text: /*
   * wpa_supplicant - Radio Measurements
   * Copyright (c) 2003-2016, Jouni Malinen <j@w1.fi>
   *
   * This software may be distributed under the terms of the BSD license.
   * See README for more details.
   */
  
  #include "includes.h"
  
  #include "utils/common.h"
  #include "utils/eloop.h"
  #include "common/ieee802_11_common.h"
  #include "wpa_supplicant_i.h"
  #include "driver_i.h"
  #include "bss.h"
  #include "scan.h"
  #include "p2p_supplicant.h"
  
  
  static void wpas_rrm_neighbor_rep_timeout_handler(void *data, void *user_ctx)
  {
  	struct rrm_data *rrm = data;
  
  	if (!rrm->notify_neighbor_rep) {
  		wpa_printf(MSG_ERROR,
  			   "RRM: Unexpected neighbor report timeout");
  		return;
  	}
  
  	wpa_printf(MSG_DEBUG, "RRM: Notifying neighbor report - NONE");
  	rrm->notify_neighbor_rep(rrm->neighbor_rep_cb_ctx, NULL);
  
  	rrm->notify_neighbor_rep = NULL;
  	rrm->neighbor_rep_cb_ctx = NULL;
  }
  
  
  /*
   * wpas_rrm_reset - Clear and reset all RRM data in wpa_supplicant
   * @wpa_s: Pointer to wpa_supplicant
   */
  void wpas_rrm_reset(struct wpa_supplicant *wpa_s)
  {
  	wpa_s->rrm.rrm_used = 0;
  
  	eloop_cancel_timeout(wpas_rrm_neighbor_rep_timeout_handler, &wpa_s->rrm,
  			     NULL);
  	if (wpa_s->rrm.notify_neighbor_rep)
  		wpas_rrm_neighbor_rep_timeout_handler(&wpa_s->rrm, NULL);
  	wpa_s->rrm.next_neighbor_rep_token = 1;
  	wpas_clear_beacon_rep_data(wpa_s);
  }
  
  
  /*
   * wpas_rrm_process_neighbor_rep - Handle incoming neighbor report
   * @wpa_s: Pointer to wpa_supplicant
   * @report: Neighbor report buffer, prefixed by a 1-byte dialog token
   * @report_len: Length of neighbor report buffer
   */
  void wpas_rrm_process_neighbor_rep(struct wpa_supplicant *wpa_s,
  				   const u8 *report, size_t report_len)
  {
  	struct wpabuf *neighbor_rep;
  
  	wpa_hexdump(MSG_DEBUG, "RRM: New Neighbor Report", report, report_len);
  	if (report_len < 1)
  		return;
  
  	if (report[0] != wpa_s->rrm.next_neighbor_rep_token - 1) {
  		wpa_printf(MSG_DEBUG,
  			   "RRM: Discarding neighbor report with token %d (expected %d)",
  			   report[0], wpa_s->rrm.next_neighbor_rep_token - 1);
  		return;
  	}
  
  	eloop_cancel_timeout(wpas_rrm_neighbor_rep_timeout_handler, &wpa_s->rrm,
  			     NULL);
  
  	if (!wpa_s->rrm.notify_neighbor_rep) {
  		wpa_printf(MSG_ERROR, "RRM: Unexpected neighbor report");
  		return;
  	}
  
  	/* skipping the first byte, which is only an id (dialog token) */
  	neighbor_rep = wpabuf_alloc(report_len - 1);
  	if (!neighbor_rep) {
  		wpas_rrm_neighbor_rep_timeout_handler(&wpa_s->rrm, NULL);
  		return;
  	}
  	wpabuf_put_data(neighbor_rep, report + 1, report_len - 1);
  	wpa_printf(MSG_DEBUG, "RRM: Notifying neighbor report (token = %d)",
  		   report[0]);
  	wpa_s->rrm.notify_neighbor_rep(wpa_s->rrm.neighbor_rep_cb_ctx,
  				       neighbor_rep);
  	wpa_s->rrm.notify_neighbor_rep = NULL;
  	wpa_s->rrm.neighbor_rep_cb_ctx = NULL;
  }
  
  
  #if defined(__CYGWIN__) || defined(CONFIG_NATIVE_WINDOWS)
  /* Workaround different, undefined for Windows, error codes used here */
  #ifndef ENOTCONN
  #define ENOTCONN -1
  #endif
  #ifndef EOPNOTSUPP
  #define EOPNOTSUPP -1
  #endif
  #ifndef ECANCELED
  #define ECANCELED -1
  #endif
  #endif
  
  /* Measurement Request element + Location Subject + Maximum Age subelement */
  #define MEASURE_REQUEST_LCI_LEN (3 + 1 + 4)
  /* Measurement Request element + Location Civic Request */
  #define MEASURE_REQUEST_CIVIC_LEN (3 + 5)
  
  
  /**
   * wpas_rrm_send_neighbor_rep_request - Request a neighbor report from our AP
   * @wpa_s: Pointer to wpa_supplicant
   * @ssid: if not null, this is sent in the request. Otherwise, no SSID IE
   *	  is sent in the request.
   * @lci: if set, neighbor request will include LCI request
   * @civic: if set, neighbor request will include civic location request
   * @cb: Callback function to be called once the requested report arrives, or
   *	timed out after RRM_NEIGHBOR_REPORT_TIMEOUT seconds.
   *	In the former case, 'neighbor_rep' is a newly allocated wpabuf, and it's
   *	the requester's responsibility to free it.
   *	In the latter case NULL will be sent in 'neighbor_rep'.
   * @cb_ctx: Context value to send the callback function
   * Returns: 0 in case of success, negative error code otherwise
   *
   * In case there is a previous request which has not been answered yet, the
   * new request fails. The caller may retry after RRM_NEIGHBOR_REPORT_TIMEOUT.
   * Request must contain a callback function.
   */
  int wpas_rrm_send_neighbor_rep_request(struct wpa_supplicant *wpa_s,
  				       const struct wpa_ssid_value *ssid,
  				       int lci, int civic,
  				       void (*cb)(void *ctx,
  						  struct wpabuf *neighbor_rep),
  				       void *cb_ctx)
  {
  	struct wpabuf *buf;
  	const u8 *rrm_ie;
  
  	if (wpa_s->wpa_state != WPA_COMPLETED || wpa_s->current_ssid == NULL) {
  		wpa_printf(MSG_DEBUG, "RRM: No connection, no RRM.");
  		return -ENOTCONN;
  	}
  
  	if (!wpa_s->rrm.rrm_used) {
  		wpa_printf(MSG_DEBUG, "RRM: No RRM in current connection.");
  		return -EOPNOTSUPP;
  	}
  
  	rrm_ie = wpa_bss_get_ie(wpa_s->current_bss,
  				WLAN_EID_RRM_ENABLED_CAPABILITIES);
  	if (!rrm_ie || !(wpa_s->current_bss->caps & IEEE80211_CAP_RRM) ||
  	    !(rrm_ie[2] & WLAN_RRM_CAPS_NEIGHBOR_REPORT)) {
  		wpa_printf(MSG_DEBUG,
  			   "RRM: No network support for Neighbor Report.");
  		return -EOPNOTSUPP;
  	}
  
  	/* Refuse if there's a live request */
  	if (wpa_s->rrm.notify_neighbor_rep) {
  		wpa_printf(MSG_DEBUG,
  			   "RRM: Currently handling previous Neighbor Report.");
  		return -EBUSY;
  	}
  
