xref: /linux/tools/testing/selftests/net/traceroute.sh (revision 06d07429858317ded2db7986113a9e0129cd599b)
1#!/bin/bash
2# SPDX-License-Identifier: GPL-2.0
3#
4# Run traceroute/traceroute6 tests
5#
6
7source lib.sh
8VERBOSE=0
9PAUSE_ON_FAIL=no
10
11################################################################################
12#
13log_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
35run_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
64create_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.
91connect_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
159cleanup_traceroute6()
160{
161	cleanup_ns $h1 $h2 $r1 $r2
162}
163
164setup_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 $h1 ping6 -c5 2000:103::4 >/dev/null 2>&1
200
201	set +e
202}
203
204run_traceroute6()
205{
206	if [ ! -x "$(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
235cleanup_traceroute()
236{
237	cleanup_ns $h1 $h2 $router
238}
239
240setup_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 $h1 ping -c5 1.0.2.4 >/dev/null 2>&1
265
266	set +e
267}
268
269run_traceroute()
270{
271	if [ ! -x "$(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
288run_tests()
289{
290	run_traceroute6
291	run_traceroute
292}
293
294################################################################################
295# main
296
297declare -i nfail=0
298declare -i nsuccess=0
299
300while getopts :pv o
301do
302	case $o in
303		p) PAUSE_ON_FAIL=yes;;
304		v) VERBOSE=$(($VERBOSE + 1));;
305		*) exit 1;;
306	esac
307done
308
309run_tests
310
311printf "\nTests passed: %3d\n" ${nsuccess}
312printf "Tests failed: %3d\n"   ${nfail}
313