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 static void cleanup_single_sta(struct sta_info *sta)
97 struct tid_ampdu_tx *tid_tx;
98 struct ieee80211_sub_if_data *sdata = sta->sdata;
99 struct ieee80211_local *local = sdata->local;
103 * At this point, when being called as call_rcu callback,
104 * neither mac80211 nor the driver can reference this
105 * sta struct any more except by still existing timers
106 * associated with this station that we clean up below.
108 * Note though that this still uses the sdata and even
109 * calls the driver in AP and mesh mode, so interfaces
110 * of those types mush use call sta_info_flush_cleanup()
111 * (typically via sta_info_flush()) before deconfiguring
114 * In station mode, nothing happens here so it doesn't
115 * have to (and doesn't) do that, this is intentional to
119 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
120 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
121 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
122 ps = &sdata->bss->ps;
126 clear_sta_flag(sta, WLAN_STA_PS_STA);
128 atomic_dec(&ps->num_sta_ps);
129 sta_info_recalc_tim(sta);
132 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
133 local->total_ps_buffered -= skb_queue_len(&sta->ps_tx_buf[ac]);
134 ieee80211_purge_tx_queue(&local->hw, &sta->ps_tx_buf[ac]);
135 ieee80211_purge_tx_queue(&local->hw, &sta->tx_filtered[ac]);
138 #ifdef CONFIG_MAC80211_MESH
139 if (ieee80211_vif_is_mesh(&sdata->vif)) {
140 mesh_accept_plinks_update(sdata);
141 mesh_plink_deactivate(sta);
142 del_timer_sync(&sta->plink_timer);
146 cancel_work_sync(&sta->drv_unblock_wk);
149 * Destroy aggregation state here. It would be nice to wait for the
150 * driver to finish aggregation stop and then clean up, but for now
151 * drivers have to handle aggregation stop being requested, followed
152 * directly by station destruction.
154 for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
155 tid_tx = rcu_dereference_raw(sta->ampdu_mlme.tid_tx[i]);
158 ieee80211_purge_tx_queue(&local->hw, &tid_tx->pending);
162 sta_info_free(local, sta);
165 void ieee80211_cleanup_sdata_stas(struct ieee80211_sub_if_data *sdata)
167 struct sta_info *sta;
169 spin_lock_bh(&sdata->cleanup_stations_lock);
170 while (!list_empty(&sdata->cleanup_stations)) {
171 sta = list_first_entry(&sdata->cleanup_stations,
172 struct sta_info, list);
173 list_del(&sta->list);
174 spin_unlock_bh(&sdata->cleanup_stations_lock);
176 cleanup_single_sta(sta);
178 spin_lock_bh(&sdata->cleanup_stations_lock);
181 spin_unlock_bh(&sdata->cleanup_stations_lock);
184 static void free_sta_rcu(struct rcu_head *h)
186 struct sta_info *sta = container_of(h, struct sta_info, rcu_head);
187 struct ieee80211_sub_if_data *sdata = sta->sdata;
189 spin_lock(&sdata->cleanup_stations_lock);
190 list_add_tail(&sta->list, &sdata->cleanup_stations);
191 spin_unlock(&sdata->cleanup_stations_lock);
193 ieee80211_queue_work(&sdata->local->hw, &sdata->cleanup_stations_wk);
196 /* protected by RCU */
197 struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata,
200 struct ieee80211_local *local = sdata->local;
201 struct sta_info *sta;
203 sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)],
204 lockdep_is_held(&local->sta_mtx));
206 if (sta->sdata == sdata &&
207 ether_addr_equal(sta->sta.addr, addr))
209 sta = rcu_dereference_check(sta->hnext,
210 lockdep_is_held(&local->sta_mtx));
216 * Get sta info either from the specified interface
217 * or from one of its vlans
219 struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata,
222 struct ieee80211_local *local = sdata->local;
223 struct sta_info *sta;
225 sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)],
226 lockdep_is_held(&local->sta_mtx));
228 if ((sta->sdata == sdata ||
229 (sta->sdata->bss && sta->sdata->bss == sdata->bss)) &&
230 ether_addr_equal(sta->sta.addr, addr))
232 sta = rcu_dereference_check(sta->hnext,
233 lockdep_is_held(&local->sta_mtx));
238 struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
241 struct ieee80211_local *local = sdata->local;
242 struct sta_info *sta;
245 list_for_each_entry_rcu(sta, &local->sta_list, list) {
246 if (sdata != sta->sdata)
259 * sta_info_free - free STA
261 * @local: pointer to the global information
262 * @sta: STA info to free
264 * This function must undo everything done by sta_info_alloc()
265 * that may happen before sta_info_insert(). It may only be
266 * called when sta_info_insert() has not been attempted (and
267 * if that fails, the station is freed anyway.)
