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1#!/bin/sh
2# SPDX-License-Identifier: GPL-2.0
3#
4# Check that route PMTU values match expectations, and that initial device MTU
5# values are assigned correctly
6#
7# Tests currently implemented:
8#
9# - pmtu_ipv4
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:
12#
13# segment a_r1 segment b_r1 a_r1: 2000
14# .--------------R1--------------. b_r1: 1400
15# A B a_r2: 2000
16# '--------------R2--------------' b_r2: 1500
17# segment a_r2 segment b_r2
18#
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
24# received
25#
26# - pmtu_ipv6
27# Same as pmtu_ipv4, except for locked PMTU tests, using IPv6
28#
29# - pmtu_ipv4_vxlan4_exception
30# Set up the same network topology as pmtu_ipv4, create a VXLAN tunnel
31# over IPv4 between A and B, routed via R1. On the link between R1 and B,
32# set a MTU lower than the VXLAN MTU and the MTU on the link between A and
33# R1. Send IPv4 packets, exceeding the MTU between R1 and B, over VXLAN
34# from A to B and check that the PMTU exception is created with the right
35# value on A
36#
37# - pmtu_ipv6_vxlan4_exception
38# Same as pmtu_ipv4_vxlan4_exception, but send IPv6 packets from A to B
39#
40# - pmtu_ipv4_vxlan6_exception
41# Same as pmtu_ipv4_vxlan4_exception, but use IPv6 transport from A to B
42#
43# - pmtu_ipv6_vxlan6_exception
44# Same as pmtu_ipv4_vxlan6_exception, but send IPv6 packets from A to B
45#
46# - pmtu_ipv4_geneve4_exception
47# Same as pmtu_ipv4_vxlan4_exception, but using a GENEVE tunnel instead of
48# VXLAN
49#
50# - pmtu_ipv6_geneve4_exception
51# Same as pmtu_ipv6_vxlan4_exception, but using a GENEVE tunnel instead of
52# VXLAN
53#
54# - pmtu_ipv4_geneve6_exception
55# Same as pmtu_ipv4_vxlan6_exception, but using a GENEVE tunnel instead of
56# VXLAN
57#
58# - pmtu_ipv6_geneve6_exception
59# Same as pmtu_ipv6_vxlan6_exception, but using a GENEVE tunnel instead of
60# VXLAN
61#
62# - pmtu_ipv{4,6}_br_vxlan{4,6}_exception
63# Set up three namespaces, A, B, and C, with routing between A and B over
64# R1. R2 is unused in these tests. A has a veth connection to C, and is
65# connected to B via a VXLAN endpoint, which is directly bridged to C.
66# MTU on the B-R1 link is lower than other MTUs.
67#
68# Check that both C and A are able to communicate with B over the VXLAN
69# tunnel, and that PMTU exceptions with the correct values are created.
70#
71# segment a_r1 segment b_r1 b_r1: 4000
72# .--------------R1--------------. everything
73# C---veth A B else: 5000
74# ' bridge |
75# '---- - - - - - VXLAN - - - - - - - '
76#
77# - pmtu_ipv{4,6}_br_geneve{4,6}_exception
78# Same as pmtu_ipv{4,6}_br_vxlan{4,6}_exception, with a GENEVE tunnel
79# instead.
80#
81# - pmtu_ipv{4,6}_ovs_vxlan{4,6}_exception
82# Set up two namespaces, B, and C, with routing between the init namespace
83# and B over R1. A and R2 are unused in these tests. The init namespace
84# has a veth connection to C, and is connected to B via a VXLAN endpoint,
85# which is handled by Open vSwitch and bridged to C. MTU on the B-R1 link
86# is lower than other MTUs.
87#
88# Check that C is able to communicate with B over the VXLAN tunnel, and
89# that PMTU exceptions with the correct values are created.
90#
91# segment a_r1 segment b_r1 b_r1: 4000
92# .--------------R1--------------. everything
93# C---veth init B else: 5000
94# '- ovs |
95# '---- - - - - - VXLAN - - - - - - - '
96#
97# - pmtu_ipv{4,6}_ovs_geneve{4,6}_exception
98# Same as pmtu_ipv{4,6}_ovs_vxlan{4,6}_exception, with a GENEVE tunnel
99# instead.
100#
101# - pmtu_ipv{4,6}_fou{4,6}_exception
102# Same as pmtu_ipv4_vxlan4, but using a direct IPv4/IPv6 encapsulation
103# (FoU) over IPv4/IPv6, instead of VXLAN
104#
105# - pmtu_ipv{4,6}_fou{4,6}_exception
106# Same as pmtu_ipv4_vxlan4, but using a generic UDP IPv4/IPv6
107# encapsulation (GUE) over IPv4/IPv6, instead of VXLAN
108#
109# - pmtu_ipv{4,6}_ipv{4,6}_exception
110# Same as pmtu_ipv4_vxlan4, but using a IPv4/IPv6 tunnel over IPv4/IPv6,
111# instead of VXLAN
112#
113# - pmtu_vti4_exception
114# Set up vti tunnel on top of veth, with xfrm states and policies, in two
115# namespaces with matching endpoints. Check that route exception is not
116# created if link layer MTU is not exceeded, then exceed it and check that
117# exception is created with the expected PMTU. The approach described
118# below for IPv6 doesn't apply here, because, on IPv4, administrative MTU
119# changes alone won't affect PMTU
120#
121# - pmtu_vti6_exception
122# Set up vti6 tunnel on top of veth, with xfrm states and policies, in two
123# namespaces with matching endpoints. Check that route exception is
124# created by exceeding link layer MTU with ping to other endpoint. Then
125# decrease and increase MTU of tunnel, checking that route exception PMTU
126# changes accordingly
127#
128# - pmtu_vti4_default_mtu
129# Set up vti4 tunnel on top of veth, in two namespaces with matching
130# endpoints. Check that MTU assigned to vti interface is the MTU of the
131# lower layer (veth) minus additional lower layer headers (zero, for veth)
132# minus IPv4 header length
133#
134# - pmtu_vti6_default_mtu
135# Same as above, for IPv6
136#
137# - pmtu_vti4_link_add_mtu
138# Set up vti4 interface passing MTU value at link creation, check MTU is
139# configured, and that link is not created with invalid MTU values
140#
141# - pmtu_vti6_link_add_mtu
142# Same as above, for IPv6
143#
144# - pmtu_vti6_link_change_mtu
145# Set up two dummy interfaces with different MTUs, create a vti6 tunnel
146# and check that configured MTU is used on link creation and changes, and
147# that MTU is properly calculated instead when MTU is not configured from
148# userspace
149#
150# - cleanup_ipv4_exception
151# Similar to pmtu_ipv4_vxlan4_exception, but explicitly generate PMTU
152# exceptions on multiple CPUs and check that the veth device tear-down
153# happens in a timely manner
154#
155# - cleanup_ipv6_exception
156# Same as above, but use IPv6 transport from A to B
157#
158# - list_flush_ipv4_exception
159# Using the same topology as in pmtu_ipv4, create exceptions, and check
160# they are shown when listing exception caches, gone after flushing them
161#
162# - list_flush_ipv6_exception
163# Using the same topology as in pmtu_ipv6, create exceptions, and check
164# they are shown when listing exception caches, gone after flushing them
165
166
167# Kselftest framework requirement - SKIP code is 4.
