text: /*
   * WPA Supplicant - Scanning
   * Copyright (c) 2003-2019, Jouni Malinen <j@w1.fi>
   *
   * This software may be distributed under the terms of the BSD license.
   * See README for more details.
   */
  
  #include "utils/includes.h"
  
  #include "utils/common.h"
  #include "utils/eloop.h"
  #include "common/ieee802_11_defs.h"
  #include "common/wpa_ctrl.h"
  #include "config.h"
  #include "wpa_supplicant_i.h"
  #include "driver_i.h"
  #include "wps_supplicant.h"
  #include "p2p_supplicant.h"
  #include "p2p/p2p.h"
  #include "hs20_supplicant.h"
  #include "notify.h"
  #include "bss.h"
  #include "scan.h"
  #include "mesh.h"
  
  
  static void wpa_supplicant_gen_assoc_event(struct wpa_supplicant *wpa_s)
  {
  	struct wpa_ssid *ssid;
  	union wpa_event_data data;
  
  	ssid = wpa_supplicant_get_ssid(wpa_s);
  	if (ssid == NULL)
  		return;
  
  	if (wpa_s->current_ssid == NULL) {
  		wpa_s->current_ssid = ssid;
  		wpas_notify_network_changed(wpa_s);
  	}
  	wpa_supplicant_initiate_eapol(wpa_s);
  	wpa_dbg(wpa_s, MSG_DEBUG, "Already associated with a configured "
  		"network - generating associated event");
  	os_memset(&data, 0, sizeof(data));
  	wpa_supplicant_event(wpa_s, EVENT_ASSOC, &data);
  }
  
  
  #ifdef CONFIG_WPS
  static int wpas_wps_in_use(struct wpa_supplicant *wpa_s,
  			   enum wps_request_type *req_type)
  {
  	struct wpa_ssid *ssid;
  	int wps = 0;
  
  	for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
  		if (!(ssid->key_mgmt & WPA_KEY_MGMT_WPS))
  			continue;
  
  		wps = 1;
  		*req_type = wpas_wps_get_req_type(ssid);
  		if (ssid->eap.phase1 && os_strstr(ssid->eap.phase1, "pbc=1"))
  			return 2;
  	}
  
  #ifdef CONFIG_P2P
  	if (!wpa_s->global->p2p_disabled && wpa_s->global->p2p &&
  	    !wpa_s->conf->p2p_disabled) {
  		wpa_s->wps->dev.p2p = 1;
  		if (!wps) {
  			wps = 1;
  			*req_type = WPS_REQ_ENROLLEE_INFO;
  		}
  	}
  #endif /* CONFIG_P2P */
  
  	return wps;
  }
  #endif /* CONFIG_WPS */
  
  
  static int wpa_setup_mac_addr_rand_params(struct wpa_driver_scan_params *params,
  					  const u8 *mac_addr)
  {
  	u8 *tmp;
  
  	if (params->mac_addr) {
  		params->mac_addr_mask = NULL;
  		os_free(params->mac_addr);
  		params->mac_addr = NULL;
  	}
  
  	params->mac_addr_rand = 1;
  
  	if (!mac_addr)
  		return 0;
  
  	tmp = os_malloc(2 * ETH_ALEN);
  	if (!tmp)
  		return -1;
  
  	os_memcpy(tmp, mac_addr, 2 * ETH_ALEN);
  	params->mac_addr = tmp;
  	params->mac_addr_mask = tmp + ETH_ALEN;
  	return 0;
  }
  
  
  /**
   * wpa_supplicant_enabled_networks - Check whether there are enabled networks
   * @wpa_s: Pointer to wpa_supplicant data
   * Returns: 0 if no networks are enabled, >0 if networks are enabled
   *
   * This function is used to figure out whether any networks (or Interworking
   * with enabled credentials and auto_interworking) are present in the current
   * configuration.
   */
  int wpa_supplicant_enabled_networks(struct wpa_supplicant *wpa_s)
  {
  	struct wpa_ssid *ssid = wpa_s->conf->ssid;
  	int count = 0, disabled = 0;
  
  	if (wpa_s->p2p_mgmt)
  		return 0; /* no normal network profiles on p2p_mgmt interface */
  
  	while (ssid) {
  		if (!wpas_network_disabled(wpa_s, ssid))
  			count++;
  		else
  			disabled++;
  		ssid = ssid->next;
  	}
  	if (wpa_s->conf->cred && wpa_s->conf->interworking &&
  	    wpa_s->conf->auto_interworking)
  		count++;
  	if (count == 0 && disabled > 0) {
  		wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks (%d disabled "
  			"networks)", disabled);
  	}
  	return count;
  }
  
  
  static void wpa_supplicant_assoc_try(struct wpa_supplicant *wpa_s,
  				     struct wpa_ssid *ssid)
  {
  	int min_temp_disabled = 0;
  
  	while (ssid) {
  		if (!wpas_network_disabled(wpa_s, ssid)) {
  			int temp_disabled = wpas_temp_disabled(wpa_s, ssid);
  
  			if (temp_disabled <= 0)
  				break;
  
  			if (!min_temp_disabled ||
  			    temp_disabled < min_temp_disabled)
  				min_temp_disabled = temp_disabled;
  		}
  		ssid = ssid->next;
  	}
  
  	/* ap_scan=2 mode - try to associate with each SSID. */
  	if (ssid == NULL) {
  		wpa_dbg(wpa_s, MSG_DEBUG, "wpa_supplicant_assoc_try: Reached "
  			"end of scan list - go back to beginning");
  		wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
  		wpa_supplicant_req_scan(wpa_s, min_temp_disabled, 0);
  		return;
  	}
  	if (ssid->next) {
  		/* Continue from the next SSID on the next attempt. */
  		wpa_s->prev_scan_ssid = ssid;
  	} else {
  		/* Start from the beginning of the SSID list. */
  		wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
  	}
  	wpa_supplicant_associate(wpa_s, NULL, ssid);
  }
  
  
  static void wpas_trigger_scan_cb(struct wpa_radio_work *work, int deinit)
  {
  	struct wpa_supplicant *wpa_s = work->wpa_s;
  	struct wpa_driver_scan_params *params = work->ctx;
  	int ret;
  
  	if (deinit) {
  		if (!work->started) {
  			wpa_scan_free_params(params);
  			return;
  		}
  		wpa_supplicant_notify_scanning(wpa_s, 0);
  		wpas_notify_scan_done(wpa_s, 0);
                  wpa_dbg(wpa_s, MSG_DEBUG, "trigger-scan-cb, deinit, work: %p",
                          wpa_s->scan_work);
  		wpa_s->scan_work = NULL;
  		return;
  	}
  
  	if ((wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_SCAN) &&
  	    wpa_s->wpa_state <= WPA_SCANNING)
  		wpa_setup_mac_addr_rand_params(params, wpa_s->mac_addr_scan);
  
  	if (wpas_update_random_addr_disassoc(wpa_s) < 0) {
  		wpa_msg(wpa_s, MSG_INFO,
  			"Failed to assign random MAC address for a scan");
  		wpa_scan_free_params(params);
  		wpa_msg(wpa_s, MSG_INFO, WPA_EVENT_SCAN_FAILED "ret=-1");
  		radio_work_done(work);
  		return;
  	}
  
  	wpa_supplicant_notify_scanning(wpa_s, 1);
  
  	if (wpa_s->clear_driver_scan_cache) {
  		wpa_printf(MSG_DEBUG,
  			   "Request driver to clear scan cache due to local BSS flush");
  		params->only_new_results = 1;
  	}
  	ret = wpa_drv_scan(wpa_s, params);
  	/*
  	 * Store the obtained vendor scan cookie (if any) in wpa_s context.
  	 * The current design is to allow only one scan request on each
  	 * interface, hence having this scan cookie stored in wpa_s context is
  	 * fine for now.
  	 *
  	 * Revisit this logic if concurrent scan operations per interface
  	 * is supported.
  	 */
  	if (ret == 0)
  		wpa_s->curr_scan_cookie = params->scan_cookie;
  	wpa_scan_free_params(params);
  	work->ctx = NULL;
  	if (ret) {
  		int retry = wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
  			!wpa_s->beacon_rep_data.token;
  
  		if (wpa_s->disconnected)
  			retry = 0;
  
  		/* do not retry if operation is not supported */
  		if (ret == -EOPNOTSUPP)
  			retry = 0;
  
  		wpa_supplicant_notify_scanning(wpa_s, 0);
  		wpas_notify_scan_done(wpa_s, 0);
  		if (wpa_s->wpa_state == WPA_SCANNING)
  			wpa_supplicant_set_state(wpa_s,
  						 wpa_s->scan_prev_wpa_state);
  		wpa_msg(wpa_s, MSG_INFO, WPA_EVENT_SCAN_FAILED "ret=%d%s",
  			ret, retry ? " retry=1" : "");
  		radio_work_done(work);
  
  		if (retry) {
  			/* Restore scan_req since we will try to scan again */
  			wpa_s->scan_req = wpa_s->last_scan_req;
  			wpa_supplicant_req_scan(wpa_s, 1, 0);
  		} else if (wpa_s->scan_res_handler) {
  			/* Clear the scan_res_handler */
  			wpa_s->scan_res_handler = NULL;
  		}
  
  		if (wpa_s->beacon_rep_data.token)
  			wpas_rrm_refuse_request(wpa_s);
  
  		return;
  	}
  
  	os_get_reltime(&wpa_s->scan_trigger_time);
  	wpa_s->scan_runs++;
  	wpa_s->normal_scans++;
  	wpa_s->own_scan_requested = 1;
  	wpa_s->clear_driver_scan_cache = 0;
  	wpa_s->scan_work = work;
          wpa_dbg(wpa_s, MSG_DEBUG, "trigger-scan-cb, assign work: %p",
                  wpa_s->scan_work);
  }
  
  
  /**
   * wpa_supplicant_trigger_scan - Request driver to start a scan
   * @wpa_s: Pointer to wpa_supplicant data
   * @params: Scan parameters
   * Returns: 0 on success, -1 on failure
   */
  int wpa_supplicant_trigger_scan(struct wpa_supplicant *wpa_s,
  				struct wpa_driver_scan_params *params)
  {
  	struct wpa_driver_scan_params *ctx;
  
  	if (wpa_s->scan_work) {
  		wpa_dbg(wpa_s, MSG_INFO, "Reject scan trigger since one is already pending");
  		return -1;
  	}
  
          wpa_dbg(wpa_s, MSG_DEBUG, "trigger-scan, freqs: %p",
                  params->freqs);
  	ctx = wpa_scan_clone_params(params);
  	if (!ctx ||
  	    radio_add_work(wpa_s, 0, "scan", 0, wpas_trigger_scan_cb, ctx) < 0)
  	{
  		wpa_scan_free_params(ctx);
  		wpa_msg(wpa_s, MSG_INFO, WPA_EVENT_SCAN_FAILED "ret=-1");
  		return -1;
  	}
  
  	return 0;
  }
  
  void wpa_remove_scan_work(struct wpa_supplicant *wpa_s, const char* dbg, int own_request)
  {
  	if (own_request && wpa_s->scan_work) {
  		struct wpa_radio_work *work = wpa_s->scan_work;
                  wpa_dbg(wpa_s, MSG_DEBUG, "Remove scan work, work: %p dbg: %s",
                          work, dbg);
  		wpa_s->scan_work = NULL;
  		radio_work_done(work);
  	}
  }
  
  static void
  wpa_supplicant_delayed_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
  {
  	struct wpa_supplicant *wpa_s = eloop_ctx;
  
  	wpa_dbg(wpa_s, MSG_DEBUG, "Starting delayed sched scan");
  
  	if (wpa_supplicant_req_sched_scan(wpa_s))
  		wpa_supplicant_req_scan(wpa_s, 0, 0);
  }
  
  
  static void
  wpa_supplicant_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
  {
  	struct wpa_supplicant *wpa_s = eloop_ctx;
  
  	wpa_dbg(wpa_s, MSG_DEBUG, "Sched scan timeout - stopping it");
  
  	wpa_s->sched_scan_timed_out = 1;
  	wpa_supplicant_cancel_sched_scan(wpa_s);
  }
  
  
  static int
  wpa_supplicant_start_sched_scan(struct wpa_supplicant *wpa_s,
  				struct wpa_driver_scan_params *params)
  {
  	int ret;
  
  	wpa_supplicant_notify_scanning(wpa_s, 1);
  	ret = wpa_drv_sched_scan(wpa_s, params);
  	if (ret)
  		wpa_supplicant_notify_scanning(wpa_s, 0);
  	else
  		wpa_s->sched_scanning = 1;
  
  	return ret;
  }
  
  
  static int wpa_supplicant_stop_sched_scan(struct wpa_supplicant *wpa_s)
  {
  	int ret;
  
  	ret = wpa_drv_stop_sched_scan(wpa_s);
  	if (ret) {
  		wpa_dbg(wpa_s, MSG_DEBUG, "stopping sched_scan failed!");
  		/* TODO: what to do if stopping fails? */
  		return -1;
  	}
  
  	return ret;
  }
  
  
  static struct wpa_driver_scan_filter *
  wpa_supplicant_build_filter_ssids(struct wpa_config *conf, size_t *num_ssids)
  {
  	struct wpa_driver_scan_filter *ssids;
  	struct wpa_ssid *ssid;
  	size_t count;
  
  	*num_ssids = 0;
  	if (!conf->filter_ssids)
  		return NULL;
  
  	for (count = 0, ssid = conf->ssid; ssid; ssid = ssid->next) {
  		if (ssid->ssid && ssid->ssid_len)
  			count++;
  	}
  	if (count == 0)
  		return NULL;
  	ssids = os_calloc(count, sizeof(struct wpa_driver_scan_filter));
  	if (ssids == NULL)
  		return NULL;
  
  	for (ssid = conf->ssid; ssid; ssid = ssid->next) {
  		if (!ssid->ssid || !ssid->ssid_len)
  			continue;
  		os_memcpy(ssids[*num_ssids].ssid, ssid->ssid, ssid->ssid_len);
  		ssids[*num_ssids].ssid_len = ssid->ssid_len;
  		(*num_ssids)++;
  	}
  
  	return ssids;
  }
  
  
  static void wpa_supplicant_optimize_freqs(
  	struct wpa_supplicant *wpa_s, struct wpa_driver_scan_params *params)
  {
  #ifdef CONFIG_P2P
  	if (params->freqs == NULL && wpa_s->p2p_in_provisioning &&
  	    wpa_s->go_params) {
  		/* Optimize provisioning state scan based on GO information */
  		if (wpa_s->p2p_in_provisioning < 5 &&
  		    wpa_s->go_params->freq > 0) {
  			wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO "
  				"preferred frequency %d MHz",
  				wpa_s->go_params->freq);
  			params->freqs = os_calloc(2, sizeof(int));
  			if (params->freqs)
  				params->freqs[0] = wpa_s->go_params->freq;
  		} else if (wpa_s->p2p_in_provisioning < 8 &&
  			   wpa_s->go_params->freq_list[0]) {
  			wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only common "
  				"channels");
  			int_array_concat(&params->freqs,
  					 wpa_s->go_params->freq_list);
  			if (params->freqs)
  				int_array_sort_unique(params->freqs);
  		}
  		wpa_s->p2p_in_provisioning++;
  	}
  
  	if (params->freqs == NULL && wpa_s->p2p_in_invitation) {
  		/*
  		 * Optimize scan based on GO information during persistent
  		 * group reinvocation
  		 */
  		if (wpa_s->p2p_in_invitation < 5 &&
  		    wpa_s->p2p_invite_go_freq > 0) {
  			wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO preferred frequency %d MHz during invitation",
  				wpa_s->p2p_invite_go_freq);
  			params->freqs = os_calloc(2, sizeof(int));
  			if (params->freqs)
  				params->freqs[0] = wpa_s->p2p_invite_go_freq;
  		}
  		wpa_s->p2p_in_invitation++;
  		if (wpa_s->p2p_in_invitation > 20) {
  			/*
  			 * This should not really happen since the variable is
  			 * cleared on group removal, but if it does happen, make
  			 * sure we do not get stuck in special invitation scan
  			 * mode.
  			 */
  			wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Clear p2p_in_invitation");
  			wpa_s->p2p_in_invitation = 0;
  		}
  	}
  #endif /* CONFIG_P2P */
  
