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 2016-2017  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 (rx_status->flag & RX_FLAG_NO_SIGNAL_VAL)
  77                 bss_meta.signal = 0; /* invalid signal indication */
  78         else if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
  79                 bss_meta.signal = rx_status->signal * 100;
  80         else if (ieee80211_hw_check(&local->hw, SIGNAL_UNSPEC))
  81                 bss_meta.signal = (rx_status->signal * 100) / local->hw.max_signal;
  82
  83         bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_20;
  84         if (rx_status->bw == RATE_INFO_BW_5)
  85                 bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_5;
  86         else if (rx_status->bw == RATE_INFO_BW_10)
  87                 bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_10;
  88
  89         bss_meta.chan = channel;
  90
  91         rcu_read_lock();
  92         scan_sdata = rcu_dereference(local->scan_sdata);
  93         if (scan_sdata && scan_sdata->vif.type == NL80211_IFTYPE_STATION &&
  94             scan_sdata->vif.bss_conf.assoc &&
  95             ieee80211_have_rx_timestamp(rx_status)) {
  96                 bss_meta.parent_tsf =
  97                         ieee80211_calculate_rx_timestamp(local, rx_status,
  98                                                          len + FCS_LEN, 24);
  99                 ether_addr_copy(bss_meta.parent_bssid,
 100                                 scan_sdata->vif.bss_conf.bssid);
 101         }
 102         rcu_read_unlock();
 103
 104         cbss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta,
 105                                               mgmt, len, GFP_ATOMIC);
 106         if (!cbss)
 107                 return NULL;
 108         /* In case the signal is invalid update the status */
 109         signal_valid = abs(channel->center_freq - cbss->channel->center_freq)
 110                 <= local->hw.wiphy->max_adj_channel_rssi_comp;
 111         if (!signal_valid)
 112                 rx_status->flag |= RX_FLAG_NO_SIGNAL_VAL;
 113
 114         bss = (void *)cbss->priv;
 115
 116         if (beacon)
 117                 bss->device_ts_beacon = rx_status->device_timestamp;
 118         else
 119                 bss->device_ts_presp = rx_status->device_timestamp;
 120
 121         if (elems->parse_error) {
 122                 if (beacon)
 123                         bss->corrupt_data |= IEEE80211_BSS_CORRUPT_BEACON;
 124                 else
 125                         bss->corrupt_data |= IEEE80211_BSS_CORRUPT_PROBE_RESP;
 126         } else {
 127                 if (beacon)
 128                         bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_BEACON;
 129                 else
 130                         bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_PROBE_RESP;
 131         }
 132
 133         /* save the ERP value so that it is available at association time */
 134         if (elems->erp_info && (!elems->parse_error ||
 135                                 !(bss->valid_data & IEEE80211_BSS_VALID_ERP))) {
 136                 bss->erp_value = elems->erp_info[0];
 137                 bss->has_erp_value = true;
 138                 if (!elems->parse_error)
 139                         bss->valid_data |= IEEE80211_BSS_VALID_ERP;
 140         }
 141
 142         /* replace old supported rates if we get new values */
 143         if (!elems->parse_error ||
 144             !(bss->valid_data & IEEE80211_BSS_VALID_RATES)) {
 145                 srlen = 0;
 146                 if (elems->supp_rates) {
 147                         clen = IEEE80211_MAX_SUPP_RATES;
 148                         if (clen > elems->supp_rates_len)
 149                                 clen = elems->supp_rates_len;
 150                         memcpy(bss->supp_rates, elems->supp_rates, clen);
 151                         srlen += clen;
 152                 }
 153                 if (elems->ext_supp_rates) {
 154                         clen = IEEE80211_MAX_SUPP_RATES - srlen;
 155                         if (clen > elems->ext_supp_rates_len)
 156                                 clen = elems->ext_supp_rates_len;
 157                         memcpy(bss->supp_rates + srlen, elems->ext_supp_rates,
 158                                clen);
 159                         srlen += clen;
 160                 }
 161                 if (srlen) {
 162                         bss->supp_rates_len = srlen;
 163                         if (!elems->parse_error)
 164                                 bss->valid_data |= IEEE80211_BSS_VALID_RATES;
 165                 }
 166         }
 167
 168         if (!elems->parse_error ||
 169             !(bss->valid_data & IEEE80211_BSS_VALID_WMM)) {
 170                 bss->wmm_used = elems->wmm_param || elems->wmm_info;
 171                 bss->uapsd_supported = is_uapsd_supported(elems);
 172                 if (!elems->parse_error)
 173                         bss->valid_data |= IEEE80211_BSS_VALID_WMM;
 174         }
 175
 176         if (beacon) {
 177                 struct ieee80211_supported_band *sband =
 178                         local->hw.wiphy->bands[rx_status->band];
 179                 if (!(rx_status->encoding == RX_ENC_HT) &&
 180                     !(rx_status->encoding == RX_ENC_VHT))
 181                         bss->beacon_rate =
 182                                 &sband->bitrates[rx_status->rate_idx];
 183         }
 184
 185         return bss;
 186 }
 187
 188 static bool ieee80211_scan_accept_presp(struct ieee80211_sub_if_data *sdata,
 189                                         u32 scan_flags, const u8 *da)
 190 {
 191         if (!sdata)
 192                 return false;
 193         /* accept broadcast for OCE */
 194         if (scan_flags & NL80211_SCAN_FLAG_ACCEPT_BCAST_PROBE_RESP &&
 195             is_broadcast_ether_addr(da))
 196                 return true;
 197         if (scan_flags & NL80211_SCAN_FLAG_RANDOM_ADDR)
 198                 return true;
 199         return ether_addr_equal(da, sdata->vif.addr);
 200 }
 201
 202 void ieee80211_scan_rx(struct ieee80211_local *local, struct sk_buff *skb)
 203 {
 204         struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
 205         struct ieee80211_sub_if_data *sdata1, *sdata2;
 206         struct ieee80211_mgmt *mgmt = (void *)skb->data;
 207         struct ieee80211_bss *bss;
 208         u8 *elements;
 209         struct ieee80211_channel *channel;
 210         size_t baselen;
 211         struct ieee802_11_elems elems;
 212
 213         if (skb->len < 24 ||