168ksft_skip=4
169
170PAUSE_ON_FAIL=no
171VERBOSE=0
172TRACING=0
173
174# Some systems don't have a ping6 binary anymore
175which ping6 > /dev/null 2>&1 && ping6=$(which ping6) || ping6=$(which ping)
176
177# Name Description re-run with nh
178tests="
179 pmtu_ipv4_exception ipv4: PMTU exceptions 1
180 pmtu_ipv6_exception ipv6: PMTU exceptions 1
181 pmtu_ipv4_vxlan4_exception IPv4 over vxlan4: PMTU exceptions 1
182 pmtu_ipv6_vxlan4_exception IPv6 over vxlan4: PMTU exceptions 1
183 pmtu_ipv4_vxlan6_exception IPv4 over vxlan6: PMTU exceptions 1
184 pmtu_ipv6_vxlan6_exception IPv6 over vxlan6: PMTU exceptions 1
185 pmtu_ipv4_geneve4_exception IPv4 over geneve4: PMTU exceptions 1
186 pmtu_ipv6_geneve4_exception IPv6 over geneve4: PMTU exceptions 1
187 pmtu_ipv4_geneve6_exception IPv4 over geneve6: PMTU exceptions 1
188 pmtu_ipv6_geneve6_exception IPv6 over geneve6: PMTU exceptions 1
189 pmtu_ipv4_br_vxlan4_exception IPv4, bridged vxlan4: PMTU exceptions 1
190 pmtu_ipv6_br_vxlan4_exception IPv6, bridged vxlan4: PMTU exceptions 1
191 pmtu_ipv4_br_vxlan6_exception IPv4, bridged vxlan6: PMTU exceptions 1
192 pmtu_ipv6_br_vxlan6_exception IPv6, bridged vxlan6: PMTU exceptions 1
193 pmtu_ipv4_br_geneve4_exception IPv4, bridged geneve4: PMTU exceptions 1
194 pmtu_ipv6_br_geneve4_exception IPv6, bridged geneve4: PMTU exceptions 1
195 pmtu_ipv4_br_geneve6_exception IPv4, bridged geneve6: PMTU exceptions 1
196 pmtu_ipv6_br_geneve6_exception IPv6, bridged geneve6: PMTU exceptions 1
197 pmtu_ipv4_ovs_vxlan4_exception IPv4, OVS vxlan4: PMTU exceptions 1
198 pmtu_ipv6_ovs_vxlan4_exception IPv6, OVS vxlan4: PMTU exceptions 1
199 pmtu_ipv4_ovs_vxlan6_exception IPv4, OVS vxlan6: PMTU exceptions 1
200 pmtu_ipv6_ovs_vxlan6_exception IPv6, OVS vxlan6: PMTU exceptions 1
201 pmtu_ipv4_ovs_geneve4_exception IPv4, OVS geneve4: PMTU exceptions 1
202 pmtu_ipv6_ovs_geneve4_exception IPv6, OVS geneve4: PMTU exceptions 1
203 pmtu_ipv4_ovs_geneve6_exception IPv4, OVS geneve6: PMTU exceptions 1
204 pmtu_ipv6_ovs_geneve6_exception IPv6, OVS geneve6: PMTU exceptions 1
205 pmtu_ipv4_fou4_exception IPv4 over fou4: PMTU exceptions 1
206 pmtu_ipv6_fou4_exception IPv6 over fou4: PMTU exceptions 1
207 pmtu_ipv4_fou6_exception IPv4 over fou6: PMTU exceptions 1
208 pmtu_ipv6_fou6_exception IPv6 over fou6: PMTU exceptions 1
209 pmtu_ipv4_gue4_exception IPv4 over gue4: PMTU exceptions 1
210 pmtu_ipv6_gue4_exception IPv6 over gue4: PMTU exceptions 1
211 pmtu_ipv4_gue6_exception IPv4 over gue6: PMTU exceptions 1
212 pmtu_ipv6_gue6_exception IPv6 over gue6: PMTU exceptions 1
213 pmtu_ipv4_ipv4_exception IPv4 over IPv4: PMTU exceptions 1
214 pmtu_ipv6_ipv4_exception IPv6 over IPv4: PMTU exceptions 1
215 pmtu_ipv4_ipv6_exception IPv4 over IPv6: PMTU exceptions 1
216 pmtu_ipv6_ipv6_exception IPv6 over IPv6: PMTU exceptions 1
217 pmtu_vti6_exception vti6: PMTU exceptions 0
218 pmtu_vti4_exception vti4: PMTU exceptions 0
219 pmtu_vti4_default_mtu vti4: default MTU assignment 0
220 pmtu_vti6_default_mtu vti6: default MTU assignment 0
221 pmtu_vti4_link_add_mtu vti4: MTU setting on link creation 0
222 pmtu_vti6_link_add_mtu vti6: MTU setting on link creation 0
223 pmtu_vti6_link_change_mtu vti6: MTU changes on link changes 0
224 cleanup_ipv4_exception ipv4: cleanup of cached exceptions 1
225 cleanup_ipv6_exception ipv6: cleanup of cached exceptions 1
226 list_flush_ipv4_exception ipv4: list and flush cached exceptions 1
227 list_flush_ipv6_exception ipv6: list and flush cached exceptions 1"
228
229NS_A="ns-A"
230NS_B="ns-B"
231NS_C="ns-C"
232NS_R1="ns-R1"
233NS_R2="ns-R2"
234ns_a="ip netns exec ${NS_A}"
235ns_b="ip netns exec ${NS_B}"
236ns_c="ip netns exec ${NS_C}"
237ns_r1="ip netns exec ${NS_R1}"
238ns_r2="ip netns exec ${NS_R2}"
239
240# Addressing and routing for tests with routers: four network segments, with
241# index SEGMENT between 1 and 4, a common prefix (PREFIX4 or PREFIX6) and an
242# identifier ID, which is 1 for hosts (A and B), 2 for routers (R1 and R2).
243# Addresses are:
244# - IPv4: PREFIX4.SEGMENT.ID (/24)
245# - IPv6: PREFIX6:SEGMENT::ID (/64)
246prefix4="10.0"
247prefix6="fc00"
248a_r1=1
249a_r2=2
250b_r1=3
251b_r2=4
252# ns peer segment
253routing_addrs="
254 A R1 ${a_r1}
255 A R2 ${a_r2}
256 B R1 ${b_r1}
257 B R2 ${b_r2}
258"
259# Traffic from A to B goes through R1 by default, and through R2, if destined to
260# B's address on the b_r2 segment.
261# Traffic from B to A goes through R1.
262# ns destination gateway
263routes="
264 A default ${prefix4}.${a_r1}.2
265 A ${prefix4}.${b_r2}.1 ${prefix4}.${a_r2}.2
266 B default ${prefix4}.${b_r1}.2
267
268 A default ${prefix6}:${a_r1}::2
269 A ${prefix6}:${b_r2}::1 ${prefix6}:${a_r2}::2
270 B default ${prefix6}:${b_r1}::2
271"
272
273USE_NH="no"
274# ns family nh id destination gateway
275nexthops="
276 A 4 41 ${prefix4}.${a_r1}.2 veth_A-R1
277 A 4 42 ${prefix4}.${a_r2}.2 veth_A-R2
278 B 4 41 ${prefix4}.${b_r1}.2 veth_B-R1
279
280 A 6 61 ${prefix6}:${a_r1}::2 veth_A-R1
281 A 6 62 ${prefix6}:${a_r2}::2 veth_A-R2
282 B 6 61 ${prefix6}:${b_r1}::2 veth_B-R1
283"
284
285# nexthop id correlates to id in nexthops config above
286# ns family prefix nh id
287routes_nh="
288 A 4 default 41
289 A 4 ${prefix4}.${b_r2}.1 42
290 B 4 default 41
291
292 A 6 default 61
293 A 6 ${prefix6}:${b_r2}::1 62
294 B 6 default 61
295"
296
297veth4_a_addr="192.168.1.1"
298veth4_b_addr="192.168.1.2"
299veth4_c_addr="192.168.2.10"
300veth4_mask="24"
301veth6_a_addr="fd00:1::a"
302veth6_b_addr="fd00:1::b"
303veth6_c_addr="fd00:2::c"
304veth6_mask="64"
305
306tunnel4_a_addr="192.168.2.1"
307tunnel4_b_addr="192.168.2.2"
308tunnel4_mask="24"
309tunnel6_a_addr="fd00:2::a"
310tunnel6_b_addr="fd00:2::b"
311tunnel6_mask="64"
312
313dummy6_0_prefix="fc00:1000::"
314dummy6_1_prefix="fc00:1001::"
315dummy6_mask="64"
316
317err_buf=
318tcpdump_pids=
319
320err() {
321 err_buf="${err_buf}${1}
322"
323}
324
325err_flush() {
326 echo -n "${err_buf}"
327 err_buf=
328}
329
330run_cmd() {
331 cmd="$*"
332
333 if [ "$VERBOSE" = "1" ]; then
334 printf " COMMAND: $cmd\n"
335 fi
336
337 out="$($cmd 2>&1)"
338 rc=$?
