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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  *
  5  * This program is free software; you can redistribute it and/or modify
  6  * it under the terms of the GNU General Public License version 2 as
  7  * published by the Free Software Foundation.
  8  */
  9 
 10 #include <linux/module.h>
 11 #include <linux/init.h>
 12 #include <linux/etherdevice.h>
 13 #include <linux/netdevice.h>
 14 #include <linux/types.h>
 15 #include <linux/slab.h>
 16 #include <linux/skbuff.h>
 17 #include <linux/if_arp.h>
 18 #include <linux/timer.h>
 19 #include <linux/rtnetlink.h>
 20 
 21 #include <net/mac80211.h>
 22 #include "ieee80211_i.h"
 23 #include "driver-ops.h"
 24 #include "rate.h"
 25 #include "sta_info.h"
 26 #include "debugfs_sta.h"
 27 #include "mesh.h"
 28 #include "wme.h"
 29 
 30 /**
 31  * DOC: STA information lifetime rules
 32  *
 33  * STA info structures (&struct sta_info) are managed in a hash table
 34  * for faster lookup and a list for iteration. They are managed using
 35  * RCU, i.e. access to the list and hash table is protected by RCU.
 36  *
 37  * Upon allocating a STA info structure with sta_info_alloc(), the caller
 38  * owns that structure. It must then insert it into the hash table using
 39  * either sta_info_insert() or sta_info_insert_rcu(); only in the latter
 40  * case (which acquires an rcu read section but must not be called from
 41  * within one) will the pointer still be valid after the call. Note that
 42  * the caller may not do much with the STA info before inserting it, in
 43  * particular, it may not start any mesh peer link management or add
 44  * encryption keys.
 45  *
 46  * When the insertion fails (sta_info_insert()) returns non-zero), the
 47  * structure will have been freed by sta_info_insert()!
 48  *
 49  * Station entries are added by mac80211 when you establish a link with a
 50  * peer. This means different things for the different type of interfaces
 51  * we support. For a regular station this mean we add the AP sta when we
 52  * receive an association response from the AP. For IBSS this occurs when
 53  * get to know about a peer on the same IBSS. For WDS we add the sta for
 54  * the peer immediately upon device open. When using AP mode we add stations
 55  * for each respective station upon request from userspace through nl80211.
 56  *
 57  * In order to remove a STA info structure, various sta_info_destroy_*()
 58  * calls are available.
 59  *
 60  * There is no concept of ownership on a STA entry, each structure is
 61  * owned by the global hash table/list until it is removed. All users of
 62  * the structure need to be RCU protected so that the structure won't be
 63  * freed before they are done using it.
 64  */
 65 
 66 /* Caller must hold local->sta_mtx */
 67 static int sta_info_hash_del(struct ieee80211_local *local,
 68                              struct sta_info *sta)
 69 {
 70         struct sta_info *s;
 71 
 72         s = rcu_dereference_protected(local->sta_hash[STA_HASH(sta->sta.addr)],
 73                                       lockdep_is_held(&local->sta_mtx));
 74         if (!s)
 75                 return -ENOENT;
 76         if (s == sta) {
 77                 rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)],
 78                                    s->hnext);
 79                 return 0;
 80         }
 81 
 82         while (rcu_access_pointer(s->hnext) &&
 83                rcu_access_pointer(s->hnext) != sta)
 84                 s = rcu_dereference_protected(s->hnext,
 85                                         lockdep_is_held(&local->sta_mtx));
 86         if (rcu_access_pointer(s->hnext)) {
 87                 rcu_assign_pointer(s->hnext, sta->hnext);
 88                 return 0;
 89         }
 90 
 91         return -ENOENT;
 92 }
 93 
 94 static void cleanup_single_sta(struct sta_info *sta)
 95 {
 96         int ac, i;
 97         struct tid_ampdu_tx *tid_tx;
 98         struct ieee80211_sub_if_data *sdata = sta->sdata;
 99         struct ieee80211_local *local = sdata->local;
100         struct ps_data *ps;
101 
102         /*
103          * At this point, when being called as call_rcu callback,
104          * neither mac80211 nor the driver can reference this
105          * sta struct any more except by still existing timers
106          * associated with this station that we clean up below.
107          *
108          * Note though that this still uses the sdata and even
109          * calls the driver in AP and mesh mode, so interfaces
110          * of those types mush use call sta_info_flush_cleanup()
111          * (typically via sta_info_flush()) before deconfiguring
112          * the driver.
113          *
114          * In station mode, nothing happens here so it doesn't
115          * have to (and doesn't) do that, this is intentional to
116          * speed up roaming.
117          */
118 
119         if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
120                 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
121                     sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
122                         ps = &sdata->bss->ps;
123                 else if (ieee80211_vif_is_mesh(&sdata->vif))
124                         ps = &sdata->u.mesh.ps;
125                 else
126                         return;
127 
128                 clear_sta_flag(sta, WLAN_STA_PS_STA);
129 
130                 atomic_dec(&ps->num_sta_ps);
131                 sta_info_recalc_tim(sta);
132         }
133 
134         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
135                 local->total_ps_buffered -= skb_queue_len(&sta->ps_tx_buf[ac]);
136                 ieee80211_purge_tx_queue(&local->hw, &sta->ps_tx_buf[ac]);
137                 ieee80211_purge_tx_queue(&local->hw, &sta->tx_filtered[ac]);
138         }
139 
140         if (ieee80211_vif_is_mesh(&sdata->vif))
141                 mesh_sta_cleanup(sta);
142 
143         cancel_work_sync(&sta->drv_unblock_wk);
144 
145         /*
146          * Destroy aggregation state here. It would be nice to wait for the
147          * driver to finish aggregation stop and then clean up, but for now
148          * drivers have to handle aggregation stop being requested, followed
149          * directly by station destruction.