269 void sta_info_free(struct ieee80211_local *local, struct sta_info *sta)
272 rate_control_free_sta(sta);
274 sta_dbg(sta->sdata, "Destroyed STA %pM\n", sta->sta.addr);
279 /* Caller must hold local->sta_mtx */
280 static void sta_info_hash_add(struct ieee80211_local *local,
281 struct sta_info *sta)
283 lockdep_assert_held(&local->sta_mtx);
284 sta->hnext = local->sta_hash[STA_HASH(sta->sta.addr)];
285 rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)], sta);
288 static void sta_unblock(struct work_struct *wk)
290 struct sta_info *sta;
292 sta = container_of(wk, struct sta_info, drv_unblock_wk);
297 if (!test_sta_flag(sta, WLAN_STA_PS_STA)) {
299 ieee80211_sta_ps_deliver_wakeup(sta);
301 } else if (test_and_clear_sta_flag(sta, WLAN_STA_PSPOLL)) {
302 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
305 ieee80211_sta_ps_deliver_poll_response(sta);
307 } else if (test_and_clear_sta_flag(sta, WLAN_STA_UAPSD)) {
308 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
311 ieee80211_sta_ps_deliver_uapsd(sta);
314 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
317 static int sta_prepare_rate_control(struct ieee80211_local *local,
318 struct sta_info *sta, gfp_t gfp)
320 if (local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)
323 sta->rate_ctrl = local->rate_ctrl;
324 sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl,
326 if (!sta->rate_ctrl_priv)
332 struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
333 const u8 *addr, gfp_t gfp)
335 struct ieee80211_local *local = sdata->local;
336 struct sta_info *sta;
337 struct timespec uptime;
340 sta = kzalloc(sizeof(*sta) + local->hw.sta_data_size, gfp);
344 spin_lock_init(&sta->lock);
345 INIT_WORK(&sta->drv_unblock_wk, sta_unblock);
346 INIT_WORK(&sta->ampdu_mlme.work, ieee80211_ba_session_work);
347 mutex_init(&sta->ampdu_mlme.mtx);
349 memcpy(sta->sta.addr, addr, ETH_ALEN);
352 sta->last_rx = jiffies;
354 sta->sta_state = IEEE80211_STA_NONE;
356 do_posix_clock_monotonic_gettime(&uptime);
357 sta->last_connected = uptime.tv_sec;
358 ewma_init(&sta->avg_signal, 1024, 8);
360 if (sta_prepare_rate_control(local, sta, gfp)) {
365 for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
367 * timer_to_tid must be initialized with identity mapping
368 * to enable session_timer's data differentiation. See
369 * sta_rx_agg_session_timer_expired for usage.
371 sta->timer_to_tid[i] = i;
373 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
374 skb_queue_head_init(&sta->ps_tx_buf[i]);
375 skb_queue_head_init(&sta->tx_filtered[i]);
378 for (i = 0; i < IEEE80211_NUM_TIDS; i++)
379 sta->last_seq_ctrl[i] = cpu_to_le16(USHRT_MAX);
381 sta_dbg(sdata, "Allocated STA %pM\n", sta->sta.addr);
386 static int sta_info_insert_check(struct sta_info *sta)
388 struct ieee80211_sub_if_data *sdata = sta->sdata;
391 * Can't be a WARN_ON because it can be triggered through a race:
392 * something inserts a STA (on one CPU) without holding the RTNL
393 * and another CPU turns off the net device.
395 if (unlikely(!ieee80211_sdata_running(sdata)))
398 if (WARN_ON(ether_addr_equal(sta->sta.addr, sdata->vif.addr) ||
399 is_multicast_ether_addr(sta->sta.addr)))
405 static int sta_info_insert_drv_state(struct ieee80211_local *local,
406 struct ieee80211_sub_if_data *sdata,
407 struct sta_info *sta)
409 enum ieee80211_sta_state state;
412 for (state = IEEE80211_STA_NOTEXIST; state < sta->sta_state; state++) {
413 err = drv_sta_state(local, sdata, sta, state, state + 1);
420 * Drivers using legacy sta_add/sta_remove callbacks only
421 * get uploaded set to true after sta_add is called.
