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# - pmtu_ipv4_route_change 167# Use the same topology as in pmtu_ipv4, but issue a route replacement 168# command and delete the corresponding device afterward. This tests for 169# proper cleanup of the PMTU exceptions by the route replacement path. 170# Device unregistration should complete successfully 171# 172# - pmtu_ipv6_route_change 173# Same as above but with IPv6 174 175# Kselftest framework requirement - SKIP code is 4. 176ksft_skip=4 177 178PAUSE_ON_FAIL=no 179VERBOSE=0 180TRACING=0 181 182# Some systems don't have a ping6 binary anymore 183which ping6 > /dev/null 2>&1 && ping6=$(which ping6) || ping6=$(which ping) 184 185# Name Description re-run with nh 186tests=" 187 pmtu_ipv4_exception ipv4: PMTU exceptions 1 188 pmtu_ipv6_exception ipv6: PMTU exceptions 1 189 pmtu_ipv4_vxlan4_exception IPv4 over vxlan4: PMTU exceptions 1 190 pmtu_ipv6_vxlan4_exception IPv6 over vxlan4: PMTU exceptions 1 191 pmtu_ipv4_vxlan6_exception IPv4 over vxlan6: PMTU exceptions 1 192 pmtu_ipv6_vxlan6_exception IPv6 over vxlan6: PMTU exceptions 1 193 pmtu_ipv4_geneve4_exception IPv4 over geneve4: PMTU exceptions 1 194 pmtu_ipv6_geneve4_exception IPv6 over geneve4: PMTU exceptions 1 195 pmtu_ipv4_geneve6_exception IPv4 over geneve6: PMTU exceptions 1 196 pmtu_ipv6_geneve6_exception IPv6 over geneve6: PMTU exceptions 1 197 pmtu_ipv4_br_vxlan4_exception IPv4, bridged vxlan4: PMTU exceptions 1 198 pmtu_ipv6_br_vxlan4_exception IPv6, bridged vxlan4: PMTU exceptions 1 199 pmtu_ipv4_br_vxlan6_exception IPv4, bridged vxlan6: PMTU exceptions 1 200 pmtu_ipv6_br_vxlan6_exception IPv6, bridged vxlan6: PMTU exceptions 1 201 pmtu_ipv4_br_geneve4_exception IPv4, bridged geneve4: PMTU exceptions 1 202 pmtu_ipv6_br_geneve4_exception IPv6, bridged geneve4: PMTU exceptions 1 203 pmtu_ipv4_br_geneve6_exception IPv4, bridged geneve6: PMTU exceptions 1 204 pmtu_ipv6_br_geneve6_exception IPv6, bridged geneve6: PMTU exceptions 1 205 pmtu_ipv4_ovs_vxlan4_exception IPv4, OVS vxlan4: PMTU exceptions 1 206 pmtu_ipv6_ovs_vxlan4_exception IPv6, OVS vxlan4: PMTU exceptions 1 207 pmtu_ipv4_ovs_vxlan6_exception IPv4, OVS vxlan6: PMTU exceptions 1 208 pmtu_ipv6_ovs_vxlan6_exception IPv6, OVS vxlan6: PMTU exceptions 1 209 pmtu_ipv4_ovs_geneve4_exception IPv4, OVS geneve4: PMTU exceptions 1 210 pmtu_ipv6_ovs_geneve4_exception IPv6, OVS geneve4: PMTU exceptions 1 211 pmtu_ipv4_ovs_geneve6_exception IPv4, OVS geneve6: PMTU exceptions 1 212 pmtu_ipv6_ovs_geneve6_exception IPv6, OVS geneve6: PMTU exceptions 1 213 pmtu_ipv4_fou4_exception IPv4 over fou4: PMTU exceptions 1 214 pmtu_ipv6_fou4_exception IPv6 over fou4: PMTU exceptions 1 215 pmtu_ipv4_fou6_exception IPv4 over fou6: PMTU exceptions 1 216 pmtu_ipv6_fou6_exception IPv6 over fou6: PMTU exceptions 1 217 pmtu_ipv4_gue4_exception IPv4 over gue4: PMTU exceptions 1 218 pmtu_ipv6_gue4_exception IPv6 over gue4: PMTU exceptions 1 219 pmtu_ipv4_gue6_exception IPv4 over gue6: PMTU exceptions 1 220 pmtu_ipv6_gue6_exception IPv6 over gue6: PMTU exceptions 1 221 pmtu_ipv4_ipv4_exception IPv4 over IPv4: PMTU exceptions 1 222 pmtu_ipv6_ipv4_exception IPv6 over IPv4: PMTU exceptions 1 223 pmtu_ipv4_ipv6_exception IPv4 over IPv6: PMTU exceptions 1 224 pmtu_ipv6_ipv6_exception IPv6 over IPv6: PMTU exceptions 1 225 pmtu_vti6_exception vti6: PMTU exceptions 0 226 pmtu_vti4_exception vti4: PMTU exceptions 0 227 pmtu_vti4_default_mtu vti4: default MTU assignment 0 228 pmtu_vti6_default_mtu vti6: default MTU assignment 0 229 pmtu_vti4_link_add_mtu vti4: MTU setting on link creation 0 230 pmtu_vti6_link_add_mtu vti6: MTU setting on link creation 0 231 pmtu_vti6_link_change_mtu vti6: MTU changes on link changes 0 232 cleanup_ipv4_exception ipv4: cleanup of cached exceptions 1 233 cleanup_ipv6_exception ipv6: cleanup of cached exceptions 1 234 list_flush_ipv4_exception ipv4: list and flush cached exceptions 1 235 list_flush_ipv6_exception ipv6: list and flush cached exceptions 1 236 pmtu_ipv4_route_change ipv4: PMTU exception w/route replace 1 237 pmtu_ipv6_route_change ipv6: PMTU exception w/route replace 1" 238 239NS_A="ns-A" 240NS_B="ns-B" 241NS_C="ns-C" 242NS_R1="ns-R1" 243NS_R2="ns-R2" 244ns_a="ip netns exec ${NS_A}" 245ns_b="ip netns exec ${NS_B}" 246ns_c="ip netns exec ${NS_C}" 247ns_r1="ip netns exec ${NS_R1}" 248ns_r2="ip netns exec ${NS_R2}" 249 250# Addressing and routing for tests with routers: four network segments, with 251# index SEGMENT between 1 and 4, a common prefix (PREFIX4 or PREFIX6) and an 252# identifier ID, which is 1 for hosts (A and B), 2 for routers (R1 and R2). 253# Addresses are: 254# - IPv4: PREFIX4.SEGMENT.ID (/24) 255# - IPv6: PREFIX6:SEGMENT::ID (/64) 256prefix4="10.0" 257prefix6="fc00" 258a_r1=1 259a_r2=2 260b_r1=3 261b_r2=4 262# ns peer segment 263routing_addrs=" 264 A R1 ${a_r1} 265 A R2 ${a_r2} 266 B R1 ${b_r1} 267 B R2 ${b_r2} 268" 269# Traffic from A to B goes through R1 by default, and through R2, if destined to 270# B's address on the b_r2 segment. 271# Traffic from B to A goes through R1. 272# ns destination gateway 273routes=" 274 A default ${prefix4}.${a_r1}.2 275 A ${prefix4}.${b_r2}.1 ${prefix4}.${a_r2}.2 276 B default ${prefix4}.${b_r1}.2 277 278 A default ${prefix6}:${a_r1}::2 279 A ${prefix6}:${b_r2}::1 ${prefix6}:${a_r2}::2 280 B default ${prefix6}:${b_r1}::2 281" 282 283USE_NH="no" 284# ns family nh id destination gateway 285nexthops=" 286 A 4 41 ${prefix4}.${a_r1}.2 veth_A-R1 287 A 4 42 ${prefix4}.${a_r2}.2 veth_A-R2 288 B 4 41 ${prefix4}.${b_r1}.2 veth_B-R1 289 290 A 6 61 ${prefix6}:${a_r1}::2 veth_A-R1 291 A 6 62 ${prefix6}:${a_r2}::2 veth_A-R2 292 B 6 61 ${prefix6}:${b_r1}::2 veth_B-R1 293" 294 295# nexthop id correlates to id in nexthops config above 296# ns family prefix nh id 297routes_nh=" 298 A 4 default 41 299 A 4 ${prefix4}.${b_r2}.1 42 300 B 4 default 41 301 302 A 6 default 61 303 A 6 ${prefix6}:${b_r2}::1 62 304 B 6 default 61 305" 306 307veth4_a_addr="192.168.1.1" 308veth4_b_addr="192.168.1.2" 309veth4_c_addr="192.168.2.10" 310veth4_mask="24" 311veth6_a_addr="fd00:1::a" 312veth6_b_addr="fd00:1::b" 313veth6_c_addr="fd00:2::c" 314veth6_mask="64" 315 316tunnel4_a_addr="192.168.2.1" 317tunnel4_b_addr="192.168.2.2" 318tunnel4_mask="24" 319tunnel6_a_addr="fd00:2::a" 320tunnel6_b_addr="fd00:2::b" 321tunnel6_mask="64" 322 323dummy6_0_prefix="fc00:1000::" 324dummy6_1_prefix="fc00:1001::" 325dummy6_mask="64" 326 327err_buf= 328tcpdump_pids= 329 330err() { 331 err_buf="${err_buf}${1} 332" 333} 334 335err_flush() { 336 echo -n "${err_buf}" 337 err_buf= 338} 339 340run_cmd() { 341 cmd="$*" 342 343 if [ "$VERBOSE" = "1" ]; then 344 printf " COMMAND: $cmd\n" 345 fi 346 347 out="$($cmd 2>&1)" 348 rc=$? 349 if [ "$VERBOSE" = "1" -a -n "$out" ]; then 350 echo " $out" 351 echo 352 fi 353 354 return $rc 355} 356 357# Find the auto-generated name for this namespace 358nsname() { 359 eval echo \$NS_$1 360} 361 362setup_fou_or_gue() { 363 outer="${1}" 364 inner="${2}" 365 encap="${3}" 366 367 if [ "${outer}" = "4" ]; then 368 modprobe fou || return $ksft_skip 369 a_addr="${prefix4}.