case r.SYN:
+		if len(headerData) != 6 {
+			return fmt.Errorf("RUDP packet invalid SYN header length: %d", len(headerData))
+		}
+		r.RUDPHeaderSYN = &RUDPHeaderSYN{
+			MaxOutstandingSegments: binary.BigEndian.Uint16(headerData[:2]),
+			MaxSegmentSize:         binary.BigEndian.Uint16(headerData[2:4]),
+			OptionFlags:            binary.BigEndian.Uint16(headerData[4:6]),
+		}
+	case r.EACK:
+		if len(headerData)%4 != 0 {
+			return fmt.Errorf("RUDP packet invalid EACK header length: %d", len(headerData))
+		}
+		r.RUDPHeaderEACK = &RUDPHeaderEACK{make([]uint32, len(headerData)/4)}
+		for i := 0; i < len(headerData); i += 4 {
+			r.SeqsReceivedOK[i/4] = binary.BigEndian.Uint32(headerData[i : i+4])
+		}
+	}
+	p.AddLayer(r)
+	p.SetTransportLayer(r)
+	return p.NextDecoder(gopacket.LayerTypePayload)
+}
+
+func (r *RUDP) TransportFlow() gopacket.Flow {
+	return gopacket.NewFlow(EndpointRUDPPort, []byte{byte(r.SrcPort)}, []byte{byte(r.DstPort)})
+}

vendor/github.com/google/gopacket/layers/sctp.go

@@ -0,0 +1,746 @@
+// Copyright 2012 Google, Inc. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+package layers
+
+import (
+	"encoding/binary"
+	"errors"
+	"fmt"
+	"hash/crc32"
+
+	"github.com/google/gopacket"
+)
+
+// SCTP contains information on the top level of an SCTP packet.
+type SCTP struct {
+	BaseLayer
+	SrcPort, DstPort SCTPPort
+	VerificationTag  uint32
+	Checksum         uint32
+	sPort, dPort     []byte
+}
+
+// LayerType returns gopacket.LayerTypeSCTP
+func (s *SCTP) LayerType() gopacket.LayerType { return LayerTypeSCTP }
+
+func decodeSCTP(data []byte, p gopacket.PacketBuilder) error {
+	sctp := &SCTP{}
+	err := sctp.DecodeFromBytes(data, p)
+	p.AddLayer(sctp)
+	p.SetTransportLayer(sctp)
+	if err != nil {
+		return err
+	}
+	return p.NextDecoder(sctpChunkTypePrefixDecoder)
+}
+
+var sctpChunkTypePrefixDecoder = gopacket.DecodeFunc(decodeWithSCTPChunkTypePrefix)
+
+// TransportFlow returns a flow based on the source and destination SCTP port.
+func (s *SCTP) TransportFlow() gopacket.Flow {
+	return gopacket.NewFlow(EndpointSCTPPort, s.sPort, s.dPort)
+}
+
+func decodeWithSCTPChunkTypePrefix(data []byte, p gopacket.PacketBuilder) error {
+	chunkType := SCTPChunkType(data[0])
+	return chunkType.Decode(data, p)
+}
+
+// SerializeTo is for gopacket.SerializableLayer.
+func (s SCTP) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	bytes, err := b.PrependBytes(12)
+	if err != nil {
+		return err
+	}
+	binary.BigEndian.PutUint16(bytes[0:2], uint16(s.SrcPort))
+	binary.BigEndian.PutUint16(bytes[2:4], uint16(s.DstPort))
+	binary.BigEndian.PutUint32(bytes[4:8], s.VerificationTag)
+	if opts.ComputeChecksums {
+		// Note:  MakeTable(Castagnoli) actually only creates the table once, then
+		// passes back a singleton on every other call, so this shouldn't cause
+		// excessive memory allocation.
+		binary.LittleEndian.PutUint32(bytes[8:12], crc32.Checksum(b.Bytes(), crc32.MakeTable(crc32.Castagnoli)))
+	}
+	return nil
+}
+
+func (sctp *SCTP) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+	if len(data) < 12 {
+		return errors.New("Invalid SCTP common header length")
+	}
+	sctp.SrcPort = SCTPPort(binary.BigEndian.Uint16(data[:2]))
+	sctp.sPort = data[:2]
+	sctp.DstPort = SCTPPort(binary.BigEndian.Uint16(data[2:4]))
+	sctp.dPort = data[2:4]
+	sctp.VerificationTag = binary.BigEndian.Uint32(data[4:8])
+	sctp.Checksum = binary.BigEndian.Uint32(data[8:12])
+	sctp.BaseLayer = BaseLayer{data[:12], data[12:]}
+
+	return nil
+}
+
+func (t *SCTP) CanDecode() gopacket.LayerClass {
+	return LayerTypeSCTP
+}
+
+func (t *SCTP) NextLayerType() gopacket.LayerType {
+	return gopacket.LayerTypePayload
+}
+
+// SCTPChunk contains the common fields in all SCTP chunks.
+type SCTPChunk struct {
+	BaseLayer
+	Type   SCTPChunkType
+	Flags  uint8
+	Length uint16
+	// ActualLength is the total length of an SCTP chunk, including padding.
+	// SCTP chunks start and end on 4-byte boundaries.  So if a chunk has a length
+	// of 18, it means that it has data up to and including byte 18, then padding
+	// up to the next 4-byte boundary, 20.  In this case, Length would be 18, and
+	// ActualLength would be 20.
+	ActualLength int
+}
+
+func roundUpToNearest4(i int) int {
+	if i%4 == 0 {
+		return i
+	}
+	return i + 4 - (i % 4)
+}
+
+func decodeSCTPChunk(data []byte) (SCTPChunk, error) {
+	length := binary.BigEndian.Uint16(data[2:4])
+	if length < 4 {
+		return SCTPChunk{}, errors.New("invalid SCTP chunk length")
+	}
+	actual := roundUpToNearest4(int(length))
+	ct := SCTPChunkType(data[0])
+
+	// For SCTP Data, use a separate layer for the payload
+	delta := 0
+	if ct == SCTPChunkTypeData {
+		delta = int(actual) - int(length)
+		actual = 16
+	}
+
+	return SCTPChunk{
+		Type:         ct,
+		Flags:        data[1],
+		Length:       length,
+		ActualLength: actual,
+		BaseLayer:    BaseLayer{data[:actual], data[actual : len(data)-delta]},
+	}, nil
+}
+
+// SCTPParameter is a TLV parameter inside a SCTPChunk.
+type SCTPParameter struct {
+	Type         uint16
+	Length       uint16
+	ActualLength int
+	Value        []byte
+}
+
+func decodeSCTPParameter(data []byte) SCTPParameter {
+	length := binary.BigEndian.Uint16(data[2:4])
+	return SCTPParameter{
+		Type:         binary.BigEndian.Uint16(data[0:2]),
+		Length:       length,
+		Value:        data[4:length],
+		ActualLength: roundUpToNearest4(int(length)),
+	}
+}
+
+func (p SCTPParameter) Bytes() []byte {
+	length := 4 + len(p.Value)
+	data := make([]byte, roundUpToNearest4(length))
+	binary.BigEndian.PutUint16(data[0:2], p.Type)
+	binary.BigEndian.PutUint16(data[2:4], uint16(length))
+	copy(data[4:], p.Value)
+	return data
+}
+
+// SCTPUnknownChunkType is the layer type returned when we don't recognize the
+// chunk type.  Since there's a length in a known location, we can skip over
+// it even if we don't know what it is, and continue parsing the rest of the
+// chunks.  This chunk is stored as an ErrorLayer in the packet.
+type SCTPUnknownChunkType struct {
+	SCTPChunk
+	bytes []byte
+}
+
+func decodeSCTPChunkTypeUnknown(data []byte, p gopacket.PacketBuilder) error {
+	chunk, err := decodeSCTPChunk(data)
+	if err != nil {
+		return err
+	}
+	sc := &SCTPUnknownChunkType{SCTPChunk: chunk}
+	sc.bytes = data[:sc.ActualLength]
+	p.AddLayer(sc)
+	p.SetErrorLayer(sc)
+	return p.NextDecoder(gopacket.DecodeFunc(decodeWithSCTPChunkTypePrefix))
+}
+
+// SerializeTo is for gopacket.SerializableLayer.
+func (s SCTPUnknownChunkType) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	bytes, err := b.PrependBytes(s.ActualLength)
+	if err != nil {
+		return err
+	}
+	copy(bytes, s.bytes)
+	return nil
+}
+
+// LayerType returns gopacket.LayerTypeSCTPUnknownChunkType.
+func (s *SCTPUnknownChunkType) LayerType() gopacket.LayerType { return LayerTypeSCTPUnknownChunkType }
+
+// Payload returns all bytes in this header, including the decoded Type, Length,
+// and Flags.
+func (s *SCTPUnknownChunkType) Payload() []byte { return s.bytes }
+
+// Error implements ErrorLayer.
+func (s *SCTPUnknownChunkType) Error() error {
+	return fmt.Errorf("No decode method available for SCTP chunk type %s", s.Type)
+}
+
+// SCTPData is the SCTP Data chunk layer.
+type SCTPData struct {
+	SCTPChunk
+	Unordered, BeginFragment, EndFragment bool
+	TSN                                   uint32
+	StreamId                              uint16
+	StreamSequence                        uint16
+	PayloadProtocol                       SCTPPayloadProtocol
+}
+
+// LayerType returns gopacket.LayerTypeSCTPData.
