vendor/github.com/google/gopacket/layers/fddi.go

   1 // Copyright 2012 Google, Inc. All rights reserved.
   2 //
   3 // Use of this source code is governed by a BSD-style license
   4 // that can be found in the LICENSE file in the root of the source
   5 // tree.
   6
   7 package layers
   8
   9 import (
  10         "github.com/google/gopacket"
  11         "net"
  12 )
  13
  14 // FDDI contains the header for FDDI frames.
  15 type FDDI struct {
  16         BaseLayer
  17         FrameControl   FDDIFrameControl
  18         Priority       uint8
  19         SrcMAC, DstMAC net.HardwareAddr
  20 }
  21
  22 // LayerType returns LayerTypeFDDI.
  23 func (f *FDDI) LayerType() gopacket.LayerType { return LayerTypeFDDI }
  24
  25 // LinkFlow returns a new flow of type EndpointMAC.
  26 func (f *FDDI) LinkFlow() gopacket.Flow {
  27         return gopacket.NewFlow(EndpointMAC, f.SrcMAC, f.DstMAC)
  28 }
  29
  30 func decodeFDDI(data []byte, p gopacket.PacketBuilder) error {
  31         f := &FDDI{
  32                 FrameControl: FDDIFrameControl(data[0] & 0xF8),
  33                 Priority:     data[0] & 0x07,
  34                 SrcMAC:       net.HardwareAddr(data[1:7]),
  35                 DstMAC:       net.HardwareAddr(data[7:13]),
  36                 BaseLayer:    BaseLayer{data[:13], data[13:]},
  37         }
  38         p.SetLinkLayer(f)
  39         p.AddLayer(f)
  40         return p.NextDecoder(f.FrameControl)
  41 }