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
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"
271 # Addressing and routing for tests with routers: four network segments, with
272 # index SEGMENT between 1 and 4, a common prefix (PREFIX4 or PREFIX6) and an
273 # identifier ID, which is 1 for hosts (A and B), 2 for routers (R1 and R2).
275 # - IPv4: PREFIX4.SEGMENT.ID (/24)
276 # - IPv6: PREFIX6:SEGMENT::ID (/64)
290 # Traffic from A to B goes through R1 by default, and through R2, if destined to
291 # B's address on the b_r2 segment.
292 # Traffic from B to A goes through R1.
293 # ns destination gateway
295 A default ${prefix4}.${a_r1}.2
296 A ${prefix4}.${b_r2}.1 ${prefix4}.${a_r2}.2
297 B default ${prefix4}.${b_r1}.2
299 A default ${prefix6}:${a_r1}::2
300 A ${prefix6}:${b_r2}::1 ${prefix6}:${a_r2}::2
301 B default ${prefix6}:${b_r1}::2
304 # ns family nh id destination gateway
306 A 4 41 ${prefix4}.${a_r1}.2 veth_A-R1
307 A 4 42 ${prefix4}.${a_r2}.2 veth_A-R2
308 B 4 41 ${prefix4}.${b_r1}.2 veth_B-R1
310 A 6 61 ${prefix6}:${a_r1}::2 veth_A-R1
311 A 6 62 ${prefix6}:${a_r2}::2 veth_A-R2
312 B 6 61 ${prefix6}:${b_r1}::2 veth_B-R1
315 # nexthop id correlates to id in nexthops config above
316 # ns family prefix nh id
319 A 4 ${prefix4}.${b_r2}.1 42
323 A 6 ${prefix6}:${b_r2}::1 62
330 veth4_a_addr="192.168.1.1"
331 veth4_b_addr="192.168.1.2"
332 veth4_c_addr="192.168.2.10"
334 veth6_a_addr="fd00:1::a"
335 veth6_b_addr="fd00:1::b"
336 veth6_c_addr="fd00:2::c"
339 tunnel4_a_addr="192.168.2.1"
340 tunnel4_b_addr="192.168.2.2"
342 tunnel6_a_addr="fd00:2::a"
343 tunnel6_b_addr="fd00:2::b"
346 dummy6_0_prefix="fc00:1000::"
347 dummy6_1_prefix="fc00:1001::"
357 err_buf="${err_buf}${1}
369 if [ "$VERBOSE" = "1" ]; then
370 printf " COMMAND: $cmd\n"
375 if [ "$VERBOSE" = "1" -a -n "$out" ]; then
386 if [ "$VERBOSE" = "1" ]; then
387 printf " COMMAND: %s &\n" "${cmd}"
393 # Find the auto-generated name for this namespace
403 if [ "${outer}" = "4" ]; then
404 modprobe fou || return $ksft_skip
405 a_addr="${prefix4}.${a_r1}.1"
406 b_addr="${prefix4}.${b_r1}.1"
407 if [ "${inner}" = "4" ]; then
415 modprobe fou6 || return $ksft_skip
416 a_addr="${prefix6}:${a_r1}::1"
417 b_addr="${prefix6}:${b_r1}::1"
418 if [ "${inner}" = "4" ]; then
429 run_cmd ${ns_a} ip fou add port 5555 ipproto ${ipproto} || return $ksft_skip
430 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
432 run_cmd ${ns_b} ip fou add port 5556 ipproto ${ipproto}
433 run_cmd ${ns_b} ip link add ${encap}_b type ${type} ${mode} local ${b_addr} remote ${a_addr} encap ${encap} encap-sport auto encap-dport 5555
435 if [ "${inner}" = "4" ]; then
436 run_cmd ${ns_a} ip addr add ${tunnel4_a_addr}/${tunnel4_mask} dev ${encap}_a
437 run_cmd ${ns_b} ip addr add ${tunnel4_b_addr}/${tunnel4_mask} dev ${encap}_b
439 run_cmd ${ns_a} ip addr add ${tunnel6_a_addr}/${tunnel6_mask} dev ${encap}_a
440 run_cmd ${ns_b} ip addr add ${tunnel6_b_addr}/${tunnel6_mask} dev ${encap}_b
443 run_cmd ${ns_a} ip link set ${encap}_a up
444 run_cmd ${ns_b} ip link set ${encap}_b up
448 setup_fou_or_gue 4 4 fou
452 setup_fou_or_gue 4 6 fou
456 setup_fou_or_gue 6 4 fou
460 setup_fou_or_gue 6 6 fou
464 setup_fou_or_gue 4 4 gue
468 setup_fou_or_gue 4 6 gue
472 setup_fou_or_gue 6 4 gue
476 setup_fou_or_gue 6 6 gue
479 setup_ipvX_over_ipvY() {
483 if [ "${outer}" -eq 4 ]; then
484 a_addr="${prefix4}.${a_r1}.1"
485 b_addr="${prefix4}.${b_r1}.1"
486 if [ "${inner}" -eq 4 ]; then
494 a_addr="${prefix6}:${a_r1}::1"
495 b_addr="${prefix6}:${b_r1}::1"
497 if [ "${inner}" -eq 4 ]; then
504 run_cmd ${ns_a} ip link add ip_a type ${type} local ${a_addr} remote ${b_addr} mode ${mode} || return $ksft_skip
505 run_cmd ${ns_b} ip link add ip_b type ${type} local ${b_addr} remote ${a_addr} mode ${mode}
507 run_cmd ${ns_a} ip link set ip_a up
508 run_cmd ${ns_b} ip link set ip_b up
510 if [ "${inner}" = "4" ]; then
511 run_cmd ${ns_a} ip addr add ${tunnel4_a_addr}/${tunnel4_mask} dev ip_a
512 run_cmd ${ns_b} ip addr add ${tunnel4_b_addr}/${tunnel4_mask} dev ip_b
514 run_cmd ${ns_a} ip addr add ${tunnel6_a_addr}/${tunnel6_mask} dev ip_a
515 run_cmd ${ns_b} ip addr add ${tunnel6_b_addr}/${tunnel6_mask} dev ip_b
520 setup_ipvX_over_ipvY 4 4
524 setup_ipvX_over_ipvY 6 4
528 setup_ipvX_over_ipvY 4 6
532 setup_ipvX_over_ipvY 6 6
536 setup_ns NS_A NS_B NS_C NS_R1 NS_R2
537 for n in ${NS_A} ${NS_B} ${NS_C} ${NS_R1} ${NS_R2}; do
538 # Disable DAD, so that we don't have to wait to use the
539 # configured IPv6 addresses
540 ip netns exec ${n} sysctl -q net/ipv6/conf/default/accept_dad=0
542 ns_a="ip netns exec ${NS_A}"
543 ns_b="ip netns exec ${NS_B}"
544 ns_c="ip netns exec ${NS_C}"
545 ns_r1="ip netns exec ${NS_R1}"
546 ns_r2="ip netns exec ${NS_R2}"
550 run_cmd ${ns_a} ip link add veth_a type veth peer name veth_b || return 1
551 run_cmd ${ns_a} ip link set veth_b netns ${NS_B}
553 run_cmd ${ns_a} ip addr add ${veth4_a_addr}/${veth4_mask} dev veth_a
554 run_cmd ${ns_b} ip addr add ${veth4_b_addr}/${veth4_mask} dev veth_b
556 run_cmd ${ns_a} ip addr add ${veth6_a_addr}/${veth6_mask} dev veth_a
557 run_cmd ${ns_b} ip addr add ${veth6_b_addr}/${veth6_mask} dev veth_b
559 run_cmd ${ns_a} ip link set veth_a up
560 run_cmd ${ns_b} ip link set veth_b up
571 [ ${proto} -eq 6 ] && vti_type="vti6" || vti_type="vti"
573 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
574 run_cmd ${ns_b} ip link add vti${proto}_b type ${vti_type} local ${veth_b_addr} remote ${veth_a_addr} key 10
576 run_cmd ${ns_a} ip addr add ${vti_a_addr}/${vti_mask} dev vti${proto}_a
577 run_cmd ${ns_b} ip addr add ${vti_b_addr}/${vti_mask} dev vti${proto}_b
579 run_cmd ${ns_a} ip link set vti${proto}_a up
580 run_cmd ${ns_b} ip link set vti${proto}_b up
584 setup_vti 4 ${veth4_a_addr} ${veth4_b_addr} ${tunnel4_a_addr} ${tunnel4_b_addr} ${tunnel4_mask}
588 setup_vti 6 ${veth6_a_addr} ${veth6_b_addr} ${tunnel6_a_addr} ${tunnel6_b_addr} ${tunnel6_mask}
