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 22source lib.sh 23VERBOSE=0 24PAUSE_ON_FAIL=no 25 26H1_N1_IP=172.16.1.1 27R1_N1_IP=172.16.1.253 28R2_N1_IP=172.16.1.254 29 30H1_N1_IP6=2001:db8:16:1::1 31R1_N1_IP6=2001:db8:16:1::253 32R2_N1_IP6=2001:db8:16:1::254 33 34R1_R2_N1_IP=10.1.1.1 35R2_R1_N1_IP=10.1.1.2 36 37R1_R2_N1_IP6=2001:db8:1::1 38R2_R1_N1_IP6=2001:db8:1::2 39 40H2_N2=172.16.2.0/24 41H2_N2_6=2001:db8:16:2::/64 42H2_N2_IP=172.16.2.2 43R2_N2_IP=172.16.2.254 44H2_N2_IP6=2001:db8:16:2::2 45R2_N2_IP6=2001:db8:16:2::254 46 47VRF=red 48VRF_TABLE=1111 49 50################################################################################ 51# helpers 52 53log_section() 54{ 55 echo 56 echo "###########################################################################" 57 echo "$*" 58 echo "###########################################################################" 59 echo 60} 61 62log_test() 63{ 64 local rc=$1 65 local expected=$2 66 local msg="$3" 67 local xfail=$4 68 69 if [ ${rc} -eq ${expected} ]; then 70 printf "TEST: %-60s [ OK ]\n" "${msg}" 71 nsuccess=$((nsuccess+1)) 72 elif [ ${rc} -eq ${xfail} ]; then 73 printf "TEST: %-60s [XFAIL]\n" "${msg}" 74 nxfail=$((nxfail+1)) 75 else 76 ret=1 77 nfail=$((nfail+1)) 78 printf "TEST: %-60s [FAIL]\n" "${msg}" 79 if [ "${PAUSE_ON_FAIL}" = "yes" ]; then 80 echo 81 echo "hit enter to continue, 'q' to quit" 82 read a 83 [ "$a" = "q" ] && exit 1 84 fi 85 fi 86} 87 88log_debug() 89{ 90 if [ "$VERBOSE" = "1" ]; then 91 echo "$*" 92 fi 93} 94 95run_cmd() 96{ 97 local cmd="$*" 98 local out 99 local rc 100 101 if [ "$VERBOSE" = "1" ]; then 102 echo "COMMAND: $cmd" 103 fi 104 105 out=$(eval $cmd 2>&1) 106 rc=$? 107 if [ "$VERBOSE" = "1" -a -n "$out" ]; then 108 echo "$out" 109 fi 110 111 [ "$VERBOSE" = "1" ] && echo 112 113 return $rc 114} 115 116get_linklocal() 117{ 118 local ns=$1 119 local dev=$2 120 local addr 121 122 addr=$(ip -netns $ns -6 -br addr show dev ${dev} | \ 123 awk '{ 124 for (i = 3; i <= NF; ++i) { 125 if ($i ~ /^fe80/) 126 print $i 127 } 128 }' 129 ) 130 addr=${addr/\/*} 131 132 [ -z "$addr" ] && return 1 133 134 echo $addr 135 136 return 0 137} 138 139################################################################################ 140# setup and teardown 141 142cleanup() 143{ 144 cleanup_ns $h1 $h2 $r1 $r2 145} 146 147create_vrf() 148{ 149 local ns=$1 150 151 ip -netns ${ns} link add ${VRF} type vrf table ${VRF_TABLE} 152 ip -netns ${ns} link set ${VRF} up 153 ip -netns ${ns} route add vrf ${VRF} unreachable default metric 8192 154 ip -netns ${ns} -6 route add vrf ${VRF} unreachable default metric 8192 155 156 ip -netns ${ns} addr add 127.0.0.1/8 dev ${VRF} 157 ip -netns ${ns} -6 addr add ::1 dev ${VRF} nodad 158 159 ip -netns ${ns} ru del pref 0 160 ip -netns ${ns} ru add pref 32765 from all lookup local 161 ip -netns ${ns} -6 ru del pref 0 162 ip -netns ${ns} -6 ru add pref 32765 from all lookup local 163} 164 165setup() 166{ 167 local ns 168 169 # 170 # create nodes as namespaces 171 setup_ns h1 h2 r1 r2 172 for ns in $h1 $h2 $r1 $r2; do 173 if echo $ns | grep -q h[12]-; then 174 ip netns exec $ns sysctl -q -w net.ipv4.conf.all.accept_redirects=1 175 ip netns exec $ns sysctl -q -w net.ipv6.conf.all.forwarding=0 176 ip netns exec $ns sysctl -q -w net.ipv6.conf.all.accept_redirects=1 177 ip netns exec $ns sysctl -q -w net.ipv6.conf.all.keep_addr_on_down=1 178 else 179 ip netns exec $ns sysctl -q -w net.ipv4.ip_forward=1 180 ip netns exec $ns sysctl -q -w net.ipv4.conf.all.send_redirects=1 181 ip netns exec $ns sysctl -q -w net.ipv4.conf.default.rp_filter=0 182 ip netns exec $ns sysctl -q -w net.ipv4.conf.all.rp_filter=0 183 184 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 fi 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: ${desc}" 0 309 310 # No PMTU info for test "redirect" and "mtu exception plus redirect" 311 if [ "$with_redirect" = "yes" ] && [ "$desc" != "redirect exception plus mtu" ]; then 312 ip -netns $h1 -6 ro get ${H1_VRF_ARG} ${H2_N2_IP6} | \ 313 grep -v "mtu" | grep -q "${H2_N2_IP6} .*via ${R2_LLADDR} dev br0" 314 elif [ -n "${mtu}" ]; then 315 ip -netns $h1 -6 ro get ${H1_VRF_ARG} ${H2_N2_IP6} | \ 316 grep -q "${mtu}" 317 else 318 # IPv6 is a bit harder. First strip out the match if it 319 # contains an mtu exception and then look for the first 320 # gateway - R1's lladdr 321 ip -netns $h1 -6 ro get ${H1_VRF_ARG} ${H2_N2_IP6} | \ 322 grep -v "mtu" | grep -q "${R1_LLADDR}" 323 fi 324 log_test $? 0 "IPv6: ${desc}" 1 325} 326 327run_ping() 328{ 329 local sz=$1 330 331 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} 332 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} 333} 334 335replace_route_new() 336{ 337 # r1 to h2 via r2 and eth0 338 run_cmd ip -netns $r1 nexthop replace id 1 via ${R2_N1_IP} dev eth0 339 run_cmd ip -netns $r1 nexthop replace id 2 via ${R2_LLADDR} dev eth0 340} 341 342reset_route_new() 343{ 344 run_cmd ip -netns $r1 nexthop flush 345 run_cmd ip -netns $h1 nexthop flush 346 347 initial_route_new 348} 349 350initial_route_new() 351{ 352 # r1 to h2 via r2 and eth1 353 run_cmd ip -netns $r1 nexthop add id 1 via ${R2_R1_N1_IP} dev eth1 354 run_cmd ip -netns $r1 ro add ${H2_N2} nhid 1 355 356 run_cmd ip -netns $r1 nexthop add id 2 via ${R2_R1_N1_IP6} dev eth1 357 run_cmd ip -netns $r1 -6 ro add ${H2_N2_6} nhid 2 358 359 # h1 to h2 via r1 360 run_cmd ip -netns $h1 nexthop add id 1 via ${R1_N1_IP} dev br0 361 run_cmd ip -netns $h1 ro add ${H1_VRF_ARG} ${H2_N2} nhid 1 362 363 run_cmd ip -netns $h1 nexthop add id 2 via ${R1_LLADDR} dev br0 364 run_cmd ip -netns $h1 -6 ro add ${H1_VRF_ARG} ${H2_N2_6} nhid 2 365} 366 367replace_route_legacy() 368{ 369 # r1 to h2 via r2 and eth0 370 run_cmd ip -netns $r1 ro replace ${H2_N2} via ${R2_N1_IP} dev eth0 371 run_cmd ip -netns $r1 -6 ro replace ${H2_N2_6} via ${R2_LLADDR} dev eth0 372} 373 374reset_route_legacy() 375{ 376 run_cmd ip -netns $r1 ro del ${H2_N2} 377 run_cmd ip -netns $r1 -6 ro del ${H2_N2_6} 378 379 run_cmd ip -netns $h1 ro del ${H1_VRF_ARG} ${H2_N2} 380 run_cmd ip -netns $h1 -6 ro del ${H1_VRF_ARG} ${H2_N2_6} 381 382 initial_route_legacy 383} 384 385initial_route_legacy() 386{ 387 # r1 to h2 via r2 and eth1 388 run_cmd ip -netns $r1 ro add ${H2_N2} via ${R2_R1_N1_IP} dev eth1 389 run_cmd ip -netns $r1 -6 ro add ${H2_N2_6} via ${R2_R1_N1_IP6} dev eth1 390 391 # h1 to h2 via r1 392 # - IPv6 redirect only works if gateway is the LLA 393 run_cmd ip -netns $h1 ro add ${H1_VRF_ARG} ${H2_N2} via ${R1_N1_IP} dev br0 394 run_cmd ip -netns $h1 -6 ro add ${H1_VRF_ARG} ${H2_N2_6} via ${R1_LLADDR} dev br0 395} 396 397check_connectivity() 398{ 399 local rc 400 401 run_cmd ip netns exec $h1 ping -c1 -w1 ${H1_PING_ARG} ${H2_N2_IP} 402 rc=$? 