2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
10 #include <linux/module.h>
11 #include <linux/init.h>
12 #include <linux/etherdevice.h>
13 #include <linux/netdevice.h>
14 #include <linux/types.h>
15 #include <linux/slab.h>
16 #include <linux/skbuff.h>
17 #include <linux/if_arp.h>
18 #include <linux/timer.h>
19 #include <linux/rtnetlink.h>
21 #include <net/mac80211.h>
22 #include "ieee80211_i.h"
23 #include "driver-ops.h"
26 #include "debugfs_sta.h"
31 * DOC: STA information lifetime rules
33 * STA info structures (&struct sta_info) are managed in a hash table
34 * for faster lookup and a list for iteration. They are managed using
35 * RCU, i.e. access to the list and hash table is protected by RCU.
37 * Upon allocating a STA info structure with sta_info_alloc(), the caller
38 * owns that structure. It must then insert it into the hash table using
39 * either sta_info_insert() or sta_info_insert_rcu(); only in the latter
40 * case (which acquires an rcu read section but must not be called from
41 * within one) will the pointer still be valid after the call. Note that
42 * the caller may not do much with the STA info before inserting it, in
43 * particular, it may not start any mesh peer link management or add
46 * When the insertion fails (sta_info_insert()) returns non-zero), the
47 * structure will have been freed by sta_info_insert()!
49 * Station entries are added by mac80211 when you establish a link with a
50 * peer. This means different things for the different type of interfaces
51 * we support. For a regular station this mean we add the AP sta when we
52 * receive an association response from the AP. For IBSS this occurs when
53 * get to know about a peer on the same IBSS. For WDS we add the sta for
54 * the peer immediately upon device open. When using AP mode we add stations
55 * for each respective station upon request from userspace through nl80211.
57 * In order to remove a STA info structure, various sta_info_destroy_*()
58 * calls are available.
60 * There is no concept of ownership on a STA entry, each structure is
61 * owned by the global hash table/list until it is removed. All users of
62 * the structure need to be RCU protected so that the structure won't be
63 * freed before they are done using it.
66 /* Caller must hold local->sta_mtx */
67 static int sta_info_hash_del(struct ieee80211_local *local,
72 s = rcu_dereference_protected(local->sta_hash[STA_HASH(sta->sta.addr)],
73 lockdep_is_held(&local->sta_mtx));
77 rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)],
82 while (rcu_access_pointer(s->hnext) &&
83 rcu_access_pointer(s->hnext) != sta)
84 s = rcu_dereference_protected(s->hnext,
85 lockdep_is_held(&local->sta_mtx));
86 if (rcu_access_pointer(s->hnext)) {
87 rcu_assign_pointer(s->hnext, sta->hnext);
94 /* protected by RCU */
95 struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata,
98 struct ieee80211_local *local = sdata->local;
101 sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)],
102 lockdep_is_held(&local->sta_mtx));
104 if (sta->sdata == sdata &&
105 ether_addr_equal(sta->sta.addr, addr))
107 sta = rcu_dereference_check(sta->hnext,
108 lockdep_is_held(&local->sta_mtx));
114 * Get sta info either from the specified interface
115 * or from one of its vlans
117 struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata,
120 struct ieee80211_local *local = sdata->local;
121 struct sta_info *sta;
123 sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)],
124 lockdep_is_held(&local->sta_mtx));
126 if ((sta->sdata == sdata ||
127 (sta->sdata->bss && sta->sdata->bss == sdata->bss)) &&
128 ether_addr_equal(sta->sta.addr, addr))
130 sta = rcu_dereference_check(sta->hnext,
131 lockdep_is_held(&local->sta_mtx));
136 struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
139 struct ieee80211_local *local = sdata->local;
140 struct sta_info *sta;
143 list_for_each_entry_rcu(sta, &local->sta_list, list) {
144 if (sdata != sta->sdata)
157 * sta_info_free - free STA
159 * @local: pointer to the global information
160 * @sta: STA info to free
162 * This function must undo everything done by sta_info_alloc()
163 * that may happen before sta_info_insert(). It may only be
164 * called when sta_info_insert() has not been attempted (and
165 * if that fails, the station is freed anyway.)
