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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) 2015-2016      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 ieee80211_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 == IEEE80211_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 ieee80211_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->hw.queues < IEEE80211_NUM_ACS)
248                 n_acs = 1;
249 
250         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
251                 int ac;
252 
253                 if (!sdata->dev)
254                         continue;
255 
256                 if (sdata->vif.cab_queue != IEEE80211_INVAL_HW_QUEUE &&
257                     local->queue_stop_reasons[sdata->vif.cab_queue] != 0)
258                         continue;
259 
260                 for (ac = 0; ac < n_acs; ac++) {
261                         int ac_queue = sdata->vif.hw_queue[ac];
262 
263                         if (local->ops->wake_tx_queue &&
264                             (atomic_read(&sdata->txqs_len[ac]) >
265                              local->hw.txq_ac_max_pending))
266                                 continue;
267 
268                         if (ac_queue == queue ||
269                             (sdata->vif.cab_queue == queue &&
270                              local->queue_stop_reasons[ac_queue] == 0 &&
271                              skb_queue_empty(&local->pending[ac_queue])))
272                                 netif_wake_subqueue(sdata->dev, ac);
273                 }
274         }
275 }
276 
277 static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
278                                    enum queue_stop_reason reason,
279                                    bool refcounted)
280 {
281         struct ieee80211_local *local = hw_to_local(hw);
282 
283         trace_wake_queue(local, queue, reason);
284 
285         if (WARN_ON(queue >= hw->queues))
286                 return;
287 
288         if (!test_bit(reason, &local->queue_stop_reasons[queue]))
289                 return;
290 
291         if (!refcounted) {
292                 local->q_stop_reasons[queue][reason] = 0;
293         } else {
294                 local->q_stop_reasons[queue][reason]--;
295                 if (WARN_ON(local->q_stop_reasons[queue][reason] < 0))
296                         local->q_stop_reasons[queue][reason] = 0;
297         }
298 
299         if (local->q_stop_reasons[queue][reason] == 0)
300                 __clear_bit(reason, &local->queue_stop_reasons[queue]);
301 
302         if (local->queue_stop_reasons[queue] != 0)
303                 /* someone still has this queue stopped */
304                 return;
305 
306         if (skb_queue_empty(&local->pending[queue])) {
307                 rcu_read_lock();
308                 ieee80211_propagate_queue_wake(local, queue);
309                 rcu_read_unlock();
310         } else
311                 tasklet_schedule(&local->tx_pending_tasklet);
312 }
313 
314 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
315                                     enum queue_stop_reason reason,
316                                     bool refcounted)
317 {
318         struct ieee80211_local *local = hw_to_local(hw);
319         unsigned long flags;
320 
321         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
322         __ieee80211_wake_queue(hw, queue, reason, refcounted);
323         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
324 }
325 
326 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
327 {
328         ieee80211_wake_queue_by_reason(hw, queue,
329                                        IEEE80211_QUEUE_STOP_REASON_DRIVER,
330                                        false);
331 }
332 EXPORT_SYMBOL(ieee80211_wake_queue);
333 
334 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
335                                    enum queue_stop_reason reason,
336                                    bool refcounted)
337 {
338         struct ieee80211_local *local = hw_to_local(hw);
339         struct ieee80211_sub_if_data *sdata;
340         int n_acs = IEEE80211_NUM_ACS;
341 
342         trace_stop_queue(local, queue, reason);
343 
344         if (WARN_ON(queue >= hw->queues))
345                 return;
346 
347         if (!refcounted)
348                 local->q_stop_reasons[queue][reason] = 1;
349         else
350                 local->q_stop_reasons[queue][reason]++;
351 
352         if (__test_and_set_bit(reason, &local->queue_stop_reasons[queue]))
353                 return;
354 
355         if (local->hw.queues < IEEE80211_NUM_ACS)
356                 n_acs = 1;
357 
358         rcu_read_lock();
359         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
360                 int ac;
361 
362                 if (!sdata->dev)
363                         continue;
364 
365                 for (ac = 0; ac < n_acs; ac++) {
366                         if (sdata->vif.hw_queue[ac] == queue ||
367                             sdata->vif.cab_queue == queue)
368                                 netif_stop_subqueue(sdata->dev, ac);
369                 }
370         }
371         rcu_read_unlock();
372 }
373 
374 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
375                                     enum queue_stop_reason reason,
376                                     bool refcounted)
377 {
378         struct ieee80211_local *local = hw_to_local(hw);
379         unsigned long flags;
380 
381         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
382         __ieee80211_stop_queue(hw, queue, reason, refcounted);
383         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
384 }
385 
386 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
387 {
388         ieee80211_stop_queue_by_reason(hw, queue,
389                                        IEEE80211_QUEUE_STOP_REASON_DRIVER,
390                                        false);
391 }
392 EXPORT_SYMBOL(ieee80211_stop_queue);
393 
394 void ieee80211_add_pending_skb(struct ieee80211_local *local,
395                                struct sk_buff *skb)
396 {
397         struct ieee80211_hw *hw = &local->hw;
398         unsigned long flags;
399         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
400         int queue = info->hw_queue;
401 
402         if (WARN_ON(!info->control.vif)) {
403                 ieee80211_free_txskb(&local->hw, skb);
404                 return;
405         }
406 
407         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
408         __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD,
409                                false);
410         __skb_queue_tail(&local->pending[queue], skb);
411         __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD,
412                                false);
413         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
414 }
415 
416 void ieee80211_add_pending_skbs(struct ieee80211_local *local,
417                                 struct sk_buff_head *skbs)
418 {
419         struct ieee80211_hw *hw = &local->hw;
420         struct sk_buff *skb;
421         unsigned long flags;
422         int queue, i;
423 
424         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
425         while ((skb = skb_dequeue(skbs))) {
426                 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
427 
428                 if (WARN_ON(!info->control.vif)) {
429                         ieee80211_free_txskb(&local->hw, skb);
430                         continue;
431                 }
432 
433                 queue = info->hw_queue;
434 
435                 __ieee80211_stop_queue(hw, queue,
436                                 IEEE80211_QUEUE_STOP_REASON_SKB_ADD,
437                                 false);
438 
439                 __skb_queue_tail(&local->pending[queue], skb);
440         }
441 
442         for (i = 0; i < hw->queues; i++)
443                 __ieee80211_wake_queue(hw, i,
444                         IEEE80211_QUEUE_STOP_REASON_SKB_ADD,
445                         false);
446         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
447 }
448 
449 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
450                                      unsigned long queues,
451                                      enum queue_stop_reason reason,
452                                      bool refcounted)
453 {
454         struct ieee80211_local *local = hw_to_local(hw);
455         unsigned long flags;
456         int i;
457 
458         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
459 
460         for_each_set_bit(i, &queues, hw->queues)
461                 __ieee80211_stop_queue(hw, i, reason, refcounted);
462 
463         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
464 }
465 
466 void ieee80211_stop_queues(struct ieee80211_hw *hw)
467 {
468         ieee80211_stop_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
469                                         IEEE80211_QUEUE_STOP_REASON_DRIVER,
470                                         false);
471 }
472 EXPORT_SYMBOL(ieee80211_stop_queues);
473 
474 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
475 {
476         struct ieee80211_local *local = hw_to_local(hw);
477         unsigned long flags;
478         int ret;
479 
480         if (WARN_ON(queue >= hw->queues))
481                 return true;
482 
483         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
484         ret = test_bit(IEEE80211_QUEUE_STOP_REASON_DRIVER,
485                        &local->queue_stop_reasons[queue]);
486         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
487         return ret;
488 }
489 EXPORT_SYMBOL(ieee80211_queue_stopped);
490 
491 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
492                                      unsigned long queues,
493                                      enum queue_stop_reason reason,
494                                      bool refcounted)
495 {
496         struct ieee80211_local *local = hw_to_local(hw);
497         unsigned long flags;
498         int i;
499 
500         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
501 
502         for_each_set_bit(i, &queues, hw->queues)
503                 __ieee80211_wake_queue(hw, i, reason, refcounted);
504 
505         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
506 }
507 
508 void ieee80211_wake_queues(struct ieee80211_hw *hw)
509 {
510         ieee80211_wake_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
511                                         IEEE80211_QUEUE_STOP_REASON_DRIVER,
512                                         false);
513 }
514 EXPORT_SYMBOL(ieee80211_wake_queues);
515 
516 static unsigned int
517 ieee80211_get_vif_queues(struct ieee80211_local *local,
518                          struct ieee80211_sub_if_data *sdata)
519 {
520         unsigned int queues;
521 
522         if (sdata && ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
523                 int ac;
524 
525                 queues = 0;
526 
527                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
528                         queues |= BIT(sdata->vif.hw_queue[ac]);
529                 if (sdata->vif.cab_queue != IEEE80211_INVAL_HW_QUEUE)
530                         queues |= BIT(sdata->vif.cab_queue);
531         } else {
532                 /* all queues */
533                 queues = BIT(local->hw.queues) - 1;
534         }
535 
536         return queues;
537 }
538 
539 void __ieee80211_flush_queues(struct ieee80211_local *local,
540                               struct ieee80211_sub_if_data *sdata,
541                               unsigned int queues, bool drop)
542 {
543         if (!local->ops->flush)
544                 return;
545 
546         /*
547          * If no queue was set, or if the HW doesn't support
548          * IEEE80211_HW_QUEUE_CONTROL - flush all queues
549          */
550         if (!queues || !ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
551                 queues = ieee80211_get_vif_queues(local, sdata);
552 
553         ieee80211_stop_queues_by_reason(&local->hw, queues,
554                                         IEEE80211_QUEUE_STOP_REASON_FLUSH,
555                                         false);
556 
557         drv_flush(local, sdata, queues, drop);
558 
559         ieee80211_wake_queues_by_reason(&local->hw, queues,
560                                         IEEE80211_QUEUE_STOP_REASON_FLUSH,
561                                         false);
562 }
563 
564 void ieee80211_flush_queues(struct ieee80211_local *local,
565                             struct ieee80211_sub_if_data *sdata, bool drop)
566 {
567         __ieee80211_flush_queues(local, sdata, 0, drop);
568 }
569 
570 void ieee80211_stop_vif_queues(struct ieee80211_local *local,
571                                struct ieee80211_sub_if_data *sdata,
572                                enum queue_stop_reason reason)
573 {
574         ieee80211_stop_queues_by_reason(&local->hw,
575                                         ieee80211_get_vif_queues(local, sdata),
576                                         reason, true);
577 }
578 
579 void ieee80211_wake_vif_queues(struct ieee80211_local *local,
580                                struct ieee80211_sub_if_data *sdata,
581                                enum queue_stop_reason reason)
582 {
583         ieee80211_wake_queues_by_reason(&local->hw,
584                                         ieee80211_get_vif_queues(local, sdata),
585                                         reason, true);
586 }
587 
588 static void __iterate_interfaces(struct ieee80211_local *local,
589                                  u32 iter_flags,
590                                  void (*iterator)(void *data, u8 *mac,
591                                                   struct ieee80211_vif *vif),
592                                  void *data)
593 {
594         struct ieee80211_sub_if_data *sdata;
595         bool active_only = iter_flags & IEEE80211_IFACE_ITER_ACTIVE;
596 
597         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
598                 switch (sdata->vif.type) {
599                 case NL80211_IFTYPE_MONITOR:
600                         if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
601                                 continue;
602                         break;
603                 case NL80211_IFTYPE_AP_VLAN:
604                         continue;
605                 default:
606                         break;
607                 }
608                 if (!(iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL) &&
609                     active_only && !(sdata->flags & IEEE80211_SDATA_IN_DRIVER))
610                         continue;
611                 if (ieee80211_sdata_running(sdata) || !active_only)
612                         iterator(data, sdata->vif.addr,
613                                  &sdata->vif);
614         }
615 
616         sdata = rcu_dereference_check(local->monitor_sdata,
617                                       lockdep_is_held(&local->iflist_mtx) ||
618                                       lockdep_rtnl_is_held());
619         if (sdata &&
620             (iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL || !active_only ||
621              sdata->flags & IEEE80211_SDATA_IN_DRIVER))
622                 iterator(data, sdata->vif.addr, &sdata->vif);
623 }
624 
625 void ieee80211_iterate_interfaces(
626         struct ieee80211_hw *hw, u32 iter_flags,
627         void (*iterator)(void *data, u8 *mac,
628                          struct ieee80211_vif *vif),
629         void *data)
630 {
631         struct ieee80211_local *local = hw_to_local(hw);
632 
633         mutex_lock(&local->iflist_mtx);
634         __iterate_interfaces(local, iter_flags, iterator, data);
635         mutex_unlock(&local->iflist_mtx);
636 }
637 EXPORT_SYMBOL_GPL(ieee80211_iterate_interfaces);
638 
639 void ieee80211_iterate_active_interfaces_atomic(
640         struct ieee80211_hw *hw, u32 iter_flags,
641         void (*iterator)(void *data, u8 *mac,
642                          struct ieee80211_vif *vif),
643         void *data)
644 {
645         struct ieee80211_local *local = hw_to_local(hw);
646 
647         rcu_read_lock();
648         __iterate_interfaces(local, iter_flags | IEEE80211_IFACE_ITER_ACTIVE,
649                              iterator, data);
650         rcu_read_unlock();
651 }
652 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
653 
654 void ieee80211_iterate_active_interfaces_rtnl(
655         struct ieee80211_hw *hw, u32 iter_flags,
656         void (*iterator)(void *data, u8 *mac,
657                          struct ieee80211_vif *vif),
658         void *data)
659 {
660         struct ieee80211_local *local = hw_to_local(hw);
661 
662         ASSERT_RTNL();
663 
664         __iterate_interfaces(local, iter_flags | IEEE80211_IFACE_ITER_ACTIVE,
665                              iterator, data);
666 }
667 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_rtnl);
668 
669 static void __iterate_stations(struct ieee80211_local *local,
670                                void (*iterator)(void *data,
671                                                 struct ieee80211_sta *sta),
672                                void *data)
673 {
674         struct sta_info *sta;
675 
676         list_for_each_entry_rcu(sta, &local->sta_list, list) {
677                 if (!sta->uploaded)
678                         continue;
679 
680                 iterator(data, &sta->sta);
681         }
682 }
683 
684 void ieee80211_iterate_stations_atomic(struct ieee80211_hw *hw,
685                         void (*iterator)(void *data,
686                                          struct ieee80211_sta *sta),
687                         void *data)
688 {
689         struct ieee80211_local *local = hw_to_local(hw);
690 
691         rcu_read_lock();
692         __iterate_stations(local, iterator, data);
693         rcu_read_unlock();
694 }
695 EXPORT_SYMBOL_GPL(ieee80211_iterate_stations_atomic);
696 
697 struct ieee80211_vif *wdev_to_ieee80211_vif(struct wireless_dev *wdev)
698 {
699         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
700 
701         if (!ieee80211_sdata_running(sdata) ||
702             !(sdata->flags & IEEE80211_SDATA_IN_DRIVER))
703                 return NULL;
704         return &sdata->vif;
705 }
706 EXPORT_SYMBOL_GPL(wdev_to_ieee80211_vif);
707 
708 struct wireless_dev *ieee80211_vif_to_wdev(struct ieee80211_vif *vif)
709 {
710         struct ieee80211_sub_if_data *sdata;
711 
712         if (!vif)
713                 return NULL;
714 
715         sdata = vif_to_sdata(vif);
716 
717         if (!ieee80211_sdata_running(sdata) ||
718             !(sdata->flags & IEEE80211_SDATA_IN_DRIVER))
719                 return NULL;
720 
721         return &sdata->wdev;
722 }
723 EXPORT_SYMBOL_GPL(ieee80211_vif_to_wdev);
724 
725 /*
726  * Nothing should have been stuffed into the workqueue during
727  * the suspend->resume cycle. Since we can't check each caller
728  * of this function if we are already quiescing / suspended,
729  * check here and don't WARN since this can actually happen when
730  * the rx path (for example) is racing against __ieee80211_suspend
731  * and suspending / quiescing was set after the rx path checked
732  * them.
