TUN-6666: Define packet package

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

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

@@ -0,0 +1,97 @@
+// 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"
+	"net"
+	"strconv"
+)
+
+var (
+	// We use two different endpoint types for IPv4 vs IPv6 addresses, so that
+	// ordering with endpointA.LessThan(endpointB) sanely groups all IPv4
+	// addresses and all IPv6 addresses, such that IPv6 > IPv4 for all addresses.
+	EndpointIPv4 = gopacket.RegisterEndpointType(1, gopacket.EndpointTypeMetadata{Name: "IPv4", Formatter: func(b []byte) string {
+		return net.IP(b).String()
+	}})
+	EndpointIPv6 = gopacket.RegisterEndpointType(2, gopacket.EndpointTypeMetadata{Name: "IPv6", Formatter: func(b []byte) string {
+		return net.IP(b).String()
+	}})
+
+	EndpointMAC = gopacket.RegisterEndpointType(3, gopacket.EndpointTypeMetadata{Name: "MAC", Formatter: func(b []byte) string {
+		return net.HardwareAddr(b).String()
+	}})
+	EndpointTCPPort = gopacket.RegisterEndpointType(4, gopacket.EndpointTypeMetadata{Name: "TCP", Formatter: func(b []byte) string {
+		return strconv.Itoa(int(binary.BigEndian.Uint16(b)))
+	}})
+	EndpointUDPPort = gopacket.RegisterEndpointType(5, gopacket.EndpointTypeMetadata{Name: "UDP", Formatter: func(b []byte) string {
+		return strconv.Itoa(int(binary.BigEndian.Uint16(b)))
+	}})
+	EndpointSCTPPort = gopacket.RegisterEndpointType(6, gopacket.EndpointTypeMetadata{Name: "SCTP", Formatter: func(b []byte) string {
+		return strconv.Itoa(int(binary.BigEndian.Uint16(b)))
+	}})
+	EndpointRUDPPort = gopacket.RegisterEndpointType(7, gopacket.EndpointTypeMetadata{Name: "RUDP", Formatter: func(b []byte) string {
+		return strconv.Itoa(int(b[0]))
+	}})
+	EndpointUDPLitePort = gopacket.RegisterEndpointType(8, gopacket.EndpointTypeMetadata{Name: "UDPLite", Formatter: func(b []byte) string {
+		return strconv.Itoa(int(binary.BigEndian.Uint16(b)))
+	}})
+	EndpointPPP = gopacket.RegisterEndpointType(9, gopacket.EndpointTypeMetadata{Name: "PPP", Formatter: func([]byte) string {
+		return "point"
+	}})
+)
+
+// NewIPEndpoint creates a new IP (v4 or v6) endpoint from a net.IP address.
+// It returns gopacket.InvalidEndpoint if the IP address is invalid.
+func NewIPEndpoint(a net.IP) gopacket.Endpoint {
+	ipv4 := a.To4()
+	if ipv4 != nil {
+		return gopacket.NewEndpoint(EndpointIPv4, []byte(ipv4))
+	}
+
+	ipv6 := a.To16()
+	if ipv6 != nil {
+		return gopacket.NewEndpoint(EndpointIPv6, []byte(ipv6))
+	}
+
+	return gopacket.InvalidEndpoint
+}
+
+// NewMACEndpoint returns a new MAC address endpoint.
+func NewMACEndpoint(a net.HardwareAddr) gopacket.Endpoint {
+	return gopacket.NewEndpoint(EndpointMAC, []byte(a))
+}
+func newPortEndpoint(t gopacket.EndpointType, p uint16) gopacket.Endpoint {
+	return gopacket.NewEndpoint(t, []byte{byte(p >> 8), byte(p)})
+}
+
+// NewTCPPortEndpoint returns an endpoint based on a TCP port.
+func NewTCPPortEndpoint(p TCPPort) gopacket.Endpoint {
+	return newPortEndpoint(EndpointTCPPort, uint16(p))
+}
+
+// NewUDPPortEndpoint returns an endpoint based on a UDP port.
+func NewUDPPortEndpoint(p UDPPort) gopacket.Endpoint {
+	return newPortEndpoint(EndpointUDPPort, uint16(p))
+}
+
+// NewSCTPPortEndpoint returns an endpoint based on a SCTP port.
+func NewSCTPPortEndpoint(p SCTPPort) gopacket.Endpoint {
+	return newPortEndpoint(EndpointSCTPPort, uint16(p))
+}
+
+// NewRUDPPortEndpoint returns an endpoint based on a RUDP port.
+func NewRUDPPortEndpoint(p RUDPPort) gopacket.Endpoint {
+	return gopacket.NewEndpoint(EndpointRUDPPort, []byte{byte(p)})
+}
+
+// NewUDPLitePortEndpoint returns an endpoint based on a UDPLite port.
+func NewUDPLitePortEndpoint(p UDPLitePort) gopacket.Endpoint {
+	return newPortEndpoint(EndpointUDPLitePort, uint16(p))
+}