tools/testing/selftests/net/srv6_end_dt4_l3vpn_test.sh

   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 readonly LOCALSID_TABLE_ID=90
 167 readonly IPv6_RT_NETWORK=fd00
 168 readonly IPv4_HS_NETWORK=10.0.0
 169 readonly VPN_LOCATOR_SERVICE=fc00
 170 PING_TIMEOUT_SEC=4
 171
 172 ret=0
 173
 174 PAUSE_ON_FAIL=${PAUSE_ON_FAIL:=no}
 175
 176 log_test()
 177 {
 178         local rc=$1
 179         local expected=$2
 180         local msg="$3"
 181
 182         if [ ${rc} -eq ${expected} ]; then
 183                 nsuccess=$((nsuccess+1))
 184                 printf "\n    TEST: %-60s  [ OK ]\n" "${msg}"
 185         else
 186                 ret=1
 187                 nfail=$((nfail+1))
 188                 printf "\n    TEST: %-60s  [FAIL]\n" "${msg}"
 189                 if [ "${PAUSE_ON_FAIL}" = "yes" ]; then
 190                         echo
 191                         echo "hit enter to continue, 'q' to quit"
 192                         read a
 193                         [ "$a" = "q" ] && exit 1
 194                 fi
 195         fi
 196 }
 197
 198 print_log_test_results()
 199 {
 200         if [ "$TESTS" != "none" ]; then
 201                 printf "\nTests passed: %3d\n" ${nsuccess}
 202                 printf "Tests failed: %3d\n"   ${nfail}
 203         fi
 204 }
 205
 206 log_section()
 207 {
 208         echo
 209         echo "################################################################################"
 210         echo "TEST SECTION: $*"
 211         echo "################################################################################"
 212 }
 213
 214 cleanup()
 215 {
 216         ip link del veth-rt-1 2>/dev/null || true
 217         ip link del veth-rt-2 2>/dev/null || true
 218
 219         # destroy routers rt-* and hosts hs-*
 220         for ns in $(ip netns show | grep -E 'rt-*|hs-*'); do
 221                 ip netns del ${ns} || true
 222         done
 223 }
 224
 225 # Setup the basic networking for the routers
 226 setup_rt_networking()
 227 {
 228         local rt=$1
 229         local nsname=rt-${rt}
 230
 231         ip netns add ${nsname}
 232         ip link set veth-rt-${rt} netns ${nsname}
 233         ip -netns ${nsname} link set veth-rt-${rt} name veth0
 234
 235         ip -netns ${nsname} addr add ${IPv6_RT_NETWORK}::${rt}/64 dev veth0
 236         ip -netns ${nsname} link set veth0 up
 237         ip -netns ${nsname} link set lo up
 238
 239         ip netns exec ${nsname} sysctl -wq net.ipv4.ip_forward=1
 240         ip netns exec ${nsname} sysctl -wq net.ipv6.conf.all.forwarding=1
 241 }
 242
 243 setup_hs()
 244 {
 245         local hs=$1
 246         local rt=$2
 247         local tid=$3
 248         local hsname=hs-t${tid}-${hs}
 249         local rtname=rt-${rt}
 250         local rtveth=veth-t${tid}
 251
 252         # set the networking for the host
 253         ip netns add ${hsname}
 254         ip -netns ${hsname} link add veth0 type veth peer name ${rtveth}
 255         ip -netns ${hsname} link set ${rtveth} netns ${rtname}
 256         ip -netns ${hsname} addr add ${IPv4_HS_NETWORK}.${hs}/24 dev veth0
 257         ip -netns ${hsname} link set veth0 up
 258         ip -netns ${hsname} link set lo up
 259
 260         # configure the VRF for the tenant X on the router which is directly
 261         # connected to the source host.
 262         ip -netns ${rtname} link add vrf-${tid} type vrf table ${tid}
 263         ip -netns ${rtname} link set vrf-${tid} up
 264
 265         # enslave the veth-tX interface to the vrf-X in the access router
 266         ip -netns ${rtname} link set ${rtveth} master vrf-${tid}
 267         ip -netns ${rtname} addr add ${IPv4_HS_NETWORK}.254/24 dev ${rtveth}
 268         ip -netns ${rtname} link set ${rtveth} up
 269
 270         ip netns exec ${rtname} sysctl -wq net.ipv4.conf.${rtveth}.proxy_arp=1
 271
 272         # disable the rp_filter otherwise the kernel gets confused about how
 273         # to route decap ipv4 packets.
