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Linux 5.7.7
[linux/fpc-iii.git] / net / mac80211 / scan.c
blobfdac8192a5198886986e0a7e0f6d33e8e5f17156
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Scanning implementation
4 *
5 * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
6 * Copyright 2004, Instant802 Networks, Inc.
7 * Copyright 2005, Devicescape Software, Inc.
8 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
9 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
10 * Copyright 2013-2015 Intel Mobile Communications GmbH
11 * Copyright 2016-2017 Intel Deutschland GmbH
12 * Copyright (C) 2018-2019 Intel Corporation
13 */
14
15 #include <linux/if_arp.h>
16 #include <linux/etherdevice.h>
17 #include <linux/rtnetlink.h>
18 #include <net/sch_generic.h>
19 #include <linux/slab.h>
20 #include <linux/export.h>
21 #include <linux/random.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
32 void 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
41 static 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 /* no valid wmm information or parameter element found */
53 return false;
54
55 return qos_info & IEEE80211_WMM_IE_AP_QOSINFO_UAPSD;
56 }
57
58 static void
59 ieee80211_update_bss_from_elems(struct ieee80211_local *local,
60 struct ieee80211_bss *bss,
61 struct ieee802_11_elems *elems,
62 struct ieee80211_rx_status *rx_status,
63 bool beacon)
64 {
65 int clen, srlen;
66
67 if (beacon)
68 bss->device_ts_beacon = rx_status->device_timestamp;
69 else
70 bss->device_ts_presp = rx_status->device_timestamp;
71
72 if (elems->parse_error) {
73 if (beacon)
74 bss->corrupt_data |= IEEE80211_BSS_CORRUPT_BEACON;
75 else
76 bss->corrupt_data |= IEEE80211_BSS_CORRUPT_PROBE_RESP;
77 } else {
78 if (beacon)
79 bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_BEACON;
80 else
81 bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_PROBE_RESP;
82 }
83
84 /* save the ERP value so that it is available at association time */
85 if (elems->erp_info && (!elems->parse_error ||
86 !(bss->valid_data & IEEE80211_BSS_VALID_ERP))) {
87 bss->erp_value = elems->erp_info[0];
88 bss->has_erp_value = true;
89 if (!elems->parse_error)
90 bss->valid_data |= IEEE80211_BSS_VALID_ERP;
91 }
92
93 /* replace old supported rates if we get new values */
94 if (!elems->parse_error ||
95 !(bss->valid_data & IEEE80211_BSS_VALID_RATES)) {
96 srlen = 0;
97 if (elems->supp_rates) {
98 clen = IEEE80211_MAX_SUPP_RATES;
99 if (clen > elems->supp_rates_len)
100 clen = elems->supp_rates_len;
101 memcpy(bss->supp_rates, elems->supp_rates, clen);
102 srlen += clen;
103 }
104 if (elems->ext_supp_rates) {
105 clen = IEEE80211_MAX_SUPP_RATES - srlen;
106 if (clen > elems->ext_supp_rates_len)
107 clen = elems->ext_supp_rates_len;
108 memcpy(bss->supp_rates + srlen, elems->ext_supp_rates,
109 clen);
110 srlen += clen;
111 }
112 if (srlen) {
113 bss->supp_rates_len = srlen;
114 if (!elems->parse_error)
115 bss->valid_data |= IEEE80211_BSS_VALID_RATES;
116 }
117 }
118
119 if (!elems->parse_error ||
120 !(bss->valid_data & IEEE80211_BSS_VALID_WMM)) {
121 bss->wmm_used = elems->wmm_param || elems->wmm_info;
122 bss->uapsd_supported = is_uapsd_supported(elems);
123 if (!elems->parse_error)
124 bss->valid_data |= IEEE80211_BSS_VALID_WMM;
125 }
126
127 if (beacon) {
128 struct ieee80211_supported_band *sband =
129 local->hw.wiphy->bands[rx_status->band];
130 if (!(rx_status->encoding == RX_ENC_HT) &&
131 !(rx_status->encoding == RX_ENC_VHT))
132 bss->beacon_rate =
133 &sband->bitrates[rx_status->rate_idx];
134 }
135 }
136
137 struct ieee80211_bss *
138 ieee80211_bss_info_update(struct ieee80211_local *local,
139 struct ieee80211_rx_status *rx_status,
140 struct ieee80211_mgmt *mgmt, size_t len,
141 struct ieee80211_channel *channel)
142 {
143 bool beacon = ieee80211_is_beacon(mgmt->frame_control);
144 struct cfg80211_bss *cbss, *non_tx_cbss;
145 struct ieee80211_bss *bss, *non_tx_bss;
146 struct cfg80211_inform_bss bss_meta = {
147 .boottime_ns = rx_status->boottime_ns,
148 };
149 bool signal_valid;
150 struct ieee80211_sub_if_data *scan_sdata;
151 struct ieee802_11_elems elems;
152 size_t baselen;
153 u8 *elements;
154
155 if (rx_status->flag & RX_FLAG_NO_SIGNAL_VAL)
156 bss_meta.signal = 0; /* invalid signal indication */
157 else if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
158 bss_meta.signal = rx_status->signal * 100;
159 else if (ieee80211_hw_check(&local->hw, SIGNAL_UNSPEC))
160 bss_meta.signal = (rx_status->signal * 100) / local->hw.max_signal;
161
162 bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_20;
163 if (rx_status->bw == RATE_INFO_BW_5)
164 bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_5;
165 else if (rx_status->bw == RATE_INFO_BW_10)
166 bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_10;
167
168 bss_meta.chan = channel;
169
170 rcu_read_lock();
171 scan_sdata = rcu_dereference(local->scan_sdata);
172 if (scan_sdata && scan_sdata->vif.type == NL80211_IFTYPE_STATION &&
173 scan_sdata->vif.bss_conf.assoc &&
174 ieee80211_have_rx_timestamp(rx_status)) {
175 bss_meta.parent_tsf =
176 ieee80211_calculate_rx_timestamp(local, rx_status,
177 len + FCS_LEN, 24);
178 ether_addr_copy(bss_meta.parent_bssid,
179 scan_sdata->vif.bss_conf.bssid);
180 }
181 rcu_read_unlock();
182
183 cbss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta,
184 mgmt, len, GFP_ATOMIC);
185 if (!cbss)
186 return NULL;
187
188 if (ieee80211_is_probe_resp(mgmt->frame_control)) {
189 elements = mgmt->u.probe_resp.variable;
190 baselen = offsetof(struct ieee80211_mgmt,
191 u.probe_resp.variable);
192 } else {
193 baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable);
194 elements = mgmt->u.beacon.variable;
195 }
196
197 if (baselen > len)
198 return NULL;