  #ifdef CONFIG_WPS
  	if (params->freqs == NULL && wpa_s->after_wps && wpa_s->wps_freq) {
  		/*
  		 * Optimize post-provisioning scan based on channel used
  		 * during provisioning.
  		 */
  		wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz "
  			"that was used during provisioning", wpa_s->wps_freq);
  		params->freqs = os_calloc(2, sizeof(int));
  		if (params->freqs)
  			params->freqs[0] = wpa_s->wps_freq;
  		wpa_s->after_wps--;
  	} else if (wpa_s->after_wps)
  		wpa_s->after_wps--;
  
  	if (params->freqs == NULL && wpa_s->known_wps_freq && wpa_s->wps_freq)
  	{
  		/* Optimize provisioning scan based on already known channel */
  		wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz",
  			wpa_s->wps_freq);
  		params->freqs = os_calloc(2, sizeof(int));
  		if (params->freqs)
  			params->freqs[0] = wpa_s->wps_freq;
  		wpa_s->known_wps_freq = 0; /* only do this once */
  	}
  #endif /* CONFIG_WPS */
  }
  
  
  #ifdef CONFIG_INTERWORKING
  static void wpas_add_interworking_elements(struct wpa_supplicant *wpa_s,
  					   struct wpabuf *buf)
  {
  	wpabuf_put_u8(buf, WLAN_EID_INTERWORKING);
  	wpabuf_put_u8(buf, is_zero_ether_addr(wpa_s->conf->hessid) ? 1 :
  		      1 + ETH_ALEN);
  	wpabuf_put_u8(buf, wpa_s->conf->access_network_type);
  	/* No Venue Info */
  	if (!is_zero_ether_addr(wpa_s->conf->hessid))
  		wpabuf_put_data(buf, wpa_s->conf->hessid, ETH_ALEN);
  }
  #endif /* CONFIG_INTERWORKING */
  
  
  #ifdef CONFIG_MBO
  static void wpas_fils_req_param_add_max_channel(struct wpa_supplicant *wpa_s,
  						struct wpabuf **ie)
  {
  	if (wpabuf_resize(ie, 5)) {
  		wpa_printf(MSG_DEBUG,
  			   "Failed to allocate space for FILS Request Parameters element");
  		return;
  	}
  
  	/* FILS Request Parameters element */
  	wpabuf_put_u8(*ie, WLAN_EID_EXTENSION);
  	wpabuf_put_u8(*ie, 3); /* FILS Request attribute length */
  	wpabuf_put_u8(*ie, WLAN_EID_EXT_FILS_REQ_PARAMS);
  	/* Parameter control bitmap */
  	wpabuf_put_u8(*ie, 0);
  	/* Max Channel Time field - contains the value of MaxChannelTime
  	 * parameter of the MLME-SCAN.request primitive represented in units of
  	 * TUs, as an unsigned integer. A Max Channel Time field value of 255
  	 * is used to indicate any duration of more than 254 TUs, or an
  	 * unspecified or unknown duration. (IEEE Std 802.11ai-2016, 9.4.2.178)
  	 */
  	wpabuf_put_u8(*ie, 255);
  }
  #endif /* CONFIG_MBO */
  
  
  void wpa_supplicant_set_default_scan_ies(struct wpa_supplicant *wpa_s)
  {
  	struct wpabuf *default_ies = NULL;
  	u8 ext_capab[18];
  	int ext_capab_len, frame_id;
  	enum wpa_driver_if_type type = WPA_IF_STATION;
  
  #ifdef CONFIG_P2P
  	if (wpa_s->p2p_group_interface == P2P_GROUP_INTERFACE_CLIENT)
  		type = WPA_IF_P2P_CLIENT;
  #endif /* CONFIG_P2P */
  
  	wpa_drv_get_ext_capa(wpa_s, type);
  
  	ext_capab_len = wpas_build_ext_capab(wpa_s, ext_capab,
  					     sizeof(ext_capab));
  	if (ext_capab_len > 0 &&
  	    wpabuf_resize(&default_ies, ext_capab_len) == 0)
  		wpabuf_put_data(default_ies, ext_capab, ext_capab_len);
  
  #ifdef CONFIG_MBO
  	if (wpa_s->enable_oce & OCE_STA)
  		wpas_fils_req_param_add_max_channel(wpa_s, &default_ies);
  	/* Send MBO and OCE capabilities */
  	if (wpabuf_resize(&default_ies, 12) == 0)
  		wpas_mbo_scan_ie(wpa_s, default_ies);
  #endif /* CONFIG_MBO */
  
  	if (type == WPA_IF_P2P_CLIENT)
  		frame_id = VENDOR_ELEM_PROBE_REQ_P2P;
  	else
  		frame_id = VENDOR_ELEM_PROBE_REQ;
  
  	if (wpa_s->vendor_elem[frame_id]) {
  		size_t len;
  
  		len = wpabuf_len(wpa_s->vendor_elem[frame_id]);
  		if (len > 0 && wpabuf_resize(&default_ies, len) == 0)
  			wpabuf_put_buf(default_ies,
  				       wpa_s->vendor_elem[frame_id]);
  	}
  
  	if (default_ies)
  		wpa_drv_set_default_scan_ies(wpa_s, wpabuf_head(default_ies),
  					     wpabuf_len(default_ies));
  	wpabuf_free(default_ies);
  }
  
  
  static struct wpabuf * wpa_supplicant_extra_ies(struct wpa_supplicant *wpa_s)
  {
  	struct wpabuf *extra_ie = NULL;
  	u8 ext_capab[18];
  	int ext_capab_len;
  #ifdef CONFIG_WPS
  	int wps = 0;
  	enum wps_request_type req_type = WPS_REQ_ENROLLEE_INFO;
  #endif /* CONFIG_WPS */
  
  #ifdef CONFIG_P2P
  	if (wpa_s->p2p_group_interface == P2P_GROUP_INTERFACE_CLIENT)
  		wpa_drv_get_ext_capa(wpa_s, WPA_IF_P2P_CLIENT);
  	else
  #endif /* CONFIG_P2P */
  		wpa_drv_get_ext_capa(wpa_s, WPA_IF_STATION);
  
  	ext_capab_len = wpas_build_ext_capab(wpa_s, ext_capab,
  					     sizeof(ext_capab));
  	if (ext_capab_len > 0 &&
  	    wpabuf_resize(&extra_ie, ext_capab_len) == 0)
  		wpabuf_put_data(extra_ie, ext_capab, ext_capab_len);
  
  #ifdef CONFIG_INTERWORKING
  	if (wpa_s->conf->interworking &&
  	    wpabuf_resize(&extra_ie, 100) == 0)
  		wpas_add_interworking_elements(wpa_s, extra_ie);
  #endif /* CONFIG_INTERWORKING */
  
  #ifdef CONFIG_MBO
  	if (wpa_s->enable_oce & OCE_STA)
  		wpas_fils_req_param_add_max_channel(wpa_s, &extra_ie);
  #endif /* CONFIG_MBO */
  
  #ifdef CONFIG_WPS
  	wps = wpas_wps_in_use(wpa_s, &req_type);
  
  	if (wps) {
  		struct wpabuf *wps_ie;
  		wps_ie = wps_build_probe_req_ie(wps == 2 ? DEV_PW_PUSHBUTTON :
  						DEV_PW_DEFAULT,
  						&wpa_s->wps->dev,
  						wpa_s->wps->uuid, req_type,
  						0, NULL);
  		if (wps_ie) {
  			if (wpabuf_resize(&extra_ie, wpabuf_len(wps_ie)) == 0)
  				wpabuf_put_buf(extra_ie, wps_ie);
  			wpabuf_free(wps_ie);
  		}
  	}
  
  #ifdef CONFIG_P2P
  	if (wps) {
  		size_t ielen = p2p_scan_ie_buf_len(wpa_s->global->p2p);
  		if (wpabuf_resize(&extra_ie, ielen) == 0)
  			wpas_p2p_scan_ie(wpa_s, extra_ie);
  	}
  #endif /* CONFIG_P2P */
  
  	wpa_supplicant_mesh_add_scan_ie(wpa_s, &extra_ie);
  
  #endif /* CONFIG_WPS */
  
  #ifdef CONFIG_HS20
  	if (wpa_s->conf->hs20 && wpabuf_resize(&extra_ie, 9) == 0)
  		wpas_hs20_add_indication(extra_ie, -1, 0);
  #endif /* CONFIG_HS20 */
  
  #ifdef CONFIG_FST
  	if (wpa_s->fst_ies &&
  	    wpabuf_resize(&extra_ie, wpabuf_len(wpa_s->fst_ies)) == 0)
  		wpabuf_put_buf(extra_ie, wpa_s->fst_ies);
  #endif /* CONFIG_FST */
  
  #ifdef CONFIG_MBO
  	/* Send MBO and OCE capabilities */
  	if (wpabuf_resize(&extra_ie, 12) == 0)
  		wpas_mbo_scan_ie(wpa_s, extra_ie);
  #endif /* CONFIG_MBO */
  
  	if (wpa_s->vendor_elem[VENDOR_ELEM_PROBE_REQ]) {
  		struct wpabuf *buf = wpa_s->vendor_elem[VENDOR_ELEM_PROBE_REQ];
  
  		if (wpabuf_resize(&extra_ie, wpabuf_len(buf)) == 0)
  			wpabuf_put_buf(extra_ie, buf);
  	}
  
  	/* Add user-specified IE.  Duplicates what is above, it seems. --Ben */
  	if (wpa_s->conf->probe_req_ie) {
  		int ln = wpabuf_len(wpa_s->conf->probe_req_ie);
  		if (wpabuf_resize(&extra_ie, ln) == 0) {
  			wpabuf_put_buf(extra_ie, wpa_s->conf->probe_req_ie);
  		}
  	}
  
  	return extra_ie;
  }
  
  
  #ifdef CONFIG_P2P
  
  /*
   * Check whether there are any enabled networks or credentials that could be
   * used for a non-P2P connection.
   */
  static int non_p2p_network_enabled(struct wpa_supplicant *wpa_s)
  {
  	struct wpa_ssid *ssid;
  
  	for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
  		if (wpas_network_disabled(wpa_s, ssid))
  			continue;
  		if (!ssid->p2p_group)
  			return 1;
  	}
  
  	if (wpa_s->conf->cred && wpa_s->conf->interworking &&
  	    wpa_s->conf->auto_interworking)
  		return 1;
  
  	return 0;
  }
  
  #endif /* CONFIG_P2P */
  
  
  int wpa_add_scan_freqs_list(struct wpa_supplicant *wpa_s,
  			    enum hostapd_hw_mode band,
  			    struct wpa_driver_scan_params *params, bool is_6ghz)
  {
  	/* Include only supported channels for the specified band */
  	struct hostapd_hw_modes *mode;
  	int num_chans = 0;
  	int *freqs, i;
  
  	mode = get_mode(wpa_s->hw.modes, wpa_s->hw.num_modes, band, is_6ghz);
  	if (!mode)
  		return -1;
  
  	if (params->freqs) {
  		while (params->freqs[num_chans])
  			num_chans++;
  	}
  
  	freqs = os_realloc(params->freqs,
  			   (num_chans + mode->num_channels + 1) * sizeof(int));
  	if (!freqs)
  		return -1;
  
  	params->freqs = freqs;
  	for (i = 0; i < mode->num_channels; i++) {
  		if (mode->channels[i].flag & HOSTAPD_CHAN_DISABLED)
  			continue;
  		params->freqs[num_chans++] = mode->channels[i].freq;
  	}
  	params->freqs[num_chans] = 0;
  
  	return 0;
  }
  
  
  static void wpa_setband_scan_freqs(struct wpa_supplicant *wpa_s,
  				   struct wpa_driver_scan_params *params)
  {
  	if (wpa_s->hw.modes == NULL)
  		return; /* unknown what channels the driver supports */
  	if (params->freqs)
  		return; /* already using a limited channel set */
  
  	if (wpa_s->setband_mask & WPA_SETBAND_5G)
  		wpa_add_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211A, params,
  					0);
  	if (wpa_s->setband_mask & WPA_SETBAND_2G)
  		wpa_add_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211G, params,
  					0);
  	if (wpa_s->setband_mask & WPA_SETBAND_6G)
  		wpa_add_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211A, params,
  					1);
  }
  
  
  static void wpa_add_scan_ssid(struct wpa_supplicant *wpa_s,
  			      struct wpa_driver_scan_params *params,
  			      size_t max_ssids, const u8 *ssid, size_t ssid_len)
  {
  	unsigned int j;
  
  	for (j = 0; j < params->num_ssids; j++) {
  		if (params->ssids[j].ssid_len == ssid_len &&
  		    params->ssids[j].ssid &&
  		    os_memcmp(params->ssids[j].ssid, ssid, ssid_len) == 0)
  			return; /* already in the list */
  	}
  
  	if (params->num_ssids + 1 > max_ssids) {
  		wpa_printf(MSG_DEBUG, "Over max scan SSIDs for manual request");
  		return;
  	}
  
  	wpa_printf(MSG_DEBUG, "Scan SSID (manual request): %s",
  		   wpa_ssid_txt(ssid, ssid_len));
  
  	params->ssids[params->num_ssids].ssid = ssid;
  	params->ssids[params->num_ssids].ssid_len = ssid_len;
  	params->num_ssids++;
  }
  
  
  static void wpa_add_owe_scan_ssid(struct wpa_supplicant *wpa_s,
  				  struct wpa_driver_scan_params *params,
  				  struct wpa_ssid *ssid, size_t max_ssids)
  {
  #ifdef CONFIG_OWE
  	struct wpa_bss *bss;
  
  	if (!(ssid->key_mgmt & WPA_KEY_MGMT_OWE))
  		return;
  
  	wpa_printf(MSG_DEBUG, "OWE: Look for transition mode AP. ssid=%s",
  		   wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
  
  	dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
  		const u8 *owe, *pos, *end;
  		const u8 *owe_ssid;
  		size_t owe_ssid_len;
  
  		if (bss->ssid_len != ssid->ssid_len ||
  		    os_memcmp(bss->ssid, ssid->ssid, ssid->ssid_len) != 0)
  			continue;
  
  		owe = wpa_bss_get_vendor_ie(bss, OWE_IE_VENDOR_TYPE);
  		if (!owe || owe[1] < 4)
  			continue;
  
  		pos = owe + 6;
  		end = owe + 2 + owe[1];
  
  		/* Must include BSSID and ssid_len */
  		if (end - pos < ETH_ALEN + 1)
  			return;
  
  		/* Skip BSSID */
  		pos += ETH_ALEN;
  		owe_ssid_len = *pos++;
  		owe_ssid = pos;
  
  		if ((size_t) (end - pos) < owe_ssid_len ||
  		    owe_ssid_len > SSID_MAX_LEN)
  			return;
  
  		wpa_printf(MSG_DEBUG,
  			   "OWE: scan_ssids: transition mode OWE ssid=%s",
  			   wpa_ssid_txt(owe_ssid, owe_ssid_len));
  
  		wpa_add_scan_ssid(wpa_s, params, max_ssids,
  				  owe_ssid, owe_ssid_len);
  		return;
  	}
  #endif /* CONFIG_OWE */
  }
  
  
  static void wpa_set_scan_ssids(struct wpa_supplicant *wpa_s,
  			       struct wpa_driver_scan_params *params,
  			       size_t max_ssids)
  {
  	unsigned int i;
  	struct wpa_ssid *ssid;
  
