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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 static const struct rhashtable_params sta_rht_params = {
 68         .nelem_hint = 3, /* start small */
 69         .automatic_shrinking = true,
 70         .head_offset = offsetof(struct sta_info, hash_node),
 71         .key_offset = offsetof(struct sta_info, addr),
 72         .key_len = ETH_ALEN,
 73         .hashfn = sta_addr_hash,
 74         .max_size = CONFIG_MAC80211_STA_HASH_MAX_SIZE,
 75 };
 76 
 77 /* Caller must hold local->sta_mtx */
 78 static int sta_info_hash_del(struct ieee80211_local *local,
 79                              struct sta_info *sta)
 80 {
 81         return rhashtable_remove_fast(&local->sta_hash, &sta->hash_node,
 82                                       sta_rht_params);
 83 }
 84 
 85 static void __cleanup_single_sta(struct sta_info *sta)
 86 {
 87         int ac, i;
 88         struct tid_ampdu_tx *tid_tx;
 89         struct ieee80211_sub_if_data *sdata = sta->sdata;
 90         struct ieee80211_local *local = sdata->local;
 91         struct ps_data *ps;
 92 
 93         if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
 94             test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
 95             test_sta_flag(sta, WLAN_STA_PS_DELIVER)) {
 96                 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
 97                     sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 98                         ps = &sdata->bss->ps;
 99                 else if (ieee80211_vif_is_mesh(&sdata->vif))
100                         ps = &sdata->u.mesh.ps;
101                 else
102                         return;
103 
104                 clear_sta_flag(sta, WLAN_STA_PS_STA);
105                 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
106                 clear_sta_flag(sta, WLAN_STA_PS_DELIVER);
107 
108                 atomic_dec(&ps->num_sta_ps);
109         }
110 
111         if (sta->sta.txq[0]) {
112                 for (i = 0; i < ARRAY_SIZE(sta->sta.txq); i++) {
113                         struct txq_info *txqi = to_txq_info(sta->sta.txq[i]);
114                         int n = skb_queue_len(&txqi->queue);
115 
116                         ieee80211_purge_tx_queue(&local->hw, &txqi->queue);
117                         atomic_sub(n, &sdata->txqs_len[txqi->txq.ac]);
118                 }
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         struct rhash_head *tmp;
164         const struct bucket_table *tbl;
165 
166         rcu_read_lock();
167         tbl = rht_dereference_rcu(local->sta_hash.tbl, &local->sta_hash);
168 
169         for_each_sta_info(local, tbl, addr, sta, tmp) {
170                 if (sta->sdata == sdata) {
171                         rcu_read_unlock();
172                         /* this is safe as the caller must already hold
173                          * another rcu read section or the mutex
174                          */
175                         return sta;
176                 }
177         }
178         rcu_read_unlock();
179         return NULL;
180 }
181 
182 /*
183  * Get sta info either from the specified interface
184  * or from one of its vlans
185  */
186 struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata,
187                                   const u8 *addr)
188 {
189         struct ieee80211_local *local = sdata->local;
190         struct sta_info *sta;
191         struct rhash_head *tmp;
192         const struct bucket_table *tbl;
193 
194         rcu_read_lock();
195         tbl = rht_dereference_rcu(local->sta_hash.tbl, &local->sta_hash);
196 
197         for_each_sta_info(local, tbl, addr, sta, tmp) {
198                 if (sta->sdata == sdata ||
199                     (sta->sdata->bss && sta->sdata->bss == sdata->bss)) {
200                         rcu_read_unlock();
201                         /* this is safe as the caller must already hold
202                          * another rcu read section or the mutex
203                          */
204                         return sta;
205                 }
206         }
207         rcu_read_unlock();
208         return NULL;
209 }
210 
211 struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
212                                      int idx)
213 {
214         struct ieee80211_local *local = sdata->local;
215         struct sta_info *sta;
216         int i = 0;
217 
218         list_for_each_entry_rcu(sta, &local->sta_list, list) {
219                 if (sdata != sta->sdata)
220                         continue;
221                 if (i < idx) {
222                         ++i;
223                         continue;
224                 }
225                 return sta;
226         }
227 
228         return NULL;
229 }
230 
231 /**
232  * sta_info_free - free STA
233  *
234  * @local: pointer to the global information
235  * @sta: STA info to free
236  *
237  * This function must undo everything done by sta_info_alloc()
238  * that may happen before sta_info_insert(). It may only be
239  * called when sta_info_insert() has not been attempted (and
240  * if that fails, the station is freed anyway.)
241  */
242 void sta_info_free(struct ieee80211_local *local, struct sta_info *sta)
243 {
244         if (sta->rate_ctrl)
245                 rate_control_free_sta(sta);
246 
247         sta_dbg(sta->sdata, "Destroyed STA %pM\n", sta->sta.addr);
248 
249         if (sta->sta.txq[0])
250                 kfree(to_txq_info(sta->sta.txq[0]));
251         kfree(rcu_dereference_raw(sta->sta.rates));
252 #ifdef CONFIG_MAC80211_MESH
253         kfree(sta->mesh);
254 #endif
255         kfree(sta);
256 }
257 
258 /* Caller must hold local->sta_mtx */
259 static void sta_info_hash_add(struct ieee80211_local *local,
260                               struct sta_info *sta)
261 {
262         rhashtable_insert_fast(&local->sta_hash, &sta->hash_node,
263                                sta_rht_params);
264 }
265 
266 static void sta_deliver_ps_frames(struct work_struct *wk)
267 {
268         struct sta_info *sta;
269 
270         sta = container_of(wk, struct sta_info, drv_deliver_wk);
271 
272         if (sta->dead)
273                 return;
274 
275         local_bh_disable();
276         if (!test_sta_flag(sta, WLAN_STA_PS_STA))
277                 ieee80211_sta_ps_deliver_wakeup(sta);
278         else if (test_and_clear_sta_flag(sta, WLAN_STA_PSPOLL))
279                 ieee80211_sta_ps_deliver_poll_response(sta);
280         else if (test_and_clear_sta_flag(sta, WLAN_STA_UAPSD))
281                 ieee80211_sta_ps_deliver_uapsd(sta);
282         local_bh_enable();
283 }
284 
285 static int sta_prepare_rate_control(struct ieee80211_local *local,
286                                     struct sta_info *sta, gfp_t gfp)
287 {
288         if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL))
289                 return 0;
290 
291         sta->rate_ctrl = local->rate_ctrl;
292         sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl,
293                                                      sta, gfp);
294         if (!sta->rate_ctrl_priv)
295                 return -ENOMEM;
296 
297         return 0;
298 }
299 
300 struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
301                                 const u8 *addr, gfp_t gfp)
302 {
303         struct ieee80211_local *local = sdata->local;
304         struct ieee80211_hw *hw = &local->hw;
305         struct sta_info *sta;
306         struct timespec uptime;
307         int i;
308 
309         sta = kzalloc(sizeof(*sta) + hw->sta_data_size, gfp);
310         if (!sta)
311                 return NULL;
312 
313         spin_lock_init(&sta->lock);
314         spin_lock_init(&sta->ps_lock);
315         INIT_WORK(&sta->drv_deliver_wk, sta_deliver_ps_frames);
316         INIT_WORK(&sta->ampdu_mlme.work, ieee80211_ba_session_work);
317         mutex_init(&sta->ampdu_mlme.mtx);
318 #ifdef CONFIG_MAC80211_MESH
319         if (ieee80211_vif_is_mesh(&sdata->vif)) {
320                 sta->mesh = kzalloc(sizeof(*sta->mesh), gfp);
321                 if (!sta->mesh)
322                         goto free;
323                 spin_lock_init(&sta->mesh->plink_lock);
324                 if (ieee80211_vif_is_mesh(&sdata->vif) &&
325                     !sdata->u.mesh.user_mpm)
326                         init_timer(&sta->mesh->plink_timer);
327                 sta->mesh->nonpeer_pm = NL80211_MESH_POWER_ACTIVE;
328         }
329 #endif
330 
331         memcpy(sta->addr, addr, ETH_ALEN);
332         memcpy(sta->sta.addr, addr, ETH_ALEN);
333         sta->local = local;
334         sta->sdata = sdata;
335         sta->last_rx = jiffies;
336 
337         sta->sta_state = IEEE80211_STA_NONE;
338 
339         /* Mark TID as unreserved */
340         sta->reserved_tid = IEEE80211_TID_UNRESERVED;
341 
342         ktime_get_ts(&uptime);
343         sta->last_connected = uptime.tv_sec;
344         ewma_signal_init(&sta->avg_signal);
345         for (i = 0; i < ARRAY_SIZE(sta->chain_signal_avg); i++)
346                 ewma_signal_init(&sta->chain_signal_avg[i]);
347 
348         if (local->ops->wake_tx_queue) {
349                 void *txq_data;
350                 int size = sizeof(struct txq_info) +
351                            ALIGN(hw->txq_data_size, sizeof(void *));
352 
353                 txq_data = kcalloc(ARRAY_SIZE(sta->sta.txq), size, gfp);
354                 if (!txq_data)
355                         goto free;
356 
357                 for (i = 0; i < ARRAY_SIZE(sta->sta.txq); i++) {
358                         struct txq_info *txq = txq_data + i * size;
359 
360                         ieee80211_init_tx_queue(sdata, sta, txq, i);
361                 }
362         }
363 
364         if (sta_prepare_rate_control(local, sta, gfp))
365                 goto free_txq;
366 
367         for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
368                 /*
369                  * timer_to_tid must be initialized with identity mapping
370                  * to enable session_timer's data differentiation. See
371                  * sta_rx_agg_session_timer_expired for usage.
