1#!/bin/bash 2# SPDX-License-Identifier: GPL-2.0 3# 4# redirect test 5# 6# .253 +----+ 7# +----| r1 | 8# | +----+ 9# +----+ | |.1 10# | h1 |--------------+ | 10.1.1.0/30 2001:db8:1::0/126 11# +----+ .1 | |.2 12# 172.16.1/24 | +----+ +----+ 13# 2001:db8:16:1/64 +----| r2 |-------------------| h2 | 14# .254 +----+ .254 .2 +----+ 15# 172.16.2/24 16# 2001:db8:16:2/64 17# 18# Route from h1 to h2 goes through r1, eth1 - connection between r1 and r2. 19# Route on r1 changed to go to r2 via eth0. This causes a redirect to be sent 20# from r1 to h1 telling h1 to use r2 when talking to h2. 21 22VERBOSE=0 23PAUSE_ON_FAIL=no 24 25H1_N1_IP=172.16.1.1 26R1_N1_IP=172.16.1.253 27R2_N1_IP=172.16.1.254 28 29H1_N1_IP6=2001:db8:16:1::1 30R1_N1_IP6=2001:db8:16:1::253 31R2_N1_IP6=2001:db8:16:1::254 32 33R1_R2_N1_IP=10.1.1.1 34R2_R1_N1_IP=10.1.1.2 35 36R1_R2_N1_IP6=2001:db8:1::1 37R2_R1_N1_IP6=2001:db8:1::2 38 39H2_N2=172.16.2.0/24 40H2_N2_6=2001:db8:16:2::/64 41H2_N2_IP=172.16.2.2 42R2_N2_IP=172.16.2.254 43H2_N2_IP6=2001:db8:16:2::2 44R2_N2_IP6=2001:db8:16:2::254 45 46VRF=red 47VRF_TABLE=1111 48 49################################################################################ 50# helpers 51 52log_section() 53{ 54 echo 55 echo "###########################################################################" 56 echo "$*" 57 echo "###########################################################################" 58 echo 59} 60 61log_test() 62{ 63 local rc=$1 64 local expected=$2 65 local msg="$3" 66 67 if [ ${rc} -eq ${expected} ]; then 68 printf "TEST: %-60s [ OK ]\n" "${msg}" 69 nsuccess=$((nsuccess+1)) 70 else 71 ret=1 72 nfail=$((nfail+1)) 73 printf "TEST: %-60s [FAIL]\n" "${msg}" 74 if [ "${PAUSE_ON_FAIL}" = "yes" ]; then 75 echo 76 echo "hit enter to continue, 'q' to quit" 77 read a 78 [ "$a" = "q" ] && exit 1 79 fi 80 fi 81} 82 83log_debug() 84{ 85 if [ "$VERBOSE" = "1" ]; then 86 echo "$*" 87 fi 88} 89 90run_cmd() 91{ 92 local cmd="$*" 93 local out 94 local rc 95 96 if [ "$VERBOSE" = "1" ]; then 97 echo "COMMAND: $cmd" 98 fi 99 100 out=$(eval $cmd 2>&1) 101 rc=$? 102 if [ "$VERBOSE" = "1" -a -n "$out" ]; then 103 echo "$out" 104 fi 105 106 [ "$VERBOSE" = "1" ] && echo 107 108 return $rc 109} 110 111get_linklocal() 112{ 113 local ns=$1 114 local dev=$2 115 local addr 116 117 addr=$(ip -netns $ns -6 -br addr show dev ${dev} | \ 118 awk '{ 119 for (i = 3; i <= NF; ++i) { 120 if ($i ~ /^fe80/) 121 print $i 122 } 123 }' 124 ) 125 addr=${addr/\/*} 126 127 [ -z "$addr" ] && return 1 128 129 echo $addr 130 131 return 0 132} 133 134################################################################################ 135# setup and teardown 136 137cleanup() 138{ 139 local ns 