1#!/bin/bash 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 201source lib.sh 202 203PAUSE_ON_FAIL=no 204VERBOSE=0 205TRACING=0 206 207# Some systems don't have a ping6 binary anymore 208which ping6 > /dev/null 2>&1 && ping6=$(which ping6) || ping6=$(which ping) 209 210# Name Description re-run with nh 211tests=" 212 pmtu_ipv4_exception ipv4: PMTU exceptions 1 213 pmtu_ipv6_exception ipv6: PMTU exceptions 1 214 pmtu_ipv4_dscp_icmp_exception ICMPv4 with DSCP and ECN: PMTU exceptions 1 215 pmtu_ipv4_dscp_udp_exception UDPv4 with DSCP and ECN: PMTU exceptions 1 216 pmtu_ipv4_vxlan4_exception IPv4 over vxlan4: PMTU exceptions 1 217 pmtu_ipv6_vxlan4_exception IPv6 over vxlan4: PMTU exceptions 1 218 pmtu_ipv4_vxlan6_exception IPv4 over vxlan6: PMTU exceptions 1 219 pmtu_ipv6_vxlan6_exception IPv6 over vxlan6: PMTU exceptions 1 220 pmtu_ipv4_geneve4_exception IPv4 over geneve4: PMTU exceptions 1 221 pmtu_ipv6_geneve4_exception IPv6 over geneve4: PMTU exceptions 1 222 pmtu_ipv4_geneve6_exception IPv4 over geneve6: PMTU exceptions 1 223 pmtu_ipv6_geneve6_exception IPv6 over geneve6: PMTU exceptions 1 224 pmtu_ipv4_br_vxlan4_exception IPv4, bridged vxlan4: PMTU exceptions 1 225 pmtu_ipv6_br_vxlan4_exception IPv6, bridged vxlan4: PMTU exceptions 1 226 pmtu_ipv4_br_vxlan6_exception IPv4, bridged vxlan6: PMTU exceptions 1 227 pmtu_ipv6_br_vxlan6_exception IPv6, bridged vxlan6: PMTU exceptions 1 228 pmtu_ipv4_br_geneve4_exception IPv4, bridged geneve4: PMTU exceptions 1 229 pmtu_ipv6_br_geneve4_exception IPv6, bridged geneve4: PMTU exceptions 1 230 pmtu_ipv4_br_geneve6_exception IPv4, bridged geneve6: PMTU exceptions 1 231 pmtu_ipv6_br_geneve6_exception IPv6, bridged geneve6: PMTU exceptions 1 232 pmtu_ipv4_ovs_vxlan4_exception IPv4, OVS vxlan4: PMTU exceptions 1 233 pmtu_ipv6_ovs_vxlan4_exception IPv6, OVS vxlan4: PMTU exceptions 1 234 pmtu_ipv4_ovs_vxlan6_exception IPv4, OVS vxlan6: PMTU exceptions 1 235 pmtu_ipv6_ovs_vxlan6_exception IPv6, OVS vxlan6: PMTU exceptions 1 236 pmtu_ipv4_ovs_geneve4_exception IPv4, OVS geneve4: PMTU exceptions 1 237 pmtu_ipv6_ovs_geneve4_exception IPv6, OVS geneve4: PMTU exceptions 1 238 pmtu_ipv4_ovs_geneve6_exception IPv4, OVS geneve6: PMTU exceptions 1 239 pmtu_ipv6_ovs_geneve6_exception IPv6, OVS geneve6: PMTU exceptions 1 240 pmtu_ipv4_fou4_exception IPv4 over fou4: PMTU exceptions 1 241 pmtu_ipv6_fou4_exception IPv6 over fou4: PMTU exceptions 1 242 pmtu_ipv4_fou6_exception IPv4 over fou6: PMTU exceptions 1 243 pmtu_ipv6_fou6_exception IPv6 over fou6: PMTU exceptions 1 244 pmtu_ipv4_gue4_exception IPv4 over gue4: PMTU exceptions 1 245 pmtu_ipv6_gue4_exception IPv6 over gue4: PMTU exceptions 1 246 pmtu_ipv4_gue6_exception IPv4 over gue6: PMTU exceptions 1 247 pmtu_ipv6_gue6_exception IPv6 over gue6: PMTU exceptions 1 248 pmtu_ipv4_ipv4_exception IPv4 over IPv4: PMTU exceptions 1 249 pmtu_ipv6_ipv4_exception IPv6 over IPv4: PMTU exceptions 1 250 pmtu_ipv4_ipv6_exception IPv4 over IPv6: PMTU exceptions 1 251 pmtu_ipv6_ipv6_exception IPv6 over IPv6: PMTU exceptions 1 252 pmtu_vti6_exception vti6: PMTU exceptions 0 253 pmtu_vti4_exception vti4: PMTU exceptions 0 254 pmtu_vti6_udp_exception vti6: PMTU exceptions (ESP-in-UDP) 0 255 pmtu_vti4_udp_exception vti4: PMTU exceptions (ESP-in-UDP) 0 256 pmtu_vti6_udp_routed_exception vti6: PMTU exceptions, routed (ESP-in-UDP) 0 257 pmtu_vti4_udp_routed_exception vti4: PMTU exceptions, routed (ESP-in-UDP) 0 258 pmtu_vti4_default_mtu vti4: default MTU assignment 0 259 pmtu_vti6_default_mtu vti6: default MTU assignment 0 260 pmtu_vti4_link_add_mtu vti4: MTU setting on link creation 0 261 pmtu_vti6_link_add_mtu vti6: MTU setting on link creation 0 262 pmtu_vti6_link_change_mtu vti6: MTU changes on link changes 0 263 cleanup_ipv4_exception ipv4: cleanup of cached exceptions 1 264 cleanup_ipv6_exception ipv6: cleanup of cached exceptions 1 265 list_flush_ipv4_exception ipv4: list and flush cached exceptions 1 266 list_flush_ipv6_exception ipv6: list and flush cached exceptions 1 267 pmtu_ipv4_route_change ipv4: PMTU exception w/route replace 1 268 pmtu_ipv6_route_change ipv6: PMTU exception w/route replace 1" 269 270# Addressing and routing for tests with routers: four network segments, with 271# index SEGMENT between 1 and 4, a common prefix (PREFIX4 or PREFIX6) and an 272# identifier ID, which is 1 for hosts (A and B), 2 for routers (R1 and R2). 273# Addresses are: 274# - IPv4: PREFIX4.SEGMENT.ID (/24) 275# - IPv6: PREFIX6:SEGMENT::ID (/64) 276prefix4="10.0" 277prefix6="fc00" 278a_r1=1 279a_r2=2 280b_r1=3 281b_r2=4 282# ns peer segment 283routing_addrs=" 284 A R1 ${a_r1} 285 A R2 ${a_r2} 286 B R1 ${b_r1} 287 B R2 ${b_r2} 288" 289# Traffic from A to B goes through R1 by default, and through R2, if destined to 290# B's address on the b_r2 segment. 291# Traffic from B to A goes through R1. 292# ns destination gateway 293routes=" 294 A default ${prefix4}.${a_r1}.2 295 A ${prefix4}.${b_r2}.1 ${prefix4}.${a_r2}.2 296 B default ${prefix4}.${b_r1}.2 297 298 A default ${prefix6}:${a_r1}::2 299 A ${prefix6}:${b_r2}::1 ${prefix6}:${a_r2}::2 300 B default ${prefix6}:${b_r1}::2 301" 302USE_NH="no" 303# ns family nh id destination gateway 304nexthops=" 305 A 4 41 ${prefix4}.${a_r1}.2 veth_A-R1 306 A 4 42 ${prefix4}.${a_r2}.2 veth_A-R2 307 B 4 41 ${prefix4}.${b_r1}.2 veth_B-R1 308 309 A 6 61 ${prefix6}:${a_r1}::2 veth_A-R1 310 A 6 62 ${prefix6}:${a_r2}::2 veth_A-R2 311 B 6 61 ${prefix6}:${b_r1}::2 veth_B-R1 312" 313 314# nexthop id correlates to id in nexthops config above 315# ns family prefix nh id 316routes_nh=" 317 A 4 default 41 318 A 4 ${prefix4}.${b_r2}.1 42 319 B 4 default 41 320 321 A 6 default 61 322 A 6 ${prefix6}:${b_r2}::1 62 323 B 6 default 61 324" 325 326policy_mark=0x04 327rt_table=main 328 329veth4_a_addr="192.168.1.1" 330veth4_b_addr="192.168.1.2" 331veth4_c_addr="192.168.2.10" 332veth4_mask="24" 333veth6_a_addr="fd00:1::a" 334veth6_b_addr="fd00:1::b" 335veth6_c_addr="fd00:2::c" 336veth6_mask="64" 337 338tunnel4_a_addr="192.168.2.1" 339tunnel4_b_addr="192.168.2.2" 340tunnel4_mask="24" 341tunnel6_a_addr="fd00:2::a" 342tunnel6_b_addr="fd00:2::b" 343tunnel6_mask="64" 344 345dummy6_0_prefix="fc00:1000::" 346dummy6_1_prefix="fc00:1001::" 347dummy6_mask="64" 348 349err_buf= 350tcpdump_pids= 351nettest_pids= 352socat_pids= 353tmpoutfile= 354 355err() { 356 err_buf="${err_buf}${1} 357" 358} 359 360err_flush() { 361 echo -n "${err_buf}" 362 err_buf= 363} 364 365run_cmd() { 366 cmd="$*" 367 368 if [ "$VERBOSE" = "1" ]; then 369 printf " COMMAND: $cmd\n" 370 fi 371 372 out="$($cmd 2>&1)" 373 rc=$? 374 if [ "$VERBOSE" = "1" -a -n "$out" ]; then 375 echo " $out" 376 echo 377 fi 378 379 return $rc 380} 381 382run_cmd_bg() { 383 cmd="$*" 384 385 if [ "$VERBOSE" = "1" ]; then 386 printf " COMMAND: %s &\n" "${cmd}" 387 fi 388 389 $cmd 2>&1 & 390} 391 392# Find the auto-generated name for this namespace 393nsname() { 394 eval echo \$NS_$1 395} 396 397setup_fou_or_gue() { 398 outer="${1}" 399 inner="${2}" 400 encap="${3}" 401 402 if [ "${outer}" = "4" ]; then 403 modprobe fou || return $ksft_skip 404 a_addr="${prefix4}.${a_r1}.1" 405 b_addr="${prefix4}.${b_r1}.1" 406 if [ "${inner}" = "4" ]; then 407 type="ipip" 408 ipproto="4" 409 else 410 type="sit" 411 ipproto="41" 412 fi 413 else 414 modprobe fou6 || return $ksft_skip 415 a_addr="${prefix6}:${a_r1}::1" 416 b_addr="${prefix6}:${b_r1}::1" 417 if [ "${inner}" = "4" ]; then 418 type="ip6tnl" 419 mode="mode ipip6" 420 ipproto="4 -6" 421 else 422 type="ip6tnl" 423 mode="mode ip6ip6" 424 ipproto="41 -6" 425 fi 426 fi 427 428 run_cmd ${ns_a} ip fou add port 5555 ipproto ${ipproto} || return $ksft_skip 429 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 430 431 run_cmd ${ns_b} ip fou add port 5556 ipproto ${ipproto} 432 run_cmd ${ns_b} ip link add ${encap}_b type ${type} ${mode} local ${b_addr} remote ${a_addr} encap ${encap} encap-sport auto encap-dport 5555 433 434 if [ "${inner}" = "4" ]; then 435 run_cmd ${ns_a} ip addr add ${tunnel4_a_addr}/${tunnel4_mask} dev ${encap}_a 436 run_cmd ${ns_b} ip addr add ${tunnel4_b_addr}/${tunnel4_mask} dev ${encap}_b 437 else 438 run_cmd ${ns_a} ip addr add ${tunnel6_a_addr}/${tunnel6_mask} dev ${encap}_a 439 run_cmd ${ns_b} ip addr add ${tunnel6_b_addr}/${tunnel6_mask} dev ${encap}_b 440 fi 441 442 run_cmd ${ns_a} ip link set ${encap}_a up 443 run_cmd ${ns_b} ip link set ${encap}_b up 444} 445 446setup_fou44() { 447 setup_fou_or_gue 4 4 fou 448} 449 450setup_fou46() { 451 setup_fou_or_gue 4 6 fou 452} 453 454setup_fou64() { 455 setup_fou_or_gue 6 4 fou 456} 457 458setup_fou66() { 459 setup_fou_or_gue 6 6 fou 460} 461 462setup_gue44() { 463 setup_fou_or_gue 4 4 gue 464} 465 466setup_gue46() { 467 setup_fou_or_gue 4 6 gue 468} 469 470setup_gue64() { 471 setup_fou_or_gue 6 4 gue 472} 473 474setup_gue66() { 475 setup_fou_or_gue 6 6 gue 476} 477 478setup_ipvX_over_ipvY() { 479 inner=${1} 480 outer=${2} 481 482 if [ "${outer}" -eq 4 ]; then 483 a_addr="${prefix4}.