199
200 ieee802_11_parse_elems(elements, len - baselen, false, &elems,
201 mgmt->bssid, cbss->bssid);
202
203 /* In case the signal is invalid update the status */
204 signal_valid = channel == cbss->channel;
205 if (!signal_valid)
206 rx_status->flag |= RX_FLAG_NO_SIGNAL_VAL;
207
208 bss = (void *)cbss->priv;
209 ieee80211_update_bss_from_elems(local, bss, &elems, rx_status, beacon);
210
211 list_for_each_entry(non_tx_cbss, &cbss->nontrans_list, nontrans_list) {
212 non_tx_bss = (void *)non_tx_cbss->priv;
213
214 ieee80211_update_bss_from_elems(local, non_tx_bss, &elems,
215 rx_status, beacon);
216 }
217
218 return bss;
219 }
220
221 static bool ieee80211_scan_accept_presp(struct ieee80211_sub_if_data *sdata,
222 u32 scan_flags, const u8 *da)
223 {
224 if (!sdata)
225 return false;
226 /* accept broadcast for OCE */
227 if (scan_flags & NL80211_SCAN_FLAG_ACCEPT_BCAST_PROBE_RESP &&
228 is_broadcast_ether_addr(da))
229 return true;
230 if (scan_flags & NL80211_SCAN_FLAG_RANDOM_ADDR)
231 return true;
232 return ether_addr_equal(da, sdata->vif.addr);
233 }
234
235 void ieee80211_scan_rx(struct ieee80211_local *local, struct sk_buff *skb)
236 {
237 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
238 struct ieee80211_sub_if_data *sdata1, *sdata2;
239 struct ieee80211_mgmt *mgmt = (void *)skb->data;
240 struct ieee80211_bss *bss;
241 struct ieee80211_channel *channel;
242
243 if (skb->len < 24 ||
244 (!ieee80211_is_probe_resp(mgmt->frame_control) &&
245 !ieee80211_is_beacon(mgmt->frame_control)))
246 return;
247
248 sdata1 = rcu_dereference(local->scan_sdata);
249 sdata2 = rcu_dereference(local->sched_scan_sdata);
250
251 if (likely(!sdata1 && !sdata2))
252 return;
253
254 if (ieee80211_is_probe_resp(mgmt->frame_control)) {
255 struct cfg80211_scan_request *scan_req;
256 struct cfg80211_sched_scan_request *sched_scan_req;
257 u32 scan_req_flags = 0, sched_scan_req_flags = 0;
258
259 scan_req = rcu_dereference(local->scan_req);
260 sched_scan_req = rcu_dereference(local->sched_scan_req);
261
262 if (scan_req)
263 scan_req_flags = scan_req->flags;
264
265 if (sched_scan_req)
266 sched_scan_req_flags = sched_scan_req->flags;
267
268 /* ignore ProbeResp to foreign address or non-bcast (OCE)
269 * unless scanning with randomised address
270 */
271 if (!ieee80211_scan_accept_presp(sdata1, scan_req_flags,
272 mgmt->da) &&
273 !ieee80211_scan_accept_presp(sdata2, sched_scan_req_flags,
274 mgmt->da))
275 return;
276 }
277
278 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
279
280 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
281 return;
282
283 bss = ieee80211_bss_info_update(local, rx_status,
284 mgmt, skb->len,
285 channel);
286 if (bss)
287 ieee80211_rx_bss_put(local, bss);
288 }
289
290 static void
291 ieee80211_prepare_scan_chandef(struct cfg80211_chan_def *chandef,
292 enum nl80211_bss_scan_width scan_width)
293 {
294 memset(chandef, 0, sizeof(*chandef));
295 switch (scan_width) {
296 case NL80211_BSS_CHAN_WIDTH_5:
297 chandef->width = NL80211_CHAN_WIDTH_5;
298 break;
299 case NL80211_BSS_CHAN_WIDTH_10:
300 chandef->width = NL80211_CHAN_WIDTH_10;
301 break;
302 default:
303 chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
304 break;
305 }
306 }
307
308 /* return false if no more work */
309 static bool ieee80211_prep_hw_scan(struct ieee80211_local *local)
310 {
311 struct cfg80211_scan_request *req;
312 struct cfg80211_chan_def chandef;
313 u8 bands_used = 0;
314 int i, ielen, n_chans;
315 u32 flags = 0;
316
317 req = rcu_dereference_protected(local->scan_req,
318 lockdep_is_held(&local->mtx));
319
320 if (test_bit(SCAN_HW_CANCELLED, &local->scanning))
321 return false;
322
323 if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) {
324 for (i = 0; i < req->n_channels; i++) {
325 local->hw_scan_req->req.channels[i] = req->channels[i];
326 bands_used |= BIT(req->channels[i]->band);
327 }
328
329 n_chans = req->n_channels;
330 } else {
331 do {
332 if (local->hw_scan_band == NUM_NL80211_BANDS)
333 return false;
334
335 n_chans = 0;
336
337 for (i = 0; i < req->n_channels; i++) {
338 if (req->channels[i]->band !=
339 local->hw_scan_band)
340 continue;
341 local->hw_scan_req->req.channels[n_chans] =
342 req->channels[i];
343 n_chans++;
344 bands_used |= BIT(req->channels[i]->band);
345 }
346
347 local->hw_scan_band++;
348 } while (!n_chans);
349 }
350
351 local->hw_scan_req->req.n_channels = n_chans;
352 ieee80211_prepare_scan_chandef(&chandef, req->scan_width);
353
354 if (req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT)
355 flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT;
356
357 ielen = ieee80211_build_preq_ies(local,
358 (u8 *)local->hw_scan_req->req.ie,
359 local->hw_scan_ies_bufsize,
360 &local->hw_scan_req->ies,
361 req->ie, req->ie_len,
362 bands_used, req->rates, &chandef,
363 flags);
364 local->hw_scan_req->req.ie_len = ielen;
365 local->hw_scan_req->req.no_cck = req->no_cck;
366 ether_addr_copy(local->hw_scan_req->req.mac_addr, req->mac_addr);
367 ether_addr_copy(local->hw_scan_req->req.mac_addr_mask,
368 req->mac_addr_mask);
369 ether_addr_copy(local->hw_scan_req->req.bssid, req->bssid);
370
371 return true;
372 }
373
374 static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted)
375 {
376 struct ieee80211_local *local = hw_to_local(hw);
377 bool hw_scan = test_bit(SCAN_HW_SCANNING, &local->scanning);
378 bool was_scanning = local->scanning;
379 struct cfg80211_scan_request *scan_req;
380 struct ieee80211_sub_if_data *scan_sdata;
381 struct ieee80211_sub_if_data *sdata;
382
383 lockdep_assert_held(&local->mtx);
384
385 /*
386 * It's ok to abort a not-yet-running scan (that
387 * we have one at all will be verified by checking
388 * local->scan_req next), but not to complete it
389 * successfully.
