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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                 tid_tx = rcu_dereference_raw(sta->ampdu_mlme.tid_tx[i]);
153                 if (!tid_tx)
154                         continue;
155                 ieee80211_purge_tx_queue(&local->hw, &tid_tx->pending);
156                 kfree(tid_tx);
157         }
158 
159         sta_info_free(local, sta);
160 }
161 
162 void ieee80211_cleanup_sdata_stas(struct ieee80211_sub_if_data *sdata)
163 {
164         struct sta_info *sta;
165 
166         spin_lock_bh(&sdata->cleanup_stations_lock);
167         while (!list_empty(&sdata->cleanup_stations)) {
168                 sta = list_first_entry(&sdata->cleanup_stations,
169                                        struct sta_info, list);
170                 list_del(&sta->list);
171                 spin_unlock_bh(&sdata->cleanup_stations_lock);
172 
173                 cleanup_single_sta(sta);
174 
175                 spin_lock_bh(&sdata->cleanup_stations_lock);
176         }
177 
178         spin_unlock_bh(&sdata->cleanup_stations_lock);
179 }
180 
181 static void free_sta_rcu(struct rcu_head *h)
182 {
183         struct sta_info *sta = container_of(h, struct sta_info, rcu_head);
184         struct ieee80211_sub_if_data *sdata = sta->sdata;
185 
186         spin_lock(&sdata->cleanup_stations_lock);
187         list_add_tail(&sta->list, &sdata->cleanup_stations);
188         spin_unlock(&sdata->cleanup_stations_lock);
189 
190         ieee80211_queue_work(&sdata->local->hw, &sdata->cleanup_stations_wk);
191 }
192 
193 /* protected by RCU */
194 struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata,
195                               const u8 *addr)
196 {
197         struct ieee80211_local *local = sdata->local;
198         struct sta_info *sta;
199 
200         sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)],
201                                     lockdep_is_held(&local->sta_mtx));
202         while (sta) {
203                 if (sta->sdata == sdata &&
204                     ether_addr_equal(sta->sta.addr, addr))
205                         break;
206                 sta = rcu_dereference_check(sta->hnext,
207                                             lockdep_is_held(&local->sta_mtx));
208         }
209         return sta;
210 }
211 
212 /*
213  * Get sta info either from the specified interface
214  * or from one of its vlans
215  */
216 struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata,
217                                   const u8 *addr)
218 {
219         struct ieee80211_local *local = sdata->local;
220         struct sta_info *sta;
221 
222         sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)],
223                                     lockdep_is_held(&local->sta_mtx));
224         while (sta) {
225                 if ((sta->sdata == sdata ||
226                      (sta->sdata->bss && sta->sdata->bss == sdata->bss)) &&
227                     ether_addr_equal(sta->sta.addr, addr))
228                         break;
229                 sta = rcu_dereference_check(sta->hnext,
230                                             lockdep_is_held(&local->sta_mtx));
231         }
232         return sta;
233 }
234 
235 struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
236                                      int idx)
237 {
238         struct ieee80211_local *local = sdata->local;
239         struct sta_info *sta;
240         int i = 0;
241 
242         list_for_each_entry_rcu(sta, &local->sta_list, list) {
243                 if (sdata != sta->sdata)
244                         continue;
245                 if (i < idx) {
246                         ++i;
247                         continue;
248                 }
249                 return sta;
250         }
251 
252         return NULL;
253 }
254 
255 /**
256  * sta_info_free - free STA
257  *
258  * @local: pointer to the global information
259  * @sta: STA info to free
260  *
261  * This function must undo everything done by sta_info_alloc()
262  * that may happen before sta_info_insert(). It may only be
263  * called when sta_info_insert() has not been attempted (and
264  * if that fails, the station is freed anyway.)
265  */
266 void sta_info_free(struct ieee80211_local *local, struct sta_info *sta)
267 {
268         if (sta->rate_ctrl)
269                 rate_control_free_sta(sta);
270 
271         sta_dbg(sta->sdata, "Destroyed STA %pM\n", sta->sta.addr);
272 
273         kfree(rcu_dereference_raw(sta->sta.rates));
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 #endif
352 
353         memcpy(sta->sta.addr, addr, ETH_ALEN);
354         sta->local = local;
355         sta->sdata = sdata;
356         sta->last_rx = jiffies;
357 
358         sta->sta_state = IEEE80211_STA_NONE;
359 
360         do_posix_clock_monotonic_gettime(&uptime);
361         sta->last_connected = uptime.tv_sec;
362         ewma_init(&sta->avg_signal, 1024, 8);
363 
364         if (sta_prepare_rate_control(local, sta, gfp)) {
365                 kfree(sta);
366                 return NULL;
367         }
368 
369         for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
370                 /*
371                  * timer_to_tid must be initialized with identity mapping
372                  * to enable session_timer's data differentiation. See
373                  * sta_rx_agg_session_timer_expired for usage.
374                  */
375                 sta->timer_to_tid[i] = i;
376         }
377         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
378                 skb_queue_head_init(&sta->ps_tx_buf[i]);
379                 skb_queue_head_init(&sta->tx_filtered[i]);
380         }
381 
382         for (i = 0; i < IEEE80211_NUM_TIDS; i++)
383                 sta->last_seq_ctrl[i] = cpu_to_le16(USHRT_MAX);
384 
385         sta->sta.smps_mode = IEEE80211_SMPS_OFF;
386 
387         sta_dbg(sdata, "Allocated STA %pM\n", sta->sta.addr);
388 
389         return sta;
390 }
391 
392 static int sta_info_insert_check(struct sta_info *sta)
393 {
394         struct ieee80211_sub_if_data *sdata = sta->sdata;
395 
396         /*
397          * Can't be a WARN_ON because it can be triggered through a race:
398          * something inserts a STA (on one CPU) without holding the RTNL
399          * and another CPU turns off the net device.
