net/mac80211/scan.c

   1 /*
   2  * Scanning implementation
   3  *
   4  * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
   5  * Copyright 2004, Instant802 Networks, Inc.
   6  * Copyright 2005, Devicescape Software, Inc.
   7  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   8  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
   9  * Copyright 2013-2015  Intel Mobile Communications GmbH
  10  * Copyright 2016  Intel Deutschland GmbH
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License version 2 as
  14  * published by the Free Software Foundation.
  15  */
  16
  17 #include <linux/if_arp.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/rtnetlink.h>
  20 #include <net/sch_generic.h>
  21 #include <linux/slab.h>
  22 #include <linux/export.h>
  23 #include <net/mac80211.h>
  24
  25 #include "ieee80211_i.h"
  26 #include "driver-ops.h"
  27 #include "mesh.h"
  28
  29 #define IEEE80211_PROBE_DELAY (HZ / 33)
  30 #define IEEE80211_CHANNEL_TIME (HZ / 33)
  31 #define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 9)
  32
  33 void ieee80211_rx_bss_put(struct ieee80211_local *local,
  34                           struct ieee80211_bss *bss)
  35 {
  36         if (!bss)
  37                 return;
  38         cfg80211_put_bss(local->hw.wiphy,
  39                          container_of((void *)bss, struct cfg80211_bss, priv));
  40 }
  41
  42 static bool is_uapsd_supported(struct ieee802_11_elems *elems)
  43 {
  44         u8 qos_info;
  45
  46         if (elems->wmm_info && elems->wmm_info_len == 7
  47             && elems->wmm_info[5] == 1)
  48                 qos_info = elems->wmm_info[6];
  49         else if (elems->wmm_param && elems->wmm_param_len == 24
  50                  && elems->wmm_param[5] == 1)
  51                 qos_info = elems->wmm_param[6];
  52         else
  53                 /* no valid wmm information or parameter element found */
  54                 return false;
  55
  56         return qos_info & IEEE80211_WMM_IE_AP_QOSINFO_UAPSD;
  57 }
  58
  59 struct ieee80211_bss *
  60 ieee80211_bss_info_update(struct ieee80211_local *local,
  61                           struct ieee80211_rx_status *rx_status,
  62                           struct ieee80211_mgmt *mgmt, size_t len,
  63                           struct ieee802_11_elems *elems,
  64                           struct ieee80211_channel *channel)
  65 {
  66         bool beacon = ieee80211_is_beacon(mgmt->frame_control);
  67         struct cfg80211_bss *cbss;
  68         struct ieee80211_bss *bss;
  69         int clen, srlen;
  70         struct cfg80211_inform_bss bss_meta = {
  71                 .boottime_ns = rx_status->boottime_ns,
  72         };
  73         bool signal_valid;
  74         struct ieee80211_sub_if_data *scan_sdata;
  75
  76         if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
  77                 bss_meta.signal = rx_status->signal * 100;
  78         else if (ieee80211_hw_check(&local->hw, SIGNAL_UNSPEC))
  79                 bss_meta.signal = (rx_status->signal * 100) / local->hw.max_signal;
  80
  81         bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_20;
  82         if (rx_status->flag & RX_FLAG_5MHZ)
  83                 bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_5;
  84         if (rx_status->flag & RX_FLAG_10MHZ)
  85                 bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_10;
  86
  87         bss_meta.chan = channel;
  88
  89         rcu_read_lock();
  90         scan_sdata = rcu_dereference(local->scan_sdata);
  91         if (scan_sdata && scan_sdata->vif.type == NL80211_IFTYPE_STATION &&
  92             scan_sdata->vif.bss_conf.assoc &&
  93             ieee80211_have_rx_timestamp(rx_status)) {
  94                 bss_meta.parent_tsf =
  95                         ieee80211_calculate_rx_timestamp(local, rx_status,
  96                                                          len + FCS_LEN, 24);
  97                 ether_addr_copy(bss_meta.parent_bssid,
  98                                 scan_sdata->vif.bss_conf.bssid);
  99         }
 100         rcu_read_unlock();
 101
 102         cbss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta,
 103                                               mgmt, len, GFP_ATOMIC);
 104         if (!cbss)
 105                 return NULL;
 106         /* In case the signal is invalid update the status */
 107         signal_valid = abs(channel->center_freq - cbss->channel->center_freq)
 108                 <= local->hw.wiphy->max_adj_channel_rssi_comp;
 109         if (!signal_valid)
 110                 rx_status->flag |= RX_FLAG_NO_SIGNAL_VAL;
 111
 112         bss = (void *)cbss->priv;
 113
 114         if (beacon)
 115                 bss->device_ts_beacon = rx_status->device_timestamp;
 116         else
 117                 bss->device_ts_presp = rx_status->device_timestamp;
 118
 119         if (elems->parse_error) {
 120                 if (beacon)
 121                         bss->corrupt_data |= IEEE80211_BSS_CORRUPT_BEACON;
 122                 else
 123                         bss->corrupt_data |= IEEE80211_BSS_CORRUPT_PROBE_RESP;
 124         } else {
 125                 if (beacon)
 126                         bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_BEACON;
 127                 else
 128                         bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_PROBE_RESP;
 129         }
 130
 131         /* save the ERP value so that it is available at association time */
 132         if (elems->erp_info && (!elems->parse_error ||
 133                                 !(bss->valid_data & IEEE80211_BSS_VALID_ERP))) {
 134                 bss->erp_value = elems->erp_info[0];
 135                 bss->has_erp_value = true;
 136                 if (!elems->parse_error)
 137                         bss->valid_data |= IEEE80211_BSS_VALID_ERP;
 138         }
 139
 140         /* replace old supported rates if we get new values */
 141         if (!elems->parse_error ||
 142             !(bss->valid_data & IEEE80211_BSS_VALID_RATES)) {
 143                 srlen = 0;
 144                 if (elems->supp_rates) {
 145                         clen = IEEE80211_MAX_SUPP_RATES;
 146                         if (clen > elems->supp_rates_len)
 147                                 clen = elems->supp_rates_len;
 148                         memcpy(bss->supp_rates, elems->supp_rates, clen);
 149                         srlen += clen;
 150                 }
