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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         if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
103             test_sta_flag(sta, WLAN_STA_PS_DRIVER)) {
104                 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
105                     sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
106                         ps = &sdata->bss->ps;
107                 else if (ieee80211_vif_is_mesh(&sdata->vif))
108                         ps = &sdata->u.mesh.ps;
109                 else
110                         return;
111 
112                 clear_sta_flag(sta, WLAN_STA_PS_STA);
113                 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
114 
115                 atomic_dec(&ps->num_sta_ps);
116                 sta_info_recalc_tim(sta);
117         }
118 
119         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
120                 local->total_ps_buffered -= skb_queue_len(&sta->ps_tx_buf[ac]);
121                 ieee80211_purge_tx_queue(&local->hw, &sta->ps_tx_buf[ac]);
122                 ieee80211_purge_tx_queue(&local->hw, &sta->tx_filtered[ac]);
123         }
124 
125         if (ieee80211_vif_is_mesh(&sdata->vif))
126                 mesh_sta_cleanup(sta);
127 
128         cancel_work_sync(&sta->drv_unblock_wk);
129 
130         /*
131          * Destroy aggregation state here. It would be nice to wait for the
132          * driver to finish aggregation stop and then clean up, but for now
133          * drivers have to handle aggregation stop being requested, followed
134          * directly by station destruction.
135          */
136         for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
137                 kfree(sta->ampdu_mlme.tid_start_tx[i]);
138                 tid_tx = rcu_dereference_raw(sta->ampdu_mlme.tid_tx[i]);
139                 if (!tid_tx)
140                         continue;
141                 ieee80211_purge_tx_queue(&local->hw, &tid_tx->pending);
142                 kfree(tid_tx);
143         }
144 }
145 
146 static void cleanup_single_sta(struct sta_info *sta)
147 {
148         struct ieee80211_sub_if_data *sdata = sta->sdata;
149         struct ieee80211_local *local = sdata->local;
150 
151         __cleanup_single_sta(sta);
152         sta_info_free(local, sta);
153 }
154 
155 /* protected by RCU */
156 struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata,
157                               const u8 *addr)
158 {
159         struct ieee80211_local *local = sdata->local;
160         struct sta_info *sta;
161 
162         sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)],
163                                     lockdep_is_held(&local->sta_mtx));
164         while (sta) {
165                 if (sta->sdata == sdata &&
166                     ether_addr_equal(sta->sta.addr, addr))
167                         break;
168                 sta = rcu_dereference_check(sta->hnext,
169                                             lockdep_is_held(&local->sta_mtx));
170         }
171         return sta;
172 }
173 
174 /*
175  * Get sta info either from the specified interface
176  * or from one of its vlans
177  */
178 struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata,
179                                   const u8 *addr)
180 {
181         struct ieee80211_local *local = sdata->local;
182         struct sta_info *sta;
183 
184         sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)],
185                                     lockdep_is_held(&local->sta_mtx));
186         while (sta) {
187                 if ((sta->sdata == sdata ||
188                      (sta->sdata->bss && sta->sdata->bss == sdata->bss)) &&
189                     ether_addr_equal(sta->sta.addr, addr))
190                         break;
191                 sta = rcu_dereference_check(sta->hnext,
192                                             lockdep_is_held(&local->sta_mtx));
193         }
194         return sta;
195 }
196 
197 struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
198                                      int idx)
199 {
200         struct ieee80211_local *local = sdata->local;
201         struct sta_info *sta;
202         int i = 0;
203 
204         list_for_each_entry_rcu(sta, &local->sta_list, list) {
205                 if (sdata != sta->sdata)
206                         continue;
207                 if (i < idx) {
208                         ++i;
209                         continue;
210                 }
211                 return sta;
212         }
213 
214         return NULL;
215 }
216 
217 /**
218  * sta_info_free - free STA
219  *
220  * @local: pointer to the global information
221  * @sta: STA info to free
222  *
223  * This function must undo everything done by sta_info_alloc()
224  * that may happen before sta_info_insert(). It may only be
225  * called when sta_info_insert() has not been attempted (and
226  * if that fails, the station is freed anyway.)
227  */
228 void sta_info_free(struct ieee80211_local *local, struct sta_info *sta)
229 {
230         int i;
231 
232         if (sta->rate_ctrl)
233                 rate_control_free_sta(sta);
234 
235         if (sta->tx_lat) {
236                 for (i = 0; i < IEEE80211_NUM_TIDS; i++)
237                         kfree(sta->tx_lat[i].bins);
238                 kfree(sta->tx_lat);
239         }
240 
241         sta_dbg(sta->sdata, "Destroyed STA %pM\n", sta->sta.addr);
242 
243         kfree(rcu_dereference_raw(sta->sta.rates));
244         kfree(sta);
245 }
246 
247 /* Caller must hold local->sta_mtx */
248 static void sta_info_hash_add(struct ieee80211_local *local,
249                               struct sta_info *sta)
250 {
251         lockdep_assert_held(&local->sta_mtx);
252         sta->hnext = local->sta_hash[STA_HASH(sta->sta.addr)];
253         rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)], sta);
254 }
255 
256 static void sta_unblock(struct work_struct *wk)
257 {
258         struct sta_info *sta;
259 
260         sta = container_of(wk, struct sta_info, drv_unblock_wk);
261 
262         if (sta->dead)
263                 return;
264 
265         if (!test_sta_flag(sta, WLAN_STA_PS_STA)) {
266                 local_bh_disable();
267                 ieee80211_sta_ps_deliver_wakeup(sta);
268                 local_bh_enable();
269         } else if (test_and_clear_sta_flag(sta, WLAN_STA_PSPOLL)) {
270                 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
271 
272                 local_bh_disable();
273                 ieee80211_sta_ps_deliver_poll_response(sta);
274                 local_bh_enable();
275         } else if (test_and_clear_sta_flag(sta, WLAN_STA_UAPSD)) {
276                 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
277 
278                 local_bh_disable();
279                 ieee80211_sta_ps_deliver_uapsd(sta);
280                 local_bh_enable();
281         } else
282                 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
283 }
284 
285 static int sta_prepare_rate_control(struct ieee80211_local *local,
286                                     struct sta_info *sta, gfp_t gfp)
287 {
288         if (local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)
289                 return 0;
290 
291         sta->rate_ctrl = local->rate_ctrl;
292         sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl,
293                                                      &sta->sta, gfp);
294         if (!sta->rate_ctrl_priv)
295                 return -ENOMEM;
296 
297         return 0;
298 }
299 
300 struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
301                                 const u8 *addr, gfp_t gfp)
302 {
303         struct ieee80211_local *local = sdata->local;
304         struct sta_info *sta;
305         struct timespec uptime;
306         struct ieee80211_tx_latency_bin_ranges *tx_latency;
307         int i;
308 
309         sta = kzalloc(sizeof(*sta) + local->hw.sta_data_size, gfp);
310         if (!sta)
311                 return NULL;
312 
313         rcu_read_lock();
314         tx_latency = rcu_dereference(local->tx_latency);
315         /* init stations Tx latency statistics && TID bins */
316         if (tx_latency) {
317                 sta->tx_lat = kzalloc(IEEE80211_NUM_TIDS *
318                                       sizeof(struct ieee80211_tx_latency_stat),
319                                       GFP_ATOMIC);
320                 if (!sta->tx_lat) {
321                         rcu_read_unlock();
322                         goto free;
323                 }
324 
325                 if (tx_latency->n_ranges) {
326                         for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
327                                 /* size of bins is size of the ranges +1 */
328                                 sta->tx_lat[i].bin_count =
329                                         tx_latency->n_ranges + 1;
330                                 sta->tx_lat[i].bins =
331                                         kcalloc(sta->tx_lat[i].bin_count,
332                                                 sizeof(u32), GFP_ATOMIC);
333                                 if (!sta->tx_lat[i].bins) {
334                                         rcu_read_unlock();
335                                         goto free;
336                                 }
337                         }
338                 }
339         }
340         rcu_read_unlock();
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                 goto free;
369 
370         for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
371                 /*
372                  * timer_to_tid must be initialized with identity mapping
373                  * to enable session_timer's data differentiation. See
374                  * sta_rx_agg_session_timer_expired for usage.