+func (s *SCTPData) LayerType() gopacket.LayerType { return LayerTypeSCTPData }
+
+// SCTPPayloadProtocol represents a payload protocol
+type SCTPPayloadProtocol uint32
+
+// SCTPPayloadProtocol constonts from http://www.iana.org/assignments/sctp-parameters/sctp-parameters.xhtml
+const (
+	SCTPProtocolReserved  SCTPPayloadProtocol = 0
+	SCTPPayloadUIA                            = 1
+	SCTPPayloadM2UA                           = 2
+	SCTPPayloadM3UA                           = 3
+	SCTPPayloadSUA                            = 4
+	SCTPPayloadM2PA                           = 5
+	SCTPPayloadV5UA                           = 6
+	SCTPPayloadH248                           = 7
+	SCTPPayloadBICC                           = 8
+	SCTPPayloadTALI                           = 9
+	SCTPPayloadDUA                            = 10
+	SCTPPayloadASAP                           = 11
+	SCTPPayloadENRP                           = 12
+	SCTPPayloadH323                           = 13
+	SCTPPayloadQIPC                           = 14
+	SCTPPayloadSIMCO                          = 15
+	SCTPPayloadDDPSegment                     = 16
+	SCTPPayloadDDPStream                      = 17
+	SCTPPayloadS1AP                           = 18
+)
+
+func (p SCTPPayloadProtocol) String() string {
+	switch p {
+	case SCTPProtocolReserved:
+		return "Reserved"
+	case SCTPPayloadUIA:
+		return "UIA"
+	case SCTPPayloadM2UA:
+		return "M2UA"
+	case SCTPPayloadM3UA:
+		return "M3UA"
+	case SCTPPayloadSUA:
+		return "SUA"
+	case SCTPPayloadM2PA:
+		return "M2PA"
+	case SCTPPayloadV5UA:
+		return "V5UA"
+	case SCTPPayloadH248:
+		return "H.248"
+	case SCTPPayloadBICC:
+		return "BICC"
+	case SCTPPayloadTALI:
+		return "TALI"
+	case SCTPPayloadDUA:
+		return "DUA"
+	case SCTPPayloadASAP:
+		return "ASAP"
+	case SCTPPayloadENRP:
+		return "ENRP"
+	case SCTPPayloadH323:
+		return "H.323"
+	case SCTPPayloadQIPC:
+		return "QIPC"
+	case SCTPPayloadSIMCO:
+		return "SIMCO"
+	case SCTPPayloadDDPSegment:
+		return "DDPSegment"
+	case SCTPPayloadDDPStream:
+		return "DDPStream"
+	case SCTPPayloadS1AP:
+		return "S1AP"
+	}
+	return fmt.Sprintf("Unknown(%d)", p)
+}
+
+func decodeSCTPData(data []byte, p gopacket.PacketBuilder) error {
+	chunk, err := decodeSCTPChunk(data)
+	if err != nil {
+		return err
+	}
+	sc := &SCTPData{
+		SCTPChunk:       chunk,
+		Unordered:       data[1]&0x4 != 0,
+		BeginFragment:   data[1]&0x2 != 0,
+		EndFragment:     data[1]&0x1 != 0,
+		TSN:             binary.BigEndian.Uint32(data[4:8]),
+		StreamId:        binary.BigEndian.Uint16(data[8:10]),
+		StreamSequence:  binary.BigEndian.Uint16(data[10:12]),
+		PayloadProtocol: SCTPPayloadProtocol(binary.BigEndian.Uint32(data[12:16])),
+	}
+	// Length is the length in bytes of the data, INCLUDING the 16-byte header.
+	p.AddLayer(sc)
+	return p.NextDecoder(gopacket.LayerTypePayload)
+}
+
+// SerializeTo is for gopacket.SerializableLayer.
+func (sc SCTPData) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	payload := b.Bytes()
+	// Pad the payload to a 32 bit boundary
+	if rem := len(payload) % 4; rem != 0 {
+		b.AppendBytes(4 - rem)
+	}
+	length := 16
+	bytes, err := b.PrependBytes(length)
+	if err != nil {
+		return err
+	}
+	bytes[0] = uint8(sc.Type)
+	flags := uint8(0)
+	if sc.Unordered {
+		flags |= 0x4
+	}
+	if sc.BeginFragment {
+		flags |= 0x2
+	}
+	if sc.EndFragment {
+		flags |= 0x1
+	}
+	bytes[1] = flags
+	binary.BigEndian.PutUint16(bytes[2:4], uint16(length+len(payload)))
+	binary.BigEndian.PutUint32(bytes[4:8], sc.TSN)
+	binary.BigEndian.PutUint16(bytes[8:10], sc.StreamId)
+	binary.BigEndian.PutUint16(bytes[10:12], sc.StreamSequence)
+	binary.BigEndian.PutUint32(bytes[12:16], uint32(sc.PayloadProtocol))
+	return nil
+}
+
+// SCTPInitParameter is a parameter for an SCTP Init or InitAck packet.
+type SCTPInitParameter SCTPParameter
+
+// SCTPInit is used as the return value for both SCTPInit and SCTPInitAck
+// messages.
+type SCTPInit struct {
+	SCTPChunk
+	InitiateTag                     uint32
+	AdvertisedReceiverWindowCredit  uint32
+	OutboundStreams, InboundStreams uint16
+	InitialTSN                      uint32
+	Parameters                      []SCTPInitParameter
+}
+
+// LayerType returns either gopacket.LayerTypeSCTPInit or gopacket.LayerTypeSCTPInitAck.
+func (sc *SCTPInit) LayerType() gopacket.LayerType {
+	if sc.Type == SCTPChunkTypeInitAck {
+		return LayerTypeSCTPInitAck
+	}
+	// sc.Type == SCTPChunkTypeInit
+	return LayerTypeSCTPInit
+}
+
+func decodeSCTPInit(data []byte, p gopacket.PacketBuilder) error {
+	chunk, err := decodeSCTPChunk(data)
+	if err != nil {
+		return err
+	}
+	sc := &SCTPInit{
+		SCTPChunk:                      chunk,
+		InitiateTag:                    binary.BigEndian.Uint32(data[4:8]),
+		AdvertisedReceiverWindowCredit: binary.BigEndian.Uint32(data[8:12]),
+		OutboundStreams:                binary.BigEndian.Uint16(data[12:14]),
+		InboundStreams:                 binary.BigEndian.Uint16(data[14:16]),
+		InitialTSN:                     binary.BigEndian.Uint32(data[16:20]),
+	}
+	paramData := data[20:sc.ActualLength]
+	for len(paramData) > 0 {
+		p := SCTPInitParameter(decodeSCTPParameter(paramData))
+		paramData = paramData[p.ActualLength:]
+		sc.Parameters = append(sc.Parameters, p)
+	}
+	p.AddLayer(sc)
+	return p.NextDecoder(gopacket.DecodeFunc(decodeWithSCTPChunkTypePrefix))
+}
+
+// SerializeTo is for gopacket.SerializableLayer.
+func (sc SCTPInit) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	var payload []byte
+	for _, param := range sc.Parameters {
+		payload = append(payload, SCTPParameter(param).Bytes()...)
+	}
+	length := 20 + len(payload)
+	bytes, err := b.PrependBytes(roundUpToNearest4(length))
+	if err != nil {
+		return err
+	}
+	bytes[0] = uint8(sc.Type)
+	bytes[1] = sc.Flags
+	binary.BigEndian.PutUint16(bytes[2:4], uint16(length))
+	binary.BigEndian.PutUint32(bytes[4:8], sc.InitiateTag)
+	binary.BigEndian.PutUint32(bytes[8:12], sc.AdvertisedReceiverWindowCredit)
+	binary.BigEndian.PutUint16(bytes[12:14], sc.OutboundStreams)
+	binary.BigEndian.PutUint16(bytes[14:16], sc.InboundStreams)
+	binary.BigEndian.PutUint32(bytes[16:20], sc.InitialTSN)
+	copy(bytes[20:], payload)
+	return nil
+}
+
+// SCTPSack is the SCTP Selective ACK chunk layer.
+type SCTPSack struct {
+	SCTPChunk
+	CumulativeTSNAck               uint32
+	AdvertisedReceiverWindowCredit uint32
+	NumGapACKs, NumDuplicateTSNs   uint16
+	GapACKs                        []uint16
+	DuplicateTSNs                  []uint32
+}
+
+// LayerType return LayerTypeSCTPSack
+func (sc *SCTPSack) LayerType() gopacket.LayerType {
+	return LayerTypeSCTPSack
+}
+
+func decodeSCTPSack(data []byte, p gopacket.PacketBuilder) error {
+	chunk, err := decodeSCTPChunk(data)
+	if err != nil {
+		return err
+	}
+	sc := &SCTPSack{
+		SCTPChunk:                      chunk,
+		CumulativeTSNAck:               binary.BigEndian.Uint32(data[4:8]),
+		AdvertisedReceiverWindowCredit: binary.BigEndian.Uint32(data[8:12]),
+		NumGapACKs:                     binary.BigEndian.Uint16(data[12:14]),
+		NumDuplicateTSNs:               binary.BigEndian.Uint16(data[14:16]),
+	}
+	// We maximize gapAcks and dupTSNs here so we're not allocating tons
+	// of memory based on a user-controlable field.  Our maximums are not exact,
+	// but should give us sane defaults... we'll still hit slice boundaries and
+	// fail if the user-supplied values are too high (in the for loops below), but
+	// the amount of memory we'll have allocated because of that should be small
+	// (< sc.ActualLength)
+	gapAcks := sc.SCTPChunk.ActualLength / 2
+	dupTSNs := (sc.SCTPChunk.ActualLength - gapAcks*2) / 4
+	if gapAcks > int(sc.NumGapACKs) {
+		gapAcks = int(sc.NumGapACKs)
+	}
+	if dupTSNs > int(sc.NumDuplicateTSNs) {
+		dupTSNs = int(sc.NumDuplicateTSNs)
+	}
+	sc.GapACKs = make([]uint16, 0, gapAcks)
+	sc.DuplicateTSNs = make([]uint32, 0, dupTSNs)
+	bytesRemaining := data[16:]
+	for i := 0; i < int(sc.NumGapACKs); i++ {
+		sc.GapACKs = append(sc.GapACKs, binary.BigEndian.Uint16(bytesRemaining[:2]))
+		bytesRemaining = bytesRemaining[2:]
+	}
+	for i := 0; i < int(sc.NumDuplicateTSNs); i++ {
+		sc.DuplicateTSNs = append(sc.DuplicateTSNs, binary.BigEndian.Uint32(bytesRemaining[:4]))
+		bytesRemaining = bytesRemaining[4:]
+	}
+	p.AddLayer(sc)
+	return p.NextDecoder(gopacket.DecodeFunc(decodeWithSCTPChunkTypePrefix))
+}
+
+// SerializeTo is for gopacket.SerializableLayer.
