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media: vicodec: add V4L2_CID_MIN_BUFFERS_FOR_OUTPUT
[linux/fpc-iii.git] / net / mac80211 / scan.c
blob0cf0667006236ded89bfd3f9946a4ef3e3588ed1
1 /*
2 * Scanning implementation
3 *
4 * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
5 * Copyright 2004, Instant802 Networks, Inc.
6 * Copyright 2005, Devicescape Software, Inc.
7 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
8 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
9 * Copyright 2013-2015 Intel Mobile Communications GmbH
10 * Copyright 2016-2017 Intel Deutschland GmbH
11 * Copyright (C) 2018-2019 Intel Corporation
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License version 2 as
15 * published by the Free Software Foundation.
16 */
17
18 #include <linux/if_arp.h>
19 #include <linux/etherdevice.h>
20 #include <linux/rtnetlink.h>
21 #include <net/sch_generic.h>
22 #include <linux/slab.h>
23 #include <linux/export.h>
24 #include <linux/random.h>
25 #include <net/mac80211.h>
26
27 #include "ieee80211_i.h"
28 #include "driver-ops.h"
29 #include "mesh.h"
30
31 #define IEEE80211_PROBE_DELAY (HZ / 33)
32 #define IEEE80211_CHANNEL_TIME (HZ / 33)
33 #define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 9)
34
35 void ieee80211_rx_bss_put(struct ieee80211_local *local,
36 struct ieee80211_bss *bss)
37 {
38 if (!bss)
39 return;
40 cfg80211_put_bss(local->hw.wiphy,
41 container_of((void *)bss, struct cfg80211_bss, priv));
42 }
43
44 static bool is_uapsd_supported(struct ieee802_11_elems *elems)
45 {
46 u8 qos_info;
47
48 if (elems->wmm_info && elems->wmm_info_len == 7
49 && elems->wmm_info[5] == 1)
50 qos_info = elems->wmm_info[6];
51 else if (elems->wmm_param && elems->wmm_param_len == 24
52 && elems->wmm_param[5] == 1)
53 qos_info = elems->wmm_param[6];
54 else
55 /* no valid wmm information or parameter element found */
56 return false;
57
58 return qos_info & IEEE80211_WMM_IE_AP_QOSINFO_UAPSD;
59 }
60
61 static void
62 ieee80211_update_bss_from_elems(struct ieee80211_local *local,
63 struct ieee80211_bss *bss,
64 struct ieee802_11_elems *elems,
65 struct ieee80211_rx_status *rx_status,
66 bool beacon)
67 {
68 int clen, srlen;
69
70 if (beacon)
71 bss->device_ts_beacon = rx_status->device_timestamp;
72 else
73 bss->device_ts_presp = rx_status->device_timestamp;
74
75 if (elems->parse_error) {
76 if (beacon)
77 bss->corrupt_data |= IEEE80211_BSS_CORRUPT_BEACON;
78 else
79 bss->corrupt_data |= IEEE80211_BSS_CORRUPT_PROBE_RESP;
80 } else {
81 if (beacon)
82 bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_BEACON;
83 else
84 bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_PROBE_RESP;
85 }
86
87 /* save the ERP value so that it is available at association time */
88 if (elems->erp_info && (!elems->parse_error ||
89 !(bss->valid_data & IEEE80211_BSS_VALID_ERP))) {
90 bss->erp_value = elems->erp_info[0];
91 bss->has_erp_value = true;
92 if (!elems->parse_error)
93 bss->valid_data |= IEEE80211_BSS_VALID_ERP;
94 }
95
96 /* replace old supported rates if we get new values */
97 if (!elems->parse_error ||
98 !(bss->valid_data & IEEE80211_BSS_VALID_RATES)) {
99 srlen = 0;
100 if (elems->supp_rates) {
101 clen = IEEE80211_MAX_SUPP_RATES;
102 if (clen > elems->supp_rates_len)
103 clen = elems->supp_rates_len;
104 memcpy(bss->supp_rates, elems->supp_rates, clen);
105 srlen += clen;
106 }
107 if (elems->ext_supp_rates) {
108 clen = IEEE80211_MAX_SUPP_RATES - srlen;
109 if (clen > elems->ext_supp_rates_len)
110 clen = elems->ext_supp_rates_len;
111 memcpy(bss->supp_rates + srlen, elems->ext_supp_rates,
112 clen);
113 srlen += clen;
114 }
115 if (srlen) {
116 bss->supp_rates_len = srlen;
117 if (!elems->parse_error)
118 bss->valid_data |= IEEE80211_BSS_VALID_RATES;
119 }
120 }
121
122 if (!elems->parse_error ||
123 !(bss->valid_data & IEEE80211_BSS_VALID_WMM)) {
124 bss->wmm_used = elems->wmm_param || elems->wmm_info;
125 bss->uapsd_supported = is_uapsd_supported(elems);
126 if (!elems->parse_error)
127 bss->valid_data |= IEEE80211_BSS_VALID_WMM;
128 }
129
130 if (beacon) {
131 struct ieee80211_supported_band *sband =
132 local->hw.wiphy->bands[rx_status->band];
133 if (!(rx_status->encoding == RX_ENC_HT) &&
134 !(rx_status->encoding == RX_ENC_VHT))
135 bss->beacon_rate =
136 &sband->bitrates[rx_status->rate_idx];
137 }
138 }
139
140 struct ieee80211_bss *
141 ieee80211_bss_info_update(struct ieee80211_local *local,
142 struct ieee80211_rx_status *rx_status,
143 struct ieee80211_mgmt *mgmt, size_t len,
144 struct ieee80211_channel *channel)
145 {
146 bool beacon = ieee80211_is_beacon(mgmt->frame_control);
147 struct cfg80211_bss *cbss, *non_tx_cbss;
148 struct ieee80211_bss *bss, *non_tx_bss;
149 struct cfg80211_inform_bss bss_meta = {
150 .boottime_ns = rx_status->boottime_ns,
151 };
152 bool signal_valid;
153 struct ieee80211_sub_if_data *scan_sdata;
154 struct ieee802_11_elems elems;
155 size_t baselen;
156 u8 *elements;
157
158 if (rx_status->flag & RX_FLAG_NO_SIGNAL_VAL)
159 bss_meta.signal = 0; /* invalid signal indication */
160 else if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
161 bss_meta.signal = rx_status->signal * 100;
162 else if (ieee80211_hw_check(&local->hw, SIGNAL_UNSPEC))
