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"
22 #include "driver-ops.h"
25 #include "debugfs_sta.h"
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
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 association 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 immediately 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,
70 s = rcu_dereference_protected(local->sta_hash[STA_HASH(sta->sta.addr)],
71 lockdep_is_held(&local->sta_lock));
75 rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)],
80 while (rcu_access_pointer(s->hnext) &&
81 rcu_access_pointer(s->hnext) != sta)
82 s = rcu_dereference_protected(s->hnext,
83 lockdep_is_held(&local->sta_lock));
84 if (rcu_access_pointer(s->hnext)) {
85 rcu_assign_pointer(s->hnext, sta->hnext);
92 /* protected by RCU */
93 struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata,
96 struct ieee80211_local *local = sdata->local;
99 sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)],
100 lockdep_is_held(&local->sta_lock) ||
101 lockdep_is_held(&local->sta_mtx));
103 if (sta->sdata == sdata &&
104 memcmp(sta->sta.addr, addr, ETH_ALEN) == 0)
106 sta = rcu_dereference_check(sta->hnext,
107 lockdep_is_held(&local->sta_lock) ||
108 lockdep_is_held(&local->sta_mtx));
114 * Get sta info either from the specified interface
115 * or from one of its vlans
117 struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata,
120 struct ieee80211_local *local = sdata->local;
121 struct sta_info *sta;
123 sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)],
124 lockdep_is_held(&local->sta_lock) ||
125 lockdep_is_held(&local->sta_mtx));
127 if ((sta->sdata == sdata ||
128 (sta->sdata->bss && sta->sdata->bss == sdata->bss)) &&
129 memcmp(sta->sta.addr, addr, ETH_ALEN) == 0)
131 sta = rcu_dereference_check(sta->hnext,
132 lockdep_is_held(&local->sta_lock) ||
133 lockdep_is_held(&local->sta_mtx));
138 struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
141 struct ieee80211_local *local = sdata->local;
142 struct sta_info *sta;
145 list_for_each_entry_rcu(sta, &local->sta_list, list) {
146 if (sdata != sta->sdata)
159 * __sta_info_free - internal STA free helper
161 * @local: pointer to the global information
162 * @sta: STA info to free
164 * This function must undo everything done by sta_info_alloc()
165 * that may happen before sta_info_insert().
167 static void __sta_info_free(struct ieee80211_local *local,
168 struct sta_info *sta)
170 if (sta->rate_ctrl) {
171 rate_control_free_sta(sta);
172 rate_control_put(sta->rate_ctrl);
175 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
176 wiphy_debug(local->hw.wiphy, "Destroyed STA %pM\n", sta->sta.addr);
177 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
182 /* Caller must hold local->sta_lock */
183 static void sta_info_hash_add(struct ieee80211_local *local,
184 struct sta_info *sta)
186 sta->hnext = local->sta_hash[STA_HASH(sta->sta.addr)];
187 rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)], sta);
190 static void sta_unblock(struct work_struct *wk)
192 struct sta_info *sta;
194 sta = container_of(wk, struct sta_info, drv_unblock_wk);
199 if (!test_sta_flags(sta, WLAN_STA_PS_STA))
200 ieee80211_sta_ps_deliver_wakeup(sta);
201 else if (test_and_clear_sta_flags(sta, WLAN_STA_PSPOLL)) {
202 clear_sta_flags(sta, WLAN_STA_PS_DRIVER);
203 ieee80211_sta_ps_deliver_poll_response(sta);
205 clear_sta_flags(sta, WLAN_STA_PS_DRIVER);
208 static int sta_prepare_rate_control(struct ieee80211_local *local,
209 struct sta_info *sta, gfp_t gfp)
211 if (local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)
214 sta->rate_ctrl = rate_control_get(local->rate_ctrl);
215 sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl,
217 if (!sta->rate_ctrl_priv) {
218 rate_control_put(sta->rate_ctrl);
225 struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
228 struct ieee80211_local *local = sdata->local;
229 struct sta_info *sta;
230 struct timespec uptime;
233 sta = kzalloc(sizeof(*sta) + local->hw.sta_data_size, gfp);
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);
246 sta->last_rx = jiffies;
248 do_posix_clock_monotonic_gettime(&uptime);
249 sta->last_connected = uptime.tv_sec;
250 ewma_init(&sta->avg_signal, 1024, 8);
252 if (sta_prepare_rate_control(local, sta, gfp)) {
257 for (i = 0; i < STA_TID_NUM; i++) {
259 * timer_to_tid must be initialized with identity mapping
260 * to enable session_timer's data differentiation. See
261 * sta_rx_agg_session_timer_expired for usage.