  	/* 3 = action category + action code + dialog token */
  	buf = wpabuf_alloc(3 + (ssid ? 2 + ssid->ssid_len : 0) +
  			   (lci ? 2 + MEASURE_REQUEST_LCI_LEN : 0) +
  			   (civic ? 2 + MEASURE_REQUEST_CIVIC_LEN : 0));
  	if (buf == NULL) {
  		wpa_printf(MSG_DEBUG,
  			   "RRM: Failed to allocate Neighbor Report Request");
  		return -ENOMEM;
  	}
  
  	wpa_printf(MSG_DEBUG, "RRM: Neighbor report request (for %s), token=%d",
  		   (ssid ? wpa_ssid_txt(ssid->ssid, ssid->ssid_len) : ""),
  		   wpa_s->rrm.next_neighbor_rep_token);
  
  	wpabuf_put_u8(buf, WLAN_ACTION_RADIO_MEASUREMENT);
  	wpabuf_put_u8(buf, WLAN_RRM_NEIGHBOR_REPORT_REQUEST);
  	wpabuf_put_u8(buf, wpa_s->rrm.next_neighbor_rep_token);
  	if (ssid) {
  		wpabuf_put_u8(buf, WLAN_EID_SSID);
  		wpabuf_put_u8(buf, ssid->ssid_len);
  		wpabuf_put_data(buf, ssid->ssid, ssid->ssid_len);
  	}
  
  	if (lci) {
  		/* IEEE P802.11-REVmc/D5.0 9.4.2.21 */
  		wpabuf_put_u8(buf, WLAN_EID_MEASURE_REQUEST);
  		wpabuf_put_u8(buf, MEASURE_REQUEST_LCI_LEN);
  
  		/*
  		 * Measurement token; nonzero number that is unique among the
  		 * Measurement Request elements in a particular frame.
  		 */
  		wpabuf_put_u8(buf, 1); /* Measurement Token */
  
  		/*
  		 * Parallel, Enable, Request, and Report bits are 0, Duration is
  		 * reserved.
  		 */
  		wpabuf_put_u8(buf, 0); /* Measurement Request Mode */
  		wpabuf_put_u8(buf, MEASURE_TYPE_LCI); /* Measurement Type */
  
  		/* IEEE P802.11-REVmc/D5.0 9.4.2.21.10 - LCI request */
  		/* Location Subject */
  		wpabuf_put_u8(buf, LOCATION_SUBJECT_REMOTE);
  
  		/* Optional Subelements */
  		/*
  		 * IEEE P802.11-REVmc/D5.0 Figure 9-170
  		 * The Maximum Age subelement is required, otherwise the AP can
  		 * send only data that was determined after receiving the
  		 * request. Setting it here to unlimited age.
  		 */
  		wpabuf_put_u8(buf, LCI_REQ_SUBELEM_MAX_AGE);
  		wpabuf_put_u8(buf, 2);
  		wpabuf_put_le16(buf, 0xffff);
  	}
  
  	if (civic) {
  		/* IEEE P802.11-REVmc/D5.0 9.4.2.21 */
  		wpabuf_put_u8(buf, WLAN_EID_MEASURE_REQUEST);
  		wpabuf_put_u8(buf, MEASURE_REQUEST_CIVIC_LEN);
  
  		/*
  		 * Measurement token; nonzero number that is unique among the
  		 * Measurement Request elements in a particular frame.
  		 */
  		wpabuf_put_u8(buf, 2); /* Measurement Token */
  
  		/*
  		 * Parallel, Enable, Request, and Report bits are 0, Duration is
  		 * reserved.
  		 */
  		wpabuf_put_u8(buf, 0); /* Measurement Request Mode */
  		/* Measurement Type */
  		wpabuf_put_u8(buf, MEASURE_TYPE_LOCATION_CIVIC);
  
  		/* IEEE P802.11-REVmc/D5.0 9.4.2.21.14:
  		 * Location Civic request */
  		/* Location Subject */
  		wpabuf_put_u8(buf, LOCATION_SUBJECT_REMOTE);
  		wpabuf_put_u8(buf, 0); /* Civic Location Type: IETF RFC 4776 */
  		/* Location Service Interval Units: Seconds */
  		wpabuf_put_u8(buf, 0);
  		/* Location Service Interval: 0 - Only one report is requested
  		 */
  		wpabuf_put_le16(buf, 0);
  		/* No optional subelements */
  	}
  
  	wpa_s->rrm.next_neighbor_rep_token++;
  
  	if (wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid,
  				wpa_s->own_addr, wpa_s->bssid,
  				wpabuf_head(buf), wpabuf_len(buf), 0) < 0) {
  		wpa_printf(MSG_DEBUG,
  			   "RRM: Failed to send Neighbor Report Request");
  		wpabuf_free(buf);
  		return -ECANCELED;
  	}
  
  	wpa_s->rrm.neighbor_rep_cb_ctx = cb_ctx;
  	wpa_s->rrm.notify_neighbor_rep = cb;
  	eloop_register_timeout(RRM_NEIGHBOR_REPORT_TIMEOUT, 0,
  			       wpas_rrm_neighbor_rep_timeout_handler,
  			       &wpa_s->rrm, NULL);
  
  	wpabuf_free(buf);
  	return 0;
  }
  
  
  static int wpas_rrm_report_elem(struct wpabuf **buf, u8 token, u8 mode, u8 type,
  				const u8 *data, size_t data_len)
  {
  	if (wpabuf_resize(buf, 5 + data_len))
  		return -1;
  
  	wpabuf_put_u8(*buf, WLAN_EID_MEASURE_REPORT);
  	wpabuf_put_u8(*buf, 3 + data_len);
  	wpabuf_put_u8(*buf, token);
  	wpabuf_put_u8(*buf, mode);
  	wpabuf_put_u8(*buf, type);
  
  	if (data_len)
  		wpabuf_put_data(*buf, data, data_len);
  
  	return 0;
  }
  
  
  static int
  wpas_rrm_build_lci_report(struct wpa_supplicant *wpa_s,
  			  const struct rrm_measurement_request_element *req,
  			  struct wpabuf **buf)
  {
  	u8 subject;
  	u16 max_age = 0;
  	struct os_reltime t, diff;
  	unsigned long diff_l;
  	const u8 *subelem;
  	const u8 *request = req->variable;
  	size_t len = req->len - 3;
  
  	if (len < 1)
  		return -1;
  
  	if (!wpa_s->lci)
  		goto reject;
  
  	subject = *request++;
  	len--;
  
  	wpa_printf(MSG_DEBUG, "Measurement request location subject=%u",
  		   subject);
  
  	if (subject != LOCATION_SUBJECT_REMOTE) {
  		wpa_printf(MSG_INFO,
  			   "Not building LCI report - bad location subject");
  		return 0;
  	}
  