  	/*
  	 * For devices with max_ssids greater than 1, leave the last slot empty
  	 * for adding the wildcard scan entry.
  	 */
  	max_ssids = max_ssids > 1 ? max_ssids - 1 : max_ssids;
  
  	for (i = 0; i < wpa_s->scan_id_count; i++) {
  		ssid = wpa_config_get_network(wpa_s->conf, wpa_s->scan_id[i]);
  		if (!ssid)
  			continue;
  		if (ssid->scan_ssid)
  			wpa_add_scan_ssid(wpa_s, params, max_ssids,
  					  ssid->ssid, ssid->ssid_len);
  		/*
  		 * Also add the SSID of the OWE BSS, to allow discovery of
  		 * transition mode APs more quickly.
  		 */
  		wpa_add_owe_scan_ssid(wpa_s, params, ssid, max_ssids);
  	}
  
  	wpa_s->scan_id_count = 0;
  }
  
  
  static int wpa_set_ssids_from_scan_req(struct wpa_supplicant *wpa_s,
  				       struct wpa_driver_scan_params *params,
  				       size_t max_ssids)
  {
  	unsigned int i;
  
  	if (wpa_s->ssids_from_scan_req == NULL ||
  	    wpa_s->num_ssids_from_scan_req == 0)
  		return 0;
  
  	if (wpa_s->num_ssids_from_scan_req > max_ssids) {
  		wpa_s->num_ssids_from_scan_req = max_ssids;
  		wpa_printf(MSG_DEBUG, "Over max scan SSIDs from scan req: %u",
  			   (unsigned int) max_ssids);
  	}
  
  	for (i = 0; i < wpa_s->num_ssids_from_scan_req; i++) {
  		params->ssids[i].ssid = wpa_s->ssids_from_scan_req[i].ssid;
  		params->ssids[i].ssid_len =
  			wpa_s->ssids_from_scan_req[i].ssid_len;
  		wpa_hexdump_ascii(MSG_DEBUG, "specific SSID",
  				  params->ssids[i].ssid,
  				  params->ssids[i].ssid_len);
  	}
  
  	params->num_ssids = wpa_s->num_ssids_from_scan_req;
  	wpa_s->num_ssids_from_scan_req = 0;
  	return 1;
  }
  
  
  void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx)
  {
  	struct wpa_supplicant *wpa_s = eloop_ctx;
  	struct wpa_ssid *ssid;
  	int ret, p2p_in_prog;
  	struct wpabuf *extra_ie = NULL;
  	struct wpa_driver_scan_params params;
  	struct wpa_driver_scan_params *scan_params;
  	size_t max_ssids;
  	int connect_without_scan = 0;
  
  	wpa_s->ignore_post_flush_scan_res = 0;
  
  	if (wpa_s->wpa_state == WPA_INTERFACE_DISABLED) {
  		wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - interface disabled");
  		return;
  	}
  
  	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_s->scanning) {
  		/*
  		 * If we are already in scanning state, we shall reschedule the
  		 * the incoming scan request.
  		 */
  		wpa_dbg(wpa_s, MSG_DEBUG, "Already scanning - Reschedule the incoming scan req");
  		wpa_supplicant_req_scan(wpa_s, 1, 0);
  		return;
  	}
  
  	if (!wpa_supplicant_enabled_networks(wpa_s) &&
  	    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);
  		return;
  	}
  
  	if (wpa_s->conf->ap_scan != 0 &&
  	    (wpa_s->drv_flags & WPA_DRIVER_FLAGS_WIRED)) {
  		wpa_dbg(wpa_s, MSG_DEBUG, "Using wired authentication - "
  			"overriding ap_scan configuration");
  		wpa_s->conf->ap_scan = 0;
  		wpas_notify_ap_scan_changed(wpa_s);
  	}
  
  	if (wpa_s->conf->ap_scan == 0) {
  		wpa_supplicant_gen_assoc_event(wpa_s);
  		return;
  	}
  
  	ssid = NULL;
  	if (wpa_s->scan_req != MANUAL_SCAN_REQ &&
  	    wpa_s->connect_without_scan) {
  		connect_without_scan = 1;
  		for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
  			if (ssid == wpa_s->connect_without_scan)
  				break;
  		}
  	}
  
  	p2p_in_prog = wpas_p2p_in_progress(wpa_s);
  	if (p2p_in_prog && p2p_in_prog != 2 &&
  	    (!ssid ||
  	     (ssid->mode != WPAS_MODE_AP && ssid->mode != WPAS_MODE_P2P_GO))) {
  		wpa_dbg(wpa_s, MSG_DEBUG, "Delay station mode scan while P2P operation is in progress");
  		wpa_supplicant_req_scan(wpa_s, 5, 0);
  		return;
  	}
  
  	/*
  	 * Don't cancel the scan based on ongoing PNO; defer it. Some scans are
  	 * used for changing modes inside wpa_supplicant (roaming,
  	 * auto-reconnect, etc). Discarding the scan might hurt these processes.
  	 * The normal use case for PNO is to suspend the host immediately after
  	 * starting PNO, so the periodic 100 ms attempts to run the scan do not
  	 * normally happen in practice multiple times, i.e., this is simply
  	 * restarting scanning once the host is woken up and PNO stopped.
  	 */
  	if (wpa_s->pno || wpa_s->pno_sched_pending) {
  		wpa_dbg(wpa_s, MSG_DEBUG, "Defer scan - PNO is in progress");
  		wpa_supplicant_req_scan(wpa_s, 0, 100000);
  		return;
  	}
  
  	if (wpa_s->conf->ap_scan == 2)
  		max_ssids = 1;
  	else {
  		max_ssids = wpa_s->max_scan_ssids;
  		if (max_ssids > WPAS_MAX_SCAN_SSIDS)
  			max_ssids = WPAS_MAX_SCAN_SSIDS;
  	}
  
  	wpa_s->last_scan_req = wpa_s->scan_req;
  	wpa_s->scan_req = NORMAL_SCAN_REQ;
  
  	if (connect_without_scan) {
  		wpa_s->connect_without_scan = NULL;
  		if (ssid) {
  			wpa_printf(MSG_DEBUG, "Start a pre-selected network "
  				   "without scan step");
  			wpa_supplicant_associate(wpa_s, NULL, ssid);
  			return;
  		}
  	}
  
  	os_memset(&params, 0, sizeof(params));
  
  	wpa_s->scan_prev_wpa_state = wpa_s->wpa_state;
  	if (wpa_s->wpa_state == WPA_DISCONNECTED ||
  	    wpa_s->wpa_state == WPA_INACTIVE)
  		wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
  
  	/*
  	 * If autoscan has set its own scanning parameters
  	 */
  	if (wpa_s->autoscan_params != NULL) {
  		scan_params = wpa_s->autoscan_params;
  		goto scan;
  	}
  
  	if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
  	    wpa_set_ssids_from_scan_req(wpa_s, &params, max_ssids)) {
  		wpa_printf(MSG_DEBUG, "Use specific SSIDs from SCAN command");
  		goto ssid_list_set;
  	}
  
  #ifdef CONFIG_P2P
  	if ((wpa_s->p2p_in_provisioning || wpa_s->show_group_started) &&
  	    wpa_s->go_params && !wpa_s->conf->passive_scan) {
  		wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during P2P group formation (p2p_in_provisioning=%d show_group_started=%d)",
  			   wpa_s->p2p_in_provisioning,
  			   wpa_s->show_group_started);
  		params.ssids[0].ssid = wpa_s->go_params->ssid;
  		params.ssids[0].ssid_len = wpa_s->go_params->ssid_len;
  		params.num_ssids = 1;
  		goto ssid_list_set;
  	}
  
  	if (wpa_s->p2p_in_invitation) {
  		if (wpa_s->current_ssid) {
  			wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during invitation");
  			params.ssids[0].ssid = wpa_s->current_ssid->ssid;
  			params.ssids[0].ssid_len =
  				wpa_s->current_ssid->ssid_len;
  			params.num_ssids = 1;
  		} else {
  			wpa_printf(MSG_DEBUG, "P2P: No specific SSID known for scan during invitation");
  		}
  		goto ssid_list_set;
  	}
  #endif /* CONFIG_P2P */
  
  	/* Find the starting point from which to continue scanning */
  	ssid = wpa_s->conf->ssid;
  	if (wpa_s->prev_scan_ssid != WILDCARD_SSID_SCAN) {
  		while (ssid) {
  			if (ssid == wpa_s->prev_scan_ssid) {
  				ssid = ssid->next;
  				break;
  			}
  			ssid = ssid->next;
  		}
  	}
  
  	if (wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
  #ifdef CONFIG_AP
  	    !wpa_s->ap_iface &&
  #endif /* CONFIG_AP */
  	    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);
  		return;
  	} else if (wpa_s->conf->ap_scan == 2) {
  		/*
  		 * User-initiated scan request in ap_scan == 2; scan with
  		 * wildcard SSID.
  		 */
  		ssid = NULL;
  	} else if (wpa_s->reattach && wpa_s->current_ssid != NULL) {
  		/*
  		 * Perform single-channel single-SSID scan for
  		 * reassociate-to-same-BSS operation.
  		 */
  		/* Setup SSID */
  		ssid = wpa_s->current_ssid;
  		wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
  				  ssid->ssid, ssid->ssid_len);
  		params.ssids[0].ssid = ssid->ssid;
  		params.ssids[0].ssid_len = ssid->ssid_len;
  		params.num_ssids = 1;
  
  		/*
  		 * Allocate memory for frequency array, allocate one extra
  		 * slot for the zero-terminator.
  		 */
  		params.freqs = os_malloc(sizeof(int) * 2);
  		if (params.freqs) {
  			params.freqs[0] = wpa_s->assoc_freq;
  			params.freqs[1] = 0;
  		}
  
  		/*
  		 * Reset the reattach flag so that we fall back to full scan if
  		 * this scan fails.
  		 */
  		wpa_s->reattach = 0;
  	} else {
  		struct wpa_ssid *start = ssid, *tssid;
  		int freqs_set = 0;
  		if (ssid == NULL && max_ssids > 1)
  			ssid = wpa_s->conf->ssid;
  		while (ssid) {
  			if (!wpas_network_disabled(wpa_s, ssid) &&
  			    ssid->scan_ssid) {
  				wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
  						  ssid->ssid, ssid->ssid_len);
  				params.ssids[params.num_ssids].ssid =
  					ssid->ssid;
  				params.ssids[params.num_ssids].ssid_len =
  					ssid->ssid_len;
  				params.num_ssids++;
  				if (params.num_ssids + 1 >= max_ssids)
  					break;
  			}
  
  			if (!wpas_network_disabled(wpa_s, ssid)) {
  				/*
  				 * Also add the SSID of the OWE BSS, to allow
  				 * discovery of transition mode APs more
  				 * quickly.
  				 */
  				wpa_add_owe_scan_ssid(wpa_s, &params, ssid,
  						      max_ssids);
  			}
  
  			ssid = ssid->next;
  			if (ssid == start)
  				break;
  			if (ssid == NULL && max_ssids > 1 &&
  			    start != wpa_s->conf->ssid)
  				ssid = wpa_s->conf->ssid;
  		}
  
  		if (wpa_s->scan_id_count &&
  		    wpa_s->last_scan_req == MANUAL_SCAN_REQ)
  			wpa_set_scan_ssids(wpa_s, &params, max_ssids);
  
  		for (tssid = wpa_s->conf->ssid;
  		     wpa_s->last_scan_req != MANUAL_SCAN_REQ && tssid;
  		     tssid = tssid->next) {
  			if (wpas_network_disabled(wpa_s, tssid))
  				continue;
  			if (((params.freqs || !freqs_set) &&
  			     tssid->scan_freq) &&
  			    int_array_len(params.freqs) < 100) {
  				int_array_concat(&params.freqs,
  						 tssid->scan_freq);
  			} else {
  				os_free(params.freqs);
  				params.freqs = NULL;
  			}
  			freqs_set = 1;
  		}
  		int_array_sort_unique(params.freqs);
  	}
  
  	if (ssid && max_ssids == 1) {
  		/*
  		 * If the driver is limited to 1 SSID at a time interleave
  		 * wildcard SSID scans with specific SSID scans to avoid
  		 * waiting a long time for a wildcard scan.
  		 */
  		if (!wpa_s->prev_scan_wildcard) {
  			params.ssids[0].ssid = NULL;
  			params.ssids[0].ssid_len = 0;
  			wpa_s->prev_scan_wildcard = 1;
  			wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for "
  				"wildcard SSID (Interleave with specific)");
  		} else {
  			wpa_s->prev_scan_ssid = ssid;
  			wpa_s->prev_scan_wildcard = 0;
  			wpa_dbg(wpa_s, MSG_DEBUG,
  				"Starting AP scan for specific SSID: %s",
  				wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
  		}
  	} else if (ssid) {
  		/* max_ssids > 1 */
  
  		wpa_s->prev_scan_ssid = ssid;
  		wpa_dbg(wpa_s, MSG_DEBUG, "Include wildcard SSID in "
  			"the scan request");
  		params.num_ssids++;
  	} else if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
  		   wpa_s->manual_scan_passive && params.num_ssids == 0) {
  		wpa_dbg(wpa_s, MSG_DEBUG, "Use passive scan based on manual request");
  	} else if (wpa_s->conf->passive_scan) {
  		wpa_dbg(wpa_s, MSG_DEBUG,
  			"Use passive scan based on configuration");
  	} else {
  		wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
  		params.num_ssids++;
  		wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for wildcard "
  			"SSID");
  	}
  
  ssid_list_set:
  	wpa_supplicant_optimize_freqs(wpa_s, &params);
  	extra_ie = wpa_supplicant_extra_ies(wpa_s);
  
  	if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
  	    wpa_s->manual_scan_only_new) {
  		wpa_printf(MSG_DEBUG,
  			   "Request driver to clear scan cache due to manual only_new=1 scan");
  		params.only_new_results = 1;
  	}
  
  	if (wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs == NULL &&
  	    wpa_s->manual_scan_freqs) {
  		wpa_dbg(wpa_s, MSG_DEBUG, "Limit manual scan to specified channels");
  		params.freqs = wpa_s->manual_scan_freqs;
  		wpa_s->manual_scan_freqs = NULL;
  	}
  
  	if (params.freqs == NULL && wpa_s->select_network_scan_freqs) {
  		wpa_dbg(wpa_s, MSG_DEBUG,
  			"Limit select_network scan to specified channels");
  		params.freqs = wpa_s->select_network_scan_freqs;
  		wpa_s->select_network_scan_freqs = NULL;
  	}
  
  	if (params.freqs == NULL && wpa_s->next_scan_freqs) {
  		wpa_dbg(wpa_s, MSG_DEBUG, "Optimize scan based on previously "
  			"generated frequency list");
  		params.freqs = wpa_s->next_scan_freqs;
  	} else
  		os_free(wpa_s->next_scan_freqs);
  	wpa_s->next_scan_freqs = NULL;
  
  	/* Use current associated channel? */
  	if (wpa_s->conf->scan_cur_freq && !params.freqs) {
  		unsigned int num = wpa_s->num_multichan_concurrent;
  
  		params.freqs = os_calloc(num + 1, sizeof(int));
  		if (params.freqs) {
  			num = get_shared_radio_freqs(wpa_s, params.freqs, num);
  			if (num > 0) {
  				wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the "
  					"current operating channels since "
  					"scan_cur_freq is enabled");
  			} else {
  				os_free(params.freqs);
  				params.freqs = NULL;
  			}
  		}
  	}
  
