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linux_dsm_epyc7002/tools/testing/selftests/net/pmtu.sh
Stefano Brivio 73f51d151e selftests: pmtu: Fix encapsulating device in pmtu_vti6_link_change_mtu 
In the pmtu_vti6_link_change_mtu test, both local and remote addresses
for the vti6 tunnel are assigned to the same address given to the dummy
interface that we use as encapsulating device with a known MTU.

This works as long as the dummy interface is actually selected, via
rt6_lookup(), as encapsulating device. But if the remote address of the
tunnel is a local address too, the loopback interface could also be
selected, and there's nothing wrong with it.

This is what some older -stable kernels do (3.18.z, at least), and
nothing prevents us from subtly changing FIB implementation to revert
back to that behaviour in the future.

Define an IPv6 prefix instead, and use two separate addresses as local
and remote for vti6, so that the encapsulating device can't be a
loopback interface.

Reported-by: Xiumei Mu <xmu@redhat.com>
Fixes: 1fad59ea1c ("selftests: pmtu: Add pmtu_vti6_link_change_mtu test")
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2019-05-28 17:15:06 -07:00

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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--------------. a_r2: 1500
# A B a_r3: 2000
# '--------------R2--------------' a_r4: 1400
# 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}_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_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
# 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)
tests="
pmtu_ipv4_exception ipv4: PMTU exceptions
pmtu_ipv6_exception ipv6: PMTU exceptions
pmtu_ipv4_vxlan4_exception IPv4 over vxlan4: PMTU exceptions
pmtu_ipv6_vxlan4_exception IPv6 over vxlan4: PMTU exceptions
pmtu_ipv4_vxlan6_exception IPv4 over vxlan6: PMTU exceptions
pmtu_ipv6_vxlan6_exception IPv6 over vxlan6: PMTU exceptions
pmtu_ipv4_geneve4_exception IPv4 over geneve4: PMTU exceptions
pmtu_ipv6_geneve4_exception IPv6 over geneve4: PMTU exceptions
pmtu_ipv4_geneve6_exception IPv4 over geneve6: PMTU exceptions
pmtu_ipv6_geneve6_exception IPv6 over geneve6: PMTU exceptions
pmtu_ipv4_fou4_exception IPv4 over fou4: PMTU exceptions
pmtu_ipv6_fou4_exception IPv6 over fou4: PMTU exceptions
pmtu_ipv4_fou6_exception IPv4 over fou6: PMTU exceptions
pmtu_ipv6_fou6_exception IPv6 over fou6: PMTU exceptions
pmtu_ipv4_gue4_exception IPv4 over gue4: PMTU exceptions
pmtu_ipv6_gue4_exception IPv6 over gue4: PMTU exceptions
pmtu_ipv4_gue6_exception IPv4 over gue6: PMTU exceptions
pmtu_ipv6_gue6_exception IPv6 over gue6: PMTU exceptions
pmtu_vti6_exception vti6: PMTU exceptions
pmtu_vti4_exception vti4: PMTU exceptions
pmtu_vti4_default_mtu vti4: default MTU assignment
pmtu_vti6_default_mtu vti6: default MTU assignment
pmtu_vti4_link_add_mtu vti4: MTU setting on link creation
pmtu_vti6_link_add_mtu vti6: MTU setting on link creation
pmtu_vti6_link_change_mtu vti6: MTU changes on link changes
cleanup_ipv4_exception ipv4: cleanup of cached exceptions
cleanup_ipv6_exception ipv6: cleanup of cached exceptions"
NS_A="ns-$(mktemp -u XXXXXX)"
NS_B="ns-$(mktemp -u XXXXXX)"
NS_R1="ns-$(mktemp -u XXXXXX)"
NS_R2="ns-$(mktemp -u XXXXXX)"
ns_a="ip netns exec ${NS_A}"
ns_b="ip netns exec ${NS_B}"
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
"
veth4_a_addr="192.168.1.1"
veth4_b_addr="192.168.1.2"
veth4_mask="24"
veth6_a_addr="fd00:1::a"
veth6_b_addr="fd00:1::b"
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"
cleanup_done=1
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_namespaces() {
for n in ${NS_A} ${NS_B} ${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="${4}"