592 setup_vti 4 ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1 ${tunnel4_a_addr} ${tunnel4_b_addr} ${tunnel4_mask}
596 setup_vti 6 ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 ${tunnel6_a_addr} ${tunnel6_b_addr} ${tunnel6_mask}
599 setup_vxlan_or_geneve() {
606 if [ "${type}" = "vxlan" ]; then
607 opts="${opts} ttl 64 dstport 4789"
608 opts_a="local ${a_addr}"
609 opts_b="local ${b_addr}"
615 run_cmd ${ns_a} ip link add ${type}_a type ${type} id 1 ${opts_a} remote ${b_addr} ${opts} || return 1
616 run_cmd ${ns_b} ip link add ${type}_b type ${type} id 1 ${opts_b} remote ${a_addr} ${opts}
618 if [ -n "${br_if_a}" ]; then
619 run_cmd ${ns_a} ip addr add ${tunnel4_a_addr}/${tunnel4_mask} dev ${br_if_a}
620 run_cmd ${ns_a} ip addr add ${tunnel6_a_addr}/${tunnel6_mask} dev ${br_if_a}
621 run_cmd ${ns_a} ip link set ${type}_a master ${br_if_a}
623 run_cmd ${ns_a} ip addr add ${tunnel4_a_addr}/${tunnel4_mask} dev ${type}_a
624 run_cmd ${ns_a} ip addr add ${tunnel6_a_addr}/${tunnel6_mask} dev ${type}_a
627 run_cmd ${ns_b} ip addr add ${tunnel4_b_addr}/${tunnel4_mask} dev ${type}_b
628 run_cmd ${ns_b} ip addr add ${tunnel6_b_addr}/${tunnel6_mask} dev ${type}_b
630 run_cmd ${ns_a} ip link set ${type}_a up
631 run_cmd ${ns_b} ip link set ${type}_b up
635 setup_vxlan_or_geneve geneve ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1 "df set"
639 setup_vxlan_or_geneve vxlan ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1 "df set"
643 setup_vxlan_or_geneve geneve ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 ""
647 setup_vxlan_or_geneve vxlan ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 ""
650 setup_bridged_geneve4() {
651 setup_vxlan_or_geneve geneve ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1 "df set" "br0"
654 setup_bridged_vxlan4() {
655 setup_vxlan_or_geneve vxlan ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1 "df set" "br0"
658 setup_bridged_geneve6() {
659 setup_vxlan_or_geneve geneve ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 "" "br0"
662 setup_bridged_vxlan6() {
663 setup_vxlan_or_geneve vxlan ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 "" "br0"
672 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
673 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}
674 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
675 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
677 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}
678 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}
679 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
680 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
683 setup_nettest_xfrm() {
684 if ! which nettest >/dev/null; then
686 if ! which nettest >/dev/null; then
687 echo "'nettest' command not found; skipping tests"
692 [ ${1} -eq 6 ] && proto="-6" || proto=""
695 run_cmd_bg "${ns_a}" nettest "${proto}" -q -D -s -x -p "${port}" -t 5
696 nettest_pids="${nettest_pids} $!"
698 run_cmd_bg "${ns_b}" nettest "${proto}" -q -D -s -x -p "${port}" -t 5
699 nettest_pids="${nettest_pids} $!"
703 setup_xfrm 4 ${veth4_a_addr} ${veth4_b_addr}
707 setup_xfrm 6 ${veth6_a_addr} ${veth6_b_addr}
711 setup_xfrm 4 ${veth4_a_addr} ${veth4_b_addr} "encap espinudp 4500 4500 0.0.0.0" && \
712 setup_nettest_xfrm 4 4500
716 setup_xfrm 6 ${veth6_a_addr} ${veth6_b_addr} "encap espinudp 4500 4500 0.0.0.0" && \
717 setup_nettest_xfrm 6 4500
720 setup_xfrm4udprouted() {
721 setup_xfrm 4 ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1 "encap espinudp 4500 4500 0.0.0.0" && \
722 setup_nettest_xfrm 4 4500
725 setup_xfrm6udprouted() {
726 setup_xfrm 6 ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 "encap espinudp 4500 4500 0.0.0.0" && \
727 setup_nettest_xfrm 6 4500
730 setup_routing_old() {
731 for i in ${routes}; do
732 [ "${ns}" = "" ] && ns="${i}" && continue
733 [ "${addr}" = "" ] && addr="${i}" && continue
734 [ "${gw}" = "" ] && gw="${i}"
736 ns_name="$(nsname ${ns})"
738 ip -n "${ns_name}" route add "${addr}" table "${rt_table}" via "${gw}"
740 ns=""; addr=""; gw=""
744 setup_routing_new() {
745 for i in ${nexthops}; do
746 [ "${ns}" = "" ] && ns="${i}" && continue
747 [ "${fam}" = "" ] && fam="${i}" && continue
748 [ "${nhid}" = "" ] && nhid="${i}" && continue
749 [ "${gw}" = "" ] && gw="${i}" && continue
750 [ "${dev}" = "" ] && dev="${i}"
752 ns_name="$(nsname ${ns})"
754 ip -n ${ns_name} -${fam} nexthop add id ${nhid} via ${gw} dev ${dev}
756 ns=""; fam=""; nhid=""; gw=""; dev=""
760 for i in ${routes_nh}; do
761 [ "${ns}" = "" ] && ns="${i}" && continue
762 [ "${fam}" = "" ] && fam="${i}" && continue
763 [ "${addr}" = "" ] && addr="${i}" && continue
764 [ "${nhid}" = "" ] && nhid="${i}"
766 ns_name="$(nsname ${ns})"
768 ip -n "${ns_name}" -"${fam}" route add "${addr}" table "${rt_table}" nhid "${nhid}"
770 ns=""; fam=""; addr=""; nhid=""
775 for i in ${NS_R1} ${NS_R2}; do
776 ip netns exec ${i} sysctl -q net/ipv4/ip_forward=1
777 ip netns exec ${i} sysctl -q net/ipv6/conf/all/forwarding=1
780 for i in ${routing_addrs}; do
781 [ "${ns}" = "" ] && ns="${i}" && continue
782 [ "${peer}" = "" ] && peer="${i}" && continue
783 [ "${segment}" = "" ] && segment="${i}"
785 ns_name="$(nsname ${ns})"
786 peer_name="$(nsname ${peer})"
787 if="veth_${ns}-${peer}"
788 ifpeer="veth_${peer}-${ns}"
791 ip link add ${if} up netns ${ns_name} type veth peer name ${ifpeer} netns ${peer_name} || return 1
792 ip -n ${peer_name} link set dev ${ifpeer} up
795 ip -n ${ns_name} addr add ${prefix4}.${segment}.1/24 dev ${if}
796 ip -n ${ns_name} addr add ${prefix6}:${segment}::1/64 dev ${if}
798 ip -n ${peer_name} addr add ${prefix4}.${segment}.2/24 dev ${ifpeer}
799 ip -n ${peer_name} addr add ${prefix6}:${segment}::2/64 dev ${ifpeer}
801 ns=""; peer=""; segment=""
804 if [ "$USE_NH" = "yes" ]; then
813 setup_policy_routing() {
816 ip -netns "${NS_A}" -4 rule add dsfield "${policy_mark}" \
819 # Set the IPv4 Don't Fragment bit with tc, since socat doesn't seem to
820 # have an option do to it.