${a_r1}.1" 370 b_addr="${prefix4}.${b_r1}.1" 371 if [ "${inner}" = "4" ]; then 372 type="ipip" 373 ipproto="4" 374 else 375 type="sit" 376 ipproto="41" 377 fi 378 else 379 modprobe fou6 || return $ksft_skip 380 a_addr="${prefix6}:${a_r1}::1" 381 b_addr="${prefix6}:${b_r1}::1" 382 if [ "${inner}" = "4" ]; then 383 type="ip6tnl" 384 mode="mode ipip6" 385 ipproto="4 -6" 386 else 387 type="ip6tnl" 388 mode="mode ip6ip6" 389 ipproto="41 -6" 390 fi 391 fi 392 393 run_cmd ${ns_a} ip fou add port 5555 ipproto ${ipproto} || return $ksft_skip 394 run_cmd ${ns_a} ip link add ${encap}_a type ${type} ${mode} local ${a_addr} remote ${b_addr} encap ${encap} encap-sport auto encap-dport 5556 || return $ksft_skip 395 396 run_cmd ${ns_b} ip fou add port 5556 ipproto ${ipproto} 397 run_cmd ${ns_b} ip link add ${encap}_b type ${type} ${mode} local ${b_addr} remote ${a_addr} encap ${encap} encap-sport auto encap-dport 5555 398 399 if [ "${inner}" = "4" ]; then 400 run_cmd ${ns_a} ip addr add ${tunnel4_a_addr}/${tunnel4_mask} dev ${encap}_a 401 run_cmd ${ns_b} ip addr add ${tunnel4_b_addr}/${tunnel4_mask} dev ${encap}_b 402 else 403 run_cmd ${ns_a} ip addr add ${tunnel6_a_addr}/${tunnel6_mask} dev ${encap}_a 404 run_cmd ${ns_b} ip addr add ${tunnel6_b_addr}/${tunnel6_mask} dev ${encap}_b 405 fi 406 407 run_cmd ${ns_a} ip link set ${encap}_a up 408 run_cmd ${ns_b} ip link set ${encap}_b up 409} 410 411setup_fou44() { 412 setup_fou_or_gue 4 4 fou 413} 414 415setup_fou46() { 416 setup_fou_or_gue 4 6 fou 417} 418 419setup_fou64() { 420 setup_fou_or_gue 6 4 fou 421} 422 423setup_fou66() { 424 setup_fou_or_gue 6 6 fou 425} 426 427setup_gue44() { 428 setup_fou_or_gue 4 4 gue 429} 430 431setup_gue46() { 432 setup_fou_or_gue 4 6 gue 433} 434 435setup_gue64() { 436 setup_fou_or_gue 6 4 gue 437} 438 439setup_gue66() { 440 setup_fou_or_gue 6 6 gue 441} 442 443setup_ipvX_over_ipvY() { 444 inner=${1} 445 outer=${2} 446 447 if [ "${outer}" -eq 4 ]; then 448 a_addr="${prefix4}.${a_r1}.1" 449 b_addr="${prefix4}.${b_r1}.1" 450 if [ "${inner}" -eq 4 ]; then 451 type="ipip" 452 mode="ipip" 453 else 454 type="sit" 455 mode="ip6ip" 456 fi 457 else 458 a_addr="${prefix6}:${a_r1}::1" 459 b_addr="${prefix6}:${b_r1}::1" 460 type="ip6tnl" 461 if [ "${inner}" -eq 4 ]; then 462 mode="ipip6" 463 else 464 mode="ip6ip6" 465 fi 466 fi 467 468 run_cmd ${ns_a} ip link add ip_a type ${type} local ${a_addr} remote ${b_addr} mode ${mode} || return $ksft_skip 469 run_cmd ${ns_b} ip link add ip_b type ${type} local ${b_addr} remote ${a_addr} mode ${mode} 470 471 run_cmd ${ns_a} ip link set ip_a up 472 run_cmd ${ns_b} ip link set ip_b up 473 474 if [ "${inner}" = "4" ]; then 475 run_cmd ${ns_a} ip addr add ${tunnel4_a_addr}/${tunnel4_mask} dev ip_a 476 run_cmd ${ns_b} ip addr add ${tunnel4_b_addr}/${tunnel4_mask} dev ip_b 477 else 478 run_cmd ${ns_a} ip addr add ${tunnel6_a_addr}/${tunnel6_mask} dev ip_a 479 run_cmd ${ns_b} ip addr add ${tunnel6_b_addr}/${tunnel6_mask} dev ip_b 480 fi 481} 482 483setup_ip4ip4() { 484 setup_ipvX_over_ipvY 4 4 485} 486 487setup_ip6ip4() { 488 setup_ipvX_over_ipvY 6 4 489} 490 491setup_ip4ip6() { 492 setup_ipvX_over_ipvY 4 6 493} 494 495setup_ip6ip6() { 496 setup_ipvX_over_ipvY 6 6 497} 498 499setup_namespaces() { 500 for n in ${NS_A} ${NS_B} ${NS_C} ${NS_R1} ${NS_R2}; do 501 ip netns add ${n} || return 1 502 503 # Disable DAD, so that we don't have to wait to use the 504 # configured IPv6 addresses 505 ip netns exec ${n} sysctl -q net/ipv6/conf/default/accept_dad=0 506 done 507} 508 509setup_veth() { 510 run_cmd ${ns_a} ip link add veth_a type veth peer name veth_b || return 1 511 run_cmd ${ns_a} ip link set veth_b netns ${NS_B} 512 513 run_cmd ${ns_a} ip addr add ${veth4_a_addr}/${veth4_mask} dev veth_a 514 run_cmd ${ns_b} ip addr add ${veth4_b_addr}/${veth4_mask} dev veth_b 515 516 run_cmd ${ns_a} ip addr add ${veth6_a_addr}/${veth6_mask} dev veth_a 517 run_cmd ${ns_b} ip addr add ${veth6_b_addr}/${veth6_mask} dev veth_b 518 519 run_cmd ${ns_a} ip link set veth_a up 520 run_cmd ${ns_b} ip link set veth_b up 521} 522 523setup_vti() { 524 proto=${1} 525 veth_a_addr="${2}" 526 veth_b_addr="${3}" 527 vti_a_addr="${4}" 528 vti_b_addr="${5}" 529 vti_mask=${6} 530 531 [ ${proto} -eq 6 ] && vti_type="vti6" || vti_type="vti" 532 533 run_cmd ${ns_a} ip link add vti${proto}_a type ${vti_type} local ${veth_a_addr} remote ${veth_b_addr} key 10 || return 1 534 run_cmd ${ns_b} ip link add vti${proto}_b type ${vti_type} local ${veth_b_addr} remote ${veth_a_addr} key 10 535 536 run_cmd ${ns_a} ip addr add ${vti_a_addr}/${vti_mask} dev vti${proto}_a 537 run_cmd ${ns_b} ip addr add ${vti_b_addr}/${vti_mask} dev vti${proto}_b 538 539 run_cmd ${ns_a} ip link set vti${proto}_a up 540 run_cmd ${ns_b} ip link set vti${proto}_b up 541} 542 543setup_vti4() { 544 setup_vti 4 ${veth4_a_addr} ${veth4_b_addr} ${tunnel4_a_addr} ${tunnel4_b_addr} ${tunnel4_mask} 545} 546 547setup_vti6() { 548 setup_vti 6 ${veth6_a_addr} ${veth6_b_addr} ${tunnel6_a_addr} ${tunnel6_b_addr} ${tunnel6_mask} 549} 550 551setup_vxlan_or_geneve() { 552 type="${1}" 553 a_addr="${2}" 554 b_addr="${3}" 555 opts="${4}" 556 br_if_a="${5}" 557 558 if [ "${type}" = "vxlan" ]; then 559 opts="${opts} ttl 64 dstport 4789" 560 opts_a="local ${a_addr}" 561 opts_b="local ${b_addr}" 562 else 563 opts_a="" 564 opts_b="" 565 fi 566 567 run_cmd ${ns_a} ip link add ${type}_a type ${type} id 1 ${opts_a} remote ${b_addr} ${opts} || return 1 568 run_cmd ${ns_b} ip link add ${type}_b type ${type} id 1 ${opts_b} remote ${a_addr} ${opts} 569 570 if [ -n "${br_if_a}" ]; then 571 run_cmd ${ns_a} ip addr add ${tunnel4_a_addr}/${tunnel4_mask} dev ${br_if_a} 572 run_cmd ${ns_a} ip addr add ${tunnel6_a_addr}/${tunnel6_mask} dev ${br_if_a} 573 run_cmd ${ns_a} ip link set ${type}_a master ${br_if_a} 574 else 575 run_cmd ${ns_a} ip addr add ${tunnel4_a_addr}/${tunnel4_mask} dev ${type}_a 576 run_cmd ${ns_a} ip addr add ${tunnel6_a_addr}/${tunnel6_mask} dev ${type}_a 577 fi 578 579 run_cmd ${ns_b} ip addr add ${tunnel4_b_addr}/${tunnel4_mask} dev ${type}_b 580 run_cmd ${ns_b} ip addr add ${tunnel6_b_addr}/${tunnel6_mask} dev ${type}_b 581 582 run_cmd ${ns_a} ip link set ${type}_a up 583 run_cmd ${ns_b} ip link set ${type}_b up 584} 585 586setup_geneve4() { 587 setup_vxlan_or_geneve geneve ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1 "df set" 588} 589 590setup_vxlan4() { 591 setup_vxlan_or_geneve vxlan ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1 "df set" 592} 593 594setup_geneve6() { 595 setup_vxlan_or_geneve geneve ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 "" 596} 597 598setup_vxlan6() { 599 setup_vxlan_or_geneve vxlan ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 "" 600} 601 602setup_bridged_geneve4() { 603 setup_vxlan_or_geneve geneve ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1 "df set" "br0" 604} 605 606setup_bridged_vxlan4() { 607 setup_vxlan_or_geneve vxlan ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1 "df set" "br0" 608} 