Merge branch 'media_fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab...
[cris-mirror.git] / net / mac80211 / sta_info.c
blobc426504ed1cfeecddefb3589871668c02448326e
1 /*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 */
10 #include <linux/module.h>
11 #include <linux/init.h>
12 #include <linux/netdevice.h>
13 #include <linux/types.h>
14 #include <linux/slab.h>
15 #include <linux/skbuff.h>
16 #include <linux/if_arp.h>
17 #include <linux/timer.h>
18 #include <linux/rtnetlink.h>
20 #include <net/mac80211.h>
21 #include "ieee80211_i.h"
22 #include "driver-ops.h"
23 #include "rate.h"
24 #include "sta_info.h"
25 #include "debugfs_sta.h"
26 #include "mesh.h"
28 /**
29 * DOC: STA information lifetime rules
31 * STA info structures (&struct sta_info) are managed in a hash table
32 * for faster lookup and a list for iteration. They are managed using
33 * RCU, i.e. access to the list and hash table is protected by RCU.
35 * Upon allocating a STA info structure with sta_info_alloc(), the caller
36 * owns that structure. It must then insert it into the hash table using
37 * either sta_info_insert() or sta_info_insert_rcu(); only in the latter
38 * case (which acquires an rcu read section but must not be called from
39 * within one) will the pointer still be valid after the call. Note that
40 * the caller may not do much with the STA info before inserting it, in
41 * particular, it may not start any mesh peer link management or add
42 * encryption keys.
44 * When the insertion fails (sta_info_insert()) returns non-zero), the
45 * structure will have been freed by sta_info_insert()!
47 * Station entries are added by mac80211 when you establish a link with a
48 * peer. This means different things for the different type of interfaces
49 * we support. For a regular station this mean we add the AP sta when we
50 * receive an assocation response from the AP. For IBSS this occurs when
51 * get to know about a peer on the same IBSS. For WDS we add the sta for
52 * the peer imediately upon device open. When using AP mode we add stations
53 * for each respective station upon request from userspace through nl80211.
55 * In order to remove a STA info structure, various sta_info_destroy_*()
56 * calls are available.
58 * There is no concept of ownership on a STA entry, each structure is
59 * owned by the global hash table/list until it is removed. All users of
60 * the structure need to be RCU protected so that the structure won't be
61 * freed before they are done using it.
64 /* Caller must hold local->sta_lock */
65 static int sta_info_hash_del(struct ieee80211_local *local,
66 struct sta_info *sta)
68 struct sta_info *s;
70 s = local->sta_hash[STA_HASH(sta->sta.addr)];
71 if (!s)
72 return -ENOENT;
73 if (s == sta) {
74 rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)],
75 s->hnext);
76 return 0;
79 while (s->hnext && s->hnext != sta)
80 s = s->hnext;
81 if (s->hnext) {
82 rcu_assign_pointer(s->hnext, sta->hnext);
83 return 0;
86 return -ENOENT;
89 /* protected by RCU */
90 struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata,
91 const u8 *addr)
93 struct ieee80211_local *local = sdata->local;
94 struct sta_info *sta;
96 sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)],
97 rcu_read_lock_held() ||
98 lockdep_is_held(&local->sta_lock) ||
99 lockdep_is_held(&local->sta_mtx));
100 while (sta) {
101 if (sta->sdata == sdata &&
102 memcmp(sta->sta.addr, addr, ETH_ALEN) == 0)
103 break;
104 sta = rcu_dereference_check(sta->hnext,
105 rcu_read_lock_held() ||
106 lockdep_is_held(&local->sta_lock) ||
107 lockdep_is_held(&local->sta_mtx));
109 return sta;
113 * Get sta info either from the specified interface
114 * or from one of its vlans
116 struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata,
117 const u8 *addr)
119 struct ieee80211_local *local = sdata->local;
120 struct sta_info *sta;
122 sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)],
123 rcu_read_lock_held() ||
124 lockdep_is_held(&local->sta_lock) ||
125 lockdep_is_held(&local->sta_mtx));
126 while (sta) {
127 if ((sta->sdata == sdata ||
128 (sta->sdata->bss && sta->sdata->bss == sdata->bss)) &&
129 memcmp(sta->sta.addr, addr, ETH_ALEN) == 0)
130 break;
131 sta = rcu_dereference_check(sta->hnext,
132 rcu_read_lock_held() ||
133 lockdep_is_held(&local->sta_lock) ||
134 lockdep_is_held(&local->sta_mtx));
136 return sta;
139 struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
140 int idx)
142 struct ieee80211_local *local = sdata->local;
143 struct sta_info *sta;
144 int i = 0;
146 list_for_each_entry_rcu(sta, &local->sta_list, list) {
147 if (sdata != sta->sdata)
148 continue;
149 if (i < idx) {
150 ++i;
151 continue;
153 return sta;
156 return NULL;
160 * __sta_info_free - internal STA free helper
162 * @local: pointer to the global information
163 * @sta: STA info to free
165 * This function must undo everything done by sta_info_alloc()
166 * that may happen before sta_info_insert().