390 */
391 if (WARN_ON(!local->scanning && !aborted))
392 aborted = true;
393
394 if (WARN_ON(!local->scan_req))
395 return;
396
397 if (hw_scan && !aborted &&
398 !ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS) &&
399 ieee80211_prep_hw_scan(local)) {
400 int rc;
401
402 rc = drv_hw_scan(local,
403 rcu_dereference_protected(local->scan_sdata,
404 lockdep_is_held(&local->mtx)),
405 local->hw_scan_req);
406
407 if (rc == 0)
408 return;
409
410 /* HW scan failed and is going to be reported as aborted,
411 * so clear old scan info.
412 */
413 memset(&local->scan_info, 0, sizeof(local->scan_info));
414 aborted = true;
415 }
416
417 kfree(local->hw_scan_req);
418 local->hw_scan_req = NULL;
419
420 scan_req = rcu_dereference_protected(local->scan_req,
421 lockdep_is_held(&local->mtx));
422
423 if (scan_req != local->int_scan_req) {
424 local->scan_info.aborted = aborted;
425 cfg80211_scan_done(scan_req, &local->scan_info);
426 }
427 RCU_INIT_POINTER(local->scan_req, NULL);
428
429 scan_sdata = rcu_dereference_protected(local->scan_sdata,
430 lockdep_is_held(&local->mtx));
431 RCU_INIT_POINTER(local->scan_sdata, NULL);
432
433 local->scanning = 0;
434 local->scan_chandef.chan = NULL;
435
436 /* Set power back to normal operating levels. */
437 ieee80211_hw_config(local, 0);
438
439 if (!hw_scan) {
440 ieee80211_configure_filter(local);
441 drv_sw_scan_complete(local, scan_sdata);
442 ieee80211_offchannel_return(local);
443 }
444
445 ieee80211_recalc_idle(local);
446
447 ieee80211_mlme_notify_scan_completed(local);
448 ieee80211_ibss_notify_scan_completed(local);
449
450 /* Requeue all the work that might have been ignored while
451 * the scan was in progress; if there was none this will
452 * just be a no-op for the particular interface.
453 */
454 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
455 if (ieee80211_sdata_running(sdata))
456 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
457 }
458
459 if (was_scanning)
460 ieee80211_start_next_roc(local);
461 }
462
463 void ieee80211_scan_completed(struct ieee80211_hw *hw,
464 struct cfg80211_scan_info *info)
465 {
466 struct ieee80211_local *local = hw_to_local(hw);
467
468 trace_api_scan_completed(local, info->aborted);
469
470 set_bit(SCAN_COMPLETED, &local->scanning);
471 if (info->aborted)
472 set_bit(SCAN_ABORTED, &local->scanning);
473
474 memcpy(&local->scan_info, info, sizeof(*info));
475
476 ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0);
477 }
478 EXPORT_SYMBOL(ieee80211_scan_completed);
479
480 static int ieee80211_start_sw_scan(struct ieee80211_local *local,
481 struct ieee80211_sub_if_data *sdata)
482 {
483 /* Software scan is not supported in multi-channel cases */
484 if (local->use_chanctx)
485 return -EOPNOTSUPP;
486
487 /*
488 * Hardware/driver doesn't support hw_scan, so use software
489 * scanning instead. First send a nullfunc frame with power save
490 * bit on so that AP will buffer the frames for us while we are not
491 * listening, then send probe requests to each channel and wait for
492 * the responses. After all channels are scanned, tune back to the
493 * original channel and send a nullfunc frame with power save bit
494 * off to trigger the AP to send us all the buffered frames.
495 *
496 * Note that while local->sw_scanning is true everything else but
497 * nullfunc frames and probe requests will be dropped in
498 * ieee80211_tx_h_check_assoc().
