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@uniroma2.it>
6
7 # This test is designed for evaluating the new SRv6 End.DT46 Behavior used for
8 # implementing IPv4/IPv6 L3 VPN use cases.
9 #
10 # The current SRv6 code in the Linux kernel only implements SRv6 End.DT4 and
11 # End.DT6 Behaviors which can be used respectively to support IPv4-in-IPv6 and
12 # IPv6-in-IPv6 VPNs. With End.DT4 and End.DT6 it is not possible to create a
13 # single SRv6 VPN tunnel to carry both IPv4 and IPv6 traffic.
14 # The SRv6 End.DT46 Behavior implementation is meant to support the
15 # decapsulation of IPv4 and IPv6 traffic coming from a single SRv6 tunnel.
16 # Therefore, the SRv6 End.DT46 Behavior in the Linux kernel greatly simplifies
17 # the setup and operations of SRv6 VPNs.
18 #
19 # Hereafter a network diagram is shown, where two different tenants (named 100
20 # and 200) offer IPv4/IPv6 L3 VPN services allowing hosts to communicate with
21 # each other across an IPv6 network.
22 #
23 # Only hosts belonging to the same tenant (and to the same VPN) can communicate
24 # with each other. Instead, the communication among hosts of different tenants
25 # is forbidden.
26 # In other words, hosts hs-t100-1 and hs-t100-2 are connected through the
27 # IPv4/IPv6 L3 VPN of tenant 100 while hs-t200-3 and hs-t200-4 are connected
28 # using the IPv4/IPv6 L3 VPN of tenant 200. Cross connection between tenant 100
29 # and tenant 200 is forbidden and thus, for example, hs-t100-1 cannot reach
30 # hs-t200-3 and vice versa.
31 #
32 # Routers rt-1 and rt-2 implement IPv4/IPv6 L3 VPN services leveraging the SRv6
33 # architecture. The key components for such VPNs are: a) SRv6 Encap behavior,
34 # b) SRv6 End.DT46 Behavior and c) VRF.
35 #
36 # To explain how an IPv4/IPv6 L3 VPN based on SRv6 works, let us briefly
37 # consider an example where, within the same domain of tenant 100, the host
38 # hs-t100-1 pings the host hs-t100-2.
39 #
40 # First of all, L2 reachability of the host hs-t100-2 is taken into account by
41 # the router rt-1 which acts as a arp/ndp proxy.
42 #
43 # When the host hs-t100-1 sends an IPv6 or IPv4 packet destined to hs-t100-2,
44 # the router rt-1 receives the packet on the internal veth-t100 interface. Such
45 # interface is enslaved to the VRF vrf-100 whose associated table contains the
46 # SRv6 Encap route for encapsulating any IPv6 or IPv4 packet in a IPv6 plus the
47 # Segment Routing Header (SRH) packet. This packet is sent through the (IPv6)
48 # core network up to the router rt-2 that receives it on veth0 interface.
49 #
50 # The rt-2 router uses the 'localsid' routing table to process incoming
51 # IPv6+SRH packets which belong to the VPN of the tenant 100. For each of these
52 # packets, the SRv6 End.DT46 Behavior removes the outer IPv6+SRH headers and
53 # performs the lookup on the vrf-100 table using the destination address of
54 # the decapsulated IPv6 or IPv4 packet. Afterwards, the packet is sent to the
55 # host hs-t100-2 through the veth-t100 interface.
56 #
57 # The ping response follows the same processing but this time the roles of rt-1
58 # and rt-2 are swapped.
59 #
60 # Of course, the IPv4/IPv6 L3 VPN for tenant 200 works exactly as the IPv4/IPv6
61 # L3 VPN for tenant 100. In this case, only hosts hs-t200-3 and hs-t200-4 are
62 # able to connect with each other.
63 #
64 #
65 # +-------------------+ +-------------------+
66 # | | | |
67 # | hs-t100-1 netns | | hs-t100-2 netns |
68 # | | | |
69 # | +-------------+ | | +-------------+ |
70 # | | veth0 | | | | veth0 | |
71 # | | cafe::1/64 | | | | cafe::2/64 | |
72 # | | 10.0.0.1/24 | | | | 10.0.0.2/24 | |
73 # | +-------------+ | | +-------------+ |
74 # | . | | . |
75 # +-------------------+ +-------------------+
76 # . .