+func (sc SCTPSack) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	length := 16 + 2*len(sc.GapACKs) + 4*len(sc.DuplicateTSNs)
+	bytes, err := b.PrependBytes(roundUpToNearest4(length))
+	if err != nil {
+		return err
+	}
+	bytes[0] = uint8(sc.Type)
+	bytes[1] = sc.Flags
+	binary.BigEndian.PutUint16(bytes[2:4], uint16(length))
+	binary.BigEndian.PutUint32(bytes[4:8], sc.CumulativeTSNAck)
+	binary.BigEndian.PutUint32(bytes[8:12], sc.AdvertisedReceiverWindowCredit)
+	binary.BigEndian.PutUint16(bytes[12:14], uint16(len(sc.GapACKs)))
+	binary.BigEndian.PutUint16(bytes[14:16], uint16(len(sc.DuplicateTSNs)))
+	for i, v := range sc.GapACKs {
+		binary.BigEndian.PutUint16(bytes[16+i*2:], v)
+	}
+	offset := 16 + 2*len(sc.GapACKs)
+	for i, v := range sc.DuplicateTSNs {
+		binary.BigEndian.PutUint32(bytes[offset+i*4:], v)
+	}
+	return nil
+}
+
+// SCTPHeartbeatParameter is the parameter type used by SCTP heartbeat and
+// heartbeat ack layers.
+type SCTPHeartbeatParameter SCTPParameter
+
+// SCTPHeartbeat is the SCTP heartbeat layer, also used for heatbeat ack.
+type SCTPHeartbeat struct {
+	SCTPChunk
+	Parameters []SCTPHeartbeatParameter
+}
+
+// LayerType returns gopacket.LayerTypeSCTPHeartbeat.
+func (sc *SCTPHeartbeat) LayerType() gopacket.LayerType {
+	if sc.Type == SCTPChunkTypeHeartbeatAck {
+		return LayerTypeSCTPHeartbeatAck
+	}
+	// sc.Type == SCTPChunkTypeHeartbeat
+	return LayerTypeSCTPHeartbeat
+}
+
+func decodeSCTPHeartbeat(data []byte, p gopacket.PacketBuilder) error {
+	chunk, err := decodeSCTPChunk(data)
+	if err != nil {
+		return err
+	}
+	sc := &SCTPHeartbeat{
+		SCTPChunk: chunk,
+	}
+	paramData := data[4:sc.Length]
+	for len(paramData) > 0 {
+		p := SCTPHeartbeatParameter(decodeSCTPParameter(paramData))
+		paramData = paramData[p.ActualLength:]
+		sc.Parameters = append(sc.Parameters, p)
+	}
+	p.AddLayer(sc)
+	return p.NextDecoder(gopacket.DecodeFunc(decodeWithSCTPChunkTypePrefix))
+}
+
+// SerializeTo is for gopacket.SerializableLayer.
+func (sc SCTPHeartbeat) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	var payload []byte
+	for _, param := range sc.Parameters {
+		payload = append(payload, SCTPParameter(param).Bytes()...)
+	}
+	length := 4 + len(payload)
+
+	bytes, err := b.PrependBytes(roundUpToNearest4(length))
+	if err != nil {
+		return err
+	}
+	bytes[0] = uint8(sc.Type)
+	bytes[1] = sc.Flags
+	binary.BigEndian.PutUint16(bytes[2:4], uint16(length))
+	copy(bytes[4:], payload)
+	return nil
+}
+
+// SCTPErrorParameter is the parameter type used by SCTP Abort and Error layers.
+type SCTPErrorParameter SCTPParameter
+
+// SCTPError is the SCTP error layer, also used for SCTP aborts.
+type SCTPError struct {
+	SCTPChunk
+	Parameters []SCTPErrorParameter
+}
+
+// LayerType returns LayerTypeSCTPAbort or LayerTypeSCTPError.
+func (sc *SCTPError) LayerType() gopacket.LayerType {
+	if sc.Type == SCTPChunkTypeAbort {
+		return LayerTypeSCTPAbort
+	}
+	// sc.Type == SCTPChunkTypeError
+	return LayerTypeSCTPError
+}
+
+func decodeSCTPError(data []byte, p gopacket.PacketBuilder) error {
+	// remarkably similar to decodeSCTPHeartbeat ;)
+	chunk, err := decodeSCTPChunk(data)
+	if err != nil {
+		return err
+	}
+	sc := &SCTPError{
+		SCTPChunk: chunk,
+	}
+	paramData := data[4:sc.Length]
+	for len(paramData) > 0 {
+		p := SCTPErrorParameter(decodeSCTPParameter(paramData))
+		paramData = paramData[p.ActualLength:]
+		sc.Parameters = append(sc.Parameters, p)
+	}
+	p.AddLayer(sc)
+	return p.NextDecoder(gopacket.DecodeFunc(decodeWithSCTPChunkTypePrefix))
+}
+
+// SerializeTo is for gopacket.SerializableLayer.
+func (sc SCTPError) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	var payload []byte
+	for _, param := range sc.Parameters {
+		payload = append(payload, SCTPParameter(param).Bytes()...)
+	}
+	length := 4 + len(payload)
+
+	bytes, err := b.PrependBytes(roundUpToNearest4(length))
+	if err != nil {
+		return err
+	}
+	bytes[0] = uint8(sc.Type)
+	bytes[1] = sc.Flags
+	binary.BigEndian.PutUint16(bytes[2:4], uint16(length))
+	copy(bytes[4:], payload)
+	return nil
+}
+
+// SCTPShutdown is the SCTP shutdown layer.
+type SCTPShutdown struct {
+	SCTPChunk
+	CumulativeTSNAck uint32
+}
+
+// LayerType returns gopacket.LayerTypeSCTPShutdown.
+func (sc *SCTPShutdown) LayerType() gopacket.LayerType { return LayerTypeSCTPShutdown }
+
+func decodeSCTPShutdown(data []byte, p gopacket.PacketBuilder) error {
+	chunk, err := decodeSCTPChunk(data)
+	if err != nil {
+		return err
+	}
+	sc := &SCTPShutdown{
+		SCTPChunk:        chunk,
+		CumulativeTSNAck: binary.BigEndian.Uint32(data[4:8]),
+	}
+	p.AddLayer(sc)
+	return p.NextDecoder(gopacket.DecodeFunc(decodeWithSCTPChunkTypePrefix))
+}
+
+// SerializeTo is for gopacket.SerializableLayer.
+func (sc SCTPShutdown) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	bytes, err := b.PrependBytes(8)
+	if err != nil {
+		return err
+	}
+	bytes[0] = uint8(sc.Type)
+	bytes[1] = sc.Flags
+	binary.BigEndian.PutUint16(bytes[2:4], 8)
+	binary.BigEndian.PutUint32(bytes[4:8], sc.CumulativeTSNAck)
+	return nil
+}
+
+// SCTPShutdownAck is the SCTP shutdown layer.
+type SCTPShutdownAck struct {
+	SCTPChunk
+}
+
+// LayerType returns gopacket.LayerTypeSCTPShutdownAck.
+func (sc *SCTPShutdownAck) LayerType() gopacket.LayerType { return LayerTypeSCTPShutdownAck }
+
+func decodeSCTPShutdownAck(data []byte, p gopacket.PacketBuilder) error {
+	chunk, err := decodeSCTPChunk(data)
+	if err != nil {
+		return err
+	}
+	sc := &SCTPShutdownAck{
+		SCTPChunk: chunk,
+	}
+	p.AddLayer(sc)
+	return p.NextDecoder(gopacket.DecodeFunc(decodeWithSCTPChunkTypePrefix))
+}
+
+// SerializeTo is for gopacket.SerializableLayer.
+func (sc SCTPShutdownAck) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	bytes, err := b.PrependBytes(4)
+	if err != nil {
+		return err
+	}
+	bytes[0] = uint8(sc.Type)
+	bytes[1] = sc.Flags
+	binary.BigEndian.PutUint16(bytes[2:4], 4)
+	return nil
+}
+
+// SCTPCookieEcho is the SCTP Cookie Echo layer.
+type SCTPCookieEcho struct {
+	SCTPChunk
+	Cookie []byte
+}
+
+// LayerType returns gopacket.LayerTypeSCTPCookieEcho.
+func (sc *SCTPCookieEcho) LayerType() gopacket.LayerType { return LayerTypeSCTPCookieEcho }
+
+func decodeSCTPCookieEcho(data []byte, p gopacket.PacketBuilder) error {
+	chunk, err := decodeSCTPChunk(data)
+	if err != nil {
+		return err
+	}
+	sc := &SCTPCookieEcho{
+		SCTPChunk: chunk,
+	}
+	sc.Cookie = data[4:sc.Length]
+	p.AddLayer(sc)
+	return p.NextDecoder(gopacket.DecodeFunc(decodeWithSCTPChunkTypePrefix))
+}
+
+// SerializeTo is for gopacket.SerializableLayer.
