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/netdevice.h>
13 #include <linux/types.h>
14 #include <linux/slab.h>
15 #include <linux/skbuff.h>
16 #include <linux/if_arp.h>
17 #include <linux/timer.h>
18 #include <linux/rtnetlink.h>
20 #include <net/mac80211.h>
21 #include "ieee80211_i.h"
22 #include "driver-ops.h"
25 #include "debugfs_sta.h"
30 * DOC: STA information lifetime rules
32 * STA info structures (&struct sta_info) are managed in a hash table
33 * for faster lookup and a list for iteration. They are managed using
34 * RCU, i.e. access to the list and hash table is protected by RCU.
36 * Upon allocating a STA info structure with sta_info_alloc(), the caller
37 * owns that structure. It must then insert it into the hash table using
38 * either sta_info_insert() or sta_info_insert_rcu(); only in the latter
39 * case (which acquires an rcu read section but must not be called from
40 * within one) will the pointer still be valid after the call. Note that
41 * the caller may not do much with the STA info before inserting it, in
42 * particular, it may not start any mesh peer link management or add
45 * When the insertion fails (sta_info_insert()) returns non-zero), the
46 * structure will have been freed by sta_info_insert()!
48 * Station entries are added by mac80211 when you establish a link with a
49 * peer. This means different things for the different type of interfaces
50 * we support. For a regular station this mean we add the AP sta when we
51 * receive an association response from the AP. For IBSS this occurs when
52 * get to know about a peer on the same IBSS. For WDS we add the sta for
53 * the peer immediately upon device open. When using AP mode we add stations
54 * for each respective station upon request from userspace through nl80211.
56 * In order to remove a STA info structure, various sta_info_destroy_*()
57 * calls are available.
59 * There is no concept of ownership on a STA entry, each structure is
60 * owned by the global hash table/list until it is removed. All users of
61 * the structure need to be RCU protected so that the structure won't be
62 * freed before they are done using it.
65 /* Caller must hold local->sta_mtx */
66 static int sta_info_hash_del(struct ieee80211_local
*local
,
71 s
= rcu_dereference_protected(local
->sta_hash
[STA_HASH(sta
->sta
.addr
)],
72 lockdep_is_held(&local
->sta_mtx
));
76 RCU_INIT_POINTER(local
->sta_hash
[STA_HASH(sta
->sta
.addr
)],
81 while (rcu_access_pointer(s
->hnext
) &&
82 rcu_access_pointer(s
->hnext
) != sta
)
83 s
= rcu_dereference_protected(s
->hnext
,
84 lockdep_is_held(&local
->sta_mtx
));
85 if (rcu_access_pointer(s
->hnext
)) {
86 RCU_INIT_POINTER(s
->hnext
, sta
->hnext
);
93 /* protected by RCU */
94 struct sta_info
*sta_info_get(struct ieee80211_sub_if_data
*sdata
,
97 struct ieee80211_local
*local
= sdata
->local
;
100 sta
= rcu_dereference_check(local
->sta_hash
[STA_HASH(addr
)],
101 lockdep_is_held(&local
->sta_mtx
));
103 if (sta
->sdata
== sdata
&& !sta
->dummy
&&
104 memcmp(sta
->sta
.addr
, addr
, ETH_ALEN
) == 0)
106 sta
= rcu_dereference_check(sta
->hnext
,
107 lockdep_is_held(&local
->sta_mtx
));
112 /* get a station info entry even if it is a dummy station*/
113 struct sta_info
*sta_info_get_rx(struct ieee80211_sub_if_data
*sdata
,
116 struct ieee80211_local
*local
= sdata
->local
;
117 struct sta_info
*sta
;
119 sta
= rcu_dereference_check(local
->sta_hash
[STA_HASH(addr
)],
120 lockdep_is_held(&local
->sta_mtx
));
122 if (sta
->sdata
== sdata
&&
123 memcmp(sta
->sta
.addr
, addr
, ETH_ALEN
) == 0)
125 sta
= rcu_dereference_check(sta
->hnext
,
126 lockdep_is_held(&local
->sta_mtx
));
132 * Get sta info either from the specified interface
133 * or from one of its vlans
135 struct sta_info
*sta_info_get_bss(struct ieee80211_sub_if_data
*sdata
,
138 struct ieee80211_local
*local
= sdata
->local
;
139 struct sta_info
*sta
;
141 sta
= rcu_dereference_check(local
->sta_hash
[STA_HASH(addr
)],
142 lockdep_is_held(&local
->sta_mtx
));
144 if ((sta
->sdata
== sdata
||
145 (sta
->sdata
->bss
&& sta
->sdata
->bss
== sdata
->bss
)) &&
147 memcmp(sta
->sta
.addr
, addr
, ETH_ALEN
) == 0)
149 sta
= rcu_dereference_check(sta
->hnext
,
150 lockdep_is_held(&local
->sta_mtx
));
156 * Get sta info either from the specified interface
157 * or from one of its vlans (including dummy stations)
159 struct sta_info
*sta_info_get_bss_rx(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 (sta
->sdata
->bss
&& sta
->sdata
->bss
== sdata
->bss
)) &&
170 memcmp(sta
->sta
.addr
, addr
, ETH_ALEN
) == 0)
172 sta
= rcu_dereference_check(sta
->hnext
,
173 lockdep_is_held(&local
->sta_mtx
));
178 struct sta_info
*sta_info_get_by_idx(struct ieee80211_sub_if_data
*sdata
,
181 struct ieee80211_local
*local
= sdata
->local
;
182 struct sta_info
*sta
;
185 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
) {
186 if (sdata
!= sta
->sdata
)
199 * sta_info_free - free STA
201 * @local: pointer to the global information
202 * @sta: STA info to free
204 * This function must undo everything done by sta_info_alloc()
205 * that may happen before sta_info_insert(). It may only be
206 * called when sta_info_insert() has not been attempted (and
207 * if that fails, the station is freed anyway.)
