selftests: pmtu: Add pmtu_vti4_default_mtu test
This test checks that the MTU assigned by default to a vti (IPv4) interface created on top of veth is simply veth's MTU minus the length of the encapsulated IPv4 header. Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stefano Brivio
David S. Miller
parent
36455bd1e9
commit
a41c789bdc
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@ -1,7 +1,8 @@
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#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0
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#
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# Check that route PMTU values match expectations
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# Check that route PMTU values match expectations, and that initial device MTU
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# values are assigned correctly
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#
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# Tests currently implemented:
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#
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@ -11,19 +12,32 @@
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# created by exceeding link layer MTU with ping to other endpoint. Then
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# decrease and increase MTU of tunnel, checking that route exception PMTU
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# changes accordingly
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#
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# - pmtu_vti4_default_mtu
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# Set up vti4 tunnel on top of veth, in two namespaces with matching
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# endpoints. Check that MTU assigned to vti interface is the MTU of the
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# lower layer (veth) minus additional lower layer headers (zero, for veth)
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# minus IPv4 header length
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tests="
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pmtu_vti6_exception vti6: PMTU exceptions"
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pmtu_vti6_exception vti6: PMTU exceptions
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pmtu_vti4_default_mtu vti4: default MTU assignment"
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NS_A="ns-$(mktemp -u XXXXXX)"
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NS_B="ns-$(mktemp -u XXXXXX)"
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ns_a="ip netns exec ${NS_A}"
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ns_b="ip netns exec ${NS_B}"
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veth4_a_addr="192.168.1.1"
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veth4_b_addr="192.168.1.2"
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veth4_mask="24"
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veth6_a_addr="fd00:1::a"
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veth6_b_addr="fd00:1::b"
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veth6_mask="64"
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vti4_a_addr="192.168.2.1"
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vti4_b_addr="192.168.2.2"
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vti4_mask="24"
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vti6_a_addr="fd00:2::a"
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vti6_b_addr="fd00:2::b"
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vti6_mask="64"
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@ -50,6 +64,9 @@ setup_veth() {
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${ns_a} ip link add veth_a type veth peer name veth_b || return 1
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${ns_a} ip link set veth_b netns ${NS_B}
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${ns_a} ip addr add ${veth4_a_addr}/${veth4_mask} dev veth_a
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${ns_b} ip addr add ${veth4_b_addr}/${veth4_mask} dev veth_b
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${ns_a} ip addr add ${veth6_a_addr}/${veth6_mask} dev veth_a
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${ns_b} ip addr add ${veth6_b_addr}/${veth6_mask} dev veth_b
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@ -57,19 +74,36 @@ setup_veth() {
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${ns_b} ip link set veth_b up
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}
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setup_vti6() {
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${ns_a} ip link add vti_a type vti6 local ${veth6_a_addr} remote ${veth6_b_addr} key 10 || return 1
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${ns_b} ip link add vti_b type vti6 local ${veth6_b_addr} remote ${veth6_a_addr} key 10
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setup_vti() {
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proto=${1}
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veth_a_addr="${2}"
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veth_b_addr="${3}"
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vti_a_addr="${4}"
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vti_b_addr="${5}"
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vti_mask=${6}
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${ns_a} ip addr add ${vti6_a_addr}/${vti6_mask} dev vti_a
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${ns_b} ip addr add ${vti6_b_addr}/${vti6_mask} dev vti_b
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[ ${proto} -eq 6 ] && vti_type="vti6" || vti_type="vti"
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${ns_a} ip link set vti_a up
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${ns_b} ip link set vti_b up
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${ns_a} ip link add vti${proto}_a type ${vti_type} local ${veth_a_addr} remote ${veth_b_addr} key 10 || return 1
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${ns_b} ip link add vti${proto}_b type ${vti_type} local ${veth_b_addr} remote ${veth_a_addr} key 10
