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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 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License version 2 as
14 * published by the Free Software Foundation.
15 */
16
17#include <linux/if_arp.h>
18#include <linux/etherdevice.h>
19#include <linux/rtnetlink.h>
20#include <net/sch_generic.h>
21#include <linux/slab.h>
22#include <linux/export.h>
23#include <net/mac80211.h>
24
25#include "ieee80211_i.h"
26#include "driver-ops.h"
27#include "mesh.h"
28
29#define IEEE80211_PROBE_DELAY (HZ / 33)
30#define IEEE80211_CHANNEL_TIME (HZ / 33)
31#define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 9)
32
33void ieee80211_rx_bss_put(struct ieee80211_local *local,
34 struct ieee80211_bss *bss)
35{
36 if (!bss)
37 return;
38 cfg80211_put_bss(local->hw.wiphy,
39 container_of((void *)bss, struct cfg80211_bss, priv));
40}
41
42static bool is_uapsd_supported(struct ieee802_11_elems *elems)
43{
44 u8 qos_info;
45
46 if (elems->wmm_info && elems->wmm_info_len == 7
47 && elems->wmm_info[5] == 1)
48 qos_info = elems->wmm_info[6];
49 else if (elems->wmm_param && elems->wmm_param_len == 24
50 && elems->wmm_param[5] == 1)
51 qos_info = elems->wmm_param[6];
52 else
53 /* no valid wmm information or parameter element found */
54 return false;
55
56 return qos_info & IEEE80211_WMM_IE_AP_QOSINFO_UAPSD;
57}
58
59struct ieee80211_bss *
60ieee80211_bss_info_update(struct ieee80211_local *local,
61 struct ieee80211_rx_status *rx_status,
62 struct ieee80211_mgmt *mgmt, size_t len,
63 struct ieee802_11_elems *elems,
64 struct ieee80211_channel *channel)
65{
66 bool beacon = ieee80211_is_beacon(mgmt->frame_control);
67 struct cfg80211_bss *cbss;
68 struct ieee80211_bss *bss;
69 int clen, srlen;
70 struct cfg80211_inform_bss bss_meta = {
71 .boottime_ns = rx_status->boottime_ns,
72 };
73 bool signal_valid;
74 struct ieee80211_sub_if_data *scan_sdata;
75
76 if (rx_status->flag & RX_FLAG_NO_SIGNAL_VAL)
77 bss_meta.signal = 0; /* invalid signal indication */
78 else if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
79 bss_meta.signal = rx_status->signal * 100;
80 else if (ieee80211_hw_check(&local->hw, SIGNAL_UNSPEC))
81 bss_meta.signal = (rx_status->signal * 100) / local->hw.max_signal;
82
83 bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_20;
84 if (rx_status->bw == RATE_INFO_BW_5)
85 bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_5;
86 else if (rx_status->bw == RATE_INFO_BW_10)
87 bss_meta.scan_width = NL80211_BSS_CHAN_WIDTH_10;
88
89 bss_meta.chan = channel;
90
91 rcu_read_lock();
92 scan_sdata = rcu_dereference(local->scan_sdata);
93 if (scan_sdata && scan_sdata->vif.type == NL80211_IFTYPE_STATION &&
94 scan_sdata->vif.bss_conf.assoc &&
95 ieee80211_have_rx_timestamp(rx_status)) {
96 bss_meta.parent_tsf =
97 ieee80211_calculate_rx_timestamp(local, rx_status,
98 len + FCS_LEN, 24);
99 ether_addr_copy(bss_meta.parent_bssid,
100 scan_sdata->vif.bss_conf.bssid);
101 }
102 rcu_read_unlock();
103
104 cbss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta,
105 mgmt, len, GFP_ATOMIC);
106 if (!cbss)
107 return NULL;
108 /* In case the signal is invalid update the status */
109 signal_valid = abs(channel->center_freq - cbss->channel->center_freq)
110 <= local->hw.wiphy->max_adj_channel_rssi_comp;
111 if (!signal_valid)
112 rx_status->flag |= RX_FLAG_NO_SIGNAL_VAL;
113
114 bss = (void *)cbss->priv;
115
116 if (beacon)
117 bss->device_ts_beacon = rx_status->device_timestamp;
118 else
119 bss->device_ts_presp = rx_status->device_timestamp;
120
121 if (elems->parse_error) {
122 if (beacon)
123 bss->corrupt_data |= IEEE80211_BSS_CORRUPT_BEACON;
124 else
125 bss->corrupt_data |= IEEE80211_BSS_CORRUPT_PROBE_RESP;
126 } else {
127 if (beacon)
128 bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_BEACON;
129 else
130 bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_PROBE_RESP;
131 }
132
133 /* save the ERP value so that it is available at association time */
134 if (elems->erp_info && (!elems->parse_error ||
135 !(bss->valid_data & IEEE80211_BSS_VALID_ERP))) {
136 bss->erp_value = elems->erp_info[0];
137 bss->has_erp_value = true;
138 if (!elems->parse_error)
139 bss->valid_data |= IEEE80211_BSS_VALID_ERP;
140 }
141
142 /* replace old supported rates if we get new values */
143 if (!elems->parse_error ||
144 !(bss->valid_data & IEEE80211_BSS_VALID_RATES)) {
145 srlen = 0;
146 if (elems->supp_rates) {
147 clen = IEEE80211_MAX_SUPP_RATES;
148 if (clen > elems->supp_rates_len)
149 clen = elems->supp_rates_len;
150 memcpy(bss->supp_rates, elems->supp_rates, clen);
151 srlen += clen;
152 }
153 if (elems->ext_supp_rates) {
154 clen = IEEE80211_MAX_SUPP_RATES - srlen;
155 if (clen > elems->ext_supp_rates_len)
156 clen = elems->ext_supp_rates_len;
157 memcpy(bss->supp_rates + srlen, elems->ext_supp_rates,
158 clen);
159 srlen += clen;
160 }
161 if (srlen) {
162 bss->supp_rates_len = srlen;
163 if (!elems->parse_error)
164 bss->valid_data |= IEEE80211_BSS_VALID_RATES;
165 }
166 }
167
168 if (!elems->parse_error ||
169 !(bss->valid_data & IEEE80211_BSS_VALID_WMM)) {
170 bss->wmm_used = elems->wmm_param || elems->wmm_info;
171 bss->uapsd_supported = is_uapsd_supported(elems);
172 if (!elems->parse_error)
173 bss->valid_data |= IEEE80211_BSS_VALID_WMM;
174 }
175
176 if (beacon) {
177 struct ieee80211_supported_band *sband =
178 local->hw.wiphy->bands[rx_status->band];
179 if (!(rx_status->encoding == RX_ENC_HT) &&
180 !(rx_status->encoding == RX_ENC_VHT))
181 bss->beacon_rate =
182 &sband->bitrates[rx_status->rate_idx];
183 }
184
185 return bss;
186}
187
188static bool ieee80211_scan_accept_presp(struct ieee80211_sub_if_data *sdata,
189 u32 scan_flags, const u8 *da)
190{
191 if (!sdata)
192 return false;
193 /* accept broadcast for OCE */
194 if (scan_flags & NL80211_SCAN_FLAG_ACCEPT_BCAST_PROBE_RESP &&
195 is_broadcast_ether_addr(da))
196 return true;
197 if (scan_flags & NL80211_SCAN_FLAG_RANDOM_ADDR)
198 return true;
199 return ether_addr_equal(da, sdata->vif.addr);
200}
201
202void ieee80211_scan_rx(struct ieee80211_local *local, struct sk_buff *skb)
203{
204 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
205 struct ieee80211_sub_if_data *sdata1, *sdata2;
206 struct ieee80211_mgmt *mgmt = (void *)skb->data;
207 struct ieee80211_bss *bss;
208 u8 *elements;
209 struct ieee80211_channel *channel;
210 size_t baselen;
211 struct ieee802_11_elems elems;
212
213 if (skb->len < 24 ||
214 (!ieee80211_is_probe_resp(mgmt->frame_control) &&
215 !ieee80211_is_beacon(mgmt->frame_control)))
216 return;
217
218 sdata1 = rcu_dereference(local->scan_sdata);
219 sdata2 = rcu_dereference(local->sched_scan_sdata);
220
221 if (likely(!sdata1 && !sdata2))
222 return;
223
224 if (ieee80211_is_probe_resp(mgmt->frame_control)) {
225 struct cfg80211_scan_request *scan_req;
226 struct cfg80211_sched_scan_request *sched_scan_req;
227 u32 scan_req_flags = 0, sched_scan_req_flags = 0;
228
229 scan_req = rcu_dereference(local->scan_req);
230 sched_scan_req = rcu_dereference(local->sched_scan_req);
231
232 if (scan_req)
233 scan_req_flags = scan_req->flags;
234
235 if (sched_scan_req)
236 sched_scan_req_flags = sched_scan_req->flags;
237
238 /* ignore ProbeResp to foreign address or non-bcast (OCE)
239 * unless scanning with randomised address
240 */
241 if (!ieee80211_scan_accept_presp(sdata1, scan_req_flags,
242 mgmt->da) &&
243 !ieee80211_scan_accept_presp(sdata2, sched_scan_req_flags,
244 mgmt->da))
245 return;
246
247 elements = mgmt->u.probe_resp.variable;
248 baselen = offsetof(struct ieee80211_mgmt, u.probe_resp.variable);
249 } else {
250 baselen = offsetof(struct ieee80211_mgmt, u.beacon.variable);
251 elements = mgmt->u.beacon.variable;
252 }
253
254 if (baselen > skb->len)
255 return;
256
257 ieee802_11_parse_elems(elements, skb->len - baselen, false, &elems);
258
259 channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
260
261 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
262 return;
263
264 bss = ieee80211_bss_info_update(local, rx_status,
265 mgmt, skb->len, &elems,
266 channel);
267 if (bss)
268 ieee80211_rx_bss_put(local, bss);
269}
270
271static void
272ieee80211_prepare_scan_chandef(struct cfg80211_chan_def *chandef,
273 enum nl80211_bss_scan_width scan_width)
274{
275 memset(chandef, 0, sizeof(*chandef));
276 switch (scan_width) {
277 case NL80211_BSS_CHAN_WIDTH_5:
278 chandef->width = NL80211_CHAN_WIDTH_5;
279 break;
280 case NL80211_BSS_CHAN_WIDTH_10:
281 chandef->width = NL80211_CHAN_WIDTH_10;
282 break;
283 default:
284 chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
285 break;
286 }
287}
288
289/* return false if no more work */
290static bool ieee80211_prep_hw_scan(struct ieee80211_local *local)
291{
292 struct cfg80211_scan_request *req;
293 struct cfg80211_chan_def chandef;
294 u8 bands_used = 0;
295 int i, ielen, n_chans;
296
297 req = rcu_dereference_protected(local->scan_req,
298 lockdep_is_held(&local->mtx));
299
300 if (test_bit(SCAN_HW_CANCELLED, &local->scanning))
301 return false;
302
303 if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) {
304 for (i = 0; i < req->n_channels; i++) {
305 local->hw_scan_req->req.channels[i] = req->channels[i];
306 bands_used |= BIT(req->channels[i]->band);
307 }
308
309 n_chans = req->n_channels;
310 } else {
311 do {
312 if (local->hw_scan_band == NUM_NL80211_BANDS)
313 return false;
314
315 n_chans = 0;
316
317 for (i = 0; i < req->n_channels; i++) {
318 if (req->channels[i]->band !=
319 local->hw_scan_band)
320 continue;
321 local->hw_scan_req->req.channels[n_chans] =
322 req->channels[i];
323 n_chans++;
324 bands_used |= BIT(req->channels[i]->band);
325 }
326
327 local->hw_scan_band++;
328 } while (!n_chans);
329 }
330
331 local->hw_scan_req->req.n_channels = n_chans;
332 ieee80211_prepare_scan_chandef(&chandef, req->scan_width);
333
334 ielen = ieee80211_build_preq_ies(local,
335 (u8 *)local->hw_scan_req->req.ie,
336 local->hw_scan_ies_bufsize,
337 &local->hw_scan_req->ies,
338 req->ie, req->ie_len,
339 bands_used, req->rates, &chandef);
340 local->hw_scan_req->req.ie_len = ielen;
341 local->hw_scan_req->req.no_cck = req->no_cck;
342 ether_addr_copy(local->hw_scan_req->req.mac_addr, req->mac_addr);
343 ether_addr_copy(local->hw_scan_req->req.mac_addr_mask,
344 req->mac_addr_mask);
345 ether_addr_copy(local->hw_scan_req->req.bssid, req->bssid);
346
347 return true;
348}
349
350static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted)
351{
352 struct ieee80211_local *local = hw_to_local(hw);
353 bool hw_scan = local->ops->hw_scan;
354 bool was_scanning = local->scanning;
355 struct cfg80211_scan_request *scan_req;
356 struct ieee80211_sub_if_data *scan_sdata;
357 struct ieee80211_sub_if_data *sdata;
358
359 lockdep_assert_held(&local->mtx);
360
361 /*
362 * It's ok to abort a not-yet-running scan (that
363 * we have one at all will be verified by checking
364 * local->scan_req next), but not to complete it
365 * successfully.
