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 ${veth_b_addr} proto esp mode tunnel 686} 687 688setup_nettest_xfrm() { 689 if ! which nettest >/dev/null; then 690 PATH=$PWD:$PATH 691 if ! which nettest >/dev/null; then 692 echo "'nettest' command not found; skipping tests" 693 return 1 694 fi 695 fi 696 697 [ ${1} -eq 6 ] && proto="-6" || proto="" 698 port=${2} 699 700 run_cmd_bg "${ns_a}" nettest "${proto}" -q -D -s -x -p "${port}" -t 5 701 nettest_pids="${nettest_pids} $!" 702 703 run_cmd_bg "${ns_b}" nettest "${proto}" -q -D -s -x -p "${port}" -t 5 704 nettest_pids="${nettest_pids} $!" 705} 706 707setup_xfrm4() { 708 setup_xfrm 4 ${veth4_a_addr} ${veth4_b_addr} 709} 710 711setup_xfrm6() { 712 setup_xfrm 6 ${veth6_a_addr} ${veth6_b_addr} 713} 714 715setup_xfrm4udp() { 716 setup_xfrm 4 ${veth4_a_addr} ${veth4_b_addr} "encap espinudp 4500 4500 0.0.0.0" 717 setup_nettest_xfrm 4 4500 718} 719 720setup_xfrm6udp() { 721 setup_xfrm 6 ${veth6_a_addr} ${veth6_b_addr} "encap espinudp 4500 4500 0.0.0.0" 722 setup_nettest_xfrm 6 4500 723} 724 725setup_xfrm4udprouted() { 726 setup_xfrm 4 ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1 "encap espinudp 4500 4500 0.0.0.0" 727 setup_nettest_xfrm 4 4500 728} 729 730setup_xfrm6udprouted() { 731 setup_xfrm 6 ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 "encap espinudp 4500 4500 0.0.0.0" 732 setup_nettest_xfrm 6 4500 733} 734 735setup_routing_old() { 736 for i in ${routes}; do 737 [ "${ns}" = "" ] && ns="${i}" && continue 738 [ "${addr}" = "" ] && addr="${i}" && continue 739 [ "${gw}" = "" ] && gw="${i}" 740 741 ns_name="$(nsname ${ns})" 742 743 ip -n "${ns_name}" route add "${addr}" table "${rt_table}" via "${gw}" 744 745 ns=""; addr=""; gw="" 746 done 747} 748 749setup_routing_new() { 750 for i in ${nexthops}; do 751 [ "${ns}" = "" ] && ns="${i}" && continue 752 [ "${fam}" = "" ] && fam="${i}" && continue 753 [ "${nhid}" = "" ] && nhid="${i}" && continue 754 [ "${gw}" = "" ] && gw="${i}" && continue 755 [ "${dev}" = "" ] && dev="${i}" 756 757 ns_name="$(nsname ${ns})" 758 759 ip -n ${ns_name} -${fam} nexthop add id ${nhid} via ${gw} dev ${dev} 760 761 ns=""; fam=""; nhid=""; gw=""; dev="" 762 763 done 764 765 for i in ${routes_nh}; do 766 [ "${ns}" = "" ] && ns="${i}" && continue 767 [ "${fam}" = "" ] && fam="${i}" && continue 768 [ "${addr}" = "" ] && addr="${i}" && continue 769 [ "${nhid}" = "" ] && nhid="${i}" 770 771 ns_name="$(nsname ${ns})" 772 773 ip -n "${ns_name}" -"${fam}" route add "${addr}" table "${rt_table}" nhid "${nhid}" 774 775 ns=""; fam=""; addr=""; nhid="" 776 done 777} 778 779setup_routing() { 780 for i in ${NS_R1} ${NS_R2}; do 781 ip netns exec ${i} sysctl -q net/ipv4/ip_forward=1 782 ip netns exec ${i} sysctl -q net/ipv6/conf/all/forwarding=1 783 done 784 785 for i in ${routing_addrs}; do 786 [ "${ns}" = "" ] && ns="${i}" && continue 787 [ "${peer}" = "" ] && peer="${i}" && continue 788 [ "${segment}" = "" ] && segment="${i}" 789 790 ns_name="$(nsname ${ns})" 791 peer_name="$(nsname ${peer})" 792 if="veth_${ns}-${peer}" 793 ifpeer="veth_${peer}-${ns}" 794 795 # Create veth links 796 ip link add ${if} up netns ${ns_name} type veth peer name ${ifpeer} netns ${peer_name} || return 1 797 ip -n ${peer_name} link set dev ${ifpeer} up 798 799 # Add addresses 800 ip -n ${ns_name} addr add ${prefix4}.${segment}.1/24 dev ${if} 801 ip -n ${ns_name} addr add ${prefix6}:${segment}::1/64 dev ${if} 802 803 ip -n ${peer_name} addr add ${prefix4}.${segment}.2/24 dev ${ifpeer} 804 ip -n ${peer_name} addr add ${prefix6}:${segment}::2/64 dev ${ifpeer} 805 806 ns=""; peer=""; segment="" 807 done 808 809 if [ "$USE_NH" = "yes" ]; then 810 setup_routing_new 811 else 812 setup_routing_old 813 fi 814 815 return 0 816} 817 818setup_policy_routing() { 819 setup_routing 820 821 ip -netns "${NS_A}" -4 rule add dsfield "${policy_mark}" \ 822 table "${rt_table}" 823 824 # Set the IPv4 Don't Fragment bit with tc, since socat doesn't seem to 825 # have an option do to it. 826 tc -netns "${NS_A}" qdisc replace dev veth_A-R1 root prio 827 tc -netns "${NS_A}" qdisc replace dev veth_A-R2 root prio 828 tc -netns "${NS_A}" filter add dev veth_A-R1 \ 829 protocol ipv4 flower ip_proto udp \ 830 action pedit ex munge ip df set 0x40 pipe csum ip and udp 831 tc -netns "${NS_A}" filter add dev veth_A-R2 \ 832 protocol ipv4 flower ip_proto udp \ 833 action pedit ex munge ip df set 0x40 pipe csum ip and udp 834} 835 836setup_bridge() { 837 run_cmd ${ns_a} ip link add br0 type bridge || return $ksft_skip 838 run_cmd ${ns_a} ip link set br0 up 839 840 run_cmd ${ns_c} ip link add veth_C-A type veth peer name veth_A-C 841 run_cmd ${ns_c} ip link set veth_A-C netns ns-A 842 843 run_cmd ${ns_a} ip link set veth_A-C up 844 run_cmd ${ns_c} ip link set veth_C-A up 845 run_cmd ${ns_c} ip addr add ${veth4_c_addr}/${veth4_mask} dev veth_C-A 846 run_cmd ${ns_c} ip addr add ${veth6_c_addr}/${veth6_mask} dev veth_C-A 847 run_cmd ${ns_a} ip link set veth_A-C master br0 848} 849 850setup_ovs_vxlan_or_geneve() { 851 type="${1}" 852 a_addr="${2}" 853 b_addr="${3}" 854 855 if [ "${type}" = "vxlan" ]; then 856 opts="${opts} ttl 64 dstport 4789" 857 opts_b="local ${b_addr}" 858 fi 859 860 run_cmd ovs-vsctl add-port ovs_br0 ${type}_a -- \ 861 set interface ${type}_a type=${type} \ 862 options:remote_ip=${b_addr} options:key=1 options:csum=true || return 1 863 864 run_cmd ${ns_b} ip link add ${type}_b type ${type} id 1 ${opts_b} remote ${a_addr} ${opts} || return 1 865 866 run_cmd ${ns_b} ip addr add ${tunnel4_b_addr}/${tunnel4_mask} dev ${type}_b 867 run_cmd ${ns_b} ip addr add ${tunnel6_b_addr}/${tunnel6_mask} dev ${type}_b 868 869 run_cmd ${ns_b} ip link set ${type}_b up 870} 871 872setup_ovs_geneve4() { 873 setup_ovs_vxlan_or_geneve geneve ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1 874} 875 876setup_ovs_vxlan4() { 877 setup_ovs_vxlan_or_geneve vxlan ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1 878} 879 880setup_ovs_geneve6() { 881 setup_ovs_vxlan_or_geneve geneve ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 882} 883 884setup_ovs_vxlan6() { 885 setup_ovs_vxlan_or_geneve vxlan ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 886} 887 888setup_ovs_bridge() { 889 run_cmd ovs-vsctl add-br ovs_br0 || return $ksft_skip 890 run_cmd ip link set ovs_br0 up 891 892 run_cmd ${ns_c} ip link add veth_C-A type veth peer name veth_A-C 893 run_cmd ${ns_c} ip link set veth_A-C netns 1 894 895 run_cmd ip link set veth_A-C up 896 run_cmd ${ns_c} ip link set veth_C-A up 897 run_cmd ${ns_c} ip addr add ${veth4_c_addr}/${veth4_mask} dev veth_C-A 898 run_cmd ${ns_c} ip addr add ${veth6_c_addr}/${veth6_mask} dev veth_C-A 899 run_cmd ovs-vsctl add-port ovs_br0 veth_A-C 900 901 # Move veth_A-R1 to init 902 run_cmd ${ns_a} ip link set veth_A-R1 netns 1 903 run_cmd ip addr add ${prefix4}.