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) 2018-2023 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(wiphy: 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(start: ies->data, len: ies->len, action: 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(objp: 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(fc: mgmt->frame_control) ||
170 ieee80211_is_s1g_beacon(fc: 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(status: rx_status)) {
197 bss_meta.parent_tsf =
198 ieee80211_calculate_rx_timestamp(local, status: rx_status,
199 mpdu_len: len + FCS_LEN, mpdu_offset: 24);
200 ether_addr_copy(dst: bss_meta.parent_bssid,
201 src: scan_sdata->vif.bss_conf.bssid);
202 }
203 rcu_read_unlock();
204
205 cbss = cfg80211_inform_bss_frame_data(wiphy: local->hw.wiphy, data: &bss_meta,
206 mgmt, len, GFP_ATOMIC);
207 if (!cbss)
208 return NULL;
209
210 /* In case the signal is invalid update the status */
211 signal_valid = channel == cbss->channel;
212 if (!signal_valid)
213 rx_status->flag |= RX_FLAG_NO_SIGNAL_VAL;
214
215 return (void *)cbss->priv;
216}
217
218static bool ieee80211_scan_accept_presp(struct ieee80211_sub_if_data *sdata,
219 u32 scan_flags, const u8 *da)
220{
221 if (!sdata)
222 return false;
223 /* accept broadcast for OCE */
224 if (scan_flags & NL80211_SCAN_FLAG_ACCEPT_BCAST_PROBE_RESP &&
225 is_broadcast_ether_addr(addr: da))
226 return true;
227 if (scan_flags & NL80211_SCAN_FLAG_RANDOM_ADDR)
228 return true;
229 return ether_addr_equal(addr1: da, addr2: sdata->vif.addr);
230}
231
232void ieee80211_scan_rx(struct ieee80211_local *local, struct sk_buff *skb)
233{
234 struct ieee80211_rx_status *rx_status = IEEE80211_SKB_RXCB(skb);
235 struct ieee80211_sub_if_data *sdata1, *sdata2;
236 struct ieee80211_mgmt *mgmt = (void *)skb->data;
237 struct ieee80211_bss *bss;
238 struct ieee80211_channel *channel;
239 size_t min_hdr_len = offsetof(struct ieee80211_mgmt,
240 u.probe_resp.variable);
241
242 if (!ieee80211_is_probe_resp(fc: mgmt->frame_control) &&
243 !ieee80211_is_beacon(fc: mgmt->frame_control) &&
244 !ieee80211_is_s1g_beacon(fc: mgmt->frame_control))
245 return;
246
247 if (ieee80211_is_s1g_beacon(fc: mgmt->frame_control)) {
248 if (ieee80211_is_s1g_short_beacon(fc: mgmt->frame_control))
249 min_hdr_len = offsetof(struct ieee80211_ext,
250 u.s1g_short_beacon.variable);
251 else
252 min_hdr_len = offsetof(struct ieee80211_ext,
253 u.s1g_beacon);
254 }
255
256 if (skb->len < min_hdr_len)
257 return;
258
259 sdata1 = rcu_dereference(local->scan_sdata);
260 sdata2 = rcu_dereference(local->sched_scan_sdata);
261
262 if (likely(!sdata1 && !sdata2))
263 return;
264
265 if (test_and_clear_bit(nr: SCAN_BEACON_WAIT, addr: &local->scanning)) {
266 /*
267 * we were passive scanning because of radar/no-IR, but
268 * the beacon/proberesp rx gives us an opportunity to upgrade
269 * to active scan
270 */
271 set_bit(nr: SCAN_BEACON_DONE, addr: &local->scanning);
272 wiphy_delayed_work_queue(wiphy: local->hw.wiphy, dwork: &local->scan_work, delay: 0);
273 }
274
275 if (ieee80211_is_probe_resp(fc: mgmt->frame_control)) {
276 struct cfg80211_scan_request *scan_req;
277 struct cfg80211_sched_scan_request *sched_scan_req;
278 u32 scan_req_flags = 0, sched_scan_req_flags = 0;
279
280 scan_req = rcu_dereference(local->scan_req);
281 sched_scan_req = rcu_dereference(local->sched_scan_req);
282
283 if (scan_req)
284 scan_req_flags = scan_req->flags;
285
286 if (sched_scan_req)
287 sched_scan_req_flags = sched_scan_req->flags;
288
289 /* ignore ProbeResp to foreign address or non-bcast (OCE)
290 * unless scanning with randomised address
291 */
292 if (!ieee80211_scan_accept_presp(sdata: sdata1, scan_flags: scan_req_flags,
293 da: mgmt->da) &&
294 !ieee80211_scan_accept_presp(sdata: sdata2, scan_flags: sched_scan_req_flags,
295 da: mgmt->da))
296 return;
297 }
298
299 channel = ieee80211_get_channel_khz(wiphy: local->hw.wiphy,
300 freq: ieee80211_rx_status_to_khz(rx_status));
301
302 if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
303 return;
304
305 bss = ieee80211_bss_info_update(local, rx_status,
306 mgmt, len: skb->len,
307 channel);
308 if (bss)
309 ieee80211_rx_bss_put(local, bss);
310}
311
312static void ieee80211_prepare_scan_chandef(struct cfg80211_chan_def *chandef)
313{
314 memset(chandef, 0, sizeof(*chandef));
315
316 chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
317}
318
319/* return false if no more work */
320static bool ieee80211_prep_hw_scan(struct ieee80211_sub_if_data *sdata)
