1#!/bin/bash 2# SPDX-License-Identifier: GPL-2.0 3# 4# author: Andrea Mayer <andrea.mayer@uniroma2.it> 5# author: Paolo Lungaroni <paolo.lungaroni@cnit.it> 6 7# This test is designed for evaluating the new SRv6 End.DT6 behavior used for 8# implementing IPv6 L3 VPN use cases. 9# 10# Hereafter a network diagram is shown, where two different tenants (named 100 11# and 200) offer IPv6 L3 VPN services allowing hosts to communicate with each 12# other across an IPv6 network. 13# 14# Only hosts belonging to the same tenant (and to the same VPN) can communicate 15# with each other. Instead, the communication among hosts of different tenants 16# is forbidden. 17# In other words, hosts hs-t100-1 and hs-t100-2 are connected through the IPv6 18# L3 VPN of tenant 100 while hs-t200-3 and hs-t200-4 are connected using the 19# IPv6 L3 VPN of tenant 200. Cross connection between tenant 100 and tenant 200 20# is forbidden and thus, for example, hs-t100-1 cannot reach hs-t200-3 and vice 21# versa. 22# 23# Routers rt-1 and rt-2 implement IPv6 L3 VPN services leveraging the SRv6 24# architecture. The key components for such VPNs are: a) SRv6 Encap behavior, 25# b) SRv6 End.DT6 behavior and c) VRF. 26# 27# To explain how an IPv6 L3 VPN based on SRv6 works, let us briefly consider an 28# example where, within the same domain of tenant 100, the host hs-t100-1 pings 29# the host hs-t100-2. 30# 31# First of all, L2 reachability of the host hs-t100-2 is taken into account by 32# the router rt-1 which acts as a ndp proxy. 33# 34# When the host hs-t100-1 sends an IPv6 packet destined to hs-t100-2, the 35# router rt-1 receives the packet on the internal veth-t100 interface. Such 36# interface is enslaved to the VRF vrf-100 whose associated table contains the 37# SRv6 Encap route for encapsulating any IPv6 packet in a IPv6 plus the Segment 38# Routing Header (SRH) packet. This packet is sent through the (IPv6) core 39# network up to the router rt-2 that receives it on veth0 interface. 40# 41# The rt-2 router uses the 'localsid' routing table to process incoming 42# IPv6+SRH packets which belong to the VPN of the tenant 100. For each of these 43# packets, the SRv6 End.DT6 behavior removes the outer IPv6+SRH headers and 44# performs the lookup on the vrf-100 table using the destination address of 45# the decapsulated IPv6 packet. Afterwards, the packet is sent to the host 46# hs-t100-2 through the veth-t100 interface. 47# 48# The ping response follows the same processing but this time the role of rt-1 49# and rt-2 are swapped. 50# 51# Of course, the IPv6 L3 VPN for tenant 200 works exactly as the IPv6 L3 VPN 52# for tenant 100. In this case, only hosts hs-t200-3 and hs-t200-4 are able to 53# connect with each other. 54# 55# 56# +-------------------+ +-------------------+ 57# | | | | 58# | hs-t100-1 netns | | hs-t100-2 netns | 59# | | | | 60# | +-------------+ | | +-------------+ | 61# | | veth0 | | | | veth0 | | 62# | | cafe::1/64 | | | | cafe::2/64 | | 63# | +-------------+ | | +-------------+ | 64# | . | | . | 65# +-------------------+ +-------------------+ 66# . . 67# . . 68# . . 