Commit df40e39c authored by Stefano Brivio's avatar Stefano Brivio Committed by David S. Miller

selftests: pmtu.sh: Add tests for bridged UDP tunnels

The new tests check that IP and IPv6 packets exceeding the local PMTU
estimate, both locally generated and forwarded by a bridge from
another node, result in the correct route exceptions being created,
and that communication with end-to-end fragmentation over VXLAN and
GENEVE tunnels is now possible as a result of PMTU discovery.

Part of the existing setup functions aren't generic enough to simply
add a namespace and a bridge to the existing routing setup. This
rework is in progress and we can easily shrink this once more generic
topology functions are available.
Signed-off-by: default avatarStefano Brivio <sbrivio@redhat.com>
Reviewed-by: default avatarDavid Ahern <dsahern@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent c1a800e8
......@@ -59,6 +59,25 @@
# 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}_fou{4,6}_exception
# Same as pmtu_ipv4_vxlan4, but using a direct IPv4/IPv6 encapsulation
# (FoU) over IPv4/IPv6, instead of VXLAN
......@@ -147,6 +166,14 @@ tests="
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_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
......@@ -173,10 +200,12 @@ tests="
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}"
......@@ -239,9 +268,11 @@ routes_nh="
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"
......@@ -428,7 +459,7 @@ setup_ip6ip6() {
}
setup_namespaces() {
for n in ${NS_A} ${NS_B} ${NS_R1} ${NS_R2}; do
for n in ${NS_A} ${NS_B} ${NS_C} ${NS_R1} ${NS_R2}; do
ip netns add ${n} || return 1
# Disable DAD, so that we don't have to wait to use the
......@@ -484,6 +515,7 @@ setup_vxlan_or_geneve() {
a_addr="${2}"
b_addr="${3}"
opts="${4}"
br_if_a="${5}"
if [ "${type}" = "vxlan" ]; then
opts="${opts} ttl 64 dstport 4789"
......@@ -497,10 +529,16 @@ setup_vxlan_or_geneve() {
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_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
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
......@@ -516,11 +554,27 @@ setup_vxlan4() {
}
setup_geneve6() {
setup_vxlan_or_geneve geneve ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1
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_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() {
......@@ -630,6 +684,20 @@ setup_routing() {
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 ${ns_a} ip link set veth_A-C master br0
}
setup() {
[ "$(id -u)" -ne 0 ] && echo " need to run as root" && return $ksft_skip
......@@ -657,7 +725,7 @@ cleanup() {
done
tcpdump_pids=
for n in ${NS_A} ${NS_B} ${NS_R1} ${NS_R2}; do
for n in ${NS_A} ${NS_B} ${NS_C} ${NS_R1} ${NS_R2}; do
ip netns del ${n} 2> /dev/null
done
}
......@@ -892,6 +960,90 @@ test_pmtu_ipv6_geneve6_exception() {
test_pmtu_ipvX_over_vxlanY_or_geneveY_exception geneve 6 6
}
test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception() {
type=${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 ${type} interface"
}
test_pmtu_ipv4_br_vxlan4_exception() {
test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception vxlan 4 4
}
test_pmtu_ipv6_br_vxlan4_exception() {
test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception vxlan 6 4
}
test_pmtu_ipv4_br_geneve4_exception() {
test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception geneve 4 4
}
test_pmtu_ipv6_br_geneve4_exception() {
test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception geneve 6 4
}
test_pmtu_ipv4_br_vxlan6_exception() {
test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception vxlan 4 6
}
test_pmtu_ipv6_br_vxlan6_exception() {
test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception vxlan 6 6
}
test_pmtu_ipv4_br_geneve6_exception() {
test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception geneve 4 6
}
test_pmtu_ipv6_br_geneve6_exception() {
test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception geneve 6 6
}
test_pmtu_ipvX_over_fouY_or_gueY() {
inner_family=${1}
outer_family=${2}
......
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