tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1#!/bin/bash
2# SPDX-License-Identifier: GPL-2.0
3
4# This test is for the accept_untracked_na feature to
5# enable RFC9131 behaviour. The following is the test-matrix.
6# drop accept fwding behaviour
7# ---- ------ ------ ----------------------------------------------
8# 1 X X Don't update NC
9# 0 0 X Don't update NC
10# 0 1 0 Don't update NC
11# 0 1 1 Add a STALE NC entry
12
13ret=0
14# Kselftest framework requirement - SKIP code is 4.
15ksft_skip=4
16
17PAUSE_ON_FAIL=no
18PAUSE=no
19
20HOST_NS="ns-host"
21ROUTER_NS="ns-router"
22
23HOST_INTF="veth-host"
24ROUTER_INTF="veth-router"
25
26ROUTER_ADDR="2000:20::1"
27HOST_ADDR="2000:20::2"
28SUBNET_WIDTH=64
29ROUTER_ADDR_WITH_MASK="${ROUTER_ADDR}/${SUBNET_WIDTH}"
30HOST_ADDR_WITH_MASK="${HOST_ADDR}/${SUBNET_WIDTH}"
31
32IP_HOST="ip -6 -netns ${HOST_NS}"
33IP_HOST_EXEC="ip netns exec ${HOST_NS}"
34IP_ROUTER="ip -6 -netns ${ROUTER_NS}"
35IP_ROUTER_EXEC="ip netns exec ${ROUTER_NS}"
36
37tcpdump_stdout=
38tcpdump_stderr=
39
40log_test()
41{
42 local rc=$1
43 local expected=$2
44 local msg="$3"
45
46 if [ ${rc} -eq ${expected} ]; then
47 printf " TEST: %-60s [ OK ]\n" "${msg}"
48 nsuccess=$((nsuccess+1))
49 else
50 ret=1
51 nfail=$((nfail+1))
52 printf " TEST: %-60s [FAIL]\n" "${msg}"
53 if [ "${PAUSE_ON_FAIL}" = "yes" ]; then
54 echo
55 echo "hit enter to continue, 'q' to quit"
56 read a
57 [ "$a" = "q" ] && exit 1
58 fi
59 fi
60
61 if [ "${PAUSE}" = "yes" ]; then
62 echo
63 echo "hit enter to continue, 'q' to quit"
64 read a
65 [ "$a" = "q" ] && exit 1
66 fi
67}
68
69setup()
70{
71 set -e
72
73 local drop_unsolicited_na=$1
74 local accept_untracked_na=$2
75 local forwarding=$3
76
77 # Setup two namespaces and a veth tunnel across them.
78 # On end of the tunnel is a router and the other end is a host.
79 ip netns add ${HOST_NS}
80 ip netns add ${ROUTER_NS}
81 ${IP_ROUTER} link add ${ROUTER_INTF} type veth \
82 peer name ${HOST_INTF} netns ${HOST_NS}
83
84 # Enable IPv6 on both router and host, and configure static addresses.
85 # The router here is the DUT
86 # Setup router configuration as specified by the arguments.
87 # forwarding=0 case is to check that a non-router
88 # doesn't add neighbour entries.
89 ROUTER_CONF=net.ipv6.conf.${ROUTER_INTF}
90 ${IP_ROUTER_EXEC} sysctl -qw \
91 ${ROUTER_CONF}.forwarding=${forwarding}
92 ${IP_ROUTER_EXEC} sysctl -qw \
93 ${ROUTER_CONF}.drop_unsolicited_na=${drop_unsolicited_na}
94 ${IP_ROUTER_EXEC} sysctl -qw \
95 ${ROUTER_CONF}.accept_untracked_na=${accept_untracked_na}
96 ${IP_ROUTER_EXEC} sysctl -qw ${ROUTER_CONF}.disable_ipv6=0
97 ${IP_ROUTER} addr add ${ROUTER_ADDR_WITH_MASK} dev ${ROUTER_INTF}
98
99 # Turn on ndisc_notify on host interface so that
100 # the host sends unsolicited NAs.