209 void sta_info_free(struct ieee80211_local
*local
, struct sta_info
*sta
)
211 if (sta
->rate_ctrl
) {
212 rate_control_free_sta(sta
);
213 rate_control_put(sta
->rate_ctrl
);
216 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
217 wiphy_debug(local
->hw
.wiphy
, "Destroyed STA %pM\n", sta
->sta
.addr
);
218 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
223 /* Caller must hold local->sta_mtx */
224 static void sta_info_hash_add(struct ieee80211_local
*local
,
225 struct sta_info
*sta
)
227 lockdep_assert_held(&local
->sta_mtx
);
228 sta
->hnext
= local
->sta_hash
[STA_HASH(sta
->sta
.addr
)];
229 RCU_INIT_POINTER(local
->sta_hash
[STA_HASH(sta
->sta
.addr
)], sta
);
232 static void sta_unblock(struct work_struct
*wk
)
234 struct sta_info
*sta
;
236 sta
= container_of(wk
, struct sta_info
, drv_unblock_wk
);
241 if (!test_sta_flag(sta
, WLAN_STA_PS_STA
))
242 ieee80211_sta_ps_deliver_wakeup(sta
);
243 else if (test_and_clear_sta_flag(sta
, WLAN_STA_PSPOLL
)) {
244 clear_sta_flag(sta
, WLAN_STA_PS_DRIVER
);
247 ieee80211_sta_ps_deliver_poll_response(sta
);
249 } else if (test_and_clear_sta_flag(sta
, WLAN_STA_UAPSD
)) {
250 clear_sta_flag(sta
, WLAN_STA_PS_DRIVER
);
253 ieee80211_sta_ps_deliver_uapsd(sta
);
256 clear_sta_flag(sta
, WLAN_STA_PS_DRIVER
);
259 static int sta_prepare_rate_control(struct ieee80211_local
*local
,
260 struct sta_info
*sta
, gfp_t gfp
)
262 if (local
->hw
.flags
& IEEE80211_HW_HAS_RATE_CONTROL
)
265 sta
->rate_ctrl
= rate_control_get(local
->rate_ctrl
);
266 sta
->rate_ctrl_priv
= rate_control_alloc_sta(sta
->rate_ctrl
,
268 if (!sta
->rate_ctrl_priv
) {
269 rate_control_put(sta
->rate_ctrl
);
276 struct sta_info
*sta_info_alloc(struct ieee80211_sub_if_data
*sdata
,
277 const u8
*addr
, gfp_t gfp
)
279 struct ieee80211_local
*local
= sdata
->local
;
280 struct sta_info
*sta
;
281 struct timespec uptime
;
284 sta
= kzalloc(sizeof(*sta
) + local
->hw
.sta_data_size
, gfp
);
288 spin_lock_init(&sta
->lock
);
289 INIT_WORK(&sta
->drv_unblock_wk
, sta_unblock
);
290 INIT_WORK(&sta
->ampdu_mlme
.work
, ieee80211_ba_session_work
);
291 mutex_init(&sta
->ampdu_mlme
.mtx
);
293 memcpy(sta
->sta
.addr
, addr
, ETH_ALEN
);
296 sta
->last_rx
= jiffies
;
298 do_posix_clock_monotonic_gettime(&uptime
);
299 sta
->last_connected
= uptime
.tv_sec
;
300 ewma_init(&sta
->avg_signal
, 1024, 8);
302 if (sta_prepare_rate_control(local
, sta
, gfp
)) {
307 for (i
= 0; i
< STA_TID_NUM
; i
++) {
309 * timer_to_tid must be initialized with identity mapping
310 * to enable session_timer's data differentiation. See
311 * sta_rx_agg_session_timer_expired for usage.
313 sta
->timer_to_tid
[i
] = i
;
315 for (i
= 0; i
< IEEE80211_NUM_ACS
; i
++) {
316 skb_queue_head_init(&sta
->ps_tx_buf
[i
]);
317 skb_queue_head_init(&sta
->tx_filtered
[i
]);
320 for (i
= 0; i
< NUM_RX_DATA_QUEUES
; i
++)
321 sta
->last_seq_ctrl
[i
] = cpu_to_le16(USHRT_MAX
);
323 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
324 wiphy_debug(local
->hw
.wiphy
, "Allocated STA %pM\n", sta
->sta
.addr
);
325 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
327 #ifdef CONFIG_MAC80211_MESH
328 sta
->plink_state
= NL80211_PLINK_LISTEN
;
329 init_timer(&sta
->plink_timer
);
335 static int sta_info_insert_check(struct sta_info
*sta
)
337 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
340 * Can't be a WARN_ON because it can be triggered through a race:
341 * something inserts a STA (on one CPU) without holding the RTNL
342 * and another CPU turns off the net device.
