?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Merge tag 'v5.3-rc4' into next
[linux/fpc-iii.git] / net / mac80211 / scan.c
blobadf94ba1ed77a5c44ae8479541d03c63466c62ab
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 = abs(channel->center_freq - cbss->channel->center_freq)
205 <= local->hw.wiphy->max_adj_channel_rssi_comp;
206 if (!signal_valid)
207 rx_status->flag |= RX_FLAG_NO_SIGNAL_VAL;
208
209 bss = (void *)cbss->priv;
210 ieee80211_update_bss_from_elems(local, bss, &elems, rx_status, beacon);
211
212 list_for_each_entry(non_tx_cbss, &cbss->nontrans_list, nontrans_list) {
213 non_tx_bss = (void *)non_tx_cbss->priv;
214
215 ieee80211_update_bss_from_elems(local, non_tx_bss, &elems,
216 rx_status, beacon);
217 }
218
219 return bss;
220 }
221
222 static bool ieee80211_scan_accept_presp(struct ieee80211_sub_if_data *sdata,
223 u32 scan_flags, const u8 *da)
224 {
225 if (!sdata)
226 return false;
227 /* accept broadcast for OCE */
228 if (scan_flags & NL80211_SCAN_FLAG_ACCEPT_BCAST_PROBE_RESP &&
229 is_broadcast_ether_addr(da))
230 return true;
231 if (scan_flags & NL80211_SCAN_FLAG_RANDOM_ADDR)
232 return true;
233 return ether_addr_equal(da, sdata->vif.addr);
234 }
235
236 void ieee80211_scan_rx(struct ieee80211_local *local, struct sk_buff *skb)
237 {
238 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
239 struct ieee80211_sub_if_data *sdata1, *sdata2;
240 struct ieee80211_mgmt *mgmt = (void *)skb->data;
241 struct ieee80211_bss *bss;
242 struct ieee80211_channel *channel;
243
244 if (skb->len < 24 ||
245 (!ieee80211_is_probe_resp(mgmt->frame_control) &&
246 !ieee80211_is_beacon(mgmt->frame_control)))
247 return;
248
249 sdata1 = rcu_dereference(local->scan_sdata);
250 sdata2 = rcu_dereference(local->sched_scan_sdata);
251
252 if (likely(!sdata1 && !sdata2))
253 return;
254
255 if (ieee80211_is_probe_resp(mgmt->frame_control)) {
256 struct cfg80211_scan_request *scan_req;
257 struct cfg80211_sched_scan_request *sched_scan_req;
258 u32 scan_req_flags = 0, sched_scan_req_flags = 0;
259
260 scan_req = rcu_dereference(local->scan_req);
261 sched_scan_req = rcu_dereference(local->sched_scan_req);
262
263 if (scan_req)
264 scan_req_flags = scan_req->flags;
265
266 if (sched_scan_req)
267 sched_scan_req_flags = sched_scan_req->flags;
268
269 /* ignore ProbeResp to foreign address or non-bcast (OCE)
270 * unless scanning with randomised address
271 */
272 if (!ieee80211_scan_accept_presp(sdata1, scan_req_flags,
273 mgmt->da) &&
274 !ieee80211_scan_accept_presp(sdata2, sched_scan_req_flags,
275 mgmt->da))
276 return;
277 }
278
279 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
280
281 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
282 return;
283
284 bss = ieee80211_bss_info_update(local, rx_status,
285 mgmt, skb->len,
286 channel);
287 if (bss)
288 ieee80211_rx_bss_put(local, bss);
289 }
290
291 static void
292 ieee80211_prepare_scan_chandef(struct cfg80211_chan_def *chandef,
293 enum nl80211_bss_scan_width scan_width)
294 {
295 memset(chandef, 0, sizeof(*chandef));
296 switch (scan_width) {
297 case NL80211_BSS_CHAN_WIDTH_5:
298 chandef->width = NL80211_CHAN_WIDTH_5;
299 break;
300 case NL80211_BSS_CHAN_WIDTH_10:
301 chandef->width = NL80211_CHAN_WIDTH_10;
302 break;
303 default:
304 chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
305 break;
306 }
307 }
308
309 /* return false if no more work */
310 static bool ieee80211_prep_hw_scan(struct ieee80211_local *local)
311 {
312 struct cfg80211_scan_request *req;
313 struct cfg80211_chan_def chandef;
314 u8 bands_used = 0;
315 int i, ielen, n_chans;
316 u32 flags = 0;
317
318 req = rcu_dereference_protected(local->scan_req,
319 lockdep_is_held(&local->mtx));
320
321 if (test_bit(SCAN_HW_CANCELLED, &local->scanning))
322 return false;
323
324 if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) {
325 for (i = 0; i < req->n_channels; i++) {
326 local->hw_scan_req->req.channels[i] = req->channels[i];
327 bands_used |= BIT(req->channels[i]->band);
328 }
329
330 n_chans = req->n_channels;
331 } else {
332 do {
333 if (local->hw_scan_band == NUM_NL80211_BANDS)
334 return false;
335
336 n_chans = 0;
337
338 for (i = 0; i < req->n_channels; i++) {
339 if (req->channels[i]->band !=
340 local->hw_scan_band)
341 continue;
342 local->hw_scan_req->req.channels[n_chans] =
343 req->channels[i];
344 n_chans++;
345 bands_used |= BIT(req->channels[i]->band);
346 }
347
348 local->hw_scan_band++;
349 } while (!n_chans);
350 }
351
352 local->hw_scan_req->req.n_channels = n_chans;
353 ieee80211_prepare_scan_chandef(&chandef, req->scan_width);
