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);
383 #ifdef CONFIG_MAC80211_MESH
384 sta->plink_state = NL80211_PLINK_LISTEN;
385 init_timer(&sta->plink_timer);
391 static int sta_info_insert_check(struct sta_info *sta)
393 struct ieee80211_sub_if_data *sdata = sta->sdata;
396 * Can't be a WARN_ON because it can be triggered through a race:
397 * something inserts a STA (on one CPU) without holding the RTNL
398 * and another CPU turns off the net device.
400 if (unlikely(!ieee80211_sdata_running(sdata)))
403 if (WARN_ON(ether_addr_equal(sta->sta.addr, sdata->vif.addr) ||
404 is_multicast_ether_addr(sta->sta.addr)))
410 static int sta_info_insert_drv_state(struct ieee80211_local *local,
411 struct ieee80211_sub_if_data *sdata,
412 struct sta_info *sta)
414 enum ieee80211_sta_state state;
417 for (state = IEEE80211_STA_NOTEXIST; state < sta->sta_state; state++) {
418 err = drv_sta_state(local, sdata, sta, state, state + 1);
425 * Drivers using legacy sta_add/sta_remove callbacks only
426 * get uploaded set to true after sta_add is called.
428 if (!local->ops->sta_add)
429 sta->uploaded = true;
433 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
435 "failed to move IBSS STA %pM to state %d (%d) - keeping it anyway\n",
436 sta->sta.addr, state + 1, err);
440 /* unwind on error */
441 for (; state > IEEE80211_STA_NOTEXIST; state--)
442 WARN_ON(drv_sta_state(local, sdata, sta, state, state - 1));
448 * should be called with sta_mtx locked
449 * this function replaces the mutex lock
452 static int sta_info_insert_finish(struct sta_info *sta) __acquires(RCU)
454 struct ieee80211_local *local = sta->local;
455 struct ieee80211_sub_if_data *sdata = sta->sdata;
456 struct station_info sinfo;
459 lockdep_assert_held(&local->sta_mtx);
461 /* check if STA exists already */
462 if (sta_info_get_bss(sdata, sta->sta.addr)) {
468 err = sta_info_insert_drv_state(local, sdata, sta);
473 local->sta_generation++;
476 /* make the station visible */
477 sta_info_hash_add(local, sta);
479 list_add_rcu(&sta->list, &local->sta_list);
481 set_sta_flag(sta, WLAN_STA_INSERTED);
483 ieee80211_sta_debugfs_add(sta);
484 rate_control_add_sta_debugfs(sta);
486 memset(&sinfo, 0, sizeof(sinfo));
488 sinfo.generation = local->sta_generation;
489 cfg80211_new_sta(sdata->dev, sta->sta.addr, &sinfo, GFP_KERNEL);
491 sta_dbg(sdata, "Inserted STA %pM\n", sta->sta.addr);
493 /* move reference to rcu-protected */
495 mutex_unlock(&local->sta_mtx);
497 if (ieee80211_vif_is_mesh(&sdata->vif))
498 mesh_accept_plinks_update(sdata);
502 mutex_unlock(&local->sta_mtx);
507 int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU)
509 struct ieee80211_local *local = sta->local;
514 err = sta_info_insert_check(sta);
520 mutex_lock(&local->sta_mtx);
522 err = sta_info_insert_finish(sta);
529 sta_info_free(local, sta);
533 int sta_info_insert(struct sta_info *sta)
535 int err = sta_info_insert_rcu(sta);
542 static inline void __bss_tim_set(u8 *tim, u16 id)
545 * This format has been mandated by the IEEE specifications,
546 * so this line may not be changed to use the __set_bit() format.
548 tim[id / 8] |= (1 << (id % 8));
551 static inline void __bss_tim_clear(u8 *tim, u16 id)
554 * This format has been mandated by the IEEE specifications,
555 * so this line may not be changed to use the __clear_bit() format.