344 if (unlikely(!ieee80211_sdata_running(sdata
)))
347 if (WARN_ON(compare_ether_addr(sta
->sta
.addr
, sdata
->vif
.addr
) == 0 ||
348 is_multicast_ether_addr(sta
->sta
.addr
)))
355 * should be called with sta_mtx locked
356 * this function replaces the mutex lock
359 static int sta_info_insert_finish(struct sta_info
*sta
) __acquires(RCU
)
361 struct ieee80211_local
*local
= sta
->local
;
362 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
363 struct sta_info
*exist_sta
;
364 bool dummy_reinsert
= false;
367 lockdep_assert_held(&local
->sta_mtx
);
370 * check if STA exists already.
371 * only accept a scenario of a second call to sta_info_insert_finish
372 * with a dummy station entry that was inserted earlier
373 * in that case - assume that the dummy station flag should
376 exist_sta
= sta_info_get_bss_rx(sdata
, sta
->sta
.addr
);
378 if (exist_sta
== sta
&& sta
->dummy
) {
379 dummy_reinsert
= true;
386 if (!sta
->dummy
|| dummy_reinsert
) {
388 err
= drv_sta_add(local
, sdata
, &sta
->sta
);
390 if (sdata
->vif
.type
!= NL80211_IFTYPE_ADHOC
)
392 printk(KERN_DEBUG
"%s: failed to add IBSS STA %pM to "
393 "driver (%d) - keeping it anyway.\n",
394 sdata
->name
, sta
->sta
.addr
, err
);
396 sta
->uploaded
= true;
399 if (!dummy_reinsert
) {
401 local
->sta_generation
++;
404 /* make the station visible */
405 sta_info_hash_add(local
, sta
);
407 list_add(&sta
->list
, &local
->sta_list
);
413 struct station_info sinfo
;
415 ieee80211_sta_debugfs_add(sta
);
416 rate_control_add_sta_debugfs(sta
);
418 memset(&sinfo
, 0, sizeof(sinfo
));
420 sinfo
.generation
= local
->sta_generation
;
421 cfg80211_new_sta(sdata
->dev
, sta
->sta
.addr
, &sinfo
, GFP_KERNEL
);
424 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
425 wiphy_debug(local
->hw
.wiphy
, "Inserted %sSTA %pM\n",
426 sta
->dummy
? "dummy " : "", sta
->sta
.addr
);
427 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
429 /* move reference to rcu-protected */
431 mutex_unlock(&local
->sta_mtx
);
433 if (ieee80211_vif_is_mesh(&sdata
->vif
))
434 mesh_accept_plinks_update(sdata
);
438 mutex_unlock(&local
->sta_mtx
);
443 int sta_info_insert_rcu(struct sta_info
*sta
) __acquires(RCU
)
445 struct ieee80211_local
*local
= sta
->local
;
450 err
= sta_info_insert_check(sta
);
456 mutex_lock(&local
->sta_mtx
);
458 err
= sta_info_insert_finish(sta
);
465 sta_info_free(local
, sta
);
469 int sta_info_insert(struct sta_info
*sta
)
471 int err
= sta_info_insert_rcu(sta
);
478 /* Caller must hold sta->local->sta_mtx */
479 int sta_info_reinsert(struct sta_info
*sta
)
481 struct ieee80211_local
*local
= sta
->local
;
484 err
= sta_info_insert_check(sta
);
486 mutex_unlock(&local
->sta_mtx
);
492 err
= sta_info_insert_finish(sta
);
497 static inline void __bss_tim_set(struct ieee80211_if_ap
*bss
, u16 aid
)
500 * This format has been mandated by the IEEE specifications,
501 * so this line may not be changed to use the __set_bit() format.
503 bss
->tim
[aid
/ 8] |= (1 << (aid
% 8));
506 static inline void __bss_tim_clear(struct ieee80211_if_ap
*bss
, u16 aid
)
509 * This format has been mandated by the IEEE specifications,
510 * so this line may not be changed to use the __clear_bit() format.
512 bss
->tim
[aid
/ 8] &= ~(1 << (aid
% 8));
515 static unsigned long ieee80211_tids_for_ac(int ac
)
517 /* If we ever support TIDs > 7, this obviously needs to be adjusted */
519 case IEEE80211_AC_VO
:
520 return BIT(6) | BIT(7);
521 case IEEE80211_AC_VI
:
522 return BIT(4) | BIT(5);
523 case IEEE80211_AC_BE
:
524 return BIT(0) | BIT(3);
525 case IEEE80211_AC_BK
:
526 return BIT(1) | BIT(2);
533 void sta_info_recalc_tim(struct sta_info
*sta
)
535 struct ieee80211_local
*local
= sta
->local
;
536 struct ieee80211_if_ap
*bss
= sta
->sdata
->bss
;
538 bool indicate_tim
= false;
539 u8 ignore_for_tim
= sta
->sta
.uapsd_queues
;
542 if (WARN_ON_ONCE(!sta
->sdata
->bss
))
545 /* No need to do anything if the driver does all */
546 if (local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
)
553 * If all ACs are delivery-enabled then we should build
554 * the TIM bit for all ACs anyway; if only some are then
555 * we ignore those and build the TIM bit using only the
558 if (ignore_for_tim
== BIT(IEEE80211_NUM_ACS
) - 1)
561 for (ac
= 0; ac
< IEEE80211_NUM_ACS
; ac
++) {
564 if (ignore_for_tim
& BIT(ac
))
567 indicate_tim
|= !skb_queue_empty(&sta
->tx_filtered
[ac
]) ||
568 !skb_queue_empty(&sta
->ps_tx_buf
[ac
]);
572 tids
= ieee80211_tids_for_ac(ac
);
575 sta
->driver_buffered_tids
& tids
;
579 spin_lock_irqsave(&local
->tim_lock
, flags
);
582 __bss_tim_set(bss
, sta
->sta
.aid
);
584 __bss_tim_clear(bss
, sta
->sta
.aid
);
586 if (local
->ops
->set_tim
) {
587 local
->tim_in_locked_section
= true;
588 drv_set_tim(local
, &sta
->sta
, indicate_tim
);
589 local
->tim_in_locked_section
= false;
592 spin_unlock_irqrestore(&local
->tim_lock
, flags
);
595 static bool sta_info_buffer_expired(struct sta_info
*sta
, struct sk_buff
*skb
)
597 struct ieee80211_tx_info
*info
;
603 info
= IEEE80211_SKB_CB(skb
);
605 /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
606 timeout
= (sta
->listen_interval
*
607 sta
->sdata
->vif
.bss_conf
.beacon_int
*
609 if (timeout
< STA_TX_BUFFER_EXPIRE
)
610 timeout
= STA_TX_BUFFER_EXPIRE
;
611 return time_after(jiffies
, info
->control
.jiffies
+ timeout
);
615 static bool sta_info_cleanup_expire_buffered_ac(struct ieee80211_local
*local
,
616 struct sta_info
*sta
, int ac
)
622 * First check for frames that should expire on the filtered
623 * queue. Frames here were rejected by the driver and are on
624 * a separate queue to avoid reordering with normal PS-buffered
625 * frames. They also aren't accounted for right now in the
626 * total_ps_buffered counter.
