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::"
366 err_buf="${err_buf}${1}
378 if [ "$VERBOSE" = "1" ]; then
379 printf " COMMAND: $cmd\n"
384 if [ "$VERBOSE" = "1" -a -n "$out" ]; then
395 if [ "$VERBOSE" = "1" ]; then
396 printf " COMMAND: %s &\n" "${cmd}"
402 # Find the auto-generated name for this namespace
412 if [ "${outer}" = "4" ]; then
413 modprobe fou || return $ksft_skip
414 a_addr="${prefix4}.${a_r1}.1"
415 b_addr="${prefix4}.${b_r1}.1"
416 if [ "${inner}" = "4" ]; then
424 modprobe fou6 || return $ksft_skip
425 a_addr="${prefix6}:${a_r1}::1"
426 b_addr="${prefix6}:${b_r1}::1"
427 if [ "${inner}" = "4" ]; then
438 run_cmd ${ns_a} ip fou add port 5555 ipproto ${ipproto} || return $ksft_skip
439 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
441 run_cmd ${ns_b} ip fou add port 5556 ipproto ${ipproto}
442 run_cmd ${ns_b} ip link add ${encap}_b type ${type} ${mode} local ${b_addr} remote ${a_addr} encap ${encap} encap-sport auto encap-dport 5555
444 if [ "${inner}" = "4" ]; then
445 run_cmd ${ns_a} ip addr add ${tunnel4_a_addr}/${tunnel4_mask} dev ${encap}_a
446 run_cmd ${ns_b} ip addr add ${tunnel4_b_addr}/${tunnel4_mask} dev ${encap}_b
448 run_cmd ${ns_a} ip addr add ${tunnel6_a_addr}/${tunnel6_mask} dev ${encap}_a
449 run_cmd ${ns_b} ip addr add ${tunnel6_b_addr}/${tunnel6_mask} dev ${encap}_b
452 run_cmd ${ns_a} ip link set ${encap}_a up
453 run_cmd ${ns_b} ip link set ${encap}_b up
457 setup_fou_or_gue 4 4 fou
461 setup_fou_or_gue 4 6 fou
465 setup_fou_or_gue 6 4 fou
469 setup_fou_or_gue 6 6 fou
473 setup_fou_or_gue 4 4 gue
477 setup_fou_or_gue 4 6 gue
481 setup_fou_or_gue 6 4 gue
485 setup_fou_or_gue 6 6 gue
488 setup_ipvX_over_ipvY() {
492 if [ "${outer}" -eq 4 ]; then
493 a_addr="${prefix4}.${a_r1}.1"
494 b_addr="${prefix4}.${b_r1}.1"
495 if [ "${inner}" -eq 4 ]; then
503 a_addr="${prefix6}:${a_r1}::1"
504 b_addr="${prefix6}:${b_r1}::1"
506 if [ "${inner}" -eq 4 ]; then
513 run_cmd ${ns_a} ip link add ip_a type ${type} local ${a_addr} remote ${b_addr} mode ${mode} || return $ksft_skip
514 run_cmd ${ns_b} ip link add ip_b type ${type} local ${b_addr} remote ${a_addr} mode ${mode}
516 run_cmd ${ns_a} ip link set ip_a up
517 run_cmd ${ns_b} ip link set ip_b up
519 if [ "${inner}" = "4" ]; then
520 run_cmd ${ns_a} ip addr add ${tunnel4_a_addr}/${tunnel4_mask} dev ip_a
521 run_cmd ${ns_b} ip addr add ${tunnel4_b_addr}/${tunnel4_mask} dev ip_b
523 run_cmd ${ns_a} ip addr add ${tunnel6_a_addr}/${tunnel6_mask} dev ip_a
524 run_cmd ${ns_b} ip addr add ${tunnel6_b_addr}/${tunnel6_mask} dev ip_b
529 setup_ipvX_over_ipvY 4 4
533 setup_ipvX_over_ipvY 6 4
537 setup_ipvX_over_ipvY 4 6
541 setup_ipvX_over_ipvY 6 6
545 for n in ${NS_A} ${NS_B} ${NS_C} ${NS_R1} ${NS_R2}; do
546 ip netns add ${n} || return 1
548 # Disable DAD, so that we don't have to wait to use the
549 # configured IPv6 addresses
550 ip netns exec ${n} sysctl -q net/ipv6/conf/default/accept_dad=0
555 run_cmd ${ns_a} ip link add veth_a type veth peer name veth_b || return 1
556 run_cmd ${ns_a} ip link set veth_b netns ${NS_B}
558 run_cmd ${ns_a} ip addr add ${veth4_a_addr}/${veth4_mask} dev veth_a
559 run_cmd ${ns_b} ip addr add ${veth4_b_addr}/${veth4_mask} dev veth_b
561 run_cmd ${ns_a} ip addr add ${veth6_a_addr}/${veth6_mask} dev veth_a
562 run_cmd ${ns_b} ip addr add ${veth6_b_addr}/${veth6_mask} dev veth_b
564 run_cmd ${ns_a} ip link set veth_a up
565 run_cmd ${ns_b} ip link set veth_b up
576 [ ${proto} -eq 6 ] && vti_type="vti6" || vti_type="vti"
578 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
579 run_cmd ${ns_b} ip link add vti${proto}_b type ${vti_type} local ${veth_b_addr} remote ${veth_a_addr} key 10
581 run_cmd ${ns_a} ip addr add ${vti_a_addr}/${vti_mask} dev vti${proto}_a
582 run_cmd ${ns_b} ip addr add ${vti_b_addr}/${vti_mask} dev vti${proto}_b
584 run_cmd ${ns_a} ip link set vti${proto}_a up
585 run_cmd ${ns_b} ip link set vti${proto}_b up
589 setup_vti 4 ${veth4_a_addr} ${veth4_b_addr} ${tunnel4_a_addr} ${tunnel4_b_addr} ${tunnel4_mask}
593 setup_vti 6 ${veth6_a_addr} ${veth6_b_addr} ${tunnel6_a_addr} ${tunnel6_b_addr} ${tunnel6_mask}
597 setup_vti 4 ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1 ${tunnel4_a_addr} ${tunnel4_b_addr} ${tunnel4_mask}
601 setup_vti 6 ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 ${tunnel6_a_addr} ${tunnel6_b_addr} ${tunnel6_mask}
604 setup_vxlan_or_geneve() {
611 if [ "${type}" = "vxlan" ]; then
612 opts="${opts} ttl 64 dstport 4789"
613 opts_a="local ${a_addr}"
614 opts_b="local ${b_addr}"
620 run_cmd ${ns_a} ip link add ${type}_a type ${type} id 1 ${opts_a} remote ${b_addr} ${opts} || return 1
621 run_cmd ${ns_b} ip link add ${type}_b type ${type} id 1 ${opts_b} remote ${a_addr} ${opts}
623 if [ -n "${br_if_a}" ]; then
624 run_cmd ${ns_a} ip addr add ${tunnel4_a_addr}/${tunnel4_mask} dev ${br_if_a}
625 run_cmd ${ns_a} ip addr add ${tunnel6_a_addr}/${tunnel6_mask} dev ${br_if_a}
626 run_cmd ${ns_a} ip link set ${type}_a master ${br_if_a}
628 run_cmd ${ns_a} ip addr add ${tunnel4_a_addr}/${tunnel4_mask} dev ${type}_a
629 run_cmd ${ns_a} ip addr add ${tunnel6_a_addr}/${tunnel6_mask} dev ${type}_a
632 run_cmd ${ns_b} ip addr add ${tunnel4_b_addr}/${tunnel4_mask} dev ${type}_b
633 run_cmd ${ns_b} ip addr add ${tunnel6_b_addr}/${tunnel6_mask} dev ${type}_b
635 run_cmd ${ns_a} ip link set ${type}_a up
636 run_cmd ${ns_b} ip link set ${type}_b up
640 setup_vxlan_or_geneve geneve ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1 "df set"
644 setup_vxlan_or_geneve vxlan ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1 "df set"
648 setup_vxlan_or_geneve geneve ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 ""
652 setup_vxlan_or_geneve vxlan ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 ""
655 setup_bridged_geneve4() {
656 setup_vxlan_or_geneve geneve ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1 "df set" "br0"
659 setup_bridged_vxlan4() {
660 setup_vxlan_or_geneve vxlan ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1 "df set" "br0"
663 setup_bridged_geneve6() {
664 setup_vxlan_or_geneve geneve ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 "" "br0"
667 setup_bridged_vxlan6() {
668 setup_vxlan_or_geneve vxlan ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 "" "br0"
677 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
678 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}
679 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
680 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
682 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}
683 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}
684 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
685 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
688 setup_nettest_xfrm() {
689 if ! which nettest >/dev/null; then
691 if ! which nettest >/dev/null; then
692 echo "'nettest' command not found; skipping tests"
697 [ ${1} -eq 6 ] && proto="-6" || proto=""
700 run_cmd_bg "${ns_a}" nettest "${proto}" -q -D -s -x -p "${port}" -t 5
701 nettest_pids="${nettest_pids} $!"
