1#!/bin/bash 2# SPDX-License-Identifier: GPL-2.0 3# 4# author: Andrea Mayer <andrea.mayer@uniroma2.it> 5 6# This test is designed for evaluating the new SRv6 End.DT4 behavior used for 7# implementing IPv4 L3 VPN use cases. 8# 9# Hereafter a network diagram is shown, where two different tenants (named 100 10# and 200) offer IPv4 L3 VPN services allowing hosts to communicate with each 11# other across an IPv6 network. 12# 13# Only hosts belonging to the same tenant (and to the same VPN) can communicate 14# with each other. Instead, the communication among hosts of different tenants 15# is forbidden. 16# In other words, hosts hs-t100-1 and hs-t100-2 are connected through the IPv4 17# L3 VPN of tenant 100 while hs-t200-3 and hs-t200-4 are connected using the 18# IPv4 L3 VPN of tenant 200. Cross connection between tenant 100 and tenant 200 19# is forbidden and thus, for example, hs-t100-1 cannot reach hs-t200-3 and vice 20# versa. 21# 22# Routers rt-1 and rt-2 implement IPv4 L3 VPN services leveraging the SRv6 23# architecture. The key components for such VPNs are: a) SRv6 Encap behavior, 24# b) SRv6 End.DT4 behavior and c) VRF. 25# 26# To explain how an IPv4 L3 VPN based on SRv6 works, let us briefly consider an 27# example where, within the same domain of tenant 100, the host hs-t100-1 pings 28# the host hs-t100-2. 29# 30# First of all, L2 reachability of the host hs-t100-2 is taken into account by 31# the router rt-1 which acts as an arp proxy. 32# 33# When the host hs-t100-1 sends an IPv4 packet destined to hs-t100-2, the 34# router rt-1 receives the packet on the internal veth-t100 interface. Such 35# interface is enslaved to the VRF vrf-100 whose associated table contains the 36# SRv6 Encap route for encapsulating any IPv4 packet in a IPv6 plus the Segment 37# Routing Header (SRH) packet. This packet is sent through the (IPv6) core 38# network up to the router rt-2 that receives it on veth0 interface. 39# 40# The rt-2 router uses the 'localsid' routing table to process incoming 41# IPv6+SRH packets which belong to the VPN of the tenant 100. For each of these 42# packets, the SRv6 End.DT4 behavior removes the outer IPv6+SRH headers and 43# performs the lookup on the vrf-100 table using the destination address of 44# the decapsulated IPv4 packet. Afterwards, the packet is sent to the host 45# hs-t100-2 through the veth-t100 interface. 46# 47# The ping response follows the same processing but this time the role of rt-1 48# and rt-2 are swapped. 49# 50# Of course, the IPv4 L3 VPN for tenant 200 works exactly as the IPv4 L3 VPN 51# for tenant 100. In this case, only hosts hs-t200-3 and hs-t200-4 are able to 52# connect with each other. 53# 54# 55# +-------------------+ +-------------------+ 56# | | | | 57# | hs-t100-1 netns | | hs-t100-2 netns | 58# | | | | 59# | +-------------+ | | +-------------+ | 60# | | veth0 | | | | veth0 | | 61# | | 10.0.0.1/24 | | | | 10.0.0.2/24 | | 62# | +-------------+ | | +-------------+ | 63# | . | | . | 64# +-------------------+ +-------------------+ 65# . . 66# . . 67# . . 