fib_nexthop_multiprefix.sh

  1#!/bin/bash
  2# SPDX-License-Identifier: GPL-2.0
  3#
  4# Validate cached routes in fib{6}_nh that is used by multiple prefixes.
  5# Validate a different # exception is generated in h0 for each remote host.
  6#
  7#               h1
  8#            /
  9#    h0 - r1 -  h2
 10#            \
 11#               h3
 12#
 13# routing in h0 to hN is done with nexthop objects.
 14
 15source lib.sh
 16PAUSE_ON_FAIL=no
 17VERBOSE=0
 18
 19which ping6 > /dev/null 2>&1 && ping6=$(which ping6) || ping6=$(which ping)
 20
 21################################################################################
 22# helpers
 23
 24log_test()
 25{
 26	local rc=$1
 27	local expected=$2
 28	local msg="$3"
 29
 30	if [ ${rc} -eq ${expected} ]; then
 31		printf "TEST: %-60s  [ OK ]\n" "${msg}"
 32		nsuccess=$((nsuccess+1))
 33	else
 34		ret=1
 35		nfail=$((nfail+1))
 36		printf "TEST: %-60s  [FAIL]\n" "${msg}"
 37		if [ "${PAUSE_ON_FAIL}" = "yes" ]; then
 38			echo
 39			echo "hit enter to continue, 'q' to quit"
 40			read a
 41			[ "$a" = "q" ] && exit 1
 42		fi
 43	fi
 44
 45	[ "$VERBOSE" = "1" ] && echo
 46}
 47
 48run_cmd()
 49{
 50	local cmd="$*"
 51	local out
 52	local rc
 53
 54	if [ "$VERBOSE" = "1" ]; then
 55		echo "COMMAND: $cmd"
 56	fi
 57
 58	out=$(eval $cmd 2>&1)
 59	rc=$?
 60	if [ "$VERBOSE" = "1" -a -n "$out" ]; then
 61		echo "$out"
 62	fi
 63
 64	[ "$VERBOSE" = "1" ] && echo
 65
 66	return $rc
 67}
 68
 69################################################################################
 70# config
 71
 72create_ns()
 73{
 74	local ns=${1}
 75
 76	ip netns exec ${ns} sysctl -q -w net.ipv6.conf.all.keep_addr_on_down=1
 77	case ${ns} in
 78	h*)
 79		ip netns exec $ns sysctl -q -w net.ipv6.conf.all.forwarding=0
 80		;;
 81	r*)
 82		ip netns exec $ns sysctl -q -w net.ipv4.ip_forward=1
 83		ip netns exec $ns sysctl -q -w net.ipv6.conf.all.forwarding=1
 84		;;
 85	esac
 86}
 87
 88setup()
 89{
 90	local ns
 91	local i
 92
 93	#set -e
 94
 95	setup_ns h0 r1 h1 h2 h3
 96	h[0]=$h0
 97	h[1]=$h1
 98	h[2]=$h2
 99	h[3]=$h3
100	r[1]=$r1
101	for ns in ${h[0]} ${r[1]} ${h[1]} ${h[2]} ${h[3]}
102	do
103		create_ns ${ns}
104	done
105
106	#
107	# create interconnects
108	#
109
110	for i in 0 1 2 3
111	do
112		ip -netns ${h[$i]} li add eth0 type veth peer name r1h${i}
113		ip -netns ${h[$i]} li set eth0 up
114		ip -netns ${h[$i]} li set r1h${i} netns ${r[1]} name eth${i} up
115
116		ip -netns ${h[$i]}    addr add dev eth0 172.16.10${i}.1/24
117		ip -netns ${h[$i]} -6 addr add dev eth0 2001:db8:10${i}::1/64
118		ip -netns ${r[1]}    addr add dev eth${i} 172.16.10${i}.254/24
119		ip -netns ${r[1]} -6 addr add dev eth${i} 2001:db8:10${i}::64/64
120	done
121
122	ip -netns ${h[0]} nexthop add id 4 via 172.16.100.254 dev eth0
123	ip -netns ${h[0]} nexthop add id 6 via 2001:db8:100::64 dev eth0
124
125	# routing from ${h[0]} to h1-h3 and back
126	for i in 1 2 3
127	do
128		ip -netns ${h[0]}    ro add 172.16.10${i}.0/24 nhid 4
129		ip -netns ${h[$i]} ro add 172.16.100.0/24 via 172.16.10${i}.254
130
131		ip -netns ${h[0]}    -6 ro add 2001:db8:10${i}::/64 nhid 6
132		ip -netns ${h[$i]} -6 ro add 2001:db8:100::/64 via 2001:db8:10${i}::64
133	done
134
135	if [ "$VERBOSE" = "1" ]; then
136		echo
137		echo "host 1 config"
138		ip -netns ${h[0]} li sh
139		ip -netns ${h[0]} ro sh
140		ip -netns ${h[0]} -6 ro sh
141	fi
142
143	#set +e
144}
145
146cleanup()
147{
148	cleanup_all_ns
149}
150
151change_mtu()
152{
153	local hostid=$1
154	local mtu=$2
155
156	run_cmd ip -netns h${hostid} li set eth0 mtu ${mtu}
157	run_cmd ip -netns ${r1} li set eth${hostid} mtu ${mtu}
158}
159
160################################################################################
161# validate exceptions
162
163validate_v4_exception()
164{
165	local i=$1
166	local mtu=$2
167	local ping_sz=$3
168	local dst="172.16.10${i}.1"
169	local h0_ip=172.16.100.1
170	local r1_ip=172.16.100.254
171	local rc
172
173	if [ ${ping_sz} != "0" ]; then
174		run_cmd ip netns exec ${h0} ping -s ${ping_sz} -c5 -w5 ${dst}
175	fi
176
177	if [ "$VERBOSE" = "1" ]; then
178		echo "Route get"
179		ip -netns ${h0} ro get ${dst}
180		echo "Searching for:"
181		echo "    cache .* mtu ${mtu}"
182		echo
183	fi
184
185	ip -netns ${h0} ro get ${dst} | \
186	grep -q "cache .* mtu ${mtu}"
187	rc=$?
