2 # SPDX-License-Identifier: GPL-2.0
4 # author: Andrea Mayer <andrea.mayer@uniroma2.it>
5 # author: Paolo Lungaroni <paolo.lungaroni@cnit.it>
7 # This test is designed for evaluating the new SRv6 End.DT6 behavior used for
8 # implementing IPv6 L3 VPN use cases.
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.
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
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
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.
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
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.
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.
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.
48 # The ping response follows the same processing but this time the role of rt-1
49 # and rt-2 are swapped.
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.
56 # +-------------------+ +-------------------+
58 # | hs-t100-1 netns | | hs-t100-2 netns |
60 # | +-------------+ | | +-------------+ |
61 # | | veth0 | | | | veth0 | |
62 # | | cafe::1/64 | | | | cafe::2/64 | |
63 # | +-------------+ | | +-------------+ |
65 # +-------------------+ +-------------------+
69 # +-----------------------------------+ +-----------------------------------+
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 # | +----+----+ | | +----+----+ |
85 # | +-------+-------+ | | +-------+-------- |
86 # | | veth-t200 | | | | veth-t200 | |
87 # | | cafe::254/64 | | | | cafe::254/64 | |
88 # | +---------------+ rt-1 netns | | rt-2 netns +---------------- |
90 # +-----------------------------------+ +-----------------------------------+
95 # +-------------------+ +-------------------+
97 # | +-------------+ | | +-------------+ |
98 # | | veth0 | | | | veth0 | |
99 # | | cafe::3/64 | | | | cafe::4/64 | |
100 # | +-------------+ | | +-------------+ |
102 # | hs-t200-3 netns | | hs-t200-4 netns |
104 # +-------------------+ +-------------------+
107 # ~~~~~~~~~~~~~~~~~~~~~~~~~
108 # | Network configuration |
109 # ~~~~~~~~~~~~~~~~~~~~~~~~~
111 # rt-1: localsid table (table 90)
112 # +-------------------------------------------------+
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 # +-------------------------------------------------+
120 # rt-1: VRF tenant 100 (table 100)
121 # +---------------------------------------------------+
123 # +---------------------------------------------------+
124 # |cafe::2 |apply seg6 encap segs fc00:12:100::6006|
125 # +---------------------------------------------------+
126 # |cafe::/64 |forward to dev veth_t100 |
127 # +---------------------------------------------------+
129 # rt-1: VRF tenant 200 (table 200)
130 # +---------------------------------------------------+
132 # +---------------------------------------------------+
133 # |cafe::4 |apply seg6 encap segs fc00:12:200::6006|
134 # +---------------------------------------------------+
135 # |cafe::/64 |forward to dev veth_t200 |
136 # +---------------------------------------------------+
139 # rt-2: localsid table (table 90)
140 # +-------------------------------------------------+
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 # +-------------------------------------------------+
148 # rt-2: VRF tenant 100 (table 100)
149 # +---------------------------------------------------+
151 # +---------------------------------------------------+
152 # |cafe::1 |apply seg6 encap segs fc00:21:100::6006|
153 # +---------------------------------------------------+
154 # |cafe::/64 |forward to dev veth_t100 |
155 # +---------------------------------------------------+
157 # rt-2: VRF tenant 200 (table 200)
158 # +---------------------------------------------------+
160 # +---------------------------------------------------+
161 # |cafe::3 |apply seg6 encap segs fc00:21:200::6006|
162 # +---------------------------------------------------+
163 # |cafe::/64 |forward to dev veth_t200 |
164 # +---------------------------------------------------+
167 # Kselftest framework requirement - SKIP code is 4.
