2019-09-17 21:45:41 +00:00
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// Copyright 2019 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package ipv6
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import (
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"testing"
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"gvisor.dev/gvisor/pkg/tcpip"
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"gvisor.dev/gvisor/pkg/tcpip/buffer"
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"gvisor.dev/gvisor/pkg/tcpip/header"
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"gvisor.dev/gvisor/pkg/tcpip/link/channel"
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"gvisor.dev/gvisor/pkg/tcpip/stack"
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"gvisor.dev/gvisor/pkg/tcpip/transport/icmp"
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"gvisor.dev/gvisor/pkg/tcpip/transport/udp"
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"gvisor.dev/gvisor/pkg/waiter"
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)
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const (
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addr1 = "\x0a\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01"
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addr2 = "\x0a\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02"
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// The least significant 3 bytes are the same as addr2 so both addr2 and
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// addr3 will have the same solicited-node address.
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addr3 = "\x0a\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x02"
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)
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// testReceiveICMP tests receiving an ICMP packet from src to dst. want is the
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// expected Neighbor Advertisement received count after receiving the packet.
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func testReceiveICMP(t *testing.T, s *stack.Stack, e *channel.Endpoint, src, dst tcpip.Address, want uint64) {
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t.Helper()
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// Receive ICMP packet.
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hdr := buffer.NewPrependable(header.IPv6MinimumSize + header.ICMPv6NeighborAdvertSize)
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pkt := header.ICMPv6(hdr.Prepend(header.ICMPv6NeighborAdvertSize))
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pkt.SetType(header.ICMPv6NeighborAdvert)
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pkt.SetChecksum(header.ICMPv6Checksum(pkt, src, dst, buffer.VectorisedView{}))
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payloadLength := hdr.UsedLength()
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ip := header.IPv6(hdr.Prepend(header.IPv6MinimumSize))
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ip.Encode(&header.IPv6Fields{
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PayloadLength: uint16(payloadLength),
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NextHeader: uint8(header.ICMPv6ProtocolNumber),
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HopLimit: 255,
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SrcAddr: src,
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DstAddr: dst,
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})
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e.Inject(ProtocolNumber, hdr.View().ToVectorisedView())
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stats := s.Stats().ICMP.V6PacketsReceived
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if got := stats.NeighborAdvert.Value(); got != want {
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t.Fatalf("got NeighborAdvert = %d, want = %d", got, want)
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}
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}
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2019-10-15 00:45:29 +00:00
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// testReceiveUDP tests receiving a UDP packet from src to dst. want is the
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2019-09-17 21:45:41 +00:00
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// expected UDP received count after receiving the packet.
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func testReceiveUDP(t *testing.T, s *stack.Stack, e *channel.Endpoint, src, dst tcpip.Address, want uint64) {
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t.Helper()
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wq := waiter.Queue{}
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we, ch := waiter.NewChannelEntry(nil)
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wq.EventRegister(&we, waiter.EventIn)
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defer wq.EventUnregister(&we)
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defer close(ch)
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ep, err := s.NewEndpoint(udp.ProtocolNumber, ProtocolNumber, &wq)
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if err != nil {
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t.Fatalf("NewEndpoint failed: %v", err)
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}
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defer ep.Close()
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if err := ep.Bind(tcpip.FullAddress{Addr: dst, Port: 80}); err != nil {
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t.Fatalf("ep.Bind(...) failed: %v", err)
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}
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// Receive UDP Packet.
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hdr := buffer.NewPrependable(header.IPv6MinimumSize + header.UDPMinimumSize)
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u := header.UDP(hdr.Prepend(header.UDPMinimumSize))
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u.Encode(&header.UDPFields{
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SrcPort: 5555,
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DstPort: 80,
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Length: header.UDPMinimumSize,
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})
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// UDP pseudo-header checksum.
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sum := header.PseudoHeaderChecksum(udp.ProtocolNumber, src, dst, header.UDPMinimumSize)
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// UDP checksum
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sum = header.Checksum(header.UDP([]byte{}), sum)
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u.SetChecksum(^u.CalculateChecksum(sum))
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payloadLength := hdr.UsedLength()
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ip := header.IPv6(hdr.Prepend(header.IPv6MinimumSize))
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ip.Encode(&header.IPv6Fields{
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PayloadLength: uint16(payloadLength),
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NextHeader: uint8(udp.ProtocolNumber),
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HopLimit: 255,
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SrcAddr: src,
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DstAddr: dst,
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})
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e.Inject(ProtocolNumber, hdr.View().ToVectorisedView())
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stat := s.Stats().UDP.PacketsReceived
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if got := stat.Value(); got != want {
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t.Fatalf("got UDPPacketsReceived = %d, want = %d", got, want)
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}
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}
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// TestReceiveOnAllNodesMulticastAddr tests that IPv6 endpoints receive ICMP and
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// UDP packets destined to the IPv6 link-local all-nodes multicast address.
