TUN-6666: Define packet package

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

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

@@ -0,0 +1,27 @@
+// Copyright 2017 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 (
+	"github.com/google/gopacket"
+)
+
+// STP decode spanning tree protocol packets to transport BPDU (bridge protocol data unit) message.
+type STP struct {
+	BaseLayer
+}
+
+// LayerType returns gopacket.LayerTypeSTP.
+func (s *STP) LayerType() gopacket.LayerType { return LayerTypeSTP }
+
+func decodeSTP(data []byte, p gopacket.PacketBuilder) error {
+	stp := &STP{}
+	stp.Contents = data[:]
+	// TODO:  parse the STP protocol into actual subfields.
+	p.AddLayer(stp)
+	return nil
+}