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/etherdevice.h>
13 #include <linux/netdevice.h>
14 #include <linux/types.h>
15 #include <linux/slab.h>
16 #include <linux/skbuff.h>
17 #include <linux/if_arp.h>
18 #include <linux/timer.h>
19 #include <linux/rtnetlink.h>
21 #include <net/mac80211.h>
22 #include "ieee80211_i.h"
23 #include "driver-ops.h"
26 #include "debugfs_sta.h"
31 * DOC: STA information lifetime rules
33 * STA info structures (&struct sta_info) are managed in a hash table
34 * for faster lookup and a list for iteration. They are managed using
35 * RCU, i.e. access to the list and hash table is protected by RCU.
37 * Upon allocating a STA info structure with sta_info_alloc(), the caller
38 * owns that structure. It must then insert it into the hash table using
39 * either sta_info_insert() or sta_info_insert_rcu(); only in the latter
40 * case (which acquires an rcu read section but must not be called from
41 * within one) will the pointer still be valid after the call. Note that
42 * the caller may not do much with the STA info before inserting it, in
43 * particular, it may not start any mesh peer link management or add
46 * When the insertion fails (sta_info_insert()) returns non-zero), the
47 * structure will have been freed by sta_info_insert()!
49 * Station entries are added by mac80211 when you establish a link with a
50 * peer. This means different things for the different type of interfaces
51 * we support. For a regular station this mean we add the AP sta when we
52 * receive an association response from the AP. For IBSS this occurs when
53 * get to know about a peer on the same IBSS. For WDS we add the sta for
54 * the peer immediately upon device open. When using AP mode we add stations
55 * for each respective station upon request from userspace through nl80211.
57 * In order to remove a STA info structure, various sta_info_destroy_*()
58 * calls are available.
60 * There is no concept of ownership on a STA entry, each structure is
61 * owned by the global hash table/list until it is removed. All users of
62 * the structure need to be RCU protected so that the structure won't be
63 * freed before they are done using it.
66 /* Caller must hold local->sta_mtx */
67 static int sta_info_hash_del(struct ieee80211_local *local,
72 s = rcu_dereference_protected(local->sta_hash[STA_HASH(sta->sta.addr)],
73 lockdep_is_held(&local->sta_mtx));
77 rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)],
82 while (rcu_access_pointer(s->hnext) &&
83 rcu_access_pointer(s->hnext) != sta)
84 s = rcu_dereference_protected(s->hnext,
85 lockdep_is_held(&local->sta_mtx));
86 if (rcu_access_pointer(s->hnext)) {
87 rcu_assign_pointer(s->hnext, sta->hnext);
94 /* protected by RCU */
95 struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata,
98 struct ieee80211_local *local = sdata->local;
101 sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)],
102 lockdep_is_held(&local->sta_mtx));
104 if (sta->sdata == sdata &&
105 compare_ether_addr(sta->sta.addr, addr) == 0)
107 sta = rcu_dereference_check(sta->hnext,
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_mtx));
126 if ((sta->sdata == sdata ||
127 (sta->sdata->bss && sta->sdata->bss == sdata->bss)) &&
128 compare_ether_addr(sta->sta.addr, addr) == 0)
130 sta = rcu_dereference_check(sta->hnext,
131 lockdep_is_held(&local->sta_mtx));
136 struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
139 struct ieee80211_local *local = sdata->local;
140 struct sta_info *sta;
143 list_for_each_entry_rcu(sta, &local->sta_list, list) {
144 if (sdata != sta->sdata)
157 * sta_info_free - free STA
159 * @local: pointer to the global information
160 * @sta: STA info to free
162 * This function must undo everything done by sta_info_alloc()
163 * that may happen before sta_info_insert(). It may only be
164 * called when sta_info_insert() has not been attempted (and
165 * if that fails, the station is freed anyway.)
