tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
196source lib.sh
197
198readonly LOCALSID_TABLE_ID=90
199readonly IPv6_RT_NETWORK=fd00
200readonly IPv6_HS_NETWORK=cafe
201readonly IPv4_HS_NETWORK=10.0.0
202readonly VPN_LOCATOR_SERVICE=fc00
203PING_TIMEOUT_SEC=4
204
205ret=0
206
207PAUSE_ON_FAIL=${PAUSE_ON_FAIL:=no}
208
209log_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 [ "$a" = "q" ] && exit 1
227 fi
228 fi
229}
230
231print_log_test_results()
232{
233 if [ "$TESTS" != "none" ]; then
234 printf "\nTests passed: %3d\n" ${nsuccess}
235 printf "Tests failed: %3d\n" ${nfail}
236 fi
237}
238
239log_section()
240{
241 echo
242 echo "################################################################################"
243 echo "TEST SECTION: $*"
244 echo "################################################################################"
245}
246
247cleanup()
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
256setup_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
275setup_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
320setup_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
369setup()
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
402check_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
412check_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
421check_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
432check_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
443check_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
457check_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
475check_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
488router_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
496host2gateway_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
507host_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
518host_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=${tmp}
541 done
542}
543
544if [ "$(id -u)" -ne 0 ];then
545 echo "SKIP: Need root privileges"
546 exit $ksft_skip
547fi
548
549if [ ! -x "$(command -v ip)" ]; then
550 echo "SKIP: Could not run test without ip tool"
551 exit $ksft_skip
552fi
553
554modprobe vrf &>/dev/null
555if [ ! -e /proc/sys/net/vrf/strict_mode ]; then
556 echo "SKIP: vrf sysctl does not exist"
557 exit $ksft_skip
558fi
559
560cleanup &>/dev/null
561
562setup
563
564router_tests
565host2gateway_tests
566host_vpn_tests
567host_vpn_isolation_tests
568
569print_log_test_results
570
571cleanup &>/dev/null
572
573exit ${ret}