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TOMOYO Linux Cross Reference
Linux/net/mac80211/scan.c

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  1 /*
  2  * Scanning implementation
  3  *
  4  * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
  5  * Copyright 2004, Instant802 Networks, Inc.
  6  * Copyright 2005, Devicescape Software, Inc.
  7  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
  8  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
  9  * Copyright 2013-2015  Intel Mobile Communications GmbH
 10  * Copyright 2016  Intel Deutschland GmbH
 11  *
 12  * This program is free software; you can redistribute it and/or modify
 13  * it under the terms of the GNU General Public License version 2 as
 14  * published by the Free Software Foundation.
 15  */
 16 
 17 #include <linux/if_arp.h>
 18 #include <linux/etherdevice.h>
 19 #include <linux/rtnetlink.h>
 20 #include <net/sch_generic.h>
 21 #include <linux/slab.h>
 22 #include <linux/export.h>
 23 #include <net/mac80211.h>
 24 
 25 #include "ieee80211_i.h"
 26 #include "driver-ops.h"
 27 #include "mesh.h"
 28 
 29 #define IEEE80211_PROBE_DELAY (HZ / 33)
 30 #define IEEE80211_CHANNEL_TIME (HZ / 33)
 31 #define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 9)
 32 
 33 void ieee80211_rx_bss_put(struct ieee80211_local *local,
 34                           struct ieee80211_bss *bss)
 35 {
 36         if (!bss)
 37                 return;
 38         cfg80211_put_bss(local->hw.wiphy,
 39                          container_of((void *)bss, struct cfg80211_bss, priv));
 40 }
 41 
 42 static bool is_uapsd_supported(struct ieee802_11_elems *elems)
 43 {
 44         u8 qos_info;
 45 
 46         if (elems->wmm_info && elems->wmm_info_len == 7
 47             && elems->wmm_info[5] == 1)
 48                 qos_info = elems->wmm_info[6];
 49         else if (elems->wmm_param && elems->wmm_param_len == 24
 50                  && elems->wmm_param[5] == 1)
 51                 qos_info = elems->wmm_param[6];
 52         else
 53                 /* no valid wmm information or parameter element found */
 54                 return false;
 55 
 56         return qos_info & IEEE80211_WMM_IE_AP_QOSINFO_UAPSD;
 57 }
 58 
 59 struct ieee80211_bss *
 60 ieee80211_bss_info_update(struct ieee80211_local *local,
 61                           struct ieee80211_rx_status *rx_status,
 62                           struct ieee80211_mgmt *mgmt, size_t len,
 63                           struct ieee802_11_elems *elems,
 64                           struct ieee80211_channel *channel)
 65 {
 66         bool beacon = ieee80211_is_beacon(mgmt->frame_control);
 67         struct cfg80211_bss *cbss;
 68         struct ieee80211_bss *bss;
 69         int clen, srlen;
 70         struct cfg80211_inform_bss bss_meta = {
 71                 .boottime_ns = rx_status->boottime_ns,
 72         };
 73         bool signal_valid;
 74         struct ieee80211_sub_if_data *scan_sdata;
 75 
 76         if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
 77                 bss_meta.signal = rx_status->signal * 100;
 78         else if (ieee80211_hw_check(&local->hw, SIGNAL_UNSPEC))
 79                 bss_meta.signal = (rx_status->signal * 100) / local->hw.max_signal;
 80 
 81         bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_20;
 82         if (rx_status->flag & RX_FLAG_5MHZ)
 83                 bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_5;
 84         if (rx_status->flag & RX_FLAG_10MHZ)
 85                 bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_10;
 86 
 87         bss_meta.chan = channel;
 88 
 89         rcu_read_lock();
 90         scan_sdata = rcu_dereference(local->scan_sdata);
 91         if (scan_sdata && scan_sdata->vif.type == NL80211_IFTYPE_STATION &&
 92             scan_sdata->vif.bss_conf.assoc &&
 93             ieee80211_have_rx_timestamp(rx_status)) {
 94                 bss_meta.parent_tsf =
 95                         ieee80211_calculate_rx_timestamp(local, rx_status,
 96                                                          len + FCS_LEN, 24);
 97                 ether_addr_copy(bss_meta.parent_bssid,
 98                                 scan_sdata->vif.bss_conf.bssid);
 99         }
100         rcu_read_unlock();
101 
102         cbss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta,
103                                               mgmt, len, GFP_ATOMIC);
104         if (!cbss)
105                 return NULL;
106         /* In case the signal is invalid update the status */
107         signal_valid = abs(channel->center_freq - cbss->channel->center_freq)
108                 <= local->hw.wiphy->max_adj_channel_rssi_comp;
109         if (!signal_valid)
110                 rx_status->flag |= RX_FLAG_NO_SIGNAL_VAL;
111 
112         bss = (void *)cbss->priv;
113 
114         if (beacon)
115                 bss->device_ts_beacon = rx_status->device_timestamp;
116         else
117                 bss->device_ts_presp = rx_status->device_timestamp;
118 
119         if (elems->parse_error) {
120                 if (beacon)
121                         bss->corrupt_data |= IEEE80211_BSS_CORRUPT_BEACON;
122                 else
123                         bss->corrupt_data |= IEEE80211_BSS_CORRUPT_PROBE_RESP;
124         } else {
125                 if (beacon)
126                         bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_BEACON;
127                 else
128                         bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_PROBE_RESP;
129         }
130 
131         /* save the ERP value so that it is available at association time */
132         if (elems->erp_info && (!elems->parse_error ||
133                                 !(bss->valid_data & IEEE80211_BSS_VALID_ERP))) {
134                 bss->erp_value = elems->erp_info[0];
135                 bss->has_erp_value = true;
136                 if (!elems->parse_error)
137                         bss->valid_data |= IEEE80211_BSS_VALID_ERP;
138         }
139 
140         /* replace old supported rates if we get new values */
141         if (!elems->parse_error ||
142             !(bss->valid_data & IEEE80211_BSS_VALID_RATES)) {
143                 srlen = 0;
144                 if (elems->supp_rates) {
145                         clen = IEEE80211_MAX_SUPP_RATES;
146                         if (clen > elems->supp_rates_len)
147                                 clen = elems->supp_rates_len;