321{
322 struct ieee80211_local *local = sdata->local;
323 struct cfg80211_scan_request *req;
324 struct cfg80211_chan_def chandef;
325 u8 bands_used = 0;
326 int i, ielen, n_chans;
327 u32 flags = 0;
328
329 req = rcu_dereference_protected(local->scan_req,
330 lockdep_is_held(&local->hw.wiphy->mtx));
331
332 if (test_bit(SCAN_HW_CANCELLED, &local->scanning))
333 return false;
334
335 if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) {
336 for (i = 0; i < req->n_channels; i++) {
337 local->hw_scan_req->req.channels[i] = req->channels[i];
338 bands_used |= BIT(req->channels[i]->band);
339 }
340
341 n_chans = req->n_channels;
342 } else {
343 do {
344 if (local->hw_scan_band == NUM_NL80211_BANDS)
345 return false;
346
347 n_chans = 0;
348
349 for (i = 0; i < req->n_channels; i++) {
350 if (req->channels[i]->band !=
351 local->hw_scan_band)
352 continue;
353 local->hw_scan_req->req.channels[n_chans] =
354 req->channels[i];
355 n_chans++;
356 bands_used |= BIT(req->channels[i]->band);
357 }
358
359 local->hw_scan_band++;
360 } while (!n_chans);
361 }
362
363 local->hw_scan_req->req.n_channels = n_chans;
364 ieee80211_prepare_scan_chandef(chandef: &chandef);
365
366 if (req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT)
367 flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT;
368
369 ielen = ieee80211_build_preq_ies(sdata,
370 buffer: (u8 *)local->hw_scan_req->req.ie,
371 buffer_len: local->hw_scan_ies_bufsize,
372 ie_desc: &local->hw_scan_req->ies,
373 ie: req->ie, ie_len: req->ie_len,
374 bands_used, rate_masks: req->rates, chandef: &chandef,
375 flags);
376 local->hw_scan_req->req.ie_len = ielen;
377 local->hw_scan_req->req.no_cck = req->no_cck;
378 ether_addr_copy(dst: local->hw_scan_req->req.mac_addr, src: req->mac_addr);
379 ether_addr_copy(dst: local->hw_scan_req->req.mac_addr_mask,
380 src: req->mac_addr_mask);
381 ether_addr_copy(dst: local->hw_scan_req->req.bssid, src: req->bssid);
382
383 return true;
384}
385
386static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted)
387{
388 struct ieee80211_local *local = hw_to_local(hw);
389 bool hw_scan = test_bit(SCAN_HW_SCANNING, &local->scanning);
390 bool was_scanning = local->scanning;
391 struct cfg80211_scan_request *scan_req;
392 struct ieee80211_sub_if_data *scan_sdata;
393 struct ieee80211_sub_if_data *sdata;
394
395 lockdep_assert_wiphy(local->hw.wiphy);
396
397 /*
398 * It's ok to abort a not-yet-running scan (that
399 * we have one at all will be verified by checking
400 * local->scan_req next), but not to complete it
401 * successfully.
402 */
403 if (WARN_ON(!local->scanning && !aborted))
404 aborted = true;
405
406 if (WARN_ON(!local->scan_req))
407 return;
408
409 scan_sdata = rcu_dereference_protected(local->scan_sdata,
410 lockdep_is_held(&local->hw.wiphy->mtx));
411
412 if (hw_scan && !aborted &&
413 !ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS) &&
414 ieee80211_prep_hw_scan(sdata: scan_sdata)) {
415 int rc;
416
417 rc = drv_hw_scan(local,
418 rcu_dereference_protected(local->scan_sdata,
419 lockdep_is_held(&local->hw.wiphy->mtx)),
420 req: local->hw_scan_req);
421
422 if (rc == 0)
423 return;
424
425 /* HW scan failed and is going to be reported as aborted,
426 * so clear old scan info.
427 */
428 memset(&local->scan_info, 0, sizeof(local->scan_info));
429 aborted = true;
430 }
431
432 kfree(objp: local->hw_scan_req);
433 local->hw_scan_req = NULL;
434
435 scan_req = rcu_dereference_protected(local->scan_req,
436 lockdep_is_held(&local->hw.wiphy->mtx));
437
438 RCU_INIT_POINTER(local->scan_req, NULL);
439 RCU_INIT_POINTER(local->scan_sdata, NULL);
440
441 local->scanning = 0;
442 local->scan_chandef.chan = NULL;
443
444 synchronize_rcu();
445
446 if (scan_req != local->int_scan_req) {
447 local->scan_info.aborted = aborted;
448 cfg80211_scan_done(request: scan_req, info: &local->scan_info);
449 }
450
451 /* Set power back to normal operating levels. */
452 ieee80211_hw_config(local, changed: 0);
453
454 if (!hw_scan && was_scanning) {
455 ieee80211_configure_filter(local);
456 drv_sw_scan_complete(local, sdata: scan_sdata);
457 ieee80211_offchannel_return(local);
458 }
459
460 ieee80211_recalc_idle(local);
461
462 ieee80211_mlme_notify_scan_completed(local);
463 ieee80211_ibss_notify_scan_completed(local);
464
465 /* Requeue all the work that might have been ignored while
466 * the scan was in progress; if there was none this will
467 * just be a no-op for the particular interface.
