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_dscp_icmp_exception 30# Set up the same network topology as pmtu_ipv4, but use non-default 31# routing table in A. A fib-rule is used to jump to this routing table 32# based on DSCP. Send ICMPv4 packets with the expected DSCP value and 33# verify that ECN doesn't interfere with the creation of PMTU exceptions. 34# 35# - pmtu_ipv4_dscp_udp_exception 36# Same as pmtu_ipv4_dscp_icmp_exception, but use UDP instead of ICMP. 37# 38# - pmtu_ipv4_vxlan4_exception 39# Set up the same network topology as pmtu_ipv4, create a VXLAN tunnel 40# over IPv4 between A and B, routed via R1. On the link between R1 and B, 41# set a MTU lower than the VXLAN MTU and the MTU on the link between A and 42# R1. Send IPv4 packets, exceeding the MTU between R1 and B, over VXLAN 43# from A to B and check that the PMTU exception is created with the right 44# value on A 45# 46# - pmtu_ipv6_vxlan4_exception 47# Same as pmtu_ipv4_vxlan4_exception, but send IPv6 packets from A to B 48# 49# - pmtu_ipv4_vxlan6_exception 50# Same as pmtu_ipv4_vxlan4_exception, but use IPv6 transport from A to B 51# 52# - pmtu_ipv6_vxlan6_exception 53# Same as pmtu_ipv4_vxlan6_exception, but send IPv6 packets from A to B 54# 55# - pmtu_ipv4_geneve4_exception 56# Same as pmtu_ipv4_vxlan4_exception, but using a GENEVE tunnel instead of 57# VXLAN 58# 59# - pmtu_ipv6_geneve4_exception 60# Same as pmtu_ipv6_vxlan4_exception, but using a GENEVE tunnel instead of 61# VXLAN 62# 63# - pmtu_ipv4_geneve6_exception 64# Same as pmtu_ipv4_vxlan6_exception, but using a GENEVE tunnel instead of 65# VXLAN 66# 67# - pmtu_ipv6_geneve6_exception 68# Same as pmtu_ipv6_vxlan6_exception, but using a GENEVE tunnel instead of 69# VXLAN 70# 71# - pmtu_ipv{4,6}_br_vxlan{4,6}_exception 72# Set up three namespaces, A, B, and C, with routing between A and B over 73# R1. R2 is unused in these tests. A has a veth connection to C, and is 74# connected to B via a VXLAN endpoint, which is directly bridged to C. 75# MTU on the B-R1 link is lower than other MTUs. 76# 77# Check that both C and A are able to communicate with B over the VXLAN 78# tunnel, and that PMTU exceptions with the correct values are created. 79# 80# segment a_r1 segment b_r1 b_r1: 4000 81# .--------------R1--------------. everything 82# C---veth A B else: 5000 83# ' bridge | 84# '---- - - - - - VXLAN - - - - - - - ' 85# 86# - pmtu_ipv{4,6}_br_geneve{4,6}_exception 87# Same as pmtu_ipv{4,6}_br_vxlan{4,6}_exception, with a GENEVE tunnel 88# instead. 89# 90# - pmtu_ipv{4,6}_ovs_vxlan{4,6}_exception 91# Set up two namespaces, B, and C, with routing between the init namespace 92# and B over R1. A and R2 are unused in these tests. The init namespace 93# has a veth connection to C, and is connected to B via a VXLAN endpoint, 94# which is handled by Open vSwitch and bridged to C. MTU on the B-R1 link 95# is lower than other MTUs. 96# 97# Check that C is able to communicate with B over the VXLAN tunnel, and 98# that PMTU exceptions with the correct values are created. 99# 100# segment a_r1 segment b_r1 b_r1: 4000 101# .--------------R1--------------. everything 102# C---veth init B else: 5000 103# '- ovs | 104# '---- - - - - - VXLAN - - - - - - - ' 105# 106# - pmtu_ipv{4,6}_ovs_geneve{4,6}_exception 107# Same as pmtu_ipv{4,6}_ovs_vxlan{4,6}_exception, with a GENEVE tunnel 108# instead. 109# 110# - pmtu_ipv{4,6}_fou{4,6}_exception 111# Same as pmtu_ipv4_vxlan4, but using a direct IPv4/IPv6 encapsulation 112# (FoU) over IPv4/IPv6, instead of VXLAN 113# 114# - pmtu_ipv{4,6}_fou{4,6}_exception 115# Same as pmtu_ipv4_vxlan4, but using a generic UDP IPv4/IPv6 116# encapsulation (GUE) over IPv4/IPv6, instead of VXLAN 117# 118# - pmtu_ipv{4,6}_ipv{4,6}_exception 119# Same as pmtu_ipv4_vxlan4, but using a IPv4/IPv6 tunnel over IPv4/IPv6, 120# instead of VXLAN 121# 122# - pmtu_vti4_exception 123# Set up vti tunnel on top of veth, with xfrm states and policies, in two 124# namespaces with matching endpoints. Check that route exception is not 125# created if link layer MTU is not exceeded, then exceed it and check that 126# exception is created with the expected PMTU. The approach described 127# below for IPv6 doesn't apply here, because, on IPv4, administrative MTU 128# changes alone won't affect PMTU 129# 130# - pmtu_vti4_udp_exception 131# Same as pmtu_vti4_exception, but using ESP-in-UDP 132# 133# - pmtu_vti4_udp_routed_exception 134# Set up vti tunnel on top of veth connected through routing namespace and 135# add xfrm states and policies with ESP-in-UDP encapsulation. Check that 136# route exception is not created if link layer MTU is not exceeded, then 137# lower MTU on second part of routed environment and check that exception 138# is created with the expected PMTU. 139# 140# - pmtu_vti6_exception 141# Set up vti6 tunnel on top of veth, with xfrm states and policies, in two 142# namespaces with matching endpoints. Check that route exception is 143# created by exceeding link layer MTU with ping to other endpoint. Then 144# decrease and increase MTU of tunnel, checking that route exception PMTU 145# changes accordingly 146# 147# - pmtu_vti6_udp_exception 148# Same as pmtu_vti6_exception, but using ESP-in-UDP 149# 150# - pmtu_vti6_udp_routed_exception 151# Same as pmtu_vti6_udp_routed_exception but with routing between vti 152# endpoints 153# 154# - pmtu_vti4_default_mtu 155# Set up vti4 tunnel on top of veth, in two namespaces with matching 156# endpoints. Check that MTU assigned to vti interface is the MTU of the 157# lower layer (veth) minus additional lower layer headers (zero, for veth) 158# minus IPv4 header length 159# 160# - pmtu_vti6_default_mtu 161# Same as above, for IPv6 162# 163# - pmtu_vti4_link_add_mtu 164# Set up vti4 interface passing MTU value at link creation, check MTU is 165# configured, and that link is not created with invalid MTU values 166# 167# - pmtu_vti6_link_add_mtu 168# Same as above, for IPv6 169# 170# - pmtu_vti6_link_change_mtu 171# Set up two dummy interfaces with different MTUs, create a vti6 tunnel 172# and check that configured MTU is used on link creation and changes, and 173# that MTU is properly calculated instead when MTU is not configured from 174# userspace 175# 176# - cleanup_ipv4_exception 177# Similar to pmtu_ipv4_vxlan4_exception, but explicitly generate PMTU 178# exceptions on multiple CPUs and check that the veth device tear-down 179# happens in a timely manner 180# 181# - cleanup_ipv6_exception 182# Same as above, but use IPv6 transport from A to B 183# 184# - list_flush_ipv4_exception 185# Using the same topology as in pmtu_ipv4, create exceptions, and check 186# they are shown when listing exception caches, gone after flushing them 187# 188# - list_flush_ipv6_exception 189# Using the same topology as in pmtu_ipv6, create exceptions, and check 190# they are shown when listing exception caches, gone after flushing them 191# 192# - pmtu_ipv4_route_change 193# Use the same topology as in pmtu_ipv4, but issue a route replacement 194# command and delete the corresponding device afterward. This tests for 195# proper cleanup of the PMTU exceptions by the route replacement path. 196# Device unregistration should complete successfully 197# 198# - pmtu_ipv6_route_change 199# Same as above but with IPv6 200 201# Kselftest framework requirement - SKIP code is 4. 202ksft_skip=4 203 204PAUSE_ON_FAIL=no 205VERBOSE=0 206TRACING=0 207 208# Some systems don't have a ping6 binary anymore 209which ping6 > /dev/null 2>&1 && ping6=$(which ping6) || ping6=$(which ping) 210 211# Name Description re-run with nh 212tests=" 213 pmtu_ipv4_exception ipv4: PMTU exceptions 1 214 pmtu_ipv6_exception ipv6: PMTU exceptions 1 215 pmtu_ipv4_dscp_icmp_exception ICMPv4 with DSCP and ECN: PMTU exceptions 1 216 pmtu_ipv4_dscp_udp_exception UDPv4 with DSCP and ECN: PMTU exceptions 1 217 pmtu_ipv4_vxlan4_exception IPv4 over vxlan4: PMTU exceptions 1 218 pmtu_ipv6_vxlan4_exception IPv6 over vxlan4: PMTU exceptions 1 219 pmtu_ipv4_vxlan6_exception IPv4 over vxlan6: PMTU exceptions 1 220 pmtu_ipv6_vxlan6_exception IPv6 over vxlan6: PMTU exceptions 1 221 pmtu_ipv4_geneve4_exception IPv4 over geneve4: PMTU exceptions 1 222 pmtu_ipv6_geneve4_exception IPv6 over geneve4: PMTU exceptions 1 223 pmtu_ipv4_geneve6_exception IPv4 over geneve6: PMTU exceptions 1 224 pmtu_ipv6_geneve6_exception IPv6 over geneve6: PMTU exceptions 1 225 pmtu_ipv4_br_vxlan4_exception IPv4, bridged vxlan4: PMTU exceptions 1 226 pmtu_ipv6_br_vxlan4_exception IPv6, bridged vxlan4: PMTU exceptions 1 227 pmtu_ipv4_br_vxlan6_exception IPv4, bridged vxlan6: PMTU exceptions 1 228 pmtu_ipv6_br_vxlan6_exception IPv6, bridged vxlan6: PMTU exceptions 1 229 pmtu_ipv4_br_geneve4_exception IPv4, bridged geneve4: PMTU exceptions 1 230 pmtu_ipv6_br_geneve4_exception IPv6, bridged geneve4: PMTU exceptions 1 231 pmtu_ipv4_br_geneve6_exception IPv4, bridged geneve6: PMTU exceptions 1 232 pmtu_ipv6_br_geneve6_exception IPv6, bridged geneve6: PMTU exceptions 1 233 pmtu_ipv4_ovs_vxlan4_exception IPv4, OVS vxlan4: PMTU exceptions 1 234 pmtu_ipv6_ovs_vxlan4_exception IPv6, OVS vxlan4: PMTU exceptions 1 235 pmtu_ipv4_ovs_vxlan6_exception IPv4, OVS vxlan6: PMTU exceptions 1 236 pmtu_ipv6_ovs_vxlan6_exception IPv6, OVS vxlan6: PMTU exceptions 1 237 pmtu_ipv4_ovs_geneve4_exception IPv4, OVS geneve4: PMTU exceptions 1 238 pmtu_ipv6_ovs_geneve4_exception IPv6, OVS geneve4: PMTU exceptions 1 239 pmtu_ipv4_ovs_geneve6_exception IPv4, OVS geneve6: PMTU exceptions 1 240 