167 void sta_info_free(struct ieee80211_local *local, struct sta_info *sta)
170 rate_control_free_sta(sta);
172 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
173 wiphy_debug(local->hw.wiphy, "Destroyed STA %pM\n", sta->sta.addr);
174 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
179 /* Caller must hold local->sta_mtx */
180 static void sta_info_hash_add(struct ieee80211_local *local,
181 struct sta_info *sta)
183 lockdep_assert_held(&local->sta_mtx);
184 sta->hnext = local->sta_hash[STA_HASH(sta->sta.addr)];
185 rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)], sta);
188 static void sta_unblock(struct work_struct *wk)
190 struct sta_info *sta;
192 sta = container_of(wk, struct sta_info, drv_unblock_wk);
197 if (!test_sta_flag(sta, WLAN_STA_PS_STA)) {
199 ieee80211_sta_ps_deliver_wakeup(sta);
201 } else if (test_and_clear_sta_flag(sta, WLAN_STA_PSPOLL)) {
202 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
205 ieee80211_sta_ps_deliver_poll_response(sta);
207 } else if (test_and_clear_sta_flag(sta, WLAN_STA_UAPSD)) {
208 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
211 ieee80211_sta_ps_deliver_uapsd(sta);
214 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
217 static int sta_prepare_rate_control(struct ieee80211_local *local,
218 struct sta_info *sta, gfp_t gfp)
220 if (local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)
223 sta->rate_ctrl = local->rate_ctrl;
224 sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl,
226 if (!sta->rate_ctrl_priv)
232 struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
233 const u8 *addr, gfp_t gfp)
235 struct ieee80211_local *local = sdata->local;
236 struct sta_info *sta;
237 struct timespec uptime;
240 sta = kzalloc(sizeof(*sta) + local->hw.sta_data_size, gfp);
244 spin_lock_init(&sta->lock);
245 INIT_WORK(&sta->drv_unblock_wk, sta_unblock);
246 INIT_WORK(&sta->ampdu_mlme.work, ieee80211_ba_session_work);
247 mutex_init(&sta->ampdu_mlme.mtx);
249 memcpy(sta->sta.addr, addr, ETH_ALEN);
252 sta->last_rx = jiffies;
254 sta->sta_state = IEEE80211_STA_NONE;
256 do_posix_clock_monotonic_gettime(&uptime);
257 sta->last_connected = uptime.tv_sec;
258 ewma_init(&sta->avg_signal, 1024, 8);
260 if (sta_prepare_rate_control(local, sta, gfp)) {
265 for (i = 0; i < STA_TID_NUM; i++) {
267 * timer_to_tid must be initialized with identity mapping
268 * to enable session_timer's data differentiation. See
269 * sta_rx_agg_session_timer_expired for usage.
271 sta->timer_to_tid[i] = i;
273 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
274 skb_queue_head_init(&sta->ps_tx_buf[i]);
275 skb_queue_head_init(&sta->tx_filtered[i]);
278 for (i = 0; i < NUM_RX_DATA_QUEUES; i++)
279 sta->last_seq_ctrl[i] = cpu_to_le16(USHRT_MAX);
281 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
282 wiphy_debug(local->hw.wiphy, "Allocated STA %pM\n", sta->sta.addr);
283 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
285 #ifdef CONFIG_MAC80211_MESH
286 sta->plink_state = NL80211_PLINK_LISTEN;
287 init_timer(&sta->plink_timer);
293 static int sta_info_insert_check(struct sta_info *sta)
295 struct ieee80211_sub_if_data *sdata = sta->sdata;
298 * Can't be a WARN_ON because it can be triggered through a race:
299 * something inserts a STA (on one CPU) without holding the RTNL
300 * and another CPU turns off the net device.
302 if (unlikely(!ieee80211_sdata_running(sdata)))
305 if (WARN_ON(compare_ether_addr(sta->sta.addr, sdata->vif.addr) == 0 ||
306 is_multicast_ether_addr(sta->sta.addr)))
312 static int sta_info_insert_drv_state(struct ieee80211_local *local,
313 struct ieee80211_sub_if_data *sdata,
314 struct sta_info *sta)
316 enum ieee80211_sta_state state;
319 for (state = IEEE80211_STA_NOTEXIST; state < sta->sta_state; state++) {
320 err = drv_sta_state(local, sdata, sta, state, state + 1);
327 * Drivers using legacy sta_add/sta_remove callbacks only
328 * get uploaded set to true after sta_add is called.
