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.
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"
24 #include "debugfs_sta.h"
28 * DOC: STA information lifetime rules
30 * STA info structures (&struct sta_info) are managed in a hash table
31 * for faster lookup and a list for iteration. They are managed using
32 * RCU, i.e. access to the list and hash table is protected by RCU.
34 * Upon allocating a STA info structure with sta_info_alloc(), the caller owns
35 * that structure. It must then either destroy it using sta_info_destroy()
36 * (which is pretty useless) or insert it into the hash table using
37 * sta_info_insert() which demotes the reference from ownership to a regular
38 * RCU-protected reference; if the function is called without protection by an
39 * RCU critical section the reference is instantly invalidated. Note that the
40 * caller may not do much with the STA info before inserting it, in particular,
41 * it may not start any mesh peer link management or add encryption keys.
43 * When the insertion fails (sta_info_insert()) returns non-zero), the
44 * structure will have been freed by sta_info_insert()!
46 * Because there are debugfs entries for each station, and adding those
47 * must be able to sleep, it is also possible to "pin" a station entry,
48 * that means it can be removed from the hash table but not be freed.
49 * See the comment in __sta_info_unlink() for more information, this is
50 * an internal capability only.
52 * In order to remove a STA info structure, the caller needs to first
53 * unlink it (sta_info_unlink()) from the list and hash tables and
54 * then destroy it; sta_info_destroy() will wait for an RCU grace period
55 * to elapse before actually freeing it. Due to the pinning and the
56 * possibility of multiple callers trying to remove the same STA info at
57 * the same time, sta_info_unlink() can clear the STA info pointer it is
58 * passed to indicate that the STA info is owned by somebody else now.
60 * If sta_info_unlink() did not clear the pointer then the caller owns
61 * the STA info structure now and is responsible of destroying it with
62 * a call to sta_info_destroy().
64 * In all other cases, there is no concept of ownership on a STA entry,
65 * each structure is owned by the global hash table/list until it is
66 * removed. All users of the structure need to be RCU protected so that
67 * the structure won't be freed before they are done using it.
70 /* Caller must hold local->sta_lock */
71 static int sta_info_hash_del(struct ieee80211_local
*local
,
76 s
= local
->sta_hash
[STA_HASH(sta
->sta
.addr
)];
80 rcu_assign_pointer(local
->sta_hash
[STA_HASH(sta
->sta
.addr
)],
85 while (s
->hnext
&& s
->hnext
!= sta
)
88 rcu_assign_pointer(s
->hnext
, sta
->hnext
);
95 /* protected by RCU */
96 struct sta_info
*sta_info_get(struct ieee80211_local
*local
, const u8
*addr
)
100 sta
= rcu_dereference(local
->sta_hash
[STA_HASH(addr
)]);
102 if (memcmp(sta
->sta
.addr
, addr
, ETH_ALEN
) == 0)
104 sta
= rcu_dereference(sta
->hnext
);
109 struct sta_info
*sta_info_get_by_idx(struct ieee80211_local
*local
, int idx
,
110 struct net_device
*dev
)
112 struct sta_info
*sta
;
115 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
) {
116 if (dev
&& dev
!= sta
->sdata
->dev
)
129 * __sta_info_free - internal STA free helper
131 * @local: pointer to the global information
132 * @sta: STA info to free
134 * This function must undo everything done by sta_info_alloc()
135 * that may happen before sta_info_insert().
