xref: /linux/net/mac80211/scan.c (revision 55d0969c451159cff86949b38c39171cab962069)
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 
32 void ieee80211_rx_bss_put(struct ieee80211_local *local,
33 			  struct ieee80211_bss *bss)
34 {
35 	if (!bss)
36 		return;
37 	cfg80211_put_bss(local->hw.wiphy,
38 			 container_of((void *)bss, struct cfg80211_bss, priv));
39 }
40 
41 static bool is_uapsd_supported(struct ieee802_11_elems *elems)
42 {
43 	u8 qos_info;
44 
45 	if (elems->wmm_info && elems->wmm_info_len == 7
46 	    && elems->wmm_info[5] == 1)
47 		qos_info = elems->wmm_info[6];
48 	else if (elems->wmm_param && elems->wmm_param_len == 24
49 		 && elems->wmm_param[5] == 1)
50 		qos_info = elems->wmm_param[6];
51 	else
52 		/* no valid wmm information or parameter element found */
53 		return false;
54 
55 	return qos_info & IEEE80211_WMM_IE_AP_QOSINFO_UAPSD;
56 }
57 
58 struct inform_bss_update_data {
59 	struct ieee80211_rx_status *rx_status;
60 	bool beacon;
61 };
62 
63 void 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 
163 struct ieee80211_bss *
164 ieee80211_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 
239 static 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 
257 void 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 
347 static 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 */
355 static 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;
362 	u32 *n_chans;
363 	u32 flags = 0;
364 
365 	req = rcu_dereference_protected(local->scan_req,
366 					lockdep_is_held(&local->hw.wiphy->mtx));
367 
368 	if (test_bit(SCAN_HW_CANCELLED, &local->scanning))
369 		return false;
370 
371 	if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) {
372 		local->hw_scan_req->req.n_channels = req->n_channels;
373 
374 		for (i = 0; i < req->n_channels; i++) {
375 			local->hw_scan_req->req.channels[i] = req->channels[i];
376 			bands_used |= BIT(req->channels[i]->band);
377 		}
378 	} else {
379 		do {
380 			if (local->hw_scan_band == NUM_NL80211_BANDS)
381 				return false;
382 
383 			n_chans = &local->hw_scan_req->req.n_channels;
384 			*n_chans = 0;
385 
386 			for (i = 0; i < req->n_channels; i++) {
387 				if (req->channels[i]->band !=
388 				    local->hw_scan_band)
389 					continue;
390 				local->hw_scan_req->req.channels[(*n_chans)++] =
391 							req->channels[i];
392 
393 				bands_used |= BIT(req->channels[i]->band);
394 			}
395 
396 			local->hw_scan_band++;
397 		} while (!*n_chans);
398 	}
399 
400 	ieee80211_prepare_scan_chandef(&chandef);
401 
402 	if (req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT)
403 		flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT;
404 
405 	ielen = ieee80211_build_preq_ies(sdata,
406 					 (u8 *)local->hw_scan_req->req.ie,
407 					 local->hw_scan_ies_bufsize,
408 					 &local->hw_scan_req->ies,
409 					 req->ie, req->ie_len,
410 					 bands_used, req->rates, &chandef,
411 					 flags);
412 	if (ielen < 0)
413 		return false;
414 	local->hw_scan_req->req.ie_len = ielen;
415 	local->hw_scan_req->req.no_cck = req->no_cck;
416 	ether_addr_copy(local->hw_scan_req->req.mac_addr, req->mac_addr);
417 	ether_addr_copy(local->hw_scan_req->req.mac_addr_mask,
418 			req->mac_addr_mask);
419 	ether_addr_copy(local->hw_scan_req->req.bssid, req->bssid);
420 
421 	return true;
422 }
423 
424 static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted)
425 {
426 	struct ieee80211_local *local = hw_to_local(hw);
427 	bool hw_scan = test_bit(SCAN_HW_SCANNING, &local->scanning);
428 	bool was_scanning = local->scanning;
429 	struct cfg80211_scan_request *scan_req;
430 	struct ieee80211_sub_if_data *scan_sdata;
431 	struct ieee80211_sub_if_data *sdata;
432 
433 	lockdep_assert_wiphy(local->hw.wiphy);
434 
435 	/*
436 	 * It's ok to abort a not-yet-running scan (that
437 	 * we have one at all will be verified by checking
438 	 * local->scan_req next), but not to complete it
439 	 * successfully.
440 	 */
441 	if (WARN_ON(!local->scanning && !aborted))
442 		aborted = true;
443 
444 	if (WARN_ON(!local->scan_req))
445 		return;
446 
447 	scan_sdata = rcu_dereference_protected(local->scan_sdata,
448 					       lockdep_is_held(&local->hw.wiphy->mtx));
449 
450 	if (hw_scan && !aborted &&
451 	    !ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS) &&
452 	    ieee80211_prep_hw_scan(scan_sdata)) {
453 		int rc;
454 
455 		rc = drv_hw_scan(local,
456 			rcu_dereference_protected(local->scan_sdata,
457 						  lockdep_is_held(&local->hw.wiphy->mtx)),
458 			local->hw_scan_req);
459 
460 		if (rc == 0)
461 			return;
462 
463 		/* HW scan failed and is going to be reported as aborted,
464 		 * so clear old scan info.