140 141 for ns in h1 h2 r1 r2; do 142 ip netns del $ns 2>/dev/null 143 done 144} 145 146create_vrf() 147{ 148 local ns=$1 149 150 ip -netns ${ns} link add ${VRF} type vrf table ${VRF_TABLE} 151 ip -netns ${ns} link set ${VRF} up 152 ip -netns ${ns} route add vrf ${VRF} unreachable default metric 8192 153 ip -netns ${ns} -6 route add vrf ${VRF} unreachable default metric 8192 154 155 ip -netns ${ns} addr add 127.0.0.1/8 dev ${VRF} 156 ip -netns ${ns} -6 addr add ::1 dev ${VRF} nodad 157 158 ip -netns ${ns} ru del pref 0 159 ip -netns ${ns} ru add pref 32765 from all lookup local 160 ip -netns ${ns} -6 ru del pref 0 161 ip -netns ${ns} -6 ru add pref 32765 from all lookup local 162} 163 164setup() 165{ 166 local ns 167 168 # 169 # create nodes as namespaces 170 # 171 for ns in h1 h2 r1 r2; do 172 ip netns add $ns 173 ip -netns $ns li set lo up 174 175 case "${ns}" in 176 h[12]) ip netns exec $ns sysctl -q -w net.ipv4.conf.all.accept_redirects=1 177 ip netns exec $ns sysctl -q -w net.ipv6.conf.all.forwarding=0 178 ip netns exec $ns sysctl -q -w net.ipv6.conf.all.accept_redirects=1 179 ip netns exec $ns sysctl -q -w net.ipv6.conf.all.keep_addr_on_down=1 180 ;; 181 r[12]) ip netns exec $ns sysctl -q -w net.ipv4.ip_forward=1 182 ip netns exec $ns sysctl -q -w net.ipv4.conf.all.send_redirects=1 183 184 ip netns exec $ns sysctl -q -w net.ipv6.conf.all.forwarding=1 185 ip netns exec $ns sysctl -q -w net.ipv6.route.mtu_expires=10 186 esac 187 done 188 189 # 190 # create interconnects 191 # 192 ip -netns h1 li add eth0 type veth peer name r1h1 193 ip -netns h1 li set r1h1 netns r1 name eth0 up 194 195 ip -netns h1 li add eth1 type veth peer name r2h1 196 ip -netns h1 li set r2h1 netns r2 name eth0 up 197 198 ip -netns h2 li add eth0 type veth peer name r2h2 199 ip -netns h2 li set eth0 up 200 ip -netns h2 li set r2h2 netns r2 name eth2 up 201 202 ip -netns r1 li add eth1 type veth peer name r2r1 203 ip -netns r1 li set eth1 up 204 ip -netns r1 li set r2r1 netns r2 name eth1 up 205 206 # 207 # h1 208 # 209 if [ "${WITH_VRF}" = "yes" ]; then 210 create_vrf "h1" 211 H1_VRF_ARG="vrf ${VRF}" 212 H1_PING_ARG="-I ${VRF}" 213 else 214 H1_VRF_ARG= 215 H1_PING_ARG= 216 fi 217 ip -netns h1 li add br0 type bridge 218 if [ "${WITH_VRF}" = "yes" ]; then 219 ip -netns h1 li set br0 vrf ${VRF} up 220 else 221 ip -netns h1 li set br0 up 222 fi 223 ip -netns h1 addr add dev br0 ${H1_N1_IP}/24 224 ip -netns h1 -6 addr add dev br0 ${H1_N1_IP6}/64 nodad 225 ip -netns h1 li set eth0 master br0 up 226 ip -netns h1 li set eth1 master br0 up 227 228 # 229 # h2 230 # 231 ip -netns h2 addr add dev eth0 ${H2_N2_IP}/24 232 ip -netns h2 ro add default via ${R2_N2_IP} dev eth0 233 