400          */
401         if (unlikely(!ieee80211_sdata_running(sdata)))
402                 return -ENETDOWN;
403 
404         if (WARN_ON(ether_addr_equal(sta->sta.addr, sdata->vif.addr) ||
405                     is_multicast_ether_addr(sta->sta.addr)))
406                 return -EINVAL;
407 
408         return 0;
409 }
410 
411 static int sta_info_insert_drv_state(struct ieee80211_local *local,
412                                      struct ieee80211_sub_if_data *sdata,
413                                      struct sta_info *sta)
414 {
415         enum ieee80211_sta_state state;
416         int err = 0;
417 
418         for (state = IEEE80211_STA_NOTEXIST; state < sta->sta_state; state++) {
419                 err = drv_sta_state(local, sdata, sta, state, state + 1);
420                 if (err)
421                         break;
422         }
423 
424         if (!err) {
425                 /*
426                  * Drivers using legacy sta_add/sta_remove callbacks only
427                  * get uploaded set to true after sta_add is called.
428                  */
429                 if (!local->ops->sta_add)
430                         sta->uploaded = true;
431                 return 0;
432         }
433 
434         if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
435                 sdata_info(sdata,
436                            "failed to move IBSS STA %pM to state %d (%d) - keeping it anyway\n",
437                            sta->sta.addr, state + 1, err);
438                 err = 0;
439         }
440 
441         /* unwind on error */
442         for (; state > IEEE80211_STA_NOTEXIST; state--)
443                 WARN_ON(drv_sta_state(local, sdata, sta, state, state - 1));
444 
445         return err;
446 }
447 
448 /*
449  * should be called with sta_mtx locked
450  * this function replaces the mutex lock
451  * with a RCU lock
452  */
453 static int sta_info_insert_finish(struct sta_info *sta) __acquires(RCU)
454 {
455         struct ieee80211_local *local = sta->local;
456         struct ieee80211_sub_if_data *sdata = sta->sdata;
457         struct station_info sinfo;
458         int err = 0;
459 
460         lockdep_assert_held(&local->sta_mtx);
461 
462         /* check if STA exists already */
463         if (sta_info_get_bss(sdata, sta->sta.addr)) {
464                 err = -EEXIST;
465                 goto out_err;
466         }
467 
468         /* notify driver */
469         err = sta_info_insert_drv_state(local, sdata, sta);
470         if (err)
471                 goto out_err;
472 
473         local->num_sta++;
474         local->sta_generation++;
475         smp_mb();
476 
477         /* make the station visible */
478         sta_info_hash_add(local, sta);
479 
480         list_add_rcu(&sta->list, &local->sta_list);
481 
482         set_sta_flag(sta, WLAN_STA_INSERTED);
483 
484         ieee80211_sta_debugfs_add(sta);
485         rate_control_add_sta_debugfs(sta);
486 
487         memset(&sinfo, 0, sizeof(sinfo));
488         sinfo.filled = 0;
489         sinfo.generation = local->sta_generation;
490         cfg80211_new_sta(sdata->dev, sta->sta.addr, &sinfo, GFP_KERNEL);
491 
492         sta_dbg(sdata, "Inserted STA %pM\n", sta->sta.addr);
493 
494         /* move reference to rcu-protected */
495         rcu_read_lock();
496         mutex_unlock(&local->sta_mtx);
497 
498         if (ieee80211_vif_is_mesh(&sdata->vif))
499                 mesh_accept_plinks_update(sdata);
500 
501         return 0;
502  out_err:
503         mutex_unlock(&local->sta_mtx);
504         rcu_read_lock();
505         return err;
506 }
507 
508 int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU)
509 {
510         struct ieee80211_local *local = sta->local;
511         int err = 0;
512 
513         might_sleep();
514 
515         err = sta_info_insert_check(sta);
516         if (err) {
517                 rcu_read_lock();
518                 goto out_free;
519         }
520 
521         mutex_lock(&local->sta_mtx);
522 
523         err = sta_info_insert_finish(sta);
524         if (err)
525                 goto out_free;
526 
527         return 0;
528  out_free:
529         BUG_ON(!err);
530         sta_info_free(local, sta);
531         return err;
532 }
533 
534 int sta_info_insert(struct sta_info *sta)
535 {
536         int err = sta_info_insert_rcu(sta);
537 
538         rcu_read_unlock();
539 
540         return err;
541 }
542 
543 static inline void __bss_tim_set(u8 *tim, u16 id)
544 {
545         /*
546          * This format has been mandated by the IEEE specifications,
547          * so this line may not be changed to use the __set_bit() format.
548          */
549         tim[id / 8] |= (1 << (id % 8));
550 }
551 
552 static inline void __bss_tim_clear(u8 *tim, u16 id)
553 {
554         /*
555          * This format has been mandated by the IEEE specifications,
556          * so this line may not be changed to use the __clear_bit() format.
557          */
558         tim[id / 8] &= ~(1 << (id % 8));
559 }
560 
561 static inline bool __bss_tim_get(u8 *tim, u16 id)
562 {
563         /*
564          * This format has been mandated by the IEEE specifications,
565          * so this line may not be changed to use the test_bit() format.