 214             (!ieee80211_is_probe_resp(mgmt->frame_control) &&
 215              !ieee80211_is_beacon(mgmt->frame_control)))
 216                 return;
 217
 218         sdata1 = rcu_dereference(local->scan_sdata);
 219         sdata2 = rcu_dereference(local->sched_scan_sdata);
 220
 221         if (likely(!sdata1 && !sdata2))
 222                 return;
 223
 224         if (ieee80211_is_probe_resp(mgmt->frame_control)) {
 225                 struct cfg80211_scan_request *scan_req;
 226                 struct cfg80211_sched_scan_request *sched_scan_req;
 227                 u32 scan_req_flags = 0, sched_scan_req_flags = 0;
 228
 229                 scan_req = rcu_dereference(local->scan_req);
 230                 sched_scan_req = rcu_dereference(local->sched_scan_req);
 231
 232                 if (scan_req)
 233                         scan_req_flags = scan_req->flags;
 234
 235                 if (sched_scan_req)
 236                         sched_scan_req_flags = sched_scan_req->flags;
 237
 238                 /* ignore ProbeResp to foreign address or non-bcast (OCE)
 239                  * unless scanning with randomised address
 240                  */
 241                 if (!ieee80211_scan_accept_presp(sdata1, scan_req_flags,
 242                                                  mgmt->da) &&
 243                     !ieee80211_scan_accept_presp(sdata2, sched_scan_req_flags,
 244                                                  mgmt->da))
 245                         return;
 246
 247                 elements = mgmt->u.probe_resp.variable;
 248                 baselen = offsetof(struct ieee80211_mgmt, u.probe_resp.variable);
 249         } else {
 250                 baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable);
 251                 elements = mgmt->u.beacon.variable;
 252         }
 253
 254         if (baselen > skb->len)
 255                 return;
 256
 257         ieee802_11_parse_elems(elements, skb->len - baselen, false, &elems);
 258
 259         channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
 260
 261         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
 262                 return;
 263
 264         bss = ieee80211_bss_info_update(local, rx_status,
 265                                         mgmt, skb->len, &elems,
 266                                         channel);
 267         if (bss)
 268                 ieee80211_rx_bss_put(local, bss);
 269 }
 270
 271 static void
 272 ieee80211_prepare_scan_chandef(struct cfg80211_chan_def *chandef,
 273                                enum nl80211_bss_scan_width scan_width)
 274 {
 275         memset(chandef, 0, sizeof(*chandef));
 276         switch (scan_width) {
 277         case NL80211_BSS_CHAN_WIDTH_5:
 278                 chandef->width = NL80211_CHAN_WIDTH_5;
 279                 break;
 280         case NL80211_BSS_CHAN_WIDTH_10:
 281                 chandef->width = NL80211_CHAN_WIDTH_10;
 282                 break;
 283         default:
 284                 chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
 285                 break;
 286         }
 287 }
 288
 289 /* return false if no more work */
 290 static bool ieee80211_prep_hw_scan(struct ieee80211_local *local)
 291 {
 292         struct cfg80211_scan_request *req;
 293         struct cfg80211_chan_def chandef;
 294         u8 bands_used = 0;
 295         int i, ielen, n_chans;
 296
 297         req = rcu_dereference_protected(local->scan_req,
 298                                         lockdep_is_held(&local->mtx));
 299
 300         if (test_bit(SCAN_HW_CANCELLED, &local->scanning))
 301                 return false;
 302
 303         if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) {
 304                 for (i = 0; i < req->n_channels; i++) {
 305                         local->hw_scan_req->req.channels[i] = req->channels[i];
 306                         bands_used |= BIT(req->channels[i]->band);
 307                 }
 308
 309                 n_chans = req->n_channels;
 310         } else {
 311                 do {
 312                         if (local->hw_scan_band == NUM_NL80211_BANDS)
 313                                 return false;
 314
 315                         n_chans = 0;
 316
 317                         for (i = 0; i < req->n_channels; i++) {
 318                                 if (req->channels[i]->band !=
 319                                     local->hw_scan_band)
 320                                         continue;
 321                                 local->hw_scan_req->req.channels[n_chans] =
 322                                                         req->channels[i];
 323                                 n_chans++;
 324                                 bands_used |= BIT(req->channels[i]->band);
 325                         }
 326
 327                         local->hw_scan_band++;
 328                 } while (!n_chans);
 329         }
 330
 331         local->hw_scan_req->req.n_channels = n_chans;
 332         ieee80211_prepare_scan_chandef(&chandef, req->scan_width);
 333
 334         ielen = ieee80211_build_preq_ies(local,
 335                                          (u8 *)local->hw_scan_req->req.ie,
 336                                          local->hw_scan_ies_bufsize,
 337                                          &local->hw_scan_req->ies,
 338                                          req->ie, req->ie_len,
 339                                          bands_used, req->rates, &chandef);
 340         local->hw_scan_req->req.ie_len = ielen;
 341         local->hw_scan_req->req.no_cck = req->no_cck;
 342         ether_addr_copy(local->hw_scan_req->req.mac_addr, req->mac_addr);
 343         ether_addr_copy(local->hw_scan_req->req.mac_addr_mask,
 344                         req->mac_addr_mask);
 345         ether_addr_copy(local->hw_scan_req->req.bssid, req->bssid);
 346
 347         return true;
 348 }
 349
 350 static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted)
 351 {
 352         struct ieee80211_local *local = hw_to_local(hw);
 353         bool hw_scan = local->ops->hw_scan;
 354         bool was_scanning = local->scanning;
 355         struct cfg80211_scan_request *scan_req;
 356         struct ieee80211_sub_if_data *scan_sdata;
 357         struct ieee80211_sub_if_data *sdata;
 358
 359         lockdep_assert_held(&local->mtx);
 360
 361         /*
 362          * It's ok to abort a not-yet-running scan (that
 363          * we have one at all will be verified by checking
 364          * local->scan_req next), but not to complete it
 365          * successfully.