167 void sta_info_free(struct ieee80211_local *local, struct sta_info *sta)
170 rate_control_free_sta(sta);
172 sta_dbg(sta->sdata, "Destroyed STA %pM\n", sta->sta.addr);
177 /* Caller must hold local->sta_mtx */
178 static void sta_info_hash_add(struct ieee80211_local *local,
179 struct sta_info *sta)
181 lockdep_assert_held(&local->sta_mtx);
182 sta->hnext = local->sta_hash[STA_HASH(sta->sta.addr)];
183 rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)], sta);
186 static void sta_unblock(struct work_struct *wk)
188 struct sta_info *sta;
190 sta = container_of(wk, struct sta_info, drv_unblock_wk);
195 if (!test_sta_flag(sta, WLAN_STA_PS_STA)) {
197 ieee80211_sta_ps_deliver_wakeup(sta);
199 } else if (test_and_clear_sta_flag(sta, WLAN_STA_PSPOLL)) {
200 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
203 ieee80211_sta_ps_deliver_poll_response(sta);
205 } else if (test_and_clear_sta_flag(sta, WLAN_STA_UAPSD)) {
206 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
209 ieee80211_sta_ps_deliver_uapsd(sta);
212 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
215 static int sta_prepare_rate_control(struct ieee80211_local *local,
216 struct sta_info *sta, gfp_t gfp)
218 if (local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)
221 sta->rate_ctrl = local->rate_ctrl;
222 sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl,
224 if (!sta->rate_ctrl_priv)
230 struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
231 const u8 *addr, gfp_t gfp)
233 struct ieee80211_local *local = sdata->local;
234 struct sta_info *sta;
235 struct timespec uptime;
238 sta = kzalloc(sizeof(*sta) + local->hw.sta_data_size, gfp);
242 spin_lock_init(&sta->lock);
243 INIT_WORK(&sta->drv_unblock_wk, sta_unblock);
244 INIT_WORK(&sta->ampdu_mlme.work, ieee80211_ba_session_work);
245 mutex_init(&sta->ampdu_mlme.mtx);
247 memcpy(sta->sta.addr, addr, ETH_ALEN);
250 sta->last_rx = jiffies;
252 sta->sta_state = IEEE80211_STA_NONE;
254 do_posix_clock_monotonic_gettime(&uptime);
255 sta->last_connected = uptime.tv_sec;
256 ewma_init(&sta->avg_signal, 1024, 8);
258 if (sta_prepare_rate_control(local, sta, gfp)) {
263 for (i = 0; i < STA_TID_NUM; i++) {
265 * timer_to_tid must be initialized with identity mapping
266 * to enable session_timer's data differentiation. See
267 * sta_rx_agg_session_timer_expired for usage.
269 sta->timer_to_tid[i] = i;
271 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
272 skb_queue_head_init(&sta->ps_tx_buf[i]);
273 skb_queue_head_init(&sta->tx_filtered[i]);
276 for (i = 0; i < NUM_RX_DATA_QUEUES; i++)
277 sta->last_seq_ctrl[i] = cpu_to_le16(USHRT_MAX);
279 sta_dbg(sdata, "Allocated STA %pM\n", sta->sta.addr);
281 #ifdef CONFIG_MAC80211_MESH
282 sta->plink_state = NL80211_PLINK_LISTEN;
283 init_timer(&sta->plink_timer);
289 static int sta_info_insert_check(struct sta_info *sta)
291 struct ieee80211_sub_if_data *sdata = sta->sdata;
294 * Can't be a WARN_ON because it can be triggered through a race:
295 * something inserts a STA (on one CPU) without holding the RTNL
296 * and another CPU turns off the net device.
298 if (unlikely(!ieee80211_sdata_running(sdata)))
301 if (WARN_ON(ether_addr_equal(sta->sta.addr, sdata->vif.addr) ||
302 is_multicast_ether_addr(sta->sta.addr)))
308 static int sta_info_insert_drv_state(struct ieee80211_local *local,
309 struct ieee80211_sub_if_data *sdata,
310 struct sta_info *sta)
312 enum ieee80211_sta_state state;
315 for (state = IEEE80211_STA_NOTEXIST; state < sta->sta_state; state++) {
316 err = drv_sta_state(local, sdata, sta, state, state + 1);
323 * Drivers using legacy sta_add/sta_remove callbacks only
324 * get uploaded set to true after sta_add is called.