423 if (!local->ops->sta_add)
424 sta->uploaded = true;
428 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
430 "failed to move IBSS STA %pM to state %d (%d) - keeping it anyway\n",
431 sta->sta.addr, state + 1, err);
435 /* unwind on error */
436 for (; state > IEEE80211_STA_NOTEXIST; state--)
437 WARN_ON(drv_sta_state(local, sdata, sta, state, state - 1));
443 * should be called with sta_mtx locked
444 * this function replaces the mutex lock
447 static int sta_info_insert_finish(struct sta_info *sta) __acquires(RCU)
449 struct ieee80211_local *local = sta->local;
450 struct ieee80211_sub_if_data *sdata = sta->sdata;
451 struct station_info sinfo;
454 lockdep_assert_held(&local->sta_mtx);
456 /* check if STA exists already */
457 if (sta_info_get_bss(sdata, sta->sta.addr)) {
463 err = sta_info_insert_drv_state(local, sdata, sta);
468 local->sta_generation++;
471 /* make the station visible */
472 sta_info_hash_add(local, sta);
474 list_add_rcu(&sta->list, &local->sta_list);
476 set_sta_flag(sta, WLAN_STA_INSERTED);
478 ieee80211_sta_debugfs_add(sta);
479 rate_control_add_sta_debugfs(sta);
481 memset(&sinfo, 0, sizeof(sinfo));
483 sinfo.generation = local->sta_generation;
484 cfg80211_new_sta(sdata->dev, sta->sta.addr, &sinfo, GFP_KERNEL);
486 sta_dbg(sdata, "Inserted STA %pM\n", sta->sta.addr);
488 /* move reference to rcu-protected */
490 mutex_unlock(&local->sta_mtx);
492 if (ieee80211_vif_is_mesh(&sdata->vif))
493 mesh_accept_plinks_update(sdata);
497 mutex_unlock(&local->sta_mtx);
502 int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU)
504 struct ieee80211_local *local = sta->local;
509 err = sta_info_insert_check(sta);
515 mutex_lock(&local->sta_mtx);
517 err = sta_info_insert_finish(sta);
524 sta_info_free(local, sta);
528 int sta_info_insert(struct sta_info *sta)
530 int err = sta_info_insert_rcu(sta);
537 static inline void __bss_tim_set(u8 *tim, u16 id)
540 * This format has been mandated by the IEEE specifications,
541 * so this line may not be changed to use the __set_bit() format.
543 tim[id / 8] |= (1 << (id % 8));
546 static inline void __bss_tim_clear(u8 *tim, u16 id)
549 * This format has been mandated by the IEEE specifications,
550 * so this line may not be changed to use the __clear_bit() format.
552 tim[id / 8] &= ~(1 << (id % 8));
555 static unsigned long ieee80211_tids_for_ac(int ac)
557 /* If we ever support TIDs > 7, this obviously needs to be adjusted */
559 case IEEE80211_AC_VO:
560 return BIT(6) | BIT(7);
561 case IEEE80211_AC_VI:
562 return BIT(4) | BIT(5);
563 case IEEE80211_AC_BE:
564 return BIT(0) | BIT(3);
565 case IEEE80211_AC_BK:
566 return BIT(1) | BIT(2);
573 void sta_info_recalc_tim(struct sta_info *sta)
575 struct ieee80211_local *local = sta->local;
578 bool indicate_tim = false;
579 u8 ignore_for_tim = sta->sta.uapsd_queues;
583 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
584 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
585 if (WARN_ON_ONCE(!sta->sdata->bss))
588 ps = &sta->sdata->bss->ps;
594 /* No need to do anything if the driver does all */
595 if (local->hw.flags & IEEE80211_HW_AP_LINK_PS)
602 * If all ACs are delivery-enabled then we should build
603 * the TIM bit for all ACs anyway; if only some are then
604 * we ignore those and build the TIM bit using only the
607 if (ignore_for_tim == BIT(IEEE80211_NUM_ACS) - 1)
610 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
613 if (ignore_for_tim & BIT(ac))
616 indicate_tim |= !skb_queue_empty(&sta->tx_filtered[ac]) ||
617 !skb_queue_empty(&sta->ps_tx_buf[ac]);
621 tids = ieee80211_tids_for_ac(ac);
624 sta->driver_buffered_tids & tids;
628 spin_lock_irqsave(&local->tim_lock, flags);
631 __bss_tim_set(ps->tim, id);
633 __bss_tim_clear(ps->tim, id);
635 if (local->ops->set_tim) {
636 local->tim_in_locked_section = true;
637 drv_set_tim(local, &sta->sta, indicate_tim);
638 local->tim_in_locked_section = false;
641 spin_unlock_irqrestore(&local->tim_lock, flags);
644 static bool sta_info_buffer_expired(struct sta_info *sta, struct sk_buff *skb)
646 struct ieee80211_tx_info *info;
652 info = IEEE80211_SKB_CB(skb);
654 /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
655 timeout = (sta->listen_interval *
656 sta->sdata->vif.bss_conf.beacon_int *
658 if (timeout < STA_TX_BUFFER_EXPIRE)
659 timeout = STA_TX_BUFFER_EXPIRE;
660 return time_after(jiffies, info->control.jiffies + timeout);
664 static bool sta_info_cleanup_expire_buffered_ac(struct ieee80211_local *local,
665 struct sta_info *sta, int ac)
671 * First check for frames that should expire on the filtered
672 * queue. Frames here were rejected by the driver and are on
673 * a separate queue to avoid reordering with normal PS-buffered
674 * frames. They also aren't accounted for right now in the
675 * total_ps_buffered counter.
