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: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: David Ahern <dsahern@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stefano Brivio
David S. Miller
Родитель
c1a800e88d
Коммит
df40e39c0d
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@ -59,6 +59,25 @@
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# Same as pmtu_ipv6_vxlan6_exception, but using a GENEVE tunnel instead of
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# VXLAN
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#
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# - pmtu_ipv{4,6}_br_vxlan{4,6}_exception
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# Set up three namespaces, A, B, and C, with routing between A and B over
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# R1. R2 is unused in these tests. A has a veth connection to C, and is
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# connected to B via a VXLAN endpoint, which is directly bridged to C.
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# MTU on the B-R1 link is lower than other MTUs.
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#
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# Check that both C and A are able to communicate with B over the VXLAN
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# tunnel, and that PMTU exceptions with the correct values are created.
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#
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# segment a_r1 segment b_r1 b_r1: 4000
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# .--------------R1--------------. everything
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# C---veth A B else: 5000
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# ' bridge |
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# '---- - - - - - VXLAN - - - - - - - '
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#
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# - pmtu_ipv{4,6}_br_geneve{4,6}_exception
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# Same as pmtu_ipv{4,6}_br_vxlan{4,6}_exception, with a GENEVE tunnel
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# instead.
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#
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# - pmtu_ipv{4,6}_fou{4,6}_exception
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# Same as pmtu_ipv4_vxlan4, but using a direct IPv4/IPv6 encapsulation
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# (FoU) over IPv4/IPv6, instead of VXLAN
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@ -147,6 +166,14 @@ tests="
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pmtu_ipv6_geneve4_exception IPv6 over geneve4: PMTU exceptions 1
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pmtu_ipv4_geneve6_exception IPv4 over geneve6: PMTU exceptions 1
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pmtu_ipv6_geneve6_exception IPv6 over geneve6: PMTU exceptions 1
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pmtu_ipv4_br_vxlan4_exception IPv4, bridged vxlan4: PMTU exceptions 1
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pmtu_ipv6_br_vxlan4_exception IPv6, bridged vxlan4: PMTU exceptions 1
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pmtu_ipv4_br_vxlan6_exception IPv4, bridged vxlan6: PMTU exceptions 1
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pmtu_ipv6_br_vxlan6_exception IPv6, bridged vxlan6: PMTU exceptions 1
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pmtu_ipv4_br_geneve4_exception IPv4, bridged geneve4: PMTU exceptions 1
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pmtu_ipv6_br_geneve4_exception IPv6, bridged geneve4: PMTU exceptions 1
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pmtu_ipv4_br_geneve6_exception IPv4, bridged geneve6: PMTU exceptions 1
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pmtu_ipv6_br_geneve6_exception IPv6, bridged geneve6: PMTU exceptions 1
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pmtu_ipv4_fou4_exception IPv4 over fou4: PMTU exceptions 1
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pmtu_ipv6_fou4_exception IPv6 over fou4: PMTU exceptions 1
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pmtu_ipv4_fou6_exception IPv4 over fou6: PMTU exceptions 1
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@ -173,10 +200,12 @@ tests="
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NS_A="ns-A"
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NS_B="ns-B"
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NS_C="ns-C"
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NS_R1="ns-R1"
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NS_R2="ns-R2"
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ns_a="ip netns exec ${NS_A}"
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ns_b="ip netns exec ${NS_B}"
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ns_c="ip netns exec ${NS_C}"
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ns_r1="ip netns exec ${NS_R1}"
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ns_r2="ip netns exec ${NS_R2}"
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@ -239,9 +268,11 @@ routes_nh="
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veth4_a_addr="192.168.1.1"
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veth4_b_addr="192.168.1.2"
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veth4_c_addr="192.168.2.10"
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veth4_mask="24"
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veth6_a_addr="fd00:1::a"
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veth6_b_addr="fd00:1::b"
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veth6_c_addr="fd00:2::c"
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veth6_mask="64"
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tunnel4_a_addr="192.168.2.1"
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@ -428,7 +459,7 @@ setup_ip6ip6() {
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}
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setup_namespaces() {
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for n in ${NS_A} ${NS_B} ${NS_R1} ${NS_R2}; do
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for n in ${NS_A} ${NS_B} ${NS_C} ${NS_R1} ${NS_R2}; do
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ip netns add ${n} || return 1
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# Disable DAD, so that we don't have to wait to use the
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@ -484,6 +515,7 @@ setup_vxlan_or_geneve() {