263 sta->timer_to_tid[i] = i;
265 skb_queue_head_init(&sta->ps_tx_buf);
266 skb_queue_head_init(&sta->tx_filtered);
268 for (i = 0; i < NUM_RX_DATA_QUEUES; i++)
269 sta->last_seq_ctrl[i] = cpu_to_le16(USHRT_MAX);
271 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
272 wiphy_debug(local->hw.wiphy, "Allocated STA %pM\n", sta->sta.addr);
273 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
275 #ifdef CONFIG_MAC80211_MESH
276 sta->plink_state = NL80211_PLINK_LISTEN;
277 init_timer(&sta->plink_timer);
283 static int sta_info_finish_insert(struct sta_info *sta, bool async)
285 struct ieee80211_local *local = sta->local;
286 struct ieee80211_sub_if_data *sdata = sta->sdata;
287 struct station_info sinfo;
291 lockdep_assert_held(&local->sta_mtx);
294 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
295 sdata = container_of(sdata->bss,
296 struct ieee80211_sub_if_data,
298 err = drv_sta_add(local, sdata, &sta->sta);
302 printk(KERN_DEBUG "%s: failed to add IBSS STA %pM to driver (%d)"
303 " - keeping it anyway.\n",
304 sdata->name, sta->sta.addr, err);
306 sta->uploaded = true;
307 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
309 wiphy_debug(local->hw.wiphy,
310 "Finished adding IBSS STA %pM\n",
319 local->sta_generation++;
322 /* make the station visible */
323 spin_lock_irqsave(&local->sta_lock, flags);
324 sta_info_hash_add(local, sta);
325 spin_unlock_irqrestore(&local->sta_lock, flags);
328 list_add(&sta->list, &local->sta_list);
330 ieee80211_sta_debugfs_add(sta);
331 rate_control_add_sta_debugfs(sta);
333 memset(&sinfo, 0, sizeof(sinfo));
335 sinfo.generation = local->sta_generation;
336 cfg80211_new_sta(sdata->dev, sta->sta.addr, &sinfo, GFP_KERNEL);
342 static void sta_info_finish_pending(struct ieee80211_local *local)
344 struct sta_info *sta;
347 spin_lock_irqsave(&local->sta_lock, flags);
348 while (!list_empty(&local->sta_pending_list)) {
349 sta = list_first_entry(&local->sta_pending_list,
350 struct sta_info, list);
351 list_del(&sta->list);
352 spin_unlock_irqrestore(&local->sta_lock, flags);
354 sta_info_finish_insert(sta, true);
356 spin_lock_irqsave(&local->sta_lock, flags);
358 spin_unlock_irqrestore(&local->sta_lock, flags);
361 static void sta_info_finish_work(struct work_struct *work)
363 struct ieee80211_local *local =
364 container_of(work, struct ieee80211_local, sta_finish_work);
366 mutex_lock(&local->sta_mtx);
367 sta_info_finish_pending(local);
368 mutex_unlock(&local->sta_mtx);
371 static int sta_info_insert_check(struct sta_info *sta)
373 struct ieee80211_sub_if_data *sdata = sta->sdata;
376 * Can't be a WARN_ON because it can be triggered through a race:
377 * something inserts a STA (on one CPU) without holding the RTNL
378 * and another CPU turns off the net device.
