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

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  1 /*
  2  * Copyright 2002-2005, Instant802 Networks, Inc.
  3  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
  4  * Copyright 2013-2014  Intel Mobile Communications GmbH
  5  *
  6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License version 2 as
  8  * published by the Free Software Foundation.
  9  */
 10 
 11 #include <linux/module.h>
 12 #include <linux/init.h>
 13 #include <linux/etherdevice.h>
 14 #include <linux/netdevice.h>
 15 #include <linux/types.h>
 16 #include <linux/slab.h>
 17 #include <linux/skbuff.h>
 18 #include <linux/if_arp.h>
 19 #include <linux/timer.h>
 20 #include <linux/rtnetlink.h>
 21 
 22 #include <net/mac80211.h>
 23 #include "ieee80211_i.h"
 24 #include "driver-ops.h"
 25 #include "rate.h"
 26 #include "sta_info.h"
 27 #include "debugfs_sta.h"
 28 #include "mesh.h"
 29 #include "wme.h"
 30 
 31 /**
 32  * DOC: STA information lifetime rules
 33  *
 34  * STA info structures (&struct sta_info) are managed in a hash table
 35  * for faster lookup and a list for iteration. They are managed using
 36  * RCU, i.e. access to the list and hash table is protected by RCU.
 37  *
 38  * Upon allocating a STA info structure with sta_info_alloc(), the caller
 39  * owns that structure. It must then insert it into the hash table using
 40  * either sta_info_insert() or sta_info_insert_rcu(); only in the latter
 41  * case (which acquires an rcu read section but must not be called from
 42  * within one) will the pointer still be valid after the call. Note that
 43  * the caller may not do much with the STA info before inserting it, in
 44  * particular, it may not start any mesh peer link management or add
 45  * encryption keys.
 46  *
 47  * When the insertion fails (sta_info_insert()) returns non-zero), the
 48  * structure will have been freed by sta_info_insert()!
 49  *
 50  * Station entries are added by mac80211 when you establish a link with a
 51  * peer. This means different things for the different type of interfaces
 52  * we support. For a regular station this mean we add the AP sta when we
 53  * receive an association response from the AP. For IBSS this occurs when
 54  * get to know about a peer on the same IBSS. For WDS we add the sta for
 55  * the peer immediately upon device open. When using AP mode we add stations
 56  * for each respective station upon request from userspace through nl80211.
 57  *
 58  * In order to remove a STA info structure, various sta_info_destroy_*()
 59  * calls are available.
 60  *
 61  * There is no concept of ownership on a STA entry, each structure is
 62  * owned by the global hash table/list until it is removed. All users of
 63  * the structure need to be RCU protected so that the structure won't be
 64  * freed before they are done using it.
 65  */
 66 
 67 /* Caller must hold local->sta_mtx */
 68 static int sta_info_hash_del(struct ieee80211_local *local,
 69                              struct sta_info *sta)
 70 {
 71         struct sta_info *s;
 72 
 73         s = rcu_dereference_protected(local->sta_hash[STA_HASH(sta->sta.addr)],
 74                                       lockdep_is_held(&local->sta_mtx));
 75         if (!s)
 76                 return -ENOENT;
 77         if (s == sta) {
 78                 rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)],
 79                                    s->hnext);
 80                 return 0;
 81         }
 82 
 83         while (rcu_access_pointer(s->hnext) &&
 84                rcu_access_pointer(s->hnext) != sta)
 85                 s = rcu_dereference_protected(s->hnext,
 86                                         lockdep_is_held(&local->sta_mtx));
 87         if (rcu_access_pointer(s->hnext)) {
 88                 rcu_assign_pointer(s->hnext, sta->hnext);
 89                 return 0;
 90         }
 91 
 92         return -ENOENT;
 93 }
 94 
 95 static void __cleanup_single_sta(struct sta_info *sta)
 96 {
 97         int ac, i;
 98         struct tid_ampdu_tx *tid_tx;
 99         struct ieee80211_sub_if_data *sdata = sta->sdata;
100         struct ieee80211_local *local = sdata->local;
101         struct ps_data *ps;
102 
103         if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
104             test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
105             test_sta_flag(sta, WLAN_STA_PS_DELIVER)) {
106                 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
107                     sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
108                         ps = &sdata->bss->ps;
109                 else if (ieee80211_vif_is_mesh(&sdata->vif))
110                         ps = &sdata->u.mesh.ps;
111                 else
112                         return;
113 
114                 clear_sta_flag(sta, WLAN_STA_PS_STA);
115                 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
116                 clear_sta_flag(sta, WLAN_STA_PS_DELIVER);
117 
118                 atomic_dec(&ps->num_sta_ps);
119         }
120 
121         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
122                 local->total_ps_buffered -= skb_queue_len(&sta->ps_tx_buf[ac]);
123                 ieee80211_purge_tx_queue(&local->hw, &sta->ps_tx_buf[ac]);
124                 ieee80211_purge_tx_queue(&local->hw, &sta->tx_filtered[ac]);
125         }
126 
127         if (ieee80211_vif_is_mesh(&sdata->vif))
128                 mesh_sta_cleanup(sta);
129 
130         cancel_work_sync(&sta->drv_deliver_wk);
131 
132         /*
133          * Destroy aggregation state here. It would be nice to wait for the
134          * driver to finish aggregation stop and then clean up, but for now
135          * drivers have to handle aggregation stop being requested, followed
136          * directly by station destruction.
137          */
138         for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
139                 kfree(sta->ampdu_mlme.tid_start_tx[i]);
140                 tid_tx = rcu_dereference_raw(sta->ampdu_mlme.tid_tx[i]);
141                 if (!tid_tx)
142                         continue;
143                 ieee80211_purge_tx_queue(&local->hw, &tid_tx->pending);
144                 kfree(tid_tx);
145         }
146 }
147 
148 static void cleanup_single_sta(struct sta_info *sta)
149 {
150         struct ieee80211_sub_if_data *sdata = sta->sdata;
151         struct ieee80211_local *local = sdata->local;
152 
153         __cleanup_single_sta(sta);
154         sta_info_free(local, sta);
155 }
156 
157 /* protected by RCU */
158 struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata,
159                               const u8 *addr)
160 {
161         struct ieee80211_local *local = sdata->local;
162         struct sta_info *sta;
163 
164         sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)],
165                                     lockdep_is_held(&local->sta_mtx));
166         while (sta) {
167                 if (sta->sdata == sdata &&
168                     ether_addr_equal(sta->sta.addr, addr))
169                         break;
170                 sta = rcu_dereference_check(sta->hnext,
171                                             lockdep_is_held(&local->sta_mtx));
172         }
173         return sta;
174 }
175 
176 /*
177  * Get sta info either from the specified interface
178  * or from one of its vlans
179  */
180 struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata,
181                                   const u8 *addr)
182 {
183         struct ieee80211_local *local = sdata->local;
184         struct sta_info *sta;
185 
186         sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)],
187                                     lockdep_is_held(&local->sta_mtx));
188         while (sta) {
189                 if ((sta->sdata == sdata ||
190                      (sta->sdata->bss && sta->sdata->bss == sdata->bss)) &&
191                     ether_addr_equal(sta->sta.addr, addr))
192                         break;
193                 sta = rcu_dereference_check(sta->hnext,
194                                             lockdep_is_held(&local->sta_mtx));
195         }
196         return sta;
197 }
198 
199 struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
200                                      int idx)
201 {
202         struct ieee80211_local *local = sdata->local;
203         struct sta_info *sta;
204         int i = 0;
205 
206         list_for_each_entry_rcu(sta, &local->sta_list, list) {
207                 if (sdata != sta->sdata)
208                         continue;
209                 if (i < idx) {
210                         ++i;
211                         continue;
212                 }
213                 return sta;
214         }
215 
216         return NULL;
217 }
218 
219 /**
220  * sta_info_free - free STA
221  *
222  * @local: pointer to the global information
223  * @sta: STA info to free
224  *
225  * This function must undo everything done by sta_info_alloc()
226  * that may happen before sta_info_insert(). It may only be
227  * called when sta_info_insert() has not been attempted (and
228  * if that fails, the station is freed anyway.)
