2 # SPDX-License-Identifier: GPL-2.0
4 # Check that route PMTU values match expectations, and that initial device MTU
5 # values are assigned correctly
7 # Tests currently implemented:
10 # Set up two namespaces, A and B, with two paths between them over routers
11 # R1 and R2 (also implemented with namespaces), with different MTUs:
13 # segment a_r1 segment b_r1 a_r1: 2000
14 # .--------------R1--------------. b_r1: 1400
16 # '--------------R2--------------' b_r2: 1500
17 # segment a_r2 segment b_r2
19 # Check that PMTU exceptions with the correct PMTU are created. Then
20 # decrease and increase the MTU of the local link for one of the paths,
21 # A to R1, checking that route exception PMTU changes accordingly over
22 # this path. Also check that locked exceptions are created when an ICMP
23 # message advertising a PMTU smaller than net.ipv4.route.min_pmtu is
27 # Same as pmtu_ipv4, except for locked PMTU tests, using IPv6
29 # - pmtu_ipv4_dscp_icmp_exception
30 # Set up the same network topology as pmtu_ipv4, but use non-default
31 # routing table in A. A fib-rule is used to jump to this routing table
32 # based on DSCP. Send ICMPv4 packets with the expected DSCP value and
33 # verify that ECN doesn't interfere with the creation of PMTU exceptions.
35 # - pmtu_ipv4_dscp_udp_exception
36 # Same as pmtu_ipv4_dscp_icmp_exception, but use UDP instead of ICMP.
38 # - pmtu_ipv4_vxlan4_exception
39 # Set up the same network topology as pmtu_ipv4, create a VXLAN tunnel
40 # over IPv4 between A and B, routed via R1. On the link between R1 and B,
41 # set a MTU lower than the VXLAN MTU and the MTU on the link between A and
42 # R1. Send IPv4 packets, exceeding the MTU between R1 and B, over VXLAN
43 # from A to B and check that the PMTU exception is created with the right
46 # - pmtu_ipv6_vxlan4_exception
47 # Same as pmtu_ipv4_vxlan4_exception, but send IPv6 packets from A to B
49 # - pmtu_ipv4_vxlan6_exception
50 # Same as pmtu_ipv4_vxlan4_exception, but use IPv6 transport from A to B
52 # - pmtu_ipv6_vxlan6_exception
53 # Same as pmtu_ipv4_vxlan6_exception, but send IPv6 packets from A to B
55 # - pmtu_ipv4_geneve4_exception
56 # Same as pmtu_ipv4_vxlan4_exception, but using a GENEVE tunnel instead of
59 # - pmtu_ipv6_geneve4_exception
60 # Same as pmtu_ipv6_vxlan4_exception, but using a GENEVE tunnel instead of
63 # - pmtu_ipv4_geneve6_exception
64 # Same as pmtu_ipv4_vxlan6_exception, but using a GENEVE tunnel instead of
67 # - pmtu_ipv6_geneve6_exception
68 # Same as pmtu_ipv6_vxlan6_exception, but using a GENEVE tunnel instead of
71 # - pmtu_ipv{4,6}_br_vxlan{4,6}_exception
72 # Set up three namespaces, A, B, and C, with routing between A and B over
73 # R1. R2 is unused in these tests. A has a veth connection to C, and is
74 # connected to B via a VXLAN endpoint, which is directly bridged to C.
75 # MTU on the B-R1 link is lower than other MTUs.
77 # Check that both C and A are able to communicate with B over the VXLAN
78 # tunnel, and that PMTU exceptions with the correct values are created.
80 # segment a_r1 segment b_r1 b_r1: 4000
81 # .--------------R1--------------. everything
82 # C---veth A B else: 5000
84 # '---- - - - - - VXLAN - - - - - - - '
86 # - pmtu_ipv{4,6}_br_geneve{4,6}_exception
87 # Same as pmtu_ipv{4,6}_br_vxlan{4,6}_exception, with a GENEVE tunnel
90 # - pmtu_ipv{4,6}_ovs_vxlan{4,6}_exception
91 # Set up two namespaces, B, and C, with routing between the init namespace
92 # and B over R1. A and R2 are unused in these tests. The init namespace
93 # has a veth connection to C, and is connected to B via a VXLAN endpoint,
94 # which is handled by Open vSwitch and bridged to C. MTU on the B-R1 link
95 # is lower than other MTUs.
97 # Check that C is able to communicate with B over the VXLAN tunnel, and
98 # that PMTU exceptions with the correct values are created.
100 # segment a_r1 segment b_r1 b_r1: 4000
101 # .--------------R1--------------. everything
102 # C---veth init B else: 5000
104 # '---- - - - - - VXLAN - - - - - - - '
106 # - pmtu_ipv{4,6}_ovs_geneve{4,6}_exception
107 # Same as pmtu_ipv{4,6}_ovs_vxlan{4,6}_exception, with a GENEVE tunnel
110 # - pmtu_ipv{4,6}_fou{4,6}_exception
111 # Same as pmtu_ipv4_vxlan4, but using a direct IPv4/IPv6 encapsulation
112 # (FoU) over IPv4/IPv6, instead of VXLAN
114 # - pmtu_ipv{4,6}_fou{4,6}_exception
115 # Same as pmtu_ipv4_vxlan4, but using a generic UDP IPv4/IPv6
116 # encapsulation (GUE) over IPv4/IPv6, instead of VXLAN
118 # - pmtu_ipv{4,6}_ipv{4,6}_exception
119 # Same as pmtu_ipv4_vxlan4, but using a IPv4/IPv6 tunnel over IPv4/IPv6,
122 # - pmtu_vti4_exception
123 # Set up vti tunnel on top of veth, with xfrm states and policies, in two
124 # namespaces with matching endpoints. Check that route exception is not
125 # created if link layer MTU is not exceeded, then exceed it and check that
126 # exception is created with the expected PMTU. The approach described
127 # below for IPv6 doesn't apply here, because, on IPv4, administrative MTU
128 # changes alone won't affect PMTU
130 # - pmtu_vti4_udp_exception
131 # Same as pmtu_vti4_exception, but using ESP-in-UDP
133 # - pmtu_vti4_udp_routed_exception
134 # Set up vti tunnel on top of veth connected through routing namespace and
135 # add xfrm states and policies with ESP-in-UDP encapsulation. Check that
136 # route exception is not created if link layer MTU is not exceeded, then
137 # lower MTU on second part of routed environment and check that exception
138 # is created with the expected PMTU.
140 # - pmtu_vti6_exception
141 # Set up vti6 tunnel on top of veth, with xfrm states and policies, in two
142 # namespaces with matching endpoints. Check that route exception is
143 # created by exceeding link layer MTU with ping to other endpoint. Then
144 # decrease and increase MTU of tunnel, checking that route exception PMTU
145 # changes accordingly
147 # - pmtu_vti6_udp_exception
148 # Same as pmtu_vti6_exception, but using ESP-in-UDP
150 # - pmtu_vti6_udp_routed_exception
151 # Same as pmtu_vti6_udp_routed_exception but with routing between vti
154 # - pmtu_vti4_default_mtu
155 # Set up vti4 tunnel on top of veth, in two namespaces with matching
156 # endpoints. Check that MTU assigned to vti interface is the MTU of the
157 # lower layer (veth) minus additional lower layer headers (zero, for veth)
158 # minus IPv4 header length
160 # - pmtu_vti6_default_mtu
161 # Same as above, for IPv6
163 # - pmtu_vti4_link_add_mtu
164 # Set up vti4 interface passing MTU value at link creation, check MTU is
165 # configured, and that link is not created with invalid MTU values
167 # - pmtu_vti6_link_add_mtu
168 # Same as above, for IPv6
170 # - pmtu_vti6_link_change_mtu
171 # Set up two dummy interfaces with different MTUs, create a vti6 tunnel
172 # and check that configured MTU is used on link creation and changes, and
173 # that MTU is properly calculated instead when MTU is not configured from
176 # - cleanup_ipv4_exception
177 # Similar to pmtu_ipv4_vxlan4_exception, but explicitly generate PMTU
178 # exceptions on multiple CPUs and check that the veth device tear-down
179 # happens in a timely manner
181 # - cleanup_ipv6_exception
182 # Same as above, but use IPv6 transport from A to B
184 # - list_flush_ipv4_exception
185 # Using the same topology as in pmtu_ipv4, create exceptions, and check
186 # they are shown when listing exception caches, gone after flushing them
188 # - list_flush_ipv6_exception
189 # Using the same topology as in pmtu_ipv6, create exceptions, and check
190 # they are shown when listing exception caches, gone after flushing them
192 # - pmtu_ipv4_route_change
193 # Use the same topology as in pmtu_ipv4, but issue a route replacement
194 # command and delete the corresponding device afterward. This tests for
195 # proper cleanup of the PMTU exceptions by the route replacement path.
196 # Device unregistration should complete successfully
198 # - pmtu_ipv6_route_change
199 # Same as above but with IPv6
201 # Kselftest framework requirement - SKIP code is 4.