380 if (unlikely(!ieee80211_sdata_running(sdata)))
383 if (WARN_ON(compare_ether_addr(sta->sta.addr, sdata->vif.addr) == 0 ||
384 is_multicast_ether_addr(sta->sta.addr)))
390 static int sta_info_insert_ibss(struct sta_info *sta) __acquires(RCU)
392 struct ieee80211_local *local = sta->local;
393 struct ieee80211_sub_if_data *sdata = sta->sdata;
396 spin_lock_irqsave(&local->sta_lock, flags);
397 /* check if STA exists already */
398 if (sta_info_get_bss(sdata, sta->sta.addr)) {
399 spin_unlock_irqrestore(&local->sta_lock, flags);
405 local->sta_generation++;
407 sta_info_hash_add(local, sta);
409 list_add_tail(&sta->list, &local->sta_pending_list);
412 spin_unlock_irqrestore(&local->sta_lock, flags);
414 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
415 wiphy_debug(local->hw.wiphy, "Added IBSS STA %pM\n",
417 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
419 ieee80211_queue_work(&local->hw, &local->sta_finish_work);
425 * should be called with sta_mtx locked
426 * this function replaces the mutex lock
429 static int sta_info_insert_non_ibss(struct sta_info *sta) __acquires(RCU)
431 struct ieee80211_local *local = sta->local;
432 struct ieee80211_sub_if_data *sdata = sta->sdata;
436 lockdep_assert_held(&local->sta_mtx);
439 * On first glance, this will look racy, because the code
440 * in this function, which inserts a station with sleeping,
441 * unlocks the sta_lock between checking existence in the
442 * hash table and inserting into it.
444 * However, it is not racy against itself because it keeps
448 spin_lock_irqsave(&local->sta_lock, flags);
449 /* check if STA exists already */
450 if (sta_info_get_bss(sdata, sta->sta.addr)) {
451 spin_unlock_irqrestore(&local->sta_lock, flags);
452 mutex_unlock(&local->sta_mtx);
457 spin_unlock_irqrestore(&local->sta_lock, flags);
459 err = sta_info_finish_insert(sta, false);
461 mutex_unlock(&local->sta_mtx);
466 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
467 wiphy_debug(local->hw.wiphy, "Inserted STA %pM\n", sta->sta.addr);
468 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
470 /* move reference to rcu-protected */
472 mutex_unlock(&local->sta_mtx);
474 if (ieee80211_vif_is_mesh(&sdata->vif))
475 mesh_accept_plinks_update(sdata);
480 int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU)
482 struct ieee80211_local *local = sta->local;
483 struct ieee80211_sub_if_data *sdata = sta->sdata;
486 err = sta_info_insert_check(sta);
493 * In ad-hoc mode, we sometimes need to insert stations
494 * from tasklet context from the RX path. To avoid races,
495 * always do so in that case -- see the comment below.
497 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
498 err = sta_info_insert_ibss(sta);
506 * It might seem that the function called below is in race against
507 * the function call above that atomically inserts the station... That,
508 * however, is not true because the above code can only
509 * be invoked for IBSS interfaces, and the below code will
510 * not be -- and the two do not race against each other as
511 * the hash table also keys off the interface.
516 mutex_lock(&local->sta_mtx);
518 err = sta_info_insert_non_ibss(sta);
525 __sta_info_free(local, sta);
529 int sta_info_insert(struct sta_info *sta)
531 int err = sta_info_insert_rcu(sta);
538 static inline void __bss_tim_set(struct ieee80211_if_ap *bss, u16 aid)
541 * This format has been mandated by the IEEE specifications,
542 * so this line may not be changed to use the __set_bit() format.
544 bss->tim[aid / 8] |= (1 << (aid % 8));
547 static inline void __bss_tim_clear(struct ieee80211_if_ap *bss, u16 aid)
550 * This format has been mandated by the IEEE specifications,
551 * so this line may not be changed to use the __clear_bit() format.