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${ns_a} ip addr add ${vti_a_addr}/${vti_mask} dev vti${proto}_a
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${ns_b} ip addr add ${vti_b_addr}/${vti_mask} dev vti${proto}_b
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${ns_a} ip link set vti${proto}_a up
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${ns_b} ip link set vti${proto}_b up
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sleep 1
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}
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setup_vti4() {
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setup_vti 4 ${veth4_a_addr} ${veth4_b_addr} ${vti4_a_addr} ${vti4_b_addr} ${vti4_mask}
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}
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setup_vti6() {
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setup_vti 6 ${veth6_a_addr} ${veth6_b_addr} ${vti6_a_addr} ${vti6_b_addr} ${vti6_mask}
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}
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setup_xfrm() {
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${ns_a} ip -6 xfrm state add src ${veth6_a_addr} dst ${veth6_b_addr} spi 0x1000 proto esp aead "rfc4106(gcm(aes))" 0x0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f 128 mode tunnel || return 1
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${ns_a} ip -6 xfrm state add src ${veth6_b_addr} dst ${veth6_a_addr} spi 0x1001 proto esp aead "rfc4106(gcm(aes))" 0x0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f 128 mode tunnel
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@ -116,6 +150,20 @@ mtu_parse() {
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done
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}
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link_get() {
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ns_cmd="${1}"
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name="${2}"
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${ns_cmd} ip link show dev "${name}"
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}
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link_get_mtu() {
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ns_cmd="${1}"
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name="${2}"
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mtu_parse "$(link_get "${ns_cmd}" ${name})"
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}
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route_get_dst_exception() {
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ns_cmd="${1}"
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dst="${2}"
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@ -137,8 +185,8 @@ test_pmtu_vti6_exception() {
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# Create route exception by exceeding link layer MTU
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mtu "${ns_a}" veth_a 4000
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mtu "${ns_b}" veth_b 4000
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mtu "${ns_a}" vti_a 5000
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mtu "${ns_b}" vti_b 5000
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mtu "${ns_a}" vti6_a 5000
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mtu "${ns_b}" vti6_b 5000
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${ns_a} ping6 -q -i 0.1 -w 2 -s 60000 ${vti6_b_addr} > /dev/null
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# Check that exception was created
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@ -148,7 +196,7 @@ test_pmtu_vti6_exception() {
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fi
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# Decrease tunnel MTU, check for PMTU decrease in route exception
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mtu "${ns_a}" vti_a 3000
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mtu "${ns_a}" vti6_a 3000
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if [ "$(route_get_dst_pmtu_from_exception "${ns_a}" ${vti6_b_addr})" -ne 3000 ]; then
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err " decreasing tunnel MTU didn't decrease route exception PMTU"
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@ -156,7 +204,7 @@ test_pmtu_vti6_exception() {
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fi
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# Increase tunnel MTU, check for PMTU increase in route exception
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mtu "${ns_a}" vti_a 9000
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mtu "${ns_a}" vti6_a 9000
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if [ "$(route_get_dst_pmtu_from_exception "${ns_a}" ${vti6_b_addr})" -ne 9000 ]; then
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err " increasing tunnel MTU didn't increase route exception PMTU"
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fail=1
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@ -165,6 +213,18 @@ test_pmtu_vti6_exception() {
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return ${fail}
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}
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test_pmtu_vti4_default_mtu() {
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setup namespaces veth vti4 || return 2
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# Check that MTU of vti device is MTU of veth minus IPv4 header length
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veth_mtu="$(link_get_mtu "${ns_a}" veth_a)"
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vti4_mtu="$(link_get_mtu "${ns_a}" vti4_a)"
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if [ $((veth_mtu - vti4_mtu)) -ne 20 ]; then
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err " vti MTU ${vti4_mtu} is not veth MTU ${veth_mtu} minus IPv4 header length"
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return 1
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fi
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}
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trap cleanup EXIT
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exitcode=0
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