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// Copyright 2018 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package ipv6
import (
"strings"
"testing"
"time"
"gvisor.googlesource.com/gvisor/pkg/tcpip"
"gvisor.googlesource.com/gvisor/pkg/tcpip/buffer"
"gvisor.googlesource.com/gvisor/pkg/tcpip/header"
"gvisor.googlesource.com/gvisor/pkg/tcpip/link/channel"
"gvisor.googlesource.com/gvisor/pkg/tcpip/link/sniffer"
"gvisor.googlesource.com/gvisor/pkg/tcpip/stack"
"gvisor.googlesource.com/gvisor/pkg/tcpip/transport/icmp"
"gvisor.googlesource.com/gvisor/pkg/waiter"
)
const (
linkAddr0 = tcpip.LinkAddress("\x01\x02\x03\x04\x05\x06")
linkAddr1 = tcpip.LinkAddress("\x0a\x0b\x0c\x0d\x0e\x0f")
)
var (
lladdr0 = header.LinkLocalAddr(linkAddr0)
lladdr1 = header.LinkLocalAddr(linkAddr1)
)
type icmpInfo struct {
typ header.ICMPv6Type
src tcpip.Address
}
type testContext struct {
t *testing.T
s0 *stack.Stack
s1 *stack.Stack
linkEP0 *channel.Endpoint
linkEP1 *channel.Endpoint
icmpCh chan icmpInfo
}
type endpointWithResolutionCapability struct {
stack.LinkEndpoint
}
func (e endpointWithResolutionCapability) Capabilities() stack.LinkEndpointCapabilities {
return e.LinkEndpoint.Capabilities() | stack.CapabilityResolutionRequired
}
func newTestContext(t *testing.T) *testContext {
c := &testContext{
t: t,
s0: stack.New([]string{ProtocolName}, []string{icmp.ProtocolName6}, stack.Options{}),
s1: stack.New([]string{ProtocolName}, []string{icmp.ProtocolName6}, stack.Options{}),
icmpCh: make(chan icmpInfo, 10),
}
const defaultMTU = 65536
_, linkEP0 := channel.New(256, defaultMTU, linkAddr0)
c.linkEP0 = linkEP0
wrappedEP0 := endpointWithResolutionCapability{LinkEndpoint: linkEP0}
id0 := stack.RegisterLinkEndpoint(wrappedEP0)
if testing.Verbose() {
id0 = sniffer.New(id0)
}
if err := c.s0.CreateNIC(1, id0); err != nil {
t.Fatalf("CreateNIC s0: %v", err)
}
if err := c.s0.AddAddress(1, ProtocolNumber, lladdr0); err != nil {
t.Fatalf("AddAddress lladdr0: %v", err)
}
if err := c.s0.AddAddress(1, ProtocolNumber, header.SolicitedNodeAddr(lladdr0)); err != nil {
t.Fatalf("AddAddress sn lladdr0: %v", err)
}
_, linkEP1 := channel.New(256, defaultMTU, linkAddr1)
c.linkEP1 = linkEP1
wrappedEP1 := endpointWithResolutionCapability{LinkEndpoint: linkEP1}
id1 := stack.RegisterLinkEndpoint(wrappedEP1)
if err := c.s1.CreateNIC(1, id1); err != nil {
t.Fatalf("CreateNIC failed: %v", err)
}
if err := c.s1.AddAddress(1, ProtocolNumber, lladdr1); err != nil {
t.Fatalf("AddAddress lladdr1: %v", err)
}
if err := c.s1.AddAddress(1, ProtocolNumber, header.SolicitedNodeAddr(lladdr1)); err != nil {
t.Fatalf("AddAddress sn lladdr1: %v", err)
}
c.s0.SetRouteTable(
[]tcpip.Route{{
Destination: lladdr1,
Mask: tcpip.AddressMask(strings.Repeat("\xff", 16)),
NIC: 1,
}},
)
c.s1.SetRouteTable(
[]tcpip.Route{{
Destination: lladdr0,