163 bss_meta.signal = (rx_status->signal * 100) / local->hw.max_signal;
164
165 bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_20;
166 if (rx_status->bw == RATE_INFO_BW_5)
167 bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_5;
168 else if (rx_status->bw == RATE_INFO_BW_10)
169 bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_10;
170
171 bss_meta.chan = channel;
172
173 rcu_read_lock();
174 scan_sdata = rcu_dereference(local->scan_sdata);
175 if (scan_sdata && scan_sdata->vif.type == NL80211_IFTYPE_STATION &&
176 scan_sdata->vif.bss_conf.assoc &&
177 ieee80211_have_rx_timestamp(rx_status)) {
178 bss_meta.parent_tsf =
179 ieee80211_calculate_rx_timestamp(local, rx_status,
180 len + FCS_LEN, 24);
181 ether_addr_copy(bss_meta.parent_bssid,
182 scan_sdata->vif.bss_conf.bssid);
183 }
184 rcu_read_unlock();
185
186 cbss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta,
187 mgmt, len, GFP_ATOMIC);
188 if (!cbss)
189 return NULL;
190
191 if (ieee80211_is_probe_resp(mgmt->frame_control)) {
192 elements = mgmt->u.probe_resp.variable;
193 baselen = offsetof(struct ieee80211_mgmt,
194 u.probe_resp.variable);
195 } else {
196 baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable);
197 elements = mgmt->u.beacon.variable;
198 }
199
200 if (baselen > len)
201 return NULL;
202
203 ieee802_11_parse_elems(elements, len - baselen, false, &elems,
204 mgmt->bssid, cbss->bssid);
205
206 /* In case the signal is invalid update the status */
207 signal_valid = abs(channel->center_freq - cbss->channel->center_freq)
208 <= local->hw.wiphy->max_adj_channel_rssi_comp;
209 if (!signal_valid)
210 rx_status->flag |= RX_FLAG_NO_SIGNAL_VAL;
211
212 bss = (void *)cbss->priv;
213 ieee80211_update_bss_from_elems(local, bss, &elems, rx_status, beacon);
214
215 list_for_each_entry(non_tx_cbss, &cbss->nontrans_list, nontrans_list) {
216 non_tx_bss = (void *)non_tx_cbss->priv;
217
218 ieee80211_update_bss_from_elems(local, non_tx_bss, &elems,
219 rx_status, beacon);
220 }
221
222 return bss;
223 }
224
225 static bool ieee80211_scan_accept_presp(struct ieee80211_sub_if_data *sdata,
226 u32 scan_flags, const u8 *da)
227 {
228 if (!sdata)
229 return false;
230 /* accept broadcast for OCE */
231 if (scan_flags & NL80211_SCAN_FLAG_ACCEPT_BCAST_PROBE_RESP &&
232 is_broadcast_ether_addr(da))
233 return true;
234 if (scan_flags & NL80211_SCAN_FLAG_RANDOM_ADDR)
235 return true;
236 return ether_addr_equal(da, sdata->vif.addr);
237 }
238
239 void ieee80211_scan_rx(struct ieee80211_local *local, struct sk_buff *skb)
240 {
241 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
242 struct ieee80211_sub_if_data *sdata1, *sdata2;
243 struct ieee80211_mgmt *mgmt = (void *)skb->data;
244 struct ieee80211_bss *bss;
245 struct ieee80211_channel *channel;
246
247 if (skb->len < 24 ||
248 (!ieee80211_is_probe_resp(mgmt->frame_control) &&
249 !ieee80211_is_beacon(mgmt->frame_control)))
250 return;
251
252 sdata1 = rcu_dereference(local->scan_sdata);
253 sdata2 = rcu_dereference(local->sched_scan_sdata);
254
255 if (likely(!sdata1 && !sdata2))
256 return;
257
258 if (ieee80211_is_probe_resp(mgmt->frame_control)) {
259 struct cfg80211_scan_request *scan_req;
260 struct cfg80211_sched_scan_request *sched_scan_req;
261 u32 scan_req_flags = 0, sched_scan_req_flags = 0;
262
263 scan_req = rcu_dereference(local->scan_req);
264 sched_scan_req = rcu_dereference(local->sched_scan_req);
265
266 if (scan_req)
267 scan_req_flags = scan_req->flags;
268
269 if (sched_scan_req)
270 sched_scan_req_flags = sched_scan_req->flags;
271
272 /* ignore ProbeResp to foreign address or non-bcast (OCE)
273 * unless scanning with randomised address
274 */
275 if (!ieee80211_scan_accept_presp(sdata1, scan_req_flags,
276 mgmt->da) &&
277 !ieee80211_scan_accept_presp(sdata2, sched_scan_req_flags,
278 mgmt->da))
279 return;
280 }
281
282 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
283
284 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
285 return;
286
287 bss = ieee80211_bss_info_update(local, rx_status,
288 mgmt, skb->len,
289 channel);
290 if (bss)
291 ieee80211_rx_bss_put(local, bss);
292 }
293
294 static void
295 ieee80211_prepare_scan_chandef(struct cfg80211_chan_def *chandef,
296 enum nl80211_bss_scan_width scan_width)
297 {
298 memset(chandef, 0, sizeof(*chandef));
299 switch (scan_width) {
300 case NL80211_BSS_CHAN_WIDTH_5:
301 chandef->width = NL80211_CHAN_WIDTH_5;
302 break;
303 case NL80211_BSS_CHAN_WIDTH_10:
304 chandef->width = NL80211_CHAN_WIDTH_10;
305 break;
306 default:
307 chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
308 break;
309 }
310 }
311
312 /* return false if no more work */
313 static bool ieee80211_prep_hw_scan(struct ieee80211_local *local)
314 {
315 struct cfg80211_scan_request *req;
316 struct cfg80211_chan_def chandef;
317 u8 bands_used = 0;
318 int i, ielen, n_chans;
319 u32 flags = 0;
320
321 req = rcu_dereference_protected(local->scan_req,
322 lockdep_is_held(&local->mtx));
323
324 if (test_bit(SCAN_HW_CANCELLED, &local->scanning))
325 return false;
326
327 if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) {
328 for (i = 0; i < req->n_channels; i++) {