468 */
469 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
470 if (ieee80211_sdata_running(sdata))
471 wiphy_work_queue(wiphy: sdata->local->hw.wiphy, work: &sdata->work);
472 }
473
474 if (was_scanning)
475 ieee80211_start_next_roc(local);
476}
477
478void ieee80211_scan_completed(struct ieee80211_hw *hw,
479 struct cfg80211_scan_info *info)
480{
481 struct ieee80211_local *local = hw_to_local(hw);
482
483 trace_api_scan_completed(local, aborted: info->aborted);
484
485 set_bit(nr: SCAN_COMPLETED, addr: &local->scanning);
486 if (info->aborted)
487 set_bit(nr: SCAN_ABORTED, addr: &local->scanning);
488
489 memcpy(&local->scan_info, info, sizeof(*info));
490
491 wiphy_delayed_work_queue(wiphy: local->hw.wiphy, dwork: &local->scan_work, delay: 0);
492}
493EXPORT_SYMBOL(ieee80211_scan_completed);
494
495static int ieee80211_start_sw_scan(struct ieee80211_local *local,
496 struct ieee80211_sub_if_data *sdata)
497{
498 /* Software scan is not supported in multi-channel cases */
499 if (local->use_chanctx)
500 return -EOPNOTSUPP;
501
502 /*
503 * Hardware/driver doesn't support hw_scan, so use software
504 * scanning instead. First send a nullfunc frame with power save
505 * bit on so that AP will buffer the frames for us while we are not
506 * listening, then send probe requests to each channel and wait for
507 * the responses. After all channels are scanned, tune back to the
508 * original channel and send a nullfunc frame with power save bit
509 * off to trigger the AP to send us all the buffered frames.
510 *
511 * Note that while local->sw_scanning is true everything else but
512 * nullfunc frames and probe requests will be dropped in
513 * ieee80211_tx_h_check_assoc().
514 */
515 drv_sw_scan_start(local, sdata, mac_addr: local->scan_addr);
516
517 local->leave_oper_channel_time = jiffies;
518 local->next_scan_state = SCAN_DECISION;
519 local->scan_channel_idx = 0;
520
521 ieee80211_offchannel_stop_vifs(local);
522
523 /* ensure nullfunc is transmitted before leaving operating channel */
524 ieee80211_flush_queues(local, NULL, drop: false);
525
526 ieee80211_configure_filter(local);
527
528 /* We need to set power level at maximum rate for scanning. */
529 ieee80211_hw_config(local, changed: 0);
530
531 wiphy_delayed_work_queue(wiphy: local->hw.wiphy, dwork: &local->scan_work, delay: 0);
532
533 return 0;
534}
535
536static bool __ieee80211_can_leave_ch(struct ieee80211_sub_if_data *sdata)
537{
538 struct ieee80211_local *local = sdata->local;
539 struct ieee80211_sub_if_data *sdata_iter;
540
541 lockdep_assert_wiphy(local->hw.wiphy);
542
543 if (!ieee80211_is_radar_required(local))
544 return true;
545
546 if (!regulatory_pre_cac_allowed(wiphy: local->hw.wiphy))
547 return false;
548
549 list_for_each_entry(sdata_iter, &local->interfaces, list) {
550 if (sdata_iter->wdev.cac_started)
551 return false;
552 }
553
554 return true;
555}
556
557static bool ieee80211_can_scan(struct ieee80211_local *local,
558 struct ieee80211_sub_if_data *sdata)
559{
560 if (!__ieee80211_can_leave_ch(sdata))
561 return false;
562
563 if (!list_empty(head: &local->roc_list))
564 return false;
565
566 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
567 sdata->u.mgd.flags & IEEE80211_STA_CONNECTION_POLL)
568 return false;
569
570 return true;
571}
572
573void ieee80211_run_deferred_scan(struct ieee80211_local *local)
574{
575 lockdep_assert_wiphy(local->hw.wiphy);
576
577 if (!local->scan_req || local->scanning)
578 return;
579
580 if (!ieee80211_can_scan(local,
581 rcu_dereference_protected(
582 local->scan_sdata,
583 lockdep_is_held(&local->hw.wiphy->mtx))))
584 return;
585
586 wiphy_delayed_work_queue(wiphy: local->hw.wiphy, dwork: &local->scan_work,
587 delay: round_jiffies_relative(j: 0));
588}
589
590static void ieee80211_send_scan_probe_req(struct ieee80211_sub_if_data *sdata,
591 const u8 *src, const u8 *dst,
592 const u8 *ssid, size_t ssid_len,
593 const u8 *ie, size_t ie_len,
594 u32 ratemask, u32 flags, u32 tx_flags,
595 struct ieee80211_channel *channel)
596{
597 struct sk_buff *skb;
598
599 skb = ieee80211_build_probe_req(sdata, src, dst, ratemask, chan: channel,
600 ssid, ssid_len,
601 ie, ie_len, flags);
602
603 if (skb) {
604 if (flags & IEEE80211_PROBE_FLAG_RANDOM_SN) {
605 struct ieee80211_hdr *hdr = (void *)skb->data;
606 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
607 u16 sn = get_random_u16();
608
609 info->control.flags |= IEEE80211_TX_CTRL_NO_SEQNO;
610 hdr->seq_ctrl =
611 cpu_to_le16(IEEE80211_SN_TO_SEQ(sn));
612 }
613 IEEE80211_SKB_CB(skb)->flags |= tx_flags;
614 ieee80211_tx_skb_tid_band(sdata, skb, tid: 7, band: channel->band);
615 }
616}
617
618static void ieee80211_scan_state_send_probe(struct ieee80211_local *local,
619 unsigned long *next_delay)
620{
621 int i;
622 struct ieee80211_sub_if_data *sdata;
623 struct cfg80211_scan_request *scan_req;
624 enum nl80211_band band = local->hw.conf.chandef.chan->band;
625 u32 flags = 0, tx_flags;
626
627 scan_req = rcu_dereference_protected(local->scan_req,
628 lockdep_is_held(&local->hw.wiphy->mtx));
629
630 tx_flags = IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
631 if (scan_req->no_cck)
632 tx_flags |= IEEE80211_TX_CTL_NO_CCK_RATE;
633 if (scan_req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT)
634 flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT;
635 if (scan_req->flags & NL80211_SCAN_FLAG_RANDOM_SN)
636 flags |= IEEE80211_PROBE_FLAG_RANDOM_SN;
637
638 sdata = rcu_dereference_protected(local->scan_sdata,
639 lockdep_is_held(&local->hw.wiphy->mtx));
640
641 for (i = 0; i < scan_req->n_ssids; i++)
642 ieee80211_send_scan_probe_req(
643 sdata, src: local->scan_addr, dst: scan_req->bssid,
644 ssid: scan_req->ssids[i].ssid, ssid_len: scan_req->ssids[i].ssid_len,
645 ie: scan_req->ie, ie_len: scan_req->ie_len,
646 ratemask: scan_req->rates[band], flags,
647 tx_flags, channel: local->hw.conf.chandef.chan);
648
649 /*
650 * After sending probe requests, wait for probe responses
651 * on the channel.