  	/* Subelements are formatted exactly like elements */
  	wpa_hexdump(MSG_DEBUG, "LCI request subelements", request, len);
  	subelem = get_ie(request, len, LCI_REQ_SUBELEM_MAX_AGE);
  	if (subelem && subelem[1] == 2)
  		max_age = WPA_GET_LE16(subelem + 2);
  
  	if (os_get_reltime(&t))
  		goto reject;
  
  	os_reltime_sub(&t, &wpa_s->lci_time, &diff);
  	/* LCI age is calculated in 10th of a second units. */
  	diff_l = diff.sec * 10 + diff.usec / 100000;
  
  	if (max_age != 0xffff && max_age < diff_l)
  		goto reject;
  
  	if (wpas_rrm_report_elem(buf, req->token,
  				 MEASUREMENT_REPORT_MODE_ACCEPT, req->type,
  				 wpabuf_head_u8(wpa_s->lci),
  				 wpabuf_len(wpa_s->lci)) < 0) {
  		wpa_printf(MSG_DEBUG, "Failed to add LCI report element");
  		return -1;
  	}
  
  	return 0;
  
  reject:
  	if (!is_multicast_ether_addr(wpa_s->rrm.dst_addr) &&
  	    wpas_rrm_report_elem(buf, req->token,
  				 MEASUREMENT_REPORT_MODE_REJECT_INCAPABLE,
  				 req->type, NULL, 0) < 0) {
  		wpa_printf(MSG_DEBUG, "RRM: Failed to add report element");
  		return -1;
  	}
  
  	return 0;
  }
  
  
  static void wpas_rrm_send_msr_report_mpdu(struct wpa_supplicant *wpa_s,
  					  const u8 *data, size_t len)
  {
  	struct wpabuf *report = wpabuf_alloc(len + 3);
  
  	if (!report)
  		return;
  
  	wpabuf_put_u8(report, WLAN_ACTION_RADIO_MEASUREMENT);
  	wpabuf_put_u8(report, WLAN_RRM_RADIO_MEASUREMENT_REPORT);
  	wpabuf_put_u8(report, wpa_s->rrm.token);
  
  	wpabuf_put_data(report, data, len);
  
  	if (wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid,
  				wpa_s->own_addr, wpa_s->bssid,
  				wpabuf_head(report), wpabuf_len(report), 0)) {
  		wpa_printf(MSG_ERROR,
  			   "RRM: Radio measurement report failed: Sending Action frame failed");
  	}
  
  	wpabuf_free(report);
  }
  
  
  static int wpas_rrm_beacon_rep_update_last_frame(u8 *pos, size_t len)
  {
  	struct rrm_measurement_report_element *msr_rep;
  	u8 *end = pos + len;
  	u8 *msr_rep_end;
  	struct rrm_measurement_beacon_report *rep = NULL;
  	u8 *subelem;
  
  	/* Find the last beacon report element */
  	while (end - pos >= (int) sizeof(*msr_rep)) {
  		msr_rep = (struct rrm_measurement_report_element *) pos;
  		msr_rep_end = pos + msr_rep->len + 2;
  
  		if (msr_rep->eid != WLAN_EID_MEASURE_REPORT ||
  		    msr_rep_end > end) {
  			/* Should not happen. This indicates a bug. */
  			wpa_printf(MSG_ERROR,
  				   "RRM: non-measurement report element in measurement report frame");
  			return -1;
  		}
  
  		if (msr_rep->type == MEASURE_TYPE_BEACON)
  			rep = (struct rrm_measurement_beacon_report *)
  				msr_rep->variable;
  
  		pos += pos[1] + 2;
  	}
  
  	if (!rep)
  		return 0;
  
  	subelem = rep->variable;
  	while (subelem + 2 < msr_rep_end &&
  	       subelem[0] != WLAN_BEACON_REPORT_SUBELEM_LAST_INDICATION)
  		subelem += 2 + subelem[1];
  
  	if (subelem + 2 < msr_rep_end &&
  	    subelem[0] == WLAN_BEACON_REPORT_SUBELEM_LAST_INDICATION &&
  	    subelem[1] == 1 &&
  	    subelem + BEACON_REPORT_LAST_INDICATION_SUBELEM_LEN <= end)
  		subelem[2] = 1;
  
  	return 0;
  }
  
  
  static void wpas_rrm_send_msr_report(struct wpa_supplicant *wpa_s,
  				     struct wpabuf *buf)
  {
  	int len = wpabuf_len(buf);
  	u8 *pos = wpabuf_mhead_u8(buf), *next = pos;
  
  #define MPDU_REPORT_LEN (int) (IEEE80211_MAX_MMPDU_SIZE - IEEE80211_HDRLEN - 3)
  
  	while (len) {
  		int send_len = (len > MPDU_REPORT_LEN) ? next - pos : len;
  
  		if (send_len == len)
  			wpas_rrm_beacon_rep_update_last_frame(pos, len);
  
  		if (send_len == len ||
  		    (send_len + next[1] + 2) > MPDU_REPORT_LEN) {
  			wpas_rrm_send_msr_report_mpdu(wpa_s, pos, send_len);
  			len -= send_len;
  			pos = next;
  		}
  
  		if (len)
  			next += next[1] + 2;
  	}
  #undef MPDU_REPORT_LEN
  }
  
  
  static int wpas_add_channel(u8 op_class, u8 chan, u8 num_primary_channels,
  			    int *freqs)
  {
  	size_t i;
  
  	for (i = 0; i < num_primary_channels; i++) {
  		u8 primary_chan = chan - (2 * num_primary_channels - 2) + i * 4;
  
  		freqs[i] = ieee80211_chan_to_freq(NULL, op_class, primary_chan);
  		/* ieee80211_chan_to_freq() is not really meant for this
  		 * conversion of 20 MHz primary channel numbers for wider VHT
  		 * channels, so handle those as special cases here for now. */
  		if (freqs[i] < 0 &&
  		    (op_class == 128 || op_class == 129 || op_class == 130))
  			freqs[i] = 5000 + 5 * primary_chan;
  		if (freqs[i] < 0) {
  			wpa_printf(MSG_DEBUG,
  				   "Beacon Report: Invalid channel %u",
  				   chan);
  			return -1;
  		}
  	}
  
  	return 0;
  }
  
  
  static int * wpas_add_channels(const struct oper_class_map *op,
  			       struct hostapd_hw_modes *mode, int active,
  			       const u8 *channels, const u8 size)
  {
  	int *freqs, *next_freq;
  	u8 num_primary_channels, i;
  	u8 num_chans;
  
  	num_chans = channels ? size :
  		(op->max_chan - op->min_chan) / op->inc + 1;
  
  	if (op->bw == BW80 || op->bw == BW80P80)
  		num_primary_channels = 4;
  	else if (op->bw == BW160)
  		num_primary_channels = 8;
  	else
  		num_primary_channels = 1;
  
  	/* one extra place for the zero-terminator */
  	freqs = os_calloc(num_chans * num_primary_channels + 1, sizeof(*freqs));
  	if (!freqs) {
  		wpa_printf(MSG_ERROR,
  			   "Beacon Report: Failed to allocate freqs array");
  		return NULL;
  	}
  
  	next_freq = freqs;
  	for  (i = 0; i < num_chans; i++) {
  		u8 chan = channels ? channels[i] : op->min_chan + i * op->inc;
  		enum chan_allowed res = verify_channel(mode, op->op_class, chan,
  						       op->bw);
  
  		if (res == NOT_ALLOWED || (res == NO_IR && active))
  			continue;
  
  		if (wpas_add_channel(op->op_class, chan, num_primary_channels,
  				     next_freq) < 0) {
  			os_free(freqs);
  			return NULL;
  		}
  
  		next_freq += num_primary_channels;
  	}
  
  	if (!freqs[0]) {
  		os_free(freqs);
  		return NULL;
  	}
  
  	return freqs;
  }
  
  
  static int * wpas_op_class_freqs(const struct oper_class_map *op,
  				 struct hostapd_hw_modes *mode, int active)
  {
  	u8 channels_80mhz[] = { 42, 58, 106, 122, 138, 155 };
  	u8 channels_160mhz[] = { 50, 114 };
  
