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 done, so clear
 366                  * old scan info.
 367                  */
 368                 memset(&local->scan_info, 0, sizeof(local->scan_info));
 369         }
 370
 371         kfree(local->hw_scan_req);
 372         local->hw_scan_req = NULL;
 373
 374         scan_req = rcu_dereference_protected(local->scan_req,
 375                                              lockdep_is_held(&local->mtx));
 376
 377         if (scan_req != local->int_scan_req) {
 378                 local->scan_info.aborted = aborted;
 379                 cfg80211_scan_done(scan_req, &local->scan_info);
 380         }
 381         RCU_INIT_POINTER(local->scan_req, NULL);
 382
 383         scan_sdata = rcu_dereference_protected(local->scan_sdata,
 384                                                lockdep_is_held(&local->mtx));
 385         RCU_INIT_POINTER(local->scan_sdata, NULL);
 386
 387         local->scanning = 0;
 388         local->scan_chandef.chan = NULL;
 389
 390         /* Set power back to normal operating levels. */
 391         ieee80211_hw_config(local, 0);
 392
 393         if (!hw_scan) {
 394                 ieee80211_configure_filter(local);
 395                 drv_sw_scan_complete(local, scan_sdata);
 396                 ieee80211_offchannel_return(local);
 397         }
 398
 399         ieee80211_recalc_idle(local);
 400
 401         ieee80211_mlme_notify_scan_completed(local);
 402         ieee80211_ibss_notify_scan_completed(local);
 403
 404         /* Requeue all the work that might have been ignored while
 405          * the scan was in progress; if there was none this will
 406          * just be a no-op for the particular interface.
 407          */
 408         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 409                 if (ieee80211_sdata_running(sdata))
 410                         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 411         }
 412
 413         if (was_scanning)
 414                 ieee80211_start_next_roc(local);
 415 }
 416
 417 void ieee80211_scan_completed(struct ieee80211_hw *hw,
 418                               struct cfg80211_scan_info *info)
 419 {
 420         struct ieee80211_local *local = hw_to_local(hw);
 421
 422         trace_api_scan_completed(local, info);
 423
 424         set_bit(SCAN_COMPLETED, &local->scanning);
 425         if (info->aborted)
 426                 set_bit(SCAN_ABORTED, &local->scanning);
 427
 428         memcpy(&local->scan_info, info, sizeof(*info));
 429
 430         ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0);
 431 }
 432 EXPORT_SYMBOL(ieee80211_scan_completed);
 433
 434 static int ieee80211_start_sw_scan(struct ieee80211_local *local,
 435                                    struct ieee80211_sub_if_data *sdata)
 436 {
 437         /* Software scan is not supported in multi-channel cases */
 438         if (local->use_chanctx)
 439                 return -EOPNOTSUPP;
 440
 441         /*
 442          * Hardware/driver doesn't support hw_scan, so use software
 443          * scanning instead. First send a nullfunc frame with power save
 444          * bit on so that AP will buffer the frames for us while we are not
 445          * listening, then send probe requests to each channel and wait for
 446          * the responses. After all channels are scanned, tune back to the
 447          * original channel and send a nullfunc frame with power save bit
 448          * off to trigger the AP to send us all the buffered frames.
 449          *
 450          * Note that while local->sw_scanning is true everything else but
 451          * nullfunc frames and probe requests will be dropped in
 452          * ieee80211_tx_h_check_assoc().
