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.
109 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
110 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
111 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
112 ps = &sdata->bss->ps;
116 clear_sta_flag(sta, WLAN_STA_PS_STA);
118 atomic_dec(&ps->num_sta_ps);
119 sta_info_recalc_tim(sta);
122 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
123 local->total_ps_buffered -= skb_queue_len(&sta->ps_tx_buf[ac]);
124 ieee80211_purge_tx_queue(&local->hw, &sta->ps_tx_buf[ac]);
125 ieee80211_purge_tx_queue(&local->hw, &sta->tx_filtered[ac]);
128 #ifdef CONFIG_MAC80211_MESH
129 if (ieee80211_vif_is_mesh(&sdata->vif)) {
130 mesh_accept_plinks_update(sdata);
131 mesh_plink_deactivate(sta);
132 del_timer_sync(&sta->plink_timer);
136 cancel_work_sync(&sta->drv_unblock_wk);
139 * Destroy aggregation state here. It would be nice to wait for the
140 * driver to finish aggregation stop and then clean up, but for now
141 * drivers have to handle aggregation stop being requested, followed
142 * directly by station destruction.
144 for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
145 tid_tx = rcu_dereference_raw(sta->ampdu_mlme.tid_tx[i]);
148 ieee80211_purge_tx_queue(&local->hw, &tid_tx->pending);
152 sta_info_free(local, sta);
155 void ieee80211_cleanup_sdata_stas(struct ieee80211_sub_if_data *sdata)
157 struct sta_info *sta;
159 spin_lock_bh(&sdata->cleanup_stations_lock);
160 while (!list_empty(&sdata->cleanup_stations)) {
161 sta = list_first_entry(&sdata->cleanup_stations,
162 struct sta_info, list);
163 list_del(&sta->list);
164 spin_unlock_bh(&sdata->cleanup_stations_lock);
166 cleanup_single_sta(sta);
168 spin_lock_bh(&sdata->cleanup_stations_lock);
171 spin_unlock_bh(&sdata->cleanup_stations_lock);
174 static void free_sta_rcu(struct rcu_head *h)
176 struct sta_info *sta = container_of(h, struct sta_info, rcu_head);
177 struct ieee80211_sub_if_data *sdata = sta->sdata;
179 spin_lock(&sdata->cleanup_stations_lock);
180 list_add_tail(&sta->list, &sdata->cleanup_stations);
181 spin_unlock(&sdata->cleanup_stations_lock);
183 ieee80211_queue_work(&sdata->local->hw, &sdata->cleanup_stations_wk);
186 /* protected by RCU */
187 struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata,
190 struct ieee80211_local *local = sdata->local;
191 struct sta_info *sta;
193 sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)],
194 lockdep_is_held(&local->sta_mtx));
196 if (sta->sdata == sdata &&
197 ether_addr_equal(sta->sta.addr, addr))
199 sta = rcu_dereference_check(sta->hnext,
200 lockdep_is_held(&local->sta_mtx));
206 * Get sta info either from the specified interface
207 * or from one of its vlans
209 struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata,
212 struct ieee80211_local *local = sdata->local;
213 struct sta_info *sta;
215 sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)],
216 lockdep_is_held(&local->sta_mtx));
218 if ((sta->sdata == sdata ||
219 (sta->sdata->bss && sta->sdata->bss == sdata->bss)) &&
220 ether_addr_equal(sta->sta.addr, addr))
222 sta = rcu_dereference_check(sta->hnext,
223 lockdep_is_held(&local->sta_mtx));
228 struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
231 struct ieee80211_local *local = sdata->local;
232 struct sta_info *sta;
235 list_for_each_entry_rcu(sta, &local->sta_list, list) {
236 if (sdata != sta->sdata)
249 * sta_info_free - free STA
251 * @local: pointer to the global information
252 * @sta: STA info to free
254 * This function must undo everything done by sta_info_alloc()
255 * that may happen before sta_info_insert(). It may only be
256 * called when sta_info_insert() has not been attempted (and
257 * if that fails, the station is freed anyway.)
