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 = local->sta_hash[STA_HASH(sta->sta.addr)];
74 rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)],
79 while (s->hnext && s->hnext != sta)
82 rcu_assign_pointer(s->hnext, sta->hnext);
89 /* protected by RCU */
90 struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata,
93 struct ieee80211_local *local = sdata->local;
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));
101 if (sta->sdata == sdata &&
102 memcmp(sta->sta.addr, addr, ETH_ALEN) == 0)
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));
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,
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));
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 rcu_read_lock_held() ||
133 lockdep_is_held(&local->sta_lock) ||
134 lockdep_is_held(&local->sta_mtx));
139 struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
142 struct ieee80211_local *local = sdata->local;
143 struct sta_info *sta;
146 list_for_each_entry_rcu(sta, &local->sta_list, list) {
147 if (sdata != sta->sdata)
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 */
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);
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);
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)
215 sta->rate_ctrl = rate_control_get(local->rate_ctrl);
216 sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl,
218 if (!sta->rate_ctrl_priv) {
219 rate_control_put(sta->rate_ctrl);
226 struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
229 struct ieee80211_local *local = sdata->local;
230 struct sta_info *sta;
231 struct timespec uptime;
234 sta = kzalloc(sizeof(*sta) + local->hw.sta_data_size, gfp);
238 spin_lock_init(&sta->lock);
239 spin_lock_init(&sta->flaglock);
240 INIT_WORK(&sta->drv_unblock_wk, sta_unblock);
241 INIT_WORK(&sta->ampdu_mlme.work, ieee80211_ba_session_work);
242 mutex_init(&sta->ampdu_mlme.mtx);
244 memcpy(sta->sta.addr, addr, ETH_ALEN);
247 sta->last_rx = jiffies;
249 do_posix_clock_monotonic_gettime(&uptime);
250 sta->last_connected = uptime.tv_sec;
251 ewma_init(&sta->avg_signal, 1024, 8);
253 if (sta_prepare_rate_control(local, sta, gfp)) {
258 for (i = 0; i < STA_TID_NUM; i++) {
260 * timer_to_tid must be initialized with identity mapping
261 * to enable session_timer's data differentiation. See
262 * sta_rx_agg_session_timer_expired for usage.
264 sta->timer_to_tid[i] = i;
266 skb_queue_head_init(&sta->ps_tx_buf);
267 skb_queue_head_init(&sta->tx_filtered);
269 for (i = 0; i < NUM_RX_DATA_QUEUES; i++)
270 sta->last_seq_ctrl[i] = cpu_to_le16(USHRT_MAX);
272 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
273 wiphy_debug(local->hw.wiphy, "Allocated STA %pM\n", sta->sta.addr);
274 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
276 #ifdef CONFIG_MAC80211_MESH
277 sta->plink_state = PLINK_LISTEN;
278 init_timer(&sta->plink_timer);
284 static int sta_info_finish_insert(struct sta_info *sta, bool async)
286 struct ieee80211_local *local = sta->local;
287 struct ieee80211_sub_if_data *sdata = sta->sdata;
288 struct station_info sinfo;
292 lockdep_assert_held(&local->sta_mtx);
295 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
296 sdata = container_of(sdata->bss,
297 struct ieee80211_sub_if_data,
299 err = drv_sta_add(local, sdata, &sta->sta);
303 printk(KERN_DEBUG "%s: failed to add IBSS STA %pM to driver (%d)"
304 " - keeping it anyway.\n",
305 sdata->name, sta->sta.addr, err);
307 sta->uploaded = true;
308 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
310 wiphy_debug(local->hw.wiphy,
311 "Finished adding IBSS STA %pM\n",
320 local->sta_generation++;
323 /* make the station visible */
324 spin_lock_irqsave(&local->sta_lock, flags);
325 sta_info_hash_add(local, sta);
326 spin_unlock_irqrestore(&local->sta_lock, flags);
329 list_add(&sta->list, &local->sta_list);
331 ieee80211_sta_debugfs_add(sta);
332 rate_control_add_sta_debugfs(sta);
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 int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU)
373 struct ieee80211_local *local = sta->local;
374 struct ieee80211_sub_if_data *sdata = sta->sdata;
379 * Can't be a WARN_ON because it can be triggered through a race:
380 * something inserts a STA (on one CPU) without holding the RTNL
381 * and another CPU turns off the net device.