609 610setup_bridged_geneve6() { 611 setup_vxlan_or_geneve geneve ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 "" "br0" 612} 613 614setup_bridged_vxlan6() { 615 setup_vxlan_or_geneve vxlan ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 "" "br0" 616} 617 618setup_xfrm() { 619 proto=${1} 620 veth_a_addr="${2}" 621 veth_b_addr="${3}" 622 623 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 1 624 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 625 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 626 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 627 628 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 629 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 630 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 631 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 632} 633 634setup_xfrm4() { 635 setup_xfrm 4 ${veth4_a_addr} ${veth4_b_addr} 636} 637 638setup_xfrm6() { 639 setup_xfrm 6 ${veth6_a_addr} ${veth6_b_addr} 640} 641 642setup_routing_old() { 643 for i in ${routes}; do 644 [ "${ns}" = "" ] && ns="${i}" && continue 645 [ "${addr}" = "" ] && addr="${i}" && continue 646 [ "${gw}" = "" ] && gw="${i}" 647 648 ns_name="$(nsname ${ns})" 649 650 ip -n ${ns_name} route add ${addr} via ${gw} 651 652 ns=""; addr=""; gw="" 653 done 654} 655 656setup_routing_new() { 657 for i in ${nexthops}; do 658 [ "${ns}" = "" ] && ns="${i}" && continue 659 [ "${fam}" = "" ] && fam="${i}" && continue 660 [ "${nhid}" = "" ] && nhid="${i}" && continue 661 [ "${gw}" = "" ] && gw="${i}" && continue 662 [ "${dev}" = "" ] && dev="${i}" 663 664 ns_name="$(nsname ${ns})" 665 666 ip -n ${ns_name} -${fam} nexthop add id ${nhid} via ${gw} dev ${dev} 667 668 ns=""; fam=""; nhid=""; gw=""; dev="" 669 670 done 671 672 for i in ${routes_nh}; do 673 [ "${ns}" = "" ] && ns="${i}" && continue 674 [ "${fam}" = "" ] && fam="${i}" && continue 675 [ "${addr}" = "" ] && addr="${i}" && continue 676 [ "${nhid}" = "" ] && nhid="${i}" 677 678 ns_name="$(nsname ${ns})" 679 680 ip -n ${ns_name} -${fam} route add ${addr} nhid ${nhid} 681 682 ns=""; fam=""; addr=""; nhid="" 683 done 684} 685 686setup_routing() { 687 for i in ${NS_R1} ${NS_R2}; do 688 ip netns exec ${i} sysctl -q net/ipv4/ip_forward=1 689 ip netns exec ${i} sysctl -q net/ipv6/conf/all/forwarding=1 690 done 691 692 for i in ${routing_addrs}; do 693 [ "${ns}" = "" ] && ns="${i}" && continue 694 [ "${peer}" = "" ] && peer="${i}" && continue 695 [ "${segment}" = "" ] && segment="${i}" 696 697 ns_name="$(nsname ${ns})" 698 peer_name="$(nsname ${peer})" 699 if="veth_${ns}-${peer}" 700 ifpeer="veth_${peer}-${ns}" 701 702 # Create veth links 703 ip link add ${if} up netns ${ns_name} type veth peer name ${ifpeer} netns ${peer_name} || return 1 704 ip -n ${peer_name} link set dev ${ifpeer} up 705 706 # Add addresses 707 ip -n ${ns_name} addr add ${prefix4}.${segment}.1/24 dev ${if} 708 ip -n ${ns_name} addr add ${prefix6}:${segment}::1/64 dev ${if} 709 710 ip -n ${peer_name} addr add ${prefix4}.${segment}.2/24 dev ${ifpeer} 711 ip -n ${peer_name} addr add ${prefix6}:${segment}::2/64 dev ${ifpeer} 712 713 ns=""; peer=""; segment="" 714 done 715 716 if [ "$USE_NH" = "yes" ]; then 717 setup_routing_new 718 else 719 setup_routing_old 720 fi 721 722 return 0 723} 724 725setup_bridge() { 726 run_cmd ${ns_a} ip link add br0 type bridge || return $ksft_skip 727 run_cmd ${ns_a} ip link set br0 up 728 729 run_cmd ${ns_c} ip link add veth_C-A type veth peer name veth_A-C 730 run_cmd ${ns_c} ip link set veth_A-C netns ns-A 731 732 run_cmd ${ns_a} ip link set veth_A-C up 733 run_cmd ${ns_c} ip link set veth_C-A up 734 run_cmd ${ns_c} ip addr add ${veth4_c_addr}/${veth4_mask} dev veth_C-A 735 run_cmd ${ns_c} ip addr add ${veth6_c_addr}/${veth6_mask} dev veth_C-A 736 run_cmd ${ns_a} ip link set veth_A-C master br0 737} 738 739setup_ovs_vxlan_or_geneve() { 740 type="${1}" 741 a_addr="${2}" 742 b_addr="${3}" 743 744 if [ "${type}" = "vxlan" ]; then 745 opts="${opts} ttl 64 dstport 4789" 746 opts_b="local ${b_addr}" 747 fi 748 749 run_cmd ovs-vsctl add-port ovs_br0 ${type}_a -- \ 750 set interface ${type}_a type=${type} \ 751 options:remote_ip=${b_addr} options:key=1 options:csum=true || return 1 752 753 run_cmd ${ns_b} ip link add ${type}_b type ${type} id 1 ${opts_b} remote ${a_addr} ${opts} || return 1 754 755 run_cmd ${ns_b} ip addr add ${tunnel4_b_addr}/${tunnel4_mask} dev ${type}_b 756 run_cmd ${ns_b} ip addr add ${tunnel6_b_addr}/${tunnel6_mask} dev ${type}_b 757 758 run_cmd ${ns_b} ip link set ${type}_b up 759} 760 761setup_ovs_geneve4() { 762 setup_ovs_vxlan_or_geneve geneve ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1 763} 764 765setup_ovs_vxlan4() { 766 setup_ovs_vxlan_or_geneve vxlan ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1 767} 768 769setup_ovs_geneve6() { 770 setup_ovs_vxlan_or_geneve geneve ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 771} 772 773setup_ovs_vxlan6() { 774 setup_ovs_vxlan_or_geneve vxlan ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 775} 776 777setup_ovs_bridge() { 778 run_cmd ovs-vsctl add-br ovs_br0 || return $ksft_skip 779 run_cmd ip link set ovs_br0 up 780 781 run_cmd ${ns_c} ip link add veth_C-A type veth peer name veth_A-C 782 run_cmd ${ns_c} ip link set veth_A-C netns 1 783 784 run_cmd ip link set veth_A-C up 785 run_cmd ${ns_c} ip link set veth_C-A up 786 run_cmd ${ns_c} ip addr add ${veth4_c_addr}/${veth4_mask} dev veth_C-A 787 run_cmd ${ns_c} ip addr add ${veth6_c_addr}/${veth6_mask} dev veth_C-A 788 run_cmd ovs-vsctl add-port ovs_br0 veth_A-C 789 790 # Move veth_A-R1 to init 791 run_cmd ${ns_a} ip link set veth_A-R1 netns 1 792 run_cmd ip addr add ${prefix4}.${a_r1}.1/${veth4_mask} dev veth_A-R1 793 run_cmd ip addr add ${prefix6}:${a_r1}::1/${veth6_mask} dev veth_A-R1 794 run_cmd ip link set veth_A-R1 up 795 run_cmd ip route add ${prefix4}.${b_r1}.1 via ${prefix4}.${a_r1}.2 796 run_cmd ip route add ${prefix6}:${b_r1}::1 via ${prefix6}:${a_r1}::2 797} 798 799setup() { 800 [ "$(id -u)" -ne 0 ] && echo " need to run as root" && return $ksft_skip 801 802 cleanup 803 for arg do 804 eval setup_${arg} || { echo " ${arg} not supported"; return 1; } 805 done 806} 807 808trace() { 809 [ $TRACING -eq 0 ] && return 810 811 for arg do 812 [ "${ns_cmd}" = "" ] && ns_cmd="${arg}" && continue 813 ${ns_cmd} tcpdump -s 0 -i "${arg}" -w "${name}_${arg}.pcap" 2> /dev/null & 814 tcpdump_pids="${tcpdump_pids} $!" 