366 */
367 if (WARN_ON(!local->scanning && !aborted))
368 aborted = true;
369
370 if (WARN_ON(!local->scan_req))
371 return;
372
373 if (hw_scan && !aborted &&
374 !ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS) &&
375 ieee80211_prep_hw_scan(local)) {
376 int rc;
377
378 rc = drv_hw_scan(local,
379 rcu_dereference_protected(local->scan_sdata,
380 lockdep_is_held(&local->mtx)),
381 local->hw_scan_req);
382
383 if (rc == 0)
384 return;
385
386 /* HW scan failed and is going to be reported as aborted,
387 * so clear old scan info.
388 */
389 memset(&local->scan_info, 0, sizeof(local->scan_info));
390 aborted = true;
391 }
392
393 kfree(local->hw_scan_req);
394 local->hw_scan_req = NULL;
395
396 scan_req = rcu_dereference_protected(local->scan_req,
397 lockdep_is_held(&local->mtx));
398
399 if (scan_req != local->int_scan_req) {
400 local->scan_info.aborted = aborted;
401 cfg80211_scan_done(scan_req, &local->scan_info);
402 }
403 RCU_INIT_POINTER(local->scan_req, NULL);
404
405 scan_sdata = rcu_dereference_protected(local->scan_sdata,
406 lockdep_is_held(&local->mtx));
407 RCU_INIT_POINTER(local->scan_sdata, NULL);
408
409 local->scanning = 0;
410 local->scan_chandef.chan = NULL;
411
412 /* Set power back to normal operating levels. */
413 ieee80211_hw_config(local, 0);
414
415 if (!hw_scan) {
416 ieee80211_configure_filter(local);
417 drv_sw_scan_complete(local, scan_sdata);
418 ieee80211_offchannel_return(local);
419 }
420
421 ieee80211_recalc_idle(local);
422
423 ieee80211_mlme_notify_scan_completed(local);
424 ieee80211_ibss_notify_scan_completed(local);
425
426 /* Requeue all the work that might have been ignored while
427 * the scan was in progress; if there was none this will
428 * just be a no-op for the particular interface.
429 */
430 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
431 if (ieee80211_sdata_running(sdata))
432 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
433 }
434
435 if (was_scanning)
436 ieee80211_start_next_roc(local);
437}
438
439void ieee80211_scan_completed(struct ieee80211_hw *hw,
440 struct cfg80211_scan_info *info)
441{
442 struct ieee80211_local *local = hw_to_local(hw);
443
444 trace_api_scan_completed(local, info->aborted);
445
446 set_bit(SCAN_COMPLETED, &local->scanning);
447 if (info->aborted)
448 set_bit(SCAN_ABORTED, &local->scanning);
449
450 memcpy(&local->scan_info, info, sizeof(*info));
451
452 ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0);
453}
454EXPORT_SYMBOL(ieee80211_scan_completed);
455
456static int ieee80211_start_sw_scan(struct ieee80211_local *local,
457 struct ieee80211_sub_if_data *sdata)
458{
459 /* Software scan is not supported in multi-channel cases */
460 if (local->use_chanctx)
461 return -EOPNOTSUPP;
462
463 /*
464 * Hardware/driver doesn't support hw_scan, so use software
465 * scanning instead. First send a nullfunc frame with power save
466 * bit on so that AP will buffer the frames for us while we are not
467 * listening, then send probe requests to each channel and wait for
468 * the responses. After all channels are scanned, tune back to the
469 * original channel and send a nullfunc frame with power save bit
470 * off to trigger the AP to send us all the buffered frames.
471 *
472 * Note that while local->sw_scanning is true everything else but
473 * nullfunc frames and probe requests will be dropped in
474 * ieee80211_tx_h_check_assoc().
475 */
476 drv_sw_scan_start(local, sdata, local->scan_addr);
477
478 local->leave_oper_channel_time = jiffies;
479 local->next_scan_state = SCAN_DECISION;
480 local->scan_channel_idx = 0;
481
482 ieee80211_offchannel_stop_vifs(local);
483
484 /* ensure nullfunc is transmitted before leaving operating channel */
485 ieee80211_flush_queues(local, NULL, false);
486
487 ieee80211_configure_filter(local);
488
489 /* We need to set power level at maximum rate for scanning. */
490 ieee80211_hw_config(local, 0);
491
492 ieee80211_queue_delayed_work(&local->hw,
493 &local->scan_work, 0);
494
495 return 0;
496}
497
498static bool ieee80211_can_scan(struct ieee80211_local *local,
499 struct ieee80211_sub_if_data *sdata)
500{
501 if (ieee80211_is_radar_required(local))
502 return false;
503
504 if (!list_empty(&local->roc_list))
505 return false;
506
507 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
508 sdata->u.mgd.flags & IEEE80211_STA_CONNECTION_POLL)
509 return false;
510
511 return true;
512}
513
514void ieee80211_run_deferred_scan(struct ieee80211_local *local)
515{
516 lockdep_assert_held(&local->mtx);
517
518 if (!local->scan_req || local->scanning)
519 return;
520
521 if (!ieee80211_can_scan(local,
522 rcu_dereference_protected(
523 local->scan_sdata,
524 lockdep_is_held(&local->mtx))))
525 return;
526
527 ieee80211_queue_delayed_work(&local->hw, &local->scan_work,
528 round_jiffies_relative(0));
529}
530
531static void ieee80211_scan_state_send_probe(struct ieee80211_local *local,
532 unsigned long *next_delay)
533{
534 int i;
535 struct ieee80211_sub_if_data *sdata;
536 struct cfg80211_scan_request *scan_req;
537 enum nl80211_band band = local->hw.conf.chandef.chan->band;
538 u32 tx_flags;
539
540 scan_req = rcu_dereference_protected(local->scan_req,
541 lockdep_is_held(&local->mtx));
542
543 tx_flags = IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
544 if (scan_req->no_cck)
545 tx_flags |= IEEE80211_TX_CTL_NO_CCK_RATE;
546
547 sdata = rcu_dereference_protected(local->scan_sdata,
548 lockdep_is_held(&local->mtx));
549
550 for (i = 0; i < scan_req->n_ssids; i++)
551 ieee80211_send_probe_req(
552 sdata, local->scan_addr, scan_req->bssid,
553 scan_req->ssids[i].ssid, scan_req->ssids[i].ssid_len,
554 scan_req->ie, scan_req->ie_len,
555 scan_req->rates[band], false,
556 tx_flags, local->hw.conf.chandef.chan, true);
557
558 /*
559 * After sending probe requests, wait for probe responses
560 * on the channel.
561 */
562 *next_delay = IEEE80211_CHANNEL_TIME;
563 local->next_scan_state = SCAN_DECISION;
564}
565
566static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata,
567 struct cfg80211_scan_request *req)
568{
569 struct ieee80211_local *local = sdata->local;
570 int rc;
571
572 lockdep_assert_held(&local->mtx);
573
574 if (local->scan_req || ieee80211_is_radar_required(local))
575 return -EBUSY;
576
577 if (!ieee80211_can_scan(local, sdata)) {
578 /* wait for the work to finish/time out */
579 rcu_assign_pointer(local->scan_req, req);
580 rcu_assign_pointer(local->scan_sdata, sdata);
581 return 0;
582 }
583
584 if (local->ops->hw_scan) {
585 u8 *ies;
586
587 local->hw_scan_ies_bufsize = local->scan_ies_len + req->ie_len;
588
589 if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) {
590 int i, n_bands = 0;
591 u8 bands_counted = 0;
592
593 for (i = 0; i < req->n_channels; i++) {
594 if (bands_counted & BIT(req->channels[i]->band))
595 continue;
596 bands_counted |= BIT(req->channels[i]->band);
597 n_bands++;
598 }
599
600 local->hw_scan_ies_bufsize *= n_bands;
601 }
602
603 local->hw_scan_req = kmalloc(
604 sizeof(*local->hw_scan_req) +
605 req->n_channels * sizeof(req->channels[0]) +
606 local->hw_scan_ies_bufsize, GFP_KERNEL);
607 if (!local->hw_scan_req)
608 return -ENOMEM;
609
610 local->hw_scan_req->req.ssids = req->ssids;
611 local->hw_scan_req->req.n_ssids = req->n_ssids;
612 ies = (u8 *)local->hw_scan_req +
613 sizeof(*local->hw_scan_req) +
614 req->n_channels * sizeof(req->channels[0]);
615 local->hw_scan_req->req.ie = ies;
616 local->hw_scan_req->req.flags = req->flags;
617 eth_broadcast_addr(local->hw_scan_req->req.bssid);
618 local->hw_scan_req->req.duration = req->duration;
619 local->hw_scan_req->req.duration_mandatory =
620 req->duration_mandatory;
621
622 local->hw_scan_band = 0;
623
624 /*
625 * After allocating local->hw_scan_req, we must
626 * go through until ieee80211_prep_hw_scan(), so
627 * anything that might be changed here and leave
628 * this function early must not go after this
629 * allocation.