148                         memcpy(bss->supp_rates, elems->supp_rates, clen);
149                         srlen += clen;
150                 }
151                 if (elems->ext_supp_rates) {
152                         clen = IEEE80211_MAX_SUPP_RATES - srlen;
153                         if (clen > elems->ext_supp_rates_len)
154                                 clen = elems->ext_supp_rates_len;
155                         memcpy(bss->supp_rates + srlen, elems->ext_supp_rates,
156                                clen);
157                         srlen += clen;
158                 }
159                 if (srlen) {
160                         bss->supp_rates_len = srlen;
161                         if (!elems->parse_error)
162                                 bss->valid_data |= IEEE80211_BSS_VALID_RATES;
163                 }
164         }
165 
166         if (!elems->parse_error ||
167             !(bss->valid_data & IEEE80211_BSS_VALID_WMM)) {
168                 bss->wmm_used = elems->wmm_param || elems->wmm_info;
169                 bss->uapsd_supported = is_uapsd_supported(elems);
170                 if (!elems->parse_error)
171                         bss->valid_data |= IEEE80211_BSS_VALID_WMM;
172         }
173 
174         if (beacon) {
175                 struct ieee80211_supported_band *sband =
176                         local->hw.wiphy->bands[rx_status->band];
177                 if (!(rx_status->flag & RX_FLAG_HT) &&
178                     !(rx_status->flag & RX_FLAG_VHT))
179                         bss->beacon_rate =
180                                 &sband->bitrates[rx_status->rate_idx];
181         }
182 
183         return bss;
184 }
185 
186 void ieee80211_scan_rx(struct ieee80211_local *local, struct sk_buff *skb)
187 {
188         struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
189         struct ieee80211_sub_if_data *sdata1, *sdata2;
190         struct ieee80211_mgmt *mgmt = (void *)skb->data;
191         struct ieee80211_bss *bss;
192         u8 *elements;
193         struct ieee80211_channel *channel;
194         size_t baselen;
195         struct ieee802_11_elems elems;
196 
197         if (skb->len < 24 ||
198             (!ieee80211_is_probe_resp(mgmt->frame_control) &&
199              !ieee80211_is_beacon(mgmt->frame_control)))
200                 return;
201 
202         sdata1 = rcu_dereference(local->scan_sdata);
203         sdata2 = rcu_dereference(local->sched_scan_sdata);
204 
205         if (likely(!sdata1 && !sdata2))
206                 return;
207 
208         if (ieee80211_is_probe_resp(mgmt->frame_control)) {
209                 struct cfg80211_scan_request *scan_req;
210                 struct cfg80211_sched_scan_request *sched_scan_req;
211 
212                 scan_req = rcu_dereference(local->scan_req);
213                 sched_scan_req = rcu_dereference(local->sched_scan_req);
214 
215                 /* ignore ProbeResp to foreign address unless scanning
216                  * with randomised address
217                  */
218                 if (!(sdata1 &&
219                       (ether_addr_equal(mgmt->da, sdata1->vif.addr) ||
220                        scan_req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR)) &&
221                     !(sdata2 &&
222                       (ether_addr_equal(mgmt->da, sdata2->vif.addr) ||
223                        sched_scan_req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR)))
224                         return;
225 
226                 elements = mgmt->u.probe_resp.variable;
227                 baselen = offsetof(struct ieee80211_mgmt, u.probe_resp.variable);
228         } else {
229                 baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable);
230                 elements = mgmt->u.beacon.variable;
231         }
232 
233         if (baselen > skb->len)
234                 return;
235 
236         ieee802_11_parse_elems(elements, skb->len - baselen, false, &elems);
237 
238         channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
239 
240         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
241                 return;
242 
243         bss = ieee80211_bss_info_update(local, rx_status,
244                                         mgmt, skb->len, &elems,
245                                         channel);
246         if (bss)
247                 ieee80211_rx_bss_put(local, bss);
248 }
249 
250 static void
251 ieee80211_prepare_scan_chandef(struct cfg80211_chan_def *chandef,
252                                enum nl80211_bss_scan_width scan_width)
253 {
254         memset(chandef, 0, sizeof(*chandef));
255         switch (scan_width) {
256         case NL80211_BSS_CHAN_WIDTH_5:
257                 chandef->width = NL80211_CHAN_WIDTH_5;
258                 break;
259         case NL80211_BSS_CHAN_WIDTH_10:
260                 chandef->width = NL80211_CHAN_WIDTH_10;
261                 break;
262         default:
263                 chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
264                 break;
265         }
266 }
267 
268 /* return false if no more work */
269 static bool ieee80211_prep_hw_scan(struct ieee80211_local *local)
270 {
271         struct cfg80211_scan_request *req;
272         struct cfg80211_chan_def chandef;
273         u8 bands_used = 0;
274         int i, ielen, n_chans;
275 
276         req = rcu_dereference_protected(local->scan_req,
277                                         lockdep_is_held(&local->mtx));
278 
279         if (test_bit(SCAN_HW_CANCELLED, &local->scanning))
280                 return false;
281 
282         if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) {
283                 for (i = 0; i < req->n_channels; i++) {
284                         local->hw_scan_req->req.channels[i] = req->channels[i];
285                         bands_used |= BIT(req->channels[i]->band);
286                 }
287 
288                 n_chans = req->n_channels;
289         } else {
290                 do {
291                         if (local->hw_scan_band == NUM_NL80211_BANDS)
292                                 return false;
293 
294                         n_chans = 0;
295 
296                         for (i = 0; i < req->n_channels; i++) {
297                                 if (req->channels[i]->band !=
298                                     local->hw_scan_band)
299                                         continue;
300                                 local->hw_scan_req->req.channels[n_chans] =