+func (sc SCTPCookieEcho) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	length := 4 + len(sc.Cookie)
+	bytes, err := b.PrependBytes(roundUpToNearest4(length))
+	if err != nil {
+		return err
+	}
+	bytes[0] = uint8(sc.Type)
+	bytes[1] = sc.Flags
+	binary.BigEndian.PutUint16(bytes[2:4], uint16(length))
+	copy(bytes[4:], sc.Cookie)
+	return nil
+}
+
+// This struct is used by all empty SCTP chunks (currently CookieAck and
+// ShutdownComplete).
+type SCTPEmptyLayer struct {
+	SCTPChunk
+}
+
+// LayerType returns either gopacket.LayerTypeSCTPShutdownComplete or
+// LayerTypeSCTPCookieAck.
+func (sc *SCTPEmptyLayer) LayerType() gopacket.LayerType {
+	if sc.Type == SCTPChunkTypeShutdownComplete {
+		return LayerTypeSCTPShutdownComplete
+	}
+	// sc.Type == SCTPChunkTypeCookieAck
+	return LayerTypeSCTPCookieAck
+}
+
+func decodeSCTPEmptyLayer(data []byte, p gopacket.PacketBuilder) error {
+	chunk, err := decodeSCTPChunk(data)
+	if err != nil {
+		return err
+	}
+	sc := &SCTPEmptyLayer{
+		SCTPChunk: chunk,
+	}
+	p.AddLayer(sc)
+	return p.NextDecoder(gopacket.DecodeFunc(decodeWithSCTPChunkTypePrefix))
+}
+
+// SerializeTo is for gopacket.SerializableLayer.
+func (sc SCTPEmptyLayer) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	bytes, err := b.PrependBytes(4)
+	if err != nil {
+		return err
+	}
+	bytes[0] = uint8(sc.Type)
+	bytes[1] = sc.Flags
+	binary.BigEndian.PutUint16(bytes[2:4], 4)
+	return nil
+}

vendor/github.com/google/gopacket/layers/sip.go

@@ -0,0 +1,542 @@
+// Copyright 2017 Google, Inc. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+package layers
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"strconv"
+	"strings"
+
+	"github.com/google/gopacket"
+)
+
+// SIPVersion defines the different versions of the SIP Protocol
+type SIPVersion uint8
+
+// Represents all the versions of SIP protocol
+const (
+	SIPVersion1 SIPVersion = 1
+	SIPVersion2 SIPVersion = 2
+)
+
+func (sv SIPVersion) String() string {
+	switch sv {
+	default:
+		// Defaulting to SIP/2.0
+		return "SIP/2.0"
+	case SIPVersion1:
+		return "SIP/1.0"
+	case SIPVersion2:
+		return "SIP/2.0"
+	}
+}
+
+// GetSIPVersion is used to get SIP version constant
+func GetSIPVersion(version string) (SIPVersion, error) {
+	switch strings.ToUpper(version) {
+	case "SIP/1.0":
+		return SIPVersion1, nil
+	case "SIP/2.0":
+		return SIPVersion2, nil
+	default:
+		return 0, fmt.Errorf("Unknown SIP version: '%s'", version)
+
+	}
+}
+
+// SIPMethod defines the different methods of the SIP Protocol
+// defined in the different RFC's
+type SIPMethod uint16
+
+// Here are all the SIP methods
+const (
+	SIPMethodInvite    SIPMethod = 1  // INVITE	[RFC3261]
+	SIPMethodAck       SIPMethod = 2  // ACK	[RFC3261]
+	SIPMethodBye       SIPMethod = 3  // BYE	[RFC3261]
+	SIPMethodCancel    SIPMethod = 4  // CANCEL	[RFC3261]
+	SIPMethodOptions   SIPMethod = 5  // OPTIONS	[RFC3261]
+	SIPMethodRegister  SIPMethod = 6  // REGISTER	[RFC3261]
+	SIPMethodPrack     SIPMethod = 7  // PRACK	[RFC3262]
+	SIPMethodSubscribe SIPMethod = 8  // SUBSCRIBE	[RFC6665]
+	SIPMethodNotify    SIPMethod = 9  // NOTIFY	[RFC6665]
+	SIPMethodPublish   SIPMethod = 10 // PUBLISH	[RFC3903]
+	SIPMethodInfo      SIPMethod = 11 // INFO	[RFC6086]
+	SIPMethodRefer     SIPMethod = 12 // REFER	[RFC3515]
+	SIPMethodMessage   SIPMethod = 13 // MESSAGE	[RFC3428]
+	SIPMethodUpdate    SIPMethod = 14 // UPDATE	[RFC3311]
+	SIPMethodPing      SIPMethod = 15 // PING	[https://tools.ietf.org/html/draft-fwmiller-ping-03]
+)
+
+func (sm SIPMethod) String() string {
+	switch sm {
+	default:
+		return "Unknown method"
+	case SIPMethodInvite:
+		return "INVITE"
+	case SIPMethodAck:
+		return "ACK"
+	case SIPMethodBye:
+		return "BYE"
+	case SIPMethodCancel:
+		return "CANCEL"
+	case SIPMethodOptions:
+		return "OPTIONS"
+	case SIPMethodRegister:
+		return "REGISTER"
+	case SIPMethodPrack:
+		return "PRACK"
+	case SIPMethodSubscribe:
+		return "SUBSCRIBE"
+	case SIPMethodNotify:
+		return "NOTIFY"
+	case SIPMethodPublish:
+		return "PUBLISH"
+	case SIPMethodInfo:
+		return "INFO"
+	case SIPMethodRefer:
+		return "REFER"
+	case SIPMethodMessage:
+		return "MESSAGE"
+	case SIPMethodUpdate:
+		return "UPDATE"
+	case SIPMethodPing:
+		return "PING"
+	}
+}
+
+// GetSIPMethod returns the constant of a SIP method
+// from its string
+func GetSIPMethod(method string) (SIPMethod, error) {
+	switch strings.ToUpper(method) {
+	case "INVITE":
+		return SIPMethodInvite, nil
+	case "ACK":
+		return SIPMethodAck, nil
+	case "BYE":
+		return SIPMethodBye, nil
+	case "CANCEL":
+		return SIPMethodCancel, nil
+	case "OPTIONS":
+		return SIPMethodOptions, nil
+	case "REGISTER":
+		return SIPMethodRegister, nil
+	case "PRACK":
+		return SIPMethodPrack, nil
+	case "SUBSCRIBE":
+		return SIPMethodSubscribe, nil
+	case "NOTIFY":
+		return SIPMethodNotify, nil
+	case "PUBLISH":
+		return SIPMethodPublish, nil
+	case "INFO":
+		return SIPMethodInfo, nil
+	case "REFER":
+		return SIPMethodRefer, nil
+	case "MESSAGE":
+		return SIPMethodMessage, nil
+	case "UPDATE":
+		return SIPMethodUpdate, nil
+	case "PING":
+		return SIPMethodPing, nil
+	default:
+		return 0, fmt.Errorf("Unknown SIP method: '%s'", method)
+	}
+}
+
+// Here is a correspondance between long header names and short
+// as defined in rfc3261 in section 20
+var compactSipHeadersCorrespondance = map[string]string{
+	"accept-contact":      "a",
+	"allow-events":        "u",
+	"call-id":             "i",
+	"contact":             "m",
+	"content-encoding":    "e",
+	"content-length":      "l",
+	"content-type":        "c",
+	"event":               "o",
+	"from":                "f",
+	"identity":            "y",
+	"refer-to":            "r",
+	"referred-by":         "b",
+	"reject-contact":      "j",
+	"request-disposition": "d",
+	"session-expires":     "x",
+	"subject":             "s",
+	"supported":           "k",
+	"to":                  "t",
+	"via":                 "v",
+}
+
+// SIP object will contains information about decoded SIP packet.
+// -> The SIP Version
+// -> The SIP Headers (in a map[string][]string because of multiple headers with the same name
+// -> The SIP Method
+// -> The SIP Response code (if it's a response)
+// -> The SIP Status line (if it's a response)
+// You can easily know the type of the packet with the IsResponse boolean
+//
+type SIP struct {
+	BaseLayer
+
+	// Base information
+	Version SIPVersion
+	Method  SIPMethod
+	Headers map[string][]string
+
+	// Request
+	RequestURI string
+
+	// Response
+	IsResponse     bool
+	ResponseCode   int
+	ResponseStatus string
+
+	// Private fields
+	cseq             int64
+	contentLength    int64
+	lastHeaderParsed string
+}
+
+// decodeSIP decodes the byte slice into a SIP type. It also
+// setups the application Layer in PacketBuilder.
+func decodeSIP(data []byte, p gopacket.PacketBuilder) error {
+	s := NewSIP()
+	err := s.DecodeFromBytes(data, p)
+	if err != nil {
+		return err
+	}
+	p.AddLayer(s)
+	p.SetApplicationLayer(s)
+	return nil
+}
+
+// NewSIP instantiates a new empty SIP object
+func NewSIP() *SIP {
+	s := new(SIP)
+	s.Headers = make(map[string][]string)
+	return s
+}
+
+// LayerType returns gopacket.LayerTypeSIP.
+func (s *SIP) LayerType() gopacket.LayerType {
+	return LayerTypeSIP
+}
+
+// Payload returns the base layer payload
+func (s *SIP) Payload() []byte {
+	return s.BaseLayer.Payload
+}
+
+// CanDecode returns the set of layer types that this DecodingLayer can decode
+func (s *SIP) CanDecode() gopacket.LayerClass {
+	return LayerTypeSIP
+}
+
+// NextLayerType returns the layer type contained by this DecodingLayer
+func (s *SIP) NextLayerType() gopacket.LayerType {
+	return gopacket.LayerTypePayload
+}
+
+// DecodeFromBytes decodes the slice into the SIP struct.
