From 651eb32e569e50564803891cf2a8d22e49e979a5 Mon Sep 17 00:00:00 2001 From: Paolo Abeni Date: Mon, 25 Feb 2019 16:08:36 +0100 Subject: selftests: pmtu: disable DAD in all namespaces Otherwise, the configured IPv6 address could be still "tentative" at test time, possibly causing tests failures. We can also drop some sleep along the code and decrease the timeout for most commands so that the test runtime decreases. v1 -> v2: - fix comment (Stefano) Fixes: d1f1b9cbf34c ("selftests: net: Introduce first PMTU test") Signed-off-by: Paolo Abeni Reviewed-by: David Ahern Signed-off-by: David S. Miller --- tools/testing/selftests/net/pmtu.sh | 28 +++++++++++++--------------- 1 file changed, 13 insertions(+), 15 deletions(-) diff --git a/tools/testing/selftests/net/pmtu.sh b/tools/testing/selftests/net/pmtu.sh index e2c94e47707c..89aec2fdf4fa 100755 --- a/tools/testing/selftests/net/pmtu.sh +++ b/tools/testing/selftests/net/pmtu.sh @@ -263,8 +263,6 @@ setup_fou_or_gue() { ${ns_a} ip link set ${encap}_a up ${ns_b} ip link set ${encap}_b up - - sleep 1 } setup_fou44() { @@ -302,6 +300,10 @@ setup_gue66() { setup_namespaces() { for n in ${NS_A} ${NS_B} ${NS_R1} ${NS_R2}; do ip netns add ${n} || return 1 + + # Disable DAD, so that we don't have to wait to use the + # configured IPv6 addresses + ip netns exec ${n} sysctl -q net/ipv6/conf/default/accept_dad=0 done } @@ -337,8 +339,6 @@ setup_vti() { ${ns_a} ip link set vti${proto}_a up ${ns_b} ip link set vti${proto}_b up - - sleep 1 } setup_vti4() { @@ -375,8 +375,6 @@ setup_vxlan_or_geneve() { ${ns_a} ip link set ${type}_a up ${ns_b} ip link set ${type}_b up - - sleep 1 } setup_geneve4() { @@ -588,8 +586,8 @@ test_pmtu_ipvX() { mtu "${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 + ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s 1800 ${dst1} > /dev/null + ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -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}" ${dst1})" @@ -621,7 +619,7 @@ test_pmtu_ipvX() { # Decrease remote MTU on path via R2, get new exception mtu "${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 + ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -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 @@ -638,7 +636,7 @@ test_pmtu_ipvX() { 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 + ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -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 } @@ -687,7 +685,7 @@ test_pmtu_ipvX_over_vxlanY_or_geneveY_exception() { 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 + ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${dst} > /dev/null # Check that exception was created pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst})" @@ -767,7 +765,7 @@ test_pmtu_ipvX_over_fouY_or_gueY() { mtu "${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 + ${ns_a} ${ping} -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${dst} > /dev/null # Check that exception was created pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${dst})" @@ -825,13 +823,13 @@ test_pmtu_vti4_exception() { # 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 + ${ns_a} ping -q -M want -i 0.1 -w 1 -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 + ${ns_a} ping -q -M want -i 0.1 -w 1 -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 $((esp_payload_rfc4106 + 1)))" } @@ -847,7 +845,7 @@ test_pmtu_vti6_exception() { mtu "${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 + ${ns_a} ${ping6} -q -i 0.1 -w 1 -s 60000 ${tunnel6_b_addr} > /dev/null # Check that exception was created pmtu="$(route_get_dst_pmtu_from_exception "${ns_a}" ${tunnel6_b_addr})" -- cgit v1.2.3-59-g8ed1b From b3cc4f8a8a411bbf07a7d7213ce9c7571ded38b9 Mon Sep 17 00:00:00 2001 From: Paolo Abeni Date: Mon, 25 Feb 2019 16:08:37 +0100 Subject: selftests: pmtu: add explicit tests for PMTU exceptions cleanup Add a couple of new tests, explicitly checking that the kernel timely releases PMTU exceptions on related device removal. This is mostly a regression test vs the issue fixed by commit f5b51fe804ec ("ipv6: route: purge exception on removal") Only 2 new test cases have been added, instead of extending all the existing ones, because the reproducer requires executing several commands and would slow down too much the tests otherwise. v2 -> v3: - more cleanup, still from Stefano v1 -> v2: - several script cleanups, as suggested by Stefano Signed-off-by: Paolo Abeni Reviewed-by: David Ahern Signed-off-by: David S. Miller --- tools/testing/selftests/net/pmtu.sh | 68 ++++++++++++++++++++++++++++++++++++- 1 file changed, 67 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/net/pmtu.sh b/tools/testing/selftests/net/pmtu.sh index 89aec2fdf4fa..912b2dc50be3 100755 --- a/tools/testing/selftests/net/pmtu.sh +++ b/tools/testing/selftests/net/pmtu.sh @@ -103,6 +103,15 @@ # 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 +# +# - cleanup_ipv4_exception +# Similar to pmtu_ipv4_vxlan4_exception, but explicitly generate PMTU +# exceptions on multiple CPUs and check that the veth device tear-down +# happens in a timely manner +# +# - cleanup_ipv6_exception +# Same as above, but use IPv6 transport from A to B + # Kselftest framework requirement - SKIP code is 4. ksft_skip=4 @@ -135,7 +144,9 @@ tests=" 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" + pmtu_vti6_link_change_mtu vti6: MTU changes on link changes + cleanup_ipv4_exception ipv4: cleanup of cached exceptions + cleanup_ipv6_exception ipv6: cleanup of cached exceptions" NS_A="ns-$(mktemp -u XXXXXX)" NS_B="ns-$(mktemp -u XXXXXX)" @@ -1006,6 +1017,61 @@ test_pmtu_vti6_link_change_mtu() { return ${fail} } +check_command() { + cmd=${1} + + if ! which ${cmd} > /dev/null 2>&1; then + err " missing required command: '${cmd}'" + return 1 + fi + return 0 +} + +test_cleanup_vxlanX_exception() { + outer="${1}" + encap="vxlan" + ll_mtu=4000 + + check_command taskset || return 2 + cpu_list=$(grep -m 2 processor /proc/cpuinfo | cut -d ' ' -f 2) + + setup namespaces routing ${encap}${outer} || 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 "${ns_r1}" veth_R1-B + + # Create route exception by exceeding link layer MTU + mtu "${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)) + + # Fill exception cache for multiple CPUs (2) + # we can always use inner IPv4 for that + for cpu in ${cpu_list}; do + taskset --cpu-list ${cpu} ${ns_a} ping -q -M want -i 0.1 -w 1 -s $((${ll_mtu} + 500)) ${tunnel4_b_addr} > /dev/null + done + + ${ns_a} ip link del dev veth_A-R1 & + iplink_pid=$! + sleep 1 + if [ "$(cat /proc/${iplink_pid}/cmdline 2>/dev/null | tr -d '\0')" = "iplinkdeldevveth_A-R1" ]; then + err " can't delete veth device in a timely manner, PMTU dst likely leaked" + return 1 + fi +} + +test_cleanup_ipv6_exception() { + test_cleanup_vxlanX_exception 6 +} + +test_cleanup_ipv4_exception() { + test_cleanup_vxlanX_exception 4 +} + usage() { echo echo "$0 [OPTIONS] [TEST]..." -- cgit v1.2.3-59-g8ed1b