 366          */
 367         if (WARN_ON(!local->scanning && !aborted))
 368                 aborted = true;
 369
 370         if (WARN_ON(!local->scan_req))
 371                 return;
 372
 373         if (hw_scan && !aborted &&
 374             !ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS) &&
 375             ieee80211_prep_hw_scan(local)) {
 376                 int rc;
 377
 378                 rc = drv_hw_scan(local,
 379                         rcu_dereference_protected(local->scan_sdata,
 380                                                   lockdep_is_held(&local->mtx)),
 381                         local->hw_scan_req);
 382
 383                 if (rc == 0)
 384                         return;
 385
 386                 /* HW scan failed and is going to be reported as aborted,
 387                  * so clear old scan info.
 388                  */
 389                 memset(&local->scan_info, 0, sizeof(local->scan_info));
 390                 aborted = true;
 391         }
 392
 393         kfree(local->hw_scan_req);
 394         local->hw_scan_req = NULL;
 395
 396         scan_req = rcu_dereference_protected(local->scan_req,
 397                                              lockdep_is_held(&local->mtx));
 398
 399         if (scan_req != local->int_scan_req) {
 400                 local->scan_info.aborted = aborted;
 401                 cfg80211_scan_done(scan_req, &local->scan_info);
 402         }
 403         RCU_INIT_POINTER(local->scan_req, NULL);
 404
 405         scan_sdata = rcu_dereference_protected(local->scan_sdata,
 406                                                lockdep_is_held(&local->mtx));
 407         RCU_INIT_POINTER(local->scan_sdata, NULL);
 408
 409         local->scanning = 0;
 410         local->scan_chandef.chan = NULL;
 411
 412         /* Set power back to normal operating levels. */
 413         ieee80211_hw_config(local, 0);
 414
 415         if (!hw_scan) {
 416                 ieee80211_configure_filter(local);
 417                 drv_sw_scan_complete(local, scan_sdata);
 418                 ieee80211_offchannel_return(local);
 419         }
 420
 421         ieee80211_recalc_idle(local);
 422
 423         ieee80211_mlme_notify_scan_completed(local);
 424         ieee80211_ibss_notify_scan_completed(local);
 425
 426         /* Requeue all the work that might have been ignored while
 427          * the scan was in progress; if there was none this will
 428          * just be a no-op for the particular interface.
 429          */
 430         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 431                 if (ieee80211_sdata_running(sdata))
 432                         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 433         }
 434
 435         if (was_scanning)
 436                 ieee80211_start_next_roc(local);
 437 }
 438
 439 void ieee80211_scan_completed(struct ieee80211_hw *hw,
 440                               struct cfg80211_scan_info *info)
 441 {
 442         struct ieee80211_local *local = hw_to_local(hw);
 443
 444         trace_api_scan_completed(local, info->aborted);
 445
 446         set_bit(SCAN_COMPLETED, &local->scanning);
 447         if (info->aborted)
 448                 set_bit(SCAN_ABORTED, &local->scanning);
 449
 450         memcpy(&local->scan_info, info, sizeof(*info));
 451
 452         ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0);
 453 }
 454 EXPORT_SYMBOL(ieee80211_scan_completed);
 455
 456 static int ieee80211_start_sw_scan(struct ieee80211_local *local,
 457                                    struct ieee80211_sub_if_data *sdata)
 458 {
 459         /* Software scan is not supported in multi-channel cases */
 460         if (local->use_chanctx)
 461                 return -EOPNOTSUPP;
 462
 463         /*
 464          * Hardware/driver doesn't support hw_scan, so use software
 465          * scanning instead. First send a nullfunc frame with power save
 466          * bit on so that AP will buffer the frames for us while we are not
 467          * listening, then send probe requests to each channel and wait for
 468          * the responses. After all channels are scanned, tune back to the
 469          * original channel and send a nullfunc frame with power save bit
 470          * off to trigger the AP to send us all the buffered frames.
 471          *
 472          * Note that while local->sw_scanning is true everything else but
 473          * nullfunc frames and probe requests will be dropped in
 474          * ieee80211_tx_h_check_assoc().
