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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Scanning implementation
4 *
5 * Copyright 2003, Jouni Malinen <[email protected]>
6 * Copyright 2004, Instant802 Networks, Inc.
7 * Copyright 2005, Devicescape Software, Inc.
8 * Copyright 2006-2007 Jiri Benc <[email protected]>
9 * Copyright 2007, Michael Wu <[email protected]>
10 * Copyright 2013-2015 Intel Mobile Communications GmbH
11 * Copyright 2016-2017 Intel Deutschland GmbH
12 * Copyright (C) 2018-2025 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,
80 update_data->beacon ?
81 IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_BEACON :
82 IEEE80211_FTYPE_MGMT | IEEE80211_STYPE_PROBE_RESP,
83 NULL);
84 if (!elems)
85 return;
86
87 rx_status = update_data->rx_status;
88
89 if (update_data->beacon)
90 bss->device_ts_beacon = rx_status->device_timestamp;
91 else
92 bss->device_ts_presp = rx_status->device_timestamp;
93
94 if (elems->parse_error) {
95 if (update_data->beacon)
96 bss->corrupt_data |= IEEE80211_BSS_CORRUPT_BEACON;
97 else
98 bss->corrupt_data |= IEEE80211_BSS_CORRUPT_PROBE_RESP;
99 } else {
100 if (update_data->beacon)
101 bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_BEACON;
102 else
103 bss->corrupt_data &= ~IEEE80211_BSS_CORRUPT_PROBE_RESP;
104 }
105
106 /* save the ERP value so that it is available at association time */
107 if (elems->erp_info && (!elems->parse_error ||
108 !(bss->valid_data & IEEE80211_BSS_VALID_ERP))) {
109 bss->erp_value = elems->erp_info[0];
110 bss->has_erp_value = true;
111 if (!elems->parse_error)
112 bss->valid_data |= IEEE80211_BSS_VALID_ERP;
113 }
114
115 /* replace old supported rates if we get new values */
116 if (!elems->parse_error ||
117 !(bss->valid_data & IEEE80211_BSS_VALID_RATES)) {
118 srlen = 0;
119 if (elems->supp_rates) {
120 clen = IEEE80211_MAX_SUPP_RATES;
121 if (clen > elems->supp_rates_len)
122 clen = elems->supp_rates_len;
123 memcpy(bss->supp_rates, elems->supp_rates, clen);
124 srlen += clen;
125 }
126 if (elems->ext_supp_rates) {
127 clen = IEEE80211_MAX_SUPP_RATES - srlen;
128 if (clen > elems->ext_supp_rates_len)
129 clen = elems->ext_supp_rates_len;
130 memcpy(bss->supp_rates + srlen, elems->ext_supp_rates,
131 clen);
132 srlen += clen;
133 }
134 if (srlen) {
135 bss->supp_rates_len = srlen;
136 if (!elems->parse_error)
137 bss->valid_data |= IEEE80211_BSS_VALID_RATES;
138 }
139 }
140
141 if (!elems->parse_error ||
142 !(bss->valid_data & IEEE80211_BSS_VALID_WMM)) {
143 bss->wmm_used = elems->wmm_param || elems->wmm_info;
144 bss->uapsd_supported = is_uapsd_supported(elems);
145 if (!elems->parse_error)
146 bss->valid_data |= IEEE80211_BSS_VALID_WMM;
147 }
148
149 if (update_data->beacon) {
150 struct ieee80211_supported_band *sband =
151 local->hw.wiphy->bands[rx_status->band];
152 if (!(rx_status->encoding == RX_ENC_HT) &&
153 !(rx_status->encoding == RX_ENC_VHT))
154 bss->beacon_rate =
155 &sband->bitrates[rx_status->rate_idx];
156 }
157
158 if (elems->vht_cap_elem)
159 bss->vht_cap_info =
160 le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
161 else
162 bss->vht_cap_info = 0;
163
164 kfree(elems);
165}
166
167struct ieee80211_bss *
168ieee80211_bss_info_update(struct ieee80211_local *local,
169 struct ieee80211_rx_status *rx_status,
170 struct ieee80211_mgmt *mgmt, size_t len,
171 struct ieee80211_channel *channel)
172{
173 bool beacon = ieee80211_is_beacon(mgmt->frame_control) ||
174 ieee80211_is_s1g_beacon(mgmt->frame_control);
175 struct cfg80211_bss *cbss;
176 struct inform_bss_update_data update_data = {
177 .rx_status = rx_status,
178 .beacon = beacon,
179 };
180 struct cfg80211_inform_bss bss_meta = {
181 .boottime_ns = rx_status->boottime_ns,
182 .drv_data = (void *)&update_data,
183 };
184 bool signal_valid;
185 struct ieee80211_sub_if_data *scan_sdata;
186
187 if (rx_status->flag & RX_FLAG_NO_SIGNAL_VAL)
188 bss_meta.signal = 0; /* invalid signal indication */
189 else if (ieee80211_hw_check(&local->hw, SIGNAL_DBM))
190 bss_meta.signal = rx_status->signal * 100;
191 else if (ieee80211_hw_check(&local->hw, SIGNAL_UNSPEC))
192 bss_meta.signal = (rx_status->signal * 100) / local->hw.max_signal;
193
194 bss_meta.chan = channel;
195
196 rcu_read_lock();
197 scan_sdata = rcu_dereference(local->scan_sdata);
198 if (scan_sdata && scan_sdata->vif.type == NL80211_IFTYPE_STATION &&
199 scan_sdata->vif.cfg.assoc &&
200 ieee80211_have_rx_timestamp(rx_status)) {