354
355 if (req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT)
356 flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT;
357
358 ielen = ieee80211_build_preq_ies(local,
359 (u8 *)local->hw_scan_req->req.ie,
360 local->hw_scan_ies_bufsize,
361 &local->hw_scan_req->ies,
362 req->ie, req->ie_len,
363 bands_used, req->rates, &chandef,
364 flags);
365 local->hw_scan_req->req.ie_len = ielen;
366 local->hw_scan_req->req.no_cck = req->no_cck;
367 ether_addr_copy(local->hw_scan_req->req.mac_addr, req->mac_addr);
368 ether_addr_copy(local->hw_scan_req->req.mac_addr_mask,
369 req->mac_addr_mask);
370 ether_addr_copy(local->hw_scan_req->req.bssid, req->bssid);
371
372 return true;
373 }
374
375 static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted)
376 {
377 struct ieee80211_local *local = hw_to_local(hw);
378 bool hw_scan = test_bit(SCAN_HW_SCANNING, &local->scanning);
379 bool was_scanning = local->scanning;
380 struct cfg80211_scan_request *scan_req;
381 struct ieee80211_sub_if_data *scan_sdata;
382 struct ieee80211_sub_if_data *sdata;
383
384 lockdep_assert_held(&local->mtx);
385
386 /*
387 * It's ok to abort a not-yet-running scan (that
388 * we have one at all will be verified by checking
389 * local->scan_req next), but not to complete it
390 * successfully.
391 */
392 if (WARN_ON(!local->scanning && !aborted))
393 aborted = true;
394
395 if (WARN_ON(!local->scan_req))
396 return;
397
398 if (hw_scan && !aborted &&
399 !ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS) &&
400 ieee80211_prep_hw_scan(local)) {
401 int rc;
402
403 rc = drv_hw_scan(local,
404 rcu_dereference_protected(local->scan_sdata,
405 lockdep_is_held(&local->mtx)),
406 local->hw_scan_req);
407
408 if (rc == 0)
409 return;
410
411 /* HW scan failed and is going to be reported as aborted,
412 * so clear old scan info.
413 */
414 memset(&local->scan_info, 0, sizeof(local->scan_info));
415 aborted = true;
416 }
417
418 kfree(local->hw_scan_req);
419 local->hw_scan_req = NULL;
420
421 scan_req = rcu_dereference_protected(local->scan_req,
422 lockdep_is_held(&local->mtx));
423
424 if (scan_req != local->int_scan_req) {
425 local->scan_info.aborted = aborted;
426 cfg80211_scan_done(scan_req, &local->scan_info);
427 }
428 RCU_INIT_POINTER(local->scan_req, NULL);
429
430 scan_sdata = rcu_dereference_protected(local->scan_sdata,
431 lockdep_is_held(&local->mtx));
432 RCU_INIT_POINTER(local->scan_sdata, NULL);
433
434 local->scanning = 0;
435 local->scan_chandef.chan = NULL;
436
437 /* Set power back to normal operating levels. */
438 ieee80211_hw_config(local, 0);
439
440 if (!hw_scan) {
441 ieee80211_configure_filter(local);
442 drv_sw_scan_complete(local, scan_sdata);
443 ieee80211_offchannel_return(local);
444 }
445
446 ieee80211_recalc_idle(local);
447
448 ieee80211_mlme_notify_scan_completed(local);
449 ieee80211_ibss_notify_scan_completed(local);
450
451 /* Requeue all the work that might have been ignored while
452 * the scan was in progress; if there was none this will
453 * just be a no-op for the particular interface.
454 */
455 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
456 if (ieee80211_sdata_running(sdata))
457 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
458 }
459
460 if (was_scanning)
461 ieee80211_start_next_roc(local);
462 }
463
464 void ieee80211_scan_completed(struct ieee80211_hw *hw,
465 struct cfg80211_scan_info *info)
466 {
467 struct ieee80211_local *local = hw_to_local(hw);
468
469 trace_api_scan_completed(local, info->aborted);
470
471 set_bit(SCAN_COMPLETED, &local->scanning);
472 if (info->aborted)
473 set_bit(SCAN_ABORTED, &local->scanning);
474
475 memcpy(&local->scan_info, info, sizeof(*info));
476
477 ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0);
478 }
479 EXPORT_SYMBOL(ieee80211_scan_completed);
480
481 static int ieee80211_start_sw_scan(struct ieee80211_local *local,
482 struct ieee80211_sub_if_data *sdata)
483 {
484 /* Software scan is not supported in multi-channel cases */
485 if (local->use_chanctx)
486 return -EOPNOTSUPP;
487
488 /*
489 * Hardware/driver doesn't support hw_scan, so use software
490 * scanning instead. First send a nullfunc frame with power save
491 * bit on so that AP will buffer the frames for us while we are not
492 * listening, then send probe requests to each channel and wait for
493 * the responses. After all channels are scanned, tune back to the
494 * original channel and send a nullfunc frame with power save bit
495 * off to trigger the AP to send us all the buffered frames.