821 tc -netns "${NS_A}" qdisc replace dev veth_A-R1 root prio
822 tc -netns "${NS_A}" qdisc replace dev veth_A-R2 root prio
823 tc -netns "${NS_A}" filter add dev veth_A-R1 \
824 protocol ipv4 flower ip_proto udp \
825 action pedit ex munge ip df set 0x40 pipe csum ip and udp
826 tc -netns "${NS_A}" filter add dev veth_A-R2 \
827 protocol ipv4 flower ip_proto udp \
828 action pedit ex munge ip df set 0x40 pipe csum ip and udp
832 run_cmd ${ns_a} ip link add br0 type bridge || return $ksft_skip
833 run_cmd ${ns_a} ip link set br0 up
835 run_cmd ${ns_c} ip link add veth_C-A type veth peer name veth_A-C
836 run_cmd ${ns_c} ip link set veth_A-C netns ${NS_A}
838 run_cmd ${ns_a} ip link set veth_A-C up
839 run_cmd ${ns_c} ip link set veth_C-A up
840 run_cmd ${ns_c} ip addr add ${veth4_c_addr}/${veth4_mask} dev veth_C-A
841 run_cmd ${ns_c} ip addr add ${veth6_c_addr}/${veth6_mask} dev veth_C-A
842 run_cmd ${ns_a} ip link set veth_A-C master br0
845 setup_ovs_vxlan_or_geneve() {
850 if [ "${type}" = "vxlan" ]; then
851 opts="${opts} ttl 64 dstport 4789"
852 opts_b="local ${b_addr}"
855 run_cmd ovs-vsctl add-port ovs_br0 ${type}_a -- \
856 set interface ${type}_a type=${type} \
857 options:remote_ip=${b_addr} options:key=1 options:csum=true || return 1
859 run_cmd ${ns_b} ip link add ${type}_b type ${type} id 1 ${opts_b} remote ${a_addr} ${opts} || return 1
861 run_cmd ${ns_b} ip addr add ${tunnel4_b_addr}/${tunnel4_mask} dev ${type}_b
862 run_cmd ${ns_b} ip addr add ${tunnel6_b_addr}/${tunnel6_mask} dev ${type}_b
864 run_cmd ${ns_b} ip link set ${type}_b up
867 setup_ovs_geneve4() {
868 setup_ovs_vxlan_or_geneve geneve ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1
872 setup_ovs_vxlan_or_geneve vxlan ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1
875 setup_ovs_geneve6() {
876 setup_ovs_vxlan_or_geneve geneve ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1
880 setup_ovs_vxlan_or_geneve vxlan ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1
884 run_cmd ovs-vsctl add-br ovs_br0 || return $ksft_skip
885 run_cmd ip link set ovs_br0 up
887 run_cmd ${ns_c} ip link add veth_C-A type veth peer name veth_A-C
888 run_cmd ${ns_c} ip link set veth_A-C netns 1
890 run_cmd ip link set veth_A-C up
891 run_cmd ${ns_c} ip link set veth_C-A up
892 run_cmd ${ns_c} ip addr add ${veth4_c_addr}/${veth4_mask} dev veth_C-A
893 run_cmd ${ns_c} ip addr add ${veth6_c_addr}/${veth6_mask} dev veth_C-A
894 run_cmd ovs-vsctl add-port ovs_br0 veth_A-C
896 # Move veth_A-R1 to init
897 run_cmd ${ns_a} ip link set veth_A-R1 netns 1
898 run_cmd ip addr add ${prefix4}.${a_r1}.1/${veth4_mask} dev veth_A-R1
899 run_cmd ip addr add ${prefix6}:${a_r1}::1/${veth6_mask} dev veth_A-R1
900 run_cmd ip link set veth_A-R1 up
901 run_cmd ip route add ${prefix4}.${b_r1}.1 via ${prefix4}.${a_r1}.2
902 run_cmd ip route add ${prefix6}:${b_r1}::1 via ${prefix6}:${a_r1}::2
906 [ "$(id -u)" -ne 0 ] && echo " need to run as root" && return $ksft_skip
909 eval setup_${arg} || { echo " ${arg} not supported"; return 1; }
914 [ $TRACING -eq 0 ] && return
917 [ "${ns_cmd}" = "" ] && ns_cmd="${arg}" && continue
918 ${ns_cmd} tcpdump --immediate-mode -s 0 -i "${arg}" -w "${name}_${arg}.pcap" 2> /dev/null &
919 tcpdump_pids="${tcpdump_pids} $!"
926 for pid in ${tcpdump_pids}; do
931 for pid in ${nettest_pids}; do
936 for pid in ${socat_pids}; do
943 ip link del veth_A-C 2>/dev/null
944 ip link del veth_A-R1 2>/dev/null
945 ovs-vsctl --if-exists del-port vxlan_a 2>/dev/null
946 ovs-vsctl --if-exists del-br ovs_br0 2>/dev/null
955 ${ns_cmd} ip link set dev ${dev} mtu ${mtu}
962 for i in ${input}; do
963 [ ${next} -eq 1 -a "${i}" = "lock" ] && next=2 && continue
964 [ ${next} -eq 1 ] && echo "${i}" && return
965 [ ${next} -eq 2 ] && echo "lock ${i}" && return
966 [ "${i}" = "mtu" ] && next=1
974 ${ns_cmd} ip link show dev "${name}"
981 mtu_parse "$(link_get "${ns_cmd}" ${name})"
984 route_get_dst_exception() {
989 if [ -z "${dsfield}" ]; then
993 ${ns_cmd} ip route get "${dst}" dsfield "${dsfield}"
996 route_get_dst_pmtu_from_exception() {
1001 mtu_parse "$(route_get_dst_exception "${ns_cmd}" "${dst}" "${dsfield}")"
1004 check_pmtu_value() {
1009 [ "${expected}" = "any" ] && [ -n "${value}" ] && return 0
1010 [ "${value}" = "${expected}" ] && return 0
1011 [ -z "${value}" ] && err " PMTU exception wasn't created after ${event}" && return 1
1012 [ -z "${expected}" ] && err " PMTU exception shouldn't exist after ${event}" && return 1
1013 err " found PMTU exception with incorrect MTU ${value}, expected ${expected}, after ${event}"
1020 setup namespaces routing || return $ksft_skip
1021 trace "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \
1022 "${ns_r1}" veth_R1-B "${ns_b}" veth_B-R1 \
1023 "${ns_a}" veth_A-R2 "${ns_r2}" veth_R2-A \
1024 "${ns_r2}" veth_R2-B "${ns_b}" veth_B-R2
1026 if [ ${family} -eq 4 ]; then
1028 dst1="${prefix4}.${b_r1}.1"
1029 dst2="${prefix4}.${b_r2}.1"
1032 dst1="${prefix6}:${b_r1}::1"
1033 dst2="${prefix6}:${b_r2}::1"
1036 # Set up initial MTU values
1037 mtu "${ns_a}" veth_A-R1 2000
1038 mtu "${ns_r1}" veth_R1-A 2000
1039 mtu "${ns_r1}" veth_R1-B 1400
1040 mtu "${ns_b}" veth_B-R1 1400
1042 mtu "${ns_a}" veth_A-R2 2000
1043 mtu "${ns_r2}" veth_R2-A 2000
1044 mtu "${ns_r2}" veth_R2-B 1500
1045 mtu "${ns_b}" veth_B-R2 1500
1047 # Create route exceptions
1048 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1800 ${dst1}
1049 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1800 ${dst2}
1051 # Check that exceptions have been created with the correct PMTU
1052 pmtu_1="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst1})"
1053 check_pmtu_value "1400" "${pmtu_1}" "exceeding MTU" || return 1
1054 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})"
1055 check_pmtu_value "1500" "${pmtu_2}" "exceeding MTU" || return 1
1057 # Decrease local MTU below PMTU, check for PMTU decrease in route exception
1058 mtu "${ns_a}" veth_A-R1 1300
1059 mtu "${ns_r1}" veth_R1-A 1300
1060 pmtu_1="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst1})"
1061 check_pmtu_value "1300" "${pmtu_1}" "decreasing local MTU" || return 1
1062 # Second exception shouldn't be modified
1063 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})"
1064 check_pmtu_value "1500" "${pmtu_2}" "changing local MTU on a link not on this path" || return 1
1066 # Increase MTU, check for PMTU increase in route exception
1067 mtu "${ns_a}" veth_A-R1 1700
1068 mtu "${ns_r1}" veth_R1-A 1700
1069 pmtu_1="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst1})"
1070 check_pmtu_value "1700" "${pmtu_1}" "increasing local MTU" || return 1
1071 # Second exception shouldn't be modified
1072 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})"
1073 check_pmtu_value "1500" "${pmtu_2}" "changing local MTU on a link not on this path" || return 1
1075 # Skip PMTU locking tests for IPv6
1076 [ $family -eq 6 ] && return 0
1078 # Decrease remote MTU on path via R2, get new exception
1079 mtu "${ns_r2}" veth_R2-B 400
1080 mtu "${ns_b}" veth_B-R2 400
1081 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1400 ${dst2}
1082 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})"
1083 check_pmtu_value "lock 552" "${pmtu_2}" "exceeding MTU, with MTU < min_pmtu" || return 1
1085 # Decrease local MTU below PMTU
1086 mtu "${ns_a}" veth_A-R2 500
1087 mtu "${ns_r2}" veth_R2-A 500
1088 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})"
1089 check_pmtu_value "500" "${pmtu_2}" "decreasing local MTU" || return 1
1091 # Increase local MTU
1092 mtu "${ns_a}" veth_A-R2 1500
1093 mtu "${ns_r2}" veth_R2-A 1500
1094 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})"
1095 check_pmtu_value "1500" "${pmtu_2}" "increasing local MTU" || return 1
1098 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1400 ${dst2}
1099 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})"
1100 check_pmtu_value "lock 552" "${pmtu_2}" "exceeding MTU, with MTU < min_pmtu" || return 1
1103 test_pmtu_ipv4_exception() {
1107 test_pmtu_ipv6_exception() {
1111 test_pmtu_ipv4_dscp_icmp_exception() {
1114 setup namespaces policy_routing || return $ksft_skip
1115 trace "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \
1116 "${ns_r1}" veth_R1-B "${ns_b}" veth_B-R1 \
1117 "${ns_a}" veth_A-R2 "${ns_r2}" veth_R2-A \
1118 "${ns_r2}" veth_R2-B "${ns_b}" veth_B-R2
1120 # Set up initial MTU values
1121 mtu "${ns_a}" veth_A-R1 2000
1122 mtu "${ns_r1}" veth_R1-A 2000
1123 mtu "${ns_r1}" veth_R1-B 1400
1124 mtu "${ns_b}" veth_B-R1 1400
1126 mtu "${ns_a}" veth_A-R2 2000
1127 mtu "${ns_r2}" veth_R2-A 2000
1128 mtu "${ns_r2}" veth_R2-B 1500
1129 mtu "${ns_b}" veth_B-R2 1500
1131 len=$((2000 - 20 - 8)) # Fills MTU of veth_A-R1
1133 dst1="${prefix4}.${b_r1}.1"
1134 dst2="${prefix4}.${b_r2}.1"
1136 # Create route exceptions
1137 dsfield=${policy_mark} # No ECN bit set (Not-ECT)
1138 run_cmd "${ns_a}" ping -q -M want -Q "${dsfield}" -c 1 -w 1 -s "${len}" "${dst1}"
1140 dsfield=$(printf "%#x" $((policy_mark + 0x02))) # ECN=2 (ECT(0))
1141 run_cmd "${ns_a}" ping -q -M want -Q "${dsfield}" -c 1 -w 1 -s "${len}" "${dst2}"
1143 # Check that exceptions have been created with the correct PMTU
1144 pmtu_1="$(route_get_dst_pmtu_from_exception "${ns_a}" "${dst1}" "${policy_mark}")"
1145 check_pmtu_value "1400" "${pmtu_1}" "exceeding MTU" || return 1
1147 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" "${dst2}" "${policy_mark}")"
1148 check_pmtu_value "1500" "${pmtu_2}" "exceeding MTU" || return 1
1151 test_pmtu_ipv4_dscp_udp_exception() {
1154 if ! which socat > /dev/null 2>&1; then
1155 echo "'socat' command not found; skipping tests"
1159 setup namespaces policy_routing || return $ksft_skip
1160 trace "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \
1161 "${ns_r1}" veth_R1-B "${ns_b}" veth_B-R1 \
1162 "${ns_a}" veth_A-R2 "${ns_r2}" veth_R2-A \
1163 "${ns_r2}" veth_R2-B "${ns_b}" veth_B-R2
1165 # Set up initial MTU values
1166 mtu "${ns_a}" veth_A-R1 2000
1167 mtu "${ns_r1}" veth_R1-A 2000
1168 mtu "${ns_r1}" veth_R1-B 1400
1169 mtu "${ns_b}" veth_B-R1 1400
1171 mtu "${ns_a}" veth_A-R2 2000
1172 mtu "${ns_r2}" veth_R2-A 2000
1173 mtu "${ns_r2}" veth_R2-B 1500
1174 mtu "${ns_b}" veth_B-R2 1500
1176 len=$((2000 - 20 - 8)) # Fills MTU of veth_A-R1
1178 dst1="${prefix4}.${b_r1}.1"
1179 dst2="${prefix4}.${b_r2}.1"
1181 # Create route exceptions
1182 run_cmd_bg "${ns_b}" socat UDP-LISTEN:50000 OPEN:/dev/null,wronly=1
1183 socat_pids="${socat_pids} $!"