499 */
500 drv_sw_scan_start(local, sdata, local->scan_addr);
501
502 local->leave_oper_channel_time = jiffies;
503 local->next_scan_state = SCAN_DECISION;
504 local->scan_channel_idx = 0;
505
506 ieee80211_offchannel_stop_vifs(local);
507
508 /* ensure nullfunc is transmitted before leaving operating channel */
509 ieee80211_flush_queues(local, NULL, false);
510
511 ieee80211_configure_filter(local);
512
513 /* We need to set power level at maximum rate for scanning. */
514 ieee80211_hw_config(local, 0);
515
516 ieee80211_queue_delayed_work(&local->hw,
517 &local->scan_work, 0);
518
519 return 0;
520 }
521
522 static bool __ieee80211_can_leave_ch(struct ieee80211_sub_if_data *sdata)
523 {
524 struct ieee80211_local *local = sdata->local;
525 struct ieee80211_sub_if_data *sdata_iter;
526
527 if (!ieee80211_is_radar_required(local))
528 return true;
529
530 if (!regulatory_pre_cac_allowed(local->hw.wiphy))
531 return false;
532
533 mutex_lock(&local->iflist_mtx);
534 list_for_each_entry(sdata_iter, &local->interfaces, list) {
535 if (sdata_iter->wdev.cac_started) {
536 mutex_unlock(&local->iflist_mtx);
537 return false;
538 }
539 }
540 mutex_unlock(&local->iflist_mtx);
541
542 return true;
543 }
544
545 static bool ieee80211_can_scan(struct ieee80211_local *local,
546 struct ieee80211_sub_if_data *sdata)
547 {
548 if (!__ieee80211_can_leave_ch(sdata))
549 return false;
550
551 if (!list_empty(&local->roc_list))
552 return false;
553
554 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
555 sdata->u.mgd.flags & IEEE80211_STA_CONNECTION_POLL)
556 return false;
557
558 return true;
559 }
560
561 void ieee80211_run_deferred_scan(struct ieee80211_local *local)
562 {
563 lockdep_assert_held(&local->mtx);
564
565 if (!local->scan_req || local->scanning)
566 return;
567
568 if (!ieee80211_can_scan(local,
569 rcu_dereference_protected(
570 local->scan_sdata,
571 lockdep_is_held(&local->mtx))))
572 return;
573
574 ieee80211_queue_delayed_work(&local->hw, &local->scan_work,
575 round_jiffies_relative(0));
576 }
577
578 static void ieee80211_send_scan_probe_req(struct ieee80211_sub_if_data *sdata,
579 const u8 *src, const u8 *dst,
580 const u8 *ssid, size_t ssid_len,
581 const u8 *ie, size_t ie_len,
582 u32 ratemask, u32 flags, u32 tx_flags,
583 struct ieee80211_channel *channel)
584 {
585 struct sk_buff *skb;
586 u32 txdata_flags = 0;
587
588 skb = ieee80211_build_probe_req(sdata, src, dst, ratemask, channel,
589 ssid, ssid_len,
590 ie, ie_len, flags);
591
592 if (skb) {
593 if (flags & IEEE80211_PROBE_FLAG_RANDOM_SN) {
594 struct ieee80211_hdr *hdr = (void *)skb->data;
595 u16 sn = get_random_u32();
596
597 txdata_flags |= IEEE80211_TX_NO_SEQNO;
598 hdr->seq_ctrl =
599 cpu_to_le16(IEEE80211_SN_TO_SEQ(sn));
600 }
601 IEEE80211_SKB_CB(skb)->flags |= tx_flags;
602 ieee80211_tx_skb_tid_band(sdata, skb, 7, channel->band,
603 txdata_flags);
604 }
605 }
606
607 static void ieee80211_scan_state_send_probe(struct ieee80211_local *local,
608 unsigned long *next_delay)
609 {
610 int i;
611 struct ieee80211_sub_if_data *sdata;
612 struct cfg80211_scan_request *scan_req;
613 enum nl80211_band band = local->hw.conf.chandef.chan->band;
614 u32 flags = 0, tx_flags;
615
616 scan_req = rcu_dereference_protected(local->scan_req,
617 lockdep_is_held(&local->mtx));
618
619 tx_flags = IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
620 if (scan_req->no_cck)
621 tx_flags |= IEEE80211_TX_CTL_NO_CCK_RATE;
622 if (scan_req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT)
623 flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT;
624 if (scan_req->flags & NL80211_SCAN_FLAG_RANDOM_SN)
625 flags |= IEEE80211_PROBE_FLAG_RANDOM_SN;
626
627 sdata = rcu_dereference_protected(local->scan_sdata,
628 lockdep_is_held(&local->mtx));
629
630 for (i = 0; i < scan_req->n_ssids; i++)
631 ieee80211_send_scan_probe_req(
632 sdata, local->scan_addr, scan_req->bssid,
633 scan_req->ssids[i].ssid, scan_req->ssids[i].ssid_len,
634 scan_req->ie, scan_req->ie_len,
635 scan_req->rates[band], flags,
636 tx_flags, local->hw.conf.chandef.chan);
637
638 /*
639 * After sending probe requests, wait for probe responses
640 * on the channel.
641 */
642 *next_delay = IEEE80211_CHANNEL_TIME;
643 local->next_scan_state = SCAN_DECISION;
644 }
645
646 static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata,
647 struct cfg80211_scan_request *req)
648 {
649 struct ieee80211_local *local = sdata->local;
650 bool hw_scan = local->ops->hw_scan;
651 int rc;
652
653 lockdep_assert_held(&local->mtx);
654
655 if (local->scan_req)
656 return -EBUSY;
657
658 if (!__ieee80211_can_leave_ch(sdata))
659 return -EBUSY;
660
661 if (!ieee80211_can_scan(local, sdata)) {
662 /* wait for the work to finish/time out */
663 rcu_assign_pointer(local->scan_req, req);
664 rcu_assign_pointer(local->scan_sdata, sdata);
665 return 0;
666 }
667
668 again:
669 if (hw_scan) {
670 u8 *ies;
671
672 local->hw_scan_ies_bufsize = local->scan_ies_len + req->ie_len;
673
674 if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) {
675 int i, n_bands = 0;
676 u8 bands_counted = 0;
677
678 for (i = 0; i < req->n_channels; i++) {
679 if (bands_counted & BIT(req->channels[i]->band))
680 continue;
681 bands_counted |= BIT(req->channels[i]->band);
682 n_bands++;
683 }
684
685 local->hw_scan_ies_bufsize *= n_bands;
686 }
687
688 local->hw_scan_req = kmalloc(
689 sizeof(*local->hw_scan_req) +
690 req->n_channels * sizeof(req->channels[0]) +
691 local->hw_scan_ies_bufsize, GFP_KERNEL);
692 if (!local->hw_scan_req)
693 return -ENOMEM;
694
695 local->hw_scan_req->req.ssids = req->ssids;
696 local->hw_scan_req->req.n_ssids = req->n_ssids;
697 ies = (u8 *)local->hw_scan_req +
698 sizeof(*local->hw_scan_req) +
699 req->n_channels * sizeof(req->channels[0]);
700 local->hw_scan_req->req.ie = ies;
701 local->hw_scan_req->req.flags = req->flags;
702 eth_broadcast_addr(local->hw_scan_req->req.bssid);
703 local->hw_scan_req->req.duration = req->duration;
704 local->hw_scan_req->req.duration_mandatory =
705 req->duration_mandatory;
706
707 local->hw_scan_band = 0;
708
709 /*
710 * After allocating local->hw_scan_req, we must
711 * go through until ieee80211_prep_hw_scan(), so
712 * anything that might be changed here and leave
713 * this function early must not go after this
714 * allocation.