150          */
151         for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
152                 kfree(sta->ampdu_mlme.tid_start_tx[i]);
153                 tid_tx = rcu_dereference_raw(sta->ampdu_mlme.tid_tx[i]);
154                 if (!tid_tx)
155                         continue;
156                 ieee80211_purge_tx_queue(&local->hw, &tid_tx->pending);
157                 kfree(tid_tx);
158         }
159 
160         sta_info_free(local, sta);
161 }
162 
163 void ieee80211_cleanup_sdata_stas(struct ieee80211_sub_if_data *sdata)
164 {
165         struct sta_info *sta;
166 
167         spin_lock_bh(&sdata->cleanup_stations_lock);
168         while (!list_empty(&sdata->cleanup_stations)) {
169                 sta = list_first_entry(&sdata->cleanup_stations,
170                                        struct sta_info, list);
171                 list_del(&sta->list);
172                 spin_unlock_bh(&sdata->cleanup_stations_lock);
173 
174                 cleanup_single_sta(sta);
175 
176                 spin_lock_bh(&sdata->cleanup_stations_lock);
177         }
178 
179         spin_unlock_bh(&sdata->cleanup_stations_lock);
180 }
181 
182 static void free_sta_rcu(struct rcu_head *h)
183 {
184         struct sta_info *sta = container_of(h, struct sta_info, rcu_head);
185         struct ieee80211_sub_if_data *sdata = sta->sdata;
186 
187         spin_lock(&sdata->cleanup_stations_lock);
188         list_add_tail(&sta->list, &sdata->cleanup_stations);
189         spin_unlock(&sdata->cleanup_stations_lock);
190 
191         ieee80211_queue_work(&sdata->local->hw, &sdata->cleanup_stations_wk);
192 }
193 
194 /* protected by RCU */
195 struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata,
196                               const u8 *addr)
197 {
198         struct ieee80211_local *local = sdata->local;
199         struct sta_info *sta;
200 
201         sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)],
202                                     lockdep_is_held(&local->sta_mtx));
203         while (sta) {
204                 if (sta->sdata == sdata &&
205                     ether_addr_equal(sta->sta.addr, addr))
206                         break;
207                 sta = rcu_dereference_check(sta->hnext,
208                                             lockdep_is_held(&local->sta_mtx));
209         }
210         return sta;
211 }
212 
213 /*
214  * Get sta info either from the specified interface
215  * or from one of its vlans
216  */
217 struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata,
218                                   const u8 *addr)
219 {
220         struct ieee80211_local *local = sdata->local;
221         struct sta_info *sta;
222 
223         sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)],
224                                     lockdep_is_held(&local->sta_mtx));
225         while (sta) {
226                 if ((sta->sdata == sdata ||
227                      (sta->sdata->bss && sta->sdata->bss == sdata->bss)) &&
228                     ether_addr_equal(sta->sta.addr, addr))
229                         break;
230                 sta = rcu_dereference_check(sta->hnext,
231                                             lockdep_is_held(&local->sta_mtx));
232         }
233         return sta;
234 }
235 
236 struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
237                                      int idx)
238 {
239         struct ieee80211_local *local = sdata->local;
240         struct sta_info *sta;
241         int i = 0;
242 
243         list_for_each_entry_rcu(sta, &local->sta_list, list) {
244                 if (sdata != sta->sdata)
245                         continue;
246                 if (i < idx) {
247                         ++i;
248                         continue;
249                 }
250                 return sta;
251         }
252 
253         return NULL;
254 }
255 
256 /**
257  * sta_info_free - free STA
258  *
259  * @local: pointer to the global information
260  * @sta: STA info to free
261  *
262  * This function must undo everything done by sta_info_alloc()
263  * that may happen before sta_info_insert(). It may only be
264  * called when sta_info_insert() has not been attempted (and
265  * if that fails, the station is freed anyway.)
266  */
267 void sta_info_free(struct ieee80211_local *local, struct sta_info *sta)
268 {
269         if (sta->rate_ctrl)
270                 rate_control_free_sta(sta);
271 
272         sta_dbg(sta->sdata, "Destroyed STA %pM\n", sta->sta.addr);
273 
274         kfree(sta);
275 }
276 
277 /* Caller must hold local->sta_mtx */
278 static void sta_info_hash_add(struct ieee80211_local *local,
279                               struct sta_info *sta)
280 {
281         lockdep_assert_held(&local->sta_mtx);
282         sta->hnext = local->sta_hash[STA_HASH(sta->sta.addr)];
283         rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)], sta);
284 }
285 
286 static void sta_unblock(struct work_struct *wk)
287 {
288         struct sta_info *sta;
289 
290         sta = container_of(wk, struct sta_info, drv_unblock_wk);
291 
292         if (sta->dead)
293                 return;
294 
295         if (!test_sta_flag(sta, WLAN_STA_PS_STA)) {
296                 local_bh_disable();
297                 ieee80211_sta_ps_deliver_wakeup(sta);
298                 local_bh_enable();
299         } else if (test_and_clear_sta_flag(sta, WLAN_STA_PSPOLL)) {
300                 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
301 
302                 local_bh_disable();
303                 ieee80211_sta_ps_deliver_poll_response(sta);
304                 local_bh_enable();
305         } else if (test_and_clear_sta_flag(sta, WLAN_STA_UAPSD)) {
306                 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
307 
308                 local_bh_disable();
309                 ieee80211_sta_ps_deliver_uapsd(sta);
310                 local_bh_enable();
311         } else
312                 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
313 }
314 
315 static int sta_prepare_rate_control(struct ieee80211_local *local,
316                                     struct sta_info *sta, gfp_t gfp)
317 {
318         if (local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)
319                 return 0;
320 
321         sta->rate_ctrl = local->rate_ctrl;
322         sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl,
323                                                      &sta->sta, gfp);
324         if (!sta->rate_ctrl_priv)
325                 return -ENOMEM;
326 
327         return 0;
328 }
329 
330 struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
331                                 const u8 *addr, gfp_t gfp)
332 {
333         struct ieee80211_local *local = sdata->local;
334         struct sta_info *sta;
335         struct timespec uptime;
336         int i;
337 
338         sta = kzalloc(sizeof(*sta) + local->hw.sta_data_size, gfp);
339         if (!sta)
340                 return NULL;
341 
342         spin_lock_init(&sta->lock);
343         spin_lock_init(&sta->ps_lock);
344         INIT_WORK(&sta->drv_unblock_wk, sta_unblock);
345         INIT_WORK(&sta->ampdu_mlme.work, ieee80211_ba_session_work);
346         mutex_init(&sta->ampdu_mlme.mtx);
347 #ifdef CONFIG_MAC80211_MESH
348         if (ieee80211_vif_is_mesh(&sdata->vif) &&
349             !sdata->u.mesh.user_mpm)
350                 init_timer(&sta->plink_timer);
351         sta->nonpeer_pm = NL80211_MESH_POWER_ACTIVE;
352 #endif
353 
354         memcpy(sta->sta.addr, addr, ETH_ALEN);
355         sta->local = local;
356         sta->sdata = sdata;
357         sta->last_rx = jiffies;
358 
359         sta->sta_state = IEEE80211_STA_NONE;
360 
361         do_posix_clock_monotonic_gettime(&uptime);
362         sta->last_connected = uptime.tv_sec;
363         ewma_init(&sta->avg_signal, 1024, 8);
364         for (i = 0; i < ARRAY_SIZE(sta->chain_signal_avg); i++)
365                 ewma_init(&sta->chain_signal_avg[i], 1024, 8);
366 
367         if (sta_prepare_rate_control(local, sta, gfp)) {
368                 kfree(sta);
369                 return NULL;
370         }
371 
372         for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
373                 /*
374                  * timer_to_tid must be initialized with identity mapping
375                  * to enable session_timer's data differentiation. See
376                  * sta_rx_agg_session_timer_expired for usage.