1185 dsfield=${policy_mark} # No ECN bit set (Not-ECT)
1186 run_cmd "${ns_a}" socat OPEN:/dev/zero,rdonly=1,readbytes="${len}" \
1187 UDP:"${dst1}":50000,tos="${dsfield}"
1189 dsfield=$(printf "%#x" $((policy_mark + 0x02))) # ECN=2 (ECT(0))
1190 run_cmd "${ns_a}" socat OPEN:/dev/zero,rdonly=1,readbytes="${len}" \
1191 UDP:"${dst2}":50000,tos="${dsfield}"
1193 # Check that exceptions have been created with the correct PMTU
1194 pmtu_1="$(route_get_dst_pmtu_from_exception "${ns_a}" "${dst1}" "${policy_mark}")"
1195 check_pmtu_value "1400" "${pmtu_1}" "exceeding MTU" || return 1
1196 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" "${dst2}" "${policy_mark}")"
1197 check_pmtu_value "1500" "${pmtu_2}" "exceeding MTU" || return 1
1200 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception() {
1206 if [ ${outer_family} -eq 4 ]; then
1207 setup namespaces routing ${type}4 || return $ksft_skip
1208 # IPv4 header UDP header VXLAN/GENEVE header Ethernet header
1209 exp_mtu=$((${ll_mtu} - 20 - 8 - 8 - 14))
1211 setup namespaces routing ${type}6 || return $ksft_skip
1212 # IPv6 header UDP header VXLAN/GENEVE header Ethernet header
1213 exp_mtu=$((${ll_mtu} - 40 - 8 - 8 - 14))
1216 trace "${ns_a}" ${type}_a "${ns_b}" ${type}_b \
1217 "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \
1218 "${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B
1220 if [ ${family} -eq 4 ]; then
1222 dst=${tunnel4_b_addr}
1225 dst=${tunnel6_b_addr}
1228 # Create route exception by exceeding link layer MTU
1229 mtu "${ns_a}" veth_A-R1 $((${ll_mtu} + 1000))
1230 mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000))
1231 mtu "${ns_b}" veth_B-R1 ${ll_mtu}
1232 mtu "${ns_r1}" veth_R1-B ${ll_mtu}
1234 mtu "${ns_a}" ${type}_a $((${ll_mtu} + 1000))
1235 mtu "${ns_b}" ${type}_b $((${ll_mtu} + 1000))
1236 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${dst}
1238 # Check that exception was created
1239 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst})"
1240 check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on ${type} interface"
1243 test_pmtu_ipv4_vxlan4_exception() {
1244 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception vxlan 4 4
1247 test_pmtu_ipv6_vxlan4_exception() {
1248 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception vxlan 6 4
1251 test_pmtu_ipv4_geneve4_exception() {
1252 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception geneve 4 4
1255 test_pmtu_ipv6_geneve4_exception() {
1256 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception geneve 6 4
1259 test_pmtu_ipv4_vxlan6_exception() {
1260 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception vxlan 4 6
1263 test_pmtu_ipv6_vxlan6_exception() {
1264 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception vxlan 6 6
1267 test_pmtu_ipv4_geneve6_exception() {
1268 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception geneve 4 6
1271 test_pmtu_ipv6_geneve6_exception() {
1272 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception geneve 6 6
1275 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception() {
1281 if [ ${outer_family} -eq 4 ]; then
1282 setup namespaces routing bridge bridged_${type}4 || return $ksft_skip
1283 # IPv4 header UDP header VXLAN/GENEVE header Ethernet header
1284 exp_mtu=$((${ll_mtu} - 20 - 8 - 8 - 14))
1286 setup namespaces routing bridge bridged_${type}6 || return $ksft_skip
1287 # IPv6 header UDP header VXLAN/GENEVE header Ethernet header
1288 exp_mtu=$((${ll_mtu} - 40 - 8 - 8 - 14))
1291 trace "${ns_a}" ${type}_a "${ns_b}" ${type}_b \
1292 "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \
1293 "${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B \
1294 "${ns_a}" br0 "${ns_a}" veth-A-C \
1297 if [ ${family} -eq 4 ]; then
1299 dst=${tunnel4_b_addr}
1302 dst=${tunnel6_b_addr}
1305 # Create route exception by exceeding link layer MTU
1306 mtu "${ns_a}" veth_A-R1 $((${ll_mtu} + 1000))
1307 mtu "${ns_a}" br0 $((${ll_mtu} + 1000))
1308 mtu "${ns_a}" veth_A-C $((${ll_mtu} + 1000))
1309 mtu "${ns_c}" veth_C-A $((${ll_mtu} + 1000))
1310 mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000))
1311 mtu "${ns_b}" veth_B-R1 ${ll_mtu}
1312 mtu "${ns_r1}" veth_R1-B ${ll_mtu}
1314 mtu "${ns_a}" ${type}_a $((${ll_mtu} + 1000))
1315 mtu "${ns_b}" ${type}_b $((${ll_mtu} + 1000))
1317 run_cmd ${ns_c} ${ping} -q -M want -i 0.1 -c 10 -s $((${ll_mtu} + 500)) ${dst} || return 1
1318 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${dst} || return 1
1320 # Check that exceptions were created
1321 pmtu="$(route_get_dst_pmtu_from_exception "${ns_c}" ${dst})"
1322 check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on bridged ${type} interface"
1323 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst})"
1324 check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on locally bridged ${type} interface"
1326 tmpoutfile=$(mktemp)
1328 # Flush Exceptions, retry with TCP
1329 run_cmd ${ns_a} ip route flush cached ${dst}
1330 run_cmd ${ns_b} ip route flush cached ${dst}
1331 run_cmd ${ns_c} ip route flush cached ${dst}
1333 for target in "${ns_a}" "${ns_c}" ; do
1334 if [ ${family} -eq 4 ]; then
1335 TCPDST=TCP:${dst}:50000
1337 TCPDST="TCP:[${dst}]:50000"
1339 ${ns_b} socat -T 3 -u -6 TCP-LISTEN:50000 STDOUT > $tmpoutfile &
1342 wait_local_port_listen ${NS_B} 50000 tcp
1344 dd if=/dev/zero status=none bs=1M count=1 | ${target} socat -T 3 -u STDIN $TCPDST,connect-timeout=3
1346 size=$(du -sb $tmpoutfile)
1347 size=${size%%/tmp/*}
1350 [ $size -ne 1048576 ] && err "File size $size mismatches exepcted value in locally bridged vxlan test" && return 1
1355 # Check that exceptions were created
1356 pmtu="$(route_get_dst_pmtu_from_exception "${ns_c}" ${dst})"
1357 check_pmtu_value ${exp_mtu} "${pmtu}" "tcp: exceeding link layer MTU on bridged ${type} interface"
1358 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst})"
1359 check_pmtu_value ${exp_mtu} "${pmtu}" "tcp exceeding link layer MTU on locally bridged ${type} interface"
1362 test_pmtu_ipv4_br_vxlan4_exception() {
1363 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception vxlan 4 4
1366 test_pmtu_ipv6_br_vxlan4_exception() {
1367 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception vxlan 6 4
1370 test_pmtu_ipv4_br_geneve4_exception() {
1371 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception geneve 4 4
1374 test_pmtu_ipv6_br_geneve4_exception() {
1375 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception geneve 6 4
1378 test_pmtu_ipv4_br_vxlan6_exception() {
1379 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception vxlan 4 6
1382 test_pmtu_ipv6_br_vxlan6_exception() {
1383 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception vxlan 6 6
1386 test_pmtu_ipv4_br_geneve6_exception() {
