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
;
104 * At this point, when being called as call_rcu callback,
105 * neither mac80211 nor the driver can reference this
106 * sta struct any more except by still existing timers
107 * associated with this station that we clean up below.
110 if (test_sta_flag(sta
, WLAN_STA_PS_STA
)) {
111 if (sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
112 sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
113 ps
= &sdata
->bss
->ps
;
117 clear_sta_flag(sta
, WLAN_STA_PS_STA
);
119 atomic_dec(&ps
->num_sta_ps
);
120 sta_info_recalc_tim(sta
);
123 for (ac
= 0; ac
< IEEE80211_NUM_ACS
; ac
++) {
124 local
->total_ps_buffered
-= skb_queue_len(&sta
->ps_tx_buf
[ac
]);
125 ieee80211_purge_tx_queue(&local
->hw
, &sta
->ps_tx_buf
[ac
]);
126 ieee80211_purge_tx_queue(&local
->hw
, &sta
->tx_filtered
[ac
]);
129 #ifdef CONFIG_MAC80211_MESH
130 if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
131 mesh_accept_plinks_update(sdata
);
132 mesh_plink_deactivate(sta
);
133 del_timer_sync(&sta
->plink_timer
);
137 cancel_work_sync(&sta
->drv_unblock_wk
);
140 * Destroy aggregation state here. It would be nice to wait for the
141 * driver to finish aggregation stop and then clean up, but for now
142 * drivers have to handle aggregation stop being requested, followed
143 * directly by station destruction.
145 for (i
= 0; i
< IEEE80211_NUM_TIDS
; i
++) {
146 tid_tx
= rcu_dereference_raw(sta
->ampdu_mlme
.tid_tx
[i
]);
149 ieee80211_purge_tx_queue(&local
->hw
, &tid_tx
->pending
);
153 sta_info_free(local
, sta
);
156 static void free_sta_rcu(struct rcu_head
*h
)
158 struct sta_info
*sta
= container_of(h
, struct sta_info
, rcu_head
);
160 ieee80211_queue_work(&sta
->local
->hw
, &sta
->free_sta_wk
);
163 /* protected by RCU */
164 struct sta_info
*sta_info_get(struct ieee80211_sub_if_data
*sdata
,
167 struct ieee80211_local
*local
= sdata
->local
;
168 struct sta_info
*sta
;
170 sta
= rcu_dereference_check(local
->sta_hash
[STA_HASH(addr
)],
171 lockdep_is_held(&local
->sta_mtx
));
173 if (sta
->sdata
== sdata
&&
174 ether_addr_equal(sta
->sta
.addr
, addr
))
176 sta
= rcu_dereference_check(sta
->hnext
,
177 lockdep_is_held(&local
->sta_mtx
));
183 * Get sta info either from the specified interface
184 * or from one of its vlans
186 struct sta_info
*sta_info_get_bss(struct ieee80211_sub_if_data
*sdata
,
189 struct ieee80211_local
*local
= sdata
->local
;
190 struct sta_info
*sta
;
192 sta
= rcu_dereference_check(local
->sta_hash
[STA_HASH(addr
)],
193 lockdep_is_held(&local
->sta_mtx
));
195 if ((sta
->sdata
== sdata
||
196 (sta
->sdata
->bss
&& sta
->sdata
->bss
== sdata
->bss
)) &&
197 ether_addr_equal(sta
->sta
.addr
, addr
))
199 sta
= rcu_dereference_check(sta
->hnext
,
200 lockdep_is_held(&local
->sta_mtx
));
205 struct sta_info
*sta_info_get_by_idx(struct ieee80211_sub_if_data
*sdata
,
208 struct ieee80211_local
*local
= sdata
->local
;
209 struct sta_info
*sta
;
212 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
) {
213 if (sdata
!= sta
->sdata
)
226 * sta_info_free - free STA
228 * @local: pointer to the global information
229 * @sta: STA info to free
231 * This function must undo everything done by sta_info_alloc()
232 * that may happen before sta_info_insert(). It may only be
233 * called when sta_info_insert() has not been attempted (and
234 * if that fails, the station is freed anyway.)