301                                                         req->channels[i];
302                                 n_chans++;
303                                 bands_used |= BIT(req->channels[i]->band);
304                         }
305 
306                         local->hw_scan_band++;
307                 } while (!n_chans);
308         }
309 
310         local->hw_scan_req->req.n_channels = n_chans;
311         ieee80211_prepare_scan_chandef(&chandef, req->scan_width);
312 
313         ielen = ieee80211_build_preq_ies(local,
314                                          (u8 *)local->hw_scan_req->req.ie,
315                                          local->hw_scan_ies_bufsize,
316                                          &local->hw_scan_req->ies,
317                                          req->ie, req->ie_len,
318                                          bands_used, req->rates, &chandef);
319         local->hw_scan_req->req.ie_len = ielen;
320         local->hw_scan_req->req.no_cck = req->no_cck;
321         ether_addr_copy(local->hw_scan_req->req.mac_addr, req->mac_addr);
322         ether_addr_copy(local->hw_scan_req->req.mac_addr_mask,
323                         req->mac_addr_mask);
324         ether_addr_copy(local->hw_scan_req->req.bssid, req->bssid);
325 
326         return true;
327 }
328 
329 static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted)
330 {
331         struct ieee80211_local *local = hw_to_local(hw);
332         bool hw_scan = local->ops->hw_scan;
333         bool was_scanning = local->scanning;
334         struct cfg80211_scan_request *scan_req;
335         struct ieee80211_sub_if_data *scan_sdata;
336         struct ieee80211_sub_if_data *sdata;
337 
338         lockdep_assert_held(&local->mtx);
339 
340         /*
341          * It's ok to abort a not-yet-running scan (that
342          * we have one at all will be verified by checking
343          * local->scan_req next), but not to complete it
344          * successfully.
345          */
346         if (WARN_ON(!local->scanning && !aborted))
347                 aborted = true;
348 
349         if (WARN_ON(!local->scan_req))
350                 return;
351 
352         if (hw_scan && !aborted &&
353             !ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS) &&
354             ieee80211_prep_hw_scan(local)) {
355                 int rc;
356 
357                 rc = drv_hw_scan(local,
358                         rcu_dereference_protected(local->scan_sdata,
359                                                   lockdep_is_held(&local->mtx)),
360                         local->hw_scan_req);
361 
362                 if (rc == 0)
363                         return;
364 
365                 /* HW scan failed and is going to be reported as aborted,
366                  * so clear old scan info.
367                  */
368                 memset(&local->scan_info, 0, sizeof(local->scan_info));
369                 aborted = true;
370         }
371 
372         kfree(local->hw_scan_req);
373         local->hw_scan_req = NULL;
374 
375         scan_req = rcu_dereference_protected(local->scan_req,
376                                              lockdep_is_held(&local->mtx));
377 
378         if (scan_req != local->int_scan_req) {
379                 local->scan_info.aborted = aborted;
380                 cfg80211_scan_done(scan_req, &local->scan_info);
381         }
382         RCU_INIT_POINTER(local->scan_req, NULL);
383 
384         scan_sdata = rcu_dereference_protected(local->scan_sdata,
385                                                lockdep_is_held(&local->mtx));
386         RCU_INIT_POINTER(local->scan_sdata, NULL);
387 
388         local->scanning = 0;
389         local->scan_chandef.chan = NULL;
390 
391         /* Set power back to normal operating levels. */
392         ieee80211_hw_config(local, 0);
393 
394         if (!hw_scan) {
395                 ieee80211_configure_filter(local);
396                 drv_sw_scan_complete(local, scan_sdata);
397                 ieee80211_offchannel_return(local);
398         }
399 
400         ieee80211_recalc_idle(local);
401 
402         ieee80211_mlme_notify_scan_completed(local);
403         ieee80211_ibss_notify_scan_completed(local);
404 
405         /* Requeue all the work that might have been ignored while
406          * the scan was in progress; if there was none this will
407          * just be a no-op for the particular interface.
408          */
409         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
410                 if (ieee80211_sdata_running(sdata))
411                         ieee80211_queue_work(&sdata->local->hw, &sdata->work);
412         }
413 
414         if (was_scanning)
415                 ieee80211_start_next_roc(local);
416 }
417 
418 void ieee80211_scan_completed(struct ieee80211_hw *hw,
419                               struct cfg80211_scan_info *info)
420 {
421         struct ieee80211_local *local = hw_to_local(hw);
422 
423         trace_api_scan_completed(local, info);
424 
425         set_bit(SCAN_COMPLETED, &local->scanning);
426         if (info->aborted)
427                 set_bit(SCAN_ABORTED, &local->scanning);
428 
429         memcpy(&local->scan_info, info, sizeof(*info));
430 
431         ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0);
432 }
433 EXPORT_SYMBOL(ieee80211_scan_completed);
434 
435 static int ieee80211_start_sw_scan(struct ieee80211_local *local,
436                                    struct ieee80211_sub_if_data *sdata)
437 {
438         /* Software scan is not supported in multi-channel cases */
439         if (local->use_chanctx)
440                 return -EOPNOTSUPP;
441 
442         /*
443          * Hardware/driver doesn't support hw_scan, so use software
444          * scanning instead. First send a nullfunc frame with power save
445          * bit on so that AP will buffer the frames for us while we are not
446          * listening, then send probe requests to each channel and wait for
447          * the responses. After all channels are scanned, tune back to the
448          * original channel and send a nullfunc frame with power save bit
449          * off to trigger the AP to send us all the buffered frames.
450          *
451          * Note that while local->sw_scanning is true everything else but
452          * nullfunc frames and probe requests will be dropped in
453          * ieee80211_tx_h_check_assoc().