1387 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception geneve 4 6
1390 test_pmtu_ipv6_br_geneve6_exception() {
1391 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception geneve 6 6
1394 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception() {
1400 if [ ${outer_family} -eq 4 ]; then
1401 setup namespaces routing ovs_bridge ovs_${type}4 || return $ksft_skip
1402 # IPv4 header UDP header VXLAN/GENEVE header Ethernet header
1403 exp_mtu=$((${ll_mtu} - 20 - 8 - 8 - 14))
1405 setup namespaces routing ovs_bridge ovs_${type}6 || return $ksft_skip
1406 # IPv6 header UDP header VXLAN/GENEVE header Ethernet header
1407 exp_mtu=$((${ll_mtu} - 40 - 8 - 8 - 14))
1410 if [ "${type}" = "vxlan" ]; then
1411 tun_a="vxlan_sys_4789"
1412 elif [ "${type}" = "geneve" ]; then
1413 tun_a="genev_sys_6081"
1416 trace "" "${tun_a}" "${ns_b}" ${type}_b \
1417 "" veth_A-R1 "${ns_r1}" veth_R1-A \
1418 "${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B \
1419 "" ovs_br0 "" veth-A-C \
1422 if [ ${family} -eq 4 ]; then
1424 dst=${tunnel4_b_addr}
1427 dst=${tunnel6_b_addr}
1430 # Create route exception by exceeding link layer MTU
1431 mtu "" veth_A-R1 $((${ll_mtu} + 1000))
1432 mtu "" ovs_br0 $((${ll_mtu} + 1000))
1433 mtu "" veth_A-C $((${ll_mtu} + 1000))
1434 mtu "${ns_c}" veth_C-A $((${ll_mtu} + 1000))
1435 mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000))
1436 mtu "${ns_b}" veth_B-R1 ${ll_mtu}
1437 mtu "${ns_r1}" veth_R1-B ${ll_mtu}
1439 mtu "" ${tun_a} $((${ll_mtu} + 1000))
1440 mtu "${ns_b}" ${type}_b $((${ll_mtu} + 1000))
1442 run_cmd ${ns_c} ${ping} -q -M want -i 0.1 -c 20 -s $((${ll_mtu} + 500)) ${dst} || return 1
1444 # Check that exceptions were created
1445 pmtu="$(route_get_dst_pmtu_from_exception "${ns_c}" ${dst})"
1446 check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on Open vSwitch ${type} interface"
1449 test_pmtu_ipv4_ovs_vxlan4_exception() {
1450 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception vxlan 4 4
1453 test_pmtu_ipv6_ovs_vxlan4_exception() {
1454 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception vxlan 6 4
1457 test_pmtu_ipv4_ovs_geneve4_exception() {
1458 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception geneve 4 4
1461 test_pmtu_ipv6_ovs_geneve4_exception() {
1462 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception geneve 6 4
1465 test_pmtu_ipv4_ovs_vxlan6_exception() {
1466 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception vxlan 4 6
1469 test_pmtu_ipv6_ovs_vxlan6_exception() {
1470 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception vxlan 6 6
1473 test_pmtu_ipv4_ovs_geneve6_exception() {
1474 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception geneve 4 6
1477 test_pmtu_ipv6_ovs_geneve6_exception() {
1478 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception geneve 6 6
1481 test_pmtu_ipvX_over_fouY_or_gueY() {
1487 setup namespaces routing ${encap}${outer_family}${inner_family} || return $ksft_skip
1488 trace "${ns_a}" ${encap}_a "${ns_b}" ${encap}_b \
1489 "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \
1490 "${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B
1492 if [ ${inner_family} -eq 4 ]; then
1494 dst=${tunnel4_b_addr}
1497 dst=${tunnel6_b_addr}
1500 if [ "${encap}" = "gue" ]; then
1506 if [ ${outer_family} -eq 4 ]; then
1507 # IPv4 header UDP header
1508 exp_mtu=$((${ll_mtu} - 20 - 8 - ${encap_overhead}))
1510 # IPv6 header Option 4 UDP header
1511 exp_mtu=$((${ll_mtu} - 40 - 8 - 8 - ${encap_overhead}))
1514 # Create route exception by exceeding link layer MTU
1515 mtu "${ns_a}" veth_A-R1 $((${ll_mtu} + 1000))
1516 mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000))
1517 mtu "${ns_b}" veth_B-R1 ${ll_mtu}
1518 mtu "${ns_r1}" veth_R1-B ${ll_mtu}
1520 mtu "${ns_a}" ${encap}_a $((${ll_mtu} + 1000))
1521 mtu "${ns_b}" ${encap}_b $((${ll_mtu} + 1000))
1522 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${dst}
1524 # Check that exception was created
1525 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst})"
1526 check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on ${encap} interface"
1529 test_pmtu_ipv4_fou4_exception() {
1530 test_pmtu_ipvX_over_fouY_or_gueY 4 4 fou
1533 test_pmtu_ipv6_fou4_exception() {
1534 test_pmtu_ipvX_over_fouY_or_gueY 6 4 fou
1537 test_pmtu_ipv4_fou6_exception() {
1538 test_pmtu_ipvX_over_fouY_or_gueY 4 6 fou
1541 test_pmtu_ipv6_fou6_exception() {
1542 test_pmtu_ipvX_over_fouY_or_gueY 6 6 fou
1545 test_pmtu_ipv4_gue4_exception() {
1546 test_pmtu_ipvX_over_fouY_or_gueY 4 4 gue
1549 test_pmtu_ipv6_gue4_exception() {
1550 test_pmtu_ipvX_over_fouY_or_gueY 6 4 gue
1553 test_pmtu_ipv4_gue6_exception() {
1554 test_pmtu_ipvX_over_fouY_or_gueY 4 6 gue
1557 test_pmtu_ipv6_gue6_exception() {
1558 test_pmtu_ipvX_over_fouY_or_gueY 6 6 gue
1561 test_pmtu_ipvX_over_ipvY_exception() {
1566 setup namespaces routing ip${inner}ip${outer} || return $ksft_skip
1568 trace "${ns_a}" ip_a "${ns_b}" ip_b \
1569 "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \
1570 "${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B
1572 if [ ${inner} -eq 4 ]; then
1574 dst=${tunnel4_b_addr}
1577 dst=${tunnel6_b_addr}
1580 if [ ${outer} -eq 4 ]; then
1582 exp_mtu=$((${ll_mtu} - 20))
1584 # IPv6 header Option 4
1585 exp_mtu=$((${ll_mtu} - 40 - 8))
1588 # Create route exception by exceeding link layer MTU
1589 mtu "${ns_a}" veth_A-R1 $((${ll_mtu} + 1000))
1590 mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000))
1591 mtu "${ns_b}" veth_B-R1 ${ll_mtu}
1592 mtu "${ns_r1}" veth_R1-B ${ll_mtu}
1594 mtu "${ns_a}" ip_a $((${ll_mtu} + 1000)) || return
1595 mtu "${ns_b}" ip_b $((${ll_mtu} + 1000)) || return
1596 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${dst}
1598 # Check that exception was created
1599 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst})"
1600 check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on ip${inner}ip${outer} interface"
1603 test_pmtu_ipv4_ipv4_exception() {
1604 test_pmtu_ipvX_over_ipvY_exception 4 4
1607 test_pmtu_ipv6_ipv4_exception() {
1608 test_pmtu_ipvX_over_ipvY_exception 6 4
1611 test_pmtu_ipv4_ipv6_exception() {
1612 test_pmtu_ipvX_over_ipvY_exception 4 6
1615 test_pmtu_ipv6_ipv6_exception() {
1616 test_pmtu_ipvX_over_ipvY_exception 6 6
1619 test_pmtu_vti4_exception() {
1620 setup namespaces veth vti4 xfrm4 || return $ksft_skip
1621 trace "${ns_a}" veth_a "${ns_b}" veth_b \
1622 "${ns_a}" vti4_a "${ns_b}" vti4_b
1625 vti_mtu=$((veth_mtu - 20))
1627 # SPI SN IV ICV pad length next header
1628 esp_payload_rfc4106=$((vti_mtu - 4 - 4 - 8 - 16 - 1 - 1))
1629 ping_payload=$((esp_payload_rfc4106 - 28))
1631 mtu "${ns_a}" veth_a ${veth_mtu}
1632 mtu "${ns_b}" veth_b ${veth_mtu}
1633 mtu "${ns_a}" vti4_a ${vti_mtu}
1634 mtu "${ns_b}" vti4_b ${vti_mtu}