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a_addr="${2}"
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b_addr="${3}"
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opts="${4}"
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br_if_a="${5}"
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if [ "${type}" = "vxlan" ]; then
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opts="${opts} ttl 64 dstport 4789"
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@ -497,10 +529,16 @@ setup_vxlan_or_geneve() {
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run_cmd ${ns_a} ip link add ${type}_a type ${type} id 1 ${opts_a} remote ${b_addr} ${opts} || return 1
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run_cmd ${ns_b} ip link add ${type}_b type ${type} id 1 ${opts_b} remote ${a_addr} ${opts}
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run_cmd ${ns_a} ip addr add ${tunnel4_a_addr}/${tunnel4_mask} dev ${type}_a
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run_cmd ${ns_b} ip addr add ${tunnel4_b_addr}/${tunnel4_mask} dev ${type}_b
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if [ -n "${br_if_a}" ]; then
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run_cmd ${ns_a} ip addr add ${tunnel4_a_addr}/${tunnel4_mask} dev ${br_if_a}
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run_cmd ${ns_a} ip addr add ${tunnel6_a_addr}/${tunnel6_mask} dev ${br_if_a}
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run_cmd ${ns_a} ip link set ${type}_a master ${br_if_a}
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else
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run_cmd ${ns_a} ip addr add ${tunnel4_a_addr}/${tunnel4_mask} dev ${type}_a
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run_cmd ${ns_a} ip addr add ${tunnel6_a_addr}/${tunnel6_mask} dev ${type}_a
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fi
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run_cmd ${ns_a} ip addr add ${tunnel6_a_addr}/${tunnel6_mask} dev ${type}_a
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run_cmd ${ns_b} ip addr add ${tunnel4_b_addr}/${tunnel4_mask} dev ${type}_b
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run_cmd ${ns_b} ip addr add ${tunnel6_b_addr}/${tunnel6_mask} dev ${type}_b
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run_cmd ${ns_a} ip link set ${type}_a up
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@ -516,11 +554,27 @@ setup_vxlan4() {
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}
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setup_geneve6() {
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setup_vxlan_or_geneve geneve ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1
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setup_vxlan_or_geneve geneve ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 ""
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}
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setup_vxlan6() {
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setup_vxlan_or_geneve vxlan ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1
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setup_vxlan_or_geneve vxlan ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 ""
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}
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setup_bridged_geneve4() {
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setup_vxlan_or_geneve geneve ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1 "df set" "br0"
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}
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setup_bridged_vxlan4() {
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setup_vxlan_or_geneve vxlan ${prefix4}.${a_r1}.1 ${prefix4}.${b_r1}.1 "df set" "br0"
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}
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setup_bridged_geneve6() {
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setup_vxlan_or_geneve geneve ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 "" "br0"
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}
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setup_bridged_vxlan6() {
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setup_vxlan_or_geneve vxlan ${prefix6}:${a_r1}::1 ${prefix6}:${b_r1}::1 "" "br0"
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}
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setup_xfrm() {
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@ -630,6 +684,20 @@ setup_routing() {
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return 0
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}
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setup_bridge() {
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run_cmd ${ns_a} ip link add br0 type bridge || return 2
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run_cmd ${ns_a} ip link set br0 up
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run_cmd ${ns_c} ip link add veth_C-A type veth peer name veth_A-C
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run_cmd ${ns_c} ip link set veth_A-C netns ns-A
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run_cmd ${ns_a} ip link set veth_A-C up
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run_cmd ${ns_c} ip link set veth_C-A up
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run_cmd ${ns_c} ip addr add ${veth4_c_addr}/${veth4_mask} dev veth_C-A
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run_cmd ${ns_c} ip addr add ${veth6_c_addr}/${veth6_mask} dev veth_C-A
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run_cmd ${ns_a} ip link set veth_A-C master br0
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}
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setup() {
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[ "$(id -u)" -ne 0 ] && echo " need to run as root" && return $ksft_skip
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@ -657,7 +725,7 @@ cleanup() {
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done
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tcpdump_pids=
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for n in ${NS_A} ${NS_B} ${NS_R1} ${NS_R2}; do
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for n in ${NS_A} ${NS_B} ${NS_C} ${NS_R1} ${NS_R2}; do
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ip netns del ${n} 2> /dev/null
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done
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}
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@ -892,6 +960,90 @@ test_pmtu_ipv6_geneve6_exception() {