715 */
716 }
717
718 rcu_assign_pointer(local->scan_req, req);
719 rcu_assign_pointer(local->scan_sdata, sdata);
720
721 if (req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR)
722 get_random_mask_addr(local->scan_addr,
723 req->mac_addr,
724 req->mac_addr_mask);
725 else
726 memcpy(local->scan_addr, sdata->vif.addr, ETH_ALEN);
727
728 if (hw_scan) {
729 __set_bit(SCAN_HW_SCANNING, &local->scanning);
730 } else if ((req->n_channels == 1) &&
731 (req->channels[0] == local->_oper_chandef.chan)) {
732 /*
733 * If we are scanning only on the operating channel
734 * then we do not need to stop normal activities
735 */
736 unsigned long next_delay;
737
738 __set_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
739
740 ieee80211_recalc_idle(local);
741
742 /* Notify driver scan is starting, keep order of operations
743 * same as normal software scan, in case that matters. */
744 drv_sw_scan_start(local, sdata, local->scan_addr);
745
746 ieee80211_configure_filter(local); /* accept probe-responses */
747
748 /* We need to ensure power level is at max for scanning. */
749 ieee80211_hw_config(local, 0);
750
751 if ((req->channels[0]->flags & (IEEE80211_CHAN_NO_IR |
752 IEEE80211_CHAN_RADAR)) ||
753 !req->n_ssids) {
754 next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
755 } else {
756 ieee80211_scan_state_send_probe(local, &next_delay);
757 next_delay = IEEE80211_CHANNEL_TIME;
758 }
759
760 /* Now, just wait a bit and we are all done! */
761 ieee80211_queue_delayed_work(&local->hw, &local->scan_work,
762 next_delay);
763 return 0;
764 } else {
765 /* Do normal software scan */
766 __set_bit(SCAN_SW_SCANNING, &local->scanning);
767 }
768
769 ieee80211_recalc_idle(local);
770
771 if (hw_scan) {
772 WARN_ON(!ieee80211_prep_hw_scan(local));
773 rc = drv_hw_scan(local, sdata, local->hw_scan_req);
774 } else {
775 rc = ieee80211_start_sw_scan(local, sdata);
776 }
777
778 if (rc) {
779 kfree(local->hw_scan_req);
780 local->hw_scan_req = NULL;
781 local->scanning = 0;
782
783 ieee80211_recalc_idle(local);
784
785 local->scan_req = NULL;
786 RCU_INIT_POINTER(local->scan_sdata, NULL);
787 }
788
789 if (hw_scan && rc == 1) {
790 /*
791 * we can't fall back to software for P2P-GO
792 * as it must update NoA etc.
793 */
794 if (ieee80211_vif_type_p2p(&sdata->vif) ==
795 NL80211_IFTYPE_P2P_GO)
796 return -EOPNOTSUPP;
797 hw_scan = false;
798 goto again;
799 }
800
801 return rc;
802 }
803
804 static unsigned long
805 ieee80211_scan_get_channel_time(struct ieee80211_channel *chan)
806 {
807 /*
808 * TODO: channel switching also consumes quite some time,
809 * add that delay as well to get a better estimation
810 */
811 if (chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR))
812 return IEEE80211_PASSIVE_CHANNEL_TIME;
813 return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME;
814 }
815
816 static void ieee80211_scan_state_decision(struct ieee80211_local *local,
817 unsigned long *next_delay)
818 {
819 bool associated = false;
820 bool tx_empty = true;
821 bool bad_latency;
822 struct ieee80211_sub_if_data *sdata;
823 struct ieee80211_channel *next_chan;
824 enum mac80211_scan_state next_scan_state;
825 struct cfg80211_scan_request *scan_req;
826
827 /*
828 * check if at least one STA interface is associated,
829 * check if at least one STA interface has pending tx frames
830 * and grab the lowest used beacon interval
831 */
832 mutex_lock(&local->iflist_mtx);
833 list_for_each_entry(sdata, &local->interfaces, list) {
834 if (!ieee80211_sdata_running(sdata))
835 continue;
836
837 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
838 if (sdata->u.mgd.associated) {
839 associated = true;
840
841 if (!qdisc_all_tx_empty(sdata->dev)) {
842 tx_empty = false;
843 break;
844 }
845 }
846 }
847 }
848 mutex_unlock(&local->iflist_mtx);
849
850 scan_req = rcu_dereference_protected(local->scan_req,
851 lockdep_is_held(&local->mtx));
852
853 next_chan = scan_req->channels[local->scan_channel_idx];
854
855 /*
856 * we're currently scanning a different channel, let's
857 * see if we can scan another channel without interfering
858 * with the current traffic situation.
859 *
860 * Keep good latency, do not stay off-channel more than 125 ms.