733  */
734 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
735 {
736         if (local->quiescing || (local->suspended && !local->resuming)) {
737                 pr_warn("queueing ieee80211 work while going to suspend\n");
738                 return false;
739         }
740 
741         return true;
742 }
743 
744 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
745 {
746         struct ieee80211_local *local = hw_to_local(hw);
747 
748         if (!ieee80211_can_queue_work(local))
749                 return;
750 
751         queue_work(local->workqueue, work);
752 }
753 EXPORT_SYMBOL(ieee80211_queue_work);
754 
755 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
756                                   struct delayed_work *dwork,
757                                   unsigned long delay)
758 {
759         struct ieee80211_local *local = hw_to_local(hw);
760 
761         if (!ieee80211_can_queue_work(local))
762                 return;
763 
764         queue_delayed_work(local->workqueue, dwork, delay);
765 }
766 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
767 
768 u32 ieee802_11_parse_elems_crc(const u8 *start, size_t len, bool action,
769                                struct ieee802_11_elems *elems,
770                                u64 filter, u32 crc)
771 {
772         size_t left = len;
773         const u8 *pos = start;
774         bool calc_crc = filter != 0;
775         DECLARE_BITMAP(seen_elems, 256);
776         const u8 *ie;
777 
778         bitmap_zero(seen_elems, 256);
779         memset(elems, 0, sizeof(*elems));
780         elems->ie_start = start;
781         elems->total_len = len;
782 
783         while (left >= 2) {
784                 u8 id, elen;
785                 bool elem_parse_failed;
786 
787                 id = *pos++;
788                 elen = *pos++;
789                 left -= 2;
790 
791                 if (elen > left) {
792                         elems->parse_error = true;
793                         break;
794                 }
795 
796                 switch (id) {
797                 case WLAN_EID_SSID:
798                 case WLAN_EID_SUPP_RATES:
799                 case WLAN_EID_FH_PARAMS:
800                 case WLAN_EID_DS_PARAMS:
801                 case WLAN_EID_CF_PARAMS:
802                 case WLAN_EID_TIM:
803                 case WLAN_EID_IBSS_PARAMS:
804                 case WLAN_EID_CHALLENGE:
805                 case WLAN_EID_RSN:
806                 case WLAN_EID_ERP_INFO:
807                 case WLAN_EID_EXT_SUPP_RATES:
808                 case WLAN_EID_HT_CAPABILITY:
809                 case WLAN_EID_HT_OPERATION:
810                 case WLAN_EID_VHT_CAPABILITY:
811                 case WLAN_EID_VHT_OPERATION:
812                 case WLAN_EID_MESH_ID:
813                 case WLAN_EID_MESH_CONFIG:
814                 case WLAN_EID_PEER_MGMT:
815                 case WLAN_EID_PREQ:
816                 case WLAN_EID_PREP:
817                 case WLAN_EID_PERR:
818                 case WLAN_EID_RANN:
819                 case WLAN_EID_CHANNEL_SWITCH:
820                 case WLAN_EID_EXT_CHANSWITCH_ANN:
821                 case WLAN_EID_COUNTRY:
822                 case WLAN_EID_PWR_CONSTRAINT:
823                 case WLAN_EID_TIMEOUT_INTERVAL:
824                 case WLAN_EID_SECONDARY_CHANNEL_OFFSET:
825                 case WLAN_EID_WIDE_BW_CHANNEL_SWITCH:
826                 case WLAN_EID_CHAN_SWITCH_PARAM:
827                 case WLAN_EID_EXT_CAPABILITY:
828                 case WLAN_EID_CHAN_SWITCH_TIMING:
829                 case WLAN_EID_LINK_ID:
830                 /*
831                  * not listing WLAN_EID_CHANNEL_SWITCH_WRAPPER -- it seems possible
832                  * that if the content gets bigger it might be needed more than once
833                  */
834                         if (test_bit(id, seen_elems)) {
835                                 elems->parse_error = true;
836                                 left -= elen;
837                                 pos += elen;
838                                 continue;
839                         }
840                         break;
841                 }
842 
843                 if (calc_crc && id < 64 && (filter & (1ULL << id)))
844                         crc = crc32_be(crc, pos - 2, elen + 2);
845 
846                 elem_parse_failed = false;
847 
848                 switch (id) {
849                 case WLAN_EID_LINK_ID:
850                         if (elen + 2 != sizeof(struct ieee80211_tdls_lnkie)) {
851                                 elem_parse_failed = true;
852                                 break;
853                         }
854                         elems->lnk_id = (void *)(pos - 2);
855                         break;
856                 case WLAN_EID_CHAN_SWITCH_TIMING:
857                         if (elen != sizeof(struct ieee80211_ch_switch_timing)) {
858                                 elem_parse_failed = true;
859                                 break;
860                         }
861                         elems->ch_sw_timing = (void *)pos;
862                         break;
863                 case WLAN_EID_EXT_CAPABILITY:
864                         elems->ext_capab = pos;
865                         elems->ext_capab_len = elen;
866                         break;
867                 case WLAN_EID_SSID:
868                         elems->ssid = pos;
869                         elems->ssid_len = elen;
870                         break;
871                 case WLAN_EID_SUPP_RATES:
872                         elems->supp_rates = pos;
873                         elems->supp_rates_len = elen;
874                         break;
875                 case WLAN_EID_DS_PARAMS:
876                         if (elen >= 1)
877                                 elems->ds_params = pos;
878                         else
879                                 elem_parse_failed = true;
880                         break;
881                 case WLAN_EID_TIM:
882                         if (elen >= sizeof(struct ieee80211_tim_ie)) {
883                                 elems->tim = (void *)pos;
884                                 elems->tim_len = elen;
885                         } else
886                                 elem_parse_failed = true;
887                         break;
888                 case WLAN_EID_CHALLENGE:
889                         elems->challenge = pos;
890                         elems->challenge_len = elen;
891                         break;
892                 case WLAN_EID_VENDOR_SPECIFIC:
893                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
894                             pos[2] == 0xf2) {
895                                 /* Microsoft OUI (00:50:F2) */
896 
897                                 if (calc_crc)
898                                         crc = crc32_be(crc, pos - 2, elen + 2);
899 
900                                 if (elen >= 5 && pos[3] == 2) {
901                                         /* OUI Type 2 - WMM IE */
902                                         if (pos[4] == 0) {
903                                                 elems->wmm_info = pos;
904                                                 elems->wmm_info_len = elen;
905                                         } else if (pos[4] == 1) {
906                                                 elems->wmm_param = pos;
907                                                 elems->wmm_param_len = elen;
908                                         }
909                                 }
910                         }
911                         break;
912                 case WLAN_EID_RSN:
913                         elems->rsn = pos;
914                         elems->rsn_len = elen;
915                         break;
916                 case WLAN_EID_ERP_INFO:
917                         if (elen >= 1)
918                                 elems->erp_info = pos;
919                         else
920                                 elem_parse_failed = true;
921                         break;
922                 case WLAN_EID_EXT_SUPP_RATES:
923                         elems->ext_supp_rates = pos;
924                         elems->ext_supp_rates_len = elen;
925                         break;
926                 case WLAN_EID_HT_CAPABILITY:
927                         if (elen >= sizeof(struct ieee80211_ht_cap))
928                                 elems->ht_cap_elem = (void *)pos;
929                         else
930                                 elem_parse_failed = true;
931                         break;
932                 case WLAN_EID_HT_OPERATION:
933                         if (elen >= sizeof(struct ieee80211_ht_operation))
934                                 elems->ht_operation = (void *)pos;
935                         else
936                                 elem_parse_failed = true;
937                         break;
938                 case WLAN_EID_VHT_CAPABILITY:
939                         if (elen >= sizeof(struct ieee80211_vht_cap))
940                                 elems->vht_cap_elem = (void *)pos;
941                         else
942                                 elem_parse_failed = true;
943                         break;
944                 case WLAN_EID_VHT_OPERATION:
945                         if (elen >= sizeof(struct ieee80211_vht_operation))
946                                 elems->vht_operation = (void *)pos;
947                         else
948                                 elem_parse_failed = true;
949                         break;
950                 case WLAN_EID_OPMODE_NOTIF:
951                         if (elen > 0)
952                                 elems->opmode_notif = pos;
953                         else
954                                 elem_parse_failed = true;
955                         break;
956                 case WLAN_EID_MESH_ID:
957                         elems->mesh_id = pos;
958                         elems->mesh_id_len = elen;
959                         break;
960                 case WLAN_EID_MESH_CONFIG:
961                         if (elen >= sizeof(struct ieee80211_meshconf_ie))
962                                 elems->mesh_config = (void *)pos;
963                         else
964                                 elem_parse_failed = true;
965                         break;
966                 case WLAN_EID_PEER_MGMT:
967                         elems->peering = pos;
968                         elems->peering_len = elen;
969                         break;
970                 case WLAN_EID_MESH_AWAKE_WINDOW:
971                         if (elen >= 2)
972                                 elems->awake_window = (void *)pos;
973                         break;
974                 case WLAN_EID_PREQ:
975                         elems->preq = pos;
976                         elems->preq_len = elen;
977                         break;
978                 case WLAN_EID_PREP:
979                         elems->prep = pos;
980                         elems->prep_len = elen;
981                         break;
982                 case WLAN_EID_PERR:
983                         elems->perr = pos;
984                         elems->perr_len = elen;
985                         break;
986                 case WLAN_EID_RANN:
987                         if (elen >= sizeof(struct ieee80211_rann_ie))
988                                 elems->rann = (void *)pos;
989                         else
990                                 elem_parse_failed = true;
991                         break;
992                 case WLAN_EID_CHANNEL_SWITCH:
993                         if (elen != sizeof(struct ieee80211_channel_sw_ie)) {
994                                 elem_parse_failed = true;
995                                 break;
996                         }
997                         elems->ch_switch_ie = (void *)pos;
998                         break;
999                 case WLAN_EID_EXT_CHANSWITCH_ANN:
1000                         if (elen != sizeof(struct ieee80211_ext_chansw_ie)) {
1001                                 elem_parse_failed = true;
1002                                 break;
1003                         }
1004                         elems->ext_chansw_ie = (void *)pos;
1005                         break;
1006                 case WLAN_EID_SECONDARY_CHANNEL_OFFSET:
1007                         if (elen != sizeof(struct ieee80211_sec_chan_offs_ie)) {
1008                                 elem_parse_failed = true;
1009                                 break;
1010                         }
1011                         elems->sec_chan_offs = (void *)pos;
1012                         break;
1013                 case WLAN_EID_CHAN_SWITCH_PARAM:
1014                         if (elen !=
1015                             sizeof(*elems->mesh_chansw_params_ie)) {
1016                                 elem_parse_failed = true;
1017                                 break;
1018                         }
1019                         elems->mesh_chansw_params_ie = (void *)pos;
1020                         break;
1021                 case WLAN_EID_WIDE_BW_CHANNEL_SWITCH:
1022                         if (!action ||
1023                             elen != sizeof(*elems->wide_bw_chansw_ie)) {
1024                                 elem_parse_failed = true;
1025                                 break;
1026                         }
1027                         elems->wide_bw_chansw_ie = (void *)pos;
1028                         break;
1029                 case WLAN_EID_CHANNEL_SWITCH_WRAPPER:
1030                         if (action) {
1031                                 elem_parse_failed = true;
1032                                 break;
1033                         }
1034                         /*
1035                          * This is a bit tricky, but as we only care about
1036                          * the wide bandwidth channel switch element, so
1037                          * just parse it out manually.
1038                          */
1039                         ie = cfg80211_find_ie(WLAN_EID_WIDE_BW_CHANNEL_SWITCH,
1040                                               pos, elen);
1041                         if (ie) {
1042                                 if (ie[1] == sizeof(*elems->wide_bw_chansw_ie))
1043                                         elems->wide_bw_chansw_ie =
1044                                                 (void *)(ie + 2);
1045                                 else
1046                                         elem_parse_failed = true;
1047                         }
1048                         break;
1049                 case WLAN_EID_COUNTRY:
1050                         elems->country_elem = pos;
1051                         elems->country_elem_len = elen;
1052                         break;
1053                 case WLAN_EID_PWR_CONSTRAINT:
1054                         if (elen != 1) {
1055                                 elem_parse_failed = true;
1056                                 break;
1057                         }
1058                         elems->pwr_constr_elem = pos;
1059                         break;
1060                 case WLAN_EID_CISCO_VENDOR_SPECIFIC:
1061                         /* Lots of different options exist, but we only care
1062                          * about the Dynamic Transmit Power Control element.
1063                          * First check for the Cisco OUI, then for the DTPC
1064                          * tag (0x00).