68# +-----------------------------------+ +-----------------------------------+ 69# | . | | . | 70# | +---------------+ | | +---------------- | 71# | | veth-t100 | | | | veth-t100 | | 72# | | 10.0.0.254/24 | +----------+ | | +----------+ | 10.0.0.254/24 | | 73# | +-------+-------+ | localsid | | | | localsid | +-------+-------- | 74# | | | table | | | | table | | | 75# | +----+----+ +----------+ | | +----------+ +----+----+ | 76# | | vrf-100 | | | | vrf-100 | | 77# | +---------+ +------------+ | | +------------+ +---------+ | 78# | | veth0 | | | | veth0 | | 79# | | fd00::1/64 |.|...|.| fd00::2/64 | | 80# | +---------+ +------------+ | | +------------+ +---------+ | 81# | | vrf-200 | | | | vrf-200 | | 82# | +----+----+ | | +----+----+ | 83# | | | | | | 84# | +-------+-------+ | | +-------+-------- | 85# | | veth-t200 | | | | veth-t200 | | 86# | | 10.0.0.254/24 | | | | 10.0.0.254/24 | | 87# | +---------------+ rt-1 netns | | rt-2 netns +---------------- | 88# | . | | . | 89# +-----------------------------------+ +-----------------------------------+ 90# . . 91# . . 92# . . 93# . . 94# +-------------------+ +-------------------+ 95# | . | | . | 96# | +-------------+ | | +-------------+ | 97# | | veth0 | | | | veth0 | | 98# | | 10.0.0.3/24 | | | | 10.0.0.4/24 | | 99# | +-------------+ | | +-------------+ | 100# | | | | 101# | hs-t200-3 netns | | hs-t200-4 netns | 102# | | | | 103# +-------------------+ +-------------------+ 104# 105# 106# ~~~~~~~~~~~~~~~~~~~~~~~~~ 107# | Network configuration | 108# ~~~~~~~~~~~~~~~~~~~~~~~~~ 109# 110# rt-1: localsid table (table 90) 111# +-------------------------------------------------+ 112# |SID |Action | 113# +-------------------------------------------------+ 114# |fc00:21:100::6004|apply SRv6 End.DT4 vrftable 100| 115# +-------------------------------------------------+ 116# |fc00:21:200::6004|apply SRv6 End.DT4 vrftable 200| 117# +-------------------------------------------------+ 118# 119# rt-1: VRF tenant 100 (table 100) 120# +---------------------------------------------------+ 121# |host |Action | 122# +---------------------------------------------------+ 123# |10.0.0.2 |apply seg6 encap segs fc00:12:100::6004| 124# +---------------------------------------------------+ 125# |10.0.0.0/24|forward to dev veth_t100 | 126# +---------------------------------------------------+ 127# 128# rt-1: VRF tenant 200 (table 200) 129# +---------------------------------------------------+ 130# |host |Action | 131# +---------------------------------------------------+ 132# |10.0.0.4 |apply seg6 encap segs fc00:12:200::6004| 133# +---------------------------------------------------+ 134# |10.0.0.0/24|forward to dev veth_t200 | 135# +---------------------------------------------------+ 136# 137# 138# rt-2: localsid table (table 90) 139# +-------------------------------------------------+ 140# |SID |Action | 141# +-------------------------------------------------+ 142# |fc00:12:100::6004|apply SRv6 End.DT4 vrftable 100| 143# +-------------------------------------------------+ 144# |fc00:12:200::6004|apply SRv6 End.DT4 vrftable 200| 145# +-------------------------------------------------+ 146# 147# rt-2: VRF tenant 100 (table 100) 148# +---------------------------------------------------+ 149# |host |Action | 150# +---------------------------------------------------+ 151# |10.0.0.1 |apply seg6 encap segs fc00:21:100::6004| 