69# +-----------------------------------+ +-----------------------------------+ 70# | . | | . | 71# | +---------------+ | | +---------------- | 72# | | veth-t100 | | | | veth-t100 | | 73# | | cafe::254/64 | +----------+ | | +----------+ | cafe::254/64 | | 74# | +-------+-------+ | localsid | | | | localsid | +-------+-------- | 75# | | | table | | | | table | | | 76# | +----+----+ +----------+ | | +----------+ +----+----+ | 77# | | vrf-100 | | | | vrf-100 | | 78# | +---------+ +------------+ | | +------------+ +---------+ | 79# | | veth0 | | | | veth0 | | 80# | | fd00::1/64 |.|...|.| fd00::2/64 | | 81# | +---------+ +------------+ | | +------------+ +---------+ | 82# | | vrf-200 | | | | vrf-200 | | 83# | +----+----+ | | +----+----+ | 84# | | | | | | 85# | +-------+-------+ | | +-------+-------- | 86# | | veth-t200 | | | | veth-t200 | | 87# | | cafe::254/64 | | | | cafe::254/64 | | 88# | +---------------+ rt-1 netns | | rt-2 netns +---------------- | 89# | . | | . | 90# +-----------------------------------+ +-----------------------------------+ 91# . . 92# . . 93# . . 94# . . 95# +-------------------+ +-------------------+ 96# | . | | . | 97# | +-------------+ | | +-------------+ | 98# | | veth0 | | | | veth0 | | 99# | | cafe::3/64 | | | | cafe::4/64 | | 100# | +-------------+ | | +-------------+ | 101# | | | | 102# | hs-t200-3 netns | | hs-t200-4 netns | 103# | | | | 104# +-------------------+ +-------------------+ 105# 106# 107# ~~~~~~~~~~~~~~~~~~~~~~~~~ 108# | Network configuration | 109# ~~~~~~~~~~~~~~~~~~~~~~~~~ 110# 111# rt-1: localsid table (table 90) 112# +-------------------------------------------------+ 113# |SID |Action | 114# +-------------------------------------------------+ 115# |fc00:21:100::6006|apply SRv6 End.DT6 vrftable 100| 116# +-------------------------------------------------+ 117# |fc00:21:200::6006|apply SRv6 End.DT6 vrftable 200| 118# +-------------------------------------------------+ 119# 120# rt-1: VRF tenant 100 (table 100) 121# +---------------------------------------------------+ 122# |host |Action | 123# +---------------------------------------------------+ 124# |cafe::2 |apply seg6 encap segs fc00:12:100::6006| 125# +---------------------------------------------------+ 126# |cafe::/64 |forward to dev veth_t100 | 127# +---------------------------------------------------+ 128# 129# rt-1: VRF tenant 200 (table 200) 130# +---------------------------------------------------+ 131# |host |Action | 132# +---------------------------------------------------+ 133# |cafe::4 |apply seg6 encap segs fc00:12:200::6006| 134# +---------------------------------------------------+ 135# |cafe::/64 |forward to dev veth_t200 | 136# +---------------------------------------------------+ 137# 138# 139# rt-2: localsid table (table 90) 140# +-------------------------------------------------+ 141# |SID |Action | 142# +-------------------------------------------------+ 143# |fc00:12:100::6006|apply SRv6 End.DT6 vrftable 100| 144# +-------------------------------------------------+ 145# |fc00:12:200::6006|apply SRv6 End.DT6 vrftable 200| 146# +-------------------------------------------------+ 147# 148# rt-2: VRF tenant 100 (table 100) 149# +---------------------------------------------------+ 150# |host |Action | 151# +---------------------------------------------------+ 152# |cafe::1 |apply seg6 encap