465 		 */
466 		memset(&local->scan_info, 0, sizeof(local->scan_info));
467 		aborted = true;
468 	}
469 
470 	kfree(local->hw_scan_req);
471 	local->hw_scan_req = NULL;
472 
473 	scan_req = rcu_dereference_protected(local->scan_req,
474 					     lockdep_is_held(&local->hw.wiphy->mtx));
475 
476 	RCU_INIT_POINTER(local->scan_req, NULL);
477 	RCU_INIT_POINTER(local->scan_sdata, NULL);
478 
479 	local->scanning = 0;
480 	local->scan_chandef.chan = NULL;
481 
482 	synchronize_rcu();
483 
484 	if (scan_req != local->int_scan_req) {
485 		local->scan_info.aborted = aborted;
486 		cfg80211_scan_done(scan_req, &local->scan_info);
487 	}
488 
489 	/* Set power back to normal operating levels. */
490 	ieee80211_hw_conf_chan(local);
491 
492 	if (!hw_scan && was_scanning) {
493 		ieee80211_configure_filter(local);
494 		drv_sw_scan_complete(local, scan_sdata);
495 		ieee80211_offchannel_return(local);
496 	}
497 
498 	ieee80211_recalc_idle(local);
499 
500 	ieee80211_mlme_notify_scan_completed(local);
501 	ieee80211_ibss_notify_scan_completed(local);
502 
503 	/* Requeue all the work that might have been ignored while
504 	 * the scan was in progress; if there was none this will
505 	 * just be a no-op for the particular interface.
506 	 */
507 	list_for_each_entry(sdata, &local->interfaces, list) {
508 		if (ieee80211_sdata_running(sdata))
509 			wiphy_work_queue(sdata->local->hw.wiphy, &sdata->work);
510 	}
511 
512 	if (was_scanning)
513 		ieee80211_start_next_roc(local);
514 }
515 
516 void ieee80211_scan_completed(struct ieee80211_hw *hw,
517 			      struct cfg80211_scan_info *info)
518 {
519 	struct ieee80211_local *local = hw_to_local(hw);
520 
521 	trace_api_scan_completed(local, info->aborted);
522 
523 	set_bit(SCAN_COMPLETED, &local->scanning);
524 	if (info->aborted)
525 		set_bit(SCAN_ABORTED, &local->scanning);
526 
527 	memcpy(&local->scan_info, info, sizeof(*info));
528 
529 	wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work, 0);
530 }
531 EXPORT_SYMBOL(ieee80211_scan_completed);
532 
533 static int ieee80211_start_sw_scan(struct ieee80211_local *local,
534 				   struct ieee80211_sub_if_data *sdata)
535 {
536 	/* Software scan is not supported in multi-channel cases */
537 	if (!local->emulate_chanctx)
538 		return -EOPNOTSUPP;
539 
540 	/*
541 	 * Hardware/driver doesn't support hw_scan, so use software
542 	 * scanning instead. First send a nullfunc frame with power save
543 	 * bit on so that AP will buffer the frames for us while we are not
544 	 * listening, then send probe requests to each channel and wait for
545 	 * the responses. After all channels are scanned, tune back to the
546 	 * original channel and send a nullfunc frame with power save bit
547 	 * off to trigger the AP to send us all the buffered frames.
548 	 *
549 	 * Note that while local->sw_scanning is true everything else but
550 	 * nullfunc frames and probe requests will be dropped in
551 	 * ieee80211_tx_h_check_assoc().
552 	 */
553 	drv_sw_scan_start(local, sdata, local->scan_addr);
554 
555 	local->leave_oper_channel_time = jiffies;
556 	local->next_scan_state = SCAN_DECISION;
557 	local->scan_channel_idx = 0;
558 
559 	ieee80211_offchannel_stop_vifs(local);
560 
561 	/* ensure nullfunc is transmitted before leaving operating channel */
562 	ieee80211_flush_queues(local, NULL, false);
563 
564 	ieee80211_configure_filter(local);
565 
566 	/* We need to set power level at maximum rate for scanning. */
567 	ieee80211_hw_conf_chan(local);
568 
569 	wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work, 0);
570 
571 	return 0;
572 }
573 
574 static bool __ieee80211_can_leave_ch(struct ieee80211_sub_if_data *sdata)
575 {
576 	struct ieee80211_local *local = sdata->local;
577 	struct ieee80211_sub_if_data *sdata_iter;
578 	unsigned int link_id;
579 
580 	lockdep_assert_wiphy(local->hw.wiphy);
581 
582 	if (!ieee80211_is_radar_required(local))
583 		return true;
584 
585 	if (!regulatory_pre_cac_allowed(local->hw.wiphy))
586 		return false;
587 
588 	list_for_each_entry(sdata_iter, &local->interfaces, list) {
589 		for_each_valid_link(&sdata_iter->wdev, link_id)
590 			if (sdata_iter->wdev.links[link_id].cac_started)
591 				return false;
592 	}
593 
594 	return true;
595 }
596 
597 static bool ieee80211_can_scan(struct ieee80211_local *local,
598 			       struct ieee80211_sub_if_data *sdata)
599 {
600 	if (!__ieee80211_can_leave_ch(sdata))
601 		return false;
602 
603 	if (!list_empty(&local->roc_list))
604 		return false;
605 
606 	if (sdata->vif.type == NL80211_IFTYPE_STATION &&
607 	    sdata->u.mgd.flags & IEEE80211_STA_CONNECTION_POLL)
608 		return false;
609 
610 	return true;
611 }
612 
613 void ieee80211_run_deferred_scan(struct ieee80211_local *local)
614 {
615 	lockdep_assert_wiphy(local->hw.wiphy);
616 
617 	if (!local->scan_req || local->scanning)
618 		return;
619 
