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TOMOYO Linux Cross Reference
Linux/net/mac80211/util.c

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  1 /*
  2  * Copyright 2002-2005, Instant802 Networks, Inc.
  3  * Copyright 2005-2006, Devicescape Software, Inc.
  4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
  5  * Copyright 2007       Johannes Berg <johannes@sipsolutions.net>
  6  * Copyright 2013-2014  Intel Mobile Communications GmbH
  7  * Copyright (C) 2015-2017      Intel Deutschland GmbH
  8  *
  9  * This program is free software; you can redistribute it and/or modify
 10  * it under the terms of the GNU General Public License version 2 as
 11  * published by the Free Software Foundation.
 12  *
 13  * utilities for mac80211
 14  */
 15 
 16 #include <net/mac80211.h>
 17 #include <linux/netdevice.h>
 18 #include <linux/export.h>
 19 #include <linux/types.h>
 20 #include <linux/slab.h>
 21 #include <linux/skbuff.h>
 22 #include <linux/etherdevice.h>
 23 #include <linux/if_arp.h>
 24 #include <linux/bitmap.h>
 25 #include <linux/crc32.h>
 26 #include <net/net_namespace.h>
 27 #include <net/cfg80211.h>
 28 #include <net/rtnetlink.h>
 29 
 30 #include "ieee80211_i.h"
 31 #include "driver-ops.h"
 32 #include "rate.h"
 33 #include "mesh.h"
 34 #include "wme.h"
 35 #include "led.h"
 36 #include "wep.h"
 37 
 38 /* privid for wiphys to determine whether they belong to us or not */
 39 const void *const mac80211_wiphy_privid = &mac80211_wiphy_privid;
 40 
 41 struct ieee80211_hw *wiphy_to_ieee80211_hw(struct wiphy *wiphy)
 42 {
 43         struct ieee80211_local *local;
 44         BUG_ON(!wiphy);
 45 
 46         local = wiphy_priv(wiphy);
 47         return &local->hw;
 48 }
 49 EXPORT_SYMBOL(wiphy_to_ieee80211_hw);
 50 
 51 void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
 52 {
 53         struct sk_buff *skb;
 54         struct ieee80211_hdr *hdr;
 55 
 56         skb_queue_walk(&tx->skbs, skb) {
 57                 hdr = (struct ieee80211_hdr *) skb->data;
 58                 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
 59         }
 60 }
 61 
 62 int ieee80211_frame_duration(enum nl80211_band band, size_t len,
 63                              int rate, int erp, int short_preamble,
 64                              int shift)
 65 {
 66         int dur;
 67 
 68         /* calculate duration (in microseconds, rounded up to next higher
 69          * integer if it includes a fractional microsecond) to send frame of
 70          * len bytes (does not include FCS) at the given rate. Duration will
 71          * also include SIFS.
 72          *
 73          * rate is in 100 kbps, so divident is multiplied by 10 in the
 74          * DIV_ROUND_UP() operations.
 75          *
 76          * shift may be 2 for 5 MHz channels or 1 for 10 MHz channels, and
 77          * is assumed to be 0 otherwise.
 78          */
 79 
 80         if (band == NL80211_BAND_5GHZ || erp) {
 81                 /*
 82                  * OFDM:
 83                  *
 84                  * N_DBPS = DATARATE x 4
 85                  * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
 86                  *      (16 = SIGNAL time, 6 = tail bits)
 87                  * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
 88                  *
 89                  * T_SYM = 4 usec
 90                  * 802.11a - 18.5.2: aSIFSTime = 16 usec
 91                  * 802.11g - 19.8.4: aSIFSTime = 10 usec +
 92                  *      signal ext = 6 usec
 93                  */
 94                 dur = 16; /* SIFS + signal ext */
 95                 dur += 16; /* IEEE 802.11-2012 18.3.2.4: T_PREAMBLE = 16 usec */
 96                 dur += 4; /* IEEE 802.11-2012 18.3.2.4: T_SIGNAL = 4 usec */
 97 
 98                 /* IEEE 802.11-2012 18.3.2.4: all values above are:
 99                  *  * times 4 for 5 MHz
100                  *  * times 2 for 10 MHz
101                  */
102                 dur *= 1 << shift;
103 
104                 /* rates should already consider the channel bandwidth,
105                  * don't apply divisor again.
106                  */
107                 dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
108                                         4 * rate); /* T_SYM x N_SYM */
109         } else {
110                 /*
111                  * 802.11b or 802.11g with 802.11b compatibility:
112                  * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
113                  * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
114                  *
115                  * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
116                  * aSIFSTime = 10 usec
117                  * aPreambleLength = 144 usec or 72 usec with short preamble
118                  * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
119                  */
120                 dur = 10; /* aSIFSTime = 10 usec */
121                 dur += short_preamble ? (72 + 24) : (144 + 48);
122 
123                 dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
124         }
125 
126         return dur;
127 }
128 
129 /* Exported duration function for driver use */
130 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
131                                         struct ieee80211_vif *vif,
132                                         enum nl80211_band band,
133                                         size_t frame_len,
134                                         struct ieee80211_rate *rate)
135 {
136         struct ieee80211_sub_if_data *sdata;
137         u16 dur;
138         int erp, shift = 0;
139         bool short_preamble = false;
140 
141         erp = 0;
142         if (vif) {
143                 sdata = vif_to_sdata(vif);
144                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
145                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
146                         erp = rate->flags & IEEE80211_RATE_ERP_G;
147                 shift = ieee80211_vif_get_shift(vif);
148         }
149 
150         dur = ieee80211_frame_duration(band, frame_len, rate->bitrate, erp,
151                                        short_preamble, shift);
152 
153         return cpu_to_le16(dur);
154 }
155 EXPORT_SYMBOL(ieee80211_generic_frame_duration);
156 
157 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
158                               struct ieee80211_vif *vif, size_t frame_len,
159                               const struct ieee80211_tx_info *frame_txctl)
160 {
161         struct ieee80211_local *local = hw_to_local(hw);
162         struct ieee80211_rate *rate;
163         struct ieee80211_sub_if_data *sdata;
164         bool short_preamble;
165         int erp, shift = 0, bitrate;
166         u16 dur;
167         struct ieee80211_supported_band *sband;
168 
169         sband = local->hw.wiphy->bands[frame_txctl->band];
170 
171         short_preamble = false;
172 
173         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
174 
175         erp = 0;
176         if (vif) {
177                 sdata = vif_to_sdata(vif);
178                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
179                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
180                         erp = rate->flags & IEEE80211_RATE_ERP_G;
181                 shift = ieee80211_vif_get_shift(vif);
182         }
183 
184         bitrate = DIV_ROUND_UP(rate->bitrate, 1 << shift);
185 
186         /* CTS duration */
187         dur = ieee80211_frame_duration(sband->band, 10, bitrate,
188                                        erp, short_preamble, shift);
189         /* Data frame duration */
190         dur += ieee80211_frame_duration(sband->band, frame_len, bitrate,
191                                         erp, short_preamble, shift);
192         /* ACK duration */
193         dur += ieee80211_frame_duration(sband->band, 10, bitrate,
194                                         erp, short_preamble, shift);
195 
196         return cpu_to_le16(dur);
197 }
198 EXPORT_SYMBOL(ieee80211_rts_duration);
199 
200 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
201                                     struct ieee80211_vif *vif,
202                                     size_t frame_len,
203                                     const struct ieee80211_tx_info *frame_txctl)
204 {
205         struct ieee80211_local *local = hw_to_local(hw);
206         struct ieee80211_rate *rate;
207         struct ieee80211_sub_if_data *sdata;
208         bool short_preamble;
209         int erp, shift = 0, bitrate;
210         u16 dur;
211         struct ieee80211_supported_band *sband;
212 
213         sband = local->hw.wiphy->bands[frame_txctl->band];
214 
215         short_preamble = false;
216 
217         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
218         erp = 0;
219         if (vif) {
220                 sdata = vif_to_sdata(vif);
221                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
222                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
223                         erp = rate->flags & IEEE80211_RATE_ERP_G;
224                 shift = ieee80211_vif_get_shift(vif);
225         }
226 
227         bitrate = DIV_ROUND_UP(rate->bitrate, 1 << shift);
228 
229         /* Data frame duration */
230         dur = ieee80211_frame_duration(sband->band, frame_len, bitrate,
231                                        erp, short_preamble, shift);
232         if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
233                 /* ACK duration */
234                 dur += ieee80211_frame_duration(sband->band, 10, bitrate,
235                                                 erp, short_preamble, shift);
236         }
237 
238         return cpu_to_le16(dur);
239 }
240 EXPORT_SYMBOL(ieee80211_ctstoself_duration);
241 
242 void ieee80211_propagate_queue_wake(struct ieee80211_local *local, int queue)
243 {
244         struct ieee80211_sub_if_data *sdata;
245         int n_acs = IEEE80211_NUM_ACS;
246 
247         if (local->ops->wake_tx_queue)
248                 return;
249 
250         if (local->hw.queues < IEEE80211_NUM_ACS)
251                 n_acs = 1;
252 
253         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
254                 int ac;
255 
256                 if (!sdata->dev)
257                         continue;
258 
259                 if (sdata->vif.cab_queue != IEEE80211_INVAL_HW_QUEUE &&
260                     local->queue_stop_reasons[sdata->vif.cab_queue] != 0)
261                         continue;
262 
263                 for (ac = 0; ac < n_acs; ac++) {
264                         int ac_queue = sdata->vif.hw_queue[ac];
265 
266                         if (ac_queue == queue ||
267                             (sdata->vif.cab_queue == queue &&
268                              local->queue_stop_reasons[ac_queue] == 0 &&
269                              skb_queue_empty(&local->pending[ac_queue])))
270                                 netif_wake_subqueue(sdata->dev, ac);
271                 }
272         }
273 }
274 
275 static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
276                                    enum queue_stop_reason reason,
277                                    bool refcounted)
278 {
279         struct ieee80211_local *local = hw_to_local(hw);
280 
281         trace_wake_queue(local, queue, reason);
282 
283         if (WARN_ON(queue >= hw->queues))
284                 return;
285 
286         if (!test_bit(reason, &local->queue_stop_reasons[queue]))
287                 return;
288 
289         if (!refcounted) {
290                 local->q_stop_reasons[queue][reason] = 0;
291         } else {
292                 local->q_stop_reasons[queue][reason]--;
293                 if (WARN_ON(local->q_stop_reasons[queue][reason] < 0))
294                         local->q_stop_reasons[queue][reason] = 0;
295         }
296 
297         if (local->q_stop_reasons[queue][reason] == 0)
298                 __clear_bit(reason, &local->queue_stop_reasons[queue]);
299 
300         if (local->queue_stop_reasons[queue] != 0)
301                 /* someone still has this queue stopped */
302                 return;
303 
304         if (skb_queue_empty(&local->pending[queue])) {
305                 rcu_read_lock();
306                 ieee80211_propagate_queue_wake(local, queue);
307                 rcu_read_unlock();
308         } else
309                 tasklet_schedule(&local->tx_pending_tasklet);
310 }
311 
312 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
313                                     enum queue_stop_reason reason,
314                                     bool refcounted)
315 {
316         struct ieee80211_local *local = hw_to_local(hw);
317         unsigned long flags;
318 
319         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
320         __ieee80211_wake_queue(hw, queue, reason, refcounted);
321         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
322 }
323 
324 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
325 {
326         ieee80211_wake_queue_by_reason(hw, queue,
327                                        IEEE80211_QUEUE_STOP_REASON_DRIVER,
328                                        false);
329 }
330 EXPORT_SYMBOL(ieee80211_wake_queue);
331 
332 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
333                                    enum queue_stop_reason reason,
334                                    bool refcounted)
335 {
336         struct ieee80211_local *local = hw_to_local(hw);
337         struct ieee80211_sub_if_data *sdata;
338         int n_acs = IEEE80211_NUM_ACS;
339 
340         trace_stop_queue(local, queue, reason);
341 
342         if (WARN_ON(queue >= hw->queues))
343                 return;
344 
345         if (!refcounted)
346                 local->q_stop_reasons[queue][reason] = 1;
347         else
348                 local->q_stop_reasons[queue][reason]++;
349 
350         if (__test_and_set_bit(reason, &local->queue_stop_reasons[queue]))
351                 return;
352 
353         if (local->ops->wake_tx_queue)
354                 return;
355 
356         if (local->hw.queues < IEEE80211_NUM_ACS)
357                 n_acs = 1;
358 
359         rcu_read_lock();
360         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
361                 int ac;
362 
363                 if (!sdata->dev)
364                         continue;
365 
366                 for (ac = 0; ac < n_acs; ac++) {
367                         if (sdata->vif.hw_queue[ac] == queue ||
368                             sdata->vif.cab_queue == queue)
369                                 netif_stop_subqueue(sdata->dev, ac);
370                 }
371         }
372         rcu_read_unlock();
373 }
374 
375 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
376                                     enum queue_stop_reason reason,
377                                     bool refcounted)
378 {
379         struct ieee80211_local *local = hw_to_local(hw);
380         unsigned long flags;
381 
382         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
383         __ieee80211_stop_queue(hw, queue, reason, refcounted);
384         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
385 }
386 
387 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
388 {
389         ieee80211_stop_queue_by_reason(hw, queue,
390                                        IEEE80211_QUEUE_STOP_REASON_DRIVER,
391                                        false);
392 }
393 EXPORT_SYMBOL(ieee80211_stop_queue);
394 
395 void ieee80211_add_pending_skb(struct ieee80211_local *local,
396                                struct sk_buff *skb)
397 {
398         struct ieee80211_hw *hw = &local->hw;
399         unsigned long flags;
400         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
401         int queue = info->hw_queue;
402 
403         if (WARN_ON(!info->control.vif)) {
404                 ieee80211_free_txskb(&local->hw, skb);
405                 return;
406         }
407 
408         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
409         __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD,
410                                false);
411         __skb_queue_tail(&local->pending[queue], skb);
412         __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD,
413                                false);
414         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
415 }
416 
417 void ieee80211_add_pending_skbs(struct ieee80211_local *local,
418                                 struct sk_buff_head *skbs)
419 {
420         struct ieee80211_hw *hw = &local->hw;
421         struct sk_buff *skb;
422         unsigned long flags;
423         int queue, i;
424 
425         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
426         while ((skb = skb_dequeue(skbs))) {
427                 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
428 
429                 if (WARN_ON(!info->control.vif)) {
430                         ieee80211_free_txskb(&local->hw, skb);
431                         continue;
432                 }
433 
434                 queue = info->hw_queue;
435 
436                 __ieee80211_stop_queue(hw, queue,
437                                 IEEE80211_QUEUE_STOP_REASON_SKB_ADD,
438                                 false);
439 
440                 __skb_queue_tail(&local->pending[queue], skb);
441         }
442 
443         for (i = 0; i < hw->queues; i++)
444                 __ieee80211_wake_queue(hw, i,
445                         IEEE80211_QUEUE_STOP_REASON_SKB_ADD,
446                         false);
447         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
448 }
449 
450 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
451                                      unsigned long queues,
452                                      enum queue_stop_reason reason,
453                                      bool refcounted)
454 {
455         struct ieee80211_local *local = hw_to_local(hw);
456         unsigned long flags;
457         int i;
458 
459         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
460 
461         for_each_set_bit(i, &queues, hw->queues)
462                 __ieee80211_stop_queue(hw, i, reason, refcounted);
463 
464         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
465 }
466 
467 void ieee80211_stop_queues(struct ieee80211_hw *hw)
468 {
469         ieee80211_stop_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
470                                         IEEE80211_QUEUE_STOP_REASON_DRIVER,
471                                         false);
472 }
473 EXPORT_SYMBOL(ieee80211_stop_queues);
474 
475 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
476 {
477         struct ieee80211_local *local = hw_to_local(hw);
478         unsigned long flags;
479         int ret;
480 
481         if (WARN_ON(queue >= hw->queues))
482                 return true;
483 
484         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
485         ret = test_bit(IEEE80211_QUEUE_STOP_REASON_DRIVER,
486                        &local->queue_stop_reasons[queue]);
487         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
488         return ret;
489 }
490 EXPORT_SYMBOL(ieee80211_queue_stopped);
491 
492 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
493                                      unsigned long queues,
494                                      enum queue_stop_reason reason,
495                                      bool refcounted)
496 {
497         struct ieee80211_local *local = hw_to_local(hw);
498         unsigned long flags;
499         int i;
500 
501         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
502 
503         for_each_set_bit(i, &queues, hw->queues)
504                 __ieee80211_wake_queue(hw, i, reason, refcounted);
505 
506         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
507 }
508 
509 void ieee80211_wake_queues(struct ieee80211_hw *hw)
510 {
511         ieee80211_wake_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
512                                         IEEE80211_QUEUE_STOP_REASON_DRIVER,
513                                         false);
514 }
515 EXPORT_SYMBOL(ieee80211_wake_queues);
516 
517 static unsigned int
518 ieee80211_get_vif_queues(struct ieee80211_local *local,
519                          struct ieee80211_sub_if_data *sdata)
520 {
521         unsigned int queues;
522 
523         if (sdata && ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
524                 int ac;
525 
526                 queues = 0;
527 
528                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
529                         queues |= BIT(sdata->vif.hw_queue[ac]);
530                 if (sdata->vif.cab_queue != IEEE80211_INVAL_HW_QUEUE)
531                         queues |= BIT(sdata->vif.cab_queue);
532         } else {
533                 /* all queues */
534                 queues = BIT(local->hw.queues) - 1;
535         }
536 
537         return queues;
538 }
539 
540 void __ieee80211_flush_queues(struct ieee80211_local *local,
541                               struct ieee80211_sub_if_data *sdata,
542                               unsigned int queues, bool drop)
543 {
544         if (!local->ops->flush)
545                 return;
546 
547         /*
548          * If no queue was set, or if the HW doesn't support
549          * IEEE80211_HW_QUEUE_CONTROL - flush all queues
550          */