${a_r1}.1/${veth4_mask} dev veth_A-R1 904 run_cmd ip addr add ${prefix6}:${a_r1}::1/${veth6_mask} dev veth_A-R1 905 run_cmd ip link set veth_A-R1 up 906 run_cmd ip route add ${prefix4}.${b_r1}.1 via ${prefix4}.${a_r1}.2 907 run_cmd ip route add ${prefix6}:${b_r1}::1 via ${prefix6}:${a_r1}::2 908} 909 910setup() { 911 [ "$(id -u)" -ne 0 ] && echo " need to run as root" && return $ksft_skip 912 913 for arg do 914 eval setup_${arg} || { echo " ${arg} not supported"; return 1; } 915 done 916} 917 918trace() { 919 [ $TRACING -eq 0 ] && return 920 921 for arg do 922 [ "${ns_cmd}" = "" ] && ns_cmd="${arg}" && continue 923 ${ns_cmd} tcpdump --immediate-mode -s 0 -i "${arg}" -w "${name}_${arg}.pcap" 2> /dev/null & 924 tcpdump_pids="${tcpdump_pids} $!" 925 ns_cmd= 926 done 927 sleep 1 928} 929 930cleanup() { 931 for pid in ${tcpdump_pids}; do 932 kill ${pid} 933 done 934 tcpdump_pids= 935 936 for pid in ${nettest_pids}; do 937 kill ${pid} 938 done 939 nettest_pids= 940 941 for pid in ${socat_pids}; do 942 kill "${pid}" 943 done 944 socat_pids= 945 946 for n in ${NS_A} ${NS_B} ${NS_C} ${NS_R1} ${NS_R2}; do 947 ip netns del ${n} 2> /dev/null 948 done 949 950 ip link del veth_A-C 2>/dev/null 951 ip link del veth_A-R1 2>/dev/null 952 ovs-vsctl --if-exists del-port vxlan_a 2>/dev/null 953 ovs-vsctl --if-exists del-br ovs_br0 2>/dev/null 954} 955 956mtu() { 957 ns_cmd="${1}" 958 dev="${2}" 959 mtu="${3}" 960 961 ${ns_cmd} ip link set dev ${dev} mtu ${mtu} 962} 963 964mtu_parse() { 965 input="${1}" 966 967 next=0 968 for i in ${input}; do 969 [ ${next} -eq 1 -a "${i}" = "lock" ] && next=2 && continue 970 [ ${next} -eq 1 ] && echo "${i}" && return 971 [ ${next} -eq 2 ] && echo "lock ${i}" && return 972 [ "${i}" = "mtu" ] && next=1 973 done 974} 975 976link_get() { 977 ns_cmd="${1}" 978 name="${2}" 979 980 ${ns_cmd} ip link show dev "${name}" 981} 982 983link_get_mtu() { 984 ns_cmd="${1}" 985 name="${2}" 986 987 mtu_parse "$(link_get "${ns_cmd}" ${name})" 988} 989 990route_get_dst_exception() { 991 ns_cmd="${1}" 992 dst="${2}" 993 dsfield="${3}" 994 995 if [ -z "${dsfield}" ]; then 996 dsfield=0 997 fi 998 999 ${ns_cmd} ip route get "${dst}" dsfield "${dsfield}" 1000} 1001 1002route_get_dst_pmtu_from_exception() { 1003 ns_cmd="${1}" 1004 dst="${2}" 1005 dsfield="${3}" 1006 1007 mtu_parse "$(route_get_dst_exception "${ns_cmd}" "${dst}" "${dsfield}")" 1008} 1009 1010check_pmtu_value() { 1011 expected="${1}" 1012 value="${2}" 1013 event="${3}" 1014 1015 [ "${expected}" = "any" ] && [ -n "${value}" ] && return 0 1016 [ "${value}" = "${expected}" ] && return 0 1017 [ -z "${value}" ] && err " PMTU exception wasn't created after ${event}" && return 1 1018 [ -z "${expected}" ] && err " PMTU exception shouldn't exist after ${event}" && return 1 1019 err " found PMTU exception with incorrect MTU ${value}, expected ${expected}, after ${event}" 1020 return 1 1021} 1022 1023test_pmtu_ipvX() { 1024 family=${1} 1025 1026 setup namespaces routing || return $ksft_skip 1027 trace "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \ 1028 "${ns_r1}" veth_R1-B "${ns_b}" veth_B-R1 \ 1029 "${ns_a}" veth_A-R2 "${ns_r2}" veth_R2-A \ 1030 "${ns_r2}" veth_R2-B "${ns_b}" veth_B-R2 1031 1032 if [ ${family} -eq 4 ]; then 1033 ping=ping 1034 dst1="${prefix4}.${b_r1}.1" 1035 dst2="${prefix4}.${b_r2}.1" 1036 else 1037 ping=${ping6} 1038 dst1="${prefix6}:${b_r1}::1" 1039 dst2="${prefix6}:${b_r2}::1" 1040 fi 1041 1042 # Set up initial MTU values 1043 mtu "${ns_a}" veth_A-R1 2000 1044 mtu "${ns_r1}" veth_R1-A 2000 1045 mtu "${ns_r1}" veth_R1-B 1400 1046 mtu "${ns_b}" veth_B-R1 1400 1047 1048 mtu "${ns_a}" veth_A-R2 2000 1049 mtu "${ns_r2}" veth_R2-A 2000 1050 mtu "${ns_r2}" veth_R2-B 1500 1051 mtu "${ns_b}" veth_B-R2 1500 1052 1053 # Create route exceptions 1054 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1800 ${dst1} 1055 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1800 ${dst2} 1056 1057 # Check that exceptions have been created with the correct PMTU 1058 pmtu_1="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst1})" 1059 check_pmtu_value "1400" "${pmtu_1}" "exceeding MTU" || return 1 1060 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})" 1061 check_pmtu_value "1500" "${pmtu_2}" "exceeding MTU" || return 1 1062 1063 # Decrease local MTU below PMTU, check for PMTU decrease in route exception 1064 mtu "${ns_a}" veth_A-R1 1300 1065 mtu "${ns_r1}" veth_R1-A 1300 1066 pmtu_1="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst1})" 1067 check_pmtu_value "1300" "${pmtu_1}" "decreasing local MTU" || return 1 1068 # Second exception shouldn't be modified 1069 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})" 1070 check_pmtu_value "1500" "${pmtu_2}" "changing local MTU on a link not on this path" || return 1 1071 1072 # Increase MTU, check for PMTU increase in route exception 1073 mtu "${ns_a}" veth_A-R1 1700 1074 mtu "${ns_r1}" veth_R1-A 1700 1075 pmtu_1="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst1})" 1076 check_pmtu_value "1700" "${pmtu_1}" "increasing local MTU" || return 1 1077 # Second exception shouldn't be modified 1078 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})" 1079 check_pmtu_value "1500" "${pmtu_2}" "changing local MTU on a link not on this path" || return 1 1080 1081 # Skip PMTU locking tests for IPv6 1082 [ $family -eq 6 ] && return 0 1083 1084 # Decrease remote MTU on path via R2, get new exception 1085 mtu "${ns_r2}" veth_R2-B 400 1086 mtu "${ns_b}" veth_B-R2 400 1087 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1400 ${dst2} 1088 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})" 1089 check_pmtu_value "lock 552" "${pmtu_2}" "exceeding MTU, with MTU < min_pmtu" || return 1 1090 1091 # Decrease local MTU below PMTU 1092 mtu "${ns_a}" veth_A-R2 500 1093 mtu "${ns_r2}" veth_R2-A 500 1094 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})" 1095 check_pmtu_value "500" "${pmtu_2}" "decreasing local MTU" || return 1 1096 1097 # Increase local MTU 1098 mtu "${ns_a}" veth_A-R2 1500 1099 mtu "${ns_r2}" veth_R2-A 1500 1100 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})" 1101 check_pmtu_value "1500" "${pmtu_2}" "increasing local MTU" || return 1 1102 1103 # Get new exception 1104 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1400 ${dst2} 1105 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})" 1106 check_pmtu_value "lock 552" "${pmtu_2}" "exceeding MTU, with MTU < min_pmtu" || return 1 1107} 1108 1109test_pmtu_ipv4_exception() { 1110 test_pmtu_ipvX 4 1111} 1112 1113test_pmtu_ipv6_exception() { 1114 test_pmtu_ipvX 6 1115} 1116 1117test_pmtu_ipv4_dscp_icmp_exception() { 1118 rt_table=100 1119 1120 setup namespaces policy_routing || return $ksft_skip 1121 trace "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \ 1122 "${ns_r1}" veth_R1-B "${ns_b}" veth_B-R1 \ 1123 "${ns_a}" veth_A-R2 "${ns_r2}" veth_R2-A \ 1124 "${ns_r2}" veth_R2-B "${ns_b}" veth_B-R2 1125 1126 # Set up initial MTU values 1127 mtu "${ns_a}" veth_A-R1 2000 1128 mtu "${ns_r1}" veth_R1-A 2000 1129 mtu "${ns_r1}" veth_R1-B 1400 1130 mtu "${ns_b}" veth_B-R1 1400 1131 1132 mtu "${ns_a}" veth_A-R2 2000 1133 mtu "${ns_r2}" veth_R2-A 2000 1134 mtu "${ns_r2}" veth_R2-B 1500 1135 mtu "${ns_b}" veth_B-R2 1500 1136 1137 len=$((2000 - 20 - 8)) # Fills MTU of veth_A-R1 1138 1139 dst1="${prefix4}.