496 *
497 * Note that while local->sw_scanning is true everything else but
498 * nullfunc frames and probe requests will be dropped in
499 * ieee80211_tx_h_check_assoc().
500 */
501 drv_sw_scan_start(local, sdata, local->scan_addr);
502
503 local->leave_oper_channel_time = jiffies;
504 local->next_scan_state = SCAN_DECISION;
505 local->scan_channel_idx = 0;
506
507 ieee80211_offchannel_stop_vifs(local);
508
509 /* ensure nullfunc is transmitted before leaving operating channel */
510 ieee80211_flush_queues(local, NULL, false);
511
512 ieee80211_configure_filter(local);
513
514 /* We need to set power level at maximum rate for scanning. */
515 ieee80211_hw_config(local, 0);
516
517 ieee80211_queue_delayed_work(&local->hw,
518 &local->scan_work, 0);
519
520 return 0;
521 }
522
523 static bool ieee80211_can_scan(struct ieee80211_local *local,
524 struct ieee80211_sub_if_data *sdata)
525 {
526 if (ieee80211_is_radar_required(local))
527 return false;
528
529 if (!list_empty(&local->roc_list))
530 return false;
531
532 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
533 sdata->u.mgd.flags & IEEE80211_STA_CONNECTION_POLL)
534 return false;
535
536 return true;
537 }
538
539 void ieee80211_run_deferred_scan(struct ieee80211_local *local)
540 {
541 lockdep_assert_held(&local->mtx);
542
543 if (!local->scan_req || local->scanning)
544 return;
545
546 if (!ieee80211_can_scan(local,
547 rcu_dereference_protected(
548 local->scan_sdata,
549 lockdep_is_held(&local->mtx))))
550 return;
551
552 ieee80211_queue_delayed_work(&local->hw, &local->scan_work,
553 round_jiffies_relative(0));
554 }
555
556 static void ieee80211_send_scan_probe_req(struct ieee80211_sub_if_data *sdata,
557 const u8 *src, const u8 *dst,
558 const u8 *ssid, size_t ssid_len,
559 const u8 *ie, size_t ie_len,
560 u32 ratemask, u32 flags, u32 tx_flags,
561 struct ieee80211_channel *channel)
562 {
563 struct sk_buff *skb;
564 u32 txdata_flags = 0;
565
566 skb = ieee80211_build_probe_req(sdata, src, dst, ratemask, channel,
567 ssid, ssid_len,
568 ie, ie_len, flags);
569
570 if (skb) {
571 if (flags & IEEE80211_PROBE_FLAG_RANDOM_SN) {
572 struct ieee80211_hdr *hdr = (void *)skb->data;
573 u16 sn = get_random_u32();
574
575 txdata_flags |= IEEE80211_TX_NO_SEQNO;
576 hdr->seq_ctrl =
577 cpu_to_le16(IEEE80211_SN_TO_SEQ(sn));
578 }
579 IEEE80211_SKB_CB(skb)->flags |= tx_flags;
580 ieee80211_tx_skb_tid_band(sdata, skb, 7, channel->band,
581 txdata_flags);
582 }
583 }
584
585 static void ieee80211_scan_state_send_probe(struct ieee80211_local *local,
586 unsigned long *next_delay)
587 {
588 int i;
589 struct ieee80211_sub_if_data *sdata;
590 struct cfg80211_scan_request *scan_req;
591 enum nl80211_band band = local->hw.conf.chandef.chan->band;
592 u32 flags = 0, tx_flags;
593
594 scan_req = rcu_dereference_protected(local->scan_req,
595 lockdep_is_held(&local->mtx));
596
597 tx_flags = IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
598 if (scan_req->no_cck)
599 tx_flags |= IEEE80211_TX_CTL_NO_CCK_RATE;
600 if (scan_req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT)
601 flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT;
602 if (scan_req->flags & NL80211_SCAN_FLAG_RANDOM_SN)
603 flags |= IEEE80211_PROBE_FLAG_RANDOM_SN;
604
605 sdata = rcu_dereference_protected(local->scan_sdata,
606 lockdep_is_held(&local->mtx));
607
608 for (i = 0; i < scan_req->n_ssids; i++)
609 ieee80211_send_scan_probe_req(
610 sdata, local->scan_addr, scan_req->bssid,
611 scan_req->ssids[i].ssid, scan_req->ssids[i].ssid_len,
612 scan_req->ie, scan_req->ie_len,
613 scan_req->rates[band], flags,
614 tx_flags, local->hw.conf.chandef.chan);
615
616 /*
617 * After sending probe requests, wait for probe responses
618 * on the channel.