372                  */
373                 sta->timer_to_tid[i] = i;
374         }
375         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
376                 skb_queue_head_init(&sta->ps_tx_buf[i]);
377                 skb_queue_head_init(&sta->tx_filtered[i]);
378         }
379 
380         for (i = 0; i < IEEE80211_NUM_TIDS; i++)
381                 sta->last_seq_ctrl[i] = cpu_to_le16(USHRT_MAX);
382 
383         sta->sta.smps_mode = IEEE80211_SMPS_OFF;
384         if (sdata->vif.type == NL80211_IFTYPE_AP ||
385             sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
386                 struct ieee80211_supported_band *sband =
387                         hw->wiphy->bands[ieee80211_get_sdata_band(sdata)];
388                 u8 smps = (sband->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >>
389                                 IEEE80211_HT_CAP_SM_PS_SHIFT;
390                 /*
391                  * Assume that hostapd advertises our caps in the beacon and
392                  * this is the known_smps_mode for a station that just assciated
393                  */
394                 switch (smps) {
395                 case WLAN_HT_SMPS_CONTROL_DISABLED:
396                         sta->known_smps_mode = IEEE80211_SMPS_OFF;
397                         break;
398                 case WLAN_HT_SMPS_CONTROL_STATIC:
399                         sta->known_smps_mode = IEEE80211_SMPS_STATIC;
400                         break;
401                 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
402                         sta->known_smps_mode = IEEE80211_SMPS_DYNAMIC;
403                         break;
404                 default:
405                         WARN_ON(1);
406                 }
407         }
408 
409         sta_dbg(sdata, "Allocated STA %pM\n", sta->sta.addr);
410 
411         return sta;
412 
413 free_txq:
414         if (sta->sta.txq[0])
415                 kfree(to_txq_info(sta->sta.txq[0]));
416 free:
417 #ifdef CONFIG_MAC80211_MESH
418         kfree(sta->mesh);
419 #endif
420         kfree(sta);
421         return NULL;
422 }
423 
424 static int sta_info_insert_check(struct sta_info *sta)
425 {
426         struct ieee80211_sub_if_data *sdata = sta->sdata;
427 
428         /*
429          * Can't be a WARN_ON because it can be triggered through a race:
430          * something inserts a STA (on one CPU) without holding the RTNL
431          * and another CPU turns off the net device.
432          */
433         if (unlikely(!ieee80211_sdata_running(sdata)))
434                 return -ENETDOWN;
435 
436         if (WARN_ON(ether_addr_equal(sta->sta.addr, sdata->vif.addr) ||
437                     is_multicast_ether_addr(sta->sta.addr)))
438                 return -EINVAL;
439 
440         return 0;
441 }
442 
443 static int sta_info_insert_drv_state(struct ieee80211_local *local,
444                                      struct ieee80211_sub_if_data *sdata,
445                                      struct sta_info *sta)
446 {
447         enum ieee80211_sta_state state;
448         int err = 0;
449 
450         for (state = IEEE80211_STA_NOTEXIST; state < sta->sta_state; state++) {
451                 err = drv_sta_state(local, sdata, sta, state, state + 1);
452                 if (err)
453                         break;
454         }
455 
456         if (!err) {
457                 /*
458                  * Drivers using legacy sta_add/sta_remove callbacks only
459                  * get uploaded set to true after sta_add is called.
460                  */
461                 if (!local->ops->sta_add)
462                         sta->uploaded = true;
463                 return 0;
464         }
465 
466         if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
467                 sdata_info(sdata,
468                            "failed to move IBSS STA %pM to state %d (%d) - keeping it anyway\n",
469                            sta->sta.addr, state + 1, err);
470                 err = 0;
471         }
472 
473         /* unwind on error */
474         for (; state > IEEE80211_STA_NOTEXIST; state--)
475                 WARN_ON(drv_sta_state(local, sdata, sta, state, state - 1));
476 
477         return err;
478 }
479 
480 /*
481  * should be called with sta_mtx locked
482  * this function replaces the mutex lock
483  * with a RCU lock
484  */
485 static int sta_info_insert_finish(struct sta_info *sta) __acquires(RCU)
486 {
487         struct ieee80211_local *local = sta->local;
488         struct ieee80211_sub_if_data *sdata = sta->sdata;
489         struct station_info sinfo;
490         int err = 0;
491 
492         lockdep_assert_held(&local->sta_mtx);
493 
494         /* check if STA exists already */
495         if (sta_info_get_bss(sdata, sta->sta.addr)) {
496                 err = -EEXIST;
497                 goto out_err;
498         }
499 
500         local->num_sta++;
501         local->sta_generation++;
502         smp_mb();
503 
504         /* simplify things and don't accept BA sessions yet */
505         set_sta_flag(sta, WLAN_STA_BLOCK_BA);
506 
507         /* make the station visible */
508         sta_info_hash_add(local, sta);
509 
510         list_add_tail_rcu(&sta->list, &local->sta_list);
511 
512         /* notify driver */
513         err = sta_info_insert_drv_state(local, sdata, sta);
514         if (err)
515                 goto out_remove;
516 
517         set_sta_flag(sta, WLAN_STA_INSERTED);
518         /* accept BA sessions now */
519         clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
520 
521         ieee80211_recalc_min_chandef(sdata);
522         ieee80211_sta_debugfs_add(sta);
523         rate_control_add_sta_debugfs(sta);
524 
525         memset(&sinfo, 0, sizeof(sinfo));
526         sinfo.filled = 0;
527         sinfo.generation = local->sta_generation;
528         cfg80211_new_sta(sdata->dev, sta->sta.addr, &sinfo, GFP_KERNEL);
529 
530         sta_dbg(sdata, "Inserted STA %pM\n", sta->sta.addr);
531 
532         /* move reference to rcu-protected */
533         rcu_read_lock();
534         mutex_unlock(&local->sta_mtx);
535 
536         if (ieee80211_vif_is_mesh(&sdata->vif))
537                 mesh_accept_plinks_update(sdata);
538 
539         return 0;
540  out_remove:
541         sta_info_hash_del(local, sta);
542         list_del_rcu(&sta->list);
543         local->num_sta--;
544         synchronize_net();
545         __cleanup_single_sta(sta);
546  out_err:
547         mutex_unlock(&local->sta_mtx);
548         rcu_read_lock();
549         return err;
550 }
551 
552 int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU)
553 {
554         struct ieee80211_local *local = sta->local;
555         int err;
556 
557         might_sleep();
558 
559         err = sta_info_insert_check(sta);
560         if (err) {
561                 rcu_read_lock();
562                 goto out_free;
563         }
564 
565         mutex_lock(&local->sta_mtx);
566 
567         err = sta_info_insert_finish(sta);
568         if (err)
569                 goto out_free;
570 
571         return 0;
572  out_free:
573         sta_info_free(local, sta);
574         return err;
575 }
576 
577 int sta_info_insert(struct sta_info *sta)
578 {
579         int err = sta_info_insert_rcu(sta);
580 
581         rcu_read_unlock();
582 
583         return err;
584 }
585 
586 static inline void __bss_tim_set(u8 *tim, u16 id)
587 {
588         /*
589          * This format has been mandated by the IEEE specifications,
590          * so this line may not be changed to use the __set_bit() format.
591          */
592         tim[id / 8] |= (1 << (id % 8));
593 }
594 
595 static inline void __bss_tim_clear(u8 *tim, u16 id)
596 {
597         /*
598          * This format has been mandated by the IEEE specifications,
599          * so this line may not be changed to use the __clear_bit() format.
600          */
601         tim[id / 8] &= ~(1 << (id % 8));
602 }
603 
604 static inline bool __bss_tim_get(u8 *tim, u16 id)
605 {
606         /*
607          * This format has been mandated by the IEEE specifications,
608          * so this line may not be changed to use the test_bit() format.