 151                 if (elems->ext_supp_rates) {
 152                         clen = IEEE80211_MAX_SUPP_RATES - srlen;
 153                         if (clen > elems->ext_supp_rates_len)
 154                                 clen = elems->ext_supp_rates_len;
 155                         memcpy(bss->supp_rates + srlen, elems->ext_supp_rates,
 156                                clen);
 157                         srlen += clen;
 158                 }
 159                 if (srlen) {
 160                         bss->supp_rates_len = srlen;
 161                         if (!elems->parse_error)
 162                                 bss->valid_data |= IEEE80211_BSS_VALID_RATES;
 163                 }
 164         }
 165
 166         if (!elems->parse_error ||
 167             !(bss->valid_data & IEEE80211_BSS_VALID_WMM)) {
 168                 bss->wmm_used = elems->wmm_param || elems->wmm_info;
 169                 bss->uapsd_supported = is_uapsd_supported(elems);
 170                 if (!elems->parse_error)
 171                         bss->valid_data |= IEEE80211_BSS_VALID_WMM;
 172         }
 173
 174         if (beacon) {
 175                 struct ieee80211_supported_band *sband =
 176                         local->hw.wiphy->bands[rx_status->band];
 177                 if (!(rx_status->flag & RX_FLAG_HT) &&
 178                     !(rx_status->flag & RX_FLAG_VHT))
 179                         bss->beacon_rate =
 180                                 &sband->bitrates[rx_status->rate_idx];
 181         }
 182
 183         return bss;
 184 }
 185
 186 void ieee80211_scan_rx(struct ieee80211_local *local, struct sk_buff *skb)
 187 {
 188         struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
 189         struct ieee80211_sub_if_data *sdata1, *sdata2;
 190         struct ieee80211_mgmt *mgmt = (void *)skb->data;
 191         struct ieee80211_bss *bss;
 192         u8 *elements;
 193         struct ieee80211_channel *channel;
 194         size_t baselen;
 195         struct ieee802_11_elems elems;
 196
 197         if (skb->len < 24 ||
 198             (!ieee80211_is_probe_resp(mgmt->frame_control) &&
 199              !ieee80211_is_beacon(mgmt->frame_control)))
 200                 return;
 201
 202         sdata1 = rcu_dereference(local->scan_sdata);
 203         sdata2 = rcu_dereference(local->sched_scan_sdata);
 204
 205         if (likely(!sdata1 && !sdata2))
 206                 return;
 207
 208         if (ieee80211_is_probe_resp(mgmt->frame_control)) {
 209                 struct cfg80211_scan_request *scan_req;
 210                 struct cfg80211_sched_scan_request *sched_scan_req;
 211
 212                 scan_req = rcu_dereference(local->scan_req);
 213                 sched_scan_req = rcu_dereference(local->sched_scan_req);
 214
 215                 /* ignore ProbeResp to foreign address unless scanning
 216                  * with randomised address
 217                  */
 218                 if (!(sdata1 &&
 219                       (ether_addr_equal(mgmt->da, sdata1->vif.addr) ||
 220                        scan_req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR)) &&
 221                     !(sdata2 &&
 222                       (ether_addr_equal(mgmt->da, sdata2->vif.addr) ||
 223                        sched_scan_req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR)))
 224                         return;
 225
 226                 elements = mgmt->u.probe_resp.variable;
 227                 baselen = offsetof(struct ieee80211_mgmt, u.probe_resp.variable);
 228         } else {
 229                 baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable);
 230                 elements = mgmt->u.beacon.variable;
 231         }
 232
 233         if (baselen > skb->len)
 234                 return;
 235
 236         ieee802_11_parse_elems(elements, skb->len - baselen, false, &elems);
 237
 238         channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
 239
 240         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
 241                 return;
 242
 243         bss = ieee80211_bss_info_update(local, rx_status,
 244                                         mgmt, skb->len, &elems,
 245                                         channel);
 246         if (bss)
 247                 ieee80211_rx_bss_put(local, bss);
 248 }
 249
 250 static void
 251 ieee80211_prepare_scan_chandef(struct cfg80211_chan_def *chandef,
 252                                enum nl80211_bss_scan_width scan_width)
 253 {
 254         memset(chandef, 0, sizeof(*chandef));
 255         switch (scan_width) {
 256         case NL80211_BSS_CHAN_WIDTH_5:
 257                 chandef->width = NL80211_CHAN_WIDTH_5;
 258                 break;
 259         case NL80211_BSS_CHAN_WIDTH_10:
 260                 chandef->width = NL80211_CHAN_WIDTH_10;
 261                 break;
 262         default:
 263                 chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
 264                 break;
 265         }
 266 }
 267
 268 /* return false if no more work */
 269 static bool ieee80211_prep_hw_scan(struct ieee80211_local *local)
 270 {
 271         struct cfg80211_scan_request *req;
 272         struct cfg80211_chan_def chandef;
 273         u8 bands_used = 0;
 274         int i, ielen, n_chans;
 275
 276         req = rcu_dereference_protected(local->scan_req,
 277                                         lockdep_is_held(&local->mtx));
 278
 279         if (test_bit(SCAN_HW_CANCELLED, &local->scanning))
 280                 return false;
 281
 282         if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) {
 283                 for (i = 0; i < req->n_channels; i++) {
 284                         local->hw_scan_req->req.channels[i] = req->channels[i];
 285                         bands_used |= BIT(req->channels[i]->band);
 286                 }
 287
 288                 n_chans = req->n_channels;
 289         } else {
 290                 do {
 291                         if (local->hw_scan_band == NUM_NL80211_BANDS)
 292                                 return false;
 293
 294                         n_chans = 0;
 295
 296                         for (i = 0; i < req->n_channels; i++) {
 297                                 if (req->channels[i]->band !=
 298                                     local->hw_scan_band)
 299                                         continue;
 300                                 local->hw_scan_req->req.channels[n_chans] =
 301                                                         req->channels[i];