566          */
567         return tim[id / 8] & (1 << (id % 8));
568 }
569 
570 static unsigned long ieee80211_tids_for_ac(int ac)
571 {
572         /* If we ever support TIDs > 7, this obviously needs to be adjusted */
573         switch (ac) {
574         case IEEE80211_AC_VO:
575                 return BIT(6) | BIT(7);
576         case IEEE80211_AC_VI:
577                 return BIT(4) | BIT(5);
578         case IEEE80211_AC_BE:
579                 return BIT(0) | BIT(3);
580         case IEEE80211_AC_BK:
581                 return BIT(1) | BIT(2);
582         default:
583                 WARN_ON(1);
584                 return 0;
585         }
586 }
587 
588 void sta_info_recalc_tim(struct sta_info *sta)
589 {
590         struct ieee80211_local *local = sta->local;
591         struct ps_data *ps;
592         bool indicate_tim = false;
593         u8 ignore_for_tim = sta->sta.uapsd_queues;
594         int ac;
595         u16 id;
596 
597         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
598             sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
599                 if (WARN_ON_ONCE(!sta->sdata->bss))
600                         return;
601 
602                 ps = &sta->sdata->bss->ps;
603                 id = sta->sta.aid;
604 #ifdef CONFIG_MAC80211_MESH
605         } else if (ieee80211_vif_is_mesh(&sta->sdata->vif)) {
606                 ps = &sta->sdata->u.mesh.ps;
607                 /* TIM map only for PLID <= IEEE80211_MAX_AID */
608                 id = le16_to_cpu(sta->plid) % IEEE80211_MAX_AID;
609 #endif
610         } else {
611                 return;
612         }
613 
614         /* No need to do anything if the driver does all */
615         if (local->hw.flags & IEEE80211_HW_AP_LINK_PS)
616                 return;
617 
618         if (sta->dead)
619                 goto done;
620 
621         /*
622          * If all ACs are delivery-enabled then we should build
623          * the TIM bit for all ACs anyway; if only some are then
624          * we ignore those and build the TIM bit using only the
625          * non-enabled ones.
626          */
627         if (ignore_for_tim == BIT(IEEE80211_NUM_ACS) - 1)
628                 ignore_for_tim = 0;
629 
630         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
631                 unsigned long tids;
632 
633                 if (ignore_for_tim & BIT(ac))
634                         continue;
635 
636                 indicate_tim |= !skb_queue_empty(&sta->tx_filtered[ac]) ||
637                                 !skb_queue_empty(&sta->ps_tx_buf[ac]);
638                 if (indicate_tim)
639                         break;
640 
641                 tids = ieee80211_tids_for_ac(ac);
642 
643                 indicate_tim |=
644                         sta->driver_buffered_tids & tids;
645         }
646 
647  done:
648         spin_lock_bh(&local->tim_lock);
649 
650         if (indicate_tim == __bss_tim_get(ps->tim, id))
651                 goto out_unlock;
652 
653         if (indicate_tim)
654                 __bss_tim_set(ps->tim, id);
655         else
656                 __bss_tim_clear(ps->tim, id);
657 
658         if (local->ops->set_tim) {
659                 local->tim_in_locked_section = true;
660                 drv_set_tim(local, &sta->sta, indicate_tim);
661                 local->tim_in_locked_section = false;
662         }
663 
664 out_unlock:
665         spin_unlock_bh(&local->tim_lock);
666 }
667 
668 static bool sta_info_buffer_expired(struct sta_info *sta, struct sk_buff *skb)
669 {
670         struct ieee80211_tx_info *info;
671         int timeout;
672 
673         if (!skb)
674                 return false;
675 
676         info = IEEE80211_SKB_CB(skb);
677 
678         /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
679         timeout = (sta->listen_interval *
680                    sta->sdata->vif.bss_conf.beacon_int *
681                    32 / 15625) * HZ;
682         if (timeout < STA_TX_BUFFER_EXPIRE)
683                 timeout = STA_TX_BUFFER_EXPIRE;
684         return time_after(jiffies, info->control.jiffies + timeout);
685 }
686 
687 
688 static bool sta_info_cleanup_expire_buffered_ac(struct ieee80211_local *local,
689                                                 struct sta_info *sta, int ac)
690 {
691         unsigned long flags;
692         struct sk_buff *skb;
693 
694         /*
695          * First check for frames that should expire on the filtered
696          * queue. Frames here were rejected by the driver and are on
697          * a separate queue to avoid reordering with normal PS-buffered
698          * frames. They also aren't accounted for right now in the
699          * total_ps_buffered counter.
700          */
701         for (;;) {
702                 spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
703                 skb = skb_peek(&sta->tx_filtered[ac]);
704                 if (sta_info_buffer_expired(sta, skb))
705                         skb = __skb_dequeue(&sta->tx_filtered[ac]);
706                 else
707                         skb = NULL;
708                 spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
709 
710                 /*
711                  * Frames are queued in order, so if this one
712                  * hasn't expired yet we can stop testing. If
713                  * we actually reached the end of the queue we
714                  * also need to stop, of course.
715                  */
716                 if (!skb)
717                         break;
718                 ieee80211_free_txskb(&local->hw, skb);
719         }
720 
721         /*
722          * Now also check the normal PS-buffered queue, this will
723          * only find something if the filtered queue was emptied
724          * since the filtered frames are all before the normal PS
725          * buffered frames.
