diff options
Diffstat (limited to 'vendor/github.com/google/gopacket/layers/linux_sll.go')
-rw-r--r-- | vendor/github.com/google/gopacket/layers/linux_sll.go | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/vendor/github.com/google/gopacket/layers/linux_sll.go b/vendor/github.com/google/gopacket/layers/linux_sll.go new file mode 100644 index 0000000..b186053 --- /dev/null +++ b/vendor/github.com/google/gopacket/layers/linux_sll.go @@ -0,0 +1,96 @@ +// 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" + "fmt" + "net" + + "github.com/google/gopacket" +) + +type LinuxSLLPacketType uint16 + +const ( + LinuxSLLPacketTypeHost LinuxSLLPacketType = 0 // To us + LinuxSLLPacketTypeBroadcast LinuxSLLPacketType = 1 // To all + LinuxSLLPacketTypeMulticast LinuxSLLPacketType = 2 // To group + LinuxSLLPacketTypeOtherhost LinuxSLLPacketType = 3 // To someone else + LinuxSLLPacketTypeOutgoing LinuxSLLPacketType = 4 // Outgoing of any type + // These ones are invisible by user level + LinuxSLLPacketTypeLoopback LinuxSLLPacketType = 5 // MC/BRD frame looped back + LinuxSLLPacketTypeFastroute LinuxSLLPacketType = 6 // Fastrouted frame +) + +func (l LinuxSLLPacketType) String() string { + switch l { + case LinuxSLLPacketTypeHost: + return "host" + case LinuxSLLPacketTypeBroadcast: + return "broadcast" + case LinuxSLLPacketTypeMulticast: + return "multicast" + case LinuxSLLPacketTypeOtherhost: + return "otherhost" + case LinuxSLLPacketTypeOutgoing: + return "outgoing" + case LinuxSLLPacketTypeLoopback: + return "loopback" + case LinuxSLLPacketTypeFastroute: + return "fastroute" + } + return fmt.Sprintf("Unknown(%d)", int(l)) +} + +type LinuxSLL struct { + BaseLayer + PacketType LinuxSLLPacketType + AddrLen uint16 + Addr net.HardwareAddr + EthernetType EthernetType +} + +// LayerType returns LayerTypeLinuxSLL. +func (sll *LinuxSLL) LayerType() gopacket.LayerType { return LayerTypeLinuxSLL } + +func (sll *LinuxSLL) CanDecode() gopacket.LayerClass { + return LayerTypeLinuxSLL +} + +func (sll *LinuxSLL) LinkFlow() gopacket.Flow { + return gopacket.NewFlow(EndpointMAC, sll.Addr, nil) +} + +func (sll *LinuxSLL) NextLayerType() gopacket.LayerType { + return sll.EthernetType.LayerType() +} + +func (sll *LinuxSLL) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error { + if len(data) < 16 { + return errors.New("Linux SLL packet too small") + } + sll.PacketType = LinuxSLLPacketType(binary.BigEndian.Uint16(data[0:2])) + sll.AddrLen = binary.BigEndian.Uint16(data[4:6]) + + sll.Addr = net.HardwareAddr(data[6 : sll.AddrLen+6]) + sll.EthernetType = EthernetType(binary.BigEndian.Uint16(data[14:16])) + sll.BaseLayer = BaseLayer{data[:16], data[16:]} + + return nil +} + +func decodeLinuxSLL(data []byte, p gopacket.PacketBuilder) error { + sll := &LinuxSLL{} + if err := sll.DecodeFromBytes(data, p); err != nil { + return err + } + p.AddLayer(sll) + p.SetLinkLayer(sll) + return p.NextDecoder(sll.EthernetType) +} |