  #ifdef CONFIG_MBO
  	if (wpa_s->enable_oce & OCE_STA)
  		params.oce_scan = 1;
  #endif /* CONFIG_MBO */
  
  	wpa_setband_scan_freqs(wpa_s, &params);
  
  	/* See if user specified frequencies. If so, scan only those. */
  	if (wpa_s->last_scan_req == INITIAL_SCAN_REQ &&
  	    wpa_s->conf->initial_freq_list && !params.freqs) {
  		wpa_dbg(wpa_s, MSG_DEBUG,
  			"Optimize scan based on conf->initial_freq_list");
  		int_array_concat(&params.freqs, wpa_s->conf->initial_freq_list);
  	} else if (wpa_s->conf->freq_list && !params.freqs) {
  		wpa_dbg(wpa_s, MSG_DEBUG,
  			"Optimize scan based on conf->freq_list");
  		int_array_concat(&params.freqs, wpa_s->conf->freq_list);
  	}
  
  	params.filter_ssids = wpa_supplicant_build_filter_ssids(
  		wpa_s->conf, &params.num_filter_ssids);
  	if (extra_ie) {
  		params.extra_ies = wpabuf_head(extra_ie);
  		params.extra_ies_len = wpabuf_len(extra_ie);
  	}
  
  #ifdef CONFIG_P2P
  	if (wpa_s->p2p_in_provisioning || wpa_s->p2p_in_invitation ||
  	    (wpa_s->show_group_started && wpa_s->go_params)) {
  		/*
  		 * The interface may not yet be in P2P mode, so we have to
  		 * explicitly request P2P probe to disable CCK rates.
  		 */
  		params.p2p_probe = 1;
  	}
  #endif /* CONFIG_P2P */
  
  	if ((wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_SCAN) &&
  	    wpa_s->wpa_state <= WPA_SCANNING)
  		wpa_setup_mac_addr_rand_params(&params, wpa_s->mac_addr_scan);
  
  	if (!is_zero_ether_addr(wpa_s->next_scan_bssid)) {
  		struct wpa_bss *bss;
  
  		params.bssid = wpa_s->next_scan_bssid;
  		bss = wpa_bss_get_bssid_latest(wpa_s, params.bssid);
  		if (!wpa_s->next_scan_bssid_wildcard_ssid &&
  		    bss && bss->ssid_len && params.num_ssids == 1 &&
  		    params.ssids[0].ssid_len == 0) {
  			params.ssids[0].ssid = bss->ssid;
  			params.ssids[0].ssid_len = bss->ssid_len;
  			wpa_dbg(wpa_s, MSG_DEBUG,
  				"Scan a previously specified BSSID " MACSTR
  				" and SSID %s",
  				MAC2STR(params.bssid),
  				wpa_ssid_txt(bss->ssid, bss->ssid_len));
  		} else {
  			wpa_dbg(wpa_s, MSG_DEBUG,
  				"Scan a previously specified BSSID " MACSTR,
  				MAC2STR(params.bssid));
  		}
  	}
  
  	scan_params = &params;
  
  scan:
  #ifdef CONFIG_P2P
  	/*
  	 * If the driver does not support multi-channel concurrency and a
  	 * virtual interface that shares the same radio with the wpa_s interface
  	 * is operating there may not be need to scan other channels apart from
  	 * the current operating channel on the other virtual interface. Filter
  	 * out other channels in case we are trying to find a connection for a
  	 * 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 &&
  	    wpa_s->last_scan_req == NORMAL_SCAN_REQ &&
  	    !scan_params->freqs && !params.freqs &&
  	    wpas_is_p2p_prioritized(wpa_s) &&
  	    wpa_s->p2p_group_interface == NOT_P2P_GROUP_INTERFACE &&
  	    non_p2p_network_enabled(wpa_s)) {
  		unsigned int num = wpa_s->num_multichan_concurrent;
  
  		params.freqs = os_calloc(num + 1, sizeof(int));
  		if (params.freqs) {
  			num = get_shared_radio_freqs(wpa_s, params.freqs, num);
  			if (num > 0 && num == wpa_s->num_multichan_concurrent) {
  				wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the current operating channels since all channels are already used");
  			} else {
  				os_free(params.freqs);
  				params.freqs = NULL;
  			}
  		}
  	}
  #endif /* CONFIG_P2P */
  
  	ret = wpa_supplicant_trigger_scan(wpa_s, scan_params);
  
  	if (ret && wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs &&
  	    !wpa_s->manual_scan_freqs) {
  		/* Restore manual_scan_freqs for the next attempt */
  		wpa_s->manual_scan_freqs = params.freqs;
  		params.freqs = NULL;
  	}
  
  	wpabuf_free(extra_ie);
  	os_free(params.freqs);
  	os_free(params.filter_ssids);
  	os_free(params.mac_addr);
  
  	if (ret) {
  		wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate AP scan");
  		if (wpa_s->scan_prev_wpa_state != wpa_s->wpa_state)
  			wpa_supplicant_set_state(wpa_s,
  						 wpa_s->scan_prev_wpa_state);
  		/* Restore scan_req since we will try to scan again */
  		wpa_s->scan_req = wpa_s->last_scan_req;
  		wpa_supplicant_req_scan(wpa_s, 1, 0);
  	} else {
  		wpa_s->scan_for_connection = 0;
  #ifdef CONFIG_INTERWORKING
  		wpa_s->interworking_fast_assoc_tried = 0;
  #endif /* CONFIG_INTERWORKING */
  		wpa_s->next_scan_bssid_wildcard_ssid = 0;
  		if (params.bssid)
  			os_memset(wpa_s->next_scan_bssid, 0, ETH_ALEN);
  	}
  }
  
  
  void wpa_supplicant_update_scan_int(struct wpa_supplicant *wpa_s, int sec)
  {
  	struct os_reltime remaining, new_int;
  	int cancelled;
  
  	cancelled = eloop_cancel_timeout_one(wpa_supplicant_scan, wpa_s, NULL,
  					     &remaining);
  
  	new_int.sec = sec;
  	new_int.usec = 0;
  	if (cancelled && os_reltime_before(&remaining, &new_int)) {
  		new_int.sec = remaining.sec;
  		new_int.usec = remaining.usec;
  	}
  
  	if (cancelled) {
  		eloop_register_timeout(new_int.sec, new_int.usec,
  				       wpa_supplicant_scan, wpa_s, NULL);
  	}
  	wpa_s->scan_interval = sec;
  }
  
  
  /**
   * wpa_supplicant_req_scan - Schedule a scan for neighboring access points
   * @wpa_s: Pointer to wpa_supplicant data
   * @sec: Number of seconds after which to scan
   * @usec: Number of microseconds after which to scan
   *
   * This function is used to schedule a scan for neighboring access points after
   * the specified time.
   */
  void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec)
  {
  	int res;
  
  	if (wpa_s->p2p_mgmt) {
  		wpa_dbg(wpa_s, MSG_DEBUG,
  			"Ignore scan request (%d.%06d sec) on p2p_mgmt interface",
  			sec, usec);
  		return;
          }
  
  	/* With lots of VIFS, we can end up trying to scan very often.
  	 * This can cause us to not be able to associate due to missing
  	 * EAPOL key messages and such.  So, allow a minimum time between
  	 * scans.
  	 */
  	if (wpa_s->conf->min_scan_gap) {
  		int mingap;
  		struct os_reltime t;
  		os_get_reltime(&t);
  
  		mingap = wpa_s->conf->min_scan_gap
  			- (t.sec - wpa_s->last_scan_rx_sec);
  		if (mingap > wpa_s->conf->min_scan_gap)
  			mingap = wpa_s->conf->min_scan_gap;
  		if (mingap > sec)
  			sec = mingap;
  	}
  
  	res = eloop_deplete_timeout(sec, usec, wpa_supplicant_scan, wpa_s,
  				    NULL);
  	if (res == 1) {
  		wpa_dbg(wpa_s, MSG_DEBUG, "Rescheduling scan request: %d.%06d sec",
  			sec, usec);
  	} else if (res == 0) {
  		wpa_dbg(wpa_s, MSG_DEBUG, "Ignore new scan request for %d.%06d sec since an earlier request is scheduled to trigger sooner",
  			sec, usec);
  	} else {
  		wpa_dbg(wpa_s, MSG_DEBUG, "Setting scan request: %d.%06d sec",
  			sec, usec);
  		eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL);
  	}
  }
  
  
  /**
   * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan
   * @wpa_s: Pointer to wpa_supplicant data
   * @sec: Number of seconds after which to scan
   * @usec: Number of microseconds after which to scan
   * Returns: 0 on success or -1 otherwise
   *
   * This function is used to schedule periodic scans for neighboring
   * access points after the specified time.
   */
  int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant *wpa_s,
  				      int sec, int usec)
  {
  	if (!wpa_s->sched_scan_supported)
  		return -1;
  
  	eloop_register_timeout(sec, usec,
  			       wpa_supplicant_delayed_sched_scan_timeout,
  			       wpa_s, NULL);
  
  	return 0;
  }
  
  
  static void
  wpa_scan_set_relative_rssi_params(struct wpa_supplicant *wpa_s,
  				  struct wpa_driver_scan_params *params)
  {
  	if (wpa_s->wpa_state != WPA_COMPLETED ||
  	    !(wpa_s->drv_flags & WPA_DRIVER_FLAGS_SCHED_SCAN_RELATIVE_RSSI) ||
  	    wpa_s->srp.relative_rssi_set == 0)
  		return;
  
  	params->relative_rssi_set = 1;
  	params->relative_rssi = wpa_s->srp.relative_rssi;
  
  	if (wpa_s->srp.relative_adjust_rssi == 0)
  		return;
  
  	params->relative_adjust_band = wpa_s->srp.relative_adjust_band;
  	params->relative_adjust_rssi = wpa_s->srp.relative_adjust_rssi;
  }
  
  
  /**
   * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan
   * @wpa_s: Pointer to wpa_supplicant data
   * Returns: 0 is sched_scan was started or -1 otherwise
   *
   * This function is used to schedule periodic scans for neighboring
   * access points repeating the scan continuously.
   */
  int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s)
  {
  	struct wpa_driver_scan_params params;
  	struct wpa_driver_scan_params *scan_params;
  	enum wpa_states prev_state;
  	struct wpa_ssid *ssid = NULL;
  	struct wpabuf *extra_ie = NULL;
  	int ret;
  	unsigned int max_sched_scan_ssids;
  	int wildcard = 0;
  	int need_ssids;
  	struct sched_scan_plan scan_plan;
  
  	if (!wpa_s->sched_scan_supported)
  		return -1;
  
  	if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS)
  		max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS;
  	else
  		max_sched_scan_ssids = wpa_s->max_sched_scan_ssids;
  	if (max_sched_scan_ssids < 1 || wpa_s->conf->disable_scan_offload)
  		return -1;
  
  	wpa_s->sched_scan_stop_req = 0;
  
  	if (wpa_s->sched_scanning) {
  		wpa_dbg(wpa_s, MSG_DEBUG, "Already sched scanning");
  		return 0;
  	}
  
  	need_ssids = 0;
  	for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
  		if (!wpas_network_disabled(wpa_s, ssid) && !ssid->scan_ssid) {
  			/* Use wildcard SSID to find this network */
  			wildcard = 1;
  		} else if (!wpas_network_disabled(wpa_s, ssid) &&
  			   ssid->ssid_len)
  			need_ssids++;
  
  #ifdef CONFIG_WPS
  		if (!wpas_network_disabled(wpa_s, ssid) &&
  		    ssid->key_mgmt == WPA_KEY_MGMT_WPS) {
  			/*
  			 * Normal scan is more reliable and faster for WPS
  			 * operations and since these are for short periods of
  			 * time, the benefit of trying to use sched_scan would
  			 * be limited.
  			 */
  			wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
  				"sched_scan for WPS");
  			return -1;
  		}
  #endif /* CONFIG_WPS */
  	}
  	if (wildcard)
  		need_ssids++;
  
  	if (wpa_s->normal_scans < 3 &&
  	    (need_ssids <= wpa_s->max_scan_ssids ||
  	     wpa_s->max_scan_ssids >= (int) max_sched_scan_ssids)) {
  		/*
  		 * When normal scan can speed up operations, use that for the
  		 * first operations before starting the sched_scan to allow
  		 * user space sleep more. We do this only if the normal scan
  		 * has functionality that is suitable for this or if the
  		 * sched_scan does not have better support for multiple SSIDs.
  		 */
  		wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
  			"sched_scan for initial scans (normal_scans=%d)",
  			wpa_s->normal_scans);
  		return -1;
  	}
  
  	os_memset(&params, 0, sizeof(params));
  
  	/* If we can't allocate space for the filters, we just don't filter */
  	params.filter_ssids = os_calloc(wpa_s->max_match_sets,
  					sizeof(struct wpa_driver_scan_filter));
  
  	prev_state = wpa_s->wpa_state;
  	if (wpa_s->wpa_state == WPA_DISCONNECTED ||
  	    wpa_s->wpa_state == WPA_INACTIVE)
  		wpa_supplicant_set_state(wpa_s, WPA_SCANNING);
  
  	if (wpa_s->autoscan_params != NULL) {
  		scan_params = wpa_s->autoscan_params;
  		goto scan;
  	}
  
  	/* Find the starting point from which to continue scanning */
  	ssid = wpa_s->conf->ssid;
  	if (wpa_s->prev_sched_ssid) {
  		while (ssid) {
  			if (ssid == wpa_s->prev_sched_ssid) {
  				ssid = ssid->next;
  				break;
  			}
  			ssid = ssid->next;
  		}
  	}
  
  	if (!ssid || !wpa_s->prev_sched_ssid) {
  		wpa_dbg(wpa_s, MSG_DEBUG, "Beginning of SSID list");
  		wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
  		wpa_s->first_sched_scan = 1;
  		ssid = wpa_s->conf->ssid;
  		wpa_s->prev_sched_ssid = ssid;
  	}
  
  	if (wildcard) {
  		wpa_dbg(wpa_s, MSG_DEBUG, "Add wildcard SSID to sched_scan");
  		params.num_ssids++;
  	}
  
  	while (ssid) {
  		if (wpas_network_disabled(wpa_s, ssid))
  			goto next;
  
  		if (params.num_filter_ssids < wpa_s->max_match_sets &&
  		    params.filter_ssids && ssid->ssid && ssid->ssid_len) {
  			wpa_dbg(wpa_s, MSG_DEBUG, "add to filter ssid: %s",
  				wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
  			os_memcpy(params.filter_ssids[params.num_filter_ssids].ssid,
  				  ssid->ssid, ssid->ssid_len);
  			params.filter_ssids[params.num_filter_ssids].ssid_len =
  				ssid->ssid_len;
  			params.num_filter_ssids++;
  		} else if (params.filter_ssids && ssid->ssid && ssid->ssid_len)
  		{
  			wpa_dbg(wpa_s, MSG_DEBUG, "Not enough room for SSID "
  				"filter for sched_scan - drop filter");
  			os_free(params.filter_ssids);
  			params.filter_ssids = NULL;
  			params.num_filter_ssids = 0;
  		}
  
  		if (ssid->scan_ssid && ssid->ssid && ssid->ssid_len) {
  			if (params.num_ssids == max_sched_scan_ssids)
  				break; /* only room for broadcast SSID */
  			wpa_dbg(wpa_s, MSG_DEBUG,
  				"add to active scan ssid: %s",
  				wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
  			params.ssids[params.num_ssids].ssid =
  				ssid->ssid;
  			params.ssids[params.num_ssids].ssid_len =
  				ssid->ssid_len;
  			params.num_ssids++;
  			if (params.num_ssids >= max_sched_scan_ssids) {
  				wpa_s->prev_sched_ssid = ssid;
  				do {
  					ssid = ssid->next;
  				} while (ssid &&
  					 (wpas_network_disabled(wpa_s, ssid) ||
  					  !ssid->scan_ssid));
  				break;
  			}
  		}
  
  	next:
  		wpa_s->prev_sched_ssid = ssid;
  		ssid = ssid->next;
  	}
  
  	if (params.num_filter_ssids == 0) {
  		os_free(params.filter_ssids);
  		params.filter_ssids = NULL;
  	}
  
  	extra_ie = wpa_supplicant_extra_ies(wpa_s);
  	if (extra_ie) {
  		params.extra_ies = wpabuf_head(extra_ie);
  		params.extra_ies_len = wpabuf_len(extra_ie);
  	}
  
  	if (wpa_s->conf->filter_rssi)
  		params.filter_rssi = wpa_s->conf->filter_rssi;
  
