tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
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
166source lib.sh
167
168readonly LOCALSID_TABLE_ID=90
169readonly IPv6_RT_NETWORK=fd00
170readonly IPv4_HS_NETWORK=10.0.0
171readonly VPN_LOCATOR_SERVICE=fc00
172PING_TIMEOUT_SEC=4
173
174ret=0
175
176PAUSE_ON_FAIL=${PAUSE_ON_FAIL:=no}
177
178log_test()
179{
180 local rc=$1
181 local expected=$2
182 local msg="$3"
183
184 if [ ${rc} -eq ${expected} ]; then
185 nsuccess=$((nsuccess+1))
186 printf "\n TEST: %-60s [ OK ]\n" "${msg}"
187 else
188 ret=1
189 nfail=$((nfail+1))
190 printf "\n TEST: %-60s [FAIL]\n" "${msg}"
191 if [ "${PAUSE_ON_FAIL}" = "yes" ]; then
192 echo
193 echo "hit enter to continue, 'q' to quit"
194 read a
195 [ "$a" = "q" ] && exit 1
196 fi
197 fi
198}
199
200print_log_test_results()
201{
202 if [ "$TESTS" != "none" ]; then
203 printf "\nTests passed: %3d\n" ${nsuccess}
204 printf "Tests failed: %3d\n" ${nfail}
205 fi
206}
207
208log_section()
209{
210 echo
211 echo "################################################################################"
212 echo "TEST SECTION: $*"
213 echo "################################################################################"
214}
215
216cleanup()
217{
218 ip link del veth-rt-1 2>/dev/null || true
219 ip link del veth-rt-2 2>/dev/null || true
220
221 cleanup_all_ns
222}
223
224# Setup the basic networking for the routers
225setup_rt_networking()
226{
227 local id=$1
228 eval local nsname=\${rt_${id}}
229
230 ip netns exec ${nsname} sysctl -wq net.ipv6.conf.all.accept_dad=0
231 ip netns exec ${nsname} sysctl -wq net.ipv6.conf.default.accept_dad=0
232
233 ip link set veth-rt-${id} netns ${nsname}
234 ip -netns ${nsname} link set veth-rt-${id} name veth0
235
236 ip -netns ${nsname} addr add ${IPv6_RT_NETWORK}::${id}/64 dev veth0 nodad
237 ip -netns ${nsname} link set veth0 up
238 ip -netns ${nsname} link set lo up
239
240 ip netns exec ${nsname} sysctl -wq net.ipv4.ip_forward=1
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 # disable the rp_filter otherwise the kernel gets confused about how
254 # to route decap ipv4 packets.
255 ip netns exec ${rtname} sysctl -wq net.ipv4.conf.all.rp_filter=0
256 ip netns exec ${rtname} sysctl -wq net.ipv4.conf.default.rp_filter=0
257
258 ip -netns ${hsname} link add veth0 type veth peer name ${rtveth}
259 ip -netns ${hsname} link set ${rtveth} netns ${rtname}
260 ip -netns ${hsname} addr add ${IPv4_HS_NETWORK}.${hid}/24 dev veth0
261 ip -netns ${hsname} link set veth0 up
262 ip -netns ${hsname} link set lo up
263
264 # configure the VRF for the tenant X on the router which is directly
265 # connected to the source host.
266 ip -netns ${rtname} link add vrf-${tid} type vrf table ${tid}
267 ip -netns ${rtname} link set vrf-${tid} up
268
269 # enslave the veth-tX interface to the vrf-X in the access router
270 ip -netns ${rtname} link set ${rtveth} master vrf-${tid}
271 ip -netns ${rtname} addr add ${IPv4_HS_NETWORK}.254/24 dev ${rtveth}
272 ip -netns ${rtname} link set ${rtveth} up
273
274 ip netns exec ${rtname} sysctl -wq net.ipv4.conf.${rtveth}.proxy_arp=1
275
276 ip netns exec ${rtname} sh -c "echo 1 > /proc/sys/net/vrf/strict_mode"
277}
278
279setup_vpn_config()
280{
281 local hssrc=$1
282 local rtsrc=$2
283 local hsdst=$3
284 local rtdst=$4
285 local tid=$5
286
287 eval local rtsrc_name=\${rt_${rtsrc}}
288 eval local rtdst_name=\${rt_${rtdst}}
289 local vpn_sid=${VPN_LOCATOR_SERVICE}:${hssrc}${hsdst}:${tid}::6004
290
291 # set the encap route for encapsulating packets which arrive from the
292 # host hssrc and destined to the access router rtsrc.
293 ip -netns ${rtsrc_name} -4 route add ${IPv4_HS_NETWORK}.${hsdst}/32 vrf vrf-${tid} \
294 encap seg6 mode encap segs ${vpn_sid} dev veth0
295 ip -netns ${rtsrc_name} -6 route add ${vpn_sid}/128 vrf vrf-${tid} \
296 via fd00::${rtdst} dev veth0
297
298 # set the decap route for decapsulating packets which arrive from
299 # the rtdst router and destined to the hsdst host.
300 ip -netns ${rtdst_name} -6 route add ${vpn_sid}/128 table ${LOCALSID_TABLE_ID} \
301 encap seg6local action End.DT4 vrftable ${tid} dev vrf-${tid}
302
303 # all sids for VPNs start with a common locator which is fc00::/16.
304 # Routes for handling the SRv6 End.DT4 behavior instances are grouped
305 # together in the 'localsid' table.