ip -netns h2 -6 addr add dev eth0 ${H2_N2_IP6}/64 nodad 234 ip -netns h2 -6 ro add default via ${R2_N2_IP6} dev eth0 235 236 # 237 # r1 238 # 239 ip -netns r1 addr add dev eth0 ${R1_N1_IP}/24 240 ip -netns r1 -6 addr add dev eth0 ${R1_N1_IP6}/64 nodad 241 ip -netns r1 addr add dev eth1 ${R1_R2_N1_IP}/30 242 ip -netns r1 -6 addr add dev eth1 ${R1_R2_N1_IP6}/126 nodad 243 244 # 245 # r2 246 # 247 ip -netns r2 addr add dev eth0 ${R2_N1_IP}/24 248 ip -netns r2 -6 addr add dev eth0 ${R2_N1_IP6}/64 nodad 249 ip -netns r2 addr add dev eth1 ${R2_R1_N1_IP}/30 250 ip -netns r2 -6 addr add dev eth1 ${R2_R1_N1_IP6}/126 nodad 251 ip -netns r2 addr add dev eth2 ${R2_N2_IP}/24 252 ip -netns r2 -6 addr add dev eth2 ${R2_N2_IP6}/64 nodad 253 254 sleep 2 255 256 R1_LLADDR=$(get_linklocal r1 eth0) 257 if [ $? -ne 0 ]; then 258 echo "Error: Failed to get link-local address of r1's eth0" 259 exit 1 260 fi 261 log_debug "initial gateway is R1's lladdr = ${R1_LLADDR}" 262 263 R2_LLADDR=$(get_linklocal r2 eth0) 264 if [ $? -ne 0 ]; then 265 echo "Error: Failed to get link-local address of r2's eth0" 266 exit 1 267 fi 268 log_debug "initial gateway is R2's lladdr = ${R2_LLADDR}" 269} 270 271change_h2_mtu() 272{ 273 local mtu=$1 274 275 run_cmd ip -netns h2 li set eth0 mtu ${mtu} 276 run_cmd ip -netns r2 li set eth2 mtu ${mtu} 277} 278 279check_exception() 280{ 281 local mtu="$1" 282 local with_redirect="$2" 283 local desc="$3" 284 285 # From 172.16.1.101: icmp_seq=1 Redirect Host(New nexthop: 172.16.1.102) 286 if [ "$VERBOSE" = "1" ]; then 287 echo "Commands to check for exception:" 288 run_cmd ip -netns h1 ro get ${H1_VRF_ARG} ${H2_N2_IP} 289 run_cmd ip -netns h1 -6 ro get ${H1_VRF_ARG} ${H2_N2_IP6} 290 fi 291 292 if [ -n "${mtu}" ]; then 293 mtu=" mtu ${mtu}" 294 fi 295 if [ "$with_redirect" = "yes" ]; then 296 ip -netns h1 ro get ${H1_VRF_ARG} ${H2_N2_IP} | \ 297 grep -q "cache <redirected> expires [0-9]*sec${mtu}" 298 elif [ -n "${mtu}" ]; then 299 ip -netns h1 ro get ${H1_VRF_ARG} ${H2_N2_IP} | \ 300 grep -q "cache expires [0-9]*sec${mtu}" 301 else 302 # want to verify that neither mtu nor redirected appears in 303 # the route get output. The -v will wipe out the cache line 304 # if either are set so the last grep -q will not find a match 305 ip -netns h1 ro get ${H1_VRF_ARG} ${H2_N2_IP} | \ 306 grep -E -v 'mtu|redirected' | grep -q "cache" 307 fi 308 log_test $? 0 "IPv4: ${desc}" 309 310 if [ "$with_redirect" = "yes" ]; then 311 ip -netns h1 -6 ro get ${H1_VRF_ARG} ${H2_N2_IP6} | \ 312 grep -q "${H2_N2_IP6} from :: via ${R2_LLADDR} dev br0.