375                  */
376                 sta->timer_to_tid[i] = i;
377         }
378         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
379                 skb_queue_head_init(&sta->ps_tx_buf[i]);
380                 skb_queue_head_init(&sta->tx_filtered[i]);
381         }
382 
383         for (i = 0; i < IEEE80211_NUM_TIDS; i++)
384                 sta->last_seq_ctrl[i] = cpu_to_le16(USHRT_MAX);
385 
386         sta->sta.smps_mode = IEEE80211_SMPS_OFF;
387         if (sdata->vif.type == NL80211_IFTYPE_AP ||
388             sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
389                 struct ieee80211_supported_band *sband =
390                         local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
391                 u8 smps = (sband->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >>
392                                 IEEE80211_HT_CAP_SM_PS_SHIFT;
393                 /*
394                  * Assume that hostapd advertises our caps in the beacon and
395                  * this is the known_smps_mode for a station that just assciated
396                  */
397                 switch (smps) {
398                 case WLAN_HT_SMPS_CONTROL_DISABLED:
399                         sta->known_smps_mode = IEEE80211_SMPS_OFF;
400                         break;
401                 case WLAN_HT_SMPS_CONTROL_STATIC:
402                         sta->known_smps_mode = IEEE80211_SMPS_STATIC;
403                         break;
404                 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
405                         sta->known_smps_mode = IEEE80211_SMPS_DYNAMIC;
406                         break;
407                 default:
408                         WARN_ON(1);
409                 }
410         }
411 
412         sta_dbg(sdata, "Allocated STA %pM\n", sta->sta.addr);
413         return sta;
414 
415 free:
416         if (sta->tx_lat) {
417                 for (i = 0; i < IEEE80211_NUM_TIDS; i++)
418                         kfree(sta->tx_lat[i].bins);
419                 kfree(sta->tx_lat);
420         }
421         kfree(sta);
422         return NULL;
423 }
424 
425 static int sta_info_insert_check(struct sta_info *sta)
426 {
427         struct ieee80211_sub_if_data *sdata = sta->sdata;
428 
429         /*
430          * Can't be a WARN_ON because it can be triggered through a race:
431          * something inserts a STA (on one CPU) without holding the RTNL
432          * and another CPU turns off the net device.
433          */
434         if (unlikely(!ieee80211_sdata_running(sdata)))
435                 return -ENETDOWN;
436 
437         if (WARN_ON(ether_addr_equal(sta->sta.addr, sdata->vif.addr) ||
438                     is_multicast_ether_addr(sta->sta.addr)))
439                 return -EINVAL;
440 
441         return 0;
442 }
443 
444 static int sta_info_insert_drv_state(struct ieee80211_local *local,
445                                      struct ieee80211_sub_if_data *sdata,
446                                      struct sta_info *sta)
447 {
448         enum ieee80211_sta_state state;
449         int err = 0;
450 
451         for (state = IEEE80211_STA_NOTEXIST; state < sta->sta_state; state++) {
452                 err = drv_sta_state(local, sdata, sta, state, state + 1);
453                 if (err)
454                         break;
455         }
456 
457         if (!err) {
458                 /*
459                  * Drivers using legacy sta_add/sta_remove callbacks only
460                  * get uploaded set to true after sta_add is called.
461                  */
462                 if (!local->ops->sta_add)
463                         sta->uploaded = true;
464                 return 0;
465         }
466 
467         if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
468                 sdata_info(sdata,
469                            "failed to move IBSS STA %pM to state %d (%d) - keeping it anyway\n",
470                            sta->sta.addr, state + 1, err);
471                 err = 0;
472         }
473 
474         /* unwind on error */
475         for (; state > IEEE80211_STA_NOTEXIST; state--)
476                 WARN_ON(drv_sta_state(local, sdata, sta, state, state - 1));
477 
478         return err;
479 }
480 
481 /*
482  * should be called with sta_mtx locked
483  * this function replaces the mutex lock
484  * with a RCU lock
485  */
486 static int sta_info_insert_finish(struct sta_info *sta) __acquires(RCU)
487 {
488         struct ieee80211_local *local = sta->local;
489         struct ieee80211_sub_if_data *sdata = sta->sdata;
490         struct station_info sinfo;
491         int err = 0;
492 
493         lockdep_assert_held(&local->sta_mtx);
494 
495         /* check if STA exists already */
496         if (sta_info_get_bss(sdata, sta->sta.addr)) {
497                 err = -EEXIST;
498                 goto out_err;
499         }
500 
501         local->num_sta++;
502         local->sta_generation++;
503         smp_mb();
504 
505         /* simplify things and don't accept BA sessions yet */
506         set_sta_flag(sta, WLAN_STA_BLOCK_BA);
507 
508         /* make the station visible */
509         sta_info_hash_add(local, sta);
510 
511         list_add_rcu(&sta->list, &local->sta_list);
512 
513         /* notify driver */
514         err = sta_info_insert_drv_state(local, sdata, sta);
515         if (err)
516                 goto out_remove;
517 
518         set_sta_flag(sta, WLAN_STA_INSERTED);
519         /* accept BA sessions now */
520         clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
521 
522         ieee80211_recalc_min_chandef(sdata);
523         ieee80211_sta_debugfs_add(sta);
524         rate_control_add_sta_debugfs(sta);
525 
526         memset(&sinfo, 0, sizeof(sinfo));
527         sinfo.filled = 0;
528         sinfo.generation = local->sta_generation;
529         cfg80211_new_sta(sdata->dev, sta->sta.addr, &sinfo, GFP_KERNEL);
530 
531         sta_dbg(sdata, "Inserted STA %pM\n", sta->sta.addr);
532 
533         /* move reference to rcu-protected */
534         rcu_read_lock();
535         mutex_unlock(&local->sta_mtx);
536 
537         if (ieee80211_vif_is_mesh(&sdata->vif))
538                 mesh_accept_plinks_update(sdata);
539 
540         return 0;
541  out_remove:
542         sta_info_hash_del(local, sta);
543         list_del_rcu(&sta->list);
544         local->num_sta--;
545         synchronize_net();
546         __cleanup_single_sta(sta);
547  out_err:
548         mutex_unlock(&local->sta_mtx);
549         rcu_read_lock();
550         return err;
551 }
552 
553 int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU)
554 {
555         struct ieee80211_local *local = sta->local;
556         int err = 0;
557 
558         might_sleep();
559 
560         err = sta_info_insert_check(sta);
561         if (err) {
562                 rcu_read_lock();
563                 goto out_free;
564         }
565 
566         mutex_lock(&local->sta_mtx);
567 
568         err = sta_info_insert_finish(sta);
569         if (err)
570                 goto out_free;
571 
572         return 0;
573  out_free:
574         BUG_ON(!err);
575         sta_info_free(local, sta);
576         return err;
577 }
578 
579 int sta_info_insert(struct sta_info *sta)
580 {
581         int err = sta_info_insert_rcu(sta);
582 
583         rcu_read_unlock();
584 
585         return err;
586 }
587 
588 static inline void __bss_tim_set(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 __set_bit() format.
