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
196# Kselftest framework requirement - SKIP code is 4.
197ksft_skip=4
198
199readonly LOCALSID_TABLE_ID=90
200readonly IPv6_RT_NETWORK=fd00
201readonly IPv6_HS_NETWORK=cafe
202readonly IPv4_HS_NETWORK=10.0.0
203readonly VPN_LOCATOR_SERVICE=fc00
204PING_TIMEOUT_SEC=4
205
206ret=0
207
208PAUSE_ON_FAIL=${PAUSE_ON_FAIL:=no}
209
210log_test()
211{
212 local rc=$1
213 local expected=$2
214 local msg="$3"
215
216 if [ ${rc} -eq ${expected} ]; then
217 nsuccess=$((nsuccess+1))
218 printf "\n TEST: %-60s [ OK ]\n" "${msg}"
219 else
220 ret=1
221 nfail=$((nfail+1))
222 printf "\n TEST: %-60s [FAIL]\n" "${msg}"
223 if [ "${PAUSE_ON_FAIL}" = "yes" ]; then
224 echo
225 echo "hit enter to continue, 'q' to quit"
226 read a
227 [ "$a" = "q" ] && exit 1
228 fi
229 fi
230}
231
232print_log_test_results()
233{
234 if [ "$TESTS" != "none" ]; then
235 printf "\nTests passed: %3d\n" ${nsuccess}
236 printf "Tests failed: %3d\n" ${nfail}
237 fi
238}
239
240log_section()
241{
242 echo
243 echo "################################################################################"
244 echo "TEST SECTION: $*"
245 echo "################################################################################"
246}
247
248cleanup()
249{
250 ip link del veth-rt-1 2>/dev/null || true
251 ip link del veth-rt-2 2>/dev/null || true
252
253 # destroy routers rt-* and hosts hs-*
254 for ns in $(ip netns show | grep -E 'rt-*|hs-*'); do
255 ip netns del ${ns} || true
256 done
257}
258
259# Setup the basic networking for the routers
260setup_rt_networking()
261{
262 local rt=$1
263 local nsname=rt-${rt}
264
265 ip netns add ${nsname}
266 ip link set veth-rt-${rt} netns ${nsname}
267 ip -netns ${nsname} link set veth-rt-${rt} name veth0
268
269 ip netns exec ${nsname} sysctl -wq net.ipv6.conf.all.accept_dad=0
270 ip netns exec ${nsname} sysctl -wq net.ipv6.conf.default.accept_dad=0
271
272 ip -netns ${nsname} addr add ${IPv6_RT_NETWORK}::${rt}/64 dev veth0 nodad
273 ip -netns ${nsname} link set veth0 up
274 ip -netns ${nsname} link set lo up
275
276 ip netns exec ${nsname} sysctl -wq net.ipv4.ip_forward=1
277 ip netns exec ${nsname} sysctl -wq net.ipv6.conf.all.forwarding=1
278}
279
280setup_hs()
281{
282 local hs=$1
283 local rt=$2
284 local tid=$3
285 local hsname=hs-t${tid}-${hs}
286 local rtname=rt-${rt}
287 local rtveth=veth-t${tid}
288
289 # set the networking for the host
290 ip netns add ${hsname}
291
292 ip netns exec ${hsname} sysctl -wq net.ipv6.conf.all.accept_dad=0
293 ip netns exec ${hsname} sysctl -wq net.ipv6.conf.default.accept_dad=0
294
295 ip -netns ${hsname} link add veth0 type veth peer name ${rtveth}
296 ip -netns ${hsname} link set ${rtveth} netns ${rtname}
297 ip -netns ${hsname} addr add ${IPv6_HS_NETWORK}::${hs}/64 dev veth0 nodad
298 ip -netns ${hsname} addr add ${IPv4_HS_NETWORK}.${hs}/24 dev veth0
299 ip -netns ${hsname} link set veth0 up
300 ip -netns ${hsname} link set lo up
301
302 # configure the VRF for the tenant X on the router which is directly
303 # connected to the source host.
304 ip -netns ${rtname} link add vrf-${tid} type vrf table ${tid}
305 ip -netns ${rtname} link set vrf-${tid} up
306
307 ip netns exec ${rtname} sysctl -wq net.ipv6.conf.all.accept_dad=0
308 ip netns exec ${rtname} sysctl -wq net.ipv6.conf.default.accept_dad=0
309
310 # enslave the veth-tX interface to the vrf-X in the access router
311 ip -netns ${rtname} link set ${rtveth} master vrf-${tid}
312 ip -netns ${rtname} addr add ${IPv6_HS_NETWORK}::254/64 dev ${rtveth} nodad
313 ip -netns ${rtname} addr add ${IPv4_HS_NETWORK}.254/24 dev ${rtveth}
314 ip -netns ${rtname} link set ${rtveth} up
315
316 ip netns exec ${rtname} sysctl -wq net.ipv6.conf.${rtveth}.proxy_ndp=1
317 ip netns exec ${rtname} sysctl -wq net.ipv4.conf.${rtveth}.proxy_arp=1
318
319 # disable the rp_filter otherwise the kernel gets confused about how
320 # to route decap ipv4 packets.