326 if (!local->ops->sta_add)
327 sta->uploaded = true;
331 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
333 "failed to move IBSS STA %pM to state %d (%d) - keeping it anyway\n",
334 sta->sta.addr, state + 1, err);
338 /* unwind on error */
339 for (; state > IEEE80211_STA_NOTEXIST; state--)
340 WARN_ON(drv_sta_state(local, sdata, sta, state, state - 1));
346 * should be called with sta_mtx locked
347 * this function replaces the mutex lock
350 static int sta_info_insert_finish(struct sta_info *sta) __acquires(RCU)
352 struct ieee80211_local *local = sta->local;
353 struct ieee80211_sub_if_data *sdata = sta->sdata;
354 struct station_info sinfo;
357 lockdep_assert_held(&local->sta_mtx);
359 /* check if STA exists already */
360 if (sta_info_get_bss(sdata, sta->sta.addr)) {
366 err = sta_info_insert_drv_state(local, sdata, sta);
371 local->sta_generation++;
374 /* make the station visible */
375 sta_info_hash_add(local, sta);
377 list_add_rcu(&sta->list, &local->sta_list);
379 set_sta_flag(sta, WLAN_STA_INSERTED);
381 ieee80211_sta_debugfs_add(sta);
382 rate_control_add_sta_debugfs(sta);
384 memset(&sinfo, 0, sizeof(sinfo));
386 sinfo.generation = local->sta_generation;
387 cfg80211_new_sta(sdata->dev, sta->sta.addr, &sinfo, GFP_KERNEL);
389 sta_dbg(sdata, "Inserted STA %pM\n", sta->sta.addr);
391 /* move reference to rcu-protected */
393 mutex_unlock(&local->sta_mtx);
395 if (ieee80211_vif_is_mesh(&sdata->vif))
396 mesh_accept_plinks_update(sdata);
400 mutex_unlock(&local->sta_mtx);
405 int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU)
407 struct ieee80211_local *local = sta->local;
412 err = sta_info_insert_check(sta);
418 mutex_lock(&local->sta_mtx);
420 err = sta_info_insert_finish(sta);
427 sta_info_free(local, sta);
431 int sta_info_insert(struct sta_info *sta)
433 int err = sta_info_insert_rcu(sta);
440 static inline void __bss_tim_set(struct ieee80211_if_ap *bss, u16 aid)
443 * This format has been mandated by the IEEE specifications,
444 * so this line may not be changed to use the __set_bit() format.
446 bss->tim[aid / 8] |= (1 << (aid % 8));
449 static inline void __bss_tim_clear(struct ieee80211_if_ap *bss, u16 aid)
452 * This format has been mandated by the IEEE specifications,
453 * so this line may not be changed to use the __clear_bit() format.
455 bss->tim[aid / 8] &= ~(1 << (aid % 8));
458 static unsigned long ieee80211_tids_for_ac(int ac)
460 /* If we ever support TIDs > 7, this obviously needs to be adjusted */
462 case IEEE80211_AC_VO:
463 return BIT(6) | BIT(7);
464 case IEEE80211_AC_VI:
465 return BIT(4) | BIT(5);
466 case IEEE80211_AC_BE:
467 return BIT(0) | BIT(3);
468 case IEEE80211_AC_BK:
469 return BIT(1) | BIT(2);
476 void sta_info_recalc_tim(struct sta_info *sta)
478 struct ieee80211_local *local = sta->local;
479 struct ieee80211_if_ap *bss = sta->sdata->bss;
481 bool indicate_tim = false;
482 u8 ignore_for_tim = sta->sta.uapsd_queues;
485 if (WARN_ON_ONCE(!sta->sdata->bss))
488 /* No need to do anything if the driver does all */
489 if (local->hw.flags & IEEE80211_HW_AP_LINK_PS)
496 * If all ACs are delivery-enabled then we should build
497 * the TIM bit for all ACs anyway; if only some are then
498 * we ignore those and build the TIM bit using only the
501 if (ignore_for_tim == BIT(IEEE80211_NUM_ACS) - 1)
504 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
507 if (ignore_for_tim & BIT(ac))
510 indicate_tim |= !skb_queue_empty(&sta->tx_filtered[ac]) ||
511 !skb_queue_empty(&sta->ps_tx_buf[ac]);
515 tids = ieee80211_tids_for_ac(ac);
518 sta->driver_buffered_tids & tids;
522 spin_lock_irqsave(&local->tim_lock, flags);
525 __bss_tim_set(bss, sta->sta.aid);
527 __bss_tim_clear(bss, sta->sta.aid);
529 if (local->ops->set_tim) {
530 local->tim_in_locked_section = true;
531 drv_set_tim(local, &sta->sta, indicate_tim);
532 local->tim_in_locked_section = false;
535 spin_unlock_irqrestore(&local->tim_lock, flags);
538 static bool sta_info_buffer_expired(struct sta_info *sta, struct sk_buff *skb)
540 struct ieee80211_tx_info *info;
546 info = IEEE80211_SKB_CB(skb);
548 /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
549 timeout = (sta->listen_interval *
550 sta->sdata->vif.bss_conf.beacon_int *
552 if (timeout < STA_TX_BUFFER_EXPIRE)
553 timeout = STA_TX_BUFFER_EXPIRE;
554 return time_after(jiffies, info->control.jiffies + timeout);
558 static bool sta_info_cleanup_expire_buffered_ac(struct ieee80211_local *local,
559 struct sta_info *sta, int ac)
565 * First check for frames that should expire on the filtered
566 * queue. Frames here were rejected by the driver and are on
567 * a separate queue to avoid reordering with normal PS-buffered
568 * frames. They also aren't accounted for right now in the
569 * total_ps_buffered counter.