259 void sta_info_free(struct ieee80211_local *local, struct sta_info *sta)
262 rate_control_free_sta(sta);
264 sta_dbg(sta->sdata, "Destroyed STA %pM\n", sta->sta.addr);
269 /* Caller must hold local->sta_mtx */
270 static void sta_info_hash_add(struct ieee80211_local *local,
271 struct sta_info *sta)
273 lockdep_assert_held(&local->sta_mtx);
274 sta->hnext = local->sta_hash[STA_HASH(sta->sta.addr)];
275 rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)], sta);
278 static void sta_unblock(struct work_struct *wk)
280 struct sta_info *sta;
282 sta = container_of(wk, struct sta_info, drv_unblock_wk);
287 if (!test_sta_flag(sta, WLAN_STA_PS_STA)) {
289 ieee80211_sta_ps_deliver_wakeup(sta);
291 } else if (test_and_clear_sta_flag(sta, WLAN_STA_PSPOLL)) {
292 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
295 ieee80211_sta_ps_deliver_poll_response(sta);
297 } else if (test_and_clear_sta_flag(sta, WLAN_STA_UAPSD)) {
298 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
301 ieee80211_sta_ps_deliver_uapsd(sta);
304 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
307 static int sta_prepare_rate_control(struct ieee80211_local *local,
308 struct sta_info *sta, gfp_t gfp)
310 if (local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)
313 sta->rate_ctrl = local->rate_ctrl;
314 sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl,
316 if (!sta->rate_ctrl_priv)
322 struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
323 const u8 *addr, gfp_t gfp)
325 struct ieee80211_local *local = sdata->local;
326 struct sta_info *sta;
327 struct timespec uptime;
330 sta = kzalloc(sizeof(*sta) + local->hw.sta_data_size, gfp);
334 spin_lock_init(&sta->lock);
335 INIT_WORK(&sta->drv_unblock_wk, sta_unblock);
336 INIT_WORK(&sta->ampdu_mlme.work, ieee80211_ba_session_work);
337 mutex_init(&sta->ampdu_mlme.mtx);
339 memcpy(sta->sta.addr, addr, ETH_ALEN);
342 sta->last_rx = jiffies;
344 sta->sta_state = IEEE80211_STA_NONE;
346 do_posix_clock_monotonic_gettime(&uptime);
347 sta->last_connected = uptime.tv_sec;
348 ewma_init(&sta->avg_signal, 1024, 8);
350 if (sta_prepare_rate_control(local, sta, gfp)) {
355 for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
357 * timer_to_tid must be initialized with identity mapping
358 * to enable session_timer's data differentiation. See
359 * sta_rx_agg_session_timer_expired for usage.
361 sta->timer_to_tid[i] = i;
363 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
364 skb_queue_head_init(&sta->ps_tx_buf[i]);
365 skb_queue_head_init(&sta->tx_filtered[i]);
368 for (i = 0; i < IEEE80211_NUM_TIDS; i++)
369 sta->last_seq_ctrl[i] = cpu_to_le16(USHRT_MAX);
371 sta_dbg(sdata, "Allocated STA %pM\n", sta->sta.addr);
373 #ifdef CONFIG_MAC80211_MESH
374 sta->plink_state = NL80211_PLINK_LISTEN;
375 init_timer(&sta->plink_timer);
381 static int sta_info_insert_check(struct sta_info *sta)
383 struct ieee80211_sub_if_data *sdata = sta->sdata;
386 * Can't be a WARN_ON because it can be triggered through a race:
387 * something inserts a STA (on one CPU) without holding the RTNL
388 * and another CPU turns off the net device.