630 */
631 }
632
633 rcu_assign_pointer(local->scan_req, req);
634 rcu_assign_pointer(local->scan_sdata, sdata);
635
636 if (req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR)
637 get_random_mask_addr(local->scan_addr,
638 req->mac_addr,
639 req->mac_addr_mask);
640 else
641 memcpy(local->scan_addr, sdata->vif.addr, ETH_ALEN);
642
643 if (local->ops->hw_scan) {
644 __set_bit(SCAN_HW_SCANNING, &local->scanning);
645 } else if ((req->n_channels == 1) &&
646 (req->channels[0] == local->_oper_chandef.chan)) {
647 /*
648 * If we are scanning only on the operating channel
649 * then we do not need to stop normal activities
650 */
651 unsigned long next_delay;
652
653 __set_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
654
655 ieee80211_recalc_idle(local);
656
657 /* Notify driver scan is starting, keep order of operations
658 * same as normal software scan, in case that matters. */
659 drv_sw_scan_start(local, sdata, local->scan_addr);
660
661 ieee80211_configure_filter(local); /* accept probe-responses */
662
663 /* We need to ensure power level is at max for scanning. */
664 ieee80211_hw_config(local, 0);
665
666 if ((req->channels[0]->flags & (IEEE80211_CHAN_NO_IR |
667 IEEE80211_CHAN_RADAR)) ||
668 !req->n_ssids) {
669 next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
670 } else {
671 ieee80211_scan_state_send_probe(local, &next_delay);
672 next_delay = IEEE80211_CHANNEL_TIME;
673 }
674
675 /* Now, just wait a bit and we are all done! */
676 ieee80211_queue_delayed_work(&local->hw, &local->scan_work,
677 next_delay);
678 return 0;
679 } else {
680 /* Do normal software scan */
681 __set_bit(SCAN_SW_SCANNING, &local->scanning);
682 }
683
684 ieee80211_recalc_idle(local);
685
686 if (local->ops->hw_scan) {
687 WARN_ON(!ieee80211_prep_hw_scan(local));
688 rc = drv_hw_scan(local, sdata, local->hw_scan_req);
689 } else {
690 rc = ieee80211_start_sw_scan(local, sdata);
691 }
692
693 if (rc) {
694 kfree(local->hw_scan_req);
695 local->hw_scan_req = NULL;
696 local->scanning = 0;
697
698 ieee80211_recalc_idle(local);
699
700 local->scan_req = NULL;
701 RCU_INIT_POINTER(local->scan_sdata, NULL);
702 }
703
704 return rc;
705}
706
707static unsigned long
708ieee80211_scan_get_channel_time(struct ieee80211_channel *chan)
709{
710 /*
711 * TODO: channel switching also consumes quite some time,
712 * add that delay as well to get a better estimation
713 */
714 if (chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR))
715 return IEEE80211_PASSIVE_CHANNEL_TIME;
716 return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME;
717}
718
719static void ieee80211_scan_state_decision(struct ieee80211_local *local,
720 unsigned long *next_delay)
721{
722 bool associated = false;
723 bool tx_empty = true;
724 bool bad_latency;
725 struct ieee80211_sub_if_data *sdata;
726 struct ieee80211_channel *next_chan;
727 enum mac80211_scan_state next_scan_state;
728 struct cfg80211_scan_request *scan_req;
729
730 /*
731 * check if at least one STA interface is associated,
732 * check if at least one STA interface has pending tx frames
733 * and grab the lowest used beacon interval
734 */
735 mutex_lock(&local->iflist_mtx);
736 list_for_each_entry(sdata, &local->interfaces, list) {
737 if (!ieee80211_sdata_running(sdata))
738 continue;
739
740 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
741 if (sdata->u.mgd.associated) {
742 associated = true;
743
744 if (!qdisc_all_tx_empty(sdata->dev)) {
745 tx_empty = false;
746 break;
747 }
748 }
749 }
750 }
751 mutex_unlock(&local->iflist_mtx);
752
753 scan_req = rcu_dereference_protected(local->scan_req,
754 lockdep_is_held(&local->mtx));
755
756 next_chan = scan_req->channels[local->scan_channel_idx];
757
758 /*
759 * we're currently scanning a different channel, let's
760 * see if we can scan another channel without interfering
761 * with the current traffic situation.
762 *
763 * Keep good latency, do not stay off-channel more than 125 ms.
764 */
765
766 bad_latency = time_after(jiffies +
767 ieee80211_scan_get_channel_time(next_chan),
768 local->leave_oper_channel_time + HZ / 8);
769
770 if (associated && !tx_empty) {
771 if (scan_req->flags & NL80211_SCAN_FLAG_LOW_PRIORITY)
772 next_scan_state = SCAN_ABORT;
773 else
774 next_scan_state = SCAN_SUSPEND;
775 } else if (associated && bad_latency) {
776 next_scan_state = SCAN_SUSPEND;
777 } else {
778 next_scan_state = SCAN_SET_CHANNEL;
779 }
780
781 local->next_scan_state = next_scan_state;
782
783 *next_delay = 0;
784}
785
786static void ieee80211_scan_state_set_channel(struct ieee80211_local *local,
787 unsigned long *next_delay)
788{
789 int skip;
790 struct ieee80211_channel *chan;
791 enum nl80211_bss_scan_width oper_scan_width;
792 struct cfg80211_scan_request *scan_req;
793
794 scan_req = rcu_dereference_protected(local->scan_req,
795 lockdep_is_held(&local->mtx));
796
797 skip = 0;
798 chan = scan_req->channels[local->scan_channel_idx];
799
800 local->scan_chandef.chan = chan;
801 local->scan_chandef.center_freq1 = chan->center_freq;
802 local->scan_chandef.center_freq2 = 0;
803 switch (scan_req->scan_width) {
804 case NL80211_BSS_CHAN_WIDTH_5:
805 local->scan_chandef.width = NL80211_CHAN_WIDTH_5;
806 break;
807 case NL80211_BSS_CHAN_WIDTH_10:
808 local->scan_chandef.width = NL80211_CHAN_WIDTH_10;
809 break;
810 case NL80211_BSS_CHAN_WIDTH_20:
811 /* If scanning on oper channel, use whatever channel-type
812 * is currently in use.
813 */
814 oper_scan_width = cfg80211_chandef_to_scan_width(
815 &local->_oper_chandef);
816 if (chan == local->_oper_chandef.chan &&
817 oper_scan_width == scan_req->scan_width)
818 local->scan_chandef = local->_oper_chandef;
819 else
820 local->scan_chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
821 break;
822 }
823
824 if (ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL))
825 skip = 1;
826
827 /* advance state machine to next channel/band */
828 local->scan_channel_idx++;
829
830 if (skip) {
831 /* if we skip this channel return to the decision state */
832 local->next_scan_state = SCAN_DECISION;
833 return;
834 }
835
836 /*
837 * Probe delay is used to update the NAV, cf. 11.1.3.2.2
838 * (which unfortunately doesn't say _why_ step a) is done,
839 * but it waits for the probe delay or until a frame is
840 * received - and the received frame would update the NAV).
841 * For now, we do not support waiting until a frame is
842 * received.
843 *
844 * In any case, it is not necessary for a passive scan.
845 */
846 if ((chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR)) ||
847 !scan_req->n_ssids) {
848 *next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
849 local->next_scan_state = SCAN_DECISION;
850 return;
851 }
852
853 /* active scan, send probes */
854 *next_delay = IEEE80211_PROBE_DELAY;
855 local->next_scan_state = SCAN_SEND_PROBE;
856}
857
858static void ieee80211_scan_state_suspend(struct ieee80211_local *local,
859 unsigned long *next_delay)
860{
861 /* switch back to the operating channel */
862 local->scan_chandef.chan = NULL;
863 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_CHANNEL);
864
865 /* disable PS */
866 ieee80211_offchannel_return(local);
867
868 *next_delay = HZ / 5;
869 /* afterwards, resume scan & go to next channel */
870 local->next_scan_state = SCAN_RESUME;
871}
872
873static void ieee80211_scan_state_resume(struct ieee80211_local *local,
874 unsigned long *next_delay)
875{
876 ieee80211_offchannel_stop_vifs(local);
877
878 if (local->ops->flush) {
879 ieee80211_flush_queues(local, NULL, false);
880 *next_delay = 0;
881 } else
882 *next_delay = HZ / 10;
883
884 /* remember when we left the operating channel */
885 local->leave_oper_channel_time = jiffies;
886
887 /* advance to the next channel to be scanned */
888 local->next_scan_state = SCAN_SET_CHANNEL;
889}
890
891void ieee80211_scan_work(struct work_struct *work)
892{
893 struct ieee80211_local *local =
894 container_of(work, struct ieee80211_local, scan_work.work);
895 struct ieee80211_sub_if_data *sdata;
896 struct cfg80211_scan_request *scan_req;
897 unsigned long next_delay = 0;
898 bool aborted;
899
900 mutex_lock(&local->mtx);
901
902 if (!ieee80211_can_run_worker(local)) {
903 aborted = true;
904 goto out_complete;
905 }
906
907 sdata = rcu_dereference_protected(local->scan_sdata,
908 lockdep_is_held(&local->mtx));
909 scan_req = rcu_dereference_protected(local->scan_req,
910 lockdep_is_held(&local->mtx));
911
912 /* When scanning on-channel, the first-callback means completed. */
913 if (test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning)) {
914 aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning);
915 goto out_complete;
916 }
917
918 if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) {
919 aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning);
920 goto out_complete;
921 }
922
923 if (!sdata || !scan_req)
924 goto out;
925
926 if (!local->scanning) {
927 int rc;
928
929 RCU_INIT_POINTER(local->scan_req, NULL);
930 RCU_INIT_POINTER(local->scan_sdata, NULL);
931
932 rc = __ieee80211_start_scan(sdata, scan_req);
933 if (rc) {
934 /* need to complete scan in cfg80211 */
935 rcu_assign_pointer(local->scan_req, scan_req);
936 aborted = true;
937 goto out_complete;
938 } else
939 goto out;
940 }
941
942 /*
943 * as long as no delay is required advance immediately
944 * without scheduling a new work
945 */
946 do {
947 if (!ieee80211_sdata_running(sdata)) {
948 aborted = true;
949 goto out_complete;
950 }
951
952 switch (local->next_scan_state) {
953 case SCAN_DECISION:
954 /* if no more bands/channels left, complete scan */
955 if (local->scan_channel_idx >= scan_req->n_channels) {
956 aborted = false;
957 goto out_complete;
958 }
959 ieee80211_scan_state_decision(local, &next_delay);
960 break;
961 case SCAN_SET_CHANNEL:
962 ieee80211_scan_state_set_channel(local, &next_delay);
963 break;
964 case SCAN_SEND_PROBE:
965 ieee80211_scan_state_send_probe(local, &next_delay);
966 break;
967 case SCAN_SUSPEND:
968 ieee80211_scan_state_suspend(local, &next_delay);
969 break;
970 case SCAN_RESUME:
971 ieee80211_scan_state_resume(local, &next_delay);
972 break;
973 case SCAN_ABORT:
974 aborted = true;
975 goto out_complete;
976 }
977 } while (next_delay == 0);
978
979 ieee80211_queue_delayed_work(&local->hw, &local->scan_work, next_delay);
980 goto out;
981
982out_complete:
983 __ieee80211_scan_completed(&local->hw, aborted);
984out:
985 mutex_unlock(&local->mtx);
986}
987
988int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata,
989 struct cfg80211_scan_request *req)
990{
991 int res;
992
993 mutex_lock(&sdata->local->mtx);
994 res = __ieee80211_start_scan(sdata, req);
995 mutex_unlock(&sdata->local->mtx);
996
997 return res;
998}
999
1000int ieee80211_request_ibss_scan(struct ieee80211_sub_if_data *sdata,
1001 const u8 *ssid, u8 ssid_len,
1002 struct ieee80211_channel **channels,
1003 unsigned int n_channels,
1004 enum nl80211_bss_scan_width scan_width)
1005{
1006 struct ieee80211_local *local = sdata->local;
1007 int ret = -EBUSY, i, n_ch = 0;
1008 enum nl80211_band band;
1009
1010 mutex_lock(&local->mtx);
1011
1012 /* busy scanning */
1013 if (local->scan_req)
1014 goto unlock;
1015
1016 /* fill internal scan request */
1017 if (!channels) {
1018 int max_n;
1019
1020 for (band = 0; band < NUM_NL80211_BANDS; band++) {
1021 if (!local->hw.wiphy->bands[band])
1022 continue;
1023
1024 max_n = local->hw.wiphy->bands[band]->n_channels;
1025 for (i = 0; i < max_n; i++) {
1026 struct ieee80211_channel *tmp_ch =
1027 &local->hw.wiphy->bands[band]->channels[i];
1028
1029 if (tmp_ch->flags & (IEEE80211_CHAN_NO_IR |
1030 IEEE80211_CHAN_DISABLED))
1031 continue;
1032
1033 local->int_scan_req->channels[n_ch] = tmp_ch;
1034 n_ch++;
1035 }
1036 }
1037
1038 if (WARN_ON_ONCE(n_ch == 0))
1039 goto unlock;
1040
1041 local->int_scan_req->n_channels = n_ch;
1042 } else {
1043 for (i = 0; i < n_channels; i++) {
1044 if (channels[i]->flags & (IEEE80211_CHAN_NO_IR |
1045 IEEE80211_CHAN_DISABLED))
1046 continue;
1047
1048 local->int_scan_req->channels[n_ch] = channels[i];
1049 n_ch++;
1050 }
1051
1052 if (WARN_ON_ONCE(n_ch == 0))
1053 goto unlock;
1054
1055 local->int_scan_req->n_channels = n_ch;
1056 }
1057
1058 local->int_scan_req->ssids = &local->scan_ssid;
1059 local->int_scan_req->n_ssids = 1;
1060 local->int_scan_req->scan_width = scan_width;
1061 memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN);
1062 local->int_scan_req->ssids[0].ssid_len = ssid_len;
1063
1064 ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req);
1065 unlock:
1066 mutex_unlock(&local->mtx);
1067 return ret;
1068}
1069
1070/*
1071 * Only call this function when a scan can't be queued -- under RTNL.
