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 free_sta_work(struct work_struct *wk)
96 struct sta_info *sta = container_of(wk, struct sta_info, free_sta_wk);
98 struct tid_ampdu_tx *tid_tx;
99 struct ieee80211_sub_if_data *sdata = sta->sdata;
100 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)) {
112 clear_sta_flag(sta, WLAN_STA_PS_STA);
114 atomic_dec(&sdata->bss->num_sta_ps);
115 sta_info_recalc_tim(sta);
118 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
119 local->total_ps_buffered -= skb_queue_len(&sta->ps_tx_buf[ac]);
120 __skb_queue_purge(&sta->ps_tx_buf[ac]);
121 __skb_queue_purge(&sta->tx_filtered[ac]);
124 #ifdef CONFIG_MAC80211_MESH
125 if (ieee80211_vif_is_mesh(&sdata->vif)) {
126 mesh_accept_plinks_update(sdata);
127 mesh_plink_deactivate(sta);
128 del_timer_sync(&sta->plink_timer);
132 cancel_work_sync(&sta->drv_unblock_wk);
135 * Destroy aggregation state here. It would be nice to wait for the
136 * driver to finish aggregation stop and then clean up, but for now
137 * drivers have to handle aggregation stop being requested, followed
138 * directly by station destruction.
140 for (i = 0; i < STA_TID_NUM; i++) {
141 tid_tx = rcu_dereference_raw(sta->ampdu_mlme.tid_tx[i]);
144 __skb_queue_purge(&tid_tx->pending);
148 sta_info_free(local, sta);
151 static void free_sta_rcu(struct rcu_head *h)
153 struct sta_info *sta = container_of(h, struct sta_info, rcu_head);
155 ieee80211_queue_work(&sta->local->hw, &sta->free_sta_wk);
158 /* protected by RCU */
159 struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata,
162 struct ieee80211_local *local = sdata->local;
163 struct sta_info *sta;
165 sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)],
166 lockdep_is_held(&local->sta_mtx));
168 if (sta->sdata == sdata &&
169 ether_addr_equal(sta->sta.addr, addr))
171 sta = rcu_dereference_check(sta->hnext,
172 lockdep_is_held(&local->sta_mtx));
178 * Get sta info either from the specified interface
179 * or from one of its vlans
181 struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata,
184 struct ieee80211_local *local = sdata->local;
185 struct sta_info *sta;
187 sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)],
188 lockdep_is_held(&local->sta_mtx));
190 if ((sta->sdata == sdata ||
191 (sta->sdata->bss && sta->sdata->bss == sdata->bss)) &&
192 ether_addr_equal(sta->sta.addr, addr))
194 sta = rcu_dereference_check(sta->hnext,
195 lockdep_is_held(&local->sta_mtx));
200 struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
203 struct ieee80211_local *local = sdata->local;
204 struct sta_info *sta;
207 list_for_each_entry_rcu(sta, &local->sta_list, list) {
208 if (sdata != sta->sdata)
221 * sta_info_free - free STA
223 * @local: pointer to the global information
224 * @sta: STA info to free
226 * This function must undo everything done by sta_info_alloc()
227 * that may happen before sta_info_insert(). It may only be
228 * called when sta_info_insert() has not been attempted (and
229 * if that fails, the station is freed anyway.)
