selftests: net: bridge: add vlan mcast snooping control test

Add the first test for bridge per-vlan multicast snooping which checks
if control of the global and per-vlan options work as expected, joins
and leaves are tested at each option value.

TEST: Vlan multicast snooping enable                                [ OK ]
TEST: Vlan global options existence                                 [ OK ]
TEST: Vlan mcast_snooping global option default value               [ OK ]
TEST: Vlan 10 multicast snooping control                            [ OK ]
Signed-off-by: Nikolay Aleksandrov <nikolay@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

tools/testing/selftests/net/forwarding/bridge_vlan_mcast.sh

+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+
+ALL_TESTS="vlmc_control_test"
+NUM_NETIFS=4
+CHECK_TC="yes"
+TEST_GROUP="239.10.10.10"
+
+source lib.sh
+
+h1_create()
+{
+	simple_if_init $h1 192.0.2.1/24 2001:db8:1::1/64
+	ip link add l $h1 $h1.10 up type vlan id 10
+}
+
+h1_destroy()
+{
+	ip link del $h1.10
+	simple_if_fini $h1 192.0.2.1/24 2001:db8:1::1/64
+}
+
+h2_create()
+{
+	simple_if_init $h2 192.0.2.2/24 2001:db8:1::2/64
+	ip link add l $h2 $h2.10 up type vlan id 10
+}
+
+h2_destroy()
+{
+	ip link del $h2.10
+	simple_if_fini $h2 192.0.2.2/24 2001:db8:1::2/64
+}
+
+switch_create()
+{
+	ip link add dev br0 type bridge mcast_snooping 1 mcast_querier 1 vlan_filtering 1
+
+	ip link set dev $swp1 master br0
+	ip link set dev $swp2 master br0
+
+	ip link set dev br0 up
+	ip link set dev $swp1 up
+	ip link set dev $swp2 up
+
+	bridge vlan add vid 10-11 dev $swp1 master
+	bridge vlan add vid 10-11 dev $swp2 master
+
+	ip link set dev br0 type bridge mcast_vlan_snooping 1
+	check_err $? "Could not enable global vlan multicast snooping"
+	log_test "Vlan multicast snooping enable"
+}
+
+switch_destroy()
+{
+	ip link set dev $swp2 down
+	ip link set dev $swp1 down
+
+	ip link del dev br0
+}
+
+setup_prepare()
+{
+	h1=${NETIFS[p1]}
+	swp1=${NETIFS[p2]}
+
+	swp2=${NETIFS[p3]}
+	h2=${NETIFS[p4]}
+
+	vrf_prepare
+
+	h1_create
+	h2_create
+
+	switch_create
+}
+
+cleanup()
+{
+	pre_cleanup
+
+	switch_destroy
+
+	h2_destroy
+	h1_destroy
+
+	vrf_cleanup
+}
+
+vlmc_v2join_test()
+{
+	local expect=$1
+
+	RET=0
+	ip address add dev $h2.10 $TEST_GROUP/32 autojoin
+	check_err $? "Could not join $TEST_GROUP"
+
+	sleep 5
+	bridge -j mdb show dev br0 |
+		jq -e ".[].mdb[] | select(.grp == \"$TEST_GROUP\" and .vid == 10)" &>/dev/null
+	if [ $expect -eq 0 ]; then
+		check_err $? "IGMPv2 report didn't create mdb entry for $TEST_GROUP"
+	else
+		check_fail $? "IGMPv2 report shouldn't have created mdb entry for $TEST_GROUP"
+	fi
+
+	# check if we need to cleanup
+	if [ $RET -eq 0 ]; then
+		ip address del dev $h2.10 $TEST_GROUP/32 2>&1 1>/dev/null
+		sleep 5
+		bridge -j mdb show dev br0 |
+			jq -e ".[].mdb[] | select(.grp == \"$TEST_GROUP\" and \
+						  .vid == 10)" &>/dev/null
+		check_fail $? "IGMPv2 leave didn't remove mdb entry for $TEST_GROUP"
+	fi
+}
+
+vlmc_control_test()
+{
+	RET=0
+	local goutput=`bridge -j vlan global show`
+	echo -n $goutput |
+		jq -e ".[].vlans[] | select(.vlan == 10)" &>/dev/null
+	check_err $? "Could not find vlan 10's global options"
+	log_test "Vlan global options existence"
+
+	RET=0
+	echo -n $goutput |
+		jq -e ".[].vlans[] | select(.vlan == 10 and .mcast_snooping == 1) " &>/dev/null
+	check_err $? "Wrong default mcast_snooping global option value"
+	log_test "Vlan mcast_snooping global option default value"
+
+	RET=0
+	vlmc_v2join_test 0
+	bridge vlan global set vid 10 dev br0 mcast_snooping 0
+	check_err $? "Could not disable multicast snooping in vlan 10"
+	vlmc_v2join_test 1
+	log_test "Vlan 10 multicast snooping control"
+}
+
+trap cleanup EXIT
+
+setup_prepare
+setup_wait
+
+tests_run
+
+exit $EXIT_STATUS