1065                          */
1066                         if (elen < 4) {
1067                                 elem_parse_failed = true;
1068                                 break;
1069                         }
1070 
1071                         if (pos[0] != 0x00 || pos[1] != 0x40 ||
1072                             pos[2] != 0x96 || pos[3] != 0x00)
1073                                 break;
1074 
1075                         if (elen != 6) {
1076                                 elem_parse_failed = true;
1077                                 break;
1078                         }
1079 
1080                         if (calc_crc)
1081                                 crc = crc32_be(crc, pos - 2, elen + 2);
1082 
1083                         elems->cisco_dtpc_elem = pos;
1084                         break;
1085                 case WLAN_EID_TIMEOUT_INTERVAL:
1086                         if (elen >= sizeof(struct ieee80211_timeout_interval_ie))
1087                                 elems->timeout_int = (void *)pos;
1088                         else
1089                                 elem_parse_failed = true;
1090                         break;
1091                 default:
1092                         break;
1093                 }
1094 
1095                 if (elem_parse_failed)
1096                         elems->parse_error = true;
1097                 else
1098                         __set_bit(id, seen_elems);
1099 
1100                 left -= elen;
1101                 pos += elen;
1102         }
1103 
1104         if (left != 0)
1105                 elems->parse_error = true;
1106 
1107         return crc;
1108 }
1109 
1110 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata,
1111                                bool bss_notify, bool enable_qos)
1112 {
1113         struct ieee80211_local *local = sdata->local;
1114         struct ieee80211_tx_queue_params qparam;
1115         struct ieee80211_chanctx_conf *chanctx_conf;
1116         int ac;
1117         bool use_11b;
1118         bool is_ocb; /* Use another EDCA parameters if dot11OCBActivated=true */
1119         int aCWmin, aCWmax;
1120 
1121         if (!local->ops->conf_tx)
1122                 return;
1123 
1124         if (local->hw.queues < IEEE80211_NUM_ACS)
1125                 return;
1126 
1127         memset(&qparam, 0, sizeof(qparam));
1128 
1129         rcu_read_lock();
1130         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1131         use_11b = (chanctx_conf &&
1132                    chanctx_conf->def.chan->band == IEEE80211_BAND_2GHZ) &&
1133                  !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
1134         rcu_read_unlock();
1135 
1136         is_ocb = (sdata->vif.type == NL80211_IFTYPE_OCB);
1137 
1138         /* Set defaults according to 802.11-2007 Table 7-37 */
1139         aCWmax = 1023;
1140         if (use_11b)
1141                 aCWmin = 31;
1142         else
1143                 aCWmin = 15;
1144 
1145         /* Confiure old 802.11b/g medium access rules. */
1146         qparam.cw_max = aCWmax;
1147         qparam.cw_min = aCWmin;
1148         qparam.txop = 0;
1149         qparam.aifs = 2;
1150 
1151         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1152                 /* Update if QoS is enabled. */
1153                 if (enable_qos) {
1154                         switch (ac) {
1155                         case IEEE80211_AC_BK:
1156                                 qparam.cw_max = aCWmax;
1157                                 qparam.cw_min = aCWmin;
1158                                 qparam.txop = 0;
1159                                 if (is_ocb)
1160                                         qparam.aifs = 9;
1161                                 else
1162                                         qparam.aifs = 7;
1163                                 break;
1164                         /* never happens but let's not leave undefined */
1165                         default:
1166                         case IEEE80211_AC_BE:
1167                                 qparam.cw_max = aCWmax;
1168                                 qparam.cw_min = aCWmin;
1169                                 qparam.txop = 0;
1170                                 if (is_ocb)
1171                                         qparam.aifs = 6;
1172                                 else
1173                                         qparam.aifs = 3;
1174                                 break;
1175                         case IEEE80211_AC_VI:
1176                                 qparam.cw_max = aCWmin;
1177                                 qparam.cw_min = (aCWmin + 1) / 2 - 1;
1178                                 if (is_ocb)
1179                                         qparam.txop = 0;
1180                                 else if (use_11b)
1181                                         qparam.txop = 6016/32;
1182                                 else
1183                                         qparam.txop = 3008/32;
1184 
1185                                 if (is_ocb)
1186                                         qparam.aifs = 3;
1187                                 else
1188                                         qparam.aifs = 2;
1189                                 break;
1190                         case IEEE80211_AC_VO:
1191                                 qparam.cw_max = (aCWmin + 1) / 2 - 1;
1192                                 qparam.cw_min = (aCWmin + 1) / 4 - 1;
1193                                 if (is_ocb)
1194                                         qparam.txop = 0;
1195                                 else if (use_11b)
1196                                         qparam.txop = 3264/32;
1197                                 else
1198                                         qparam.txop = 1504/32;
1199                                 qparam.aifs = 2;
1200                                 break;
1201                         }
1202                 }
1203 
1204                 qparam.uapsd = false;
1205 
1206                 sdata->tx_conf[ac] = qparam;
1207                 drv_conf_tx(local, sdata, ac, &qparam);
1208         }
1209 
1210         if (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1211             sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
1212                 sdata->vif.bss_conf.qos = enable_qos;
1213                 if (bss_notify)
1214                         ieee80211_bss_info_change_notify(sdata,
1215                                                          BSS_CHANGED_QOS);
1216         }
1217 }
1218 
1219 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
1220                          u16 transaction, u16 auth_alg, u16 status,
1221                          const u8 *extra, size_t extra_len, const u8 *da,
1222                          const u8 *bssid, const u8 *key, u8 key_len, u8 key_idx,
1223                          u32 tx_flags)
1224 {
1225         struct ieee80211_local *local = sdata->local;
1226         struct sk_buff *skb;
1227         struct ieee80211_mgmt *mgmt;
1228         int err;
1229 
1230         /* 24 + 6 = header + auth_algo + auth_transaction + status_code */
1231         skb = dev_alloc_skb(local->hw.extra_tx_headroom + IEEE80211_WEP_IV_LEN +
1232                             24 + 6 + extra_len + IEEE80211_WEP_ICV_LEN);
1233         if (!skb)
1234                 return;
1235 
1236         skb_reserve(skb, local->hw.extra_tx_headroom + IEEE80211_WEP_IV_LEN);
1237 
1238         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
1239         memset(mgmt, 0, 24 + 6);
1240         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1241                                           IEEE80211_STYPE_AUTH);
1242         memcpy(mgmt->da, da, ETH_ALEN);
1243         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1244         memcpy(mgmt->bssid, bssid, ETH_ALEN);
1245         mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
1246         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
1247         mgmt->u.auth.status_code = cpu_to_le16(status);
1248         if (extra)
1249                 memcpy(skb_put(skb, extra_len), extra, extra_len);
1250 
1251         if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
1252                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
1253                 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
1254                 WARN_ON(err);
1255         }
1256 
1257         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1258                                         tx_flags;
1259         ieee80211_tx_skb(sdata, skb);
1260 }
1261 
1262 void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
1263                                     const u8 *bssid, u16 stype, u16 reason,
1264                                     bool send_frame, u8 *frame_buf)
1265 {
1266         struct ieee80211_local *local = sdata->local;
1267         struct sk_buff *skb;
1268         struct ieee80211_mgmt *mgmt = (void *)frame_buf;
1269 
1270         /* build frame */
1271         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
1272         mgmt->duration = 0; /* initialize only */
1273         mgmt->seq_ctrl = 0; /* initialize only */
1274         memcpy(mgmt->da, bssid, ETH_ALEN);
1275         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1276         memcpy(mgmt->bssid, bssid, ETH_ALEN);
1277         /* u.deauth.reason_code == u.disassoc.reason_code */
1278         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
1279 
1280         if (send_frame) {
1281                 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
1282                                     IEEE80211_DEAUTH_FRAME_LEN);
1283                 if (!skb)
1284                         return;
1285 
1286                 skb_reserve(skb, local->hw.extra_tx_headroom);
1287 
1288                 /* copy in frame */
1289                 memcpy(skb_put(skb, IEEE80211_DEAUTH_FRAME_LEN),
1290                        mgmt, IEEE80211_DEAUTH_FRAME_LEN);
1291 
1292                 if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1293                     !(sdata->u.mgd.flags & IEEE80211_STA_MFP_ENABLED))
1294                         IEEE80211_SKB_CB(skb)->flags |=
1295                                 IEEE80211_TX_INTFL_DONT_ENCRYPT;
1296 
1297                 ieee80211_tx_skb(sdata, skb);
1298         }
1299 }
1300 
1301 static int ieee80211_build_preq_ies_band(struct ieee80211_local *local,
1302                                          u8 *buffer, size_t buffer_len,
1303                                          const u8 *ie, size_t ie_len,
1304                                          enum ieee80211_band band,
1305                                          u32 rate_mask,
1306                                          struct cfg80211_chan_def *chandef,
1307                                          size_t *offset)
1308 {
1309         struct ieee80211_supported_band *sband;
1310         u8 *pos = buffer, *end = buffer + buffer_len;
1311         size_t noffset;
1312         int supp_rates_len, i;
1313         u8 rates[32];
1314         int num_rates;
1315         int ext_rates_len;
1316         int shift;
1317         u32 rate_flags;
1318         bool have_80mhz = false;
1319 
1320         *offset = 0;
1321 
1322         sband = local->hw.wiphy->bands[band];
1323         if (WARN_ON_ONCE(!sband))
1324                 return 0;
1325 
1326         rate_flags = ieee80211_chandef_rate_flags(chandef);
1327         shift = ieee80211_chandef_get_shift(chandef);
1328 
1329         num_rates = 0;
1330         for (i = 0; i < sband->n_bitrates; i++) {
1331                 if ((BIT(i) & rate_mask) == 0)
1332                         continue; /* skip rate */
1333                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1334                         continue;
1335 
1336                 rates[num_rates++] =
1337                         (u8) DIV_ROUND_UP(sband->bitrates[i].bitrate,
1338                                           (1 << shift) * 5);
1339         }
1340 
1341         supp_rates_len = min_t(int, num_rates, 8);
1342 
1343         if (end - pos < 2 + supp_rates_len)
1344                 goto out_err;
1345         *pos++ = WLAN_EID_SUPP_RATES;
1346         *pos++ = supp_rates_len;
1347         memcpy(pos, rates, supp_rates_len);
1348         pos += supp_rates_len;
1349 
1350         /* insert "request information" if in custom IEs */
1351         if (ie && ie_len) {
1352                 static const u8 before_extrates[] = {
1353                         WLAN_EID_SSID,
1354                         WLAN_EID_SUPP_RATES,
1355                         WLAN_EID_REQUEST,
1356                 };
1357                 noffset = ieee80211_ie_split(ie, ie_len,
1358                                              before_extrates,
1359                                              ARRAY_SIZE(before_extrates),
1360                                              *offset);
1361                 if (end - pos < noffset - *offset)
1362                         goto out_err;
1363                 memcpy(pos, ie + *offset, noffset - *offset);
1364                 pos += noffset - *offset;
1365                 *offset = noffset;
1366         }
1367 
1368         ext_rates_len = num_rates - supp_rates_len;
1369         if (ext_rates_len > 0) {
1370                 if (end - pos < 2 + ext_rates_len)
1371                         goto out_err;
1372                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1373                 *pos++ = ext_rates_len;
1374                 memcpy(pos, rates + supp_rates_len, ext_rates_len);
1375                 pos += ext_rates_len;
1376         }
1377 
1378         if (chandef->chan && sband->band == IEEE80211_BAND_2GHZ) {
1379                 if (end - pos < 3)
1380                         goto out_err;
1381                 *pos++ = WLAN_EID_DS_PARAMS;
1382                 *pos++ = 1;
1383                 *pos++ = ieee80211_frequency_to_channel(
1384                                 chandef->chan->center_freq);
1385         }
1386 
1387         /* insert custom IEs that go before HT */
1388         if (ie && ie_len) {
1389                 static const u8 before_ht[] = {
1390                         WLAN_EID_SSID,
1391                         WLAN_EID_SUPP_RATES,
1392                         WLAN_EID_REQUEST,
1393                         WLAN_EID_EXT_SUPP_RATES,
1394                         WLAN_EID_DS_PARAMS,
1395                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1396                 };
1397                 noffset = ieee80211_ie_split(ie, ie_len,
1398                                              before_ht, ARRAY_SIZE(before_ht),
1399                                              *offset);
1400                 if (end - pos < noffset - *offset)
1401                         goto out_err;
1402                 memcpy(pos, ie + *offset, noffset - *offset);
1403                 pos += noffset - *offset;
1404                 *offset = noffset;
1405         }
1406 
1407         if (sband->ht_cap.ht_supported) {
1408                 if (end - pos < 2 + sizeof(struct ieee80211_ht_cap))
1409                         goto out_err;
1410                 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
1411                                                 sband->ht_cap.cap);
1412         }
1413 
1414         /*
1415          * If adding more here, adjust code in main.c
1416          * that calculates local->scan_ies_len.
1417          */
1418 
1419         /* insert custom IEs that go before VHT */
1420         if (ie && ie_len) {
1421                 static const u8 before_vht[] = {
1422                         WLAN_EID_SSID,
1423                         WLAN_EID_SUPP_RATES,
1424                         WLAN_EID_REQUEST,
1425                         WLAN_EID_EXT_SUPP_RATES,
1426                         WLAN_EID_DS_PARAMS,
1427                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1428                         WLAN_EID_HT_CAPABILITY,
1429                         WLAN_EID_BSS_COEX_2040,
1430                         WLAN_EID_EXT_CAPABILITY,
1431                         WLAN_EID_SSID_LIST,
1432                         WLAN_EID_CHANNEL_USAGE,
1433                         WLAN_EID_INTERWORKING,
1434                         /* mesh ID can't happen here */
1435                         /* 60 GHz can't happen here right now */
1436                 };
1437                 noffset = ieee80211_ie_split(ie, ie_len,
1438                                              before_vht, ARRAY_SIZE(before_vht),
1439                                              *offset);
1440                 if (end - pos < noffset - *offset)
1441                         goto out_err;
1442                 memcpy(pos, ie + *offset, noffset - *offset);
1443                 pos += noffset - *offset;
1444                 *offset = noffset;
1445         }
1446 
1447         /* Check if any channel in this sband supports at least 80 MHz */
1448         for (i = 0; i < sband->n_channels; i++) {
1449                 if (sband->channels[i].flags & (IEEE80211_CHAN_DISABLED |
1450                                                 IEEE80211_CHAN_NO_80MHZ))
1451                         continue;
1452 
1453                 have_80mhz = true;
1454                 break;
1455         }
1456 
1457         if (sband->vht_cap.vht_supported && have_80mhz) {
1458                 if (end - pos < 2 + sizeof(struct ieee80211_vht_cap))
1459                         goto out_err;
1460                 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
1461                                                  sband->vht_cap.cap);
1462         }
1463 
1464         return pos - buffer;
1465  out_err:
1466         WARN_ONCE(1, "not enough space for preq IEs\n");
1467         return pos - buffer;
1468 }
1469 
1470 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
1471                              size_t buffer_len,
1472                              struct ieee80211_scan_ies *ie_desc,
1473                              const u8 *ie, size_t ie_len,
1474                              u8 bands_used, u32 *rate_masks,
1475                              struct cfg80211_chan_def *chandef)
1476 {
1477         size_t pos = 0, old_pos = 0, custom_ie_offset = 0;
1478         int i;
1479 
1480         memset(ie_desc, 0, sizeof(*ie_desc));
1481 
1482         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1483                 if (bands_used & BIT(i)) {
1484                         pos += ieee80211_build_preq_ies_band(local,
1485                                                              buffer + pos,
1486                                                              buffer_len - pos,
1487                                                              ie, ie_len, i,
1488                                                              rate_masks[i],
1489                                                              chandef,
1490                                                              &custom_ie_offset);
1491                         ie_desc->ies[i] = buffer + old_pos;
1492                         ie_desc->len[i] = pos - old_pos;
1493                         old_pos = pos;
1494                 }
1495         }
1496 
1497         /* add any remaining custom IEs */
1498         if (ie && ie_len) {
1499                 if (WARN_ONCE(buffer_len - pos < ie_len - custom_ie_offset,
1500                               "not enough space for preq custom IEs\n"))
1501                         return pos;
1502                 memcpy(buffer + pos, ie + custom_ie_offset,
1503                        ie_len - custom_ie_offset);
1504                 ie_desc->common_ies = buffer + pos;
1505                 ie_desc->common_ie_len = ie_len - custom_ie_offset;
1506                 pos += ie_len - custom_ie_offset;
1507         }
1508 
1509         return pos;
1510 };
1511 
1512 struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
1513                                           const u8 *src, const u8 *dst,
1514                                           u32 ratemask,
1515                                           struct ieee80211_channel *chan,
1516                                           const u8 *ssid, size_t ssid_len,
1517                                           const u8 *ie, size_t ie_len,
1518                                           bool directed)
1519 {
1520         struct ieee80211_local *local = sdata->local;
1521         struct cfg80211_chan_def chandef;
1522         struct sk_buff *skb;
1523         struct ieee80211_mgmt *mgmt;
1524         int ies_len;
1525         u32 rate_masks[IEEE80211_NUM_BANDS] = {};
1526         struct ieee80211_scan_ies dummy_ie_desc;
1527 
1528         /*
1529          * Do not send DS Channel parameter for directed probe requests
1530          * in order to maximize the chance that we get a response.  Some
1531          * badly-behaved APs don't respond when this parameter is included.