pmtu_ipv6_ovs_geneve6_exception IPv6, OVS geneve6: PMTU exceptions 1 241 pmtu_ipv4_fou4_exception IPv4 over fou4: PMTU exceptions 1 242 pmtu_ipv6_fou4_exception IPv6 over fou4: PMTU exceptions 1 243 pmtu_ipv4_fou6_exception IPv4 over fou6: PMTU exceptions 1 244 pmtu_ipv6_fou6_exception IPv6 over fou6: PMTU exceptions 1 245 pmtu_ipv4_gue4_exception IPv4 over gue4: PMTU exceptions 1 246 pmtu_ipv6_gue4_exception IPv6 over gue4: PMTU exceptions 1 247 pmtu_ipv4_gue6_exception IPv4 over gue6: PMTU exceptions 1 248 pmtu_ipv6_gue6_exception IPv6 over gue6: PMTU exceptions 1 249 pmtu_ipv4_ipv4_exception IPv4 over IPv4: PMTU exceptions 1 250 pmtu_ipv6_ipv4_exception IPv6 over IPv4: PMTU exceptions 1 251 pmtu_ipv4_ipv6_exception IPv4 over IPv6: PMTU exceptions 1 252 pmtu_ipv6_ipv6_exception IPv6 over IPv6: PMTU exceptions 1 253 pmtu_vti6_exception vti6: PMTU exceptions 0 254 pmtu_vti4_exception vti4: PMTU exceptions 0 255 pmtu_vti6_udp_exception vti6: PMTU exceptions (ESP-in-UDP) 0 256 pmtu_vti4_udp_exception vti4: PMTU exceptions (ESP-in-UDP) 0 257 pmtu_vti6_udp_routed_exception vti6: PMTU exceptions, routed (ESP-in-UDP) 0 258 pmtu_vti4_udp_routed_exception vti4: PMTU exceptions, routed (ESP-in-UDP) 0 259 pmtu_vti4_default_mtu vti4: default MTU assignment 0 260 pmtu_vti6_default_mtu vti6: default MTU assignment 0 261 pmtu_vti4_link_add_mtu vti4: MTU setting on link creation 0 262 pmtu_vti6_link_add_mtu vti6: MTU setting on link creation 0 263 pmtu_vti6_link_change_mtu vti6: MTU changes on link changes 0 264 cleanup_ipv4_exception ipv4: cleanup of cached exceptions 1 265 cleanup_ipv6_exception ipv6: cleanup of cached exceptions 1 266 list_flush_ipv4_exception ipv4: list and flush cached exceptions 1 267 list_flush_ipv6_exception ipv6: list and flush cached exceptions 1 268 pmtu_ipv4_route_change ipv4: PMTU exception w/route replace 1 269 pmtu_ipv6_route_change ipv6: PMTU exception w/route replace 1" 270 271NS_A="ns-A" 272NS_B="ns-B" 273NS_C="ns-C" 274NS_R1="ns-R1" 275NS_R2="ns-R2" 276ns_a="ip netns exec ${NS_A}" 277ns_b="ip netns exec ${NS_B}" 278ns_c="ip netns exec ${NS_C}" 279ns_r1="ip netns exec ${NS_R1}" 280ns_r2="ip netns exec ${NS_R2}" 281# Addressing and routing for tests with routers: four network segments, with 282# index SEGMENT between 1 and 4, a common prefix (PREFIX4 or PREFIX6) and an 283# identifier ID, which is 1 for hosts (A and B), 2 for routers (R1 and R2). 284# Addresses are: 285# - IPv4: PREFIX4.SEGMENT.ID (/24) 286# - IPv6: PREFIX6:SEGMENT::ID (/64) 287prefix4="10.0" 288prefix6="fc00" 289a_r1=1 290a_r2=2 291b_r1=3 292b_r2=4 293# ns peer segment 294routing_addrs=" 295 A R1 ${a_r1} 296 A R2 ${a_r2} 297 B R1 ${b_r1} 298 B R2 ${b_r2} 299" 300# Traffic from A to B goes through R1 by default, and through R2, if destined to 301# B's address on the b_r2 segment. 302# Traffic from B to A goes through R1. 303# ns destination gateway 304routes=" 305 A default ${prefix4}.${a_r1}.2 306 A ${prefix4}.${b_r2}.1 ${prefix4}.${a_r2}.2 307 B default ${prefix4}.${b_r1}.2 308 309 A default ${prefix6}:${a_r1}::2 310 A ${prefix6}:${b_r2}::1 ${prefix6}:${a_r2}::2 311 B default ${prefix6}:${b_r1}::2 312" 313USE_NH="no" 314# ns family nh id destination gateway 315nexthops=" 316 A 4 41 ${prefix4}.${a_r1}.2 veth_A-R1 317 A 4 42 ${prefix4}.${a_r2}.2 veth_A-R2 318 B 4 41 ${prefix4}.${b_r1}.2 veth_B-R1 319 320 A 6 61 ${prefix6}:${a_r1}::2 veth_A-R1 321 A 6 62 ${prefix6}:${a_r2}::2 veth_A-R2 322 B 6 61 ${prefix6}:${b_r1}::2 veth_B-R1 323" 324 325# nexthop id correlates to id in nexthops config above 326# ns family prefix nh id 327routes_nh=" 328 A 4 default 41 329 A 4 ${prefix4}.${b_r2}.1 42 330 B 4 default 41 331 332 A 6 default 61 333 A 6 ${prefix6}:${b_r2}::1 62 334 B 6 default 61 335" 336 337policy_mark=0x04 338rt_table=main 339 340veth4_a_addr="192.168.1.1" 341veth4_b_addr="192.168.1.2" 342veth4_c_addr="192.168.2.10" 343veth4_mask="24" 344veth6_a_addr="fd00:1::a" 345veth6_b_addr="fd00:1::b" 346veth6_c_addr="fd00:2::c" 347veth6_mask="64" 348 349tunnel4_a_addr="192.168.2.1" 350tunnel4_b_addr="192.168.2.2" 351tunnel4_mask="24" 352tunnel6_a_addr="fd00:2::a" 353tunnel6_b_addr="fd00:2::b" 354tunnel6_mask="64" 355 356dummy6_0_prefix="fc00:1000::" 357dummy6_1_prefix="fc00:1001::" 358dummy6_mask="64" 359 360err_buf= 361tcpdump_pids= 362nettest_pids= 363socat_pids= 364 365err() { 366 err_buf="${err_buf}${1} 367" 368} 369 370err_flush() { 371 echo -n "${err_buf}" 372 err_buf= 373} 374 375run_cmd() { 376 cmd="$*" 377 378 if [ "$VERBOSE" = "1" ]; then 379 printf " COMMAND: $cmd\n" 380 fi 381 382 out="$($cmd 2>&1)" 383 rc=$? 384 if [ "$VERBOSE" = "1" -a -n "$out" ]; then 385 echo " $out" 386 echo 387 fi 388 389 return $rc 390} 391 392run_cmd_bg() { 393 cmd="$*" 394 395 if [ "$VERBOSE" = "1" ]; then 396 printf " COMMAND: %s &\n" "${cmd}" 397 fi 398 399 $cmd 2>&1 & 400} 401 402# Find the auto-generated name for this namespace 403nsname() { 404 eval echo \$NS_$1 405} 406 407setup_fou_or_gue() { 408 outer="${1}" 409 inner="${2}" 410 encap="${3}" 411 412 if [ "${outer}" = "4" ]; then 413 modprobe fou || return $ksft_skip 414 a_addr="${prefix4}.${a_r1}.1" 415 b_addr="${prefix4}.${b_r1}.1" 416 if [ "${inner}" = "4" ]; then 417 type="ipip" 418 ipproto="4" 419 else 420 type="sit" 421 ipproto="41" 422 fi 423 else 424 modprobe fou6 || return $ksft_skip 425 a_addr="${prefix6}:${a_r1}::1" 426 b_addr="${prefix6}:${b_r1}::1" 427 if [ "${inner}" = "4" ]; then 428 type="ip6tnl" 429 mode="mode ipip6" 430 ipproto="4 -6" 431 else 432 type="ip6tnl" 433 mode="mode ip6ip6" 434 ipproto="41 -6" 435 fi 436 fi 437 438 run_cmd ${ns_a} ip fou add port 5555 ipproto ${ipproto} || return $ksft_skip 439 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 440 441 run_cmd ${ns_b} ip fou add port 5556 ipproto ${ipproto} 442 run_cmd ${ns_b} ip link add ${encap}_b type ${type} ${mode} local ${b_addr} remote ${a_addr} encap ${encap} encap-sport auto encap-dport 5555 443 444 if [ "${inner}" = "4" ]; then 445 run_cmd ${ns_a} ip addr add ${tunnel4_a_addr}/${tunnel4_mask} dev ${encap}_a 446 run_cmd ${ns_b} ip addr add ${tunnel4_b_addr}/${tunnel4_mask} dev ${encap}_b 447 else 448 run_cmd ${ns_a} ip addr add ${tunnel6_a_addr}/${tunnel6_mask} dev ${encap}_a 449 run_cmd ${ns_b} ip addr add ${tunnel6_b_addr}/${tunnel6_mask} dev ${encap}_b 450 fi 451 452 run_cmd ${ns_a} ip link set ${encap}_a up 453 run_cmd ${ns_b} ip link set ${encap}_b up 454} 455 456setup_fou44() { 457 setup_fou_or_gue 4 4 fou 458} 459 460setup_fou46() { 461 setup_fou_or_gue 4 6 fou 462} 463 464setup_fou64() { 465 setup_fou_or_gue 6 4 fou 466} 467 468setup_fou66() { 469 setup_fou_or_gue 6 6 fou 470} 471 472setup_gue44() { 473 setup_fou_or_gue 4 4 gue 474} 475 476setup_gue46() { 477 setup_fou_or_gue 4 6 gue 478} 479 480setup_gue64() { 481 setup_fou_or_gue 6 4 gue 482} 483 484setup_gue66() { 485 setup_fou_or_gue 6 6 gue 486} 487 488setup_ipvX_over_ipvY() { 489 inner=${1} 490 outer=${2} 491 492 if [ "${outer}" -eq 4 ]; then 493 a_addr="${prefix4}.${a_r1}.1" 494 b_addr="${prefix4}.${b_r1}.1" 495 if [ "${inner}" -eq 4 ]; then 496 type="ipip" 497 mode="ipip" 498 else 499 type="sit" 500 mode="ip6ip" 501 fi 502 else 503 a_addr="${prefix6}:${a_r1}::1" 504 b_addr="${prefix6}:${b_r1}::1" 505 type="ip6tnl" 506 if [ "${inner}" -eq 4 ]; then 507 mode="ipip6" 508 else 509 mode="ip6ip6" 510 fi 511 fi 512 513 run_cmd ${ns_a} ip link add ip_a type ${type} local ${a_addr} remote ${b_addr} mode ${mode} || return $ksft_skip 514 run_cmd ${ns_b} ip link add ip_b type ${type} local ${b_addr} remote ${a_addr} mode ${mode} 515 516 run_cmd ${ns_a} ip link set ip_a up 517 run_cmd ${ns_b} ip link set ip_b up 518 519 if [ "${inner}" = "4" ]; then 520 run_cmd ${ns_a} ip addr add ${tunnel4_a_addr}/${tunnel4_mask} dev ip_a 521 run_cmd ${ns_b} ip addr add ${tunnel4_b_addr}/${tunnel4_mask} dev ip_b 522 else 523 run_cmd ${ns_a} ip addr add ${tunnel6_a_addr}/${tunnel6_mask} dev ip_a 524 run_cmd ${ns_b} ip addr add ${tunnel6_b_addr}/${tunnel6_mask} dev ip_b 525 fi 526} 527 528setup_ip4ip4() { 529 setup_ipvX_over_ipvY 4 4 530} 531 532setup_ip6ip4() { 533 setup_ipvX_over_ipvY 6 4 534} 535 536setup_ip4ip6() { 537 setup_ipvX_over_ipvY 4 6 538} 539 540setup_ip6ip6() { 541 setup_ipvX_over_ipvY 6 6 542} 543 544setup_namespaces() { 545 for n in ${NS_A} ${NS_B} ${NS_C} ${NS_R1} ${NS_R2}; do 546 ip netns add ${n} || return 1 547 548 # Disable DAD, so that we don't have to wait to use the 549 # configured IPv6 addresses 550 ip netns exec ${n} sysctl -q net/ipv6/conf/default/accept_dad=0 551 done 552} 553 554setup_veth() { 555 run_cmd ${ns_a} ip link add veth_a type veth peer name veth_b || return 1 556 run_cmd ${ns_a} ip link set veth_b netns ${NS_B} 557 558 run_cmd ${ns_a} ip addr add ${veth4_a_addr}/${veth4_mask} dev veth_a 559 run_cmd ${ns_b} ip addr add ${veth4_b_addr}/${veth4_mask} dev veth_b 560 561 run_cmd ${ns_a} ip addr add ${veth6_a_addr}/${veth6_mask} dev veth_a 562 run_cmd ${ns_b} ip addr add ${veth6_b_addr}/${veth6_mask} dev veth_b 563 564 run_cmd ${ns_a} ip link set veth_a up 565 run_cmd ${ns_b} ip link set veth_b up 566} 567 568setup_vti() { 569 proto=${1} 570 veth_a_addr="${2}" 571 veth_b_addr="${3}" 572 vti_a_addr="${4}" 573 vti_b_addr="${5}" 574 vti_mask=${6} 575 576 [ ${proto} -eq 6 ] && vti_type="vti6" || vti_type="vti" 577 578 run_cmd ${ns_a} ip link add vti${proto}_a type ${vti_type} local ${veth_a_addr} remote ${veth_b_addr} key 10 || return 1 579 run_cmd ${ns_b} ip link add vti${proto}_b type ${vti_type} local ${veth_b_addr} remote ${veth_a_addr} key 10 580 581 run_cmd ${ns_a} ip addr add ${vti_a_addr}/${vti_mask} dev vti${proto}_a 582 run_cmd ${ns_b} ip addr add ${vti_b_addr}/${vti_mask} dev vti${proto}_b 583 584 run_cmd ${ns_a} ip link set vti${proto}_a up 585 run_cmd ${ns_b} ip link set vti${proto}_b up 586} 587 588setup_vti4() { 589 setup_vti 4 ${veth4_a_addr} ${veth4_b_addr} ${tunnel4_a_addr} ${tunnel4_b_addr} ${tunnel4_mask} 590} 591 592setup_vti6() { 593 setup_vti 6 ${veth6_a_addr} ${veth6_b_addr} ${tunnel6_a_addr} ${tunnel6_b_addr} ${tunnel6_mask} 594} 595 596setup_vti4routed() { 597 setup_vti 4 ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1 ${tunnel4_a_addr} ${tunnel4_b_addr} ${tunnel4_mask} 598} 599 600setup_vti6routed() { 601 setup_vti 6 ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 ${tunnel6_a_addr} ${tunnel6_b_addr} ${tunnel6_mask} 602} 603 604setup_vxlan_or_geneve() { 605 type="${1}" 606 a_addr="${2}" 607 b_addr="${3}" 608 opts="${4}" 609 br_if_a="${5}" 610 611 if [ "${type}" = "vxlan" ]; then 612 opts="${opts} ttl 64 dstport 4789" 613 opts_a="local ${a_addr}" 614 opts_b="local ${b_addr}" 615 else 616 opts_a="" 617 opts_b="" 618 fi 619 620 run_cmd ${ns_a} ip link add ${type}_a type ${type} id 1 ${opts_a} remote ${b_addr} ${opts} || return 1 621 run_cmd ${ns_b} ip link add ${type}_b type ${type} id 1 ${opts_b} remote ${a_addr} ${opts} 622 623 if [ -n "${br_if_a}" ]; then 624 run_cmd ${ns_a} ip addr add ${tunnel4_a_addr}/${tunnel4_mask} dev ${br_if_a} 625 run_cmd ${ns_a} ip addr add ${tunnel6_a_addr}/${tunnel6_mask} dev ${br_if_a} 626 run_cmd ${ns_a} ip link set ${type}_a master ${br_if_a} 627 else 628 run_cmd ${ns_a} ip addr add ${tunnel4_a_addr}/${tunnel4_mask} dev ${type}_a 629 run_cmd ${ns_a} ip addr add ${tunnel6_a_addr}/${tunnel6_mask} dev ${type}_a 630 fi 631 632 run_cmd ${ns_b} ip addr add ${tunnel4_b_addr}/${tunnel4_mask} dev ${type}_b 633 run_cmd ${ns_b} ip addr add ${tunnel6_b_addr}/${tunnel6_mask} dev ${type}_b 634 635 run_cmd ${ns_a} ip link set ${type}_a up 636 run_cmd ${ns_b} ip link set ${type}_b up 637} 638 639setup_geneve4() { 640 setup_vxlan_or_geneve geneve ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1 "df set" 641} 642 643setup_vxlan4() { 644 setup_vxlan_or_geneve vxlan ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1 "df set" 645} 646 647setup_geneve6() { 648 setup_vxlan_or_geneve geneve ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 "" 649} 650 651setup_vxlan6() { 652 setup_vxlan_or_geneve vxlan ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 "" 653} 654 655setup_bridged_geneve4() { 656 setup_vxlan_or_geneve geneve ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1 "df set" "br0" 657} 658 659setup_bridged_vxlan4() { 660 setup_vxlan_or_geneve vxlan ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1 "df set" "br0" 661} 662 663setup_bridged_geneve6() { 664 setup_vxlan_or_geneve geneve ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 "" "br0" 665} 666 667setup_bridged_vxlan6() { 668 setup_vxlan_or_geneve vxlan ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 "" "br0" 669} 670 671setup_xfrm() { 672 proto=${1} 673 veth_a_addr="${2}" 674 veth_b_addr="${3}" 675 encap=${4} 676 677 run_cmd ${ns_a} ip -${proto} xfrm state add src ${veth_a_addr} dst ${veth_b_addr} spi 0x1000 proto esp aead 'rfc4106(gcm(aes))' 0x0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f 128 mode tunnel ${encap} || return 1 678 run_cmd ${ns_a} ip -${proto} xfrm state add src ${veth_b_addr} dst ${veth_a_addr} spi 0x1001 proto esp aead 'rfc4106(gcm(aes))' 0x0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f 128 mode tunnel ${encap} 679 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 680 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 681 682 run_cmd ${ns_b} ip -${proto} xfrm state add src ${veth_a_addr} dst ${veth_b_addr} spi 0x1000 proto esp aead 'rfc4106(gcm(aes))' 0x0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f 128 mode tunnel ${encap} 683 run_cmd ${ns_b} ip -${proto} xfrm state add src ${veth_b_addr} dst ${veth_a_addr} spi 0x1001 proto esp aead 'rfc4106(gcm(aes))' 0x0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f 128 mode tunnel ${encap} 684 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 685 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 686} 687 688setup_nettest_xfrm() { 689 which nettest >/dev/null 690 if [ $? -ne 0 ]; then 691 echo "'nettest' command not found; skipping tests" 692 return 1 693 fi 694 695 [ ${1} -eq 6 ] && proto="-6" || proto="" 696 port=${2} 697 698 run_cmd_bg "${ns_a}" nettest "${proto}" -q -D -s -x -p "${port}" -t 5 699 nettest_pids="${nettest_pids} $!" 700 701 run_cmd_bg "${ns_b}" nettest "${proto}" -q -D -s -x -p "${port}" -t 5 702 nettest_pids="${nettest_pids} $!" 703} 704 705setup_xfrm4() { 706 setup_xfrm 4 ${veth4_a_addr} ${veth4_b_addr} 707} 708 709setup_xfrm6() { 710 setup_xfrm 6 ${veth6_a_addr} ${veth6_b_addr} 711} 712 713setup_xfrm4udp() { 714 setup_xfrm 4 ${veth4_a_addr} ${veth4_b_addr} "encap espinudp 4500 4500 0.0.0.0" 715 setup_nettest_xfrm 4 4500 716} 717 718setup_xfrm6udp() { 719 setup_xfrm 6 ${veth6_a_addr} ${veth6_b_addr} "encap espinudp 4500 4500 0.0.0.0" 720 setup_nettest_xfrm 6 4500 721} 722 723setup_xfrm4udprouted() { 724 setup_xfrm 4 ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1 "encap espinudp 4500 4500 0.0.0.0" 725 setup_nettest_xfrm 4 4500 726} 727 728setup_xfrm6udprouted() { 729 setup_xfrm 6 ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 "encap espinudp 4500 4500 0.0.0.0" 730 setup_nettest_xfrm 6 4500 731} 732 733setup_routing_old() { 734 for i in ${routes}; do 735 [ "${ns}" = "" ] && ns="${i}" && continue 736 [ "${addr}" = "" ] && addr="${i}" && continue 737 [ "${gw}" = "" ] && gw="${i}" 738 739 ns_name="$(nsname ${ns})" 740 741 ip -n "${ns_name}" route add "${addr}" table "${rt_table}" via "${gw}" 742 743 ns=""; addr=""; gw="" 744 done 745} 746 747setup_routing_new() { 748 for i in ${nexthops}; do 749 [ "${ns}" = "" ] && ns="${i}" && continue 750 [ "${fam}" = "" ] && fam="${i}" && continue 751 [ "${nhid}" = "" ] && nhid="${i}" && continue 752 [ "${gw}" = "" ] && gw="${i}" && continue 753 [ "${dev}" = "" ] && dev="${i}" 754 755 ns_name="$(nsname ${ns})" 756 757 ip -n ${ns_name} -${fam} nexthop add id ${nhid} via ${gw} dev ${dev} 758 759 ns=""; fam=""; nhid=""; gw=""; dev="" 760 761 done 762 763 for i in ${routes_nh}; do 764 [ "${ns}" = "" ] && ns="${i}" && continue 765 [ "${fam}" = "" ] && fam="${i}" && continue 766 [ "${addr}" = "" ] && addr="${i}" && continue 767 [ "${nhid}" = "" ] && nhid="${i}" 768 769 ns_name="$(nsname ${ns})" 770 771 ip -n "${ns_name}" -"${fam}" route add "${addr}" table "${rt_table}" nhid "${nhid}" 772 773 ns=""; fam=""; addr=""; nhid="" 774 done 775} 776 777setup_routing() { 778 for i in ${NS_R1} ${NS_R2}; do 779 ip netns exec ${i} sysctl -q net/ipv4/ip_forward=1 780 ip netns exec ${i} sysctl -q net/ipv6/conf/all/forwarding=1 781 done 782 783 for i in ${routing_addrs}; do 784 [ "${ns}" = "" ] && ns="${i}" && continue 785 [ "${peer}" = "" ] && peer="${i}" && continue 786 [ "${segment}" = "" ] && segment="${i}" 787 788 ns_name="$(nsname ${ns})" 789 peer_name="$(nsname ${peer})" 790 if="veth_${ns}-${peer}" 791 ifpeer="veth_${peer}-${ns}" 792 793 # Create veth links 794 ip link add ${if} up netns ${ns_name} type veth peer name ${ifpeer} netns ${peer_name} || return 1 795 ip -n ${peer_name} link set dev ${ifpeer} up 796 797 # Add addresses 798 ip -n ${ns_name} addr add ${prefix4}.${segment}.1/24 dev ${if} 799 ip -n ${ns_name} addr add ${prefix6}:${segment}::1/64 dev ${if} 800 801 ip -n ${peer_name} addr add ${prefix4}.${segment}.2/24 dev ${ifpeer} 802 ip -n ${peer_name} addr add ${prefix6}:${segment}::2/64 dev ${ifpeer} 803 804 ns=""; peer=""; segment="" 805 done 806 807 if [ "$USE_NH" = "yes" ]; then 808 setup_routing_new 809 else 810 setup_routing_old 811 fi 812 813 return 0 814} 815 816setup_policy_routing() { 817 setup_routing 818 819 ip -netns "${NS_A}" -4 rule add dsfield "${policy_mark}" \ 820 table "${rt_table}" 821 822 # Set the IPv4 Don't Fragment bit with tc, since socat doesn't seem to 823 # have an option do to it. 824 tc -netns "${NS_A}" qdisc replace dev veth_A-R1 root prio 825 tc -netns "${NS_A}" qdisc replace dev veth_A-R2 root prio 826 tc -netns "${NS_A}" filter add dev veth_A-R1 \ 827 protocol ipv4 flower ip_proto udp \ 828 action pedit ex munge ip df set 0x40 pipe csum ip and udp 829 tc -netns "${NS_A}" filter add dev veth_A-R2 \ 830 protocol ipv4 flower ip_proto udp \ 831 action pedit ex munge ip df set 0x40 pipe csum ip and udp 832} 833 834setup_bridge() { 835 run_cmd ${ns_a} ip link add br0 type bridge || return $ksft_skip 836 run_cmd ${ns_a} ip link set br0 up 837 838 run_cmd ${ns_c} ip link add veth_C-A type veth peer name veth_A-C 839 run_cmd ${ns_c} ip link set veth_A-C netns ns-A 840 841 run_cmd ${ns_a} ip link set veth_A-C up 842 run_cmd ${ns_c} ip link set veth_C-A up 843 run_cmd ${ns_c} ip addr add ${veth4_c_addr}/${veth4_mask} dev veth_C-A 844 run_cmd ${ns_c} ip addr add ${veth6_c_addr}/${veth6_mask} dev veth_C-A 845 run_cmd ${ns_a} ip link set veth_A-C master br0 846} 847 848setup_ovs_vxlan_or_geneve() { 849 type="${1}" 850 a_addr="${2}" 851 b_addr="${3}" 852 853 if [ "${type}" = "vxlan" ]; then 854 opts="${opts} ttl 64 dstport 4789" 855 opts_b="local ${b_addr}" 856 fi 857 858 run_cmd ovs-vsctl add-port ovs_br0 ${type}_a -- \ 859 set interface ${type}_a type=${type} \ 860 options:remote_ip=${b_addr} options:key=1 options:csum=true || return 1 861 862 run_cmd ${ns_b} ip