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# 165 166# Kselftest framework requirement - SKIP code is 4. 167ksft_skip=4 168 169readonly LOCALSID_TABLE_ID=90 170readonly IPv6_RT_NETWORK=fd00 171readonly IPv4_HS_NETWORK=10.0.0 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 # destroy routers rt-* and hosts hs-* 223 for ns in $(ip netns show | grep -E 'rt-*|hs-*'); do 224 ip netns del ${ns} || true 225 done 226} 227 228# Setup the basic networking for the routers 229setup_rt_networking() 230{ 231 local rt=$1 232 local nsname=rt-${rt} 233 234 ip netns add ${nsname} 235 ip link set veth-rt-${rt} netns ${nsname} 236 ip -netns ${nsname} link set veth-rt-${rt} name veth0 237 238 ip -netns ${nsname} addr add ${IPv6_RT_NETWORK}::${rt}/64 dev veth0 239 ip -netns ${nsname} link set veth0 up 240 ip -netns ${nsname} link set lo up 241 242 ip netns exec ${nsname} sysctl -wq net.ipv4.ip_forward=1 243 ip netns exec ${nsname} sysctl -wq net.ipv6.conf.all.forwarding=1 244} 245 246setup_hs() 247{ 248 local hs=$1 249 local rt=$2 250 local tid=$3 251 local hsname=hs-t${tid}-${hs} 252 local rtname=rt-${rt} 253 local rtveth=veth-t${tid} 254 255 # set the networking for the host 256 ip netns add ${hsname} 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 ${IPv4_HS_NETWORK}.${hs}/24 dev veth0 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 # enslave the veth-tX interface to the vrf-X in the access router 269 ip -netns ${rtname} link set ${rtveth} master vrf-${tid} 270 ip -netns ${rtname} addr add ${IPv4_HS_NETWORK}.254/24 dev ${rtveth} 271 ip -netns ${rtname} link set ${rtveth} up 272 273 ip netns exec ${rtname} sysctl -wq net.ipv4.conf.${rtveth}.proxy_arp=1 274 275 # disable the rp_filter otherwise the kernel gets confused about how 276 # to route decap ipv4 packets. 277 ip netns exec ${rtname} sysctl -wq net.ipv4.conf.all.rp_filter=0 278 ip netns exec ${rtname} sysctl -wq net.ipv4.conf.${rtveth}.rp_filter=0 279 280 ip netns exec ${rtname} sh -c "echo 1 > /proc/sys/net/vrf/strict_mode" 281} 282 283setup_vpn_config() 284{ 285 local hssrc=$1 286 local rtsrc=$2 287 local hsdst=$3 288 local rtdst=$4 289 local tid=$5 290 291 local hssrc_name=hs-t${tid}-${hssrc} 292 local hsdst_name=hs-t${tid}-${hsdst} 293 local rtsrc_name=rt-${rtsrc} 294 local rtdst_name=rt-${rtdst} 295 local vpn_sid=${VPN_LOCATOR_SERVICE}:${hssrc}${hsdst}:${tid}::6004 296 297 # set the encap route for encapsulating packets which arrive from the 298 # host hssrc and destined to the access router rtsrc. 299 ip -netns ${rtsrc_name} -4 route add ${IPv4_HS_NETWORK}.${hsdst}/32 vrf vrf-${tid} \ 300 encap seg6 mode encap segs ${vpn_sid} dev veth0 301 ip -netns ${rtsrc_name} -6 route add ${vpn_sid}/128 vrf vrf-${tid} \ 302 via fd00::${rtdst} dev veth0 303 304 # set the decap route for decapsulating packets which arrive from 305 # the rtdst router and destined to the hsdst host. 306 ip -netns ${rtdst_name} -6 route add ${vpn_sid}/128 table ${LOCALSID_TABLE_ID} \ 307 encap seg6local action End.DT4 vrftable ${tid} dev vrf-${tid} 308 309 # all sids for VPNs start with a common locator which is fc00::/16. 310 # Routes for handling the SRv6 End.DT4 behavior instances are grouped 311 # together in the 'localsid' table. 312 # 313 # NOTE: added only once 314 if [ -z "$(ip -netns ${rtdst_name} -6 rule show | \ 315 grep "to ${VPN_LOCATOR_SERVICE}::/16 lookup ${LOCALSID_TABLE_ID}")" ]; then 316 ip -netns ${rtdst_name} -6 rule add \ 317 to ${VPN_LOCATOR_SERVICE}::/16 \ 318 lookup ${LOCALSID_TABLE_ID} prio 999 319 fi 320} 321 322setup() 323{ 324 ip link add veth-rt-1 type veth peer name veth-rt-2 325 # setup the networking for router rt-1 and router 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_hs 1 1 100 #args: host router tenant 333 setup_hs 2 2 100 334 335 # setup two hosts for the tenant 200 336 # - host hs-3 is directly connected to the router rt-1; 337 # - host hs-4 is directly connected to the router rt-2. 