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15#include <linux/if_arp.h>
16#include <linux/etherdevice.h>
17#include <linux/rtnetlink.h>
18#include <linux/pm_qos.h>
19#include <net/sch_generic.h>
20#include <linux/slab.h>
21#include <linux/export.h>
22#include <net/mac80211.h>
23
24#include "ieee80211_i.h"
25#include "driver-ops.h"
26#include "mesh.h"
27
28#define IEEE80211_PROBE_DELAY (HZ / 33)
29#define IEEE80211_CHANNEL_TIME (HZ / 33)
30#define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 9)
31
32void ieee80211_rx_bss_put(struct ieee80211_local *local,
33 struct ieee80211_bss *bss)
34{
35 if (!bss)
36 return;
37 cfg80211_put_bss(local->hw.wiphy,
38 container_of((void *)bss, struct cfg80211_bss, priv));
39}
40
41static bool is_uapsd_supported(struct ieee802_11_elems *elems)
42{
43 u8 qos_info;
44
45 if (elems->wmm_info && elems->wmm_info_len == 7
46 && elems->wmm_info[5] == 1)
47 qos_info = elems->wmm_info[6];
48 else if (elems->wmm_param && elems->wmm_param_len == 24
49 && elems->wmm_param[5] == 1)
50 qos_info = elems->wmm_param[6];
51 else
52
53 return false;
54
55 return qos_info & IEEE80211_WMM_IE_AP_QOSINFO_UAPSD;
56}
57
58struct ieee80211_bss *
59ieee80211_bss_info_update(struct ieee80211_local *local,
60 struct ieee80211_rx_status *rx_status,
61 struct ieee80211_mgmt *mgmt, size_t len,
62 struct ieee802_11_elems *elems,
63 struct ieee80211_channel *channel)
64{
65 bool beacon = ieee80211_is_beacon(mgmt->frame_control);
66 struct cfg80211_bss *cbss;
67 struct ieee80211_bss *bss;
68 int clen, srlen;
69 s32 signal = 0;
70
71 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
72 signal = rx_status->signal * 100;
73 else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
74 signal = (rx_status->signal * 100) / local->hw.max_signal;
75
76 cbss = cfg80211_inform_bss_frame(local->hw.wiphy, channel,
77 mgmt, len, signal, GFP_ATOMIC);
78 if (!cbss)
79 return NULL;
80
81 bss = (void *)cbss->priv;
82
83 if (beacon)
84 bss->device_ts_beacon = rx_status->device_timestamp;
85 else
86 bss->device_ts_presp = rx_status->device_timestamp;
87
88 if (elems->parse_error) {
89 if (beacon)
90 bss->corrupt_data |= IEEE80211_BSS_CORRUPT_BEACON;
91 else
92 bss->corrupt_data |= IEEE80211_BSS_CORRUPT_PROBE_RESP;
93 } else {
94 if (beacon)
95 bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_BEACON;
96 else
97 bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_PROBE_RESP;
98 }
99
100
101 if (elems->erp_info && (!elems->parse_error ||
102 !(bss->valid_data & IEEE80211_BSS_VALID_ERP))) {
103 bss->erp_value = elems->erp_info[0];
104 bss->has_erp_value = true;
105 if (!elems->parse_error)
106 bss->valid_data |= IEEE80211_BSS_VALID_ERP;
107 }
108
109
110 if (!elems->parse_error ||
111 !(bss->valid_data & IEEE80211_BSS_VALID_RATES)) {
112 srlen = 0;
113 if (elems->supp_rates) {
114 clen = IEEE80211_MAX_SUPP_RATES;
115 if (clen > elems->supp_rates_len)
116 clen = elems->supp_rates_len;
117 memcpy(bss->supp_rates, elems->supp_rates, clen);
118 srlen += clen;
119 }
120 if (elems->ext_supp_rates) {
121 clen = IEEE80211_MAX_SUPP_RATES - srlen;
122 if (clen > elems->ext_supp_rates_len)
123 clen = elems->ext_supp_rates_len;
124 memcpy(bss->supp_rates + srlen, elems->ext_supp_rates,
125 clen);
126 srlen += clen;
127 }
128 if (srlen) {
129 bss->supp_rates_len = srlen;
130 if (!elems->parse_error)
131 bss->valid_data |= IEEE80211_BSS_VALID_RATES;