+func (s *SIP) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+	// Init some vars for parsing follow-up
+	var countLines int
+	var line []byte
+	var err error
+	var offset int
+
+	// Iterate on all lines of the SIP Headers
+	// and stop when we reach the SDP (aka when the new line
+	// is at index 0 of the remaining packet)
+	buffer := bytes.NewBuffer(data)
+
+	for {
+
+		// Read next line
+		line, err = buffer.ReadBytes(byte('\n'))
+		if err != nil {
+			if err == io.EOF {
+				if len(bytes.Trim(line, "\r\n")) > 0 {
+					df.SetTruncated()
+				}
+				break
+			} else {
+				return err
+			}
+		}
+		offset += len(line)
+
+		// Trim the new line delimiters
+		line = bytes.Trim(line, "\r\n")
+
+		// Empty line, we hit Body
+		if len(line) == 0 {
+			break
+		}
+
+		// First line is the SIP request/response line
+		// Other lines are headers
+		if countLines == 0 {
+			err = s.ParseFirstLine(line)
+			if err != nil {
+				return err
+			}
+
+		} else {
+			err = s.ParseHeader(line)
+			if err != nil {
+				return err
+			}
+		}
+
+		countLines++
+	}
+	s.BaseLayer = BaseLayer{Contents: data[:offset], Payload: data[offset:]}
+
+	return nil
+}
+
+// ParseFirstLine will compute the first line of a SIP packet.
+// The first line will tell us if it's a request or a response.
+//
+// Examples of first line of SIP Prococol :
+//
+// 	Request 	: INVITE bob@example.com SIP/2.0
+// 	Response 	: SIP/2.0 200 OK
+// 	Response	: SIP/2.0 501 Not Implemented
+//
+func (s *SIP) ParseFirstLine(firstLine []byte) error {
+
+	var err error
+
+	// Splits line by space
+	splits := strings.SplitN(string(firstLine), " ", 3)
+
+	// We must have at least 3 parts
+	if len(splits) < 3 {
+		return fmt.Errorf("invalid first SIP line: '%s'", string(firstLine))
+	}
+
+	// Determine the SIP packet type
+	if strings.HasPrefix(splits[0], "SIP") {
+
+		// --> Response
+		s.IsResponse = true
+
+		// Validate SIP Version
+		s.Version, err = GetSIPVersion(splits[0])
+		if err != nil {
+			return err
+		}
+
+		// Compute code
+		s.ResponseCode, err = strconv.Atoi(splits[1])
+		if err != nil {
+			return err
+		}
+
+		// Compute status line
+		s.ResponseStatus = splits[2]
+
+	} else {
+
+		// --> Request
+
+		// Validate method
+		s.Method, err = GetSIPMethod(splits[0])
+		if err != nil {
+			return err
+		}
+
+		s.RequestURI = splits[1]
+
+		// Validate SIP Version
+		s.Version, err = GetSIPVersion(splits[2])
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+// ParseHeader will parse a SIP Header
+// SIP Headers are quite simple, there are colon separated name and value
+// Headers can be spread over multiple lines
+//
+// Examples of header :
+//
+//  CSeq: 1 REGISTER
+//  Via: SIP/2.0/UDP there.com:5060
+//  Authorization:Digest username="UserB",
+//	  realm="MCI WorldCom SIP",
+//    nonce="1cec4341ae6cbe5a359ea9c8e88df84f", opaque="",
+//    uri="sip:ss2.wcom.com", response="71ba27c64bd01de719686aa4590d5824"
+//
+func (s *SIP) ParseHeader(header []byte) (err error) {
+
+	// Ignore empty headers
+	if len(header) == 0 {
+		return
+	}
+
+	// Check if this is the following of last header
+	// RFC 3261 - 7.3.1 - Header Field Format specify that following lines of
+	// multiline headers must begin by SP or TAB
+	if header[0] == '\t' || header[0] == ' ' {
+
+		header = bytes.TrimSpace(header)
+		s.Headers[s.lastHeaderParsed][len(s.Headers[s.lastHeaderParsed])-1] += fmt.Sprintf(" %s", string(header))
+		return
+	}
+
+	// Find the ':' to separate header name and value
+	index := bytes.Index(header, []byte(":"))
+	if index >= 0 {
+
+		headerName := strings.ToLower(string(bytes.Trim(header[:index], " ")))
+		headerValue := string(bytes.Trim(header[index+1:], " "))
+
+		// Add header to object
+		s.Headers[headerName] = append(s.Headers[headerName], headerValue)
+		s.lastHeaderParsed = headerName
+
+		// Compute specific headers
+		err = s.ParseSpecificHeaders(headerName, headerValue)
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+// ParseSpecificHeaders will parse some specific key values from
+// specific headers like CSeq or Content-Length integer values
+func (s *SIP) ParseSpecificHeaders(headerName string, headerValue string) (err error) {
+
+	switch headerName {
+	case "cseq":
+
+		// CSeq header value is formatted like that :
+		// CSeq: 123 INVITE
+		// We split the value to parse Cseq integer value, and method
+		splits := strings.Split(headerValue, " ")
+		if len(splits) > 1 {
+
+			// Parse Cseq
+			s.cseq, err = strconv.ParseInt(splits[0], 10, 64)
+			if err != nil {
+				return err
+			}
+
+			// Validate method
+			if s.IsResponse {
+				s.Method, err = GetSIPMethod(splits[1])
+				if err != nil {
+					return err
+				}
+			}
+		}
+
+	case "content-length":
+
+		// Parse Content-Length
+		s.contentLength, err = strconv.ParseInt(headerValue, 10, 64)
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+// GetAllHeaders will return the full headers of the
+// current SIP packets in a map[string][]string
+func (s *SIP) GetAllHeaders() map[string][]string {
+	return s.Headers
+}
+
+// GetHeader will return all the headers with
+// the specified name.
+func (s *SIP) GetHeader(headerName string) []string {
+	headerName = strings.ToLower(headerName)
+	h := make([]string, 0)
+	if _, ok := s.Headers[headerName]; ok {
+		return s.Headers[headerName]
+	}
+	compactHeader := compactSipHeadersCorrespondance[headerName]
+	if _, ok := s.Headers[compactHeader]; ok {
+		return s.Headers[compactHeader]
+	}
+	return h
+}
+
+// GetFirstHeader will return the first header with
+// the specified name. If the current SIP packet has multiple
+// headers with the same name, it returns the first.
+func (s *SIP) GetFirstHeader(headerName string) string {
+	headers := s.GetHeader(headerName)
+	if len(headers) > 0 {
+		return headers[0]
+	}
+	return ""
+}
+
+//
+// Some handy getters for most used SIP headers
+//
+
+// GetAuthorization will return the Authorization
+// header of the current SIP packet
+func (s *SIP) GetAuthorization() string {
+	return s.GetFirstHeader("Authorization")
+}
+
+// GetFrom will return the From
+// header of the current SIP packet
+func (s *SIP) GetFrom() string {
+	return s.GetFirstHeader("From")
+}
+
+// GetTo will return the To
+// header of the current SIP packet
+func (s *SIP) GetTo() string {
+	return s.GetFirstHeader("To")
+}
+
+// GetContact will return the Contact
+// header of the current SIP packet
+func (s *SIP) GetContact() string {
+	return s.GetFirstHeader("Contact")
+}
+
+// GetCallID will return the Call-ID
+// header of the current SIP packet
+func (s *SIP) GetCallID() string {
+	return s.GetFirstHeader("Call-ID")
+}
+
+// GetUserAgent will return the User-Agent
+// header of the current SIP packet
+func (s *SIP) GetUserAgent() string {
+	return s.GetFirstHeader("User-Agent")
+}
+
+// GetContentLength will return the parsed integer
+// Content-Length header of the current SIP packet
+func (s *SIP) GetContentLength() int64 {
+	return s.contentLength
+}
+
+// GetCSeq will return the parsed integer CSeq header
+// header of the current SIP packet
+func (s *SIP) GetCSeq() int64 {
+	return s.cseq
+}

vendor/github.com/google/gopacket/layers/stp.go

@@ -0,0 +1,27 @@
+// Copyright 2017 Google, Inc. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+package layers
+
+import (
+	"github.com/google/gopacket"
+)
+
+// STP decode spanning tree protocol packets to transport BPDU (bridge protocol data unit) message.
+type STP struct {
+	BaseLayer
+}
+
+// LayerType returns gopacket.LayerTypeSTP.
+func (s *STP) LayerType() gopacket.LayerType { return LayerTypeSTP }
+
+func decodeSTP(data []byte, p gopacket.PacketBuilder) error {
+	stp := &STP{}
+	stp.Contents = data[:]
+	// TODO:  parse the STP protocol into actual subfields.
+	p.AddLayer(stp)
+	return nil
+}

vendor/github.com/google/gopacket/layers/tcp.go

@@ -0,0 +1,341 @@
+// Copyright 2012 Google, Inc. All rights reserved.
+// Copyright 2009-2011 Andreas Krennmair. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+package layers
+
+import (
+	"encoding/binary"
+	"encoding/hex"
+	"errors"
+	"fmt"
+
+	"github.com/google/gopacket"
+)
+
+// TCP is the layer for TCP headers.
+type TCP struct {
+	BaseLayer
+	SrcPort, DstPort                           TCPPort
+	Seq                                        uint32
+	Ack                                        uint32
+	DataOffset                                 uint8
+	FIN, SYN, RST, PSH, ACK, URG, ECE, CWR, NS bool
+	Window                                     uint16
+	Checksum                                   uint16
+	Urgent                                     uint16
+	sPort, dPort                               []byte
+	Options                                    []TCPOption
+	Padding                                    []byte
+	opts                                       [4]TCPOption
+	tcpipchecksum
+}
+
+// TCPOptionKind represents a TCP option code.
