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

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

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