TUN-6666: Define packet package

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

vendor/github.com/google/gopacket/layers_decoder.go

@@ -0,0 +1,101 @@
+// Copyright 2019 The GoPacket Authors. All rights reserved.
+
+package gopacket
+
+// Created by gen.go, don't edit manually
+// Generated at 2019-06-18 11:37:31.308731293 +0600 +06 m=+0.000842599
+
+// LayersDecoder returns DecodingLayerFunc for specified
+// DecodingLayerContainer, LayerType value to start decoding with and
+// some DecodeFeedback.
+func LayersDecoder(dl DecodingLayerContainer, first LayerType, df DecodeFeedback) DecodingLayerFunc {
+	firstDec, ok := dl.Decoder(first)
+	if !ok {
+		return func([]byte, *[]LayerType) (LayerType, error) {
+			return first, nil
+		}
+	}
+	if dlc, ok := dl.(DecodingLayerSparse); ok {
+		return func(data []byte, decoded *[]LayerType) (LayerType, error) {
+			*decoded = (*decoded)[:0] // Truncated decoded layers.
+			typ := first
+			decoder := firstDec
+			for {
+				if err := decoder.DecodeFromBytes(data, df); err != nil {
+					return LayerTypeZero, err
+				}
+				*decoded = append(*decoded, typ)
+				typ = decoder.NextLayerType()
+				if data = decoder.LayerPayload(); len(data) == 0 {
+					break
+				}
+				if decoder, ok = dlc.Decoder(typ); !ok {
+					return typ, nil
+				}
+			}
+			return LayerTypeZero, nil
+		}
+	}
+	if dlc, ok := dl.(DecodingLayerArray); ok {
+		return func(data []byte, decoded *[]LayerType) (LayerType, error) {
+			*decoded = (*decoded)[:0] // Truncated decoded layers.
+			typ := first
+			decoder := firstDec
+			for {
+				if err := decoder.DecodeFromBytes(data, df); err != nil {
+					return LayerTypeZero, err
+				}
+				*decoded = append(*decoded, typ)
+				typ = decoder.NextLayerType()
+				if data = decoder.LayerPayload(); len(data) == 0 {
+					break
+				}
+				if decoder, ok = dlc.Decoder(typ); !ok {
+					return typ, nil
+				}
+			}
+			return LayerTypeZero, nil
+		}
+	}
+	if dlc, ok := dl.(DecodingLayerMap); ok {
+		return func(data []byte, decoded *[]LayerType) (LayerType, error) {
+			*decoded = (*decoded)[:0] // Truncated decoded layers.
+			typ := first
+			decoder := firstDec
+			for {
+				if err := decoder.DecodeFromBytes(data, df); err != nil {
+					return LayerTypeZero, err
+				}
+				*decoded = append(*decoded, typ)
+				typ = decoder.NextLayerType()
+				if data = decoder.LayerPayload(); len(data) == 0 {
+					break
+				}
+				if decoder, ok = dlc.Decoder(typ); !ok {
+					return typ, nil
+				}
+			}
+			return LayerTypeZero, nil
+		}
+	}
+	dlc := dl
+	return func(data []byte, decoded *[]LayerType) (LayerType, error) {
+		*decoded = (*decoded)[:0] // Truncated decoded layers.
+		typ := first
+		decoder := firstDec
+		for {
+			if err := decoder.DecodeFromBytes(data, df); err != nil {
+				return LayerTypeZero, err
+			}
+			*decoded = append(*decoded, typ)
+			typ = decoder.NextLayerType()
+			if data = decoder.LayerPayload(); len(data) == 0 {
+				break
+			}
+			if decoder, ok = dlc.Decoder(typ); !ok {
+				return typ, nil
+			}
+		}
+		return LayerTypeZero, nil
+	}
+}