segs fc00:21:100::6006| 153# +---------------------------------------------------+ 154# |cafe::/64 |forward to dev veth_t100 | 155# +---------------------------------------------------+ 156# 157# rt-2: VRF tenant 200 (table 200) 158# +---------------------------------------------------+ 159# |host |Action | 160# +---------------------------------------------------+ 161# |cafe::3 |apply seg6 encap segs fc00:21:200::6006| 162# +---------------------------------------------------+ 163# |cafe::/64 |forward to dev veth_t200 | 164# +---------------------------------------------------+ 165# 166 167source lib.sh 168 169readonly LOCALSID_TABLE_ID=90 170readonly IPv6_RT_NETWORK=fd00 171readonly IPv6_HS_NETWORK=cafe 172readonly VPN_LOCATOR_SERVICE=fc00 173PING_TIMEOUT_SEC=4 174 175ret=0 176 177PAUSE_ON_FAIL=${PAUSE_ON_FAIL:=no} 178 179log_test() 180{ 181 local rc=$1 182 local expected=$2 183 local msg="$3" 184 185 if [ ${rc} -eq ${expected} ]; then 186 nsuccess=$((nsuccess+1)) 187 printf "\n TEST: %-60s [ OK ]\n" "${msg}" 188 else 189 ret=1 190 nfail=$((nfail+1)) 191 printf "\n TEST: %-60s [FAIL]\n" "${msg}" 192 if [ "${PAUSE_ON_FAIL}" = "yes" ]; then 193 echo 194 echo "hit enter to continue, 'q' to quit" 195 read a 196 [ "$a" = "q" ] && exit 1 197 fi 198 fi 199} 200 201print_log_test_results() 202{ 203 if [ "$TESTS" != "none" ]; then 204 printf "\nTests passed: %3d\n" ${nsuccess} 205 printf "Tests failed: %3d\n" ${nfail} 206 fi 207} 208 209log_section() 210{ 211 echo 212 echo "################################################################################" 213 echo "TEST SECTION: $*" 214 echo "################################################################################" 215} 216 217cleanup() 218{ 219 ip link del veth-rt-1 2>/dev/null || true 220 ip link del veth-rt-2 2>/dev/null || true 221 222 cleanup_all_ns 223} 224 225# Setup the basic networking for the routers 226setup_rt_networking() 227{ 228 local id=$1 229 eval local nsname=\${rt_${id}} 230 231 ip link set veth-rt-${id} netns ${nsname} 232 ip -netns ${nsname} link set veth-rt-${id} name veth0 233 234 ip netns exec ${nsname} sysctl -wq net.ipv6.conf.all.accept_dad=0 235 ip netns exec ${nsname} sysctl -wq net.ipv6.conf.default.accept_dad=0 236 237 ip -netns ${nsname} addr add ${IPv6_RT_NETWORK}::${id}/64 dev veth0 nodad 238 ip -netns ${nsname} link set veth0 up 239 ip -netns ${nsname} link set lo up 240 241 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 # set the networking for the host 254 ip netns exec ${hsname} sysctl -wq net.ipv6.conf.all.accept_dad=0 255 ip netns exec ${hsname} sysctl -wq net.ipv6.conf.default.accept_dad=0 256 257 ip -netns ${hsname} link add veth0 type veth peer name ${rtveth} 258 ip -netns ${hsname} link set ${rtveth} netns ${rtname} 259 ip -netns ${hsname} addr add ${IPv6_HS_NETWORK}::${hid}/64 dev veth0 nodad 260 ip -netns ${hsname} link set veth0 up 261 ip -netns ${hsname} link set lo up 262 263 # configure the VRF for the tenant X on the router which is directly 264 # connected to the source host. 265 ip -netns ${rtname} link add vrf-${tid} type vrf table ${tid} 266 ip -netns ${rtname} link set vrf-${tid} up 267 268 ip netns exec ${rtname} sysctl -wq net.ipv6.conf.all.accept_dad=0 269 ip netns exec ${rtname} sysctl -wq net.ipv6.conf.default.accept_dad=0 270 271 # enslave the veth-tX interface to the vrf-X in the access router 272 ip -netns ${rtname} link set ${rtveth} master vrf-${tid} 273 ip -netns ${rtname} addr add ${IPv6_HS_NETWORK}::254/64 dev ${rtveth} nodad 274 ip -netns ${rtname} link set ${rtveth} up 275 276 ip netns exec ${rtname} sysctl -wq net.ipv6.conf.