557 tim[id / 8] &= ~(1 << (id % 8));
560 static unsigned long ieee80211_tids_for_ac(int ac)
562 /* If we ever support TIDs > 7, this obviously needs to be adjusted */
564 case IEEE80211_AC_VO:
565 return BIT(6) | BIT(7);
566 case IEEE80211_AC_VI:
567 return BIT(4) | BIT(5);
568 case IEEE80211_AC_BE:
569 return BIT(0) | BIT(3);
570 case IEEE80211_AC_BK:
571 return BIT(1) | BIT(2);
578 void sta_info_recalc_tim(struct sta_info *sta)
580 struct ieee80211_local *local = sta->local;
583 bool indicate_tim = false;
584 u8 ignore_for_tim = sta->sta.uapsd_queues;
588 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
589 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
590 if (WARN_ON_ONCE(!sta->sdata->bss))
593 ps = &sta->sdata->bss->ps;
599 /* No need to do anything if the driver does all */
600 if (local->hw.flags & IEEE80211_HW_AP_LINK_PS)
607 * If all ACs are delivery-enabled then we should build
608 * the TIM bit for all ACs anyway; if only some are then
609 * we ignore those and build the TIM bit using only the
612 if (ignore_for_tim == BIT(IEEE80211_NUM_ACS) - 1)
615 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
618 if (ignore_for_tim & BIT(ac))
621 indicate_tim |= !skb_queue_empty(&sta->tx_filtered[ac]) ||
622 !skb_queue_empty(&sta->ps_tx_buf[ac]);
626 tids = ieee80211_tids_for_ac(ac);
629 sta->driver_buffered_tids & tids;
633 spin_lock_irqsave(&local->tim_lock, flags);
636 __bss_tim_set(ps->tim, id);
638 __bss_tim_clear(ps->tim, id);
640 if (local->ops->set_tim) {
641 local->tim_in_locked_section = true;
642 drv_set_tim(local, &sta->sta, indicate_tim);
643 local->tim_in_locked_section = false;
646 spin_unlock_irqrestore(&local->tim_lock, flags);
649 static bool sta_info_buffer_expired(struct sta_info *sta, struct sk_buff *skb)
651 struct ieee80211_tx_info *info;
657 info = IEEE80211_SKB_CB(skb);
659 /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
660 timeout = (sta->listen_interval *
661 sta->sdata->vif.bss_conf.beacon_int *
663 if (timeout < STA_TX_BUFFER_EXPIRE)
664 timeout = STA_TX_BUFFER_EXPIRE;
665 return time_after(jiffies, info->control.jiffies + timeout);
669 static bool sta_info_cleanup_expire_buffered_ac(struct ieee80211_local *local,
670 struct sta_info *sta, int ac)
676 * First check for frames that should expire on the filtered
677 * queue. Frames here were rejected by the driver and are on
678 * a separate queue to avoid reordering with normal PS-buffered
679 * frames. They also aren't accounted for right now in the
680 * total_ps_buffered counter.
683 spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
684 skb = skb_peek(&sta->tx_filtered[ac]);
685 if (sta_info_buffer_expired(sta, skb))
686 skb = __skb_dequeue(&sta->tx_filtered[ac]);
689 spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
692 * Frames are queued in order, so if this one
693 * hasn't expired yet we can stop testing. If
694 * we actually reached the end of the queue we
695 * also need to stop, of course.
699 ieee80211_free_txskb(&local->hw, skb);
703 * Now also check the normal PS-buffered queue, this will
704 * only find something if the filtered queue was emptied
705 * since the filtered frames are all before the normal PS
709 spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
710 skb = skb_peek(&sta->ps_tx_buf[ac]);
711 if (sta_info_buffer_expired(sta, skb))
712 skb = __skb_dequeue(&sta->ps_tx_buf[ac]);
715 spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
718 * frames are queued in order, so if this one
719 * hasn't expired yet (or we reached the end of
720 * the queue) we can stop testing
725 local->total_ps_buffered--;
726 ps_dbg(sta->sdata, "Buffered frame expired (STA %pM)\n",
728 ieee80211_free_txskb(&local->hw, skb);
732 * Finally, recalculate the TIM bit for this station -- it might
733 * now be clear because the station was too slow to retrieve its
736 sta_info_recalc_tim(sta);
739 * Return whether there are any frames still buffered, this is
740 * used to check whether the cleanup timer still needs to run,
741 * if there are no frames we don't need to rearm the timer.