168 static void __sta_info_free(struct ieee80211_local *local,
169 struct sta_info *sta)
171 if (sta->rate_ctrl) {
172 rate_control_free_sta(sta);
173 rate_control_put(sta->rate_ctrl);
176 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
177 wiphy_debug(local->hw.wiphy, "Destroyed STA %pM\n", sta->sta.addr);
178 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
180 kfree(sta);
183 /* Caller must hold local->sta_lock */
184 static void sta_info_hash_add(struct ieee80211_local *local,
185 struct sta_info *sta)
187 sta->hnext = local->sta_hash[STA_HASH(sta->sta.addr)];
188 rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)], sta);
191 static void sta_unblock(struct work_struct *wk)
193 struct sta_info *sta;
195 sta = container_of(wk, struct sta_info, drv_unblock_wk);
197 if (sta->dead)
198 return;
200 if (!test_sta_flags(sta, WLAN_STA_PS_STA))
201 ieee80211_sta_ps_deliver_wakeup(sta);
202 else if (test_and_clear_sta_flags(sta, WLAN_STA_PSPOLL)) {
203 clear_sta_flags(sta, WLAN_STA_PS_DRIVER);
204 ieee80211_sta_ps_deliver_poll_response(sta);
205 } else
206 clear_sta_flags(sta, WLAN_STA_PS_DRIVER);
209 static int sta_prepare_rate_control(struct ieee80211_local *local,
210 struct sta_info *sta, gfp_t gfp)
212 if (local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)
213 return 0;
215 sta->rate_ctrl = rate_control_get(local->rate_ctrl);
216 sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl,
217 &sta->sta, gfp);
218 if (!sta->rate_ctrl_priv) {
219 rate_control_put(sta->rate_ctrl);
220 return -ENOMEM;
223 return 0;
226 struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
227 u8 *addr, gfp_t gfp)
229 struct ieee80211_local *local = sdata->local;
230 struct sta_info *sta;
231 int i;
233 sta = kzalloc(sizeof(*sta) + local->hw.sta_data_size, gfp);
234 if (!sta)
235 return NULL;
237 spin_lock_init(&sta->lock);
238 spin_lock_init(&sta->flaglock);
239 INIT_WORK(&sta->drv_unblock_wk, sta_unblock);
240 INIT_WORK(&sta->ampdu_mlme.work, ieee80211_ba_session_work);
241 mutex_init(&sta->ampdu_mlme.mtx);
243 memcpy(sta->sta.addr, addr, ETH_ALEN);
244 sta->local = local;
245 sta->sdata = sdata;
247 ewma_init(&sta->avg_signal, 1024, 8);
249 if (sta_prepare_rate_control(local, sta, gfp)) {
250 kfree(sta);
251 return NULL;
254 for (i = 0; i < STA_TID_NUM; i++) {
256 * timer_to_tid must be initialized with identity mapping
257 * to enable session_timer's data differentiation. See
258 * sta_rx_agg_session_timer_expired for usage.
