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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 / 8)
31
32static void ieee80211_rx_bss_free(struct cfg80211_bss *cbss)
33{
34 struct ieee80211_bss *bss = (void *)cbss->priv;
35
36 kfree(bss_mesh_id(bss));
37 kfree(bss_mesh_cfg(bss));
38}
39
40void ieee80211_rx_bss_put(struct ieee80211_local *local,
41 struct ieee80211_bss *bss)
42{
43 if (!bss)
44 return;
45 cfg80211_put_bss(container_of((void *)bss, struct cfg80211_bss, priv));
46}
47
48static bool is_uapsd_supported(struct ieee802_11_elems *elems)
49{
50 u8 qos_info;
51
52 if (elems->wmm_info && elems->wmm_info_len == 7
53 && elems->wmm_info[5] == 1)
54 qos_info = elems->wmm_info[6];
55 else if (elems->wmm_param && elems->wmm_param_len == 24
56 && elems->wmm_param[5] == 1)
57 qos_info = elems->wmm_param[6];
58 else
59
60 return false;
61
62 return qos_info & IEEE80211_WMM_IE_AP_QOSINFO_UAPSD;
63}
64
65struct ieee80211_bss *
66ieee80211_bss_info_update(struct ieee80211_local *local,
67 struct ieee80211_rx_status *rx_status,
68 struct ieee80211_mgmt *mgmt,
69 size_t len,
70 struct ieee802_11_elems *elems,
71 struct ieee80211_channel *channel,
72 bool beacon)
73{
74 struct cfg80211_bss *cbss;
75 struct ieee80211_bss *bss;
76 int clen, srlen;
77 s32 signal = 0;
78
79 if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
80 signal = rx_status->signal * 100;
81 else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
82 signal = (rx_status->signal * 100) / local->hw.max_signal;
83
84 cbss = cfg80211_inform_bss_frame(local->hw.wiphy, channel,
85 mgmt, len, signal, GFP_ATOMIC);
86 if (!cbss)
87 return NULL;
88
89 cbss->free_priv = ieee80211_rx_bss_free;
90 bss = (void *)cbss->priv;
91
92 bss->device_ts = rx_status->device_timestamp;
93
94 if (elems->parse_error) {
95 if (beacon)
96 bss->corrupt_data |= IEEE80211_BSS_CORRUPT_BEACON;
97 else
98 bss->corrupt_data |= IEEE80211_BSS_CORRUPT_PROBE_RESP;
99 } else {
100 if (beacon)
101 bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_BEACON;
102 else
103 bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_PROBE_RESP;
104 }
105
106
107 if (elems->erp_info && elems->erp_info_len >= 1 &&
108 (!elems->parse_error ||
109 !(bss->valid_data & IEEE80211_BSS_VALID_ERP))) {
110 bss->erp_value = elems->erp_info[0];
111 bss->has_erp_value = true;
112 if (!elems->parse_error)
113 bss->valid_data |= IEEE80211_BSS_VALID_ERP;
114 }
115
116 if (elems->tim && (!elems->parse_error ||
117 !(bss->valid_data & IEEE80211_BSS_VALID_DTIM))) {
118 struct ieee80211_tim_ie *tim_ie = elems->tim;
119 bss->dtim_period = tim_ie->dtim_period;
120 if (!elems->parse_error)
121 bss->valid_data |= IEEE80211_BSS_VALID_DTIM;
122 }
123
124
125 if (beacon && !bss->dtim_period)
126 bss->dtim_period = 1;
127
128
129 if (!elems->parse_error ||
130 !(bss->valid_data & IEEE80211_BSS_VALID_RATES)) {
131 srlen = 0;
132 if (elems->supp_rates) {
133 clen = IEEE80211_MAX_SUPP_RATES;
134 if (clen > elems->supp_rates_len)
135 clen = elems->supp_rates_len;
136 memcpy(bss->supp_rates, elems->supp_rates, clen);
137 srlen += clen;
138 }
139 if (elems->ext_supp_rates) {
140 clen = IEEE80211_MAX_SUPP_RATES - srlen;
141 if (clen > elems->ext_supp_rates_len)
142 clen = elems->ext_supp_rates_len;
143 memcpy(bss->supp_rates + srlen, elems->ext_supp_rates,
144 clen);
145 srlen += clen;
146 }
147 if (srlen) {