  	/*
  	 * When adding all channels in the operating class, 80 + 80 MHz
  	 * operating classes are like 80 MHz channels because we add all valid
  	 * channels anyway.
  	 */
  	if (op->bw == BW80 || op->bw == BW80P80)
  		return wpas_add_channels(op, mode, active, channels_80mhz,
  					 ARRAY_SIZE(channels_80mhz));
  
  	if (op->bw == BW160)
  		return wpas_add_channels(op, mode, active, channels_160mhz,
  					 ARRAY_SIZE(channels_160mhz));
  
  	return wpas_add_channels(op, mode, active, NULL, 0);
  }
  
  
  static int * wpas_channel_report_freqs(struct wpa_supplicant *wpa_s, int active,
  				       const char *country, const u8 *subelems,
  				       size_t len)
  {
  	int *freqs = NULL, *new_freqs;
  	const u8 *end = subelems + len;
  
  	while (end - subelems > 2) {
  		const struct oper_class_map *op;
  		const u8 *ap_chan_elem, *pos;
  		u8 left;
  		struct hostapd_hw_modes *mode;
  
  		ap_chan_elem = get_ie(subelems, end - subelems,
  				      WLAN_BEACON_REQUEST_SUBELEM_AP_CHANNEL);
  		if (!ap_chan_elem)
  			break;
  		pos = ap_chan_elem + 2;
  		left = ap_chan_elem[1];
  		if (left < 1)
  			break;
  		subelems = ap_chan_elem + 2 + left;
  
  		op = get_oper_class(country, *pos);
  		if (!op) {
  			wpa_printf(MSG_DEBUG,
  				   "Beacon request: unknown operating class in AP Channel Report subelement %u",
  				   *pos);
  			goto out;
  		}
  		pos++;
  		left--;
  
  		mode = get_mode(wpa_s->hw.modes, wpa_s->hw.num_modes, op->mode);
  		if (!mode)
  			continue;
  
  		/*
  		 * For 80 + 80 MHz operating classes, this AP Channel Report
  		 * element should be followed by another element specifying
  		 * the second 80 MHz channel. For now just add this 80 MHz
  		 * channel, the second 80 MHz channel will be added when the
  		 * next element is parsed.
  		 * TODO: Verify that this AP Channel Report element is followed
  		 * by a corresponding AP Channel Report element as specified in
  		 * IEEE Std 802.11-2016, 11.11.9.1.
  		 */
  		new_freqs = wpas_add_channels(op, mode, active, pos, left);
  		if (new_freqs)
  			int_array_concat(&freqs, new_freqs);
  
  		os_free(new_freqs);
  	}
  
  	return freqs;
  out:
  	os_free(freqs);
  	return NULL;
  }
  
  
  static int * wpas_beacon_request_freqs(struct wpa_supplicant *wpa_s,
  				       u8 op_class, u8 chan, int active,
  				       const u8 *subelems, size_t len)
  {
  	int *freqs = NULL, *ext_freqs = NULL;
  	struct hostapd_hw_modes *mode;
  	const char *country = NULL;
  	const struct oper_class_map *op;
  	const u8 *elem;
  
  	if (!wpa_s->current_bss)
  		return NULL;
  	elem = wpa_bss_get_ie(wpa_s->current_bss, WLAN_EID_COUNTRY);
  	if (elem && elem[1] >= 2)
  		country = (const char *) (elem + 2);
  
  	op = get_oper_class(country, op_class);
  	if (!op) {
  		wpa_printf(MSG_DEBUG,
  			   "Beacon request: invalid operating class %d",
  			   op_class);
  		return NULL;
  	}
  
  	mode = get_mode(wpa_s->hw.modes, wpa_s->hw.num_modes, op->mode);
  	if (!mode)
  		return NULL;
  
  	switch (chan) {
  	case 0:
  		freqs = wpas_op_class_freqs(op, mode, active);
  		if (!freqs)
  			return NULL;
  		break;
  	case 255:
  		/* freqs will be added from AP channel subelements */
  		break;
  	default:
  		freqs = wpas_add_channels(op, mode, active, &chan, 1);
  		if (!freqs)
  			return NULL;
  		break;
  	}
  
  	ext_freqs = wpas_channel_report_freqs(wpa_s, active, country, subelems,
  					      len);
  	if (ext_freqs) {
  		int_array_concat(&freqs, ext_freqs);
  		os_free(ext_freqs);
  		int_array_sort_unique(freqs);
  	}
  
  	return freqs;
  }
  
  
  static int wpas_get_op_chan_phy(int freq, const u8 *ies, size_t ies_len,
  				u8 *op_class, u8 *chan, u8 *phy_type)
  {
  	const u8 *ie;
  	int sec_chan = 0, vht = 0;
  	struct ieee80211_ht_operation *ht_oper = NULL;
  	struct ieee80211_vht_operation *vht_oper = NULL;
  	u8 seg0, seg1;
  
  	ie = get_ie(ies, ies_len, WLAN_EID_HT_OPERATION);
  	if (ie && ie[1] >= sizeof(struct ieee80211_ht_operation)) {
  		u8 sec_chan_offset;
  
  		ht_oper = (struct ieee80211_ht_operation *) (ie + 2);
  		sec_chan_offset = ht_oper->ht_param &
  			HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK;
  		if (sec_chan_offset == HT_INFO_HT_PARAM_SECONDARY_CHNL_ABOVE)
  			sec_chan = 1;
  		else if (sec_chan_offset ==
  			 HT_INFO_HT_PARAM_SECONDARY_CHNL_BELOW)
  			sec_chan = -1;
  	}
  
  	ie = get_ie(ies, ies_len, WLAN_EID_VHT_OPERATION);
  	if (ie && ie[1] >= sizeof(struct ieee80211_vht_operation)) {
  		vht_oper = (struct ieee80211_vht_operation *) (ie + 2);
  
  		switch (vht_oper->vht_op_info_chwidth) {
  		case 1:
  			seg0 = vht_oper->vht_op_info_chan_center_freq_seg0_idx;
  			seg1 = vht_oper->vht_op_info_chan_center_freq_seg1_idx;
  			if (seg1 && abs(seg1 - seg0) == 8)
  				vht = CHANWIDTH_160MHZ;
  			else if (seg1)
  				vht = CHANWIDTH_80P80MHZ;
  			else
  				vht = CHANWIDTH_80MHZ;
  			break;
  		case 2:
  			vht = CHANWIDTH_160MHZ;
  			break;
  		case 3:
  			vht = CHANWIDTH_80P80MHZ;
  			break;
  		default:
  			vht = CHANWIDTH_USE_HT;
  			break;
  		}
  	}
  
  	if (ieee80211_freq_to_channel_ext(freq, sec_chan, vht, op_class,
  					  chan) == NUM_HOSTAPD_MODES) {
  		wpa_printf(MSG_DEBUG,
  			   "Cannot determine operating class and channel");
  		return -1;
  	}
  
  	*phy_type = ieee80211_get_phy_type(freq, ht_oper != NULL,
  					   vht_oper != NULL);
  	if (*phy_type == PHY_TYPE_UNSPECIFIED) {
  		wpa_printf(MSG_DEBUG, "Cannot determine phy type");
  		return -1;
  	}
  
  	return 0;
  }
  
  
  static int wpas_beacon_rep_add_frame_body(struct bitfield *eids,
  					  enum beacon_report_detail detail,
  					  struct wpa_bss *bss, u8 *buf,
  					  size_t buf_len, u8 **ies_buf,
  					  size_t *ie_len, int add_fixed)
  {
  	u8 *ies = *ies_buf;
  	size_t ies_len = *ie_len;
  	u8 *pos = buf;
  	int rem_len;
  
  	rem_len = 255 - sizeof(struct rrm_measurement_beacon_report) -
  		sizeof(struct rrm_measurement_report_element) - 2 -
  		REPORTED_FRAME_BODY_SUBELEM_LEN;
  
  	if (detail > BEACON_REPORT_DETAIL_ALL_FIELDS_AND_ELEMENTS) {
  		wpa_printf(MSG_DEBUG,
  			   "Beacon Request: Invalid reporting detail: %d",
  			   detail);
  		return -1;
  	}
  
  	if (detail == BEACON_REPORT_DETAIL_NONE)
  		return 0;
  