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func TestReceiveOnAllNodesMulticastAddr(t *testing.T) {
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tests := []struct {
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2019-09-25 19:56:00 +00:00
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name string
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protocolFactory stack.TransportProtocol
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rxf func(t *testing.T, s *stack.Stack, e *channel.Endpoint, src, dst tcpip.Address, want uint64)
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}{
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2019-09-25 19:56:00 +00:00
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{"ICMP", icmp.NewProtocol6(), testReceiveICMP},
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{"UDP", udp.NewProtocol(), testReceiveUDP},
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2019-09-17 21:45:41 +00:00
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}
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for _, test := range tests {
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t.Run(test.name, func(t *testing.T) {
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2019-09-25 19:56:00 +00:00
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s := stack.New(stack.Options{
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NetworkProtocols: []stack.NetworkProtocol{NewProtocol()},
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TransportProtocols: []stack.TransportProtocol{test.protocolFactory},
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})
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e := channel.New(10, 1280, linkAddr1)
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if err := s.CreateNIC(1, e); err != nil {
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t.Fatalf("CreateNIC(_) = %s", err)
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}
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// Should receive a packet destined to the all-nodes
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// multicast address.
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test.rxf(t, s, e, addr1, header.IPv6AllNodesMulticastAddress, 1)
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})
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}
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}
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// TestReceiveOnSolicitedNodeAddr tests that IPv6 endpoints receive ICMP and UDP
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// packets destined to the IPv6 solicited-node address of an assigned IPv6
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// address.
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func TestReceiveOnSolicitedNodeAddr(t *testing.T) {
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tests := []struct {
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name string
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protocolFactory stack.TransportProtocol
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rxf func(t *testing.T, s *stack.Stack, e *channel.Endpoint, src, dst tcpip.Address, want uint64)
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}{
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2019-09-25 19:56:00 +00:00
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{"ICMP", icmp.NewProtocol6(), testReceiveICMP},
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{"UDP", udp.NewProtocol(), testReceiveUDP},
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2019-09-17 21:45:41 +00:00
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}
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snmc := header.SolicitedNodeAddr(addr2)
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for _, test := range tests {
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t.Run(test.name, func(t *testing.T) {
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2019-09-25 19:56:00 +00:00
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s := stack.New(stack.Options{
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NetworkProtocols: []stack.NetworkProtocol{NewProtocol()},
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TransportProtocols: []stack.TransportProtocol{test.protocolFactory},
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})
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2019-09-17 21:45:41 +00:00
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e := channel.New(10, 1280, linkAddr1)
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if err := s.CreateNIC(1, e); err != nil {
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t.Fatalf("CreateNIC(_) = %s", err)
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}
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// Should not receive a packet destined to the solicited
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// node address of addr2/addr3 yet as we haven't added
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// those addresses.
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test.rxf(t, s, e, addr1, snmc, 0)
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if err := s.AddAddress(1, ProtocolNumber, addr2); err != nil {
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t.Fatalf("AddAddress(_, %d, %s) = %s", ProtocolNumber, addr2, err)
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}
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// Should receive a packet destined to the solicited
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// node address of addr2/addr3 now that we have added
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// added addr2.
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test.rxf(t, s, e, addr1, snmc, 1)
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if err := s.AddAddress(1, ProtocolNumber, addr3); err != nil {
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t.Fatalf("AddAddress(_, %d, %s) = %s", ProtocolNumber, addr3, err)
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}
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// Should still receive a packet destined to the
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// solicited node address of addr2/addr3 now that we
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// have added addr3.
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test.rxf(t, s, e, addr1, snmc, 2)
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if err := s.RemoveAddress(1, addr2); err != nil {
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t.Fatalf("RemoveAddress(_, %s) = %s", addr2, err)
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}
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// Should still receive a packet destined to the
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// solicited node address of addr2/addr3 now that we
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// have removed addr2.
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test.rxf(t, s, e, addr1, snmc, 3)
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if err := s.RemoveAddress(1, addr3); err != nil {
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t.Fatalf("RemoveAddress(_, %s) = %s", addr3, err)
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}
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// Should not receive a packet destined to the solicited
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// node address of addr2/addr3 yet as both of them got
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// removed.
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test.rxf(t, s, e, addr1, snmc, 3)
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})
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}
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}
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// TestAddIpv6Address tests adding IPv6 addresses.
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func TestAddIpv6Address(t *testing.T) {
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tests := []struct {
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name string
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addr tcpip.Address
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}{
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// This test is in response to b/140943433.
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{
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"Nil",
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tcpip.Address([]byte(nil)),
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},
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{
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"ValidUnicast",
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addr1,
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},
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{
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"ValidLinkLocalUnicast",
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lladdr0,
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},
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}
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for _, test := range tests {
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t.Run(test.name, func(t *testing.T) {
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2019-09-25 19:56:00 +00:00
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s := stack.New(stack.Options{
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NetworkProtocols: []stack.NetworkProtocol{NewProtocol()},
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})
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2019-09-17 21:45:41 +00:00
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if err := s.CreateNIC(1, &stubLinkEndpoint{}); err != nil {
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t.Fatalf("CreateNIC(_) = %s", err)
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}
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if err := s.AddAddress(1, ProtocolNumber, test.addr); err != nil {
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t.Fatalf("AddAddress(_, %d, nil) = %s", ProtocolNumber, err)
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}
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addr, err := s.GetMainNICAddress(1, header.IPv6ProtocolNumber)
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if err != nil {
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t.Fatalf("stack.GetMainNICAddress(_, _) err = %s", err)
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}
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if addr.Address != test.addr {
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t.Fatalf("got stack.GetMainNICAddress(_, _) = %s, want = %s", addr.Address, test.addr)
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}
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})
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}
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}
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