1 #!/bin/bash
2 # SPDX-License-Identifier: GPL-2.0
3 #
4 # Run traceroute/traceroute6 tests
5 #
6
7 source lib.sh
8 VERBOSE=0
9 PAUSE_ON_FAIL=no
10
11 ################################################################################
12 #
13 log_test()
14 {
15 local rc=$1
16 local expected=$2
17 local msg="$3"
18
19 if [ ${rc} -eq ${expected} ]; then
20 printf "TEST: %-60s [ OK ]\n" "${msg}"
21 nsuccess=$((nsuccess+1))
22 else
23 ret=1
24 nfail=$((nfail+1))
25 printf "TEST: %-60s [FAIL]\n" "${msg}"
26 if [ "${PAUSE_ON_FAIL}" = "yes" ]; then
27 echo
28 echo "hit enter to continue, 'q' to quit"
29 read a
30 [ "$a" = "q" ] && exit 1
31 fi
32 fi
33 }
34
35 run_cmd()
36 {
37 local ns
38 local cmd
39 local out
40 local rc
41
42 ns="$1"
43 shift
44 cmd="$*"
45
46 if [ "$VERBOSE" = "1" ]; then
47 printf " COMMAND: $cmd\n"
48 fi
49
50 out=$(eval ip netns exec ${ns} ${cmd} 2>&1)
51 rc=$?
52 if [ "$VERBOSE" = "1" -a -n "$out" ]; then
53 echo " $out"
54 fi
55
56 [ "$VERBOSE" = "1" ] && echo
57
58 return $rc
59 }
60
61 ################################################################################
62 # create namespaces and interconnects
63
64 create_ns()
65 {
66 local ns=$1
67 local addr=$2
68 local addr6=$3
69
70 [ -z "${addr}" ] && addr="-"
71 [ -z "${addr6}" ] && addr6="-"
72
73 if [ "${addr}" != "-" ]; then
74 ip netns exec ${ns} ip addr add dev lo ${addr}
75 fi
76 if [ "${addr6}" != "-" ]; then
77 ip netns exec ${ns} ip -6 addr add dev lo ${addr6}
78 fi
79
80 ip netns exec ${ns} ip ro add unreachable default metric 8192
81 ip netns exec ${ns} ip -6 ro add unreachable default metric 8192
82
83 ip netns exec ${ns} sysctl -qw net.ipv4.ip_forward=1
84 ip netns exec ${ns} sysctl -qw net.ipv6.conf.all.keep_addr_on_down=1
85 ip netns exec ${ns} sysctl -qw net.ipv6.conf.all.forwarding=1
86 ip netns exec ${ns} sysctl -qw net.ipv6.conf.default.forwarding=1
87 ip netns exec ${ns} sysctl -qw net.ipv6.conf.default.accept_dad=0
88 }
89
90 # create veth pair to connect namespaces and apply addresses.
91 connect_ns()
92 {
93 local ns1=$1
94 local ns1_dev=$2
95 local ns1_addr=$3
96 local ns1_addr6=$4
97 local ns2=$5
98 local ns2_dev=$6
99 local ns2_addr=$7
100 local ns2_addr6=$8
101
102 ip netns exec ${ns1} ip li add ${ns1_dev} type veth peer name tmp
103 ip netns exec ${ns1} ip li set ${ns1_dev} up
104 ip netns exec ${ns1} ip li set tmp netns ${ns2} name ${ns2_dev}
105 ip netns exec ${ns2} ip li set ${ns2_dev} up
106
107 if [ "${ns1_addr}" != "-" ]; then
108 ip netns exec ${ns1} ip addr add dev ${ns1_dev} ${ns1_addr}
109 fi
110
111 if [ "${ns2_addr}" != "-" ]; then
112 ip netns exec ${ns2} ip addr add dev ${ns2_dev} ${ns2_addr}
113 fi
114
115 if [ "${ns1_addr6}" != "-" ]; then
116 ip netns exec ${ns1} ip addr add dev ${ns1_dev} ${ns1_addr6}
117 fi
118
119 if [ "${ns2_addr6}" != "-" ]; then
120 ip netns exec ${ns2} ip addr add dev ${ns2_dev} ${ns2_addr6}
121 fi
122 }
123
124 ################################################################################
125 # traceroute6 test
126 #
127 # Verify that in this scenario
128 #
129 # ------------------------ N2
130 # | |
131 # ------ ------ N3 ----
132 # | R1 | | R2 |------|H2|
133 # ------ ------ ----
134 # | |
135 # ------------------------ N1
136 # |
137 # ----
138 # |H1|
139 # ----
140 #
141 # where H1's default route goes through R1 and R1's default route goes
142 # through R2 over N2, traceroute6 from H1 to H2 reports R2's address
143 # on N2 and not N1.
