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diff --git a/tools/testing/selftests/net/pmtu.sh b/tools/testing/selftests/net/pmtu.sh
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+#!/bin/sh
+# SPDX-License-Identifier: GPL-2.0
+#
+# Check that route PMTU values match expectations, and that initial device MTU
+# values are assigned correctly
+#
+# Tests currently implemented:
+#
+# - pmtu_ipv4
+# Set up two namespaces, A and B, with two paths between them over routers
+# R1 and R2 (also implemented with namespaces), with different MTUs:
+#
+# segment a_r1 segment b_r1 a_r1: 2000
+# .--------------R1--------------. b_r1: 1400
+# A B a_r2: 2000
+# '--------------R2--------------' b_r2: 1500
+# segment a_r2 segment b_r2
+#
+# Check that PMTU exceptions with the correct PMTU are created. Then
+# decrease and increase the MTU of the local link for one of the paths,
+# A to R1, checking that route exception PMTU changes accordingly over
+# this path. Also check that locked exceptions are created when an ICMP
+# message advertising a PMTU smaller than net.ipv4.route.min_pmtu is
+# received
+#
+# - pmtu_ipv6
+# Same as pmtu_ipv4, except for locked PMTU tests, using IPv6
+#
+# - pmtu_ipv4_vxlan4_exception
+# Set up the same network topology as pmtu_ipv4, create a VXLAN tunnel
+# over IPv4 between A and B, routed via R1. On the link between R1 and B,
+# set a MTU lower than the VXLAN MTU and the MTU on the link between A and
+# R1. Send IPv4 packets, exceeding the MTU between R1 and B, over VXLAN
+# from A to B and check that the PMTU exception is created with the right
+# value on A
+#
+# - pmtu_ipv6_vxlan4_exception
+# Same as pmtu_ipv4_vxlan4_exception, but send IPv6 packets from A to B
+#
+# - pmtu_ipv4_vxlan6_exception
+# Same as pmtu_ipv4_vxlan4_exception, but use IPv6 transport from A to B
+#
+# - pmtu_ipv6_vxlan6_exception
+# Same as pmtu_ipv4_vxlan6_exception, but send IPv6 packets from A to B
+#
+# - pmtu_ipv4_geneve4_exception
+# Same as pmtu_ipv4_vxlan4_exception, but using a GENEVE tunnel instead of
+# VXLAN
+#
+# - pmtu_ipv6_geneve4_exception
+# Same as pmtu_ipv6_vxlan4_exception, but using a GENEVE tunnel instead of
+# VXLAN
+#
+# - pmtu_ipv4_geneve6_exception
+# Same as pmtu_ipv4_vxlan6_exception, but using a GENEVE tunnel instead of
+# VXLAN
+#
+# - pmtu_ipv6_geneve6_exception
+# Same as pmtu_ipv6_vxlan6_exception, but using a GENEVE tunnel instead of
+# VXLAN
+#
+# - pmtu_ipv{4,6}_br_vxlan{4,6}_exception
+# Set up three namespaces, A, B, and C, with routing between A and B over
+# R1. R2 is unused in these tests. A has a veth connection to C, and is
+# connected to B via a VXLAN endpoint, which is directly bridged to C.
+# MTU on the B-R1 link is lower than other MTUs.
+#
+# Check that both C and A are able to communicate with B over the VXLAN
+# tunnel, and that PMTU exceptions with the correct values are created.
+#
+# segment a_r1 segment b_r1 b_r1: 4000
+# .--------------R1--------------. everything
+# C---veth A B else: 5000
+# ' bridge |
+# '---- - - - - - VXLAN - - - - - - - '
+#
+# - pmtu_ipv{4,6}_br_geneve{4,6}_exception
+# Same as pmtu_ipv{4,6}_br_vxlan{4,6}_exception, with a GENEVE tunnel
+# instead.
+#
+# - pmtu_ipv{4,6}_ovs_vxlan{4,6}_exception
+# Set up two namespaces, B, and C, with routing between the init namespace
+# and B over R1. A and R2 are unused in these tests. The init namespace
+# has a veth connection to C, and is connected to B via a VXLAN endpoint,
+# which is handled by Open vSwitch and bridged to C. MTU on the B-R1 link
+# is lower than other MTUs.
+#
+# Check that C is able to communicate with B over the VXLAN tunnel, and
+# that PMTU exceptions with the correct values are created.
+#
+# segment a_r1 segment b_r1 b_r1: 4000
+# .--------------R1--------------. everything
+# C---veth init B else: 5000
+# '- ovs |
+# '---- - - - - - VXLAN - - - - - - - '
+#
+# - pmtu_ipv{4,6}_ovs_geneve{4,6}_exception
+# Same as pmtu_ipv{4,6}_ovs_vxlan{4,6}_exception, with a GENEVE tunnel
+# instead.
+#
+# - pmtu_ipv{4,6}_fou{4,6}_exception
+# Same as pmtu_ipv4_vxlan4, but using a direct IPv4/IPv6 encapsulation
+# (FoU) over IPv4/IPv6, instead of VXLAN
+#
+# - pmtu_ipv{4,6}_fou{4,6}_exception
+# Same as pmtu_ipv4_vxlan4, but using a generic UDP IPv4/IPv6
+# encapsulation (GUE) over IPv4/IPv6, instead of VXLAN
+#
+# - pmtu_ipv{4,6}_ipv{4,6}_exception
+# Same as pmtu_ipv4_vxlan4, but using a IPv4/IPv6 tunnel over IPv4/IPv6,
+# instead of VXLAN
+#
+# - pmtu_vti4_exception
+# Set up vti tunnel on top of veth, with xfrm states and policies, in two
+# namespaces with matching endpoints. Check that route exception is not
+# created if link layer MTU is not exceeded, then exceed it and check that
+# exception is created with the expected PMTU. The approach described
+# below for IPv6 doesn't apply here, because, on IPv4, administrative MTU
+# changes alone won't affect PMTU
+#
+# - pmtu_vti6_exception
+# Set up vti6 tunnel on top of veth, with xfrm states and policies, in two
+# namespaces with matching endpoints. Check that route exception is
+# created by exceeding link layer MTU with ping to other endpoint. Then
+# decrease and increase MTU of tunnel, checking that route exception PMTU
+# changes accordingly
+#
+# - pmtu_vti4_default_mtu
+# Set up vti4 tunnel on top of veth, in two namespaces with matching
+# endpoints. Check that MTU assigned to vti interface is the MTU of the
+# lower layer (veth) minus additional lower layer headers (zero, for veth)
+# minus IPv4 header length
+#
+# - pmtu_vti6_default_mtu
+# Same as above, for IPv6
+#
+# - pmtu_vti4_link_add_mtu
+# Set up vti4 interface passing MTU value at link creation, check MTU is
+# configured, and that link is not created with invalid MTU values
+#
+# - pmtu_vti6_link_add_mtu
+# Same as above, for IPv6
+#
+# - pmtu_vti6_link_change_mtu
+# Set up two dummy interfaces with different MTUs, create a vti6 tunnel
+# and check that configured MTU is used on link creation and changes, and
+# that MTU is properly calculated instead when MTU is not configured from
+# userspace
+#
+# - cleanup_ipv4_exception
+# Similar to pmtu_ipv4_vxlan4_exception, but explicitly generate PMTU
+# exceptions on multiple CPUs and check that the veth device tear-down
+# happens in a timely manner
+#
+# - cleanup_ipv6_exception
+# Same as above, but use IPv6 transport from A to B
+#
+# - list_flush_ipv4_exception
+# Using the same topology as in pmtu_ipv4, create exceptions, and check
+# they are shown when listing exception caches, gone after flushing them
+#
+# - list_flush_ipv6_exception
+# Using the same topology as in pmtu_ipv6, create exceptions, and check
+# they are shown when listing exception caches, gone after flushing them
+#
+# - pmtu_ipv4_route_change
+# Use the same topology as in pmtu_ipv4, but issue a route replacement
+# command and delete the corresponding device afterward. This tests for
+# proper cleanup of the PMTU exceptions by the route replacement path.
+# Device unregistration should complete successfully
+#
+# - pmtu_ipv6_route_change
+# Same as above but with IPv6
+
+# Kselftest framework requirement - SKIP code is 4.