1072 */
1073void ieee80211_scan_cancel(struct ieee80211_local *local)
1074{
1075 /*
1076 * We are canceling software scan, or deferred scan that was not
1077 * yet really started (see __ieee80211_start_scan ).
1078 *
1079 * Regarding hardware scan:
1080 * - we can not call __ieee80211_scan_completed() as when
1081 * SCAN_HW_SCANNING bit is set this function change
1082 * local->hw_scan_req to operate on 5G band, what race with
1083 * driver which can use local->hw_scan_req
1084 *
1085 * - we can not cancel scan_work since driver can schedule it
1086 * by ieee80211_scan_completed(..., true) to finish scan
1087 *
1088 * Hence we only call the cancel_hw_scan() callback, but the low-level
1089 * driver is still responsible for calling ieee80211_scan_completed()
1090 * after the scan was completed/aborted.
1091 */
1092
1093 mutex_lock(&local->mtx);
1094 if (!local->scan_req)
1095 goto out;
1096
1097 /*
1098 * We have a scan running and the driver already reported completion,
1099 * but the worker hasn't run yet or is stuck on the mutex - mark it as
1100 * cancelled.
1101 */
1102 if (test_bit(SCAN_HW_SCANNING, &local->scanning) &&
1103 test_bit(SCAN_COMPLETED, &local->scanning)) {
1104 set_bit(SCAN_HW_CANCELLED, &local->scanning);
1105 goto out;
1106 }
1107
1108 if (test_bit(SCAN_HW_SCANNING, &local->scanning)) {
1109 /*
1110 * Make sure that __ieee80211_scan_completed doesn't trigger a
1111 * scan on another band.
1112 */
1113 set_bit(SCAN_HW_CANCELLED, &local->scanning);
1114 if (local->ops->cancel_hw_scan)
1115 drv_cancel_hw_scan(local,
1116 rcu_dereference_protected(local->scan_sdata,
1117 lockdep_is_held(&local->mtx)));
1118 goto out;
1119 }
1120
1121 /*
1122 * If the work is currently running, it must be blocked on
1123 * the mutex, but we'll set scan_sdata = NULL and it'll
1124 * simply exit once it acquires the mutex.
1125 */
1126 cancel_delayed_work(&local->scan_work);
1127 /* and clean up */
1128 memset(&local->scan_info, 0, sizeof(local->scan_info));
1129 __ieee80211_scan_completed(&local->hw, true);
1130out:
1131 mutex_unlock(&local->mtx);
1132}
1133
1134int __ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata,
1135 struct cfg80211_sched_scan_request *req)
1136{
1137 struct ieee80211_local *local = sdata->local;
1138 struct ieee80211_scan_ies sched_scan_ies = {};
1139 struct cfg80211_chan_def chandef;
1140 int ret, i, iebufsz, num_bands = 0;
1141 u32 rate_masks[NUM_NL80211_BANDS] = {};
1142 u8 bands_used = 0;
1143 u8 *ie;
1144
1145 iebufsz = local->scan_ies_len + req->ie_len;
1146
1147 lockdep_assert_held(&local->mtx);
1148
1149 if (!local->ops->sched_scan_start)
1150 return -ENOTSUPP;
1151
1152 for (i = 0; i < NUM_NL80211_BANDS; i++) {
1153 if (local->hw.wiphy->bands[i]) {
1154 bands_used |= BIT(i);
1155 rate_masks[i] = (u32) -1;
1156 num_bands++;
1157 }
1158 }
1159
1160 ie = kzalloc(num_bands * iebufsz, GFP_KERNEL);
1161 if (!ie) {
1162 ret = -ENOMEM;
1163 goto out;
1164 }
1165
1166 ieee80211_prepare_scan_chandef(&chandef, req->scan_width);
1167
1168 ieee80211_build_preq_ies(local, ie, num_bands * iebufsz,
1169 &sched_scan_ies, req->ie,
1170 req->ie_len, bands_used, rate_masks, &chandef);
1171
1172 ret = drv_sched_scan_start(local, sdata, req, &sched_scan_ies);
1173 if (ret == 0) {
1174 rcu_assign_pointer(local->sched_scan_sdata, sdata);
1175 rcu_assign_pointer(local->sched_scan_req, req);
1176 }
1177
1178 kfree(ie);
1179
1180out:
1181 if (ret) {
1182 /* Clean in case of failure after HW restart or upon resume. */
1183 RCU_INIT_POINTER(local->sched_scan_sdata, NULL);
1184 RCU_INIT_POINTER(local->sched_scan_req, NULL);
1185 }
1186
1187 return ret;
1188}
1189
1190int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata,
1191 struct cfg80211_sched_scan_request *req)
1192{
1193 struct ieee80211_local *local = sdata->local;
1194 int ret;
1195
1196 mutex_lock(&local->mtx);
1197
1198 if (rcu_access_pointer(local->sched_scan_sdata)) {
1199 mutex_unlock(&local->mtx);
1200 return -EBUSY;
1201 }
1202
1203 ret = __ieee80211_request_sched_scan_start(sdata, req);
1204
1205 mutex_unlock(&local->mtx);
1206 return ret;
1207}
1208
1209int ieee80211_request_sched_scan_stop(struct ieee80211_local *local)
1210{
1211 struct ieee80211_sub_if_data *sched_scan_sdata;
1212 int ret = -ENOENT;
1213
1214 mutex_lock(&local->mtx);
1215
1216 if (!local->ops->sched_scan_stop) {
1217 ret = -ENOTSUPP;
1218 goto out;
1219 }
1220
1221 /* We don't want to restart sched scan anymore. */
1222 RCU_INIT_POINTER(local->sched_scan_req, NULL);
1223
1224 sched_scan_sdata = rcu_dereference_protected(local->sched_scan_sdata,
1225 lockdep_is_held(&local->mtx));
1226 if (sched_scan_sdata) {
1227 ret = drv_sched_scan_stop(local, sched_scan_sdata);
1228 if (!ret)
1229 RCU_INIT_POINTER(local->sched_scan_sdata, NULL);
1230 }
1231out:
1232 mutex_unlock(&local->mtx);
1233
1234 return ret;
1235}
1236
1237void ieee80211_sched_scan_results(struct ieee80211_hw *hw)
1238{
1239 struct ieee80211_local *local = hw_to_local(hw);
1240
1241 trace_api_sched_scan_results(local);
1242
1243 cfg80211_sched_scan_results(hw->wiphy, 0);
1244}
1245EXPORT_SYMBOL(ieee80211_sched_scan_results);
1246
1247void ieee80211_sched_scan_end(struct ieee80211_local *local)
1248{
1249 mutex_lock(&local->mtx);
1250
1251 if (!rcu_access_pointer(local->sched_scan_sdata)) {
1252 mutex_unlock(&local->mtx);
1253 return;
1254 }
1255
1256 RCU_INIT_POINTER(local->sched_scan_sdata, NULL);
1257
1258 /* If sched scan was aborted by the driver. */
1259 RCU_INIT_POINTER(local->sched_scan_req, NULL);
1260
1261 mutex_unlock(&local->mtx);
1262
1263 cfg80211_sched_scan_stopped(local->hw.wiphy, 0);
1264}
1265
1266void ieee80211_sched_scan_stopped_work(struct work_struct *work)
1267{
1268 struct ieee80211_local *local =
1269 container_of(work, struct ieee80211_local,
1270 sched_scan_stopped_work);
1271
1272 ieee80211_sched_scan_end(local);
1273}
1274
1275void ieee80211_sched_scan_stopped(struct ieee80211_hw *hw)
1276{
1277 struct ieee80211_local *local = hw_to_local(hw);
1278
1279 trace_api_sched_scan_stopped(local);
1280
1281 /*
1282 * this shouldn't really happen, so for simplicity
1283 * simply ignore it, and let mac80211 reconfigure
1284 * the sched scan later on.