454          */
455         drv_sw_scan_start(local, sdata, local->scan_addr);
456 
457         local->leave_oper_channel_time = jiffies;
458         local->next_scan_state = SCAN_DECISION;
459         local->scan_channel_idx = 0;
460 
461         ieee80211_offchannel_stop_vifs(local);
462 
463         /* ensure nullfunc is transmitted before leaving operating channel */
464         ieee80211_flush_queues(local, NULL, false);
465 
466         ieee80211_configure_filter(local);
467 
468         /* We need to set power level at maximum rate for scanning. */
469         ieee80211_hw_config(local, 0);
470 
471         ieee80211_queue_delayed_work(&local->hw,
472                                      &local->scan_work, 0);
473 
474         return 0;
475 }
476 
477 static bool ieee80211_can_scan(struct ieee80211_local *local,
478                                struct ieee80211_sub_if_data *sdata)
479 {
480         if (ieee80211_is_radar_required(local))
481                 return false;
482 
483         if (!list_empty(&local->roc_list))
484                 return false;
485 
486         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
487             sdata->u.mgd.flags & IEEE80211_STA_CONNECTION_POLL)
488                 return false;
489 
490         return true;
491 }
492 
493 void ieee80211_run_deferred_scan(struct ieee80211_local *local)
494 {
495         lockdep_assert_held(&local->mtx);
496 
497         if (!local->scan_req || local->scanning)
498                 return;
499 
500         if (!ieee80211_can_scan(local,
501                                 rcu_dereference_protected(
502                                         local->scan_sdata,
503                                         lockdep_is_held(&local->mtx))))
504                 return;
505 
506         ieee80211_queue_delayed_work(&local->hw, &local->scan_work,
507                                      round_jiffies_relative(0));
508 }
509 
510 static void ieee80211_scan_state_send_probe(struct ieee80211_local *local,
511                                             unsigned long *next_delay)
512 {
513         int i;
514         struct ieee80211_sub_if_data *sdata;
515         struct cfg80211_scan_request *scan_req;
516         enum nl80211_band band = local->hw.conf.chandef.chan->band;
517         u32 tx_flags;
518 
519         scan_req = rcu_dereference_protected(local->scan_req,
520                                              lockdep_is_held(&local->mtx));
521 
522         tx_flags = IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
523         if (scan_req->no_cck)
524                 tx_flags |= IEEE80211_TX_CTL_NO_CCK_RATE;
525 
526         sdata = rcu_dereference_protected(local->scan_sdata,
527                                           lockdep_is_held(&local->mtx));
528 
529         for (i = 0; i < scan_req->n_ssids; i++)
530                 ieee80211_send_probe_req(
531                         sdata, local->scan_addr, scan_req->bssid,
532                         scan_req->ssids[i].ssid, scan_req->ssids[i].ssid_len,
533                         scan_req->ie, scan_req->ie_len,
534                         scan_req->rates[band], false,
535                         tx_flags, local->hw.conf.chandef.chan, true);
536 
537         /*
538          * After sending probe requests, wait for probe responses
539          * on the channel.
540          */
541         *next_delay = IEEE80211_CHANNEL_TIME;
542         local->next_scan_state = SCAN_DECISION;
543 }
544 
545 static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata,
546                                   struct cfg80211_scan_request *req)
547 {
548         struct ieee80211_local *local = sdata->local;
549         int rc;
550 
551         lockdep_assert_held(&local->mtx);
552 
553         if (local->scan_req || ieee80211_is_radar_required(local))
554                 return -EBUSY;
555 
556         if (!ieee80211_can_scan(local, sdata)) {
557                 /* wait for the work to finish/time out */
558                 rcu_assign_pointer(local->scan_req, req);
559                 rcu_assign_pointer(local->scan_sdata, sdata);
560                 return 0;
561         }
562 
563         if (local->ops->hw_scan) {
564                 u8 *ies;
565 
566                 local->hw_scan_ies_bufsize = local->scan_ies_len + req->ie_len;
567 
568                 if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) {
569                         int i, n_bands = 0;
570                         u8 bands_counted = 0;
571 
572                         for (i = 0; i < req->n_channels; i++) {
573                                 if (bands_counted & BIT(req->channels[i]->band))
574                                         continue;
575                                 bands_counted |= BIT(req->channels[i]->band);
576                                 n_bands++;
577                         }
578 
579                         local->hw_scan_ies_bufsize *= n_bands;
580                 }
581 
582                 local->hw_scan_req = kmalloc(
583                                 sizeof(*local->hw_scan_req) +
584                                 req->n_channels * sizeof(req->channels[0]) +
585                                 local->hw_scan_ies_bufsize, GFP_KERNEL);
586                 if (!local->hw_scan_req)
587                         return -ENOMEM;
588 
589                 local->hw_scan_req->req.ssids = req->ssids;
590                 local->hw_scan_req->req.n_ssids = req->n_ssids;
591                 ies = (u8 *)local->hw_scan_req +
592                         sizeof(*local->hw_scan_req) +
593                         req->n_channels * sizeof(req->channels[0]);
594                 local->hw_scan_req->req.ie = ies;
595                 local->hw_scan_req->req.flags = req->flags;
596                 eth_broadcast_addr(local->hw_scan_req->req.bssid);
597                 local->hw_scan_req->req.duration = req->duration;
598                 local->hw_scan_req->req.duration_mandatory =
599                         req->duration_mandatory;
600 
601                 local->hw_scan_band = 0;
602 
603                 /*
604                  * After allocating local->hw_scan_req, we must
605                  * go through until ieee80211_prep_hw_scan(), so
606                  * anything that might be changed here and leave
607                  * this function early must not go after this
608                  * allocation.
