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Linux/net/mac80211/sta_info.c

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  1 /*
  2  * Copyright 2002-2005, Instant802 Networks, Inc.
  3  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
  4  * Copyright 2013-2014  Intel Mobile Communications GmbH
  5  * Copyright (C) 2015 - 2017 Intel Deutschland GmbH
  6  *
  7  * This program is free software; you can redistribute it and/or modify
  8  * it under the terms of the GNU General Public License version 2 as
  9  * published by the Free Software Foundation.
 10  */
 11 
 12 #include <linux/module.h>
 13 #include <linux/init.h>
 14 #include <linux/etherdevice.h>
 15 #include <linux/netdevice.h>
 16 #include <linux/types.h>
 17 #include <linux/slab.h>
 18 #include <linux/skbuff.h>
 19 #include <linux/if_arp.h>
 20 #include <linux/timer.h>
 21 #include <linux/rtnetlink.h>
 22 
 23 #include <net/codel.h>
 24 #include <net/mac80211.h>
 25 #include "ieee80211_i.h"
 26 #include "driver-ops.h"
 27 #include "rate.h"
 28 #include "sta_info.h"
 29 #include "debugfs_sta.h"
 30 #include "mesh.h"
 31 #include "wme.h"
 32 
 33 /**
 34  * DOC: STA information lifetime rules
 35  *
 36  * STA info structures (&struct sta_info) are managed in a hash table
 37  * for faster lookup and a list for iteration. They are managed using
 38  * RCU, i.e. access to the list and hash table is protected by RCU.
 39  *
 40  * Upon allocating a STA info structure with sta_info_alloc(), the caller
 41  * owns that structure. It must then insert it into the hash table using
 42  * either sta_info_insert() or sta_info_insert_rcu(); only in the latter
 43  * case (which acquires an rcu read section but must not be called from
 44  * within one) will the pointer still be valid after the call. Note that
 45  * the caller may not do much with the STA info before inserting it, in
 46  * particular, it may not start any mesh peer link management or add
 47  * encryption keys.
 48  *
 49  * When the insertion fails (sta_info_insert()) returns non-zero), the
 50  * structure will have been freed by sta_info_insert()!
 51  *
 52  * Station entries are added by mac80211 when you establish a link with a
 53  * peer. This means different things for the different type of interfaces
 54  * we support. For a regular station this mean we add the AP sta when we
 55  * receive an association response from the AP. For IBSS this occurs when
 56  * get to know about a peer on the same IBSS. For WDS we add the sta for
 57  * the peer immediately upon device open. When using AP mode we add stations
 58  * for each respective station upon request from userspace through nl80211.
 59  *
 60  * In order to remove a STA info structure, various sta_info_destroy_*()
 61  * calls are available.
 62  *
 63  * There is no concept of ownership on a STA entry, each structure is
 64  * owned by the global hash table/list until it is removed. All users of
 65  * the structure need to be RCU protected so that the structure won't be
 66  * freed before they are done using it.
 67  */
 68 
 69 static const struct rhashtable_params sta_rht_params = {
 70         .nelem_hint = 3, /* start small */
 71         .automatic_shrinking = true,
 72         .head_offset = offsetof(struct sta_info, hash_node),
 73         .key_offset = offsetof(struct sta_info, addr),
 74         .key_len = ETH_ALEN,
 75         .max_size = CONFIG_MAC80211_STA_HASH_MAX_SIZE,
 76 };
 77 
 78 /* Caller must hold local->sta_mtx */
 79 static int sta_info_hash_del(struct ieee80211_local *local,
 80                              struct sta_info *sta)
 81 {
 82         return rhltable_remove(&local->sta_hash, &sta->hash_node,
 83                                sta_rht_params);
 84 }
 85 
 86 static void __cleanup_single_sta(struct sta_info *sta)
 87 {
 88         int ac, i;
 89         struct tid_ampdu_tx *tid_tx;
 90         struct ieee80211_sub_if_data *sdata = sta->sdata;
 91         struct ieee80211_local *local = sdata->local;
 92         struct fq *fq = &local->fq;
 93         struct ps_data *ps;
 94 
 95         if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
 96             test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
 97             test_sta_flag(sta, WLAN_STA_PS_DELIVER)) {
 98                 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
 99                     sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
100                         ps = &sdata->bss->ps;
101                 else if (ieee80211_vif_is_mesh(&sdata->vif))
102                         ps = &sdata->u.mesh.ps;
103                 else
104                         return;
105 
106                 clear_sta_flag(sta, WLAN_STA_PS_STA);
107                 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
108                 clear_sta_flag(sta, WLAN_STA_PS_DELIVER);
109 
110                 atomic_dec(&ps->num_sta_ps);
111         }
112 
113         if (sta->sta.txq[0]) {
114                 for (i = 0; i < ARRAY_SIZE(sta->sta.txq); i++) {
115                         struct txq_info *txqi = to_txq_info(sta->sta.txq[i]);
116 
117                         spin_lock_bh(&fq->lock);
118                         ieee80211_txq_purge(local, txqi);
119                         spin_unlock_bh(&fq->lock);
120                 }
121         }
122 
123         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
124                 local->total_ps_buffered -= skb_queue_len(&sta->ps_tx_buf[ac]);
125                 ieee80211_purge_tx_queue(&local->hw, &sta->ps_tx_buf[ac]);
126                 ieee80211_purge_tx_queue(&local->hw, &sta->tx_filtered[ac]);
127         }
128 
129         if (ieee80211_vif_is_mesh(&sdata->vif))
130                 mesh_sta_cleanup(sta);
131 
132         cancel_work_sync(&sta->drv_deliver_wk);
133 
134         /*
135          * Destroy aggregation state here. It would be nice to wait for the
136          * driver to finish aggregation stop and then clean up, but for now
137          * drivers have to handle aggregation stop being requested, followed
138          * directly by station destruction.
139          */
140         for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
141                 kfree(sta->ampdu_mlme.tid_start_tx[i]);
142                 tid_tx = rcu_dereference_raw(sta->ampdu_mlme.tid_tx[i]);
143                 if (!tid_tx)
144                         continue;
145                 ieee80211_purge_tx_queue(&local->hw, &tid_tx->pending);
146                 kfree(tid_tx);
147         }
148 }
149 
150 static void cleanup_single_sta(struct sta_info *sta)
151 {
152         struct ieee80211_sub_if_data *sdata = sta->sdata;
153         struct ieee80211_local *local = sdata->local;
154 
155         __cleanup_single_sta(sta);
156         sta_info_free(local, sta);
157 }
158 
159 struct rhlist_head *sta_info_hash_lookup(struct ieee80211_local *local,
160                                          const u8 *addr)
161 {
162         return rhltable_lookup(&local->sta_hash, addr, sta_rht_params);
163 }
164 
165 /* protected by RCU */
166 struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata,
167                               const u8 *addr)
168 {
169         struct ieee80211_local *local = sdata->local;
170         struct rhlist_head *tmp;
171         struct sta_info *sta;
172 
173         rcu_read_lock();
174         for_each_sta_info(local, addr, sta, tmp) {
175                 if (sta->sdata == sdata) {
176                         rcu_read_unlock();
177                         /* this is safe as the caller must already hold
178                          * another rcu read section or the mutex
179                          */
180                         return sta;
181                 }
182         }
183         rcu_read_unlock();
184         return NULL;
185 }
186 
187 /*
188  * Get sta info either from the specified interface
189  * or from one of its vlans
190  */
191 struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata,
192                                   const u8 *addr)
193 {
194         struct ieee80211_local *local = sdata->local;
195         struct rhlist_head *tmp;
196         struct sta_info *sta;
197 
198         rcu_read_lock();
199         for_each_sta_info(local, addr, sta, tmp) {
200                 if (sta->sdata == sdata ||
201                     (sta->sdata->bss && sta->sdata->bss == sdata->bss)) {
202                         rcu_read_unlock();
203                         /* this is safe as the caller must already hold
204                          * another rcu read section or the mutex
205                          */
206                         return sta;
207                 }
208         }
209         rcu_read_unlock();
210         return NULL;
211 }
212 
213 struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
214                                      int idx)
215 {
216         struct ieee80211_local *local = sdata->local;
217         struct sta_info *sta;
218         int i = 0;
219 
220         list_for_each_entry_rcu(sta, &local->sta_list, list) {
221                 if (sdata != sta->sdata)
222                         continue;
223                 if (i < idx) {
224                         ++i;
225                         continue;
226                 }
227                 return sta;
228         }
229 
230         return NULL;
231 }
232 
233 /**
234  * sta_info_free - free STA
235  *
236  * @local: pointer to the global information
237  * @sta: STA info to free
238  *
239  * This function must undo everything done by sta_info_alloc()
240  * that may happen before sta_info_insert(). It may only be
241  * called when sta_info_insert() has not been attempted (and
242  * if that fails, the station is freed anyway.)