229  */
230 void sta_info_free(struct ieee80211_local *local, struct sta_info *sta)
231 {
232         int i;
233 
234         if (sta->rate_ctrl)
235                 rate_control_free_sta(sta);
236 
237         if (sta->tx_lat) {
238                 for (i = 0; i < IEEE80211_NUM_TIDS; i++)
239                         kfree(sta->tx_lat[i].bins);
240                 kfree(sta->tx_lat);
241         }
242 
243         sta_dbg(sta->sdata, "Destroyed STA %pM\n", sta->sta.addr);
244 
245         kfree(rcu_dereference_raw(sta->sta.rates));
246         kfree(sta);
247 }
248 
249 /* Caller must hold local->sta_mtx */
250 static void sta_info_hash_add(struct ieee80211_local *local,
251                               struct sta_info *sta)
252 {
253         lockdep_assert_held(&local->sta_mtx);
254         sta->hnext = local->sta_hash[STA_HASH(sta->sta.addr)];
255         rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)], sta);
256 }
257 
258 static void sta_deliver_ps_frames(struct work_struct *wk)
259 {
260         struct sta_info *sta;
261 
262         sta = container_of(wk, struct sta_info, drv_deliver_wk);
263 
264         if (sta->dead)
265                 return;
266 
267         local_bh_disable();
268         if (!test_sta_flag(sta, WLAN_STA_PS_STA))
269                 ieee80211_sta_ps_deliver_wakeup(sta);
270         else if (test_and_clear_sta_flag(sta, WLAN_STA_PSPOLL))
271                 ieee80211_sta_ps_deliver_poll_response(sta);
272         else if (test_and_clear_sta_flag(sta, WLAN_STA_UAPSD))
273                 ieee80211_sta_ps_deliver_uapsd(sta);
274         local_bh_enable();
275 }
276 
277 static int sta_prepare_rate_control(struct ieee80211_local *local,
278                                     struct sta_info *sta, gfp_t gfp)
279 {
280         if (local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)
281                 return 0;
282 
283         sta->rate_ctrl = local->rate_ctrl;
284         sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl,
285                                                      &sta->sta, gfp);
286         if (!sta->rate_ctrl_priv)
287                 return -ENOMEM;
288 
289         return 0;
290 }
291 
292 struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
293                                 const u8 *addr, gfp_t gfp)
294 {
295         struct ieee80211_local *local = sdata->local;
296         struct sta_info *sta;
297         struct timespec uptime;
298         struct ieee80211_tx_latency_bin_ranges *tx_latency;
299         int i;
300 
301         sta = kzalloc(sizeof(*sta) + local->hw.sta_data_size, gfp);
302         if (!sta)
303                 return NULL;
304 
305         rcu_read_lock();
306         tx_latency = rcu_dereference(local->tx_latency);
307         /* init stations Tx latency statistics && TID bins */
308         if (tx_latency) {
309                 sta->tx_lat = kzalloc(IEEE80211_NUM_TIDS *
310                                       sizeof(struct ieee80211_tx_latency_stat),
311                                       GFP_ATOMIC);
312                 if (!sta->tx_lat) {
313                         rcu_read_unlock();
314                         goto free;
315                 }
316 
317                 if (tx_latency->n_ranges) {
318                         for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
319                                 /* size of bins is size of the ranges +1 */
320                                 sta->tx_lat[i].bin_count =
321                                         tx_latency->n_ranges + 1;
322                                 sta->tx_lat[i].bins =
323                                         kcalloc(sta->tx_lat[i].bin_count,
324                                                 sizeof(u32), GFP_ATOMIC);
325                                 if (!sta->tx_lat[i].bins) {
326                                         rcu_read_unlock();
327                                         goto free;
328                                 }
329                         }
330                 }
331         }
332         rcu_read_unlock();
333 
334         spin_lock_init(&sta->lock);
335         spin_lock_init(&sta->ps_lock);
336         INIT_WORK(&sta->drv_deliver_wk, sta_deliver_ps_frames);
337         INIT_WORK(&sta->ampdu_mlme.work, ieee80211_ba_session_work);
338         mutex_init(&sta->ampdu_mlme.mtx);
339 #ifdef CONFIG_MAC80211_MESH
340         if (ieee80211_vif_is_mesh(&sdata->vif) &&
341             !sdata->u.mesh.user_mpm)
342                 init_timer(&sta->plink_timer);
343         sta->nonpeer_pm = NL80211_MESH_POWER_ACTIVE;
344 #endif
345 
346         memcpy(sta->sta.addr, addr, ETH_ALEN);
347         sta->local = local;
348         sta->sdata = sdata;
349         sta->last_rx = jiffies;
350 
351         sta->sta_state = IEEE80211_STA_NONE;
352 
353         /* Mark TID as unreserved */
354         sta->reserved_tid = IEEE80211_TID_UNRESERVED;
355 
356         ktime_get_ts(&uptime);
357         sta->last_connected = uptime.tv_sec;
358         ewma_init(&sta->avg_signal, 1024, 8);
359         for (i = 0; i < ARRAY_SIZE(sta->chain_signal_avg); i++)
360                 ewma_init(&sta->chain_signal_avg[i], 1024, 8);
361 
362         if (sta_prepare_rate_control(local, sta, gfp))
363                 goto free;
364 
365         for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
366                 /*
367                  * timer_to_tid must be initialized with identity mapping
368                  * to enable session_timer's data differentiation. See
369                  * sta_rx_agg_session_timer_expired for usage.
370                  */
371                 sta->timer_to_tid[i] = i;
372         }
373         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
374                 skb_queue_head_init(&sta->ps_tx_buf[i]);
375                 skb_queue_head_init(&sta->tx_filtered[i]);
376         }
377 
378         for (i = 0; i < IEEE80211_NUM_TIDS; i++)
379                 sta->last_seq_ctrl[i] = cpu_to_le16(USHRT_MAX);
380 
381         sta->sta.smps_mode = IEEE80211_SMPS_OFF;
382         if (sdata->vif.type == NL80211_IFTYPE_AP ||
383             sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
384                 struct ieee80211_supported_band *sband =
385                         local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
386                 u8 smps = (sband->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >>
387                                 IEEE80211_HT_CAP_SM_PS_SHIFT;
388                 /*
389                  * Assume that hostapd advertises our caps in the beacon and
390                  * this is the known_smps_mode for a station that just assciated
391                  */
392                 switch (smps) {
393                 case WLAN_HT_SMPS_CONTROL_DISABLED:
394                         sta->known_smps_mode = IEEE80211_SMPS_OFF;
395                         break;
396                 case WLAN_HT_SMPS_CONTROL_STATIC:
397                         sta->known_smps_mode = IEEE80211_SMPS_STATIC;
398                         break;
399                 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
400                         sta->known_smps_mode = IEEE80211_SMPS_DYNAMIC;
401                         break;
402                 default:
403                         WARN_ON(1);
404                 }
405         }
406 
407         sta_dbg(sdata, "Allocated STA %pM\n", sta->sta.addr);
408         return sta;
409 
410 free:
411         if (sta->tx_lat) {
412                 for (i = 0; i < IEEE80211_NUM_TIDS; i++)
413                         kfree(sta->tx_lat[i].bins);
414                 kfree(sta->tx_lat);
415         }
416         kfree(sta);
417         return NULL;
418 }
419 
420 static int sta_info_insert_check(struct sta_info *sta)
421 {
422         struct ieee80211_sub_if_data *sdata = sta->sdata;
423 
424         /*
425          * Can't be a WARN_ON because it can be triggered through a race:
426          * something inserts a STA (on one CPU) without holding the RTNL
427          * and another CPU turns off the net device.
428          */
429         if (unlikely(!ieee80211_sdata_running(sdata)))
430                 return -ENETDOWN;
431 
432         if (WARN_ON(ether_addr_equal(sta->sta.addr, sdata->vif.addr) ||
433                     is_multicast_ether_addr(sta->sta.addr)))
434                 return -EINVAL;
435 
436         return 0;
437 }
438 
439 static int sta_info_insert_drv_state(struct ieee80211_local *local,
440                                      struct ieee80211_sub_if_data *sdata,
441                                      struct sta_info *sta)
442 {
443         enum ieee80211_sta_state state;
444         int err = 0;
445 
446         for (state = IEEE80211_STA_NOTEXIST; state < sta->sta_state; state++) {
447                 err = drv_sta_state(local, sdata, sta, state, state + 1);
448                 if (err)
449                         break;
450         }
451 
452         if (!err) {
453                 /*
454                  * Drivers using legacy sta_add/sta_remove callbacks only
455                  * get uploaded set to true after sta_add is called.