 475          */
 476         drv_sw_scan_start(local, sdata, local->scan_addr);
 477
 478         local->leave_oper_channel_time = jiffies;
 479         local->next_scan_state = SCAN_DECISION;
 480         local->scan_channel_idx = 0;
 481
 482         ieee80211_offchannel_stop_vifs(local);
 483
 484         /* ensure nullfunc is transmitted before leaving operating channel */
 485         ieee80211_flush_queues(local, NULL, false);
 486
 487         ieee80211_configure_filter(local);
 488
 489         /* We need to set power level at maximum rate for scanning. */
 490         ieee80211_hw_config(local, 0);
 491
 492         ieee80211_queue_delayed_work(&local->hw,
 493                                      &local->scan_work, 0);
 494
 495         return 0;
 496 }
 497
 498 static bool ieee80211_can_scan(struct ieee80211_local *local,
 499                                struct ieee80211_sub_if_data *sdata)
 500 {
 501         if (ieee80211_is_radar_required(local))
 502                 return false;
 503
 504         if (!list_empty(&local->roc_list))
 505                 return false;
 506
 507         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
 508             sdata->u.mgd.flags & IEEE80211_STA_CONNECTION_POLL)
 509                 return false;
 510
 511         return true;
 512 }
 513
 514 void ieee80211_run_deferred_scan(struct ieee80211_local *local)
 515 {
 516         lockdep_assert_held(&local->mtx);
 517
 518         if (!local->scan_req || local->scanning)
 519                 return;
 520
 521         if (!ieee80211_can_scan(local,
 522                                 rcu_dereference_protected(
 523                                         local->scan_sdata,
 524                                         lockdep_is_held(&local->mtx))))
 525                 return;
 526
 527         ieee80211_queue_delayed_work(&local->hw, &local->scan_work,
 528                                      round_jiffies_relative(0));
 529 }
 530
 531 static void ieee80211_scan_state_send_probe(struct ieee80211_local *local,
 532                                             unsigned long *next_delay)
 533 {
 534         int i;
 535         struct ieee80211_sub_if_data *sdata;
 536         struct cfg80211_scan_request *scan_req;
 537         enum nl80211_band band = local->hw.conf.chandef.chan->band;
 538         u32 tx_flags;
 539
 540         scan_req = rcu_dereference_protected(local->scan_req,
 541                                              lockdep_is_held(&local->mtx));
 542
 543         tx_flags = IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
 544         if (scan_req->no_cck)
 545                 tx_flags |= IEEE80211_TX_CTL_NO_CCK_RATE;
 546
 547         sdata = rcu_dereference_protected(local->scan_sdata,
 548                                           lockdep_is_held(&local->mtx));
 549
 550         for (i = 0; i < scan_req->n_ssids; i++)
 551                 ieee80211_send_probe_req(
 552                         sdata, local->scan_addr, scan_req->bssid,
 553                         scan_req->ssids[i].ssid, scan_req->ssids[i].ssid_len,
 554                         scan_req->ie, scan_req->ie_len,
 555                         scan_req->rates[band], false,
 556                         tx_flags, local->hw.conf.chandef.chan, true);
 557
 558         /*
 559          * After sending probe requests, wait for probe responses
 560          * on the channel.
 561          */
 562         *next_delay = IEEE80211_CHANNEL_TIME;
 563         local->next_scan_state = SCAN_DECISION;
 564 }
 565
 566 static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata,
 567                                   struct cfg80211_scan_request *req)
 568 {
 569         struct ieee80211_local *local = sdata->local;
 570         int rc;
 571
 572         lockdep_assert_held(&local->mtx);
 573
 574         if (local->scan_req || ieee80211_is_radar_required(local))
 575                 return -EBUSY;
 576
 577         if (!ieee80211_can_scan(local, sdata)) {
 578                 /* wait for the work to finish/time out */
 579                 rcu_assign_pointer(local->scan_req, req);
 580                 rcu_assign_pointer(local->scan_sdata, sdata);
 581                 return 0;
 582         }
 583
 584         if (local->ops->hw_scan) {
 585                 u8 *ies;
 586
 587                 local->hw_scan_ies_bufsize = local->scan_ies_len + req->ie_len;
 588
 589                 if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) {
 590                         int i, n_bands = 0;
 591                         u8 bands_counted = 0;
 592
 593                         for (i = 0; i < req->n_channels; i++) {
 594                                 if (bands_counted & BIT(req->channels[i]->band))
 595                                         continue;
 596                                 bands_counted |= BIT(req->channels[i]->band);
 597                                 n_bands++;
 598                         }
 599
 600                         local->hw_scan_ies_bufsize *= n_bands;
 601                 }
 602
 603                 local->hw_scan_req = kmalloc(
 604                                 sizeof(*local->hw_scan_req) +
 605                                 req->n_channels * sizeof(req->channels[0]) +
 606                                 local->hw_scan_ies_bufsize, GFP_KERNEL);
 607                 if (!local->hw_scan_req)
 608                         return -ENOMEM;
 609
 610                 local->hw_scan_req->req.ssids = req->ssids;
 611                 local->hw_scan_req->req.n_ssids = req->n_ssids;
 612                 ies = (u8 *)local->hw_scan_req +
 613                         sizeof(*local->hw_scan_req) +
 614                         req->n_channels * sizeof(req->channels[0]);
 615                 local->hw_scan_req->req.ie = ies;
 616                 local->hw_scan_req->req.flags = req->flags;
 617                 eth_broadcast_addr(local->hw_scan_req->req.bssid);
 618                 local->hw_scan_req->req.duration = req->duration;
 619                 local->hw_scan_req->req.duration_mandatory =
 620                         req->duration_mandatory;
 621
 622                 local->hw_scan_band = 0;
 623
 624                 /*
 625                  * After allocating local->hw_scan_req, we must
 626                  * go through until ieee80211_prep_hw_scan(), so
 627                  * anything that might be changed here and leave
 628                  * this function early must not go after this
 629                  * allocation.