137 static void __sta_info_free(struct ieee80211_local
*local
,
138 struct sta_info
*sta
)
140 rate_control_free_sta(sta
);
141 rate_control_put(sta
->rate_ctrl
);
143 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
144 printk(KERN_DEBUG
"%s: Destroyed STA %pM\n",
145 wiphy_name(local
->hw
.wiphy
), sta
->sta
.addr
);
146 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
151 void sta_info_destroy(struct sta_info
*sta
)
153 struct ieee80211_local
*local
;
164 rate_control_remove_sta_debugfs(sta
);
165 ieee80211_sta_debugfs_remove(sta
);
167 #ifdef CONFIG_MAC80211_MESH
168 if (ieee80211_vif_is_mesh(&sta
->sdata
->vif
))
169 mesh_plink_deactivate(sta
);
173 * We have only unlinked the key, and actually destroying it
174 * may mean it is removed from hardware which requires that
175 * the key->sta pointer is still valid, so flush the key todo
178 * ieee80211_key_todo() will synchronize_rcu() so after this
179 * nothing can reference this sta struct any more.
181 ieee80211_key_todo();
183 #ifdef CONFIG_MAC80211_MESH
184 if (ieee80211_vif_is_mesh(&sta
->sdata
->vif
))
185 del_timer_sync(&sta
->plink_timer
);
188 while ((skb
= skb_dequeue(&sta
->ps_tx_buf
)) != NULL
) {
189 local
->total_ps_buffered
--;
190 dev_kfree_skb_any(skb
);
193 while ((skb
= skb_dequeue(&sta
->tx_filtered
)) != NULL
)
194 dev_kfree_skb_any(skb
);
196 for (i
= 0; i
< STA_TID_NUM
; i
++) {
197 struct tid_ampdu_rx
*tid_rx
;
198 struct tid_ampdu_tx
*tid_tx
;
200 spin_lock_bh(&sta
->lock
);
201 tid_rx
= sta
->ampdu_mlme
.tid_rx
[i
];
202 /* Make sure timer won't free the tid_rx struct, see below */
204 tid_rx
->shutdown
= true;
207 * The stop callback cannot find this station any more, but
208 * it didn't complete its work -- start the queue if necessary
210 if (sta
->ampdu_mlme
.tid_state_tx
[i
] & HT_AGG_STATE_INITIATOR_MSK
&&
211 sta
->ampdu_mlme
.tid_state_tx
[i
] & HT_AGG_STATE_REQ_STOP_BA_MSK
&&
212 local
->hw
.ampdu_queues
)
213 ieee80211_wake_queue_by_reason(&local
->hw
,
214 local
->hw
.queues
+ sta
->tid_to_tx_q
[i
],
215 IEEE80211_QUEUE_STOP_REASON_AGGREGATION
);
217 spin_unlock_bh(&sta
->lock
);
220 * Outside spinlock - shutdown is true now so that the timer
221 * won't free tid_rx, we have to do that now. Can't let the
222 * timer do it because we have to sync the timer outside the
223 * lock that it takes itself.
226 del_timer_sync(&tid_rx
->session_timer
);
231 * No need to do such complications for TX agg sessions, the
232 * path leading to freeing the tid_tx struct goes via a call
233 * from the driver, and thus needs to look up the sta struct
234 * again, which cannot be found when we get here. Hence, we
235 * just need to delete the timer and free the aggregation
236 * info; we won't be telling the peer about it then but that
237 * doesn't matter if we're not talking to it again anyway.
239 tid_tx
= sta
->ampdu_mlme
.tid_tx
[i
];
241 del_timer_sync(&tid_tx
->addba_resp_timer
);
243 * STA removed while aggregation session being
244 * started? Bit odd, but purge frames anyway.