152# +---------------------------------------------------+ 153# |10.0.0.0/24|forward to dev veth_t100 | 154# +---------------------------------------------------+ 155# 156# rt-2: VRF tenant 200 (table 200) 157# +---------------------------------------------------+ 158# |host |Action | 159# +---------------------------------------------------+ 160# |10.0.0.3 |apply seg6 encap segs fc00:21:200::6004| 161# +---------------------------------------------------+ 162# |10.0.0.0/24|forward to dev veth_t200 | 163# +---------------------------------------------------+ 164# 165 166source lib.sh 167 168readonly LOCALSID_TABLE_ID=90 169readonly IPv6_RT_NETWORK=fd00 170readonly IPv4_HS_NETWORK=10.0.0 171readonly VPN_LOCATOR_SERVICE=fc00 172PING_TIMEOUT_SEC=4 173 174ret=0 175 176PAUSE_ON_FAIL=${PAUSE_ON_FAIL:=no} 177 178log_test() 179{ 180 local rc=$1 181 local expected=$2 182 local msg="$3" 183 184 if [ ${rc} -eq ${expected} ]; then 185 nsuccess=$((nsuccess+1)) 186 printf "\n TEST: %-60s [ OK ]\n" "${msg}" 187 else 188 ret=1 189 nfail=$((nfail+1)) 190 printf "\n TEST: %-60s [FAIL]\n" "${msg}" 191 if [ "${PAUSE_ON_FAIL}" = "yes" ]; then 192 echo 193 echo "hit enter to continue, 'q' to quit" 194 read a 195 [ "$a" = "q" ] && exit 1 196 fi 197 fi 198} 199 200print_log_test_results() 201{ 202 if [ "$TESTS" != "none" ]; then 203 printf "\nTests passed: %3d\n" ${nsuccess} 204 printf "Tests failed: %3d\n" ${nfail} 205 fi 206} 207 208log_section() 209{ 210 echo 211 echo "################################################################################" 212 echo "TEST SECTION: $*" 213 echo "################################################################################" 214} 215 216cleanup() 217{ 218 ip link del veth-rt-1 2>/dev/null || true 219 ip link del veth-rt-2 2>/dev/null || true 220 221 cleanup_all_ns 222} 223 224# Setup the basic networking for the routers 225setup_rt_networking() 226{ 227 local id=$1 228 eval local nsname=\${rt_${id}} 229 230 ip netns exec ${nsname} sysctl -wq net.ipv6.conf.all.accept_dad=0 231 ip netns exec ${nsname} sysctl -wq net.ipv6.conf.default.accept_dad=0 232 233 ip link set veth-rt-${id} netns ${nsname} 234 ip -netns ${nsname} link set veth-rt-${id} name veth0 235 236 ip -netns ${nsname} addr add ${IPv6_RT_NETWORK}::${id}/64 dev veth0 nodad 237 ip -netns ${nsname} link set veth0 up 238 ip -netns ${nsname} link set lo up 239 240 ip netns exec ${nsname} sysctl -wq net.ipv4.ip_forward=1 241 ip netns exec ${nsname} sysctl -wq net.ipv6.conf.all.forwarding=1 242} 243 244setup_hs() 245{ 246 local hid=$1 247 local rid=$2 248 local tid=$3 249 eval local hsname=\${hs_t${tid}_${hid}} 250 eval local rtname=\${rt_${rid}} 251 local rtveth=veth-t${tid} 252 253 # disable the rp_filter otherwise the kernel gets confused about how 254 # to route decap ipv4 packets. 255 ip netns exec ${rtname} sysctl -wq net.ipv4.conf.all.rp_filter=0 256 ip netns exec ${rtname} sysctl -wq net.ipv4.conf.default.rp_filter=0 257 258 ip -netns ${hsname} link add veth0 type veth peer name ${rtveth} 259 ip -netns ${hsname} link set ${rtveth} netns ${rtname} 260 ip -netns ${hsname} addr add ${IPv4_HS_NETWORK}.