132 }
133 }
134
135 if (!elems->parse_error ||
136 !(bss->valid_data & IEEE80211_BSS_VALID_WMM)) {
137 bss->wmm_used = elems->wmm_param || elems->wmm_info;
138 bss->uapsd_supported = is_uapsd_supported(elems);
139 if (!elems->parse_error)
140 bss->valid_data |= IEEE80211_BSS_VALID_WMM;
141 }
142
143 return bss;
144}
145
146void ieee80211_scan_rx(struct ieee80211_local *local, struct sk_buff *skb)
147{
148 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
149 struct ieee80211_sub_if_data *sdata1, *sdata2;
150 struct ieee80211_mgmt *mgmt = (void *)skb->data;
151 struct ieee80211_bss *bss;
152 u8 *elements;
153 struct ieee80211_channel *channel;
154 size_t baselen;
155 struct ieee802_11_elems elems;
156
157 if (skb->len < 24 ||
158 (!ieee80211_is_probe_resp(mgmt->frame_control) &&
159 !ieee80211_is_beacon(mgmt->frame_control)))
160 return;
161
162 sdata1 = rcu_dereference(local->scan_sdata);
163 sdata2 = rcu_dereference(local->sched_scan_sdata);
164
165 if (likely(!sdata1 && !sdata2))
166 return;
167
168 if (ieee80211_is_probe_resp(mgmt->frame_control)) {
169
170 if ((!sdata1 || !ether_addr_equal(mgmt->da, sdata1->vif.addr)) &&
171 (!sdata2 || !ether_addr_equal(mgmt->da, sdata2->vif.addr)))
172 return;
173
174 elements = mgmt->u.probe_resp.variable;
175 baselen = offsetof(struct ieee80211_mgmt, u.probe_resp.variable);
176 } else {
177 baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable);
178 elements = mgmt->u.beacon.variable;
179 }
180
181 if (baselen > skb->len)
182 return;
183
184 ieee802_11_parse_elems(elements, skb->len - baselen, false, &elems);
185
186 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
187
188 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
189 return;
190
191 bss = ieee80211_bss_info_update(local, rx_status,
192 mgmt, skb->len, &elems,
193 channel);
194 if (bss)
195 ieee80211_rx_bss_put(local, bss);
196}
197
198
199static bool ieee80211_prep_hw_scan(struct ieee80211_local *local)
200{
201 struct cfg80211_scan_request *req = local->scan_req;
202 enum ieee80211_band band;
203 int i, ielen, n_chans;
204
205 do {
206 if (local->hw_scan_band == IEEE80211_NUM_BANDS)
207 return false;
208
209 band = local->hw_scan_band;
210 n_chans = 0;
211 for (i = 0; i < req->n_channels; i++) {
212 if (req->channels[i]->band == band) {
213 local->hw_scan_req->channels[n_chans] =
214 req->channels[i];
215 n_chans++;
216 }
217 }
218
219 local->hw_scan_band++;
220 } while (!n_chans);
221
222 local->hw_scan_req->n_channels = n_chans;
223
224 ielen = ieee80211_build_preq_ies(local, (u8 *)local->hw_scan_req->ie,
225 local->hw_scan_ies_bufsize,
226 req->ie, req->ie_len, band,
227 req->rates[band], 0);
228 local->hw_scan_req->ie_len = ielen;
229 local->hw_scan_req->no_cck = req->no_cck;
230
231 return true;
232}
233
234static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted,
235 bool was_hw_scan)
236{
237 struct ieee80211_local *local = hw_to_local(hw);
238
239 lockdep_assert_held(&local->mtx);
240
241
242
243
244
245
246
247 if (WARN_ON(!local->scanning && !aborted))
248 aborted = true;
249
250 if (WARN_ON(!local->scan_req))
251 return;
252
253 if (was_hw_scan && !aborted && ieee80211_prep_hw_scan(local)) {
254 int rc;
255
256 rc = drv_hw_scan(local,
257 rcu_dereference_protected(local->scan_sdata,
258 lockdep_is_held(&local->mtx)),
259 local->hw_scan_req);
260
261 if (rc == 0)
262 return;
263 }
264