652 */
653 *next_delay = IEEE80211_CHANNEL_TIME;
654 local->next_scan_state = SCAN_DECISION;
655}
656
657static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata,
658 struct cfg80211_scan_request *req)
659{
660 struct ieee80211_local *local = sdata->local;
661 bool hw_scan = local->ops->hw_scan;
662 int rc;
663
664 lockdep_assert_wiphy(local->hw.wiphy);
665
666 if (local->scan_req)
667 return -EBUSY;
668
669 if (!__ieee80211_can_leave_ch(sdata))
670 return -EBUSY;
671
672 if (!ieee80211_can_scan(local, sdata)) {
673 /* wait for the work to finish/time out */
674 rcu_assign_pointer(local->scan_req, req);
675 rcu_assign_pointer(local->scan_sdata, sdata);
676 return 0;
677 }
678
679 again:
680 if (hw_scan) {
681 u8 *ies;
682
683 local->hw_scan_ies_bufsize = local->scan_ies_len + req->ie_len;
684
685 if (ieee80211_hw_check(&local->hw, SINGLE_SCAN_ON_ALL_BANDS)) {
686 int i, n_bands = 0;
687 u8 bands_counted = 0;
688
689 for (i = 0; i < req->n_channels; i++) {
690 if (bands_counted & BIT(req->channels[i]->band))
691 continue;
692 bands_counted |= BIT(req->channels[i]->band);
693 n_bands++;
694 }
695
696 local->hw_scan_ies_bufsize *= n_bands;
697 }
698
699 local->hw_scan_req = kmalloc(
700 size: sizeof(*local->hw_scan_req) +
701 req->n_channels * sizeof(req->channels[0]) +
702 local->hw_scan_ies_bufsize, GFP_KERNEL);
703 if (!local->hw_scan_req)
704 return -ENOMEM;
705
706 local->hw_scan_req->req.ssids = req->ssids;
707 local->hw_scan_req->req.n_ssids = req->n_ssids;
708 ies = (u8 *)local->hw_scan_req +
709 sizeof(*local->hw_scan_req) +
710 req->n_channels * sizeof(req->channels[0]);
711 local->hw_scan_req->req.ie = ies;
712 local->hw_scan_req->req.flags = req->flags;
713 eth_broadcast_addr(addr: local->hw_scan_req->req.bssid);
714 local->hw_scan_req->req.duration = req->duration;
715 local->hw_scan_req->req.duration_mandatory =
716 req->duration_mandatory;
717
718 local->hw_scan_band = 0;
719 local->hw_scan_req->req.n_6ghz_params = req->n_6ghz_params;
720 local->hw_scan_req->req.scan_6ghz_params =
721 req->scan_6ghz_params;
722 local->hw_scan_req->req.scan_6ghz = req->scan_6ghz;
723
724 /*
725 * After allocating local->hw_scan_req, we must
726 * go through until ieee80211_prep_hw_scan(), so
727 * anything that might be changed here and leave
728 * this function early must not go after this
729 * allocation.
730 */
731 }
732
733 rcu_assign_pointer(local->scan_req, req);
734 rcu_assign_pointer(local->scan_sdata, sdata);
735
736 if (req->flags & NL80211_SCAN_FLAG_RANDOM_ADDR)
737 get_random_mask_addr(buf: local->scan_addr,
738 addr: req->mac_addr,
739 mask: req->mac_addr_mask);
740 else
741 memcpy(local->scan_addr, sdata->vif.addr, ETH_ALEN);
742
743 if (hw_scan) {
744 __set_bit(SCAN_HW_SCANNING, &local->scanning);
745 } else if ((req->n_channels == 1) &&
746 (req->channels[0] == local->_oper_chandef.chan)) {
747 /*
748 * If we are scanning only on the operating channel
749 * then we do not need to stop normal activities
750 */
751 unsigned long next_delay;
752
753 __set_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
754
755 ieee80211_recalc_idle(local);
756
757 /* Notify driver scan is starting, keep order of operations
758 * same as normal software scan, in case that matters. */
759 drv_sw_scan_start(local, sdata, mac_addr: local->scan_addr);
760
761 ieee80211_configure_filter(local); /* accept probe-responses */
762
763 /* We need to ensure power level is at max for scanning. */
764 ieee80211_hw_config(local, changed: 0);
765
766 if ((req->channels[0]->flags & (IEEE80211_CHAN_NO_IR |
767 IEEE80211_CHAN_RADAR)) ||
768 !req->n_ssids) {
769 next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
770 if (req->n_ssids)
771 set_bit(nr: SCAN_BEACON_WAIT, addr: &local->scanning);
772 } else {
773 ieee80211_scan_state_send_probe(local, next_delay: &next_delay);
774 next_delay = IEEE80211_CHANNEL_TIME;
775 }
776
777 /* Now, just wait a bit and we are all done! */
778 wiphy_delayed_work_queue(wiphy: local->hw.wiphy, dwork: &local->scan_work,
779 delay: next_delay);
780 return 0;
781 } else {
782 /* Do normal software scan */
783 __set_bit(SCAN_SW_SCANNING, &local->scanning);
784 }
785
786 ieee80211_recalc_idle(local);
787
788 if (hw_scan) {
789 WARN_ON(!ieee80211_prep_hw_scan(sdata));
790 rc = drv_hw_scan(local, sdata, req: local->hw_scan_req);
791 } else {
792 rc = ieee80211_start_sw_scan(local, sdata);
793 }
794
795 if (rc) {
796 kfree(objp: local->hw_scan_req);
797 local->hw_scan_req = NULL;
798 local->scanning = 0;
799
800 ieee80211_recalc_idle(local);
801
802 local->scan_req = NULL;
803 RCU_INIT_POINTER(local->scan_sdata, NULL);
804 }
805
806 if (hw_scan && rc == 1) {
807 /*
808 * we can't fall back to software for P2P-GO
809 * as it must update NoA etc.