329 local->hw_scan_req->req.channels[i] = req->channels[i];
330 bands_used |= BIT(req->channels[i]->band);
331 }
332
333 n_chans = req->n_channels;
334 } else {
335 do {
336 if (local->hw_scan_band == NUM_NL80211_BANDS)
337 return false;
338
339 n_chans = 0;
340
341 for (i = 0; i < req->n_channels; i++) {
342 if (req->channels[i]->band !=
343 local->hw_scan_band)
344 continue;
345 local->hw_scan_req->req.channels[n_chans] =
346 req->channels[i];
347 n_chans++;
348 bands_used |= BIT(req->channels[i]->band);
349 }
350
351 local->hw_scan_band++;
352 } while (!n_chans);
353 }
354
355 local->hw_scan_req->req.n_channels = n_chans;
356 ieee80211_prepare_scan_chandef(&chandef, req->scan_width);
357
358 if (req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT)
359 flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT;
360
361 ielen = ieee80211_build_preq_ies(local,
362 (u8 *)local->hw_scan_req->req.ie,
363 local->hw_scan_ies_bufsize,
364 &local->hw_scan_req->ies,
365 req->ie, req->ie_len,
366 bands_used, req->rates, &chandef,
367 flags);
368 local->hw_scan_req->req.ie_len = ielen;
369 local->hw_scan_req->req.no_cck = req->no_cck;
370 ether_addr_copy(local->hw_scan_req->req.mac_addr, req->mac_addr);
371 ether_addr_copy(local->hw_scan_req->req.mac_addr_mask,
372 req->mac_addr_mask);
373 ether_addr_copy(local->hw_scan_req->req.bssid, req->bssid);
374
375 return true;
376 }
377
378 static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted)
379 {
380 struct ieee80211_local *local = hw_to_local(hw);
381 bool hw_scan = test_bit(SCAN_HW_SCANNING, &local->scanning);
382 bool was_scanning = local->scanning;
383 struct cfg80211_scan_request *scan_req;
384 struct ieee80211_sub_if_data *scan_sdata;
385 struct ieee80211_sub_if_data *sdata;
386
387 lockdep_assert_held(&local->mtx);
388
389 /*
390 * It's ok to abort a not-yet-running scan (that
391 * we have one at all will be verified by checking
392 * local->scan_req next), but not to complete it
393 * successfully.
394 */
395 if (WARN_ON(!local->scanning && !aborted))
396 aborted = true;
397
398 if (WARN_ON(!local->scan_req))
399 return;
400
401 if (hw_scan && !aborted &&
402 !ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS) &&
403 ieee80211_prep_hw_scan(local)) {
404 int rc;
405
406 rc = drv_hw_scan(local,
407 rcu_dereference_protected(local->scan_sdata,
408 lockdep_is_held(&local->mtx)),
409 local->hw_scan_req);
410
411 if (rc == 0)
412 return;
413
414 /* HW scan failed and is going to be reported as aborted,
415 * so clear old scan info.
416 */
417 memset(&local->scan_info, 0, sizeof(local->scan_info));
418 aborted = true;
419 }
420
421 kfree(local->hw_scan_req);
422 local->hw_scan_req = NULL;
423
424 scan_req = rcu_dereference_protected(local->scan_req,
425 lockdep_is_held(&local->mtx));
426
427 if (scan_req != local->int_scan_req) {
428 local->scan_info.aborted = aborted;
429 cfg80211_scan_done(scan_req, &local->scan_info);
430 }
431 RCU_INIT_POINTER(local->scan_req, NULL);
432
433 scan_sdata = rcu_dereference_protected(local->scan_sdata,
434 lockdep_is_held(&local->mtx));
435 RCU_INIT_POINTER(local->scan_sdata, NULL);
436
437 local->scanning = 0;
438 local->scan_chandef.chan = NULL;
439
440 /* Set power back to normal operating levels. */
441 ieee80211_hw_config(local, 0);
442
443 if (!hw_scan) {
444 ieee80211_configure_filter(local);
445 drv_sw_scan_complete(local, scan_sdata);
446 ieee80211_offchannel_return(local);
447 }
448
449 ieee80211_recalc_idle(local);
450
451 ieee80211_mlme_notify_scan_completed(local);
452 ieee80211_ibss_notify_scan_completed(local);
453
454 /* Requeue all the work that might have been ignored while
455 * the scan was in progress; if there was none this will
456 * just be a no-op for the particular interface.
457 */
458 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
459 if (ieee80211_sdata_running(sdata))
460 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
461 }
462
463 if (was_scanning)
464 ieee80211_start_next_roc(local);
465 }
466
467 void ieee80211_scan_completed(struct ieee80211_hw *hw,
468 struct cfg80211_scan_info *info)
469 {
470 struct ieee80211_local *local = hw_to_local(hw);
471
472 trace_api_scan_completed(local, info->aborted);
473
474 set_bit(SCAN_COMPLETED, &local->scanning);
475 if (info->aborted)
476 set_bit(SCAN_ABORTED, &local->scanning);
477
478 memcpy(&local->scan_info, info, sizeof(*info));
479
480 ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0);
481 }
482 EXPORT_SYMBOL(ieee80211_scan_completed);
483
484 static int ieee80211_start_sw_scan(struct ieee80211_local *local,
485 struct ieee80211_sub_if_data *sdata)
486 {
487 /* Software scan is not supported in multi-channel cases */
488 if (local->use_chanctx)
489 return -EOPNOTSUPP;
490
491 /*
492 * Hardware/driver doesn't support hw_scan, so use software
493 * scanning instead. First send a nullfunc frame with power save
494 * bit on so that AP will buffer the frames for us while we are not
495 * listening, then send probe requests to each channel and wait for
496 * the responses. After all channels are scanned, tune back to the
497 * original channel and send a nullfunc frame with power save bit
498 * off to trigger the AP to send us all the buffered frames.
