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 rcu_read_lock_held() ||
101 lockdep_is_held(&local->sta_lock) ||
102 lockdep_is_held(&local->sta_mtx));
104 if (sta->sdata == sdata &&
105 memcmp(sta->sta.addr, addr, ETH_ALEN) == 0)
107 sta = rcu_dereference_check(sta->hnext,
108 rcu_read_lock_held() ||
109 lockdep_is_held(&local->sta_lock) ||
110 lockdep_is_held(&local->sta_mtx));
116 * Get sta info either from the specified interface
117 * or from one of its vlans
119 struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata,
122 struct ieee80211_local *local = sdata->local;
123 struct sta_info *sta;
125 sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)],
126 rcu_read_lock_held() ||
127 lockdep_is_held(&local->sta_lock) ||
128 lockdep_is_held(&local->sta_mtx));
130 if ((sta->sdata == sdata ||
131 (sta->sdata->bss && sta->sdata->bss == sdata->bss)) &&
132 memcmp(sta->sta.addr, addr, ETH_ALEN) == 0)
134 sta = rcu_dereference_check(sta->hnext,
135 rcu_read_lock_held() ||
136 lockdep_is_held(&local->sta_lock) ||
137 lockdep_is_held(&local->sta_mtx));
142 struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
145 struct ieee80211_local *local = sdata->local;
146 struct sta_info *sta;
149 list_for_each_entry_rcu(sta, &local->sta_list, list) {
150 if (sdata != sta->sdata)
163 * __sta_info_free - internal STA free helper
165 * @local: pointer to the global information
166 * @sta: STA info to free
168 * This function must undo everything done by sta_info_alloc()
169 * that may happen before sta_info_insert().
171 static void __sta_info_free(struct ieee80211_local *local,
172 struct sta_info *sta)
174 if (sta->rate_ctrl) {
175 rate_control_free_sta(sta);
176 rate_control_put(sta->rate_ctrl);
179 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
180 wiphy_debug(local->hw.wiphy, "Destroyed STA %pM\n", sta->sta.addr);
181 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
186 /* Caller must hold local->sta_lock */
187 static void sta_info_hash_add(struct ieee80211_local *local,
188 struct sta_info *sta)
190 sta->hnext = local->sta_hash[STA_HASH(sta->sta.addr)];
191 rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)], sta);
194 static void sta_unblock(struct work_struct *wk)
196 struct sta_info *sta;
198 sta = container_of(wk, struct sta_info, drv_unblock_wk);
203 if (!test_sta_flags(sta, WLAN_STA_PS_STA))
204 ieee80211_sta_ps_deliver_wakeup(sta);
205 else if (test_and_clear_sta_flags(sta, WLAN_STA_PSPOLL)) {
206 clear_sta_flags(sta, WLAN_STA_PS_DRIVER);
207 ieee80211_sta_ps_deliver_poll_response(sta);
209 clear_sta_flags(sta, WLAN_STA_PS_DRIVER);
212 static int sta_prepare_rate_control(struct ieee80211_local *local,
213 struct sta_info *sta, gfp_t gfp)
215 if (local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)
218 sta->rate_ctrl = rate_control_get(local->rate_ctrl);
219 sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl,
221 if (!sta->rate_ctrl_priv) {
222 rate_control_put(sta->rate_ctrl);
229 struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
232 struct ieee80211_local *local = sdata->local;
233 struct sta_info *sta;
234 struct timespec uptime;
237 sta = kzalloc(sizeof(*sta) + local->hw.sta_data_size, gfp);
241 spin_lock_init(&sta->lock);
242 spin_lock_init(&sta->flaglock);
243 INIT_WORK(&sta->drv_unblock_wk, sta_unblock);
244 INIT_WORK(&sta->ampdu_mlme.work, ieee80211_ba_session_work);
245 mutex_init(&sta->ampdu_mlme.mtx);
247 memcpy(sta->sta.addr, addr, ETH_ALEN);
250 sta->last_rx = jiffies;
252 do_posix_clock_monotonic_gettime(&uptime);
253 sta->last_connected = uptime.tv_sec;
254 ewma_init(&sta->avg_signal, 1024, 8);
256 if (sta_prepare_rate_control(local, sta, gfp)) {
261 for (i = 0; i < STA_TID_NUM; i++) {
263 * timer_to_tid must be initialized with identity mapping
264 * to enable session_timer's data differentiation. See
265 * sta_rx_agg_session_timer_expired for usage.