572 spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
573 skb = skb_peek(&sta->tx_filtered[ac]);
574 if (sta_info_buffer_expired(sta, skb))
575 skb = __skb_dequeue(&sta->tx_filtered[ac]);
578 spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
581 * Frames are queued in order, so if this one
582 * hasn't expired yet we can stop testing. If
583 * we actually reached the end of the queue we
584 * also need to stop, of course.
592 * Now also check the normal PS-buffered queue, this will
593 * only find something if the filtered queue was emptied
594 * since the filtered frames are all before the normal PS
598 spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
599 skb = skb_peek(&sta->ps_tx_buf[ac]);
600 if (sta_info_buffer_expired(sta, skb))
601 skb = __skb_dequeue(&sta->ps_tx_buf[ac]);
604 spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
607 * frames are queued in order, so if this one
608 * hasn't expired yet (or we reached the end of
609 * the queue) we can stop testing
614 local->total_ps_buffered--;
615 ps_dbg(sta->sdata, "Buffered frame expired (STA %pM)\n",
621 * Finally, recalculate the TIM bit for this station -- it might
622 * now be clear because the station was too slow to retrieve its
625 sta_info_recalc_tim(sta);
628 * Return whether there are any frames still buffered, this is
629 * used to check whether the cleanup timer still needs to run,
630 * if there are no frames we don't need to rearm the timer.
632 return !(skb_queue_empty(&sta->ps_tx_buf[ac]) &&
633 skb_queue_empty(&sta->tx_filtered[ac]));
636 static bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
637 struct sta_info *sta)
639 bool have_buffered = false;
642 /* This is only necessary for stations on BSS interfaces */
643 if (!sta->sdata->bss)
646 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
648 sta_info_cleanup_expire_buffered_ac(local, sta, ac);
650 return have_buffered;
653 int __must_check __sta_info_destroy(struct sta_info *sta)
655 struct ieee80211_local *local;
656 struct ieee80211_sub_if_data *sdata;
658 struct tid_ampdu_tx *tid_tx;
668 lockdep_assert_held(&local->sta_mtx);
671 * Before removing the station from the driver and
672 * rate control, it might still start new aggregation
673 * sessions -- block that to make sure the tear-down
674 * will be sufficient.
676 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
677 ieee80211_sta_tear_down_BA_sessions(sta, true);
679 ret = sta_info_hash_del(local, sta);
683 list_del_rcu(&sta->list);
685 mutex_lock(&local->key_mtx);
686 for (i = 0; i < NUM_DEFAULT_KEYS; i++)
687 __ieee80211_key_free(key_mtx_dereference(local, sta->gtk[i]));
689 __ieee80211_key_free(key_mtx_dereference(local, sta->ptk));
690 mutex_unlock(&local->key_mtx);
695 local->sta_generation++;
697 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
698 RCU_INIT_POINTER(sdata->u.vlan.sta, NULL);
700 while (sta->sta_state > IEEE80211_STA_NONE) {
701 ret = sta_info_move_state(sta, sta->sta_state - 1);
709 ret = drv_sta_state(local, sdata, sta, IEEE80211_STA_NONE,
710 IEEE80211_STA_NOTEXIST);
711 WARN_ON_ONCE(ret != 0);
715 * At this point, after we wait for an RCU grace period,
716 * neither mac80211 nor the driver can reference this
717 * sta struct any more except by still existing timers
718 * associated with this station that we clean up below.
722 if (test_sta_flag(sta, WLAN_STA_PS_STA)) {
725 clear_sta_flag(sta, WLAN_STA_PS_STA);
727 atomic_dec(&sdata->bss->num_sta_ps);
728 sta_info_recalc_tim(sta);
731 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
732 local->total_ps_buffered -= skb_queue_len(&sta->ps_tx_buf[ac]);
733 __skb_queue_purge(&sta->ps_tx_buf[ac]);
734 __skb_queue_purge(&sta->tx_filtered[ac]);
737 #ifdef CONFIG_MAC80211_MESH
738 if (ieee80211_vif_is_mesh(&sdata->vif))
739 mesh_accept_plinks_update(sdata);
742 sta_dbg(sdata, "Removed STA %pM\n", sta->sta.addr);
744 cancel_work_sync(&sta->drv_unblock_wk);
746 cfg80211_del_sta(sdata->dev, sta->sta.addr, GFP_KERNEL);
748 rate_control_remove_sta_debugfs(sta);
749 ieee80211_sta_debugfs_remove(sta);
751 #ifdef CONFIG_MAC80211_MESH
752 if (ieee80211_vif_is_mesh(&sta->sdata->vif)) {
753 mesh_plink_deactivate(sta);
754 del_timer_sync(&sta->plink_timer);
759 * Destroy aggregation state here. It would be nice to wait for the
760 * driver to finish aggregation stop and then clean up, but for now
761 * drivers have to handle aggregation stop being requested, followed
762 * directly by station destruction.
