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--------------. a_r2: 1500 15# A B a_r3: 2000 16# '--------------R2--------------' a_r4: 1400 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}_fou{4,6}_exception 63# Same as pmtu_ipv4_vxlan4, but using a direct IPv4/IPv6 encapsulation 64# (FoU) over IPv4/IPv6, instead of VXLAN 65# 66# - pmtu_ipv{4,6}_fou{4,6}_exception 67# Same as pmtu_ipv4_vxlan4, but using a generic UDP IPv4/IPv6 68# encapsulation (GUE) over IPv4/IPv6, instead of VXLAN 69# 70# - pmtu_vti4_exception 71# Set up vti tunnel on top of veth, with xfrm states and policies, in two 72# namespaces with matching endpoints. Check that route exception is not 73# created if link layer MTU is not exceeded, then exceed it and check that 74# exception is created with the expected PMTU. The approach described 75# below for IPv6 doesn't apply here, because, on IPv4, administrative MTU 76# changes alone won't affect PMTU 77# 78# - pmtu_vti6_exception 79# Set up vti6 tunnel on top of veth, with xfrm states and policies, in two 80# namespaces with matching endpoints. Check that route exception is 81# created by exceeding link layer MTU with ping to other endpoint. Then 82# decrease and increase MTU of tunnel, checking that route exception PMTU 83# changes accordingly 84# 85# - pmtu_vti4_default_mtu 86# Set up vti4 tunnel on top of veth, in two namespaces with matching 87# endpoints. Check that MTU assigned to vti interface is the MTU of the 88# lower layer (veth) minus additional lower layer headers (zero, for veth) 89# minus IPv4 header length 90# 91# - pmtu_vti6_default_mtu 92# Same as above, for IPv6 93# 94# - pmtu_vti4_link_add_mtu 95# Set up vti4 interface passing MTU value at link creation, check MTU is 96# configured, and that link is not created with invalid MTU values 97# 98# - pmtu_vti6_link_add_mtu 99# Same as above, for IPv6 100# 101# - pmtu_vti6_link_change_mtu 102# Set up two dummy interfaces with different MTUs, create a vti6 tunnel 103# and check that configured MTU is used on link creation and changes, and 104# that MTU is properly calculated instead when MTU is not configured from 105# userspace 106 107# Kselftest framework requirement - SKIP code is 4. 108ksft_skip=4 109 110# Some systems don't have a ping6 binary anymore 111which ping6 > /dev/null 2>&1 && ping6=$(which ping6) || ping6=$(which ping) 112 113tests=" 114 pmtu_ipv4_exception ipv4: PMTU exceptions 115 pmtu_ipv6_exception ipv6: PMTU exceptions 116 pmtu_ipv4_vxlan4_exception IPv4 over vxlan4: PMTU exceptions 117 pmtu_ipv6_vxlan4_exception IPv6 over vxlan4: PMTU exceptions 118 pmtu_ipv4_vxlan6_exception IPv4 over vxlan6: PMTU exceptions 119 pmtu_ipv6_vxlan6_exception IPv6 over vxlan6: PMTU exceptions 120 pmtu_ipv4_geneve4_exception IPv4 over geneve4: PMTU exceptions 121 pmtu_ipv6_geneve4_exception IPv6 over geneve4: PMTU exceptions 122 pmtu_ipv4_geneve6_exception IPv4 over geneve6: PMTU exceptions 123 pmtu_ipv6_geneve6_exception IPv6 over geneve6: PMTU exceptions 124 pmtu_ipv4_fou4_exception IPv4 over fou4: PMTU exceptions 125 pmtu_ipv6_fou4_exception IPv6 over fou4: PMTU exceptions 126 pmtu_ipv4_fou6_exception IPv4 over fou6: PMTU exceptions 127 pmtu_ipv6_fou6_exception IPv6 over fou6: PMTU exceptions 128 pmtu_ipv4_gue4_exception IPv4 over gue4: PMTU exceptions 129 pmtu_ipv6_gue4_exception IPv6 over gue4: PMTU exceptions 130 pmtu_ipv4_gue6_exception IPv4 over gue6: PMTU exceptions 131 pmtu_ipv6_gue6_exception IPv6 over gue6: PMTU exceptions 132 pmtu_vti6_exception vti6: PMTU exceptions 133 pmtu_vti4_exception vti4: PMTU exceptions 134 pmtu_vti4_default_mtu vti4: default MTU assignment 135 pmtu_vti6_default_mtu vti6: default MTU assignment 136 pmtu_vti4_link_add_mtu vti4: MTU setting on link creation 137 pmtu_vti6_link_add_mtu vti6: MTU setting on link creation 138 pmtu_vti6_link_change_mtu vti6: MTU changes on link changes" 139 140NS_A="ns-$(mktemp -u XXXXXX)" 141NS_B="ns-$(mktemp -u XXXXXX)" 142NS_R1="ns-$(mktemp -u XXXXXX)" 143NS_R2="ns-$(mktemp -u XXXXXX)" 144ns_a="ip netns exec ${NS_A}" 145ns_b="ip netns exec ${NS_B}" 146ns_r1="ip netns exec ${NS_R1}" 147ns_r2="ip netns exec ${NS_R2}" 148 149# Addressing and routing for tests with routers: four network segments, with 150# index SEGMENT between 1 and 4, a common prefix (PREFIX4 or PREFIX6) and an 151# identifier ID, which is 1 for hosts (A and B), 2 for routers (R1 and R2). 