246 skb_queue_purge(&tid_tx
->pending
);
251 __sta_info_free(local
, sta
);
255 /* Caller must hold local->sta_lock */
256 static void sta_info_hash_add(struct ieee80211_local
*local
,
257 struct sta_info
*sta
)
259 sta
->hnext
= local
->sta_hash
[STA_HASH(sta
->sta
.addr
)];
260 rcu_assign_pointer(local
->sta_hash
[STA_HASH(sta
->sta
.addr
)], sta
);
263 struct sta_info
*sta_info_alloc(struct ieee80211_sub_if_data
*sdata
,
266 struct ieee80211_local
*local
= sdata
->local
;
267 struct sta_info
*sta
;
270 sta
= kzalloc(sizeof(*sta
) + local
->hw
.sta_data_size
, gfp
);
274 spin_lock_init(&sta
->lock
);
275 spin_lock_init(&sta
->flaglock
);
277 memcpy(sta
->sta
.addr
, addr
, ETH_ALEN
);
281 sta
->rate_ctrl
= rate_control_get(local
->rate_ctrl
);
282 sta
->rate_ctrl_priv
= rate_control_alloc_sta(sta
->rate_ctrl
,
284 if (!sta
->rate_ctrl_priv
) {
285 rate_control_put(sta
->rate_ctrl
);
290 for (i
= 0; i
< STA_TID_NUM
; i
++) {
291 /* timer_to_tid must be initialized with identity mapping to
292 * enable session_timer's data differentiation. refer to
293 * sta_rx_agg_session_timer_expired for useage */
294 sta
->timer_to_tid
[i
] = i
;
295 sta
->tid_to_tx_q
[i
] = -1;
297 sta
->ampdu_mlme
.tid_state_rx
[i
] = HT_AGG_STATE_IDLE
;
298 sta
->ampdu_mlme
.tid_rx
[i
] = NULL
;
300 sta
->ampdu_mlme
.tid_state_tx
[i
] = HT_AGG_STATE_IDLE
;
301 sta
->ampdu_mlme
.tid_tx
[i
] = NULL
;
302 sta
->ampdu_mlme
.addba_req_num
[i
] = 0;
304 skb_queue_head_init(&sta
->ps_tx_buf
);
305 skb_queue_head_init(&sta
->tx_filtered
);
307 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
308 printk(KERN_DEBUG
"%s: Allocated STA %pM\n",
309 wiphy_name(local
->hw
.wiphy
), sta
->sta
.addr
);
310 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
312 #ifdef CONFIG_MAC80211_MESH
313 sta
->plink_state
= PLINK_LISTEN
;
314 init_timer(&sta
->plink_timer
);
320 int sta_info_insert(struct sta_info
*sta
)
322 struct ieee80211_local
*local
= sta
->local
;
323 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
328 * Can't be a WARN_ON because it can be triggered through a race:
329 * something inserts a STA (on one CPU) without holding the RTNL
330 * and another CPU turns off the net device.
332 if (unlikely(!netif_running(sdata
->dev
))) {
337 if (WARN_ON(compare_ether_addr(sta
->sta
.addr
, sdata
->dev
->dev_addr
) == 0 ||
338 is_multicast_ether_addr(sta
->sta
.addr
))) {
343 spin_lock_irqsave(&local
->sta_lock
, flags
);
344 /* check if STA exists already */
345 if (sta_info_get(local
, sta
->sta
.addr
)) {
346 spin_unlock_irqrestore(&local
->sta_lock
, flags
);
350 list_add(&sta
->list
, &local
->sta_list
);
352 sta_info_hash_add(local
, sta
);
355 if (local
->ops
->sta_notify
) {
356 if (sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
357 sdata
= container_of(sdata
->bss
,
358 struct ieee80211_sub_if_data
,
361 local
->ops
->sta_notify(local_to_hw(local
), &sdata
->vif
,
362 STA_NOTIFY_ADD
, &sta
->sta
);
365 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
366 printk(KERN_DEBUG
"%s: Inserted STA %pM\n",
367 wiphy_name(local
->hw
.wiphy
), sta
->sta
.addr
);
368 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
370 spin_unlock_irqrestore(&local
->sta_lock
, flags
);
372 #ifdef CONFIG_MAC80211_DEBUGFS
374 * Debugfs entry adding might sleep, so schedule process
375 * context task for adding entry for STAs that do not yet
377 * NOTE: due to auto-freeing semantics this may only be done
378 * if the insertion is successful!