810 */
811 if (ieee80211_vif_type_p2p(vif: &sdata->vif) ==
812 NL80211_IFTYPE_P2P_GO)
813 return -EOPNOTSUPP;
814 hw_scan = false;
815 goto again;
816 }
817
818 return rc;
819}
820
821static unsigned long
822ieee80211_scan_get_channel_time(struct ieee80211_channel *chan)
823{
824 /*
825 * TODO: channel switching also consumes quite some time,
826 * add that delay as well to get a better estimation
827 */
828 if (chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR))
829 return IEEE80211_PASSIVE_CHANNEL_TIME;
830 return IEEE80211_PROBE_DELAY + IEEE80211_CHANNEL_TIME;
831}
832
833static void ieee80211_scan_state_decision(struct ieee80211_local *local,
834 unsigned long *next_delay)
835{
836 bool associated = false;
837 bool tx_empty = true;
838 bool bad_latency;
839 struct ieee80211_sub_if_data *sdata;
840 struct ieee80211_channel *next_chan;
841 enum mac80211_scan_state next_scan_state;
842 struct cfg80211_scan_request *scan_req;
843
844 lockdep_assert_wiphy(local->hw.wiphy);
845
846 /*
847 * check if at least one STA interface is associated,
848 * check if at least one STA interface has pending tx frames
849 * and grab the lowest used beacon interval
850 */
851 list_for_each_entry(sdata, &local->interfaces, list) {
852 if (!ieee80211_sdata_running(sdata))
853 continue;
854
855 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
856 if (sdata->u.mgd.associated) {
857 associated = true;
858
859 if (!qdisc_all_tx_empty(dev: sdata->dev)) {
860 tx_empty = false;
861 break;
862 }
863 }
864 }
865 }
866
867 scan_req = rcu_dereference_protected(local->scan_req,
868 lockdep_is_held(&local->hw.wiphy->mtx));
869
870 next_chan = scan_req->channels[local->scan_channel_idx];
871
872 /*
873 * we're currently scanning a different channel, let's
874 * see if we can scan another channel without interfering
875 * with the current traffic situation.
876 *
877 * Keep good latency, do not stay off-channel more than 125 ms.
878 */
879
880 bad_latency = time_after(jiffies +
881 ieee80211_scan_get_channel_time(next_chan),
882 local->leave_oper_channel_time + HZ / 8);
883
884 if (associated && !tx_empty) {
885 if (scan_req->flags & NL80211_SCAN_FLAG_LOW_PRIORITY)
886 next_scan_state = SCAN_ABORT;
887 else
888 next_scan_state = SCAN_SUSPEND;
889 } else if (associated && bad_latency) {
890 next_scan_state = SCAN_SUSPEND;
891 } else {
892 next_scan_state = SCAN_SET_CHANNEL;
893 }
894
895 local->next_scan_state = next_scan_state;
896
897 *next_delay = 0;
898}
899
900static void ieee80211_scan_state_set_channel(struct ieee80211_local *local,
901 unsigned long *next_delay)
902{
903 int skip;
904 struct ieee80211_channel *chan;
905 struct cfg80211_scan_request *scan_req;
906
907 scan_req = rcu_dereference_protected(local->scan_req,
908 lockdep_is_held(&local->hw.wiphy->mtx));
909
910 skip = 0;
911 chan = scan_req->channels[local->scan_channel_idx];
912
913 local->scan_chandef.chan = chan;
914 local->scan_chandef.center_freq1 = chan->center_freq;
915 local->scan_chandef.freq1_offset = chan->freq_offset;
916 local->scan_chandef.center_freq2 = 0;
917
918 /* For scanning on the S1G band, detect the channel width according to
919 * the channel being scanned.
920 */
921 if (chan->band == NL80211_BAND_S1GHZ) {
922 local->scan_chandef.width = ieee80211_s1g_channel_width(chan);
923 goto set_channel;
924 }
925
926 /* If scanning on oper channel, use whatever channel-type
927 * is currently in use.
928 */
929 if (chan == local->_oper_chandef.chan)
930 local->scan_chandef = local->_oper_chandef;
931 else
932 local->scan_chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
933
934set_channel:
935 if (ieee80211_hw_config(local, changed: IEEE80211_CONF_CHANGE_CHANNEL))
936 skip = 1;
937
938 /* advance state machine to next channel/band */
939 local->scan_channel_idx++;
940
941 if (skip) {
942 /* if we skip this channel return to the decision state */
943 local->next_scan_state = SCAN_DECISION;
944 return;
945 }
946
947 /*
948 * Probe delay is used to update the NAV, cf. 11.1.3.2.2
949 * (which unfortunately doesn't say _why_ step a) is done,
950 * but it waits for the probe delay or until a frame is
951 * received - and the received frame would update the NAV).