  	/*
  	 * Minimal frame body subelement size: EID(1) + length(1) + TSF(8) +
  	 * beacon interval(2) + capabilities(2) = 14 bytes
  	 */
  	if (add_fixed && buf_len < 14)
  		return -1;
  
  	*pos++ = WLAN_BEACON_REPORT_SUBELEM_FRAME_BODY;
  	/* The length will be filled later */
  	pos++;
  
  	if (add_fixed) {
  		WPA_PUT_LE64(pos, bss->tsf);
  		pos += sizeof(bss->tsf);
  		WPA_PUT_LE16(pos, bss->beacon_int);
  		pos += 2;
  		WPA_PUT_LE16(pos, bss->caps);
  		pos += 2;
  	}
  
  	rem_len -= pos - buf;
  
  	/*
  	 * According to IEEE Std 802.11-2016, 9.4.2.22.7, if the reported frame
  	 * body subelement causes the element to exceed the maximum element
  	 * size, the subelement is truncated so that the last IE is a complete
  	 * IE. So even when required to report all IEs, add elements one after
  	 * the other and stop once there is no more room in the measurement
  	 * element.
  	 */
  	while (ies_len > 2 && 2U + ies[1] <= ies_len && rem_len > 0) {
  		if (detail == BEACON_REPORT_DETAIL_ALL_FIELDS_AND_ELEMENTS ||
  		    (eids && bitfield_is_set(eids, ies[0]))) {
  			u8 elen = ies[1];
  
  			if (2 + elen > buf + buf_len - pos ||
  			    2 + elen > rem_len)
  				break;
  
  			*pos++ = ies[0];
  			*pos++ = elen;
  			os_memcpy(pos, ies + 2, elen);
  			pos += elen;
  			rem_len -= 2 + elen;
  		}
  
  		ies_len -= 2 + ies[1];
  		ies += 2 + ies[1];
  	}
  
  	*ie_len = ies_len;
  	*ies_buf = ies;
  
  	/* Now the length is known */
  	buf[1] = pos - buf - 2;
  	return pos - buf;
  }
  
  
  static int wpas_add_beacon_rep_elem(struct beacon_rep_data *data,
  				    struct wpa_bss *bss,
  				    struct wpabuf **wpa_buf,
  				    struct rrm_measurement_beacon_report *rep,
  				    u8 **ie, size_t *ie_len, u8 idx)
  {
  	int ret;
  	u8 *buf, *pos;
  	u32 subelems_len = REPORTED_FRAME_BODY_SUBELEM_LEN +
  		(data->last_indication ?
  		 BEACON_REPORT_LAST_INDICATION_SUBELEM_LEN : 0);
  
  	/* Maximum element length: Beacon Report element + Reported Frame Body
  	 * subelement + all IEs of the reported Beacon frame + Reported Frame
  	 * Body Fragment ID subelement */
  	buf = os_malloc(sizeof(*rep) + 14 + *ie_len + subelems_len);
  	if (!buf)
  		return -1;
  
  	os_memcpy(buf, rep, sizeof(*rep));
  
  	ret = wpas_beacon_rep_add_frame_body(data->eids, data->report_detail,
  					     bss, buf + sizeof(*rep),
  					     14 + *ie_len, ie, ie_len,
  					     idx == 0);
  	if (ret < 0)
  		goto out;
  
  	pos = buf + ret + sizeof(*rep);
  	pos[0] = WLAN_BEACON_REPORT_SUBELEM_FRAME_BODY_FRAGMENT_ID;
  	pos[1] = 2;
  
  	/*
  	 * Only one Beacon Report Measurement is supported at a time, so
  	 * the Beacon Report ID can always be set to 1.
  	 */
  	pos[2] = 1;
  
  	/* Fragment ID Number (bits 0..6) and More Frame Body Fragments (bit 7)
   */
  	pos[3] = idx;
  	if (data->report_detail != BEACON_REPORT_DETAIL_NONE && *ie_len)
  		pos[3] |= REPORTED_FRAME_BODY_MORE_FRAGMENTS;
  	else
  		pos[3] &= ~REPORTED_FRAME_BODY_MORE_FRAGMENTS;
  
  	pos += REPORTED_FRAME_BODY_SUBELEM_LEN;
  
  	if (data->last_indication) {
  		pos[0] = WLAN_BEACON_REPORT_SUBELEM_LAST_INDICATION;
  		pos[1] = 1;
  
  		/* This field will be updated later if this is the last frame */
  		pos[2] = 0;
  	}
  
  	ret = wpas_rrm_report_elem(wpa_buf, data->token,
  				   MEASUREMENT_REPORT_MODE_ACCEPT,
  				   MEASURE_TYPE_BEACON, buf,
  				   ret + sizeof(*rep) + subelems_len);
  out:
  	os_free(buf);
  	return ret;
  }
  
  
  static int wpas_add_beacon_rep(struct wpa_supplicant *wpa_s,
  			       struct wpabuf **wpa_buf, struct wpa_bss *bss,
  			       u64 start, u64 parent_tsf)
  {
  	struct beacon_rep_data *data = &wpa_s->beacon_rep_data;
  	u8 *ies = (u8 *) (bss + 1);
  	u8 *pos = ies;
  	size_t ies_len = bss->ie_len ? bss->ie_len : bss->beacon_ie_len;
  	struct rrm_measurement_beacon_report rep;
  	u8 idx = 0;
  
  	if (os_memcmp(data->bssid, broadcast_ether_addr, ETH_ALEN) != 0 &&
  	    os_memcmp(data->bssid, bss->bssid, ETH_ALEN) != 0)
  		return 0;
  
  	if (data->ssid_len &&
  	    (data->ssid_len != bss->ssid_len ||
  	     os_memcmp(data->ssid, bss->ssid, bss->ssid_len) != 0))
  		return 0;
  
  	if (wpas_get_op_chan_phy(bss->freq, ies, ies_len, &rep.op_class,
  				 &rep.channel, &rep.report_info) < 0)
  		return 0;
  
  	rep.start_time = host_to_le64(start);
  	rep.duration = host_to_le16(data->scan_params.duration);
  	rep.rcpi = rssi_to_rcpi(bss->level);
  	rep.rsni = 255; /* 255 indicates that RSNI is not available */
  	os_memcpy(rep.bssid, bss->bssid, ETH_ALEN);
  	rep.antenna_id = 0; /* unknown */
  	rep.parent_tsf = host_to_le32(parent_tsf);
  
  	do {
  		int ret;
  
  		ret = wpas_add_beacon_rep_elem(data, bss, wpa_buf, &rep,
  					       &pos, &ies_len, idx++);
  		if (ret)
  			return ret;
  	} while (data->report_detail != BEACON_REPORT_DETAIL_NONE &&
  		 ies_len >= 2);
  
  	return 0;
  }
  
  
  static int wpas_beacon_rep_no_results(struct wpa_supplicant *wpa_s,
  				      struct wpabuf **buf)
  {
  	return wpas_rrm_report_elem(buf, wpa_s->beacon_rep_data.token,
  				    MEASUREMENT_REPORT_MODE_ACCEPT,
  				    MEASURE_TYPE_BEACON, NULL, 0);
  }
  
  
  static void wpas_beacon_rep_table(struct wpa_supplicant *wpa_s,
  				  struct wpabuf **buf)
  {
  	size_t i;
  