link add ${type}_b type ${type} id 1 ${opts_b} remote ${a_addr} ${opts} || return 1 863 864 run_cmd ${ns_b} ip addr add ${tunnel4_b_addr}/${tunnel4_mask} dev ${type}_b 865 run_cmd ${ns_b} ip addr add ${tunnel6_b_addr}/${tunnel6_mask} dev ${type}_b 866 867 run_cmd ${ns_b} ip link set ${type}_b up 868} 869 870setup_ovs_geneve4() { 871 setup_ovs_vxlan_or_geneve geneve ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1 872} 873 874setup_ovs_vxlan4() { 875 setup_ovs_vxlan_or_geneve vxlan ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1 876} 877 878setup_ovs_geneve6() { 879 setup_ovs_vxlan_or_geneve geneve ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 880} 881 882setup_ovs_vxlan6() { 883 setup_ovs_vxlan_or_geneve vxlan ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 884} 885 886setup_ovs_bridge() { 887 run_cmd ovs-vsctl add-br ovs_br0 || return $ksft_skip 888 run_cmd ip link set ovs_br0 up 889 890 run_cmd ${ns_c} ip link add veth_C-A type veth peer name veth_A-C 891 run_cmd ${ns_c} ip link set veth_A-C netns 1 892 893 run_cmd ip link set veth_A-C up 894 run_cmd ${ns_c} ip link set veth_C-A up 895 run_cmd ${ns_c} ip addr add ${veth4_c_addr}/${veth4_mask} dev veth_C-A 896 run_cmd ${ns_c} ip addr add ${veth6_c_addr}/${veth6_mask} dev veth_C-A 897 run_cmd ovs-vsctl add-port ovs_br0 veth_A-C 898 899 # Move veth_A-R1 to init 900 run_cmd ${ns_a} ip link set veth_A-R1 netns 1 901 run_cmd ip addr add ${prefix4}.${a_r1}.1/${veth4_mask} dev veth_A-R1 902 run_cmd ip addr add ${prefix6}:${a_r1}::1/${veth6_mask} dev veth_A-R1 903 run_cmd ip link set veth_A-R1 up 904 run_cmd ip route add ${prefix4}.${b_r1}.1 via ${prefix4}.${a_r1}.2 905 run_cmd ip route add ${prefix6}:${b_r1}::1 via ${prefix6}:${a_r1}::2 906} 907 908setup() { 909 [ "$(id -u)" -ne 0 ] && echo " need to run as root" && return $ksft_skip 910 911 for arg do 912 eval setup_${arg} || { echo " ${arg} not supported"; return 1; } 913 done 914} 915 916trace() { 917 [ $TRACING -eq 0 ] && return 918 919 for arg do 920 [ "${ns_cmd}" = "" ] && ns_cmd="${arg}" && continue 921 ${ns_cmd} tcpdump --immediate-mode -s 0 -i "${arg}" -w "${name}_${arg}.pcap" 2> /dev/null & 922 tcpdump_pids="${tcpdump_pids} $!" 923 ns_cmd= 924 done 925 sleep 1 926} 927 928cleanup() { 929 for pid in ${tcpdump_pids}; do 930 kill ${pid} 931 done 932 tcpdump_pids= 933 934 for pid in ${nettest_pids}; do 935 kill ${pid} 936 done 937 nettest_pids= 938 939 for pid in ${socat_pids}; do 940 kill "${pid}" 941 done 942 socat_pids= 943 944 for n in ${NS_A} ${NS_B} ${NS_C} ${NS_R1} ${NS_R2}; do 945 ip netns del ${n} 2> /dev/null 946 done 947 948 ip link del veth_A-C 2>/dev/null 949 ip link del veth_A-R1 2>/dev/null 950 ovs-vsctl --if-exists del-port vxlan_a 2>/dev/null 951 ovs-vsctl --if-exists del-br ovs_br0 2>/dev/null 952} 953 954mtu() { 955 ns_cmd="${1}" 956 dev="${2}" 957 mtu="${3}" 958 959 ${ns_cmd} ip link set dev ${dev} mtu ${mtu} 960} 961 962mtu_parse() { 963 input="${1}" 964 965 next=0 966 for i in ${input}; do 967 [ ${next} -eq 1 -a "${i}" = "lock" ] && next=2 && continue 968 [ ${next} -eq 1 ] && echo "${i}" && return 969 [ ${next} -eq 2 ] && echo "lock ${i}" && return 970 [ "${i}" = "mtu" ] && next=1 971 done 972} 973 974link_get() { 975 ns_cmd="${1}" 976 name="${2}" 977 978 ${ns_cmd} ip link show dev "${name}" 979} 980 981link_get_mtu() { 982 ns_cmd="${1}" 983 name="${2}" 984 985 mtu_parse "$(link_get "${ns_cmd}" ${name})" 986} 987 988route_get_dst_exception() { 989 ns_cmd="${1}" 990 dst="${2}" 991 dsfield="${3}" 992 993 if [ -z "${dsfield}" ]; then 994 dsfield=0 995 fi 996 997 ${ns_cmd} ip route get "${dst}" dsfield "${dsfield}" 998} 999 1000route_get_dst_pmtu_from_exception() { 1001 ns_cmd="${1}" 1002 dst="${2}" 1003 dsfield="${3}" 1004 1005 mtu_parse "$(route_get_dst_exception "${ns_cmd}" "${dst}" "${dsfield}")" 1006} 1007 1008check_pmtu_value() { 1009 expected="${1}" 1010 value="${2}" 1011 event="${3}" 1012 1013 [ "${expected}" = "any" ] && [ -n "${value}" ] && return 0 1014 [ "${value}" = "${expected}" ] && return 0 1015 [ -z "${value}" ] && err " PMTU exception wasn't created after ${event}" && return 1 1016 [ -z "${expected}" ] && err " PMTU exception shouldn't exist after ${event}" && return 1 1017 err " found PMTU exception with incorrect MTU ${value}, expected ${expected}, after ${event}" 1018 return 1 1019} 1020 1021test_pmtu_ipvX() { 1022 family=${1} 1023 1024 setup namespaces routing || return $ksft_skip 1025 trace "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \ 1026 "${ns_r1}" veth_R1-B "${ns_b}" veth_B-R1 \ 1027 "${ns_a}" veth_A-R2 "${ns_r2}" veth_R2-A \ 1028 "${ns_r2}" veth_R2-B "${ns_b}" veth_B-R2 1029 1030 if [ ${family} -eq 4 ]; then 1031 ping=ping 1032 dst1="${prefix4}.${b_r1}.1" 1033 dst2="${prefix4}.${b_r2}.1" 1034 else 1035 ping=${ping6} 1036 dst1="${prefix6}:${b_r1}::1" 1037 dst2="${prefix6}:${b_r2}::1" 1038 fi 1039 1040 # Set up initial MTU values 1041 mtu "${ns_a}" veth_A-R1 2000 1042 mtu "${ns_r1}" veth_R1-A 2000 1043 mtu "${ns_r1}" veth_R1-B 1400 1044 mtu "${ns_b}" veth_B-R1 1400 1045 1046 mtu "${ns_a}" veth_A-R2 2000 1047 mtu "${ns_r2}" veth_R2-A 2000 1048 mtu "${ns_r2}" veth_R2-B 1500 1049 mtu "${ns_b}" veth_B-R2 1500 1050 1051 # Create route exceptions 1052 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1800 ${dst1} 1053 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1800 ${dst2} 1054 1055 # Check that exceptions have been created with the correct PMTU 1056 pmtu_1="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst1})" 1057 check_pmtu_value "1400" "${pmtu_1}" "exceeding MTU" || return 1 1058 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})" 1059 check_pmtu_value "1500" "${pmtu_2}" "exceeding MTU" || return 1 1060 1061 # Decrease local MTU below PMTU, check for PMTU decrease in route exception 1062 mtu "${ns_a}" veth_A-R1 1300 1063 mtu "${ns_r1}" veth_R1-A 1300 1064 pmtu_1="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst1})" 1065 check_pmtu_value "1300" "${pmtu_1}" "decreasing local MTU" || return 1 1066 # Second exception shouldn't be modified 1067 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})" 1068 check_pmtu_value "1500" "${pmtu_2}" "changing local MTU on a link not on this path" || return 1 1069 1070 # Increase MTU, check for PMTU increase in route exception 1071 mtu "${ns_a}" veth_A-R1 1700 1072 mtu "${ns_r1}" veth_R1-A 1700 1073 pmtu_1="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst1})" 1074 check_pmtu_value "1700" "${pmtu_1}" "increasing local MTU" || return 1 1075 # Second exception shouldn't be modified 1076 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})" 1077 check_pmtu_value "1500" "${pmtu_2}" "changing local MTU on a link not on this path" || return 1 1078 1079 # Skip PMTU locking tests for IPv6 1080 [ $family -eq 6 ] && return 0 1081 1082 # Decrease remote MTU on path via R2, get new exception 1083 mtu "${ns_r2}" veth_R2-B 400 1084 mtu "${ns_b}" veth_B-R2 400 1085 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1400 ${dst2} 1086 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})" 1087 check_pmtu_value "lock 552" "${pmtu_2}" "exceeding MTU, with MTU < min_pmtu" || return 1 1088 1089 # Decrease local MTU below PMTU 1090 mtu "${ns_a}" veth_A-R2 500 1091 mtu "${ns_r2}" veth_R2-A 500 1092 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})" 1093 check_pmtu_value "500" "${pmtu_2}" "decreasing local MTU" || return 1 1094 1095 # Increase local MTU 1096 mtu "${ns_a}" veth_A-R2 1500 1097 mtu "${ns_r2}" veth_R2-A 1500 1098 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})" 1099 check_pmtu_value "1500" "${pmtu_2}" "increasing local MTU" || return 1 1100 1101 # Get new exception 1102 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1400 ${dst2} 1103 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})" 1104 check_pmtu_value "lock 552" "${pmtu_2}" "exceeding MTU, with MTU < min_pmtu" || return 1 1105} 1106 1107test_pmtu_ipv4_exception() { 1108 test_pmtu_ipvX 4 1109} 1110 1111test_pmtu_ipv6_exception() { 1112 test_pmtu_ipvX 6 1113} 1114 1115test_pmtu_ipv4_dscp_icmp_exception() { 1116 rt_table=100 1117 1118 setup namespaces policy_routing || return $ksft_skip 1119 trace "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \ 1120 "${ns_r1}" veth_R1-B "${ns_b}" veth_B-R1 \ 1121 "${ns_a}" veth_A-R2 "${ns_r2}" veth_R2-A \ 1122 "${ns_r2}" veth_R2-B "${ns_b}" veth_B-R2 1123 1124 # Set up initial MTU values 1125 mtu "${ns_a}" veth_A-R1 2000 1126 mtu "${ns_r1}" veth_R1-A 2000 1127 mtu "${ns_r1}" veth_R1-B 1400 1128 mtu "${ns_b}" veth_B-R1 1400 1129 1130 mtu "${ns_a}" veth_A-R2 2000 1131 mtu "${ns_r2}" veth_R2-A 2000 1132 mtu "${ns_r2}" veth_R2-B 1500 1133 mtu "${ns_b}" veth_B-R2 1500 1134 1135 len=$((2000 - 20 - 8)) # Fills MTU of veth_A-R1 1136 1137 dst1="${prefix4}.${b_r1}.1" 1138 dst2="${prefix4}.