726          */
727         for (;;) {
728                 spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
729                 skb = skb_peek(&sta->ps_tx_buf[ac]);
730                 if (sta_info_buffer_expired(sta, skb))
731                         skb = __skb_dequeue(&sta->ps_tx_buf[ac]);
732                 else
733                         skb = NULL;
734                 spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
735 
736                 /*
737                  * frames are queued in order, so if this one
738                  * hasn't expired yet (or we reached the end of
739                  * the queue) we can stop testing
740                  */
741                 if (!skb)
742                         break;
743 
744                 local->total_ps_buffered--;
745                 ps_dbg(sta->sdata, "Buffered frame expired (STA %pM)\n",
746                        sta->sta.addr);
747                 ieee80211_free_txskb(&local->hw, skb);
748         }
749 
750         /*
751          * Finally, recalculate the TIM bit for this station -- it might
752          * now be clear because the station was too slow to retrieve its
753          * frames.
754          */
755         sta_info_recalc_tim(sta);
756 
757         /*
758          * Return whether there are any frames still buffered, this is
759          * used to check whether the cleanup timer still needs to run,
760          * if there are no frames we don't need to rearm the timer.
761          */
762         return !(skb_queue_empty(&sta->ps_tx_buf[ac]) &&
763                  skb_queue_empty(&sta->tx_filtered[ac]));
764 }
765 
766 static bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
767                                              struct sta_info *sta)
768 {
769         bool have_buffered = false;
770         int ac;
771 
772         /* This is only necessary for stations on BSS/MBSS interfaces */
773         if (!sta->sdata->bss &&
774             !ieee80211_vif_is_mesh(&sta->sdata->vif))
775                 return false;
776 
777         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
778                 have_buffered |=
779                         sta_info_cleanup_expire_buffered_ac(local, sta, ac);
780 
781         return have_buffered;
782 }
783 
784 int __must_check __sta_info_destroy(struct sta_info *sta)
785 {
786         struct ieee80211_local *local;
787         struct ieee80211_sub_if_data *sdata;
788         int ret;
789 
790         might_sleep();
791 
792         if (!sta)
793                 return -ENOENT;
794 
795         local = sta->local;
796         sdata = sta->sdata;
797 
798         lockdep_assert_held(&local->sta_mtx);
799 
800         /*
801          * Before removing the station from the driver and
802          * rate control, it might still start new aggregation
803          * sessions -- block that to make sure the tear-down
804          * will be sufficient.
805          */
806         set_sta_flag(sta, WLAN_STA_BLOCK_BA);
807         ieee80211_sta_tear_down_BA_sessions(sta, AGG_STOP_DESTROY_STA);
808 
809         ret = sta_info_hash_del(local, sta);
810         if (ret)
811                 return ret;
812 
813         list_del_rcu(&sta->list);
814 
815         /* this always calls synchronize_net() */
816         ieee80211_free_sta_keys(local, sta);
817 
818         sta->dead = true;
819 
820         local->num_sta--;
821         local->sta_generation++;
822 
823         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
824                 RCU_INIT_POINTER(sdata->u.vlan.sta, NULL);
825 
826         while (sta->sta_state > IEEE80211_STA_NONE) {
827                 ret = sta_info_move_state(sta, sta->sta_state - 1);
828                 if (ret) {
829                         WARN_ON_ONCE(1);
830                         break;
831                 }
832         }
833 
834         if (sta->uploaded) {
835                 ret = drv_sta_state(local, sdata, sta, IEEE80211_STA_NONE,
836                                     IEEE80211_STA_NOTEXIST);
837                 WARN_ON_ONCE(ret != 0);
838         }
839 
840         sta_dbg(sdata, "Removed STA %pM\n", sta->sta.addr);
841 
842         cfg80211_del_sta(sdata->dev, sta->sta.addr, GFP_KERNEL);
843 
844         rate_control_remove_sta_debugfs(sta);
845         ieee80211_sta_debugfs_remove(sta);
846 
847         call_rcu(&sta->rcu_head, free_sta_rcu);
848 
849         return 0;
850 }
851 
852 int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, const u8 *addr)
853 {
854         struct sta_info *sta;
855         int ret;
856 
857         mutex_lock(&sdata->local->sta_mtx);
858         sta = sta_info_get(sdata, addr);
859         ret = __sta_info_destroy(sta);
860         mutex_unlock(&sdata->local->sta_mtx);
861 
862         return ret;
863 }
864 
865 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
866                               const u8 *addr)
867 {
868         struct sta_info *sta;
869         int ret;
870 
871         mutex_lock(&sdata->local->sta_mtx);
872         sta = sta_info_get_bss(sdata, addr);
873         ret = __sta_info_destroy(sta);
874         mutex_unlock(&sdata->local->sta_mtx);
875 
876         return ret;
877 }
878 
879 static void sta_info_cleanup(unsigned long data)
880 {
881         struct ieee80211_local *local = (struct ieee80211_local *) data;
882         struct sta_info *sta;
883         bool timer_needed = false;
884 
885         rcu_read_lock();
886         list_for_each_entry_rcu(sta, &local->sta_list, list)
887                 if (sta_info_cleanup_expire_buffered(local, sta))
888                         timer_needed = true;
889         rcu_read_unlock();
890 
891         if (local->quiescing)
892                 return;
893 
894         if (!timer_needed)
895                 return;
896 
897         mod_timer(&local->sta_cleanup,
898                   round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL));
899 }
900 
901 void sta_info_init(struct ieee80211_local *local)
902 {
903         spin_lock_init(&local->tim_lock);
904         mutex_init(&local->sta_mtx);
905         INIT_LIST_HEAD(&local->sta_list);
906 
907         setup_timer(&local->sta_cleanup, sta_info_cleanup,
908                     (unsigned long)local);
909 }
910 
911 void sta_info_stop(struct ieee80211_local *local)
912 {
913         del_timer_sync(&local->sta_cleanup);
914 }
915 
916 
917 int sta_info_flush_defer(struct ieee80211_sub_if_data *sdata)