1532          */
1533         chandef.width = sdata->vif.bss_conf.chandef.width;
1534         if (directed)
1535                 chandef.chan = NULL;
1536         else
1537                 chandef.chan = chan;
1538 
1539         skb = ieee80211_probereq_get(&local->hw, src, ssid, ssid_len,
1540                                      100 + ie_len);
1541         if (!skb)
1542                 return NULL;
1543 
1544         rate_masks[chan->band] = ratemask;
1545         ies_len = ieee80211_build_preq_ies(local, skb_tail_pointer(skb),
1546                                            skb_tailroom(skb), &dummy_ie_desc,
1547                                            ie, ie_len, BIT(chan->band),
1548                                            rate_masks, &chandef);
1549         skb_put(skb, ies_len);
1550 
1551         if (dst) {
1552                 mgmt = (struct ieee80211_mgmt *) skb->data;
1553                 memcpy(mgmt->da, dst, ETH_ALEN);
1554                 memcpy(mgmt->bssid, dst, ETH_ALEN);
1555         }
1556 
1557         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1558 
1559         return skb;
1560 }
1561 
1562 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata,
1563                               const u8 *src, const u8 *dst,
1564                               const u8 *ssid, size_t ssid_len,
1565                               const u8 *ie, size_t ie_len,
1566                               u32 ratemask, bool directed, u32 tx_flags,
1567                               struct ieee80211_channel *channel, bool scan)
1568 {
1569         struct sk_buff *skb;
1570 
1571         skb = ieee80211_build_probe_req(sdata, src, dst, ratemask, channel,
1572                                         ssid, ssid_len,
1573                                         ie, ie_len, directed);
1574         if (skb) {
1575                 IEEE80211_SKB_CB(skb)->flags |= tx_flags;
1576                 if (scan)
1577                         ieee80211_tx_skb_tid_band(sdata, skb, 7, channel->band);
1578                 else
1579                         ieee80211_tx_skb(sdata, skb);
1580         }
1581 }
1582 
1583 u32 ieee80211_sta_get_rates(struct ieee80211_sub_if_data *sdata,
1584                             struct ieee802_11_elems *elems,
1585                             enum ieee80211_band band, u32 *basic_rates)
1586 {
1587         struct ieee80211_supported_band *sband;
1588         size_t num_rates;
1589         u32 supp_rates, rate_flags;
1590         int i, j, shift;
1591         sband = sdata->local->hw.wiphy->bands[band];
1592 
1593         rate_flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
1594         shift = ieee80211_vif_get_shift(&sdata->vif);
1595 
1596         if (WARN_ON(!sband))
1597                 return 1;
1598 
1599         num_rates = sband->n_bitrates;
1600         supp_rates = 0;
1601         for (i = 0; i < elems->supp_rates_len +
1602                      elems->ext_supp_rates_len; i++) {
1603                 u8 rate = 0;
1604                 int own_rate;
1605                 bool is_basic;
1606                 if (i < elems->supp_rates_len)
1607                         rate = elems->supp_rates[i];
1608                 else if (elems->ext_supp_rates)
1609                         rate = elems->ext_supp_rates
1610                                 [i - elems->supp_rates_len];
1611                 own_rate = 5 * (rate & 0x7f);
1612                 is_basic = !!(rate & 0x80);
1613 
1614                 if (is_basic && (rate & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1615                         continue;
1616 
1617                 for (j = 0; j < num_rates; j++) {
1618                         int brate;
1619                         if ((rate_flags & sband->bitrates[j].flags)
1620                             != rate_flags)
1621                                 continue;
1622 
1623                         brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
1624                                              1 << shift);
1625 
1626                         if (brate == own_rate) {
1627                                 supp_rates |= BIT(j);
1628                                 if (basic_rates && is_basic)
1629                                         *basic_rates |= BIT(j);
1630                         }
1631                 }
1632         }
1633         return supp_rates;
1634 }
1635 
1636 void ieee80211_stop_device(struct ieee80211_local *local)
1637 {
1638         ieee80211_led_radio(local, false);
1639         ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
1640 
1641         cancel_work_sync(&local->reconfig_filter);
1642 
1643         flush_workqueue(local->workqueue);
1644         drv_stop(local);
1645 }
1646 
1647 static void ieee80211_flush_completed_scan(struct ieee80211_local *local,
1648                                            bool aborted)
1649 {
1650         /* It's possible that we don't handle the scan completion in
1651          * time during suspend, so if it's still marked as completed
1652          * here, queue the work and flush it to clean things up.
1653          * Instead of calling the worker function directly here, we
1654          * really queue it to avoid potential races with other flows
1655          * scheduling the same work.
1656          */
1657         if (test_bit(SCAN_COMPLETED, &local->scanning)) {
1658                 /* If coming from reconfiguration failure, abort the scan so
1659                  * we don't attempt to continue a partial HW scan - which is
1660                  * possible otherwise if (e.g.) the 2.4 GHz portion was the
1661                  * completed scan, and a 5 GHz portion is still pending.
1662                  */
1663                 if (aborted)
1664                         set_bit(SCAN_ABORTED, &local->scanning);
1665                 ieee80211_queue_delayed_work(&local->hw, &local->scan_work, 0);
1666                 flush_delayed_work(&local->scan_work);
1667         }
1668 }
1669 
1670 static void ieee80211_handle_reconfig_failure(struct ieee80211_local *local)
1671 {
1672         struct ieee80211_sub_if_data *sdata;
1673         struct ieee80211_chanctx *ctx;
1674 
1675         /*
1676          * We get here if during resume the device can't be restarted properly.
1677          * We might also get here if this happens during HW reset, which is a
1678          * slightly different situation and we need to drop all connections in
1679          * the latter case.
1680          *
1681          * Ask cfg80211 to turn off all interfaces, this will result in more
1682          * warnings but at least we'll then get into a clean stopped state.
1683          */
1684 
1685         local->resuming = false;
1686         local->suspended = false;
1687         local->in_reconfig = false;
1688 
1689         ieee80211_flush_completed_scan(local, true);
1690 
1691         /* scheduled scan clearly can't be running any more, but tell
1692          * cfg80211 and clear local state
1693          */
1694         ieee80211_sched_scan_end(local);
1695 
1696         list_for_each_entry(sdata, &local->interfaces, list)
1697                 sdata->flags &= ~IEEE80211_SDATA_IN_DRIVER;
1698 
1699         /* Mark channel contexts as not being in the driver any more to avoid
1700          * removing them from the driver during the shutdown process...
1701          */
1702         mutex_lock(&local->chanctx_mtx);
1703         list_for_each_entry(ctx, &local->chanctx_list, list)
1704                 ctx->driver_present = false;
1705         mutex_unlock(&local->chanctx_mtx);
1706 
1707         cfg80211_shutdown_all_interfaces(local->hw.wiphy);
1708 }
1709 
1710 static void ieee80211_assign_chanctx(struct ieee80211_local *local,
1711                                      struct ieee80211_sub_if_data *sdata)
1712 {
1713         struct ieee80211_chanctx_conf *conf;
1714         struct ieee80211_chanctx *ctx;
1715 
1716         if (!local->use_chanctx)
1717                 return;
1718 
1719         mutex_lock(&local->chanctx_mtx);
1720         conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1721                                          lockdep_is_held(&local->chanctx_mtx));
1722         if (conf) {
1723                 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1724                 drv_assign_vif_chanctx(local, sdata, ctx);
1725         }
1726         mutex_unlock(&local->chanctx_mtx);
1727 }
1728 
1729 static void ieee80211_reconfig_stations(struct ieee80211_sub_if_data *sdata)
1730 {
1731         struct ieee80211_local *local = sdata->local;
1732         struct sta_info *sta;
1733 
1734         /* add STAs back */
1735         mutex_lock(&local->sta_mtx);
1736         list_for_each_entry(sta, &local->sta_list, list) {
1737                 enum ieee80211_sta_state state;
1738 
1739                 if (!sta->uploaded || sta->sdata != sdata)
1740                         continue;
1741 
1742                 for (state = IEEE80211_STA_NOTEXIST;
1743                      state < sta->sta_state; state++)
1744                         WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1745                                               state + 1));
1746         }
1747         mutex_unlock(&local->sta_mtx);
1748 }
1749 
1750 int ieee80211_reconfig(struct ieee80211_local *local)
1751 {
1752         struct ieee80211_hw *hw = &local->hw;
1753         struct ieee80211_sub_if_data *sdata;
1754         struct ieee80211_chanctx *ctx;
1755         struct sta_info *sta;
1756         int res, i;
1757         bool reconfig_due_to_wowlan = false;
1758         struct ieee80211_sub_if_data *sched_scan_sdata;
1759         struct cfg80211_sched_scan_request *sched_scan_req;
1760         bool sched_scan_stopped = false;
1761         bool suspended = local->suspended;
1762 
1763         /* nothing to do if HW shouldn't run */
1764         if (!local->open_count)
1765                 goto wake_up;
1766 
1767 #ifdef CONFIG_PM
1768         if (suspended)
1769                 local->resuming = true;
1770 
1771         if (local->wowlan) {
1772                 /*
1773                  * In the wowlan case, both mac80211 and the device
1774                  * are functional when the resume op is called, so
1775                  * clear local->suspended so the device could operate
1776                  * normally (e.g. pass rx frames).
1777                  */
1778                 local->suspended = false;
1779                 res = drv_resume(local);
1780                 local->wowlan = false;
1781                 if (res < 0) {
1782                         local->resuming = false;
1783                         return res;
1784                 }
1785                 if (res == 0)
1786                         goto wake_up;
1787                 WARN_ON(res > 1);
1788                 /*
1789                  * res is 1, which means the driver requested
1790                  * to go through a regular reset on wakeup.
1791                  * restore local->suspended in this case.
1792                  */
1793                 reconfig_due_to_wowlan = true;
1794                 local->suspended = true;
1795         }
1796 #endif
1797 
1798         /*
1799          * In case of hw_restart during suspend (without wowlan),
1800          * cancel restart work, as we are reconfiguring the device
1801          * anyway.
1802          * Note that restart_work is scheduled on a frozen workqueue,
1803          * so we can't deadlock in this case.
1804          */
1805         if (suspended && local->in_reconfig && !reconfig_due_to_wowlan)
1806                 cancel_work_sync(&local->restart_work);
1807 
1808         local->started = false;
1809 
1810         /*
1811          * Upon resume hardware can sometimes be goofy due to
1812          * various platform / driver / bus issues, so restarting
1813          * the device may at times not work immediately. Propagate
1814          * the error.
1815          */
1816         res = drv_start(local);
1817         if (res) {
1818                 if (suspended)
1819                         WARN(1, "Hardware became unavailable upon resume. This could be a software issue prior to suspend or a hardware issue.\n");
1820                 else
1821                         WARN(1, "Hardware became unavailable during restart.\n");
1822                 ieee80211_handle_reconfig_failure(local);
1823                 return res;
1824         }
1825 
1826         /* setup fragmentation threshold */
1827         drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
1828 
1829         /* setup RTS threshold */
1830         drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1831 
1832         /* reset coverage class */
1833         drv_set_coverage_class(local, hw->wiphy->coverage_class);
1834 
1835         ieee80211_led_radio(local, true);
1836         ieee80211_mod_tpt_led_trig(local,
1837                                    IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1838 
1839         /* add interfaces */
1840         sdata = rtnl_dereference(local->monitor_sdata);
1841         if (sdata) {
1842                 /* in HW restart it exists already */
1843                 WARN_ON(local->resuming);
1844                 res = drv_add_interface(local, sdata);
1845                 if (WARN_ON(res)) {
1846                         RCU_INIT_POINTER(local->monitor_sdata, NULL);
1847                         synchronize_net();
1848                         kfree(sdata);
1849                 }
1850         }
1851 
1852         list_for_each_entry(sdata, &local->interfaces, list) {
1853                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1854                     sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1855                     ieee80211_sdata_running(sdata)) {
1856                         res = drv_add_interface(local, sdata);
1857                         if (WARN_ON(res))
1858                                 break;
1859                 }
1860         }
1861 
1862         /* If adding any of the interfaces failed above, roll back and
1863          * report failure.