243  */
244 void sta_info_free(struct ieee80211_local *local, struct sta_info *sta)
245 {
246         if (sta->rate_ctrl)
247                 rate_control_free_sta(sta);
248 
249         sta_dbg(sta->sdata, "Destroyed STA %pM\n", sta->sta.addr);
250 
251         if (sta->sta.txq[0])
252                 kfree(to_txq_info(sta->sta.txq[0]));
253         kfree(rcu_dereference_raw(sta->sta.rates));
254 #ifdef CONFIG_MAC80211_MESH
255         kfree(sta->mesh);
256 #endif
257         free_percpu(sta->pcpu_rx_stats);
258         kfree(sta);
259 }
260 
261 /* Caller must hold local->sta_mtx */
262 static int sta_info_hash_add(struct ieee80211_local *local,
263                              struct sta_info *sta)
264 {
265         return rhltable_insert(&local->sta_hash, &sta->hash_node,
266                                sta_rht_params);
267 }
268 
269 static void sta_deliver_ps_frames(struct work_struct *wk)
270 {
271         struct sta_info *sta;
272 
273         sta = container_of(wk, struct sta_info, drv_deliver_wk);
274 
275         if (sta->dead)
276                 return;
277 
278         local_bh_disable();
279         if (!test_sta_flag(sta, WLAN_STA_PS_STA))
280                 ieee80211_sta_ps_deliver_wakeup(sta);
281         else if (test_and_clear_sta_flag(sta, WLAN_STA_PSPOLL))
282                 ieee80211_sta_ps_deliver_poll_response(sta);
283         else if (test_and_clear_sta_flag(sta, WLAN_STA_UAPSD))
284                 ieee80211_sta_ps_deliver_uapsd(sta);
285         local_bh_enable();
286 }
287 
288 static int sta_prepare_rate_control(struct ieee80211_local *local,
289                                     struct sta_info *sta, gfp_t gfp)
290 {
291         if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL))
292                 return 0;
293 
294         sta->rate_ctrl = local->rate_ctrl;
295         sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl,
296                                                      sta, gfp);
297         if (!sta->rate_ctrl_priv)
298                 return -ENOMEM;
299 
300         return 0;
301 }
302 
303 struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
304                                 const u8 *addr, gfp_t gfp)
305 {
306         struct ieee80211_local *local = sdata->local;
307         struct ieee80211_hw *hw = &local->hw;
308         struct sta_info *sta;
309         int i;
310 
311         sta = kzalloc(sizeof(*sta) + hw->sta_data_size, gfp);
312         if (!sta)
313                 return NULL;
314 
315         if (ieee80211_hw_check(hw, USES_RSS)) {
316                 sta->pcpu_rx_stats =
317                         alloc_percpu_gfp(struct ieee80211_sta_rx_stats, gfp);
318                 if (!sta->pcpu_rx_stats)
319                         goto free;
320         }
321 
322         spin_lock_init(&sta->lock);
323         spin_lock_init(&sta->ps_lock);
324         INIT_WORK(&sta->drv_deliver_wk, sta_deliver_ps_frames);
325         INIT_WORK(&sta->ampdu_mlme.work, ieee80211_ba_session_work);
326         mutex_init(&sta->ampdu_mlme.mtx);
327 #ifdef CONFIG_MAC80211_MESH
328         if (ieee80211_vif_is_mesh(&sdata->vif)) {
329                 sta->mesh = kzalloc(sizeof(*sta->mesh), gfp);
330                 if (!sta->mesh)
331                         goto free;
332                 sta->mesh->plink_sta = sta;
333                 spin_lock_init(&sta->mesh->plink_lock);
334                 if (ieee80211_vif_is_mesh(&sdata->vif) &&
335                     !sdata->u.mesh.user_mpm)
336                         timer_setup(&sta->mesh->plink_timer, mesh_plink_timer,
337                                     0);
338                 sta->mesh->nonpeer_pm = NL80211_MESH_POWER_ACTIVE;
339         }
340 #endif
341 
342         memcpy(sta->addr, addr, ETH_ALEN);
343         memcpy(sta->sta.addr, addr, ETH_ALEN);
344         sta->sta.max_rx_aggregation_subframes =
345                 local->hw.max_rx_aggregation_subframes;
346 
347         sta->local = local;
348         sta->sdata = sdata;
349         sta->rx_stats.last_rx = jiffies;
350 
351         u64_stats_init(&sta->rx_stats.syncp);
352 
353         sta->sta_state = IEEE80211_STA_NONE;
354 
355         /* Mark TID as unreserved */
356         sta->reserved_tid = IEEE80211_TID_UNRESERVED;
357 
358         sta->last_connected = ktime_get_seconds();
359         ewma_signal_init(&sta->rx_stats_avg.signal);
360         for (i = 0; i < ARRAY_SIZE(sta->rx_stats_avg.chain_signal); i++)
361                 ewma_signal_init(&sta->rx_stats_avg.chain_signal[i]);
362 
363         if (local->ops->wake_tx_queue) {
364                 void *txq_data;
365                 int size = sizeof(struct txq_info) +
366                            ALIGN(hw->txq_data_size, sizeof(void *));
367 
368                 txq_data = kcalloc(ARRAY_SIZE(sta->sta.txq), size, gfp);
369                 if (!txq_data)
370                         goto free;
371 
372                 for (i = 0; i < ARRAY_SIZE(sta->sta.txq); i++) {
373                         struct txq_info *txq = txq_data + i * size;
374 
375                         ieee80211_txq_init(sdata, sta, txq, i);
376                 }
377         }
378 
379         if (sta_prepare_rate_control(local, sta, gfp))
380                 goto free_txq;
381 
382         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
383                 skb_queue_head_init(&sta->ps_tx_buf[i]);
384                 skb_queue_head_init(&sta->tx_filtered[i]);
385         }
386 
387         for (i = 0; i < IEEE80211_NUM_TIDS; i++)
388                 sta->last_seq_ctrl[i] = cpu_to_le16(USHRT_MAX);
389 
390         sta->sta.smps_mode = IEEE80211_SMPS_OFF;
391         if (sdata->vif.type == NL80211_IFTYPE_AP ||
392             sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
393                 struct ieee80211_supported_band *sband;
394                 u8 smps;
395 
396                 sband = ieee80211_get_sband(sdata);
397                 if (!sband)
398                         goto free_txq;
399 
400                 smps = (sband->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >>
401                         IEEE80211_HT_CAP_SM_PS_SHIFT;
402                 /*
403                  * Assume that hostapd advertises our caps in the beacon and
404                  * this is the known_smps_mode for a station that just assciated
405                  */
406                 switch (smps) {
407                 case WLAN_HT_SMPS_CONTROL_DISABLED:
408                         sta->known_smps_mode = IEEE80211_SMPS_OFF;
409                         break;
410                 case WLAN_HT_SMPS_CONTROL_STATIC:
411                         sta->known_smps_mode = IEEE80211_SMPS_STATIC;
412                         break;
413                 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
414                         sta->known_smps_mode = IEEE80211_SMPS_DYNAMIC;
415                         break;
416                 default:
417                         WARN_ON(1);
418                 }
419         }
420 
421         sta->sta.max_rc_amsdu_len = IEEE80211_MAX_MPDU_LEN_HT_BA;
422 
423         sta->cparams.ce_threshold = CODEL_DISABLED_THRESHOLD;
424         sta->cparams.target = MS2TIME(20);
425         sta->cparams.interval = MS2TIME(100);
426         sta->cparams.ecn = true;
427 
428         sta_dbg(sdata, "Allocated STA %pM\n", sta->sta.addr);
429 
430         return sta;
431 
432 free_txq:
433         if (sta->sta.txq[0])
434                 kfree(to_txq_info(sta->sta.txq[0]));
435 free:
436         free_percpu(sta->pcpu_rx_stats);
437 #ifdef CONFIG_MAC80211_MESH
438         kfree(sta->mesh);
439 #endif
440         kfree(sta);
441         return NULL;
442 }
443 
444 static int sta_info_insert_check(struct sta_info *sta)
445 {
446         struct ieee80211_sub_if_data *sdata = sta->sdata;
447 
448         /*
449          * Can't be a WARN_ON because it can be triggered through a race:
450          * something inserts a STA (on one CPU) without holding the RTNL
451          * and another CPU turns off the net device.
452          */
453         if (unlikely(!ieee80211_sdata_running(sdata)))
454                 return -ENETDOWN;
455 
456         if (WARN_ON(ether_addr_equal(sta->sta.addr, sdata->vif.addr) ||
457                     is_multicast_ether_addr(sta->sta.addr)))
458                 return -EINVAL;
459 
460         /* The RCU read lock is required by rhashtable due to
461          * asynchronous resize/rehash.  We also require the mutex
462          * for correctness.
463          */
464         rcu_read_lock();
465         lockdep_assert_held(&sdata->local->sta_mtx);
466         if (ieee80211_hw_check(&sdata->local->hw, NEEDS_UNIQUE_STA_ADDR) &&
467             ieee80211_find_sta_by_ifaddr(&sdata->local->hw, sta->addr, NULL)) {
468                 rcu_read_unlock();
469                 return -ENOTUNIQ;
470         }
471         rcu_read_unlock();
472 
473         return 0;
474 }
475 
476 static int sta_info_insert_drv_state(struct ieee80211_local *local,
477                                      struct ieee80211_sub_if_data *sdata,
478                                      struct sta_info *sta)
479 {
480         enum ieee80211_sta_state state;
481         int err = 0;
482 
483         for (state = IEEE80211_STA_NOTEXIST; state < sta->sta_state; state++) {
484                 err = drv_sta_state(local, sdata, sta, state, state + 1);
485                 if (err)
486                         break;
487         }
488 
489         if (!err) {
490                 /*
491                  * Drivers using legacy sta_add/sta_remove callbacks only
492                  * get uploaded set to true after sta_add is called.
493                  */
494                 if (!local->ops->sta_add)
495                         sta->uploaded = true;
496                 return 0;
497         }
498 
499         if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
500                 sdata_info(sdata,
501                            "failed to move IBSS STA %pM to state %d (%d) - keeping it anyway\n",
502                            sta->sta.addr, state + 1, err);
503                 err = 0;
504         }
505 
506         /* unwind on error */
507         for (; state > IEEE80211_STA_NOTEXIST; state--)
508                 WARN_ON(drv_sta_state(local, sdata, sta, state, state - 1));
509 
510         return err;
511 }
512 
513 static void
514 ieee80211_recalc_p2p_go_ps_allowed(struct ieee80211_sub_if_data *sdata)
515 {
516         struct ieee80211_local *local = sdata->local;
517         bool allow_p2p_go_ps = sdata->vif.p2p;
518         struct sta_info *sta;
519 
520         rcu_read_lock();
521         list_for_each_entry_rcu(sta, &local->sta_list, list) {
522                 if (sdata != sta->sdata ||
523                     !test_sta_flag(sta, WLAN_STA_ASSOC))
524                         continue;
525                 if (!sta->sta.support_p2p_ps) {
526                         allow_p2p_go_ps = false;
527                         break;
528                 }
529         }
530         rcu_read_unlock();
531 
532         if (allow_p2p_go_ps != sdata->vif.bss_conf.allow_p2p_go_ps) {
533                 sdata->vif.bss_conf.allow_p2p_go_ps = allow_p2p_go_ps;
534                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_P2P_PS);
535         }
536 }
537 
538 /*
539  * should be called with sta_mtx locked
540  * this function replaces the mutex lock
541  * with a RCU lock
542  */
543 static int sta_info_insert_finish(struct sta_info *sta) __acquires(RCU)
544 {
545         struct ieee80211_local *local = sta->local;
546         struct ieee80211_sub_if_data *sdata = sta->sdata;
547         struct station_info *sinfo = NULL;
548         int err = 0;
549 
550         lockdep_assert_held(&local->sta_mtx);
551 
552         /* check if STA exists already */
553         if (sta_info_get_bss(sdata, sta->sta.addr)) {
554                 err = -EEXIST;
555                 goto out_err;
556         }
557 
558         sinfo = kzalloc(sizeof(struct station_info), GFP_KERNEL);
559         if (!sinfo) {
560                 err = -ENOMEM;
561                 goto out_err;
562         }
563 
564         local->num_sta++;
565         local->sta_generation++;
566         smp_mb();
567 
568         /* simplify things and don't accept BA sessions yet */
569         set_sta_flag(sta, WLAN_STA_BLOCK_BA);
570 
571         /* make the station visible */
572         err = sta_info_hash_add(local, sta);
573         if (err)
574                 goto out_drop_sta;
575 
576         list_add_tail_rcu(&sta->list, &local->sta_list);
577 
578         /* notify driver */
579         err = sta_info_insert_drv_state(local, sdata, sta);
580         if (err)
581                 goto out_remove;
582 
583         set_sta_flag(sta, WLAN_STA_INSERTED);
584 
585         if (sta->sta_state >= IEEE80211_STA_ASSOC) {
586                 ieee80211_recalc_min_chandef(sta->sdata);
587                 if (!sta->sta.support_p2p_ps)
588                         ieee80211_recalc_p2p_go_ps_allowed(sta->sdata);
589         }
590 
591         /* accept BA sessions now */
592         clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
593 
594         ieee80211_sta_debugfs_add(sta);
595         rate_control_add_sta_debugfs(sta);
596 
597         sinfo->generation = local->sta_generation;
598         cfg80211_new_sta(sdata->dev, sta->sta.addr, sinfo, GFP_KERNEL);
599         kfree(sinfo);
600 
601         sta_dbg(sdata, "Inserted STA %pM\n", sta->sta.addr);
602 
603         /* move reference to rcu-protected */
604         rcu_read_lock();
605         mutex_unlock(&local->sta_mtx);
606 
607         if (ieee80211_vif_is_mesh(&sdata->vif))
608                 mesh_accept_plinks_update(sdata);
609 
610         return 0;
611  out_remove:
612         sta_info_hash_del(local, sta);
613         list_del_rcu(&sta->list);
614  out_drop_sta:
615         local->num_sta--;
616         synchronize_net();
617         __cleanup_single_sta(sta);
618  out_err:
619         mutex_unlock(&local->sta_mtx);
620         kfree(sinfo);
621         rcu_read_lock();
622         return err;
623 }
624 
625 int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU)
626 {
627         struct ieee80211_local *local = sta->local;
628         int err;
629 
630         might_sleep();
631 
632         mutex_lock(&local->sta_mtx);
633 
634         err = sta_info_insert_check(sta);
635         if (err) {
636                 mutex_unlock(&local->sta_mtx);
637                 rcu_read_lock();
638                 goto out_free;
639         }
640 
641         err = sta_info_insert_finish(sta);
642         if (err)
643                 goto out_free;
644 
645         return 0;
646  out_free:
647         sta_info_free(local, sta);
648         return err;
649 }
650 
651 int sta_info_insert(struct sta_info *sta)
652 {
653         int err = sta_info_insert_rcu(sta);
654 
655         rcu_read_unlock();
656 
657         return err;
658 }
659 
660 static inline void __bss_tim_set(u8 *tim, u16 id)
661 {
662         /*
663          * This format has been mandated by the IEEE specifications,
664          * so this line may not be changed to use the __set_bit() format.
