diff options
Diffstat (limited to 'tools/testing/selftests/net/pmtu.sh')
| -rwxr-xr-x | tools/testing/selftests/net/pmtu.sh | 207 |
1 files changed, 203 insertions, 4 deletions
diff --git a/tools/testing/selftests/net/pmtu.sh b/tools/testing/selftests/net/pmtu.sh index 03e56a27f69c..b9cdb68df4c5 100755 --- a/tools/testing/selftests/net/pmtu.sh +++ b/tools/testing/selftests/net/pmtu.sh @@ -6,6 +6,26 @@ # # 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_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 @@ -50,6 +70,8 @@ ksft_skip=4 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_vti6_exception vti6: PMTU exceptions pmtu_vti4_exception vti4: PMTU exceptions pmtu_vti4_default_mtu vti4: default MTU assignment @@ -60,8 +82,45 @@ tests=" 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="192.168" +prefix6="fd00" +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" @@ -94,9 +153,15 @@ err_flush() { err_buf= } +# Find the auto-generated name for this namespace +nsname() { + eval echo \$NS_$1 +} + setup_namespaces() { - ip netns add ${NS_A} || return 1 - ip netns add ${NS_B} + for n in ${NS_A} ${NS_B} ${NS_R1} ${NS_R2}; do + ip netns add ${n} || return 1 + done } setup_veth() { @@ -167,6 +232,49 @@ 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 @@ -178,8 +286,9 @@ setup() { cleanup() { [ ${cleanup_done} -eq 1 ] && return - ip netns del ${NS_A} 2> /dev/null - ip netns del ${NS_B} 2> /dev/null + for n in ${NS_A} ${NS_B} ${NS_R1} ${NS_R2}; do + ip netns del ${n} 2> /dev/null + done cleanup_done=1 } @@ -244,6 +353,96 @@ check_pmtu_value() { return 1 } +test_pmtu_ipvX() { + family=${1} + + setup namespaces routing || return 2 + + 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_vti4_exception() { setup namespaces veth vti4 xfrm4 || return 2 |