260 sta->timer_to_tid[i] = i;
262 skb_queue_head_init(&sta->ps_tx_buf);
263 skb_queue_head_init(&sta->tx_filtered);
265 for (i = 0; i < NUM_RX_DATA_QUEUES; i++)
266 sta->last_seq_ctrl[i] = cpu_to_le16(USHRT_MAX);
268 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
269 wiphy_debug(local->hw.wiphy, "Allocated STA %pM\n", sta->sta.addr);
270 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
272 #ifdef CONFIG_MAC80211_MESH
273 sta->plink_state = PLINK_LISTEN;
274 init_timer(&sta->plink_timer);
275 #endif
277 return sta;
280 static int sta_info_finish_insert(struct sta_info *sta, bool async)
282 struct ieee80211_local *local = sta->local;
283 struct ieee80211_sub_if_data *sdata = sta->sdata;
284 struct station_info sinfo;
285 unsigned long flags;
286 int err = 0;
288 lockdep_assert_held(&local->sta_mtx);
290 /* notify driver */
291 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
292 sdata = container_of(sdata->bss,
293 struct ieee80211_sub_if_data,
294 u.ap);
295 err = drv_sta_add(local, sdata, &sta->sta);
296 if (err) {
297 if (!async)
298 return err;
299 printk(KERN_DEBUG "%s: failed to add IBSS STA %pM to driver (%d)"
300 " - keeping it anyway.\n",
301 sdata->name, sta->sta.addr, err);
302 } else {
303 sta->uploaded = true;
304 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
305 if (async)
306 wiphy_debug(local->hw.wiphy,
307 "Finished adding IBSS STA %pM\n",
308 sta->sta.addr);
309 #endif
312 sdata = sta->sdata;
314 if (!async) {
315 local->num_sta++;
316 local->sta_generation++;
317 smp_mb();
319 /* make the station visible */
320 spin_lock_irqsave(&local->sta_lock, flags);
321 sta_info_hash_add(local, sta);
322 spin_unlock_irqrestore(&local->sta_lock, flags);
325 list_add(&sta->list, &local->sta_list);
327 ieee80211_sta_debugfs_add(sta);
328 rate_control_add_sta_debugfs(sta);
330 sinfo.filled = 0;
331 sinfo.generation = local->sta_generation;
332 cfg80211_new_sta(sdata->dev, sta->sta.addr, &sinfo, GFP_KERNEL);
335 return 0;
338 static void sta_info_finish_pending(struct ieee80211_local *local)
340 struct sta_info *sta;
341 unsigned long flags;
343 spin_lock_irqsave(&local->sta_lock, flags);
344 while (!list_empty(&local->sta_pending_list)) {
345 sta = list_first_entry(&local->sta_pending_list,
346 struct sta_info, list);
347 list_del(&sta->list);
348 spin_unlock_irqrestore(&local->sta_lock, flags);
350 sta_info_finish_insert(sta, true);
352 spin_lock_irqsave(&local->sta_lock, flags);
354 spin_unlock_irqrestore(&local->sta_lock, flags);
357 static void sta_info_finish_work(struct work_struct *work)
359 struct ieee80211_local *local =
360 container_of(work, struct ieee80211_local, sta_finish_work);
362 mutex_lock(&local->sta_mtx);
363 sta_info_finish_pending(local);
364 mutex_unlock(&local->sta_mtx);
367 int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU)
369 struct ieee80211_local *local = sta->local;
370 struct ieee80211_sub_if_data *sdata = sta->sdata;
371 unsigned long flags;
372 int err = 0;
375 * Can't be a WARN_ON because it can be triggered through a race:
376 * something inserts a STA (on one CPU) without holding the RTNL
377 * and another CPU turns off the net device.
379 if (unlikely(!ieee80211_sdata_running(sdata))) {
380 err = -ENETDOWN;
381 rcu_read_lock();
382 goto out_free;
385 if (WARN_ON(compare_ether_addr(sta->sta.addr, sdata->vif.addr) == 0 ||
386 is_multicast_ether_addr(sta->sta.addr))) {
387 err = -EINVAL;
388 rcu_read_lock();
389 goto out_free;
393 * In ad-hoc mode, we sometimes need to insert stations
394 * from tasklet context from the RX path. To avoid races,
395 * always do so in that case -- see the comment below.
397 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
398 spin_lock_irqsave(&local->sta_lock, flags);
399 /* check if STA exists already */
400 if (sta_info_get_bss(sdata, sta->sta.addr)) {
401 spin_unlock_irqrestore(&local->sta_lock, flags);
402 rcu_read_lock();
403 err = -EEXIST;
404 goto out_free;
407 local->num_sta++;
408 local->sta_generation++;
409 smp_mb();
410 sta_info_hash_add(local, sta);
412 list_add_tail(&sta->list, &local->sta_pending_list);
414 rcu_read_lock();
415 spin_unlock_irqrestore(&local->sta_lock, flags);
417 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
418 wiphy_debug(local->hw.wiphy, "Added IBSS STA %pM\n",
419 sta->sta.addr);
420 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
422 ieee80211_queue_work(&local->hw, &local->sta_finish_work);
424 return 0;
428 * On first glance, this will look racy, because the code
429 * below this point, which inserts a station with sleeping,
430 * unlocks the sta_lock between checking existence in the
431 * hash table and inserting into it.