703 run_cmd_bg "${ns_b}" nettest "${proto}" -q -D -s -x -p "${port}" -t 5
704 nettest_pids="${nettest_pids} $!"
708 setup_xfrm 4 ${veth4_a_addr} ${veth4_b_addr}
712 setup_xfrm 6 ${veth6_a_addr} ${veth6_b_addr}
716 setup_xfrm 4 ${veth4_a_addr} ${veth4_b_addr} "encap espinudp 4500 4500 0.0.0.0"
717 setup_nettest_xfrm 4 4500
721 setup_xfrm 6 ${veth6_a_addr} ${veth6_b_addr} "encap espinudp 4500 4500 0.0.0.0"
722 setup_nettest_xfrm 6 4500
725 setup_xfrm4udprouted() {
726 setup_xfrm 4 ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1 "encap espinudp 4500 4500 0.0.0.0"
727 setup_nettest_xfrm 4 4500
730 setup_xfrm6udprouted() {
731 setup_xfrm 6 ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 "encap espinudp 4500 4500 0.0.0.0"
732 setup_nettest_xfrm 6 4500
735 setup_routing_old() {
736 for i in ${routes}; do
737 [ "${ns}" = "" ] && ns="${i}" && continue
738 [ "${addr}" = "" ] && addr="${i}" && continue
739 [ "${gw}" = "" ] && gw="${i}"
741 ns_name="$(nsname ${ns})"
743 ip -n "${ns_name}" route add "${addr}" table "${rt_table}" via "${gw}"
745 ns=""; addr=""; gw=""
749 setup_routing_new() {
750 for i in ${nexthops}; do
751 [ "${ns}" = "" ] && ns="${i}" && continue
752 [ "${fam}" = "" ] && fam="${i}" && continue
753 [ "${nhid}" = "" ] && nhid="${i}" && continue
754 [ "${gw}" = "" ] && gw="${i}" && continue
755 [ "${dev}" = "" ] && dev="${i}"
757 ns_name="$(nsname ${ns})"
759 ip -n ${ns_name} -${fam} nexthop add id ${nhid} via ${gw} dev ${dev}
761 ns=""; fam=""; nhid=""; gw=""; dev=""
765 for i in ${routes_nh}; do
766 [ "${ns}" = "" ] && ns="${i}" && continue
767 [ "${fam}" = "" ] && fam="${i}" && continue
768 [ "${addr}" = "" ] && addr="${i}" && continue
769 [ "${nhid}" = "" ] && nhid="${i}"
771 ns_name="$(nsname ${ns})"
773 ip -n "${ns_name}" -"${fam}" route add "${addr}" table "${rt_table}" nhid "${nhid}"
775 ns=""; fam=""; addr=""; nhid=""
780 for i in ${NS_R1} ${NS_R2}; do
781 ip netns exec ${i} sysctl -q net/ipv4/ip_forward=1
782 ip netns exec ${i} sysctl -q net/ipv6/conf/all/forwarding=1
785 for i in ${routing_addrs}; do
786 [ "${ns}" = "" ] && ns="${i}" && continue
787 [ "${peer}" = "" ] && peer="${i}" && continue
788 [ "${segment}" = "" ] && segment="${i}"
790 ns_name="$(nsname ${ns})"
791 peer_name="$(nsname ${peer})"
792 if="veth_${ns}-${peer}"
793 ifpeer="veth_${peer}-${ns}"
796 ip link add ${if} up netns ${ns_name} type veth peer name ${ifpeer} netns ${peer_name} || return 1
797 ip -n ${peer_name} link set dev ${ifpeer} up
800 ip -n ${ns_name} addr add ${prefix4}.${segment}.1/24 dev ${if}
801 ip -n ${ns_name} addr add ${prefix6}:${segment}::1/64 dev ${if}
803 ip -n ${peer_name} addr add ${prefix4}.${segment}.2/24 dev ${ifpeer}
804 ip -n ${peer_name} addr add ${prefix6}:${segment}::2/64 dev ${ifpeer}
806 ns=""; peer=""; segment=""
809 if [ "$USE_NH" = "yes" ]; then
818 setup_policy_routing() {
821 ip -netns "${NS_A}" -4 rule add dsfield "${policy_mark}" \
824 # Set the IPv4 Don't Fragment bit with tc, since socat doesn't seem to
825 # have an option do to it.
826 tc -netns "${NS_A}" qdisc replace dev veth_A-R1 root prio
827 tc -netns "${NS_A}" qdisc replace dev veth_A-R2 root prio
828 tc -netns "${NS_A}" filter add dev veth_A-R1 \
829 protocol ipv4 flower ip_proto udp \
830 action pedit ex munge ip df set 0x40 pipe csum ip and udp
831 tc -netns "${NS_A}" filter add dev veth_A-R2 \
832 protocol ipv4 flower ip_proto udp \
833 action pedit ex munge ip df set 0x40 pipe csum ip and udp
837 run_cmd ${ns_a} ip link add br0 type bridge || return $ksft_skip
838 run_cmd ${ns_a} ip link set br0 up
840 run_cmd ${ns_c} ip link add veth_C-A type veth peer name veth_A-C
841 run_cmd ${ns_c} ip link set veth_A-C netns ns-A
843 run_cmd ${ns_a} ip link set veth_A-C up
844 run_cmd ${ns_c} ip link set veth_C-A up
845 run_cmd ${ns_c} ip addr add ${veth4_c_addr}/${veth4_mask} dev veth_C-A
846 run_cmd ${ns_c} ip addr add ${veth6_c_addr}/${veth6_mask} dev veth_C-A
847 run_cmd ${ns_a} ip link set veth_A-C master br0
850 setup_ovs_vxlan_or_geneve() {
855 if [ "${type}" = "vxlan" ]; then
856 opts="${opts} ttl 64 dstport 4789"
857 opts_b="local ${b_addr}"
860 run_cmd ovs-vsctl add-port ovs_br0 ${type}_a -- \
861 set interface ${type}_a type=${type} \
862 options:remote_ip=${b_addr} options:key=1 options:csum=true || return 1
864 run_cmd ${ns_b} ip link add ${type}_b type ${type} id 1 ${opts_b} remote ${a_addr} ${opts} || return 1
866 run_cmd ${ns_b} ip addr add ${tunnel4_b_addr}/${tunnel4_mask} dev ${type}_b
867 run_cmd ${ns_b} ip addr add ${tunnel6_b_addr}/${tunnel6_mask} dev ${type}_b
869 run_cmd ${ns_b} ip link set ${type}_b up
872 setup_ovs_geneve4() {
873 setup_ovs_vxlan_or_geneve geneve ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1
877 setup_ovs_vxlan_or_geneve vxlan ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1
880 setup_ovs_geneve6() {
881 setup_ovs_vxlan_or_geneve geneve ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1
885 setup_ovs_vxlan_or_geneve vxlan ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1
889 run_cmd ovs-vsctl add-br ovs_br0 || return $ksft_skip
890 run_cmd ip link set ovs_br0 up
892 run_cmd ${ns_c} ip link add veth_C-A type veth peer name veth_A-C
893 run_cmd ${ns_c} ip link set veth_A-C netns 1
895 run_cmd ip link set veth_A-C up
896 run_cmd ${ns_c} ip link set veth_C-A up
897 run_cmd ${ns_c} ip addr add ${veth4_c_addr}/${veth4_mask} dev veth_C-A
898 run_cmd ${ns_c} ip addr add ${veth6_c_addr}/${veth6_mask} dev veth_C-A
899 run_cmd ovs-vsctl add-port ovs_br0 veth_A-C
901 # Move veth_A-R1 to init
902 run_cmd ${ns_a} ip link set veth_A-R1 netns 1
903 run_cmd ip addr add ${prefix4}.${a_r1}.1/${veth4_mask} dev veth_A-R1
904 run_cmd ip addr add ${prefix6}:${a_r1}::1/${veth6_mask} dev veth_A-R1
905 run_cmd ip link set veth_A-R1 up
906 run_cmd ip route add ${prefix4}.${b_r1}.1 via ${prefix4}.${a_r1}.2
907 run_cmd ip route add ${prefix6}:${b_r1}::1 via ${prefix6}:${a_r1}::2
911 [ "$(id -u)" -ne 0 ] && echo " need to run as root" && return $ksft_skip
914 eval setup_${arg} || { echo " ${arg} not supported"; return 1; }
919 [ $TRACING -eq 0 ] && return
922 [ "${ns_cmd}" = "" ] && ns_cmd="${arg}" && continue
923 ${ns_cmd} tcpdump --immediate-mode -s 0 -i "${arg}" -w "${name}_${arg}.pcap" 2> /dev/null &
924 tcpdump_pids="${tcpdump_pids} $!"