${rtveth}.proxy_ndp=1 277 278 ip netns exec ${rtname} sh -c "echo 1 > /proc/sys/net/vrf/strict_mode" 279} 280 281setup_vpn_config() 282{ 283 local hssrc=$1 284 local rtsrc=$2 285 local hsdst=$3 286 local rtdst=$4 287 local tid=$5 288 289 eval local rtsrc_name=\${rt_${rtsrc}} 290 eval local rtdst_name=\${rt_${rtdst}} 291 local rtveth=veth-t${tid} 292 local vpn_sid=${VPN_LOCATOR_SERVICE}:${hssrc}${hsdst}:${tid}::6006 293 294 ip -netns ${rtsrc_name} -6 neigh add proxy ${IPv6_HS_NETWORK}::${hsdst} dev ${rtveth} 295 296 # set the encap route for encapsulating packets which arrive from the 297 # host hssrc and destined to the access router rtsrc. 298 ip -netns ${rtsrc_name} -6 route add ${IPv6_HS_NETWORK}::${hsdst}/128 vrf vrf-${tid} \ 299 encap seg6 mode encap segs ${vpn_sid} dev veth0 300 ip -netns ${rtsrc_name} -6 route add ${vpn_sid}/128 vrf vrf-${tid} \ 301 via fd00::${rtdst} dev veth0 302 303 # set the decap route for decapsulating packets which arrive from 304 # the rtdst router and destined to the hsdst host. 305 ip -netns ${rtdst_name} -6 route add ${vpn_sid}/128 table ${LOCALSID_TABLE_ID} \ 306 encap seg6local action End.DT6 vrftable ${tid} dev vrf-${tid} 307 308 # all sids for VPNs start with a common locator which is fc00::/16. 309 # Routes for handling the SRv6 End.DT6 behavior instances are grouped 310 # together in the 'localsid' table. 311 # 312 # NOTE: added only once 313 if [ -z "$(ip -netns ${rtdst_name} -6 rule show | \ 314 grep "to ${VPN_LOCATOR_SERVICE}::/16 lookup ${LOCALSID_TABLE_ID}")" ]; then 315 ip -netns ${rtdst_name} -6 rule add \ 316 to ${VPN_LOCATOR_SERVICE}::/16 \ 317 lookup ${LOCALSID_TABLE_ID} prio 999 318 fi 319} 320 321setup() 322{ 323 ip link add veth-rt-1 type veth peer name veth-rt-2 324 # setup the networking for router rt-1 and router rt-2 325 setup_ns rt_1 rt_2 326 setup_rt_networking 1 327 setup_rt_networking 2 328 329 # setup two hosts for the tenant 100. 330 # - host hs-1 is directly connected to the router rt-1; 331 # - host hs-2 is directly connected to the router rt-2. 332 setup_ns hs_t100_1 hs_t100_2 333 setup_hs 1 1 100 #args: host router tenant 334 setup_hs 2 2 100 335 336 # setup two hosts for the tenant 200 337 # - host hs-3 is directly connected to the router rt-1; 338 # - host hs-4 is directly connected to the router rt-2. 339 setup_ns hs_t200_3 hs_t200_4 340 setup_hs 3 1 200 341 setup_hs 4 2 200 342 343 # setup the IPv6 L3 VPN which connects the host hs-t100-1 and host 344 # hs-t100-2 within the same tenant 100. 345 setup_vpn_config 1 1 2 2 100 #args: src_host src_router dst_host dst_router tenant 346 setup_vpn_config 2 2 1 1 100 347 348 # setup the IPv6 L3 VPN which connects the host hs-t200-3 and host 349 # hs-t200-4 within the same tenant 200. 