201 struct ieee80211_bss_conf *link_conf = NULL;
202
203 /* for an MLO connection, set the TSF data only in case we have
204 * an indication on which of the links the frame was received
205 */
206 if (ieee80211_vif_is_mld(&scan_sdata->vif)) {
207 if (rx_status->link_valid) {
208 s8 link_id = rx_status->link_id;
209
210 link_conf =
211 rcu_dereference(scan_sdata->vif.link_conf[link_id]);
212 }
213 } else {
214 link_conf = &scan_sdata->vif.bss_conf;
215 }
216
217 if (link_conf) {
218 bss_meta.parent_tsf =
219 ieee80211_calculate_rx_timestamp(&local->hw,
220 rx_status,
221 len + FCS_LEN,
222 24);
223
224 ether_addr_copy(bss_meta.parent_bssid,
225 link_conf->bssid);
226 }
227 }
228 rcu_read_unlock();
229
230 cbss = cfg80211_inform_bss_frame_data(local->hw.wiphy, &bss_meta,
231 mgmt, len, GFP_ATOMIC);
232 if (!cbss)
233 return NULL;
234
235 /* In case the signal is invalid update the status */
236 signal_valid = channel == cbss->channel;
237 if (!signal_valid)
238 rx_status->flag |= RX_FLAG_NO_SIGNAL_VAL;
239
240 return (void *)cbss->priv;
241}
242
243static bool ieee80211_scan_accept_presp(struct ieee80211_sub_if_data *sdata,
244 struct ieee80211_channel *channel,
245 u32 scan_flags, const u8 *da)
246{
247 struct ieee80211_link_data *link_sdata;
248 u8 link_id;
249
250 if (!sdata)
251 return false;
252
253 /* accept broadcast on 6 GHz and for OCE */
254 if (is_broadcast_ether_addr(da) &&
255 (channel->band == NL80211_BAND_6GHZ ||
256 scan_flags & NL80211_SCAN_FLAG_ACCEPT_BCAST_PROBE_RESP))
257 return true;
258
259 if (scan_flags & NL80211_SCAN_FLAG_RANDOM_ADDR)
260 return true;
261
262 if (ether_addr_equal(da, sdata->vif.addr))
263 return true;
264
265 for (link_id = 0; link_id < IEEE80211_MLD_MAX_NUM_LINKS; link_id++) {
266 link_sdata = rcu_dereference(sdata->link[link_id]);
267 if (!link_sdata)
268 continue;
269
270 if (ether_addr_equal(da, link_sdata->conf->addr))
271 return true;
272 }
273
274 return false;
275}
276
277void ieee80211_scan_rx(struct ieee80211_local *local, struct sk_buff *skb)
278{
279 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
280 struct ieee80211_mgmt *mgmt = (void *)skb->data;
281 struct ieee80211_bss *bss;
282 struct ieee80211_channel *channel;
283 struct ieee80211_ext *ext;
284 size_t min_hdr_len = offsetof(struct ieee80211_mgmt,
285 u.probe_resp.variable);
286
287 if (!ieee80211_is_probe_resp(mgmt->frame_control) &&
288 !ieee80211_is_beacon(mgmt->frame_control) &&
289 !ieee80211_is_s1g_beacon(mgmt->frame_control))
290 return;
291
292 if (ieee80211_is_s1g_beacon(mgmt->frame_control)) {
293 ext = (struct ieee80211_ext *)mgmt;
294 min_hdr_len =
295 offsetof(struct ieee80211_ext, u.s1g_beacon.variable) +
296 ieee80211_s1g_optional_len(ext->frame_control);
297 }
298
299 if (skb->len < min_hdr_len)
300 return;
301
302 if (test_and_clear_bit(SCAN_BEACON_WAIT, &local->scanning)) {
303 /*
304 * we were passive scanning because of radar/no-IR, but
305 * the beacon/proberesp rx gives us an opportunity to upgrade
306 * to active scan
307 */
308 set_bit(SCAN_BEACON_DONE, &local->scanning);
309 wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work, 0);
310 }
311
312 channel = ieee80211_get_channel_khz(local->hw.wiphy,
313 ieee80211_rx_status_to_khz(rx_status));
314
315 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
316 return;
317
318 if (ieee80211_is_probe_resp(mgmt->frame_control)) {
319 struct ieee80211_sub_if_data *sdata1, *sdata2;
320 struct cfg80211_scan_request *scan_req;
321 struct cfg80211_sched_scan_request *sched_scan_req;
322 u32 scan_req_flags = 0, sched_scan_req_flags = 0;
323
324 sdata1 = rcu_dereference(local->scan_sdata);
325 sdata2 = rcu_dereference(local->sched_scan_sdata);
326
327 if (likely(!sdata1 && !sdata2))
328 return;
329
330 scan_req = rcu_dereference(local->scan_req);
331 sched_scan_req = rcu_dereference(local->sched_scan_req);
332
333 if (scan_req)
334 scan_req_flags = scan_req->flags;
335
336 if (sched_scan_req)
337 sched_scan_req_flags = sched_scan_req->flags;
338
339 /* ignore ProbeResp to foreign address or non-bcast (OCE)
340 * unless scanning with randomised address
341 */
342 if (!ieee80211_scan_accept_presp(sdata1, channel,
343 scan_req_flags,
344 mgmt->da) &&
345 !ieee80211_scan_accept_presp(sdata2, channel,
346 sched_scan_req_flags,
347 mgmt->da))
348 return;
349 } else {
350 /*
351 * Non-S1G beacons are expected only with broadcast address.
352 * S1G beacons only carry the SA so no DA check is required
353 * nor possible.