952 * For now, we do not support waiting until a frame is
953 * received.
954 *
955 * In any case, it is not necessary for a passive scan.
956 */
957 if ((chan->flags & (IEEE80211_CHAN_NO_IR | IEEE80211_CHAN_RADAR)) ||
958 !scan_req->n_ssids) {
959 *next_delay = IEEE80211_PASSIVE_CHANNEL_TIME;
960 local->next_scan_state = SCAN_DECISION;
961 if (scan_req->n_ssids)
962 set_bit(nr: SCAN_BEACON_WAIT, addr: &local->scanning);
963 return;
964 }
965
966 /* active scan, send probes */
967 *next_delay = IEEE80211_PROBE_DELAY;
968 local->next_scan_state = SCAN_SEND_PROBE;
969}
970
971static void ieee80211_scan_state_suspend(struct ieee80211_local *local,
972 unsigned long *next_delay)
973{
974 /* switch back to the operating channel */
975 local->scan_chandef.chan = NULL;
976 ieee80211_hw_config(local, changed: IEEE80211_CONF_CHANGE_CHANNEL);
977
978 /* disable PS */
979 ieee80211_offchannel_return(local);
980
981 *next_delay = HZ / 5;
982 /* afterwards, resume scan & go to next channel */
983 local->next_scan_state = SCAN_RESUME;
984}
985
986static void ieee80211_scan_state_resume(struct ieee80211_local *local,
987 unsigned long *next_delay)
988{
989 ieee80211_offchannel_stop_vifs(local);
990
991 if (local->ops->flush) {
992 ieee80211_flush_queues(local, NULL, drop: false);
993 *next_delay = 0;
994 } else
995 *next_delay = HZ / 10;
996
997 /* remember when we left the operating channel */
998 local->leave_oper_channel_time = jiffies;
999
1000 /* advance to the next channel to be scanned */
1001 local->next_scan_state = SCAN_SET_CHANNEL;
1002}
1003
1004void ieee80211_scan_work(struct wiphy *wiphy, struct wiphy_work *work)
1005{
1006 struct ieee80211_local *local =
1007 container_of(work, struct ieee80211_local, scan_work.work);
1008 struct ieee80211_sub_if_data *sdata;
1009 struct cfg80211_scan_request *scan_req;
1010 unsigned long next_delay = 0;
1011 bool aborted;
1012
1013 lockdep_assert_wiphy(local->hw.wiphy);
1014
1015 if (!ieee80211_can_run_worker(local)) {
1016 aborted = true;
1017 goto out_complete;
1018 }
1019
1020 sdata = rcu_dereference_protected(local->scan_sdata,
1021 lockdep_is_held(&local->hw.wiphy->mtx));
1022 scan_req = rcu_dereference_protected(local->scan_req,
1023 lockdep_is_held(&local->hw.wiphy->mtx));
1024
1025 /* When scanning on-channel, the first-callback means completed. */
1026 if (test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning)) {
1027 aborted = test_and_clear_bit(nr: SCAN_ABORTED, addr: &local->scanning);
1028 goto out_complete;
1029 }
1030
1031 if (test_and_clear_bit(nr: SCAN_COMPLETED, addr: &local->scanning)) {
1032 aborted = test_and_clear_bit(nr: SCAN_ABORTED, addr: &local->scanning);
1033 goto out_complete;
1034 }
1035
1036 if (!sdata || !scan_req)
1037 return;
1038
1039 if (!local->scanning) {
1040 int rc;
1041
1042 RCU_INIT_POINTER(local->scan_req, NULL);
1043 RCU_INIT_POINTER(local->scan_sdata, NULL);
1044
1045 rc = __ieee80211_start_scan(sdata, req: scan_req);
1046 if (!rc)
1047 return;
1048 /* need to complete scan in cfg80211 */
1049 rcu_assign_pointer(local->scan_req, scan_req);
1050 aborted = true;
1051 goto out_complete;
1052 }
1053
1054 clear_bit(nr: SCAN_BEACON_WAIT, addr: &local->scanning);
1055
1056 /*
1057 * as long as no delay is required advance immediately
1058 * without scheduling a new work
1059 */
1060 do {
1061 if (!ieee80211_sdata_running(sdata)) {
1062 aborted = true;
1063 goto out_complete;
1064 }
1065
1066 if (test_and_clear_bit(nr: SCAN_BEACON_DONE, addr: &local->scanning) &&
1067 local->next_scan_state == SCAN_DECISION)
1068 local->next_scan_state = SCAN_SEND_PROBE;
1069
1070 switch (local->next_scan_state) {
1071 case SCAN_DECISION:
1072 /* if no more bands/channels left, complete scan */
1073 if (local->scan_channel_idx >= scan_req->n_channels) {
1074 aborted = false;
1075 goto out_complete;
1076 }
1077 ieee80211_scan_state_decision(local, next_delay: &next_delay);
1078 break;
1079 case SCAN_SET_CHANNEL:
1080 ieee80211_scan_state_set_channel(local, next_delay: &next_delay);
1081 break;
1082 case SCAN_SEND_PROBE:
1083 ieee80211_scan_state_send_probe(local, next_delay: &next_delay);