 453          */
 454         drv_sw_scan_start(local, sdata, local->scan_addr);
 455
 456         local->leave_oper_channel_time = jiffies;
 457         local->next_scan_state = SCAN_DECISION;
 458         local->scan_channel_idx = 0;
 459
 460         ieee80211_offchannel_stop_vifs(local);
 461
 462         /* ensure nullfunc is transmitted before leaving operating channel */
 463         ieee80211_flush_queues(local, NULL, false);
 464
 465         ieee80211_configure_filter(local);
 466
 467         /* We need to set power level at maximum rate for scanning. */
 468         ieee80211_hw_config(local, 0);
 469
 470         ieee80211_queue_delayed_work(&local->hw,
 471                                      &local->scan_work, 0);
 472
 473         return 0;
 474 }
 475
 476 static bool ieee80211_can_scan(struct ieee80211_local *local,
 477                                struct ieee80211_sub_if_data *sdata)
 478 {
 479         if (ieee80211_is_radar_required(local))
 480                 return false;
 481
 482         if (!list_empty(&local->roc_list))
 483                 return false;
 484
 485         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
 486             sdata->u.mgd.flags & IEEE80211_STA_CONNECTION_POLL)
 487                 return false;
 488
 489         return true;
 490 }
 491
 492 void ieee80211_run_deferred_scan(struct ieee80211_local *local)
 493 {
 494         lockdep_assert_held(&local->mtx);
 495
 496         if (!local->scan_req || local->scanning)
 497                 return;
 498
 499         if (!ieee80211_can_scan(local,
 500                                 rcu_dereference_protected(
 501                                         local->scan_sdata,
 502                                         lockdep_is_held(&local->mtx))))
 503                 return;
 504
 505         ieee80211_queue_delayed_work(&local->hw, &local->scan_work,
 506                                      round_jiffies_relative(0));
 507 }
 508
 509 static void ieee80211_scan_state_send_probe(struct ieee80211_local *local,
 510                                             unsigned long *next_delay)
 511 {
 512         int i;
 513         struct ieee80211_sub_if_data *sdata;
 514         struct cfg80211_scan_request *scan_req;
 515         enum nl80211_band band = local->hw.conf.chandef.chan->band;
 516         u32 tx_flags;
 517
 518         scan_req = rcu_dereference_protected(local->scan_req,
 519                                              lockdep_is_held(&local->mtx));
 520
 521         tx_flags = IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
 522         if (scan_req->no_cck)
 523                 tx_flags |= IEEE80211_TX_CTL_NO_CCK_RATE;
 524
 525         sdata = rcu_dereference_protected(local->scan_sdata,
 526                                           lockdep_is_held(&local->mtx));
 527
 528         for (i = 0; i < scan_req->n_ssids; i++)
 529                 ieee80211_send_probe_req(
 530                         sdata, local->scan_addr, scan_req->bssid,
 531                         scan_req->ssids[i].ssid, scan_req->ssids[i].ssid_len,
 532                         scan_req->ie, scan_req->ie_len,
 533                         scan_req->rates[band], false,
 534                         tx_flags, local->hw.conf.chandef.chan, true);
 535
 536         /*
 537          * After sending probe requests, wait for probe responses
 538          * on the channel.
 539          */
 540         *next_delay = IEEE80211_CHANNEL_TIME;
 541         local->next_scan_state = SCAN_DECISION;
 542 }
 543
 544 static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata,
 545                                   struct cfg80211_scan_request *req)
 546 {
 547         struct ieee80211_local *local = sdata->local;
 548         int rc;
 549
 550         lockdep_assert_held(&local->mtx);
 551
 552         if (local->scan_req || ieee80211_is_radar_required(local))
 553                 return -EBUSY;
 554
 555         if (!ieee80211_can_scan(local, sdata)) {
 556                 /* wait for the work to finish/time out */
 557                 rcu_assign_pointer(local->scan_req, req);
 558                 rcu_assign_pointer(local->scan_sdata, sdata);
 559                 return 0;
 560         }
 561
 562         if (local->ops->hw_scan) {
 563                 u8 *ies;
 564
 565                 local->hw_scan_ies_bufsize = local->scan_ies_len + req->ie_len;
 566
 567                 if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) {
 568                         int i, n_bands = 0;
 569                         u8 bands_counted = 0;
 570
 571                         for (i = 0; i < req->n_channels; i++) {
 572                                 if (bands_counted & BIT(req->channels[i]->band))
 573                                         continue;
 574                                 bands_counted |= BIT(req->channels[i]->band);
 575                                 n_bands++;
 576                         }
 577
 578                         local->hw_scan_ies_bufsize *= n_bands;
 579                 }
 580
 581                 local->hw_scan_req = kmalloc(
 582                                 sizeof(*local->hw_scan_req) +
 583                                 req->n_channels * sizeof(req->channels[0]) +
 584                                 local->hw_scan_ies_bufsize, GFP_KERNEL);
 585                 if (!local->hw_scan_req)
 586                         return -ENOMEM;
 587
 588                 local->hw_scan_req->req.ssids = req->ssids;
 589                 local->hw_scan_req->req.n_ssids = req->n_ssids;
 590                 ies = (u8 *)local->hw_scan_req +
 591                         sizeof(*local->hw_scan_req) +
 592                         req->n_channels * sizeof(req->channels[0]);
 593                 local->hw_scan_req->req.ie = ies;
 594                 local->hw_scan_req->req.flags = req->flags;
 595                 eth_broadcast_addr(local->hw_scan_req->req.bssid);
 596                 local->hw_scan_req->req.duration = req->duration;
 597                 local->hw_scan_req->req.duration_mandatory =
 598                         req->duration_mandatory;
 599
 600                 local->hw_scan_band = 0;
 601
 602                 /*
 603                  * After allocating local->hw_scan_req, we must
 604                  * go through until ieee80211_prep_hw_scan(), so
 605                  * anything that might be changed here and leave
 606                  * this function early must not go after this
 607                  * allocation.