+ksft_skip=4
+
+PAUSE_ON_FAIL=no
+VERBOSE=0
+TRACING=0
+
+# Some systems don't have a ping6 binary anymore
+which ping6 > /dev/null 2>&1 && ping6=$(which ping6) || ping6=$(which ping)
+
+# Name Description re-run with nh
+tests="
+ pmtu_ipv4_exception ipv4: PMTU exceptions 1
+ pmtu_ipv6_exception ipv6: PMTU exceptions 1
+ pmtu_ipv4_vxlan4_exception IPv4 over vxlan4: PMTU exceptions 1
+ pmtu_ipv6_vxlan4_exception IPv6 over vxlan4: PMTU exceptions 1
+ pmtu_ipv4_vxlan6_exception IPv4 over vxlan6: PMTU exceptions 1
+ pmtu_ipv6_vxlan6_exception IPv6 over vxlan6: PMTU exceptions 1
+ pmtu_ipv4_geneve4_exception IPv4 over geneve4: PMTU exceptions 1
+ pmtu_ipv6_geneve4_exception IPv6 over geneve4: PMTU exceptions 1
+ pmtu_ipv4_geneve6_exception IPv4 over geneve6: PMTU exceptions 1
+ pmtu_ipv6_geneve6_exception IPv6 over geneve6: PMTU exceptions 1
+ pmtu_ipv4_br_vxlan4_exception IPv4, bridged vxlan4: PMTU exceptions 1
+ pmtu_ipv6_br_vxlan4_exception IPv6, bridged vxlan4: PMTU exceptions 1
+ pmtu_ipv4_br_vxlan6_exception IPv4, bridged vxlan6: PMTU exceptions 1
+ pmtu_ipv6_br_vxlan6_exception IPv6, bridged vxlan6: PMTU exceptions 1
+ pmtu_ipv4_br_geneve4_exception IPv4, bridged geneve4: PMTU exceptions 1
+ pmtu_ipv6_br_geneve4_exception IPv6, bridged geneve4: PMTU exceptions 1
+ pmtu_ipv4_br_geneve6_exception IPv4, bridged geneve6: PMTU exceptions 1
+ pmtu_ipv6_br_geneve6_exception IPv6, bridged geneve6: PMTU exceptions 1
+ pmtu_ipv4_ovs_vxlan4_exception IPv4, OVS vxlan4: PMTU exceptions 1
+ pmtu_ipv6_ovs_vxlan4_exception IPv6, OVS vxlan4: PMTU exceptions 1
+ pmtu_ipv4_ovs_vxlan6_exception IPv4, OVS vxlan6: PMTU exceptions 1
+ pmtu_ipv6_ovs_vxlan6_exception IPv6, OVS vxlan6: PMTU exceptions 1
+ pmtu_ipv4_ovs_geneve4_exception IPv4, OVS geneve4: PMTU exceptions 1
+ pmtu_ipv6_ovs_geneve4_exception IPv6, OVS geneve4: PMTU exceptions 1
+ pmtu_ipv4_ovs_geneve6_exception IPv4, OVS geneve6: PMTU exceptions 1
+ pmtu_ipv6_ovs_geneve6_exception IPv6, OVS geneve6: PMTU exceptions 1
+ pmtu_ipv4_fou4_exception IPv4 over fou4: PMTU exceptions 1
+ pmtu_ipv6_fou4_exception IPv6 over fou4: PMTU exceptions 1
+ pmtu_ipv4_fou6_exception IPv4 over fou6: PMTU exceptions 1
+ pmtu_ipv6_fou6_exception IPv6 over fou6: PMTU exceptions 1
+ pmtu_ipv4_gue4_exception IPv4 over gue4: PMTU exceptions 1
+ pmtu_ipv6_gue4_exception IPv6 over gue4: PMTU exceptions 1
+ pmtu_ipv4_gue6_exception IPv4 over gue6: PMTU exceptions 1
+ pmtu_ipv6_gue6_exception IPv6 over gue6: PMTU exceptions 1
+ pmtu_ipv4_ipv4_exception IPv4 over IPv4: PMTU exceptions 1
+ pmtu_ipv6_ipv4_exception IPv6 over IPv4: PMTU exceptions 1
+ pmtu_ipv4_ipv6_exception IPv4 over IPv6: PMTU exceptions 1
+ pmtu_ipv6_ipv6_exception IPv6 over IPv6: PMTU exceptions 1
+ pmtu_vti6_exception vti6: PMTU exceptions 0
+ pmtu_vti4_exception vti4: PMTU exceptions 0
+ pmtu_vti4_default_mtu vti4: default MTU assignment 0
+ pmtu_vti6_default_mtu vti6: default MTU assignment 0
+ pmtu_vti4_link_add_mtu vti4: MTU setting on link creation 0
+ pmtu_vti6_link_add_mtu vti6: MTU setting on link creation 0
+ pmtu_vti6_link_change_mtu vti6: MTU changes on link changes 0
+ cleanup_ipv4_exception ipv4: cleanup of cached exceptions 1
+ cleanup_ipv6_exception ipv6: cleanup of cached exceptions 1
+ list_flush_ipv4_exception ipv4: list and flush cached exceptions 1
+ list_flush_ipv6_exception ipv6: list and flush cached exceptions 1
+ pmtu_ipv4_route_change ipv4: PMTU exception w/route replace 1
+ pmtu_ipv6_route_change ipv6: PMTU exception w/route replace 1"
+
+NS_A="ns-A"
+NS_B="ns-B"
+NS_C="ns-C"
+NS_R1="ns-R1"
+NS_R2="ns-R2"
+ns_a="ip netns exec ${NS_A}"
+ns_b="ip netns exec ${NS_B}"
+ns_c="ip netns exec ${NS_C}"
+ns_r1="ip netns exec ${NS_R1}"
+ns_r2="ip netns exec ${NS_R2}"
+
+# Addressing and routing for tests with routers: four network segments, with
+# index SEGMENT between 1 and 4, a common prefix (PREFIX4 or PREFIX6) and an
+# identifier ID, which is 1 for hosts (A and B), 2 for routers (R1 and R2).
+# Addresses are:
+# - IPv4: PREFIX4.SEGMENT.ID (/24)
+# - IPv6: PREFIX6:SEGMENT::ID (/64)
+prefix4="10.0"
+prefix6="fc00"
+a_r1=1
+a_r2=2
+b_r1=3
+b_r2=4
+# ns peer segment
+routing_addrs="
+ A R1 ${a_r1}
+ A R2 ${a_r2}
+ B R1 ${b_r1}
+ B R2 ${b_r2}
+"
+# Traffic from A to B goes through R1 by default, and through R2, if destined to
+# B's address on the b_r2 segment.
+# Traffic from B to A goes through R1.
+# ns destination gateway
+routes="
+ A default ${prefix4}.${a_r1}.2
+ A ${prefix4}.${b_r2}.1 ${prefix4}.${a_r2}.2
+ B default ${prefix4}.${b_r1}.2
+
+ A default ${prefix6}:${a_r1}::2
+ A ${prefix6}:${b_r2}::1 ${prefix6}:${a_r2}::2
+ B default ${prefix6}:${b_r1}::2
+"
+
+USE_NH="no"
+# ns family nh id destination gateway
+nexthops="
+ A 4 41 ${prefix4}.${a_r1}.2 veth_A-R1
+ A 4 42 ${prefix4}.${a_r2}.2 veth_A-R2
+ B 4 41 ${prefix4}.${b_r1}.2 veth_B-R1
+
+ A 6 61 ${prefix6}:${a_r1}::2 veth_A-R1
+ A 6 62 ${prefix6}:${a_r2}::2 veth_A-R2
+ B 6 61 ${prefix6}:${b_r1}::2 veth_B-R1
+"
+
+# nexthop id correlates to id in nexthops config above
+# ns family prefix nh id
+routes_nh="
+ A 4 default 41
+ A 4 ${prefix4}.${b_r2}.1 42
+ B 4 default 41
+
+ A 6 default 61
+ A 6 ${prefix6}:${b_r2}::1 62
+ B 6 default 61
+"
+
+veth4_a_addr="192.168.1.1"
+veth4_b_addr="192.168.1.2"
+veth4_c_addr="192.168.2.10"
+veth4_mask="24"
+veth6_a_addr="fd00:1::a"
+veth6_b_addr="fd00:1::b"
+veth6_c_addr="fd00:2::c"
+veth6_mask="64"
+
+tunnel4_a_addr="192.168.2.1"
+tunnel4_b_addr="192.168.2.2"
+tunnel4_mask="24"
+tunnel6_a_addr="fd00:2::a"
+tunnel6_b_addr="fd00:2::b"
+tunnel6_mask="64"
+
+dummy6_0_prefix="fc00:1000::"
+dummy6_1_prefix="fc00:1001::"
+dummy6_mask="64"
+
+err_buf=
+tcpdump_pids=
+
+err() {
+ err_buf="${err_buf}${1}
+"
+}
+
+err_flush() {
+ echo -n "${err_buf}"
+ err_buf=
+}
+
+run_cmd() {
+ cmd="$*"
+
+ if [ "$VERBOSE" = "1" ]; then
+ printf " COMMAND: $cmd\n"
+ fi
+
+ out="$($cmd 2>&1)"
+ rc=$?