551         if (!queues || !ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
552                 queues = ieee80211_get_vif_queues(local, sdata);
553 
554         ieee80211_stop_queues_by_reason(&local->hw, queues,
555                                         IEEE80211_QUEUE_STOP_REASON_FLUSH,
556                                         false);
557 
558         drv_flush(local, sdata, queues, drop);
559 
560         ieee80211_wake_queues_by_reason(&local->hw, queues,
561                                         IEEE80211_QUEUE_STOP_REASON_FLUSH,
562                                         false);
563 }
564 
565 void ieee80211_flush_queues(struct ieee80211_local *local,
566                             struct ieee80211_sub_if_data *sdata, bool drop)
567 {
568         __ieee80211_flush_queues(local, sdata, 0, drop);
569 }
570 
571 void ieee80211_stop_vif_queues(struct ieee80211_local *local,
572                                struct ieee80211_sub_if_data *sdata,
573                                enum queue_stop_reason reason)
574 {
575         ieee80211_stop_queues_by_reason(&local->hw,
576                                         ieee80211_get_vif_queues(local, sdata),
577                                         reason, true);
578 }
579 
580 void ieee80211_wake_vif_queues(struct ieee80211_local *local,
581                                struct ieee80211_sub_if_data *sdata,
582                                enum queue_stop_reason reason)
583 {
584         ieee80211_wake_queues_by_reason(&local->hw,
585                                         ieee80211_get_vif_queues(local, sdata),
586                                         reason, true);
587 }
588 
589 static void __iterate_interfaces(struct ieee80211_local *local,
590                                  u32 iter_flags,
591                                  void (*iterator)(void *data, u8 *mac,
592                                                   struct ieee80211_vif *vif),
593                                  void *data)
594 {
595         struct ieee80211_sub_if_data *sdata;
596         bool active_only = iter_flags & IEEE80211_IFACE_ITER_ACTIVE;
597 
598         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
599                 switch (sdata->vif.type) {
600                 case NL80211_IFTYPE_MONITOR:
601                         if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
602                                 continue;
603                         break;
604                 case NL80211_IFTYPE_AP_VLAN:
605                         continue;
606                 default:
607                         break;
608                 }
609                 if (!(iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL) &&
610                     active_only && !(sdata->flags & IEEE80211_SDATA_IN_DRIVER))
611                         continue;
612                 if (ieee80211_sdata_running(sdata) || !active_only)
613                         iterator(data, sdata->vif.addr,
614                                  &sdata->vif);
615         }
616 
617         sdata = rcu_dereference_check(local->monitor_sdata,
618                                       lockdep_is_held(&local->iflist_mtx) ||
619                                       lockdep_rtnl_is_held());
620         if (sdata &&
621             (iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL || !active_only ||
622              sdata->flags & IEEE80211_SDATA_IN_DRIVER))
623                 iterator(data, sdata->vif.addr, &sdata->vif);
624 }
625 
626 void ieee80211_iterate_interfaces(
627         struct ieee80211_hw *hw, u32 iter_flags,
628         void (*iterator)(void *data, u8 *mac,
629                          struct ieee80211_vif *vif),
630         void *data)
631 {
632         struct ieee80211_local *local = hw_to_local(hw);
633 
634         mutex_lock(&local->iflist_mtx);
635         __iterate_interfaces(local, iter_flags, iterator, data);
636         mutex_unlock(&local->iflist_mtx);
637 }
638 EXPORT_SYMBOL_GPL(ieee80211_iterate_interfaces);
639 
640 void ieee80211_iterate_active_interfaces_atomic(
641         struct ieee80211_hw *hw, u32 iter_flags,
642         void (*iterator)(void *data, u8 *mac,
643                          struct ieee80211_vif *vif),
644         void *data)
645 {
646         struct ieee80211_local *local = hw_to_local(hw);
647 
648         rcu_read_lock();
649         __iterate_interfaces(local, iter_flags | IEEE80211_IFACE_ITER_ACTIVE,
650                              iterator, data);
651         rcu_read_unlock();
652 }
653 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
654 
655 void ieee80211_iterate_active_interfaces_rtnl(
656         struct ieee80211_hw *hw, u32 iter_flags,
657         void (*iterator)(void *data, u8 *mac,
658                          struct ieee80211_vif *vif),
659         void *data)
660 {
661         struct ieee80211_local *local = hw_to_local(hw);
662 
663         ASSERT_RTNL();
664 
665         __iterate_interfaces(local, iter_flags | IEEE80211_IFACE_ITER_ACTIVE,
666                              iterator, data);
667 }
668 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_rtnl);
669 
670 static void __iterate_stations(struct ieee80211_local *local,
671                                void (*iterator)(void *data,
672                                                 struct ieee80211_sta *sta),
673                                void *data)
674 {
675         struct sta_info *sta;
676 
677         list_for_each_entry_rcu(sta, &local->sta_list, list) {
678                 if (!sta->uploaded)
679                         continue;
680 
681                 iterator(data, &sta->sta);
682         }
683 }
684 
685 void ieee80211_iterate_stations_atomic(struct ieee80211_hw *hw,
686                         void (*iterator)(void *data,
687                                          struct ieee80211_sta *sta),
688                         void *data)
689 {
690         struct ieee80211_local *local = hw_to_local(hw);
691 
692         rcu_read_lock();
693         __iterate_stations(local, iterator, data);
694         rcu_read_unlock();
695 }
696 EXPORT_SYMBOL_GPL(ieee80211_iterate_stations_atomic);
697 
698 struct ieee80211_vif *wdev_to_ieee80211_vif(struct wireless_dev *wdev)
699 {
700         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
701 
702         if (!ieee80211_sdata_running(sdata) ||
703             !(sdata->flags & IEEE80211_SDATA_IN_DRIVER))
704                 return NULL;
705         return &sdata->vif;
706 }
707 EXPORT_SYMBOL_GPL(wdev_to_ieee80211_vif);
708 
709 struct wireless_dev *ieee80211_vif_to_wdev(struct ieee80211_vif *vif)
710 {
711         struct ieee80211_sub_if_data *sdata;
712 
713         if (!vif)
714                 return NULL;
715 
716         sdata = vif_to_sdata(vif);
717 
718         if (!ieee80211_sdata_running(sdata) ||
719             !(sdata->flags & IEEE80211_SDATA_IN_DRIVER))
720                 return NULL;
721 
722         return &sdata->wdev;
723 }
724 EXPORT_SYMBOL_GPL(ieee80211_vif_to_wdev);
725 
726 /*
727  * Nothing should have been stuffed into the workqueue during
728  * the suspend->resume cycle. Since we can't check each caller
729  * of this function if we are already quiescing / suspended,
730  * check here and don't WARN since this can actually happen when
731  * the rx path (for example) is racing against __ieee80211_suspend
732  * and suspending / quiescing was set after the rx path checked
733  * them.
734  */
735 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
736 {
737         if (local->quiescing || (local->suspended && !local->resuming)) {
738                 pr_warn("queueing ieee80211 work while going to suspend\n");
739                 return false;
740         }
741 
742         return true;
743 }
744 
745 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
746 {
747         struct ieee80211_local *local = hw_to_local(hw);
748 
749         if (!ieee80211_can_queue_work(local))
750                 return;
751 
752         queue_work(local->workqueue, work);
753 }
754 EXPORT_SYMBOL(ieee80211_queue_work);
755 
756 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
757                                   struct delayed_work *dwork,
758                                   unsigned long delay)
759 {
760         struct ieee80211_local *local = hw_to_local(hw);
761 
762         if (!ieee80211_can_queue_work(local))
763                 return;
764 
765         queue_delayed_work(local->workqueue, dwork, delay);
766 }
767 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
768 
769 u32 ieee802_11_parse_elems_crc(const u8 *start, size_t len, bool action,
770                                struct ieee802_11_elems *elems,
771                                u64 filter, u32 crc)
772 {
773         size_t left = len;
774         const u8 *pos = start;
775         bool calc_crc = filter != 0;
776         DECLARE_BITMAP(seen_elems, 256);
777         const u8 *ie;
778 
779         bitmap_zero(seen_elems, 256);
780         memset(elems, 0, sizeof(*elems));
781         elems->ie_start = start;
782         elems->total_len = len;
783 
784         while (left >= 2) {
785                 u8 id, elen;
786                 bool elem_parse_failed;
787 
788                 id = *pos++;
789                 elen = *pos++;
790                 left -= 2;
791 
792                 if (elen > left) {
793                         elems->parse_error = true;
794                         break;
795                 }
796 
797                 switch (id) {
798                 case WLAN_EID_SSID:
799                 case WLAN_EID_SUPP_RATES:
800                 case WLAN_EID_FH_PARAMS:
801                 case WLAN_EID_DS_PARAMS:
802                 case WLAN_EID_CF_PARAMS:
803                 case WLAN_EID_TIM:
804                 case WLAN_EID_IBSS_PARAMS:
805                 case WLAN_EID_CHALLENGE:
806                 case WLAN_EID_RSN:
807                 case WLAN_EID_ERP_INFO:
808                 case WLAN_EID_EXT_SUPP_RATES:
809                 case WLAN_EID_HT_CAPABILITY:
810                 case WLAN_EID_HT_OPERATION:
811                 case WLAN_EID_VHT_CAPABILITY:
812                 case WLAN_EID_VHT_OPERATION:
813                 case WLAN_EID_MESH_ID:
814                 case WLAN_EID_MESH_CONFIG:
815                 case WLAN_EID_PEER_MGMT:
816                 case WLAN_EID_PREQ:
817                 case WLAN_EID_PREP:
818                 case WLAN_EID_PERR:
819                 case WLAN_EID_RANN:
820                 case WLAN_EID_CHANNEL_SWITCH:
821                 case WLAN_EID_EXT_CHANSWITCH_ANN:
822                 case WLAN_EID_COUNTRY:
823                 case WLAN_EID_PWR_CONSTRAINT:
824                 case WLAN_EID_TIMEOUT_INTERVAL:
825                 case WLAN_EID_SECONDARY_CHANNEL_OFFSET:
826                 case WLAN_EID_WIDE_BW_CHANNEL_SWITCH:
827                 case WLAN_EID_CHAN_SWITCH_PARAM:
828                 case WLAN_EID_EXT_CAPABILITY:
829                 case WLAN_EID_CHAN_SWITCH_TIMING:
830                 case WLAN_EID_LINK_ID:
831                 case WLAN_EID_BSS_MAX_IDLE_PERIOD:
832                 /*
833                  * not listing WLAN_EID_CHANNEL_SWITCH_WRAPPER -- it seems possible
834                  * that if the content gets bigger it might be needed more than once
835                  */
836                         if (test_bit(id, seen_elems)) {
837                                 elems->parse_error = true;
838                                 left -= elen;
839                                 pos += elen;
840                                 continue;
841                         }
842                         break;
843                 }
844 
845                 if (calc_crc && id < 64 && (filter & (1ULL << id)))
846                         crc = crc32_be(crc, pos - 2, elen + 2);
847 
848                 elem_parse_failed = false;
849 
850                 switch (id) {
851                 case WLAN_EID_LINK_ID:
852                         if (elen + 2 != sizeof(struct ieee80211_tdls_lnkie)) {
853                                 elem_parse_failed = true;
854                                 break;
855                         }
856                         elems->lnk_id = (void *)(pos - 2);
857                         break;
858                 case WLAN_EID_CHAN_SWITCH_TIMING:
859                         if (elen != sizeof(struct ieee80211_ch_switch_timing)) {
860                                 elem_parse_failed = true;
861                                 break;
862                         }
863                         elems->ch_sw_timing = (void *)pos;
864                         break;
865                 case WLAN_EID_EXT_CAPABILITY:
866                         elems->ext_capab = pos;
867                         elems->ext_capab_len = elen;
868                         break;
869                 case WLAN_EID_SSID:
870                         elems->ssid = pos;
871                         elems->ssid_len = elen;
872                         break;
873                 case WLAN_EID_SUPP_RATES:
874                         elems->supp_rates = pos;
875                         elems->supp_rates_len = elen;
876                         break;
877                 case WLAN_EID_DS_PARAMS:
878                         if (elen >= 1)
879                                 elems->ds_params = pos;
880                         else
881                                 elem_parse_failed = true;
882                         break;
883                 case WLAN_EID_TIM:
884                         if (elen >= sizeof(struct ieee80211_tim_ie)) {
885                                 elems->tim = (void *)pos;
886                                 elems->tim_len = elen;
887                         } else
888                                 elem_parse_failed = true;
889                         break;
890                 case WLAN_EID_CHALLENGE:
891                         elems->challenge = pos;
892                         elems->challenge_len = elen;
893                         break;
894                 case WLAN_EID_VENDOR_SPECIFIC:
895                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
896                             pos[2] == 0xf2) {
897                                 /* Microsoft OUI (00:50:F2) */
898 
899                                 if (calc_crc)
900                                         crc = crc32_be(crc, pos - 2, elen + 2);
901 
902                                 if (elen >= 5 && pos[3] == 2) {
903                                         /* OUI Type 2 - WMM IE */
904                                         if (pos[4] == 0) {
905                                                 elems->wmm_info = pos;
906                                                 elems->wmm_info_len = elen;
907                                         } else if (pos[4] == 1) {
908                                                 elems->wmm_param = pos;
909                                                 elems->wmm_param_len = elen;
910                                         }
911                                 }
912                         }
913                         break;
914                 case WLAN_EID_RSN:
915                         elems->rsn = pos;
916                         elems->rsn_len = elen;
917                         break;
918                 case WLAN_EID_ERP_INFO:
919                         if (elen >= 1)
920                                 elems->erp_info = pos;
921                         else
922                                 elem_parse_failed = true;
923                         break;
924                 case WLAN_EID_EXT_SUPP_RATES:
925                         elems->ext_supp_rates = pos;
926                         elems->ext_supp_rates_len = elen;
927                         break;
928                 case WLAN_EID_HT_CAPABILITY:
929                         if (elen >= sizeof(struct ieee80211_ht_cap))
930                                 elems->ht_cap_elem = (void *)pos;
931                         else
932                                 elem_parse_failed = true;
933                         break;
934                 case WLAN_EID_HT_OPERATION:
935                         if (elen >= sizeof(struct ieee80211_ht_operation))
936                                 elems->ht_operation = (void *)pos;
937                         else
938                                 elem_parse_failed = true;
939                         break;
940                 case WLAN_EID_VHT_CAPABILITY:
941                         if (elen >= sizeof(struct ieee80211_vht_cap))
942                                 elems->vht_cap_elem = (void *)pos;
943                         else
944                                 elem_parse_failed = true;
945                         break;
946                 case WLAN_EID_VHT_OPERATION:
947                         if (elen >= sizeof(struct ieee80211_vht_operation))
948                                 elems->vht_operation = (void *)pos;
949                         else
950                                 elem_parse_failed = true;
951                         break;
952                 case WLAN_EID_OPMODE_NOTIF:
953                         if (elen > 0)
954                                 elems->opmode_notif = pos;
955                         else
956                                 elem_parse_failed = true;
957                         break;
958                 case WLAN_EID_MESH_ID:
959                         elems->mesh_id = pos;
960                         elems->mesh_id_len = elen;
961                         break;
962                 case WLAN_EID_MESH_CONFIG:
963                         if (elen >= sizeof(struct ieee80211_meshconf_ie))
964                                 elems->mesh_config = (void *)pos;
965                         else
966                                 elem_parse_failed = true;
967                         break;
968                 case WLAN_EID_PEER_MGMT:
969                         elems->peering = pos;
970                         elems->peering_len = elen;
971                         break;
972                 case WLAN_EID_MESH_AWAKE_WINDOW:
973                         if (elen >= 2)
974                                 elems->awake_window = (void *)pos;
975                         break;
976                 case WLAN_EID_PREQ:
977                         elems->preq = pos;
978                         elems->preq_len = elen;
979                         break;
980                 case WLAN_EID_PREP:
981                         elems->prep = pos;
982                         elems->prep_len = elen;
983                         break;
984                 case WLAN_EID_PERR:
985                         elems->perr = pos;
986                         elems->perr_len = elen;
987                         break;
988                 case WLAN_EID_RANN:
989                         if (elen >= sizeof(struct ieee80211_rann_ie))
990                                 elems->rann = (void *)pos;
991                         else
992                                 elem_parse_failed = true;
993                         break;
994                 case WLAN_EID_CHANNEL_SWITCH:
995                         if (elen != sizeof(struct ieee80211_channel_sw_ie)) {
996                                 elem_parse_failed = true;
997                                 break;
998                         }
999                         elems->ch_switch_ie = (void *)pos;
1000                         break;
1001                 case WLAN_EID_EXT_CHANSWITCH_ANN:
1002                         if (elen != sizeof(struct ieee80211_ext_chansw_ie)) {
1003                                 elem_parse_failed = true;
1004                                 break;
1005                         }
1006                         elems->ext_chansw_ie = (void *)pos;
1007                         break;
1008                 case WLAN_EID_SECONDARY_CHANNEL_OFFSET:
1009                         if (elen != sizeof(struct ieee80211_sec_chan_offs_ie)) {
1010                                 elem_parse_failed = true;
1011                                 break;
1012                         }
1013                         elems->sec_chan_offs = (void *)pos;
1014                         break;
1015                 case WLAN_EID_CHAN_SWITCH_PARAM:
1016                         if (elen !=
1017                             sizeof(*elems->mesh_chansw_params_ie)) {
1018                                 elem_parse_failed = true;
1019                                 break;
1020                         }
1021                         elems->mesh_chansw_params_ie = (void *)pos;
1022                         break;
1023                 case WLAN_EID_WIDE_BW_CHANNEL_SWITCH:
1024                         if (!action ||
1025                             elen != sizeof(*elems->wide_bw_chansw_ie)) {
1026                                 elem_parse_failed = true;
1027                                 break;
1028                         }
1029                         elems->wide_bw_chansw_ie = (void *)pos;
1030                         break;
1031                 case WLAN_EID_CHANNEL_SWITCH_WRAPPER:
1032                         if (action) {
1033                                 elem_parse_failed = true;
1034                                 break;
1035                         }
1036                         /*
1037                          * This is a bit tricky, but as we only care about
1038                          * the wide bandwidth channel switch element, so
1039                          * just parse it out manually.