 608                  */
 609         }
 610
 611         rcu_assign_pointer(local->scan_req, req);
 612         rcu_assign_pointer(local->scan_sdata, sdata);
 613
 614         if (req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR)
 615                 get_random_mask_addr(local->scan_addr,
 616                                      req->mac_addr,
 617                                      req->mac_addr_mask);
 618         else
 619                 memcpy(local->scan_addr, sdata->vif.addr, ETH_ALEN);
 620
 621         if (local->ops->hw_scan) {
 622                 __set_bit(SCAN_HW_SCANNING, &local->scanning);
 623         } else if ((req->n_channels == 1) &&
 624                    (req->channels[0] == local->_oper_chandef.chan)) {
 625                 /*
 626                  * If we are scanning only on the operating channel
 627                  * then we do not need to stop normal activities
 628                  */
 629                 unsigned long next_delay;
 630
 631                 __set_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
 632
 633                 ieee80211_recalc_idle(local);
 634
 635                 /* Notify driver scan is starting, keep order of operations
 636                  * same as normal software scan, in case that matters. */
 637                 drv_sw_scan_start(local, sdata, local->scan_addr);
 638
 639                 ieee80211_configure_filter(local); /* accept probe-responses */
 640
 641                 /* We need to ensure power level is at max for scanning. */
 642                 ieee80211_hw_config(local, 0);
 643
 644                 if ((req->channels[0]->flags & (IEEE80211_CHAN_NO_IR |
 645                                                 IEEE80211_CHAN_RADAR)) ||
 646                     !req->n_ssids) {
 647                         next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
 648                 } else {
 649                         ieee80211_scan_state_send_probe(local, &next_delay);
 650                         next_delay = IEEE80211_CHANNEL_TIME;
 651                 }
 652
 653                 /* Now, just wait a bit and we are all done! */
 654                 ieee80211_queue_delayed_work(&local->hw, &local->scan_work,
 655                                              next_delay);
 656                 return 0;
 657         } else {
 658                 /* Do normal software scan */
 659                 __set_bit(SCAN_SW_SCANNING, &local->scanning);
 660         }
 661
 662         ieee80211_recalc_idle(local);
 663
 664         if (local->ops->hw_scan) {
 665                 WARN_ON(!ieee80211_prep_hw_scan(local));
 666                 rc = drv_hw_scan(local, sdata, local->hw_scan_req);
 667         } else {
 668                 rc = ieee80211_start_sw_scan(local, sdata);
 669         }
 670
 671         if (rc) {
 672                 kfree(local->hw_scan_req);
 673                 local->hw_scan_req = NULL;
 674                 local->scanning = 0;
 675
 676                 ieee80211_recalc_idle(local);
 677
 678                 local->scan_req = NULL;
 679                 RCU_INIT_POINTER(local->scan_sdata, NULL);
 680         }
 681
 682         return rc;
 683 }
 684
 685 static unsigned long
 686 ieee80211_scan_get_channel_time(struct ieee80211_channel *chan)
 687 {
 688         /*
 689          * TODO: channel switching also consumes quite some time,
 690          * add that delay as well to get a better estimation
 691          */
 692         if (chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR))
 693                 return IEEE80211_PASSIVE_CHANNEL_TIME;
 694         return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME;
 695 }
 696
 697 static void ieee80211_scan_state_decision(struct ieee80211_local *local,
 698                                           unsigned long *next_delay)
 699 {
 700         bool associated = false;
 701         bool tx_empty = true;
 702         bool bad_latency;
 703         struct ieee80211_sub_if_data *sdata;
 704         struct ieee80211_channel *next_chan;
 705         enum mac80211_scan_state next_scan_state;
 706         struct cfg80211_scan_request *scan_req;
 707
 708         /*
 709          * check if at least one STA interface is associated,
 710          * check if at least one STA interface has pending tx frames
 711          * and grab the lowest used beacon interval
 712          */
 713         mutex_lock(&local->iflist_mtx);
 714         list_for_each_entry(sdata, &local->interfaces, list) {