456                  */
457                 if (!local->ops->sta_add)
458                         sta->uploaded = true;
459                 return 0;
460         }
461 
462         if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
463                 sdata_info(sdata,
464                            "failed to move IBSS STA %pM to state %d (%d) - keeping it anyway\n",
465                            sta->sta.addr, state + 1, err);
466                 err = 0;
467         }
468 
469         /* unwind on error */
470         for (; state > IEEE80211_STA_NOTEXIST; state--)
471                 WARN_ON(drv_sta_state(local, sdata, sta, state, state - 1));
472 
473         return err;
474 }
475 
476 /*
477  * should be called with sta_mtx locked
478  * this function replaces the mutex lock
479  * with a RCU lock
480  */
481 static int sta_info_insert_finish(struct sta_info *sta) __acquires(RCU)
482 {
483         struct ieee80211_local *local = sta->local;
484         struct ieee80211_sub_if_data *sdata = sta->sdata;
485         struct station_info sinfo;
486         int err = 0;
487 
488         lockdep_assert_held(&local->sta_mtx);
489 
490         /* check if STA exists already */
491         if (sta_info_get_bss(sdata, sta->sta.addr)) {
492                 err = -EEXIST;
493                 goto out_err;
494         }
495 
496         local->num_sta++;
497         local->sta_generation++;
498         smp_mb();
499 
500         /* simplify things and don't accept BA sessions yet */
501         set_sta_flag(sta, WLAN_STA_BLOCK_BA);
502 
503         /* make the station visible */
504         sta_info_hash_add(local, sta);
505 
506         list_add_tail_rcu(&sta->list, &local->sta_list);
507 
508         /* notify driver */
509         err = sta_info_insert_drv_state(local, sdata, sta);
510         if (err)
511                 goto out_remove;
512 
513         set_sta_flag(sta, WLAN_STA_INSERTED);
514         /* accept BA sessions now */
515         clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
516 
517         ieee80211_recalc_min_chandef(sdata);
518         ieee80211_sta_debugfs_add(sta);
519         rate_control_add_sta_debugfs(sta);
520 
521         memset(&sinfo, 0, sizeof(sinfo));
522         sinfo.filled = 0;
523         sinfo.generation = local->sta_generation;
524         cfg80211_new_sta(sdata->dev, sta->sta.addr, &sinfo, GFP_KERNEL);
525 
526         sta_dbg(sdata, "Inserted STA %pM\n", sta->sta.addr);
527 
528         /* move reference to rcu-protected */
529         rcu_read_lock();
530         mutex_unlock(&local->sta_mtx);
531 
532         if (ieee80211_vif_is_mesh(&sdata->vif))
533                 mesh_accept_plinks_update(sdata);
534 
535         return 0;
536  out_remove:
537         sta_info_hash_del(local, sta);
538         list_del_rcu(&sta->list);
539         local->num_sta--;
540         synchronize_net();
541         __cleanup_single_sta(sta);
542  out_err:
543         mutex_unlock(&local->sta_mtx);
544         rcu_read_lock();
545         return err;
546 }
547 
548 int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU)
549 {
550         struct ieee80211_local *local = sta->local;
551         int err;
552 
553         might_sleep();
554 
555         err = sta_info_insert_check(sta);
556         if (err) {
557                 rcu_read_lock();
558                 goto out_free;
559         }
560 
561         mutex_lock(&local->sta_mtx);
562 
563         err = sta_info_insert_finish(sta);
564         if (err)
565                 goto out_free;
566 
567         return 0;
568  out_free:
569         sta_info_free(local, sta);
570         return err;
571 }
572 
573 int sta_info_insert(struct sta_info *sta)
574 {
575         int err = sta_info_insert_rcu(sta);
576 
577         rcu_read_unlock();
578 
579         return err;
580 }
581 
582 static inline void __bss_tim_set(u8 *tim, u16 id)
583 {
584         /*
585          * This format has been mandated by the IEEE specifications,
586          * so this line may not be changed to use the __set_bit() format.
587          */
588         tim[id / 8] |= (1 << (id % 8));
589 }
590 
591 static inline void __bss_tim_clear(u8 *tim, u16 id)
592 {
593         /*
594          * This format has been mandated by the IEEE specifications,
595          * so this line may not be changed to use the __clear_bit() format.
596          */
597         tim[id / 8] &= ~(1 << (id % 8));
598 }
599 
600 static inline bool __bss_tim_get(u8 *tim, u16 id)
601 {
602         /*
603          * This format has been mandated by the IEEE specifications,
604          * so this line may not be changed to use the test_bit() format.
605          */
606         return tim[id / 8] & (1 << (id % 8));
607 }
608 
609 static unsigned long ieee80211_tids_for_ac(int ac)
610 {
611         /* If we ever support TIDs > 7, this obviously needs to be adjusted */
612         switch (ac) {
613         case IEEE80211_AC_VO:
614                 return BIT(6) | BIT(7);
615         case IEEE80211_AC_VI:
616                 return BIT(4) | BIT(5);
617         case IEEE80211_AC_BE:
618                 return BIT(0) | BIT(3);
619         case IEEE80211_AC_BK:
620                 return BIT(1) | BIT(2);
621         default:
622                 WARN_ON(1);
623                 return 0;
624         }
625 }
626 
627 static void __sta_info_recalc_tim(struct sta_info *sta, bool ignore_pending)
628 {
629         struct ieee80211_local *local = sta->local;
630         struct ps_data *ps;
631         bool indicate_tim = false;
632         u8 ignore_for_tim = sta->sta.uapsd_queues;
633         int ac;
634         u16 id;
635 
636         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
637             sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
638                 if (WARN_ON_ONCE(!sta->sdata->bss))
639                         return;
640 
641                 ps = &sta->sdata->bss->ps;
642                 id = sta->sta.aid;
643 #ifdef CONFIG_MAC80211_MESH
644         } else if (ieee80211_vif_is_mesh(&sta->sdata->vif)) {
645                 ps = &sta->sdata->u.mesh.ps;
646                 /* TIM map only for 1 <= PLID <= IEEE80211_MAX_AID */
647                 id = sta->plid % (IEEE80211_MAX_AID + 1);
648 #endif
649         } else {
650                 return;
651         }
652 
653         /* No need to do anything if the driver does all */
654         if (local->hw.flags & IEEE80211_HW_AP_LINK_PS)
655                 return;
656 
657         if (sta->dead)
658                 goto done;
659 
660         /*
661          * If all ACs are delivery-enabled then we should build
662          * the TIM bit for all ACs anyway; if only some are then
663          * we ignore those and build the TIM bit using only the
664          * non-enabled ones.
665          */
666         if (ignore_for_tim == BIT(IEEE80211_NUM_ACS) - 1)
667                 ignore_for_tim = 0;
668 
669         if (ignore_pending)
670                 ignore_for_tim = BIT(IEEE80211_NUM_ACS) - 1;
671 
672         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
673                 unsigned long tids;
674 
675                 if (ignore_for_tim & BIT(ac))
676                         continue;
677 
678                 indicate_tim |= !skb_queue_empty(&sta->tx_filtered[ac]) ||
679                                 !skb_queue_empty(&sta->ps_tx_buf[ac]);
680                 if (indicate_tim)
681                         break;
682 
683                 tids = ieee80211_tids_for_ac(ac);
684 
685                 indicate_tim |=
686                         sta->driver_buffered_tids & tids;
687         }
688 
689  done:
690         spin_lock_bh(&local->tim_lock);
691 
692         if (indicate_tim == __bss_tim_get(ps->tim, id))
693                 goto out_unlock;
694 
695         if (indicate_tim)
696                 __bss_tim_set(ps->tim, id);
697         else
698                 __bss_tim_clear(ps->tim, id);
699 
700         if (local->ops->set_tim && !WARN_ON(sta->dead)) {
701                 local->tim_in_locked_section = true;
702                 drv_set_tim(local, &sta->sta, indicate_tim);
703                 local->tim_in_locked_section = false;
704         }
705 
706 out_unlock:
707         spin_unlock_bh(&local->tim_lock);
708 }
709 
710 void sta_info_recalc_tim(struct sta_info *sta)
711 {
712         __sta_info_recalc_tim(sta, false);
713 }
714 
715 static bool sta_info_buffer_expired(struct sta_info *sta, struct sk_buff *skb)
716 {
717         struct ieee80211_tx_info *info;
718         int timeout;
719 
720         if (!skb)
721                 return false;
722 
723         info = IEEE80211_SKB_CB(skb);
724 
725         /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
726         timeout = (sta->listen_interval *
727                    sta->sdata->vif.bss_conf.beacon_int *
728                    32 / 15625) * HZ;
729         if (timeout < STA_TX_BUFFER_EXPIRE)
730                 timeout = STA_TX_BUFFER_EXPIRE;
731         return time_after(jiffies, info->control.jiffies + timeout);
732 }
733 
734 
735 static bool sta_info_cleanup_expire_buffered_ac(struct ieee80211_local *local,
736                                                 struct sta_info *sta, int ac)
737 {
738         unsigned long flags;
739         struct sk_buff *skb;
740 
741         /*
742          * First check for frames that should expire on the filtered
743          * queue. Frames here were rejected by the driver and are on
744          * a separate queue to avoid reordering with normal PS-buffered
745          * frames. They also aren't accounted for right now in the
746          * total_ps_buffered counter.
747          */
748         for (;;) {
749                 spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
750                 skb = skb_peek(&sta->tx_filtered[ac]);
751                 if (sta_info_buffer_expired(sta, skb))
752                         skb = __skb_dequeue(&sta->tx_filtered[ac]);
753                 else
754                         skb = NULL;
755                 spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
756 
757                 /*
758                  * Frames are queued in order, so if this one
759                  * hasn't expired yet we can stop testing. If
760                  * we actually reached the end of the queue we
761                  * also need to stop, of course.
762                  */
763                 if (!skb)
764                         break;
765                 ieee80211_free_txskb(&local->hw, skb);
766         }
767 
768         /*
769          * Now also check the normal PS-buffered queue, this will
770          * only find something if the filtered queue was emptied
771          * since the filtered frames are all before the normal PS
772          * buffered frames.
773          */
774         for (;;) {
775                 spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
776                 skb = skb_peek(&sta->ps_tx_buf[ac]);
777                 if (sta_info_buffer_expired(sta, skb))
778                         skb = __skb_dequeue(&sta->ps_tx_buf[ac]);
779                 else
780                         skb = NULL;
781                 spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
782 
783                 /*
784                  * frames are queued in order, so if this one
785                  * hasn't expired yet (or we reached the end of
786                  * the queue) we can stop testing
787                  */
788                 if (!skb)
789                         break;
790 
791                 local->total_ps_buffered--;
792                 ps_dbg(sta->sdata, "Buffered frame expired (STA %pM)\n",
793                        sta->sta.addr);
794                 ieee80211_free_txskb(&local->hw, skb);
795         }
796 
797         /*
798          * Finally, recalculate the TIM bit for this station -- it might
799          * now be clear because the station was too slow to retrieve its
800          * frames.
801          */
802         sta_info_recalc_tim(sta);
803 
804         /*
805          * Return whether there are any frames still buffered, this is
806          * used to check whether the cleanup timer still needs to run,
807          * if there are no frames we don't need to rearm the timer.