678 spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
679 skb = skb_peek(&sta->tx_filtered[ac]);
680 if (sta_info_buffer_expired(sta, skb))
681 skb = __skb_dequeue(&sta->tx_filtered[ac]);
684 spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
687 * Frames are queued in order, so if this one
688 * hasn't expired yet we can stop testing. If
689 * we actually reached the end of the queue we
690 * also need to stop, of course.
694 ieee80211_free_txskb(&local->hw, skb);
698 * Now also check the normal PS-buffered queue, this will
699 * only find something if the filtered queue was emptied
700 * since the filtered frames are all before the normal PS
704 spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
705 skb = skb_peek(&sta->ps_tx_buf[ac]);
706 if (sta_info_buffer_expired(sta, skb))
707 skb = __skb_dequeue(&sta->ps_tx_buf[ac]);
710 spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
713 * frames are queued in order, so if this one
714 * hasn't expired yet (or we reached the end of
715 * the queue) we can stop testing
720 local->total_ps_buffered--;
721 ps_dbg(sta->sdata, "Buffered frame expired (STA %pM)\n",
723 ieee80211_free_txskb(&local->hw, skb);
727 * Finally, recalculate the TIM bit for this station -- it might
728 * now be clear because the station was too slow to retrieve its
731 sta_info_recalc_tim(sta);
734 * Return whether there are any frames still buffered, this is
735 * used to check whether the cleanup timer still needs to run,
736 * if there are no frames we don't need to rearm the timer.
738 return !(skb_queue_empty(&sta->ps_tx_buf[ac]) &&
739 skb_queue_empty(&sta->tx_filtered[ac]));
742 static bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
743 struct sta_info *sta)
745 bool have_buffered = false;
748 /* This is only necessary for stations on BSS interfaces */
749 if (!sta->sdata->bss)
752 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
754 sta_info_cleanup_expire_buffered_ac(local, sta, ac);
756 return have_buffered;
759 int __must_check __sta_info_destroy(struct sta_info *sta)
761 struct ieee80211_local *local;
762 struct ieee80211_sub_if_data *sdata;
773 lockdep_assert_held(&local->sta_mtx);
776 * Before removing the station from the driver and
777 * rate control, it might still start new aggregation
778 * sessions -- block that to make sure the tear-down
779 * will be sufficient.
781 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
782 ieee80211_sta_tear_down_BA_sessions(sta, AGG_STOP_DESTROY_STA);
784 ret = sta_info_hash_del(local, sta);
788 list_del_rcu(&sta->list);
790 mutex_lock(&local->key_mtx);
791 for (i = 0; i < NUM_DEFAULT_KEYS; i++)
792 __ieee80211_key_free(key_mtx_dereference(local, sta->gtk[i]));
794 __ieee80211_key_free(key_mtx_dereference(local, sta->ptk));
795 mutex_unlock(&local->key_mtx);
800 local->sta_generation++;
802 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
803 RCU_INIT_POINTER(sdata->u.vlan.sta, NULL);
805 while (sta->sta_state > IEEE80211_STA_NONE) {
806 ret = sta_info_move_state(sta, sta->sta_state - 1);
814 ret = drv_sta_state(local, sdata, sta, IEEE80211_STA_NONE,
815 IEEE80211_STA_NOTEXIST);
816 WARN_ON_ONCE(ret != 0);
819 sta_dbg(sdata, "Removed STA %pM\n", sta->sta.addr);
821 cfg80211_del_sta(sdata->dev, sta->sta.addr, GFP_KERNEL);
823 rate_control_remove_sta_debugfs(sta);
824 ieee80211_sta_debugfs_remove(sta);
826 call_rcu(&sta->rcu_head, free_sta_rcu);
831 int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, const u8 *addr)
833 struct sta_info *sta;
836 mutex_lock(&sdata->local->sta_mtx);
837 sta = sta_info_get(sdata, addr);
838 ret = __sta_info_destroy(sta);
839 mutex_unlock(&sdata->local->sta_mtx);
844 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
847 struct sta_info *sta;
850 mutex_lock(&sdata->local->sta_mtx);
851 sta = sta_info_get_bss(sdata, addr);
852 ret = __sta_info_destroy(sta);