330 if (!local->ops->sta_add)
331 sta->uploaded = true;
335 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
337 "%s: failed to move IBSS STA %pM to state %d (%d) - keeping it anyway.\n",
338 sdata->name, sta->sta.addr, state + 1, err);
342 /* unwind on error */
343 for (; state > IEEE80211_STA_NOTEXIST; state--)
344 WARN_ON(drv_sta_state(local, sdata, sta, state, state - 1));
350 * should be called with sta_mtx locked
351 * this function replaces the mutex lock
354 static int sta_info_insert_finish(struct sta_info *sta) __acquires(RCU)
356 struct ieee80211_local *local = sta->local;
357 struct ieee80211_sub_if_data *sdata = sta->sdata;
358 struct station_info sinfo;
361 lockdep_assert_held(&local->sta_mtx);
363 /* check if STA exists already */
364 if (sta_info_get_bss(sdata, sta->sta.addr)) {
370 err = sta_info_insert_drv_state(local, sdata, sta);
375 local->sta_generation++;
378 /* make the station visible */
379 sta_info_hash_add(local, sta);
381 list_add(&sta->list, &local->sta_list);
383 set_sta_flag(sta, WLAN_STA_INSERTED);
385 ieee80211_sta_debugfs_add(sta);
386 rate_control_add_sta_debugfs(sta);
388 memset(&sinfo, 0, sizeof(sinfo));
390 sinfo.generation = local->sta_generation;
391 cfg80211_new_sta(sdata->dev, sta->sta.addr, &sinfo, GFP_KERNEL);
393 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
394 wiphy_debug(local->hw.wiphy, "Inserted STA %pM\n", sta->sta.addr);
395 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
397 /* move reference to rcu-protected */
399 mutex_unlock(&local->sta_mtx);
401 if (ieee80211_vif_is_mesh(&sdata->vif))
402 mesh_accept_plinks_update(sdata);
406 mutex_unlock(&local->sta_mtx);
411 int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU)
413 struct ieee80211_local *local = sta->local;
418 err = sta_info_insert_check(sta);
424 mutex_lock(&local->sta_mtx);
426 err = sta_info_insert_finish(sta);
433 sta_info_free(local, sta);
437 int sta_info_insert(struct sta_info *sta)
439 int err = sta_info_insert_rcu(sta);
446 static inline void __bss_tim_set(struct ieee80211_if_ap *bss, u16 aid)
449 * This format has been mandated by the IEEE specifications,
450 * so this line may not be changed to use the __set_bit() format.
452 bss->tim[aid / 8] |= (1 << (aid % 8));
455 static inline void __bss_tim_clear(struct ieee80211_if_ap *bss, u16 aid)
458 * This format has been mandated by the IEEE specifications,
459 * so this line may not be changed to use the __clear_bit() format.
461 bss->tim[aid / 8] &= ~(1 << (aid % 8));
464 static unsigned long ieee80211_tids_for_ac(int ac)
466 /* If we ever support TIDs > 7, this obviously needs to be adjusted */
468 case IEEE80211_AC_VO:
469 return BIT(6) | BIT(7);
470 case IEEE80211_AC_VI:
471 return BIT(4) | BIT(5);
472 case IEEE80211_AC_BE:
473 return BIT(0) | BIT(3);
474 case IEEE80211_AC_BK:
475 return BIT(1) | BIT(2);
482 void sta_info_recalc_tim(struct sta_info *sta)
484 struct ieee80211_local *local = sta->local;
485 struct ieee80211_if_ap *bss = sta->sdata->bss;
487 bool indicate_tim = false;
488 u8 ignore_for_tim = sta->sta.uapsd_queues;
491 if (WARN_ON_ONCE(!sta->sdata->bss))
494 /* No need to do anything if the driver does all */
495 if (local->hw.flags & IEEE80211_HW_AP_LINK_PS)
502 * If all ACs are delivery-enabled then we should build
503 * the TIM bit for all ACs anyway; if only some are then
504 * we ignore those and build the TIM bit using only the
507 if (ignore_for_tim == BIT(IEEE80211_NUM_ACS) - 1)
510 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
513 if (ignore_for_tim & BIT(ac))
516 indicate_tim |= !skb_queue_empty(&sta->tx_filtered[ac]) ||
517 !skb_queue_empty(&sta->ps_tx_buf[ac]);
521 tids = ieee80211_tids_for_ac(ac);
524 sta->driver_buffered_tids & tids;
528 spin_lock_irqsave(&local->tim_lock, flags);
531 __bss_tim_set(bss, sta->sta.aid);
533 __bss_tim_clear(bss, sta->sta.aid);
535 if (local->ops->set_tim) {
536 local->tim_in_locked_section = true;
537 drv_set_tim(local, &sta->sta, indicate_tim);
538 local->tim_in_locked_section = false;
541 spin_unlock_irqrestore(&local->tim_lock, flags);
544 static bool sta_info_buffer_expired(struct sta_info *sta, struct sk_buff *skb)
546 struct ieee80211_tx_info *info;
552 info = IEEE80211_SKB_CB(skb);
554 /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
555 timeout = (sta->listen_interval *
556 sta->sdata->vif.bss_conf.beacon_int *
558 if (timeout < STA_TX_BUFFER_EXPIRE)
559 timeout = STA_TX_BUFFER_EXPIRE;
560 return time_after(jiffies, info->control.jiffies + timeout);
564 static bool sta_info_cleanup_expire_buffered_ac(struct ieee80211_local *local,
565 struct sta_info *sta, int ac)
571 * First check for frames that should expire on the filtered
572 * queue. Frames here were rejected by the driver and are on
573 * a separate queue to avoid reordering with normal PS-buffered
574 * frames. They also aren't accounted for right now in the
575 * total_ps_buffered counter.