383 if (unlikely(!ieee80211_sdata_running(sdata))) {
389 if (WARN_ON(compare_ether_addr(sta->sta.addr, sdata->vif.addr) == 0 ||
390 is_multicast_ether_addr(sta->sta.addr))) {
397 * In ad-hoc mode, we sometimes need to insert stations
398 * from tasklet context from the RX path. To avoid races,
399 * always do so in that case -- see the comment below.
401 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
402 spin_lock_irqsave(&local->sta_lock, flags);
403 /* check if STA exists already */
404 if (sta_info_get_bss(sdata, sta->sta.addr)) {
405 spin_unlock_irqrestore(&local->sta_lock, flags);
412 local->sta_generation++;
414 sta_info_hash_add(local, sta);
416 list_add_tail(&sta->list, &local->sta_pending_list);
419 spin_unlock_irqrestore(&local->sta_lock, flags);
421 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
422 wiphy_debug(local->hw.wiphy, "Added IBSS STA %pM\n",
424 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
426 ieee80211_queue_work(&local->hw, &local->sta_finish_work);
432 * On first glance, this will look racy, because the code
433 * below this point, which inserts a station with sleeping,
434 * unlocks the sta_lock between checking existence in the
435 * hash table and inserting into it.
437 * However, it is not racy against itself because it keeps
438 * the mutex locked. It still seems to race against the
439 * above code that atomically inserts the station... That,
440 * however, is not true because the above code can only
441 * be invoked for IBSS interfaces, and the below code will
442 * not be -- and the two do not race against each other as
443 * the hash table also keys off the interface.
448 mutex_lock(&local->sta_mtx);
450 spin_lock_irqsave(&local->sta_lock, flags);
451 /* check if STA exists already */
452 if (sta_info_get_bss(sdata, sta->sta.addr)) {
453 spin_unlock_irqrestore(&local->sta_lock, flags);
454 mutex_unlock(&local->sta_mtx);
460 spin_unlock_irqrestore(&local->sta_lock, flags);
462 err = sta_info_finish_insert(sta, false);
464 mutex_unlock(&local->sta_mtx);
469 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
470 wiphy_debug(local->hw.wiphy, "Inserted STA %pM\n", sta->sta.addr);
471 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
473 /* move reference to rcu-protected */
475 mutex_unlock(&local->sta_mtx);
477 if (ieee80211_vif_is_mesh(&sdata->vif))
478 mesh_accept_plinks_update(sdata);
483 __sta_info_free(local, sta);
487 int sta_info_insert(struct sta_info *sta)
489 int err = sta_info_insert_rcu(sta);
496 static inline void __bss_tim_set(struct ieee80211_if_ap *bss, u16 aid)
499 * This format has been mandated by the IEEE specifications,
500 * so this line may not be changed to use the __set_bit() format.
502 bss->tim[aid / 8] |= (1 << (aid % 8));
505 static inline void __bss_tim_clear(struct ieee80211_if_ap *bss, u16 aid)
508 * This format has been mandated by the IEEE specifications,
509 * so this line may not be changed to use the __clear_bit() format.