593          */
594         tim[id / 8] |= (1 << (id % 8));
595 }
596 
597 static inline void __bss_tim_clear(u8 *tim, u16 id)
598 {
599         /*
600          * This format has been mandated by the IEEE specifications,
601          * so this line may not be changed to use the __clear_bit() format.
602          */
603         tim[id / 8] &= ~(1 << (id % 8));
604 }
605 
606 static inline bool __bss_tim_get(u8 *tim, u16 id)
607 {
608         /*
609          * This format has been mandated by the IEEE specifications,
610          * so this line may not be changed to use the test_bit() format.
611          */
612         return tim[id / 8] & (1 << (id % 8));
613 }
614 
615 static unsigned long ieee80211_tids_for_ac(int ac)
616 {
617         /* If we ever support TIDs > 7, this obviously needs to be adjusted */
618         switch (ac) {
619         case IEEE80211_AC_VO:
620                 return BIT(6) | BIT(7);
621         case IEEE80211_AC_VI:
622                 return BIT(4) | BIT(5);
623         case IEEE80211_AC_BE:
624                 return BIT(0) | BIT(3);
625         case IEEE80211_AC_BK:
626                 return BIT(1) | BIT(2);
627         default:
628                 WARN_ON(1);
629                 return 0;
630         }
631 }
632 
633 void sta_info_recalc_tim(struct sta_info *sta)
634 {
635         struct ieee80211_local *local = sta->local;
636         struct ps_data *ps;
637         bool indicate_tim = false;
638         u8 ignore_for_tim = sta->sta.uapsd_queues;
639         int ac;
640         u16 id;
641 
642         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
643             sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
644                 if (WARN_ON_ONCE(!sta->sdata->bss))
645                         return;
646 
647                 ps = &sta->sdata->bss->ps;
648                 id = sta->sta.aid;
649 #ifdef CONFIG_MAC80211_MESH
650         } else if (ieee80211_vif_is_mesh(&sta->sdata->vif)) {
651                 ps = &sta->sdata->u.mesh.ps;
652                 /* TIM map only for 1 <= PLID <= IEEE80211_MAX_AID */
653                 id = sta->plid % (IEEE80211_MAX_AID + 1);
654 #endif
655         } else {
656                 return;
657         }
658 
659         /* No need to do anything if the driver does all */
660         if (local->hw.flags & IEEE80211_HW_AP_LINK_PS)
661                 return;
662 
663         if (sta->dead)
664                 goto done;
665 
666         /*
667          * If all ACs are delivery-enabled then we should build
668          * the TIM bit for all ACs anyway; if only some are then
669          * we ignore those and build the TIM bit using only the
670          * non-enabled ones.
671          */
672         if (ignore_for_tim == BIT(IEEE80211_NUM_ACS) - 1)
673                 ignore_for_tim = 0;
674 
675         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
676                 unsigned long tids;
677 
678                 if (ignore_for_tim & BIT(ac))
679                         continue;
680 
681                 indicate_tim |= !skb_queue_empty(&sta->tx_filtered[ac]) ||
682                                 !skb_queue_empty(&sta->ps_tx_buf[ac]);
683                 if (indicate_tim)
684                         break;
685 
686                 tids = ieee80211_tids_for_ac(ac);
687 
688                 indicate_tim |=
689                         sta->driver_buffered_tids & tids;
690         }
691 
692  done:
693         spin_lock_bh(&local->tim_lock);
694 
695         if (indicate_tim == __bss_tim_get(ps->tim, id))
696                 goto out_unlock;
697 
698         if (indicate_tim)
699                 __bss_tim_set(ps->tim, id);
700         else
701                 __bss_tim_clear(ps->tim, id);
702 
703         if (local->ops->set_tim) {
704                 local->tim_in_locked_section = true;
705                 drv_set_tim(local, &sta->sta, indicate_tim);
706                 local->tim_in_locked_section = false;
707         }
708 
709 out_unlock:
710         spin_unlock_bh(&local->tim_lock);
711 }
712 
713 static bool sta_info_buffer_expired(struct sta_info *sta, struct sk_buff *skb)
714 {
715         struct ieee80211_tx_info *info;
716         int timeout;
717 
718         if (!skb)
719                 return false;
720 
721         info = IEEE80211_SKB_CB(skb);
722 
723         /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
724         timeout = (sta->listen_interval *
725                    sta->sdata->vif.bss_conf.beacon_int *
726                    32 / 15625) * HZ;
727         if (timeout < STA_TX_BUFFER_EXPIRE)
728                 timeout = STA_TX_BUFFER_EXPIRE;
729         return time_after(jiffies, info->control.jiffies + timeout);
730 }
731 
732 
733 static bool sta_info_cleanup_expire_buffered_ac(struct ieee80211_local *local,
734                                                 struct sta_info *sta, int ac)
735 {
736         unsigned long flags;
737         struct sk_buff *skb;
738 
739         /*
740          * First check for frames that should expire on the filtered
741          * queue. Frames here were rejected by the driver and are on
742          * a separate queue to avoid reordering with normal PS-buffered
743          * frames. They also aren't accounted for right now in the
744          * total_ps_buffered counter.
745          */
746         for (;;) {
747                 spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
748                 skb = skb_peek(&sta->tx_filtered[ac]);
749                 if (sta_info_buffer_expired(sta, skb))
750                         skb = __skb_dequeue(&sta->tx_filtered[ac]);
751                 else
752                         skb = NULL;
753                 spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
754 
755                 /*
756                  * Frames are queued in order, so if this one
757                  * hasn't expired yet we can stop testing. If
758                  * we actually reached the end of the queue we
759                  * also need to stop, of course.
