/src/hostap/wpa_supplicant/rrm.c

Source
/*
 * 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_msg(wpa_s, MSG_INFO, "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_dbg(wpa_s, 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_dbg(wpa_s, MSG_DEBUG, "RRM: No connection, no RRM.");
    return -ENOTCONN;
  }

  if (!wpa_s->rrm.rrm_used) {
    wpa_dbg(wpa_s, 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[1] < 1 ||
      !(rrm_ie[2] & WLAN_RRM_CAPS_NEIGHBOR_REPORT)) {
    wpa_dbg(wpa_s, 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_dbg(wpa_s, 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_dbg(wpa_s, MSG_DEBUG,
      "RRM: Failed to allocate Neighbor Report Request");
    return -ENOMEM;
  }

  wpa_dbg(wpa_s, 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);

  /*
   * According to IEEE Std 802.11-2024, 11.10.10.2 (Requesting a neighbor
   * report) LCI and civic requests depend on FTM responder support.
   */
  if (lci || civic) {
    const u8 *ext_capab;

    ext_capab = wpa_bss_get_ie(wpa_s->current_bss,
             WLAN_EID_EXT_CAPAB);
    if (!ieee802_11_ext_capab(ext_capab,
            WLAN_EXT_CAPAB_FTM_RESPONDER)) {
      wpa_printf(MSG_DEBUG,
           "AP doesn't support FTM responder, can't request LCI and civic");
      lci = 0;
      civic = 0;
    }
  }

  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 && rrm_ie[1] >= 2 &&
      (rrm_ie[3] & WLAN_RRM_CAPS_LCI_MEASUREMENT)) {
    /* IEEE Std 802.11-2024, 9.4.2.19 (Measurement Request element)
     */
    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 Std 802.11-2024, 9.4.2.19.10 (LCI request) */
    /* Location Subject */
    wpabuf_put_u8(buf, LOCATION_SUBJECT_REMOTE);

    /* Optional Subelements */
    /*
     * IEEE Std 802.11-2024, Figure 9-265 (Maximum Age subelement
     * format)
     * 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);
  } else if (lci) {
    wpa_printf(MSG_DEBUG, "RRM: LCI request isn't supported by AP");
  }

  if (civic && rrm_ie[1] >= 5 &&
      (rrm_ie[6] & WLAN_RRM_CAPS_CIVIC_LOCATION_MEASUREMENT)) {
    /* IEEE Std 802.11-2024, 9.4.2.19 (Measurement Request element)
     */
    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 Std 802.11-2024, 9.4.2.19.14 (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 */
  } else if (civic) {
    wpa_printf(MSG_DEBUG,
         "RRM: Civic request isn't supported by AP");
  }

  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_dbg(wpa_s, 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,
             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 if (op->bw == BW320)
    num_primary_channels = 16;
  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)
      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)
{
  u8 channels_80mhz_5ghz[] = { 42, 58, 106, 122, 138, 155, 171 };
  u8 channels_160mhz_5ghz[] = { 50, 114, 163 };
  u8 channels_80mhz_6ghz[] = { 7, 23, 39, 55, 71, 87, 103, 119, 135, 151,
             167, 183, 199, 215 };
  u8 channels_160mhz_6ghz[] = { 15, 47, 79, 111, 143, 175, 207 };
  u8 channels_320mhz_6ghz[] = { 31, 63, 95, 127, 159, 191 };
  const u8 *channels = NULL;
  size_t num_chan = 0;
  bool is_6ghz = is_6ghz_op_class(op->op_class);

  /*
   * 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) {
    channels = is_6ghz ? channels_80mhz_6ghz : channels_80mhz_5ghz;
    num_chan = is_6ghz ? ARRAY_SIZE(channels_80mhz_6ghz) :
      ARRAY_SIZE(channels_80mhz_5ghz);
  } else if (op->bw == BW160) {
    channels = is_6ghz ? channels_160mhz_6ghz :
      channels_160mhz_5ghz;
    num_chan =  is_6ghz ? ARRAY_SIZE(channels_160mhz_6ghz) :
      ARRAY_SIZE(channels_160mhz_5ghz);
  } else if (op->bw == BW320) {
    channels = channels_320mhz_6ghz;
    num_chan = ARRAY_SIZE(channels_320mhz_6ghz);
  }

  return wpas_add_channels(op, mode, channels, num_chan);
}


static int * wpas_channel_report_freqs(struct wpa_supplicant *wpa_s,
               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,
        is_6ghz_op_class(op->op_class));
    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, 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,
               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,
      is_6ghz_op_class(op->op_class));
  if (!mode)
    return NULL;