764 for (i = 0; i < STA_TID_NUM; i++) {
765 tid_tx = rcu_dereference_raw(sta->ampdu_mlme.tid_tx[i]);
768 __skb_queue_purge(&tid_tx->pending);
772 sta_info_free(local, sta);
777 int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, const u8 *addr)
779 struct sta_info *sta;
782 mutex_lock(&sdata->local->sta_mtx);
783 sta = sta_info_get(sdata, addr);
784 ret = __sta_info_destroy(sta);
785 mutex_unlock(&sdata->local->sta_mtx);
790 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
793 struct sta_info *sta;
796 mutex_lock(&sdata->local->sta_mtx);
797 sta = sta_info_get_bss(sdata, addr);
798 ret = __sta_info_destroy(sta);
799 mutex_unlock(&sdata->local->sta_mtx);
804 static void sta_info_cleanup(unsigned long data)
806 struct ieee80211_local *local = (struct ieee80211_local *) data;
807 struct sta_info *sta;
808 bool timer_needed = false;
811 list_for_each_entry_rcu(sta, &local->sta_list, list)
812 if (sta_info_cleanup_expire_buffered(local, sta))
816 if (local->quiescing)
822 mod_timer(&local->sta_cleanup,
823 round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL));
826 void sta_info_init(struct ieee80211_local *local)
828 spin_lock_init(&local->tim_lock);
829 mutex_init(&local->sta_mtx);
830 INIT_LIST_HEAD(&local->sta_list);
832 setup_timer(&local->sta_cleanup, sta_info_cleanup,
833 (unsigned long)local);
836 void sta_info_stop(struct ieee80211_local *local)
838 del_timer(&local->sta_cleanup);
839 sta_info_flush(local, NULL);
843 * sta_info_flush - flush matching STA entries from the STA table
845 * Returns the number of removed STA entries.
847 * @local: local interface data
848 * @sdata: matching rule for the net device (sta->dev) or %NULL to match all STAs
850 int sta_info_flush(struct ieee80211_local *local,
851 struct ieee80211_sub_if_data *sdata)
853 struct sta_info *sta, *tmp;
858 mutex_lock(&local->sta_mtx);
859 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
860 if (!sdata || sdata == sta->sdata) {
861 WARN_ON(__sta_info_destroy(sta));
865 mutex_unlock(&local->sta_mtx);
870 void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
871 unsigned long exp_time)
873 struct ieee80211_local *local = sdata->local;
874 struct sta_info *sta, *tmp;
876 mutex_lock(&local->sta_mtx);
878 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
879 if (sdata != sta->sdata)
882 if (time_after(jiffies, sta->last_rx + exp_time)) {
883 ibss_dbg(sdata, "expiring inactive STA %pM\n",
885 WARN_ON(__sta_info_destroy(sta));
889 mutex_unlock(&local->sta_mtx);
892 struct ieee80211_sta *ieee80211_find_sta_by_ifaddr(struct ieee80211_hw *hw,
896 struct sta_info *sta, *nxt;
899 * Just return a random station if localaddr is NULL
902 for_each_sta_info(hw_to_local(hw), addr, sta, nxt) {
904 !ether_addr_equal(sta->sdata->vif.addr, localaddr))
913 EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr);
915 struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif,
918 struct sta_info *sta;
923 sta = sta_info_get_bss(vif_to_sdata(vif), addr);
932 EXPORT_SYMBOL(ieee80211_find_sta);
934 static void clear_sta_ps_flags(void *_sta)
936 struct sta_info *sta = _sta;
937 struct ieee80211_sub_if_data *sdata = sta->sdata;
939 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
940 if (test_and_clear_sta_flag(sta, WLAN_STA_PS_STA))
941 atomic_dec(&sdata->bss->num_sta_ps);
944 /* powersave support code */
945 void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta)
947 struct ieee80211_sub_if_data *sdata = sta->sdata;
948 struct ieee80211_local *local = sdata->local;
949 struct sk_buff_head pending;
950 int filtered = 0, buffered = 0, ac;
952 clear_sta_flag(sta, WLAN_STA_SP);
954 BUILD_BUG_ON(BITS_TO_LONGS(STA_TID_NUM) > 1);
955 sta->driver_buffered_tids = 0;