208 # Some systems don't have a ping6 binary anymore
209 which ping6 > /dev/null 2>&1 && ping6=$(which ping6) || ping6=$(which ping)
211 # Name Description re-run with nh
213 pmtu_ipv4_exception ipv4: PMTU exceptions 1
214 pmtu_ipv6_exception ipv6: PMTU exceptions 1
215 pmtu_ipv4_dscp_icmp_exception ICMPv4 with DSCP and ECN: PMTU exceptions 1
216 pmtu_ipv4_dscp_udp_exception UDPv4 with DSCP and ECN: PMTU exceptions 1
217 pmtu_ipv4_vxlan4_exception IPv4 over vxlan4: PMTU exceptions 1
218 pmtu_ipv6_vxlan4_exception IPv6 over vxlan4: PMTU exceptions 1
219 pmtu_ipv4_vxlan6_exception IPv4 over vxlan6: PMTU exceptions 1
220 pmtu_ipv6_vxlan6_exception IPv6 over vxlan6: PMTU exceptions 1
221 pmtu_ipv4_geneve4_exception IPv4 over geneve4: PMTU exceptions 1
222 pmtu_ipv6_geneve4_exception IPv6 over geneve4: PMTU exceptions 1
223 pmtu_ipv4_geneve6_exception IPv4 over geneve6: PMTU exceptions 1
224 pmtu_ipv6_geneve6_exception IPv6 over geneve6: PMTU exceptions 1
225 pmtu_ipv4_br_vxlan4_exception IPv4, bridged vxlan4: PMTU exceptions 1
226 pmtu_ipv6_br_vxlan4_exception IPv6, bridged vxlan4: PMTU exceptions 1
227 pmtu_ipv4_br_vxlan6_exception IPv4, bridged vxlan6: PMTU exceptions 1
228 pmtu_ipv6_br_vxlan6_exception IPv6, bridged vxlan6: PMTU exceptions 1
229 pmtu_ipv4_br_geneve4_exception IPv4, bridged geneve4: PMTU exceptions 1
230 pmtu_ipv6_br_geneve4_exception IPv6, bridged geneve4: PMTU exceptions 1
231 pmtu_ipv4_br_geneve6_exception IPv4, bridged geneve6: PMTU exceptions 1
232 pmtu_ipv6_br_geneve6_exception IPv6, bridged geneve6: PMTU exceptions 1
233 pmtu_ipv4_ovs_vxlan4_exception IPv4, OVS vxlan4: PMTU exceptions 1
234 pmtu_ipv6_ovs_vxlan4_exception IPv6, OVS vxlan4: PMTU exceptions 1
235 pmtu_ipv4_ovs_vxlan6_exception IPv4, OVS vxlan6: PMTU exceptions 1
236 pmtu_ipv6_ovs_vxlan6_exception IPv6, OVS vxlan6: PMTU exceptions 1
237 pmtu_ipv4_ovs_geneve4_exception IPv4, OVS geneve4: PMTU exceptions 1
238 pmtu_ipv6_ovs_geneve4_exception IPv6, OVS geneve4: PMTU exceptions 1
239 pmtu_ipv4_ovs_geneve6_exception IPv4, OVS geneve6: PMTU exceptions 1
240 pmtu_ipv6_ovs_geneve6_exception IPv6, OVS geneve6: PMTU exceptions 1
241 pmtu_ipv4_fou4_exception IPv4 over fou4: PMTU exceptions 1
242 pmtu_ipv6_fou4_exception IPv6 over fou4: PMTU exceptions 1
243 pmtu_ipv4_fou6_exception IPv4 over fou6: PMTU exceptions 1
244 pmtu_ipv6_fou6_exception IPv6 over fou6: PMTU exceptions 1
245 pmtu_ipv4_gue4_exception IPv4 over gue4: PMTU exceptions 1
246 pmtu_ipv6_gue4_exception IPv6 over gue4: PMTU exceptions 1
247 pmtu_ipv4_gue6_exception IPv4 over gue6: PMTU exceptions 1
248 pmtu_ipv6_gue6_exception IPv6 over gue6: PMTU exceptions 1
249 pmtu_ipv4_ipv4_exception IPv4 over IPv4: PMTU exceptions 1
250 pmtu_ipv6_ipv4_exception IPv6 over IPv4: PMTU exceptions 1
251 pmtu_ipv4_ipv6_exception IPv4 over IPv6: PMTU exceptions 1
252 pmtu_ipv6_ipv6_exception IPv6 over IPv6: PMTU exceptions 1
253 pmtu_vti6_exception vti6: PMTU exceptions 0
254 pmtu_vti4_exception vti4: PMTU exceptions 0
255 pmtu_vti6_udp_exception vti6: PMTU exceptions (ESP-in-UDP) 0
256 pmtu_vti4_udp_exception vti4: PMTU exceptions (ESP-in-UDP) 0
257 pmtu_vti6_udp_routed_exception vti6: PMTU exceptions, routed (ESP-in-UDP) 0
258 pmtu_vti4_udp_routed_exception vti4: PMTU exceptions, routed (ESP-in-UDP) 0
259 pmtu_vti4_default_mtu vti4: default MTU assignment 0
260 pmtu_vti6_default_mtu vti6: default MTU assignment 0
261 pmtu_vti4_link_add_mtu vti4: MTU setting on link creation 0
262 pmtu_vti6_link_add_mtu vti6: MTU setting on link creation 0
263 pmtu_vti6_link_change_mtu vti6: MTU changes on link changes 0
264 cleanup_ipv4_exception ipv4: cleanup of cached exceptions 1
265 cleanup_ipv6_exception ipv6: cleanup of cached exceptions 1
266 list_flush_ipv4_exception ipv4: list and flush cached exceptions 1
267 list_flush_ipv6_exception ipv6: list and flush cached exceptions 1
268 pmtu_ipv4_route_change ipv4: PMTU exception w/route replace 1
269 pmtu_ipv6_route_change ipv6: PMTU exception w/route replace 1"
276 ns_a="ip netns exec ${NS_A}"
277 ns_b="ip netns exec ${NS_B}"
278 ns_c="ip netns exec ${NS_C}"
279 ns_r1="ip netns exec ${NS_R1}"
280 ns_r2="ip netns exec ${NS_R2}"
281 # Addressing and routing for tests with routers: four network segments, with
282 # index SEGMENT between 1 and 4, a common prefix (PREFIX4 or PREFIX6) and an
283 # identifier ID, which is 1 for hosts (A and B), 2 for routers (R1 and R2).
285 # - IPv4: PREFIX4.SEGMENT.ID (/24)
286 # - IPv6: PREFIX6:SEGMENT::ID (/64)
300 # Traffic from A to B goes through R1 by default, and through R2, if destined to
301 # B's address on the b_r2 segment.
302 # Traffic from B to A goes through R1.
303 # ns destination gateway
305 A default ${prefix4}.${a_r1}.2
306 A ${prefix4}.${b_r2}.1 ${prefix4}.${a_r2}.2
307 B default ${prefix4}.${b_r1}.2
309 A default ${prefix6}:${a_r1}::2
310 A ${prefix6}:${b_r2}::1 ${prefix6}:${a_r2}::2
311 B default ${prefix6}:${b_r1}::2
314 # ns family nh id destination gateway
316 A 4 41 ${prefix4}.${a_r1}.2 veth_A-R1
317 A 4 42 ${prefix4}.${a_r2}.2 veth_A-R2
318 B 4 41 ${prefix4}.${b_r1}.2 veth_B-R1
320 A 6 61 ${prefix6}:${a_r1}::2 veth_A-R1
321 A 6 62 ${prefix6}:${a_r2}::2 veth_A-R2
322 B 6 61 ${prefix6}:${b_r1}::2 veth_B-R1
325 # nexthop id correlates to id in nexthops config above
326 # ns family prefix nh id
329 A 4 ${prefix4}.${b_r2}.1 42
333 A 6 ${prefix6}:${b_r2}::1 62
340 veth4_a_addr="192.168.1.1"
341 veth4_b_addr="192.168.1.2"
342 veth4_c_addr="192.168.2.10"
344 veth6_a_addr="fd00:1::a"
345 veth6_b_addr="fd00:1::b"
346 veth6_c_addr="fd00:2::c"
349 tunnel4_a_addr="192.168.2.1"
350 tunnel4_b_addr="192.168.2.2"
352 tunnel6_a_addr="fd00:2::a"
353 tunnel6_b_addr="fd00:2::b"
356 dummy6_0_prefix="fc00:1000::"
357 dummy6_1_prefix="fc00:1001::"
367 err_buf="${err_buf}${1}
379 if [ "$VERBOSE" = "1" ]; then
380 printf " COMMAND: $cmd\n"
385 if [ "$VERBOSE" = "1" -a -n "$out" ]; then
396 if [ "$VERBOSE" = "1" ]; then
397 printf " COMMAND: %s &\n" "${cmd}"
403 # Find the auto-generated name for this namespace
413 if [ "${outer}" = "4" ]; then
414 modprobe fou || return $ksft_skip
415 a_addr="${prefix4}.${a_r1}.1"
416 b_addr="${prefix4}.${b_r1}.1"
417 if [ "${inner}" = "4" ]; then
425 modprobe fou6 || return $ksft_skip
426 a_addr="${prefix6}:${a_r1}::1"
427 b_addr="${prefix6}:${b_r1}::1"
428 if [ "${inner}" = "4" ]; then
439 run_cmd ${ns_a} ip fou add port 5555 ipproto ${ipproto} || return $ksft_skip
440 run_cmd ${ns_a} ip link add ${encap}_a type ${type} ${mode} local ${a_addr} remote ${b_addr} encap ${encap} encap-sport auto encap-dport 5556 || return $ksft_skip
442 run_cmd ${ns_b} ip fou add port 5556 ipproto ${ipproto}
443 run_cmd ${ns_b} ip link add ${encap}_b type ${type} ${mode} local ${b_addr} remote ${a_addr} encap ${encap} encap-sport auto encap-dport 5555
445 if [ "${inner}" = "4" ]; then
446 run_cmd ${ns_a} ip addr add ${tunnel4_a_addr}/${tunnel4_mask} dev ${encap}_a
447 run_cmd ${ns_b} ip addr add ${tunnel4_b_addr}/${tunnel4_mask} dev ${encap}_b
449 run_cmd ${ns_a} ip addr add ${tunnel6_a_addr}/${tunnel6_mask} dev ${encap}_a
450 run_cmd ${ns_b} ip addr add ${tunnel6_b_addr}/${tunnel6_mask} dev ${encap}_b
453 run_cmd ${ns_a} ip link set ${encap}_a up
454 run_cmd ${ns_b} ip link set ${encap}_b up
458 setup_fou_or_gue 4 4 fou
462 setup_fou_or_gue 4 6 fou
466 setup_fou_or_gue 6 4 fou
470 setup_fou_or_gue 6 6 fou
474 setup_fou_or_gue 4 4 gue
478 setup_fou_or_gue 4 6 gue
482 setup_fou_or_gue 6 4 gue
486 setup_fou_or_gue 6 6 gue
489 setup_ipvX_over_ipvY() {
493 if [ "${outer}" -eq 4 ]; then
494 a_addr="${prefix4}.${a_r1}.1"
495 b_addr="${prefix4}.${b_r1}.1"
496 if [ "${inner}" -eq 4 ]; then
504 a_addr="${prefix6}:${a_r1}::1"
505 b_addr="${prefix6}:${b_r1}::1"
507 if [ "${inner}" -eq 4 ]; then
514 run_cmd ${ns_a} ip link add ip_a type ${type} local ${a_addr} remote ${b_addr} mode ${mode} || return $ksft_skip
515 run_cmd ${ns_b} ip link add ip_b type ${type} local ${b_addr} remote ${a_addr} mode ${mode}
517 run_cmd ${ns_a} ip link set ip_a up
518 run_cmd ${ns_b} ip link set ip_b up
520 if [ "${inner}" = "4" ]; then
521 run_cmd ${ns_a} ip addr add ${tunnel4_a_addr}/${tunnel4_mask} dev ip_a
522 run_cmd ${ns_b} ip addr add ${tunnel4_b_addr}/${tunnel4_mask} dev ip_b
524 run_cmd ${ns_a} ip addr add ${tunnel6_a_addr}/${tunnel6_mask} dev ip_a
525 run_cmd ${ns_b} ip addr add ${tunnel6_b_addr}/${tunnel6_mask} dev ip_b
530 setup_ipvX_over_ipvY 4 4
534 setup_ipvX_over_ipvY 6 4
538 setup_ipvX_over_ipvY 4 6