144 #
145 # Addresses are assigned as follows:
146 #
147 # N1: 2000:101::/64
148 # N2: 2000:102::/64
149 # N3: 2000:103::/64
150 #
151 # R1's host part of address: 1
152 # R2's host part of address: 2
153 # H1's host part of address: 3
154 # H2's host part of address: 4
155 #
156 # For example:
157 # the IPv6 address of R1's interface on N2 is 2000:102::1/64
158
159 cleanup_traceroute6()
160 {
161 cleanup_ns $h1 $h2 $r1 $r2
162 }
163
164 setup_traceroute6()
165 {
166 brdev=br0
167
168 # start clean
169 cleanup_traceroute6
170
171 set -e
172 setup_ns h1 h2 r1 r2
173 create_ns $h1
174 create_ns $h2
175 create_ns $r1
176 create_ns $r2
177
178 # Setup N3
179 connect_ns $r2 eth3 - 2000:103::2/64 $h2 eth3 - 2000:103::4/64
180 ip netns exec $h2 ip route add default via 2000:103::2
181
182 # Setup N2
183 connect_ns $r1 eth2 - 2000:102::1/64 $r2 eth2 - 2000:102::2/64
184 ip netns exec $r1 ip route add default via 2000:102::2
185
186 # Setup N1. host-1 and router-2 connect to a bridge in router-1.
187 ip netns exec $r1 ip link add name ${brdev} type bridge
188 ip netns exec $r1 ip link set ${brdev} up
189 ip netns exec $r1 ip addr add 2000:101::1/64 dev ${brdev}
190
191 connect_ns $h1 eth0 - 2000:101::3/64 $r1 eth0 - -
192 ip netns exec $r1 ip link set dev eth0 master ${brdev}
193 ip netns exec $h1 ip route add default via 2000:101::1
194
195 connect_ns $r2 eth1 - 2000:101::2/64 $r1 eth1 - -
196 ip netns exec $r1 ip link set dev eth1 master ${brdev}
197
198 # Prime the network
199 ip netns exec $h1 ping6 -c5 2000:103::4 >/dev/null 2>&1
200
201 set +e
202 }
203
204 run_traceroute6()
205 {
206 if [ ! -x "$(command -v traceroute6)" ]; then
207 echo "SKIP: Could not run IPV6 test without traceroute6"
208 return
209 fi
210
211 setup_traceroute6
212
213 # traceroute6 host-2 from host-1 (expects 2000:102::2)
214 run_cmd $h1 "traceroute6 2000:103::4 | grep -q 2000:102::2"
215 log_test $? 0 "IPV6 traceroute"
216
217 cleanup_traceroute6
218 }
219
220 ################################################################################
221 # traceroute test
222 #
223 # Verify that traceroute from H1 to H2 shows 1.0.1.1 in this scenario
224 #
225 # 1.0.3.1/24
226 # ---- 1.0.1.3/24 1.0.1.1/24 ---- 1.0.2.1/24 1.0.2.4/24 ----
227 # |H1|--------------------------|R1|--------------------------|H2|
228 # ---- N1 ---- N2 ----
229 #
230 # where net.ipv4.icmp_errors_use_inbound_ifaddr is set on R1 and
231 # 1.0.3.1/24 and 1.0.1.1/24 are respectively R1's primary and secondary
232 # address on N1.
233 #
234
235 cleanup_traceroute()
236 {
237 cleanup_ns $h1 $h2 $router
238 }
239
240 setup_traceroute()
241 {
242 # start clean
243 cleanup_traceroute
244
245 set -e
246 setup_ns h1 h2 router
247 create_ns $h1
248 create_ns $h2
249 create_ns $router
250
251 connect_ns $h1 eth0 1.0.1.3/24 - \
252 $router eth1 1.0.3.1/24 -
253 ip netns exec $h1 ip route add default via 1.0.1.1
254
255 ip netns exec $router ip addr add 1.0.1.1/24 dev eth1
256 ip netns exec $router sysctl -qw \
257 net.ipv4.icmp_errors_use_inbound_ifaddr=1
258
259 connect_ns $h2 eth0 1.0.2.4/24 - \
260 $router eth2 1.0.2.1/24 -
261 ip netns exec $h2 ip route add default via 1.0.2.1
262
263 # Prime the network
264 ip netns exec $h1 ping -c5 1.0.2.4 >/dev/null 2>&1
265
266 set +e
267 }
268
269 run_traceroute()
270 {
271 if [ ! -x "$(command -v traceroute)" ]; then
272 echo "SKIP: Could not run IPV4 test without traceroute"
273 return
274 fi
275
276 setup_traceroute
277
278 # traceroute host-2 from host-1 (expects 1.0.1.1). Takes a while.
279 run_cmd $h1 "traceroute 1.0.2.4 | grep -q 1.0.1.1"
280 log_test $? 0 "IPV4 traceroute"
281
282 cleanup_traceroute
283 }
284
285 ################################################################################
286 # Run tests
287
288 run_tests()
289 {
290 run_traceroute6
291 run_traceroute
292 }
293
294 ################################################################################
295 # main
296
297 declare -i nfail=0
298 declare -i nsuccess=0
299
300 while getopts :pv o
301 do
302 case $o in
303 p) PAUSE_ON_FAIL=yes;;
304 v) VERBOSE=$(($VERBOSE + 1));;
305 *) exit 1;;
306 esac
307 done
308
309 run_tests
310
311 printf "\nTests passed: %3d\n" ${nsuccess}
312 printf "Tests failed: %3d\n" ${nfail}
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