511 bss->tim[aid / 8] &= ~(1 << (aid % 8));
514 static void __sta_info_set_tim_bit(struct ieee80211_if_ap *bss,
515 struct sta_info *sta)
519 __bss_tim_set(bss, sta->sta.aid);
521 if (sta->local->ops->set_tim) {
522 sta->local->tim_in_locked_section = true;
523 drv_set_tim(sta->local, &sta->sta, true);
524 sta->local->tim_in_locked_section = false;
528 void sta_info_set_tim_bit(struct sta_info *sta)
532 BUG_ON(!sta->sdata->bss);
534 spin_lock_irqsave(&sta->local->sta_lock, flags);
535 __sta_info_set_tim_bit(sta->sdata->bss, sta);
536 spin_unlock_irqrestore(&sta->local->sta_lock, flags);
539 static void __sta_info_clear_tim_bit(struct ieee80211_if_ap *bss,
540 struct sta_info *sta)
544 __bss_tim_clear(bss, sta->sta.aid);
546 if (sta->local->ops->set_tim) {
547 sta->local->tim_in_locked_section = true;
548 drv_set_tim(sta->local, &sta->sta, false);
549 sta->local->tim_in_locked_section = false;
553 void sta_info_clear_tim_bit(struct sta_info *sta)
557 BUG_ON(!sta->sdata->bss);
559 spin_lock_irqsave(&sta->local->sta_lock, flags);
560 __sta_info_clear_tim_bit(sta->sdata->bss, sta);
561 spin_unlock_irqrestore(&sta->local->sta_lock, flags);
564 static int sta_info_buffer_expired(struct sta_info *sta,
567 struct ieee80211_tx_info *info;
573 info = IEEE80211_SKB_CB(skb);
575 /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
576 timeout = (sta->listen_interval *
577 sta->sdata->vif.bss_conf.beacon_int *
579 if (timeout < STA_TX_BUFFER_EXPIRE)
580 timeout = STA_TX_BUFFER_EXPIRE;
581 return time_after(jiffies, info->control.jiffies + timeout);
585 static bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
586 struct sta_info *sta)
591 if (skb_queue_empty(&sta->ps_tx_buf))
595 spin_lock_irqsave(&sta->ps_tx_buf.lock, flags);
596 skb = skb_peek(&sta->ps_tx_buf);
597 if (sta_info_buffer_expired(sta, skb))
598 skb = __skb_dequeue(&sta->ps_tx_buf);
601 spin_unlock_irqrestore(&sta->ps_tx_buf.lock, flags);
606 local->total_ps_buffered--;
607 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
608 printk(KERN_DEBUG "Buffered frame expired (STA %pM)\n",
613 if (skb_queue_empty(&sta->ps_tx_buf) &&
614 !test_sta_flags(sta, WLAN_STA_PS_DRIVER_BUF))
615 sta_info_clear_tim_bit(sta);
621 static int __must_check __sta_info_destroy(struct sta_info *sta)
623 struct ieee80211_local *local;
624 struct ieee80211_sub_if_data *sdata;
638 * Before removing the station from the driver and
639 * rate control, it might still start new aggregation
640 * sessions -- block that to make sure the tear-down
641 * will be sufficient.
643 set_sta_flags(sta, WLAN_STA_BLOCK_BA);
644 ieee80211_sta_tear_down_BA_sessions(sta, true);
646 spin_lock_irqsave(&local->sta_lock, flags);
647 ret = sta_info_hash_del(local, sta);
648 /* this might still be the pending list ... which is fine */
650 list_del(&sta->list);
651 spin_unlock_irqrestore(&local->sta_lock, flags);
655 for (i = 0; i < NUM_DEFAULT_KEYS; i++)
656 ieee80211_key_free(local, sta->gtk[i]);
658 ieee80211_key_free(local, sta->ptk);
662 if (test_and_clear_sta_flags(sta,
663 WLAN_STA_PS_STA | WLAN_STA_PS_DRIVER)) {
666 atomic_dec(&sdata->bss->num_sta_ps);
667 __sta_info_clear_tim_bit(sdata->bss, sta);
671 local->sta_generation++;
673 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
674 rcu_assign_pointer(sdata->u.vlan.sta, NULL);
677 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
678 sdata = container_of(sdata->bss,
679 struct ieee80211_sub_if_data,
681 drv_sta_remove(local, sdata, &sta->sta);
686 * At this point, after we wait for an RCU grace period,
687 * neither mac80211 nor the driver can reference this
688 * sta struct any more except by still existing timers
689 * associated with this station that we clean up below.