620 	if (!ieee80211_can_scan(local,
621 				rcu_dereference_protected(
622 					local->scan_sdata,
623 					lockdep_is_held(&local->hw.wiphy->mtx))))
624 		return;
625 
626 	wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work,
627 				 round_jiffies_relative(0));
628 }
629 
630 static void ieee80211_send_scan_probe_req(struct ieee80211_sub_if_data *sdata,
631 					  const u8 *src, const u8 *dst,
632 					  const u8 *ssid, size_t ssid_len,
633 					  const u8 *ie, size_t ie_len,
634 					  u32 ratemask, u32 flags, u32 tx_flags,
635 					  struct ieee80211_channel *channel)
636 {
637 	struct sk_buff *skb;
638 
639 	skb = ieee80211_build_probe_req(sdata, src, dst, ratemask, channel,
640 					ssid, ssid_len,
641 					ie, ie_len, flags);
642 
643 	if (skb) {
644 		if (flags & IEEE80211_PROBE_FLAG_RANDOM_SN) {
645 			struct ieee80211_hdr *hdr = (void *)skb->data;
646 			struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
647 			u16 sn = get_random_u16();
648 
649 			info->control.flags |= IEEE80211_TX_CTRL_NO_SEQNO;
650 			hdr->seq_ctrl =
651 				cpu_to_le16(IEEE80211_SN_TO_SEQ(sn));
652 		}
653 		IEEE80211_SKB_CB(skb)->flags |= tx_flags;
654 		IEEE80211_SKB_CB(skb)->control.flags |= IEEE80211_TX_CTRL_DONT_USE_RATE_MASK;
655 		ieee80211_tx_skb_tid_band(sdata, skb, 7, channel->band);
656 	}
657 }
658 
659 static void ieee80211_scan_state_send_probe(struct ieee80211_local *local,
660 					    unsigned long *next_delay)
661 {
662 	int i;
663 	struct ieee80211_sub_if_data *sdata;
664 	struct cfg80211_scan_request *scan_req;
665 	enum nl80211_band band = local->hw.conf.chandef.chan->band;
666 	u32 flags = 0, tx_flags;
667 
668 	scan_req = rcu_dereference_protected(local->scan_req,
669 					     lockdep_is_held(&local->hw.wiphy->mtx));
670 
671 	tx_flags = IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
672 	if (scan_req->no_cck)
673 		tx_flags |= IEEE80211_TX_CTL_NO_CCK_RATE;
674 	if (scan_req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT)
675 		flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT;
676 	if (scan_req->flags & NL80211_SCAN_FLAG_RANDOM_SN)
677 		flags |= IEEE80211_PROBE_FLAG_RANDOM_SN;
678 
679 	sdata = rcu_dereference_protected(local->scan_sdata,
680 					  lockdep_is_held(&local->hw.wiphy->mtx));
681 
682 	for (i = 0; i < scan_req->n_ssids; i++)
683 		ieee80211_send_scan_probe_req(
684 			sdata, local->scan_addr, scan_req->bssid,
685 			scan_req->ssids[i].ssid, scan_req->ssids[i].ssid_len,
686 			scan_req->ie, scan_req->ie_len,
687 			scan_req->rates[band], flags,
688 			tx_flags, local->hw.conf.chandef.chan);
689 
690 	/*
691 	 * After sending probe requests, wait for probe responses
692 	 * on the channel.
693 	 */
694 	*next_delay = msecs_to_jiffies(scan_req->duration) >
695 		      IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME ?
696 		      msecs_to_jiffies(scan_req->duration) - IEEE80211_PROBE_DELAY :
697 		      IEEE80211_CHANNEL_TIME;
698 	local->next_scan_state = SCAN_DECISION;
699 }
700 
701 static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata,
702 				  struct cfg80211_scan_request *req)
703 {
704 	struct ieee80211_local *local = sdata->local;
705 	bool hw_scan = local->ops->hw_scan;
706 	int rc;
707 
708 	lockdep_assert_wiphy(local->hw.wiphy);
709 
710 	if (local->scan_req)
711 		return -EBUSY;
712 
713 	/* For an MLO connection, if a link ID was specified, validate that it
714 	 * is indeed active.
715 	 */
716 	if (ieee80211_vif_is_mld(&sdata->vif) && req->tsf_report_link_id >= 0 &&
717 	    !(sdata->vif.active_links & BIT(req->tsf_report_link_id)))
718 		return -EINVAL;
719 
720 	if (!__ieee80211_can_leave_ch(sdata))
721 		return -EBUSY;
722 
723 	if (!ieee80211_can_scan(local, sdata)) {
724 		/* wait for the work to finish/time out */
725 		rcu_assign_pointer(local->scan_req, req);
726 		rcu_assign_pointer(local->scan_sdata, sdata);
727 		return 0;
728 	}
729 
730  again:
731 	if (hw_scan) {
732 		u8 *ies;
733 
734 		local->hw_scan_ies_bufsize = local->scan_ies_len + req->ie_len;
735 
736 		if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) {
737 			int i, n_bands = 0;
738 			u8 bands_counted = 0;
739 
740 			for (i = 0; i < req->n_channels; i++) {
741 				if (bands_counted & BIT(req->channels[i]->band))
742 					continue;
743 				bands_counted |= BIT(req->channels[i]->band);
744 				n_bands++;
745 			}
746 
747 			local->hw_scan_ies_bufsize *= n_bands;
748 		}
749 
750 		local->hw_scan_req = kmalloc(struct_size(local->hw_scan_req,
751 							 req.channels,
752 							 req->n_channels) +
753 					     local->hw_scan_ies_bufsize,
754 					     GFP_KERNEL);
755 		if (!local->hw_scan_req)
756 			return -ENOMEM;
757 
758 		local->hw_scan_req->req.ssids = req->ssids;
759 		local->hw_scan_req->req.n_ssids = req->n_ssids;
760 		/* None of the channels are actually set
761 		 * up but let UBSAN know the boundaries.