${a_r1}.1" 484 b_addr="${prefix4}.${b_r1}.1" 485 if [ "${inner}" -eq 4 ]; then 486 type="ipip" 487 mode="ipip" 488 else 489 type="sit" 490 mode="ip6ip" 491 fi 492 else 493 a_addr="${prefix6}:${a_r1}::1" 494 b_addr="${prefix6}:${b_r1}::1" 495 type="ip6tnl" 496 if [ "${inner}" -eq 4 ]; then 497 mode="ipip6" 498 else 499 mode="ip6ip6" 500 fi 501 fi 502 503 run_cmd ${ns_a} ip link add ip_a type ${type} local ${a_addr} remote ${b_addr} mode ${mode} || return $ksft_skip 504 run_cmd ${ns_b} ip link add ip_b type ${type} local ${b_addr} remote ${a_addr} mode ${mode} 505 506 run_cmd ${ns_a} ip link set ip_a up 507 run_cmd ${ns_b} ip link set ip_b up 508 509 if [ "${inner}" = "4" ]; then 510 run_cmd ${ns_a} ip addr add ${tunnel4_a_addr}/${tunnel4_mask} dev ip_a 511 run_cmd ${ns_b} ip addr add ${tunnel4_b_addr}/${tunnel4_mask} dev ip_b 512 else 513 run_cmd ${ns_a} ip addr add ${tunnel6_a_addr}/${tunnel6_mask} dev ip_a 514 run_cmd ${ns_b} ip addr add ${tunnel6_b_addr}/${tunnel6_mask} dev ip_b 515 fi 516} 517 518setup_ip4ip4() { 519 setup_ipvX_over_ipvY 4 4 520} 521 522setup_ip6ip4() { 523 setup_ipvX_over_ipvY 6 4 524} 525 526setup_ip4ip6() { 527 setup_ipvX_over_ipvY 4 6 528} 529 530setup_ip6ip6() { 531 setup_ipvX_over_ipvY 6 6 532} 533 534setup_namespaces() { 535 setup_ns NS_A NS_B NS_C NS_R1 NS_R2 536 for n in ${NS_A} ${NS_B} ${NS_C} ${NS_R1} ${NS_R2}; do 537 # Disable DAD, so that we don't have to wait to use the 538 # configured IPv6 addresses 539 ip netns exec ${n} sysctl -q net/ipv6/conf/default/accept_dad=0 540 done 541 ns_a="ip netns exec ${NS_A}" 542 ns_b="ip netns exec ${NS_B}" 543 ns_c="ip netns exec ${NS_C}" 544 ns_r1="ip netns exec ${NS_R1}" 545 ns_r2="ip netns exec ${NS_R2}" 546} 547 548setup_veth() { 549 run_cmd ${ns_a} ip link add veth_a type veth peer name veth_b || return 1 550 run_cmd ${ns_a} ip link set veth_b netns ${NS_B} 551 552 run_cmd ${ns_a} ip addr add ${veth4_a_addr}/${veth4_mask} dev veth_a 553 run_cmd ${ns_b} ip addr add ${veth4_b_addr}/${veth4_mask} dev veth_b 554 555 run_cmd ${ns_a} ip addr add ${veth6_a_addr}/${veth6_mask} dev veth_a 556 run_cmd ${ns_b} ip addr add ${veth6_b_addr}/${veth6_mask} dev veth_b 557 558 run_cmd ${ns_a} ip link set veth_a up 559 run_cmd ${ns_b} ip link set veth_b up 560} 561 562setup_vti() { 563 proto=${1} 564 veth_a_addr="${2}" 565 veth_b_addr="${3}" 566 vti_a_addr="${4}" 567 vti_b_addr="${5}" 568 vti_mask=${6} 569 570 [ ${proto} -eq 6 ] && vti_type="vti6" || vti_type="vti" 571 572 run_cmd ${ns_a} ip link add vti${proto}_a type ${vti_type} local ${veth_a_addr} remote ${veth_b_addr} key 10 || return 1 573 run_cmd ${ns_b} ip link add vti${proto}_b type ${vti_type} local ${veth_b_addr} remote ${veth_a_addr} key 10 574 575 run_cmd ${ns_a} ip addr add ${vti_a_addr}/${vti_mask} dev vti${proto}_a 576 run_cmd ${ns_b} ip addr add ${vti_b_addr}/${vti_mask} dev vti${proto}_b 577 578 run_cmd ${ns_a} ip link set vti${proto}_a up 579 run_cmd ${ns_b} ip link set vti${proto}_b up 580} 581 582setup_vti4() { 583 setup_vti 4 ${veth4_a_addr} ${veth4_b_addr} ${tunnel4_a_addr} ${tunnel4_b_addr} ${tunnel4_mask} 584} 585 586setup_vti6() { 587 setup_vti 6 ${veth6_a_addr} ${veth6_b_addr} ${tunnel6_a_addr} ${tunnel6_b_addr} ${tunnel6_mask} 588} 589 590setup_vti4routed() { 591 setup_vti 4 ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1 ${tunnel4_a_addr} ${tunnel4_b_addr} ${tunnel4_mask} 592} 593 594setup_vti6routed() { 595 setup_vti 6 ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 ${tunnel6_a_addr} ${tunnel6_b_addr} ${tunnel6_mask} 596} 597 598setup_vxlan_or_geneve() { 599 type="${1}" 600 a_addr="${2}" 601 b_addr="${3}" 602 opts="${4}" 603 br_if_a="${5}" 604 605 if [ "${type}" = "vxlan" ]; then 606 opts="${opts} ttl 64 dstport 4789" 607 opts_a="local ${a_addr}" 608 opts_b="local ${b_addr}" 609 else 610 opts_a="" 611 opts_b="" 612 fi 613 614 run_cmd ${ns_a} ip link add ${type}_a type ${type} id 1 ${opts_a} remote ${b_addr} ${opts} || return 1 615 run_cmd ${ns_b} ip link add ${type}_b type ${type} id 1 ${opts_b} remote ${a_addr} ${opts} 616 617 if [ -n "${br_if_a}" ]; then 618 run_cmd ${ns_a} ip addr add ${tunnel4_a_addr}/${tunnel4_mask} dev ${br_if_a} 619 run_cmd ${ns_a} ip addr add ${tunnel6_a_addr}/${tunnel6_mask} dev ${br_if_a} 620 run_cmd ${ns_a} ip link set ${type}_a master ${br_if_a} 621 else 622 run_cmd ${ns_a} ip addr add ${tunnel4_a_addr}/${tunnel4_mask} dev ${type}_a 623 run_cmd ${ns_a} ip addr add ${tunnel6_a_addr}/${tunnel6_mask} dev ${type}_a 624 fi 625 626 run_cmd ${ns_b} ip addr add ${tunnel4_b_addr}/${tunnel4_mask} dev ${type}_b 627 run_cmd ${ns_b} ip addr add ${tunnel6_b_addr}/${tunnel6_mask} dev ${type}_b 628 629 run_cmd ${ns_a} ip link set ${type}_a up 630 run_cmd ${ns_b} ip link set ${type}_b up 631} 632 633setup_geneve4() { 634 setup_vxlan_or_geneve geneve ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1 "df set" 635} 636 637setup_vxlan4() { 638 setup_vxlan_or_geneve vxlan ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1 "df set" 639} 640 641setup_geneve6() { 642 setup_vxlan_or_geneve geneve ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 "" 643} 644 645setup_vxlan6() { 646 setup_vxlan_or_geneve vxlan ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 "" 647} 648 649setup_bridged_geneve4() { 650 setup_vxlan_or_geneve geneve ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1 "df set" "br0" 651} 652 653setup_bridged_vxlan4() { 654 setup_vxlan_or_geneve vxlan ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1 "df set" "br0" 655} 656 657setup_bridged_geneve6() { 658 setup_vxlan_or_geneve geneve ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 "" "br0" 659} 660 661setup_bridged_vxlan6() { 662 setup_vxlan_or_geneve vxlan ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 "" "br0" 663} 664 665setup_xfrm() { 666 proto=${1} 667 veth_a_addr="${2}" 668 veth_b_addr="${3}" 669 encap=${4} 670 671 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 1 672 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} 673 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 674 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 675 676 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} 677 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} 678 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 679 run_cmd ${ns_b} ip -${proto} xfrm policy add dir in mark 10 tmpl src ${veth_a_addr} dst ${veth_b_addr} proto esp mode tunnel 680} 681 682setup_nettest_xfrm() { 683 if ! which nettest >/dev/null; then 684 PATH=$PWD:$PATH 685 if ! which nettest >/dev/null; then 686 echo "'nettest' command not found; skipping tests" 687 return 1 688 fi 689 fi 690 691 [ ${1} -eq 6 ] && proto="-6" || proto="" 692 port=${2} 693 694 run_cmd_bg "${ns_a}" nettest "${proto}" -q -D -s -x -p "${port}" -t 5 695 nettest_pids="${nettest_pids} $!" 696 697 run_cmd_bg "${ns_b}" nettest "${proto}" -q -D -s -x -p "${port}" -t 5 698 nettest_pids="${nettest_pids} $!" 699} 700 701setup_xfrm4() { 702 setup_xfrm 4 ${veth4_a_addr} ${veth4_b_addr} 703} 704 705setup_xfrm6() { 706 setup_xfrm 6 ${veth6_a_addr} ${veth6_b_addr} 707} 708 709setup_xfrm4udp() { 710 setup_xfrm 4 ${veth4_a_addr} ${veth4_b_addr} "encap espinudp 4500 4500 0.0.0.0" 711 setup_nettest_xfrm 4 4500 712} 713 714setup_xfrm6udp() { 715 setup_xfrm 6 ${veth6_a_addr} ${veth6_b_addr} "encap espinudp 4500 4500 0.0.0.0" 716 setup_nettest_xfrm 6 4500 717} 718 719setup_xfrm4udprouted() { 720 setup_xfrm 4 ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1 "encap espinudp 4500 4500 0.0.0.0" 721 setup_nettest_xfrm 4 4500 722} 723 724setup_xfrm6udprouted() { 725 setup_xfrm 6 ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 "encap espinudp 4500 4500 0.0.0.0" 726 setup_nettest_xfrm 6 4500 727} 728 729setup_routing_old() { 730 for i in ${routes}; do 731 [ "${ns}" = "" ] && ns="${i}" && continue 732 [ "${addr}" = "" ] && addr="${i}" && continue 733 [ "${gw}" = "" ] && gw="${i}" 734 735 ns_name="$(nsname ${ns})" 736 737 ip -n "${ns_name}" route add "${addr}" table "${rt_table}" via "${gw}" 738 739 ns=""; addr=""; gw="" 740 done 741} 742 743setup_routing_new() { 744 for i in ${nexthops}; do 745 [ "${ns}" = "" ] && ns="${i}" && continue 746 [ "${fam}" = "" ] && fam="${i}" && continue 747 [ "${nhid}" = "" ] && nhid="${i}" && continue 748 [ "${gw}" = "" ] && gw="${i}" && continue 749 [ "${dev}" = "" ] && dev="${i}" 750 751 ns_name="$(nsname ${ns})" 752 753 ip -n ${ns_name} -${fam} nexthop add id ${nhid} via ${gw} dev ${dev} 754 755 ns=""; fam=""; nhid=""; gw=""; dev="" 756 757 done 758 759 for i in ${routes_nh}; do 760 [ "${ns}" = "" ] && ns="${i}" && continue 761 [ "${fam}" = "" ] && fam="${i}" && continue 762 [ "${addr}" = "" ] && addr="${i}" && continue 763 [ "${nhid}" = "" ] && nhid="${i}" 764 765 ns_name="$(nsname ${ns})" 766 767 ip -n "${ns_name}" -"${fam}" route add "${addr}" table "${rt_table}" nhid "${nhid}" 768 769 ns=""; fam=""; addr=""; nhid="" 770 done 771} 772 773setup_routing() { 774 for i in ${NS_R1} ${NS_R2}; do 775 ip netns exec ${i} sysctl -q net/ipv4/ip_forward=1 776 ip netns exec ${i} sysctl -q net/ipv6/conf/all/forwarding=1 777 done 778 779 for i in ${routing_addrs}; do 780 [ "${ns}" = "" ] && ns="${i}" && continue 781 [ "${peer}" = "" ] && peer="${i}" && continue 782 [ "${segment}" = "" ] && segment="${i}" 783 784 ns_name="$(nsname ${ns})" 785 peer_name="$(nsname ${peer})" 786 if="veth_${ns}-${peer}" 787 ifpeer="veth_${peer}-${ns}" 788 789 # Create veth links 790 ip link add ${if} up netns ${ns_name} type veth peer name ${ifpeer} netns ${peer_name} || return 1 791 ip -n ${peer_name} link set dev ${ifpeer} up 792 793 # Add addresses 794 ip -n ${ns_name} addr add ${prefix4}.