578 spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
579 skb = skb_peek(&sta->tx_filtered[ac]);
580 if (sta_info_buffer_expired(sta, skb))
581 skb = __skb_dequeue(&sta->tx_filtered[ac]);
584 spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
587 * Frames are queued in order, so if this one
588 * hasn't expired yet we can stop testing. If
589 * we actually reached the end of the queue we
590 * also need to stop, of course.
598 * Now also check the normal PS-buffered queue, this will
599 * only find something if the filtered queue was emptied
600 * since the filtered frames are all before the normal PS
604 spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
605 skb = skb_peek(&sta->ps_tx_buf[ac]);
606 if (sta_info_buffer_expired(sta, skb))
607 skb = __skb_dequeue(&sta->ps_tx_buf[ac]);
610 spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
613 * frames are queued in order, so if this one
614 * hasn't expired yet (or we reached the end of
615 * the queue) we can stop testing
620 local->total_ps_buffered--;
621 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
622 printk(KERN_DEBUG "Buffered frame expired (STA %pM)\n",
629 * Finally, recalculate the TIM bit for this station -- it might
630 * now be clear because the station was too slow to retrieve its
633 sta_info_recalc_tim(sta);
636 * Return whether there are any frames still buffered, this is
637 * used to check whether the cleanup timer still needs to run,
638 * if there are no frames we don't need to rearm the timer.
640 return !(skb_queue_empty(&sta->ps_tx_buf[ac]) &&
641 skb_queue_empty(&sta->tx_filtered[ac]));
644 static bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
645 struct sta_info *sta)
647 bool have_buffered = false;
650 /* This is only necessary for stations on BSS interfaces */
651 if (!sta->sdata->bss)
654 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
656 sta_info_cleanup_expire_buffered_ac(local, sta, ac);
658 return have_buffered;
661 int __must_check __sta_info_destroy(struct sta_info *sta)
663 struct ieee80211_local *local;
664 struct ieee80211_sub_if_data *sdata;
666 struct tid_ampdu_tx *tid_tx;
676 lockdep_assert_held(&local->sta_mtx);
679 * Before removing the station from the driver and
680 * rate control, it might still start new aggregation
681 * sessions -- block that to make sure the tear-down
682 * will be sufficient.
684 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
685 ieee80211_sta_tear_down_BA_sessions(sta, true);
687 ret = sta_info_hash_del(local, sta);
691 list_del(&sta->list);
693 mutex_lock(&local->key_mtx);
694 for (i = 0; i < NUM_DEFAULT_KEYS; i++)
695 __ieee80211_key_free(key_mtx_dereference(local, sta->gtk[i]));
697 __ieee80211_key_free(key_mtx_dereference(local, sta->ptk));
698 mutex_unlock(&local->key_mtx);
703 local->sta_generation++;
705 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
706 RCU_INIT_POINTER(sdata->u.vlan.sta, NULL);
708 while (sta->sta_state > IEEE80211_STA_NONE) {
709 ret = sta_info_move_state(sta, sta->sta_state - 1);
717 ret = drv_sta_state(local, sdata, sta, IEEE80211_STA_NONE,
718 IEEE80211_STA_NOTEXIST);
719 WARN_ON_ONCE(ret != 0);
723 * At this point, after we wait for an RCU grace period,
724 * neither mac80211 nor the driver can reference this
725 * sta struct any more except by still existing timers
726 * associated with this station that we clean up below.
730 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
733 clear_sta_flag(sta, WLAN_STA_PS_STA);
735 atomic_dec(&sdata->bss->num_sta_ps);
736 sta_info_recalc_tim(sta);
739 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
740 local->total_ps_buffered -= skb_queue_len(&sta->ps_tx_buf[ac]);
741 __skb_queue_purge(&sta->ps_tx_buf[ac]);
742 __skb_queue_purge(&sta->tx_filtered[ac]);
745 #ifdef CONFIG_MAC80211_MESH
746 if (ieee80211_vif_is_mesh(&sdata->vif))
747 mesh_accept_plinks_update(sdata);
750 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
751 wiphy_debug(local->hw.wiphy, "Removed STA %pM\n", sta->sta.addr);
752 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
753 cancel_work_sync(&sta->drv_unblock_wk);
755 cfg80211_del_sta(sdata->dev, sta->sta.addr, GFP_KERNEL);
757 rate_control_remove_sta_debugfs(sta);
758 ieee80211_sta_debugfs_remove(sta);
760 #ifdef CONFIG_MAC80211_MESH
761 if (ieee80211_vif_is_mesh(&sta->sdata->vif)) {
762 mesh_plink_deactivate(sta);
763 del_timer_sync(&sta->plink_timer);
768 * Destroy aggregation state here. It would be nice to wait for the
769 * driver to finish aggregation stop and then clean up, but for now
770 * drivers have to handle aggregation stop being requested, followed
771 * directly by station destruction.