380 schedule_work(&local
->sta_debugfs_add
);
383 if (ieee80211_vif_is_mesh(&sdata
->vif
))
384 mesh_accept_plinks_update(sdata
);
389 __sta_info_free(local
, sta
);
393 static inline void __bss_tim_set(struct ieee80211_if_ap
*bss
, u16 aid
)
396 * This format has been mandated by the IEEE specifications,
397 * so this line may not be changed to use the __set_bit() format.
399 bss
->tim
[aid
/ 8] |= (1 << (aid
% 8));
402 static inline void __bss_tim_clear(struct ieee80211_if_ap
*bss
, u16 aid
)
405 * This format has been mandated by the IEEE specifications,
406 * so this line may not be changed to use the __clear_bit() format.
408 bss
->tim
[aid
/ 8] &= ~(1 << (aid
% 8));
411 static void __sta_info_set_tim_bit(struct ieee80211_if_ap
*bss
,
412 struct sta_info
*sta
)
416 __bss_tim_set(bss
, sta
->sta
.aid
);
418 if (sta
->local
->ops
->set_tim
) {
419 sta
->local
->tim_in_locked_section
= true;
420 sta
->local
->ops
->set_tim(local_to_hw(sta
->local
),
422 sta
->local
->tim_in_locked_section
= false;
426 void sta_info_set_tim_bit(struct sta_info
*sta
)
430 BUG_ON(!sta
->sdata
->bss
);
432 spin_lock_irqsave(&sta
->local
->sta_lock
, flags
);
433 __sta_info_set_tim_bit(sta
->sdata
->bss
, sta
);
434 spin_unlock_irqrestore(&sta
->local
->sta_lock
, flags
);
437 static void __sta_info_clear_tim_bit(struct ieee80211_if_ap
*bss
,
438 struct sta_info
*sta
)
442 __bss_tim_clear(bss
, sta
->sta
.aid
);
444 if (sta
->local
->ops
->set_tim
) {
445 sta
->local
->tim_in_locked_section
= true;
446 sta
->local
->ops
->set_tim(local_to_hw(sta
->local
),
448 sta
->local
->tim_in_locked_section
= false;
452 void sta_info_clear_tim_bit(struct sta_info
*sta
)
456 BUG_ON(!sta
->sdata
->bss
);
458 spin_lock_irqsave(&sta
->local
->sta_lock
, flags
);
459 __sta_info_clear_tim_bit(sta
->sdata
->bss
, sta
);
460 spin_unlock_irqrestore(&sta
->local
->sta_lock
, flags
);
463 static void __sta_info_unlink(struct sta_info
**sta
)
465 struct ieee80211_local
*local
= (*sta
)->local
;
466 struct ieee80211_sub_if_data
*sdata
= (*sta
)->sdata
;
468 * pull caller's reference if we're already gone.
470 if (sta_info_hash_del(local
, *sta
)) {
476 ieee80211_key_free((*sta
)->key
);
477 WARN_ON((*sta
)->key
);
480 list_del(&(*sta
)->list
);
482 if (test_and_clear_sta_flags(*sta
, WLAN_STA_PS
)) {
485 atomic_dec(&sdata
->bss
->num_sta_ps
);
486 __sta_info_clear_tim_bit(sdata
->bss
, *sta
);
491 if (local
->ops
->sta_notify
) {
492 if (sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
493 sdata
= container_of(sdata
->bss
,
494 struct ieee80211_sub_if_data
,
497 local
->ops
->sta_notify(local_to_hw(local
), &sdata
->vif
,
498 STA_NOTIFY_REMOVE
, &(*sta
)->sta
);
501 if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
502 mesh_accept_plinks_update(sdata
);
503 #ifdef CONFIG_MAC80211_MESH
504 del_timer(&(*sta
)->plink_timer
);
508 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
509 printk(KERN_DEBUG
"%s: Removed STA %pM\n",
510 wiphy_name(local
->hw
.wiphy
), (*sta
)->sta
.addr
);
511 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
514 * Finally, pull caller's reference if the STA is pinned by the
515 * task that is adding the debugfs entries. In that case, we
516 * leave the STA "to be freed".
