tools/testing/selftests/net/srv6_end_dt6_l3vpn_test.sh

   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
 167 readonly LOCALSID_TABLE_ID=90
 168 readonly IPv6_RT_NETWORK=fd00
 169 readonly IPv6_HS_NETWORK=cafe
 170 readonly VPN_LOCATOR_SERVICE=fc00
 171 PING_TIMEOUT_SEC=4
 172
 173 ret=0
 174
 175 PAUSE_ON_FAIL=${PAUSE_ON_FAIL:=no}
 176
 177 log_test()
 178 {
 179         local rc=$1
 180         local expected=$2
 181         local msg="$3"
 182
 183         if [ ${rc} -eq ${expected} ]; then
 184                 nsuccess=$((nsuccess+1))
 185                 printf "\n    TEST: %-60s  [ OK ]\n" "${msg}"
 186         else
 187                 ret=1
 188                 nfail=$((nfail+1))
 189                 printf "\n    TEST: %-60s  [FAIL]\n" "${msg}"
 190                 if [ "${PAUSE_ON_FAIL}" = "yes" ]; then
 191                         echo
 192                         echo "hit enter to continue, 'q' to quit"
 193                         read a
 194                         [ "$a" = "q" ] && exit 1
 195                 fi
 196         fi
 197 }
 198
 199 print_log_test_results()
 200 {
 201         if [ "$TESTS" != "none" ]; then
 202                 printf "\nTests passed: %3d\n" ${nsuccess}
 203                 printf "Tests failed: %3d\n"   ${nfail}
 204         fi
 205 }
 206
 207 log_section()
 208 {
 209         echo
 210         echo "################################################################################"
 211         echo "TEST SECTION: $*"
 212         echo "################################################################################"
 213 }
 214
 215 cleanup()
 216 {
 217         ip link del veth-rt-1 2>/dev/null || true
 218         ip link del veth-rt-2 2>/dev/null || true
 219
 220         # destroy routers rt-* and hosts hs-*
 221         for ns in $(ip netns show | grep -E 'rt-*|hs-*'); do
 222                 ip netns del ${ns} || true
 223         done
 224 }
 225
 226 # Setup the basic networking for the routers
 227 setup_rt_networking()
 228 {
 229         local rt=$1
 230         local nsname=rt-${rt}
 231
 232         ip netns add ${nsname}
 233         ip link set veth-rt-${rt} netns ${nsname}
 234         ip -netns ${nsname} link set veth-rt-${rt} name veth0
 235
 236         ip netns exec ${nsname} sysctl -wq net.ipv6.conf.all.accept_dad=0
 237         ip netns exec ${nsname} sysctl -wq net.ipv6.conf.default.accept_dad=0
 238
 239         ip -netns ${nsname} addr add ${IPv6_RT_NETWORK}::${rt}/64 dev veth0 nodad
 240         ip -netns ${nsname} link set veth0 up
 241         ip -netns ${nsname} link set lo up
 242
 243         ip netns exec ${nsname} sysctl -wq net.ipv6.conf.all.forwarding=1
 244 }
 245
 246 setup_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
 258         ip netns exec ${hsname} sysctl -wq net.ipv6.conf.all.accept_dad=0
 259         ip netns exec ${hsname} sysctl -wq net.ipv6.conf.default.accept_dad=0
 260
 261         ip -netns ${hsname} link add veth0 type veth peer name ${rtveth}
 262         ip -netns ${hsname} link set ${rtveth} netns ${rtname}
 263         ip -netns ${hsname} addr add ${IPv6_HS_NETWORK}::${hs}/64 dev veth0 nodad
 264         ip -netns ${hsname} link set veth0 up
 265         ip -netns ${hsname} link set lo up
 266
 267         # configure the VRF for the tenant X on the router which is directly
 268         # connected to the source host.