 715                 if (!ieee80211_sdata_running(sdata))
 716                         continue;
 717
 718                 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 719                         if (sdata->u.mgd.associated) {
 720                                 associated = true;
 721
 722                                 if (!qdisc_all_tx_empty(sdata->dev)) {
 723                                         tx_empty = false;
 724                                         break;
 725                                 }
 726                         }
 727                 }
 728         }
 729         mutex_unlock(&local->iflist_mtx);
 730
 731         scan_req = rcu_dereference_protected(local->scan_req,
 732                                              lockdep_is_held(&local->mtx));
 733
 734         next_chan = scan_req->channels[local->scan_channel_idx];
 735
 736         /*
 737          * we're currently scanning a different channel, let's
 738          * see if we can scan another channel without interfering
 739          * with the current traffic situation.
 740          *
 741          * Keep good latency, do not stay off-channel more than 125 ms.
 742          */
 743
 744         bad_latency = time_after(jiffies +
 745                                  ieee80211_scan_get_channel_time(next_chan),
 746                                  local->leave_oper_channel_time + HZ / 8);
 747
 748         if (associated && !tx_empty) {
 749                 if (scan_req->flags & NL80211_SCAN_FLAG_LOW_PRIORITY)
 750                         next_scan_state = SCAN_ABORT;
 751                 else
 752                         next_scan_state = SCAN_SUSPEND;
 753         } else if (associated && bad_latency) {
 754                 next_scan_state = SCAN_SUSPEND;
 755         } else {
 756                 next_scan_state = SCAN_SET_CHANNEL;
 757         }
 758
 759         local->next_scan_state = next_scan_state;
 760
 761         *next_delay = 0;
 762 }
 763
 764 static void ieee80211_scan_state_set_channel(struct ieee80211_local *local,
 765                                              unsigned long *next_delay)
 766 {
 767         int skip;
 768         struct ieee80211_channel *chan;
 769         enum nl80211_bss_scan_width oper_scan_width;
 770         struct cfg80211_scan_request *scan_req;
 771
 772         scan_req = rcu_dereference_protected(local->scan_req,
 773                                              lockdep_is_held(&local->mtx));
 774
 775         skip = 0;
 776         chan = scan_req->channels[local->scan_channel_idx];
 777
 778         local->scan_chandef.chan = chan;
 779         local->scan_chandef.center_freq1 = chan->center_freq;
 780         local->scan_chandef.center_freq2 = 0;
 781         switch (scan_req->scan_width) {
 782         case NL80211_BSS_CHAN_WIDTH_5:
 783                 local->scan_chandef.width = NL80211_CHAN_WIDTH_5;
 784                 break;
 785         case NL80211_BSS_CHAN_WIDTH_10:
 786                 local->scan_chandef.width = NL80211_CHAN_WIDTH_10;
 787                 break;
 788         case NL80211_BSS_CHAN_WIDTH_20:
 789                 /* If scanning on oper channel, use whatever channel-type
 790                  * is currently in use.
 791                  */
 792                 oper_scan_width = cfg80211_chandef_to_scan_width(
 793                                         &local->_oper_chandef);
 794                 if (chan == local->_oper_chandef.chan &&
 795                     oper_scan_width == scan_req->scan_width)
 796                         local->scan_chandef = local->_oper_chandef;
 797                 else
 798                         local->scan_chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
 799                 break;
 800         }
 801
 802         if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL))
 803                 skip = 1;
 804
 805         /* advance state machine to next channel/band */
 806         local->scan_channel_idx++;
 807
 808         if (skip) {
 809                 /* if we skip this channel return to the decision state */
 810                 local->next_scan_state = SCAN_DECISION;
 811                 return;
 812         }
 813
 814         /*
 815          * Probe delay is used to update the NAV, cf. 11.1.3.2.2
 816          * (which unfortunately doesn't say _why_ step a) is done,
 817          * but it waits for the probe delay or until a frame is
 818          * received - and the received frame would update the NAV).