762 		 */
763 		local->hw_scan_req->req.n_channels = req->n_channels;
764 
765 		ies = (u8 *)local->hw_scan_req +
766 			sizeof(*local->hw_scan_req) +
767 			req->n_channels * sizeof(req->channels[0]);
768 		local->hw_scan_req->req.ie = ies;
769 		local->hw_scan_req->req.flags = req->flags;
770 		eth_broadcast_addr(local->hw_scan_req->req.bssid);
771 		local->hw_scan_req->req.duration = req->duration;
772 		local->hw_scan_req->req.duration_mandatory =
773 			req->duration_mandatory;
774 		local->hw_scan_req->req.tsf_report_link_id =
775 			req->tsf_report_link_id;
776 
777 		local->hw_scan_band = 0;
778 		local->hw_scan_req->req.n_6ghz_params = req->n_6ghz_params;
779 		local->hw_scan_req->req.scan_6ghz_params =
780 			req->scan_6ghz_params;
781 		local->hw_scan_req->req.scan_6ghz = req->scan_6ghz;
782 
783 		/*
784 		 * After allocating local->hw_scan_req, we must
785 		 * go through until ieee80211_prep_hw_scan(), so
786 		 * anything that might be changed here and leave
787 		 * this function early must not go after this
788 		 * allocation.
789 		 */
790 	}
791 
792 	rcu_assign_pointer(local->scan_req, req);
793 	rcu_assign_pointer(local->scan_sdata, sdata);
794 
795 	if (req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR)
796 		get_random_mask_addr(local->scan_addr,
797 				     req->mac_addr,
798 				     req->mac_addr_mask);
799 	else
800 		memcpy(local->scan_addr, sdata->vif.addr, ETH_ALEN);
801 
802 	if (hw_scan) {
803 		__set_bit(SCAN_HW_SCANNING, &local->scanning);
804 	} else if ((req->n_channels == 1) &&
805 		   (req->channels[0] == local->hw.conf.chandef.chan)) {
806 		/*
807 		 * If we are scanning only on the operating channel
808 		 * then we do not need to stop normal activities
809 		 */
810 		unsigned long next_delay;
811 
812 		__set_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
813 
814 		ieee80211_recalc_idle(local);
815 
816 		/* Notify driver scan is starting, keep order of operations
817 		 * same as normal software scan, in case that matters. */
818 		drv_sw_scan_start(local, sdata, local->scan_addr);
819 
820 		ieee80211_configure_filter(local); /* accept probe-responses */
821 
822 		/* We need to ensure power level is at max for scanning. */
823 		ieee80211_hw_conf_chan(local);
824 
825 		if ((req->channels[0]->flags & (IEEE80211_CHAN_NO_IR |
826 						IEEE80211_CHAN_RADAR)) ||
827 		    !req->n_ssids) {
828 			next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
829 			if (req->n_ssids)
830 				set_bit(SCAN_BEACON_WAIT, &local->scanning);
831 		} else {
832 			ieee80211_scan_state_send_probe(local, &next_delay);
833 			next_delay = IEEE80211_CHANNEL_TIME;
834 		}
835 
836 		/* Now, just wait a bit and we are all done! */
837 		wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work,
838 					 next_delay);
839 		return 0;
840 	} else {
841 		/* Do normal software scan */
842 		__set_bit(SCAN_SW_SCANNING, &local->scanning);
843 	}
844 
845 	ieee80211_recalc_idle(local);
846 
847 	if (hw_scan) {
848 		WARN_ON(!ieee80211_prep_hw_scan(sdata));
849 		rc = drv_hw_scan(local, sdata, local->hw_scan_req);
850 	} else {
851 		rc = ieee80211_start_sw_scan(local, sdata);
852 	}
853 
854 	if (rc) {
855 		kfree(local->hw_scan_req);
856 		local->hw_scan_req = NULL;
857 		local->scanning = 0;
858 
859 		ieee80211_recalc_idle(local);
860 
861 		local->scan_req = NULL;
862 		RCU_INIT_POINTER(local->scan_sdata, NULL);
863 	}
864 
865 	if (hw_scan && rc == 1) {
866 		/*
867 		 * we can't fall back to software for P2P-GO
868 		 * as it must update NoA etc.
