[PATCH RFC net-next 13/13] selftests: forwarding: verify flood of known mc on mcast_router port

[Joachim Wiberg <troglobit@gmail.com>]

This test verifies that both known (in mdb) and unknown IP multicast is
forwarded to a mcast_router port.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
---
 .../selftests/net/forwarding/bridge_mdb.sh    | 54 ++++++++++++++++++-
 1 file changed, 53 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/net/forwarding/bridge_mdb.sh b/tools/testing/selftests/net/forwarding/bridge_mdb.sh
index 137bc79fd677..3fd7d68bca09 100755
--- a/tools/testing/selftests/net/forwarding/bridge_mdb.sh
+++ b/tools/testing/selftests/net/forwarding/bridge_mdb.sh
@@ -10,13 +10,16 @@
 # Verify selective multicast forwarding (strict mdb), when bridge port
 # mcast_flood is disabled, of known MAC, IPv4, IPv6 traffic.
 #
+# Verify flooding towards mcast_router ports of known IP multicast.
+#
 # Note: this test completely disables IPv6 auto-configuration to avoid
 #       any type of dynamic behavior outside of MLD and IGMP protocols.
 #       Static IPv6 addresses are used to ensure consistent behavior,
 #       even in the startup phase when multicast snooping is enabled.
 #
 
-ALL_TESTS="mdb_add_del_test mdb_compat_fwd_test mdb_mac_fwd_test mdb_ip4_fwd_test mdb_ip6_fwd_test"
+ALL_TESTS="mdb_add_del_test mdb_compat_fwd_test mdb_rport_fwd_test \
+	   mdb_mac_fwd_test mdb_ip4_fwd_test mdb_ip6_fwd_test"
 NUM_NETIFS=6
 
 SRC_PORT="1234"
@@ -246,6 +249,55 @@ mdb_compat_fwd_test()
 	do_compat_fwd "br0"
 }
 
+#
+# Verify fwd of IP multicast to router ports.  A detected multicast
+# router should always receive both known and unknown multicast.
+#
+mdb_rport_fwd_test()
+{
+	pass_grp=$PASS_GRP_IP4
+	fail_grp=$FAIL_GRP_IP4
+	pass_pkt=$PASS_PKT_IP4
+	fail_pkt=$FAIL_PKT_IP4
+	decoy="br0"
+	port=$h1
+	type="IPv4"
+
+	# Disable flooding of unknown multicast, strict MDB forwarding
+	bridge link set dev "$swp1" mcast_flood off
+	bridge link set dev "$swp2" mcast_flood off
+	bridge link set dev "br0"   mcast_flood off self
+
+	# Let h2 act as a multicast router
+	ip link set dev "$swp1" type bridge_slave mcast_router 2
+
+	# Static filter only to this decoy port
+	bridge mdb add dev br0 port $decoy grp "$pass_grp"
+	check_err $? "Failed adding multicast group $pass_grp to bridge port $decoy"
+
+	tcpdump_start "$port"
+
+	# Real data we're expecting
+	$MZ -q "$h2" "$pass_pkt"
+	# This should not pass
+	$MZ -q "$h2" "$fail_pkt"
+
+	sleep 1
+	tcpdump_stop "$port"
+
+	tcpdump_show "$port" |grep -q "$src$spt > $pass_grp$dpt"
+	check_err $? "Failed forwarding $type multicast $pass_grp from $h2 to port $port"
+
+	tcpdump_show "$port" |grep -q "$src$spt > $fail_grp$dpt"
+	check_err $? "Failed forwarding $type multicast $fail_grp from $h2 to port $port"
+
+	bridge mdb del dev br0 port br0 grp "$pass_grp"
+	ip link set dev "$swp1" type bridge_slave mcast_router 1
+
+	log_test "MDB forward all $type multicast to multicast router on $port"
+	tcpdump_cleanup "$port"
+}
+
 do_mdb_fwd()
 {
 	type=$1
-- 
2.25.1