${hid}/24 dev veth0 261 ip -netns ${hsname} link set veth0 up 262 ip -netns ${hsname} link set lo up 263 264 # configure the VRF for the tenant X on the router which is directly 265 # connected to the source host. 266 ip -netns ${rtname} link add vrf-${tid} type vrf table ${tid} 267 ip -netns ${rtname} link set vrf-${tid} up 268 269 # enslave the veth-tX interface to the vrf-X in the access router 270 ip -netns ${rtname} link set ${rtveth} master vrf-${tid} 271 ip -netns ${rtname} addr add ${IPv4_HS_NETWORK}.254/24 dev ${rtveth} 272 ip -netns ${rtname} link set ${rtveth} up 273 274 ip netns exec ${rtname} sysctl -wq net.ipv4.conf.${rtveth}.proxy_arp=1 275 276 ip netns exec ${rtname} sh -c "echo 1 > /proc/sys/net/vrf/strict_mode" 277} 278 279setup_vpn_config() 280{ 281 local hssrc=$1 282 local rtsrc=$2 283 local hsdst=$3 284 local rtdst=$4 285 local tid=$5 286 287 eval local rtsrc_name=\${rt_${rtsrc}} 288 eval local rtdst_name=\${rt_${rtdst}} 289 local vpn_sid=${VPN_LOCATOR_SERVICE}:${hssrc}${hsdst}:${tid}::6004 290 291 # set the encap route for encapsulating packets which arrive from the 292 # host hssrc and destined to the access router rtsrc. 293 ip -netns ${rtsrc_name} -4 route add ${IPv4_HS_NETWORK}.${hsdst}/32 vrf vrf-${tid} \ 294 encap seg6 mode encap segs ${vpn_sid} dev veth0 295 ip -netns ${rtsrc_name} -6 route add ${vpn_sid}/128 vrf vrf-${tid} \ 296 via fd00::${rtdst} dev veth0 297 298 # set the decap route for decapsulating packets which arrive from 299 # the rtdst router and destined to the hsdst host. 300 ip -netns ${rtdst_name} -6 route add ${vpn_sid}/128 table ${LOCALSID_TABLE_ID} \ 301 encap seg6local action End.DT4 vrftable ${tid} dev vrf-${tid} 302 303 # all sids for VPNs start with a common locator which is fc00::/16. 304 # Routes for handling the SRv6 End.DT4 behavior instances are grouped 305 # together in the 'localsid' table. 306 # 307 # NOTE: added only once 308 if [ -z "$(ip -netns ${rtdst_name} -6 rule show | \ 309 grep "to ${VPN_LOCATOR_SERVICE}::/16 lookup ${LOCALSID_TABLE_ID}")" ]; then 310 ip -netns ${rtdst_name} -6 rule add \ 311 to ${VPN_LOCATOR_SERVICE}::/16 \ 312 lookup ${LOCALSID_TABLE_ID} prio 999 313 fi 314} 315 316setup() 317{ 318 ip link add veth-rt-1 type veth peer name veth-rt-2 319 # setup the networking for router rt-1 and router rt-2 320 setup_ns rt_1 rt_2 321 setup_rt_networking 1 322 setup_rt_networking 2 323 324 # setup two hosts for the tenant 100. 325 # - host hs-1 is directly connected to the router rt-1; 326 # - host hs-2 is directly connected to the router rt-2. 327 setup_ns hs_t100_1 hs_t100_2 328 setup_hs 1 1 100 #args: host router tenant 329 setup_hs 2 2 100 330 331 # setup two hosts for the tenant 200 332 # - host hs-3 is directly connected to the router rt-1; 333 # - host hs-4 is directly connected to the router rt-2. 334 setup_ns hs_t200_3 hs_t200_4 335 setup_hs 3 1 200 336 setup_hs 4 2 200 337 338 # setup the IPv4 L3 VPN which connects the host hs-t100-1 and host 339 # hs-t100-2 within the same tenant 100. 340 setup_vpn_config 1 1 2 2 100 #args: src_host src_router dst_host dst_router tenant 341 setup_vpn_config 2 2 1 1 100 342 343 # setup the IPv4 L3 VPN which connects the host hs-t200-3 and host 344 # hs-t200-4 within the same tenant 200. 