236 void sta_info_free(struct ieee80211_local
*local
, struct sta_info
*sta
)
239 rate_control_free_sta(sta
);
241 sta_dbg(sta
->sdata
, "Destroyed STA %pM\n", sta
->sta
.addr
);
246 /* Caller must hold local->sta_mtx */
247 static void sta_info_hash_add(struct ieee80211_local
*local
,
248 struct sta_info
*sta
)
250 lockdep_assert_held(&local
->sta_mtx
);
251 sta
->hnext
= local
->sta_hash
[STA_HASH(sta
->sta
.addr
)];
252 rcu_assign_pointer(local
->sta_hash
[STA_HASH(sta
->sta
.addr
)], sta
);
255 static void sta_unblock(struct work_struct
*wk
)
257 struct sta_info
*sta
;
259 sta
= container_of(wk
, struct sta_info
, drv_unblock_wk
);
264 if (!test_sta_flag(sta
, WLAN_STA_PS_STA
)) {
266 ieee80211_sta_ps_deliver_wakeup(sta
);
268 } else if (test_and_clear_sta_flag(sta
, WLAN_STA_PSPOLL
)) {
269 clear_sta_flag(sta
, WLAN_STA_PS_DRIVER
);
272 ieee80211_sta_ps_deliver_poll_response(sta
);
274 } else if (test_and_clear_sta_flag(sta
, WLAN_STA_UAPSD
)) {
275 clear_sta_flag(sta
, WLAN_STA_PS_DRIVER
);
278 ieee80211_sta_ps_deliver_uapsd(sta
);
281 clear_sta_flag(sta
, WLAN_STA_PS_DRIVER
);
284 static int sta_prepare_rate_control(struct ieee80211_local
*local
,
285 struct sta_info
*sta
, gfp_t gfp
)
287 if (local
->hw
.flags
& IEEE80211_HW_HAS_RATE_CONTROL
)
290 sta
->rate_ctrl
= local
->rate_ctrl
;
291 sta
->rate_ctrl_priv
= rate_control_alloc_sta(sta
->rate_ctrl
,
293 if (!sta
->rate_ctrl_priv
)
299 struct sta_info
*sta_info_alloc(struct ieee80211_sub_if_data
*sdata
,
300 const u8
*addr
, gfp_t gfp
)
302 struct ieee80211_local
*local
= sdata
->local
;
303 struct sta_info
*sta
;
304 struct timespec uptime
;
307 sta
= kzalloc(sizeof(*sta
) + local
->hw
.sta_data_size
, gfp
);
311 spin_lock_init(&sta
->lock
);
312 INIT_WORK(&sta
->drv_unblock_wk
, sta_unblock
);
313 INIT_WORK(&sta
->free_sta_wk
, free_sta_work
);
314 INIT_WORK(&sta
->ampdu_mlme
.work
, ieee80211_ba_session_work
);
315 mutex_init(&sta
->ampdu_mlme
.mtx
);
317 memcpy(sta
->sta
.addr
, addr
, ETH_ALEN
);
320 sta
->last_rx
= jiffies
;
322 sta
->sta_state
= IEEE80211_STA_NONE
;
324 do_posix_clock_monotonic_gettime(&uptime
);
325 sta
->last_connected
= uptime
.tv_sec
;
326 ewma_init(&sta
->avg_signal
, 1024, 8);
328 if (sta_prepare_rate_control(local
, sta
, gfp
)) {
333 for (i
= 0; i
< IEEE80211_NUM_TIDS
; i
++) {
335 * timer_to_tid must be initialized with identity mapping
336 * to enable session_timer's data differentiation. See
337 * sta_rx_agg_session_timer_expired for usage.
339 sta
->timer_to_tid
[i
] = i
;
341 for (i
= 0; i
< IEEE80211_NUM_ACS
; i
++) {
342 skb_queue_head_init(&sta
->ps_tx_buf
[i
]);
343 skb_queue_head_init(&sta
->tx_filtered
[i
]);
346 for (i
= 0; i
< IEEE80211_NUM_TIDS
; i
++)
347 sta
->last_seq_ctrl
[i
] = cpu_to_le16(USHRT_MAX
);
349 sta_dbg(sdata
, "Allocated STA %pM\n", sta
->sta
.addr
);
351 #ifdef CONFIG_MAC80211_MESH
352 sta
->plink_state
= NL80211_PLINK_LISTEN
;
353 init_timer(&sta
->plink_timer
);
359 static int sta_info_insert_check(struct sta_info
*sta
)
361 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
364 * Can't be a WARN_ON because it can be triggered through a race:
365 * something inserts a STA (on one CPU) without holding the RTNL
366 * and another CPU turns off the net device.
368 if (unlikely(!ieee80211_sdata_running(sdata
)))
371 if (WARN_ON(ether_addr_equal(sta
->sta
.addr
, sdata
->vif
.addr
) ||
372 is_multicast_ether_addr(sta
->sta
.addr
)))
378 static int sta_info_insert_drv_state(struct ieee80211_local
*local
,
379 struct ieee80211_sub_if_data
*sdata
,
380 struct sta_info
*sta
)
382 enum ieee80211_sta_state state
;
385 for (state
= IEEE80211_STA_NOTEXIST
; state
< sta
->sta_state
; state
++) {
386 err
= drv_sta_state(local
, sdata
, sta
, state
, state
+ 1);
393 * Drivers using legacy sta_add/sta_remove callbacks only
394 * get uploaded set to true after sta_add is called.
