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
|
#!/bin/bash
# SPDX-License-Identifier: GPL-2.0+
#
# Author: Justin Iurman <justin.iurman@uliege.be>
#
# WARNING
# -------
# This is just a dummy script that triggers encap cases with possible dst cache
# reference loops in affected lwt users (see list below). Some cases are
# pathological configurations for simplicity, others are valid. Overall, we
# don't want this issue to happen, no matter what. In order to catch any
# reference loops, kmemleak MUST be used. The results alone are always blindly
# successful, don't rely on them. Note that the following tests may crash the
# kernel if the fix to prevent lwtunnel_{input|output|xmit}() reentry loops is
# not present.
#
# Affected lwt users so far (please update accordingly if needed):
# - ila_lwt (output only)
# - ioam6_iptunnel (output only)
# - rpl_iptunnel (both input and output)
# - seg6_iptunnel (both input and output)
source lib.sh
check_compatibility()
{
setup_ns tmp_node &>/dev/null
if [ $? != 0 ]; then
echo "SKIP: Cannot create netns."
exit $ksft_skip
fi
ip link add name veth0 netns $tmp_node type veth \
peer name veth1 netns $tmp_node &>/dev/null
local ret=$?
ip -netns $tmp_node link set veth0 up &>/dev/null
ret=$((ret + $?))
ip -netns $tmp_node link set veth1 up &>/dev/null
ret=$((ret + $?))
if [ $ret != 0 ]; then
echo "SKIP: Cannot configure links."
cleanup_ns $tmp_node
exit $ksft_skip
fi
lsmod 2>/dev/null | grep -q "ila"
ila_lsmod=$?
[ $ila_lsmod != 0 ] && modprobe ila &>/dev/null
ip -netns $tmp_node route add 2001:db8:1::/64 \
encap ila 1:2:3:4 csum-mode no-action ident-type luid \
hook-type output \
dev veth0 &>/dev/null
ip -netns $tmp_node route add 2001:db8:2::/64 \
encap ioam6 trace prealloc type 0x800000 ns 0 size 4 \
dev veth0 &>/dev/null
ip -netns $tmp_node route add 2001:db8:3::/64 \
encap rpl segs 2001:db8:3::1 dev veth0 &>/dev/null
ip -netns $tmp_node route add 2001:db8:4::/64 \
encap seg6 mode inline segs 2001:db8:4::1 dev veth0 &>/dev/null
ip -netns $tmp_node -6 route 2>/dev/null | grep -q "encap ila"
skip_ila=$?
ip -netns $tmp_node -6 route 2>/dev/null | grep -q "encap ioam6"
skip_ioam6=$?
ip -netns $tmp_node -6 route 2>/dev/null | grep -q "encap rpl"
skip_rpl=$?
ip -netns $tmp_node -6 route 2>/dev/null | grep -q "encap seg6"
skip_seg6=$?
cleanup_ns $tmp_node
}
setup()
{
setup_ns alpha beta gamma &>/dev/null
ip link add name veth-alpha netns $alpha type veth \
peer name veth-betaL netns $beta &>/dev/null
ip link add name veth-betaR netns $beta type veth \
peer name veth-gamma netns $gamma &>/dev/null
ip -netns $alpha link set veth-alpha name veth0 &>/dev/null
ip -netns $beta link set veth-betaL name veth0 &>/dev/null
ip -netns $beta link set veth-betaR name veth1 &>/dev/null
ip -netns $gamma link set veth-gamma name veth0 &>/dev/null
ip -netns $alpha addr add 2001:db8:1::2/64 dev veth0 &>/dev/null
ip -netns $alpha link set veth0 up &>/dev/null
ip -netns $alpha link set lo up &>/dev/null
ip -netns $alpha route add 2001:db8:2::/64 \
via 2001:db8:1::1 dev veth0 &>/dev/null
ip -netns $beta addr add 2001:db8:1::1/64 dev veth0 &>/dev/null
ip -netns $beta addr add 2001:db8:2::1/64 dev veth1 &>/dev/null
ip -netns $beta link set veth0 up &>/dev/null
ip -netns $beta link set veth1 up &>/dev/null
ip -netns $beta link set lo up &>/dev/null
ip -netns $beta route del 2001:db8:2::/64
ip -netns $beta route add 2001:db8:2::/64 dev veth1
ip netns exec $beta \
sysctl -wq net.ipv6.conf.all.forwarding=1 &>/dev/null
ip -netns $gamma addr add 2001:db8:2::2/64 dev veth0 &>/dev/null
ip -netns $gamma link set veth0 up &>/dev/null
ip -netns $gamma link set lo up &>/dev/null
ip -netns $gamma route add 2001:db8:1::/64 \
via 2001:db8:2::1 dev veth0 &>/dev/null
sleep 1
ip netns exec $alpha ping6 -c 5 -W 1 2001:db8:2::2 &>/dev/null
if [ $? != 0 ]; then
echo "SKIP: Setup failed."