619 */
620 *next_delay = IEEE80211_CHANNEL_TIME;
621 local->next_scan_state = SCAN_DECISION;
622 }
623
624 static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata,
625 struct cfg80211_scan_request *req)
626 {
627 struct ieee80211_local *local = sdata->local;
628 bool hw_scan = local->ops->hw_scan;
629 int rc;
630
631 lockdep_assert_held(&local->mtx);
632
633 if (local->scan_req || ieee80211_is_radar_required(local))
634 return -EBUSY;
635
636 if (!ieee80211_can_scan(local, sdata)) {
637 /* wait for the work to finish/time out */
638 rcu_assign_pointer(local->scan_req, req);
639 rcu_assign_pointer(local->scan_sdata, sdata);
640 return 0;
641 }
642
643 again:
644 if (hw_scan) {
645 u8 *ies;
646
647 local->hw_scan_ies_bufsize = local->scan_ies_len + req->ie_len;
648
649 if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) {
650 int i, n_bands = 0;
651 u8 bands_counted = 0;
652
653 for (i = 0; i < req->n_channels; i++) {
654 if (bands_counted & BIT(req->channels[i]->band))
655 continue;
656 bands_counted |= BIT(req->channels[i]->band);
657 n_bands++;
658 }
659
660 local->hw_scan_ies_bufsize *= n_bands;
661 }
662
663 local->hw_scan_req = kmalloc(
664 sizeof(*local->hw_scan_req) +
665 req->n_channels * sizeof(req->channels[0]) +
666 local->hw_scan_ies_bufsize, GFP_KERNEL);
667 if (!local->hw_scan_req)
668 return -ENOMEM;
669
670 local->hw_scan_req->req.ssids = req->ssids;
671 local->hw_scan_req->req.n_ssids = req->n_ssids;
672 ies = (u8 *)local->hw_scan_req +
673 sizeof(*local->hw_scan_req) +
674 req->n_channels * sizeof(req->channels[0]);
675 local->hw_scan_req->req.ie = ies;
676 local->hw_scan_req->req.flags = req->flags;
677 eth_broadcast_addr(local->hw_scan_req->req.bssid);
678 local->hw_scan_req->req.duration = req->duration;
679 local->hw_scan_req->req.duration_mandatory =
680 req->duration_mandatory;
681
682 local->hw_scan_band = 0;
683
684 /*
685 * After allocating local->hw_scan_req, we must
686 * go through until ieee80211_prep_hw_scan(), so
687 * anything that might be changed here and leave
688 * this function early must not go after this
689 * allocation.
690 */
691 }
692
693 rcu_assign_pointer(local->scan_req, req);
694 rcu_assign_pointer(local->scan_sdata, sdata);
695
696 if (req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR)
697 get_random_mask_addr(local->scan_addr,
698 req->mac_addr,
699 req->mac_addr_mask);
700 else
701 memcpy(local->scan_addr, sdata->vif.addr, ETH_ALEN);
702
703 if (hw_scan) {
704 __set_bit(SCAN_HW_SCANNING, &local->scanning);
705 } else if ((req->n_channels == 1) &&
706 (req->channels[0] == local->_oper_chandef.chan)) {
707 /*
708 * If we are scanning only on the operating channel
709 * then we do not need to stop normal activities
710 */
711 unsigned long next_delay;
712
713 __set_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
714
715 ieee80211_recalc_idle(local);
716
717 /* Notify driver scan is starting, keep order of operations
718 * same as normal software scan, in case that matters. */
719 drv_sw_scan_start(local, sdata, local->scan_addr);
720
721 ieee80211_configure_filter(local); /* accept probe-responses */
722
723 /* We need to ensure power level is at max for scanning. */
724 ieee80211_hw_config(local, 0);
725
726 if ((req->channels[0]->flags & (IEEE80211_CHAN_NO_IR |
727 IEEE80211_CHAN_RADAR)) ||
728 !req->n_ssids) {
729 next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
730 } else {
731 ieee80211_scan_state_send_probe(local, &next_delay);
732 next_delay = IEEE80211_CHANNEL_TIME;
733 }
734
735 /* Now, just wait a bit and we are all done! */
736 ieee80211_queue_delayed_work(&local->hw, &local->scan_work,
737 next_delay);
738 return 0;
739 } else {
740 /* Do normal software scan */
741 __set_bit(SCAN_SW_SCANNING, &local->scanning);
742 }
743
744 ieee80211_recalc_idle(local);
745
746 if (hw_scan) {
747 WARN_ON(!ieee80211_prep_hw_scan(local));
748 rc = drv_hw_scan(local, sdata, local->hw_scan_req);
749 } else {
750 rc = ieee80211_start_sw_scan(local, sdata);
751 }
752
753 if (rc) {
754 kfree(local->hw_scan_req);
755 local->hw_scan_req = NULL;
756 local->scanning = 0;
757
758 ieee80211_recalc_idle(local);
759
760 local->scan_req = NULL;
761 RCU_INIT_POINTER(local->scan_sdata, NULL);
762 }
763
764 if (hw_scan && rc == 1) {
765 /*
766 * we can't fall back to software for P2P-GO
767 * as it must update NoA etc.