354 */
355 if (!ieee80211_is_s1g_beacon(mgmt->frame_control) &&
356 !is_broadcast_ether_addr(mgmt->da))
357 return;
358 }
359
360 /* Do not update the BSS table in case of only monitor interfaces */
361 if (local->open_count == local->monitors)
362 return;
363
364 bss = ieee80211_bss_info_update(local, rx_status,
365 mgmt, skb->len,
366 channel);
367 if (bss)
368 ieee80211_rx_bss_put(local, bss);
369}
370
371static void ieee80211_prepare_scan_chandef(struct cfg80211_chan_def *chandef)
372{
373 memset(chandef, 0, sizeof(*chandef));
374
375 chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
376}
377
378/* return false if no more work */
379static bool ieee80211_prep_hw_scan(struct ieee80211_sub_if_data *sdata)
380{
381 struct ieee80211_local *local = sdata->local;
382 struct cfg80211_scan_request *req;
383 struct cfg80211_chan_def chandef;
384 u8 bands_used = 0;
385 int i, ielen;
386 u32 *n_chans;
387 u32 flags = 0;
388
389 req = rcu_dereference_protected(local->scan_req,
390 lockdep_is_held(&local->hw.wiphy->mtx));
391
392 if (test_bit(SCAN_HW_CANCELLED, &local->scanning))
393 return false;
394
395 if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) {
396 local->hw_scan_req->req.n_channels = req->n_channels;
397
398 for (i = 0; i < req->n_channels; i++) {
399 local->hw_scan_req->req.channels[i] = req->channels[i];
400 bands_used |= BIT(req->channels[i]->band);
401 }
402 } else {
403 do {
404 if (local->hw_scan_band == NUM_NL80211_BANDS)
405 return false;
406
407 n_chans = &local->hw_scan_req->req.n_channels;
408 *n_chans = 0;
409
410 for (i = 0; i < req->n_channels; i++) {
411 if (req->channels[i]->band !=
412 local->hw_scan_band)
413 continue;
414 local->hw_scan_req->req.channels[(*n_chans)++] =
415 req->channels[i];
416
417 bands_used |= BIT(req->channels[i]->band);
418 }
419
420 local->hw_scan_band++;
421 } while (!*n_chans);
422 }
423
424 ieee80211_prepare_scan_chandef(&chandef);
425
426 if (req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT)
427 flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT;
428
429 ielen = ieee80211_build_preq_ies(sdata,
430 (u8 *)local->hw_scan_req->req.ie,
431 local->hw_scan_ies_bufsize,
432 &local->hw_scan_req->ies,
433 req->ie, req->ie_len,
434 bands_used, req->rates, &chandef,
435 flags);
436 if (ielen < 0)
437 return false;
438 local->hw_scan_req->req.ie_len = ielen;
439 local->hw_scan_req->req.no_cck = req->no_cck;
440 ether_addr_copy(local->hw_scan_req->req.mac_addr, req->mac_addr);
441 ether_addr_copy(local->hw_scan_req->req.mac_addr_mask,
442 req->mac_addr_mask);
443 ether_addr_copy(local->hw_scan_req->req.bssid, req->bssid);
444
445 return true;
446}
447
448static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted)
449{
450 struct ieee80211_local *local = hw_to_local(hw);
451 bool hw_scan = test_bit(SCAN_HW_SCANNING, &local->scanning);
452 bool was_scanning = local->scanning;
453 struct cfg80211_scan_request *scan_req;
454 struct ieee80211_sub_if_data *scan_sdata;
455 struct ieee80211_sub_if_data *sdata;
456
457 lockdep_assert_wiphy(local->hw.wiphy);
458
459 /*
460 * It's ok to abort a not-yet-running scan (that
461 * we have one at all will be verified by checking
462 * local->scan_req next), but not to complete it
463 * successfully.
464 */
465 if (WARN_ON(!local->scanning && !aborted))
466 aborted = true;
467
468 if (WARN_ON(!local->scan_req))
469 return;
470
471 scan_sdata = rcu_dereference_protected(local->scan_sdata,
472 lockdep_is_held(&local->hw.wiphy->mtx));
473
474 if (hw_scan && !aborted &&
475 !ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS) &&
476 ieee80211_prep_hw_scan(scan_sdata)) {
477 int rc;
478
479 rc = drv_hw_scan(local,
480 rcu_dereference_protected(local->scan_sdata,
481 lockdep_is_held(&local->hw.wiphy->mtx)),
482 local->hw_scan_req);
483
484 if (rc == 0)
485 return;
486
487 /* HW scan failed and is going to be reported as aborted,
488 * so clear old scan info.
489 */
490 memset(&local->scan_info, 0, sizeof(local->scan_info));
491 aborted = true;
492 }
493
494 kfree(local->hw_scan_req);
495 local->hw_scan_req = NULL;
496
497 scan_req = rcu_dereference_protected(local->scan_req,
498 lockdep_is_held(&local->hw.wiphy->mtx));
499
500 RCU_INIT_POINTER(local->scan_req, NULL);
501 RCU_INIT_POINTER(local->scan_sdata, NULL);
502
503 local->scanning = 0;
504 local->scan_chandef.chan = NULL;
505
506 synchronize_rcu();
507
508 if (scan_req != local->int_scan_req) {
509 local->scan_info.aborted = aborted;
510 cfg80211_scan_done(scan_req, &local->scan_info);
511 }
512
513 /* Set power back to normal operating levels. */
514 ieee80211_hw_conf_chan(local);
515
516 if (!hw_scan && was_scanning) {
517 ieee80211_configure_filter(local);
518 drv_sw_scan_complete(local, scan_sdata);
519 ieee80211_offchannel_return(local);
520 }
521
522 ieee80211_recalc_idle(local);
523
524 ieee80211_mlme_notify_scan_completed(local);
525 ieee80211_ibss_notify_scan_completed(local);
526
527 /* Requeue all the work that might have been ignored while
528 * the scan was in progress; if there was none this will
529 * just be a no-op for the particular interface.
530 */
531 list_for_each_entry(sdata, &local->interfaces, list) {
532 if (ieee80211_sdata_running(sdata))
533 wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work);
534 }
535
536 if (was_scanning)
537 ieee80211_start_next_roc(local);
538}
539
540void ieee80211_scan_completed(struct ieee80211_hw *hw,
541 struct cfg80211_scan_info *info)
542{
543 struct ieee80211_local *local = hw_to_local(hw);
544
545 trace_api_scan_completed(local, info->aborted);
546
547 set_bit(SCAN_COMPLETED, &local->scanning);
548 if (info->aborted)
549 set_bit(SCAN_ABORTED, &local->scanning);
550
551 memcpy(&local->scan_info, info, sizeof(*info));
552
553 wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work, 0);
554}
555EXPORT_SYMBOL(ieee80211_scan_completed);
556
557static int ieee80211_start_sw_scan(struct ieee80211_local *local,
558 struct ieee80211_sub_if_data *sdata)
559{
560 /* Software scan is not supported in multi-channel cases */
561 if (!local->emulate_chanctx)
562 return -EOPNOTSUPP;
563
564 /*
565 * Hardware/driver doesn't support hw_scan, so use software
566 * scanning instead. First send a nullfunc frame with power save
567 * bit on so that AP will buffer the frames for us while we are not
568 * listening, then send probe requests to each channel and wait for
569 * the responses. After all channels are scanned, tune back to the
570 * original channel and send a nullfunc frame with power save bit
571 * off to trigger the AP to send us all the buffered frames.
572 *
573 * Note that while local->sw_scanning is true everything else but
574 * nullfunc frames and probe requests will be dropped in
575 * ieee80211_tx_h_check_assoc().