396 if (!local
->ops
->sta_add
)
397 sta
->uploaded
= true;
401 if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
403 "failed to move IBSS STA %pM to state %d (%d) - keeping it anyway\n",
404 sta
->sta
.addr
, state
+ 1, err
);
408 /* unwind on error */
409 for (; state
> IEEE80211_STA_NOTEXIST
; state
--)
410 WARN_ON(drv_sta_state(local
, sdata
, sta
, state
, state
- 1));
416 * should be called with sta_mtx locked
417 * this function replaces the mutex lock
420 static int sta_info_insert_finish(struct sta_info
*sta
) __acquires(RCU
)
422 struct ieee80211_local
*local
= sta
->local
;
423 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
424 struct station_info sinfo
;
427 lockdep_assert_held(&local
->sta_mtx
);
429 /* check if STA exists already */
430 if (sta_info_get_bss(sdata
, sta
->sta
.addr
)) {
436 err
= sta_info_insert_drv_state(local
, sdata
, sta
);
441 local
->sta_generation
++;
444 /* make the station visible */
445 sta_info_hash_add(local
, sta
);
447 list_add_rcu(&sta
->list
, &local
->sta_list
);
449 set_sta_flag(sta
, WLAN_STA_INSERTED
);
451 ieee80211_sta_debugfs_add(sta
);
452 rate_control_add_sta_debugfs(sta
);
454 memset(&sinfo
, 0, sizeof(sinfo
));
456 sinfo
.generation
= local
->sta_generation
;
457 cfg80211_new_sta(sdata
->dev
, sta
->sta
.addr
, &sinfo
, GFP_KERNEL
);
459 sta_dbg(sdata
, "Inserted STA %pM\n", sta
->sta
.addr
);
461 /* move reference to rcu-protected */
463 mutex_unlock(&local
->sta_mtx
);
465 if (ieee80211_vif_is_mesh(&sdata
->vif
))
466 mesh_accept_plinks_update(sdata
);
470 mutex_unlock(&local
->sta_mtx
);
475 int sta_info_insert_rcu(struct sta_info
*sta
) __acquires(RCU
)
477 struct ieee80211_local
*local
= sta
->local
;
482 err
= sta_info_insert_check(sta
);
488 mutex_lock(&local
->sta_mtx
);
490 err
= sta_info_insert_finish(sta
);
497 sta_info_free(local
, sta
);
501 int sta_info_insert(struct sta_info
*sta
)
503 int err
= sta_info_insert_rcu(sta
);
510 static inline void __bss_tim_set(u8
*tim
, u16 id
)
513 * This format has been mandated by the IEEE specifications,
514 * so this line may not be changed to use the __set_bit() format.
516 tim
[id
/ 8] |= (1 << (id
% 8));
519 static inline void __bss_tim_clear(u8
*tim
, u16 id
)
522 * This format has been mandated by the IEEE specifications,
523 * so this line may not be changed to use the __clear_bit() format.
525 tim
[id
/ 8] &= ~(1 << (id
% 8));
528 static unsigned long ieee80211_tids_for_ac(int ac
)
530 /* If we ever support TIDs > 7, this obviously needs to be adjusted */
532 case IEEE80211_AC_VO
:
533 return BIT(6) | BIT(7);
534 case IEEE80211_AC_VI
:
535 return BIT(4) | BIT(5);
536 case IEEE80211_AC_BE
:
537 return BIT(0) | BIT(3);
538 case IEEE80211_AC_BK
:
539 return BIT(1) | BIT(2);
546 void sta_info_recalc_tim(struct sta_info
*sta
)
548 struct ieee80211_local
*local
= sta
->local
;
551 bool indicate_tim
= false;
552 u8 ignore_for_tim
= sta
->sta
.uapsd_queues
;
556 if (sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
557 sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) {
558 if (WARN_ON_ONCE(!sta
->sdata
->bss
))
561 ps
= &sta
->sdata
->bss
->ps
;
567 /* No need to do anything if the driver does all */
568 if (local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
)
575 * If all ACs are delivery-enabled then we should build
576 * the TIM bit for all ACs anyway; if only some are then
577 * we ignore those and build the TIM bit using only the
580 if (ignore_for_tim
== BIT(IEEE80211_NUM_ACS
) - 1)
583 for (ac
= 0; ac
< IEEE80211_NUM_ACS
; ac
++) {
586 if (ignore_for_tim
& BIT(ac
))
589 indicate_tim
|= !skb_queue_empty(&sta
->tx_filtered
[ac
]) ||
590 !skb_queue_empty(&sta
->ps_tx_buf
[ac
]);
594 tids
= ieee80211_tids_for_ac(ac
);
597 sta
->driver_buffered_tids
& tids
;
601 spin_lock_irqsave(&local
->tim_lock
, flags
);
604 __bss_tim_set(ps
->tim
, id
);
606 __bss_tim_clear(ps
->tim
, id
);
608 if (local
->ops
->set_tim
) {
609 local
->tim_in_locked_section
= true;
610 drv_set_tim(local
, &sta
->sta
, indicate_tim
);
611 local
->tim_in_locked_section
= false;
614 spin_unlock_irqrestore(&local
->tim_lock
, flags
);
617 static bool sta_info_buffer_expired(struct sta_info
*sta
, struct sk_buff
*skb
)
619 struct ieee80211_tx_info
*info
;
625 info
= IEEE80211_SKB_CB(skb
);
627 /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
628 timeout
= (sta
->listen_interval
*
629 sta
->sdata
->vif
.bss_conf
.beacon_int
*
631 if (timeout
< STA_TX_BUFFER_EXPIRE
)
632 timeout
= STA_TX_BUFFER_EXPIRE
;
633 return time_after(jiffies
, info
->control
.jiffies
+ timeout
);
637 static bool sta_info_cleanup_expire_buffered_ac(struct ieee80211_local
*local
,
638 struct sta_info
*sta
, int ac
)
644 * First check for frames that should expire on the filtered
645 * queue. Frames here were rejected by the driver and are on
646 * a separate queue to avoid reordering with normal PS-buffered
647 * frames. They also aren't accounted for right now in the
648 * total_ps_buffered counter.