306 #
307 # NOTE: added only once
308 if [ -z "$(ip -netns ${rtdst_name} -6 rule show | \
309 grep "to ${VPN_LOCATOR_SERVICE}::/16 lookup ${LOCALSID_TABLE_ID}")" ]; then
310 ip -netns ${rtdst_name} -6 rule add \
311 to ${VPN_LOCATOR_SERVICE}::/16 \
312 lookup ${LOCALSID_TABLE_ID} prio 999
313 fi
314}
315
316setup()
317{
318 ip link add veth-rt-1 type veth peer name veth-rt-2
319 # setup the networking for router rt-1 and router rt-2
320 setup_ns rt_1 rt_2
321 setup_rt_networking 1
322 setup_rt_networking 2
323
324 # setup two hosts for the tenant 100.
325 # - host hs-1 is directly connected to the router rt-1;
326 # - host hs-2 is directly connected to the router rt-2.
327 setup_ns hs_t100_1 hs_t100_2
328 setup_hs 1 1 100 #args: host router tenant
329 setup_hs 2 2 100
330
331 # setup two hosts for the tenant 200
332 # - host hs-3 is directly connected to the router rt-1;
333 # - host hs-4 is directly connected to the router rt-2.
334 setup_ns hs_t200_3 hs_t200_4
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
349check_rt_connectivity()
350{
351 local rtsrc=$1
352 local rtdst=$2
353 eval local nsname=\${rt_${rtsrc}}
354
355 ip netns exec ${nsname} ping -c 1 -W 1 ${IPv6_RT_NETWORK}::${rtdst} \
356 >/dev/null 2>&1
357}
358
359check_and_log_rt_connectivity()
360{
361 local rtsrc=$1
362 local rtdst=$2
363
364 check_rt_connectivity ${rtsrc} ${rtdst}
365 log_test $? 0 "Routers connectivity: rt-${rtsrc} -> rt-${rtdst}"
366}
367
368check_hs_connectivity()
369{
370 local hssrc=$1
371 local hsdst=$2
372 local tid=$3
373 eval local nsname=\${hs_t${tid}_${hssrc}}
374
375 ip netns exec ${nsname} ping -c 1 -W ${PING_TIMEOUT_SEC} \
376 ${IPv4_HS_NETWORK}.${hsdst} >/dev/null 2>&1
377}
378
379check_and_log_hs_connectivity()
380{
381 local hssrc=$1
382 local hsdst=$2
383 local tid=$3
384
385 check_hs_connectivity ${hssrc} ${hsdst} ${tid}
386 log_test $? 0 "Hosts connectivity: hs-t${tid}-${hssrc} -> hs-t${tid}-${hsdst} (tenant ${tid})"
387}
388
389check_and_log_hs_isolation()
390{
391 local hssrc=$1
392 local tidsrc=$2
393 local hsdst=$3
394 local tiddst=$4
395
396 check_hs_connectivity ${hssrc} ${hsdst} ${tidsrc}
397 # NOTE: ping should fail
398 log_test $? 1 "Hosts isolation: hs-t${tidsrc}-${hssrc} -X-> hs-t${tiddst}-${hsdst}"
399}
400
401
402check_and_log_hs2gw_connectivity()
403{
404 local hssrc=$1
405 local tid=$2
406
407 check_hs_connectivity ${hssrc} 254 ${tid}
408 log_test $? 0 "Hosts connectivity: hs-t${tid}-${hssrc} -> gw (tenant ${tid})"
409}
410
411router_tests()
412{
413 log_section "IPv6 routers connectivity test"
414
415 check_and_log_rt_connectivity 1 2
416 check_and_log_rt_connectivity 2 1
417}
418
419host2gateway_tests()
420{
421 log_section "IPv4 connectivity test among hosts and gateway"
422
423 check_and_log_hs2gw_connectivity 1 100
424 check_and_log_hs2gw_connectivity 2 100
425
426 check_and_log_hs2gw_connectivity 3 200
427 check_and_log_hs2gw_connectivity 4 200
428}
429
430host_vpn_tests()
431{
432 log_section "SRv6 VPN connectivity test among hosts in the same tenant"
433
434 check_and_log_hs_connectivity 1 2 100
435 check_and_log_hs_connectivity 2 1 100
436
437 check_and_log_hs_connectivity 3 4 200
438 check_and_log_hs_connectivity 4 3 200
439}
440
441host_vpn_isolation_tests()
442{
443 local i
444 local j
445 local k
446 local tmp
447 local l1="1 2"
448 local l2="3 4"
449 local t1=100
450 local t2=200
451
452 log_section "SRv6 VPN isolation test among hosts in different tentants"
453
454 for k in 0 1; do
455 for i in ${l1}; do
456 for j in ${l2}; do
457 check_and_log_hs_isolation ${i} ${t1} ${j} ${t2}
458 done
459 done
460
461 # let us test the reverse path
462 tmp="${l1}"; l1="${l2}"; l2="${tmp}"
463 tmp=${t1}; t1=${t2}; t2=${tmp}
464 done
465}
466
467if [ "$(id -u)" -ne 0 ];then
468 echo "SKIP: Need root privileges"
469 exit $ksft_skip
470fi
471
472if [ ! -x "$(command -v ip)" ]; then
473 echo "SKIP: Could not run test without ip tool"
474 exit $ksft_skip
475fi
476
477modprobe vrf &>/dev/null
478if [ ! -e /proc/sys/net/vrf/strict_mode ]; then
479 echo "SKIP: vrf sysctl does not exist"
480 exit $ksft_skip
481fi
482
483cleanup &>/dev/null
484
485setup
486
487router_tests
488host2gateway_tests
489host_vpn_tests
490host_vpn_isolation_tests
491
492print_log_test_results
493
494cleanup &>/dev/null
495
496exit ${ret}