609          */
610         return tim[id / 8] & (1 << (id % 8));
611 }
612 
613 static unsigned long ieee80211_tids_for_ac(int ac)
614 {
615         /* If we ever support TIDs > 7, this obviously needs to be adjusted */
616         switch (ac) {
617         case IEEE80211_AC_VO:
618                 return BIT(6) | BIT(7);
619         case IEEE80211_AC_VI:
620                 return BIT(4) | BIT(5);
621         case IEEE80211_AC_BE:
622                 return BIT(0) | BIT(3);
623         case IEEE80211_AC_BK:
624                 return BIT(1) | BIT(2);
625         default:
626                 WARN_ON(1);
627                 return 0;
628         }
629 }
630 
631 static void __sta_info_recalc_tim(struct sta_info *sta, bool ignore_pending)
632 {
633         struct ieee80211_local *local = sta->local;
634         struct ps_data *ps;
635         bool indicate_tim = false;
636         u8 ignore_for_tim = sta->sta.uapsd_queues;
637         int ac;
638         u16 id = sta->sta.aid;
639 
640         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
641             sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
642                 if (WARN_ON_ONCE(!sta->sdata->bss))
643                         return;
644 
645                 ps = &sta->sdata->bss->ps;
646 #ifdef CONFIG_MAC80211_MESH
647         } else if (ieee80211_vif_is_mesh(&sta->sdata->vif)) {
648                 ps = &sta->sdata->u.mesh.ps;
649 #endif
650         } else {
651                 return;
652         }
653 
654         /* No need to do anything if the driver does all */
655         if (ieee80211_hw_check(&local->hw, AP_LINK_PS))
656                 return;
657 
658         if (sta->dead)
659                 goto done;
660 
661         /*
662          * If all ACs are delivery-enabled then we should build
663          * the TIM bit for all ACs anyway; if only some are then
664          * we ignore those and build the TIM bit using only the
665          * non-enabled ones.
666          */
667         if (ignore_for_tim == BIT(IEEE80211_NUM_ACS) - 1)
668                 ignore_for_tim = 0;
669 
670         if (ignore_pending)
671                 ignore_for_tim = BIT(IEEE80211_NUM_ACS) - 1;
672 
673         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
674                 unsigned long tids;
675 
676                 if (ignore_for_tim & BIT(ac))
677                         continue;
678 
679                 indicate_tim |= !skb_queue_empty(&sta->tx_filtered[ac]) ||
680                                 !skb_queue_empty(&sta->ps_tx_buf[ac]);
681                 if (indicate_tim)
682                         break;
683 
684                 tids = ieee80211_tids_for_ac(ac);
685 
686                 indicate_tim |=
687                         sta->driver_buffered_tids & tids;
688                 indicate_tim |=
689                         sta->txq_buffered_tids & tids;
690         }
691 
692  done:
693         spin_lock_bh(&local->tim_lock);
694 
695         if (indicate_tim == __bss_tim_get(ps->tim, id))
696                 goto out_unlock;
697 
698         if (indicate_tim)
699                 __bss_tim_set(ps->tim, id);
700         else
701                 __bss_tim_clear(ps->tim, id);
702 
703         if (local->ops->set_tim && !WARN_ON(sta->dead)) {
704                 local->tim_in_locked_section = true;
705                 drv_set_tim(local, &sta->sta, indicate_tim);
706                 local->tim_in_locked_section = false;
707         }
708 
709 out_unlock:
710         spin_unlock_bh(&local->tim_lock);
711 }
712 
713 void sta_info_recalc_tim(struct sta_info *sta)
714 {
715         __sta_info_recalc_tim(sta, false);
716 }
717 
718 static bool sta_info_buffer_expired(struct sta_info *sta, struct sk_buff *skb)
719 {
720         struct ieee80211_tx_info *info;
721         int timeout;
722 
723         if (!skb)
724                 return false;
725 
726         info = IEEE80211_SKB_CB(skb);
727 
728         /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
729         timeout = (sta->listen_interval *
730                    sta->sdata->vif.bss_conf.beacon_int *
731                    32 / 15625) * HZ;
732         if (timeout < STA_TX_BUFFER_EXPIRE)
733                 timeout = STA_TX_BUFFER_EXPIRE;
734         return time_after(jiffies, info->control.jiffies + timeout);
735 }
736 
737 
738 static bool sta_info_cleanup_expire_buffered_ac(struct ieee80211_local *local,
739                                                 struct sta_info *sta, int ac)
740 {
741         unsigned long flags;
742         struct sk_buff *skb;
743 
744         /*
745          * First check for frames that should expire on the filtered
746          * queue. Frames here were rejected by the driver and are on
747          * a separate queue to avoid reordering with normal PS-buffered
748          * frames. They also aren't accounted for right now in the
749          * total_ps_buffered counter.
750          */
751         for (;;) {
752                 spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
753                 skb = skb_peek(&sta->tx_filtered[ac]);
754                 if (sta_info_buffer_expired(sta, skb))
755                         skb = __skb_dequeue(&sta->tx_filtered[ac]);
756                 else
757                         skb = NULL;
758                 spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
759 
760                 /*
761                  * Frames are queued in order, so if this one
762                  * hasn't expired yet we can stop testing. If
763                  * we actually reached the end of the queue we
764                  * also need to stop, of course.
765                  */
766                 if (!skb)
767                         break;
768                 ieee80211_free_txskb(&local->hw, skb);
769         }
770 
771         /*
772          * Now also check the normal PS-buffered queue, this will
773          * only find something if the filtered queue was emptied
774          * since the filtered frames are all before the normal PS
775          * buffered frames.
776          */
777         for (;;) {
778                 spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
779                 skb = skb_peek(&sta->ps_tx_buf[ac]);
780                 if (sta_info_buffer_expired(sta, skb))
781                         skb = __skb_dequeue(&sta->ps_tx_buf[ac]);
782                 else
783                         skb = NULL;
784                 spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
785 
786                 /*
787                  * frames are queued in order, so if this one
788                  * hasn't expired yet (or we reached the end of
789                  * the queue) we can stop testing
790                  */
791                 if (!skb)
792                         break;
793 
794                 local->total_ps_buffered--;
795                 ps_dbg(sta->sdata, "Buffered frame expired (STA %pM)\n",
796                        sta->sta.addr);
797                 ieee80211_free_txskb(&local->hw, skb);
798         }
799 
800         /*
801          * Finally, recalculate the TIM bit for this station -- it might
802          * now be clear because the station was too slow to retrieve its
803          * frames.
804          */
805         sta_info_recalc_tim(sta);
806 
807         /*
808          * Return whether there are any frames still buffered, this is
809          * used to check whether the cleanup timer still needs to run,
810          * if there are no frames we don't need to rearm the timer.
811          */
812         return !(skb_queue_empty(&sta->ps_tx_buf[ac]) &&
813                  skb_queue_empty(&sta->tx_filtered[ac]));
814 }
815 
816 static bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
817                                              struct sta_info *sta)
818 {
819         bool have_buffered = false;
820         int ac;
821 
822         /* This is only necessary for stations on BSS/MBSS interfaces */
823         if (!sta->sdata->bss &&
824             !ieee80211_vif_is_mesh(&sta->sdata->vif))
825                 return false;
826 
827         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
828                 have_buffered |=
829                         sta_info_cleanup_expire_buffered_ac(local, sta, ac);
830 
831         return have_buffered;
832 }
833 
834 static int __must_check __sta_info_destroy_part1(struct sta_info *sta)
835 {
836         struct ieee80211_local *local;
837         struct ieee80211_sub_if_data *sdata;
838         int ret;
839 
840         might_sleep();
841 
842         if (!sta)
843                 return -ENOENT;
844 
845         local = sta->local;
846         sdata = sta->sdata;
847 
848         lockdep_assert_held(&local->sta_mtx);
849 
850         /*
851          * Before removing the station from the driver and
852          * rate control, it might still start new aggregation
853          * sessions -- block that to make sure the tear-down
854          * will be sufficient.
855          */
856         set_sta_flag(sta, WLAN_STA_BLOCK_BA);
857         ieee80211_sta_tear_down_BA_sessions(sta, AGG_STOP_DESTROY_STA);
858 
859         ret = sta_info_hash_del(local, sta);
860         if (WARN_ON(ret))
861                 return ret;
862 
863         /*
864          * for TDLS peers, make sure to return to the base channel before
865          * removal.
866          */
867         if (test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) {
868                 drv_tdls_cancel_channel_switch(local, sdata, &sta->sta);
869                 clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
870         }
871 
872         list_del_rcu(&sta->list);
873 
874         drv_sta_pre_rcu_remove(local, sta->sdata, sta);
875 
876         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
877             rcu_access_pointer(sdata->u.vlan.sta) == sta)
878                 RCU_INIT_POINTER(sdata->u.vlan.sta, NULL);
879 
880         return 0;
881 }
882 
883 static void __sta_info_destroy_part2(struct sta_info *sta)
884 {
885         struct ieee80211_local *local = sta->local;
886         struct ieee80211_sub_if_data *sdata = sta->sdata;
887         struct station_info sinfo = {};
888         int ret;
889 
890         /*
891          * NOTE: This assumes at least synchronize_net() was done
892          *       after _part1 and before _part2!