if [ "${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}
run_cmd ${ns_a} ip addr add ${tunnel4_a_addr}/${tunnel4_mask} dev ${type}_a
run_cmd ${ns_b} ip addr add ${tunnel4_b_addr}/${tunnel4_mask} dev ${type}_b
run_cmd ${ns_a} ip addr add ${tunnel6_a_addr}/${tunnel6_mask} dev ${type}_a
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_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() {
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
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 ${gw}
ns=""; addr=""; gw=""
done
}
setup() {
[ "$(id -u)" -ne 0 ] && echo " need to run as root" && return $ksft_skip
cleanup_done=0
for arg do
eval setup_${arg} || { echo " ${arg} not supported"; return 1; }
done
}
trace() {
[ $TRACING -eq 0 ] && return
for arg do
[ "${ns_cmd}" = "" ] && ns_cmd="${arg}" && continue
${ns_cmd} tcpdump -s 0 -i "${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=
[ ${cleanup_done} -eq 1 ] && return
for n in ${NS_A} ${NS_B} ${NS_R1} ${NS_R2}; do
ip netns del ${n} 2> /dev/null
done
cleanup_done=1
}
mtu() {
ns_cmd="${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 ${type} interface"
}
test_pmtu_ipv4_vxlan4_exception() {
test_pmtu_ipvX_over_vxlanY_or_geneveY_exception vxlan 4 4
}
test_pmtu_ipv6_vxlan4_exception() {
test_pmtu_ipvX_over_vxlanY_or_geneveY_exception vxlan 6 4
}
test_pmtu_ipv4_geneve4_exception() {
test_pmtu_ipvX_over_vxlanY_or_geneveY_exception geneve 4 4
}
test_pmtu_ipv6_geneve4_exception() {
test_pmtu_ipvX_over_vxlanY_or_geneveY_exception geneve 6 4
}
test_pmtu_ipv4_vxlan6_exception() {
test_pmtu_ipvX_over_vxlanY_or_geneveY_exception vxlan 4 6
}
test_pmtu_ipv6_vxlan6_exception() {
test_pmtu_ipvX_over_vxlanY_or_geneveY_exception vxlan 6 6
}
test_pmtu_ipv4_geneve6_exception() {
test_pmtu_ipvX_over_vxlanY_or_geneveY_exception geneve 4 6
}
test_pmtu_ipv6_geneve6_exception() {
test_pmtu_ipvX_over_vxlanY_or_geneveY_exception geneve 6 6
}
test_pmtu_ipvX_over_fouY_or_gueY() {
inner_family=${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 ${encap} interface"
}
test_pmtu_ipv4_fou4_exception() {
test_pmtu_ipvX_over_fouY_or_gueY 4 4 fou
}
test_pmtu_ipv6_fou4_exception() {
test_pmtu_ipvX_over_fouY_or_gueY 6 4 fou
}
test_pmtu_ipv4_fou6_exception() {
test_pmtu_ipvX_over_fouY_or_gueY 4 6 fou
}
test_pmtu_ipv6_fou6_exception() {
test_pmtu_ipvX_over_fouY_or_gueY 6 6 fou
}
test_pmtu_ipv4_gue4_exception() {
test_pmtu_ipvX_over_fouY_or_gueY 4 4 gue
}
test_pmtu_ipv6_gue4_exception() {
test_pmtu_ipvX_over_fouY_or_gueY 6 4 gue
}
test_pmtu_ipv4_gue6_exception() {
test_pmtu_ipvX_over_fouY_or_gueY 4 6 gue
}
test_pmtu_ipv6_gue6_exception() {
test_pmtu_ipvX_over_fouY_or_gueY 6 6 gue
}
test_pmtu_vti4_exception() {
setup namespaces veth vti4 xfrm4 || return 2
trace "${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
}
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
for t in ${tests}; do
[ $desc -eq 0 ] && name="${t}" && desc=1 && continue || desc=0
run_this=1
for arg do
[ "${arg}" != "${arg#--*}" ] && continue
[ "${arg}" = "${name}" ] && run_this=1 && break
run_this=0
done
[ $run_this -eq 0 ] && continue
(
unset IFS
if [ "$VERBOSE" = "1" ]; then
printf "\n##########################################################################\n\n"
fi
eval test_${name}
ret=$?
cleanup
if [ $ret -eq 0 ]; then
printf "TEST: %-60s [ OK ]\n" "${t}"
elif [ $ret -eq 1 ]; then
printf "TEST: %-60s [FAIL]\n" "${t}"
if [ "${PAUSE_ON_FAIL}" = "yes" ]; then
echo
echo "Pausing. Hit enter to continue"
read a
fi
err_flush
exit 1
elif [ $ret -eq 2 ]; then
printf "TEST: %-60s [SKIP]\n" "${t}"
err_flush
fi
)
[ $? -ne 0 ] && exitcode=1
done
exit ${exitcode}
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