selftest: net: bridge mdb add/del entry to port that is down

Tests that permanent mdb entries can be added/deleted on ports with state down.

Signed-off-by: Casper Andersson <casper.casan@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

tools/testing/selftests/net/forwarding/Makefile

@@ -3,6 +3,7 @@
 TEST_PROGS = bridge_igmp.sh \
 	bridge_locked_port.sh \
 	bridge_mdb.sh \
+	bridge_mdb_port_down.sh \
 	bridge_mld.sh \
 	bridge_port_isolation.sh \
 	bridge_sticky_fdb.sh \

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

@@ -0,0 +1,118 @@
+#!/bin/bash
+# SPDX-License-Identifier: GPL-2.0
+#
+# Verify that permanent mdb entries can be added to and deleted from bridge
+# interfaces that are down, and works correctly when done so.
+
+ALL_TESTS="add_del_to_port_down"
+NUM_NETIFS=4
+
+TEST_GROUP="239.10.10.10"
+TEST_GROUP_MAC="01:00:5e:0a:0a:0a"
+
+source lib.sh
+
+
+add_del_to_port_down() {
+	RET=0
+
+	ip link set dev $swp2 down
+	bridge mdb add dev br0 port "$swp2" grp $TEST_GROUP permanent 2>/dev/null
+	check_err $? "Failed adding mdb entry"
+
+	ip link set dev $swp2 up
+	setup_wait_dev $swp2
+	mcast_packet_test $TEST_GROUP_MAC 192.0.2.1 $TEST_GROUP $h1 $h2
+	check_fail $? "Traffic to $TEST_GROUP wasn't forwarded"
+
+	ip link set dev $swp2 down
+	bridge mdb show dev br0 | grep -q "$TEST_GROUP permanent" 2>/dev/null
+	check_err $? "MDB entry did not persist after link up/down"
+
+	bridge mdb del dev br0 port "$swp2" grp $TEST_GROUP 2>/dev/null
+	check_err $? "Failed deleting mdb entry"
+
+	ip link set dev $swp2 up
+	setup_wait_dev $swp2
+	mcast_packet_test $TEST_GROUP_MAC 192.0.2.1 $TEST_GROUP $h1 $h2
+	check_err $? "Traffic to $TEST_GROUP was forwarded after entry removed"
+
+	log_test "MDB add/del entry to port with state down "
+}
+
+h1_create()
+{
+	simple_if_init $h1 192.0.2.1/24 2001:db8:1::1/64
+}
+
+h1_destroy()
+{
+	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
+}
+
+h2_destroy()
+{
+	simple_if_fini $h2 192.0.2.2/24 2001:db8:1::2/64
+}
+
+switch_create()
+{
+	# Enable multicast filtering
+	ip link add dev br0 type bridge mcast_snooping 1 mcast_querier 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
+
+	bridge link set dev $swp2 mcast_flood off
+	# Bridge currently has a "grace time" at creation time before it
+	# forwards multicast according to the mdb. Since we disable the
+	# mcast_flood setting per port
+	sleep 10
+}
+
+switch_destroy()
+{
+	ip link set dev $swp1 down
+	ip link set dev $swp2 down
+	ip link del dev br0
+}
+
+setup_prepare()
+{
+	h1=${NETIFS[p1]}
+	swp1=${NETIFS[p2]}
+
+	swp2=${NETIFS[p3]}
+	h2=${NETIFS[p4]}
+
+	vrf_prepare
+
+	h1_create
+	h2_create
+	switch_create
+}
+
+cleanup()
+{
+	pre_cleanup
+
+	switch_destroy
+	h1_destroy
+	h2_destroy
+
+	vrf_cleanup
+}
+
+trap cleanup EXIT
+
+setup_prepare
+tests_run
+exit $EXIT_STATUS