blob: 7d84c51463bf15d09ea71a49c870c22be768493f [file] [log] [blame]
Takahiro Suzuki241c10e2020-12-17 20:17:57 +09001// Copyright 2012 Google, Inc. All rights reserved.
2// Copyright 2009-2011 Andreas Krennmair. All rights reserved.
3//
4// Use of this source code is governed by a BSD-style license
5// that can be found in the LICENSE file in the root of the source
6// tree.
7
8package layers
9
10import (
11 "encoding/binary"
12 "github.com/google/gopacket"
13)
14
15// UDPLite is the layer for UDP-Lite headers (rfc 3828).
16type UDPLite struct {
17 BaseLayer
18 SrcPort, DstPort UDPLitePort
19 ChecksumCoverage uint16
20 Checksum uint16
21 sPort, dPort []byte
22}
23
24// LayerType returns gopacket.LayerTypeUDPLite
25func (u *UDPLite) LayerType() gopacket.LayerType { return LayerTypeUDPLite }
26
27func decodeUDPLite(data []byte, p gopacket.PacketBuilder) error {
28 udp := &UDPLite{
29 SrcPort: UDPLitePort(binary.BigEndian.Uint16(data[0:2])),
30 sPort: data[0:2],
31 DstPort: UDPLitePort(binary.BigEndian.Uint16(data[2:4])),
32 dPort: data[2:4],
33 ChecksumCoverage: binary.BigEndian.Uint16(data[4:6]),
34 Checksum: binary.BigEndian.Uint16(data[6:8]),
35 BaseLayer: BaseLayer{data[:8], data[8:]},
36 }
37 p.AddLayer(udp)
38 p.SetTransportLayer(udp)
39 return p.NextDecoder(gopacket.LayerTypePayload)
40}
41
42func (u *UDPLite) TransportFlow() gopacket.Flow {
43 return gopacket.NewFlow(EndpointUDPLitePort, u.sPort, u.dPort)
44}