265 kfree(local->hw_scan_req);
266 local->hw_scan_req = NULL;
267
268 if (local->scan_req != local->int_scan_req)
269 cfg80211_scan_done(local->scan_req, aborted);
270 local->scan_req = NULL;
271 rcu_assign_pointer(local->scan_sdata, NULL);
272
273 local->scanning = 0;
274 local->scan_channel = NULL;
275
276
277 ieee80211_hw_config(local, 0);
278
279 if (!was_hw_scan) {
280 ieee80211_configure_filter(local);
281 drv_sw_scan_complete(local);
282 ieee80211_offchannel_return(local);
283 }
284
285 ieee80211_recalc_idle(local);
286
287 ieee80211_mlme_notify_scan_completed(local);
288 ieee80211_ibss_notify_scan_completed(local);
289 ieee80211_mesh_notify_scan_completed(local);
290 ieee80211_start_next_roc(local);
291}
292
293void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted)
294{
295 struct ieee80211_local *local = hw_to_local(hw);
296
297 trace_api_scan_completed(local, aborted);
298
299 set_bit(SCAN_COMPLETED, &local->scanning);
300 if (aborted)
301 set_bit(SCAN_ABORTED, &local->scanning);
302 ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0);
303}
304EXPORT_SYMBOL(ieee80211_scan_completed);
305
306static int ieee80211_start_sw_scan(struct ieee80211_local *local)
307{
308
309 if (local->use_chanctx)
310 return -EOPNOTSUPP;
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325 drv_sw_scan_start(local);
326
327 local->leave_oper_channel_time = jiffies;
328 local->next_scan_state = SCAN_DECISION;
329 local->scan_channel_idx = 0;
330
331 ieee80211_offchannel_stop_vifs(local);
332
333
334 ieee80211_flush_queues(local, NULL);
335
336 ieee80211_configure_filter(local);
337
338
339 ieee80211_hw_config(local, 0);
340
341 ieee80211_queue_delayed_work(&local->hw,
342 &local->scan_work, 0);
343
344 return 0;
345}
346
347static bool ieee80211_can_scan(struct ieee80211_local *local,
348 struct ieee80211_sub_if_data *sdata)
349{
350 if (local->radar_detect_enabled)
351 return false;
352
353 if (!list_empty(&local->roc_list))
354 return false;
355
356 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
357 sdata->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
358 IEEE80211_STA_CONNECTION_POLL))
359 return false;
360
361 return true;
362}
363
364void ieee80211_run_deferred_scan(struct ieee80211_local *local)
365{
366 lockdep_assert_held(&local->mtx);
367
368 if (!local->scan_req || local->scanning)
369 return;
370
371 if (!ieee80211_can_scan(local,
372 rcu_dereference_protected(
373 local->scan_sdata,
374 lockdep_is_held(&local->mtx))))
375 return;
376
377 ieee80211_queue_delayed_work(&local->hw, &local->scan_work,
378 round_jiffies_relative(0));
379}
380
381static void ieee80211_scan_state_send_probe(struct ieee80211_local *local,
382 unsigned long *next_delay)
383{
384 int i;
385 struct ieee80211_sub_if_data *sdata;
386 enum ieee80211_band band = local->hw.conf.chandef.chan->band;
387 u32 tx_flags;
388
389 tx_flags = IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
390 if (local->scan_req->no_cck)
391 tx_flags |= IEEE80211_TX_CTL_NO_CCK_RATE;
392
393 sdata = rcu_dereference_protected(local->scan_sdata,
394 lockdep_is_held(&local->mtx));
395
396 for (i = 0; i < local->scan_req->n_ssids; i++)
397 ieee80211_send_probe_req(
398 sdata, NULL,
399 local->scan_req->ssids[i].ssid,
400 local->scan_req->ssids[i].ssid_len,
401 local->scan_req->ie, local->scan_req->ie_len,
402 local->scan_req->rates[band], false,
403 tx_flags, local->hw.conf.chandef.chan, true);