267 sta->timer_to_tid[i] = i;
269 skb_queue_head_init(&sta->ps_tx_buf);
270 skb_queue_head_init(&sta->tx_filtered);
272 for (i = 0; i < NUM_RX_DATA_QUEUES; i++)
273 sta->last_seq_ctrl[i] = cpu_to_le16(USHRT_MAX);
275 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
276 wiphy_debug(local->hw.wiphy, "Allocated STA %pM\n", sta->sta.addr);
277 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
279 #ifdef CONFIG_MAC80211_MESH
280 sta->plink_state = NL80211_PLINK_LISTEN;
281 init_timer(&sta->plink_timer);
287 static int sta_info_finish_insert(struct sta_info *sta, bool async)
289 struct ieee80211_local *local = sta->local;
290 struct ieee80211_sub_if_data *sdata = sta->sdata;
291 struct station_info sinfo;
295 lockdep_assert_held(&local->sta_mtx);
298 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
299 sdata = container_of(sdata->bss,
300 struct ieee80211_sub_if_data,
302 err = drv_sta_add(local, sdata, &sta->sta);
306 printk(KERN_DEBUG "%s: failed to add IBSS STA %pM to driver (%d)"
307 " - keeping it anyway.\n",
308 sdata->name, sta->sta.addr, err);
310 sta->uploaded = true;
311 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
313 wiphy_debug(local->hw.wiphy,
314 "Finished adding IBSS STA %pM\n",
323 local->sta_generation++;
326 /* make the station visible */
327 spin_lock_irqsave(&local->sta_lock, flags);
328 sta_info_hash_add(local, sta);
329 spin_unlock_irqrestore(&local->sta_lock, flags);
332 list_add(&sta->list, &local->sta_list);
334 ieee80211_sta_debugfs_add(sta);
335 rate_control_add_sta_debugfs(sta);
337 memset(&sinfo, 0, sizeof(sinfo));
339 sinfo.generation = local->sta_generation;
340 cfg80211_new_sta(sdata->dev, sta->sta.addr, &sinfo, GFP_KERNEL);
346 static void sta_info_finish_pending(struct ieee80211_local *local)
348 struct sta_info *sta;
351 spin_lock_irqsave(&local->sta_lock, flags);
352 while (!list_empty(&local->sta_pending_list)) {
353 sta = list_first_entry(&local->sta_pending_list,
354 struct sta_info, list);
355 list_del(&sta->list);
356 spin_unlock_irqrestore(&local->sta_lock, flags);
358 sta_info_finish_insert(sta, true);
360 spin_lock_irqsave(&local->sta_lock, flags);
362 spin_unlock_irqrestore(&local->sta_lock, flags);
365 static void sta_info_finish_work(struct work_struct *work)
367 struct ieee80211_local *local =
368 container_of(work, struct ieee80211_local, sta_finish_work);
370 mutex_lock(&local->sta_mtx);
371 sta_info_finish_pending(local);
372 mutex_unlock(&local->sta_mtx);
375 int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU)
377 struct ieee80211_local *local = sta->local;
378 struct ieee80211_sub_if_data *sdata = sta->sdata;
383 * Can't be a WARN_ON because it can be triggered through a race:
384 * something inserts a STA (on one CPU) without holding the RTNL
385 * and another CPU turns off the net device.