651 spin_lock_irqsave(&sta
->tx_filtered
[ac
].lock
, flags
);
652 skb
= skb_peek(&sta
->tx_filtered
[ac
]);
653 if (sta_info_buffer_expired(sta
, skb
))
654 skb
= __skb_dequeue(&sta
->tx_filtered
[ac
]);
657 spin_unlock_irqrestore(&sta
->tx_filtered
[ac
].lock
, flags
);
660 * Frames are queued in order, so if this one
661 * hasn't expired yet we can stop testing. If
662 * we actually reached the end of the queue we
663 * also need to stop, of course.
667 ieee80211_free_txskb(&local
->hw
, skb
);
671 * Now also check the normal PS-buffered queue, this will
672 * only find something if the filtered queue was emptied
673 * since the filtered frames are all before the normal PS
677 spin_lock_irqsave(&sta
->ps_tx_buf
[ac
].lock
, flags
);
678 skb
= skb_peek(&sta
->ps_tx_buf
[ac
]);
679 if (sta_info_buffer_expired(sta
, skb
))
680 skb
= __skb_dequeue(&sta
->ps_tx_buf
[ac
]);
683 spin_unlock_irqrestore(&sta
->ps_tx_buf
[ac
].lock
, flags
);
686 * frames are queued in order, so if this one
687 * hasn't expired yet (or we reached the end of
688 * the queue) we can stop testing
693 local
->total_ps_buffered
--;
694 ps_dbg(sta
->sdata
, "Buffered frame expired (STA %pM)\n",
696 ieee80211_free_txskb(&local
->hw
, skb
);
700 * Finally, recalculate the TIM bit for this station -- it might
701 * now be clear because the station was too slow to retrieve its
704 sta_info_recalc_tim(sta
);
707 * Return whether there are any frames still buffered, this is
708 * used to check whether the cleanup timer still needs to run,
709 * if there are no frames we don't need to rearm the timer.
711 return !(skb_queue_empty(&sta
->ps_tx_buf
[ac
]) &&
712 skb_queue_empty(&sta
->tx_filtered
[ac
]));
715 static bool sta_info_cleanup_expire_buffered(struct ieee80211_local
*local
,
716 struct sta_info
*sta
)
718 bool have_buffered
= false;
721 /* This is only necessary for stations on BSS interfaces */
722 if (!sta
->sdata
->bss
)
725 for (ac
= 0; ac
< IEEE80211_NUM_ACS
; ac
++)
727 sta_info_cleanup_expire_buffered_ac(local
, sta
, ac
);
729 return have_buffered
;
732 int __must_check
__sta_info_destroy(struct sta_info
*sta
)
734 struct ieee80211_local
*local
;
735 struct ieee80211_sub_if_data
*sdata
;
746 lockdep_assert_held(&local
->sta_mtx
);
749 * Before removing the station from the driver and
750 * rate control, it might still start new aggregation
751 * sessions -- block that to make sure the tear-down
752 * will be sufficient.
754 set_sta_flag(sta
, WLAN_STA_BLOCK_BA
);
755 ieee80211_sta_tear_down_BA_sessions(sta
, false);
757 ret
= sta_info_hash_del(local
, sta
);
761 list_del_rcu(&sta
->list
);
763 mutex_lock(&local
->key_mtx
);
764 for (i
= 0; i
< NUM_DEFAULT_KEYS
; i
++)
765 __ieee80211_key_free(key_mtx_dereference(local
, sta
->gtk
[i
]));
767 __ieee80211_key_free(key_mtx_dereference(local
, sta
->ptk
));
768 mutex_unlock(&local
->key_mtx
);
773 local
->sta_generation
++;
775 if (sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
776 RCU_INIT_POINTER(sdata
->u
.vlan
.sta
, NULL
);
778 while (sta
->sta_state
> IEEE80211_STA_NONE
) {
779 ret
= sta_info_move_state(sta
, sta
->sta_state
- 1);
787 ret
= drv_sta_state(local
, sdata
, sta
, IEEE80211_STA_NONE
,
788 IEEE80211_STA_NOTEXIST
);
789 WARN_ON_ONCE(ret
!= 0);
792 sta_dbg(sdata
, "Removed STA %pM\n", sta
->sta
.addr
);
794 cfg80211_del_sta(sdata
->dev
, sta
->sta
.addr
, GFP_KERNEL
);
796 rate_control_remove_sta_debugfs(sta
);
797 ieee80211_sta_debugfs_remove(sta
);
799 call_rcu(&sta
->rcu_head
, free_sta_rcu
);
804 int sta_info_destroy_addr(struct ieee80211_sub_if_data
*sdata
, const u8
*addr
)
806 struct sta_info
*sta
;
809 mutex_lock(&sdata
->local
->sta_mtx
);
810 sta
= sta_info_get(sdata
, addr
);
811 ret
= __sta_info_destroy(sta
);
812 mutex_unlock(&sdata
->local
->sta_mtx
);
817 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data
*sdata
,
820 struct sta_info
*sta
;
823 mutex_lock(&sdata
->local
->sta_mtx
);
824 sta
= sta_info_get_bss(sdata
, addr
);
825 ret
= __sta_info_destroy(sta
);
826 mutex_unlock(&sdata
->local
->sta_mtx
);
831 static void sta_info_cleanup(unsigned long data
)
833 struct ieee80211_local
*local
= (struct ieee80211_local
*) data
;
834 struct sta_info
*sta
;
835 bool timer_needed
= false;
838 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
)
839 if (sta_info_cleanup_expire_buffered(local
, sta
))
843 if (local
->quiescing
)
849 mod_timer(&local
->sta_cleanup
,
850 round_jiffies(jiffies
+ STA_INFO_CLEANUP_INTERVAL
));
853 void sta_info_init(struct ieee80211_local
*local
)
855 spin_lock_init(&local
->tim_lock
);
856 mutex_init(&local
->sta_mtx
);
857 INIT_LIST_HEAD(&local
->sta_list
);
859 setup_timer(&local
->sta_cleanup
, sta_info_cleanup
,
860 (unsigned long)local
);
863 void sta_info_stop(struct ieee80211_local
*local
)
865 del_timer(&local
->sta_cleanup
);
866 sta_info_flush(local
, NULL
);
870 * sta_info_flush - flush matching STA entries from the STA table
872 * Returns the number of removed STA entries.