321 ip netns exec ${rtname} sysctl -wq net.ipv4.conf.all.rp_filter=0
322 ip netns exec ${rtname} sysctl -wq net.ipv4.conf.${rtveth}.rp_filter=0
323
324 ip netns exec ${rtname} sh -c "echo 1 > /proc/sys/net/vrf/strict_mode"
325}
326
327setup_vpn_config()
328{
329 local hssrc=$1
330 local rtsrc=$2
331 local hsdst=$3
332 local rtdst=$4
333 local tid=$5
334
335 local hssrc_name=hs-t${tid}-${hssrc}
336 local hsdst_name=hs-t${tid}-${hsdst}
337 local rtsrc_name=rt-${rtsrc}
338 local rtdst_name=rt-${rtdst}
339 local rtveth=veth-t${tid}
340 local vpn_sid=${VPN_LOCATOR_SERVICE}:${hssrc}${hsdst}:${tid}::6046
341
342 ip -netns ${rtsrc_name} -6 neigh add proxy ${IPv6_HS_NETWORK}::${hsdst} dev ${rtveth}
343
344 # set the encap route for encapsulating packets which arrive from the
345 # host hssrc and destined to the access router rtsrc.
346 ip -netns ${rtsrc_name} -6 route add ${IPv6_HS_NETWORK}::${hsdst}/128 vrf vrf-${tid} \
347 encap seg6 mode encap segs ${vpn_sid} dev veth0
348 ip -netns ${rtsrc_name} -4 route add ${IPv4_HS_NETWORK}.${hsdst}/32 vrf vrf-${tid} \
349 encap seg6 mode encap segs ${vpn_sid} dev veth0
350 ip -netns ${rtsrc_name} -6 route add ${vpn_sid}/128 vrf vrf-${tid} \
351 via fd00::${rtdst} dev veth0
352
353 # set the decap route for decapsulating packets which arrive from
354 # the rtdst router and destined to the hsdst host.
355 ip -netns ${rtdst_name} -6 route add ${vpn_sid}/128 table ${LOCALSID_TABLE_ID} \
356 encap seg6local action End.DT46 vrftable ${tid} dev vrf-${tid}
357
358 # all sids for VPNs start with a common locator which is fc00::/16.
359 # Routes for handling the SRv6 End.DT46 behavior instances are grouped
360 # together in the 'localsid' table.
361 #
362 # NOTE: added only once
363 if [ -z "$(ip -netns ${rtdst_name} -6 rule show | \
364 grep "to ${VPN_LOCATOR_SERVICE}::/16 lookup ${LOCALSID_TABLE_ID}")" ]; then
365 ip -netns ${rtdst_name} -6 rule add \
366 to ${VPN_LOCATOR_SERVICE}::/16 \
367 lookup ${LOCALSID_TABLE_ID} prio 999
368 fi
369
370 # set default routes to unreachable for both ipv4 and ipv6
371 ip -netns ${rtsrc_name} -6 route add unreachable default metric 4278198272 \
372 vrf vrf-${tid}
373
374 ip -netns ${rtsrc_name} -4 route add unreachable default metric 4278198272 \
375 vrf vrf-${tid}
376}
377
378setup()
379{
380 ip link add veth-rt-1 type veth peer name veth-rt-2
381 # setup the networking for router rt-1 and router rt-2
382 setup_rt_networking 1
383 setup_rt_networking 2
384
385 # setup two hosts for the tenant 100.
386 # - host hs-1 is directly connected to the router rt-1;
387 # - host hs-2 is directly connected to the router rt-2.
388 setup_hs 1 1 100 #args: host router tenant
389 setup_hs 2 2 100
390
391 # setup two hosts for the tenant 200
392 # - host hs-3 is directly connected to the router rt-1;
393 # - host hs-4 is directly connected to the router rt-2.
394 setup_hs 3 1 200
395 setup_hs 4 2 200
396
397 # setup the IPv4/IPv6 L3 VPN which connects the host hs-t100-1 and host
398 # hs-t100-2 within the same tenant 100.
399 setup_vpn_config 1 1 2 2 100 #args: src_host src_router dst_host dst_router tenant
400 setup_vpn_config 2 2 1 1 100
401
402 # setup the IPv4/IPv6 L3 VPN which connects the host hs-t200-3 and host
403 # hs-t200-4 within the same tenant 200.