+ if [ "$VERBOSE" = "1" -a -n "$out" ]; then
+ echo " $out"
+ echo
+ fi
+
+ return $rc
+}
+
+# Find the auto-generated name for this namespace
+nsname() {
+ eval echo \$NS_$1
+}
+
+setup_fou_or_gue() {
+ outer="${1}"
+ inner="${2}"
+ encap="${3}"
+
+ if [ "${outer}" = "4" ]; then
+ modprobe fou || return 2
+ a_addr="${prefix4}.${a_r1}.1"
+ b_addr="${prefix4}.${b_r1}.1"
+ if [ "${inner}" = "4" ]; then
+ type="ipip"
+ ipproto="4"
+ else
+ type="sit"
+ ipproto="41"
+ fi
+ else
+ modprobe fou6 || return 2
+ a_addr="${prefix6}:${a_r1}::1"
+ b_addr="${prefix6}:${b_r1}::1"
+ if [ "${inner}" = "4" ]; then
+ type="ip6tnl"
+ mode="mode ipip6"
+ ipproto="4 -6"
+ else
+ type="ip6tnl"
+ mode="mode ip6ip6"
+ ipproto="41 -6"
+ fi
+ fi
+
+ run_cmd ${ns_a} ip fou add port 5555 ipproto ${ipproto} || return 2
+ 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
+
+ run_cmd ${ns_b} ip fou add port 5556 ipproto ${ipproto}
+ run_cmd ${ns_b} ip link add ${encap}_b type ${type} ${mode} local ${b_addr} remote ${a_addr} encap ${encap} encap-sport auto encap-dport 5555
+
+ if [ "${inner}" = "4" ]; then
+ run_cmd ${ns_a} ip addr add ${tunnel4_a_addr}/${tunnel4_mask} dev ${encap}_a
+ run_cmd ${ns_b} ip addr add ${tunnel4_b_addr}/${tunnel4_mask} dev ${encap}_b
+ else
+ run_cmd ${ns_a} ip addr add ${tunnel6_a_addr}/${tunnel6_mask} dev ${encap}_a
+ run_cmd ${ns_b} ip addr add ${tunnel6_b_addr}/${tunnel6_mask} dev ${encap}_b
+ fi
+
+ run_cmd ${ns_a} ip link set ${encap}_a up
+ run_cmd ${ns_b} ip link set ${encap}_b up
+}
+
+setup_fou44() {
+ setup_fou_or_gue 4 4 fou
+}
+
+setup_fou46() {
+ setup_fou_or_gue 4 6 fou
+}
+
+setup_fou64() {
+ setup_fou_or_gue 6 4 fou
+}
+
+setup_fou66() {
+ setup_fou_or_gue 6 6 fou
+}
+
+setup_gue44() {
+ setup_fou_or_gue 4 4 gue
+}
+
+setup_gue46() {
+ setup_fou_or_gue 4 6 gue
+}
+
+setup_gue64() {
+ setup_fou_or_gue 6 4 gue
+}
+
+setup_gue66() {
+ setup_fou_or_gue 6 6 gue
+}
+
+setup_ipvX_over_ipvY() {
+ inner=${1}
+ outer=${2}
+
+ if [ "${outer}" -eq 4 ]; then
+ a_addr="${prefix4}.${a_r1}.1"
+ b_addr="${prefix4}.${b_r1}.1"
+ if [ "${inner}" -eq 4 ]; then
+ type="ipip"
+ mode="ipip"
+ else
+ type="sit"
+ mode="ip6ip"
+ fi
+ else
+ a_addr="${prefix6}:${a_r1}::1"
+ b_addr="${prefix6}:${b_r1}::1"
+ type="ip6tnl"
+ if [ "${inner}" -eq 4 ]; then
+ mode="ipip6"
+ else
+ mode="ip6ip6"
+ fi
+ fi
+
+ run_cmd ${ns_a} ip link add ip_a type ${type} local ${a_addr} remote ${b_addr} mode ${mode} || return 2
+ run_cmd ${ns_b} ip link add ip_b type ${type} local ${b_addr} remote ${a_addr} mode ${mode}
+
+ run_cmd ${ns_a} ip link set ip_a up
+ run_cmd ${ns_b} ip link set ip_b up
+
+ if [ "${inner}" = "4" ]; then
+ run_cmd ${ns_a} ip addr add ${tunnel4_a_addr}/${tunnel4_mask} dev ip_a
+ run_cmd ${ns_b} ip addr add ${tunnel4_b_addr}/${tunnel4_mask} dev ip_b
+ else
+ run_cmd ${ns_a} ip addr add ${tunnel6_a_addr}/${tunnel6_mask} dev ip_a
+ run_cmd ${ns_b} ip addr add ${tunnel6_b_addr}/${tunnel6_mask} dev ip_b
+ fi
+}
+
+setup_ip4ip4() {
+ setup_ipvX_over_ipvY 4 4
+}
+
+setup_ip6ip4() {
+ setup_ipvX_over_ipvY 6 4
+}
+
+setup_ip4ip6() {
+ setup_ipvX_over_ipvY 4 6
+}
+
+setup_ip6ip6() {
+ setup_ipvX_over_ipvY 6 6
+}
+
+setup_namespaces() {
+ for n in ${NS_A} ${NS_B} ${NS_C} ${NS_R1} ${NS_R2}; do
+ ip netns add ${n} || return 1
+
+ # Disable DAD, so that we don't have to wait to use the
+ # configured IPv6 addresses
+ ip netns exec ${n} sysctl -q net/ipv6/conf/default/accept_dad=0
+ done
+}
+
+setup_veth() {
+ run_cmd ${ns_a} ip link add veth_a type veth peer name veth_b || return 1
+ run_cmd ${ns_a} ip link set veth_b netns ${NS_B}
+
+ run_cmd ${ns_a} ip addr add ${veth4_a_addr}/${veth4_mask} dev veth_a
+ run_cmd ${ns_b} ip addr add ${veth4_b_addr}/${veth4_mask} dev veth_b
+
+ run_cmd ${ns_a} ip addr add ${veth6_a_addr}/${veth6_mask} dev veth_a
+ run_cmd ${ns_b} ip addr add ${veth6_b_addr}/${veth6_mask} dev veth_b
+
+ run_cmd ${ns_a} ip link set veth_a up
+ run_cmd ${ns_b} ip link set veth_b up
+}
+
+setup_vti() {
+ proto=${1}
+ veth_a_addr="${2}"
+ veth_b_addr="${3}"
+ vti_a_addr="${4}"
+ vti_b_addr="${5}"
+ vti_mask=${6}
+
+ [ ${proto} -eq 6 ] && vti_type="vti6" || vti_type="vti"
+
+ 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
+ run_cmd ${ns_b} ip link add vti${proto}_b type ${vti_type} local ${veth_b_addr} remote ${veth_a_addr} key 10
+
+ run_cmd ${ns_a} ip addr add ${vti_a_addr}/${vti_mask} dev vti${proto}_a
+ run_cmd ${ns_b} ip addr add ${vti_b_addr}/${vti_mask} dev vti${proto}_b
+
+ run_cmd ${ns_a} ip link set vti${proto}_a up
+ run_cmd ${ns_b} ip link set vti${proto}_b up
+}
+
+setup_vti4() {
+ setup_vti 4 ${veth4_a_addr} ${veth4_b_addr} ${tunnel4_a_addr} ${tunnel4_b_addr} ${tunnel4_mask}
+}
+
+setup_vti6() {
+ setup_vti 6 ${veth6_a_addr} ${veth6_b_addr} ${tunnel6_a_addr} ${tunnel6_b_addr} ${tunnel6_mask}
+}
+
+setup_vxlan_or_geneve() {
+ type="${1}"
+ a_addr="${2}"
+ b_addr="${3}"
+ opts="${4}"
+ br_if_a="${5}"
+
+ if [ "${type}" = "vxlan" ]; then
+ opts="${opts} ttl 64 dstport 4789"
+ opts_a="local ${a_addr}"
+ opts_b="local ${b_addr}"
+ else
+ opts_a=""
+ opts_b=""
+ fi
+
+ run_cmd ${ns_a} ip link add ${type}_a type ${type} id 1 ${opts_a} remote ${b_addr} ${opts} || return 1
+ run_cmd ${ns_b} ip link add ${type}_b type ${type} id 1 ${opts_b} remote ${a_addr} ${opts}
+
+ if [ -n "${br_if_a}" ]; then
+ run_cmd ${ns_a} ip addr add ${tunnel4_a_addr}/${tunnel4_mask} dev ${br_if_a}
+ run_cmd ${ns_a} ip addr add ${tunnel6_a_addr}/${tunnel6_mask} dev ${br_if_a}
+ run_cmd ${ns_a} ip link set ${type}_a master ${br_if_a}
+ else
+ run_cmd ${ns_a} ip addr add ${tunnel4_a_addr}/${tunnel4_mask} dev ${type}_a
+ run_cmd ${ns_a} ip addr add ${tunnel6_a_addr}/${tunnel6_mask} dev ${type}_a
+ fi
+
+ run_cmd ${ns_b} ip addr add ${tunnel4_b_addr}/${tunnel4_mask} dev ${type}_b
+ run_cmd ${ns_b} ip addr add ${tunnel6_b_addr}/${tunnel6_mask} dev ${type}_b
+
+ run_cmd ${ns_a} ip link set ${type}_a up
+ run_cmd ${ns_b} ip link set ${type}_b up
+}
+
+setup_geneve4() {
+ setup_vxlan_or_geneve geneve ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1 "df set"
+}
+
+setup_vxlan4() {
+ setup_vxlan_or_geneve vxlan ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1 "df set"
+}
+
+setup_geneve6() {
+ setup_vxlan_or_geneve geneve ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 ""
+}
+
+setup_vxlan6() {
+ setup_vxlan_or_geneve vxlan ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 ""
+}
+
+setup_bridged_geneve4() {
+ setup_vxlan_or_geneve geneve ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1 "df set" "br0"
+}
+
+setup_bridged_vxlan4() {
+ setup_vxlan_or_geneve vxlan ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1 "df set" "br0"
+}
+
+setup_bridged_geneve6() {
+ setup_vxlan_or_geneve geneve ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 "" "br0"
+}
+
+setup_bridged_vxlan6() {
+ setup_vxlan_or_geneve vxlan ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 "" "br0"
+}
+
+setup_xfrm() {
+ proto=${1}
+ veth_a_addr="${2}"
+ veth_b_addr="${3}"
+
+ 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
+ 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
+ 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
+ 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
+
+ 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
+ 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
+ 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
+ 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
+}
+
+setup_xfrm4() {
+ setup_xfrm 4 ${veth4_a_addr} ${veth4_b_addr}
+}
+
+setup_xfrm6() {
+ setup_xfrm 6 ${veth6_a_addr} ${veth6_b_addr}
+}
+
+setup_routing_old() {