918 {
919         struct ieee80211_local *local = sdata->local;
920         struct sta_info *sta, *tmp;
921         int ret = 0;
922 
923         might_sleep();
924 
925         mutex_lock(&local->sta_mtx);
926         list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
927                 if (sdata == sta->sdata) {
928                         WARN_ON(__sta_info_destroy(sta));
929                         ret++;
930                 }
931         }
932         mutex_unlock(&local->sta_mtx);
933 
934         return ret;
935 }
936 
937 void sta_info_flush_cleanup(struct ieee80211_sub_if_data *sdata)
938 {
939         ieee80211_cleanup_sdata_stas(sdata);
940         cancel_work_sync(&sdata->cleanup_stations_wk);
941 }
942 
943 void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
944                           unsigned long exp_time)
945 {
946         struct ieee80211_local *local = sdata->local;
947         struct sta_info *sta, *tmp;
948 
949         mutex_lock(&local->sta_mtx);
950 
951         list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
952                 if (sdata != sta->sdata)
953                         continue;
954 
955                 if (time_after(jiffies, sta->last_rx + exp_time)) {
956                         sta_dbg(sta->sdata, "expiring inactive STA %pM\n",
957                                 sta->sta.addr);
958 
959                         if (ieee80211_vif_is_mesh(&sdata->vif) &&
960                             test_sta_flag(sta, WLAN_STA_PS_STA))
961                                 atomic_dec(&sdata->u.mesh.ps.num_sta_ps);
962 
963                         WARN_ON(__sta_info_destroy(sta));
964                 }
965         }
966 
967         mutex_unlock(&local->sta_mtx);
968 }
969 
970 struct ieee80211_sta *ieee80211_find_sta_by_ifaddr(struct ieee80211_hw *hw,
971                                                const u8 *addr,
972                                                const u8 *localaddr)
973 {
974         struct sta_info *sta, *nxt;
975 
976         /*
977          * Just return a random station if localaddr is NULL
978          * ... first in list.
979          */
980         for_each_sta_info(hw_to_local(hw), addr, sta, nxt) {
981                 if (localaddr &&
982                     !ether_addr_equal(sta->sdata->vif.addr, localaddr))
983                         continue;
984                 if (!sta->uploaded)
985                         return NULL;
986                 return &sta->sta;
987         }
988 
989         return NULL;
990 }
991 EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr);
992 
993 struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif,
994                                          const u8 *addr)
995 {
996         struct sta_info *sta;
997 
998         if (!vif)
999                 return NULL;
1000 
1001         sta = sta_info_get_bss(vif_to_sdata(vif), addr);
1002         if (!sta)
1003                 return NULL;
1004 
1005         if (!sta->uploaded)
1006                 return NULL;
1007 
1008         return &sta->sta;
1009 }
1010 EXPORT_SYMBOL(ieee80211_find_sta);
1011 
1012 static void clear_sta_ps_flags(void *_sta)
1013 {
1014         struct sta_info *sta = _sta;
1015         struct ieee80211_sub_if_data *sdata = sta->sdata;
1016         struct ps_data *ps;
1017 
1018         if (sdata->vif.type == NL80211_IFTYPE_AP ||
1019             sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1020                 ps = &sdata->bss->ps;
1021         else if (ieee80211_vif_is_mesh(&sdata->vif))
1022                 ps = &sdata->u.mesh.ps;
1023         else
1024                 return;
1025 
1026         clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
1027         if (test_and_clear_sta_flag(sta, WLAN_STA_PS_STA))
1028                 atomic_dec(&ps->num_sta_ps);
1029 }
1030 
1031 /* powersave support code */
1032 void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta)
1033 {
1034         struct ieee80211_sub_if_data *sdata = sta->sdata;
1035         struct ieee80211_local *local = sdata->local;
1036         struct sk_buff_head pending;
1037         int filtered = 0, buffered = 0, ac;
1038         unsigned long flags;
1039 
1040         clear_sta_flag(sta, WLAN_STA_SP);
1041 
1042         BUILD_BUG_ON(BITS_TO_LONGS(IEEE80211_NUM_TIDS) > 1);
1043         sta->driver_buffered_tids = 0;
1044 
1045         if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1046                 drv_sta_notify(local, sdata, STA_NOTIFY_AWAKE, &sta->sta);
1047 
1048         skb_queue_head_init(&pending);
1049 
1050         /* sync with ieee80211_tx_h_unicast_ps_buf */
1051         spin_lock(&sta->ps_lock);
1052         /* Send all buffered frames to the station */
1053         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1054                 int count = skb_queue_len(&pending), tmp;
1055 
1056                 spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
1057                 skb_queue_splice_tail_init(&sta->tx_filtered[ac], &pending);
1058                 spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
1059                 tmp = skb_queue_len(&pending);
1060                 filtered += tmp - count;
1061                 count = tmp;
1062 
1063                 spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
1064                 skb_queue_splice_tail_init(&sta->ps_tx_buf[ac], &pending);
1065                 spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
1066                 tmp = skb_queue_len(&pending);
1067                 buffered += tmp - count;
1068         }
1069 
1070         ieee80211_add_pending_skbs_fn(local, &pending, clear_sta_ps_flags, sta);
1071         spin_unlock(&sta->ps_lock);
1072 
1073         local->total_ps_buffered -= buffered;
1074 
1075         sta_info_recalc_tim(sta);
1076 
1077         ps_dbg(sdata,
1078                "STA %pM aid %d sending %d filtered/%d PS frames since STA not sleeping anymore\n",
1079                sta->sta.addr, sta->sta.aid, filtered, buffered);
1080 }
1081 
1082 static void ieee80211_send_null_response(struct ieee80211_sub_if_data *sdata,
1083                                          struct sta_info *sta, int tid,
1084                                          enum ieee80211_frame_release_type reason)
1085 {
1086         struct ieee80211_local *local = sdata->local;
1087         struct ieee80211_qos_hdr *nullfunc;
