miniupnpd: Added chain rule to filter table so udp stun incoming connections rules works

Signed-off-by: Marco Martins <marcomartins86@gmail.com>

net/miniupnpd/files/firewall.include

@@ -31,13 +31,15 @@ add_extzone_rules() {
     [ -z "$ext_zone" ] && return
 
     # IPv4 - due to NAT, need to add both to nat and filter table
-    # need to insert as penultimate rule for forward & postrouting since final rule might be a fw3 REJECT
+    # need to insert as penultimate rule for input & forward & postrouting since final rule might be a fw3 REJECT
+    iptables_prepend_rule "$IPTABLES" filter "zone_${ext_zone}_input" MINIUPNPD
     iptables_prepend_rule "$IPTABLES" filter "zone_${ext_zone}_forward" MINIUPNPD
     $IPTABLES -t nat -A "zone_${ext_zone}_prerouting"  -j MINIUPNPD
     iptables_prepend_rule "$IPTABLES" nat "zone_${ext_zone}_postrouting" MINIUPNPD-POSTROUTING
 
     # IPv6 if available - filter only
     [ -x $IP6TABLES ] && {
+	iptables_prepend_rule "$IP6TABLES" filter "zone_${ext_zone}_input" MINIUPNPD
 	iptables_prepend_rule "$IP6TABLES" filter "zone_${ext_zone}_forward" MINIUPNPD
     }
     ADDED=$(($ADDED + 1))