+ for i in ${routes}; do
+ [ "${ns}" = "" ] && ns="${i}" && continue
+ [ "${addr}" = "" ] && addr="${i}" && continue
+ [ "${gw}" = "" ] && gw="${i}"
+
+ ns_name="$(nsname ${ns})"
+
+ ip -n ${ns_name} route add ${addr} via ${gw}
+
+ ns=""; addr=""; gw=""
+ done
+}
+
+setup_routing_new() {
+ for i in ${nexthops}; do
+ [ "${ns}" = "" ] && ns="${i}" && continue
+ [ "${fam}" = "" ] && fam="${i}" && continue
+ [ "${nhid}" = "" ] && nhid="${i}" && continue
+ [ "${gw}" = "" ] && gw="${i}" && continue
+ [ "${dev}" = "" ] && dev="${i}"
+
+ ns_name="$(nsname ${ns})"
+
+ ip -n ${ns_name} -${fam} nexthop add id ${nhid} via ${gw} dev ${dev}
+
+ ns=""; fam=""; nhid=""; gw=""; dev=""
+
+ done
+
+ for i in ${routes_nh}; do
+ [ "${ns}" = "" ] && ns="${i}" && continue
+ [ "${fam}" = "" ] && fam="${i}" && continue
+ [ "${addr}" = "" ] && addr="${i}" && continue
+ [ "${nhid}" = "" ] && nhid="${i}"
+
+ ns_name="$(nsname ${ns})"
+
+ ip -n ${ns_name} -${fam} route add ${addr} nhid ${nhid}
+
+ ns=""; fam=""; addr=""; nhid=""
+ done
+}
+
+setup_routing() {
+ for i in ${NS_R1} ${NS_R2}; do
+ ip netns exec ${i} sysctl -q net/ipv4/ip_forward=1
+ ip netns exec ${i} sysctl -q net/ipv6/conf/all/forwarding=1
+ done
+
+ for i in ${routing_addrs}; do
+ [ "${ns}" = "" ] && ns="${i}" && continue
+ [ "${peer}" = "" ] && peer="${i}" && continue
+ [ "${segment}" = "" ] && segment="${i}"
+
+ ns_name="$(nsname ${ns})"
+ peer_name="$(nsname ${peer})"
+ if="veth_${ns}-${peer}"
+ ifpeer="veth_${peer}-${ns}"
+
+ # Create veth links
+ ip link add ${if} up netns ${ns_name} type veth peer name ${ifpeer} netns ${peer_name} || return 1
+ ip -n ${peer_name} link set dev ${ifpeer} up
+
+ # Add addresses
+ ip -n ${ns_name} addr add ${prefix4}.${segment}.1/24 dev ${if}
+ ip -n ${ns_name} addr add ${prefix6}:${segment}::1/64 dev ${if}
+
+ ip -n ${peer_name} addr add ${prefix4}.${segment}.2/24 dev ${ifpeer}
+ ip -n ${peer_name} addr add ${prefix6}:${segment}::2/64 dev ${ifpeer}
+
+ ns=""; peer=""; segment=""
+ done
+
+ if [ "$USE_NH" = "yes" ]; then
+ setup_routing_new
+ else
+ setup_routing_old
+ fi
+
+ return 0
+}
+
+setup_bridge() {
+ run_cmd ${ns_a} ip link add br0 type bridge || return 2
+ run_cmd ${ns_a} ip link set br0 up
+
+ run_cmd ${ns_c} ip link add veth_C-A type veth peer name veth_A-C
+ run_cmd ${ns_c} ip link set veth_A-C netns ns-A
+
+ run_cmd ${ns_a} ip link set veth_A-C up
+ run_cmd ${ns_c} ip link set veth_C-A up
+ run_cmd ${ns_c} ip addr add ${veth4_c_addr}/${veth4_mask} dev veth_C-A
+ run_cmd ${ns_c} ip addr add ${veth6_c_addr}/${veth6_mask} dev veth_C-A
+ run_cmd ${ns_a} ip link set veth_A-C master br0
+}
+
+setup_ovs_vxlan_or_geneve() {
+ type="${1}"
+ a_addr="${2}"
+ b_addr="${3}"
+
+ if [ "${type}" = "vxlan" ]; then
+ opts="${opts} ttl 64 dstport 4789"
+ opts_b="local ${b_addr}"
+ fi
+
+ run_cmd ovs-vsctl add-port ovs_br0 ${type}_a -- \
+ set interface ${type}_a type=${type} \
+ options:remote_ip=${b_addr} options:key=1 options:csum=true || return 1
+
+ run_cmd ${ns_b} ip link add ${type}_b type ${type} id 1 ${opts_b} remote ${a_addr} ${opts} || return 1
+
+ run_cmd ${ns_b} ip addr add ${tunnel4_b_addr}/${tunnel4_mask} dev ${type}_b
+ run_cmd ${ns_b} ip addr add ${tunnel6_b_addr}/${tunnel6_mask} dev ${type}_b
+
+ run_cmd ${ns_b} ip link set ${type}_b up
+}
+
+setup_ovs_geneve4() {
+ setup_ovs_vxlan_or_geneve geneve ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1
+}
+
+setup_ovs_vxlan4() {
+ setup_ovs_vxlan_or_geneve vxlan ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1
+}
+
+setup_ovs_geneve6() {
+ setup_ovs_vxlan_or_geneve geneve ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1
+}
+
+setup_ovs_vxlan6() {
+ setup_ovs_vxlan_or_geneve vxlan ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1
+}
+
+setup_ovs_bridge() {
+ run_cmd ovs-vsctl add-br ovs_br0 || return 2
+ run_cmd ip link set ovs_br0 up
+
+ run_cmd ${ns_c} ip link add veth_C-A type veth peer name veth_A-C
+ run_cmd ${ns_c} ip link set veth_A-C netns 1
+
+ run_cmd ip link set veth_A-C up
+ run_cmd ${ns_c} ip link set veth_C-A up
+ run_cmd ${ns_c} ip addr add ${veth4_c_addr}/${veth4_mask} dev veth_C-A
+ run_cmd ${ns_c} ip addr add ${veth6_c_addr}/${veth6_mask} dev veth_C-A
+ run_cmd ovs-vsctl add-port ovs_br0 veth_A-C
+
+ # Move veth_A-R1 to init
+ run_cmd ${ns_a} ip link set veth_A-R1 netns 1
+ run_cmd ip addr add ${prefix4}.${a_r1}.1/${veth4_mask} dev veth_A-R1
+ run_cmd ip addr add ${prefix6}:${a_r1}::1/${veth6_mask} dev veth_A-R1
+ run_cmd ip link set veth_A-R1 up
+ run_cmd ip route add ${prefix4}.${b_r1}.1 via ${prefix4}.${a_r1}.2
+ run_cmd ip route add ${prefix6}:${b_r1}::1 via ${prefix6}:${a_r1}::2
+}
+
+setup() {
+ [ "$(id -u)" -ne 0 ] && echo " need to run as root" && return $ksft_skip
+
+ for arg do
+ eval setup_${arg} || { echo " ${arg} not supported"; return 1; }
+ done
+}
+
+trace() {
+ [ $TRACING -eq 0 ] && return
+
+ for arg do
+ [ "${ns_cmd}" = "" ] && ns_cmd="${arg}" && continue
+ ${ns_cmd} tcpdump --immediate-mode -s 0 -i "${arg}" -w "${name}_${arg}.pcap" 2> /dev/null &
+ tcpdump_pids="${tcpdump_pids} $!"
+ ns_cmd=
+ done
+ sleep 1
+}
+
+cleanup() {
+ for pid in ${tcpdump_pids}; do
+ kill ${pid}
+ done
+ tcpdump_pids=
+
+ for n in ${NS_A} ${NS_B} ${NS_C} ${NS_R1} ${NS_R2}; do
+ ip netns del ${n} 2> /dev/null
+ done
+
+ ip link del veth_A-C 2>/dev/null
+ ip link del veth_A-R1 2>/dev/null
+ ovs-vsctl --if-exists del-port vxlan_a 2>/dev/null
+ ovs-vsctl --if-exists del-br ovs_br0 2>/dev/null
+}
+
+mtu() {
+ ns_cmd="${1}"
+ dev="${2}"
+ mtu="${3}"
+
+ ${ns_cmd} ip link set dev ${dev} mtu ${mtu}
+}
+
+mtu_parse() {
+ input="${1}"
+
+ next=0
+ for i in ${input}; do
+ [ ${next} -eq 1 -a "${i}" = "lock" ] && next=2 && continue
+ [ ${next} -eq 1 ] && echo "${i}" && return
+ [ ${next} -eq 2 ] && echo "lock ${i}" && return
+ [ "${i}" = "mtu" ] && next=1
+ done
+}
+
+link_get() {
+ ns_cmd="${1}"
+ name="${2}"
+
+ ${ns_cmd} ip link show dev "${name}"
+}
+
+link_get_mtu() {
+ ns_cmd="${1}"
+ name="${2}"
+
+ mtu_parse "$(link_get "${ns_cmd}" ${name})"
+}
+
+route_get_dst_exception() {
+ ns_cmd="${1}"
+ dst="${2}"
+
+ ${ns_cmd} ip route get "${dst}"
+}
+
+route_get_dst_pmtu_from_exception() {
+ ns_cmd="${1}"
+ dst="${2}"
+
+ mtu_parse "$(route_get_dst_exception "${ns_cmd}" ${dst})"
+}
+
+check_pmtu_value() {
+ expected="${1}"
+ value="${2}"
+ event="${3}"
+
+ [ "${expected}" = "any" ] && [ -n "${value}" ] && return 0
+ [ "${value}" = "${expected}" ] && return 0
+ [ -z "${value}" ] && err " PMTU exception wasn't created after ${event}" && return 1
+ [ -z "${expected}" ] && err " PMTU exception shouldn't exist after ${event}" && return 1
+ err " found PMTU exception with incorrect MTU ${value}, expected ${expected}, after ${event}"
+ return 1
+}
+
+test_pmtu_ipvX() {
+ family=${1}
+
+ setup namespaces routing || return 2
+ trace "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \
+ "${ns_r1}" veth_R1-B "${ns_b}" veth_B-R1 \
+ "${ns_a}" veth_A-R2 "${ns_r2}" veth_R2-A \
+ "${ns_r2}" veth_R2-B "${ns_b}" veth_B-R2
+
+ if [ ${family} -eq 4 ]; then
+ ping=ping
+ dst1="${prefix4}.${b_r1}.1"
+ dst2="${prefix4}.${b_r2}.1"
+ else
+ ping=${ping6}
+ dst1="${prefix6}:${b_r1}::1"
+ dst2="${prefix6}:${b_r2}::1"
+ fi
+
+ # Set up initial MTU values
+ mtu "${ns_a}" veth_A-R1 2000
+ mtu "${ns_r1}" veth_R1-A 2000
+ mtu "${ns_r1}" veth_R1-B 1400
+ mtu "${ns_b}" veth_B-R1 1400
+
+ mtu "${ns_a}" veth_A-R2 2000
+ mtu "${ns_r2}" veth_R2-A 2000
+ mtu "${ns_r2}" veth_R2-B 1500
+ mtu "${ns_b}" veth_B-R2 1500
+
+ # Create route exceptions
+ run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1800 ${dst1}
