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} 1855