518 * The rules are not trivial, but not too complex either:
519 * (1) pin_status is only modified under the sta_lock
520 * (2) STAs may only be pinned under the RTNL so that
521 * sta_info_flush() is guaranteed to actually destroy
522 * all STAs that are active for a given interface, this
523 * is required for correctness because otherwise we
524 * could notify a driver that an interface is going
525 * away and only after that (!) notify it about a STA
526 * on that interface going away.
527 * (3) sta_info_debugfs_add_work() will set the status
528 * to PINNED when it found an item that needs a new
529 * debugfs directory created. In that case, that item
530 * must not be freed although all *RCU* users are done
531 * with it. Hence, we tell the caller of _unlink()
532 * that the item is already gone (as can happen when
533 * two tasks try to unlink/destroy at the same time)
534 * (4) We set the pin_status to DESTROY here when we
536 * (5) sta_info_debugfs_add_work() will reset the pin_status
537 * from PINNED to NORMAL when it is done with the item,
538 * but will check for DESTROY before resetting it in
539 * which case it will free the item.
541 if ((*sta
)->pin_status
== STA_INFO_PIN_STAT_PINNED
) {
542 (*sta
)->pin_status
= STA_INFO_PIN_STAT_DESTROY
;
548 void sta_info_unlink(struct sta_info
**sta
)
550 struct ieee80211_local
*local
= (*sta
)->local
;
553 spin_lock_irqsave(&local
->sta_lock
, flags
);
554 __sta_info_unlink(sta
);
555 spin_unlock_irqrestore(&local
->sta_lock
, flags
);
558 static inline int sta_info_buffer_expired(struct ieee80211_local
*local
,
559 struct sta_info
*sta
,
562 struct ieee80211_tx_info
*info
;
568 info
= IEEE80211_SKB_CB(skb
);
570 /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
571 timeout
= (sta
->listen_interval
* local
->hw
.conf
.beacon_int
* 32 /
573 if (timeout
< STA_TX_BUFFER_EXPIRE
)
574 timeout
= STA_TX_BUFFER_EXPIRE
;
575 return time_after(jiffies
, info
->control
.jiffies
+ timeout
);
579 static void sta_info_cleanup_expire_buffered(struct ieee80211_local
*local
,
580 struct sta_info
*sta
)
584 struct ieee80211_sub_if_data
*sdata
;
586 if (skb_queue_empty(&sta
->ps_tx_buf
))
590 spin_lock_irqsave(&sta
->ps_tx_buf
.lock
, flags
);
591 skb
= skb_peek(&sta
->ps_tx_buf
);
592 if (sta_info_buffer_expired(local
, sta
, skb
))
593 skb
= __skb_dequeue(&sta
->ps_tx_buf
);
596 spin_unlock_irqrestore(&sta
->ps_tx_buf
.lock
, flags
);
602 local
->total_ps_buffered
--;
603 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
604 printk(KERN_DEBUG
"Buffered frame expired (STA %pM)\n",
609 if (skb_queue_empty(&sta
->ps_tx_buf
))
610 sta_info_clear_tim_bit(sta
);
615 static void sta_info_cleanup(unsigned long data
)
617 struct ieee80211_local
*local
= (struct ieee80211_local
*) data
;
618 struct sta_info
*sta
;
621 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
)
622 sta_info_cleanup_expire_buffered(local
, sta
);
625 local
->sta_cleanup
.expires
=
626 round_jiffies(jiffies
+ STA_INFO_CLEANUP_INTERVAL
);
627 add_timer(&local
->sta_cleanup
);
630 #ifdef CONFIG_MAC80211_DEBUGFS
632 * See comment in __sta_info_unlink,
633 * caller must hold local->sta_lock.