861 */
862
863 bad_latency = time_after(jiffies +
864 ieee80211_scan_get_channel_time(next_chan),
865 local->leave_oper_channel_time + HZ / 8);
866
867 if (associated && !tx_empty) {
868 if (scan_req->flags & NL80211_SCAN_FLAG_LOW_PRIORITY)
869 next_scan_state = SCAN_ABORT;
870 else
871 next_scan_state = SCAN_SUSPEND;
872 } else if (associated && bad_latency) {
873 next_scan_state = SCAN_SUSPEND;
874 } else {
875 next_scan_state = SCAN_SET_CHANNEL;
876 }
877
878 local->next_scan_state = next_scan_state;
879
880 *next_delay = 0;
881 }
882
883 static void ieee80211_scan_state_set_channel(struct ieee80211_local *local,
884 unsigned long *next_delay)
885 {
886 int skip;
887 struct ieee80211_channel *chan;
888 enum nl80211_bss_scan_width oper_scan_width;
889 struct cfg80211_scan_request *scan_req;
890
891 scan_req = rcu_dereference_protected(local->scan_req,
892 lockdep_is_held(&local->mtx));
893
894 skip = 0;
895 chan = scan_req->channels[local->scan_channel_idx];
896
897 local->scan_chandef.chan = chan;
898 local->scan_chandef.center_freq1 = chan->center_freq;
899 local->scan_chandef.center_freq2 = 0;
900 switch (scan_req->scan_width) {
901 case NL80211_BSS_CHAN_WIDTH_5:
902 local->scan_chandef.width = NL80211_CHAN_WIDTH_5;
903 break;
904 case NL80211_BSS_CHAN_WIDTH_10:
905 local->scan_chandef.width = NL80211_CHAN_WIDTH_10;
906 break;
907 case NL80211_BSS_CHAN_WIDTH_20:
908 /* If scanning on oper channel, use whatever channel-type
909 * is currently in use.
910 */
911 oper_scan_width = cfg80211_chandef_to_scan_width(
912 &local->_oper_chandef);
913 if (chan == local->_oper_chandef.chan &&
914 oper_scan_width == scan_req->scan_width)
915 local->scan_chandef = local->_oper_chandef;
916 else
917 local->scan_chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
918 break;
919 }
920
921 if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL))
922 skip = 1;
923
924 /* advance state machine to next channel/band */
925 local->scan_channel_idx++;
926
927 if (skip) {
928 /* if we skip this channel return to the decision state */
929 local->next_scan_state = SCAN_DECISION;
930 return;
931 }
932
933 /*
934 * Probe delay is used to update the NAV, cf. 11.1.3.2.2
935 * (which unfortunately doesn't say _why_ step a) is done,
936 * but it waits for the probe delay or until a frame is
937 * received - and the received frame would update the NAV).
938 * For now, we do not support waiting until a frame is
939 * received.
940 *
941 * In any case, it is not necessary for a passive scan.
942 */
943 if ((chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR)) ||
944 !scan_req->n_ssids) {
945 *next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
946 local->next_scan_state = SCAN_DECISION;
947 return;
948 }
949
950 /* active scan, send probes */
951 *next_delay = IEEE80211_PROBE_DELAY;
952 local->next_scan_state = SCAN_SEND_PROBE;
953 }
954
955 static void ieee80211_scan_state_suspend(struct ieee80211_local *local,
956 unsigned long *next_delay)
957 {
958 /* switch back to the operating channel */
959 local->scan_chandef.chan = NULL;
960 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
961
962 /* disable PS */
963 ieee80211_offchannel_return(local);
964
965 *next_delay = HZ / 5;
966 /* afterwards, resume scan & go to next channel */
967 local->next_scan_state = SCAN_RESUME;
968 }
969
970 static void ieee80211_scan_state_resume(struct ieee80211_local *local,
971 unsigned long *next_delay)
972 {
973 ieee80211_offchannel_stop_vifs(local);
974
975 if (local->ops->flush) {
976 ieee80211_flush_queues(local, NULL, false);
977 *next_delay = 0;
978 } else
979 *next_delay = HZ / 10;
980
981 /* remember when we left the operating channel */
982 local->leave_oper_channel_time = jiffies;
983
984 /* advance to the next channel to be scanned */
985 local->next_scan_state = SCAN_SET_CHANNEL;
986 }
987
988 void ieee80211_scan_work(struct work_struct *work)
989 {
990 struct ieee80211_local *local =
991 container_of(work, struct ieee80211_local, scan_work.work);
992 struct ieee80211_sub_if_data *sdata;
993 struct cfg80211_scan_request *scan_req;
994 unsigned long next_delay = 0;
995 bool aborted;
996
997 mutex_lock(&local->mtx);
998
999 if (!ieee80211_can_run_worker(local)) {
1000 aborted = true;
1001 goto out_complete;
1002 }
1003
1004 sdata = rcu_dereference_protected(local->scan_sdata,
1005 lockdep_is_held(&local->mtx));
1006 scan_req = rcu_dereference_protected(local->scan_req,
1007 lockdep_is_held(&local->mtx));
1008
1009 /* When scanning on-channel, the first-callback means completed. */
1010 if (test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning)) {
1011 aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning);
1012 goto out_complete;
1013 }
1014
1015 if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) {
1016 aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning);
1017 goto out_complete;
1018 }
1019
1020 if (!sdata || !scan_req)
1021 goto out;
1022
1023 if (!local->scanning) {
1024 int rc;
1025
1026 RCU_INIT_POINTER(local->scan_req, NULL);
1027 RCU_INIT_POINTER(local->scan_sdata, NULL);
1028
1029 rc = __ieee80211_start_scan(sdata, scan_req);
1030 if (rc) {
1031 /* need to complete scan in cfg80211 */
1032 rcu_assign_pointer(local->scan_req, scan_req);
1033 aborted = true;
1034 goto out_complete;
1035 } else
1036 goto out;
1037 }
1038
1039 /*