609                  */
610         }
611 
612         rcu_assign_pointer(local->scan_req, req);
613         rcu_assign_pointer(local->scan_sdata, sdata);
614 
615         if (req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR)
616                 get_random_mask_addr(local->scan_addr,
617                                      req->mac_addr,
618                                      req->mac_addr_mask);
619         else
620                 memcpy(local->scan_addr, sdata->vif.addr, ETH_ALEN);
621 
622         if (local->ops->hw_scan) {
623                 __set_bit(SCAN_HW_SCANNING, &local->scanning);
624         } else if ((req->n_channels == 1) &&
625                    (req->channels[0] == local->_oper_chandef.chan)) {
626                 /*
627                  * If we are scanning only on the operating channel
628                  * then we do not need to stop normal activities
629                  */
630                 unsigned long next_delay;
631 
632                 __set_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
633 
634                 ieee80211_recalc_idle(local);
635 
636                 /* Notify driver scan is starting, keep order of operations
637                  * same as normal software scan, in case that matters. */
638                 drv_sw_scan_start(local, sdata, local->scan_addr);
639 
640                 ieee80211_configure_filter(local); /* accept probe-responses */
641 
642                 /* We need to ensure power level is at max for scanning. */
643                 ieee80211_hw_config(local, 0);
644 
645                 if ((req->channels[0]->flags & (IEEE80211_CHAN_NO_IR |
646                                                 IEEE80211_CHAN_RADAR)) ||
647                     !req->n_ssids) {
648                         next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
649                 } else {
650                         ieee80211_scan_state_send_probe(local, &next_delay);
651                         next_delay = IEEE80211_CHANNEL_TIME;
652                 }
653 
654                 /* Now, just wait a bit and we are all done! */
655                 ieee80211_queue_delayed_work(&local->hw, &local->scan_work,
656                                              next_delay);
657                 return 0;
658         } else {
659                 /* Do normal software scan */
660                 __set_bit(SCAN_SW_SCANNING, &local->scanning);
661         }
662 
663         ieee80211_recalc_idle(local);
664 
665         if (local->ops->hw_scan) {
666                 WARN_ON(!ieee80211_prep_hw_scan(local));
667                 rc = drv_hw_scan(local, sdata, local->hw_scan_req);
668         } else {
669                 rc = ieee80211_start_sw_scan(local, sdata);
670         }
671 
672         if (rc) {
673                 kfree(local->hw_scan_req);
674                 local->hw_scan_req = NULL;
675                 local->scanning = 0;
676 
677                 ieee80211_recalc_idle(local);
678 
679                 local->scan_req = NULL;
680                 RCU_INIT_POINTER(local->scan_sdata, NULL);
681         }
682 
683         return rc;
684 }
685 
686 static unsigned long
687 ieee80211_scan_get_channel_time(struct ieee80211_channel *chan)
688 {
689         /*
690          * TODO: channel switching also consumes quite some time,
691          * add that delay as well to get a better estimation
692          */
693         if (chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR))
694                 return IEEE80211_PASSIVE_CHANNEL_TIME;
695         return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME;
696 }
697 
698 static void ieee80211_scan_state_decision(struct ieee80211_local *local,
699                                           unsigned long *next_delay)
700 {
701         bool associated = false;
702         bool tx_empty = true;
703         bool bad_latency;
704         struct ieee80211_sub_if_data *sdata;
705         struct ieee80211_channel *next_chan;
706         enum mac80211_scan_state next_scan_state;
707         struct cfg80211_scan_request *scan_req;
708 
709         /*
710          * check if at least one STA interface is associated,
711          * check if at least one STA interface has pending tx frames
712          * and grab the lowest used beacon interval
713          */
714         mutex_lock(&local->iflist_mtx);
715         list_for_each_entry(sdata, &local->interfaces, list) {
716                 if (!ieee80211_sdata_running(sdata))
717                         continue;
718 
719                 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
720                         if (sdata->u.mgd.associated) {
721                                 associated = true;
722 
723                                 if (!qdisc_all_tx_empty(sdata->dev)) {
724                                         tx_empty = false;
725                                         break;
726                                 }
727                         }
728                 }
729         }
730         mutex_unlock(&local->iflist_mtx);
731 
732         scan_req = rcu_dereference_protected(local->scan_req,
733                                              lockdep_is_held(&local->mtx));
734 
735         next_chan = scan_req->channels[local->scan_channel_idx];
736 
737         /*
738          * we're currently scanning a different channel, let's
739          * see if we can scan another channel without interfering
740          * with the current traffic situation.
741          *
742          * Keep good latency, do not stay off-channel more than 125 ms.
743          */
744 
745         bad_latency = time_after(jiffies +
746                                  ieee80211_scan_get_channel_time(next_chan),
747                                  local->leave_oper_channel_time + HZ / 8);
748 
749         if (associated && !tx_empty) {
750                 if (scan_req->flags & NL80211_SCAN_FLAG_LOW_PRIORITY)
751                         next_scan_state = SCAN_ABORT;
752                 else
753                         next_scan_state = SCAN_SUSPEND;
754         } else if (associated && bad_latency) {
755                 next_scan_state = SCAN_SUSPEND;
756         } else {
757                 next_scan_state = SCAN_SET_CHANNEL;
758         }
759 
760         local->next_scan_state = next_scan_state;
761 
762         *next_delay = 0;
763 }
764 
765 static void ieee80211_scan_state_set_channel(struct ieee80211_local *local,
766                                              unsigned long *next_delay)
767 {
768         int skip;
769         struct ieee80211_channel *chan;
770         enum nl80211_bss_scan_width oper_scan_width;
771         struct cfg80211_scan_request *scan_req;
772 
773         scan_req = rcu_dereference_protected(local->scan_req,
774                                              lockdep_is_held(&local->mtx));
775 
776         skip = 0;
777         chan = scan_req->channels[local->scan_channel_idx];
778 
779         local->scan_chandef.chan = chan;
780         local->scan_chandef.center_freq1 = chan->center_freq;
781         local->scan_chandef.center_freq2 = 0;
782         switch (scan_req->scan_width) {
783         case NL80211_BSS_CHAN_WIDTH_5:
784                 local->scan_chandef.width = NL80211_CHAN_WIDTH_5;
785                 break;
786         case NL80211_BSS_CHAN_WIDTH_10:
787                 local->scan_chandef.width = NL80211_CHAN_WIDTH_10;
788                 break;
789         case NL80211_BSS_CHAN_WIDTH_20:
790                 /* If scanning on oper channel, use whatever channel-type
791                  * is currently in use.