 269         ip -netns ${rtname} link add vrf-${tid} type vrf table ${tid}
 270         ip -netns ${rtname} link set vrf-${tid} up
 271
 272         ip netns exec ${rtname} sysctl -wq net.ipv6.conf.all.accept_dad=0
 273         ip netns exec ${rtname} sysctl -wq net.ipv6.conf.default.accept_dad=0
 274
 275         # enslave the veth-tX interface to the vrf-X in the access router
 276         ip -netns ${rtname} link set ${rtveth} master vrf-${tid}
 277         ip -netns ${rtname} addr add ${IPv6_HS_NETWORK}::254/64 dev ${rtveth} nodad
 278         ip -netns ${rtname} link set ${rtveth} up
 279
 280         ip netns exec ${rtname} sysctl -wq net.ipv6.conf.${rtveth}.proxy_ndp=1
 281
 282         ip netns exec ${rtname} sh -c "echo 1 > /proc/sys/net/vrf/strict_mode"
 283 }
 284
 285 setup_vpn_config()
 286 {
 287         local hssrc=$1
 288         local rtsrc=$2
 289         local hsdst=$3
 290         local rtdst=$4
 291         local tid=$5
 292
 293         local hssrc_name=hs-t${tid}-${hssrc}
 294         local hsdst_name=hs-t${tid}-${hsdst}
 295         local rtsrc_name=rt-${rtsrc}
 296         local rtdst_name=rt-${rtdst}
 297         local rtveth=veth-t${tid}
 298         local vpn_sid=${VPN_LOCATOR_SERVICE}:${hssrc}${hsdst}:${tid}::6006
 299
 300         ip -netns ${rtsrc_name} -6 neigh add proxy ${IPv6_HS_NETWORK}::${hsdst} dev ${rtveth}
 301
 302         # set the encap route for encapsulating packets which arrive from the
 303         # host hssrc and destined to the access router rtsrc.
 304         ip -netns ${rtsrc_name} -6 route add ${IPv6_HS_NETWORK}::${hsdst}/128 vrf vrf-${tid} \
 305                 encap seg6 mode encap segs ${vpn_sid} dev veth0
 306         ip -netns ${rtsrc_name} -6 route add ${vpn_sid}/128 vrf vrf-${tid} \
 307                 via fd00::${rtdst} dev veth0
 308
 309         # set the decap route for decapsulating packets which arrive from
 310         # the rtdst router and destined to the hsdst host.
 311         ip -netns ${rtdst_name} -6 route add ${vpn_sid}/128 table ${LOCALSID_TABLE_ID} \
 312                 encap seg6local action End.DT6 vrftable ${tid} dev vrf-${tid}
 313
 314         # all sids for VPNs start with a common locator which is fc00::/16.
 315         # Routes for handling the SRv6 End.DT6 behavior instances are grouped
 316         # together in the 'localsid' table.
 317         #
 318         # NOTE: added only once
 319         if [ -z "$(ip -netns ${rtdst_name} -6 rule show | \
 320             grep "to ${VPN_LOCATOR_SERVICE}::/16 lookup ${LOCALSID_TABLE_ID}")" ]; then
 321                 ip -netns ${rtdst_name} -6 rule add \
 322                         to ${VPN_LOCATOR_SERVICE}::/16 \
 323                         lookup ${LOCALSID_TABLE_ID} prio 999
 324         fi
 325 }
 326
 327 setup()
 328 {
 329         ip link add veth-rt-1 type veth peer name veth-rt-2
 330         # setup the networking for router rt-1 and router rt-2
 331         setup_rt_networking 1
 332         setup_rt_networking 2
 333
 334         # setup two hosts for the tenant 100.
 335         #  - host hs-1 is directly connected to the router rt-1;
 336         #  - host hs-2 is directly connected to the router rt-2.
 337         setup_hs 1 1 100  #args: host router tenant
 338         setup_hs 2 2 100
 339
 340         # setup two hosts for the tenant 200
 341         #  - host hs-3 is directly connected to the router rt-1;
 342         #  - host hs-4 is directly connected to the router rt-2.
 343         setup_hs 3 1 200
 344         setup_hs 4 2 200
 345
 346         # setup the IPv6 L3 VPN which connects the host hs-t100-1 and host
 347         # hs-t100-2 within the same tenant 100.
 348         setup_vpn_config 1 1 2 2 100  #args: src_host src_router dst_host dst_router tenant
 349         setup_vpn_config 2 2 1 1 100
 350
 351         # setup the IPv6 L3 VPN which connects the host hs-t200-3 and host
 352         # hs-t200-4 within the same tenant 200.