 302                                 n_chans++;
 303                                 bands_used |= BIT(req->channels[i]->band);
 304                         }
 305
 306                         local->hw_scan_band++;
 307                 } while (!n_chans);
 308         }
 309
 310         local->hw_scan_req->req.n_channels = n_chans;
 311         ieee80211_prepare_scan_chandef(&chandef, req->scan_width);
 312
 313         ielen = ieee80211_build_preq_ies(local,
 314                                          (u8 *)local->hw_scan_req->req.ie,
 315                                          local->hw_scan_ies_bufsize,
 316                                          &local->hw_scan_req->ies,
 317                                          req->ie, req->ie_len,
 318                                          bands_used, req->rates, &chandef);
 319         local->hw_scan_req->req.ie_len = ielen;
 320         local->hw_scan_req->req.no_cck = req->no_cck;
 321         ether_addr_copy(local->hw_scan_req->req.mac_addr, req->mac_addr);
 322         ether_addr_copy(local->hw_scan_req->req.mac_addr_mask,
 323                         req->mac_addr_mask);
 324         ether_addr_copy(local->hw_scan_req->req.bssid, req->bssid);
 325
 326         return true;
 327 }
 328
 329 static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted)
 330 {
 331         struct ieee80211_local *local = hw_to_local(hw);
 332         bool hw_scan = local->ops->hw_scan;
 333         bool was_scanning = local->scanning;
 334         struct cfg80211_scan_request *scan_req;
 335         struct ieee80211_sub_if_data *scan_sdata;
 336         struct ieee80211_sub_if_data *sdata;
 337
 338         lockdep_assert_held(&local->mtx);
 339
 340         /*
 341          * It's ok to abort a not-yet-running scan (that
 342          * we have one at all will be verified by checking
 343          * local->scan_req next), but not to complete it
 344          * successfully.
 345          */
 346         if (WARN_ON(!local->scanning && !aborted))
 347                 aborted = true;
 348
 349         if (WARN_ON(!local->scan_req))
 350                 return;
 351
 352         if (hw_scan && !aborted &&
 353             !ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS) &&
 354             ieee80211_prep_hw_scan(local)) {
 355                 int rc;
 356
 357                 rc = drv_hw_scan(local,
 358                         rcu_dereference_protected(local->scan_sdata,
 359                                                   lockdep_is_held(&local->mtx)),
 360                         local->hw_scan_req);
 361
 362                 if (rc == 0)
 363                         return;
 364
 365                 /* HW scan failed and is going to be reported as aborted,
 366                  * so clear old scan info.
 367                  */
 368                 memset(&local->scan_info, 0, sizeof(local->scan_info));
 369                 aborted = true;
 370         }
 371
 372         kfree(local->hw_scan_req);
 373         local->hw_scan_req = NULL;
 374
 375         scan_req = rcu_dereference_protected(local->scan_req,
 376                                              lockdep_is_held(&local->mtx));
 377
 378         if (scan_req != local->int_scan_req) {
 379                 local->scan_info.aborted = aborted;
 380                 cfg80211_scan_done(scan_req, &local->scan_info);
 381         }
 382         RCU_INIT_POINTER(local->scan_req, NULL);
 383
 384         scan_sdata = rcu_dereference_protected(local->scan_sdata,
 385                                                lockdep_is_held(&local->mtx));
 386         RCU_INIT_POINTER(local->scan_sdata, NULL);
 387
 388         local->scanning = 0;
 389         local->scan_chandef.chan = NULL;
 390
 391         /* Set power back to normal operating levels. */
 392         ieee80211_hw_config(local, 0);
 393
 394         if (!hw_scan) {
 395                 ieee80211_configure_filter(local);
 396                 drv_sw_scan_complete(local, scan_sdata);
 397                 ieee80211_offchannel_return(local);
 398         }
 399
 400         ieee80211_recalc_idle(local);
 401
 402         ieee80211_mlme_notify_scan_completed(local);
 403         ieee80211_ibss_notify_scan_completed(local);
 404
 405         /* Requeue all the work that might have been ignored while
 406          * the scan was in progress; if there was none this will
 407          * just be a no-op for the particular interface.
 408          */
 409         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 410                 if (ieee80211_sdata_running(sdata))
 411                         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 412         }
 413
 414         if (was_scanning)
 415                 ieee80211_start_next_roc(local);
 416 }
 417
 418 void ieee80211_scan_completed(struct ieee80211_hw *hw,
 419                               struct cfg80211_scan_info *info)
 420 {
 421         struct ieee80211_local *local = hw_to_local(hw);
 422
 423         trace_api_scan_completed(local, info->aborted);
 424
 425         set_bit(SCAN_COMPLETED, &local->scanning);
 426         if (info->aborted)
 427                 set_bit(SCAN_ABORTED, &local->scanning);
 428
 429         memcpy(&local->scan_info, info, sizeof(*info));
 430
 431         ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0);
 432 }
 433 EXPORT_SYMBOL(ieee80211_scan_completed);
 434
 435 static int ieee80211_start_sw_scan(struct ieee80211_local *local,
 436                                    struct ieee80211_sub_if_data *sdata)
 437 {
 438         /* Software scan is not supported in multi-channel cases */
 439         if (local->use_chanctx)
 440                 return -EOPNOTSUPP;
 441
 442         /*
 443          * Hardware/driver doesn't support hw_scan, so use software
 444          * scanning instead. First send a nullfunc frame with power save
 445          * bit on so that AP will buffer the frames for us while we are not
 446          * listening, then send probe requests to each channel and wait for
 447          * the responses. After all channels are scanned, tune back to the
 448          * original channel and send a nullfunc frame with power save bit
 449          * off to trigger the AP to send us all the buffered frames.
 450          *
 451          * Note that while local->sw_scanning is true everything else but
 452          * nullfunc frames and probe requests will be dropped in
 453          * ieee80211_tx_h_check_assoc().
