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
|
// Copyright 2018 Google Inc.
//
// 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 arp_test
import (
"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/network/arp"
"gvisor.googlesource.com/gvisor/pkg/tcpip/network/ipv4"
"gvisor.googlesource.com/gvisor/pkg/tcpip/stack"
"gvisor.googlesource.com/gvisor/pkg/tcpip/transport/ping"
)
const (
stackLinkAddr = tcpip.LinkAddress("\x0a\x0a\x0b\x0b\x0c\x0c")
stackAddr1 = tcpip.Address("\x0a\x00\x00\x01")
stackAddr2 = tcpip.Address("\x0a\x00\x00\x02")
stackAddrBad = tcpip.Address("\x0a\x00\x00\x03")
)
type testContext struct {
t *testing.T
linkEP *channel.Endpoint
s *stack.Stack
}
func newTestContext(t *testing.T) *testContext {
s := stack.New([]string{ipv4.ProtocolName, arp.ProtocolName}, []string{ping.ProtocolName4}, stack.Options{})
const defaultMTU = 65536
id, linkEP := channel.New(256, defaultMTU, stackLinkAddr)
if testing.Verbose() {
id = sniffer.New(id)
}
if err := s.CreateNIC(1, id); err != nil {
t.Fatalf("CreateNIC failed: %v", err)
}
if err := s.AddAddress(1, ipv4.ProtocolNumber, stackAddr1); err != nil {
t.Fatalf("AddAddress for ipv4 failed: %v", err)
}
if err := s.AddAddress(1, ipv4.ProtocolNumber, stackAddr2); err != nil {
t.Fatalf("AddAddress for ipv4 failed: %v", err)
}
if err := s.AddAddress(1, arp.ProtocolNumber, arp.ProtocolAddress); err != nil {
t.Fatalf("AddAddress for arp failed: %v", err)
}
s.SetRouteTable([]tcpip.Route{{
Destination: "\x00\x00\x00\x00",
Mask: "\x00\x00\x00\x00",
Gateway: "",
NIC: 1,
}})
return &testContext{
t: t,
s: s,
linkEP: linkEP,
}
}
func (c *testContext) cleanup() {
close(c.linkEP.C)
}
func TestDirectRequest(t *testing.T) {
c := newTestContext(t)
defer c.cleanup()
const senderMAC = "\x01\x02\x03\x04\x05\x06"
const senderIPv4 = "\x0a\x00\x00\x02"
v := make(buffer.View, header.ARPSize)
h := header.ARP(v)
h.SetIPv4OverEthernet()
h.SetOp(header.ARPRequest)
copy(h.HardwareAddressSender(), senderMAC)
copy(h.ProtocolAddressSender(), senderIPv4)
inject := func(addr tcpip.Address) {
copy(h.ProtocolAddressTarget(), addr)
c.linkEP.Inject(arp.ProtocolNumber, v.ToVectorisedView())
}
inject(stackAddr1)
{
pkt := <-c.linkEP.C
if pkt.Proto != arp.ProtocolNumber {
t.Fatalf("stackAddr1: expected ARP response, got network protocol number %v", pkt.Proto)
}
rep := header.ARP(pkt.Header)
if !rep.IsValid() {
t.Fatalf("stackAddr1: invalid ARP response len(pkt.Header)=%d", len(pkt.Header))
}
if tcpip.Address(rep.ProtocolAddressSender()) != stackAddr1 {
t.Errorf("stackAddr1: expected sender to be set")
}
if got := tcpip.LinkAddress(rep.HardwareAddressSender()); got != stackLinkAddr {
t.Errorf("stackAddr1: expected sender to be stackLinkAddr, got %q", got)
}
}
inject(stackAddr2)
{
pkt := <-c.linkEP.C
if pkt.Proto != arp.ProtocolNumber {
t.Fatalf("stackAddr2: expected ARP response, got network protocol number %v", pkt.Proto)
}
rep := header.ARP(pkt.Header)
if !rep.IsValid() {
t.Fatalf("stackAddr2: invalid ARP response len(pkt.Header)=%d", len(pkt.Header))
}
if tcpip.Address(rep.ProtocolAddressSender()) != stackAddr2 {
t.Errorf("stackAddr2: expected sender to be set")
}
if got := tcpip.LinkAddress(rep.HardwareAddressSender()); got != stackLinkAddr {
t.Errorf("stackAddr2: expected sender to be stackLinkAddr, got %q", got)
}
}
inject(stackAddrBad)
select {
case pkt := <-c.linkEP.C:
t.Errorf("stackAddrBad: unexpected packet sent, Proto=%v", pkt.Proto)
case <-time.After(100 * time.Millisecond):
// Sleep tests are gross, but this will only potentially flake
// if there's a bug. If there is no bug this will reliably
// succeed.
}
}
|