853 mutex_unlock(&sdata->local->sta_mtx);
858 static void sta_info_cleanup(unsigned long data)
860 struct ieee80211_local *local = (struct ieee80211_local *) data;
861 struct sta_info *sta;
862 bool timer_needed = false;
865 list_for_each_entry_rcu(sta, &local->sta_list, list)
866 if (sta_info_cleanup_expire_buffered(local, sta))
870 if (local->quiescing)
876 mod_timer(&local->sta_cleanup,
877 round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL));
880 void sta_info_init(struct ieee80211_local *local)
882 spin_lock_init(&local->tim_lock);
883 mutex_init(&local->sta_mtx);
884 INIT_LIST_HEAD(&local->sta_list);
886 setup_timer(&local->sta_cleanup, sta_info_cleanup,
887 (unsigned long)local);
890 void sta_info_stop(struct ieee80211_local *local)
892 del_timer_sync(&local->sta_cleanup);
896 int sta_info_flush_defer(struct ieee80211_sub_if_data *sdata)
898 struct ieee80211_local *local = sdata->local;
899 struct sta_info *sta, *tmp;
904 mutex_lock(&local->sta_mtx);
905 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
906 if (sdata == sta->sdata) {
907 WARN_ON(__sta_info_destroy(sta));
911 mutex_unlock(&local->sta_mtx);
916 void sta_info_flush_cleanup(struct ieee80211_sub_if_data *sdata)
918 ieee80211_cleanup_sdata_stas(sdata);
919 cancel_work_sync(&sdata->cleanup_stations_wk);
922 void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
923 unsigned long exp_time)
925 struct ieee80211_local *local = sdata->local;
926 struct sta_info *sta, *tmp;
928 mutex_lock(&local->sta_mtx);
930 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
931 if (sdata != sta->sdata)
934 if (time_after(jiffies, sta->last_rx + exp_time)) {
935 sta_dbg(sta->sdata, "expiring inactive STA %pM\n",
937 WARN_ON(__sta_info_destroy(sta));
941 mutex_unlock(&local->sta_mtx);
944 struct ieee80211_sta *ieee80211_find_sta_by_ifaddr(struct ieee80211_hw *hw,
948 struct sta_info *sta, *nxt;
951 * Just return a random station if localaddr is NULL
954 for_each_sta_info(hw_to_local(hw), addr, sta, nxt) {
956 !ether_addr_equal(sta->sdata->vif.addr, localaddr))
965 EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr);
967 struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif,
970 struct sta_info *sta;
975 sta = sta_info_get_bss(vif_to_sdata(vif), addr);
984 EXPORT_SYMBOL(ieee80211_find_sta);
986 static void clear_sta_ps_flags(void *_sta)
988 struct sta_info *sta = _sta;
989 struct ieee80211_sub_if_data *sdata = sta->sdata;
992 if (sdata->vif.type == NL80211_IFTYPE_AP ||
993 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
994 ps = &sdata->bss->ps;
998 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
999 if (test_and_clear_sta_flag(sta, WLAN_STA_PS_STA))
1000 atomic_dec(&ps->num_sta_ps);
1003 /* powersave support code */
1004 void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta)
1006 struct ieee80211_sub_if_data *sdata = sta->sdata;
1007 struct ieee80211_local *local = sdata->local;
1008 struct sk_buff_head pending;
1009 int filtered = 0, buffered = 0, ac;
1010 unsigned long flags;
1012 clear_sta_flag(sta, WLAN_STA_SP);
1014 BUILD_BUG_ON(BITS_TO_LONGS(IEEE80211_NUM_TIDS) > 1);
1015 sta->driver_buffered_tids = 0;
1017 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1018 drv_sta_notify(local, sdata, STA_NOTIFY_AWAKE, &sta->sta);
1020 skb_queue_head_init(&pending);
1022 /* Send all buffered frames to the station */
1023 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1024 int count = skb_queue_len(&pending), tmp;
1026 spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
1027 skb_queue_splice_tail_init(&sta->tx_filtered[ac], &pending);
1028 spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
1029 tmp = skb_queue_len(&pending);
1030 filtered += tmp - count;
1033 spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
1034 skb_queue_splice_tail_init(&sta->ps_tx_buf[ac], &pending);
1035 spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