1285 */
1286 if (local->in_reconfig)
1287 return;
1288
1289 schedule_work(&local->sched_scan_stopped_work);
1290}
1291EXPORT_SYMBOL(ieee80211_sched_scan_stopped);
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) 2018-2024 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
32void ieee80211_rx_bss_put(struct ieee80211_local *local,
33 struct ieee80211_bss *bss)
34{
35 if (!bss)
36 return;
37 cfg80211_put_bss(local->hw.wiphy,
38 container_of((void *)bss, struct cfg80211_bss, priv));
39}
40
41static bool is_uapsd_supported(struct ieee802_11_elems *elems)
42{
43 u8 qos_info;
44
45 if (elems->wmm_info && elems->wmm_info_len == 7
46 && elems->wmm_info[5] == 1)
47 qos_info = elems->wmm_info[6];
48 else if (elems->wmm_param && elems->wmm_param_len == 24
49 && elems->wmm_param[5] == 1)
50 qos_info = elems->wmm_param[6];
51 else
52 /* no valid wmm information or parameter element found */
53 return false;
54
55 return qos_info & IEEE80211_WMM_IE_AP_QOSINFO_UAPSD;
56}
57
58struct inform_bss_update_data {
59 struct ieee80211_rx_status *rx_status;
60 bool beacon;
61};
62
63void ieee80211_inform_bss(struct wiphy *wiphy,
64 struct cfg80211_bss *cbss,
65 const struct cfg80211_bss_ies *ies,
66 void *data)
67{
68 struct ieee80211_local *local = wiphy_priv(wiphy);
69 struct inform_bss_update_data *update_data = data;
70 struct ieee80211_bss *bss = (void *)cbss->priv;
71 struct ieee80211_rx_status *rx_status;
72 struct ieee802_11_elems *elems;
73 int clen, srlen;
74
75 /* This happens while joining an IBSS */
76 if (!update_data)
77 return;
78
79 elems = ieee802_11_parse_elems(ies->data, ies->len, false, NULL);
80 if (!elems)
81 return;
82
83 rx_status = update_data->rx_status;
84
85 if (update_data->beacon)
86 bss->device_ts_beacon = rx_status->device_timestamp;
87 else
88 bss->device_ts_presp = rx_status->device_timestamp;
89
90 if (elems->parse_error) {
91 if (update_data->beacon)
92 bss->corrupt_data |= IEEE80211_BSS_CORRUPT_BEACON;
93 else
94 bss->corrupt_data |= IEEE80211_BSS_CORRUPT_PROBE_RESP;
95 } else {
96 if (update_data->beacon)
97 bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_BEACON;
98 else
99 bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_PROBE_RESP;
100 }
101
102 /* save the ERP value so that it is available at association time */
103 if (elems->erp_info && (!elems->parse_error ||
104 !(bss->valid_data & IEEE80211_BSS_VALID_ERP))) {
105 bss->erp_value = elems->erp_info[0];
106 bss->has_erp_value = true;
107 if (!elems->parse_error)
108 bss->valid_data |= IEEE80211_BSS_VALID_ERP;
109 }
110
111 /* replace old supported rates if we get new values */
112 if (!elems->parse_error ||
113 !(bss->valid_data & IEEE80211_BSS_VALID_RATES)) {
114 srlen = 0;
115 if (elems->supp_rates) {
116 clen = IEEE80211_MAX_SUPP_RATES;
117 if (clen > elems->supp_rates_len)
118 clen = elems->supp_rates_len;
119 memcpy(bss->supp_rates, elems->supp_rates, clen);
120 srlen += clen;
121 }
122 if (elems->ext_supp_rates) {
123 clen = IEEE80211_MAX_SUPP_RATES - srlen;
124 if (clen > elems->ext_supp_rates_len)
125 clen = elems->ext_supp_rates_len;
126 memcpy(bss->supp_rates + srlen, elems->ext_supp_rates,
127 clen);
128 srlen += clen;
129 }
130 if (srlen) {
131 bss->supp_rates_len = srlen;
132 if (!elems->parse_error)
133 bss->valid_data |= IEEE80211_BSS_VALID_RATES;
134 }
135 }
136
137 if (!elems->parse_error ||
138 !(bss->valid_data & IEEE80211_BSS_VALID_WMM)) {
139 bss->wmm_used = elems->wmm_param || elems->wmm_info;
140 bss->uapsd_supported = is_uapsd_supported(elems);
141 if (!elems->parse_error)
142 bss->valid_data |= IEEE80211_BSS_VALID_WMM;
143 }
144
145 if (update_data->beacon) {
146 struct ieee80211_supported_band *sband =
147 local->hw.wiphy->bands[rx_status->band];
148 if (!(rx_status->encoding == RX_ENC_HT) &&
149 !(rx_status->encoding == RX_ENC_VHT))
150 bss->beacon_rate =
151 &sband->bitrates[rx_status->rate_idx];
152 }
153
154 if (elems->vht_cap_elem)
155 bss->vht_cap_info =
156 le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
157 else
158 bss->vht_cap_info = 0;
159
160 kfree(elems);
161}
162
163struct ieee80211_bss *
164ieee80211_bss_info_update(struct ieee80211_local *local,
165 struct ieee80211_rx_status *rx_status,
166 struct ieee80211_mgmt *mgmt, size_t len,
167 struct ieee80211_channel *channel)
168{
169 bool beacon = ieee80211_is_beacon(mgmt->frame_control) ||
170 ieee80211_is_s1g_beacon(mgmt->frame_control);
171 struct cfg80211_bss *cbss;
172 struct inform_bss_update_data update_data = {
173 .rx_status = rx_status,
174 .beacon = beacon,
175 };
176 struct cfg80211_inform_bss bss_meta = {
177 .boottime_ns = rx_status->boottime_ns,
178 .drv_data = (void *)&update_data,
179 };
180 bool signal_valid;
181 struct ieee80211_sub_if_data *scan_sdata;
182
183 if (rx_status->flag & RX_FLAG_NO_SIGNAL_VAL)
184 bss_meta.signal = 0; /* invalid signal indication */
185 else if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
186 bss_meta.signal = rx_status->signal * 100;
187 else if (ieee80211_hw_check(&local->hw, SIGNAL_UNSPEC))
188 bss_meta.signal = (rx_status->signal * 100) / local->hw.max_signal;
189
190 bss_meta.chan = channel;
191
192 rcu_read_lock();
193 scan_sdata = rcu_dereference(local->scan_sdata);
194 if (scan_sdata && scan_sdata->vif.type == NL80211_IFTYPE_STATION &&
195 scan_sdata->vif.cfg.assoc &&
196 ieee80211_have_rx_timestamp(rx_status)) {
197 struct ieee80211_bss_conf *link_conf = NULL;
198
199 /* for an MLO connection, set the TSF data only in case we have
200 * an indication on which of the links the frame was received
201 */
202 if (ieee80211_vif_is_mld(&scan_sdata->vif)) {
203 if (rx_status->link_valid) {
204 s8 link_id = rx_status->link_id;
205
206 link_conf =
207 rcu_dereference(scan_sdata->vif.link_conf[link_id]);
208 }
209 } else {
210 link_conf = &scan_sdata->vif.bss_conf;
211 }
212
213 if (link_conf) {
214 bss_meta.parent_tsf =
215 ieee80211_calculate_rx_timestamp(local,
216 rx_status,
217 len + FCS_LEN,
218 24);
219
220 ether_addr_copy(bss_meta.parent_bssid,
221 link_conf->bssid);
222 }
223 }
224 rcu_read_unlock();
225
226 cbss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta,
227 mgmt, len, GFP_ATOMIC);
228 if (!cbss)
229 return NULL;
230
231 /* In case the signal is invalid update the status */
232 signal_valid = channel == cbss->channel;
233 if (!signal_valid)
234 rx_status->flag |= RX_FLAG_NO_SIGNAL_VAL;
235
236 return (void *)cbss->priv;
237}
238
239static bool ieee80211_scan_accept_presp(struct ieee80211_sub_if_data *sdata,
240 struct ieee80211_channel *channel,
241 u32 scan_flags, const u8 *da)
242{
243 if (!sdata)
244 return false;
245
246 /* accept broadcast on 6 GHz and for OCE */
247 if (is_broadcast_ether_addr(da) &&
248 (channel->band == NL80211_BAND_6GHZ ||
249 scan_flags & NL80211_SCAN_FLAG_ACCEPT_BCAST_PROBE_RESP))
250 return true;
251
252 if (scan_flags & NL80211_SCAN_FLAG_RANDOM_ADDR)
253 return true;
254 return ether_addr_equal(da, sdata->vif.addr);
255}
256
257void ieee80211_scan_rx(struct ieee80211_local *local, struct sk_buff *skb)
258{
259 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
260 struct ieee80211_mgmt *mgmt = (void *)skb->data;
261 struct ieee80211_bss *bss;
262 struct ieee80211_channel *channel;
263 size_t min_hdr_len = offsetof(struct ieee80211_mgmt,
264 u.probe_resp.variable);
265
266 if (!ieee80211_is_probe_resp(mgmt->frame_control) &&
267 !ieee80211_is_beacon(mgmt->frame_control) &&
268 !ieee80211_is_s1g_beacon(mgmt->frame_control))
269 return;
270
271 if (ieee80211_is_s1g_beacon(mgmt->frame_control)) {
272 if (ieee80211_is_s1g_short_beacon(mgmt->frame_control))
273 min_hdr_len = offsetof(struct ieee80211_ext,
274 u.s1g_short_beacon.variable);
275 else
276 min_hdr_len = offsetof(struct ieee80211_ext,
277 u.s1g_beacon);
278 }
279
280 if (skb->len < min_hdr_len)
281 return;
282
283 if (test_and_clear_bit(SCAN_BEACON_WAIT, &local->scanning)) {
284 /*
285 * we were passive scanning because of radar/no-IR, but
286 * the beacon/proberesp rx gives us an opportunity to upgrade
287 * to active scan
288 */
289 set_bit(SCAN_BEACON_DONE, &local->scanning);
290 wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work, 0);
291 }
292
293 channel = ieee80211_get_channel_khz(local->hw.wiphy,
294 ieee80211_rx_status_to_khz(rx_status));
295
296 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
297 return;
298
299 if (ieee80211_is_probe_resp(mgmt->frame_control)) {
300 struct ieee80211_sub_if_data *sdata1, *sdata2;
301 struct cfg80211_scan_request *scan_req;
302 struct cfg80211_sched_scan_request *sched_scan_req;
303 u32 scan_req_flags = 0, sched_scan_req_flags = 0;
304
305 sdata1 = rcu_dereference(local->scan_sdata);
306 sdata2 = rcu_dereference(local->sched_scan_sdata);
307
308 if (likely(!sdata1 && !sdata2))
309 return;
310
311 scan_req = rcu_dereference(local->scan_req);
312 sched_scan_req = rcu_dereference(local->sched_scan_req);
313
314 if (scan_req)
315 scan_req_flags = scan_req->flags;
316
317 if (sched_scan_req)
318 sched_scan_req_flags = sched_scan_req->flags;
319
320 /* ignore ProbeResp to foreign address or non-bcast (OCE)
321 * unless scanning with randomised address
322 */
323 if (!ieee80211_scan_accept_presp(sdata1, channel,
324 scan_req_flags,
325 mgmt->da) &&
326 !ieee80211_scan_accept_presp(sdata2, channel,
327 sched_scan_req_flags,
328 mgmt->da))
329 return;
330 } else {
331 /* Beacons are expected only with broadcast address */
332 if (!is_broadcast_ether_addr(mgmt->da))
333 return;
334 }
335
336 /* Do not update the BSS table in case of only monitor interfaces */
337 if (local->open_count == local->monitors)
338 return;
339
340 bss = ieee80211_bss_info_update(local, rx_status,
341 mgmt, skb->len,
342 channel);
343 if (bss)
344 ieee80211_rx_bss_put(local, bss);
345}
346
347static void ieee80211_prepare_scan_chandef(struct cfg80211_chan_def *chandef)
348{
349 memset(chandef, 0, sizeof(*chandef));
350
351 chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
352}
353
354/* return false if no more work */
355static bool ieee80211_prep_hw_scan(struct ieee80211_sub_if_data *sdata)
356{
357 struct ieee80211_local *local = sdata->local;
358 struct cfg80211_scan_request *req;
359 struct cfg80211_chan_def chandef;
360 u8 bands_used = 0;
361 int i, ielen, n_chans;
362 u32 flags = 0;
363
364 req = rcu_dereference_protected(local->scan_req,
365 lockdep_is_held(&local->hw.wiphy->mtx));
366
367 if (test_bit(SCAN_HW_CANCELLED, &local->scanning))
368 return false;
369
370 if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) {
371 for (i = 0; i < req->n_channels; i++) {
372 local->hw_scan_req->req.channels[i] = req->channels[i];
373 bands_used |= BIT(req->channels[i]->band);
374 }
375
376 n_chans = req->n_channels;
377 } else {
378 do {
379 if (local->hw_scan_band == NUM_NL80211_BANDS)
380 return false;
381
382 n_chans = 0;
383
384 for (i = 0; i < req->n_channels; i++) {
385 if (req->channels[i]->band !=
386 local->hw_scan_band)
387 continue;
388 local->hw_scan_req->req.channels[n_chans] =
389 req->channels[i];
390 n_chans++;
391 bands_used |= BIT(req->channels[i]->band);
392 }
393
394 local->hw_scan_band++;
395 } while (!n_chans);
396 }
397
398 local->hw_scan_req->req.n_channels = n_chans;
399 ieee80211_prepare_scan_chandef(&chandef);
400
401 if (req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT)
402 flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT;
403
404 ielen = ieee80211_build_preq_ies(sdata,
405 (u8 *)local->hw_scan_req->req.ie,
406 local->hw_scan_ies_bufsize,
407 &local->hw_scan_req->ies,
408 req->ie, req->ie_len,
409 bands_used, req->rates, &chandef,
410 flags);
411 if (ielen < 0)
412 return false;
413 local->hw_scan_req->req.ie_len = ielen;
414 local->hw_scan_req->req.no_cck = req->no_cck;
415 ether_addr_copy(local->hw_scan_req->req.mac_addr, req->mac_addr);
416 ether_addr_copy(local->hw_scan_req->req.mac_addr_mask,
417 req->mac_addr_mask);
418 ether_addr_copy(local->hw_scan_req->req.bssid, req->bssid);
419
420 return true;
421}
422
423static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted)
424{
425 struct ieee80211_local *local = hw_to_local(hw);
426 bool hw_scan = test_bit(SCAN_HW_SCANNING, &local->scanning);
427 bool was_scanning = local->scanning;
428 struct cfg80211_scan_request *scan_req;
429 struct ieee80211_sub_if_data *scan_sdata;
430 struct ieee80211_sub_if_data *sdata;
431
432 lockdep_assert_wiphy(local->hw.wiphy);
433
434 /*
435 * It's ok to abort a not-yet-running scan (that
436 * we have one at all will be verified by checking
437 * local->scan_req next), but not to complete it
438 * successfully.