${segment}.1/24 dev ${if} 795 ip -n ${ns_name} addr add ${prefix6}:${segment}::1/64 dev ${if} 796 797 ip -n ${peer_name} addr add ${prefix4}.${segment}.2/24 dev ${ifpeer} 798 ip -n ${peer_name} addr add ${prefix6}:${segment}::2/64 dev ${ifpeer} 799 800 ns=""; peer=""; segment="" 801 done 802 803 if [ "$USE_NH" = "yes" ]; then 804 setup_routing_new 805 else 806 setup_routing_old 807 fi 808 809 return 0 810} 811 812setup_policy_routing() { 813 setup_routing 814 815 ip -netns "${NS_A}" -4 rule add dsfield "${policy_mark}" \ 816 table "${rt_table}" 817 818 # Set the IPv4 Don't Fragment bit with tc, since socat doesn't seem to 819 # have an option do to it. 820 tc -netns "${NS_A}" qdisc replace dev veth_A-R1 root prio 821 tc -netns "${NS_A}" qdisc replace dev veth_A-R2 root prio 822 tc -netns "${NS_A}" filter add dev veth_A-R1 \ 823 protocol ipv4 flower ip_proto udp \ 824 action pedit ex munge ip df set 0x40 pipe csum ip and udp 825 tc -netns "${NS_A}" filter add dev veth_A-R2 \ 826 protocol ipv4 flower ip_proto udp \ 827 action pedit ex munge ip df set 0x40 pipe csum ip and udp 828} 829 830setup_bridge() { 831 run_cmd ${ns_a} ip link add br0 type bridge || return $ksft_skip 832 run_cmd ${ns_a} ip link set br0 up 833 834 run_cmd ${ns_c} ip link add veth_C-A type veth peer name veth_A-C 835 run_cmd ${ns_c} ip link set veth_A-C netns ${NS_A} 836 837 run_cmd ${ns_a} ip link set veth_A-C up 838 run_cmd ${ns_c} ip link set veth_C-A up 839 run_cmd ${ns_c} ip addr add ${veth4_c_addr}/${veth4_mask} dev veth_C-A 840 run_cmd ${ns_c} ip addr add ${veth6_c_addr}/${veth6_mask} dev veth_C-A 841 run_cmd ${ns_a} ip link set veth_A-C master br0 842} 843 844setup_ovs_vxlan_or_geneve() { 845 type="${1}" 846 a_addr="${2}" 847 b_addr="${3}" 848 849 if [ "${type}" = "vxlan" ]; then 850 opts="${opts} ttl 64 dstport 4789" 851 opts_b="local ${b_addr}" 852 fi 853 854 run_cmd ovs-vsctl add-port ovs_br0 ${type}_a -- \ 855 set interface ${type}_a type=${type} \ 856 options:remote_ip=${b_addr} options:key=1 options:csum=true || return 1 857 858 run_cmd ${ns_b} ip link add ${type}_b type ${type} id 1 ${opts_b} remote ${a_addr} ${opts} || return 1 859 860 run_cmd ${ns_b} ip addr add ${tunnel4_b_addr}/${tunnel4_mask} dev ${type}_b 861 run_cmd ${ns_b} ip addr add ${tunnel6_b_addr}/${tunnel6_mask} dev ${type}_b 862 863 run_cmd ${ns_b} ip link set ${type}_b up 864} 865 866setup_ovs_geneve4() { 867 setup_ovs_vxlan_or_geneve geneve ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1 868} 869 870setup_ovs_vxlan4() { 871 setup_ovs_vxlan_or_geneve vxlan ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1 872} 873 874setup_ovs_geneve6() { 875 setup_ovs_vxlan_or_geneve geneve ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 876} 877 878setup_ovs_vxlan6() { 879 setup_ovs_vxlan_or_geneve vxlan ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 880} 881 882setup_ovs_bridge() { 883 run_cmd ovs-vsctl add-br ovs_br0 || return $ksft_skip 884 run_cmd ip link set ovs_br0 up 885 886 run_cmd ${ns_c} ip link add veth_C-A type veth peer name veth_A-C 887 run_cmd ${ns_c} ip link set veth_A-C netns 1 888 889 run_cmd ip link set veth_A-C up 890 run_cmd ${ns_c} ip link set veth_C-A up 891 run_cmd ${ns_c} ip addr add ${veth4_c_addr}/${veth4_mask} dev veth_C-A 892 run_cmd ${ns_c} ip addr add ${veth6_c_addr}/${veth6_mask} dev veth_C-A 893 run_cmd ovs-vsctl add-port ovs_br0 veth_A-C 894 895 # Move veth_A-R1 to init 896 run_cmd ${ns_a} ip link set veth_A-R1 netns 1 897 run_cmd ip addr add ${prefix4}.${a_r1}.1/${veth4_mask} dev veth_A-R1 898 run_cmd ip addr add ${prefix6}:${a_r1}::1/${veth6_mask} dev veth_A-R1 899 run_cmd ip link set veth_A-R1 up 900 run_cmd ip route add ${prefix4}.${b_r1}.1 via ${prefix4}.${a_r1}.2 901 run_cmd ip route add ${prefix6}:${b_r1}::1 via ${prefix6}:${a_r1}::2 902} 903 904setup() { 905 [ "$(id -u)" -ne 0 ] && echo " need to run as root" && return $ksft_skip 906 907 for arg do 908 eval setup_${arg} || { echo " ${arg} not supported"; return 1; } 909 done 910} 911 912trace() { 913 [ $TRACING -eq 0 ] && return 914 915 for arg do 916 [ "${ns_cmd}" = "" ] && ns_cmd="${arg}" && continue 917 ${ns_cmd} tcpdump --immediate-mode -s 0 -i "${arg}" -w "${name}_${arg}.pcap" 2> /dev/null & 918 tcpdump_pids="${tcpdump_pids} $!" 919 ns_cmd= 920 done 921 sleep 1 922} 923 924cleanup() { 925 for pid in ${tcpdump_pids}; do 926 kill ${pid} 927 done 928 tcpdump_pids= 929 930 for pid in ${nettest_pids}; do 931 kill ${pid} 932 done 933 nettest_pids= 934 935 for pid in ${socat_pids}; do 936 kill "${pid}" 937 done 938 socat_pids= 939 940 cleanup_all_ns 941 942 ip link del veth_A-C 2>/dev/null 943 ip link del veth_A-R1 2>/dev/null 944 ovs-vsctl --if-exists del-port vxlan_a 2>/dev/null 945 ovs-vsctl --if-exists del-br ovs_br0 2>/dev/null 946 rm -f "$tmpoutfile" 947} 948 949mtu() { 950 ns_cmd="${1}" 951 dev="${2}" 952 mtu="${3}" 953 954 ${ns_cmd} ip link set dev ${dev} mtu ${mtu} 955} 956 957mtu_parse() { 958 input="${1}" 959 960 next=0 961 for i in ${input}; do 962 [ ${next} -eq 1 -a "${i}" = "lock" ] && next=2 && continue 963 [ ${next} -eq 1 ] && echo "${i}" && return 964 [ ${next} -eq 2 ] && echo "lock ${i}" && return 965 [ "${i}" = "mtu" ] && next=1 966 done 967} 968 969link_get() { 970 ns_cmd="${1}" 971 name="${2}" 972 973 ${ns_cmd} ip link show dev "${name}" 974} 975 976link_get_mtu() { 977 ns_cmd="${1}" 978 name="${2}" 979 980 mtu_parse "$(link_get "${ns_cmd}" ${name})" 981} 982 983route_get_dst_exception() { 984 ns_cmd="${1}" 985 dst="${2}" 986 dsfield="${3}" 987 988 if [ -z "${dsfield}" ]; then 989 dsfield=0 990 fi 991 992 ${ns_cmd} ip route get "${dst}" dsfield "${dsfield}" 993} 994 995route_get_dst_pmtu_from_exception() { 996 ns_cmd="${1}" 997 dst="${2}" 998 dsfield="${3}" 999 1000 mtu_parse "$(route_get_dst_exception "${ns_cmd}" "${dst}" "${dsfield}")" 1001} 1002 1003check_pmtu_value() { 1004 expected="${1}" 1005 value="${2}" 1006 event="${3}" 1007 1008 [ "${expected}" = "any" ] && [ -n "${value}" ] && return 0 1009 [ "${value}" = "${expected}" ] && return 0 1010 [ -z "${value}" ] && err " PMTU exception wasn't created after ${event}" && return 1 1011 [ -z "${expected}" ] && err " PMTU exception shouldn't exist after ${event}" && return 1 1012 err " found PMTU exception with incorrect MTU ${value}, expected ${expected}, after ${event}" 1013 return 1 1014} 1015 1016test_pmtu_ipvX() { 1017 family=${1} 1018 1019 setup namespaces routing || return $ksft_skip 1020 trace "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \ 1021 "${ns_r1}" veth_R1-B "${ns_b}" veth_B-R1 \ 1022 "${ns_a}" veth_A-R2 "${ns_r2}" veth_R2-A \ 1023 "${ns_r2}" veth_R2-B "${ns_b}" veth_B-R2 1024 1025 if [ ${family} -eq 4 ]; then 1026 ping=ping 1027 dst1="${prefix4}.${b_r1}.1" 1028 dst2="${prefix4}.