808          */
809         return !(skb_queue_empty(&sta->ps_tx_buf[ac]) &&
810                  skb_queue_empty(&sta->tx_filtered[ac]));
811 }
812 
813 static bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
814                                              struct sta_info *sta)
815 {
816         bool have_buffered = false;
817         int ac;
818 
819         /* This is only necessary for stations on BSS/MBSS interfaces */
820         if (!sta->sdata->bss &&
821             !ieee80211_vif_is_mesh(&sta->sdata->vif))
822                 return false;
823 
824         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
825                 have_buffered |=
826                         sta_info_cleanup_expire_buffered_ac(local, sta, ac);
827 
828         return have_buffered;
829 }
830 
831 static int __must_check __sta_info_destroy_part1(struct sta_info *sta)
832 {
833         struct ieee80211_local *local;
834         struct ieee80211_sub_if_data *sdata;
835         int ret;
836 
837         might_sleep();
838 
839         if (!sta)
840                 return -ENOENT;
841 
842         local = sta->local;
843         sdata = sta->sdata;
844 
845         lockdep_assert_held(&local->sta_mtx);
846 
847         /*
848          * Before removing the station from the driver and
849          * rate control, it might still start new aggregation
850          * sessions -- block that to make sure the tear-down
851          * will be sufficient.
852          */
853         set_sta_flag(sta, WLAN_STA_BLOCK_BA);
854         ieee80211_sta_tear_down_BA_sessions(sta, AGG_STOP_DESTROY_STA);
855 
856         ret = sta_info_hash_del(local, sta);
857         if (WARN_ON(ret))
858                 return ret;
859 
860         /*
861          * for TDLS peers, make sure to return to the base channel before
862          * removal.
863          */
864         if (test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) {
865                 drv_tdls_cancel_channel_switch(local, sdata, &sta->sta);
866                 clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
867         }
868 
869         list_del_rcu(&sta->list);
870 
871         drv_sta_pre_rcu_remove(local, sta->sdata, sta);
872 
873         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
874             rcu_access_pointer(sdata->u.vlan.sta) == sta)
875                 RCU_INIT_POINTER(sdata->u.vlan.sta, NULL);
876 
877         return 0;
878 }
879 
880 static void __sta_info_destroy_part2(struct sta_info *sta)
881 {
882         struct ieee80211_local *local = sta->local;
883         struct ieee80211_sub_if_data *sdata = sta->sdata;
884         struct station_info sinfo = {};
885         int ret;
886 
887         /*
888          * NOTE: This assumes at least synchronize_net() was done
889          *       after _part1 and before _part2!
890          */
891 
892         might_sleep();
893         lockdep_assert_held(&local->sta_mtx);
894 
895         /* now keys can no longer be reached */
896         ieee80211_free_sta_keys(local, sta);
897 
898         /* disable TIM bit - last chance to tell driver */
899         __sta_info_recalc_tim(sta, true);
900 
901         sta->dead = true;
902 
903         local->num_sta--;
904         local->sta_generation++;
905 
906         while (sta->sta_state > IEEE80211_STA_NONE) {
907                 ret = sta_info_move_state(sta, sta->sta_state - 1);
908                 if (ret) {
909                         WARN_ON_ONCE(1);
910                         break;
911                 }
912         }
913 
914         if (sta->uploaded) {
915                 ret = drv_sta_state(local, sdata, sta, IEEE80211_STA_NONE,
916                                     IEEE80211_STA_NOTEXIST);
917                 WARN_ON_ONCE(ret != 0);
918         }
919 
920         sta_dbg(sdata, "Removed STA %pM\n", sta->sta.addr);
921 
922         sta_set_sinfo(sta, &sinfo);
923         cfg80211_del_sta_sinfo(sdata->dev, sta->sta.addr, &sinfo, GFP_KERNEL);
924 
925         rate_control_remove_sta_debugfs(sta);
926         ieee80211_sta_debugfs_remove(sta);
927         ieee80211_recalc_min_chandef(sdata);
928 
929         cleanup_single_sta(sta);
930 }
931 
932 int __must_check __sta_info_destroy(struct sta_info *sta)
933 {
934         int err = __sta_info_destroy_part1(sta);
935 
936         if (err)
937                 return err;
938 
939         synchronize_net();
940 
941         __sta_info_destroy_part2(sta);
942 
943         return 0;
944 }
945 
946 int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, const u8 *addr)
947 {
948         struct sta_info *sta;
949         int ret;
950 
951         mutex_lock(&sdata->local->sta_mtx);
952         sta = sta_info_get(sdata, addr);
953         ret = __sta_info_destroy(sta);
954         mutex_unlock(&sdata->local->sta_mtx);
955 
956         return ret;
957 }
958 
959 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
960                               const u8 *addr)
961 {
962         struct sta_info *sta;
963         int ret;
964 
965         mutex_lock(&sdata->local->sta_mtx);
966         sta = sta_info_get_bss(sdata, addr);
967         ret = __sta_info_destroy(sta);
968         mutex_unlock(&sdata->local->sta_mtx);
969 
970         return ret;
971 }
972 
973 static void sta_info_cleanup(unsigned long data)
974 {
975         struct ieee80211_local *local = (struct ieee80211_local *) data;
976         struct sta_info *sta;
977         bool timer_needed = false;
978 
979         rcu_read_lock();
980         list_for_each_entry_rcu(sta, &local->sta_list, list)
981                 if (sta_info_cleanup_expire_buffered(local, sta))
982                         timer_needed = true;
983         rcu_read_unlock();
984 
985         if (local->quiescing)
986                 return;
987 
988         if (!timer_needed)
989                 return;
990 
991         mod_timer(&local->sta_cleanup,
992                   round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL));
993 }
994 
995 void sta_info_init(struct ieee80211_local *local)
996 {
997         spin_lock_init(&local->tim_lock);
998         mutex_init(&local->sta_mtx);
999         INIT_LIST_HEAD(&local->sta_list);
1000 
1001         setup_timer(&local->sta_cleanup, sta_info_cleanup,
1002                     (unsigned long)local);
1003 }
1004 
1005 void sta_info_stop(struct ieee80211_local *local)
1006 {
1007         del_timer_sync(&local->sta_cleanup);
1008 }
1009 
1010 
1011 int __sta_info_flush(struct ieee80211_sub_if_data *sdata, bool vlans)
1012 {
1013         struct ieee80211_local *local = sdata->local;
1014         struct sta_info *sta, *tmp;
1015         LIST_HEAD(free_list);
1016         int ret = 0;
1017 
1018         might_sleep();
1019 
1020         WARN_ON(vlans && sdata->vif.type != NL80211_IFTYPE_AP);
1021         WARN_ON(vlans && !sdata->bss);
1022 
1023         mutex_lock(&local->sta_mtx);
1024         list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1025                 if (sdata == sta->sdata ||
1026                     (vlans && sdata->bss == sta->sdata->bss)) {
1027                         if (!WARN_ON(__sta_info_destroy_part1(sta)))
1028                                 list_add(&sta->free_list, &free_list);
1029                         ret++;
1030                 }
1031         }
1032 
1033         if (!list_empty(&free_list)) {
1034                 synchronize_net();
1035                 list_for_each_entry_safe(sta, tmp, &free_list, free_list)
1036                         __sta_info_destroy_part2(sta);
1037         }
1038         mutex_unlock(&local->sta_mtx);
1039 
1040         return ret;
1041 }
1042 
1043 void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
1044                           unsigned long exp_time)
1045 {
1046         struct ieee80211_local *local = sdata->local;
1047         struct sta_info *sta, *tmp;
1048 
1049         mutex_lock(&local->sta_mtx);
1050 
1051         list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1052                 if (sdata != sta->sdata)
1053                         continue;
1054 
1055                 if (time_after(jiffies, sta->last_rx + exp_time)) {
1056                         sta_dbg(sta->sdata, "expiring inactive STA %pM\n",
1057                                 sta->sta.addr);
1058 
1059                         if (ieee80211_vif_is_mesh(&sdata->vif) &&
1060                             test_sta_flag(sta, WLAN_STA_PS_STA))
1061                                 atomic_dec(&sdata->u.mesh.ps.num_sta_ps);
1062 
1063                         WARN_ON(__sta_info_destroy(sta));
1064                 }
1065         }
1066 
1067         mutex_unlock(&local->sta_mtx);
1068 }
1069 
1070 struct ieee80211_sta *ieee80211_find_sta_by_ifaddr(struct ieee80211_hw *hw,
1071                                                const u8 *addr,
1072                                                const u8 *localaddr)
1073 {
1074         struct sta_info *sta, *nxt;
1075 
1076         /*
1077          * Just return a random station if localaddr is NULL
1078          * ... first in list.
