497 lines · bash
1#!/bin/bash2# SPDX-License-Identifier: GPL-2.03#4# author: Andrea Mayer <andrea.mayer@uniroma2.it>5 6# This test is designed for evaluating the new SRv6 End.DT4 behavior used for7# implementing IPv4 L3 VPN use cases.8#9# Hereafter a network diagram is shown, where two different tenants (named 10010# and 200) offer IPv4 L3 VPN services allowing hosts to communicate with each11# other across an IPv6 network.12#13# Only hosts belonging to the same tenant (and to the same VPN) can communicate14# with each other. Instead, the communication among hosts of different tenants15# is forbidden.16# In other words, hosts hs-t100-1 and hs-t100-2 are connected through the IPv417# L3 VPN of tenant 100 while hs-t200-3 and hs-t200-4 are connected using the18# IPv4 L3 VPN of tenant 200. Cross connection between tenant 100 and tenant 20019# is forbidden and thus, for example, hs-t100-1 cannot reach hs-t200-3 and vice20# versa.21#22# Routers rt-1 and rt-2 implement IPv4 L3 VPN services leveraging the SRv623# 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 an27# example where, within the same domain of tenant 100, the host hs-t100-1 pings28# the host hs-t100-2.29#30# First of all, L2 reachability of the host hs-t100-2 is taken into account by31# 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, the34# router rt-1 receives the packet on the internal veth-t100 interface. Such35# interface is enslaved to the VRF vrf-100 whose associated table contains the36# SRv6 Encap route for encapsulating any IPv4 packet in a IPv6 plus the Segment37# Routing Header (SRH) packet. This packet is sent through the (IPv6) core38# 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 incoming41# IPv6+SRH packets which belong to the VPN of the tenant 100. For each of these42# packets, the SRv6 End.DT4 behavior removes the outer IPv6+SRH headers and43# performs the lookup on the vrf-100 table using the destination address of44# the decapsulated IPv4 packet. Afterwards, the packet is sent to the host45# hs-t100-2 through the veth-t100 interface.46#47# The ping response follows the same processing but this time the role of rt-148# and rt-2 are swapped.49#50# Of course, the IPv4 L3 VPN for tenant 200 works exactly as the IPv4 L3 VPN51# for tenant 100. In this case, only hosts hs-t200-3 and hs-t200-4 are able to52# 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.sh167 168readonly LOCALSID_TABLE_ID=90169readonly IPv6_RT_NETWORK=fd00170readonly IPv4_HS_NETWORK=10.0.0171readonly VPN_LOCATOR_SERVICE=fc00172PING_TIMEOUT_SEC=4173 174ret=0175 176PAUSE_ON_FAIL=${PAUSE_ON_FAIL:=no}177 178log_test()179{180 local rc=$1181 local expected=$2182 local msg="$3"183 184 if [ ${rc} -eq ${expected} ]; then185 nsuccess=$((nsuccess+1))186 printf "\n TEST: %-60s [ OK ]\n" "${msg}"187 else188 ret=1189 nfail=$((nfail+1))190 printf "\n TEST: %-60s [FAIL]\n" "${msg}"191 if [ "${PAUSE_ON_FAIL}" = "yes" ]; then192 echo193 echo "hit enter to continue, 'q' to quit"194 read a195 [ "$a" = "q" ] && exit 1196 fi197 fi198}199 200print_log_test_results()201{202 if [ "$TESTS" != "none" ]; then203 printf "\nTests passed: %3d\n" ${nsuccess}204 printf "Tests failed: %3d\n" ${nfail}205 fi206}207 208log_section()209{210 echo211 echo "################################################################################"212 echo "TEST SECTION: $*"213 echo "################################################################################"214}215 216cleanup()217{218 ip link del veth-rt-1 2>/dev/null || true219 ip link del veth-rt-2 2>/dev/null || true220 221 cleanup_all_ns222}223 224# Setup the basic networking for the routers225setup_rt_networking()226{227 local id=$1228 eval local nsname=\${rt_${id}}229 230 ip netns exec ${nsname} sysctl -wq net.ipv6.conf.all.accept_dad=0231 ip netns exec ${nsname} sysctl -wq net.ipv6.conf.default.accept_dad=0232 233 ip link set veth-rt-${id} netns ${nsname}234 ip -netns ${nsname} link set veth-rt-${id} name veth0235 236 ip -netns ${nsname} addr add ${IPv6_RT_NETWORK}::${id}/64 dev veth0 nodad237 ip -netns ${nsname} link set veth0 up238 ip -netns ${nsname} link set lo up239 240 ip netns exec ${nsname} sysctl -wq net.ipv4.ip_forward=1241 ip netns exec ${nsname} sysctl -wq net.ipv6.conf.all.forwarding=1242}243 244setup_hs()245{246 local hid=$1247 local rid=$2248 local tid=$3249 eval local hsname=\${hs_t${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 how254 # to route decap ipv4 packets.255 ip netns exec ${rtname} sysctl -wq net.ipv4.conf.all.rp_filter=0256 ip netns exec ${rtname} sysctl -wq net.ipv4.conf.default.rp_filter=0257 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 veth0261 ip -netns ${hsname} link set veth0 up262 ip -netns ${hsname} link set lo up263 264 # configure the VRF for the tenant X on the router which is directly265 # 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} up268 269 # enslave the veth-tX interface to the vrf-X in the access router270 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} up273 274 ip netns exec ${rtname} sysctl -wq net.ipv4.conf.