773 for (i = 0; i < STA_TID_NUM; i++) {
774 tid_tx = rcu_dereference_raw(sta->ampdu_mlme.tid_tx[i]);
777 __skb_queue_purge(&tid_tx->pending);
781 sta_info_free(local, sta);
786 int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, const u8 *addr)
788 struct sta_info *sta;
791 mutex_lock(&sdata->local->sta_mtx);
792 sta = sta_info_get(sdata, addr);
793 ret = __sta_info_destroy(sta);
794 mutex_unlock(&sdata->local->sta_mtx);
799 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
802 struct sta_info *sta;
805 mutex_lock(&sdata->local->sta_mtx);
806 sta = sta_info_get_bss(sdata, addr);
807 ret = __sta_info_destroy(sta);
808 mutex_unlock(&sdata->local->sta_mtx);
813 static void sta_info_cleanup(unsigned long data)
815 struct ieee80211_local *local = (struct ieee80211_local *) data;
816 struct sta_info *sta;
817 bool timer_needed = false;
820 list_for_each_entry_rcu(sta, &local->sta_list, list)
821 if (sta_info_cleanup_expire_buffered(local, sta))
825 if (local->quiescing)
831 mod_timer(&local->sta_cleanup,
832 round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL));
835 void sta_info_init(struct ieee80211_local *local)
837 spin_lock_init(&local->tim_lock);
838 mutex_init(&local->sta_mtx);
839 INIT_LIST_HEAD(&local->sta_list);
841 setup_timer(&local->sta_cleanup, sta_info_cleanup,
842 (unsigned long)local);
845 void sta_info_stop(struct ieee80211_local *local)
847 del_timer(&local->sta_cleanup);
848 sta_info_flush(local, NULL);
852 * sta_info_flush - flush matching STA entries from the STA table
854 * Returns the number of removed STA entries.
856 * @local: local interface data
857 * @sdata: matching rule for the net device (sta->dev) or %NULL to match all STAs
859 int sta_info_flush(struct ieee80211_local *local,
860 struct ieee80211_sub_if_data *sdata)
862 struct sta_info *sta, *tmp;
867 mutex_lock(&local->sta_mtx);
868 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
869 if (!sdata || sdata == sta->sdata) {
870 WARN_ON(__sta_info_destroy(sta));
874 mutex_unlock(&local->sta_mtx);
879 void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
880 unsigned long exp_time)
882 struct ieee80211_local *local = sdata->local;
883 struct sta_info *sta, *tmp;
885 mutex_lock(&local->sta_mtx);
887 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
888 if (sdata != sta->sdata)
891 if (time_after(jiffies, sta->last_rx + exp_time)) {
892 #ifdef CONFIG_MAC80211_IBSS_DEBUG
893 printk(KERN_DEBUG "%s: expiring inactive STA %pM\n",
894 sdata->name, sta->sta.addr);
896 WARN_ON(__sta_info_destroy(sta));
900 mutex_unlock(&local->sta_mtx);
903 struct ieee80211_sta *ieee80211_find_sta_by_ifaddr(struct ieee80211_hw *hw,
907 struct sta_info *sta, *nxt;
910 * Just return a random station if localaddr is NULL
913 for_each_sta_info(hw_to_local(hw), addr, sta, nxt) {
915 compare_ether_addr(sta->sdata->vif.addr, localaddr) != 0)
924 EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr);
926 struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif,
929 struct sta_info *sta;
934 sta = sta_info_get_bss(vif_to_sdata(vif), addr);
943 EXPORT_SYMBOL(ieee80211_find_sta);
945 static void clear_sta_ps_flags(void *_sta)
947 struct sta_info *sta = _sta;
948 struct ieee80211_sub_if_data *sdata = sta->sdata;
950 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
951 if (test_and_clear_sta_flag(sta, WLAN_STA_PS_STA))
952 atomic_dec(&sdata->bss->num_sta_ps);
955 /* powersave support code */
956 void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta)
958 struct ieee80211_sub_if_data *sdata = sta->sdata;
959 struct ieee80211_local *local = sdata->local;
960 struct sk_buff_head pending;
961 int filtered = 0, buffered = 0, ac;
963 clear_sta_flag(sta, WLAN_STA_SP);
965 BUILD_BUG_ON(BITS_TO_LONGS(STA_TID_NUM) > 1);
966 sta->driver_buffered_tids = 0;
968 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
969 drv_sta_notify(local, sdata, STA_NOTIFY_AWAKE, &sta->sta);
971 skb_queue_head_init(&pending);
973 /* Send all buffered frames to the station */
974 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