874 * @local: local interface data
875 * @sdata: matching rule for the net device (sta->dev) or %NULL to match all STAs
877 int sta_info_flush(struct ieee80211_local
*local
,
878 struct ieee80211_sub_if_data
*sdata
)
880 struct sta_info
*sta
, *tmp
;
885 mutex_lock(&local
->sta_mtx
);
886 list_for_each_entry_safe(sta
, tmp
, &local
->sta_list
, list
) {
887 if (!sdata
|| sdata
== sta
->sdata
) {
888 WARN_ON(__sta_info_destroy(sta
));
892 mutex_unlock(&local
->sta_mtx
);
897 void ieee80211_sta_expire(struct ieee80211_sub_if_data
*sdata
,
898 unsigned long exp_time
)
900 struct ieee80211_local
*local
= sdata
->local
;
901 struct sta_info
*sta
, *tmp
;
903 mutex_lock(&local
->sta_mtx
);
905 list_for_each_entry_safe(sta
, tmp
, &local
->sta_list
, list
) {
906 if (sdata
!= sta
->sdata
)
909 if (time_after(jiffies
, sta
->last_rx
+ exp_time
)) {
910 sta_dbg(sta
->sdata
, "expiring inactive STA %pM\n",
912 WARN_ON(__sta_info_destroy(sta
));
916 mutex_unlock(&local
->sta_mtx
);
919 struct ieee80211_sta
*ieee80211_find_sta_by_ifaddr(struct ieee80211_hw
*hw
,
923 struct sta_info
*sta
, *nxt
;
926 * Just return a random station if localaddr is NULL
929 for_each_sta_info(hw_to_local(hw
), addr
, sta
, nxt
) {
931 !ether_addr_equal(sta
->sdata
->vif
.addr
, localaddr
))
940 EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr
);
942 struct ieee80211_sta
*ieee80211_find_sta(struct ieee80211_vif
*vif
,
945 struct sta_info
*sta
;
950 sta
= sta_info_get_bss(vif_to_sdata(vif
), addr
);
959 EXPORT_SYMBOL(ieee80211_find_sta
);
961 static void clear_sta_ps_flags(void *_sta
)
963 struct sta_info
*sta
= _sta
;
964 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
967 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
||
968 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
969 ps
= &sdata
->bss
->ps
;
973 clear_sta_flag(sta
, WLAN_STA_PS_DRIVER
);
974 if (test_and_clear_sta_flag(sta
, WLAN_STA_PS_STA
))
975 atomic_dec(&ps
->num_sta_ps
);
978 /* powersave support code */
979 void ieee80211_sta_ps_deliver_wakeup(struct sta_info
*sta
)
981 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
982 struct ieee80211_local
*local
= sdata
->local
;
983 struct sk_buff_head pending
;
984 int filtered
= 0, buffered
= 0, ac
;
987 clear_sta_flag(sta
, WLAN_STA_SP
);
989 BUILD_BUG_ON(BITS_TO_LONGS(IEEE80211_NUM_TIDS
) > 1);
990 sta
->driver_buffered_tids
= 0;
992 if (!(local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
))
993 drv_sta_notify(local
, sdata
, STA_NOTIFY_AWAKE
, &sta
->sta
);
995 skb_queue_head_init(&pending
);
997 /* Send all buffered frames to the station */
998 for (ac
= 0; ac
< IEEE80211_NUM_ACS
; ac
++) {
999 int count
= skb_queue_len(&pending
), tmp
;
1001 spin_lock_irqsave(&sta
->tx_filtered
[ac
].lock
, flags
);
1002 skb_queue_splice_tail_init(&sta
->tx_filtered
[ac
], &pending
);
1003 spin_unlock_irqrestore(&sta
->tx_filtered
[ac
].lock
, flags
);
1004 tmp
= skb_queue_len(&pending
);
1005 filtered
+= tmp
- count
;
1008 spin_lock_irqsave(&sta
->ps_tx_buf
[ac
].lock
, flags
);
1009 skb_queue_splice_tail_init(&sta
->ps_tx_buf
[ac
], &pending
);
1010 spin_unlock_irqrestore(&sta
->ps_tx_buf
[ac
].lock
, flags
);
1011 tmp
= skb_queue_len(&pending
);
1012 buffered
+= tmp
- count
;
1015 ieee80211_add_pending_skbs_fn(local
, &pending
, clear_sta_ps_flags
, sta
);
1017 local
->total_ps_buffered
-= buffered
;
1019 sta_info_recalc_tim(sta
);
1022 "STA %pM aid %d sending %d filtered/%d PS frames since STA not sleeping anymore\n",
1023 sta
->sta
.addr
, sta
->sta
.aid
, filtered
, buffered
);