743 return !(skb_queue_empty(&sta->ps_tx_buf[ac]) &&
744 skb_queue_empty(&sta->tx_filtered[ac]));
747 static bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
748 struct sta_info *sta)
750 bool have_buffered = false;
753 /* This is only necessary for stations on BSS interfaces */
754 if (!sta->sdata->bss)
757 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
759 sta_info_cleanup_expire_buffered_ac(local, sta, ac);
761 return have_buffered;
764 int __must_check __sta_info_destroy(struct sta_info *sta)
766 struct ieee80211_local *local;
767 struct ieee80211_sub_if_data *sdata;
778 lockdep_assert_held(&local->sta_mtx);
781 * Before removing the station from the driver and
782 * rate control, it might still start new aggregation
783 * sessions -- block that to make sure the tear-down
784 * will be sufficient.
786 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
787 ieee80211_sta_tear_down_BA_sessions(sta, AGG_STOP_DESTROY_STA);
789 ret = sta_info_hash_del(local, sta);
793 list_del_rcu(&sta->list);
795 mutex_lock(&local->key_mtx);
796 for (i = 0; i < NUM_DEFAULT_KEYS; i++)
797 __ieee80211_key_free(key_mtx_dereference(local, sta->gtk[i]));
799 __ieee80211_key_free(key_mtx_dereference(local, sta->ptk));
800 mutex_unlock(&local->key_mtx);
805 local->sta_generation++;
807 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
808 RCU_INIT_POINTER(sdata->u.vlan.sta, NULL);
810 while (sta->sta_state > IEEE80211_STA_NONE) {
811 ret = sta_info_move_state(sta, sta->sta_state - 1);
819 ret = drv_sta_state(local, sdata, sta, IEEE80211_STA_NONE,
820 IEEE80211_STA_NOTEXIST);
821 WARN_ON_ONCE(ret != 0);
824 sta_dbg(sdata, "Removed STA %pM\n", sta->sta.addr);
826 cfg80211_del_sta(sdata->dev, sta->sta.addr, GFP_KERNEL);
828 rate_control_remove_sta_debugfs(sta);
829 ieee80211_sta_debugfs_remove(sta);
831 call_rcu(&sta->rcu_head, free_sta_rcu);
836 int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, const u8 *addr)
838 struct sta_info *sta;
841 mutex_lock(&sdata->local->sta_mtx);
842 sta = sta_info_get(sdata, addr);
843 ret = __sta_info_destroy(sta);
844 mutex_unlock(&sdata->local->sta_mtx);
849 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
852 struct sta_info *sta;
855 mutex_lock(&sdata->local->sta_mtx);
856 sta = sta_info_get_bss(sdata, addr);
857 ret = __sta_info_destroy(sta);
858 mutex_unlock(&sdata->local->sta_mtx);
863 static void sta_info_cleanup(unsigned long data)
865 struct ieee80211_local *local = (struct ieee80211_local *) data;
866 struct sta_info *sta;
867 bool timer_needed = false;
870 list_for_each_entry_rcu(sta, &local->sta_list, list)
871 if (sta_info_cleanup_expire_buffered(local, sta))
875 if (local->quiescing)
881 mod_timer(&local->sta_cleanup,
882 round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL));
885 void sta_info_init(struct ieee80211_local *local)
887 spin_lock_init(&local->tim_lock);
888 mutex_init(&local->sta_mtx);
889 INIT_LIST_HEAD(&local->sta_list);
891 setup_timer(&local->sta_cleanup, sta_info_cleanup,
892 (unsigned long)local);
895 void sta_info_stop(struct ieee80211_local *local)
897 del_timer_sync(&local->sta_cleanup);
901 int sta_info_flush_defer(struct ieee80211_sub_if_data *sdata)
903 struct ieee80211_local *local = sdata->local;
904 struct sta_info *sta, *tmp;
909 mutex_lock(&local->sta_mtx);
910 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
911 if (sdata == sta->sdata) {
912 WARN_ON(__sta_info_destroy(sta));
916 mutex_unlock(&local->sta_mtx);
921 void sta_info_flush_cleanup(struct ieee80211_sub_if_data *sdata)
923 ieee80211_cleanup_sdata_stas(sdata);
924 cancel_work_sync(&sdata->cleanup_stations_wk);
927 void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
928 unsigned long exp_time)
930 struct ieee80211_local *local = sdata->local;
931 struct sta_info *sta, *tmp;
933 mutex_lock(&local->sta_mtx);
935 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
936 if (sdata != sta->sdata)
939 if (time_after(jiffies, sta->last_rx + exp_time)) {
940 sta_dbg(sta->sdata, "expiring inactive STA %pM\n",
942 WARN_ON(__sta_info_destroy(sta));
946 mutex_unlock(&local->sta_mtx);
