This commit adds a new kernel selftest to verify RTNLGRP_IPV4_MCADDR and RTNLGRP_IPV6_MCADDR notifications. The test works by adding and removing a dummy interface and then confirming that the system correctly receives join and removal notifications for the 224.0.0.1 and ff02::1 multicast addresses.
The test relies on the iproute2 version to be 6.13+.
Tested by the following command: $ vng -v --user root --cpus 16 -- \ make -C tools/testing/selftests TARGETS=net TEST_PROGS=rtnetlink.sh \ TEST_GEN_PROGS="" run_tests
Cc: Maciej Żenczykowski maze@google.com Cc: Lorenzo Colitti lorenzo@google.com Signed-off-by: Yuyang Huang yuyanghuang@google.com --- tools/testing/selftests/net/rtnetlink.sh | 34 ++++++++++++++++++++++++ 1 file changed, 34 insertions(+)
diff --git a/tools/testing/selftests/net/rtnetlink.sh b/tools/testing/selftests/net/rtnetlink.sh index 2e8243a65b50..9dbcaaeaf8cd 100755 --- a/tools/testing/selftests/net/rtnetlink.sh +++ b/tools/testing/selftests/net/rtnetlink.sh @@ -21,6 +21,7 @@ ALL_TESTS=" kci_test_vrf kci_test_encap kci_test_macsec + kci_test_mcast_addr_notification kci_test_ipsec kci_test_ipsec_offload kci_test_fdb_get @@ -1334,6 +1335,39 @@ kci_test_mngtmpaddr() return $ret }
+kci_test_mcast_addr_notification() +{ + local tmpfile + local monitor_pid + local match_result + + tmpfile=$(mktemp) + + ip monitor maddr > $tmpfile & + monitor_pid=$! + sleep 1 + + run_cmd ip link add name test-dummy1 type dummy + run_cmd ip link set test-dummy1 up + run_cmd ip link del dev test-dummy1 + sleep 1 + + match_result=$(grep -cE "test-dummy1.*(224.0.0.1|ff02::1)" $tmpfile) + + kill $monitor_pid + rm $tmpfile + # There should be 4 line matches as follows. + # 13: test-dummy1 inet6 mcast ff02::1 scope global + # 13: test-dummy1 inet mcast 224.0.0.1 scope global + # Deleted 13: test-dummy1 inet mcast 224.0.0.1 scope global + # Deleted 13: test-dummy1 inet6 mcast ff02::1 scope global + if [ $match_result -ne 4 ];then + end_test "FAIL: mcast addr notification" + return 1 + fi + end_test "PASS: mcast addr notification" +} + kci_test_rtnl() { local current_test
On Tue, May 27, 2025 at 06:18:55PM +0900, Yuyang Huang wrote:
This commit adds a new kernel selftest to verify RTNLGRP_IPV4_MCADDR and RTNLGRP_IPV6_MCADDR notifications. The test works by adding and removing a dummy interface and then confirming that the system correctly receives join and removal notifications for the 224.0.0.1 and ff02::1 multicast addresses.
The test relies on the iproute2 version to be 6.13+.
Tested by the following command: $ vng -v --user root --cpus 16 -- \ make -C tools/testing/selftests TARGETS=net TEST_PROGS=rtnetlink.sh \ TEST_GEN_PROGS="" run_tests
Cc: Maciej Żenczykowski maze@google.com Cc: Lorenzo Colitti lorenzo@google.com Signed-off-by: Yuyang Huang yuyanghuang@google.com
...
+kci_test_mcast_addr_notification() +{
- local tmpfile
- local monitor_pid
- local match_result
- tmpfile=$(mktemp)
- ip monitor maddr > $tmpfile &
- monitor_pid=$!
Hi Yuyang Huang,
Other tests in this file seem to warn if the ip command is too old to support the test. Perhaps we can achieve that here something like this (completely untested!):
if [ ! -e "/proc/$monitor_pid" ]; then end_test "SKIP: mcast addr notification: iproute2 too old" rm $tmpfile return $ksft_skip fi
- sleep 1
- run_cmd ip link add name test-dummy1 type dummy
- run_cmd ip link set test-dummy1 up
- run_cmd ip link del dev test-dummy1
- sleep 1
- match_result=$(grep -cE "test-dummy1.*(224.0.0.1|ff02::1)" $tmpfile)
- kill $monitor_pid
- rm $tmpfile
- # There should be 4 line matches as follows.