${b_r1}.1" 1140 dst2="${prefix4}.${b_r2}.1" 1141 1142 # Create route exceptions 1143 dsfield=${policy_mark} # No ECN bit set (Not-ECT) 1144 run_cmd "${ns_a}" ping -q -M want -Q "${dsfield}" -c 1 -w 1 -s "${len}" "${dst1}" 1145 1146 dsfield=$(printf "%#x" $((policy_mark + 0x02))) # ECN=2 (ECT(0)) 1147 run_cmd "${ns_a}" ping -q -M want -Q "${dsfield}" -c 1 -w 1 -s "${len}" "${dst2}" 1148 1149 # Check that exceptions have been created with the correct PMTU 1150 pmtu_1="$(route_get_dst_pmtu_from_exception "${ns_a}" "${dst1}" "${policy_mark}")" 1151 check_pmtu_value "1400" "${pmtu_1}" "exceeding MTU" || return 1 1152 1153 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" "${dst2}" "${policy_mark}")" 1154 check_pmtu_value "1500" "${pmtu_2}" "exceeding MTU" || return 1 1155} 1156 1157test_pmtu_ipv4_dscp_udp_exception() { 1158 rt_table=100 1159 1160 if ! which socat > /dev/null 2>&1; then 1161 echo "'socat' command not found; skipping tests" 1162 return $ksft_skip 1163 fi 1164 1165 setup namespaces policy_routing || return $ksft_skip 1166 trace "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \ 1167 "${ns_r1}" veth_R1-B "${ns_b}" veth_B-R1 \ 1168 "${ns_a}" veth_A-R2 "${ns_r2}" veth_R2-A \ 1169 "${ns_r2}" veth_R2-B "${ns_b}" veth_B-R2 1170 1171 # Set up initial MTU values 1172 mtu "${ns_a}" veth_A-R1 2000 1173 mtu "${ns_r1}" veth_R1-A 2000 1174 mtu "${ns_r1}" veth_R1-B 1400 1175 mtu "${ns_b}" veth_B-R1 1400 1176 1177 mtu "${ns_a}" veth_A-R2 2000 1178 mtu "${ns_r2}" veth_R2-A 2000 1179 mtu "${ns_r2}" veth_R2-B 1500 1180 mtu "${ns_b}" veth_B-R2 1500 1181 1182 len=$((2000 - 20 - 8)) # Fills MTU of veth_A-R1 1183 1184 dst1="${prefix4}.${b_r1}.1" 1185 dst2="${prefix4}.${b_r2}.1" 1186 1187 # Create route exceptions 1188 run_cmd_bg "${ns_b}" socat UDP-LISTEN:50000 OPEN:/dev/null,wronly=1 1189 socat_pids="${socat_pids} $!" 1190 1191 dsfield=${policy_mark} # No ECN bit set (Not-ECT) 1192 run_cmd "${ns_a}" socat OPEN:/dev/zero,rdonly=1,readbytes="${len}" \ 1193 UDP:"${dst1}":50000,tos="${dsfield}" 1194 1195 dsfield=$(printf "%#x" $((policy_mark + 0x02))) # ECN=2 (ECT(0)) 1196 run_cmd "${ns_a}" socat OPEN:/dev/zero,rdonly=1,readbytes="${len}" \ 1197 UDP:"${dst2}":50000,tos="${dsfield}" 1198 1199 # Check that exceptions have been created with the correct PMTU 1200 pmtu_1="$(route_get_dst_pmtu_from_exception "${ns_a}" "${dst1}" "${policy_mark}")" 1201 check_pmtu_value "1400" "${pmtu_1}" "exceeding MTU" || return 1 1202 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" "${dst2}" "${policy_mark}")" 1203 check_pmtu_value "1500" "${pmtu_2}" "exceeding MTU" || return 1 1204} 1205 1206test_pmtu_ipvX_over_vxlanY_or_geneveY_exception() { 1207 type=${1} 1208 family=${2} 1209 outer_family=${3} 1210 ll_mtu=4000 1211 1212 if [ ${outer_family} -eq 4 ]; then 1213 setup namespaces routing ${type}4 || return $ksft_skip 1214 # IPv4 header UDP header VXLAN/GENEVE header Ethernet header 1215 exp_mtu=$((${ll_mtu} - 20 - 8 - 8 - 14)) 1216 else 1217 setup namespaces routing ${type}6 || return $ksft_skip 1218 # IPv6 header UDP header VXLAN/GENEVE header Ethernet header 1219 exp_mtu=$((${ll_mtu} - 40 - 8 - 8 - 14)) 1220 fi 1221 1222 trace "${ns_a}" ${type}_a "${ns_b}" ${type}_b \ 1223 "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \ 1224 "${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B 1225 1226 if [ ${family} -eq 4 ]; then 1227 ping=ping 1228 dst=${tunnel4_b_addr} 1229 else 1230 ping=${ping6} 1231 dst=${tunnel6_b_addr} 1232 fi 1233 1234 # Create route exception by exceeding link layer MTU 1235 mtu "${ns_a}" veth_A-R1 $((${ll_mtu} + 1000)) 1236 mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000)) 1237 mtu "${ns_b}" veth_B-R1 ${ll_mtu} 1238 mtu "${ns_r1}" veth_R1-B ${ll_mtu} 1239 1240 mtu "${ns_a}" ${type}_a $((${ll_mtu} + 1000)) 1241 mtu "${ns_b}" ${type}_b $((${ll_mtu} + 1000)) 1242 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${dst} 1243 1244 # Check that exception was created 1245 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst})" 1246 check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on ${type} interface" 1247} 1248 1249test_pmtu_ipv4_vxlan4_exception() { 1250 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception vxlan 4 4 1251} 1252 1253test_pmtu_ipv6_vxlan4_exception() { 1254 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception vxlan 6 4 1255} 1256 1257test_pmtu_ipv4_geneve4_exception() { 1258 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception geneve 4 4 1259} 1260 1261test_pmtu_ipv6_geneve4_exception() { 1262 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception geneve 6 4 1263} 1264 1265test_pmtu_ipv4_vxlan6_exception() { 1266 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception vxlan 4 6 1267} 1268 1269test_pmtu_ipv6_vxlan6_exception() { 1270 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception vxlan 6 6 1271} 1272 1273test_pmtu_ipv4_geneve6_exception() { 1274 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception geneve 4 6 1275} 1276 1277test_pmtu_ipv6_geneve6_exception() { 1278 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception geneve 6 6 1279} 1280 1281test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception() { 1282 type=${1} 1283 family=${2} 1284 outer_family=${3} 1285 ll_mtu=4000 1286 1287 if [ ${outer_family} -eq 4 ]; then 1288 setup namespaces routing bridge bridged_${type}4 || return $ksft_skip 1289 # IPv4 header UDP header VXLAN/GENEVE header Ethernet header 1290 exp_mtu=$((${ll_mtu} - 20 - 8 - 8 - 14)) 1291 else 1292 setup namespaces routing bridge bridged_${type}6 || return $ksft_skip 1293 # IPv6 header UDP header VXLAN/GENEVE header Ethernet header 1294 exp_mtu=$((${ll_mtu} - 