231 void sta_info_free(struct ieee80211_local *local, struct sta_info *sta)
234 rate_control_free_sta(sta);
236 sta_dbg(sta->sdata, "Destroyed STA %pM\n", sta->sta.addr);
241 /* Caller must hold local->sta_mtx */
242 static void sta_info_hash_add(struct ieee80211_local *local,
243 struct sta_info *sta)
245 lockdep_assert_held(&local->sta_mtx);
246 sta->hnext = local->sta_hash[STA_HASH(sta->sta.addr)];
247 rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)], sta);
250 static void sta_unblock(struct work_struct *wk)
252 struct sta_info *sta;
254 sta = container_of(wk, struct sta_info, drv_unblock_wk);
259 if (!test_sta_flag(sta, WLAN_STA_PS_STA)) {
261 ieee80211_sta_ps_deliver_wakeup(sta);
263 } else if (test_and_clear_sta_flag(sta, WLAN_STA_PSPOLL)) {
264 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
267 ieee80211_sta_ps_deliver_poll_response(sta);
269 } else if (test_and_clear_sta_flag(sta, WLAN_STA_UAPSD)) {
270 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
273 ieee80211_sta_ps_deliver_uapsd(sta);
276 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
279 static int sta_prepare_rate_control(struct ieee80211_local *local,
280 struct sta_info *sta, gfp_t gfp)
282 if (local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)
285 sta->rate_ctrl = local->rate_ctrl;
286 sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl,
288 if (!sta->rate_ctrl_priv)
294 struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
295 const u8 *addr, gfp_t gfp)
297 struct ieee80211_local *local = sdata->local;
298 struct sta_info *sta;
299 struct timespec uptime;
302 sta = kzalloc(sizeof(*sta) + local->hw.sta_data_size, gfp);
306 spin_lock_init(&sta->lock);
307 INIT_WORK(&sta->drv_unblock_wk, sta_unblock);
308 INIT_WORK(&sta->free_sta_wk, free_sta_work);
309 INIT_WORK(&sta->ampdu_mlme.work, ieee80211_ba_session_work);
310 mutex_init(&sta->ampdu_mlme.mtx);
312 memcpy(sta->sta.addr, addr, ETH_ALEN);
315 sta->last_rx = jiffies;
317 sta->sta_state = IEEE80211_STA_NONE;
319 do_posix_clock_monotonic_gettime(&uptime);
320 sta->last_connected = uptime.tv_sec;
321 ewma_init(&sta->avg_signal, 1024, 8);
323 if (sta_prepare_rate_control(local, sta, gfp)) {
328 for (i = 0; i < STA_TID_NUM; i++) {
330 * timer_to_tid must be initialized with identity mapping
331 * to enable session_timer's data differentiation. See
332 * sta_rx_agg_session_timer_expired for usage.
334 sta->timer_to_tid[i] = i;
336 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
337 skb_queue_head_init(&sta->ps_tx_buf[i]);
338 skb_queue_head_init(&sta->tx_filtered[i]);
341 for (i = 0; i < NUM_RX_DATA_QUEUES; i++)
342 sta->last_seq_ctrl[i] = cpu_to_le16(USHRT_MAX);
344 sta_dbg(sdata, "Allocated STA %pM\n", sta->sta.addr);
346 #ifdef CONFIG_MAC80211_MESH
347 sta->plink_state = NL80211_PLINK_LISTEN;
348 init_timer(&sta->plink_timer);
354 static int sta_info_insert_check(struct sta_info *sta)
356 struct ieee80211_sub_if_data *sdata = sta->sdata;
359 * Can't be a WARN_ON because it can be triggered through a race:
360 * something inserts a STA (on one CPU) without holding the RTNL
361 * and another CPU turns off the net device.
363 if (unlikely(!ieee80211_sdata_running(sdata)))
366 if (WARN_ON(ether_addr_equal(sta->sta.addr, sdata->vif.addr) ||
367 is_multicast_ether_addr(sta->sta.addr)))
373 static int sta_info_insert_drv_state(struct ieee80211_local *local,
374 struct ieee80211_sub_if_data *sdata,
375 struct sta_info *sta)
377 enum ieee80211_sta_state state;
380 for (state = IEEE80211_STA_NOTEXIST; state < sta->sta_state; state++) {
381 err = drv_sta_state(local, sdata, sta, state, state + 1);
388 * Drivers using legacy sta_add/sta_remove callbacks only
389 * get uploaded set to true after sta_add is called.