188
189	log_test $rc 0 "IPv4: host 0 to host ${i}, mtu ${mtu}"
190}
191
192validate_v6_exception()
193{
194	local i=$1
195	local mtu=$2
196	local ping_sz=$3
197	local dst="2001:db8:10${i}::1"
198	local h0_ip=2001:db8:100::1
199	local r1_ip=2001:db8:100::64
200	local rc
201
202	if [ ${ping_sz} != "0" ]; then
203		run_cmd ip netns exec ${h0} ${ping6} -s ${ping_sz} -c5 -w5 ${dst}
204	fi
205
206	if [ "$VERBOSE" = "1" ]; then
207		echo "Route get"
208		ip -netns ${h0} -6 ro get ${dst}
209		echo "Searching for:"
210		echo "    ${dst}.* via ${r1_ip} dev eth0 src ${h0_ip} .* mtu ${mtu}"
211		echo
212	fi
213
214	ip -netns ${h0} -6 ro get ${dst} | \
215	grep -q "${dst}.* via ${r1_ip} dev eth0 src ${h0_ip} .* mtu ${mtu}"
216	rc=$?
217
218	log_test $rc 0 "IPv6: host 0 to host ${i}, mtu ${mtu}"
219}
220
221################################################################################
222# main
223
224while getopts :pv o
225do
226	case $o in
227		p) PAUSE_ON_FAIL=yes;;
228		v) VERBOSE=1;;
229	esac
230done
231
232cleanup
233setup
234sleep 2
235
236cpus=$(cat  /sys/devices/system/cpu/online)
237cpus="$(seq ${cpus/-/ })"
238ret=0
239for i in 1 2 3
240do
241	# generate a cached route per-cpu
242	for c in ${cpus}; do
243		run_cmd taskset -c ${c} ip netns exec ${h0} ping -c1 -w1 172.16.10${i}.1
244		[ $? -ne 0 ] && printf "\nERROR: ping to ${h[$i]} failed\n" && ret=1
245
246		run_cmd taskset -c ${c} ip netns exec ${h0} ${ping6} -c1 -w1 2001:db8:10${i}::1
247		[ $? -ne 0 ] && printf "\nERROR: ping6 to ${h[$i]} failed\n" && ret=1
248
249		[ $ret -ne 0 ] && break
250	done
251	[ $ret -ne 0 ] && break
252done
253
254if [ $ret -eq 0 ]; then
255	# generate different exceptions in h0 for h1, h2 and h3
256	change_mtu 1 1300
257	validate_v4_exception 1 1300 1350
258	validate_v6_exception 1 1300 1350
259	echo
260
261	change_mtu 2 1350
262	validate_v4_exception 2 1350 1400
263	validate_v6_exception 2 1350 1400
264	echo
265
266	change_mtu 3 1400
267	validate_v4_exception 3 1400 1450
268	validate_v6_exception 3 1400 1450
269	echo
270
271	validate_v4_exception 1 1300 0
272	validate_v6_exception 1 1300 0
273	echo
274
275	validate_v4_exception 2 1350 0
276	validate_v6_exception 2 1350 0
277	echo
278
279	validate_v4_exception 3 1400 0
280	validate_v6_exception 3 1400 0
281
282	# targeted deletes to trigger cleanup paths in kernel
283	ip -netns ${h0} ro del 172.16.102.0/24 nhid 4
284	ip -netns ${h0} -6 ro del 2001:db8:102::/64 nhid 6
285
286	ip -netns ${h0} nexthop del id 4
287	ip -netns ${h0} nexthop del id 6
288fi
289
290cleanup