${rtveth}.proxy_arp=1275 276 ip netns exec ${rtname} sh -c "echo 1 > /proc/sys/net/vrf/strict_mode"277}278 279setup_vpn_config()280{281 local hssrc=$1282 local rtsrc=$2283 local hsdst=$3284 local rtdst=$4285 local tid=$5286 287 eval local rtsrc_name=\${rt_${rtsrc}}288 eval local rtdst_name=\${rt_${rtdst}}289 local vpn_sid=${VPN_LOCATOR_SERVICE}:${hssrc}${hsdst}:${tid}::6004290 291 # set the encap route for encapsulating packets which arrive from the292 # 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 veth0295 ip -netns ${rtsrc_name} -6 route add ${vpn_sid}/128 vrf vrf-${tid} \296 via fd00::${rtdst} dev veth0297 298 # set the decap route for decapsulating packets which arrive from299 # 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 grouped305 # together in the 'localsid' table.306 #307 # NOTE: added only once308 if [ -z "$(ip -netns ${rtdst_name} -6 rule show | \309 grep "to ${VPN_LOCATOR_SERVICE}::/16 lookup ${LOCALSID_TABLE_ID}")" ]; then310 ip -netns ${rtdst_name} -6 rule add \311 to ${VPN_LOCATOR_SERVICE}::/16 \312 lookup ${LOCALSID_TABLE_ID} prio 999313 fi314}315 316setup()317{318 ip link add veth-rt-1 type veth peer name veth-rt-2319 # setup the networking for router rt-1 and router rt-2320 setup_ns rt_1 rt_2321 setup_rt_networking 1322 setup_rt_networking 2323 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_2328 setup_hs 1 1 100 #args: host router tenant329 setup_hs 2 2 100330 331 # setup two hosts for the tenant 200332 # - 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_4335 setup_hs 3 1 200336 setup_hs 4 2 200337 338 # setup the IPv4 L3 VPN which connects the host hs-t100-1 and host339 # 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 tenant341 setup_vpn_config 2 2 1 1 100342 343 # setup the IPv4 L3 VPN which connects the host hs-t200-3 and host344 # hs-t200-4 within the same tenant 200.345 setup_vpn_config 3 1 4 2 200346 setup_vpn_config 4 2 3 1 200347}348 349check_rt_connectivity()350{351 local rtsrc=$1352 local rtdst=$2353 eval local nsname=\${rt_${rtsrc}}354 355 ip netns exec ${nsname} ping -c 1 -W 1 ${IPv6_RT_NETWORK}::${rtdst} \356 >/dev/null 2>&1357}358 359check_and_log_rt_connectivity()360{361 local rtsrc=$1362 local rtdst=$2363 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=$1371 local hsdst=$2372 local tid=$3373 eval local nsname=\${hs_t${tid}_${hssrc}}374 375 ip netns exec ${nsname} ping -c 1 -W ${PING_TIMEOUT_SEC} \376 ${IPv4_HS_NETWORK}.${hsdst} >/dev/null 2>&1377}378 379check_and_log_hs_connectivity()380{381 local hssrc=$1382 local hsdst=$2383 local tid=$3384 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=$1392 local tidsrc=$2393 local hsdst=$3394 local tiddst=$4395 396 check_hs_connectivity ${hssrc} ${hsdst} ${tidsrc}397 # NOTE: ping should fail398 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=$1405 local tid=$2406 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 2416 check_and_log_rt_connectivity 2 1417}418 419host2gateway_tests()420{421 log_section "IPv4 connectivity test among hosts and gateway"422 423 check_and_log_hs2gw_connectivity 1 100424 check_and_log_hs2gw_connectivity 2 100425 426 check_and_log_hs2gw_connectivity 3 200427 check_and_log_hs2gw_connectivity 4 200428}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 100435 check_and_log_hs_connectivity 2 1 100436 437 check_and_log_hs_connectivity 3 4 200438 check_and_log_hs_connectivity 4 3 200439}440 441host_vpn_isolation_tests()442{443 local i444 local j445 local k446 local tmp447 local l1="1 2"448 local l2="3 4"449 local t1=100450 local t2=200451 452 log_section "SRv6 VPN isolation test among hosts in different tentants"453 454 for k in 0 1; do455 for i in ${l1}; do456 for j in ${l2}; do457 check_and_log_hs_isolation ${i} ${t1} ${j} ${t2}458 done459 done460 461 # let us test the reverse path462 tmp="${l1}"; l1="${l2}"; l2="${tmp}"463 tmp=${t1}; t1=${t2}; t2=${tmp}464 done465}466 467if [ "$(id -u)" -ne 0 ];then468 echo "SKIP: Need root privileges"469 exit $ksft_skip470fi471 472if [ ! -x "$(command -v ip)" ]; then473 echo "SKIP: Could not run test without ip tool"474 exit $ksft_skip475fi476 477modprobe vrf &>/dev/null478if [ ! -e /proc/sys/net/vrf/strict_mode ]; then479 echo "SKIP: vrf sysctl does not exist"480 exit $ksft_skip481fi482 483cleanup &>/dev/null484 485setup486 487router_tests488host2gateway_tests489host_vpn_tests490host_vpn_isolation_tests491 492print_log_test_results493 494cleanup &>/dev/null495 496exit ${ret}497