542 setup_ipvX_over_ipvY 6 6
546 for n in ${NS_A} ${NS_B} ${NS_C} ${NS_R1} ${NS_R2}; do
547 ip netns add ${n} || return 1
549 # Disable DAD, so that we don't have to wait to use the
550 # configured IPv6 addresses
551 ip netns exec ${n} sysctl -q net/ipv6/conf/default/accept_dad=0
556 run_cmd ${ns_a} ip link add veth_a type veth peer name veth_b || return 1
557 run_cmd ${ns_a} ip link set veth_b netns ${NS_B}
559 run_cmd ${ns_a} ip addr add ${veth4_a_addr}/${veth4_mask} dev veth_a
560 run_cmd ${ns_b} ip addr add ${veth4_b_addr}/${veth4_mask} dev veth_b
562 run_cmd ${ns_a} ip addr add ${veth6_a_addr}/${veth6_mask} dev veth_a
563 run_cmd ${ns_b} ip addr add ${veth6_b_addr}/${veth6_mask} dev veth_b
565 run_cmd ${ns_a} ip link set veth_a up
566 run_cmd ${ns_b} ip link set veth_b up
577 [ ${proto} -eq 6 ] && vti_type="vti6" || vti_type="vti"
579 run_cmd ${ns_a} ip link add vti${proto}_a type ${vti_type} local ${veth_a_addr} remote ${veth_b_addr} key 10 || return 1
580 run_cmd ${ns_b} ip link add vti${proto}_b type ${vti_type} local ${veth_b_addr} remote ${veth_a_addr} key 10
582 run_cmd ${ns_a} ip addr add ${vti_a_addr}/${vti_mask} dev vti${proto}_a
583 run_cmd ${ns_b} ip addr add ${vti_b_addr}/${vti_mask} dev vti${proto}_b
585 run_cmd ${ns_a} ip link set vti${proto}_a up
586 run_cmd ${ns_b} ip link set vti${proto}_b up
590 setup_vti 4 ${veth4_a_addr} ${veth4_b_addr} ${tunnel4_a_addr} ${tunnel4_b_addr} ${tunnel4_mask}
594 setup_vti 6 ${veth6_a_addr} ${veth6_b_addr} ${tunnel6_a_addr} ${tunnel6_b_addr} ${tunnel6_mask}
598 setup_vti 4 ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1 ${tunnel4_a_addr} ${tunnel4_b_addr} ${tunnel4_mask}
602 setup_vti 6 ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 ${tunnel6_a_addr} ${tunnel6_b_addr} ${tunnel6_mask}
605 setup_vxlan_or_geneve() {
612 if [ "${type}" = "vxlan" ]; then
613 opts="${opts} ttl 64 dstport 4789"
614 opts_a="local ${a_addr}"
615 opts_b="local ${b_addr}"
621 run_cmd ${ns_a} ip link add ${type}_a type ${type} id 1 ${opts_a} remote ${b_addr} ${opts} || return 1
622 run_cmd ${ns_b} ip link add ${type}_b type ${type} id 1 ${opts_b} remote ${a_addr} ${opts}
624 if [ -n "${br_if_a}" ]; then
625 run_cmd ${ns_a} ip addr add ${tunnel4_a_addr}/${tunnel4_mask} dev ${br_if_a}
626 run_cmd ${ns_a} ip addr add ${tunnel6_a_addr}/${tunnel6_mask} dev ${br_if_a}
627 run_cmd ${ns_a} ip link set ${type}_a master ${br_if_a}
629 run_cmd ${ns_a} ip addr add ${tunnel4_a_addr}/${tunnel4_mask} dev ${type}_a
630 run_cmd ${ns_a} ip addr add ${tunnel6_a_addr}/${tunnel6_mask} dev ${type}_a
633 run_cmd ${ns_b} ip addr add ${tunnel4_b_addr}/${tunnel4_mask} dev ${type}_b
634 run_cmd ${ns_b} ip addr add ${tunnel6_b_addr}/${tunnel6_mask} dev ${type}_b
636 run_cmd ${ns_a} ip link set ${type}_a up
637 run_cmd ${ns_b} ip link set ${type}_b up
641 setup_vxlan_or_geneve geneve ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1 "df set"
645 setup_vxlan_or_geneve vxlan ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1 "df set"
649 setup_vxlan_or_geneve geneve ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 ""
653 setup_vxlan_or_geneve vxlan ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 ""
656 setup_bridged_geneve4() {
657 setup_vxlan_or_geneve geneve ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1 "df set" "br0"
660 setup_bridged_vxlan4() {
661 setup_vxlan_or_geneve vxlan ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1 "df set" "br0"
664 setup_bridged_geneve6() {
665 setup_vxlan_or_geneve geneve ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 "" "br0"
668 setup_bridged_vxlan6() {
669 setup_vxlan_or_geneve vxlan ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 "" "br0"
678 run_cmd ${ns_a} ip -${proto} xfrm state add src ${veth_a_addr} dst ${veth_b_addr} spi 0x1000 proto esp aead 'rfc4106(gcm(aes))' 0x0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f 128 mode tunnel ${encap} || return 1
679 run_cmd ${ns_a} ip -${proto} xfrm state add src ${veth_b_addr} dst ${veth_a_addr} spi 0x1001 proto esp aead 'rfc4106(gcm(aes))' 0x0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f 128 mode tunnel ${encap}
680 run_cmd ${ns_a} ip -${proto} xfrm policy add dir out mark 10 tmpl src ${veth_a_addr} dst ${veth_b_addr} proto esp mode tunnel
681 run_cmd ${ns_a} ip -${proto} xfrm policy add dir in mark 10 tmpl src ${veth_b_addr} dst ${veth_a_addr} proto esp mode tunnel
683 run_cmd ${ns_b} ip -${proto} xfrm state add src ${veth_a_addr} dst ${veth_b_addr} spi 0x1000 proto esp aead 'rfc4106(gcm(aes))' 0x0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f 128 mode tunnel ${encap}
684 run_cmd ${ns_b} ip -${proto} xfrm state add src ${veth_b_addr} dst ${veth_a_addr} spi 0x1001 proto esp aead 'rfc4106(gcm(aes))' 0x0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f 128 mode tunnel ${encap}
685 run_cmd ${ns_b} ip -${proto} xfrm policy add dir out mark 10 tmpl src ${veth_b_addr} dst ${veth_a_addr} proto esp mode tunnel
686 run_cmd ${ns_b} ip -${proto} xfrm policy add dir in mark 10 tmpl src ${veth_a_addr} dst ${veth_b_addr} proto esp mode tunnel
689 setup_nettest_xfrm() {
690 if ! which nettest >/dev/null; then
692 if ! which nettest >/dev/null; then
693 echo "'nettest' command not found; skipping tests"
698 [ ${1} -eq 6 ] && proto="-6" || proto=""
701 run_cmd_bg "${ns_a}" nettest "${proto}" -q -D -s -x -p "${port}" -t 5
702 nettest_pids="${nettest_pids} $!"
704 run_cmd_bg "${ns_b}" nettest "${proto}" -q -D -s -x -p "${port}" -t 5
705 nettest_pids="${nettest_pids} $!"
709 setup_xfrm 4 ${veth4_a_addr} ${veth4_b_addr}
713 setup_xfrm 6 ${veth6_a_addr} ${veth6_b_addr}
717 setup_xfrm 4 ${veth4_a_addr} ${veth4_b_addr} "encap espinudp 4500 4500 0.0.0.0"
718 setup_nettest_xfrm 4 4500
722 setup_xfrm 6 ${veth6_a_addr} ${veth6_b_addr} "encap espinudp 4500 4500 0.0.0.0"
723 setup_nettest_xfrm 6 4500
726 setup_xfrm4udprouted() {
727 setup_xfrm 4 ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1 "encap espinudp 4500 4500 0.0.0.0"
728 setup_nettest_xfrm 4 4500
731 setup_xfrm6udprouted() {
732 setup_xfrm 6 ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 "encap espinudp 4500 4500 0.0.0.0"
733 setup_nettest_xfrm 6 4500
736 setup_routing_old() {
737 for i in ${routes}; do
738 [ "${ns}" = "" ] && ns="${i}" && continue
739 [ "${addr}" = "" ] && addr="${i}" && continue
740 [ "${gw}" = "" ] && gw="${i}"
742 ns_name="$(nsname ${ns})"
744 ip -n "${ns_name}" route add "${addr}" table "${rt_table}" via "${gw}"
746 ns=""; addr=""; gw=""
750 setup_routing_new() {
751 for i in ${nexthops}; do
752 [ "${ns}" = "" ] && ns="${i}" && continue
753 [ "${fam}" = "" ] && fam="${i}" && continue
754 [ "${nhid}" = "" ] && nhid="${i}" && continue
755 [ "${gw}" = "" ] && gw="${i}" && continue
756 [ "${dev}" = "" ] && dev="${i}"
758 ns_name="$(nsname ${ns})"
760 ip -n ${ns_name} -${fam} nexthop add id ${nhid} via ${gw} dev ${dev}
762 ns=""; fam=""; nhid=""; gw=""; dev=""
766 for i in ${routes_nh}; do
767 [ "${ns}" = "" ] && ns="${i}" && continue
768 [ "${fam}" = "" ] && fam="${i}" && continue
769 [ "${addr}" = "" ] && addr="${i}" && continue
770 [ "${nhid}" = "" ] && nhid="${i}"
772 ns_name="$(nsname ${ns})"
774 ip -n "${ns_name}" -"${fam}" route add "${addr}" table "${rt_table}" nhid "${nhid}"
776 ns=""; fam=""; addr=""; nhid=""
781 for i in ${NS_R1} ${NS_R2}; do
782 ip netns exec ${i} sysctl -q net/ipv4/ip_forward=1
783 ip netns exec ${i} sysctl -q net/ipv6/conf/all/forwarding=1
786 for i in ${routing_addrs}; do
787 [ "${ns}" = "" ] && ns="${i}" && continue
788 [ "${peer}" = "" ] && peer="${i}" && continue
789 [ "${segment}" = "" ] && segment="${i}"
791 ns_name="$(nsname ${ns})"
792 peer_name="$(nsname ${peer})"
793 if="veth_${ns}-${peer}"
794 ifpeer="veth_${peer}-${ns}"
797 ip link add ${if} up netns ${ns_name} type veth peer name ${ifpeer} netns ${peer_name} || return 1
798 ip -n ${peer_name} link set dev ${ifpeer} up
801 ip -n ${ns_name} addr add ${prefix4}.${segment}.1/24 dev ${if}
802 ip -n ${ns_name} addr add ${prefix6}:${segment}::1/64 dev ${if}
804 ip -n ${peer_name} addr add ${prefix4}.${segment}.2/24 dev ${ifpeer}
805 ip -n ${peer_name} addr add ${prefix6}:${segment}::2/64 dev ${ifpeer}
807 ns=""; peer=""; segment=""
810 if [ "$USE_NH" = "yes" ]; then
819 setup_policy_routing() {
822 ip -netns "${NS_A}" -4 rule add dsfield "${policy_mark}" \
825 # Set the IPv4 Don't Fragment bit with tc, since socat doesn't seem to
826 # have an option do to it.
