| #!/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_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 |
| |
| # Kselftest framework requirement - SKIP code is 4. |
| ksft_skip=4 |
| |
| # Some systems don't have a ping6 binary anymore |
| which ping6 > /dev/null 2>&1 && ping6=$(which ping6) || ping6=$(which ping) |
| |
| tests=" |
| 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" |
| |
| NS_A="ns-$(mktemp -u XXXXXX)" |
| NS_B="ns-$(mktemp -u XXXXXX)" |
| ns_a="ip netns exec ${NS_A}" |
| ns_b="ip netns exec ${NS_B}" |
| |
| veth4_a_addr="192.168.1.1" |
| veth4_b_addr="192.168.1.2" |
| veth4_mask="24" |
| veth6_a_addr="fd00:1::a" |
| veth6_b_addr="fd00:1::b" |
| veth6_mask="64" |
| |
| vti4_a_addr="192.168.2.1" |
| vti4_b_addr="192.168.2.2" |
| vti4_mask="24" |
| vti6_a_addr="fd00:2::a" |
| vti6_b_addr="fd00:2::b" |
| vti6_mask="64" |
| |
| dummy6_0_addr="fc00:1000::0" |
| dummy6_1_addr="fc00:1001::0" |
| dummy6_mask="64" |
| |
| cleanup_done=1 |
| err_buf= |
| |
| err() { |
| err_buf="${err_buf}${1} |
| " |
| } |
| |
| err_flush() { |
| echo -n "${err_buf}" |
| err_buf= |
| } |
| |
| setup_namespaces() { |
| ip netns add ${NS_A} || return 1 |
| ip netns add ${NS_B} |
| } |
| |
| setup_veth() { |
| ${ns_a} ip link add veth_a type veth peer name veth_b || return 1 |
| ${ns_a} ip link set veth_b netns ${NS_B} |
| |
| ${ns_a} ip addr add ${veth4_a_addr}/${veth4_mask} dev veth_a |
| ${ns_b} ip addr add ${veth4_b_addr}/${veth4_mask} dev veth_b |
| |
| ${ns_a} ip addr add ${veth6_a_addr}/${veth6_mask} dev veth_a |
| ${ns_b} ip addr add ${veth6_b_addr}/${veth6_mask} dev veth_b |
| |
| ${ns_a} ip link set veth_a up |
| ${ns_b} ip link set veth_b up |
| } |
| |
| setup_vti() { |
| proto=${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" |
| |
| ${ns_a} ip link add vti${proto}_a type ${vti_type} local ${veth_a_addr} remote ${veth_b_addr} key 10 || return 1 |
| ${ns_b} ip link add vti${proto}_b type ${vti_type} local ${veth_b_addr} remote ${veth_a_addr} key 10 |
| |
| ${ns_a} ip addr add ${vti_a_addr}/${vti_mask} dev vti${proto}_a |
| ${ns_b} ip addr add ${vti_b_addr}/${vti_mask} dev vti${proto}_b |
| |
| ${ns_a} ip link set vti${proto}_a up |
| ${ns_b} ip link set vti${proto}_b up |
| |
| sleep 1 |
| } |
| |
| setup_vti4() { |
| setup_vti 4 ${veth4_a_addr} ${veth4_b_addr} ${vti4_a_addr} ${vti4_b_addr} ${vti4_mask} |
| } |
| |
| setup_vti6() { |
| setup_vti 6 ${veth6_a_addr} ${veth6_b_addr} ${vti6_a_addr} ${vti6_b_addr} ${vti6_mask} |
| } |
| |
| setup_xfrm() { |
| proto=${1} |
| veth_a_addr="${2}" |
| veth_b_addr="${3}" |
| |
| ${ns_a} ip -${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 |
| ${ns_a} ip -${proto} xfrm state add src ${veth_b_addr} dst ${veth_a_addr} spi 0x1001 proto esp aead "rfc4106(gcm(aes))" 0x0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f 128 mode tunnel |
| ${ns_a} ip -${proto} xfrm policy add dir out mark 10 tmpl src ${veth_a_addr} dst ${veth_b_addr} proto esp mode tunnel |
| ${ns_a} ip -${proto} xfrm policy add dir in mark 10 tmpl src ${veth_b_addr} dst ${veth_a_addr} proto esp mode tunnel |
| |
| ${ns_b} ip -${proto} xfrm state add src ${veth_a_addr} dst ${veth_b_addr} spi 0x1000 proto esp aead "rfc4106(gcm(aes))" 0x0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f 128 mode tunnel |
| ${ns_b} ip -${proto} xfrm state add src ${veth_b_addr} dst ${veth_a_addr} spi 0x1001 proto esp aead "rfc4106(gcm(aes))" 0x0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f0f 128 mode tunnel |
| ${ns_b} ip -${proto} xfrm policy add dir out mark 10 tmpl src ${veth_b_addr} dst ${veth_a_addr} proto esp mode tunnel |
| ${ns_b} ip -${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} ${veth6_b_addr} |
| } |
| |
| setup() { |
| [ "$(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 |
| } |
| |
| cleanup() { |
| [ ${cleanup_done} -eq 1 ] && return |
| ip netns del ${NS_A} 2> /dev/null |
| ip netns del ${NS_B} 2> /dev/null |
| cleanup_done=1 |
| } |
| |
| mtu() { |
| ns_cmd="${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 |
| [ ${next} -eq 1 ] && echo "${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}" ${dst})" |
| } |
| |
| test_pmtu_vti4_exception() { |
| setup namespaces veth vti4 xfrm4 || return 2 |
| |
| veth_mtu=1500 |
| vti_mtu=$((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 |
| ${ns_a} ping -q -M want -i 0.1 -w 2 -s ${ping_payload} ${vti4_b_addr} > /dev/null |
| pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${vti4_b_addr})" |
| if [ "${pmtu}" != "" ]; then |