Mask: tcpip.AddressMask(strings.Repeat("\xff", 16)),
NIC: 1,
}},
)
go c.routePackets(linkEP0.C, linkEP1)
go c.routePackets(linkEP1.C, linkEP0)
return c
}
func (c *testContext) countPacket(pkt channel.PacketInfo) {
if pkt.Proto != ProtocolNumber {
return
}
ipv6 := header.IPv6(pkt.Header)
transProto := tcpip.TransportProtocolNumber(ipv6.NextHeader())
if transProto != header.ICMPv6ProtocolNumber {
return
}
b := pkt.Header[header.IPv6MinimumSize:]
icmp := header.ICMPv6(b)
c.icmpCh <- icmpInfo{
typ: icmp.Type(),
src: ipv6.SourceAddress(),
}
}
func (c *testContext) routePackets(ch <-chan channel.PacketInfo, ep *channel.Endpoint) {
for pkt := range ch {
c.countPacket(pkt)
views := []buffer.View{pkt.Header, pkt.Payload}
size := len(pkt.Header) + len(pkt.Payload)
vv := buffer.NewVectorisedView(size, views)
ep.InjectLinkAddr(pkt.Proto, ep.LinkAddress(), vv)
}
}
func (c *testContext) cleanup() {
close(c.linkEP0.C)
close(c.linkEP1.C)
}
func TestLinkResolution(t *testing.T) {
c := newTestContext(t)
defer c.cleanup()
r, err := c.s0.FindRoute(1, lladdr0, lladdr1, ProtocolNumber, false /* multicastLoop */)
if err != nil {
t.Fatal(err)
}
defer r.Release()
hdr := buffer.NewPrependable(int(r.MaxHeaderLength()) + header.IPv6MinimumSize + header.ICMPv6EchoMinimumSize)
pkt := header.ICMPv6(hdr.Prepend(header.ICMPv6EchoMinimumSize))
pkt.SetType(header.ICMPv6EchoRequest)
pkt.SetChecksum(icmpChecksum(pkt, r.LocalAddress, r.RemoteAddress, buffer.VectorisedView{}))
payload := tcpip.SlicePayload(hdr.View())
// We can't send our payload directly over the route because that
// doesn't provoke NDP discovery.
var wq waiter.Queue
ep, err := c.s0.NewEndpoint(header.ICMPv6ProtocolNumber, ProtocolNumber, &wq)
if err != nil {
t.Fatal(err)
}
for {
_, resCh, err := ep.Write(payload, tcpip.WriteOptions{To: &tcpip.FullAddress{NIC: 1, Addr: lladdr1}})
if resCh != nil {
if err != tcpip.ErrNoLinkAddress {
t.Fatalf("ep.Write(_) = _, <non-nil>, %s want _, <non-nil>, tcpip.ErrNoLinkAddress", err)
}
<-resCh
continue
}
if err != nil {
t.Fatalf("ep.Write(_) = _, _, %s", err)
}
break
}
stats := make(map[header.ICMPv6Type]int)
for {
// This actually takes about 10 milliseconds, so no need to wait for
// a multi-minute go test timeout if something is broken.
select {
case <-time.After(2 * time.Second):
t.Errorf("timeout waiting for ICMP, got: %#+v", stats)
return
case icmpInfo := <-c.icmpCh:
switch icmpInfo.typ {
case header.ICMPv6NeighborAdvert:
if got, want := icmpInfo.src, lladdr1; got != want {
t.Errorf("got ICMPv6NeighborAdvert.sourceAddress = %v, want = %v", got, want)
}
}
stats[icmpInfo.typ]++
if stats[header.ICMPv6NeighborSolicit] > 0 &&
stats[header.ICMPv6NeighborAdvert] > 0 &&
stats[header.ICMPv6EchoRequest] > 0 &&
stats[header.ICMPv6EchoReply] > 0 {
return
}
}
}
}
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