827 tc -netns "${NS_A}" qdisc replace dev veth_A-R1 root prio
828 tc -netns "${NS_A}" qdisc replace dev veth_A-R2 root prio
829 tc -netns "${NS_A}" filter add dev veth_A-R1 \
830 protocol ipv4 flower ip_proto udp \
831 action pedit ex munge ip df set 0x40 pipe csum ip and udp
832 tc -netns "${NS_A}" filter add dev veth_A-R2 \
833 protocol ipv4 flower ip_proto udp \
834 action pedit ex munge ip df set 0x40 pipe csum ip and udp
838 run_cmd ${ns_a} ip link add br0 type bridge || return $ksft_skip
839 run_cmd ${ns_a} ip link set br0 up
841 run_cmd ${ns_c} ip link add veth_C-A type veth peer name veth_A-C
842 run_cmd ${ns_c} ip link set veth_A-C netns ns-A
844 run_cmd ${ns_a} ip link set veth_A-C up
845 run_cmd ${ns_c} ip link set veth_C-A up
846 run_cmd ${ns_c} ip addr add ${veth4_c_addr}/${veth4_mask} dev veth_C-A
847 run_cmd ${ns_c} ip addr add ${veth6_c_addr}/${veth6_mask} dev veth_C-A
848 run_cmd ${ns_a} ip link set veth_A-C master br0
851 setup_ovs_vxlan_or_geneve() {
856 if [ "${type}" = "vxlan" ]; then
857 opts="${opts} ttl 64 dstport 4789"
858 opts_b="local ${b_addr}"
861 run_cmd ovs-vsctl add-port ovs_br0 ${type}_a -- \
862 set interface ${type}_a type=${type} \
863 options:remote_ip=${b_addr} options:key=1 options:csum=true || return 1
865 run_cmd ${ns_b} ip link add ${type}_b type ${type} id 1 ${opts_b} remote ${a_addr} ${opts} || return 1
867 run_cmd ${ns_b} ip addr add ${tunnel4_b_addr}/${tunnel4_mask} dev ${type}_b
868 run_cmd ${ns_b} ip addr add ${tunnel6_b_addr}/${tunnel6_mask} dev ${type}_b
870 run_cmd ${ns_b} ip link set ${type}_b up
873 setup_ovs_geneve4() {
874 setup_ovs_vxlan_or_geneve geneve ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1
878 setup_ovs_vxlan_or_geneve vxlan ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1
881 setup_ovs_geneve6() {
882 setup_ovs_vxlan_or_geneve geneve ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1
886 setup_ovs_vxlan_or_geneve vxlan ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1
890 run_cmd ovs-vsctl add-br ovs_br0 || return $ksft_skip
891 run_cmd ip link set ovs_br0 up
893 run_cmd ${ns_c} ip link add veth_C-A type veth peer name veth_A-C
894 run_cmd ${ns_c} ip link set veth_A-C netns 1
896 run_cmd ip link set veth_A-C up
897 run_cmd ${ns_c} ip link set veth_C-A up
898 run_cmd ${ns_c} ip addr add ${veth4_c_addr}/${veth4_mask} dev veth_C-A
899 run_cmd ${ns_c} ip addr add ${veth6_c_addr}/${veth6_mask} dev veth_C-A
900 run_cmd ovs-vsctl add-port ovs_br0 veth_A-C
902 # Move veth_A-R1 to init
903 run_cmd ${ns_a} ip link set veth_A-R1 netns 1
904 run_cmd ip addr add ${prefix4}.${a_r1}.1/${veth4_mask} dev veth_A-R1
905 run_cmd ip addr add ${prefix6}:${a_r1}::1/${veth6_mask} dev veth_A-R1
906 run_cmd ip link set veth_A-R1 up
907 run_cmd ip route add ${prefix4}.${b_r1}.1 via ${prefix4}.${a_r1}.2
908 run_cmd ip route add ${prefix6}:${b_r1}::1 via ${prefix6}:${a_r1}::2
912 [ "$(id -u)" -ne 0 ] && echo " need to run as root" && return $ksft_skip
915 eval setup_${arg} || { echo " ${arg} not supported"; return 1; }
920 [ $TRACING -eq 0 ] && return
923 [ "${ns_cmd}" = "" ] && ns_cmd="${arg}" && continue
924 ${ns_cmd} tcpdump --immediate-mode -s 0 -i "${arg}" -w "${name}_${arg}.pcap" 2> /dev/null &
925 tcpdump_pids="${tcpdump_pids} $!"
932 for pid in ${tcpdump_pids}; do
937 for pid in ${nettest_pids}; do
942 for pid in ${socat_pids}; do
947 for n in ${NS_A} ${NS_B} ${NS_C} ${NS_R1} ${NS_R2}; do
948 ip netns del ${n} 2> /dev/null
951 ip link del veth_A-C 2>/dev/null
952 ip link del veth_A-R1 2>/dev/null
953 ovs-vsctl --if-exists del-port vxlan_a 2>/dev/null
954 ovs-vsctl --if-exists del-br ovs_br0 2>/dev/null
963 ${ns_cmd} ip link set dev ${dev} mtu ${mtu}
970 for i in ${input}; do
971 [ ${next} -eq 1 -a "${i}" = "lock" ] && next=2 && continue
972 [ ${next} -eq 1 ] && echo "${i}" && return
973 [ ${next} -eq 2 ] && echo "lock ${i}" && return
974 [ "${i}" = "mtu" ] && next=1
982 ${ns_cmd} ip link show dev "${name}"
989 mtu_parse "$(link_get "${ns_cmd}" ${name})"
992 route_get_dst_exception() {
997 if [ -z "${dsfield}" ]; then
1001 ${ns_cmd} ip route get "${dst}" dsfield "${dsfield}"
1004 route_get_dst_pmtu_from_exception() {
1009 mtu_parse "$(route_get_dst_exception "${ns_cmd}" "${dst}" "${dsfield}")"
1012 check_pmtu_value() {
1017 [ "${expected}" = "any" ] && [ -n "${value}" ] && return 0
1018 [ "${value}" = "${expected}" ] && return 0
1019 [ -z "${value}" ] && err " PMTU exception wasn't created after ${event}" && return 1
1020 [ -z "${expected}" ] && err " PMTU exception shouldn't exist after ${event}" && return 1
1021 err " found PMTU exception with incorrect MTU ${value}, expected ${expected}, after ${event}"
1028 setup namespaces routing || return $ksft_skip
1029 trace "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \
1030 "${ns_r1}" veth_R1-B "${ns_b}" veth_B-R1 \
1031 "${ns_a}" veth_A-R2 "${ns_r2}" veth_R2-A \
1032 "${ns_r2}" veth_R2-B "${ns_b}" veth_B-R2
1034 if [ ${family} -eq 4 ]; then
1036 dst1="${prefix4}.${b_r1}.1"
1037 dst2="${prefix4}.${b_r2}.1"
1040 dst1="${prefix6}:${b_r1}::1"
1041 dst2="${prefix6}:${b_r2}::1"
1044 # Set up initial MTU values
1045 mtu "${ns_a}" veth_A-R1 2000
1046 mtu "${ns_r1}" veth_R1-A 2000
1047 mtu "${ns_r1}" veth_R1-B 1400
1048 mtu "${ns_b}" veth_B-R1 1400
1050 mtu "${ns_a}" veth_A-R2 2000
1051 mtu "${ns_r2}" veth_R2-A 2000
1052 mtu "${ns_r2}" veth_R2-B 1500
1053 mtu "${ns_b}" veth_B-R2 1500
1055 # Create route exceptions
1056 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1800 ${dst1}
1057 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1800 ${dst2}
1059 # Check that exceptions have been created with the correct PMTU
1060 pmtu_1="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst1})"
1061 check_pmtu_value "1400" "${pmtu_1}" "exceeding MTU" || return 1
1062 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})"
1063 check_pmtu_value "1500" "${pmtu_2}" "exceeding MTU" || return 1
1065 # Decrease local MTU below PMTU, check for PMTU decrease in route exception
1066 mtu "${ns_a}" veth_A-R1 1300
1067 mtu "${ns_r1}" veth_R1-A 1300
1068 pmtu_1="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst1})"
1069 check_pmtu_value "1300" "${pmtu_1}" "decreasing local MTU" || return 1
1070 # Second exception shouldn't be modified
1071 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})"
1072 check_pmtu_value "1500" "${pmtu_2}" "changing local MTU on a link not on this path" || return 1
1074 # Increase MTU, check for PMTU increase in route exception
1075 mtu "${ns_a}" veth_A-R1 1700
1076 mtu "${ns_r1}" veth_R1-A 1700
1077 pmtu_1="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst1})"
1078 check_pmtu_value "1700" "${pmtu_1}" "increasing local MTU" || return 1
1079 # Second exception shouldn't be modified
1080 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})"
1081 check_pmtu_value "1500" "${pmtu_2}" "changing local MTU on a link not on this path" || return 1
1083 # Skip PMTU locking tests for IPv6
1084 [ $family -eq 6 ] && return 0
1086 # Decrease remote MTU on path via R2, get new exception
1087 mtu "${ns_r2}" veth_R2-B 400
1088 mtu "${ns_b}" veth_B-R2 400
1089 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1400 ${dst2}
1090 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})"
1091 check_pmtu_value "lock 552" "${pmtu_2}" "exceeding MTU, with MTU < min_pmtu" || return 1
1093 # Decrease local MTU below PMTU
1094 mtu "${ns_a}" veth_A-R2 500
1095 mtu "${ns_r2}" veth_R2-A 500
1096 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})"
1097 check_pmtu_value "500" "${pmtu_2}" "decreasing local MTU" || return 1
1099 # Increase local MTU
1100 mtu "${ns_a}" veth_A-R2 1500
1101 mtu "${ns_r2}" veth_R2-A 1500
1102 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})"
1103 check_pmtu_value "1500" "${pmtu_2}" "increasing local MTU" || return 1
1106 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1400 ${dst2}
1107 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})"
1108 check_pmtu_value "lock 552" "${pmtu_2}" "exceeding MTU, with MTU < min_pmtu" || return 1
1111 test_pmtu_ipv4_exception() {
1115 test_pmtu_ipv6_exception() {
1119 test_pmtu_ipv4_dscp_icmp_exception() {
1122 setup namespaces policy_routing || return $ksft_skip
1123 trace "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \
1124 "${ns_r1}" veth_R1-B "${ns_b}" veth_B-R1 \
1125 "${ns_a}" veth_A-R2 "${ns_r2}" veth_R2-A \
1126 "${ns_r2}" veth_R2-B "${ns_b}" veth_B-R2
1128 # Set up initial MTU values
1129 mtu "${ns_a}" veth_A-R1 2000
1130 mtu "${ns_r1}" veth_R1-A 2000
1131 mtu "${ns_r1}" veth_R1-B 1400
1132 mtu "${ns_b}" veth_B-R1 1400
1134 mtu "${ns_a}" veth_A-R2 2000
1135 mtu "${ns_r2}" veth_R2-A 2000
1136 mtu "${ns_r2}" veth_R2-B 1500
1137 mtu "${ns_b}" veth_B-R2 1500
1139 len=$((2000 - 20 - 8)) # Fills MTU of veth_A-R1
1141 dst1="${prefix4}.${b_r1}.1"
1142 dst2="${prefix4}.${b_r2}.1"
1144 # Create route exceptions
1145 dsfield=${policy_mark} # No ECN bit set (Not-ECT)
1146 run_cmd "${ns_a}" ping -q -M want -Q "${dsfield}" -c 1 -w 1 -s "${len}" "${dst1}"
1148 dsfield=$(printf "%#x" $((policy_mark + 0x02))) # ECN=2 (ECT(0))
1149 run_cmd "${ns_a}" ping -q -M want -Q "${dsfield}" -c 1 -w 1 -s "${len}" "${dst2}"
1151 # Check that exceptions have been created with the correct PMTU
1152 pmtu_1="$(route_get_dst_pmtu_from_exception "${ns_a}" "${dst1}" "${policy_mark}")"
1153 check_pmtu_value "1400" "${pmtu_1}" "exceeding MTU" || return 1
1155 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" "${dst2}" "${policy_mark}")"
1156 check_pmtu_value "1500" "${pmtu_2}" "exceeding MTU" || return 1
1159 test_pmtu_ipv4_dscp_udp_exception() {
1162 if ! which socat > /dev/null 2>&1; then
1163 echo "'socat' command not found; skipping tests"
1167 setup namespaces policy_routing || return $ksft_skip
1168 trace "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \
1169 "${ns_r1}" veth_R1-B "${ns_b}" veth_B-R1 \
1170 "${ns_a}" veth_A-R2 "${ns_r2}" veth_R2-A \
1171 "${ns_r2}" veth_R2-B "${ns_b}" veth_B-R2
1173 # Set up initial MTU values
1174 mtu "${ns_a}" veth_A-R1 2000
1175 mtu "${ns_r1}" veth_R1-A 2000
1176 mtu "${ns_r1}" veth_R1-B 1400
1177 mtu "${ns_b}" veth_B-R1 1400
1179 mtu "${ns_a}" veth_A-R2 2000
1180 mtu "${ns_r2}" veth_R2-A 2000
1181 mtu "${ns_r2}" veth_R2-B 1500
1182 mtu "${ns_b}" veth_B-R2 1500
1184 len=$((2000 - 20 - 8)) # Fills MTU of veth_A-R1
1186 dst1="${prefix4}.${b_r1}.1"
1187 dst2="${prefix4}.${b_r2}.1"
1189 # Create route exceptions
1190 run_cmd_bg "${ns_b}" socat UDP-LISTEN:50000 OPEN:/dev/null,wronly=1
1191 socat_pids="${socat_pids} $!"