931 for pid in ${tcpdump_pids}; do
936 for pid in ${nettest_pids}; do
941 for pid in ${socat_pids}; do
946 for n in ${NS_A} ${NS_B} ${NS_C} ${NS_R1} ${NS_R2}; do
947 ip netns del ${n} 2> /dev/null
950 ip link del veth_A-C 2>/dev/null
951 ip link del veth_A-R1 2>/dev/null
952 ovs-vsctl --if-exists del-port vxlan_a 2>/dev/null
953 ovs-vsctl --if-exists del-br ovs_br0 2>/dev/null
961 ${ns_cmd} ip link set dev ${dev} mtu ${mtu}
968 for i in ${input}; do
969 [ ${next} -eq 1 -a "${i}" = "lock" ] && next=2 && continue
970 [ ${next} -eq 1 ] && echo "${i}" && return
971 [ ${next} -eq 2 ] && echo "lock ${i}" && return
972 [ "${i}" = "mtu" ] && next=1
980 ${ns_cmd} ip link show dev "${name}"
987 mtu_parse "$(link_get "${ns_cmd}" ${name})"
990 route_get_dst_exception() {
995 if [ -z "${dsfield}" ]; then
999 ${ns_cmd} ip route get "${dst}" dsfield "${dsfield}"
1002 route_get_dst_pmtu_from_exception() {
1007 mtu_parse "$(route_get_dst_exception "${ns_cmd}" "${dst}" "${dsfield}")"
1010 check_pmtu_value() {
1015 [ "${expected}" = "any" ] && [ -n "${value}" ] && return 0
1016 [ "${value}" = "${expected}" ] && return 0
1017 [ -z "${value}" ] && err " PMTU exception wasn't created after ${event}" && return 1
1018 [ -z "${expected}" ] && err " PMTU exception shouldn't exist after ${event}" && return 1
1019 err " found PMTU exception with incorrect MTU ${value}, expected ${expected}, after ${event}"
1026 setup namespaces routing || return $ksft_skip
1027 trace "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \
1028 "${ns_r1}" veth_R1-B "${ns_b}" veth_B-R1 \
1029 "${ns_a}" veth_A-R2 "${ns_r2}" veth_R2-A \
1030 "${ns_r2}" veth_R2-B "${ns_b}" veth_B-R2
1032 if [ ${family} -eq 4 ]; then
1034 dst1="${prefix4}.${b_r1}.1"
1035 dst2="${prefix4}.${b_r2}.1"
1038 dst1="${prefix6}:${b_r1}::1"
1039 dst2="${prefix6}:${b_r2}::1"
1042 # Set up initial MTU values
1043 mtu "${ns_a}" veth_A-R1 2000
1044 mtu "${ns_r1}" veth_R1-A 2000
1045 mtu "${ns_r1}" veth_R1-B 1400
1046 mtu "${ns_b}" veth_B-R1 1400
1048 mtu "${ns_a}" veth_A-R2 2000
1049 mtu "${ns_r2}" veth_R2-A 2000
1050 mtu "${ns_r2}" veth_R2-B 1500
1051 mtu "${ns_b}" veth_B-R2 1500
1053 # Create route exceptions
1054 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1800 ${dst1}
1055 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1800 ${dst2}
1057 # Check that exceptions have been created with the correct PMTU
1058 pmtu_1="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst1})"
1059 check_pmtu_value "1400" "${pmtu_1}" "exceeding MTU" || return 1
1060 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})"
1061 check_pmtu_value "1500" "${pmtu_2}" "exceeding MTU" || return 1
1063 # Decrease local MTU below PMTU, check for PMTU decrease in route exception
1064 mtu "${ns_a}" veth_A-R1 1300
1065 mtu "${ns_r1}" veth_R1-A 1300
1066 pmtu_1="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst1})"
1067 check_pmtu_value "1300" "${pmtu_1}" "decreasing local MTU" || return 1
1068 # Second exception shouldn't be modified
1069 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})"
1070 check_pmtu_value "1500" "${pmtu_2}" "changing local MTU on a link not on this path" || return 1
1072 # Increase MTU, check for PMTU increase in route exception
1073 mtu "${ns_a}" veth_A-R1 1700
1074 mtu "${ns_r1}" veth_R1-A 1700
1075 pmtu_1="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst1})"
1076 check_pmtu_value "1700" "${pmtu_1}" "increasing local MTU" || return 1
1077 # Second exception shouldn't be modified
1078 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})"
1079 check_pmtu_value "1500" "${pmtu_2}" "changing local MTU on a link not on this path" || return 1
1081 # Skip PMTU locking tests for IPv6
1082 [ $family -eq 6 ] && return 0
1084 # Decrease remote MTU on path via R2, get new exception
1085 mtu "${ns_r2}" veth_R2-B 400
1086 mtu "${ns_b}" veth_B-R2 400
1087 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1400 ${dst2}
1088 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})"
1089 check_pmtu_value "lock 552" "${pmtu_2}" "exceeding MTU, with MTU < min_pmtu" || return 1
1091 # Decrease local MTU below PMTU
1092 mtu "${ns_a}" veth_A-R2 500
1093 mtu "${ns_r2}" veth_R2-A 500
1094 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})"
1095 check_pmtu_value "500" "${pmtu_2}" "decreasing local MTU" || return 1
1097 # Increase local MTU
1098 mtu "${ns_a}" veth_A-R2 1500
1099 mtu "${ns_r2}" veth_R2-A 1500
1100 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})"
1101 check_pmtu_value "1500" "${pmtu_2}" "increasing local MTU" || return 1
1104 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1400 ${dst2}
1105 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})"
1106 check_pmtu_value "lock 552" "${pmtu_2}" "exceeding MTU, with MTU < min_pmtu" || return 1
1109 test_pmtu_ipv4_exception() {
1113 test_pmtu_ipv6_exception() {
1117 test_pmtu_ipv4_dscp_icmp_exception() {
1120 setup namespaces policy_routing || return $ksft_skip
1121 trace "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \
1122 "${ns_r1}" veth_R1-B "${ns_b}" veth_B-R1 \
1123 "${ns_a}" veth_A-R2 "${ns_r2}" veth_R2-A \
1124 "${ns_r2}" veth_R2-B "${ns_b}" veth_B-R2
1126 # Set up initial MTU values
1127 mtu "${ns_a}" veth_A-R1 2000
1128 mtu "${ns_r1}" veth_R1-A 2000
1129 mtu "${ns_r1}" veth_R1-B 1400
1130 mtu "${ns_b}" veth_B-R1 1400
1132 mtu "${ns_a}" veth_A-R2 2000
1133 mtu "${ns_r2}" veth_R2-A 2000
1134 mtu "${ns_r2}" veth_R2-B 1500
1135 mtu "${ns_b}" veth_B-R2 1500
1137 len=$((2000 - 20 - 8)) # Fills MTU of veth_A-R1
1139 dst1="${prefix4}.${b_r1}.1"
1140 dst2="${prefix4}.${b_r2}.1"
1142 # Create route exceptions
1143 dsfield=${policy_mark} # No ECN bit set (Not-ECT)
1144 run_cmd "${ns_a}" ping -q -M want -Q "${dsfield}" -c 1 -w 1 -s "${len}" "${dst1}"
1146 dsfield=$(printf "%#x" $((policy_mark + 0x02))) # ECN=2 (ECT(0))
1147 run_cmd "${ns_a}" ping -q -M want -Q "${dsfield}" -c 1 -w 1 -s "${len}" "${dst2}"
1149 # Check that exceptions have been created with the correct PMTU
1150 pmtu_1="$(route_get_dst_pmtu_from_exception "${ns_a}" "${dst1}" "${policy_mark}")"
1151 check_pmtu_value "1400" "${pmtu_1}" "exceeding MTU" || return 1
1153 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" "${dst2}" "${policy_mark}")"
1154 check_pmtu_value "1500" "${pmtu_2}" "exceeding MTU" || return 1
1157 test_pmtu_ipv4_dscp_udp_exception() {
1160 if ! which socat > /dev/null 2>&1; then
1161 echo "'socat' command not found; skipping tests"
1165 setup namespaces policy_routing || return $ksft_skip
1166 trace "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \
1167 "${ns_r1}" veth_R1-B "${ns_b}" veth_B-R1 \
1168 "${ns_a}" veth_A-R2 "${ns_r2}" veth_R2-A \
1169 "${ns_r2}" veth_R2-B "${ns_b}" veth_B-R2
1171 # Set up initial MTU values
1172 mtu "${ns_a}" veth_A-R1 2000
1173 mtu "${ns_r1}" veth_R1-A 2000
1174 mtu "${ns_r1}" veth_R1-B 1400
1175 mtu "${ns_b}" veth_B-R1 1400
1177 mtu "${ns_a}" veth_A-R2 2000
1178 mtu "${ns_r2}" veth_R2-A 2000
1179 mtu "${ns_r2}" veth_R2-B 1500
1180 mtu "${ns_b}" veth_B-R2 1500
1182 len=$((2000 - 20 - 8)) # Fills MTU of veth_A-R1
1184 dst1="${prefix4}.${b_r1}.1"
1185 dst2="${prefix4}.${b_r2}.1"
1187 # Create route exceptions
1188 run_cmd_bg "${ns_b}" socat UDP-LISTEN:50000 OPEN:/dev/null,wronly=1
1189 socat_pids="${socat_pids} $!"