629 spin_lock_irqsave(&sta
->tx_filtered
[ac
].lock
, flags
);
630 skb
= skb_peek(&sta
->tx_filtered
[ac
]);
631 if (sta_info_buffer_expired(sta
, skb
))
632 skb
= __skb_dequeue(&sta
->tx_filtered
[ac
]);
635 spin_unlock_irqrestore(&sta
->tx_filtered
[ac
].lock
, flags
);
638 * Frames are queued in order, so if this one
639 * hasn't expired yet we can stop testing. If
640 * we actually reached the end of the queue we
641 * also need to stop, of course.
649 * Now also check the normal PS-buffered queue, this will
650 * only find something if the filtered queue was emptied
651 * since the filtered frames are all before the normal PS
655 spin_lock_irqsave(&sta
->ps_tx_buf
[ac
].lock
, flags
);
656 skb
= skb_peek(&sta
->ps_tx_buf
[ac
]);
657 if (sta_info_buffer_expired(sta
, skb
))
658 skb
= __skb_dequeue(&sta
->ps_tx_buf
[ac
]);
661 spin_unlock_irqrestore(&sta
->ps_tx_buf
[ac
].lock
, flags
);
664 * frames are queued in order, so if this one
665 * hasn't expired yet (or we reached the end of
666 * the queue) we can stop testing
671 local
->total_ps_buffered
--;
672 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
673 printk(KERN_DEBUG
"Buffered frame expired (STA %pM)\n",
680 * Finally, recalculate the TIM bit for this station -- it might
681 * now be clear because the station was too slow to retrieve its
684 sta_info_recalc_tim(sta
);
687 * Return whether there are any frames still buffered, this is
688 * used to check whether the cleanup timer still needs to run,
689 * if there are no frames we don't need to rearm the timer.
691 return !(skb_queue_empty(&sta
->ps_tx_buf
[ac
]) &&
692 skb_queue_empty(&sta
->tx_filtered
[ac
]));
695 static bool sta_info_cleanup_expire_buffered(struct ieee80211_local
*local
,
696 struct sta_info
*sta
)
698 bool have_buffered
= false;
701 /* This is only necessary for stations on BSS interfaces */
702 if (!sta
->sdata
->bss
)
705 for (ac
= 0; ac
< IEEE80211_NUM_ACS
; ac
++)
707 sta_info_cleanup_expire_buffered_ac(local
, sta
, ac
);
709 return have_buffered
;
712 static int __must_check
__sta_info_destroy(struct sta_info
*sta
)
714 struct ieee80211_local
*local
;
715 struct ieee80211_sub_if_data
*sdata
;
717 struct tid_ampdu_tx
*tid_tx
;
728 * Before removing the station from the driver and
729 * rate control, it might still start new aggregation
730 * sessions -- block that to make sure the tear-down
731 * will be sufficient.
733 set_sta_flag(sta
, WLAN_STA_BLOCK_BA
);
734 ieee80211_sta_tear_down_BA_sessions(sta
, true);
736 ret
= sta_info_hash_del(local
, sta
);
740 list_del(&sta
->list
);
742 mutex_lock(&local
->key_mtx
);
743 for (i
= 0; i
< NUM_DEFAULT_KEYS
; i
++)
744 __ieee80211_key_free(key_mtx_dereference(local
, sta
->gtk
[i
]));
746 __ieee80211_key_free(key_mtx_dereference(local
, sta
->ptk
));
747 mutex_unlock(&local
->key_mtx
);
751 if (test_sta_flag(sta
, WLAN_STA_PS_STA
) ||
752 test_sta_flag(sta
, WLAN_STA_PS_DRIVER
)) {
755 clear_sta_flag(sta
, WLAN_STA_PS_STA
);
756 clear_sta_flag(sta
, WLAN_STA_PS_DRIVER
);
758 atomic_dec(&sdata
->bss
->num_sta_ps
);
759 sta_info_recalc_tim(sta
);
763 local
->sta_generation
++;
765 if (sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
766 RCU_INIT_POINTER(sdata
->u
.vlan
.sta
, NULL
);
768 while (sta
->sta_state
> IEEE80211_STA_NONE
)
769 sta_info_move_state(sta
, sta
->sta_state
- 1);
772 if (sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
773 sdata
= container_of(sdata
->bss
,
774 struct ieee80211_sub_if_data
,
776 drv_sta_remove(local
, sdata
, &sta
->sta
);
781 * At this point, after we wait for an RCU grace period,
782 * neither mac80211 nor the driver can reference this
783 * sta struct any more except by still existing timers
784 * associated with this station that we clean up below.