 454          */
 455         drv_sw_scan_start(local, sdata, local->scan_addr);
 456
 457         local->leave_oper_channel_time = jiffies;
 458         local->next_scan_state = SCAN_DECISION;
 459         local->scan_channel_idx = 0;
 460
 461         ieee80211_offchannel_stop_vifs(local);
 462
 463         /* ensure nullfunc is transmitted before leaving operating channel */
 464         ieee80211_flush_queues(local, NULL, false);
 465
 466         ieee80211_configure_filter(local);
 467
 468         /* We need to set power level at maximum rate for scanning. */
 469         ieee80211_hw_config(local, 0);
 470
 471         ieee80211_queue_delayed_work(&local->hw,
 472                                      &local->scan_work, 0);
 473
 474         return 0;
 475 }
 476
 477 static bool ieee80211_can_scan(struct ieee80211_local *local,
 478                                struct ieee80211_sub_if_data *sdata)
 479 {
 480         if (ieee80211_is_radar_required(local))
 481                 return false;
 482
 483         if (!list_empty(&local->roc_list))
 484                 return false;
 485
 486         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
 487             sdata->u.mgd.flags & IEEE80211_STA_CONNECTION_POLL)
 488                 return false;
 489
 490         return true;
 491 }
 492
 493 void ieee80211_run_deferred_scan(struct ieee80211_local *local)
 494 {
 495         lockdep_assert_held(&local->mtx);
 496
 497         if (!local->scan_req || local->scanning)
 498                 return;
 499
 500         if (!ieee80211_can_scan(local,
 501                                 rcu_dereference_protected(
 502                                         local->scan_sdata,
 503                                         lockdep_is_held(&local->mtx))))
 504                 return;
 505
 506         ieee80211_queue_delayed_work(&local->hw, &local->scan_work,
 507                                      round_jiffies_relative(0));
 508 }
 509
 510 static void ieee80211_scan_state_send_probe(struct ieee80211_local *local,
 511                                             unsigned long *next_delay)
 512 {
 513         int i;
 514         struct ieee80211_sub_if_data *sdata;
 515         struct cfg80211_scan_request *scan_req;
 516         enum nl80211_band band = local->hw.conf.chandef.chan->band;
 517         u32 tx_flags;
 518
 519         scan_req = rcu_dereference_protected(local->scan_req,
 520                                              lockdep_is_held(&local->mtx));
 521
 522         tx_flags = IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
 523         if (scan_req->no_cck)
 524                 tx_flags |= IEEE80211_TX_CTL_NO_CCK_RATE;
 525
 526         sdata = rcu_dereference_protected(local->scan_sdata,
 527                                           lockdep_is_held(&local->mtx));
 528
 529         for (i = 0; i < scan_req->n_ssids; i++)
 530                 ieee80211_send_probe_req(
 531                         sdata, local->scan_addr, scan_req->bssid,
 532                         scan_req->ssids[i].ssid, scan_req->ssids[i].ssid_len,
 533                         scan_req->ie, scan_req->ie_len,
 534                         scan_req->rates[band], false,
 535                         tx_flags, local->hw.conf.chandef.chan, true);
 536
 537         /*
 538          * After sending probe requests, wait for probe responses
 539          * on the channel.
 540          */
 541         *next_delay = IEEE80211_CHANNEL_TIME;
 542         local->next_scan_state = SCAN_DECISION;
 543 }
 544
 545 static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata,
 546                                   struct cfg80211_scan_request *req)
 547 {
 548         struct ieee80211_local *local = sdata->local;
 549         int rc;
 550
 551         lockdep_assert_held(&local->mtx);
 552
 553         if (local->scan_req || ieee80211_is_radar_required(local))
 554                 return -EBUSY;
 555
 556         if (!ieee80211_can_scan(local, sdata)) {
 557                 /* wait for the work to finish/time out */
 558                 rcu_assign_pointer(local->scan_req, req);
 559                 rcu_assign_pointer(local->scan_sdata, sdata);
 560                 return 0;
 561         }
 562
 563         if (local->ops->hw_scan) {
 564                 u8 *ies;
 565
 566                 local->hw_scan_ies_bufsize = local->scan_ies_len + req->ie_len;
 567
 568                 if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) {
 569                         int i, n_bands = 0;
 570                         u8 bands_counted = 0;
 571
 572                         for (i = 0; i < req->n_channels; i++) {
 573                                 if (bands_counted & BIT(req->channels[i]->band))
 574                                         continue;
 575                                 bands_counted |= BIT(req->channels[i]->band);
 576                                 n_bands++;
 577                         }
 578
 579                         local->hw_scan_ies_bufsize *= n_bands;
 580                 }
 581
 582                 local->hw_scan_req = kmalloc(
 583                                 sizeof(*local->hw_scan_req) +
 584                                 req->n_channels * sizeof(req->channels[0]) +
 585                                 local->hw_scan_ies_bufsize, GFP_KERNEL);
 586                 if (!local->hw_scan_req)
 587                         return -ENOMEM;
 588
 589                 local->hw_scan_req->req.ssids = req->ssids;
 590                 local->hw_scan_req->req.n_ssids = req->n_ssids;
 591                 ies = (u8 *)local->hw_scan_req +
 592                         sizeof(*local->hw_scan_req) +
 593                         req->n_channels * sizeof(req->channels[0]);
 594                 local->hw_scan_req->req.ie = ies;
 595                 local->hw_scan_req->req.flags = req->flags;
 596                 eth_broadcast_addr(local->hw_scan_req->req.bssid);
 597                 local->hw_scan_req->req.duration = req->duration;
 598                 local->hw_scan_req->req.duration_mandatory =
 599                         req->duration_mandatory;
 600
 601                 local->hw_scan_band = 0;
 602
 603                 /*
 604                  * After allocating local->hw_scan_req, we must
 605                  * go through until ieee80211_prep_hw_scan(), so
 606                  * anything that might be changed here and leave
 607                  * this function early must not go after this
 608                  * allocation.