1088         struct sk_buff *skb;
1089         int size = sizeof(*nullfunc);
1090         __le16 fc;
1091         bool qos = test_sta_flag(sta, WLAN_STA_WME);
1092         struct ieee80211_tx_info *info;
1093         struct ieee80211_chanctx_conf *chanctx_conf;
1094 
1095         if (qos) {
1096                 fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1097                                  IEEE80211_STYPE_QOS_NULLFUNC |
1098                                  IEEE80211_FCTL_FROMDS);
1099         } else {
1100                 size -= 2;
1101                 fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1102                                  IEEE80211_STYPE_NULLFUNC |
1103                                  IEEE80211_FCTL_FROMDS);
1104         }
1105 
1106         skb = dev_alloc_skb(local->hw.extra_tx_headroom + size);
1107         if (!skb)
1108                 return;
1109 
1110         skb_reserve(skb, local->hw.extra_tx_headroom);
1111 
1112         nullfunc = (void *) skb_put(skb, size);
1113         nullfunc->frame_control = fc;
1114         nullfunc->duration_id = 0;
1115         memcpy(nullfunc->addr1, sta->sta.addr, ETH_ALEN);
1116         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
1117         memcpy(nullfunc->addr3, sdata->vif.addr, ETH_ALEN);
1118         nullfunc->seq_ctrl = 0;
1119 
1120         skb->priority = tid;
1121         skb_set_queue_mapping(skb, ieee802_1d_to_ac[tid]);
1122         if (qos) {
1123                 nullfunc->qos_ctrl = cpu_to_le16(tid);
1124 
1125                 if (reason == IEEE80211_FRAME_RELEASE_UAPSD)
1126                         nullfunc->qos_ctrl |=
1127                                 cpu_to_le16(IEEE80211_QOS_CTL_EOSP);
1128         }
1129 
1130         info = IEEE80211_SKB_CB(skb);
1131 
1132         /*
1133          * Tell TX path to send this frame even though the
1134          * STA may still remain is PS mode after this frame
1135          * exchange. Also set EOSP to indicate this packet
1136          * ends the poll/service period.
1137          */
1138         info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER |
1139                        IEEE80211_TX_STATUS_EOSP |
1140                        IEEE80211_TX_CTL_REQ_TX_STATUS;
1141 
1142         drv_allow_buffered_frames(local, sta, BIT(tid), 1, reason, false);
1143 
1144         skb->dev = sdata->dev;
1145 
1146         rcu_read_lock();
1147         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1148         if (WARN_ON(!chanctx_conf)) {
1149                 rcu_read_unlock();
1150                 kfree_skb(skb);
1151                 return;
1152         }
1153 
1154         ieee80211_xmit(sdata, skb, chanctx_conf->def.chan->band);
1155         rcu_read_unlock();
1156 }
1157 
1158 static void
1159 ieee80211_sta_ps_deliver_response(struct sta_info *sta,
1160                                   int n_frames, u8 ignored_acs,
1161                                   enum ieee80211_frame_release_type reason)
1162 {
1163         struct ieee80211_sub_if_data *sdata = sta->sdata;
1164         struct ieee80211_local *local = sdata->local;
1165         bool found = false;
1166         bool more_data = false;
1167         int ac;
1168         unsigned long driver_release_tids = 0;
1169         struct sk_buff_head frames;
1170 
1171         /* Service or PS-Poll period starts */
1172         set_sta_flag(sta, WLAN_STA_SP);
1173 
1174         __skb_queue_head_init(&frames);
1175 
1176         /*
1177          * Get response frame(s) and more data bit for it.
1178          */
1179         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1180                 unsigned long tids;
1181 
1182                 if (ignored_acs & BIT(ac))
1183                         continue;
1184 
1185                 tids = ieee80211_tids_for_ac(ac);
1186 
1187                 if (!found) {
1188                         driver_release_tids = sta->driver_buffered_tids & tids;
1189                         if (driver_release_tids) {
1190                                 found = true;
1191                         } else {
1192                                 struct sk_buff *skb;
1193 
1194                                 while (n_frames > 0) {
1195                                         skb = skb_dequeue(&sta->tx_filtered[ac]);
1196                                         if (!skb) {
1197                                                 skb = skb_dequeue(
1198                                                         &sta->ps_tx_buf[ac]);
1199                                                 if (skb)
1200                                                         local->total_ps_buffered--;
1201                                         }
1202                                         if (!skb)
1203                                                 break;
1204                                         n_frames--;
1205                                         found = true;
1206                                         __skb_queue_tail(&frames, skb);
1207                                 }
1208                         }
1209 
1210                         /*
1211                          * If the driver has data on more than one TID then
1212                          * certainly there's more data if we release just a
1213                          * single frame now (from a single TID).
1214                          */
1215                         if (reason == IEEE80211_FRAME_RELEASE_PSPOLL &&
1216                             hweight16(driver_release_tids) > 1) {
1217                                 more_data = true;
1218                                 driver_release_tids =
1219                                         BIT(ffs(driver_release_tids) - 1);
1220                                 break;
1221                         }
1222                 }
1223 
1224                 if (!skb_queue_empty(&sta->tx_filtered[ac]) ||
1225                     !skb_queue_empty(&sta->ps_tx_buf[ac])) {
1226                         more_data = true;
1227                         break;
1228                 }
1229         }
1230 
1231         if (!found) {
1232                 int tid;
1233 
1234                 /*
1235                  * For PS-Poll, this can only happen due to a race condition
1236                  * when we set the TIM bit and the station notices it, but
1237                  * before it can poll for the frame we expire it.