433 * However, it is not racy against itself because it keeps
434 * the mutex locked. It still seems to race against the
435 * above code that atomically inserts the station... That,
436 * however, is not true because the above code can only
437 * be invoked for IBSS interfaces, and the below code will
438 * not be -- and the two do not race against each other as
439 * the hash table also keys off the interface.
442 might_sleep();
444 mutex_lock(&local->sta_mtx);
446 spin_lock_irqsave(&local->sta_lock, flags);
447 /* check if STA exists already */
448 if (sta_info_get_bss(sdata, sta->sta.addr)) {
449 spin_unlock_irqrestore(&local->sta_lock, flags);
450 mutex_unlock(&local->sta_mtx);
451 rcu_read_lock();
452 err = -EEXIST;
453 goto out_free;
456 spin_unlock_irqrestore(&local->sta_lock, flags);
458 err = sta_info_finish_insert(sta, false);
459 if (err) {
460 mutex_unlock(&local->sta_mtx);
461 rcu_read_lock();
462 goto out_free;
465 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
466 wiphy_debug(local->hw.wiphy, "Inserted STA %pM\n", sta->sta.addr);
467 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
469 /* move reference to rcu-protected */
470 rcu_read_lock();
471 mutex_unlock(&local->sta_mtx);
473 if (ieee80211_vif_is_mesh(&sdata->vif))
474 mesh_accept_plinks_update(sdata);
476 return 0;
477 out_free:
478 BUG_ON(!err);
479 __sta_info_free(local, sta);
480 return err;
483 int sta_info_insert(struct sta_info *sta)
485 int err = sta_info_insert_rcu(sta);
487 rcu_read_unlock();
489 return err;
492 static inline void __bss_tim_set(struct ieee80211_if_ap *bss, u16 aid)
495 * This format has been mandated by the IEEE specifications,
496 * so this line may not be changed to use the __set_bit() format.
498 bss->tim[aid / 8] |= (1 << (aid % 8));
501 static inline void __bss_tim_clear(struct ieee80211_if_ap *bss, u16 aid)
504 * This format has been mandated by the IEEE specifications,
505 * so this line may not be changed to use the __clear_bit() format.
507 bss->tim[aid / 8] &= ~(1 << (aid % 8));
510 static void __sta_info_set_tim_bit(struct ieee80211_if_ap *bss,
511 struct sta_info *sta)
513 BUG_ON(!bss);
515 __bss_tim_set(bss, sta->sta.aid);
517 if (sta->local->ops->set_tim) {
518 sta->local->tim_in_locked_section = true;
519 drv_set_tim(sta->local, &sta->sta, true);
520 sta->local->tim_in_locked_section = false;
524 void sta_info_set_tim_bit(struct sta_info *sta)
526 unsigned long flags;
528 BUG_ON(!sta->sdata->bss);
530 spin_lock_irqsave(&sta->local->sta_lock, flags);
531 __sta_info_set_tim_bit(sta->sdata->bss, sta);
532 spin_unlock_irqrestore(&sta->local->sta_lock, flags);
535 static void __sta_info_clear_tim_bit(struct ieee80211_if_ap *bss,
536 struct sta_info *sta)
538 BUG_ON(!bss);
540 __bss_tim_clear(bss, sta->sta.aid);
542 if (sta->local->ops->set_tim) {
543 sta->local->tim_in_locked_section = true;
544 drv_set_tim(sta->local, &sta->sta, false);
545 sta->local->tim_in_locked_section = false;
549 void sta_info_clear_tim_bit(struct sta_info *sta)
551 unsigned long flags;
553 BUG_ON(!sta->sdata->bss);
555 spin_lock_irqsave(&sta->local->sta_lock, flags);
556 __sta_info_clear_tim_bit(sta->sdata->bss, sta);
557 spin_unlock_irqrestore(&sta->local->sta_lock, flags);