*${mtu}" 313 elif [ -n "${mtu}" ]; then 314 ip -netns h1 -6 ro get ${H1_VRF_ARG} ${H2_N2_IP6} | \ 315 grep -q "${mtu}" 316 else 317 # IPv6 is a bit harder. First strip out the match if it 318 # contains an mtu exception and then look for the first 319 # gateway - R1's lladdr 320 ip -netns h1 -6 ro get ${H1_VRF_ARG} ${H2_N2_IP6} | \ 321 grep -v "mtu" | grep -q "${R1_LLADDR}" 322 fi 323 log_test $? 0 "IPv6: ${desc}" 324} 325 326run_ping() 327{ 328 local sz=$1 329 330 run_cmd ip netns exec h1 ping -q -M want -i 0.5 -c 10 -w 2 -s ${sz} ${H1_PING_ARG} ${H2_N2_IP} 331 run_cmd ip netns exec h1 ${ping6} -q -M want -i 0.5 -c 10 -w 2 -s ${sz} ${H1_PING_ARG} ${H2_N2_IP6} 332} 333 334replace_route_new() 335{ 336 # r1 to h2 via r2 and eth0 337 run_cmd ip -netns r1 nexthop replace id 1 via ${R2_N1_IP} dev eth0 338 run_cmd ip -netns r1 nexthop replace id 2 via ${R2_LLADDR} dev eth0 339} 340 341reset_route_new() 342{ 343 run_cmd ip -netns r1 nexthop flush 344 run_cmd ip -netns h1 nexthop flush 345 346 initial_route_new 347} 348 349initial_route_new() 350{ 351 # r1 to h2 via r2 and eth1 352 run_cmd ip -netns r1 nexthop add id 1 via ${R2_R1_N1_IP} dev eth1 353 run_cmd ip -netns r1 ro add ${H2_N2} nhid 1 354 355 run_cmd ip -netns r1 nexthop add id 2 via ${R2_R1_N1_IP6} dev eth1 356 run_cmd ip -netns r1 -6 ro add ${H2_N2_6} nhid 2 357 358 # h1 to h2 via r1 359 run_cmd ip -netns h1 nexthop add id 1 via ${R1_N1_IP} dev br0 360 run_cmd ip -netns h1 ro add ${H1_VRF_ARG} ${H2_N2} nhid 1 361 362 run_cmd ip -netns h1 nexthop add id 2 via ${R1_LLADDR} dev br0 363 run_cmd ip -netns h1 -6 ro add ${H1_VRF_ARG} ${H2_N2_6} nhid 2 364} 365 366replace_route_legacy() 367{ 368 # r1 to h2 via r2 and eth0 369 run_cmd ip -netns r1 ro replace ${H2_N2} via ${R2_N1_IP} dev eth0 370 run_cmd ip -netns r1 -6 ro replace ${H2_N2_6} via ${R2_LLADDR} dev eth0 371} 372 373reset_route_legacy() 374{ 375 run_cmd ip -netns r1 ro del ${H2_N2} 376 run_cmd ip -netns r1 -6 ro del ${H2_N2_6} 377 378 run_cmd ip -netns h1 ro del ${H1_VRF_ARG} ${H2_N2} 379 run_cmd ip -netns h1 -6 ro del ${H1_VRF_ARG} ${H2_N2_6} 380 381 initial_route_legacy 382} 383 384initial_route_legacy() 385{ 386 # r1 to h2 via r2 and eth1 387 run_cmd ip -netns r1 ro add ${H2_N2} via ${R2_R1_N1_IP} dev eth1 388 run_cmd ip -netns r1 -6 ro add ${H2_N2_6} via ${R2_R1_N1_IP6} dev eth1 389 390 # h1 to h2 via r1 391 # - IPv6 redirect only works if gateway is the LLA 392 run_cmd ip -netns h1 ro add ${H1_VRF_ARG} ${H2_N2} via ${R1_N1_IP} dev br0 393 run_cmd ip -netns h1 -6 ro add ${H1_VRF_ARG} ${H2_N2_6} via ${R1_LLADDR} dev br0 394} 395 396check_connectivity() 397{ 398 local rc 399 400 run_cmd ip netns exec h1 ping -c1 -w1 ${H1_PING_ARG} ${H2_N2_IP} 401 rc=$? 402 run_cmd ip netns exec h1 ${ping6} -c1 -w1 ${H1_PING_ARG} ${H2_N2_IP6} 403 [ $? -ne 0 ] && rc=$? 