768 */
769 if (ieee80211_vif_type_p2p(&sdata->vif) ==
770 NL80211_IFTYPE_P2P_GO)
771 return -EOPNOTSUPP;
772 hw_scan = false;
773 goto again;
774 }
775
776 return rc;
777 }
778
779 static unsigned long
780 ieee80211_scan_get_channel_time(struct ieee80211_channel *chan)
781 {
782 /*
783 * TODO: channel switching also consumes quite some time,
784 * add that delay as well to get a better estimation
785 */
786 if (chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR))
787 return IEEE80211_PASSIVE_CHANNEL_TIME;
788 return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME;
789 }
790
791 static void ieee80211_scan_state_decision(struct ieee80211_local *local,
792 unsigned long *next_delay)
793 {
794 bool associated = false;
795 bool tx_empty = true;
796 bool bad_latency;
797 struct ieee80211_sub_if_data *sdata;
798 struct ieee80211_channel *next_chan;
799 enum mac80211_scan_state next_scan_state;
800 struct cfg80211_scan_request *scan_req;
801
802 /*
803 * check if at least one STA interface is associated,
804 * check if at least one STA interface has pending tx frames
805 * and grab the lowest used beacon interval
806 */
807 mutex_lock(&local->iflist_mtx);
808 list_for_each_entry(sdata, &local->interfaces, list) {
809 if (!ieee80211_sdata_running(sdata))
810 continue;
811
812 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
813 if (sdata->u.mgd.associated) {
814 associated = true;
815
816 if (!qdisc_all_tx_empty(sdata->dev)) {
817 tx_empty = false;
818 break;
819 }
820 }
821 }
822 }
823 mutex_unlock(&local->iflist_mtx);
824
825 scan_req = rcu_dereference_protected(local->scan_req,
826 lockdep_is_held(&local->mtx));
827
828 next_chan = scan_req->channels[local->scan_channel_idx];
829
830 /*
831 * we're currently scanning a different channel, let's
832 * see if we can scan another channel without interfering
833 * with the current traffic situation.
834 *
835 * Keep good latency, do not stay off-channel more than 125 ms.
836 */
837
838 bad_latency = time_after(jiffies +
839 ieee80211_scan_get_channel_time(next_chan),
840 local->leave_oper_channel_time + HZ / 8);
841
842 if (associated && !tx_empty) {
843 if (scan_req->flags & NL80211_SCAN_FLAG_LOW_PRIORITY)
844 next_scan_state = SCAN_ABORT;
845 else
846 next_scan_state = SCAN_SUSPEND;
847 } else if (associated && bad_latency) {
848 next_scan_state = SCAN_SUSPEND;
849 } else {
850 next_scan_state = SCAN_SET_CHANNEL;
851 }
852
853 local->next_scan_state = next_scan_state;
854
855 *next_delay = 0;
856 }
857
858 static void ieee80211_scan_state_set_channel(struct ieee80211_local *local,
859 unsigned long *next_delay)
860 {
861 int skip;
862 struct ieee80211_channel *chan;
863 enum nl80211_bss_scan_width oper_scan_width;
864 struct cfg80211_scan_request *scan_req;
865
866 scan_req = rcu_dereference_protected(local->scan_req,
867 lockdep_is_held(&local->mtx));
868
869 skip = 0;
870 chan = scan_req->channels[local->scan_channel_idx];
871
872 local->scan_chandef.chan = chan;
873 local->scan_chandef.center_freq1 = chan->center_freq;
874 local->scan_chandef.center_freq2 = 0;
875 switch (scan_req->scan_width) {
876 case NL80211_BSS_CHAN_WIDTH_5:
877 local->scan_chandef.width = NL80211_CHAN_WIDTH_5;
878 break;
879 case NL80211_BSS_CHAN_WIDTH_10:
880 local->scan_chandef.width = NL80211_CHAN_WIDTH_10;
881 break;
882 case NL80211_BSS_CHAN_WIDTH_20:
883 /* If scanning on oper channel, use whatever channel-type
884 * is currently in use.
885 */
886 oper_scan_width = cfg80211_chandef_to_scan_width(
887 &local->_oper_chandef);
888 if (chan == local->_oper_chandef.chan &&
889 oper_scan_width == scan_req->scan_width)
890 local->scan_chandef = local->_oper_chandef;
891 else
892 local->scan_chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
893 break;
894 }
895
896 if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL))
897 skip = 1;
898
899 /* advance state machine to next channel/band */
900 local->scan_channel_idx++;
901
902 if (skip) {
903 /* if we skip this channel return to the decision state */
904 local->next_scan_state = SCAN_DECISION;
905 return;
906 }
907
908 /*
909 * Probe delay is used to update the NAV, cf. 11.1.3.2.2
910 * (which unfortunately doesn't say _why_ step a) is done,
911 * but it waits for the probe delay or until a frame is
912 * received - and the received frame would update the NAV).
913 * For now, we do not support waiting until a frame is
914 * received.
915 *
916 * In any case, it is not necessary for a passive scan.