815 ns_cmd= 816 done 817 sleep 1 818} 819 820cleanup() { 821 for pid in ${tcpdump_pids}; do 822 kill ${pid} 823 done 824 tcpdump_pids= 825 826 for n in ${NS_A} ${NS_B} ${NS_C} ${NS_R1} ${NS_R2}; do 827 ip netns del ${n} 2> /dev/null 828 done 829 830 ip link del veth_A-C 2>/dev/null 831 ip link del veth_A-R1 2>/dev/null 832 ovs-vsctl --if-exists del-port vxlan_a 2>/dev/null 833 ovs-vsctl --if-exists del-br ovs_br0 2>/dev/null 834} 835 836mtu() { 837 ns_cmd="${1}" 838 dev="${2}" 839 mtu="${3}" 840 841 ${ns_cmd} ip link set dev ${dev} mtu ${mtu} 842} 843 844mtu_parse() { 845 input="${1}" 846 847 next=0 848 for i in ${input}; do 849 [ ${next} -eq 1 -a "${i}" = "lock" ] && next=2 && continue 850 [ ${next} -eq 1 ] && echo "${i}" && return 851 [ ${next} -eq 2 ] && echo "lock ${i}" && return 852 [ "${i}" = "mtu" ] && next=1 853 done 854} 855 856link_get() { 857 ns_cmd="${1}" 858 name="${2}" 859 860 ${ns_cmd} ip link show dev "${name}" 861} 862 863link_get_mtu() { 864 ns_cmd="${1}" 865 name="${2}" 866 867 mtu_parse "$(link_get "${ns_cmd}" ${name})" 868} 869 870route_get_dst_exception() { 871 ns_cmd="${1}" 872 dst="${2}" 873 874 ${ns_cmd} ip route get "${dst}" 875} 876 877route_get_dst_pmtu_from_exception() { 878 ns_cmd="${1}" 879 dst="${2}" 880 881 mtu_parse "$(route_get_dst_exception "${ns_cmd}" ${dst})" 882} 883 884check_pmtu_value() { 885 expected="${1}" 886 value="${2}" 887 event="${3}" 888 889 [ "${expected}" = "any" ] && [ -n "${value}" ] && return 0 890 [ "${value}" = "${expected}" ] && return 0 891 [ -z "${value}" ] && err " PMTU exception wasn't created after ${event}" && return 1 892 [ -z "${expected}" ] && err " PMTU exception shouldn't exist after ${event}" && return 1 893 err " found PMTU exception with incorrect MTU ${value}, expected ${expected}, after ${event}" 894 return 1 895} 896 897test_pmtu_ipvX() { 898 family=${1} 899 900 setup namespaces routing || return $ksft_skip 901 trace "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \ 902 "${ns_r1}" veth_R1-B "${ns_b}" veth_B-R1 \ 903 "${ns_a}" veth_A-R2 "${ns_r2}" veth_R2-A \ 904 "${ns_r2}" veth_R2-B "${ns_b}" veth_B-R2 905 906 if [ ${family} -eq 4 ]; then 907 ping=ping 908 dst1="${prefix4}.${b_r1}.1" 909 dst2="${prefix4}.${b_r2}.1" 910 else 911 ping=${ping6} 912 dst1="${prefix6}:${b_r1}::1" 913 dst2="${prefix6}:${b_r2}::1" 914 fi 915 916 # Set up initial MTU values 917 mtu "${ns_a}" veth_A-R1 2000 918 mtu "${ns_r1}" veth_R1-A 2000 919 mtu "${ns_r1}" veth_R1-B 1400 920 mtu "${ns_b}" veth_B-R1 1400 921 922 mtu "${ns_a}" veth_A-R2 2000 923 mtu "${ns_r2}" veth_R2-A 2000 924 mtu "${ns_r2}" veth_R2-B 1500 925 mtu "${ns_b}" veth_B-R2 1500 926 927 # Create route exceptions 928 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1800 ${dst1} 929 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1800 ${dst2} 930 931 # Check that exceptions have been created with the correct PMTU 932 pmtu_1="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst1})" 933 check_pmtu_value "1400" "${pmtu_1}" "exceeding MTU" || return 1 934 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})" 935 check_pmtu_value "1500" "${pmtu_2}" "exceeding MTU" || return 1 936 937 # Decrease local MTU below PMTU, check for PMTU decrease in route exception 938 mtu "${ns_a}" veth_A-R1 1300 939 mtu "${ns_r1}" veth_R1-A 1300 940 pmtu_1="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst1})" 941 check_pmtu_value "1300" "${pmtu_1}" "decreasing local MTU" || return 1 942 # Second exception shouldn't be modified 943 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})" 944 check_pmtu_value "1500" "${pmtu_2}" "changing local MTU on a link not on this path" || return 1 945 946 # Increase MTU, check for PMTU increase in route exception 947 mtu "${ns_a}" veth_A-R1 1700 948 mtu "${ns_r1}" veth_R1-A 1700 949 pmtu_1="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst1})" 950 check_pmtu_value "1700" "${pmtu_1}" "increasing local MTU" || return 1 951 # Second exception shouldn't be modified 952 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})" 953 check_pmtu_value "1500" "${pmtu_2}" "changing local MTU on a link not on this path" || return 1 954 955 # Skip PMTU locking tests for IPv6 956 [ $family -eq 6 ] && return 0 957 958 # Decrease remote MTU on path via R2, get new exception 959 mtu "${ns_r2}" veth_R2-B 400 960 mtu "${ns_b}" veth_B-R2 400 961 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1400 ${dst2} 962 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})" 963 check_pmtu_value "lock 552" "${pmtu_2}" "exceeding MTU, with MTU < min_pmtu" || return 1 964 965 # Decrease local MTU below PMTU 966 mtu "${ns_a}" veth_A-R2 500 967 mtu "${ns_r2}" veth_R2-A 500 968 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})" 969 check_pmtu_value "500" "${pmtu_2}" "decreasing local MTU" || return 1 970 971 # Increase local MTU 972 mtu "${ns_a}" veth_A-R2 1500 973 mtu "${ns_r2}" veth_R2-A 1500 974 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})" 975 check_pmtu_value "1500" "${pmtu_2}" "increasing local MTU" || return 1 976 977 # Get new exception 978 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1400 ${dst2} 979 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})" 980 check_pmtu_value "lock 552" "${pmtu_2}" "exceeding MTU, with MTU < min_pmtu" || return 1 981} 982 983test_pmtu_ipv4_exception() { 984 test_pmtu_ipvX 4 985} 986 987test_pmtu_ipv6_exception() { 988 test_pmtu_ipvX 6 989} 990 991test_pmtu_ipvX_over_vxlanY_or_geneveY_exception() { 992 type=${1} 993 family=${2} 994 outer_family=${3} 995 ll_mtu=4000 996 997 if [ ${outer_family} -eq 4 ]; then 998 setup namespaces routing ${type}4 || return $ksft_skip 999 # IPv4 header UDP header VXLAN/GENEVE header Ethernet header 1000 exp_mtu=$((${ll_mtu} - 20 - 8 - 8 - 14)) 1001 else 1002 setup namespaces routing ${type}6 || return $ksft_skip 1003 # IPv6 header UDP header VXLAN/GENEVE header Ethernet header 1004 exp_mtu=$((${ll_mtu} - 40 - 8 - 8 - 14)) 1005 fi 1006 1007 trace "${ns_a}" ${type}_a "${ns_b}" ${type}_b \ 1008 "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \ 1009 "${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B 1010 1011 if [ ${family} -eq 4 ]; then 1012 ping=ping 1013 dst=${tunnel4_b_addr} 1014 else 1015 ping=${ping6} 1016 dst=${tunnel6_b_addr} 1017 fi 1018 1019 # Create route exception by exceeding link layer MTU 1020 mtu "${ns_a}" veth_A-R1 $((${ll_mtu} + 1000)) 1021 mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000)) 1022 mtu "${ns_b}" veth_B-R1 ${ll_mtu} 1023 mtu "${ns_r1}" veth_R1-B ${ll_mtu} 1024 1025 mtu "${ns_a}" ${type}_a $((${ll_mtu} + 1000)) 1026 mtu "${ns_b}" ${type}_b $((${ll_mtu} + 1000)) 1027 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${dst} 1028 1029 # Check that exception was created 1030 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst})" 1031 check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on ${type} interface" 1032} 1033 1034test_pmtu_ipv4_vxlan4_exception() { 1035 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception vxlan 4 4 1036} 1037 1038test_pmtu_ipv6_vxlan4_exception() { 1039 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception vxlan 6 4 1040} 1041 1042test_pmtu_ipv4_geneve4_exception() { 1043 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception geneve 4 4 1044} 1045 1046test_pmtu_ipv6_geneve4_exception() { 1047 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception geneve 6 4 1048} 1049 1050test_pmtu_ipv4_vxlan6_exception() { 1051 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception vxlan 4 6 1052} 1053 1054test_pmtu_ipv6_vxlan6_exception() { 1055 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception vxlan 6 6 1056} 1057 1058test_pmtu_ipv4_geneve6_exception() { 1059 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception geneve 4 6 1060} 1061 1062test_pmtu_ipv6_geneve6_exception() { 1063 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception geneve 6 6 1064} 1065 1066test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception() { 1067 type=${1} 1068 family=${2} 1069 outer_family=${3} 1070 ll_mtu=4000 1071 1072 if [ ${outer_family} -eq 4 ]; then 1073 setup namespaces routing bridge bridged_${type}4 || return $ksft_skip 1074 # IPv4 header UDP header VXLAN/GENEVE header Ethernet header 1075 exp_mtu=$((${ll_mtu} - 20 - 8 - 8 - 14)) 1076 else 1077 setup namespaces routing bridge bridged_${type}6 || return $ksft_skip 1078 # IPv6 header UDP header VXLAN/GENEVE header Ethernet header 1079 exp_mtu=$((${ll_mtu} - 40 - 8 - 8 - 14)) 1080 fi 1081 1082 trace "${ns_a}" ${type}_a "${ns_b}" ${type}_b \ 1083 "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \ 1084 "${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B \ 1085 "${ns_a}" br0 "${ns_a}" veth-A-C \ 1086 "${ns_c}" veth_C-A 1087 1088 if [ ${family} -eq 4 ]; then 1089 ping=ping 1090 dst=${tunnel4_b_addr} 1091 else 1092 ping=${ping6} 1093 dst=${tunnel6_b_addr} 1094 fi 1095 1096 # Create route exception by exceeding link layer MTU 1097 mtu "${ns_a}" veth_A-R1 $((${ll_mtu} + 1000)) 1098 mtu "${ns_a}" br0 $((${ll_mtu} + 1000)) 1099 mtu "${ns_a}" veth_A-C $((${ll_mtu} + 1000)) 1100 mtu "${ns_c}" veth_C-A $((${ll_mtu} + 1000)) 1101 mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000)) 1102 mtu "${ns_b}" veth_B-R1 ${ll_mtu} 1103 mtu "${ns_r1}" veth_R1-B ${ll_mtu} 1104 1105 mtu "${ns_a}" ${type}_a $((${ll_mtu} + 1000)) 1106 mtu "${ns_b}" ${type}_b $((${ll_mtu} + 1000)) 1107 1108 run_cmd ${ns_c} ${ping} -q -M want -i 0.1 -c 10 -s $((${ll_mtu} + 500)) ${dst} || return 1 1109 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${dst} || return 1 1110 1111 # Check that exceptions were created 1112 pmtu="$(route_get_dst_pmtu_from_exception "${ns_c}" ${dst})" 1113 check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on bridged ${type} interface" 1114 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst})" 1115 check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on locally bridged ${type} interface" 1116} 1117 1118test_pmtu_ipv4_br_vxlan4_exception() { 1119 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception vxlan 4 4 1120} 1121 1122test_pmtu_ipv6_br_vxlan4_exception() { 1123 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception vxlan 6 4 1124} 1125 1126test_pmtu_ipv4_br_geneve4_exception() { 1127 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception geneve 4 4 1128} 1129 1130test_pmtu_ipv6_br_geneve4_exception() { 1131 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception geneve 6 4 1132} 1133 1134test_pmtu_ipv4_br_vxlan6_exception() { 1135 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception vxlan 4 6 1136} 1137 1138test_pmtu_ipv6_br_vxlan6_exception() { 1139 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception vxlan 6 6 1140} 1141 1142test_pmtu_ipv4_br_geneve6_exception() { 1143 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception geneve 4 6 1144} 1145 1146test_pmtu_ipv6_br_geneve6_exception() { 1147 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception geneve 6 6 1148} 1149 1150test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception() { 1151 type=${1} 1152 family=${2} 1153 outer_family=${3} 1154 ll_mtu=4000 1155 1156 if [ ${outer_family} -eq 4 ]; then 1157 setup namespaces routing ovs_bridge ovs_${type}4 || return $ksft_skip 1158 # IPv4 header UDP header VXLAN/GENEVE header Ethernet header 1159 exp_mtu=$((${ll_mtu} - 20 - 8 - 8 - 14)) 1160 else 1161 setup namespaces routing ovs_bridge ovs_${type}6 || return $ksft_skip 1162 # IPv6 header UDP header VXLAN/GENEVE header Ethernet header 1163 exp_mtu=$((${ll_mtu} - 40 - 8 - 8 - 14)) 1164 fi 1165 1166 if [ "${type}" = "vxlan" ]; then 1167 tun_a="vxlan_sys_4789" 1168 elif [ "${type}" = "geneve" ]; then 1169 tun_a="genev_sys_6081" 1170 fi 1171 1172 trace "" "${tun_a}" "${ns_b}" ${type}_b \ 1173 "" veth_A-R1 "${ns_r1}" veth_R1-A \ 1174 "${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B \ 1175 "" ovs_br0 "" veth-A-C \ 1176 "${ns_c}" veth_C-A 1177 1178 if [ ${family} -eq 4 ]; then 1179 ping=ping 1180 dst=${tunnel4_b_addr} 1181 else 1182 ping=${ping6} 1183 dst=${tunnel6_b_addr} 1184 fi 1185 1186 # Create route exception by exceeding link layer MTU 1187 mtu "" veth_A-R1 $((${ll_mtu} + 1000)) 1188 mtu "" ovs_br0 $((${ll_mtu} + 1000)) 1189 mtu "" veth_A-C $((${ll_mtu} + 1000)) 1190 mtu "${ns_c}" veth_C-A $((${ll_mtu} + 1000)) 1191 mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000)) 1192 mtu "${ns_b}" veth_B-R1 ${ll_mtu} 1193 mtu "${ns_r1}" veth_R1-B ${ll_mtu} 1194 1195 mtu "" ${tun_a} $((${ll_mtu} + 1000)) 1196 mtu "${ns_b}" ${type}_b $((${ll_mtu} + 1000)) 1197 1198 run_cmd ${ns_c} ${ping} -q -M want -i 0.1 -c 20 -s $((${ll_mtu} + 500)) ${dst} || return 1 1199 1200 # Check that exceptions were created 1201 pmtu="$(route_get_dst_pmtu_from_exception "${ns_c}" ${dst})" 1202 check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on Open vSwitch ${type} interface" 1203} 1204 1205test_pmtu_ipv4_ovs_vxlan4_exception() { 1206 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception vxlan 4 4 1207} 1208 1209test_pmtu_ipv6_ovs_vxlan4_exception() { 1210 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception vxlan 6 4 1211} 1212 1213test_pmtu_ipv4_ovs_geneve4_exception() { 1214 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception geneve 4 4 1215} 1216 1217test_pmtu_ipv6_ovs_geneve4_exception() { 1218 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception geneve 6 4 1219} 1220 1221test_pmtu_ipv4_ovs_vxlan6_exception() { 1222 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception vxlan 4 6 1223} 1224 1225test_pmtu_ipv6_ovs_vxlan6_exception() { 1226 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception vxlan 6 6 1227} 1228 1229test_pmtu_ipv4_ovs_geneve6_exception() { 1230 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception geneve 4 6 1231} 1232 1233test_pmtu_ipv6_ovs_geneve6_exception() { 1234 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception geneve 6 6 1235} 1236 1237test_pmtu_ipvX_over_fouY_or_gueY() { 1238 inner_family=${1} 1239 outer_family=${2} 1240 encap=${3} 1241 ll_mtu=4000 1242 1243 setup namespaces routing ${encap}${outer_family}${inner_family} || return $ksft_skip 1244 trace "${ns_a}" ${encap}_a "${ns_b}" ${encap}_b \ 1245 "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \ 1246 "${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B 1247 1248 if [ ${inner_family} -eq 4 ]; then 1249 ping=ping 1250 dst=${tunnel4_b_addr} 1251 else 1252 ping=${ping6} 1253 dst=${tunnel6_b_addr} 1254 fi 1255 1256 if [ "${encap}" = "gue" ]; then 1257 encap_overhead=4 1258 else 1259 encap_overhead=0 1260 fi 1261 1262 if [ ${outer_family} -eq 4 ]; then 1263 # IPv4 header UDP header 