499 *
500 * Note that while local->sw_scanning is true everything else but
501 * nullfunc frames and probe requests will be dropped in
502 * ieee80211_tx_h_check_assoc().
503 */
504 drv_sw_scan_start(local, sdata, local->scan_addr);
505
506 local->leave_oper_channel_time = jiffies;
507 local->next_scan_state = SCAN_DECISION;
508 local->scan_channel_idx = 0;
509
510 ieee80211_offchannel_stop_vifs(local);
511
512 /* ensure nullfunc is transmitted before leaving operating channel */
513 ieee80211_flush_queues(local, NULL, false);
514
515 ieee80211_configure_filter(local);
516
517 /* We need to set power level at maximum rate for scanning. */
518 ieee80211_hw_config(local, 0);
519
520 ieee80211_queue_delayed_work(&local->hw,
521 &local->scan_work, 0);
522
523 return 0;
524 }
525
526 static bool ieee80211_can_scan(struct ieee80211_local *local,
527 struct ieee80211_sub_if_data *sdata)
528 {
529 if (ieee80211_is_radar_required(local))
530 return false;
531
532 if (!list_empty(&local->roc_list))
533 return false;
534
535 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
536 sdata->u.mgd.flags & IEEE80211_STA_CONNECTION_POLL)
537 return false;
538
539 return true;
540 }
541
542 void ieee80211_run_deferred_scan(struct ieee80211_local *local)
543 {
544 lockdep_assert_held(&local->mtx);
545
546 if (!local->scan_req || local->scanning)
547 return;
548
549 if (!ieee80211_can_scan(local,
550 rcu_dereference_protected(
551 local->scan_sdata,
552 lockdep_is_held(&local->mtx))))
553 return;
554
555 ieee80211_queue_delayed_work(&local->hw, &local->scan_work,
556 round_jiffies_relative(0));
557 }
558
559 static void ieee80211_send_scan_probe_req(struct ieee80211_sub_if_data *sdata,
560 const u8 *src, const u8 *dst,
561 const u8 *ssid, size_t ssid_len,
562 const u8 *ie, size_t ie_len,
563 u32 ratemask, u32 flags, u32 tx_flags,
564 struct ieee80211_channel *channel)
565 {
566 struct sk_buff *skb;
567 u32 txdata_flags = 0;
568
569 skb = ieee80211_build_probe_req(sdata, src, dst, ratemask, channel,
570 ssid, ssid_len,
571 ie, ie_len, flags);
572
573 if (skb) {
574 if (flags & IEEE80211_PROBE_FLAG_RANDOM_SN) {
575 struct ieee80211_hdr *hdr = (void *)skb->data;
576 u16 sn = get_random_u32();
577
578 txdata_flags |= IEEE80211_TX_NO_SEQNO;
579 hdr->seq_ctrl =
580 cpu_to_le16(IEEE80211_SN_TO_SEQ(sn));
581 }
582 IEEE80211_SKB_CB(skb)->flags |= tx_flags;
583 ieee80211_tx_skb_tid_band(sdata, skb, 7, channel->band,
584 txdata_flags);
585 }
586 }
587
588 static void ieee80211_scan_state_send_probe(struct ieee80211_local *local,
589 unsigned long *next_delay)
590 {
591 int i;
592 struct ieee80211_sub_if_data *sdata;
593 struct cfg80211_scan_request *scan_req;
594 enum nl80211_band band = local->hw.conf.chandef.chan->band;
595 u32 flags = 0, tx_flags;
596
597 scan_req = rcu_dereference_protected(local->scan_req,
598 lockdep_is_held(&local->mtx));
599
600 tx_flags = IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
601 if (scan_req->no_cck)
602 tx_flags |= IEEE80211_TX_CTL_NO_CCK_RATE;
603 if (scan_req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT)
604 flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT;
605 if (scan_req->flags & NL80211_SCAN_FLAG_RANDOM_SN)
606 flags |= IEEE80211_PROBE_FLAG_RANDOM_SN;
607
608 sdata = rcu_dereference_protected(local->scan_sdata,
609 lockdep_is_held(&local->mtx));
610
611 for (i = 0; i < scan_req->n_ssids; i++)
612 ieee80211_send_scan_probe_req(
613 sdata, local->scan_addr, scan_req->bssid,
614 scan_req->ssids[i].ssid, scan_req->ssids[i].ssid_len,
615 scan_req->ie, scan_req->ie_len,
616 scan_req->rates[band], flags,
617 tx_flags, local->hw.conf.chandef.chan);
618
619 /*
620 * After sending probe requests, wait for probe responses
621 * on the channel.
622 */
623 *next_delay = IEEE80211_CHANNEL_TIME;
624 local->next_scan_state = SCAN_DECISION;
625 }
626
627 static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata,
628 struct cfg80211_scan_request *req)
629 {
630 struct ieee80211_local *local = sdata->local;
631 bool hw_scan = local->ops->hw_scan;
632 int rc;
633
634 lockdep_assert_held(&local->mtx);
635
636 if (local->scan_req || ieee80211_is_radar_required(local))
637 return -EBUSY;
638
639 if (!ieee80211_can_scan(local, sdata)) {
640 /* wait for the work to finish/time out */
641 rcu_assign_pointer(local->scan_req, req);
642 rcu_assign_pointer(local->scan_sdata, sdata);
643 return 0;
644 }
645
646 again:
647 if (hw_scan) {
648 u8 *ies;
649
650 local->hw_scan_ies_bufsize = local->scan_ies_len + req->ie_len;
651
652 if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) {
653 int i, n_bands = 0;
654 u8 bands_counted = 0;
655
656 for (i = 0; i < req->n_channels; i++) {
657 if (bands_counted & BIT(req->channels[i]->band))
658 continue;
659 bands_counted |= BIT(req->channels[i]->band);
660 n_bands++;
661 }
662
663 local->hw_scan_ies_bufsize *= n_bands;
664 }
665
666 local->hw_scan_req = kmalloc(
667 sizeof(*local->hw_scan_req) +
668 req->n_channels * sizeof(req->channels[0]) +
669 local->hw_scan_ies_bufsize, GFP_KERNEL);
670 if (!local->hw_scan_req)
671 return -ENOMEM;
672
673 local->hw_scan_req->req.ssids = req->ssids;
674 local->hw_scan_req->req.n_ssids = req->n_ssids;
675 ies = (u8 *)local->hw_scan_req +
676 sizeof(*local->hw_scan_req) +
677 req->n_channels * sizeof(req->channels[0]);
678 local->hw_scan_req->req.ie = ies;
679 local->hw_scan_req->req.flags = req->flags;
680 eth_broadcast_addr(local->hw_scan_req->req.bssid);
681 local->hw_scan_req->req.duration = req->duration;
682 local->hw_scan_req->req.duration_mandatory =
683 req->duration_mandatory;
684
685 local->hw_scan_band = 0;
686
687 /*
688 * After allocating local->hw_scan_req, we must
689 * go through until ieee80211_prep_hw_scan(), so
690 * anything that might be changed here and leave
691 * this function early must not go after this
692 * allocation.