1079          */
1080         for_each_sta_info(hw_to_local(hw), addr, sta, nxt) {
1081                 if (localaddr &&
1082                     !ether_addr_equal(sta->sdata->vif.addr, localaddr))
1083                         continue;
1084                 if (!sta->uploaded)
1085                         return NULL;
1086                 return &sta->sta;
1087         }
1088 
1089         return NULL;
1090 }
1091 EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr);
1092 
1093 struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif,
1094                                          const u8 *addr)
1095 {
1096         struct sta_info *sta;
1097 
1098         if (!vif)
1099                 return NULL;
1100 
1101         sta = sta_info_get_bss(vif_to_sdata(vif), addr);
1102         if (!sta)
1103                 return NULL;
1104 
1105         if (!sta->uploaded)
1106                 return NULL;
1107 
1108         return &sta->sta;
1109 }
1110 EXPORT_SYMBOL(ieee80211_find_sta);
1111 
1112 /* powersave support code */
1113 void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta)
1114 {
1115         struct ieee80211_sub_if_data *sdata = sta->sdata;
1116         struct ieee80211_local *local = sdata->local;
1117         struct sk_buff_head pending;
1118         int filtered = 0, buffered = 0, ac;
1119         unsigned long flags;
1120         struct ps_data *ps;
1121 
1122         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1123                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
1124                                      u.ap);
1125 
1126         if (sdata->vif.type == NL80211_IFTYPE_AP)
1127                 ps = &sdata->bss->ps;
1128         else if (ieee80211_vif_is_mesh(&sdata->vif))
1129                 ps = &sdata->u.mesh.ps;
1130         else
1131                 return;
1132 
1133         clear_sta_flag(sta, WLAN_STA_SP);
1134 
1135         BUILD_BUG_ON(BITS_TO_LONGS(IEEE80211_NUM_TIDS) > 1);
1136         sta->driver_buffered_tids = 0;
1137 
1138         if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1139                 drv_sta_notify(local, sdata, STA_NOTIFY_AWAKE, &sta->sta);
1140 
1141         skb_queue_head_init(&pending);
1142 
1143         /* sync with ieee80211_tx_h_unicast_ps_buf */
1144         spin_lock(&sta->ps_lock);
1145         /* Send all buffered frames to the station */
1146         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1147                 int count = skb_queue_len(&pending), tmp;
1148 
1149                 spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
1150                 skb_queue_splice_tail_init(&sta->tx_filtered[ac], &pending);
1151                 spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
1152                 tmp = skb_queue_len(&pending);
1153                 filtered += tmp - count;
1154                 count = tmp;
1155 
1156                 spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
1157                 skb_queue_splice_tail_init(&sta->ps_tx_buf[ac], &pending);
1158                 spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
1159                 tmp = skb_queue_len(&pending);
1160                 buffered += tmp - count;
1161         }
1162 
1163         ieee80211_add_pending_skbs(local, &pending);
1164 
1165         /* now we're no longer in the deliver code */
1166         clear_sta_flag(sta, WLAN_STA_PS_DELIVER);
1167 
1168         /* The station might have polled and then woken up before we responded,
1169          * so clear these flags now to avoid them sticking around.
1170          */
1171         clear_sta_flag(sta, WLAN_STA_PSPOLL);
1172         clear_sta_flag(sta, WLAN_STA_UAPSD);
1173         spin_unlock(&sta->ps_lock);
1174 
1175         atomic_dec(&ps->num_sta_ps);
1176 
1177         /* This station just woke up and isn't aware of our SMPS state */
1178         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
1179             !ieee80211_smps_is_restrictive(sta->known_smps_mode,
1180                                            sdata->smps_mode) &&
1181             sta->known_smps_mode != sdata->bss->req_smps &&
1182             sta_info_tx_streams(sta) != 1) {
1183                 ht_dbg(sdata,
1184                        "%pM just woke up and MIMO capable - update SMPS\n",
1185                        sta->sta.addr);
1186                 ieee80211_send_smps_action(sdata, sdata->bss->req_smps,
1187                                            sta->sta.addr,
1188                                            sdata->vif.bss_conf.bssid);
1189         }
1190 
1191         local->total_ps_buffered -= buffered;
1192 
1193         sta_info_recalc_tim(sta);
1194 
1195         ps_dbg(sdata,
1196                "STA %pM aid %d sending %d filtered/%d PS frames since STA not sleeping anymore\n",
1197                sta->sta.addr, sta->sta.aid, filtered, buffered);
1198 }
1199 
1200 static void ieee80211_send_null_response(struct ieee80211_sub_if_data *sdata,
1201                                          struct sta_info *sta, int tid,
1202                                          enum ieee80211_frame_release_type reason,
1203                                          bool call_driver)
1204 {
1205         struct ieee80211_local *local = sdata->local;
1206         struct ieee80211_qos_hdr *nullfunc;
1207         struct sk_buff *skb;
1208         int size = sizeof(*nullfunc);
1209         __le16 fc;
1210         bool qos = sta->sta.wme;
1211         struct ieee80211_tx_info *info;
1212         struct ieee80211_chanctx_conf *chanctx_conf;
1213 
1214         if (qos) {
1215                 fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1216                                  IEEE80211_STYPE_QOS_NULLFUNC |
1217                                  IEEE80211_FCTL_FROMDS);
1218         } else {
1219                 size -= 2;
1220                 fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1221                                  IEEE80211_STYPE_NULLFUNC |
1222                                  IEEE80211_FCTL_FROMDS);
1223         }
1224 
1225         skb = dev_alloc_skb(local->hw.extra_tx_headroom + size);
1226         if (!skb)
1227                 return;
1228 
1229         skb_reserve(skb, local->hw.extra_tx_headroom);
1230 
1231         nullfunc = (void *) skb_put(skb, size);
1232         nullfunc->frame_control = fc;
1233         nullfunc->duration_id = 0;
1234         memcpy(nullfunc->addr1, sta->sta.addr, ETH_ALEN);
1235         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
1236         memcpy(nullfunc->addr3, sdata->vif.addr, ETH_ALEN);
1237         nullfunc->seq_ctrl = 0;
1238 
1239         skb->priority = tid;
1240         skb_set_queue_mapping(skb, ieee802_1d_to_ac[tid]);
1241         if (qos) {
1242                 nullfunc->qos_ctrl = cpu_to_le16(tid);
1243 
1244                 if (reason == IEEE80211_FRAME_RELEASE_UAPSD)
1245                         nullfunc->qos_ctrl |=
1246                                 cpu_to_le16(IEEE80211_QOS_CTL_EOSP);
1247         }
1248 
1249         info = IEEE80211_SKB_CB(skb);
1250 
1251         /*
1252          * Tell TX path to send this frame even though the
1253          * STA may still remain is PS mode after this frame
1254          * exchange. Also set EOSP to indicate this packet
1255          * ends the poll/service period.
1256          */
1257         info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER |
1258                        IEEE80211_TX_STATUS_EOSP |
1259                        IEEE80211_TX_CTL_REQ_TX_STATUS;
1260 
1261         info->control.flags |= IEEE80211_TX_CTRL_PS_RESPONSE;
1262 
1263         if (call_driver)
1264                 drv_allow_buffered_frames(local, sta, BIT(tid), 1,
1265                                           reason, false);
1266 
1267         skb->dev = sdata->dev;
1268 
1269         rcu_read_lock();
1270         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1271         if (WARN_ON(!chanctx_conf)) {
1272                 rcu_read_unlock();
1273                 kfree_skb(skb);
1274                 return;
1275         }
1276 
1277         info->band = chanctx_conf->def.chan->band;
1278         ieee80211_xmit(sdata, skb);
1279         rcu_read_unlock();
1280 }
1281 
1282 static int find_highest_prio_tid(unsigned long tids)
1283 {
1284         /* lower 3 TIDs aren't ordered perfectly */
1285         if (tids & 0xF8)
1286                 return fls(tids) - 1;
1287         /* TID 0 is BE just like TID 3 */
1288         if (tids & BIT(0))
1289                 return 0;
1290         return fls(tids) - 1;
1291 }
1292 
1293 static void
1294 ieee80211_sta_ps_deliver_response(struct sta_info *sta,
1295                                   int n_frames, u8 ignored_acs,
1296                                   enum ieee80211_frame_release_type reason)
1297 {
1298         struct ieee80211_sub_if_data *sdata = sta->sdata;
1299         struct ieee80211_local *local = sdata->local;
1300         bool more_data = false;
1301         int ac;
1302         unsigned long driver_release_tids = 0;
1303         struct sk_buff_head frames;
1304 
1305         /* Service or PS-Poll period starts */
1306         set_sta_flag(sta, WLAN_STA_SP);
1307 
1308         __skb_queue_head_init(&frames);
1309 
1310         /* Get response frame(s) and more data bit for the last one. */
1311         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1312                 unsigned long tids;
1313 
1314                 if (ignored_acs & BIT(ac))
1315                         continue;
1316 
1317                 tids = ieee80211_tids_for_ac(ac);
1318 
1319                 /* if we already have frames from software, then we can't also
1320                  * release from hardware queues
1321                  */
1322                 if (skb_queue_empty(&frames))
1323                         driver_release_tids |= sta->driver_buffered_tids & tids;
1324 
1325                 if (driver_release_tids) {
1326                         /* If the driver has data on more than one TID then
1327                          * certainly there's more data if we release just a
1328                          * single frame now (from a single TID). This will
1329                          * only happen for PS-Poll.