553 bss->tim[aid / 8] &= ~(1 << (aid % 8));
556 static void __sta_info_set_tim_bit(struct ieee80211_if_ap *bss,
557 struct sta_info *sta)
561 __bss_tim_set(bss, sta->sta.aid);
563 if (sta->local->ops->set_tim) {
564 sta->local->tim_in_locked_section = true;
565 drv_set_tim(sta->local, &sta->sta, true);
566 sta->local->tim_in_locked_section = false;
570 void sta_info_set_tim_bit(struct sta_info *sta)
574 BUG_ON(!sta->sdata->bss);
576 spin_lock_irqsave(&sta->local->sta_lock, flags);
577 __sta_info_set_tim_bit(sta->sdata->bss, sta);
578 spin_unlock_irqrestore(&sta->local->sta_lock, flags);
581 static void __sta_info_clear_tim_bit(struct ieee80211_if_ap *bss,
582 struct sta_info *sta)
586 __bss_tim_clear(bss, sta->sta.aid);
588 if (sta->local->ops->set_tim) {
589 sta->local->tim_in_locked_section = true;
590 drv_set_tim(sta->local, &sta->sta, false);
591 sta->local->tim_in_locked_section = false;
595 void sta_info_clear_tim_bit(struct sta_info *sta)
599 BUG_ON(!sta->sdata->bss);
601 spin_lock_irqsave(&sta->local->sta_lock, flags);
602 __sta_info_clear_tim_bit(sta->sdata->bss, sta);
603 spin_unlock_irqrestore(&sta->local->sta_lock, flags);
606 static int sta_info_buffer_expired(struct sta_info *sta,
609 struct ieee80211_tx_info *info;
615 info = IEEE80211_SKB_CB(skb);
617 /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
618 timeout = (sta->listen_interval *
619 sta->sdata->vif.bss_conf.beacon_int *
621 if (timeout < STA_TX_BUFFER_EXPIRE)
622 timeout = STA_TX_BUFFER_EXPIRE;
623 return time_after(jiffies, info->control.jiffies + timeout);
627 static bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
628 struct sta_info *sta)
633 if (skb_queue_empty(&sta->ps_tx_buf))
637 spin_lock_irqsave(&sta->ps_tx_buf.lock, flags);
638 skb = skb_peek(&sta->ps_tx_buf);
639 if (sta_info_buffer_expired(sta, skb))
640 skb = __skb_dequeue(&sta->ps_tx_buf);
643 spin_unlock_irqrestore(&sta->ps_tx_buf.lock, flags);
648 local->total_ps_buffered--;
649 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
650 printk(KERN_DEBUG "Buffered frame expired (STA %pM)\n",
655 if (skb_queue_empty(&sta->ps_tx_buf) &&
656 !test_sta_flags(sta, WLAN_STA_PS_DRIVER_BUF))
657 sta_info_clear_tim_bit(sta);
663 static int __must_check __sta_info_destroy(struct sta_info *sta)
665 struct ieee80211_local *local;
666 struct ieee80211_sub_if_data *sdata;
680 * Before removing the station from the driver and
681 * rate control, it might still start new aggregation
682 * sessions -- block that to make sure the tear-down
683 * will be sufficient.
685 set_sta_flags(sta, WLAN_STA_BLOCK_BA);
686 ieee80211_sta_tear_down_BA_sessions(sta, true);
688 spin_lock_irqsave(&local->sta_lock, flags);
689 ret = sta_info_hash_del(local, sta);
690 /* this might still be the pending list ... which is fine */
692 list_del(&sta->list);
693 spin_unlock_irqrestore(&local->sta_lock, flags);
697 mutex_lock(&local->key_mtx);
698 for (i = 0; i < NUM_DEFAULT_KEYS; i++)
699 __ieee80211_key_free(key_mtx_dereference(local, sta->gtk[i]));
701 __ieee80211_key_free(key_mtx_dereference(local, sta->ptk));
702 mutex_unlock(&local->key_mtx);
706 if (test_and_clear_sta_flags(sta,
707 WLAN_STA_PS_STA | WLAN_STA_PS_DRIVER)) {
710 atomic_dec(&sdata->bss->num_sta_ps);
711 __sta_info_clear_tim_bit(sdata->bss, sta);
715 local->sta_generation++;
717 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
718 rcu_assign_pointer(sdata->u.vlan.sta, NULL);
721 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
722 sdata = container_of(sdata->bss,
723 struct ieee80211_sub_if_data,
725 drv_sta_remove(local, sdata, &sta->sta);
730 * At this point, after we wait for an RCU grace period,
731 * neither mac80211 nor the driver can reference this
732 * sta struct any more except by still existing timers
733 * associated with this station that we clean up below.