152# Addresses are: 153# - IPv4: PREFIX4.SEGMENT.ID (/24) 154# - IPv6: PREFIX6:SEGMENT::ID (/64) 155prefix4="10.0" 156prefix6="fc00" 157a_r1=1 158a_r2=2 159b_r1=3 160b_r2=4 161# ns peer segment 162routing_addrs=" 163 A R1 ${a_r1} 164 A R2 ${a_r2} 165 B R1 ${b_r1} 166 B R2 ${b_r2} 167" 168# Traffic from A to B goes through R1 by default, and through R2, if destined to 169# B's address on the b_r2 segment. 170# Traffic from B to A goes through R1. 171# ns destination gateway 172routes=" 173 A default ${prefix4}.${a_r1}.2 174 A ${prefix4}.${b_r2}.1 ${prefix4}.${a_r2}.2 175 B default ${prefix4}.${b_r1}.2 176 177 A default ${prefix6}:${a_r1}::2 178 A ${prefix6}:${b_r2}::1 ${prefix6}:${a_r2}::2 179 B default ${prefix6}:${b_r1}::2 180" 181 182veth4_a_addr="192.168.1.1" 183veth4_b_addr="192.168.1.2" 184veth4_mask="24" 185veth6_a_addr="fd00:1::a" 186veth6_b_addr="fd00:1::b" 187veth6_mask="64" 188 189tunnel4_a_addr="192.168.2.1" 190tunnel4_b_addr="192.168.2.2" 191tunnel4_mask="24" 192tunnel6_a_addr="fd00:2::a" 193tunnel6_b_addr="fd00:2::b" 194tunnel6_mask="64" 195 196dummy6_0_addr="fc00:1000::0" 197dummy6_1_addr="fc00:1001::0" 198dummy6_mask="64" 199 200cleanup_done=1 201err_buf= 202tcpdump_pids= 203 204err() { 205 err_buf="${err_buf}${1} 206" 207} 208 209err_flush() { 210 echo -n "${err_buf}" 211 err_buf= 212} 213 214# Find the auto-generated name for this namespace 215nsname() { 216 eval echo \$NS_$1 217} 218 219setup_fou_or_gue() { 220 outer="${1}" 221 inner="${2}" 222 encap="${3}" 223 224 if [ "${outer}" = "4" ]; then 225 modprobe fou || return 2 226 a_addr="${prefix4}.${a_r1}.1" 227 b_addr="${prefix4}.${b_r1}.1" 228 if [ "${inner}" = "4" ]; then 229 type="ipip" 230 ipproto="4" 231 else 232 type="sit" 233 ipproto="41" 234 fi 235 else 236 modprobe fou6 || return 2 237 a_addr="${prefix6}:${a_r1}::1" 238 b_addr="${prefix6}:${b_r1}::1" 239 if [ "${inner}" = "4" ]; then 240 type="ip6tnl" 241 mode="mode ipip6" 242 ipproto="4 -6" 243 else 244 type="ip6tnl" 245 mode="mode ip6ip6" 246 ipproto="41 -6" 247 fi 248 fi 249 250 ${ns_a} ip fou add port 5555 ipproto ${ipproto} || return 2 251 ${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 2 252 253 ${ns_b} ip fou add port 5556 ipproto ${ipproto} 254 ${ns_b} ip link add ${encap}_b type ${type} ${mode} local ${b_addr} remote ${a_addr} encap ${encap} encap-sport auto encap-dport 5555 255 256 if [ "${inner}" = "4" ]; then 257 ${ns_a} ip addr add ${tunnel4_a_addr}/${tunnel4_mask} dev ${encap}_a 258 ${ns_b} ip addr add ${tunnel4_b_addr}/${tunnel4_mask} dev ${encap}_b 259 else 260 ${ns_a} ip addr add ${tunnel6_a_addr}/${tunnel6_mask} dev ${encap}_a 261 ${ns_b} ip addr add ${tunnel6_b_addr}/${tunnel6_mask} dev ${encap}_b 262 fi 263 264 ${ns_a} ip link set ${encap}_a up 265 ${ns_b} ip link set ${encap}_b up 266 267 sleep 1 268} 269 270setup_fou44() { 271 setup_fou_or_gue 4 4 fou 272} 273 274setup_fou46() { 275 setup_fou_or_gue 4 6 fou 276} 277 278setup_fou64() { 279 setup_fou_or_gue 6 4 fou 280} 281 282setup_fou66() { 283 setup_fou_or_gue 6 6 fou 284} 285 286setup_gue44() { 287 setup_fou_or_gue 4 4 gue 288} 289 290setup_gue46() { 291 setup_fou_or_gue 4 6 gue 292} 293 294setup_gue64() { 295 setup_fou_or_gue 6 4 gue 296} 297 298setup_gue66() { 299 setup_fou_or_gue 6 6 gue 300} 301 302setup_namespaces() { 303 for n in ${NS_A} ${NS_B} ${NS_R1} ${NS_R2}; do 304 ip netns add ${n} || return 1 305 done 306} 307 308setup_veth() { 309 ${ns_a} ip link add veth_a type veth peer name veth_b || return 1 310 ${ns_a} ip link set veth_b netns ${NS_B} 311 312 ${ns_a} ip addr add ${veth4_a_addr}/${veth4_mask} dev veth_a 313 ${ns_b} ip addr add ${veth4_b_addr}/${veth4_mask} dev veth_b 314 315 ${ns_a} ip addr add ${veth6_a_addr}/${veth6_mask} dev veth_a 316 ${ns_b} ip addr add ${veth6_b_addr}/${veth6_mask} dev veth_b 317 318 ${ns_a} ip link set veth_a up 319 ${ns_b} ip link set veth_b up 320} 321 322setup_vti() { 323 proto=${1} 324 veth_a_addr="${2}" 325 veth_b_addr="${3}" 326 vti_a_addr="${4}" 327 vti_b_addr="${5}" 328 vti_mask=${6} 329 330 [ ${proto} -eq 6 ] && vti_type="vti6" || vti_type="vti" 331 332 ${ns_a} ip link add vti${proto}_a type ${vti_type} local ${veth_a_addr} remote ${veth_b_addr} key 10 || return 1 333 ${ns_b} ip link add vti${proto}_b type ${vti_type} local ${veth_b_addr} remote ${veth_a_addr} key 10 334 335 ${ns_a} ip addr add ${vti_a_addr}/${vti_mask} dev vti${proto}_a 336 ${ns_b} ip addr add ${vti_b_addr}/${vti_mask} dev vti${proto}_b 337 338 ${ns_a} ip link set vti${proto}_a up 339 ${ns_b} ip link set vti${proto}_b up 340 341 sleep 1 342} 343 344setup_vti4() { 345 setup_vti 4 ${veth4_a_addr} ${veth4_b_addr} ${tunnel4_a_addr} ${tunnel4_b_addr} ${tunnel4_mask} 346} 347 348setup_vti6() { 349 setup_vti 6 ${veth6_a_addr} ${veth6_b_addr} ${tunnel6_a_addr} ${tunnel6_b_addr} ${tunnel6_mask} 350} 351 352setup_vxlan_or_geneve() { 353 type="${1}" 354 a_addr="${2}" 355 b_addr="${3}" 356 opts="${4}" 357 358 if [ "${type}" = "vxlan" ]; then 359 opts="${opts} ttl 64 dstport 4789" 360 opts_a="local ${a_addr}" 361 opts_b="local ${b_addr}" 362 else 363 opts_a="" 364 opts_b="" 365 fi 366 367 ${ns_a} ip link add ${type}_a type ${type} id 1 ${opts_a} remote ${b_addr} ${opts} || return 1 368 ${ns_b} ip link add ${type}_b type ${type} id 1 ${opts_b} remote ${a_addr} ${opts} 369 370 ${ns_a} ip addr add ${tunnel4_a_addr}/${tunnel4_mask} dev ${type}_a 371 ${ns_b} ip addr add ${tunnel4_b_addr}/${tunnel4_mask} dev ${type}_b 372 373 ${ns_a} ip addr add ${tunnel6_a_addr}/${tunnel6_mask} dev ${type}_a 374 ${ns_b} ip addr add ${tunnel6_b_addr}/${tunnel6_mask} dev ${type}_b 375 376 ${ns_a} ip link set ${type}_a up 377 ${ns_b} ip link set ${type}_b up 378 379 sleep 1 380} 381 382setup_geneve4() { 383 setup_vxlan_or_geneve geneve ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1 "df set" 384} 385 386setup_vxlan4() { 387 setup_vxlan_or_geneve vxlan ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1 "df set" 388} 389 390setup_geneve6() { 391 setup_vxlan_or_geneve geneve ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 392} 393 394setup_vxlan6() { 395 setup_vxlan_or_geneve vxlan ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 396} 397 398setup_xfrm() { 399 proto=${1} 400 veth_a_addr="${2}" 401 veth_b_addr="${3}" 402 403 ${ns_a} ip -${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 1 404 ${ns_a} ip -${proto} xfrm state add src ${veth_b_addr} dst ${veth_a_addr} spi 0x1001 proto esp aead "rfc4106(gcm(aes))" 0x0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f 128 mode tunnel 405 ${ns_a} ip -${proto} xfrm policy add dir out mark 10 tmpl src ${veth_a_addr} dst ${veth_b_addr} proto esp mode tunnel 406 ${ns_a} ip -${proto} xfrm policy add dir in mark 10 tmpl src ${veth_b_addr} dst ${veth_a_addr} proto esp mode tunnel 407 408 ${ns_b} ip -${proto} xfrm state add src ${veth_a_addr} dst ${veth_b_addr} spi 0x1000 proto esp aead "rfc4106(gcm(aes))" 0x0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f 128 mode tunnel 409 ${ns_b} ip -${proto} xfrm state add src ${veth_b_addr} dst ${veth_a_addr} spi 0x1001 proto esp aead "rfc4106(gcm(aes))" 0x0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f 128 mode tunnel 410 ${ns_b} ip -${proto} xfrm policy add dir out mark 10 tmpl src ${veth_b_addr} dst ${veth_a_addr} proto esp mode tunnel 411 ${ns_b} ip -${proto} xfrm policy add dir in mark 10 tmpl src ${veth_a_addr} dst ${veth_b_addr} proto esp mode tunnel 412} 413 414setup_xfrm4() { 415 setup_xfrm 4 ${veth4_a_addr} ${veth4_b_addr} 416} 417 418setup_xfrm6() { 419 setup_xfrm 6 ${veth6_a_addr} ${veth6_b_addr} 420} 421 422setup_routing() { 423 for i in ${NS_R1} ${NS_R2}; do 424 ip netns exec ${i} sysctl -q net/ipv4/ip_forward=1 425 ip netns exec ${i} sysctl -q net/ipv6/conf/all/forwarding=1 426 done 427 428 for i in ${routing_addrs}; do 429 [ "${ns}" = "" ] && ns="${i}" && continue 430 [ "${peer}" = "" ] && peer="${i}" && continue 431 [ "${segment}" = "" ] && segment="${i}" 432 433 ns_name="$(nsname ${ns})" 434 peer_name="$(nsname ${peer})" 435 if="veth_${ns}-${peer}" 436 ifpeer="veth_${peer}-${ns}" 437 438 # Create veth links 439 ip link add ${if} up netns ${ns_name} type veth peer name ${ifpeer} netns ${peer_name} || return 1 440 ip -n ${peer_name} link set dev ${ifpeer} up 441 442 # Add addresses 443 ip -n ${ns_name} addr add ${prefix4}.