  switch (chan) {
  case 0:
    freqs = wpas_op_class_freqs(op, mode);
    if (!freqs)
      return NULL;
    break;
  case 255:
    /* freqs will be added from AP channel subelements */
    break;
  default:
    freqs = wpas_add_channels(op, mode, &chan, 1);
    if (!freqs)
      return NULL;
    break;
  }

  ext_freqs = wpas_channel_report_freqs(wpa_s, country, subelems, len);
  if (ext_freqs) {
    int_array_concat(&freqs, ext_freqs);
    os_free(ext_freqs);
    int_array_sort_unique(freqs);
  }

  return freqs;
}


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 CHANWIDTH_80MHZ:
      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 = CONF_OPER_CHWIDTH_160MHZ;
      else if (seg1)
        vht = CONF_OPER_CHWIDTH_80P80MHZ;
      else
        vht = CONF_OPER_CHWIDTH_80MHZ;
      break;
    case CHANWIDTH_160MHZ:
      vht = CONF_OPER_CHWIDTH_160MHZ;
      break;
    case CHANWIDTH_80P80MHZ:
      vht = CONF_OPER_CHWIDTH_80P80MHZ;
      break;
    default:
      vht = CONF_OPER_CHWIDTH_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,
            struct bitfield *ext_eids,
            enum beacon_report_detail detail,
            struct wpa_bss *bss, u8 *buf,
            size_t buf_len, const u8 **ies_buf,
            size_t *ie_len, int add_fixed)
{
  const 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])) ||
        (ext_eids && ies[0] == WLAN_EID_EXTENSION && ies[1] &&
         bitfield_is_set(ext_eids, ies[2]))) {
      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,
            const 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->ext_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;
  const u8 *ies = wpa_bss_ie_ptr(bss);
  const 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 (!ether_addr_equal(data->bssid, broadcast_ether_addr) &&
      !ether_addr_equal(data->bssid, bss->bssid))
    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, true, false))
    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)
{
  struct bitfield *eids;
  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:
  case WLAN_BEACON_REQUEST_SUBELEM_EXT_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 (sid == WLAN_BEACON_REQUEST_SUBELEM_EXT_REQUEST) {
      if (slen < 2) {
        wpa_printf(MSG_DEBUG,
             "Invalid extended request");
        return -1;
      }
      if (subelem[0] != WLAN_EID_EXTENSION) {
        wpa_printf(MSG_DEBUG,
             "Skip unknown Requested Element ID %u in Extended Request subelement",
             subelem[0]);
        break;
      }

      /* Skip the Requested Element ID field */
      subelem++;
      slen--;
    }

    if ((sid == WLAN_BEACON_REQUEST_SUBELEM_REQUEST &&
         data->eids) ||
        (sid == WLAN_BEACON_REQUEST_SUBELEM_EXT_REQUEST &&
        data->ext_eids)) {
      wpa_printf(MSG_DEBUG,
           "Beacon Request: Request sub elements appear more than once");
      return -1;
    }

    eids = bitfield_alloc(255);
    if (!eids) {
      wpa_printf(MSG_DEBUG, "Failed to allocate EIDs bitmap");
      return -1;
    }

    if (sid == WLAN_BEACON_REQUEST_SUBELEM_REQUEST)
      data->eids = eids;
    else
      data->ext_eids = eids;

    for (i = 0; i < slen; i++)
      bitfield_set(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->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);
}


static bool wpas_beacon_rep_scan_match(struct wpa_supplicant *wpa_s,
               const u8 *bssid)
{
  u8 i;

  if (!wpa_s->valid_links)
    return ether_addr_equal(wpa_s->current_bss->bssid, bssid);

  for_each_link(wpa_s->valid_links, i) {
    if (ether_addr_equal(wpa_s->links[i].bssid, bssid))
      return true;
  }

  wpa_printf(MSG_DEBUG, "RRM: MLD: no match for TSF BSSID=" MACSTR,
       MAC2STR(bssid));

  return false;
}


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_refuse;

  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) &&
      !wpas_beacon_rep_scan_match(wpa_s, info->scan_start_tsf_bssid)) {
    wpa_printf(MSG_DEBUG,
         "RRM: Ignore scan results due to mismatching TSF BSSID");
    goto out_refuse;
  }

  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) &&
        !wpas_beacon_rep_scan_match(wpa_s,
            scan_res->res[i]->tsf_bssid)) {
      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);

  goto out;

out_refuse:
  wpas_rrm_refuse_request(wpa_s);
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);
  bitfield_free(data->ext_eids);
  os_free(data->scan_params.freqs);
  os_memset(data, 0, sizeof(*data));
}

Coverage Report

Created: 2025-10-10 06:31