377                  */
378                 sta->timer_to_tid[i] = i;
379         }
380         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
381                 skb_queue_head_init(&sta->ps_tx_buf[i]);
382                 skb_queue_head_init(&sta->tx_filtered[i]);
383         }
384 
385         for (i = 0; i < IEEE80211_NUM_TIDS; i++)
386                 sta->last_seq_ctrl[i] = cpu_to_le16(USHRT_MAX);
387 
388         sta->sta.smps_mode = IEEE80211_SMPS_OFF;
389         if (sdata->vif.type == NL80211_IFTYPE_AP ||
390             sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
391                 struct ieee80211_supported_band *sband =
392                         local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
393                 u8 smps = (sband->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >>
394                                 IEEE80211_HT_CAP_SM_PS_SHIFT;
395                 /*
396                  * Assume that hostapd advertises our caps in the beacon and
397                  * this is the known_smps_mode for a station that just assciated
398                  */
399                 switch (smps) {
400                 case WLAN_HT_SMPS_CONTROL_DISABLED:
401                         sta->known_smps_mode = IEEE80211_SMPS_OFF;
402                         break;
403                 case WLAN_HT_SMPS_CONTROL_STATIC:
404                         sta->known_smps_mode = IEEE80211_SMPS_STATIC;
405                         break;
406                 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
407                         sta->known_smps_mode = IEEE80211_SMPS_DYNAMIC;
408                         break;
409                 default:
410                         WARN_ON(1);
411                 }
412         }
413 
414         sta_dbg(sdata, "Allocated STA %pM\n", sta->sta.addr);
415 
416         return sta;
417 }
418 
419 static int sta_info_insert_check(struct sta_info *sta)
420 {
421         struct ieee80211_sub_if_data *sdata = sta->sdata;
422 
423         /*
424          * Can't be a WARN_ON because it can be triggered through a race:
425          * something inserts a STA (on one CPU) without holding the RTNL
426          * and another CPU turns off the net device.
427          */
428         if (unlikely(!ieee80211_sdata_running(sdata)))
429                 return -ENETDOWN;
430 
431         if (WARN_ON(ether_addr_equal(sta->sta.addr, sdata->vif.addr) ||
432                     is_multicast_ether_addr(sta->sta.addr)))
433                 return -EINVAL;
434 
435         return 0;
436 }
437 
438 static int sta_info_insert_drv_state(struct ieee80211_local *local,
439                                      struct ieee80211_sub_if_data *sdata,
440                                      struct sta_info *sta)
441 {
442         enum ieee80211_sta_state state;
443         int err = 0;
444 
445         for (state = IEEE80211_STA_NOTEXIST; state < sta->sta_state; state++) {
446                 err = drv_sta_state(local, sdata, sta, state, state + 1);
447                 if (err)
448                         break;
449         }
450 
451         if (!err) {
452                 /*
453                  * Drivers using legacy sta_add/sta_remove callbacks only
454                  * get uploaded set to true after sta_add is called.
455                  */
456                 if (!local->ops->sta_add)
457                         sta->uploaded = true;
458                 return 0;
459         }
460 
461         if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
462                 sdata_info(sdata,
463                            "failed to move IBSS STA %pM to state %d (%d) - keeping it anyway\n",
464                            sta->sta.addr, state + 1, err);
465                 err = 0;
466         }
467 
468         /* unwind on error */
469         for (; state > IEEE80211_STA_NOTEXIST; state--)
470                 WARN_ON(drv_sta_state(local, sdata, sta, state, state - 1));
471 
472         return err;
473 }
474 
475 /*
476  * should be called with sta_mtx locked
477  * this function replaces the mutex lock
478  * with a RCU lock
479  */
480 static int sta_info_insert_finish(struct sta_info *sta) __acquires(RCU)
481 {
482         struct ieee80211_local *local = sta->local;
483         struct ieee80211_sub_if_data *sdata = sta->sdata;
484         struct station_info sinfo;
485         int err = 0;
486 
487         lockdep_assert_held(&local->sta_mtx);
488 
489         /* check if STA exists already */
490         if (sta_info_get_bss(sdata, sta->sta.addr)) {
491                 err = -EEXIST;
492                 goto out_err;
493         }
494 
495         /* notify driver */
496         err = sta_info_insert_drv_state(local, sdata, sta);
497         if (err)
498                 goto out_err;
499 
500         local->num_sta++;
501         local->sta_generation++;
502         smp_mb();
503 
504         /* make the station visible */
505         sta_info_hash_add(local, sta);
506 
507         list_add_rcu(&sta->list, &local->sta_list);
508 
509         set_sta_flag(sta, WLAN_STA_INSERTED);
510 
511         ieee80211_sta_debugfs_add(sta);
512         rate_control_add_sta_debugfs(sta);
513 
514         memset(&sinfo, 0, sizeof(sinfo));
515         sinfo.filled = 0;
516         sinfo.generation = local->sta_generation;
517         cfg80211_new_sta(sdata->dev, sta->sta.addr, &sinfo, GFP_KERNEL);
518 
519         sta_dbg(sdata, "Inserted STA %pM\n", sta->sta.addr);
520 
521         /* move reference to rcu-protected */
522         rcu_read_lock();
523         mutex_unlock(&local->sta_mtx);
524 
525         if (ieee80211_vif_is_mesh(&sdata->vif))
526                 mesh_accept_plinks_update(sdata);
527 
528         return 0;
529  out_err:
530         mutex_unlock(&local->sta_mtx);
531         rcu_read_lock();
532         return err;
533 }
534 
535 int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU)
536 {
537         struct ieee80211_local *local = sta->local;
538         int err = 0;
539 
540         might_sleep();
541 
542         err = sta_info_insert_check(sta);
543         if (err) {
544                 rcu_read_lock();
545                 goto out_free;
546         }
547 
548         mutex_lock(&local->sta_mtx);
549 
550         err = sta_info_insert_finish(sta);
551         if (err)
552                 goto out_free;
553 
554         return 0;
555  out_free:
556         BUG_ON(!err);
557         sta_info_free(local, sta);
558         return err;
559 }
560 
561 int sta_info_insert(struct sta_info *sta)
562 {
563         int err = sta_info_insert_rcu(sta);
564 
565         rcu_read_unlock();
566 
567         return err;
568 }
569 
570 static inline void __bss_tim_set(u8 *tim, u16 id)
571 {
572         /*
573          * This format has been mandated by the IEEE specifications,
574          * so this line may not be changed to use the __set_bit() format.
575          */
576         tim[id / 8] |= (1 << (id % 8));
577 }
578 
579 static inline void __bss_tim_clear(u8 *tim, u16 id)
580 {
581         /*
582          * This format has been mandated by the IEEE specifications,
583          * so this line may not be changed to use the __clear_bit() format.
584          */
585         tim[id / 8] &= ~(1 << (id % 8));
586 }
587 
588 static inline bool __bss_tim_get(u8 *tim, u16 id)
589 {
590         /*
591          * This format has been mandated by the IEEE specifications,
592          * so this line may not be changed to use the test_bit() format.