 819          * For now, we do not support waiting until a frame is
 820          * received.
 821          *
 822          * In any case, it is not necessary for a passive scan.
 823          */
 824         if ((chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR)) ||
 825             !scan_req->n_ssids) {
 826                 *next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
 827                 local->next_scan_state = SCAN_DECISION;
 828                 return;
 829         }
 830
 831         /* active scan, send probes */
 832         *next_delay = IEEE80211_PROBE_DELAY;
 833         local->next_scan_state = SCAN_SEND_PROBE;
 834 }
 835
 836 static void ieee80211_scan_state_suspend(struct ieee80211_local *local,
 837                                          unsigned long *next_delay)
 838 {
 839         /* switch back to the operating channel */
 840         local->scan_chandef.chan = NULL;
 841         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
 842
 843         /* disable PS */
 844         ieee80211_offchannel_return(local);
 845
 846         *next_delay = HZ / 5;
 847         /* afterwards, resume scan & go to next channel */
 848         local->next_scan_state = SCAN_RESUME;
 849 }
 850
 851 static void ieee80211_scan_state_resume(struct ieee80211_local *local,
 852                                         unsigned long *next_delay)
 853 {
 854         ieee80211_offchannel_stop_vifs(local);
 855
 856         if (local->ops->flush) {
 857                 ieee80211_flush_queues(local, NULL, false);
 858                 *next_delay = 0;
 859         } else
 860                 *next_delay = HZ / 10;
 861
 862         /* remember when we left the operating channel */
 863         local->leave_oper_channel_time = jiffies;
 864
 865         /* advance to the next channel to be scanned */
 866         local->next_scan_state = SCAN_SET_CHANNEL;
 867 }
 868
 869 void ieee80211_scan_work(struct work_struct *work)
 870 {
 871         struct ieee80211_local *local =
 872                 container_of(work, struct ieee80211_local, scan_work.work);
 873         struct ieee80211_sub_if_data *sdata;
 874         struct cfg80211_scan_request *scan_req;
 875         unsigned long next_delay = 0;
 876         bool aborted;
 877
 878         mutex_lock(&local->mtx);
 879
 880         if (!ieee80211_can_run_worker(local)) {
 881                 aborted = true;
 882                 goto out_complete;
 883         }
 884
 885         sdata = rcu_dereference_protected(local->scan_sdata,
 886                                           lockdep_is_held(&local->mtx));
 887         scan_req = rcu_dereference_protected(local->scan_req,
 888                                              lockdep_is_held(&local->mtx));
 889
 890         /* When scanning on-channel, the first-callback means completed. */
 891         if (test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning)) {
 892                 aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning);
 893                 goto out_complete;
 894         }
 895
 896         if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) {
 897                 aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning);
 898                 goto out_complete;
 899         }
 900
 901         if (!sdata || !scan_req)
 902                 goto out;
 903
 904         if (!local->scanning) {
 905                 int rc;
 906
 907                 RCU_INIT_POINTER(local->scan_req, NULL);
 908                 RCU_INIT_POINTER(local->scan_sdata, NULL);
 909
 910                 rc = __ieee80211_start_scan(sdata, scan_req);
 911                 if (rc) {
 912                         /* need to complete scan in cfg80211 */
 913                         rcu_assign_pointer(local->scan_req, scan_req);
 914                         aborted = true;
 915                         goto out_complete;
 916                 } else
 917                         goto out;
 918         }
 919
 920         /*
 921          * as long as no delay is required advance immediately
 922          * without scheduling a new work
 923          */
 924         do {
 925                 if (!ieee80211_sdata_running(sdata)) {
 926                         aborted = true;
 927                         goto out_complete;
 928                 }
 929
 930                 switch (local->next_scan_state) {
 931                 case SCAN_DECISION:
 932                         /* if no more bands/channels left, complete scan */
 933                         if (local->scan_channel_idx >= scan_req->n_channels) {
 934                                 aborted = false;