148 bss->supp_rates_len = srlen;
149 if (!elems->parse_error)
150 bss->valid_data |= IEEE80211_BSS_VALID_RATES;
151 }
152 }
153
154 if (!elems->parse_error ||
155 !(bss->valid_data & IEEE80211_BSS_VALID_WMM)) {
156 bss->wmm_used = elems->wmm_param || elems->wmm_info;
157 bss->uapsd_supported = is_uapsd_supported(elems);
158 if (!elems->parse_error)
159 bss->valid_data |= IEEE80211_BSS_VALID_WMM;
160 }
161
162 if (!beacon)
163 bss->last_probe_resp = jiffies;
164
165 return bss;
166}
167
168void ieee80211_scan_rx(struct ieee80211_local *local, struct sk_buff *skb)
169{
170 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
171 struct ieee80211_sub_if_data *sdata1, *sdata2;
172 struct ieee80211_mgmt *mgmt = (void *)skb->data;
173 struct ieee80211_bss *bss;
174 u8 *elements;
175 struct ieee80211_channel *channel;
176 size_t baselen;
177 int freq;
178 bool beacon;
179 struct ieee802_11_elems elems;
180
181 if (skb->len < 24 ||
182 (!ieee80211_is_probe_resp(mgmt->frame_control) &&
183 !ieee80211_is_beacon(mgmt->frame_control)))
184 return;
185
186 sdata1 = rcu_dereference(local->scan_sdata);
187 sdata2 = rcu_dereference(local->sched_scan_sdata);
188
189 if (likely(!sdata1 && !sdata2))
190 return;
191
192 if (ieee80211_is_probe_resp(mgmt->frame_control)) {
193
194 if ((!sdata1 || !ether_addr_equal(mgmt->da, sdata1->vif.addr)) &&
195 (!sdata2 || !ether_addr_equal(mgmt->da, sdata2->vif.addr)))
196 return;
197
198 elements = mgmt->u.probe_resp.variable;
199 baselen = offsetof(struct ieee80211_mgmt, u.probe_resp.variable);
200 beacon = false;
201 } else {
202 baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable);
203 elements = mgmt->u.beacon.variable;
204 beacon = true;
205 }
206
207 if (baselen > skb->len)
208 return;
209
210 ieee802_11_parse_elems(elements, skb->len - baselen, &elems);
211
212 if (elems.ds_params && elems.ds_params_len == 1)
213 freq = ieee80211_channel_to_frequency(elems.ds_params[0],
214 rx_status->band);
215 else
216 freq = rx_status->freq;
217
218 channel = ieee80211_get_channel(local->hw.wiphy, freq);
219
220 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
221 return;
222
223 bss = ieee80211_bss_info_update(local, rx_status,
224 mgmt, skb->len, &elems,
225 channel, beacon);
226 if (bss)
227 ieee80211_rx_bss_put(local, bss);
228}
229
230
231static bool ieee80211_prep_hw_scan(struct ieee80211_local *local)
232{
233 struct cfg80211_scan_request *req = local->scan_req;
234 enum ieee80211_band band;
235 int i, ielen, n_chans;
236
237 do {
238 if (local->hw_scan_band == IEEE80211_NUM_BANDS)
239 return false;
240
241 band = local->hw_scan_band;
242 n_chans = 0;
243 for (i = 0; i < req->n_channels; i++) {
244 if (req->channels[i]->band == band) {
245 local->hw_scan_req->channels[n_chans] =
246 req->channels[i];
247 n_chans++;
248 }
249 }
250
251 local->hw_scan_band++;
252 } while (!n_chans);
253
254 local->hw_scan_req->n_channels = n_chans;
255
256 ielen = ieee80211_build_preq_ies(local, (u8 *)local->hw_scan_req->ie,
257 req->ie, req->ie_len, band,
258 req->rates[band], 0);
259 local->hw_scan_req->ie_len = ielen;
260 local->hw_scan_req->no_cck = req->no_cck;
261
262 return true;
263}
264
265static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted,
266 bool was_hw_scan)
267{
268 struct ieee80211_local *local = hw_to_local(hw);
269
270 lockdep_assert_held(&local->mtx);
271
272
273