760                  */
761                 if (!skb)
762                         break;
763                 ieee80211_free_txskb(&local->hw, skb);
764         }
765 
766         /*
767          * Now also check the normal PS-buffered queue, this will
768          * only find something if the filtered queue was emptied
769          * since the filtered frames are all before the normal PS
770          * buffered frames.
771          */
772         for (;;) {
773                 spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
774                 skb = skb_peek(&sta->ps_tx_buf[ac]);
775                 if (sta_info_buffer_expired(sta, skb))
776                         skb = __skb_dequeue(&sta->ps_tx_buf[ac]);
777                 else
778                         skb = NULL;
779                 spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
780 
781                 /*
782                  * frames are queued in order, so if this one
783                  * hasn't expired yet (or we reached the end of
784                  * the queue) we can stop testing
785                  */
786                 if (!skb)
787                         break;
788 
789                 local->total_ps_buffered--;
790                 ps_dbg(sta->sdata, "Buffered frame expired (STA %pM)\n",
791                        sta->sta.addr);
792                 ieee80211_free_txskb(&local->hw, skb);
793         }
794 
795         /*
796          * Finally, recalculate the TIM bit for this station -- it might
797          * now be clear because the station was too slow to retrieve its
798          * frames.
799          */
800         sta_info_recalc_tim(sta);
801 
802         /*
803          * Return whether there are any frames still buffered, this is
804          * used to check whether the cleanup timer still needs to run,
805          * if there are no frames we don't need to rearm the timer.
806          */
807         return !(skb_queue_empty(&sta->ps_tx_buf[ac]) &&
808                  skb_queue_empty(&sta->tx_filtered[ac]));
809 }
810 
811 static bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
812                                              struct sta_info *sta)
813 {
814         bool have_buffered = false;
815         int ac;
816 
817         /* This is only necessary for stations on BSS/MBSS interfaces */
818         if (!sta->sdata->bss &&
819             !ieee80211_vif_is_mesh(&sta->sdata->vif))
820                 return false;
821 
822         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
823                 have_buffered |=
824                         sta_info_cleanup_expire_buffered_ac(local, sta, ac);
825 
826         return have_buffered;
827 }
828 
829 static int __must_check __sta_info_destroy_part1(struct sta_info *sta)
830 {
831         struct ieee80211_local *local;
832         struct ieee80211_sub_if_data *sdata;
833         int ret;
834 
835         might_sleep();
836 
837         if (!sta)
838                 return -ENOENT;
839 
840         local = sta->local;
841         sdata = sta->sdata;
842 
843         lockdep_assert_held(&local->sta_mtx);
844 
845         /*
846          * Before removing the station from the driver and
847          * rate control, it might still start new aggregation
848          * sessions -- block that to make sure the tear-down
849          * will be sufficient.
850          */
851         set_sta_flag(sta, WLAN_STA_BLOCK_BA);
852         ieee80211_sta_tear_down_BA_sessions(sta, AGG_STOP_DESTROY_STA);
853 
854         ret = sta_info_hash_del(local, sta);
855         if (WARN_ON(ret))
856                 return ret;
857 
858         list_del_rcu(&sta->list);
859 
860         drv_sta_pre_rcu_remove(local, sta->sdata, sta);
861 
862         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
863             rcu_access_pointer(sdata->u.vlan.sta) == sta)
864                 RCU_INIT_POINTER(sdata->u.vlan.sta, NULL);
865 
866         return 0;
867 }
868 
869 static void __sta_info_destroy_part2(struct sta_info *sta)
870 {
871         struct ieee80211_local *local = sta->local;
872         struct ieee80211_sub_if_data *sdata = sta->sdata;
873         int ret;
874 
875         /*
876          * NOTE: This assumes at least synchronize_net() was done
877          *       after _part1 and before _part2!
878          */
879 
880         might_sleep();
881         lockdep_assert_held(&local->sta_mtx);
882 
883         /* now keys can no longer be reached */
884         ieee80211_free_sta_keys(local, sta);
885 
886         sta->dead = true;
887 
888         local->num_sta--;
889         local->sta_generation++;
890 
891         while (sta->sta_state > IEEE80211_STA_NONE) {
892                 ret = sta_info_move_state(sta, sta->sta_state - 1);
893                 if (ret) {
894                         WARN_ON_ONCE(1);
895                         break;
896                 }
897         }
898 
899         if (sta->uploaded) {
900                 ret = drv_sta_state(local, sdata, sta, IEEE80211_STA_NONE,
901                                     IEEE80211_STA_NOTEXIST);
902                 WARN_ON_ONCE(ret != 0);
903         }
904 
905         sta_dbg(sdata, "Removed STA %pM\n", sta->sta.addr);
906 
907         cfg80211_del_sta(sdata->dev, sta->sta.addr, GFP_KERNEL);
908 
909         rate_control_remove_sta_debugfs(sta);
910         ieee80211_sta_debugfs_remove(sta);
911         ieee80211_recalc_min_chandef(sdata);
912 
913         cleanup_single_sta(sta);
914 }
915 
916 int __must_check __sta_info_destroy(struct sta_info *sta)
917 {
918         int err = __sta_info_destroy_part1(sta);
919 
920         if (err)
921                 return err;
922 
923         synchronize_net();
924 
925         __sta_info_destroy_part2(sta);
926 
927         return 0;
928 }
929 
930 int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, const u8 *addr)
931 {
932         struct sta_info *sta;
933         int ret;
934 
935         mutex_lock(&sdata->local->sta_mtx);
936         sta = sta_info_get(sdata, addr);
937         ret = __sta_info_destroy(sta);
938         mutex_unlock(&sdata->local->sta_mtx);
939 
940         return ret;
941 }
942 
943 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
944                               const u8 *addr)
945 {
946         struct sta_info *sta;
947         int ret;
948 
949         mutex_lock(&sdata->local->sta_mtx);
950         sta = sta_info_get_bss(sdata, addr);
951         ret = __sta_info_destroy(sta);
952         mutex_unlock(&sdata->local->sta_mtx);
953 
954         return ret;
955 }
956 
957 static void sta_info_cleanup(unsigned long data)
958 {
959         struct ieee80211_local *local = (struct ieee80211_local *) data;
960         struct sta_info *sta;
961         bool timer_needed = false;
962 
963         rcu_read_lock();
964         list_for_each_entry_rcu(sta, &local->sta_list, list)
965                 if (sta_info_cleanup_expire_buffered(local, sta))
966                         timer_needed = true;
967         rcu_read_unlock();
968 
969         if (local->quiescing)
970                 return;
971 
972         if (!timer_needed)
973                 return;
974 
975         mod_timer(&local->sta_cleanup,
976                   round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL));
977 }
978 
979 void sta_info_init(struct ieee80211_local *local)
980 {
981         spin_lock_init(&local->tim_lock);
982         mutex_init(&local->sta_mtx);
983         INIT_LIST_HEAD(&local->sta_list);
984 
985         setup_timer(&local->sta_cleanup, sta_info_cleanup,
986                     (unsigned long)local);
987 }
988 