 609                  */
 610         }
 611
 612         rcu_assign_pointer(local->scan_req, req);
 613         rcu_assign_pointer(local->scan_sdata, sdata);
 614
 615         if (req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR)
 616                 get_random_mask_addr(local->scan_addr,
 617                                      req->mac_addr,
 618                                      req->mac_addr_mask);
 619         else
 620                 memcpy(local->scan_addr, sdata->vif.addr, ETH_ALEN);
 621
 622         if (local->ops->hw_scan) {
 623                 __set_bit(SCAN_HW_SCANNING, &local->scanning);
 624         } else if ((req->n_channels == 1) &&
 625                    (req->channels[0] == local->_oper_chandef.chan)) {
 626                 /*
 627                  * If we are scanning only on the operating channel
 628                  * then we do not need to stop normal activities
 629                  */
 630                 unsigned long next_delay;
 631
 632                 __set_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
 633
 634                 ieee80211_recalc_idle(local);
 635
 636                 /* Notify driver scan is starting, keep order of operations
 637                  * same as normal software scan, in case that matters. */
 638                 drv_sw_scan_start(local, sdata, local->scan_addr);
 639
 640                 ieee80211_configure_filter(local); /* accept probe-responses */
 641
 642                 /* We need to ensure power level is at max for scanning. */
 643                 ieee80211_hw_config(local, 0);
 644
 645                 if ((req->channels[0]->flags & (IEEE80211_CHAN_NO_IR |
 646                                                 IEEE80211_CHAN_RADAR)) ||
 647                     !req->n_ssids) {
 648                         next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
 649                 } else {
 650                         ieee80211_scan_state_send_probe(local, &next_delay);
 651                         next_delay = IEEE80211_CHANNEL_TIME;
 652                 }
 653
 654                 /* Now, just wait a bit and we are all done! */
 655                 ieee80211_queue_delayed_work(&local->hw, &local->scan_work,
 656                                              next_delay);
 657                 return 0;
 658         } else {
 659                 /* Do normal software scan */
 660                 __set_bit(SCAN_SW_SCANNING, &local->scanning);
 661         }
 662
 663         ieee80211_recalc_idle(local);
 664
 665         if (local->ops->hw_scan) {
 666                 WARN_ON(!ieee80211_prep_hw_scan(local));
 667                 rc = drv_hw_scan(local, sdata, local->hw_scan_req);
 668         } else {
 669                 rc = ieee80211_start_sw_scan(local, sdata);
 670         }
 671
 672         if (rc) {
 673                 kfree(local->hw_scan_req);
 674                 local->hw_scan_req = NULL;
 675                 local->scanning = 0;
 676
 677                 ieee80211_recalc_idle(local);
 678
 679                 local->scan_req = NULL;
 680                 RCU_INIT_POINTER(local->scan_sdata, NULL);
 681         }
 682
 683         return rc;
 684 }
 685
 686 static unsigned long
 687 ieee80211_scan_get_channel_time(struct ieee80211_channel *chan)
 688 {
 689         /*
 690          * TODO: channel switching also consumes quite some time,
 691          * add that delay as well to get a better estimation
 692          */
 693         if (chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR))
 694                 return IEEE80211_PASSIVE_CHANNEL_TIME;
 695         return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME;
 696 }
 697
 698 static void ieee80211_scan_state_decision(struct ieee80211_local *local,
 699                                           unsigned long *next_delay)
 700 {
 701         bool associated = false;
 702         bool tx_empty = true;
 703         bool bad_latency;
 704         struct ieee80211_sub_if_data *sdata;
 705         struct ieee80211_channel *next_chan;
 706         enum mac80211_scan_state next_scan_state;
 707         struct cfg80211_scan_request *scan_req;
 708
 709         /*
 710          * check if at least one STA interface is associated,
 711          * check if at least one STA interface has pending tx frames
 712          * and grab the lowest used beacon interval
 713          */
 714         mutex_lock(&local->iflist_mtx);
 715         list_for_each_entry(sdata, &local->interfaces, list) {
 716                 if (!ieee80211_sdata_running(sdata))
 717                         continue;
 718
 719                 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 720                         if (sdata->u.mgd.associated) {
 721                                 associated = true;
 722
 723                                 if (!qdisc_all_tx_empty(sdata->dev)) {
 724                                         tx_empty = false;
 725                                         break;
 726                                 }
 727                         }
 728                 }
 729         }
 730         mutex_unlock(&local->iflist_mtx);
 731
 732         scan_req = rcu_dereference_protected(local->scan_req,
 733                                              lockdep_is_held(&local->mtx));
 734
 735         next_chan = scan_req->channels[local->scan_channel_idx];
 736
 737         /*
 738          * we're currently scanning a different channel, let's
 739          * see if we can scan another channel without interfering
 740          * with the current traffic situation.
 741          *
 742          * Keep good latency, do not stay off-channel more than 125 ms.
 743          */
 744
 745         bad_latency = time_after(jiffies +
 746                                  ieee80211_scan_get_channel_time(next_chan),
 747                                  local->leave_oper_channel_time + HZ / 8);
 748
 749         if (associated && !tx_empty) {
 750                 if (scan_req->flags & NL80211_SCAN_FLAG_LOW_PRIORITY)
 751                         next_scan_state = SCAN_ABORT;
 752                 else
 753                         next_scan_state = SCAN_SUSPEND;
 754         } else if (associated && bad_latency) {
 755                 next_scan_state = SCAN_SUSPEND;
 756         } else {
 757                 next_scan_state = SCAN_SET_CHANNEL;
 758         }
 759
 760         local->next_scan_state = next_scan_state;
 761
 762         *next_delay = 0;
 763 }
 764
 765 static void ieee80211_scan_state_set_channel(struct ieee80211_local *local,
 766                                              unsigned long *next_delay)
 767 {
 768         int skip;
 769         struct ieee80211_channel *chan;
 770         enum nl80211_bss_scan_width oper_scan_width;
 771         struct cfg80211_scan_request *scan_req;
 772
 773         scan_req = rcu_dereference_protected(local->scan_req,
 774                                              lockdep_is_held(&local->mtx));
 775
 776         skip = 0;
 777         chan = scan_req->channels[local->scan_channel_idx];
 778
 779         local->scan_chandef.chan = chan;
 780         local->scan_chandef.center_freq1 = chan->center_freq;
 781         local->scan_chandef.center_freq2 = 0;
 782         switch (scan_req->scan_width) {
 783         case NL80211_BSS_CHAN_WIDTH_5:
 784                 local->scan_chandef.width = NL80211_CHAN_WIDTH_5;
 785                 break;
 786         case NL80211_BSS_CHAN_WIDTH_10:
 787                 local->scan_chandef.width = NL80211_CHAN_WIDTH_10;
 788                 break;
 789         case NL80211_BSS_CHAN_WIDTH_20:
 790                 /* If scanning on oper channel, use whatever channel-type
 791                  * is currently in use.