949 struct ieee80211_sta *ieee80211_find_sta_by_ifaddr(struct ieee80211_hw *hw,
953 struct sta_info *sta, *nxt;
956 * Just return a random station if localaddr is NULL
959 for_each_sta_info(hw_to_local(hw), addr, sta, nxt) {
961 !ether_addr_equal(sta->sdata->vif.addr, localaddr))
970 EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr);
972 struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif,
975 struct sta_info *sta;
980 sta = sta_info_get_bss(vif_to_sdata(vif), addr);
989 EXPORT_SYMBOL(ieee80211_find_sta);
991 static void clear_sta_ps_flags(void *_sta)
993 struct sta_info *sta = _sta;
994 struct ieee80211_sub_if_data *sdata = sta->sdata;
997 if (sdata->vif.type == NL80211_IFTYPE_AP ||
998 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
999 ps = &sdata->bss->ps;
1003 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
1004 if (test_and_clear_sta_flag(sta, WLAN_STA_PS_STA))
1005 atomic_dec(&ps->num_sta_ps);
1008 /* powersave support code */
1009 void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta)
1011 struct ieee80211_sub_if_data *sdata = sta->sdata;
1012 struct ieee80211_local *local = sdata->local;
1013 struct sk_buff_head pending;
1014 int filtered = 0, buffered = 0, ac;
1015 unsigned long flags;
1017 clear_sta_flag(sta, WLAN_STA_SP);
1019 BUILD_BUG_ON(BITS_TO_LONGS(IEEE80211_NUM_TIDS) > 1);
1020 sta->driver_buffered_tids = 0;
1022 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1023 drv_sta_notify(local, sdata, STA_NOTIFY_AWAKE, &sta->sta);
1025 skb_queue_head_init(&pending);
1027 /* Send all buffered frames to the station */
1028 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1029 int count = skb_queue_len(&pending), tmp;
1031 spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
1032 skb_queue_splice_tail_init(&sta->tx_filtered[ac], &pending);
1033 spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
1034 tmp = skb_queue_len(&pending);
1035 filtered += tmp - count;
1038 spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
1039 skb_queue_splice_tail_init(&sta->ps_tx_buf[ac], &pending);
1040 spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
1041 tmp = skb_queue_len(&pending);
1042 buffered += tmp - count;
1045 ieee80211_add_pending_skbs_fn(local, &pending, clear_sta_ps_flags, sta);
1047 local->total_ps_buffered -= buffered;
1049 sta_info_recalc_tim(sta);
1052 "STA %pM aid %d sending %d filtered/%d PS frames since STA not sleeping anymore\n",
1053 sta->sta.addr, sta->sta.aid, filtered, buffered);
1056 static void ieee80211_send_null_response(struct ieee80211_sub_if_data *sdata,
1057 struct sta_info *sta, int tid,
1058 enum ieee80211_frame_release_type reason)
1060 struct ieee80211_local *local = sdata->local;
1061 struct ieee80211_qos_hdr *nullfunc;
1062 struct sk_buff *skb;
1063 int size = sizeof(*nullfunc);
1065 bool qos = test_sta_flag(sta, WLAN_STA_WME);
1066 struct ieee80211_tx_info *info;
1067 struct ieee80211_chanctx_conf *chanctx_conf;
1070 fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1071 IEEE80211_STYPE_QOS_NULLFUNC |
1072 IEEE80211_FCTL_FROMDS);
1075 fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1076 IEEE80211_STYPE_NULLFUNC |
1077 IEEE80211_FCTL_FROMDS);
1080 skb = dev_alloc_skb(local->hw.extra_tx_headroom + size);
1084 skb_reserve(skb, local->hw.extra_tx_headroom);
1086 nullfunc = (void *) skb_put(skb, size);
1087 nullfunc->frame_control = fc;
1088 nullfunc->duration_id = 0;
1089 memcpy(nullfunc->addr1, sta->sta.addr, ETH_ALEN);
1090 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
1091 memcpy(nullfunc->addr3, sdata->vif.addr, ETH_ALEN);
1093 skb->priority = tid;
1094 skb_set_queue_mapping(skb, ieee802_1d_to_ac[tid]);
1096 nullfunc->qos_ctrl = cpu_to_le16(tid);
1098 if (reason == IEEE80211_FRAME_RELEASE_UAPSD)
1099 nullfunc->qos_ctrl |=
1100 cpu_to_le16(IEEE80211_QOS_CTL_EOSP);
1103 info = IEEE80211_SKB_CB(skb);
1106 * Tell TX path to send this frame even though the
1107 * STA may still remain is PS mode after this frame
1108 * exchange. Also set EOSP to indicate this packet
1109 * ends the poll/service period.