593          */
594         return tim[id / 8] & (1 << (id % 8));
595 }
596 
597 static unsigned long ieee80211_tids_for_ac(int ac)
598 {
599         /* If we ever support TIDs > 7, this obviously needs to be adjusted */
600         switch (ac) {
601         case IEEE80211_AC_VO:
602                 return BIT(6) | BIT(7);
603         case IEEE80211_AC_VI:
604                 return BIT(4) | BIT(5);
605         case IEEE80211_AC_BE:
606                 return BIT(0) | BIT(3);
607         case IEEE80211_AC_BK:
608                 return BIT(1) | BIT(2);
609         default:
610                 WARN_ON(1);
611                 return 0;
612         }
613 }
614 
615 void sta_info_recalc_tim(struct sta_info *sta)
616 {
617         struct ieee80211_local *local = sta->local;
618         struct ps_data *ps;
619         bool indicate_tim = false;
620         u8 ignore_for_tim = sta->sta.uapsd_queues;
621         int ac;
622         u16 id;
623 
624         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
625             sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
626                 if (WARN_ON_ONCE(!sta->sdata->bss))
627                         return;
628 
629                 ps = &sta->sdata->bss->ps;
630                 id = sta->sta.aid;
631 #ifdef CONFIG_MAC80211_MESH
632         } else if (ieee80211_vif_is_mesh(&sta->sdata->vif)) {
633                 ps = &sta->sdata->u.mesh.ps;
634                 /* TIM map only for PLID <= IEEE80211_MAX_AID */
635                 id = le16_to_cpu(sta->plid) % IEEE80211_MAX_AID;
636 #endif
637         } else {
638                 return;
639         }
640 
641         /* No need to do anything if the driver does all */
642         if (local->hw.flags & IEEE80211_HW_AP_LINK_PS)
643                 return;
644 
645         if (sta->dead)
646                 goto done;
647 
648         /*
649          * If all ACs are delivery-enabled then we should build
650          * the TIM bit for all ACs anyway; if only some are then
651          * we ignore those and build the TIM bit using only the
652          * non-enabled ones.
653          */
654         if (ignore_for_tim == BIT(IEEE80211_NUM_ACS) - 1)
655                 ignore_for_tim = 0;
656 
657         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
658                 unsigned long tids;
659 
660                 if (ignore_for_tim & BIT(ac))
661                         continue;
662 
663                 indicate_tim |= !skb_queue_empty(&sta->tx_filtered[ac]) ||
664                                 !skb_queue_empty(&sta->ps_tx_buf[ac]);
665                 if (indicate_tim)
666                         break;
667 
668                 tids = ieee80211_tids_for_ac(ac);
669 
670                 indicate_tim |=
671                         sta->driver_buffered_tids & tids;
672         }
673 
674  done:
675         spin_lock_bh(&local->tim_lock);
676 
677         if (indicate_tim == __bss_tim_get(ps->tim, id))
678                 goto out_unlock;
679 
680         if (indicate_tim)
681                 __bss_tim_set(ps->tim, id);
682         else
683                 __bss_tim_clear(ps->tim, id);
684 
685         if (local->ops->set_tim) {
686                 local->tim_in_locked_section = true;
687                 drv_set_tim(local, &sta->sta, indicate_tim);
688                 local->tim_in_locked_section = false;
689         }
690 
691 out_unlock:
692         spin_unlock_bh(&local->tim_lock);
693 }
694 
695 static bool sta_info_buffer_expired(struct sta_info *sta, struct sk_buff *skb)
696 {
697         struct ieee80211_tx_info *info;
698         int timeout;
699 
700         if (!skb)
701                 return false;
702 
703         info = IEEE80211_SKB_CB(skb);
704 
705         /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
706         timeout = (sta->listen_interval *
707                    sta->sdata->vif.bss_conf.beacon_int *
708                    32 / 15625) * HZ;
709         if (timeout < STA_TX_BUFFER_EXPIRE)
710                 timeout = STA_TX_BUFFER_EXPIRE;
711         return time_after(jiffies, info->control.jiffies + timeout);
712 }
713 
714 
715 static bool sta_info_cleanup_expire_buffered_ac(struct ieee80211_local *local,
716                                                 struct sta_info *sta, int ac)
717 {
718         unsigned long flags;
719         struct sk_buff *skb;
720 
721         /*
722          * First check for frames that should expire on the filtered
723          * queue. Frames here were rejected by the driver and are on
724          * a separate queue to avoid reordering with normal PS-buffered
725          * frames. They also aren't accounted for right now in the
726          * total_ps_buffered counter.
727          */
728         for (;;) {
729                 spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
730                 skb = skb_peek(&sta->tx_filtered[ac]);
731                 if (sta_info_buffer_expired(sta, skb))
732                         skb = __skb_dequeue(&sta->tx_filtered[ac]);
733                 else
734                         skb = NULL;
735                 spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
736 
737                 /*
738                  * Frames are queued in order, so if this one
739                  * hasn't expired yet we can stop testing. If
740                  * we actually reached the end of the queue we
741                  * also need to stop, of course.
742                  */
743                 if (!skb)
744                         break;
745                 ieee80211_free_txskb(&local->hw, skb);
746         }
747 
748         /*
749          * Now also check the normal PS-buffered queue, this will
750          * only find something if the filtered queue was emptied
751          * since the filtered frames are all before the normal PS
752          * buffered frames.
753          */
754         for (;;) {
755                 spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
756                 skb = skb_peek(&sta->ps_tx_buf[ac]);
757                 if (sta_info_buffer_expired(sta, skb))
758                         skb = __skb_dequeue(&sta->ps_tx_buf[ac]);
759                 else
760                         skb = NULL;
761                 spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
762 
763                 /*
764                  * frames are queued in order, so if this one
765                  * hasn't expired yet (or we reached the end of
766                  * the queue) we can stop testing
767                  */
768                 if (!skb)
769                         break;
770 
771                 local->total_ps_buffered--;
772                 ps_dbg(sta->sdata, "Buffered frame expired (STA %pM)\n",
773                        sta->sta.addr);
774                 ieee80211_free_txskb(&local->hw, skb);
775         }
776 
777         /*
778          * Finally, recalculate the TIM bit for this station -- it might
779          * now be clear because the station was too slow to retrieve its
780          * frames.
781          */
782         sta_info_recalc_tim(sta);
783 
784         /*
785          * Return whether there are any frames still buffered, this is
786          * used to check whether the cleanup timer still needs to run,
787          * if there are no frames we don't need to rearm the timer.
788          */
789         return !(skb_queue_empty(&sta->ps_tx_buf[ac]) &&
790                  skb_queue_empty(&sta->tx_filtered[ac]));
791 }
792 
793 static bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
794                                              struct sta_info *sta)
795 {
796         bool have_buffered = false;
797         int ac;
798 
799         /* This is only necessary for stations on BSS/MBSS interfaces */
800         if (!sta->sdata->bss &&
801             !ieee80211_vif_is_mesh(&sta->sdata->vif))
802                 return false;
803 
804         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
805                 have_buffered |=
806                         sta_info_cleanup_expire_buffered_ac(local, sta, ac);
807 
808         return have_buffered;
809 }
810 
811 int __must_check __sta_info_destroy(struct sta_info *sta)
812 {
813         struct ieee80211_local *local;
814         struct ieee80211_sub_if_data *sdata;
815         int ret;
816 
817         might_sleep();
818 
819         if (!sta)
820                 return -ENOENT;
821 
822         local = sta->local;
823         sdata = sta->sdata;
824 
825         lockdep_assert_held(&local->sta_mtx);
826 
827         /*
828          * Before removing the station from the driver and
829          * rate control, it might still start new aggregation
830          * sessions -- block that to make sure the tear-down
831          * will be sufficient.