989 void sta_info_stop(struct ieee80211_local *local)
990 {
991         del_timer_sync(&local->sta_cleanup);
992 }
993 
994 
995 int __sta_info_flush(struct ieee80211_sub_if_data *sdata, bool vlans)
996 {
997         struct ieee80211_local *local = sdata->local;
998         struct sta_info *sta, *tmp;
999         LIST_HEAD(free_list);
1000         int ret = 0;
1001 
1002         might_sleep();
1003 
1004         WARN_ON(vlans && sdata->vif.type != NL80211_IFTYPE_AP);
1005         WARN_ON(vlans && !sdata->bss);
1006 
1007         mutex_lock(&local->sta_mtx);
1008         list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1009                 if (sdata == sta->sdata ||
1010                     (vlans && sdata->bss == sta->sdata->bss)) {
1011                         if (!WARN_ON(__sta_info_destroy_part1(sta)))
1012                                 list_add(&sta->free_list, &free_list);
1013                         ret++;
1014                 }
1015         }
1016 
1017         if (!list_empty(&free_list)) {
1018                 synchronize_net();
1019                 list_for_each_entry_safe(sta, tmp, &free_list, free_list)
1020                         __sta_info_destroy_part2(sta);
1021         }
1022         mutex_unlock(&local->sta_mtx);
1023 
1024         return ret;
1025 }
1026 
1027 void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
1028                           unsigned long exp_time)
1029 {
1030         struct ieee80211_local *local = sdata->local;
1031         struct sta_info *sta, *tmp;
1032 
1033         mutex_lock(&local->sta_mtx);
1034 
1035         list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1036                 if (sdata != sta->sdata)
1037                         continue;
1038 
1039                 if (time_after(jiffies, sta->last_rx + exp_time)) {
1040                         sta_dbg(sta->sdata, "expiring inactive STA %pM\n",
1041                                 sta->sta.addr);
1042 
1043                         if (ieee80211_vif_is_mesh(&sdata->vif) &&
1044                             test_sta_flag(sta, WLAN_STA_PS_STA))
1045                                 atomic_dec(&sdata->u.mesh.ps.num_sta_ps);
1046 
1047                         WARN_ON(__sta_info_destroy(sta));
1048                 }
1049         }
1050 
1051         mutex_unlock(&local->sta_mtx);
1052 }
1053 
1054 struct ieee80211_sta *ieee80211_find_sta_by_ifaddr(struct ieee80211_hw *hw,
1055                                                const u8 *addr,
1056                                                const u8 *localaddr)
1057 {
1058         struct sta_info *sta, *nxt;
1059 
1060         /*
1061          * Just return a random station if localaddr is NULL
1062          * ... first in list.
1063          */
1064         for_each_sta_info(hw_to_local(hw), addr, sta, nxt) {
1065                 if (localaddr &&
1066                     !ether_addr_equal(sta->sdata->vif.addr, localaddr))
1067                         continue;
1068                 if (!sta->uploaded)
1069                         return NULL;
1070                 return &sta->sta;
1071         }
1072 
1073         return NULL;
1074 }
1075 EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr);
1076 
1077 struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif,
1078                                          const u8 *addr)
1079 {
1080         struct sta_info *sta;
1081 
1082         if (!vif)
1083                 return NULL;
1084 
1085         sta = sta_info_get_bss(vif_to_sdata(vif), addr);
1086         if (!sta)
1087                 return NULL;
1088 
1089         if (!sta->uploaded)
1090                 return NULL;
1091 
1092         return &sta->sta;
1093 }
1094 EXPORT_SYMBOL(ieee80211_find_sta);
1095 
1096 /* powersave support code */
1097 void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta)
1098 {
1099         struct ieee80211_sub_if_data *sdata = sta->sdata;
1100         struct ieee80211_local *local = sdata->local;
1101         struct sk_buff_head pending;
1102         int filtered = 0, buffered = 0, ac;
1103         unsigned long flags;
1104         struct ps_data *ps;
1105 
1106         if (sdata->vif.type == NL80211_IFTYPE_AP ||
1107             sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1108                 ps = &sdata->bss->ps;
1109         else if (ieee80211_vif_is_mesh(&sdata->vif))
1110                 ps = &sdata->u.mesh.ps;
1111         else
1112                 return;
1113 
1114         clear_sta_flag(sta, WLAN_STA_SP);
1115 
1116         BUILD_BUG_ON(BITS_TO_LONGS(IEEE80211_NUM_TIDS) > 1);
1117         sta->driver_buffered_tids = 0;
1118 
1119         if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1120                 drv_sta_notify(local, sdata, STA_NOTIFY_AWAKE, &sta->sta);
1121 
1122         skb_queue_head_init(&pending);
1123 
1124         /* sync with ieee80211_tx_h_unicast_ps_buf */
1125         spin_lock(&sta->ps_lock);
1126         /* Send all buffered frames to the station */
1127         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1128                 int count = skb_queue_len(&pending), tmp;
1129 
1130                 spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
1131                 skb_queue_splice_tail_init(&sta->tx_filtered[ac], &pending);
1132                 spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
1133                 tmp = skb_queue_len(&pending);
1134                 filtered += tmp - count;
1135                 count = tmp;
1136 
1137                 spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
1138                 skb_queue_splice_tail_init(&sta->ps_tx_buf[ac], &pending);
1139                 spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
1140                 tmp = skb_queue_len(&pending);
1141                 buffered += tmp - count;
1142         }
1143 
1144         ieee80211_add_pending_skbs(local, &pending);
1145         clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
1146         clear_sta_flag(sta, WLAN_STA_PS_STA);
1147         spin_unlock(&sta->ps_lock);
1148 
1149         atomic_dec(&ps->num_sta_ps);
1150 
1151         /* This station just woke up and isn't aware of our SMPS state */
1152         if (!ieee80211_smps_is_restrictive(sta->known_smps_mode,
1153                                            sdata->smps_mode) &&
1154             sta->known_smps_mode != sdata->bss->req_smps &&
1155             sta_info_tx_streams(sta) != 1) {
1156                 ht_dbg(sdata,
1157                        "%pM just woke up and MIMO capable - update SMPS\n",
1158                        sta->sta.addr);
1159                 ieee80211_send_smps_action(sdata, sdata->bss->req_smps,
1160                                            sta->sta.addr,
1161                                            sdata->vif.bss_conf.bssid);
1162         }
1163 
1164         local->total_ps_buffered -= buffered;
1165 
1166         sta_info_recalc_tim(sta);
1167 
1168         ps_dbg(sdata,
1169                "STA %pM aid %d sending %d filtered/%d PS frames since STA not sleeping anymore\n",
1170                sta->sta.addr, sta->sta.aid, filtered, buffered);
1171 }
1172 
1173 static void ieee80211_send_null_response(struct ieee80211_sub_if_data *sdata,
1174                                          struct sta_info *sta, int tid,
1175                                          enum ieee80211_frame_release_type reason,
1176                                          bool call_driver)
1177 {
1178         struct ieee80211_local *local = sdata->local;
1179         struct ieee80211_qos_hdr *nullfunc;
1180         struct sk_buff *skb;
1181         int size = sizeof(*nullfunc);