274
275
276
277
278 if (WARN_ON(!local->scanning && !aborted))
279 aborted = true;
280
281 if (WARN_ON(!local->scan_req))
282 return;
283
284 if (was_hw_scan && !aborted && ieee80211_prep_hw_scan(local)) {
285 int rc;
286
287 rc = drv_hw_scan(local,
288 rcu_dereference_protected(local->scan_sdata,
289 lockdep_is_held(&local->mtx)),
290 local->hw_scan_req);
291
292 if (rc == 0)
293 return;
294 }
295
296 kfree(local->hw_scan_req);
297 local->hw_scan_req = NULL;
298
299 if (local->scan_req != local->int_scan_req)
300 cfg80211_scan_done(local->scan_req, aborted);
301 local->scan_req = NULL;
302 rcu_assign_pointer(local->scan_sdata, NULL);
303
304 local->scanning = 0;
305 local->scan_channel = NULL;
306
307
308 ieee80211_hw_config(local, 0);
309
310 if (!was_hw_scan) {
311 ieee80211_configure_filter(local);
312 drv_sw_scan_complete(local);
313 ieee80211_offchannel_return(local, true);
314 }
315
316 ieee80211_recalc_idle(local);
317
318 ieee80211_mlme_notify_scan_completed(local);
319 ieee80211_ibss_notify_scan_completed(local);
320 ieee80211_mesh_notify_scan_completed(local);
321 ieee80211_start_next_roc(local);
322}
323
324void ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted)
325{
326 struct ieee80211_local *local = hw_to_local(hw);
327
328 trace_api_scan_completed(local, aborted);
329
330 set_bit(SCAN_COMPLETED, &local->scanning);
331 if (aborted)
332 set_bit(SCAN_ABORTED, &local->scanning);
333 ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0);
334}
335EXPORT_SYMBOL(ieee80211_scan_completed);
336
337static int ieee80211_start_sw_scan(struct ieee80211_local *local)
338{
339
340
341
342
343
344
345
346
347
348
349
350
351
352 drv_sw_scan_start(local);
353
354 local->leave_oper_channel_time = jiffies;
355 local->next_scan_state = SCAN_DECISION;
356 local->scan_channel_idx = 0;
357
358 ieee80211_offchannel_stop_vifs(local, true);
359
360 ieee80211_configure_filter(local);
361
362
363 ieee80211_hw_config(local, 0);
364
365 ieee80211_queue_delayed_work(&local->hw,
366 &local->scan_work, 0);
367
368 return 0;
369}
370
371static bool ieee80211_can_scan(struct ieee80211_local *local,
372 struct ieee80211_sub_if_data *sdata)
373{
374 if (!list_empty(&local->roc_list))
375 return false;
376
377 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
378 sdata->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
379 IEEE80211_STA_CONNECTION_POLL))
380 return false;
381
382 return true;
383}
384
385void ieee80211_run_deferred_scan(struct ieee80211_local *local)
386{
387 lockdep_assert_held(&local->mtx);
388
389 if (!local->scan_req || local->scanning)
390 return;
391
392 if (!ieee80211_can_scan(local,
393 rcu_dereference_protected(
394 local->scan_sdata,
395 lockdep_is_held(&local->mtx))))
396 return;
397
398 ieee80211_queue_delayed_work(&local->hw, &local->scan_work,
399 round_jiffies_relative(0));
400}
401
402static void ieee80211_scan_state_send_probe(struct ieee80211_local *local,
403 unsigned long *next_delay)
404{
405 int i;
406 struct ieee80211_sub_if_data *sdata;
407 enum ieee80211_band band = local->hw.conf.channel->band;
408
409 sdata = rcu_dereference_protected(local->scan_sdata,
410 lockdep_is_held(&local->mtx));
411
412 for (i = 0; i < local->scan_req->n_ssids; i++)
413 ieee80211_send_probe_req(
414 sdata, NULL,
415 local->scan_req->ssids[i].ssid,
416 local->scan_req->ssids[i].ssid_len,