345 setup_vpn_config 3 1 4 2 200 346 setup_vpn_config 4 2 3 1 200 347} 348 349check_rt_connectivity() 350{ 351 local rtsrc=$1 352 local rtdst=$2 353 eval local nsname=\${rt_${rtsrc}} 354 355 ip netns exec ${nsname} ping -c 1 -W 1 ${IPv6_RT_NETWORK}::${rtdst} \ 356 >/dev/null 2>&1 357} 358 359check_and_log_rt_connectivity() 360{ 361 local rtsrc=$1 362 local rtdst=$2 363 364 check_rt_connectivity ${rtsrc} ${rtdst} 365 log_test $? 0 "Routers connectivity: rt-${rtsrc} -> rt-${rtdst}" 366} 367 368check_hs_connectivity() 369{ 370 local hssrc=$1 371 local hsdst=$2 372 local tid=$3 373 eval local nsname=\${hs_t${tid}_${hssrc}} 374 375 ip netns exec ${nsname} ping -c 1 -W ${PING_TIMEOUT_SEC} \ 376 ${IPv4_HS_NETWORK}.${hsdst} >/dev/null 2>&1 377} 378 379check_and_log_hs_connectivity() 380{ 381 local hssrc=$1 382 local hsdst=$2 383 local tid=$3 384 385 check_hs_connectivity ${hssrc} ${hsdst} ${tid} 386 log_test $? 0 "Hosts connectivity: hs-t${tid}-${hssrc} -> hs-t${tid}-${hsdst} (tenant ${tid})" 387} 388 389check_and_log_hs_isolation() 390{ 391 local hssrc=$1 392 local tidsrc=$2 393 local hsdst=$3 394 local tiddst=$4 395 396 check_hs_connectivity ${hssrc} ${hsdst} ${tidsrc} 397 # NOTE: ping should fail 398 log_test $? 1 "Hosts isolation: hs-t${tidsrc}-${hssrc} -X-> hs-t${tiddst}-${hsdst}" 399} 400 401 402check_and_log_hs2gw_connectivity() 403{ 404 local hssrc=$1 405 local tid=$2 406 407 check_hs_connectivity ${hssrc} 254 ${tid} 408 log_test $? 0 "Hosts connectivity: hs-t${tid}-${hssrc} -> gw (tenant ${tid})" 409} 410 411router_tests() 412{ 413 log_section "IPv6 routers connectivity test" 414 415 check_and_log_rt_connectivity 1 2 416 check_and_log_rt_connectivity 2 1 417} 418 419host2gateway_tests() 420{ 421 log_section "IPv4 connectivity test among hosts and gateway" 422 423 check_and_log_hs2gw_connectivity 1 100 424 check_and_log_hs2gw_connectivity 2 100 425 426 check_and_log_hs2gw_connectivity 3 200 427 check_and_log_hs2gw_connectivity 4 200 428} 429 430host_vpn_tests() 431{ 432 log_section "SRv6 VPN connectivity test among hosts in the same tenant" 433 434 check_and_log_hs_connectivity 1 2 100 435 check_and_log_hs_connectivity 2 1 100 436 437 check_and_log_hs_connectivity 3 4 200 438 check_and_log_hs_connectivity 4 3 200 439} 440 441host_vpn_isolation_tests() 442{ 443 local i 444 local j 445 local k 446 local tmp 447 local l1="1 2" 448 local l2="3 4" 449 local t1=100 450 local t2=200 451 452 log_section "SRv6 VPN isolation test among hosts in different tentants" 453 454 for k in 0 1; do 455 for i in ${l1}; do 456 for j in ${l2}; do 457 check_and_log_hs_isolation ${i} ${t1} ${j} ${t2} 458 done 459 done 460 461 # let us test the reverse path 462 tmp="${l1}"; l1="${l2}"; l2="${tmp}" 463 tmp=${t1}; t1=${t2}; t2=${tmp} 464 done 465} 466 467if [ "$(id -u)" -ne 0 ];then 468 echo "SKIP: Need root privileges" 469 exit $ksft_skip 470fi 471 472if [ ! -x "$(command -v ip)" ]; then 473 echo "SKIP: Could not run test without ip tool" 474 exit $ksft_skip 475fi 476 477modprobe vrf &>/dev/null 478if [ ! -e /proc/sys/net/vrf/strict_mode ]; then 479 echo "SKIP: vrf sysctl does not exist" 480 exit $ksft_skip 481fi 482 483cleanup &>/dev/null 484 485setup 486 487router_tests 488host2gateway_tests 489host_vpn_tests 490host_vpn_isolation_tests 491 492print_log_test_results 493 494cleanup &>/dev/null 495 496exit ${ret} 497