1040                          */
1041                         ie = cfg80211_find_ie(WLAN_EID_WIDE_BW_CHANNEL_SWITCH,
1042                                               pos, elen);
1043                         if (ie) {
1044                                 if (ie[1] == sizeof(*elems->wide_bw_chansw_ie))
1045                                         elems->wide_bw_chansw_ie =
1046                                                 (void *)(ie + 2);
1047                                 else
1048                                         elem_parse_failed = true;
1049                         }
1050                         break;
1051                 case WLAN_EID_COUNTRY:
1052                         elems->country_elem = pos;
1053                         elems->country_elem_len = elen;
1054                         break;
1055                 case WLAN_EID_PWR_CONSTRAINT:
1056                         if (elen != 1) {
1057                                 elem_parse_failed = true;
1058                                 break;
1059                         }
1060                         elems->pwr_constr_elem = pos;
1061                         break;
1062                 case WLAN_EID_CISCO_VENDOR_SPECIFIC:
1063                         /* Lots of different options exist, but we only care
1064                          * about the Dynamic Transmit Power Control element.
1065                          * First check for the Cisco OUI, then for the DTPC
1066                          * tag (0x00).
1067                          */
1068                         if (elen < 4) {
1069                                 elem_parse_failed = true;
1070                                 break;
1071                         }
1072 
1073                         if (pos[0] != 0x00 || pos[1] != 0x40 ||
1074                             pos[2] != 0x96 || pos[3] != 0x00)
1075                                 break;
1076 
1077                         if (elen != 6) {
1078                                 elem_parse_failed = true;
1079                                 break;
1080                         }
1081 
1082                         if (calc_crc)
1083                                 crc = crc32_be(crc, pos - 2, elen + 2);
1084 
1085                         elems->cisco_dtpc_elem = pos;
1086                         break;
1087                 case WLAN_EID_TIMEOUT_INTERVAL:
1088                         if (elen >= sizeof(struct ieee80211_timeout_interval_ie))
1089                                 elems->timeout_int = (void *)pos;
1090                         else
1091                                 elem_parse_failed = true;
1092                         break;
1093                 case WLAN_EID_BSS_MAX_IDLE_PERIOD:
1094                         if (elen >= sizeof(*elems->max_idle_period_ie))
1095                                 elems->max_idle_period_ie = (void *)pos;
1096                         break;
1097                 default:
1098                         break;
1099                 }
1100 
1101                 if (elem_parse_failed)
1102                         elems->parse_error = true;
1103                 else
1104                         __set_bit(id, seen_elems);
1105 
1106                 left -= elen;
1107                 pos += elen;
1108         }
1109 
1110         if (left != 0)
1111                 elems->parse_error = true;
1112 
1113         return crc;
1114 }
1115 
1116 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata,
1117                                bool bss_notify, bool enable_qos)
1118 {
1119         struct ieee80211_local *local = sdata->local;
1120         struct ieee80211_tx_queue_params qparam;
1121         struct ieee80211_chanctx_conf *chanctx_conf;
1122         int ac;
1123         bool use_11b;
1124         bool is_ocb; /* Use another EDCA parameters if dot11OCBActivated=true */
1125         int aCWmin, aCWmax;
1126 
1127         if (!local->ops->conf_tx)
1128                 return;
1129 
1130         if (local->hw.queues < IEEE80211_NUM_ACS)
1131                 return;
1132 
1133         memset(&qparam, 0, sizeof(qparam));
1134 
1135         rcu_read_lock();
1136         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1137         use_11b = (chanctx_conf &&
1138                    chanctx_conf->def.chan->band == NL80211_BAND_2GHZ) &&
1139                  !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
1140         rcu_read_unlock();
1141 
1142         is_ocb = (sdata->vif.type == NL80211_IFTYPE_OCB);
1143 
1144         /* Set defaults according to 802.11-2007 Table 7-37 */
1145         aCWmax = 1023;
1146         if (use_11b)
1147                 aCWmin = 31;
1148         else
1149                 aCWmin = 15;
1150 
1151         /* Confiure old 802.11b/g medium access rules. */
1152         qparam.cw_max = aCWmax;
1153         qparam.cw_min = aCWmin;
1154         qparam.txop = 0;
1155         qparam.aifs = 2;
1156 
1157         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1158                 /* Update if QoS is enabled. */
1159                 if (enable_qos) {
1160                         switch (ac) {
1161                         case IEEE80211_AC_BK:
1162                                 qparam.cw_max = aCWmax;
1163                                 qparam.cw_min = aCWmin;
1164                                 qparam.txop = 0;
1165                                 if (is_ocb)
1166                                         qparam.aifs = 9;
1167                                 else
1168                                         qparam.aifs = 7;
1169                                 break;
1170                         /* never happens but let's not leave undefined */
1171                         default:
1172                         case IEEE80211_AC_BE:
1173                                 qparam.cw_max = aCWmax;
1174                                 qparam.cw_min = aCWmin;
1175                                 qparam.txop = 0;
1176                                 if (is_ocb)
1177                                         qparam.aifs = 6;
1178                                 else
1179                                         qparam.aifs = 3;
1180                                 break;
1181                         case IEEE80211_AC_VI:
1182                                 qparam.cw_max = aCWmin;
1183                                 qparam.cw_min = (aCWmin + 1) / 2 - 1;
1184                                 if (is_ocb)
1185                                         qparam.txop = 0;
1186                                 else if (use_11b)
1187                                         qparam.txop = 6016/32;
1188                                 else
1189                                         qparam.txop = 3008/32;
1190 
1191                                 if (is_ocb)
1192                                         qparam.aifs = 3;
1193                                 else
1194                                         qparam.aifs = 2;
1195                                 break;
1196                         case IEEE80211_AC_VO:
1197                                 qparam.cw_max = (aCWmin + 1) / 2 - 1;
1198                                 qparam.cw_min = (aCWmin + 1) / 4 - 1;
1199                                 if (is_ocb)
1200                                         qparam.txop = 0;
1201                                 else if (use_11b)
1202                                         qparam.txop = 3264/32;
1203                                 else
1204                                         qparam.txop = 1504/32;
1205                                 qparam.aifs = 2;
1206                                 break;
1207                         }
1208                 }
1209 
1210                 qparam.uapsd = false;
1211 
1212                 sdata->tx_conf[ac] = qparam;
1213                 drv_conf_tx(local, sdata, ac, &qparam);
1214         }
1215 
1216         if (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1217             sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
1218             sdata->vif.type != NL80211_IFTYPE_NAN) {
1219                 sdata->vif.bss_conf.qos = enable_qos;
1220                 if (bss_notify)
1221                         ieee80211_bss_info_change_notify(sdata,
1222                                                          BSS_CHANGED_QOS);
1223         }
1224 }
1225 
1226 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
1227                          u16 transaction, u16 auth_alg, u16 status,
1228                          const u8 *extra, size_t extra_len, const u8 *da,
1229                          const u8 *bssid, const u8 *key, u8 key_len, u8 key_idx,
1230                          u32 tx_flags)
1231 {
1232         struct ieee80211_local *local = sdata->local;
1233         struct sk_buff *skb;
1234         struct ieee80211_mgmt *mgmt;
1235         int err;
1236 
1237         /* 24 + 6 = header + auth_algo + auth_transaction + status_code */
1238         skb = dev_alloc_skb(local->hw.extra_tx_headroom + IEEE80211_WEP_IV_LEN +
1239                             24 + 6 + extra_len + IEEE80211_WEP_ICV_LEN);
1240         if (!skb)
1241                 return;
1242 
1243         skb_reserve(skb, local->hw.extra_tx_headroom + IEEE80211_WEP_IV_LEN);
1244 
1245         mgmt = skb_put_zero(skb, 24 + 6);
1246         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1247                                           IEEE80211_STYPE_AUTH);
1248         memcpy(mgmt->da, da, ETH_ALEN);
1249         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1250         memcpy(mgmt->bssid, bssid, ETH_ALEN);
1251         mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
1252         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
1253         mgmt->u.auth.status_code = cpu_to_le16(status);
1254         if (extra)
1255                 skb_put_data(skb, extra, extra_len);
1256 
1257         if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
1258                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
1259                 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
1260                 WARN_ON(err);
1261         }
1262 
1263         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1264                                         tx_flags;
1265         ieee80211_tx_skb(sdata, skb);
1266 }
1267 
1268 void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
1269                                     const u8 *bssid, u16 stype, u16 reason,
1270                                     bool send_frame, u8 *frame_buf)
1271 {
1272         struct ieee80211_local *local = sdata->local;
1273         struct sk_buff *skb;
1274         struct ieee80211_mgmt *mgmt = (void *)frame_buf;
1275 
1276         /* build frame */
1277         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
1278         mgmt->duration = 0; /* initialize only */
1279         mgmt->seq_ctrl = 0; /* initialize only */
1280         memcpy(mgmt->da, bssid, ETH_ALEN);
1281         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1282         memcpy(mgmt->bssid, bssid, ETH_ALEN);
1283         /* u.deauth.reason_code == u.disassoc.reason_code */
1284         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
1285 
1286         if (send_frame) {
1287                 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
1288                                     IEEE80211_DEAUTH_FRAME_LEN);
1289                 if (!skb)
1290                         return;
1291 
1292                 skb_reserve(skb, local->hw.extra_tx_headroom);
1293 
1294                 /* copy in frame */
1295                 skb_put_data(skb, mgmt, IEEE80211_DEAUTH_FRAME_LEN);
1296 
1297                 if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1298                     !(sdata->u.mgd.flags & IEEE80211_STA_MFP_ENABLED))
1299                         IEEE80211_SKB_CB(skb)->flags |=
1300                                 IEEE80211_TX_INTFL_DONT_ENCRYPT;
1301 
1302                 ieee80211_tx_skb(sdata, skb);
1303         }
1304 }
1305 
1306 static int ieee80211_build_preq_ies_band(struct ieee80211_local *local,
1307                                          u8 *buffer, size_t buffer_len,
1308                                          const u8 *ie, size_t ie_len,
1309                                          enum nl80211_band band,
1310                                          u32 rate_mask,
1311                                          struct cfg80211_chan_def *chandef,
1312                                          size_t *offset)
1313 {
1314         struct ieee80211_supported_band *sband;
1315         u8 *pos = buffer, *end = buffer + buffer_len;
1316         size_t noffset;
1317         int supp_rates_len, i;
1318         u8 rates[32];
1319         int num_rates;
1320         int ext_rates_len;
1321         int shift;
1322         u32 rate_flags;
1323         bool have_80mhz = false;
1324 
1325         *offset = 0;
1326 
1327         sband = local->hw.wiphy->bands[band];
1328         if (WARN_ON_ONCE(!sband))
1329                 return 0;
1330 
1331         rate_flags = ieee80211_chandef_rate_flags(chandef);
1332         shift = ieee80211_chandef_get_shift(chandef);
1333 
1334         num_rates = 0;
1335         for (i = 0; i < sband->n_bitrates; i++) {
1336                 if ((BIT(i) & rate_mask) == 0)
1337                         continue; /* skip rate */
1338                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1339                         continue;
1340 
1341                 rates[num_rates++] =
1342                         (u8) DIV_ROUND_UP(sband->bitrates[i].bitrate,
1343                                           (1 << shift) * 5);
1344         }
1345 
1346         supp_rates_len = min_t(int, num_rates, 8);
1347 
1348         if (end - pos < 2 + supp_rates_len)
1349                 goto out_err;
1350         *pos++ = WLAN_EID_SUPP_RATES;
1351         *pos++ = supp_rates_len;
1352         memcpy(pos, rates, supp_rates_len);
1353         pos += supp_rates_len;
1354 
1355         /* insert "request information" if in custom IEs */
1356         if (ie && ie_len) {
1357                 static const u8 before_extrates[] = {
1358                         WLAN_EID_SSID,
1359                         WLAN_EID_SUPP_RATES,
1360                         WLAN_EID_REQUEST,
1361                 };
1362                 noffset = ieee80211_ie_split(ie, ie_len,
1363                                              before_extrates,
1364                                              ARRAY_SIZE(before_extrates),
1365                                              *offset);
1366                 if (end - pos < noffset - *offset)
1367                         goto out_err;
1368                 memcpy(pos, ie + *offset, noffset - *offset);
1369                 pos += noffset - *offset;
1370                 *offset = noffset;
1371         }
1372 
1373         ext_rates_len = num_rates - supp_rates_len;
1374         if (ext_rates_len > 0) {
1375                 if (end - pos < 2 + ext_rates_len)
1376                         goto out_err;
1377                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1378                 *pos++ = ext_rates_len;
1379                 memcpy(pos, rates + supp_rates_len, ext_rates_len);
1380                 pos += ext_rates_len;
1381         }
1382 
1383         if (chandef->chan && sband->band == NL80211_BAND_2GHZ) {
1384                 if (end - pos < 3)
1385                         goto out_err;
1386                 *pos++ = WLAN_EID_DS_PARAMS;
1387                 *pos++ = 1;
1388                 *pos++ = ieee80211_frequency_to_channel(
1389                                 chandef->chan->center_freq);
1390         }
1391 
1392         /* insert custom IEs that go before HT */
1393         if (ie && ie_len) {
1394                 static const u8 before_ht[] = {
1395                         WLAN_EID_SSID,
1396                         WLAN_EID_SUPP_RATES,
1397                         WLAN_EID_REQUEST,
1398                         WLAN_EID_EXT_SUPP_RATES,
1399                         WLAN_EID_DS_PARAMS,
1400                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1401                 };
1402                 noffset = ieee80211_ie_split(ie, ie_len,
1403                                              before_ht, ARRAY_SIZE(before_ht),
1404                                              *offset);
1405                 if (end - pos < noffset - *offset)
1406                         goto out_err;
1407                 memcpy(pos, ie + *offset, noffset - *offset);
1408                 pos += noffset - *offset;
1409                 *offset = noffset;
1410         }
1411 
1412         if (sband->ht_cap.ht_supported) {
1413                 if (end - pos < 2 + sizeof(struct ieee80211_ht_cap))
1414                         goto out_err;
1415                 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
1416                                                 sband->ht_cap.cap);
1417         }
1418 
1419         /*
1420          * If adding more here, adjust code in main.c
1421          * that calculates local->scan_ies_len.