+type TCPOptionKind uint8
+
+const (
+	TCPOptionKindEndList                         = 0
+	TCPOptionKindNop                             = 1
+	TCPOptionKindMSS                             = 2  // len = 4
+	TCPOptionKindWindowScale                     = 3  // len = 3
+	TCPOptionKindSACKPermitted                   = 4  // len = 2
+	TCPOptionKindSACK                            = 5  // len = n
+	TCPOptionKindEcho                            = 6  // len = 6, obsolete
+	TCPOptionKindEchoReply                       = 7  // len = 6, obsolete
+	TCPOptionKindTimestamps                      = 8  // len = 10
+	TCPOptionKindPartialOrderConnectionPermitted = 9  // len = 2, obsolete
+	TCPOptionKindPartialOrderServiceProfile      = 10 // len = 3, obsolete
+	TCPOptionKindCC                              = 11 // obsolete
+	TCPOptionKindCCNew                           = 12 // obsolete
+	TCPOptionKindCCEcho                          = 13 // obsolete
+	TCPOptionKindAltChecksum                     = 14 // len = 3, obsolete
+	TCPOptionKindAltChecksumData                 = 15 // len = n, obsolete
+)
+
+func (k TCPOptionKind) String() string {
+	switch k {
+	case TCPOptionKindEndList:
+		return "EndList"
+	case TCPOptionKindNop:
+		return "NOP"
+	case TCPOptionKindMSS:
+		return "MSS"
+	case TCPOptionKindWindowScale:
+		return "WindowScale"
+	case TCPOptionKindSACKPermitted:
+		return "SACKPermitted"
+	case TCPOptionKindSACK:
+		return "SACK"
+	case TCPOptionKindEcho:
+		return "Echo"
+	case TCPOptionKindEchoReply:
+		return "EchoReply"
+	case TCPOptionKindTimestamps:
+		return "Timestamps"
+	case TCPOptionKindPartialOrderConnectionPermitted:
+		return "PartialOrderConnectionPermitted"
+	case TCPOptionKindPartialOrderServiceProfile:
+		return "PartialOrderServiceProfile"
+	case TCPOptionKindCC:
+		return "CC"
+	case TCPOptionKindCCNew:
+		return "CCNew"
+	case TCPOptionKindCCEcho:
+		return "CCEcho"
+	case TCPOptionKindAltChecksum:
+		return "AltChecksum"
+	case TCPOptionKindAltChecksumData:
+		return "AltChecksumData"
+	default:
+		return fmt.Sprintf("Unknown(%d)", k)
+	}
+}
+
+type TCPOption struct {
+	OptionType   TCPOptionKind
+	OptionLength uint8
+	OptionData   []byte
+}
+
+func (t TCPOption) String() string {
+	hd := hex.EncodeToString(t.OptionData)
+	if len(hd) > 0 {
+		hd = " 0x" + hd
+	}
+	switch t.OptionType {
+	case TCPOptionKindMSS:
+		if len(t.OptionData) >= 2 {
+			return fmt.Sprintf("TCPOption(%s:%v%s)",
+				t.OptionType,
+				binary.BigEndian.Uint16(t.OptionData),
+				hd)
+		}
+
+	case TCPOptionKindTimestamps:
+		if len(t.OptionData) == 8 {
+			return fmt.Sprintf("TCPOption(%s:%v/%v%s)",
+				t.OptionType,
+				binary.BigEndian.Uint32(t.OptionData[:4]),
+				binary.BigEndian.Uint32(t.OptionData[4:8]),
+				hd)
+		}
+	}
+	return fmt.Sprintf("TCPOption(%s:%s)", t.OptionType, hd)
+}
+
+// LayerType returns gopacket.LayerTypeTCP
+func (t *TCP) LayerType() gopacket.LayerType { return LayerTypeTCP }
+
+// SerializeTo writes the serialized form of this layer into the
+// SerializationBuffer, implementing gopacket.SerializableLayer.
+// See the docs for gopacket.SerializableLayer for more info.
+func (t *TCP) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	var optionLength int
+	for _, o := range t.Options {
+		switch o.OptionType {
+		case 0, 1:
+			optionLength += 1
+		default:
+			optionLength += 2 + len(o.OptionData)
+		}
+	}
+	if opts.FixLengths {
+		if rem := optionLength % 4; rem != 0 {
+			t.Padding = lotsOfZeros[:4-rem]
+		}
+		t.DataOffset = uint8((len(t.Padding) + optionLength + 20) / 4)
+	}
+	bytes, err := b.PrependBytes(20 + optionLength + len(t.Padding))
+	if err != nil {
+		return err
+	}
+	binary.BigEndian.PutUint16(bytes, uint16(t.SrcPort))
+	binary.BigEndian.PutUint16(bytes[2:], uint16(t.DstPort))
+	binary.BigEndian.PutUint32(bytes[4:], t.Seq)
+	binary.BigEndian.PutUint32(bytes[8:], t.Ack)
+	binary.BigEndian.PutUint16(bytes[12:], t.flagsAndOffset())
+	binary.BigEndian.PutUint16(bytes[14:], t.Window)
+	binary.BigEndian.PutUint16(bytes[18:], t.Urgent)
+	start := 20
+	for _, o := range t.Options {
+		bytes[start] = byte(o.OptionType)
+		switch o.OptionType {
+		case 0, 1:
+			start++
+		default:
+			if opts.FixLengths {
+				o.OptionLength = uint8(len(o.OptionData) + 2)
+			}
+			bytes[start+1] = o.OptionLength
+			copy(bytes[start+2:start+len(o.OptionData)+2], o.OptionData)
+			start += len(o.OptionData) + 2
+		}
+	}
+	copy(bytes[start:], t.Padding)
+	if opts.ComputeChecksums {
+		// zero out checksum bytes in current serialization.
+		bytes[16] = 0
+		bytes[17] = 0
+		csum, err := t.computeChecksum(b.Bytes(), IPProtocolTCP)
+		if err != nil {
+			return err
+		}
+		t.Checksum = csum
+	}
+	binary.BigEndian.PutUint16(bytes[16:], t.Checksum)
+	return nil
+}
+
+func (t *TCP) ComputeChecksum() (uint16, error) {
+	return t.computeChecksum(append(t.Contents, t.Payload...), IPProtocolTCP)
+}
+
+func (t *TCP) flagsAndOffset() uint16 {
+	f := uint16(t.DataOffset) << 12
+	if t.FIN {
+		f |= 0x0001
+	}
+	if t.SYN {
+		f |= 0x0002
+	}
+	if t.RST {
+		f |= 0x0004
+	}
+	if t.PSH {
+		f |= 0x0008
+	}
+	if t.ACK {
+		f |= 0x0010
+	}
+	if t.URG {
+		f |= 0x0020
+	}
+	if t.ECE {
+		f |= 0x0040
+	}
+	if t.CWR {
+		f |= 0x0080
+	}
+	if t.NS {
+		f |= 0x0100
+	}
+	return f
+}
+
+func (tcp *TCP) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+	if len(data) < 20 {
+		df.SetTruncated()
+		return fmt.Errorf("Invalid TCP header. Length %d less than 20", len(data))
+	}
+	tcp.SrcPort = TCPPort(binary.BigEndian.Uint16(data[0:2]))
+	tcp.sPort = data[0:2]
+	tcp.DstPort = TCPPort(binary.BigEndian.Uint16(data[2:4]))
+	tcp.dPort = data[2:4]
+	tcp.Seq = binary.BigEndian.Uint32(data[4:8])
+	tcp.Ack = binary.BigEndian.Uint32(data[8:12])
+	tcp.DataOffset = data[12] >> 4
+	tcp.FIN = data[13]&0x01 != 0
+	tcp.SYN = data[13]&0x02 != 0
+	tcp.RST = data[13]&0x04 != 0
+	tcp.PSH = data[13]&0x08 != 0
+	tcp.ACK = data[13]&0x10 != 0
+	tcp.URG = data[13]&0x20 != 0
+	tcp.ECE = data[13]&0x40 != 0
+	tcp.CWR = data[13]&0x80 != 0
+	tcp.NS = data[12]&0x01 != 0
+	tcp.Window = binary.BigEndian.Uint16(data[14:16])
+	tcp.Checksum = binary.BigEndian.Uint16(data[16:18])
+	tcp.Urgent = binary.BigEndian.Uint16(data[18:20])
+	if tcp.Options == nil {
+		// Pre-allocate to avoid allocating a slice.
+		tcp.Options = tcp.opts[:0]
+	} else {
+		tcp.Options = tcp.Options[:0]
+	}
+	tcp.Padding = tcp.Padding[:0]
+	if tcp.DataOffset < 5 {
+		return fmt.Errorf("Invalid TCP data offset %d < 5", tcp.DataOffset)
+	}
+	dataStart := int(tcp.DataOffset) * 4
+	if dataStart > len(data) {
+		df.SetTruncated()
+		tcp.Payload = nil
+		tcp.Contents = data
+		return errors.New("TCP data offset greater than packet length")
+	}
+	tcp.Contents = data[:dataStart]
+	tcp.Payload = data[dataStart:]
+	// From here on, data points just to the header options.