77 # . .
78 # . .
79 # +-----------------------------------+ +-----------------------------------+
80 # | . | | . |
81 # | +---------------+ | | +---------------- |
82 # | | veth-t100 | | | | veth-t100 | |
83 # | | cafe::254/64 | | | | cafe::254/64 | |
84 # | | 10.0.0.254/24 | +----------+ | | +----------+ | 10.0.0.254/24 | |
85 # | +-------+-------+ | localsid | | | | localsid | +-------+-------- |
86 # | | | table | | | | table | | |
87 # | +----+----+ +----------+ | | +----------+ +----+----+ |
88 # | | vrf-100 | | | | vrf-100 | |
89 # | +---------+ +------------+ | | +------------+ +---------+ |
90 # | | veth0 | | | | veth0 | |
91 # | | fd00::1/64 |.|...|.| fd00::2/64 | |
92 # | +---------+ +------------+ | | +------------+ +---------+ |
93 # | | vrf-200 | | | | vrf-200 | |
94 # | +----+----+ | | +----+----+ |
95 # | | | | | |
96 # | +-------+-------+ | | +-------+-------- |
97 # | | veth-t200 | | | | veth-t200 | |
98 # | | cafe::254/64 | | | | cafe::254/64 | |
99 # | | 10.0.0.254/24 | | | | 10.0.0.254/24 | |
100 # | +---------------+ rt-1 netns | | rt-2 netns +---------------- |
101 # | . | | . |
102 # +-----------------------------------+ +-----------------------------------+
103 # . .
104 # . .
105 # . .
106 # . .
107 # +-------------------+ +-------------------+
108 # | . | | . |
109 # | +-------------+ | | +-------------+ |
110 # | | veth0 | | | | veth0 | |
111 # | | cafe::3/64 | | | | cafe::4/64 | |
112 # | | 10.0.0.3/24 | | | | 10.0.0.4/24 | |
113 # | +-------------+ | | +-------------+ |
114 # | | | |
115 # | hs-t200-3 netns | | hs-t200-4 netns |
116 # | | | |
117 # +-------------------+ +-------------------+
118 #
119 #
120 # ~~~~~~~~~~~~~~~~~~~~~~~~~
121 # | Network configuration |
122 # ~~~~~~~~~~~~~~~~~~~~~~~~~
123 #
124 # rt-1: localsid table (table 90)
125 # +--------------------------------------------------+
126 # |SID |Action |
127 # +--------------------------------------------------+
128 # |fc00:21:100::6046|apply SRv6 End.DT46 vrftable 100|
129 # +--------------------------------------------------+
130 # |fc00:21:200::6046|apply SRv6 End.DT46 vrftable 200|
131 # +--------------------------------------------------+
132 #
133 # rt-1: VRF tenant 100 (table 100)
134 # +---------------------------------------------------+
135 # |host |Action |
136 # +---------------------------------------------------+
137 # |cafe::2 |apply seg6 encap segs fc00:12:100::6046|
138 # +---------------------------------------------------+
139 # |cafe::/64 |forward to dev veth-t100 |
140 # +---------------------------------------------------+
141 # |10.0.0.2 |apply seg6 encap segs fc00:12:100::6046|
142 # +---------------------------------------------------+
143 # |10.0.0.0/24|forward to dev veth-t100 |
144 # +---------------------------------------------------+
145 #
146 # rt-1: VRF tenant 200 (table 200)
147 # +---------------------------------------------------+
148 # |host |Action |
149 # +---------------------------------------------------+
150 # |cafe::4 |apply seg6 encap segs fc00:12:200::6046|
151 # +---------------------------------------------------+
152 # |cafe::/64 |forward to dev veth-t200 |
153 # +---------------------------------------------------+
154 # |10.0.0.4 |apply seg6 encap segs fc00:12:200::6046|
155 # +---------------------------------------------------+
156 # |10.0.0.0/24|forward to dev veth-t200 |
157 # +---------------------------------------------------+
158 #
159 #
160 # rt-2: localsid table (table 90)
161 # +--------------------------------------------------+
162 # |SID |Action |
163 # +--------------------------------------------------+
164 # |fc00:12:100::6046|apply SRv6 End.DT46 vrftable 100|
165 # +--------------------------------------------------+
166 # |fc00:12:200::6046|apply SRv6 End.DT46 vrftable 200|