1422          */
1423 
1424         /* insert custom IEs that go before VHT */
1425         if (ie && ie_len) {
1426                 static const u8 before_vht[] = {
1427                         WLAN_EID_SSID,
1428                         WLAN_EID_SUPP_RATES,
1429                         WLAN_EID_REQUEST,
1430                         WLAN_EID_EXT_SUPP_RATES,
1431                         WLAN_EID_DS_PARAMS,
1432                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1433                         WLAN_EID_HT_CAPABILITY,
1434                         WLAN_EID_BSS_COEX_2040,
1435                         WLAN_EID_EXT_CAPABILITY,
1436                         WLAN_EID_SSID_LIST,
1437                         WLAN_EID_CHANNEL_USAGE,
1438                         WLAN_EID_INTERWORKING,
1439                         /* mesh ID can't happen here */
1440                         /* 60 GHz can't happen here right now */
1441                 };
1442                 noffset = ieee80211_ie_split(ie, ie_len,
1443                                              before_vht, ARRAY_SIZE(before_vht),
1444                                              *offset);
1445                 if (end - pos < noffset - *offset)
1446                         goto out_err;
1447                 memcpy(pos, ie + *offset, noffset - *offset);
1448                 pos += noffset - *offset;
1449                 *offset = noffset;
1450         }
1451 
1452         /* Check if any channel in this sband supports at least 80 MHz */
1453         for (i = 0; i < sband->n_channels; i++) {
1454                 if (sband->channels[i].flags & (IEEE80211_CHAN_DISABLED |
1455                                                 IEEE80211_CHAN_NO_80MHZ))
1456                         continue;
1457 
1458                 have_80mhz = true;
1459                 break;
1460         }
1461 
1462         if (sband->vht_cap.vht_supported && have_80mhz) {
1463                 if (end - pos < 2 + sizeof(struct ieee80211_vht_cap))
1464                         goto out_err;
1465                 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
1466                                                  sband->vht_cap.cap);
1467         }
1468 
1469         return pos - buffer;
1470  out_err:
1471         WARN_ONCE(1, "not enough space for preq IEs\n");
1472         return pos - buffer;
1473 }
1474 
1475 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
1476                              size_t buffer_len,
1477                              struct ieee80211_scan_ies *ie_desc,
1478                              const u8 *ie, size_t ie_len,
1479                              u8 bands_used, u32 *rate_masks,
1480                              struct cfg80211_chan_def *chandef)
1481 {
1482         size_t pos = 0, old_pos = 0, custom_ie_offset = 0;
1483         int i;
1484 
1485         memset(ie_desc, 0, sizeof(*ie_desc));
1486 
1487         for (i = 0; i < NUM_NL80211_BANDS; i++) {
1488                 if (bands_used & BIT(i)) {
1489                         pos += ieee80211_build_preq_ies_band(local,
1490                                                              buffer + pos,
1491                                                              buffer_len - pos,
1492                                                              ie, ie_len, i,
1493                                                              rate_masks[i],
1494                                                              chandef,
1495                                                              &custom_ie_offset);
1496                         ie_desc->ies[i] = buffer + old_pos;
1497                         ie_desc->len[i] = pos - old_pos;
1498                         old_pos = pos;
1499                 }
1500         }
1501 
1502         /* add any remaining custom IEs */
1503         if (ie && ie_len) {
1504                 if (WARN_ONCE(buffer_len - pos < ie_len - custom_ie_offset,
1505                               "not enough space for preq custom IEs\n"))
1506                         return pos;
1507                 memcpy(buffer + pos, ie + custom_ie_offset,
1508                        ie_len - custom_ie_offset);
1509                 ie_desc->common_ies = buffer + pos;
1510                 ie_desc->common_ie_len = ie_len - custom_ie_offset;
1511                 pos += ie_len - custom_ie_offset;
1512         }
1513 
1514         return pos;
1515 };
1516 
1517 struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
1518                                           const u8 *src, const u8 *dst,
1519                                           u32 ratemask,
1520                                           struct ieee80211_channel *chan,
1521                                           const u8 *ssid, size_t ssid_len,
1522                                           const u8 *ie, size_t ie_len,
1523                                           bool directed)
1524 {
1525         struct ieee80211_local *local = sdata->local;
1526         struct cfg80211_chan_def chandef;
1527         struct sk_buff *skb;
1528         struct ieee80211_mgmt *mgmt;
1529         int ies_len;
1530         u32 rate_masks[NUM_NL80211_BANDS] = {};
1531         struct ieee80211_scan_ies dummy_ie_desc;
1532 
1533         /*
1534          * Do not send DS Channel parameter for directed probe requests
1535          * in order to maximize the chance that we get a response.  Some
1536          * badly-behaved APs don't respond when this parameter is included.
1537          */
1538         chandef.width = sdata->vif.bss_conf.chandef.width;
1539         if (directed)
1540                 chandef.chan = NULL;
1541         else
1542                 chandef.chan = chan;
1543 
1544         skb = ieee80211_probereq_get(&local->hw, src, ssid, ssid_len,
1545                                      100 + ie_len);
1546         if (!skb)
1547                 return NULL;
1548 
1549         rate_masks[chan->band] = ratemask;
1550         ies_len = ieee80211_build_preq_ies(local, skb_tail_pointer(skb),
1551                                            skb_tailroom(skb), &dummy_ie_desc,
1552                                            ie, ie_len, BIT(chan->band),
1553                                            rate_masks, &chandef);
1554         skb_put(skb, ies_len);
1555 
1556         if (dst) {
1557                 mgmt = (struct ieee80211_mgmt *) skb->data;
1558                 memcpy(mgmt->da, dst, ETH_ALEN);
1559                 memcpy(mgmt->bssid, dst, ETH_ALEN);
1560         }
1561 
1562         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1563 
1564         return skb;
1565 }
1566 
1567 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata,
1568                               const u8 *src, const u8 *dst,
1569                               const u8 *ssid, size_t ssid_len,
1570                               const u8 *ie, size_t ie_len,
1571                               u32 ratemask, bool directed, u32 tx_flags,
1572                               struct ieee80211_channel *channel, bool scan)
1573 {
1574         struct sk_buff *skb;
1575 
1576         skb = ieee80211_build_probe_req(sdata, src, dst, ratemask, channel,
1577                                         ssid, ssid_len,
1578                                         ie, ie_len, directed);
1579         if (skb) {
1580                 IEEE80211_SKB_CB(skb)->flags |= tx_flags;
1581                 if (scan)
1582                         ieee80211_tx_skb_tid_band(sdata, skb, 7, channel->band);
1583                 else
1584                         ieee80211_tx_skb(sdata, skb);
1585         }
1586 }
1587 
1588 u32 ieee80211_sta_get_rates(struct ieee80211_sub_if_data *sdata,
1589                             struct ieee802_11_elems *elems,
1590                             enum nl80211_band band, u32 *basic_rates)
1591 {
1592         struct ieee80211_supported_band *sband;
1593         size_t num_rates;
1594         u32 supp_rates, rate_flags;
1595         int i, j, shift;
1596 
1597         sband = sdata->local->hw.wiphy->bands[band];
1598         if (WARN_ON(!sband))
1599                 return 1;
1600 
1601         rate_flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
1602         shift = ieee80211_vif_get_shift(&sdata->vif);
1603 
1604         num_rates = sband->n_bitrates;
1605         supp_rates = 0;
1606         for (i = 0; i < elems->supp_rates_len +
1607                      elems->ext_supp_rates_len; i++) {
1608                 u8 rate = 0;
1609                 int own_rate;
1610                 bool is_basic;
1611                 if (i < elems->supp_rates_len)
1612                         rate = elems->supp_rates[i];
1613                 else if (elems->ext_supp_rates)
1614                         rate = elems->ext_supp_rates
1615                                 [i - elems->supp_rates_len];
1616                 own_rate = 5 * (rate & 0x7f);
1617                 is_basic = !!(rate & 0x80);
1618 
1619                 if (is_basic && (rate & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1620                         continue;
1621 
1622                 for (j = 0; j < num_rates; j++) {
1623                         int brate;
1624                         if ((rate_flags & sband->bitrates[j].flags)
1625                             != rate_flags)
1626                                 continue;
1627 
1628                         brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
1629                                              1 << shift);
1630 
1631                         if (brate == own_rate) {
1632                                 supp_rates |= BIT(j);
1633                                 if (basic_rates && is_basic)
1634                                         *basic_rates |= BIT(j);
1635                         }
1636                 }
1637         }
1638         return supp_rates;
1639 }
1640 
1641 void ieee80211_stop_device(struct ieee80211_local *local)
1642 {
1643         ieee80211_led_radio(local, false);
1644         ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
1645 
1646         cancel_work_sync(&local->reconfig_filter);
1647 
1648         flush_workqueue(local->workqueue);
1649         drv_stop(local);
1650 }
1651 
1652 static void ieee80211_flush_completed_scan(struct ieee80211_local *local,
1653                                            bool aborted)
1654 {
1655         /* It's possible that we don't handle the scan completion in
1656          * time during suspend, so if it's still marked as completed
1657          * here, queue the work and flush it to clean things up.
1658          * Instead of calling the worker function directly here, we
1659          * really queue it to avoid potential races with other flows
1660          * scheduling the same work.
1661          */
1662         if (test_bit(SCAN_COMPLETED, &local->scanning)) {
1663                 /* If coming from reconfiguration failure, abort the scan so
1664                  * we don't attempt to continue a partial HW scan - which is
1665                  * possible otherwise if (e.g.) the 2.4 GHz portion was the
1666                  * completed scan, and a 5 GHz portion is still pending.
1667                  */
1668                 if (aborted)
1669                         set_bit(SCAN_ABORTED, &local->scanning);
1670                 ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0);
1671                 flush_delayed_work(&local->scan_work);
1672         }
1673 }
1674 
1675 static void ieee80211_handle_reconfig_failure(struct ieee80211_local *local)
1676 {
1677         struct ieee80211_sub_if_data *sdata;
1678         struct ieee80211_chanctx *ctx;
1679 
1680         /*
1681          * We get here if during resume the device can't be restarted properly.
1682          * We might also get here if this happens during HW reset, which is a
1683          * slightly different situation and we need to drop all connections in
1684          * the latter case.
1685          *
1686          * Ask cfg80211 to turn off all interfaces, this will result in more
1687          * warnings but at least we'll then get into a clean stopped state.
1688          */
1689 
1690         local->resuming = false;
1691         local->suspended = false;
1692         local->in_reconfig = false;
1693 
1694         ieee80211_flush_completed_scan(local, true);
1695 
1696         /* scheduled scan clearly can't be running any more, but tell
1697          * cfg80211 and clear local state
1698          */
1699         ieee80211_sched_scan_end(local);
1700 
1701         list_for_each_entry(sdata, &local->interfaces, list)
1702                 sdata->flags &= ~IEEE80211_SDATA_IN_DRIVER;
1703 
1704         /* Mark channel contexts as not being in the driver any more to avoid
1705          * removing them from the driver during the shutdown process...
1706          */
1707         mutex_lock(&local->chanctx_mtx);
1708         list_for_each_entry(ctx, &local->chanctx_list, list)
1709                 ctx->driver_present = false;
1710         mutex_unlock(&local->chanctx_mtx);
1711 
1712         cfg80211_shutdown_all_interfaces(local->hw.wiphy);
1713 }
1714 
1715 static void ieee80211_assign_chanctx(struct ieee80211_local *local,
1716                                      struct ieee80211_sub_if_data *sdata)
1717 {
1718         struct ieee80211_chanctx_conf *conf;
1719         struct ieee80211_chanctx *ctx;
1720 
1721         if (!local->use_chanctx)
1722                 return;
1723 
1724         mutex_lock(&local->chanctx_mtx);
1725         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1726                                          lockdep_is_held(&local->chanctx_mtx));
1727         if (conf) {
1728                 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1729                 drv_assign_vif_chanctx(local, sdata, ctx);
1730         }
1731         mutex_unlock(&local->chanctx_mtx);
1732 }
1733 
1734 static void ieee80211_reconfig_stations(struct ieee80211_sub_if_data *sdata)
1735 {
1736         struct ieee80211_local *local = sdata->local;
1737         struct sta_info *sta;
1738 
1739         /* add STAs back */
1740         mutex_lock(&local->sta_mtx);
1741         list_for_each_entry(sta, &local->sta_list, list) {
1742                 enum ieee80211_sta_state state;
1743 
1744                 if (!sta->uploaded || sta->sdata != sdata)
1745                         continue;
1746 
1747                 for (state = IEEE80211_STA_NOTEXIST;
1748                      state < sta->sta_state; state++)
1749                         WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1750                                               state + 1));
1751         }
1752         mutex_unlock(&local->sta_mtx);
1753 }
1754 
1755 static int ieee80211_reconfig_nan(struct ieee80211_sub_if_data *sdata)
1756 {
1757         struct cfg80211_nan_func *func, **funcs;
1758         int res, id, i = 0;
1759 
1760         res = drv_start_nan(sdata->local, sdata,
1761                             &sdata->u.nan.conf);
1762         if (WARN_ON(res))
1763                 return res;
1764 
1765         funcs = kzalloc((sdata->local->hw.max_nan_de_entries + 1) *
1766                         sizeof(*funcs), GFP_KERNEL);
1767         if (!funcs)
1768                 return -ENOMEM;
1769 
1770         /* Add all the functions:
1771          * This is a little bit ugly. We need to call a potentially sleeping
1772          * callback for each NAN function, so we can't hold the spinlock.
1773          */
1774         spin_lock_bh(&sdata->u.nan.func_lock);
1775 
1776         idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, id)
1777                 funcs[i++] = func;
1778 
1779         spin_unlock_bh(&sdata->u.nan.func_lock);
1780 
1781         for (i = 0; funcs[i]; i++) {
1782                 res = drv_add_nan_func(sdata->local, sdata, funcs[i]);
1783                 if (WARN_ON(res))
1784                         ieee80211_nan_func_terminated(&sdata->vif,
1785                                                       funcs[i]->instance_id,
1786                                                       NL80211_NAN_FUNC_TERM_REASON_ERROR,
1787                                                       GFP_KERNEL);
1788         }
1789 
1790         kfree(funcs);
1791 
1792         return 0;
1793 }
1794 
1795 int ieee80211_reconfig(struct ieee80211_local *local)
1796 {
1797         struct ieee80211_hw *hw = &local->hw;
1798         struct ieee80211_sub_if_data *sdata;
1799         struct ieee80211_chanctx *ctx;
1800         struct sta_info *sta;
1801         int res, i;
1802         bool reconfig_due_to_wowlan = false;
1803         struct ieee80211_sub_if_data *sched_scan_sdata;
1804         struct cfg80211_sched_scan_request *sched_scan_req;
1805         bool sched_scan_stopped = false;
1806         bool suspended = local->suspended;
1807 
1808         /* nothing to do if HW shouldn't run */
1809         if (!local->open_count)
1810                 goto wake_up;
1811 
1812 #ifdef CONFIG_PM
1813         if (suspended)
1814                 local->resuming = true;
1815 
1816         if (local->wowlan) {
1817                 /*
1818                  * In the wowlan case, both mac80211 and the device
1819                  * are functional when the resume op is called, so
1820                  * clear local->suspended so the device could operate
1821                  * normally (e.g. pass rx frames).