635 static void __sta_info_pin(struct sta_info
*sta
)
637 WARN_ON(sta
->pin_status
!= STA_INFO_PIN_STAT_NORMAL
);
638 sta
->pin_status
= STA_INFO_PIN_STAT_PINNED
;
642 * See comment in __sta_info_unlink, returns sta if it
643 * needs to be destroyed.
645 static struct sta_info
*__sta_info_unpin(struct sta_info
*sta
)
647 struct sta_info
*ret
= NULL
;
650 spin_lock_irqsave(&sta
->local
->sta_lock
, flags
);
651 WARN_ON(sta
->pin_status
!= STA_INFO_PIN_STAT_DESTROY
&&
652 sta
->pin_status
!= STA_INFO_PIN_STAT_PINNED
);
653 if (sta
->pin_status
== STA_INFO_PIN_STAT_DESTROY
)
655 sta
->pin_status
= STA_INFO_PIN_STAT_NORMAL
;
656 spin_unlock_irqrestore(&sta
->local
->sta_lock
, flags
);
661 static void sta_info_debugfs_add_work(struct work_struct
*work
)
663 struct ieee80211_local
*local
=
664 container_of(work
, struct ieee80211_local
, sta_debugfs_add
);
665 struct sta_info
*sta
, *tmp
;
668 /* We need to keep the RTNL across the whole pinned status. */
673 spin_lock_irqsave(&local
->sta_lock
, flags
);
674 list_for_each_entry(tmp
, &local
->sta_list
, list
) {
676 * debugfs.add_has_run will be set by
677 * ieee80211_sta_debugfs_add regardless
678 * of what else it does.
680 if (!tmp
->debugfs
.add_has_run
) {
686 spin_unlock_irqrestore(&local
->sta_lock
, flags
);
691 ieee80211_sta_debugfs_add(sta
);
692 rate_control_add_sta_debugfs(sta
);
694 sta
= __sta_info_unpin(sta
);
695 sta_info_destroy(sta
);
701 static void __ieee80211_run_pending_flush(struct ieee80211_local
*local
)
703 struct sta_info
*sta
;
708 spin_lock_irqsave(&local
->sta_lock
, flags
);
709 while (!list_empty(&local
->sta_flush_list
)) {
710 sta
= list_first_entry(&local
->sta_flush_list
,
711 struct sta_info
, list
);
712 list_del(&sta
->list
);
713 spin_unlock_irqrestore(&local
->sta_lock
, flags
);
714 sta_info_destroy(sta
);
715 spin_lock_irqsave(&local
->sta_lock
, flags
);
717 spin_unlock_irqrestore(&local
->sta_lock
, flags
);
720 static void ieee80211_sta_flush_work(struct work_struct
*work
)
722 struct ieee80211_local
*local
=
723 container_of(work
, struct ieee80211_local
, sta_flush_work
);
726 __ieee80211_run_pending_flush(local
);
730 void sta_info_init(struct ieee80211_local
*local
)
732 spin_lock_init(&local
->sta_lock
);
733 INIT_LIST_HEAD(&local
->sta_list
);
734 INIT_LIST_HEAD(&local
->sta_flush_list
);
735 INIT_WORK(&local
->sta_flush_work
, ieee80211_sta_flush_work
);
737 setup_timer(&local
->sta_cleanup
, sta_info_cleanup
,
738 (unsigned long)local
);
739 local
->sta_cleanup
.expires
=
740 round_jiffies(jiffies
+ STA_INFO_CLEANUP_INTERVAL
);
742 #ifdef CONFIG_MAC80211_DEBUGFS
743 INIT_WORK(&local
->sta_debugfs_add
, sta_info_debugfs_add_work
);
747 int sta_info_start(struct ieee80211_local
*local
)
749 add_timer(&local
->sta_cleanup
);
753 void sta_info_stop(struct ieee80211_local
*local
)
755 del_timer(&local
->sta_cleanup
);
756 cancel_work_sync(&local
->sta_flush_work
);
757 #ifdef CONFIG_MAC80211_DEBUGFS
759 * Make sure the debugfs adding work isn't pending after this
760 * because we're about to be destroyed. It doesn't matter
761 * whether it ran or not since we're going to flush all STAs
764 cancel_work_sync(&local
->sta_debugfs_add
);
768 sta_info_flush(local
, NULL
);
769 __ieee80211_run_pending_flush(local
);
774 * sta_info_flush - flush matching STA entries from the STA table
776 * Returns the number of removed STA entries.
