tools/testing/selftests/net/traceroute.sh

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