  	for (i = 0; i < wpa_s->last_scan_res_used; i++) {
  		if (wpas_add_beacon_rep(wpa_s, buf, wpa_s->last_scan_res[i],
  					0, 0) < 0)
  			break;
  	}
  
  	if (!(*buf))
  		wpas_beacon_rep_no_results(wpa_s, buf);
  
  	wpa_hexdump_buf(MSG_DEBUG, "RRM: Radio Measurement report", *buf);
  }
  
  
  void wpas_rrm_refuse_request(struct wpa_supplicant *wpa_s)
  {
  	if (!is_multicast_ether_addr(wpa_s->rrm.dst_addr)) {
  		struct wpabuf *buf = NULL;
  
  		if (wpas_rrm_report_elem(&buf, wpa_s->beacon_rep_data.token,
  					 MEASUREMENT_REPORT_MODE_REJECT_REFUSED,
  					 MEASURE_TYPE_BEACON, NULL, 0)) {
  			wpa_printf(MSG_ERROR, "RRM: Memory allocation failed");
  			wpabuf_free(buf);
  			return;
  		}
  
  		wpas_rrm_send_msr_report(wpa_s, buf);
  		wpabuf_free(buf);
  	}
  
  	wpas_clear_beacon_rep_data(wpa_s);
  }
  
  
  static void wpas_rrm_scan_timeout(void *eloop_ctx, void *timeout_ctx)
  {
  	struct wpa_supplicant *wpa_s = eloop_ctx;
  	struct wpa_driver_scan_params *params =
  		&wpa_s->beacon_rep_data.scan_params;
  	u16 prev_duration = params->duration;
  
  	if (!wpa_s->current_bss)
  		return;
  
  	if (!(wpa_s->drv_rrm_flags & WPA_DRIVER_FLAGS_SUPPORT_SET_SCAN_DWELL) &&
  	    params->duration) {
  		wpa_printf(MSG_DEBUG,
  			   "RRM: Cannot set scan duration due to missing driver support");
  		params->duration = 0;
  	}
  	os_get_reltime(&wpa_s->beacon_rep_scan);
  	if (wpa_s->scanning || wpas_p2p_in_progress(wpa_s) ||
  	    wpa_supplicant_trigger_scan(wpa_s, params))
  		wpas_rrm_refuse_request(wpa_s);
  	params->duration = prev_duration;
  }
  
  
  static int wpas_rm_handle_beacon_req_subelem(struct wpa_supplicant *wpa_s,
  					     struct beacon_rep_data *data,
  					     u8 sid, u8 slen, const u8 *subelem)
  {
  	u8 report_info, i;
  
  	switch (sid) {
  	case WLAN_BEACON_REQUEST_SUBELEM_SSID:
  		if (!slen) {
  			wpa_printf(MSG_DEBUG,
  				   "SSID subelement with zero length - wildcard SSID");
  			break;
  		}
  
  		if (slen > SSID_MAX_LEN) {
  			wpa_printf(MSG_DEBUG,
  				   "Invalid SSID subelement length: %u", slen);
  			return -1;
  		}
  
  		data->ssid_len = slen;
  		os_memcpy(data->ssid, subelem, data->ssid_len);
  		break;
  	case WLAN_BEACON_REQUEST_SUBELEM_INFO:
  		if (slen != 2) {
  			wpa_printf(MSG_DEBUG,
  				   "Invalid reporting information subelement length: %u",
  				   slen);
  			return -1;
  		}
  
  		report_info = subelem[0];
  		if (report_info != 0) {
  			wpa_printf(MSG_DEBUG,
  				   "reporting information=%u is not supported",
  				   report_info);
  			return 0;
  		}
  		break;
  	case WLAN_BEACON_REQUEST_SUBELEM_DETAIL:
  		if (slen != 1) {
  			wpa_printf(MSG_DEBUG,
  				   "Invalid reporting detail subelement length: %u",
  				   slen);
  			return -1;
  		}
  
  		data->report_detail = subelem[0];
  		if (data->report_detail >
  		    BEACON_REPORT_DETAIL_ALL_FIELDS_AND_ELEMENTS) {
  			wpa_printf(MSG_DEBUG, "Invalid reporting detail: %u",
  				   subelem[0]);
  			return -1;
  		}
  
  		break;
  	case WLAN_BEACON_REQUEST_SUBELEM_REQUEST:
  		if (data->report_detail !=
  		    BEACON_REPORT_DETAIL_REQUESTED_ONLY) {
  			wpa_printf(MSG_DEBUG,
  				   "Beacon request: request subelement is present but report detail is %u",
  				   data->report_detail);
  			return -1;
  		}
  
  		if (!slen) {
  			wpa_printf(MSG_DEBUG,
  				   "Invalid request subelement length: %u",
  				   slen);
  			return -1;
  		}
  
  		if (data->eids) {
  			wpa_printf(MSG_DEBUG,
  				   "Beacon Request: Request subelement appears more than once");
  			return -1;
  		}
  
  		data->eids = bitfield_alloc(255);
  		if (!data->eids) {
  			wpa_printf(MSG_DEBUG, "Failed to allocate EIDs bitmap");
  			return -1;
  		}
  
  		for (i = 0; i < slen; i++)
  			bitfield_set(data->eids, subelem[i]);
  		break;
  	case WLAN_BEACON_REQUEST_SUBELEM_AP_CHANNEL:
  		/* Skip - it will be processed when freqs are added */
  		break;
  	case WLAN_BEACON_REQUEST_SUBELEM_LAST_INDICATION:
  		if (slen != 1) {
  			wpa_printf(MSG_DEBUG,
  				   "Beacon request: Invalid last indication request subelement length: %u",
  				   slen);
  			return -1;
  		}
  
  		data->last_indication = subelem[0];
  		break;
  	default:
  		wpa_printf(MSG_DEBUG,
  			   "Beacon request: Unknown subelement id %u", sid);
  		break;
  	}
  
  	return 1;
  }
  
  
  /**
   * Returns 0 if the next element can be processed, 1 if some operation was
   * triggered, and -1 if processing failed (i.e., the element is in invalid
   * format or an internal error occurred).
   */
  static int
  wpas_rm_handle_beacon_req(struct wpa_supplicant *wpa_s,
  			  u8 elem_token, int duration_mandatory,
  			  const struct rrm_measurement_beacon_request *req,
  			  size_t len, struct wpabuf **buf)
  {
  	struct beacon_rep_data *data = &wpa_s->beacon_rep_data;
  	struct wpa_driver_scan_params *params = &data->scan_params;
  	const u8 *subelems;
  	size_t elems_len;
  	u16 rand_interval;
  	u32 interval_usec;
  	u32 _rand;
  	int ret = 0, res;
  	u8 reject_mode;
  
  	if (len < sizeof(*req))
  		return -1;
  
  	if (req->mode != BEACON_REPORT_MODE_PASSIVE &&
  	    req->mode != BEACON_REPORT_MODE_ACTIVE &&
  	    req->mode != BEACON_REPORT_MODE_TABLE)
  		return 0;
  
  	subelems = req->variable;
  	elems_len = len - sizeof(*req);
  	rand_interval = le_to_host16(req->rand_interval);
  
  	os_free(params->freqs);
  	os_memset(params, 0, sizeof(*params));
  
  	data->token = elem_token;
  
