TUN-6666: Define packet package

This package defines IP and ICMP packet, decoders, encoder and flow

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

@@ -0,0 +1,44 @@
+// Copyright 2012 Google, Inc. All rights reserved.
+// Copyright 2009-2011 Andreas Krennmair. 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"
+)
+
+// UDPLite is the layer for UDP-Lite headers (rfc 3828).
+type UDPLite struct {
+	BaseLayer
+	SrcPort, DstPort UDPLitePort
+	ChecksumCoverage uint16
+	Checksum         uint16
+	sPort, dPort     []byte
+}
+
+// LayerType returns gopacket.LayerTypeUDPLite
+func (u *UDPLite) LayerType() gopacket.LayerType { return LayerTypeUDPLite }
+
+func decodeUDPLite(data []byte, p gopacket.PacketBuilder) error {
+	udp := &UDPLite{
+		SrcPort:          UDPLitePort(binary.BigEndian.Uint16(data[0:2])),
+		sPort:            data[0:2],
+		DstPort:          UDPLitePort(binary.BigEndian.Uint16(data[2:4])),
+		dPort:            data[2:4],
+		ChecksumCoverage: binary.BigEndian.Uint16(data[4:6]),
+		Checksum:         binary.BigEndian.Uint16(data[6:8]),
+		BaseLayer:        BaseLayer{data[:8], data[8:]},
+	}
+	p.AddLayer(udp)
+	p.SetTransportLayer(udp)
+	return p.NextDecoder(gopacket.LayerTypePayload)
+}
+
+func (u *UDPLite) TransportFlow() gopacket.Flow {
+	return gopacket.NewFlow(EndpointUDPLitePort, u.sPort, u.dPort)
+}