792                  */
793                 oper_scan_width = cfg80211_chandef_to_scan_width(
794                                         &local->_oper_chandef);
795                 if (chan == local->_oper_chandef.chan &&
796                     oper_scan_width == scan_req->scan_width)
797                         local->scan_chandef = local->_oper_chandef;
798                 else
799                         local->scan_chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
800                 break;
801         }
802 
803         if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL))
804                 skip = 1;
805 
806         /* advance state machine to next channel/band */
807         local->scan_channel_idx++;
808 
809         if (skip) {
810                 /* if we skip this channel return to the decision state */
811                 local->next_scan_state = SCAN_DECISION;
812                 return;
813         }
814 
815         /*
816          * Probe delay is used to update the NAV, cf. 11.1.3.2.2
817          * (which unfortunately doesn't say _why_ step a) is done,
818          * but it waits for the probe delay or until a frame is
819          * received - and the received frame would update the NAV).
820          * For now, we do not support waiting until a frame is
821          * received.
822          *
823          * In any case, it is not necessary for a passive scan.
824          */
825         if ((chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR)) ||
826             !scan_req->n_ssids) {
827                 *next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
828                 local->next_scan_state = SCAN_DECISION;
829                 return;
830         }
831 
832         /* active scan, send probes */
833         *next_delay = IEEE80211_PROBE_DELAY;
834         local->next_scan_state = SCAN_SEND_PROBE;
835 }
836 
837 static void ieee80211_scan_state_suspend(struct ieee80211_local *local,
838                                          unsigned long *next_delay)
839 {
840         /* switch back to the operating channel */
841         local->scan_chandef.chan = NULL;
842         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
843 
844         /* disable PS */
845         ieee80211_offchannel_return(local);
846 
847         *next_delay = HZ / 5;
848         /* afterwards, resume scan & go to next channel */
849         local->next_scan_state = SCAN_RESUME;
850 }
851 
852 static void ieee80211_scan_state_resume(struct ieee80211_local *local,
853                                         unsigned long *next_delay)
854 {
855         ieee80211_offchannel_stop_vifs(local);
856 
857         if (local->ops->flush) {
858                 ieee80211_flush_queues(local, NULL, false);
859                 *next_delay = 0;
860         } else
861                 *next_delay = HZ / 10;
862 
863         /* remember when we left the operating channel */
864         local->leave_oper_channel_time = jiffies;
865 
866         /* advance to the next channel to be scanned */
867         local->next_scan_state = SCAN_SET_CHANNEL;
868 }
869 
870 void ieee80211_scan_work(struct work_struct *work)
871 {
872         struct ieee80211_local *local =
873                 container_of(work, struct ieee80211_local, scan_work.work);
874         struct ieee80211_sub_if_data *sdata;
875         struct cfg80211_scan_request *scan_req;
876         unsigned long next_delay = 0;
877         bool aborted;
878 
879         mutex_lock(&local->mtx);
880 
881         if (!ieee80211_can_run_worker(local)) {
882                 aborted = true;
883                 goto out_complete;
884         }
885 
886         sdata = rcu_dereference_protected(local->scan_sdata,
887                                           lockdep_is_held(&local->mtx));
888         scan_req = rcu_dereference_protected(local->scan_req,
889                                              lockdep_is_held(&local->mtx));
890 
891         /* When scanning on-channel, the first-callback means completed. */
892         if (test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning)) {
893                 aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning);
894                 goto out_complete;
895         }
896 
897         if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) {
898                 aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning);
899                 goto out_complete;
900         }
901 
902         if (!sdata || !scan_req)
903                 goto out;
904 
905         if (!local->scanning) {
906                 int rc;
907 
908                 RCU_INIT_POINTER(local->scan_req, NULL);
909                 RCU_INIT_POINTER(local->scan_sdata, NULL);
910 
911                 rc = __ieee80211_start_scan(sdata, scan_req);
912                 if (rc) {
913                         /* need to complete scan in cfg80211 */
914                         rcu_assign_pointer(local->scan_req, scan_req);
915                         aborted = true;
916                         goto out_complete;
917                 } else
918                         goto out;
919         }
920 
921         /*
922          * as long as no delay is required advance immediately
923          * without scheduling a new work
924          */
925         do {
926                 if (!ieee80211_sdata_running(sdata)) {
927                         aborted = true;
928                         goto out_complete;
929                 }
930 
931                 switch (local->next_scan_state) {
932                 case SCAN_DECISION:
933                         /* if no more bands/channels left, complete scan */
934                         if (local->scan_channel_idx >= scan_req->n_channels) {
935                                 aborted = false;
936                                 goto out_complete;
937                         }
938                         ieee80211_scan_state_decision(local, &next_delay);
939                         break;
940                 case SCAN_SET_CHANNEL:
941                         ieee80211_scan_state_set_channel(local, &next_delay);
942                         break;
943                 case SCAN_SEND_PROBE:
944                         ieee80211_scan_state_send_probe(local, &next_delay);
945                         break;
946                 case SCAN_SUSPEND:
947                         ieee80211_scan_state_suspend(local, &next_delay);