1864          */
1865         if (res) {
1866                 list_for_each_entry_continue_reverse(sdata, &local->interfaces,
1867                                                      list)
1868                         if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1869                             sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1870                             ieee80211_sdata_running(sdata))
1871                                 drv_remove_interface(local, sdata);
1872                 ieee80211_handle_reconfig_failure(local);
1873                 return res;
1874         }
1875 
1876         /* add channel contexts */
1877         if (local->use_chanctx) {
1878                 mutex_lock(&local->chanctx_mtx);
1879                 list_for_each_entry(ctx, &local->chanctx_list, list)
1880                         if (ctx->replace_state !=
1881                             IEEE80211_CHANCTX_REPLACES_OTHER)
1882                                 WARN_ON(drv_add_chanctx(local, ctx));
1883                 mutex_unlock(&local->chanctx_mtx);
1884 
1885                 sdata = rtnl_dereference(local->monitor_sdata);
1886                 if (sdata && ieee80211_sdata_running(sdata))
1887                         ieee80211_assign_chanctx(local, sdata);
1888         }
1889 
1890         /* reconfigure hardware */
1891         ieee80211_hw_config(local, ~0);
1892 
1893         ieee80211_configure_filter(local);
1894 
1895         /* Finally also reconfigure all the BSS information */
1896         list_for_each_entry(sdata, &local->interfaces, list) {
1897                 u32 changed;
1898 
1899                 if (!ieee80211_sdata_running(sdata))
1900                         continue;
1901 
1902                 ieee80211_assign_chanctx(local, sdata);
1903 
1904                 switch (sdata->vif.type) {
1905                 case NL80211_IFTYPE_AP_VLAN:
1906                 case NL80211_IFTYPE_MONITOR:
1907                         break;
1908                 default:
1909                         ieee80211_reconfig_stations(sdata);
1910                         /* fall through */
1911                 case NL80211_IFTYPE_AP: /* AP stations are handled later */
1912                         for (i = 0; i < IEEE80211_NUM_ACS; i++)
1913                                 drv_conf_tx(local, sdata, i,
1914                                             &sdata->tx_conf[i]);
1915                         break;
1916                 }
1917 
1918                 /* common change flags for all interface types */
1919                 changed = BSS_CHANGED_ERP_CTS_PROT |
1920                           BSS_CHANGED_ERP_PREAMBLE |
1921                           BSS_CHANGED_ERP_SLOT |
1922                           BSS_CHANGED_HT |
1923                           BSS_CHANGED_BASIC_RATES |
1924                           BSS_CHANGED_BEACON_INT |
1925                           BSS_CHANGED_BSSID |
1926                           BSS_CHANGED_CQM |
1927                           BSS_CHANGED_QOS |
1928                           BSS_CHANGED_IDLE |
1929                           BSS_CHANGED_TXPOWER;
1930 
1931                 if (sdata->vif.mu_mimo_owner)
1932                         changed |= BSS_CHANGED_MU_GROUPS;
1933 
1934                 switch (sdata->vif.type) {
1935                 case NL80211_IFTYPE_STATION:
1936                         changed |= BSS_CHANGED_ASSOC |
1937                                    BSS_CHANGED_ARP_FILTER |
1938                                    BSS_CHANGED_PS;
1939 
1940                         /* Re-send beacon info report to the driver */
1941                         if (sdata->u.mgd.have_beacon)
1942                                 changed |= BSS_CHANGED_BEACON_INFO;
1943 
1944                         sdata_lock(sdata);
1945                         ieee80211_bss_info_change_notify(sdata, changed);
1946                         sdata_unlock(sdata);
1947                         break;
1948                 case NL80211_IFTYPE_OCB:
1949                         changed |= BSS_CHANGED_OCB;
1950                         ieee80211_bss_info_change_notify(sdata, changed);
1951                         break;
1952                 case NL80211_IFTYPE_ADHOC:
1953                         changed |= BSS_CHANGED_IBSS;
1954                         /* fall through */
1955                 case NL80211_IFTYPE_AP:
1956                         changed |= BSS_CHANGED_SSID | BSS_CHANGED_P2P_PS;
1957 
1958                         if (sdata->vif.type == NL80211_IFTYPE_AP) {
1959                                 changed |= BSS_CHANGED_AP_PROBE_RESP;
1960 
1961                                 if (rcu_access_pointer(sdata->u.ap.beacon))
1962                                         drv_start_ap(local, sdata);
1963                         }
1964 
1965                         /* fall through */
1966                 case NL80211_IFTYPE_MESH_POINT:
1967                         if (sdata->vif.bss_conf.enable_beacon) {
1968                                 changed |= BSS_CHANGED_BEACON |
1969                                            BSS_CHANGED_BEACON_ENABLED;
1970                                 ieee80211_bss_info_change_notify(sdata, changed);
1971                         }
1972                         break;
1973                 case NL80211_IFTYPE_WDS:
1974                 case NL80211_IFTYPE_AP_VLAN:
1975                 case NL80211_IFTYPE_MONITOR:
1976                 case NL80211_IFTYPE_P2P_DEVICE:
1977                         /* nothing to do */
1978                         break;
1979                 case NL80211_IFTYPE_UNSPECIFIED:
1980                 case NUM_NL80211_IFTYPES:
1981                 case NL80211_IFTYPE_P2P_CLIENT:
1982                 case NL80211_IFTYPE_P2P_GO:
1983                         WARN_ON(1);
1984                         break;
1985                 }
1986         }
1987 
1988         ieee80211_recalc_ps(local);
1989 
1990         /*
1991          * The sta might be in psm against the ap (e.g. because
1992          * this was the state before a hw restart), so we
1993          * explicitly send a null packet in order to make sure
1994          * it'll sync against the ap (and get out of psm).
1995          */
1996         if (!(local->hw.conf.flags & IEEE80211_CONF_PS)) {
1997                 list_for_each_entry(sdata, &local->interfaces, list) {
1998                         if (sdata->vif.type != NL80211_IFTYPE_STATION)
1999                                 continue;
2000                         if (!sdata->u.mgd.associated)
2001                                 continue;
2002 
2003                         ieee80211_send_nullfunc(local, sdata, false);
2004                 }
2005         }
2006 
2007         /* APs are now beaconing, add back stations */
2008         mutex_lock(&local->sta_mtx);
2009         list_for_each_entry(sta, &local->sta_list, list) {
2010                 enum ieee80211_sta_state state;
2011 
2012                 if (!sta->uploaded)
2013                         continue;
2014 
2015                 if (sta->sdata->vif.type != NL80211_IFTYPE_AP)
2016                         continue;
2017 
2018                 for (state = IEEE80211_STA_NOTEXIST;
2019                      state < sta->sta_state; state++)
2020                         WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
2021                                               state + 1));
2022         }
2023         mutex_unlock(&local->sta_mtx);
2024 
2025         /* add back keys */
2026         list_for_each_entry(sdata, &local->interfaces, list)
2027                 ieee80211_reset_crypto_tx_tailroom(sdata);
2028 
2029         list_for_each_entry(sdata, &local->interfaces, list)
2030                 if (ieee80211_sdata_running(sdata))
2031                         ieee80211_enable_keys(sdata);
2032 
2033         /* Reconfigure sched scan if it was interrupted by FW restart */
2034         mutex_lock(&local->mtx);
2035         sched_scan_sdata = rcu_dereference_protected(local->sched_scan_sdata,
2036                                                 lockdep_is_held(&local->mtx));
2037         sched_scan_req = rcu_dereference_protected(local->sched_scan_req,
2038                                                 lockdep_is_held(&local->mtx));
2039         if (sched_scan_sdata && sched_scan_req)
2040                 /*
2041                  * Sched scan stopped, but we don't want to report it. Instead,
2042                  * we're trying to reschedule. However, if more than one scan
2043                  * plan was set, we cannot reschedule since we don't know which
2044                  * scan plan was currently running (and some scan plans may have
2045                  * already finished).
2046                  */
2047                 if (sched_scan_req->n_scan_plans > 1 ||
2048                     __ieee80211_request_sched_scan_start(sched_scan_sdata,
2049                                                          sched_scan_req)) {
2050                         RCU_INIT_POINTER(local->sched_scan_sdata, NULL);
2051                         RCU_INIT_POINTER(local->sched_scan_req, NULL);
2052                         sched_scan_stopped = true;
2053                 }
2054         mutex_unlock(&local->mtx);
2055 
2056         if (sched_scan_stopped)
2057                 cfg80211_sched_scan_stopped_rtnl(local->hw.wiphy);
2058 
2059  wake_up:
2060         if (local->in_reconfig) {
2061                 local->in_reconfig = false;
2062                 barrier();
2063 
2064                 /* Restart deferred ROCs */
2065                 mutex_lock(&local->mtx);
2066                 ieee80211_start_next_roc(local);
2067                 mutex_unlock(&local->mtx);
2068         }
2069 
2070         if (local->monitors == local->open_count && local->monitors > 0)
2071                 ieee80211_add_virtual_monitor(local);
2072 
2073         /*
2074          * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
2075          * sessions can be established after a resume.
2076          *
2077          * Also tear down aggregation sessions since reconfiguring
2078          * them in a hardware restart scenario is not easily done
2079          * right now, and the hardware will have lost information
2080          * about the sessions, but we and the AP still think they
2081          * are active. This is really a workaround though.
2082          */
2083         if (ieee80211_hw_check(hw, AMPDU_AGGREGATION)) {
2084                 mutex_lock(&local->sta_mtx);
2085 
2086                 list_for_each_entry(sta, &local->sta_list, list) {
2087                         if (!local->resuming)
2088                                 ieee80211_sta_tear_down_BA_sessions(
2089                                                 sta, AGG_STOP_LOCAL_REQUEST);
2090                         clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
2091                 }
2092 
2093                 mutex_unlock(&local->sta_mtx);
2094         }
2095 
2096         ieee80211_wake_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
2097                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND,
2098                                         false);
2099 
2100         /*
2101          * If this is for hw restart things are still running.
2102          * We may want to change that later, however.
2103          */
2104         if (local->open_count && (!suspended || reconfig_due_to_wowlan))
2105                 drv_reconfig_complete(local, IEEE80211_RECONFIG_TYPE_RESTART);
2106 
2107         if (!suspended)
2108                 return 0;
2109 
2110 #ifdef CONFIG_PM
2111         /* first set suspended false, then resuming */
2112         local->suspended = false;
2113         mb();
2114         local->resuming = false;
2115 
2116         ieee80211_flush_completed_scan(local, false);
2117 
2118         if (local->open_count && !reconfig_due_to_wowlan)
2119                 drv_reconfig_complete(local, IEEE80211_RECONFIG_TYPE_SUSPEND);
2120 
2121         list_for_each_entry(sdata, &local->interfaces, list) {
2122                 if (!ieee80211_sdata_running(sdata))
2123                         continue;
2124                 if (sdata->vif.type == NL80211_IFTYPE_STATION)
2125                         ieee80211_sta_restart(sdata);
2126         }
2127 
2128         mod_timer(&local->sta_cleanup, jiffies + 1);
2129 #else
2130         WARN_ON(1);
2131 #endif
2132 
2133         return 0;
2134 }
2135 
2136 void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
2137 {
2138         struct ieee80211_sub_if_data *sdata;
2139         struct ieee80211_local *local;
2140         struct ieee80211_key *key;
2141 
2142         if (WARN_ON(!vif))
2143                 return;
2144 
2145         sdata = vif_to_sdata(vif);
2146         local = sdata->local;
2147 
2148         if (WARN_ON(!local->resuming))
2149                 return;
2150 
2151         if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
2152                 return;
2153 
2154         sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;
2155 
2156         mutex_lock(&local->key_mtx);
2157         list_for_each_entry(key, &sdata->key_list, list)
2158                 key->flags |= KEY_FLAG_TAINTED;
2159         mutex_unlock(&local->key_mtx);
2160 }
2161 EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);
2162 
2163 void ieee80211_recalc_smps(struct ieee80211_sub_if_data *sdata)
2164 {
2165         struct ieee80211_local *local = sdata->local;
2166         struct ieee80211_chanctx_conf *chanctx_conf;
2167         struct ieee80211_chanctx *chanctx;
2168 
2169         mutex_lock(&local->chanctx_mtx);
2170 
2171         chanctx_conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
2172                                         lockdep_is_held(&local->chanctx_mtx));
2173 
2174         /*
2175          * This function can be called from a work, thus it may be possible
2176          * that the chanctx_conf is removed (due to a disconnection, for
2177          * example).
2178          * So nothing should be done in such case.
2179          */
2180         if (!chanctx_conf)
2181                 goto unlock;
2182 
2183         chanctx = container_of(chanctx_conf, struct ieee80211_chanctx, conf);
2184         ieee80211_recalc_smps_chanctx(local, chanctx);
2185  unlock:
2186         mutex_unlock(&local->chanctx_mtx);
2187 }
2188 
2189 void ieee80211_recalc_min_chandef(struct ieee80211_sub_if_data *sdata)
2190 {
2191         struct ieee80211_local *local = sdata->local;
2192         struct ieee80211_chanctx_conf *chanctx_conf;
2193         struct ieee80211_chanctx *chanctx;
2194 
2195         mutex_lock(&local->chanctx_mtx);
2196 
2197         chanctx_conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
2198                                         lockdep_is_held(&local->chanctx_mtx));
2199 
2200         if (WARN_ON_ONCE(!chanctx_conf))
2201                 goto unlock;
2202 
2203         chanctx = container_of(chanctx_conf, struct ieee80211_chanctx, conf);
2204         ieee80211_recalc_chanctx_min_def(local, chanctx);
2205  unlock:
2206         mutex_unlock(&local->chanctx_mtx);
2207 }
2208 
2209 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
2210 {
2211         size_t pos = offset;
2212 
2213         while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
2214                 pos += 2 + ies[pos + 1];
2215 
2216         return pos;
2217 }
2218 
2219 static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
2220                                             int rssi_min_thold,
2221                                             int rssi_max_thold)
2222 {
2223         trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);
2224 
2225         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
2226                 return;
2227 
2228         /*
2229          * Scale up threshold values before storing it, as the RSSI averaging
2230          * algorithm uses a scaled up value as well. Change this scaling
2231          * factor if the RSSI averaging algorithm changes.