+ run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1800 ${dst2}
+
+ # Check that exceptions have been created with the correct PMTU
+ pmtu_1="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst1})"
+ check_pmtu_value "1400" "${pmtu_1}" "exceeding MTU" || return 1
+ pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})"
+ check_pmtu_value "1500" "${pmtu_2}" "exceeding MTU" || return 1
+
+ # Decrease local MTU below PMTU, check for PMTU decrease in route exception
+ mtu "${ns_a}" veth_A-R1 1300
+ mtu "${ns_r1}" veth_R1-A 1300
+ pmtu_1="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst1})"
+ check_pmtu_value "1300" "${pmtu_1}" "decreasing local MTU" || return 1
+ # Second exception shouldn't be modified
+ pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})"
+ check_pmtu_value "1500" "${pmtu_2}" "changing local MTU on a link not on this path" || return 1
+
+ # Increase MTU, check for PMTU increase in route exception
+ mtu "${ns_a}" veth_A-R1 1700
+ mtu "${ns_r1}" veth_R1-A 1700
+ pmtu_1="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst1})"
+ check_pmtu_value "1700" "${pmtu_1}" "increasing local MTU" || return 1
+ # Second exception shouldn't be modified
+ pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})"
+ check_pmtu_value "1500" "${pmtu_2}" "changing local MTU on a link not on this path" || return 1
+
+ # Skip PMTU locking tests for IPv6
+ [ $family -eq 6 ] && return 0
+
+ # Decrease remote MTU on path via R2, get new exception
+ mtu "${ns_r2}" veth_R2-B 400
+ mtu "${ns_b}" veth_B-R2 400
+ run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1400 ${dst2}
+ pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})"
+ check_pmtu_value "lock 552" "${pmtu_2}" "exceeding MTU, with MTU < min_pmtu" || return 1
+
+ # Decrease local MTU below PMTU
+ mtu "${ns_a}" veth_A-R2 500
+ mtu "${ns_r2}" veth_R2-A 500
+ pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})"
+ check_pmtu_value "500" "${pmtu_2}" "decreasing local MTU" || return 1
+
+ # Increase local MTU
+ mtu "${ns_a}" veth_A-R2 1500
+ mtu "${ns_r2}" veth_R2-A 1500
+ pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})"
+ check_pmtu_value "1500" "${pmtu_2}" "increasing local MTU" || return 1
+
+ # Get new exception
+ run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1400 ${dst2}
+ pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})"
+ check_pmtu_value "lock 552" "${pmtu_2}" "exceeding MTU, with MTU < min_pmtu" || return 1
+}
+
+test_pmtu_ipv4_exception() {
+ test_pmtu_ipvX 4
+}
+
+test_pmtu_ipv6_exception() {
+ test_pmtu_ipvX 6
+}
+
+test_pmtu_ipvX_over_vxlanY_or_geneveY_exception() {
+ type=${1}
+ family=${2}
+ outer_family=${3}
+ ll_mtu=4000
+
+ if [ ${outer_family} -eq 4 ]; then
+ setup namespaces routing ${type}4 || return 2
+ # IPv4 header UDP header VXLAN/GENEVE header Ethernet header
+ exp_mtu=$((${ll_mtu} - 20 - 8 - 8 - 14))
+ else
+ setup namespaces routing ${type}6 || return 2
+ # IPv6 header UDP header VXLAN/GENEVE header Ethernet header
+ exp_mtu=$((${ll_mtu} - 40 - 8 - 8 - 14))
+ fi
+
+ trace "${ns_a}" ${type}_a "${ns_b}" ${type}_b \
+ "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \
+ "${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B
+
+ if [ ${family} -eq 4 ]; then
+ ping=ping
+ dst=${tunnel4_b_addr}
+ else
+ ping=${ping6}
+ dst=${tunnel6_b_addr}
+ fi
+
+ # Create route exception by exceeding link layer MTU
+ mtu "${ns_a}" veth_A-R1 $((${ll_mtu} + 1000))
+ mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000))
+ mtu "${ns_b}" veth_B-R1 ${ll_mtu}
+ mtu "${ns_r1}" veth_R1-B ${ll_mtu}
+
+ mtu "${ns_a}" ${type}_a $((${ll_mtu} + 1000))
+ mtu "${ns_b}" ${type}_b $((${ll_mtu} + 1000))
+ run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${dst}
+
+ # Check that exception was created
+ pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst})"
+ check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on ${type} interface"
+}
+
+test_pmtu_ipv4_vxlan4_exception() {
+ test_pmtu_ipvX_over_vxlanY_or_geneveY_exception vxlan 4 4
+}
+
+test_pmtu_ipv6_vxlan4_exception() {
+ test_pmtu_ipvX_over_vxlanY_or_geneveY_exception vxlan 6 4
+}
+
+test_pmtu_ipv4_geneve4_exception() {
+ test_pmtu_ipvX_over_vxlanY_or_geneveY_exception geneve 4 4
+}
+
+test_pmtu_ipv6_geneve4_exception() {
+ test_pmtu_ipvX_over_vxlanY_or_geneveY_exception geneve 6 4
+}
+
+test_pmtu_ipv4_vxlan6_exception() {
+ test_pmtu_ipvX_over_vxlanY_or_geneveY_exception vxlan 4 6
+}
+
+test_pmtu_ipv6_vxlan6_exception() {
+ test_pmtu_ipvX_over_vxlanY_or_geneveY_exception vxlan 6 6
+}
+
+test_pmtu_ipv4_geneve6_exception() {
+ test_pmtu_ipvX_over_vxlanY_or_geneveY_exception geneve 4 6
+}
+
+test_pmtu_ipv6_geneve6_exception() {
+ test_pmtu_ipvX_over_vxlanY_or_geneveY_exception geneve 6 6
+}
+
+test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception() {
+ type=${1}
+ family=${2}
+ outer_family=${3}
+ ll_mtu=4000
+
+ if [ ${outer_family} -eq 4 ]; then
+ setup namespaces routing bridge bridged_${type}4 || return 2
+ # IPv4 header UDP header VXLAN/GENEVE header Ethernet header
+ exp_mtu=$((${ll_mtu} - 20 - 8 - 8 - 14))
+ else
+ setup namespaces routing bridge bridged_${type}6 || return 2
+ # IPv6 header UDP header VXLAN/GENEVE header Ethernet header
+ exp_mtu=$((${ll_mtu} - 40 - 8 - 8 - 14))
+ fi
+
+ trace "${ns_a}" ${type}_a "${ns_b}" ${type}_b \
+ "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \
+ "${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B \
+ "${ns_a}" br0 "${ns_a}" veth-A-C \
+ "${ns_c}" veth_C-A
+
+ if [ ${family} -eq 4 ]; then
+ ping=ping
+ dst=${tunnel4_b_addr}
+ else
+ ping=${ping6}
+ dst=${tunnel6_b_addr}
+ fi
+
+ # Create route exception by exceeding link layer MTU
+ mtu "${ns_a}" veth_A-R1 $((${ll_mtu} + 1000))
+ mtu "${ns_a}" br0 $((${ll_mtu} + 1000))
+ mtu "${ns_a}" veth_A-C $((${ll_mtu} + 1000))
+ mtu "${ns_c}" veth_C-A $((${ll_mtu} + 1000))
+ mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000))
+ mtu "${ns_b}" veth_B-R1 ${ll_mtu}
+ mtu "${ns_r1}" veth_R1-B ${ll_mtu}
+
+ mtu "${ns_a}" ${type}_a $((${ll_mtu} + 1000))
+ mtu "${ns_b}" ${type}_b $((${ll_mtu} + 1000))
+
+ run_cmd ${ns_c} ${ping} -q -M want -i 0.1 -c 10 -s $((${ll_mtu} + 500)) ${dst} || return 1
+ run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${dst} || return 1
+
+ # Check that exceptions were created
+ pmtu="$(route_get_dst_pmtu_from_exception "${ns_c}" ${dst})"
+ check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on bridged ${type} interface"
+ pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst})"
+ check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on locally bridged ${type} interface"
+}
+
+test_pmtu_ipv4_br_vxlan4_exception() {
+ test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception vxlan 4 4
+}
+
+test_pmtu_ipv6_br_vxlan4_exception() {
+ test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception vxlan 6 4
+}
+
+test_pmtu_ipv4_br_geneve4_exception() {
+ test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception geneve 4 4
+}
+
+test_pmtu_ipv6_br_geneve4_exception() {
+ test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception geneve 6 4
+}
+
+test_pmtu_ipv4_br_vxlan6_exception() {
+ test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception vxlan 4 6
+}
+
+test_pmtu_ipv6_br_vxlan6_exception() {
+ test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception vxlan 6 6
+}
+
+test_pmtu_ipv4_br_geneve6_exception() {
+ test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception geneve 4 6
+}
+
+test_pmtu_ipv6_br_geneve6_exception() {
+ test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception geneve 6 6