+	data = data[20:dataStart]
+OPTIONS:
+	for len(data) > 0 {
+		tcp.Options = append(tcp.Options, TCPOption{OptionType: TCPOptionKind(data[0])})
+		opt := &tcp.Options[len(tcp.Options)-1]
+		switch opt.OptionType {
+		case TCPOptionKindEndList: // End of options
+			opt.OptionLength = 1
+			tcp.Padding = data[1:]
+			break OPTIONS
+		case TCPOptionKindNop: // 1 byte padding
+			opt.OptionLength = 1
+		default:
+			if len(data) < 2 {
+				df.SetTruncated()
+				return fmt.Errorf("Invalid TCP option length. Length %d less than 2", len(data))
+			}
+			opt.OptionLength = data[1]
+			if opt.OptionLength < 2 {
+				return fmt.Errorf("Invalid TCP option length %d < 2", opt.OptionLength)
+			} else if int(opt.OptionLength) > len(data) {
+				df.SetTruncated()
+				return fmt.Errorf("Invalid TCP option length %d exceeds remaining %d bytes", opt.OptionLength, len(data))
+			}
+			opt.OptionData = data[2:opt.OptionLength]
+		}
+		data = data[opt.OptionLength:]
+	}
+	return nil
+}
+
+func (t *TCP) CanDecode() gopacket.LayerClass {
+	return LayerTypeTCP
+}
+
+func (t *TCP) NextLayerType() gopacket.LayerType {
+	lt := t.DstPort.LayerType()
+	if lt == gopacket.LayerTypePayload {
+		lt = t.SrcPort.LayerType()
+	}
+	return lt
+}
+
+func decodeTCP(data []byte, p gopacket.PacketBuilder) error {
+	tcp := &TCP{}
+	err := tcp.DecodeFromBytes(data, p)
+	p.AddLayer(tcp)
+	p.SetTransportLayer(tcp)
+	if err != nil {
+		return err
+	}
+	if p.DecodeOptions().DecodeStreamsAsDatagrams {
+		return p.NextDecoder(tcp.NextLayerType())
+	} else {
+		return p.NextDecoder(gopacket.LayerTypePayload)
+	}
+}
+
+func (t *TCP) TransportFlow() gopacket.Flow {
+	return gopacket.NewFlow(EndpointTCPPort, t.sPort, t.dPort)
+}
+
+// For testing only
+func (t *TCP) SetInternalPortsForTesting() {
+	t.sPort = make([]byte, 2)
+	t.dPort = make([]byte, 2)
+	binary.BigEndian.PutUint16(t.sPort, uint16(t.SrcPort))
+	binary.BigEndian.PutUint16(t.dPort, uint16(t.DstPort))
+}

vendor/github.com/google/gopacket/layers/tcpip.go

@@ -0,0 +1,104 @@
+// Copyright 2012 Google, Inc. All rights reserved.
+// Copyright 2009-2011 Andreas Krennmair. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+package layers
+
+import (
+	"errors"
+	"fmt"
+
+	"github.com/google/gopacket"
+)
+
+// Checksum computation for TCP/UDP.
+type tcpipchecksum struct {
+	pseudoheader tcpipPseudoHeader
+}
+
+type tcpipPseudoHeader interface {
+	pseudoheaderChecksum() (uint32, error)
+}
+
+func (ip *IPv4) pseudoheaderChecksum() (csum uint32, err error) {
+	if err := ip.AddressTo4(); err != nil {
+		return 0, err
+	}
+	csum += (uint32(ip.SrcIP[0]) + uint32(ip.SrcIP[2])) << 8
+	csum += uint32(ip.SrcIP[1]) + uint32(ip.SrcIP[3])
+	csum += (uint32(ip.DstIP[0]) + uint32(ip.DstIP[2])) << 8
+	csum += uint32(ip.DstIP[1]) + uint32(ip.DstIP[3])
+	return csum, nil
+}
+
+func (ip *IPv6) pseudoheaderChecksum() (csum uint32, err error) {
+	if err := ip.AddressTo16(); err != nil {
+		return 0, err
+	}
+	for i := 0; i < 16; i += 2 {
+		csum += uint32(ip.SrcIP[i]) << 8
+		csum += uint32(ip.SrcIP[i+1])
+		csum += uint32(ip.DstIP[i]) << 8
+		csum += uint32(ip.DstIP[i+1])
+	}
+	return csum, nil
+}
+
+// Calculate the TCP/IP checksum defined in rfc1071.  The passed-in csum is any
+// initial checksum data that's already been computed.
+func tcpipChecksum(data []byte, csum uint32) uint16 {
+	// to handle odd lengths, we loop to length - 1, incrementing by 2, then
+	// handle the last byte specifically by checking against the original
+	// length.
+	length := len(data) - 1
+	for i := 0; i < length; i += 2 {
+		// For our test packet, doing this manually is about 25% faster
+		// (740 ns vs. 1000ns) than doing it by calling binary.BigEndian.Uint16.
+		csum += uint32(data[i]) << 8
+		csum += uint32(data[i+1])
+	}
+	if len(data)%2 == 1 {
+		csum += uint32(data[length]) << 8
+	}
+	for csum > 0xffff {
+		csum = (csum >> 16) + (csum & 0xffff)
+	}
+	return ^uint16(csum)
+}
+
+// computeChecksum computes a TCP or UDP checksum.  headerAndPayload is the
+// serialized TCP or UDP header plus its payload, with the checksum zero'd
+// out. headerProtocol is the IP protocol number of the upper-layer header.
+func (c *tcpipchecksum) computeChecksum(headerAndPayload []byte, headerProtocol IPProtocol) (uint16, error) {
+	if c.pseudoheader == nil {
+		return 0, errors.New("TCP/IP layer 4 checksum cannot be computed without network layer... call SetNetworkLayerForChecksum to set which layer to use")
+	}
+	length := uint32(len(headerAndPayload))
+	csum, err := c.pseudoheader.pseudoheaderChecksum()
+	if err != nil {
+		return 0, err
+	}
+	csum += uint32(headerProtocol)
+	csum += length & 0xffff
+	csum += length >> 16
+	return tcpipChecksum(headerAndPayload, csum), nil
+}
+
+// SetNetworkLayerForChecksum tells this layer which network layer is wrapping it.
+// This is needed for computing the checksum when serializing, since TCP/IP transport
+// layer checksums depends on fields in the IPv4 or IPv6 layer that contains it.
+// The passed in layer must be an *IPv4 or *IPv6.
+func (i *tcpipchecksum) SetNetworkLayerForChecksum(l gopacket.NetworkLayer) error {
+	switch v := l.(type) {
+	case *IPv4:
+		i.pseudoheader = v
+	case *IPv6:
+		i.pseudoheader = v
+	default:
+		return fmt.Errorf("cannot use layer type %v for tcp checksum network layer", l.LayerType())
+	}
+	return nil
+}

vendor/github.com/google/gopacket/layers/test_creator.py

@@ -0,0 +1,103 @@
+#!/usr/bin/python
+# Copyright 2012 Google, Inc. All rights reserved.
+
+"""TestCreator creates test templates from pcap files."""
+
+import argparse
+import base64
+import glob
+import re
+import string
+import subprocess
+import sys
+
+
+class Packet(object):
+  """Helper class encapsulating packet from a pcap file."""
+
+  def __init__(self, packet_lines):
+    self.packet_lines = packet_lines
+    self.data = self._DecodeText(packet_lines)
+
+  @classmethod
+  def _DecodeText(cls, packet_lines):
+    packet_bytes = []
+    # First line is timestamp and stuff, skip it.
+    # Format: 0x0010:  0000 0020 3aff 3ffe 0000 0000 0000 0000  ....:.?.........
+
+    for line in packet_lines[1:]:
+      m = re.match(r'\s+0x[a-f\d]+:\s+((?:[\da-f]{2,4}\s)*)', line, re.IGNORECASE)
+      if m is None: continue
+      for hexpart in m.group(1).split():
+        packet_bytes.append(base64.b16decode(hexpart.upper()))
+    return ''.join(packet_bytes)
+
+  def Test(self, name, link_type):
+    """Yields a test using this packet, as a set of lines."""
+    yield '// testPacket%s is the packet:' % name
+    for line in self.packet_lines:
+      yield '//   ' + line
+    yield 'var testPacket%s = []byte{' % name
+    data = list(self.data)
+    while data:
+      linebytes, data = data[:16], data[16:]
+      yield ''.join(['\t'] + ['0x%02x, ' % ord(c) for c in linebytes])
+    yield '}'
+    yield 'func TestPacket%s(t *testing.T) {' % name
+    yield '\tp := gopacket.NewPacket(testPacket%s, LinkType%s, gopacket.Default)' % (name, link_type)
+    yield '\tif p.ErrorLayer() != nil {'
+    yield '\t\tt.Error("Failed to decode packet:", p.ErrorLayer().Error())'
+    yield '\t}'
+    yield '\tcheckLayers(p, []gopacket.LayerType{LayerType%s, FILL_ME_IN_WITH_ACTUAL_LAYERS}, t)' % link_type
+    yield '}'
+    yield 'func BenchmarkDecodePacket%s(b *testing.B) {' % name
+    yield '\tfor i := 0; i < b.N; i++ {'
+    yield '\t\tgopacket.NewPacket(testPacket%s, LinkType%s, gopacket.NoCopy)' % (name, link_type)
+    yield '\t}'
+    yield '}'
+
+
+
+def GetTcpdumpOutput(filename):
+  """Runs tcpdump on the given file, returning output as string."""
+  return subprocess.check_output(
+      ['tcpdump', '-XX', '-s', '0', '-n', '-r', filename])
+
+
+def TcpdumpOutputToPackets(output):
+  """Reads a pcap file with TCPDump, yielding Packet objects."""