2232          */
2233         sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
2234         sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
2235 }
2236 
2237 void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
2238                                     int rssi_min_thold,
2239                                     int rssi_max_thold)
2240 {
2241         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2242 
2243         WARN_ON(rssi_min_thold == rssi_max_thold ||
2244                 rssi_min_thold > rssi_max_thold);
2245 
2246         _ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
2247                                        rssi_max_thold);
2248 }
2249 EXPORT_SYMBOL(ieee80211_enable_rssi_reports);
2250 
2251 void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
2252 {
2253         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2254 
2255         _ieee80211_enable_rssi_reports(sdata, 0, 0);
2256 }
2257 EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
2258 
2259 u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
2260                               u16 cap)
2261 {
2262         __le16 tmp;
2263 
2264         *pos++ = WLAN_EID_HT_CAPABILITY;
2265         *pos++ = sizeof(struct ieee80211_ht_cap);
2266         memset(pos, 0, sizeof(struct ieee80211_ht_cap));
2267 
2268         /* capability flags */
2269         tmp = cpu_to_le16(cap);
2270         memcpy(pos, &tmp, sizeof(u16));
2271         pos += sizeof(u16);
2272 
2273         /* AMPDU parameters */
2274         *pos++ = ht_cap->ampdu_factor |
2275                  (ht_cap->ampdu_density <<
2276                         IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
2277 
2278         /* MCS set */
2279         memcpy(pos, &ht_cap->mcs, sizeof(ht_cap->mcs));
2280         pos += sizeof(ht_cap->mcs);
2281 
2282         /* extended capabilities */
2283         pos += sizeof(__le16);
2284 
2285         /* BF capabilities */
2286         pos += sizeof(__le32);
2287 
2288         /* antenna selection */
2289         pos += sizeof(u8);
2290 
2291         return pos;
2292 }
2293 
2294 u8 *ieee80211_ie_build_vht_cap(u8 *pos, struct ieee80211_sta_vht_cap *vht_cap,
2295                                u32 cap)
2296 {
2297         __le32 tmp;
2298 
2299         *pos++ = WLAN_EID_VHT_CAPABILITY;
2300         *pos++ = sizeof(struct ieee80211_vht_cap);
2301         memset(pos, 0, sizeof(struct ieee80211_vht_cap));
2302 
2303         /* capability flags */
2304         tmp = cpu_to_le32(cap);
2305         memcpy(pos, &tmp, sizeof(u32));
2306         pos += sizeof(u32);
2307 
2308         /* VHT MCS set */
2309         memcpy(pos, &vht_cap->vht_mcs, sizeof(vht_cap->vht_mcs));
2310         pos += sizeof(vht_cap->vht_mcs);
2311 
2312         return pos;
2313 }
2314 
2315 u8 *ieee80211_ie_build_ht_oper(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
2316                                const struct cfg80211_chan_def *chandef,
2317                                u16 prot_mode, bool rifs_mode)
2318 {
2319         struct ieee80211_ht_operation *ht_oper;
2320         /* Build HT Information */
2321         *pos++ = WLAN_EID_HT_OPERATION;
2322         *pos++ = sizeof(struct ieee80211_ht_operation);
2323         ht_oper = (struct ieee80211_ht_operation *)pos;
2324         ht_oper->primary_chan = ieee80211_frequency_to_channel(
2325                                         chandef->chan->center_freq);
2326         switch (chandef->width) {
2327         case NL80211_CHAN_WIDTH_160:
2328         case NL80211_CHAN_WIDTH_80P80:
2329         case NL80211_CHAN_WIDTH_80:
2330         case NL80211_CHAN_WIDTH_40:
2331                 if (chandef->center_freq1 > chandef->chan->center_freq)
2332                         ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
2333                 else
2334                         ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
2335                 break;
2336         default:
2337                 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
2338                 break;
2339         }
2340         if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
2341             chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
2342             chandef->width != NL80211_CHAN_WIDTH_20)
2343                 ht_oper->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
2344 
2345         if (rifs_mode)
2346                 ht_oper->ht_param |= IEEE80211_HT_PARAM_RIFS_MODE;
2347 
2348         ht_oper->operation_mode = cpu_to_le16(prot_mode);
2349         ht_oper->stbc_param = 0x0000;
2350 
2351         /* It seems that Basic MCS set and Supported MCS set
2352            are identical for the first 10 bytes */
2353         memset(&ht_oper->basic_set, 0, 16);
2354         memcpy(&ht_oper->basic_set, &ht_cap->mcs, 10);
2355 
2356         return pos + sizeof(struct ieee80211_ht_operation);
2357 }
2358 
2359 u8 *ieee80211_ie_build_vht_oper(u8 *pos, struct ieee80211_sta_vht_cap *vht_cap,
2360                                 const struct cfg80211_chan_def *chandef)
2361 {
2362         struct ieee80211_vht_operation *vht_oper;
2363 
2364         *pos++ = WLAN_EID_VHT_OPERATION;
2365         *pos++ = sizeof(struct ieee80211_vht_operation);
2366         vht_oper = (struct ieee80211_vht_operation *)pos;
2367         vht_oper->center_freq_seg1_idx = ieee80211_frequency_to_channel(
2368                                                         chandef->center_freq1);
2369         if (chandef->center_freq2)
2370                 vht_oper->center_freq_seg2_idx =
2371                         ieee80211_frequency_to_channel(chandef->center_freq2);
2372         else
2373                 vht_oper->center_freq_seg2_idx = 0x00;
2374 
2375         switch (chandef->width) {
2376         case NL80211_CHAN_WIDTH_160:
2377                 /*
2378                  * Convert 160 MHz channel width to new style as interop
2379                  * workaround.
2380                  */
2381                 vht_oper->chan_width = IEEE80211_VHT_CHANWIDTH_80MHZ;
2382                 vht_oper->center_freq_seg2_idx = vht_oper->center_freq_seg1_idx;
2383                 if (chandef->chan->center_freq < chandef->center_freq1)
2384                         vht_oper->center_freq_seg1_idx -= 8;
2385                 else
2386                         vht_oper->center_freq_seg1_idx += 8;
2387                 break;
2388         case NL80211_CHAN_WIDTH_80P80:
2389                 /*
2390                  * Convert 80+80 MHz channel width to new style as interop
2391                  * workaround.
2392                  */
2393                 vht_oper->chan_width = IEEE80211_VHT_CHANWIDTH_80MHZ;
2394                 break;
2395         case NL80211_CHAN_WIDTH_80:
2396                 vht_oper->chan_width = IEEE80211_VHT_CHANWIDTH_80MHZ;
2397                 break;
2398         default:
2399                 vht_oper->chan_width = IEEE80211_VHT_CHANWIDTH_USE_HT;
2400                 break;
2401         }
2402 
2403         /* don't require special VHT peer rates */
2404         vht_oper->basic_mcs_set = cpu_to_le16(0xffff);
2405 
2406         return pos + sizeof(struct ieee80211_vht_operation);
2407 }
2408 
2409 bool ieee80211_chandef_ht_oper(const struct ieee80211_ht_operation *ht_oper,
2410                                struct cfg80211_chan_def *chandef)
2411 {
2412         enum nl80211_channel_type channel_type;
2413 
2414         if (!ht_oper)
2415                 return false;
2416 
2417         switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
2418         case IEEE80211_HT_PARAM_CHA_SEC_NONE:
2419                 channel_type = NL80211_CHAN_HT20;
2420                 break;
2421         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
2422                 channel_type = NL80211_CHAN_HT40PLUS;
2423                 break;
2424         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
2425                 channel_type = NL80211_CHAN_HT40MINUS;
2426                 break;
2427         default:
2428                 channel_type = NL80211_CHAN_NO_HT;
2429                 return false;
2430         }
2431 
2432         cfg80211_chandef_create(chandef, chandef->chan, channel_type);
2433         return true;
2434 }
2435 
2436 bool ieee80211_chandef_vht_oper(const struct ieee80211_vht_operation *oper,
2437                                 struct cfg80211_chan_def *chandef)
2438 {
2439         struct cfg80211_chan_def new = *chandef;
2440         int cf1, cf2;
2441 
2442         if (!oper)
2443                 return false;
2444 
2445         cf1 = ieee80211_channel_to_frequency(oper->center_freq_seg1_idx,
2446                                              chandef->chan->band);
2447         cf2 = ieee80211_channel_to_frequency(oper->center_freq_seg2_idx,
2448                                              chandef->chan->band);
2449 
2450         switch (oper->chan_width) {
2451         case IEEE80211_VHT_CHANWIDTH_USE_HT:
2452                 break;
2453         case IEEE80211_VHT_CHANWIDTH_80MHZ:
2454                 new.width = NL80211_CHAN_WIDTH_80;
2455                 new.center_freq1 = cf1;
2456                 /* If needed, adjust based on the newer interop workaround. */
2457                 if (oper->center_freq_seg2_idx) {
2458                         unsigned int diff;
2459 
2460                         diff = abs(oper->center_freq_seg2_idx -
2461                                    oper->center_freq_seg1_idx);
2462                         if (diff == 8) {
2463                                 new.width = NL80211_CHAN_WIDTH_160;
2464                                 new.center_freq1 = cf2;
2465                         } else if (diff > 8) {
2466                                 new.width = NL80211_CHAN_WIDTH_80P80;
2467                                 new.center_freq2 = cf2;
2468                         }
2469                 }
2470                 break;
2471         case IEEE80211_VHT_CHANWIDTH_160MHZ:
2472                 new.width = NL80211_CHAN_WIDTH_160;
2473                 new.center_freq1 = cf1;
2474                 break;
2475         case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
2476                 new.width = NL80211_CHAN_WIDTH_80P80;
2477                 new.center_freq1 = cf1;
2478                 new.center_freq2 = cf2;
2479                 break;
2480         default:
2481                 return false;
2482         }
2483 
2484         if (!cfg80211_chandef_valid(&new))
2485                 return false;
2486 
2487         *chandef = new;
2488         return true;
2489 }
2490 
2491 int ieee80211_parse_bitrates(struct cfg80211_chan_def *chandef,
2492                              const struct ieee80211_supported_band *sband,
2493                              const u8 *srates, int srates_len, u32 *rates)
2494 {
2495         u32 rate_flags = ieee80211_chandef_rate_flags(chandef);
2496         int shift = ieee80211_chandef_get_shift(chandef);
2497         struct ieee80211_rate *br;
2498         int brate, rate, i, j, count = 0;
2499 
2500         *rates = 0;
2501 
2502         for (i = 0; i < srates_len; i++) {
2503                 rate = srates[i] & 0x7f;
2504 
2505                 for (j = 0; j < sband->n_bitrates; j++) {
2506                         br = &sband->bitrates[j];
2507                         if ((rate_flags & br->flags) != rate_flags)
2508                                 continue;
2509 
2510                         brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2511                         if (brate == rate) {
2512                                 *rates |= BIT(j);
2513                                 count++;
2514                                 break;
2515                         }
2516                 }
2517         }
2518         return count;
2519 }
2520 
2521 int ieee80211_add_srates_ie(struct ieee80211_sub_if_data *sdata,
2522                             struct sk_buff *skb, bool need_basic,
2523                             enum ieee80211_band band)
2524 {
2525         struct ieee80211_local *local = sdata->local;
2526         struct ieee80211_supported_band *sband;
2527         int rate, shift;
2528         u8 i, rates, *pos;
2529         u32 basic_rates = sdata->vif.bss_conf.basic_rates;
2530         u32 rate_flags;
2531 
2532         shift = ieee80211_vif_get_shift(&sdata->vif);
2533         rate_flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
2534         sband = local->hw.wiphy->bands[band];
2535         rates = 0;
2536         for (i = 0; i < sband->n_bitrates; i++) {
2537                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
2538                         continue;
2539                 rates++;
2540         }
2541         if (rates > 8)
2542                 rates = 8;
2543 
2544         if (skb_tailroom(skb) < rates + 2)
2545                 return -ENOMEM;
2546 
2547         pos = skb_put(skb, rates + 2);
2548         *pos++ = WLAN_EID_SUPP_RATES;
2549         *pos++ = rates;
2550         for (i = 0; i < rates; i++) {
2551                 u8 basic = 0;
2552                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
2553                         continue;
2554 
2555                 if (need_basic && basic_rates & BIT(i))
2556                         basic = 0x80;
2557                 rate = sband->bitrates[i].bitrate;
2558                 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
2559                                     5 * (1 << shift));
2560                 *pos++ = basic | (u8) rate;
2561         }
2562 
2563         return 0;
2564 }
2565 
2566 int ieee80211_add_ext_srates_ie(struct ieee80211_sub_if_data *sdata,
2567                                 struct sk_buff *skb, bool need_basic,
2568                                 enum ieee80211_band band)
2569 {
2570         struct ieee80211_local *local = sdata->local;
2571         struct ieee80211_supported_band *sband;
2572         int rate, shift;
2573         u8 i, exrates, *pos;
2574         u32 basic_rates = sdata->vif.bss_conf.basic_rates;
2575         u32 rate_flags;
2576 
2577         rate_flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
2578         shift = ieee80211_vif_get_shift(&sdata->vif);
2579 
2580         sband = local->hw.wiphy->bands[band];
2581         exrates = 0;
2582         for (i = 0; i < sband->n_bitrates; i++) {
2583                 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
2584                         continue;
2585                 exrates++;
2586         }
2587 
2588         if (exrates > 8)
2589                 exrates -= 8;
2590         else
2591                 exrates = 0;
2592 
2593         if (skb_tailroom(skb) < exrates + 2)
2594                 return -ENOMEM;
2595 
2596         if (exrates) {
2597                 pos = skb_put(skb, exrates + 2);
2598                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
2599                 *pos++ = exrates;
2600                 for (i = 8; i < sband->n_bitrates; i++) {
2601                         u8 basic = 0;
2602                         if ((rate_flags & sband->bitrates[i].flags)
2603                             != rate_flags)
2604                                 continue;
2605                         if (need_basic && basic_rates & BIT(i))
2606                                 basic = 0x80;
2607                         rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
2608                                             5 * (1 << shift));
2609                         *pos++ = basic | (u8) rate;
2610                 }
2611         }
2612         return 0;
2613 }
2614 
2615 int ieee80211_ave_rssi(struct ieee80211_vif *vif)
2616 {
2617         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2618         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2619 
2620         if (WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_STATION)) {
2621                 /* non-managed type inferfaces */
2622                 return 0;
2623         }
2624         return -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
2625 }
2626 EXPORT_SYMBOL_GPL(ieee80211_ave_rssi);
2627 
2628 u8 ieee80211_mcs_to_chains(const struct ieee80211_mcs_info *mcs)
2629 {
2630         if (!mcs)
2631                 return 1;
2632 
2633         /* TODO: consider rx_highest */
2634 
2635         if (mcs->rx_mask[3])
2636                 return 4;
2637         if (mcs->rx_mask[2])
2638                 return 3;
2639         if (mcs->rx_mask[1])
2640                 return 2;
2641         return 1;
2642 }
2643 
2644 /**
2645  * ieee80211_calculate_rx_timestamp - calculate timestamp in frame
2646  * @local: mac80211 hw info struct
2647  * @status: RX status
2648  * @mpdu_len: total MPDU length (including FCS)
2649  * @mpdu_offset: offset into MPDU to calculate timestamp at
2650  *
2651  * This function calculates the RX timestamp at the given MPDU offset, taking
2652  * into account what the RX timestamp was. An offset of 0 will just normalize
2653  * the timestamp to TSF at beginning of MPDU reception.