893          */
894 
895         might_sleep();
896         lockdep_assert_held(&local->sta_mtx);
897 
898         /* now keys can no longer be reached */
899         ieee80211_free_sta_keys(local, sta);
900 
901         /* disable TIM bit - last chance to tell driver */
902         __sta_info_recalc_tim(sta, true);
903 
904         sta->dead = true;
905 
906         local->num_sta--;
907         local->sta_generation++;
908 
909         while (sta->sta_state > IEEE80211_STA_NONE) {
910                 ret = sta_info_move_state(sta, sta->sta_state - 1);
911                 if (ret) {
912                         WARN_ON_ONCE(1);
913                         break;
914                 }
915         }
916 
917         if (sta->uploaded) {
918                 ret = drv_sta_state(local, sdata, sta, IEEE80211_STA_NONE,
919                                     IEEE80211_STA_NOTEXIST);
920                 WARN_ON_ONCE(ret != 0);
921         }
922 
923         sta_dbg(sdata, "Removed STA %pM\n", sta->sta.addr);
924 
925         sta_set_sinfo(sta, &sinfo);
926         cfg80211_del_sta_sinfo(sdata->dev, sta->sta.addr, &sinfo, GFP_KERNEL);
927 
928         rate_control_remove_sta_debugfs(sta);
929         ieee80211_sta_debugfs_remove(sta);
930         ieee80211_recalc_min_chandef(sdata);
931 
932         cleanup_single_sta(sta);
933 }
934 
935 int __must_check __sta_info_destroy(struct sta_info *sta)
936 {
937         int err = __sta_info_destroy_part1(sta);
938 
939         if (err)
940                 return err;
941 
942         synchronize_net();
943 
944         __sta_info_destroy_part2(sta);
945 
946         return 0;
947 }
948 
949 int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, const u8 *addr)
950 {
951         struct sta_info *sta;
952         int ret;
953 
954         mutex_lock(&sdata->local->sta_mtx);
955         sta = sta_info_get(sdata, addr);
956         ret = __sta_info_destroy(sta);
957         mutex_unlock(&sdata->local->sta_mtx);
958 
959         return ret;
960 }
961 
962 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
963                               const u8 *addr)
964 {
965         struct sta_info *sta;
966         int ret;
967 
968         mutex_lock(&sdata->local->sta_mtx);
969         sta = sta_info_get_bss(sdata, addr);
970         ret = __sta_info_destroy(sta);
971         mutex_unlock(&sdata->local->sta_mtx);
972 
973         return ret;
974 }
975 
976 static void sta_info_cleanup(unsigned long data)
977 {
978         struct ieee80211_local *local = (struct ieee80211_local *) data;
979         struct sta_info *sta;
980         bool timer_needed = false;
981 
982         rcu_read_lock();
983         list_for_each_entry_rcu(sta, &local->sta_list, list)
984                 if (sta_info_cleanup_expire_buffered(local, sta))
985                         timer_needed = true;
986         rcu_read_unlock();
987 
988         if (local->quiescing)
989                 return;
990 
991         if (!timer_needed)
992                 return;
993 
994         mod_timer(&local->sta_cleanup,
995                   round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL));
996 }
997 
998 u32 sta_addr_hash(const void *key, u32 length, u32 seed)
999 {
1000         return jhash(key, ETH_ALEN, seed);
1001 }
1002 
1003 int sta_info_init(struct ieee80211_local *local)
1004 {
1005         int err;
1006 
1007         err = rhashtable_init(&local->sta_hash, &sta_rht_params);
1008         if (err)
1009                 return err;
1010 
1011         spin_lock_init(&local->tim_lock);
1012         mutex_init(&local->sta_mtx);
1013         INIT_LIST_HEAD(&local->sta_list);
1014 
1015         setup_timer(&local->sta_cleanup, sta_info_cleanup,
1016                     (unsigned long)local);
1017         return 0;
1018 }
1019 
1020 void sta_info_stop(struct ieee80211_local *local)
1021 {
1022         del_timer_sync(&local->sta_cleanup);
1023         rhashtable_destroy(&local->sta_hash);
1024 }
1025 
1026 
1027 int __sta_info_flush(struct ieee80211_sub_if_data *sdata, bool vlans)
1028 {
1029         struct ieee80211_local *local = sdata->local;
1030         struct sta_info *sta, *tmp;
1031         LIST_HEAD(free_list);
1032         int ret = 0;
1033 
1034         might_sleep();
1035 
1036         WARN_ON(vlans && sdata->vif.type != NL80211_IFTYPE_AP);
1037         WARN_ON(vlans && !sdata->bss);
1038 
1039         mutex_lock(&local->sta_mtx);
1040         list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1041                 if (sdata == sta->sdata ||
1042                     (vlans && sdata->bss == sta->sdata->bss)) {
1043                         if (!WARN_ON(__sta_info_destroy_part1(sta)))
1044                                 list_add(&sta->free_list, &free_list);
1045                         ret++;
1046                 }
1047         }
1048 
1049         if (!list_empty(&free_list)) {
1050                 synchronize_net();
1051                 list_for_each_entry_safe(sta, tmp, &free_list, free_list)
1052                         __sta_info_destroy_part2(sta);
1053         }
1054         mutex_unlock(&local->sta_mtx);
1055 
1056         return ret;
1057 }
1058 
1059 void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
1060                           unsigned long exp_time)
1061 {
1062         struct ieee80211_local *local = sdata->local;
1063         struct sta_info *sta, *tmp;
1064 
1065         mutex_lock(&local->sta_mtx);
1066 
1067         list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1068                 if (sdata != sta->sdata)
1069                         continue;
1070 
1071                 if (time_after(jiffies, sta->last_rx + exp_time)) {
1072                         sta_dbg(sta->sdata, "expiring inactive STA %pM\n",
1073                                 sta->sta.addr);
1074 
1075                         if (ieee80211_vif_is_mesh(&sdata->vif) &&
1076                             test_sta_flag(sta, WLAN_STA_PS_STA))
1077                                 atomic_dec(&sdata->u.mesh.ps.num_sta_ps);
1078 
1079                         WARN_ON(__sta_info_destroy(sta));
1080                 }
1081         }
1082 
1083         mutex_unlock(&local->sta_mtx);
1084 }
1085 
1086 struct ieee80211_sta *ieee80211_find_sta_by_ifaddr(struct ieee80211_hw *hw,
1087                                                    const u8 *addr,
1088                                                    const u8 *localaddr)
1089 {
1090         struct ieee80211_local *local = hw_to_local(hw);
1091         struct sta_info *sta;
1092         struct rhash_head *tmp;
1093         const struct bucket_table *tbl;
1094 
1095         tbl = rht_dereference_rcu(local->sta_hash.tbl, &local->sta_hash);
1096 
1097         /*
1098          * Just return a random station if localaddr is NULL
1099          * ... first in list.
1100          */
1101         for_each_sta_info(local, tbl, addr, sta, tmp) {
1102                 if (localaddr &&
1103                     !ether_addr_equal(sta->sdata->vif.addr, localaddr))
1104                         continue;
1105                 if (!sta->uploaded)
1106                         return NULL;
1107                 return &sta->sta;
1108         }
1109 
1110         return NULL;
1111 }
1112 EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr);
1113 
1114 struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif,
1115                                          const u8 *addr)
1116 {
1117         struct sta_info *sta;
1118 
1119         if (!vif)
1120                 return NULL;
1121 
1122         sta = sta_info_get_bss(vif_to_sdata(vif), addr);
1123         if (!sta)
1124                 return NULL;
1125 
1126         if (!sta->uploaded)
1127                 return NULL;
1128 
1129         return &sta->sta;
1130 }
1131 EXPORT_SYMBOL(ieee80211_find_sta);
1132 
1133 /* powersave support code */
1134 void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta)
1135 {
1136         struct ieee80211_sub_if_data *sdata = sta->sdata;
1137         struct ieee80211_local *local = sdata->local;
1138         struct sk_buff_head pending;
1139         int filtered = 0, buffered = 0, ac, i;
1140         unsigned long flags;
1141         struct ps_data *ps;
1142 
1143         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1144                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
1145                                      u.ap);
1146 
1147         if (sdata->vif.type == NL80211_IFTYPE_AP)
1148                 ps = &sdata->bss->ps;
1149         else if (ieee80211_vif_is_mesh(&sdata->vif))
1150                 ps = &sdata->u.mesh.ps;
1151         else
1152                 return;
1153 
1154         clear_sta_flag(sta, WLAN_STA_SP);
1155 
1156         BUILD_BUG_ON(BITS_TO_LONGS(IEEE80211_NUM_TIDS) > 1);
1157         sta->driver_buffered_tids = 0;
1158         sta->txq_buffered_tids = 0;
1159 
1160         if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
1161                 drv_sta_notify(local, sdata, STA_NOTIFY_AWAKE, &sta->sta);
1162 
1163         if (sta->sta.txq[0]) {
1164                 for (i = 0; i < ARRAY_SIZE(sta->sta.txq); i++) {
1165                         struct txq_info *txqi = to_txq_info(sta->sta.txq[i]);
1166 
1167                         if (!skb_queue_len(&txqi->queue))
1168                                 continue;
1169 
1170                         drv_wake_tx_queue(local, txqi);
1171                 }
1172         }
1173 
1174         skb_queue_head_init(&pending);
1175 
1176         /* sync with ieee80211_tx_h_unicast_ps_buf */
1177         spin_lock(&sta->ps_lock);
1178         /* Send all buffered frames to the station */
1179         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1180                 int count = skb_queue_len(&pending), tmp;
1181 
1182                 spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
1183                 skb_queue_splice_tail_init(&sta->tx_filtered[ac], &pending);
1184                 spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
1185                 tmp = skb_queue_len(&pending);
1186                 filtered += tmp - count;
1187                 count = tmp;
1188 
1189                 spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
1190                 skb_queue_splice_tail_init(&sta->ps_tx_buf[ac], &pending);
1191                 spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
1192                 tmp = skb_queue_len(&pending);
1193                 buffered += tmp - count;
1194         }
1195 
1196         ieee80211_add_pending_skbs(local, &pending);
1197 
1198         /* now we're no longer in the deliver code */
1199         clear_sta_flag(sta, WLAN_STA_PS_DELIVER);
1200 
1201         /* The station might have polled and then woken up before we responded,
1202          * so clear these flags now to avoid them sticking around.