439 */
440 if (WARN_ON(!local->scanning && !aborted))
441 aborted = true;
442
443 if (WARN_ON(!local->scan_req))
444 return;
445
446 scan_sdata = rcu_dereference_protected(local->scan_sdata,
447 lockdep_is_held(&local->hw.wiphy->mtx));
448
449 if (hw_scan && !aborted &&
450 !ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS) &&
451 ieee80211_prep_hw_scan(scan_sdata)) {
452 int rc;
453
454 rc = drv_hw_scan(local,
455 rcu_dereference_protected(local->scan_sdata,
456 lockdep_is_held(&local->hw.wiphy->mtx)),
457 local->hw_scan_req);
458
459 if (rc == 0)
460 return;
461
462 /* HW scan failed and is going to be reported as aborted,
463 * so clear old scan info.
464 */
465 memset(&local->scan_info, 0, sizeof(local->scan_info));
466 aborted = true;
467 }
468
469 kfree(local->hw_scan_req);
470 local->hw_scan_req = NULL;
471
472 scan_req = rcu_dereference_protected(local->scan_req,
473 lockdep_is_held(&local->hw.wiphy->mtx));
474
475 RCU_INIT_POINTER(local->scan_req, NULL);
476 RCU_INIT_POINTER(local->scan_sdata, NULL);
477
478 local->scanning = 0;
479 local->scan_chandef.chan = NULL;
480
481 synchronize_rcu();
482
483 if (scan_req != local->int_scan_req) {
484 local->scan_info.aborted = aborted;
485 cfg80211_scan_done(scan_req, &local->scan_info);
486 }
487
488 /* Set power back to normal operating levels. */
489 ieee80211_hw_conf_chan(local);
490
491 if (!hw_scan && was_scanning) {
492 ieee80211_configure_filter(local);
493 drv_sw_scan_complete(local, scan_sdata);
494 ieee80211_offchannel_return(local);
495 }
496
497 ieee80211_recalc_idle(local);
498
499 ieee80211_mlme_notify_scan_completed(local);
500 ieee80211_ibss_notify_scan_completed(local);
501
502 /* Requeue all the work that might have been ignored while
503 * the scan was in progress; if there was none this will
504 * just be a no-op for the particular interface.
505 */
506 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
507 if (ieee80211_sdata_running(sdata))
508 wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work);
509 }
510
511 if (was_scanning)
512 ieee80211_start_next_roc(local);
513}
514
515void ieee80211_scan_completed(struct ieee80211_hw *hw,
516 struct cfg80211_scan_info *info)
517{
518 struct ieee80211_local *local = hw_to_local(hw);
519
520 trace_api_scan_completed(local, info->aborted);
521
522 set_bit(SCAN_COMPLETED, &local->scanning);
523 if (info->aborted)
524 set_bit(SCAN_ABORTED, &local->scanning);
525
526 memcpy(&local->scan_info, info, sizeof(*info));
527
528 wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work, 0);
529}
530EXPORT_SYMBOL(ieee80211_scan_completed);
531
532static int ieee80211_start_sw_scan(struct ieee80211_local *local,
533 struct ieee80211_sub_if_data *sdata)
534{
535 /* Software scan is not supported in multi-channel cases */
536 if (!local->emulate_chanctx)
537 return -EOPNOTSUPP;
538
539 /*
540 * Hardware/driver doesn't support hw_scan, so use software
541 * scanning instead. First send a nullfunc frame with power save
542 * bit on so that AP will buffer the frames for us while we are not
543 * listening, then send probe requests to each channel and wait for
544 * the responses. After all channels are scanned, tune back to the
545 * original channel and send a nullfunc frame with power save bit
546 * off to trigger the AP to send us all the buffered frames.
547 *
548 * Note that while local->sw_scanning is true everything else but
549 * nullfunc frames and probe requests will be dropped in
550 * ieee80211_tx_h_check_assoc().
551 */
552 drv_sw_scan_start(local, sdata, local->scan_addr);
553
554 local->leave_oper_channel_time = jiffies;
555 local->next_scan_state = SCAN_DECISION;
556 local->scan_channel_idx = 0;
557
558 ieee80211_offchannel_stop_vifs(local);
559
560 /* ensure nullfunc is transmitted before leaving operating channel */
561 ieee80211_flush_queues(local, NULL, false);
562
563 ieee80211_configure_filter(local);
564
565 /* We need to set power level at maximum rate for scanning. */
566 ieee80211_hw_conf_chan(local);
567
568 wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work, 0);
569
570 return 0;
571}
572
573static bool __ieee80211_can_leave_ch(struct ieee80211_sub_if_data *sdata)
574{
575 struct ieee80211_local *local = sdata->local;
576 struct ieee80211_sub_if_data *sdata_iter;
577
578 lockdep_assert_wiphy(local->hw.wiphy);
579
580 if (!ieee80211_is_radar_required(local))
581 return true;
582
583 if (!regulatory_pre_cac_allowed(local->hw.wiphy))
584 return false;
585
586 list_for_each_entry(sdata_iter, &local->interfaces, list) {
587 if (sdata_iter->wdev.cac_started)
588 return false;
589 }
590
591 return true;
592}
593
594static bool ieee80211_can_scan(struct ieee80211_local *local,
595 struct ieee80211_sub_if_data *sdata)
596{
597 if (!__ieee80211_can_leave_ch(sdata))
598 return false;
599
600 if (!list_empty(&local->roc_list))
601 return false;
602
603 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
604 sdata->u.mgd.flags & IEEE80211_STA_CONNECTION_POLL)
605 return false;
606
607 return true;
608}
609
610void ieee80211_run_deferred_scan(struct ieee80211_local *local)
611{
612 lockdep_assert_wiphy(local->hw.wiphy);
613
614 if (!local->scan_req || local->scanning)
615 return;
616
617 if (!ieee80211_can_scan(local,
618 rcu_dereference_protected(
619 local->scan_sdata,
620 lockdep_is_held(&local->hw.wiphy->mtx))))
621 return;
622
623 wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work,
624 round_jiffies_relative(0));
625}
626
627static void ieee80211_send_scan_probe_req(struct ieee80211_sub_if_data *sdata,
628 const u8 *src, const u8 *dst,
629 const u8 *ssid, size_t ssid_len,
630 const u8 *ie, size_t ie_len,
631 u32 ratemask, u32 flags, u32 tx_flags,
632 struct ieee80211_channel *channel)
633{
634 struct sk_buff *skb;
635
636 skb = ieee80211_build_probe_req(sdata, src, dst, ratemask, channel,
637 ssid, ssid_len,
638 ie, ie_len, flags);
639
640 if (skb) {
641 if (flags & IEEE80211_PROBE_FLAG_RANDOM_SN) {
642 struct ieee80211_hdr *hdr = (void *)skb->data;
643 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
644 u16 sn = get_random_u16();
645
646 info->control.flags |= IEEE80211_TX_CTRL_NO_SEQNO;
647 hdr->seq_ctrl =
648 cpu_to_le16(IEEE80211_SN_TO_SEQ(sn));
649 }
650 IEEE80211_SKB_CB(skb)->flags |= tx_flags;
651 IEEE80211_SKB_CB(skb)->control.flags |= IEEE80211_TX_CTRL_SCAN_TX;
652 ieee80211_tx_skb_tid_band(sdata, skb, 7, channel->band);
653 }
654}
655
656static void ieee80211_scan_state_send_probe(struct ieee80211_local *local,
657 unsigned long *next_delay)
658{
659 int i;
660 struct ieee80211_sub_if_data *sdata;
661 struct cfg80211_scan_request *scan_req;
662 enum nl80211_band band = local->hw.conf.chandef.chan->band;
663 u32 flags = 0, tx_flags;
664
665 scan_req = rcu_dereference_protected(local->scan_req,
666 lockdep_is_held(&local->hw.wiphy->mtx));
667
668 tx_flags = IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
669 if (scan_req->no_cck)
670 tx_flags |= IEEE80211_TX_CTL_NO_CCK_RATE;
671 if (scan_req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT)
672 flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT;
673 if (scan_req->flags & NL80211_SCAN_FLAG_RANDOM_SN)
674 flags |= IEEE80211_PROBE_FLAG_RANDOM_SN;
675
676 sdata = rcu_dereference_protected(local->scan_sdata,
677 lockdep_is_held(&local->hw.wiphy->mtx));
678
679 for (i = 0; i < scan_req->n_ssids; i++)
680 ieee80211_send_scan_probe_req(
681 sdata, local->scan_addr, scan_req->bssid,
682 scan_req->ssids[i].ssid, scan_req->ssids[i].ssid_len,
683 scan_req->ie, scan_req->ie_len,
684 scan_req->rates[band], flags,
685 tx_flags, local->hw.conf.chandef.chan);
686
687 /*
688 * After sending probe requests, wait for probe responses
689 * on the channel.
690 */
691 *next_delay = msecs_to_jiffies(scan_req->duration) >
692 IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME ?
693 msecs_to_jiffies(scan_req->duration) - IEEE80211_PROBE_DELAY :
694 IEEE80211_CHANNEL_TIME;
695 local->next_scan_state = SCAN_DECISION;
696}
697
698static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata,
699 struct cfg80211_scan_request *req)
700{
701 struct ieee80211_local *local = sdata->local;
702 bool hw_scan = local->ops->hw_scan;
703 int rc;
704
705 lockdep_assert_wiphy(local->hw.wiphy);
706
707 if (local->scan_req)
708 return -EBUSY;
709
710 /* For an MLO connection, if a link ID was specified, validate that it
711 * is indeed active.
712 */
713 if (ieee80211_vif_is_mld(&sdata->vif) && req->tsf_report_link_id >= 0 &&
714 !(sdata->vif.active_links & BIT(req->tsf_report_link_id)))
715 return -EINVAL;
716
717 if (!__ieee80211_can_leave_ch(sdata))
718 return -EBUSY;
719
720 if (!ieee80211_can_scan(local, sdata)) {
721 /* wait for the work to finish/time out */
722 rcu_assign_pointer(local->scan_req, req);
723 rcu_assign_pointer(local->scan_sdata, sdata);
724 return 0;
725 }
726
727 again:
728 if (hw_scan) {
729 u8 *ies;
730
731 local->hw_scan_ies_bufsize = local->scan_ies_len + req->ie_len;
732
733 if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) {
734 int i, n_bands = 0;
735 u8 bands_counted = 0;
736
737 for (i = 0; i < req->n_channels; i++) {
738 if (bands_counted & BIT(req->channels[i]->band))
739 continue;
740 bands_counted |= BIT(req->channels[i]->band);
741 n_bands++;
742 }
743
744 local->hw_scan_ies_bufsize *= n_bands;
745 }
746
747 local->hw_scan_req = kmalloc(
748 sizeof(*local->hw_scan_req) +
749 req->n_channels * sizeof(req->channels[0]) +
750 local->hw_scan_ies_bufsize, GFP_KERNEL);
751 if (!local->hw_scan_req)
752 return -ENOMEM;
753
754 local->hw_scan_req->req.ssids = req->ssids;
755 local->hw_scan_req->req.n_ssids = req->n_ssids;
756 ies = (u8 *)local->hw_scan_req +
757 sizeof(*local->hw_scan_req) +
758 req->n_channels * sizeof(req->channels[0]);
759 local->hw_scan_req->req.ie = ies;
760 local->hw_scan_req->req.flags = req->flags;
761 eth_broadcast_addr(local->hw_scan_req->req.bssid);
762 local->hw_scan_req->req.duration = req->duration;
763 local->hw_scan_req->req.duration_mandatory =
764 req->duration_mandatory;
765 local->hw_scan_req->req.tsf_report_link_id =
766 req->tsf_report_link_id;
767
768 local->hw_scan_band = 0;
769 local->hw_scan_req->req.n_6ghz_params = req->n_6ghz_params;
770 local->hw_scan_req->req.scan_6ghz_params =
771 req->scan_6ghz_params;
772 local->hw_scan_req->req.scan_6ghz = req->scan_6ghz;
773
774 /*
775 * After allocating local->hw_scan_req, we must
776 * go through until ieee80211_prep_hw_scan(), so
777 * anything that might be changed here and leave
778 * this function early must not go after this
779 * allocation.