${b_r2}.1" 1029 else 1030 ping=${ping6} 1031 dst1="${prefix6}:${b_r1}::1" 1032 dst2="${prefix6}:${b_r2}::1" 1033 fi 1034 1035 # Set up initial MTU values 1036 mtu "${ns_a}" veth_A-R1 2000 1037 mtu "${ns_r1}" veth_R1-A 2000 1038 mtu "${ns_r1}" veth_R1-B 1400 1039 mtu "${ns_b}" veth_B-R1 1400 1040 1041 mtu "${ns_a}" veth_A-R2 2000 1042 mtu "${ns_r2}" veth_R2-A 2000 1043 mtu "${ns_r2}" veth_R2-B 1500 1044 mtu "${ns_b}" veth_B-R2 1500 1045 1046 # Create route exceptions 1047 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1800 ${dst1} 1048 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1800 ${dst2} 1049 1050 # Check that exceptions have been created with the correct PMTU 1051 pmtu_1="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst1})" 1052 check_pmtu_value "1400" "${pmtu_1}" "exceeding MTU" || return 1 1053 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})" 1054 check_pmtu_value "1500" "${pmtu_2}" "exceeding MTU" || return 1 1055 1056 # Decrease local MTU below PMTU, check for PMTU decrease in route exception 1057 mtu "${ns_a}" veth_A-R1 1300 1058 mtu "${ns_r1}" veth_R1-A 1300 1059 pmtu_1="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst1})" 1060 check_pmtu_value "1300" "${pmtu_1}" "decreasing local MTU" || return 1 1061 # Second exception shouldn't be modified 1062 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})" 1063 check_pmtu_value "1500" "${pmtu_2}" "changing local MTU on a link not on this path" || return 1 1064 1065 # Increase MTU, check for PMTU increase in route exception 1066 mtu "${ns_a}" veth_A-R1 1700 1067 mtu "${ns_r1}" veth_R1-A 1700 1068 pmtu_1="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst1})" 1069 check_pmtu_value "1700" "${pmtu_1}" "increasing local MTU" || return 1 1070 # Second exception shouldn't be modified 1071 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})" 1072 check_pmtu_value "1500" "${pmtu_2}" "changing local MTU on a link not on this path" || return 1 1073 1074 # Skip PMTU locking tests for IPv6 1075 [ $family -eq 6 ] && return 0 1076 1077 # Decrease remote MTU on path via R2, get new exception 1078 mtu "${ns_r2}" veth_R2-B 400 1079 mtu "${ns_b}" veth_B-R2 400 1080 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1400 ${dst2} 1081 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})" 1082 check_pmtu_value "lock 552" "${pmtu_2}" "exceeding MTU, with MTU < min_pmtu" || return 1 1083 1084 # Decrease local MTU below PMTU 1085 mtu "${ns_a}" veth_A-R2 500 1086 mtu "${ns_r2}" veth_R2-A 500 1087 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})" 1088 check_pmtu_value "500" "${pmtu_2}" "decreasing local MTU" || return 1 1089 1090 # Increase local MTU 1091 mtu "${ns_a}" veth_A-R2 1500 1092 mtu "${ns_r2}" veth_R2-A 1500 1093 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})" 1094 check_pmtu_value "1500" "${pmtu_2}" "increasing local MTU" || return 1 1095 1096 # Get new exception 1097 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1400 ${dst2} 1098 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})" 1099 check_pmtu_value "lock 552" "${pmtu_2}" "exceeding MTU, with MTU < min_pmtu" || return 1 1100} 1101 1102test_pmtu_ipv4_exception() { 1103 test_pmtu_ipvX 4 1104} 1105 1106test_pmtu_ipv6_exception() { 1107 test_pmtu_ipvX 6 1108} 1109 1110test_pmtu_ipv4_dscp_icmp_exception() { 1111 rt_table=100 1112 1113 setup namespaces policy_routing || return $ksft_skip 1114 trace "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \ 1115 "${ns_r1}" veth_R1-B "${ns_b}" veth_B-R1 \ 1116 "${ns_a}" veth_A-R2 "${ns_r2}" veth_R2-A \ 1117 "${ns_r2}" veth_R2-B "${ns_b}" veth_B-R2 1118 1119 # Set up initial MTU values 1120 mtu "${ns_a}" veth_A-R1 2000 1121 mtu "${ns_r1}" veth_R1-A 2000 1122 mtu "${ns_r1}" veth_R1-B 1400 1123 mtu "${ns_b}" veth_B-R1 1400 1124 1125 mtu "${ns_a}" veth_A-R2 2000 1126 mtu "${ns_r2}" veth_R2-A 2000 1127 mtu "${ns_r2}" veth_R2-B 1500 1128 mtu "${ns_b}" veth_B-R2 1500 1129 1130 len=$((2000 - 20 - 8)) # Fills MTU of veth_A-R1 1131 1132 dst1="${prefix4}.${b_r1}.1" 1133 dst2="${prefix4}.${b_r2}.1" 1134 1135 # Create route exceptions 1136 dsfield=${policy_mark} # No ECN bit set (Not-ECT) 1137 run_cmd "${ns_a}" ping -q -M want -Q "${dsfield}" -c 1 -w 1 -s "${len}" "${dst1}" 1138 1139 dsfield=$(printf "%#x" $((policy_mark + 0x02))) # ECN=2 (ECT(0)) 1140 run_cmd "${ns_a}" ping -q -M want -Q "${dsfield}" -c 1 -w 1 -s "${len}" "${dst2}" 1141 1142 # Check that exceptions have been created with the correct PMTU 1143 pmtu_1="$(route_get_dst_pmtu_from_exception "${ns_a}" "${dst1}" "${policy_mark}")" 1144 check_pmtu_value "1400" "${pmtu_1}" "exceeding MTU" || return 1 1145 1146 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" "${dst2}" "${policy_mark}")" 1147 check_pmtu_value "1500" "${pmtu_2}" "exceeding MTU" || return 1 1148} 1149 1150test_pmtu_ipv4_dscp_udp_exception() { 1151 rt_table=100 1152 1153 if ! which socat > /dev/null 2>&1; then 1154 echo "'socat' command not found; skipping tests" 1155 return $ksft_skip 1156 fi 1157 1158 setup namespaces policy_routing || return $ksft_skip 1159 trace "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \ 1160 "${ns_r1}" veth_R1-B "${ns_b}" veth_B-R1 \ 1161 "${ns_a}" veth_A-R2 "${ns_r2}" veth_R2-A \ 1162 "${ns_r2}" veth_R2-B "${ns_b}" veth_B-R2 1163 1164 # Set up initial MTU values 1165 mtu "${ns_a}" veth_A-R1 2000 1166 mtu "${ns_r1}" veth_R1-A 2000 1167 mtu "${ns_r1}" veth_R1-B 1400 1168 mtu "${ns_b}" veth_B-R1 1400 1169 1170 mtu "${ns_a}" veth_A-R2 2000 1171 mtu "${ns_r2}" veth_R2-A 2000 1172 mtu "${ns_r2}" veth_R2-B 1500 1173 mtu "${ns_b}" veth_B-R2 1500 1174 1175 len=$((2000 - 20 - 8)) # Fills MTU of veth_A-R1 1176 1177 dst1="${prefix4}.${b_r1}.1" 1178 dst2="${prefix4}.${b_r2}.1" 1179 1180 # Create route exceptions 1181 run_cmd_bg "${ns_b}" socat UDP-LISTEN:50000 OPEN:/dev/null,wronly=1 1182 socat_pids="${socat_pids} $!" 1183 1184 dsfield=${policy_mark} # No ECN bit set (Not-ECT) 1185 run_cmd "${ns_a}" socat OPEN:/dev/zero,rdonly=1,readbytes="${len}" \ 1186 UDP:"${dst1}":50000,tos="${dsfield}" 1187 1188 dsfield=$(printf "%#x" $((policy_mark + 0x02))) # ECN=2 (ECT(0)) 1189 run_cmd "${ns_a}" socat OPEN:/dev/zero,rdonly=1,readbytes="${len}" \ 1190 UDP:"${dst2}":50000,tos="${dsfield}" 1191 1192 # Check that exceptions have been created with the correct PMTU 1193 pmtu_1="$(route_get_dst_pmtu_from_exception "${ns_a}" "${dst1}" "${policy_mark}")" 1194 check_pmtu_value "1400" "${pmtu_1}" "exceeding MTU" || return 1 1195 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" "${dst2}" "${policy_mark}")" 1196 check_pmtu_value "1500" "${pmtu_2}" "exceeding MTU" || return 1 1197} 1198 1199test_pmtu_ipvX_over_vxlanY_or_geneveY_exception() { 1200 type=${1} 1201 family=${2} 1202 outer_family=${3} 1203 ll_mtu=4000 1204 1205 if [ ${outer_family} -eq 4 ]; then 1206 setup namespaces routing ${type}4 || return $ksft_skip 1207 # IPv4 header UDP header VXLAN/GENEVE header Ethernet header 1208 exp_mtu=$((${ll_mtu} - 20 - 8 - 8 - 14)) 1209 else 1210 setup namespaces routing ${type}6 || return $ksft_skip 1211 # IPv6 header UDP header VXLAN/GENEVE header Ethernet header 1212 exp_mtu=$((${ll_mtu} - 40 - 8 - 8 - 14)) 1213 fi 1214 1215 trace "${ns_a}" ${type}_a "${ns_b}" ${type}_b \ 1216 "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \ 1217 "${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B 1218 1219 if [ ${family} -eq 4 ]; then 1220 ping=ping 1221 dst=${tunnel4_b_addr} 1222 else 1223 ping=${ping6} 1224 dst=${tunnel6_b_addr} 1225 fi 1226 1227 # Create route exception by exceeding link layer MTU 1228 mtu "${ns_a}" veth_A-R1 $((${ll_mtu} + 1000)) 1229 mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000)) 1230 mtu "${ns_b}" veth_B-R1 ${ll_mtu} 1231 mtu "${ns_r1}" veth_R1-B ${ll_mtu} 1232 1233 mtu "${ns_a}" ${type}_a $((${ll_mtu} + 1000)) 1234 mtu "${ns_b}" ${type}_b $((${ll_mtu} + 1000)) 1235 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${dst} 1236 1237 # Check that exception was created 1238 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst})" 1239 check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on ${type} interface" 1240} 1241 1242test_pmtu_ipv4_vxlan4_exception() { 1243 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception vxlan 4 4 1244} 1245 1246test_pmtu_ipv6_vxlan4_exception() { 1247 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception vxlan 6 4 1248} 1249 1250test_pmtu_ipv4_geneve4_exception() { 1251 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception geneve 4 4 1252} 1253 1254test_pmtu_ipv6_geneve4_exception() { 1255 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception geneve 6 4 1256} 1257 1258test_pmtu_ipv4_vxlan6_exception() { 1259 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception vxlan 4 6 1260} 1261 1262test_pmtu_ipv6_vxlan6_exception() { 1263 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception vxlan 6 6 1264} 1265 1266test_pmtu_ipv4_geneve6_exception() { 1267 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception geneve 4 6 1268} 1269 1270test_pmtu_ipv6_geneve6_exception() { 1271 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception geneve 6 6 1272} 1273 1274test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception() { 1275 type=${1} 1276 family=${2} 1277 outer_family=${3} 1278 ll_mtu=4000 1279 1280 if [ ${outer_family} -eq 