390 if (unlikely(!ieee80211_sdata_running(sdata)))
393 if (WARN_ON(ether_addr_equal(sta->sta.addr, sdata->vif.addr) ||
394 is_multicast_ether_addr(sta->sta.addr)))
400 static int sta_info_insert_drv_state(struct ieee80211_local *local,
401 struct ieee80211_sub_if_data *sdata,
402 struct sta_info *sta)
404 enum ieee80211_sta_state state;
407 for (state = IEEE80211_STA_NOTEXIST; state < sta->sta_state; state++) {
408 err = drv_sta_state(local, sdata, sta, state, state + 1);
415 * Drivers using legacy sta_add/sta_remove callbacks only
416 * get uploaded set to true after sta_add is called.
418 if (!local->ops->sta_add)
419 sta->uploaded = true;
423 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
425 "failed to move IBSS STA %pM to state %d (%d) - keeping it anyway\n",
426 sta->sta.addr, state + 1, err);
430 /* unwind on error */
431 for (; state > IEEE80211_STA_NOTEXIST; state--)
432 WARN_ON(drv_sta_state(local, sdata, sta, state, state - 1));
438 * should be called with sta_mtx locked
439 * this function replaces the mutex lock
442 static int sta_info_insert_finish(struct sta_info *sta) __acquires(RCU)
444 struct ieee80211_local *local = sta->local;
445 struct ieee80211_sub_if_data *sdata = sta->sdata;
446 struct station_info sinfo;
449 lockdep_assert_held(&local->sta_mtx);
451 /* check if STA exists already */
452 if (sta_info_get_bss(sdata, sta->sta.addr)) {
458 err = sta_info_insert_drv_state(local, sdata, sta);
463 local->sta_generation++;
466 /* make the station visible */
467 sta_info_hash_add(local, sta);
469 list_add_rcu(&sta->list, &local->sta_list);
471 set_sta_flag(sta, WLAN_STA_INSERTED);
473 ieee80211_sta_debugfs_add(sta);
474 rate_control_add_sta_debugfs(sta);
476 memset(&sinfo, 0, sizeof(sinfo));
478 sinfo.generation = local->sta_generation;
479 cfg80211_new_sta(sdata->dev, sta->sta.addr, &sinfo, GFP_KERNEL);
481 sta_dbg(sdata, "Inserted STA %pM\n", sta->sta.addr);
483 /* move reference to rcu-protected */
485 mutex_unlock(&local->sta_mtx);
487 if (ieee80211_vif_is_mesh(&sdata->vif))
488 mesh_accept_plinks_update(sdata);
492 mutex_unlock(&local->sta_mtx);
497 int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU)
499 struct ieee80211_local *local = sta->local;
504 err = sta_info_insert_check(sta);
510 mutex_lock(&local->sta_mtx);
512 err = sta_info_insert_finish(sta);
519 sta_info_free(local, sta);
523 int sta_info_insert(struct sta_info *sta)
525 int err = sta_info_insert_rcu(sta);
532 static inline void __bss_tim_set(u8 *tim, u16 id)
535 * This format has been mandated by the IEEE specifications,
536 * so this line may not be changed to use the __set_bit() format.
538 tim[id / 8] |= (1 << (id % 8));
541 static inline void __bss_tim_clear(u8 *tim, u16 id)
544 * This format has been mandated by the IEEE specifications,
545 * so this line may not be changed to use the __clear_bit() format.
