gluon-ebtables-filter-multicast: relax IPv6 multicast firewall rules

Allow the transmission of IPv6 multicast packets as long as they are not
flooded through the whole mesh.

Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>

package/gluon-ebtables-filter-multicast/luasrc/lib/gluon/ebtables/355-mcast-drop

+rule ('MULTICAST_OUT -p IPv6 --ip6-dst ff02::1/128 -j DROP')
+rule ('MULTICAST_OUT -p IPv6 --ip6-dst ff00::/8 -j mark --set-mark 0x4 --mark-target RETURN')
 rule ('MULTICAST_OUT -j DROP')

package/gluon-mesh-batman-adv/files/lib/netifd/proto/gluon_bat0.sh

@@ -47,6 +47,7 @@ proto_gluon_bat0_setup() {
 
 	batctl orig_interval 5000
 	batctl hop_penalty "$(lookup_uci 'gluon.mesh_batman_adv.hop_penalty' 15)"
+	batctl noflood_mark 0x4/0x4
 
 	case "$gw_mode" in
 		server)