1636 # Send DF packet without exceeding link layer MTU, check that no
1637 # exception is created
1638 run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s ${ping_payload} ${tunnel4_b_addr}
1639 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel4_b_addr})"
1640 check_pmtu_value "" "${pmtu}" "sending packet smaller than PMTU (IP payload length ${esp_payload_rfc4106})" || return 1
1642 # Now exceed link layer MTU by one byte, check that exception is created
1643 # with the right PMTU value
1644 run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s $((ping_payload + 1)) ${tunnel4_b_addr}
1645 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel4_b_addr})"
1646 check_pmtu_value "${esp_payload_rfc4106}" "${pmtu}" "exceeding PMTU (IP payload length $((esp_payload_rfc4106 + 1)))"
1649 test_pmtu_vti6_exception() {
1650 setup namespaces veth vti6 xfrm6 || return $ksft_skip
1651 trace "${ns_a}" veth_a "${ns_b}" veth_b \
1652 "${ns_a}" vti6_a "${ns_b}" vti6_b
1655 # Create route exception by exceeding link layer MTU
1656 mtu "${ns_a}" veth_a 4000
1657 mtu "${ns_b}" veth_b 4000
1658 mtu "${ns_a}" vti6_a 5000
1659 mtu "${ns_b}" vti6_b 5000
1660 run_cmd ${ns_a} ${ping6} -q -i 0.1 -w 1 -s 60000 ${tunnel6_b_addr}
1662 # Check that exception was created
1663 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})"
1664 check_pmtu_value any "${pmtu}" "creating tunnel exceeding link layer MTU" || return 1
1666 # Decrease tunnel MTU, check for PMTU decrease in route exception
1667 mtu "${ns_a}" vti6_a 3000
1668 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})"
1669 check_pmtu_value "3000" "${pmtu}" "decreasing tunnel MTU" || fail=1
1671 # Increase tunnel MTU, check for PMTU increase in route exception
1672 mtu "${ns_a}" vti6_a 9000
1673 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})"
1674 check_pmtu_value "9000" "${pmtu}" "increasing tunnel MTU" || fail=1
1679 test_pmtu_vti4_udp_exception() {
1680 setup namespaces veth vti4 xfrm4udp || return $ksft_skip
1681 trace "${ns_a}" veth_a "${ns_b}" veth_b \
1682 "${ns_a}" vti4_a "${ns_b}" vti4_b
1685 vti_mtu=$((veth_mtu - 20))
1687 # UDP SPI SN IV ICV pad length next header
1688 esp_payload_rfc4106=$((vti_mtu - 8 - 4 - 4 - 8 - 16 - 1 - 1))
1689 ping_payload=$((esp_payload_rfc4106 - 28))
1691 mtu "${ns_a}" veth_a ${veth_mtu}
1692 mtu "${ns_b}" veth_b ${veth_mtu}
1693 mtu "${ns_a}" vti4_a ${vti_mtu}
1694 mtu "${ns_b}" vti4_b ${vti_mtu}
1696 # Send DF packet without exceeding link layer MTU, check that no
1697 # exception is created
1698 run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s ${ping_payload} ${tunnel4_b_addr}
1699 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel4_b_addr})"
1700 check_pmtu_value "" "${pmtu}" "sending packet smaller than PMTU (IP payload length ${esp_payload_rfc4106})" || return 1
1702 # Now exceed link layer MTU by one byte, check that exception is created
1703 # with the right PMTU value
1704 run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s $((ping_payload + 1)) ${tunnel4_b_addr}
1705 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel4_b_addr})"
1706 check_pmtu_value "${esp_payload_rfc4106}" "${pmtu}" "exceeding PMTU (IP payload length $((esp_payload_rfc4106 + 1)))"
1709 test_pmtu_vti6_udp_exception() {
1710 setup namespaces veth vti6 xfrm6udp || return $ksft_skip
1711 trace "${ns_a}" veth_a "${ns_b}" veth_b \
1712 "${ns_a}" vti6_a "${ns_b}" vti6_b
1715 # Create route exception by exceeding link layer MTU
1716 mtu "${ns_a}" veth_a 4000
1717 mtu "${ns_b}" veth_b 4000
1718 mtu "${ns_a}" vti6_a 5000
1719 mtu "${ns_b}" vti6_b 5000
1720 run_cmd ${ns_a} ${ping6} -q -i 0.1 -w 1 -s 60000 ${tunnel6_b_addr}
1722 # Check that exception was created
1723 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})"
1724 check_pmtu_value any "${pmtu}" "creating tunnel exceeding link layer MTU" || return 1
1726 # Decrease tunnel MTU, check for PMTU decrease in route exception
1727 mtu "${ns_a}" vti6_a 3000
1728 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})"
1729 check_pmtu_value "3000" "${pmtu}" "decreasing tunnel MTU" || fail=1
1731 # Increase tunnel MTU, check for PMTU increase in route exception
1732 mtu "${ns_a}" vti6_a 9000
1733 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})"
1734 check_pmtu_value "9000" "${pmtu}" "increasing tunnel MTU" || fail=1
1739 test_pmtu_vti4_udp_routed_exception() {
1740 setup namespaces routing vti4routed xfrm4udprouted || return $ksft_skip
1741 trace "${ns_a}" veth_A-R1 "${ns_b}" veth_B-R1 \
1742 "${ns_a}" vti4_a "${ns_b}" vti4_b
1745 vti_mtu=$((veth_mtu - 20))
1747 # UDP SPI SN IV ICV pad length next header
1748 esp_payload_rfc4106=$((vti_mtu - 8 - 4 - 4 - 8 - 16 - 1 - 1))
1749 ping_payload=$((esp_payload_rfc4106 - 28))
1751 mtu "${ns_a}" veth_A-R1 ${veth_mtu}
1752 mtu "${ns_r1}" veth_R1-A ${veth_mtu}
1753 mtu "${ns_b}" veth_B-R1 ${veth_mtu}
1754 mtu "${ns_r1}" veth_R1-B ${veth_mtu}
1756 mtu "${ns_a}" vti4_a ${vti_mtu}
1757 mtu "${ns_b}" vti4_b ${vti_mtu}
1759 # Send DF packet without exceeding link layer MTU, check that no
1760 # exception is created
1761 run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s ${ping_payload} ${tunnel4_b_addr}
1762 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel4_b_addr})"
1763 check_pmtu_value "" "${pmtu}" "sending packet smaller than PMTU (IP payload length ${esp_payload_rfc4106})" || return 1
1765 # Now decrease link layer MTU by 8 bytes on R1, check that exception is created
1766 # with the right PMTU value
1767 mtu "${ns_r1}" veth_R1-B $((veth_mtu - 8))
1768 run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s $((ping_payload)) ${tunnel4_b_addr}
1769 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel4_b_addr})"
1770 check_pmtu_value "$((esp_payload_rfc4106 - 8))" "${pmtu}" "exceeding PMTU (IP payload length $((esp_payload_rfc4106)))"
1773 test_pmtu_vti6_udp_routed_exception() {
1774 setup namespaces routing vti6routed xfrm6udprouted || return $ksft_skip
1775 trace "${ns_a}" veth_A-R1 "${ns_b}" veth_B-R1 \
1776 "${ns_a}" vti6_a "${ns_b}" vti6_b
1779 vti_mtu=$((veth_mtu - 40))
1781 # UDP SPI SN IV ICV pad length next header
1782 esp_payload_rfc4106=$((vti_mtu - 8 - 4 - 4 - 8 - 16 - 1 - 1))
1783 ping_payload=$((esp_payload_rfc4106 - 48))
1785 mtu "${ns_a}" veth_A-R1 ${veth_mtu}
1786 mtu "${ns_r1}" veth_R1-A ${veth_mtu}
1787 mtu "${ns_b}" veth_B-R1 ${veth_mtu}
1788 mtu "${ns_r1}" veth_R1-B ${veth_mtu}
1790 # mtu "${ns_a}" vti6_a ${vti_mtu}
1791 # mtu "${ns_b}" vti6_b ${vti_mtu}
1793 run_cmd ${ns_a} ${ping6} -q -M want -i 0.1 -w 1 -s ${ping_payload} ${tunnel6_b_addr}
1795 # Check that exception was not created
1796 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})"
1797 check_pmtu_value "" "${pmtu}" "sending packet smaller than PMTU (IP payload length ${esp_payload_rfc4106})" || return 1