957 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
958 drv_sta_notify(local, sdata, STA_NOTIFY_AWAKE, &sta->sta);
960 skb_queue_head_init(&pending);
962 /* Send all buffered frames to the station */
963 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
964 int count = skb_queue_len(&pending), tmp;
966 skb_queue_splice_tail_init(&sta->tx_filtered[ac], &pending);
967 tmp = skb_queue_len(&pending);
968 filtered += tmp - count;
971 skb_queue_splice_tail_init(&sta->ps_tx_buf[ac], &pending);
972 tmp = skb_queue_len(&pending);
973 buffered += tmp - count;
976 ieee80211_add_pending_skbs_fn(local, &pending, clear_sta_ps_flags, sta);
978 local->total_ps_buffered -= buffered;
980 sta_info_recalc_tim(sta);
983 "STA %pM aid %d sending %d filtered/%d PS frames since STA not sleeping anymore\n",
984 sta->sta.addr, sta->sta.aid, filtered, buffered);
987 static void ieee80211_send_null_response(struct ieee80211_sub_if_data *sdata,
988 struct sta_info *sta, int tid,
989 enum ieee80211_frame_release_type reason)
991 struct ieee80211_local *local = sdata->local;
992 struct ieee80211_qos_hdr *nullfunc;
994 int size = sizeof(*nullfunc);
996 bool qos = test_sta_flag(sta, WLAN_STA_WME);
997 struct ieee80211_tx_info *info;
1000 fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1001 IEEE80211_STYPE_QOS_NULLFUNC |
1002 IEEE80211_FCTL_FROMDS);
1005 fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1006 IEEE80211_STYPE_NULLFUNC |
1007 IEEE80211_FCTL_FROMDS);
1010 skb = dev_alloc_skb(local->hw.extra_tx_headroom + size);
1014 skb_reserve(skb, local->hw.extra_tx_headroom);
1016 nullfunc = (void *) skb_put(skb, size);
1017 nullfunc->frame_control = fc;
1018 nullfunc->duration_id = 0;
1019 memcpy(nullfunc->addr1, sta->sta.addr, ETH_ALEN);
1020 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
1021 memcpy(nullfunc->addr3, sdata->vif.addr, ETH_ALEN);
1023 skb->priority = tid;
1024 skb_set_queue_mapping(skb, ieee802_1d_to_ac[tid]);
1026 nullfunc->qos_ctrl = cpu_to_le16(tid);
1028 if (reason == IEEE80211_FRAME_RELEASE_UAPSD)
1029 nullfunc->qos_ctrl |=
1030 cpu_to_le16(IEEE80211_QOS_CTL_EOSP);
1033 info = IEEE80211_SKB_CB(skb);
1036 * Tell TX path to send this frame even though the
1037 * STA may still remain is PS mode after this frame
1038 * exchange. Also set EOSP to indicate this packet
1039 * ends the poll/service period.
1041 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER |
1042 IEEE80211_TX_STATUS_EOSP |
1043 IEEE80211_TX_CTL_REQ_TX_STATUS;
1045 drv_allow_buffered_frames(local, sta, BIT(tid), 1, reason, false);
1047 ieee80211_xmit(sdata, skb);
1051 ieee80211_sta_ps_deliver_response(struct sta_info *sta,
1052 int n_frames, u8 ignored_acs,
1053 enum ieee80211_frame_release_type reason)
1055 struct ieee80211_sub_if_data *sdata = sta->sdata;
1056 struct ieee80211_local *local = sdata->local;
1058 bool more_data = false;
1060 unsigned long driver_release_tids = 0;
1061 struct sk_buff_head frames;
1063 /* Service or PS-Poll period starts */
1064 set_sta_flag(sta, WLAN_STA_SP);
1066 __skb_queue_head_init(&frames);
1069 * Get response frame(s) and more data bit for it.
1071 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1074 if (ignored_acs & BIT(ac))
1077 tids = ieee80211_tids_for_ac(ac);
1080 driver_release_tids = sta->driver_buffered_tids & tids;
1081 if (driver_release_tids) {
1084 struct sk_buff *skb;
1086 while (n_frames > 0) {
1087 skb = skb_dequeue(&sta->tx_filtered[ac]);
1090 &sta->ps_tx_buf[ac]);
1092 local->total_ps_buffered--;
1098 __skb_queue_tail(&frames, skb);
1103 * If the driver has data on more than one TID then
1104 * certainly there's more data if we release just a
1105 * single frame now (from a single TID).