665          */
666         tim[id / 8] |= (1 << (id % 8));
667 }
668 
669 static inline void __bss_tim_clear(u8 *tim, u16 id)
670 {
671         /*
672          * This format has been mandated by the IEEE specifications,
673          * so this line may not be changed to use the __clear_bit() format.
674          */
675         tim[id / 8] &= ~(1 << (id % 8));
676 }
677 
678 static inline bool __bss_tim_get(u8 *tim, u16 id)
679 {
680         /*
681          * This format has been mandated by the IEEE specifications,
682          * so this line may not be changed to use the test_bit() format.
683          */
684         return tim[id / 8] & (1 << (id % 8));
685 }
686 
687 static unsigned long ieee80211_tids_for_ac(int ac)
688 {
689         /* If we ever support TIDs > 7, this obviously needs to be adjusted */
690         switch (ac) {
691         case IEEE80211_AC_VO:
692                 return BIT(6) | BIT(7);
693         case IEEE80211_AC_VI:
694                 return BIT(4) | BIT(5);
695         case IEEE80211_AC_BE:
696                 return BIT(0) | BIT(3);
697         case IEEE80211_AC_BK:
698                 return BIT(1) | BIT(2);
699         default:
700                 WARN_ON(1);
701                 return 0;
702         }
703 }
704 
705 static void __sta_info_recalc_tim(struct sta_info *sta, bool ignore_pending)
706 {
707         struct ieee80211_local *local = sta->local;
708         struct ps_data *ps;
709         bool indicate_tim = false;
710         u8 ignore_for_tim = sta->sta.uapsd_queues;
711         int ac;
712         u16 id = sta->sta.aid;
713 
714         if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
715             sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
716                 if (WARN_ON_ONCE(!sta->sdata->bss))
717                         return;
718 
719                 ps = &sta->sdata->bss->ps;
720 #ifdef CONFIG_MAC80211_MESH
721         } else if (ieee80211_vif_is_mesh(&sta->sdata->vif)) {
722                 ps = &sta->sdata->u.mesh.ps;
723 #endif
724         } else {
725                 return;
726         }
727 
728         /* No need to do anything if the driver does all */
729         if (ieee80211_hw_check(&local->hw, AP_LINK_PS) && !local->ops->set_tim)
730                 return;
731 
732         if (sta->dead)
733                 goto done;
734 
735         /*
736          * If all ACs are delivery-enabled then we should build
737          * the TIM bit for all ACs anyway; if only some are then
738          * we ignore those and build the TIM bit using only the
739          * non-enabled ones.
740          */
741         if (ignore_for_tim == BIT(IEEE80211_NUM_ACS) - 1)
742                 ignore_for_tim = 0;
743 
744         if (ignore_pending)
745                 ignore_for_tim = BIT(IEEE80211_NUM_ACS) - 1;
746 
747         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
748                 unsigned long tids;
749 
750                 if (ignore_for_tim & ieee80211_ac_to_qos_mask[ac])
751                         continue;
752 
753                 indicate_tim |= !skb_queue_empty(&sta->tx_filtered[ac]) ||
754                                 !skb_queue_empty(&sta->ps_tx_buf[ac]);
755                 if (indicate_tim)
756                         break;
757 
758                 tids = ieee80211_tids_for_ac(ac);
759 
760                 indicate_tim |=
761                         sta->driver_buffered_tids & tids;
762                 indicate_tim |=
763                         sta->txq_buffered_tids & tids;
764         }
765 
766  done:
767         spin_lock_bh(&local->tim_lock);
768 
769         if (indicate_tim == __bss_tim_get(ps->tim, id))
770                 goto out_unlock;
771 
772         if (indicate_tim)
773                 __bss_tim_set(ps->tim, id);
774         else
775                 __bss_tim_clear(ps->tim, id);
776 
777         if (local->ops->set_tim && !WARN_ON(sta->dead)) {
778                 local->tim_in_locked_section = true;
779                 drv_set_tim(local, &sta->sta, indicate_tim);
780                 local->tim_in_locked_section = false;
781         }
782 
783 out_unlock:
784         spin_unlock_bh(&local->tim_lock);
785 }
786 
787 void sta_info_recalc_tim(struct sta_info *sta)
788 {
789         __sta_info_recalc_tim(sta, false);
790 }
791 
792 static bool sta_info_buffer_expired(struct sta_info *sta, struct sk_buff *skb)
793 {
794         struct ieee80211_tx_info *info;
795         int timeout;
796 
797         if (!skb)
798                 return false;
799 
800         info = IEEE80211_SKB_CB(skb);
801 
802         /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
803         timeout = (sta->listen_interval *
804                    sta->sdata->vif.bss_conf.beacon_int *
805                    32 / 15625) * HZ;
806         if (timeout < STA_TX_BUFFER_EXPIRE)
807                 timeout = STA_TX_BUFFER_EXPIRE;
808         return time_after(jiffies, info->control.jiffies + timeout);
809 }
810 
811 
812 static bool sta_info_cleanup_expire_buffered_ac(struct ieee80211_local *local,
813                                                 struct sta_info *sta, int ac)
814 {
815         unsigned long flags;
816         struct sk_buff *skb;
817 
818         /*
819          * First check for frames that should expire on the filtered
820          * queue. Frames here were rejected by the driver and are on
821          * a separate queue to avoid reordering with normal PS-buffered
822          * frames. They also aren't accounted for right now in the
823          * total_ps_buffered counter.
824          */
825         for (;;) {
826                 spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
827                 skb = skb_peek(&sta->tx_filtered[ac]);
828                 if (sta_info_buffer_expired(sta, skb))
829                         skb = __skb_dequeue(&sta->tx_filtered[ac]);
830                 else
831                         skb = NULL;
832                 spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
833 
834                 /*
835                  * Frames are queued in order, so if this one
836                  * hasn't expired yet we can stop testing. If
837                  * we actually reached the end of the queue we
838                  * also need to stop, of course.
839                  */
840                 if (!skb)
841                         break;
842                 ieee80211_free_txskb(&local->hw, skb);
843         }
844 
845         /*
846          * Now also check the normal PS-buffered queue, this will
847          * only find something if the filtered queue was emptied
848          * since the filtered frames are all before the normal PS
849          * buffered frames.
850          */
851         for (;;) {
852                 spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
853                 skb = skb_peek(&sta->ps_tx_buf[ac]);
854                 if (sta_info_buffer_expired(sta, skb))
855                         skb = __skb_dequeue(&sta->ps_tx_buf[ac]);
856                 else
857                         skb = NULL;
858                 spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
859 
860                 /*
861                  * frames are queued in order, so if this one
862                  * hasn't expired yet (or we reached the end of
863                  * the queue) we can stop testing
864                  */
865                 if (!skb)
866                         break;
867 
868                 local->total_ps_buffered--;
869                 ps_dbg(sta->sdata, "Buffered frame expired (STA %pM)\n",
870                        sta->sta.addr);
871                 ieee80211_free_txskb(&local->hw, skb);
872         }
873 
874         /*
875          * Finally, recalculate the TIM bit for this station -- it might
876          * now be clear because the station was too slow to retrieve its
877          * frames.
878          */
879         sta_info_recalc_tim(sta);
880 
881         /*
882          * Return whether there are any frames still buffered, this is
883          * used to check whether the cleanup timer still needs to run,
884          * if there are no frames we don't need to rearm the timer.
885          */
886         return !(skb_queue_empty(&sta->ps_tx_buf[ac]) &&
887                  skb_queue_empty(&sta->tx_filtered[ac]));
888 }
889 
890 static bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
891                                              struct sta_info *sta)
892 {
893         bool have_buffered = false;
894         int ac;
895 
896         /* This is only necessary for stations on BSS/MBSS interfaces */
897         if (!sta->sdata->bss &&
898             !ieee80211_vif_is_mesh(&sta->sdata->vif))
899                 return false;
900 
901         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
902                 have_buffered |=
903                         sta_info_cleanup_expire_buffered_ac(local, sta, ac);
904 
905         return have_buffered;
906 }
907 
908 static int __must_check __sta_info_destroy_part1(struct sta_info *sta)
909 {
910         struct ieee80211_local *local;
911         struct ieee80211_sub_if_data *sdata;
912         int ret;
913 
914         might_sleep();
915 
916         if (!sta)
917                 return -ENOENT;
918 
919         local = sta->local;
920         sdata = sta->sdata;
921 
922         lockdep_assert_held(&local->sta_mtx);
923 
924         /*
925          * Before removing the station from the driver and
926          * rate control, it might still start new aggregation
927          * sessions -- block that to make sure the tear-down
928          * will be sufficient.
929          */
930         set_sta_flag(sta, WLAN_STA_BLOCK_BA);
931         ieee80211_sta_tear_down_BA_sessions(sta, AGG_STOP_DESTROY_STA);
932 
933         /*
934          * Before removing the station from the driver there might be pending
935          * rx frames on RSS queues sent prior to the disassociation - wait for
936          * all such frames to be processed.
937          */
938         drv_sync_rx_queues(local, sta);
939 
940         ret = sta_info_hash_del(local, sta);
941         if (WARN_ON(ret))
942                 return ret;
943 
944         /*
945          * for TDLS peers, make sure to return to the base channel before
946          * removal.
947          */
948         if (test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) {
949                 drv_tdls_cancel_channel_switch(local, sdata, &sta->sta);
950                 clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
951         }
952 
953         list_del_rcu(&sta->list);
954         sta->removed = true;
955 
956         drv_sta_pre_rcu_remove(local, sta->sdata, sta);
957 
958         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
959             rcu_access_pointer(sdata->u.vlan.sta) == sta)
960                 RCU_INIT_POINTER(sdata->u.vlan.sta, NULL);
961 
962         return 0;
963 }
964 
965 static void __sta_info_destroy_part2(struct sta_info *sta)
966 {
967         struct ieee80211_local *local = sta->local;
968         struct ieee80211_sub_if_data *sdata = sta->sdata;
969         struct station_info *sinfo;
970         int ret;
971 
972         /*
973          * NOTE: This assumes at least synchronize_net() was done
974          *       after _part1 and before _part2!