1026 static void ieee80211_send_null_response(struct ieee80211_sub_if_data
*sdata
,
1027 struct sta_info
*sta
, int tid
,
1028 enum ieee80211_frame_release_type reason
)
1030 struct ieee80211_local
*local
= sdata
->local
;
1031 struct ieee80211_qos_hdr
*nullfunc
;
1032 struct sk_buff
*skb
;
1033 int size
= sizeof(*nullfunc
);
1035 bool qos
= test_sta_flag(sta
, WLAN_STA_WME
);
1036 struct ieee80211_tx_info
*info
;
1037 struct ieee80211_chanctx_conf
*chanctx_conf
;
1040 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
|
1041 IEEE80211_STYPE_QOS_NULLFUNC
|
1042 IEEE80211_FCTL_FROMDS
);
1045 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
|
1046 IEEE80211_STYPE_NULLFUNC
|
1047 IEEE80211_FCTL_FROMDS
);
1050 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ size
);
1054 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
1056 nullfunc
= (void *) skb_put(skb
, size
);
1057 nullfunc
->frame_control
= fc
;
1058 nullfunc
->duration_id
= 0;
1059 memcpy(nullfunc
->addr1
, sta
->sta
.addr
, ETH_ALEN
);
1060 memcpy(nullfunc
->addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1061 memcpy(nullfunc
->addr3
, sdata
->vif
.addr
, ETH_ALEN
);
1063 skb
->priority
= tid
;
1064 skb_set_queue_mapping(skb
, ieee802_1d_to_ac
[tid
]);
1066 nullfunc
->qos_ctrl
= cpu_to_le16(tid
);
1068 if (reason
== IEEE80211_FRAME_RELEASE_UAPSD
)
1069 nullfunc
->qos_ctrl
|=
1070 cpu_to_le16(IEEE80211_QOS_CTL_EOSP
);
1073 info
= IEEE80211_SKB_CB(skb
);
1076 * Tell TX path to send this frame even though the
1077 * STA may still remain is PS mode after this frame
1078 * exchange. Also set EOSP to indicate this packet
1079 * ends the poll/service period.
1081 info
->flags
|= IEEE80211_TX_CTL_NO_PS_BUFFER
|
1082 IEEE80211_TX_STATUS_EOSP
|
1083 IEEE80211_TX_CTL_REQ_TX_STATUS
;
1085 drv_allow_buffered_frames(local
, sta
, BIT(tid
), 1, reason
, false);
1088 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
1089 if (WARN_ON(!chanctx_conf
)) {
1095 ieee80211_xmit(sdata
, skb
, chanctx_conf
->def
.chan
->band
);
1100 ieee80211_sta_ps_deliver_response(struct sta_info
*sta
,
1101 int n_frames
, u8 ignored_acs
,
1102 enum ieee80211_frame_release_type reason
)
1104 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
1105 struct ieee80211_local
*local
= sdata
->local
;
1107 bool more_data
= false;
1109 unsigned long driver_release_tids
= 0;
1110 struct sk_buff_head frames
;
1112 /* Service or PS-Poll period starts */
1113 set_sta_flag(sta
, WLAN_STA_SP
);
1115 __skb_queue_head_init(&frames
);
1118 * Get response frame(s) and more data bit for it.
1120 for (ac
= 0; ac
< IEEE80211_NUM_ACS
; ac
++) {
1123 if (ignored_acs
& BIT(ac
))
1126 tids
= ieee80211_tids_for_ac(ac
);
1129 driver_release_tids
= sta
->driver_buffered_tids
& tids
;
1130 if (driver_release_tids
) {
1133 struct sk_buff
*skb
;
1135 while (n_frames
> 0) {
1136 skb
= skb_dequeue(&sta
->tx_filtered
[ac
]);
1139 &sta
->ps_tx_buf
[ac
]);
1141 local
->total_ps_buffered
--;
1147 __skb_queue_tail(&frames
, skb
);
1152 * If the driver has data on more than one TID then
1153 * certainly there's more data if we release just a
1154 * single frame now (from a single TID).
1156 if (reason
== IEEE80211_FRAME_RELEASE_PSPOLL
&&
1157 hweight16(driver_release_tids
) > 1) {
1159 driver_release_tids
=
1160 BIT(ffs(driver_release_tids
) - 1);
1165 if (!skb_queue_empty(&sta
->tx_filtered
[ac
]) ||
1166 !skb_queue_empty(&sta
->ps_tx_buf
[ac
])) {
1176 * For PS-Poll, this can only happen due to a race condition
1177 * when we set the TIM bit and the station notices it, but
1178 * before it can poll for the frame we expire it.