1238                  *
1239                  * For uAPSD, this is said in the standard (11.2.1.5 h):
1240                  *      At each unscheduled SP for a non-AP STA, the AP shall
1241                  *      attempt to transmit at least one MSDU or MMPDU, but no
1242                  *      more than the value specified in the Max SP Length field
1243                  *      in the QoS Capability element from delivery-enabled ACs,
1244                  *      that are destined for the non-AP STA.
1245                  *
1246                  * Since we have no other MSDU/MMPDU, transmit a QoS null frame.
1247                  */
1248 
1249                 /* This will evaluate to 1, 3, 5 or 7. */
1250                 tid = 7 - ((ffs(~ignored_acs) - 1) << 1);
1251 
1252                 ieee80211_send_null_response(sdata, sta, tid, reason);
1253                 return;
1254         }
1255 
1256         if (!driver_release_tids) {
1257                 struct sk_buff_head pending;
1258                 struct sk_buff *skb;
1259                 int num = 0;
1260                 u16 tids = 0;
1261 
1262                 skb_queue_head_init(&pending);
1263 
1264                 while ((skb = __skb_dequeue(&frames))) {
1265                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1266                         struct ieee80211_hdr *hdr = (void *) skb->data;
1267                         u8 *qoshdr = NULL;
1268 
1269                         num++;
1270 
1271                         /*
1272                          * Tell TX path to send this frame even though the
1273                          * STA may still remain is PS mode after this frame
1274                          * exchange.
1275                          */
1276                         info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
1277 
1278                         /*
1279                          * Use MoreData flag to indicate whether there are
1280                          * more buffered frames for this STA
1281                          */
1282                         if (more_data || !skb_queue_empty(&frames))
1283                                 hdr->frame_control |=
1284                                         cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1285                         else
1286                                 hdr->frame_control &=
1287                                         cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
1288 
1289                         if (ieee80211_is_data_qos(hdr->frame_control) ||
1290                             ieee80211_is_qos_nullfunc(hdr->frame_control))
1291                                 qoshdr = ieee80211_get_qos_ctl(hdr);
1292 
1293                         /* end service period after last frame */
1294                         if (skb_queue_empty(&frames)) {
1295                                 if (reason == IEEE80211_FRAME_RELEASE_UAPSD &&
1296                                     qoshdr)
1297                                         *qoshdr |= IEEE80211_QOS_CTL_EOSP;
1298 
1299                                 info->flags |= IEEE80211_TX_STATUS_EOSP |
1300                                                IEEE80211_TX_CTL_REQ_TX_STATUS;
1301                         }
1302 
1303                         if (qoshdr)
1304                                 tids |= BIT(*qoshdr & IEEE80211_QOS_CTL_TID_MASK);
1305                         else
1306                                 tids |= BIT(0);
1307 
1308                         __skb_queue_tail(&pending, skb);
1309                 }
1310 
1311                 drv_allow_buffered_frames(local, sta, tids, num,
1312                                           reason, more_data);
1313 
1314                 ieee80211_add_pending_skbs(local, &pending);
1315 
1316                 sta_info_recalc_tim(sta);
1317         } else {
1318                 /*
1319                  * We need to release a frame that is buffered somewhere in the
1320                  * driver ... it'll have to handle that.
1321                  * Note that, as per the comment above, it'll also have to see
1322                  * if there is more than just one frame on the specific TID that
1323                  * we're releasing from, and it needs to set the more-data bit
1324                  * accordingly if we tell it that there's no more data. If we do
1325                  * tell it there's more data, then of course the more-data bit
1326                  * needs to be set anyway.
1327                  */
1328                 drv_release_buffered_frames(local, sta, driver_release_tids,
1329                                             n_frames, reason, more_data);
1330 
1331                 /*
1332                  * Note that we don't recalculate the TIM bit here as it would
1333                  * most likely have no effect at all unless the driver told us
1334                  * that the TID became empty before returning here from the
1335                  * release function.
1336                  * Either way, however, when the driver tells us that the TID
1337                  * became empty we'll do the TIM recalculation.
1338                  */
1339         }
1340 }
1341 
1342 void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta)
1343 {
1344         u8 ignore_for_response = sta->sta.uapsd_queues;
1345 
1346         /*
1347          * If all ACs are delivery-enabled then we should reply
1348          * from any of them, if only some are enabled we reply
1349          * only from the non-enabled ones.
1350          */
1351         if (ignore_for_response == BIT(IEEE80211_NUM_ACS) - 1)
1352                 ignore_for_response = 0;
1353 
1354         ieee80211_sta_ps_deliver_response(sta, 1, ignore_for_response,
1355                                           IEEE80211_FRAME_RELEASE_PSPOLL);
1356 }
1357 
1358 void ieee80211_sta_ps_deliver_uapsd(struct sta_info *sta)
1359 {
1360         int n_frames = sta->sta.max_sp;
1361         u8 delivery_enabled = sta->sta.uapsd_queues;
1362 
1363         /*
1364          * If we ever grow support for TSPEC this might happen if
1365          * the TSPEC update from hostapd comes in between a trigger
1366          * frame setting WLAN_STA_UAPSD in the RX path and this
1367          * actually getting called.
