diff options
Diffstat (limited to 'vendor/github.com/google/gopacket/layers/mpls.go')
| -rw-r--r-- | vendor/github.com/google/gopacket/layers/mpls.go | 87 |
1 files changed, 0 insertions, 87 deletions
diff --git a/vendor/github.com/google/gopacket/layers/mpls.go b/vendor/github.com/google/gopacket/layers/mpls.go deleted file mode 100644 index 83079a0..0000000 --- a/vendor/github.com/google/gopacket/layers/mpls.go +++ /dev/null @@ -1,87 +0,0 @@ -// 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 -} |