404 405 return $rc 406} 407 408do_test() 409{ 410 local ttype="$1" 411 412 eval initial_route_${ttype} 413 414 # verify connectivity 415 check_connectivity 416 if [ $? -ne 0 ]; then 417 echo "Error: Basic connectivity is broken" 418 ret=1 419 return 420 fi 421 422 # redirect exception followed by mtu 423 eval replace_route_${ttype} 424 run_ping 64 425 check_exception "" "yes" "redirect exception" 426 427 check_connectivity 428 if [ $? -ne 0 ]; then 429 echo "Error: Basic connectivity is broken after redirect" 430 ret=1 431 return 432 fi 433 434 change_h2_mtu 1300 435 run_ping 1350 436 check_exception "1300" "yes" "redirect exception plus mtu" 437 438 # remove exceptions and restore routing 439 change_h2_mtu 1500 440 eval reset_route_${ttype} 441 442 check_connectivity 443 if [ $? -ne 0 ]; then 444 echo "Error: Basic connectivity is broken after reset" 445 ret=1 446 return 447 fi 448 check_exception "" "no" "routing reset" 449 450 # MTU exception followed by redirect 451 change_h2_mtu 1300 452 run_ping 1350 453 check_exception "1300" "no" "mtu exception" 454 455 eval replace_route_${ttype} 456 run_ping 64 457 check_exception "1300" "yes" "mtu exception plus redirect" 458 459 check_connectivity 460 if [ $? -ne 0 ]; then 461 echo "Error: Basic connectivity is broken after redirect" 462 ret=1 463 return 464 fi 465} 466 467################################################################################ 468# usage 469 470usage() 471{ 472 cat <<EOF 473usage: ${0##*/} OPTS 474 475 -p Pause on fail 476 -v verbose mode (show commands and output) 477EOF 478} 479 480################################################################################ 481# main 482 483# Some systems don't have a ping6 binary anymore 484which ping6 > /dev/null 2>&1 && ping6=$(which ping6) || ping6=$(which ping) 485 486ret=0 487nsuccess=0 488nfail=0 489 490while getopts :pv o 491do 492 case $o in 493 p) PAUSE_ON_FAIL=yes;; 494 v) VERBOSE=$(($VERBOSE + 1));; 495 *) usage; exit 1;; 496 esac 497done 498 499trap cleanup EXIT 500 501cleanup 502WITH_VRF=no 503setup 504 505log_section "Legacy routing" 506do_test "legacy" 507 508cleanup 509log_section "Legacy routing with VRF" 510WITH_VRF=yes 511setup 512do_test "legacy" 513 514cleanup 515log_section "Routing with nexthop objects" 516ip nexthop ls >/dev/null 2>&1 517if [ $? -eq 0 ]; then 518 WITH_VRF=no 519 setup 520 do_test "new" 521 522 cleanup 523 log_section "Routing with nexthop objects and VRF" 524 WITH_VRF=yes 525 setup 526 do_test "new" 527else 528 echo "Nexthop objects not supported; skipping tests" 529fi 530 531printf "\nTests passed: %3d\n" ${nsuccess} 532printf "Tests failed: %3d\n" ${nfail} 533 534exit $ret 535