403 run_cmd ip netns exec $h1 ${ping6} -c1 -w1 ${H1_PING_ARG} ${H2_N2_IP6} 404 [ $? -ne 0 ] && rc=$? 405 406 return $rc 407} 408 409do_test() 410{ 411 local ttype="$1" 412 413 eval initial_route_${ttype} 414 415 # verify connectivity 416 check_connectivity 417 if [ $? -ne 0 ]; then 418 echo "Error: Basic connectivity is broken" 419 ret=1 420 return 421 fi 422 423 # redirect exception followed by mtu 424 eval replace_route_${ttype} 425 run_ping 64 426 check_exception "" "yes" "redirect exception" 427 428 check_connectivity 429 if [ $? -ne 0 ]; then 430 echo "Error: Basic connectivity is broken after redirect" 431 ret=1 432 return 433 fi 434 435 change_h2_mtu 1300 436 run_ping 1350 437 check_exception "1300" "yes" "redirect exception plus mtu" 438 439 # remove exceptions and restore routing 440 change_h2_mtu 1500 441 eval reset_route_${ttype} 442 443 check_connectivity 444 if [ $? -ne 0 ]; then 445 echo "Error: Basic connectivity is broken after reset" 446 ret=1 447 return 448 fi 449 check_exception "" "no" "routing reset" 450 451 # MTU exception followed by redirect 452 change_h2_mtu 1300 453 run_ping 1350 454 check_exception "1300" "no" "mtu exception" 455 456 eval replace_route_${ttype} 457 run_ping 64 458 check_exception "1300" "yes" "mtu exception plus redirect" 459 460 check_connectivity 461 if [ $? -ne 0 ]; then 462 echo "Error: Basic connectivity is broken after redirect" 463 ret=1 464 return 465 fi 466} 467 468################################################################################ 469# usage 470 471usage() 472{ 473 cat <<EOF 474usage: ${0##*/} OPTS 475 476 -p Pause on fail 477 -v verbose mode (show commands and output) 478EOF 479} 480 481################################################################################ 482# main 483 484# Some systems don't have a ping6 binary anymore 485which ping6 > /dev/null 2>&1 && ping6=$(which ping6) || ping6=$(which ping) 486 487ret=0 488nsuccess=0 489nfail=0 490nxfail=0 491 492while getopts :pv o 493do 494 case $o in 495 p) PAUSE_ON_FAIL=yes;; 496 v) VERBOSE=$(($VERBOSE + 1));; 497 *) usage; exit 1;; 498 esac 499done 500 501trap cleanup EXIT 502 503cleanup 504WITH_VRF=no 505setup 506 507log_section "Legacy routing" 508do_test "legacy" 509 510cleanup 511log_section "Legacy routing with VRF" 512WITH_VRF=yes 513setup 514do_test "legacy" 515 516cleanup 517log_section "Routing with nexthop objects" 518ip nexthop ls >/dev/null 2>&1 519if [ $? -eq 0 ]; then 520 WITH_VRF=no 521 setup 522 do_test "new" 523 524 cleanup 525 log_section "Routing with nexthop objects and VRF" 526 WITH_VRF=yes 527 setup 528 do_test "new" 529else 530 echo "Nexthop objects not supported; skipping tests" 531fi 532 533printf "\nTests passed: %3d\n" ${nsuccess} 534printf "Tests failed: %3d\n" ${nfail} 535printf "Tests xfailed: %3d\n" ${nxfail} 536 537exit $ret 538