576 */
577 drv_sw_scan_start(local, sdata, local->scan_addr);
578
579 local->leave_oper_channel_time = jiffies;
580 local->next_scan_state = SCAN_DECISION;
581 local->scan_channel_idx = 0;
582
583 ieee80211_offchannel_stop_vifs(local);
584
585 /* ensure nullfunc is transmitted before leaving operating channel */
586 ieee80211_flush_queues(local, NULL, false);
587
588 ieee80211_configure_filter(local);
589
590 /* We need to set power level at maximum rate for scanning. */
591 ieee80211_hw_conf_chan(local);
592
593 wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work, 0);
594
595 return 0;
596}
597
598static bool __ieee80211_can_leave_ch(struct ieee80211_sub_if_data *sdata,
599 struct cfg80211_scan_request *req)
600{
601 struct ieee80211_local *local = sdata->local;
602 struct ieee80211_sub_if_data *sdata_iter;
603 unsigned int link_id;
604
605 lockdep_assert_wiphy(local->hw.wiphy);
606
607 if (!ieee80211_is_radar_required(local, req))
608 return true;
609
610 if (!regulatory_pre_cac_allowed(local->hw.wiphy))
611 return false;
612
613 list_for_each_entry(sdata_iter, &local->interfaces, list) {
614 for_each_valid_link(&sdata_iter->wdev, link_id)
615 if (sdata_iter->wdev.links[link_id].cac_started)
616 return false;
617 }
618
619 return true;
620}
621
622static bool ieee80211_can_scan(struct ieee80211_local *local,
623 struct ieee80211_sub_if_data *sdata,
624 struct cfg80211_scan_request *req)
625{
626 if (!__ieee80211_can_leave_ch(sdata, req))
627 return false;
628
629 if (!list_empty(&local->roc_list))
630 return false;
631
632 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
633 sdata->u.mgd.flags & IEEE80211_STA_CONNECTION_POLL)
634 return false;
635
636 return true;
637}
638
639void ieee80211_run_deferred_scan(struct ieee80211_local *local)
640{
641 struct cfg80211_scan_request *req;
642
643 lockdep_assert_wiphy(local->hw.wiphy);
644
645 if (!local->scan_req || local->scanning)
646 return;
647
648 req = wiphy_dereference(local->hw.wiphy, local->scan_req);
649 if (!ieee80211_can_scan(local,
650 rcu_dereference_protected(
651 local->scan_sdata,
652 lockdep_is_held(&local->hw.wiphy->mtx)),
653 req))
654 return;
655
656 wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work,
657 round_jiffies_relative(0));
658}
659
660static void ieee80211_send_scan_probe_req(struct ieee80211_sub_if_data *sdata,
661 const u8 *src, const u8 *dst,
662 const u8 *ssid, size_t ssid_len,
663 const u8 *ie, size_t ie_len,
664 u32 ratemask, u32 flags, u32 tx_flags,
665 struct ieee80211_channel *channel)
666{
667 struct sk_buff *skb;
668
669 skb = ieee80211_build_probe_req(sdata, src, dst, ratemask, channel,
670 ssid, ssid_len,
671 ie, ie_len, flags);
672
673 if (skb) {
674 if (flags & IEEE80211_PROBE_FLAG_RANDOM_SN) {
675 struct ieee80211_hdr *hdr = (void *)skb->data;
676 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
677 u16 sn = get_random_u16();
678
679 info->control.flags |= IEEE80211_TX_CTRL_NO_SEQNO;
680 hdr->seq_ctrl =
681 cpu_to_le16(IEEE80211_SN_TO_SEQ(sn));
682 }
683 IEEE80211_SKB_CB(skb)->flags |= tx_flags;
684 IEEE80211_SKB_CB(skb)->control.flags |= IEEE80211_TX_CTRL_DONT_USE_RATE_MASK;
685 ieee80211_tx_skb_tid_band(sdata, skb, 7, channel->band);
686 }
687}
688
689static void ieee80211_scan_state_send_probe(struct ieee80211_local *local,
690 unsigned long *next_delay)
691{
692 int i;
693 struct ieee80211_sub_if_data *sdata;
694 struct cfg80211_scan_request *scan_req;
695 enum nl80211_band band = local->hw.conf.chandef.chan->band;
696 u32 flags = 0, tx_flags;
697
698 scan_req = rcu_dereference_protected(local->scan_req,
699 lockdep_is_held(&local->hw.wiphy->mtx));
700
701 tx_flags = IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
702 if (scan_req->no_cck)
703 tx_flags |= IEEE80211_TX_CTL_NO_CCK_RATE;
704 if (scan_req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT)
705 flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT;
706 if (scan_req->flags & NL80211_SCAN_FLAG_RANDOM_SN)
707 flags |= IEEE80211_PROBE_FLAG_RANDOM_SN;
708
709 sdata = rcu_dereference_protected(local->scan_sdata,
710 lockdep_is_held(&local->hw.wiphy->mtx));
711
712 for (i = 0; i < scan_req->n_ssids; i++)
713 ieee80211_send_scan_probe_req(
714 sdata, local->scan_addr, scan_req->bssid,
715 scan_req->ssids[i].ssid, scan_req->ssids[i].ssid_len,
716 scan_req->ie, scan_req->ie_len,
717 scan_req->rates[band], flags,
718 tx_flags, local->hw.conf.chandef.chan);
719
720 /*
721 * After sending probe requests, wait for probe responses
722 * on the channel.
723 */
724 *next_delay = msecs_to_jiffies(scan_req->duration) >
725 IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME ?
726 msecs_to_jiffies(scan_req->duration) - IEEE80211_PROBE_DELAY :
727 IEEE80211_CHANNEL_TIME;
728 local->next_scan_state = SCAN_DECISION;
729}
730
731static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata,
732 struct cfg80211_scan_request *req)
733{
734 struct ieee80211_local *local = sdata->local;
735 bool hw_scan = local->ops->hw_scan;
736 int rc;
737
738 lockdep_assert_wiphy(local->hw.wiphy);
739
740 if (local->scan_req)
741 return -EBUSY;
742
743 /* For an MLO connection, if a link ID was specified, validate that it
744 * is indeed active.