 630                  */
 631         }
 632
 633         rcu_assign_pointer(local->scan_req, req);
 634         rcu_assign_pointer(local->scan_sdata, sdata);
 635
 636         if (req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR)
 637                 get_random_mask_addr(local->scan_addr,
 638                                      req->mac_addr,
 639                                      req->mac_addr_mask);
 640         else
 641                 memcpy(local->scan_addr, sdata->vif.addr, ETH_ALEN);
 642
 643         if (local->ops->hw_scan) {
 644                 __set_bit(SCAN_HW_SCANNING, &local->scanning);
 645         } else if ((req->n_channels == 1) &&
 646                    (req->channels[0] == local->_oper_chandef.chan)) {
 647                 /*
 648                  * If we are scanning only on the operating channel
 649                  * then we do not need to stop normal activities
 650                  */
 651                 unsigned long next_delay;
 652
 653                 __set_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
 654
 655                 ieee80211_recalc_idle(local);
 656
 657                 /* Notify driver scan is starting, keep order of operations
 658                  * same as normal software scan, in case that matters. */
 659                 drv_sw_scan_start(local, sdata, local->scan_addr);
 660
 661                 ieee80211_configure_filter(local); /* accept probe-responses */
 662
 663                 /* We need to ensure power level is at max for scanning. */
 664                 ieee80211_hw_config(local, 0);
 665
 666                 if ((req->channels[0]->flags & (IEEE80211_CHAN_NO_IR |
 667                                                 IEEE80211_CHAN_RADAR)) ||
 668                     !req->n_ssids) {
 669                         next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
 670                 } else {
 671                         ieee80211_scan_state_send_probe(local, &next_delay);
 672                         next_delay = IEEE80211_CHANNEL_TIME;
 673                 }
 674
 675                 /* Now, just wait a bit and we are all done! */
 676                 ieee80211_queue_delayed_work(&local->hw, &local->scan_work,
 677                                              next_delay);
 678                 return 0;
 679         } else {
 680                 /* Do normal software scan */
 681                 __set_bit(SCAN_SW_SCANNING, &local->scanning);
 682         }
 683
 684         ieee80211_recalc_idle(local);
 685
 686         if (local->ops->hw_scan) {
 687                 WARN_ON(!ieee80211_prep_hw_scan(local));
 688                 rc = drv_hw_scan(local, sdata, local->hw_scan_req);
 689         } else {
 690                 rc = ieee80211_start_sw_scan(local, sdata);
 691         }
 692
 693         if (rc) {
 694                 kfree(local->hw_scan_req);
 695                 local->hw_scan_req = NULL;
 696                 local->scanning = 0;
 697
 698                 ieee80211_recalc_idle(local);
 699
 700                 local->scan_req = NULL;
 701                 RCU_INIT_POINTER(local->scan_sdata, NULL);
 702         }
 703
 704         return rc;
 705 }
 706
 707 static unsigned long
 708 ieee80211_scan_get_channel_time(struct ieee80211_channel *chan)
 709 {
 710         /*
 711          * TODO: channel switching also consumes quite some time,
 712          * add that delay as well to get a better estimation
 713          */
 714         if (chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR))
 715                 return IEEE80211_PASSIVE_CHANNEL_TIME;
 716         return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME;
 717 }
 718
 719 static void ieee80211_scan_state_decision(struct ieee80211_local *local,
 720                                           unsigned long *next_delay)
 721 {
 722         bool associated = false;
 723         bool tx_empty = true;
 724         bool bad_latency;
 725         struct ieee80211_sub_if_data *sdata;
 726         struct ieee80211_channel *next_chan;
 727         enum mac80211_scan_state next_scan_state;
 728         struct cfg80211_scan_request *scan_req;
 729
 730         /*
 731          * check if at least one STA interface is associated,
 732          * check if at least one STA interface has pending tx frames
 733          * and grab the lowest used beacon interval
 734          */
 735         mutex_lock(&local->iflist_mtx);
 736         list_for_each_entry(sdata, &local->interfaces, list) {
 737                 if (!ieee80211_sdata_running(sdata))
 738                         continue;
 739
 740                 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 741                         if (sdata->u.mgd.associated) {
 742                                 associated = true;
 743
 744                                 if (!qdisc_all_tx_empty(sdata->dev)) {
 745                                         tx_empty = false;
 746                                         break;
 747                                 }
 748                         }
 749                 }
 750         }
 751         mutex_unlock(&local->iflist_mtx);
 752
 753         scan_req = rcu_dereference_protected(local->scan_req,
 754                                              lockdep_is_held(&local->mtx));
 755
 756         next_chan = scan_req->channels[local->scan_channel_idx];
 757
 758         /*
 759          * we're currently scanning a different channel, let's
 760          * see if we can scan another channel without interfering
 761          * with the current traffic situation.
 762          *
 763          * Keep good latency, do not stay off-channel more than 125 ms.
 764          */
 765
 766         bad_latency = time_after(jiffies +
 767                                  ieee80211_scan_get_channel_time(next_chan),
 768                                  local->leave_oper_channel_time + HZ / 8);
 769
 770         if (associated && !tx_empty) {
 771                 if (scan_req->flags & NL80211_SCAN_FLAG_LOW_PRIORITY)
 772                         next_scan_state = SCAN_ABORT;
 773                 else
 774                         next_scan_state = SCAN_SUSPEND;
 775         } else if (associated && bad_latency) {
 776                 next_scan_state = SCAN_SUSPEND;
 777         } else {
 778                 next_scan_state = SCAN_SET_CHANNEL;
 779         }
 780
 781         local->next_scan_state = next_scan_state;
 782
 783         *next_delay = 0;
 784 }
 785
 786 static void ieee80211_scan_state_set_channel(struct ieee80211_local *local,
 787                                              unsigned long *next_delay)
 788 {
 789         int skip;
 790         struct ieee80211_channel *chan;
 791         enum nl80211_bss_scan_width oper_scan_width;
 792         struct cfg80211_scan_request *scan_req;
 793
 794         scan_req = rcu_dereference_protected(local->scan_req,
 795                                              lockdep_is_held(&local->mtx));
 796
 797         skip = 0;
 798         chan = scan_req->channels[local->scan_channel_idx];
 799
 800         local->scan_chandef.chan = chan;
 801         local->scan_chandef.center_freq1 = chan->center_freq;
 802         local->scan_chandef.center_freq2 = 0;
 803         switch (scan_req->scan_width) {
 804         case NL80211_BSS_CHAN_WIDTH_5:
 805                 local->scan_chandef.width = NL80211_CHAN_WIDTH_5;
 806                 break;
 807         case NL80211_BSS_CHAN_WIDTH_10:
 808                 local->scan_chandef.width = NL80211_CHAN_WIDTH_10;
 809                 break;
 810         case NL80211_BSS_CHAN_WIDTH_20:
 811                 /* If scanning on oper channel, use whatever channel-type
 812                  * is currently in use.