832          */
833         set_sta_flag(sta, WLAN_STA_BLOCK_BA);
834         ieee80211_sta_tear_down_BA_sessions(sta, AGG_STOP_DESTROY_STA);
835 
836         ret = sta_info_hash_del(local, sta);
837         if (ret)
838                 return ret;
839 
840         list_del_rcu(&sta->list);
841 
842         /* this always calls synchronize_net() */
843         ieee80211_free_sta_keys(local, sta);
844 
845         sta->dead = true;
846 
847         local->num_sta--;
848         local->sta_generation++;
849 
850         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
851                 RCU_INIT_POINTER(sdata->u.vlan.sta, NULL);
852 
853         while (sta->sta_state > IEEE80211_STA_NONE) {
854                 ret = sta_info_move_state(sta, sta->sta_state - 1);
855                 if (ret) {
856                         WARN_ON_ONCE(1);
857                         break;
858                 }
859         }
860 
861         if (sta->uploaded) {
862                 ret = drv_sta_state(local, sdata, sta, IEEE80211_STA_NONE,
863                                     IEEE80211_STA_NOTEXIST);
864                 WARN_ON_ONCE(ret != 0);
865         }
866 
867         sta_dbg(sdata, "Removed STA %pM\n", sta->sta.addr);
868 
869         cfg80211_del_sta(sdata->dev, sta->sta.addr, GFP_KERNEL);
870 
871         rate_control_remove_sta_debugfs(sta);
872         ieee80211_sta_debugfs_remove(sta);
873 
874         call_rcu(&sta->rcu_head, free_sta_rcu);
875 
876         return 0;
877 }
878 
879 int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, const u8 *addr)
880 {
881         struct sta_info *sta;
882         int ret;
883 
884         mutex_lock(&sdata->local->sta_mtx);
885         sta = sta_info_get(sdata, addr);
886         ret = __sta_info_destroy(sta);
887         mutex_unlock(&sdata->local->sta_mtx);
888 
889         return ret;
890 }
891 
892 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
893                               const u8 *addr)
894 {
895         struct sta_info *sta;
896         int ret;
897 
898         mutex_lock(&sdata->local->sta_mtx);
899         sta = sta_info_get_bss(sdata, addr);
900         ret = __sta_info_destroy(sta);
901         mutex_unlock(&sdata->local->sta_mtx);
902 
903         return ret;
904 }
905 
906 static void sta_info_cleanup(unsigned long data)
907 {
908         struct ieee80211_local *local = (struct ieee80211_local *) data;
909         struct sta_info *sta;
910         bool timer_needed = false;
911 
912         rcu_read_lock();
913         list_for_each_entry_rcu(sta, &local->sta_list, list)
914                 if (sta_info_cleanup_expire_buffered(local, sta))
915                         timer_needed = true;
916         rcu_read_unlock();
917 
918         if (local->quiescing)
919                 return;
920 
921         if (!timer_needed)
922                 return;
923 
924         mod_timer(&local->sta_cleanup,
925                   round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL));
926 }
927 
928 void sta_info_init(struct ieee80211_local *local)
929 {
930         spin_lock_init(&local->tim_lock);
931         mutex_init(&local->sta_mtx);
932         INIT_LIST_HEAD(&local->sta_list);
933 
934         setup_timer(&local->sta_cleanup, sta_info_cleanup,
935                     (unsigned long)local);
936 }
937 
938 void sta_info_stop(struct ieee80211_local *local)
939 {
940         del_timer_sync(&local->sta_cleanup);
941 }
942 
943 
944 int sta_info_flush_defer(struct ieee80211_sub_if_data *sdata)
945 {
946         struct ieee80211_local *local = sdata->local;
947         struct sta_info *sta, *tmp;
948         int ret = 0;
949 
950         might_sleep();
951 
952         mutex_lock(&local->sta_mtx);
953         list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
954                 if (sdata == sta->sdata) {
955                         WARN_ON(__sta_info_destroy(sta));
956                         ret++;
957                 }
958         }
959         mutex_unlock(&local->sta_mtx);
960 
961         return ret;
962 }
963 
964 void sta_info_flush_cleanup(struct ieee80211_sub_if_data *sdata)
965 {
966         ieee80211_cleanup_sdata_stas(sdata);
967         cancel_work_sync(&sdata->cleanup_stations_wk);
968 }
969 
970 void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
971                           unsigned long exp_time)
972 {
973         struct ieee80211_local *local = sdata->local;
974         struct sta_info *sta, *tmp;
975 
976         mutex_lock(&local->sta_mtx);
977 
978         list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
979                 if (sdata != sta->sdata)
980                         continue;
981 
982                 if (time_after(jiffies, sta->last_rx + exp_time)) {
983                         sta_dbg(sta->sdata, "expiring inactive STA %pM\n",
984                                 sta->sta.addr);
985 
986                         if (ieee80211_vif_is_mesh(&sdata->vif) &&
987                             test_sta_flag(sta, WLAN_STA_PS_STA))
988                                 atomic_dec(&sdata->u.mesh.ps.num_sta_ps);
989 
990                         WARN_ON(__sta_info_destroy(sta));
991                 }
992         }
993 
994         mutex_unlock(&local->sta_mtx);
995 }
996 
997 struct ieee80211_sta *ieee80211_find_sta_by_ifaddr(struct ieee80211_hw *hw,
998                                                const u8 *addr,
999                                                const u8 *localaddr)
1000 {
1001         struct sta_info *sta, *nxt;
1002 
1003         /*
1004          * Just return a random station if localaddr is NULL
1005          * ... first in list.