1107 if (reason == IEEE80211_FRAME_RELEASE_PSPOLL &&
1108 hweight16(driver_release_tids) > 1) {
1110 driver_release_tids =
1111 BIT(ffs(driver_release_tids) - 1);
1116 if (!skb_queue_empty(&sta->tx_filtered[ac]) ||
1117 !skb_queue_empty(&sta->ps_tx_buf[ac])) {
1127 * For PS-Poll, this can only happen due to a race condition
1128 * when we set the TIM bit and the station notices it, but
1129 * before it can poll for the frame we expire it.
1131 * For uAPSD, this is said in the standard (11.2.1.5 h):
1132 * At each unscheduled SP for a non-AP STA, the AP shall
1133 * attempt to transmit at least one MSDU or MMPDU, but no
1134 * more than the value specified in the Max SP Length field
1135 * in the QoS Capability element from delivery-enabled ACs,
1136 * that are destined for the non-AP STA.
1138 * Since we have no other MSDU/MMPDU, transmit a QoS null frame.
1141 /* This will evaluate to 1, 3, 5 or 7. */
1142 tid = 7 - ((ffs(~ignored_acs) - 1) << 1);
1144 ieee80211_send_null_response(sdata, sta, tid, reason);
1148 if (!driver_release_tids) {
1149 struct sk_buff_head pending;
1150 struct sk_buff *skb;
1154 skb_queue_head_init(&pending);
1156 while ((skb = __skb_dequeue(&frames))) {
1157 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1158 struct ieee80211_hdr *hdr = (void *) skb->data;
1164 * Tell TX path to send this frame even though the
1165 * STA may still remain is PS mode after this frame
1168 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
1171 * Use MoreData flag to indicate whether there are
1172 * more buffered frames for this STA
1174 if (more_data || !skb_queue_empty(&frames))
1175 hdr->frame_control |=
1176 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1178 hdr->frame_control &=
1179 cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
1181 if (ieee80211_is_data_qos(hdr->frame_control) ||
1182 ieee80211_is_qos_nullfunc(hdr->frame_control))
1183 qoshdr = ieee80211_get_qos_ctl(hdr);
1185 /* end service period after last frame */
1186 if (skb_queue_empty(&frames)) {
1187 if (reason == IEEE80211_FRAME_RELEASE_UAPSD &&
1189 *qoshdr |= IEEE80211_QOS_CTL_EOSP;
1191 info->flags |= IEEE80211_TX_STATUS_EOSP |
1192 IEEE80211_TX_CTL_REQ_TX_STATUS;
1196 tids |= BIT(*qoshdr & IEEE80211_QOS_CTL_TID_MASK);
1200 __skb_queue_tail(&pending, skb);
1203 drv_allow_buffered_frames(local, sta, tids, num,
1206 ieee80211_add_pending_skbs(local, &pending);
1208 sta_info_recalc_tim(sta);
1211 * We need to release a frame that is buffered somewhere in the
1212 * driver ... it'll have to handle that.
1213 * Note that, as per the comment above, it'll also have to see
1214 * if there is more than just one frame on the specific TID that
1215 * we're releasing from, and it needs to set the more-data bit
1216 * accordingly if we tell it that there's no more data. If we do
1217 * tell it there's more data, then of course the more-data bit
1218 * needs to be set anyway.
1220 drv_release_buffered_frames(local, sta, driver_release_tids,
1221 n_frames, reason, more_data);
1224 * Note that we don't recalculate the TIM bit here as it would
1225 * most likely have no effect at all unless the driver told us
1226 * that the TID became empty before returning here from the
1228 * Either way, however, when the driver tells us that the TID
1229 * became empty we'll do the TIM recalculation.
1234 void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta)
1236 u8 ignore_for_response = sta->sta.uapsd_queues;
1239 * If all ACs are delivery-enabled then we should reply
1240 * from any of them, if only some are enabled we reply
1241 * only from the non-enabled ones.
1243 if (ignore_for_response == BIT(IEEE80211_NUM_ACS) - 1)
1244 ignore_for_response = 0;
1246 ieee80211_sta_ps_deliver_response(sta, 1, ignore_for_response,
1247 IEEE80211_FRAME_RELEASE_PSPOLL);
1250 void ieee80211_sta_ps_deliver_uapsd(struct sta_info *sta)
1252 int n_frames = sta->sta.max_sp;
1253 u8 delivery_enabled = sta->sta.uapsd_queues;
1256 * If we ever grow support for TSPEC this might happen if
1257 * the TSPEC update from hostapd comes in between a trigger
1258 * frame setting WLAN_STA_UAPSD in the RX path and this
1259 * actually getting called.