387 if (unlikely(!ieee80211_sdata_running(sdata))) {
393 if (WARN_ON(compare_ether_addr(sta->sta.addr, sdata->vif.addr) == 0 ||
394 is_multicast_ether_addr(sta->sta.addr))) {
401 * In ad-hoc mode, we sometimes need to insert stations
402 * from tasklet context from the RX path. To avoid races,
403 * always do so in that case -- see the comment below.
405 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
406 spin_lock_irqsave(&local->sta_lock, flags);
407 /* check if STA exists already */
408 if (sta_info_get_bss(sdata, sta->sta.addr)) {
409 spin_unlock_irqrestore(&local->sta_lock, flags);
416 local->sta_generation++;
418 sta_info_hash_add(local, sta);
420 list_add_tail(&sta->list, &local->sta_pending_list);
423 spin_unlock_irqrestore(&local->sta_lock, flags);
425 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
426 wiphy_debug(local->hw.wiphy, "Added IBSS STA %pM\n",
428 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
430 ieee80211_queue_work(&local->hw, &local->sta_finish_work);
436 * On first glance, this will look racy, because the code
437 * below this point, which inserts a station with sleeping,
438 * unlocks the sta_lock between checking existence in the
439 * hash table and inserting into it.
441 * However, it is not racy against itself because it keeps
442 * the mutex locked. It still seems to race against the
443 * above code that atomically inserts the station... That,
444 * however, is not true because the above code can only
445 * be invoked for IBSS interfaces, and the below code will
446 * not be -- and the two do not race against each other as
447 * the hash table also keys off the interface.
452 mutex_lock(&local->sta_mtx);
454 spin_lock_irqsave(&local->sta_lock, flags);
455 /* check if STA exists already */
456 if (sta_info_get_bss(sdata, sta->sta.addr)) {
457 spin_unlock_irqrestore(&local->sta_lock, flags);
458 mutex_unlock(&local->sta_mtx);
464 spin_unlock_irqrestore(&local->sta_lock, flags);
466 err = sta_info_finish_insert(sta, false);
468 mutex_unlock(&local->sta_mtx);
473 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
474 wiphy_debug(local->hw.wiphy, "Inserted STA %pM\n", sta->sta.addr);
475 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
477 /* move reference to rcu-protected */
479 mutex_unlock(&local->sta_mtx);
481 if (ieee80211_vif_is_mesh(&sdata->vif))
482 mesh_accept_plinks_update(sdata);
487 __sta_info_free(local, sta);
491 int sta_info_insert(struct sta_info *sta)
493 int err = sta_info_insert_rcu(sta);
500 static inline void __bss_tim_set(struct ieee80211_if_ap *bss, u16 aid)
503 * This format has been mandated by the IEEE specifications,
504 * so this line may not be changed to use the __set_bit() format.
506 bss->tim[aid / 8] |= (1 << (aid % 8));
509 static inline void __bss_tim_clear(struct ieee80211_if_ap *bss, u16 aid)
512 * This format has been mandated by the IEEE specifications,
513 * so this line may not be changed to use the __clear_bit() format.