693 */
694 }
695
696 rcu_assign_pointer(local->scan_req, req);
697 rcu_assign_pointer(local->scan_sdata, sdata);
698
699 if (req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR)
700 get_random_mask_addr(local->scan_addr,
701 req->mac_addr,
702 req->mac_addr_mask);
703 else
704 memcpy(local->scan_addr, sdata->vif.addr, ETH_ALEN);
705
706 if (hw_scan) {
707 __set_bit(SCAN_HW_SCANNING, &local->scanning);
708 } else if ((req->n_channels == 1) &&
709 (req->channels[0] == local->_oper_chandef.chan)) {
710 /*
711 * If we are scanning only on the operating channel
712 * then we do not need to stop normal activities
713 */
714 unsigned long next_delay;
715
716 __set_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
717
718 ieee80211_recalc_idle(local);
719
720 /* Notify driver scan is starting, keep order of operations
721 * same as normal software scan, in case that matters. */
722 drv_sw_scan_start(local, sdata, local->scan_addr);
723
724 ieee80211_configure_filter(local); /* accept probe-responses */
725
726 /* We need to ensure power level is at max for scanning. */
727 ieee80211_hw_config(local, 0);
728
729 if ((req->channels[0]->flags & (IEEE80211_CHAN_NO_IR |
730 IEEE80211_CHAN_RADAR)) ||
731 !req->n_ssids) {
732 next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
733 } else {
734 ieee80211_scan_state_send_probe(local, &next_delay);
735 next_delay = IEEE80211_CHANNEL_TIME;
736 }
737
738 /* Now, just wait a bit and we are all done! */
739 ieee80211_queue_delayed_work(&local->hw, &local->scan_work,
740 next_delay);
741 return 0;
742 } else {
743 /* Do normal software scan */
744 __set_bit(SCAN_SW_SCANNING, &local->scanning);
745 }
746
747 ieee80211_recalc_idle(local);
748
749 if (hw_scan) {
750 WARN_ON(!ieee80211_prep_hw_scan(local));
751 rc = drv_hw_scan(local, sdata, local->hw_scan_req);
752 } else {
753 rc = ieee80211_start_sw_scan(local, sdata);
754 }
755
756 if (rc) {
757 kfree(local->hw_scan_req);
758 local->hw_scan_req = NULL;
759 local->scanning = 0;
760
761 ieee80211_recalc_idle(local);
762
763 local->scan_req = NULL;
764 RCU_INIT_POINTER(local->scan_sdata, NULL);
765 }
766
767 if (hw_scan && rc == 1) {
768 /*
769 * we can't fall back to software for P2P-GO
770 * as it must update NoA etc.
771 */
772 if (ieee80211_vif_type_p2p(&sdata->vif) ==
773 NL80211_IFTYPE_P2P_GO)
774 return -EOPNOTSUPP;
775 hw_scan = false;
776 goto again;
777 }
778
779 return rc;
780 }
781
782 static unsigned long
783 ieee80211_scan_get_channel_time(struct ieee80211_channel *chan)
784 {
785 /*
786 * TODO: channel switching also consumes quite some time,
787 * add that delay as well to get a better estimation
788 */
789 if (chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR))
790 return IEEE80211_PASSIVE_CHANNEL_TIME;
791 return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME;
792 }
793
794 static void ieee80211_scan_state_decision(struct ieee80211_local *local,
795 unsigned long *next_delay)
796 {
797 bool associated = false;
798 bool tx_empty = true;
799 bool bad_latency;
800 struct ieee80211_sub_if_data *sdata;
801 struct ieee80211_channel *next_chan;
802 enum mac80211_scan_state next_scan_state;
803 struct cfg80211_scan_request *scan_req;
804
805 /*
806 * check if at least one STA interface is associated,
807 * check if at least one STA interface has pending tx frames
808 * and grab the lowest used beacon interval
809 */
810 mutex_lock(&local->iflist_mtx);
811 list_for_each_entry(sdata, &local->interfaces, list) {
812 if (!ieee80211_sdata_running(sdata))
813 continue;
814
815 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
816 if (sdata->u.mgd.associated) {
817 associated = true;
818
819 if (!qdisc_all_tx_empty(sdata->dev)) {
820 tx_empty = false;
821 break;
822 }
823 }
824 }
825 }
826 mutex_unlock(&local->iflist_mtx);
827
828 scan_req = rcu_dereference_protected(local->scan_req,
829 lockdep_is_held(&local->mtx));
830
831 next_chan = scan_req->channels[local->scan_channel_idx];
832
833 /*
834 * we're currently scanning a different channel, let's
835 * see if we can scan another channel without interfering
836 * with the current traffic situation.
837 *
838 * Keep good latency, do not stay off-channel more than 125 ms.