339 if [ "$VERBOSE" = "1" -a -n "$out" ]; then
340 echo " $out"
341 echo
342 fi
343
344 return $rc
345}
346
347# Find the auto-generated name for this namespace
348nsname() {
349 eval echo \$NS_$1
350}
351
352setup_fou_or_gue() {
353 outer="${1}"
354 inner="${2}"
355 encap="${3}"
356
357 if [ "${outer}" = "4" ]; then
358 modprobe fou || return 2
359 a_addr="${prefix4}.${a_r1}.1"
360 b_addr="${prefix4}.${b_r1}.1"
361 if [ "${inner}" = "4" ]; then
362 type="ipip"
363 ipproto="4"
364 else
365 type="sit"
366 ipproto="41"
367 fi
368 else
369 modprobe fou6 || return 2
370 a_addr="${prefix6}:${a_r1}::1"
371 b_addr="${prefix6}:${b_r1}::1"
372 if [ "${inner}" = "4" ]; then
373 type="ip6tnl"
374 mode="mode ipip6"
375 ipproto="4 -6"
376 else
377 type="ip6tnl"
378 mode="mode ip6ip6"
379 ipproto="41 -6"
380 fi
381 fi
382
383 run_cmd ${ns_a} ip fou add port 5555 ipproto ${ipproto} || return 2
384 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 2
385
386 run_cmd ${ns_b} ip fou add port 5556 ipproto ${ipproto}
387 run_cmd ${ns_b} ip link add ${encap}_b type ${type} ${mode} local ${b_addr} remote ${a_addr} encap ${encap} encap-sport auto encap-dport 5555
388
389 if [ "${inner}" = "4" ]; then
390 run_cmd ${ns_a} ip addr add ${tunnel4_a_addr}/${tunnel4_mask} dev ${encap}_a
391 run_cmd ${ns_b} ip addr add ${tunnel4_b_addr}/${tunnel4_mask} dev ${encap}_b
392 else
393 run_cmd ${ns_a} ip addr add ${tunnel6_a_addr}/${tunnel6_mask} dev ${encap}_a
394 run_cmd ${ns_b} ip addr add ${tunnel6_b_addr}/${tunnel6_mask} dev ${encap}_b
395 fi
396
397 run_cmd ${ns_a} ip link set ${encap}_a up
398 run_cmd ${ns_b} ip link set ${encap}_b up
399}
400
401setup_fou44() {
402 setup_fou_or_gue 4 4 fou
403}
404
405setup_fou46() {
406 setup_fou_or_gue 4 6 fou
407}
408
409setup_fou64() {
410 setup_fou_or_gue 6 4 fou
411}
412
413setup_fou66() {
414 setup_fou_or_gue 6 6 fou
415}
416
417setup_gue44() {
418 setup_fou_or_gue 4 4 gue
419}
420
421setup_gue46() {
422 setup_fou_or_gue 4 6 gue
423}
424
425setup_gue64() {
426 setup_fou_or_gue 6 4 gue
427}
428
429setup_gue66() {
430 setup_fou_or_gue 6 6 gue
431}
432
433setup_ipvX_over_ipvY() {
434 inner=${1}
435 outer=${2}
436
437 if [ "${outer}" -eq 4 ]; then
438 a_addr="${prefix4}.${a_r1}.1"
439 b_addr="${prefix4}.${b_r1}.1"
440 if [ "${inner}" -eq 4 ]; then
441 type="ipip"
442 mode="ipip"
443 else
444 type="sit"
445 mode="ip6ip"
446 fi
447 else
448 a_addr="${prefix6}:${a_r1}::1"
449 b_addr="${prefix6}:${b_r1}::1"
450 type="ip6tnl"
451 if [ "${inner}" -eq 4 ]; then
452 mode="ipip6"
453 else
454 mode="ip6ip6"
455 fi
456 fi
457
458 run_cmd ${ns_a} ip link add ip_a type ${type} local ${a_addr} remote ${b_addr} mode ${mode} || return 2
459 run_cmd ${ns_b} ip link add ip_b type ${type} local ${b_addr} remote ${a_addr} mode ${mode}
460
461 run_cmd ${ns_a} ip link set ip_a up
462 run_cmd ${ns_b} ip link set ip_b up
463
464 if [ "${inner}" = "4" ]; then
465 run_cmd ${ns_a} ip addr add ${tunnel4_a_addr}/${tunnel4_mask} dev ip_a
466 run_cmd ${ns_b} ip addr add ${tunnel4_b_addr}/${tunnel4_mask} dev ip_b
467 else
468 run_cmd ${ns_a} ip addr add ${tunnel6_a_addr}/${tunnel6_mask} dev ip_a
469 run_cmd ${ns_b} ip addr add ${tunnel6_b_addr}/${tunnel6_mask} dev ip_b
470 fi
471}
472
473setup_ip4ip4() {
474 setup_ipvX_over_ipvY 4 4
475}
476
477setup_ip6ip4() {
478 setup_ipvX_over_ipvY 6 4
479}
480
481setup_ip4ip6() {
482 setup_ipvX_over_ipvY 4 6
483}
484
485setup_ip6ip6() {
486 setup_ipvX_over_ipvY 6 6
487}
488
489setup_namespaces() {
490 for n in ${NS_A} ${NS_B} ${NS_C} ${NS_R1} ${NS_R2}; do
491 ip netns add ${n} || return 1
492
493 # Disable DAD, so that we don't have to wait to use the
494 # configured IPv6 addresses
495 ip netns exec ${n} sysctl -q net/ipv6/conf/default/accept_dad=0
496 done
497}
498
499setup_veth() {
500 run_cmd ${ns_a} ip link add veth_a type veth peer name veth_b || return 1
501 run_cmd ${ns_a} ip link set veth_b netns ${NS_B}
502
503 run_cmd ${ns_a} ip addr add ${veth4_a_addr}/${veth4_mask} dev veth_a
504 run_cmd ${ns_b} ip addr add ${veth4_b_addr}/${veth4_mask} dev veth_b
505
506 run_cmd ${ns_a} ip addr add ${veth6_a_addr}/${veth6_mask} dev veth_a
507 run_cmd ${ns_b} ip addr add ${veth6_b_addr}/${veth6_mask} dev veth_b
508
509 run_cmd ${ns_a} ip link set veth_a up
510 run_cmd ${ns_b} ip link set veth_b up
511}
512
513setup_vti() {
514 proto=${1}
515 veth_a_addr="${2}"
516 veth_b_addr="${3}"
517 vti_a_addr="${4}"
518 vti_b_addr="${5}"
519 vti_mask=${6}
520
521 [ ${proto} -eq 6 ] && vti_type="vti6" || vti_type="vti"
522
523 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
524 run_cmd ${ns_b} ip link add vti${proto}_b type ${vti_type} local ${veth_b_addr} remote ${veth_a_addr} key 10
525
526 run_cmd ${ns_a} ip addr add ${vti_a_addr}/${vti_mask} dev vti${proto}_a
527 run_cmd ${ns_b} ip addr add ${vti_b_addr}/${vti_mask} dev vti${proto}_b
528
529 run_cmd ${ns_a} ip link set vti${proto}_a up
530 run_cmd ${ns_b} ip link set vti${proto}_b up
531}
532
533setup_vti4() {
534 setup_vti 4 ${veth4_a_addr} ${veth4_b_addr} ${tunnel4_a_addr} ${tunnel4_b_addr} ${tunnel4_mask}
535}
536
537setup_vti6() {
538 setup_vti 6 ${veth6_a_addr} ${veth6_b_addr} ${tunnel6_a_addr} ${tunnel6_b_addr} ${tunnel6_mask}
539}
540
541setup_vxlan_or_geneve() {
542 type="${1}"
543 a_addr="${2}"
544 b_addr="${3}"
545 opts="${4}"
546 br_if_a="${5}"
547
548 if [ "${type}" = "vxlan" ]; then
549 opts="${opts} ttl 64 dstport 4789"
550 opts_a="local ${a_addr}"
551 opts_b="local ${b_addr}"
552 else
553 opts_a=""
554 opts_b=""
555 fi
556
557 run_cmd ${ns_a} ip link add ${type}_a type ${type} id 1 ${opts_a} remote ${b_addr} ${opts} || return 1
558 run_cmd ${ns_b} ip link add ${type}_b type ${type} id 1 ${opts_b} remote ${a_addr} ${opts}
559
560 if [ -n "${br_if_a}" ]; then
561 run_cmd ${ns_a} ip addr add ${tunnel4_a_addr}/${tunnel4_mask} dev ${br_if_a}
562 run_cmd ${ns_a} ip addr add ${tunnel6_a_addr}/${tunnel6_mask} dev ${br_if_a}
563 run_cmd ${ns_a} ip link set ${type}_a master ${br_if_a}
564 else
565 run_cmd ${ns_a} ip addr add ${tunnel4_a_addr}/${tunnel4_mask} dev ${type}_a
566 run_cmd ${ns_a} ip addr add ${tunnel6_a_addr}/${tunnel6_mask} dev ${type}_a
567 fi
568
569 run_cmd ${ns_b} ip addr add ${tunnel4_b_addr}/${tunnel4_mask} dev ${type}_b
570 run_cmd ${ns_b} ip addr add ${tunnel6_b_addr}/${tunnel6_mask} dev ${type}_b
571
572 run_cmd ${ns_a} ip link set ${type}_a up
573 run_cmd ${ns_b} ip link set ${type}_b up
574}
575
576setup_geneve4() {
577 setup_vxlan_or_geneve geneve ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1 "df set"
578}
579
580setup_vxlan4() {
581 setup_vxlan_or_geneve vxlan ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1 "df set"
582}
583
584setup_geneve6() {
585 setup_vxlan_or_geneve geneve ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 ""
586}
587
588setup_vxlan6() {
589 setup_vxlan_or_geneve vxlan ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 ""
590}
591
592setup_bridged_geneve4() {
593 setup_vxlan_or_geneve geneve ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1 "df set" "br0"
594}
595
596setup_bridged_vxlan4() {
597 setup_vxlan_or_geneve vxlan ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1 "df set" "br0"
598}
599
600setup_bridged_geneve6() {
601 setup_vxlan_or_geneve geneve ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 "" "br0"
602}
603
604setup_bridged_vxlan6() {
605 setup_vxlan_or_geneve vxlan ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 "" "br0"
606}
607
608setup_xfrm() {
609 proto=${1}
610 veth_a_addr="${2}"
611 veth_b_addr="${3}"
612
613 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 || return 1
614 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
615 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
616 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
617
618 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
619 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
620 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
621 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
622}
623
624setup_xfrm4() {
625 setup_xfrm 4 ${veth4_a_addr} ${veth4_b_addr}