391 if (!local->ops->sta_add)
392 sta->uploaded = true;
396 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
398 "failed to move IBSS STA %pM to state %d (%d) - keeping it anyway\n",
399 sta->sta.addr, state + 1, err);
403 /* unwind on error */
404 for (; state > IEEE80211_STA_NOTEXIST; state--)
405 WARN_ON(drv_sta_state(local, sdata, sta, state, state - 1));
411 * should be called with sta_mtx locked
412 * this function replaces the mutex lock
415 static int sta_info_insert_finish(struct sta_info *sta) __acquires(RCU)
417 struct ieee80211_local *local = sta->local;
418 struct ieee80211_sub_if_data *sdata = sta->sdata;
419 struct station_info sinfo;
422 lockdep_assert_held(&local->sta_mtx);
424 /* check if STA exists already */
425 if (sta_info_get_bss(sdata, sta->sta.addr)) {
431 err = sta_info_insert_drv_state(local, sdata, sta);
436 local->sta_generation++;
439 /* make the station visible */
440 sta_info_hash_add(local, sta);
442 list_add_rcu(&sta->list, &local->sta_list);
444 set_sta_flag(sta, WLAN_STA_INSERTED);
446 ieee80211_sta_debugfs_add(sta);
447 rate_control_add_sta_debugfs(sta);
449 memset(&sinfo, 0, sizeof(sinfo));
451 sinfo.generation = local->sta_generation;
452 cfg80211_new_sta(sdata->dev, sta->sta.addr, &sinfo, GFP_KERNEL);
454 sta_dbg(sdata, "Inserted STA %pM\n", sta->sta.addr);
456 /* move reference to rcu-protected */
458 mutex_unlock(&local->sta_mtx);
460 if (ieee80211_vif_is_mesh(&sdata->vif))
461 mesh_accept_plinks_update(sdata);
465 mutex_unlock(&local->sta_mtx);
470 int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU)
472 struct ieee80211_local *local = sta->local;
477 err = sta_info_insert_check(sta);
483 mutex_lock(&local->sta_mtx);
485 err = sta_info_insert_finish(sta);
492 sta_info_free(local, sta);
496 int sta_info_insert(struct sta_info *sta)
498 int err = sta_info_insert_rcu(sta);
505 static inline void __bss_tim_set(struct ieee80211_if_ap *bss, u16 aid)
508 * This format has been mandated by the IEEE specifications,
509 * so this line may not be changed to use the __set_bit() format.
511 bss->tim[aid / 8] |= (1 << (aid % 8));
514 static inline void __bss_tim_clear(struct ieee80211_if_ap *bss, u16 aid)
517 * This format has been mandated by the IEEE specifications,
518 * so this line may not be changed to use the __clear_bit() format.
520 bss->tim[aid / 8] &= ~(1 << (aid % 8));
523 static unsigned long ieee80211_tids_for_ac(int ac)
525 /* If we ever support TIDs > 7, this obviously needs to be adjusted */
527 case IEEE80211_AC_VO:
528 return BIT(6) | BIT(7);
529 case IEEE80211_AC_VI:
530 return BIT(4) | BIT(5);
531 case IEEE80211_AC_BE:
532 return BIT(0) | BIT(3);
533 case IEEE80211_AC_BK:
534 return BIT(1) | BIT(2);
541 void sta_info_recalc_tim(struct sta_info *sta)
543 struct ieee80211_local *local = sta->local;
544 struct ieee80211_if_ap *bss = sta->sdata->bss;
546 bool indicate_tim = false;
547 u8 ignore_for_tim = sta->sta.uapsd_queues;
550 if (WARN_ON_ONCE(!sta->sdata->bss))
553 /* No need to do anything if the driver does all */
554 if (local->hw.flags & IEEE80211_HW_AP_LINK_PS)
561 * If all ACs are delivery-enabled then we should build
562 * the TIM bit for all ACs anyway; if only some are then
563 * we ignore those and build the TIM bit using only the
566 if (ignore_for_tim == BIT(IEEE80211_NUM_ACS) - 1)
569 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
572 if (ignore_for_tim & BIT(ac))
575 indicate_tim |= !skb_queue_empty(&sta->tx_filtered[ac]) ||
576 !skb_queue_empty(&sta->ps_tx_buf[ac]);
580 tids = ieee80211_tids_for_ac(ac);
583 sta->driver_buffered_tids & tids;
587 spin_lock_irqsave(&local->tim_lock, flags);
590 __bss_tim_set(bss, sta->sta.aid);
592 __bss_tim_clear(bss, sta->sta.aid);
594 if (local->ops->set_tim) {
595 local->tim_in_locked_section = true;
596 drv_set_tim(local, &sta->sta, indicate_tim);
597 local->tim_in_locked_section = false;
600 spin_unlock_irqrestore(&local->tim_lock, flags);
603 static bool sta_info_buffer_expired(struct sta_info *sta, struct sk_buff *skb)
605 struct ieee80211_tx_info *info;
611 info = IEEE80211_SKB_CB(skb);
613 /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
614 timeout = (sta->listen_interval *
615 sta->sdata->vif.bss_conf.beacon_int *
617 if (timeout < STA_TX_BUFFER_EXPIRE)
618 timeout = STA_TX_BUFFER_EXPIRE;
619 return time_after(jiffies, info->control.jiffies + timeout);
623 static bool sta_info_cleanup_expire_buffered_ac(struct ieee80211_local *local,
624 struct sta_info *sta, int ac)
630 * First check for frames that should expire on the filtered
631 * queue. Frames here were rejected by the driver and are on
632 * a separate queue to avoid reordering with normal PS-buffered
633 * frames. They also aren't accounted for right now in the
634 * total_ps_buffered counter.