778 * @local: local interface data
779 * @sdata: matching rule for the net device (sta->dev) or %NULL to match all STAs
781 int sta_info_flush(struct ieee80211_local
*local
,
782 struct ieee80211_sub_if_data
*sdata
)
784 struct sta_info
*sta
, *tmp
;
792 spin_lock_irqsave(&local
->sta_lock
, flags
);
793 list_for_each_entry_safe(sta
, tmp
, &local
->sta_list
, list
) {
794 if (!sdata
|| sdata
== sta
->sdata
) {
795 __sta_info_unlink(&sta
);
797 list_add_tail(&sta
->list
, &tmp_list
);
802 spin_unlock_irqrestore(&local
->sta_lock
, flags
);
804 list_for_each_entry_safe(sta
, tmp
, &tmp_list
, list
)
805 sta_info_destroy(sta
);
811 * sta_info_flush_delayed - flush matching STA entries from the STA table
813 * This function unlinks all stations for a given interface and queues
814 * them for freeing. Note that the workqueue function scheduled here has
815 * to run before any new keys can be added to the system to avoid set_key()
816 * callback ordering issues.
818 * @sdata: the interface
820 void sta_info_flush_delayed(struct ieee80211_sub_if_data
*sdata
)
822 struct ieee80211_local
*local
= sdata
->local
;
823 struct sta_info
*sta
, *tmp
;
827 spin_lock_irqsave(&local
->sta_lock
, flags
);
828 list_for_each_entry_safe(sta
, tmp
, &local
->sta_list
, list
) {
829 if (sdata
== sta
->sdata
) {
830 __sta_info_unlink(&sta
);
832 list_add_tail(&sta
->list
,
833 &local
->sta_flush_list
);
839 schedule_work(&local
->sta_flush_work
);
840 spin_unlock_irqrestore(&local
->sta_lock
, flags
);
843 void ieee80211_sta_expire(struct ieee80211_sub_if_data
*sdata
,
844 unsigned long exp_time
)
846 struct ieee80211_local
*local
= sdata
->local
;
847 struct sta_info
*sta
, *tmp
;
851 spin_lock_irqsave(&local
->sta_lock
, flags
);
852 list_for_each_entry_safe(sta
, tmp
, &local
->sta_list
, list
)
853 if (time_after(jiffies
, sta
->last_rx
+ exp_time
)) {
854 #ifdef CONFIG_MAC80211_IBSS_DEBUG
855 printk(KERN_DEBUG
"%s: expiring inactive STA %pM\n",
856 sdata
->dev
->name
, sta
->sta
.addr
);
858 __sta_info_unlink(&sta
);
860 list_add(&sta
->list
, &tmp_list
);
862 spin_unlock_irqrestore(&local
->sta_lock
, flags
);
864 list_for_each_entry_safe(sta
, tmp
, &tmp_list
, list
)
865 sta_info_destroy(sta
);
868 struct ieee80211_sta
*ieee80211_find_sta(struct ieee80211_hw
*hw
,
871 struct sta_info
*sta
= sta_info_get(hw_to_local(hw
), addr
);
877 EXPORT_SYMBOL(ieee80211_find_sta
);