${segment}.1/24 dev ${if} 444 ip -n ${ns_name} addr add ${prefix6}:${segment}::1/64 dev ${if} 445 446 ip -n ${peer_name} addr add ${prefix4}.${segment}.2/24 dev ${ifpeer} 447 ip -n ${peer_name} addr add ${prefix6}:${segment}::2/64 dev ${ifpeer} 448 449 ns=""; peer=""; segment="" 450 done 451 452 for i in ${routes}; do 453 [ "${ns}" = "" ] && ns="${i}" && continue 454 [ "${addr}" = "" ] && addr="${i}" && continue 455 [ "${gw}" = "" ] && gw="${i}" 456 457 ns_name="$(nsname ${ns})" 458 459 ip -n ${ns_name} route add ${addr} via ${gw} 460 461 ns=""; addr=""; gw="" 462 done 463} 464 465setup() { 466 [ "$(id -u)" -ne 0 ] && echo " need to run as root" && return $ksft_skip 467 468 cleanup_done=0 469 for arg do 470 eval setup_${arg} || { echo " ${arg} not supported"; return 1; } 471 done 472} 473 474trace() { 475 [ $tracing -eq 0 ] && return 476 477 for arg do 478 [ "${ns_cmd}" = "" ] && ns_cmd="${arg}" && continue 479 ${ns_cmd} tcpdump -s 0 -i "${arg}" -w "${name}_${arg}.pcap" 2> /dev/null & 480 tcpdump_pids="${tcpdump_pids} $!" 481 ns_cmd= 482 done 483 sleep 1 484} 485 486cleanup() { 487 for pid in ${tcpdump_pids}; do 488 kill ${pid} 489 done 490 tcpdump_pids= 491 492 [ ${cleanup_done} -eq 1 ] && return 493 for n in ${NS_A} ${NS_B} ${NS_R1} ${NS_R2}; do 494 ip netns del ${n} 2> /dev/null 495 done 496 cleanup_done=1 497} 498 499mtu() { 500 ns_cmd="${1}" 501 dev="${2}" 502 mtu="${3}" 503 504 ${ns_cmd} ip link set dev ${dev} mtu ${mtu} 505} 506 507mtu_parse() { 508 input="${1}" 509 510 next=0 511 for i in ${input}; do 512 [ ${next} -eq 1 -a "${i}" = "lock" ] && next=2 && continue 513 [ ${next} -eq 1 ] && echo "${i}" && return 514 [ ${next} -eq 2 ] && echo "lock ${i}" && return 515 [ "${i}" = "mtu" ] && next=1 516 done 517} 518 519link_get() { 520 ns_cmd="${1}" 521 name="${2}" 522 523 ${ns_cmd} ip link show dev "${name}" 524} 525 526link_get_mtu() { 527 ns_cmd="${1}" 528 name="${2}" 529 530 mtu_parse "$(link_get "${ns_cmd}" ${name})" 531} 532 533route_get_dst_exception() { 534 ns_cmd="${1}" 535 dst="${2}" 536 537 ${ns_cmd} ip route get "${dst}" 538} 539 540route_get_dst_pmtu_from_exception() { 541 ns_cmd="${1}" 542 dst="${2}" 543 544 mtu_parse "$(route_get_dst_exception "${ns_cmd}" ${dst})" 545} 546 547check_pmtu_value() { 548 expected="${1}" 549 value="${2}" 550 event="${3}" 551 552 [ "${expected}" = "any" ] && [ -n "${value}" ] && return 0 553 [ "${value}" = "${expected}" ] && return 0 554 [ -z "${value}" ] && err " PMTU exception wasn't created after ${event}" && return 1 555 [ -z "${expected}" ] && err " PMTU exception shouldn't exist after ${event}" && return 1 556 err " found PMTU exception with incorrect MTU ${value}, expected ${expected}, after ${event}" 557 return 1 558} 559 560test_pmtu_ipvX() { 561 family=${1} 562 563 setup namespaces routing || return 2 564 trace "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \ 565 "${ns_r1}" veth_R1-B "${ns_b}" veth_B-R1 \ 566 "${ns_a}" veth_A-R2 "${ns_r2}" veth_R2-A \ 567 "${ns_r2}" veth_R2-B "${ns_b}" veth_B-R2 568 569 if [ ${family} -eq 4 ]; then 570 ping=ping 571 dst1="${prefix4}.${b_r1}.1" 572 dst2="${prefix4}.