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@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
167source lib.sh
168
169readonly LOCALSID_TABLE_ID=90
170readonly IPv6_RT_NETWORK=fd00
171readonly IPv6_HS_NETWORK=cafe
172readonly VPN_LOCATOR_SERVICE=fc00
173PING_TIMEOUT_SEC=4
174
175ret=0
176
177PAUSE_ON_FAIL=${PAUSE_ON_FAIL:=no}
178
179log_test()
180{
181 local rc=$1
182 local expected=$2
183 local msg="$3"
184
185 if [ ${rc} -eq ${expected} ]; then
186 nsuccess=$((nsuccess+1))
187 printf "\n TEST: %-60s [ OK ]\n" "${msg}"
188 else
189 ret=1
190 nfail=$((nfail+1))
191 printf "\n TEST: %-60s [FAIL]\n" "${msg}"
192 if [ "${PAUSE_ON_FAIL}" = "yes" ]; then
193 echo
194 echo "hit enter to continue, 'q' to quit"
195 read a
196 [ "$a" = "q" ] && exit 1
197 fi
198 fi
199}
200
201print_log_test_results()
202{
203 if [ "$TESTS" != "none" ]; then
204 printf "\nTests passed: %3d\n" ${nsuccess}
205 printf "Tests failed: %3d\n" ${nfail}
206 fi
207}
208
209log_section()
210{
211 echo
212 echo "################################################################################"
213 echo "TEST SECTION: $*"
214 echo "################################################################################"
215}
216
217cleanup()
218{
219 ip link del veth-rt-1 2>/dev/null || true
220 ip link del veth-rt-2 2>/dev/null || true
221
222 cleanup_all_ns
223}
224
225# Setup the basic networking for the routers
226setup_rt_networking()
227{
228 local id=$1
229 eval local nsname=\${rt_${id}}
230
231 ip link set veth-rt-${id} netns ${nsname}
232 ip -netns ${nsname} link set veth-rt-${id} name veth0
233
234 ip netns exec ${nsname} sysctl -wq net.ipv6.conf.all.accept_dad=0
235 ip netns exec ${nsname} sysctl -wq net.ipv6.conf.default.accept_dad=0
236
237 ip -netns ${nsname} addr add ${IPv6_RT_NETWORK}::${id}/64 dev veth0 nodad
238 ip -netns ${nsname} link set veth0 up
239 ip -netns ${nsname} link set lo up
240
241 ip netns exec ${nsname} sysctl -wq net.ipv6.conf.all.forwarding=1
242}
243
244setup_hs()
245{
246 local hid=$1
247 local rid=$2
248 local tid=$3
249 eval local hsname=\${hs_t${tid}_${hid}}
250 eval local rtname=\${rt_${rid}}
251 local rtveth=veth-t${tid}
252
253 # set the networking for the host
254 ip netns exec ${hsname} sysctl -wq net.ipv6.conf.all.accept_dad=0
255 ip netns exec ${hsname} sysctl -wq net.ipv6.conf.default.accept_dad=0
256
257 ip -netns ${hsname} link add veth0 type veth peer name ${rtveth}
258 ip -netns ${hsname} link set ${rtveth} netns ${rtname}
259 ip -netns ${hsname} addr add ${IPv6_HS_NETWORK}::${hid}/64 dev veth0 nodad
260 ip -netns ${hsname} link set veth0 up
261 ip -netns ${hsname} link set lo up
262
263 # configure the VRF for the tenant X on the router which is directly
264 # connected to the source host.