2654  */
2655 u64 ieee80211_calculate_rx_timestamp(struct ieee80211_local *local,
2656                                      struct ieee80211_rx_status *status,
2657                                      unsigned int mpdu_len,
2658                                      unsigned int mpdu_offset)
2659 {
2660         u64 ts = status->mactime;
2661         struct rate_info ri;
2662         u16 rate;
2663 
2664         if (WARN_ON(!ieee80211_have_rx_timestamp(status)))
2665                 return 0;
2666 
2667         memset(&ri, 0, sizeof(ri));
2668 
2669         /* Fill cfg80211 rate info */
2670         if (status->flag & RX_FLAG_HT) {
2671                 ri.mcs = status->rate_idx;
2672                 ri.flags |= RATE_INFO_FLAGS_MCS;
2673                 if (status->flag & RX_FLAG_40MHZ)
2674                         ri.bw = RATE_INFO_BW_40;
2675                 else
2676                         ri.bw = RATE_INFO_BW_20;
2677                 if (status->flag & RX_FLAG_SHORT_GI)
2678                         ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
2679         } else if (status->flag & RX_FLAG_VHT) {
2680                 ri.flags |= RATE_INFO_FLAGS_VHT_MCS;
2681                 ri.mcs = status->rate_idx;
2682                 ri.nss = status->vht_nss;
2683                 if (status->flag & RX_FLAG_40MHZ)
2684                         ri.bw = RATE_INFO_BW_40;
2685                 else if (status->vht_flag & RX_VHT_FLAG_80MHZ)
2686                         ri.bw = RATE_INFO_BW_80;
2687                 else if (status->vht_flag & RX_VHT_FLAG_160MHZ)
2688                         ri.bw = RATE_INFO_BW_160;
2689                 else
2690                         ri.bw = RATE_INFO_BW_20;
2691                 if (status->flag & RX_FLAG_SHORT_GI)
2692                         ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
2693         } else {
2694                 struct ieee80211_supported_band *sband;
2695                 int shift = 0;
2696                 int bitrate;
2697 
2698                 if (status->flag & RX_FLAG_10MHZ) {
2699                         shift = 1;
2700                         ri.bw = RATE_INFO_BW_10;
2701                 } else if (status->flag & RX_FLAG_5MHZ) {
2702                         shift = 2;
2703                         ri.bw = RATE_INFO_BW_5;
2704                 } else {
2705                         ri.bw = RATE_INFO_BW_20;
2706                 }
2707 
2708                 sband = local->hw.wiphy->bands[status->band];
2709                 bitrate = sband->bitrates[status->rate_idx].bitrate;
2710                 ri.legacy = DIV_ROUND_UP(bitrate, (1 << shift));
2711 
2712                 if (status->flag & RX_FLAG_MACTIME_PLCP_START) {
2713                         /* TODO: handle HT/VHT preambles */
2714                         if (status->band == IEEE80211_BAND_5GHZ) {
2715                                 ts += 20 << shift;
2716                                 mpdu_offset += 2;
2717                         } else if (status->flag & RX_FLAG_SHORTPRE) {
2718                                 ts += 96;
2719                         } else {
2720                                 ts += 192;
2721                         }
2722                 }
2723         }
2724 
2725         rate = cfg80211_calculate_bitrate(&ri);
2726         if (WARN_ONCE(!rate,
2727                       "Invalid bitrate: flags=0x%x, idx=%d, vht_nss=%d\n",
2728                       status->flag, status->rate_idx, status->vht_nss))
2729                 return 0;
2730 
2731         /* rewind from end of MPDU */
2732         if (status->flag & RX_FLAG_MACTIME_END)
2733                 ts -= mpdu_len * 8 * 10 / rate;
2734 
2735         ts += mpdu_offset * 8 * 10 / rate;
2736 
2737         return ts;
2738 }
2739 
2740 void ieee80211_dfs_cac_cancel(struct ieee80211_local *local)
2741 {
2742         struct ieee80211_sub_if_data *sdata;
2743         struct cfg80211_chan_def chandef;
2744 
2745         mutex_lock(&local->mtx);
2746         mutex_lock(&local->iflist_mtx);
2747         list_for_each_entry(sdata, &local->interfaces, list) {
2748                 /* it might be waiting for the local->mtx, but then
2749                  * by the time it gets it, sdata->wdev.cac_started
2750                  * will no longer be true
2751                  */
2752                 cancel_delayed_work(&sdata->dfs_cac_timer_work);
2753 
2754                 if (sdata->wdev.cac_started) {
2755                         chandef = sdata->vif.bss_conf.chandef;
2756                         ieee80211_vif_release_channel(sdata);
2757                         cfg80211_cac_event(sdata->dev,
2758                                            &chandef,
2759                                            NL80211_RADAR_CAC_ABORTED,
2760                                            GFP_KERNEL);
2761                 }
2762         }
2763         mutex_unlock(&local->iflist_mtx);
2764         mutex_unlock(&local->mtx);
2765 }
2766 
2767 void ieee80211_dfs_radar_detected_work(struct work_struct *work)
2768 {
2769         struct ieee80211_local *local =
2770                 container_of(work, struct ieee80211_local, radar_detected_work);
2771         struct cfg80211_chan_def chandef = local->hw.conf.chandef;
2772         struct ieee80211_chanctx *ctx;
2773         int num_chanctx = 0;
2774 
2775         mutex_lock(&local->chanctx_mtx);
2776         list_for_each_entry(ctx, &local->chanctx_list, list) {
2777                 if (ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER)
2778                         continue;
2779 
2780                 num_chanctx++;
2781                 chandef = ctx->conf.def;
2782         }
2783         mutex_unlock(&local->chanctx_mtx);
2784 
2785         ieee80211_dfs_cac_cancel(local);
2786 
2787         if (num_chanctx > 1)
2788                 /* XXX: multi-channel is not supported yet */
2789                 WARN_ON(1);
2790         else
2791                 cfg80211_radar_event(local->hw.wiphy, &chandef, GFP_KERNEL);
2792 }
2793 
2794 void ieee80211_radar_detected(struct ieee80211_hw *hw)
2795 {
2796         struct ieee80211_local *local = hw_to_local(hw);
2797 
2798         trace_api_radar_detected(local);
2799 
2800         ieee80211_queue_work(hw, &local->radar_detected_work);
2801 }
2802 EXPORT_SYMBOL(ieee80211_radar_detected);
2803 
2804 u32 ieee80211_chandef_downgrade(struct cfg80211_chan_def *c)
2805 {
2806         u32 ret;
2807         int tmp;
2808 
2809         switch (c->width) {
2810         case NL80211_CHAN_WIDTH_20:
2811                 c->width = NL80211_CHAN_WIDTH_20_NOHT;
2812                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
2813                 break;
2814         case NL80211_CHAN_WIDTH_40:
2815                 c->width = NL80211_CHAN_WIDTH_20;
2816                 c->center_freq1 = c->chan->center_freq;
2817                 ret = IEEE80211_STA_DISABLE_40MHZ |
2818                       IEEE80211_STA_DISABLE_VHT;
2819                 break;
2820         case NL80211_CHAN_WIDTH_80:
2821                 tmp = (30 + c->chan->center_freq - c->center_freq1)/20;
2822                 /* n_P40 */
2823                 tmp /= 2;
2824                 /* freq_P40 */
2825                 c->center_freq1 = c->center_freq1 - 20 + 40 * tmp;
2826                 c->width = NL80211_CHAN_WIDTH_40;
2827                 ret = IEEE80211_STA_DISABLE_VHT;
2828                 break;
2829         case NL80211_CHAN_WIDTH_80P80:
2830                 c->center_freq2 = 0;
2831                 c->width = NL80211_CHAN_WIDTH_80;
2832                 ret = IEEE80211_STA_DISABLE_80P80MHZ |
2833                       IEEE80211_STA_DISABLE_160MHZ;
2834                 break;
2835         case NL80211_CHAN_WIDTH_160:
2836                 /* n_P20 */
2837                 tmp = (70 + c->chan->center_freq - c->center_freq1)/20;
2838                 /* n_P80 */
2839                 tmp /= 4;
2840                 c->center_freq1 = c->center_freq1 - 40 + 80 * tmp;
2841                 c->width = NL80211_CHAN_WIDTH_80;
2842                 ret = IEEE80211_STA_DISABLE_80P80MHZ |
2843                       IEEE80211_STA_DISABLE_160MHZ;
2844                 break;
2845         default:
2846         case NL80211_CHAN_WIDTH_20_NOHT:
2847                 WARN_ON_ONCE(1);
2848                 c->width = NL80211_CHAN_WIDTH_20_NOHT;
2849                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
2850                 break;
2851         case NL80211_CHAN_WIDTH_5:
2852         case NL80211_CHAN_WIDTH_10:
2853                 WARN_ON_ONCE(1);
2854                 /* keep c->width */
2855                 ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
2856                 break;
2857         }
2858 
2859         WARN_ON_ONCE(!cfg80211_chandef_valid(c));
2860 
2861         return ret;
2862 }
2863 
2864 /*
2865  * Returns true if smps_mode_new is strictly more restrictive than
2866  * smps_mode_old.
2867  */
2868 bool ieee80211_smps_is_restrictive(enum ieee80211_smps_mode smps_mode_old,
2869                                    enum ieee80211_smps_mode smps_mode_new)
2870 {
2871         if (WARN_ON_ONCE(smps_mode_old == IEEE80211_SMPS_AUTOMATIC ||
2872                          smps_mode_new == IEEE80211_SMPS_AUTOMATIC))
2873                 return false;
2874 
2875         switch (smps_mode_old) {
2876         case IEEE80211_SMPS_STATIC:
2877                 return false;
2878         case IEEE80211_SMPS_DYNAMIC:
2879                 return smps_mode_new == IEEE80211_SMPS_STATIC;
2880         case IEEE80211_SMPS_OFF:
2881                 return smps_mode_new != IEEE80211_SMPS_OFF;
2882         default:
2883                 WARN_ON(1);
2884         }
2885 
2886         return false;
2887 }
2888 
2889 int ieee80211_send_action_csa(struct ieee80211_sub_if_data *sdata,
2890                               struct cfg80211_csa_settings *csa_settings)
2891 {
2892         struct sk_buff *skb;
2893         struct ieee80211_mgmt *mgmt;
2894         struct ieee80211_local *local = sdata->local;
2895         int freq;
2896         int hdr_len = offsetof(struct ieee80211_mgmt, u.action.u.chan_switch) +
2897                                sizeof(mgmt->u.action.u.chan_switch);
2898         u8 *pos;
2899 
2900         if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
2901             sdata->vif.type != NL80211_IFTYPE_MESH_POINT)
2902                 return -EOPNOTSUPP;
2903 
2904         skb = dev_alloc_skb(local->tx_headroom + hdr_len +
2905                             5 + /* channel switch announcement element */
2906                             3 + /* secondary channel offset element */
2907                             8); /* mesh channel switch parameters element */
2908         if (!skb)
2909                 return -ENOMEM;
2910 
2911         skb_reserve(skb, local->tx_headroom);
2912         mgmt = (struct ieee80211_mgmt *)skb_put(skb, hdr_len);
2913         memset(mgmt, 0, hdr_len);
2914         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
2915                                           IEEE80211_STYPE_ACTION);
2916 
2917         eth_broadcast_addr(mgmt->da);
2918         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
2919         if (ieee80211_vif_is_mesh(&sdata->vif)) {
2920                 memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
2921         } else {
2922                 struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
2923                 memcpy(mgmt->bssid, ifibss->bssid, ETH_ALEN);
2924         }
2925         mgmt->u.action.category = WLAN_CATEGORY_SPECTRUM_MGMT;
2926         mgmt->u.action.u.chan_switch.action_code = WLAN_ACTION_SPCT_CHL_SWITCH;
2927         pos = skb_put(skb, 5);
2928         *pos++ = WLAN_EID_CHANNEL_SWITCH;                       /* EID */
2929         *pos++ = 3;                                             /* IE length */
2930         *pos++ = csa_settings->block_tx ? 1 : 0;                /* CSA mode */
2931         freq = csa_settings->chandef.chan->center_freq;
2932         *pos++ = ieee80211_frequency_to_channel(freq);          /* channel */
2933         *pos++ = csa_settings->count;                           /* count */
2934 
2935         if (csa_settings->chandef.width == NL80211_CHAN_WIDTH_40) {
2936                 enum nl80211_channel_type ch_type;
2937 
2938                 skb_put(skb, 3);
2939                 *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET;     /* EID */
2940                 *pos++ = 1;                                     /* IE length */
2941                 ch_type = cfg80211_get_chandef_type(&csa_settings->chandef);
2942                 if (ch_type == NL80211_CHAN_HT40PLUS)
2943                         *pos++ = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
2944                 else
2945                         *pos++ = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
2946         }
2947 
2948         if (ieee80211_vif_is_mesh(&sdata->vif)) {
2949                 struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
2950 
2951                 skb_put(skb, 8);
2952                 *pos++ = WLAN_EID_CHAN_SWITCH_PARAM;            /* EID */
2953                 *pos++ = 6;                                     /* IE length */
2954                 *pos++ = sdata->u.mesh.mshcfg.dot11MeshTTL;     /* Mesh TTL */
2955                 *pos = 0x00;    /* Mesh Flag: Tx Restrict, Initiator, Reason */
2956                 *pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
2957                 *pos++ |= csa_settings->block_tx ?