417 local->scan_req->ie, local->scan_req->ie_len,
418 local->scan_req->rates[band], false,
419 local->scan_req->no_cck,
420 local->hw.conf.channel);
421
422
423
424
425
426 *next_delay = IEEE80211_CHANNEL_TIME;
427 local->next_scan_state = SCAN_DECISION;
428}
429
430static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata,
431 struct cfg80211_scan_request *req)
432{
433 struct ieee80211_local *local = sdata->local;
434 int rc;
435
436 lockdep_assert_held(&local->mtx);
437
438 if (local->scan_req)
439 return -EBUSY;
440
441 if (!ieee80211_can_scan(local, sdata)) {
442
443 local->scan_req = req;
444 rcu_assign_pointer(local->scan_sdata, sdata);
445 return 0;
446 }
447
448 if (local->ops->hw_scan) {
449 u8 *ies;
450
451 local->hw_scan_req = kmalloc(
452 sizeof(*local->hw_scan_req) +
453 req->n_channels * sizeof(req->channels[0]) +
454 2 + IEEE80211_MAX_SSID_LEN + local->scan_ies_len +
455 req->ie_len, GFP_KERNEL);
456 if (!local->hw_scan_req)
457 return -ENOMEM;
458
459 local->hw_scan_req->ssids = req->ssids;
460 local->hw_scan_req->n_ssids = req->n_ssids;
461 ies = (u8 *)local->hw_scan_req +
462 sizeof(*local->hw_scan_req) +
463 req->n_channels * sizeof(req->channels[0]);
464 local->hw_scan_req->ie = ies;
465
466 local->hw_scan_band = 0;
467
468
469
470
471
472
473
474
475 }
476
477 local->scan_req = req;
478 rcu_assign_pointer(local->scan_sdata, sdata);
479
480 if (local->ops->hw_scan) {
481 __set_bit(SCAN_HW_SCANNING, &local->scanning);
482 } else if ((req->n_channels == 1) &&
483 (req->channels[0] == local->oper_channel)) {
484
485
486
487
488 unsigned long next_delay;
489
490 __set_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
491
492 ieee80211_recalc_idle(local);
493
494
495
496 drv_sw_scan_start(local);
497
498 ieee80211_configure_filter(local);
499
500
501 ieee80211_hw_config(local, 0);
502
503 if ((req->channels[0]->flags &
504 IEEE80211_CHAN_PASSIVE_SCAN) ||
505 !local->scan_req->n_ssids) {
506 next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
507 } else {
508 ieee80211_scan_state_send_probe(local, &next_delay);
509 next_delay = IEEE80211_CHANNEL_TIME;
510 }
511
512
513 ieee80211_queue_delayed_work(&local->hw, &local->scan_work,
514 next_delay);
515 return 0;
516 } else {
517
518 __set_bit(SCAN_SW_SCANNING, &local->scanning);
519 }
520
521 ieee80211_recalc_idle(local);
522
523 if (local->ops->hw_scan) {
524 WARN_ON(!ieee80211_prep_hw_scan(local));
525 rc = drv_hw_scan(local, sdata, local->hw_scan_req);
526 } else
527 rc = ieee80211_start_sw_scan(local);
528
529 if (rc) {
530 kfree(local->hw_scan_req);
531 local->hw_scan_req = NULL;
532 local->scanning = 0;
533
534 ieee80211_recalc_idle(local);
535
536 local->scan_req = NULL;
537 rcu_assign_pointer(local->scan_sdata, NULL);
538 }
539
540 return rc;
541}
542
543static unsigned long
544ieee80211_scan_get_channel_time(struct ieee80211_channel *chan)
545{
546
547
548
549
550 if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN)
551 return IEEE80211_PASSIVE_CHANNEL_TIME;
552 return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME;
553}
554
555static void ieee80211_scan_state_decision(struct ieee80211_local *local,
556 unsigned long *next_delay)
557{
558 bool associated = false;
559 bool tx_empty = true;
560 bool bad_latency;
561 bool listen_int_exceeded;
562 unsigned long min_beacon_int = 0;
563 struct ieee80211_sub_if_data *sdata;
