tools/testing/selftests/net/pmtu.sh

   1 #!/bin/sh
   2 # SPDX-License-Identifier: GPL-2.0
   3 #
   4 # Check that route PMTU values match expectations, and that initial device MTU
   5 # values are assigned correctly
   6 #
   7 # Tests currently implemented:
   8 #
   9 # - pmtu_ipv4
  10 #       Set up two namespaces, A and B, with two paths between them over routers
  11 #       R1 and R2 (also implemented with namespaces), with different MTUs:
  12 #
  13 #         segment a_r1    segment b_r1          a_r1: 2000
  14 #       .--------------R1--------------.        a_r2: 1500
  15 #       A                               B       a_r3: 2000
  16 #       '--------------R2--------------'        a_r4: 1400
  17 #         segment a_r2    segment b_r2
  18 #
  19 #       Check that PMTU exceptions with the correct PMTU are created. Then
  20 #       decrease and increase the MTU of the local link for one of the paths,
  21 #       A to R1, checking that route exception PMTU changes accordingly over
  22 #       this path. Also check that locked exceptions are created when an ICMP
  23 #       message advertising a PMTU smaller than net.ipv4.route.min_pmtu is
  24 #       received
  25 #
  26 # - pmtu_ipv6
  27 #       Same as pmtu_ipv4, except for locked PMTU tests, using IPv6
  28 #
  29 # - pmtu_ipv4_vxlan4_exception
  30 #       Set up the same network topology as pmtu_ipv4, create a VXLAN tunnel
  31 #       over IPv4 between A and B, routed via R1. On the link between R1 and B,
  32 #       set a MTU lower than the VXLAN MTU and the MTU on the link between A and
  33 #       R1. Send IPv4 packets, exceeding the MTU between R1 and B, over VXLAN
  34 #       from A to B and check that the PMTU exception is created with the right
  35 #       value on A
  36 #
  37 # - pmtu_ipv6_vxlan4_exception
  38 #       Same as pmtu_ipv4_vxlan4_exception, but send IPv6 packets from A to B
  39 #
  40 # - pmtu_ipv4_vxlan6_exception
  41 #       Same as pmtu_ipv4_vxlan4_exception, but use IPv6 transport from A to B
  42 #
  43 # - pmtu_ipv6_vxlan6_exception
  44 #       Same as pmtu_ipv4_vxlan6_exception, but send IPv6 packets from A to B
  45 #
  46 # - pmtu_ipv4_geneve4_exception
  47 #       Same as pmtu_ipv4_vxlan4_exception, but using a GENEVE tunnel instead of
  48 #       VXLAN
  49 #
  50 # - pmtu_ipv6_geneve4_exception
  51 #       Same as pmtu_ipv6_vxlan4_exception, but using a GENEVE tunnel instead of
  52 #       VXLAN
  53 #
  54 # - pmtu_ipv4_geneve6_exception
  55 #       Same as pmtu_ipv4_vxlan6_exception, but using a GENEVE tunnel instead of
  56 #       VXLAN
  57 #
  58 # - pmtu_ipv6_geneve6_exception
  59 #       Same as pmtu_ipv6_vxlan6_exception, but using a GENEVE tunnel instead of
  60 #       VXLAN
  61 #
  62 # - pmtu_ipv{4,6}_fou{4,6}_exception
  63 #       Same as pmtu_ipv4_vxlan4, but using a direct IPv4/IPv6 encapsulation
  64 #       (FoU) over IPv4/IPv6, instead of VXLAN
  65 #
  66 # - pmtu_ipv{4,6}_fou{4,6}_exception
  67 #       Same as pmtu_ipv4_vxlan4, but using a generic UDP IPv4/IPv6
  68 #       encapsulation (GUE) over IPv4/IPv6, instead of VXLAN
  69 #
  70 # - pmtu_vti4_exception
  71 #       Set up vti tunnel on top of veth, with xfrm states and policies, in two
  72 #       namespaces with matching endpoints. Check that route exception is not
  73 #       created if link layer MTU is not exceeded, then exceed it and check that
  74 #       exception is created with the expected PMTU. The approach described
  75 #       below for IPv6 doesn't apply here, because, on IPv4, administrative MTU
  76 #       changes alone won't affect PMTU
  77 #
  78 # - pmtu_vti6_exception
  79 #       Set up vti6 tunnel on top of veth, with xfrm states and policies, in two
  80 #       namespaces with matching endpoints. Check that route exception is
  81 #       created by exceeding link layer MTU with ping to other endpoint. Then
  82 #       decrease and increase MTU of tunnel, checking that route exception PMTU
  83 #       changes accordingly
  84 #
  85 # - pmtu_vti4_default_mtu
  86 #       Set up vti4 tunnel on top of veth, in two namespaces with matching
  87 #       endpoints. Check that MTU assigned to vti interface is the MTU of the
  88 #       lower layer (veth) minus additional lower layer headers (zero, for veth)
  89 #       minus IPv4 header length
  90 #
  91 # - pmtu_vti6_default_mtu
  92 #       Same as above, for IPv6
  93 #
  94 # - pmtu_vti4_link_add_mtu
  95 #       Set up vti4 interface passing MTU value at link creation, check MTU is
  96 #       configured, and that link is not created with invalid MTU values
  97 #
  98 # - pmtu_vti6_link_add_mtu
  99 #       Same as above, for IPv6
 100 #
 101 # - pmtu_vti6_link_change_mtu
 102 #       Set up two dummy interfaces with different MTUs, create a vti6 tunnel
 103 #       and check that configured MTU is used on link creation and changes, and
 104 #       that MTU is properly calculated instead when MTU is not configured from
 105 #       userspace
 106 #
 107 # - cleanup_ipv4_exception
 108 #       Similar to pmtu_ipv4_vxlan4_exception, but explicitly generate PMTU
 109 #       exceptions on multiple CPUs and check that the veth device tear-down
 110 #       happens in a timely manner
 111 #
 112 # - cleanup_ipv6_exception
 113 #       Same as above, but use IPv6 transport from A to B
 114 #
 115 # - list_flush_ipv4_exception
 116 #       Using the same topology as in pmtu_ipv4, create exceptions, and check
 117 #       they are shown when listing exception caches, gone after flushing them
 118 #
 119 # - list_flush_ipv6_exception
 120 #       Using the same topology as in pmtu_ipv6, create exceptions, and check
 121 #       they are shown when listing exception caches, gone after flushing them
 122
 123
 124 # Kselftest framework requirement - SKIP code is 4.