547 tim[id / 8] &= ~(1 << (id % 8));
550 static unsigned long ieee80211_tids_for_ac(int ac)
552 /* If we ever support TIDs > 7, this obviously needs to be adjusted */
554 case IEEE80211_AC_VO:
555 return BIT(6) | BIT(7);
556 case IEEE80211_AC_VI:
557 return BIT(4) | BIT(5);
558 case IEEE80211_AC_BE:
559 return BIT(0) | BIT(3);
560 case IEEE80211_AC_BK:
561 return BIT(1) | BIT(2);
568 void sta_info_recalc_tim(struct sta_info *sta)
570 struct ieee80211_local *local = sta->local;
573 bool indicate_tim = false;
574 u8 ignore_for_tim = sta->sta.uapsd_queues;
578 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
579 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
580 if (WARN_ON_ONCE(!sta->sdata->bss))
583 ps = &sta->sdata->bss->ps;
589 /* No need to do anything if the driver does all */
590 if (local->hw.flags & IEEE80211_HW_AP_LINK_PS)
597 * If all ACs are delivery-enabled then we should build
598 * the TIM bit for all ACs anyway; if only some are then
599 * we ignore those and build the TIM bit using only the
602 if (ignore_for_tim == BIT(IEEE80211_NUM_ACS) - 1)
605 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
608 if (ignore_for_tim & BIT(ac))
611 indicate_tim |= !skb_queue_empty(&sta->tx_filtered[ac]) ||
612 !skb_queue_empty(&sta->ps_tx_buf[ac]);
616 tids = ieee80211_tids_for_ac(ac);
619 sta->driver_buffered_tids & tids;
623 spin_lock_irqsave(&local->tim_lock, flags);
626 __bss_tim_set(ps->tim, id);
628 __bss_tim_clear(ps->tim, id);
630 if (local->ops->set_tim) {
631 local->tim_in_locked_section = true;
632 drv_set_tim(local, &sta->sta, indicate_tim);
633 local->tim_in_locked_section = false;
636 spin_unlock_irqrestore(&local->tim_lock, flags);
639 static bool sta_info_buffer_expired(struct sta_info *sta, struct sk_buff *skb)
641 struct ieee80211_tx_info *info;
647 info = IEEE80211_SKB_CB(skb);
649 /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
650 timeout = (sta->listen_interval *
651 sta->sdata->vif.bss_conf.beacon_int *
653 if (timeout < STA_TX_BUFFER_EXPIRE)
654 timeout = STA_TX_BUFFER_EXPIRE;
655 return time_after(jiffies, info->control.jiffies + timeout);
659 static bool sta_info_cleanup_expire_buffered_ac(struct ieee80211_local *local,
660 struct sta_info *sta, int ac)
666 * First check for frames that should expire on the filtered
667 * queue. Frames here were rejected by the driver and are on
668 * a separate queue to avoid reordering with normal PS-buffered
669 * frames. They also aren't accounted for right now in the
670 * total_ps_buffered counter.
673 spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
674 skb = skb_peek(&sta->tx_filtered[ac]);
675 if (sta_info_buffer_expired(sta, skb))
676 skb = __skb_dequeue(&sta->tx_filtered[ac]);
679 spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
682 * Frames are queued in order, so if this one
683 * hasn't expired yet we can stop testing. If
684 * we actually reached the end of the queue we
685 * also need to stop, of course.
689 ieee80211_free_txskb(&local->hw, skb);
693 * Now also check the normal PS-buffered queue, this will
694 * only find something if the filtered queue was emptied
695 * since the filtered frames are all before the normal PS
699 spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
700 skb = skb_peek(&sta->ps_tx_buf[ac]);
701 if (sta_info_buffer_expired(sta, skb))
702 skb = __skb_dequeue(&sta->ps_tx_buf[ac]);
705 spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
708 * frames are queued in order, so if this one
709 * hasn't expired yet (or we reached the end of
710 * the queue) we can stop testing
715 local->total_ps_buffered--;
716 ps_dbg(sta->sdata, "Buffered frame expired (STA %pM)\n",
718 ieee80211_free_txskb(&local->hw, skb);
722 * Finally, recalculate the TIM bit for this station -- it might
723 * now be clear because the station was too slow to retrieve its
726 sta_info_recalc_tim(sta);
729 * Return whether there are any frames still buffered, this is
730 * used to check whether the cleanup timer still needs to run,
731 * if there are no frames we don't need to rearm the timer.