975          */
976 
977         might_sleep();
978         lockdep_assert_held(&local->sta_mtx);
979 
980         /* now keys can no longer be reached */
981         ieee80211_free_sta_keys(local, sta);
982 
983         /* disable TIM bit - last chance to tell driver */
984         __sta_info_recalc_tim(sta, true);
985 
986         sta->dead = true;
987 
988         local->num_sta--;
989         local->sta_generation++;
990 
991         while (sta->sta_state > IEEE80211_STA_NONE) {
992                 ret = sta_info_move_state(sta, sta->sta_state - 1);
993                 if (ret) {
994                         WARN_ON_ONCE(1);
995                         break;
996                 }
997         }
998 
999         if (sta->uploaded) {
1000                 ret = drv_sta_state(local, sdata, sta, IEEE80211_STA_NONE,
1001                                     IEEE80211_STA_NOTEXIST);
1002                 WARN_ON_ONCE(ret != 0);
1003         }
1004 
1005         sta_dbg(sdata, "Removed STA %pM\n", sta->sta.addr);
1006 
1007         sinfo = kzalloc(sizeof(*sinfo), GFP_KERNEL);
1008         if (sinfo)
1009                 sta_set_sinfo(sta, sinfo);
1010         cfg80211_del_sta_sinfo(sdata->dev, sta->sta.addr, sinfo, GFP_KERNEL);
1011         kfree(sinfo);
1012 
1013         rate_control_remove_sta_debugfs(sta);
1014         ieee80211_sta_debugfs_remove(sta);
1015 
1016         cleanup_single_sta(sta);
1017 }
1018 
1019 int __must_check __sta_info_destroy(struct sta_info *sta)
1020 {
1021         int err = __sta_info_destroy_part1(sta);
1022 
1023         if (err)
1024                 return err;
1025 
1026         synchronize_net();
1027 
1028         __sta_info_destroy_part2(sta);
1029 
1030         return 0;
1031 }
1032 
1033 int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, const u8 *addr)
1034 {
1035         struct sta_info *sta;
1036         int ret;
1037 
1038         mutex_lock(&sdata->local->sta_mtx);
1039         sta = sta_info_get(sdata, addr);
1040         ret = __sta_info_destroy(sta);
1041         mutex_unlock(&sdata->local->sta_mtx);
1042 
1043         return ret;
1044 }
1045 
1046 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
1047                               const u8 *addr)
1048 {
1049         struct sta_info *sta;
1050         int ret;
1051 
1052         mutex_lock(&sdata->local->sta_mtx);
1053         sta = sta_info_get_bss(sdata, addr);
1054         ret = __sta_info_destroy(sta);
1055         mutex_unlock(&sdata->local->sta_mtx);
1056 
1057         return ret;
1058 }
1059 
1060 static void sta_info_cleanup(struct timer_list *t)
1061 {
1062         struct ieee80211_local *local = from_timer(local, t, sta_cleanup);
1063         struct sta_info *sta;
1064         bool timer_needed = false;
1065 
1066         rcu_read_lock();
1067         list_for_each_entry_rcu(sta, &local->sta_list, list)
1068                 if (sta_info_cleanup_expire_buffered(local, sta))
1069                         timer_needed = true;
1070         rcu_read_unlock();
1071 
1072         if (local->quiescing)
1073                 return;
1074 
1075         if (!timer_needed)
1076                 return;
1077 
1078         mod_timer(&local->sta_cleanup,
1079                   round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL));
1080 }
1081 
1082 int sta_info_init(struct ieee80211_local *local)
1083 {
1084         int err;
1085 
1086         err = rhltable_init(&local->sta_hash, &sta_rht_params);
1087         if (err)
1088                 return err;
1089 
1090         spin_lock_init(&local->tim_lock);
1091         mutex_init(&local->sta_mtx);
1092         INIT_LIST_HEAD(&local->sta_list);
1093 
1094         timer_setup(&local->sta_cleanup, sta_info_cleanup, 0);
1095         return 0;
1096 }
1097 
1098 void sta_info_stop(struct ieee80211_local *local)
1099 {
1100         del_timer_sync(&local->sta_cleanup);
1101         rhltable_destroy(&local->sta_hash);
1102 }
1103 
1104 
1105 int __sta_info_flush(struct ieee80211_sub_if_data *sdata, bool vlans)
1106 {
1107         struct ieee80211_local *local = sdata->local;
1108         struct sta_info *sta, *tmp;
1109         LIST_HEAD(free_list);
1110         int ret = 0;
1111 
1112         might_sleep();
1113 
1114         WARN_ON(vlans && sdata->vif.type != NL80211_IFTYPE_AP);
1115         WARN_ON(vlans && !sdata->bss);
1116 
1117         mutex_lock(&local->sta_mtx);
1118         list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1119                 if (sdata == sta->sdata ||
1120                     (vlans && sdata->bss == sta->sdata->bss)) {
1121                         if (!WARN_ON(__sta_info_destroy_part1(sta)))
1122                                 list_add(&sta->free_list, &free_list);
1123                         ret++;
1124                 }
1125         }
1126 
1127         if (!list_empty(&free_list)) {
1128                 synchronize_net();
1129                 list_for_each_entry_safe(sta, tmp, &free_list, free_list)
1130                         __sta_info_destroy_part2(sta);
1131         }
1132         mutex_unlock(&local->sta_mtx);
1133 
1134         return ret;
1135 }
1136 
1137 void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
1138                           unsigned long exp_time)
1139 {
1140         struct ieee80211_local *local = sdata->local;
1141         struct sta_info *sta, *tmp;
1142 
1143         mutex_lock(&local->sta_mtx);
1144 
1145         list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1146                 unsigned long last_active = ieee80211_sta_last_active(sta);
1147 
1148                 if (sdata != sta->sdata)
1149                         continue;
1150 
1151                 if (time_is_before_jiffies(last_active + exp_time)) {
1152                         sta_dbg(sta->sdata, "expiring inactive STA %pM\n",
1153                                 sta->sta.addr);
1154 
1155                         if (ieee80211_vif_is_mesh(&sdata->vif) &&
1156                             test_sta_flag(sta, WLAN_STA_PS_STA))
1157                                 atomic_dec(&sdata->u.mesh.ps.num_sta_ps);
1158 
1159                         WARN_ON(__sta_info_destroy(sta));
1160                 }
1161         }
1162 
1163         mutex_unlock(&local->sta_mtx);
1164 }
1165 
1166 struct ieee80211_sta *ieee80211_find_sta_by_ifaddr(struct ieee80211_hw *hw,
1167                                                    const u8 *addr,
1168                                                    const u8 *localaddr)
1169 {
1170         struct ieee80211_local *local = hw_to_local(hw);
1171         struct rhlist_head *tmp;
1172         struct sta_info *sta;
1173 
1174         /*
1175          * Just return a random station if localaddr is NULL
1176          * ... first in list.
1177          */
1178         for_each_sta_info(local, addr, sta, tmp) {
1179                 if (localaddr &&
1180                     !ether_addr_equal(sta->sdata->vif.addr, localaddr))
1181                         continue;
1182                 if (!sta->uploaded)
1183                         return NULL;
1184                 return &sta->sta;
1185         }
1186 
1187         return NULL;
1188 }
1189 EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr);
1190 
1191 struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif,
1192                                          const u8 *addr)
1193 {
1194         struct sta_info *sta;
1195 
1196         if (!vif)
1197                 return NULL;
1198 
1199         sta = sta_info_get_bss(vif_to_sdata(vif), addr);
1200         if (!sta)
1201                 return NULL;
1202 
1203         if (!sta->uploaded)
1204                 return NULL;
1205 
1206         return &sta->sta;
1207 }
1208 EXPORT_SYMBOL(ieee80211_find_sta);
1209 
1210 /* powersave support code */
1211 void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta)
1212 {
1213         struct ieee80211_sub_if_data *sdata = sta->sdata;
1214         struct ieee80211_local *local = sdata->local;
1215         struct sk_buff_head pending;
1216         int filtered = 0, buffered = 0, ac, i;
1217         unsigned long flags;
1218         struct ps_data *ps;
1219 
1220         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1221                 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
1222                                      u.ap);
1223 
1224         if (sdata->vif.type == NL80211_IFTYPE_AP)
1225                 ps = &sdata->bss->ps;
1226         else if (ieee80211_vif_is_mesh(&sdata->vif))
1227                 ps = &sdata->u.mesh.ps;
1228         else
1229                 return;
1230 
1231         clear_sta_flag(sta, WLAN_STA_SP);
1232 
1233         BUILD_BUG_ON(BITS_TO_LONGS(IEEE80211_NUM_TIDS) > 1);
1234         sta->driver_buffered_tids = 0;
1235         sta->txq_buffered_tids = 0;
1236 
1237         if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
1238                 drv_sta_notify(local, sdata, STA_NOTIFY_AWAKE, &sta->sta);
1239 
1240         if (sta->sta.txq[0]) {
1241                 for (i = 0; i < ARRAY_SIZE(sta->sta.txq); i++) {
1242                         if (!txq_has_queue(sta->sta.txq[i]))
1243                                 continue;
1244 
1245                         drv_wake_tx_queue(local, to_txq_info(sta->sta.txq[i]));
1246                 }
1247         }
1248 
1249         skb_queue_head_init(&pending);
1250 
1251         /* sync with ieee80211_tx_h_unicast_ps_buf */
1252         spin_lock(&sta->ps_lock);
1253         /* Send all buffered frames to the station */
1254         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1255                 int count = skb_queue_len(&pending), tmp;
1256 
1257                 spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
1258                 skb_queue_splice_tail_init(&sta->tx_filtered[ac], &pending);
1259                 spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
1260                 tmp = skb_queue_len(&pending);
1261                 filtered += tmp - count;
1262                 count = tmp;
1263 
1264                 spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
1265                 skb_queue_splice_tail_init(&sta->ps_tx_buf[ac], &pending);
1266                 spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
1267                 tmp = skb_queue_len(&pending);
1268                 buffered += tmp - count;
1269         }
1270 
1271         ieee80211_add_pending_skbs(local, &pending);
1272 
1273         /* now we're no longer in the deliver code */
1274         clear_sta_flag(sta, WLAN_STA_PS_DELIVER);
1275 
1276         /* The station might have polled and then woken up before we responded,
1277          * so clear these flags now to avoid them sticking around.