839 */
840
841 bad_latency = time_after(jiffies +
842 ieee80211_scan_get_channel_time(next_chan),
843 local->leave_oper_channel_time + HZ / 8);
844
845 if (associated && !tx_empty) {
846 if (scan_req->flags & NL80211_SCAN_FLAG_LOW_PRIORITY)
847 next_scan_state = SCAN_ABORT;
848 else
849 next_scan_state = SCAN_SUSPEND;
850 } else if (associated && bad_latency) {
851 next_scan_state = SCAN_SUSPEND;
852 } else {
853 next_scan_state = SCAN_SET_CHANNEL;
854 }
855
856 local->next_scan_state = next_scan_state;
857
858 *next_delay = 0;
859 }
860
861 static void ieee80211_scan_state_set_channel(struct ieee80211_local *local,
862 unsigned long *next_delay)
863 {
864 int skip;
865 struct ieee80211_channel *chan;
866 enum nl80211_bss_scan_width oper_scan_width;
867 struct cfg80211_scan_request *scan_req;
868
869 scan_req = rcu_dereference_protected(local->scan_req,
870 lockdep_is_held(&local->mtx));
871
872 skip = 0;
873 chan = scan_req->channels[local->scan_channel_idx];
874
875 local->scan_chandef.chan = chan;
876 local->scan_chandef.center_freq1 = chan->center_freq;
877 local->scan_chandef.center_freq2 = 0;
878 switch (scan_req->scan_width) {
879 case NL80211_BSS_CHAN_WIDTH_5:
880 local->scan_chandef.width = NL80211_CHAN_WIDTH_5;
881 break;
882 case NL80211_BSS_CHAN_WIDTH_10:
883 local->scan_chandef.width = NL80211_CHAN_WIDTH_10;
884 break;
885 case NL80211_BSS_CHAN_WIDTH_20:
886 /* If scanning on oper channel, use whatever channel-type
887 * is currently in use.
888 */
889 oper_scan_width = cfg80211_chandef_to_scan_width(
890 &local->_oper_chandef);
891 if (chan == local->_oper_chandef.chan &&
892 oper_scan_width == scan_req->scan_width)
893 local->scan_chandef = local->_oper_chandef;
894 else
895 local->scan_chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
896 break;
897 }
898
899 if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL))
900 skip = 1;
901
902 /* advance state machine to next channel/band */
903 local->scan_channel_idx++;
904
905 if (skip) {
906 /* if we skip this channel return to the decision state */
907 local->next_scan_state = SCAN_DECISION;
908 return;
909 }
910
911 /*
912 * Probe delay is used to update the NAV, cf. 11.1.3.2.2
913 * (which unfortunately doesn't say _why_ step a) is done,
914 * but it waits for the probe delay or until a frame is
915 * received - and the received frame would update the NAV).
916 * For now, we do not support waiting until a frame is
917 * received.
918 *
919 * In any case, it is not necessary for a passive scan.
920 */
921 if ((chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR)) ||
922 !scan_req->n_ssids) {
923 *next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
924 local->next_scan_state = SCAN_DECISION;
925 return;
926 }
927
928 /* active scan, send probes */
929 *next_delay = IEEE80211_PROBE_DELAY;
930 local->next_scan_state = SCAN_SEND_PROBE;
931 }
932
933 static void ieee80211_scan_state_suspend(struct ieee80211_local *local,
934 unsigned long *next_delay)
935 {
936 /* switch back to the operating channel */
937 local->scan_chandef.chan = NULL;
938 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
939
940 /* disable PS */
941 ieee80211_offchannel_return(local);
942
943 *next_delay = HZ / 5;
944 /* afterwards, resume scan & go to next channel */
945 local->next_scan_state = SCAN_RESUME;
946 }
947
948 static void ieee80211_scan_state_resume(struct ieee80211_local *local,
949 unsigned long *next_delay)
950 {
951 ieee80211_offchannel_stop_vifs(local);
952
953 if (local->ops->flush) {
954 ieee80211_flush_queues(local, NULL, false);
955 *next_delay = 0;
956 } else
957 *next_delay = HZ / 10;
958
959 /* remember when we left the operating channel */
960 local->leave_oper_channel_time = jiffies;
961
962 /* advance to the next channel to be scanned */
963 local->next_scan_state = SCAN_SET_CHANNEL;
964 }
965
966 void ieee80211_scan_work(struct work_struct *work)
967 {
968 struct ieee80211_local *local =
969 container_of(work, struct ieee80211_local, scan_work.work);
970 struct ieee80211_sub_if_data *sdata;
971 struct cfg80211_scan_request *scan_req;
972 unsigned long next_delay = 0;
973 bool aborted;
974
975 mutex_lock(&local->mtx);
976
977 if (!ieee80211_can_run_worker(local)) {
978 aborted = true;
979 goto out_complete;
980 }
981
982 sdata = rcu_dereference_protected(local->scan_sdata,
983 lockdep_is_held(&local->mtx));
984 scan_req = rcu_dereference_protected(local->scan_req,
985 lockdep_is_held(&local->mtx));
986
987 /* When scanning on-channel, the first-callback means completed. */
988 if (test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning)) {
989 aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning);
990 goto out_complete;
991 }
992
993 if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) {
994 aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning);
995 goto out_complete;
996 }
997
998 if (!sdata || !scan_req)
999 goto out;
1000
1001 if (!local->scanning) {
1002 int rc;
1003
1004 RCU_INIT_POINTER(local->scan_req, NULL);
1005 RCU_INIT_POINTER(local->scan_sdata, NULL);
1006
1007 rc = __ieee80211_start_scan(sdata, scan_req);
1008 if (rc) {
1009 /* need to complete scan in cfg80211 */
1010 rcu_assign_pointer(local->scan_req, scan_req);
1011 aborted = true;
1012 goto out_complete;
1013 } else
1014 goto out;
1015 }
1016
1017 /*