 813                  */
 814                 oper_scan_width = cfg80211_chandef_to_scan_width(
 815                                         &local->_oper_chandef);
 816                 if (chan == local->_oper_chandef.chan &&
 817                     oper_scan_width == scan_req->scan_width)
 818                         local->scan_chandef = local->_oper_chandef;
 819                 else
 820                         local->scan_chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
 821                 break;
 822         }
 823
 824         if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL))
 825                 skip = 1;
 826
 827         /* advance state machine to next channel/band */
 828         local->scan_channel_idx++;
 829
 830         if (skip) {
 831                 /* if we skip this channel return to the decision state */
 832                 local->next_scan_state = SCAN_DECISION;
 833                 return;
 834         }
 835
 836         /*
 837          * Probe delay is used to update the NAV, cf. 11.1.3.2.2
 838          * (which unfortunately doesn't say _why_ step a) is done,
 839          * but it waits for the probe delay or until a frame is
 840          * received - and the received frame would update the NAV).
 841          * For now, we do not support waiting until a frame is
 842          * received.
 843          *
 844          * In any case, it is not necessary for a passive scan.
 845          */
 846         if ((chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR)) ||
 847             !scan_req->n_ssids) {
 848                 *next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
 849                 local->next_scan_state = SCAN_DECISION;
 850                 return;
 851         }
 852
 853         /* active scan, send probes */
 854         *next_delay = IEEE80211_PROBE_DELAY;
 855         local->next_scan_state = SCAN_SEND_PROBE;
 856 }
 857
 858 static void ieee80211_scan_state_suspend(struct ieee80211_local *local,
 859                                          unsigned long *next_delay)
 860 {
 861         /* switch back to the operating channel */
 862         local->scan_chandef.chan = NULL;
 863         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
 864
 865         /* disable PS */
 866         ieee80211_offchannel_return(local);
 867
 868         *next_delay = HZ / 5;
 869         /* afterwards, resume scan & go to next channel */
 870         local->next_scan_state = SCAN_RESUME;
 871 }
 872
 873 static void ieee80211_scan_state_resume(struct ieee80211_local *local,
 874                                         unsigned long *next_delay)
 875 {
 876         ieee80211_offchannel_stop_vifs(local);
 877
 878         if (local->ops->flush) {
 879                 ieee80211_flush_queues(local, NULL, false);
 880                 *next_delay = 0;
 881         } else
 882                 *next_delay = HZ / 10;
 883
 884         /* remember when we left the operating channel */
 885         local->leave_oper_channel_time = jiffies;
 886
 887         /* advance to the next channel to be scanned */
 888         local->next_scan_state = SCAN_SET_CHANNEL;
 889 }
 890
 891 void ieee80211_scan_work(struct work_struct *work)
 892 {
 893         struct ieee80211_local *local =
 894                 container_of(work, struct ieee80211_local, scan_work.work);
 895         struct ieee80211_sub_if_data *sdata;
 896         struct cfg80211_scan_request *scan_req;
 897         unsigned long next_delay = 0;
 898         bool aborted;
 899
 900         mutex_lock(&local->mtx);
 901
 902         if (!ieee80211_can_run_worker(local)) {
 903                 aborted = true;
 904                 goto out_complete;
 905         }
 906
 907         sdata = rcu_dereference_protected(local->scan_sdata,
 908                                           lockdep_is_held(&local->mtx));
 909         scan_req = rcu_dereference_protected(local->scan_req,
 910                                              lockdep_is_held(&local->mtx));
 911
 912         /* When scanning on-channel, the first-callback means completed. */
 913         if (test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning)) {
 914                 aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning);
 915                 goto out_complete;
 916         }
 917
 918         if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) {
 919                 aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning);
 920                 goto out_complete;
 921         }
 922
 923         if (!sdata || !scan_req)
 924                 goto out;
 925
 926         if (!local->scanning) {
 927                 int rc;
 928
 929                 RCU_INIT_POINTER(local->scan_req, NULL);
 930                 RCU_INIT_POINTER(local->scan_sdata, NULL);
 931
 932                 rc = __ieee80211_start_scan(sdata, scan_req);
 933                 if (rc) {
 934                         /* need to complete scan in cfg80211 */
 935                         rcu_assign_pointer(local->scan_req, scan_req);
 936                         aborted = true;
 937                         goto out_complete;
 938                 } else
 939                         goto out;
 940         }
 941
 942         /*
 943          * as long as no delay is required advance immediately
 944          * without scheduling a new work
 945          */
 946         do {
 947                 if (!ieee80211_sdata_running(sdata)) {
 948                         aborted = true;
 949                         goto out_complete;
 950                 }
 951
 952                 switch (local->next_scan_state) {
 953                 case SCAN_DECISION:
 954                         /* if no more bands/channels left, complete scan */
 955                         if (local->scan_channel_idx >= scan_req->n_channels) {
 956                                 aborted = false;
 957                                 goto out_complete;
 958                         }
 959                         ieee80211_scan_state_decision(local, &next_delay);
 960                         break;
 961                 case SCAN_SET_CHANNEL:
 962                         ieee80211_scan_state_set_channel(local, &next_delay);
 963                         break;
 964                 case SCAN_SEND_PROBE:
 965                         ieee80211_scan_state_send_probe(local, &next_delay);
 966                         break;
 967                 case SCAN_SUSPEND:
 968                         ieee80211_scan_state_suspend(local, &next_delay);
 969                         break;
 970                 case SCAN_RESUME:
 971                         ieee80211_scan_state_resume(local, &next_delay);
 972                         break;
 973                 case SCAN_ABORT:
 974                         aborted = true;
 975                         goto out_complete;
 976                 }
 977         } while (next_delay == 0);
 978
 979         ieee80211_queue_delayed_work(&local->hw, &local->scan_work, next_delay);
 980         goto out;
 981
 982 out_complete:
 983         __ieee80211_scan_completed(&local->hw, aborted);
 984 out:
 985         mutex_unlock(&local->mtx);
 986 }
 987
 988 int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata,
 989                            struct cfg80211_scan_request *req)
 990 {
 991         int res;
 992
 993         mutex_lock(&sdata->local->mtx);
 994         res = __ieee80211_start_scan(sdata, req);
 995         mutex_unlock(&sdata->local->mtx);
 996
 997         return res;
 998 }
 999
1000 int ieee80211_request_ibss_scan(struct ieee80211_sub_if_data *sdata,
1001                                 const u8 *ssid, u8 ssid_len,
1002                                 struct ieee80211_channel **channels,
1003                                 unsigned int n_channels,
1004                                 enum nl80211_bss_scan_width scan_width)
1005 {
1006         struct ieee80211_local *local = sdata->local;
1007         int ret = -EBUSY, i, n_ch = 0;
1008         enum nl80211_band band;
1009
1010         mutex_lock(&local->mtx);
1011
1012         /* busy scanning */
1013         if (local->scan_req)
1014                 goto unlock;
1015
1016         /* fill internal scan request */
1017         if (!channels) {
1018                 int max_n;
1019
1020                 for (band = 0; band < NUM_NL80211_BANDS; band++) {
1021                         if (!local->hw.wiphy->bands[band])
1022                                 continue;
1023
1024                         max_n = local->hw.wiphy->bands[band]->n_channels;
1025                         for (i = 0; i < max_n; i++) {
1026                                 struct ieee80211_channel *tmp_ch =
1027                                     &local->hw.wiphy->bands[band]->channels[i];
1028
1029                                 if (tmp_ch->flags & (IEEE80211_CHAN_NO_IR |
1030                                                      IEEE80211_CHAN_DISABLED))
1031                                         continue;
1032
1033                                 local->int_scan_req->channels[n_ch] = tmp_ch;
1034                                 n_ch++;
1035                         }
1036                 }
1037
1038                 if (WARN_ON_ONCE(n_ch == 0))
1039                         goto unlock;
1040
1041                 local->int_scan_req->n_channels = n_ch;
1042         } else {
1043                 for (i = 0; i < n_channels; i++) {
1044                         if (channels[i]->flags & (IEEE80211_CHAN_NO_IR |
1045                                                   IEEE80211_CHAN_DISABLED))
1046                                 continue;
1047
1048                         local->int_scan_req->channels[n_ch] = channels[i];
1049                         n_ch++;
1050                 }
1051
1052                 if (WARN_ON_ONCE(n_ch == 0))
1053                         goto unlock;
1054
1055                 local->int_scan_req->n_channels = n_ch;
1056         }
1057
1058         local->int_scan_req->ssids = &local->scan_ssid;
1059         local->int_scan_req->n_ssids = 1;
1060         local->int_scan_req->scan_width = scan_width;
1061         memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN);
1062         local->int_scan_req->ssids[0].ssid_len = ssid_len;
1063
1064         ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req);
1065  unlock:
1066         mutex_unlock(&local->mtx);
1067         return ret;
1068 }
1069
1070 /*
1071  * Only call this function when a scan can't be queued -- under RTNL.
1072  */
1073 void ieee80211_scan_cancel(struct ieee80211_local *local)
1074 {
1075         /*
1076          * We are canceling software scan, or deferred scan that was not
1077          * yet really started (see __ieee80211_start_scan ).
1078          *
1079          * Regarding hardware scan:
1080          * - we can not call  __ieee80211_scan_completed() as when
1081          *   SCAN_HW_SCANNING bit is set this function change
1082          *   local->hw_scan_req to operate on 5G band, what race with
1083          *   driver which can use local->hw_scan_req
1084          *
1085          * - we can not cancel scan_work since driver can schedule it
1086          *   by ieee80211_scan_completed(..., true) to finish scan
1087          *
1088          * Hence we only call the cancel_hw_scan() callback, but the low-level
1089          * driver is still responsible for calling ieee80211_scan_completed()
1090          * after the scan was completed/aborted.
1091          */
1092
1093         mutex_lock(&local->mtx);
1094         if (!local->scan_req)
1095                 goto out;
1096
1097         /*
1098          * We have a scan running and the driver already reported completion,
1099          * but the worker hasn't run yet or is stuck on the mutex - mark it as
1100          * cancelled.
1101          */
1102         if (test_bit(SCAN_HW_SCANNING, &local->scanning) &&
1103             test_bit(SCAN_COMPLETED, &local->scanning)) {
1104                 set_bit(SCAN_HW_CANCELLED, &local->scanning);
1105                 goto out;
1106         }
1107
1108         if (test_bit(SCAN_HW_SCANNING, &local->scanning)) {
1109                 /*
1110                  * Make sure that __ieee80211_scan_completed doesn't trigger a
1111                  * scan on another band.
1112                  */
1113                 set_bit(SCAN_HW_CANCELLED, &local->scanning);
1114                 if (local->ops->cancel_hw_scan)
1115                         drv_cancel_hw_scan(local,
1116                                 rcu_dereference_protected(local->scan_sdata,
1117                                                 lockdep_is_held(&local->mtx)));
1118                 goto out;
1119         }
1120
1121         /*
1122          * If the work is currently running, it must be blocked on
1123          * the mutex, but we'll set scan_sdata = NULL and it'll
1124          * simply exit once it acquires the mutex.
