lwt_dst_cache_ref_loop.sh

  1#!/bin/bash
  2# SPDX-License-Identifier: GPL-2.0+
  3#
  4# Author: Justin Iurman <justin.iurman@uliege.be>
  5#
  6# WARNING
  7# -------
  8# This is just a dummy script that triggers encap cases with possible dst cache
  9# reference loops in affected lwt users (see list below). Some cases are
 10# pathological configurations for simplicity, others are valid. Overall, we
 11# don't want this issue to happen, no matter what. In order to catch any
 12# reference loops, kmemleak MUST be used. The results alone are always blindly
 13# successful, don't rely on them. Note that the following tests may crash the
 14# kernel if the fix to prevent lwtunnel_{input|output|xmit}() reentry loops is
 15# not present.
 16#
 17# Affected lwt users so far (please update accordingly if needed):
 18#  - ila_lwt (output only)
 19#  - ioam6_iptunnel (output only)
 20#  - rpl_iptunnel (both input and output)
 21#  - seg6_iptunnel (both input and output)
 22
 23source lib.sh
 24
 25check_compatibility()
 26{
 27	setup_ns tmp_node &>/dev/null
 28	if [ $? != 0 ]; then
 29		echo "SKIP: Cannot create netns."
 30		exit $ksft_skip
 31	fi
 32
 33	ip link add name veth0 netns $tmp_node type veth \
 34		peer name veth1 netns $tmp_node &>/dev/null
 35	local ret=$?
 36
 37	ip -netns $tmp_node link set veth0 up &>/dev/null
 38	ret=$((ret + $?))
 39
 40	ip -netns $tmp_node link set veth1 up &>/dev/null
 41	ret=$((ret + $?))
 42
 43	if [ $ret != 0 ]; then
 44		echo "SKIP: Cannot configure links."
 45		cleanup_ns $tmp_node
 46		exit $ksft_skip
 47	fi
 48
 49	lsmod 2>/dev/null | grep -q "ila"
 50	ila_lsmod=$?
 51	[ $ila_lsmod != 0 ] && modprobe ila &>/dev/null
 52
 53	ip -netns $tmp_node route add 2001:db8:1::/64 \
 54		encap ila 1:2:3:4 csum-mode no-action ident-type luid \
 55			hook-type output \
 56		dev veth0 &>/dev/null
 57
 58	ip -netns $tmp_node route add 2001:db8:2::/64 \
 59		encap ioam6 trace prealloc type 0x800000 ns 0 size 4 \
 60		dev veth0 &>/dev/null
 61
 62	ip -netns $tmp_node route add 2001:db8:3::/64 \
 63		encap rpl segs 2001:db8:3::1 dev veth0 &>/dev/null
 64
 65	ip -netns $tmp_node route add 2001:db8:4::/64 \
 66		encap seg6 mode inline segs 2001:db8:4::1 dev veth0 &>/dev/null
 67
 68	ip -netns $tmp_node -6 route 2>/dev/null | grep -q "encap ila"
 69	skip_ila=$?
 70
 71	ip -netns $tmp_node -6 route 2>/dev/null | grep -q "encap ioam6"
 72	skip_ioam6=$?
 73
 74	ip -netns $tmp_node -6 route 2>/dev/null | grep -q "encap rpl"
 75	skip_rpl=$?
 76
 77	ip -netns $tmp_node -6 route 2>/dev/null | grep -q "encap seg6"
 78	skip_seg6=$?
 79
 80	cleanup_ns $tmp_node
 81}
 82
 83setup()
 84{
 85	setup_ns alpha beta gamma &>/dev/null
 86
 87	ip link add name veth-alpha netns $alpha type veth \
 88		peer name veth-betaL netns $beta &>/dev/null
 89
 90	ip link add name veth-betaR netns $beta type veth \
 91		peer name veth-gamma netns $gamma &>/dev/null
 92
 93	ip -netns $alpha link set veth-alpha name veth0 &>/dev/null
 94	ip -netns $beta link set veth-betaL name veth0 &>/dev/null
 95	ip -netns $beta link set veth-betaR name veth1 &>/dev/null
 96	ip -netns $gamma link set veth-gamma name veth0 &>/dev/null
 97
 98	ip -netns $alpha addr add 2001:db8:1::2/64 dev veth0 &>/dev/null
 99	ip -netns $alpha link set veth0 up &>/dev/null
100	ip -netns $alpha link set lo up &>/dev/null
101	ip -netns $alpha route add 2001:db8:2::/64 \
102		via 2001:db8:1::1 dev veth0 &>/dev/null
103
104	ip -netns $beta addr add 2001:db8:1::1/64 dev veth0 &>/dev/null
105	ip -netns $beta addr add 2001:db8:2::1/64 dev veth1 &>/dev/null
106	ip -netns $beta link set veth0 up &>/dev/null
107	ip -netns $beta link set veth1 up &>/dev/null
108	ip -netns $beta link set lo up &>/dev/null
109	ip -netns $beta route del 2001:db8:2::/64
110	ip -netns $beta route add 2001:db8:2::/64 dev veth1
111	ip netns exec $beta \
112		sysctl -wq net.ipv6.conf.all.forwarding=1 &>/dev/null
113
114	ip -netns $gamma addr add 2001:db8:2::2/64 dev veth0 &>/dev/null
115	ip -netns $gamma link set veth0 up &>/dev/null
116	ip -netns $gamma link set lo up &>/dev/null
117	ip -netns $gamma route add 2001:db8:1::/64 \
118		via 2001:db8:2::1 dev veth0 &>/dev/null
119
120	sleep 1
121
122	ip netns exec $alpha ping6 -c 5 -W 1 2001:db8:2::2 &>/dev/null
123	if [ $? != 0 ]; then
124		echo "SKIP: Setup failed."