1264 exp_mtu=$((${ll_mtu} - 20 - 8 - ${encap_overhead})) 1265 else 1266 # IPv6 header Option 4 UDP header 1267 exp_mtu=$((${ll_mtu} - 40 - 8 - 8 - ${encap_overhead})) 1268 fi 1269 1270 # Create route exception by exceeding link layer MTU 1271 mtu "${ns_a}" veth_A-R1 $((${ll_mtu} + 1000)) 1272 mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000)) 1273 mtu "${ns_b}" veth_B-R1 ${ll_mtu} 1274 mtu "${ns_r1}" veth_R1-B ${ll_mtu} 1275 1276 mtu "${ns_a}" ${encap}_a $((${ll_mtu} + 1000)) 1277 mtu "${ns_b}" ${encap}_b $((${ll_mtu} + 1000)) 1278 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${dst} 1279 1280 # Check that exception was created 1281 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst})" 1282 check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on ${encap} interface" 1283} 1284 1285test_pmtu_ipv4_fou4_exception() { 1286 test_pmtu_ipvX_over_fouY_or_gueY 4 4 fou 1287} 1288 1289test_pmtu_ipv6_fou4_exception() { 1290 test_pmtu_ipvX_over_fouY_or_gueY 6 4 fou 1291} 1292 1293test_pmtu_ipv4_fou6_exception() { 1294 test_pmtu_ipvX_over_fouY_or_gueY 4 6 fou 1295} 1296 1297test_pmtu_ipv6_fou6_exception() { 1298 test_pmtu_ipvX_over_fouY_or_gueY 6 6 fou 1299} 1300 1301test_pmtu_ipv4_gue4_exception() { 1302 test_pmtu_ipvX_over_fouY_or_gueY 4 4 gue 1303} 1304 1305test_pmtu_ipv6_gue4_exception() { 1306 test_pmtu_ipvX_over_fouY_or_gueY 6 4 gue 1307} 1308 1309test_pmtu_ipv4_gue6_exception() { 1310 test_pmtu_ipvX_over_fouY_or_gueY 4 6 gue 1311} 1312 1313test_pmtu_ipv6_gue6_exception() { 1314 test_pmtu_ipvX_over_fouY_or_gueY 6 6 gue 1315} 1316 1317test_pmtu_ipvX_over_ipvY_exception() { 1318 inner=${1} 1319 outer=${2} 1320 ll_mtu=4000 1321 1322 setup namespaces routing ip${inner}ip${outer} || return $ksft_skip 1323 1324 trace "${ns_a}" ip_a "${ns_b}" ip_b \ 1325 "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \ 1326 "${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B 1327 1328 if [ ${inner} -eq 4 ]; then 1329 ping=ping 1330 dst=${tunnel4_b_addr} 1331 else 1332 ping=${ping6} 1333 dst=${tunnel6_b_addr} 1334 fi 1335 1336 if [ ${outer} -eq 4 ]; then 1337 # IPv4 header 1338 exp_mtu=$((${ll_mtu} - 20)) 1339 else 1340 # IPv6 header Option 4 1341 exp_mtu=$((${ll_mtu} - 40 - 8)) 1342 fi 1343 1344 # Create route exception by exceeding link layer MTU 1345 mtu "${ns_a}" veth_A-R1 $((${ll_mtu} + 1000)) 1346 mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000)) 1347 mtu "${ns_b}" veth_B-R1 ${ll_mtu} 1348 mtu "${ns_r1}" veth_R1-B ${ll_mtu} 1349 1350 mtu "${ns_a}" ip_a $((${ll_mtu} + 1000)) || return 1351 mtu "${ns_b}" ip_b $((${ll_mtu} + 1000)) || return 1352 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${dst} 1353 1354 # Check that exception was created 1355 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst})" 1356 check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on ip${inner}ip${outer} interface" 1357} 1358 1359test_pmtu_ipv4_ipv4_exception() { 1360 test_pmtu_ipvX_over_ipvY_exception 4 4 1361} 1362 1363test_pmtu_ipv6_ipv4_exception() { 1364 test_pmtu_ipvX_over_ipvY_exception 6 4 1365} 1366 1367test_pmtu_ipv4_ipv6_exception() { 1368 test_pmtu_ipvX_over_ipvY_exception 4 6 1369} 1370 1371test_pmtu_ipv6_ipv6_exception() { 1372 test_pmtu_ipvX_over_ipvY_exception 6 6 1373} 1374 1375test_pmtu_vti4_exception() { 1376 setup namespaces veth vti4 xfrm4 || return $ksft_skip 1377 trace "${ns_a}" veth_a "${ns_b}" veth_b \ 1378 "${ns_a}" vti4_a "${ns_b}" vti4_b 1379 1380 veth_mtu=1500 1381 vti_mtu=$((veth_mtu - 20)) 1382 1383 # SPI SN IV ICV pad length next header 1384 esp_payload_rfc4106=$((vti_mtu - 4 - 4 - 8 - 16 - 1 - 1)) 1385 ping_payload=$((esp_payload_rfc4106 - 28)) 1386 1387 mtu "${ns_a}" veth_a ${veth_mtu} 1388 mtu "${ns_b}" veth_b ${veth_mtu} 1389 mtu "${ns_a}" vti4_a ${vti_mtu} 1390 mtu "${ns_b}" vti4_b ${vti_mtu} 1391 1392 # Send DF packet without exceeding link layer MTU, check that no 1393 # exception is created 1394 run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s ${ping_payload} ${tunnel4_b_addr} 1395 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel4_b_addr})" 1396 check_pmtu_value "" "${pmtu}" "sending packet smaller than PMTU (IP payload length ${esp_payload_rfc4106})" || return 1 1397 1398 # Now exceed link layer MTU by one byte, check that exception is created 1399 # with the right PMTU value 1400 run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s $((ping_payload + 1)) ${tunnel4_b_addr} 1401 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel4_b_addr})" 1402 check_pmtu_value "${esp_payload_rfc4106}" "${pmtu}" "exceeding PMTU (IP payload length $((esp_payload_rfc4106 + 1)))" 1403} 1404 1405test_pmtu_vti6_exception() { 1406 setup namespaces veth vti6 xfrm6 || return $ksft_skip 1407 trace "${ns_a}" veth_a "${ns_b}" veth_b \ 1408 "${ns_a}" vti6_a "${ns_b}" vti6_b 1409 fail=0 1410 1411 # Create route exception by exceeding link layer MTU 1412 mtu "${ns_a}" veth_a 4000 1413 mtu "${ns_b}" veth_b 4000 1414 mtu "${ns_a}" vti6_a 5000 1415 mtu "${ns_b}" vti6_b 5000 1416 run_cmd ${ns_a} ${ping6} -q -i 0.1 -w 1 -s 60000 ${tunnel6_b_addr} 1417 1418 # Check that exception was created 1419 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})" 1420 check_pmtu_value any "${pmtu}" "creating tunnel exceeding link layer MTU" || return 1 1421 1422 # Decrease tunnel MTU, check for PMTU decrease in route exception 1423 mtu "${ns_a}" vti6_a 3000 1424 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})" 1425 check_pmtu_value "3000" "${pmtu}" "decreasing tunnel MTU" || fail=1 1426 1427 # Increase tunnel MTU, check for PMTU increase in route exception 1428 mtu "${ns_a}" vti6_a 9000 1429 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})" 1430 check_pmtu_value "9000" "${pmtu}" "increasing tunnel MTU" || fail=1 1431 1432 return ${fail} 1433} 1434 1435test_pmtu_vti4_default_mtu() { 1436 setup namespaces veth vti4 || return $ksft_skip 1437 1438 # Check that MTU of vti device is MTU of veth minus IPv4 header length 1439 veth_mtu="$(link_get_mtu "${ns_a}" veth_a)" 1440 vti4_mtu="$(link_get_mtu "${ns_a}" vti4_a)" 1441 if [ $((veth_mtu - vti4_mtu)) -ne 20 ]; then 1442 err " vti MTU ${vti4_mtu} is not veth MTU ${veth_mtu} minus IPv4 header length" 1443 return 1 1444 fi 1445} 1446 1447test_pmtu_vti6_default_mtu() { 1448 setup namespaces veth vti6 || return $ksft_skip 1449 1450 # Check that MTU of vti device is MTU of veth minus IPv6 header length 1451 veth_mtu="$(link_get_mtu "${ns_a}" veth_a)" 1452 vti6_mtu="$(link_get_mtu "${ns_a}" vti6_a)" 1453 if [ $((veth_mtu - vti6_mtu)) -ne 40 ]; then 1454 err " vti MTU ${vti6_mtu} is not veth MTU ${veth_mtu} minus IPv6 header length" 1455 return 1 1456 fi 1457} 1458 1459test_pmtu_vti4_link_add_mtu() { 1460 setup namespaces || return $ksft_skip 1461 1462 run_cmd ${ns_a} ip link add vti4_a type vti local ${veth4_a_addr} remote ${veth4_b_addr} key 10 1463 [ $? -ne 0 ] && err " vti not supported" && return $ksft_skip 1464 run_cmd ${ns_a} ip link del vti4_a 1465 1466 fail=0 1467 1468 min=68 1469 max=$((65535 - 20)) 1470 # Check invalid