564 struct ieee80211_channel *next_chan;
565
566
567
568
569
570
571 mutex_lock(&local->iflist_mtx);
572 list_for_each_entry(sdata, &local->interfaces, list) {
573 if (!ieee80211_sdata_running(sdata))
574 continue;
575
576 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
577 if (sdata->u.mgd.associated) {
578 associated = true;
579
580 if (sdata->vif.bss_conf.beacon_int <
581 min_beacon_int || min_beacon_int == 0)
582 min_beacon_int =
583 sdata->vif.bss_conf.beacon_int;
584
585 if (!qdisc_all_tx_empty(sdata->dev)) {
586 tx_empty = false;
587 break;
588 }
589 }
590 }
591 }
592 mutex_unlock(&local->iflist_mtx);
593
594 next_chan = local->scan_req->channels[local->scan_channel_idx];
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612 bad_latency = time_after(jiffies +
613 ieee80211_scan_get_channel_time(next_chan),
614 local->leave_oper_channel_time +
615 usecs_to_jiffies(pm_qos_request(PM_QOS_NETWORK_LATENCY)));
616
617 listen_int_exceeded = time_after(jiffies +
618 ieee80211_scan_get_channel_time(next_chan),
619 local->leave_oper_channel_time +
620 usecs_to_jiffies(min_beacon_int * 1024) *
621 local->hw.conf.listen_interval);
622
623 if (associated && (!tx_empty || bad_latency || listen_int_exceeded))
624 local->next_scan_state = SCAN_SUSPEND;
625 else
626 local->next_scan_state = SCAN_SET_CHANNEL;
627
628 *next_delay = 0;
629}
630
631static void ieee80211_scan_state_set_channel(struct ieee80211_local *local,
632 unsigned long *next_delay)
633{
634 int skip;
635 struct ieee80211_channel *chan;
636
637 skip = 0;
638 chan = local->scan_req->channels[local->scan_channel_idx];
639
640 local->scan_channel = chan;
641
642 if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL))
643 skip = 1;
644
645
646 local->scan_channel_idx++;
647
648 if (skip) {
649
650 local->next_scan_state = SCAN_DECISION;
651 return;
652 }
653
654
655
656
657
658
659
660
661
662
663
664 if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN ||
665 !local->scan_req->n_ssids) {
666 *next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
667 local->next_scan_state = SCAN_DECISION;
668 return;
669 }
670
671
672 *next_delay = IEEE80211_PROBE_DELAY;
673 local->next_scan_state = SCAN_SEND_PROBE;
674}
675
676static void ieee80211_scan_state_suspend(struct ieee80211_local *local,
677 unsigned long *next_delay)
678{
679
680 local->scan_channel = NULL;
681 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
682
683
684
685
686
687
688 ieee80211_offchannel_return(local, false);
689
690 *next_delay = HZ / 5;
691
692 local->next_scan_state = SCAN_RESUME;
693}
694
695static void ieee80211_scan_state_resume(struct ieee80211_local *local,
696 unsigned long *next_delay)
697{
698
699 ieee80211_offchannel_stop_vifs(local, false);
700
701 if (local->ops->flush) {
702 drv_flush(local, false);
703 *next_delay = 0;
704 } else
705 *next_delay = HZ / 10;
706
707
708 local->leave_oper_channel_time = jiffies;
709
710
711 local->next_scan_state = SCAN_SET_CHANNEL;
712}
713
714void ieee80211_scan_work(struct work_struct *work)
715{
716 struct ieee80211_local *local =
717 container_of(work, struct ieee80211_local, scan_work.work);
718 struct ieee80211_sub_if_data *sdata;
719 unsigned long next_delay = 0;
720 bool aborted, hw_scan;
721
722 mutex_lock(&local->mtx);
723
724 sdata = rcu_dereference_protected(local->scan_sdata,