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test_pmtu_ipvX_over_vxlanY_or_geneveY_exception geneve 6 6
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}
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test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception() {
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type=${1}
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family=${2}
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outer_family=${3}
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ll_mtu=4000
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if [ ${outer_family} -eq 4 ]; then
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setup namespaces routing bridge bridged_${type}4 || return 2
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# IPv4 header UDP header VXLAN/GENEVE header Ethernet header
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exp_mtu=$((${ll_mtu} - 20 - 8 - 8 - 14))
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else
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setup namespaces routing bridge bridged_${type}6 || return 2
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# IPv6 header UDP header VXLAN/GENEVE header Ethernet header
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exp_mtu=$((${ll_mtu} - 40 - 8 - 8 - 14))
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fi
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trace "${ns_a}" ${type}_a "${ns_b}" ${type}_b \
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"${ns_a}" veth_A-R1 "${ns_r1}" veth_R1-A \
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"${ns_b}" veth_B-R1 "${ns_r1}" veth_R1-B \
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"${ns_a}" br0 "${ns_a}" veth-A-C \
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"${ns_c}" veth_C-A
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if [ ${family} -eq 4 ]; then
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ping=ping
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dst=${tunnel4_b_addr}
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else
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ping=${ping6}
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dst=${tunnel6_b_addr}
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fi
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# Create route exception by exceeding link layer MTU
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mtu "${ns_a}" veth_A-R1 $((${ll_mtu} + 1000))
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mtu "${ns_a}" br0 $((${ll_mtu} + 1000))
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mtu "${ns_a}" veth_A-C $((${ll_mtu} + 1000))
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mtu "${ns_c}" veth_C-A $((${ll_mtu} + 1000))
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mtu "${ns_r1}" veth_R1-A $((${ll_mtu} + 1000))
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mtu "${ns_b}" veth_B-R1 ${ll_mtu}
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mtu "${ns_r1}" veth_R1-B ${ll_mtu}
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mtu "${ns_a}" ${type}_a $((${ll_mtu} + 1000))
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mtu "${ns_b}" ${type}_b $((${ll_mtu} + 1000))
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run_cmd ${ns_c} ${ping} -q -M want -i 0.1 -c 10 -s $((${ll_mtu} + 500)) ${dst} || return 1
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run_cmd ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${dst} || return 1
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# Check that exceptions were created
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pmtu="$(route_get_dst_pmtu_from_exception "${ns_c}" ${dst})"
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check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on bridged ${type} interface"
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pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst})"
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check_pmtu_value ${exp_mtu} "${pmtu}" "exceeding link layer MTU on locally bridged ${type} interface"
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}
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test_pmtu_ipv4_br_vxlan4_exception() {
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test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception vxlan 4 4
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}
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test_pmtu_ipv6_br_vxlan4_exception() {
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test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception vxlan 6 4
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}
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test_pmtu_ipv4_br_geneve4_exception() {
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test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception geneve 4 4
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}
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test_pmtu_ipv6_br_geneve4_exception() {
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test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception geneve 6 4
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}
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test_pmtu_ipv4_br_vxlan6_exception() {
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test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception vxlan 4 6
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}
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test_pmtu_ipv6_br_vxlan6_exception() {
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test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception vxlan 6 6
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}
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test_pmtu_ipv4_br_geneve6_exception() {
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test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception geneve 4 6
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}
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test_pmtu_ipv6_br_geneve6_exception() {
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test_pmtu_ipvX_over_bridged_vxlanY_or_geneveY_exception geneve 6 6
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}
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test_pmtu_ipvX_over_fouY_or_gueY() {
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inner_family=${1}
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outer_family=${2}
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