 125 ksft_skip=4
 126
 127 PAUSE_ON_FAIL=no
 128 VERBOSE=0
 129 TRACING=0
 130
 131 # Some systems don't have a ping6 binary anymore
 132 which ping6 > /dev/null 2>&1 && ping6=$(which ping6) || ping6=$(which ping)
 133
 134 #               Name                          Description                  re-run with nh
 135 tests="
 136         pmtu_ipv4_exception             ipv4: PMTU exceptions                   1
 137         pmtu_ipv6_exception             ipv6: PMTU exceptions                   1
 138         pmtu_ipv4_vxlan4_exception      IPv4 over vxlan4: PMTU exceptions       1
 139         pmtu_ipv6_vxlan4_exception      IPv6 over vxlan4: PMTU exceptions       1
 140         pmtu_ipv4_vxlan6_exception      IPv4 over vxlan6: PMTU exceptions       1
 141         pmtu_ipv6_vxlan6_exception      IPv6 over vxlan6: PMTU exceptions       1
 142         pmtu_ipv4_geneve4_exception     IPv4 over geneve4: PMTU exceptions      1
 143         pmtu_ipv6_geneve4_exception     IPv6 over geneve4: PMTU exceptions      1
 144         pmtu_ipv4_geneve6_exception     IPv4 over geneve6: PMTU exceptions      1
 145         pmtu_ipv6_geneve6_exception     IPv6 over geneve6: PMTU exceptions      1
 146         pmtu_ipv4_fou4_exception        IPv4 over fou4: PMTU exceptions         1
 147         pmtu_ipv6_fou4_exception        IPv6 over fou4: PMTU exceptions         1
 148         pmtu_ipv4_fou6_exception        IPv4 over fou6: PMTU exceptions         1
 149         pmtu_ipv6_fou6_exception        IPv6 over fou6: PMTU exceptions         1
 150         pmtu_ipv4_gue4_exception        IPv4 over gue4: PMTU exceptions         1
 151         pmtu_ipv6_gue4_exception        IPv6 over gue4: PMTU exceptions         1
 152         pmtu_ipv4_gue6_exception        IPv4 over gue6: PMTU exceptions         1
 153         pmtu_ipv6_gue6_exception        IPv6 over gue6: PMTU exceptions         1
 154         pmtu_vti6_exception             vti6: PMTU exceptions                   0
 155         pmtu_vti4_exception             vti4: PMTU exceptions                   0
 156         pmtu_vti4_default_mtu           vti4: default MTU assignment            0
 157         pmtu_vti6_default_mtu           vti6: default MTU assignment            0
 158         pmtu_vti4_link_add_mtu          vti4: MTU setting on link creation      0
 159         pmtu_vti6_link_add_mtu          vti6: MTU setting on link creation      0
 160         pmtu_vti6_link_change_mtu       vti6: MTU changes on link changes       0
 161         cleanup_ipv4_exception          ipv4: cleanup of cached exceptions      1
 162         cleanup_ipv6_exception          ipv6: cleanup of cached exceptions      1
 163         list_flush_ipv4_exception       ipv4: list and flush cached exceptions  1
 164         list_flush_ipv6_exception       ipv6: list and flush cached exceptions  1"
 165
 166 NS_A="ns-A"
 167 NS_B="ns-B"
 168 NS_R1="ns-R1"
 169 NS_R2="ns-R2"
 170 ns_a="ip netns exec ${NS_A}"
 171 ns_b="ip netns exec ${NS_B}"
 172 ns_r1="ip netns exec ${NS_R1}"
 173 ns_r2="ip netns exec ${NS_R2}"
 174
 175 # Addressing and routing for tests with routers: four network segments, with
 176 # index SEGMENT between 1 and 4, a common prefix (PREFIX4 or PREFIX6) and an
 177 # identifier ID, which is 1 for hosts (A and B), 2 for routers (R1 and R2).
 178 # Addresses are:
 179 # - IPv4: PREFIX4.SEGMENT.ID (/24)
 180 # - IPv6: PREFIX6:SEGMENT::ID (/64)
 181 prefix4="10.0"
 182 prefix6="fc00"
 183 a_r1=1
 184 a_r2=2
 185 b_r1=3
 186 b_r2=4
 187 #       ns      peer    segment
 188 routing_addrs="
 189         A       R1      ${a_r1}
 190         A       R2      ${a_r2}
 191         B       R1      ${b_r1}
 192         B       R2      ${b_r2}
 193 "
 194 # Traffic from A to B goes through R1 by default, and through R2, if destined to
 195 # B's address on the b_r2 segment.
 196 # Traffic from B to A goes through R1.
 197 #       ns      destination             gateway
 198 routes="
 199         A       default                 ${prefix4}.${a_r1}.2
 200         A       ${prefix4}.${b_r2}.1    ${prefix4}.${a_r2}.2
 201         B       default                 ${prefix4}.${b_r1}.2
 202
 203         A       default                 ${prefix6}:${a_r1}::2
 204         A       ${prefix6}:${b_r2}::1   ${prefix6}:${a_r2}::2
 205         B       default                 ${prefix6}:${b_r1}::2
 206 "
 207
 208 USE_NH="no"
 209 #       ns      family  nh id      destination          gateway
 210 nexthops="
 211         A       4       41      ${prefix4}.${a_r1}.2    veth_A-R1
 212         A       4       42      ${prefix4}.${a_r2}.2    veth_A-R2
 213         B       4       41      ${prefix4}.${b_r1}.2    veth_B-R1
 214
 215         A       6       61      ${prefix6}:${a_r1}::2   veth_A-R1
 216         A       6       62      ${prefix6}:${a_r2}::2   veth_A-R2
 217         B       6       61      ${prefix6}:${b_r1}::2   veth_B-R1
 218 "
 219
 220 # nexthop id correlates to id in nexthops config above
 221 #       ns    family    prefix                  nh id
 222 routes_nh="
 223         A       4       default                 41
 224         A       4       ${prefix4}.${b_r2}.1    42
 225         B       4       default                 41
 226
 227         A       6       default                 61
 228         A       6       ${prefix6}:${b_r2}::1   62
 229         B       6       default                 61
 230 "
 231
 232 veth4_a_addr="192.168.1.1"
 233 veth4_b_addr="192.168.1.2"
 234 veth4_mask="24"
 235 veth6_a_addr="fd00:1::a"
 236 veth6_b_addr="fd00:1::b"
 237 veth6_mask="64"
 238
 239 tunnel4_a_addr="192.168.2.1"
 240 tunnel4_b_addr="192.168.2.2"
 241 tunnel4_mask="24"
 242 tunnel6_a_addr="fd00:2::a"
 243 tunnel6_b_addr="fd00:2::b"
 244 tunnel6_mask="64"
 245
 246 dummy6_0_prefix="fc00:1000::"
 247 dummy6_1_prefix="fc00:1001::"
 248 dummy6_mask="64"
 249
 250 err_buf=
 251 tcpdump_pids=
 252
 253 err() {
 254         err_buf="${err_buf}${1}
 255 "
 256 }
 257
 258 err_flush() {
 259         echo -n "${err_buf}"
 260         err_buf=
 261 }
 262
 263 run_cmd() {
 264         cmd="$*"
 265
 266         if [ "$VERBOSE" = "1" ]; then
 267                 printf "    COMMAND: $cmd\n"
 268         fi
 269
 270         out="$($cmd 2>&1)"
 271         rc=$?