${b_r2}.1" 573 else 574 ping=${ping6} 575 dst1="${prefix6}:${b_r1}::1" 576 dst2="${prefix6}:${b_r2}::1" 577 fi 578 579 # Set up initial MTU values 580 mtu "${ns_a}" veth_A-R1 2000 581 mtu "${ns_r1}" veth_R1-A 2000 582 mtu "${ns_r1}" veth_R1-B 1400 583 mtu "${ns_b}" veth_B-R1 1400 584 585 mtu "${ns_a}" veth_A-R2 2000 586 mtu "${ns_r2}" veth_R2-A 2000 587 mtu "${ns_r2}" veth_R2-B 1500 588 mtu "${ns_b}" veth_B-R2 1500 589 590 # Create route exceptions 591 ${ns_a} ${ping} -q -M want -i 0.1 -w 2 -s 1800 ${dst1} > /dev/null 592 ${ns_a} ${ping} -q -M want -i 0.1 -w 2 -s 1800 ${dst2} > /dev/null 593 594 # Check that exceptions have been created with the correct PMTU 595 pmtu_1="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst1})" 596 check_pmtu_value "1400" "${pmtu_1}" "exceeding MTU" || return 1 597 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})" 598 check_pmtu_value "1500" "${pmtu_2}" "exceeding MTU" || return 1 599 600 # Decrease local MTU below PMTU, check for PMTU decrease in route exception 601 mtu "${ns_a}" veth_A-R1 1300 602 mtu "${ns_r1}" veth_R1-A 1300 603 pmtu_1="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst1})" 604 check_pmtu_value "1300" "${pmtu_1}" "decreasing local MTU" || return 1 605 # Second exception shouldn't be modified 606 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})" 607 check_pmtu_value "1500" "${pmtu_2}" "changing local MTU on a link not on this path" || return 1 608 609 # Increase MTU, check for PMTU increase in route exception 610 mtu "${ns_a}" veth_A-R1 1700 611 mtu "${ns_r1}" veth_R1-A 1700 612 pmtu_1="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst1})" 613 check_pmtu_value "1700" "${pmtu_1}" "increasing local MTU" || return 1 614 # Second exception shouldn't be modified 615 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})" 616 check_pmtu_value "1500" "${pmtu_2}" "changing local MTU on a link not on this path" || return 1 617 618 # Skip PMTU locking tests for IPv6 619 [ $family -eq 6 ] && return 0 620 621 # Decrease remote MTU on path via R2, get new exception 622 mtu "${ns_r2}" veth_R2-B 400 623 mtu "${ns_b}" veth_B-R2 400 624 ${ns_a} ${ping} -q -M want -i 0.1 -w 2 -s 1400 ${dst2} > /dev/null 625 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})" 626 check_pmtu_value "lock 552" "${pmtu_2}" "exceeding MTU, with MTU < min_pmtu" || return 1 627 628 # Decrease local MTU below PMTU 629 mtu "${ns_a}" veth_A-R2 500 630 mtu "${ns_r2}" veth_R2-A 500 631 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})" 632 check_pmtu_value "500" "${pmtu_2}" "decreasing local MTU" || return 1 633 634 # Increase local MTU 635 mtu "${ns_a}" veth_A-R2 1500 636 mtu "${ns_r2}" veth_R2-A 1500 637 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})" 638 check_pmtu_value "1500" "${pmtu_2}" "increasing local MTU" || return 1 639 640 # Get new exception 641 ${ns_a} ${ping} -q -M want -i 0.1 -w 2 -s 1400 ${dst2} > /dev/null 642 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})" 643 check_pmtu_value "lock 552" "${pmtu_2}" "exceeding MTU, with MTU < min_pmtu" || return 1 644} 645 646test_pmtu_ipv4_exception() { 647 test_pmtu_ipvX 4 648} 649 650test_pmtu_ipv6_exception() { 651 test_pmtu_ipvX 6 652} 653 654test_pmtu_ipvX_over_vxlanY_or_geneveY_exception() { 655 type=${1} 656 family=${2} 657 outer_family=${3} 658 ll_mtu=4000 659 660 if [ ${outer_family} -eq 4 ]; then 661 setup namespaces routing ${type}4 || return 2 662 # IPv4 header UDP header VXLAN/GENEVE header Ethernet header 663 exp_mtu=$((${ll_mtu} - 20 - 8 - 8 - 14)) 664 else 665 setup namespaces routing ${type}6 || return 2 666 # IPv6 header UDP header VXLAN/GENEVE header Ethernet header 667 exp_mtu=$((${ll_mtu} - 40 - 8 - 8 - 14)) 668 fi 669 670 trace "${ns_a}" ${type}_a "${ns_b}" ${type}_b \ 671 "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \ 672 "${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B 673 674 if [ ${family} -eq 4 ]; then 675 ping=ping 676 dst=${tunnel4_b_addr} 677 else 678 ping=${ping6} 679 dst=${tunnel6_b_addr} 680 fi 681 682 # Create route exception by exceeding link layer MTU 683 mtu "${ns_a}" veth_A-R1 $((${ll_mtu} + 1000)) 684 mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000)) 685 mtu "${ns_b}" veth_B-R1 ${ll_mtu} 686 mtu "${ns_r1}" veth_R1-B ${ll_mtu} 687 688 mtu "${ns_a}" ${type}_a $((${ll_mtu} + 1000)) 689 mtu "${ns_b}" ${type}_b $((${ll_mtu} + 1000)) 690 ${ns_a} ${ping} -q -M want -i 0.1 -w 2 -s $((${ll_mtu} + 500)) ${dst} > /dev/null 691 692 # Check that exception was