1822                  */
1823                 local->suspended = false;
1824                 res = drv_resume(local);
1825                 local->wowlan = false;
1826                 if (res < 0) {
1827                         local->resuming = false;
1828                         return res;
1829                 }
1830                 if (res == 0)
1831                         goto wake_up;
1832                 WARN_ON(res > 1);
1833                 /*
1834                  * res is 1, which means the driver requested
1835                  * to go through a regular reset on wakeup.
1836                  * restore local->suspended in this case.
1837                  */
1838                 reconfig_due_to_wowlan = true;
1839                 local->suspended = true;
1840         }
1841 #endif
1842 
1843         /*
1844          * In case of hw_restart during suspend (without wowlan),
1845          * cancel restart work, as we are reconfiguring the device
1846          * anyway.
1847          * Note that restart_work is scheduled on a frozen workqueue,
1848          * so we can't deadlock in this case.
1849          */
1850         if (suspended && local->in_reconfig && !reconfig_due_to_wowlan)
1851                 cancel_work_sync(&local->restart_work);
1852 
1853         local->started = false;
1854 
1855         /*
1856          * Upon resume hardware can sometimes be goofy due to
1857          * various platform / driver / bus issues, so restarting
1858          * the device may at times not work immediately. Propagate
1859          * the error.
1860          */
1861         res = drv_start(local);
1862         if (res) {
1863                 if (suspended)
1864                         WARN(1, "Hardware became unavailable upon resume. This could be a software issue prior to suspend or a hardware issue.\n");
1865                 else
1866                         WARN(1, "Hardware became unavailable during restart.\n");
1867                 ieee80211_handle_reconfig_failure(local);
1868                 return res;
1869         }
1870 
1871         /* setup fragmentation threshold */
1872         drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
1873 
1874         /* setup RTS threshold */
1875         drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1876 
1877         /* reset coverage class */
1878         drv_set_coverage_class(local, hw->wiphy->coverage_class);
1879 
1880         ieee80211_led_radio(local, true);
1881         ieee80211_mod_tpt_led_trig(local,
1882                                    IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1883 
1884         /* add interfaces */
1885         sdata = rtnl_dereference(local->monitor_sdata);
1886         if (sdata) {
1887                 /* in HW restart it exists already */
1888                 WARN_ON(local->resuming);
1889                 res = drv_add_interface(local, sdata);
1890                 if (WARN_ON(res)) {
1891                         RCU_INIT_POINTER(local->monitor_sdata, NULL);
1892                         synchronize_net();
1893                         kfree(sdata);
1894                 }
1895         }
1896 
1897         list_for_each_entry(sdata, &local->interfaces, list) {
1898                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1899                     sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1900                     ieee80211_sdata_running(sdata)) {
1901                         res = drv_add_interface(local, sdata);
1902                         if (WARN_ON(res))
1903                                 break;
1904                 }
1905         }
1906 
1907         /* If adding any of the interfaces failed above, roll back and
1908          * report failure.
1909          */
1910         if (res) {
1911                 list_for_each_entry_continue_reverse(sdata, &local->interfaces,
1912                                                      list)
1913                         if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1914                             sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1915                             ieee80211_sdata_running(sdata))
1916                                 drv_remove_interface(local, sdata);
1917                 ieee80211_handle_reconfig_failure(local);
1918                 return res;
1919         }
1920 
1921         /* add channel contexts */
1922         if (local->use_chanctx) {
1923                 mutex_lock(&local->chanctx_mtx);
1924                 list_for_each_entry(ctx, &local->chanctx_list, list)
1925                         if (ctx->replace_state !=
1926                             IEEE80211_CHANCTX_REPLACES_OTHER)
1927                                 WARN_ON(drv_add_chanctx(local, ctx));
1928                 mutex_unlock(&local->chanctx_mtx);
1929 
1930                 sdata = rtnl_dereference(local->monitor_sdata);
1931                 if (sdata && ieee80211_sdata_running(sdata))
1932                         ieee80211_assign_chanctx(local, sdata);
1933         }
1934 
1935         /* reconfigure hardware */
1936         ieee80211_hw_config(local, ~0);
1937 
1938         ieee80211_configure_filter(local);
1939 
1940         /* Finally also reconfigure all the BSS information */
1941         list_for_each_entry(sdata, &local->interfaces, list) {
1942                 u32 changed;
1943 
1944                 if (!ieee80211_sdata_running(sdata))
1945                         continue;
1946 
1947                 ieee80211_assign_chanctx(local, sdata);
1948 
1949                 switch (sdata->vif.type) {
1950                 case NL80211_IFTYPE_AP_VLAN:
1951                 case NL80211_IFTYPE_MONITOR:
1952                         break;
1953                 default:
1954                         ieee80211_reconfig_stations(sdata);
1955                         /* fall through */
1956                 case NL80211_IFTYPE_AP: /* AP stations are handled later */
1957                         for (i = 0; i < IEEE80211_NUM_ACS; i++)
1958                                 drv_conf_tx(local, sdata, i,
1959                                             &sdata->tx_conf[i]);
1960                         break;
1961                 }
1962 
1963                 /* common change flags for all interface types */
1964                 changed = BSS_CHANGED_ERP_CTS_PROT |
1965                           BSS_CHANGED_ERP_PREAMBLE |
1966                           BSS_CHANGED_ERP_SLOT |
1967                           BSS_CHANGED_HT |
1968                           BSS_CHANGED_BASIC_RATES |
1969                           BSS_CHANGED_BEACON_INT |
1970                           BSS_CHANGED_BSSID |
1971                           BSS_CHANGED_CQM |
1972                           BSS_CHANGED_QOS |
1973                           BSS_CHANGED_IDLE |
1974                           BSS_CHANGED_TXPOWER;
1975 
1976                 if (sdata->vif.mu_mimo_owner)
1977                         changed |= BSS_CHANGED_MU_GROUPS;
1978 
1979                 switch (sdata->vif.type) {
1980                 case NL80211_IFTYPE_STATION:
1981                         changed |= BSS_CHANGED_ASSOC |
1982                                    BSS_CHANGED_ARP_FILTER |
1983                                    BSS_CHANGED_PS;
1984 
1985                         /* Re-send beacon info report to the driver */
1986                         if (sdata->u.mgd.have_beacon)
1987                                 changed |= BSS_CHANGED_BEACON_INFO;
1988 
1989                         if (sdata->vif.bss_conf.max_idle_period ||
1990                             sdata->vif.bss_conf.protected_keep_alive)
1991                                 changed |= BSS_CHANGED_KEEP_ALIVE;
1992 
1993                         sdata_lock(sdata);
1994                         ieee80211_bss_info_change_notify(sdata, changed);
1995                         sdata_unlock(sdata);
1996                         break;
1997                 case NL80211_IFTYPE_OCB:
1998                         changed |= BSS_CHANGED_OCB;
1999                         ieee80211_bss_info_change_notify(sdata, changed);
2000                         break;
2001                 case NL80211_IFTYPE_ADHOC:
2002                         changed |= BSS_CHANGED_IBSS;
2003                         /* fall through */
2004                 case NL80211_IFTYPE_AP:
2005                         changed |= BSS_CHANGED_SSID | BSS_CHANGED_P2P_PS;
2006 
2007                         if (sdata->vif.type == NL80211_IFTYPE_AP) {
2008                                 changed |= BSS_CHANGED_AP_PROBE_RESP;
2009 
2010                                 if (rcu_access_pointer(sdata->u.ap.beacon))
2011                                         drv_start_ap(local, sdata);
2012                         }
2013 
2014                         /* fall through */
2015                 case NL80211_IFTYPE_MESH_POINT:
2016                         if (sdata->vif.bss_conf.enable_beacon) {
2017                                 changed |= BSS_CHANGED_BEACON |
2018                                            BSS_CHANGED_BEACON_ENABLED;
2019                                 ieee80211_bss_info_change_notify(sdata, changed);
2020                         }
2021                         break;
2022                 case NL80211_IFTYPE_NAN:
2023                         res = ieee80211_reconfig_nan(sdata);
2024                         if (res < 0) {
2025                                 ieee80211_handle_reconfig_failure(local);
2026                                 return res;
2027                         }
2028                         break;
2029                 case NL80211_IFTYPE_WDS:
2030                 case NL80211_IFTYPE_AP_VLAN:
2031                 case NL80211_IFTYPE_MONITOR:
2032                 case NL80211_IFTYPE_P2P_DEVICE:
2033                         /* nothing to do */
2034                         break;
2035                 case NL80211_IFTYPE_UNSPECIFIED:
2036                 case NUM_NL80211_IFTYPES:
2037                 case NL80211_IFTYPE_P2P_CLIENT:
2038                 case NL80211_IFTYPE_P2P_GO:
2039                         WARN_ON(1);
2040                         break;
2041                 }
2042         }
2043 
2044         ieee80211_recalc_ps(local);
2045 
2046         /*
2047          * The sta might be in psm against the ap (e.g. because
2048          * this was the state before a hw restart), so we
2049          * explicitly send a null packet in order to make sure
2050          * it'll sync against the ap (and get out of psm).
2051          */
2052         if (!(local->hw.conf.flags & IEEE80211_CONF_PS)) {
2053                 list_for_each_entry(sdata, &local->interfaces, list) {
2054                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
2055                                 continue;
2056                         if (!sdata->u.mgd.associated)
2057                                 continue;
2058 
2059                         ieee80211_send_nullfunc(local, sdata, false);
2060                 }
2061         }
2062 
2063         /* APs are now beaconing, add back stations */
2064         mutex_lock(&local->sta_mtx);
2065         list_for_each_entry(sta, &local->sta_list, list) {
2066                 enum ieee80211_sta_state state;
2067 
2068                 if (!sta->uploaded)
2069                         continue;
2070 
2071                 if (sta->sdata->vif.type != NL80211_IFTYPE_AP)
2072                         continue;
2073 
2074                 for (state = IEEE80211_STA_NOTEXIST;
2075                      state < sta->sta_state; state++)
2076                         WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
2077                                               state + 1));
2078         }
2079         mutex_unlock(&local->sta_mtx);
2080 
2081         /* add back keys */
2082         list_for_each_entry(sdata, &local->interfaces, list)
2083                 ieee80211_reset_crypto_tx_tailroom(sdata);
2084 
2085         list_for_each_entry(sdata, &local->interfaces, list)
2086                 if (ieee80211_sdata_running(sdata))
2087                         ieee80211_enable_keys(sdata);
2088 
2089         /* Reconfigure sched scan if it was interrupted by FW restart */
2090         mutex_lock(&local->mtx);
2091         sched_scan_sdata = rcu_dereference_protected(local->sched_scan_sdata,
2092                                                 lockdep_is_held(&local->mtx));
2093         sched_scan_req = rcu_dereference_protected(local->sched_scan_req,
2094                                                 lockdep_is_held(&local->mtx));
2095         if (sched_scan_sdata && sched_scan_req)
2096                 /*
2097                  * Sched scan stopped, but we don't want to report it. Instead,
2098                  * we're trying to reschedule. However, if more than one scan
2099                  * plan was set, we cannot reschedule since we don't know which
2100                  * scan plan was currently running (and some scan plans may have
2101                  * already finished).
2102                  */
2103                 if (sched_scan_req->n_scan_plans > 1 ||
2104                     __ieee80211_request_sched_scan_start(sched_scan_sdata,
2105                                                          sched_scan_req)) {
2106                         RCU_INIT_POINTER(local->sched_scan_sdata, NULL);
2107                         RCU_INIT_POINTER(local->sched_scan_req, NULL);
2108                         sched_scan_stopped = true;
2109                 }
2110         mutex_unlock(&local->mtx);
2111 
2112         if (sched_scan_stopped)
2113                 cfg80211_sched_scan_stopped_rtnl(local->hw.wiphy, 0);
2114 
2115  wake_up:
2116         if (local->in_reconfig) {
2117                 local->in_reconfig = false;
2118                 barrier();
2119 
2120                 /* Restart deferred ROCs */
2121                 mutex_lock(&local->mtx);
2122                 ieee80211_start_next_roc(local);
2123                 mutex_unlock(&local->mtx);
2124         }
2125 
2126         if (local->monitors == local->open_count && local->monitors > 0)
2127                 ieee80211_add_virtual_monitor(local);
2128 
2129         /*
2130          * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
2131          * sessions can be established after a resume.
2132          *
2133          * Also tear down aggregation sessions since reconfiguring
2134          * them in a hardware restart scenario is not easily done
2135          * right now, and the hardware will have lost information
2136          * about the sessions, but we and the AP still think they
2137          * are active. This is really a workaround though.
2138          */
2139         if (ieee80211_hw_check(hw, AMPDU_AGGREGATION)) {
2140                 mutex_lock(&local->sta_mtx);
2141 
2142                 list_for_each_entry(sta, &local->sta_list, list) {
2143                         if (!local->resuming)
2144                                 ieee80211_sta_tear_down_BA_sessions(
2145                                                 sta, AGG_STOP_LOCAL_REQUEST);
2146                         clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
2147                 }
2148 
2149                 mutex_unlock(&local->sta_mtx);
2150         }
2151 
2152         ieee80211_wake_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
2153                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND,
2154                                         false);
2155 
2156         /*
2157          * If this is for hw restart things are still running.
2158          * We may want to change that later, however.
2159          */
2160         if (local->open_count && (!suspended || reconfig_due_to_wowlan))
2161                 drv_reconfig_complete(local, IEEE80211_RECONFIG_TYPE_RESTART);
2162 
2163         if (!suspended)
2164                 return 0;
2165 
2166 #ifdef CONFIG_PM
2167         /* first set suspended false, then resuming */
2168         local->suspended = false;
2169         mb();
2170         local->resuming = false;
2171 
2172         ieee80211_flush_completed_scan(local, false);
2173 
2174         if (local->open_count && !reconfig_due_to_wowlan)
2175                 drv_reconfig_complete(local, IEEE80211_RECONFIG_TYPE_SUSPEND);
2176 
2177         list_for_each_entry(sdata, &local->interfaces, list) {
2178                 if (!ieee80211_sdata_running(sdata))
2179                         continue;
2180                 if (sdata->vif.type == NL80211_IFTYPE_STATION)
2181                         ieee80211_sta_restart(sdata);
2182         }
2183 
2184         mod_timer(&local->sta_cleanup, jiffies + 1);
2185 #else
2186         WARN_ON(1);
2187 #endif
2188 
2189         return 0;
2190 }
2191 
2192 void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
2193 {
2194         struct ieee80211_sub_if_data *sdata;
2195         struct ieee80211_local *local;
2196         struct ieee80211_key *key;
2197 
2198         if (WARN_ON(!vif))
2199                 return;
2200 
2201         sdata = vif_to_sdata(vif);
2202         local = sdata->local;
2203 
2204         if (WARN_ON(!local->resuming))
2205                 return;
2206 
2207         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2208                 return;
2209 
2210         sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;
2211 
2212         mutex_lock(&local->key_mtx);
2213         list_for_each_entry(key, &sdata->key_list, list)
2214                 key->flags |= KEY_FLAG_TAINTED;
2215         mutex_unlock(&local->key_mtx);
2216 }
2217 EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);
2218 
2219 void ieee80211_recalc_smps(struct ieee80211_sub_if_data *sdata)
2220 {
2221         struct ieee80211_local *local = sdata->local;
2222         struct ieee80211_chanctx_conf *chanctx_conf;
2223         struct ieee80211_chanctx *chanctx;
2224 
2225         mutex_lock(&local->chanctx_mtx);
2226 
2227         chanctx_conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
2228                                         lockdep_is_held(&local->chanctx_mtx));
2229 
2230         /*
2231          * This function can be called from a work, thus it may be possible
2232          * that the chanctx_conf is removed (due to a disconnection, for
2233          * example).