745 */
746 if (ieee80211_vif_is_mld(&sdata->vif) && req->tsf_report_link_id >= 0 &&
747 !(sdata->vif.active_links & BIT(req->tsf_report_link_id)))
748 return -EINVAL;
749
750 if (!__ieee80211_can_leave_ch(sdata, req))
751 return -EBUSY;
752
753 if (!ieee80211_can_scan(local, sdata, req)) {
754 /* wait for the work to finish/time out */
755 rcu_assign_pointer(local->scan_req, req);
756 rcu_assign_pointer(local->scan_sdata, sdata);
757 return 0;
758 }
759
760 again:
761 if (hw_scan) {
762 u8 *ies;
763
764 local->hw_scan_ies_bufsize = local->scan_ies_len + req->ie_len;
765
766 if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) {
767 int i, n_bands = 0;
768 u8 bands_counted = 0;
769
770 for (i = 0; i < req->n_channels; i++) {
771 if (bands_counted & BIT(req->channels[i]->band))
772 continue;
773 bands_counted |= BIT(req->channels[i]->band);
774 n_bands++;
775 }
776
777 local->hw_scan_ies_bufsize *= n_bands;
778 }
779
780 local->hw_scan_req = kmalloc(struct_size(local->hw_scan_req,
781 req.channels,
782 req->n_channels) +
783 local->hw_scan_ies_bufsize,
784 GFP_KERNEL);
785 if (!local->hw_scan_req)
786 return -ENOMEM;
787
788 local->hw_scan_req->req.ssids = req->ssids;
789 local->hw_scan_req->req.n_ssids = req->n_ssids;
790 /* None of the channels are actually set
791 * up but let UBSAN know the boundaries.
792 */
793 local->hw_scan_req->req.n_channels = req->n_channels;
794
795 ies = (u8 *)local->hw_scan_req +
796 sizeof(*local->hw_scan_req) +
797 req->n_channels * sizeof(req->channels[0]);
798 local->hw_scan_req->req.ie = ies;
799 local->hw_scan_req->req.flags = req->flags;
800 eth_broadcast_addr(local->hw_scan_req->req.bssid);
801 local->hw_scan_req->req.duration = req->duration;
802 local->hw_scan_req->req.duration_mandatory =
803 req->duration_mandatory;
804 local->hw_scan_req->req.tsf_report_link_id =
805 req->tsf_report_link_id;
806
807 local->hw_scan_band = 0;
808 local->hw_scan_req->req.n_6ghz_params = req->n_6ghz_params;
809 local->hw_scan_req->req.scan_6ghz_params =
810 req->scan_6ghz_params;
811 local->hw_scan_req->req.scan_6ghz = req->scan_6ghz;
812 local->hw_scan_req->req.first_part = req->first_part;
813
814 /*
815 * After allocating local->hw_scan_req, we must
816 * go through until ieee80211_prep_hw_scan(), so
817 * anything that might be changed here and leave
818 * this function early must not go after this
819 * allocation.
820 */
821 }
822
823 rcu_assign_pointer(local->scan_req, req);
824 rcu_assign_pointer(local->scan_sdata, sdata);
825
826 if (req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR)
827 get_random_mask_addr(local->scan_addr,
828 req->mac_addr,
829 req->mac_addr_mask);
830 else
831 memcpy(local->scan_addr, sdata->vif.addr, ETH_ALEN);
832
833 if (hw_scan) {
834 __set_bit(SCAN_HW_SCANNING, &local->scanning);
835 } else if ((req->n_channels == 1) &&
836 (req->channels[0] == local->hw.conf.chandef.chan)) {
837 /*
838 * If we are scanning only on the operating channel
839 * then we do not need to stop normal activities
840 */
841 unsigned long next_delay;
842
843 __set_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
844
845 ieee80211_recalc_idle(local);
846
847 /* Notify driver scan is starting, keep order of operations
848 * same as normal software scan, in case that matters. */
849 drv_sw_scan_start(local, sdata, local->scan_addr);
850
851 ieee80211_configure_filter(local); /* accept probe-responses */
852
853 /* We need to ensure power level is at max for scanning. */
854 ieee80211_hw_conf_chan(local);
855
856 if ((req->channels[0]->flags & (IEEE80211_CHAN_NO_IR |
857 IEEE80211_CHAN_RADAR)) ||
858 !req->n_ssids) {
859 next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
860 if (req->n_ssids)
861 set_bit(SCAN_BEACON_WAIT, &local->scanning);
862 } else {
863 ieee80211_scan_state_send_probe(local, &next_delay);
864 next_delay = IEEE80211_CHANNEL_TIME;
865 }
866
867 /* Now, just wait a bit and we are all done! */
868 wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work,
869 next_delay);
870 return 0;
871 } else {
872 /* Do normal software scan */
873 __set_bit(SCAN_SW_SCANNING, &local->scanning);
874 }
875
876 ieee80211_recalc_idle(local);
877
878 if (hw_scan) {
879 WARN_ON(!ieee80211_prep_hw_scan(sdata));
880 rc = drv_hw_scan(local, sdata, local->hw_scan_req);
881 } else {
882 rc = ieee80211_start_sw_scan(local, sdata);
883 }
884
885 if (rc) {
886 kfree(local->hw_scan_req);
887 local->hw_scan_req = NULL;
888 local->scanning = 0;
889
890 ieee80211_recalc_idle(local);
891
892 local->scan_req = NULL;
893 RCU_INIT_POINTER(local->scan_sdata, NULL);
894 }
895
896 if (hw_scan && rc == 1) {
897 /*
898 * we can't fall back to software for P2P-GO
899 * as it must update NoA etc.
900 */
901 if (ieee80211_vif_type_p2p(&sdata->vif) ==
902 NL80211_IFTYPE_P2P_GO)
903 return -EOPNOTSUPP;
904 hw_scan = false;
905 goto again;
906 }
907
908 return rc;
909}
910
911static unsigned long
912ieee80211_scan_get_channel_time(struct ieee80211_channel *chan)
913{
914 /*
915 * TODO: channel switching also consumes quite some time,
916 * add that delay as well to get a better estimation
917 */
918 if (chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR))
919 return IEEE80211_PASSIVE_CHANNEL_TIME;
920 return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME;
921}
922
923static void ieee80211_scan_state_decision(struct ieee80211_local *local,
924 unsigned long *next_delay)
925{
926 bool associated = false;
927 bool tx_empty = true;
928 bool bad_latency;
929 struct ieee80211_sub_if_data *sdata;
930 struct ieee80211_channel *next_chan;
931 enum mac80211_scan_state next_scan_state;
932 struct cfg80211_scan_request *scan_req;
933
934 lockdep_assert_wiphy(local->hw.wiphy);
935
936 /*
937 * check if at least one STA interface is associated,
938 * check if at least one STA interface has pending tx frames
939 * and grab the lowest used beacon interval
940 */
941 list_for_each_entry(sdata, &local->interfaces, list) {
942 if (!ieee80211_sdata_running(sdata))
943 continue;
944
945 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
946 if (sdata->u.mgd.associated) {
947 associated = true;
948
949 if (!qdisc_all_tx_empty(sdata->dev)) {
950 tx_empty = false;
951 break;
952 }
953 }
954 }
955 }
956
957 scan_req = rcu_dereference_protected(local->scan_req,
958 lockdep_is_held(&local->hw.wiphy->mtx));
959
960 next_chan = scan_req->channels[local->scan_channel_idx];
961
962 /*
963 * we're currently scanning a different channel, let's
964 * see if we can scan another channel without interfering
965 * with the current traffic situation.