1799 # Now decrease link layer MTU by 8 bytes on R1, check that exception is created
1800 # with the right PMTU value
1801 mtu "${ns_r1}" veth_R1-B $((veth_mtu - 8))
1802 run_cmd ${ns_a} ${ping6} -q -M want -i 0.1 -w 1 -s $((ping_payload)) ${tunnel6_b_addr}
1803 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})"
1804 check_pmtu_value "$((esp_payload_rfc4106 - 8))" "${pmtu}" "exceeding PMTU (IP payload length $((esp_payload_rfc4106)))"
1808 test_pmtu_vti4_default_mtu() {
1809 setup namespaces veth vti4 || return $ksft_skip
1811 # Check that MTU of vti device is MTU of veth minus IPv4 header length
1812 veth_mtu="$(link_get_mtu "${ns_a}" veth_a)"
1813 vti4_mtu="$(link_get_mtu "${ns_a}" vti4_a)"
1814 if [ $((veth_mtu - vti4_mtu)) -ne 20 ]; then
1815 err " vti MTU ${vti4_mtu} is not veth MTU ${veth_mtu} minus IPv4 header length"
1820 test_pmtu_vti6_default_mtu() {
1821 setup namespaces veth vti6 || return $ksft_skip
1823 # Check that MTU of vti device is MTU of veth minus IPv6 header length
1824 veth_mtu="$(link_get_mtu "${ns_a}" veth_a)"
1825 vti6_mtu="$(link_get_mtu "${ns_a}" vti6_a)"
1826 if [ $((veth_mtu - vti6_mtu)) -ne 40 ]; then
1827 err " vti MTU ${vti6_mtu} is not veth MTU ${veth_mtu} minus IPv6 header length"
1832 test_pmtu_vti4_link_add_mtu() {
1833 setup namespaces || return $ksft_skip
1835 run_cmd ${ns_a} ip link add vti4_a type vti local ${veth4_a_addr} remote ${veth4_b_addr} key 10
1836 [ $? -ne 0 ] && err " vti not supported" && return $ksft_skip
1837 run_cmd ${ns_a} ip link del vti4_a
1843 # Check invalid values first
1844 for v in $((min - 1)) $((max + 1)); do
1845 run_cmd ${ns_a} ip link add vti4_a mtu ${v} type vti local ${veth4_a_addr} remote ${veth4_b_addr} key 10
1846 # This can fail, or MTU can be adjusted to a proper value
1847 [ $? -ne 0 ] && continue
1848 mtu="$(link_get_mtu "${ns_a}" vti4_a)"
1849 if [ ${mtu} -lt ${min} -o ${mtu} -gt ${max} ]; then
1850 err " vti tunnel created with invalid MTU ${mtu}"
1853 run_cmd ${ns_a} ip link del vti4_a
1856 # Now check valid values
1857 for v in ${min} 1300 ${max}; do
1858 run_cmd ${ns_a} ip link add vti4_a mtu ${v} type vti local ${veth4_a_addr} remote ${veth4_b_addr} key 10
1859 mtu="$(link_get_mtu "${ns_a}" vti4_a)"
1860 run_cmd ${ns_a} ip link del vti4_a
1861 if [ "${mtu}" != "${v}" ]; then
1862 err " vti MTU ${mtu} doesn't match configured value ${v}"
1870 test_pmtu_vti6_link_add_mtu() {
1871 setup namespaces || return $ksft_skip
1873 run_cmd ${ns_a} ip link add vti6_a type vti6 local ${veth6_a_addr} remote ${veth6_b_addr} key 10
1874 [ $? -ne 0 ] && err " vti6 not supported" && return $ksft_skip
1875 run_cmd ${ns_a} ip link del vti6_a
1879 min=68 # vti6 can carry IPv4 packets too
1881 # Check invalid values first
1882 for v in $((min - 1)) $((max + 1)); do
1883 run_cmd ${ns_a} ip link add vti6_a mtu ${v} type vti6 local ${veth6_a_addr} remote ${veth6_b_addr} key 10
1884 # This can fail, or MTU can be adjusted to a proper value
1885 [ $? -ne 0 ] && continue
1886 mtu="$(link_get_mtu "${ns_a}" vti6_a)"
1887 if [ ${mtu} -lt ${min} -o ${mtu} -gt ${max} ]; then
1888 err " vti6 tunnel created with invalid MTU ${v}"
1891 run_cmd ${ns_a} ip link del vti6_a
1894 # Now check valid values
1895 for v in 68 1280 1300 $((65535 - 40)); do
1896 run_cmd ${ns_a} ip link add vti6_a mtu ${v} type vti6 local ${veth6_a_addr} remote ${veth6_b_addr} key 10
1897 mtu="$(link_get_mtu "${ns_a}" vti6_a)"
1898 run_cmd ${ns_a} ip link del vti6_a
1899 if [ "${mtu}" != "${v}" ]; then
1900 err " vti6 MTU ${mtu} doesn't match configured value ${v}"
1908 test_pmtu_vti6_link_change_mtu() {
1909 setup namespaces || return $ksft_skip
1911 run_cmd ${ns_a} ip link add dummy0 mtu 1500 type dummy
1912 [ $? -ne 0 ] && err " dummy not supported" && return $ksft_skip
1913 run_cmd ${ns_a} ip link add dummy1 mtu 3000 type dummy
1914 run_cmd ${ns_a} ip link set dummy0 up
1915 run_cmd ${ns_a} ip link set dummy1 up
1917 run_cmd ${ns_a} ip addr add ${dummy6_0_prefix}1/${dummy6_mask} dev dummy0
1918 run_cmd ${ns_a} ip addr add ${dummy6_1_prefix}1/${dummy6_mask} dev dummy1
1922 # Create vti6 interface bound to device, passing MTU, check it
1923 run_cmd ${ns_a} ip link add vti6_a mtu 1300 type vti6 remote ${dummy6_0_prefix}2 local ${dummy6_0_prefix}1
1924 mtu="$(link_get_mtu "${ns_a}" vti6_a)"
1925 if [ ${mtu} -ne 1300 ]; then
1926 err " vti6 MTU ${mtu} doesn't match configured value 1300"
1930 # Move to another device with different MTU, without passing MTU, check
1932 run_cmd ${ns_a} ip link set vti6_a type vti6 remote ${dummy6_1_prefix}2 local ${dummy6_1_prefix}1
1933 mtu="$(link_get_mtu "${ns_a}" vti6_a)"
1934 if [ ${mtu} -ne $((3000 - 40)) ]; then
1935 err " vti MTU ${mtu} is not dummy MTU 3000 minus IPv6 header length"
1939 # Move it back, passing MTU, check MTU is not overridden
1940 run_cmd ${ns_a} ip link set vti6_a mtu 1280 type vti6 remote ${dummy6_0_prefix}2 local ${dummy6_0_prefix}1
1941 mtu="$(link_get_mtu "${ns_a}" vti6_a)"
1942 if [ ${mtu} -ne 1280 ]; then
1943 err " vti6 MTU ${mtu} doesn't match configured value 1280"
1953 if ! which ${cmd} > /dev/null 2>&1; then
1954 err " missing required command: '${cmd}'"
1964 [ "$(cat /proc/${pid}/cmdline 2>/dev/null | tr -d '\0')" = "{cmd}" ]
1967 test_cleanup_vxlanX_exception() {
1972 check_command taskset || return $ksft_skip
1973 cpu_list=$(grep -m 2 processor /proc/cpuinfo | cut -d ' ' -f 2)
1975 setup namespaces routing ${encap}${outer} || return $ksft_skip
1976 trace "${ns_a}" ${encap}_a "${ns_b}" ${encap}_b \
1977 "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \
1978 "${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B
1980 # Create route exception by exceeding link layer MTU
1981 mtu "${ns_a}" veth_A-R1 $((${ll_mtu} + 1000))
1982 mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000))
1983 mtu "${ns_b}" veth_B-R1 ${ll_mtu}
1984 mtu "${ns_r1}" veth_R1-B ${ll_mtu}
1986 mtu "${ns_a}" ${encap}_a $((${ll_mtu} + 1000))
1987 mtu "${ns_b}" ${encap}_b $((${ll_mtu} + 1000))
1989 # Fill exception cache for multiple CPUs (2)
1990 # we can always use inner IPv4 for that
1991 for cpu in ${cpu_list}; do
1992 run_cmd taskset --cpu-list ${cpu} ${ns_a} ping -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${tunnel4_b_addr}
1995 ${ns_a} ip link del dev veth_A-R1 &
1997 for i in $(seq 1 20); do
1998 check_running ${iplink_pid} "iplinkdeldevveth_A-R1" || return 0
2001 err " can't delete veth device in a timely manner, PMTU dst likely leaked"
2005 test_cleanup_ipv6_exception() {
2006 test_cleanup_vxlanX_exception 6
2009 test_cleanup_ipv4_exception() {
2010 test_cleanup_vxlanX_exception 4
2020 # Since cleanup() relies on variables modified by this subshell, it
2021 # has to run in this context.