626}
627
628setup_xfrm6() {
629 setup_xfrm 6 ${veth6_a_addr} ${veth6_b_addr}
630}
631
632setup_routing_old() {
633 for i in ${routes}; do
634 [ "${ns}" = "" ] && ns="${i}" && continue
635 [ "${addr}" = "" ] && addr="${i}" && continue
636 [ "${gw}" = "" ] && gw="${i}"
637
638 ns_name="$(nsname ${ns})"
639
640 ip -n ${ns_name} route add ${addr} via ${gw}
641
642 ns=""; addr=""; gw=""
643 done
644}
645
646setup_routing_new() {
647 for i in ${nexthops}; do
648 [ "${ns}" = "" ] && ns="${i}" && continue
649 [ "${fam}" = "" ] && fam="${i}" && continue
650 [ "${nhid}" = "" ] && nhid="${i}" && continue
651 [ "${gw}" = "" ] && gw="${i}" && continue
652 [ "${dev}" = "" ] && dev="${i}"
653
654 ns_name="$(nsname ${ns})"
655
656 ip -n ${ns_name} -${fam} nexthop add id ${nhid} via ${gw} dev ${dev}
657
658 ns=""; fam=""; nhid=""; gw=""; dev=""
659
660 done
661
662 for i in ${routes_nh}; do
663 [ "${ns}" = "" ] && ns="${i}" && continue
664 [ "${fam}" = "" ] && fam="${i}" && continue
665 [ "${addr}" = "" ] && addr="${i}" && continue
666 [ "${nhid}" = "" ] && nhid="${i}"
667
668 ns_name="$(nsname ${ns})"
669
670 ip -n ${ns_name} -${fam} route add ${addr} nhid ${nhid}
671
672 ns=""; fam=""; addr=""; nhid=""
673 done
674}
675
676setup_routing() {
677 for i in ${NS_R1} ${NS_R2}; do
678 ip netns exec ${i} sysctl -q net/ipv4/ip_forward=1
679 ip netns exec ${i} sysctl -q net/ipv6/conf/all/forwarding=1
680 done
681
682 for i in ${routing_addrs}; do
683 [ "${ns}" = "" ] && ns="${i}" && continue
684 [ "${peer}" = "" ] && peer="${i}" && continue
685 [ "${segment}" = "" ] && segment="${i}"
686
687 ns_name="$(nsname ${ns})"
688 peer_name="$(nsname ${peer})"
689 if="veth_${ns}-${peer}"
690 ifpeer="veth_${peer}-${ns}"
691
692 # Create veth links
693 ip link add ${if} up netns ${ns_name} type veth peer name ${ifpeer} netns ${peer_name} || return 1
694 ip -n ${peer_name} link set dev ${ifpeer} up
695
696 # Add addresses
697 ip -n ${ns_name} addr add ${prefix4}.${segment}.1/24 dev ${if}
698 ip -n ${ns_name} addr add ${prefix6}:${segment}::1/64 dev ${if}
699
700 ip -n ${peer_name} addr add ${prefix4}.${segment}.2/24 dev ${ifpeer}
701 ip -n ${peer_name} addr add ${prefix6}:${segment}::2/64 dev ${ifpeer}
702
703 ns=""; peer=""; segment=""
704 done
705
706 if [ "$USE_NH" = "yes" ]; then
707 setup_routing_new
708 else
709 setup_routing_old
710 fi
711
712 return 0
713}
714
715setup_bridge() {
716 run_cmd ${ns_a} ip link add br0 type bridge || return 2
717 run_cmd ${ns_a} ip link set br0 up
718
719 run_cmd ${ns_c} ip link add veth_C-A type veth peer name veth_A-C
720 run_cmd ${ns_c} ip link set veth_A-C netns ns-A
721
722 run_cmd ${ns_a} ip link set veth_A-C up
723 run_cmd ${ns_c} ip link set veth_C-A up
724 run_cmd ${ns_c} ip addr add ${veth4_c_addr}/${veth4_mask} dev veth_C-A
725 run_cmd ${ns_c} ip addr add ${veth6_c_addr}/${veth6_mask} dev veth_C-A
726 run_cmd ${ns_a} ip link set veth_A-C master br0
727}
728
729setup_ovs_vxlan_or_geneve() {
730 type="${1}"
731 a_addr="${2}"
732 b_addr="${3}"
733
734 if [ "${type}" = "vxlan" ]; then
735 opts="${opts} ttl 64 dstport 4789"
736 opts_b="local ${b_addr}"
737 fi
738
739 run_cmd ovs-vsctl add-port ovs_br0 ${type}_a -- \
740 set interface ${type}_a type=${type} \
741 options:remote_ip=${b_addr} options:key=1 options:csum=true || return 1
742
743 run_cmd ${ns_b} ip link add ${type}_b type ${type} id 1 ${opts_b} remote ${a_addr} ${opts} || return 1
744
745 run_cmd ${ns_b} ip addr add ${tunnel4_b_addr}/${tunnel4_mask} dev ${type}_b
746 run_cmd ${ns_b} ip addr add ${tunnel6_b_addr}/${tunnel6_mask} dev ${type}_b
747
748 run_cmd ${ns_b} ip link set ${type}_b up
749}
750
751setup_ovs_geneve4() {
752 setup_ovs_vxlan_or_geneve geneve ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1
753}
754
755setup_ovs_vxlan4() {
756 setup_ovs_vxlan_or_geneve vxlan ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1
757}
758
759setup_ovs_geneve6() {
760 setup_ovs_vxlan_or_geneve geneve ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1
761}
762
763setup_ovs_vxlan6() {
764 setup_ovs_vxlan_or_geneve vxlan ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1
765}
766
767setup_ovs_bridge() {
768 run_cmd ovs-vsctl add-br ovs_br0 || return 2
769 run_cmd ip link set ovs_br0 up
770
771 run_cmd ${ns_c} ip link add veth_C-A type veth peer name veth_A-C
772 run_cmd ${ns_c} ip link set veth_A-C netns 1
773
774 run_cmd ip link set veth_A-C up
775 run_cmd ${ns_c} ip link set veth_C-A up
776 run_cmd ${ns_c} ip addr add ${veth4_c_addr}/${veth4_mask} dev veth_C-A
777 run_cmd ${ns_c} ip addr add ${veth6_c_addr}/${veth6_mask} dev veth_C-A
778 run_cmd ovs-vsctl add-port ovs_br0 veth_A-C
779
780 # Move veth_A-R1 to init
781 run_cmd ${ns_a} ip link set veth_A-R1 netns 1
782 run_cmd ip addr add ${prefix4}.${a_r1}.1/${veth4_mask} dev veth_A-R1
783 run_cmd ip addr add ${prefix6}:${a_r1}::1/${veth6_mask} dev veth_A-R1
784 run_cmd ip link set veth_A-R1 up
785 run_cmd ip route add ${prefix4}.${b_r1}.1 via ${prefix4}.${a_r1}.2
786 run_cmd ip route add ${prefix6}:${b_r1}::1 via ${prefix6}:${a_r1}::2
787}
788
789setup() {
790 [ "$(id -u)" -ne 0 ] && echo " need to run as root" && return $ksft_skip
791
792 cleanup
793 for arg do
794 eval setup_${arg} || { echo " ${arg} not supported"; return 1; }
795 done
796}
797
798trace() {
799 [ $TRACING -eq 0 ] && return
800
801 for arg do
802 [ "${ns_cmd}" = "" ] && ns_cmd="${arg}" && continue
803 ${ns_cmd} tcpdump -s 0 -i "${arg}" -w "${name}_${arg}.pcap" 2> /dev/null &
804 tcpdump_pids="${tcpdump_pids} $!"
805 ns_cmd=
806 done
807 sleep 1
808}
809
810cleanup() {
811 for pid in ${tcpdump_pids}; do
812 kill ${pid}
813 done
814 tcpdump_pids=
815
816 for n in ${NS_A} ${NS_B} ${NS_C} ${NS_R1} ${NS_R2}; do
817 ip netns del ${n} 2> /dev/null
818 done
819
820 ip link del veth_A-C 2>/dev/null
821 ip link del veth_A-R1 2>/dev/null
822 ovs-vsctl --if-exists del-port vxlan_a 2>/dev/null
823 ovs-vsctl --if-exists del-br ovs_br0 2>/dev/null
824}
825
826mtu() {
827 ns_cmd="${1}"
828 dev="${2}"
829 mtu="${3}"
830
831 ${ns_cmd} ip link set dev ${dev} mtu ${mtu}
832}
833
834mtu_parse() {
835 input="${1}"
836
837 next=0
838 for i in ${input}; do
839 [ ${next} -eq 1 -a "${i}" = "lock" ] && next=2 && continue
840 [ ${next} -eq 1 ] && echo "${i}" && return
841 [ ${next} -eq 2 ] && echo "lock ${i}" && return
842 [ "${i}" = "mtu" ] && next=1
843 done
844}
845
846link_get() {
847 ns_cmd="${1}"
848 name="${2}"
849
850 ${ns_cmd} ip link show dev "${name}"
851}
852
853link_get_mtu() {
854 ns_cmd="${1}"
855 name="${2}"
856
857 mtu_parse "$(link_get "${ns_cmd}" ${name})"
858}
859
860route_get_dst_exception() {
861 ns_cmd="${1}"
862 dst="${2}"
863
864 ${ns_cmd} ip route get "${dst}"
865}
866
867route_get_dst_pmtu_from_exception() {
868 ns_cmd="${1}"
869 dst="${2}"
870
871 mtu_parse "$(route_get_dst_exception "${ns_cmd}" ${dst})"
872}
873
874check_pmtu_value() {
875 expected="${1}"
876 value="${2}"
877 event="${3}"
878
879 [ "${expected}" = "any" ] && [ -n "${value}" ] && return 0
880 [ "${value}" = "${expected}" ] && return 0
881 [ -z "${value}" ] && err " PMTU exception wasn't created after ${event}" && return 1
882 [ -z "${expected}" ] && err " PMTU exception shouldn't exist after ${event}" && return 1
883 err " found PMTU exception with incorrect MTU ${value}, expected ${expected}, after ${event}"
884 return 1
885}
886
887test_pmtu_ipvX() {
888 family=${1}
889
890 setup namespaces routing || return 2
891 trace "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \
892 "${ns_r1}" veth_R1-B "${ns_b}" veth_B-R1 \
893 "${ns_a}" veth_A-R2 "${ns_r2}" veth_R2-A \
894 "${ns_r2}" veth_R2-B "${ns_b}" veth_B-R2
895
896 if [ ${family} -eq 4 ]; then
897 ping=ping
898 dst1="${prefix4}.${b_r1}.1"
899 dst2="${prefix4}.${b_r2}.1"
900 else
901 ping=${ping6}
902 dst1="${prefix6}:${b_r1}::1"
903 dst2="${prefix6}:${b_r2}::1"
904 fi
905
906 # Set up initial MTU values
907 mtu "${ns_a}" veth_A-R1 2000
908 mtu "${ns_r1}" veth_R1-A 2000
909 mtu "${ns_r1}" veth_R1-B 1400
910 mtu "${ns_b}" veth_B-R1 1400
911
912 mtu "${ns_a}" veth_A-R2 2000
913 mtu "${ns_r2}" veth_R2-A 2000