 274         ip netns exec ${rtname} sysctl -wq net.ipv4.conf.all.rp_filter=0
 275         ip netns exec ${rtname} sysctl -wq net.ipv4.conf.${rtveth}.rp_filter=0
 276
 277         ip netns exec ${rtname} sh -c "echo 1 > /proc/sys/net/vrf/strict_mode"
 278 }
 279
 280 setup_vpn_config()
 281 {
 282         local hssrc=$1
 283         local rtsrc=$2
 284         local hsdst=$3
 285         local rtdst=$4
 286         local tid=$5
 287
 288         local hssrc_name=hs-t${tid}-${hssrc}
 289         local hsdst_name=hs-t${tid}-${hsdst}
 290         local rtsrc_name=rt-${rtsrc}
 291         local rtdst_name=rt-${rtdst}
 292         local vpn_sid=${VPN_LOCATOR_SERVICE}:${hssrc}${hsdst}:${tid}::6004
 293
 294         # set the encap route for encapsulating packets which arrive from the
 295         # host hssrc and destined to the access router rtsrc.
 296         ip -netns ${rtsrc_name} -4 route add ${IPv4_HS_NETWORK}.${hsdst}/32 vrf vrf-${tid} \
 297                 encap seg6 mode encap segs ${vpn_sid} dev veth0
 298         ip -netns ${rtsrc_name} -6 route add ${vpn_sid}/128 vrf vrf-${tid} \
 299                 via fd00::${rtdst} dev veth0
 300
 301         # set the decap route for decapsulating packets which arrive from
 302         # the rtdst router and destined to the hsdst host.
 303         ip -netns ${rtdst_name} -6 route add ${vpn_sid}/128 table ${LOCALSID_TABLE_ID} \
 304                 encap seg6local action End.DT4 vrftable ${tid} dev vrf-${tid}
 305
 306         # all sids for VPNs start with a common locator which is fc00::/16.
 307         # Routes for handling the SRv6 End.DT4 behavior instances are grouped
 308         # together in the 'localsid' table.
 309         #
 310         # NOTE: added only once
 311         if [ -z "$(ip -netns ${rtdst_name} -6 rule show | \
 312             grep "to ${VPN_LOCATOR_SERVICE}::/16 lookup ${LOCALSID_TABLE_ID}")" ]; then
 313                 ip -netns ${rtdst_name} -6 rule add \
 314                         to ${VPN_LOCATOR_SERVICE}::/16 \
 315                         lookup ${LOCALSID_TABLE_ID} prio 999
 316         fi
 317 }
 318
 319 setup()
 320 {
 321         ip link add veth-rt-1 type veth peer name veth-rt-2
 322         # setup the networking for router rt-1 and router rt-2
 323         setup_rt_networking 1
 324         setup_rt_networking 2
 325
 326         # setup two hosts for the tenant 100.
 327         #  - host hs-1 is directly connected to the router rt-1;
 328         #  - host hs-2 is directly connected to the router rt-2.
 329         setup_hs 1 1 100  #args: host router tenant
 330         setup_hs 2 2 100
 331
 332         # setup two hosts for the tenant 200
 333         #  - host hs-3 is directly connected to the router rt-1;
 334         #  - host hs-4 is directly connected to the router rt-2.