733 return !(skb_queue_empty(&sta->ps_tx_buf[ac]) &&
734 skb_queue_empty(&sta->tx_filtered[ac]));
737 static bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
738 struct sta_info *sta)
740 bool have_buffered = false;
743 /* This is only necessary for stations on BSS interfaces */
744 if (!sta->sdata->bss)
747 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
749 sta_info_cleanup_expire_buffered_ac(local, sta, ac);
751 return have_buffered;
754 int __must_check __sta_info_destroy(struct sta_info *sta)
756 struct ieee80211_local *local;
757 struct ieee80211_sub_if_data *sdata;
768 lockdep_assert_held(&local->sta_mtx);
771 * Before removing the station from the driver and
772 * rate control, it might still start new aggregation
773 * sessions -- block that to make sure the tear-down
774 * will be sufficient.
776 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
777 ieee80211_sta_tear_down_BA_sessions(sta, false);
779 ret = sta_info_hash_del(local, sta);
783 list_del_rcu(&sta->list);
785 mutex_lock(&local->key_mtx);
786 for (i = 0; i < NUM_DEFAULT_KEYS; i++)
787 __ieee80211_key_free(key_mtx_dereference(local, sta->gtk[i]));
789 __ieee80211_key_free(key_mtx_dereference(local, sta->ptk));
790 mutex_unlock(&local->key_mtx);
795 local->sta_generation++;
797 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
798 RCU_INIT_POINTER(sdata->u.vlan.sta, NULL);
800 while (sta->sta_state > IEEE80211_STA_NONE) {
801 ret = sta_info_move_state(sta, sta->sta_state - 1);
809 ret = drv_sta_state(local, sdata, sta, IEEE80211_STA_NONE,
810 IEEE80211_STA_NOTEXIST);
811 WARN_ON_ONCE(ret != 0);
814 sta_dbg(sdata, "Removed STA %pM\n", sta->sta.addr);
816 cfg80211_del_sta(sdata->dev, sta->sta.addr, GFP_KERNEL);
818 rate_control_remove_sta_debugfs(sta);
819 ieee80211_sta_debugfs_remove(sta);
821 call_rcu(&sta->rcu_head, free_sta_rcu);
826 int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, const u8 *addr)
828 struct sta_info *sta;
831 mutex_lock(&sdata->local->sta_mtx);
832 sta = sta_info_get(sdata, addr);
833 ret = __sta_info_destroy(sta);
834 mutex_unlock(&sdata->local->sta_mtx);
839 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
842 struct sta_info *sta;
845 mutex_lock(&sdata->local->sta_mtx);
846 sta = sta_info_get_bss(sdata, addr);
847 ret = __sta_info_destroy(sta);
848 mutex_unlock(&sdata->local->sta_mtx);
853 static void sta_info_cleanup(unsigned long data)
855 struct ieee80211_local *local = (struct ieee80211_local *) data;
856 struct sta_info *sta;
857 bool timer_needed = false;
860 list_for_each_entry_rcu(sta, &local->sta_list, list)
861 if (sta_info_cleanup_expire_buffered(local, sta))
865 if (local->quiescing)
871 mod_timer(&local->sta_cleanup,
872 round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL));
875 void sta_info_init(struct ieee80211_local *local)
877 spin_lock_init(&local->tim_lock);
878 mutex_init(&local->sta_mtx);
879 INIT_LIST_HEAD(&local->sta_list);
881 setup_timer(&local->sta_cleanup, sta_info_cleanup,
882 (unsigned long)local);
885 void sta_info_stop(struct ieee80211_local *local)
887 del_timer_sync(&local->sta_cleanup);
891 * sta_info_flush - flush matching STA entries from the STA table
893 * Returns the number of removed STA entries.
895 * @sdata: sdata to remove all stations from
897 int sta_info_flush(struct ieee80211_sub_if_data *sdata)
899 struct ieee80211_local *local = sdata->local;
900 struct sta_info *sta, *tmp;
905 mutex_lock(&local->sta_mtx);
906 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
907 if (sdata == sta->sdata) {
908 WARN_ON(__sta_info_destroy(sta));
912 mutex_unlock(&local->sta_mtx);
916 ieee80211_cleanup_sdata_stas(sdata);
917 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;