1006          */
1007         for_each_sta_info(hw_to_local(hw), addr, sta, nxt) {
1008                 if (localaddr &&
1009                     !ether_addr_equal(sta->sdata->vif.addr, localaddr))
1010                         continue;
1011                 if (!sta->uploaded)
1012                         return NULL;
1013                 return &sta->sta;
1014         }
1015 
1016         return NULL;
1017 }
1018 EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr);
1019 
1020 struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif,
1021                                          const u8 *addr)
1022 {
1023         struct sta_info *sta;
1024 
1025         if (!vif)
1026                 return NULL;
1027 
1028         sta = sta_info_get_bss(vif_to_sdata(vif), addr);
1029         if (!sta)
1030                 return NULL;
1031 
1032         if (!sta->uploaded)
1033                 return NULL;
1034 
1035         return &sta->sta;
1036 }
1037 EXPORT_SYMBOL(ieee80211_find_sta);
1038 
1039 static void clear_sta_ps_flags(void *_sta)
1040 {
1041         struct sta_info *sta = _sta;
1042         struct ieee80211_sub_if_data *sdata = sta->sdata;
1043         struct ps_data *ps;
1044 
1045         if (sdata->vif.type == NL80211_IFTYPE_AP ||
1046             sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1047                 ps = &sdata->bss->ps;
1048         else if (ieee80211_vif_is_mesh(&sdata->vif))
1049                 ps = &sdata->u.mesh.ps;
1050         else
1051                 return;
1052 
1053         clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
1054         if (test_and_clear_sta_flag(sta, WLAN_STA_PS_STA))
1055                 atomic_dec(&ps->num_sta_ps);
1056 }
1057 
1058 /* powersave support code */
1059 void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta)
1060 {
1061         struct ieee80211_sub_if_data *sdata = sta->sdata;
1062         struct ieee80211_local *local = sdata->local;
1063         struct sk_buff_head pending;
1064         int filtered = 0, buffered = 0, ac;
1065         unsigned long flags;
1066 
1067         clear_sta_flag(sta, WLAN_STA_SP);
1068 
1069         BUILD_BUG_ON(BITS_TO_LONGS(IEEE80211_NUM_TIDS) > 1);
1070         sta->driver_buffered_tids = 0;
1071 
1072         if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1073                 drv_sta_notify(local, sdata, STA_NOTIFY_AWAKE, &sta->sta);
1074 
1075         skb_queue_head_init(&pending);
1076 
1077         /* sync with ieee80211_tx_h_unicast_ps_buf */
1078         spin_lock(&sta->ps_lock);
1079         /* Send all buffered frames to the station */
1080         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1081                 int count = skb_queue_len(&pending), tmp;
1082 
1083                 spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
1084                 skb_queue_splice_tail_init(&sta->tx_filtered[ac], &pending);
1085                 spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
1086                 tmp = skb_queue_len(&pending);
1087                 filtered += tmp - count;
1088                 count = tmp;
1089 
1090                 spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
1091                 skb_queue_splice_tail_init(&sta->ps_tx_buf[ac], &pending);
1092                 spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
1093                 tmp = skb_queue_len(&pending);
1094                 buffered += tmp - count;
1095         }
1096 
1097         ieee80211_add_pending_skbs_fn(local, &pending, clear_sta_ps_flags, sta);
1098         spin_unlock(&sta->ps_lock);
1099 
1100         /* This station just woke up and isn't aware of our SMPS state */
1101         if (!ieee80211_smps_is_restrictive(sta->known_smps_mode,
1102                                            sdata->smps_mode) &&
1103             sta->known_smps_mode != sdata->bss->req_smps &&
1104             sta_info_tx_streams(sta) != 1) {
1105                 ht_dbg(sdata,
1106                        "%pM just woke up and MIMO capable - update SMPS\n",
1107                        sta->sta.addr);
1108                 ieee80211_send_smps_action(sdata, sdata->bss->req_smps,
1109                                            sta->sta.addr,
1110                                            sdata->vif.bss_conf.bssid);
1111         }
1112 
1113         local->total_ps_buffered -= buffered;
1114 
1115         sta_info_recalc_tim(sta);
1116 
1117         ps_dbg(sdata,
1118                "STA %pM aid %d sending %d filtered/%d PS frames since STA not sleeping anymore\n",
1119                sta->sta.addr, sta->sta.aid, filtered, buffered);
1120 }
1121 
1122 static void ieee80211_send_null_response(struct ieee80211_sub_if_data *sdata,
1123                                          struct sta_info *sta, int tid,
1124                                          enum ieee80211_frame_release_type reason)
1125 {
1126         struct ieee80211_local *local = sdata->local;
1127         struct ieee80211_qos_hdr *nullfunc;
1128         struct sk_buff *skb;
1129         int size = sizeof(*nullfunc);
1130         __le16 fc;
1131         bool qos = test_sta_flag(sta, WLAN_STA_WME);
1132         struct ieee80211_tx_info *info;
1133         struct ieee80211_chanctx_conf *chanctx_conf;
1134 
1135         if (qos) {
1136                 fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1137                                  IEEE80211_STYPE_QOS_NULLFUNC |
1138                                  IEEE80211_FCTL_FROMDS);
1139         } else {
1140                 size -= 2;
1141                 fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1142                                  IEEE80211_STYPE_NULLFUNC |
1143                                  IEEE80211_FCTL_FROMDS);
1144         }
1145 
1146         skb = dev_alloc_skb(local->hw.extra_tx_headroom + size);
1147         if (!skb)
1148                 return;
1149 
1150         skb_reserve(skb, local->hw.extra_tx_headroom);
1151 
1152         nullfunc = (void *) skb_put(skb, size);
1153         nullfunc->frame_control = fc;
1154         nullfunc->duration_id = 0;
1155         memcpy(nullfunc->addr1, sta->sta.addr, ETH_ALEN);
1156         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
1157         memcpy(nullfunc->addr3, sdata->vif.addr, ETH_ALEN);
1158         nullfunc->seq_ctrl = 0;
1159 
1160         skb->priority = tid;
1161         skb_set_queue_mapping(skb, ieee802_1d_to_ac[tid]);
1162         if (qos) {
1163                 nullfunc->qos_ctrl = cpu_to_le16(tid);
1164 
1165                 if (reason == IEEE80211_FRAME_RELEASE_UAPSD)
1166                         nullfunc->qos_ctrl |=
1167                                 cpu_to_le16(IEEE80211_QOS_CTL_EOSP);
1168         }
1169 
1170         info = IEEE80211_SKB_CB(skb);
1171 
1172         /*
1173          * Tell TX path to send this frame even though the
1174          * STA may still remain is PS mode after this frame
1175          * exchange. Also set EOSP to indicate this packet
1176          * ends the poll/service period.
1177          */
1178         info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER |
1179                        IEEE80211_TX_CTL_PS_RESPONSE |
1180                        IEEE80211_TX_STATUS_EOSP |
1181                        IEEE80211_TX_CTL_REQ_TX_STATUS;
1182 
1183         drv_allow_buffered_frames(local, sta, BIT(tid), 1, reason, false);
1184 
1185         skb->dev = sdata->dev;
1186 
1187         rcu_read_lock();
1188         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1189         if (WARN_ON(!chanctx_conf)) {
1190                 rcu_read_unlock();
1191                 kfree_skb(skb);
1192                 return;
1193         }
1194 
1195         ieee80211_xmit(sdata, skb, chanctx_conf->def.chan->band);
1196         rcu_read_unlock();
1197 }
1198 
1199 static void
1200 ieee80211_sta_ps_deliver_response(struct sta_info *sta,
1201                                   int n_frames, u8 ignored_acs,
1202                                   enum ieee80211_frame_release_type reason)
1203 {
1204         struct ieee80211_sub_if_data *sdata = sta->sdata;
1205         struct ieee80211_local *local = sdata->local;
1206         bool found = false;
1207         bool more_data = false;
1208         int ac;
1209         unsigned long driver_release_tids = 0;
1210         struct sk_buff_head frames;
1211 
1212         /* Service or PS-Poll period starts */
1213         set_sta_flag(sta, WLAN_STA_SP);
1214 
1215         __skb_queue_head_init(&frames);
1216 
1217         /*
1218          * Get response frame(s) and more data bit for it.