966 *
967 * Keep good latency, do not stay off-channel more than 125 ms.
968 */
969
970 bad_latency = time_after(jiffies +
971 ieee80211_scan_get_channel_time(next_chan),
972 local->leave_oper_channel_time + HZ / 8);
973
974 if (associated && !tx_empty) {
975 if (scan_req->flags & NL80211_SCAN_FLAG_LOW_PRIORITY)
976 next_scan_state = SCAN_ABORT;
977 else
978 next_scan_state = SCAN_SUSPEND;
979 } else if (associated && bad_latency) {
980 next_scan_state = SCAN_SUSPEND;
981 } else {
982 next_scan_state = SCAN_SET_CHANNEL;
983 }
984
985 local->next_scan_state = next_scan_state;
986
987 *next_delay = 0;
988}
989
990static void ieee80211_scan_state_set_channel(struct ieee80211_local *local,
991 unsigned long *next_delay)
992{
993 int skip;
994 struct ieee80211_channel *chan;
995 struct cfg80211_scan_request *scan_req;
996
997 scan_req = rcu_dereference_protected(local->scan_req,
998 lockdep_is_held(&local->hw.wiphy->mtx));
999
1000 skip = 0;
1001 chan = scan_req->channels[local->scan_channel_idx];
1002
1003 local->scan_chandef.chan = chan;
1004 local->scan_chandef.center_freq1 = chan->center_freq;
1005 local->scan_chandef.freq1_offset = chan->freq_offset;
1006 local->scan_chandef.center_freq2 = 0;
1007
1008 /* For S1G, only scan the 1MHz primaries. */
1009 if (chan->band == NL80211_BAND_S1GHZ) {
1010 local->scan_chandef.width = NL80211_CHAN_WIDTH_1;
1011 local->scan_chandef.s1g_primary_2mhz = false;
1012 goto set_channel;
1013 }
1014
1015 /*
1016 * If scanning on oper channel, use whatever channel-type
1017 * is currently in use.
1018 */
1019 if (chan == local->hw.conf.chandef.chan)
1020 local->scan_chandef = local->hw.conf.chandef;
1021 else
1022 local->scan_chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
1023
1024set_channel:
1025 if (ieee80211_hw_conf_chan(local))
1026 skip = 1;
1027
1028 /* advance state machine to next channel/band */
1029 local->scan_channel_idx++;
1030
1031 if (skip) {
1032 /* if we skip this channel return to the decision state */
1033 local->next_scan_state = SCAN_DECISION;
1034 return;
1035 }
1036
1037 /*
1038 * Probe delay is used to update the NAV, cf. 11.1.3.2.2
1039 * (which unfortunately doesn't say _why_ step a) is done,
1040 * but it waits for the probe delay or until a frame is
1041 * received - and the received frame would update the NAV).
1042 * For now, we do not support waiting until a frame is
1043 * received.
1044 *
1045 * In any case, it is not necessary for a passive scan.
1046 */
1047 if ((chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR)) ||
1048 !scan_req->n_ssids) {
1049 *next_delay = max(msecs_to_jiffies(scan_req->duration),
1050 IEEE80211_PASSIVE_CHANNEL_TIME);
1051 local->next_scan_state = SCAN_DECISION;
1052 if (scan_req->n_ssids)
1053 set_bit(SCAN_BEACON_WAIT, &local->scanning);
1054 return;
1055 }
1056
1057 /* active scan, send probes */
1058 *next_delay = IEEE80211_PROBE_DELAY;
1059 local->next_scan_state = SCAN_SEND_PROBE;
1060}
1061
1062static void ieee80211_scan_state_suspend(struct ieee80211_local *local,
1063 unsigned long *next_delay)
1064{
1065 /* switch back to the operating channel */
1066 local->scan_chandef.chan = NULL;
1067 ieee80211_hw_conf_chan(local);
1068
1069 /* disable PS */
1070 ieee80211_offchannel_return(local);
1071
1072 *next_delay = HZ / 5;
1073 /* afterwards, resume scan & go to next channel */
1074 local->next_scan_state = SCAN_RESUME;
1075}
1076
1077static void ieee80211_scan_state_resume(struct ieee80211_local *local,
1078 unsigned long *next_delay)
1079{
1080 ieee80211_offchannel_stop_vifs(local);
1081
1082 if (local->ops->flush) {
1083 ieee80211_flush_queues(local, NULL, false);
1084 *next_delay = 0;
1085 } else
1086 *next_delay = HZ / 10;
1087
1088 /* remember when we left the operating channel */
1089 local->leave_oper_channel_time = jiffies;
1090
1091 /* advance to the next channel to be scanned */
1092 local->next_scan_state = SCAN_SET_CHANNEL;
1093}
1094
1095void ieee80211_scan_work(struct wiphy *wiphy, struct wiphy_work *work)
1096{
1097 struct ieee80211_local *local =
1098 container_of(work, struct ieee80211_local, scan_work.work);
1099 struct ieee80211_sub_if_data *sdata;
1100 struct cfg80211_scan_request *scan_req;
1101 unsigned long next_delay = 0;
1102 bool aborted;
1103
1104 lockdep_assert_wiphy(local->hw.wiphy);
1105
1106 if (!ieee80211_can_run_worker(local)) {
1107 aborted = true;
1108 goto out_complete;
1109 }
1110
1111 sdata = rcu_dereference_protected(local->scan_sdata,
1112 lockdep_is_held(&local->hw.wiphy->mtx));
1113 scan_req = rcu_dereference_protected(local->scan_req,
1114 lockdep_is_held(&local->hw.wiphy->mtx));
1115
1116 /* When scanning on-channel, the first-callback means completed. */
1117 if (test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning)) {
1118 aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning);
1119 goto out_complete;
1120 }
1121
1122 if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) {
1123 aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning);
1124 goto out_complete;
1125 }
1126
1127 if (!sdata || !scan_req)
1128 return;
1129
1130 if (!local->scanning) {
1131 int rc;
1132
1133 RCU_INIT_POINTER(local->scan_req, NULL);
1134 RCU_INIT_POINTER(local->scan_sdata, NULL);
1135
1136 rc = __ieee80211_start_scan(sdata, scan_req);
