net: wifi: re-add WIFI_MGMT_FORCED_PASSIVE_SCAN

Re-add the `WIFI_MGMT_FORCED_PASSIVE_SCAN` option removed in #62751.
Now that `struct wifi_scan_params` is a reasonable size, we can enforce
the passive scan request even when no parameter struct is supplied by
the user.

Signed-off-by: Jordan Yates <[email protected]>

Author: Jordan Yates

subsys/net/l2/wifi/Kconfig

@@ -39,6 +39,15 @@ config WIFI_MGMT_TWT_CHECK_IP
 	  even when it is awake intervals. Rejecting TWT setup till Wi-Fi
 	  interface has a valid IP address might be desirable in most scenarios.
 
+config WIFI_MGMT_FORCED_PASSIVE_SCAN
+	bool "Force passive Wi-Fi scanning"
+	help
+	  Always request a passive scan, regardless of the user supplied parameters.
+	  This is typically used when the underlying hardware is not certified for
+	  RF transmissions. This doesn't guarantee that passive scan will be used,
+	  it depends on the underlying chip implementation to support and honour
+	  scan type.
+
 config WIFI_MGMT_SCAN_SSID_FILT_MAX
 	int "Maximum number of SSIDs that can be specified for SSID filtering"
 	default 1

subsys/net/l2/wifi/wifi_mgmt.c

@@ -326,6 +326,15 @@ static int wifi_scan(uint32_t mgmt_request, struct net_if *iface,
 		return -ENOTSUP;
 	}
 
+#ifdef CONFIG_WIFI_MGMT_FORCED_PASSIVE_SCAN
+	struct wifi_scan_params default_params = {0};
+
+	if (params == NULL) {
+		params = &default_params;
+	}
+	params->scan_type = WIFI_SCAN_TYPE_PASSIVE;
+#endif /* CONFIG_WIFI_MGMT_FORCED_PASSIVE_SCAN */
+
 	return wifi_mgmt_api->scan(dev, params, scan_result_cb);
 }