2 # SPDX-License-Identifier: GPL-2.0
4 # author: Andrea Mayer <andrea.mayer@uniroma2.it>
5 # author: Paolo Lungaroni <paolo.lungaroni@uniroma2.it>
7 # This test is designed for evaluating the new SRv6 End.DT46 Behavior used for
8 # implementing IPv4/IPv6 L3 VPN use cases.
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.
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.
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
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.
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.
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.
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.
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.
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.
57 # The ping response follows the same processing but this time the roles of rt-1
58 # and rt-2 are swapped.
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.
65 # +-------------------+ +-------------------+
67 # | hs-t100-1 netns | | hs-t100-2 netns |
69 # | +-------------+ | | +-------------+ |
70 # | | veth0 | | | | veth0 | |
71 # | | cafe::1/64 | | | | cafe::2/64 | |
72 # | | 10.0.0.1/24 | | | | 10.0.0.2/24 | |
73 # | +-------------+ | | +-------------+ |
75 # +-------------------+ +-------------------+
79 # +-----------------------------------+ +-----------------------------------+
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 # | +----+----+ | | +----+----+ |
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 +---------------- |
102 # +-----------------------------------+ +-----------------------------------+
107 # +-------------------+ +-------------------+
109 # | +-------------+ | | +-------------+ |
110 # | | veth0 | | | | veth0 | |
111 # | | cafe::3/64 | | | | cafe::4/64 | |
112 # | | 10.0.0.3/24 | | | | 10.0.0.4/24 | |
113 # | +-------------+ | | +-------------+ |
115 # | hs-t200-3 netns | | hs-t200-4 netns |
117 # +-------------------+ +-------------------+
120 # ~~~~~~~~~~~~~~~~~~~~~~~~~
121 # | Network configuration |
122 # ~~~~~~~~~~~~~~~~~~~~~~~~~
124 # rt-1: localsid table (table 90)
125 # +--------------------------------------------------+
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 # +--------------------------------------------------+
133 # rt-1: VRF tenant 100 (table 100)
134 # +---------------------------------------------------+
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 # +---------------------------------------------------+
146 # rt-1: VRF tenant 200 (table 200)
147 # +---------------------------------------------------+
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 # +---------------------------------------------------+
160 # rt-2: localsid table (table 90)
161 # +--------------------------------------------------+
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 # +--------------------------------------------------+
169 # rt-2: VRF tenant 100 (table 100)
170 # +---------------------------------------------------+
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 # +---------------------------------------------------+
182 # rt-2: VRF tenant 200 (table 200)
183 # +---------------------------------------------------+
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 # +---------------------------------------------------+
196 # Kselftest framework requirement - SKIP code is 4.
199 readonly LOCALSID_TABLE_ID=90
200 readonly IPv6_RT_NETWORK=fd00
201 readonly IPv6_HS_NETWORK=cafe
202 readonly IPv4_HS_NETWORK=10.0.0
203 readonly VPN_LOCATOR_SERVICE=fc00
208 PAUSE_ON_FAIL=${PAUSE_ON_FAIL:=no}
216 if [ ${rc} -eq ${expected} ]; then
217 nsuccess=$((nsuccess+1))
218 printf "\n TEST: %-60s [ OK ]\n" "${msg}"
222 printf "\n TEST: %-60s [FAIL]\n" "${msg}"
223 if [ "${PAUSE_ON_FAIL}" = "yes" ]; then
225 echo "hit enter to continue, 'q' to quit"
227 [ "$a" = "q" ] && exit 1
232 print_log_test_results()
234 if [ "$TESTS" != "none" ]; then
235 printf "\nTests passed: %3d\n" ${nsuccess}
236 printf "Tests failed: %3d\n" ${nfail}
243 echo "################################################################################"
244 echo "TEST SECTION: $*"
245 echo "################################################################################"
250 ip link del veth-rt-1 2>/dev/null || true
251 ip link del veth-rt-2 2>/dev/null || true
253 # destroy routers rt-* and hosts hs-*
254 for ns in $(ip netns show | grep -E 'rt-*|hs-*'); do
255 ip netns del ${ns} || true
259 # Setup the basic networking for the routers
260 setup_rt_networking()
263 local nsname=rt-${rt}
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
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
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
276 ip netns exec ${nsname} sysctl -wq net.ipv4.ip_forward=1
277 ip netns exec ${nsname} sysctl -wq net.ipv6.conf.all.forwarding=1
285 local hsname=hs-t${tid}-${hs}
286 local rtname=rt-${rt}
287 local rtveth=veth-t${tid}
289 # set the networking for the host
290 ip netns add ${hsname}
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
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
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
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
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
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
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
324 ip netns exec ${rtname} sh -c "echo 1 > /proc/sys/net/vrf/strict_mode"
335 local hssrc_name=hs-t${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
342 ip -netns ${rtsrc_name} -6 neigh add proxy ${IPv6_HS_NETWORK}::${hsdst} dev ${rtveth}
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
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}
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.