- # 13: test-dummy1 inet6 mcast ff02::1 scope global
- # 13: test-dummy1 inet mcast 224.0.0.1 scope global
- # Deleted 13: test-dummy1 inet mcast 224.0.0.1 scope global
- # Deleted 13: test-dummy1 inet6 mcast ff02::1 scope global
- if [ $match_result -ne 4 ];then
end_test "FAIL: mcast addr notification"return 1- fi
- end_test "PASS: mcast addr notification"
+}
...
## Form letter - net-next-closed
The merge window for v6.16 has begun and therefore net-next is closed for new drivers, features, code refactoring and optimizations. We are currently accepting bug fixes only.
Please repost when net-next reopens after June 8th.
RFC patches sent for review only are obviously welcome at any time.
pw-bot: deffer
Hi Simon
Other tests in this file seem to warn if the ip command is too old to support the test. Perhaps we can achieve that here something like this (completely untested!):
Thanks for the advice. I will modify the test to make sure it skips on old iproute2 versions. I will send the patch after net-next reopens.
Thanks,
Yuyang
On Thu, May 29, 2025 at 12:49 AM Simon Horman horms@kernel.org wrote:
On Tue, May 27, 2025 at 06:18:55PM +0900, Yuyang Huang wrote:
This commit adds a new kernel selftest to verify RTNLGRP_IPV4_MCADDR and RTNLGRP_IPV6_MCADDR notifications. The test works by adding and removing a dummy interface and then confirming that the system correctly receives join and removal notifications for the 224.0.0.1 and ff02::1 multicast addresses.
The test relies on the iproute2 version to be 6.13+.
Tested by the following command: $ vng -v --user root --cpus 16 -- \ make -C tools/testing/selftests TARGETS=net TEST_PROGS=rtnetlink.sh \ TEST_GEN_PROGS="" run_tests
Cc: Maciej Żenczykowski maze@google.com Cc: Lorenzo Colitti lorenzo@google.com Signed-off-by: Yuyang Huang yuyanghuang@google.com
...
+kci_test_mcast_addr_notification() +{
local tmpfilelocal monitor_pidlocal match_resulttmpfile=$(mktemp)ip monitor maddr > $tmpfile &monitor_pid=$!Hi Yuyang Huang,
Other tests in this file seem to warn if the ip command is too old to support the test. Perhaps we can achieve that here something like this (completely untested!):
if [ ! -e "/proc/$monitor_pid" ]; then end_test "SKIP: mcast addr notification: iproute2 too old" rm $tmpfile return $ksft_skip fi
sleep 1run_cmd ip link add name test-dummy1 type dummyrun_cmd ip link set test-dummy1 uprun_cmd ip link del dev test-dummy1sleep 1match_result=$(grep -cE "test-dummy1.*(224.0.0.1|ff02::1)" $tmpfile)kill $monitor_pidrm $tmpfile# There should be 4 line matches as follows.# 13: test-dummy1 inet6 mcast ff02::1 scope global# 13: test-dummy1 inet mcast 224.0.0.1 scope global# Deleted 13: test-dummy1 inet mcast 224.0.0.1 scope global# Deleted 13: test-dummy1 inet6 mcast ff02::1 scope globalif [ $match_result -ne 4 ];thenend_test "FAIL: mcast addr notification"return 1fiend_test "PASS: mcast addr notification"+}
...
## Form letter - net-next-closed
The merge window for v6.16 has begun and therefore net-next is closed for new drivers, features, code refactoring and optimizations. We are currently accepting bug fixes only.
Please repost when net-next reopens after June 8th.
RFC patches sent for review only are obviously welcome at any time.
pw-bot: deffer
linux-kselftest-mirror@lists.linaro.org
-
Simon Horman -
Yuyang Huang