737 #ifdef CONFIG_MAC80211_MESH
738 if (ieee80211_vif_is_mesh(&sdata->vif))
739 mesh_accept_plinks_update(sdata);
742 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
743 wiphy_debug(local->hw.wiphy, "Removed STA %pM\n", sta->sta.addr);
744 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
745 cancel_work_sync(&sta->drv_unblock_wk);
747 cfg80211_del_sta(sdata->dev, sta->sta.addr, GFP_KERNEL);
749 rate_control_remove_sta_debugfs(sta);
750 ieee80211_sta_debugfs_remove(sta);
752 #ifdef CONFIG_MAC80211_MESH
753 if (ieee80211_vif_is_mesh(&sta->sdata->vif)) {
754 mesh_plink_deactivate(sta);
755 del_timer_sync(&sta->plink_timer);
759 while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
760 local->total_ps_buffered--;
761 dev_kfree_skb_any(skb);
764 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL)
765 dev_kfree_skb_any(skb);
767 __sta_info_free(local, sta);
772 int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, const u8 *addr)
774 struct sta_info *sta;
777 mutex_lock(&sdata->local->sta_mtx);
778 sta = sta_info_get(sdata, addr);
779 ret = __sta_info_destroy(sta);
780 mutex_unlock(&sdata->local->sta_mtx);
785 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
788 struct sta_info *sta;
791 mutex_lock(&sdata->local->sta_mtx);
792 sta = sta_info_get_bss(sdata, addr);
793 ret = __sta_info_destroy(sta);
794 mutex_unlock(&sdata->local->sta_mtx);
799 static void sta_info_cleanup(unsigned long data)
801 struct ieee80211_local *local = (struct ieee80211_local *) data;
802 struct sta_info *sta;
803 bool timer_needed = false;
806 list_for_each_entry_rcu(sta, &local->sta_list, list)
807 if (sta_info_cleanup_expire_buffered(local, sta))
811 if (local->quiescing)
817 mod_timer(&local->sta_cleanup,
818 round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL));
821 void sta_info_init(struct ieee80211_local *local)
823 spin_lock_init(&local->sta_lock);
824 mutex_init(&local->sta_mtx);
825 INIT_LIST_HEAD(&local->sta_list);
826 INIT_LIST_HEAD(&local->sta_pending_list);
827 INIT_WORK(&local->sta_finish_work, sta_info_finish_work);
829 setup_timer(&local->sta_cleanup, sta_info_cleanup,
830 (unsigned long)local);
833 void sta_info_stop(struct ieee80211_local *local)
835 del_timer(&local->sta_cleanup);
836 sta_info_flush(local, NULL);
840 * sta_info_flush - flush matching STA entries from the STA table
842 * Returns the number of removed STA entries.
844 * @local: local interface data
845 * @sdata: matching rule for the net device (sta->dev) or %NULL to match all STAs
847 int sta_info_flush(struct ieee80211_local *local,
848 struct ieee80211_sub_if_data *sdata)
850 struct sta_info *sta, *tmp;
855 mutex_lock(&local->sta_mtx);
857 sta_info_finish_pending(local);
859 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
860 if (!sdata || sdata == sta->sdata)
861 WARN_ON(__sta_info_destroy(sta));
863 mutex_unlock(&local->sta_mtx);
868 void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
869 unsigned long exp_time)
871 struct ieee80211_local *local = sdata->local;
872 struct sta_info *sta, *tmp;
874 mutex_lock(&local->sta_mtx);
875 list_for_each_entry_safe(sta, tmp, &local->sta_list, list)
876 if (time_after(jiffies, sta->last_rx + exp_time)) {
877 #ifdef CONFIG_MAC80211_IBSS_DEBUG
878 printk(KERN_DEBUG "%s: expiring inactive STA %pM\n",
879 sdata->name, sta->sta.addr);
881 WARN_ON(__sta_info_destroy(sta));
883 mutex_unlock(&local->sta_mtx);
886 struct ieee80211_sta *ieee80211_find_sta_by_ifaddr(struct ieee80211_hw *hw,
890 struct sta_info *sta, *nxt;
893 * Just return a random station if localaddr is NULL
896 for_each_sta_info(hw_to_local(hw), addr, sta, nxt) {
898 compare_ether_addr(sta->sdata->vif.addr, localaddr) != 0)
907 EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr);