265 ip -netns ${rtname} link add vrf-${tid} type vrf table ${tid}
266 ip -netns ${rtname} link set vrf-${tid} up
267
268 ip netns exec ${rtname} sysctl -wq net.ipv6.conf.all.accept_dad=0
269 ip netns exec ${rtname} sysctl -wq net.ipv6.conf.default.accept_dad=0
270
271 # enslave the veth-tX interface to the vrf-X in the access router
272 ip -netns ${rtname} link set ${rtveth} master vrf-${tid}
273 ip -netns ${rtname} addr add ${IPv6_HS_NETWORK}::254/64 dev ${rtveth} nodad
274 ip -netns ${rtname} link set ${rtveth} up
275
276 ip netns exec ${rtname} sysctl -wq net.ipv6.conf.${rtveth}.proxy_ndp=1
277
278 ip netns exec ${rtname} sh -c "echo 1 > /proc/sys/net/vrf/strict_mode"
279}
280
281setup_vpn_config()
282{
283 local hssrc=$1
284 local rtsrc=$2
285 local hsdst=$3
286 local rtdst=$4
287 local tid=$5
288
289 eval local rtsrc_name=\${rt_${rtsrc}}
290 eval local rtdst_name=\${rt_${rtdst}}
291 local rtveth=veth-t${tid}
292 local vpn_sid=${VPN_LOCATOR_SERVICE}:${hssrc}${hsdst}:${tid}::6006
293
294 ip -netns ${rtsrc_name} -6 neigh add proxy ${IPv6_HS_NETWORK}::${hsdst} dev ${rtveth}
295
296 # set the encap route for encapsulating packets which arrive from the
297 # host hssrc and destined to the access router rtsrc.
298 ip -netns ${rtsrc_name} -6 route add ${IPv6_HS_NETWORK}::${hsdst}/128 vrf vrf-${tid} \
299 encap seg6 mode encap segs ${vpn_sid} dev veth0
300 ip -netns ${rtsrc_name} -6 route add ${vpn_sid}/128 vrf vrf-${tid} \
301 via fd00::${rtdst} dev veth0
302
303 # set the decap route for decapsulating packets which arrive from
304 # the rtdst router and destined to the hsdst host.
305 ip -netns ${rtdst_name} -6 route add ${vpn_sid}/128 table ${LOCALSID_TABLE_ID} \
306 encap seg6local action End.DT6 vrftable ${tid} dev vrf-${tid}
307
308 # all sids for VPNs start with a common locator which is fc00::/16.
309 # Routes for handling the SRv6 End.DT6 behavior instances are grouped
310 # together in the 'localsid' table.
311 #
312 # NOTE: added only once
313 if [ -z "$(ip -netns ${rtdst_name} -6 rule show | \
314 grep "to ${VPN_LOCATOR_SERVICE}::/16 lookup ${LOCALSID_TABLE_ID}")" ]; then
315 ip -netns ${rtdst_name} -6 rule add \
316 to ${VPN_LOCATOR_SERVICE}::/16 \
317 lookup ${LOCALSID_TABLE_ID} prio 999
318 fi
319}
320
321setup()
322{
323 ip link add veth-rt-1 type veth peer name veth-rt-2
324 # setup the networking for router rt-1 and router rt-2
325 setup_ns rt_1 rt_2
326 setup_rt_networking 1
327 setup_rt_networking 2
328
329 # setup two hosts for the tenant 100.
330 # - host hs-1 is directly connected to the router rt-1;
331 # - host hs-2 is directly connected to the router rt-2.
332 setup_ns hs_t100_1 hs_t100_2
333 setup_hs 1 1 100 #args: host router tenant
334 setup_hs 2 2 100
335
336 # setup two hosts for the tenant 200
337 # - host hs-3 is directly connected to the router rt-1;
338 # - host hs-4 is directly connected to the router rt-2.
339 setup_ns hs_t200_3 hs_t200_4
340 setup_hs 3 1 200
341 setup_hs 4 2 200
342
343 # setup the IPv6 L3 VPN which connects the host hs-t100-1 and host
344 # hs-t100-2 within the same tenant 100.
345 setup_vpn_config 1 1 2 2 100 #args: src_host src_router dst_host dst_router tenant
346 setup_vpn_config 2 2 1 1 100
347
348 # setup the IPv6 L3 VPN which connects the host hs-t200-3 and host
349 # hs-t200-4 within the same tenant 200.