1084 break;
1085 case SCAN_SUSPEND:
1086 ieee80211_scan_state_suspend(local, next_delay: &next_delay);
1087 break;
1088 case SCAN_RESUME:
1089 ieee80211_scan_state_resume(local, next_delay: &next_delay);
1090 break;
1091 case SCAN_ABORT:
1092 aborted = true;
1093 goto out_complete;
1094 }
1095 } while (next_delay == 0);
1096
1097 wiphy_delayed_work_queue(wiphy: local->hw.wiphy, dwork: &local->scan_work,
1098 delay: next_delay);
1099 return;
1100
1101out_complete:
1102 __ieee80211_scan_completed(hw: &local->hw, aborted);
1103}
1104
1105int ieee80211_request_scan(struct ieee80211_sub_if_data *sdata,
1106 struct cfg80211_scan_request *req)
1107{
1108 lockdep_assert_wiphy(sdata->local->hw.wiphy);
1109
1110 return __ieee80211_start_scan(sdata, req);
1111}
1112
1113int ieee80211_request_ibss_scan(struct ieee80211_sub_if_data *sdata,
1114 const u8 *ssid, u8 ssid_len,
1115 struct ieee80211_channel **channels,
1116 unsigned int n_channels)
1117{
1118 struct ieee80211_local *local = sdata->local;
1119 int ret = -EBUSY, i, n_ch = 0;
1120 enum nl80211_band band;
1121
1122 lockdep_assert_wiphy(local->hw.wiphy);
1123
1124 /* busy scanning */
1125 if (local->scan_req)
1126 goto unlock;
1127
1128 /* fill internal scan request */
1129 if (!channels) {
1130 int max_n;
1131
1132 for (band = 0; band < NUM_NL80211_BANDS; band++) {
1133 if (!local->hw.wiphy->bands[band] ||
1134 band == NL80211_BAND_6GHZ)
1135 continue;
1136
1137 max_n = local->hw.wiphy->bands[band]->n_channels;
1138 for (i = 0; i < max_n; i++) {
1139 struct ieee80211_channel *tmp_ch =
1140 &local->hw.wiphy->bands[band]->channels[i];
1141
1142 if (tmp_ch->flags & (IEEE80211_CHAN_NO_IR |
1143 IEEE80211_CHAN_DISABLED))
1144 continue;
1145
1146 local->int_scan_req->channels[n_ch] = tmp_ch;
1147 n_ch++;
1148 }
1149 }
1150
1151 if (WARN_ON_ONCE(n_ch == 0))
1152 goto unlock;
1153
1154 local->int_scan_req->n_channels = n_ch;
1155 } else {
1156 for (i = 0; i < n_channels; i++) {
1157 if (channels[i]->flags & (IEEE80211_CHAN_NO_IR |
1158 IEEE80211_CHAN_DISABLED))
1159 continue;
1160
1161 local->int_scan_req->channels[n_ch] = channels[i];
1162 n_ch++;
1163 }
1164
1165 if (WARN_ON_ONCE(n_ch == 0))
1166 goto unlock;
1167
1168 local->int_scan_req->n_channels = n_ch;
1169 }
1170
1171 local->int_scan_req->ssids = &local->scan_ssid;
1172 local->int_scan_req->n_ssids = 1;
1173 memcpy(local->int_scan_req->ssids[0].ssid, ssid, IEEE80211_MAX_SSID_LEN);
1174 local->int_scan_req->ssids[0].ssid_len = ssid_len;
1175
1176 ret = __ieee80211_start_scan(sdata, req: sdata->local->int_scan_req);
1177 unlock:
1178 return ret;
1179}
1180
1181void ieee80211_scan_cancel(struct ieee80211_local *local)
1182{
1183 /* ensure a new scan cannot be queued */
1184 lockdep_assert_wiphy(local->hw.wiphy);
1185
1186 /*
1187 * We are canceling software scan, or deferred scan that was not
1188 * yet really started (see __ieee80211_start_scan ).
1189 *
1190 * Regarding hardware scan:
1191 * - we can not call __ieee80211_scan_completed() as when
1192 * SCAN_HW_SCANNING bit is set this function change
1193 * local->hw_scan_req to operate on 5G band, what race with
1194 * driver which can use local->hw_scan_req
1195 *
1196 * - we can not cancel scan_work since driver can schedule it
1197 * by ieee80211_scan_completed(..., true) to finish scan
1198 *
1199 * Hence we only call the cancel_hw_scan() callback, but the low-level
1200 * driver is still responsible for calling ieee80211_scan_completed()
1201 * after the scan was completed/aborted.
1202 */
1203
1204 if (!local->scan_req)
1205 return;
1206
1207 /*
1208 * We have a scan running and the driver already reported completion,
1209 * but the worker hasn't run yet or is stuck on the mutex - mark it as
1210 * cancelled.
1211 */
1212 if (test_bit(SCAN_HW_SCANNING, &local->scanning) &&
1213 test_bit(SCAN_COMPLETED, &local->scanning)) {
1214 set_bit(nr: SCAN_HW_CANCELLED, addr: &local->scanning);
1215 return;
1216 }
1217
1218 if (test_bit(SCAN_HW_SCANNING, &local->scanning)) {
1219 /*
1220 * Make sure that __ieee80211_scan_completed doesn't trigger a
1221 * scan on another band.