404 setup_vpn_config 3 1 4 2 200
405 setup_vpn_config 4 2 3 1 200
406}
407
408check_rt_connectivity()
409{
410 local rtsrc=$1
411 local rtdst=$2
412
413 ip netns exec rt-${rtsrc} ping -c 1 -W 1 ${IPv6_RT_NETWORK}::${rtdst} \
414 >/dev/null 2>&1
415}
416
417check_and_log_rt_connectivity()
418{
419 local rtsrc=$1
420 local rtdst=$2
421
422 check_rt_connectivity ${rtsrc} ${rtdst}
423 log_test $? 0 "Routers connectivity: rt-${rtsrc} -> rt-${rtdst}"
424}
425
426check_hs_ipv6_connectivity()
427{
428 local hssrc=$1
429 local hsdst=$2
430 local tid=$3
431
432 ip netns exec hs-t${tid}-${hssrc} ping -c 1 -W ${PING_TIMEOUT_SEC} \
433 ${IPv6_HS_NETWORK}::${hsdst} >/dev/null 2>&1
434}
435
436check_hs_ipv4_connectivity()
437{
438 local hssrc=$1
439 local hsdst=$2
440 local tid=$3
441
442 ip netns exec hs-t${tid}-${hssrc} ping -c 1 -W ${PING_TIMEOUT_SEC} \
443 ${IPv4_HS_NETWORK}.${hsdst} >/dev/null 2>&1
444}
445
446check_and_log_hs_connectivity()
447{
448 local hssrc=$1
449 local hsdst=$2
450 local tid=$3
451
452 check_hs_ipv6_connectivity ${hssrc} ${hsdst} ${tid}
453 log_test $? 0 "IPv6 Hosts connectivity: hs-t${tid}-${hssrc} -> hs-t${tid}-${hsdst} (tenant ${tid})"
454
455 check_hs_ipv4_connectivity ${hssrc} ${hsdst} ${tid}
456 log_test $? 0 "IPv4 Hosts connectivity: hs-t${tid}-${hssrc} -> hs-t${tid}-${hsdst} (tenant ${tid})"
457
458}
459
460check_and_log_hs_isolation()
461{
462 local hssrc=$1
463 local tidsrc=$2
464 local hsdst=$3
465 local tiddst=$4
466
467 check_hs_ipv6_connectivity ${hssrc} ${hsdst} ${tidsrc}
468 # NOTE: ping should fail
469 log_test $? 1 "IPv6 Hosts isolation: hs-t${tidsrc}-${hssrc} -X-> hs-t${tiddst}-${hsdst}"
470
471 check_hs_ipv4_connectivity ${hssrc} ${hsdst} ${tidsrc}
472 # NOTE: ping should fail
473 log_test $? 1 "IPv4 Hosts isolation: hs-t${tidsrc}-${hssrc} -X-> hs-t${tiddst}-${hsdst}"
474
475}
476
477
478check_and_log_hs2gw_connectivity()
479{
480 local hssrc=$1
481 local tid=$2
482
483 check_hs_ipv6_connectivity ${hssrc} 254 ${tid}
484 log_test $? 0 "IPv6 Hosts connectivity: hs-t${tid}-${hssrc} -> gw (tenant ${tid})"
485
486 check_hs_ipv4_connectivity ${hssrc} 254 ${tid}
487 log_test $? 0 "IPv4 Hosts connectivity: hs-t${tid}-${hssrc} -> gw (tenant ${tid})"
488
489}
490
491router_tests()
492{
493 log_section "IPv6 routers connectivity test"
494
495 check_and_log_rt_connectivity 1 2
496 check_and_log_rt_connectivity 2 1
497}
498
499host2gateway_tests()
500{
501 log_section "IPv4/IPv6 connectivity test among hosts and gateway"
502
503 check_and_log_hs2gw_connectivity 1 100
504 check_and_log_hs2gw_connectivity 2 100
505
506 check_and_log_hs2gw_connectivity 3 200
507 check_and_log_hs2gw_connectivity 4 200
508}
509
510host_vpn_tests()
511{
512 log_section "SRv6 VPN connectivity test among hosts in the same tenant"
513
514 check_and_log_hs_connectivity 1 2 100
515 check_and_log_hs_connectivity 2 1 100
516
517 check_and_log_hs_connectivity 3 4 200
518 check_and_log_hs_connectivity 4 3 200
519}
520
521host_vpn_isolation_tests()
522{
523 local i
524 local j
525 local k
526 local tmp
527 local l1="1 2"
528 local l2="3 4"
529 local t1=100
530 local t2=200
531
532 log_section "SRv6 VPN isolation test among hosts in different tentants"
533
534 for k in 0 1; do
535 for i in ${l1}; do
536 for j in ${l2}; do
537 check_and_log_hs_isolation ${i} ${t1} ${j} ${t2}
538 done
539 done
540
541 # let us test the reverse path
542 tmp="${l1}"; l1="${l2}"; l2="${tmp}"
543 tmp=${t1}; t1=${t2}; t2=${tmp}
544 done
545}
546
547if [ "$(id -u)" -ne 0 ];then
548 echo "SKIP: Need root privileges"
549 exit $ksft_skip
550fi
551
552if [ ! -x "$(command -v ip)" ]; then
553 echo "SKIP: Could not run test without ip tool"
554 exit $ksft_skip
555fi
556
557modprobe vrf &>/dev/null
558if [ ! -e /proc/sys/net/vrf/strict_mode ]; then
559 echo "SKIP: vrf sysctl does not exist"
560 exit $ksft_skip
561fi
562
563cleanup &>/dev/null
564
565setup
566
567router_tests
568host2gateway_tests
569host_vpn_tests
570host_vpn_isolation_tests
571
572print_log_test_results
573
574cleanup &>/dev/null
575
576exit ${ret}