40 - 8 - 8 - 14)) 1295 fi 1296 1297 trace "${ns_a}" ${type}_a "${ns_b}" ${type}_b \ 1298 "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \ 1299 "${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B \ 1300 "${ns_a}" br0 "${ns_a}" veth-A-C \ 1301 "${ns_c}" veth_C-A 1302 1303 if [ ${family} -eq 4 ]; then 1304 ping=ping 1305 dst=${tunnel4_b_addr} 1306 else 1307 ping=${ping6} 1308 dst=${tunnel6_b_addr} 1309 fi 1310 1311 # Create route exception by exceeding link layer MTU 1312 mtu "${ns_a}" veth_A-R1 $((${ll_mtu} + 1000)) 1313 mtu "${ns_a}" br0 $((${ll_mtu} + 1000)) 1314 mtu "${ns_a}" veth_A-C $((${ll_mtu} + 1000)) 1315 mtu "${ns_c}" veth_C-A $((${ll_mtu} + 1000)) 1316 mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000)) 1317 mtu "${ns_b}" veth_B-R1 ${ll_mtu} 1318 mtu "${ns_r1}" veth_R1-B ${ll_mtu} 1319 1320 mtu "${ns_a}" ${type}_a $((${ll_mtu} + 1000)) 1321 mtu "${ns_b}" ${type}_b $((${ll_mtu} + 1000)) 1322 1323 run_cmd ${ns_c} ${ping} -q -M want -i 0.1 -c 10 -s $((${ll_mtu} + 500)) ${dst} || return 1 1324 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${dst} || return 1 1325 1326 # Check that exceptions were created 1327 pmtu="$(route_get_dst_pmtu_from_exception "${ns_c}" ${dst})" 1328 check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on bridged ${type} interface" 1329 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst})" 1330 check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on locally bridged ${type} interface" 1331} 1332 1333test_pmtu_ipv4_br_vxlan4_exception() { 1334 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception vxlan 4 4 1335} 1336 1337test_pmtu_ipv6_br_vxlan4_exception() { 1338 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception vxlan 6 4 1339} 1340 1341test_pmtu_ipv4_br_geneve4_exception() { 1342 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception geneve 4 4 1343} 1344 1345test_pmtu_ipv6_br_geneve4_exception() { 1346 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception geneve 6 4 1347} 1348 1349test_pmtu_ipv4_br_vxlan6_exception() { 1350 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception vxlan 4 6 1351} 1352 1353test_pmtu_ipv6_br_vxlan6_exception() { 1354 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception vxlan 6 6 1355} 1356 1357test_pmtu_ipv4_br_geneve6_exception() { 1358 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception geneve 4 6 1359} 1360 1361test_pmtu_ipv6_br_geneve6_exception() { 1362 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception geneve 6 6 1363} 1364 1365test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception() { 1366 type=${1} 1367 family=${2} 1368 outer_family=${3} 1369 ll_mtu=4000 1370 1371 if [ ${outer_family} -eq 4 ]; then 1372 setup namespaces routing ovs_bridge ovs_${type}4 || return $ksft_skip 1373 # IPv4 header UDP header VXLAN/GENEVE header Ethernet header 1374 exp_mtu=$((${ll_mtu} - 20 - 8 - 8 - 14)) 1375 else 1376 setup namespaces routing ovs_bridge ovs_${type}6 || return $ksft_skip 1377 # IPv6 header UDP header VXLAN/GENEVE header Ethernet header 1378 exp_mtu=$((${ll_mtu} - 40 - 8 - 8 - 14)) 1379 fi 1380 1381 if [ "${type}" = "vxlan" ]; then 1382 tun_a="vxlan_sys_4789" 1383 elif [ "${type}" = "geneve" ]; then 1384 tun_a="genev_sys_6081" 1385 fi 1386 1387 trace "" "${tun_a}" "${ns_b}" ${type}_b \ 1388 "" veth_A-R1 "${ns_r1}" veth_R1-A \ 1389 "${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B \ 1390 "" ovs_br0 "" veth-A-C \ 1391 "${ns_c}" veth_C-A 1392 1393 if [ ${family} -eq 4 ]; then 1394 ping=ping 1395 dst=${tunnel4_b_addr} 1396 else 1397 ping=${ping6} 1398 dst=${tunnel6_b_addr} 1399 fi 1400 1401 # Create route exception by exceeding link layer MTU 1402 mtu "" veth_A-R1 $((${ll_mtu} + 1000)) 1403 mtu "" ovs_br0 $((${ll_mtu} + 1000)) 1404 mtu "" veth_A-C $((${ll_mtu} + 1000)) 1405 mtu "${ns_c}" veth_C-A $((${ll_mtu} + 1000)) 1406 mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000)) 1407 mtu "${ns_b}" veth_B-R1 ${ll_mtu} 1408 mtu "${ns_r1}" veth_R1-B ${ll_mtu} 1409 1410 mtu "" ${tun_a} $((${ll_mtu} + 1000)) 1411 mtu "${ns_b}" ${type}_b $((${ll_mtu} + 1000)) 1412 1413 run_cmd ${ns_c} ${ping} -q -M want -i 0.1 -c 20 -s $((${ll_mtu} + 500)) ${dst} || return 1 1414 1415 # Check that exceptions were created 1416 pmtu="$(route_get_dst_pmtu_from_exception "${ns_c}" ${dst})" 1417 check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on Open vSwitch ${type} interface" 1418} 1419 1420test_pmtu_ipv4_ovs_vxlan4_exception() { 1421 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception vxlan 4 4 1422} 1423 1424test_pmtu_ipv6_ovs_vxlan4_exception() { 1425 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception vxlan 6 4 1426} 1427 1428test_pmtu_ipv4_ovs_geneve4_exception() { 1429 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception geneve 4 4 1430} 1431 1432test_pmtu_ipv6_ovs_geneve4_exception() { 1433 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception geneve 6 4 1434} 1435 1436test_pmtu_ipv4_ovs_vxlan6_exception() { 1437 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception vxlan 4 6 1438} 1439 1440test_pmtu_ipv6_ovs_vxlan6_exception() { 1441 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception vxlan 6 6 1442} 1443 1444test_pmtu_ipv4_ovs_geneve6_exception() { 1445 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception geneve 4 6 1446} 1447 1448test_pmtu_ipv6_ovs_geneve6_exception() { 1449 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception geneve 6 6 1450} 1451 1452test_pmtu_ipvX_over_fouY_or_gueY() { 1453 inner_family=${1} 1454 outer_family=${2} 1455 encap=${3} 1456 ll_mtu=4000 1457 1458 setup namespaces routing ${encap}${outer_family}${inner_family} || return $ksft_skip 1459 trace "${ns_a}" ${encap}_a "${ns_b}" ${encap}_b \ 1460 "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \ 1461 "${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B 1462 1463 if [ ${inner_family} -eq 4 ]; then 1464 ping=ping 1465 dst=${tunnel4_b_addr} 1466 else 1467 ping=${ping6} 1468 dst=${tunnel6_b_addr} 1469 fi 1470 1471 if [ "${encap}" = "gue" ]; then 1472 encap_overhead=4 1473 else 1474 encap_overhead=0 1475 fi 1476 1477 if [ ${outer_family} -eq 4 ]; then 1478 # IPv4 header UDP header 1479 exp_mtu=$((${ll_mtu} - 20 - 8 - ${encap_overhead})) 1480 else 1481 # IPv6 header Option 4 UDP header 1482 exp_mtu=$((${ll_mtu} - 40 - 8 - 8 - ${encap_overhead})) 1483 fi 1484 1485 # Create route exception by exceeding link layer MTU 1486 mtu "${ns_a}" veth_A-R1 $((${ll_mtu} + 1000)) 1487 mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000)) 1488 mtu "${ns_b}" veth_B-R1 ${ll_mtu} 1489 mtu "${ns_r1}" veth_R1-B ${ll_mtu} 1490 1491 mtu "${ns_a}" ${encap}_a $((${ll_mtu} + 1000)) 1492 mtu "${ns_b}" ${encap}_b $((${ll_mtu} + 1000)) 1493 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${dst} 1494 1495 # Check that exception was created 1496 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst})" 1497 check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on ${encap} interface" 1498} 1499 1500test_pmtu_ipv4_fou4_exception() { 1501 test_pmtu_ipvX_over_fouY_or_gueY 4 4 fou 1502} 1503 1504test_pmtu_ipv6_fou4_exception() { 1505 test_pmtu_ipvX_over_fouY_or_gueY 6 4 fou 1506} 1507 1508test_pmtu_ipv4_fou6_exception() { 1509 test_pmtu_ipvX_over_fouY_or_gueY 4 6 fou 1510} 1511 1512test_pmtu_ipv6_fou6_exception() { 1513 test_pmtu_ipvX_over_fouY_or_gueY 6 6 fou 1514} 1515 1516test_pmtu_ipv4_gue4_exception() { 1517 test_pmtu_ipvX_over_fouY_or_gueY 4 4 gue 1518} 1519 1520test_pmtu_ipv6_gue4_exception() { 1521 test_pmtu_ipvX_over_fouY_or_gueY 6 4 gue 1522} 1523 1524test_pmtu_ipv4_gue6_exception() { 1525 test_pmtu_ipvX_over_fouY_or_gueY 4 6 gue 1526} 1527 1528test_pmtu_ipv6_gue6_exception() { 1529 test_pmtu_ipvX_over_fouY_or_gueY 6 6 gue 1530} 1531 1532test_pmtu_ipvX_over_ipvY_exception() { 1533 inner=${1} 1534 outer=${2} 1535 ll_mtu=4000 1536 1537 setup namespaces routing ip${inner}ip${outer} || return $ksft_skip 1538 1539 trace "${ns_a}" ip_a "${ns_b}" ip_b \ 1540 "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \ 1541 "${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B 1542 1543 if [ ${inner} -eq 4 ]; then 1544 ping=ping 1545 dst=${tunnel4_b_addr} 1546 else 1547 ping=${ping6} 1548 dst=${tunnel6_b_addr} 1549 fi 1550 1551 if [ ${outer} -eq 4 ]; then 1552 # IPv4 header 1553 exp_mtu=$((${ll_mtu} - 20)) 1554 else 1555 # IPv6 header Option 4 1556 exp_mtu=$((${ll_mtu} - 40 - 8)) 1557 fi 1558 1559 # Create route exception by exceeding link layer MTU 1560 mtu "${ns_a}" veth_A-R1 $((${ll_mtu} + 1000)) 1561 mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000)) 1562 mtu "${ns_b}" veth_B-R1 ${ll_mtu} 1563 mtu "${ns_r1}" veth_R1-B ${ll_mtu} 1564 1565 mtu "${ns_a}" ip_a $((${ll_mtu} + 1000)) || return 1566 mtu "${ns_b}" ip_b $((${ll_mtu} + 1000)) || return 1567 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${dst} 1568 1569 # Check that exception was created 1570 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst})" 1571 check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on ip${inner}ip${outer} interface" 1572} 1573 1574test_pmtu_ipv4_ipv4_exception() { 1575 test_pmtu_ipvX_over_ipvY_exception 4 4 1576} 1577 1578test_pmtu_ipv6_ipv4_exception() { 1579 test_pmtu_ipvX_over_ipvY_exception 6 4 1580} 1581 1582test_pmtu_ipv4_ipv6_exception() { 1583 test_pmtu_ipvX_over_ipvY_exception 4 6 1584} 1585 1586test_pmtu_ipv6_ipv6_exception() { 1587 test_pmtu_ipvX_over_ipvY_exception 6 6 1588} 1589 1590test_pmtu_vti4_exception() { 1591 setup namespaces veth vti4 xfrm4 || return $ksft_skip 1592 trace "${ns_a}" veth_a "${ns_b}" veth_b \ 1593 "${ns_a}" vti4_a "${ns_b}" vti4_b 1594 1595 veth_mtu=1500 1596 vti_mtu=$((veth_mtu - 20)) 1597 1598 # SPI SN IV ICV pad length next header 1599 esp_payload_rfc4106=$((vti_mtu - 4 - 4 - 8 - 16 - 1 - 1)) 1600 ping_payload=$((esp_payload_rfc4106 - 28)) 1601 1602 mtu "${ns_a}" veth_a ${veth_mtu} 1603 mtu "${ns_b}" veth_b ${veth_mtu} 1604 mtu "${ns_a}" vti4_a ${vti_mtu} 1605 mtu "${ns_b}" vti4_b ${vti_mtu} 1606 1607 # Send DF packet without exceeding link layer MTU, check that no 1608 # exception is created 1609 run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s ${ping_payload} ${tunnel4_b_addr} 1610 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel4_b_addr})" 1611 check_pmtu_value "" "${pmtu}" "sending packet smaller than PMTU (IP payload length ${esp_payload_rfc4106})" || return 1 1612 1613 # Now exceed link layer MTU by one byte, check that exception is created 1614 # with the right PMTU value 1615 run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s $((ping_payload + 1)) ${tunnel4_b_addr} 1616 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel4_b_addr})" 1617 check_pmtu_value "${esp_payload_rfc4106}" "${pmtu}" "exceeding PMTU (IP payload length $((esp_payload_rfc4106 + 1)))" 1618} 1619 1620test_pmtu_vti6_exception() { 1621 setup namespaces veth vti6 xfrm6 || return $ksft_skip 1622 trace "${ns_a}" veth_a "${ns_b}" veth_b \ 1623 "${ns_a}" vti6_a "${ns_b}" vti6_b 1624 fail=0 1625 1626 # Create route exception by exceeding link layer MTU 1627 mtu "${ns_a}" veth_a 4000 1628 mtu "${ns_b}" veth_b 4000 1629 mtu "${ns_a}" vti6_a 5000 1630 mtu "${ns_b}" vti6_b 5000 1631 run_cmd ${ns_a} ${ping6} -q -i 0.1 -w 1 -s 60000 ${tunnel6_b_addr} 1632 1633 # Check that exception was created 1634 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})" 1635 check_pmtu_value any "${pmtu}" "creating tunnel exceeding link layer MTU" || return 1 1636 1637 # Decrease tunnel MTU, check for PMTU decrease in route exception 1638 mtu "${ns_a}" vti6_a 3000 1639 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})" 1640 check_pmtu_value "3000" "${pmtu}" "decreasing tunnel MTU" || fail=1 1641 1642 # Increase tunnel MTU, check for PMTU increase in route exception 1643 mtu "${ns_a}" vti6_a 9000 1644 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})" 1645 check_pmtu_value "9000" "${pmtu}" "increasing tunnel MTU" || fail=1 1646 1647 return ${fail} 1648} 1649 1650test_pmtu_vti4_udp_exception() { 1651 setup namespaces veth vti4 xfrm4udp || return $ksft_skip 1652 trace "${ns_a}" veth_a "${ns_b}" veth_b \ 1653 "${ns_a}" vti4_a "${ns_b}" vti4_b 1654 1655 veth_mtu=1500 1656 vti_mtu=$((veth_mtu - 20)) 1657 1658 # UDP SPI SN IV ICV pad length next header 1659 esp_payload_rfc4106=$((vti_mtu - 8 - 4 - 4 - 8 - 16 - 1 - 1)) 1660 ping_payload=$((esp_payload_rfc4106 - 28)) 1661 1662 mtu "${ns_a}" veth_a ${veth_mtu} 1663 mtu "${ns_b}" veth_b ${veth_mtu} 1664 mtu "${ns_a}" vti4_a ${vti_mtu} 1665 mtu "${ns_b}" vti4_b ${vti_mtu} 1666 1667 # Send DF packet without exceeding link layer MTU, check that no 1668 # exception is created 1669 run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s ${ping_payload} ${tunnel4_b_addr} 1670 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel4_b_addr})" 1671 check_pmtu_value "" "${pmtu}" "sending packet smaller than PMTU (IP payload length ${esp_payload_rfc4106})" || return 1 1672 1673 # Now exceed link layer MTU by one byte, check that exception is created 1674 # with the right PMTU value 1675 run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s $((ping_payload + 1)) ${tunnel4_b_addr} 1676 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel4_b_addr})" 