1191 dsfield=${policy_mark} # No ECN bit set (Not-ECT)
1192 run_cmd "${ns_a}" socat OPEN:/dev/zero,rdonly=1,readbytes="${len}" \
1193 UDP:"${dst1}":50000,tos="${dsfield}"
1195 dsfield=$(printf "%#x" $((policy_mark + 0x02))) # ECN=2 (ECT(0))
1196 run_cmd "${ns_a}" socat OPEN:/dev/zero,rdonly=1,readbytes="${len}" \
1197 UDP:"${dst2}":50000,tos="${dsfield}"
1199 # Check that exceptions have been created with the correct PMTU
1200 pmtu_1="$(route_get_dst_pmtu_from_exception "${ns_a}" "${dst1}" "${policy_mark}")"
1201 check_pmtu_value "1400" "${pmtu_1}" "exceeding MTU" || return 1
1202 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" "${dst2}" "${policy_mark}")"
1203 check_pmtu_value "1500" "${pmtu_2}" "exceeding MTU" || return 1
1206 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception() {
1212 if [ ${outer_family} -eq 4 ]; then
1213 setup namespaces routing ${type}4 || return $ksft_skip
1214 # IPv4 header UDP header VXLAN/GENEVE header Ethernet header
1215 exp_mtu=$((${ll_mtu} - 20 - 8 - 8 - 14))
1217 setup namespaces routing ${type}6 || return $ksft_skip
1218 # IPv6 header UDP header VXLAN/GENEVE header Ethernet header
1219 exp_mtu=$((${ll_mtu} - 40 - 8 - 8 - 14))
1222 trace "${ns_a}" ${type}_a "${ns_b}" ${type}_b \
1223 "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \
1224 "${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B
1226 if [ ${family} -eq 4 ]; then
1228 dst=${tunnel4_b_addr}
1231 dst=${tunnel6_b_addr}
1234 # Create route exception by exceeding link layer MTU
1235 mtu "${ns_a}" veth_A-R1 $((${ll_mtu} + 1000))
1236 mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000))
1237 mtu "${ns_b}" veth_B-R1 ${ll_mtu}
1238 mtu "${ns_r1}" veth_R1-B ${ll_mtu}
1240 mtu "${ns_a}" ${type}_a $((${ll_mtu} + 1000))
1241 mtu "${ns_b}" ${type}_b $((${ll_mtu} + 1000))
1242 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${dst}
1244 # Check that exception was created
1245 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst})"
1246 check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on ${type} interface"
1249 test_pmtu_ipv4_vxlan4_exception() {
1250 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception vxlan 4 4
1253 test_pmtu_ipv6_vxlan4_exception() {
1254 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception vxlan 6 4
1257 test_pmtu_ipv4_geneve4_exception() {
1258 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception geneve 4 4
1261 test_pmtu_ipv6_geneve4_exception() {
1262 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception geneve 6 4
1265 test_pmtu_ipv4_vxlan6_exception() {
1266 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception vxlan 4 6
1269 test_pmtu_ipv6_vxlan6_exception() {
1270 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception vxlan 6 6
1273 test_pmtu_ipv4_geneve6_exception() {
1274 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception geneve 4 6
1277 test_pmtu_ipv6_geneve6_exception() {
1278 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception geneve 6 6
1281 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception() {
1287 if [ ${outer_family} -eq 4 ]; then
1288 setup namespaces routing bridge bridged_${type}4 || return $ksft_skip
1289 # IPv4 header UDP header VXLAN/GENEVE header Ethernet header
1290 exp_mtu=$((${ll_mtu} - 20 - 8 - 8 - 14))
1292 setup namespaces routing bridge bridged_${type}6 || return $ksft_skip
1293 # IPv6 header UDP header VXLAN/GENEVE header Ethernet header
1294 exp_mtu=$((${ll_mtu} - 40 - 8 - 8 - 14))
1297 trace "${ns_a}" ${type}_a "${ns_b}" ${type}_b \
1298 "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \
1299 "${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B \
1300 "${ns_a}" br0 "${ns_a}" veth-A-C \
1303 if [ ${family} -eq 4 ]; then
1305 dst=${tunnel4_b_addr}
1308 dst=${tunnel6_b_addr}
1311 # Create route exception by exceeding link layer MTU
1312 mtu "${ns_a}" veth_A-R1 $((${ll_mtu} + 1000))
1313 mtu "${ns_a}" br0 $((${ll_mtu} + 1000))
1314 mtu "${ns_a}" veth_A-C $((${ll_mtu} + 1000))
1315 mtu "${ns_c}" veth_C-A $((${ll_mtu} + 1000))
1316 mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000))
1317 mtu "${ns_b}" veth_B-R1 ${ll_mtu}
1318 mtu "${ns_r1}" veth_R1-B ${ll_mtu}
1320 mtu "${ns_a}" ${type}_a $((${ll_mtu} + 1000))
1321 mtu "${ns_b}" ${type}_b $((${ll_mtu} + 1000))
1323 run_cmd ${ns_c} ${ping} -q -M want -i 0.1 -c 10 -s $((${ll_mtu} + 500)) ${dst} || return 1
1324 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${dst} || return 1
1326 # Check that exceptions were created
1327 pmtu="$(route_get_dst_pmtu_from_exception "${ns_c}" ${dst})"
1328 check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on bridged ${type} interface"
1329 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst})"
1330 check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on locally bridged ${type} interface"
1333 test_pmtu_ipv4_br_vxlan4_exception() {
1334 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception vxlan 4 4
1337 test_pmtu_ipv6_br_vxlan4_exception() {
1338 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception vxlan 6 4
1341 test_pmtu_ipv4_br_geneve4_exception() {
1342 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception geneve 4 4
1345 test_pmtu_ipv6_br_geneve4_exception() {
1346 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception geneve 6 4
1349 test_pmtu_ipv4_br_vxlan6_exception() {
1350 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception vxlan 4 6
1353 test_pmtu_ipv6_br_vxlan6_exception() {
1354 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception vxlan 6 6
1357 test_pmtu_ipv4_br_geneve6_exception() {
1358 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception geneve 4 6
1361 test_pmtu_ipv6_br_geneve6_exception() {
1362 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception geneve 6 6
1365 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception() {
1371 if [ ${outer_family} -eq 4 ]; then
1372 setup namespaces routing ovs_bridge ovs_${type}4 || return $ksft_skip
1373 # IPv4 header UDP header VXLAN/GENEVE header Ethernet header
1374 exp_mtu=$((${ll_mtu} - 20 - 8 - 8 - 14))
1376 setup namespaces routing ovs_bridge ovs_${type}6 || return $ksft_skip
1377 # IPv6 header UDP header VXLAN/GENEVE header Ethernet header
1378 exp_mtu=$((${ll_mtu} - 40 - 8 - 8 - 14))
1381 if [ "${type}" = "vxlan" ]; then
1382 tun_a="vxlan_sys_4789"
1383 elif [ "${type}" = "geneve" ]; then
1384 tun_a="genev_sys_6081"
1387 trace "" "${tun_a}" "${ns_b}" ${type}_b \