780 */
781 }
782
783 rcu_assign_pointer(local->scan_req, req);
784 rcu_assign_pointer(local->scan_sdata, sdata);
785
786 if (req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR)
787 get_random_mask_addr(local->scan_addr,
788 req->mac_addr,
789 req->mac_addr_mask);
790 else
791 memcpy(local->scan_addr, sdata->vif.addr, ETH_ALEN);
792
793 if (hw_scan) {
794 __set_bit(SCAN_HW_SCANNING, &local->scanning);
795 } else if ((req->n_channels == 1) &&
796 (req->channels[0] == local->hw.conf.chandef.chan)) {
797 /*
798 * If we are scanning only on the operating channel
799 * then we do not need to stop normal activities
800 */
801 unsigned long next_delay;
802
803 __set_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
804
805 ieee80211_recalc_idle(local);
806
807 /* Notify driver scan is starting, keep order of operations
808 * same as normal software scan, in case that matters. */
809 drv_sw_scan_start(local, sdata, local->scan_addr);
810
811 ieee80211_configure_filter(local); /* accept probe-responses */
812
813 /* We need to ensure power level is at max for scanning. */
814 ieee80211_hw_conf_chan(local);
815
816 if ((req->channels[0]->flags & (IEEE80211_CHAN_NO_IR |
817 IEEE80211_CHAN_RADAR)) ||
818 !req->n_ssids) {
819 next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
820 if (req->n_ssids)
821 set_bit(SCAN_BEACON_WAIT, &local->scanning);
822 } else {
823 ieee80211_scan_state_send_probe(local, &next_delay);
824 next_delay = IEEE80211_CHANNEL_TIME;
825 }
826
827 /* Now, just wait a bit and we are all done! */
828 wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work,
829 next_delay);
830 return 0;
831 } else {
832 /* Do normal software scan */
833 __set_bit(SCAN_SW_SCANNING, &local->scanning);
834 }
835
836 ieee80211_recalc_idle(local);
837
838 if (hw_scan) {
839 WARN_ON(!ieee80211_prep_hw_scan(sdata));
840 rc = drv_hw_scan(local, sdata, local->hw_scan_req);
841 } else {
842 rc = ieee80211_start_sw_scan(local, sdata);
843 }
844
845 if (rc) {
846 kfree(local->hw_scan_req);
847 local->hw_scan_req = NULL;
848 local->scanning = 0;
849
850 ieee80211_recalc_idle(local);
851
852 local->scan_req = NULL;
853 RCU_INIT_POINTER(local->scan_sdata, NULL);
854 }
855
856 if (hw_scan && rc == 1) {
857 /*
858 * we can't fall back to software for P2P-GO
859 * as it must update NoA etc.
860 */
861 if (ieee80211_vif_type_p2p(&sdata->vif) ==
862 NL80211_IFTYPE_P2P_GO)
863 return -EOPNOTSUPP;
864 hw_scan = false;
865 goto again;
866 }
867
868 return rc;
869}
870
871static unsigned long
872ieee80211_scan_get_channel_time(struct ieee80211_channel *chan)
873{
874 /*
875 * TODO: channel switching also consumes quite some time,
876 * add that delay as well to get a better estimation
877 */
878 if (chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR))
879 return IEEE80211_PASSIVE_CHANNEL_TIME;
880 return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME;
881}
882
883static void ieee80211_scan_state_decision(struct ieee80211_local *local,
884 unsigned long *next_delay)
885{
886 bool associated = false;
887 bool tx_empty = true;
888 bool bad_latency;
889 struct ieee80211_sub_if_data *sdata;
890 struct ieee80211_channel *next_chan;
891 enum mac80211_scan_state next_scan_state;
892 struct cfg80211_scan_request *scan_req;
893
894 lockdep_assert_wiphy(local->hw.wiphy);
895
896 /*
897 * check if at least one STA interface is associated,
898 * check if at least one STA interface has pending tx frames
899 * and grab the lowest used beacon interval
900 */
901 list_for_each_entry(sdata, &local->interfaces, list) {
902 if (!ieee80211_sdata_running(sdata))
903 continue;
904
905 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
906 if (sdata->u.mgd.associated) {
907 associated = true;
908
909 if (!qdisc_all_tx_empty(sdata->dev)) {
910 tx_empty = false;
911 break;
912 }
913 }
914 }
915 }
916
917 scan_req = rcu_dereference_protected(local->scan_req,
918 lockdep_is_held(&local->hw.wiphy->mtx));
919
920 next_chan = scan_req->channels[local->scan_channel_idx];
921
922 /*
923 * we're currently scanning a different channel, let's
924 * see if we can scan another channel without interfering
925 * with the current traffic situation.
926 *
927 * Keep good latency, do not stay off-channel more than 125 ms.
928 */
929
930 bad_latency = time_after(jiffies +
931 ieee80211_scan_get_channel_time(next_chan),
932 local->leave_oper_channel_time + HZ / 8);
933
934 if (associated && !tx_empty) {
935 if (scan_req->flags & NL80211_SCAN_FLAG_LOW_PRIORITY)
936 next_scan_state = SCAN_ABORT;
937 else
938 next_scan_state = SCAN_SUSPEND;
939 } else if (associated && bad_latency) {
940 next_scan_state = SCAN_SUSPEND;
941 } else {
942 next_scan_state = SCAN_SET_CHANNEL;
943 }
944
945 local->next_scan_state = next_scan_state;
946
947 *next_delay = 0;
948}
949
950static void ieee80211_scan_state_set_channel(struct ieee80211_local *local,
951 unsigned long *next_delay)
952{
953 int skip;
954 struct ieee80211_channel *chan;
955 struct cfg80211_scan_request *scan_req;
956
957 scan_req = rcu_dereference_protected(local->scan_req,
958 lockdep_is_held(&local->hw.wiphy->mtx));
959
960 skip = 0;
961 chan = scan_req->channels[local->scan_channel_idx];
962
963 local->scan_chandef.chan = chan;
964 local->scan_chandef.center_freq1 = chan->center_freq;
965 local->scan_chandef.freq1_offset = chan->freq_offset;
966 local->scan_chandef.center_freq2 = 0;
967
968 /* For scanning on the S1G band, detect the channel width according to
969 * the channel being scanned.
970 */
971 if (chan->band == NL80211_BAND_S1GHZ) {
972 local->scan_chandef.width = ieee80211_s1g_channel_width(chan);
973 goto set_channel;
974 }
975
976 /* If scanning on oper channel, use whatever channel-type
977 * is currently in use.
978 */
979 if (chan == local->hw.conf.chandef.chan)
980 local->scan_chandef = local->hw.conf.chandef;
981 else
982 local->scan_chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
983
984set_channel:
985 if (ieee80211_hw_conf_chan(local))
986 skip = 1;
987
988 /* advance state machine to next channel/band */
989 local->scan_channel_idx++;
990
991 if (skip) {
992 /* if we skip this channel return to the decision state */
993 local->next_scan_state = SCAN_DECISION;
994 return;
995 }
996
997 /*
998 * Probe delay is used to update the NAV, cf. 11.1.3.2.2
999 * (which unfortunately doesn't say _why_ step a) is done,
1000 * but it waits for the probe delay or until a frame is
1001 * received - and the received frame would update the NAV).
1002 * For now, we do not support waiting until a frame is
1003 * received.
1004 *
1005 * In any case, it is not necessary for a passive scan.
1006 */
1007 if ((chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR)) ||
1008 !scan_req->n_ssids) {
1009 *next_delay = msecs_to_jiffies(scan_req->duration) >
1010 IEEE80211_PASSIVE_CHANNEL_TIME ?
1011 msecs_to_jiffies(scan_req->duration) :
1012 IEEE80211_PASSIVE_CHANNEL_TIME;
1013 local->next_scan_state = SCAN_DECISION;
1014 if (scan_req->n_ssids)
1015 set_bit(SCAN_BEACON_WAIT, &local->scanning);
1016 return;
1017 }
1018
1019 /* active scan, send probes */
1020 *next_delay = IEEE80211_PROBE_DELAY;
1021 local->next_scan_state = SCAN_SEND_PROBE;
1022}
1023
1024static void ieee80211_scan_state_suspend(struct ieee80211_local *local,
1025 unsigned long *next_delay)
1026{
1027 /* switch back to the operating channel */
1028 local->scan_chandef.chan = NULL;
1029 ieee80211_hw_conf_chan(local);
1030
1031 /* disable PS */
1032 ieee80211_offchannel_return(local);
1033
1034 *next_delay = HZ / 5;
1035 /* afterwards, resume scan & go to next channel */
1036 local->next_scan_state = SCAN_RESUME;
1037}
1038
1039static void ieee80211_scan_state_resume(struct ieee80211_local *local,
1040 unsigned long *next_delay)
1041{
1042 ieee80211_offchannel_stop_vifs(local);
1043
1044 if (local->ops->flush) {
1045 ieee80211_flush_queues(local, NULL, false);
1046 *next_delay = 0;
1047 } else
1048 *next_delay = HZ / 10;
1049
1050 /* remember when we left the operating channel */
1051 local->leave_oper_channel_time = jiffies;
1052
1053 /* advance to the next channel to be scanned */
1054 local->next_scan_state = SCAN_SET_CHANNEL;
1055}
1056
1057void ieee80211_scan_work(struct wiphy *wiphy, struct wiphy_work *work)
1058{
1059 struct ieee80211_local *local =
1060 container_of(work, struct ieee80211_local, scan_work.work);
1061 struct ieee80211_sub_if_data *sdata;
1062 struct cfg80211_scan_request *scan_req;
1063 unsigned long next_delay = 0;
1064 bool aborted;
1065
1066 lockdep_assert_wiphy(local->hw.wiphy);
1067
1068 if (!ieee80211_can_run_worker(local)) {
1069 aborted = true;
1070 goto out_complete;
1071 }
1072
1073 sdata = rcu_dereference_protected(local->scan_sdata,
1074 lockdep_is_held(&local->hw.wiphy->mtx));
1075 scan_req = rcu_dereference_protected(local->scan_req,
1076 lockdep_is_held(&local->hw.wiphy->mtx));
1077
1078 /* When scanning on-channel, the first-callback means completed. */
1079 if (test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning)) {
1080 aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning);
1081 goto out_complete;
1082 }
1083
1084 if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) {
1085 aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning);
1086 goto out_complete;
1087 }
1088
1089 if (!sdata || !scan_req)
1090 return;
1091
1092 if (!local->scanning) {
1093 int rc;
1094
1095 RCU_INIT_POINTER(local->scan_req, NULL);
1096 RCU_INIT_POINTER(local->scan_sdata, NULL);
1097
1098 rc = __ieee80211_start_scan(sdata, scan_req);
1099 if (!rc)
1100 return;
1101 /* need to complete scan in cfg80211 */
1102 rcu_assign_pointer(local->scan_req, scan_req);
1103 aborted = true;
1104 goto out_complete;
1105 }
1106