1330                          */
1331                         if (reason == IEEE80211_FRAME_RELEASE_PSPOLL &&
1332                             hweight16(driver_release_tids) > 1) {
1333                                 more_data = true;
1334                                 driver_release_tids =
1335                                         BIT(find_highest_prio_tid(
1336                                                 driver_release_tids));
1337                                 break;
1338                         }
1339                 } else {
1340                         struct sk_buff *skb;
1341 
1342                         while (n_frames > 0) {
1343                                 skb = skb_dequeue(&sta->tx_filtered[ac]);
1344                                 if (!skb) {
1345                                         skb = skb_dequeue(
1346                                                 &sta->ps_tx_buf[ac]);
1347                                         if (skb)
1348                                                 local->total_ps_buffered--;
1349                                 }
1350                                 if (!skb)
1351                                         break;
1352                                 n_frames--;
1353                                 __skb_queue_tail(&frames, skb);
1354                         }
1355                 }
1356 
1357                 /* If we have more frames buffered on this AC, then set the
1358                  * more-data bit and abort the loop since we can't send more
1359                  * data from other ACs before the buffered frames from this.
1360                  */
1361                 if (!skb_queue_empty(&sta->tx_filtered[ac]) ||
1362                     !skb_queue_empty(&sta->ps_tx_buf[ac])) {
1363                         more_data = true;
1364                         break;
1365                 }
1366         }
1367 
1368         if (skb_queue_empty(&frames) && !driver_release_tids) {
1369                 int tid;
1370 
1371                 /*
1372                  * For PS-Poll, this can only happen due to a race condition
1373                  * when we set the TIM bit and the station notices it, but
1374                  * before it can poll for the frame we expire it.
1375                  *
1376                  * For uAPSD, this is said in the standard (11.2.1.5 h):
1377                  *      At each unscheduled SP for a non-AP STA, the AP shall
1378                  *      attempt to transmit at least one MSDU or MMPDU, but no
1379                  *      more than the value specified in the Max SP Length field
1380                  *      in the QoS Capability element from delivery-enabled ACs,
1381                  *      that are destined for the non-AP STA.
1382                  *
1383                  * Since we have no other MSDU/MMPDU, transmit a QoS null frame.
1384                  */
1385 
1386                 /* This will evaluate to 1, 3, 5 or 7. */
1387                 tid = 7 - ((ffs(~ignored_acs) - 1) << 1);
1388 
1389                 ieee80211_send_null_response(sdata, sta, tid, reason, true);
1390         } else if (!driver_release_tids) {
1391                 struct sk_buff_head pending;
1392                 struct sk_buff *skb;
1393                 int num = 0;
1394                 u16 tids = 0;
1395                 bool need_null = false;
1396 
1397                 skb_queue_head_init(&pending);
1398 
1399                 while ((skb = __skb_dequeue(&frames))) {
1400                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1401                         struct ieee80211_hdr *hdr = (void *) skb->data;
1402                         u8 *qoshdr = NULL;
1403 
1404                         num++;
1405 
1406                         /*
1407                          * Tell TX path to send this frame even though the
1408                          * STA may still remain is PS mode after this frame
1409                          * exchange.
1410                          */
1411                         info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
1412                         info->control.flags |= IEEE80211_TX_CTRL_PS_RESPONSE;
1413 
1414                         /*
1415                          * Use MoreData flag to indicate whether there are
1416                          * more buffered frames for this STA
1417                          */
1418                         if (more_data || !skb_queue_empty(&frames))
1419                                 hdr->frame_control |=
1420                                         cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1421                         else
1422                                 hdr->frame_control &=
1423                                         cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
1424 
1425                         if (ieee80211_is_data_qos(hdr->frame_control) ||
1426                             ieee80211_is_qos_nullfunc(hdr->frame_control))
1427                                 qoshdr = ieee80211_get_qos_ctl(hdr);
1428 
1429                         tids |= BIT(skb->priority);
1430 
1431                         __skb_queue_tail(&pending, skb);
1432 
1433                         /* end service period after last frame or add one */
1434                         if (!skb_queue_empty(&frames))
1435                                 continue;
1436 
1437                         if (reason != IEEE80211_FRAME_RELEASE_UAPSD) {
1438                                 /* for PS-Poll, there's only one frame */
1439                                 info->flags |= IEEE80211_TX_STATUS_EOSP |
1440                                                IEEE80211_TX_CTL_REQ_TX_STATUS;
1441                                 break;
1442                         }
1443 
1444                         /* For uAPSD, things are a bit more complicated. If the
1445                          * last frame has a QoS header (i.e. is a QoS-data or
1446                          * QoS-nulldata frame) then just set the EOSP bit there
1447                          * and be done.
1448                          * If the frame doesn't have a QoS header (which means
1449                          * it should be a bufferable MMPDU) then we can't set
1450                          * the EOSP bit in the QoS header; add a QoS-nulldata
1451                          * frame to the list to send it after the MMPDU.
1452                          *
1453                          * Note that this code is only in the mac80211-release
1454                          * code path, we assume that the driver will not buffer
1455                          * anything but QoS-data frames, or if it does, will
1456                          * create the QoS-nulldata frame by itself if needed.
1457                          *
1458                          * Cf. 802.11-2012 10.2.1.10 (c).
1459                          */
1460                         if (qoshdr) {
1461                                 *qoshdr |= IEEE80211_QOS_CTL_EOSP;
1462 
1463                                 info->flags |= IEEE80211_TX_STATUS_EOSP |
1464                                                IEEE80211_TX_CTL_REQ_TX_STATUS;
1465                         } else {
1466                                 /* The standard isn't completely clear on this
1467                                  * as it says the more-data bit should be set
1468                                  * if there are more BUs. The QoS-Null frame
1469                                  * we're about to send isn't buffered yet, we
1470                                  * only create it below, but let's pretend it
1471                                  * was buffered just in case some clients only
1472                                  * expect more-data=0 when eosp=1.
1473                                  */
1474                                 hdr->frame_control |=
1475                                         cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1476                                 need_null = true;
1477                                 num++;
1478                         }
1479                         break;
1480                 }
1481 
1482                 drv_allow_buffered_frames(local, sta, tids, num,
1483                                           reason, more_data);
1484 
1485                 ieee80211_add_pending_skbs(local, &pending);
1486 
1487                 if (need_null)
1488                         ieee80211_send_null_response(
1489                                 sdata, sta, find_highest_prio_tid(tids),
1490                                 reason, false);
1491 
1492                 sta_info_recalc_tim(sta);
1493         } else {
1494                 /*
1495                  * We need to release a frame that is buffered somewhere in the
1496                  * driver ... it'll have to handle that.
1497                  * Note that the driver also has to check the number of frames
1498                  * on the TIDs we're releasing from - if there are more than
1499                  * n_frames it has to set the more-data bit (if we didn't ask
1500                  * it to set it anyway due to other buffered frames); if there
1501                  * are fewer than n_frames it has to make sure to adjust that
1502                  * to allow the service period to end properly.
1503                  */
1504                 drv_release_buffered_frames(local, sta, driver_release_tids,
1505                                             n_frames, reason, more_data);
1506 
1507                 /*
1508                  * Note that we don't recalculate the TIM bit here as it would
1509                  * most likely have no effect at all unless the driver told us
1510                  * that the TID(s) became empty before returning here from the
1511                  * release function.
1512                  * Either way, however, when the driver tells us that the TID(s)
1513                  * became empty we'll do the TIM recalculation.
1514                  */
1515         }
1516 }
1517 
1518 void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta)
1519 {
1520         u8 ignore_for_response = sta->sta.uapsd_queues;
1521 
1522         /*
1523          * If all ACs are delivery-enabled then we should reply
1524          * from any of them, if only some are enabled we reply
1525          * only from the non-enabled ones.
1526          */
1527         if (ignore_for_response == BIT(IEEE80211_NUM_ACS) - 1)
1528                 ignore_for_response = 0;
1529 
1530         ieee80211_sta_ps_deliver_response(sta, 1, ignore_for_response,
1531                                           IEEE80211_FRAME_RELEASE_PSPOLL);
1532 }
1533 
1534 void ieee80211_sta_ps_deliver_uapsd(struct sta_info *sta)
1535 {
1536         int n_frames = sta->sta.max_sp;
1537         u8 delivery_enabled = sta->sta.uapsd_queues;
1538 
1539         /*
1540          * If we ever grow support for TSPEC this might happen if
1541          * the TSPEC update from hostapd comes in between a trigger
1542          * frame setting WLAN_STA_UAPSD in the RX path and this
1543          * actually getting called.