788 for (ac
= 0; ac
< IEEE80211_NUM_ACS
; ac
++) {
789 local
->total_ps_buffered
-= skb_queue_len(&sta
->ps_tx_buf
[ac
]);
790 __skb_queue_purge(&sta
->ps_tx_buf
[ac
]);
791 __skb_queue_purge(&sta
->tx_filtered
[ac
]);
794 #ifdef CONFIG_MAC80211_MESH
795 if (ieee80211_vif_is_mesh(&sdata
->vif
))
796 mesh_accept_plinks_update(sdata
);
799 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
800 wiphy_debug(local
->hw
.wiphy
, "Removed STA %pM\n", sta
->sta
.addr
);
801 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
802 cancel_work_sync(&sta
->drv_unblock_wk
);
804 cfg80211_del_sta(sdata
->dev
, sta
->sta
.addr
, GFP_KERNEL
);
806 rate_control_remove_sta_debugfs(sta
);
807 ieee80211_sta_debugfs_remove(sta
);
809 #ifdef CONFIG_MAC80211_MESH
810 if (ieee80211_vif_is_mesh(&sta
->sdata
->vif
)) {
811 mesh_plink_deactivate(sta
);
812 del_timer_sync(&sta
->plink_timer
);
816 /* There could be some memory leaks because of ampdu tx pending queue
817 * not being freed before destroying the station info.
819 * Make sure that such queues are purged before freeing the station
821 * TODO: We have to somehow postpone the full destruction
822 * until the aggregation stop completes. Refer
823 * http://thread.gmane.org/gmane.linux.kernel.wireless.general/81936
825 for (i
= 0; i
< STA_TID_NUM
; i
++) {
826 if (!sta
->ampdu_mlme
.tid_tx
[i
])
828 tid_tx
= sta
->ampdu_mlme
.tid_tx
[i
];
829 if (skb_queue_len(&tid_tx
->pending
)) {
830 #ifdef CONFIG_MAC80211_HT_DEBUG
831 wiphy_debug(local
->hw
.wiphy
, "TX A-MPDU purging %d "
832 "packets for tid=%d\n",
833 skb_queue_len(&tid_tx
->pending
), i
);
834 #endif /* CONFIG_MAC80211_HT_DEBUG */
835 __skb_queue_purge(&tid_tx
->pending
);
837 kfree_rcu(tid_tx
, rcu_head
);
840 sta_info_free(local
, sta
);
845 int sta_info_destroy_addr(struct ieee80211_sub_if_data
*sdata
, const u8
*addr
)
847 struct sta_info
*sta
;
850 mutex_lock(&sdata
->local
->sta_mtx
);
851 sta
= sta_info_get_rx(sdata
, addr
);
852 ret
= __sta_info_destroy(sta
);
853 mutex_unlock(&sdata
->local
->sta_mtx
);
858 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data
*sdata
,
861 struct sta_info
*sta
;
864 mutex_lock(&sdata
->local
->sta_mtx
);
865 sta
= sta_info_get_bss_rx(sdata
, addr
);
866 ret
= __sta_info_destroy(sta
);
867 mutex_unlock(&sdata
->local
->sta_mtx
);
872 static void sta_info_cleanup(unsigned long data
)
874 struct ieee80211_local
*local
= (struct ieee80211_local
*) data
;
875 struct sta_info
*sta
;
876 bool timer_needed
= false;
879 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
)
880 if (sta_info_cleanup_expire_buffered(local
, sta
))
884 if (local
->quiescing
)
890 mod_timer(&local
->sta_cleanup
,
891 round_jiffies(jiffies
+ STA_INFO_CLEANUP_INTERVAL
));
894 void sta_info_init(struct ieee80211_local
*local
)
896 spin_lock_init(&local
->tim_lock
);
897 mutex_init(&local
->sta_mtx
);
898 INIT_LIST_HEAD(&local
->sta_list
);
900 setup_timer(&local
->sta_cleanup
, sta_info_cleanup
,
901 (unsigned long)local
);
904 void sta_info_stop(struct ieee80211_local
*local
)
906 del_timer(&local
->sta_cleanup
);
907 sta_info_flush(local
, NULL
);
911 * sta_info_flush - flush matching STA entries from the STA table
913 * Returns the number of removed STA entries.