1677 check_pmtu_value "${esp_payload_rfc4106}" "${pmtu}" "exceeding PMTU (IP payload length $((esp_payload_rfc4106 + 1)))" 1678} 1679 1680test_pmtu_vti6_udp_exception() { 1681 setup namespaces veth vti6 xfrm6udp || return $ksft_skip 1682 trace "${ns_a}" veth_a "${ns_b}" veth_b \ 1683 "${ns_a}" vti6_a "${ns_b}" vti6_b 1684 fail=0 1685 1686 # Create route exception by exceeding link layer MTU 1687 mtu "${ns_a}" veth_a 4000 1688 mtu "${ns_b}" veth_b 4000 1689 mtu "${ns_a}" vti6_a 5000 1690 mtu "${ns_b}" vti6_b 5000 1691 run_cmd ${ns_a} ${ping6} -q -i 0.1 -w 1 -s 60000 ${tunnel6_b_addr} 1692 1693 # Check that exception was created 1694 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})" 1695 check_pmtu_value any "${pmtu}" "creating tunnel exceeding link layer MTU" || return 1 1696 1697 # Decrease tunnel MTU, check for PMTU decrease in route exception 1698 mtu "${ns_a}" vti6_a 3000 1699 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})" 1700 check_pmtu_value "3000" "${pmtu}" "decreasing tunnel MTU" || fail=1 1701 1702 # Increase tunnel MTU, check for PMTU increase in route exception 1703 mtu "${ns_a}" vti6_a 9000 1704 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})" 1705 check_pmtu_value "9000" "${pmtu}" "increasing tunnel MTU" || fail=1 1706 1707 return ${fail} 1708} 1709 1710test_pmtu_vti4_udp_routed_exception() { 1711 setup namespaces routing vti4routed xfrm4udprouted || return $ksft_skip 1712 trace "${ns_a}" veth_A-R1 "${ns_b}" veth_B-R1 \ 1713 "${ns_a}" vti4_a "${ns_b}" vti4_b 1714 1715 veth_mtu=1500 1716 vti_mtu=$((veth_mtu - 20)) 1717 1718 # UDP SPI SN IV ICV pad length next header 1719 esp_payload_rfc4106=$((vti_mtu - 8 - 4 - 4 - 8 - 16 - 1 - 1)) 1720 ping_payload=$((esp_payload_rfc4106 - 28)) 1721 1722 mtu "${ns_a}" veth_A-R1 ${veth_mtu} 1723 mtu "${ns_r1}" veth_R1-A ${veth_mtu} 1724 mtu "${ns_b}" veth_B-R1 ${veth_mtu} 1725 mtu "${ns_r1}" veth_R1-B ${veth_mtu} 1726 1727 mtu "${ns_a}" vti4_a ${vti_mtu} 1728 mtu "${ns_b}" vti4_b ${vti_mtu} 1729 1730 # Send DF packet without exceeding link layer MTU, check that no 1731 # exception is created 1732 run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s ${ping_payload} ${tunnel4_b_addr} 1733 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel4_b_addr})" 1734 check_pmtu_value "" "${pmtu}" "sending packet smaller than PMTU (IP payload length ${esp_payload_rfc4106})" || return 1 1735 1736 # Now decrease link layer MTU by 8 bytes on R1, check that exception is created 1737 # with the right PMTU value 1738 mtu "${ns_r1}" veth_R1-B $((veth_mtu - 8)) 1739 run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s $((ping_payload)) ${tunnel4_b_addr} 1740 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel4_b_addr})" 1741 check_pmtu_value "$((esp_payload_rfc4106 - 8))" "${pmtu}" "exceeding PMTU (IP payload length $((esp_payload_rfc4106)))" 1742} 1743 1744test_pmtu_vti6_udp_routed_exception() { 1745 setup namespaces routing vti6routed xfrm6udprouted || return $ksft_skip 1746 trace "${ns_a}" veth_A-R1 "${ns_b}" veth_B-R1 \ 1747 "${ns_a}" vti6_a "${ns_b}" vti6_b 1748 1749 veth_mtu=1500 1750 vti_mtu=$((veth_mtu - 40)) 1751 1752 # UDP SPI SN IV ICV pad length next header 1753 esp_payload_rfc4106=$((vti_mtu - 8 - 4 - 4 - 8 - 16 - 1 - 1)) 1754 ping_payload=$((esp_payload_rfc4106 - 48)) 1755 1756 mtu "${ns_a}" veth_A-R1 ${veth_mtu} 1757 mtu "${ns_r1}" veth_R1-A ${veth_mtu} 1758 mtu "${ns_b}" veth_B-R1 ${veth_mtu} 1759 mtu "${ns_r1}" veth_R1-B ${veth_mtu} 1760 1761 # mtu "${ns_a}" vti6_a ${vti_mtu} 1762 # mtu "${ns_b}" vti6_b ${vti_mtu} 1763 1764 run_cmd ${ns_a} ${ping6} -q -M want -i 0.1 -w 1 -s ${ping_payload} ${tunnel6_b_addr} 1765 1766 # Check that exception was not created 1767 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})" 1768 check_pmtu_value "" "${pmtu}" "sending packet smaller than PMTU (IP payload length ${esp_payload_rfc4106})" || return 1 1769 1770 # Now decrease link layer MTU by 8 bytes on R1, check that exception is created 1771 # with the right PMTU value 1772 mtu "${ns_r1}" veth_R1-B $((veth_mtu - 8)) 1773 run_cmd ${ns_a} ${ping6} -q -M want -i 0.1 -w 1 -s $((ping_payload)) ${tunnel6_b_addr} 1774 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})" 1775 check_pmtu_value "$((esp_payload_rfc4106 - 8))" "${pmtu}" "exceeding PMTU (IP payload length $((esp_payload_rfc4106)))" 1776 1777} 1778 1779test_pmtu_vti4_default_mtu() { 1780 setup namespaces veth vti4 || return $ksft_skip 1781 1782 # Check that MTU of vti device is MTU of veth minus IPv4 header length 1783 veth_mtu="$(link_get_mtu "${ns_a}" veth_a)" 1784 vti4_mtu="$(link_get_mtu "${ns_a}" vti4_a)" 1785 if [ $((veth_mtu - vti4_mtu)) -ne 20 ]; then 1786 err " vti MTU ${vti4_mtu} is not veth MTU ${veth_mtu} minus IPv4 header length" 1787 return 1 1788 fi 1789} 1790 1791test_pmtu_vti6_default_mtu() { 1792 setup namespaces veth vti6 || return $ksft_skip 1793 1794 # Check that MTU of vti device is MTU of veth minus IPv6 header length 1795 veth_mtu="$(link_get_mtu "${ns_a}" veth_a)" 1796 vti6_mtu="$(link_get_mtu "${ns_a}" vti6_a)" 1797 if [ $((veth_mtu - vti6_mtu)) -ne 40 ]; then 1798 err " vti MTU ${vti6_mtu} is not veth MTU ${veth_mtu} minus IPv6 header length" 1799 return 1 1800 fi 1801} 1802 1803test_pmtu_vti4_link_add_mtu() { 1804 setup namespaces || return $ksft_skip 1805 1806 run_cmd ${ns_a} ip link add vti4_a type vti local ${veth4_a_addr} remote ${veth4_b_addr} key 10 1807 [ $? -ne 0 ] && err " vti not supported" && return $ksft_skip 1808 run_cmd ${ns_a} ip link del vti4_a 1809 1810 fail=0 1811 1812 min=68 1813 max=$((65535 - 20)) 1814 # Check invalid values first 1815 for v in $((min - 1)) $((max + 1)); do 1816 run_cmd ${ns_a} ip link add vti4_a mtu ${v} type vti local ${veth4_a_addr} remote ${veth4_b_addr} key 10 1817 # This can fail, or MTU can be adjusted to a proper value 1818 [ $? -ne 0 ] && continue 1819 mtu="$(link_get_mtu "${ns_a}" vti4_a)" 1820 if [ ${mtu} -lt ${min} -o ${mtu} -gt ${max} ]; then 1821 err " vti tunnel created with invalid MTU ${mtu}" 1822 fail=1 1823 fi 1824 run_cmd ${ns_a} ip link del vti4_a 1825 done 1826 1827 # Now check valid values 1828 for v in ${min} 1300 ${max}; do 1829 run_cmd ${ns_a} ip link add vti4_a mtu ${v} type vti local ${veth4_a_addr} remote ${veth4_b_addr} key 10 1830 mtu="$(link_get_mtu "${ns_a}" vti4_a)" 1831 run_cmd ${ns_a} ip link del vti4_a 1832 if [ "${mtu}" != "${v}" ]; then 1833 err " vti MTU ${mtu} doesn't match configured value ${v}" 1834 fail=1 1835 fi 1836 done 1837 1838 return ${fail} 1839} 1840 1841test_pmtu_vti6_link_add_mtu() { 1842 setup namespaces || return $ksft_skip 