914 mtu "${ns_r2}" veth_R2-B 1500
915 mtu "${ns_b}" veth_B-R2 1500
916
917 # Create route exceptions
918 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1800 ${dst1}
919 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1800 ${dst2}
920
921 # Check that exceptions have been created with the correct PMTU
922 pmtu_1="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst1})"
923 check_pmtu_value "1400" "${pmtu_1}" "exceeding MTU" || return 1
924 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})"
925 check_pmtu_value "1500" "${pmtu_2}" "exceeding MTU" || return 1
926
927 # Decrease local MTU below PMTU, check for PMTU decrease in route exception
928 mtu "${ns_a}" veth_A-R1 1300
929 mtu "${ns_r1}" veth_R1-A 1300
930 pmtu_1="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst1})"
931 check_pmtu_value "1300" "${pmtu_1}" "decreasing local MTU" || return 1
932 # Second exception shouldn't be modified
933 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})"
934 check_pmtu_value "1500" "${pmtu_2}" "changing local MTU on a link not on this path" || return 1
935
936 # Increase MTU, check for PMTU increase in route exception
937 mtu "${ns_a}" veth_A-R1 1700
938 mtu "${ns_r1}" veth_R1-A 1700
939 pmtu_1="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst1})"
940 check_pmtu_value "1700" "${pmtu_1}" "increasing local MTU" || return 1
941 # Second exception shouldn't be modified
942 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})"
943 check_pmtu_value "1500" "${pmtu_2}" "changing local MTU on a link not on this path" || return 1
944
945 # Skip PMTU locking tests for IPv6
946 [ $family -eq 6 ] && return 0
947
948 # Decrease remote MTU on path via R2, get new exception
949 mtu "${ns_r2}" veth_R2-B 400
950 mtu "${ns_b}" veth_B-R2 400
951 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1400 ${dst2}
952 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})"
953 check_pmtu_value "lock 552" "${pmtu_2}" "exceeding MTU, with MTU < min_pmtu" || return 1
954
955 # Decrease local MTU below PMTU
956 mtu "${ns_a}" veth_A-R2 500
957 mtu "${ns_r2}" veth_R2-A 500
958 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})"
959 check_pmtu_value "500" "${pmtu_2}" "decreasing local MTU" || return 1
960
961 # Increase local MTU
962 mtu "${ns_a}" veth_A-R2 1500
963 mtu "${ns_r2}" veth_R2-A 1500
964 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})"
965 check_pmtu_value "1500" "${pmtu_2}" "increasing local MTU" || return 1
966
967 # Get new exception
968 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1400 ${dst2}
969 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})"
970 check_pmtu_value "lock 552" "${pmtu_2}" "exceeding MTU, with MTU < min_pmtu" || return 1
971}
972
973test_pmtu_ipv4_exception() {
974 test_pmtu_ipvX 4
975}
976
977test_pmtu_ipv6_exception() {
978 test_pmtu_ipvX 6
979}
980
981test_pmtu_ipvX_over_vxlanY_or_geneveY_exception() {
982 type=${1}
983 family=${2}
984 outer_family=${3}
985 ll_mtu=4000
986
987 if [ ${outer_family} -eq 4 ]; then
988 setup namespaces routing ${type}4 || return 2
989 # IPv4 header UDP header VXLAN/GENEVE header Ethernet header
990 exp_mtu=$((${ll_mtu} - 20 - 8 - 8 - 14))
991 else
992 setup namespaces routing ${type}6 || return 2
993 # IPv6 header UDP header VXLAN/GENEVE header Ethernet header
994 exp_mtu=$((${ll_mtu} - 40 - 8 - 8 - 14))
995 fi
996
997 trace "${ns_a}" ${type}_a "${ns_b}" ${type}_b \
998 "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \
999 "${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B
1000
1001 if [ ${family} -eq 4 ]; then
1002 ping=ping
1003 dst=${tunnel4_b_addr}
1004 else
1005 ping=${ping6}
1006 dst=${tunnel6_b_addr}
1007 fi
1008
1009 # Create route exception by exceeding link layer MTU
1010 mtu "${ns_a}" veth_A-R1 $((${ll_mtu} + 1000))
1011 mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000))
1012 mtu "${ns_b}" veth_B-R1 ${ll_mtu}
1013 mtu "${ns_r1}" veth_R1-B ${ll_mtu}
1014
1015 mtu "${ns_a}" ${type}_a $((${ll_mtu} + 1000))
1016 mtu "${ns_b}" ${type}_b $((${ll_mtu} + 1000))
1017 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${dst}
1018
1019 # Check that exception was created
1020 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst})"
1021 check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on ${type} interface"
1022}
1023
1024test_pmtu_ipv4_vxlan4_exception() {
1025 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception vxlan 4 4
1026}
1027
1028test_pmtu_ipv6_vxlan4_exception() {
1029 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception vxlan 6 4
1030}
1031
1032test_pmtu_ipv4_geneve4_exception() {
1033 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception geneve 4 4
1034}
1035
1036test_pmtu_ipv6_geneve4_exception() {
1037 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception geneve 6 4
1038}
1039
1040test_pmtu_ipv4_vxlan6_exception() {
1041 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception vxlan 4 6
1042}
1043
1044test_pmtu_ipv6_vxlan6_exception() {
1045 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception vxlan 6 6
1046}
1047
1048test_pmtu_ipv4_geneve6_exception() {
1049 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception geneve 4 6
1050}
1051
1052test_pmtu_ipv6_geneve6_exception() {
1053 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception geneve 6 6
1054}
1055
1056test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception() {
1057 type=${1}
1058 family=${2}
1059 outer_family=${3}
1060 ll_mtu=4000
1061
1062 if [ ${outer_family} -eq 4 ]; then
1063 setup namespaces routing bridge bridged_${type}4 || return 2
1064 # IPv4 header UDP header VXLAN/GENEVE header Ethernet header
1065 exp_mtu=$((${ll_mtu} - 20 - 8 - 8 - 14))
1066 else
1067 setup namespaces routing bridge bridged_${type}6 || return 2
1068 # IPv6 header UDP header VXLAN/GENEVE header Ethernet header
1069 exp_mtu=$((${ll_mtu} - 40 - 8 - 8 - 14))
1070 fi
1071
1072 trace "${ns_a}" ${type}_a "${ns_b}" ${type}_b \
1073 "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \
1074 "${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B \
1075 "${ns_a}" br0 "${ns_a}" veth-A-C \
1076 "${ns_c}" veth_C-A
1077
1078 if [ ${family} -eq 4 ]; then
1079 ping=ping
1080 dst=${tunnel4_b_addr}
1081 else
1082 ping=${ping6}
1083 dst=${tunnel6_b_addr}
1084 fi
1085
1086 # Create route exception by exceeding link layer MTU
1087 mtu "${ns_a}" veth_A-R1 $((${ll_mtu} + 1000))
1088 mtu "${ns_a}" br0 $((${ll_mtu} + 1000))
1089 mtu "${ns_a}" veth_A-C $((${ll_mtu} + 1000))
1090 mtu "${ns_c}" veth_C-A $((${ll_mtu} + 1000))
1091 mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000))
1092 mtu "${ns_b}" veth_B-R1 ${ll_mtu}
1093 mtu "${ns_r1}" veth_R1-B ${ll_mtu}
1094
1095 mtu "${ns_a}" ${type}_a $((${ll_mtu} + 1000))
1096 mtu "${ns_b}" ${type}_b $((${ll_mtu} + 1000))
1097
1098 run_cmd ${ns_c} ${ping} -q -M want -i 0.1 -c 10 -s $((${ll_mtu} + 500)) ${dst} || return 1
1099 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${dst} || return 1
1100
1101 # Check that exceptions were created
1102 pmtu="$(route_get_dst_pmtu_from_exception "${ns_c}" ${dst})"
1103 check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on bridged ${type} interface"
1104 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst})"
1105 check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on locally bridged ${type} interface"
1106}
1107
1108test_pmtu_ipv4_br_vxlan4_exception() {
1109 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception vxlan 4 4
1110}
1111
1112test_pmtu_ipv6_br_vxlan4_exception() {
1113 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception vxlan 6 4
1114}
1115
1116test_pmtu_ipv4_br_geneve4_exception() {
1117 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception geneve 4 4
1118}
1119
1120test_pmtu_ipv6_br_geneve4_exception() {
1121 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception geneve 6 4
1122}
1123
1124test_pmtu_ipv4_br_vxlan6_exception() {
1125 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception vxlan 4 6
1126}
1127
1128test_pmtu_ipv6_br_vxlan6_exception() {
