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45 lines
1.3 KiB
45 lines
1.3 KiB
// Copyright 2012 Google, Inc. All rights reserved.
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// Copyright 2009-2011 Andreas Krennmair. All rights reserved.
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//
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// Use of this source code is governed by a BSD-style license
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// that can be found in the LICENSE file in the root of the source
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// tree.
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package layers
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import (
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"encoding/binary"
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"github.com/google/gopacket"
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)
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// UDPLite is the layer for UDP-Lite headers (rfc 3828).
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type UDPLite struct {
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BaseLayer
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SrcPort, DstPort UDPLitePort
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ChecksumCoverage uint16
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Checksum uint16
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sPort, dPort []byte
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}
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// LayerType returns gopacket.LayerTypeUDPLite
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func (u *UDPLite) LayerType() gopacket.LayerType { return LayerTypeUDPLite }
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func decodeUDPLite(data []byte, p gopacket.PacketBuilder) error {
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udp := &UDPLite{
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SrcPort: UDPLitePort(binary.BigEndian.Uint16(data[0:2])),
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sPort: data[0:2],
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DstPort: UDPLitePort(binary.BigEndian.Uint16(data[2:4])),
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dPort: data[2:4],
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ChecksumCoverage: binary.BigEndian.Uint16(data[4:6]),
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Checksum: binary.BigEndian.Uint16(data[6:8]),
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BaseLayer: BaseLayer{data[:8], data[8:]},
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}
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p.AddLayer(udp)
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p.SetTransportLayer(udp)
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return p.NextDecoder(gopacket.LayerTypePayload)
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}
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func (u *UDPLite) TransportFlow() gopacket.Flow {
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return gopacket.NewFlow(EndpointUDPLitePort, u.sPort, u.dPort)
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}
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