created 693 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst})" 694 check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on ${type} interface" 695} 696 697test_pmtu_ipv4_vxlan4_exception() { 698 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception vxlan 4 4 699} 700 701test_pmtu_ipv6_vxlan4_exception() { 702 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception vxlan 6 4 703} 704 705test_pmtu_ipv4_geneve4_exception() { 706 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception geneve 4 4 707} 708 709test_pmtu_ipv6_geneve4_exception() { 710 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception geneve 6 4 711} 712 713test_pmtu_ipv4_vxlan6_exception() { 714 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception vxlan 4 6 715} 716 717test_pmtu_ipv6_vxlan6_exception() { 718 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception vxlan 6 6 719} 720 721test_pmtu_ipv4_geneve6_exception() { 722 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception geneve 4 6 723} 724 725test_pmtu_ipv6_geneve6_exception() { 726 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception geneve 6 6 727} 728 729test_pmtu_ipvX_over_fouY_or_gueY() { 730 inner_family=${1} 731 outer_family=${2} 732 encap=${3} 733 ll_mtu=4000 734 735 setup namespaces routing ${encap}${outer_family}${inner_family} || return 2 736 trace "${ns_a}" ${encap}_a "${ns_b}" ${encap}_b \ 737 "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \ 738 "${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B 739 740 if [ ${inner_family} -eq 4 ]; then 741 ping=ping 742 dst=${tunnel4_b_addr} 743 else 744 ping=${ping6} 745 dst=${tunnel6_b_addr} 746 fi 747 748 if [ "${encap}" = "gue" ]; then 749 encap_overhead=4 750 else 751 encap_overhead=0 752 fi 753 754 if [ ${outer_family} -eq 4 ]; then 755 # IPv4 header UDP header 756 exp_mtu=$((${ll_mtu} - 20 - 8 - ${encap_overhead})) 757 else 758 # IPv6 header Option 4 UDP header 759 exp_mtu=$((${ll_mtu} - 40 - 8 - 8 - ${encap_overhead})) 760 fi 761 762 # Create route exception by exceeding link layer MTU 763 mtu "${ns_a}" veth_A-R1 $((${ll_mtu} + 1000)) 764 mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000)) 765 mtu "${ns_b}" veth_B-R1 ${ll_mtu} 766 mtu "${ns_r1}" veth_R1-B ${ll_mtu} 767 768 mtu "${ns_a}" ${encap}_a $((${ll_mtu} + 1000)) 769 mtu "${ns_b}" ${encap}_b $((${ll_mtu} + 1000)) 770 ${ns_a} ${ping} -q -M want -i 0.1 -w 2 -s $((${ll_mtu} + 500)) ${dst} > /dev/null 771 772 # Check that exception was created 773 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst})" 774 check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on ${encap} interface" 775} 776 777test_pmtu_ipv4_fou4_exception() { 778 test_pmtu_ipvX_over_fouY_or_gueY 4 4 fou 779} 780 781test_pmtu_ipv6_fou4_exception() { 782 test_pmtu_ipvX_over_fouY_or_gueY 6 4 fou 783} 784 785test_pmtu_ipv4_fou6_exception() { 786 test_pmtu_ipvX_over_fouY_or_gueY 4 6 fou 787} 788 789test_pmtu_ipv6_fou6_exception() { 790 test_pmtu_ipvX_over_fouY_or_gueY 6 6 fou 791} 792 793test_pmtu_ipv4_gue4_exception() { 794 test_pmtu_ipvX_over_fouY_or_gueY 4 4 gue 795} 796 797test_pmtu_ipv6_gue4_exception() { 798 test_pmtu_ipvX_over_fouY_or_gueY 6 4 gue 799} 800 801test_pmtu_ipv4_gue6_exception() { 802 test_pmtu_ipvX_over_fouY_or_gueY 4 6 gue 803} 804 805test_pmtu_ipv6_gue6_exception() { 806 test_pmtu_ipvX_over_fouY_or_gueY 6 6 gue 807} 808 809test_pmtu_vti4_exception() { 810 setup namespaces veth vti4 xfrm4 || return 2 811 trace "${ns_a}" veth_a "${ns_b}" veth_b \ 812 "${ns_a}" vti4_a "${ns_b}" vti4_b 813 814 veth_mtu=1500 815 vti_mtu=$((veth_mtu - 20)) 816 817 # SPI SN IV ICV pad length next header 818 esp_payload_rfc4106=$((vti_mtu - 4 - 4 - 8 - 16 - 1 - 1)) 819 ping_payload=$((esp_payload_rfc4106 - 28)) 820 821 mtu "${ns_a}" veth_a ${veth_mtu} 822 mtu "${ns_b}" veth_b ${veth_mtu} 823 mtu "${ns_a}" vti4_a ${vti_mtu} 824 mtu "${ns_b}" vti4_b ${vti_mtu} 825 826 # Send DF packet without exceeding link layer MTU, check that no 827 # exception is created 828 ${ns_a} ping -q -M want -i 0.1 -w 2 -s ${ping_payload} ${tunnel4_b_addr} > /dev/null 829 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel4_b_addr})" 830 check_pmtu_value "" "${pmtu}" "sending packet smaller than PMTU (IP payload length ${esp_payload_rfc4106})" || return 1 831 832 # Now exceed link layer MTU by one byte, check that exception is created 833 # with the right PMTU value 834 ${ns_a} ping -q -M want -i 0.1 -w 2 -s $((ping_payload + 1)) ${tunnel4_b_addr} > /dev/null 835 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel4_b_addr})" 836 check_pmtu_value "${esp_payload_rfc4106}" "${pmtu}" "exceeding PMTU (IP payload length $((esp_payload_rfc4106 + 1)))" 837} 838 839test_pmtu_vti6_exception() { 840 setup namespaces veth vti6 xfrm6 || return 2 841 trace "${ns_a}" veth_a "${ns_b}" veth_b \ 842 "${ns_a}" vti6_a "${ns_b}" vti6_b 843 fail=0 844 845 # Create route exception by exceeding link layer MTU 846 mtu "${ns_a}" veth_a 4000 847 mtu "${ns_b}" veth_b 4000 848 mtu "${ns_a}" vti6_a 5000 849 mtu "${ns_b}" vti6_b 5000 850 ${ns_a} ${ping6} -q -i 0.1 -w 2 -s 60000 ${tunnel6_b_addr} > /dev/null 851 852 # Check that exception was created 853 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})" 854 check_pmtu_value any "${pmtu}" "creating tunnel exceeding link layer MTU" || return 1 855 856 # Decrease tunnel MTU, check for PMTU decrease in route exception 857 mtu "${ns_a}" vti6_a 3000 858 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})" 859 check_pmtu_value "3000" "${pmtu}" "decreasing tunnel MTU" || fail=1 860 861 # Increase tunnel MTU, check for PMTU increase in route exception 862 mtu "${ns_a}" vti6_a 9000 863 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})" 864 check_pmtu_value "9000" "${pmtu}" "increasing tunnel MTU" || fail=1 865 866 return ${fail} 867} 868 869test_pmtu_vti4_default_mtu() { 870 setup namespaces veth vti4 || return 2 871 872 # Check that MTU of vti device is MTU of veth minus IPv4 header length 873 veth_mtu="$(link_get_mtu "${ns_a}" veth_a)" 874 vti4_mtu="$(link_get_mtu "${ns_a}" vti4_a)" 875 if [ $((veth_mtu - vti4_mtu)) -ne 20 ]; then 876 err " vti MTU ${vti4_mtu} is not veth MTU ${veth_mtu} minus IPv4 header length" 877 return 1 878 fi 879} 880 881test_pmtu_vti6_default_mtu() { 882 setup namespaces veth vti6 || return 2 883 884 # Check that MTU of vti device is MTU of veth minus IPv6 header length 885 veth_mtu="$(link_get_mtu "${ns_a}" veth_a)" 886 vti6_mtu="$(link_get_mtu "${ns_a}" vti6_a)" 887 if [ $((veth_mtu - vti6_mtu)) -ne 40 ]; then 888 err " vti MTU ${vti6_mtu} is not veth MTU ${veth_mtu} minus IPv6 header length" 889 return 1 890 fi 891} 892 893test_pmtu_vti4_link_add_mtu() { 894 setup namespaces || return 2 895 896 ${ns_a} ip link add vti4_a type vti local ${veth4_a_addr} remote ${veth4_b_addr} key 10 897 [ $? -ne 0 ] && err " vti not supported" && return 2 898 ${ns_a} ip link del vti4_a 899 900 fail=0 901 902 min=68 903 max=$((65535 - 20)) 904 # Check invalid values first 905 for v in $((min - 1)) $((max + 1)); do 906 ${ns_a} ip link add vti4_a mtu ${v} type vti local ${veth4_a_addr} remote ${veth4_b_addr} key 10 2>/dev/null 907 # This can fail, or MTU can be adjusted to a proper value 908 [ $? -ne 0 ] && continue 909 mtu="$(link_get_mtu "${ns_a}" vti4_a)" 910 if [ ${mtu} -lt ${min} -o ${mtu} -gt ${max} ]; then 911 err " vti tunnel created with invalid MTU ${mtu}" 912 fail=1 913 fi 914 ${ns_a} ip link del vti4_a 915 done 916 917 # Now check valid values 918 for v in ${min} 1300 ${max}; do 919 ${ns_a} ip link add vti4_a mtu ${v} type vti local ${veth4_a_addr} remote ${veth4_b_addr} key 10 920 mtu="$(link_get_mtu "${ns_a}" vti4_a)" 921 ${ns_a} ip link del vti4_a 922 if [ "${mtu}" != "${v}" ]; then 923 err " vti MTU ${mtu} doesn't match configured value ${v}" 924 fail=1 925 fi 926 done 927 928 return ${fail} 929} 930 931test_pmtu_vti6_link_add_mtu() { 932 setup namespaces || return 2 933 934 ${ns_a} ip link add vti6_a type vti6 local ${veth6_a_addr} remote ${veth6_b_addr} key 10 935 [ $? -ne 0 ] && err " vti6 not supported" && return 2 936 ${ns_a} ip link del vti6_a 937 938 fail=0 