1843 1844 run_cmd ${ns_a} ip link add vti6_a type vti6 local ${veth6_a_addr} remote ${veth6_b_addr} key 10 1845 [ $? -ne 0 ] && err " vti6 not supported" && return $ksft_skip 1846 run_cmd ${ns_a} ip link del vti6_a 1847 1848 fail=0 1849 1850 min=68 # vti6 can carry IPv4 packets too 1851 max=$((65535 - 40)) 1852 # Check invalid values first 1853 for v in $((min - 1)) $((max + 1)); do 1854 run_cmd ${ns_a} ip link add vti6_a mtu ${v} type vti6 local ${veth6_a_addr} remote ${veth6_b_addr} key 10 1855 # This can fail, or MTU can be adjusted to a proper value 1856 [ $? -ne 0 ] && continue 1857 mtu="$(link_get_mtu "${ns_a}" vti6_a)" 1858 if [ ${mtu} -lt ${min} -o ${mtu} -gt ${max} ]; then 1859 err " vti6 tunnel created with invalid MTU ${v}" 1860 fail=1 1861 fi 1862 run_cmd ${ns_a} ip link del vti6_a 1863 done 1864 1865 # Now check valid values 1866 for v in 68 1280 1300 $((65535 - 40)); do 1867 run_cmd ${ns_a} ip link add vti6_a mtu ${v} type vti6 local ${veth6_a_addr} remote ${veth6_b_addr} key 10 1868 mtu="$(link_get_mtu "${ns_a}" vti6_a)" 1869 run_cmd ${ns_a} ip link del vti6_a 1870 if [ "${mtu}" != "${v}" ]; then 1871 err " vti6 MTU ${mtu} doesn't match configured value ${v}" 1872 fail=1 1873 fi 1874 done 1875 1876 return ${fail} 1877} 1878 1879test_pmtu_vti6_link_change_mtu() { 1880 setup namespaces || return $ksft_skip 1881 1882 run_cmd ${ns_a} ip link add dummy0 mtu 1500 type dummy 1883 [ $? -ne 0 ] && err " dummy not supported" && return $ksft_skip 1884 run_cmd ${ns_a} ip link add dummy1 mtu 3000 type dummy 1885 run_cmd ${ns_a} ip link set dummy0 up 1886 run_cmd ${ns_a} ip link set dummy1 up 1887 1888 run_cmd ${ns_a} ip addr add ${dummy6_0_prefix}1/${dummy6_mask} dev dummy0 1889 run_cmd ${ns_a} ip addr add ${dummy6_1_prefix}1/${dummy6_mask} dev dummy1 1890 1891 fail=0 1892 1893 # Create vti6 interface bound to device, passing MTU, check it 1894 run_cmd ${ns_a} ip link add vti6_a mtu 1300 type vti6 remote ${dummy6_0_prefix}2 local ${dummy6_0_prefix}1 1895 mtu="$(link_get_mtu "${ns_a}" vti6_a)" 1896 if [ ${mtu} -ne 1300 ]; then 1897 err " vti6 MTU ${mtu} doesn't match configured value 1300" 1898 fail=1 1899 fi 1900 1901 # Move to another device with different MTU, without passing MTU, check 1902 # MTU is adjusted 1903 run_cmd ${ns_a} ip link set vti6_a type vti6 remote ${dummy6_1_prefix}2 local ${dummy6_1_prefix}1 1904 mtu="$(link_get_mtu "${ns_a}" vti6_a)" 1905 if [ ${mtu} -ne $((3000 - 40)) ]; then 1906 err " vti MTU ${mtu} is not dummy MTU 3000 minus IPv6 header length" 1907 fail=1 1908 fi 1909 1910 # Move it back, passing MTU, check MTU is not overridden 1911 run_cmd ${ns_a} ip link set vti6_a mtu 1280 type vti6 remote ${dummy6_0_prefix}2 local ${dummy6_0_prefix}1 1912 mtu="$(link_get_mtu "${ns_a}" vti6_a)" 1913 if [ ${mtu} -ne 1280 ]; then 1914 err " vti6 MTU ${mtu} doesn't match configured value 1280" 1915 fail=1 1916 fi 1917 1918 return ${fail} 1919} 1920 1921check_command() { 1922 cmd=${1} 1923 1924 if ! which ${cmd} > /dev/null 2>&1; then 1925 err " missing required command: '${cmd}'" 1926 return 1 1927 fi 1928 return 0 1929} 1930 1931test_cleanup_vxlanX_exception() { 1932 outer="${1}" 1933 encap="vxlan" 1934 ll_mtu=4000 1935 1936 check_command taskset || return $ksft_skip 1937 cpu_list=$(grep -m 2 processor /proc/cpuinfo | cut -d ' ' -f 2) 1938 1939 setup namespaces routing ${encap}${outer} || return $ksft_skip 1940 trace "${ns_a}" ${encap}_a "${ns_b}" ${encap}_b \ 1941 "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \ 1942 "${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B 1943 1944 # Create route exception by exceeding link layer MTU 1945 mtu "${ns_a}" veth_A-R1 $((${ll_mtu} + 1000)) 1946 mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000)) 1947 mtu "${ns_b}" veth_B-R1 ${ll_mtu} 1948 mtu "${ns_r1}" veth_R1-B ${ll_mtu} 1949 1950 mtu "${ns_a}" ${encap}_a $((${ll_mtu} + 1000)) 1951 mtu "${ns_b}" ${encap}_b $((${ll_mtu} + 1000)) 1952 1953 # Fill exception cache for multiple CPUs (2) 1954 # we can always use inner IPv4 for that 1955 for cpu in ${cpu_list}; do 1956 run_cmd taskset --cpu-list ${cpu} ${ns_a} ping -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${tunnel4_b_addr} 1957 done 1958 1959 ${ns_a} ip link del dev veth_A-R1 & 1960 iplink_pid=$! 1961 sleep 1 1962 if [ "$(cat /proc/${iplink_pid}/cmdline 2>/dev/null | tr -d '\0')" = "iplinkdeldevveth_A-R1" ]; then 1963 err " can't delete veth device in a timely manner, PMTU dst likely leaked" 1964 return 1 1965 fi 1966} 1967 1968test_cleanup_ipv6_exception() { 1969 test_cleanup_vxlanX_exception 6 1970} 1971 1972test_cleanup_ipv4_exception() { 1973 test_cleanup_vxlanX_exception 4 1974} 1975 1976run_test() { 1977 ( 1978 tname="$1" 1979 tdesc="$2" 1980 1981 unset IFS 1982 1983 # Since cleanup() relies on variables modified by this subshell, it 1984 # has to run in this context. 1985 trap cleanup EXIT 1986 1987 if [ "$VERBOSE" = "1" ]; then 1988 printf "\n##########################################################################\n\n" 1989 fi 1990 1991 eval test_${tname} 1992 ret=$? 1993 1994 if [ $ret -eq 0 ]; then 1995 printf "TEST: %-60s [ OK ]\n" "${tdesc}" 1996 elif [ $ret -eq 1 ]; then 1997 printf "TEST: %-60s [FAIL]\n" "${tdesc}" 1998 if [ "${PAUSE_ON_FAIL}" = "yes" ]; then 1999 echo 2000 echo "Pausing. Hit enter to continue" 2001 read a 2002 fi 2003 err_flush 2004 exit 1 2005 elif [ $ret -eq $ksft_skip ]; then 2006 printf "TEST: %-60s [SKIP]\n" "${tdesc}" 2007 err_flush 2008 fi 2009 2010 return $ret 2011 ) 2012 ret=$? 2013 case $ret in 2014 0) 2015 all_skipped=false 2016 [ $exitcode=$ksft_skip ] && exitcode=0 2017 ;; 2018 $ksft_skip) 2019 [ $all_skipped = true ] && exitcode=$ksft_skip 2020 ;; 2021 *) 2022 all_skipped=false 2023 exitcode=1 2024 ;; 2025 esac 2026 2027 return $ret 2028} 2029 2030run_test_nh() { 2031 tname="$1" 2032 tdesc="$2" 2033 2034 USE_NH=yes 2035 run_test "${tname}" "${tdesc} - nexthop objects" 2036 USE_NH=no 2037} 2038 2039test_list_flush_ipv4_exception() { 2040 setup namespaces routing || return $ksft_skip 2041 trace "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \ 2042 "${ns_r1}" veth_R1-B "${ns_b}" veth_B-R1 \ 2043 "${ns_a}" veth_A-R2 "${ns_r2}" veth_R2-A \ 2044 "${ns_r2}" veth_R2-B "${ns_b}" veth_B-R2 2045 2046 dst_prefix1="${prefix4}.${b_r1}." 2047 dst2="${prefix4}.