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
370 # set default routes to unreachable for both ipv4 and ipv6
371 ip -netns ${rtsrc_name} -6 route add unreachable default metric 4278198272 \
374 ip -netns ${rtsrc_name} -4 route add unreachable default metric 4278198272 \
380 ip link add veth-rt-1 type veth peer name veth-rt-2
381 # setup the networking for router rt-1 and router rt-2
382 setup_rt_networking 1
383 setup_rt_networking 2
385 # setup two hosts for the tenant 100.
386 # - host hs-1 is directly connected to the router rt-1;
387 # - host hs-2 is directly connected to the router rt-2.
388 setup_hs 1 1 100 #args: host router tenant
391 # setup two hosts for the tenant 200
392 # - host hs-3 is directly connected to the router rt-1;
393 # - host hs-4 is directly connected to the router rt-2.
397 # setup the IPv4/IPv6 L3 VPN which connects the host hs-t100-1 and host
398 # hs-t100-2 within the same tenant 100.
399 setup_vpn_config 1 1 2 2 100 #args: src_host src_router dst_host dst_router tenant
400 setup_vpn_config 2 2 1 1 100
402 # setup the IPv4/IPv6 L3 VPN which connects the host hs-t200-3 and host
403 # hs-t200-4 within the same tenant 200.
404 setup_vpn_config 3 1 4 2 200
405 setup_vpn_config 4 2 3 1 200
408 check_rt_connectivity()
413 ip netns exec rt-${rtsrc} ping -c 1 -W 1 ${IPv6_RT_NETWORK}::${rtdst} \
417 check_and_log_rt_connectivity()
422 check_rt_connectivity ${rtsrc} ${rtdst}
423 log_test $? 0 "Routers connectivity: rt-${rtsrc} -> rt-${rtdst}"
426 check_hs_ipv6_connectivity()
432 ip netns exec hs-t${tid}-${hssrc} ping -c 1 -W ${PING_TIMEOUT_SEC} \
433 ${IPv6_HS_NETWORK}::${hsdst} >/dev/null 2>&1
436 check_hs_ipv4_connectivity()
442 ip netns exec hs-t${tid}-${hssrc} ping -c 1 -W ${PING_TIMEOUT_SEC} \
443 ${IPv4_HS_NETWORK}.${hsdst} >/dev/null 2>&1
446 check_and_log_hs_connectivity()
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})"
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})"
460 check_and_log_hs_isolation()
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}"
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}"
478 check_and_log_hs2gw_connectivity()
483 check_hs_ipv6_connectivity ${hssrc} 254 ${tid}
484 log_test $? 0 "IPv6 Hosts connectivity: hs-t${tid}-${hssrc} -> gw (tenant ${tid})"
486 check_hs_ipv4_connectivity ${hssrc} 254 ${tid}
487 log_test $? 0 "IPv4 Hosts connectivity: hs-t${tid}-${hssrc} -> gw (tenant ${tid})"
493 log_section "IPv6 routers connectivity test"
495 check_and_log_rt_connectivity 1 2
496 check_and_log_rt_connectivity 2 1
501 log_section "IPv4/IPv6 connectivity test among hosts and gateway"
503 check_and_log_hs2gw_connectivity 1 100
504 check_and_log_hs2gw_connectivity 2 100
506 check_and_log_hs2gw_connectivity 3 200
507 check_and_log_hs2gw_connectivity 4 200
512 log_section "SRv6 VPN connectivity test among hosts in the same tenant"
514 check_and_log_hs_connectivity 1 2 100
515 check_and_log_hs_connectivity 2 1 100
517 check_and_log_hs_connectivity 3 4 200
518 check_and_log_hs_connectivity 4 3 200
521 host_vpn_isolation_tests()
532 log_section "SRv6 VPN isolation test among hosts in different tentants"
537 check_and_log_hs_isolation ${i} ${t1} ${j} ${t2}
541 # let us test the reverse path
542 tmp="${l1}"; l1="${l2}"; l2="${tmp}"
543 tmp=${t1}; t1=${t2}; t2=${tmp}
547 if [ "$(id -u)" -ne 0 ];then
548 echo "SKIP: Need root privileges"
552 if [ ! -x "$(command -v ip)" ]; then
553 echo "SKIP: Could not run test without ip tool"
557 modprobe vrf &>/dev/null
558 if [ ! -e /proc/sys/net/vrf/strict_mode ]; then
559 echo "SKIP: vrf sysctl does not exist"
570 host_vpn_isolation_tests
572 print_log_test_results