167 # +--------------------------------------------------+
168 #
169 # rt-2: VRF tenant 100 (table 100)
170 # +---------------------------------------------------+
171 # |host |Action |
172 # +---------------------------------------------------+
173 # |cafe::1 |apply seg6 encap segs fc00:21:100::6046|
174 # +---------------------------------------------------+
175 # |cafe::/64 |forward to dev veth-t100 |
176 # +---------------------------------------------------+
177 # |10.0.0.1 |apply seg6 encap segs fc00:21:100::6046|
178 # +---------------------------------------------------+
179 # |10.0.0.0/24|forward to dev veth-t100 |
180 # +---------------------------------------------------+
181 #
182 # rt-2: VRF tenant 200 (table 200)
183 # +---------------------------------------------------+
184 # |host |Action |
185 # +---------------------------------------------------+
186 # |cafe::3 |apply seg6 encap segs fc00:21:200::6046|
187 # +---------------------------------------------------+
188 # |cafe::/64 |forward to dev veth-t200 |
189 # +---------------------------------------------------+
190 # |10.0.0.3 |apply seg6 encap segs fc00:21:200::6046|
191 # +---------------------------------------------------+
192 # |10.0.0.0/24|forward to dev veth-t200 |
193 # +---------------------------------------------------+
194 #
195
196 source lib.sh
197
198 readonly LOCALSID_TABLE_ID=90
199 readonly IPv6_RT_NETWORK=fd00
200 readonly IPv6_HS_NETWORK=cafe
201 readonly IPv4_HS_NETWORK=10.0.0
202 readonly VPN_LOCATOR_SERVICE=fc00
203 PING_TIMEOUT_SEC=4
204
205 ret=0
206
207 PAUSE_ON_FAIL=${PAUSE_ON_FAIL:=no}
208
209 log_test()
210 {
211 local rc=$1
212 local expected=$2
213 local msg="$3"
214
215 if [ ${rc} -eq ${expected} ]; then
216 nsuccess=$((nsuccess+1))
217 printf "\n TEST: %-60s [ OK ]\n" "${msg}"
218 else
219 ret=1
220 nfail=$((nfail+1))
221 printf "\n TEST: %-60s [FAIL]\n" "${msg}"
222 if [ "${PAUSE_ON_FAIL}" = "yes" ]; then
223 echo
224 echo "hit enter to continue, 'q' to quit"
225 read a
226 [ "$a" = "q" ] && exit 1
227 fi
228 fi
229 }
230
231 print_log_test_results()
232 {
233 if [ "$TESTS" != "none" ]; then
234 printf "\nTests passed: %3d\n" ${nsuccess}
235 printf "Tests failed: %3d\n" ${nfail}
236 fi
237 }
238
239 log_section()
240 {
241 echo
242 echo "################################################################################"
243 echo "TEST SECTION: $*"
244 echo "################################################################################"
245 }
246
247 cleanup()
248 {
249 ip link del veth-rt-1 2>/dev/null || true
250 ip link del veth-rt-2 2>/dev/null || true
251
252 cleanup_all_ns
253 }
254
255 # Setup the basic networking for the routers
256 setup_rt_networking()
257 {
258 local id=$1
259 eval local nsname=\${rt_${id}}
260
261 ip link set veth-rt-${id} netns ${nsname}
262 ip -netns ${nsname} link set veth-rt-${id} name veth0
263
264 ip netns exec ${nsname} sysctl -wq net.ipv6.conf.all.accept_dad=0
265 ip netns exec ${nsname} sysctl -wq net.ipv6.conf.default.accept_dad=0
266
267 ip -netns ${nsname} addr add ${IPv6_RT_NETWORK}::${id}/64 dev veth0 nodad
268 ip -netns ${nsname} link set veth0 up
269 ip -netns ${nsname} link set lo up
270
271 ip netns exec ${nsname} sysctl -wq net.ipv4.ip_forward=1
272 ip netns exec ${nsname} sysctl -wq net.ipv6.conf.all.forwarding=1
273 }
274
275 setup_hs()
276 {
277 local hid=$1
278 local rid=$2
279 local tid=$3
280 eval local hsname=\${hs_t${tid}_${hid}}
281 eval local rtname=\${rt_${rid}}
282 local rtveth=veth-t${tid}
283
284 # set the networking for the host
285 ip netns exec ${hsname} sysctl -wq net.ipv6.conf.all.accept_dad=0
286 ip netns exec ${hsname} sysctl -wq net.ipv6.conf.default.accept_dad=0
287
288 # disable the rp_filter otherwise the kernel gets confused about how
289 # to route decap ipv4 packets.