values first 1471 for v in $((min - 1)) $((max + 1)); do 1472 run_cmd ${ns_a} ip link add vti4_a mtu ${v} type vti local ${veth4_a_addr} remote ${veth4_b_addr} key 10 1473 # This can fail, or MTU can be adjusted to a proper value 1474 [ $? -ne 0 ] && continue 1475 mtu="$(link_get_mtu "${ns_a}" vti4_a)" 1476 if [ ${mtu} -lt ${min} -o ${mtu} -gt ${max} ]; then 1477 err " vti tunnel created with invalid MTU ${mtu}" 1478 fail=1 1479 fi 1480 run_cmd ${ns_a} ip link del vti4_a 1481 done 1482 1483 # Now check valid values 1484 for v in ${min} 1300 ${max}; do 1485 run_cmd ${ns_a} ip link add vti4_a mtu ${v} type vti local ${veth4_a_addr} remote ${veth4_b_addr} key 10 1486 mtu="$(link_get_mtu "${ns_a}" vti4_a)" 1487 run_cmd ${ns_a} ip link del vti4_a 1488 if [ "${mtu}" != "${v}" ]; then 1489 err " vti MTU ${mtu} doesn't match configured value ${v}" 1490 fail=1 1491 fi 1492 done 1493 1494 return ${fail} 1495} 1496 1497test_pmtu_vti6_link_add_mtu() { 1498 setup namespaces || return $ksft_skip 1499 1500 run_cmd ${ns_a} ip link add vti6_a type vti6 local ${veth6_a_addr} remote ${veth6_b_addr} key 10 1501 [ $? -ne 0 ] && err " vti6 not supported" && return $ksft_skip 1502 run_cmd ${ns_a} ip link del vti6_a 1503 1504 fail=0 1505 1506 min=68 # vti6 can carry IPv4 packets too 1507 max=$((65535 - 40)) 1508 # Check invalid values first 1509 for v in $((min - 1)) $((max + 1)); do 1510 run_cmd ${ns_a} ip link add vti6_a mtu ${v} type vti6 local ${veth6_a_addr} remote ${veth6_b_addr} key 10 1511 # This can fail, or MTU can be adjusted to a proper value 1512 [ $? -ne 0 ] && continue 1513 mtu="$(link_get_mtu "${ns_a}" vti6_a)" 1514 if [ ${mtu} -lt ${min} -o ${mtu} -gt ${max} ]; then 1515 err " vti6 tunnel created with invalid MTU ${v}" 1516 fail=1 1517 fi 1518 run_cmd ${ns_a} ip link del vti6_a 1519 done 1520 1521 # Now check valid values 1522 for v in 68 1280 1300 $((65535 - 40)); do 1523 run_cmd ${ns_a} ip link add vti6_a mtu ${v} type vti6 local ${veth6_a_addr} remote ${veth6_b_addr} key 10 1524 mtu="$(link_get_mtu "${ns_a}" vti6_a)" 1525 run_cmd ${ns_a} ip link del vti6_a 1526 if [ "${mtu}" != "${v}" ]; then 1527 err " vti6 MTU ${mtu} doesn't match configured value ${v}" 1528 fail=1 1529 fi 1530 done 1531 1532 return ${fail} 1533} 1534 1535test_pmtu_vti6_link_change_mtu() { 1536 setup namespaces || return $ksft_skip 1537 1538 run_cmd ${ns_a} ip link add dummy0 mtu 1500 type dummy 1539 [ $? -ne 0 ] && err " dummy not supported" && return $ksft_skip 1540 run_cmd ${ns_a} ip link add dummy1 mtu 3000 type dummy 1541 run_cmd ${ns_a} ip link set dummy0 up 1542 run_cmd ${ns_a} ip link set dummy1 up 1543 1544 run_cmd ${ns_a} ip addr add ${dummy6_0_prefix}1/${dummy6_mask} dev dummy0 1545 run_cmd ${ns_a} ip addr add ${dummy6_1_prefix}1/${dummy6_mask} dev dummy1 1546 1547 fail=0 1548 1549 # Create vti6 interface bound to device, passing MTU, check it 1550 run_cmd ${ns_a} ip link add vti6_a mtu 1300 type vti6 remote ${dummy6_0_prefix}2 local ${dummy6_0_prefix}1 1551 mtu="$(link_get_mtu "${ns_a}" vti6_a)" 1552 if [ ${mtu} -ne 1300 ]; then 1553 err " vti6 MTU ${mtu} doesn't match configured value 1300" 1554 fail=1 1555 fi 1556 1557 # Move to another device with different MTU, without passing MTU, check 1558 # MTU is adjusted 1559 run_cmd ${ns_a} ip link set vti6_a type vti6 remote ${dummy6_1_prefix}2 local ${dummy6_1_prefix}1 1560 mtu="$(link_get_mtu "${ns_a}" vti6_a)" 1561 if [ ${mtu} -ne $((3000 - 40)) ]; then 1562 err " vti MTU ${mtu} is not dummy MTU 3000 minus IPv6 header length" 1563 fail=1 1564 fi 1565 1566 # Move it back, passing MTU, check MTU is not overridden 1567 run_cmd ${ns_a} ip link set vti6_a mtu 1280 type vti6 remote ${dummy6_0_prefix}2 local ${dummy6_0_prefix}1 1568 mtu="$(link_get_mtu "${ns_a}" vti6_a)" 1569 if [ ${mtu} -ne 1280 ]; then 1570 err " vti6 MTU ${mtu} doesn't match configured value 1280" 1571 fail=1 1572 fi 1573 1574 return ${fail} 1575} 1576 1577check_command() { 1578 cmd=${1} 1579 1580 if ! which ${cmd} > /dev/null 2>&1; then 1581 err " missing required command: '${cmd}'" 1582 return 1 1583 fi 1584 return 0 1585} 1586 1587test_cleanup_vxlanX_exception() { 1588 outer="${1}" 1589 encap="vxlan" 1590 ll_mtu=4000 1591 1592 check_command taskset || return $ksft_skip 1593 cpu_list=$(grep -m 2 processor /proc/cpuinfo | cut -d ' ' -f 2) 1594 1595 setup namespaces routing ${encap}${outer} || return $ksft_skip 1596 trace "${ns_a}" ${encap}_a "${ns_b}" ${encap}_b \ 1597 "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \ 1598 "${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B 1599 1600 # Create route exception by exceeding link layer MTU 1601 mtu "${ns_a}" veth_A-R1 $((${ll_mtu} + 1000)) 1602 mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000)) 1603 mtu "${ns_b}" veth_B-R1 ${ll_mtu} 1604 mtu "${ns_r1}" veth_R1-B ${ll_mtu} 1605 1606 mtu "${ns_a}" ${encap}_a $((${ll_mtu} + 1000)) 1607 mtu "${ns_b}" ${encap}_b $((${ll_mtu} + 1000)) 1608 1609 # Fill exception cache for multiple CPUs (2) 1610 # we can always use inner IPv4 for that 1611 for cpu in ${cpu_list}; do 1612 run_cmd taskset --cpu-list ${cpu} ${ns_a} ping -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${tunnel4_b_addr} 1613 done 1614 1615 ${ns_a} ip link del dev veth_A-R1 & 1616 iplink_pid=$! 1617 sleep 1 1618 if [ "$(cat /proc/${iplink_pid}/cmdline 2>/dev/null | tr -d '\0')" = "iplinkdeldevveth_A-R1" ]; then 1619 err " can't delete veth device in a timely manner, PMTU dst likely leaked" 1620 return 1 1621 fi 1622} 1623 1624test_cleanup_ipv6_exception() { 1625 test_cleanup_vxlanX_exception 6 1626} 1627 1628test_cleanup_ipv4_exception() { 1629 test_cleanup_vxlanX_exception 4 1630} 1631 1632run_test() { 1633 ( 1634 tname="$1" 1635 tdesc="$2" 1636 1637 unset IFS 1638 1639 if [ "$VERBOSE" = "1" ]; then 1640 printf "\n##########################################################################\n\n" 1641 fi 1642 1643 eval test_${tname} 1644 ret=$? 1645 1646 if [ $ret -eq 0 ]; then 1647 printf "TEST: %-60s [ OK ]\n" "${tdesc}" 1648 elif [ $ret -eq 1 ]; then 1649 printf "TEST: %-60s [FAIL]\n" "${tdesc}" 1650 if [ "${PAUSE_ON_FAIL}" = "yes" ]; then 1651 echo 1652 echo "Pausing. Hit enter to continue" 1653 read a 1654 fi 1655 err_flush 1656 exit 1 1657 elif [ $ret -eq $ksft_skip ]; then 1658 printf "TEST: %-60s [SKIP]\n" "${tdesc}" 1659 err_flush 1660 fi 1661 1662 return $ret 1663 ) 1664 ret=$? 1665 case $ret in 1666 0) 1667 all_skipped=false 1668 [ $exitcode=$ksft_skip ] && exitcode=0 1669 ;; 1670 $ksft_skip) 1671 [ $all_skipped = true ] && exitcode=$ksft_skip 1672 ;; 1673 *) 1674 all_skipped=false 1675 exitcode=1 1676 ;; 1677 esac 1678 1679 return $ret 1680} 1681 1682run_test_nh() { 1683 tname="$1" 1684 tdesc="$2" 1685 1686 USE_NH=yes 1687 run_test "${tname}" "${tdesc} - nexthop objects" 1688 USE_NH=no 1689} 1690 1691test_list_flush_ipv4_exception() { 1692 setup namespaces routing || return $ksft_skip 1693 trace "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \ 1694 "${ns_r1}" veth_R1-B "${ns_b}" veth_B-R1 \ 1695 "${ns_a}" veth_A-R2 "${ns_r2}" veth_R2-A \ 1696 "${ns_r2}" veth_R2-B "${ns_b}" veth_B-R2 1697 1698 dst_prefix1="${prefix4}.