4 ]; then 1281 setup namespaces routing bridge bridged_${type}4 || return $ksft_skip 1282 # IPv4 header UDP header VXLAN/GENEVE header Ethernet header 1283 exp_mtu=$((${ll_mtu} - 20 - 8 - 8 - 14)) 1284 else 1285 setup namespaces routing bridge bridged_${type}6 || return $ksft_skip 1286 # IPv6 header UDP header VXLAN/GENEVE header Ethernet header 1287 exp_mtu=$((${ll_mtu} - 40 - 8 - 8 - 14)) 1288 fi 1289 1290 trace "${ns_a}" ${type}_a "${ns_b}" ${type}_b \ 1291 "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \ 1292 "${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B \ 1293 "${ns_a}" br0 "${ns_a}" veth-A-C \ 1294 "${ns_c}" veth_C-A 1295 1296 if [ ${family} -eq 4 ]; then 1297 ping=ping 1298 dst=${tunnel4_b_addr} 1299 else 1300 ping=${ping6} 1301 dst=${tunnel6_b_addr} 1302 fi 1303 1304 # Create route exception by exceeding link layer MTU 1305 mtu "${ns_a}" veth_A-R1 $((${ll_mtu} + 1000)) 1306 mtu "${ns_a}" br0 $((${ll_mtu} + 1000)) 1307 mtu "${ns_a}" veth_A-C $((${ll_mtu} + 1000)) 1308 mtu "${ns_c}" veth_C-A $((${ll_mtu} + 1000)) 1309 mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000)) 1310 mtu "${ns_b}" veth_B-R1 ${ll_mtu} 1311 mtu "${ns_r1}" veth_R1-B ${ll_mtu} 1312 1313 mtu "${ns_a}" ${type}_a $((${ll_mtu} + 1000)) 1314 mtu "${ns_b}" ${type}_b $((${ll_mtu} + 1000)) 1315 1316 run_cmd ${ns_c} ${ping} -q -M want -i 0.1 -c 10 -s $((${ll_mtu} + 500)) ${dst} || return 1 1317 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${dst} || return 1 1318 1319 # Check that exceptions were created 1320 pmtu="$(route_get_dst_pmtu_from_exception "${ns_c}" ${dst})" 1321 check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on bridged ${type} interface" 1322 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst})" 1323 check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on locally bridged ${type} interface" 1324 1325 tmpoutfile=$(mktemp) 1326 1327 # Flush Exceptions, retry with TCP 1328 run_cmd ${ns_a} ip route flush cached ${dst} 1329 run_cmd ${ns_b} ip route flush cached ${dst} 1330 run_cmd ${ns_c} ip route flush cached ${dst} 1331 1332 for target in "${ns_a}" "${ns_c}" ; do 1333 if [ ${family} -eq 4 ]; then 1334 TCPDST=TCP:${dst}:50000 1335 else 1336 TCPDST="TCP:[${dst}]:50000" 1337 fi 1338 ${ns_b} socat -T 3 -u -6 TCP-LISTEN:50000 STDOUT > $tmpoutfile & 1339 1340 sleep 1 1341 1342 dd if=/dev/zero of=/dev/stdout status=none bs=1M count=1 | ${target} socat -T 3 -u STDIN $TCPDST,connect-timeout=3 1343 1344 size=$(du -sb $tmpoutfile) 1345 size=${size%%/tmp/*} 1346 1347 [ $size -ne 1048576 ] && err "File size $size mismatches exepcted value in locally bridged vxlan test" && return 1 1348 done 1349 1350 rm -f "$tmpoutfile" 1351 1352 # Check that exceptions were created 1353 pmtu="$(route_get_dst_pmtu_from_exception "${ns_c}" ${dst})" 1354 check_pmtu_value ${exp_mtu} "${pmtu}" "tcp: exceeding link layer MTU on bridged ${type} interface" 1355 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst})" 1356 check_pmtu_value ${exp_mtu} "${pmtu}" "tcp exceeding link layer MTU on locally bridged ${type} interface" 1357} 1358 1359test_pmtu_ipv4_br_vxlan4_exception() { 1360 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception vxlan 4 4 1361} 1362 1363test_pmtu_ipv6_br_vxlan4_exception() { 1364 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception vxlan 6 4 1365} 1366 1367test_pmtu_ipv4_br_geneve4_exception() { 1368 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception geneve 4 4 1369} 1370 1371test_pmtu_ipv6_br_geneve4_exception() { 1372 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception geneve 6 4 1373} 1374 1375test_pmtu_ipv4_br_vxlan6_exception() { 1376 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception vxlan 4 6 1377} 1378 1379test_pmtu_ipv6_br_vxlan6_exception() { 1380 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception vxlan 6 6 1381} 1382 1383test_pmtu_ipv4_br_geneve6_exception() { 1384 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception geneve 4 6 1385} 1386 1387test_pmtu_ipv6_br_geneve6_exception() { 1388 test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception geneve 6 6 1389} 1390 1391test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception() { 1392 type=${1} 1393 family=${2} 1394 outer_family=${3} 1395 ll_mtu=4000 1396 1397 if [ ${outer_family} -eq 4 ]; then 1398 setup namespaces routing ovs_bridge ovs_${type}4 || return $ksft_skip 1399 # IPv4 header UDP header VXLAN/GENEVE header Ethernet header 1400 exp_mtu=$((${ll_mtu} - 20 - 8 - 8 - 14)) 1401 else 1402 setup namespaces routing ovs_bridge ovs_${type}6 || return $ksft_skip 1403 # IPv6 header UDP header VXLAN/GENEVE header Ethernet header 1404 exp_mtu=$((${ll_mtu} - 40 - 8 - 8 - 14)) 1405 fi 1406 1407 if [ "${type}" = "vxlan" ]; then 1408 tun_a="vxlan_sys_4789" 1409 elif [ "${type}" = "geneve" ]; then 1410 tun_a="genev_sys_6081" 1411 fi 1412 1413 trace "" "${tun_a}" "${ns_b}" ${type}_b \ 1414 "" veth_A-R1 "${ns_r1}" veth_R1-A \ 1415 "${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B \ 1416 "" ovs_br0 "" veth-A-C \ 1417 "${ns_c}" veth_C-A 1418 1419 if [ ${family} -eq 4 ]; then 1420 ping=ping 1421 dst=${tunnel4_b_addr} 1422 else 1423 ping=${ping6} 1424 dst=${tunnel6_b_addr} 1425 fi 1426 1427 # Create route exception by exceeding link layer MTU 1428 mtu "" veth_A-R1 $((${ll_mtu} + 1000)) 1429 mtu "" ovs_br0 $((${ll_mtu} + 1000)) 1430 mtu "" veth_A-C $((${ll_mtu} + 1000)) 1431 mtu "${ns_c}" veth_C-A $((${ll_mtu} + 1000)) 1432 mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000)) 1433 mtu "${ns_b}" veth_B-R1 ${ll_mtu} 1434 mtu "${ns_r1}" veth_R1-B ${ll_mtu} 1435 1436 mtu "" ${tun_a} $((${ll_mtu} + 1000)) 1437 mtu "${ns_b}" ${type}_b $((${ll_mtu} + 1000)) 1438 1439 run_cmd ${ns_c} ${ping} -q -M want -i 0.1 -c 20 -s $((${ll_mtu} + 500)) ${dst} || return 1 1440 1441 # Check that exceptions were created 1442 pmtu="$(route_get_dst_pmtu_from_exception "${ns_c}" ${dst})" 1443 check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on Open vSwitch ${type} interface" 1444} 1445 1446test_pmtu_ipv4_ovs_vxlan4_exception() { 1447 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception vxlan 4 4 1448} 1449 1450test_pmtu_ipv6_ovs_vxlan4_exception() { 1451 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception vxlan 6 4 1452} 1453 1454test_pmtu_ipv4_ovs_geneve4_exception() { 1455 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception geneve 4 4 1456} 1457 1458test_pmtu_ipv6_ovs_geneve4_exception() { 1459 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception geneve 6 4 1460} 1461 1462test_pmtu_ipv4_ovs_vxlan6_exception() { 1463 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception vxlan 4 6 1464} 1465 1466test_pmtu_ipv6_ovs_vxlan6_exception() { 1467 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception vxlan 6 6 1468} 1469 1470test_pmtu_ipv4_ovs_geneve6_exception() { 1471 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception geneve 4 6 1472} 1473 1474test_pmtu_ipv6_ovs_geneve6_exception() { 1475 test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception geneve 6 6 1476} 1477 1478test_pmtu_ipvX_over_fouY_or_gueY() { 1479 inner_family=${1} 1480 outer_family=${2} 1481 encap=${3} 1482 ll_mtu=4000 1483 1484 setup namespaces routing ${encap}${outer_family}${inner_family} || return $ksft_skip 1485 trace "${ns_a}" ${encap}_a "${ns_b}" ${encap}_b \ 1486 "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \ 1487 "${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B 1488 1489 if [ ${inner_family} -eq 4 ]; then 1490 ping=ping 1491 dst=${tunnel4_b_addr} 1492 else 1493 ping=${ping6} 1494 dst=${tunnel6_b_addr} 1495 fi 1496 1497 if [ "${encap}" = "gue" ]; then 1498 encap_overhead=4 1499 else 1500 encap_overhead=0 1501 fi 1502 1503 if [ ${outer_family} -eq 4 ]; then 1504 # IPv4 header UDP header 1505 exp_mtu=$((${ll_mtu} - 20 - 8 - ${encap_overhead})) 1506 else 1507 # IPv6 header Option 4 UDP header 1508 exp_mtu=$((${ll_mtu} - 40 - 8 - 8 - ${encap_overhead})) 1509 fi 1510 1511 # Create route exception by exceeding link layer MTU 1512 mtu "${ns_a}" veth_A-R1 $((${ll_mtu} + 1000)) 1513 mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000)) 1514 mtu "${ns_b}" veth_B-R1 ${ll_mtu} 1515 mtu "${ns_r1}" veth_R1-B ${ll_mtu} 1516 1517 mtu "${ns_a}" ${encap}_a $((${ll_mtu} + 1000)) 1518 mtu "${ns_b}" ${encap}_b $((${ll_mtu} + 1000)) 1519 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${dst} 1520 1521 # Check that exception was created 1522 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst})" 1523 check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on ${encap} interface" 1524} 1525 1526test_pmtu_ipv4_fou4_exception() { 1527 