1137 if (!rc)
1138 return;
1139 /* need to complete scan in cfg80211 */
1140 rcu_assign_pointer(local->scan_req, scan_req);
1141 aborted = true;
1142 goto out_complete;
1143 }
1144
1145 clear_bit(SCAN_BEACON_WAIT, &local->scanning);
1146
1147 /*
1148 * as long as no delay is required advance immediately
1149 * without scheduling a new work
1150 */
1151 do {
1152 if (!ieee80211_sdata_running(sdata)) {
1153 aborted = true;
1154 goto out_complete;
1155 }
1156
1157 if (test_and_clear_bit(SCAN_BEACON_DONE, &local->scanning) &&
1158 local->next_scan_state == SCAN_DECISION)
1159 local->next_scan_state = SCAN_SEND_PROBE;
1160
1161 switch (local->next_scan_state) {
1162 case SCAN_DECISION:
1163 /* if no more bands/channels left, complete scan */
1164 if (local->scan_channel_idx >= scan_req->n_channels) {
1165 aborted = false;
1166 goto out_complete;
1167 }
1168 ieee80211_scan_state_decision(local, &next_delay);
1169 break;
1170 case SCAN_SET_CHANNEL:
1171 ieee80211_scan_state_set_channel(local, &next_delay);
1172 break;
1173 case SCAN_SEND_PROBE:
1174 ieee80211_scan_state_send_probe(local, &next_delay);
1175 break;
1176 case SCAN_SUSPEND:
1177 ieee80211_scan_state_suspend(local, &next_delay);
1178 break;
1179 case SCAN_RESUME:
1180 ieee80211_scan_state_resume(local, &next_delay);
1181 break;
1182 case SCAN_ABORT:
1183 aborted = true;
1184 goto out_complete;
1185 }
1186 } while (next_delay == 0);
1187
1188 wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work,
1189 next_delay);
1190 return;
1191
1192out_complete:
1193 __ieee80211_scan_completed(&local->hw, aborted);
1194}
1195
1196int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata,
1197 struct cfg80211_scan_request *req)
1198{
1199 lockdep_assert_wiphy(sdata->local->hw.wiphy);
1200
1201 return __ieee80211_start_scan(sdata, req);
1202}
1203
1204int ieee80211_request_ibss_scan(struct ieee80211_sub_if_data *sdata,
1205 const u8 *ssid, u8 ssid_len,
1206 struct ieee80211_channel **channels,
1207 unsigned int n_channels)
1208{
1209 struct ieee80211_local *local = sdata->local;
1210 int i, n_ch = 0;
1211 enum nl80211_band band;
1212
1213 lockdep_assert_wiphy(local->hw.wiphy);
1214
1215 /* busy scanning */
1216 if (local->scan_req)
1217 return -EBUSY;
1218
1219 /* fill internal scan request */
1220 if (!channels) {
1221 int max_n;
1222
1223 for (band = 0; band < NUM_NL80211_BANDS; band++) {
1224 if (!local->hw.wiphy->bands[band] ||
1225 band == NL80211_BAND_6GHZ ||
1226 band == NL80211_BAND_S1GHZ)
1227 continue;
1228
1229 max_n = local->hw.wiphy->bands[band]->n_channels;
1230 for (i = 0; i < max_n; i++) {
1231 struct ieee80211_channel *tmp_ch =
1232 &local->hw.wiphy->bands[band]->channels[i];
1233
1234 if (tmp_ch->flags & (IEEE80211_CHAN_NO_IR |
1235 IEEE80211_CHAN_DISABLED) ||
1236 !cfg80211_wdev_channel_allowed(&sdata->wdev,
1237 tmp_ch))
1238 continue;
1239
1240 local->int_scan_req->channels[n_ch] = tmp_ch;
1241 n_ch++;
1242 }
1243 }
1244
1245 if (n_ch == 0)
1246 return -EINVAL;
1247
1248 local->int_scan_req->n_channels = n_ch;
1249 } else {
1250 for (i = 0; i < n_channels; i++) {
1251 if (channels[i]->flags & (IEEE80211_CHAN_NO_IR |
1252 IEEE80211_CHAN_DISABLED) ||
1253 !cfg80211_wdev_channel_allowed(&sdata->wdev,
1254 channels[i]))
1255 continue;
1256
1257 local->int_scan_req->channels[n_ch] = channels[i];
1258 n_ch++;
1259 }
1260
1261 if (n_ch == 0)
1262 return -EINVAL;
1263
1264 local->int_scan_req->n_channels = n_ch;
1265 }
1266
1267 local->int_scan_req->ssids = &local->scan_ssid;
1268 local->int_scan_req->n_ssids = 1;
1269 memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN);
1270 local->int_scan_req->ssids[0].ssid_len = ssid_len;
1271
1272 return __ieee80211_start_scan(sdata, sdata->local->int_scan_req);
1273}
1274
1275void ieee80211_scan_cancel(struct ieee80211_local *local)
1276{
1277 /* ensure a new scan cannot be queued */
1278 lockdep_assert_wiphy(local->hw.wiphy);
1279
1280 /*
1281 * We are canceling software scan, or deferred scan that was not
1282 * yet really started (see __ieee80211_start_scan ).
1283 *
1284 * Regarding hardware scan:
1285 * - we can not call __ieee80211_scan_completed() as when
1286 * SCAN_HW_SCANNING bit is set this function change
1287 * local->hw_scan_req to operate on 5G band, what race with
1288 * driver which can use local->hw_scan_req
1289 *
1290 * - we can not cancel scan_work since driver can schedule it
1291 * by ieee80211_scan_completed(..., true) to finish scan
1292 *
1293 * Hence we only call the cancel_hw_scan() callback, but the low-level
1294 * driver is still responsible for calling ieee80211_scan_completed()
1295 * after the scan was completed/aborted.
1296 */
1297
1298 if (!local->scan_req)
1299 return;
1300
1301 /*
1302 * We have a scan running and the driver already reported completion,
1303 * but the worker hasn't run yet or is stuck on the mutex - mark it as
1304 * cancelled.
1305 */
1306 if (test_bit(SCAN_HW_SCANNING, &local->scanning) &&
1307 test_bit(SCAN_COMPLETED, &local->scanning)) {
1308 set_bit(SCAN_HW_CANCELLED, &local->scanning);
1309 return;
1310 }
1311
1312 if (test_bit(SCAN_HW_SCANNING, &local->scanning)) {
1313 /*
1314 * Make sure that __ieee80211_scan_completed doesn't trigger a
1315 * scan on another band.