125		exit $ksft_skip
126	fi
127
128	sleep 1
129}
130
131cleanup()
132{
133	cleanup_ns $alpha $beta $gamma
134	[ $ila_lsmod != 0 ] && modprobe -r ila &>/dev/null
135}
136
137run_ila()
138{
139	if [ $skip_ila != 0 ]; then
140		echo "SKIP: ila (output)"
141		return
142	fi
143
144	ip -netns $beta route del 2001:db8:2::/64
145	ip -netns $beta route add 2001:db8:2:0:0:0:0:2/128 \
146		encap ila 2001:db8:2:0 csum-mode no-action ident-type luid \
147			hook-type output \
148		dev veth1 &>/dev/null
149	sleep 1
150
151	echo "TEST: ila (output)"
152	ip netns exec $beta ping6 -c 2 -W 1 2001:db8:2::2 &>/dev/null
153	sleep 1
154
155	ip -netns $beta route del 2001:db8:2:0:0:0:0:2/128
156	ip -netns $beta route add 2001:db8:2::/64 dev veth1
157	sleep 1
158}
159
160run_ioam6()
161{
162	if [ $skip_ioam6 != 0 ]; then
163		echo "SKIP: ioam6 (output)"
164		return
165	fi
166
167	ip -netns $beta route change 2001:db8:2::/64 \
168		encap ioam6 trace prealloc type 0x800000 ns 1 size 4 \
169		dev veth1 &>/dev/null
170	sleep 1
171
172	echo "TEST: ioam6 (output)"
173	ip netns exec $beta ping6 -c 2 -W 1 2001:db8:2::2 &>/dev/null
174	sleep 1
175}
176
177run_rpl()
178{
179	if [ $skip_rpl != 0 ]; then
180		echo "SKIP: rpl (input)"
181		echo "SKIP: rpl (output)"
182		return
183	fi
184
185	ip -netns $beta route change 2001:db8:2::/64 \
186		encap rpl segs 2001:db8:2::2 \
187		dev veth1 &>/dev/null
188	sleep 1
189
190	echo "TEST: rpl (input)"
191	ip netns exec $alpha ping6 -c 2 -W 1 2001:db8:2::2 &>/dev/null
192	sleep 1
193
194	echo "TEST: rpl (output)"
195	ip netns exec $beta ping6 -c 2 -W 1 2001:db8:2::2 &>/dev/null
196	sleep 1
197}
198
199run_seg6()
200{
201	if [ $skip_seg6 != 0 ]; then
202		echo "SKIP: seg6 (input)"
203		echo "SKIP: seg6 (output)"
204		return
205	fi
206
207	ip -netns $beta route change 2001:db8:2::/64 \
208		encap seg6 mode inline segs 2001:db8:2::2 \
209		dev veth1 &>/dev/null
210	sleep 1
211
212	echo "TEST: seg6 (input)"
213	ip netns exec $alpha ping6 -c 2 -W 1 2001:db8:2::2 &>/dev/null
214	sleep 1
215
216	echo "TEST: seg6 (output)"
217	ip netns exec $beta ping6 -c 2 -W 1 2001:db8:2::2 &>/dev/null
218	sleep 1
219}
220
221run()
222{
223	run_ila
224	run_ioam6
225	run_rpl
226	run_seg6
227}
228
229if [ "$(id -u)" -ne 0 ]; then
230	echo "SKIP: Need root privileges."
231	exit $ksft_skip
232fi
233
234if [ ! -x "$(command -v ip)" ]; then
235	echo "SKIP: Could not run test without ip tool."
236	exit $ksft_skip
237fi
238
239check_compatibility
240
241trap cleanup EXIT
242
243setup
244run
245
246exit $ksft_pass