  	/* See if user specified frequencies. If so, scan only those. */
  	if (wpa_s->conf->freq_list && !params.freqs) {
  		wpa_dbg(wpa_s, MSG_DEBUG,
  			"Optimize scan based on conf->freq_list");
  		int_array_concat(&params.freqs, wpa_s->conf->freq_list);
  	}
  
  #ifdef CONFIG_MBO
  	if (wpa_s->enable_oce & OCE_STA)
  		params.oce_scan = 1;
  #endif /* CONFIG_MBO */
  
  	scan_params = &params;
  
  scan:
  	wpa_s->sched_scan_timed_out = 0;
  
  	/*
  	 * We cannot support multiple scan plans if the scan request includes
  	 * too many SSID's, so in this case use only the last scan plan and make
  	 * it run infinitely. It will be stopped by the timeout.
  	 */
  	if (wpa_s->sched_scan_plans_num == 1 ||
  	    (wpa_s->sched_scan_plans_num && !ssid && wpa_s->first_sched_scan)) {
  		params.sched_scan_plans = wpa_s->sched_scan_plans;
  		params.sched_scan_plans_num = wpa_s->sched_scan_plans_num;
  	} else if (wpa_s->sched_scan_plans_num > 1) {
  		wpa_dbg(wpa_s, MSG_DEBUG,
  			"Too many SSIDs. Default to using single scheduled_scan plan");
  		params.sched_scan_plans =
  			&wpa_s->sched_scan_plans[wpa_s->sched_scan_plans_num -
  						 1];
  		params.sched_scan_plans_num = 1;
  	} else {
  		if (wpa_s->conf->sched_scan_interval)
  			scan_plan.interval = wpa_s->conf->sched_scan_interval;
  		else
  			scan_plan.interval = 10;
  
  		if (scan_plan.interval > wpa_s->max_sched_scan_plan_interval) {
  			wpa_printf(MSG_WARNING,
  				   "Scan interval too long(%u), use the maximum allowed(%u)",
  				   scan_plan.interval,
  				   wpa_s->max_sched_scan_plan_interval);
  			scan_plan.interval =
  				wpa_s->max_sched_scan_plan_interval;
  		}
  
  		scan_plan.iterations = 0;
  		params.sched_scan_plans = &scan_plan;
  		params.sched_scan_plans_num = 1;
  	}
  
  	params.sched_scan_start_delay = wpa_s->conf->sched_scan_start_delay;
  
  	if (ssid || !wpa_s->first_sched_scan) {
  		wpa_dbg(wpa_s, MSG_DEBUG,
  			"Starting sched scan after %u seconds: interval %u timeout %d",
  			params.sched_scan_start_delay,
  			params.sched_scan_plans[0].interval,
  			wpa_s->sched_scan_timeout);
  	} else {
  		wpa_dbg(wpa_s, MSG_DEBUG,
  			"Starting sched scan after %u seconds (no timeout)",
  			params.sched_scan_start_delay);
  	}
  
  	wpa_setband_scan_freqs(wpa_s, scan_params);
  
  	if ((wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_SCHED_SCAN) &&
  	    wpa_s->wpa_state <= WPA_SCANNING)
  		wpa_setup_mac_addr_rand_params(&params,
  					       wpa_s->mac_addr_sched_scan);
  
  	wpa_scan_set_relative_rssi_params(wpa_s, scan_params);
  
  	ret = wpa_supplicant_start_sched_scan(wpa_s, scan_params);
  	wpabuf_free(extra_ie);
  	os_free(params.filter_ssids);
  	os_free(params.mac_addr);
  	if (ret) {
  		wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate sched scan");
  		if (prev_state != wpa_s->wpa_state)
  			wpa_supplicant_set_state(wpa_s, prev_state);
  		return ret;
  	}
  
  	/* If we have more SSIDs to scan, add a timeout so we scan them too */
  	if (ssid || !wpa_s->first_sched_scan) {
  		wpa_s->sched_scan_timed_out = 0;
  		eloop_register_timeout(wpa_s->sched_scan_timeout, 0,
  				       wpa_supplicant_sched_scan_timeout,
  				       wpa_s, NULL);
  		wpa_s->first_sched_scan = 0;
  		wpa_s->sched_scan_timeout /= 2;
  		params.sched_scan_plans[0].interval *= 2;
  		if ((unsigned int) wpa_s->sched_scan_timeout <
  		    params.sched_scan_plans[0].interval ||
  		    params.sched_scan_plans[0].interval >
  		    wpa_s->max_sched_scan_plan_interval) {
  			params.sched_scan_plans[0].interval = 10;
  			wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
  		}
  	}
  
  	/* If there is no more ssids, start next time from the beginning */
  	if (!ssid)
  		wpa_s->prev_sched_ssid = NULL;
  
  	return 0;
  }
  
  
  /**
   * wpa_supplicant_cancel_scan - Cancel a scheduled scan request
   * @wpa_s: Pointer to wpa_supplicant data
   *
   * This function is used to cancel a scan request scheduled with
   * wpa_supplicant_req_scan().
   */
  void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s)
  {
  	wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling scan request");
  	eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
  
          radio_remove_works(wpa_s, "scan", 0);
  	wpa_remove_scan_work(wpa_s, "cancel-scan", 1);
  }
  
  
  /**
   * wpa_supplicant_cancel_delayed_sched_scan - Stop a delayed scheduled scan
   * @wpa_s: Pointer to wpa_supplicant data
   *
   * This function is used to stop a delayed scheduled scan.
   */
  void wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant *wpa_s)
  {
  	if (!wpa_s->sched_scan_supported)
  		return;
  
  	wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling delayed sched scan");
  	eloop_cancel_timeout(wpa_supplicant_delayed_sched_scan_timeout,
  			     wpa_s, NULL);
  }
  
  
  /**
   * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans
   * @wpa_s: Pointer to wpa_supplicant data
   *
   * This function is used to stop a periodic scheduled scan.
   */
  void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant *wpa_s)
  {
  	if (!wpa_s->sched_scanning)
  		return;
  
  	if (wpa_s->sched_scanning)
  		wpa_s->sched_scan_stop_req = 1;
  
  	wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling sched scan");
  	eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout, wpa_s, NULL);
  	wpa_supplicant_stop_sched_scan(wpa_s);
  }
  
  
  /**
   * wpa_supplicant_notify_scanning - Indicate possible scan state change
   * @wpa_s: Pointer to wpa_supplicant data
   * @scanning: Whether scanning is currently in progress
   *
   * This function is to generate scanning notifycations. It is called whenever
   * there may have been a change in scanning (scan started, completed, stopped).
   * wpas_notify_scanning() is called whenever the scanning state changed from the
   * previously notified state.
   */
  void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s,
  				    int scanning)
  {
  	if (wpa_s->scanning != scanning) {
  		wpa_s->scanning = scanning;
  		wpas_notify_scanning(wpa_s);
  	}
  }
  
  
  static int wpa_scan_get_max_rate(const struct wpa_scan_res *res)
  {
  	int rate = 0;
  	const u8 *ie;
  	int i;
  
  	ie = wpa_scan_get_ie(res, WLAN_EID_SUPP_RATES);
  	for (i = 0; ie && i < ie[1]; i++) {
  		if ((ie[i + 2] & 0x7f) > rate)
  			rate = ie[i + 2] & 0x7f;
  	}
  
  	ie = wpa_scan_get_ie(res, WLAN_EID_EXT_SUPP_RATES);
  	for (i = 0; ie && i < ie[1]; i++) {
  		if ((ie[i + 2] & 0x7f) > rate)
  			rate = ie[i + 2] & 0x7f;
  	}
  
  	return rate;
  }
  
  
  /**
   * wpa_scan_get_ie - Fetch a specified information element from a scan result
   * @res: Scan result entry
   * @ie: Information element identitifier (WLAN_EID_*)
   * Returns: Pointer to the information element (id field) or %NULL if not found
   *
   * This function returns the first matching information element in the scan
   * result.
   */
  const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie)
  {
  	size_t ie_len = res->ie_len;
  
  	/* Use the Beacon frame IEs if res->ie_len is not available */
  	if (!ie_len)
  		ie_len = res->beacon_ie_len;
  
  	return get_ie((const u8 *) (res + 1), ie_len, ie);
  }
  
  
  /**
   * wpa_scan_get_vendor_ie - Fetch vendor information element from a scan result
   * @res: Scan result entry
   * @vendor_type: Vendor type (four octets starting the IE payload)
   * Returns: Pointer to the information element (id field) or %NULL if not found
   *
   * This function returns the first matching information element in the scan
   * result.
   */
  const u8 * wpa_scan_get_vendor_ie(const struct wpa_scan_res *res,
  				  u32 vendor_type)
  {
  	const u8 *ies;
  	const struct element *elem;
  
  	ies = (const u8 *) (res + 1);
  
  	for_each_element_id(elem, WLAN_EID_VENDOR_SPECIFIC, ies, res->ie_len) {
  		if (elem->datalen >= 4 &&
  		    vendor_type == WPA_GET_BE32(elem->data))
  			return &elem->id;
  	}
  
  	return NULL;
  }
  
  
  /**
   * wpa_scan_get_vendor_ie_beacon - Fetch vendor information from a scan result
   * @res: Scan result entry
   * @vendor_type: Vendor type (four octets starting the IE payload)
   * Returns: Pointer to the information element (id field) or %NULL if not found
   *
   * This function returns the first matching information element in the scan
   * result.
   *
   * This function is like wpa_scan_get_vendor_ie(), but uses IE buffer only
   * from Beacon frames instead of either Beacon or Probe Response frames.
   */
  const u8 * wpa_scan_get_vendor_ie_beacon(const struct wpa_scan_res *res,
  					 u32 vendor_type)
  {
  	const u8 *ies;
  	const struct element *elem;
  
  	if (res->beacon_ie_len == 0)
  		return NULL;
  
  	ies = (const u8 *) (res + 1);
  	ies += res->ie_len;
  
  	for_each_element_id(elem, WLAN_EID_VENDOR_SPECIFIC, ies,
  			    res->beacon_ie_len) {
  		if (elem->datalen >= 4 &&
  		    vendor_type == WPA_GET_BE32(elem->data))
  			return &elem->id;
  	}
  
  	return NULL;
  }
  
  
  /**
   * wpa_scan_get_vendor_ie_multi - Fetch vendor IE data from a scan result
   * @res: Scan result entry
   * @vendor_type: Vendor type (four octets starting the IE payload)
   * Returns: Pointer to the information element payload or %NULL if not found
   *
   * This function returns concatenated payload of possibly fragmented vendor
   * specific information elements in the scan result. The caller is responsible
   * for freeing the returned buffer.
   */
  struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res,
  					     u32 vendor_type)
  {
  	struct wpabuf *buf;
  	const u8 *end, *pos;
  
  	buf = wpabuf_alloc(res->ie_len);
  	if (buf == NULL)
  		return NULL;
  
  	pos = (const u8 *) (res + 1);
  	end = pos + res->ie_len;
  
  	while (end - pos > 1) {
  		u8 ie, len;
  
  		ie = pos[0];
  		len = pos[1];
  		if (len > end - pos - 2)
  			break;
  		pos += 2;
  		if (ie == WLAN_EID_VENDOR_SPECIFIC && len >= 4 &&
  		    vendor_type == WPA_GET_BE32(pos))
  			wpabuf_put_data(buf, pos + 4, len - 4);
  		pos += len;
  	}
  
  	if (wpabuf_len(buf) == 0) {
  		wpabuf_free(buf);
  		buf = NULL;
  	}
  
  	return buf;
  }
  
  
  /* Compare function for sorting scan results. Return >0 if @b is considered
   * better. */
  static int wpa_scan_result_compar(const void *a, const void *b)
  {
  #define MIN(a,b) a < b ? a : b
  	struct wpa_scan_res **_wa = (void *) a;
  	struct wpa_scan_res **_wb = (void *) b;
  	struct wpa_scan_res *wa = *_wa;
  	struct wpa_scan_res *wb = *_wb;
  	int wpa_a, wpa_b;
  	int snr_a, snr_b, snr_a_full, snr_b_full;
  
  	/* WPA/WPA2 support preferred */
  	wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL ||
  		wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL;
  	wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL ||
  		wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL;
  
  	if (wpa_b && !wpa_a)
  		return 1;
  	if (!wpa_b && wpa_a)
  		return -1;
  
  	/* privacy support preferred */
  	if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 &&
  	    (wb->caps & IEEE80211_CAP_PRIVACY))
  		return 1;
  	if ((wa->caps & IEEE80211_CAP_PRIVACY) &&
  	    (wb->caps & IEEE80211_CAP_PRIVACY) == 0)
  		return -1;
  
  	if (wa->flags & wb->flags & WPA_SCAN_LEVEL_DBM) {
  		snr_a_full = wa->snr;
  		snr_a = MIN(wa->snr, GREAT_SNR);
  		snr_b_full = wb->snr;
  		snr_b = MIN(wb->snr, GREAT_SNR);
  	} else {
  		/* Level is not in dBm, so we can't calculate
  		 * SNR. Just use raw level (units unknown). */
  		snr_a = snr_a_full = wa->level;
  		snr_b = snr_b_full = wb->level;
  	}
  
  	/* If SNR is close, decide by max rate or frequency band. For cases
  	 * involving the 6 GHz band, use the throughput estimate irrespective
  	 * of the SNR difference since the LPI/VLP rules may result in
  	 * significant differences in SNR for cases where the estimated
  	 * throughput can be considerably higher with the lower SNR. */
  	if (snr_a && snr_b && (abs(snr_b - snr_a) < 7 ||
  			       is_6ghz_freq(wa->freq) ||
  			       is_6ghz_freq(wb->freq))) {
  		if (wa->est_throughput != wb->est_throughput)
  			return (int) wb->est_throughput -
  				(int) wa->est_throughput;
  	}
  	if ((snr_a && snr_b && abs(snr_b - snr_a) < 5) ||
  	    (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) {
  		if (is_6ghz_freq(wa->freq) ^ is_6ghz_freq(wb->freq))
  			return is_6ghz_freq(wa->freq) ? -1 : 1;
  		if (IS_5GHZ(wa->freq) ^ IS_5GHZ(wb->freq))
  			return IS_5GHZ(wa->freq) ? -1 : 1;
  	}
  
  	/* all things being equal, use SNR; if SNRs are
  	 * identical, use quality values since some drivers may only report
  	 * that value and leave the signal level zero */
  	if (snr_b_full == snr_a_full)
  		return wb->qual - wa->qual;
  	return snr_b_full - snr_a_full;
  #undef MIN
  }
  