1111 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER |
1112 IEEE80211_TX_STATUS_EOSP |
1113 IEEE80211_TX_CTL_REQ_TX_STATUS;
1115 drv_allow_buffered_frames(local, sta, BIT(tid), 1, reason, false);
1118 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1119 if (WARN_ON(!chanctx_conf)) {
1125 ieee80211_xmit(sdata, skb, chanctx_conf->def.chan->band);
1130 ieee80211_sta_ps_deliver_response(struct sta_info *sta,
1131 int n_frames, u8 ignored_acs,
1132 enum ieee80211_frame_release_type reason)
1134 struct ieee80211_sub_if_data *sdata = sta->sdata;
1135 struct ieee80211_local *local = sdata->local;
1137 bool more_data = false;
1139 unsigned long driver_release_tids = 0;
1140 struct sk_buff_head frames;
1142 /* Service or PS-Poll period starts */
1143 set_sta_flag(sta, WLAN_STA_SP);
1145 __skb_queue_head_init(&frames);
1148 * Get response frame(s) and more data bit for it.
1150 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1153 if (ignored_acs & BIT(ac))
1156 tids = ieee80211_tids_for_ac(ac);
1159 driver_release_tids = sta->driver_buffered_tids & tids;
1160 if (driver_release_tids) {
1163 struct sk_buff *skb;
1165 while (n_frames > 0) {
1166 skb = skb_dequeue(&sta->tx_filtered[ac]);
1169 &sta->ps_tx_buf[ac]);
1171 local->total_ps_buffered--;
1177 __skb_queue_tail(&frames, skb);
1182 * If the driver has data on more than one TID then
1183 * certainly there's more data if we release just a
1184 * single frame now (from a single TID).
1186 if (reason == IEEE80211_FRAME_RELEASE_PSPOLL &&
1187 hweight16(driver_release_tids) > 1) {
1189 driver_release_tids =
1190 BIT(ffs(driver_release_tids) - 1);
1195 if (!skb_queue_empty(&sta->tx_filtered[ac]) ||
1196 !skb_queue_empty(&sta->ps_tx_buf[ac])) {
1206 * For PS-Poll, this can only happen due to a race condition
1207 * when we set the TIM bit and the station notices it, but
1208 * before it can poll for the frame we expire it.
1210 * For uAPSD, this is said in the standard (11.2.1.5 h):
1211 * At each unscheduled SP for a non-AP STA, the AP shall
1212 * attempt to transmit at least one MSDU or MMPDU, but no
1213 * more than the value specified in the Max SP Length field
1214 * in the QoS Capability element from delivery-enabled ACs,
1215 * that are destined for the non-AP STA.
1217 * Since we have no other MSDU/MMPDU, transmit a QoS null frame.