915 * @local: local interface data
916 * @sdata: matching rule for the net device (sta->dev) or %NULL to match all STAs
918 int sta_info_flush(struct ieee80211_local
*local
,
919 struct ieee80211_sub_if_data
*sdata
)
921 struct sta_info
*sta
, *tmp
;
926 mutex_lock(&local
->sta_mtx
);
927 list_for_each_entry_safe(sta
, tmp
, &local
->sta_list
, list
) {
928 if (!sdata
|| sdata
== sta
->sdata
)
929 WARN_ON(__sta_info_destroy(sta
));
931 mutex_unlock(&local
->sta_mtx
);
936 void ieee80211_sta_expire(struct ieee80211_sub_if_data
*sdata
,
937 unsigned long exp_time
)
939 struct ieee80211_local
*local
= sdata
->local
;
940 struct sta_info
*sta
, *tmp
;
942 mutex_lock(&local
->sta_mtx
);
943 list_for_each_entry_safe(sta
, tmp
, &local
->sta_list
, list
)
944 if (time_after(jiffies
, sta
->last_rx
+ exp_time
)) {
945 #ifdef CONFIG_MAC80211_IBSS_DEBUG
946 printk(KERN_DEBUG
"%s: expiring inactive STA %pM\n",
947 sdata
->name
, sta
->sta
.addr
);
949 WARN_ON(__sta_info_destroy(sta
));
951 mutex_unlock(&local
->sta_mtx
);
954 struct ieee80211_sta
*ieee80211_find_sta_by_ifaddr(struct ieee80211_hw
*hw
,
958 struct sta_info
*sta
, *nxt
;
961 * Just return a random station if localaddr is NULL
964 for_each_sta_info(hw_to_local(hw
), addr
, sta
, nxt
) {
966 compare_ether_addr(sta
->sdata
->vif
.addr
, localaddr
) != 0)
975 EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr
);
977 struct ieee80211_sta
*ieee80211_find_sta(struct ieee80211_vif
*vif
,
980 struct sta_info
*sta
;
985 sta
= sta_info_get_bss(vif_to_sdata(vif
), addr
);
994 EXPORT_SYMBOL(ieee80211_find_sta
);
996 static void clear_sta_ps_flags(void *_sta
)
998 struct sta_info
*sta
= _sta
;
1000 clear_sta_flag(sta
, WLAN_STA_PS_DRIVER
);
1001 clear_sta_flag(sta
, WLAN_STA_PS_STA
);
1004 /* powersave support code */
1005 void ieee80211_sta_ps_deliver_wakeup(struct sta_info
*sta
)
1007 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
1008 struct ieee80211_local
*local
= sdata
->local
;
1009 struct sk_buff_head pending
;
1010 int filtered
= 0, buffered
= 0, ac
;
1012 clear_sta_flag(sta
, WLAN_STA_SP
);
1014 BUILD_BUG_ON(BITS_TO_LONGS(STA_TID_NUM
) > 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 skb_queue_splice_tail_init(&sta
->tx_filtered
[ac
], &pending
);
1027 tmp
= skb_queue_len(&pending
);
1028 filtered
+= tmp
- count
;
1031 skb_queue_splice_tail_init(&sta
->ps_tx_buf
[ac
], &pending
);
1032 tmp
= skb_queue_len(&pending
);
1033 buffered
+= tmp
- count
;
1036 ieee80211_add_pending_skbs_fn(local
, &pending
, clear_sta_ps_flags
, sta
);
1038 local
->total_ps_buffered
-= buffered
;
1040 sta_info_recalc_tim(sta
);
1042 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
1043 printk(KERN_DEBUG
"%s: STA %pM aid %d sending %d filtered/%d PS frames "
1044 "since STA not sleeping anymore\n", sdata
->name
,
1045 sta
->sta
.addr
, sta
->sta
.aid
, filtered
, buffered
);
1046 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
1049 static void ieee80211_send_null_response(struct ieee80211_sub_if_data
*sdata
,
1050 struct sta_info
*sta
, int tid
,
1051 enum ieee80211_frame_release_type reason
)
1053 struct ieee80211_local
*local
= sdata
->local
;
1054 struct ieee80211_qos_hdr
*nullfunc
;
1055 struct sk_buff
*skb
;
1056 int size
= sizeof(*nullfunc
);
1058 bool qos
= test_sta_flag(sta
, WLAN_STA_WME
);
1059 struct ieee80211_tx_info
*info
;
1062 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
|
1063 IEEE80211_STYPE_QOS_NULLFUNC
|
1064 IEEE80211_FCTL_FROMDS
);
1067 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
|
1068 IEEE80211_STYPE_NULLFUNC
|
1069 IEEE80211_FCTL_FROMDS
);
1072 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ size
);
1076 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
1078 nullfunc
= (void *) skb_put(skb
, size
);
1079 nullfunc
->frame_control
= fc
;
1080 nullfunc
->duration_id
= 0;
1081 memcpy(nullfunc
->addr1
, sta
->sta
.addr
, ETH_ALEN
);
1082 memcpy(nullfunc
->addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1083 memcpy(nullfunc
->addr3
, sdata
->vif
.addr
, ETH_ALEN
);
1085 skb
->priority
= tid
;
1086 skb_set_queue_mapping(skb
, ieee802_1d_to_ac
[tid
]);
1088 nullfunc
->qos_ctrl
= cpu_to_le16(tid
);
1090 if (reason
== IEEE80211_FRAME_RELEASE_UAPSD
)
1091 nullfunc
->qos_ctrl
|=
1092 cpu_to_le16(IEEE80211_QOS_CTL_EOSP
);
1095 info
= IEEE80211_SKB_CB(skb
);
1098 * Tell TX path to send this frame even though the
1099 * STA may still remain is PS mode after this frame
1100 * exchange. Also set EOSP to indicate this packet
1101 * ends the poll/service period.