1036 tmp = skb_queue_len(&pending);
1037 buffered += tmp - count;
1040 ieee80211_add_pending_skbs_fn(local, &pending, clear_sta_ps_flags, sta);
1042 local->total_ps_buffered -= buffered;
1044 sta_info_recalc_tim(sta);
1047 "STA %pM aid %d sending %d filtered/%d PS frames since STA not sleeping anymore\n",
1048 sta->sta.addr, sta->sta.aid, filtered, buffered);
1051 static void ieee80211_send_null_response(struct ieee80211_sub_if_data *sdata,
1052 struct sta_info *sta, int tid,
1053 enum ieee80211_frame_release_type reason)
1055 struct ieee80211_local *local = sdata->local;
1056 struct ieee80211_qos_hdr *nullfunc;
1057 struct sk_buff *skb;
1058 int size = sizeof(*nullfunc);
1060 bool qos = test_sta_flag(sta, WLAN_STA_WME);
1061 struct ieee80211_tx_info *info;
1062 struct ieee80211_chanctx_conf *chanctx_conf;
1065 fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1066 IEEE80211_STYPE_QOS_NULLFUNC |
1067 IEEE80211_FCTL_FROMDS);
1070 fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1071 IEEE80211_STYPE_NULLFUNC |
1072 IEEE80211_FCTL_FROMDS);
1075 skb = dev_alloc_skb(local->hw.extra_tx_headroom + size);
1079 skb_reserve(skb, local->hw.extra_tx_headroom);
1081 nullfunc = (void *) skb_put(skb, size);
1082 nullfunc->frame_control = fc;
1083 nullfunc->duration_id = 0;
1084 memcpy(nullfunc->addr1, sta->sta.addr, ETH_ALEN);
1085 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
1086 memcpy(nullfunc->addr3, sdata->vif.addr, ETH_ALEN);
1088 skb->priority = tid;
1089 skb_set_queue_mapping(skb, ieee802_1d_to_ac[tid]);
1091 nullfunc->qos_ctrl = cpu_to_le16(tid);
1093 if (reason == IEEE80211_FRAME_RELEASE_UAPSD)
1094 nullfunc->qos_ctrl |=
1095 cpu_to_le16(IEEE80211_QOS_CTL_EOSP);
1098 info = IEEE80211_SKB_CB(skb);
1101 * Tell TX path to send this frame even though the
1102 * STA may still remain is PS mode after this frame
1103 * exchange. Also set EOSP to indicate this packet
1104 * ends the poll/service period.
1106 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER |
1107 IEEE80211_TX_STATUS_EOSP |
1108 IEEE80211_TX_CTL_REQ_TX_STATUS;
1110 drv_allow_buffered_frames(local, sta, BIT(tid), 1, reason, false);
1113 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1114 if (WARN_ON(!chanctx_conf)) {
1120 ieee80211_xmit(sdata, skb, chanctx_conf->def.chan->band);
1125 ieee80211_sta_ps_deliver_response(struct sta_info *sta,
1126 int n_frames, u8 ignored_acs,
1127 enum ieee80211_frame_release_type reason)
1129 struct ieee80211_sub_if_data *sdata = sta->sdata;
1130 struct ieee80211_local *local = sdata->local;
1132 bool more_data = false;
1134 unsigned long driver_release_tids = 0;
1135 struct sk_buff_head frames;
1137 /* Service or PS-Poll period starts */
1138 set_sta_flag(sta, WLAN_STA_SP);
1140 __skb_queue_head_init(&frames);
1143 * Get response frame(s) and more data bit for it.
1145 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1148 if (ignored_acs & BIT(ac))
1151 tids = ieee80211_tids_for_ac(ac);
1154 driver_release_tids = sta->driver_buffered_tids & tids;
1155 if (driver_release_tids) {
1158 struct sk_buff *skb;
1160 while (n_frames > 0) {
1161 skb = skb_dequeue(&sta->tx_filtered[ac]);
1164 &sta->ps_tx_buf[ac]);
1166 local->total_ps_buffered--;
1172 __skb_queue_tail(&frames, skb);
1177 * If the driver has data on more than one TID then
1178 * certainly there's more data if we release just a
1179 * single frame now (from a single TID).
1181 if (reason == IEEE80211_FRAME_RELEASE_PSPOLL &&
1182 hweight16(driver_release_tids) > 1) {
1184 driver_release_tids =
1185 BIT(ffs(driver_release_tids) - 1);
1190 if (!skb_queue_empty(&sta->tx_filtered[ac]) ||
1191 !skb_queue_empty(&sta->ps_tx_buf[ac])) {
1201 * For PS-Poll, this can only happen due to a race condition
1202 * when we set the TIM bit and the station notices it, but
1203 * before it can poll for the frame we expire it.