869 		 */
870 		if (ieee80211_vif_type_p2p(&sdata->vif) ==
871 				NL80211_IFTYPE_P2P_GO)
872 			return -EOPNOTSUPP;
873 		hw_scan = false;
874 		goto again;
875 	}
876 
877 	return rc;
878 }
879 
880 static unsigned long
881 ieee80211_scan_get_channel_time(struct ieee80211_channel *chan)
882 {
883 	/*
884 	 * TODO: channel switching also consumes quite some time,
885 	 * add that delay as well to get a better estimation
886 	 */
887 	if (chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR))
888 		return IEEE80211_PASSIVE_CHANNEL_TIME;
889 	return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME;
890 }
891 
892 static void ieee80211_scan_state_decision(struct ieee80211_local *local,
893 					  unsigned long *next_delay)
894 {
895 	bool associated = false;
896 	bool tx_empty = true;
897 	bool bad_latency;
898 	struct ieee80211_sub_if_data *sdata;
899 	struct ieee80211_channel *next_chan;
900 	enum mac80211_scan_state next_scan_state;
901 	struct cfg80211_scan_request *scan_req;
902 
903 	lockdep_assert_wiphy(local->hw.wiphy);
904 
905 	/*
906 	 * check if at least one STA interface is associated,
907 	 * check if at least one STA interface has pending tx frames
908 	 * and grab the lowest used beacon interval
909 	 */
910 	list_for_each_entry(sdata, &local->interfaces, list) {
911 		if (!ieee80211_sdata_running(sdata))
912 			continue;
913 
914 		if (sdata->vif.type == NL80211_IFTYPE_STATION) {
915 			if (sdata->u.mgd.associated) {
916 				associated = true;
917 
918 				if (!qdisc_all_tx_empty(sdata->dev)) {
919 					tx_empty = false;
920 					break;
921 				}
922 			}
923 		}
924 	}
925 
926 	scan_req = rcu_dereference_protected(local->scan_req,
927 					     lockdep_is_held(&local->hw.wiphy->mtx));
928 
929 	next_chan = scan_req->channels[local->scan_channel_idx];
930 
931 	/*
932 	 * we're currently scanning a different channel, let's
933 	 * see if we can scan another channel without interfering
934 	 * with the current traffic situation.
935 	 *
936 	 * Keep good latency, do not stay off-channel more than 125 ms.
937 	 */
938 
939 	bad_latency = time_after(jiffies +
940 				 ieee80211_scan_get_channel_time(next_chan),
941 				 local->leave_oper_channel_time + HZ / 8);
942 
943 	if (associated && !tx_empty) {
944 		if (scan_req->flags & NL80211_SCAN_FLAG_LOW_PRIORITY)
945 			next_scan_state = SCAN_ABORT;
946 		else
947 			next_scan_state = SCAN_SUSPEND;
948 	} else if (associated && bad_latency) {
949 		next_scan_state = SCAN_SUSPEND;
950 	} else {
951 		next_scan_state = SCAN_SET_CHANNEL;
952 	}
953 
954 	local->next_scan_state = next_scan_state;
955 
956 	*next_delay = 0;
957 }
958 
959 static void ieee80211_scan_state_set_channel(struct ieee80211_local *local,
960 					     unsigned long *next_delay)
961 {
962 	int skip;
963 	struct ieee80211_channel *chan;
964 	struct cfg80211_scan_request *scan_req;
965 
966 	scan_req = rcu_dereference_protected(local->scan_req,
967 					     lockdep_is_held(&local->hw.wiphy->mtx));
968 
969 	skip = 0;
970 	chan = scan_req->channels[local->scan_channel_idx];
971 
972 	local->scan_chandef.chan = chan;
973 	local->scan_chandef.center_freq1 = chan->center_freq;
974 	local->scan_chandef.freq1_offset = chan->freq_offset;
975 	local->scan_chandef.center_freq2 = 0;
976 
977 	/* For scanning on the S1G band, detect the channel width according to
978 	 * the channel being scanned.
979 	 */
980 	if (chan->band == NL80211_BAND_S1GHZ) {
981 		local->scan_chandef.width = ieee80211_s1g_channel_width(chan);
982 		goto set_channel;
983 	}
984 
985 	/* If scanning on oper channel, use whatever channel-type
986 	 * is currently in use.
987 	 */
988 	if (chan == local->hw.conf.chandef.chan)
989 		local->scan_chandef = local->hw.conf.chandef;
990 	else
991 		local->scan_chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
992 
993 set_channel:
994 	if (ieee80211_hw_conf_chan(local))
995 		skip = 1;
996 
997 	/* advance state machine to next channel/band */
998 	local->scan_channel_idx++;
999 
1000 	if (skip) {
1001 		/* if we skip this channel return to the decision state */
1002 		local->next_scan_state = SCAN_DECISION;
1003 		return;
1004 	}
1005 
1006 	/*
1007 	 * Probe delay is used to update the NAV, cf. 11.1.3.2.2
1008 	 * (which unfortunately doesn't say _why_ step a) is done,
1009 	 * but it waits for the probe delay or until a frame is
1010 	 * received - and the received frame would update the NAV).
1011 	 * For now, we do not support waiting until a frame is
1012 	 * received.
1013 	 *
1014 	 * In any case, it is not necessary for a passive scan.