 792                  */
 793                 oper_scan_width = cfg80211_chandef_to_scan_width(
 794                                         &local->_oper_chandef);
 795                 if (chan == local->_oper_chandef.chan &&
 796                     oper_scan_width == scan_req->scan_width)
 797                         local->scan_chandef = local->_oper_chandef;
 798                 else
 799                         local->scan_chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
 800                 break;
 801         }
 802
 803         if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL))
 804                 skip = 1;
 805
 806         /* advance state machine to next channel/band */
 807         local->scan_channel_idx++;
 808
 809         if (skip) {
 810                 /* if we skip this channel return to the decision state */
 811                 local->next_scan_state = SCAN_DECISION;
 812                 return;
 813         }
 814
 815         /*
 816          * Probe delay is used to update the NAV, cf. 11.1.3.2.2
 817          * (which unfortunately doesn't say _why_ step a) is done,
 818          * but it waits for the probe delay or until a frame is
 819          * received - and the received frame would update the NAV).
 820          * For now, we do not support waiting until a frame is
 821          * received.
 822          *
 823          * In any case, it is not necessary for a passive scan.
 824          */
 825         if ((chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR)) ||
 826             !scan_req->n_ssids) {
 827                 *next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
 828                 local->next_scan_state = SCAN_DECISION;
 829                 return;
 830         }
 831
 832         /* active scan, send probes */
 833         *next_delay = IEEE80211_PROBE_DELAY;
 834         local->next_scan_state = SCAN_SEND_PROBE;
 835 }
 836
 837 static void ieee80211_scan_state_suspend(struct ieee80211_local *local,
 838                                          unsigned long *next_delay)
 839 {
 840         /* switch back to the operating channel */
 841         local->scan_chandef.chan = NULL;
 842         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
 843
 844         /* disable PS */
 845         ieee80211_offchannel_return(local);
 846
 847         *next_delay = HZ / 5;
 848         /* afterwards, resume scan & go to next channel */
 849         local->next_scan_state = SCAN_RESUME;
 850 }
 851
 852 static void ieee80211_scan_state_resume(struct ieee80211_local *local,
 853                                         unsigned long *next_delay)
 854 {
 855         ieee80211_offchannel_stop_vifs(local);
 856
 857         if (local->ops->flush) {
 858                 ieee80211_flush_queues(local, NULL, false);
 859                 *next_delay = 0;
 860         } else
 861                 *next_delay = HZ / 10;
 862
 863         /* remember when we left the operating channel */
 864         local->leave_oper_channel_time = jiffies;
 865
 866         /* advance to the next channel to be scanned */
 867         local->next_scan_state = SCAN_SET_CHANNEL;
 868 }
 869
 870 void ieee80211_scan_work(struct work_struct *work)
 871 {
 872         struct ieee80211_local *local =
 873                 container_of(work, struct ieee80211_local, scan_work.work);
 874         struct ieee80211_sub_if_data *sdata;
 875         struct cfg80211_scan_request *scan_req;
 876         unsigned long next_delay = 0;
 877         bool aborted;
 878
 879         mutex_lock(&local->mtx);
 880
 881         if (!ieee80211_can_run_worker(local)) {
 882                 aborted = true;
 883                 goto out_complete;
 884         }
 885
 886         sdata = rcu_dereference_protected(local->scan_sdata,
 887                                           lockdep_is_held(&local->mtx));
 888         scan_req = rcu_dereference_protected(local->scan_req,
 889                                              lockdep_is_held(&local->mtx));
 890
 891         /* When scanning on-channel, the first-callback means completed. */
 892         if (test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning)) {
 893                 aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning);
 894                 goto out_complete;
 895         }
 896
 897         if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) {
 898                 aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning);
 899                 goto out_complete;
 900         }
 901
 902         if (!sdata || !scan_req)
 903                 goto out;
 904
 905         if (!local->scanning) {
 906                 int rc;
 907
 908                 RCU_INIT_POINTER(local->scan_req, NULL);
 909                 RCU_INIT_POINTER(local->scan_sdata, NULL);
 910
 911                 rc = __ieee80211_start_scan(sdata, scan_req);
 912                 if (rc) {
 913                         /* need to complete scan in cfg80211 */
 914                         rcu_assign_pointer(local->scan_req, scan_req);
 915                         aborted = true;
 916                         goto out_complete;
 917                 } else
 918                         goto out;
 919         }
 920
 921         /*
 922          * as long as no delay is required advance immediately
 923          * without scheduling a new work
 924          */
 925         do {
 926                 if (!ieee80211_sdata_running(sdata)) {
 927                         aborted = true;
 928                         goto out_complete;
 929                 }
 930
 931                 switch (local->next_scan_state) {
 932                 case SCAN_DECISION:
 933                         /* if no more bands/channels left, complete scan */
 934                         if (local->scan_channel_idx >= scan_req->n_channels) {
 935                                 aborted = false;
 936                                 goto out_complete;
 937                         }
 938                         ieee80211_scan_state_decision(local, &next_delay);
 939                         break;
 940                 case SCAN_SET_CHANNEL:
 941                         ieee80211_scan_state_set_channel(local, &next_delay);
 942                         break;
 943                 case SCAN_SEND_PROBE:
 944                         ieee80211_scan_state_send_probe(local, &next_delay);
 945                         break;
 946                 case SCAN_SUSPEND:
 947                         ieee80211_scan_state_suspend(local, &next_delay);
 948                         break;
 949                 case SCAN_RESUME:
 950                         ieee80211_scan_state_resume(local, &next_delay);
 951                         break;
 952                 case SCAN_ABORT:
 953                         aborted = true;
 954                         goto out_complete;
 955                 }
 956         } while (next_delay == 0);
 957
 958         ieee80211_queue_delayed_work(&local->hw, &local->scan_work, next_delay);
 959         goto out;
 960
 961 out_complete:
 962         __ieee80211_scan_completed(&local->hw, aborted);
 963 out:
 964         mutex_unlock(&local->mtx);
 965 }
 966
 967 int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata,
 968                            struct cfg80211_scan_request *req)
 969 {
 970         int res;
 971
 972         mutex_lock(&sdata->local->mtx);
 973         res = __ieee80211_start_scan(sdata, req);
 974         mutex_unlock(&sdata->local->mtx);
 975
 976         return res;
 977 }
 978
 979 int ieee80211_request_ibss_scan(struct ieee80211_sub_if_data *sdata,
 980                                 const u8 *ssid, u8 ssid_len,
 981                                 struct ieee80211_channel **channels,
 982                                 unsigned int n_channels,
 983                                 enum nl80211_bss_scan_width scan_width)
 984 {
 985         struct ieee80211_local *local = sdata->local;
 986         int ret = -EBUSY, i, n_ch = 0;
 987         enum nl80211_band band;
 988
 989         mutex_lock(&local->mtx);
 990
 991         /* busy scanning */
 992         if (local->scan_req)
 993                 goto unlock;
 994
 995         /* fill internal scan request */
 996         if (!channels) {
 997                 int max_n;
 998
 999                 for (band = 0; band < NUM_NL80211_BANDS; band++) {
1000                         if (!local->hw.wiphy->bands[band])
1001                                 continue;
1002
1003                         max_n = local->hw.wiphy->bands[band]->n_channels;
1004                         for (i = 0; i < max_n; i++) {
1005                                 struct ieee80211_channel *tmp_ch =
1006                                     &local->hw.wiphy->bands[band]->channels[i];
1007
1008                                 if (tmp_ch->flags & (IEEE80211_CHAN_NO_IR |
1009                                                      IEEE80211_CHAN_DISABLED))
1010                                         continue;
1011
1012                                 local->int_scan_req->channels[n_ch] = tmp_ch;
1013                                 n_ch++;
1014                         }
1015                 }
1016
1017                 if (WARN_ON_ONCE(n_ch == 0))
1018                         goto unlock;
1019
1020                 local->int_scan_req->n_channels = n_ch;
1021         } else {
1022                 for (i = 0; i < n_channels; i++) {
1023                         if (channels[i]->flags & (IEEE80211_CHAN_NO_IR |
1024                                                   IEEE80211_CHAN_DISABLED))
1025                                 continue;
1026
1027                         local->int_scan_req->channels[n_ch] = channels[i];
1028                         n_ch++;
1029                 }
1030
1031                 if (WARN_ON_ONCE(n_ch == 0))
1032                         goto unlock;
1033
1034                 local->int_scan_req->n_channels = n_ch;
1035         }
1036
1037         local->int_scan_req->ssids = &local->scan_ssid;
1038         local->int_scan_req->n_ssids = 1;
1039         local->int_scan_req->scan_width = scan_width;
1040         memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN);
1041         local->int_scan_req->ssids[0].ssid_len = ssid_len;
1042
1043         ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req);
1044  unlock:
1045         mutex_unlock(&local->mtx);
1046         return ret;
1047 }
1048
1049 /*
1050  * Only call this function when a scan can't be queued -- under RTNL.
1051  */
1052 void ieee80211_scan_cancel(struct ieee80211_local *local)
1053 {
1054         /*
1055          * We are canceling software scan, or deferred scan that was not
1056          * yet really started (see __ieee80211_start_scan ).
1057          *
1058          * Regarding hardware scan:
1059          * - we can not call  __ieee80211_scan_completed() as when
1060          *   SCAN_HW_SCANNING bit is set this function change
1061          *   local->hw_scan_req to operate on 5G band, what race with
1062          *   driver which can use local->hw_scan_req
1063          *
1064          * - we can not cancel scan_work since driver can schedule it
1065          *   by ieee80211_scan_completed(..., true) to finish scan
1066          *
1067          * Hence we only call the cancel_hw_scan() callback, but the low-level
1068          * driver is still responsible for calling ieee80211_scan_completed()
1069          * after the scan was completed/aborted.
1070          */
1071
1072         mutex_lock(&local->mtx);
1073         if (!local->scan_req)
1074                 goto out;
1075
1076         /*
1077          * We have a scan running and the driver already reported completion,
1078          * but the worker hasn't run yet or is stuck on the mutex - mark it as
1079          * cancelled.
1080          */
1081         if (test_bit(SCAN_HW_SCANNING, &local->scanning) &&
1082             test_bit(SCAN_COMPLETED, &local->scanning)) {
1083                 set_bit(SCAN_HW_CANCELLED, &local->scanning);
1084                 goto out;
1085         }
1086
1087         if (test_bit(SCAN_HW_SCANNING, &local->scanning)) {
1088                 /*
1089                  * Make sure that __ieee80211_scan_completed doesn't trigger a
1090                  * scan on another band.
1091                  */
1092                 set_bit(SCAN_HW_CANCELLED, &local->scanning);
1093                 if (local->ops->cancel_hw_scan)
1094                         drv_cancel_hw_scan(local,
1095                                 rcu_dereference_protected(local->scan_sdata,
1096                                                 lockdep_is_held(&local->mtx)));
1097                 goto out;
1098         }
1099
1100         /*
1101          * If the work is currently running, it must be blocked on
1102          * the mutex, but we'll set scan_sdata = NULL and it'll
1103          * simply exit once it acquires the mutex.