 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
 349 check_rt_connectivity()
 350 {
 351         local rtsrc=$1
 352         local rtdst=$2
 353
 354         ip netns exec rt-${rtsrc} ping -c 1 -W 1 ${IPv6_RT_NETWORK}::${rtdst} \
 355                 >/dev/null 2>&1
 356 }
 357
 358 check_and_log_rt_connectivity()
 359 {
 360         local rtsrc=$1
 361         local rtdst=$2
 362
 363         check_rt_connectivity ${rtsrc} ${rtdst}
 364         log_test $? 0 "Routers connectivity: rt-${rtsrc} -> rt-${rtdst}"
 365 }
 366
 367 check_hs_connectivity()
 368 {
 369         local hssrc=$1
 370         local hsdst=$2
 371         local tid=$3
 372
 373         ip netns exec hs-t${tid}-${hssrc} ping -c 1 -W ${PING_TIMEOUT_SEC} \
 374                 ${IPv4_HS_NETWORK}.${hsdst} >/dev/null 2>&1
 375 }
 376
 377 check_and_log_hs_connectivity()
 378 {
 379         local hssrc=$1
 380         local hsdst=$2
 381         local tid=$3
 382
 383         check_hs_connectivity ${hssrc} ${hsdst} ${tid}
 384         log_test $? 0 "Hosts connectivity: hs-t${tid}-${hssrc} -> hs-t${tid}-${hsdst} (tenant ${tid})"
 385 }
 386
 387 check_and_log_hs_isolation()
 388 {
 389         local hssrc=$1
 390         local tidsrc=$2
 391         local hsdst=$3
 392         local tiddst=$4
 393
 394         check_hs_connectivity ${hssrc} ${hsdst} ${tidsrc}
 395         # NOTE: ping should fail
 396         log_test $? 1 "Hosts isolation: hs-t${tidsrc}-${hssrc} -X-> hs-t${tiddst}-${hsdst}"
 397 }
 398
 399
 400 check_and_log_hs2gw_connectivity()
 401 {
 402         local hssrc=$1
 403         local tid=$2
 404
 405         check_hs_connectivity ${hssrc} 254 ${tid}
 406         log_test $? 0 "Hosts connectivity: hs-t${tid}-${hssrc} -> gw (tenant ${tid})"
 407 }
 408
 409 router_tests()
 410 {
 411         log_section "IPv6 routers connectivity test"
 412
 413         check_and_log_rt_connectivity 1 2
 414         check_and_log_rt_connectivity 2 1
 415 }
 416
 417 host2gateway_tests()
 418 {
 419         log_section "IPv4 connectivity test among hosts and gateway"
 420
 421         check_and_log_hs2gw_connectivity 1 100
 422         check_and_log_hs2gw_connectivity 2 100
 423
 424         check_and_log_hs2gw_connectivity 3 200
 425         check_and_log_hs2gw_connectivity 4 200
 426 }
 427
 428 host_vpn_tests()
 429 {
 430         log_section "SRv6 VPN connectivity test among hosts in the same tenant"
 431
 432         check_and_log_hs_connectivity 1 2 100
 433         check_and_log_hs_connectivity 2 1 100
 434
 435         check_and_log_hs_connectivity 3 4 200
 436         check_and_log_hs_connectivity 4 3 200
 437 }
 438
 439 host_vpn_isolation_tests()
 440 {
 441         local i
 442         local j
 443         local k
 444         local tmp
 445         local l1="1 2"
 446         local l2="3 4"
 447         local t1=100
 448         local t2=200
 449
 450         log_section "SRv6 VPN isolation test among hosts in different tentants"
 451
 452         for k in 0 1; do
 453                 for i in ${l1}; do
 454                         for j in ${l2}; do
 455                                 check_and_log_hs_isolation ${i} ${t1} ${j} ${t2}
 456                         done
 457                 done
 458
 459                 # let us test the reverse path
 460                 tmp="${l1}"; l1="${l2}"; l2="${tmp}"
 461                 tmp=${t1}; t1=${t2}; t2=${tmp}
 462         done
 463 }
 464
 465 if [ "$(id -u)" -ne 0 ];then
 466         echo "SKIP: Need root privileges"
 467         exit 0
 468 fi
 469
 470 if [ ! -x "$(command -v ip)" ]; then
 471         echo "SKIP: Could not run test without ip tool"
 472         exit 0
 473 fi
 474
 475 modprobe vrf &>/dev/null
 476 if [ ! -e /proc/sys/net/vrf/strict_mode ]; then
 477         echo "SKIP: vrf sysctl does not exist"
 478         exit 0
 479 fi
 480
 481 cleanup &>/dev/null
 482
 483 setup
 484
 485 router_tests
 486 host2gateway_tests
 487 host_vpn_tests
 488 host_vpn_isolation_tests
 489
 490 print_log_test_results
 491
 492 cleanup &>/dev/null
 493
 494 exit ${ret}