1182         __le16 fc;
1183         bool qos = test_sta_flag(sta, WLAN_STA_WME);
1184         struct ieee80211_tx_info *info;
1185         struct ieee80211_chanctx_conf *chanctx_conf;
1186 
1187         if (qos) {
1188                 fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1189                                  IEEE80211_STYPE_QOS_NULLFUNC |
1190                                  IEEE80211_FCTL_FROMDS);
1191         } else {
1192                 size -= 2;
1193                 fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1194                                  IEEE80211_STYPE_NULLFUNC |
1195                                  IEEE80211_FCTL_FROMDS);
1196         }
1197 
1198         skb = dev_alloc_skb(local->hw.extra_tx_headroom + size);
1199         if (!skb)
1200                 return;
1201 
1202         skb_reserve(skb, local->hw.extra_tx_headroom);
1203 
1204         nullfunc = (void *) skb_put(skb, size);
1205         nullfunc->frame_control = fc;
1206         nullfunc->duration_id = 0;
1207         memcpy(nullfunc->addr1, sta->sta.addr, ETH_ALEN);
1208         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
1209         memcpy(nullfunc->addr3, sdata->vif.addr, ETH_ALEN);
1210         nullfunc->seq_ctrl = 0;
1211 
1212         skb->priority = tid;
1213         skb_set_queue_mapping(skb, ieee802_1d_to_ac[tid]);
1214         if (qos) {
1215                 nullfunc->qos_ctrl = cpu_to_le16(tid);
1216 
1217                 if (reason == IEEE80211_FRAME_RELEASE_UAPSD)
1218                         nullfunc->qos_ctrl |=
1219                                 cpu_to_le16(IEEE80211_QOS_CTL_EOSP);
1220         }
1221 
1222         info = IEEE80211_SKB_CB(skb);
1223 
1224         /*
1225          * Tell TX path to send this frame even though the
1226          * STA may still remain is PS mode after this frame
1227          * exchange. Also set EOSP to indicate this packet
1228          * ends the poll/service period.
1229          */
1230         info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER |
1231                        IEEE80211_TX_CTL_PS_RESPONSE |
1232                        IEEE80211_TX_STATUS_EOSP |
1233                        IEEE80211_TX_CTL_REQ_TX_STATUS;
1234 
1235         if (call_driver)
1236                 drv_allow_buffered_frames(local, sta, BIT(tid), 1,
1237                                           reason, false);
1238 
1239         skb->dev = sdata->dev;
1240 
1241         rcu_read_lock();
1242         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1243         if (WARN_ON(!chanctx_conf)) {
1244                 rcu_read_unlock();
1245                 kfree_skb(skb);
1246                 return;
1247         }
1248 
1249         ieee80211_xmit(sdata, skb, chanctx_conf->def.chan->band);
1250         rcu_read_unlock();
1251 }
1252 
1253 static int find_highest_prio_tid(unsigned long tids)
1254 {
1255         /* lower 3 TIDs aren't ordered perfectly */
1256         if (tids & 0xF8)
1257                 return fls(tids) - 1;
1258         /* TID 0 is BE just like TID 3 */
1259         if (tids & BIT(0))
1260                 return 0;
1261         return fls(tids) - 1;
1262 }
1263 
1264 static void
1265 ieee80211_sta_ps_deliver_response(struct sta_info *sta,
1266                                   int n_frames, u8 ignored_acs,
1267                                   enum ieee80211_frame_release_type reason)
1268 {
1269         struct ieee80211_sub_if_data *sdata = sta->sdata;
1270         struct ieee80211_local *local = sdata->local;
1271         bool more_data = false;
1272         int ac;
1273         unsigned long driver_release_tids = 0;
1274         struct sk_buff_head frames;
1275 
1276         /* Service or PS-Poll period starts */
1277         set_sta_flag(sta, WLAN_STA_SP);
1278 
1279         __skb_queue_head_init(&frames);
1280 
1281         /* Get response frame(s) and more data bit for the last one. */
1282         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1283                 unsigned long tids;
1284 
1285                 if (ignored_acs & BIT(ac))
1286                         continue;
1287 
1288                 tids = ieee80211_tids_for_ac(ac);
1289 
1290                 /* if we already have frames from software, then we can't also
1291                  * release from hardware queues
1292                  */
1293                 if (skb_queue_empty(&frames))
1294                         driver_release_tids |= sta->driver_buffered_tids & tids;
1295 
1296                 if (driver_release_tids) {
1297                         /* If the driver has data on more than one TID then
1298                          * certainly there's more data if we release just a
1299                          * single frame now (from a single TID). This will
1300                          * only happen for PS-Poll.
1301                          */
1302                         if (reason == IEEE80211_FRAME_RELEASE_PSPOLL &&
1303                             hweight16(driver_release_tids) > 1) {
1304                                 more_data = true;
1305                                 driver_release_tids =
1306                                         BIT(find_highest_prio_tid(
1307                                                 driver_release_tids));
1308                                 break;
1309                         }
1310                 } else {
1311                         struct sk_buff *skb;
1312 
1313                         while (n_frames > 0) {
1314                                 skb = skb_dequeue(&sta->tx_filtered[ac]);
1315                                 if (!skb) {
1316                                         skb = skb_dequeue(
1317                                                 &sta->ps_tx_buf[ac]);
1318                                         if (skb)
1319                                                 local->total_ps_buffered--;
1320                                 }
1321                                 if (!skb)
1322                                         break;
1323                                 n_frames--;
1324                                 __skb_queue_tail(&frames, skb);
1325                         }
1326                 }
1327 
1328                 /* If we have more frames buffered on this AC, then set the
1329                  * more-data bit and abort the loop since we can't send more
1330                  * data from other ACs before the buffered frames from this.
1331                  */
1332                 if (!skb_queue_empty(&sta->tx_filtered[ac]) ||
1333                     !skb_queue_empty(&sta->ps_tx_buf[ac])) {
1334                         more_data = true;
1335                         break;
1336                 }
1337         }
1338 
1339         if (skb_queue_empty(&frames) && !driver_release_tids) {
1340                 int tid;
1341 
1342                 /*
1343                  * For PS-Poll, this can only happen due to a race condition
1344                  * when we set the TIM bit and the station notices it, but
1345                  * before it can poll for the frame we expire it.
1346                  *
1347                  * For uAPSD, this is said in the standard (11.2.1.5 h):
1348                  *      At each unscheduled SP for a non-AP STA, the AP shall
1349                  *      attempt to transmit at least one MSDU or MMPDU, but no
1350                  *      more than the value specified in the Max SP Length field
1351                  *      in the QoS Capability element from delivery-enabled ACs,
1352                  *      that are destined for the non-AP STA.