1544          */
1545         if (!delivery_enabled)
1546                 return;
1547 
1548         switch (sta->sta.max_sp) {
1549         case 1:
1550                 n_frames = 2;
1551                 break;
1552         case 2:
1553                 n_frames = 4;
1554                 break;
1555         case 3:
1556                 n_frames = 6;
1557                 break;
1558         case 0:
1559                 /* XXX: what is a good value? */
1560                 n_frames = 128;
1561                 break;
1562         }
1563 
1564         ieee80211_sta_ps_deliver_response(sta, n_frames, ~delivery_enabled,
1565                                           IEEE80211_FRAME_RELEASE_UAPSD);
1566 }
1567 
1568 void ieee80211_sta_block_awake(struct ieee80211_hw *hw,
1569                                struct ieee80211_sta *pubsta, bool block)
1570 {
1571         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1572 
1573         trace_api_sta_block_awake(sta->local, pubsta, block);
1574 
1575         if (block) {
1576                 set_sta_flag(sta, WLAN_STA_PS_DRIVER);
1577                 return;
1578         }
1579 
1580         if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1581                 return;
1582 
1583         if (!test_sta_flag(sta, WLAN_STA_PS_STA)) {
1584                 set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1585                 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
1586                 ieee80211_queue_work(hw, &sta->drv_deliver_wk);
1587         } else if (test_sta_flag(sta, WLAN_STA_PSPOLL) ||
1588                    test_sta_flag(sta, WLAN_STA_UAPSD)) {
1589                 /* must be asleep in this case */
1590                 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
1591                 ieee80211_queue_work(hw, &sta->drv_deliver_wk);
1592         } else {
1593                 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
1594         }
1595 }
1596 EXPORT_SYMBOL(ieee80211_sta_block_awake);
1597 
1598 void ieee80211_sta_eosp(struct ieee80211_sta *pubsta)
1599 {
1600         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1601         struct ieee80211_local *local = sta->local;
1602 
1603         trace_api_eosp(local, pubsta);
1604 
1605         clear_sta_flag(sta, WLAN_STA_SP);
1606 }
1607 EXPORT_SYMBOL(ieee80211_sta_eosp);
1608 
1609 void ieee80211_sta_set_buffered(struct ieee80211_sta *pubsta,
1610                                 u8 tid, bool buffered)
1611 {
1612         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1613 
1614         if (WARN_ON(tid >= IEEE80211_NUM_TIDS))
1615                 return;
1616 
1617         trace_api_sta_set_buffered(sta->local, pubsta, tid, buffered);
1618 
1619         if (buffered)
1620                 set_bit(tid, &sta->driver_buffered_tids);
1621         else
1622                 clear_bit(tid, &sta->driver_buffered_tids);
1623 
1624         sta_info_recalc_tim(sta);
1625 }
1626 EXPORT_SYMBOL(ieee80211_sta_set_buffered);
1627 
1628 int sta_info_move_state(struct sta_info *sta,
1629                         enum ieee80211_sta_state new_state)
1630 {
1631         might_sleep();
1632 
1633         if (sta->sta_state == new_state)
1634                 return 0;
1635 
1636         /* check allowed transitions first */
1637 
1638         switch (new_state) {
1639         case IEEE80211_STA_NONE:
1640                 if (sta->sta_state != IEEE80211_STA_AUTH)
1641                         return -EINVAL;
1642                 break;
1643         case IEEE80211_STA_AUTH:
1644                 if (sta->sta_state != IEEE80211_STA_NONE &&
1645                     sta->sta_state != IEEE80211_STA_ASSOC)
1646                         return -EINVAL;
1647                 break;
1648         case IEEE80211_STA_ASSOC:
1649                 if (sta->sta_state != IEEE80211_STA_AUTH &&
1650                     sta->sta_state != IEEE80211_STA_AUTHORIZED)
1651                         return -EINVAL;
1652                 break;
1653         case IEEE80211_STA_AUTHORIZED:
1654                 if (sta->sta_state != IEEE80211_STA_ASSOC)
1655                         return -EINVAL;
1656                 break;
1657         default:
1658                 WARN(1, "invalid state %d", new_state);
1659                 return -EINVAL;
1660         }
1661 
1662         sta_dbg(sta->sdata, "moving STA %pM to state %d\n",
1663                 sta->sta.addr, new_state);
1664 
1665         /*
1666          * notify the driver before the actual changes so it can
1667          * fail the transition
1668          */
1669         if (test_sta_flag(sta, WLAN_STA_INSERTED)) {
1670                 int err = drv_sta_state(sta->local, sta->sdata, sta,
1671                                         sta->sta_state, new_state);
1672                 if (err)
1673                         return err;
1674         }
1675 
1676         /* reflect the change in all state variables */
1677 
1678         switch (new_state) {
1679         case IEEE80211_STA_NONE:
1680                 if (sta->sta_state == IEEE80211_STA_AUTH)
1681                         clear_bit(WLAN_STA_AUTH, &sta->_flags);
1682                 break;
1683         case IEEE80211_STA_AUTH:
1684                 if (sta->sta_state == IEEE80211_STA_NONE)
1685                         set_bit(WLAN_STA_AUTH, &sta->_flags);
1686                 else if (sta->sta_state == IEEE80211_STA_ASSOC)
1687                         clear_bit(WLAN_STA_ASSOC, &sta->_flags);
1688                 break;
1689         case IEEE80211_STA_ASSOC:
1690                 if (sta->sta_state == IEEE80211_STA_AUTH) {
1691                         set_bit(WLAN_STA_ASSOC, &sta->_flags);
1692                 } else if (sta->sta_state == IEEE80211_STA_AUTHORIZED) {
1693                         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1694                             (sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1695                              !sta->sdata->u.vlan.sta))
1696                                 atomic_dec(&sta->sdata->bss->num_mcast_sta);
1697                         clear_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
1698                 }
1699                 break;
1700         case IEEE80211_STA_AUTHORIZED:
1701                 if (sta->sta_state == IEEE80211_STA_ASSOC) {
1702                         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1703                             (sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1704                              !sta->sdata->u.vlan.sta))
1705                                 atomic_inc(&sta->sdata->bss->num_mcast_sta);
1706                         set_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
1707                 }
1708                 break;
1709         default:
1710                 break;
1711         }
1712 
1713         sta->sta_state = new_state;
1714 
1715         return 0;
1716 }
1717 
1718 u8 sta_info_tx_streams(struct sta_info *sta)
1719 {
1720         struct ieee80211_sta_ht_cap *ht_cap = &sta->sta.ht_cap;
1721         u8 rx_streams;
1722 
1723         if (!sta->sta.ht_cap.ht_supported)
1724                 return 1;
1725 
1726         if (sta->sta.vht_cap.vht_supported) {
1727                 int i;
1728                 u16 tx_mcs_map =
1729                         le16_to_cpu(sta->sta.vht_cap.vht_mcs.tx_mcs_map);
1730 
1731                 for (i = 7; i >= 0; i--)
1732                         if ((tx_mcs_map & (0x3 << (i * 2))) !=
1733                             IEEE80211_VHT_MCS_NOT_SUPPORTED)
1734                                 return i + 1;
1735         }
1736 
1737         if (ht_cap->mcs.rx_mask[3])
1738                 rx_streams = 4;
1739         else if (ht_cap->mcs.rx_mask[2])
1740                 rx_streams = 3;
1741         else if (ht_cap->mcs.rx_mask[1])
1742                 rx_streams = 2;
1743         else
1744                 rx_streams = 1;
1745 
1746         if (!(ht_cap->mcs.tx_params & IEEE80211_HT_MCS_TX_RX_DIFF))
1747                 return rx_streams;
1748 
1749         return ((ht_cap->mcs.tx_params & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
1750                         >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1;
1751 }
1752 
1753 void sta_set_sinfo(struct sta_info *sta, struct station_info *sinfo)
1754 {
1755         struct ieee80211_sub_if_data *sdata = sta->sdata;
1756         struct ieee80211_local *local = sdata->local;
1757         struct rate_control_ref *ref = NULL;
1758         struct timespec uptime;
1759         u32 thr = 0;
1760         int i, ac;
1761 
1762         if (test_sta_flag(sta, WLAN_STA_RATE_CONTROL))
1763                 ref = local->rate_ctrl;
1764 
1765         sinfo->generation = sdata->local->sta_generation;
1766 
1767         /* do before driver, so beacon filtering drivers have a
1768          * chance to e.g. just add the number of filtered beacons
1769          * (or just modify the value entirely, of course)
1770          */
1771         if (sdata->vif.type == NL80211_IFTYPE_STATION)
1772                 sinfo->rx_beacon = sdata->u.mgd.count_beacon_signal;
1773 
1774         drv_sta_statistics(local, sdata, &sta->sta, sinfo);
1775 
1776         sinfo->filled |= BIT(NL80211_STA_INFO_INACTIVE_TIME) |
1777                          BIT(NL80211_STA_INFO_STA_FLAGS) |
1778                          BIT(NL80211_STA_INFO_BSS_PARAM) |
1779                          BIT(NL80211_STA_INFO_CONNECTED_TIME) |
1780                          BIT(NL80211_STA_INFO_RX_DROP_MISC) |
1781                          BIT(NL80211_STA_INFO_BEACON_LOSS);
1782 
1783         ktime_get_ts(&uptime);
