WPS: Fix Beacon WPS IE on concurrent dualband AP in PBC mode

The Beacon frame must include UUID-E and RF Bands attributes when
in active PBC mode to allow stations to figure out that two BSSes in
PBC mode is not a PBC session overlap.

src/ap/wps_hostapd.c

@@ -529,6 +529,23 @@ static const u8 * get_own_uuid(struct hostapd_iface *iface)
 }
 
 
+static int count_interface_cb(struct hostapd_iface *iface, void *ctx)
+{
+	int *count= ctx;
+	(*count)++;
+	return 0;
+}
+
+
+static int interface_count(struct hostapd_iface *iface)
+{
+	int count = 0;
+	iface->for_each_interface(iface->interfaces, count_interface_cb,
+				  &count);
+	return count;
+}
+
+
 int hostapd_init_wps(struct hostapd_data *hapd,
 		     struct hostapd_bss_config *conf)
 {
@@ -688,10 +705,13 @@ int hostapd_init_wps(struct hostapd_data *hapd,
 		conf->skip_cred_build;
 	if (conf->ssid.security_policy == SECURITY_STATIC_WEP)
 		cfg.static_wep_only = 1;
+	cfg.dualband = interface_count(hapd->iface) > 1;
+	if (cfg.dualband)
+		wpa_printf(MSG_DEBUG, "WPS: Dualband AP");
 
 	wps->registrar = wps_registrar_init(wps, &cfg);
 	if (wps->registrar == NULL) {
-		printf("Failed to initialize WPS Registrar\n");
+		wpa_printf(MSG_ERROR, "Failed to initialize WPS Registrar");
 		os_free(wps->network_key);
 		os_free(wps);
 		return -1;

src/wps/wps.h

@@ -352,6 +352,11 @@ struct wps_registrar_config {
 	 * static_wep_only - Whether the BSS supports only static WEP
 	 */
 	int static_wep_only;
+
+	/**
+	 * dualband - Whether this is a concurrent dualband AP
+	 */
+	int dualband;
 };
 
 

src/wps/wps_registrar.c

@@ -126,6 +126,7 @@ struct wps_registrar {
 	int sel_reg_dev_password_id_override;
 	int sel_reg_config_methods_override;
 	int static_wep_only;
+	int dualband;
 
 	struct wps_registrar_device *devices;
 
@@ -430,6 +431,20 @@ static int wps_build_sel_reg_dev_password_id(struct wps_registrar *reg,
 }
 
 
+static int wps_build_sel_pbc_reg_uuid_e(struct wps_registrar *reg,
+					struct wpabuf *msg)
+{
+	u16 id = reg->pbc ? DEV_PW_PUSHBUTTON : DEV_PW_DEFAULT;
+	if (!reg->sel_reg_union)
+		return 0;
+	if (reg->sel_reg_dev_password_id_override >= 0)
+		id = reg->sel_reg_dev_password_id_override;
+	if (id != DEV_PW_PUSHBUTTON || !reg->dualband)
+		return 0;
+	return wps_build_uuid_e(msg, reg->wps->uuid);
+}
+
+
 static void wps_set_pushbutton(u16 *methods, u16 conf_methods)
 {
 	*methods |= WPS_CONFIG_PUSHBUTTON;
@@ -572,6 +587,7 @@ wps_registrar_init(struct wps_context *wps,
 	reg->sel_reg_dev_password_id_override = -1;
 	reg->sel_reg_config_methods_override = -1;
 	reg->static_wep_only = cfg->static_wep_only;
+	reg->dualband = cfg->dualband;
 
 	if (wps_set_ie(reg)) {
 		wps_registrar_deinit(reg);
@@ -1069,6 +1085,8 @@ static int wps_set_ie(struct wps_registrar *reg)
 	    wps_build_selected_registrar(reg, beacon) ||
 	    wps_build_sel_reg_dev_password_id(reg, beacon) ||
 	    wps_build_sel_reg_config_methods(reg, beacon) ||
+	    wps_build_sel_pbc_reg_uuid_e(reg, beacon) ||
+	    (reg->dualband && wps_build_rf_bands(&reg->wps->dev, beacon)) ||
 	    wps_build_wfa_ext(beacon, 0, auth_macs, count)) {
 		wpabuf_free(beacon);
 		wpabuf_free(probe);