1353                  *
1354                  * Since we have no other MSDU/MMPDU, transmit a QoS null frame.
1355                  */
1356 
1357                 /* This will evaluate to 1, 3, 5 or 7. */
1358                 tid = 7 - ((ffs(~ignored_acs) - 1) << 1);
1359 
1360                 ieee80211_send_null_response(sdata, sta, tid, reason, true);
1361         } else if (!driver_release_tids) {
1362                 struct sk_buff_head pending;
1363                 struct sk_buff *skb;
1364                 int num = 0;
1365                 u16 tids = 0;
1366                 bool need_null = false;
1367 
1368                 skb_queue_head_init(&pending);
1369 
1370                 while ((skb = __skb_dequeue(&frames))) {
1371                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1372                         struct ieee80211_hdr *hdr = (void *) skb->data;
1373                         u8 *qoshdr = NULL;
1374 
1375                         num++;
1376 
1377                         /*
1378                          * Tell TX path to send this frame even though the
1379                          * STA may still remain is PS mode after this frame
1380                          * exchange.
1381                          */
1382                         info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER |
1383                                        IEEE80211_TX_CTL_PS_RESPONSE;
1384 
1385                         /*
1386                          * Use MoreData flag to indicate whether there are
1387                          * more buffered frames for this STA
1388                          */
1389                         if (more_data || !skb_queue_empty(&frames))
1390                                 hdr->frame_control |=
1391                                         cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1392                         else
1393                                 hdr->frame_control &=
1394                                         cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
1395 
1396                         if (ieee80211_is_data_qos(hdr->frame_control) ||
1397                             ieee80211_is_qos_nullfunc(hdr->frame_control))
1398                                 qoshdr = ieee80211_get_qos_ctl(hdr);
1399 
1400                         tids |= BIT(skb->priority);
1401 
1402                         __skb_queue_tail(&pending, skb);
1403 
1404                         /* end service period after last frame or add one */
1405                         if (!skb_queue_empty(&frames))
1406                                 continue;
1407 
1408                         if (reason != IEEE80211_FRAME_RELEASE_UAPSD) {
1409                                 /* for PS-Poll, there's only one frame */
1410                                 info->flags |= IEEE80211_TX_STATUS_EOSP |
1411                                                IEEE80211_TX_CTL_REQ_TX_STATUS;
1412                                 break;
1413                         }
1414 
1415                         /* For uAPSD, things are a bit more complicated. If the
1416                          * last frame has a QoS header (i.e. is a QoS-data or
1417                          * QoS-nulldata frame) then just set the EOSP bit there
1418                          * and be done.
1419                          * If the frame doesn't have a QoS header (which means
1420                          * it should be a bufferable MMPDU) then we can't set
1421                          * the EOSP bit in the QoS header; add a QoS-nulldata
1422                          * frame to the list to send it after the MMPDU.
1423                          *
1424                          * Note that this code is only in the mac80211-release
1425                          * code path, we assume that the driver will not buffer
1426                          * anything but QoS-data frames, or if it does, will
1427                          * create the QoS-nulldata frame by itself if needed.
1428                          *
1429                          * Cf. 802.11-2012 10.2.1.10 (c).
1430                          */
1431                         if (qoshdr) {
1432                                 *qoshdr |= IEEE80211_QOS_CTL_EOSP;
1433 
1434                                 info->flags |= IEEE80211_TX_STATUS_EOSP |
1435                                                IEEE80211_TX_CTL_REQ_TX_STATUS;
1436                         } else {
1437                                 /* The standard isn't completely clear on this
1438                                  * as it says the more-data bit should be set
1439                                  * if there are more BUs. The QoS-Null frame
1440                                  * we're about to send isn't buffered yet, we
1441                                  * only create it below, but let's pretend it
1442                                  * was buffered just in case some clients only
1443                                  * expect more-data=0 when eosp=1.
1444                                  */
1445                                 hdr->frame_control |=
1446                                         cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1447                                 need_null = true;
1448                                 num++;
1449                         }
1450                         break;
1451                 }
1452 
1453                 drv_allow_buffered_frames(local, sta, tids, num,
1454                                           reason, more_data);
1455 
1456                 ieee80211_add_pending_skbs(local, &pending);
1457 
1458                 if (need_null)
1459                         ieee80211_send_null_response(
1460                                 sdata, sta, find_highest_prio_tid(tids),
1461                                 reason, false);
1462 
1463                 sta_info_recalc_tim(sta);
1464         } else {
1465                 /*
1466                  * We need to release a frame that is buffered somewhere in the
1467                  * driver ... it'll have to handle that.
1468                  * Note that the driver also has to check the number of frames
1469                  * on the TIDs we're releasing from - if there are more than
1470                  * n_frames it has to set the more-data bit (if we didn't ask
1471                  * it to set it anyway due to other buffered frames); if there
1472                  * are fewer than n_frames it has to make sure to adjust that
1473                  * to allow the service period to end properly.
1474                  */
1475                 drv_release_buffered_frames(local, sta, driver_release_tids,
1476                                             n_frames, reason, more_data);
1477 
1478                 /*
1479                  * Note that we don't recalculate the TIM bit here as it would
1480                  * most likely have no effect at all unless the driver told us
1481                  * that the TID(s) became empty before returning here from the
1482                  * release function.
1483                  * Either way, however, when the driver tells us that the TID(s)
1484                  * became empty we'll do the TIM recalculation.
1485                  */
1486         }
1487 }
1488 
1489 void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta)
1490 {
1491         u8 ignore_for_response = sta->sta.uapsd_queues;
1492 
1493         /*
1494          * If all ACs are delivery-enabled then we should reply
1495          * from any of them, if only some are enabled we reply
1496          * only from the non-enabled ones.
1497          */
1498         if (ignore_for_response == BIT(IEEE80211_NUM_ACS) - 1)
1499                 ignore_for_response = 0;
1500 
1501         ieee80211_sta_ps_deliver_response(sta, 1, ignore_for_response,
1502                                           IEEE80211_FRAME_RELEASE_PSPOLL);
1503 }
1504 
1505 void ieee80211_sta_ps_deliver_uapsd(struct sta_info *sta)
1506 {
1507         int n_frames = sta->sta.max_sp;
1508         u8 delivery_enabled = sta->sta.uapsd_queues;
1509 
1510         /*
1511          * If we ever grow support for TSPEC this might happen if
1512          * the TSPEC update from hostapd comes in between a trigger
1513          * frame setting WLAN_STA_UAPSD in the RX path and this
1514          * actually getting called.