637 spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
638 skb = skb_peek(&sta->tx_filtered[ac]);
639 if (sta_info_buffer_expired(sta, skb))
640 skb = __skb_dequeue(&sta->tx_filtered[ac]);
643 spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
646 * Frames are queued in order, so if this one
647 * hasn't expired yet we can stop testing. If
648 * we actually reached the end of the queue we
649 * also need to stop, of course.
653 ieee80211_free_txskb(&local->hw, skb);
657 * Now also check the normal PS-buffered queue, this will
658 * only find something if the filtered queue was emptied
659 * since the filtered frames are all before the normal PS
663 spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
664 skb = skb_peek(&sta->ps_tx_buf[ac]);
665 if (sta_info_buffer_expired(sta, skb))
666 skb = __skb_dequeue(&sta->ps_tx_buf[ac]);
669 spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
672 * frames are queued in order, so if this one
673 * hasn't expired yet (or we reached the end of
674 * the queue) we can stop testing
679 local->total_ps_buffered--;
680 ps_dbg(sta->sdata, "Buffered frame expired (STA %pM)\n",
682 ieee80211_free_txskb(&local->hw, skb);
686 * Finally, recalculate the TIM bit for this station -- it might
687 * now be clear because the station was too slow to retrieve its
690 sta_info_recalc_tim(sta);
693 * Return whether there are any frames still buffered, this is
694 * used to check whether the cleanup timer still needs to run,
695 * if there are no frames we don't need to rearm the timer.
697 return !(skb_queue_empty(&sta->ps_tx_buf[ac]) &&
698 skb_queue_empty(&sta->tx_filtered[ac]));
701 static bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
702 struct sta_info *sta)
704 bool have_buffered = false;
707 /* This is only necessary for stations on BSS interfaces */
708 if (!sta->sdata->bss)
711 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
713 sta_info_cleanup_expire_buffered_ac(local, sta, ac);
715 return have_buffered;
718 int __must_check __sta_info_destroy(struct sta_info *sta)
720 struct ieee80211_local *local;
721 struct ieee80211_sub_if_data *sdata;
732 lockdep_assert_held(&local->sta_mtx);
735 * Before removing the station from the driver and
736 * rate control, it might still start new aggregation
737 * sessions -- block that to make sure the tear-down
738 * will be sufficient.
740 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
741 ieee80211_sta_tear_down_BA_sessions(sta, false);
743 ret = sta_info_hash_del(local, sta);
747 list_del_rcu(&sta->list);
749 mutex_lock(&local->key_mtx);
750 for (i = 0; i < NUM_DEFAULT_KEYS; i++)
751 __ieee80211_key_free(key_mtx_dereference(local, sta->gtk[i]));
753 __ieee80211_key_free(key_mtx_dereference(local, sta->ptk));
754 mutex_unlock(&local->key_mtx);
759 local->sta_generation++;
761 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
762 RCU_INIT_POINTER(sdata->u.vlan.sta, NULL);
764 while (sta->sta_state > IEEE80211_STA_NONE) {
765 ret = sta_info_move_state(sta, sta->sta_state - 1);
773 ret = drv_sta_state(local, sdata, sta, IEEE80211_STA_NONE,
774 IEEE80211_STA_NOTEXIST);
775 WARN_ON_ONCE(ret != 0);
778 sta_dbg(sdata, "Removed STA %pM\n", sta->sta.addr);
780 cfg80211_del_sta(sdata->dev, sta->sta.addr, GFP_KERNEL);
782 rate_control_remove_sta_debugfs(sta);
783 ieee80211_sta_debugfs_remove(sta);
785 call_rcu(&sta->rcu_head, free_sta_rcu);
790 int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, const u8 *addr)
792 struct sta_info *sta;
795 mutex_lock(&sdata->local->sta_mtx);
796 sta = sta_info_get(sdata, addr);
797 ret = __sta_info_destroy(sta);
798 mutex_unlock(&sdata->local->sta_mtx);
803 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
806 struct sta_info *sta;
809 mutex_lock(&sdata->local->sta_mtx);
810 sta = sta_info_get_bss(sdata, addr);
811 ret = __sta_info_destroy(sta);
812 mutex_unlock(&sdata->local->sta_mtx);
817 static void sta_info_cleanup(unsigned long data)
819 struct ieee80211_local *local = (struct ieee80211_local *) data;
820 struct sta_info *sta;
821 bool timer_needed = false;
824 list_for_each_entry_rcu(sta, &local->sta_list, list)
825 if (sta_info_cleanup_expire_buffered(local, sta))
829 if (local->quiescing)
835 mod_timer(&local->sta_cleanup,
836 round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL));
839 void sta_info_init(struct ieee80211_local *local)
841 spin_lock_init(&local->tim_lock);
842 mutex_init(&local->sta_mtx);
843 INIT_LIST_HEAD(&local->sta_list);
845 setup_timer(&local->sta_cleanup, sta_info_cleanup,
846 (unsigned long)local);
849 void sta_info_stop(struct ieee80211_local *local)
851 del_timer(&local->sta_cleanup);
852 sta_info_flush(local, NULL);
856 * sta_info_flush - flush matching STA entries from the STA table
858 * Returns the number of removed STA entries.