1205 * For uAPSD, this is said in the standard (11.2.1.5 h):
1206 * At each unscheduled SP for a non-AP STA, the AP shall
1207 * attempt to transmit at least one MSDU or MMPDU, but no
1208 * more than the value specified in the Max SP Length field
1209 * in the QoS Capability element from delivery-enabled ACs,
1210 * that are destined for the non-AP STA.
1212 * Since we have no other MSDU/MMPDU, transmit a QoS null frame.
1215 /* This will evaluate to 1, 3, 5 or 7. */
1216 tid = 7 - ((ffs(~ignored_acs) - 1) << 1);
1218 ieee80211_send_null_response(sdata, sta, tid, reason);
1222 if (!driver_release_tids) {
1223 struct sk_buff_head pending;
1224 struct sk_buff *skb;
1228 skb_queue_head_init(&pending);
1230 while ((skb = __skb_dequeue(&frames))) {
1231 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1232 struct ieee80211_hdr *hdr = (void *) skb->data;
1238 * Tell TX path to send this frame even though the
1239 * STA may still remain is PS mode after this frame
1242 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
1245 * Use MoreData flag to indicate whether there are
1246 * more buffered frames for this STA
1248 if (more_data || !skb_queue_empty(&frames))
1249 hdr->frame_control |=
1250 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1252 hdr->frame_control &=
1253 cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
1255 if (ieee80211_is_data_qos(hdr->frame_control) ||
1256 ieee80211_is_qos_nullfunc(hdr->frame_control))
1257 qoshdr = ieee80211_get_qos_ctl(hdr);
1259 /* end service period after last frame */
1260 if (skb_queue_empty(&frames)) {
1261 if (reason == IEEE80211_FRAME_RELEASE_UAPSD &&
1263 *qoshdr |= IEEE80211_QOS_CTL_EOSP;
1265 info->flags |= IEEE80211_TX_STATUS_EOSP |
1266 IEEE80211_TX_CTL_REQ_TX_STATUS;
1270 tids |= BIT(*qoshdr & IEEE80211_QOS_CTL_TID_MASK);
1274 __skb_queue_tail(&pending, skb);
1277 drv_allow_buffered_frames(local, sta, tids, num,
1280 ieee80211_add_pending_skbs(local, &pending);
1282 sta_info_recalc_tim(sta);
1285 * We need to release a frame that is buffered somewhere in the
1286 * driver ... it'll have to handle that.
1287 * Note that, as per the comment above, it'll also have to see
1288 * if there is more than just one frame on the specific TID that
1289 * we're releasing from, and it needs to set the more-data bit
1290 * accordingly if we tell it that there's no more data. If we do
1291 * tell it there's more data, then of course the more-data bit
1292 * needs to be set anyway.
1294 drv_release_buffered_frames(local, sta, driver_release_tids,
1295 n_frames, reason, more_data);
1298 * Note that we don't recalculate the TIM bit here as it would
1299 * most likely have no effect at all unless the driver told us
1300 * that the TID became empty before returning here from the
1302 * Either way, however, when the driver tells us that the TID
1303 * became empty we'll do the TIM recalculation.
1308 void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta)
1310 u8 ignore_for_response = sta->sta.uapsd_queues;
1313 * If all ACs are delivery-enabled then we should reply
1314 * from any of them, if only some are enabled we reply
1315 * only from the non-enabled ones.
1317 if (ignore_for_response == BIT(IEEE80211_NUM_ACS) - 1)
1318 ignore_for_response = 0;
1320 ieee80211_sta_ps_deliver_response(sta, 1, ignore_for_response,
1321 IEEE80211_FRAME_RELEASE_PSPOLL);
1324 void ieee80211_sta_ps_deliver_uapsd(struct sta_info *sta)
1326 int n_frames = sta->sta.max_sp;
1327 u8 delivery_enabled = sta->sta.uapsd_queues;
1330 * If we ever grow support for TSPEC this might happen if
1331 * the TSPEC update from hostapd comes in between a trigger
1332 * frame setting WLAN_STA_UAPSD in the RX path and this
1333 * actually getting called.