917 */
918 if ((chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR)) ||
919 !scan_req->n_ssids) {
920 *next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
921 local->next_scan_state = SCAN_DECISION;
922 return;
923 }
924
925 /* active scan, send probes */
926 *next_delay = IEEE80211_PROBE_DELAY;
927 local->next_scan_state = SCAN_SEND_PROBE;
928 }
929
930 static void ieee80211_scan_state_suspend(struct ieee80211_local *local,
931 unsigned long *next_delay)
932 {
933 /* switch back to the operating channel */
934 local->scan_chandef.chan = NULL;
935 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
936
937 /* disable PS */
938 ieee80211_offchannel_return(local);
939
940 *next_delay = HZ / 5;
941 /* afterwards, resume scan & go to next channel */
942 local->next_scan_state = SCAN_RESUME;
943 }
944
945 static void ieee80211_scan_state_resume(struct ieee80211_local *local,
946 unsigned long *next_delay)
947 {
948 ieee80211_offchannel_stop_vifs(local);
949
950 if (local->ops->flush) {
951 ieee80211_flush_queues(local, NULL, false);
952 *next_delay = 0;
953 } else
954 *next_delay = HZ / 10;
955
956 /* remember when we left the operating channel */
957 local->leave_oper_channel_time = jiffies;
958
959 /* advance to the next channel to be scanned */
960 local->next_scan_state = SCAN_SET_CHANNEL;
961 }
962
963 void ieee80211_scan_work(struct work_struct *work)
964 {
965 struct ieee80211_local *local =
966 container_of(work, struct ieee80211_local, scan_work.work);
967 struct ieee80211_sub_if_data *sdata;
968 struct cfg80211_scan_request *scan_req;
969 unsigned long next_delay = 0;
970 bool aborted;
971
972 mutex_lock(&local->mtx);
973
974 if (!ieee80211_can_run_worker(local)) {
975 aborted = true;
976 goto out_complete;
977 }
978
979 sdata = rcu_dereference_protected(local->scan_sdata,
980 lockdep_is_held(&local->mtx));
981 scan_req = rcu_dereference_protected(local->scan_req,
982 lockdep_is_held(&local->mtx));
983
984 /* When scanning on-channel, the first-callback means completed. */
985 if (test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning)) {
986 aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning);
987 goto out_complete;
988 }
989
990 if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) {
991 aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning);
992 goto out_complete;
993 }
994
995 if (!sdata || !scan_req)
996 goto out;
997
998 if (!local->scanning) {
999 int rc;
1000
1001 RCU_INIT_POINTER(local->scan_req, NULL);
1002 RCU_INIT_POINTER(local->scan_sdata, NULL);
1003
1004 rc = __ieee80211_start_scan(sdata, scan_req);
1005 if (rc) {
1006 /* need to complete scan in cfg80211 */
1007 rcu_assign_pointer(local->scan_req, scan_req);
1008 aborted = true;
1009 goto out_complete;
1010 } else
1011 goto out;
1012 }
1013
1014 /*
1015 * as long as no delay is required advance immediately
1016 * without scheduling a new work
1017 */
1018 do {
1019 if (!ieee80211_sdata_running(sdata)) {
1020 aborted = true;
1021 goto out_complete;
1022 }
1023
1024 switch (local->next_scan_state) {
1025 case SCAN_DECISION:
1026 /* if no more bands/channels left, complete scan */
1027 if (local->scan_channel_idx >= scan_req->n_channels) {
1028 aborted = false;
1029 goto out_complete;
1030 }
1031 ieee80211_scan_state_decision(local, &next_delay);
1032 break;
1033 case SCAN_SET_CHANNEL:
1034 ieee80211_scan_state_set_channel(local, &next_delay);
1035 break;
1036 case SCAN_SEND_PROBE:
1037 ieee80211_scan_state_send_probe(local, &next_delay);
1038 break;
1039 case SCAN_SUSPEND:
1040 ieee80211_scan_state_suspend(local, &next_delay);
1041 break;
1042 case SCAN_RESUME:
1043 ieee80211_scan_state_resume(local, &next_delay);
1044 break;
1045 case SCAN_ABORT:
1046 aborted = true;
1047 goto out_complete;
1048 }
1049 } while (next_delay == 0);
1050
1051 ieee80211_queue_delayed_work(&local->hw, &local->scan_work, next_delay);
1052 goto out;
1053
1054 out_complete:
1055 __ieee80211_scan_completed(&local->hw, aborted);
1056 out:
1057 mutex_unlock(&local->mtx);
1058 }
1059
1060 int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata,