 272         if [ "$VERBOSE" = "1" -a -n "$out" ]; then
 273                 echo "    $out"
 274                 echo
 275         fi
 276
 277         return $rc
 278 }
 279
 280 # Find the auto-generated name for this namespace
 281 nsname() {
 282         eval echo \$NS_$1
 283 }
 284
 285 setup_fou_or_gue() {
 286         outer="${1}"
 287         inner="${2}"
 288         encap="${3}"
 289
 290         if [ "${outer}" = "4" ]; then
 291                 modprobe fou || return 2
 292                 a_addr="${prefix4}.${a_r1}.1"
 293                 b_addr="${prefix4}.${b_r1}.1"
 294                 if [ "${inner}" = "4" ]; then
 295                         type="ipip"
 296                         ipproto="4"
 297                 else
 298                         type="sit"
 299                         ipproto="41"
 300                 fi
 301         else
 302                 modprobe fou6 || return 2
 303                 a_addr="${prefix6}:${a_r1}::1"
 304                 b_addr="${prefix6}:${b_r1}::1"
 305                 if [ "${inner}" = "4" ]; then
 306                         type="ip6tnl"
 307                         mode="mode ipip6"
 308                         ipproto="4 -6"
 309                 else
 310                         type="ip6tnl"
 311                         mode="mode ip6ip6"
 312                         ipproto="41 -6"
 313                 fi
 314         fi
 315
 316         run_cmd ${ns_a} ip fou add port 5555 ipproto ${ipproto} || return 2
 317         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 2
 318
 319         run_cmd ${ns_b} ip fou add port 5556 ipproto ${ipproto}
 320         run_cmd ${ns_b} ip link add ${encap}_b type ${type} ${mode} local ${b_addr} remote ${a_addr} encap ${encap} encap-sport auto encap-dport 5555
 321
 322         if [ "${inner}" = "4" ]; then
 323                 run_cmd ${ns_a} ip addr add ${tunnel4_a_addr}/${tunnel4_mask} dev ${encap}_a
 324                 run_cmd ${ns_b} ip addr add ${tunnel4_b_addr}/${tunnel4_mask} dev ${encap}_b
 325         else
 326                 run_cmd ${ns_a} ip addr add ${tunnel6_a_addr}/${tunnel6_mask} dev ${encap}_a
 327                 run_cmd ${ns_b} ip addr add ${tunnel6_b_addr}/${tunnel6_mask} dev ${encap}_b
 328         fi
 329
 330         run_cmd ${ns_a} ip link set ${encap}_a up
 331         run_cmd ${ns_b} ip link set ${encap}_b up
 332 }
 333
 334 setup_fou44() {
 335         setup_fou_or_gue 4 4 fou
 336 }
 337
 338 setup_fou46() {
 339         setup_fou_or_gue 4 6 fou
 340 }
 341
 342 setup_fou64() {
 343         setup_fou_or_gue 6 4 fou
 344 }
 345
 346 setup_fou66() {
 347         setup_fou_or_gue 6 6 fou
 348 }
 349
 350 setup_gue44() {
 351         setup_fou_or_gue 4 4 gue
 352 }
 353
 354 setup_gue46() {
 355         setup_fou_or_gue 4 6 gue
 356 }
 357
 358 setup_gue64() {
 359         setup_fou_or_gue 6 4 gue
 360 }
 361
 362 setup_gue66() {
 363         setup_fou_or_gue 6 6 gue
 364 }
 365
 366 setup_namespaces() {
 367         for n in ${NS_A} ${NS_B} ${NS_R1} ${NS_R2}; do
 368                 ip netns add ${n} || return 1
 369
 370                 # Disable DAD, so that we don't have to wait to use the
 371                 # configured IPv6 addresses
 372                 ip netns exec ${n} sysctl -q net/ipv6/conf/default/accept_dad=0
 373         done
 374 }
 375
 376 setup_veth() {
 377         run_cmd ${ns_a} ip link add veth_a type veth peer name veth_b || return 1
 378         run_cmd ${ns_a} ip link set veth_b netns ${NS_B}
 379
 380         run_cmd ${ns_a} ip addr add ${veth4_a_addr}/${veth4_mask} dev veth_a
 381         run_cmd ${ns_b} ip addr add ${veth4_b_addr}/${veth4_mask} dev veth_b
 382
 383         run_cmd ${ns_a} ip addr add ${veth6_a_addr}/${veth6_mask} dev veth_a
 384         run_cmd ${ns_b} ip addr add ${veth6_b_addr}/${veth6_mask} dev veth_b
 385
 386         run_cmd ${ns_a} ip link set veth_a up
 387         run_cmd ${ns_b} ip link set veth_b up
 388 }
 389
 390 setup_vti() {
 391         proto=${1}
 392         veth_a_addr="${2}"
 393         veth_b_addr="${3}"
 394         vti_a_addr="${4}"
 395         vti_b_addr="${5}"
 396         vti_mask=${6}
 397
 398         [ ${proto} -eq 6 ] && vti_type="vti6" || vti_type="vti"
 399
 400         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
 401         run_cmd ${ns_b} ip link add vti${proto}_b type ${vti_type} local ${veth_b_addr} remote ${veth_a_addr} key 10
 402
 403         run_cmd ${ns_a} ip addr add ${vti_a_addr}/${vti_mask} dev vti${proto}_a
 404         run_cmd ${ns_b} ip addr add ${vti_b_addr}/${vti_mask} dev vti${proto}_b
 405
 406         run_cmd ${ns_a} ip link set vti${proto}_a up
 407         run_cmd ${ns_b} ip link set vti${proto}_b up
 408 }
 409
 410 setup_vti4() {
 411         setup_vti 4 ${veth4_a_addr} ${veth4_b_addr} ${tunnel4_a_addr} ${tunnel4_b_addr} ${tunnel4_mask}
 412 }
 413
 414 setup_vti6() {
 415         setup_vti 6 ${veth6_a_addr} ${veth6_b_addr} ${tunnel6_a_addr} ${tunnel6_b_addr} ${tunnel6_mask}
 416 }
 417
 418 setup_vxlan_or_geneve() {
 419         type="${1}"
 420         a_addr="${2}"
 421         b_addr="${3}"
 422         opts="${4}"
 423
 424         if [ "${type}" = "vxlan" ]; then
 425                 opts="${opts} ttl 64 dstport 4789"
 426                 opts_a="local ${a_addr}"
 427                 opts_b="local ${b_addr}"
 428         else
 429                 opts_a=""
 430                 opts_b=""
 431         fi
 432
 433         run_cmd ${ns_a} ip link add ${type}_a type ${type} id 1 ${opts_a} remote ${b_addr} ${opts} || return 1
 434         run_cmd ${ns_b} ip link add ${type}_b type ${type} id 1 ${opts_b} remote ${a_addr} ${opts}
 435
 436         run_cmd ${ns_a} ip addr add ${tunnel4_a_addr}/${tunnel4_mask} dev ${type}_a
 437         run_cmd ${ns_b} ip addr add ${tunnel4_b_addr}/${tunnel4_mask} dev ${type}_b
 438
 439         run_cmd ${ns_a} ip addr add ${tunnel6_a_addr}/${tunnel6_mask} dev ${type}_a
 440         run_cmd ${ns_b} ip addr add ${tunnel6_b_addr}/${tunnel6_mask} dev ${type}_b
 441
 442         run_cmd ${ns_a} ip link set ${type}_a up
 443         run_cmd ${ns_b} ip link set ${type}_b up
 444 }
 445
 446 setup_geneve4() {
 447         setup_vxlan_or_geneve geneve ${prefix4}.${a_r1}.1  ${prefix4}.${b_r1}.1  "df set"
 448 }
 449
 450 setup_vxlan4() {
 451         setup_vxlan_or_geneve vxlan  ${prefix4}.${a_r1}.1  ${prefix4}.${b_r1}.1  "df set"
 452 }
 453
 454 setup_geneve6() {
 455         setup_vxlan_or_geneve geneve ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1
 456 }
 457
 458 setup_vxlan6() {
 459         setup_vxlan_or_geneve vxlan  ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1
 460 }
 461
 462 setup_xfrm() {
 463         proto=${1}
 464         veth_a_addr="${2}"
 465         veth_b_addr="${3}"
 466
 467         run_cmd ${ns_a} ip -${proto} xfrm state add src ${veth_a_addr} dst ${veth_b_addr} spi 0x1000 proto esp aead 'rfc4106(gcm(aes))' 0x0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f 128 mode tunnel || return 1
 468         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
 469         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
 470         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
 471
 472         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