1015 	 */
1016 	if ((chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR)) ||
1017 	    !scan_req->n_ssids) {
1018 		*next_delay = max(msecs_to_jiffies(scan_req->duration),
1019 				  IEEE80211_PASSIVE_CHANNEL_TIME);
1020 		local->next_scan_state = SCAN_DECISION;
1021 		if (scan_req->n_ssids)
1022 			set_bit(SCAN_BEACON_WAIT, &local->scanning);
1023 		return;
1024 	}
1025 
1026 	/* active scan, send probes */
1027 	*next_delay = IEEE80211_PROBE_DELAY;
1028 	local->next_scan_state = SCAN_SEND_PROBE;
1029 }
1030 
1031 static void ieee80211_scan_state_suspend(struct ieee80211_local *local,
1032 					 unsigned long *next_delay)
1033 {
1034 	/* switch back to the operating channel */
1035 	local->scan_chandef.chan = NULL;
1036 	ieee80211_hw_conf_chan(local);
1037 
1038 	/* disable PS */
1039 	ieee80211_offchannel_return(local);
1040 
1041 	*next_delay = HZ / 5;
1042 	/* afterwards, resume scan & go to next channel */
1043 	local->next_scan_state = SCAN_RESUME;
1044 }
1045 
1046 static void ieee80211_scan_state_resume(struct ieee80211_local *local,
1047 					unsigned long *next_delay)
1048 {
1049 	ieee80211_offchannel_stop_vifs(local);
1050 
1051 	if (local->ops->flush) {
1052 		ieee80211_flush_queues(local, NULL, false);
1053 		*next_delay = 0;
1054 	} else
1055 		*next_delay = HZ / 10;
1056 
1057 	/* remember when we left the operating channel */
1058 	local->leave_oper_channel_time = jiffies;
1059 
1060 	/* advance to the next channel to be scanned */
1061 	local->next_scan_state = SCAN_SET_CHANNEL;
1062 }
1063 
1064 void ieee80211_scan_work(struct wiphy *wiphy, struct wiphy_work *work)
1065 {
1066 	struct ieee80211_local *local =
1067 		container_of(work, struct ieee80211_local, scan_work.work);
1068 	struct ieee80211_sub_if_data *sdata;
1069 	struct cfg80211_scan_request *scan_req;
1070 	unsigned long next_delay = 0;
1071 	bool aborted;
1072 
1073 	lockdep_assert_wiphy(local->hw.wiphy);
1074 
1075 	if (!ieee80211_can_run_worker(local)) {
1076 		aborted = true;
1077 		goto out_complete;
1078 	}
1079 
1080 	sdata = rcu_dereference_protected(local->scan_sdata,
1081 					  lockdep_is_held(&local->hw.wiphy->mtx));
1082 	scan_req = rcu_dereference_protected(local->scan_req,
1083 					     lockdep_is_held(&local->hw.wiphy->mtx));
1084 
1085 	/* When scanning on-channel, the first-callback means completed. */
1086 	if (test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning)) {
1087 		aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning);
1088 		goto out_complete;
1089 	}
1090 
1091 	if (test_and_clear_bit(SCAN_COMPLETED, &local->scanning)) {
1092 		aborted = test_and_clear_bit(SCAN_ABORTED, &local->scanning);
1093 		goto out_complete;
1094 	}
1095 
1096 	if (!sdata || !scan_req)
1097 		return;
1098 
1099 	if (!local->scanning) {
1100 		int rc;
1101 
1102 		RCU_INIT_POINTER(local->scan_req, NULL);
1103 		RCU_INIT_POINTER(local->scan_sdata, NULL);
1104 
1105 		rc = __ieee80211_start_scan(sdata, scan_req);
1106 		if (!rc)
1107 			return;
1108 		/* need to complete scan in cfg80211 */
1109 		rcu_assign_pointer(local->scan_req, scan_req);
1110 		aborted = true;
1111 		goto out_complete;
1112 	}
1113 
1114 	clear_bit(SCAN_BEACON_WAIT, &local->scanning);
1115 
1116 	/*
1117 	 * as long as no delay is required advance immediately
1118 	 * without scheduling a new work
1119 	 */
1120 	do {
1121 		if (!ieee80211_sdata_running(sdata)) {
1122 			aborted = true;
1123 			goto out_complete;
1124 		}
1125 
1126 		if (test_and_clear_bit(SCAN_BEACON_DONE, &local->scanning) &&
1127 		    local->next_scan_state == SCAN_DECISION)
1128 			local->next_scan_state = SCAN_SEND_PROBE;
1129 
1130 		switch (local->next_scan_state) {
1131 		case SCAN_DECISION:
1132 			/* if no more bands/channels left, complete scan */
1133 			if (local->scan_channel_idx >= scan_req->n_channels) {
1134 				aborted = false;
1135 				goto out_complete;
1136 			}
1137 			ieee80211_scan_state_decision(local, &next_delay);
1138 			break;
1139 		case SCAN_SET_CHANNEL:
1140 			ieee80211_scan_state_set_channel(local, &next_delay);
1141 			break;
1142 		case SCAN_SEND_PROBE:
1143 			ieee80211_scan_state_send_probe(local, &next_delay);
1144 			break;
1145 		case SCAN_SUSPEND:
1146 			ieee80211_scan_state_suspend(local, &next_delay);