test_pmtu_ipvX_over_fouY_or_gueY 4 4 fou 1528} 1529 1530test_pmtu_ipv6_fou4_exception() { 1531 test_pmtu_ipvX_over_fouY_or_gueY 6 4 fou 1532} 1533 1534test_pmtu_ipv4_fou6_exception() { 1535 test_pmtu_ipvX_over_fouY_or_gueY 4 6 fou 1536} 1537 1538test_pmtu_ipv6_fou6_exception() { 1539 test_pmtu_ipvX_over_fouY_or_gueY 6 6 fou 1540} 1541 1542test_pmtu_ipv4_gue4_exception() { 1543 test_pmtu_ipvX_over_fouY_or_gueY 4 4 gue 1544} 1545 1546test_pmtu_ipv6_gue4_exception() { 1547 test_pmtu_ipvX_over_fouY_or_gueY 6 4 gue 1548} 1549 1550test_pmtu_ipv4_gue6_exception() { 1551 test_pmtu_ipvX_over_fouY_or_gueY 4 6 gue 1552} 1553 1554test_pmtu_ipv6_gue6_exception() { 1555 test_pmtu_ipvX_over_fouY_or_gueY 6 6 gue 1556} 1557 1558test_pmtu_ipvX_over_ipvY_exception() { 1559 inner=${1} 1560 outer=${2} 1561 ll_mtu=4000 1562 1563 setup namespaces routing ip${inner}ip${outer} || return $ksft_skip 1564 1565 trace "${ns_a}" ip_a "${ns_b}" ip_b \ 1566 "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \ 1567 "${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B 1568 1569 if [ ${inner} -eq 4 ]; then 1570 ping=ping 1571 dst=${tunnel4_b_addr} 1572 else 1573 ping=${ping6} 1574 dst=${tunnel6_b_addr} 1575 fi 1576 1577 if [ ${outer} -eq 4 ]; then 1578 # IPv4 header 1579 exp_mtu=$((${ll_mtu} - 20)) 1580 else 1581 # IPv6 header Option 4 1582 exp_mtu=$((${ll_mtu} - 40 - 8)) 1583 fi 1584 1585 # Create route exception by exceeding link layer MTU 1586 mtu "${ns_a}" veth_A-R1 $((${ll_mtu} + 1000)) 1587 mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000)) 1588 mtu "${ns_b}" veth_B-R1 ${ll_mtu} 1589 mtu "${ns_r1}" veth_R1-B ${ll_mtu} 1590 1591 mtu "${ns_a}" ip_a $((${ll_mtu} + 1000)) || return 1592 mtu "${ns_b}" ip_b $((${ll_mtu} + 1000)) || return 1593 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${dst} 1594 1595 # Check that exception was created 1596 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst})" 1597 check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on ip${inner}ip${outer} interface" 1598} 1599 1600test_pmtu_ipv4_ipv4_exception() { 1601 test_pmtu_ipvX_over_ipvY_exception 4 4 1602} 1603 1604test_pmtu_ipv6_ipv4_exception() { 1605 test_pmtu_ipvX_over_ipvY_exception 6 4 1606} 1607 1608test_pmtu_ipv4_ipv6_exception() { 1609 test_pmtu_ipvX_over_ipvY_exception 4 6 1610} 1611 1612test_pmtu_ipv6_ipv6_exception() { 1613 test_pmtu_ipvX_over_ipvY_exception 6 6 1614} 1615 1616test_pmtu_vti4_exception() { 1617 setup namespaces veth vti4 xfrm4 || return $ksft_skip 1618 trace "${ns_a}" veth_a "${ns_b}" veth_b \ 1619 "${ns_a}" vti4_a "${ns_b}" vti4_b 1620 1621 veth_mtu=1500 1622 vti_mtu=$((veth_mtu - 20)) 1623 1624 # SPI SN IV ICV pad length next header 1625 esp_payload_rfc4106=$((vti_mtu - 4 - 4 - 8 - 16 - 1 - 1)) 1626 ping_payload=$((esp_payload_rfc4106 - 28)) 1627 1628 mtu "${ns_a}" veth_a ${veth_mtu} 1629 mtu "${ns_b}" veth_b ${veth_mtu} 1630 mtu "${ns_a}" vti4_a ${vti_mtu} 1631 mtu "${ns_b}" vti4_b ${vti_mtu} 1632 1633 # Send DF packet without exceeding link layer MTU, check that no 1634 # exception is created 1635 run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s ${ping_payload} ${tunnel4_b_addr} 1636 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel4_b_addr})" 1637 check_pmtu_value "" "${pmtu}" "sending packet smaller than PMTU (IP payload length ${esp_payload_rfc4106})" || return 1 1638 1639 # Now exceed link layer MTU by one byte, check that exception is created 1640 # with the right PMTU value 1641 run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s $((ping_payload + 1)) ${tunnel4_b_addr} 1642 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel4_b_addr})" 1643 check_pmtu_value "${esp_payload_rfc4106}" "${pmtu}" "exceeding PMTU (IP payload length $((esp_payload_rfc4106 + 1)))" 1644} 1645 1646test_pmtu_vti6_exception() { 1647 setup namespaces veth vti6 xfrm6 || return $ksft_skip 1648 trace "${ns_a}" veth_a "${ns_b}" veth_b \ 1649 "${ns_a}" vti6_a "${ns_b}" vti6_b 1650 fail=0 1651 1652 # Create route exception by exceeding link layer MTU 1653 mtu "${ns_a}" veth_a 4000 1654 mtu "${ns_b}" veth_b 4000 1655 mtu "${ns_a}" vti6_a 5000 1656 mtu "${ns_b}" vti6_b 5000 1657 run_cmd ${ns_a} ${ping6} -q -i 0.1 -w 1 -s 60000 ${tunnel6_b_addr} 1658 1659 # Check that exception was created 1660 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})" 1661 check_pmtu_value any "${pmtu}" "creating tunnel exceeding link layer MTU" || return 1 1662 1663 # Decrease tunnel MTU, check for PMTU decrease in route exception 1664 mtu "${ns_a}" vti6_a 3000 1665 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})" 1666 check_pmtu_value "3000" "${pmtu}" "decreasing tunnel MTU" || fail=1 1667 1668 # Increase tunnel MTU, check for PMTU increase in route exception 1669 mtu "${ns_a}" vti6_a 9000 1670 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})" 1671 check_pmtu_value "9000" "${pmtu}" "increasing tunnel MTU" || fail=1 1672 1673 return ${fail} 1674} 1675 1676test_pmtu_vti4_udp_exception() { 1677 setup namespaces veth vti4 xfrm4udp || return $ksft_skip 1678 trace "${ns_a}" veth_a "${ns_b}" veth_b \ 1679 "${ns_a}" vti4_a "${ns_b}" vti4_b 1680 1681 veth_mtu=1500 1682 vti_mtu=$((veth_mtu - 20)) 1683 1684 # UDP SPI SN IV ICV pad length next header 1685 esp_payload_rfc4106=$((vti_mtu - 8 - 4 - 4 - 8 - 16 - 1 - 1)) 1686 ping_payload=$((esp_payload_rfc4106 - 28)) 1687 1688 mtu "${ns_a}" veth_a ${veth_mtu} 1689 mtu "${ns_b}" veth_b ${veth_mtu} 1690 mtu "${ns_a}" vti4_a ${vti_mtu} 1691 mtu "${ns_b}" vti4_b ${vti_mtu} 1692 1693 # Send DF packet without exceeding link layer MTU, check that no 1694 # exception is created 1695 run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s ${ping_payload} ${tunnel4_b_addr} 1696 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel4_b_addr})" 1697 check_pmtu_value "" "${pmtu}" "sending packet smaller than PMTU (IP payload length ${esp_payload_rfc4106})" || return 1 1698 1699 # Now exceed link layer MTU by one byte, check that exception is created 1700 # with the right PMTU value 1701 run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s $((ping_payload + 1)) ${tunnel4_b_addr} 1702 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel4_b_addr})" 1703 check_pmtu_value "${esp_payload_rfc4106}" "${pmtu}" "exceeding PMTU (IP payload length $((esp_payload_rfc4106 + 1)))" 1704} 1705 1706test_pmtu_vti6_udp_exception() { 1707 setup namespaces veth vti6 xfrm6udp || return $ksft_skip 1708 trace "${ns_a}" veth_a "${ns_b}" veth_b \ 1709 "${ns_a}" vti6_a "${ns_b}" vti6_b 1710 fail=0 1711 1712 # Create route exception by exceeding link layer MTU 1713 mtu "${ns_a}" veth_a 4000 1714 mtu "${ns_b}" veth_b 4000 1715 mtu "${ns_a}" vti6_a 5000 1716 mtu "${ns_b}" vti6_b 5000 1717 run_cmd ${ns_a} ${ping6} -q -i 0.1 -w 1 -s 60000 ${tunnel6_b_addr} 1718 1719 # Check that exception was created 1720 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})" 1721 check_pmtu_value any "${pmtu}" "creating tunnel exceeding link layer MTU" || return 1 1722 1723 # Decrease tunnel MTU, check for PMTU decrease in route exception 1724 mtu "${ns_a}" vti6_a 3000 1725 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})" 1726 check_pmtu_value "3000" "${pmtu}" "decreasing tunnel MTU" || fail=1 1727 1728 # Increase tunnel MTU, check for PMTU increase in route exception 1729 mtu "${ns_a}" vti6_a 9000 1730 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})" 1731 check_pmtu_value "9000" "${pmtu}" "increasing tunnel MTU" || fail=1 1732 1733 return ${fail} 1734} 1735 1736test_pmtu_vti4_udp_routed_exception() { 1737 setup namespaces routing vti4routed xfrm4udprouted || return $ksft_skip 1738 trace "${ns_a}" veth_A-R1 "${ns_b}" veth_B-R1 \ 1739 "${ns_a}" vti4_a "${ns_b}" vti4_b 1740 1741 veth_mtu=1500 1742 vti_mtu=$((veth_mtu - 20)) 1743 1744 # UDP SPI SN IV ICV pad length next header 1745 esp_payload_rfc4106=$((vti_mtu - 8 - 4 - 4 - 8 - 16 - 1 - 1)) 1746 ping_payload=$((esp_payload_rfc4106 - 28)) 1747 1748 mtu "${ns_a}" veth_A-R1 ${veth_mtu} 1749 mtu "${ns_r1}" veth_R1-A ${veth_mtu} 1750 mtu "${ns_b}" veth_B-R1 ${veth_mtu} 1751 mtu "${ns_r1}" veth_R1-B ${veth_mtu} 1752 1753 mtu "${ns_a}" vti4_a ${vti_mtu} 1754 mtu "${ns_b}" vti4_b ${vti_mtu} 1755 1756 # Send DF packet without exceeding link layer MTU, check that no 1757 # exception is created 1758 run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s ${ping_payload} ${tunnel4_b_addr} 1759 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel4_b_addr})" 1760 check_pmtu_value "" "${pmtu}" "sending packet smaller than PMTU (IP payload length ${esp_payload_rfc4106})" || return 1 1761 1762 # Now decrease link layer MTU by 8 bytes on R1, check that exception is created 