1018 * as long as no delay is required advance immediately
1019 * without scheduling a new work
1020 */
1021 do {
1022 if (!ieee80211_sdata_running(sdata)) {
1023 aborted = true;
1024 goto out_complete;
1025 }
1026
1027 switch (local->next_scan_state) {
1028 case SCAN_DECISION:
1029 /* if no more bands/channels left, complete scan */
1030 if (local->scan_channel_idx >= scan_req->n_channels) {
1031 aborted = false;
1032 goto out_complete;
1033 }
1034 ieee80211_scan_state_decision(local, &next_delay);
1035 break;
1036 case SCAN_SET_CHANNEL:
1037 ieee80211_scan_state_set_channel(local, &next_delay);
1038 break;
1039 case SCAN_SEND_PROBE:
1040 ieee80211_scan_state_send_probe(local, &next_delay);
1041 break;
1042 case SCAN_SUSPEND:
1043 ieee80211_scan_state_suspend(local, &next_delay);
1044 break;
1045 case SCAN_RESUME:
1046 ieee80211_scan_state_resume(local, &next_delay);
1047 break;
1048 case SCAN_ABORT:
1049 aborted = true;
1050 goto out_complete;
1051 }
1052 } while (next_delay == 0);
1053
1054 ieee80211_queue_delayed_work(&local->hw, &local->scan_work, next_delay);
1055 goto out;
1056
1057 out_complete:
1058 __ieee80211_scan_completed(&local->hw, aborted);
1059 out:
1060 mutex_unlock(&local->mtx);
1061 }
1062
1063 int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata,
1064 struct cfg80211_scan_request *req)
1065 {
1066 int res;
1067
1068 mutex_lock(&sdata->local->mtx);
1069 res = __ieee80211_start_scan(sdata, req);
1070 mutex_unlock(&sdata->local->mtx);
1071
1072 return res;
1073 }
1074
1075 int ieee80211_request_ibss_scan(struct ieee80211_sub_if_data *sdata,
1076 const u8 *ssid, u8 ssid_len,
1077 struct ieee80211_channel **channels,
1078 unsigned int n_channels,
1079 enum nl80211_bss_scan_width scan_width)
1080 {
1081 struct ieee80211_local *local = sdata->local;
1082 int ret = -EBUSY, i, n_ch = 0;
1083 enum nl80211_band band;
1084
1085 mutex_lock(&local->mtx);
1086
1087 /* busy scanning */
1088 if (local->scan_req)
1089 goto unlock;
1090
1091 /* fill internal scan request */
1092 if (!channels) {
1093 int max_n;
1094
1095 for (band = 0; band < NUM_NL80211_BANDS; band++) {
1096 if (!local->hw.wiphy->bands[band])
1097 continue;
1098
1099 max_n = local->hw.wiphy->bands[band]->n_channels;
1100 for (i = 0; i < max_n; i++) {
1101 struct ieee80211_channel *tmp_ch =
1102 &local->hw.wiphy->bands[band]->channels[i];
1103
1104 if (tmp_ch->flags & (IEEE80211_CHAN_NO_IR |
1105 IEEE80211_CHAN_DISABLED))
1106 continue;
1107
1108 local->int_scan_req->channels[n_ch] = tmp_ch;
1109 n_ch++;
1110 }
1111 }
1112
1113 if (WARN_ON_ONCE(n_ch == 0))
1114 goto unlock;
1115
1116 local->int_scan_req->n_channels = n_ch;
1117 } else {
1118 for (i = 0; i < n_channels; i++) {
1119 if (channels[i]->flags & (IEEE80211_CHAN_NO_IR |
1120 IEEE80211_CHAN_DISABLED))
1121 continue;
1122
1123 local->int_scan_req->channels[n_ch] = channels[i];
1124 n_ch++;
1125 }
1126
1127 if (WARN_ON_ONCE(n_ch == 0))
1128 goto unlock;
1129
1130 local->int_scan_req->n_channels = n_ch;
1131 }
1132
1133 local->int_scan_req->ssids = &local->scan_ssid;
1134 local->int_scan_req->n_ssids = 1;
1135 local->int_scan_req->scan_width = scan_width;
1136 memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN);
1137 local->int_scan_req->ssids[0].ssid_len = ssid_len;
1138
1139 ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req);
1140 unlock:
1141 mutex_unlock(&local->mtx);
1142 return ret;
1143 }
1144
1145 /*
1146 * Only call this function when a scan can't be queued -- under RTNL.
1147 */
1148 void ieee80211_scan_cancel(struct ieee80211_local *local)
1149 {
1150 /*
1151 * We are canceling software scan, or deferred scan that was not
1152 * yet really started (see __ieee80211_start_scan ).
1153 *
1154 * Regarding hardware scan:
1155 * - we can not call __ieee80211_scan_completed() as when
1156 * SCAN_HW_SCANNING bit is set this function change
1157 * local->hw_scan_req to operate on 5G band, what race with
1158 * driver which can use local->hw_scan_req
1159 *
1160 * - we can not cancel scan_work since driver can schedule it
1161 * by ieee80211_scan_completed(..., true) to finish scan
1162 *
1163 * Hence we only call the cancel_hw_scan() callback, but the low-level
1164 * driver is still responsible for calling ieee80211_scan_completed()
1165 * after the scan was completed/aborted.
1166 */
1167
1168 mutex_lock(&local->mtx);
1169 if (!local->scan_req)
1170 goto out;
1171
1172 /*
1173 * We have a scan running and the driver already reported completion,
1174 * but the worker hasn't run yet or is stuck on the mutex - mark it as
1175 * cancelled.
1176 */
1177 if (test_bit(SCAN_HW_SCANNING, &local->scanning) &&
1178 test_bit(SCAN_COMPLETED, &local->scanning)) {
1179 set_bit(SCAN_HW_CANCELLED, &local->scanning);
1180 goto out;
1181 }
1182
1183 if (test_bit(SCAN_HW_SCANNING, &local->scanning)) {
1184 /*
1185 * Make sure that __ieee80211_scan_completed doesn't trigger a
1186 * scan on another band.
1187 */
1188 set_bit(SCAN_HW_CANCELLED, &local->scanning);
1189 if (local->ops->cancel_hw_scan)
1190 drv_cancel_hw_scan(local,
1191 rcu_dereference_protected(local->scan_sdata,
1192 lockdep_is_held(&local->mtx)));
1193 goto out;
1194 }
1195
1196 /*
1197 * If the work is currently running, it must be blocked on
1198 * the mutex, but we'll set scan_sdata = NULL and it'll
1199 * simply exit once it acquires the mutex.