1203          */
1204         clear_sta_flag(sta, WLAN_STA_PSPOLL);
1205         clear_sta_flag(sta, WLAN_STA_UAPSD);
1206         spin_unlock(&sta->ps_lock);
1207 
1208         atomic_dec(&ps->num_sta_ps);
1209 
1210         /* This station just woke up and isn't aware of our SMPS state */
1211         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
1212             !ieee80211_smps_is_restrictive(sta->known_smps_mode,
1213                                            sdata->smps_mode) &&
1214             sta->known_smps_mode != sdata->bss->req_smps &&
1215             sta_info_tx_streams(sta) != 1) {
1216                 ht_dbg(sdata,
1217                        "%pM just woke up and MIMO capable - update SMPS\n",
1218                        sta->sta.addr);
1219                 ieee80211_send_smps_action(sdata, sdata->bss->req_smps,
1220                                            sta->sta.addr,
1221                                            sdata->vif.bss_conf.bssid);
1222         }
1223 
1224         local->total_ps_buffered -= buffered;
1225 
1226         sta_info_recalc_tim(sta);
1227 
1228         ps_dbg(sdata,
1229                "STA %pM aid %d sending %d filtered/%d PS frames since STA not sleeping anymore\n",
1230                sta->sta.addr, sta->sta.aid, filtered, buffered);
1231 
1232         ieee80211_check_fast_xmit(sta);
1233 }
1234 
1235 static void ieee80211_send_null_response(struct ieee80211_sub_if_data *sdata,
1236                                          struct sta_info *sta, int tid,
1237                                          enum ieee80211_frame_release_type reason,
1238                                          bool call_driver)
1239 {
1240         struct ieee80211_local *local = sdata->local;
1241         struct ieee80211_qos_hdr *nullfunc;
1242         struct sk_buff *skb;
1243         int size = sizeof(*nullfunc);
1244         __le16 fc;
1245         bool qos = sta->sta.wme;
1246         struct ieee80211_tx_info *info;
1247         struct ieee80211_chanctx_conf *chanctx_conf;
1248 
1249         if (qos) {
1250                 fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1251                                  IEEE80211_STYPE_QOS_NULLFUNC |
1252                                  IEEE80211_FCTL_FROMDS);
1253         } else {
1254                 size -= 2;
1255                 fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1256                                  IEEE80211_STYPE_NULLFUNC |
1257                                  IEEE80211_FCTL_FROMDS);
1258         }
1259 
1260         skb = dev_alloc_skb(local->hw.extra_tx_headroom + size);
1261         if (!skb)
1262                 return;
1263 
1264         skb_reserve(skb, local->hw.extra_tx_headroom);
1265 
1266         nullfunc = (void *) skb_put(skb, size);
1267         nullfunc->frame_control = fc;
1268         nullfunc->duration_id = 0;
1269         memcpy(nullfunc->addr1, sta->sta.addr, ETH_ALEN);
1270         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
1271         memcpy(nullfunc->addr3, sdata->vif.addr, ETH_ALEN);
1272         nullfunc->seq_ctrl = 0;
1273 
1274         skb->priority = tid;
1275         skb_set_queue_mapping(skb, ieee802_1d_to_ac[tid]);
1276         if (qos) {
1277                 nullfunc->qos_ctrl = cpu_to_le16(tid);
1278 
1279                 if (reason == IEEE80211_FRAME_RELEASE_UAPSD)
1280                         nullfunc->qos_ctrl |=
1281                                 cpu_to_le16(IEEE80211_QOS_CTL_EOSP);
1282         }
1283 
1284         info = IEEE80211_SKB_CB(skb);
1285 
1286         /*
1287          * Tell TX path to send this frame even though the
1288          * STA may still remain is PS mode after this frame
1289          * exchange. Also set EOSP to indicate this packet
1290          * ends the poll/service period.
1291          */
1292         info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER |
1293                        IEEE80211_TX_STATUS_EOSP |
1294                        IEEE80211_TX_CTL_REQ_TX_STATUS;
1295 
1296         info->control.flags |= IEEE80211_TX_CTRL_PS_RESPONSE;
1297 
1298         if (call_driver)
1299                 drv_allow_buffered_frames(local, sta, BIT(tid), 1,
1300                                           reason, false);
1301 
1302         skb->dev = sdata->dev;
1303 
1304         rcu_read_lock();
1305         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1306         if (WARN_ON(!chanctx_conf)) {
1307                 rcu_read_unlock();
1308                 kfree_skb(skb);
1309                 return;
1310         }
1311 
1312         info->band = chanctx_conf->def.chan->band;
1313         ieee80211_xmit(sdata, sta, skb);
1314         rcu_read_unlock();
1315 }
1316 
1317 static int find_highest_prio_tid(unsigned long tids)
1318 {
1319         /* lower 3 TIDs aren't ordered perfectly */
1320         if (tids & 0xF8)
1321                 return fls(tids) - 1;
1322         /* TID 0 is BE just like TID 3 */
1323         if (tids & BIT(0))
1324                 return 0;
1325         return fls(tids) - 1;
1326 }
1327 
1328 static void
1329 ieee80211_sta_ps_deliver_response(struct sta_info *sta,
1330                                   int n_frames, u8 ignored_acs,
1331                                   enum ieee80211_frame_release_type reason)
1332 {
1333         struct ieee80211_sub_if_data *sdata = sta->sdata;
1334         struct ieee80211_local *local = sdata->local;
1335         bool more_data = false;
1336         int ac;
1337         unsigned long driver_release_tids = 0;
1338         struct sk_buff_head frames;
1339 
1340         /* Service or PS-Poll period starts */
1341         set_sta_flag(sta, WLAN_STA_SP);
1342 
1343         __skb_queue_head_init(&frames);
1344 
1345         /* Get response frame(s) and more data bit for the last one. */
1346         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1347                 unsigned long tids;
1348 
1349                 if (ignored_acs & BIT(ac))
1350                         continue;
1351 
1352                 tids = ieee80211_tids_for_ac(ac);
1353 
1354                 /* if we already have frames from software, then we can't also
1355                  * release from hardware queues
1356                  */
1357                 if (skb_queue_empty(&frames)) {
1358                         driver_release_tids |= sta->driver_buffered_tids & tids;
1359                         driver_release_tids |= sta->txq_buffered_tids & tids;
1360                 }
1361 
1362                 if (driver_release_tids) {
1363                         /* If the driver has data on more than one TID then
1364                          * certainly there's more data if we release just a
1365                          * single frame now (from a single TID). This will
1366                          * only happen for PS-Poll.
1367                          */
1368                         if (reason == IEEE80211_FRAME_RELEASE_PSPOLL &&
1369                             hweight16(driver_release_tids) > 1) {
1370                                 more_data = true;
1371                                 driver_release_tids =
1372                                         BIT(find_highest_prio_tid(
1373                                                 driver_release_tids));
1374                                 break;
1375                         }
1376                 } else {
1377                         struct sk_buff *skb;
1378 
1379                         while (n_frames > 0) {
1380                                 skb = skb_dequeue(&sta->tx_filtered[ac]);
1381                                 if (!skb) {
1382                                         skb = skb_dequeue(
1383                                                 &sta->ps_tx_buf[ac]);
1384                                         if (skb)
1385                                                 local->total_ps_buffered--;
1386                                 }
1387                                 if (!skb)
1388                                         break;
1389                                 n_frames--;
1390                                 __skb_queue_tail(&frames, skb);
1391                         }
1392                 }
1393 
1394                 /* If we have more frames buffered on this AC, then set the
1395                  * more-data bit and abort the loop since we can't send more
1396                  * data from other ACs before the buffered frames from this.
1397                  */
1398                 if (!skb_queue_empty(&sta->tx_filtered[ac]) ||
1399                     !skb_queue_empty(&sta->ps_tx_buf[ac])) {
1400                         more_data = true;
1401                         break;
1402                 }
1403         }
1404 
1405         if (skb_queue_empty(&frames) && !driver_release_tids) {
1406                 int tid;
1407 
1408                 /*
1409                  * For PS-Poll, this can only happen due to a race condition
1410                  * when we set the TIM bit and the station notices it, but
1411                  * before it can poll for the frame we expire it.
1412                  *
1413                  * For uAPSD, this is said in the standard (11.2.1.5 h):
1414                  *      At each unscheduled SP for a non-AP STA, the AP shall
1415                  *      attempt to transmit at least one MSDU or MMPDU, but no
1416                  *      more than the value specified in the Max SP Length field
1417                  *      in the QoS Capability element from delivery-enabled ACs,
1418                  *      that are destined for the non-AP STA.