 935                                 goto out_complete;
 936                         }
 937                         ieee80211_scan_state_decision(local, &next_delay);
 938                         break;
 939                 case SCAN_SET_CHANNEL:
 940                         ieee80211_scan_state_set_channel(local, &next_delay);
 941                         break;
 942                 case SCAN_SEND_PROBE:
 943                         ieee80211_scan_state_send_probe(local, &next_delay);
 944                         break;
 945                 case SCAN_SUSPEND:
 946                         ieee80211_scan_state_suspend(local, &next_delay);
 947                         break;
 948                 case SCAN_RESUME:
 949                         ieee80211_scan_state_resume(local, &next_delay);
 950                         break;
 951                 case SCAN_ABORT:
 952                         aborted = true;
 953                         goto out_complete;
 954                 }
 955         } while (next_delay == 0);
 956
 957         ieee80211_queue_delayed_work(&local->hw, &local->scan_work, next_delay);
 958         goto out;
 959
 960 out_complete:
 961         __ieee80211_scan_completed(&local->hw, aborted);
 962 out:
 963         mutex_unlock(&local->mtx);
 964 }
 965
 966 int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata,
 967                            struct cfg80211_scan_request *req)
 968 {
 969         int res;
 970
 971         mutex_lock(&sdata->local->mtx);
 972         res = __ieee80211_start_scan(sdata, req);
 973         mutex_unlock(&sdata->local->mtx);
 974
 975         return res;
 976 }
 977
 978 int ieee80211_request_ibss_scan(struct ieee80211_sub_if_data *sdata,
 979                                 const u8 *ssid, u8 ssid_len,
 980                                 struct ieee80211_channel **channels,
 981                                 unsigned int n_channels,
 982                                 enum nl80211_bss_scan_width scan_width)
 983 {
 984         struct ieee80211_local *local = sdata->local;
 985         int ret = -EBUSY, i, n_ch = 0;
 986         enum nl80211_band band;
 987
 988         mutex_lock(&local->mtx);
 989
 990         /* busy scanning */
 991         if (local->scan_req)
 992                 goto unlock;
 993
 994         /* fill internal scan request */
 995         if (!channels) {
 996                 int max_n;
 997
 998                 for (band = 0; band < NUM_NL80211_BANDS; band++) {
 999                         if (!local->hw.wiphy->bands[band])
1000                                 continue;
1001
1002                         max_n = local->hw.wiphy->bands[band]->n_channels;
1003                         for (i = 0; i < max_n; i++) {
1004                                 struct ieee80211_channel *tmp_ch =
1005                                     &local->hw.wiphy->bands[band]->channels[i];
1006
1007                                 if (tmp_ch->flags & (IEEE80211_CHAN_NO_IR |
1008                                                      IEEE80211_CHAN_DISABLED))
1009                                         continue;
1010
1011                                 local->int_scan_req->channels[n_ch] = tmp_ch;
1012                                 n_ch++;
1013                         }
1014                 }
1015
1016                 if (WARN_ON_ONCE(n_ch == 0))
1017                         goto unlock;
1018
1019                 local->int_scan_req->n_channels = n_ch;
1020         } else {
1021                 for (i = 0; i < n_channels; i++) {
1022                         if (channels[i]->flags & (IEEE80211_CHAN_NO_IR |
1023                                                   IEEE80211_CHAN_DISABLED))
1024                                 continue;
1025
1026                         local->int_scan_req->channels[n_ch] = channels[i];
1027                         n_ch++;
1028                 }
1029
1030                 if (WARN_ON_ONCE(n_ch == 0))
1031                         goto unlock;
1032
1033                 local->int_scan_req->n_channels = n_ch;
1034         }
1035
1036         local->int_scan_req->ssids = &local->scan_ssid;
1037         local->int_scan_req->n_ssids = 1;
1038         local->int_scan_req->scan_width = scan_width;
1039         memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN);
1040         local->int_scan_req->ssids[0].ssid_len = ssid_len;
1041
1042         ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req);
1043  unlock:
1044         mutex_unlock(&local->mtx);
1045         return ret;
1046 }
1047
1048 /*
1049  * Only call this function when a scan can't be queued -- under RTNL.