  	/* default reporting detail is all fixed length fields and all
  	 * elements */
  	data->report_detail = BEACON_REPORT_DETAIL_ALL_FIELDS_AND_ELEMENTS;
  	os_memcpy(data->bssid, req->bssid, ETH_ALEN);
  
  	while (elems_len >= 2) {
  		if (subelems[1] > elems_len - 2) {
  			wpa_printf(MSG_DEBUG,
  				   "Beacon Request: Truncated subelement");
  			ret = -1;
  			goto out;
  		}
  
  		res = wpas_rm_handle_beacon_req_subelem(
  			wpa_s, data, subelems[0], subelems[1], &subelems[2]);
  		if (res < 0) {
  			ret = res;
  			goto out;
  		} else if (!res) {
  			reject_mode = MEASUREMENT_REPORT_MODE_REJECT_INCAPABLE;
  			goto out_reject;
  		}
  
  		elems_len -= 2 + subelems[1];
  		subelems += 2 + subelems[1];
  	}
  
  	if (req->mode == BEACON_REPORT_MODE_TABLE) {
  		wpas_beacon_rep_table(wpa_s, buf);
  		goto out;
  	}
  
  	params->freqs = wpas_beacon_request_freqs(
  		wpa_s, req->oper_class, req->channel,
  		req->mode == BEACON_REPORT_MODE_ACTIVE,
  		req->variable, len - sizeof(*req));
  	if (!params->freqs) {
  		wpa_printf(MSG_DEBUG, "Beacon request: No valid channels");
  		reject_mode = MEASUREMENT_REPORT_MODE_REJECT_REFUSED;
  		goto out_reject;
  	}
  
  	params->duration = le_to_host16(req->duration);
  	params->duration_mandatory = duration_mandatory;
  	if (!params->duration) {
  		wpa_printf(MSG_DEBUG, "Beacon request: Duration is 0");
  		ret = -1;
  		goto out;
  	}
  
  	params->only_new_results = 1;
  
  	if (req->mode == BEACON_REPORT_MODE_ACTIVE) {
  		params->ssids[params->num_ssids].ssid = data->ssid;
  		params->ssids[params->num_ssids++].ssid_len = data->ssid_len;
  	}
  
  	if (os_get_random((u8 *) &_rand, sizeof(_rand)) < 0)
  		_rand = os_random();
  	interval_usec = (_rand % (rand_interval + 1)) * 1024;
  	eloop_register_timeout(0, interval_usec, wpas_rrm_scan_timeout, wpa_s,
  			       NULL);
  	return 1;
  out_reject:
  	if (!is_multicast_ether_addr(wpa_s->rrm.dst_addr) &&
  	    wpas_rrm_report_elem(buf, elem_token, reject_mode,
  				 MEASURE_TYPE_BEACON, NULL, 0) < 0) {
  		wpa_printf(MSG_DEBUG, "RRM: Failed to add report element");
  		ret = -1;
  	}
  out:
  	wpas_clear_beacon_rep_data(wpa_s);
  	return ret;
  }
  
  
  static int
  wpas_rrm_handle_msr_req_element(
  	struct wpa_supplicant *wpa_s,
  	const struct rrm_measurement_request_element *req,
  	struct wpabuf **buf)
  {
  	int duration_mandatory;
  
  	wpa_printf(MSG_DEBUG, "Measurement request type %d token %d",
  		   req->type, req->token);
  
  	if (req->mode & MEASUREMENT_REQUEST_MODE_ENABLE) {
  		/* Enable bit is not supported for now */
  		wpa_printf(MSG_DEBUG, "RRM: Enable bit not supported, ignore");
  		return 0;
  	}
  
  	if ((req->mode & MEASUREMENT_REQUEST_MODE_PARALLEL) &&
  	    req->type > MEASURE_TYPE_RPI_HIST) {
  		/* Parallel measurements are not supported for now */
  		wpa_printf(MSG_DEBUG,
  			   "RRM: Parallel measurements are not supported, reject");
  		goto reject;
  	}
  
  	duration_mandatory =
  		!!(req->mode & MEASUREMENT_REQUEST_MODE_DURATION_MANDATORY);
  
  	switch (req->type) {
  	case MEASURE_TYPE_LCI:
  		return wpas_rrm_build_lci_report(wpa_s, req, buf);
  	case MEASURE_TYPE_BEACON:
  		if (duration_mandatory &&
  		    !(wpa_s->drv_rrm_flags &
  		      WPA_DRIVER_FLAGS_SUPPORT_SET_SCAN_DWELL)) {
  			wpa_printf(MSG_DEBUG,
  				   "RRM: Driver does not support dwell time configuration - reject beacon report with mandatory duration");
  			goto reject;
  		}
  		return wpas_rm_handle_beacon_req(wpa_s, req->token,
  						 duration_mandatory,
  						 (const void *) req->variable,
  						 req->len - 3, buf);
  	default:
  		wpa_printf(MSG_INFO,
  			   "RRM: Unsupported radio measurement type %u",
  			   req->type);
  		break;
  	}
  
  reject:
  	if (!is_multicast_ether_addr(wpa_s->rrm.dst_addr) &&
  	    wpas_rrm_report_elem(buf, req->token,
  				 MEASUREMENT_REPORT_MODE_REJECT_INCAPABLE,
  				 req->type, NULL, 0) < 0) {
  		wpa_printf(MSG_DEBUG, "RRM: Failed to add report element");
  		return -1;
  	}
  
  	return 0;
  }
  
  
  static struct wpabuf *
  wpas_rrm_process_msr_req_elems(struct wpa_supplicant *wpa_s, const u8 *pos,
  			       size_t len)
  {
  	struct wpabuf *buf = NULL;
  
  	while (len) {
  		const struct rrm_measurement_request_element *req;
  		int res;
  
  		if (len < 2) {
  			wpa_printf(MSG_DEBUG, "RRM: Truncated element");
  			goto out;
  		}
  
  		req = (const struct rrm_measurement_request_element *) pos;
  		if (req->eid != WLAN_EID_MEASURE_REQUEST) {
  			wpa_printf(MSG_DEBUG,
  				   "RRM: Expected Measurement Request element, but EID is %u",
  				   req->eid);
  			goto out;
  		}
  
  		if (req->len < 3) {
  			wpa_printf(MSG_DEBUG, "RRM: Element length too short");
  			goto out;
  		}
  
  		if (req->len > len - 2) {
  			wpa_printf(MSG_DEBUG, "RRM: Element length too long");
  			goto out;
  		}
  
  		res = wpas_rrm_handle_msr_req_element(wpa_s, req, &buf);
  		if (res < 0)
  			goto out;
  
  		pos += req->len + 2;
  		len -= req->len + 2;
  	}
  
  	return buf;
  
  out:
  	wpabuf_free(buf);
  	return NULL;
  }
  
  
  void wpas_rrm_handle_radio_measurement_request(struct wpa_supplicant *wpa_s,
  					       const u8 *src, const u8 *dst,
  					       const u8 *frame, size_t len)
  {
  	struct wpabuf *report;
  
  	if (wpa_s->wpa_state != WPA_COMPLETED) {
  		wpa_printf(MSG_INFO,
  			   "RRM: Ignoring radio measurement request: Not associated");
  		return;
  	}
  
  	if (!wpa_s->rrm.rrm_used) {
  		wpa_printf(MSG_INFO,
  			   "RRM: Ignoring radio measurement request: Not RRM network");
  		return;
  	}
  
  	if (len < 3) {
  		wpa_printf(MSG_INFO,
  			   "RRM: Ignoring too short radio measurement request");
  		return;
  	}
  
  	wpa_s->rrm.token = *frame;
  	os_memcpy(wpa_s->rrm.dst_addr, dst, ETH_ALEN);
  