${b_r2}.1" 1139 1140 # Create route exceptions 1141 dsfield=${policy_mark} # No ECN bit set (Not-ECT) 1142 run_cmd "${ns_a}" ping -q -M want -Q "${dsfield}" -c 1 -w 1 -s "${len}" "${dst1}" 1143 1144 dsfield=$(printf "%#x" $((policy_mark + 0x02))) # ECN=2 (ECT(0)) 1145 run_cmd "${ns_a}" ping -q -M want -Q "${dsfield}" -c 1 -w 1 -s "${len}" "${dst2}" 1146 1147 # Check that exceptions have been created with the correct PMTU 1148 pmtu_1="$(route_get_dst_pmtu_from_exception "${ns_a}" "${dst1}" "${policy_mark}")" 1149 check_pmtu_value "1400" "${pmtu_1}" "exceeding MTU" || return 1 1150 1151 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" "${dst2}" "${policy_mark}")" 1152 check_pmtu_value "1500" "${pmtu_2}" "exceeding MTU" || return 1 1153} 1154 1155test_pmtu_ipv4_dscp_udp_exception() { 1156 rt_table=100 1157 1158 if ! which socat > /dev/null 2>&1; then 1159 echo "'socat' command not found; skipping tests" 1160 return $ksft_skip 1161 fi 1162 1163 setup namespaces policy_routing || return $ksft_skip 1164 trace "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \ 1165 "${ns_r1}" veth_R1-B "${ns_b}" veth_B-R1 \ 1166 "${ns_a}" veth_A-R2 "${ns_r2}" veth_R2-A \ 1167 "${ns_r2}" veth_R2-B "${ns_b}" veth_B-R2 1168 1169 # Set up initial MTU values 1170 mtu "${ns_a}" veth_A-R1 2000 1171 mtu "${ns_r1}" veth_R1-A 2000 1172 mtu "${ns_r1}" veth_R1-B 1400 1173 mtu "${ns_b}" veth_B-R1 1400 1174 1175 mtu "${ns_a}" veth_A-R2 2000 1176 mtu "${ns_r2}" veth_R2-A 2000 1177 mtu "${ns_r2}" veth_R2-B 1500 1178 mtu "${ns_b}" veth_B-R2 1500 1179 1180 len=$((2000 - 20 - 8)) # Fills MTU of veth_A-R1 1181 1182 dst1="${prefix4}.${b_r1}.1" 1183 dst2="${prefix4}.${b_r2}.1" 1184 1185 # Create route exceptions 1186 run_cmd_bg "${ns_b}" socat UDP-LISTEN:50000 OPEN:/dev/null,wronly=1 1187 socat_pids="${socat_pids} $!" 1188 1189 dsfield=${policy_mark} # No ECN bit set (Not-ECT) 1190 run_cmd "${ns_a}" socat OPEN:/dev/zero,rdonly=1,readbytes="${len}" \ 1191 UDP:"${dst1}":50000,tos="${dsfield}" 1192 1193 dsfield=$(printf "%#x" $((policy_mark + 0x02))) # ECN=2 (ECT(0)) 1194 run_cmd "${ns_a}" socat OPEN:/dev/zero,rdonly=1,readbytes="${len}" \ 1195 UDP:"${dst2}":50000,tos="${dsfield}" 1196 1197 # Check that exceptions have been created with the correct PMTU 1198 pmtu_1="$(route_get_dst_pmtu_from_exception "${ns_a}" "${dst1}" "${policy_mark}")" 1199 check_pmtu_value "1400" "${pmtu_1}" "exceeding MTU" || return 1 1200 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" "${dst2}" "${policy_mark}")" 1201 check_pmtu_value "1500" "${pmtu_2}" "exceeding MTU" || return 1 1202} 1203 1204test_pmtu_ipvX_over_vxlanY_or_geneveY_exception() { 1205 type=${1} 1206 family=${2} 1207 outer_family=${3} 1208 ll_mtu=4000 1209 1210 if [ ${outer_family} -eq 4 ]; then 1211 setup namespaces routing ${type}4 || return $ksft_skip 1212 # IPv4 header UDP header VXLAN/GENEVE header Ethernet header 1213 exp_mtu=$((${ll_mtu} - 20 - 8 - 8 - 14)) 1214 else 1215 setup namespaces routing ${type}6 || return $ksft_skip 1216 # IPv6 header UDP header VXLAN/GENEVE header Ethernet header 1217 exp_mtu=$((${ll_mtu} - 40 - 8 - 8 - 14)) 1218 fi 1219 1220 trace "${ns_a}" ${type}_a "${ns_b}" ${type}_b \ 1221 "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \ 1222 "${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B 1223 1224 if [ ${family} -eq 4 ]; then 1225 ping=ping 1226 dst=${tunnel4_b_addr} 1227 else 1228 ping=${ping6} 1229 dst=${tunnel6_b_addr} 1230 fi 1231 1232 # Create route exception by exceeding link layer MTU 1233 mtu "${ns_a}" veth_A-R1 $((${ll_mtu} + 1000)) 1234 mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000)) 1235 mtu "${ns_b}" veth_B-R1 ${ll_mtu} 1236 mtu "${ns_r1}" veth_R1-B ${ll_mtu} 1237 1238 mtu "${ns_a}" ${type}_a $((${ll_mtu} + 1000)) 1239 mtu "${ns_b}" ${type}_b $((${ll_mtu} + 1000)) 1240 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${dst} 1241 1242 # Check that exception was created 1243 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst})" 1244 check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on ${type} interface" 1245} 1246 1247test_pmtu_ipv4_vxlan4_exception() { 1248 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception vxlan 4 4 1249} 1250 1251test_pmtu_ipv6_vxlan4_exception() { 1252 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception vxlan 6 4 1253} 1254 1255test_pmtu_ipv4_geneve4_exception() { 1256 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception geneve 4 4 1257} 1258 1259test_pmtu_ipv6_geneve4_exception() { 1260 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception geneve 6 4 1261} 1262 1263test_pmtu_ipv4_vxlan6_exception() { 1264 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception vxlan 4 6 1265} 1266 1267test_pmtu_ipv6_vxlan6_exception() { 1268 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception vxlan 6 6 1269} 1270 1271test_pmtu_ipv4_geneve6_exception() { 1272 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception geneve 4 6 1273} 1274 1275test_pmtu_ipv6_geneve6_exception() { 1276 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception geneve 6 6 1277} 1278 1279test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception() { 1280 type=${1} 1281 family=${2} 1282 outer_family=${3} 1283 ll_mtu=4000 1284 1285 if [ ${outer_family} -eq 4 ]; then 1286 setup namespaces routing bridge bridged_${type}4 || return $ksft_skip 1287 # IPv4 header UDP header VXLAN/GENEVE header Ethernet header 1288 exp_mtu=$((${ll_mtu} - 20 - 8 - 8 - 14)) 1289 else 1290 setup namespaces routing bridge bridged_${type}6 || return $ksft_skip 1291 # IPv6 header UDP header VXLAN/GENEVE header Ethernet header 1292 exp_mtu=$((${ll_mtu} - 40 - 8 - 8 - 14)) 1293 fi 1294 1295 trace "${ns_a}" ${type}_a "${ns_b}" ${type}_b \ 1296 "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \ 1297 "${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B \ 1298 "${ns_a}" br0 "${ns_a}" veth-A-C \ 1299 "${ns_c}" veth_C-A 1300 1301 if [ ${family} -eq 4 ]; then 1302 ping=ping 1303 dst=${tunnel4_b_addr} 1304 else 1305 ping=${ping6} 1306 dst=${tunnel6_b_addr} 1307 fi 1308 1309 # Create route exception by exceeding link layer MTU 1310 mtu "${ns_a}" veth_A-R1 $((${ll_mtu} + 1000)) 1311 mtu "${ns_a}" br0 $((${ll_mtu} + 1000)) 1312 mtu "${ns_a}" veth_A-C $((${ll_mtu} + 1000)) 1313 mtu "${ns_c}" veth_C-A $((${ll_mtu} + 1000)) 1314 mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000)) 1315 mtu "${ns_b}" veth_B-R1 ${ll_mtu} 1316 mtu "${ns_r1}" veth_R1-B ${ll_mtu} 1317 1318 mtu "${ns_a}" ${type}_a $((${ll_mtu} + 1000)) 1319 mtu "${ns_b}" ${type}_b $((${ll_mtu} + 1000)) 1320 1321 run_cmd ${ns_c} ${ping} -q -M want -i 0.1 -c 10 -s $((${ll_mtu} + 500)) ${dst} || return 1 1322 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${dst} || return 1 1323 1324 # Check that exceptions were created 1325 pmtu="$(route_get_dst_pmtu_from_exception "${ns_c}" ${dst})" 1326 check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on bridged ${type} interface" 1327 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst})" 1328 check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on locally bridged ${type} interface" 1329} 1330 1331test_pmtu_ipv4_br_vxlan4_exception() { 1332 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception vxlan 4 4 1333} 1334 1335test_pmtu_ipv6_br_vxlan4_exception() { 1336 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception vxlan 6 4 1337} 1338 1339test_pmtu_ipv4_br_geneve4_exception() { 1340 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception geneve 4 4 1341} 1342 1343test_pmtu_ipv6_br_geneve4_exception() { 1344 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception geneve 6 4 1345} 1346 1347test_pmtu_ipv4_br_vxlan6_exception() { 1348 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception vxlan 4 6 1349} 1350 1351test_pmtu_ipv6_br_vxlan6_exception() { 1352 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception vxlan 6 6 1353} 1354 1355test_pmtu_ipv4_br_geneve6_exception() { 1356 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception geneve 4 6 1357} 1358 1359test_pmtu_ipv6_br_geneve6_exception() { 1360 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception geneve 6 6 1361} 1362 1363test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception() { 1364 type=${1} 1365 family=${2} 1366 outer_family=${3} 1367 ll_mtu=4000 1368 1369 if [ ${outer_family} -eq 4 ]; then 1370 setup namespaces routing ovs_bridge ovs_${type}4 || return $ksft_skip 1371 # IPv4 header UDP header VXLAN/GENEVE header Ethernet header 1372 exp_mtu=$((${ll_mtu} - 20 - 8 - 8 - 14)) 1373 else 1374 setup namespaces routing ovs_bridge ovs_${type}6 || return $ksft_skip 1375 # IPv6 header UDP header VXLAN/GENEVE header Ethernet header 1376 exp_mtu=$((${ll_mtu} - 40 - 8 - 8 - 14)) 1377 fi 1378 1379 if [ "${type}" = "vxlan" ]; then 1380 tun_a="vxlan_sys_4789" 1381 elif [ "${type}" = "geneve" ]; then 1382 tun_a="genev_sys_6081" 1383 fi 1384 1385 trace "" "${tun_a}" "${ns_b}" ${type}_b \ 1386 "" veth_A-R1 "${ns_r1}" veth_R1-A \ 1387 "${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B \ 1388 "" ovs_br0 "" veth-A-C \ 1389 "${ns_c}" veth_C-A 1390 1391 if [ ${family} -eq 4 ]; then 1392 ping=ping 1393 dst=${tunnel4_b_addr} 1394 else 1395 ping=${ping6} 1396 dst=${tunnel6_b_addr} 1397 fi 1398 1399 # Create route exception by exceeding link layer MTU 1400 mtu "" veth_A-R1 $((${ll_mtu} + 1000)) 1401 mtu "" ovs_br0 $((${ll_mtu} + 1000)) 1402 mtu "" veth_A-C $((${ll_mtu} + 1000)) 1403 mtu "${ns_c}" veth_C-A $((${ll_mtu} + 1000)) 1404 mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000)) 1405 mtu "${ns_b}" veth_B-R1 ${ll_mtu} 1406 mtu "${ns_r1}" veth_R1-B ${ll_mtu} 1407 1408 mtu "" ${tun_a} $((${ll_mtu} + 1000)) 1409 mtu "${ns_b}" ${type}_b $((${ll_mtu} + 1000)) 1410 1411 run_cmd ${ns_c} ${ping} -q -M want -i 0.1 -c 20 -s $((${ll_mtu} + 500)) ${dst} || return 1 1412 1413 # Check that exceptions were created 1414 pmtu="$(route_get_dst_pmtu_from_exception "${ns_c}" ${dst})" 1415 check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on Open vSwitch ${type} interface" 1416} 1417 1418test_pmtu_ipv4_ovs_vxlan4_exception() { 1419 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception vxlan 4 4 