1061 struct cfg80211_scan_request *req)
1062 {
1063 int res;
1064
1065 mutex_lock(&sdata->local->mtx);
1066 res = __ieee80211_start_scan(sdata, req);
1067 mutex_unlock(&sdata->local->mtx);
1068
1069 return res;
1070 }
1071
1072 int ieee80211_request_ibss_scan(struct ieee80211_sub_if_data *sdata,
1073 const u8 *ssid, u8 ssid_len,
1074 struct ieee80211_channel **channels,
1075 unsigned int n_channels,
1076 enum nl80211_bss_scan_width scan_width)
1077 {
1078 struct ieee80211_local *local = sdata->local;
1079 int ret = -EBUSY, i, n_ch = 0;
1080 enum nl80211_band band;
1081
1082 mutex_lock(&local->mtx);
1083
1084 /* busy scanning */
1085 if (local->scan_req)
1086 goto unlock;
1087
1088 /* fill internal scan request */
1089 if (!channels) {
1090 int max_n;
1091
1092 for (band = 0; band < NUM_NL80211_BANDS; band++) {
1093 if (!local->hw.wiphy->bands[band])
1094 continue;
1095
1096 max_n = local->hw.wiphy->bands[band]->n_channels;
1097 for (i = 0; i < max_n; i++) {
1098 struct ieee80211_channel *tmp_ch =
1099 &local->hw.wiphy->bands[band]->channels[i];
1100
1101 if (tmp_ch->flags & (IEEE80211_CHAN_NO_IR |
1102 IEEE80211_CHAN_DISABLED))
1103 continue;
1104
1105 local->int_scan_req->channels[n_ch] = tmp_ch;
1106 n_ch++;
1107 }
1108 }
1109
1110 if (WARN_ON_ONCE(n_ch == 0))
1111 goto unlock;
1112
1113 local->int_scan_req->n_channels = n_ch;
1114 } else {
1115 for (i = 0; i < n_channels; i++) {
1116 if (channels[i]->flags & (IEEE80211_CHAN_NO_IR |
1117 IEEE80211_CHAN_DISABLED))
1118 continue;
1119
1120 local->int_scan_req->channels[n_ch] = channels[i];
1121 n_ch++;
1122 }
1123
1124 if (WARN_ON_ONCE(n_ch == 0))
1125 goto unlock;
1126
1127 local->int_scan_req->n_channels = n_ch;
1128 }
1129
1130 local->int_scan_req->ssids = &local->scan_ssid;
1131 local->int_scan_req->n_ssids = 1;
1132 local->int_scan_req->scan_width = scan_width;
1133 memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN);
1134 local->int_scan_req->ssids[0].ssid_len = ssid_len;
1135
1136 ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req);
1137 unlock:
1138 mutex_unlock(&local->mtx);
1139 return ret;
1140 }
1141
1142 /*
1143 * Only call this function when a scan can't be queued -- under RTNL.
1144 */
1145 void ieee80211_scan_cancel(struct ieee80211_local *local)
1146 {
1147 /*
1148 * We are canceling software scan, or deferred scan that was not
1149 * yet really started (see __ieee80211_start_scan ).
1150 *
1151 * Regarding hardware scan:
1152 * - we can not call __ieee80211_scan_completed() as when
1153 * SCAN_HW_SCANNING bit is set this function change
1154 * local->hw_scan_req to operate on 5G band, what race with
1155 * driver which can use local->hw_scan_req
1156 *
1157 * - we can not cancel scan_work since driver can schedule it
1158 * by ieee80211_scan_completed(..., true) to finish scan
1159 *
1160 * Hence we only call the cancel_hw_scan() callback, but the low-level
1161 * driver is still responsible for calling ieee80211_scan_completed()
1162 * after the scan was completed/aborted.
1163 */
1164
1165 mutex_lock(&local->mtx);
1166 if (!local->scan_req)
1167 goto out;
1168
1169 /*
1170 * We have a scan running and the driver already reported completion,
1171 * but the worker hasn't run yet or is stuck on the mutex - mark it as
1172 * cancelled.
1173 */
1174 if (test_bit(SCAN_HW_SCANNING, &local->scanning) &&
1175 test_bit(SCAN_COMPLETED, &local->scanning)) {
1176 set_bit(SCAN_HW_CANCELLED, &local->scanning);
1177 goto out;
1178 }
1179
1180 if (test_bit(SCAN_HW_SCANNING, &local->scanning)) {
1181 /*
1182 * Make sure that __ieee80211_scan_completed doesn't trigger a
1183 * scan on another band.
1184 */
1185 set_bit(SCAN_HW_CANCELLED, &local->scanning);
1186 if (local->ops->cancel_hw_scan)
1187 drv_cancel_hw_scan(local,
1188 rcu_dereference_protected(local->scan_sdata,
1189 lockdep_is_held(&local->mtx)));
1190 goto out;
1191 }
1192
1193 /*
1194 * If the work is currently running, it must be blocked on
1195 * the mutex, but we'll set scan_sdata = NULL and it'll
1196 * simply exit once it acquires the mutex.