860 * @local: local interface data
861 * @sdata: matching rule for the net device (sta->dev) or %NULL to match all STAs
863 int sta_info_flush(struct ieee80211_local *local,
864 struct ieee80211_sub_if_data *sdata)
866 struct sta_info *sta, *tmp;
871 mutex_lock(&local->sta_mtx);
872 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
873 if (!sdata || sdata == sta->sdata) {
874 WARN_ON(__sta_info_destroy(sta));
878 mutex_unlock(&local->sta_mtx);
883 void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
884 unsigned long exp_time)
886 struct ieee80211_local *local = sdata->local;
887 struct sta_info *sta, *tmp;
889 mutex_lock(&local->sta_mtx);
891 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
892 if (sdata != sta->sdata)
895 if (time_after(jiffies, sta->last_rx + exp_time)) {
896 ibss_dbg(sdata, "expiring inactive STA %pM\n",
898 WARN_ON(__sta_info_destroy(sta));
902 mutex_unlock(&local->sta_mtx);
905 struct ieee80211_sta *ieee80211_find_sta_by_ifaddr(struct ieee80211_hw *hw,
909 struct sta_info *sta, *nxt;
912 * Just return a random station if localaddr is NULL
915 for_each_sta_info(hw_to_local(hw), addr, sta, nxt) {
917 !ether_addr_equal(sta->sdata->vif.addr, localaddr))
926 EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr);
928 struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif,
931 struct sta_info *sta;
936 sta = sta_info_get_bss(vif_to_sdata(vif), addr);
945 EXPORT_SYMBOL(ieee80211_find_sta);
947 static void clear_sta_ps_flags(void *_sta)
949 struct sta_info *sta = _sta;
950 struct ieee80211_sub_if_data *sdata = sta->sdata;
952 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
953 if (test_and_clear_sta_flag(sta, WLAN_STA_PS_STA))
954 atomic_dec(&sdata->bss->num_sta_ps);
957 /* powersave support code */
958 void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta)
960 struct ieee80211_sub_if_data *sdata = sta->sdata;
961 struct ieee80211_local *local = sdata->local;
962 struct sk_buff_head pending;
963 int filtered = 0, buffered = 0, ac;
965 clear_sta_flag(sta, WLAN_STA_SP);
967 BUILD_BUG_ON(BITS_TO_LONGS(STA_TID_NUM) > 1);
968 sta->driver_buffered_tids = 0;
970 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
971 drv_sta_notify(local, sdata, STA_NOTIFY_AWAKE, &sta->sta);
973 skb_queue_head_init(&pending);
975 /* Send all buffered frames to the station */
976 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
977 int count = skb_queue_len(&pending), tmp;
979 skb_queue_splice_tail_init(&sta->tx_filtered[ac], &pending);
980 tmp = skb_queue_len(&pending);
981 filtered += tmp - count;
984 skb_queue_splice_tail_init(&sta->ps_tx_buf[ac], &pending);
985 tmp = skb_queue_len(&pending);
986 buffered += tmp - count;
989 ieee80211_add_pending_skbs_fn(local, &pending, clear_sta_ps_flags, sta);
991 local->total_ps_buffered -= buffered;
993 sta_info_recalc_tim(sta);
996 "STA %pM aid %d sending %d filtered/%d PS frames since STA not sleeping anymore\n",
997 sta->sta.addr, sta->sta.aid, filtered, buffered);
1000 static void ieee80211_send_null_response(struct ieee80211_sub_if_data *sdata,
1001 struct sta_info *sta, int tid,
1002 enum ieee80211_frame_release_type reason)
1004 struct ieee80211_local *local = sdata->local;
1005 struct ieee80211_qos_hdr *nullfunc;
1006 struct sk_buff *skb;
1007 int size = sizeof(*nullfunc);