975 int count = skb_queue_len(&pending), tmp;
977 skb_queue_splice_tail_init(&sta->tx_filtered[ac], &pending);
978 tmp = skb_queue_len(&pending);
979 filtered += tmp - count;
982 skb_queue_splice_tail_init(&sta->ps_tx_buf[ac], &pending);
983 tmp = skb_queue_len(&pending);
984 buffered += tmp - count;
987 ieee80211_add_pending_skbs_fn(local, &pending, clear_sta_ps_flags, sta);
989 local->total_ps_buffered -= buffered;
991 sta_info_recalc_tim(sta);
993 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
994 printk(KERN_DEBUG "%s: STA %pM aid %d sending %d filtered/%d PS frames "
995 "since STA not sleeping anymore\n", sdata->name,
996 sta->sta.addr, sta->sta.aid, filtered, buffered);
997 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1000 static void ieee80211_send_null_response(struct ieee80211_sub_if_data *sdata,
1001 struct sta_info *sta, int tid,
1002 enum ieee80211_frame_release_type reason)
1004 struct ieee80211_local *local = sdata->local;
1005 struct ieee80211_qos_hdr *nullfunc;
1006 struct sk_buff *skb;
1007 int size = sizeof(*nullfunc);
1009 bool qos = test_sta_flag(sta, WLAN_STA_WME);
1010 struct ieee80211_tx_info *info;
1013 fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1014 IEEE80211_STYPE_QOS_NULLFUNC |
1015 IEEE80211_FCTL_FROMDS);
1018 fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1019 IEEE80211_STYPE_NULLFUNC |
1020 IEEE80211_FCTL_FROMDS);
1023 skb = dev_alloc_skb(local->hw.extra_tx_headroom + size);
1027 skb_reserve(skb, local->hw.extra_tx_headroom);
1029 nullfunc = (void *) skb_put(skb, size);
1030 nullfunc->frame_control = fc;
1031 nullfunc->duration_id = 0;
1032 memcpy(nullfunc->addr1, sta->sta.addr, ETH_ALEN);
1033 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
1034 memcpy(nullfunc->addr3, sdata->vif.addr, ETH_ALEN);
1036 skb->priority = tid;
1037 skb_set_queue_mapping(skb, ieee802_1d_to_ac[tid]);
1039 nullfunc->qos_ctrl = cpu_to_le16(tid);
1041 if (reason == IEEE80211_FRAME_RELEASE_UAPSD)
1042 nullfunc->qos_ctrl |=
1043 cpu_to_le16(IEEE80211_QOS_CTL_EOSP);
1046 info = IEEE80211_SKB_CB(skb);
1049 * Tell TX path to send this frame even though the
1050 * STA may still remain is PS mode after this frame
1051 * exchange. Also set EOSP to indicate this packet
1052 * ends the poll/service period.
1054 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER |
1055 IEEE80211_TX_STATUS_EOSP |
1056 IEEE80211_TX_CTL_REQ_TX_STATUS;
1058 drv_allow_buffered_frames(local, sta, BIT(tid), 1, reason, false);
1060 ieee80211_xmit(sdata, skb);
1064 ieee80211_sta_ps_deliver_response(struct sta_info *sta,
1065 int n_frames, u8 ignored_acs,
1066 enum ieee80211_frame_release_type reason)
1068 struct ieee80211_sub_if_data *sdata = sta->sdata;
1069 struct ieee80211_local *local = sdata->local;
1071 bool more_data = false;
1073 unsigned long driver_release_tids = 0;
1074 struct sk_buff_head frames;
1076 /* Service or PS-Poll period starts */
1077 set_sta_flag(sta, WLAN_STA_SP);
1079 __skb_queue_head_init(&frames);
1082 * Get response frame(s) and more data bit for it.
1084 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1087 if (ignored_acs & BIT(ac))
1090 tids = ieee80211_tids_for_ac(ac);
1093 driver_release_tids = sta->driver_buffered_tids & tids;
1094 if (driver_release_tids) {
1097 struct sk_buff *skb;
1099 while (n_frames > 0) {
1100 skb = skb_dequeue(&sta->tx_filtered[ac]);
1103 &sta->ps_tx_buf[ac]);
1105 local->total_ps_buffered--;
1111 __skb_queue_tail(&frames, skb);
1116 * If the driver has data on more than one TID then
1117 * certainly there's more data if we release just a
1118 * single frame now (from a single TID).
1120 if (reason == IEEE80211_FRAME_RELEASE_PSPOLL &&
1121 hweight16(driver_release_tids) > 1) {
1123 driver_release_tids =
1124 BIT(ffs(driver_release_tids) - 1);
1129 if (!skb_queue_empty(&sta->tx_filtered[ac]) ||
1130 !skb_queue_empty(&sta->ps_tx_buf[ac])) {
1140 * For PS-Poll, this can only happen due to a race condition
1141 * when we set the TIM bit and the station notices it, but
1142 * before it can poll for the frame we expire it.