2234          * So nothing should be done in such case.
2235          */
2236         if (!chanctx_conf)
2237                 goto unlock;
2238 
2239         chanctx = container_of(chanctx_conf, struct ieee80211_chanctx, conf);
2240         ieee80211_recalc_smps_chanctx(local, chanctx);
2241  unlock:
2242         mutex_unlock(&local->chanctx_mtx);
2243 }
2244 
2245 void ieee80211_recalc_min_chandef(struct ieee80211_sub_if_data *sdata)
2246 {
2247         struct ieee80211_local *local = sdata->local;
2248         struct ieee80211_chanctx_conf *chanctx_conf;
2249         struct ieee80211_chanctx *chanctx;
2250 
2251         mutex_lock(&local->chanctx_mtx);
2252 
2253         chanctx_conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
2254                                         lockdep_is_held(&local->chanctx_mtx));
2255 
2256         if (WARN_ON_ONCE(!chanctx_conf))
2257                 goto unlock;
2258 
2259         chanctx = container_of(chanctx_conf, struct ieee80211_chanctx, conf);
2260         ieee80211_recalc_chanctx_min_def(local, chanctx);
2261  unlock:
2262         mutex_unlock(&local->chanctx_mtx);
2263 }
2264 
2265 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
2266 {
2267         size_t pos = offset;
2268 
2269         while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
2270                 pos += 2 + ies[pos + 1];
2271 
2272         return pos;
2273 }
2274 
2275 static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
2276                                             int rssi_min_thold,
2277                                             int rssi_max_thold)
2278 {
2279         trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);
2280 
2281         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2282                 return;
2283 
2284         /*
2285          * Scale up threshold values before storing it, as the RSSI averaging
2286          * algorithm uses a scaled up value as well. Change this scaling
2287          * factor if the RSSI averaging algorithm changes.
2288          */
2289         sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
2290         sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
2291 }
2292 
2293 void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
2294                                     int rssi_min_thold,
2295                                     int rssi_max_thold)
2296 {
2297         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2298 
2299         WARN_ON(rssi_min_thold == rssi_max_thold ||
2300                 rssi_min_thold > rssi_max_thold);
2301 
2302         _ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
2303                                        rssi_max_thold);
2304 }
2305 EXPORT_SYMBOL(ieee80211_enable_rssi_reports);
2306 
2307 void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
2308 {
2309         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2310 
2311         _ieee80211_enable_rssi_reports(sdata, 0, 0);
2312 }
2313 EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
2314 
2315 u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
2316                               u16 cap)
2317 {
2318         __le16 tmp;
2319 
2320         *pos++ = WLAN_EID_HT_CAPABILITY;
2321         *pos++ = sizeof(struct ieee80211_ht_cap);
2322         memset(pos, 0, sizeof(struct ieee80211_ht_cap));
2323 
2324         /* capability flags */
2325         tmp = cpu_to_le16(cap);
2326         memcpy(pos, &tmp, sizeof(u16));
2327         pos += sizeof(u16);
2328 
2329         /* AMPDU parameters */
2330         *pos++ = ht_cap->ampdu_factor |
2331                  (ht_cap->ampdu_density <<
2332                         IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
2333 
2334         /* MCS set */
2335         memcpy(pos, &ht_cap->mcs, sizeof(ht_cap->mcs));
2336         pos += sizeof(ht_cap->mcs);
2337 
2338         /* extended capabilities */
2339         pos += sizeof(__le16);
2340 
2341         /* BF capabilities */
2342         pos += sizeof(__le32);
2343 
2344         /* antenna selection */
2345         pos += sizeof(u8);
2346 
2347         return pos;
2348 }
2349 
2350 u8 *ieee80211_ie_build_vht_cap(u8 *pos, struct ieee80211_sta_vht_cap *vht_cap,
2351                                u32 cap)
2352 {
2353         __le32 tmp;
2354 
2355         *pos++ = WLAN_EID_VHT_CAPABILITY;
2356         *pos++ = sizeof(struct ieee80211_vht_cap);
2357         memset(pos, 0, sizeof(struct ieee80211_vht_cap));
2358 
2359         /* capability flags */
2360         tmp = cpu_to_le32(cap);
2361         memcpy(pos, &tmp, sizeof(u32));
2362         pos += sizeof(u32);
2363 
2364         /* VHT MCS set */
2365         memcpy(pos, &vht_cap->vht_mcs, sizeof(vht_cap->vht_mcs));
2366         pos += sizeof(vht_cap->vht_mcs);
2367 
2368         return pos;
2369 }
2370 
2371 u8 *ieee80211_ie_build_ht_oper(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
2372                                const struct cfg80211_chan_def *chandef,
2373                                u16 prot_mode, bool rifs_mode)
2374 {
2375         struct ieee80211_ht_operation *ht_oper;
2376         /* Build HT Information */
2377         *pos++ = WLAN_EID_HT_OPERATION;
2378         *pos++ = sizeof(struct ieee80211_ht_operation);
2379         ht_oper = (struct ieee80211_ht_operation *)pos;
2380         ht_oper->primary_chan = ieee80211_frequency_to_channel(
2381                                         chandef->chan->center_freq);
2382         switch (chandef->width) {
2383         case NL80211_CHAN_WIDTH_160:
2384         case NL80211_CHAN_WIDTH_80P80:
2385         case NL80211_CHAN_WIDTH_80:
2386         case NL80211_CHAN_WIDTH_40:
2387                 if (chandef->center_freq1 > chandef->chan->center_freq)
2388                         ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
2389                 else
2390                         ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
2391                 break;
2392         default:
2393                 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
2394                 break;
2395         }
2396         if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
2397             chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
2398             chandef->width != NL80211_CHAN_WIDTH_20)
2399                 ht_oper->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
2400 
2401         if (rifs_mode)
2402                 ht_oper->ht_param |= IEEE80211_HT_PARAM_RIFS_MODE;
2403 
2404         ht_oper->operation_mode = cpu_to_le16(prot_mode);
2405         ht_oper->stbc_param = 0x0000;
2406 
2407         /* It seems that Basic MCS set and Supported MCS set
2408            are identical for the first 10 bytes */
2409         memset(&ht_oper->basic_set, 0, 16);
2410         memcpy(&ht_oper->basic_set, &ht_cap->mcs, 10);
2411 
2412         return pos + sizeof(struct ieee80211_ht_operation);
2413 }
2414 
2415 void ieee80211_ie_build_wide_bw_cs(u8 *pos,
2416                                    const struct cfg80211_chan_def *chandef)
2417 {
2418         *pos++ = WLAN_EID_WIDE_BW_CHANNEL_SWITCH;       /* EID */
2419         *pos++ = 3;                                     /* IE length */
2420         /* New channel width */
2421         switch (chandef->width) {
2422         case NL80211_CHAN_WIDTH_80:
2423                 *pos++ = IEEE80211_VHT_CHANWIDTH_80MHZ;
2424                 break;
2425         case NL80211_CHAN_WIDTH_160:
2426                 *pos++ = IEEE80211_VHT_CHANWIDTH_160MHZ;
2427                 break;
2428         case NL80211_CHAN_WIDTH_80P80:
2429                 *pos++ = IEEE80211_VHT_CHANWIDTH_80P80MHZ;
2430                 break;
2431         default:
2432                 *pos++ = IEEE80211_VHT_CHANWIDTH_USE_HT;
2433         }
2434 
2435         /* new center frequency segment 0 */
2436         *pos++ = ieee80211_frequency_to_channel(chandef->center_freq1);
2437         /* new center frequency segment 1 */
2438         if (chandef->center_freq2)
2439                 *pos++ = ieee80211_frequency_to_channel(chandef->center_freq2);
2440         else
2441                 *pos++ = 0;
2442 }
2443 
2444 u8 *ieee80211_ie_build_vht_oper(u8 *pos, struct ieee80211_sta_vht_cap *vht_cap,
2445                                 const struct cfg80211_chan_def *chandef)
2446 {
2447         struct ieee80211_vht_operation *vht_oper;
2448 
2449         *pos++ = WLAN_EID_VHT_OPERATION;
2450         *pos++ = sizeof(struct ieee80211_vht_operation);
2451         vht_oper = (struct ieee80211_vht_operation *)pos;
2452         vht_oper->center_freq_seg0_idx = ieee80211_frequency_to_channel(
2453                                                         chandef->center_freq1);
2454         if (chandef->center_freq2)
2455                 vht_oper->center_freq_seg1_idx =
2456                         ieee80211_frequency_to_channel(chandef->center_freq2);
2457         else
2458                 vht_oper->center_freq_seg1_idx = 0x00;
2459 
2460         switch (chandef->width) {
2461         case NL80211_CHAN_WIDTH_160:
2462                 /*
2463                  * Convert 160 MHz channel width to new style as interop
2464                  * workaround.
2465                  */
2466                 vht_oper->chan_width = IEEE80211_VHT_CHANWIDTH_80MHZ;
2467                 vht_oper->center_freq_seg1_idx = vht_oper->center_freq_seg0_idx;
2468                 if (chandef->chan->center_freq < chandef->center_freq1)
2469                         vht_oper->center_freq_seg0_idx -= 8;
2470                 else
2471                         vht_oper->center_freq_seg0_idx += 8;
2472                 break;
2473         case NL80211_CHAN_WIDTH_80P80:
2474                 /*
2475                  * Convert 80+80 MHz channel width to new style as interop
2476                  * workaround.
2477                  */
2478                 vht_oper->chan_width = IEEE80211_VHT_CHANWIDTH_80MHZ;
2479                 break;
2480         case NL80211_CHAN_WIDTH_80:
2481                 vht_oper->chan_width = IEEE80211_VHT_CHANWIDTH_80MHZ;
2482                 break;
2483         default:
2484                 vht_oper->chan_width = IEEE80211_VHT_CHANWIDTH_USE_HT;
2485                 break;
2486         }
2487 
2488         /* don't require special VHT peer rates */
2489         vht_oper->basic_mcs_set = cpu_to_le16(0xffff);
2490 
2491         return pos + sizeof(struct ieee80211_vht_operation);
2492 }
2493 
2494 bool ieee80211_chandef_ht_oper(const struct ieee80211_ht_operation *ht_oper,
2495                                struct cfg80211_chan_def *chandef)
2496 {
2497         enum nl80211_channel_type channel_type;
2498 
2499         if (!ht_oper)
2500                 return false;
2501 
2502         switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
2503         case IEEE80211_HT_PARAM_CHA_SEC_NONE:
2504                 channel_type = NL80211_CHAN_HT20;
2505                 break;
2506         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
2507                 channel_type = NL80211_CHAN_HT40PLUS;
2508                 break;
2509         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
2510                 channel_type = NL80211_CHAN_HT40MINUS;
2511                 break;
2512         default:
2513                 channel_type = NL80211_CHAN_NO_HT;
2514                 return false;
2515         }
2516 
2517         cfg80211_chandef_create(chandef, chandef->chan, channel_type);
2518         return true;
2519 }
2520 
2521 bool ieee80211_chandef_vht_oper(const struct ieee80211_vht_operation *oper,
2522                                 struct cfg80211_chan_def *chandef)
2523 {
2524         struct cfg80211_chan_def new = *chandef;
2525         int cf1, cf2;
2526 
2527         if (!oper)
2528                 return false;
2529 
2530         cf1 = ieee80211_channel_to_frequency(oper->center_freq_seg0_idx,
2531                                              chandef->chan->band);
2532         cf2 = ieee80211_channel_to_frequency(oper->center_freq_seg1_idx,
2533                                              chandef->chan->band);
2534 
2535         switch (oper->chan_width) {
2536         case IEEE80211_VHT_CHANWIDTH_USE_HT:
2537                 break;
2538         case IEEE80211_VHT_CHANWIDTH_80MHZ:
2539                 new.width = NL80211_CHAN_WIDTH_80;
2540                 new.center_freq1 = cf1;
2541                 /* If needed, adjust based on the newer interop workaround. */
2542                 if (oper->center_freq_seg1_idx) {
2543                         unsigned int diff;
2544 
2545                         diff = abs(oper->center_freq_seg1_idx -
2546                                    oper->center_freq_seg0_idx);
2547                         if (diff == 8) {
2548                                 new.width = NL80211_CHAN_WIDTH_160;
2549                                 new.center_freq1 = cf2;
2550                         } else if (diff > 8) {
2551                                 new.width = NL80211_CHAN_WIDTH_80P80;
2552                                 new.center_freq2 = cf2;
2553                         }
2554                 }
2555                 break;
2556         case IEEE80211_VHT_CHANWIDTH_160MHZ:
2557                 new.width = NL80211_CHAN_WIDTH_160;
2558                 new.center_freq1 = cf1;
2559                 break;
2560         case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
2561                 new.width = NL80211_CHAN_WIDTH_80P80;
2562                 new.center_freq1 = cf1;
2563                 new.center_freq2 = cf2;
2564                 break;
2565         default:
2566                 return false;
2567         }
2568 
2569         if (!cfg80211_chandef_valid(&new))
2570                 return false;
2571 
2572         *chandef = new;
2573         return true;
2574 }
2575 
2576 int ieee80211_parse_bitrates(struct cfg80211_chan_def *chandef,
2577                              const struct ieee80211_supported_band *sband,
2578                              const u8 *srates, int srates_len, u32 *rates)
2579 {
2580         u32 rate_flags = ieee80211_chandef_rate_flags(chandef);
2581         int shift = ieee80211_chandef_get_shift(chandef);
2582         struct ieee80211_rate *br;
2583         int brate, rate, i, j, count = 0;
2584 
2585         *rates = 0;
2586 
2587         for (i = 0; i < srates_len; i++) {
2588                 rate = srates[i] & 0x7f;
2589 
2590                 for (j = 0; j < sband->n_bitrates; j++) {
2591                         br = &sband->bitrates[j];
2592                         if ((rate_flags & br->flags) != rate_flags)
2593                                 continue;
2594 
2595                         brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2596                         if (brate == rate) {
2597                                 *rates |= BIT(j);
2598                                 count++;
2599                                 break;
2600                         }
2601                 }
2602         }
2603         return count;
2604 }
2605 
2606 int ieee80211_add_srates_ie(struct ieee80211_sub_if_data *sdata,
2607                             struct sk_buff *skb, bool need_basic,
2608                             enum nl80211_band band)
2609 {
2610         struct ieee80211_local *local = sdata->local;
2611         struct ieee80211_supported_band *sband;
2612         int rate, shift;
2613         u8 i, rates, *pos;
2614         u32 basic_rates = sdata->vif.bss_conf.basic_rates;
2615         u32 rate_flags;
2616 
2617         shift = ieee80211_vif_get_shift(&sdata->vif);
2618         rate_flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
2619         sband = local->hw.wiphy->bands[band];
2620         rates = 0;
2621         for (i = 0; i < sband->n_bitrates; i++) {
2622                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
2623                         continue;
2624                 rates++;
2625         }
2626         if (rates > 8)
2627                 rates = 8;
2628 
2629         if (skb_tailroom(skb) < rates + 2)
2630                 return -ENOMEM;
2631 
2632         pos = skb_put(skb, rates + 2);
2633         *pos++ = WLAN_EID_SUPP_RATES;
2634         *pos++ = rates;
2635         for (i = 0; i < rates; i++) {
2636                 u8 basic = 0;
2637                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
2638                         continue;
2639 
2640                 if (need_basic && basic_rates & BIT(i))
2641                         basic = 0x80;
2642                 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
2643                                     5 * (1 << shift));
2644                 *pos++ = basic | (u8) rate;
2645         }
2646 
2647         return 0;
2648 }
2649 
2650 int ieee80211_add_ext_srates_ie(struct ieee80211_sub_if_data *sdata,
2651                                 struct sk_buff *skb, bool need_basic,
2652                                 enum nl80211_band band)
2653 {
2654         struct ieee80211_local *local = sdata->local;
2655         struct ieee80211_supported_band *sband;
2656         int rate, shift;
2657         u8 i, exrates, *pos;
2658         u32 basic_rates = sdata->vif.bss_conf.basic_rates;
2659         u32 rate_flags;
2660 
2661         rate_flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
2662         shift = ieee80211_vif_get_shift(&sdata->vif);
2663 
2664         sband = local->hw.wiphy->bands[band];
2665         exrates = 0;
2666         for (i = 0; i < sband->n_bitrates; i++) {
2667                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
2668                         continue;
2669                 exrates++;
2670         }
2671 
2672         if (exrates > 8)
2673                 exrates -= 8;
2674         else
2675                 exrates = 0;
2676 
2677         if (skb_tailroom(skb) < exrates + 2)
2678                 return -ENOMEM;
2679 
2680         if (exrates) {
2681                 pos = skb_put(skb, exrates + 2);
2682                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
2683                 *pos++ = exrates;
2684                 for (i = 8; i < sband->n_bitrates; i++) {
2685                         u8 basic = 0;
2686                         if ((rate_flags & sband->bitrates[i].flags)
2687                             != rate_flags)
2688                                 continue;
2689                         if (need_basic && basic_rates & BIT(i))
2690                                 basic = 0x80;
2691                         rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
2692                                             5 * (1 << shift));
2693                         *pos++ = basic | (u8) rate;
2694                 }
2695         }
2696         return 0;
2697 }
2698 
2699 int ieee80211_ave_rssi(struct ieee80211_vif *vif)
2700 {
2701         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2702         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2703 
2704         if (WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_STATION)) {
2705                 /* non-managed type inferfaces */
2706                 return 0;
2707         }
2708         return -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
2709 }
2710 EXPORT_SYMBOL_GPL(ieee80211_ave_rssi);
2711 
2712 u8 ieee80211_mcs_to_chains(const struct ieee80211_mcs_info *mcs)
2713 {
2714         if (!mcs)
2715                 return 1;
2716 
2717         /* TODO: consider rx_highest */
2718 
2719         if (mcs->rx_mask[3])
2720                 return 4;
2721         if (mcs->rx_mask[2])
2722                 return 3;
2723         if (mcs->rx_mask[1])
2724                 return 2;
2725         return 1;
2726 }
2727 
2728 /**
2729  * ieee80211_calculate_rx_timestamp - calculate timestamp in frame
2730  * @local: mac80211 hw info struct
2731  * @status: RX status
2732  * @mpdu_len: total MPDU length (including FCS)
2733  * @mpdu_offset: offset into MPDU to calculate timestamp at
2734  *
2735  * This function calculates the RX timestamp at the given MPDU offset, taking
2736  * into account what the RX timestamp was. An offset of 0 will just normalize
2737  * the timestamp to TSF at beginning of MPDU reception.