948                         break;
949                 case SCAN_RESUME:
950                         ieee80211_scan_state_resume(local, &next_delay);
951                         break;
952                 case SCAN_ABORT:
953                         aborted = true;
954                         goto out_complete;
955                 }
956         } while (next_delay == 0);
957 
958         ieee80211_queue_delayed_work(&local->hw, &local->scan_work, next_delay);
959         goto out;
960 
961 out_complete:
962         __ieee80211_scan_completed(&local->hw, aborted);
963 out:
964         mutex_unlock(&local->mtx);
965 }
966 
967 int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata,
968                            struct cfg80211_scan_request *req)
969 {
970         int res;
971 
972         mutex_lock(&sdata->local->mtx);
973         res = __ieee80211_start_scan(sdata, req);
974         mutex_unlock(&sdata->local->mtx);
975 
976         return res;
977 }
978 
979 int ieee80211_request_ibss_scan(struct ieee80211_sub_if_data *sdata,
980                                 const u8 *ssid, u8 ssid_len,
981                                 struct ieee80211_channel **channels,
982                                 unsigned int n_channels,
983                                 enum nl80211_bss_scan_width scan_width)
984 {
985         struct ieee80211_local *local = sdata->local;
986         int ret = -EBUSY, i, n_ch = 0;
987         enum nl80211_band band;
988 
989         mutex_lock(&local->mtx);
990 
991         /* busy scanning */
992         if (local->scan_req)
993                 goto unlock;
994 
995         /* fill internal scan request */
996         if (!channels) {
997                 int max_n;
998 
999                 for (band = 0; band < NUM_NL80211_BANDS; band++) {
1000                         if (!local->hw.wiphy->bands[band])
1001                                 continue;
1002 
1003                         max_n = local->hw.wiphy->bands[band]->n_channels;
1004                         for (i = 0; i < max_n; i++) {
1005                                 struct ieee80211_channel *tmp_ch =
1006                                     &local->hw.wiphy->bands[band]->channels[i];
1007 
1008                                 if (tmp_ch->flags & (IEEE80211_CHAN_NO_IR |
1009                                                      IEEE80211_CHAN_DISABLED))
1010                                         continue;
1011 
1012                                 local->int_scan_req->channels[n_ch] = tmp_ch;
1013                                 n_ch++;
1014                         }
1015                 }
1016 
1017                 if (WARN_ON_ONCE(n_ch == 0))
1018                         goto unlock;
1019 
1020                 local->int_scan_req->n_channels = n_ch;
1021         } else {
1022                 for (i = 0; i < n_channels; i++) {
1023                         if (channels[i]->flags & (IEEE80211_CHAN_NO_IR |
1024                                                   IEEE80211_CHAN_DISABLED))
1025                                 continue;
1026 
1027                         local->int_scan_req->channels[n_ch] = channels[i];
1028                         n_ch++;
1029                 }
1030 
1031                 if (WARN_ON_ONCE(n_ch == 0))
1032                         goto unlock;
1033 
1034                 local->int_scan_req->n_channels = n_ch;
1035         }
1036 
1037         local->int_scan_req->ssids = &local->scan_ssid;
1038         local->int_scan_req->n_ssids = 1;
1039         local->int_scan_req->scan_width = scan_width;
1040         memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN);
1041         local->int_scan_req->ssids[0].ssid_len = ssid_len;
1042 
1043         ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req);
1044  unlock:
1045         mutex_unlock(&local->mtx);
1046         return ret;
1047 }
1048 
1049 /*
1050  * Only call this function when a scan can't be queued -- under RTNL.
1051  */
1052 void ieee80211_scan_cancel(struct ieee80211_local *local)
1053 {
1054         /*
1055          * We are canceling software scan, or deferred scan that was not
1056          * yet really started (see __ieee80211_start_scan ).
1057          *
1058          * Regarding hardware scan:
1059          * - we can not call  __ieee80211_scan_completed() as when
1060          *   SCAN_HW_SCANNING bit is set this function change
1061          *   local->hw_scan_req to operate on 5G band, what race with
1062          *   driver which can use local->hw_scan_req
1063          *
1064          * - we can not cancel scan_work since driver can schedule it
1065          *   by ieee80211_scan_completed(..., true) to finish scan
1066          *
1067          * Hence we only call the cancel_hw_scan() callback, but the low-level
1068          * driver is still responsible for calling ieee80211_scan_completed()
1069          * after the scan was completed/aborted.
1070          */
1071 
1072         mutex_lock(&local->mtx);
1073         if (!local->scan_req)
1074                 goto out;
1075 
1076         /*
1077          * We have a scan running and the driver already reported completion,
1078          * but the worker hasn't run yet or is stuck on the mutex - mark it as
1079          * cancelled.
1080          */
1081         if (test_bit(SCAN_HW_SCANNING, &local->scanning) &&
1082             test_bit(SCAN_COMPLETED, &local->scanning)) {
1083                 set_bit(SCAN_HW_CANCELLED, &local->scanning);
1084                 goto out;
1085         }
1086 
1087         if (test_bit(SCAN_HW_SCANNING, &local->scanning)) {
1088                 /*
1089                  * Make sure that __ieee80211_scan_completed doesn't trigger a
1090                  * scan on another band.
1091                  */
1092                 set_bit(SCAN_HW_CANCELLED, &local->scanning);
1093                 if (local->ops->cancel_hw_scan)
1094                         drv_cancel_hw_scan(local,
1095                                 rcu_dereference_protected(local->scan_sdata,
1096                                                 lockdep_is_held(&local->mtx)));
1097                 goto out;
1098         }
1099 
1100         /*
1101          * If the work is currently running, it must be blocked on
1102          * the mutex, but we'll set scan_sdata = NULL and it'll
1103          * simply exit once it acquires the mutex.