1147 			break;
1148 		case SCAN_RESUME:
1149 			ieee80211_scan_state_resume(local, &next_delay);
1150 			break;
1151 		case SCAN_ABORT:
1152 			aborted = true;
1153 			goto out_complete;
1154 		}
1155 	} while (next_delay == 0);
1156 
1157 	wiphy_delayed_work_queue(local->hw.wiphy, &local->scan_work,
1158 				 next_delay);
1159 	return;
1160 
1161 out_complete:
1162 	__ieee80211_scan_completed(&local->hw, aborted);
1163 }
1164 
1165 int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata,
1166 			   struct cfg80211_scan_request *req)
1167 {
1168 	lockdep_assert_wiphy(sdata->local->hw.wiphy);
1169 
1170 	return __ieee80211_start_scan(sdata, req);
1171 }
1172 
1173 int ieee80211_request_ibss_scan(struct ieee80211_sub_if_data *sdata,
1174 				const u8 *ssid, u8 ssid_len,
1175 				struct ieee80211_channel **channels,
1176 				unsigned int n_channels)
1177 {
1178 	struct ieee80211_local *local = sdata->local;
1179 	int ret = -EBUSY, i, n_ch = 0;
1180 	enum nl80211_band band;
1181 
1182 	lockdep_assert_wiphy(local->hw.wiphy);
1183 
1184 	/* busy scanning */
1185 	if (local->scan_req)
1186 		goto unlock;
1187 
1188 	/* fill internal scan request */
1189 	if (!channels) {
1190 		int max_n;
1191 
1192 		for (band = 0; band < NUM_NL80211_BANDS; band++) {
1193 			if (!local->hw.wiphy->bands[band] ||
1194 			    band == NL80211_BAND_6GHZ)
1195 				continue;
1196 
1197 			max_n = local->hw.wiphy->bands[band]->n_channels;
1198 			for (i = 0; i < max_n; i++) {
1199 				struct ieee80211_channel *tmp_ch =
1200 				    &local->hw.wiphy->bands[band]->channels[i];
1201 
1202 				if (tmp_ch->flags & (IEEE80211_CHAN_NO_IR |
1203 						     IEEE80211_CHAN_DISABLED))
1204 					continue;
1205 
1206 				local->int_scan_req->channels[n_ch] = tmp_ch;
1207 				n_ch++;
1208 			}
1209 		}
1210 
1211 		if (WARN_ON_ONCE(n_ch == 0))
1212 			goto unlock;
1213 
1214 		local->int_scan_req->n_channels = n_ch;
1215 	} else {
1216 		for (i = 0; i < n_channels; i++) {
1217 			if (channels[i]->flags & (IEEE80211_CHAN_NO_IR |
1218 						  IEEE80211_CHAN_DISABLED))
1219 				continue;
1220 
1221 			local->int_scan_req->channels[n_ch] = channels[i];
1222 			n_ch++;
1223 		}
1224 
1225 		if (WARN_ON_ONCE(n_ch == 0))
1226 			goto unlock;
1227 
1228 		local->int_scan_req->n_channels = n_ch;
1229 	}
1230 
1231 	local->int_scan_req->ssids = &local->scan_ssid;
1232 	local->int_scan_req->n_ssids = 1;
1233 	memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN);
1234 	local->int_scan_req->ssids[0].ssid_len = ssid_len;
1235 
1236 	ret = __ieee80211_start_scan(sdata, sdata->local->int_scan_req);
1237  unlock:
1238 	return ret;
1239 }
1240 
1241 void ieee80211_scan_cancel(struct ieee80211_local *local)
1242 {
1243 	/* ensure a new scan cannot be queued */
1244 	lockdep_assert_wiphy(local->hw.wiphy);
1245 
1246 	/*
1247 	 * We are canceling software scan, or deferred scan that was not
1248 	 * yet really started (see __ieee80211_start_scan ).
1249 	 *
1250 	 * Regarding hardware scan:
1251 	 * - we can not call  __ieee80211_scan_completed() as when
1252 	 *   SCAN_HW_SCANNING bit is set this function change
1253 	 *   local->hw_scan_req to operate on 5G band, what race with
1254 	 *   driver which can use local->hw_scan_req
1255 	 *
1256 	 * - we can not cancel scan_work since driver can schedule it
1257 	 *   by ieee80211_scan_completed(..., true) to finish scan
1258 	 *
1259 	 * Hence we only call the cancel_hw_scan() callback, but the low-level
1260 	 * driver is still responsible for calling ieee80211_scan_completed()
1261 	 * after the scan was completed/aborted.
1262 	 */
1263 
1264 	if (!local->scan_req)
1265 		return;
1266 
1267 	/*
1268 	 * We have a scan running and the driver already reported completion,
1269 	 * but the worker hasn't run yet or is stuck on the mutex - mark it as
1270 	 * cancelled.
1271 	 */
1272 	if (test_bit(SCAN_HW_SCANNING, &local->scanning) &&
1273 	    test_bit(SCAN_COMPLETED, &local->scanning)) {
1274 		set_bit(SCAN_HW_CANCELLED, &local->scanning);
1275 		return;
1276 	}
1277 
1278 	if (test_bit(SCAN_HW_SCANNING, &local->scanning)) {
1279 		/*
1280 		 * Make sure that __ieee80211_scan_completed doesn't trigger a
1281 		 * scan on another band.