 473         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
 474         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
 475         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
 476 }
 477
 478 setup_xfrm4() {
 479         setup_xfrm 4 ${veth4_a_addr} ${veth4_b_addr}
 480 }
 481
 482 setup_xfrm6() {
 483         setup_xfrm 6 ${veth6_a_addr} ${veth6_b_addr}
 484 }
 485
 486 setup_routing_old() {
 487         for i in ${routes}; do
 488                 [ "${ns}" = "" ]        && ns="${i}"            && continue
 489                 [ "${addr}" = "" ]      && addr="${i}"          && continue
 490                 [ "${gw}" = "" ]        && gw="${i}"
 491
 492                 ns_name="$(nsname ${ns})"
 493
 494                 ip -n ${ns_name} route add ${addr} via ${gw}
 495
 496                 ns=""; addr=""; gw=""
 497         done
 498 }
 499
 500 setup_routing_new() {
 501         for i in ${nexthops}; do
 502                 [ "${ns}" = "" ]        && ns="${i}"            && continue
 503                 [ "${fam}" = "" ]       && fam="${i}"           && continue
 504                 [ "${nhid}" = "" ]      && nhid="${i}"          && continue
 505                 [ "${gw}" = "" ]        && gw="${i}"            && continue
 506                 [ "${dev}" = "" ]       && dev="${i}"
 507
 508                 ns_name="$(nsname ${ns})"
 509
 510                 ip -n ${ns_name} -${fam} nexthop add id ${nhid} via ${gw} dev ${dev}
 511
 512                 ns=""; fam=""; nhid=""; gw=""; dev=""
 513
 514         done
 515
 516         for i in ${routes_nh}; do
 517                 [ "${ns}" = "" ]        && ns="${i}"            && continue
 518                 [ "${fam}" = "" ]       && fam="${i}"           && continue
 519                 [ "${addr}" = "" ]      && addr="${i}"          && continue
 520                 [ "${nhid}" = "" ]      && nhid="${i}"
 521
 522                 ns_name="$(nsname ${ns})"
 523
 524                 ip -n ${ns_name} -${fam} route add ${addr} nhid ${nhid}
 525
 526                 ns=""; fam=""; addr=""; nhid=""
 527         done
 528 }
 529
 530 setup_routing() {
 531         for i in ${NS_R1} ${NS_R2}; do
 532                 ip netns exec ${i} sysctl -q net/ipv4/ip_forward=1
 533                 ip netns exec ${i} sysctl -q net/ipv6/conf/all/forwarding=1
 534         done
 535
 536         for i in ${routing_addrs}; do
 537                 [ "${ns}" = "" ]        && ns="${i}"            && continue
 538                 [ "${peer}" = "" ]      && peer="${i}"          && continue
 539                 [ "${segment}" = "" ]   && segment="${i}"
 540
 541                 ns_name="$(nsname ${ns})"
 542                 peer_name="$(nsname ${peer})"
 543                 if="veth_${ns}-${peer}"
 544                 ifpeer="veth_${peer}-${ns}"
 545
 546                 # Create veth links
 547                 ip link add ${if} up netns ${ns_name} type veth peer name ${ifpeer} netns ${peer_name} || return 1
 548                 ip -n ${peer_name} link set dev ${ifpeer} up
 549
 550                 # Add addresses
 551                 ip -n ${ns_name}   addr add ${prefix4}.${segment}.1/24  dev ${if}
 552                 ip -n ${ns_name}   addr add ${prefix6}:${segment}::1/64 dev ${if}
 553
 554                 ip -n ${peer_name} addr add ${prefix4}.${segment}.2/24  dev ${ifpeer}
 555                 ip -n ${peer_name} addr add ${prefix6}:${segment}::2/64 dev ${ifpeer}
 556
 557                 ns=""; peer=""; segment=""
 558         done
 559
 560         if [ "$USE_NH" = "yes" ]; then
 561                 setup_routing_new
 562         else
 563                 setup_routing_old
 564         fi
 565
 566         return 0
 567 }
 568
 569 setup() {
 570         [ "$(id -u)" -ne 0 ] && echo "  need to run as root" && return $ksft_skip
 571
 572         cleanup
 573         for arg do
 574                 eval setup_${arg} || { echo "  ${arg} not supported"; return 1; }
 575         done
 576 }
 577
 578 trace() {
 579         [ $TRACING -eq 0 ] && return
 580
 581         for arg do
 582                 [ "${ns_cmd}" = "" ] && ns_cmd="${arg}" && continue
 583                 ${ns_cmd} tcpdump -s 0 -i "${arg}" -w "${name}_${arg}.pcap" 2> /dev/null &
 584                 tcpdump_pids="${tcpdump_pids} $!"
 585                 ns_cmd=
 586         done
 587         sleep 1
 588 }
 589
 590 cleanup() {
 591         for pid in ${tcpdump_pids}; do
 592                 kill ${pid}
 593         done
 594         tcpdump_pids=
 595
 596         for n in ${NS_A} ${NS_B} ${NS_R1} ${NS_R2}; do
 597                 ip netns del ${n} 2> /dev/null
 598         done
 599 }
 600
 601 mtu() {
 602         ns_cmd="${1}"
 603         dev="${2}"
 604         mtu="${3}"
 605
 606         ${ns_cmd} ip link set dev ${dev} mtu ${mtu}
 607 }
 608
 609 mtu_parse() {
 610         input="${1}"
 611
 612         next=0
 613         for i in ${input}; do
 614                 [ ${next} -eq 1 -a "${i}" = "lock" ] && next=2 && continue
 615                 [ ${next} -eq 1 ] && echo "${i}" && return
 616                 [ ${next} -eq 2 ] && echo "lock ${i}" && return
 617                 [ "${i}" = "mtu" ] && next=1
 618         done
 619 }
 620
 621 link_get() {
 622         ns_cmd="${1}"
 623         name="${2}"
 624
 625         ${ns_cmd} ip link show dev "${name}"
 626 }
 627
 628 link_get_mtu() {
 629         ns_cmd="${1}"
 630         name="${2}"
 631
 632         mtu_parse "$(link_get "${ns_cmd}" ${name})"
 633 }
 634
 635 route_get_dst_exception() {
 636         ns_cmd="${1}"
 637         dst="${2}"
 638
 639         ${ns_cmd} ip route get "${dst}"
 640 }
 641
 642 route_get_dst_pmtu_from_exception() {
 643         ns_cmd="${1}"
 644         dst="${2}"
 645
 646         mtu_parse "$(route_get_dst_exception "${ns_cmd}" ${dst})"
 647 }
 648
 649 check_pmtu_value() {
 650         expected="${1}"
 651         value="${2}"
 652         event="${3}"
 653
 654         [ "${expected}" = "any" ] && [ -n "${value}" ] && return 0
 655         [ "${value}" = "${expected}" ] && return 0
 656         [ -z "${value}" ] &&    err "  PMTU exception wasn't created after ${event}" && return 1
 657         [ -z "${expected}" ] && err "  PMTU exception shouldn't exist after ${event}" && return 1
 658         err "  found PMTU exception with incorrect MTU ${value}, expected ${expected}, after ${event}"
 659         return 1
 660 }
 661
 662 test_pmtu_ipvX() {
 663         family=${1}
 664
 665         setup namespaces routing || return 2
 666         trace "${ns_a}"  veth_A-R1    "${ns_r1}" veth_R1-A \
 667               "${ns_r1}" veth_R1-B    "${ns_b}"  veth_B-R1 \
 668               "${ns_a}"  veth_A-R2    "${ns_r2}" veth_R2-A \
 669               "${ns_r2}" veth_R2-B    "${ns_b}"  veth_B-R2
 670
 671         if [ ${family} -eq 4 ]; then
 672                 ping=ping
 673                 dst1="${prefix4}.${b_r1}.1"
 674                 dst2="${prefix4}.${b_r2}.1"
 675         else
 676                 ping=${ping6}
 677                 dst1="${prefix6}:${b_r1}::1"
 678                 dst2="${prefix6}:${b_r2}::1"
 679         fi
 680
 681         # Set up initial MTU values
 682         mtu "${ns_a}"  veth_A-R1 2000