1104          */
1105         cancel_delayed_work(&local->scan_work);
1106         /* and clean up */
1107         memset(&local->scan_info, 0, sizeof(local->scan_info));
1108         __ieee80211_scan_completed(&local->hw, true);
1109 out:
1110         mutex_unlock(&local->mtx);
1111 }
1112 
1113 int __ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata,
1114                                         struct cfg80211_sched_scan_request *req)
1115 {
1116         struct ieee80211_local *local = sdata->local;
1117         struct ieee80211_scan_ies sched_scan_ies = {};
1118         struct cfg80211_chan_def chandef;
1119         int ret, i, iebufsz, num_bands = 0;
1120         u32 rate_masks[NUM_NL80211_BANDS] = {};
1121         u8 bands_used = 0;
1122         u8 *ie;
1123         size_t len;
1124 
1125         iebufsz = local->scan_ies_len + req->ie_len;
1126 
1127         lockdep_assert_held(&local->mtx);
1128 
1129         if (!local->ops->sched_scan_start)
1130                 return -ENOTSUPP;
1131 
1132         for (i = 0; i < NUM_NL80211_BANDS; i++) {
1133                 if (local->hw.wiphy->bands[i]) {
1134                         bands_used |= BIT(i);
1135                         rate_masks[i] = (u32) -1;
1136                         num_bands++;
1137                 }
1138         }
1139 
1140         ie = kzalloc(num_bands * iebufsz, GFP_KERNEL);
1141         if (!ie) {
1142                 ret = -ENOMEM;
1143                 goto out;
1144         }
1145 
1146         ieee80211_prepare_scan_chandef(&chandef, req->scan_width);
1147 
1148         len = ieee80211_build_preq_ies(local, ie, num_bands * iebufsz,
1149                                        &sched_scan_ies, req->ie,
1150                                        req->ie_len, bands_used,
1151                                        rate_masks, &chandef);
1152 
1153         ret = drv_sched_scan_start(local, sdata, req, &sched_scan_ies);
1154         if (ret == 0) {
1155                 rcu_assign_pointer(local->sched_scan_sdata, sdata);
1156                 rcu_assign_pointer(local->sched_scan_req, req);
1157         }
1158 
1159         kfree(ie);
1160 
1161 out:
1162         if (ret) {
1163                 /* Clean in case of failure after HW restart or upon resume. */
1164                 RCU_INIT_POINTER(local->sched_scan_sdata, NULL);
1165                 RCU_INIT_POINTER(local->sched_scan_req, NULL);
1166         }
1167 
1168         return ret;
1169 }
1170 
1171 int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata,
1172                                        struct cfg80211_sched_scan_request *req)
1173 {
1174         struct ieee80211_local *local = sdata->local;
1175         int ret;
1176 
1177         mutex_lock(&local->mtx);
1178 
1179         if (rcu_access_pointer(local->sched_scan_sdata)) {
1180                 mutex_unlock(&local->mtx);
1181                 return -EBUSY;
1182         }
1183 
1184         ret = __ieee80211_request_sched_scan_start(sdata, req);
1185 
1186         mutex_unlock(&local->mtx);
1187         return ret;
1188 }
1189 
1190 int ieee80211_request_sched_scan_stop(struct ieee80211_local *local)
1191 {
1192         struct ieee80211_sub_if_data *sched_scan_sdata;
1193         int ret = -ENOENT;
1194 
1195         mutex_lock(&local->mtx);
1196 
1197         if (!local->ops->sched_scan_stop) {
1198                 ret = -ENOTSUPP;
1199                 goto out;
1200         }
1201 
1202         /* We don't want to restart sched scan anymore. */
1203         RCU_INIT_POINTER(local->sched_scan_req, NULL);
1204 
1205         sched_scan_sdata = rcu_dereference_protected(local->sched_scan_sdata,
1206                                                 lockdep_is_held(&local->mtx));
1207         if (sched_scan_sdata) {
1208                 ret = drv_sched_scan_stop(local, sched_scan_sdata);
1209                 if (!ret)
1210                         RCU_INIT_POINTER(local->sched_scan_sdata, NULL);
1211         }
1212 out:
1213         mutex_unlock(&local->mtx);
1214 
1215         return ret;
1216 }
1217 
1218 void ieee80211_sched_scan_results(struct ieee80211_hw *hw)
1219 {
1220         struct ieee80211_local *local = hw_to_local(hw);
1221 
1222         trace_api_sched_scan_results(local);
1223 
1224         cfg80211_sched_scan_results(hw->wiphy);
1225 }
1226 EXPORT_SYMBOL(ieee80211_sched_scan_results);
1227 
1228 void ieee80211_sched_scan_end(struct ieee80211_local *local)
1229 {
1230         mutex_lock(&local->mtx);
1231 
1232         if (!rcu_access_pointer(local->sched_scan_sdata)) {
1233                 mutex_unlock(&local->mtx);
1234                 return;
1235         }
1236 
1237         RCU_INIT_POINTER(local->sched_scan_sdata, NULL);
1238 
1239         /* If sched scan was aborted by the driver. */
1240         RCU_INIT_POINTER(local->sched_scan_req, NULL);
1241 
1242         mutex_unlock(&local->mtx);
1243 
1244         cfg80211_sched_scan_stopped(local->hw.wiphy);
1245 }
1246 
1247 void ieee80211_sched_scan_stopped_work(struct work_struct *work)
1248 {
1249         struct ieee80211_local *local =
1250                 container_of(work, struct ieee80211_local,
1251                              sched_scan_stopped_work);
1252 
1253         ieee80211_sched_scan_end(local);
1254 }
1255 
1256 void ieee80211_sched_scan_stopped(struct ieee80211_hw *hw)
1257 {
1258         struct ieee80211_local *local = hw_to_local(hw);
1259 
1260         trace_api_sched_scan_stopped(local);
1261 
1262         /*
1263          * this shouldn't really happen, so for simplicity
1264          * simply ignore it, and let mac80211 reconfigure
1265          * the sched scan later on.
1266          */
1267         if (local->in_reconfig)
1268                 return;
1269 
1270         schedule_work(&local->sched_scan_stopped_work);
1271 }
1272 EXPORT_SYMBOL(ieee80211_sched_scan_stopped);
1273 

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