1282 		 */
1283 		set_bit(SCAN_HW_CANCELLED, &local->scanning);
1284 		if (local->ops->cancel_hw_scan)
1285 			drv_cancel_hw_scan(local,
1286 				rcu_dereference_protected(local->scan_sdata,
1287 						lockdep_is_held(&local->hw.wiphy->mtx)));
1288 		return;
1289 	}
1290 
1291 	wiphy_delayed_work_cancel(local->hw.wiphy, &local->scan_work);
1292 	/* and clean up */
1293 	memset(&local->scan_info, 0, sizeof(local->scan_info));
1294 	__ieee80211_scan_completed(&local->hw, true);
1295 }
1296 
1297 int __ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata,
1298 					struct cfg80211_sched_scan_request *req)
1299 {
1300 	struct ieee80211_local *local = sdata->local;
1301 	struct ieee80211_scan_ies sched_scan_ies = {};
1302 	struct cfg80211_chan_def chandef;
1303 	int ret, i, iebufsz, num_bands = 0;
1304 	u32 rate_masks[NUM_NL80211_BANDS] = {};
1305 	u8 bands_used = 0;
1306 	u8 *ie;
1307 	u32 flags = 0;
1308 
1309 	lockdep_assert_wiphy(local->hw.wiphy);
1310 
1311 	iebufsz = local->scan_ies_len + req->ie_len;
1312 
1313 	if (!local->ops->sched_scan_start)
1314 		return -EOPNOTSUPP;
1315 
1316 	for (i = 0; i < NUM_NL80211_BANDS; i++) {
1317 		if (local->hw.wiphy->bands[i]) {
1318 			bands_used |= BIT(i);
1319 			rate_masks[i] = (u32) -1;
1320 			num_bands++;
1321 		}
1322 	}
1323 
1324 	if (req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT)
1325 		flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT;
1326 
1327 	ie = kcalloc(iebufsz, num_bands, GFP_KERNEL);
1328 	if (!ie) {
1329 		ret = -ENOMEM;
1330 		goto out;
1331 	}
1332 
1333 	ieee80211_prepare_scan_chandef(&chandef);
1334 
1335 	ret = ieee80211_build_preq_ies(sdata, ie, num_bands * iebufsz,
1336 				       &sched_scan_ies, req->ie,
1337 				       req->ie_len, bands_used, rate_masks,
1338 				       &chandef, flags);
1339 	if (ret < 0)
1340 		goto error;
1341 
1342 	ret = drv_sched_scan_start(local, sdata, req, &sched_scan_ies);
1343 	if (ret == 0) {
1344 		rcu_assign_pointer(local->sched_scan_sdata, sdata);
1345 		rcu_assign_pointer(local->sched_scan_req, req);
1346 	}
1347 
1348 error:
1349 	kfree(ie);
1350 out:
1351 	if (ret) {
1352 		/* Clean in case of failure after HW restart or upon resume. */
1353 		RCU_INIT_POINTER(local->sched_scan_sdata, NULL);
1354 		RCU_INIT_POINTER(local->sched_scan_req, NULL);
1355 	}
1356 
1357 	return ret;
1358 }
1359 
1360 int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata,
1361 				       struct cfg80211_sched_scan_request *req)
1362 {
1363 	struct ieee80211_local *local = sdata->local;
1364 
1365 	lockdep_assert_wiphy(local->hw.wiphy);
1366 
1367 	if (rcu_access_pointer(local->sched_scan_sdata))
1368 		return -EBUSY;
1369 
1370 	return __ieee80211_request_sched_scan_start(sdata, req);
1371 }
1372 
1373 int ieee80211_request_sched_scan_stop(struct ieee80211_local *local)
1374 {
1375 	struct ieee80211_sub_if_data *sched_scan_sdata;
1376 	int ret = -ENOENT;
1377 
1378 	lockdep_assert_wiphy(local->hw.wiphy);
1379 
1380 	if (!local->ops->sched_scan_stop)
1381 		return -EOPNOTSUPP;
1382 
1383 	/* We don't want to restart sched scan anymore. */
1384 	RCU_INIT_POINTER(local->sched_scan_req, NULL);
1385 
1386 	sched_scan_sdata = rcu_dereference_protected(local->sched_scan_sdata,
1387 						lockdep_is_held(&local->hw.wiphy->mtx));
1388 	if (sched_scan_sdata) {
1389 		ret = drv_sched_scan_stop(local, sched_scan_sdata);
1390 		if (!ret)
1391 			RCU_INIT_POINTER(local->sched_scan_sdata, NULL);
1392 	}
1393 
1394 	return ret;
1395 }
1396 
1397 void ieee80211_sched_scan_results(struct ieee80211_hw *hw)
1398 {
1399 	struct ieee80211_local *local = hw_to_local(hw);
1400 
1401 	trace_api_sched_scan_results(local);
1402 
1403 	cfg80211_sched_scan_results(hw->wiphy, 0);
1404 }
1405 EXPORT_SYMBOL(ieee80211_sched_scan_results);
1406 
1407 void ieee80211_sched_scan_end(struct ieee80211_local *local)
1408 {
1409 	lockdep_assert_wiphy(local->hw.wiphy);
1410 
1411 	if (!rcu_access_pointer(local->sched_scan_sdata))
1412 		return;
1413 
1414 	RCU_INIT_POINTER(local->sched_scan_sdata, NULL);
1415 
1416 	/* If sched scan was aborted by the driver. */
1417 	RCU_INIT_POINTER(local->sched_scan_req, NULL);
1418 
1419 	cfg80211_sched_scan_stopped_locked(local->hw.wiphy, 0);
1420 }
1421 
1422 void ieee80211_sched_scan_stopped_work(struct wiphy *wiphy,
1423 				       struct wiphy_work *work)
1424 {
1425 	struct ieee80211_local *local =
1426 		container_of(work, struct ieee80211_local,
1427 			     sched_scan_stopped_work);
1428 
1429 	ieee80211_sched_scan_end(local);
1430 }
1431 
1432 void ieee80211_sched_scan_stopped(struct ieee80211_hw *hw)
1433 {
1434 	struct ieee80211_local *local = hw_to_local(hw);
1435 
1436 	trace_api_sched_scan_stopped(local);
1437 
1438 	/*
1439 	 * this shouldn't really happen, so for simplicity
1440 	 * simply ignore it, and let mac80211 reconfigure
1441 	 * the sched scan later on.
1442 	 */
1443 	if (local->in_reconfig)
1444 		return;
1445 
1446 	wiphy_work_queue(hw->wiphy, &local->sched_scan_stopped_work);
1447 }
1448 EXPORT_SYMBOL(ieee80211_sched_scan_stopped);
1449