TUN-6666: Define packet package

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

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

@@ -0,0 +1,45 @@
+// 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"
+	"github.com/google/gopacket"
+)
+
+// EtherIP is the struct for storing RFC 3378 EtherIP packet headers.
+type EtherIP struct {
+	BaseLayer
+	Version  uint8
+	Reserved uint16
+}
+
+// LayerType returns gopacket.LayerTypeEtherIP.
+func (e *EtherIP) LayerType() gopacket.LayerType { return LayerTypeEtherIP }
+
+// DecodeFromBytes decodes the given bytes into this layer.
+func (e *EtherIP) DecodeFromBytes(data []byte, df gopacket.DecodeFeedback) error {
+	e.Version = data[0] >> 4
+	e.Reserved = binary.BigEndian.Uint16(data[:2]) & 0x0fff
+	e.BaseLayer = BaseLayer{data[:2], data[2:]}
+	return nil
+}
+
+// CanDecode returns the set of layer types that this DecodingLayer can decode.
+func (e *EtherIP) CanDecode() gopacket.LayerClass {
+	return LayerTypeEtherIP
+}
+
+// NextLayerType returns the layer type contained by this DecodingLayer.
+func (e *EtherIP) NextLayerType() gopacket.LayerType {
+	return LayerTypeEthernet
+}
+
+func decodeEtherIP(data []byte, p gopacket.PacketBuilder) error {
+	e := &EtherIP{}
+	return decodingLayerDecoder(e, data, p)
+}