515 bss->tim[aid / 8] &= ~(1 << (aid % 8));
518 static void __sta_info_set_tim_bit(struct ieee80211_if_ap *bss,
519 struct sta_info *sta)
523 __bss_tim_set(bss, sta->sta.aid);
525 if (sta->local->ops->set_tim) {
526 sta->local->tim_in_locked_section = true;
527 drv_set_tim(sta->local, &sta->sta, true);
528 sta->local->tim_in_locked_section = false;
532 void sta_info_set_tim_bit(struct sta_info *sta)
536 BUG_ON(!sta->sdata->bss);
538 spin_lock_irqsave(&sta->local->sta_lock, flags);
539 __sta_info_set_tim_bit(sta->sdata->bss, sta);
540 spin_unlock_irqrestore(&sta->local->sta_lock, flags);
543 static void __sta_info_clear_tim_bit(struct ieee80211_if_ap *bss,
544 struct sta_info *sta)
548 __bss_tim_clear(bss, sta->sta.aid);
550 if (sta->local->ops->set_tim) {
551 sta->local->tim_in_locked_section = true;
552 drv_set_tim(sta->local, &sta->sta, false);
553 sta->local->tim_in_locked_section = false;
557 void sta_info_clear_tim_bit(struct sta_info *sta)
561 BUG_ON(!sta->sdata->bss);
563 spin_lock_irqsave(&sta->local->sta_lock, flags);
564 __sta_info_clear_tim_bit(sta->sdata->bss, sta);
565 spin_unlock_irqrestore(&sta->local->sta_lock, flags);
568 static int sta_info_buffer_expired(struct sta_info *sta,
571 struct ieee80211_tx_info *info;
577 info = IEEE80211_SKB_CB(skb);
579 /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
580 timeout = (sta->listen_interval *
581 sta->sdata->vif.bss_conf.beacon_int *
583 if (timeout < STA_TX_BUFFER_EXPIRE)
584 timeout = STA_TX_BUFFER_EXPIRE;
585 return time_after(jiffies, info->control.jiffies + timeout);
589 static bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
590 struct sta_info *sta)
595 if (skb_queue_empty(&sta->ps_tx_buf))
599 spin_lock_irqsave(&sta->ps_tx_buf.lock, flags);
600 skb = skb_peek(&sta->ps_tx_buf);
601 if (sta_info_buffer_expired(sta, skb))
602 skb = __skb_dequeue(&sta->ps_tx_buf);
605 spin_unlock_irqrestore(&sta->ps_tx_buf.lock, flags);
610 local->total_ps_buffered--;
611 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
612 printk(KERN_DEBUG "Buffered frame expired (STA %pM)\n",
617 if (skb_queue_empty(&sta->ps_tx_buf) &&
618 !test_sta_flags(sta, WLAN_STA_PS_DRIVER_BUF))
619 sta_info_clear_tim_bit(sta);
625 static int __must_check __sta_info_destroy(struct sta_info *sta)
627 struct ieee80211_local *local;
628 struct ieee80211_sub_if_data *sdata;
642 * Before removing the station from the driver and
643 * rate control, it might still start new aggregation
644 * sessions -- block that to make sure the tear-down
645 * will be sufficient.
647 set_sta_flags(sta, WLAN_STA_BLOCK_BA);
648 ieee80211_sta_tear_down_BA_sessions(sta, true);
650 spin_lock_irqsave(&local->sta_lock, flags);
651 ret = sta_info_hash_del(local, sta);
652 /* this might still be the pending list ... which is fine */
654 list_del(&sta->list);
655 spin_unlock_irqrestore(&local->sta_lock, flags);
659 mutex_lock(&local->key_mtx);
660 for (i = 0; i < NUM_DEFAULT_KEYS; i++)
661 __ieee80211_key_free(key_mtx_dereference(local, sta->gtk[i]));
663 __ieee80211_key_free(key_mtx_dereference(local, sta->ptk));
664 mutex_unlock(&local->key_mtx);
668 if (test_and_clear_sta_flags(sta,
669 WLAN_STA_PS_STA | WLAN_STA_PS_DRIVER)) {
672 atomic_dec(&sdata->bss->num_sta_ps);
673 sta_info_clear_tim_bit(sta);
677 local->sta_generation++;
679 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
680 rcu_assign_pointer(sdata->u.vlan.sta, NULL);
683 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
684 sdata = container_of(sdata->bss,
685 struct ieee80211_sub_if_data,
687 drv_sta_remove(local, sdata, &sta->sta);
692 * At this point, after we wait for an RCU grace period,
693 * neither mac80211 nor the driver can reference this
694 * sta struct any more except by still existing timers
695 * associated with this station that we clean up below.