1420} 1421 1422test_pmtu_ipv6_ovs_vxlan4_exception() { 1423 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception vxlan 6 4 1424} 1425 1426test_pmtu_ipv4_ovs_geneve4_exception() { 1427 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception geneve 4 4 1428} 1429 1430test_pmtu_ipv6_ovs_geneve4_exception() { 1431 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception geneve 6 4 1432} 1433 1434test_pmtu_ipv4_ovs_vxlan6_exception() { 1435 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception vxlan 4 6 1436} 1437 1438test_pmtu_ipv6_ovs_vxlan6_exception() { 1439 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception vxlan 6 6 1440} 1441 1442test_pmtu_ipv4_ovs_geneve6_exception() { 1443 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception geneve 4 6 1444} 1445 1446test_pmtu_ipv6_ovs_geneve6_exception() { 1447 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception geneve 6 6 1448} 1449 1450test_pmtu_ipvX_over_fouY_or_gueY() { 1451 inner_family=${1} 1452 outer_family=${2} 1453 encap=${3} 1454 ll_mtu=4000 1455 1456 setup namespaces routing ${encap}${outer_family}${inner_family} || return $ksft_skip 1457 trace "${ns_a}" ${encap}_a "${ns_b}" ${encap}_b \ 1458 "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \ 1459 "${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B 1460 1461 if [ ${inner_family} -eq 4 ]; then 1462 ping=ping 1463 dst=${tunnel4_b_addr} 1464 else 1465 ping=${ping6} 1466 dst=${tunnel6_b_addr} 1467 fi 1468 1469 if [ "${encap}" = "gue" ]; then 1470 encap_overhead=4 1471 else 1472 encap_overhead=0 1473 fi 1474 1475 if [ ${outer_family} -eq 4 ]; then 1476 # IPv4 header UDP header 1477 exp_mtu=$((${ll_mtu} - 20 - 8 - ${encap_overhead})) 1478 else 1479 # IPv6 header Option 4 UDP header 1480 exp_mtu=$((${ll_mtu} - 40 - 8 - 8 - ${encap_overhead})) 1481 fi 1482 1483 # Create route exception by exceeding link layer MTU 1484 mtu "${ns_a}" veth_A-R1 $((${ll_mtu} + 1000)) 1485 mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000)) 1486 mtu "${ns_b}" veth_B-R1 ${ll_mtu} 1487 mtu "${ns_r1}" veth_R1-B ${ll_mtu} 1488 1489 mtu "${ns_a}" ${encap}_a $((${ll_mtu} + 1000)) 1490 mtu "${ns_b}" ${encap}_b $((${ll_mtu} + 1000)) 1491 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${dst} 1492 1493 # Check that exception was created 1494 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst})" 1495 check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on ${encap} interface" 1496} 1497 1498test_pmtu_ipv4_fou4_exception() { 1499 test_pmtu_ipvX_over_fouY_or_gueY 4 4 fou 1500} 1501 1502test_pmtu_ipv6_fou4_exception() { 1503 test_pmtu_ipvX_over_fouY_or_gueY 6 4 fou 1504} 1505 1506test_pmtu_ipv4_fou6_exception() { 1507 test_pmtu_ipvX_over_fouY_or_gueY 4 6 fou 1508} 1509 1510test_pmtu_ipv6_fou6_exception() { 1511 test_pmtu_ipvX_over_fouY_or_gueY 6 6 fou 1512} 1513 1514test_pmtu_ipv4_gue4_exception() { 1515 test_pmtu_ipvX_over_fouY_or_gueY 4 4 gue 1516} 1517 1518test_pmtu_ipv6_gue4_exception() { 1519 test_pmtu_ipvX_over_fouY_or_gueY 6 4 gue 1520} 1521 1522test_pmtu_ipv4_gue6_exception() { 1523 test_pmtu_ipvX_over_fouY_or_gueY 4 6 gue 1524} 1525 1526test_pmtu_ipv6_gue6_exception() { 1527 test_pmtu_ipvX_over_fouY_or_gueY 6 6 gue 1528} 1529 1530test_pmtu_ipvX_over_ipvY_exception() { 1531 inner=${1} 1532 outer=${2} 1533 ll_mtu=4000 1534 1535 setup namespaces routing ip${inner}ip${outer} || return $ksft_skip 1536 1537 trace "${ns_a}" ip_a "${ns_b}" ip_b \ 1538 "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \ 1539 "${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B 1540 1541 if [ ${inner} -eq 4 ]; then 1542 ping=ping 1543 dst=${tunnel4_b_addr} 1544 else 1545 ping=${ping6} 1546 dst=${tunnel6_b_addr} 1547 fi 1548 1549 if [ ${outer} -eq 4 ]; then 1550 # IPv4 header 1551 exp_mtu=$((${ll_mtu} - 20)) 1552 else 1553 # IPv6 header Option 4 1554 exp_mtu=$((${ll_mtu} - 40 - 8)) 1555 fi 1556 1557 # Create route exception by exceeding link layer MTU 1558 mtu "${ns_a}" veth_A-R1 $((${ll_mtu} + 1000)) 1559 mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000)) 1560 mtu "${ns_b}" veth_B-R1 ${ll_mtu} 1561 mtu "${ns_r1}" veth_R1-B ${ll_mtu} 1562 1563 mtu "${ns_a}" ip_a $((${ll_mtu} + 1000)) || return 1564 mtu "${ns_b}" ip_b $((${ll_mtu} + 1000)) || return 1565 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${dst} 1566 1567 # Check that exception was created 1568 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst})" 1569 check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on ip${inner}ip${outer} interface" 1570} 1571 1572test_pmtu_ipv4_ipv4_exception() { 1573 test_pmtu_ipvX_over_ipvY_exception 4 4 1574} 1575 1576test_pmtu_ipv6_ipv4_exception() { 1577 test_pmtu_ipvX_over_ipvY_exception 6 4 1578} 1579 1580test_pmtu_ipv4_ipv6_exception() { 1581 test_pmtu_ipvX_over_ipvY_exception 4 6 1582} 1583 1584test_pmtu_ipv6_ipv6_exception() { 1585 test_pmtu_ipvX_over_ipvY_exception 6 6 1586} 1587 1588test_pmtu_vti4_exception() { 1589 setup namespaces veth vti4 xfrm4 || return $ksft_skip 1590 trace "${ns_a}" veth_a "${ns_b}" veth_b \ 1591 "${ns_a}" vti4_a "${ns_b}" vti4_b 1592 1593 veth_mtu=1500 1594 vti_mtu=$((veth_mtu - 20)) 1595 1596 # SPI SN IV ICV pad length next header 1597 esp_payload_rfc4106=$((vti_mtu - 4 - 4 - 8 - 16 - 1 - 1)) 1598 ping_payload=$((esp_payload_rfc4106 - 28)) 1599 1600 mtu "${ns_a}" veth_a ${veth_mtu} 1601 mtu "${ns_b}" veth_b ${veth_mtu} 1602 mtu "${ns_a}" vti4_a ${vti_mtu} 1603 mtu "${ns_b}" vti4_b ${vti_mtu} 1604 1605 # Send DF packet without exceeding link layer MTU, check that no 1606 # exception is created 1607 run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s ${ping_payload} ${tunnel4_b_addr} 1608 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel4_b_addr})" 1609 check_pmtu_value "" "${pmtu}" "sending packet smaller than PMTU (IP payload length ${esp_payload_rfc4106})" || return 1 1610 1611 # Now exceed link layer MTU by one byte, check that exception is created 1612 # with the right PMTU value 1613 run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s $((ping_payload + 1)) ${tunnel4_b_addr} 1614 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel4_b_addr})" 1615 check_pmtu_value "${esp_payload_rfc4106}" "${pmtu}" "exceeding PMTU (IP payload length $((esp_payload_rfc4106 + 1)))" 1616} 1617 1618test_pmtu_vti6_exception() { 1619 setup namespaces veth vti6 xfrm6 || return $ksft_skip 1620 trace "${ns_a}" veth_a "${ns_b}" veth_b \ 1621 "${ns_a}" vti6_a "${ns_b}" vti6_b 1622 fail=0 1623 1624 # Create route exception by exceeding link layer MTU 1625 mtu "${ns_a}" veth_a 4000 1626 mtu "${ns_b}" veth_b 4000 1627 mtu "${ns_a}" vti6_a 5000 1628 mtu "${ns_b}" vti6_b 5000 1629 run_cmd ${ns_a} ${ping6} -q -i 0.1 -w 1 -s 60000 ${tunnel6_b_addr} 1630 1631 # Check that exception was created 1632 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})" 1633 check_pmtu_value any "${pmtu}" "creating tunnel exceeding link layer MTU" || return 1 1634 1635 # Decrease tunnel MTU, check for PMTU decrease in route exception 1636 mtu "${ns_a}" vti6_a 3000 1637 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})" 1638 check_pmtu_value "3000" "${pmtu}" "decreasing tunnel MTU" || fail=1 1639 1640 # Increase tunnel MTU, check for PMTU increase in route exception 1641 mtu "${ns_a}" vti6_a 9000 1642 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})" 1643 check_pmtu_value "9000" "${pmtu}" "increasing tunnel MTU" || fail=1 1644 1645 return ${fail} 1646} 1647 1648test_pmtu_vti4_udp_exception() { 1649 setup namespaces veth vti4 xfrm4udp || return $ksft_skip 1650 trace "${ns_a}" veth_a "${ns_b}" veth_b \ 1651 "${ns_a}" vti4_a "${ns_b}" vti4_b 1652 1653 veth_mtu=1500 1654 vti_mtu=$((veth_mtu - 20)) 1655 1656 # UDP SPI SN IV ICV pad length next header 1657 esp_payload_rfc4106=$((vti_mtu - 8 - 4 - 4 - 8 - 16 - 1 - 1)) 1658 ping_payload=$((esp_payload_rfc4106 - 28)) 1659 1660 mtu "${ns_a}" veth_a ${veth_mtu} 1661 mtu "${ns_b}" veth_b ${veth_mtu} 1662 mtu "${ns_a}" vti4_a ${vti_mtu} 1663 mtu "${ns_b}" vti4_b ${vti_mtu} 1664 1665 # Send DF packet without exceeding link layer MTU, check that no 1666 # exception is created 1667 run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s ${ping_payload} ${tunnel4_b_addr} 1668 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel4_b_addr})" 1669 check_pmtu_value "" "${pmtu}" "sending packet smaller than PMTU (IP payload length ${esp_payload_rfc4106})" || return 1 1670 1671 # Now exceed link layer MTU by one byte, check that exception is created 1672 # with the right PMTU value 1673 run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s $((ping_payload + 1)) ${tunnel4_b_addr} 1674 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel4_b_addr})" 1675 check_pmtu_value "${esp_payload_rfc4106}" "${pmtu}" "exceeding PMTU (IP payload length $((esp_payload_rfc4106 + 1)))" 1676} 1677 1678test_pmtu_vti6_udp_exception() { 1679 setup namespaces veth vti6 xfrm6udp || return $ksft_skip 1680 trace "${ns_a}" veth_a "${ns_b}" veth_b \ 1681 "${ns_a}" vti6_a "${ns_b}" vti6_b 1682 fail=0 1683 1684 # Create route exception by exceeding link layer MTU 1685 mtu "${ns_a}" veth_a 4000 1686 mtu "${ns_b}" veth_b 4000 1687 mtu "${ns_a}" vti6_a 5000 1688 mtu "${ns_b}" vti6_b 5000 1689 run_cmd ${ns_a} ${ping6} -q -i 0.1 -w 1 -s 60000 ${tunnel6_b_addr} 1690 1691 # Check that exception was created 1692 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})" 1693 check_pmtu_value any "${pmtu}" "creating tunnel exceeding link layer MTU" || return 1 1694 1695 # Decrease