1129 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception vxlan 6 6
1130}
1131
1132test_pmtu_ipv4_br_geneve6_exception() {
1133 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception geneve 4 6
1134}
1135
1136test_pmtu_ipv6_br_geneve6_exception() {
1137 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception geneve 6 6
1138}
1139
1140test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception() {
1141 type=${1}
1142 family=${2}
1143 outer_family=${3}
1144 ll_mtu=4000
1145
1146 if [ ${outer_family} -eq 4 ]; then
1147 setup namespaces routing ovs_bridge ovs_${type}4 || return 2
1148 # IPv4 header UDP header VXLAN/GENEVE header Ethernet header
1149 exp_mtu=$((${ll_mtu} - 20 - 8 - 8 - 14))
1150 else
1151 setup namespaces routing ovs_bridge ovs_${type}6 || return 2
1152 # IPv6 header UDP header VXLAN/GENEVE header Ethernet header
1153 exp_mtu=$((${ll_mtu} - 40 - 8 - 8 - 14))
1154 fi
1155
1156 if [ "${type}" = "vxlan" ]; then
1157 tun_a="vxlan_sys_4789"
1158 elif [ "${type}" = "geneve" ]; then
1159 tun_a="genev_sys_6081"
1160 fi
1161
1162 trace "" "${tun_a}" "${ns_b}" ${type}_b \
1163 "" veth_A-R1 "${ns_r1}" veth_R1-A \
1164 "${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B \
1165 "" ovs_br0 "" veth-A-C \
1166 "${ns_c}" veth_C-A
1167
1168 if [ ${family} -eq 4 ]; then
1169 ping=ping
1170 dst=${tunnel4_b_addr}
1171 else
1172 ping=${ping6}
1173 dst=${tunnel6_b_addr}
1174 fi
1175
1176 # Create route exception by exceeding link layer MTU
1177 mtu "" veth_A-R1 $((${ll_mtu} + 1000))
1178 mtu "" ovs_br0 $((${ll_mtu} + 1000))
1179 mtu "" veth_A-C $((${ll_mtu} + 1000))
1180 mtu "${ns_c}" veth_C-A $((${ll_mtu} + 1000))
1181 mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000))
1182 mtu "${ns_b}" veth_B-R1 ${ll_mtu}
1183 mtu "${ns_r1}" veth_R1-B ${ll_mtu}
1184
1185 mtu "" ${tun_a} $((${ll_mtu} + 1000))
1186 mtu "${ns_b}" ${type}_b $((${ll_mtu} + 1000))
1187
1188 run_cmd ${ns_c} ${ping} -q -M want -i 0.1 -c 20 -s $((${ll_mtu} + 500)) ${dst} || return 1
1189
1190 # Check that exceptions were created
1191 pmtu="$(route_get_dst_pmtu_from_exception "${ns_c}" ${dst})"
1192 check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on Open vSwitch ${type} interface"
1193}
1194
1195test_pmtu_ipv4_ovs_vxlan4_exception() {
1196 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception vxlan 4 4
1197}
1198
1199test_pmtu_ipv6_ovs_vxlan4_exception() {
1200 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception vxlan 6 4
1201}
1202
1203test_pmtu_ipv4_ovs_geneve4_exception() {
1204 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception geneve 4 4
1205}
1206
1207test_pmtu_ipv6_ovs_geneve4_exception() {
1208 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception geneve 6 4
1209}
1210
1211test_pmtu_ipv4_ovs_vxlan6_exception() {
1212 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception vxlan 4 6
1213}
1214
1215test_pmtu_ipv6_ovs_vxlan6_exception() {
1216 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception vxlan 6 6
1217}
1218
1219test_pmtu_ipv4_ovs_geneve6_exception() {
1220 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception geneve 4 6
1221}
1222
1223test_pmtu_ipv6_ovs_geneve6_exception() {
1224 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception geneve 6 6
1225}
1226
1227test_pmtu_ipvX_over_fouY_or_gueY() {
1228 inner_family=${1}
1229 outer_family=${2}
1230 encap=${3}
1231 ll_mtu=4000
1232
1233 setup namespaces routing ${encap}${outer_family}${inner_family} || return 2
1234 trace "${ns_a}" ${encap}_a "${ns_b}" ${encap}_b \
1235 "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \
1236 "${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B
1237
1238 if [ ${inner_family} -eq 4 ]; then
1239 ping=ping
1240 dst=${tunnel4_b_addr}
1241 else
1242 ping=${ping6}
1243 dst=${tunnel6_b_addr}
1244 fi
1245
1246 if [ "${encap}" = "gue" ]; then
1247 encap_overhead=4
1248 else
1249 encap_overhead=0
1250 fi
1251
1252 if [ ${outer_family} -eq 4 ]; then
1253 # IPv4 header UDP header
1254 exp_mtu=$((${ll_mtu} - 20 - 8 - ${encap_overhead}))
1255 else
1256 # IPv6 header Option 4 UDP header
1257 exp_mtu=$((${ll_mtu} - 40 - 8 - 8 - ${encap_overhead}))
1258 fi
1259
1260 # Create route exception by exceeding link layer MTU
1261 mtu "${ns_a}" veth_A-R1 $((${ll_mtu} + 1000))
1262 mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000))
1263 mtu "${ns_b}" veth_B-R1 ${ll_mtu}
1264 mtu "${ns_r1}" veth_R1-B ${ll_mtu}
1265
1266 mtu "${ns_a}" ${encap}_a $((${ll_mtu} + 1000))
1267 mtu "${ns_b}" ${encap}_b $((${ll_mtu} + 1000))
1268 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${dst}
1269
1270 # Check that exception was created
1271 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst})"
1272 check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on ${encap} interface"
1273}
1274
1275test_pmtu_ipv4_fou4_exception() {
1276 test_pmtu_ipvX_over_fouY_or_gueY 4 4 fou
1277}
1278
1279test_pmtu_ipv6_fou4_exception() {
1280 test_pmtu_ipvX_over_fouY_or_gueY 6 4 fou
1281}
1282
1283test_pmtu_ipv4_fou6_exception() {
1284 test_pmtu_ipvX_over_fouY_or_gueY 4 6 fou
1285}
1286
1287test_pmtu_ipv6_fou6_exception() {
1288 test_pmtu_ipvX_over_fouY_or_gueY 6 6 fou
1289}
1290
1291test_pmtu_ipv4_gue4_exception() {
1292 test_pmtu_ipvX_over_fouY_or_gueY 4 4 gue
1293}
1294
1295test_pmtu_ipv6_gue4_exception() {
1296 test_pmtu_ipvX_over_fouY_or_gueY 6 4 gue
1297}
1298
1299test_pmtu_ipv4_gue6_exception() {
1300 test_pmtu_ipvX_over_fouY_or_gueY 4 6 gue
1301}
1302
1303test_pmtu_ipv6_gue6_exception() {
1304 test_pmtu_ipvX_over_fouY_or_gueY 6 6 gue
1305}
1306
1307test_pmtu_ipvX_over_ipvY_exception() {
1308 inner=${1}
1309 outer=${2}
1310 ll_mtu=4000
1311
1312 setup namespaces routing ip${inner}ip${outer} || return 2
1313
1314 trace "${ns_a}" ip_a "${ns_b}" ip_b \
1315 "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \
1316 "${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B
1317
1318 if [ ${inner} -eq 4 ]; then
1319 ping=ping
1320 dst=${tunnel4_b_addr}
1321 else
1322 ping=${ping6}
1323 dst=${tunnel6_b_addr}
1324 fi
1325
1326 if [ ${outer} -eq 4 ]; then
1327 # IPv4 header
1328 exp_mtu=$((${ll_mtu} - 20))
1329 else
1330 # IPv6 header Option 4
1331 exp_mtu=$((${ll_mtu} - 40 - 8))
1332 fi
1333
1334 # Create route exception by exceeding link layer MTU
1335 mtu "${ns_a}" veth_A-R1 $((${ll_mtu} + 1000))
1336 mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000))
1337 mtu "${ns_b}" veth_B-R1 ${ll_mtu}
1338 mtu "${ns_r1}" veth_R1-B ${ll_mtu}
1339
1340 mtu "${ns_a}" ip_a $((${ll_mtu} + 1000)) || return
1341 mtu "${ns_b}" ip_b $((${ll_mtu} + 1000)) || return
1342 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${dst}
1343
1344 # Check that exception was created
1345 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst})"
1346 check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on ip${inner}ip${outer} interface"
1347}
1348
1349test_pmtu_ipv4_ipv4_exception() {
1350 test_pmtu_ipvX_over_ipvY_exception 4 4
1351}
1352
1353test_pmtu_ipv6_ipv4_exception() {
1354 test_pmtu_ipvX_over_ipvY_exception 6 4
1355}
1356
1357test_pmtu_ipv4_ipv6_exception() {
1358 test_pmtu_ipvX_over_ipvY_exception 4 6
1359}
1360
1361test_pmtu_ipv6_ipv6_exception() {
1362 test_pmtu_ipvX_over_ipvY_exception 6 6
1363}
1364
1365test_pmtu_vti4_exception() {
1366 setup namespaces veth vti4 xfrm4 || return 2
1367 trace "${ns_a}" veth_a "${ns_b}" veth_b \
1368 "${ns_a}" vti4_a "${ns_b}" vti4_b
1369
1370 veth_mtu=1500
1371 vti_mtu=$((veth_mtu - 20))
1372
1373 # SPI SN IV ICV pad length next header
1374 esp_payload_rfc4106=$((vti_mtu - 4 - 4 - 8 - 16 - 1 - 1))
1375 ping_payload=$((esp_payload_rfc4106 - 28))
1376
1377 mtu "${ns_a}" veth_a ${veth_mtu}
1378 mtu "${ns_b}" veth_b ${veth_mtu}
1379 mtu "${ns_a}" vti4_a ${vti_mtu}
1380 mtu "${ns_b}" vti4_b ${vti_mtu}
1381
1382 # Send DF packet without exceeding link layer MTU, check that no
1383 # exception is created
1384 run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s ${ping_payload} ${tunnel4_b_addr}
1385 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel4_b_addr})"