1050  */
1051 void ieee80211_scan_cancel(struct ieee80211_local *local)
1052 {
1053         /*
1054          * We are canceling software scan, or deferred scan that was not
1055          * yet really started (see __ieee80211_start_scan ).
1056          *
1057          * Regarding hardware scan:
1058          * - we can not call  __ieee80211_scan_completed() as when
1059          *   SCAN_HW_SCANNING bit is set this function change
1060          *   local->hw_scan_req to operate on 5G band, what race with
1061          *   driver which can use local->hw_scan_req
1062          *
1063          * - we can not cancel scan_work since driver can schedule it
1064          *   by ieee80211_scan_completed(..., true) to finish scan
1065          *
1066          * Hence we only call the cancel_hw_scan() callback, but the low-level
1067          * driver is still responsible for calling ieee80211_scan_completed()
1068          * after the scan was completed/aborted.
1069          */
1070
1071         mutex_lock(&local->mtx);
1072         if (!local->scan_req)
1073                 goto out;
1074
1075         /*
1076          * We have a scan running and the driver already reported completion,
1077          * but the worker hasn't run yet or is stuck on the mutex - mark it as
1078          * cancelled.
1079          */
1080         if (test_bit(SCAN_HW_SCANNING, &local->scanning) &&
1081             test_bit(SCAN_COMPLETED, &local->scanning)) {
1082                 set_bit(SCAN_HW_CANCELLED, &local->scanning);
1083                 goto out;
1084         }
1085
1086         if (test_bit(SCAN_HW_SCANNING, &local->scanning)) {
1087                 /*
1088                  * Make sure that __ieee80211_scan_completed doesn't trigger a
1089                  * scan on another band.
1090                  */
1091                 set_bit(SCAN_HW_CANCELLED, &local->scanning);
1092                 if (local->ops->cancel_hw_scan)
1093                         drv_cancel_hw_scan(local,
1094                                 rcu_dereference_protected(local->scan_sdata,
1095                                                 lockdep_is_held(&local->mtx)));
1096                 goto out;
1097         }
1098
1099         /*
1100          * If the work is currently running, it must be blocked on
1101          * the mutex, but we'll set scan_sdata = NULL and it'll
1102          * simply exit once it acquires the mutex.
1103          */
1104         cancel_delayed_work(&local->scan_work);
1105         /* and clean up */
1106         memset(&local->scan_info, 0, sizeof(local->scan_info));
1107         __ieee80211_scan_completed(&local->hw, true);
1108 out:
1109         mutex_unlock(&local->mtx);
1110 }
1111
1112 int __ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata,
1113                                         struct cfg80211_sched_scan_request *req)
1114 {
1115         struct ieee80211_local *local = sdata->local;
1116         struct ieee80211_scan_ies sched_scan_ies = {};
1117         struct cfg80211_chan_def chandef;
1118         int ret, i, iebufsz, num_bands = 0;
1119         u32 rate_masks[NUM_NL80211_BANDS] = {};
1120         u8 bands_used = 0;
1121         u8 *ie;
1122         size_t len;
1123
1124         iebufsz = local->scan_ies_len + req->ie_len;
1125
1126         lockdep_assert_held(&local->mtx);
1127
1128         if (!local->ops->sched_scan_start)
1129                 return -ENOTSUPP;
1130
1131         for (i = 0; i < NUM_NL80211_BANDS; i++) {
1132                 if (local->hw.wiphy->bands[i]) {
1133                         bands_used |= BIT(i);
1134                         rate_masks[i] = (u32) -1;
1135                         num_bands++;
1136                 }
1137         }
1138
1139         ie = kzalloc(num_bands * iebufsz, GFP_KERNEL);
1140         if (!ie) {
1141                 ret = -ENOMEM;
1142                 goto out;
1143         }
1144
1145         ieee80211_prepare_scan_chandef(&chandef, req->scan_width);
1146
1147         len = ieee80211_build_preq_ies(local, ie, num_bands * iebufsz,
1148                                        &sched_scan_ies, req->ie,