${b_r2}.1" 2048 2049 # Set up initial MTU values 2050 mtu "${ns_a}" veth_A-R1 2000 2051 mtu "${ns_r1}" veth_R1-A 2000 2052 mtu "${ns_r1}" veth_R1-B 1500 2053 mtu "${ns_b}" veth_B-R1 1500 2054 2055 mtu "${ns_a}" veth_A-R2 2000 2056 mtu "${ns_r2}" veth_R2-A 2000 2057 mtu "${ns_r2}" veth_R2-B 1500 2058 mtu "${ns_b}" veth_B-R2 1500 2059 2060 fail=0 2061 2062 # Add 100 addresses for veth endpoint on B reached by default A route 2063 for i in $(seq 100 199); do 2064 run_cmd ${ns_b} ip addr add "${dst_prefix1}${i}" dev veth_B-R1 2065 done 2066 2067 # Create 100 cached route exceptions for path via R1, one via R2. Note 2068 # that with IPv4 we need to actually cause a route lookup that matches 2069 # the exception caused by ICMP, in order to actually have a cached 2070 # route, so we need to ping each destination twice 2071 for i in $(seq 100 199); do 2072 run_cmd ${ns_a} ping -q -M want -i 0.1 -c 2 -s 1800 "${dst_prefix1}${i}" 2073 done 2074 run_cmd ${ns_a} ping -q -M want -i 0.1 -c 2 -s 1800 "${dst2}" 2075 2076 if [ "$(${ns_a} ip -oneline route list cache | wc -l)" -ne 101 ]; then 2077 err " can't list cached exceptions" 2078 fail=1 2079 fi 2080 2081 run_cmd ${ns_a} ip route flush cache 2082 pmtu1="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst_prefix}1)" 2083 pmtu2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst_prefix}2)" 2084 if [ -n "${pmtu1}" ] || [ -n "${pmtu2}" ] || \ 2085 [ -n "$(${ns_a} ip route list cache)" ]; then 2086 err " can't flush cached exceptions" 2087 fail=1 2088 fi 2089 2090 return ${fail} 2091} 2092 2093test_list_flush_ipv6_exception() { 2094 setup namespaces routing || return $ksft_skip 2095 trace "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \ 2096 "${ns_r1}" veth_R1-B "${ns_b}" veth_B-R1 \ 2097 "${ns_a}" veth_A-R2 "${ns_r2}" veth_R2-A \ 2098 "${ns_r2}" veth_R2-B "${ns_b}" veth_B-R2 2099 2100 dst_prefix1="${prefix6}:${b_r1}::" 2101 dst2="${prefix6}:${b_r2}::1" 2102 2103 # Set up initial MTU values 2104 mtu "${ns_a}" veth_A-R1 2000 2105 mtu "${ns_r1}" veth_R1-A 2000 2106 mtu "${ns_r1}" veth_R1-B 1500 2107 mtu "${ns_b}" veth_B-R1 1500 2108 2109 mtu "${ns_a}" veth_A-R2 2000 2110 mtu "${ns_r2}" veth_R2-A 2000 2111 mtu "${ns_r2}" veth_R2-B 1500 2112 mtu "${ns_b}" veth_B-R2 1500 2113 2114 fail=0 2115 2116 # Add 100 addresses for veth endpoint on B reached by default A route 2117 for i in $(seq 100 199); do 2118 run_cmd ${ns_b} ip addr add "${dst_prefix1}${i}" dev veth_B-R1 2119 done 2120 2121 # Create 100 cached route exceptions for path via R1, one via R2 2122 for i in $(seq 100 199); do 2123 run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s 1800 "${dst_prefix1}${i}" 2124 done 2125 run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s 1800 "${dst2}" 2126 if [ "$(${ns_a} ip -oneline -6 route list cache | wc -l)" -ne 101 ]; then 2127 err " can't list cached exceptions" 2128 fail=1 2129 fi 2130 2131 run_cmd ${ns_a} ip -6 route flush cache 2132 pmtu1="$(route_get_dst_pmtu_from_exception "${ns_a}" "${dst_prefix1}100")" 2133 pmtu2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})" 2134 if [ -n "${pmtu1}" ] || [ -n "${pmtu2}" ] || \ 2135 [ -n "$(${ns_a} ip -6 route list cache)" ]; then 2136 err " can't flush cached exceptions" 2137 fail=1 2138 fi 2139 2140 return ${fail} 2141} 2142 2143test_pmtu_ipvX_route_change() { 2144 family=${1} 2145 2146 setup namespaces routing || return 2 2147 trace "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \ 2148 "${ns_r1}" veth_R1-B "${ns_b}" veth_B-R1 \ 2149 "${ns_a}" veth_A-R2 "${ns_r2}" veth_R2-A \ 2150 "${ns_r2}" veth_R2-B "${ns_b}" veth_B-R2 2151 2152 if [ ${family} -eq 4 ]; then 2153 ping=ping 2154 dst1="${prefix4}.${b_r1}.1" 2155 dst2="${prefix4}.${b_r2}.1" 2156 gw="${prefix4}.${a_r1}.2" 2157 else 2158 ping=${ping6} 2159 dst1="${prefix6}:${b_r1}::1" 2160 dst2="${prefix6}:${b_r2}::1" 2161 gw="${prefix6}:${a_r1}::2" 2162 fi 2163 2164 # Set up initial MTU values 2165 mtu "${ns_a}" veth_A-R1 2000 2166 mtu "${ns_r1}" veth_R1-A 2000 2167 mtu "${ns_r1}" veth_R1-B 1400 2168 mtu "${ns_b}" veth_B-R1 1400 2169 2170 mtu "${ns_a}" veth_A-R2 2000 2171 mtu "${ns_r2}" veth_R2-A 2000 2172 mtu "${ns_r2}" veth_R2-B 1500 2173 mtu "${ns_b}" veth_B-R2 1500 2174 2175 # Create route exceptions 2176 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1800 ${dst1} 2177 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1800 ${dst2} 2178 2179 # Check that exceptions have been created with the correct PMTU 2180 pmtu_1="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst1})" 2181 check_pmtu_value "1400" "${pmtu_1}" "exceeding MTU" || return 1 2182 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})" 2183 check_pmtu_value "1500" "${pmtu_2}" "exceeding MTU" || return 1 2184 2185 # Replace the route from A to R1 2186 run_cmd ${ns_a} ip route change default via ${gw} 2187 2188 # Delete the device in A 2189 run_cmd ${ns_a} ip link del "veth_A-R1" 2190} 2191 2192test_pmtu_ipv4_route_change() { 2193 test_pmtu_ipvX_route_change 4 2194} 2195 2196test_pmtu_ipv6_route_change() { 2197 test_pmtu_ipvX_route_change 6 2198} 2199 2200usage() { 2201 echo 2202 echo "$0 [OPTIONS] [TEST]..." 2203 echo "If no TEST argument is given, all tests will be run." 2204 echo 2205 echo "Options" 2206 echo " --trace: capture traffic to TEST_INTERFACE.pcap" 2207 echo 2208 echo "Available tests${tests}" 2209 exit 1 2210} 2211 2212################################################################################ 2213# 2214exitcode=0 2215desc=0 2216all_skipped=true 2217 2218while getopts :ptv o 2219do 2220 case $o in 2221 p) PAUSE_ON_FAIL=yes;; 2222 v) VERBOSE=1;; 2223 t) if which tcpdump > /dev/null 2>&1; then 2224 TRACING=1 2225 else 2226 echo "=== tcpdump not available, tracing disabled" 2227 fi 2228 ;; 2229 *) usage;; 2230 esac 2231done 2232shift $(($OPTIND-1)) 2233 2234IFS=" 2235" 2236 2237for arg do 2238 # Check first that all requested tests are available before running any 2239 command -v > /dev/null "test_${arg}" || { echo "=== Test ${arg} not found"; usage; } 2240done 2241 2242trap cleanup EXIT 2243 2244# start clean 2245cleanup 2246 2247HAVE_NH=no 2248ip nexthop ls >/dev/null 2>&1 2249[ $? -eq 0 ] && HAVE_NH=yes 2250 2251name="" 2252desc="" 2253rerun_nh=0 2254for t in ${tests}; do 2255 [ "${name}" = "" ] && name="${t}" && continue 2256 [ "${desc}" = "" ] && desc="${t}" && continue 2257 2258 if [ "${HAVE_NH}" = "yes" ]; then 2259 rerun_nh="${t}" 2260 fi 2261 2262 run_this=1 2263 for arg do 2264 [ "${arg}" != "${arg#--*}" ] && continue 2265 [ "${arg}" = "${name}" ] && run_this=1 && break 2266 run_this=0 2267 done 2268 if [ $run_this -eq 1 ]; then 2269 run_test "${name}" "${desc}" 2270 # if test was skipped no need to retry with nexthop objects 2271 [ $? -eq $ksft_skip ] && rerun_nh=0 2272 2273 if [ "${rerun_nh}" = "1" ]; then 2274 run_test_nh "${name}" "${desc}" 2275 fi 2276 fi 2277 name="" 2278 desc="" 2279 rerun_nh=0 2280done 2281 2282exit ${exitcode} 2283