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// Copyright 2014, 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"
"net"
"testing"
)
const (
ipv4UDPChecksum = uint16(0xbc5f) // Wireshark
ipv6UDPChecksumWithIPv6DstOpts = uint16(0x4d21) // Wireshark
ipv6UDPChecksumJumbogram = uint16(0xcda8)
)
func createIPv4ChecksumTestLayer() (ip4 *IPv4) {
ip4 = &IPv4{}
ip4.Version = 4
ip4.TTL = 64
ip4.SrcIP = net.ParseIP("192.0.2.1")
ip4.DstIP = net.ParseIP("198.51.100.1")
return
}
func createIPv6ChecksumTestLayer() (ip6 *IPv6) {
ip6 = &IPv6{}
ip6.Version = 6
ip6.NextHeader = IPProtocolNoNextHeader
ip6.HopLimit = 64
ip6.SrcIP = net.ParseIP("2001:db8::1")
ip6.DstIP = net.ParseIP("2001:db8::2")
return
}
func createIPv6DestinationChecksumTestLayer() (dst *IPv6Destination) {
tlv := &IPv6DestinationOption{}
tlv.OptionType = 0x01 //PadN
tlv.OptionData = []byte{0x00, 0x00, 0x00, 0x00}
dst = &IPv6Destination{}
dst.Options = append(dst.Options, tlv)
dst.NextHeader = IPProtocolNoNextHeader
return
}
func createUDPChecksumTestLayer() (udp *UDP) {
udp = &UDP{}
udp.SrcPort = UDPPort(12345)
udp.DstPort = UDPPort(9999)
return
}
func TestIPv4UDPChecksum(t *testing.T) {
var serialize []gopacket.SerializableLayer = make([]gopacket.SerializableLayer, 0, 2)
var u *UDP
var err error
ip4 := createIPv4ChecksumTestLayer()
ip4.Protocol = IPProtocolUDP
serialize = append(serialize, ip4)
udp := createUDPChecksumTestLayer()
udp.SetNetworkLayerForChecksum(ip4)
serialize = append(serialize, udp)
buf := gopacket.NewSerializeBuffer()
opts := gopacket.SerializeOptions{FixLengths: true, ComputeChecksums: true}
err = gopacket.SerializeLayers(buf, opts, serialize...)
if err != nil {
t.Fatal(err)
}
p := gopacket.NewPacket(buf.Bytes(), LinkTypeRaw, gopacket.Default)
if p.ErrorLayer() != nil {
t.Fatal("Failed to decode packet:", p.ErrorLayer().Error())
}
checkLayers(p, []gopacket.LayerType{LayerTypeIPv4, LayerTypeUDP}, t)
if l, ok := p.Layer(LayerTypeUDP).(*UDP); !ok {
t.Fatal("No UDP layer type found in packet")
} else {
u = l
}
got := u.Checksum
want := ipv4UDPChecksum
if got != want {
t.Errorf("Bad checksum:\ngot:\n%#v\n\nwant:\n%#v\n\n", got, want)
}
}
func TestIPv6UDPChecksumWithIPv6DstOpts(t *testing.T) {
var serialize []gopacket.SerializableLayer = make([]gopacket.SerializableLayer, 0, 3)
var u *UDP
var err error
ip6 := createIPv6ChecksumTestLayer()
ip6.NextHeader = IPProtocolIPv6Destination
serialize = append(serialize, ip6)
dst := createIPv6DestinationChecksumTestLayer()
dst.NextHeader = IPProtocolUDP
serialize = append(serialize, dst)
udp := createUDPChecksumTestLayer()
udp.SetNetworkLayerForChecksum(ip6)
serialize = append(serialize, udp)
buf := gopacket.NewSerializeBuffer()
opts := gopacket.SerializeOptions{FixLengths: true, ComputeChecksums: true}
err = gopacket.SerializeLayers(buf, opts, serialize...)
if err != nil {
t.Fatal(err)
}
p := gopacket.NewPacket(buf.Bytes(), LinkTypeRaw, gopacket.Default)
if p.ErrorLayer() != nil {
t.Fatal("Failed to decode packet:", p.ErrorLayer().Error())
}
checkLayers(p, []gopacket.LayerType{LayerTypeIPv6, LayerTypeIPv6Destination, LayerTypeUDP}, t)
if l, ok := p.Layer(LayerTypeUDP).(*UDP); !ok {
t.Fatal("No UDP layer type found in packet")
} else {
u = l
}
got := u.Checksum
want := ipv6UDPChecksumWithIPv6DstOpts
if got != want {
t.Errorf("Bad checksum:\ngot:\n%#v\n\nwant:\n%#v\n\n", got, want)
}
}
func TestIPv6JumbogramUDPChecksum(t *testing.T) {
var serialize []gopacket.SerializableLayer = make([]gopacket.SerializableLayer, 0, 4)
var u *UDP
var err error
ip6 := &IPv6{}
ip6.Version = 6
ip6.NextHeader = IPProtocolUDP
ip6.HopLimit = 64
ip6.SrcIP = net.ParseIP("2001:db8::1")
ip6.DstIP = net.ParseIP("2001:db8::2")
serialize = append(serialize, ip6)
udp := &UDP{}
udp.SrcPort = UDPPort(12345)
udp.DstPort = UDPPort(9999)
udp.SetNetworkLayerForChecksum(ip6)
serialize = append(serialize, udp)
payload := make([]byte, ipv6MaxPayloadLength+1)
for i := range payload {
payload[i] = 0xfe
}
serialize = append(serialize, gopacket.Payload(payload))
buf := gopacket.NewSerializeBuffer()
opts := gopacket.SerializeOptions{FixLengths: true, ComputeChecksums: true}
err = gopacket.SerializeLayers(buf, opts, serialize...)
if err != nil {
t.Fatal(err)
}
p := gopacket.NewPacket(buf.Bytes(), LinkTypeRaw, gopacket.Default)
if p.ErrorLayer() != nil {
t.Fatal("Failed to decode packet:", p.ErrorLayer().Error())
}
checkLayers(p, []gopacket.LayerType{LayerTypeIPv6, LayerTypeIPv6HopByHop, LayerTypeUDP, gopacket.LayerTypePayload}, t)
if l, ok := p.Layer(LayerTypeUDP).(*UDP); !ok {
t.Fatal("No UDP layer type found in packet")
} else {
u = l
}
got := u.Checksum
want := ipv6UDPChecksumJumbogram
if got != want {
t.Errorf("Bad checksum:\ngot:\n%#v\n\nwant:\n%#v\n\n", got, want)
}
}
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