Document wpa_s->scan_req

Use an enum with documented values to make it easier to understand how
wpa_s->scan_req is used.

Signed-hostap: Jouni Malinen <j@w1.fi>

wpa_supplicant/autoscan.c

@@ -36,7 +36,7 @@ static const struct autoscan_ops * autoscan_modules[] = {
 
 static void request_scan(struct wpa_supplicant *wpa_s)
 {
-	wpa_s->scan_req = 2;
+	wpa_s->scan_req = MANUAL_SCAN_REQ;
 
 	if (wpa_supplicant_req_sched_scan(wpa_s))
 		wpa_supplicant_req_scan(wpa_s, wpa_s->scan_interval, 0);

wpa_supplicant/ctrl_iface.c

@@ -5094,14 +5094,14 @@ char * wpa_supplicant_ctrl_iface_process(struct wpa_supplicant *wpa_s,
 			    ((wpa_s->wpa_state <= WPA_SCANNING) ||
 			     (wpa_s->wpa_state == WPA_COMPLETED))) {
 				wpa_s->normal_scans = 0;
-				wpa_s->scan_req = 2;
+				wpa_s->scan_req = MANUAL_SCAN_REQ;
 				wpa_supplicant_req_scan(wpa_s, 0, 0);
 			} else if (wpa_s->sched_scanning) {
 				wpa_printf(MSG_DEBUG, "Stop ongoing "
 					   "sched_scan to allow requested "
 					   "full scan to proceed");
 				wpa_supplicant_cancel_sched_scan(wpa_s);
-				wpa_s->scan_req = 2;
+				wpa_s->scan_req = MANUAL_SCAN_REQ;
 				wpa_supplicant_req_scan(wpa_s, 0, 0);
 			} else {
 				wpa_printf(MSG_DEBUG, "Ongoing scan action - "

wpa_supplicant/dbus/dbus_new_handlers.c

@@ -1313,7 +1313,7 @@ DBusMessage * wpas_dbus_handler_scan(DBusMessage *message,
 		} else if (params.freqs && params.freqs[0]) {
 			wpa_supplicant_trigger_scan(wpa_s, &params);
 		} else {
-			wpa_s->scan_req = 2;
+			wpa_s->scan_req = MANUAL_SCAN_REQ;
 			wpa_supplicant_req_scan(wpa_s, 0, 0);
 		}
 	} else if (!os_strcmp(type, "active")) {

wpa_supplicant/dbus/dbus_old_handlers.c

@@ -331,7 +331,7 @@ DBusMessage * wpas_dbus_global_set_debugparams(DBusMessage *message,
 DBusMessage * wpas_dbus_iface_scan(DBusMessage *message,
 				   struct wpa_supplicant *wpa_s)
 {
-	wpa_s->scan_req = 2;
+	wpa_s->scan_req = MANUAL_SCAN_REQ;
 	wpa_supplicant_req_scan(wpa_s, 0, 0);
 	return wpas_dbus_new_success_reply(message);
 }

wpa_supplicant/interworking.c

@@ -1964,7 +1964,7 @@ int interworking_select(struct wpa_supplicant *wpa_s, int auto_select)
 	wpa_printf(MSG_DEBUG, "Interworking: Start scan for network "
 		   "selection");
 	wpa_s->scan_res_handler = interworking_scan_res_handler;
-	wpa_s->scan_req = 2;
+	wpa_s->scan_req = MANUAL_SCAN_REQ;
 	wpa_supplicant_req_scan(wpa_s, 0, 0);
 
 	return 0;

wpa_supplicant/scan.c

@@ -505,7 +505,8 @@ static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx)
 {
 	struct wpa_supplicant *wpa_s = eloop_ctx;
 	struct wpa_ssid *ssid;
-	int scan_req = 0, ret;
+	enum scan_req_type scan_req = NORMAL_SCAN_REQ;
+	int ret;
 	struct wpabuf *extra_ie = NULL;
 	struct wpa_driver_scan_params params;
 	struct wpa_driver_scan_params *scan_params;
@@ -517,14 +518,14 @@ static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx)
 		return;
 	}
 