1149                                        req->ie_len, bands_used,
1150                                        rate_masks, &chandef);
1151
1152         ret = drv_sched_scan_start(local, sdata, req, &sched_scan_ies);
1153         if (ret == 0) {
1154                 rcu_assign_pointer(local->sched_scan_sdata, sdata);
1155                 rcu_assign_pointer(local->sched_scan_req, req);
1156         }
1157
1158         kfree(ie);
1159
1160 out:
1161         if (ret) {
1162                 /* Clean in case of failure after HW restart or upon resume. */
1163                 RCU_INIT_POINTER(local->sched_scan_sdata, NULL);
1164                 RCU_INIT_POINTER(local->sched_scan_req, NULL);
1165         }
1166
1167         return ret;
1168 }
1169
1170 int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata,
1171                                        struct cfg80211_sched_scan_request *req)
1172 {
1173         struct ieee80211_local *local = sdata->local;
1174         int ret;
1175
1176         mutex_lock(&local->mtx);
1177
1178         if (rcu_access_pointer(local->sched_scan_sdata)) {
1179                 mutex_unlock(&local->mtx);
1180                 return -EBUSY;
1181         }
1182
1183         ret = __ieee80211_request_sched_scan_start(sdata, req);
1184
1185         mutex_unlock(&local->mtx);
1186         return ret;
1187 }
1188
1189 int ieee80211_request_sched_scan_stop(struct ieee80211_local *local)
1190 {
1191         struct ieee80211_sub_if_data *sched_scan_sdata;
1192         int ret = -ENOENT;
1193
1194         mutex_lock(&local->mtx);
1195
1196         if (!local->ops->sched_scan_stop) {
1197                 ret = -ENOTSUPP;
1198                 goto out;
1199         }
1200
1201         /* We don't want to restart sched scan anymore. */
1202         RCU_INIT_POINTER(local->sched_scan_req, NULL);
1203
1204         sched_scan_sdata = rcu_dereference_protected(local->sched_scan_sdata,
1205                                                 lockdep_is_held(&local->mtx));
1206         if (sched_scan_sdata) {
1207                 ret = drv_sched_scan_stop(local, sched_scan_sdata);
1208                 if (!ret)
1209                         RCU_INIT_POINTER(local->sched_scan_sdata, NULL);
1210         }
1211 out:
1212         mutex_unlock(&local->mtx);
1213
1214         return ret;
1215 }
1216
1217 void ieee80211_sched_scan_results(struct ieee80211_hw *hw)
1218 {
1219         struct ieee80211_local *local = hw_to_local(hw);
1220
1221         trace_api_sched_scan_results(local);
1222
1223         cfg80211_sched_scan_results(hw->wiphy);
1224 }
1225 EXPORT_SYMBOL(ieee80211_sched_scan_results);
1226
1227 void ieee80211_sched_scan_end(struct ieee80211_local *local)
1228 {
1229         mutex_lock(&local->mtx);
1230
1231         if (!rcu_access_pointer(local->sched_scan_sdata)) {
1232                 mutex_unlock(&local->mtx);
1233                 return;
1234         }
1235
1236         RCU_INIT_POINTER(local->sched_scan_sdata, NULL);
1237
1238         /* If sched scan was aborted by the driver. */
1239         RCU_INIT_POINTER(local->sched_scan_req, NULL);
1240
1241         mutex_unlock(&local->mtx);
1242
1243         cfg80211_sched_scan_stopped(local->hw.wiphy);
1244 }
1245
1246 void ieee80211_sched_scan_stopped_work(struct work_struct *work)
1247 {
1248         struct ieee80211_local *local =
1249                 container_of(work, struct ieee80211_local,
1250                              sched_scan_stopped_work);
1251
1252         ieee80211_sched_scan_end(local);
1253 }
1254
1255 void ieee80211_sched_scan_stopped(struct ieee80211_hw *hw)
1256 {
1257         struct ieee80211_local *local = hw_to_local(hw);
1258
1259         trace_api_sched_scan_stopped(local);
1260
1261         /*
1262          * this shouldn't really happen, so for simplicity
1263          * simply ignore it, and let mac80211 reconfigure
1264          * the sched scan later on.
1265          */
1266         if (local->in_reconfig)
1267                 return;
1268
1269         schedule_work(&local->sched_scan_stopped_work);
1270 }
1271 EXPORT_SYMBOL(ieee80211_sched_scan_stopped);