1200 */
1201 cancel_delayed_work(&local->scan_work);
1202 /* and clean up */
1203 memset(&local->scan_info, 0, sizeof(local->scan_info));
1204 __ieee80211_scan_completed(&local->hw, true);
1205 out:
1206 mutex_unlock(&local->mtx);
1207 }
1208
1209 int __ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata,
1210 struct cfg80211_sched_scan_request *req)
1211 {
1212 struct ieee80211_local *local = sdata->local;
1213 struct ieee80211_scan_ies sched_scan_ies = {};
1214 struct cfg80211_chan_def chandef;
1215 int ret, i, iebufsz, num_bands = 0;
1216 u32 rate_masks[NUM_NL80211_BANDS] = {};
1217 u8 bands_used = 0;
1218 u8 *ie;
1219 u32 flags = 0;
1220
1221 iebufsz = local->scan_ies_len + req->ie_len;
1222
1223 lockdep_assert_held(&local->mtx);
1224
1225 if (!local->ops->sched_scan_start)
1226 return -ENOTSUPP;
1227
1228 for (i = 0; i < NUM_NL80211_BANDS; i++) {
1229 if (local->hw.wiphy->bands[i]) {
1230 bands_used |= BIT(i);
1231 rate_masks[i] = (u32) -1;
1232 num_bands++;
1233 }
1234 }
1235
1236 if (req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT)
1237 flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT;
1238
1239 ie = kcalloc(iebufsz, num_bands, GFP_KERNEL);
1240 if (!ie) {
1241 ret = -ENOMEM;
1242 goto out;
1243 }
1244
1245 ieee80211_prepare_scan_chandef(&chandef, req->scan_width);
1246
1247 ieee80211_build_preq_ies(local, ie, num_bands * iebufsz,
1248 &sched_scan_ies, req->ie,
1249 req->ie_len, bands_used, rate_masks, &chandef,
1250 flags);
1251
1252 ret = drv_sched_scan_start(local, sdata, req, &sched_scan_ies);
1253 if (ret == 0) {
1254 rcu_assign_pointer(local->sched_scan_sdata, sdata);
1255 rcu_assign_pointer(local->sched_scan_req, req);
1256 }
1257
1258 kfree(ie);
1259
1260 out:
1261 if (ret) {
1262 /* Clean in case of failure after HW restart or upon resume. */
1263 RCU_INIT_POINTER(local->sched_scan_sdata, NULL);
1264 RCU_INIT_POINTER(local->sched_scan_req, NULL);
1265 }
1266
1267 return ret;
1268 }
1269
1270 int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata,
1271 struct cfg80211_sched_scan_request *req)
1272 {
1273 struct ieee80211_local *local = sdata->local;
1274 int ret;
1275
1276 mutex_lock(&local->mtx);
1277
1278 if (rcu_access_pointer(local->sched_scan_sdata)) {
1279 mutex_unlock(&local->mtx);
1280 return -EBUSY;
1281 }
1282
1283 ret = __ieee80211_request_sched_scan_start(sdata, req);
1284
1285 mutex_unlock(&local->mtx);
1286 return ret;
1287 }
1288
1289 int ieee80211_request_sched_scan_stop(struct ieee80211_local *local)
1290 {
1291 struct ieee80211_sub_if_data *sched_scan_sdata;
1292 int ret = -ENOENT;
1293
1294 mutex_lock(&local->mtx);
1295
1296 if (!local->ops->sched_scan_stop) {
1297 ret = -ENOTSUPP;
1298 goto out;
1299 }
1300
1301 /* We don't want to restart sched scan anymore. */
1302 RCU_INIT_POINTER(local->sched_scan_req, NULL);
1303
1304 sched_scan_sdata = rcu_dereference_protected(local->sched_scan_sdata,
1305 lockdep_is_held(&local->mtx));
1306 if (sched_scan_sdata) {
1307 ret = drv_sched_scan_stop(local, sched_scan_sdata);
1308 if (!ret)
1309 RCU_INIT_POINTER(local->sched_scan_sdata, NULL);
1310 }
1311 out:
1312 mutex_unlock(&local->mtx);
1313
1314 return ret;
1315 }
1316
1317 void ieee80211_sched_scan_results(struct ieee80211_hw *hw)
1318 {
1319 struct ieee80211_local *local = hw_to_local(hw);
1320
1321 trace_api_sched_scan_results(local);
1322
1323 cfg80211_sched_scan_results(hw->wiphy, 0);
1324 }
1325 EXPORT_SYMBOL(ieee80211_sched_scan_results);
1326
1327 void ieee80211_sched_scan_end(struct ieee80211_local *local)
1328 {
1329 mutex_lock(&local->mtx);
1330
1331 if (!rcu_access_pointer(local->sched_scan_sdata)) {
1332 mutex_unlock(&local->mtx);
1333 return;
1334 }
1335
1336 RCU_INIT_POINTER(local->sched_scan_sdata, NULL);
1337
1338 /* If sched scan was aborted by the driver. */
1339 RCU_INIT_POINTER(local->sched_scan_req, NULL);
1340
1341 mutex_unlock(&local->mtx);
1342
1343 cfg80211_sched_scan_stopped(local->hw.wiphy, 0);
1344 }
1345
1346 void ieee80211_sched_scan_stopped_work(struct work_struct *work)
1347 {
1348 struct ieee80211_local *local =
1349 container_of(work, struct ieee80211_local,
1350 sched_scan_stopped_work);
1351
1352 ieee80211_sched_scan_end(local);
1353 }
1354
1355 void ieee80211_sched_scan_stopped(struct ieee80211_hw *hw)
1356 {
1357 struct ieee80211_local *local = hw_to_local(hw);
1358
1359 trace_api_sched_scan_stopped(local);
1360
1361 /*
1362 * this shouldn't really happen, so for simplicity
1363 * simply ignore it, and let mac80211 reconfigure
1364 * the sched scan later on.
1365 */
1366 if (local->in_reconfig)
1367 return;
1368
1369 schedule_work(&local->sched_scan_stopped_work);
1370 }
1371 EXPORT_SYMBOL(ieee80211_sched_scan_stopped);
Linux with added FPC-III support