1278          */
1279         clear_sta_flag(sta, WLAN_STA_PSPOLL);
1280         clear_sta_flag(sta, WLAN_STA_UAPSD);
1281         spin_unlock(&sta->ps_lock);
1282 
1283         atomic_dec(&ps->num_sta_ps);
1284 
1285         /* This station just woke up and isn't aware of our SMPS state */
1286         if (!ieee80211_vif_is_mesh(&sdata->vif) &&
1287             !ieee80211_smps_is_restrictive(sta->known_smps_mode,
1288                                            sdata->smps_mode) &&
1289             sta->known_smps_mode != sdata->bss->req_smps &&
1290             sta_info_tx_streams(sta) != 1) {
1291                 ht_dbg(sdata,
1292                        "%pM just woke up and MIMO capable - update SMPS\n",
1293                        sta->sta.addr);
1294                 ieee80211_send_smps_action(sdata, sdata->bss->req_smps,
1295                                            sta->sta.addr,
1296                                            sdata->vif.bss_conf.bssid);
1297         }
1298 
1299         local->total_ps_buffered -= buffered;
1300 
1301         sta_info_recalc_tim(sta);
1302 
1303         ps_dbg(sdata,
1304                "STA %pM aid %d sending %d filtered/%d PS frames since STA woke up\n",
1305                sta->sta.addr, sta->sta.aid, filtered, buffered);
1306 
1307         ieee80211_check_fast_xmit(sta);
1308 }
1309 
1310 static void ieee80211_send_null_response(struct sta_info *sta, int tid,
1311                                          enum ieee80211_frame_release_type reason,
1312                                          bool call_driver, bool more_data)
1313 {
1314         struct ieee80211_sub_if_data *sdata = sta->sdata;
1315         struct ieee80211_local *local = sdata->local;
1316         struct ieee80211_qos_hdr *nullfunc;
1317         struct sk_buff *skb;
1318         int size = sizeof(*nullfunc);
1319         __le16 fc;
1320         bool qos = sta->sta.wme;
1321         struct ieee80211_tx_info *info;
1322         struct ieee80211_chanctx_conf *chanctx_conf;
1323 
1324         if (qos) {
1325                 fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1326                                  IEEE80211_STYPE_QOS_NULLFUNC |
1327                                  IEEE80211_FCTL_FROMDS);
1328         } else {
1329                 size -= 2;
1330                 fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1331                                  IEEE80211_STYPE_NULLFUNC |
1332                                  IEEE80211_FCTL_FROMDS);
1333         }
1334 
1335         skb = dev_alloc_skb(local->hw.extra_tx_headroom + size);
1336         if (!skb)
1337                 return;
1338 
1339         skb_reserve(skb, local->hw.extra_tx_headroom);
1340 
1341         nullfunc = skb_put(skb, size);
1342         nullfunc->frame_control = fc;
1343         nullfunc->duration_id = 0;
1344         memcpy(nullfunc->addr1, sta->sta.addr, ETH_ALEN);
1345         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
1346         memcpy(nullfunc->addr3, sdata->vif.addr, ETH_ALEN);
1347         nullfunc->seq_ctrl = 0;
1348 
1349         skb->priority = tid;
1350         skb_set_queue_mapping(skb, ieee802_1d_to_ac[tid]);
1351         if (qos) {
1352                 nullfunc->qos_ctrl = cpu_to_le16(tid);
1353 
1354                 if (reason == IEEE80211_FRAME_RELEASE_UAPSD) {
1355                         nullfunc->qos_ctrl |=
1356                                 cpu_to_le16(IEEE80211_QOS_CTL_EOSP);
1357                         if (more_data)
1358                                 nullfunc->frame_control |=
1359                                         cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1360                 }
1361         }
1362 
1363         info = IEEE80211_SKB_CB(skb);
1364 
1365         /*
1366          * Tell TX path to send this frame even though the
1367          * STA may still remain is PS mode after this frame
1368          * exchange. Also set EOSP to indicate this packet
1369          * ends the poll/service period.
1370          */
1371         info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER |
1372                        IEEE80211_TX_STATUS_EOSP |
1373                        IEEE80211_TX_CTL_REQ_TX_STATUS;
1374 
1375         info->control.flags |= IEEE80211_TX_CTRL_PS_RESPONSE;
1376 
1377         if (call_driver)
1378                 drv_allow_buffered_frames(local, sta, BIT(tid), 1,
1379                                           reason, false);
1380 
1381         skb->dev = sdata->dev;
1382 
1383         rcu_read_lock();
1384         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1385         if (WARN_ON(!chanctx_conf)) {
1386                 rcu_read_unlock();
1387                 kfree_skb(skb);
1388                 return;
1389         }
1390 
1391         info->band = chanctx_conf->def.chan->band;
1392         ieee80211_xmit(sdata, sta, skb);
1393         rcu_read_unlock();
1394 }
1395 
1396 static int find_highest_prio_tid(unsigned long tids)
1397 {
1398         /* lower 3 TIDs aren't ordered perfectly */
1399         if (tids & 0xF8)
1400                 return fls(tids) - 1;
1401         /* TID 0 is BE just like TID 3 */
1402         if (tids & BIT(0))
1403                 return 0;
1404         return fls(tids) - 1;
1405 }
1406 
1407 /* Indicates if the MORE_DATA bit should be set in the last
1408  * frame obtained by ieee80211_sta_ps_get_frames.
1409  * Note that driver_release_tids is relevant only if
1410  * reason = IEEE80211_FRAME_RELEASE_PSPOLL
1411  */
1412 static bool
1413 ieee80211_sta_ps_more_data(struct sta_info *sta, u8 ignored_acs,
1414                            enum ieee80211_frame_release_type reason,
1415                            unsigned long driver_release_tids)
1416 {
1417         int ac;
1418 
1419         /* If the driver has data on more than one TID then
1420          * certainly there's more data if we release just a
1421          * single frame now (from a single TID). This will
1422          * only happen for PS-Poll.
1423          */
1424         if (reason == IEEE80211_FRAME_RELEASE_PSPOLL &&
1425             hweight16(driver_release_tids) > 1)
1426                 return true;
1427 
1428         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1429                 if (ignored_acs & ieee80211_ac_to_qos_mask[ac])
1430                         continue;
1431 
1432                 if (!skb_queue_empty(&sta->tx_filtered[ac]) ||
1433                     !skb_queue_empty(&sta->ps_tx_buf[ac]))
1434                         return true;
1435         }
1436 
1437         return false;
1438 }
1439 
1440 static void
1441 ieee80211_sta_ps_get_frames(struct sta_info *sta, int n_frames, u8 ignored_acs,
1442                             enum ieee80211_frame_release_type reason,
1443                             struct sk_buff_head *frames,
1444                             unsigned long *driver_release_tids)
1445 {
1446         struct ieee80211_sub_if_data *sdata = sta->sdata;
1447         struct ieee80211_local *local = sdata->local;
1448         int ac;
1449 
1450         /* Get response frame(s) and more data bit for the last one. */
1451         for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1452                 unsigned long tids;
1453 
1454                 if (ignored_acs & ieee80211_ac_to_qos_mask[ac])
1455                         continue;
1456 
1457                 tids = ieee80211_tids_for_ac(ac);
1458 
1459                 /* if we already have frames from software, then we can't also
1460                  * release from hardware queues
1461                  */
1462                 if (skb_queue_empty(frames)) {
1463                         *driver_release_tids |=
1464                                 sta->driver_buffered_tids & tids;
1465                         *driver_release_tids |= sta->txq_buffered_tids & tids;
1466                 }
1467 
1468                 if (!*driver_release_tids) {
1469                         struct sk_buff *skb;
1470 
1471                         while (n_frames > 0) {
1472                                 skb = skb_dequeue(&sta->tx_filtered[ac]);
1473                                 if (!skb) {
1474                                         skb = skb_dequeue(
1475                                                 &sta->ps_tx_buf[ac]);
1476                                         if (skb)
1477                                                 local->total_ps_buffered--;
1478                                 }
1479                                 if (!skb)
1480                                         break;
1481                                 n_frames--;
1482                                 __skb_queue_tail(frames, skb);
1483                         }
1484                 }
1485 
1486                 /* If we have more frames buffered on this AC, then abort the
1487                  * loop since we can't send more data from other ACs before
1488                  * the buffered frames from this.
1489                  */
1490                 if (!skb_queue_empty(&sta->tx_filtered[ac]) ||
1491                     !skb_queue_empty(&sta->ps_tx_buf[ac]))
1492                         break;
1493         }
1494 }
1495 
1496 static void
1497 ieee80211_sta_ps_deliver_response(struct sta_info *sta,
1498                                   int n_frames, u8 ignored_acs,
1499                                   enum ieee80211_frame_release_type reason)
1500 {
1501         struct ieee80211_sub_if_data *sdata = sta->sdata;
1502         struct ieee80211_local *local = sdata->local;
1503         unsigned long driver_release_tids = 0;
1504         struct sk_buff_head frames;
1505         bool more_data;
1506 
1507         /* Service or PS-Poll period starts */
1508         set_sta_flag(sta, WLAN_STA_SP);
1509 
1510         __skb_queue_head_init(&frames);
1511 
1512         ieee80211_sta_ps_get_frames(sta, n_frames, ignored_acs, reason,
1513                                     &frames, &driver_release_tids);
1514 
1515         more_data = ieee80211_sta_ps_more_data(sta, ignored_acs, reason, driver_release_tids);
1516 
1517         if (driver_release_tids && reason == IEEE80211_FRAME_RELEASE_PSPOLL)
1518                 driver_release_tids =
1519                         BIT(find_highest_prio_tid(driver_release_tids));
1520 
1521         if (skb_queue_empty(&frames) && !driver_release_tids) {
1522                 int tid, ac;
1523 
1524                 /*
1525                  * For PS-Poll, this can only happen due to a race condition
1526                  * when we set the TIM bit and the station notices it, but
1527                  * before it can poll for the frame we expire it.
1528                  *
1529                  * For uAPSD, this is said in the standard (11.2.1.5 h):
1530                  *      At each unscheduled SP for a non-AP STA, the AP shall
1531                  *      attempt to transmit at least one MSDU or MMPDU, but no
1532                  *      more than the value specified in the Max SP Length field
1533                  *      in the QoS Capability element from delivery-enabled ACs,
1534                  *      that are destined for the non-AP STA.
1535                  *
1536                  * Since we have no other MSDU/MMPDU, transmit a QoS null frame.
1537                  */
1538 
1539                 /* This will evaluate to 1, 3, 5 or 7. */
1540                 for (ac = IEEE80211_AC_VO; ac < IEEE80211_NUM_ACS; ac++)
1541                         if (!(ignored_acs & ieee80211_ac_to_qos_mask[ac]))
1542                                 break;
1543                 tid = 7 - 2 * ac;
1544 
1545                 ieee80211_send_null_response(sta, tid, reason, true, false);
1546         } else if (!driver_release_tids) {
1547                 struct sk_buff_head pending;
1548                 struct sk_buff *skb;
1549                 int num = 0;
1550                 u16 tids = 0;
1551                 bool need_null = false;
1552 
1553                 skb_queue_head_init(&pending);
1554 
1555                 while ((skb = __skb_dequeue(&frames))) {
1556                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1557                         struct ieee80211_hdr *hdr = (void *) skb->data;
1558                         u8 *qoshdr = NULL;
1559 
1560                         num++;
1561 
1562                         /*
1563                          * Tell TX path to send this frame even though the
1564                          * STA may still remain is PS mode after this frame
1565                          * exchange.
1566                          */
1567                         info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
1568                         info->control.flags |= IEEE80211_TX_CTRL_PS_RESPONSE;
1569 
1570                         /*
1571                          * Use MoreData flag to indicate whether there are
1572                          * more buffered frames for this STA
1573                          */
1574                         if (more_data || !skb_queue_empty(&frames))
1575                                 hdr->frame_control |=
1576                                         cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1577                         else
1578                                 hdr->frame_control &=
1579                                         cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
1580 
1581                         if (ieee80211_is_data_qos(hdr->frame_control) ||
1582                             ieee80211_is_qos_nullfunc(hdr->frame_control))
1583                                 qoshdr = ieee80211_get_qos_ctl(hdr);
1584 
1585                         tids |= BIT(skb->priority);
1586 
1587                         __skb_queue_tail(&pending, skb);
1588 
1589                         /* end service period after last frame or add one */
1590                         if (!skb_queue_empty(&frames))
1591                                 continue;
1592 
1593                         if (reason != IEEE80211_FRAME_RELEASE_UAPSD) {
1594                                 /* for PS-Poll, there's only one frame */
1595                                 info->flags |= IEEE80211_TX_STATUS_EOSP |
1596                                                IEEE80211_TX_CTL_REQ_TX_STATUS;
1597                                 break;
1598                         }
1599 
1600                         /* For uAPSD, things are a bit more complicated. If the
1601                          * last frame has a QoS header (i.e. is a QoS-data or
1602                          * QoS-nulldata frame) then just set the EOSP bit there
1603                          * and be done.