290 ip netns exec ${rtname} sysctl -wq net.ipv4.conf.all.rp_filter=0
291 ip netns exec ${rtname} sysctl -wq net.ipv4.conf.default.rp_filter=0
292
293 ip -netns ${hsname} link add veth0 type veth peer name ${rtveth}
294 ip -netns ${hsname} link set ${rtveth} netns ${rtname}
295 ip -netns ${hsname} addr add ${IPv6_HS_NETWORK}::${hid}/64 dev veth0 nodad
296 ip -netns ${hsname} addr add ${IPv4_HS_NETWORK}.${hid}/24 dev veth0
297 ip -netns ${hsname} link set veth0 up
298 ip -netns ${hsname} link set lo up
299
300 # configure the VRF for the tenant X on the router which is directly
301 # connected to the source host.
302 ip -netns ${rtname} link add vrf-${tid} type vrf table ${tid}
303 ip -netns ${rtname} link set vrf-${tid} up
304
305 ip netns exec ${rtname} sysctl -wq net.ipv6.conf.all.accept_dad=0
306 ip netns exec ${rtname} sysctl -wq net.ipv6.conf.default.accept_dad=0
307
308 # enslave the veth-tX interface to the vrf-X in the access router
309 ip -netns ${rtname} link set ${rtveth} master vrf-${tid}
310 ip -netns ${rtname} addr add ${IPv6_HS_NETWORK}::254/64 dev ${rtveth} nodad
311 ip -netns ${rtname} addr add ${IPv4_HS_NETWORK}.254/24 dev ${rtveth}
312 ip -netns ${rtname} link set ${rtveth} up
313
314 ip netns exec ${rtname} sysctl -wq net.ipv6.conf.${rtveth}.proxy_ndp=1
315 ip netns exec ${rtname} sysctl -wq net.ipv4.conf.${rtveth}.proxy_arp=1
316
317 ip netns exec ${rtname} sh -c "echo 1 > /proc/sys/net/vrf/strict_mode"
318 }
319
320 setup_vpn_config()
321 {
322 local hssrc=$1
323 local rtsrc=$2
324 local hsdst=$3
325 local rtdst=$4
326 local tid=$5
327
328 eval local rtsrc_name=\${rt_${rtsrc}}
329 eval local rtdst_name=\${rt_${rtdst}}
330 local rtveth=veth-t${tid}
331 local vpn_sid=${VPN_LOCATOR_SERVICE}:${hssrc}${hsdst}:${tid}::6046
332
333 ip -netns ${rtsrc_name} -6 neigh add proxy ${IPv6_HS_NETWORK}::${hsdst} dev ${rtveth}
334
335 # set the encap route for encapsulating packets which arrive from the
336 # host hssrc and destined to the access router rtsrc.
337 ip -netns ${rtsrc_name} -6 route add ${IPv6_HS_NETWORK}::${hsdst}/128 vrf vrf-${tid} \
338 encap seg6 mode encap segs ${vpn_sid} dev veth0
339 ip -netns ${rtsrc_name} -4 route add ${IPv4_HS_NETWORK}.${hsdst}/32 vrf vrf-${tid} \
340 encap seg6 mode encap segs ${vpn_sid} dev veth0
341 ip -netns ${rtsrc_name} -6 route add ${vpn_sid}/128 vrf vrf-${tid} \
342 via fd00::${rtdst} dev veth0
343
344 # set the decap route for decapsulating packets which arrive from
345 # the rtdst router and destined to the hsdst host.
346 ip -netns ${rtdst_name} -6 route add ${vpn_sid}/128 table ${LOCALSID_TABLE_ID} \
347 encap seg6local action End.DT46 vrftable ${tid} dev vrf-${tid}
348
349 # all sids for VPNs start with a common locator which is fc00::/16.