1261 if (!delivery_enabled)
1264 switch (sta->sta.max_sp) {
1275 /* XXX: what is a good value? */
1280 ieee80211_sta_ps_deliver_response(sta, n_frames, ~delivery_enabled,
1281 IEEE80211_FRAME_RELEASE_UAPSD);
1284 void ieee80211_sta_block_awake(struct ieee80211_hw *hw,
1285 struct ieee80211_sta *pubsta, bool block)
1287 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1289 trace_api_sta_block_awake(sta->local, pubsta, block);
1292 set_sta_flag(sta, WLAN_STA_PS_DRIVER);
1293 else if (test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1294 ieee80211_queue_work(hw, &sta->drv_unblock_wk);
1296 EXPORT_SYMBOL(ieee80211_sta_block_awake);
1298 void ieee80211_sta_eosp_irqsafe(struct ieee80211_sta *pubsta)
1300 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1301 struct ieee80211_local *local = sta->local;
1302 struct sk_buff *skb;
1303 struct skb_eosp_msg_data *data;
1305 trace_api_eosp(local, pubsta);
1307 skb = alloc_skb(0, GFP_ATOMIC);
1309 /* too bad ... but race is better than loss */
1310 clear_sta_flag(sta, WLAN_STA_SP);
1314 data = (void *)skb->cb;
1315 memcpy(data->sta, pubsta->addr, ETH_ALEN);
1316 memcpy(data->iface, sta->sdata->vif.addr, ETH_ALEN);
1317 skb->pkt_type = IEEE80211_EOSP_MSG;
1318 skb_queue_tail(&local->skb_queue, skb);
1319 tasklet_schedule(&local->tasklet);
1321 EXPORT_SYMBOL(ieee80211_sta_eosp_irqsafe);
1323 void ieee80211_sta_set_buffered(struct ieee80211_sta *pubsta,
1324 u8 tid, bool buffered)
1326 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1328 if (WARN_ON(tid >= STA_TID_NUM))
1332 set_bit(tid, &sta->driver_buffered_tids);
1334 clear_bit(tid, &sta->driver_buffered_tids);
1336 sta_info_recalc_tim(sta);
1338 EXPORT_SYMBOL(ieee80211_sta_set_buffered);
1340 int sta_info_move_state(struct sta_info *sta,
1341 enum ieee80211_sta_state new_state)
1345 if (sta->sta_state == new_state)
1348 /* check allowed transitions first */
1350 switch (new_state) {
1351 case IEEE80211_STA_NONE:
1352 if (sta->sta_state != IEEE80211_STA_AUTH)
1355 case IEEE80211_STA_AUTH:
1356 if (sta->sta_state != IEEE80211_STA_NONE &&
1357 sta->sta_state != IEEE80211_STA_ASSOC)
1360 case IEEE80211_STA_ASSOC:
1361 if (sta->sta_state != IEEE80211_STA_AUTH &&
1362 sta->sta_state != IEEE80211_STA_AUTHORIZED)
1365 case IEEE80211_STA_AUTHORIZED:
1366 if (sta->sta_state != IEEE80211_STA_ASSOC)
1370 WARN(1, "invalid state %d", new_state);
1374 sta_dbg(sta->sdata, "moving STA %pM to state %d\n",
1375 sta->sta.addr, new_state);
1378 * notify the driver before the actual changes so it can
1379 * fail the transition
1381 if (test_sta_flag(sta, WLAN_STA_INSERTED)) {
1382 int err = drv_sta_state(sta->local, sta->sdata, sta,
1383 sta->sta_state, new_state);
1388 /* reflect the change in all state variables */
1390 switch (new_state) {
1391 case IEEE80211_STA_NONE:
1392 if (sta->sta_state == IEEE80211_STA_AUTH)
1393 clear_bit(WLAN_STA_AUTH, &sta->_flags);
1395 case IEEE80211_STA_AUTH:
1396 if (sta->sta_state == IEEE80211_STA_NONE)
1397 set_bit(WLAN_STA_AUTH, &sta->_flags);
1398 else if (sta->sta_state == IEEE80211_STA_ASSOC)
1399 clear_bit(WLAN_STA_ASSOC, &sta->_flags);
1401 case IEEE80211_STA_ASSOC:
1402 if (sta->sta_state == IEEE80211_STA_AUTH) {
1403 set_bit(WLAN_STA_ASSOC, &sta->_flags);
1404 } else if (sta->sta_state == IEEE80211_STA_AUTHORIZED) {
1405 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1406 (sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1407 !sta->sdata->u.vlan.sta))
1408 atomic_dec(&sta->sdata->bss->num_mcast_sta);
1409 clear_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
1412 case IEEE80211_STA_AUTHORIZED:
1413 if (sta->sta_state == IEEE80211_STA_ASSOC) {
1414 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1415 (sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1416 !sta->sdata->u.vlan.sta))
1417 atomic_inc(&sta->sdata->bss->num_mcast_sta);
1418 set_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
1425 sta->sta_state = new_state;