+  pdata = []
+  for line in output.splitlines():
+    if line[0] not in string.whitespace and pdata:
+      yield Packet(pdata)
+      pdata = []
+    pdata.append(line)
+  if pdata:
+    yield Packet(pdata)
+
+
+def main():
+  class CustomHelpFormatter(argparse.ArgumentDefaultsHelpFormatter):
+    def _format_usage(self, usage, actions, groups, prefix=None):
+      header =('TestCreator creates gopacket tests using a pcap file.\n\n'
+               'Tests are written to standard out... they can then be \n'
+               'copied into the file of your choice and modified as \n'
+               'you see.\n\n')
+      return header + argparse.ArgumentDefaultsHelpFormatter._format_usage(
+        self, usage, actions, groups, prefix)
+
+  parser = argparse.ArgumentParser(formatter_class=CustomHelpFormatter)
+  parser.add_argument('--link_type', default='Ethernet', help='the link type (default: %(default)s)')
+  parser.add_argument('--name', default='Packet%d', help='the layer type, must have "%d" inside it')
+  parser.add_argument('files', metavar='file.pcap', type=str, nargs='+', help='the files to process')
+
+  args = parser.parse_args()
+
+  for arg in args.files:
+    for path in glob.glob(arg):
+      for i, packet in enumerate(TcpdumpOutputToPackets(GetTcpdumpOutput(path))):
+        print '\n'.join(packet.Test(
+          args.name % i, args.link_type))
+
+if __name__ == '__main__':
+    main()

vendor/github.com/google/gopacket/layers/tls.go

@@ -0,0 +1,283 @@
+// Copyright 2018 The GoPacket Authors. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+
+package layers
+
+import (
+	"encoding/binary"
+	"errors"
+
+	"github.com/google/gopacket"
+)
+
+// TLSType defines the type of data after the TLS Record
+type TLSType uint8
+
+// TLSType known values.
+const (
+	TLSChangeCipherSpec TLSType = 20
+	TLSAlert            TLSType = 21
+	TLSHandshake        TLSType = 22
+	TLSApplicationData  TLSType = 23
+	TLSUnknown          TLSType = 255
+)
+
+// String shows the register type nicely formatted
+func (tt TLSType) String() string {
+	switch tt {
+	default:
+		return "Unknown"
+	case TLSChangeCipherSpec:
+		return "Change Cipher Spec"
+	case TLSAlert:
+		return "Alert"
+	case TLSHandshake:
+		return "Handshake"
+	case TLSApplicationData:
+		return "Application Data"
+	}
+}
+
+// TLSVersion represents the TLS version in numeric format
+type TLSVersion uint16
+
+// Strings shows the TLS version nicely formatted
+func (tv TLSVersion) String() string {
+	switch tv {
+	default:
+		return "Unknown"
+	case 0x0200:
+		return "SSL 2.0"
+	case 0x0300:
+		return "SSL 3.0"
+	case 0x0301:
+		return "TLS 1.0"
+	case 0x0302:
+		return "TLS 1.1"
+	case 0x0303:
+		return "TLS 1.2"
+	case 0x0304:
+		return "TLS 1.3"
+	}
+}
+
+// TLS is specified in RFC 5246
+//
+//  TLS Record Protocol
+//  0  1  2  3  4  5  6  7  8
+//  +--+--+--+--+--+--+--+--+
+//  |     Content Type      |
+//  +--+--+--+--+--+--+--+--+
+//  |    Version (major)    |
+//  +--+--+--+--+--+--+--+--+
+//  |    Version (minor)    |
+//  +--+--+--+--+--+--+--+--+
+//  |        Length         |
+//  +--+--+--+--+--+--+--+--+
+//  |        Length         |
+//  +--+--+--+--+--+--+--+--+
+
+// TLS is actually a slide of TLSrecord structures
+type TLS struct {
+	BaseLayer
+
+	// TLS Records
+	ChangeCipherSpec []TLSChangeCipherSpecRecord
+	Handshake        []TLSHandshakeRecord
+	AppData          []TLSAppDataRecord
+	Alert            []TLSAlertRecord
+}
+
+// TLSRecordHeader contains all the information that each TLS Record types should have
+type TLSRecordHeader struct {
+	ContentType TLSType
+	Version     TLSVersion
+	Length      uint16
+}
+
+// LayerType returns gopacket.LayerTypeTLS.
+func (t *TLS) LayerType() gopacket.LayerType { return LayerTypeTLS }
+
+// decodeTLS decodes the byte slice into a TLS type. It also
+// setups the application Layer in PacketBuilder.
+func decodeTLS(data []byte, p gopacket.PacketBuilder) error {
+	t := &TLS{}
+	err := t.DecodeFromBytes(data, p)
+	if err != nil {
+		return err
+	}
+	p.AddLayer(t)
+	p.SetApplicationLayer(t)
+	return nil
+}
+
+// DecodeFromBytes decodes the slice into the TLS struct.
+func (t *TLS) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+	t.BaseLayer.Contents = data
+	t.BaseLayer.Payload = nil
+
+	t.ChangeCipherSpec = t.ChangeCipherSpec[:0]
+	t.Handshake = t.Handshake[:0]
+	t.AppData = t.AppData[:0]
+	t.Alert = t.Alert[:0]
+
+	return t.decodeTLSRecords(data, df)
+}
+
+func (t *TLS) decodeTLSRecords(data []byte, df gopacket.DecodeFeedback) error {
+	if len(data) < 5 {
+		df.SetTruncated()
+		return errors.New("TLS record too short")
+	}
+
+	// since there are no further layers, the baselayer's content is
+	// pointing to this layer
+	// TODO: Consider removing this
+	t.BaseLayer = BaseLayer{Contents: data[:len(data)]}
+
+	var h TLSRecordHeader
+	h.ContentType = TLSType(data[0])
+	h.Version = TLSVersion(binary.BigEndian.Uint16(data[1:3]))
+	h.Length = binary.BigEndian.Uint16(data[3:5])
+
+	if h.ContentType.String() == "Unknown" {
+		return errors.New("Unknown TLS record type")
+	}
+
+	hl := 5 // header length
+	tl := hl + int(h.Length)
+	if len(data) < tl {
+		df.SetTruncated()
+		return errors.New("TLS packet length mismatch")
+	}
+
+	switch h.ContentType {
+	default:
+		return errors.New("Unknown TLS record type")
+	case TLSChangeCipherSpec:
+		var r TLSChangeCipherSpecRecord
+		e := r.decodeFromBytes(h, data[hl:tl], df)
+		if e != nil {
+			return e
+		}
+		t.ChangeCipherSpec = append(t.ChangeCipherSpec, r)
+	case TLSAlert:
+		var r TLSAlertRecord
+		e := r.decodeFromBytes(h, data[hl:tl], df)
+		if e != nil {
+			return e
+		}
+		t.Alert = append(t.Alert, r)
+	case TLSHandshake:
+		var r TLSHandshakeRecord
+		e := r.decodeFromBytes(h, data[hl:tl], df)
+		if e != nil {
+			return e
+		}
+		t.Handshake = append(t.Handshake, r)
+	case TLSApplicationData:
+		var r TLSAppDataRecord
+		e := r.decodeFromBytes(h, data[hl:tl], df)
+		if e != nil {
+			return e
+		}
+		t.AppData = append(t.AppData, r)
+	}
+
+	if len(data) == tl {
+		return nil
+	}
+	return t.decodeTLSRecords(data[tl:len(data)], df)
+}
+
+// CanDecode implements gopacket.DecodingLayer.
+func (t *TLS) CanDecode() gopacket.LayerClass {
+	return LayerTypeTLS
+}
+
+// NextLayerType implements gopacket.DecodingLayer.
+func (t *TLS) NextLayerType() gopacket.LayerType {
+	return gopacket.LayerTypeZero
+}
+
+// Payload returns nil, since TLS encrypted payload is inside TLSAppDataRecord
+func (t *TLS) Payload() []byte {
+	return nil
+}
+
+// SerializeTo writes the serialized form of this layer into the
+// SerializationBuffer, implementing gopacket.SerializableLayer.
+func (t *TLS) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	totalLength := 0
+	for _, record := range t.ChangeCipherSpec {
+		if opts.FixLengths {
+			record.Length = 1
+		}
+		totalLength += 5 + 1 // length of header + record
+	}
+	for range t.Handshake {
+		totalLength += 5
+		// TODO
+	}
+	for _, record := range t.AppData {
+		if opts.FixLengths {
+			record.Length = uint16(len(record.Payload))
+		}
+		totalLength += 5 + len(record.Payload)
+	}
+	for _, record := range t.Alert {
+		if len(record.EncryptedMsg) == 0 {
+			if opts.FixLengths {
+				record.Length = 2
+			}
+			totalLength += 5 + 2
+		} else {
+			if opts.FixLengths {
+				record.Length = uint16(len(record.EncryptedMsg))
+			}
+			totalLength += 5 + len(record.EncryptedMsg)
+		}
+	}
+	data, err := b.PrependBytes(totalLength)
+	if err != nil {
+		return err
+	}
+	off := 0
+	for _, record := range t.ChangeCipherSpec {
+		off = encodeHeader(record.TLSRecordHeader, data, off)
+		data[off] = byte(record.Message)
+		off++
+	}
+	for _, record := range t.Handshake {
+		off = encodeHeader(record.TLSRecordHeader, data, off)
+		// TODO
+	}
+	for _, record := range t.AppData {
+		off = encodeHeader(record.TLSRecordHeader, data, off)
+		copy(data[off:], record.Payload)
+		off += len(record.Payload)
+	}
+	for _, record := range t.Alert {
+		off = encodeHeader(record.TLSRecordHeader, data, off)
+		if len(record.EncryptedMsg) == 0 {
+			data[off] = byte(record.Level)
+			data[off+1] = byte(record.Description)
+			off += 2
+		} else {
+			copy(data[off:], record.EncryptedMsg)
+			off += len(record.EncryptedMsg)
+		}
+	}
+	return nil
+}
+
+func encodeHeader(header TLSRecordHeader, data []byte, offset int) int {
+	data[offset] = byte(header.ContentType)
+	binary.BigEndian.PutUint16(data[offset+1:], uint16(header.Version))
+	binary.BigEndian.PutUint16(data[offset+3:], header.Length)
+
+	return offset + 5
+}