1604                          * If the frame doesn't have a QoS header (which means
1605                          * it should be a bufferable MMPDU) then we can't set
1606                          * the EOSP bit in the QoS header; add a QoS-nulldata
1607                          * frame to the list to send it after the MMPDU.
1608                          *
1609                          * Note that this code is only in the mac80211-release
1610                          * code path, we assume that the driver will not buffer
1611                          * anything but QoS-data frames, or if it does, will
1612                          * create the QoS-nulldata frame by itself if needed.
1613                          *
1614                          * Cf. 802.11-2012 10.2.1.10 (c).
1615                          */
1616                         if (qoshdr) {
1617                                 *qoshdr |= IEEE80211_QOS_CTL_EOSP;
1618 
1619                                 info->flags |= IEEE80211_TX_STATUS_EOSP |
1620                                                IEEE80211_TX_CTL_REQ_TX_STATUS;
1621                         } else {
1622                                 /* The standard isn't completely clear on this
1623                                  * as it says the more-data bit should be set
1624                                  * if there are more BUs. The QoS-Null frame
1625                                  * we're about to send isn't buffered yet, we
1626                                  * only create it below, but let's pretend it
1627                                  * was buffered just in case some clients only
1628                                  * expect more-data=0 when eosp=1.
1629                                  */
1630                                 hdr->frame_control |=
1631                                         cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1632                                 need_null = true;
1633                                 num++;
1634                         }
1635                         break;
1636                 }
1637 
1638                 drv_allow_buffered_frames(local, sta, tids, num,
1639                                           reason, more_data);
1640 
1641                 ieee80211_add_pending_skbs(local, &pending);
1642 
1643                 if (need_null)
1644                         ieee80211_send_null_response(
1645                                 sta, find_highest_prio_tid(tids),
1646                                 reason, false, false);
1647 
1648                 sta_info_recalc_tim(sta);
1649         } else {
1650                 int tid;
1651 
1652                 /*
1653                  * We need to release a frame that is buffered somewhere in the
1654                  * driver ... it'll have to handle that.
1655                  * Note that the driver also has to check the number of frames
1656                  * on the TIDs we're releasing from - if there are more than
1657                  * n_frames it has to set the more-data bit (if we didn't ask
1658                  * it to set it anyway due to other buffered frames); if there
1659                  * are fewer than n_frames it has to make sure to adjust that
1660                  * to allow the service period to end properly.
1661                  */
1662                 drv_release_buffered_frames(local, sta, driver_release_tids,
1663                                             n_frames, reason, more_data);
1664 
1665                 /*
1666                  * Note that we don't recalculate the TIM bit here as it would
1667                  * most likely have no effect at all unless the driver told us
1668                  * that the TID(s) became empty before returning here from the
1669                  * release function.
1670                  * Either way, however, when the driver tells us that the TID(s)
1671                  * became empty or we find that a txq became empty, we'll do the
1672                  * TIM recalculation.
1673                  */
1674 
1675                 if (!sta->sta.txq[0])
1676                         return;
1677 
1678                 for (tid = 0; tid < ARRAY_SIZE(sta->sta.txq); tid++) {
1679                         if (!(driver_release_tids & BIT(tid)) ||
1680                             txq_has_queue(sta->sta.txq[tid]))
1681                                 continue;
1682 
1683                         sta_info_recalc_tim(sta);
1684                         break;
1685                 }
1686         }
1687 }
1688 
1689 void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta)
1690 {
1691         u8 ignore_for_response = sta->sta.uapsd_queues;
1692 
1693         /*
1694          * If all ACs are delivery-enabled then we should reply
1695          * from any of them, if only some are enabled we reply
1696          * only from the non-enabled ones.
1697          */
1698         if (ignore_for_response == BIT(IEEE80211_NUM_ACS) - 1)
1699                 ignore_for_response = 0;
1700 
1701         ieee80211_sta_ps_deliver_response(sta, 1, ignore_for_response,
1702                                           IEEE80211_FRAME_RELEASE_PSPOLL);
1703 }
1704 
1705 void ieee80211_sta_ps_deliver_uapsd(struct sta_info *sta)
1706 {
1707         int n_frames = sta->sta.max_sp;
1708         u8 delivery_enabled = sta->sta.uapsd_queues;
1709 
1710         /*
1711          * If we ever grow support for TSPEC this might happen if
1712          * the TSPEC update from hostapd comes in between a trigger
1713          * frame setting WLAN_STA_UAPSD in the RX path and this
1714          * actually getting called.
1715          */
1716         if (!delivery_enabled)
1717                 return;
1718 
1719         switch (sta->sta.max_sp) {
1720         case 1:
1721                 n_frames = 2;
1722                 break;
1723         case 2:
1724                 n_frames = 4;
1725                 break;
1726         case 3:
1727                 n_frames = 6;
1728                 break;
1729         case 0:
1730                 /* XXX: what is a good value? */
1731                 n_frames = 128;
1732                 break;
1733         }
1734 
1735         ieee80211_sta_ps_deliver_response(sta, n_frames, ~delivery_enabled,
1736                                           IEEE80211_FRAME_RELEASE_UAPSD);
1737 }
1738 
1739 void ieee80211_sta_block_awake(struct ieee80211_hw *hw,
1740                                struct ieee80211_sta *pubsta, bool block)
1741 {
1742         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1743 
1744         trace_api_sta_block_awake(sta->local, pubsta, block);
1745 
1746         if (block) {
1747                 set_sta_flag(sta, WLAN_STA_PS_DRIVER);
1748                 ieee80211_clear_fast_xmit(sta);
1749                 return;
1750         }
1751 
1752         if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1753                 return;
1754 
1755         if (!test_sta_flag(sta, WLAN_STA_PS_STA)) {
1756                 set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1757                 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
1758                 ieee80211_queue_work(hw, &sta->drv_deliver_wk);
1759         } else if (test_sta_flag(sta, WLAN_STA_PSPOLL) ||
1760                    test_sta_flag(sta, WLAN_STA_UAPSD)) {
1761                 /* must be asleep in this case */
1762                 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
1763                 ieee80211_queue_work(hw, &sta->drv_deliver_wk);
1764         } else {
1765                 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
1766                 ieee80211_check_fast_xmit(sta);
1767         }
1768 }
1769 EXPORT_SYMBOL(ieee80211_sta_block_awake);
1770 
1771 void ieee80211_sta_eosp(struct ieee80211_sta *pubsta)
1772 {
1773         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1774         struct ieee80211_local *local = sta->local;
1775 
1776         trace_api_eosp(local, pubsta);
1777 
1778         clear_sta_flag(sta, WLAN_STA_SP);
1779 }
1780 EXPORT_SYMBOL(ieee80211_sta_eosp);
1781 
1782 void ieee80211_send_eosp_nullfunc(struct ieee80211_sta *pubsta, int tid)
1783 {
1784         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1785         enum ieee80211_frame_release_type reason;
1786         bool more_data;
1787 
1788         trace_api_send_eosp_nullfunc(sta->local, pubsta, tid);
1789 
1790         reason = IEEE80211_FRAME_RELEASE_UAPSD;
1791         more_data = ieee80211_sta_ps_more_data(sta, ~sta->sta.uapsd_queues,
1792                                                reason, 0);
1793 
1794         ieee80211_send_null_response(sta, tid, reason, false, more_data);
1795 }
1796 EXPORT_SYMBOL(ieee80211_send_eosp_nullfunc);
1797 
1798 void ieee80211_sta_set_buffered(struct ieee80211_sta *pubsta,
1799                                 u8 tid, bool buffered)
1800 {
1801         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1802 
1803         if (WARN_ON(tid >= IEEE80211_NUM_TIDS))
1804                 return;
1805 
1806         trace_api_sta_set_buffered(sta->local, pubsta, tid, buffered);
1807 
1808         if (buffered)
1809                 set_bit(tid, &sta->driver_buffered_tids);
1810         else
1811                 clear_bit(tid, &sta->driver_buffered_tids);
1812 
1813         sta_info_recalc_tim(sta);
1814 }
1815 EXPORT_SYMBOL(ieee80211_sta_set_buffered);
1816 
1817 int sta_info_move_state(struct sta_info *sta,
1818                         enum ieee80211_sta_state new_state)
1819 {
1820         might_sleep();
1821 
1822         if (sta->sta_state == new_state)
1823                 return 0;
1824 
1825         /* check allowed transitions first */
1826 
1827         switch (new_state) {
1828         case IEEE80211_STA_NONE:
1829                 if (sta->sta_state != IEEE80211_STA_AUTH)
1830                         return -EINVAL;
1831                 break;
1832         case IEEE80211_STA_AUTH:
1833                 if (sta->sta_state != IEEE80211_STA_NONE &&
1834                     sta->sta_state != IEEE80211_STA_ASSOC)
1835                         return -EINVAL;
1836                 break;
1837         case IEEE80211_STA_ASSOC:
1838                 if (sta->sta_state != IEEE80211_STA_AUTH &&
1839                     sta->sta_state != IEEE80211_STA_AUTHORIZED)
1840                         return -EINVAL;
1841                 break;
1842         case IEEE80211_STA_AUTHORIZED:
1843                 if (sta->sta_state != IEEE80211_STA_ASSOC)
1844                         return -EINVAL;
1845                 break;
1846         default:
1847                 WARN(1, "invalid state %d", new_state);
1848                 return -EINVAL;
1849         }
1850 
1851         sta_dbg(sta->sdata, "moving STA %pM to state %d\n",
1852                 sta->sta.addr, new_state);
1853 
1854         /*
1855          * notify the driver before the actual changes so it can
1856          * fail the transition
1857          */
1858         if (test_sta_flag(sta, WLAN_STA_INSERTED)) {
1859                 int err = drv_sta_state(sta->local, sta->sdata, sta,