693 #ifdef CONFIG_MAC80211_MESH
694 if (ieee80211_vif_is_mesh(&sdata->vif))
695 mesh_accept_plinks_update(sdata);
698 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
699 wiphy_debug(local->hw.wiphy, "Removed STA %pM\n", sta->sta.addr);
700 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
701 cancel_work_sync(&sta->drv_unblock_wk);
703 cfg80211_del_sta(sdata->dev, sta->sta.addr, GFP_KERNEL);
705 rate_control_remove_sta_debugfs(sta);
706 ieee80211_sta_debugfs_remove(sta);
708 #ifdef CONFIG_MAC80211_MESH
709 if (ieee80211_vif_is_mesh(&sta->sdata->vif)) {
710 mesh_plink_deactivate(sta);
711 del_timer_sync(&sta->plink_timer);
715 while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
716 local->total_ps_buffered--;
717 dev_kfree_skb_any(skb);
720 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL)
721 dev_kfree_skb_any(skb);
723 __sta_info_free(local, sta);
728 int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, const u8 *addr)
730 struct sta_info *sta;
733 mutex_lock(&sdata->local->sta_mtx);
734 sta = sta_info_get(sdata, addr);
735 ret = __sta_info_destroy(sta);
736 mutex_unlock(&sdata->local->sta_mtx);
741 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
744 struct sta_info *sta;
747 mutex_lock(&sdata->local->sta_mtx);
748 sta = sta_info_get_bss(sdata, addr);
749 ret = __sta_info_destroy(sta);
750 mutex_unlock(&sdata->local->sta_mtx);
755 static void sta_info_cleanup(unsigned long data)
757 struct ieee80211_local *local = (struct ieee80211_local *) data;
758 struct sta_info *sta;
759 bool timer_needed = false;
762 list_for_each_entry_rcu(sta, &local->sta_list, list)
763 if (sta_info_cleanup_expire_buffered(local, sta))
767 if (local->quiescing)
773 mod_timer(&local->sta_cleanup,
774 round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL));
777 void sta_info_init(struct ieee80211_local *local)
779 spin_lock_init(&local->sta_lock);
780 mutex_init(&local->sta_mtx);
781 INIT_LIST_HEAD(&local->sta_list);
782 INIT_LIST_HEAD(&local->sta_pending_list);
783 INIT_WORK(&local->sta_finish_work, sta_info_finish_work);
785 setup_timer(&local->sta_cleanup, sta_info_cleanup,
786 (unsigned long)local);
789 void sta_info_stop(struct ieee80211_local *local)
791 del_timer(&local->sta_cleanup);
792 sta_info_flush(local, NULL);
796 * sta_info_flush - flush matching STA entries from the STA table
798 * Returns the number of removed STA entries.
800 * @local: local interface data
801 * @sdata: matching rule for the net device (sta->dev) or %NULL to match all STAs
803 int sta_info_flush(struct ieee80211_local *local,
804 struct ieee80211_sub_if_data *sdata)
806 struct sta_info *sta, *tmp;
811 mutex_lock(&local->sta_mtx);
813 sta_info_finish_pending(local);
815 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
816 if (!sdata || sdata == sta->sdata)
817 WARN_ON(__sta_info_destroy(sta));
819 mutex_unlock(&local->sta_mtx);
824 void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
825 unsigned long exp_time)
827 struct ieee80211_local *local = sdata->local;
828 struct sta_info *sta, *tmp;
830 mutex_lock(&local->sta_mtx);
831 list_for_each_entry_safe(sta, tmp, &local->sta_list, list)
832 if (time_after(jiffies, sta->last_rx + exp_time)) {
833 #ifdef CONFIG_MAC80211_IBSS_DEBUG
834 printk(KERN_DEBUG "%s: expiring inactive STA %pM\n",
835 sdata->name, sta->sta.addr);
837 WARN_ON(__sta_info_destroy(sta));
839 mutex_unlock(&local->sta_mtx);
842 struct ieee80211_sta *ieee80211_find_sta_by_ifaddr(struct ieee80211_hw *hw,
846 struct sta_info *sta, *nxt;
849 * Just return a random station if localaddr is NULL
852 for_each_sta_info(hw_to_local(hw), addr, sta, nxt) {
854 compare_ether_addr(sta->sdata->vif.addr, localaddr) != 0)
863 EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr);