350 setup_vpn_config 3 1 4 2 200 351 setup_vpn_config 4 2 3 1 200 352} 353 354check_rt_connectivity() 355{ 356 local rtsrc=$1 357 local rtdst=$2 358 eval local nsname=\${rt_${rtsrc}} 359 360 ip netns exec ${nsname} ping -c 1 -W 1 ${IPv6_RT_NETWORK}::${rtdst} \ 361 >/dev/null 2>&1 362} 363 364check_and_log_rt_connectivity() 365{ 366 local rtsrc=$1 367 local rtdst=$2 368 369 check_rt_connectivity ${rtsrc} ${rtdst} 370 log_test $? 0 "Routers connectivity: rt-${rtsrc} -> rt-${rtdst}" 371} 372 373check_hs_connectivity() 374{ 375 local hssrc=$1 376 local hsdst=$2 377 local tid=$3 378 eval local nsname=\${hs_t${tid}_${hssrc}} 379 380 ip netns exec ${nsname} ping -c 1 -W ${PING_TIMEOUT_SEC} \ 381 ${IPv6_HS_NETWORK}::${hsdst} >/dev/null 2>&1 382} 383 384check_and_log_hs_connectivity() 385{ 386 local hssrc=$1 387 local hsdst=$2 388 local tid=$3 389 390 check_hs_connectivity ${hssrc} ${hsdst} ${tid} 391 log_test $? 0 "Hosts connectivity: hs-t${tid}-${hssrc} -> hs-t${tid}-${hsdst} (tenant ${tid})" 392} 393 394check_and_log_hs_isolation() 395{ 396 local hssrc=$1 397 local tidsrc=$2 398 local hsdst=$3 399 local tiddst=$4 400 401 check_hs_connectivity ${hssrc} ${hsdst} ${tidsrc} 402 # NOTE: ping should fail 403 log_test $? 1 "Hosts isolation: hs-t${tidsrc}-${hssrc} -X-> hs-t${tiddst}-${hsdst}" 404} 405 406 407check_and_log_hs2gw_connectivity() 408{ 409 local hssrc=$1 410 local tid=$2 411 412 check_hs_connectivity ${hssrc} 254 ${tid} 413 log_test $? 0 "Hosts connectivity: hs-t${tid}-${hssrc} -> gw (tenant ${tid})" 414} 415 416router_tests() 417{ 418 log_section "IPv6 routers connectivity test" 419 420 check_and_log_rt_connectivity 1 2 421 check_and_log_rt_connectivity 2 1 422} 423 424host2gateway_tests() 425{ 426 log_section "IPv6 connectivity test among hosts and gateway" 427 428 check_and_log_hs2gw_connectivity 1 100 429 check_and_log_hs2gw_connectivity 2 100 430 431 check_and_log_hs2gw_connectivity 3 200 432 check_and_log_hs2gw_connectivity 4 200 433} 434 435host_vpn_tests() 436{ 437 log_section "SRv6 VPN connectivity test among hosts in the same tenant" 438 439 check_and_log_hs_connectivity 1 2 100 440 check_and_log_hs_connectivity 2 1 100 441 442 check_and_log_hs_connectivity 3 4 200 443 check_and_log_hs_connectivity 4 3 200 444} 445 446host_vpn_isolation_tests() 447{ 448 local i 449 local j 450 local k 451 local tmp 452 local l1="1 2" 453 local l2="3 4" 454 local t1=100 455 local t2=200 456 457 log_section "SRv6 VPN isolation test among hosts in different tentants" 458 459 for k in 0 1; do 460 for i in ${l1}; do 461 for j in ${l2}; do 462 check_and_log_hs_isolation ${i} ${t1} ${j} ${t2} 463 done 464 done 465 466 # let us test the reverse path 467 tmp="${l1}"; l1="${l2}"; l2="${tmp}" 468 tmp=${t1}; t1=${t2}; t2=${tmp} 469 done 470} 471 472if [ "$(id -u)" -ne 0 ];then 473 echo "SKIP: Need root privileges" 474 exit $ksft_skip 475fi 476 477if [ ! -x "$(command -v ip)" ]; then 478 echo "SKIP: Could not run test without ip tool" 479 exit $ksft_skip 480fi 481 482modprobe vrf &>/dev/null 483if [ ! -e /proc/sys/net/vrf/strict_mode ]; then 484 echo "SKIP: vrf sysctl does not exist" 485 exit $ksft_skip 486fi 487 488cleanup &>/dev/null 489 490setup 491 492router_tests 493host2gateway_tests 494host_vpn_tests 495host_vpn_isolation_tests 496 497print_log_test_results 498 499cleanup &>/dev/null 500 501exit ${ret} 502