Interworking: Skip extra scan after network auto-select

If the scan results from before ANQP fetch are fresh (less than five
seconds old), do not run a new scan when selecting the BSS after having
used Interworking network selection.

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

wpa_supplicant/events.c

@@ -1035,8 +1035,6 @@ static int wpa_supplicant_need_to_roam(struct wpa_supplicant *wpa_s,
 static int _wpa_supplicant_event_scan_results(struct wpa_supplicant *wpa_s,
 					      union wpa_event_data *data)
 {
-	struct wpa_bss *selected;
-	struct wpa_ssid *ssid = NULL;
 	struct wpa_scan_results *scan_res;
 	int ap = 0;
 #ifndef CONFIG_NO_RANDOM_POOL
@@ -1150,6 +1148,15 @@ static int _wpa_supplicant_event_scan_results(struct wpa_supplicant *wpa_s,
 
 	wpa_scan_results_free(scan_res);
 
+	return wpas_select_network_from_last_scan(wpa_s);
+}
+
+
+int wpas_select_network_from_last_scan(struct wpa_supplicant *wpa_s)
+{
+	struct wpa_bss *selected;
+	struct wpa_ssid *ssid = NULL;
+
 	selected = wpa_supplicant_pick_network(wpa_s, &ssid);
 
 	if (selected) {

wpa_supplicant/interworking.c

@@ -52,6 +52,18 @@ static void interworking_reconnect(struct wpa_supplicant *wpa_s)
 	}
 	wpa_s->disconnected = 0;
 	wpa_s->reassociate = 1;
+
+	if (wpa_s->last_scan_res_used > 0) {
+		struct os_time now;
+		os_get_time(&now);
+		if (now.sec - wpa_s->last_scan.sec <= 5) {
+			wpa_printf(MSG_DEBUG, "Interworking: Old scan results "
+				   "are fresh - connect without new scan");
+			if (wpas_select_network_from_last_scan(wpa_s) == 0)
+				return;
+		}
+	}
+
 	wpa_supplicant_req_scan(wpa_s, 0, 0);
 }
 

wpa_supplicant/wpa_supplicant_i.h

@@ -717,6 +717,7 @@ int wpa_supplicant_connect(struct wpa_supplicant *wpa_s,
 void wpa_supplicant_stop_countermeasures(void *eloop_ctx, void *sock_ctx);
 void wpa_supplicant_delayed_mic_error_report(void *eloop_ctx, void *sock_ctx);
 void wnm_bss_keep_alive_deinit(struct wpa_supplicant *wpa_s);
+int wpas_select_network_from_last_scan(struct wpa_supplicant *wpa_s);
 
 /* eap_register.c */
 int eap_register_methods(void);