1860                                         sta->sta_state, new_state);
1861                 if (err)
1862                         return err;
1863         }
1864 
1865         /* reflect the change in all state variables */
1866 
1867         switch (new_state) {
1868         case IEEE80211_STA_NONE:
1869                 if (sta->sta_state == IEEE80211_STA_AUTH)
1870                         clear_bit(WLAN_STA_AUTH, &sta->_flags);
1871                 break;
1872         case IEEE80211_STA_AUTH:
1873                 if (sta->sta_state == IEEE80211_STA_NONE) {
1874                         set_bit(WLAN_STA_AUTH, &sta->_flags);
1875                 } else if (sta->sta_state == IEEE80211_STA_ASSOC) {
1876                         clear_bit(WLAN_STA_ASSOC, &sta->_flags);
1877                         ieee80211_recalc_min_chandef(sta->sdata);
1878                         if (!sta->sta.support_p2p_ps)
1879                                 ieee80211_recalc_p2p_go_ps_allowed(sta->sdata);
1880                 }
1881                 break;
1882         case IEEE80211_STA_ASSOC:
1883                 if (sta->sta_state == IEEE80211_STA_AUTH) {
1884                         set_bit(WLAN_STA_ASSOC, &sta->_flags);
1885                         ieee80211_recalc_min_chandef(sta->sdata);
1886                         if (!sta->sta.support_p2p_ps)
1887                                 ieee80211_recalc_p2p_go_ps_allowed(sta->sdata);
1888                 } else if (sta->sta_state == IEEE80211_STA_AUTHORIZED) {
1889                         ieee80211_vif_dec_num_mcast(sta->sdata);
1890                         clear_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
1891                         ieee80211_clear_fast_xmit(sta);
1892                         ieee80211_clear_fast_rx(sta);
1893                 }
1894                 break;
1895         case IEEE80211_STA_AUTHORIZED:
1896                 if (sta->sta_state == IEEE80211_STA_ASSOC) {
1897                         ieee80211_vif_inc_num_mcast(sta->sdata);
1898                         set_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
1899                         ieee80211_check_fast_xmit(sta);
1900                         ieee80211_check_fast_rx(sta);
1901                 }
1902                 break;
1903         default:
1904                 break;
1905         }
1906 
1907         sta->sta_state = new_state;
1908 
1909         return 0;
1910 }
1911 
1912 u8 sta_info_tx_streams(struct sta_info *sta)
1913 {
1914         struct ieee80211_sta_ht_cap *ht_cap = &sta->sta.ht_cap;
1915         u8 rx_streams;
1916 
1917         if (!sta->sta.ht_cap.ht_supported)
1918                 return 1;
1919 
1920         if (sta->sta.vht_cap.vht_supported) {
1921                 int i;
1922                 u16 tx_mcs_map =
1923                         le16_to_cpu(sta->sta.vht_cap.vht_mcs.tx_mcs_map);
1924 
1925                 for (i = 7; i >= 0; i--)
1926                         if ((tx_mcs_map & (0x3 << (i * 2))) !=
1927                             IEEE80211_VHT_MCS_NOT_SUPPORTED)
1928                                 return i + 1;
1929         }
1930 
1931         if (ht_cap->mcs.rx_mask[3])
1932                 rx_streams = 4;
1933         else if (ht_cap->mcs.rx_mask[2])
1934                 rx_streams = 3;
1935         else if (ht_cap->mcs.rx_mask[1])
1936                 rx_streams = 2;
1937         else
1938                 rx_streams = 1;
1939 
1940         if (!(ht_cap->mcs.tx_params & IEEE80211_HT_MCS_TX_RX_DIFF))
1941                 return rx_streams;
1942 
1943         return ((ht_cap->mcs.tx_params & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
1944                         >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1;
1945 }
1946 
1947 static struct ieee80211_sta_rx_stats *
1948 sta_get_last_rx_stats(struct sta_info *sta)
1949 {
1950         struct ieee80211_sta_rx_stats *stats = &sta->rx_stats;
1951         struct ieee80211_local *local = sta->local;
1952         int cpu;
1953 
1954         if (!ieee80211_hw_check(&local->hw, USES_RSS))
1955                 return stats;
1956 
1957         for_each_possible_cpu(cpu) {
1958                 struct ieee80211_sta_rx_stats *cpustats;
1959 
1960                 cpustats = per_cpu_ptr(sta->pcpu_rx_stats, cpu);
1961 
1962                 if (time_after(cpustats->last_rx, stats->last_rx))
1963                         stats = cpustats;
1964         }
1965 
1966         return stats;
1967 }
1968 
1969 static void sta_stats_decode_rate(struct ieee80211_local *local, u16 rate,
1970                                   struct rate_info *rinfo)
1971 {
1972         rinfo->bw = STA_STATS_GET(BW, rate);
1973 
1974         switch (STA_STATS_GET(TYPE, rate)) {
1975         case STA_STATS_RATE_TYPE_VHT:
1976                 rinfo->flags = RATE_INFO_FLAGS_VHT_MCS;
1977                 rinfo->mcs = STA_STATS_GET(VHT_MCS, rate);
1978                 rinfo->nss = STA_STATS_GET(VHT_NSS, rate);
1979                 if (STA_STATS_GET(SGI, rate))
1980                         rinfo->flags |= RATE_INFO_FLAGS_SHORT_GI;
1981                 break;
1982         case STA_STATS_RATE_TYPE_HT:
1983                 rinfo->flags = RATE_INFO_FLAGS_MCS;
1984                 rinfo->mcs = STA_STATS_GET(HT_MCS, rate);
1985                 if (STA_STATS_GET(SGI, rate))
1986                         rinfo->flags |= RATE_INFO_FLAGS_SHORT_GI;
1987                 break;
1988         case STA_STATS_RATE_TYPE_LEGACY: {
1989                 struct ieee80211_supported_band *sband;
1990                 u16 brate;
1991                 unsigned int shift;
1992                 int band = STA_STATS_GET(LEGACY_BAND, rate);
1993                 int rate_idx = STA_STATS_GET(LEGACY_IDX, rate);
1994 
1995                 rinfo->flags = 0;
1996                 sband = local->hw.wiphy->bands[band];
1997                 brate = sband->bitrates[rate_idx].bitrate;
1998                 if (rinfo->bw == RATE_INFO_BW_5)
1999                         shift = 2;
2000                 else if (rinfo->bw == RATE_INFO_BW_10)
2001                         shift = 1;
2002                 else
2003                         shift = 0;
2004                 rinfo->legacy = DIV_ROUND_UP(brate, 1 << shift);
2005                 break;
2006                 }
2007         }
2008 }
2009 
2010 static int sta_set_rate_info_rx(struct sta_info *sta, struct rate_info *rinfo)
2011 {
2012         u16 rate = READ_ONCE(sta_get_last_rx_stats(sta)->last_rate);
2013 
2014         if (rate == STA_STATS_RATE_INVALID)
2015                 return -EINVAL;
2016 
2017         sta_stats_decode_rate(sta->local, rate, rinfo);
2018         return 0;
2019 }
2020 
2021 static void sta_set_tidstats(struct sta_info *sta,
2022                              struct cfg80211_tid_stats *tidstats,
2023                              int tid)
2024 {
2025         struct ieee80211_local *local = sta->local;
2026 
2027         if (!(tidstats->filled & BIT(NL80211_TID_STATS_RX_MSDU))) {
2028                 unsigned int start;
2029 
2030                 do {
2031                         start = u64_stats_fetch_begin(&sta->rx_stats.syncp);
2032                         tidstats->rx_msdu = sta->rx_stats.msdu[tid];
2033                 } while (u64_stats_fetch_retry(&sta->rx_stats.syncp, start));
2034 
2035                 tidstats->filled |= BIT(NL80211_TID_STATS_RX_MSDU);
2036         }
2037 
2038         if (!(tidstats->filled & BIT(NL80211_TID_STATS_TX_MSDU))) {
2039                 tidstats->filled |= BIT(NL80211_TID_STATS_TX_MSDU);
2040                 tidstats->tx_msdu = sta->tx_stats.msdu[tid];
2041         }
2042 
2043         if (!(tidstats->filled & BIT(NL80211_TID_STATS_TX_MSDU_RETRIES)) &&
2044             ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
2045                 tidstats->filled |= BIT(NL80211_TID_STATS_TX_MSDU_RETRIES);
2046                 tidstats->tx_msdu_retries = sta->status_stats.msdu_retries[tid];
2047         }
2048 
2049         if (!(tidstats->filled & BIT(NL80211_TID_STATS_TX_MSDU_FAILED)) &&
2050             ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
2051                 tidstats->filled |= BIT(NL80211_TID_STATS_TX_MSDU_FAILED);
2052                 tidstats->tx_msdu_failed = sta->status_stats.msdu_failed[tid];
2053         }
2054 }
2055 
2056 static inline u64 sta_get_stats_bytes(struct ieee80211_sta_rx_stats *rxstats)
2057 {
2058         unsigned int start;
2059         u64 value;
2060 
2061         do {
2062                 start = u64_stats_fetch_begin(&rxstats->syncp);
2063                 value = rxstats->bytes;
2064         } while (u64_stats_fetch_retry(&rxstats->syncp, start));
2065 
2066         return value;
2067 }
2068 
2069 void sta_set_sinfo(struct sta_info *sta, struct station_info *sinfo)
2070 {
2071         struct ieee80211_sub_if_data *sdata = sta->sdata;
2072         struct ieee80211_local *local = sdata->local;
2073         u32 thr = 0;
2074         int i, ac, cpu;
2075         struct ieee80211_sta_rx_stats *last_rxstats;
2076 
2077         last_rxstats = sta_get_last_rx_stats(sta);
2078 
2079         sinfo->generation = sdata->local->sta_generation;
2080 
2081         /* do before driver, so beacon filtering drivers have a
2082          * chance to e.g. just add the number of filtered beacons
2083          * (or just modify the value entirely, of course)
2084          */
2085         if (sdata->vif.type == NL80211_IFTYPE_STATION)
2086                 sinfo->rx_beacon = sdata->u.mgd.count_beacon_signal;
2087 
2088         drv_sta_statistics(local, sdata, &sta->sta, sinfo);
2089 
2090         sinfo->filled |= BIT(NL80211_STA_INFO_INACTIVE_TIME) |
2091                          BIT(NL80211_STA_INFO_STA_FLAGS) |
2092                          BIT(NL80211_STA_INFO_BSS_PARAM) |
2093                          BIT(NL80211_STA_INFO_CONNECTED_TIME) |
2094                          BIT(NL80211_STA_INFO_RX_DROP_MISC);
2095 
2096         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2097                 sinfo->beacon_loss_count = sdata->u.mgd.beacon_loss_count;
2098                 sinfo->filled |= BIT(NL80211_STA_INFO_BEACON_LOSS);
2099         }
2100 
2101         sinfo->connected_time = ktime_get_seconds() - sta->last_connected;
2102         sinfo->inactive_time =
2103                 jiffies_to_msecs(jiffies - ieee80211_sta_last_active(sta));
2104 
2105         if (!(sinfo->filled & (BIT(NL80211_STA_INFO_TX_BYTES64) |
2106                                BIT(NL80211_STA_INFO_TX_BYTES)))) {
2107                 sinfo->tx_bytes = 0;
2108                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
2109                         sinfo->tx_bytes += sta->tx_stats.bytes[ac];
2110                 sinfo->filled |= BIT(NL80211_STA_INFO_TX_BYTES64);
2111         }
2112 
2113         if (!(sinfo->filled & BIT(NL80211_STA_INFO_TX_PACKETS))) {
2114                 sinfo->tx_packets = 0;
2115                 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
2116                         sinfo->tx_packets += sta->tx_stats.packets[ac];
2117                 sinfo->filled |= BIT(NL80211_STA_INFO_TX_PACKETS);
2118         }
2119 