1388 "" veth_A-R1 "${ns_r1}" veth_R1-A \
1389 "${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B \
1390 "" ovs_br0 "" veth-A-C \
1393 if [ ${family} -eq 4 ]; then
1395 dst=${tunnel4_b_addr}
1398 dst=${tunnel6_b_addr}
1401 # Create route exception by exceeding link layer MTU
1402 mtu "" veth_A-R1 $((${ll_mtu} + 1000))
1403 mtu "" ovs_br0 $((${ll_mtu} + 1000))
1404 mtu "" veth_A-C $((${ll_mtu} + 1000))
1405 mtu "${ns_c}" veth_C-A $((${ll_mtu} + 1000))
1406 mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000))
1407 mtu "${ns_b}" veth_B-R1 ${ll_mtu}
1408 mtu "${ns_r1}" veth_R1-B ${ll_mtu}
1410 mtu "" ${tun_a} $((${ll_mtu} + 1000))
1411 mtu "${ns_b}" ${type}_b $((${ll_mtu} + 1000))
1413 run_cmd ${ns_c} ${ping} -q -M want -i 0.1 -c 20 -s $((${ll_mtu} + 500)) ${dst} || return 1
1415 # Check that exceptions were created
1416 pmtu="$(route_get_dst_pmtu_from_exception "${ns_c}" ${dst})"
1417 check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on Open vSwitch ${type} interface"
1420 test_pmtu_ipv4_ovs_vxlan4_exception() {
1421 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception vxlan 4 4
1424 test_pmtu_ipv6_ovs_vxlan4_exception() {
1425 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception vxlan 6 4
1428 test_pmtu_ipv4_ovs_geneve4_exception() {
1429 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception geneve 4 4
1432 test_pmtu_ipv6_ovs_geneve4_exception() {
1433 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception geneve 6 4
1436 test_pmtu_ipv4_ovs_vxlan6_exception() {
1437 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception vxlan 4 6
1440 test_pmtu_ipv6_ovs_vxlan6_exception() {
1441 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception vxlan 6 6
1444 test_pmtu_ipv4_ovs_geneve6_exception() {
1445 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception geneve 4 6
1448 test_pmtu_ipv6_ovs_geneve6_exception() {
1449 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception geneve 6 6
1452 test_pmtu_ipvX_over_fouY_or_gueY() {
1458 setup namespaces routing ${encap}${outer_family}${inner_family} || return $ksft_skip
1459 trace "${ns_a}" ${encap}_a "${ns_b}" ${encap}_b \
1460 "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \
1461 "${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B
1463 if [ ${inner_family} -eq 4 ]; then
1465 dst=${tunnel4_b_addr}
1468 dst=${tunnel6_b_addr}
1471 if [ "${encap}" = "gue" ]; then
1477 if [ ${outer_family} -eq 4 ]; then
1478 # IPv4 header UDP header
1479 exp_mtu=$((${ll_mtu} - 20 - 8 - ${encap_overhead}))
1481 # IPv6 header Option 4 UDP header
1482 exp_mtu=$((${ll_mtu} - 40 - 8 - 8 - ${encap_overhead}))
1485 # Create route exception by exceeding link layer MTU
1486 mtu "${ns_a}" veth_A-R1 $((${ll_mtu} + 1000))
1487 mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000))
1488 mtu "${ns_b}" veth_B-R1 ${ll_mtu}
1489 mtu "${ns_r1}" veth_R1-B ${ll_mtu}
1491 mtu "${ns_a}" ${encap}_a $((${ll_mtu} + 1000))
1492 mtu "${ns_b}" ${encap}_b $((${ll_mtu} + 1000))
1493 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${dst}
1495 # Check that exception was created
1496 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst})"
1497 check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on ${encap} interface"
1500 test_pmtu_ipv4_fou4_exception() {
1501 test_pmtu_ipvX_over_fouY_or_gueY 4 4 fou
1504 test_pmtu_ipv6_fou4_exception() {
1505 test_pmtu_ipvX_over_fouY_or_gueY 6 4 fou
1508 test_pmtu_ipv4_fou6_exception() {
1509 test_pmtu_ipvX_over_fouY_or_gueY 4 6 fou
1512 test_pmtu_ipv6_fou6_exception() {
1513 test_pmtu_ipvX_over_fouY_or_gueY 6 6 fou
1516 test_pmtu_ipv4_gue4_exception() {
1517 test_pmtu_ipvX_over_fouY_or_gueY 4 4 gue
1520 test_pmtu_ipv6_gue4_exception() {
1521 test_pmtu_ipvX_over_fouY_or_gueY 6 4 gue
1524 test_pmtu_ipv4_gue6_exception() {
1525 test_pmtu_ipvX_over_fouY_or_gueY 4 6 gue
1528 test_pmtu_ipv6_gue6_exception() {
1529 test_pmtu_ipvX_over_fouY_or_gueY 6 6 gue
1532 test_pmtu_ipvX_over_ipvY_exception() {
1537 setup namespaces routing ip${inner}ip${outer} || return $ksft_skip
1539 trace "${ns_a}" ip_a "${ns_b}" ip_b \
1540 "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \
1541 "${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B
1543 if [ ${inner} -eq 4 ]; then
1545 dst=${tunnel4_b_addr}
1548 dst=${tunnel6_b_addr}
1551 if [ ${outer} -eq 4 ]; then
1553 exp_mtu=$((${ll_mtu} - 20))
1555 # IPv6 header Option 4
1556 exp_mtu=$((${ll_mtu} - 40 - 8))
1559 # Create route exception by exceeding link layer MTU
1560 mtu "${ns_a}" veth_A-R1 $((${ll_mtu} + 1000))
1561 mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000))
1562 mtu "${ns_b}" veth_B-R1 ${ll_mtu}
1563 mtu "${ns_r1}" veth_R1-B ${ll_mtu}
1565 mtu "${ns_a}" ip_a $((${ll_mtu} + 1000)) || return
1566 mtu "${ns_b}" ip_b $((${ll_mtu} + 1000)) || return
1567 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${dst}
1569 # Check that exception was created
1570 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst})"
1571 check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on ip${inner}ip${outer} interface"
1574 test_pmtu_ipv4_ipv4_exception() {
1575 test_pmtu_ipvX_over_ipvY_exception 4 4
1578 test_pmtu_ipv6_ipv4_exception() {
1579 test_pmtu_ipvX_over_ipvY_exception 6 4
1582 test_pmtu_ipv4_ipv6_exception() {
1583 test_pmtu_ipvX_over_ipvY_exception 4 6
1586 test_pmtu_ipv6_ipv6_exception() {
1587 test_pmtu_ipvX_over_ipvY_exception 6 6
1590 test_pmtu_vti4_exception() {
1591 setup namespaces veth vti4 xfrm4 || return $ksft_skip
1592 trace "${ns_a}" veth_a "${ns_b}" veth_b \
1593 "${ns_a}" vti4_a "${ns_b}" vti4_b
1596 vti_mtu=$((veth_mtu - 20))
1598 # SPI SN IV ICV pad length next header
1599 esp_payload_rfc4106=$((vti_mtu - 4 - 4 - 8 - 16 - 1 - 1))
1600 ping_payload=$((esp_payload_rfc4106 - 28))
1602 mtu "${ns_a}" veth_a ${veth_mtu}
1603 mtu "${ns_b}" veth_b ${veth_mtu}
1604 mtu "${ns_a}" vti4_a ${vti_mtu}
1605 mtu "${ns_b}" vti4_b ${vti_mtu}
1607 # Send DF packet without exceeding link layer MTU, check that no
1608 # exception is created
1609 run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s ${ping_payload} ${tunnel4_b_addr}
1610 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel4_b_addr})"
1611 check_pmtu_value "" "${pmtu}" "sending packet smaller than PMTU (IP payload length ${esp_payload_rfc4106})" || return 1
1613 # Now exceed link layer MTU by one byte, check that exception is created
1614 # with the right PMTU value