1419                  *
1420                  * Since we have no other MSDU/MMPDU, transmit a QoS null frame.
1421                  */
1422 
1423                 /* This will evaluate to 1, 3, 5 or 7. */
1424                 tid = 7 - ((ffs(~ignored_acs) - 1) << 1);
1425 
1426                 ieee80211_send_null_response(sdata, sta, tid, reason, true);
1427         } else if (!driver_release_tids) {
1428                 struct sk_buff_head pending;
1429                 struct sk_buff *skb;
1430                 int num = 0;
1431                 u16 tids = 0;
1432                 bool need_null = false;
1433 
1434                 skb_queue_head_init(&pending);
1435 
1436                 while ((skb = __skb_dequeue(&frames))) {
1437                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1438                         struct ieee80211_hdr *hdr = (void *) skb->data;
1439                         u8 *qoshdr = NULL;
1440 
1441                         num++;
1442 
1443                         /*
1444                          * Tell TX path to send this frame even though the
1445                          * STA may still remain is PS mode after this frame
1446                          * exchange.
1447                          */
1448                         info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
1449                         info->control.flags |= IEEE80211_TX_CTRL_PS_RESPONSE;
1450 
1451                         /*
1452                          * Use MoreData flag to indicate whether there are
1453                          * more buffered frames for this STA
1454                          */
1455                         if (more_data || !skb_queue_empty(&frames))
1456                                 hdr->frame_control |=
1457                                         cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1458                         else
1459                                 hdr->frame_control &=
1460                                         cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
1461 
1462                         if (ieee80211_is_data_qos(hdr->frame_control) ||
1463                             ieee80211_is_qos_nullfunc(hdr->frame_control))
1464                                 qoshdr = ieee80211_get_qos_ctl(hdr);
1465 
1466                         tids |= BIT(skb->priority);
1467 
1468                         __skb_queue_tail(&pending, skb);
1469 
1470                         /* end service period after last frame or add one */
1471                         if (!skb_queue_empty(&frames))
1472                                 continue;
1473 
1474                         if (reason != IEEE80211_FRAME_RELEASE_UAPSD) {
1475                                 /* for PS-Poll, there's only one frame */
1476                                 info->flags |= IEEE80211_TX_STATUS_EOSP |
1477                                                IEEE80211_TX_CTL_REQ_TX_STATUS;
1478                                 break;
1479                         }
1480 
1481                         /* For uAPSD, things are a bit more complicated. If the
1482                          * last frame has a QoS header (i.e. is a QoS-data or
1483                          * QoS-nulldata frame) then just set the EOSP bit there
1484                          * and be done.
1485                          * If the frame doesn't have a QoS header (which means
1486                          * it should be a bufferable MMPDU) then we can't set
1487                          * the EOSP bit in the QoS header; add a QoS-nulldata
1488                          * frame to the list to send it after the MMPDU.
1489                          *
1490                          * Note that this code is only in the mac80211-release
1491                          * code path, we assume that the driver will not buffer
1492                          * anything but QoS-data frames, or if it does, will
1493                          * create the QoS-nulldata frame by itself if needed.
1494                          *
1495                          * Cf. 802.11-2012 10.2.1.10 (c).
1496                          */
1497                         if (qoshdr) {
1498                                 *qoshdr |= IEEE80211_QOS_CTL_EOSP;
1499 
1500                                 info->flags |= IEEE80211_TX_STATUS_EOSP |
1501                                                IEEE80211_TX_CTL_REQ_TX_STATUS;
1502                         } else {
1503                                 /* The standard isn't completely clear on this
1504                                  * as it says the more-data bit should be set
1505                                  * if there are more BUs. The QoS-Null frame
1506                                  * we're about to send isn't buffered yet, we
1507                                  * only create it below, but let's pretend it
1508                                  * was buffered just in case some clients only
1509                                  * expect more-data=0 when eosp=1.
1510                                  */
1511                                 hdr->frame_control |=
1512                                         cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1513                                 need_null = true;
1514                                 num++;
1515                         }
1516                         break;
1517                 }
1518 
1519                 drv_allow_buffered_frames(local, sta, tids, num,
1520                                           reason, more_data);
1521 
1522                 ieee80211_add_pending_skbs(local, &pending);
1523 
1524                 if (need_null)
1525                         ieee80211_send_null_response(
1526                                 sdata, sta, find_highest_prio_tid(tids),
1527                                 reason, false);
1528 
1529                 sta_info_recalc_tim(sta);
1530         } else {
1531                 unsigned long tids = sta->txq_buffered_tids & driver_release_tids;
1532                 int tid;
1533 
1534                 /*
1535                  * We need to release a frame that is buffered somewhere in the
1536                  * driver ... it'll have to handle that.
1537                  * Note that the driver also has to check the number of frames
1538                  * on the TIDs we're releasing from - if there are more than
1539                  * n_frames it has to set the more-data bit (if we didn't ask
1540                  * it to set it anyway due to other buffered frames); if there
1541                  * are fewer than n_frames it has to make sure to adjust that
1542                  * to allow the service period to end properly.
1543                  */
1544                 drv_release_buffered_frames(local, sta, driver_release_tids,
1545                                             n_frames, reason, more_data);
1546 
1547                 /*
1548                  * Note that we don't recalculate the TIM bit here as it would
1549                  * most likely have no effect at all unless the driver told us
1550                  * that the TID(s) became empty before returning here from the
1551                  * release function.
1552                  * Either way, however, when the driver tells us that the TID(s)
1553                  * became empty or we find that a txq became empty, we'll do the
1554                  * TIM recalculation.
1555                  */
1556 
1557                 if (!sta->sta.txq[0])
1558                         return;
1559 
1560                 for (tid = 0; tid < ARRAY_SIZE(sta->sta.txq); tid++) {
1561                         struct txq_info *txqi = to_txq_info(sta->sta.txq[tid]);
1562 
1563                         if (!(tids & BIT(tid)) || skb_queue_len(&txqi->queue))
1564                                 continue;
1565 
1566                         sta_info_recalc_tim(sta);
1567                         break;
1568                 }
1569         }
1570 }
1571 
1572 void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta)
1573 {
1574         u8 ignore_for_response = sta->sta.uapsd_queues;
1575 
1576         /*
1577          * If all ACs are delivery-enabled then we should reply
1578          * from any of them, if only some are enabled we reply
1579          * only from the non-enabled ones.
1580          */
1581         if (ignore_for_response == BIT(IEEE80211_NUM_ACS) - 1)
1582                 ignore_for_response = 0;
1583 
1584         ieee80211_sta_ps_deliver_response(sta, 1, ignore_for_response,
1585                                           IEEE80211_FRAME_RELEASE_PSPOLL);
1586 }
1587 
1588 void ieee80211_sta_ps_deliver_uapsd(struct sta_info *sta)
1589 {
1590         int n_frames = sta->sta.max_sp;
1591         u8 delivery_enabled = sta->sta.uapsd_queues;
1592 
1593         /*
1594          * If we ever grow support for TSPEC this might happen if
1595          * the TSPEC update from hostapd comes in between a trigger
1596          * frame setting WLAN_STA_UAPSD in the RX path and this
1597          * actually getting called.