404
405
406
407
408
409 *next_delay = IEEE80211_CHANNEL_TIME;
410 local->next_scan_state = SCAN_DECISION;
411}
412
413static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata,
414 struct cfg80211_scan_request *req)
415{
416 struct ieee80211_local *local = sdata->local;
417 int rc;
418
419 lockdep_assert_held(&local->mtx);
420
421 if (local->scan_req)
422 return -EBUSY;
423
424 if (!ieee80211_can_scan(local, sdata)) {
425
426 local->scan_req = req;
427 rcu_assign_pointer(local->scan_sdata, sdata);
428 return 0;
429 }
430
431 if (local->ops->hw_scan) {
432 u8 *ies;
433
434 local->hw_scan_ies_bufsize = 2 + IEEE80211_MAX_SSID_LEN +
435 local->scan_ies_len +
436 req->ie_len;
437 local->hw_scan_req = kmalloc(
438 sizeof(*local->hw_scan_req) +
439 req->n_channels * sizeof(req->channels[0]) +
440 local->hw_scan_ies_bufsize, GFP_KERNEL);
441 if (!local->hw_scan_req)
442 return -ENOMEM;
443
444 local->hw_scan_req->ssids = req->ssids;
445 local->hw_scan_req->n_ssids = req->n_ssids;
446 ies = (u8 *)local->hw_scan_req +
447 sizeof(*local->hw_scan_req) +
448 req->n_channels * sizeof(req->channels[0]);
449 local->hw_scan_req->ie = ies;
450 local->hw_scan_req->flags = req->flags;
451
452 local->hw_scan_band = 0;
453
454
455
456
457
458
459
460
461 }
462
463 local->scan_req = req;
464 rcu_assign_pointer(local->scan_sdata, sdata);
465
466 if (local->ops->hw_scan) {
467 __set_bit(SCAN_HW_SCANNING, &local->scanning);
468 } else if ((req->n_channels == 1) &&
469 (req->channels[0] == local->_oper_chandef.chan)) {
470
471
472
473
474 unsigned long next_delay;
475
476 __set_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
477
478 ieee80211_recalc_idle(local);
479
480
481
482 drv_sw_scan_start(local);
483
484 ieee80211_configure_filter(local);
485
486
487 ieee80211_hw_config(local, 0);
488
489 if ((req->channels[0]->flags &
490 IEEE80211_CHAN_PASSIVE_SCAN) ||
491 !local->scan_req->n_ssids) {
492 next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
493 } else {
494 ieee80211_scan_state_send_probe(local, &next_delay);
495 next_delay = IEEE80211_CHANNEL_TIME;
496 }
497
498
499 ieee80211_queue_delayed_work(&local->hw, &local->scan_work,
500 next_delay);
501 return 0;
502 } else {
503
504 __set_bit(SCAN_SW_SCANNING, &local->scanning);
505 }
506
507 ieee80211_recalc_idle(local);
508
509 if (local->ops->hw_scan) {
510 WARN_ON(!ieee80211_prep_hw_scan(local));
511 rc = drv_hw_scan(local, sdata, local->hw_scan_req);
512 } else
513 rc = ieee80211_start_sw_scan(local);
514
515 if (rc) {
516 kfree(local->hw_scan_req);
517 local->hw_scan_req = NULL;
518 local->scanning = 0;
519
520 ieee80211_recalc_idle(local);
521
522 local->scan_req = NULL;
523 rcu_assign_pointer(local->scan_sdata, NULL);
524 }
525
526 return rc;
527}
528
529static unsigned long
530ieee80211_scan_get_channel_time(struct ieee80211_channel *chan)
531{
532
533
534
535
536 if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN)
537 return IEEE80211_PASSIVE_CHANNEL_TIME;
538 return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME;
539}
540
541static void ieee80211_scan_state_decision(struct ieee80211_local *local,
542 unsigned long *next_delay)
543{
544 bool associated = false;
545 bool tx_empty = true;
546 bool bad_latency;
547 struct ieee80211_sub_if_data *sdata;
548 struct ieee80211_channel *next_chan;
549 enum mac80211_scan_state next_scan_state;
550
551
552
553