1615 run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s $((ping_payload + 1)) ${tunnel4_b_addr}
1616 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel4_b_addr})"
1617 check_pmtu_value "${esp_payload_rfc4106}" "${pmtu}" "exceeding PMTU (IP payload length $((esp_payload_rfc4106 + 1)))"
1620 test_pmtu_vti6_exception() {
1621 setup namespaces veth vti6 xfrm6 || return $ksft_skip
1622 trace "${ns_a}" veth_a "${ns_b}" veth_b \
1623 "${ns_a}" vti6_a "${ns_b}" vti6_b
1626 # Create route exception by exceeding link layer MTU
1627 mtu "${ns_a}" veth_a 4000
1628 mtu "${ns_b}" veth_b 4000
1629 mtu "${ns_a}" vti6_a 5000
1630 mtu "${ns_b}" vti6_b 5000
1631 run_cmd ${ns_a} ${ping6} -q -i 0.1 -w 1 -s 60000 ${tunnel6_b_addr}
1633 # Check that exception was created
1634 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})"
1635 check_pmtu_value any "${pmtu}" "creating tunnel exceeding link layer MTU" || return 1
1637 # Decrease tunnel MTU, check for PMTU decrease in route exception
1638 mtu "${ns_a}" vti6_a 3000
1639 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})"
1640 check_pmtu_value "3000" "${pmtu}" "decreasing tunnel MTU" || fail=1
1642 # Increase tunnel MTU, check for PMTU increase in route exception
1643 mtu "${ns_a}" vti6_a 9000
1644 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})"
1645 check_pmtu_value "9000" "${pmtu}" "increasing tunnel MTU" || fail=1
1650 test_pmtu_vti4_udp_exception() {
1651 setup namespaces veth vti4 xfrm4udp || return $ksft_skip
1652 trace "${ns_a}" veth_a "${ns_b}" veth_b \
1653 "${ns_a}" vti4_a "${ns_b}" vti4_b
1656 vti_mtu=$((veth_mtu - 20))
1658 # UDP SPI SN IV ICV pad length next header
1659 esp_payload_rfc4106=$((vti_mtu - 8 - 4 - 4 - 8 - 16 - 1 - 1))
1660 ping_payload=$((esp_payload_rfc4106 - 28))
1662 mtu "${ns_a}" veth_a ${veth_mtu}
1663 mtu "${ns_b}" veth_b ${veth_mtu}
1664 mtu "${ns_a}" vti4_a ${vti_mtu}
1665 mtu "${ns_b}" vti4_b ${vti_mtu}
1667 # Send DF packet without exceeding link layer MTU, check that no
1668 # exception is created
1669 run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s ${ping_payload} ${tunnel4_b_addr}
1670 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel4_b_addr})"
1671 check_pmtu_value "" "${pmtu}" "sending packet smaller than PMTU (IP payload length ${esp_payload_rfc4106})" || return 1
1673 # Now exceed link layer MTU by one byte, check that exception is created
1674 # with the right PMTU value
1675 run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s $((ping_payload + 1)) ${tunnel4_b_addr}
1676 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel4_b_addr})"
1677 check_pmtu_value "${esp_payload_rfc4106}" "${pmtu}" "exceeding PMTU (IP payload length $((esp_payload_rfc4106 + 1)))"
1680 test_pmtu_vti6_udp_exception() {
1681 setup namespaces veth vti6 xfrm6udp || return $ksft_skip
1682 trace "${ns_a}" veth_a "${ns_b}" veth_b \
1683 "${ns_a}" vti6_a "${ns_b}" vti6_b
1686 # Create route exception by exceeding link layer MTU
1687 mtu "${ns_a}" veth_a 4000
1688 mtu "${ns_b}" veth_b 4000
1689 mtu "${ns_a}" vti6_a 5000
1690 mtu "${ns_b}" vti6_b 5000
1691 run_cmd ${ns_a} ${ping6} -q -i 0.1 -w 1 -s 60000 ${tunnel6_b_addr}
1693 # Check that exception was created
1694 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})"
1695 check_pmtu_value any "${pmtu}" "creating tunnel exceeding link layer MTU" || return 1
1697 # Decrease tunnel MTU, check for PMTU decrease in route exception
1698 mtu "${ns_a}" vti6_a 3000
1699 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})"
1700 check_pmtu_value "3000" "${pmtu}" "decreasing tunnel MTU" || fail=1
1702 # Increase tunnel MTU, check for PMTU increase in route exception
1703 mtu "${ns_a}" vti6_a 9000
1704 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})"
1705 check_pmtu_value "9000" "${pmtu}" "increasing tunnel MTU" || fail=1
1710 test_pmtu_vti4_udp_routed_exception() {
1711 setup namespaces routing vti4routed xfrm4udprouted || return $ksft_skip
1712 trace "${ns_a}" veth_A-R1 "${ns_b}" veth_B-R1 \
1713 "${ns_a}" vti4_a "${ns_b}" vti4_b
1716 vti_mtu=$((veth_mtu - 20))
1718 # UDP SPI SN IV ICV pad length next header
1719 esp_payload_rfc4106=$((vti_mtu - 8 - 4 - 4 - 8 - 16 - 1 - 1))
1720 ping_payload=$((esp_payload_rfc4106 - 28))
1722 mtu "${ns_a}" veth_A-R1 ${veth_mtu}
1723 mtu "${ns_r1}" veth_R1-A ${veth_mtu}
1724 mtu "${ns_b}" veth_B-R1 ${veth_mtu}
1725 mtu "${ns_r1}" veth_R1-B ${veth_mtu}
1727 mtu "${ns_a}" vti4_a ${vti_mtu}
1728 mtu "${ns_b}" vti4_b ${vti_mtu}
1730 # Send DF packet without exceeding link layer MTU, check that no
1731 # exception is created
1732 run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s ${ping_payload} ${tunnel4_b_addr}
1733 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel4_b_addr})"
1734 check_pmtu_value "" "${pmtu}" "sending packet smaller than PMTU (IP payload length ${esp_payload_rfc4106})" || return 1
1736 # Now decrease link layer MTU by 8 bytes on R1, check that exception is created
1737 # with the right PMTU value
1738 mtu "${ns_r1}" veth_R1-B $((veth_mtu - 8))
1739 run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s $((ping_payload)) ${tunnel4_b_addr}
1740 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel4_b_addr})"
1741 check_pmtu_value "$((esp_payload_rfc4106 - 8))" "${pmtu}" "exceeding PMTU (IP payload length $((esp_payload_rfc4106)))"
1744 test_pmtu_vti6_udp_routed_exception() {
1745 setup namespaces routing vti6routed xfrm6udprouted || return $ksft_skip
1746 trace "${ns_a}" veth_A-R1 "${ns_b}" veth_B-R1 \
1747 "${ns_a}" vti6_a "${ns_b}" vti6_b
1750 vti_mtu=$((veth_mtu - 40))
1752 # UDP SPI SN IV ICV pad length next header
1753 esp_payload_rfc4106=$((vti_mtu - 8 - 4 - 4 - 8 - 16 - 1 - 1))
1754 ping_payload=$((esp_payload_rfc4106 - 48))
1756 mtu "${ns_a}" veth_A-R1 ${veth_mtu}
1757 mtu "${ns_r1}" veth_R1-A ${veth_mtu}
1758 mtu "${ns_b}" veth_B-R1 ${veth_mtu}
1759 mtu "${ns_r1}" veth_R1-B ${veth_mtu}
1761 # mtu "${ns_a}" vti6_a ${vti_mtu}
1762 # mtu "${ns_b}" vti6_b ${vti_mtu}
1764 run_cmd ${ns_a} ${ping6} -q -M want -i 0.1 -w 1 -s ${ping_payload} ${tunnel6_b_addr}
1766 # Check that exception was not created
1767 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})"
1768 check_pmtu_value "" "${pmtu}" "sending packet smaller than PMTU (IP payload length ${esp_payload_rfc4106})" || return 1
1770 # Now decrease link layer MTU by 8 bytes on R1, check that exception is created
1771 # with the right PMTU value
1772 mtu "${ns_r1}" veth_R1-B $((veth_mtu - 8))
