| #!/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 |
| |
| # 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_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" |
| |
| 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_addr="fc00:1000::0" |
| dummy6_1_addr="fc00:1001::0" |
| dummy6_mask="64" |
| |
| cleanup_done=1 |
| err_buf= |
| tcpdump_pids= |
| |
| err() { |
| err_buf="${err_buf}${1} |
| " |
| } |
| |
| err_flush() { |
| echo -n "${err_buf}" |
| err_buf= |
| } |
| |
| # 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 |
| |
| ${ns_a} ip fou add port 5555 ipproto ${ipproto} || return 2 |
| ${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 |
| |
| ${ns_b} ip fou add port 5556 ipproto ${ipproto} |
| ${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 |
| ${ns_a} ip addr add ${tunnel4_a_addr}/${tunnel4_mask} dev ${encap}_a |
| ${ns_b} ip addr add ${tunnel4_b_addr}/${tunnel4_mask} dev ${encap}_b |
| else |
| ${ns_a} ip addr add ${tunnel6_a_addr}/${tunnel6_mask} dev ${encap}_a |
| ${ns_b} ip addr add ${tunnel6_b_addr}/${tunnel6_mask} dev ${encap}_b |
| fi |
| |
| ${ns_a} ip link set ${encap}_a up |
| ${ns_b} ip link set ${encap}_b up |
| |
| sleep 1 |
| } |
| |
| 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 |
| done |
| } |
| |
| 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} ${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 |
| |
| ${ns_a} ip link add ${type}_a type ${type} id 1 ${opts_a} remote ${b_addr} ${opts} || return 1 |
| ${ns_b} ip link add ${type}_b type ${type} id 1 ${opts_b} remote ${a_addr} ${opts} |
| |
| ${ns_a} ip addr add ${tunnel4_a_addr}/${tunnel4_mask} dev ${type}_a |
| ${ns_b} ip addr add ${tunnel4_b_addr}/${tunnel4_mask} dev ${type}_b |
| |
| ${ns_a} ip addr add ${tunnel6_a_addr}/${tunnel6_mask} dev ${type}_a |
| ${ns_b} ip addr add ${tunnel6_b_addr}/${tunnel6_mask} dev ${type}_b |
| |
| ${ns_a} ip link set ${type}_a up |
| ${ns_b} ip link set ${type}_b up |
| |
| sleep 1 |
| } |
| |
| 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}" |
| |
| ${ns_a} ip -${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_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 |
| ${ns_a} ${ping} -q -M want -i 0.1 -w 2 -s 1800 ${dst1} > /dev/null |
| ${ns_a} ${ping} -q -M want -i 0.1 -w 2 -s 1800 ${dst2} > /dev/null |
| |
| # Check that exceptions have been created with the correct PMTU |
| pmtu_1="$(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 |
| ${ns_a} ${ping} -q -M want -i 0.1 -w 2 -s 1400 ${dst2} > /dev/null |
| pmtu_2="$(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 |
| ${ns_a} ${ping} -q -M want -i 0.1 -w 2 -s 1400 ${dst2} > /dev/null |
| pmtu_2="$(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)) |
| ${ns_a} ${ping} -q -M want -i 0.1 -w 2 -s $((${ll_mtu} + 500)) ${dst} > /dev/null |
| |
| # Check that exception was created |
| pmtu="$(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)) |
| ${ns_a} ${ping} -q -M want -i 0.1 -w 2 -s $((${ll_mtu} + 500)) ${dst} > /dev/null |
| |
| # Check that exception was created |
| pmtu="$(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 |
| ${ns_a} ping -q -M want -i 0.1 -w 2 -s ${ping_payload} ${tunnel4_b_addr} > /dev/null |
| pmtu="$(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 |
| ${ns_a} ping -q -M want -i 0.1 -w 2 -s $((ping_payload + 1)) ${tunnel4_b_addr} > /dev/null |
| pmtu="$(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 |
| ${ns_a} ${ping6} -q -i 0.1 -w 2 -s 60000 ${tunnel6_b_addr} > /dev/null |
| |
| # Check that exception was created |
| pmtu="$(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 |
| |
| ${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} |
| } |
| |
| 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 |
| IFS=" |
| " |
| |
| tracing=0 |
| for arg do |
| if [ "${arg}" != "${arg#--*}" ]; then |
| opt="${arg#--}" |
| if [ "${opt}" = "trace" ]; then |
| if which tcpdump > /dev/null 2>&1; then |
| tracing=1 |
| else |
| echo "=== tcpdump not available, tracing disabled" |
| fi |
| else |
| usage |
| fi |
| else |
| # Check first that all requested tests are available before |
| # running any |
| command -v > /dev/null "test_${arg}" || { echo "=== Test ${arg} not found"; usage; } |
| fi |
| 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 |
| [ $run_this -eq 0 ] && continue |
| |
| ( |
| unset IFS |
| eval test_${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} |