1103 info
->flags
|= IEEE80211_TX_CTL_POLL_RESPONSE
|
1104 IEEE80211_TX_STATUS_EOSP
|
1105 IEEE80211_TX_CTL_REQ_TX_STATUS
;
1107 drv_allow_buffered_frames(local
, sta
, BIT(tid
), 1, reason
, false);
1109 ieee80211_xmit(sdata
, skb
);
1113 ieee80211_sta_ps_deliver_response(struct sta_info
*sta
,
1114 int n_frames
, u8 ignored_acs
,
1115 enum ieee80211_frame_release_type reason
)
1117 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
1118 struct ieee80211_local
*local
= sdata
->local
;
1120 bool more_data
= false;
1122 unsigned long driver_release_tids
= 0;
1123 struct sk_buff_head frames
;
1125 /* Service or PS-Poll period starts */
1126 set_sta_flag(sta
, WLAN_STA_SP
);
1128 __skb_queue_head_init(&frames
);
1131 * Get response frame(s) and more data bit for it.
1133 for (ac
= 0; ac
< IEEE80211_NUM_ACS
; ac
++) {
1136 if (ignored_acs
& BIT(ac
))
1139 tids
= ieee80211_tids_for_ac(ac
);
1142 driver_release_tids
= sta
->driver_buffered_tids
& tids
;
1143 if (driver_release_tids
) {
1146 struct sk_buff
*skb
;
1148 while (n_frames
> 0) {
1149 skb
= skb_dequeue(&sta
->tx_filtered
[ac
]);
1152 &sta
->ps_tx_buf
[ac
]);
1154 local
->total_ps_buffered
--;
1160 __skb_queue_tail(&frames
, skb
);
1165 * If the driver has data on more than one TID then
1166 * certainly there's more data if we release just a
1167 * single frame now (from a single TID).
1169 if (reason
== IEEE80211_FRAME_RELEASE_PSPOLL
&&
1170 hweight16(driver_release_tids
) > 1) {
1172 driver_release_tids
=
1173 BIT(ffs(driver_release_tids
) - 1);
1178 if (!skb_queue_empty(&sta
->tx_filtered
[ac
]) ||
1179 !skb_queue_empty(&sta
->ps_tx_buf
[ac
])) {
1189 * For PS-Poll, this can only happen due to a race condition
1190 * when we set the TIM bit and the station notices it, but
1191 * before it can poll for the frame we expire it.
1193 * For uAPSD, this is said in the standard (11.2.1.5 h):
1194 * At each unscheduled SP for a non-AP STA, the AP shall
1195 * attempt to transmit at least one MSDU or MMPDU, but no
1196 * more than the value specified in the Max SP Length field
1197 * in the QoS Capability element from delivery-enabled ACs,
1198 * that are destined for the non-AP STA.
1200 * Since we have no other MSDU/MMPDU, transmit a QoS null frame.
1203 /* This will evaluate to 1, 3, 5 or 7. */
1204 tid
= 7 - ((ffs(~ignored_acs
) - 1) << 1);
1206 ieee80211_send_null_response(sdata
, sta
, tid
, reason
);
1210 if (!driver_release_tids
) {
1211 struct sk_buff_head pending
;
1212 struct sk_buff
*skb
;
1216 skb_queue_head_init(&pending
);
1218 while ((skb
= __skb_dequeue(&frames
))) {
1219 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1220 struct ieee80211_hdr
*hdr
= (void *) skb
->data
;
1226 * Tell TX path to send this frame even though the
1227 * STA may still remain is PS mode after this frame
1230 info
->flags
|= IEEE80211_TX_CTL_POLL_RESPONSE
;
1233 * Use MoreData flag to indicate whether there are
1234 * more buffered frames for this STA
1236 if (more_data
|| !skb_queue_empty(&frames
))
1237 hdr
->frame_control
|=
1238 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
1240 hdr
->frame_control
&=
1241 cpu_to_le16(~IEEE80211_FCTL_MOREDATA
);
1243 if (ieee80211_is_data_qos(hdr
->frame_control
) ||
1244 ieee80211_is_qos_nullfunc(hdr
->frame_control
))
1245 qoshdr
= ieee80211_get_qos_ctl(hdr
);
1247 /* set EOSP for the frame */
1248 if (reason
== IEEE80211_FRAME_RELEASE_UAPSD
&&
1249 qoshdr
&& skb_queue_empty(&frames
))
1250 *qoshdr
|= IEEE80211_QOS_CTL_EOSP
;
1252 info
->flags
|= IEEE80211_TX_STATUS_EOSP
|
1253 IEEE80211_TX_CTL_REQ_TX_STATUS
;
1256 tids
|= BIT(*qoshdr
& IEEE80211_QOS_CTL_TID_MASK
);
1260 __skb_queue_tail(&pending
, skb
);
1263 drv_allow_buffered_frames(local
, sta
, tids
, num
,
1266 ieee80211_add_pending_skbs(local
, &pending
);
1268 sta_info_recalc_tim(sta
);
1271 * We need to release a frame that is buffered somewhere in the
1272 * driver ... it'll have to handle that.
1273 * Note that, as per the comment above, it'll also have to see
1274 * if there is more than just one frame on the specific TID that
1275 * we're releasing from, and it needs to set the more-data bit
1276 * accordingly if we tell it that there's no more data. If we do
1277 * tell it there's more data, then of course the more-data bit
1278 * needs to be set anyway.
1280 drv_release_buffered_frames(local
, sta
, driver_release_tids
,
1281 n_frames
, reason
, more_data
);
1284 * Note that we don't recalculate the TIM bit here as it would
1285 * most likely have no effect at all unless the driver told us
1286 * that the TID became empty before returning here from the
1288 * Either way, however, when the driver tells us that the TID
1289 * became empty we'll do the TIM recalculation.