1009 bool qos = test_sta_flag(sta, WLAN_STA_WME);
1010 struct ieee80211_tx_info *info;
1013 fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1014 IEEE80211_STYPE_QOS_NULLFUNC |
1015 IEEE80211_FCTL_FROMDS);
1018 fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1019 IEEE80211_STYPE_NULLFUNC |
1020 IEEE80211_FCTL_FROMDS);
1023 skb = dev_alloc_skb(local->hw.extra_tx_headroom + size);
1027 skb_reserve(skb, local->hw.extra_tx_headroom);
1029 nullfunc = (void *) skb_put(skb, size);
1030 nullfunc->frame_control = fc;
1031 nullfunc->duration_id = 0;
1032 memcpy(nullfunc->addr1, sta->sta.addr, ETH_ALEN);
1033 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
1034 memcpy(nullfunc->addr3, sdata->vif.addr, ETH_ALEN);
1036 skb->priority = tid;
1037 skb_set_queue_mapping(skb, ieee802_1d_to_ac[tid]);
1039 nullfunc->qos_ctrl = cpu_to_le16(tid);
1041 if (reason == IEEE80211_FRAME_RELEASE_UAPSD)
1042 nullfunc->qos_ctrl |=
1043 cpu_to_le16(IEEE80211_QOS_CTL_EOSP);
1046 info = IEEE80211_SKB_CB(skb);
1049 * Tell TX path to send this frame even though the
1050 * STA may still remain is PS mode after this frame
1051 * exchange. Also set EOSP to indicate this packet
1052 * ends the poll/service period.
1054 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER |
1055 IEEE80211_TX_STATUS_EOSP |
1056 IEEE80211_TX_CTL_REQ_TX_STATUS;
1058 drv_allow_buffered_frames(local, sta, BIT(tid), 1, reason, false);
1060 ieee80211_xmit(sdata, skb);
1064 ieee80211_sta_ps_deliver_response(struct sta_info *sta,
1065 int n_frames, u8 ignored_acs,
1066 enum ieee80211_frame_release_type reason)
1068 struct ieee80211_sub_if_data *sdata = sta->sdata;
1069 struct ieee80211_local *local = sdata->local;
1071 bool more_data = false;
1073 unsigned long driver_release_tids = 0;
1074 struct sk_buff_head frames;
1076 /* Service or PS-Poll period starts */
1077 set_sta_flag(sta, WLAN_STA_SP);
1079 __skb_queue_head_init(&frames);
1082 * Get response frame(s) and more data bit for it.
1084 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1087 if (ignored_acs & BIT(ac))
1090 tids = ieee80211_tids_for_ac(ac);
1093 driver_release_tids = sta->driver_buffered_tids & tids;
1094 if (driver_release_tids) {
1097 struct sk_buff *skb;
1099 while (n_frames > 0) {
1100 skb = skb_dequeue(&sta->tx_filtered[ac]);
1103 &sta->ps_tx_buf[ac]);
1105 local->total_ps_buffered--;
1111 __skb_queue_tail(&frames, skb);
1116 * If the driver has data on more than one TID then
1117 * certainly there's more data if we release just a
1118 * single frame now (from a single TID).
1120 if (reason == IEEE80211_FRAME_RELEASE_PSPOLL &&
1121 hweight16(driver_release_tids) > 1) {
1123 driver_release_tids =
1124 BIT(ffs(driver_release_tids) - 1);
1129 if (!skb_queue_empty(&sta->tx_filtered[ac]) ||
1130 !skb_queue_empty(&sta->ps_tx_buf[ac])) {
1140 * For PS-Poll, this can only happen due to a race condition
1141 * when we set the TIM bit and the station notices it, but
1142 * before it can poll for the frame we expire it.
1144 * For uAPSD, this is said in the standard (11.2.1.5 h):
1145 * At each unscheduled SP for a non-AP STA, the AP shall
1146 * attempt to transmit at least one MSDU or MMPDU, but no
1147 * more than the value specified in the Max SP Length field
1148 * in the QoS Capability element from delivery-enabled ACs,
1149 * that are destined for the non-AP STA.