2738  */
2739 u64 ieee80211_calculate_rx_timestamp(struct ieee80211_local *local,
2740                                      struct ieee80211_rx_status *status,
2741                                      unsigned int mpdu_len,
2742                                      unsigned int mpdu_offset)
2743 {
2744         u64 ts = status->mactime;
2745         struct rate_info ri;
2746         u16 rate;
2747 
2748         if (WARN_ON(!ieee80211_have_rx_timestamp(status)))
2749                 return 0;
2750 
2751         memset(&ri, 0, sizeof(ri));
2752 
2753         /* Fill cfg80211 rate info */
2754         switch (status->encoding) {
2755         case RX_ENC_HT:
2756                 ri.mcs = status->rate_idx;
2757                 ri.flags |= RATE_INFO_FLAGS_MCS;
2758                 ri.bw = status->bw;
2759                 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
2760                         ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
2761                 break;
2762         case RX_ENC_VHT:
2763                 ri.flags |= RATE_INFO_FLAGS_VHT_MCS;
2764                 ri.mcs = status->rate_idx;
2765                 ri.nss = status->nss;
2766                 ri.bw = status->bw;
2767                 if (status->enc_flags & RX_ENC_FLAG_SHORT_GI)
2768                         ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
2769                 break;
2770         default:
2771                 WARN_ON(1);
2772                 /* fall through */
2773         case RX_ENC_LEGACY: {
2774                 struct ieee80211_supported_band *sband;
2775                 int shift = 0;
2776                 int bitrate;
2777 
2778                 ri.bw = status->bw;
2779 
2780                 switch (status->bw) {
2781                 case RATE_INFO_BW_10:
2782                         shift = 1;
2783                         break;
2784                 case RATE_INFO_BW_5:
2785                         shift = 2;
2786                         break;
2787                 }
2788 
2789                 sband = local->hw.wiphy->bands[status->band];
2790                 bitrate = sband->bitrates[status->rate_idx].bitrate;
2791                 ri.legacy = DIV_ROUND_UP(bitrate, (1 << shift));
2792 
2793                 if (status->flag & RX_FLAG_MACTIME_PLCP_START) {
2794                         /* TODO: handle HT/VHT preambles */
2795                         if (status->band == NL80211_BAND_5GHZ) {
2796                                 ts += 20 << shift;
2797                                 mpdu_offset += 2;
2798                         } else if (status->enc_flags & RX_ENC_FLAG_SHORTPRE) {
2799                                 ts += 96;
2800                         } else {
2801                                 ts += 192;
2802                         }
2803                 }
2804                 break;
2805                 }
2806         }
2807 
2808         rate = cfg80211_calculate_bitrate(&ri);
2809         if (WARN_ONCE(!rate,
2810                       "Invalid bitrate: flags=0x%llx, idx=%d, vht_nss=%d\n",
2811                       (unsigned long long)status->flag, status->rate_idx,
2812                       status->nss))
2813                 return 0;
2814 
2815         /* rewind from end of MPDU */
2816         if (status->flag & RX_FLAG_MACTIME_END)
2817                 ts -= mpdu_len * 8 * 10 / rate;
2818 
2819         ts += mpdu_offset * 8 * 10 / rate;
2820 
2821         return ts;
2822 }
2823 
2824 void ieee80211_dfs_cac_cancel(struct ieee80211_local *local)
2825 {
2826         struct ieee80211_sub_if_data *sdata;
2827         struct cfg80211_chan_def chandef;
2828 
2829         /* for interface list, to avoid linking iflist_mtx and chanctx_mtx */
2830         ASSERT_RTNL();
2831 
2832         mutex_lock(&local->mtx);
2833         list_for_each_entry(sdata, &local->interfaces, list) {
2834                 /* it might be waiting for the local->mtx, but then
2835                  * by the time it gets it, sdata->wdev.cac_started
2836                  * will no longer be true
2837                  */
2838                 cancel_delayed_work(&sdata->dfs_cac_timer_work);
2839 
2840                 if (sdata->wdev.cac_started) {
2841                         chandef = sdata->vif.bss_conf.chandef;
2842                         ieee80211_vif_release_channel(sdata);
2843                         cfg80211_cac_event(sdata->dev,
2844                                            &chandef,
2845                                            NL80211_RADAR_CAC_ABORTED,
2846                                            GFP_KERNEL);
2847                 }
2848         }
2849         mutex_unlock(&local->mtx);
2850 }
2851 
2852 void ieee80211_dfs_radar_detected_work(struct work_struct *work)
2853 {
2854         struct ieee80211_local *local =
2855                 container_of(work, struct ieee80211_local, radar_detected_work);
2856         struct cfg80211_chan_def chandef = local->hw.conf.chandef;
2857         struct ieee80211_chanctx *ctx;
2858         int num_chanctx = 0;
2859 
2860         mutex_lock(&local->chanctx_mtx);
2861         list_for_each_entry(ctx, &local->chanctx_list, list) {
2862                 if (ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER)
2863                         continue;
2864 
2865                 num_chanctx++;
2866                 chandef = ctx->conf.def;
2867         }
2868         mutex_unlock(&local->chanctx_mtx);
2869 
2870         rtnl_lock();
2871         ieee80211_dfs_cac_cancel(local);
2872         rtnl_unlock();
2873 
2874         if (num_chanctx > 1)
2875                 /* XXX: multi-channel is not supported yet */
2876                 WARN_ON(1);
2877         else
2878                 cfg80211_radar_event(local->hw.wiphy, &chandef, GFP_KERNEL);
2879 }
2880 
2881 void ieee80211_radar_detected(struct ieee80211_hw *hw)
2882 {
2883         struct ieee80211_local *local = hw_to_local(hw);
2884 
2885         trace_api_radar_detected(local);
2886 
2887         schedule_work(&local->radar_detected_work);
2888 }
2889 EXPORT_SYMBOL(ieee80211_radar_detected);
2890 
2891 u32 ieee80211_chandef_downgrade(struct cfg80211_chan_def *c)
2892 {
2893         u32 ret;
2894         int tmp;
2895 
2896         switch (c->width) {
2897         case NL80211_CHAN_WIDTH_20:
2898                 c->width = NL80211_CHAN_WIDTH_20_NOHT;
2899                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
2900                 break;
2901         case NL80211_CHAN_WIDTH_40:
2902                 c->width = NL80211_CHAN_WIDTH_20;
2903                 c->center_freq1 = c->chan->center_freq;
2904                 ret = IEEE80211_STA_DISABLE_40MHZ |
2905                       IEEE80211_STA_DISABLE_VHT;
2906                 break;
2907         case NL80211_CHAN_WIDTH_80:
2908                 tmp = (30 + c->chan->center_freq - c->center_freq1)/20;
2909                 /* n_P40 */
2910                 tmp /= 2;
2911                 /* freq_P40 */
2912                 c->center_freq1 = c->center_freq1 - 20 + 40 * tmp;
2913                 c->width = NL80211_CHAN_WIDTH_40;
2914                 ret = IEEE80211_STA_DISABLE_VHT;
2915                 break;
2916         case NL80211_CHAN_WIDTH_80P80:
2917                 c->center_freq2 = 0;
2918                 c->width = NL80211_CHAN_WIDTH_80;
2919                 ret = IEEE80211_STA_DISABLE_80P80MHZ |
2920                       IEEE80211_STA_DISABLE_160MHZ;
2921                 break;
2922         case NL80211_CHAN_WIDTH_160:
2923                 /* n_P20 */
2924                 tmp = (70 + c->chan->center_freq - c->center_freq1)/20;
2925                 /* n_P80 */
2926                 tmp /= 4;
2927                 c->center_freq1 = c->center_freq1 - 40 + 80 * tmp;
2928                 c->width = NL80211_CHAN_WIDTH_80;
2929                 ret = IEEE80211_STA_DISABLE_80P80MHZ |
2930                       IEEE80211_STA_DISABLE_160MHZ;
2931                 break;
2932         default:
2933         case NL80211_CHAN_WIDTH_20_NOHT:
2934                 WARN_ON_ONCE(1);
2935                 c->width = NL80211_CHAN_WIDTH_20_NOHT;
2936                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
2937                 break;
2938         case NL80211_CHAN_WIDTH_5:
2939         case NL80211_CHAN_WIDTH_10:
2940                 WARN_ON_ONCE(1);
2941                 /* keep c->width */
2942                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
2943                 break;
2944         }
2945 
2946         WARN_ON_ONCE(!cfg80211_chandef_valid(c));
2947 
2948         return ret;
2949 }
2950 
2951 /*
2952  * Returns true if smps_mode_new is strictly more restrictive than
2953  * smps_mode_old.
2954  */
2955 bool ieee80211_smps_is_restrictive(enum ieee80211_smps_mode smps_mode_old,
2956                                    enum ieee80211_smps_mode smps_mode_new)
2957 {
2958         if (WARN_ON_ONCE(smps_mode_old == IEEE80211_SMPS_AUTOMATIC ||
2959                          smps_mode_new == IEEE80211_SMPS_AUTOMATIC))
2960                 return false;
2961 
2962         switch (smps_mode_old) {
2963         case IEEE80211_SMPS_STATIC:
2964                 return false;
2965         case IEEE80211_SMPS_DYNAMIC:
2966                 return smps_mode_new == IEEE80211_SMPS_STATIC;
2967         case IEEE80211_SMPS_OFF:
2968                 return smps_mode_new != IEEE80211_SMPS_OFF;
2969         default:
2970                 WARN_ON(1);
2971         }
2972 
2973         return false;
2974 }
2975 
2976 int ieee80211_send_action_csa(struct ieee80211_sub_if_data *sdata,
2977                               struct cfg80211_csa_settings *csa_settings)
2978 {
2979         struct sk_buff *skb;
2980         struct ieee80211_mgmt *mgmt;
2981         struct ieee80211_local *local = sdata->local;
2982         int freq;
2983         int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.chan_switch) +
2984                                sizeof(mgmt->u.action.u.chan_switch);
2985         u8 *pos;
2986 
2987         if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2988             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2989                 return -EOPNOTSUPP;
2990 
2991         skb = dev_alloc_skb(local->tx_headroom + hdr_len +
2992                             5 + /* channel switch announcement element */
2993                             3 + /* secondary channel offset element */
2994                             5 + /* wide bandwidth channel switch announcement */
2995                             8); /* mesh channel switch parameters element */
2996         if (!skb)
2997                 return -ENOMEM;
2998 
2999         skb_reserve(skb, local->tx_headroom);
3000         mgmt = skb_put_zero(skb, hdr_len);
3001         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
3002                                           IEEE80211_STYPE_ACTION);
3003 
3004         eth_broadcast_addr(mgmt->da);
3005         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
3006         if (ieee80211_vif_is_mesh(&sdata->vif)) {
3007                 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
3008         } else {
3009                 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
3010                 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
3011         }
3012         mgmt->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT;
3013         mgmt->u.action.u.chan_switch.action_code = WLAN_ACTION_SPCT_CHL_SWITCH;
3014         pos = skb_put(skb, 5);
3015         *pos++ = WLAN_EID_CHANNEL_SWITCH;                       /* EID */
3016         *pos++ = 3;                                             /* IE length */
3017         *pos++ = csa_settings->block_tx ? 1 : 0;                /* CSA mode */
3018         freq = csa_settings->chandef.chan->center_freq;
3019         *pos++ = ieee80211_frequency_to_channel(freq);          /* channel */
3020         *pos++ = csa_settings->count;                           /* count */
3021 
3022         if (csa_settings->chandef.width == NL80211_CHAN_WIDTH_40) {
3023                 enum nl80211_channel_type ch_type;
3024 
3025                 skb_put(skb, 3);
3026                 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;     /* EID */
3027                 *pos++ = 1;                                     /* IE length */
3028                 ch_type = cfg80211_get_chandef_type(&csa_settings->chandef);
3029                 if (ch_type == NL80211_CHAN_HT40PLUS)
3030                         *pos++ = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
3031                 else
3032                         *pos++ = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
3033         }
3034 
3035         if (ieee80211_vif_is_mesh(&sdata->vif)) {
3036                 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
3037 
3038                 skb_put(skb, 8);
3039                 *pos++ = WLAN_EID_CHAN_SWITCH_PARAM;            /* EID */
3040                 *pos++ = 6;                                     /* IE length */
3041                 *pos++ = sdata->u.mesh.mshcfg.dot11MeshTTL;     /* Mesh TTL */
3042                 *pos = 0x00;    /* Mesh Flag: Tx Restrict, Initiator, Reason */
3043                 *pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
3044                 *pos++ |= csa_settings->block_tx ?