1763 # with the right PMTU value 1764 mtu "${ns_r1}" veth_R1-B $((veth_mtu - 8)) 1765 run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s $((ping_payload)) ${tunnel4_b_addr} 1766 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel4_b_addr})" 1767 check_pmtu_value "$((esp_payload_rfc4106 - 8))" "${pmtu}" "exceeding PMTU (IP payload length $((esp_payload_rfc4106)))" 1768} 1769 1770test_pmtu_vti6_udp_routed_exception() { 1771 setup namespaces routing vti6routed xfrm6udprouted || return $ksft_skip 1772 trace "${ns_a}" veth_A-R1 "${ns_b}" veth_B-R1 \ 1773 "${ns_a}" vti6_a "${ns_b}" vti6_b 1774 1775 veth_mtu=1500 1776 vti_mtu=$((veth_mtu - 40)) 1777 1778 # UDP SPI SN IV ICV pad length next header 1779 esp_payload_rfc4106=$((vti_mtu - 8 - 4 - 4 - 8 - 16 - 1 - 1)) 1780 ping_payload=$((esp_payload_rfc4106 - 48)) 1781 1782 mtu "${ns_a}" veth_A-R1 ${veth_mtu} 1783 mtu "${ns_r1}" veth_R1-A ${veth_mtu} 1784 mtu "${ns_b}" veth_B-R1 ${veth_mtu} 1785 mtu "${ns_r1}" veth_R1-B ${veth_mtu} 1786 1787 # mtu "${ns_a}" vti6_a ${vti_mtu} 1788 # mtu "${ns_b}" vti6_b ${vti_mtu} 1789 1790 run_cmd ${ns_a} ${ping6} -q -M want -i 0.1 -w 1 -s ${ping_payload} ${tunnel6_b_addr} 1791 1792 # Check that exception was not created 1793 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})" 1794 check_pmtu_value "" "${pmtu}" "sending packet smaller than PMTU (IP payload length ${esp_payload_rfc4106})" || return 1 1795 1796 # Now decrease link layer MTU by 8 bytes on R1, check that exception is created 1797 # with the right PMTU value 1798 mtu "${ns_r1}" veth_R1-B $((veth_mtu - 8)) 1799 run_cmd ${ns_a} ${ping6} -q -M want -i 0.1 -w 1 -s $((ping_payload)) ${tunnel6_b_addr} 1800 pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})" 1801 check_pmtu_value "$((esp_payload_rfc4106 - 8))" "${pmtu}" "exceeding PMTU (IP payload length $((esp_payload_rfc4106)))" 1802 1803} 1804 1805test_pmtu_vti4_default_mtu() { 1806 setup namespaces veth vti4 || return $ksft_skip 1807 1808 # Check that MTU of vti device is MTU of veth minus IPv4 header length 1809 veth_mtu="$(link_get_mtu "${ns_a}" veth_a)" 1810 vti4_mtu="$(link_get_mtu "${ns_a}" vti4_a)" 1811 if [ $((veth_mtu - vti4_mtu)) -ne 20 ]; then 1812 err " vti MTU ${vti4_mtu} is not veth MTU ${veth_mtu} minus IPv4 header length" 1813 return 1 1814 fi 1815} 1816 1817test_pmtu_vti6_default_mtu() { 1818 setup namespaces veth vti6 || return $ksft_skip 1819 1820 # Check that MTU of vti device is MTU of veth minus IPv6 header length 1821 veth_mtu="$(link_get_mtu "${ns_a}" veth_a)" 1822 vti6_mtu="$(link_get_mtu "${ns_a}" vti6_a)" 1823 if [ $((veth_mtu - vti6_mtu)) -ne 40 ]; then 1824 err " vti MTU ${vti6_mtu} is not veth MTU ${veth_mtu} minus IPv6 header length" 1825 return 1 1826 fi 1827} 1828 1829test_pmtu_vti4_link_add_mtu() { 1830 setup namespaces || return $ksft_skip 1831 1832 run_cmd ${ns_a} ip link add vti4_a type vti local ${veth4_a_addr} remote ${veth4_b_addr} key 10 1833 [ $? -ne 0 ] && err " vti not supported" && return $ksft_skip 1834 run_cmd ${ns_a} ip link del vti4_a 1835 1836 fail=0 1837 1838 min=68 1839 max=$((65535 - 20)) 1840 # Check invalid values first 1841 for v in $((min - 1)) $((max + 1)); do 1842 run_cmd ${ns_a} ip link add vti4_a mtu ${v} type vti local ${veth4_a_addr} remote ${veth4_b_addr} key 10 1843 # This can fail, or MTU can be adjusted to a proper value 1844 [ $? -ne 0 ] && continue 1845 mtu="$(link_get_mtu "${ns_a}" vti4_a)" 1846 if [ ${mtu} -lt ${min} -o ${mtu} -gt ${max} ]; then 1847 err " vti tunnel created with invalid MTU ${mtu}" 1848 fail=1 1849 fi 1850 run_cmd ${ns_a} ip link del vti4_a 1851 done 1852 1853 # Now check valid values 1854 for v in ${min} 1300 ${max}; do 1855 run_cmd ${ns_a} ip link add vti4_a mtu ${v} type vti local ${veth4_a_addr} remote ${veth4_b_addr} key 10 1856 mtu="$(link_get_mtu "${ns_a}" vti4_a)" 1857 run_cmd ${ns_a} ip link del vti4_a 1858 if [ "${mtu}" != "${v}" ]; then 1859 err " vti MTU ${mtu} doesn't match configured value ${v}" 1860 fail=1 1861 fi 1862 done 1863 1864 return ${fail} 1865} 1866 1867test_pmtu_vti6_link_add_mtu() { 1868 setup namespaces || return $ksft_skip 1869 1870 run_cmd ${ns_a} ip link add vti6_a type vti6 local ${veth6_a_addr} remote ${veth6_b_addr} key 10 1871 [ $? -ne 0 ] && err " vti6 not supported" && return $ksft_skip 1872 run_cmd ${ns_a} ip link del vti6_a 1873 1874 fail=0 1875 1876 min=68 # vti6 can carry IPv4 packets too 1877 max=$((65535 - 40)) 1878 # Check invalid values first 1879 for v in $((min - 1)) $((max + 1)); do 1880 run_cmd ${ns_a} ip link add vti6_a mtu ${v} type vti6 local ${veth6_a_addr} remote ${veth6_b_addr} key 10 1881 # This can fail, or MTU can be adjusted to a proper value 1882 [ $? -ne 0 ] && continue 1883 mtu="$(link_get_mtu "${ns_a}" vti6_a)" 1884 if [ ${mtu} -lt ${min} -o ${mtu} -gt ${max} ]; then 1885 err " vti6 tunnel created with invalid MTU ${v}" 1886 fail=1 1887 fi 1888 run_cmd ${ns_a} ip link del vti6_a 1889 done 1890 1891 # Now check valid values 1892 for v in 68 1280 1300 $((65535 - 40)); do 1893 run_cmd ${ns_a} ip link add vti6_a mtu ${v} type vti6 local ${veth6_a_addr} remote ${veth6_b_addr} key 10 1894 mtu="$(link_get_mtu "${ns_a}" vti6_a)" 1895 run_cmd ${ns_a} ip link del vti6_a 1896 if [ "${mtu}" != "${v}" ]; then 1897 err " vti6 MTU ${mtu} doesn't match configured value ${v}" 1898 fail=1 1899 fi 1900 done 1901 1902 return ${fail} 1903} 1904 1905test_pmtu_vti6_link_change_mtu() { 1906 setup namespaces || return $ksft_skip 1907 1908 run_cmd ${ns_a} ip link add dummy0 mtu 1500 type dummy 1909 [ $? -ne 0 ] && err " dummy not supported" && return $ksft_skip 1910 run_cmd ${ns_a} ip link add dummy1 mtu 3000 type dummy 1911 run_cmd ${ns_a} ip link set dummy0 up 1912 run_cmd ${ns_a} ip link set dummy1 up 1913 1914 run_cmd ${ns_a} ip addr add ${dummy6_0_prefix}1/${dummy6_mask} dev dummy0 1915 run_cmd ${ns_a} ip addr add ${dummy6_1_prefix}1/${dummy6_mask} dev dummy1 1916 1917 fail=0 1918 1919 # Create vti6 interface bound to device, passing MTU, check it 1920 run_cmd ${ns_a} ip link add vti6_a mtu 1300 type vti6 remote ${dummy6_0_prefix}2 local ${dummy6_0_prefix}1 1921 mtu="$(link_get_mtu "${ns_a}" vti6_a)" 1922 if [ ${mtu} -ne 1300 ]; then 1923 err " vti6 MTU ${mtu} doesn't match configured value 1300" 1924 fail=1 1925 fi 1926 1927 # Move to another device with different MTU, without passing MTU, check 1928 # MTU is adjusted 1929 run_cmd ${ns_a} ip link set vti6_a type vti6 remote ${dummy6_1_prefix}2 local ${dummy6_1_prefix}1 1930 mtu="$(link_get_mtu "${ns_a}" vti6_a)" 1931 if [ ${mtu} -ne $((3000 - 40)) ]; then 1932 err " vti MTU ${mtu} is not dummy MTU 3000 minus IPv6 header length" 1933 fail=1 1934 fi 1935 1936 # Move it back, passing MTU, check MTU is not overridden 1937 run_cmd ${ns_a} ip link set vti6_a mtu 1280 type vti6 remote ${dummy6_0_prefix}2 local ${dummy6_0_prefix}1 1938 mtu="$(link_get_mtu "${ns_a}" vti6_a)" 1939 if [ ${mtu} -ne 1280 ]; then 1940 err " vti6 MTU ${mtu} doesn't match configured value 1280" 1941 fail=1 1942 fi 1943 1944 return ${fail} 1945} 1946 1947check_command() { 1948 cmd=${1} 1949 1950 if ! which ${cmd} > /dev/null 2>&1; then 1951 err " missing required command: '${cmd}'" 1952 return 1 1953 fi 1954 return 0 1955} 1956 1957test_cleanup_vxlanX_exception() { 1958 outer="${1}" 1959 encap="vxlan" 1960 ll_mtu=4000 1961 1962 check_command taskset || return $ksft_skip 1963 cpu_list=$(grep -m 2 processor /proc/cpuinfo | cut -d ' ' -f 2) 1964 1965 setup namespaces routing ${encap}${outer} || return $ksft_skip 1966 trace "${ns_a}" ${encap}_a "${ns_b}" ${encap}_b \ 1967 "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \ 1968 "${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B 1969 1970 # Create route exception by exceeding link layer MTU 1971 mtu "${ns_a}" veth_A-R1 $((${ll_mtu} + 1000)) 1972 mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000)) 1973 mtu "${ns_b}" veth_B-R1 ${ll_mtu} 1974 mtu "${ns_r1}" veth_R1-B ${ll_mtu} 1975 1976 mtu "${ns_a}" ${encap}_a $((${ll_mtu} + 1000)) 1977 mtu "${ns_b}" ${encap}_b $((${ll_mtu} + 1000)) 1978 1979 # Fill exception cache for multiple CPUs (2) 1980 # we can always use inner IPv4 for that 1981 for cpu in ${cpu_list}; do 1982 run_cmd taskset --cpu-list ${cpu} ${ns_a} ping -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${tunnel4_b_addr} 1983 done 1984 1985 ${ns_a} ip link del dev veth_A-R1 & 1986 iplink_pid=$! 1987 sleep 1 1988 if [ "$(cat /proc/${iplink_pid}/cmdline 2>/dev/null | tr -d '\0')" = "iplinkdeldevveth_A-R1" ]; then 1989 err " can't delete veth device in a timely manner, PMTU dst likely leaked" 1990 return 1 1991 fi 1992} 1993 1994test_cleanup_ipv6_exception() { 1995 test_cleanup_vxlanX_exception 6 1996} 1997 1998test_cleanup_ipv4_exception() { 1999 test_cleanup_vxlanX_exception 4 2000} 2001 2002run_test() { 2003 ( 2004 tname="$1" 2005 tdesc="$2" 2006 2007 unset IFS 2008 2009 # Since cleanup() relies on variables modified by this subshell, it 2010 # has to run in this context. 