1773 run_cmd ${ns_a} ${ping6} -q -M want -i 0.1 -w 1 -s $((ping_payload)) ${tunnel6_b_addr}
1774 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})"
1775 check_pmtu_value "$((esp_payload_rfc4106 - 8))" "${pmtu}" "exceeding PMTU (IP payload length $((esp_payload_rfc4106)))"
1779 test_pmtu_vti4_default_mtu() {
1780 setup namespaces veth vti4 || return $ksft_skip
1782 # Check that MTU of vti device is MTU of veth minus IPv4 header length
1783 veth_mtu="$(link_get_mtu "${ns_a}" veth_a)"
1784 vti4_mtu="$(link_get_mtu "${ns_a}" vti4_a)"
1785 if [ $((veth_mtu - vti4_mtu)) -ne 20 ]; then
1786 err " vti MTU ${vti4_mtu} is not veth MTU ${veth_mtu} minus IPv4 header length"
1791 test_pmtu_vti6_default_mtu() {
1792 setup namespaces veth vti6 || return $ksft_skip
1794 # Check that MTU of vti device is MTU of veth minus IPv6 header length
1795 veth_mtu="$(link_get_mtu "${ns_a}" veth_a)"
1796 vti6_mtu="$(link_get_mtu "${ns_a}" vti6_a)"
1797 if [ $((veth_mtu - vti6_mtu)) -ne 40 ]; then
1798 err " vti MTU ${vti6_mtu} is not veth MTU ${veth_mtu} minus IPv6 header length"
1803 test_pmtu_vti4_link_add_mtu() {
1804 setup namespaces || return $ksft_skip
1806 run_cmd ${ns_a} ip link add vti4_a type vti local ${veth4_a_addr} remote ${veth4_b_addr} key 10
1807 [ $? -ne 0 ] && err " vti not supported" && return $ksft_skip
1808 run_cmd ${ns_a} ip link del vti4_a
1814 # Check invalid values first
1815 for v in $((min - 1)) $((max + 1)); do
1816 run_cmd ${ns_a} ip link add vti4_a mtu ${v} type vti local ${veth4_a_addr} remote ${veth4_b_addr} key 10
1817 # This can fail, or MTU can be adjusted to a proper value
1818 [ $? -ne 0 ] && continue
1819 mtu="$(link_get_mtu "${ns_a}" vti4_a)"
1820 if [ ${mtu} -lt ${min} -o ${mtu} -gt ${max} ]; then
1821 err " vti tunnel created with invalid MTU ${mtu}"
1824 run_cmd ${ns_a} ip link del vti4_a
1827 # Now check valid values
1828 for v in ${min} 1300 ${max}; do
1829 run_cmd ${ns_a} ip link add vti4_a mtu ${v} type vti local ${veth4_a_addr} remote ${veth4_b_addr} key 10
1830 mtu="$(link_get_mtu "${ns_a}" vti4_a)"
1831 run_cmd ${ns_a} ip link del vti4_a
1832 if [ "${mtu}" != "${v}" ]; then
1833 err " vti MTU ${mtu} doesn't match configured value ${v}"
1841 test_pmtu_vti6_link_add_mtu() {
1842 setup namespaces || return $ksft_skip
1844 run_cmd ${ns_a} ip link add vti6_a type vti6 local ${veth6_a_addr} remote ${veth6_b_addr} key 10
1845 [ $? -ne 0 ] && err " vti6 not supported" && return $ksft_skip
1846 run_cmd ${ns_a} ip link del vti6_a
1850 min=68 # vti6 can carry IPv4 packets too
1852 # Check invalid values first
1853 for v in $((min - 1)) $((max + 1)); do
1854 run_cmd ${ns_a} ip link add vti6_a mtu ${v} type vti6 local ${veth6_a_addr} remote ${veth6_b_addr} key 10
1855 # This can fail, or MTU can be adjusted to a proper value
1856 [ $? -ne 0 ] && continue
1857 mtu="$(link_get_mtu "${ns_a}" vti6_a)"
1858 if [ ${mtu} -lt ${min} -o ${mtu} -gt ${max} ]; then
1859 err " vti6 tunnel created with invalid MTU ${v}"
1862 run_cmd ${ns_a} ip link del vti6_a
1865 # Now check valid values
1866 for v in 68 1280 1300 $((65535 - 40)); do
1867 run_cmd ${ns_a} ip link add vti6_a mtu ${v} type vti6 local ${veth6_a_addr} remote ${veth6_b_addr} key 10
1868 mtu="$(link_get_mtu "${ns_a}" vti6_a)"
1869 run_cmd ${ns_a} ip link del vti6_a
1870 if [ "${mtu}" != "${v}" ]; then
1871 err " vti6 MTU ${mtu} doesn't match configured value ${v}"
1879 test_pmtu_vti6_link_change_mtu() {
1880 setup namespaces || return $ksft_skip
1882 run_cmd ${ns_a} ip link add dummy0 mtu 1500 type dummy
1883 [ $? -ne 0 ] && err " dummy not supported" && return $ksft_skip
1884 run_cmd ${ns_a} ip link add dummy1 mtu 3000 type dummy
1885 run_cmd ${ns_a} ip link set dummy0 up
1886 run_cmd ${ns_a} ip link set dummy1 up
1888 run_cmd ${ns_a} ip addr add ${dummy6_0_prefix}1/${dummy6_mask} dev dummy0
1889 run_cmd ${ns_a} ip addr add ${dummy6_1_prefix}1/${dummy6_mask} dev dummy1
1893 # Create vti6 interface bound to device, passing MTU, check it
1894 run_cmd ${ns_a} ip link add vti6_a mtu 1300 type vti6 remote ${dummy6_0_prefix}2 local ${dummy6_0_prefix}1
1895 mtu="$(link_get_mtu "${ns_a}" vti6_a)"
1896 if [ ${mtu} -ne 1300 ]; then
1897 err " vti6 MTU ${mtu} doesn't match configured value 1300"
1901 # Move to another device with different MTU, without passing MTU, check
1903 run_cmd ${ns_a} ip link set vti6_a type vti6 remote ${dummy6_1_prefix}2 local ${dummy6_1_prefix}1
1904 mtu="$(link_get_mtu "${ns_a}" vti6_a)"
1905 if [ ${mtu} -ne $((3000 - 40)) ]; then
1906 err " vti MTU ${mtu} is not dummy MTU 3000 minus IPv6 header length"
1910 # Move it back, passing MTU, check MTU is not overridden
1911 run_cmd ${ns_a} ip link set vti6_a mtu 1280 type vti6 remote ${dummy6_0_prefix}2 local ${dummy6_0_prefix}1
1912 mtu="$(link_get_mtu "${ns_a}" vti6_a)"
1913 if [ ${mtu} -ne 1280 ]; then
1914 err " vti6 MTU ${mtu} doesn't match configured value 1280"
1924 if ! which ${cmd} > /dev/null 2>&1; then
1925 err " missing required command: '${cmd}'"
1931 test_cleanup_vxlanX_exception() {
1936 check_command taskset || return $ksft_skip
1937 cpu_list=$(grep -m 2 processor /proc/cpuinfo | cut -d ' ' -f 2)
1939 setup namespaces routing ${encap}${outer} || return $ksft_skip
1940 trace "${ns_a}" ${encap}_a "${ns_b}" ${encap}_b \
1941 "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \
1942 "${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B
1944 # Create route exception by exceeding link layer MTU
1945 mtu "${ns_a}" veth_A-R1 $((${ll_mtu} + 1000))
1946 mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000))
1947 mtu "${ns_b}" veth_B-R1 ${ll_mtu}
1948 mtu "${ns_r1}" veth_R1-B ${ll_mtu}
1950 mtu "${ns_a}" ${encap}_a $((${ll_mtu} + 1000))
1951 mtu "${ns_b}" ${encap}_b $((${ll_mtu} + 1000))
1953 # Fill exception cache for multiple CPUs (2)
1954 # we can always use inner IPv4 for that
1955 for cpu in ${cpu_list}; do
1956 run_cmd taskset --cpu-list ${cpu} ${ns_a} ping -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${tunnel4_b_addr}
1959 ${ns_a} ip link del dev veth_A-R1 &
1962 if [ "$(cat /proc/${iplink_pid}/cmdline 2>/dev/null | tr -d '\0')" = "iplinkdeldevveth_A-R1" ]; then
1963 err " can't delete veth device in a timely manner, PMTU dst likely leaked"
1968 test_cleanup_ipv6_exception() {
1969 test_cleanup_vxlanX_exception 6
1972 test_cleanup_ipv4_exception() {
1973 test_cleanup_vxlanX_exception 4
1983 # Since cleanup() relies on variables modified by this subshell, it
1984 # has to run in this context.