1040 * as long as no delay is required advance immediately
1041 * without scheduling a new work
1042 */
1043 do {
1044 if (!ieee80211_sdata_running(sdata)) {
1045 aborted = true;
1046 goto out_complete;
1047 }
1048
1049 switch (local->next_scan_state) {
1050 case SCAN_DECISION:
1051 /* if no more bands/channels left, complete scan */
1052 if (local->scan_channel_idx >= scan_req->n_channels) {
1053 aborted = false;
1054 goto out_complete;
1055 }
1056 ieee80211_scan_state_decision(local, &next_delay);
1057 break;
1058 case SCAN_SET_CHANNEL:
1059 ieee80211_scan_state_set_channel(local, &next_delay);
1060 break;
1061 case SCAN_SEND_PROBE:
1062 ieee80211_scan_state_send_probe(local, &next_delay);
1063 break;
1064 case SCAN_SUSPEND:
1065 ieee80211_scan_state_suspend(local, &next_delay);
1066 break;
1067 case SCAN_RESUME:
1068 ieee80211_scan_state_resume(local, &next_delay);
1069 break;
1070 case SCAN_ABORT:
1071 aborted = true;
1072 goto out_complete;
1073 }
1074 } while (next_delay == 0);
1075
1076 ieee80211_queue_delayed_work(&local->hw, &local->scan_work, next_delay);
1077 goto out;
1078
1079 out_complete:
1080 __ieee80211_scan_completed(&local->hw, aborted);
1081 out:
1082 mutex_unlock(&local->mtx);
1083 }
1084
1085 int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata,
1086 struct cfg80211_scan_request *req)
1087 {
1088 int res;
1089
1090 mutex_lock(&sdata->local->mtx);
1091 res = __ieee80211_start_scan(sdata, req);
1092 mutex_unlock(&sdata->local->mtx);
1093
1094 return res;
1095 }
1096
1097 int ieee80211_request_ibss_scan(struct ieee80211_sub_if_data *sdata,
1098 const u8 *ssid, u8 ssid_len,
1099 struct ieee80211_channel **channels,
1100 unsigned int n_channels,
1101 enum nl80211_bss_scan_width scan_width)
1102 {
1103 struct ieee80211_local *local = sdata->local;
1104 int ret = -EBUSY, i, n_ch = 0;
1105 enum nl80211_band band;
1106
1107 mutex_lock(&local->mtx);
1108
1109 /* busy scanning */
1110 if (local->scan_req)
1111 goto unlock;
1112
1113 /* fill internal scan request */
1114 if (!channels) {
1115 int max_n;
1116
1117 for (band = 0; band < NUM_NL80211_BANDS; band++) {
1118 if (!local->hw.wiphy->bands[band])
1119 continue;
1120
1121 max_n = local->hw.wiphy->bands[band]->n_channels;
1122 for (i = 0; i < max_n; i++) {
1123 struct ieee80211_channel *tmp_ch =
1124 &local->hw.wiphy->bands[band]->channels[i];
1125
1126 if (tmp_ch->flags & (IEEE80211_CHAN_NO_IR |
1127 IEEE80211_CHAN_DISABLED))
1128 continue;
1129
1130 local->int_scan_req->channels[n_ch] = tmp_ch;
1131 n_ch++;
1132 }
1133 }
1134
1135 if (WARN_ON_ONCE(n_ch == 0))
1136 goto unlock;
1137
1138 local->int_scan_req->n_channels = n_ch;
1139 } else {
1140 for (i = 0; i < n_channels; i++) {
1141 if (channels[i]->flags & (IEEE80211_CHAN_NO_IR |
1142 IEEE80211_CHAN_DISABLED))
1143 continue;
1144
1145 local->int_scan_req->channels[n_ch] = channels[i];
1146 n_ch++;
1147 }
1148
1149 if (WARN_ON_ONCE(n_ch == 0))
1150 goto unlock;
1151
1152 local->int_scan_req->n_channels = n_ch;
1153 }
1154
1155 local->int_scan_req->ssids = &local->scan_ssid;
1156 local->int_scan_req->n_ssids = 1;
1157 local->int_scan_req->scan_width = scan_width;
1158 memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN);
1159 local->int_scan_req->ssids[0].ssid_len = ssid_len;
1160
1161 ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req);
1162 unlock:
1163 mutex_unlock(&local->mtx);
1164 return ret;
1165 }
1166
1167 /*
1168 * Only call this function when a scan can't be queued -- under RTNL.
1169 */
1170 void ieee80211_scan_cancel(struct ieee80211_local *local)
1171 {
1172 /*
1173 * We are canceling software scan, or deferred scan that was not
1174 * yet really started (see __ieee80211_start_scan ).
1175 *
1176 * Regarding hardware scan:
1177 * - we can not call __ieee80211_scan_completed() as when
1178 * SCAN_HW_SCANNING bit is set this function change
1179 * local->hw_scan_req to operate on 5G band, what race with
1180 * driver which can use local->hw_scan_req
1181 *
1182 * - we can not cancel scan_work since driver can schedule it
1183 * by ieee80211_scan_completed(..., true) to finish scan
1184 *
1185 * Hence we only call the cancel_hw_scan() callback, but the low-level
1186 * driver is still responsible for calling ieee80211_scan_completed()
1187 * after the scan was completed/aborted.
1188 */
1189
1190 mutex_lock(&local->mtx);
1191 if (!local->scan_req)
1192 goto out;
1193
1194 /*
1195 * We have a scan running and the driver already reported completion,
1196 * but the worker hasn't run yet or is stuck on the mutex - mark it as
1197 * cancelled.
1198 */
1199 if (test_bit(SCAN_HW_SCANNING, &local->scanning) &&
1200 test_bit(SCAN_COMPLETED, &local->scanning)) {
1201 set_bit(SCAN_HW_CANCELLED, &local->scanning);
1202 goto out;
1203 }
1204
1205 if (test_bit(SCAN_HW_SCANNING, &local->scanning)) {
1206 /*
1207 * Make sure that __ieee80211_scan_completed doesn't trigger a
1208 * scan on another band.
1209 */
1210 set_bit(SCAN_HW_CANCELLED, &local->scanning);
1211 if (local->ops->cancel_hw_scan)
1212 drv_cancel_hw_scan(local,
1213 rcu_dereference_protected(local->scan_sdata,
1214 lockdep_is_held(&local->mtx)));
1215 goto out;
1216 }
1217
1218 /*
1219 * If the work is currently running, it must be blocked on
1220 * the mutex, but we'll set scan_sdata = NULL and it'll
1221 * simply exit once it acquires the mutex.