338 setup_hs 3 1 200 339 setup_hs 4 2 200 340 341 # setup the IPv4 L3 VPN which connects the host hs-t100-1 and host 342 # hs-t100-2 within the same tenant 100. 343 setup_vpn_config 1 1 2 2 100 #args: src_host src_router dst_host dst_router tenant 344 setup_vpn_config 2 2 1 1 100 345 346 # setup the IPv4 L3 VPN which connects the host hs-t200-3 and host 347 # hs-t200-4 within the same tenant 200. 348 setup_vpn_config 3 1 4 2 200 349 setup_vpn_config 4 2 3 1 200 350} 351 352check_rt_connectivity() 353{ 354 local rtsrc=$1 355 local rtdst=$2 356 357 ip netns exec rt-${rtsrc} ping -c 1 -W 1 ${IPv6_RT_NETWORK}::${rtdst} \ 358 >/dev/null 2>&1 359} 360 361check_and_log_rt_connectivity() 362{ 363 local rtsrc=$1 364 local rtdst=$2 365 366 check_rt_connectivity ${rtsrc} ${rtdst} 367 log_test $? 0 "Routers connectivity: rt-${rtsrc} -> rt-${rtdst}" 368} 369 370check_hs_connectivity() 371{ 372 local hssrc=$1 373 local hsdst=$2 374 local tid=$3 375 376 ip netns exec hs-t${tid}-${hssrc} ping -c 1 -W ${PING_TIMEOUT_SEC} \ 377 ${IPv4_HS_NETWORK}.${hsdst} >/dev/null 2>&1 378} 379 380check_and_log_hs_connectivity() 381{ 382 local hssrc=$1 383 local hsdst=$2 384 local tid=$3 385 386 check_hs_connectivity ${hssrc} ${hsdst} ${tid} 387 log_test $? 0 "Hosts connectivity: hs-t${tid}-${hssrc} -> hs-t${tid}-${hsdst} (tenant ${tid})" 388} 389 390check_and_log_hs_isolation() 391{ 392 local hssrc=$1 393 local tidsrc=$2 394 local hsdst=$3 395 local tiddst=$4 396 397 check_hs_connectivity ${hssrc} ${hsdst} ${tidsrc} 398 # NOTE: ping should fail 399 log_test $? 1 "Hosts isolation: hs-t${tidsrc}-${hssrc} -X-> hs-t${tiddst}-${hsdst}" 400} 401 402 403check_and_log_hs2gw_connectivity() 404{ 405 local hssrc=$1 406 local tid=$2 407 408 check_hs_connectivity ${hssrc} 254 ${tid} 409 log_test $? 0 "Hosts connectivity: hs-t${tid}-${hssrc} -> gw (tenant ${tid})" 410} 411 412router_tests() 413{ 414 log_section "IPv6 routers connectivity test" 415 416 check_and_log_rt_connectivity 1 2 417 check_and_log_rt_connectivity 2 1 418} 419 420host2gateway_tests() 421{ 422 log_section "IPv4 connectivity test among hosts and gateway" 423 424 check_and_log_hs2gw_connectivity 1 100 425 check_and_log_hs2gw_connectivity 2 100 426 427 check_and_log_hs2gw_connectivity 3 200 428 check_and_log_hs2gw_connectivity 4 200 429} 430 431host_vpn_tests() 432{ 433 log_section "SRv6 VPN connectivity test among hosts in the same tenant" 434 435 check_and_log_hs_connectivity 1 2 100 436 check_and_log_hs_connectivity 2 1 100 437 438 check_and_log_hs_connectivity 3 4 200 439 check_and_log_hs_connectivity 4 3 200 440} 441 442host_vpn_isolation_tests() 443{ 444 local i 445 local j 446 local k 447 local tmp 448 local l1="1 2" 449 local l2="3 4" 450 local t1=100 451 local t2=200 452 453 log_section "SRv6 VPN isolation test among hosts in different tentants" 454 455 for k in 0 1; do 456 for i in ${l1}; do 457 for j in ${l2}; do 458 check_and_log_hs_isolation ${i} ${t1} ${j} ${t2} 459 done 460 done 461 462 # let us test the reverse path 463 tmp="${l1}"; l1="${l2}"; l2="${tmp}" 464 tmp=${t1}; t1=${t2}; t2=${tmp} 465 done 466} 467 468if [ "$(id -u)" -ne 0 ];then 469 echo "SKIP: Need root privileges" 470 exit $ksft_skip 471fi 472 473if [ ! -x "$(command -v ip)" ]; then 474 echo "SKIP: Could not run test without ip tool" 475 exit $ksft_skip 476fi 477 478modprobe vrf &>/dev/null 479if [ ! -e /proc/sys/net/vrf/strict_mode ]; then 480 echo "SKIP: vrf sysctl does not exist" 481 exit $ksft_skip 482fi 483 484cleanup &>/dev/null 485 486setup 487 488router_tests 489host2gateway_tests 490host_vpn_tests 491host_vpn_isolation_tests 492 493print_log_test_results 494 495cleanup &>/dev/null 496 497exit ${ret} 498