  
  #ifdef CONFIG_WPS
  /* Compare function for sorting scan results when searching a WPS AP for
   * provisioning. Return >0 if @b is considered better. */
  static int wpa_scan_result_wps_compar(const void *a, const void *b)
  {
  	struct wpa_scan_res **_wa = (void *) a;
  	struct wpa_scan_res **_wb = (void *) b;
  	struct wpa_scan_res *wa = *_wa;
  	struct wpa_scan_res *wb = *_wb;
  	int uses_wps_a, uses_wps_b;
  	struct wpabuf *wps_a, *wps_b;
  	int res;
  
  	/* Optimization - check WPS IE existence before allocated memory and
  	 * doing full reassembly. */
  	uses_wps_a = wpa_scan_get_vendor_ie(wa, WPS_IE_VENDOR_TYPE) != NULL;
  	uses_wps_b = wpa_scan_get_vendor_ie(wb, WPS_IE_VENDOR_TYPE) != NULL;
  	if (uses_wps_a && !uses_wps_b)
  		return -1;
  	if (!uses_wps_a && uses_wps_b)
  		return 1;
  
  	if (uses_wps_a && uses_wps_b) {
  		wps_a = wpa_scan_get_vendor_ie_multi(wa, WPS_IE_VENDOR_TYPE);
  		wps_b = wpa_scan_get_vendor_ie_multi(wb, WPS_IE_VENDOR_TYPE);
  		res = wps_ap_priority_compar(wps_a, wps_b);
  		wpabuf_free(wps_a);
  		wpabuf_free(wps_b);
  		if (res)
  			return res;
  	}
  
  	/*
  	 * Do not use current AP security policy as a sorting criteria during
  	 * WPS provisioning step since the AP may get reconfigured at the
  	 * completion of provisioning.
  	 */
  
  	/* all things being equal, use signal level; if signal levels are
  	 * identical, use quality values since some drivers may only report
  	 * that value and leave the signal level zero */
  	if (wb->level == wa->level)
  		return wb->qual - wa->qual;
  	return wb->level - wa->level;
  }
  #endif /* CONFIG_WPS */
  
  
  static void dump_scan_res(struct wpa_scan_results *scan_res)
  {
  #ifndef CONFIG_NO_STDOUT_DEBUG
  	size_t i;
  
  	if (scan_res->res == NULL || scan_res->num == 0)
  		return;
  
  	wpa_printf(MSG_EXCESSIVE, "Sorted scan results");
  
  	for (i = 0; i < scan_res->num; i++) {
  		struct wpa_scan_res *r = scan_res->res[i];
  		u8 *pos;
  		if (r->flags & WPA_SCAN_LEVEL_DBM) {
  			int noise_valid = !(r->flags & WPA_SCAN_NOISE_INVALID);
  
  			wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
  				   "noise=%d%s level=%d snr=%d%s flags=0x%x age=%u est=%u",
  				   MAC2STR(r->bssid), r->freq, r->qual,
  				   r->noise, noise_valid ? "" : "~", r->level,
  				   r->snr, r->snr >= GREAT_SNR ? "*" : "",
  				   r->flags,
  				   r->age, r->est_throughput);
  		} else {
  			wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
  				   "noise=%d level=%d flags=0x%x age=%u est=%u",
  				   MAC2STR(r->bssid), r->freq, r->qual,
  				   r->noise, r->level, r->flags, r->age,
  				   r->est_throughput);
  		}
  		pos = (u8 *) (r + 1);
  		if (r->ie_len)
  			wpa_hexdump(MSG_EXCESSIVE, "IEs", pos, r->ie_len);
  		pos += r->ie_len;
  		if (r->beacon_ie_len)
  			wpa_hexdump(MSG_EXCESSIVE, "Beacon IEs",
  				    pos, r->beacon_ie_len);
  	}
  #endif /* CONFIG_NO_STDOUT_DEBUG */
  }
  
  
  /**
   * wpa_supplicant_filter_bssid_match - Is the specified BSSID allowed
   * @wpa_s: Pointer to wpa_supplicant data
   * @bssid: BSSID to check
   * Returns: 0 if the BSSID is filtered or 1 if not
   *
   * This function is used to filter out specific BSSIDs from scan reslts mainly
   * for testing purposes (SET bssid_filter ctrl_iface command).
   */
  int wpa_supplicant_filter_bssid_match(struct wpa_supplicant *wpa_s,
  				      const u8 *bssid)
  {
  	size_t i;
  
  	if (wpa_s->bssid_filter == NULL)
  		return 1;
  
  	for (i = 0; i < wpa_s->bssid_filter_count; i++) {
  		if (os_memcmp(wpa_s->bssid_filter + i * ETH_ALEN, bssid,
  			      ETH_ALEN) == 0)
  			return 1;
  	}
  
  	return 0;
  }
  
  
  void filter_scan_res(struct wpa_supplicant *wpa_s,
  		     struct wpa_scan_results *res)
  {
  	size_t i, j;
  
  	if (wpa_s->bssid_filter == NULL)
  		return;
  
  	for (i = 0, j = 0; i < res->num; i++) {
  		if (wpa_supplicant_filter_bssid_match(wpa_s,
  						      res->res[i]->bssid)) {
  			res->res[j++] = res->res[i];
  		} else {
  			os_free(res->res[i]);
  			res->res[i] = NULL;
  		}
  	}
  
  	if (res->num != j) {
  		wpa_printf(MSG_DEBUG, "Filtered out %d scan results",
  			   (int) (res->num - j));
  		res->num = j;
  	}
  }
  
  
  void scan_snr(struct wpa_scan_res *res)
  {
  	if (res->flags & WPA_SCAN_NOISE_INVALID) {
  		res->noise = is_6ghz_freq(res->freq) ?
  			DEFAULT_NOISE_FLOOR_6GHZ :
  			(IS_5GHZ(res->freq) ?
  			 DEFAULT_NOISE_FLOOR_5GHZ : DEFAULT_NOISE_FLOOR_2GHZ);
  	}
  
  	if (res->flags & WPA_SCAN_LEVEL_DBM) {
  		res->snr = res->level - res->noise;
  	} else {
  		/* Level is not in dBm, so we can't calculate
  		 * SNR. Just use raw level (units unknown). */
  		res->snr = res->level;
  	}
  }
  
  
  /* Minimum SNR required to achieve a certain bitrate. */
  struct minsnr_bitrate_entry {
  	int minsnr;
  	unsigned int bitrate; /* in Mbps */
  };
  
  /* VHT needs to be enabled in order to achieve MCS8 and MCS9 rates. */
  static const int vht_mcs = 8;
  
  static const struct minsnr_bitrate_entry vht20_table[] = {
  	{ 0, 0 },
  	{ 2, 6500 },   /* HT20 MCS0 */
  	{ 5, 13000 },  /* HT20 MCS1 */
  	{ 9, 19500 },  /* HT20 MCS2 */
  	{ 11, 26000 }, /* HT20 MCS3 */
  	{ 15, 39000 }, /* HT20 MCS4 */
  	{ 18, 52000 }, /* HT20 MCS5 */
  	{ 20, 58500 }, /* HT20 MCS6 */
  	{ 25, 65000 }, /* HT20 MCS7 */
  	{ 29, 78000 }, /* VHT20 MCS8 */
  	{ -1, 78000 }  /* SNR > 29 */
  };
  
  static const struct minsnr_bitrate_entry vht40_table[] = {
  	{ 0, 0 },
  	{ 5, 13500 },   /* HT40 MCS0 */
  	{ 8, 27000 },   /* HT40 MCS1 */
  	{ 12, 40500 },  /* HT40 MCS2 */
  	{ 14, 54000 },  /* HT40 MCS3 */
  	{ 18, 81000 },  /* HT40 MCS4 */
  	{ 21, 108000 }, /* HT40 MCS5 */
  	{ 23, 121500 }, /* HT40 MCS6 */
  	{ 28, 135000 }, /* HT40 MCS7 */
  	{ 32, 162000 }, /* VHT40 MCS8 */
  	{ 34, 180000 }, /* VHT40 MCS9 */
  	{ -1, 180000 }  /* SNR > 34 */
  };
  
  static const struct minsnr_bitrate_entry vht80_table[] = {
  	{ 0, 0 },
  	{ 8, 29300 },   /* VHT80 MCS0 */
  	{ 11, 58500 },  /* VHT80 MCS1 */
  	{ 15, 87800 },  /* VHT80 MCS2 */
  	{ 17, 117000 }, /* VHT80 MCS3 */
  	{ 21, 175500 }, /* VHT80 MCS4 */
  	{ 24, 234000 }, /* VHT80 MCS5 */
  	{ 26, 263300 }, /* VHT80 MCS6 */
  	{ 31, 292500 }, /* VHT80 MCS7 */
  	{ 35, 351000 }, /* VHT80 MCS8 */
  	{ 37, 390000 }, /* VHT80 MCS9 */
  	{ -1, 390000 }  /* SNR > 37 */
  };
  
  
  static const struct minsnr_bitrate_entry vht160_table[] = {
  	{ 0, 0 },
  	{ 11, 58500 },  /* VHT160 MCS0 */
  	{ 14, 117000 }, /* VHT160 MCS1 */
  	{ 18, 175500 }, /* VHT160 MCS2 */
  	{ 20, 234000 }, /* VHT160 MCS3 */
  	{ 24, 351000 }, /* VHT160 MCS4 */
  	{ 27, 468000 }, /* VHT160 MCS5 */
  	{ 29, 526500 }, /* VHT160 MCS6 */
  	{ 34, 585000 }, /* VHT160 MCS7 */
  	{ 38, 702000 }, /* VHT160 MCS8 */
  	{ 40, 780000 }, /* VHT160 MCS9 */
  	{ -1, 780000 }  /* SNR > 37 */
  };
  
  
  static const struct minsnr_bitrate_entry he20_table[] = {
  	{ 0, 0 },
  	{ 2, 8600 },    /* HE20 MCS0 */
  	{ 5, 17200 },   /* HE20 MCS1 */
  	{ 9, 25800 },   /* HE20 MCS2 */
  	{ 11, 34400 },  /* HE20 MCS3 */
  	{ 15, 51600 },  /* HE20 MCS4 */
  	{ 18, 68800 },  /* HE20 MCS5 */
  	{ 20, 77400 },  /* HE20 MCS6 */
  	{ 25, 86000 },  /* HE20 MCS7 */
  	{ 29, 103200 }, /* HE20 MCS8 */
  	{ 31, 114700 }, /* HE20 MCS9 */
  	{ 34, 129000 }, /* HE20 MCS10 */
  	{ 36, 143400 }, /* HE20 MCS11 */
  	{ -1, 143400 }  /* SNR > 29 */
  };
  
  static const struct minsnr_bitrate_entry he40_table[] = {
  	{ 0, 0 },
  	{ 5, 17200 },   /* HE40 MCS0 */
  	{ 8, 34400 },   /* HE40 MCS1 */
  	{ 12, 51600 },  /* HE40 MCS2 */
  	{ 14, 68800 },  /* HE40 MCS3 */
  	{ 18, 103200 }, /* HE40 MCS4 */
  	{ 21, 137600 }, /* HE40 MCS5 */
  	{ 23, 154900 }, /* HE40 MCS6 */
  	{ 28, 172100 }, /* HE40 MCS7 */
  	{ 32, 206500 }, /* HE40 MCS8 */
  	{ 34, 229400 }, /* HE40 MCS9 */
  	{ 37, 258100 }, /* HE40 MCS10 */
  	{ 39, 286800 }, /* HE40 MCS11 */
  	{ -1, 286800 }  /* SNR > 34 */
  };
  
  static const struct minsnr_bitrate_entry he80_table[] = {
  	{ 0, 0 },
  	{ 8, 36000 },   /* HE80 MCS0 */
  	{ 11, 72100 },  /* HE80 MCS1 */
  	{ 15, 108100 }, /* HE80 MCS2 */
  	{ 17, 144100 }, /* HE80 MCS3 */
  	{ 21, 216200 }, /* HE80 MCS4 */
  	{ 24, 288200 }, /* HE80 MCS5 */
  	{ 26, 324300 }, /* HE80 MCS6 */
  	{ 31, 360300 }, /* HE80 MCS7 */
  	{ 35, 432400 }, /* HE80 MCS8 */
  	{ 37, 480400 }, /* HE80 MCS9 */
  	{ 40, 540400 }, /* HE80 MCS10 */
  	{ 42, 600500 }, /* HE80 MCS11 */
  	{ -1, 600500 }  /* SNR > 37 */
  };
  
  
  static const struct minsnr_bitrate_entry he160_table[] = {
  	{ 0, 0 },
  	{ 11, 72100 },   /* HE160 MCS0 */
  	{ 14, 144100 },  /* HE160 MCS1 */
  	{ 18, 216200 },  /* HE160 MCS2 */
  	{ 20, 288200 },  /* HE160 MCS3 */
  	{ 24, 432400 },  /* HE160 MCS4 */
  	{ 27, 576500 },  /* HE160 MCS5 */
  	{ 29, 648500 },  /* HE160 MCS6 */
  	{ 34, 720600 },  /* HE160 MCS7 */
  	{ 38, 864700 },  /* HE160 MCS8 */
  	{ 40, 960800 },  /* HE160 MCS9 */
  	{ 43, 1080900 }, /* HE160 MCS10 */
  	{ 45, 1201000 }, /* HE160 MCS11 */
  	{ -1, 1201000 }  /* SNR > 37 */
  };
  
  
  static unsigned int interpolate_rate(int snr, int snr0, int snr1,
  				     int rate0, int rate1)
  {
  	return rate0 + (snr - snr0) * (rate1 - rate0) / (snr1 - snr0);
  }
  
  
  static unsigned int max_rate(const struct minsnr_bitrate_entry table[],
  			     int snr, bool vht)
  {
  	const struct minsnr_bitrate_entry *prev, *entry = table;
  
  	while ((entry->minsnr != -1) &&
  	       (snr >= entry->minsnr) &&
  	       (vht || entry - table <= vht_mcs))
  		entry++;
  	if (entry == table)
  		return entry->bitrate;
  	prev = entry - 1;
  	if (entry->minsnr == -1 || (!vht && entry - table > vht_mcs))
  		return prev->bitrate;
  	return interpolate_rate(snr, prev->minsnr, entry->minsnr, prev->bitrate,
  				entry->bitrate);
  }
  
  
  static unsigned int max_ht20_rate(int snr, bool vht)
  {
  	return max_rate(vht20_table, snr, vht);
  }
  
  
  static unsigned int max_ht40_rate(int snr, bool vht)
  {
  	return max_rate(vht40_table, snr, vht);
  }
  
  
  static unsigned int max_vht80_rate(int snr)
  {
  	return max_rate(vht80_table, snr, 1);
  }
  
  
  static unsigned int max_vht160_rate(int snr)
  {
  	return max_rate(vht160_table, snr, 1);
  }
  
  
  static unsigned int max_he_rate(const struct minsnr_bitrate_entry table[],
  				int snr)
  {
  	const struct minsnr_bitrate_entry *prev, *entry = table;
  
  	while (entry->minsnr != -1 && snr >= entry->minsnr)
  		entry++;
  	if (entry == table)
  		return 0;
  	prev = entry - 1;
  	if (entry->minsnr == -1)
  		return prev->bitrate;
  	return interpolate_rate(snr, prev->minsnr, entry->minsnr,
  				prev->bitrate, entry->bitrate);
  }
  
  
  unsigned int wpas_get_est_tpt(const struct wpa_supplicant *wpa_s,
  			      const u8 *ies, size_t ies_len, int rate,
  			      int snr, int freq)
  {
  	struct hostapd_hw_modes *hw_mode;
  	unsigned int est, tmp;
  	const u8 *ie;
  