1294 void ieee80211_sta_ps_deliver_poll_response(struct sta_info
*sta
)
1296 u8 ignore_for_response
= sta
->sta
.uapsd_queues
;
1299 * If all ACs are delivery-enabled then we should reply
1300 * from any of them, if only some are enabled we reply
1301 * only from the non-enabled ones.
1303 if (ignore_for_response
== BIT(IEEE80211_NUM_ACS
) - 1)
1304 ignore_for_response
= 0;
1306 ieee80211_sta_ps_deliver_response(sta
, 1, ignore_for_response
,
1307 IEEE80211_FRAME_RELEASE_PSPOLL
);
1310 void ieee80211_sta_ps_deliver_uapsd(struct sta_info
*sta
)
1312 int n_frames
= sta
->sta
.max_sp
;
1313 u8 delivery_enabled
= sta
->sta
.uapsd_queues
;
1316 * If we ever grow support for TSPEC this might happen if
1317 * the TSPEC update from hostapd comes in between a trigger
1318 * frame setting WLAN_STA_UAPSD in the RX path and this
1319 * actually getting called.
1321 if (!delivery_enabled
)
1324 switch (sta
->sta
.max_sp
) {
1335 /* XXX: what is a good value? */
1340 ieee80211_sta_ps_deliver_response(sta
, n_frames
, ~delivery_enabled
,
1341 IEEE80211_FRAME_RELEASE_UAPSD
);
1344 void ieee80211_sta_block_awake(struct ieee80211_hw
*hw
,
1345 struct ieee80211_sta
*pubsta
, bool block
)
1347 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
1349 trace_api_sta_block_awake(sta
->local
, pubsta
, block
);
1352 set_sta_flag(sta
, WLAN_STA_PS_DRIVER
);
1353 else if (test_sta_flag(sta
, WLAN_STA_PS_DRIVER
))
1354 ieee80211_queue_work(hw
, &sta
->drv_unblock_wk
);
1356 EXPORT_SYMBOL(ieee80211_sta_block_awake
);
1358 void ieee80211_sta_eosp_irqsafe(struct ieee80211_sta
*pubsta
)
1360 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
1361 struct ieee80211_local
*local
= sta
->local
;
1362 struct sk_buff
*skb
;
1363 struct skb_eosp_msg_data
*data
;
1365 trace_api_eosp(local
, pubsta
);
1367 skb
= alloc_skb(0, GFP_ATOMIC
);
1369 /* too bad ... but race is better than loss */
1370 clear_sta_flag(sta
, WLAN_STA_SP
);
1374 data
= (void *)skb
->cb
;
1375 memcpy(data
->sta
, pubsta
->addr
, ETH_ALEN
);
1376 memcpy(data
->iface
, sta
->sdata
->vif
.addr
, ETH_ALEN
);
1377 skb
->pkt_type
= IEEE80211_EOSP_MSG
;
1378 skb_queue_tail(&local
->skb_queue
, skb
);
1379 tasklet_schedule(&local
->tasklet
);
1381 EXPORT_SYMBOL(ieee80211_sta_eosp_irqsafe
);
1383 void ieee80211_sta_set_buffered(struct ieee80211_sta
*pubsta
,
1384 u8 tid
, bool buffered
)
1386 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
1388 if (WARN_ON(tid
>= STA_TID_NUM
))
1392 set_bit(tid
, &sta
->driver_buffered_tids
);
1394 clear_bit(tid
, &sta
->driver_buffered_tids
);
1396 sta_info_recalc_tim(sta
);
1398 EXPORT_SYMBOL(ieee80211_sta_set_buffered
);
1400 int sta_info_move_state_checked(struct sta_info
*sta
,
1401 enum ieee80211_sta_state new_state
)
1405 if (sta
->sta_state
== new_state
)
1408 switch (new_state
) {
1409 case IEEE80211_STA_NONE
:
1410 if (sta
->sta_state
== IEEE80211_STA_AUTH
)
1411 clear_bit(WLAN_STA_AUTH
, &sta
->_flags
);
1415 case IEEE80211_STA_AUTH
:
1416 if (sta
->sta_state
== IEEE80211_STA_NONE
)
1417 set_bit(WLAN_STA_AUTH
, &sta
->_flags
);
1418 else if (sta
->sta_state
== IEEE80211_STA_ASSOC
)
1419 clear_bit(WLAN_STA_ASSOC
, &sta
->_flags
);
1423 case IEEE80211_STA_ASSOC
:
1424 if (sta
->sta_state
== IEEE80211_STA_AUTH
) {
1425 set_bit(WLAN_STA_ASSOC
, &sta
->_flags
);
1426 } else if (sta
->sta_state
== IEEE80211_STA_AUTHORIZED
) {
1427 if (sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP
)
1428 atomic_dec(&sta
->sdata
->u
.ap
.num_sta_authorized
);
1429 clear_bit(WLAN_STA_AUTHORIZED
, &sta
->_flags
);
1433 case IEEE80211_STA_AUTHORIZED
:
1434 if (sta
->sta_state
== IEEE80211_STA_ASSOC
) {
1435 if (sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP
)
1436 atomic_inc(&sta
->sdata
->u
.ap
.num_sta_authorized
);
1437 set_bit(WLAN_STA_AUTHORIZED
, &sta
->_flags
);
1442 WARN(1, "invalid state %d", new_state
);
1446 printk(KERN_DEBUG
"%s: moving STA %pM to state %d\n",
1447 sta
->sdata
->name
, sta
->sta
.addr
, new_state
);
1448 sta
->sta_state
= new_state
;