1197 */
1198 cancel_delayed_work(&local->scan_work);
1199 /* and clean up */
1200 memset(&local->scan_info, 0, sizeof(local->scan_info));
1201 __ieee80211_scan_completed(&local->hw, true);
1202 out:
1203 mutex_unlock(&local->mtx);
1204 }
1205
1206 int __ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata,
1207 struct cfg80211_sched_scan_request *req)
1208 {
1209 struct ieee80211_local *local = sdata->local;
1210 struct ieee80211_scan_ies sched_scan_ies = {};
1211 struct cfg80211_chan_def chandef;
1212 int ret, i, iebufsz, num_bands = 0;
1213 u32 rate_masks[NUM_NL80211_BANDS] = {};
1214 u8 bands_used = 0;
1215 u8 *ie;
1216 u32 flags = 0;
1217
1218 iebufsz = local->scan_ies_len + req->ie_len;
1219
1220 lockdep_assert_held(&local->mtx);
1221
1222 if (!local->ops->sched_scan_start)
1223 return -ENOTSUPP;
1224
1225 for (i = 0; i < NUM_NL80211_BANDS; i++) {
1226 if (local->hw.wiphy->bands[i]) {
1227 bands_used |= BIT(i);
1228 rate_masks[i] = (u32) -1;
1229 num_bands++;
1230 }
1231 }
1232
1233 if (req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT)
1234 flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT;
1235
1236 ie = kcalloc(iebufsz, num_bands, GFP_KERNEL);
1237 if (!ie) {
1238 ret = -ENOMEM;
1239 goto out;
1240 }
1241
1242 ieee80211_prepare_scan_chandef(&chandef, req->scan_width);
1243
1244 ieee80211_build_preq_ies(local, ie, num_bands * iebufsz,
1245 &sched_scan_ies, req->ie,
1246 req->ie_len, bands_used, rate_masks, &chandef,
1247 flags);
1248
1249 ret = drv_sched_scan_start(local, sdata, req, &sched_scan_ies);
1250 if (ret == 0) {
1251 rcu_assign_pointer(local->sched_scan_sdata, sdata);
1252 rcu_assign_pointer(local->sched_scan_req, req);
1253 }
1254
1255 kfree(ie);
1256
1257 out:
1258 if (ret) {
1259 /* Clean in case of failure after HW restart or upon resume. */
1260 RCU_INIT_POINTER(local->sched_scan_sdata, NULL);
1261 RCU_INIT_POINTER(local->sched_scan_req, NULL);
1262 }
1263
1264 return ret;
1265 }
1266
1267 int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata,
1268 struct cfg80211_sched_scan_request *req)
1269 {
1270 struct ieee80211_local *local = sdata->local;
1271 int ret;
1272
1273 mutex_lock(&local->mtx);
1274
1275 if (rcu_access_pointer(local->sched_scan_sdata)) {
1276 mutex_unlock(&local->mtx);
1277 return -EBUSY;
1278 }
1279
1280 ret = __ieee80211_request_sched_scan_start(sdata, req);
1281
1282 mutex_unlock(&local->mtx);
1283 return ret;
1284 }
1285
1286 int ieee80211_request_sched_scan_stop(struct ieee80211_local *local)
1287 {
1288 struct ieee80211_sub_if_data *sched_scan_sdata;
1289 int ret = -ENOENT;
1290
1291 mutex_lock(&local->mtx);
1292
1293 if (!local->ops->sched_scan_stop) {
1294 ret = -ENOTSUPP;
1295 goto out;
1296 }
1297
1298 /* We don't want to restart sched scan anymore. */
1299 RCU_INIT_POINTER(local->sched_scan_req, NULL);
1300
1301 sched_scan_sdata = rcu_dereference_protected(local->sched_scan_sdata,
1302 lockdep_is_held(&local->mtx));
1303 if (sched_scan_sdata) {
1304 ret = drv_sched_scan_stop(local, sched_scan_sdata);
1305 if (!ret)
1306 RCU_INIT_POINTER(local->sched_scan_sdata, NULL);
1307 }
1308 out:
1309 mutex_unlock(&local->mtx);
1310
1311 return ret;
1312 }
1313
1314 void ieee80211_sched_scan_results(struct ieee80211_hw *hw)
1315 {
1316 struct ieee80211_local *local = hw_to_local(hw);
1317
1318 trace_api_sched_scan_results(local);
1319
1320 cfg80211_sched_scan_results(hw->wiphy, 0);
1321 }
1322 EXPORT_SYMBOL(ieee80211_sched_scan_results);
1323
1324 void ieee80211_sched_scan_end(struct ieee80211_local *local)
1325 {
1326 mutex_lock(&local->mtx);
1327
1328 if (!rcu_access_pointer(local->sched_scan_sdata)) {
1329 mutex_unlock(&local->mtx);
1330 return;
1331 }
1332
1333 RCU_INIT_POINTER(local->sched_scan_sdata, NULL);
1334
1335 /* If sched scan was aborted by the driver. */
1336 RCU_INIT_POINTER(local->sched_scan_req, NULL);
1337
1338 mutex_unlock(&local->mtx);
1339
1340 cfg80211_sched_scan_stopped(local->hw.wiphy, 0);
1341 }
1342
1343 void ieee80211_sched_scan_stopped_work(struct work_struct *work)
1344 {
1345 struct ieee80211_local *local =
1346 container_of(work, struct ieee80211_local,
1347 sched_scan_stopped_work);
1348
1349 ieee80211_sched_scan_end(local);
1350 }
1351
1352 void ieee80211_sched_scan_stopped(struct ieee80211_hw *hw)
1353 {
1354 struct ieee80211_local *local = hw_to_local(hw);
1355
1356 trace_api_sched_scan_stopped(local);
1357
1358 /*
1359 * this shouldn't really happen, so for simplicity
1360 * simply ignore it, and let mac80211 reconfigure
1361 * the sched scan later on.
1362 */
1363 if (local->in_reconfig)
1364 return;
1365
1366 schedule_work(&local->sched_scan_stopped_work);
1367 }
1368 EXPORT_SYMBOL(ieee80211_sched_scan_stopped);
Linux with added FPC-III support