1193 dsfield=${policy_mark} # No ECN bit set (Not-ECT)
1194 run_cmd "${ns_a}" socat OPEN:/dev/zero,rdonly=1,readbytes="${len}" \
1195 UDP:"${dst1}":50000,tos="${dsfield}"
1197 dsfield=$(printf "%#x" $((policy_mark + 0x02))) # ECN=2 (ECT(0))
1198 run_cmd "${ns_a}" socat OPEN:/dev/zero,rdonly=1,readbytes="${len}" \
1199 UDP:"${dst2}":50000,tos="${dsfield}"
1201 # Check that exceptions have been created with the correct PMTU
1202 pmtu_1="$(route_get_dst_pmtu_from_exception "${ns_a}" "${dst1}" "${policy_mark}")"
1203 check_pmtu_value "1400" "${pmtu_1}" "exceeding MTU" || return 1
1204 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" "${dst2}" "${policy_mark}")"
1205 check_pmtu_value "1500" "${pmtu_2}" "exceeding MTU" || return 1
1208 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception() {
1214 if [ ${outer_family} -eq 4 ]; then
1215 setup namespaces routing ${type}4 || return $ksft_skip
1216 # IPv4 header UDP header VXLAN/GENEVE header Ethernet header
1217 exp_mtu=$((${ll_mtu} - 20 - 8 - 8 - 14))
1219 setup namespaces routing ${type}6 || return $ksft_skip
1220 # IPv6 header UDP header VXLAN/GENEVE header Ethernet header
1221 exp_mtu=$((${ll_mtu} - 40 - 8 - 8 - 14))
1224 trace "${ns_a}" ${type}_a "${ns_b}" ${type}_b \
1225 "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \
1226 "${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B
1228 if [ ${family} -eq 4 ]; then
1230 dst=${tunnel4_b_addr}
1233 dst=${tunnel6_b_addr}
1236 # Create route exception by exceeding link layer MTU
1237 mtu "${ns_a}" veth_A-R1 $((${ll_mtu} + 1000))
1238 mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000))
1239 mtu "${ns_b}" veth_B-R1 ${ll_mtu}
1240 mtu "${ns_r1}" veth_R1-B ${ll_mtu}
1242 mtu "${ns_a}" ${type}_a $((${ll_mtu} + 1000))
1243 mtu "${ns_b}" ${type}_b $((${ll_mtu} + 1000))
1244 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${dst}
1246 # Check that exception was created
1247 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst})"
1248 check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on ${type} interface"
1251 test_pmtu_ipv4_vxlan4_exception() {
1252 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception vxlan 4 4
1255 test_pmtu_ipv6_vxlan4_exception() {
1256 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception vxlan 6 4
1259 test_pmtu_ipv4_geneve4_exception() {
1260 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception geneve 4 4
1263 test_pmtu_ipv6_geneve4_exception() {
1264 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception geneve 6 4
1267 test_pmtu_ipv4_vxlan6_exception() {
1268 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception vxlan 4 6
1271 test_pmtu_ipv6_vxlan6_exception() {
1272 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception vxlan 6 6
1275 test_pmtu_ipv4_geneve6_exception() {
1276 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception geneve 4 6
1279 test_pmtu_ipv6_geneve6_exception() {
1280 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception geneve 6 6
1283 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception() {
1289 if [ ${outer_family} -eq 4 ]; then
1290 setup namespaces routing bridge bridged_${type}4 || return $ksft_skip
1291 # IPv4 header UDP header VXLAN/GENEVE header Ethernet header
1292 exp_mtu=$((${ll_mtu} - 20 - 8 - 8 - 14))
1294 setup namespaces routing bridge bridged_${type}6 || return $ksft_skip
1295 # IPv6 header UDP header VXLAN/GENEVE header Ethernet header
1296 exp_mtu=$((${ll_mtu} - 40 - 8 - 8 - 14))
1299 trace "${ns_a}" ${type}_a "${ns_b}" ${type}_b \
1300 "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \
1301 "${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B \
1302 "${ns_a}" br0 "${ns_a}" veth-A-C \
1305 if [ ${family} -eq 4 ]; then
1307 dst=${tunnel4_b_addr}
1310 dst=${tunnel6_b_addr}
1313 # Create route exception by exceeding link layer MTU
1314 mtu "${ns_a}" veth_A-R1 $((${ll_mtu} + 1000))
1315 mtu "${ns_a}" br0 $((${ll_mtu} + 1000))
1316 mtu "${ns_a}" veth_A-C $((${ll_mtu} + 1000))
1317 mtu "${ns_c}" veth_C-A $((${ll_mtu} + 1000))
1318 mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000))
1319 mtu "${ns_b}" veth_B-R1 ${ll_mtu}
1320 mtu "${ns_r1}" veth_R1-B ${ll_mtu}
1322 mtu "${ns_a}" ${type}_a $((${ll_mtu} + 1000))
1323 mtu "${ns_b}" ${type}_b $((${ll_mtu} + 1000))
1325 run_cmd ${ns_c} ${ping} -q -M want -i 0.1 -c 10 -s $((${ll_mtu} + 500)) ${dst} || return 1
1326 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${dst} || return 1
1328 # Check that exceptions were created
1329 pmtu="$(route_get_dst_pmtu_from_exception "${ns_c}" ${dst})"
1330 check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on bridged ${type} interface"
1331 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst})"
1332 check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on locally bridged ${type} interface"
1334 tmpoutfile=$(mktemp)
1336 # Flush Exceptions, retry with TCP
1337 run_cmd ${ns_a} ip route flush cached ${dst}
1338 run_cmd ${ns_b} ip route flush cached ${dst}
1339 run_cmd ${ns_c} ip route flush cached ${dst}
1341 for target in "${ns_a}" "${ns_c}" ; do
1342 if [ ${family} -eq 4 ]; then
1343 TCPDST=TCP:${dst}:50000
1345 TCPDST="TCP:[${dst}]:50000"
1347 ${ns_b} socat -T 3 -u -6 TCP-LISTEN:50000 STDOUT > $tmpoutfile &
1351 dd if=/dev/zero of=/dev/stdout status=none bs=1M count=1 | ${target} socat -T 3 -u STDIN $TCPDST,connect-timeout=3
1353 size=$(du -sb $tmpoutfile)
1354 size=${size%%/tmp/*}
1356 [ $size -ne 1048576 ] && err "File size $size mismatches exepcted value in locally bridged vxlan test" && return 1
1361 # Check that exceptions were created
1362 pmtu="$(route_get_dst_pmtu_from_exception "${ns_c}" ${dst})"
1363 check_pmtu_value ${exp_mtu} "${pmtu}" "tcp: exceeding link layer MTU on bridged ${type} interface"
1364 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst})"
1365 check_pmtu_value ${exp_mtu} "${pmtu}" "tcp exceeding link layer MTU on locally bridged ${type} interface"
1368 test_pmtu_ipv4_br_vxlan4_exception() {
1369 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception vxlan 4 4
1372 test_pmtu_ipv6_br_vxlan4_exception() {
1373 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception vxlan 6 4
1376 test_pmtu_ipv4_br_geneve4_exception() {
1377 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception geneve 4 4
1380 test_pmtu_ipv6_br_geneve4_exception() {
1381 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception geneve 6 4
1384 test_pmtu_ipv4_br_vxlan6_exception() {
1385 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception vxlan 4 6
1388 test_pmtu_ipv6_br_vxlan6_exception() {
1389 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception vxlan 6 6
1392 test_pmtu_ipv4_br_geneve6_exception() {
1393 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception geneve 4 6
1396 test_pmtu_ipv6_br_geneve6_exception() {
1397 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception geneve 6 6
1400 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception() {
1406 if [ ${outer_family} -eq 4 ]; then
1407 setup namespaces routing ovs_bridge ovs_${type}4 || return $ksft_skip
1408 # IPv4 header UDP header VXLAN/GENEVE header Ethernet header
1409 exp_mtu=$((${ll_mtu} - 20 - 8 - 8 - 14))
1411 setup namespaces routing ovs_bridge ovs_${type}6 || return $ksft_skip
1412 # IPv6 header UDP header VXLAN/GENEVE header Ethernet header
1413 exp_mtu=$((${ll_mtu} - 40 - 8 - 8 - 14))
1416 if [ "${type}" = "vxlan" ]; then
1417 tun_a="vxlan_sys_4789"
1418 elif [ "${type}" = "geneve" ]; then
1419 tun_a="genev_sys_6081"
1422 trace "" "${tun_a}" "${ns_b}" ${type}_b \
1423 "" veth_A-R1 "${ns_r1}" veth_R1-A \
1424 "${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B \
1425 "" ovs_br0 "" veth-A-C \
1428 if [ ${family} -eq 4 ]; then
1430 dst=${tunnel4_b_addr}
1433 dst=${tunnel6_b_addr}
1436 # Create route exception by exceeding link layer MTU
1437 mtu "" veth_A-R1 $((${ll_mtu} + 1000))
1438 mtu "" ovs_br0 $((${ll_mtu} + 1000))
1439 mtu "" veth_A-C $((${ll_mtu} + 1000))
1440 mtu "${ns_c}" veth_C-A $((${ll_mtu} + 1000))
1441 mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000))
1442 mtu "${ns_b}" veth_B-R1 ${ll_mtu}
1443 mtu "${ns_r1}" veth_R1-B ${ll_mtu}
1445 mtu "" ${tun_a} $((${ll_mtu} + 1000))
1446 mtu "${ns_b}" ${type}_b $((${ll_mtu} + 1000))
1448 run_cmd ${ns_c} ${ping} -q -M want -i 0.1 -c 20 -s $((${ll_mtu} + 500)) ${dst} || return 1
1450 # Check that exceptions were created
1451 pmtu="$(route_get_dst_pmtu_from_exception "${ns_c}" ${dst})"
1452 check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on Open vSwitch ${type} interface"
1455 test_pmtu_ipv4_ovs_vxlan4_exception() {
1456 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception vxlan 4 4
1459 test_pmtu_ipv6_ovs_vxlan4_exception() {
1460 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception vxlan 6 4
1463 test_pmtu_ipv4_ovs_geneve4_exception() {
1464 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception geneve 4 4
1467 test_pmtu_ipv6_ovs_geneve4_exception() {