170 readonly LOCALSID_TABLE_ID=90
171 readonly IPv6_RT_NETWORK=fd00
172 readonly IPv6_HS_NETWORK=cafe
173 readonly VPN_LOCATOR_SERVICE=fc00
178 PAUSE_ON_FAIL=${PAUSE_ON_FAIL:=no}
186 if [ ${rc} -eq ${expected} ]; then
187 nsuccess=$((nsuccess+1))
188 printf "\n TEST: %-60s [ OK ]\n" "${msg}"
192 printf "\n TEST: %-60s [FAIL]\n" "${msg}"
193 if [ "${PAUSE_ON_FAIL}" = "yes" ]; then
195 echo "hit enter to continue, 'q' to quit"
197 [ "$a" = "q" ] && exit 1
202 print_log_test_results()
204 if [ "$TESTS" != "none" ]; then
205 printf "\nTests passed: %3d\n" ${nsuccess}
206 printf "Tests failed: %3d\n" ${nfail}
213 echo "################################################################################"
214 echo "TEST SECTION: $*"
215 echo "################################################################################"
220 ip link del veth-rt-1 2>/dev/null || true
221 ip link del veth-rt-2 2>/dev/null || true
223 # destroy routers rt-* and hosts hs-*
224 for ns in $(ip netns show | grep -E 'rt-*|hs-*'); do
225 ip netns del ${ns} || true
229 # Setup the basic networking for the routers
230 setup_rt_networking()
233 local nsname=rt-${rt}
235 ip netns add ${nsname}
236 ip link set veth-rt-${rt} netns ${nsname}
237 ip -netns ${nsname} link set veth-rt-${rt} name veth0
239 ip netns exec ${nsname} sysctl -wq net.ipv6.conf.all.accept_dad=0
240 ip netns exec ${nsname} sysctl -wq net.ipv6.conf.default.accept_dad=0
242 ip -netns ${nsname} addr add ${IPv6_RT_NETWORK}::${rt}/64 dev veth0 nodad
243 ip -netns ${nsname} link set veth0 up
244 ip -netns ${nsname} link set lo up
246 ip netns exec ${nsname} sysctl -wq net.ipv6.conf.all.forwarding=1
254 local hsname=hs-t${tid}-${hs}
255 local rtname=rt-${rt}
256 local rtveth=veth-t${tid}
258 # set the networking for the host
259 ip netns add ${hsname}
261 ip netns exec ${hsname} sysctl -wq net.ipv6.conf.all.accept_dad=0
262 ip netns exec ${hsname} sysctl -wq net.ipv6.conf.default.accept_dad=0
264 ip -netns ${hsname} link add veth0 type veth peer name ${rtveth}
265 ip -netns ${hsname} link set ${rtveth} netns ${rtname}
266 ip -netns ${hsname} addr add ${IPv6_HS_NETWORK}::${hs}/64 dev veth0 nodad
267 ip -netns ${hsname} link set veth0 up
268 ip -netns ${hsname} link set lo up
270 # configure the VRF for the tenant X on the router which is directly
271 # connected to the source host.
272 ip -netns ${rtname} link add vrf-${tid} type vrf table ${tid}
273 ip -netns ${rtname} link set vrf-${tid} up
275 ip netns exec ${rtname} sysctl -wq net.ipv6.conf.all.accept_dad=0
276 ip netns exec ${rtname} sysctl -wq net.ipv6.conf.default.accept_dad=0
278 # enslave the veth-tX interface to the vrf-X in the access router
279 ip -netns ${rtname} link set ${rtveth} master vrf-${tid}
280 ip -netns ${rtname} addr add ${IPv6_HS_NETWORK}::254/64 dev ${rtveth} nodad
281 ip -netns ${rtname} link set ${rtveth} up
283 ip netns exec ${rtname} sysctl -wq net.ipv6.conf.${rtveth}.proxy_ndp=1
285 ip netns exec ${rtname} sh -c "echo 1 > /proc/sys/net/vrf/strict_mode"
296 local hssrc_name=hs-t${tid}-${hssrc}
297 local hsdst_name=hs-t${tid}-${hsdst}
298 local rtsrc_name=rt-${rtsrc}
299 local rtdst_name=rt-${rtdst}
300 local rtveth=veth-t${tid}
301 local vpn_sid=${VPN_LOCATOR_SERVICE}:${hssrc}${hsdst}:${tid}::6006
303 ip -netns ${rtsrc_name} -6 neigh add proxy ${IPv6_HS_NETWORK}::${hsdst} dev ${rtveth}
305 # set the encap route for encapsulating packets which arrive from the
306 # host hssrc and destined to the access router rtsrc.
307 ip -netns ${rtsrc_name} -6 route add ${IPv6_HS_NETWORK}::${hsdst}/128 vrf vrf-${tid} \
308 encap seg6 mode encap segs ${vpn_sid} dev veth0
309 ip -netns ${rtsrc_name} -6 route add ${vpn_sid}/128 vrf vrf-${tid} \
310 via fd00::${rtdst} dev veth0
312 # set the decap route for decapsulating packets which arrive from
313 # the rtdst router and destined to the hsdst host.
314 ip -netns ${rtdst_name} -6 route add ${vpn_sid}/128 table ${LOCALSID_TABLE_ID} \
315 encap seg6local action End.DT6 vrftable ${tid} dev vrf-${tid}
317 # all sids for VPNs start with a common locator which is fc00::/16.
318 # Routes for handling the SRv6 End.DT6 behavior instances are grouped
319 # together in the 'localsid' table.