 683         mtu "${ns_r1}" veth_R1-A 2000
 684         mtu "${ns_r1}" veth_R1-B 1400
 685         mtu "${ns_b}"  veth_B-R1 1400
 686
 687         mtu "${ns_a}"  veth_A-R2 2000
 688         mtu "${ns_r2}" veth_R2-A 2000
 689         mtu "${ns_r2}" veth_R2-B 1500
 690         mtu "${ns_b}"  veth_B-R2 1500
 691
 692         # Create route exceptions
 693         run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1800 ${dst1}
 694         run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1800 ${dst2}
 695
 696         # Check that exceptions have been created with the correct PMTU
 697         pmtu_1="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst1})"
 698         check_pmtu_value "1400" "${pmtu_1}" "exceeding MTU" || return 1
 699         pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})"
 700         check_pmtu_value "1500" "${pmtu_2}" "exceeding MTU" || return 1
 701
 702         # Decrease local MTU below PMTU, check for PMTU decrease in route exception
 703         mtu "${ns_a}"  veth_A-R1 1300
 704         mtu "${ns_r1}" veth_R1-A 1300
 705         pmtu_1="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst1})"
 706         check_pmtu_value "1300" "${pmtu_1}" "decreasing local MTU" || return 1
 707         # Second exception shouldn't be modified
 708         pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})"
 709         check_pmtu_value "1500" "${pmtu_2}" "changing local MTU on a link not on this path" || return 1
 710
 711         # Increase MTU, check for PMTU increase in route exception
 712         mtu "${ns_a}"  veth_A-R1 1700
 713         mtu "${ns_r1}" veth_R1-A 1700
 714         pmtu_1="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst1})"
 715         check_pmtu_value "1700" "${pmtu_1}" "increasing local MTU" || return 1
 716         # Second exception shouldn't be modified
 717         pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})"
 718         check_pmtu_value "1500" "${pmtu_2}" "changing local MTU on a link not on this path" || return 1
 719
 720         # Skip PMTU locking tests for IPv6
 721         [ $family -eq 6 ] && return 0
 722
 723         # Decrease remote MTU on path via R2, get new exception
 724         mtu "${ns_r2}" veth_R2-B 400
 725         mtu "${ns_b}"  veth_B-R2 400
 726         run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1400 ${dst2}
 727         pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})"
 728         check_pmtu_value "lock 552" "${pmtu_2}" "exceeding MTU, with MTU < min_pmtu" || return 1
 729
 730         # Decrease local MTU below PMTU
 731         mtu "${ns_a}"  veth_A-R2 500
 732         mtu "${ns_r2}" veth_R2-A 500
 733         pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})"
 734         check_pmtu_value "500" "${pmtu_2}" "decreasing local MTU" || return 1
 735
 736         # Increase local MTU
 737         mtu "${ns_a}"  veth_A-R2 1500
 738         mtu "${ns_r2}" veth_R2-A 1500
 739         pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})"
 740         check_pmtu_value "1500" "${pmtu_2}" "increasing local MTU" || return 1
 741
 742         # Get new exception
 743         run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1400 ${dst2}
 744         pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})"
 745         check_pmtu_value "lock 552" "${pmtu_2}" "exceeding MTU, with MTU < min_pmtu" || return 1
 746 }
 747
 748 test_pmtu_ipv4_exception() {
 749         test_pmtu_ipvX 4
 750 }
 751
 752 test_pmtu_ipv6_exception() {
 753         test_pmtu_ipvX 6
 754 }
 755
 756 test_pmtu_ipvX_over_vxlanY_or_geneveY_exception() {
 757         type=${1}
 758         family=${2}
 759         outer_family=${3}
 760         ll_mtu=4000
 761
 762         if [ ${outer_family} -eq 4 ]; then
 763                 setup namespaces routing ${type}4 || return 2
 764                 #                      IPv4 header   UDP header   VXLAN/GENEVE header   Ethernet header
 765                 exp_mtu=$((${ll_mtu} - 20          - 8          - 8                   - 14))
 766         else
 767                 setup namespaces routing ${type}6 || return 2
 768                 #                      IPv6 header   UDP header   VXLAN/GENEVE header   Ethernet header
 769                 exp_mtu=$((${ll_mtu} - 40          - 8          - 8                   - 14))
 770         fi
 771
 772         trace "${ns_a}" ${type}_a    "${ns_b}"  ${type}_b \
 773               "${ns_a}" veth_A-R1    "${ns_r1}" veth_R1-A \
 774               "${ns_b}" veth_B-R1    "${ns_r1}" veth_R1-B
 775
 776         if [ ${family} -eq 4 ]; then
 777                 ping=ping
 778                 dst=${tunnel4_b_addr}
 779         else
 780                 ping=${ping6}
 781                 dst=${tunnel6_b_addr}
 782         fi
 783
 784         # Create route exception by exceeding link layer MTU
 785         mtu "${ns_a}"  veth_A-R1 $((${ll_mtu} + 1000))
 786         mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000))
 787         mtu "${ns_b}"  veth_B-R1 ${ll_mtu}
 788         mtu "${ns_r1}" veth_R1-B ${ll_mtu}
 789
 790         mtu "${ns_a}" ${type}_a $((${ll_mtu} + 1000))
 791         mtu "${ns_b}" ${type}_b $((${ll_mtu} + 1000))
 792         run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${dst}
 793
 794         # Check that exception was created
 795         pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst})"
 796         check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on ${type} interface"
 797 }
 798
 799 test_pmtu_ipv4_vxlan4_exception() {
 800         test_pmtu_ipvX_over_vxlanY_or_geneveY_exception vxlan  4 4
 801 }
 802
 803 test_pmtu_ipv6_vxlan4_exception() {
 804         test_pmtu_ipvX_over_vxlanY_or_geneveY_exception vxlan  6 4
 805 }
 806
 807 test_pmtu_ipv4_geneve4_exception() {
 808         test_pmtu_ipvX_over_vxlanY_or_geneveY_exception geneve 4 4
 809 }
 810
 811 test_pmtu_ipv6_geneve4_exception() {
 812         test_pmtu_ipvX_over_vxlanY_or_geneveY_exception geneve 6 4
 813 }
 814
 815 test_pmtu_ipv4_vxlan6_exception() {
 816         test_pmtu_ipvX_over_vxlanY_or_geneveY_exception vxlan  4 6
 817 }
 818
 819 test_pmtu_ipv6_vxlan6_exception() {
 820         test_pmtu_ipvX_over_vxlanY_or_geneveY_exception vxlan  6 6
 821 }
 822
 823 test_pmtu_ipv4_geneve6_exception() {
 824         test_pmtu_ipvX_over_vxlanY_or_geneveY_exception geneve 4 6
 825 }
 826
 827 test_pmtu_ipv6_geneve6_exception() {
 828         test_pmtu_ipvX_over_vxlanY_or_geneveY_exception geneve 6 6
 829 }
 830
 831 test_pmtu_ipvX_over_fouY_or_gueY() {
 832         inner_family=${1}
 833         outer_family=${2}
 834         encap=${3}
 835         ll_mtu=4000
 836
 837         setup namespaces routing ${encap}${outer_family}${inner_family} || return 2
 838         trace "${ns_a}" ${encap}_a   "${ns_b}"  ${encap}_b \
 839               "${ns_a}" veth_A-R1    "${ns_r1}" veth_R1-A \
 840               "${ns_b}" veth_B-R1    "${ns_r1}" veth_R1-B
 841
 842         if [ ${inner_family} -eq 4 ]; then
 843                 ping=ping
 844                 dst=${tunnel4_b_addr}
 845         else
 846                 ping=${ping6}
 847                 dst=${tunnel6_b_addr}
 848         fi
 849
 850         if [ "${encap}" = "gue" ]; then