1180 * For uAPSD, this is said in the standard (11.2.1.5 h):
1181 * At each unscheduled SP for a non-AP STA, the AP shall
1182 * attempt to transmit at least one MSDU or MMPDU, but no
1183 * more than the value specified in the Max SP Length field
1184 * in the QoS Capability element from delivery-enabled ACs,
1185 * that are destined for the non-AP STA.
1187 * Since we have no other MSDU/MMPDU, transmit a QoS null frame.
1190 /* This will evaluate to 1, 3, 5 or 7. */
1191 tid
= 7 - ((ffs(~ignored_acs
) - 1) << 1);
1193 ieee80211_send_null_response(sdata
, sta
, tid
, reason
);
1197 if (!driver_release_tids
) {
1198 struct sk_buff_head pending
;
1199 struct sk_buff
*skb
;
1203 skb_queue_head_init(&pending
);
1205 while ((skb
= __skb_dequeue(&frames
))) {
1206 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1207 struct ieee80211_hdr
*hdr
= (void *) skb
->data
;
1213 * Tell TX path to send this frame even though the
1214 * STA may still remain is PS mode after this frame
1217 info
->flags
|= IEEE80211_TX_CTL_NO_PS_BUFFER
;
1220 * Use MoreData flag to indicate whether there are
1221 * more buffered frames for this STA
1223 if (more_data
|| !skb_queue_empty(&frames
))
1224 hdr
->frame_control
|=
1225 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
1227 hdr
->frame_control
&=
1228 cpu_to_le16(~IEEE80211_FCTL_MOREDATA
);
1230 if (ieee80211_is_data_qos(hdr
->frame_control
) ||
1231 ieee80211_is_qos_nullfunc(hdr
->frame_control
))
1232 qoshdr
= ieee80211_get_qos_ctl(hdr
);
1234 /* end service period after last frame */
1235 if (skb_queue_empty(&frames
)) {
1236 if (reason
== IEEE80211_FRAME_RELEASE_UAPSD
&&
1238 *qoshdr
|= IEEE80211_QOS_CTL_EOSP
;
1240 info
->flags
|= IEEE80211_TX_STATUS_EOSP
|
1241 IEEE80211_TX_CTL_REQ_TX_STATUS
;
1245 tids
|= BIT(*qoshdr
& IEEE80211_QOS_CTL_TID_MASK
);
1249 __skb_queue_tail(&pending
, skb
);
1252 drv_allow_buffered_frames(local
, sta
, tids
, num
,
1255 ieee80211_add_pending_skbs(local
, &pending
);
1257 sta_info_recalc_tim(sta
);
1260 * We need to release a frame that is buffered somewhere in the
1261 * driver ... it'll have to handle that.
1262 * Note that, as per the comment above, it'll also have to see
1263 * if there is more than just one frame on the specific TID that
1264 * we're releasing from, and it needs to set the more-data bit
1265 * accordingly if we tell it that there's no more data. If we do
1266 * tell it there's more data, then of course the more-data bit
1267 * needs to be set anyway.
1269 drv_release_buffered_frames(local
, sta
, driver_release_tids
,
1270 n_frames
, reason
, more_data
);
1273 * Note that we don't recalculate the TIM bit here as it would
1274 * most likely have no effect at all unless the driver told us
1275 * that the TID became empty before returning here from the
1277 * Either way, however, when the driver tells us that the TID
1278 * became empty we'll do the TIM recalculation.
1283 void ieee80211_sta_ps_deliver_poll_response(struct sta_info
*sta
)
1285 u8 ignore_for_response
= sta
->sta
.uapsd_queues
;
1288 * If all ACs are delivery-enabled then we should reply
1289 * from any of them, if only some are enabled we reply
1290 * only from the non-enabled ones.
1292 if (ignore_for_response
== BIT(IEEE80211_NUM_ACS
) - 1)
1293 ignore_for_response
= 0;
1295 ieee80211_sta_ps_deliver_response(sta
, 1, ignore_for_response
,
1296 IEEE80211_FRAME_RELEASE_PSPOLL
);
1299 void ieee80211_sta_ps_deliver_uapsd(struct sta_info
*sta
)
1301 int n_frames
= sta
->sta
.max_sp
;
1302 u8 delivery_enabled
= sta
->sta
.uapsd_queues
;
1305 * If we ever grow support for TSPEC this might happen if
1306 * the TSPEC update from hostapd comes in between a trigger
1307 * frame setting WLAN_STA_UAPSD in the RX path and this
1308 * actually getting called.