1144 * For uAPSD, this is said in the standard (11.2.1.5 h):
1145 * At each unscheduled SP for a non-AP STA, the AP shall
1146 * attempt to transmit at least one MSDU or MMPDU, but no
1147 * more than the value specified in the Max SP Length field
1148 * in the QoS Capability element from delivery-enabled ACs,
1149 * that are destined for the non-AP STA.
1151 * Since we have no other MSDU/MMPDU, transmit a QoS null frame.
1154 /* This will evaluate to 1, 3, 5 or 7. */
1155 tid = 7 - ((ffs(~ignored_acs) - 1) << 1);
1157 ieee80211_send_null_response(sdata, sta, tid, reason);
1161 if (!driver_release_tids) {
1162 struct sk_buff_head pending;
1163 struct sk_buff *skb;
1167 skb_queue_head_init(&pending);
1169 while ((skb = __skb_dequeue(&frames))) {
1170 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1171 struct ieee80211_hdr *hdr = (void *) skb->data;
1177 * Tell TX path to send this frame even though the
1178 * STA may still remain is PS mode after this frame
1181 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
1184 * Use MoreData flag to indicate whether there are
1185 * more buffered frames for this STA
1187 if (more_data || !skb_queue_empty(&frames))
1188 hdr->frame_control |=
1189 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1191 hdr->frame_control &=
1192 cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
1194 if (ieee80211_is_data_qos(hdr->frame_control) ||
1195 ieee80211_is_qos_nullfunc(hdr->frame_control))
1196 qoshdr = ieee80211_get_qos_ctl(hdr);
1198 /* end service period after last frame */
1199 if (skb_queue_empty(&frames)) {
1200 if (reason == IEEE80211_FRAME_RELEASE_UAPSD &&
1202 *qoshdr |= IEEE80211_QOS_CTL_EOSP;
1204 info->flags |= IEEE80211_TX_STATUS_EOSP |
1205 IEEE80211_TX_CTL_REQ_TX_STATUS;
1209 tids |= BIT(*qoshdr & IEEE80211_QOS_CTL_TID_MASK);
1213 __skb_queue_tail(&pending, skb);
1216 drv_allow_buffered_frames(local, sta, tids, num,
1219 ieee80211_add_pending_skbs(local, &pending);
1221 sta_info_recalc_tim(sta);
1224 * We need to release a frame that is buffered somewhere in the
1225 * driver ... it'll have to handle that.
1226 * Note that, as per the comment above, it'll also have to see
1227 * if there is more than just one frame on the specific TID that
1228 * we're releasing from, and it needs to set the more-data bit
1229 * accordingly if we tell it that there's no more data. If we do
1230 * tell it there's more data, then of course the more-data bit
1231 * needs to be set anyway.
1233 drv_release_buffered_frames(local, sta, driver_release_tids,
1234 n_frames, reason, more_data);
1237 * Note that we don't recalculate the TIM bit here as it would
1238 * most likely have no effect at all unless the driver told us
1239 * that the TID became empty before returning here from the
1241 * Either way, however, when the driver tells us that the TID
1242 * became empty we'll do the TIM recalculation.
1247 void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta)
1249 u8 ignore_for_response = sta->sta.uapsd_queues;
1252 * If all ACs are delivery-enabled then we should reply
1253 * from any of them, if only some are enabled we reply
1254 * only from the non-enabled ones.
1256 if (ignore_for_response == BIT(IEEE80211_NUM_ACS) - 1)
1257 ignore_for_response = 0;
1259 ieee80211_sta_ps_deliver_response(sta, 1, ignore_for_response,
1260 IEEE80211_FRAME_RELEASE_PSPOLL);
1263 void ieee80211_sta_ps_deliver_uapsd(struct sta_info *sta)
1265 int n_frames = sta->sta.max_sp;
1266 u8 delivery_enabled = sta->sta.uapsd_queues;
1269 * If we ever grow support for TSPEC this might happen if
1270 * the TSPEC update from hostapd comes in between a trigger
1271 * frame setting WLAN_STA_UAPSD in the RX path and this
1272 * actually getting called.