  	/* Limit based on estimated SNR */
  	if (rate > 1 * 2 && snr < 1)
  		rate = 1 * 2;
  	else if (rate > 2 * 2 && snr < 4)
  		rate = 2 * 2;
  	else if (rate > 6 * 2 && snr < 5)
  		rate = 6 * 2;
  	else if (rate > 9 * 2 && snr < 6)
  		rate = 9 * 2;
  	else if (rate > 12 * 2 && snr < 7)
  		rate = 12 * 2;
  	else if (rate > 12 * 2 && snr < 8)
  		rate = 14 * 2;
  	else if (rate > 12 * 2 && snr < 9)
  		rate = 16 * 2;
  	else if (rate > 18 * 2 && snr < 10)
  		rate = 18 * 2;
  	else if (rate > 24 * 2 && snr < 11)
  		rate = 24 * 2;
  	else if (rate > 24 * 2 && snr < 12)
  		rate = 27 * 2;
  	else if (rate > 24 * 2 && snr < 13)
  		rate = 30 * 2;
  	else if (rate > 24 * 2 && snr < 14)
  		rate = 33 * 2;
  	else if (rate > 36 * 2 && snr < 15)
  		rate = 36 * 2;
  	else if (rate > 36 * 2 && snr < 16)
  		rate = 39 * 2;
  	else if (rate > 36 * 2 && snr < 17)
  		rate = 42 * 2;
  	else if (rate > 36 * 2 && snr < 18)
  		rate = 45 * 2;
  	else if (rate > 48 * 2 && snr < 19)
  		rate = 48 * 2;
  	else if (rate > 48 * 2 && snr < 20)
  		rate = 51 * 2;
  	else if (rate > 54 * 2 && snr < 21)
  		rate = 54 * 2;
  	est = rate * 500;
  
  	hw_mode = get_mode_with_freq(wpa_s->hw.modes, wpa_s->hw.num_modes,
  				     freq);
  
  	if (hw_mode && hw_mode->ht_capab) {
  		ie = get_ie(ies, ies_len, WLAN_EID_HT_CAP);
  		if (ie) {
  			tmp = max_ht20_rate(snr, false);
  			if (tmp > est)
  				est = tmp;
  		}
  	}
  
  	if (hw_mode &&
  	    (hw_mode->ht_capab & HT_CAP_INFO_SUPP_CHANNEL_WIDTH_SET)) {
  		ie = get_ie(ies, ies_len, WLAN_EID_HT_OPERATION);
  		if (ie && ie[1] >= 2 &&
  		    (ie[3] & HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK)) {
  			tmp = max_ht40_rate(snr, false);
  			if (tmp > est)
  				est = tmp;
  		}
  	}
  
  	if (hw_mode && hw_mode->vht_capab) {
  		/* Use +1 to assume VHT is always faster than HT */
  		ie = get_ie(ies, ies_len, WLAN_EID_VHT_CAP);
  		if (ie) {
  			bool vht80 = false, vht160 = false;
  
  			tmp = max_ht20_rate(snr, true) + 1;
  			if (tmp > est)
  				est = tmp;
  
  			ie = get_ie(ies, ies_len, WLAN_EID_HT_OPERATION);
  			if (ie && ie[1] >= 2 &&
  			    (ie[3] &
  			     HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK)) {
  				tmp = max_ht40_rate(snr, true) + 1;
  				if (tmp > est)
  					est = tmp;
  			}
  
  			/* Determine VHT BSS bandwidth based on IEEE Std
  			 * 802.11-2020, Table 11-23 (VHT BSs bandwidth) */
  			ie = get_ie(ies, ies_len, WLAN_EID_VHT_OPERATION);
  			if (ie && ie[1] >= 3) {
  				u8 cw = ie[2] & VHT_OPMODE_CHANNEL_WIDTH_MASK;
  				u8 seg0 = ie[3];
  				u8 seg1 = ie[4];
  
  				if (cw)
  					vht80 = true;
  				if (cw == 2 ||
  				    (cw == 3 &&
  				     (seg1 > 0 && abs(seg1 - seg0) == 16)))
  					vht160 = true;
  				if (cw == 1 &&
  				    ((seg1 > 0 && abs(seg1 - seg0) == 8) ||
  				     (seg1 > 0 && abs(seg1 - seg0) == 16)))
  					vht160 = true;
  			}
  
  			if (vht80) {
  				tmp = max_vht80_rate(snr) + 1;
  				if (tmp > est)
  					est = tmp;
  			}
  
  			if (vht160 &&
  			    (hw_mode->vht_capab &
  			     (VHT_CAP_SUPP_CHAN_WIDTH_160MHZ |
  			      VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ))) {
  				tmp = max_vht160_rate(snr) + 1;
  				if (tmp > est)
  					est = tmp;
  			}
  		}
  	}
  
  	if (hw_mode && hw_mode->he_capab[IEEE80211_MODE_INFRA].he_supported) {
  		/* Use +2 to assume HE is always faster than HT/VHT */
  		struct ieee80211_he_capabilities *he;
  		struct he_capabilities *own_he;
  		u8 cw;
  
  		ie = get_ie_ext(ies, ies_len, WLAN_EID_EXT_HE_CAPABILITIES);
  		if (!ie || (ie[1] < 1 + IEEE80211_HE_CAPAB_MIN_LEN))
  			return est;
  		he = (struct ieee80211_he_capabilities *) &ie[3];
  		own_he = &hw_mode->he_capab[IEEE80211_MODE_INFRA];
  
  		tmp = max_he_rate(he20_table, snr) + 2;
  		if (tmp > est)
  			est = tmp;
  
  		cw = he->he_phy_capab_info[HE_PHYCAP_CHANNEL_WIDTH_SET_IDX] &
  			own_he->phy_cap[HE_PHYCAP_CHANNEL_WIDTH_SET_IDX];
  		if (cw &
  		    (IS_2P4GHZ(freq) ? HE_PHYCAP_CHANNEL_WIDTH_SET_40MHZ_IN_2G :
  		     HE_PHYCAP_CHANNEL_WIDTH_SET_40MHZ_80MHZ_IN_5G)) {
  			tmp = max_he_rate(he40_table, snr) + 2;
  			if (tmp > est)
  				est = tmp;
  		}
  
  		if (!IS_2P4GHZ(freq) &&
  		    (cw & HE_PHYCAP_CHANNEL_WIDTH_SET_40MHZ_80MHZ_IN_5G)) {
  			tmp = max_he_rate(he80_table, snr) + 2;
  			if (tmp > est)
  				est = tmp;
  		}
  
  		if (!IS_2P4GHZ(freq) &&
  		    (cw & (HE_PHYCAP_CHANNEL_WIDTH_SET_160MHZ_IN_5G |
  			   HE_PHYCAP_CHANNEL_WIDTH_SET_80PLUS80MHZ_IN_5G))) {
  			tmp = max_he_rate(he160_table, snr) + 2;
  			if (tmp > est)
  				est = tmp;
  		}
  	}
  
  	/* TODO: Take number of spatial streams into account */
  
  	return est;
  }
  
  
  void scan_est_throughput(struct wpa_supplicant *wpa_s,
  			 struct wpa_scan_res *res)
  {
  	int rate; /* max legacy rate in 500 kb/s units */
  	int snr = res->snr;
  	const u8 *ies = (const void *) (res + 1);
  	size_t ie_len = res->ie_len;
  
  	if (res->est_throughput)
  		return;
  
  	/* Get maximum legacy rate */
  	rate = wpa_scan_get_max_rate(res);
  
  	if (!ie_len)
  		ie_len = res->beacon_ie_len;
  	res->est_throughput =
  		wpas_get_est_tpt(wpa_s, ies, ie_len, rate, snr, res->freq);
  
  	/* TODO: channel utilization and AP load (e.g., from AP Beacon) */
  }
  
  
  /**
   * wpa_supplicant_get_scan_results - Get scan results
   * @wpa_s: Pointer to wpa_supplicant data
   * @info: Information about what was scanned or %NULL if not available
   * @new_scan: Whether a new scan was performed
   * Returns: Scan results, %NULL on failure
   *
   * This function request the current scan results from the driver and updates
   * the local BSS list wpa_s->bss. The caller is responsible for freeing the
   * results with wpa_scan_results_free().
   */
  struct wpa_scan_results *
  wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s,
  				struct scan_info *info, int new_scan)
  {
  	struct wpa_scan_results *scan_res;
  	size_t i;
  	int (*compar)(const void *, const void *) = wpa_scan_result_compar;
  
  	scan_res = wpa_drv_get_scan_results2(wpa_s);
  	if (scan_res == NULL) {
  		wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results");
  		return NULL;
  	}
  	if (scan_res->fetch_time.sec == 0) {
  		/*
  		 * Make sure we have a valid timestamp if the driver wrapper
  		 * does not set this.
  		 */
  		os_get_reltime(&scan_res->fetch_time);
  	}
  	filter_scan_res(wpa_s, scan_res);
  
  	for (i = 0; i < scan_res->num; i++) {
  		struct wpa_scan_res *scan_res_item = scan_res->res[i];
  
  		scan_snr(scan_res_item);
  		scan_est_throughput(wpa_s, scan_res_item);
  	}
  
  #ifdef CONFIG_WPS
  	if (wpas_wps_searching(wpa_s)) {
  		wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Order scan results with WPS "
  			"provisioning rules");
  		compar = wpa_scan_result_wps_compar;
  	}
  #endif /* CONFIG_WPS */
  
  	if (scan_res->res) {
  		qsort(scan_res->res, scan_res->num,
  		      sizeof(struct wpa_scan_res *), compar);
  	}
  	dump_scan_res(scan_res);
  
  	if (wpa_s->ignore_post_flush_scan_res) {
  		/* FLUSH command aborted an ongoing scan and these are the
  		 * results from the aborted scan. Do not process the results to
  		 * maintain flushed state. */
  		wpa_dbg(wpa_s, MSG_DEBUG,
  			"Do not update BSS table based on pending post-FLUSH scan results");
  		wpa_s->ignore_post_flush_scan_res = 0;
  		return scan_res;
  	}
  
  	wpa_bss_update_start(wpa_s);
  	for (i = 0; i < scan_res->num; i++)
  		wpa_bss_update_scan_res(wpa_s, scan_res->res[i],
  					&scan_res->fetch_time);
  	wpa_bss_update_end(wpa_s, info, new_scan);
  
  	return scan_res;
  }
  
  
  /**
   * wpa_supplicant_update_scan_results - Update scan results from the driver
   * @wpa_s: Pointer to wpa_supplicant data
   * Returns: 0 on success, -1 on failure
   *
   * This function updates the BSS table within wpa_supplicant based on the
   * currently available scan results from the driver without requesting a new
   * scan. This is used in cases where the driver indicates an association
   * (including roaming within ESS) and wpa_supplicant does not yet have the
   * needed information to complete the connection (e.g., to perform validation
   * steps in 4-way handshake).
   */
  int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s)
  {
  	struct wpa_scan_results *scan_res;
  	scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0);
  	if (scan_res == NULL)
  		return -1;
  	wpa_scan_results_free(scan_res);
  
  	return 0;
  }
  
  
  /**
   * scan_only_handler - Reports scan results
   */
  void scan_only_handler(struct wpa_supplicant *wpa_s,
  		       struct wpa_scan_results *scan_res)
  {
  	wpa_dbg(wpa_s, MSG_DEBUG, "Scan-only results received");
  	if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
  	    wpa_s->manual_scan_use_id && wpa_s->own_scan_running) {
  		wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS "id=%u",
  			     wpa_s->manual_scan_id);
  		wpa_s->manual_scan_use_id = 0;
  	} else {
  		wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS);
  	}
  	wpas_notify_scan_results(wpa_s);
  	wpas_notify_scan_done(wpa_s, 1);
  
  	wpa_remove_scan_work(wpa_s, "scan-only-handler", 1);
  
  	if (wpa_s->wpa_state == WPA_SCANNING)
  		wpa_supplicant_set_state(wpa_s, wpa_s->scan_prev_wpa_state);
  }
  
  
  int wpas_scan_scheduled(struct wpa_supplicant *wpa_s)
  {
  	return eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL);
  }
  
  
  struct wpa_driver_scan_params *
  wpa_scan_clone_params(const struct wpa_driver_scan_params *src)
  {
  	struct wpa_driver_scan_params *params;
  	size_t i;
  	u8 *n;
  
  	params = os_zalloc(sizeof(*params));
  	if (params == NULL)
  		return NULL;
  
  	for (i = 0; i < src->num_ssids; i++) {
  		if (src->ssids[i].ssid) {
  			n = os_memdup(src->ssids[i].ssid,
  				      src->ssids[i].ssid_len);
  			if (n == NULL)
  				goto failed;
  			params->ssids[i].ssid = n;
  			params->ssids[i].ssid_len = src->ssids[i].ssid_len;
  		}
  	}
  	params->num_ssids = src->num_ssids;
  
  	if (src->extra_ies) {
  		n = os_memdup(src->extra_ies, src->extra_ies_len);
  		if (n == NULL)
  			goto failed;
  		params->extra_ies = n;
  		params->extra_ies_len = src->extra_ies_len;
  	}
  
  	if (src->freqs) {
  		int len = int_array_len(src->freqs);
  		params->freqs = os_memdup(src->freqs, (len + 1) * sizeof(int));
  		if (params->freqs == NULL)
  			goto failed;
  	}
  
  	if (src->filter_ssids) {
  		params->filter_ssids = os_memdup(src->filter_ssids,
  						 sizeof(*params->filter_ssids) *
  						 src->num_filter_ssids);
  		if (params->filter_ssids == NULL)
  			goto failed;
  		params->num_filter_ssids = src->num_filter_ssids;
  	}
  
  	params->filter_rssi = src->filter_rssi;
  	params->p2p_probe = src->p2p_probe;
  	params->only_new_results = src->only_new_results;
  	params->low_priority = src->low_priority;
  	params->duration = src->duration;
  	params->duration_mandatory = src->duration_mandatory;
  	params->oce_scan = src->oce_scan;
  
  	if (src->sched_scan_plans_num > 0) {
  		params->sched_scan_plans =
  			os_memdup(src->sched_scan_plans,
  				  sizeof(*src->sched_scan_plans) *
  				  src->sched_scan_plans_num);
  		if (!params->sched_scan_plans)
  			goto failed;
  
  		params->sched_scan_plans_num = src->sched_scan_plans_num;
  	}
  
  	if (src->mac_addr_rand &&
  	    wpa_setup_mac_addr_rand_params(params, src->mac_addr))
  		goto failed;
  
  	if (src->bssid) {
  		u8 *bssid;
  
  		bssid = os_memdup(src->bssid, ETH_ALEN);
  		if (!bssid)
  			goto failed;
  		params->bssid = bssid;
  	}
  
  	params->relative_rssi_set = src->relative_rssi_set;
  	params->relative_rssi = src->relative_rssi;
  	params->relative_adjust_band = src->relative_adjust_band;
  	params->relative_adjust_rssi = src->relative_adjust_rssi;
  	params->p2p_include_6ghz = src->p2p_include_6ghz;
  	return params;
  
  failed:
  	wpa_scan_free_params(params);
  	return NULL;
  }
  
  
  void wpa_scan_free_params(struct wpa_driver_scan_params *params)
  {
  	size_t i;
  
  	if (params == NULL)
  		return;
  
  	for (i = 0; i < params->num_ssids; i++)
  		os_free((u8 *) params->ssids[i].ssid);
  	os_free((u8 *) params->extra_ies);
  	os_free(params->freqs);
  	os_free(params->filter_ssids);
  	os_free(params->sched_scan_plans);
  