  	/* Number of repetitions is not supported */
  
  	report = wpas_rrm_process_msr_req_elems(wpa_s, frame + 3, len - 3);
  	if (!report)
  		return;
  
  	wpas_rrm_send_msr_report(wpa_s, report);
  	wpabuf_free(report);
  }
  
  
  void wpas_rrm_handle_link_measurement_request(struct wpa_supplicant *wpa_s,
  					      const u8 *src,
  					      const u8 *frame, size_t len,
  					      int rssi)
  {
  	struct wpabuf *buf;
  	const struct rrm_link_measurement_request *req;
  	struct rrm_link_measurement_report report;
  
  	if (wpa_s->wpa_state != WPA_COMPLETED) {
  		wpa_printf(MSG_INFO,
  			   "RRM: Ignoring link measurement request. Not associated");
  		return;
  	}
  
  	if (!wpa_s->rrm.rrm_used) {
  		wpa_printf(MSG_INFO,
  			   "RRM: Ignoring link measurement request. Not RRM network");
  		return;
  	}
  
  	if (!(wpa_s->drv_rrm_flags & WPA_DRIVER_FLAGS_TX_POWER_INSERTION)) {
  		wpa_printf(MSG_INFO,
  			   "RRM: Measurement report failed. TX power insertion not supported");
  		return;
  	}
  
  	req = (const struct rrm_link_measurement_request *) frame;
  	if (len < sizeof(*req)) {
  		wpa_printf(MSG_INFO,
  			   "RRM: Link measurement report failed. Request too short");
  		return;
  	}
  
  	os_memset(&report, 0, sizeof(report));
  	report.dialog_token = req->dialog_token;
  	report.tpc.eid = WLAN_EID_TPC_REPORT;
  	report.tpc.len = 2;
  	/* Note: The driver is expected to update report.tpc.tx_power and
  	 * report.tpc.link_margin subfields when sending out this frame.
  	 * Similarly, the driver would need to update report.rx_ant_id and
  	 * report.tx_ant_id subfields. */
  	report.rsni = 255; /* 255 indicates that RSNI is not available */
  	report.rcpi = rssi_to_rcpi(rssi);
  
  	/* action_category + action_code */
  	buf = wpabuf_alloc(2 + sizeof(report));
  	if (buf == NULL) {
  		wpa_printf(MSG_ERROR,
  			   "RRM: Link measurement report failed. Buffer allocation failed");
  		return;
  	}
  
  	wpabuf_put_u8(buf, WLAN_ACTION_RADIO_MEASUREMENT);
  	wpabuf_put_u8(buf, WLAN_RRM_LINK_MEASUREMENT_REPORT);
  	wpabuf_put_data(buf, &report, sizeof(report));
  	wpa_hexdump_buf(MSG_DEBUG, "RRM: Link measurement report", buf);
  
  	if (wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, src,
  				wpa_s->own_addr, wpa_s->bssid,
  				wpabuf_head(buf), wpabuf_len(buf), 0)) {
  		wpa_printf(MSG_ERROR,
  			   "RRM: Link measurement report failed. Send action failed");
  	}
  	wpabuf_free(buf);
  }
  
  
  int wpas_beacon_rep_scan_process(struct wpa_supplicant *wpa_s,
  				 struct wpa_scan_results *scan_res,
  				 struct scan_info *info)
  {
  	size_t i = 0;
  	struct wpabuf *buf = NULL;
  
  	if (!wpa_s->beacon_rep_data.token)
  		return 0;
  
  	if (!wpa_s->current_bss)
  		goto out;
  
  	/* If the measurement was aborted, don't report partial results */
  	if (info->aborted)
  		goto out;
  
  	wpa_printf(MSG_DEBUG, "RRM: TSF BSSID: " MACSTR " current BSS: " MACSTR,
  		   MAC2STR(info->scan_start_tsf_bssid),
  		   MAC2STR(wpa_s->current_bss->bssid));
  	if ((wpa_s->drv_rrm_flags & WPA_DRIVER_FLAGS_SUPPORT_BEACON_REPORT) &&
  	    os_memcmp(info->scan_start_tsf_bssid, wpa_s->current_bss->bssid,
  		      ETH_ALEN) != 0) {
  		wpa_printf(MSG_DEBUG,
  			   "RRM: Ignore scan results due to mismatching TSF BSSID");
  		goto out;
  	}
  
  	for (i = 0; i < scan_res->num; i++) {
  		struct wpa_bss *bss =
  			wpa_bss_get_bssid(wpa_s, scan_res->res[i]->bssid);
  
  		if (!bss)
  			continue;
  
  		if ((wpa_s->drv_rrm_flags &
  		     WPA_DRIVER_FLAGS_SUPPORT_BEACON_REPORT) &&
  		    os_memcmp(scan_res->res[i]->tsf_bssid,
  			      wpa_s->current_bss->bssid, ETH_ALEN) != 0) {
  			wpa_printf(MSG_DEBUG,
  				   "RRM: Ignore scan result for " MACSTR
  				   " due to mismatching TSF BSSID" MACSTR,
  				   MAC2STR(scan_res->res[i]->bssid),
  				   MAC2STR(scan_res->res[i]->tsf_bssid));
  			continue;
  		}
  
  		/*
  		 * Don't report results that were not received during the
  		 * current measurement.
  		 */
  		if (!(wpa_s->drv_rrm_flags &
  		      WPA_DRIVER_FLAGS_SUPPORT_BEACON_REPORT)) {
  			struct os_reltime update_time, diff;
  
  			/* For now, allow 8 ms older results due to some
  			 * unknown issue with cfg80211 BSS table updates during
  			 * a scan with the current BSS.
  			 * TODO: Fix this more properly to avoid having to have
  			 * this type of hacks in place. */
  			calculate_update_time(&scan_res->fetch_time,
  					      scan_res->res[i]->age,
  					      &update_time);
  			os_reltime_sub(&wpa_s->beacon_rep_scan,
  				       &update_time, &diff);
  			if (os_reltime_before(&update_time,
  					      &wpa_s->beacon_rep_scan) &&
  			    (diff.sec || diff.usec >= 8000)) {
  				wpa_printf(MSG_DEBUG,
  					   "RRM: Ignore scan result for " MACSTR
  					   " due to old update (age(ms) %u, calculated age %u.%06u seconds)",
  					   MAC2STR(scan_res->res[i]->bssid),
  					   scan_res->res[i]->age,
  					   (unsigned int) diff.sec,
  					   (unsigned int) diff.usec);
  				continue;
  			}
  		} else if (info->scan_start_tsf >
  			   scan_res->res[i]->parent_tsf) {
  			continue;
  		}
  
  		if (wpas_add_beacon_rep(wpa_s, &buf, bss, info->scan_start_tsf,
  					scan_res->res[i]->parent_tsf) < 0)
  			break;
  	}
  
  	if (!buf && wpas_beacon_rep_no_results(wpa_s, &buf))
  		goto out;
  
  	wpa_hexdump_buf(MSG_DEBUG, "RRM: Radio Measurement report", buf);
  
  	wpas_rrm_send_msr_report(wpa_s, buf);
  	wpabuf_free(buf);
  
  out:
  	wpas_clear_beacon_rep_data(wpa_s);
  	return 1;
  }
  
  
  void wpas_clear_beacon_rep_data(struct wpa_supplicant *wpa_s)
  {
  	struct beacon_rep_data *data = &wpa_s->beacon_rep_data;
  
  	eloop_cancel_timeout(wpas_rrm_scan_timeout, wpa_s, NULL);
  	bitfield_free(data->eids);
  	os_free(data->scan_params.freqs);
  	os_memset(data, 0, sizeof(*data));
  }
  