1219          */
1220         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1221                 unsigned long tids;
1222 
1223                 if (ignored_acs & BIT(ac))
1224                         continue;
1225 
1226                 tids = ieee80211_tids_for_ac(ac);
1227 
1228                 if (!found) {
1229                         driver_release_tids = sta->driver_buffered_tids & tids;
1230                         if (driver_release_tids) {
1231                                 found = true;
1232                         } else {
1233                                 struct sk_buff *skb;
1234 
1235                                 while (n_frames > 0) {
1236                                         skb = skb_dequeue(&sta->tx_filtered[ac]);
1237                                         if (!skb) {
1238                                                 skb = skb_dequeue(
1239                                                         &sta->ps_tx_buf[ac]);
1240                                                 if (skb)
1241                                                         local->total_ps_buffered--;
1242                                         }
1243                                         if (!skb)
1244                                                 break;
1245                                         n_frames--;
1246                                         found = true;
1247                                         __skb_queue_tail(&frames, skb);
1248                                 }
1249                         }
1250 
1251                         /*
1252                          * If the driver has data on more than one TID then
1253                          * certainly there's more data if we release just a
1254                          * single frame now (from a single TID).
1255                          */
1256                         if (reason == IEEE80211_FRAME_RELEASE_PSPOLL &&
1257                             hweight16(driver_release_tids) > 1) {
1258                                 more_data = true;
1259                                 driver_release_tids =
1260                                         BIT(ffs(driver_release_tids) - 1);
1261                                 break;
1262                         }
1263                 }
1264 
1265                 if (!skb_queue_empty(&sta->tx_filtered[ac]) ||
1266                     !skb_queue_empty(&sta->ps_tx_buf[ac])) {
1267                         more_data = true;
1268                         break;
1269                 }
1270         }
1271 
1272         if (!found) {
1273                 int tid;
1274 
1275                 /*
1276                  * For PS-Poll, this can only happen due to a race condition
1277                  * when we set the TIM bit and the station notices it, but
1278                  * before it can poll for the frame we expire it.
1279                  *
1280                  * For uAPSD, this is said in the standard (11.2.1.5 h):
1281                  *      At each unscheduled SP for a non-AP STA, the AP shall
1282                  *      attempt to transmit at least one MSDU or MMPDU, but no
1283                  *      more than the value specified in the Max SP Length field
1284                  *      in the QoS Capability element from delivery-enabled ACs,
1285                  *      that are destined for the non-AP STA.
1286                  *
1287                  * Since we have no other MSDU/MMPDU, transmit a QoS null frame.
1288                  */
1289 
1290                 /* This will evaluate to 1, 3, 5 or 7. */
1291                 tid = 7 - ((ffs(~ignored_acs) - 1) << 1);
1292 
1293                 ieee80211_send_null_response(sdata, sta, tid, reason);
1294                 return;
1295         }
1296 
1297         if (!driver_release_tids) {
1298                 struct sk_buff_head pending;
1299                 struct sk_buff *skb;
1300                 int num = 0;
1301                 u16 tids = 0;
1302 
1303                 skb_queue_head_init(&pending);
1304 
1305                 while ((skb = __skb_dequeue(&frames))) {
1306                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1307                         struct ieee80211_hdr *hdr = (void *) skb->data;
1308                         u8 *qoshdr = NULL;
1309 
1310                         num++;
1311 
1312                         /*
1313                          * Tell TX path to send this frame even though the
1314                          * STA may still remain is PS mode after this frame
1315                          * exchange.
1316                          */
1317                         info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER |
1318                                        IEEE80211_TX_CTL_PS_RESPONSE;
1319 
1320                         /*
1321                          * Use MoreData flag to indicate whether there are
1322                          * more buffered frames for this STA
1323                          */
1324                         if (more_data || !skb_queue_empty(&frames))
1325                                 hdr->frame_control |=
1326                                         cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1327                         else
1328                                 hdr->frame_control &=
1329                                         cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
1330 
1331                         if (ieee80211_is_data_qos(hdr->frame_control) ||
1332                             ieee80211_is_qos_nullfunc(hdr->frame_control))
1333                                 qoshdr = ieee80211_get_qos_ctl(hdr);
1334 
1335                         /* end service period after last frame */
1336                         if (skb_queue_empty(&frames)) {
1337                                 if (reason == IEEE80211_FRAME_RELEASE_UAPSD &&
1338                                     qoshdr)
1339                                         *qoshdr |= IEEE80211_QOS_CTL_EOSP;
1340 
1341                                 info->flags |= IEEE80211_TX_STATUS_EOSP |
1342                                                IEEE80211_TX_CTL_REQ_TX_STATUS;
1343                         }
1344 
1345                         if (qoshdr)
1346                                 tids |= BIT(*qoshdr & IEEE80211_QOS_CTL_TID_MASK);
1347                         else
1348                                 tids |= BIT(0);
1349 
1350                         __skb_queue_tail(&pending, skb);
1351                 }
1352 
1353                 drv_allow_buffered_frames(local, sta, tids, num,
1354                                           reason, more_data);
1355 
1356                 ieee80211_add_pending_skbs(local, &pending);
1357 
1358                 sta_info_recalc_tim(sta);
1359         } else {
1360                 /*
1361                  * We need to release a frame that is buffered somewhere in the
1362                  * driver ... it'll have to handle that.
1363                  * Note that, as per the comment above, it'll also have to see
1364                  * if there is more than just one frame on the specific TID that
1365                  * we're releasing from, and it needs to set the more-data bit
1366                  * accordingly if we tell it that there's no more data. If we do
1367                  * tell it there's more data, then of course the more-data bit
1368                  * needs to be set anyway.
1369                  */
1370                 drv_release_buffered_frames(local, sta, driver_release_tids,
1371                                             n_frames, reason, more_data);
1372 
1373                 /*
1374                  * Note that we don't recalculate the TIM bit here as it would
1375                  * most likely have no effect at all unless the driver told us
1376                  * that the TID became empty before returning here from the
1377                  * release function.
1378                  * Either way, however, when the driver tells us that the TID
1379                  * became empty we'll do the TIM recalculation.
1380                  */
1381         }
1382 }
1383 
1384 void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta)
1385 {
1386         u8 ignore_for_response = sta->sta.uapsd_queues;
1387 
1388         /*
1389          * If all ACs are delivery-enabled then we should reply
1390          * from any of them, if only some are enabled we reply
1391          * only from the non-enabled ones.
1392          */
1393         if (ignore_for_response == BIT(IEEE80211_NUM_ACS) - 1)
1394                 ignore_for_response = 0;
1395 
1396         ieee80211_sta_ps_deliver_response(sta, 1, ignore_for_response,
1397                                           IEEE80211_FRAME_RELEASE_PSPOLL);
1398 }
1399 
1400 void ieee80211_sta_ps_deliver_uapsd(struct sta_info *sta)
1401 {
1402         int n_frames = sta->sta.max_sp;
1403         u8 delivery_enabled = sta->sta.uapsd_queues;
1404 
1405         /*
1406          * If we ever grow support for TSPEC this might happen if
1407          * the TSPEC update from hostapd comes in between a trigger
1408          * frame setting WLAN_STA_UAPSD in the RX path and this
1409          * actually getting called.