exit $ksft_skip
fi
sleep 1
}
cleanup()
{
cleanup_ns $alpha $beta $gamma
[ $ila_lsmod != 0 ] && modprobe -r ila &>/dev/null
}
run_ila()
{
if [ $skip_ila != 0 ]; then
echo "SKIP: ila (output)"
return
fi
ip -netns $beta route del 2001:db8:2::/64
ip -netns $beta route add 2001:db8:2:0:0:0:0:2/128 \
encap ila 2001:db8:2:0 csum-mode no-action ident-type luid \
hook-type output \
dev veth1 &>/dev/null
sleep 1
echo "TEST: ila (output)"
ip netns exec $beta ping6 -c 2 -W 1 2001:db8:2::2 &>/dev/null
sleep 1
ip -netns $beta route del 2001:db8:2:0:0:0:0:2/128
ip -netns $beta route add 2001:db8:2::/64 dev veth1
sleep 1
}
run_ioam6()
{
if [ $skip_ioam6 != 0 ]; then
echo "SKIP: ioam6 (output)"
return
fi
ip -netns $beta route change 2001:db8:2::/64 \
encap ioam6 trace prealloc type 0x800000 ns 1 size 4 \
dev veth1 &>/dev/null
sleep 1
echo "TEST: ioam6 (output)"
ip netns exec $beta ping6 -c 2 -W 1 2001:db8:2::2 &>/dev/null
sleep 1
}
run_rpl()
{
if [ $skip_rpl != 0 ]; then
echo "SKIP: rpl (input)"
echo "SKIP: rpl (output)"
return
fi
ip -netns $beta route change 2001:db8:2::/64 \
encap rpl segs 2001:db8:2::2 \
dev veth1 &>/dev/null
sleep 1
echo "TEST: rpl (input)"
ip netns exec $alpha ping6 -c 2 -W 1 2001:db8:2::2 &>/dev/null
sleep 1
echo "TEST: rpl (output)"
ip netns exec $beta ping6 -c 2 -W 1 2001:db8:2::2 &>/dev/null
sleep 1
}
run_seg6()
{
if [ $skip_seg6 != 0 ]; then
echo "SKIP: seg6 (input)"
echo "SKIP: seg6 (output)"
return
fi
ip -netns $beta route change 2001:db8:2::/64 \
encap seg6 mode inline segs 2001:db8:2::2 \
dev veth1 &>/dev/null
sleep 1
echo "TEST: seg6 (input)"
ip netns exec $alpha ping6 -c 2 -W 1 2001:db8:2::2 &>/dev/null
sleep 1
echo "TEST: seg6 (output)"
ip netns exec $beta ping6 -c 2 -W 1 2001:db8:2::2 &>/dev/null
sleep 1
}
run()
{
run_ila
run_ioam6
run_rpl
run_seg6
}
if [ "$(id -u)" -ne 0 ]; then
echo "SKIP: Need root privileges."
exit $ksft_skip
fi
if [ ! -x "$(command -v ip)" ]; then
echo "SKIP: Could not run test without ip tool."
exit $ksft_skip
fi
check_compatibility
trap cleanup EXIT
setup
run
exit $ksft_pass
|