 851                 encap_overhead=4
 852         else
 853                 encap_overhead=0
 854         fi
 855
 856         if [ ${outer_family} -eq 4 ]; then
 857                 #                      IPv4 header   UDP header
 858                 exp_mtu=$((${ll_mtu} - 20          - 8         - ${encap_overhead}))
 859         else
 860                 #                      IPv6 header   Option 4   UDP header
 861                 exp_mtu=$((${ll_mtu} - 40          - 8        - 8       - ${encap_overhead}))
 862         fi
 863
 864         # Create route exception by exceeding link layer MTU
 865         mtu "${ns_a}"  veth_A-R1 $((${ll_mtu} + 1000))
 866         mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000))
 867         mtu "${ns_b}"  veth_B-R1 ${ll_mtu}
 868         mtu "${ns_r1}" veth_R1-B ${ll_mtu}
 869
 870         mtu "${ns_a}" ${encap}_a $((${ll_mtu} + 1000))
 871         mtu "${ns_b}" ${encap}_b $((${ll_mtu} + 1000))
 872         run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${dst}
 873
 874         # Check that exception was created
 875         pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst})"
 876         check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on ${encap} interface"
 877 }
 878
 879 test_pmtu_ipv4_fou4_exception() {
 880         test_pmtu_ipvX_over_fouY_or_gueY 4 4 fou
 881 }
 882
 883 test_pmtu_ipv6_fou4_exception() {
 884         test_pmtu_ipvX_over_fouY_or_gueY 6 4 fou
 885 }
 886
 887 test_pmtu_ipv4_fou6_exception() {
 888         test_pmtu_ipvX_over_fouY_or_gueY 4 6 fou
 889 }
 890
 891 test_pmtu_ipv6_fou6_exception() {
 892         test_pmtu_ipvX_over_fouY_or_gueY 6 6 fou
 893 }
 894
 895 test_pmtu_ipv4_gue4_exception() {
 896         test_pmtu_ipvX_over_fouY_or_gueY 4 4 gue
 897 }
 898
 899 test_pmtu_ipv6_gue4_exception() {
 900         test_pmtu_ipvX_over_fouY_or_gueY 6 4 gue
 901 }
 902
 903 test_pmtu_ipv4_gue6_exception() {
 904         test_pmtu_ipvX_over_fouY_or_gueY 4 6 gue
 905 }
 906
 907 test_pmtu_ipv6_gue6_exception() {
 908         test_pmtu_ipvX_over_fouY_or_gueY 6 6 gue
 909 }
 910
 911 test_pmtu_vti4_exception() {
 912         setup namespaces veth vti4 xfrm4 || return 2
 913         trace "${ns_a}" veth_a    "${ns_b}" veth_b \
 914               "${ns_a}" vti4_a    "${ns_b}" vti4_b
 915
 916         veth_mtu=1500
 917         vti_mtu=$((veth_mtu - 20))
 918
 919         #                                SPI   SN   IV  ICV   pad length   next header
 920         esp_payload_rfc4106=$((vti_mtu - 4   - 4  - 8 - 16  - 1          - 1))
 921         ping_payload=$((esp_payload_rfc4106 - 28))
 922
 923         mtu "${ns_a}" veth_a ${veth_mtu}
 924         mtu "${ns_b}" veth_b ${veth_mtu}
 925         mtu "${ns_a}" vti4_a ${vti_mtu}
 926         mtu "${ns_b}" vti4_b ${vti_mtu}
 927
 928         # Send DF packet without exceeding link layer MTU, check that no
 929         # exception is created
 930         run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s ${ping_payload} ${tunnel4_b_addr}
 931         pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel4_b_addr})"
 932         check_pmtu_value "" "${pmtu}" "sending packet smaller than PMTU (IP payload length ${esp_payload_rfc4106})" || return 1
 933
 934         # Now exceed link layer MTU by one byte, check that exception is created
 935         # with the right PMTU value
 936         run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s $((ping_payload + 1)) ${tunnel4_b_addr}
 937         pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel4_b_addr})"
 938         check_pmtu_value "${esp_payload_rfc4106}" "${pmtu}" "exceeding PMTU (IP payload length $((esp_payload_rfc4106 + 1)))"
 939 }
 940
 941 test_pmtu_vti6_exception() {
 942         setup namespaces veth vti6 xfrm6 || return 2
 943         trace "${ns_a}" veth_a    "${ns_b}" veth_b \
 944               "${ns_a}" vti6_a    "${ns_b}" vti6_b
 945         fail=0
 946
 947         # Create route exception by exceeding link layer MTU
 948         mtu "${ns_a}" veth_a 4000
 949         mtu "${ns_b}" veth_b 4000
 950         mtu "${ns_a}" vti6_a 5000
 951         mtu "${ns_b}" vti6_b 5000
 952         run_cmd ${ns_a} ${ping6} -q -i 0.1 -w 1 -s 60000 ${tunnel6_b_addr}
 953
 954         # Check that exception was created
 955         pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})"
 956         check_pmtu_value any "${pmtu}" "creating tunnel exceeding link layer MTU" || return 1
 957
 958         # Decrease tunnel MTU, check for PMTU decrease in route exception
 959         mtu "${ns_a}" vti6_a 3000
 960         pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})"
 961         check_pmtu_value "3000" "${pmtu}" "decreasing tunnel MTU" || fail=1
 962
 963         # Increase tunnel MTU, check for PMTU increase in route exception
 964         mtu "${ns_a}" vti6_a 9000
 965         pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})"
 966         check_pmtu_value "9000" "${pmtu}" "increasing tunnel MTU" || fail=1
 967
 968         return ${fail}
 969 }
 970
 971 test_pmtu_vti4_default_mtu() {
 972         setup namespaces veth vti4 || return 2
 973
 974         # Check that MTU of vti device is MTU of veth minus IPv4 header length
 975         veth_mtu="$(link_get_mtu "${ns_a}" veth_a)"
 976         vti4_mtu="$(link_get_mtu "${ns_a}" vti4_a)"
 977         if [ $((veth_mtu - vti4_mtu)) -ne 20 ]; then
 978                 err "  vti MTU ${vti4_mtu} is not veth MTU ${veth_mtu} minus IPv4 header length"
 979                 return 1
 980         fi
 981 }
 982
 983 test_pmtu_vti6_default_mtu() {
 984         setup namespaces veth vti6 || return 2
 985
 986         # Check that MTU of vti device is MTU of veth minus IPv6 header length
 987         veth_mtu="$(link_get_mtu "${ns_a}" veth_a)"
 988         vti6_mtu="$(link_get_mtu "${ns_a}" vti6_a)"
 989         if [ $((veth_mtu - vti6_mtu)) -ne 40 ]; then
 990                 err "  vti MTU ${vti6_mtu} is not veth MTU ${veth_mtu} minus IPv6 header length"
 991                 return 1
 992         fi
 993 }
 994
 995 test_pmtu_vti4_link_add_mtu() {
 996         setup namespaces || return 2
 997
 998         run_cmd ${ns_a} ip link add vti4_a type vti local ${veth4_a_addr} remote ${veth4_b_addr} key 10
 999         [ $? -ne 0 ] && err "  vti not supported" && return 2
1000         run_cmd ${ns_a} ip link del vti4_a
1001
1002         fail=0
1003
1004         min=68
1005         max=$((65535 - 20))
1006         # Check invalid values first
1007         for v in $((min - 1)) $((max + 1)); do
1008                 run_cmd ${ns_a} ip link add vti4_a mtu ${v} type vti local ${veth4_a_addr} remote ${veth4_b_addr} key 10
1009                 # This can fail, or MTU can be adjusted to a proper value
1010                 [ $? -ne 0 ] && continue
1011                 mtu="$(link_get_mtu "${ns_a}" vti4_a)"
1012                 if [ ${mtu} -lt ${min} -o ${mtu} -gt ${max} ]; then
1013                         err "  vti tunnel created with invalid MTU ${mtu}"
1014                         fail=1
1015                 fi
1016                 run_cmd ${ns_a} ip link del vti4_a
1017         done
1018
1019         # Now check valid values
1020         for v in ${min} 1300 ${max}; do