+}
+
+test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception() {
+ type=${1}
+ family=${2}
+ outer_family=${3}
+ ll_mtu=4000
+
+ if [ ${outer_family} -eq 4 ]; then
+ setup namespaces routing ovs_bridge ovs_${type}4 || return 2
+ # IPv4 header UDP header VXLAN/GENEVE header Ethernet header
+ exp_mtu=$((${ll_mtu} - 20 - 8 - 8 - 14))
+ else
+ setup namespaces routing ovs_bridge ovs_${type}6 || return 2
+ # IPv6 header UDP header VXLAN/GENEVE header Ethernet header
+ exp_mtu=$((${ll_mtu} - 40 - 8 - 8 - 14))
+ fi
+
+ if [ "${type}" = "vxlan" ]; then
+ tun_a="vxlan_sys_4789"
+ elif [ "${type}" = "geneve" ]; then
+ tun_a="genev_sys_6081"
+ fi
+
+ trace "" "${tun_a}" "${ns_b}" ${type}_b \
+ "" veth_A-R1 "${ns_r1}" veth_R1-A \
+ "${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B \
+ "" ovs_br0 "" veth-A-C \
+ "${ns_c}" veth_C-A
+
+ if [ ${family} -eq 4 ]; then
+ ping=ping
+ dst=${tunnel4_b_addr}
+ else
+ ping=${ping6}
+ dst=${tunnel6_b_addr}
+ fi
+
+ # Create route exception by exceeding link layer MTU
+ mtu "" veth_A-R1 $((${ll_mtu} + 1000))
+ mtu "" ovs_br0 $((${ll_mtu} + 1000))
+ mtu "" veth_A-C $((${ll_mtu} + 1000))
+ mtu "${ns_c}" veth_C-A $((${ll_mtu} + 1000))
+ mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000))
+ mtu "${ns_b}" veth_B-R1 ${ll_mtu}
+ mtu "${ns_r1}" veth_R1-B ${ll_mtu}
+
+ mtu "" ${tun_a} $((${ll_mtu} + 1000))
+ mtu "${ns_b}" ${type}_b $((${ll_mtu} + 1000))
+
+ run_cmd ${ns_c} ${ping} -q -M want -i 0.1 -c 20 -s $((${ll_mtu} + 500)) ${dst} || return 1
+
+ # Check that exceptions were created
+ pmtu="$(route_get_dst_pmtu_from_exception "${ns_c}" ${dst})"
+ check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on Open vSwitch ${type} interface"
+}
+
+test_pmtu_ipv4_ovs_vxlan4_exception() {
+ test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception vxlan 4 4
+}
+
+test_pmtu_ipv6_ovs_vxlan4_exception() {
+ test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception vxlan 6 4
+}
+
+test_pmtu_ipv4_ovs_geneve4_exception() {
+ test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception geneve 4 4
+}
+
+test_pmtu_ipv6_ovs_geneve4_exception() {
+ test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception geneve 6 4
+}
+
+test_pmtu_ipv4_ovs_vxlan6_exception() {
+ test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception vxlan 4 6
+}
+
+test_pmtu_ipv6_ovs_vxlan6_exception() {
+ test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception vxlan 6 6
+}
+
+test_pmtu_ipv4_ovs_geneve6_exception() {
+ test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception geneve 4 6
+}
+
+test_pmtu_ipv6_ovs_geneve6_exception() {
+ test_pmtu_ipvX_over_ovs_vxlanY_or_geneveY_exception geneve 6 6
+}
+
+test_pmtu_ipvX_over_fouY_or_gueY() {
+ inner_family=${1}
+ outer_family=${2}
+ encap=${3}
+ ll_mtu=4000
+
+ setup namespaces routing ${encap}${outer_family}${inner_family} || return 2
+ trace "${ns_a}" ${encap}_a "${ns_b}" ${encap}_b \
+ "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \
+ "${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B
+
+ if [ ${inner_family} -eq 4 ]; then
+ ping=ping
+ dst=${tunnel4_b_addr}
+ else
+ ping=${ping6}
+ dst=${tunnel6_b_addr}
+ fi
+
+ if [ "${encap}" = "gue" ]; then
+ encap_overhead=4
+ else
+ encap_overhead=0
+ fi
+
+ if [ ${outer_family} -eq 4 ]; then
+ # IPv4 header UDP header
+ exp_mtu=$((${ll_mtu} - 20 - 8 - ${encap_overhead}))
+ else
+ # IPv6 header Option 4 UDP header
+ exp_mtu=$((${ll_mtu} - 40 - 8 - 8 - ${encap_overhead}))
+ fi
+
+ # Create route exception by exceeding link layer MTU
+ mtu "${ns_a}" veth_A-R1 $((${ll_mtu} + 1000))
+ mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000))
+ mtu "${ns_b}" veth_B-R1 ${ll_mtu}
+ mtu "${ns_r1}" veth_R1-B ${ll_mtu}
+
+ mtu "${ns_a}" ${encap}_a $((${ll_mtu} + 1000))
+ mtu "${ns_b}" ${encap}_b $((${ll_mtu} + 1000))
+ run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${dst}
+
+ # Check that exception was created
+ pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst})"
+ check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on ${encap} interface"
+}
+
+test_pmtu_ipv4_fou4_exception() {
+ test_pmtu_ipvX_over_fouY_or_gueY 4 4 fou
+}
+
+test_pmtu_ipv6_fou4_exception() {
+ test_pmtu_ipvX_over_fouY_or_gueY 6 4 fou
+}
+
+test_pmtu_ipv4_fou6_exception() {
+ test_pmtu_ipvX_over_fouY_or_gueY 4 6 fou
+}
+
+test_pmtu_ipv6_fou6_exception() {
+ test_pmtu_ipvX_over_fouY_or_gueY 6 6 fou
+}
+
+test_pmtu_ipv4_gue4_exception() {
+ test_pmtu_ipvX_over_fouY_or_gueY 4 4 gue
+}
+
+test_pmtu_ipv6_gue4_exception() {
+ test_pmtu_ipvX_over_fouY_or_gueY 6 4 gue
+}
+
+test_pmtu_ipv4_gue6_exception() {
+ test_pmtu_ipvX_over_fouY_or_gueY 4 6 gue
+}
+
+test_pmtu_ipv6_gue6_exception() {
+ test_pmtu_ipvX_over_fouY_or_gueY 6 6 gue
+}
+
+test_pmtu_ipvX_over_ipvY_exception() {
+ inner=${1}
+ outer=${2}
+ ll_mtu=4000
+
+ setup namespaces routing ip${inner}ip${outer} || return 2
+
+ trace "${ns_a}" ip_a "${ns_b}" ip_b \
+ "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \
+ "${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B
+
+ if [ ${inner} -eq 4 ]; then
+ ping=ping
+ dst=${tunnel4_b_addr}
+ else
+ ping=${ping6}
+ dst=${tunnel6_b_addr}
+ fi
+
+ if [ ${outer} -eq 4 ]; then
+ # IPv4 header
+ exp_mtu=$((${ll_mtu} - 20))
+ else
+ # IPv6 header Option 4
+ exp_mtu=$((${ll_mtu} - 40 - 8))
+ fi
+
+ # Create route exception by exceeding link layer MTU
+ mtu "${ns_a}" veth_A-R1 $((${ll_mtu} + 1000))
+ mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000))
+ mtu "${ns_b}" veth_B-R1 ${ll_mtu}
+ mtu "${ns_r1}" veth_R1-B ${ll_mtu}
+
+ mtu "${ns_a}" ip_a $((${ll_mtu} + 1000)) || return
+ mtu "${ns_b}" ip_b $((${ll_mtu} + 1000)) || return
+ run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${dst}
+
+ # Check that exception was created
+ pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst})"
+ check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on ip${inner}ip${outer} interface"
+}
+
+test_pmtu_ipv4_ipv4_exception() {
+ test_pmtu_ipvX_over_ipvY_exception 4 4
+}
+
+test_pmtu_ipv6_ipv4_exception() {
+ test_pmtu_ipvX_over_ipvY_exception 6 4
+}
+
+test_pmtu_ipv4_ipv6_exception() {
+ test_pmtu_ipvX_over_ipvY_exception 4 6
+}
+
+test_pmtu_ipv6_ipv6_exception() {
+ test_pmtu_ipvX_over_ipvY_exception 6 6
+}
+
+test_pmtu_vti4_exception() {
+ setup namespaces veth vti4 xfrm4 || return 2
+ trace "${ns_a}" veth_a "${ns_b}" veth_b \
+ "${ns_a}" vti4_a "${ns_b}" vti4_b
+
+ veth_mtu=1500
+ vti_mtu=$((veth_mtu - 20))
+
+ # SPI SN IV ICV pad length next header
+ esp_payload_rfc4106=$((vti_mtu - 4 - 4 - 8 - 16 - 1 - 1))
+ ping_payload=$((esp_payload_rfc4106 - 28))
+
+ mtu "${ns_a}" veth_a ${veth_mtu}
+ mtu "${ns_b}" veth_b ${veth_mtu}
+ mtu "${ns_a}" vti4_a ${vti_mtu}
+ mtu "${ns_b}" vti4_b ${vti_mtu}
+
+ # Send DF packet without exceeding link layer MTU, check that no
+ # exception is created
+ run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s ${ping_payload} ${tunnel4_b_addr}
+ pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel4_b_addr})"
+ check_pmtu_value "" "${pmtu}" "sending packet smaller than PMTU (IP payload length ${esp_payload_rfc4106})" || return 1
+
+ # Now exceed link layer MTU by one byte, check that exception is created
+ # with the right PMTU value
+ run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s $((ping_payload + 1)) ${tunnel4_b_addr}
+ pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel4_b_addr})"
+ check_pmtu_value "${esp_payload_rfc4106}" "${pmtu}" "exceeding PMTU (IP payload length $((esp_payload_rfc4106 + 1)))"
+}
+
+test_pmtu_vti6_exception() {
