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selftests: bridge_vlan_mcast: Test toggling of multicast snooping

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Test toggling of multicast snooping when per-VLAN multicast snooping is
enabled. The test always passes, but without "bridge: mcast: Fix
possible use-after-free when removing a bridge port" it results in a
splat.

Acked-by: Nikolay Aleksandrov <nikolay@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Link: https://patch.msgid.link/20260517121122.188333-3-idosch@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Ido Schimmel 2026-05-17 15:11:22 +03:00 committed by Jakub Kicinski
parent 4df78ff026
commit ae743a8ca8
1 changed files with 29 additions and 1 deletions
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30
tools/testing/selftests/net/forwarding/bridge_vlan_mcast.sh
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@ -4,7 +4,7 @@
ALL_TESTS="vlmc_control_test vlmc_querier_test vlmc_igmp_mld_version_test \
vlmc_last_member_test vlmc_startup_query_test vlmc_membership_test \
vlmc_querier_intvl_test vlmc_query_intvl_test vlmc_query_response_intvl_test \
vlmc_router_port_test vlmc_filtering_test"
vlmc_router_port_test vlmc_filtering_test vlmc_mcast_toggle_test"
NUM_NETIFS=4
CHECK_TC="yes"
TEST_GROUP="239.10.10.10"
@ -537,6 +537,34 @@ vlmc_filtering_test()
log_test "Disable multicast vlan snooping when vlan filtering is disabled"
}
vlmc_mcast_toggle_test()
{
RET=0
ip link add name br1-mcast up type bridge mcast_snooping 1 mcast_querier 1 vlan_filtering 1
ip link add name dummy1-mcast up master br1-mcast type dummy
# Enabling per-VLAN multicast snooping should disable the per-port
# multicast context on "dummy1-mcast".
ip link set dev br1-mcast type bridge mcast_vlan_snooping 1
# Toggling multicast snooping on the bridge should not affect the
# per-port multicast context on "dummy1-mcast" given that per-VLAN
# multicast snooping is enabled.
ip link set dev br1-mcast type bridge mcast_snooping 0
ip link set dev br1-mcast type bridge mcast_snooping 1
# If both the per-port and per-{port, VLAN} multicast contexts are
# enabled on "dummy1-mcast", removing it from the bridge will result
# in a splat.
ip link set dev dummy1-mcast nomaster
log_test "Toggling mcast snooping with per-VLAN mcast snooping enabled"
ip link del dev dummy1-mcast
ip link del dev br1-mcast
}
trap cleanup EXIT
setup_prepare