350 setup_vpn_config 3 1 4 2 200
351 setup_vpn_config 4 2 3 1 200
352}
353
354check_rt_connectivity()
355{
356 local rtsrc=$1
357 local rtdst=$2
358 eval local nsname=\${rt_${rtsrc}}
359
360 ip netns exec ${nsname} ping -c 1 -W 1 ${IPv6_RT_NETWORK}::${rtdst} \
361 >/dev/null 2>&1
362}
363
364check_and_log_rt_connectivity()
365{
366 local rtsrc=$1
367 local rtdst=$2
368
369 check_rt_connectivity ${rtsrc} ${rtdst}
370 log_test $? 0 "Routers connectivity: rt-${rtsrc} -> rt-${rtdst}"
371}
372
373check_hs_connectivity()
374{
375 local hssrc=$1
376 local hsdst=$2
377 local tid=$3
378 eval local nsname=\${hs_t${tid}_${hssrc}}
379
380 ip netns exec ${nsname} ping -c 1 -W ${PING_TIMEOUT_SEC} \
381 ${IPv6_HS_NETWORK}::${hsdst} >/dev/null 2>&1
382}
383
384check_and_log_hs_connectivity()
385{
386 local hssrc=$1
387 local hsdst=$2
388 local tid=$3
389
390 check_hs_connectivity ${hssrc} ${hsdst} ${tid}
391 log_test $? 0 "Hosts connectivity: hs-t${tid}-${hssrc} -> hs-t${tid}-${hsdst} (tenant ${tid})"
392}
393
394check_and_log_hs_isolation()
395{
396 local hssrc=$1
397 local tidsrc=$2
398 local hsdst=$3
399 local tiddst=$4
400
401 check_hs_connectivity ${hssrc} ${hsdst} ${tidsrc}
402 # NOTE: ping should fail
403 log_test $? 1 "Hosts isolation: hs-t${tidsrc}-${hssrc} -X-> hs-t${tiddst}-${hsdst}"
404}
405
406
407check_and_log_hs2gw_connectivity()
408{
409 local hssrc=$1
410 local tid=$2
411
412 check_hs_connectivity ${hssrc} 254 ${tid}
413 log_test $? 0 "Hosts connectivity: hs-t${tid}-${hssrc} -> gw (tenant ${tid})"
414}
415
416router_tests()
417{
418 log_section "IPv6 routers connectivity test"
419
420 check_and_log_rt_connectivity 1 2
421 check_and_log_rt_connectivity 2 1
422}
423
424host2gateway_tests()
425{
426 log_section "IPv6 connectivity test among hosts and gateway"
427
428 check_and_log_hs2gw_connectivity 1 100
429 check_and_log_hs2gw_connectivity 2 100
430
431 check_and_log_hs2gw_connectivity 3 200
432 check_and_log_hs2gw_connectivity 4 200
433}
434
435host_vpn_tests()
436{
437 log_section "SRv6 VPN connectivity test among hosts in the same tenant"
438
439 check_and_log_hs_connectivity 1 2 100
440 check_and_log_hs_connectivity 2 1 100
441
442 check_and_log_hs_connectivity 3 4 200
443 check_and_log_hs_connectivity 4 3 200
444}
445
446host_vpn_isolation_tests()
447{
448 local i
449 local j
450 local k
451 local tmp
452 local l1="1 2"
453 local l2="3 4"
454 local t1=100
455 local t2=200
456
457 log_section "SRv6 VPN isolation test among hosts in different tentants"
458
459 for k in 0 1; do
460 for i in ${l1}; do
461 for j in ${l2}; do
462 check_and_log_hs_isolation ${i} ${t1} ${j} ${t2}
463 done
464 done
465
466 # let us test the reverse path
467 tmp="${l1}"; l1="${l2}"; l2="${tmp}"
468 tmp=${t1}; t1=${t2}; t2=${tmp}
469 done
470}
471
472if [ "$(id -u)" -ne 0 ];then
473 echo "SKIP: Need root privileges"
474 exit $ksft_skip
475fi
476
477if [ ! -x "$(command -v ip)" ]; then
478 echo "SKIP: Could not run test without ip tool"
479 exit $ksft_skip
480fi
481
482modprobe vrf &>/dev/null
483if [ ! -e /proc/sys/net/vrf/strict_mode ]; then
484 echo "SKIP: vrf sysctl does not exist"
485 exit $ksft_skip
486fi
487
488cleanup &>/dev/null
489
490setup
491
492router_tests
493host2gateway_tests
494host_vpn_tests
495host_vpn_isolation_tests
496
497print_log_test_results
498
499cleanup &>/dev/null
500
501exit ${ret}