1386 check_pmtu_value "" "${pmtu}" "sending packet smaller than PMTU (IP payload length ${esp_payload_rfc4106})" || return 1
1387
1388 # Now exceed link layer MTU by one byte, check that exception is created
1389 # with the right PMTU value
1390 run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s $((ping_payload + 1)) ${tunnel4_b_addr}
1391 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel4_b_addr})"
1392 check_pmtu_value "${esp_payload_rfc4106}" "${pmtu}" "exceeding PMTU (IP payload length $((esp_payload_rfc4106 + 1)))"
1393}
1394
1395test_pmtu_vti6_exception() {
1396 setup namespaces veth vti6 xfrm6 || return 2
1397 trace "${ns_a}" veth_a "${ns_b}" veth_b \
1398 "${ns_a}" vti6_a "${ns_b}" vti6_b
1399 fail=0
1400
1401 # Create route exception by exceeding link layer MTU
1402 mtu "${ns_a}" veth_a 4000
1403 mtu "${ns_b}" veth_b 4000
1404 mtu "${ns_a}" vti6_a 5000
1405 mtu "${ns_b}" vti6_b 5000
1406 run_cmd ${ns_a} ${ping6} -q -i 0.1 -w 1 -s 60000 ${tunnel6_b_addr}
1407
1408 # Check that exception was created
1409 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})"
1410 check_pmtu_value any "${pmtu}" "creating tunnel exceeding link layer MTU" || return 1
1411
1412 # Decrease tunnel MTU, check for PMTU decrease in route exception
1413 mtu "${ns_a}" vti6_a 3000
1414 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})"
1415 check_pmtu_value "3000" "${pmtu}" "decreasing tunnel MTU" || fail=1
1416
1417 # Increase tunnel MTU, check for PMTU increase in route exception
1418 mtu "${ns_a}" vti6_a 9000
1419 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})"
1420 check_pmtu_value "9000" "${pmtu}" "increasing tunnel MTU" || fail=1
1421
1422 return ${fail}
1423}
1424
1425test_pmtu_vti4_default_mtu() {
1426 setup namespaces veth vti4 || return 2
1427
1428 # Check that MTU of vti device is MTU of veth minus IPv4 header length
1429 veth_mtu="$(link_get_mtu "${ns_a}" veth_a)"
1430 vti4_mtu="$(link_get_mtu "${ns_a}" vti4_a)"
1431 if [ $((veth_mtu - vti4_mtu)) -ne 20 ]; then
1432 err " vti MTU ${vti4_mtu} is not veth MTU ${veth_mtu} minus IPv4 header length"
1433 return 1
1434 fi
1435}
1436
1437test_pmtu_vti6_default_mtu() {
1438 setup namespaces veth vti6 || return 2
1439
1440 # Check that MTU of vti device is MTU of veth minus IPv6 header length
1441 veth_mtu="$(link_get_mtu "${ns_a}" veth_a)"
1442 vti6_mtu="$(link_get_mtu "${ns_a}" vti6_a)"
1443 if [ $((veth_mtu - vti6_mtu)) -ne 40 ]; then
1444 err " vti MTU ${vti6_mtu} is not veth MTU ${veth_mtu} minus IPv6 header length"
1445 return 1
1446 fi
1447}
1448
1449test_pmtu_vti4_link_add_mtu() {
1450 setup namespaces || return 2
1451
1452 run_cmd ${ns_a} ip link add vti4_a type vti local ${veth4_a_addr} remote ${veth4_b_addr} key 10
1453 [ $? -ne 0 ] && err " vti not supported" && return 2
1454 run_cmd ${ns_a} ip link del vti4_a
1455
1456 fail=0
1457
1458 min=68
1459 max=$((65535 - 20))
1460 # Check invalid values first
1461 for v in $((min - 1)) $((max + 1)); do
1462 run_cmd ${ns_a} ip link add vti4_a mtu ${v} type vti local ${veth4_a_addr} remote ${veth4_b_addr} key 10
1463 # This can fail, or MTU can be adjusted to a proper value
1464 [ $? -ne 0 ] && continue
1465 mtu="$(link_get_mtu "${ns_a}" vti4_a)"
1466 if [ ${mtu} -lt ${min} -o ${mtu} -gt ${max} ]; then
1467 err " vti tunnel created with invalid MTU ${mtu}"
1468 fail=1
1469 fi
1470 run_cmd ${ns_a} ip link del vti4_a
1471 done
1472
1473 # Now check valid values
1474 for v in ${min} 1300 ${max}; do
1475 run_cmd ${ns_a} ip link add vti4_a mtu ${v} type vti local ${veth4_a_addr} remote ${veth4_b_addr} key 10
1476 mtu="$(link_get_mtu "${ns_a}" vti4_a)"
1477 run_cmd ${ns_a} ip link del vti4_a
1478 if [ "${mtu}" != "${v}" ]; then
1479 err " vti MTU ${mtu} doesn't match configured value ${v}"
1480 fail=1
1481 fi
1482 done
1483
1484 return ${fail}
1485}
1486
1487test_pmtu_vti6_link_add_mtu() {
1488 setup namespaces || return 2
1489
1490 run_cmd ${ns_a} ip link add vti6_a type vti6 local ${veth6_a_addr} remote ${veth6_b_addr} key 10
1491 [ $? -ne 0 ] && err " vti6 not supported" && return 2
1492 run_cmd ${ns_a} ip link del vti6_a
1493
1494 fail=0
1495
1496 min=68 # vti6 can carry IPv4 packets too
1497 max=$((65535 - 40))
1498 # Check invalid values first
1499 for v in $((min - 1)) $((max + 1)); do
1500 run_cmd ${ns_a} ip link add vti6_a mtu ${v} type vti6 local ${veth6_a_addr} remote ${veth6_b_addr} key 10
1501 # This can fail, or MTU can be adjusted to a proper value
1502 [ $? -ne 0 ] && continue
1503 mtu="$(link_get_mtu "${ns_a}" vti6_a)"
1504 if [ ${mtu} -lt ${min} -o ${mtu} -gt ${max} ]; then
1505 err " vti6 tunnel created with invalid MTU ${v}"
1506 fail=1
1507 fi
1508 run_cmd ${ns_a} ip link del vti6_a
1509 done
1510
1511 # Now check valid values
1512 for v in 68 1280 1300 $((65535 - 40)); do
1513 run_cmd ${ns_a} ip link add vti6_a mtu ${v} type vti6 local ${veth6_a_addr} remote ${veth6_b_addr} key 10
1514 mtu="$(link_get_mtu "${ns_a}" vti6_a)"
1515 run_cmd ${ns_a} ip link del vti6_a
1516 if [ "${mtu}" != "${v}" ]; then
1517 err " vti6 MTU ${mtu} doesn't match configured value ${v}"
1518 fail=1
1519 fi
1520 done
1521
1522 return ${fail}
1523}
1524
1525test_pmtu_vti6_link_change_mtu() {
1526 setup namespaces || return 2
1527
1528 run_cmd ${ns_a} ip link add dummy0 mtu 1500 type dummy
1529 [ $? -ne 0 ] && err " dummy not supported" && return 2
1530 run_cmd ${ns_a} ip link add dummy1 mtu 3000 type dummy
1531 run_cmd ${ns_a} ip link set dummy0 up
1532 run_cmd ${ns_a} ip link set dummy1 up
1533
1534 run_cmd ${ns_a} ip addr add ${dummy6_0_prefix}1/${dummy6_mask} dev dummy0
1535 run_cmd ${ns_a} ip addr add ${dummy6_1_prefix}1/${dummy6_mask} dev dummy1
1536
1537 fail=0
1538
1539 # Create vti6 interface bound to device, passing MTU, check it
1540 run_cmd ${ns_a} ip link add vti6_a mtu 1300 type vti6 remote ${dummy6_0_prefix}2 local ${dummy6_0_prefix}1
1541 mtu="$(link_get_mtu "${ns_a}" vti6_a)"
1542 if [ ${mtu} -ne 1300 ]; then
1543 err " vti6 MTU ${mtu} doesn't match configured value 1300"
1544 fail=1
1545 fi
1546
1547 # Move to another device with different MTU, without passing MTU, check
1548 # MTU is adjusted
1549 run_cmd ${ns_a} ip link set vti6_a type vti6 remote ${dummy6_1_prefix}2 local ${dummy6_1_prefix}1
1550 mtu="$(link_get_mtu "${ns_a}" vti6_a)"
1551 if [ ${mtu} -ne $((3000 - 40)) ]; then
1552 err " vti MTU ${mtu} is not dummy MTU 3000 minus IPv6 header length"
1553 fail=1
1554 fi
1555
1556 # Move it back, passing MTU, check MTU is not overridden
1557 run_cmd ${ns_a} ip link set vti6_a mtu 1280 type vti6 remote ${dummy6_0_prefix}2 local ${dummy6_0_prefix}1
1558 mtu="$(link_get_mtu "${ns_a}" vti6_a)"
1559 if [ ${mtu} -ne 1280 ]; then
1560 err " vti6 MTU ${mtu} doesn't match configured value 1280"
1561 fail=1
1562 fi
1563
1564 return ${fail}
1565}
1566
1567check_command() {
1568 cmd=${1}
1569
1570 if ! which ${cmd} > /dev/null 2>&1; then
1571 err " missing required command: '${cmd}'"
1572 return 1
1573 fi
1574 return 0
1575}
1576
1577test_cleanup_vxlanX_exception() {
1578 outer="${1}"
1579 encap="vxlan"
1580 ll_mtu=4000
1581
1582 check_command taskset || return 2
1583 cpu_list=$(grep -m 2 processor /proc/cpuinfo | cut -d ' ' -f 2)
1584
1585 setup namespaces routing ${encap}${outer} || return 2
1586 trace "${ns_a}" ${encap}_a "${ns_b}" ${encap}_b \
1587 "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \
1588 "${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B
1589
1590 # Create route exception by exceeding link layer MTU
1591 mtu "${ns_a}" veth_A-R1 $((${ll_mtu} + 1000))
1592 mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000))
1593 mtu "${ns_b}" veth_B-R1 ${ll_mtu}
1594 mtu "${ns_r1}" veth_R1-B ${ll_mtu}
1595
1596 mtu "${ns_a}" ${encap}_a $((${ll_mtu} + 1000))
1597 mtu "${ns_b}" ${encap}_b $((${ll_mtu} + 1000))
1598
1599 # Fill exception cache for multiple CPUs (2)
1600 # we can always use inner IPv4 for that
1601 for cpu in ${cpu_list}; do
1602 run_cmd taskset --cpu-list ${cpu} ${ns_a} ping -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${tunnel4_b_addr}
1603 done
1604
1605 ${ns_a} ip link del dev veth_A-R1 &
1606 iplink_pid=$!