+ setup namespaces veth vti6 xfrm6 || return 2
+ trace "${ns_a}" veth_a "${ns_b}" veth_b \
+ "${ns_a}" vti6_a "${ns_b}" vti6_b
+ fail=0
+
+ # Create route exception by exceeding link layer MTU
+ mtu "${ns_a}" veth_a 4000
+ mtu "${ns_b}" veth_b 4000
+ mtu "${ns_a}" vti6_a 5000
+ mtu "${ns_b}" vti6_b 5000
+ run_cmd ${ns_a} ${ping6} -q -i 0.1 -w 1 -s 60000 ${tunnel6_b_addr}
+
+ # Check that exception was created
+ pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})"
+ check_pmtu_value any "${pmtu}" "creating tunnel exceeding link layer MTU" || return 1
+
+ # Decrease tunnel MTU, check for PMTU decrease in route exception
+ mtu "${ns_a}" vti6_a 3000
+ pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})"
+ check_pmtu_value "3000" "${pmtu}" "decreasing tunnel MTU" || fail=1
+
+ # Increase tunnel MTU, check for PMTU increase in route exception
+ mtu "${ns_a}" vti6_a 9000
+ pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})"
+ check_pmtu_value "9000" "${pmtu}" "increasing tunnel MTU" || fail=1
+
+ return ${fail}
+}
+
+test_pmtu_vti4_default_mtu() {
+ setup namespaces veth vti4 || return 2
+
+ # Check that MTU of vti device is MTU of veth minus IPv4 header length
+ veth_mtu="$(link_get_mtu "${ns_a}" veth_a)"
+ vti4_mtu="$(link_get_mtu "${ns_a}" vti4_a)"
+ if [ $((veth_mtu - vti4_mtu)) -ne 20 ]; then
+ err " vti MTU ${vti4_mtu} is not veth MTU ${veth_mtu} minus IPv4 header length"
+ return 1
+ fi
+}
+
+test_pmtu_vti6_default_mtu() {
+ setup namespaces veth vti6 || return 2
+
+ # Check that MTU of vti device is MTU of veth minus IPv6 header length
+ veth_mtu="$(link_get_mtu "${ns_a}" veth_a)"
+ vti6_mtu="$(link_get_mtu "${ns_a}" vti6_a)"
+ if [ $((veth_mtu - vti6_mtu)) -ne 40 ]; then
+ err " vti MTU ${vti6_mtu} is not veth MTU ${veth_mtu} minus IPv6 header length"
+ return 1
+ fi
+}
+
+test_pmtu_vti4_link_add_mtu() {
+ setup namespaces || return 2
+
+ run_cmd ${ns_a} ip link add vti4_a type vti local ${veth4_a_addr} remote ${veth4_b_addr} key 10
+ [ $? -ne 0 ] && err " vti not supported" && return 2
+ run_cmd ${ns_a} ip link del vti4_a
+
+ fail=0
+
+ min=68
+ max=$((65535 - 20))
+ # Check invalid values first
+ for v in $((min - 1)) $((max + 1)); do
+ run_cmd ${ns_a} ip link add vti4_a mtu ${v} type vti local ${veth4_a_addr} remote ${veth4_b_addr} key 10
+ # This can fail, or MTU can be adjusted to a proper value
+ [ $? -ne 0 ] && continue
+ mtu="$(link_get_mtu "${ns_a}" vti4_a)"
+ if [ ${mtu} -lt ${min} -o ${mtu} -gt ${max} ]; then
+ err " vti tunnel created with invalid MTU ${mtu}"
+ fail=1
+ fi
+ run_cmd ${ns_a} ip link del vti4_a
+ done
+
+ # Now check valid values
+ for v in ${min} 1300 ${max}; do
+ run_cmd ${ns_a} ip link add vti4_a mtu ${v} type vti local ${veth4_a_addr} remote ${veth4_b_addr} key 10
+ mtu="$(link_get_mtu "${ns_a}" vti4_a)"
+ run_cmd ${ns_a} ip link del vti4_a
+ if [ "${mtu}" != "${v}" ]; then
+ err " vti MTU ${mtu} doesn't match configured value ${v}"
+ fail=1
+ fi
+ done
+
+ return ${fail}
+}
+
+test_pmtu_vti6_link_add_mtu() {
+ setup namespaces || return 2
+
+ run_cmd ${ns_a} ip link add vti6_a type vti6 local ${veth6_a_addr} remote ${veth6_b_addr} key 10
+ [ $? -ne 0 ] && err " vti6 not supported" && return 2
+ run_cmd ${ns_a} ip link del vti6_a
+
+ fail=0
+
+ min=68 # vti6 can carry IPv4 packets too
+ max=$((65535 - 40))
+ # Check invalid values first
+ for v in $((min - 1)) $((max + 1)); do
+ run_cmd ${ns_a} ip link add vti6_a mtu ${v} type vti6 local ${veth6_a_addr} remote ${veth6_b_addr} key 10
+ # This can fail, or MTU can be adjusted to a proper value
+ [ $? -ne 0 ] && continue
+ mtu="$(link_get_mtu "${ns_a}" vti6_a)"
+ if [ ${mtu} -lt ${min} -o ${mtu} -gt ${max} ]; then
+ err " vti6 tunnel created with invalid MTU ${v}"
+ fail=1
+ fi
+ run_cmd ${ns_a} ip link del vti6_a
+ done
+
+ # Now check valid values
+ for v in 68 1280 1300 $((65535 - 40)); do
+ run_cmd ${ns_a} ip link add vti6_a mtu ${v} type vti6 local ${veth6_a_addr} remote ${veth6_b_addr} key 10
+ mtu="$(link_get_mtu "${ns_a}" vti6_a)"
+ run_cmd ${ns_a} ip link del vti6_a
+ if [ "${mtu}" != "${v}" ]; then
+ err " vti6 MTU ${mtu} doesn't match configured value ${v}"
+ fail=1
+ fi
+ done
+
+ return ${fail}
+}
+
+test_pmtu_vti6_link_change_mtu() {
+ setup namespaces || return 2
+
+ run_cmd ${ns_a} ip link add dummy0 mtu 1500 type dummy
+ [ $? -ne 0 ] && err " dummy not supported" && return 2
+ run_cmd ${ns_a} ip link add dummy1 mtu 3000 type dummy
+ run_cmd ${ns_a} ip link set dummy0 up
+ run_cmd ${ns_a} ip link set dummy1 up
+
+ run_cmd ${ns_a} ip addr add ${dummy6_0_prefix}1/${dummy6_mask} dev dummy0
+ run_cmd ${ns_a} ip addr add ${dummy6_1_prefix}1/${dummy6_mask} dev dummy1
+
+ fail=0
+
+ # Create vti6 interface bound to device, passing MTU, check it
+ run_cmd ${ns_a} ip link add vti6_a mtu 1300 type vti6 remote ${dummy6_0_prefix}2 local ${dummy6_0_prefix}1
+ mtu="$(link_get_mtu "${ns_a}" vti6_a)"
+ if [ ${mtu} -ne 1300 ]; then
+ err " vti6 MTU ${mtu} doesn't match configured value 1300"
+ fail=1
+ fi
+
+ # Move to another device with different MTU, without passing MTU, check
+ # MTU is adjusted
+ run_cmd ${ns_a} ip link set vti6_a type vti6 remote ${dummy6_1_prefix}2 local ${dummy6_1_prefix}1
+ mtu="$(link_get_mtu "${ns_a}" vti6_a)"
+ if [ ${mtu} -ne $((3000 - 40)) ]; then
+ err " vti MTU ${mtu} is not dummy MTU 3000 minus IPv6 header length"
+ fail=1
+ fi
+
+ # Move it back, passing MTU, check MTU is not overridden
+ run_cmd ${ns_a} ip link set vti6_a mtu 1280 type vti6 remote ${dummy6_0_prefix}2 local ${dummy6_0_prefix}1
+ mtu="$(link_get_mtu "${ns_a}" vti6_a)"
+ if [ ${mtu} -ne 1280 ]; then
+ err " vti6 MTU ${mtu} doesn't match configured value 1280"
+ fail=1
+ fi
+
+ return ${fail}
+}
+
+check_command() {
+ cmd=${1}
+
+ if ! which ${cmd} > /dev/null 2>&1; then
+ err " missing required command: '${cmd}'"
+ return 1
+ fi
+ return 0
+}
+
+test_cleanup_vxlanX_exception() {
+ outer="${1}"
+ encap="vxlan"
+ ll_mtu=4000
+
+ check_command taskset || return 2
+ cpu_list=$(grep -m 2 processor /proc/cpuinfo | cut -d ' ' -f 2)
+
+ setup namespaces routing ${encap}${outer} || return 2
+ trace "${ns_a}" ${encap}_a "${ns_b}" ${encap}_b \
+ "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \
+ "${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B
+
+ # Create route exception by exceeding link layer MTU
+ mtu "${ns_a}" veth_A-R1 $((${ll_mtu} + 1000))
+ mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000))
+ mtu "${ns_b}" veth_B-R1 ${ll_mtu}
+ mtu "${ns_r1}" veth_R1-B ${ll_mtu}
+
+ mtu "${ns_a}" ${encap}_a $((${ll_mtu} + 1000))
+ mtu "${ns_b}" ${encap}_b $((${ll_mtu} + 1000))
+
+ # Fill exception cache for multiple CPUs (2)
+ # we can always use inner IPv4 for that
+ for cpu in ${cpu_list}; do
+ run_cmd taskset --cpu-list ${cpu} ${ns_a} ping -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${tunnel4_b_addr}
+ done
+
+ ${ns_a} ip link del dev veth_A-R1 &
+ iplink_pid=$!
+ sleep 1
+ if [ "$(cat /proc/${iplink_pid}/cmdline 2>/dev/null | tr -d '\0')" = "iplinkdeldevveth_A-R1" ]; then
+ err " can't delete veth device in a timely manner, PMTU dst likely leaked"
+ return 1
+ fi
+}
+
+test_cleanup_ipv6_exception() {
+ test_cleanup_vxlanX_exception 6
+}
+
+test_cleanup_ipv4_exception() {
+ test_cleanup_vxlanX_exception 4
+}
+
+run_test() {
+ (
+ tname="$1"
+ tdesc="$2"
+
+ unset IFS
+
+ # Since cleanup() relies on variables modified by this subshell, it
+ # has to run in this context.
+ trap cleanup EXIT
+
+ if [ "$VERBOSE" = "1" ]; then
+ printf "\n##########################################################################\n\n"
+ fi
+
+ eval test_${tname}
+ ret=$?