3045                           WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00;
3046                 put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos); /* Reason Cd */
3047                 pos += 2;
3048                 put_unaligned_le16(ifmsh->pre_value, pos);/* Precedence Value */
3049                 pos += 2;
3050         }
3051 
3052         if (csa_settings->chandef.width == NL80211_CHAN_WIDTH_80 ||
3053             csa_settings->chandef.width == NL80211_CHAN_WIDTH_80P80 ||
3054             csa_settings->chandef.width == NL80211_CHAN_WIDTH_160) {
3055                 skb_put(skb, 5);
3056                 ieee80211_ie_build_wide_bw_cs(pos, &csa_settings->chandef);
3057         }
3058 
3059         ieee80211_tx_skb(sdata, skb);
3060         return 0;
3061 }
3062 
3063 bool ieee80211_cs_valid(const struct ieee80211_cipher_scheme *cs)
3064 {
3065         return !(cs == NULL || cs->cipher == 0 ||
3066                  cs->hdr_len < cs->pn_len + cs->pn_off ||
3067                  cs->hdr_len <= cs->key_idx_off ||
3068                  cs->key_idx_shift > 7 ||
3069                  cs->key_idx_mask == 0);
3070 }
3071 
3072 bool ieee80211_cs_list_valid(const struct ieee80211_cipher_scheme *cs, int n)
3073 {
3074         int i;
3075 
3076         /* Ensure we have enough iftype bitmap space for all iftype values */
3077         WARN_ON((NUM_NL80211_IFTYPES / 8 + 1) > sizeof(cs[0].iftype));
3078 
3079         for (i = 0; i < n; i++)
3080                 if (!ieee80211_cs_valid(&cs[i]))
3081                         return false;
3082 
3083         return true;
3084 }
3085 
3086 const struct ieee80211_cipher_scheme *
3087 ieee80211_cs_get(struct ieee80211_local *local, u32 cipher,
3088                  enum nl80211_iftype iftype)
3089 {
3090         const struct ieee80211_cipher_scheme *l = local->hw.cipher_schemes;
3091         int n = local->hw.n_cipher_schemes;
3092         int i;
3093         const struct ieee80211_cipher_scheme *cs = NULL;
3094 
3095         for (i = 0; i < n; i++) {
3096                 if (l[i].cipher == cipher) {
3097                         cs = &l[i];
3098                         break;
3099                 }
3100         }
3101 
3102         if (!cs || !(cs->iftype & BIT(iftype)))
3103                 return NULL;
3104 
3105         return cs;
3106 }
3107 
3108 int ieee80211_cs_headroom(struct ieee80211_local *local,
3109                           struct cfg80211_crypto_settings *crypto,
3110                           enum nl80211_iftype iftype)
3111 {
3112         const struct ieee80211_cipher_scheme *cs;
3113         int headroom = IEEE80211_ENCRYPT_HEADROOM;
3114         int i;
3115 
3116         for (i = 0; i < crypto->n_ciphers_pairwise; i++) {
3117                 cs = ieee80211_cs_get(local, crypto->ciphers_pairwise[i],
3118                                       iftype);
3119 
3120                 if (cs && headroom < cs->hdr_len)
3121                         headroom = cs->hdr_len;
3122         }
3123 
3124         cs = ieee80211_cs_get(local, crypto->cipher_group, iftype);
3125         if (cs && headroom < cs->hdr_len)
3126                 headroom = cs->hdr_len;
3127 
3128         return headroom;
3129 }
3130 
3131 static bool
3132 ieee80211_extend_noa_desc(struct ieee80211_noa_data *data, u32 tsf, int i)
3133 {
3134         s32 end = data->desc[i].start + data->desc[i].duration - (tsf + 1);
3135         int skip;
3136 
3137         if (end > 0)
3138                 return false;
3139 
3140         /* One shot NOA  */
3141         if (data->count[i] == 1)
3142                 return false;
3143 
3144         if (data->desc[i].interval == 0)
3145                 return false;
3146 
3147         /* End time is in the past, check for repetitions */
3148         skip = DIV_ROUND_UP(-end, data->desc[i].interval);
3149         if (data->count[i] < 255) {
3150                 if (data->count[i] <= skip) {
3151                         data->count[i] = 0;
3152                         return false;
3153                 }
3154 
3155                 data->count[i] -= skip;
3156         }
3157 
3158         data->desc[i].start += skip * data->desc[i].interval;
3159 
3160         return true;
3161 }
3162 
3163 static bool
3164 ieee80211_extend_absent_time(struct ieee80211_noa_data *data, u32 tsf,
3165                              s32 *offset)
3166 {
3167         bool ret = false;
3168         int i;
3169 
3170         for (i = 0; i < IEEE80211_P2P_NOA_DESC_MAX; i++) {
3171                 s32 cur;
3172 
3173                 if (!data->count[i])
3174                         continue;
3175 
3176                 if (ieee80211_extend_noa_desc(data, tsf + *offset, i))
3177                         ret = true;
3178 
3179                 cur = data->desc[i].start - tsf;
3180                 if (cur > *offset)
3181                         continue;
3182 
3183                 cur = data->desc[i].start + data->desc[i].duration - tsf;
3184                 if (cur > *offset)
3185                         *offset = cur;
3186         }
3187 
3188         return ret;
3189 }
3190 
3191 static u32
3192 ieee80211_get_noa_absent_time(struct ieee80211_noa_data *data, u32 tsf)
3193 {
3194         s32 offset = 0;
3195         int tries = 0;
3196         /*
3197          * arbitrary limit, used to avoid infinite loops when combined NoA
3198          * descriptors cover the full time period.
3199          */
3200         int max_tries = 5;
3201 
3202         ieee80211_extend_absent_time(data, tsf, &offset);
3203         do {
3204                 if (!ieee80211_extend_absent_time(data, tsf, &offset))
3205                         break;
3206 
3207                 tries++;
3208         } while (tries < max_tries);
3209 
3210         return offset;
3211 }
3212 
3213 void ieee80211_update_p2p_noa(struct ieee80211_noa_data *data, u32 tsf)
3214 {
3215         u32 next_offset = BIT(31) - 1;
3216         int i;
3217 
3218         data->absent = 0;
3219         data->has_next_tsf = false;
3220         for (i = 0; i < IEEE80211_P2P_NOA_DESC_MAX; i++) {
3221                 s32 start;
3222 
3223                 if (!data->count[i])
3224                         continue;
3225 
3226                 ieee80211_extend_noa_desc(data, tsf, i);
3227                 start = data->desc[i].start - tsf;
3228                 if (start <= 0)
3229                         data->absent |= BIT(i);
3230 
3231                 if (next_offset > start)
3232                         next_offset = start;
3233 
3234                 data->has_next_tsf = true;
3235         }
3236 
3237         if (data->absent)
3238                 next_offset = ieee80211_get_noa_absent_time(data, tsf);
3239 
3240         data->next_tsf = tsf + next_offset;
3241 }
3242 EXPORT_SYMBOL(ieee80211_update_p2p_noa);
3243 
3244 int ieee80211_parse_p2p_noa(const struct ieee80211_p2p_noa_attr *attr,
3245                             struct ieee80211_noa_data *data, u32 tsf)
3246 {
3247         int ret = 0;
3248         int i;
3249 
3250         memset(data, 0, sizeof(*data));
3251 
3252         for (i = 0; i < IEEE80211_P2P_NOA_DESC_MAX; i++) {
3253                 const struct ieee80211_p2p_noa_desc *desc = &attr->desc[i];
3254 
3255                 if (!desc->count || !desc->duration)
3256                         continue;
3257 
3258                 data->count[i] = desc->count;
3259                 data->desc[i].start = le32_to_cpu(desc->start_time);
3260                 data->desc[i].duration = le32_to_cpu(desc->duration);
3261                 data->desc[i].interval = le32_to_cpu(desc->interval);
3262 
3263                 if (data->count[i] > 1 &&
3264                     data->desc[i].interval < data->desc[i].duration)
3265                         continue;
3266 
3267                 ieee80211_extend_noa_desc(data, tsf, i);
3268                 ret++;
3269         }
3270 
3271         if (ret)
3272                 ieee80211_update_p2p_noa(data, tsf);
3273 
3274         return ret;
3275 }
3276 EXPORT_SYMBOL(ieee80211_parse_p2p_noa);
3277 
3278 void ieee80211_recalc_dtim(struct ieee80211_local *local,
3279                            struct ieee80211_sub_if_data *sdata)
3280 {
3281         u64 tsf = drv_get_tsf(local, sdata);
3282         u64 dtim_count = 0;
3283         u16 beacon_int = sdata->vif.bss_conf.beacon_int * 1024;
3284         u8 dtim_period = sdata->vif.bss_conf.dtim_period;
3285         struct ps_data *ps;
3286         u8 bcns_from_dtim;
3287 
3288         if (tsf == -1ULL || !beacon_int || !dtim_period)
3289                 return;
3290 
3291         if (sdata->vif.type == NL80211_IFTYPE_AP ||
3292             sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
3293                 if (!sdata->bss)
3294                         return;
3295 
3296                 ps = &sdata->bss->ps;
3297         } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
3298                 ps = &sdata->u.mesh.ps;
3299         } else {
3300                 return;
3301         }
3302 
3303         /*
3304          * actually finds last dtim_count, mac80211 will update in
3305          * __beacon_add_tim().
3306          * dtim_count = dtim_period - (tsf / bcn_int) % dtim_period
3307          */
3308         do_div(tsf, beacon_int);
3309         bcns_from_dtim = do_div(tsf, dtim_period);
3310         /* just had a DTIM */
3311         if (!bcns_from_dtim)
3312                 dtim_count = 0;
3313         else
3314                 dtim_count = dtim_period - bcns_from_dtim;
3315 
3316         ps->dtim_count = dtim_count;
3317 }
3318 
3319 static u8 ieee80211_chanctx_radar_detect(struct ieee80211_local *local,
3320                                          struct ieee80211_chanctx *ctx)
3321 {
3322         struct ieee80211_sub_if_data *sdata;
3323         u8 radar_detect = 0;
3324 
3325         lockdep_assert_held(&local->chanctx_mtx);
3326 
3327         if (WARN_ON(ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED))
3328                 return 0;
3329 
3330         list_for_each_entry(sdata, &ctx->reserved_vifs, reserved_chanctx_list)
3331                 if (sdata->reserved_radar_required)
3332                         radar_detect |= BIT(sdata->reserved_chandef.width);
3333 
3334         /*
3335          * An in-place reservation context should not have any assigned vifs
3336          * until it replaces the other context.
3337          */
3338         WARN_ON(ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER &&
3339                 !list_empty(&ctx->assigned_vifs));
3340 
3341         list_for_each_entry(sdata, &ctx->assigned_vifs, assigned_chanctx_list)
3342                 if (sdata->radar_required)
3343                         radar_detect |= BIT(sdata->vif.bss_conf.chandef.width);
3344 
3345         return radar_detect;
3346 }
3347 
3348 int ieee80211_check_combinations(struct ieee80211_sub_if_data *sdata,
3349                                  const struct cfg80211_chan_def *chandef,
3350                                  enum ieee80211_chanctx_mode chanmode,
3351                                  u8 radar_detect)
3352 {
3353         struct ieee80211_local *local = sdata->local;
3354         struct ieee80211_sub_if_data *sdata_iter;
3355         enum nl80211_iftype iftype = sdata->wdev.iftype;
3356         struct ieee80211_chanctx *ctx;
3357         int total = 1;
3358         struct iface_combination_params params = {
3359                 .radar_detect = radar_detect,
3360         };
3361 
3362         lockdep_assert_held(&local->chanctx_mtx);
3363 
3364         if (WARN_ON(hweight32(radar_detect) > 1))
3365                 return -EINVAL;
3366 
3367         if (WARN_ON(chandef && chanmode == IEEE80211_CHANCTX_SHARED &&
3368                     !chandef->chan))
3369                 return -EINVAL;
3370 
3371         if (WARN_ON(iftype >= NUM_NL80211_IFTYPES))
3372                 return -EINVAL;
3373 
3374         if (sdata->vif.type == NL80211_IFTYPE_AP ||
3375             sdata->vif.type == NL80211_IFTYPE_MESH_POINT) {
3376                 /*
3377                  * always passing this is harmless, since it'll be the
3378                  * same value that cfg80211 finds if it finds the same
3379                  * interface ... and that's always allowed
3380                  */
3381                 params.new_beacon_int = sdata->vif.bss_conf.beacon_int;
3382         }
3383 
3384         /* Always allow software iftypes */
3385         if (local->hw.wiphy->software_iftypes & BIT(iftype)) {
3386                 if (radar_detect)
3387                         return -EINVAL;
3388                 return 0;
3389         }
3390 
3391         if (chandef)
3392                 params.num_different_channels = 1;
3393 
3394         if (iftype != NL80211_IFTYPE_UNSPECIFIED)
3395                 params.iftype_num[iftype] = 1;
3396 
3397         list_for_each_entry(ctx, &local->chanctx_list, list) {
3398                 if (ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED)
3399                         continue;
3400                 params.radar_detect |=
3401                         ieee80211_chanctx_radar_detect(local, ctx);
3402                 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE) {
3403                         params.num_different_channels++;
3404                         continue;
3405                 }
3406                 if (chandef && chanmode == IEEE80211_CHANCTX_SHARED &&
3407                     cfg80211_chandef_compatible(chandef,
3408                                                 &ctx->conf.def))
3409                         continue;
3410                 params.num_different_channels++;
3411         }
3412 
3413         list_for_each_entry_rcu(sdata_iter, &local->interfaces, list) {
3414                 struct wireless_dev *wdev_iter;
3415 
3416                 wdev_iter = &sdata_iter->wdev;
3417 
3418                 if (sdata_iter == sdata ||
3419                     !ieee80211_sdata_running(sdata_iter) ||
3420                     local->hw.wiphy->software_iftypes & BIT(wdev_iter->iftype))
3421                         continue;
3422 
3423                 params.iftype_num[wdev_iter->iftype]++;
3424                 total++;
3425         }
3426 
3427         if (total == 1 && !params.radar_detect)
3428                 return 0;
3429 
3430         return cfg80211_check_combinations(local->hw.wiphy, &params);
3431 }
3432 
3433 static void
3434 ieee80211_iter_max_chans(const struct ieee80211_iface_combination *c,
3435                          void *data)
3436 {
3437         u32 *max_num_different_channels = data;
3438 
3439         *max_num_different_channels = max(*max_num_different_channels,
3440                                           c->num_different_channels);
3441 }
3442 
3443 int ieee80211_max_num_channels(struct ieee80211_local *local)
3444 {
3445         struct ieee80211_sub_if_data *sdata;
3446         struct ieee80211_chanctx *ctx;
3447         u32 max_num_different_channels = 1;
3448         int err;
3449         struct iface_combination_params params = {0};
3450 
3451         lockdep_assert_held(&local->chanctx_mtx);
3452 
3453         list_for_each_entry(ctx, &local->chanctx_list, list) {
3454                 if (ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED)
3455                         continue;
3456 
3457                 params.num_different_channels++;
3458 
3459                 params.radar_detect |=
3460                         ieee80211_chanctx_radar_detect(local, ctx);
3461         }
3462 
3463         list_for_each_entry_rcu(sdata, &local->interfaces, list)
3464                 params.iftype_num[sdata->wdev.iftype]++;
3465 
3466         err = cfg80211_iter_combinations(local->hw.wiphy, &params,
3467                                          ieee80211_iter_max_chans,
3468                                          &max_num_different_channels);
3469         if (err < 0)
3470                 return err;
3471 
3472         return max_num_different_channels;
3473 }
3474 
3475 u8 *ieee80211_add_wmm_info_ie(u8 *buf, u8 qosinfo)
3476 {
3477         *buf++ = WLAN_EID_VENDOR_SPECIFIC;
3478         *buf++ = 7; /* len */
3479         *buf++ = 0x00; /* Microsoft OUI 00:50:F2 */
3480         *buf++ = 0x50;
3481         *buf++ = 0xf2;
3482         *buf++ = 2; /* WME */
3483         *buf++ = 0; /* WME info */
3484         *buf++ = 1; /* WME ver */
3485         *buf++ = qosinfo; /* U-APSD no in use */
3486 
3487         return buf;
3488 }
3489 
3490 void ieee80211_txq_get_depth(struct ieee80211_txq *txq,
3491                              unsigned long *frame_cnt,
3492                              unsigned long *byte_cnt)
3493 {
3494         struct txq_info *txqi = to_txq_info(txq);
3495         u32 frag_cnt = 0, frag_bytes = 0;
3496         struct sk_buff *skb;
3497 
3498         skb_queue_walk(&txqi->frags, skb) {
3499                 frag_cnt++;
3500                 frag_bytes += skb->len;
3501         }
3502 
3503         if (frame_cnt)
3504                 *frame_cnt = txqi->tin.backlog_packets + frag_cnt;
3505 
3506         if (byte_cnt)
3507                 *byte_cnt = txqi->tin.backlog_bytes + frag_bytes;
3508 }
3509 EXPORT_SYMBOL(ieee80211_txq_get_depth);
3510 
3511 const u8 ieee80211_ac_to_qos_mask[IEEE80211_NUM_ACS] = {
3512         IEEE80211_WMM_IE_STA_QOSINFO_AC_VO,
3513         IEEE80211_WMM_IE_STA_QOSINFO_AC_VI,
3514         IEEE80211_WMM_IE_STA_QOSINFO_AC_BE,
3515         IEEE80211_WMM_IE_STA_QOSINFO_AC_BK
3516 };
3517 

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