1607 sleep 1
1608 if [ "$(cat /proc/${iplink_pid}/cmdline 2>/dev/null | tr -d '\0')" = "iplinkdeldevveth_A-R1" ]; then
1609 err " can't delete veth device in a timely manner, PMTU dst likely leaked"
1610 return 1
1611 fi
1612}
1613
1614test_cleanup_ipv6_exception() {
1615 test_cleanup_vxlanX_exception 6
1616}
1617
1618test_cleanup_ipv4_exception() {
1619 test_cleanup_vxlanX_exception 4
1620}
1621
1622run_test() {
1623 (
1624 tname="$1"
1625 tdesc="$2"
1626
1627 unset IFS
1628
1629 if [ "$VERBOSE" = "1" ]; then
1630 printf "\n##########################################################################\n\n"
1631 fi
1632
1633 eval test_${tname}
1634 ret=$?
1635
1636 if [ $ret -eq 0 ]; then
1637 printf "TEST: %-60s [ OK ]\n" "${tdesc}"
1638 elif [ $ret -eq 1 ]; then
1639 printf "TEST: %-60s [FAIL]\n" "${tdesc}"
1640 if [ "${PAUSE_ON_FAIL}" = "yes" ]; then
1641 echo
1642 echo "Pausing. Hit enter to continue"
1643 read a
1644 fi
1645 err_flush
1646 exit 1
1647 elif [ $ret -eq 2 ]; then
1648 printf "TEST: %-60s [SKIP]\n" "${tdesc}"
1649 err_flush
1650 fi
1651
1652 return $ret
1653 )
1654 ret=$?
1655 [ $ret -ne 0 ] && exitcode=1
1656
1657 return $ret
1658}
1659
1660run_test_nh() {
1661 tname="$1"
1662 tdesc="$2"
1663
1664 USE_NH=yes
1665 run_test "${tname}" "${tdesc} - nexthop objects"
1666 USE_NH=no
1667}
1668
1669test_list_flush_ipv4_exception() {
1670 setup namespaces routing || return 2
1671 trace "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \
1672 "${ns_r1}" veth_R1-B "${ns_b}" veth_B-R1 \
1673 "${ns_a}" veth_A-R2 "${ns_r2}" veth_R2-A \
1674 "${ns_r2}" veth_R2-B "${ns_b}" veth_B-R2
1675
1676 dst_prefix1="${prefix4}.${b_r1}."
1677 dst2="${prefix4}.${b_r2}.1"
1678
1679 # Set up initial MTU values
1680 mtu "${ns_a}" veth_A-R1 2000
1681 mtu "${ns_r1}" veth_R1-A 2000
1682 mtu "${ns_r1}" veth_R1-B 1500
1683 mtu "${ns_b}" veth_B-R1 1500
1684
1685 mtu "${ns_a}" veth_A-R2 2000
1686 mtu "${ns_r2}" veth_R2-A 2000
1687 mtu "${ns_r2}" veth_R2-B 1500
1688 mtu "${ns_b}" veth_B-R2 1500
1689
1690 fail=0
1691
1692 # Add 100 addresses for veth endpoint on B reached by default A route
1693 for i in $(seq 100 199); do
1694 run_cmd ${ns_b} ip addr add "${dst_prefix1}${i}" dev veth_B-R1
1695 done
1696
1697 # Create 100 cached route exceptions for path via R1, one via R2. Note
1698 # that with IPv4 we need to actually cause a route lookup that matches
1699 # the exception caused by ICMP, in order to actually have a cached
1700 # route, so we need to ping each destination twice
1701 for i in $(seq 100 199); do
1702 run_cmd ${ns_a} ping -q -M want -i 0.1 -c 2 -s 1800 "${dst_prefix1}${i}"
1703 done
1704 run_cmd ${ns_a} ping -q -M want -i 0.1 -c 2 -s 1800 "${dst2}"
1705
1706 if [ "$(${ns_a} ip -oneline route list cache | wc -l)" -ne 101 ]; then
1707 err " can't list cached exceptions"
1708 fail=1
1709 fi
1710
1711 run_cmd ${ns_a} ip route flush cache
1712 pmtu1="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst_prefix}1)"
1713 pmtu2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst_prefix}2)"
1714 if [ -n "${pmtu1}" ] || [ -n "${pmtu2}" ] || \
1715 [ -n "$(${ns_a} ip route list cache)" ]; then
1716 err " can't flush cached exceptions"
1717 fail=1
1718 fi
1719
1720 return ${fail}
1721}
1722
1723test_list_flush_ipv6_exception() {
1724 setup namespaces routing || return 2
1725 trace "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \
1726 "${ns_r1}" veth_R1-B "${ns_b}" veth_B-R1 \
1727 "${ns_a}" veth_A-R2 "${ns_r2}" veth_R2-A \
1728 "${ns_r2}" veth_R2-B "${ns_b}" veth_B-R2
1729
1730 dst_prefix1="${prefix6}:${b_r1}::"
1731 dst2="${prefix6}:${b_r2}::1"
1732
1733 # Set up initial MTU values
1734 mtu "${ns_a}" veth_A-R1 2000
1735 mtu "${ns_r1}" veth_R1-A 2000
1736 mtu "${ns_r1}" veth_R1-B 1500
1737 mtu "${ns_b}" veth_B-R1 1500
1738
1739 mtu "${ns_a}" veth_A-R2 2000
1740 mtu "${ns_r2}" veth_R2-A 2000
1741 mtu "${ns_r2}" veth_R2-B 1500
1742 mtu "${ns_b}" veth_B-R2 1500
1743
1744 fail=0
1745
1746 # Add 100 addresses for veth endpoint on B reached by default A route
1747 for i in $(seq 100 199); do
1748 run_cmd ${ns_b} ip addr add "${dst_prefix1}${i}" dev veth_B-R1
1749 done
1750
1751 # Create 100 cached route exceptions for path via R1, one via R2
1752 for i in $(seq 100 199); do
1753 run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s 1800 "${dst_prefix1}${i}"
1754 done
1755 run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s 1800 "${dst2}"
1756 if [ "$(${ns_a} ip -oneline -6 route list cache | wc -l)" -ne 101 ]; then
1757 err " can't list cached exceptions"
1758 fail=1
1759 fi
1760
1761 run_cmd ${ns_a} ip -6 route flush cache
1762 pmtu1="$(route_get_dst_pmtu_from_exception "${ns_a}" "${dst_prefix1}100")"
1763 pmtu2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})"
1764 if [ -n "${pmtu1}" ] || [ -n "${pmtu2}" ] || \
1765 [ -n "$(${ns_a} ip -6 route list cache)" ]; then
1766 err " can't flush cached exceptions"
1767 fail=1
1768 fi
1769
1770 return ${fail}
1771}
1772
1773usage() {
1774 echo
1775 echo "$0 [OPTIONS] [TEST]..."
1776 echo "If no TEST argument is given, all tests will be run."
1777 echo
1778 echo "Options"
1779 echo " --trace: capture traffic to TEST_INTERFACE.pcap"
1780 echo
1781 echo "Available tests${tests}"
1782 exit 1
1783}
1784
1785################################################################################
1786#
1787exitcode=0
1788desc=0
1789
1790while getopts :ptv o
1791do
1792 case $o in
1793 p) PAUSE_ON_FAIL=yes;;
1794 v) VERBOSE=1;;
1795 t) if which tcpdump > /dev/null 2>&1; then
1796 TRACING=1
1797 else
1798 echo "=== tcpdump not available, tracing disabled"
1799 fi
1800 ;;
1801 *) usage;;
1802 esac
1803done
1804shift $(($OPTIND-1))
1805
1806IFS="
1807"
1808
1809for arg do
1810 # Check first that all requested tests are available before running any
1811 command -v > /dev/null "test_${arg}" || { echo "=== Test ${arg} not found"; usage; }
1812done
1813
1814trap cleanup EXIT
1815
1816# start clean
1817cleanup
1818
1819HAVE_NH=no
1820ip nexthop ls >/dev/null 2>&1
1821[ $? -eq 0 ] && HAVE_NH=yes
1822
1823name=""
1824desc=""
1825rerun_nh=0
1826for t in ${tests}; do
1827 [ "${name}" = "" ] && name="${t}" && continue
1828 [ "${desc}" = "" ] && desc="${t}" && continue
1829
1830 if [ "${HAVE_NH}" = "yes" ]; then
1831 rerun_nh="${t}"
1832 fi
1833
1834 run_this=1
1835 for arg do
1836 [ "${arg}" != "${arg#--*}" ] && continue
1837 [ "${arg}" = "${name}" ] && run_this=1 && break
1838 run_this=0
1839 done
1840 if [ $run_this -eq 1 ]; then
1841 run_test "${name}" "${desc}"
1842 # if test was skipped no need to retry with nexthop objects
1843 [ $? -eq 2 ] && rerun_nh=0
1844
1845 if [ "${rerun_nh}" = "1" ]; then
1846 run_test_nh "${name}" "${desc}"
1847 fi
1848 fi
1849 name=""
1850 desc=""
1851 rerun_nh=0
1852done
1853
1854exit ${exitcode}