1468 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception geneve 6 4
1471 test_pmtu_ipv4_ovs_vxlan6_exception() {
1472 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception vxlan 4 6
1475 test_pmtu_ipv6_ovs_vxlan6_exception() {
1476 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception vxlan 6 6
1479 test_pmtu_ipv4_ovs_geneve6_exception() {
1480 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception geneve 4 6
1483 test_pmtu_ipv6_ovs_geneve6_exception() {
1484 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception geneve 6 6
1487 test_pmtu_ipvX_over_fouY_or_gueY() {
1493 setup namespaces routing ${encap}${outer_family}${inner_family} || return $ksft_skip
1494 trace "${ns_a}" ${encap}_a "${ns_b}" ${encap}_b \
1495 "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \
1496 "${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B
1498 if [ ${inner_family} -eq 4 ]; then
1500 dst=${tunnel4_b_addr}
1503 dst=${tunnel6_b_addr}
1506 if [ "${encap}" = "gue" ]; then
1512 if [ ${outer_family} -eq 4 ]; then
1513 # IPv4 header UDP header
1514 exp_mtu=$((${ll_mtu} - 20 - 8 - ${encap_overhead}))
1516 # IPv6 header Option 4 UDP header
1517 exp_mtu=$((${ll_mtu} - 40 - 8 - 8 - ${encap_overhead}))
1520 # Create route exception by exceeding link layer MTU
1521 mtu "${ns_a}" veth_A-R1 $((${ll_mtu} + 1000))
1522 mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000))
1523 mtu "${ns_b}" veth_B-R1 ${ll_mtu}
1524 mtu "${ns_r1}" veth_R1-B ${ll_mtu}
1526 mtu "${ns_a}" ${encap}_a $((${ll_mtu} + 1000))
1527 mtu "${ns_b}" ${encap}_b $((${ll_mtu} + 1000))
1528 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${dst}
1530 # Check that exception was created
1531 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst})"
1532 check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on ${encap} interface"
1535 test_pmtu_ipv4_fou4_exception() {
1536 test_pmtu_ipvX_over_fouY_or_gueY 4 4 fou
1539 test_pmtu_ipv6_fou4_exception() {
1540 test_pmtu_ipvX_over_fouY_or_gueY 6 4 fou
1543 test_pmtu_ipv4_fou6_exception() {
1544 test_pmtu_ipvX_over_fouY_or_gueY 4 6 fou
1547 test_pmtu_ipv6_fou6_exception() {
1548 test_pmtu_ipvX_over_fouY_or_gueY 6 6 fou
1551 test_pmtu_ipv4_gue4_exception() {
1552 test_pmtu_ipvX_over_fouY_or_gueY 4 4 gue
1555 test_pmtu_ipv6_gue4_exception() {
1556 test_pmtu_ipvX_over_fouY_or_gueY 6 4 gue
1559 test_pmtu_ipv4_gue6_exception() {
1560 test_pmtu_ipvX_over_fouY_or_gueY 4 6 gue
1563 test_pmtu_ipv6_gue6_exception() {
1564 test_pmtu_ipvX_over_fouY_or_gueY 6 6 gue
1567 test_pmtu_ipvX_over_ipvY_exception() {
1572 setup namespaces routing ip${inner}ip${outer} || return $ksft_skip
1574 trace "${ns_a}" ip_a "${ns_b}" ip_b \
1575 "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \
1576 "${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B
1578 if [ ${inner} -eq 4 ]; then
1580 dst=${tunnel4_b_addr}
1583 dst=${tunnel6_b_addr}
1586 if [ ${outer} -eq 4 ]; then
1588 exp_mtu=$((${ll_mtu} - 20))
1590 # IPv6 header Option 4
1591 exp_mtu=$((${ll_mtu} - 40 - 8))
1594 # Create route exception by exceeding link layer MTU
1595 mtu "${ns_a}" veth_A-R1 $((${ll_mtu} + 1000))
1596 mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000))
1597 mtu "${ns_b}" veth_B-R1 ${ll_mtu}
1598 mtu "${ns_r1}" veth_R1-B ${ll_mtu}
1600 mtu "${ns_a}" ip_a $((${ll_mtu} + 1000)) || return
1601 mtu "${ns_b}" ip_b $((${ll_mtu} + 1000)) || return
1602 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${dst}
1604 # Check that exception was created
1605 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst})"
1606 check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on ip${inner}ip${outer} interface"
1609 test_pmtu_ipv4_ipv4_exception() {
1610 test_pmtu_ipvX_over_ipvY_exception 4 4
1613 test_pmtu_ipv6_ipv4_exception() {
1614 test_pmtu_ipvX_over_ipvY_exception 6 4
1617 test_pmtu_ipv4_ipv6_exception() {
1618 test_pmtu_ipvX_over_ipvY_exception 4 6
1621 test_pmtu_ipv6_ipv6_exception() {
1622 test_pmtu_ipvX_over_ipvY_exception 6 6
1625 test_pmtu_vti4_exception() {
1626 setup namespaces veth vti4 xfrm4 || return $ksft_skip
1627 trace "${ns_a}" veth_a "${ns_b}" veth_b \
1628 "${ns_a}" vti4_a "${ns_b}" vti4_b
1631 vti_mtu=$((veth_mtu - 20))
1633 # SPI SN IV ICV pad length next header
1634 esp_payload_rfc4106=$((vti_mtu - 4 - 4 - 8 - 16 - 1 - 1))
1635 ping_payload=$((esp_payload_rfc4106 - 28))
1637 mtu "${ns_a}" veth_a ${veth_mtu}
1638 mtu "${ns_b}" veth_b ${veth_mtu}
1639 mtu "${ns_a}" vti4_a ${vti_mtu}
1640 mtu "${ns_b}" vti4_b ${vti_mtu}
1642 # Send DF packet without exceeding link layer MTU, check that no
1643 # exception is created
1644 run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s ${ping_payload} ${tunnel4_b_addr}
1645 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel4_b_addr})"
1646 check_pmtu_value "" "${pmtu}" "sending packet smaller than PMTU (IP payload length ${esp_payload_rfc4106})" || return 1
1648 # Now exceed link layer MTU by one byte, check that exception is created
1649 # with the right PMTU value
1650 run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s $((ping_payload + 1)) ${tunnel4_b_addr}
1651 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel4_b_addr})"
1652 check_pmtu_value "${esp_payload_rfc4106}" "${pmtu}" "exceeding PMTU (IP payload length $((esp_payload_rfc4106 + 1)))"
1655 test_pmtu_vti6_exception() {
1656 setup namespaces veth vti6 xfrm6 || return $ksft_skip
1657 trace "${ns_a}" veth_a "${ns_b}" veth_b \
1658 "${ns_a}" vti6_a "${ns_b}" vti6_b
1661 # Create route exception by exceeding link layer MTU
1662 mtu "${ns_a}" veth_a 4000
1663 mtu "${ns_b}" veth_b 4000
1664 mtu "${ns_a}" vti6_a 5000
1665 mtu "${ns_b}" vti6_b 5000
1666 run_cmd ${ns_a} ${ping6} -q -i 0.1 -w 1 -s 60000 ${tunnel6_b_addr}
1668 # Check that exception was created
1669 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})"
1670 check_pmtu_value any "${pmtu}" "creating tunnel exceeding link layer MTU" || return 1
1672 # Decrease tunnel MTU, check for PMTU decrease in route exception
1673 mtu "${ns_a}" vti6_a 3000
1674 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})"
1675 check_pmtu_value "3000" "${pmtu}" "decreasing tunnel MTU" || fail=1
1677 # Increase tunnel MTU, check for PMTU increase in route exception
1678 mtu "${ns_a}" vti6_a 9000
1679 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})"
1680 check_pmtu_value "9000" "${pmtu}" "increasing tunnel MTU" || fail=1
1685 test_pmtu_vti4_udp_exception() {
1686 setup namespaces veth vti4 xfrm4udp || return $ksft_skip
1687 trace "${ns_a}" veth_a "${ns_b}" veth_b \
1688 "${ns_a}" vti4_a "${ns_b}" vti4_b
1691 vti_mtu=$((veth_mtu - 20))
1693 # UDP SPI SN IV ICV pad length next header
1694 esp_payload_rfc4106=$((vti_mtu - 8 - 4 - 4 - 8 - 16 - 1 - 1))
1695 ping_payload=$((esp_payload_rfc4106 - 28))
1697 mtu "${ns_a}" veth_a ${veth_mtu}
1698 mtu "${ns_b}" veth_b ${veth_mtu}
1699 mtu "${ns_a}" vti4_a ${vti_mtu}
1700 mtu "${ns_b}" vti4_b ${vti_mtu}
1702 # Send DF packet without exceeding link layer MTU, check that no
1703 # exception is created
1704 run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s ${ping_payload} ${tunnel4_b_addr}
1705 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel4_b_addr})"
1706 check_pmtu_value "" "${pmtu}" "sending packet smaller than PMTU (IP payload length ${esp_payload_rfc4106})" || return 1
1708 # Now exceed link layer MTU by one byte, check that exception is created
1709 # with the right PMTU value
1710 run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s $((ping_payload + 1)) ${tunnel4_b_addr}
1711 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel4_b_addr})"
1712 check_pmtu_value "${esp_payload_rfc4106}" "${pmtu}" "exceeding PMTU (IP payload length $((esp_payload_rfc4106 + 1)))"
1715 test_pmtu_vti6_udp_exception() {
1716 setup namespaces veth vti6 xfrm6udp || return $ksft_skip
1717 trace "${ns_a}" veth_a "${ns_b}" veth_b \
1718 "${ns_a}" vti6_a "${ns_b}" vti6_b
1721 # Create route exception by exceeding link layer MTU
1722 mtu "${ns_a}" veth_a 4000
1723 mtu "${ns_b}" veth_b 4000
1724 mtu "${ns_a}" vti6_a 5000
1725 mtu "${ns_b}" vti6_b 5000
1726 run_cmd ${ns_a} ${ping6} -q -i 0.1 -w 1 -s 60000 ${tunnel6_b_addr}
1728 # Check that exception was created
1729 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})"
1730 check_pmtu_value any "${pmtu}" "creating tunnel exceeding link layer MTU" || return 1
1732 # Decrease tunnel MTU, check for PMTU decrease in route exception
1733 mtu "${ns_a}" vti6_a 3000
1734 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})"
1735 check_pmtu_value "3000" "${pmtu}" "decreasing tunnel MTU" || fail=1
1737 # Increase tunnel MTU, check for PMTU increase in route exception
1738 mtu "${ns_a}" vti6_a 9000
1739 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})"
1740 check_pmtu_value "9000" "${pmtu}" "increasing tunnel MTU" || fail=1
1745 test_pmtu_vti4_udp_routed_exception() {
1746 setup namespaces routing vti4routed xfrm4udprouted || return $ksft_skip