554
555
556 mutex_lock(&local->iflist_mtx);
557 list_for_each_entry(sdata, &local->interfaces, list) {
558 if (!ieee80211_sdata_running(sdata))
559 continue;
560
561 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
562 if (sdata->u.mgd.associated) {
563 associated = true;
564
565 if (!qdisc_all_tx_empty(sdata->dev)) {
566 tx_empty = false;
567 break;
568 }
569 }
570 }
571 }
572 mutex_unlock(&local->iflist_mtx);
573
574 next_chan = local->scan_req->channels[local->scan_channel_idx];
575
576
577
578
579
580
581
582
583
584 bad_latency = time_after(jiffies +
585 ieee80211_scan_get_channel_time(next_chan),
586 local->leave_oper_channel_time + HZ / 8);
587
588 if (associated && !tx_empty) {
589 if (local->scan_req->flags & NL80211_SCAN_FLAG_LOW_PRIORITY)
590 next_scan_state = SCAN_ABORT;
591 else
592 next_scan_state = SCAN_SUSPEND;
593 } else if (associated && bad_latency) {
594 next_scan_state = SCAN_SUSPEND;
595 } else {
596 next_scan_state = SCAN_SET_CHANNEL;
597 }
598
599 local->next_scan_state = next_scan_state;
600
601 *next_delay = 0;
602}
603
604static void ieee80211_scan_state_set_channel(struct ieee80211_local *local,
605 unsigned long *next_delay)
606{
607 int skip;
608 struct ieee80211_channel *chan;
609
610 skip = 0;
611 chan = local->scan_req->channels[local->scan_channel_idx];
612
613 local->scan_channel = chan;
614
615 if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL))
616 skip = 1;
617
618
619 local->scan_channel_idx++;
620
621 if (skip) {
622
623 local->next_scan_state = SCAN_DECISION;
624 return;
625 }
626
627
628
629
630
631
632
633
634
635
636
637 if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN ||
638 !local->scan_req->n_ssids) {
639 *next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
640 local->next_scan_state = SCAN_DECISION;
641 return;
642 }
643
644
645 *next_delay = IEEE80211_PROBE_DELAY;
646 local->next_scan_state = SCAN_SEND_PROBE;
647}
648
649static void ieee80211_scan_state_suspend(struct ieee80211_local *local,
650 unsigned long *next_delay)
651{
652
653 local->scan_channel = NULL;
654 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
655
656
657 ieee80211_offchannel_return(local);
658
659 *next_delay = HZ / 5;
660
661 local->next_scan_state = SCAN_RESUME;
662}
663
664static void ieee80211_scan_state_resume(struct ieee80211_local *local,
665 unsigned long *next_delay)
666{
667 ieee80211_offchannel_stop_vifs(local);
668
669 if (local->ops->flush) {
670 ieee80211_flush_queues(local, NULL);
671 *next_delay = 0;
672 } else
673 *next_delay = HZ / 10;
674
675
676 local->leave_oper_channel_time = jiffies;
677
678
679 local->next_scan_state = SCAN_SET_CHANNEL;
680}
681
682void ieee80211_scan_work(struct work_struct *work)
683{
684 struct ieee80211_local *local =
685 container_of(work, struct ieee80211_local, scan_work.work);
686 struct ieee80211_sub_if_data *sdata;
687 unsigned long next_delay = 0;
688 bool aborted, hw_scan;
689
690 mutex_lock(&local->mtx);
691
692 sdata = rcu_dereference_protected(local->scan_sdata,
693 lockdep_is_held(&local->mtx));
694
695
696 if (test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning)) {
697 aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning);
698 goto out_complete;
699 }
700
701 if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) {
702 aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning);
703 goto out_complete;
704 }
705