1107 clear_bit(SCAN_BEACON_WAIT, &local->scanning);
1108
1109 /*
1110 * as long as no delay is required advance immediately
1111 * without scheduling a new work
1112 */
1113 do {
1114 if (!ieee80211_sdata_running(sdata)) {
1115 aborted = true;
1116 goto out_complete;
1117 }
1118
1119 if (test_and_clear_bit(SCAN_BEACON_DONE, &local->scanning) &&
1120 local->next_scan_state == SCAN_DECISION)
1121 local->next_scan_state = SCAN_SEND_PROBE;
1122
1123 switch (local->next_scan_state) {
1124 case SCAN_DECISION:
1125 /* if no more bands/channels left, complete scan */
1126 if (local->scan_channel_idx >= scan_req->n_channels) {
1127 aborted = false;
1128 goto out_complete;
1129 }
1130 ieee80211_scan_state_decision(local, &next_delay);
1131 break;
1132 case SCAN_SET_CHANNEL:
1133 ieee80211_scan_state_set_channel(local, &next_delay);
1134 break;
1135 case SCAN_SEND_PROBE:
1136 ieee80211_scan_state_send_probe(local, &next_delay);
1137 break;
1138 case SCAN_SUSPEND:
1139 ieee80211_scan_state_suspend(local, &next_delay);
1140 break;
1141 case SCAN_RESUME:
1142 ieee80211_scan_state_resume(local, &next_delay);
1143 break;
1144 case SCAN_ABORT:
1145 aborted = true;
1146 goto out_complete;
1147 }
1148 } while (next_delay == 0);
1149
1150 wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work,
1151 next_delay);
1152 return;
1153
1154out_complete:
1155 __ieee80211_scan_completed(&local->hw, aborted);
1156}
1157
1158int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata,
1159 struct cfg80211_scan_request *req)
1160{
1161 lockdep_assert_wiphy(sdata->local->hw.wiphy);
1162
1163 return __ieee80211_start_scan(sdata, req);
1164}
1165
1166int ieee80211_request_ibss_scan(struct ieee80211_sub_if_data *sdata,
1167 const u8 *ssid, u8 ssid_len,
1168 struct ieee80211_channel **channels,
1169 unsigned int n_channels)
1170{
1171 struct ieee80211_local *local = sdata->local;
1172 int ret = -EBUSY, i, n_ch = 0;
1173 enum nl80211_band band;
1174
1175 lockdep_assert_wiphy(local->hw.wiphy);
1176
1177 /* busy scanning */
1178 if (local->scan_req)
1179 goto unlock;
1180
1181 /* fill internal scan request */
1182 if (!channels) {
1183 int max_n;
1184
1185 for (band = 0; band < NUM_NL80211_BANDS; band++) {
1186 if (!local->hw.wiphy->bands[band] ||
1187 band == NL80211_BAND_6GHZ)
1188 continue;
1189
1190 max_n = local->hw.wiphy->bands[band]->n_channels;
1191 for (i = 0; i < max_n; i++) {
1192 struct ieee80211_channel *tmp_ch =
1193 &local->hw.wiphy->bands[band]->channels[i];
1194
1195 if (tmp_ch->flags & (IEEE80211_CHAN_NO_IR |
1196 IEEE80211_CHAN_DISABLED))
1197 continue;
1198
1199 local->int_scan_req->channels[n_ch] = tmp_ch;
1200 n_ch++;
1201 }
1202 }
1203
1204 if (WARN_ON_ONCE(n_ch == 0))
1205 goto unlock;
1206
1207 local->int_scan_req->n_channels = n_ch;
1208 } else {
1209 for (i = 0; i < n_channels; i++) {
1210 if (channels[i]->flags & (IEEE80211_CHAN_NO_IR |
1211 IEEE80211_CHAN_DISABLED))
1212 continue;
1213
1214 local->int_scan_req->channels[n_ch] = channels[i];
1215 n_ch++;
1216 }
1217
1218 if (WARN_ON_ONCE(n_ch == 0))
1219 goto unlock;
1220
1221 local->int_scan_req->n_channels = n_ch;
1222 }
1223
1224 local->int_scan_req->ssids = &local->scan_ssid;
1225 local->int_scan_req->n_ssids = 1;
1226 memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN);
1227 local->int_scan_req->ssids[0].ssid_len = ssid_len;
1228
1229 ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req);
1230 unlock:
1231 return ret;
1232}
1233
1234void ieee80211_scan_cancel(struct ieee80211_local *local)
1235{
1236 /* ensure a new scan cannot be queued */
1237 lockdep_assert_wiphy(local->hw.wiphy);
1238
1239 /*
1240 * We are canceling software scan, or deferred scan that was not
1241 * yet really started (see __ieee80211_start_scan ).
1242 *
1243 * Regarding hardware scan:
1244 * - we can not call __ieee80211_scan_completed() as when
1245 * SCAN_HW_SCANNING bit is set this function change
1246 * local->hw_scan_req to operate on 5G band, what race with
1247 * driver which can use local->hw_scan_req
1248 *
1249 * - we can not cancel scan_work since driver can schedule it
1250 * by ieee80211_scan_completed(..., true) to finish scan
1251 *
1252 * Hence we only call the cancel_hw_scan() callback, but the low-level
1253 * driver is still responsible for calling ieee80211_scan_completed()
1254 * after the scan was completed/aborted.
1255 */
1256
1257 if (!local->scan_req)
1258 return;
1259
1260 /*
1261 * We have a scan running and the driver already reported completion,
1262 * but the worker hasn't run yet or is stuck on the mutex - mark it as
1263 * cancelled.
1264 */
1265 if (test_bit(SCAN_HW_SCANNING, &local->scanning) &&
1266 test_bit(SCAN_COMPLETED, &local->scanning)) {
1267 set_bit(SCAN_HW_CANCELLED, &local->scanning);
1268 return;
1269 }
1270
1271 if (test_bit(SCAN_HW_SCANNING, &local->scanning)) {
1272 /*
1273 * Make sure that __ieee80211_scan_completed doesn't trigger a
1274 * scan on another band.
1275 */
1276 set_bit(SCAN_HW_CANCELLED, &local->scanning);
1277 if (local->ops->cancel_hw_scan)
1278 drv_cancel_hw_scan(local,
1279 rcu_dereference_protected(local->scan_sdata,
1280 lockdep_is_held(&local->hw.wiphy->mtx)));
1281 return;
1282 }
1283
1284 wiphy_delayed_work_cancel(local->hw.wiphy, &local->scan_work);
1285 /* and clean up */
1286 memset(&local->scan_info, 0, sizeof(local->scan_info));
1287 __ieee80211_scan_completed(&local->hw, true);
1288}
1289
1290int __ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata,
1291 struct cfg80211_sched_scan_request *req)
1292{
1293 struct ieee80211_local *local = sdata->local;
1294 struct ieee80211_scan_ies sched_scan_ies = {};
1295 struct cfg80211_chan_def chandef;
1296 int ret, i, iebufsz, num_bands = 0;
1297 u32 rate_masks[NUM_NL80211_BANDS] = {};
1298 u8 bands_used = 0;
1299 u8 *ie;
1300 u32 flags = 0;
1301
1302 lockdep_assert_wiphy(local->hw.wiphy);
1303
1304 iebufsz = local->scan_ies_len + req->ie_len;
1305
1306 if (!local->ops->sched_scan_start)
1307 return -EOPNOTSUPP;
1308
1309 for (i = 0; i < NUM_NL80211_BANDS; i++) {
1310 if (local->hw.wiphy->bands[i]) {
1311 bands_used |= BIT(i);
1312 rate_masks[i] = (u32) -1;
1313 num_bands++;
1314 }
1315 }
1316
1317 if (req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT)
1318 flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT;
1319
1320 ie = kcalloc(iebufsz, num_bands, GFP_KERNEL);
1321 if (!ie) {
1322 ret = -ENOMEM;
1323 goto out;
1324 }
1325
1326 ieee80211_prepare_scan_chandef(&chandef);
1327
1328 ret = ieee80211_build_preq_ies(sdata, ie, num_bands * iebufsz,
1329 &sched_scan_ies, req->ie,
1330 req->ie_len, bands_used, rate_masks,
1331 &chandef, flags);
1332 if (ret < 0)
1333 goto error;
1334
1335 ret = drv_sched_scan_start(local, sdata, req, &sched_scan_ies);
1336 if (ret == 0) {
1337 rcu_assign_pointer(local->sched_scan_sdata, sdata);
1338 rcu_assign_pointer(local->sched_scan_req, req);
1339 }
1340
1341error:
1342 kfree(ie);
1343out:
1344 if (ret) {
1345 /* Clean in case of failure after HW restart or upon resume. */
1346 RCU_INIT_POINTER(local->sched_scan_sdata, NULL);
1347 RCU_INIT_POINTER(local->sched_scan_req, NULL);
1348 }
1349
1350 return ret;
1351}
1352
1353int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata,
1354 struct cfg80211_sched_scan_request *req)
1355{
1356 struct ieee80211_local *local = sdata->local;
1357
1358 lockdep_assert_wiphy(local->hw.wiphy);
1359
1360 if (rcu_access_pointer(local->sched_scan_sdata))
1361 return -EBUSY;
1362
1363 return __ieee80211_request_sched_scan_start(sdata, req);
1364}
1365
1366int ieee80211_request_sched_scan_stop(struct ieee80211_local *local)
1367{
1368 struct ieee80211_sub_if_data *sched_scan_sdata;
1369 int ret = -ENOENT;
1370
1371 lockdep_assert_wiphy(local->hw.wiphy);
1372
1373 if (!local->ops->sched_scan_stop)
1374 return -EOPNOTSUPP;
1375
1376 /* We don't want to restart sched scan anymore. */
1377 RCU_INIT_POINTER(local->sched_scan_req, NULL);
1378
1379 sched_scan_sdata = rcu_dereference_protected(local->sched_scan_sdata,
1380 lockdep_is_held(&local->hw.wiphy->mtx));
1381 if (sched_scan_sdata) {
1382 ret = drv_sched_scan_stop(local, sched_scan_sdata);
1383 if (!ret)
1384 RCU_INIT_POINTER(local->sched_scan_sdata, NULL);
1385 }
1386
1387 return ret;
1388}
1389
1390void ieee80211_sched_scan_results(struct ieee80211_hw *hw)
1391{
1392 struct ieee80211_local *local = hw_to_local(hw);
1393
1394 trace_api_sched_scan_results(local);
1395
1396 cfg80211_sched_scan_results(hw->wiphy, 0);
1397}
1398EXPORT_SYMBOL(ieee80211_sched_scan_results);
1399
1400void ieee80211_sched_scan_end(struct ieee80211_local *local)
1401{
1402 lockdep_assert_wiphy(local->hw.wiphy);
1403
1404 if (!rcu_access_pointer(local->sched_scan_sdata))
1405 return;
1406
1407 RCU_INIT_POINTER(local->sched_scan_sdata, NULL);
1408
1409 /* If sched scan was aborted by the driver. */
1410 RCU_INIT_POINTER(local->sched_scan_req, NULL);
1411
1412 cfg80211_sched_scan_stopped_locked(local->hw.wiphy, 0);
1413}
1414
1415void ieee80211_sched_scan_stopped_work(struct wiphy *wiphy,
1416 struct wiphy_work *work)
1417{
1418 struct ieee80211_local *local =
1419 container_of(work, struct ieee80211_local,
1420 sched_scan_stopped_work);
1421
1422 ieee80211_sched_scan_end(local);
1423}
1424
1425void ieee80211_sched_scan_stopped(struct ieee80211_hw *hw)
1426{
1427 struct ieee80211_local *local = hw_to_local(hw);
1428
1429 trace_api_sched_scan_stopped(local);
1430
1431 /*
1432 * this shouldn't really happen, so for simplicity
1433 * simply ignore it, and let mac80211 reconfigure
1434 * the sched scan later on.
1435 */
1436 if (local->in_reconfig)
1437 return;
1438
1439 wiphy_work_queue(hw->wiphy, &local->sched_scan_stopped_work);
1440}
1441EXPORT_SYMBOL(ieee80211_sched_scan_stopped);