mirror of https://github.com/subgraph/fw-daemon
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
69 lines
1.9 KiB
69 lines
1.9 KiB
// 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
|
|
}
|