699 #ifdef CONFIG_MAC80211_MESH
700 if (ieee80211_vif_is_mesh(&sdata->vif))
701 mesh_accept_plinks_update(sdata);
704 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
705 wiphy_debug(local->hw.wiphy, "Removed STA %pM\n", sta->sta.addr);
706 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
707 cancel_work_sync(&sta->drv_unblock_wk);
709 cfg80211_del_sta(sdata->dev, sta->sta.addr, GFP_KERNEL);
711 rate_control_remove_sta_debugfs(sta);
712 ieee80211_sta_debugfs_remove(sta);
714 #ifdef CONFIG_MAC80211_MESH
715 if (ieee80211_vif_is_mesh(&sta->sdata->vif)) {
716 mesh_plink_deactivate(sta);
717 del_timer_sync(&sta->plink_timer);
721 while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
722 local->total_ps_buffered--;
723 dev_kfree_skb_any(skb);
726 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL)
727 dev_kfree_skb_any(skb);
729 __sta_info_free(local, sta);
734 int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, const u8 *addr)
736 struct sta_info *sta;
739 mutex_lock(&sdata->local->sta_mtx);
740 sta = sta_info_get(sdata, addr);
741 ret = __sta_info_destroy(sta);
742 mutex_unlock(&sdata->local->sta_mtx);
747 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
750 struct sta_info *sta;
753 mutex_lock(&sdata->local->sta_mtx);
754 sta = sta_info_get_bss(sdata, addr);
755 ret = __sta_info_destroy(sta);
756 mutex_unlock(&sdata->local->sta_mtx);
761 static void sta_info_cleanup(unsigned long data)
763 struct ieee80211_local *local = (struct ieee80211_local *) data;
764 struct sta_info *sta;
765 bool timer_needed = false;
768 list_for_each_entry_rcu(sta, &local->sta_list, list)
769 if (sta_info_cleanup_expire_buffered(local, sta))
773 if (local->quiescing)
779 mod_timer(&local->sta_cleanup,
780 round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL));
783 void sta_info_init(struct ieee80211_local *local)
785 spin_lock_init(&local->sta_lock);
786 mutex_init(&local->sta_mtx);
787 INIT_LIST_HEAD(&local->sta_list);
788 INIT_LIST_HEAD(&local->sta_pending_list);
789 INIT_WORK(&local->sta_finish_work, sta_info_finish_work);
791 setup_timer(&local->sta_cleanup, sta_info_cleanup,
792 (unsigned long)local);
795 void sta_info_stop(struct ieee80211_local *local)
797 del_timer_sync(&local->sta_cleanup);
798 sta_info_flush(local, NULL);
802 * sta_info_flush - flush matching STA entries from the STA table
804 * Returns the number of removed STA entries.
806 * @local: local interface data
807 * @sdata: matching rule for the net device (sta->dev) or %NULL to match all STAs
809 int sta_info_flush(struct ieee80211_local *local,
810 struct ieee80211_sub_if_data *sdata)
812 struct sta_info *sta, *tmp;
817 mutex_lock(&local->sta_mtx);
819 sta_info_finish_pending(local);
821 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
822 if (!sdata || sdata == sta->sdata)
823 WARN_ON(__sta_info_destroy(sta));
825 mutex_unlock(&local->sta_mtx);
830 void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
831 unsigned long exp_time)
833 struct ieee80211_local *local = sdata->local;
834 struct sta_info *sta, *tmp;
836 mutex_lock(&local->sta_mtx);
837 list_for_each_entry_safe(sta, tmp, &local->sta_list, list)
838 if (time_after(jiffies, sta->last_rx + exp_time)) {
839 #ifdef CONFIG_MAC80211_IBSS_DEBUG
840 printk(KERN_DEBUG "%s: expiring inactive STA %pM\n",
841 sdata->name, sta->sta.addr);
843 WARN_ON(__sta_info_destroy(sta));
845 mutex_unlock(&local->sta_mtx);
848 struct ieee80211_sta *ieee80211_find_sta_by_ifaddr(struct ieee80211_hw *hw,
852 struct sta_info *sta, *nxt;
855 * Just return a random station if localaddr is NULL
858 for_each_sta_info(hw_to_local(hw), addr, sta, nxt) {
860 compare_ether_addr(sta->sdata->vif.addr, localaddr) != 0)
