1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
|
// Copyright 2019 The gVisor Authors.
//
// 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 (
"testing"
"gvisor.dev/gvisor/pkg/tcpip"
"gvisor.dev/gvisor/pkg/tcpip/buffer"
"gvisor.dev/gvisor/pkg/tcpip/header"
"gvisor.dev/gvisor/pkg/tcpip/link/channel"
"gvisor.dev/gvisor/pkg/tcpip/stack"
"gvisor.dev/gvisor/pkg/tcpip/transport/icmp"
"gvisor.dev/gvisor/pkg/tcpip/transport/udp"
"gvisor.dev/gvisor/pkg/waiter"
)
const (
addr1 = "\x0a\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01"
addr2 = "\x0a\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02"
// The least significant 3 bytes are the same as addr2 so both addr2 and
// addr3 will have the same solicited-node address.
addr3 = "\x0a\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x02"
)
// testReceiveICMP tests receiving an ICMP packet from src to dst. want is the
// expected Neighbor Advertisement received count after receiving the packet.
func testReceiveICMP(t *testing.T, s *stack.Stack, e *channel.Endpoint, src, dst tcpip.Address, want uint64) {
t.Helper()
// Receive ICMP packet.
hdr := buffer.NewPrependable(header.IPv6MinimumSize + header.ICMPv6NeighborAdvertSize)
pkt := header.ICMPv6(hdr.Prepend(header.ICMPv6NeighborAdvertSize))
pkt.SetType(header.ICMPv6NeighborAdvert)
pkt.SetChecksum(header.ICMPv6Checksum(pkt, src, dst, buffer.VectorisedView{}))
payloadLength := hdr.UsedLength()
ip := header.IPv6(hdr.Prepend(header.IPv6MinimumSize))
ip.Encode(&header.IPv6Fields{
PayloadLength: uint16(payloadLength),
NextHeader: uint8(header.ICMPv6ProtocolNumber),
HopLimit: 255,
SrcAddr: src,
DstAddr: dst,
})
e.Inject(ProtocolNumber, hdr.View().ToVectorisedView())
stats := s.Stats().ICMP.V6PacketsReceived
if got := stats.NeighborAdvert.Value(); got != want {
t.Fatalf("got NeighborAdvert = %d, want = %d", got, want)
}
}
// testReceiveICMP tests receiving a UDP packet from src to dst. want is the
// expected UDP received count after receiving the packet.
func testReceiveUDP(t *testing.T, s *stack.Stack, e *channel.Endpoint, src, dst tcpip.Address, want uint64) {
t.Helper()
wq := waiter.Queue{}
we, ch := waiter.NewChannelEntry(nil)
wq.EventRegister(&we, waiter.EventIn)
defer wq.EventUnregister(&we)
defer close(ch)
ep, err := s.NewEndpoint(udp.ProtocolNumber, ProtocolNumber, &wq)
if err != nil {
t.Fatalf("NewEndpoint failed: %v", err)
}
defer ep.Close()
if err := ep.Bind(tcpip.FullAddress{Addr: dst, Port: 80}); err != nil {
t.Fatalf("ep.Bind(...) failed: %v", err)
}
// Receive UDP Packet.
hdr := buffer.NewPrependable(header.IPv6MinimumSize + header.UDPMinimumSize)
u := header.UDP(hdr.Prepend(header.UDPMinimumSize))
u.Encode(&header.UDPFields{
SrcPort: 5555,
DstPort: 80,
Length: header.UDPMinimumSize,
})
// UDP pseudo-header checksum.
sum := header.PseudoHeaderChecksum(udp.ProtocolNumber, src, dst, header.UDPMinimumSize)
// UDP checksum
sum = header.Checksum(header.UDP([]byte{}), sum)
u.SetChecksum(^u.CalculateChecksum(sum))
payloadLength := hdr.UsedLength()
ip := header.IPv6(hdr.Prepend(header.IPv6MinimumSize))
ip.Encode(&header.IPv6Fields{
PayloadLength: uint16(payloadLength),
NextHeader: uint8(udp.ProtocolNumber),
HopLimit: 255,
SrcAddr: src,
DstAddr: dst,
})
e.Inject(ProtocolNumber, hdr.View().ToVectorisedView())
stat := s.Stats().UDP.PacketsReceived
if got := stat.Value(); got != want {
t.Fatalf("got UDPPacketsReceived = %d, want = %d", got, want)
}
}
// TestReceiveOnAllNodesMulticastAddr tests that IPv6 endpoints receive ICMP and
// UDP packets destined to the IPv6 link-local all-nodes multicast address.