1151 * Since we have no other MSDU/MMPDU, transmit a QoS null frame.
1154 /* This will evaluate to 1, 3, 5 or 7. */
1155 tid = 7 - ((ffs(~ignored_acs) - 1) << 1);
1157 ieee80211_send_null_response(sdata, sta, tid, reason);
1161 if (!driver_release_tids) {
1162 struct sk_buff_head pending;
1163 struct sk_buff *skb;
1167 skb_queue_head_init(&pending);
1169 while ((skb = __skb_dequeue(&frames))) {
1170 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1171 struct ieee80211_hdr *hdr = (void *) skb->data;
1177 * Tell TX path to send this frame even though the
1178 * STA may still remain is PS mode after this frame
1181 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
1184 * Use MoreData flag to indicate whether there are
1185 * more buffered frames for this STA
1187 if (more_data || !skb_queue_empty(&frames))
1188 hdr->frame_control |=
1189 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1191 hdr->frame_control &=
1192 cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
1194 if (ieee80211_is_data_qos(hdr->frame_control) ||
1195 ieee80211_is_qos_nullfunc(hdr->frame_control))
1196 qoshdr = ieee80211_get_qos_ctl(hdr);
1198 /* end service period after last frame */
1199 if (skb_queue_empty(&frames)) {
1200 if (reason == IEEE80211_FRAME_RELEASE_UAPSD &&
1202 *qoshdr |= IEEE80211_QOS_CTL_EOSP;
1204 info->flags |= IEEE80211_TX_STATUS_EOSP |
1205 IEEE80211_TX_CTL_REQ_TX_STATUS;
1209 tids |= BIT(*qoshdr & IEEE80211_QOS_CTL_TID_MASK);
1213 __skb_queue_tail(&pending, skb);
1216 drv_allow_buffered_frames(local, sta, tids, num,
1219 ieee80211_add_pending_skbs(local, &pending);
1221 sta_info_recalc_tim(sta);
1224 * We need to release a frame that is buffered somewhere in the
1225 * driver ... it'll have to handle that.
1226 * Note that, as per the comment above, it'll also have to see
1227 * if there is more than just one frame on the specific TID that
1228 * we're releasing from, and it needs to set the more-data bit
1229 * accordingly if we tell it that there's no more data. If we do
1230 * tell it there's more data, then of course the more-data bit
1231 * needs to be set anyway.
1233 drv_release_buffered_frames(local, sta, driver_release_tids,
1234 n_frames, reason, more_data);
1237 * Note that we don't recalculate the TIM bit here as it would
1238 * most likely have no effect at all unless the driver told us
1239 * that the TID became empty before returning here from the
1241 * Either way, however, when the driver tells us that the TID
1242 * became empty we'll do the TIM recalculation.
1247 void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta)
1249 u8 ignore_for_response = sta->sta.uapsd_queues;
1252 * If all ACs are delivery-enabled then we should reply
1253 * from any of them, if only some are enabled we reply
1254 * only from the non-enabled ones.
1256 if (ignore_for_response == BIT(IEEE80211_NUM_ACS) - 1)
1257 ignore_for_response = 0;
1259 ieee80211_sta_ps_deliver_response(sta, 1, ignore_for_response,
1260 IEEE80211_FRAME_RELEASE_PSPOLL);
1263 void ieee80211_sta_ps_deliver_uapsd(struct sta_info *sta)
1265 int n_frames = sta->sta.max_sp;
1266 u8 delivery_enabled = sta->sta.uapsd_queues;
1269 * If we ever grow support for TSPEC this might happen if
1270 * the TSPEC update from hostapd comes in between a trigger
1271 * frame setting WLAN_STA_UAPSD in the RX path and this
1272 * actually getting called.