1021                 run_cmd ${ns_a} ip link add vti4_a mtu ${v} type vti local ${veth4_a_addr} remote ${veth4_b_addr} key 10
1022                 mtu="$(link_get_mtu "${ns_a}" vti4_a)"
1023                 run_cmd ${ns_a} ip link del vti4_a
1024                 if [ "${mtu}" != "${v}" ]; then
1025                         err "  vti MTU ${mtu} doesn't match configured value ${v}"
1026                         fail=1
1027                 fi
1028         done
1029
1030         return ${fail}
1031 }
1032
1033 test_pmtu_vti6_link_add_mtu() {
1034         setup namespaces || return 2
1035
1036         run_cmd ${ns_a} ip link add vti6_a type vti6 local ${veth6_a_addr} remote ${veth6_b_addr} key 10
1037         [ $? -ne 0 ] && err "  vti6 not supported" && return 2
1038         run_cmd ${ns_a} ip link del vti6_a
1039
1040         fail=0
1041
1042         min=68                  # vti6 can carry IPv4 packets too
1043         max=$((65535 - 40))
1044         # Check invalid values first
1045         for v in $((min - 1)) $((max + 1)); do
1046                 run_cmd ${ns_a} ip link add vti6_a mtu ${v} type vti6 local ${veth6_a_addr} remote ${veth6_b_addr} key 10
1047                 # This can fail, or MTU can be adjusted to a proper value
1048                 [ $? -ne 0 ] && continue
1049                 mtu="$(link_get_mtu "${ns_a}" vti6_a)"
1050                 if [ ${mtu} -lt ${min} -o ${mtu} -gt ${max} ]; then
1051                         err "  vti6 tunnel created with invalid MTU ${v}"
1052                         fail=1
1053                 fi
1054                 run_cmd ${ns_a} ip link del vti6_a
1055         done
1056
1057         # Now check valid values
1058         for v in 68 1280 1300 $((65535 - 40)); do
1059                 run_cmd ${ns_a} ip link add vti6_a mtu ${v} type vti6 local ${veth6_a_addr} remote ${veth6_b_addr} key 10
1060                 mtu="$(link_get_mtu "${ns_a}" vti6_a)"
1061                 run_cmd ${ns_a} ip link del vti6_a
1062                 if [ "${mtu}" != "${v}" ]; then
1063                         err "  vti6 MTU ${mtu} doesn't match configured value ${v}"
1064                         fail=1
1065                 fi
1066         done
1067
1068         return ${fail}
1069 }
1070
1071 test_pmtu_vti6_link_change_mtu() {
1072         setup namespaces || return 2
1073
1074         run_cmd ${ns_a} ip link add dummy0 mtu 1500 type dummy
1075         [ $? -ne 0 ] && err "  dummy not supported" && return 2
1076         run_cmd ${ns_a} ip link add dummy1 mtu 3000 type dummy
1077         run_cmd ${ns_a} ip link set dummy0 up
1078         run_cmd ${ns_a} ip link set dummy1 up
1079
1080         run_cmd ${ns_a} ip addr add ${dummy6_0_prefix}1/${dummy6_mask} dev dummy0
1081         run_cmd ${ns_a} ip addr add ${dummy6_1_prefix}1/${dummy6_mask} dev dummy1
1082
1083         fail=0
1084
1085         # Create vti6 interface bound to device, passing MTU, check it
1086         run_cmd ${ns_a} ip link add vti6_a mtu 1300 type vti6 remote ${dummy6_0_prefix}2 local ${dummy6_0_prefix}1
1087         mtu="$(link_get_mtu "${ns_a}" vti6_a)"
1088         if [ ${mtu} -ne 1300 ]; then
1089                 err "  vti6 MTU ${mtu} doesn't match configured value 1300"
1090                 fail=1
1091         fi
1092
1093         # Move to another device with different MTU, without passing MTU, check
1094         # MTU is adjusted
1095         run_cmd ${ns_a} ip link set vti6_a type vti6 remote ${dummy6_1_prefix}2 local ${dummy6_1_prefix}1
1096         mtu="$(link_get_mtu "${ns_a}" vti6_a)"
1097         if [ ${mtu} -ne $((3000 - 40)) ]; then
1098                 err "  vti MTU ${mtu} is not dummy MTU 3000 minus IPv6 header length"
1099                 fail=1
1100         fi
1101
1102         # Move it back, passing MTU, check MTU is not overridden
1103         run_cmd ${ns_a} ip link set vti6_a mtu 1280 type vti6 remote ${dummy6_0_prefix}2 local ${dummy6_0_prefix}1
1104         mtu="$(link_get_mtu "${ns_a}" vti6_a)"
1105         if [ ${mtu} -ne 1280 ]; then
1106                 err "  vti6 MTU ${mtu} doesn't match configured value 1280"
1107                 fail=1
1108         fi
1109
1110         return ${fail}
1111 }
1112
1113 check_command() {
1114         cmd=${1}
1115
1116         if ! which ${cmd} > /dev/null 2>&1; then
1117                 err "  missing required command: '${cmd}'"
1118                 return 1
1119         fi
1120         return 0
1121 }
1122
1123 test_cleanup_vxlanX_exception() {
1124         outer="${1}"
1125         encap="vxlan"
1126         ll_mtu=4000
1127
1128         check_command taskset || return 2
1129         cpu_list=$(grep -m 2 processor /proc/cpuinfo | cut -d ' ' -f 2)
1130
1131         setup namespaces routing ${encap}${outer} || return 2
1132         trace "${ns_a}" ${encap}_a   "${ns_b}"  ${encap}_b \
1133               "${ns_a}" veth_A-R1    "${ns_r1}" veth_R1-A \
1134               "${ns_b}" veth_B-R1    "${ns_r1}" veth_R1-B
1135
1136         # Create route exception by exceeding link layer MTU
1137         mtu "${ns_a}"  veth_A-R1 $((${ll_mtu} + 1000))
1138         mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000))
1139         mtu "${ns_b}"  veth_B-R1 ${ll_mtu}
1140         mtu "${ns_r1}" veth_R1-B ${ll_mtu}
1141
1142         mtu "${ns_a}" ${encap}_a $((${ll_mtu} + 1000))
1143         mtu "${ns_b}" ${encap}_b $((${ll_mtu} + 1000))
1144
1145         # Fill exception cache for multiple CPUs (2)
1146         # we can always use inner IPv4 for that
1147         for cpu in ${cpu_list}; do
1148                 run_cmd taskset --cpu-list ${cpu} ${ns_a} ping -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${tunnel4_b_addr}
1149         done
1150
1151         ${ns_a} ip link del dev veth_A-R1 &
1152         iplink_pid=$!
1153         sleep 1
1154         if [ "$(cat /proc/${iplink_pid}/cmdline 2>/dev/null | tr -d '\0')" = "iplinkdeldevveth_A-R1" ]; then
1155                 err "  can't delete veth device in a timely manner, PMTU dst likely leaked"
1156                 return 1
1157         fi
1158 }
1159
1160 test_cleanup_ipv6_exception() {
1161         test_cleanup_vxlanX_exception 6
1162 }
1163
1164 test_cleanup_ipv4_exception() {
1165         test_cleanup_vxlanX_exception 4
1166 }
1167
1168 run_test() {
1169         (
1170         tname="$1"
1171         tdesc="$2"
1172
1173         unset IFS
1174
1175         if [ "$VERBOSE" = "1" ]; then
1176                 printf "\n##########################################################################\n\n"
1177         fi
1178
1179         eval test_${tname}
1180         ret=$?
1181
1182         if [ $ret -eq 0 ]; then
1183                 printf "TEST: %-60s  [ OK ]\n" "${tdesc}"
1184         elif [ $ret -eq 1 ]; then
1185                 printf "TEST: %-60s  [FAIL]\n" "${tdesc}"
1186                 if [ "${PAUSE_ON_FAIL}" = "yes" ]; then
1187                         echo
1188                         echo "Pausing. Hit enter to continue"
1189                         read a
1190                 fi
1191                 err_flush
1192                 exit 1
1193         elif [ $ret -eq 2 ]; then
1194                 printf "TEST: %-60s  [SKIP]\n" "${tdesc}"
1195                 err_flush
1196         fi
1197
1198         return $ret
1199         )
1200         ret=$?