1222 */
1223 set_bit(nr: SCAN_HW_CANCELLED, addr: &local->scanning);
1224 if (local->ops->cancel_hw_scan)
1225 drv_cancel_hw_scan(local,
1226 rcu_dereference_protected(local->scan_sdata,
1227 lockdep_is_held(&local->hw.wiphy->mtx)));
1228 return;
1229 }
1230
1231 wiphy_delayed_work_cancel(wiphy: local->hw.wiphy, dwork: &local->scan_work);
1232 /* and clean up */
1233 memset(&local->scan_info, 0, sizeof(local->scan_info));
1234 __ieee80211_scan_completed(hw: &local->hw, aborted: true);
1235}
1236
1237int __ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata,
1238 struct cfg80211_sched_scan_request *req)
1239{
1240 struct ieee80211_local *local = sdata->local;
1241 struct ieee80211_scan_ies sched_scan_ies = {};
1242 struct cfg80211_chan_def chandef;
1243 int ret, i, iebufsz, num_bands = 0;
1244 u32 rate_masks[NUM_NL80211_BANDS] = {};
1245 u8 bands_used = 0;
1246 u8 *ie;
1247 u32 flags = 0;
1248
1249 lockdep_assert_wiphy(local->hw.wiphy);
1250
1251 iebufsz = local->scan_ies_len + req->ie_len;
1252
1253 if (!local->ops->sched_scan_start)
1254 return -ENOTSUPP;
1255
1256 for (i = 0; i < NUM_NL80211_BANDS; i++) {
1257 if (local->hw.wiphy->bands[i]) {
1258 bands_used |= BIT(i);
1259 rate_masks[i] = (u32) -1;
1260 num_bands++;
1261 }
1262 }
1263
1264 if (req->flags & NL80211_SCAN_FLAG_MIN_PREQ_CONTENT)
1265 flags |= IEEE80211_PROBE_FLAG_MIN_CONTENT;
1266
1267 ie = kcalloc(n: iebufsz, size: num_bands, GFP_KERNEL);
1268 if (!ie) {
1269 ret = -ENOMEM;
1270 goto out;
1271 }
1272
1273 ieee80211_prepare_scan_chandef(chandef: &chandef);
1274
1275 ieee80211_build_preq_ies(sdata, buffer: ie, buffer_len: num_bands * iebufsz,
1276 ie_desc: &sched_scan_ies, ie: req->ie,
1277 ie_len: req->ie_len, bands_used, rate_masks, chandef: &chandef,
1278 flags);
1279
1280 ret = drv_sched_scan_start(local, sdata, req, ies: &sched_scan_ies);
1281 if (ret == 0) {
1282 rcu_assign_pointer(local->sched_scan_sdata, sdata);
1283 rcu_assign_pointer(local->sched_scan_req, req);
1284 }
1285
1286 kfree(objp: ie);
1287
1288out:
1289 if (ret) {
1290 /* Clean in case of failure after HW restart or upon resume. */
1291 RCU_INIT_POINTER(local->sched_scan_sdata, NULL);
1292 RCU_INIT_POINTER(local->sched_scan_req, NULL);
1293 }
1294
1295 return ret;
1296}
1297
1298int ieee80211_request_sched_scan_start(struct ieee80211_sub_if_data *sdata,
1299 struct cfg80211_sched_scan_request *req)
1300{
1301 struct ieee80211_local *local = sdata->local;
1302
1303 lockdep_assert_wiphy(local->hw.wiphy);
1304
1305 if (rcu_access_pointer(local->sched_scan_sdata))
1306 return -EBUSY;
1307
1308 return __ieee80211_request_sched_scan_start(sdata, req);
1309}
1310
1311int ieee80211_request_sched_scan_stop(struct ieee80211_local *local)
1312{
1313 struct ieee80211_sub_if_data *sched_scan_sdata;
1314 int ret = -ENOENT;
1315
1316 lockdep_assert_wiphy(local->hw.wiphy);
1317
1318 if (!local->ops->sched_scan_stop)
1319 return -ENOTSUPP;
1320
1321 /* We don't want to restart sched scan anymore. */
1322 RCU_INIT_POINTER(local->sched_scan_req, NULL);
1323
1324 sched_scan_sdata = rcu_dereference_protected(local->sched_scan_sdata,
1325 lockdep_is_held(&local->hw.wiphy->mtx));
1326 if (sched_scan_sdata) {
1327 ret = drv_sched_scan_stop(local, sdata: sched_scan_sdata);
1328 if (!ret)
1329 RCU_INIT_POINTER(local->sched_scan_sdata, NULL);
1330 }
1331
1332 return ret;
1333}
1334
1335void ieee80211_sched_scan_results(struct ieee80211_hw *hw)
1336{
1337 struct ieee80211_local *local = hw_to_local(hw);
1338
1339 trace_api_sched_scan_results(local);
1340
1341 cfg80211_sched_scan_results(wiphy: hw->wiphy, reqid: 0);
1342}
1343EXPORT_SYMBOL(ieee80211_sched_scan_results);
1344
1345void ieee80211_sched_scan_end(struct ieee80211_local *local)
1346{
1347 lockdep_assert_wiphy(local->hw.wiphy);
1348
1349 if (!rcu_access_pointer(local->sched_scan_sdata))
1350 return;
1351
1352 RCU_INIT_POINTER(local->sched_scan_sdata, NULL);
1353
1354 /* If sched scan was aborted by the driver. */
1355 RCU_INIT_POINTER(local->sched_scan_req, NULL);
1356
1357 cfg80211_sched_scan_stopped_locked(wiphy: local->hw.wiphy, reqid: 0);
1358}
1359
1360void ieee80211_sched_scan_stopped_work(struct wiphy *wiphy,
1361 struct wiphy_work *work)
1362{
1363 struct ieee80211_local *local =
1364 container_of(work, struct ieee80211_local,
1365 sched_scan_stopped_work);
1366
1367 ieee80211_sched_scan_end(local);
1368}
1369
1370void ieee80211_sched_scan_stopped(struct ieee80211_hw *hw)
1371{
1372 struct ieee80211_local *local = hw_to_local(hw);
1373
1374 trace_api_sched_scan_stopped(local);
1375
1376 /*
1377 * this shouldn't really happen, so for simplicity
1378 * simply ignore it, and let mac80211 reconfigure
1379 * the sched scan later on.
1380 */
1381 if (local->in_reconfig)
1382 return;
1383
1384 wiphy_work_queue(wiphy: hw->wiphy, work: &local->sched_scan_stopped_work);
1385}
1386EXPORT_SYMBOL(ieee80211_sched_scan_stopped);
1387

source code of linux/net/mac80211/scan.c