560 static int sta_info_buffer_expired(struct sta_info *sta,
561 struct sk_buff *skb)
563 struct ieee80211_tx_info *info;
564 int timeout;
566 if (!skb)
567 return 0;
569 info = IEEE80211_SKB_CB(skb);
571 /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
572 timeout = (sta->listen_interval *
573 sta->sdata->vif.bss_conf.beacon_int *
574 32 / 15625) * HZ;
575 if (timeout < STA_TX_BUFFER_EXPIRE)
576 timeout = STA_TX_BUFFER_EXPIRE;
577 return time_after(jiffies, info->control.jiffies + timeout);
581 static bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
582 struct sta_info *sta)
584 unsigned long flags;
585 struct sk_buff *skb;
586 struct ieee80211_sub_if_data *sdata;
588 if (skb_queue_empty(&sta->ps_tx_buf))
589 return false;
591 for (;;) {
592 spin_lock_irqsave(&sta->ps_tx_buf.lock, flags);
593 skb = skb_peek(&sta->ps_tx_buf);
594 if (sta_info_buffer_expired(sta, skb))
595 skb = __skb_dequeue(&sta->ps_tx_buf);
596 else
597 skb = NULL;
598 spin_unlock_irqrestore(&sta->ps_tx_buf.lock, flags);
600 if (!skb)
601 break;
603 sdata = sta->sdata;
604 local->total_ps_buffered--;
605 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
606 printk(KERN_DEBUG "Buffered frame expired (STA %pM)\n",
607 sta->sta.addr);
608 #endif
609 dev_kfree_skb(skb);
611 if (skb_queue_empty(&sta->ps_tx_buf))
612 sta_info_clear_tim_bit(sta);
615 return true;
618 static int __must_check __sta_info_destroy(struct sta_info *sta)
620 struct ieee80211_local *local;
621 struct ieee80211_sub_if_data *sdata;
622 struct sk_buff *skb;
623 unsigned long flags;
624 int ret, i;
626 might_sleep();
628 if (!sta)
629 return -ENOENT;
631 local = sta->local;
632 sdata = sta->sdata;
635 * Before removing the station from the driver and
636 * rate control, it might still start new aggregation
637 * sessions -- block that to make sure the tear-down
638 * will be sufficient.
640 set_sta_flags(sta, WLAN_STA_BLOCK_BA);
641 ieee80211_sta_tear_down_BA_sessions(sta, true);
643 spin_lock_irqsave(&local->sta_lock, flags);
644 ret = sta_info_hash_del(local, sta);
645 /* this might still be the pending list ... which is fine */
646 if (!ret)
647 list_del(&sta->list);
648 spin_unlock_irqrestore(&local->sta_lock, flags);
649 if (ret)
650 return ret;
652 for (i = 0; i < NUM_DEFAULT_KEYS; i++)
653 ieee80211_key_free(local, sta->gtk[i]);
654 if (sta->ptk)
655 ieee80211_key_free(local, sta->ptk);
657 sta->dead = true;
659 if (test_and_clear_sta_flags(sta,
660 WLAN_STA_PS_STA | WLAN_STA_PS_DRIVER)) {
661 BUG_ON(!sdata->bss);
663 atomic_dec(&sdata->bss->num_sta_ps);
664 __sta_info_clear_tim_bit(sdata->bss, sta);
667 local->num_sta--;
668 local->sta_generation++;
670 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
671 rcu_assign_pointer(sdata->u.vlan.sta, NULL);
673 if (sta->uploaded) {
674 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
675 sdata = container_of(sdata->bss,
676 struct ieee80211_sub_if_data,
677 u.ap);
678 drv_sta_remove(local, sdata, &sta->sta);
679 sdata = sta->sdata;
683 * At this point, after we wait for an RCU grace period,
684 * neither mac80211 nor the driver can reference this
685 * sta struct any more except by still existing timers
686 * associated with this station that we clean up below.