1220 /* This will evaluate to 1, 3, 5 or 7. */
1221 tid = 7 - ((ffs(~ignored_acs) - 1) << 1);
1223 ieee80211_send_null_response(sdata, sta, tid, reason);
1227 if (!driver_release_tids) {
1228 struct sk_buff_head pending;
1229 struct sk_buff *skb;
1233 skb_queue_head_init(&pending);
1235 while ((skb = __skb_dequeue(&frames))) {
1236 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1237 struct ieee80211_hdr *hdr = (void *) skb->data;
1243 * Tell TX path to send this frame even though the
1244 * STA may still remain is PS mode after this frame
1247 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
1250 * Use MoreData flag to indicate whether there are
1251 * more buffered frames for this STA
1253 if (more_data || !skb_queue_empty(&frames))
1254 hdr->frame_control |=
1255 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1257 hdr->frame_control &=
1258 cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
1260 if (ieee80211_is_data_qos(hdr->frame_control) ||
1261 ieee80211_is_qos_nullfunc(hdr->frame_control))
1262 qoshdr = ieee80211_get_qos_ctl(hdr);
1264 /* end service period after last frame */
1265 if (skb_queue_empty(&frames)) {
1266 if (reason == IEEE80211_FRAME_RELEASE_UAPSD &&
1268 *qoshdr |= IEEE80211_QOS_CTL_EOSP;
1270 info->flags |= IEEE80211_TX_STATUS_EOSP |
1271 IEEE80211_TX_CTL_REQ_TX_STATUS;
1275 tids |= BIT(*qoshdr & IEEE80211_QOS_CTL_TID_MASK);
1279 __skb_queue_tail(&pending, skb);
1282 drv_allow_buffered_frames(local, sta, tids, num,
1285 ieee80211_add_pending_skbs(local, &pending);
1287 sta_info_recalc_tim(sta);
1290 * We need to release a frame that is buffered somewhere in the
1291 * driver ... it'll have to handle that.
1292 * Note that, as per the comment above, it'll also have to see
1293 * if there is more than just one frame on the specific TID that
1294 * we're releasing from, and it needs to set the more-data bit
1295 * accordingly if we tell it that there's no more data. If we do
1296 * tell it there's more data, then of course the more-data bit
1297 * needs to be set anyway.
1299 drv_release_buffered_frames(local, sta, driver_release_tids,
1300 n_frames, reason, more_data);
1303 * Note that we don't recalculate the TIM bit here as it would
1304 * most likely have no effect at all unless the driver told us
1305 * that the TID became empty before returning here from the
1307 * Either way, however, when the driver tells us that the TID
1308 * became empty we'll do the TIM recalculation.
1313 void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta)
1315 u8 ignore_for_response = sta->sta.uapsd_queues;
1318 * If all ACs are delivery-enabled then we should reply
1319 * from any of them, if only some are enabled we reply
1320 * only from the non-enabled ones.
1322 if (ignore_for_response == BIT(IEEE80211_NUM_ACS) - 1)
1323 ignore_for_response = 0;
1325 ieee80211_sta_ps_deliver_response(sta, 1, ignore_for_response,
1326 IEEE80211_FRAME_RELEASE_PSPOLL);
1329 void ieee80211_sta_ps_deliver_uapsd(struct sta_info *sta)
1331 int n_frames = sta->sta.max_sp;
1332 u8 delivery_enabled = sta->sta.uapsd_queues;
1335 * If we ever grow support for TSPEC this might happen if
1336 * the TSPEC update from hostapd comes in between a trigger
1337 * frame setting WLAN_STA_UAPSD in the RX path and this
1338 * actually getting called.