  	/*
  	 * Note: params->mac_addr_mask points to same memory allocation and
  	 * must not be freed separately.
  	 */
  	os_free((u8 *) params->mac_addr);
  
  	os_free((u8 *) params->bssid);
  
  	os_free(params);
  }
  
  
  int wpas_start_pno(struct wpa_supplicant *wpa_s)
  {
  	int ret;
  	size_t prio, i, num_ssid, num_match_ssid;
  	struct wpa_ssid *ssid;
  	struct wpa_driver_scan_params params;
  	struct sched_scan_plan scan_plan;
  	unsigned int max_sched_scan_ssids;
  
  	if (!wpa_s->sched_scan_supported)
  		return -1;
  
  	if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS)
  		max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS;
  	else
  		max_sched_scan_ssids = wpa_s->max_sched_scan_ssids;
  	if (max_sched_scan_ssids < 1)
  		return -1;
  
  	if (wpa_s->pno || wpa_s->pno_sched_pending)
  		return 0;
  
  	if ((wpa_s->wpa_state > WPA_SCANNING) &&
  	    (wpa_s->wpa_state < WPA_COMPLETED)) {
  		wpa_printf(MSG_ERROR, "PNO: In assoc process");
  		return -EAGAIN;
  	}
  
  	if (wpa_s->wpa_state == WPA_SCANNING) {
  		wpa_supplicant_cancel_scan(wpa_s);
  		if (wpa_s->sched_scanning) {
  			wpa_printf(MSG_DEBUG, "Schedule PNO on completion of "
  				   "ongoing sched scan");
  			wpa_supplicant_cancel_sched_scan(wpa_s);
  			wpa_s->pno_sched_pending = 1;
  			return 0;
  		}
  	}
  
  	if (wpa_s->sched_scan_stop_req) {
  		wpa_printf(MSG_DEBUG,
  			   "Schedule PNO after previous sched scan has stopped");
  		wpa_s->pno_sched_pending = 1;
  		return 0;
  	}
  
  	os_memset(&params, 0, sizeof(params));
  
  	num_ssid = num_match_ssid = 0;
  	ssid = wpa_s->conf->ssid;
  	while (ssid) {
  		if (!wpas_network_disabled(wpa_s, ssid)) {
  			num_match_ssid++;
  			if (ssid->scan_ssid)
  				num_ssid++;
  		}
  		ssid = ssid->next;
  	}
  
  	if (num_match_ssid == 0) {
  		wpa_printf(MSG_DEBUG, "PNO: No configured SSIDs");
  		return -1;
  	}
  
  	if (num_match_ssid > num_ssid) {
  		params.num_ssids++; /* wildcard */
  		num_ssid++;
  	}
  
  	if (num_ssid > max_sched_scan_ssids) {
  		wpa_printf(MSG_DEBUG, "PNO: Use only the first %u SSIDs from "
  			   "%u", max_sched_scan_ssids, (unsigned int) num_ssid);
  		num_ssid = max_sched_scan_ssids;
  	}
  
  	if (num_match_ssid > wpa_s->max_match_sets) {
  		num_match_ssid = wpa_s->max_match_sets;
  		wpa_dbg(wpa_s, MSG_DEBUG, "PNO: Too many SSIDs to match");
  	}
  	params.filter_ssids = os_calloc(num_match_ssid,
  					sizeof(struct wpa_driver_scan_filter));
  	if (params.filter_ssids == NULL)
  		return -1;
  
  	i = 0;
  	prio = 0;
  	ssid = wpa_s->conf->pssid[prio];
  	while (ssid) {
  		if (!wpas_network_disabled(wpa_s, ssid)) {
  			if (ssid->scan_ssid && params.num_ssids < num_ssid) {
  				params.ssids[params.num_ssids].ssid =
  					ssid->ssid;
  				params.ssids[params.num_ssids].ssid_len =
  					 ssid->ssid_len;
  				params.num_ssids++;
  			}
  			os_memcpy(params.filter_ssids[i].ssid, ssid->ssid,
  				  ssid->ssid_len);
  			params.filter_ssids[i].ssid_len = ssid->ssid_len;
  			params.num_filter_ssids++;
  			i++;
  			if (i == num_match_ssid)
  				break;
  		}
  		if (ssid->pnext)
  			ssid = ssid->pnext;
  		else if (prio + 1 == wpa_s->conf->num_prio)
  			break;
  		else
  			ssid = wpa_s->conf->pssid[++prio];
  	}
  
  	if (wpa_s->conf->filter_rssi)
  		params.filter_rssi = wpa_s->conf->filter_rssi;
  
  	if (wpa_s->sched_scan_plans_num) {
  		params.sched_scan_plans = wpa_s->sched_scan_plans;
  		params.sched_scan_plans_num = wpa_s->sched_scan_plans_num;
  	} else {
  		/* Set one scan plan that will run infinitely */
  		if (wpa_s->conf->sched_scan_interval)
  			scan_plan.interval = wpa_s->conf->sched_scan_interval;
  		else
  			scan_plan.interval = 10;
  
  		scan_plan.iterations = 0;
  		params.sched_scan_plans = &scan_plan;
  		params.sched_scan_plans_num = 1;
  	}
  
  	params.sched_scan_start_delay = wpa_s->conf->sched_scan_start_delay;
  
  	if (params.freqs == NULL && wpa_s->manual_sched_scan_freqs) {
  		wpa_dbg(wpa_s, MSG_DEBUG, "Limit sched scan to specified channels");
  		params.freqs = wpa_s->manual_sched_scan_freqs;
  	}
  
  	if ((wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_PNO) &&
  	    wpa_s->wpa_state <= WPA_SCANNING)
  		wpa_setup_mac_addr_rand_params(&params, wpa_s->mac_addr_pno);
  
  	wpa_scan_set_relative_rssi_params(wpa_s, &params);
  
  	ret = wpa_supplicant_start_sched_scan(wpa_s, &params);
  	os_free(params.filter_ssids);
  	os_free(params.mac_addr);
  	if (ret == 0)
  		wpa_s->pno = 1;
  	else
  		wpa_msg(wpa_s, MSG_ERROR, "Failed to schedule PNO");
  	return ret;
  }
  
  
  int wpas_stop_pno(struct wpa_supplicant *wpa_s)
  {
  	int ret = 0;
  
  	if (!wpa_s->pno)
  		return 0;
  
  	ret = wpa_supplicant_stop_sched_scan(wpa_s);
  	wpa_s->sched_scan_stop_req = 1;
  
  	wpa_s->pno = 0;
  	wpa_s->pno_sched_pending = 0;
  
  	if (wpa_s->wpa_state == WPA_SCANNING)
  		wpa_supplicant_req_scan(wpa_s, 0, 0);
  
  	return ret;
  }
  
  
  void wpas_mac_addr_rand_scan_clear(struct wpa_supplicant *wpa_s,
  				    unsigned int type)
  {
  	type &= MAC_ADDR_RAND_ALL;
  	wpa_s->mac_addr_rand_enable &= ~type;
  
  	if (type & MAC_ADDR_RAND_SCAN) {
  		os_free(wpa_s->mac_addr_scan);
  		wpa_s->mac_addr_scan = NULL;
  	}
  
  	if (type & MAC_ADDR_RAND_SCHED_SCAN) {
  		os_free(wpa_s->mac_addr_sched_scan);
  		wpa_s->mac_addr_sched_scan = NULL;
  	}
  
  	if (type & MAC_ADDR_RAND_PNO) {
  		os_free(wpa_s->mac_addr_pno);
  		wpa_s->mac_addr_pno = NULL;
  	}
  }
  
  
  int wpas_mac_addr_rand_scan_set(struct wpa_supplicant *wpa_s,
  				unsigned int type, const u8 *addr,
  				const u8 *mask)
  {
  	u8 *tmp = NULL;
  
  	if ((wpa_s->mac_addr_rand_supported & type) != type ) {
  		wpa_printf(MSG_INFO,
  			   "scan: MAC randomization type %u != supported=%u",
  			   type, wpa_s->mac_addr_rand_supported);
  		return -1;
  	}
  
  	wpas_mac_addr_rand_scan_clear(wpa_s, type);
  
  	if (addr) {
  		tmp = os_malloc(2 * ETH_ALEN);
  		if (!tmp)
  			return -1;
  		os_memcpy(tmp, addr, ETH_ALEN);
  		os_memcpy(tmp + ETH_ALEN, mask, ETH_ALEN);
  	}
  
  	if (type == MAC_ADDR_RAND_SCAN) {
  		wpa_s->mac_addr_scan = tmp;
  	} else if (type == MAC_ADDR_RAND_SCHED_SCAN) {
  		wpa_s->mac_addr_sched_scan = tmp;
  	} else if (type == MAC_ADDR_RAND_PNO) {
  		wpa_s->mac_addr_pno = tmp;
  	} else {
  		wpa_printf(MSG_INFO,
  			   "scan: Invalid MAC randomization type=0x%x",
  			   type);
  		os_free(tmp);
  		return -1;
  	}
  
  	wpa_s->mac_addr_rand_enable |= type;
  	return 0;
  }
  
  
  int wpas_mac_addr_rand_scan_get_mask(struct wpa_supplicant *wpa_s,
  				     unsigned int type, u8 *mask)
  {
  	const u8 *to_copy;
  
  	if ((wpa_s->mac_addr_rand_enable & type) != type)
  		return -1;
  
  	if (type == MAC_ADDR_RAND_SCAN) {
  		to_copy = wpa_s->mac_addr_scan;
  	} else if (type == MAC_ADDR_RAND_SCHED_SCAN) {
  		to_copy = wpa_s->mac_addr_sched_scan;
  	} else if (type == MAC_ADDR_RAND_PNO) {
  		to_copy = wpa_s->mac_addr_pno;
  	} else {
  		wpa_printf(MSG_DEBUG,
  			   "scan: Invalid MAC randomization type=0x%x",
  			   type);
  		return -1;
  	}
  
  	os_memcpy(mask, to_copy + ETH_ALEN, ETH_ALEN);
  	return 0;
  }
  
  
  int wpas_abort_ongoing_scan(struct wpa_supplicant *wpa_s)
  {
  	struct wpa_radio_work *work;
  	struct wpa_radio *radio = wpa_s->radio;
  
  	dl_list_for_each(work, &radio->work, struct wpa_radio_work, list) {
  		if (work->wpa_s != wpa_s || !work->started ||
  		    (os_strcmp(work->type, "scan") != 0 &&
  		     os_strcmp(work->type, "p2p-scan") != 0))
  			continue;
  		wpa_dbg(wpa_s, MSG_DEBUG, "Abort an ongoing scan");
  		return wpa_drv_abort_scan(wpa_s, wpa_s->curr_scan_cookie);
  	}
  
  	wpa_dbg(wpa_s, MSG_DEBUG, "No ongoing scan/p2p-scan found to abort");
  	return -1;
  }
  
  
  int wpas_sched_scan_plans_set(struct wpa_supplicant *wpa_s, const char *cmd)
  {
  	struct sched_scan_plan *scan_plans = NULL;
  	const char *token, *context = NULL;
  	unsigned int num = 0;
  
  	if (!cmd)
  		return -1;
  
  	if (!cmd[0]) {
  		wpa_printf(MSG_DEBUG, "Clear sched scan plans");
  		os_free(wpa_s->sched_scan_plans);
  		wpa_s->sched_scan_plans = NULL;
  		wpa_s->sched_scan_plans_num = 0;
  		return 0;
  	}
  
  	while ((token = cstr_token(cmd, " ", &context))) {
  		int ret;
  		struct sched_scan_plan *scan_plan, *n;
  
  		n = os_realloc_array(scan_plans, num + 1, sizeof(*scan_plans));
  		if (!n)
  			goto fail;
  
  		scan_plans = n;
  		scan_plan = &scan_plans[num];
  		num++;
  
  		ret = sscanf(token, "%u:%u", &scan_plan->interval,
  			     &scan_plan->iterations);
  		if (ret <= 0 || ret > 2 || !scan_plan->interval) {
  			wpa_printf(MSG_ERROR,
  				   "Invalid sched scan plan input: %s", token);
  			goto fail;
  		}
  
  		if (scan_plan->interval > wpa_s->max_sched_scan_plan_interval) {
  			wpa_printf(MSG_WARNING,
  				   "scan plan %u: Scan interval too long(%u), use the maximum allowed(%u)",
  				   num, scan_plan->interval,
  				   wpa_s->max_sched_scan_plan_interval);
  			scan_plan->interval =
  				wpa_s->max_sched_scan_plan_interval;
  		}
  
  		if (ret == 1) {
  			scan_plan->iterations = 0;
  			break;
  		}
  
  		if (!scan_plan->iterations) {
  			wpa_printf(MSG_ERROR,
  				   "scan plan %u: Number of iterations cannot be zero",
  				   num);
  			goto fail;
  		}
  
  		if (scan_plan->iterations >
  		    wpa_s->max_sched_scan_plan_iterations) {
  			wpa_printf(MSG_WARNING,
  				   "scan plan %u: Too many iterations(%u), use the maximum allowed(%u)",
  				   num, scan_plan->iterations,
  				   wpa_s->max_sched_scan_plan_iterations);
  			scan_plan->iterations =
  				wpa_s->max_sched_scan_plan_iterations;
  		}
  
  		wpa_printf(MSG_DEBUG,
  			   "scan plan %u: interval=%u iterations=%u",
  			   num, scan_plan->interval, scan_plan->iterations);
  	}
  
  	if (!scan_plans) {
  		wpa_printf(MSG_ERROR, "Invalid scan plans entry");
  		goto fail;
  	}
  
  	if (cstr_token(cmd, " ", &context) || scan_plans[num - 1].iterations) {
  		wpa_printf(MSG_ERROR,
  			   "All scan plans but the last must specify a number of iterations");
  		goto fail;
  	}
  
  	wpa_printf(MSG_DEBUG, "scan plan %u (last plan): interval=%u",
  		   num, scan_plans[num - 1].interval);
  
  	if (num > wpa_s->max_sched_scan_plans) {
  		wpa_printf(MSG_WARNING,
  			   "Too many scheduled scan plans (only %u supported)",
  			   wpa_s->max_sched_scan_plans);
  		wpa_printf(MSG_WARNING,
  			   "Use only the first %u scan plans, and the last one (in infinite loop)",
  			   wpa_s->max_sched_scan_plans - 1);
  		os_memcpy(&scan_plans[wpa_s->max_sched_scan_plans - 1],
  			  &scan_plans[num - 1], sizeof(*scan_plans));
  		num = wpa_s->max_sched_scan_plans;
  	}
  
  	os_free(wpa_s->sched_scan_plans);
  	wpa_s->sched_scan_plans = scan_plans;
  	wpa_s->sched_scan_plans_num = num;
  
  	return 0;
  
  fail:
  	os_free(scan_plans);
  	wpa_printf(MSG_ERROR, "invalid scan plans list");
  	return -1;
  }
  
  
  /**
   * wpas_scan_reset_sched_scan - Reset sched_scan state
   * @wpa_s: Pointer to wpa_supplicant data
   *
   * This function is used to cancel a running scheduled scan and to reset an
   * internal scan state to continue with a regular scan on the following
   * wpa_supplicant_req_scan() calls.
   */
  void wpas_scan_reset_sched_scan(struct wpa_supplicant *wpa_s)
  {
  	wpa_s->normal_scans = 0;
  	if (wpa_s->sched_scanning) {
  		wpa_s->sched_scan_timed_out = 0;
  		wpa_s->prev_sched_ssid = NULL;
  		wpa_supplicant_cancel_sched_scan(wpa_s);
  	}
  }
  
  
  void wpas_scan_restart_sched_scan(struct wpa_supplicant *wpa_s)
  {
  	/* simulate timeout to restart the sched scan */
  	wpa_s->sched_scan_timed_out = 1;
  	wpa_s->prev_sched_ssid = NULL;
  	wpa_supplicant_cancel_sched_scan(wpa_s);
  }
  