688 synchronize_rcu();
690 #ifdef CONFIG_MAC80211_MESH
691 if (ieee80211_vif_is_mesh(&sdata->vif))
692 mesh_accept_plinks_update(sdata);
693 #endif
695 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
696 wiphy_debug(local->hw.wiphy, "Removed STA %pM\n", sta->sta.addr);
697 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
698 cancel_work_sync(&sta->drv_unblock_wk);
700 rate_control_remove_sta_debugfs(sta);
701 ieee80211_sta_debugfs_remove(sta);
703 #ifdef CONFIG_MAC80211_MESH
704 if (ieee80211_vif_is_mesh(&sta->sdata->vif)) {
705 mesh_plink_deactivate(sta);
706 del_timer_sync(&sta->plink_timer);
708 #endif
710 while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
711 local->total_ps_buffered--;
712 dev_kfree_skb_any(skb);
715 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL)
716 dev_kfree_skb_any(skb);
718 __sta_info_free(local, sta);
720 return 0;
723 int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, const u8 *addr)
725 struct sta_info *sta;
726 int ret;
728 mutex_lock(&sdata->local->sta_mtx);
729 sta = sta_info_get(sdata, addr);
730 ret = __sta_info_destroy(sta);
731 mutex_unlock(&sdata->local->sta_mtx);
733 return ret;
736 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
737 const u8 *addr)
739 struct sta_info *sta;
740 int ret;
742 mutex_lock(&sdata->local->sta_mtx);
743 sta = sta_info_get_bss(sdata, addr);
744 ret = __sta_info_destroy(sta);
745 mutex_unlock(&sdata->local->sta_mtx);
747 return ret;
750 static void sta_info_cleanup(unsigned long data)
752 struct ieee80211_local *local = (struct ieee80211_local *) data;
753 struct sta_info *sta;
754 bool timer_needed = false;
756 rcu_read_lock();
757 list_for_each_entry_rcu(sta, &local->sta_list, list)
758 if (sta_info_cleanup_expire_buffered(local, sta))
759 timer_needed = true;
760 rcu_read_unlock();
762 if (local->quiescing)
763 return;
765 if (!timer_needed)
766 return;
768 local->sta_cleanup.expires =
769 round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL);
770 add_timer(&local->sta_cleanup);
773 void sta_info_init(struct ieee80211_local *local)
775 spin_lock_init(&local->sta_lock);
776 mutex_init(&local->sta_mtx);
777 INIT_LIST_HEAD(&local->sta_list);
778 INIT_LIST_HEAD(&local->sta_pending_list);
779 INIT_WORK(&local->sta_finish_work, sta_info_finish_work);
781 setup_timer(&local->sta_cleanup, sta_info_cleanup,
782 (unsigned long)local);
783 local->sta_cleanup.expires =
784 round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL);
787 int sta_info_start(struct ieee80211_local *local)
789 add_timer(&local->sta_cleanup);
790 return 0;
793 void sta_info_stop(struct ieee80211_local *local)
795 del_timer(&local->sta_cleanup);
796 sta_info_flush(local, NULL);
800 * sta_info_flush - flush matching STA entries from the STA table
802 * Returns the number of removed STA entries.
804 * @local: local interface data
805 * @sdata: matching rule for the net device (sta->dev) or %NULL to match all STAs
807 int sta_info_flush(struct ieee80211_local *local,
808 struct ieee80211_sub_if_data *sdata)
810 struct sta_info *sta, *tmp;
811 int ret = 0;
813 might_sleep();
815 mutex_lock(&local->sta_mtx);
817 sta_info_finish_pending(local);
819 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
820 if (!sdata || sdata == sta->sdata)
821 WARN_ON(__sta_info_destroy(sta));
823 mutex_unlock(&local->sta_mtx);
825 return ret;
828 void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
829 unsigned long exp_time)
831 struct ieee80211_local *local = sdata->local;
832 struct sta_info *sta, *tmp;
834 mutex_lock(&local->sta_mtx);
835 list_for_each_entry_safe(sta, tmp, &local->sta_list, list)
836 if (time_after(jiffies, sta->last_rx + exp_time)) {
837 #ifdef CONFIG_MAC80211_IBSS_DEBUG
838 printk(KERN_DEBUG "%s: expiring inactive STA %pM\n",
839 sdata->name, sta->sta.addr);
840 #endif
841 WARN_ON(__sta_info_destroy(sta));
843 mutex_unlock(&local->sta_mtx);
846 struct ieee80211_sta *ieee80211_find_sta_by_ifaddr(struct ieee80211_hw *hw,
847 const u8 *addr,
848 const u8 *localaddr)
850 struct sta_info *sta, *nxt;
853 * Just return a random station if localaddr is NULL
854 * ... first in list.
