1#!/bin/bash 2# SPDX-License-Identifier: GPL-2.0 3# 4# 2 namespaces: one host and one router. Use arping from the host to send a 5# garp to the router. Router accepts or ignores based on its arp_accept 6# or accept_untracked_na configuration. 7 8TESTS="arp ndisc" 9 10ROUTER_NS="ns-router" 11ROUTER_NS_V6="ns-router-v6" 12ROUTER_INTF="veth-router" 13ROUTER_ADDR="10.0.10.1" 14ROUTER_ADDR_V6="2001:db8:abcd:0012::1" 15 16HOST_NS="ns-host" 17HOST_NS_V6="ns-host-v6" 18HOST_INTF="veth-host" 19HOST_ADDR="10.0.10.2" 20HOST_ADDR_V6="2001:db8:abcd:0012::2" 21 22SUBNET_WIDTH=24 23PREFIX_WIDTH_V6=64 24 25cleanup() { 26 ip netns del ${HOST_NS} 27 ip netns del ${ROUTER_NS} 28} 29 30cleanup_v6() { 31 ip netns del ${HOST_NS_V6} 32 ip netns del ${ROUTER_NS_V6} 33} 34 35setup() { 36 set -e 37 local arp_accept=$1 38 39 # Set up two namespaces 40 ip netns add ${ROUTER_NS} 41 ip netns add ${HOST_NS} 42 43 # Set up interfaces veth0 and veth1, which are pairs in separate 44 # namespaces. veth0 is veth-router, veth1 is veth-host. 45 # first, set up the inteface's link to the namespace 46 # then, set the interface "up" 47 ip netns exec ${ROUTER_NS} ip link add name ${ROUTER_INTF} \ 48 type veth peer name ${HOST_INTF} 49 50 ip netns exec ${ROUTER_NS} ip link set dev ${ROUTER_INTF} up 51 ip netns exec ${ROUTER_NS} ip link set dev ${HOST_INTF} netns ${HOST_NS} 52 53 ip netns exec ${HOST_NS} ip link set dev ${HOST_INTF} up 54 ip netns exec ${ROUTER_NS} ip addr add ${ROUTER_ADDR}/${SUBNET_WIDTH} \ 55 dev ${ROUTER_INTF} 56 57 ip netns exec ${HOST_NS} ip addr add ${HOST_ADDR}/${SUBNET_WIDTH} \ 58 dev ${HOST_INTF} 59 ip netns exec ${HOST_NS} ip route add default via ${HOST_ADDR} \ 60 dev ${HOST_INTF} 61 ip netns exec ${ROUTER_NS} ip route add default via ${ROUTER_ADDR} \ 62 dev ${ROUTER_INTF} 63 64 ROUTER_CONF=net.ipv4.conf.${ROUTER_INTF} 65 ip netns exec ${ROUTER_NS} sysctl -w \ 66 ${ROUTER_CONF}.arp_accept=${arp_accept} >/dev/null 2>&1 67 set +e 68} 69 70setup_v6() { 71 set -e 72 local accept_untracked_na=$1 73 74 # Set up two namespaces 75 ip netns add ${ROUTER_NS_V6} 76 ip netns add ${HOST_NS_V6} 77 78 # Set up interfaces veth0 and veth1, which are pairs in separate 79 # namespaces. veth0 is veth-router, veth1 is veth-host. 80 # first, set up the inteface's link to the namespace 81 # then, set the interface "up" 82 ip -6 -netns ${ROUTER_NS_V6} link add name ${ROUTER_INTF} \ 83 type veth peer name ${HOST_INTF} 84 85 ip -6 -netns ${ROUTER_NS_V6} link set dev ${ROUTER_INTF} up 86 ip -6 -netns ${ROUTER_NS_V6} link set dev ${HOST_INTF} netns \ 87 ${HOST_NS_V6} 88 89 ip -6 -netns ${HOST_NS_V6} link set dev ${HOST_INTF} up 90 ip -6 -netns ${ROUTER_NS_V6} addr add \ 91 ${ROUTER_ADDR_V6}/${PREFIX_WIDTH_V6} dev ${ROUTER_INTF} nodad 92 93 HOST_CONF=net.ipv6.conf.