// 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
}