1274 if (!delivery_enabled)
1277 switch (sta->sta.max_sp) {
1288 /* XXX: what is a good value? */
1293 ieee80211_sta_ps_deliver_response(sta, n_frames, ~delivery_enabled,
1294 IEEE80211_FRAME_RELEASE_UAPSD);
1297 void ieee80211_sta_block_awake(struct ieee80211_hw *hw,
1298 struct ieee80211_sta *pubsta, bool block)
1300 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1302 trace_api_sta_block_awake(sta->local, pubsta, block);
1305 set_sta_flag(sta, WLAN_STA_PS_DRIVER);
1306 else if (test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1307 ieee80211_queue_work(hw, &sta->drv_unblock_wk);
1309 EXPORT_SYMBOL(ieee80211_sta_block_awake);
1311 void ieee80211_sta_eosp_irqsafe(struct ieee80211_sta *pubsta)
1313 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1314 struct ieee80211_local *local = sta->local;
1315 struct sk_buff *skb;
1316 struct skb_eosp_msg_data *data;
1318 trace_api_eosp(local, pubsta);
1320 skb = alloc_skb(0, GFP_ATOMIC);
1322 /* too bad ... but race is better than loss */
1323 clear_sta_flag(sta, WLAN_STA_SP);
1327 data = (void *)skb->cb;
1328 memcpy(data->sta, pubsta->addr, ETH_ALEN);
1329 memcpy(data->iface, sta->sdata->vif.addr, ETH_ALEN);
1330 skb->pkt_type = IEEE80211_EOSP_MSG;
1331 skb_queue_tail(&local->skb_queue, skb);
1332 tasklet_schedule(&local->tasklet);
1334 EXPORT_SYMBOL(ieee80211_sta_eosp_irqsafe);
1336 void ieee80211_sta_set_buffered(struct ieee80211_sta *pubsta,
1337 u8 tid, bool buffered)
1339 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1341 if (WARN_ON(tid >= STA_TID_NUM))
1345 set_bit(tid, &sta->driver_buffered_tids);
1347 clear_bit(tid, &sta->driver_buffered_tids);
1349 sta_info_recalc_tim(sta);
1351 EXPORT_SYMBOL(ieee80211_sta_set_buffered);
1353 int sta_info_move_state(struct sta_info *sta,
1354 enum ieee80211_sta_state new_state)
1358 if (sta->sta_state == new_state)
1361 /* check allowed transitions first */
1363 switch (new_state) {
1364 case IEEE80211_STA_NONE:
1365 if (sta->sta_state != IEEE80211_STA_AUTH)
1368 case IEEE80211_STA_AUTH:
1369 if (sta->sta_state != IEEE80211_STA_NONE &&
1370 sta->sta_state != IEEE80211_STA_ASSOC)
1373 case IEEE80211_STA_ASSOC:
1374 if (sta->sta_state != IEEE80211_STA_AUTH &&
1375 sta->sta_state != IEEE80211_STA_AUTHORIZED)
1378 case IEEE80211_STA_AUTHORIZED:
1379 if (sta->sta_state != IEEE80211_STA_ASSOC)
1383 WARN(1, "invalid state %d", new_state);
1387 sta_dbg(sta->sdata, "moving STA %pM to state %d\n",
1388 sta->sta.addr, new_state);
1391 * notify the driver before the actual changes so it can
1392 * fail the transition
1394 if (test_sta_flag(sta, WLAN_STA_INSERTED)) {
1395 int err = drv_sta_state(sta->local, sta->sdata, sta,
1396 sta->sta_state, new_state);
1401 /* reflect the change in all state variables */
1403 switch (new_state) {
1404 case IEEE80211_STA_NONE:
1405 if (sta->sta_state == IEEE80211_STA_AUTH)
1406 clear_bit(WLAN_STA_AUTH, &sta->_flags);
1408 case IEEE80211_STA_AUTH:
1409 if (sta->sta_state == IEEE80211_STA_NONE)
1410 set_bit(WLAN_STA_AUTH, &sta->_flags);
1411 else if (sta->sta_state == IEEE80211_STA_ASSOC)
1412 clear_bit(WLAN_STA_ASSOC, &sta->_flags);
1414 case IEEE80211_STA_ASSOC:
1415 if (sta->sta_state == IEEE80211_STA_AUTH) {
1416 set_bit(WLAN_STA_ASSOC, &sta->_flags);
1417 } else if (sta->sta_state == IEEE80211_STA_AUTHORIZED) {
1418 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1419 (sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1420 !sta->sdata->u.vlan.sta))
1421 atomic_dec(&sta->sdata->bss->num_mcast_sta);
1422 clear_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
1425 case IEEE80211_STA_AUTHORIZED:
1426 if (sta->sta_state == IEEE80211_STA_ASSOC) {
1427 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1428 (sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1429 !sta->sdata->u.vlan.sta))
1430 atomic_inc(&sta->sdata->bss->num_mcast_sta);
1431 set_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
1438 sta->sta_state = new_state;