2011 trap cleanup EXIT 2012 2013 if [ "$VERBOSE" = "1" ]; then 2014 printf "\n##########################################################################\n\n" 2015 fi 2016 2017 eval test_${tname} 2018 ret=$? 2019 2020 if [ $ret -eq 0 ]; then 2021 printf "TEST: %-60s [ OK ]\n" "${tdesc}" 2022 elif [ $ret -eq 1 ]; then 2023 printf "TEST: %-60s [FAIL]\n" "${tdesc}" 2024 if [ "${PAUSE_ON_FAIL}" = "yes" ]; then 2025 echo 2026 echo "Pausing. Hit enter to continue" 2027 read a 2028 fi 2029 err_flush 2030 exit 1 2031 elif [ $ret -eq $ksft_skip ]; then 2032 printf "TEST: %-60s [SKIP]\n" "${tdesc}" 2033 err_flush 2034 fi 2035 2036 return $ret 2037 ) 2038 ret=$? 2039 case $ret in 2040 0) 2041 all_skipped=false 2042 [ $exitcode -eq $ksft_skip ] && exitcode=0 2043 ;; 2044 $ksft_skip) 2045 [ $all_skipped = true ] && exitcode=$ksft_skip 2046 ;; 2047 *) 2048 all_skipped=false 2049 exitcode=1 2050 ;; 2051 esac 2052 2053 return $ret 2054} 2055 2056run_test_nh() { 2057 tname="$1" 2058 tdesc="$2" 2059 2060 USE_NH=yes 2061 run_test "${tname}" "${tdesc} - nexthop objects" 2062 USE_NH=no 2063} 2064 2065test_list_flush_ipv4_exception() { 2066 setup namespaces routing || return $ksft_skip 2067 trace "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \ 2068 "${ns_r1}" veth_R1-B "${ns_b}" veth_B-R1 \ 2069 "${ns_a}" veth_A-R2 "${ns_r2}" veth_R2-A \ 2070 "${ns_r2}" veth_R2-B "${ns_b}" veth_B-R2 2071 2072 dst_prefix1="${prefix4}.${b_r1}." 2073 dst2="${prefix4}.${b_r2}.1" 2074 2075 # Set up initial MTU values 2076 mtu "${ns_a}" veth_A-R1 2000 2077 mtu "${ns_r1}" veth_R1-A 2000 2078 mtu "${ns_r1}" veth_R1-B 1500 2079 mtu "${ns_b}" veth_B-R1 1500 2080 2081 mtu "${ns_a}" veth_A-R2 2000 2082 mtu "${ns_r2}" veth_R2-A 2000 2083 mtu "${ns_r2}" veth_R2-B 1500 2084 mtu "${ns_b}" veth_B-R2 1500 2085 2086 fail=0 2087 2088 # Add 100 addresses for veth endpoint on B reached by default A route 2089 for i in $(seq 100 199); do 2090 run_cmd ${ns_b} ip addr add "${dst_prefix1}${i}" dev veth_B-R1 2091 done 2092 2093 # Create 100 cached route exceptions for path via R1, one via R2. Note 2094 # that with IPv4 we need to actually cause a route lookup that matches 2095 # the exception caused by ICMP, in order to actually have a cached 2096 # route, so we need to ping each destination twice 2097 for i in $(seq 100 199); do 2098 run_cmd ${ns_a} ping -q -M want -i 0.1 -c 2 -s 1800 "${dst_prefix1}${i}" 2099 done 2100 run_cmd ${ns_a} ping -q -M want -i 0.1 -c 2 -s 1800 "${dst2}" 2101 2102 if [ "$(${ns_a} ip -oneline route list cache | wc -l)" -ne 101 ]; then 2103 err " can't list cached exceptions" 2104 fail=1 2105 fi 2106 2107 run_cmd ${ns_a} ip route flush cache 2108 pmtu1="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst_prefix}1)" 2109 pmtu2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst_prefix}2)" 2110 if [ -n "${pmtu1}" ] || [ -n "${pmtu2}" ] || \ 2111 [ -n "$(${ns_a} ip route list cache)" ]; then 2112 err " can't flush cached exceptions" 2113 fail=1 2114 fi 2115 2116 return ${fail} 2117} 2118 2119test_list_flush_ipv6_exception() { 2120 setup namespaces routing || return $ksft_skip 2121 trace "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \ 2122 "${ns_r1}" veth_R1-B "${ns_b}" veth_B-R1 \ 2123 "${ns_a}" veth_A-R2 "${ns_r2}" veth_R2-A \ 2124 "${ns_r2}" veth_R2-B "${ns_b}" veth_B-R2 2125 2126 dst_prefix1="${prefix6}:${b_r1}::" 2127 dst2="${prefix6}:${b_r2}::1" 2128 2129 # Set up initial MTU values 2130 mtu "${ns_a}" veth_A-R1 2000 2131 mtu "${ns_r1}" veth_R1-A 2000 2132 mtu "${ns_r1}" veth_R1-B 1500 2133 mtu "${ns_b}" veth_B-R1 1500 2134 2135 mtu "${ns_a}" veth_A-R2 2000 2136 mtu "${ns_r2}" veth_R2-A 2000 2137 mtu "${ns_r2}" veth_R2-B 1500 2138 mtu "${ns_b}" veth_B-R2 1500 2139 2140 fail=0 2141 2142 # Add 100 addresses for veth endpoint on B reached by default A route 2143 for i in $(seq 100 199); do 2144 run_cmd ${ns_b} ip addr add "${dst_prefix1}${i}" dev veth_B-R1 2145 done 2146 2147 # Create 100 cached route exceptions for path via R1, one via R2 2148 for i in $(seq 100 199); do 2149 run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s 1800 "${dst_prefix1}${i}" 2150 done 2151 run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s 1800 "${dst2}" 2152 if [ "$(${ns_a} ip -oneline -6 route list cache | wc -l)" -ne 101 ]; then 2153 err " can't list cached exceptions" 2154 fail=1 2155 fi 2156 2157 run_cmd ${ns_a} ip -6 route flush cache 2158 pmtu1="$(route_get_dst_pmtu_from_exception "${ns_a}" "${dst_prefix1}100")" 2159 pmtu2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})" 2160 if [ -n "${pmtu1}" ] || [ -n "${pmtu2}" ] || \ 2161 [ -n "$(${ns_a} ip -6 route list cache)" ]; then 2162 err " can't flush cached exceptions" 2163 fail=1 2164 fi 2165 2166 return ${fail} 2167} 2168 2169test_pmtu_ipvX_route_change() { 2170 family=${1} 2171 2172 setup namespaces routing || return 2 2173 trace "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \ 2174 "${ns_r1}" veth_R1-B "${ns_b}" veth_B-R1 \ 2175 "${ns_a}" veth_A-R2 "${ns_r2}" veth_R2-A \ 2176 "${ns_r2}" veth_R2-B "${ns_b}" veth_B-R2 2177 2178 if [ ${family} -eq 4 ]; then 2179 ping=ping 2180 dst1="${prefix4}.${b_r1}.1" 2181 dst2="${prefix4}.${b_r2}.1" 2182 gw="${prefix4}.${a_r1}.2" 2183 else 2184 ping=${ping6} 2185 dst1="${prefix6}:${b_r1}::1" 2186 dst2="${prefix6}:${b_r2}::1" 2187 gw="${prefix6}:${a_r1}::2" 2188 fi 2189 2190 # Set up initial MTU values 2191 mtu "${ns_a}" veth_A-R1 2000 2192 mtu "${ns_r1}" veth_R1-A 2000 2193 mtu "${ns_r1}" veth_R1-B 1400 2194 mtu "${ns_b}" veth_B-R1 1400 2195 2196 mtu "${ns_a}" veth_A-R2 2000 2197 mtu "${ns_r2}" veth_R2-A 2000 2198 mtu "${ns_r2}" veth_R2-B 1500 2199 mtu "${ns_b}" veth_B-R2 1500 2200 2201 # Create route exceptions 2202 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1800 ${dst1} 2203 run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1800 ${dst2} 2204 2205 # Check that exceptions have been created with the correct PMTU 2206 pmtu_1="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst1})" 2207 check_pmtu_value "1400" "${pmtu_1}" "exceeding MTU" || return 1 2208 pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})" 2209 check_pmtu_value "1500" "${pmtu_2}" "exceeding MTU" || return 1 2210 2211 # Replace the route from A to R1 2212 run_cmd ${ns_a} ip route change default via ${gw} 2213 2214 # Delete the device in A 2215 run_cmd ${ns_a} ip link del "veth_A-R1" 2216} 2217 2218test_pmtu_ipv4_route_change() { 2219 test_pmtu_ipvX_route_change 4 2220} 2221 2222test_pmtu_ipv6_route_change() { 2223 test_pmtu_ipvX_route_change 6 2224} 2225 2226usage() { 2227 echo 2228 echo "$0 [OPTIONS] [TEST]..." 2229 echo "If no TEST argument is given, all tests will be run." 2230 echo 2231 echo "Options" 2232 echo " --trace: capture traffic to TEST_INTERFACE.pcap" 2233 echo 2234 echo "Available tests${tests}" 2235 exit 1 2236} 2237 2238################################################################################ 2239# 2240exitcode=0 2241desc=0 2242all_skipped=true 2243 2244while getopts :ptv o 2245do 2246 case $o in 2247 p) PAUSE_ON_FAIL=yes;; 2248 v) VERBOSE=1;; 2249 t) if which tcpdump > /dev/null 2>&1; then 2250 TRACING=1 2251 else 2252 echo "=== tcpdump not available, tracing disabled" 2253 fi 2254 ;; 2255 *) usage;; 2256 esac 2257done 2258shift $(($OPTIND-1)) 2259 2260IFS=" 2261" 2262 2263for arg do 2264 # Check first that all requested tests are available before running any 2265 command -v > /dev/null "test_${arg}" || { echo "=== Test ${arg} not found"; usage; } 2266done 2267 2268trap cleanup EXIT 2269 2270# start clean 2271cleanup 2272 2273HAVE_NH=no 2274ip nexthop ls >/dev/null 2>&1 2275[ $? -eq 0 ] && HAVE_NH=yes 2276 2277name="" 2278desc="" 2279rerun_nh=0 2280for t in ${tests}; do 2281 [ "${name}" = "" ] && name="${t}" && continue 2282 [ "${desc}" = "" ] && desc="${t}" && continue 2283 2284 if [ "${HAVE_NH}" = "yes" ]; then 2285 rerun_nh="${t}" 2286 fi 2287 2288 run_this=1 2289 for arg do 2290 [ "${arg}" != "${arg#--*}" ] && continue 2291 [ "${arg}" = "${name}" ] && run_this=1 && break 2292 run_this=0 2293 done 2294 if [ $run_this -eq 1 ]; then 2295 run_test "${name}" "${desc}" 2296 # if test was skipped no need to retry with nexthop objects 2297 [ $? -eq $ksft_skip ] && rerun_nh=0 2298 2299 if [ "${rerun_nh}" = "1" ]; then 2300 run_test_nh "${name}" "${desc}" 2301 fi 2302 fi 2303 name="" 2304 desc="" 2305 rerun_nh=0 2306done 2307 2308exit ${exitcode} 2309