350 # Routes for handling the SRv6 End.DT46 behavior instances are grouped
351 # together in the 'localsid' table.
352 #
353 # NOTE: added only once
354 if [ -z "$(ip -netns ${rtdst_name} -6 rule show | \
355 grep "to ${VPN_LOCATOR_SERVICE}::/16 lookup ${LOCALSID_TABLE_ID}")" ]; then
356 ip -netns ${rtdst_name} -6 rule add \
357 to ${VPN_LOCATOR_SERVICE}::/16 \
358 lookup ${LOCALSID_TABLE_ID} prio 999
359 fi
360
361 # set default routes to unreachable for both ipv4 and ipv6
362 ip -netns ${rtsrc_name} -6 route add unreachable default metric 4278198272 \
363 vrf vrf-${tid}
364
365 ip -netns ${rtsrc_name} -4 route add unreachable default metric 4278198272 \
366 vrf vrf-${tid}
367 }
368
369 setup()
370 {
371 ip link add veth-rt-1 type veth peer name veth-rt-2
372 # setup the networking for router rt-1 and router rt-2
373 setup_ns rt_1 rt_2
374 setup_rt_networking 1
375 setup_rt_networking 2
376
377 # setup two hosts for the tenant 100.
378 # - host hs-1 is directly connected to the router rt-1;
379 # - host hs-2 is directly connected to the router rt-2.
380 setup_ns hs_t100_1 hs_t100_2
381 setup_hs 1 1 100 #args: host router tenant
382 setup_hs 2 2 100
383
384 # setup two hosts for the tenant 200
385 # - host hs-3 is directly connected to the router rt-1;
386 # - host hs-4 is directly connected to the router rt-2.
387 setup_ns hs_t200_3 hs_t200_4
388 setup_hs 3 1 200
389 setup_hs 4 2 200
390
391 # setup the IPv4/IPv6 L3 VPN which connects the host hs-t100-1 and host
392 # hs-t100-2 within the same tenant 100.
393 setup_vpn_config 1 1 2 2 100 #args: src_host src_router dst_host dst_router tenant
394 setup_vpn_config 2 2 1 1 100
395
396 # setup the IPv4/IPv6 L3 VPN which connects the host hs-t200-3 and host
397 # hs-t200-4 within the same tenant 200.
398 setup_vpn_config 3 1 4 2 200
399 setup_vpn_config 4 2 3 1 200
400 }
401
402 check_rt_connectivity()
403 {
404 local rtsrc=$1
405 local rtdst=$2
406 eval local nsname=\${rt_${rtsrc}}
407
408 ip netns exec ${nsname} ping -c 1 -W 1 ${IPv6_RT_NETWORK}::${rtdst} \
409 >/dev/null 2>&1
410 }
411
412 check_and_log_rt_connectivity()
413 {
414 local rtsrc=$1
415 local rtdst=$2
416
417 check_rt_connectivity ${rtsrc} ${rtdst}
418 log_test $? 0 "Routers connectivity: rt-${rtsrc} -> rt-${rtdst}"
419 }
420
421 check_hs_ipv6_connectivity()
422 {
423 local hssrc=$1
424 local hsdst=$2
425 local tid=$3
426 eval local nsname=\${hs_t${tid}_${hssrc}}
427
428 ip netns exec ${nsname} ping -c 1 -W ${PING_TIMEOUT_SEC} \
429 ${IPv6_HS_NETWORK}::${hsdst} >/dev/null 2>&1
430 }
431
432 check_hs_ipv4_connectivity()
433 {
434 local hssrc=$1
435 local hsdst=$2
436 local tid=$3
437 eval local nsname=\${hs_t${tid}_${hssrc}}
438
439 ip netns exec ${nsname} ping -c 1 -W ${PING_TIMEOUT_SEC} \
440 ${IPv4_HS_NETWORK}.${hsdst} >/dev/null 2>&1
441 }
442
443 check_and_log_hs_connectivity()
444 {
445 local hssrc=$1
446 local hsdst=$2
447 local tid=$3
448
449 check_hs_ipv6_connectivity ${hssrc} ${hsdst} ${tid}