-	if (wpa_s->disconnected && !wpa_s->scan_req) {
+	if (wpa_s->disconnected && wpa_s->scan_req == NORMAL_SCAN_REQ) {
 		wpa_dbg(wpa_s, MSG_DEBUG, "Disconnected - do not scan");
 		wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
 		return;
 	}
 
 	if (!wpa_supplicant_enabled_networks(wpa_s) &&
-	    !wpa_s->scan_req) {
+	    wpa_s->scan_req == NORMAL_SCAN_REQ) {
 		wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks - do not scan");
 		wpa_supplicant_set_state(wpa_s, WPA_INACTIVE);
 #ifdef CONFIG_P2P
@@ -572,7 +573,7 @@ static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx)
 	}
 
 	scan_req = wpa_s->scan_req;
-	wpa_s->scan_req = 0;
+	wpa_s->scan_req = NORMAL_SCAN_REQ;
 
 	os_memset(&params, 0, sizeof(params));
 
@@ -589,7 +590,7 @@ static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx)
 		goto scan;
 	}
 
-	if (scan_req != 2 && wpa_s->connect_without_scan) {
+	if (scan_req != MANUAL_SCAN_REQ && wpa_s->connect_without_scan) {
 		for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
 			if (ssid == wpa_s->connect_without_scan)
 				break;
@@ -627,7 +628,7 @@ static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx)
 		}
 	}
 
-	if (scan_req != 2 && wpa_s->conf->ap_scan == 2) {
+	if (scan_req != MANUAL_SCAN_REQ && wpa_s->conf->ap_scan == 2) {
 		wpa_s->connect_without_scan = NULL;
 		wpa_s->prev_scan_wildcard = 0;
 		wpa_supplicant_assoc_try(wpa_s, ssid);
@@ -762,7 +763,7 @@ scan:
 	 * station interface when we are not configured to prefer station
 	 * connection and a concurrent operation is already in process.
 	 */
-	if (wpa_s->scan_for_connection && !scan_req &&
+	if (wpa_s->scan_for_connection && scan_req == NORMAL_SCAN_REQ &&
 	    !scan_params->freqs && !params.freqs &&
 	    wpas_is_p2p_prioritized(wpa_s) &&
 	    !(wpa_s->drv_flags & WPA_DRIVER_FLAGS_MULTI_CHANNEL_CONCURRENT) &&

wpa_supplicant/wpa_supplicant.c

@@ -1322,7 +1322,7 @@ void wpa_supplicant_associate(struct wpa_supplicant *wpa_s,
 		   (ssid->key_mgmt & WPA_KEY_MGMT_WPS)) {
 		/* Use ap_scan==1 style network selection to find the network
 		 */
-		wpa_s->scan_req = 2;
+		wpa_s->scan_req = MANUAL_SCAN_REQ;
 		wpa_s->reassociate = 1;
 		wpa_supplicant_req_scan(wpa_s, 0, 0);
 		return;
@@ -2413,7 +2413,7 @@ static struct wpa_supplicant * wpa_supplicant_alloc(void)
 	wpa_s = os_zalloc(sizeof(*wpa_s));
 	if (wpa_s == NULL)
 		return NULL;
-	wpa_s->scan_req = 1;
+	wpa_s->scan_req = INITIAL_SCAN_REQ;
 	wpa_s->scan_interval = 5;
 	wpa_s->new_connection = 1;
 	wpa_s->parent = wpa_s;

wpa_supplicant/wpa_supplicant_i.h

@@ -397,8 +397,36 @@ struct wpa_supplicant {
 
 	struct wpa_blacklist *blacklist;
 
-	int scan_req; /* manual scan request; this forces a scan even if there
+	/**
-		       * are no enabled networks in the configuration */
+	 * scan_req - Type of the scan request
+	 */
+	enum scan_req_type {
+		/**
+		 * NORMAL_SCAN_REQ - Normal scan request
+		 *
+		 * This is used for scans initiated by wpa_supplicant to find an
+		 * AP for a connection.
+		 */
+		NORMAL_SCAN_REQ,
+
+		/**
+		 * INITIAL_SCAN_REQ - Initial scan request
+		 *
+		 * This is used for the first scan on an interface to force at
+		 * least one scan to be run even if the configuration does not
+		 * include any enabled networks.
+		 */
+		INITIAL_SCAN_REQ,
+
+		/**
+		 * MANUAL_SCAN_REQ - Manual scan request
+		 *
+		 * This is used for scans where the user request a scan or
+		 * a specific wpa_supplicant operation (e.g., WPS) requires scan
+		 * to be run.
+		 */
+		MANUAL_SCAN_REQ
+	} scan_req;
 	int scan_runs; /* number of scan runs since WPS was started */
 	int *next_scan_freqs;
 	int scan_interval; /* time in sec between scans to find suitable AP */