2024 if [ "$VERBOSE" = "1" ]; then
2025 printf "\n##########################################################################\n\n"
2031 if [ $ret -eq 0 ]; then
2032 printf "TEST: %-60s [ OK ]\n" "${tdesc}"
2033 elif [ $ret -eq 1 ]; then
2034 printf "TEST: %-60s [FAIL]\n" "${tdesc}"
2035 if [ "${PAUSE_ON_FAIL}" = "yes" ]; then
2037 echo "Pausing. Hit enter to continue"
2042 elif [ $ret -eq $ksft_skip ]; then
2043 printf "TEST: %-60s [SKIP]\n" "${tdesc}"
2053 [ $exitcode -eq $ksft_skip ] && exitcode=0
2056 [ $all_skipped = true ] && exitcode=$ksft_skip
2072 run_test "${tname}" "${tdesc} - nexthop objects"
2076 test_list_flush_ipv4_exception() {
2077 setup namespaces routing || return $ksft_skip
2078 trace "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \
2079 "${ns_r1}" veth_R1-B "${ns_b}" veth_B-R1 \
2080 "${ns_a}" veth_A-R2 "${ns_r2}" veth_R2-A \
2081 "${ns_r2}" veth_R2-B "${ns_b}" veth_B-R2
2083 dst_prefix1="${prefix4}.${b_r1}."
2084 dst2="${prefix4}.${b_r2}.1"
2086 # Set up initial MTU values
2087 mtu "${ns_a}" veth_A-R1 2000
2088 mtu "${ns_r1}" veth_R1-A 2000
2089 mtu "${ns_r1}" veth_R1-B 1500
2090 mtu "${ns_b}" veth_B-R1 1500
2092 mtu "${ns_a}" veth_A-R2 2000
2093 mtu "${ns_r2}" veth_R2-A 2000
2094 mtu "${ns_r2}" veth_R2-B 1500
2095 mtu "${ns_b}" veth_B-R2 1500
2099 # Add 100 addresses for veth endpoint on B reached by default A route
2100 for i in $(seq 100 199); do
2101 run_cmd ${ns_b} ip addr add "${dst_prefix1}${i}" dev veth_B-R1
2104 # Create 100 cached route exceptions for path via R1, one via R2. Note
2105 # that with IPv4 we need to actually cause a route lookup that matches
2106 # the exception caused by ICMP, in order to actually have a cached
2107 # route, so we need to ping each destination twice
2108 for i in $(seq 100 199); do
2109 run_cmd ${ns_a} ping -q -M want -i 0.1 -c 2 -s 1800 "${dst_prefix1}${i}"
2111 run_cmd ${ns_a} ping -q -M want -i 0.1 -c 2 -s 1800 "${dst2}"
2113 if [ "$(${ns_a} ip -oneline route list cache | wc -l)" -ne 101 ]; then
2114 err " can't list cached exceptions"
2118 run_cmd ${ns_a} ip route flush cache
2119 pmtu1="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst_prefix}1)"
2120 pmtu2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst_prefix}2)"
2121 if [ -n "${pmtu1}" ] || [ -n "${pmtu2}" ] || \
2122 [ -n "$(${ns_a} ip route list cache)" ]; then
2123 err " can't flush cached exceptions"
2130 test_list_flush_ipv6_exception() {
2131 setup namespaces routing || return $ksft_skip
2132 trace "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \
2133 "${ns_r1}" veth_R1-B "${ns_b}" veth_B-R1 \
2134 "${ns_a}" veth_A-R2 "${ns_r2}" veth_R2-A \
2135 "${ns_r2}" veth_R2-B "${ns_b}" veth_B-R2
2137 dst_prefix1="${prefix6}:${b_r1}::"
2138 dst2="${prefix6}:${b_r2}::1"
2140 # Set up initial MTU values
2141 mtu "${ns_a}" veth_A-R1 2000
2142 mtu "${ns_r1}" veth_R1-A 2000
2143 mtu "${ns_r1}" veth_R1-B 1500
2144 mtu "${ns_b}" veth_B-R1 1500
2146 mtu "${ns_a}" veth_A-R2 2000
2147 mtu "${ns_r2}" veth_R2-A 2000
2148 mtu "${ns_r2}" veth_R2-B 1500
2149 mtu "${ns_b}" veth_B-R2 1500
2153 # Add 100 addresses for veth endpoint on B reached by default A route
2154 for i in $(seq 100 199); do
2155 run_cmd ${ns_b} ip addr add "${dst_prefix1}${i}" dev veth_B-R1
2158 # Create 100 cached route exceptions for path via R1, one via R2
2159 for i in $(seq 100 199); do
2160 run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s 1800 "${dst_prefix1}${i}"
2162 run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s 1800 "${dst2}"
2163 if [ "$(${ns_a} ip -oneline -6 route list cache | wc -l)" -ne 101 ]; then
2164 err " can't list cached exceptions"
2168 run_cmd ${ns_a} ip -6 route flush cache
2169 pmtu1="$(route_get_dst_pmtu_from_exception "${ns_a}" "${dst_prefix1}100")"
2170 pmtu2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})"
2171 if [ -n "${pmtu1}" ] || [ -n "${pmtu2}" ] || \
2172 [ -n "$(${ns_a} ip -6 route list cache)" ]; then
2173 err " can't flush cached exceptions"
2180 test_pmtu_ipvX_route_change() {
2183 setup namespaces routing || return 2
2184 trace "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \
2185 "${ns_r1}" veth_R1-B "${ns_b}" veth_B-R1 \
2186 "${ns_a}" veth_A-R2 "${ns_r2}" veth_R2-A \
2187 "${ns_r2}" veth_R2-B "${ns_b}" veth_B-R2
2189 if [ ${family} -eq 4 ]; then
2191 dst1="${prefix4}.${b_r1}.1"
2192 dst2="${prefix4}.${b_r2}.1"
2193 gw="${prefix4}.${a_r1}.2"
2196 dst1="${prefix6}:${b_r1}::1"
2197 dst2="${prefix6}:${b_r2}::1"
2198 gw="${prefix6}:${a_r1}::2"
2201 # Set up initial MTU values
2202 mtu "${ns_a}" veth_A-R1 2000
2203 mtu "${ns_r1}" veth_R1-A 2000
2204 mtu "${ns_r1}" veth_R1-B 1400
2205 mtu "${ns_b}" veth_B-R1 1400
2207 mtu "${ns_a}" veth_A-R2 2000
2208 mtu "${ns_r2}" veth_R2-A 2000
2209 mtu "${ns_r2}" veth_R2-B 1500
2210 mtu "${ns_b}" veth_B-R2 1500
2212 # Create route exceptions
2213 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1800 ${dst1}
2214 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1800 ${dst2}
2216 # Check that exceptions have been created with the correct PMTU
2217 pmtu_1="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst1})"
2218 check_pmtu_value "1400" "${pmtu_1}" "exceeding MTU" || return 1
2219 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})"
2220 check_pmtu_value "1500" "${pmtu_2}" "exceeding MTU" || return 1
2222 # Replace the route from A to R1
2223 run_cmd ${ns_a} ip route change default via ${gw}
2225 # Delete the device in A
2226 run_cmd ${ns_a} ip link del "veth_A-R1"
2229 test_pmtu_ipv4_route_change() {
2230 test_pmtu_ipvX_route_change 4
2233 test_pmtu_ipv6_route_change() {
2234 test_pmtu_ipvX_route_change 6
2239 echo "$0 [OPTIONS] [TEST]..."
2240 echo "If no TEST argument is given, all tests will be run."
2243 echo " --trace: capture traffic to TEST_INTERFACE.pcap"
2245 echo "Available tests${tests}"
2249 ################################################################################
2255 while getopts :ptv o
2258 p) PAUSE_ON_FAIL=yes;;
2260 t) if which tcpdump > /dev/null 2>&1; then
2263 echo "=== tcpdump not available, tracing disabled"
2269 shift $(($OPTIND-1))
2275 # Check first that all requested tests are available before running any
2276 command -v > /dev/null "test_${arg}" || { echo "=== Test ${arg} not found"; usage; }
2285 ip nexthop ls >/dev/null 2>&1
2286 [ $? -eq 0 ] && HAVE_NH=yes
2291 for t in ${tests}; do
2292 [ "${name}" = "" ] && name="${t}" && continue
2293 [ "${desc}" = "" ] && desc="${t}" && continue
2295 if [ "${HAVE_NH}" = "yes" ]; then
2301 [ "${arg}" != "${arg#--*}" ] && continue
2302 [ "${arg}" = "${name}" ] && run_this=1 && break
2305 if [ $run_this -eq 1 ]; then
2306 run_test "${name}" "${desc}"
2307 # if test was skipped no need to retry with nexthop objects
2308 [ $? -eq $ksft_skip ] && rerun_nh=0
2310 if [ "${rerun_nh}" = "1" ]; then
2311 run_test_nh "${name}" "${desc}"