706 if (!sdata || !local->scan_req)
707 goto out;
708
709 if (local->scan_req && !local->scanning) {
710 struct cfg80211_scan_request *req = local->scan_req;
711 int rc;
712
713 local->scan_req = NULL;
714 rcu_assign_pointer(local->scan_sdata, NULL);
715
716 rc = __ieee80211_start_scan(sdata, req);
717 if (rc) {
718
719 local->scan_req = req;
720 aborted = true;
721 goto out_complete;
722 } else
723 goto out;
724 }
725
726
727
728
729 if (!ieee80211_sdata_running(sdata)) {
730 aborted = true;
731 goto out_complete;
732 }
733
734
735
736
737
738 do {
739 if (!ieee80211_sdata_running(sdata)) {
740 aborted = true;
741 goto out_complete;
742 }
743
744 switch (local->next_scan_state) {
745 case SCAN_DECISION:
746
747 if (local->scan_channel_idx >= local->scan_req->n_channels) {
748 aborted = false;
749 goto out_complete;
750 }
751 ieee80211_scan_state_decision(local, &next_delay);
752 break;
753 case SCAN_SET_CHANNEL:
754 ieee80211_scan_state_set_channel(local, &next_delay);
755 break;
756 case SCAN_SEND_PROBE:
757 ieee80211_scan_state_send_probe(local, &next_delay);
758 break;
759 case SCAN_SUSPEND:
760 ieee80211_scan_state_suspend(local, &next_delay);
761 break;
762 case SCAN_RESUME:
763 ieee80211_scan_state_resume(local, &next_delay);
764 break;
765 case SCAN_ABORT:
766 aborted = true;
767 goto out_complete;
768 }
769 } while (next_delay == 0);
770
771 ieee80211_queue_delayed_work(&local->hw, &local->scan_work, next_delay);
772 goto out;
773
774out_complete:
775 hw_scan = test_bit(SCAN_HW_SCANNING, &local->scanning);
776 __ieee80211_scan_completed(&local->hw, aborted, hw_scan);
777out:
778 mutex_unlock(&local->mtx);
779}
780
781int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata,
782 struct cfg80211_scan_request *req)
783{
784 int res;
785
786 mutex_lock(&sdata->local->mtx);
787 res = __ieee80211_start_scan(sdata, req);
788 mutex_unlock(&sdata->local->mtx);
789
790 return res;
791}
792
793int ieee80211_request_ibss_scan(struct ieee80211_sub_if_data *sdata,
794 const u8 *ssid, u8 ssid_len,
795 struct ieee80211_channel *chan)
796{
797 struct ieee80211_local *local = sdata->local;
798 int ret = -EBUSY;
799 enum ieee80211_band band;
800
801 mutex_lock(&local->mtx);
802
803
804 if (local->scan_req)
805 goto unlock;
806
807
808 if (!chan) {
809 int i, max_n;
810 int n_ch = 0;
811
812 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
813 if (!local->hw.wiphy->bands[band])
814 continue;
815
816 max_n = local->hw.wiphy->bands[band]->n_channels;
817 for (i = 0; i < max_n; i++) {
818 struct ieee80211_channel *tmp_ch =
819 &local->hw.wiphy->bands[band]->channels[i];
820
821 if (tmp_ch->flags & (IEEE80211_CHAN_NO_IBSS |
822 IEEE80211_CHAN_DISABLED))
823 continue;
824
825 local->int_scan_req->channels[n_ch] = tmp_ch;
826 n_ch++;
827 }
828 }
829
830 if (WARN_ON_ONCE(n_ch == 0))
831 goto unlock;
832
833 local->int_scan_req->n_channels = n_ch;
834 } else {
835 if (WARN_ON_ONCE(chan->flags & (IEEE80211_CHAN_NO_IBSS |
836 IEEE80211_CHAN_DISABLED)))
837 goto unlock;
838
839 local->int_scan_req->channels[0] = chan;
840 local->int_scan_req->n_channels = 1;
841 }
842
843 local->int_scan_req->ssids = &local->scan_ssid;
844 local->int_scan_req->n_ssids = 1;
845 memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN);
846 local->int_scan_req->ssids[0].ssid_len = ssid_len;
847
848 ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req);
849 unlock:
850 mutex_unlock(&local->mtx);
851 return ret;
852}
853
854
855
856
857void ieee80211_scan_cancel(struct ieee80211_local *local)
858{
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877 mutex_lock(&local->mtx);
878 if (!local->scan_req)
879 goto out;
880
881 if (test_bit(SCAN_HW_SCANNING, &local->scanning)) {
882 if (local->ops->cancel_hw_scan)
883 drv_cancel_hw_scan(local,
884 rcu_dereference_protected(local->scan_sdata,
885 lockdep_is_held(&local->mtx)));
886 goto out;
887 }
888
889
890
891
892
893
894 cancel_delayed_work(&local->scan_work);
895
896 __ieee80211_scan_completed(&local->hw, true, false);
897out:
898 mutex_unlock(&local->mtx);
899}
900
901int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata,
902 struct cfg80211_sched_scan_request *req)
903{
904 struct ieee80211_local *local = sdata->local;
905 struct ieee80211_sched_scan_ies sched_scan_ies = {};
906 int ret, i, iebufsz;
907
908 iebufsz = 2 + IEEE80211_MAX_SSID_LEN +
909 local->scan_ies_len + req->ie_len;
910
911 mutex_lock(&local->mtx);
912
913 if (rcu_access_pointer(local->sched_scan_sdata)) {
914 ret = -EBUSY;
915 goto out;
916 }
917
918 if (!local->ops->sched_scan_start) {
919 ret = -ENOTSUPP;
920 goto out;
921 }
922
923 for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
924 if (!local->hw.wiphy->bands[i])
925 continue;
926
927 sched_scan_ies.ie[i] = kzalloc(iebufsz, GFP_KERNEL);
928 if (!sched_scan_ies.ie[i]) {
929 ret = -ENOMEM;
930 goto out_free;
931 }
932
933 sched_scan_ies.len[i] =
934 ieee80211_build_preq_ies(local, sched_scan_ies.ie[i],
935 iebufsz, req->ie, req->ie_len,
936 i, (u32) -1, 0);
937 }
938
939 ret = drv_sched_scan_start(local, sdata, req, &sched_scan_ies);
940 if (ret == 0)
941 rcu_assign_pointer(local->sched_scan_sdata, sdata);
942
943out_free:
944 while (i > 0)
945 kfree(sched_scan_ies.ie[--i]);
946out:
947 mutex_unlock(&local->mtx);
948 return ret;
949}
950
951int ieee80211_request_sched_scan_stop(struct ieee80211_sub_if_data *sdata)
952{
953 struct ieee80211_local *local = sdata->local;
954 int ret = 0;
955
956 mutex_lock(&local->mtx);
957
958 if (!local->ops->sched_scan_stop) {
959 ret = -ENOTSUPP;
960 goto out;
961 }
962
963 if (rcu_access_pointer(local->sched_scan_sdata))
964 drv_sched_scan_stop(local, sdata);
965
966out:
967 mutex_unlock(&local->mtx);
968
969 return ret;
970}
971
972void ieee80211_sched_scan_results(struct ieee80211_hw *hw)
973{
974 struct ieee80211_local *local = hw_to_local(hw);
975
976 trace_api_sched_scan_results(local);
977
978 cfg80211_sched_scan_results(hw->wiphy);
979}
980EXPORT_SYMBOL(ieee80211_sched_scan_results);
981
982void ieee80211_sched_scan_stopped_work(struct work_struct *work)
983{
984 struct ieee80211_local *local =
985 container_of(work, struct ieee80211_local,
986 sched_scan_stopped_work);
987
988 mutex_lock(&local->mtx);
989
990 if (!rcu_access_pointer(local->sched_scan_sdata)) {
991 mutex_unlock(&local->mtx);
992 return;
993 }
994
995 rcu_assign_pointer(local->sched_scan_sdata, NULL);
996
997 mutex_unlock(&local->mtx);
998
999 cfg80211_sched_scan_stopped(local->hw.wiphy);
1000}
1001
1002void ieee80211_sched_scan_stopped(struct ieee80211_hw *hw)
1003{
1004 struct ieee80211_local *local = hw_to_local(hw);
1005
1006 trace_api_sched_scan_stopped(local);
1007
1008 ieee80211_queue_work(&local->hw, &local->sched_scan_stopped_work);
1009}
1010EXPORT_SYMBOL(ieee80211_sched_scan_stopped);
1011