1368          */
1369         if (!delivery_enabled)
1370                 return;
1371 
1372         switch (sta->sta.max_sp) {
1373         case 1:
1374                 n_frames = 2;
1375                 break;
1376         case 2:
1377                 n_frames = 4;
1378                 break;
1379         case 3:
1380                 n_frames = 6;
1381                 break;
1382         case 0:
1383                 /* XXX: what is a good value? */
1384                 n_frames = 8;
1385                 break;
1386         }
1387 
1388         ieee80211_sta_ps_deliver_response(sta, n_frames, ~delivery_enabled,
1389                                           IEEE80211_FRAME_RELEASE_UAPSD);
1390 }
1391 
1392 void ieee80211_sta_block_awake(struct ieee80211_hw *hw,
1393                                struct ieee80211_sta *pubsta, bool block)
1394 {
1395         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1396 
1397         trace_api_sta_block_awake(sta->local, pubsta, block);
1398 
1399         if (block)
1400                 set_sta_flag(sta, WLAN_STA_PS_DRIVER);
1401         else if (test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1402                 ieee80211_queue_work(hw, &sta->drv_unblock_wk);
1403 }
1404 EXPORT_SYMBOL(ieee80211_sta_block_awake);
1405 
1406 void ieee80211_sta_eosp(struct ieee80211_sta *pubsta)
1407 {
1408         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1409         struct ieee80211_local *local = sta->local;
1410 
1411         trace_api_eosp(local, pubsta);
1412 
1413         clear_sta_flag(sta, WLAN_STA_SP);
1414 }
1415 EXPORT_SYMBOL(ieee80211_sta_eosp);
1416 
1417 void ieee80211_sta_set_buffered(struct ieee80211_sta *pubsta,
1418                                 u8 tid, bool buffered)
1419 {
1420         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1421 
1422         if (WARN_ON(tid >= IEEE80211_NUM_TIDS))
1423                 return;
1424 
1425         if (buffered)
1426                 set_bit(tid, &sta->driver_buffered_tids);
1427         else
1428                 clear_bit(tid, &sta->driver_buffered_tids);
1429 
1430         sta_info_recalc_tim(sta);
1431 }
1432 EXPORT_SYMBOL(ieee80211_sta_set_buffered);
1433 
1434 int sta_info_move_state(struct sta_info *sta,
1435                         enum ieee80211_sta_state new_state)
1436 {
1437         might_sleep();
1438 
1439         if (sta->sta_state == new_state)
1440                 return 0;
1441 
1442         /* check allowed transitions first */
1443 
1444         switch (new_state) {
1445         case IEEE80211_STA_NONE:
1446                 if (sta->sta_state != IEEE80211_STA_AUTH)
1447                         return -EINVAL;
1448                 break;
1449         case IEEE80211_STA_AUTH:
1450                 if (sta->sta_state != IEEE80211_STA_NONE &&
1451                     sta->sta_state != IEEE80211_STA_ASSOC)
1452                         return -EINVAL;
1453                 break;
1454         case IEEE80211_STA_ASSOC:
1455                 if (sta->sta_state != IEEE80211_STA_AUTH &&
1456                     sta->sta_state != IEEE80211_STA_AUTHORIZED)
1457                         return -EINVAL;
1458                 break;
1459         case IEEE80211_STA_AUTHORIZED:
1460                 if (sta->sta_state != IEEE80211_STA_ASSOC)
1461                         return -EINVAL;
1462                 break;
1463         default:
1464                 WARN(1, "invalid state %d", new_state);
1465                 return -EINVAL;
1466         }
1467 
1468         sta_dbg(sta->sdata, "moving STA %pM to state %d\n",
1469                 sta->sta.addr, new_state);
1470 
1471         /*
1472          * notify the driver before the actual changes so it can
1473          * fail the transition
1474          */
1475         if (test_sta_flag(sta, WLAN_STA_INSERTED)) {
1476                 int err = drv_sta_state(sta->local, sta->sdata, sta,
1477                                         sta->sta_state, new_state);
1478                 if (err)
1479                         return err;
1480         }
1481 
1482         /* reflect the change in all state variables */
1483 
1484         switch (new_state) {
1485         case IEEE80211_STA_NONE:
1486                 if (sta->sta_state == IEEE80211_STA_AUTH)
1487                         clear_bit(WLAN_STA_AUTH, &sta->_flags);
1488                 break;
1489         case IEEE80211_STA_AUTH:
1490                 if (sta->sta_state == IEEE80211_STA_NONE)
1491                         set_bit(WLAN_STA_AUTH, &sta->_flags);
1492                 else if (sta->sta_state == IEEE80211_STA_ASSOC)
1493                         clear_bit(WLAN_STA_ASSOC, &sta->_flags);
1494                 break;
1495         case IEEE80211_STA_ASSOC:
1496                 if (sta->sta_state == IEEE80211_STA_AUTH) {
1497                         set_bit(WLAN_STA_ASSOC, &sta->_flags);
1498                 } else if (sta->sta_state == IEEE80211_STA_AUTHORIZED) {
1499                         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1500                             (sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1501                              !sta->sdata->u.vlan.sta))
1502                                 atomic_dec(&sta->sdata->bss->num_mcast_sta);
1503                         clear_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
1504                 }
1505                 break;
1506         case IEEE80211_STA_AUTHORIZED:
1507                 if (sta->sta_state == IEEE80211_STA_ASSOC) {
1508                         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1509                             (sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1510                              !sta->sdata->u.vlan.sta))
1511                                 atomic_inc(&sta->sdata->bss->num_mcast_sta);
1512                         set_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
1513                 }
1514                 break;
1515         default:
1516                 break;
1517         }
1518 
1519         sta->sta_state = new_state;
1520 
1521         return 0;
1522 }
1523 

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