1747 trace "${ns_a}" veth_A-R1 "${ns_b}" veth_B-R1 \
1748 "${ns_a}" vti4_a "${ns_b}" vti4_b
1751 vti_mtu=$((veth_mtu - 20))
1753 # UDP SPI SN IV ICV pad length next header
1754 esp_payload_rfc4106=$((vti_mtu - 8 - 4 - 4 - 8 - 16 - 1 - 1))
1755 ping_payload=$((esp_payload_rfc4106 - 28))
1757 mtu "${ns_a}" veth_A-R1 ${veth_mtu}
1758 mtu "${ns_r1}" veth_R1-A ${veth_mtu}
1759 mtu "${ns_b}" veth_B-R1 ${veth_mtu}
1760 mtu "${ns_r1}" veth_R1-B ${veth_mtu}
1762 mtu "${ns_a}" vti4_a ${vti_mtu}
1763 mtu "${ns_b}" vti4_b ${vti_mtu}
1765 # Send DF packet without exceeding link layer MTU, check that no
1766 # exception is created
1767 run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s ${ping_payload} ${tunnel4_b_addr}
1768 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel4_b_addr})"
1769 check_pmtu_value "" "${pmtu}" "sending packet smaller than PMTU (IP payload length ${esp_payload_rfc4106})" || return 1
1771 # Now decrease link layer MTU by 8 bytes on R1, check that exception is created
1772 # with the right PMTU value
1773 mtu "${ns_r1}" veth_R1-B $((veth_mtu - 8))
1774 run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s $((ping_payload)) ${tunnel4_b_addr}
1775 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel4_b_addr})"
1776 check_pmtu_value "$((esp_payload_rfc4106 - 8))" "${pmtu}" "exceeding PMTU (IP payload length $((esp_payload_rfc4106)))"
1779 test_pmtu_vti6_udp_routed_exception() {
1780 setup namespaces routing vti6routed xfrm6udprouted || return $ksft_skip
1781 trace "${ns_a}" veth_A-R1 "${ns_b}" veth_B-R1 \
1782 "${ns_a}" vti6_a "${ns_b}" vti6_b
1785 vti_mtu=$((veth_mtu - 40))
1787 # UDP SPI SN IV ICV pad length next header
1788 esp_payload_rfc4106=$((vti_mtu - 8 - 4 - 4 - 8 - 16 - 1 - 1))
1789 ping_payload=$((esp_payload_rfc4106 - 48))
1791 mtu "${ns_a}" veth_A-R1 ${veth_mtu}
1792 mtu "${ns_r1}" veth_R1-A ${veth_mtu}
1793 mtu "${ns_b}" veth_B-R1 ${veth_mtu}
1794 mtu "${ns_r1}" veth_R1-B ${veth_mtu}
1796 # mtu "${ns_a}" vti6_a ${vti_mtu}
1797 # mtu "${ns_b}" vti6_b ${vti_mtu}
1799 run_cmd ${ns_a} ${ping6} -q -M want -i 0.1 -w 1 -s ${ping_payload} ${tunnel6_b_addr}
1801 # Check that exception was not created
1802 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})"
1803 check_pmtu_value "" "${pmtu}" "sending packet smaller than PMTU (IP payload length ${esp_payload_rfc4106})" || return 1
1805 # Now decrease link layer MTU by 8 bytes on R1, check that exception is created
1806 # with the right PMTU value
1807 mtu "${ns_r1}" veth_R1-B $((veth_mtu - 8))
1808 run_cmd ${ns_a} ${ping6} -q -M want -i 0.1 -w 1 -s $((ping_payload)) ${tunnel6_b_addr}
1809 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})"
1810 check_pmtu_value "$((esp_payload_rfc4106 - 8))" "${pmtu}" "exceeding PMTU (IP payload length $((esp_payload_rfc4106)))"
1814 test_pmtu_vti4_default_mtu() {
1815 setup namespaces veth vti4 || return $ksft_skip
1817 # Check that MTU of vti device is MTU of veth minus IPv4 header length
1818 veth_mtu="$(link_get_mtu "${ns_a}" veth_a)"
1819 vti4_mtu="$(link_get_mtu "${ns_a}" vti4_a)"
1820 if [ $((veth_mtu - vti4_mtu)) -ne 20 ]; then
1821 err " vti MTU ${vti4_mtu} is not veth MTU ${veth_mtu} minus IPv4 header length"
1826 test_pmtu_vti6_default_mtu() {
1827 setup namespaces veth vti6 || return $ksft_skip
1829 # Check that MTU of vti device is MTU of veth minus IPv6 header length
1830 veth_mtu="$(link_get_mtu "${ns_a}" veth_a)"
1831 vti6_mtu="$(link_get_mtu "${ns_a}" vti6_a)"
1832 if [ $((veth_mtu - vti6_mtu)) -ne 40 ]; then
1833 err " vti MTU ${vti6_mtu} is not veth MTU ${veth_mtu} minus IPv6 header length"
1838 test_pmtu_vti4_link_add_mtu() {
1839 setup namespaces || return $ksft_skip
1841 run_cmd ${ns_a} ip link add vti4_a type vti local ${veth4_a_addr} remote ${veth4_b_addr} key 10
1842 [ $? -ne 0 ] && err " vti not supported" && return $ksft_skip
1843 run_cmd ${ns_a} ip link del vti4_a
1849 # Check invalid values first
1850 for v in $((min - 1)) $((max + 1)); do
1851 run_cmd ${ns_a} ip link add vti4_a mtu ${v} type vti local ${veth4_a_addr} remote ${veth4_b_addr} key 10
1852 # This can fail, or MTU can be adjusted to a proper value
1853 [ $? -ne 0 ] && continue
1854 mtu="$(link_get_mtu "${ns_a}" vti4_a)"
1855 if [ ${mtu} -lt ${min} -o ${mtu} -gt ${max} ]; then
1856 err " vti tunnel created with invalid MTU ${mtu}"
1859 run_cmd ${ns_a} ip link del vti4_a
1862 # Now check valid values
1863 for v in ${min} 1300 ${max}; do
1864 run_cmd ${ns_a} ip link add vti4_a mtu ${v} type vti local ${veth4_a_addr} remote ${veth4_b_addr} key 10
1865 mtu="$(link_get_mtu "${ns_a}" vti4_a)"
1866 run_cmd ${ns_a} ip link del vti4_a
1867 if [ "${mtu}" != "${v}" ]; then
1868 err " vti MTU ${mtu} doesn't match configured value ${v}"
1876 test_pmtu_vti6_link_add_mtu() {
1877 setup namespaces || return $ksft_skip
1879 run_cmd ${ns_a} ip link add vti6_a type vti6 local ${veth6_a_addr} remote ${veth6_b_addr} key 10
1880 [ $? -ne 0 ] && err " vti6 not supported" && return $ksft_skip
1881 run_cmd ${ns_a} ip link del vti6_a
1885 min=68 # vti6 can carry IPv4 packets too
1887 # Check invalid values first
1888 for v in $((min - 1)) $((max + 1)); do
1889 run_cmd ${ns_a} ip link add vti6_a mtu ${v} type vti6 local ${veth6_a_addr} remote ${veth6_b_addr} key 10
1890 # This can fail, or MTU can be adjusted to a proper value
1891 [ $? -ne 0 ] && continue
1892 mtu="$(link_get_mtu "${ns_a}" vti6_a)"
1893 if [ ${mtu} -lt ${min} -o ${mtu} -gt ${max} ]; then
1894 err " vti6 tunnel created with invalid MTU ${v}"
1897 run_cmd ${ns_a} ip link del vti6_a
1900 # Now check valid values
1901 for v in 68 1280 1300 $((65535 - 40)); do
1902 run_cmd ${ns_a} ip link add vti6_a mtu ${v} type vti6 local ${veth6_a_addr} remote ${veth6_b_addr} key 10
1903 mtu="$(link_get_mtu "${ns_a}" vti6_a)"
1904 run_cmd ${ns_a} ip link del vti6_a
1905 if [ "${mtu}" != "${v}" ]; then
1906 err " vti6 MTU ${mtu} doesn't match configured value ${v}"
1914 test_pmtu_vti6_link_change_mtu() {
1915 setup namespaces || return $ksft_skip
1917 run_cmd ${ns_a} ip link add dummy0 mtu 1500 type dummy
1918 [ $? -ne 0 ] && err " dummy not supported" && return $ksft_skip
1919 run_cmd ${ns_a} ip link add dummy1 mtu 3000 type dummy
1920 run_cmd ${ns_a} ip link set dummy0 up
1921 run_cmd ${ns_a} ip link set dummy1 up
1923 run_cmd ${ns_a} ip addr add ${dummy6_0_prefix}1/${dummy6_mask} dev dummy0
1924 run_cmd ${ns_a} ip addr add ${dummy6_1_prefix}1/${dummy6_mask} dev dummy1
1928 # Create vti6 interface bound to device, passing MTU, check it
1929 run_cmd ${ns_a} ip link add vti6_a mtu 1300 type vti6 remote ${dummy6_0_prefix}2 local ${dummy6_0_prefix}1
1930 mtu="$(link_get_mtu "${ns_a}" vti6_a)"
1931 if [ ${mtu} -ne 1300 ]; then
1932 err " vti6 MTU ${mtu} doesn't match configured value 1300"
1936 # Move to another device with different MTU, without passing MTU, check
1938 run_cmd ${ns_a} ip link set vti6_a type vti6 remote ${dummy6_1_prefix}2 local ${dummy6_1_prefix}1
1939 mtu="$(link_get_mtu "${ns_a}" vti6_a)"
1940 if [ ${mtu} -ne $((3000 - 40)) ]; then
1941 err " vti MTU ${mtu} is not dummy MTU 3000 minus IPv6 header length"
1945 # Move it back, passing MTU, check MTU is not overridden
1946 run_cmd ${ns_a} ip link set vti6_a mtu 1280 type vti6 remote ${dummy6_0_prefix}2 local ${dummy6_0_prefix}1
1947 mtu="$(link_get_mtu "${ns_a}" vti6_a)"
1948 if [ ${mtu} -ne 1280 ]; then
1949 err " vti6 MTU ${mtu} doesn't match configured value 1280"
1959 if ! which ${cmd} > /dev/null 2>&1; then
1960 err " missing required command: '${cmd}'"
1966 test_cleanup_vxlanX_exception() {
1971 check_command taskset || return $ksft_skip
1972 cpu_list=$(grep -m 2 processor /proc/cpuinfo | cut -d ' ' -f 2)
1974 setup namespaces routing ${encap}${outer} || return $ksft_skip
1975 trace "${ns_a}" ${encap}_a "${ns_b}" ${encap}_b \
1976 "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \
1977 "${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B
1979 # Create route exception by exceeding link layer MTU
1980 mtu "${ns_a}" veth_A-R1 $((${ll_mtu} + 1000))
1981 mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000))
1982 mtu "${ns_b}" veth_B-R1 ${ll_mtu}
1983 mtu "${ns_r1}" veth_R1-B ${ll_mtu}
1985 mtu "${ns_a}" ${encap}_a $((${ll_mtu} + 1000))
1986 mtu "${ns_b}" ${encap}_b $((${ll_mtu} + 1000))
1988 # Fill exception cache for multiple CPUs (2)
1989 # we can always use inner IPv4 for that
1990 for cpu in ${cpu_list}; do
1991 run_cmd taskset --cpu-list ${cpu} ${ns_a} ping -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${tunnel4_b_addr}
1994 ${ns_a} ip link del dev veth_A-R1 &
1997 if [ "$(cat /proc/${iplink_pid}/cmdline 2>/dev/null | tr -d '\0')" = "iplinkdeldevveth_A-R1" ]; then
1998 err " can't delete veth device in a timely manner, PMTU dst likely leaked"
2003 test_cleanup_ipv6_exception() {
2004 test_cleanup_vxlanX_exception 6
2007 test_cleanup_ipv4_exception() {
2008 test_cleanup_vxlanX_exception 4
2018 # Since cleanup() relies on variables modified by this subshell, it
2019 # has to run in this context.