${HOST_INTF} 94 ip netns exec ${HOST_NS_V6} sysctl -qw ${HOST_CONF}.ndisc_notify=1 95 ip netns exec ${HOST_NS_V6} sysctl -qw ${HOST_CONF}.disable_ipv6=0 96 ip -6 -netns ${HOST_NS_V6} addr add ${HOST_ADDR_V6}/${PREFIX_WIDTH_V6} \ 97 dev ${HOST_INTF} 98 99 ROUTER_CONF=net.ipv6.conf.${ROUTER_INTF} 100 101 ip netns exec ${ROUTER_NS_V6} sysctl -w \ 102 ${ROUTER_CONF}.forwarding=1 >/dev/null 2>&1 103 ip netns exec ${ROUTER_NS_V6} sysctl -w \ 104 ${ROUTER_CONF}.drop_unsolicited_na=0 >/dev/null 2>&1 105 ip netns exec ${ROUTER_NS_V6} sysctl -w \ 106 ${ROUTER_CONF}.accept_untracked_na=${accept_untracked_na} \ 107 >/dev/null 2>&1 108 set +e 109} 110 111verify_arp() { 112 local arp_accept=$1 113 local same_subnet=$2 114 115 neigh_show_output=$(ip netns exec ${ROUTER_NS} ip neigh get \ 116 ${HOST_ADDR} dev ${ROUTER_INTF} 2>/dev/null) 117 118 if [ ${arp_accept} -eq 1 ]; then 119 # Neighbor entries expected 120 [[ ${neigh_show_output} ]] 121 elif [ ${arp_accept} -eq 2 ]; then 122 if [ ${same_subnet} -eq 1 ]; then 123 # Neighbor entries expected 124 [[ ${neigh_show_output} ]] 125 else 126 [[ -z "${neigh_show_output}" ]] 127 fi 128 else 129 [[ -z "${neigh_show_output}" ]] 130 fi 131 } 132 133arp_test_gratuitous() { 134 set -e 135 local arp_accept=$1 136 local same_subnet=$2 137 138 if [ ${arp_accept} -eq 2 ]; then 139 test_msg=("test_arp: " 140 "accept_arp=$1 " 141 "same_subnet=$2") 142 if [ ${same_subnet} -eq 0 ]; then 143 HOST_ADDR=10.0.11.3 144 else 145 HOST_ADDR=10.0.10.3 146 fi 147 else 148 test_msg=("test_arp: " 149 "accept_arp=$1") 150 fi 151 # Supply arp_accept option to set up which sets it in sysctl 152 setup ${arp_accept} 153 ip netns exec ${HOST_NS} arping -A -I ${HOST_INTF} -U ${HOST_ADDR} -c1 2>&1 >/dev/null 154 155 if verify_arp $1 $2; then 156 printf " TEST: %-60s [ OK ]\n" "${test_msg[*]}" 157 else 158 printf " TEST: %-60s [FAIL]\n" "${test_msg[*]}" 159 fi 160 cleanup 161 set +e 162} 163 164arp_test_gratuitous_combinations() { 165 arp_test_gratuitous 0 166 arp_test_gratuitous 1 167 arp_test_gratuitous 2 0 # Second entry indicates subnet or not 168 arp_test_gratuitous 2 1 169} 170 171cleanup_tcpdump() { 172 set -e 173 [[ ! -z ${tcpdump_stdout} ]] && rm -f ${tcpdump_stdout} 174 [[ ! -z ${tcpdump_stderr} ]] && rm -f ${tcpdump_stderr} 175 tcpdump_stdout= 176 tcpdump_stderr= 177 set +e 178} 179 180start_tcpdump() { 181 set -e 182 tcpdump_stdout=`mktemp` 183 tcpdump_stderr=`mktemp` 184 ip netns exec ${ROUTER_NS_V6} timeout 15s \ 185 tcpdump --immediate-mode -tpni ${ROUTER_INTF} -c 1 \ 186 "icmp6 && icmp6[0] == 136 && src ${HOST_ADDR_V6}" \ 187 > ${tcpdump_stdout} 2> /dev/null 188 set +e 189} 190 191verify_ndisc() { 192 local accept_untracked_na=$1 193 local same_subnet=$2 194 195 neigh_show_output=$(ip -6 -netns ${ROUTER_NS_V6} neigh show \ 196 to ${HOST_ADDR_V6} dev ${ROUTER_INTF} nud stale) 197 198 if [ ${accept_untracked_na} -eq 1 ]; then 199 # Neighbour entry expected to be present 200 [[ ${neigh_show_output} ]] 201 elif [ ${accept_untracked_na} -eq 2 ]; then 202 if [ ${same_subnet} -eq 1 ]; then 203 [[ ${neigh_show_output} ]] 204 else 205 [[ -z "${neigh_show_output}" ]] 206 fi 207 else 208 # Neighbour entry expected to be absent for all other cases 209 [[ -z "${neigh_show_output}" ]] 210 fi 211} 212 213ndisc_test_untracked_advertisements() { 214 set -e 215 test_msg=("test_ndisc: " 216 "accept_untracked_na=$1") 217 218 local accept_untracked_na=$1 219 local same_subnet=$2 220 if [ ${accept_untracked_na} -eq 2 ]; then 221 test_msg=("test_ndisc: " 222 "accept_untracked_na=$1 " 223 "same_subnet=$2") 224 if [ ${same_subnet} -eq 0 ]; then 225 # Not same subnet 226 HOST_ADDR_V6=2000:db8:abcd:0013::4 227 else 228 HOST_ADDR_V6=2001:db8:abcd:0012::3 229 fi 230 fi 231 setup_v6 $1 $2 232 start_tcpdump 233 234 if verify_ndisc $1 $2; then 235 printf " TEST: %-60s [ OK ]\n" "${test_msg[*]}" 236 else 237 printf " TEST: %-60s [FAIL]\n" "${test_msg[*]}" 238 fi 239 240 cleanup_tcpdump 241 cleanup_v6 242 set +e 243} 244 245ndisc_test_untracked_combinations() { 246 ndisc_test_untracked_advertisements 0 247 ndisc_test_untracked_advertisements 1 248 ndisc_test_untracked_advertisements 2 0 249 ndisc_test_untracked_advertisements 2 1 250} 251 252################################################################################ 253# usage 254 255usage() 256{ 257 cat <<EOF 258usage: ${0##*/} OPTS 259 260 -t <test> Test(s) to run (default: all) 261 (options: $TESTS) 262EOF 263} 264 265################################################################################ 266# main 267 268while getopts ":t:h" opt; do 269 case $opt in 270 t) TESTS=$OPTARG;; 271 h) usage; exit 0;; 272 *) usage; exit 1;; 273 esac 274done 275 276if [ "$(id -u)" -ne 0 ];then 277 echo "SKIP: Need root privileges" 278 exit $ksft_skip; 279fi 280 281if [ ! -x "$(command -v ip)" ]; then 282 echo "SKIP: Could not run test without ip tool" 283 exit $ksft_skip 284fi 285 286if [ ! -x "$(command -v tcpdump)" ]; then 287 echo "SKIP: Could not run test without tcpdump tool" 288 exit $ksft_skip 289fi 290 291if [ ! -x "$(command -v arping)" ]; then 292 echo "SKIP: Could not run test without arping tool" 293 exit $ksft_skip 294fi 295 296# start clean 297cleanup &> /dev/null 298cleanup_v6 &> /dev/null 299 300for t in $TESTS 301do 302 case $t in 303 arp_test_gratuitous_combinations|arp) arp_test_gratuitous_combinations;; 304 ndisc_test_untracked_combinations|ndisc) \ 305 ndisc_test_untracked_combinations;; 306 help) echo "Test names: $TESTS"; exit 0;; 307esac 308done 309