1104          */
1105         cancel_delayed_work(&local->scan_work);
1106         /* and clean up */
1107         memset(&local->scan_info, 0, sizeof(local->scan_info));
1108         __ieee80211_scan_completed(&local->hw, true);
1109 out:
1110         mutex_unlock(&local->mtx);
1111 }
1112
1113 int __ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata,
1114                                         struct cfg80211_sched_scan_request *req)
1115 {
1116         struct ieee80211_local *local = sdata->local;
1117         struct ieee80211_scan_ies sched_scan_ies = {};
1118         struct cfg80211_chan_def chandef;
1119         int ret, i, iebufsz, num_bands = 0;
1120         u32 rate_masks[NUM_NL80211_BANDS] = {};
1121         u8 bands_used = 0;
1122         u8 *ie;
1123         size_t len;
1124
1125         iebufsz = local->scan_ies_len + req->ie_len;
1126
1127         lockdep_assert_held(&local->mtx);
1128
1129         if (!local->ops->sched_scan_start)
1130                 return -ENOTSUPP;
1131
1132         for (i = 0; i < NUM_NL80211_BANDS; i++) {
1133                 if (local->hw.wiphy->bands[i]) {
1134                         bands_used |= BIT(i);
1135                         rate_masks[i] = (u32) -1;
1136                         num_bands++;
1137                 }
1138         }
1139
1140         ie = kzalloc(num_bands * iebufsz, GFP_KERNEL);
1141         if (!ie) {
1142                 ret = -ENOMEM;
1143                 goto out;
1144         }
1145
1146         ieee80211_prepare_scan_chandef(&chandef, req->scan_width);
1147
1148         len = ieee80211_build_preq_ies(local, ie, num_bands * iebufsz,
1149                                        &sched_scan_ies, req->ie,
1150                                        req->ie_len, bands_used,
1151                                        rate_masks, &chandef);
1152
1153         ret = drv_sched_scan_start(local, sdata, req, &sched_scan_ies);
1154         if (ret == 0) {
1155                 rcu_assign_pointer(local->sched_scan_sdata, sdata);
1156                 rcu_assign_pointer(local->sched_scan_req, req);
1157         }
1158
1159         kfree(ie);
1160
1161 out:
1162         if (ret) {
1163                 /* Clean in case of failure after HW restart or upon resume. */
1164                 RCU_INIT_POINTER(local->sched_scan_sdata, NULL);
1165                 RCU_INIT_POINTER(local->sched_scan_req, NULL);
1166         }
1167
1168         return ret;
1169 }
1170
1171 int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata,
1172                                        struct cfg80211_sched_scan_request *req)
1173 {
1174         struct ieee80211_local *local = sdata->local;
1175         int ret;
1176
1177         mutex_lock(&local->mtx);
1178
1179         if (rcu_access_pointer(local->sched_scan_sdata)) {
1180                 mutex_unlock(&local->mtx);
1181                 return -EBUSY;
1182         }
1183
1184         ret = __ieee80211_request_sched_scan_start(sdata, req);
1185
1186         mutex_unlock(&local->mtx);
1187         return ret;
1188 }
1189
1190 int ieee80211_request_sched_scan_stop(struct ieee80211_local *local)
1191 {
1192         struct ieee80211_sub_if_data *sched_scan_sdata;
1193         int ret = -ENOENT;
1194
1195         mutex_lock(&local->mtx);
1196
1197         if (!local->ops->sched_scan_stop) {
1198                 ret = -ENOTSUPP;
1199                 goto out;
1200         }
1201
1202         /* We don't want to restart sched scan anymore. */
1203         RCU_INIT_POINTER(local->sched_scan_req, NULL);
1204
1205         sched_scan_sdata = rcu_dereference_protected(local->sched_scan_sdata,
1206                                                 lockdep_is_held(&local->mtx));
1207         if (sched_scan_sdata) {
1208                 ret = drv_sched_scan_stop(local, sched_scan_sdata);
1209                 if (!ret)
1210                         RCU_INIT_POINTER(local->sched_scan_sdata, NULL);
1211         }
1212 out:
1213         mutex_unlock(&local->mtx);
1214
1215         return ret;
1216 }
1217
1218 void ieee80211_sched_scan_results(struct ieee80211_hw *hw)
1219 {
1220         struct ieee80211_local *local = hw_to_local(hw);
1221
1222         trace_api_sched_scan_results(local);
1223
1224         cfg80211_sched_scan_results(hw->wiphy);
1225 }
1226 EXPORT_SYMBOL(ieee80211_sched_scan_results);
1227
1228 void ieee80211_sched_scan_end(struct ieee80211_local *local)
1229 {
1230         mutex_lock(&local->mtx);
1231
1232         if (!rcu_access_pointer(local->sched_scan_sdata)) {
1233                 mutex_unlock(&local->mtx);
1234                 return;
1235         }
1236
1237         RCU_INIT_POINTER(local->sched_scan_sdata, NULL);
1238
1239         /* If sched scan was aborted by the driver. */
1240         RCU_INIT_POINTER(local->sched_scan_req, NULL);
1241
1242         mutex_unlock(&local->mtx);
1243
1244         cfg80211_sched_scan_stopped(local->hw.wiphy);
1245 }
1246
1247 void ieee80211_sched_scan_stopped_work(struct work_struct *work)
1248 {
1249         struct ieee80211_local *local =
1250                 container_of(work, struct ieee80211_local,
1251                              sched_scan_stopped_work);
1252
1253         ieee80211_sched_scan_end(local);
1254 }
1255
1256 void ieee80211_sched_scan_stopped(struct ieee80211_hw *hw)
1257 {
1258         struct ieee80211_local *local = hw_to_local(hw);
1259
1260         trace_api_sched_scan_stopped(local);
1261
1262         /*
1263          * this shouldn't really happen, so for simplicity
1264          * simply ignore it, and let mac80211 reconfigure
1265          * the sched scan later on.
1266          */
1267         if (local->in_reconfig)
1268                 return;
1269
1270         schedule_work(&local->sched_scan_stopped_work);
1271 }
1272 EXPORT_SYMBOL(ieee80211_sched_scan_stopped);