| // Copyright 2016 The Netstack Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| package ipv6 |
| |
| import ( |
| "context" |
| "strings" |
| "testing" |
| "time" |
| |
| "github.com/google/netstack/tcpip" |
| "github.com/google/netstack/tcpip/buffer" |
| "github.com/google/netstack/tcpip/header" |
| "github.com/google/netstack/tcpip/link/channel" |
| "github.com/google/netstack/tcpip/link/sniffer" |
| "github.com/google/netstack/tcpip/stack" |
| ) |
| |
| const ( |
| linkAddr0 = tcpip.LinkAddress("\x01\x02\x03\x04\x05\x06") |
| linkAddr1 = tcpip.LinkAddress("\x0a\x0b\x0c\x0d\x0e\x0f") |
| ) |
| |
| var ( |
| lladdr0 = LinkLocalAddr(linkAddr0) |
| lladdr1 = LinkLocalAddr(linkAddr1) |
| ) |
| |
| type testContext struct { |
| t *testing.T |
| s0 *stack.Stack |
| s1 *stack.Stack |
| |
| linkEP0 *channel.Endpoint |
| linkEP1 *channel.Endpoint |
| |
| icmpCh chan header.ICMPv6Type |
| } |
| |
| func newTestContext(t *testing.T) *testContext { |
| c := &testContext{ |
| t: t, |
| s0: stack.New([]string{ProtocolName}, nil), |
| s1: stack.New([]string{ProtocolName}, nil), |
| icmpCh: make(chan header.ICMPv6Type, 10), |
| } |
| |
| const defaultMTU = 65536 |
| id0, linkEP0 := channel.New(256, defaultMTU, linkAddr0) |
| c.linkEP0 = linkEP0 |
| 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, SolicitedNodeAddr(lladdr0)); err != nil { |
| t.Fatalf("AddAddress sn lladdr0: %v", err) |
| } |
| |
| id1, linkEP1 := channel.New(256, defaultMTU, linkAddr1) |
| c.linkEP1 = linkEP1 |
| 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, SolicitedNodeAddr(lladdr1)); err != nil { |
| t.Fatalf("AddAddress sn lladdr1: %v", err) |
| } |
| |
| routeTable := []tcpip.Route{{ |
| Destination: tcpip.Address(strings.Repeat("\x00", 16)), |
| Mask: tcpip.Address(strings.Repeat("\x00", 16)), |
| NIC: 1, |
| }} |
| c.s0.SetRouteTable(routeTable) |
| c.s1.SetRouteTable(routeTable) |
| |
| go c.routePackets(linkEP0.C, linkEP1) |
| go c.routePackets(linkEP1.C, linkEP0) |
| |
| return c |
| } |
| |
| func (c *testContext) countPacket(pkt channel.PacketInfo) { |
| if pkt.Proto != header.IPv6ProtocolNumber { |
| 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 <- icmp.Type() |
| } |
| |
| 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, header.IPv6ProtocolNumber) |
| 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, nil)) |
| if err := r.WritePacket(&hdr, nil, header.ICMPv6ProtocolNumber, header.IPv6DefaultHopLimit); err != nil { |
| t.Fatal(err) |
| } |
| |
| // This actually takes about 10 milliseconds, so no need to wait for |
| // a multi-minute go test timeout if something is broken. |
| ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second) |
| defer cancel() |
| |
| stats := make(map[header.ICMPv6Type]int) |
| for { |
| select { |
| case <-ctx.Done(): |
| t.Errorf("timeout waiting for ICMP, got: %#+v", stats) |
| return |
| case typ := <-c.icmpCh: |
| stats[typ]++ |
| |
| if stats[header.ICMPv6NeighborSolicit] > 0 && |
| stats[header.ICMPv6NeighborAdvert] > 0 && |
| stats[header.ICMPv6EchoRequest] > 0 && |
| stats[header.ICMPv6EchoReply] > 0 { |
| return |
| } |
| } |
| } |
| } |