[VOL-1349] EPON OLT adapter (package B)
Change-Id: I634ef62c53813dcf4456f54948f13e06358e263c
diff --git a/vendor/github.com/google/gopacket/layers/ip6.go b/vendor/github.com/google/gopacket/layers/ip6.go
new file mode 100644
index 0000000..70e9c8d
--- /dev/null
+++ b/vendor/github.com/google/gopacket/layers/ip6.go
@@ -0,0 +1,707 @@
+// 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) (h *ipv6HeaderTLVOption) {
+ h = &ipv6HeaderTLVOption{}
+ if data[0] == 0 {
+ h.ActualLength = 1
+ return
+ }
+ h.OptionType = data[0]
+ h.OptionLength = data[1]
+ h.ActualLength = int(h.OptionLength) + 2
+ 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
+ }
+ offset := 2
+ for offset < i.ActualLength {
+ opt := decodeIPv6HeaderTLVOption(data[offset:])
+ 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 := decodeIPv6HeaderTLVOption(data[offset:])
+ 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
+}