1335 if (!delivery_enabled)
1338 switch (sta->sta.max_sp) {
1349 /* XXX: what is a good value? */
1354 ieee80211_sta_ps_deliver_response(sta, n_frames, ~delivery_enabled,
1355 IEEE80211_FRAME_RELEASE_UAPSD);
1358 void ieee80211_sta_block_awake(struct ieee80211_hw *hw,
1359 struct ieee80211_sta *pubsta, bool block)
1361 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1363 trace_api_sta_block_awake(sta->local, pubsta, block);
1366 set_sta_flag(sta, WLAN_STA_PS_DRIVER);
1367 else if (test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1368 ieee80211_queue_work(hw, &sta->drv_unblock_wk);
1370 EXPORT_SYMBOL(ieee80211_sta_block_awake);
1372 void ieee80211_sta_eosp_irqsafe(struct ieee80211_sta *pubsta)
1374 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1375 struct ieee80211_local *local = sta->local;
1376 struct sk_buff *skb;
1377 struct skb_eosp_msg_data *data;
1379 trace_api_eosp(local, pubsta);
1381 skb = alloc_skb(0, GFP_ATOMIC);
1383 /* too bad ... but race is better than loss */
1384 clear_sta_flag(sta, WLAN_STA_SP);
1388 data = (void *)skb->cb;
1389 memcpy(data->sta, pubsta->addr, ETH_ALEN);
1390 memcpy(data->iface, sta->sdata->vif.addr, ETH_ALEN);
1391 skb->pkt_type = IEEE80211_EOSP_MSG;
1392 skb_queue_tail(&local->skb_queue, skb);
1393 tasklet_schedule(&local->tasklet);
1395 EXPORT_SYMBOL(ieee80211_sta_eosp_irqsafe);
1397 void ieee80211_sta_set_buffered(struct ieee80211_sta *pubsta,
1398 u8 tid, bool buffered)
1400 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1402 if (WARN_ON(tid >= IEEE80211_NUM_TIDS))
1406 set_bit(tid, &sta->driver_buffered_tids);
1408 clear_bit(tid, &sta->driver_buffered_tids);
1410 sta_info_recalc_tim(sta);
1412 EXPORT_SYMBOL(ieee80211_sta_set_buffered);
1414 int sta_info_move_state(struct sta_info *sta,
1415 enum ieee80211_sta_state new_state)
1419 if (sta->sta_state == new_state)
1422 /* check allowed transitions first */
1424 switch (new_state) {
1425 case IEEE80211_STA_NONE:
1426 if (sta->sta_state != IEEE80211_STA_AUTH)
1429 case IEEE80211_STA_AUTH:
1430 if (sta->sta_state != IEEE80211_STA_NONE &&
1431 sta->sta_state != IEEE80211_STA_ASSOC)
1434 case IEEE80211_STA_ASSOC:
1435 if (sta->sta_state != IEEE80211_STA_AUTH &&
1436 sta->sta_state != IEEE80211_STA_AUTHORIZED)
1439 case IEEE80211_STA_AUTHORIZED:
1440 if (sta->sta_state != IEEE80211_STA_ASSOC)
1444 WARN(1, "invalid state %d", new_state);
1448 sta_dbg(sta->sdata, "moving STA %pM to state %d\n",
1449 sta->sta.addr, new_state);
1452 * notify the driver before the actual changes so it can
1453 * fail the transition
1455 if (test_sta_flag(sta, WLAN_STA_INSERTED)) {
1456 int err = drv_sta_state(sta->local, sta->sdata, sta,
1457 sta->sta_state, new_state);
1462 /* reflect the change in all state variables */
1464 switch (new_state) {
1465 case IEEE80211_STA_NONE:
1466 if (sta->sta_state == IEEE80211_STA_AUTH)
1467 clear_bit(WLAN_STA_AUTH, &sta->_flags);
1469 case IEEE80211_STA_AUTH:
1470 if (sta->sta_state == IEEE80211_STA_NONE)
1471 set_bit(WLAN_STA_AUTH, &sta->_flags);
1472 else if (sta->sta_state == IEEE80211_STA_ASSOC)
1473 clear_bit(WLAN_STA_ASSOC, &sta->_flags);
1475 case IEEE80211_STA_ASSOC:
1476 if (sta->sta_state == IEEE80211_STA_AUTH) {
1477 set_bit(WLAN_STA_ASSOC, &sta->_flags);
1478 } else if (sta->sta_state == IEEE80211_STA_AUTHORIZED) {
1479 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1480 (sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1481 !sta->sdata->u.vlan.sta))
1482 atomic_dec(&sta->sdata->bss->num_mcast_sta);
1483 clear_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
1486 case IEEE80211_STA_AUTHORIZED:
1487 if (sta->sta_state == IEEE80211_STA_ASSOC) {
1488 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1489 (sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1490 !sta->sdata->u.vlan.sta))
1491 atomic_inc(&sta->sdata->bss->num_mcast_sta);
1492 set_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
1499 sta->sta_state = new_state;