1222 */
1223 cancel_delayed_work(&local->scan_work);
1224 /* and clean up */
1225 memset(&local->scan_info, 0, sizeof(local->scan_info));
1226 __ieee80211_scan_completed(&local->hw, true);
1227 out:
1228 mutex_unlock(&local->mtx);
1229 }
1230
1231 int __ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata,
1232 struct cfg80211_sched_scan_request *req)
1233 {
1234 struct ieee80211_local *local = sdata->local;
1235 struct ieee80211_scan_ies sched_scan_ies = {};
1236 struct cfg80211_chan_def chandef;
1237 int ret, i, iebufsz, num_bands = 0;
1238 u32 rate_masks[NUM_NL80211_BANDS] = {};
1239 u8 bands_used = 0;
1240 u8 *ie;
1241 u32 flags = 0;
1242
1243 iebufsz = local->scan_ies_len + req->ie_len;
1244
1245 lockdep_assert_held(&local->mtx);
1246
1247 if (!local->ops->sched_scan_start)
1248 return -ENOTSUPP;
1249
1250 for (i = 0; i < NUM_NL80211_BANDS; i++) {
1251 if (local->hw.wiphy->bands[i]) {
1252 bands_used |= BIT(i);
1253 rate_masks[i] = (u32) -1;
1254 num_bands++;
1255 }
1256 }
1257
1258 if (req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT)
1259 flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT;
1260
1261 ie = kcalloc(iebufsz, num_bands, GFP_KERNEL);
1262 if (!ie) {
1263 ret = -ENOMEM;
1264 goto out;
1265 }
1266
1267 ieee80211_prepare_scan_chandef(&chandef, req->scan_width);
1268
1269 ieee80211_build_preq_ies(local, ie, num_bands * iebufsz,
1270 &sched_scan_ies, req->ie,
1271 req->ie_len, bands_used, rate_masks, &chandef,
1272 flags);
1273
1274 ret = drv_sched_scan_start(local, sdata, req, &sched_scan_ies);
1275 if (ret == 0) {
1276 rcu_assign_pointer(local->sched_scan_sdata, sdata);
1277 rcu_assign_pointer(local->sched_scan_req, req);
1278 }
1279
1280 kfree(ie);
1281
1282 out:
1283 if (ret) {
1284 /* Clean in case of failure after HW restart or upon resume. */
1285 RCU_INIT_POINTER(local->sched_scan_sdata, NULL);
1286 RCU_INIT_POINTER(local->sched_scan_req, NULL);
1287 }
1288
1289 return ret;
1290 }
1291
1292 int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata,
1293 struct cfg80211_sched_scan_request *req)
1294 {
1295 struct ieee80211_local *local = sdata->local;
1296 int ret;
1297
1298 mutex_lock(&local->mtx);
1299
1300 if (rcu_access_pointer(local->sched_scan_sdata)) {
1301 mutex_unlock(&local->mtx);
1302 return -EBUSY;
1303 }
1304
1305 ret = __ieee80211_request_sched_scan_start(sdata, req);
1306
1307 mutex_unlock(&local->mtx);
1308 return ret;
1309 }
1310
1311 int ieee80211_request_sched_scan_stop(struct ieee80211_local *local)
1312 {
1313 struct ieee80211_sub_if_data *sched_scan_sdata;
1314 int ret = -ENOENT;
1315
1316 mutex_lock(&local->mtx);
1317
1318 if (!local->ops->sched_scan_stop) {
1319 ret = -ENOTSUPP;
1320 goto out;
1321 }
1322
1323 /* We don't want to restart sched scan anymore. */
1324 RCU_INIT_POINTER(local->sched_scan_req, NULL);
1325
1326 sched_scan_sdata = rcu_dereference_protected(local->sched_scan_sdata,
1327 lockdep_is_held(&local->mtx));
1328 if (sched_scan_sdata) {
1329 ret = drv_sched_scan_stop(local, sched_scan_sdata);
1330 if (!ret)
1331 RCU_INIT_POINTER(local->sched_scan_sdata, NULL);
1332 }
1333 out:
1334 mutex_unlock(&local->mtx);
1335
1336 return ret;
1337 }
1338
1339 void ieee80211_sched_scan_results(struct ieee80211_hw *hw)
1340 {
1341 struct ieee80211_local *local = hw_to_local(hw);
1342
1343 trace_api_sched_scan_results(local);
1344
1345 cfg80211_sched_scan_results(hw->wiphy, 0);
1346 }
1347 EXPORT_SYMBOL(ieee80211_sched_scan_results);
1348
1349 void ieee80211_sched_scan_end(struct ieee80211_local *local)
1350 {
1351 mutex_lock(&local->mtx);
1352
1353 if (!rcu_access_pointer(local->sched_scan_sdata)) {
1354 mutex_unlock(&local->mtx);
1355 return;
1356 }
1357
1358 RCU_INIT_POINTER(local->sched_scan_sdata, NULL);
1359
1360 /* If sched scan was aborted by the driver. */
1361 RCU_INIT_POINTER(local->sched_scan_req, NULL);
1362
1363 mutex_unlock(&local->mtx);
1364
1365 cfg80211_sched_scan_stopped(local->hw.wiphy, 0);
1366 }
1367
1368 void ieee80211_sched_scan_stopped_work(struct work_struct *work)
1369 {
1370 struct ieee80211_local *local =
1371 container_of(work, struct ieee80211_local,
1372 sched_scan_stopped_work);
1373
1374 ieee80211_sched_scan_end(local);
1375 }
1376
1377 void ieee80211_sched_scan_stopped(struct ieee80211_hw *hw)
1378 {
1379 struct ieee80211_local *local = hw_to_local(hw);
1380
1381 trace_api_sched_scan_stopped(local);
1382
1383 /*
1384 * this shouldn't really happen, so for simplicity
1385 * simply ignore it, and let mac80211 reconfigure
1386 * the sched scan later on.
1387 */
1388 if (local->in_reconfig)
1389 return;
1390
1391 schedule_work(&local->sched_scan_stopped_work);
1392 }
1393 EXPORT_SYMBOL(ieee80211_sched_scan_stopped);
Linux with added FPC-III support