1340 if (!delivery_enabled)
1343 switch (sta->sta.max_sp) {
1354 /* XXX: what is a good value? */
1359 ieee80211_sta_ps_deliver_response(sta, n_frames, ~delivery_enabled,
1360 IEEE80211_FRAME_RELEASE_UAPSD);
1363 void ieee80211_sta_block_awake(struct ieee80211_hw *hw,
1364 struct ieee80211_sta *pubsta, bool block)
1366 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1368 trace_api_sta_block_awake(sta->local, pubsta, block);
1371 set_sta_flag(sta, WLAN_STA_PS_DRIVER);
1372 else if (test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1373 ieee80211_queue_work(hw, &sta->drv_unblock_wk);
1375 EXPORT_SYMBOL(ieee80211_sta_block_awake);
1377 void ieee80211_sta_eosp_irqsafe(struct ieee80211_sta *pubsta)
1379 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1380 struct ieee80211_local *local = sta->local;
1381 struct sk_buff *skb;
1382 struct skb_eosp_msg_data *data;
1384 trace_api_eosp(local, pubsta);
1386 skb = alloc_skb(0, GFP_ATOMIC);
1388 /* too bad ... but race is better than loss */
1389 clear_sta_flag(sta, WLAN_STA_SP);
1393 data = (void *)skb->cb;
1394 memcpy(data->sta, pubsta->addr, ETH_ALEN);
1395 memcpy(data->iface, sta->sdata->vif.addr, ETH_ALEN);
1396 skb->pkt_type = IEEE80211_EOSP_MSG;
1397 skb_queue_tail(&local->skb_queue, skb);
1398 tasklet_schedule(&local->tasklet);
1400 EXPORT_SYMBOL(ieee80211_sta_eosp_irqsafe);
1402 void ieee80211_sta_set_buffered(struct ieee80211_sta *pubsta,
1403 u8 tid, bool buffered)
1405 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1407 if (WARN_ON(tid >= IEEE80211_NUM_TIDS))
1411 set_bit(tid, &sta->driver_buffered_tids);
1413 clear_bit(tid, &sta->driver_buffered_tids);
1415 sta_info_recalc_tim(sta);
1417 EXPORT_SYMBOL(ieee80211_sta_set_buffered);
1419 int sta_info_move_state(struct sta_info *sta,
1420 enum ieee80211_sta_state new_state)
1424 if (sta->sta_state == new_state)
1427 /* check allowed transitions first */
1429 switch (new_state) {
1430 case IEEE80211_STA_NONE:
1431 if (sta->sta_state != IEEE80211_STA_AUTH)
1434 case IEEE80211_STA_AUTH:
1435 if (sta->sta_state != IEEE80211_STA_NONE &&
1436 sta->sta_state != IEEE80211_STA_ASSOC)
1439 case IEEE80211_STA_ASSOC:
1440 if (sta->sta_state != IEEE80211_STA_AUTH &&
1441 sta->sta_state != IEEE80211_STA_AUTHORIZED)
1444 case IEEE80211_STA_AUTHORIZED:
1445 if (sta->sta_state != IEEE80211_STA_ASSOC)
1449 WARN(1, "invalid state %d", new_state);
1453 sta_dbg(sta->sdata, "moving STA %pM to state %d\n",
1454 sta->sta.addr, new_state);
1457 * notify the driver before the actual changes so it can
1458 * fail the transition
1460 if (test_sta_flag(sta, WLAN_STA_INSERTED)) {
1461 int err = drv_sta_state(sta->local, sta->sdata, sta,
1462 sta->sta_state, new_state);
1467 /* reflect the change in all state variables */
1469 switch (new_state) {
1470 case IEEE80211_STA_NONE:
1471 if (sta->sta_state == IEEE80211_STA_AUTH)
1472 clear_bit(WLAN_STA_AUTH, &sta->_flags);
1474 case IEEE80211_STA_AUTH:
1475 if (sta->sta_state == IEEE80211_STA_NONE)
1476 set_bit(WLAN_STA_AUTH, &sta->_flags);
1477 else if (sta->sta_state == IEEE80211_STA_ASSOC)
1478 clear_bit(WLAN_STA_ASSOC, &sta->_flags);
1480 case IEEE80211_STA_ASSOC:
1481 if (sta->sta_state == IEEE80211_STA_AUTH) {
1482 set_bit(WLAN_STA_ASSOC, &sta->_flags);
1483 } else if (sta->sta_state == IEEE80211_STA_AUTHORIZED) {
1484 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1485 (sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1486 !sta->sdata->u.vlan.sta))
1487 atomic_dec(&sta->sdata->bss->num_mcast_sta);
1488 clear_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
1491 case IEEE80211_STA_AUTHORIZED:
1492 if (sta->sta_state == IEEE80211_STA_ASSOC) {
1493 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1494 (sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1495 !sta->sdata->u.vlan.sta))
1496 atomic_inc(&sta->sdata->bss->num_mcast_sta);
1497 set_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
1504 sta->sta_state = new_state;