1310 if (!delivery_enabled
)
1313 switch (sta
->sta
.max_sp
) {
1324 /* XXX: what is a good value? */
1329 ieee80211_sta_ps_deliver_response(sta
, n_frames
, ~delivery_enabled
,
1330 IEEE80211_FRAME_RELEASE_UAPSD
);
1333 void ieee80211_sta_block_awake(struct ieee80211_hw
*hw
,
1334 struct ieee80211_sta
*pubsta
, bool block
)
1336 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
1338 trace_api_sta_block_awake(sta
->local
, pubsta
, block
);
1341 set_sta_flag(sta
, WLAN_STA_PS_DRIVER
);
1342 else if (test_sta_flag(sta
, WLAN_STA_PS_DRIVER
))
1343 ieee80211_queue_work(hw
, &sta
->drv_unblock_wk
);
1345 EXPORT_SYMBOL(ieee80211_sta_block_awake
);
1347 void ieee80211_sta_eosp_irqsafe(struct ieee80211_sta
*pubsta
)
1349 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
1350 struct ieee80211_local
*local
= sta
->local
;
1351 struct sk_buff
*skb
;
1352 struct skb_eosp_msg_data
*data
;
1354 trace_api_eosp(local
, pubsta
);
1356 skb
= alloc_skb(0, GFP_ATOMIC
);
1358 /* too bad ... but race is better than loss */
1359 clear_sta_flag(sta
, WLAN_STA_SP
);
1363 data
= (void *)skb
->cb
;
1364 memcpy(data
->sta
, pubsta
->addr
, ETH_ALEN
);
1365 memcpy(data
->iface
, sta
->sdata
->vif
.addr
, ETH_ALEN
);
1366 skb
->pkt_type
= IEEE80211_EOSP_MSG
;
1367 skb_queue_tail(&local
->skb_queue
, skb
);
1368 tasklet_schedule(&local
->tasklet
);
1370 EXPORT_SYMBOL(ieee80211_sta_eosp_irqsafe
);
1372 void ieee80211_sta_set_buffered(struct ieee80211_sta
*pubsta
,
1373 u8 tid
, bool buffered
)
1375 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
1377 if (WARN_ON(tid
>= IEEE80211_NUM_TIDS
))
1381 set_bit(tid
, &sta
->driver_buffered_tids
);
1383 clear_bit(tid
, &sta
->driver_buffered_tids
);
1385 sta_info_recalc_tim(sta
);
1387 EXPORT_SYMBOL(ieee80211_sta_set_buffered
);
1389 int sta_info_move_state(struct sta_info
*sta
,
1390 enum ieee80211_sta_state new_state
)
1394 if (sta
->sta_state
== new_state
)
1397 /* check allowed transitions first */
1399 switch (new_state
) {
1400 case IEEE80211_STA_NONE
:
1401 if (sta
->sta_state
!= IEEE80211_STA_AUTH
)
1404 case IEEE80211_STA_AUTH
:
1405 if (sta
->sta_state
!= IEEE80211_STA_NONE
&&
1406 sta
->sta_state
!= IEEE80211_STA_ASSOC
)
1409 case IEEE80211_STA_ASSOC
:
1410 if (sta
->sta_state
!= IEEE80211_STA_AUTH
&&
1411 sta
->sta_state
!= IEEE80211_STA_AUTHORIZED
)
1414 case IEEE80211_STA_AUTHORIZED
:
1415 if (sta
->sta_state
!= IEEE80211_STA_ASSOC
)
1419 WARN(1, "invalid state %d", new_state
);
1423 sta_dbg(sta
->sdata
, "moving STA %pM to state %d\n",
1424 sta
->sta
.addr
, new_state
);
1427 * notify the driver before the actual changes so it can
1428 * fail the transition
1430 if (test_sta_flag(sta
, WLAN_STA_INSERTED
)) {
1431 int err
= drv_sta_state(sta
->local
, sta
->sdata
, sta
,
1432 sta
->sta_state
, new_state
);
1437 /* reflect the change in all state variables */
1439 switch (new_state
) {
1440 case IEEE80211_STA_NONE
:
1441 if (sta
->sta_state
== IEEE80211_STA_AUTH
)
1442 clear_bit(WLAN_STA_AUTH
, &sta
->_flags
);
1444 case IEEE80211_STA_AUTH
:
1445 if (sta
->sta_state
== IEEE80211_STA_NONE
)
1446 set_bit(WLAN_STA_AUTH
, &sta
->_flags
);
1447 else if (sta
->sta_state
== IEEE80211_STA_ASSOC
)
1448 clear_bit(WLAN_STA_ASSOC
, &sta
->_flags
);
1450 case IEEE80211_STA_ASSOC
:
1451 if (sta
->sta_state
== IEEE80211_STA_AUTH
) {
1452 set_bit(WLAN_STA_ASSOC
, &sta
->_flags
);
1453 } else if (sta
->sta_state
== IEEE80211_STA_AUTHORIZED
) {
1454 if (sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1455 (sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1456 !sta
->sdata
->u
.vlan
.sta
))
1457 atomic_dec(&sta
->sdata
->bss
->num_mcast_sta
);
1458 clear_bit(WLAN_STA_AUTHORIZED
, &sta
->_flags
);
1461 case IEEE80211_STA_AUTHORIZED
:
1462 if (sta
->sta_state
== IEEE80211_STA_ASSOC
) {
1463 if (sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1464 (sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1465 !sta
->sdata
->u
.vlan
.sta
))
1466 atomic_inc(&sta
->sdata
->bss
->num_mcast_sta
);
1467 set_bit(WLAN_STA_AUTHORIZED
, &sta
->_flags
);
1474 sta
->sta_state
= new_state
;