2120         if (!(sinfo->filled & (BIT(NL80211_STA_INFO_RX_BYTES64) |
2121                                BIT(NL80211_STA_INFO_RX_BYTES)))) {
2122                 sinfo->rx_bytes += sta_get_stats_bytes(&sta->rx_stats);
2123 
2124                 if (sta->pcpu_rx_stats) {
2125                         for_each_possible_cpu(cpu) {
2126                                 struct ieee80211_sta_rx_stats *cpurxs;
2127 
2128                                 cpurxs = per_cpu_ptr(sta->pcpu_rx_stats, cpu);
2129                                 sinfo->rx_bytes += sta_get_stats_bytes(cpurxs);
2130                         }
2131                 }
2132 
2133                 sinfo->filled |= BIT(NL80211_STA_INFO_RX_BYTES64);
2134         }
2135 
2136         if (!(sinfo->filled & BIT(NL80211_STA_INFO_RX_PACKETS))) {
2137                 sinfo->rx_packets = sta->rx_stats.packets;
2138                 if (sta->pcpu_rx_stats) {
2139                         for_each_possible_cpu(cpu) {
2140                                 struct ieee80211_sta_rx_stats *cpurxs;
2141 
2142                                 cpurxs = per_cpu_ptr(sta->pcpu_rx_stats, cpu);
2143                                 sinfo->rx_packets += cpurxs->packets;
2144                         }
2145                 }
2146                 sinfo->filled |= BIT(NL80211_STA_INFO_RX_PACKETS);
2147         }
2148 
2149         if (!(sinfo->filled & BIT(NL80211_STA_INFO_TX_RETRIES))) {
2150                 sinfo->tx_retries = sta->status_stats.retry_count;
2151                 sinfo->filled |= BIT(NL80211_STA_INFO_TX_RETRIES);
2152         }
2153 
2154         if (!(sinfo->filled & BIT(NL80211_STA_INFO_TX_FAILED))) {
2155                 sinfo->tx_failed = sta->status_stats.retry_failed;
2156                 sinfo->filled |= BIT(NL80211_STA_INFO_TX_FAILED);
2157         }
2158 
2159         sinfo->rx_dropped_misc = sta->rx_stats.dropped;
2160         if (sta->pcpu_rx_stats) {
2161                 for_each_possible_cpu(cpu) {
2162                         struct ieee80211_sta_rx_stats *cpurxs;
2163 
2164                         cpurxs = per_cpu_ptr(sta->pcpu_rx_stats, cpu);
2165                         sinfo->rx_dropped_misc += cpurxs->dropped;
2166                 }
2167         }
2168 
2169         if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2170             !(sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)) {
2171                 sinfo->filled |= BIT(NL80211_STA_INFO_BEACON_RX) |
2172                                  BIT(NL80211_STA_INFO_BEACON_SIGNAL_AVG);
2173                 sinfo->rx_beacon_signal_avg = ieee80211_ave_rssi(&sdata->vif);
2174         }
2175 
2176         if (ieee80211_hw_check(&sta->local->hw, SIGNAL_DBM) ||
2177             ieee80211_hw_check(&sta->local->hw, SIGNAL_UNSPEC)) {
2178                 if (!(sinfo->filled & BIT(NL80211_STA_INFO_SIGNAL))) {
2179                         sinfo->signal = (s8)last_rxstats->last_signal;
2180                         sinfo->filled |= BIT(NL80211_STA_INFO_SIGNAL);
2181                 }
2182 
2183                 if (!sta->pcpu_rx_stats &&
2184                     !(sinfo->filled & BIT(NL80211_STA_INFO_SIGNAL_AVG))) {
2185                         sinfo->signal_avg =
2186                                 -ewma_signal_read(&sta->rx_stats_avg.signal);
2187                         sinfo->filled |= BIT(NL80211_STA_INFO_SIGNAL_AVG);
2188                 }
2189         }
2190 
2191         /* for the average - if pcpu_rx_stats isn't set - rxstats must point to
2192          * the sta->rx_stats struct, so the check here is fine with and without
2193          * pcpu statistics
2194          */
2195         if (last_rxstats->chains &&
2196             !(sinfo->filled & (BIT(NL80211_STA_INFO_CHAIN_SIGNAL) |
2197                                BIT(NL80211_STA_INFO_CHAIN_SIGNAL_AVG)))) {
2198                 sinfo->filled |= BIT(NL80211_STA_INFO_CHAIN_SIGNAL);
2199                 if (!sta->pcpu_rx_stats)
2200                         sinfo->filled |= BIT(NL80211_STA_INFO_CHAIN_SIGNAL_AVG);
2201 
2202                 sinfo->chains = last_rxstats->chains;
2203 
2204                 for (i = 0; i < ARRAY_SIZE(sinfo->chain_signal); i++) {
2205                         sinfo->chain_signal[i] =
2206                                 last_rxstats->chain_signal_last[i];
2207                         sinfo->chain_signal_avg[i] =
2208                                 -ewma_signal_read(&sta->rx_stats_avg.chain_signal[i]);
2209                 }
2210         }
2211 
2212         if (!(sinfo->filled & BIT(NL80211_STA_INFO_TX_BITRATE))) {
2213                 sta_set_rate_info_tx(sta, &sta->tx_stats.last_rate,
2214                                      &sinfo->txrate);
2215                 sinfo->filled |= BIT(NL80211_STA_INFO_TX_BITRATE);
2216         }
2217 
2218         if (!(sinfo->filled & BIT(NL80211_STA_INFO_RX_BITRATE))) {
2219                 if (sta_set_rate_info_rx(sta, &sinfo->rxrate) == 0)
2220                         sinfo->filled |= BIT(NL80211_STA_INFO_RX_BITRATE);
2221         }
2222 
2223         sinfo->filled |= BIT(NL80211_STA_INFO_TID_STATS);
2224         for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) {
2225                 struct cfg80211_tid_stats *tidstats = &sinfo->pertid[i];
2226 
2227                 sta_set_tidstats(sta, tidstats, i);
2228         }
2229 
2230         if (ieee80211_vif_is_mesh(&sdata->vif)) {
2231 #ifdef CONFIG_MAC80211_MESH
2232                 sinfo->filled |= BIT(NL80211_STA_INFO_LLID) |
2233                                  BIT(NL80211_STA_INFO_PLID) |
2234                                  BIT(NL80211_STA_INFO_PLINK_STATE) |
2235                                  BIT(NL80211_STA_INFO_LOCAL_PM) |
2236                                  BIT(NL80211_STA_INFO_PEER_PM) |
2237                                  BIT(NL80211_STA_INFO_NONPEER_PM);
2238 
2239                 sinfo->llid = sta->mesh->llid;
2240                 sinfo->plid = sta->mesh->plid;
2241                 sinfo->plink_state = sta->mesh->plink_state;
2242                 if (test_sta_flag(sta, WLAN_STA_TOFFSET_KNOWN)) {
2243                         sinfo->filled |= BIT(NL80211_STA_INFO_T_OFFSET);
2244                         sinfo->t_offset = sta->mesh->t_offset;
2245                 }
2246                 sinfo->local_pm = sta->mesh->local_pm;
2247                 sinfo->peer_pm = sta->mesh->peer_pm;
2248                 sinfo->nonpeer_pm = sta->mesh->nonpeer_pm;
2249 #endif
2250         }
2251 
2252         sinfo->bss_param.flags = 0;
2253         if (sdata->vif.bss_conf.use_cts_prot)
2254                 sinfo->bss_param.flags |= BSS_PARAM_FLAGS_CTS_PROT;
2255         if (sdata->vif.bss_conf.use_short_preamble)
2256                 sinfo->bss_param.flags |= BSS_PARAM_FLAGS_SHORT_PREAMBLE;
2257         if (sdata->vif.bss_conf.use_short_slot)
2258                 sinfo->bss_param.flags |= BSS_PARAM_FLAGS_SHORT_SLOT_TIME;
2259         sinfo->bss_param.dtim_period = sdata->vif.bss_conf.dtim_period;
2260         sinfo->bss_param.beacon_interval = sdata->vif.bss_conf.beacon_int;
2261 
2262         sinfo->sta_flags.set = 0;
2263         sinfo->sta_flags.mask = BIT(NL80211_STA_FLAG_AUTHORIZED) |
2264                                 BIT(NL80211_STA_FLAG_SHORT_PREAMBLE) |
2265                                 BIT(NL80211_STA_FLAG_WME) |
2266                                 BIT(NL80211_STA_FLAG_MFP) |
2267                                 BIT(NL80211_STA_FLAG_AUTHENTICATED) |
2268                                 BIT(NL80211_STA_FLAG_ASSOCIATED) |
2269                                 BIT(NL80211_STA_FLAG_TDLS_PEER);
2270         if (test_sta_flag(sta, WLAN_STA_AUTHORIZED))
2271                 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_AUTHORIZED);
2272         if (test_sta_flag(sta, WLAN_STA_SHORT_PREAMBLE))
2273                 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_SHORT_PREAMBLE);
2274         if (sta->sta.wme)
2275                 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_WME);
2276         if (test_sta_flag(sta, WLAN_STA_MFP))
2277                 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_MFP);
2278         if (test_sta_flag(sta, WLAN_STA_AUTH))
2279                 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_AUTHENTICATED);
2280         if (test_sta_flag(sta, WLAN_STA_ASSOC))
2281                 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_ASSOCIATED);
2282         if (test_sta_flag(sta, WLAN_STA_TDLS_PEER))
2283                 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_TDLS_PEER);
2284 
2285         thr = sta_get_expected_throughput(sta);
2286 
2287         if (thr != 0) {
2288                 sinfo->filled |= BIT(NL80211_STA_INFO_EXPECTED_THROUGHPUT);
2289                 sinfo->expected_throughput = thr;
2290         }
2291 
2292         if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_ACK_SIGNAL)) &&
2293             sta->status_stats.ack_signal_filled) {
2294                 sinfo->ack_signal = sta->status_stats.last_ack_signal;
2295                 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_ACK_SIGNAL);
2296         }
2297 }
2298 
2299 u32 sta_get_expected_throughput(struct sta_info *sta)
2300 {
2301         struct ieee80211_sub_if_data *sdata = sta->sdata;
2302         struct ieee80211_local *local = sdata->local;
2303         struct rate_control_ref *ref = NULL;
2304         u32 thr = 0;
2305 
2306         if (test_sta_flag(sta, WLAN_STA_RATE_CONTROL))
2307                 ref = local->rate_ctrl;
2308 
2309         /* check if the driver has a SW RC implementation */
2310         if (ref && ref->ops->get_expected_throughput)
2311                 thr = ref->ops->get_expected_throughput(sta->rate_ctrl_priv);
2312         else
2313                 thr = drv_get_expected_throughput(local, sta);
2314 
2315         return thr;
2316 }
2317 
2318 unsigned long ieee80211_sta_last_active(struct sta_info *sta)
2319 {
2320         struct ieee80211_sta_rx_stats *stats = sta_get_last_rx_stats(sta);
2321 
2322         if (time_after(stats->last_rx, sta->status_stats.last_ack))
2323                 return stats->last_rx;
2324         return sta->status_stats.last_ack;
2325 }
2326 
2327 static void sta_update_codel_params(struct sta_info *sta, u32 thr)
2328 {
2329         if (!sta->sdata->local->ops->wake_tx_queue)
2330                 return;
2331 
2332         if (thr && thr < STA_SLOW_THRESHOLD * sta->local->num_sta) {
2333                 sta->cparams.target = MS2TIME(50);
2334                 sta->cparams.interval = MS2TIME(300);
2335                 sta->cparams.ecn = false;
2336         } else {
2337                 sta->cparams.target = MS2TIME(20);
2338                 sta->cparams.interval = MS2TIME(100);
2339                 sta->cparams.ecn = true;
2340         }
2341 }
2342 
2343 void ieee80211_sta_set_expected_throughput(struct ieee80211_sta *pubsta,
2344                                            u32 thr)
2345 {
2346         struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
2347 
2348         sta_update_codel_params(sta, thr);
2349 }
2350 

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