101 lines
2.6 KiB
Go
101 lines
2.6 KiB
Go
package ingress
|
|
|
|
import (
|
|
"context"
|
|
"fmt"
|
|
"net/netip"
|
|
"time"
|
|
|
|
"github.com/rs/zerolog"
|
|
"golang.org/x/net/icmp"
|
|
"golang.org/x/net/ipv4"
|
|
"golang.org/x/net/ipv6"
|
|
|
|
"github.com/cloudflare/cloudflared/packet"
|
|
)
|
|
|
|
const (
|
|
// funnelIdleTimeout controls how long to wait to close a funnel without send/return
|
|
funnelIdleTimeout = time.Second * 10
|
|
mtu = 1500
|
|
// icmpRequestTimeoutMs controls how long to wait for a reply
|
|
icmpRequestTimeoutMs = 1000
|
|
)
|
|
|
|
var (
|
|
errPacketNil = fmt.Errorf("packet is nil")
|
|
)
|
|
|
|
type icmpRouter struct {
|
|
ipv4Proxy *icmpProxy
|
|
ipv6Proxy *icmpProxy
|
|
}
|
|
|
|
// NewICMPRouter doesn't return an error if either ipv4 proxy or ipv6 proxy can be created. The machine might only
|
|
// support one of them
|
|
func NewICMPRouter(logger *zerolog.Logger) (*icmpRouter, error) {
|
|
// TODO: TUN-6741: don't bind to all interface
|
|
ipv4Proxy, ipv4Err := newICMPProxy(netip.IPv4Unspecified(), logger, funnelIdleTimeout)
|
|
ipv6Proxy, ipv6Err := newICMPProxy(netip.IPv6Unspecified(), logger, funnelIdleTimeout)
|
|
if ipv4Err != nil && ipv6Err != nil {
|
|
return nil, fmt.Errorf("cannot create ICMPv4 proxy: %v nor ICMPv6 proxy: %v", ipv4Err, ipv6Err)
|
|
}
|
|
if ipv4Err != nil {
|
|
logger.Debug().Err(ipv4Err).Msg("failed to create ICMPv4 proxy, only ICMPv6 proxy is created")
|
|
ipv4Proxy = nil
|
|
}
|
|
if ipv6Err != nil {
|
|
logger.Debug().Err(ipv6Err).Msg("failed to create ICMPv6 proxy, only ICMPv4 proxy is created")
|
|
ipv6Proxy = nil
|
|
}
|
|
return &icmpRouter{
|
|
ipv4Proxy: ipv4Proxy,
|
|
ipv6Proxy: ipv6Proxy,
|
|
}, nil
|
|
}
|
|
|
|
func (ir *icmpRouter) Serve(ctx context.Context) error {
|
|
if ir.ipv4Proxy != nil && ir.ipv6Proxy != nil {
|
|
errC := make(chan error, 2)
|
|
go func() {
|
|
errC <- ir.ipv4Proxy.Serve(ctx)
|
|
}()
|
|
go func() {
|
|
errC <- ir.ipv6Proxy.Serve(ctx)
|
|
}()
|
|
return <-errC
|
|
}
|
|
if ir.ipv4Proxy != nil {
|
|
return ir.ipv4Proxy.Serve(ctx)
|
|
}
|
|
if ir.ipv6Proxy != nil {
|
|
return ir.ipv6Proxy.Serve(ctx)
|
|
}
|
|
return fmt.Errorf("ICMPv4 proxy and ICMPv6 proxy are both nil")
|
|
}
|
|
|
|
func (ir *icmpRouter) Request(pk *packet.ICMP, responder packet.FunnelUniPipe) error {
|
|
if pk.Dst.Is4() {
|
|
if ir.ipv4Proxy != nil {
|
|
return ir.ipv4Proxy.Request(pk, responder)
|
|
}
|
|
return fmt.Errorf("ICMPv4 proxy was not instantiated")
|
|
}
|
|
if ir.ipv6Proxy != nil {
|
|
return ir.ipv6Proxy.Request(pk, responder)
|
|
}
|
|
return fmt.Errorf("ICMPv6 proxy was not instantiated")
|
|
}
|
|
|
|
func getICMPEcho(msg *icmp.Message) (*icmp.Echo, error) {
|
|
echo, ok := msg.Body.(*icmp.Echo)
|
|
if !ok {
|
|
return nil, fmt.Errorf("expect ICMP echo, got %s", msg.Type)
|
|
}
|
|
return echo, nil
|
|
}
|
|
|
|
func isEchoReply(msg *icmp.Message) bool {
|
|
return msg.Type == ipv4.ICMPTypeEchoReply || msg.Type == ipv6.ICMPTypeEchoReply
|
|
}
|