1201         [ $ret -ne 0 ] && exitcode=1
1202
1203         return $ret
1204 }
1205
1206 run_test_nh() {
1207         tname="$1"
1208         tdesc="$2"
1209
1210         USE_NH=yes
1211         run_test "${tname}" "${tdesc} - nexthop objects"
1212         USE_NH=no
1213 }
1214
1215 test_list_flush_ipv4_exception() {
1216         setup namespaces routing || return 2
1217         trace "${ns_a}"  veth_A-R1    "${ns_r1}" veth_R1-A \
1218               "${ns_r1}" veth_R1-B    "${ns_b}"  veth_B-R1 \
1219               "${ns_a}"  veth_A-R2    "${ns_r2}" veth_R2-A \
1220               "${ns_r2}" veth_R2-B    "${ns_b}"  veth_B-R2
1221
1222         dst_prefix1="${prefix4}.${b_r1}."
1223         dst2="${prefix4}.${b_r2}.1"
1224
1225         # Set up initial MTU values
1226         mtu "${ns_a}"  veth_A-R1 2000
1227         mtu "${ns_r1}" veth_R1-A 2000
1228         mtu "${ns_r1}" veth_R1-B 1500
1229         mtu "${ns_b}"  veth_B-R1 1500
1230
1231         mtu "${ns_a}"  veth_A-R2 2000
1232         mtu "${ns_r2}" veth_R2-A 2000
1233         mtu "${ns_r2}" veth_R2-B 1500
1234         mtu "${ns_b}"  veth_B-R2 1500
1235
1236         fail=0
1237
1238         # Add 100 addresses for veth endpoint on B reached by default A route
1239         for i in $(seq 100 199); do
1240                 run_cmd ${ns_b} ip addr add "${dst_prefix1}${i}" dev veth_B-R1
1241         done
1242
1243         # Create 100 cached route exceptions for path via R1, one via R2. Note
1244         # that with IPv4 we need to actually cause a route lookup that matches
1245         # the exception caused by ICMP, in order to actually have a cached
1246         # route, so we need to ping each destination twice
1247         for i in $(seq 100 199); do
1248                 run_cmd ${ns_a} ping -q -M want -i 0.1 -c 2 -s 1800 "${dst_prefix1}${i}"
1249         done
1250         run_cmd ${ns_a} ping -q -M want -i 0.1 -c 2 -s 1800 "${dst2}"
1251
1252         if [ "$(${ns_a} ip -oneline route list cache | wc -l)" -ne 101 ]; then
1253                 err "  can't list cached exceptions"
1254                 fail=1
1255         fi
1256
1257         run_cmd ${ns_a} ip route flush cache
1258         pmtu1="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst_prefix}1)"
1259         pmtu2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst_prefix}2)"
1260         if [ -n "${pmtu1}" ] || [ -n "${pmtu2}" ] || \
1261            [ -n "$(${ns_a} ip route list cache)" ]; then
1262                 err "  can't flush cached exceptions"
1263                 fail=1
1264         fi
1265
1266         return ${fail}
1267 }
1268
1269 test_list_flush_ipv6_exception() {
1270         setup namespaces routing || return 2
1271         trace "${ns_a}"  veth_A-R1    "${ns_r1}" veth_R1-A \
1272               "${ns_r1}" veth_R1-B    "${ns_b}"  veth_B-R1 \
1273               "${ns_a}"  veth_A-R2    "${ns_r2}" veth_R2-A \
1274               "${ns_r2}" veth_R2-B    "${ns_b}"  veth_B-R2
1275
1276         dst_prefix1="${prefix6}:${b_r1}::"
1277         dst2="${prefix6}:${b_r2}::1"
1278
1279         # Set up initial MTU values
1280         mtu "${ns_a}"  veth_A-R1 2000
1281         mtu "${ns_r1}" veth_R1-A 2000
1282         mtu "${ns_r1}" veth_R1-B 1500
1283         mtu "${ns_b}"  veth_B-R1 1500
1284
1285         mtu "${ns_a}"  veth_A-R2 2000
1286         mtu "${ns_r2}" veth_R2-A 2000
1287         mtu "${ns_r2}" veth_R2-B 1500
1288         mtu "${ns_b}"  veth_B-R2 1500
1289
1290         fail=0
1291
1292         # Add 100 addresses for veth endpoint on B reached by default A route
1293         for i in $(seq 100 199); do
1294                 run_cmd ${ns_b} ip addr add "${dst_prefix1}${i}" dev veth_B-R1
1295         done
1296
1297         # Create 100 cached route exceptions for path via R1, one via R2
1298         for i in $(seq 100 199); do
1299                 run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s 1800 "${dst_prefix1}${i}"
1300         done
1301         run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s 1800 "${dst2}"
1302         if [ "$(${ns_a} ip -oneline -6 route list cache | wc -l)" -ne 101 ]; then
1303                 err "  can't list cached exceptions"
1304                 fail=1
1305         fi
1306
1307         run_cmd ${ns_a} ip -6 route flush cache
1308         pmtu1="$(route_get_dst_pmtu_from_exception "${ns_a}" "${dst_prefix1}100")"
1309         pmtu2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})"
1310         if [ -n "${pmtu1}" ] || [ -n "${pmtu2}" ] || \
1311            [ -n "$(${ns_a} ip -6 route list cache)" ]; then
1312                 err "  can't flush cached exceptions"
1313                 fail=1
1314         fi
1315
1316         return ${fail}
1317 }
1318
1319 usage() {
1320         echo
1321         echo "$0 [OPTIONS] [TEST]..."
1322         echo "If no TEST argument is given, all tests will be run."
1323         echo
1324         echo "Options"
1325         echo "  --trace: capture traffic to TEST_INTERFACE.pcap"
1326         echo
1327         echo "Available tests${tests}"
1328         exit 1
1329 }
1330
1331 ################################################################################
1332 #
1333 exitcode=0
1334 desc=0
1335
1336 while getopts :ptv o
1337 do
1338         case $o in
1339         p) PAUSE_ON_FAIL=yes;;
1340         v) VERBOSE=1;;
1341         t) if which tcpdump > /dev/null 2>&1; then
1342                 TRACING=1
1343            else
1344                 echo "=== tcpdump not available, tracing disabled"
1345            fi
1346            ;;
1347         *) usage;;
1348         esac
1349 done
1350 shift $(($OPTIND-1))
1351
1352 IFS="
1353 "
1354
1355 for arg do
1356         # Check first that all requested tests are available before running any
1357         command -v > /dev/null "test_${arg}" || { echo "=== Test ${arg} not found"; usage; }
1358 done
1359
1360 trap cleanup EXIT
1361
1362 # start clean
1363 cleanup
1364
1365 HAVE_NH=no
1366 ip nexthop ls >/dev/null 2>&1
1367 [ $? -eq 0 ] && HAVE_NH=yes
1368
1369 name=""
1370 desc=""
1371 rerun_nh=0
1372 for t in ${tests}; do
1373         [ "${name}" = "" ]      && name="${t}"  && continue
1374         [ "${desc}" = "" ]      && desc="${t}"  && continue
1375
1376         if [ "${HAVE_NH}" = "yes" ]; then
1377                 rerun_nh="${t}"
1378         fi
1379
1380         run_this=1
1381         for arg do
1382                 [ "${arg}" != "${arg#--*}" ] && continue
1383                 [ "${arg}" = "${name}" ] && run_this=1 && break
1384                 run_this=0
1385         done
1386         if [ $run_this -eq 1 ]; then
1387                 run_test "${name}" "${desc}"
1388                 # if test was skipped no need to retry with nexthop objects
1389                 [ $? -eq 2 ] && rerun_nh=0
1390
1391                 if [ "${rerun_nh}" = "1" ]; then
1392                         run_test_nh "${name}" "${desc}"
1393                 fi
1394         fi
1395         name=""
1396         desc=""
1397         rerun_nh=0
1398 done
1399
1400 exit ${exitcode}