1784         sinfo->connected_time = uptime.tv_sec - sta->last_connected;
1785         sinfo->inactive_time = jiffies_to_msecs(jiffies - sta->last_rx);
1786 
1787         if (!(sinfo->filled & (BIT(NL80211_STA_INFO_TX_BYTES64) |
1788                                BIT(NL80211_STA_INFO_TX_BYTES)))) {
1789                 sinfo->tx_bytes = 0;
1790                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
1791                         sinfo->tx_bytes += sta->tx_bytes[ac];
1792                 sinfo->filled |= BIT(NL80211_STA_INFO_TX_BYTES64);
1793         }
1794 
1795         if (!(sinfo->filled & BIT(NL80211_STA_INFO_TX_PACKETS))) {
1796                 sinfo->tx_packets = 0;
1797                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
1798                         sinfo->tx_packets += sta->tx_packets[ac];
1799                 sinfo->filled |= BIT(NL80211_STA_INFO_TX_PACKETS);
1800         }
1801 
1802         if (!(sinfo->filled & (BIT(NL80211_STA_INFO_RX_BYTES64) |
1803                                BIT(NL80211_STA_INFO_RX_BYTES)))) {
1804                 sinfo->rx_bytes = sta->rx_bytes;
1805                 sinfo->filled |= BIT(NL80211_STA_INFO_RX_BYTES64);
1806         }
1807 
1808         if (!(sinfo->filled & BIT(NL80211_STA_INFO_RX_PACKETS))) {
1809                 sinfo->rx_packets = sta->rx_packets;
1810                 sinfo->filled |= BIT(NL80211_STA_INFO_RX_PACKETS);
1811         }
1812 
1813         if (!(sinfo->filled & BIT(NL80211_STA_INFO_TX_RETRIES))) {
1814                 sinfo->tx_retries = sta->tx_retry_count;
1815                 sinfo->filled |= BIT(NL80211_STA_INFO_TX_RETRIES);
1816         }
1817 
1818         if (!(sinfo->filled & BIT(NL80211_STA_INFO_TX_FAILED))) {
1819                 sinfo->tx_failed = sta->tx_retry_failed;
1820                 sinfo->filled |= BIT(NL80211_STA_INFO_TX_FAILED);
1821         }
1822 
1823         sinfo->rx_dropped_misc = sta->rx_dropped;
1824         sinfo->beacon_loss_count = sta->beacon_loss_count;
1825 
1826         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1827             !(sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)) {
1828                 sinfo->filled |= BIT(NL80211_STA_INFO_BEACON_RX) |
1829                                  BIT(NL80211_STA_INFO_BEACON_SIGNAL_AVG);
1830                 sinfo->rx_beacon_signal_avg = ieee80211_ave_rssi(&sdata->vif);
1831         }
1832 
1833         if ((sta->local->hw.flags & IEEE80211_HW_SIGNAL_DBM) ||
1834             (sta->local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)) {
1835                 if (!(sinfo->filled & BIT(NL80211_STA_INFO_SIGNAL))) {
1836                         sinfo->signal = (s8)sta->last_signal;
1837                         sinfo->filled |= BIT(NL80211_STA_INFO_SIGNAL);
1838                 }
1839 
1840                 if (!(sinfo->filled & BIT(NL80211_STA_INFO_SIGNAL_AVG))) {
1841                         sinfo->signal_avg = (s8) -ewma_read(&sta->avg_signal);
1842                         sinfo->filled |= BIT(NL80211_STA_INFO_SIGNAL_AVG);
1843                 }
1844         }
1845 
1846         if (sta->chains &&
1847             !(sinfo->filled & (BIT(NL80211_STA_INFO_CHAIN_SIGNAL) |
1848                                BIT(NL80211_STA_INFO_CHAIN_SIGNAL_AVG)))) {
1849                 sinfo->filled |= BIT(NL80211_STA_INFO_CHAIN_SIGNAL) |
1850                                  BIT(NL80211_STA_INFO_CHAIN_SIGNAL_AVG);
1851 
1852                 sinfo->chains = sta->chains;
1853                 for (i = 0; i < ARRAY_SIZE(sinfo->chain_signal); i++) {
1854                         sinfo->chain_signal[i] = sta->chain_signal_last[i];
1855                         sinfo->chain_signal_avg[i] =
1856                                 (s8) -ewma_read(&sta->chain_signal_avg[i]);
1857                 }
1858         }
1859 
1860         if (!(sinfo->filled & BIT(NL80211_STA_INFO_TX_BITRATE))) {
1861                 sta_set_rate_info_tx(sta, &sta->last_tx_rate, &sinfo->txrate);
1862                 sinfo->filled |= BIT(NL80211_STA_INFO_TX_BITRATE);
1863         }
1864 
1865         if (!(sinfo->filled & BIT(NL80211_STA_INFO_RX_BITRATE))) {
1866                 sta_set_rate_info_rx(sta, &sinfo->rxrate);
1867                 sinfo->filled |= BIT(NL80211_STA_INFO_RX_BITRATE);
1868         }
1869 
1870         sinfo->filled |= BIT(NL80211_STA_INFO_TID_STATS);
1871         for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) {
1872                 struct cfg80211_tid_stats *tidstats = &sinfo->pertid[i];
1873 
1874                 if (!(tidstats->filled & BIT(NL80211_TID_STATS_RX_MSDU))) {
1875                         tidstats->filled |= BIT(NL80211_TID_STATS_RX_MSDU);
1876                         tidstats->rx_msdu = sta->rx_msdu[i];
1877                 }
1878 
1879                 if (!(tidstats->filled & BIT(NL80211_TID_STATS_TX_MSDU))) {
1880                         tidstats->filled |= BIT(NL80211_TID_STATS_TX_MSDU);
1881                         tidstats->tx_msdu = sta->tx_msdu[i];
1882                 }
1883 
1884                 if (!(tidstats->filled &
1885                                 BIT(NL80211_TID_STATS_TX_MSDU_RETRIES)) &&
1886                     local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1887                         tidstats->filled |=
1888                                 BIT(NL80211_TID_STATS_TX_MSDU_RETRIES);
1889                         tidstats->tx_msdu_retries = sta->tx_msdu_retries[i];
1890                 }
1891 
1892                 if (!(tidstats->filled &
1893                                 BIT(NL80211_TID_STATS_TX_MSDU_FAILED)) &&
1894                     local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1895                         tidstats->filled |=
1896                                 BIT(NL80211_TID_STATS_TX_MSDU_FAILED);
1897                         tidstats->tx_msdu_failed = sta->tx_msdu_failed[i];
1898                 }
1899         }
1900 
1901         if (ieee80211_vif_is_mesh(&sdata->vif)) {
1902 #ifdef CONFIG_MAC80211_MESH
1903                 sinfo->filled |= BIT(NL80211_STA_INFO_LLID) |
1904                                  BIT(NL80211_STA_INFO_PLID) |
1905                                  BIT(NL80211_STA_INFO_PLINK_STATE) |
1906                                  BIT(NL80211_STA_INFO_LOCAL_PM) |
1907                                  BIT(NL80211_STA_INFO_PEER_PM) |
1908                                  BIT(NL80211_STA_INFO_NONPEER_PM);
1909 
1910                 sinfo->llid = sta->llid;
1911                 sinfo->plid = sta->plid;
1912                 sinfo->plink_state = sta->plink_state;
1913                 if (test_sta_flag(sta, WLAN_STA_TOFFSET_KNOWN)) {
1914                         sinfo->filled |= BIT(NL80211_STA_INFO_T_OFFSET);
1915                         sinfo->t_offset = sta->t_offset;
1916                 }
1917                 sinfo->local_pm = sta->local_pm;
1918                 sinfo->peer_pm = sta->peer_pm;
1919                 sinfo->nonpeer_pm = sta->nonpeer_pm;
1920 #endif
1921         }
1922 
1923         sinfo->bss_param.flags = 0;
1924         if (sdata->vif.bss_conf.use_cts_prot)
1925                 sinfo->bss_param.flags |= BSS_PARAM_FLAGS_CTS_PROT;
1926         if (sdata->vif.bss_conf.use_short_preamble)
1927                 sinfo->bss_param.flags |= BSS_PARAM_FLAGS_SHORT_PREAMBLE;
1928         if (sdata->vif.bss_conf.use_short_slot)
1929                 sinfo->bss_param.flags |= BSS_PARAM_FLAGS_SHORT_SLOT_TIME;
1930         sinfo->bss_param.dtim_period = sdata->vif.bss_conf.dtim_period;
1931         sinfo->bss_param.beacon_interval = sdata->vif.bss_conf.beacon_int;
1932 
1933         sinfo->sta_flags.set = 0;
1934         sinfo->sta_flags.mask = BIT(NL80211_STA_FLAG_AUTHORIZED) |
1935                                 BIT(NL80211_STA_FLAG_SHORT_PREAMBLE) |
1936                                 BIT(NL80211_STA_FLAG_WME) |
1937                                 BIT(NL80211_STA_FLAG_MFP) |
1938                                 BIT(NL80211_STA_FLAG_AUTHENTICATED) |
1939                                 BIT(NL80211_STA_FLAG_ASSOCIATED) |
1940                                 BIT(NL80211_STA_FLAG_TDLS_PEER);
1941         if (test_sta_flag(sta, WLAN_STA_AUTHORIZED))
1942                 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_AUTHORIZED);
1943         if (test_sta_flag(sta, WLAN_STA_SHORT_PREAMBLE))
1944                 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_SHORT_PREAMBLE);
1945         if (sta->sta.wme)
1946                 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_WME);
1947         if (test_sta_flag(sta, WLAN_STA_MFP))
1948                 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_MFP);
1949         if (test_sta_flag(sta, WLAN_STA_AUTH))
1950                 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_AUTHENTICATED);
1951         if (test_sta_flag(sta, WLAN_STA_ASSOC))
1952                 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_ASSOCIATED);
1953         if (test_sta_flag(sta, WLAN_STA_TDLS_PEER))
1954                 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_TDLS_PEER);
1955 
1956         /* check if the driver has a SW RC implementation */
1957         if (ref && ref->ops->get_expected_throughput)
1958                 thr = ref->ops->get_expected_throughput(sta->rate_ctrl_priv);
1959         else
1960                 thr = drv_get_expected_throughput(local, &sta->sta);
1961 
1962         if (thr != 0) {
1963                 sinfo->filled |= BIT(NL80211_STA_INFO_EXPECTED_THROUGHPUT);
1964                 sinfo->expected_throughput = thr;
1965         }
1966 }
1967 

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