909 struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif,
912 struct sta_info *sta;
917 sta = sta_info_get_bss(vif_to_sdata(vif), addr);
926 EXPORT_SYMBOL(ieee80211_find_sta);
928 static void clear_sta_ps_flags(void *_sta)
930 struct sta_info *sta = _sta;
932 clear_sta_flags(sta, WLAN_STA_PS_DRIVER | WLAN_STA_PS_STA);
935 /* powersave support code */
936 void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta)
938 struct ieee80211_sub_if_data *sdata = sta->sdata;
939 struct ieee80211_local *local = sdata->local;
942 clear_sta_flags(sta, WLAN_STA_PS_DRIVER_BUF);
943 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
944 drv_sta_notify(local, sdata, STA_NOTIFY_AWAKE, &sta->sta);
946 if (!skb_queue_empty(&sta->ps_tx_buf))
947 sta_info_clear_tim_bit(sta);
949 /* Send all buffered frames to the station */
950 sent = ieee80211_add_pending_skbs(local, &sta->tx_filtered);
951 buffered = ieee80211_add_pending_skbs_fn(local, &sta->ps_tx_buf,
952 clear_sta_ps_flags, sta);
954 local->total_ps_buffered -= buffered;
956 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
957 printk(KERN_DEBUG "%s: STA %pM aid %d sending %d filtered/%d PS frames "
958 "since STA not sleeping anymore\n", sdata->name,
959 sta->sta.addr, sta->sta.aid, sent - buffered, buffered);
960 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
963 void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta)
965 struct ieee80211_sub_if_data *sdata = sta->sdata;
966 struct ieee80211_local *local = sdata->local;
970 skb = skb_dequeue(&sta->tx_filtered);
972 skb = skb_dequeue(&sta->ps_tx_buf);
974 local->total_ps_buffered--;
976 no_pending_pkts = skb_queue_empty(&sta->tx_filtered) &&
977 skb_queue_empty(&sta->ps_tx_buf);
980 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
981 struct ieee80211_hdr *hdr =
982 (struct ieee80211_hdr *) skb->data;
985 * Tell TX path to send this frame even though the STA may
986 * still remain is PS mode after this frame exchange.
988 info->flags |= IEEE80211_TX_CTL_PSPOLL_RESPONSE;
990 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
991 printk(KERN_DEBUG "STA %pM aid %d: PS Poll (entries after %d)\n",
992 sta->sta.addr, sta->sta.aid,
993 skb_queue_len(&sta->ps_tx_buf));
994 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
996 /* Use MoreData flag to indicate whether there are more
997 * buffered frames for this STA */
999 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
1001 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1003 ieee80211_add_pending_skb(local, skb);
1005 if (no_pending_pkts)
1006 sta_info_clear_tim_bit(sta);
1007 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1010 * FIXME: This can be the result of a race condition between
1011 * us expiring a frame and the station polling for it.
1012 * Should we send it a null-func frame indicating we
1013 * have nothing buffered for it?
1015 printk(KERN_DEBUG "%s: STA %pM sent PS Poll even "
1016 "though there are no buffered frames for it\n",
1017 sdata->name, sta->sta.addr);
1018 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1022 void ieee80211_sta_block_awake(struct ieee80211_hw *hw,
1023 struct ieee80211_sta *pubsta, bool block)
1025 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1027 trace_api_sta_block_awake(sta->local, pubsta, block);
1030 set_sta_flags(sta, WLAN_STA_PS_DRIVER);
1031 else if (test_sta_flags(sta, WLAN_STA_PS_DRIVER))
1032 ieee80211_queue_work(hw, &sta->drv_unblock_wk);
1034 EXPORT_SYMBOL(ieee80211_sta_block_awake);
1036 void ieee80211_sta_set_tim(struct ieee80211_sta *pubsta)
1038 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1040 set_sta_flags(sta, WLAN_STA_PS_DRIVER_BUF);
1041 sta_info_set_tim_bit(sta);
1043 EXPORT_SYMBOL(ieee80211_sta_set_tim);