${b_r1}." 1699 dst2="${prefix4}.${b_r2}.1" 1700 1701 # Set up initial MTU values 1702 mtu "${ns_a}" veth_A-R1 2000 1703 mtu "${ns_r1}" veth_R1-A 2000 1704 mtu "${ns_r1}" veth_R1-B 1500 1705 mtu "${ns_b}" veth_B-R1 1500 1706 1707 mtu "${ns_a}" veth_A-R2 2000 1708 mtu "${ns_r2}" veth_R2-A 2000 1709 mtu "${ns_r2}" veth_R2-B 1500 1710 mtu "${ns_b}" veth_B-R2 1500 1711 1712 fail=0 1713 1714 # Add 100 addresses for veth endpoint on B reached by default A route 1715 for i in $(seq 100 199); do 1716 run_cmd ${ns_b} ip addr add "${dst_prefix1}${i}" dev veth_B-R1 1717 done 1718 1719 # Create 100 cached route exceptions for path via R1, one via R2. Note 1720 # that with IPv4 we need to actually cause a route lookup that matches 1721 # the exception caused by ICMP, in order to actually have a cached 1722 # route, so we need to ping each destination twice 1723 for i in $(seq 100 199); do 1724 run_cmd ${ns_a} ping -q -M want -i 0.1 -c 2 -s 1800 "${dst_prefix1}${i}" 1725 done 1726 run_cmd ${ns_a} ping -q -M want -i 0.1 -c 2 -s 1800 "${dst2}" 1727 1728 if [ "$(${ns_a} ip -oneline route list cache | wc -l)" -ne 101 ]; then 1729 err " can't list cached exceptions" 1730 fail=1 1731 fi 1732 1733 run_cmd ${ns_a} ip route flush cache 1734 pmtu1="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst_prefix}1)" 1735 pmtu2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst_prefix}2)" 1736 if [ -n "${pmtu1}" ] || [ -n "${pmtu2}" ] || \ 1737 [ -n "$(${ns_a} ip route list cache)" ]; then 1738 err " can't flush cached exceptions" 1739 fail=1 1740 fi 1741 1742 return ${fail} 1743} 1744 1745test_list_flush_ipv6_exception() { 1746 setup namespaces routing || return $ksft_skip 1747 trace "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \ 1748 "${ns_r1}" veth_R1-B "${ns_b}" veth_B-R1 \ 1749 "${ns_a}" veth_A-R2 "${ns_r2}" veth_R2-A \ 1750 "${ns_r2}" veth_R2-B "${ns_b}" veth_B-R2 1751 1752 dst_prefix1="${prefix6}:${b_r1}::" 1753 dst2="${prefix6}:${b_r2}::1" 1754 1755 # Set up initial MTU values 1756 mtu "${ns_a}" veth_A-R1 2000 1757 mtu "${ns_r1}" veth_R1-A 2000 1758 mtu "${ns_r1}" veth_R1-B 1500 1759 mtu "${ns_b}" veth_B-R1 1500 1760 1761 mtu "${ns_a}" veth_A-R2 2000 1762 mtu "${ns_r2}" veth_R2-A 2000 1763 mtu "${ns_r2}" veth_R2-B 1500 1764 mtu "${ns_b}" veth_B-R2 1500 1765 1766 fail=0 1767 1768 # Add 100 addresses for veth endpoint on B reached by default A route 1769 for i in $(seq 100 199); do 1770 run_cmd ${ns_b} ip addr add "${dst_prefix1}${i}" dev veth_B-R1 1771 done 1772 1773 # Create 100 cached route exceptions for path via R1, one via R2 1774 for i in $(seq 100 199); do 1775 run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s 1800 "${dst_prefix1}${i}" 1776 done 1777 run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s 1800 "${dst2}" 1778 if [ "$(${ns_a} ip -oneline -6 route list cache | wc -l)" -ne 101 ]; then 1779 err " can't list cached exceptions" 1780 fail=1 1781 fi 1782 1783 run_cmd ${ns_a} ip -6 route flush cache 1784 pmtu1="$(route_get_dst_pmtu_from_exception "${ns_a}" "${dst_prefix1}100")" 1785 pmtu2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})" 1786 if [ -n "${pmtu1}" ] || [ -n "${pmtu2}" ] || \ 1787 [ -n "$(${ns_a} ip -6 route list cache)" ]; then 1788 err " can't flush cached exceptions" 1789 fail=1 1790 fi 1791 1792 return ${fail} 1793} 1794 1795test_pmtu_ipvX_route_change() { 1796 family=${1} 1797 1798 setup namespaces routing || return 2 1799 trace "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \ 1800 "${ns_r1}" veth_R1-B "${ns_b}" veth_B-R1 \ 1801 "${ns_a}" veth_A-R2 "${ns_r2}" veth_R2-A \ 1802 "${ns_r2}" veth_R2-B "${ns_b}" veth_B-R2 1803 1804 if [ ${family} -eq 4 ]; then 1805 ping=ping 1806 dst1="${prefix4}.${b_r1}.1" 1807 dst2="${prefix4}.${b_r2}.1" 1808 gw="${prefix4}.${a_r1}.2" 1809 else 1810 ping=${ping6} 1811 dst1="${prefix6}:${b_r1}::1" 1812 dst2="${prefix6}:${b_r2}::1" 1813 gw="${prefix6}:${a_r1}::2" 1814 fi 1815 1816 # Set up initial MTU values 1817 mtu "${ns_a}" veth_A-R1 2000 1818 mtu "${ns_r1}" veth_R1-A 2000 1819 mtu "${ns_r1}" veth_R1-B 1400 1820 mtu "${ns_b}" veth_B-R1 1400 1821 1822 mtu "${ns_a}" veth_A-R2 2000 1823 mtu "${ns_r2}" veth_R2-A 2000 1824 mtu "${ns_r2}" veth_R2-B 1500 1825 mtu "${ns_b}" veth_B-R2 1500 1826 1827 # Create route exceptions 1828 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1800 ${dst1} 1829 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1800 ${dst2} 1830 1831 # Check that exceptions have been created with the correct PMTU 1832 pmtu_1="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst1})" 1833 check_pmtu_value "1400" "${pmtu_1}" "exceeding MTU" || return 1 1834 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})" 1835 check_pmtu_value "1500" "${pmtu_2}" "exceeding MTU" || return 1 1836 1837 # Replace the route from A to R1 1838 run_cmd ${ns_a} ip route change default via ${gw} 1839 1840 # Delete the device in A 1841 run_cmd ${ns_a} ip link del "veth_A-R1" 1842} 1843 1844test_pmtu_ipv4_route_change() { 1845 test_pmtu_ipvX_route_change 4 1846} 1847 1848test_pmtu_ipv6_route_change() { 1849 test_pmtu_ipvX_route_change 6 1850} 1851 1852usage() { 1853 echo 1854 echo "$0 [OPTIONS] [TEST]..." 1855 echo "If no TEST argument is given, all tests will be run." 1856 echo 1857 echo "Options" 1858 echo " --trace: capture traffic to TEST_INTERFACE.pcap" 1859 echo 1860 echo "Available tests${tests}" 1861 exit 1 1862} 1863 1864################################################################################ 1865# 1866exitcode=0 1867desc=0 1868all_skipped=true 1869 1870while getopts :ptv o 1871do 1872 case $o in 1873 p) PAUSE_ON_FAIL=yes;; 1874 v) VERBOSE=1;; 1875 t) if which tcpdump > /dev/null 2>&1; then 1876 TRACING=1 1877 else 1878 echo "=== tcpdump not available, tracing disabled" 1879 fi 1880 ;; 1881 *) usage;; 1882 esac 1883done 1884shift $(($OPTIND-1)) 1885 1886IFS=" 1887" 1888 1889for arg do 1890 # Check first that all requested tests are available before running any 1891 command -v > /dev/null "test_${arg}" || { echo "=== Test ${arg} not found"; usage; } 1892done 1893 1894trap cleanup EXIT 1895 1896# start clean 1897cleanup 1898 1899HAVE_NH=no 1900ip nexthop ls >/dev/null 2>&1 1901[ $? -eq 0 ] && HAVE_NH=yes 1902 1903name="" 1904desc="" 1905rerun_nh=0 1906for t in ${tests}; do 1907 [ "${name}" = "" ] && name="${t}" && continue 1908 [ "${desc}" = "" ] && desc="${t}" && continue 1909 1910 if [ "${HAVE_NH}" = "yes" ]; then 1911 rerun_nh="${t}" 1912 fi 1913 1914 run_this=1 1915 for arg do 1916 [ "${arg}" != "${arg#--*}" ] && continue 1917 [ "${arg}" = "${name}" ] && run_this=1 && break 1918 run_this=0 1919 done 1920 if [ $run_this -eq 1 ]; then 1921 run_test "${name}" "${desc}" 1922 # if test was skipped no need to retry with nexthop objects 1923 [ $? -eq $ksft_skip ] && rerun_nh=0 1924 1925 if [ "${rerun_nh}" = "1" ]; then 1926 run_test_nh "${name}" "${desc}" 1927 fi 1928 fi 1929 name="" 1930 desc="" 1931 rerun_nh=0 1932done 1933 1934exit ${exitcode} 1935