1598          */
1599         if (!delivery_enabled)
1600                 return;
1601 
1602         switch (sta->sta.max_sp) {
1603         case 1:
1604                 n_frames = 2;
1605                 break;
1606         case 2:
1607                 n_frames = 4;
1608                 break;
1609         case 3:
1610                 n_frames = 6;
1611                 break;
1612         case 0:
1613                 /* XXX: what is a good value? */
1614                 n_frames = 128;
1615                 break;
1616         }
1617 
1618         ieee80211_sta_ps_deliver_response(sta, n_frames, ~delivery_enabled,
1619                                           IEEE80211_FRAME_RELEASE_UAPSD);
1620 }
1621 
1622 void ieee80211_sta_block_awake(struct ieee80211_hw *hw,
1623                                struct ieee80211_sta *pubsta, bool block)
1624 {
1625         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1626 
1627         trace_api_sta_block_awake(sta->local, pubsta, block);
1628 
1629         if (block) {
1630                 set_sta_flag(sta, WLAN_STA_PS_DRIVER);
1631                 ieee80211_clear_fast_xmit(sta);
1632                 return;
1633         }
1634 
1635         if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1636                 return;
1637 
1638         if (!test_sta_flag(sta, WLAN_STA_PS_STA)) {
1639                 set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1640                 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
1641                 ieee80211_queue_work(hw, &sta->drv_deliver_wk);
1642         } else if (test_sta_flag(sta, WLAN_STA_PSPOLL) ||
1643                    test_sta_flag(sta, WLAN_STA_UAPSD)) {
1644                 /* must be asleep in this case */
1645                 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
1646                 ieee80211_queue_work(hw, &sta->drv_deliver_wk);
1647         } else {
1648                 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
1649                 ieee80211_check_fast_xmit(sta);
1650         }
1651 }
1652 EXPORT_SYMBOL(ieee80211_sta_block_awake);
1653 
1654 void ieee80211_sta_eosp(struct ieee80211_sta *pubsta)
1655 {
1656         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1657         struct ieee80211_local *local = sta->local;
1658 
1659         trace_api_eosp(local, pubsta);
1660 
1661         clear_sta_flag(sta, WLAN_STA_SP);
1662 }
1663 EXPORT_SYMBOL(ieee80211_sta_eosp);
1664 
1665 void ieee80211_sta_set_buffered(struct ieee80211_sta *pubsta,
1666                                 u8 tid, bool buffered)
1667 {
1668         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1669 
1670         if (WARN_ON(tid >= IEEE80211_NUM_TIDS))
1671                 return;
1672 
1673         trace_api_sta_set_buffered(sta->local, pubsta, tid, buffered);
1674 
1675         if (buffered)
1676                 set_bit(tid, &sta->driver_buffered_tids);
1677         else
1678                 clear_bit(tid, &sta->driver_buffered_tids);
1679 
1680         sta_info_recalc_tim(sta);
1681 }
1682 EXPORT_SYMBOL(ieee80211_sta_set_buffered);
1683 
1684 int sta_info_move_state(struct sta_info *sta,
1685                         enum ieee80211_sta_state new_state)
1686 {
1687         might_sleep();
1688 
1689         if (sta->sta_state == new_state)
1690                 return 0;
1691 
1692         /* check allowed transitions first */
1693 
1694         switch (new_state) {
1695         case IEEE80211_STA_NONE:
1696                 if (sta->sta_state != IEEE80211_STA_AUTH)
1697                         return -EINVAL;
1698                 break;
1699         case IEEE80211_STA_AUTH:
1700                 if (sta->sta_state != IEEE80211_STA_NONE &&
1701                     sta->sta_state != IEEE80211_STA_ASSOC)
1702                         return -EINVAL;
1703                 break;
1704         case IEEE80211_STA_ASSOC:
1705                 if (sta->sta_state != IEEE80211_STA_AUTH &&
1706                     sta->sta_state != IEEE80211_STA_AUTHORIZED)
1707                         return -EINVAL;
1708                 break;
1709         case IEEE80211_STA_AUTHORIZED:
1710                 if (sta->sta_state != IEEE80211_STA_ASSOC)
1711                         return -EINVAL;
1712                 break;
1713         default:
1714                 WARN(1, "invalid state %d", new_state);
1715                 return -EINVAL;
1716         }
1717 
1718         sta_dbg(sta->sdata, "moving STA %pM to state %d\n",
1719                 sta->sta.addr, new_state);
1720 
1721         /*
1722          * notify the driver before the actual changes so it can
1723          * fail the transition
1724          */
1725         if (test_sta_flag(sta, WLAN_STA_INSERTED)) {
1726                 int err = drv_sta_state(sta->local, sta->sdata, sta,
1727                                         sta->sta_state, new_state);
1728                 if (err)
1729                         return err;
1730         }
1731 
1732         /* reflect the change in all state variables */
1733 
1734         switch (new_state) {
1735         case IEEE80211_STA_NONE:
1736                 if (sta->sta_state == IEEE80211_STA_AUTH)
1737                         clear_bit(WLAN_STA_AUTH, &sta->_flags);
1738                 break;
1739         case IEEE80211_STA_AUTH:
1740                 if (sta->sta_state == IEEE80211_STA_NONE)
1741                         set_bit(WLAN_STA_AUTH, &sta->_flags);
1742                 else if (sta->sta_state == IEEE80211_STA_ASSOC)
1743                         clear_bit(WLAN_STA_ASSOC, &sta->_flags);
1744                 break;
1745         case IEEE80211_STA_ASSOC:
1746                 if (sta->sta_state == IEEE80211_STA_AUTH) {
1747                         set_bit(WLAN_STA_ASSOC, &sta->_flags);
1748                 } else if (sta->sta_state == IEEE80211_STA_AUTHORIZED) {
1749                         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1750                             (sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1751                              !sta->sdata->u.vlan.sta))
1752                                 atomic_dec(&sta->sdata->bss->num_mcast_sta);
1753                         clear_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
1754                         ieee80211_clear_fast_xmit(sta);
1755                 }
1756                 break;
1757         case IEEE80211_STA_AUTHORIZED:
1758                 if (sta->sta_state == IEEE80211_STA_ASSOC) {
1759                         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1760                             (sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1761                              !sta->sdata->u.vlan.sta))
1762                                 atomic_inc(&sta->sdata->bss->num_mcast_sta);
1763                         set_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
1764                         ieee80211_check_fast_xmit(sta);
1765                 }
1766                 break;
1767         default:
1768                 break;
1769         }
1770 
1771         sta->sta_state = new_state;
1772 
1773         return 0;
1774 }
1775 
1776 u8 sta_info_tx_streams(struct sta_info *sta)
1777 {
1778         struct ieee80211_sta_ht_cap *ht_cap = &sta->sta.ht_cap;
1779         u8 rx_streams;
1780 
1781         if (!sta->sta.ht_cap.ht_supported)
1782                 return 1;
1783 
1784         if (sta->sta.vht_cap.vht_supported) {
1785                 int i;
1786                 u16 tx_mcs_map =
1787                         le16_to_cpu(sta->sta.vht_cap.vht_mcs.tx_mcs_map);
1788 
1789                 for (i = 7; i >= 0; i--)
1790                         if ((tx_mcs_map & (0x3 << (i * 2))) !=
1791                             IEEE80211_VHT_MCS_NOT_SUPPORTED)
1792                                 return i + 1;
1793         }
1794 
1795         if (ht_cap->mcs.rx_mask[3])
1796                 rx_streams = 4;
1797         else if (ht_cap->mcs.rx_mask[2])
1798                 rx_streams = 3;
1799         else if (ht_cap->mcs.rx_mask[1])
1800                 rx_streams = 2;
1801         else
1802                 rx_streams = 1;
1803 
1804         if (!(ht_cap->mcs.tx_params & IEEE80211_HT_MCS_TX_RX_DIFF))
1805                 return rx_streams;
1806 
1807         return ((ht_cap->mcs.tx_params & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
1808                         >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1;
1809 }
1810 
1811 void sta_set_sinfo(struct sta_info *sta, struct station_info *sinfo)
1812 {
1813         struct ieee80211_sub_if_data *sdata = sta->sdata;
1814         struct ieee80211_local *local = sdata->local;
1815         struct rate_control_ref *ref = NULL;
1816         struct timespec uptime;
1817         u32 thr = 0;
1818         int i, ac;
1819 
1820         if (test_sta_flag(sta, WLAN_STA_RATE_CONTROL))
1821                 ref = local->rate_ctrl;
1822 
1823         sinfo->generation = sdata->local->sta_generation;
1824 
1825         /* do before driver, so beacon filtering drivers have a
1826          * chance to e.g. just add the number of filtered beacons
1827          * (or just modify the value entirely, of course)
1828          */
1829         if (sdata->vif.type == NL80211_IFTYPE_STATION)
1830                 sinfo->rx_beacon = sdata->u.mgd.count_beacon_signal;
1831 
1832         drv_sta_statistics(local, sdata, &sta->sta, sinfo);
1833 
1834         sinfo->filled |= BIT(NL80211_STA_INFO_INACTIVE_TIME) |
1835                          BIT(NL80211_STA_INFO_STA_FLAGS) |
1836                          BIT(NL80211_STA_INFO_BSS_PARAM) |
1837                          BIT(NL80211_STA_INFO_CONNECTED_TIME) |
1838                          BIT(NL80211_STA_INFO_RX_DROP_MISC) |
1839                          BIT(NL80211_STA_INFO_BEACON_LOSS);