939 940 min=68 # vti6 can carry IPv4 packets too 941 max=$((65535 - 40)) 942 # Check invalid values first 943 for v in $((min - 1)) $((max + 1)); do 944 ${ns_a} ip link add vti6_a mtu ${v} type vti6 local ${veth6_a_addr} remote ${veth6_b_addr} key 10 2>/dev/null 945 # This can fail, or MTU can be adjusted to a proper value 946 [ $? -ne 0 ] && continue 947 mtu="$(link_get_mtu "${ns_a}" vti6_a)" 948 if [ ${mtu} -lt ${min} -o ${mtu} -gt ${max} ]; then 949 err " vti6 tunnel created with invalid MTU ${v}" 950 fail=1 951 fi 952 ${ns_a} ip link del vti6_a 953 done 954 955 # Now check valid values 956 for v in 68 1280 1300 $((65535 - 40)); do 957 ${ns_a} ip link add vti6_a mtu ${v} type vti6 local ${veth6_a_addr} remote ${veth6_b_addr} key 10 958 mtu="$(link_get_mtu "${ns_a}" vti6_a)" 959 ${ns_a} ip link del vti6_a 960 if [ "${mtu}" != "${v}" ]; then 961 err " vti6 MTU ${mtu} doesn't match configured value ${v}" 962 fail=1 963 fi 964 done 965 966 return ${fail} 967} 968 969test_pmtu_vti6_link_change_mtu() { 970 setup namespaces || return 2 971 972 ${ns_a} ip link add dummy0 mtu 1500 type dummy 973 [ $? -ne 0 ] && err " dummy not supported" && return 2 974 ${ns_a} ip link add dummy1 mtu 3000 type dummy 975 ${ns_a} ip link set dummy0 up 976 ${ns_a} ip link set dummy1 up 977 978 ${ns_a} ip addr add ${dummy6_0_addr}/${dummy6_mask} dev dummy0 979 ${ns_a} ip addr add ${dummy6_1_addr}/${dummy6_mask} dev dummy1 980 981 fail=0 982 983 # Create vti6 interface bound to device, passing MTU, check it 984 ${ns_a} ip link add vti6_a mtu 1300 type vti6 remote ${dummy6_0_addr} local ${dummy6_0_addr} 985 mtu="$(link_get_mtu "${ns_a}" vti6_a)" 986 if [ ${mtu} -ne 1300 ]; then 987 err " vti6 MTU ${mtu} doesn't match configured value 1300" 988 fail=1 989 fi 990 991 # Move to another device with different MTU, without passing MTU, check 992 # MTU is adjusted 993 ${ns_a} ip link set vti6_a type vti6 remote ${dummy6_1_addr} local ${dummy6_1_addr} 994 mtu="$(link_get_mtu "${ns_a}" vti6_a)" 995 if [ ${mtu} -ne $((3000 - 40)) ]; then 996 err " vti MTU ${mtu} is not dummy MTU 3000 minus IPv6 header length" 997 fail=1 998 fi 999 1000 # Move it back, passing MTU, check MTU is not overridden 1001 ${ns_a} ip link set vti6_a mtu 1280 type vti6 remote ${dummy6_0_addr} local ${dummy6_0_addr} 1002 mtu="$(link_get_mtu "${ns_a}" vti6_a)" 1003 if [ ${mtu} -ne 1280 ]; then 1004 err " vti6 MTU ${mtu} doesn't match configured value 1280" 1005 fail=1 1006 fi 1007 1008 return ${fail} 1009} 1010 1011usage() { 1012 echo 1013 echo "$0 [OPTIONS] [TEST]..." 1014 echo "If no TEST argument is given, all tests will be run." 1015 echo 1016 echo "Options" 1017 echo " --trace: capture traffic to TEST_INTERFACE.pcap" 1018 echo 1019 echo "Available tests${tests}" 1020 exit 1 1021} 1022 1023exitcode=0 1024desc=0 1025IFS=" 1026" 1027 1028tracing=0 1029for arg do 1030 if [ "${arg}" != "${arg#--*}" ]; then 1031 opt="${arg#--}" 1032 if [ "${opt}" = "trace" ]; then 1033 if which tcpdump > /dev/null 2>&1; then 1034 tracing=1 1035 else 1036 echo "=== tcpdump not available, tracing disabled" 1037 fi 1038 else 1039 usage 1040 fi 1041 else 1042 # Check first that all requested tests are available before 1043 # running any 1044 command -v > /dev/null "test_${arg}" || { echo "=== Test ${arg} not found"; usage; } 1045 fi 1046done 1047 1048trap cleanup EXIT 1049 1050for t in ${tests}; do 1051 [ $desc -eq 0 ] && name="${t}" && desc=1 && continue || desc=0 1052 1053 run_this=1 1054 for arg do 1055 [ "${arg}" != "${arg#--*}" ] && continue 1056 [ "${arg}" = "${name}" ] && run_this=1 && break 1057 run_this=0 1058 done 1059 [ $run_this -eq 0 ] && continue 1060 1061 ( 1062 unset IFS 1063 eval test_${name} 1064 ret=$? 1065 cleanup 1066 1067 if [ $ret -eq 0 ]; then 1068 printf "TEST: %-60s [ OK ]\n" "${t}" 1069 elif [ $ret -eq 1 ]; then 1070 printf "TEST: %-60s [FAIL]\n" "${t}" 1071 err_flush 1072 exit 1 1073 elif [ $ret -eq 2 ]; then 1074 printf "TEST: %-60s [SKIP]\n" "${t}" 1075 err_flush 1076 fi 1077 ) 1078 [ $? -ne 0 ] && exitcode=1 1079done 1080 1081exit ${exitcode} 1082