865 struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif,
868 struct sta_info *sta;
873 sta = sta_info_get_bss(vif_to_sdata(vif), addr);
882 EXPORT_SYMBOL(ieee80211_find_sta);
884 static void clear_sta_ps_flags(void *_sta)
886 struct sta_info *sta = _sta;
888 clear_sta_flags(sta, WLAN_STA_PS_DRIVER | WLAN_STA_PS_STA);
891 /* powersave support code */
892 void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta)
894 struct ieee80211_sub_if_data *sdata = sta->sdata;
895 struct ieee80211_local *local = sdata->local;
898 clear_sta_flags(sta, WLAN_STA_PS_DRIVER_BUF);
899 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
900 drv_sta_notify(local, sdata, STA_NOTIFY_AWAKE, &sta->sta);
902 if (!skb_queue_empty(&sta->ps_tx_buf))
903 sta_info_clear_tim_bit(sta);
905 /* Send all buffered frames to the station */
906 sent = ieee80211_add_pending_skbs(local, &sta->tx_filtered);
907 buffered = ieee80211_add_pending_skbs_fn(local, &sta->ps_tx_buf,
908 clear_sta_ps_flags, sta);
910 local->total_ps_buffered -= buffered;
912 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
913 printk(KERN_DEBUG "%s: STA %pM aid %d sending %d filtered/%d PS frames "
914 "since STA not sleeping anymore\n", sdata->name,
915 sta->sta.addr, sta->sta.aid, sent - buffered, buffered);
916 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
919 void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta)
921 struct ieee80211_sub_if_data *sdata = sta->sdata;
922 struct ieee80211_local *local = sdata->local;
926 skb = skb_dequeue(&sta->tx_filtered);
928 skb = skb_dequeue(&sta->ps_tx_buf);
930 local->total_ps_buffered--;
932 no_pending_pkts = skb_queue_empty(&sta->tx_filtered) &&
933 skb_queue_empty(&sta->ps_tx_buf);
936 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
937 struct ieee80211_hdr *hdr =
938 (struct ieee80211_hdr *) skb->data;
941 * Tell TX path to send this frame even though the STA may
942 * still remain is PS mode after this frame exchange.
944 info->flags |= IEEE80211_TX_CTL_PSPOLL_RESPONSE;
946 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
947 printk(KERN_DEBUG "STA %pM aid %d: PS Poll (entries after %d)\n",
948 sta->sta.addr, sta->sta.aid,
949 skb_queue_len(&sta->ps_tx_buf));
950 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
952 /* Use MoreData flag to indicate whether there are more
953 * buffered frames for this STA */
955 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
957 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
959 ieee80211_add_pending_skb(local, skb);
962 sta_info_clear_tim_bit(sta);
963 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
966 * FIXME: This can be the result of a race condition between
967 * us expiring a frame and the station polling for it.
968 * Should we send it a null-func frame indicating we
969 * have nothing buffered for it?
971 printk(KERN_DEBUG "%s: STA %pM sent PS Poll even "
972 "though there are no buffered frames for it\n",
973 sdata->name, sta->sta.addr);
974 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
978 void ieee80211_sta_block_awake(struct ieee80211_hw *hw,
979 struct ieee80211_sta *pubsta, bool block)
981 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
983 trace_api_sta_block_awake(sta->local, pubsta, block);
986 set_sta_flags(sta, WLAN_STA_PS_DRIVER);
987 else if (test_sta_flags(sta, WLAN_STA_PS_DRIVER))
988 ieee80211_queue_work(hw, &sta->drv_unblock_wk);
990 EXPORT_SYMBOL(ieee80211_sta_block_awake);
992 void ieee80211_sta_set_tim(struct ieee80211_sta *pubsta)
994 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
996 set_sta_flags(sta, WLAN_STA_PS_DRIVER_BUF);
997 sta_info_set_tim_bit(sta);
999 EXPORT_SYMBOL(ieee80211_sta_set_tim);