869 EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr);
871 struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif,
874 struct sta_info *sta;
879 sta = sta_info_get_bss(vif_to_sdata(vif), addr);
888 EXPORT_SYMBOL(ieee80211_find_sta);
890 static void clear_sta_ps_flags(void *_sta)
892 struct sta_info *sta = _sta;
894 clear_sta_flags(sta, WLAN_STA_PS_DRIVER | WLAN_STA_PS_STA);
897 /* powersave support code */
898 void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta)
900 struct ieee80211_sub_if_data *sdata = sta->sdata;
901 struct ieee80211_local *local = sdata->local;
904 clear_sta_flags(sta, WLAN_STA_PS_DRIVER_BUF);
905 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
906 drv_sta_notify(local, sdata, STA_NOTIFY_AWAKE, &sta->sta);
908 if (!skb_queue_empty(&sta->ps_tx_buf))
909 sta_info_clear_tim_bit(sta);
911 /* Send all buffered frames to the station */
912 sent = ieee80211_add_pending_skbs(local, &sta->tx_filtered);
913 buffered = ieee80211_add_pending_skbs_fn(local, &sta->ps_tx_buf,
914 clear_sta_ps_flags, sta);
916 local->total_ps_buffered -= buffered;
918 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
919 printk(KERN_DEBUG "%s: STA %pM aid %d sending %d filtered/%d PS frames "
920 "since STA not sleeping anymore\n", sdata->name,
921 sta->sta.addr, sta->sta.aid, sent - buffered, buffered);
922 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
925 void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta)
927 struct ieee80211_sub_if_data *sdata = sta->sdata;
928 struct ieee80211_local *local = sdata->local;
932 skb = skb_dequeue(&sta->tx_filtered);
934 skb = skb_dequeue(&sta->ps_tx_buf);
936 local->total_ps_buffered--;
938 no_pending_pkts = skb_queue_empty(&sta->tx_filtered) &&
939 skb_queue_empty(&sta->ps_tx_buf);
942 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
943 struct ieee80211_hdr *hdr =
944 (struct ieee80211_hdr *) skb->data;
947 * Tell TX path to send this frame even though the STA may
948 * still remain is PS mode after this frame exchange.
950 info->flags |= IEEE80211_TX_CTL_PSPOLL_RESPONSE;
952 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
953 printk(KERN_DEBUG "STA %pM aid %d: PS Poll (entries after %d)\n",
954 sta->sta.addr, sta->sta.aid,
955 skb_queue_len(&sta->ps_tx_buf));
956 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
958 /* Use MoreData flag to indicate whether there are more
959 * buffered frames for this STA */
961 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
963 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
965 ieee80211_add_pending_skb(local, skb);
968 sta_info_clear_tim_bit(sta);
969 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
972 * FIXME: This can be the result of a race condition between
973 * us expiring a frame and the station polling for it.
974 * Should we send it a null-func frame indicating we
975 * have nothing buffered for it?
977 printk(KERN_DEBUG "%s: STA %pM sent PS Poll even "
978 "though there are no buffered frames for it\n",
979 sdata->name, sta->sta.addr);
980 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
984 void ieee80211_sta_block_awake(struct ieee80211_hw *hw,
985 struct ieee80211_sta *pubsta, bool block)
987 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
989 trace_api_sta_block_awake(sta->local, pubsta, block);
992 set_sta_flags(sta, WLAN_STA_PS_DRIVER);
993 else if (test_sta_flags(sta, WLAN_STA_PS_DRIVER))
994 ieee80211_queue_work(hw, &sta->drv_unblock_wk);
996 EXPORT_SYMBOL(ieee80211_sta_block_awake);
998 void ieee80211_sta_set_tim(struct ieee80211_sta *pubsta)
1000 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1002 set_sta_flags(sta, WLAN_STA_PS_DRIVER_BUF);
1003 sta_info_set_tim_bit(sta);
1005 EXPORT_SYMBOL(ieee80211_sta_set_tim);