2022 if [ "$VERBOSE" = "1" ]; then
2023 printf "\n##########################################################################\n\n"
2029 if [ $ret -eq 0 ]; then
2030 printf "TEST: %-60s [ OK ]\n" "${tdesc}"
2031 elif [ $ret -eq 1 ]; then
2032 printf "TEST: %-60s [FAIL]\n" "${tdesc}"
2033 if [ "${PAUSE_ON_FAIL}" = "yes" ]; then
2035 echo "Pausing. Hit enter to continue"
2040 elif [ $ret -eq $ksft_skip ]; then
2041 printf "TEST: %-60s [SKIP]\n" "${tdesc}"
2051 [ $exitcode=$ksft_skip ] && exitcode=0
2054 [ $all_skipped = true ] && exitcode=$ksft_skip
2070 run_test "${tname}" "${tdesc} - nexthop objects"
2074 test_list_flush_ipv4_exception() {
2075 setup namespaces routing || return $ksft_skip
2076 trace "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \
2077 "${ns_r1}" veth_R1-B "${ns_b}" veth_B-R1 \
2078 "${ns_a}" veth_A-R2 "${ns_r2}" veth_R2-A \
2079 "${ns_r2}" veth_R2-B "${ns_b}" veth_B-R2
2081 dst_prefix1="${prefix4}.${b_r1}."
2082 dst2="${prefix4}.${b_r2}.1"
2084 # Set up initial MTU values
2085 mtu "${ns_a}" veth_A-R1 2000
2086 mtu "${ns_r1}" veth_R1-A 2000
2087 mtu "${ns_r1}" veth_R1-B 1500
2088 mtu "${ns_b}" veth_B-R1 1500
2090 mtu "${ns_a}" veth_A-R2 2000
2091 mtu "${ns_r2}" veth_R2-A 2000
2092 mtu "${ns_r2}" veth_R2-B 1500
2093 mtu "${ns_b}" veth_B-R2 1500
2097 # Add 100 addresses for veth endpoint on B reached by default A route
2098 for i in $(seq 100 199); do
2099 run_cmd ${ns_b} ip addr add "${dst_prefix1}${i}" dev veth_B-R1
2102 # Create 100 cached route exceptions for path via R1, one via R2. Note
2103 # that with IPv4 we need to actually cause a route lookup that matches
2104 # the exception caused by ICMP, in order to actually have a cached
2105 # route, so we need to ping each destination twice
2106 for i in $(seq 100 199); do
2107 run_cmd ${ns_a} ping -q -M want -i 0.1 -c 2 -s 1800 "${dst_prefix1}${i}"
2109 run_cmd ${ns_a} ping -q -M want -i 0.1 -c 2 -s 1800 "${dst2}"
2111 if [ "$(${ns_a} ip -oneline route list cache | wc -l)" -ne 101 ]; then
2112 err " can't list cached exceptions"
2116 run_cmd ${ns_a} ip route flush cache
2117 pmtu1="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst_prefix}1)"
2118 pmtu2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst_prefix}2)"
2119 if [ -n "${pmtu1}" ] || [ -n "${pmtu2}" ] || \
2120 [ -n "$(${ns_a} ip route list cache)" ]; then
2121 err " can't flush cached exceptions"
2128 test_list_flush_ipv6_exception() {
2129 setup namespaces routing || return $ksft_skip
2130 trace "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \
2131 "${ns_r1}" veth_R1-B "${ns_b}" veth_B-R1 \
2132 "${ns_a}" veth_A-R2 "${ns_r2}" veth_R2-A \
2133 "${ns_r2}" veth_R2-B "${ns_b}" veth_B-R2
2135 dst_prefix1="${prefix6}:${b_r1}::"
2136 dst2="${prefix6}:${b_r2}::1"
2138 # Set up initial MTU values
2139 mtu "${ns_a}" veth_A-R1 2000
2140 mtu "${ns_r1}" veth_R1-A 2000
2141 mtu "${ns_r1}" veth_R1-B 1500
2142 mtu "${ns_b}" veth_B-R1 1500
2144 mtu "${ns_a}" veth_A-R2 2000
2145 mtu "${ns_r2}" veth_R2-A 2000
2146 mtu "${ns_r2}" veth_R2-B 1500
2147 mtu "${ns_b}" veth_B-R2 1500
2151 # Add 100 addresses for veth endpoint on B reached by default A route
2152 for i in $(seq 100 199); do
2153 run_cmd ${ns_b} ip addr add "${dst_prefix1}${i}" dev veth_B-R1
2156 # Create 100 cached route exceptions for path via R1, one via R2
2157 for i in $(seq 100 199); do
2158 run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s 1800 "${dst_prefix1}${i}"
2160 run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s 1800 "${dst2}"
2161 if [ "$(${ns_a} ip -oneline -6 route list cache | wc -l)" -ne 101 ]; then
2162 err " can't list cached exceptions"
2166 run_cmd ${ns_a} ip -6 route flush cache
2167 pmtu1="$(route_get_dst_pmtu_from_exception "${ns_a}" "${dst_prefix1}100")"
2168 pmtu2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})"
2169 if [ -n "${pmtu1}" ] || [ -n "${pmtu2}" ] || \
2170 [ -n "$(${ns_a} ip -6 route list cache)" ]; then
2171 err " can't flush cached exceptions"
2178 test_pmtu_ipvX_route_change() {
2181 setup namespaces routing || return 2
2182 trace "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \
2183 "${ns_r1}" veth_R1-B "${ns_b}" veth_B-R1 \
2184 "${ns_a}" veth_A-R2 "${ns_r2}" veth_R2-A \
2185 "${ns_r2}" veth_R2-B "${ns_b}" veth_B-R2
2187 if [ ${family} -eq 4 ]; then
2189 dst1="${prefix4}.${b_r1}.1"
2190 dst2="${prefix4}.${b_r2}.1"
2191 gw="${prefix4}.${a_r1}.2"
2194 dst1="${prefix6}:${b_r1}::1"
2195 dst2="${prefix6}:${b_r2}::1"
2196 gw="${prefix6}:${a_r1}::2"
2199 # Set up initial MTU values
2200 mtu "${ns_a}" veth_A-R1 2000
2201 mtu "${ns_r1}" veth_R1-A 2000
2202 mtu "${ns_r1}" veth_R1-B 1400
2203 mtu "${ns_b}" veth_B-R1 1400
2205 mtu "${ns_a}" veth_A-R2 2000
2206 mtu "${ns_r2}" veth_R2-A 2000
2207 mtu "${ns_r2}" veth_R2-B 1500
2208 mtu "${ns_b}" veth_B-R2 1500
2210 # Create route exceptions
2211 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1800 ${dst1}
2212 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1800 ${dst2}
2214 # Check that exceptions have been created with the correct PMTU
2215 pmtu_1="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst1})"
2216 check_pmtu_value "1400" "${pmtu_1}" "exceeding MTU" || return 1
2217 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})"
2218 check_pmtu_value "1500" "${pmtu_2}" "exceeding MTU" || return 1
2220 # Replace the route from A to R1
2221 run_cmd ${ns_a} ip route change default via ${gw}
2223 # Delete the device in A
2224 run_cmd ${ns_a} ip link del "veth_A-R1"
2227 test_pmtu_ipv4_route_change() {
2228 test_pmtu_ipvX_route_change 4
2231 test_pmtu_ipv6_route_change() {
2232 test_pmtu_ipvX_route_change 6
2237 echo "$0 [OPTIONS] [TEST]..."
2238 echo "If no TEST argument is given, all tests will be run."
2241 echo " --trace: capture traffic to TEST_INTERFACE.pcap"
2243 echo "Available tests${tests}"
2247 ################################################################################
2253 while getopts :ptv o
2256 p) PAUSE_ON_FAIL=yes;;
2258 t) if which tcpdump > /dev/null 2>&1; then
2261 echo "=== tcpdump not available, tracing disabled"
2267 shift $(($OPTIND-1))
2273 # Check first that all requested tests are available before running any
2274 command -v > /dev/null "test_${arg}" || { echo "=== Test ${arg} not found"; usage; }
2283 ip nexthop ls >/dev/null 2>&1
2284 [ $? -eq 0 ] && HAVE_NH=yes
2289 for t in ${tests}; do
2290 [ "${name}" = "" ] && name="${t}" && continue
2291 [ "${desc}" = "" ] && desc="${t}" && continue
2293 if [ "${HAVE_NH}" = "yes" ]; then
2299 [ "${arg}" != "${arg#--*}" ] && continue
2300 [ "${arg}" = "${name}" ] && run_this=1 && break
2303 if [ $run_this -eq 1 ]; then
2304 run_test "${name}" "${desc}"
2305 # if test was skipped no need to retry with nexthop objects
2306 [ $? -eq $ksft_skip ] && rerun_nh=0
2308 if [ "${rerun_nh}" = "1" ]; then
2309 run_test_nh "${name}" "${desc}"