2958                           WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00;
2959                 put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos); /* Reason Cd */
2960                 pos += 2;
2961                 put_unaligned_le16(ifmsh->pre_value, pos);/* Precedence Value */
2962                 pos += 2;
2963         }
2964 
2965         ieee80211_tx_skb(sdata, skb);
2966         return 0;
2967 }
2968 
2969 bool ieee80211_cs_valid(const struct ieee80211_cipher_scheme *cs)
2970 {
2971         return !(cs == NULL || cs->cipher == 0 ||
2972                  cs->hdr_len < cs->pn_len + cs->pn_off ||
2973                  cs->hdr_len <= cs->key_idx_off ||
2974                  cs->key_idx_shift > 7 ||
2975                  cs->key_idx_mask == 0);
2976 }
2977 
2978 bool ieee80211_cs_list_valid(const struct ieee80211_cipher_scheme *cs, int n)
2979 {
2980         int i;
2981 
2982         /* Ensure we have enough iftype bitmap space for all iftype values */
2983         WARN_ON((NUM_NL80211_IFTYPES / 8 + 1) > sizeof(cs[0].iftype));
2984 
2985         for (i = 0; i < n; i++)
2986                 if (!ieee80211_cs_valid(&cs[i]))
2987                         return false;
2988 
2989         return true;
2990 }
2991 
2992 const struct ieee80211_cipher_scheme *
2993 ieee80211_cs_get(struct ieee80211_local *local, u32 cipher,
2994                  enum nl80211_iftype iftype)
2995 {
2996         const struct ieee80211_cipher_scheme *l = local->hw.cipher_schemes;
2997         int n = local->hw.n_cipher_schemes;
2998         int i;
2999         const struct ieee80211_cipher_scheme *cs = NULL;
3000 
3001         for (i = 0; i < n; i++) {
3002                 if (l[i].cipher == cipher) {
3003                         cs = &l[i];
3004                         break;
3005                 }
3006         }
3007 
3008         if (!cs || !(cs->iftype & BIT(iftype)))
3009                 return NULL;
3010 
3011         return cs;
3012 }
3013 
3014 int ieee80211_cs_headroom(struct ieee80211_local *local,
3015                           struct cfg80211_crypto_settings *crypto,
3016                           enum nl80211_iftype iftype)
3017 {
3018         const struct ieee80211_cipher_scheme *cs;
3019         int headroom = IEEE80211_ENCRYPT_HEADROOM;
3020         int i;
3021 
3022         for (i = 0; i < crypto->n_ciphers_pairwise; i++) {
3023                 cs = ieee80211_cs_get(local, crypto->ciphers_pairwise[i],
3024                                       iftype);
3025 
3026                 if (cs && headroom < cs->hdr_len)
3027                         headroom = cs->hdr_len;
3028         }
3029 
3030         cs = ieee80211_cs_get(local, crypto->cipher_group, iftype);
3031         if (cs && headroom < cs->hdr_len)
3032                 headroom = cs->hdr_len;
3033 
3034         return headroom;
3035 }
3036 
3037 static bool
3038 ieee80211_extend_noa_desc(struct ieee80211_noa_data *data, u32 tsf, int i)
3039 {
3040         s32 end = data->desc[i].start + data->desc[i].duration - (tsf + 1);
3041         int skip;
3042 
3043         if (end > 0)
3044                 return false;
3045 
3046         /* One shot NOA  */
3047         if (data->count[i] == 1)
3048                 return false;
3049 
3050         if (data->desc[i].interval == 0)
3051                 return false;
3052 
3053         /* End time is in the past, check for repetitions */
3054         skip = DIV_ROUND_UP(-end, data->desc[i].interval);
3055         if (data->count[i] < 255) {
3056                 if (data->count[i] <= skip) {
3057                         data->count[i] = 0;
3058                         return false;
3059                 }
3060 
3061                 data->count[i] -= skip;
3062         }
3063 
3064         data->desc[i].start += skip * data->desc[i].interval;
3065 
3066         return true;
3067 }
3068 
3069 static bool
3070 ieee80211_extend_absent_time(struct ieee80211_noa_data *data, u32 tsf,
3071                              s32 *offset)
3072 {
3073         bool ret = false;
3074         int i;
3075 
3076         for (i = 0; i < IEEE80211_P2P_NOA_DESC_MAX; i++) {
3077                 s32 cur;
3078 
3079                 if (!data->count[i])
3080                         continue;
3081 
3082                 if (ieee80211_extend_noa_desc(data, tsf + *offset, i))
3083                         ret = true;
3084 
3085                 cur = data->desc[i].start - tsf;
3086                 if (cur > *offset)
3087                         continue;
3088 
3089                 cur = data->desc[i].start + data->desc[i].duration - tsf;
3090                 if (cur > *offset)
3091                         *offset = cur;
3092         }
3093 
3094         return ret;
3095 }
3096 
3097 static u32
3098 ieee80211_get_noa_absent_time(struct ieee80211_noa_data *data, u32 tsf)
3099 {
3100         s32 offset = 0;
3101         int tries = 0;
3102         /*
3103          * arbitrary limit, used to avoid infinite loops when combined NoA
3104          * descriptors cover the full time period.
3105          */
3106         int max_tries = 5;
3107 
3108         ieee80211_extend_absent_time(data, tsf, &offset);
3109         do {
3110                 if (!ieee80211_extend_absent_time(data, tsf, &offset))
3111                         break;
3112 
3113                 tries++;
3114         } while (tries < max_tries);
3115 
3116         return offset;
3117 }
3118 
3119 void ieee80211_update_p2p_noa(struct ieee80211_noa_data *data, u32 tsf)
3120 {
3121         u32 next_offset = BIT(31) - 1;
3122         int i;
3123 
3124         data->absent = 0;
3125         data->has_next_tsf = false;
3126         for (i = 0; i < IEEE80211_P2P_NOA_DESC_MAX; i++) {
3127                 s32 start;
3128 
3129                 if (!data->count[i])
3130                         continue;
3131 
3132                 ieee80211_extend_noa_desc(data, tsf, i);
3133                 start = data->desc[i].start - tsf;
3134                 if (start <= 0)
3135                         data->absent |= BIT(i);
3136 
3137                 if (next_offset > start)
3138                         next_offset = start;
3139 
3140                 data->has_next_tsf = true;
3141         }
3142 
3143         if (data->absent)
3144                 next_offset = ieee80211_get_noa_absent_time(data, tsf);
3145 
3146         data->next_tsf = tsf + next_offset;
3147 }
3148 EXPORT_SYMBOL(ieee80211_update_p2p_noa);
3149 
3150 int ieee80211_parse_p2p_noa(const struct ieee80211_p2p_noa_attr *attr,
3151                             struct ieee80211_noa_data *data, u32 tsf)
3152 {
3153         int ret = 0;
3154         int i;
3155 
3156         memset(data, 0, sizeof(*data));
3157 
3158         for (i = 0; i < IEEE80211_P2P_NOA_DESC_MAX; i++) {
3159                 const struct ieee80211_p2p_noa_desc *desc = &attr->desc[i];
3160 
3161                 if (!desc->count || !desc->duration)
3162                         continue;
3163 
3164                 data->count[i] = desc->count;
3165                 data->desc[i].start = le32_to_cpu(desc->start_time);
3166                 data->desc[i].duration = le32_to_cpu(desc->duration);
3167                 data->desc[i].interval = le32_to_cpu(desc->interval);
3168 
3169                 if (data->count[i] > 1 &&
3170                     data->desc[i].interval < data->desc[i].duration)
3171                         continue;
3172 
3173                 ieee80211_extend_noa_desc(data, tsf, i);
3174                 ret++;
3175         }
3176 
3177         if (ret)
3178                 ieee80211_update_p2p_noa(data, tsf);
3179 
3180         return ret;
3181 }
3182 EXPORT_SYMBOL(ieee80211_parse_p2p_noa);
3183 
3184 void ieee80211_recalc_dtim(struct ieee80211_local *local,
3185                            struct ieee80211_sub_if_data *sdata)
3186 {
3187         u64 tsf = drv_get_tsf(local, sdata);
3188         u64 dtim_count = 0;
3189         u16 beacon_int = sdata->vif.bss_conf.beacon_int * 1024;
3190         u8 dtim_period = sdata->vif.bss_conf.dtim_period;
3191         struct ps_data *ps;
3192         u8 bcns_from_dtim;
3193 
3194         if (tsf == -1ULL || !beacon_int || !dtim_period)
3195                 return;
3196 
3197         if (sdata->vif.type == NL80211_IFTYPE_AP ||
3198             sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
3199                 if (!sdata->bss)
3200                         return;
3201 
3202                 ps = &sdata->bss->ps;
3203         } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
3204                 ps = &sdata->u.mesh.ps;
3205         } else {
3206                 return;
3207         }
3208 
3209         /*
3210          * actually finds last dtim_count, mac80211 will update in
3211          * __beacon_add_tim().
3212          * dtim_count = dtim_period - (tsf / bcn_int) % dtim_period
3213          */
3214         do_div(tsf, beacon_int);
3215         bcns_from_dtim = do_div(tsf, dtim_period);
3216         /* just had a DTIM */
3217         if (!bcns_from_dtim)
3218                 dtim_count = 0;
3219         else
3220                 dtim_count = dtim_period - bcns_from_dtim;
3221 
3222         ps->dtim_count = dtim_count;
3223 }
3224 
3225 static u8 ieee80211_chanctx_radar_detect(struct ieee80211_local *local,
3226                                          struct ieee80211_chanctx *ctx)
3227 {
3228         struct ieee80211_sub_if_data *sdata;
3229         u8 radar_detect = 0;
3230 
3231         lockdep_assert_held(&local->chanctx_mtx);
3232 
3233         if (WARN_ON(ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED))
3234                 return 0;
3235 
3236         list_for_each_entry(sdata, &ctx->reserved_vifs, reserved_chanctx_list)
3237                 if (sdata->reserved_radar_required)
3238                         radar_detect |= BIT(sdata->reserved_chandef.width);
3239 
3240         /*
3241          * An in-place reservation context should not have any assigned vifs
3242          * until it replaces the other context.
3243          */
3244         WARN_ON(ctx->replace_state == IEEE80211_CHANCTX_REPLACES_OTHER &&
3245                 !list_empty(&ctx->assigned_vifs));
3246 
3247         list_for_each_entry(sdata, &ctx->assigned_vifs, assigned_chanctx_list)
3248                 if (sdata->radar_required)
3249                         radar_detect |= BIT(sdata->vif.bss_conf.chandef.width);
3250 
3251         return radar_detect;
3252 }
3253 
3254 int ieee80211_check_combinations(struct ieee80211_sub_if_data *sdata,
3255                                  const struct cfg80211_chan_def *chandef,
3256                                  enum ieee80211_chanctx_mode chanmode,
3257                                  u8 radar_detect)
3258 {
3259         struct ieee80211_local *local = sdata->local;
3260         struct ieee80211_sub_if_data *sdata_iter;
3261         enum nl80211_iftype iftype = sdata->wdev.iftype;
3262         int num[NUM_NL80211_IFTYPES];
3263         struct ieee80211_chanctx *ctx;
3264         int num_different_channels = 0;
3265         int total = 1;
3266 
3267         lockdep_assert_held(&local->chanctx_mtx);
3268 
3269         if (WARN_ON(hweight32(radar_detect) > 1))
3270                 return -EINVAL;
3271 
3272         if (WARN_ON(chandef && chanmode == IEEE80211_CHANCTX_SHARED &&
3273                     !chandef->chan))
3274                 return -EINVAL;
3275 
3276         if (chandef)
3277                 num_different_channels = 1;
3278 
3279         if (WARN_ON(iftype >= NUM_NL80211_IFTYPES))
3280                 return -EINVAL;
3281 
3282         /* Always allow software iftypes */
3283         if (local->hw.wiphy->software_iftypes & BIT(iftype)) {
3284                 if (radar_detect)
3285                         return -EINVAL;
3286                 return 0;
3287         }
3288 
3289         memset(num, 0, sizeof(num));
3290 
3291         if (iftype != NL80211_IFTYPE_UNSPECIFIED)
3292                 num[iftype] = 1;
3293 
3294         list_for_each_entry(ctx, &local->chanctx_list, list) {
3295                 if (ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED)
3296                         continue;
3297                 radar_detect |= ieee80211_chanctx_radar_detect(local, ctx);
3298                 if (ctx->mode == IEEE80211_CHANCTX_EXCLUSIVE) {
3299                         num_different_channels++;
3300                         continue;
3301                 }
3302                 if (chandef && chanmode == IEEE80211_CHANCTX_SHARED &&
3303                     cfg80211_chandef_compatible(chandef,
3304                                                 &ctx->conf.def))
3305                         continue;
3306                 num_different_channels++;
3307         }
3308 
3309         list_for_each_entry_rcu(sdata_iter, &local->interfaces, list) {
3310                 struct wireless_dev *wdev_iter;
3311 
3312                 wdev_iter = &sdata_iter->wdev;
3313 
3314                 if (sdata_iter == sdata ||
3315                     !ieee80211_sdata_running(sdata_iter) ||
3316                     local->hw.wiphy->software_iftypes & BIT(wdev_iter->iftype))
3317                         continue;
3318 
3319                 num[wdev_iter->iftype]++;
3320                 total++;
3321         }
3322 
3323         if (total == 1 && !radar_detect)
3324                 return 0;
3325 
3326         return cfg80211_check_combinations(local->hw.wiphy,
3327                                            num_different_channels,
3328                                            radar_detect, num);
3329 }
3330 
3331 static void
3332 ieee80211_iter_max_chans(const struct ieee80211_iface_combination *c,
3333                          void *data)
3334 {
3335         u32 *max_num_different_channels = data;
3336 
3337         *max_num_different_channels = max(*max_num_different_channels,
3338                                           c->num_different_channels);
3339 }
3340 
3341 int ieee80211_max_num_channels(struct ieee80211_local *local)
3342 {
3343         struct ieee80211_sub_if_data *sdata;
3344         int num[NUM_NL80211_IFTYPES] = {};
3345         struct ieee80211_chanctx *ctx;
3346         int num_different_channels = 0;
3347         u8 radar_detect = 0;
3348         u32 max_num_different_channels = 1;
3349         int err;
3350 
3351         lockdep_assert_held(&local->chanctx_mtx);
3352 
3353         list_for_each_entry(ctx, &local->chanctx_list, list) {
3354                 if (ctx->replace_state == IEEE80211_CHANCTX_WILL_BE_REPLACED)
3355                         continue;
3356 
3357                 num_different_channels++;
3358 
3359                 radar_detect |= ieee80211_chanctx_radar_detect(local, ctx);
3360         }
3361 
3362         list_for_each_entry_rcu(sdata, &local->interfaces, list)
3363                 num[sdata->wdev.iftype]++;
3364 
3365         err = cfg80211_iter_combinations(local->hw.wiphy,
3366                                          num_different_channels, radar_detect,
3367                                          num, ieee80211_iter_max_chans,
3368                                          &max_num_different_channels);
3369         if (err < 0)
3370                 return err;
3371 
3372         return max_num_different_channels;
3373 }
3374 
3375 u8 *ieee80211_add_wmm_info_ie(u8 *buf, u8 qosinfo)
3376 {
3377         *buf++ = WLAN_EID_VENDOR_SPECIFIC;
3378         *buf++ = 7; /* len */
3379         *buf++ = 0x00; /* Microsoft OUI 00:50:F2 */
3380         *buf++ = 0x50;
3381         *buf++ = 0xf2;
3382         *buf++ = 2; /* WME */
3383         *buf++ = 0; /* WME info */
3384         *buf++ = 1; /* WME ver */
3385         *buf++ = qosinfo; /* U-APSD no in use */
3386 
3387         return buf;
3388 }
3389 
3390 void ieee80211_init_tx_queue(struct ieee80211_sub_if_data *sdata,
3391                              struct sta_info *sta,
3392                              struct txq_info *txqi, int tid)
3393 {
3394         skb_queue_head_init(&txqi->queue);
3395         txqi->txq.vif = &sdata->vif;
3396 
3397         if (sta) {
3398                 txqi->txq.sta = &sta->sta;
3399                 sta->sta.txq[tid] = &txqi->txq;
3400                 txqi->txq.tid = tid;
3401                 txqi->txq.ac = ieee802_1d_to_ac[tid & 7];
3402         } else {
3403                 sdata->vif.txq = &txqi->txq;
3404                 txqi->txq.tid = 0;
3405                 txqi->txq.ac = IEEE80211_AC_BE;
3406         }
3407 }
3408 
3409 void ieee80211_txq_get_depth(struct ieee80211_txq *txq,
3410                              unsigned long *frame_cnt,
3411                              unsigned long *byte_cnt)
3412 {
3413         struct txq_info *txqi = to_txq_info(txq);
3414 
3415         if (frame_cnt)
3416                 *frame_cnt = txqi->queue.qlen;
3417 
3418         if (byte_cnt)
3419                 *byte_cnt = txqi->byte_cnt;
3420 }
3421 EXPORT_SYMBOL(ieee80211_txq_get_depth);
3422 

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