+
+ if [ $ret -eq 0 ]; then
+ printf "TEST: %-60s [ OK ]\n" "${tdesc}"
+ elif [ $ret -eq 1 ]; then
+ printf "TEST: %-60s [FAIL]\n" "${tdesc}"
+ if [ "${PAUSE_ON_FAIL}" = "yes" ]; then
+ echo
+ echo "Pausing. Hit enter to continue"
+ read a
+ fi
+ err_flush
+ exit 1
+ elif [ $ret -eq 2 ]; then
+ printf "TEST: %-60s [SKIP]\n" "${tdesc}"
+ err_flush
+ fi
+
+ return $ret
+ )
+ ret=$?
+ [ $ret -ne 0 ] && exitcode=1
+
+ return $ret
+}
+
+run_test_nh() {
+ tname="$1"
+ tdesc="$2"
+
+ USE_NH=yes
+ run_test "${tname}" "${tdesc} - nexthop objects"
+ USE_NH=no
+}
+
+test_list_flush_ipv4_exception() {
+ setup namespaces routing || return 2
+ trace "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \
+ "${ns_r1}" veth_R1-B "${ns_b}" veth_B-R1 \
+ "${ns_a}" veth_A-R2 "${ns_r2}" veth_R2-A \
+ "${ns_r2}" veth_R2-B "${ns_b}" veth_B-R2
+
+ dst_prefix1="${prefix4}.${b_r1}."
+ dst2="${prefix4}.${b_r2}.1"
+
+ # Set up initial MTU values
+ mtu "${ns_a}" veth_A-R1 2000
+ mtu "${ns_r1}" veth_R1-A 2000
+ mtu "${ns_r1}" veth_R1-B 1500
+ mtu "${ns_b}" veth_B-R1 1500
+
+ mtu "${ns_a}" veth_A-R2 2000
+ mtu "${ns_r2}" veth_R2-A 2000
+ mtu "${ns_r2}" veth_R2-B 1500
+ mtu "${ns_b}" veth_B-R2 1500
+
+ fail=0
+
+ # Add 100 addresses for veth endpoint on B reached by default A route
+ for i in $(seq 100 199); do
+ run_cmd ${ns_b} ip addr add "${dst_prefix1}${i}" dev veth_B-R1
+ done
+
+ # Create 100 cached route exceptions for path via R1, one via R2. Note
+ # that with IPv4 we need to actually cause a route lookup that matches
+ # the exception caused by ICMP, in order to actually have a cached
+ # route, so we need to ping each destination twice
+ for i in $(seq 100 199); do
+ run_cmd ${ns_a} ping -q -M want -i 0.1 -c 2 -s 1800 "${dst_prefix1}${i}"
+ done
+ run_cmd ${ns_a} ping -q -M want -i 0.1 -c 2 -s 1800 "${dst2}"
+
+ if [ "$(${ns_a} ip -oneline route list cache | wc -l)" -ne 101 ]; then
+ err " can't list cached exceptions"
+ fail=1
+ fi
+
+ run_cmd ${ns_a} ip route flush cache
+ pmtu1="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst_prefix}1)"
+ pmtu2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst_prefix}2)"
+ if [ -n "${pmtu1}" ] || [ -n "${pmtu2}" ] || \
+ [ -n "$(${ns_a} ip route list cache)" ]; then
+ err " can't flush cached exceptions"
+ fail=1
+ fi
+
+ return ${fail}
+}
+
+test_list_flush_ipv6_exception() {
+ setup namespaces routing || return 2
+ trace "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \
+ "${ns_r1}" veth_R1-B "${ns_b}" veth_B-R1 \
+ "${ns_a}" veth_A-R2 "${ns_r2}" veth_R2-A \
+ "${ns_r2}" veth_R2-B "${ns_b}" veth_B-R2
+
+ dst_prefix1="${prefix6}:${b_r1}::"
+ dst2="${prefix6}:${b_r2}::1"
+
+ # Set up initial MTU values
+ mtu "${ns_a}" veth_A-R1 2000
+ mtu "${ns_r1}" veth_R1-A 2000
+ mtu "${ns_r1}" veth_R1-B 1500
+ mtu "${ns_b}" veth_B-R1 1500
+
+ mtu "${ns_a}" veth_A-R2 2000
+ mtu "${ns_r2}" veth_R2-A 2000
+ mtu "${ns_r2}" veth_R2-B 1500
+ mtu "${ns_b}" veth_B-R2 1500
+
+ fail=0
+
+ # Add 100 addresses for veth endpoint on B reached by default A route
+ for i in $(seq 100 199); do
+ run_cmd ${ns_b} ip addr add "${dst_prefix1}${i}" dev veth_B-R1
+ done
+
+ # Create 100 cached route exceptions for path via R1, one via R2
+ for i in $(seq 100 199); do
+ run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s 1800 "${dst_prefix1}${i}"
+ done
+ run_cmd ${ns_a} ping -q -M want -i 0.1 -w 1 -s 1800 "${dst2}"
+ if [ "$(${ns_a} ip -oneline -6 route list cache | wc -l)" -ne 101 ]; then
+ err " can't list cached exceptions"
+ fail=1
+ fi
+
+ run_cmd ${ns_a} ip -6 route flush cache
+ pmtu1="$(route_get_dst_pmtu_from_exception "${ns_a}" "${dst_prefix1}100")"
+ pmtu2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})"
+ if [ -n "${pmtu1}" ] || [ -n "${pmtu2}" ] || \
+ [ -n "$(${ns_a} ip -6 route list cache)" ]; then
+ err " can't flush cached exceptions"
+ fail=1
+ fi
+
+ return ${fail}
+}
+
+test_pmtu_ipvX_route_change() {
+ family=${1}
+
+ setup namespaces routing || return 2
+ trace "${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \
+ "${ns_r1}" veth_R1-B "${ns_b}" veth_B-R1 \
+ "${ns_a}" veth_A-R2 "${ns_r2}" veth_R2-A \
+ "${ns_r2}" veth_R2-B "${ns_b}" veth_B-R2
+
+ if [ ${family} -eq 4 ]; then
+ ping=ping
+ dst1="${prefix4}.${b_r1}.1"
+ dst2="${prefix4}.${b_r2}.1"
+ gw="${prefix4}.${a_r1}.2"
+ else
+ ping=${ping6}
+ dst1="${prefix6}:${b_r1}::1"
+ dst2="${prefix6}:${b_r2}::1"
+ gw="${prefix6}:${a_r1}::2"
+ fi
+
+ # Set up initial MTU values
+ mtu "${ns_a}" veth_A-R1 2000
+ mtu "${ns_r1}" veth_R1-A 2000
+ mtu "${ns_r1}" veth_R1-B 1400
+ mtu "${ns_b}" veth_B-R1 1400
+
+ mtu "${ns_a}" veth_A-R2 2000
+ mtu "${ns_r2}" veth_R2-A 2000
+ mtu "${ns_r2}" veth_R2-B 1500
+ mtu "${ns_b}" veth_B-R2 1500
+
+ # Create route exceptions
+ run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1800 ${dst1}
+ run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1800 ${dst2}
+
+ # Check that exceptions have been created with the correct PMTU
+ pmtu_1="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst1})"
+ check_pmtu_value "1400" "${pmtu_1}" "exceeding MTU" || return 1
+ pmtu_2="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst2})"
+ check_pmtu_value "1500" "${pmtu_2}" "exceeding MTU" || return 1
+
+ # Replace the route from A to R1
+ run_cmd ${ns_a} ip route change default via ${gw}
+
+ # Delete the device in A
+ run_cmd ${ns_a} ip link del "veth_A-R1"
+}
+
+test_pmtu_ipv4_route_change() {
+ test_pmtu_ipvX_route_change 4
+}
+
+test_pmtu_ipv6_route_change() {
+ test_pmtu_ipvX_route_change 6
+}
+
+usage() {
+ echo
+ echo "$0 [OPTIONS] [TEST]..."
+ echo "If no TEST argument is given, all tests will be run."
+ echo
+ echo "Options"
+ echo " --trace: capture traffic to TEST_INTERFACE.pcap"
+ echo
+ echo "Available tests${tests}"
+ exit 1
+}
+
+################################################################################
+#
+exitcode=0
+desc=0
+
+while getopts :ptv o
+do
+ case $o in
+ p) PAUSE_ON_FAIL=yes;;
+ v) VERBOSE=1;;
+ t) if which tcpdump > /dev/null 2>&1; then
+ TRACING=1
+ else
+ echo "=== tcpdump not available, tracing disabled"
+ fi
+ ;;
+ *) usage;;
+ esac
+done
+shift $(($OPTIND-1))
+
+IFS="
+"
+
+for arg do
+ # Check first that all requested tests are available before running any
+ command -v > /dev/null "test_${arg}" || { echo "=== Test ${arg} not found"; usage; }
+done
+
+trap cleanup EXIT
+
+# start clean
+cleanup
+
+HAVE_NH=no
+ip nexthop ls >/dev/null 2>&1
+[ $? -eq 0 ] && HAVE_NH=yes
+
+name=""
+desc=""
+rerun_nh=0
+for t in ${tests}; do
+ [ "${name}" = "" ] && name="${t}" && continue
+ [ "${desc}" = "" ] && desc="${t}" && continue
+
+ if [ "${HAVE_NH}" = "yes" ]; then
+ rerun_nh="${t}"
+ fi
+
+ run_this=1
+ for arg do
+ [ "${arg}" != "${arg#--*}" ] && continue
+ [ "${arg}" = "${name}" ] && run_this=1 && break
+ run_this=0
+ done
+ if [ $run_this -eq 1 ]; then
+ run_test "${name}" "${desc}"
+ # if test was skipped no need to retry with nexthop objects
+ [ $? -eq 2 ] && rerun_nh=0
+
+ if [ "${rerun_nh}" = "1" ]; then
+ run_test_nh "${name}" "${desc}"
+ fi
+ fi
+ name=""
+ desc=""
+ rerun_nh=0
+done
+
+exit ${exitcode}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-01 01:37:19 +0000