1316 */
1317 set_bit(SCAN_HW_CANCELLED, &local->scanning);
1318 if (local->ops->cancel_hw_scan)
1319 drv_cancel_hw_scan(local,
1320 rcu_dereference_protected(local->scan_sdata,
1321 lockdep_is_held(&local->hw.wiphy->mtx)));
1322 return;
1323 }
1324
1325 wiphy_delayed_work_cancel(local->hw.wiphy, &local->scan_work);
1326 /* and clean up */
1327 memset(&local->scan_info, 0, sizeof(local->scan_info));
1328 __ieee80211_scan_completed(&local->hw, true);
1329}
1330
1331int __ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata,
1332 struct cfg80211_sched_scan_request *req)
1333{
1334 struct ieee80211_local *local = sdata->local;
1335 struct ieee80211_scan_ies sched_scan_ies = {};
1336 struct cfg80211_chan_def chandef;
1337 int ret, i, iebufsz, num_bands = 0;
1338 u32 rate_masks[NUM_NL80211_BANDS] = {};
1339 u8 bands_used = 0;
1340 u8 *ie;
1341 u32 flags = 0;
1342
1343 lockdep_assert_wiphy(local->hw.wiphy);
1344
1345 iebufsz = local->scan_ies_len + req->ie_len;
1346
1347 if (!local->ops->sched_scan_start)
1348 return -EOPNOTSUPP;
1349
1350 for (i = 0; i < NUM_NL80211_BANDS; i++) {
1351 if (local->hw.wiphy->bands[i]) {
1352 bands_used |= BIT(i);
1353 rate_masks[i] = (u32) -1;
1354 num_bands++;
1355 }
1356 }
1357
1358 if (req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT)
1359 flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT;
1360
1361 ie = kcalloc(iebufsz, num_bands, GFP_KERNEL);
1362 if (!ie) {
1363 ret = -ENOMEM;
1364 goto out;
1365 }
1366
1367 ieee80211_prepare_scan_chandef(&chandef);
1368
1369 ret = ieee80211_build_preq_ies(sdata, ie, num_bands * iebufsz,
1370 &sched_scan_ies, req->ie,
1371 req->ie_len, bands_used, rate_masks,
1372 &chandef, flags);
1373 if (ret < 0)
1374 goto error;
1375
1376 ret = drv_sched_scan_start(local, sdata, req, &sched_scan_ies);
1377 if (ret == 0) {
1378 rcu_assign_pointer(local->sched_scan_sdata, sdata);
1379 rcu_assign_pointer(local->sched_scan_req, req);
1380 }
1381
1382error:
1383 kfree(ie);
1384out:
1385 if (ret) {
1386 /* Clean in case of failure after HW restart or upon resume. */
1387 RCU_INIT_POINTER(local->sched_scan_sdata, NULL);
1388 RCU_INIT_POINTER(local->sched_scan_req, NULL);
1389 }
1390
1391 return ret;
1392}
1393
1394int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata,
1395 struct cfg80211_sched_scan_request *req)
1396{
1397 struct ieee80211_local *local = sdata->local;
1398
1399 lockdep_assert_wiphy(local->hw.wiphy);
1400
1401 if (rcu_access_pointer(local->sched_scan_sdata))
1402 return -EBUSY;
1403
1404 return __ieee80211_request_sched_scan_start(sdata, req);
1405}
1406
1407int ieee80211_request_sched_scan_stop(struct ieee80211_local *local)
1408{
1409 struct ieee80211_sub_if_data *sched_scan_sdata;
1410 int ret = -ENOENT;
1411
1412 lockdep_assert_wiphy(local->hw.wiphy);
1413
1414 if (!local->ops->sched_scan_stop)
1415 return -EOPNOTSUPP;
1416
1417 /* We don't want to restart sched scan anymore. */
1418 RCU_INIT_POINTER(local->sched_scan_req, NULL);
1419
1420 sched_scan_sdata = rcu_dereference_protected(local->sched_scan_sdata,
1421 lockdep_is_held(&local->hw.wiphy->mtx));
1422 if (sched_scan_sdata) {
1423 ret = drv_sched_scan_stop(local, sched_scan_sdata);
1424 if (!ret)
1425 RCU_INIT_POINTER(local->sched_scan_sdata, NULL);
1426 }
1427
1428 return ret;
1429}
1430
1431void ieee80211_sched_scan_results(struct ieee80211_hw *hw)
1432{
1433 struct ieee80211_local *local = hw_to_local(hw);
1434
1435 trace_api_sched_scan_results(local);
1436
1437 cfg80211_sched_scan_results(hw->wiphy, 0);
1438}
1439EXPORT_SYMBOL(ieee80211_sched_scan_results);
1440
1441void ieee80211_sched_scan_end(struct ieee80211_local *local)
1442{
1443 lockdep_assert_wiphy(local->hw.wiphy);
1444
1445 if (!rcu_access_pointer(local->sched_scan_sdata))
1446 return;
1447
1448 RCU_INIT_POINTER(local->sched_scan_sdata, NULL);
1449
1450 /* If sched scan was aborted by the driver. */
1451 RCU_INIT_POINTER(local->sched_scan_req, NULL);
1452
1453 cfg80211_sched_scan_stopped_locked(local->hw.wiphy, 0);
1454}
1455
1456void ieee80211_sched_scan_stopped_work(struct wiphy *wiphy,
1457 struct wiphy_work *work)
1458{
1459 struct ieee80211_local *local =
1460 container_of(work, struct ieee80211_local,
1461 sched_scan_stopped_work);
1462
1463 ieee80211_sched_scan_end(local);
1464}
1465
1466void ieee80211_sched_scan_stopped(struct ieee80211_hw *hw)
1467{
1468 struct ieee80211_local *local = hw_to_local(hw);
1469
1470 trace_api_sched_scan_stopped(local);
1471
1472 /*
1473 * this shouldn't really happen, so for simplicity
1474 * simply ignore it, and let mac80211 reconfigure
1475 * the sched scan later on.
1476 */
1477 if (local->in_reconfig)
1478 return;
1479
1480 wiphy_work_queue(hw->wiphy, &local->sched_scan_stopped_work);
1481}
1482EXPORT_SYMBOL(ieee80211_sched_scan_stopped);