tunnel MTU, check for PMTU decrease in route exception 1696 mtu "${ns_a}" vti6_a 3000 1697 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})" 1698 check_pmtu_value "3000" "${pmtu}" "decreasing tunnel MTU" || fail=1 1699 1700 # Increase tunnel MTU, check for PMTU increase in route exception 1701 mtu "${ns_a}" vti6_a 9000 1702 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})" 1703 check_pmtu_value "9000" "${pmtu}" "increasing tunnel MTU" || fail=1 1704 1705 return ${fail} 1706} 1707 1708test_pmtu_vti4_udp_routed_exception() { 1709 setup namespaces routing vti4routed xfrm4udprouted || return $ksft_skip 1710 trace "${ns_a}" veth_A-R1 "${ns_b}" veth_B-R1 \ 1711 "${ns_a}" vti4_a "${ns_b}" vti4_b 1712 1713 veth_mtu=1500 1714 vti_mtu=$((veth_mtu - 20)) 1715 1716 # UDP SPI SN IV ICV pad length next header 1717 esp_payload_rfc4106=$((vti_mtu - 8 - 4 - 4 - 8 - 16 - 1 - 1)) 1718 ping_payload=$((esp_payload_rfc4106 - 28)) 1719 1720 mtu "${ns_a}" veth_A-R1 ${veth_mtu} 1721 mtu "${ns_r1}" veth_R1-A ${veth_mtu} 1722 mtu "${ns_b}" veth_B-R1 ${veth_mtu} 1723 mtu "${ns_r1}" veth_R1-B ${veth_mtu} 1724 1725 mtu "${ns_a}" vti4_a ${vti_mtu} 1726 mtu "${ns_b}" vti4_b ${vti_mtu} 1727 1728 # Send DF packet without exceeding link layer MTU, check that no 1729 # exception is created 1730 run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s ${ping_payload} ${tunnel4_b_addr} 1731 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel4_b_addr})" 1732 check_pmtu_value "" "${pmtu}" "sending packet smaller than PMTU (IP payload length ${esp_payload_rfc4106})" || return 1 1733 1734 # Now decrease link layer MTU by 8 bytes on R1, check that exception is created 1735 # with the right PMTU value 1736 mtu "${ns_r1}" veth_R1-B $((veth_mtu - 8)) 1737 run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s $((ping_payload)) ${tunnel4_b_addr} 1738 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel4_b_addr})" 1739 check_pmtu_value "$((esp_payload_rfc4106 - 8))" "${pmtu}" "exceeding PMTU (IP payload length $((esp_payload_rfc4106)))" 1740} 1741 1742test_pmtu_vti6_udp_routed_exception() { 1743 setup namespaces routing vti6routed xfrm6udprouted || return $ksft_skip 1744 trace "${ns_a}" veth_A-R1 "${ns_b}" veth_B-R1 \ 1745 "${ns_a}" vti6_a "${ns_b}" vti6_b 1746 1747 veth_mtu=1500 1748 vti_mtu=$((veth_mtu - 40)) 1749 1750 # UDP SPI SN IV ICV pad length next header 1751 esp_payload_rfc4106=$((vti_mtu - 8 - 4 - 4 - 8 - 16 - 1 - 1)) 1752 ping_payload=$((esp_payload_rfc4106 - 48)) 1753 1754 mtu "${ns_a}" veth_A-R1 ${veth_mtu} 1755 mtu "${ns_r1}" veth_R1-A ${veth_mtu} 1756 mtu "${ns_b}" veth_B-R1 ${veth_mtu} 1757 mtu "${ns_r1}" veth_R1-B ${veth_mtu} 1758 1759 # mtu "${ns_a}" vti6_a ${vti_mtu} 1760 # mtu "${ns_b}" vti6_b ${vti_mtu} 1761 1762 run_cmd ${ns_a} ${ping6} -q -M want -i 0.1 -w 1 -s ${ping_payload} ${tunnel6_b_addr} 1763 1764 # Check that exception was not created 1765 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})" 1766 check_pmtu_value "" "${pmtu}" "sending packet smaller than PMTU (IP payload length ${esp_payload_rfc4106})" || return 1 1767 1768 # Now decrease link layer MTU by 8 bytes on R1, check that exception is created 1769 # with the right PMTU value 1770 mtu "${ns_r1}" veth_R1-B $((veth_mtu - 8)) 1771 run_cmd ${ns_a} ${ping6} -q -M want -i 0.1 -w 1 -s $((ping_payload)) ${tunnel6_b_addr} 1772 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})" 1773 check_pmtu_value "$((esp_payload_rfc4106 - 8))" "${pmtu}" "exceeding PMTU (IP payload length $((esp_payload_rfc4106)))" 1774 1775} 1776 1777test_pmtu_vti4_default_mtu() { 1778 setup namespaces veth vti4 || return $ksft_skip 1779 1780 # Check that MTU of vti device is MTU of veth minus IPv4 header length 1781 veth_mtu="$(link_get_mtu "${ns_a}" veth_a)" 1782 vti4_mtu="$(link_get_mtu "${ns_a}" vti4_a)" 1783 if [ $((veth_mtu - vti4_mtu)) -ne 20 ]; then 1784 err " vti MTU ${vti4_mtu} is not veth MTU ${veth_mtu} minus IPv4 header length" 1785 return 1 1786 fi 1787} 1788 1789test_pmtu_vti6_default_mtu() { 1790 setup namespaces veth vti6 || return $ksft_skip 1791 1792 # Check that MTU of vti device is MTU of veth minus IPv6 header length 1793 veth_mtu="$(link_get_mtu "${ns_a}" veth_a)" 1794 vti6_mtu="$(link_get_mtu "${ns_a}" vti6_a)" 1795 if [ $((veth_mtu - vti6_mtu)) -ne 40 ]; then 1796 err " vti MTU ${vti6_mtu} is not veth MTU ${veth_mtu} minus IPv6 header length" 1797 return 1 1798 fi 1799} 1800 1801test_pmtu_vti4_link_add_mtu() { 1802 setup namespaces || return $ksft_skip 1803 1804 run_cmd ${ns_a} ip link add vti4_a type vti local ${veth4_a_addr} remote ${veth4_b_addr} key 10 1805 [ $? -ne 0 ] && err " vti not supported" && return $ksft_skip 1806 run_cmd ${ns_a} ip link del vti4_a 1807 1808 fail=0 1809 1810 min=68 1811 max=$((65535 - 20)) 1812 # Check invalid values first 1813 for v in $((min - 1)) $((max + 1)); do 1814 run_cmd ${ns_a} ip link add vti4_a mtu ${v} type vti local ${veth4_a_addr} remote ${veth4_b_addr} key 10 1815 # This can fail, or MTU can be adjusted to a proper value 1816 [ $? -ne 0 ] && continue 1817 mtu="$(link_get_mtu "${ns_a}" vti4_a)" 1818 if [ ${mtu} -lt ${min} -o ${mtu} -gt ${max} ]; then 1819 err " vti tunnel created with invalid MTU ${mtu}" 1820 fail=1 1821 fi 1822 run_cmd ${ns_a} ip link del vti4_a 1823 done 1824 1825 # Now check valid values 1826 for v in ${min} 1300 ${max}; do 1827 run_cmd ${ns_a} ip link add vti4_a mtu ${v} type vti local ${veth4_a_addr} remote ${veth4_b_addr} key 10 1828 mtu="$(link_get_mtu "${ns_a}" vti4_a)" 1829 run_cmd ${ns_a} ip link del vti4_a 1830 if [ "${mtu}" != "${v}" ]; then 1831 err " vti MTU ${mtu} doesn't match configured value ${v}" 1832 fail=1 1833 fi 1834 done 1835 1836 return ${fail} 1837} 1838 1839test_pmtu_vti6_link_add_mtu() { 1840 setup namespaces || return $ksft_skip 1841 1842 run_cmd ${ns_a} ip link add vti6_a type vti6 local ${veth6_a_addr} remote ${veth6_b_addr} key 10 1843 [ $? -ne 0 ] && err " vti6 not supported" && return $ksft_skip 1844 run_cmd ${ns_a} ip link del vti6_a 1845 1846 fail=0 1847 1848 min=68 # vti6 can carry IPv4 packets too 1849 max=$((65535 - 40)) 1850 # Check invalid values first 1851 for v in $((min - 1)) $((max + 1)); do 1852 run_cmd ${ns_a} ip link add vti6_a mtu ${v} type vti6 local ${veth6_a_addr} remote ${veth6_b_addr} key 10 1853 # This can fail, or MTU can be adjusted to a proper value 1854 [ $? -ne 0 ] && continue 1855 mtu="$(link_get_mtu "${ns_a}" vti6_a)" 1856 if [ ${mtu} -lt ${min} -o ${mtu} -gt ${max} ]; then 1857 err " vti6 tunnel created with invalid MTU ${v}" 1858 fail=1 1859 fi 1860 run_cmd ${ns_a} ip link del vti6_a 1861 done 1862 1863 # Now check valid values 1864 for v in 68 1280 1300 $((65535 - 40)); do 1865 run_cmd ${ns_a} ip link add vti6_a mtu ${v} type vti6 local ${veth6_a_addr} remote ${veth6_b_addr} key 10 1866 mtu="$(link_get_mtu "${ns_a}" vti6_a)" 1867 run_cmd ${ns_a} ip link del vti6_a 1868 if [ "${mtu}" != "${v}" ]; then 1869 err " vti6 MTU ${mtu} doesn't match configured value ${v}" 1870 fail=1 1871 fi 1872 done 1873 1874 return ${fail} 1875} 1876 1877test_pmtu_vti6_link_change_mtu() { 1878 setup namespaces || return $ksft_skip 1879 1880 run_cmd ${ns_a} ip link add dummy0 mtu 1500 type dummy 1881 [ $? -ne 0 ] && err " dummy not supported" && return $ksft_skip 1882 run_cmd ${ns_a} ip link add dummy1 mtu 3000 type dummy 1883 run_cmd ${ns_a} ip link set dummy0 up 1884 run_cmd ${ns_a} ip link set dummy1 up 1885 1886 run_cmd ${ns_a} ip addr add ${dummy6_0_prefix}1/${dummy6_mask} dev dummy0 1887 run_cmd ${ns_a} ip addr add ${dummy6_1_prefix}1/${dummy6_mask} dev dummy1 1888 1889 fail=0 1890 1891 # Create vti6 interface bound to device, passing MTU, check it 1892 run_cmd ${ns_a} ip link add vti6_a mtu 1300 type vti6 remote ${dummy6_0_prefix}2 local ${dummy6_0_prefix}1 1893 mtu="$(link_get_mtu "${ns_a}" vti6_a)" 1894 if [ ${mtu} -ne 1300 ]; then 1895 err " vti6 MTU ${mtu} doesn't match configured value 1300" 1896 fail=1 1897 fi 1898 1899 # Move to another device with different MTU, without passing MTU, check 1900 # MTU is adjusted 1901 run_cmd ${ns_a} ip link set vti6_a type vti6 remote ${dummy6_1_prefix}2 local ${dummy6_1_prefix}1 1902 mtu="$(link_get_mtu "${ns_a}" vti6_a)" 1903 if [ ${mtu} -ne $((3000 - 40)) ]; then 1904 err " vti MTU ${mtu} is not dummy MTU 3000 minus IPv6 header length" 1905 fail=1 1906 fi 1907 1908 # Move it back, passing MTU, check MTU is not overridden 1909 run_cmd ${ns_a} ip link set vti6_a mtu 1280 type vti6 remote ${dummy6_0_prefix}2 local ${dummy6_0_prefix}1 1910 mtu="$(link_get_mtu "${ns_a}" vti6_a)" 1911 if [ ${mtu} -ne 1280 ]; then 1912 err " vti6 MTU ${mtu} doesn't match configured value 1280" 1913 fail=1 1914 fi 1915 1916 return ${fail} 1917} 1918 1919check_command() { 1920 cmd=${1} 1921 1922 if ! which ${cmd} > /dev/null 2>&1; then 1923 err " missing required command: '${cmd}'" 1924 return 1 1925 fi 1926 return 0 1927} 1928 1929test_cleanup_vxlanX_exception() { 1930 outer="${1}" 1931 encap="vxlan" 1932 ll_mtu=4000 1933 1934 check_command taskset || return $ksft_skip 1935 cpu_list=$(grep -m 2 processor /proc/cpuinfo | cut -d ' ' -f 2) 1936 1937 setup namespaces routing ${encap}${outer} || return $ksft_skip 1938 trace "${ns_a}" ${encap}_a "${ns_b}" ${encap}_b \ 1939 "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \ 1940 "${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B 1941 1942 # Create route exception by exceeding link layer MTU 1943 mtu "${ns_a}" veth_A-R1 $((${ll_mtu} + 1000)) 1944 mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000)) 1945 mtu "${ns_b}" veth_B-R1 ${ll_mtu} 1946 mtu "${ns_r1}" veth_R1-B ${ll_mtu} 1947 1948 mtu "${ns_a}" ${encap}_a $((${ll_mtu} + 1000)) 1949 mtu "${ns_b}" ${encap}_b $((${ll_mtu} + 1000)) 1950 1951 # Fill exception cache for multiple CPUs (2) 1952 # we can always use inner IPv4 for that 1953 for cpu in ${cpu_list}; do 1954 run_cmd taskset --cpu-list ${cpu} ${ns_a} ping -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${tunnel4_b_addr} 1955 done 1956 1957 ${ns_a} ip link del dev veth_A-R1 & 1958 iplink_pid=$! 