1515          */
1516         if (!delivery_enabled)
1517                 return;
1518 
1519         switch (sta->sta.max_sp) {
1520         case 1:
1521                 n_frames = 2;
1522                 break;
1523         case 2:
1524                 n_frames = 4;
1525                 break;
1526         case 3:
1527                 n_frames = 6;
1528                 break;
1529         case 0:
1530                 /* XXX: what is a good value? */
1531                 n_frames = 8;
1532                 break;
1533         }
1534 
1535         ieee80211_sta_ps_deliver_response(sta, n_frames, ~delivery_enabled,
1536                                           IEEE80211_FRAME_RELEASE_UAPSD);
1537 }
1538 
1539 void ieee80211_sta_block_awake(struct ieee80211_hw *hw,
1540                                struct ieee80211_sta *pubsta, bool block)
1541 {
1542         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1543 
1544         trace_api_sta_block_awake(sta->local, pubsta, block);
1545 
1546         if (block)
1547                 set_sta_flag(sta, WLAN_STA_PS_DRIVER);
1548         else if (test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1549                 ieee80211_queue_work(hw, &sta->drv_unblock_wk);
1550 }
1551 EXPORT_SYMBOL(ieee80211_sta_block_awake);
1552 
1553 void ieee80211_sta_eosp(struct ieee80211_sta *pubsta)
1554 {
1555         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1556         struct ieee80211_local *local = sta->local;
1557 
1558         trace_api_eosp(local, pubsta);
1559 
1560         clear_sta_flag(sta, WLAN_STA_SP);
1561 }
1562 EXPORT_SYMBOL(ieee80211_sta_eosp);
1563 
1564 void ieee80211_sta_set_buffered(struct ieee80211_sta *pubsta,
1565                                 u8 tid, bool buffered)
1566 {
1567         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1568 
1569         if (WARN_ON(tid >= IEEE80211_NUM_TIDS))
1570                 return;
1571 
1572         trace_api_sta_set_buffered(sta->local, pubsta, tid, buffered);
1573 
1574         if (buffered)
1575                 set_bit(tid, &sta->driver_buffered_tids);
1576         else
1577                 clear_bit(tid, &sta->driver_buffered_tids);
1578 
1579         sta_info_recalc_tim(sta);
1580 }
1581 EXPORT_SYMBOL(ieee80211_sta_set_buffered);
1582 
1583 int sta_info_move_state(struct sta_info *sta,
1584                         enum ieee80211_sta_state new_state)
1585 {
1586         might_sleep();
1587 
1588         if (sta->sta_state == new_state)
1589                 return 0;
1590 
1591         /* check allowed transitions first */
1592 
1593         switch (new_state) {
1594         case IEEE80211_STA_NONE:
1595                 if (sta->sta_state != IEEE80211_STA_AUTH)
1596                         return -EINVAL;
1597                 break;
1598         case IEEE80211_STA_AUTH:
1599                 if (sta->sta_state != IEEE80211_STA_NONE &&
1600                     sta->sta_state != IEEE80211_STA_ASSOC)
1601                         return -EINVAL;
1602                 break;
1603         case IEEE80211_STA_ASSOC:
1604                 if (sta->sta_state != IEEE80211_STA_AUTH &&
1605                     sta->sta_state != IEEE80211_STA_AUTHORIZED)
1606                         return -EINVAL;
1607                 break;
1608         case IEEE80211_STA_AUTHORIZED:
1609                 if (sta->sta_state != IEEE80211_STA_ASSOC)
1610                         return -EINVAL;
1611                 break;
1612         default:
1613                 WARN(1, "invalid state %d", new_state);
1614                 return -EINVAL;
1615         }
1616 
1617         sta_dbg(sta->sdata, "moving STA %pM to state %d\n",
1618                 sta->sta.addr, new_state);
1619 
1620         /*
1621          * notify the driver before the actual changes so it can
1622          * fail the transition
1623          */
1624         if (test_sta_flag(sta, WLAN_STA_INSERTED)) {
1625                 int err = drv_sta_state(sta->local, sta->sdata, sta,
1626                                         sta->sta_state, new_state);
1627                 if (err)
1628                         return err;
1629         }
1630 
1631         /* reflect the change in all state variables */
1632 
1633         switch (new_state) {
1634         case IEEE80211_STA_NONE:
1635                 if (sta->sta_state == IEEE80211_STA_AUTH)
1636                         clear_bit(WLAN_STA_AUTH, &sta->_flags);
1637                 break;
1638         case IEEE80211_STA_AUTH:
1639                 if (sta->sta_state == IEEE80211_STA_NONE)
1640                         set_bit(WLAN_STA_AUTH, &sta->_flags);
1641                 else if (sta->sta_state == IEEE80211_STA_ASSOC)
1642                         clear_bit(WLAN_STA_ASSOC, &sta->_flags);
1643                 break;
1644         case IEEE80211_STA_ASSOC:
1645                 if (sta->sta_state == IEEE80211_STA_AUTH) {
1646                         set_bit(WLAN_STA_ASSOC, &sta->_flags);
1647                 } else if (sta->sta_state == IEEE80211_STA_AUTHORIZED) {
1648                         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1649                             (sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1650                              !sta->sdata->u.vlan.sta))
1651                                 atomic_dec(&sta->sdata->bss->num_mcast_sta);
1652                         clear_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
1653                 }
1654                 break;
1655         case IEEE80211_STA_AUTHORIZED:
1656                 if (sta->sta_state == IEEE80211_STA_ASSOC) {
1657                         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1658                             (sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1659                              !sta->sdata->u.vlan.sta))
1660                                 atomic_inc(&sta->sdata->bss->num_mcast_sta);
1661                         set_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
1662                 }
1663                 break;
1664         default:
1665                 break;
1666         }
1667 
1668         sta->sta_state = new_state;
1669 
1670         return 0;
1671 }
1672 
1673 u8 sta_info_tx_streams(struct sta_info *sta)
1674 {
1675         struct ieee80211_sta_ht_cap *ht_cap = &sta->sta.ht_cap;
1676         u8 rx_streams;
1677 
1678         if (!sta->sta.ht_cap.ht_supported)
1679                 return 1;
1680 
1681         if (sta->sta.vht_cap.vht_supported) {
1682                 int i;
1683                 u16 tx_mcs_map =
1684                         le16_to_cpu(sta->sta.vht_cap.vht_mcs.tx_mcs_map);
1685 
1686                 for (i = 7; i >= 0; i--)
1687                         if ((tx_mcs_map & (0x3 << (i * 2))) !=
1688                             IEEE80211_VHT_MCS_NOT_SUPPORTED)
1689                                 return i + 1;
1690         }
1691 
1692         if (ht_cap->mcs.rx_mask[3])
1693                 rx_streams = 4;
1694         else if (ht_cap->mcs.rx_mask[2])
1695                 rx_streams = 3;
1696         else if (ht_cap->mcs.rx_mask[1])
1697                 rx_streams = 2;
1698         else
1699                 rx_streams = 1;
1700 
1701         if (!(ht_cap->mcs.tx_params & IEEE80211_HT_MCS_TX_RX_DIFF))
1702                 return rx_streams;
1703 
1704         return ((ht_cap->mcs.tx_params & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
1705                         >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1;
1706 }
1707 

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