1274 if (!delivery_enabled)
1277 switch (sta->sta.max_sp) {
1288 /* XXX: what is a good value? */
1293 ieee80211_sta_ps_deliver_response(sta, n_frames, ~delivery_enabled,
1294 IEEE80211_FRAME_RELEASE_UAPSD);
1297 void ieee80211_sta_block_awake(struct ieee80211_hw *hw,
1298 struct ieee80211_sta *pubsta, bool block)
1300 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1302 trace_api_sta_block_awake(sta->local, pubsta, block);
1305 set_sta_flag(sta, WLAN_STA_PS_DRIVER);
1306 else if (test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1307 ieee80211_queue_work(hw, &sta->drv_unblock_wk);
1309 EXPORT_SYMBOL(ieee80211_sta_block_awake);
1311 void ieee80211_sta_eosp_irqsafe(struct ieee80211_sta *pubsta)
1313 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1314 struct ieee80211_local *local = sta->local;
1315 struct sk_buff *skb;
1316 struct skb_eosp_msg_data *data;
1318 trace_api_eosp(local, pubsta);
1320 skb = alloc_skb(0, GFP_ATOMIC);
1322 /* too bad ... but race is better than loss */
1323 clear_sta_flag(sta, WLAN_STA_SP);
1327 data = (void *)skb->cb;
1328 memcpy(data->sta, pubsta->addr, ETH_ALEN);
1329 memcpy(data->iface, sta->sdata->vif.addr, ETH_ALEN);
1330 skb->pkt_type = IEEE80211_EOSP_MSG;
1331 skb_queue_tail(&local->skb_queue, skb);
1332 tasklet_schedule(&local->tasklet);
1334 EXPORT_SYMBOL(ieee80211_sta_eosp_irqsafe);
1336 void ieee80211_sta_set_buffered(struct ieee80211_sta *pubsta,
1337 u8 tid, bool buffered)
1339 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1341 if (WARN_ON(tid >= STA_TID_NUM))
1345 set_bit(tid, &sta->driver_buffered_tids);
1347 clear_bit(tid, &sta->driver_buffered_tids);
1349 sta_info_recalc_tim(sta);
1351 EXPORT_SYMBOL(ieee80211_sta_set_buffered);
1353 int sta_info_move_state(struct sta_info *sta,
1354 enum ieee80211_sta_state new_state)
1358 if (sta->sta_state == new_state)
1361 /* check allowed transitions first */
1363 switch (new_state) {
1364 case IEEE80211_STA_NONE:
1365 if (sta->sta_state != IEEE80211_STA_AUTH)
1368 case IEEE80211_STA_AUTH:
1369 if (sta->sta_state != IEEE80211_STA_NONE &&
1370 sta->sta_state != IEEE80211_STA_ASSOC)
1373 case IEEE80211_STA_ASSOC:
1374 if (sta->sta_state != IEEE80211_STA_AUTH &&
1375 sta->sta_state != IEEE80211_STA_AUTHORIZED)
1378 case IEEE80211_STA_AUTHORIZED:
1379 if (sta->sta_state != IEEE80211_STA_ASSOC)
1383 WARN(1, "invalid state %d", new_state);
1387 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1388 printk(KERN_DEBUG "%s: moving STA %pM to state %d\n",
1389 sta->sdata->name, sta->sta.addr, new_state);
1393 * notify the driver before the actual changes so it can
1394 * fail the transition
1396 if (test_sta_flag(sta, WLAN_STA_INSERTED)) {
1397 int err = drv_sta_state(sta->local, sta->sdata, sta,
1398 sta->sta_state, new_state);
1403 /* reflect the change in all state variables */
1405 switch (new_state) {
1406 case IEEE80211_STA_NONE:
1407 if (sta->sta_state == IEEE80211_STA_AUTH)
1408 clear_bit(WLAN_STA_AUTH, &sta->_flags);
1410 case IEEE80211_STA_AUTH:
1411 if (sta->sta_state == IEEE80211_STA_NONE)
1412 set_bit(WLAN_STA_AUTH, &sta->_flags);
1413 else if (sta->sta_state == IEEE80211_STA_ASSOC)
1414 clear_bit(WLAN_STA_ASSOC, &sta->_flags);
1416 case IEEE80211_STA_ASSOC:
1417 if (sta->sta_state == IEEE80211_STA_AUTH) {
1418 set_bit(WLAN_STA_ASSOC, &sta->_flags);
1419 } else if (sta->sta_state == IEEE80211_STA_AUTHORIZED) {
1420 if (sta->sdata->vif.type == NL80211_IFTYPE_AP)
1421 atomic_dec(&sta->sdata->u.ap.num_mcast_sta);
1422 clear_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
1425 case IEEE80211_STA_AUTHORIZED:
1426 if (sta->sta_state == IEEE80211_STA_ASSOC) {
1427 if (sta->sdata->vif.type == NL80211_IFTYPE_AP)
1428 atomic_inc(&sta->sdata->u.ap.num_mcast_sta);
1429 set_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
1436 sta->sta_state = new_state;