+
+# By default, user configuration is king.
+
+for ext_iface in $(uci -q get upnpd.config.external_iface); do
+ add_extzone_rules $(fw3 -q network "$ext_iface")
+done
+
+add_extzone_rules $(uci -q get upnpd.config.external_zone)
+
+[ ! $ADDED = 0 ] && exit 0
+
+
+# If really nothing is available, resort to network_find_wan{,6} and
+# assume external interfaces all have same firewall zone.
+
+# (This heuristic may fail horribly, in case of e.g. multihoming, so
+# please set external_zone in that case!)
+
+network_find_wan wan_iface
+network_find_wan6 wan6_iface
+
+for ext_iface in $wan_iface $wan6_iface; do
+ # fw3 -q network fails on sub-interfaces => map to device first
+ network_get_device ext_device $ext_iface
+ add_extzone_rules $(fw3 -q device "$ext_device")
+done