450 log_test $? 0 "IPv6 Hosts connectivity: hs-t${tid}-${hssrc} -> hs-t${tid}-${hsdst} (tenant ${tid})"
451
452 check_hs_ipv4_connectivity ${hssrc} ${hsdst} ${tid}
453 log_test $? 0 "IPv4 Hosts connectivity: hs-t${tid}-${hssrc} -> hs-t${tid}-${hsdst} (tenant ${tid})"
454
455 }
456
457 check_and_log_hs_isolation()
458 {
459 local hssrc=$1
460 local tidsrc=$2
461 local hsdst=$3
462 local tiddst=$4
463
464 check_hs_ipv6_connectivity ${hssrc} ${hsdst} ${tidsrc}
465 # NOTE: ping should fail
466 log_test $? 1 "IPv6 Hosts isolation: hs-t${tidsrc}-${hssrc} -X-> hs-t${tiddst}-${hsdst}"
467
468 check_hs_ipv4_connectivity ${hssrc} ${hsdst} ${tidsrc}
469 # NOTE: ping should fail
470 log_test $? 1 "IPv4 Hosts isolation: hs-t${tidsrc}-${hssrc} -X-> hs-t${tiddst}-${hsdst}"
471
472 }
473
474
475 check_and_log_hs2gw_connectivity()
476 {
477 local hssrc=$1
478 local tid=$2
479
480 check_hs_ipv6_connectivity ${hssrc} 254 ${tid}
481 log_test $? 0 "IPv6 Hosts connectivity: hs-t${tid}-${hssrc} -> gw (tenant ${tid})"
482
483 check_hs_ipv4_connectivity ${hssrc} 254 ${tid}
484 log_test $? 0 "IPv4 Hosts connectivity: hs-t${tid}-${hssrc} -> gw (tenant ${tid})"
485
486 }
487
488 router_tests()
489 {
490 log_section "IPv6 routers connectivity test"
491
492 check_and_log_rt_connectivity 1 2
493 check_and_log_rt_connectivity 2 1
494 }
495
496 host2gateway_tests()
497 {
498 log_section "IPv4/IPv6 connectivity test among hosts and gateway"
499
500 check_and_log_hs2gw_connectivity 1 100
501 check_and_log_hs2gw_connectivity 2 100
502
503 check_and_log_hs2gw_connectivity 3 200
504 check_and_log_hs2gw_connectivity 4 200
505 }
506
507 host_vpn_tests()
508 {
509 log_section "SRv6 VPN connectivity test among hosts in the same tenant"
510
511 check_and_log_hs_connectivity 1 2 100
512 check_and_log_hs_connectivity 2 1 100
513
514 check_and_log_hs_connectivity 3 4 200
515 check_and_log_hs_connectivity 4 3 200
516 }
517
518 host_vpn_isolation_tests()
519 {
520 local i
521 local j
522 local k
523 local tmp
524 local l1="1 2"
525 local l2="3 4"
526 local t1=100
527 local t2=200
528
529 log_section "SRv6 VPN isolation test among hosts in different tentants"
530
531 for k in 0 1; do
532 for i in ${l1}; do
533 for j in ${l2}; do
534 check_and_log_hs_isolation ${i} ${t1} ${j} ${t2}
535 done
536 done
537
538 # let us test the reverse path
539 tmp="${l1}"; l1="${l2}"; l2="${tmp}"
540 tmp=${t1}; t1=${t2}; t2=${tmp}
541 done
542 }
543
544 if [ "$(id -u)" -ne 0 ];then
545 echo "SKIP: Need root privileges"
546 exit $ksft_skip
547 fi
548
549 if [ ! -x "$(command -v ip)" ]; then
550 echo "SKIP: Could not run test without ip tool"
551 exit $ksft_skip
552 fi
553
554 modprobe vrf &>/dev/null
555 if [ ! -e /proc/sys/net/vrf/strict_mode ]; then
556 echo "SKIP: vrf sysctl does not exist"
557 exit $ksft_skip
558 fi
559
560 cleanup &>/dev/null
561
562 setup
563
564 router_tests
565 host2gateway_tests
566 host_vpn_tests
567 host_vpn_isolation_tests
568
569 print_log_test_results
570
571 cleanup &>/dev/null
572
573 exit ${ret}
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