1410          */
1411         if (!delivery_enabled)
1412                 return;
1413 
1414         switch (sta->sta.max_sp) {
1415         case 1:
1416                 n_frames = 2;
1417                 break;
1418         case 2:
1419                 n_frames = 4;
1420                 break;
1421         case 3:
1422                 n_frames = 6;
1423                 break;
1424         case 0:
1425                 /* XXX: what is a good value? */
1426                 n_frames = 8;
1427                 break;
1428         }
1429 
1430         ieee80211_sta_ps_deliver_response(sta, n_frames, ~delivery_enabled,
1431                                           IEEE80211_FRAME_RELEASE_UAPSD);
1432 }
1433 
1434 void ieee80211_sta_block_awake(struct ieee80211_hw *hw,
1435                                struct ieee80211_sta *pubsta, bool block)
1436 {
1437         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1438 
1439         trace_api_sta_block_awake(sta->local, pubsta, block);
1440 
1441         if (block)
1442                 set_sta_flag(sta, WLAN_STA_PS_DRIVER);
1443         else if (test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1444                 ieee80211_queue_work(hw, &sta->drv_unblock_wk);
1445 }
1446 EXPORT_SYMBOL(ieee80211_sta_block_awake);
1447 
1448 void ieee80211_sta_eosp(struct ieee80211_sta *pubsta)
1449 {
1450         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1451         struct ieee80211_local *local = sta->local;
1452 
1453         trace_api_eosp(local, pubsta);
1454 
1455         clear_sta_flag(sta, WLAN_STA_SP);
1456 }
1457 EXPORT_SYMBOL(ieee80211_sta_eosp);
1458 
1459 void ieee80211_sta_set_buffered(struct ieee80211_sta *pubsta,
1460                                 u8 tid, bool buffered)
1461 {
1462         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1463 
1464         if (WARN_ON(tid >= IEEE80211_NUM_TIDS))
1465                 return;
1466 
1467         if (buffered)
1468                 set_bit(tid, &sta->driver_buffered_tids);
1469         else
1470                 clear_bit(tid, &sta->driver_buffered_tids);
1471 
1472         sta_info_recalc_tim(sta);
1473 }
1474 EXPORT_SYMBOL(ieee80211_sta_set_buffered);
1475 
1476 int sta_info_move_state(struct sta_info *sta,
1477                         enum ieee80211_sta_state new_state)
1478 {
1479         might_sleep();
1480 
1481         if (sta->sta_state == new_state)
1482                 return 0;
1483 
1484         /* check allowed transitions first */
1485 
1486         switch (new_state) {
1487         case IEEE80211_STA_NONE:
1488                 if (sta->sta_state != IEEE80211_STA_AUTH)
1489                         return -EINVAL;
1490                 break;
1491         case IEEE80211_STA_AUTH:
1492                 if (sta->sta_state != IEEE80211_STA_NONE &&
1493                     sta->sta_state != IEEE80211_STA_ASSOC)
1494                         return -EINVAL;
1495                 break;
1496         case IEEE80211_STA_ASSOC:
1497                 if (sta->sta_state != IEEE80211_STA_AUTH &&
1498                     sta->sta_state != IEEE80211_STA_AUTHORIZED)
1499                         return -EINVAL;
1500                 break;
1501         case IEEE80211_STA_AUTHORIZED:
1502                 if (sta->sta_state != IEEE80211_STA_ASSOC)
1503                         return -EINVAL;
1504                 break;
1505         default:
1506                 WARN(1, "invalid state %d", new_state);
1507                 return -EINVAL;
1508         }
1509 
1510         sta_dbg(sta->sdata, "moving STA %pM to state %d\n",
1511                 sta->sta.addr, new_state);
1512 
1513         /*
1514          * notify the driver before the actual changes so it can
1515          * fail the transition
1516          */
1517         if (test_sta_flag(sta, WLAN_STA_INSERTED)) {
1518                 int err = drv_sta_state(sta->local, sta->sdata, sta,
1519                                         sta->sta_state, new_state);
1520                 if (err)
1521                         return err;
1522         }
1523 
1524         /* reflect the change in all state variables */
1525 
1526         switch (new_state) {
1527         case IEEE80211_STA_NONE:
1528                 if (sta->sta_state == IEEE80211_STA_AUTH)
1529                         clear_bit(WLAN_STA_AUTH, &sta->_flags);
1530                 break;
1531         case IEEE80211_STA_AUTH:
1532                 if (sta->sta_state == IEEE80211_STA_NONE)
1533                         set_bit(WLAN_STA_AUTH, &sta->_flags);
1534                 else if (sta->sta_state == IEEE80211_STA_ASSOC)
1535                         clear_bit(WLAN_STA_ASSOC, &sta->_flags);
1536                 break;
1537         case IEEE80211_STA_ASSOC:
1538                 if (sta->sta_state == IEEE80211_STA_AUTH) {
1539                         set_bit(WLAN_STA_ASSOC, &sta->_flags);
1540                 } else if (sta->sta_state == IEEE80211_STA_AUTHORIZED) {
1541                         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1542                             (sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1543                              !sta->sdata->u.vlan.sta))
1544                                 atomic_dec(&sta->sdata->bss->num_mcast_sta);
1545                         clear_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
1546                 }
1547                 break;
1548         case IEEE80211_STA_AUTHORIZED:
1549                 if (sta->sta_state == IEEE80211_STA_ASSOC) {
1550                         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1551                             (sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1552                              !sta->sdata->u.vlan.sta))
1553                                 atomic_inc(&sta->sdata->bss->num_mcast_sta);
1554                         set_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
1555                 }
1556                 break;
1557         default:
1558                 break;
1559         }
1560 
1561         sta->sta_state = new_state;
1562 
1563         return 0;
1564 }
1565 
1566 u8 sta_info_tx_streams(struct sta_info *sta)
1567 {
1568         struct ieee80211_sta_ht_cap *ht_cap = &sta->sta.ht_cap;
1569         u8 rx_streams;
1570 
1571         if (!sta->sta.ht_cap.ht_supported)
1572                 return 1;
1573 
1574         if (sta->sta.vht_cap.vht_supported) {
1575                 int i;
1576                 u16 tx_mcs_map =
1577                         le16_to_cpu(sta->sta.vht_cap.vht_mcs.tx_mcs_map);
1578 
1579                 for (i = 7; i >= 0; i--)
1580                         if ((tx_mcs_map & (0x3 << (i * 2))) !=
1581                             IEEE80211_VHT_MCS_NOT_SUPPORTED)
1582                                 return i + 1;
1583         }
1584 
1585         if (ht_cap->mcs.rx_mask[3])
1586                 rx_streams = 4;
1587         else if (ht_cap->mcs.rx_mask[2])
1588                 rx_streams = 3;
1589         else if (ht_cap->mcs.rx_mask[1])
1590                 rx_streams = 2;
1591         else
1592                 rx_streams = 1;
1593 
1594         if (!(ht_cap->mcs.tx_params & IEEE80211_HT_MCS_TX_RX_DIFF))
1595                 return rx_streams;
1596 
1597         return ((ht_cap->mcs.tx_params & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
1598                         >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1;
1599 }
1600 

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