1125          */
1126         cancel_delayed_work(&local->scan_work);
1127         /* and clean up */
1128         memset(&local->scan_info, 0, sizeof(local->scan_info));
1129         __ieee80211_scan_completed(&local->hw, true);
1130 out:
1131         mutex_unlock(&local->mtx);
1132 }
1133
1134 int __ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata,
1135                                         struct cfg80211_sched_scan_request *req)
1136 {
1137         struct ieee80211_local *local = sdata->local;
1138         struct ieee80211_scan_ies sched_scan_ies = {};
1139         struct cfg80211_chan_def chandef;
1140         int ret, i, iebufsz, num_bands = 0;
1141         u32 rate_masks[NUM_NL80211_BANDS] = {};
1142         u8 bands_used = 0;
1143         u8 *ie;
1144
1145         iebufsz = local->scan_ies_len + req->ie_len;
1146
1147         lockdep_assert_held(&local->mtx);
1148
1149         if (!local->ops->sched_scan_start)
1150                 return -ENOTSUPP;
1151
1152         for (i = 0; i < NUM_NL80211_BANDS; i++) {
1153                 if (local->hw.wiphy->bands[i]) {
1154                         bands_used |= BIT(i);
1155                         rate_masks[i] = (u32) -1;
1156                         num_bands++;
1157                 }
1158         }
1159
1160         ie = kzalloc(num_bands * iebufsz, GFP_KERNEL);
1161         if (!ie) {
1162                 ret = -ENOMEM;
1163                 goto out;
1164         }
1165
1166         ieee80211_prepare_scan_chandef(&chandef, req->scan_width);
1167
1168         ieee80211_build_preq_ies(local, ie, num_bands * iebufsz,
1169                                  &sched_scan_ies, req->ie,
1170                                  req->ie_len, bands_used, rate_masks, &chandef);
1171
1172         ret = drv_sched_scan_start(local, sdata, req, &sched_scan_ies);
1173         if (ret == 0) {
1174                 rcu_assign_pointer(local->sched_scan_sdata, sdata);
1175                 rcu_assign_pointer(local->sched_scan_req, req);
1176         }
1177
1178         kfree(ie);
1179
1180 out:
1181         if (ret) {
1182                 /* Clean in case of failure after HW restart or upon resume. */
1183                 RCU_INIT_POINTER(local->sched_scan_sdata, NULL);
1184                 RCU_INIT_POINTER(local->sched_scan_req, NULL);
1185         }
1186
1187         return ret;
1188 }
1189
1190 int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata,
1191                                        struct cfg80211_sched_scan_request *req)
1192 {
1193         struct ieee80211_local *local = sdata->local;
1194         int ret;
1195
1196         mutex_lock(&local->mtx);
1197
1198         if (rcu_access_pointer(local->sched_scan_sdata)) {
1199                 mutex_unlock(&local->mtx);
1200                 return -EBUSY;
1201         }
1202
1203         ret = __ieee80211_request_sched_scan_start(sdata, req);
1204
1205         mutex_unlock(&local->mtx);
1206         return ret;
1207 }
1208
1209 int ieee80211_request_sched_scan_stop(struct ieee80211_local *local)
1210 {
1211         struct ieee80211_sub_if_data *sched_scan_sdata;
1212         int ret = -ENOENT;
1213
1214         mutex_lock(&local->mtx);
1215
1216         if (!local->ops->sched_scan_stop) {
1217                 ret = -ENOTSUPP;
1218                 goto out;
1219         }
1220
1221         /* We don't want to restart sched scan anymore. */
1222         RCU_INIT_POINTER(local->sched_scan_req, NULL);
1223
1224         sched_scan_sdata = rcu_dereference_protected(local->sched_scan_sdata,
1225                                                 lockdep_is_held(&local->mtx));
1226         if (sched_scan_sdata) {
1227                 ret = drv_sched_scan_stop(local, sched_scan_sdata);
1228                 if (!ret)
1229                         RCU_INIT_POINTER(local->sched_scan_sdata, NULL);
1230         }
1231 out:
1232         mutex_unlock(&local->mtx);
1233
1234         return ret;
1235 }
1236
1237 void ieee80211_sched_scan_results(struct ieee80211_hw *hw)
1238 {
1239         struct ieee80211_local *local = hw_to_local(hw);
1240
1241         trace_api_sched_scan_results(local);
1242
1243         cfg80211_sched_scan_results(hw->wiphy, 0);
1244 }
1245 EXPORT_SYMBOL(ieee80211_sched_scan_results);
1246
1247 void ieee80211_sched_scan_end(struct ieee80211_local *local)
1248 {
1249         mutex_lock(&local->mtx);
1250
1251         if (!rcu_access_pointer(local->sched_scan_sdata)) {
1252                 mutex_unlock(&local->mtx);
1253                 return;
1254         }
1255
1256         RCU_INIT_POINTER(local->sched_scan_sdata, NULL);
1257
1258         /* If sched scan was aborted by the driver. */
1259         RCU_INIT_POINTER(local->sched_scan_req, NULL);
1260
1261         mutex_unlock(&local->mtx);
1262
1263         cfg80211_sched_scan_stopped(local->hw.wiphy, 0);
1264 }
1265
1266 void ieee80211_sched_scan_stopped_work(struct work_struct *work)
1267 {
1268         struct ieee80211_local *local =
1269                 container_of(work, struct ieee80211_local,
1270                              sched_scan_stopped_work);
1271
1272         ieee80211_sched_scan_end(local);
1273 }
1274
1275 void ieee80211_sched_scan_stopped(struct ieee80211_hw *hw)
1276 {
1277         struct ieee80211_local *local = hw_to_local(hw);
1278
1279         trace_api_sched_scan_stopped(local);
1280
1281         /*
1282          * this shouldn't really happen, so for simplicity
1283          * simply ignore it, and let mac80211 reconfigure
1284          * the sched scan later on.
1285          */
1286         if (local->in_reconfig)
1287                 return;
1288
1289         schedule_work(&local->sched_scan_stopped_work);
1290 }
1291 EXPORT_SYMBOL(ieee80211_sched_scan_stopped);