| err " unexpected exception created with PMTU ${pmtu} for IP payload length ${esp_payload_rfc4106}" |
| return 1 |
| fi |
| |
| # Now exceed link layer MTU by one byte, check that exception is created |
| ${ns_a} ping -q -M want -i 0.1 -w 2 -s $((ping_payload + 1)) ${vti4_b_addr} > /dev/null |
| pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${vti4_b_addr})" |
| if [ "${pmtu}" = "" ]; then |
| err " exception not created for IP payload length $((esp_payload_rfc4106 + 1))" |
| return 1 |
| fi |
| |
| # ...with the right PMTU value |
| if [ ${pmtu} -ne ${esp_payload_rfc4106} ]; then |
| err " wrong PMTU ${pmtu} in exception, expected: ${esp_payload_rfc4106}" |
| return 1 |
| fi |
| } |
| |
| test_pmtu_vti6_exception() { |
| setup namespaces veth vti6 xfrm6 || return 2 |
| fail=0 |
| |
| # Create route exception by exceeding link layer MTU |
| mtu "${ns_a}" veth_a 4000 |
| mtu "${ns_b}" veth_b 4000 |
| mtu "${ns_a}" vti6_a 5000 |
| mtu "${ns_b}" vti6_b 5000 |
| ${ns_a} ${ping6} -q -i 0.1 -w 2 -s 60000 ${vti6_b_addr} > /dev/null |
| |
| # Check that exception was created |
| if [ "$(route_get_dst_pmtu_from_exception "${ns_a}" ${vti6_b_addr})" = "" ]; then |
| err " tunnel exceeding link layer MTU didn't create route exception" |
| return 1 |
| fi |
| |
| # Decrease tunnel MTU, check for PMTU decrease in route exception |
| mtu "${ns_a}" vti6_a 3000 |
| |
| if [ "$(route_get_dst_pmtu_from_exception "${ns_a}" ${vti6_b_addr})" -ne 3000 ]; then |
| err " decreasing tunnel MTU didn't decrease route exception PMTU" |
| fail=1 |
| fi |
| |
| # Increase tunnel MTU, check for PMTU increase in route exception |
| mtu "${ns_a}" vti6_a 9000 |
| if [ "$(route_get_dst_pmtu_from_exception "${ns_a}" ${vti6_b_addr})" -ne 9000 ]; then |
| err " increasing tunnel MTU didn't increase route exception PMTU" |
| fail=1 |
| fi |
| |
| 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 |
| |
| ${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 |
| ${ns_a} ip link del vti4_a |
| |
| fail=0 |
| |
| min=68 |
| max=$((65535 - 20)) |
| # Check invalid values first |
| for v in $((min - 1)) $((max + 1)); do |
| ${ns_a} ip link add vti4_a mtu ${v} type vti local ${veth4_a_addr} remote ${veth4_b_addr} key 10 2>/dev/null |
| # 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 |
| ${ns_a} ip link del vti4_a |
| done |
| |
| # Now check valid values |
| for v in ${min} 1300 ${max}; do |
| ${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)" |
| ${ns_a} ip link del vti4_a |
| if [ "${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 |
| |
| ${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 |
| ${ns_a} ip link del vti6_a |
| |
| fail=0 |
| |
| min=68 # vti6 can carry IPv4 packets too |
| max=$((65535 - 40)) |
| # Check invalid values first |
| for v in $((min - 1)) $((max + 1)); do |
| ${ns_a} ip link add vti6_a mtu ${v} type vti6 local ${veth6_a_addr} remote ${veth6_b_addr} key 10 2>/dev/null |
| # 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 |
| ${ns_a} ip link del vti6_a |
| done |
| |
| # Now check valid values |
| for v in 68 1280 1300 $((65535 - 40)); do |
| ${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)" |
| ${ns_a} ip link del vti6_a |
| if [ "${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 |
| |
| ${ns_a} ip link add dummy0 mtu 1500 type dummy |
| [ $? -ne 0 ] && err " dummy not supported" && return 2 |
| ${ns_a} ip link add dummy1 mtu 3000 type dummy |
| ${ns_a} ip link set dummy0 up |
| ${ns_a} ip link set dummy1 up |
| |
| ${ns_a} ip addr add ${dummy6_0_addr}/${dummy6_mask} dev dummy0 |
| ${ns_a} ip addr add ${dummy6_1_addr}/${dummy6_mask} dev dummy1 |
| |
| fail=0 |
| |
| # Create vti6 interface bound to device, passing MTU, check it |
| ${ns_a} ip link add vti6_a mtu 1300 type vti6 remote ${dummy6_0_addr} local ${dummy6_0_addr} |
| mtu="$(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 |
| ${ns_a} ip link set vti6_a type vti6 remote ${dummy6_1_addr} local ${dummy6_1_addr} |
| mtu="$(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 |
| ${ns_a} ip link set vti6_a mtu 1280 type vti6 remote ${dummy6_0_addr} local ${dummy6_0_addr} |
| mtu="$(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} |
| } |
| |
| trap cleanup EXIT |
| |
| exitcode=0 |
| desc=0 |
| IFS=" |
| " |
| for t in ${tests}; do |
| [ $desc -eq 0 ] && name="${t}" && desc=1 && continue || desc=0 |
| |
| ( |
| unset IFS |
| 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}" |
| 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} |