321 # NOTE: added only once
322 if [ -z "$(ip -netns ${rtdst_name} -6 rule show | \
323 grep "to ${VPN_LOCATOR_SERVICE}::/16 lookup ${LOCALSID_TABLE_ID}")" ]; then
324 ip -netns ${rtdst_name} -6 rule add \
325 to ${VPN_LOCATOR_SERVICE}::/16 \
326 lookup ${LOCALSID_TABLE_ID} prio 999
332 ip link add veth-rt-1 type veth peer name veth-rt-2
333 # setup the networking for router rt-1 and router rt-2
334 setup_rt_networking 1
335 setup_rt_networking 2
337 # setup two hosts for the tenant 100.
338 # - host hs-1 is directly connected to the router rt-1;
339 # - host hs-2 is directly connected to the router rt-2.
340 setup_hs 1 1 100 #args: host router tenant
343 # setup two hosts for the tenant 200
344 # - host hs-3 is directly connected to the router rt-1;
345 # - host hs-4 is directly connected to the router rt-2.
349 # setup the IPv6 L3 VPN which connects the host hs-t100-1 and host
350 # hs-t100-2 within the same tenant 100.
351 setup_vpn_config 1 1 2 2 100 #args: src_host src_router dst_host dst_router tenant
352 setup_vpn_config 2 2 1 1 100
354 # setup the IPv6 L3 VPN which connects the host hs-t200-3 and host
355 # hs-t200-4 within the same tenant 200.
356 setup_vpn_config 3 1 4 2 200
357 setup_vpn_config 4 2 3 1 200
360 check_rt_connectivity()
365 ip netns exec rt-${rtsrc} ping -c 1 -W 1 ${IPv6_RT_NETWORK}::${rtdst} \
369 check_and_log_rt_connectivity()
374 check_rt_connectivity ${rtsrc} ${rtdst}
375 log_test $? 0 "Routers connectivity: rt-${rtsrc} -> rt-${rtdst}"
378 check_hs_connectivity()
384 ip netns exec hs-t${tid}-${hssrc} ping -c 1 -W ${PING_TIMEOUT_SEC} \
385 ${IPv6_HS_NETWORK}::${hsdst} >/dev/null 2>&1
388 check_and_log_hs_connectivity()
394 check_hs_connectivity ${hssrc} ${hsdst} ${tid}
395 log_test $? 0 "Hosts connectivity: hs-t${tid}-${hssrc} -> hs-t${tid}-${hsdst} (tenant ${tid})"
398 check_and_log_hs_isolation()
405 check_hs_connectivity ${hssrc} ${hsdst} ${tidsrc}
406 # NOTE: ping should fail
407 log_test $? 1 "Hosts isolation: hs-t${tidsrc}-${hssrc} -X-> hs-t${tiddst}-${hsdst}"
411 check_and_log_hs2gw_connectivity()
416 check_hs_connectivity ${hssrc} 254 ${tid}
417 log_test $? 0 "Hosts connectivity: hs-t${tid}-${hssrc} -> gw (tenant ${tid})"
422 log_section "IPv6 routers connectivity test"
424 check_and_log_rt_connectivity 1 2
425 check_and_log_rt_connectivity 2 1
430 log_section "IPv6 connectivity test among hosts and gateway"
432 check_and_log_hs2gw_connectivity 1 100
433 check_and_log_hs2gw_connectivity 2 100
435 check_and_log_hs2gw_connectivity 3 200
436 check_and_log_hs2gw_connectivity 4 200
441 log_section "SRv6 VPN connectivity test among hosts in the same tenant"
443 check_and_log_hs_connectivity 1 2 100
444 check_and_log_hs_connectivity 2 1 100
446 check_and_log_hs_connectivity 3 4 200
447 check_and_log_hs_connectivity 4 3 200
450 host_vpn_isolation_tests()
461 log_section "SRv6 VPN isolation test among hosts in different tentants"
466 check_and_log_hs_isolation ${i} ${t1} ${j} ${t2}
470 # let us test the reverse path
471 tmp="${l1}"; l1="${l2}"; l2="${tmp}"
472 tmp=${t1}; t1=${t2}; t2=${tmp}
476 if [ "$(id -u)" -ne 0 ];then
477 echo "SKIP: Need root privileges"
481 if [ ! -x "$(command -v ip)" ]; then
482 echo "SKIP: Could not run test without ip tool"
486 modprobe vrf &>/dev/null
487 if [ ! -e /proc/sys/net/vrf/strict_mode ]; then
488 echo "SKIP: vrf sysctl does not exist"
499 host_vpn_isolation_tests
501 print_log_test_results