1840 
1841         ktime_get_ts(&uptime);
1842         sinfo->connected_time = uptime.tv_sec - sta->last_connected;
1843         sinfo->inactive_time = jiffies_to_msecs(jiffies - sta->last_rx);
1844 
1845         if (!(sinfo->filled & (BIT(NL80211_STA_INFO_TX_BYTES64) |
1846                                BIT(NL80211_STA_INFO_TX_BYTES)))) {
1847                 sinfo->tx_bytes = 0;
1848                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
1849                         sinfo->tx_bytes += sta->tx_bytes[ac];
1850                 sinfo->filled |= BIT(NL80211_STA_INFO_TX_BYTES64);
1851         }
1852 
1853         if (!(sinfo->filled & BIT(NL80211_STA_INFO_TX_PACKETS))) {
1854                 sinfo->tx_packets = 0;
1855                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
1856                         sinfo->tx_packets += sta->tx_packets[ac];
1857                 sinfo->filled |= BIT(NL80211_STA_INFO_TX_PACKETS);
1858         }
1859 
1860         if (!(sinfo->filled & (BIT(NL80211_STA_INFO_RX_BYTES64) |
1861                                BIT(NL80211_STA_INFO_RX_BYTES)))) {
1862                 sinfo->rx_bytes = sta->rx_bytes;
1863                 sinfo->filled |= BIT(NL80211_STA_INFO_RX_BYTES64);
1864         }
1865 
1866         if (!(sinfo->filled & BIT(NL80211_STA_INFO_RX_PACKETS))) {
1867                 sinfo->rx_packets = sta->rx_packets;
1868                 sinfo->filled |= BIT(NL80211_STA_INFO_RX_PACKETS);
1869         }
1870 
1871         if (!(sinfo->filled & BIT(NL80211_STA_INFO_TX_RETRIES))) {
1872                 sinfo->tx_retries = sta->tx_retry_count;
1873                 sinfo->filled |= BIT(NL80211_STA_INFO_TX_RETRIES);
1874         }
1875 
1876         if (!(sinfo->filled & BIT(NL80211_STA_INFO_TX_FAILED))) {
1877                 sinfo->tx_failed = sta->tx_retry_failed;
1878                 sinfo->filled |= BIT(NL80211_STA_INFO_TX_FAILED);
1879         }
1880 
1881         sinfo->rx_dropped_misc = sta->rx_dropped;
1882         sinfo->beacon_loss_count = sta->beacon_loss_count;
1883 
1884         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1885             !(sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)) {
1886                 sinfo->filled |= BIT(NL80211_STA_INFO_BEACON_RX) |
1887                                  BIT(NL80211_STA_INFO_BEACON_SIGNAL_AVG);
1888                 sinfo->rx_beacon_signal_avg = ieee80211_ave_rssi(&sdata->vif);
1889         }
1890 
1891         if (ieee80211_hw_check(&sta->local->hw, SIGNAL_DBM) ||
1892             ieee80211_hw_check(&sta->local->hw, SIGNAL_UNSPEC)) {
1893                 if (!(sinfo->filled & BIT(NL80211_STA_INFO_SIGNAL))) {
1894                         sinfo->signal = (s8)sta->last_signal;
1895                         sinfo->filled |= BIT(NL80211_STA_INFO_SIGNAL);
1896                 }
1897 
1898                 if (!(sinfo->filled & BIT(NL80211_STA_INFO_SIGNAL_AVG))) {
1899                         sinfo->signal_avg =
1900                                 (s8) -ewma_signal_read(&sta->avg_signal);
1901                         sinfo->filled |= BIT(NL80211_STA_INFO_SIGNAL_AVG);
1902                 }
1903         }
1904 
1905         if (sta->chains &&
1906             !(sinfo->filled & (BIT(NL80211_STA_INFO_CHAIN_SIGNAL) |
1907                                BIT(NL80211_STA_INFO_CHAIN_SIGNAL_AVG)))) {
1908                 sinfo->filled |= BIT(NL80211_STA_INFO_CHAIN_SIGNAL) |
1909                                  BIT(NL80211_STA_INFO_CHAIN_SIGNAL_AVG);
1910 
1911                 sinfo->chains = sta->chains;
1912                 for (i = 0; i < ARRAY_SIZE(sinfo->chain_signal); i++) {
1913                         sinfo->chain_signal[i] = sta->chain_signal_last[i];
1914                         sinfo->chain_signal_avg[i] =
1915                                 (s8) -ewma_signal_read(&sta->chain_signal_avg[i]);
1916                 }
1917         }
1918 
1919         if (!(sinfo->filled & BIT(NL80211_STA_INFO_TX_BITRATE))) {
1920                 sta_set_rate_info_tx(sta, &sta->last_tx_rate, &sinfo->txrate);
1921                 sinfo->filled |= BIT(NL80211_STA_INFO_TX_BITRATE);
1922         }
1923 
1924         if (!(sinfo->filled & BIT(NL80211_STA_INFO_RX_BITRATE))) {
1925                 sta_set_rate_info_rx(sta, &sinfo->rxrate);
1926                 sinfo->filled |= BIT(NL80211_STA_INFO_RX_BITRATE);
1927         }
1928 
1929         sinfo->filled |= BIT(NL80211_STA_INFO_TID_STATS);
1930         for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) {
1931                 struct cfg80211_tid_stats *tidstats = &sinfo->pertid[i];
1932 
1933                 if (!(tidstats->filled & BIT(NL80211_TID_STATS_RX_MSDU))) {
1934                         tidstats->filled |= BIT(NL80211_TID_STATS_RX_MSDU);
1935                         tidstats->rx_msdu = sta->rx_msdu[i];
1936                 }
1937 
1938                 if (!(tidstats->filled & BIT(NL80211_TID_STATS_TX_MSDU))) {
1939                         tidstats->filled |= BIT(NL80211_TID_STATS_TX_MSDU);
1940                         tidstats->tx_msdu = sta->tx_msdu[i];
1941                 }
1942 
1943                 if (!(tidstats->filled &
1944                                 BIT(NL80211_TID_STATS_TX_MSDU_RETRIES)) &&
1945                     ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
1946                         tidstats->filled |=
1947                                 BIT(NL80211_TID_STATS_TX_MSDU_RETRIES);
1948                         tidstats->tx_msdu_retries = sta->tx_msdu_retries[i];
1949                 }
1950 
1951                 if (!(tidstats->filled &
1952                                 BIT(NL80211_TID_STATS_TX_MSDU_FAILED)) &&
1953                     ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
1954                         tidstats->filled |=
1955                                 BIT(NL80211_TID_STATS_TX_MSDU_FAILED);
1956                         tidstats->tx_msdu_failed = sta->tx_msdu_failed[i];
1957                 }
1958         }
1959 
1960         if (ieee80211_vif_is_mesh(&sdata->vif)) {
1961 #ifdef CONFIG_MAC80211_MESH
1962                 sinfo->filled |= BIT(NL80211_STA_INFO_LLID) |
1963                                  BIT(NL80211_STA_INFO_PLID) |
1964                                  BIT(NL80211_STA_INFO_PLINK_STATE) |
1965                                  BIT(NL80211_STA_INFO_LOCAL_PM) |
1966                                  BIT(NL80211_STA_INFO_PEER_PM) |
1967                                  BIT(NL80211_STA_INFO_NONPEER_PM);
1968 
1969                 sinfo->llid = sta->mesh->llid;
1970                 sinfo->plid = sta->mesh->plid;
1971                 sinfo->plink_state = sta->mesh->plink_state;
1972                 if (test_sta_flag(sta, WLAN_STA_TOFFSET_KNOWN)) {
1973                         sinfo->filled |= BIT(NL80211_STA_INFO_T_OFFSET);
1974                         sinfo->t_offset = sta->mesh->t_offset;
1975                 }
1976                 sinfo->local_pm = sta->mesh->local_pm;
1977                 sinfo->peer_pm = sta->mesh->peer_pm;
1978                 sinfo->nonpeer_pm = sta->mesh->nonpeer_pm;
1979 #endif
1980         }
1981 
1982         sinfo->bss_param.flags = 0;
1983         if (sdata->vif.bss_conf.use_cts_prot)
1984                 sinfo->bss_param.flags |= BSS_PARAM_FLAGS_CTS_PROT;
1985         if (sdata->vif.bss_conf.use_short_preamble)
1986                 sinfo->bss_param.flags |= BSS_PARAM_FLAGS_SHORT_PREAMBLE;
1987         if (sdata->vif.bss_conf.use_short_slot)
1988                 sinfo->bss_param.flags |= BSS_PARAM_FLAGS_SHORT_SLOT_TIME;
1989         sinfo->bss_param.dtim_period = sdata->vif.bss_conf.dtim_period;
1990         sinfo->bss_param.beacon_interval = sdata->vif.bss_conf.beacon_int;
1991 
1992         sinfo->sta_flags.set = 0;
1993         sinfo->sta_flags.mask = BIT(NL80211_STA_FLAG_AUTHORIZED) |
1994                                 BIT(NL80211_STA_FLAG_SHORT_PREAMBLE) |
1995                                 BIT(NL80211_STA_FLAG_WME) |
1996                                 BIT(NL80211_STA_FLAG_MFP) |
1997                                 BIT(NL80211_STA_FLAG_AUTHENTICATED) |
1998                                 BIT(NL80211_STA_FLAG_ASSOCIATED) |
1999                                 BIT(NL80211_STA_FLAG_TDLS_PEER);
2000         if (test_sta_flag(sta, WLAN_STA_AUTHORIZED))
2001                 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_AUTHORIZED);
2002         if (test_sta_flag(sta, WLAN_STA_SHORT_PREAMBLE))
2003                 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_SHORT_PREAMBLE);
2004         if (sta->sta.wme)
2005                 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_WME);
2006         if (test_sta_flag(sta, WLAN_STA_MFP))
2007                 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_MFP);
2008         if (test_sta_flag(sta, WLAN_STA_AUTH))
2009                 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_AUTHENTICATED);
2010         if (test_sta_flag(sta, WLAN_STA_ASSOC))
2011                 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_ASSOCIATED);
2012         if (test_sta_flag(sta, WLAN_STA_TDLS_PEER))
2013                 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_TDLS_PEER);
2014 
2015         /* check if the driver has a SW RC implementation */
2016         if (ref && ref->ops->get_expected_throughput)
2017                 thr = ref->ops->get_expected_throughput(sta->rate_ctrl_priv);
2018         else
2019                 thr = drv_get_expected_throughput(local, &sta->sta);
2020 
2021         if (thr != 0) {
2022                 sinfo->filled |= BIT(NL80211_STA_INFO_EXPECTED_THROUGHPUT);
2023                 sinfo->expected_throughput = thr;
2024         }
2025 }
2026 

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