hostapd: add external registrar support

Setting wireless.@wifi-iface[N].ext_registrar=1 will enable UPNP
advertising and add an external registrar to the interface this vif
belongs to (br-lan if the vif is included in the LAN bridge). By
enabling this we append upnp_iface=xxx to the hostapd config file.

Signed-off-by: Sujith Manoharan <c_manoha@qca.qualcomm.com>
Signed-off-by: Mathieu Olivari <mathieu@qca.qualcomm.com>
Signed-off-by: Luis R. Rodriguez <mcgrof@qca.qualcomm.com>

SVN-Revision: 38338

package/network/services/hostapd/files/hostapd.sh

@@ -196,6 +196,9 @@ hostapd_set_bss_options() {
 		config_get manufacturer "$vif" wps_manufacturer "openwrt.org"
 		config_get wps_pin "$vif" wps_pin "12345670"
 
+		config_get_bool ext_registrar "$vif" ext_registrar 0
+		[ "$ext_registrar" -gt 0 -a -n "$bridge" ] && append "$var" "upnp_iface=$bridge" "$N"
+
 		append "$var" "eap_server=1" "$N"
 		append "$var" "ap_pin=$wps_pin" "$N"
 		append "$var" "wps_state=${wps_not_configured:-2}" "$N"