func TestReceiveOnAllNodesMulticastAddr(t *testing.T) {
tests := []struct {
name string
protocolName string
rxf func(t *testing.T, s *stack.Stack, e *channel.Endpoint, src, dst tcpip.Address, want uint64)
}{
{"ICMP", icmp.ProtocolName6, testReceiveICMP},
{"UDP", udp.ProtocolName, testReceiveUDP},
}
for _, test := range tests {
t.Run(test.name, func(t *testing.T) {
s := stack.New([]string{ProtocolName}, []string{test.protocolName}, stack.Options{})
e := channel.New(10, 1280, linkAddr1)
if err := s.CreateNIC(1, e); err != nil {
t.Fatalf("CreateNIC(_) = %s", err)
}
// Should receive a packet destined to the all-nodes
// multicast address.
test.rxf(t, s, e, addr1, header.IPv6AllNodesMulticastAddress, 1)
})
}
}
// TestReceiveOnSolicitedNodeAddr tests that IPv6 endpoints receive ICMP and UDP
// packets destined to the IPv6 solicited-node address of an assigned IPv6
// address.
func TestReceiveOnSolicitedNodeAddr(t *testing.T) {
tests := []struct {
name string
protocolName string
rxf func(t *testing.T, s *stack.Stack, e *channel.Endpoint, src, dst tcpip.Address, want uint64)
}{
{"ICMP", icmp.ProtocolName6, testReceiveICMP},
{"UDP", udp.ProtocolName, testReceiveUDP},
}
snmc := header.SolicitedNodeAddr(addr2)
for _, test := range tests {
t.Run(test.name, func(t *testing.T) {
s := stack.New([]string{ProtocolName}, []string{test.protocolName}, stack.Options{})
e := channel.New(10, 1280, linkAddr1)
if err := s.CreateNIC(1, e); err != nil {
t.Fatalf("CreateNIC(_) = %s", err)
}
// Should not receive a packet destined to the solicited
// node address of addr2/addr3 yet as we haven't added
// those addresses.
test.rxf(t, s, e, addr1, snmc, 0)
if err := s.AddAddress(1, ProtocolNumber, addr2); err != nil {
t.Fatalf("AddAddress(_, %d, %s) = %s", ProtocolNumber, addr2, err)
}
// Should receive a packet destined to the solicited
// node address of addr2/addr3 now that we have added
// added addr2.
test.rxf(t, s, e, addr1, snmc, 1)
if err := s.AddAddress(1, ProtocolNumber, addr3); err != nil {
t.Fatalf("AddAddress(_, %d, %s) = %s", ProtocolNumber, addr3, err)
}
// Should still receive a packet destined to the
// solicited node address of addr2/addr3 now that we
// have added addr3.
test.rxf(t, s, e, addr1, snmc, 2)
if err := s.RemoveAddress(1, addr2); err != nil {
t.Fatalf("RemoveAddress(_, %s) = %s", addr2, err)
}
// Should still receive a packet destined to the
// solicited node address of addr2/addr3 now that we
// have removed addr2.
test.rxf(t, s, e, addr1, snmc, 3)
if err := s.RemoveAddress(1, addr3); err != nil {
t.Fatalf("RemoveAddress(_, %s) = %s", addr3, err)
}
// Should not receive a packet destined to the solicited
// node address of addr2/addr3 yet as both of them got
// removed.
test.rxf(t, s, e, addr1, snmc, 3)
})
}
}
// TestAddIpv6Address tests adding IPv6 addresses.
func TestAddIpv6Address(t *testing.T) {
tests := []struct {
name string
addr tcpip.Address
}{
// This test is in response to b/140943433.
{
"Nil",
tcpip.Address([]byte(nil)),
},
{
"ValidUnicast",
addr1,
},
{
"ValidLinkLocalUnicast",
lladdr0,
},
}
for _, test := range tests {
t.Run(test.name, func(t *testing.T) {
s := stack.New([]string{ProtocolName}, nil, stack.Options{})
if err := s.CreateNIC(1, &stubLinkEndpoint{}); err != nil {
t.Fatalf("CreateNIC(_) = %s", err)
}
if err := s.AddAddress(1, ProtocolNumber, test.addr); err != nil {
t.Fatalf("AddAddress(_, %d, nil) = %s", ProtocolNumber, err)
}
addr, err := s.GetMainNICAddress(1, header.IPv6ProtocolNumber)
if err != nil {
t.Fatalf("stack.GetMainNICAddress(_, _) err = %s", err)
}
if addr.Address != test.addr {
t.Fatalf("got stack.GetMainNICAddress(_, _) = %s, want = %s", addr.Address, test.addr)
}
})
}
}
|