725 lockdep_is_held(&local->mtx));
726
727
728 if (test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning)) {
729 aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning);
730 goto out_complete;
731 }
732
733 if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) {
734 aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning);
735 goto out_complete;
736 }
737
738 if (!sdata || !local->scan_req)
739 goto out;
740
741 if (local->scan_req && !local->scanning) {
742 struct cfg80211_scan_request *req = local->scan_req;
743 int rc;
744
745 local->scan_req = NULL;
746 rcu_assign_pointer(local->scan_sdata, NULL);
747
748 rc = __ieee80211_start_scan(sdata, req);
749 if (rc) {
750
751 local->scan_req = req;
752 aborted = true;
753 goto out_complete;
754 } else
755 goto out;
756 }
757
758
759
760
761 if (!ieee80211_sdata_running(sdata)) {
762 aborted = true;
763 goto out_complete;
764 }
765
766
767
768
769
770 do {
771 if (!ieee80211_sdata_running(sdata)) {
772 aborted = true;
773 goto out_complete;
774 }
775
776 switch (local->next_scan_state) {
777 case SCAN_DECISION:
778
779 if (local->scan_channel_idx >= local->scan_req->n_channels) {
780 aborted = false;
781 goto out_complete;
782 }
783 ieee80211_scan_state_decision(local, &next_delay);
784 break;
785 case SCAN_SET_CHANNEL:
786 ieee80211_scan_state_set_channel(local, &next_delay);
787 break;
788 case SCAN_SEND_PROBE:
789 ieee80211_scan_state_send_probe(local, &next_delay);
790 break;
791 case SCAN_SUSPEND:
792 ieee80211_scan_state_suspend(local, &next_delay);
793 break;
794 case SCAN_RESUME:
795 ieee80211_scan_state_resume(local, &next_delay);
796 break;
797 }
798 } while (next_delay == 0);
799
800 ieee80211_queue_delayed_work(&local->hw, &local->scan_work, next_delay);
801 goto out;
802
803out_complete:
804 hw_scan = test_bit(SCAN_HW_SCANNING, &local->scanning);
805 __ieee80211_scan_completed(&local->hw, aborted, hw_scan);
806out:
807 mutex_unlock(&local->mtx);
808}
809
810int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata,
811 struct cfg80211_scan_request *req)
812{
813 int res;
814
815 mutex_lock(&sdata->local->mtx);
816 res = __ieee80211_start_scan(sdata, req);
817 mutex_unlock(&sdata->local->mtx);
818
819 return res;
820}
821
822int ieee80211_request_internal_scan(struct ieee80211_sub_if_data *sdata,
823 const u8 *ssid, u8 ssid_len,
824 struct ieee80211_channel *chan)
825{
826 struct ieee80211_local *local = sdata->local;
827 int ret = -EBUSY;
828 enum ieee80211_band band;
829
830 mutex_lock(&local->mtx);
831
832
833 if (local->scan_req)
834 goto unlock;
835
836
837 if (!chan) {
838 int i, nchan = 0;
839
840 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
841 if (!local->hw.wiphy->bands[band])
842 continue;
843 for (i = 0;
844 i < local->hw.wiphy->bands[band]->n_channels;
845 i++) {
846 local->int_scan_req->channels[nchan] =
847 &local->hw.wiphy->bands[band]->channels[i];
848 nchan++;
849 }
850 }
851
852 local->int_scan_req->n_channels = nchan;
853 } else {
854 local->int_scan_req->channels[0] = chan;
855 local->int_scan_req->n_channels = 1;
856 }
857
858 local->int_scan_req->ssids = &local->scan_ssid;
859 local->int_scan_req->n_ssids = 1;
860 memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN);
861 local->int_scan_req->ssids[0].ssid_len = ssid_len;
862
863 ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req);
864 unlock:
865 mutex_unlock(&local->mtx);
866 return ret;
867}
868
869
870
871
872void ieee80211_scan_cancel(struct ieee80211_local *local)
873{
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892 mutex_lock(&local->mtx);
893 if (!local->scan_req)
894 goto out;
895
896 if (test_bit(SCAN_HW_SCANNING, &local->scanning)) {
897 if (local->ops->cancel_hw_scan)
898 drv_cancel_hw_scan(local,
899 rcu_dereference_protected(local->scan_sdata,
900 lockdep_is_held(&local->mtx)));
901 goto out;
902 }
903
904
905
906
907
908
909 cancel_delayed_work(&local->scan_work);
910
911 __ieee80211_scan_completed(&local->hw, true, false);
912out:
913 mutex_unlock(&local->mtx);
914}
915
916int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata,
917 struct cfg80211_sched_scan_request *req)
918{
919 struct ieee80211_local *local = sdata->local;
920 struct ieee80211_sched_scan_ies sched_scan_ies = {};
921 int ret, i;
922
923 mutex_lock(&local->mtx);
924
925 if (rcu_access_pointer(local->sched_scan_sdata)) {
926 ret = -EBUSY;
927 goto out;
928 }
929
930 if (!local->ops->sched_scan_start) {
931 ret = -ENOTSUPP;
932 goto out;
933 }
934
935 for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
936 if (!local->hw.wiphy->bands[i])
937 continue;
938
939 sched_scan_ies.ie[i] = kzalloc(2 + IEEE80211_MAX_SSID_LEN +
940 local->scan_ies_len +
941 req->ie_len,
942 GFP_KERNEL);
943 if (!sched_scan_ies.ie[i]) {
944 ret = -ENOMEM;
945 goto out_free;
946 }
947
948 sched_scan_ies.len[i] =
949 ieee80211_build_preq_ies(local, sched_scan_ies.ie[i],
950 req->ie, req->ie_len, i,
951 (u32) -1, 0);
952 }
953
954 ret = drv_sched_scan_start(local, sdata, req, &sched_scan_ies);
955 if (ret == 0)
956 rcu_assign_pointer(local->sched_scan_sdata, sdata);
957
958out_free:
959 while (i > 0)
960 kfree(sched_scan_ies.ie[--i]);
961out:
962 mutex_unlock(&local->mtx);
963 return ret;
964}
965
966int ieee80211_request_sched_scan_stop(struct ieee80211_sub_if_data *sdata)
967{
968 struct ieee80211_local *local = sdata->local;
969 int ret = 0;
970
971 mutex_lock(&local->mtx);
972
973 if (!local->ops->sched_scan_stop) {
974 ret = -ENOTSUPP;
975 goto out;
976 }
977
978 if (rcu_access_pointer(local->sched_scan_sdata))
979 drv_sched_scan_stop(local, sdata);
980
981out:
982 mutex_unlock(&local->mtx);
983
984 return ret;
985}
986
987void ieee80211_sched_scan_results(struct ieee80211_hw *hw)
988{
989 struct ieee80211_local *local = hw_to_local(hw);
990
991 trace_api_sched_scan_results(local);
992
993 cfg80211_sched_scan_results(hw->wiphy);
994}
995EXPORT_SYMBOL(ieee80211_sched_scan_results);
996
997void ieee80211_sched_scan_stopped_work(struct work_struct *work)
998{
999 struct ieee80211_local *local =
1000 container_of(work, struct ieee80211_local,
1001 sched_scan_stopped_work);
1002
1003 mutex_lock(&local->mtx);
1004
1005 if (!rcu_access_pointer(local->sched_scan_sdata)) {
1006 mutex_unlock(&local->mtx);
1007 return;
1008 }
1009
1010 rcu_assign_pointer(local->sched_scan_sdata, NULL);
1011
1012 mutex_unlock(&local->mtx);
1013
1014 cfg80211_sched_scan_stopped(local->hw.wiphy);
1015}
1016
1017void ieee80211_sched_scan_stopped(struct ieee80211_hw *hw)
1018{
1019 struct ieee80211_local *local = hw_to_local(hw);
1020
1021 trace_api_sched_scan_stopped(local);
1022
1023 ieee80211_queue_work(&local->hw, &local->sched_scan_stopped_work);
1024}
1025EXPORT_SYMBOL(ieee80211_sched_scan_stopped);
1026