101 HOST_CONF=net.ipv6.conf.${HOST_INTF}
102 ${IP_HOST_EXEC} sysctl -qw ${HOST_CONF}.ndisc_notify=1
103 ${IP_HOST_EXEC} sysctl -qw ${HOST_CONF}.disable_ipv6=0
104 ${IP_HOST} addr add ${HOST_ADDR_WITH_MASK} dev ${HOST_INTF}
105
106 set +e
107}
108
109start_tcpdump() {
110 set -e
111 tcpdump_stdout=`mktemp`
112 tcpdump_stderr=`mktemp`
113 ${IP_ROUTER_EXEC} timeout 15s \
114 tcpdump --immediate-mode -tpni ${ROUTER_INTF} -c 1 \
115 "icmp6 && icmp6[0] == 136 && src ${HOST_ADDR}" \
116 > ${tcpdump_stdout} 2> /dev/null
117 set +e
118}
119
120cleanup_tcpdump()
121{
122 set -e
123 [[ ! -z ${tcpdump_stdout} ]] && rm -f ${tcpdump_stdout}
124 [[ ! -z ${tcpdump_stderr} ]] && rm -f ${tcpdump_stderr}
125 tcpdump_stdout=
126 tcpdump_stderr=
127 set +e
128}
129
130cleanup()
131{
132 cleanup_tcpdump
133 ip netns del ${HOST_NS}
134 ip netns del ${ROUTER_NS}
135}
136
137link_up() {
138 set -e
139 ${IP_ROUTER} link set dev ${ROUTER_INTF} up
140 ${IP_HOST} link set dev ${HOST_INTF} up
141 set +e
142}
143
144verify_ndisc() {
145 local drop_unsolicited_na=$1
146 local accept_untracked_na=$2
147 local forwarding=$3
148
149 neigh_show_output=$(${IP_ROUTER} neigh show \
150 to ${HOST_ADDR} dev ${ROUTER_INTF} nud stale)
151 if [ ${drop_unsolicited_na} -eq 0 ] && \
152 [ ${accept_untracked_na} -eq 1 ] && \
153 [ ${forwarding} -eq 1 ]; then
154 # Neighbour entry expected to be present for 011 case
155 [[ ${neigh_show_output} ]]
156 else
157 # Neighbour entry expected to be absent for all other cases
158 [[ -z ${neigh_show_output} ]]
159 fi
160}
161
162test_unsolicited_na_common()
163{
164 # Setup the test bed, but keep links down
165 setup $1 $2 $3
166
167 # Bring the link up, wait for the NA,
168 # and add a delay to ensure neighbour processing is done.
169 link_up
170 start_tcpdump
171
172 # Verify the neighbour table
173 verify_ndisc $1 $2 $3
174
175}
176
177test_unsolicited_na_combination() {
178 test_unsolicited_na_common $1 $2 $3
179 test_msg=("test_unsolicited_na: "
180 "drop_unsolicited_na=$1 "
181 "accept_untracked_na=$2 "
182 "forwarding=$3")
183 log_test $? 0 "${test_msg[*]}"
184 cleanup
185}
186
187test_unsolicited_na_combinations() {
188 # Args: drop_unsolicited_na accept_untracked_na forwarding
189
190 # Expect entry
191 test_unsolicited_na_combination 0 1 1
192
193 # Expect no entry
194 test_unsolicited_na_combination 0 0 0
195 test_unsolicited_na_combination 0 0 1
196 test_unsolicited_na_combination 0 1 0
197 test_unsolicited_na_combination 1 0 0
198 test_unsolicited_na_combination 1 0 1
199 test_unsolicited_na_combination 1 1 0
200 test_unsolicited_na_combination 1 1 1
201}
202
203###############################################################################
204# usage
205
206usage()
207{
208 cat <<EOF
209usage: ${0##*/} OPTS
210 -p Pause on fail
211 -P Pause after each test before cleanup
212EOF
213}
214
215###############################################################################
216# main
217
218while getopts :pPh o
219do
220 case $o in
221 p) PAUSE_ON_FAIL=yes;;
222 P) PAUSE=yes;;
223 h) usage; exit 0;;
224 *) usage; exit 1;;
225 esac
226done
227
228# make sure we don't pause twice
229[ "${PAUSE}" = "yes" ] && PAUSE_ON_FAIL=no
230
231if [ "$(id -u)" -ne 0 ];then
232 echo "SKIP: Need root privileges"
233 exit $ksft_skip;
234fi
235
236if [ ! -x "$(command -v ip)" ]; then
237 echo "SKIP: Could not run test without ip tool"
238 exit $ksft_skip
239fi
240
241if [ ! -x "$(command -v tcpdump)" ]; then
242 echo "SKIP: Could not run test without tcpdump tool"
243 exit $ksft_skip
244fi
245
246# start clean
247cleanup &> /dev/null
248
249test_unsolicited_na_combinations
250
251printf "\nTests passed: %3d\n" ${nsuccess}
252printf "Tests failed: %3d\n" ${nfail}
253
254exit $ret