 353         setup_vpn_config 3 1 4 2 200
 354         setup_vpn_config 4 2 3 1 200
 355 }
 356
 357 check_rt_connectivity()
 358 {
 359         local rtsrc=$1
 360         local rtdst=$2
 361
 362         ip netns exec rt-${rtsrc} ping -c 1 -W 1 ${IPv6_RT_NETWORK}::${rtdst} \
 363                 >/dev/null 2>&1
 364 }
 365
 366 check_and_log_rt_connectivity()
 367 {
 368         local rtsrc=$1
 369         local rtdst=$2
 370
 371         check_rt_connectivity ${rtsrc} ${rtdst}
 372         log_test $? 0 "Routers connectivity: rt-${rtsrc} -> rt-${rtdst}"
 373 }
 374
 375 check_hs_connectivity()
 376 {
 377         local hssrc=$1
 378         local hsdst=$2
 379         local tid=$3
 380
 381         ip netns exec hs-t${tid}-${hssrc} ping -c 1 -W ${PING_TIMEOUT_SEC} \
 382                 ${IPv6_HS_NETWORK}::${hsdst} >/dev/null 2>&1
 383 }
 384
 385 check_and_log_hs_connectivity()
 386 {
 387         local hssrc=$1
 388         local hsdst=$2
 389         local tid=$3
 390
 391         check_hs_connectivity ${hssrc} ${hsdst} ${tid}
 392         log_test $? 0 "Hosts connectivity: hs-t${tid}-${hssrc} -> hs-t${tid}-${hsdst} (tenant ${tid})"
 393 }
 394
 395 check_and_log_hs_isolation()
 396 {
 397         local hssrc=$1
 398         local tidsrc=$2
 399         local hsdst=$3
 400         local tiddst=$4
 401
 402         check_hs_connectivity ${hssrc} ${hsdst} ${tidsrc}
 403         # NOTE: ping should fail
 404         log_test $? 1 "Hosts isolation: hs-t${tidsrc}-${hssrc} -X-> hs-t${tiddst}-${hsdst}"
 405 }
 406
 407
 408 check_and_log_hs2gw_connectivity()
 409 {
 410         local hssrc=$1
 411         local tid=$2
 412
 413         check_hs_connectivity ${hssrc} 254 ${tid}
 414         log_test $? 0 "Hosts connectivity: hs-t${tid}-${hssrc} -> gw (tenant ${tid})"
 415 }
 416
 417 router_tests()
 418 {
 419         log_section "IPv6 routers connectivity test"
 420
 421         check_and_log_rt_connectivity 1 2
 422         check_and_log_rt_connectivity 2 1
 423 }
 424
 425 host2gateway_tests()
 426 {
 427         log_section "IPv6 connectivity test among hosts and gateway"
 428
 429         check_and_log_hs2gw_connectivity 1 100
 430         check_and_log_hs2gw_connectivity 2 100
 431
 432         check_and_log_hs2gw_connectivity 3 200
 433         check_and_log_hs2gw_connectivity 4 200
 434 }
 435
 436 host_vpn_tests()
 437 {
 438         log_section "SRv6 VPN connectivity test among hosts in the same tenant"
 439
 440         check_and_log_hs_connectivity 1 2 100
 441         check_and_log_hs_connectivity 2 1 100
 442
 443         check_and_log_hs_connectivity 3 4 200
 444         check_and_log_hs_connectivity 4 3 200
 445 }
 446
 447 host_vpn_isolation_tests()
 448 {
 449         local i
 450         local j
 451         local k
 452         local tmp
 453         local l1="1 2"
 454         local l2="3 4"
 455         local t1=100
 456         local t2=200
 457
 458         log_section "SRv6 VPN isolation test among hosts in different tentants"
 459
 460         for k in 0 1; do
 461                 for i in ${l1}; do
 462                         for j in ${l2}; do
 463                                 check_and_log_hs_isolation ${i} ${t1} ${j} ${t2}
 464                         done
 465                 done
 466
 467                 # let us test the reverse path
 468                 tmp="${l1}"; l1="${l2}"; l2="${tmp}"
 469                 tmp=${t1}; t1=${t2}; t2=${tmp}
 470         done
 471 }
 472
 473 if [ "$(id -u)" -ne 0 ];then
 474         echo "SKIP: Need root privileges"
 475         exit 0
 476 fi
 477
 478 if [ ! -x "$(command -v ip)" ]; then
 479         echo "SKIP: Could not run test without ip tool"
 480         exit 0
 481 fi
 482
 483 modprobe vrf &>/dev/null
 484 if [ ! -e /proc/sys/net/vrf/strict_mode ]; then
 485         echo "SKIP: vrf sysctl does not exist"
 486         exit 0
 487 fi
 488
 489 cleanup &>/dev/null
 490
 491 setup
 492
 493 router_tests
 494 host2gateway_tests
 495 host_vpn_tests
 496 host_vpn_isolation_tests
 497
 498 print_log_test_results
 499
 500 cleanup &>/dev/null
 501
 502 exit ${ret}