1959 sleep 1 1960 if [ "$(cat /proc/${iplink_pid}/cmdline 2>/dev/null | tr -d '\0')" = "iplinkdeldevveth_A-R1" ]; then 1961 err " can't delete veth device in a timely manner, PMTU dst likely leaked" 1962 return 1 1963 fi 1964} 1965 1966test_cleanup_ipv6_exception() { 1967 test_cleanup_vxlanX_exception 6 1968} 1969 1970test_cleanup_ipv4_exception() { 1971 test_cleanup_vxlanX_exception 4 1972} 1973 1974run_test() { 1975 ( 1976 tname="$1" 1977 tdesc="$2" 1978 1979 unset IFS 1980 1981 # Since cleanup() relies on variables modified by this subshell, it 1982 # has to run in this context. 1983 trap cleanup EXIT 1984 1985 if [ "$VERBOSE" = "1" ]; then 1986 printf "\n##########################################################################\n\n" 1987 fi 1988 1989 eval test_${tname} 1990 ret=$? 1991 1992 if [ $ret -eq 0 ]; then 1993 printf "TEST: %-60s [ OK ]\n" "${tdesc}" 1994 elif [ $ret -eq 1 ]; then 1995 printf "TEST: %-60s [FAIL]\n" "${tdesc}" 1996 if [ "${PAUSE_ON_FAIL}" = "yes" ]; then 1997 echo 1998 echo "Pausing. Hit enter to continue" 1999 read a 2000 fi 2001 err_flush 2002 exit 1 2003 elif [ $ret -eq $ksft_skip ]; then 2004 printf "TEST: %-60s [SKIP]\n" "${tdesc}" 2005 err_flush 2006 fi 2007 2008 return $ret 2009 ) 2010 ret=$? 2011 case $ret in 2012 0) 2013 all_skipped=false 2014 [ $exitcode=$ksft_skip ] && exitcode=0 2015 ;; 2016 $ksft_skip) 2017 [ $all_skipped = true ] && exitcode=$ksft_skip 2018 ;; 2019 *) 2020 all_skipped=false 2021 exitcode=1 2022 ;; 2023 esac 2024 2025 return $ret 2026} 2027 2028run_test_nh() { 2029 tname="$1" 2030 tdesc="$2" 2031 2032 USE_NH=yes 2033 run_test "${tname}" "${tdesc} - nexthop objects" 2034 USE_NH=no 2035} 2036 2037test_list_flush_ipv4_exception() { 2038 setup namespaces routing || return $ksft_skip 2039 trace "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \ 2040 "${ns_r1}" veth_R1-B "${ns_b}" veth_B-R1 \ 2041 "${ns_a}" veth_A-R2 "${ns_r2}" veth_R2-A \ 2042 "${ns_r2}" veth_R2-B "${ns_b}" veth_B-R2 2043 2044 dst_prefix1="${prefix4}.${b_r1}." 2045 dst2="${prefix4}.${b_r2}.1" 2046 2047 # Set up initial MTU values 2048 mtu "${ns_a}" veth_A-R1 2000 2049 mtu "${ns_r1}" veth_R1-A 2000 2050 mtu "${ns_r1}" veth_R1-B 1500 2051 mtu "${ns_b}" veth_B-R1 1500 2052 2053 mtu "${ns_a}" veth_A-R2 2000 2054 mtu "${ns_r2}" veth_R2-A 2000 2055 mtu "${ns_r2}" veth_R2-B 1500 2056 mtu "${ns_b}" veth_B-R2 1500 2057 2058 fail=0 2059 2060 # Add 100 addresses for veth endpoint on B reached by default A route 2061 for i in $(seq 100 199); do 2062 run_cmd ${ns_b} ip addr add "${dst_prefix1}${i}" dev veth_B-R1 2063 done 2064 2065 # Create 100 cached route exceptions for path via R1, one via R2. Note 2066 # that with IPv4 we need to actually cause a route lookup that matches 2067 # the exception caused by ICMP, in order to actually have a cached 2068 # route, so we need to ping each destination twice 2069 for i in $(seq 100 199); do 2070 run_cmd ${ns_a} ping -q -M want -i 0.1 -c 2 -s 1800 "${dst_prefix1}${i}" 2071 done 2072 run_cmd ${ns_a} ping -q -M want -i 0.1 -c 2 -s 1800 "${dst2}" 2073 2074 if [ "$(${ns_a} ip -oneline route list cache | wc -l)" -ne 101 ]; then 2075 err " can't list cached exceptions" 2076 fail=1 2077 fi 2078 2079 run_cmd ${ns_a} ip route flush cache 2080 pmtu1="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst_prefix}1)" 2081 pmtu2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst_prefix}2)" 2082 if [ -n "${pmtu1}" ] || [ -n "${pmtu2}" ] || \ 2083 [ -n "$(${ns_a} ip route list cache)" ]; then 2084 err " can't flush cached exceptions" 2085 fail=1 2086 fi 2087 2088 return ${fail} 2089} 2090 2091test_list_flush_ipv6_exception() { 2092 setup namespaces routing || return $ksft_skip 2093 trace "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \ 2094 "${ns_r1}" veth_R1-B "${ns_b}" veth_B-R1 \ 2095 "${ns_a}" veth_A-R2 "${ns_r2}" veth_R2-A \ 2096 "${ns_r2}" veth_R2-B "${ns_b}" veth_B-R2 2097 2098 dst_prefix1="${prefix6}:${b_r1}::" 2099 dst2="${prefix6}:${b_r2}::1" 2100 2101 # Set up initial MTU values 2102 mtu "${ns_a}" veth_A-R1 2000 2103 mtu "${ns_r1}" veth_R1-A 2000 2104 mtu "${ns_r1}" veth_R1-B 1500 2105 mtu "${ns_b}" veth_B-R1 1500 2106 2107 mtu "${ns_a}" veth_A-R2 2000 2108 mtu "${ns_r2}" veth_R2-A 2000 2109 mtu "${ns_r2}" veth_R2-B 1500 2110 mtu "${ns_b}" veth_B-R2 1500 2111 2112 fail=0 2113 2114 # Add 100 addresses for veth endpoint on B reached by default A route 2115 for i in $(seq 100 199); do 2116 run_cmd ${ns_b} ip addr add "${dst_prefix1}${i}" dev veth_B-R1 2117 done 2118 2119 # Create 100 cached route exceptions for path via R1, one via R2 2120 for i in $(seq 100 199); do 2121 run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s 1800 "${dst_prefix1}${i}" 2122 done 2123 run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s 1800 "${dst2}" 2124 if [ "$(${ns_a} ip -oneline -6 route list cache | wc -l)" -ne 101 ]; then 2125 err " can't list cached exceptions" 2126 fail=1 2127 fi 2128 2129 run_cmd ${ns_a} ip -6 route flush cache 2130 pmtu1="$(route_get_dst_pmtu_from_exception "${ns_a}" "${dst_prefix1}100")" 2131 pmtu2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})" 2132 if [ -n "${pmtu1}" ] || [ -n "${pmtu2}" ] || \ 2133 [ -n "$(${ns_a} ip -6 route list cache)" ]; then 2134 err " can't flush cached exceptions" 2135 fail=1 2136 fi 2137 2138 return ${fail} 2139} 2140 2141test_pmtu_ipvX_route_change() { 2142 family=${1} 2143 2144 setup namespaces routing || return 2 2145 trace "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \ 2146 "${ns_r1}" veth_R1-B "${ns_b}" veth_B-R1 \ 2147 "${ns_a}" veth_A-R2 "${ns_r2}" veth_R2-A \ 2148 "${ns_r2}" veth_R2-B "${ns_b}" veth_B-R2 2149 2150 if [ ${family} -eq 4 ]; then 2151 ping=ping 2152 dst1="${prefix4}.${b_r1}.1" 2153 dst2="${prefix4}.${b_r2}.1" 2154 gw="${prefix4}.${a_r1}.2" 2155 else 2156 ping=${ping6} 2157 dst1="${prefix6}:${b_r1}::1" 2158 dst2="${prefix6}:${b_r2}::1" 2159 gw="${prefix6}:${a_r1}::2" 2160 fi 2161 2162 # Set up initial MTU values 2163 mtu "${ns_a}" veth_A-R1 2000 2164 mtu "${ns_r1}" veth_R1-A 2000 2165 mtu "${ns_r1}" veth_R1-B 1400 2166 mtu "${ns_b}" veth_B-R1 1400 2167 2168 mtu "${ns_a}" veth_A-R2 2000 2169 mtu "${ns_r2}" veth_R2-A 2000 2170 mtu "${ns_r2}" veth_R2-B 1500 2171 mtu "${ns_b}" veth_B-R2 1500 2172 2173 # Create route exceptions 2174 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1800 ${dst1} 2175 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1800 ${dst2} 2176 2177 # Check that exceptions have been created with the correct PMTU 2178 pmtu_1="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst1})" 2179 check_pmtu_value "1400" "${pmtu_1}" "exceeding MTU" || return 1 2180 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})" 2181 check_pmtu_value "1500" "${pmtu_2}" "exceeding MTU" || return 1 2182 2183 # Replace the route from A to R1 2184 run_cmd ${ns_a} ip route change default via ${gw} 2185 2186 # Delete the device in A 2187 run_cmd ${ns_a} ip link del "veth_A-R1" 2188} 2189 2190test_pmtu_ipv4_route_change() { 2191 test_pmtu_ipvX_route_change 4 2192} 2193 2194test_pmtu_ipv6_route_change() { 2195 test_pmtu_ipvX_route_change 6 2196} 2197 2198usage() { 2199 echo 2200 echo "$0 [OPTIONS] [TEST]..." 2201 echo "If no TEST argument is given, all tests will be run." 2202 echo 2203 echo "Options" 2204 echo " --trace: capture traffic to TEST_INTERFACE.pcap" 2205 echo 2206 echo "Available tests${tests}" 2207 exit 1 2208} 2209 2210################################################################################ 2211# 2212exitcode=0 2213desc=0 2214all_skipped=true 2215 2216while getopts :ptv o 2217do 2218 case $o in 2219 p) PAUSE_ON_FAIL=yes;; 2220 v) VERBOSE=1;; 2221 t) if which tcpdump > /dev/null 2>&1; then 2222 TRACING=1 2223 else 2224 echo "=== tcpdump not available, tracing disabled" 2225 fi 2226 ;; 2227 *) usage;; 2228 esac 2229done 2230shift $(($OPTIND-1)) 2231 2232IFS=" 2233" 2234 2235for arg do 2236 # Check first that all requested tests are available before running any 2237 command -v > /dev/null "test_${arg}" || { echo "=== Test ${arg} not found"; usage; } 2238done 2239 2240trap cleanup EXIT 2241 2242# start clean 2243cleanup 2244 2245HAVE_NH=no 2246ip nexthop ls >/dev/null 2>&1 2247[ $? -eq 0 ] && HAVE_NH=yes 2248 2249name="" 2250desc="" 2251rerun_nh=0 2252for t in ${tests}; do 2253 [ "${name}" = "" ] && name="${t}" && continue 2254 [ "${desc}" = "" ] && desc="${t}" && continue 2255 2256 if [ "${HAVE_NH}" = "yes" ]; then 2257 rerun_nh="${t}" 2258 fi 2259 2260 run_this=1 2261 for arg do 2262 [ "${arg}" != "${arg#--*}" ] && continue 2263 [ "${arg}" = "${name}" ] && run_this=1 && break 2264 run_this=0 2265 done 2266 if [ $run_this -eq 1 ]; then 2267 run_test "${name}" "${desc}" 2268 # if test was skipped no need to retry with nexthop objects 2269 [ $? -eq $ksft_skip ] && rerun_nh=0 2270 2271 if [ "${rerun_nh}" = "1" ]; then 2272 run_test_nh "${name}" "${desc}" 2273 fi 2274 fi 2275 name="" 2276 desc="" 2277 rerun_nh=0 2278done 2279 2280exit ${exitcode} 2281