856 for_each_sta_info(hw_to_local(hw), addr, sta, nxt) {
857 if (localaddr &&
858 compare_ether_addr(sta->sdata->vif.addr, localaddr) != 0)
859 continue;
860 if (!sta->uploaded)
861 return NULL;
862 return &sta->sta;
865 return NULL;
867 EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr);
869 struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif,
870 const u8 *addr)
872 struct sta_info *sta;
874 if (!vif)
875 return NULL;
877 sta = sta_info_get_bss(vif_to_sdata(vif), addr);
878 if (!sta)
879 return NULL;
881 if (!sta->uploaded)
882 return NULL;
884 return &sta->sta;
886 EXPORT_SYMBOL(ieee80211_find_sta);
888 static void clear_sta_ps_flags(void *_sta)
890 struct sta_info *sta = _sta;
892 clear_sta_flags(sta, WLAN_STA_PS_DRIVER | WLAN_STA_PS_STA);
895 /* powersave support code */
896 void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta)
898 struct ieee80211_sub_if_data *sdata = sta->sdata;
899 struct ieee80211_local *local = sdata->local;
900 int sent, buffered;
902 drv_sta_notify(local, sdata, STA_NOTIFY_AWAKE, &sta->sta);
904 if (!skb_queue_empty(&sta->ps_tx_buf))
905 sta_info_clear_tim_bit(sta);
907 /* Send all buffered frames to the station */
908 sent = ieee80211_add_pending_skbs(local, &sta->tx_filtered);
909 buffered = ieee80211_add_pending_skbs_fn(local, &sta->ps_tx_buf,
910 clear_sta_ps_flags, sta);
911 sent += buffered;
912 local->total_ps_buffered -= buffered;
914 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
915 printk(KERN_DEBUG "%s: STA %pM aid %d sending %d filtered/%d PS frames "
916 "since STA not sleeping anymore\n", sdata->name,
917 sta->sta.addr, sta->sta.aid, sent - buffered, buffered);
918 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
921 void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta)
923 struct ieee80211_sub_if_data *sdata = sta->sdata;
924 struct ieee80211_local *local = sdata->local;
925 struct sk_buff *skb;
926 int no_pending_pkts;
928 skb = skb_dequeue(&sta->tx_filtered);
929 if (!skb) {
930 skb = skb_dequeue(&sta->ps_tx_buf);
931 if (skb)
932 local->total_ps_buffered--;
934 no_pending_pkts = skb_queue_empty(&sta->tx_filtered) &&
935 skb_queue_empty(&sta->ps_tx_buf);
937 if (skb) {
938 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
939 struct ieee80211_hdr *hdr =
940 (struct ieee80211_hdr *) skb->data;
943 * Tell TX path to send this frame even though the STA may
944 * still remain is PS mode after this frame exchange.
946 info->flags |= IEEE80211_TX_CTL_PSPOLL_RESPONSE;
948 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
949 printk(KERN_DEBUG "STA %pM aid %d: PS Poll (entries after %d)\n",
950 sta->sta.addr, sta->sta.aid,
951 skb_queue_len(&sta->ps_tx_buf));
952 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
954 /* Use MoreData flag to indicate whether there are more
955 * buffered frames for this STA */
956 if (no_pending_pkts)
957 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
958 else
959 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
961 ieee80211_add_pending_skb(local, skb);
963 if (no_pending_pkts)
964 sta_info_clear_tim_bit(sta);
965 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
966 } else {
968 * FIXME: This can be the result of a race condition between
969 * us expiring a frame and the station polling for it.
970 * Should we send it a null-func frame indicating we
971 * have nothing buffered for it?
973 printk(KERN_DEBUG "%s: STA %pM sent PS Poll even "
974 "though there are no buffered frames for it\n",
975 sdata->name, sta->sta.addr);
976 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
980 void ieee80211_sta_block_awake(struct ieee80211_hw *hw,
981 struct ieee80211_sta *pubsta, bool block)
983 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
985 trace_api_sta_block_awake(sta->local, pubsta, block);
987 if (block)
988 set_sta_flags(sta, WLAN_STA_PS_DRIVER);
989 else if (test_sta_flags(sta, WLAN_STA_PS_DRIVER))
990 ieee80211_queue_work(hw, &sta->drv_unblock_wk);
992 EXPORT_SYMBOL(ieee80211_sta_block_awake);