1987 if [ "$VERBOSE" = "1" ]; then
1988 printf "\n##########################################################################\n\n"
1994 if [ $ret -eq 0 ]; then
1995 printf "TEST: %-60s [ OK ]\n" "${tdesc}"
1996 elif [ $ret -eq 1 ]; then
1997 printf "TEST: %-60s [FAIL]\n" "${tdesc}"
1998 if [ "${PAUSE_ON_FAIL}" = "yes" ]; then
2000 echo "Pausing. Hit enter to continue"
2005 elif [ $ret -eq $ksft_skip ]; then
2006 printf "TEST: %-60s [SKIP]\n" "${tdesc}"
2016 [ $exitcode=$ksft_skip ] && exitcode=0
2019 [ $all_skipped = true ] && exitcode=$ksft_skip
2035 run_test "${tname}" "${tdesc} - nexthop objects"
2039 test_list_flush_ipv4_exception() {
2040 setup namespaces routing || return $ksft_skip
2041 trace "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \
2042 "${ns_r1}" veth_R1-B "${ns_b}" veth_B-R1 \
2043 "${ns_a}" veth_A-R2 "${ns_r2}" veth_R2-A \
2044 "${ns_r2}" veth_R2-B "${ns_b}" veth_B-R2
2046 dst_prefix1="${prefix4}.${b_r1}."
2047 dst2="${prefix4}.${b_r2}.1"
2049 # Set up initial MTU values
2050 mtu "${ns_a}" veth_A-R1 2000
2051 mtu "${ns_r1}" veth_R1-A 2000
2052 mtu "${ns_r1}" veth_R1-B 1500
2053 mtu "${ns_b}" veth_B-R1 1500
2055 mtu "${ns_a}" veth_A-R2 2000
2056 mtu "${ns_r2}" veth_R2-A 2000
2057 mtu "${ns_r2}" veth_R2-B 1500
2058 mtu "${ns_b}" veth_B-R2 1500
2062 # Add 100 addresses for veth endpoint on B reached by default A route
2063 for i in $(seq 100 199); do
2064 run_cmd ${ns_b} ip addr add "${dst_prefix1}${i}" dev veth_B-R1
2067 # Create 100 cached route exceptions for path via R1, one via R2. Note
2068 # that with IPv4 we need to actually cause a route lookup that matches
2069 # the exception caused by ICMP, in order to actually have a cached
2070 # route, so we need to ping each destination twice
2071 for i in $(seq 100 199); do
2072 run_cmd ${ns_a} ping -q -M want -i 0.1 -c 2 -s 1800 "${dst_prefix1}${i}"
2074 run_cmd ${ns_a} ping -q -M want -i 0.1 -c 2 -s 1800 "${dst2}"
2076 if [ "$(${ns_a} ip -oneline route list cache | wc -l)" -ne 101 ]; then
2077 err " can't list cached exceptions"
2081 run_cmd ${ns_a} ip route flush cache
2082 pmtu1="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst_prefix}1)"
2083 pmtu2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst_prefix}2)"
2084 if [ -n "${pmtu1}" ] || [ -n "${pmtu2}" ] || \
2085 [ -n "$(${ns_a} ip route list cache)" ]; then
2086 err " can't flush cached exceptions"
2093 test_list_flush_ipv6_exception() {
2094 setup namespaces routing || return $ksft_skip
2095 trace "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \
2096 "${ns_r1}" veth_R1-B "${ns_b}" veth_B-R1 \
2097 "${ns_a}" veth_A-R2 "${ns_r2}" veth_R2-A \
2098 "${ns_r2}" veth_R2-B "${ns_b}" veth_B-R2
2100 dst_prefix1="${prefix6}:${b_r1}::"
2101 dst2="${prefix6}:${b_r2}::1"
2103 # Set up initial MTU values
2104 mtu "${ns_a}" veth_A-R1 2000
2105 mtu "${ns_r1}" veth_R1-A 2000
2106 mtu "${ns_r1}" veth_R1-B 1500
2107 mtu "${ns_b}" veth_B-R1 1500
2109 mtu "${ns_a}" veth_A-R2 2000
2110 mtu "${ns_r2}" veth_R2-A 2000
2111 mtu "${ns_r2}" veth_R2-B 1500
2112 mtu "${ns_b}" veth_B-R2 1500
2116 # Add 100 addresses for veth endpoint on B reached by default A route
2117 for i in $(seq 100 199); do
2118 run_cmd ${ns_b} ip addr add "${dst_prefix1}${i}" dev veth_B-R1
2121 # Create 100 cached route exceptions for path via R1, one via R2
2122 for i in $(seq 100 199); do
2123 run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s 1800 "${dst_prefix1}${i}"
2125 run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s 1800 "${dst2}"
2126 if [ "$(${ns_a} ip -oneline -6 route list cache | wc -l)" -ne 101 ]; then
2127 err " can't list cached exceptions"
2131 run_cmd ${ns_a} ip -6 route flush cache
2132 pmtu1="$(route_get_dst_pmtu_from_exception "${ns_a}" "${dst_prefix1}100")"
2133 pmtu2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})"
2134 if [ -n "${pmtu1}" ] || [ -n "${pmtu2}" ] || \
2135 [ -n "$(${ns_a} ip -6 route list cache)" ]; then
2136 err " can't flush cached exceptions"
2143 test_pmtu_ipvX_route_change() {
2146 setup namespaces routing || return 2
2147 trace "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \
2148 "${ns_r1}" veth_R1-B "${ns_b}" veth_B-R1 \
2149 "${ns_a}" veth_A-R2 "${ns_r2}" veth_R2-A \
2150 "${ns_r2}" veth_R2-B "${ns_b}" veth_B-R2
2152 if [ ${family} -eq 4 ]; then
2154 dst1="${prefix4}.${b_r1}.1"
2155 dst2="${prefix4}.${b_r2}.1"
2156 gw="${prefix4}.${a_r1}.2"
2159 dst1="${prefix6}:${b_r1}::1"
2160 dst2="${prefix6}:${b_r2}::1"
2161 gw="${prefix6}:${a_r1}::2"
2164 # Set up initial MTU values
2165 mtu "${ns_a}" veth_A-R1 2000
2166 mtu "${ns_r1}" veth_R1-A 2000
2167 mtu "${ns_r1}" veth_R1-B 1400
2168 mtu "${ns_b}" veth_B-R1 1400
2170 mtu "${ns_a}" veth_A-R2 2000
2171 mtu "${ns_r2}" veth_R2-A 2000
2172 mtu "${ns_r2}" veth_R2-B 1500
2173 mtu "${ns_b}" veth_B-R2 1500
2175 # Create route exceptions
2176 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1800 ${dst1}
2177 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1800 ${dst2}
2179 # Check that exceptions have been created with the correct PMTU
2180 pmtu_1="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst1})"
2181 check_pmtu_value "1400" "${pmtu_1}" "exceeding MTU" || return 1
2182 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})"
2183 check_pmtu_value "1500" "${pmtu_2}" "exceeding MTU" || return 1
2185 # Replace the route from A to R1
2186 run_cmd ${ns_a} ip route change default via ${gw}
2188 # Delete the device in A
2189 run_cmd ${ns_a} ip link del "veth_A-R1"
2192 test_pmtu_ipv4_route_change() {
2193 test_pmtu_ipvX_route_change 4
2196 test_pmtu_ipv6_route_change() {
2197 test_pmtu_ipvX_route_change 6
2202 echo "$0 [OPTIONS] [TEST]..."
2203 echo "If no TEST argument is given, all tests will be run."
2206 echo " --trace: capture traffic to TEST_INTERFACE.pcap"
2208 echo "Available tests${tests}"
2212 ################################################################################
2218 while getopts :ptv o
2221 p) PAUSE_ON_FAIL=yes;;
2223 t) if which tcpdump > /dev/null 2>&1; then
2226 echo "=== tcpdump not available, tracing disabled"
2232 shift $(($OPTIND-1))
2238 # Check first that all requested tests are available before running any
2239 command -v > /dev/null "test_${arg}" || { echo "=== Test ${arg} not found"; usage; }
2248 ip nexthop ls >/dev/null 2>&1
2249 [ $? -eq 0 ] && HAVE_NH=yes
2254 for t in ${tests}; do
2255 [ "${name}" = "" ] && name="${t}" && continue
2256 [ "${desc}" = "" ] && desc="${t}" && continue
2258 if [ "${HAVE_NH}" = "yes" ]; then
2264 [ "${arg}" != "${arg#--*}" ] && continue
2265 [ "${arg}" = "${name}" ] && run_this=1 && break
2268 if [ $run_this -eq 1 ]; then
2269 run_test "${name}" "${desc}"
2270 # if test was skipped no need to retry with nexthop objects
2271 [ $? -eq $ksft_skip ] && rerun_nh=0
2273 if [ "${rerun_nh}" = "1" ]; then
2274 run_test_nh "${name}" "${desc}"