ODPM 266: Go-libmemif + 2 examples.

[govpp.git] / vendor / github.com / google / gopacket / layers / ipsec.go

diff --git a/vendor/github.com/google/gopacket/layers/ipsec.go b/vendor/github.com/google/gopacket/layers/ipsec.go
new file mode 100644 (file)
index 0000000..19163fa
--- /dev/null
+++ b/vendor/github.com/google/gopacket/layers/ipsec.go
@@ -0,0 +1,68 @@
+// 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"
+)
+
+// 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 {
+       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
+       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
+}