2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
10 #include <linux/module.h>
11 #include <linux/init.h>
12 #include <linux/etherdevice.h>
13 #include <linux/netdevice.h>
14 #include <linux/types.h>
15 #include <linux/slab.h>
16 #include <linux/skbuff.h>
17 #include <linux/if_arp.h>
18 #include <linux/timer.h>
19 #include <linux/rtnetlink.h>
21 #include <net/mac80211.h>
22 #include "ieee80211_i.h"
23 #include "driver-ops.h"
26 #include "debugfs_sta.h"
31 * DOC: STA information lifetime rules
33 * STA info structures (&struct sta_info) are managed in a hash table
34 * for faster lookup and a list for iteration. They are managed using
35 * RCU, i.e. access to the list and hash table is protected by RCU.
37 * Upon allocating a STA info structure with sta_info_alloc(), the caller
38 * owns that structure. It must then insert it into the hash table using
39 * either sta_info_insert() or sta_info_insert_rcu(); only in the latter
40 * case (which acquires an rcu read section but must not be called from
41 * within one) will the pointer still be valid after the call. Note that
42 * the caller may not do much with the STA info before inserting it, in
43 * particular, it may not start any mesh peer link management or add
46 * When the insertion fails (sta_info_insert()) returns non-zero), the
47 * structure will have been freed by sta_info_insert()!
49 * Station entries are added by mac80211 when you establish a link with a
50 * peer. This means different things for the different type of interfaces
51 * we support. For a regular station this mean we add the AP sta when we
52 * receive an association response from the AP. For IBSS this occurs when
53 * get to know about a peer on the same IBSS. For WDS we add the sta for
54 * the peer immediately upon device open. When using AP mode we add stations
55 * for each respective station upon request from userspace through nl80211.
57 * In order to remove a STA info structure, various sta_info_destroy_*()
58 * calls are available.
60 * There is no concept of ownership on a STA entry, each structure is
61 * owned by the global hash table/list until it is removed. All users of
62 * the structure need to be RCU protected so that the structure won't be
63 * freed before they are done using it.
66 /* Caller must hold local->sta_mtx */
67 static int sta_info_hash_del(struct ieee80211_local
*local
,
72 s
= rcu_dereference_protected(local
->sta_hash
[STA_HASH(sta
->sta
.addr
)],
73 lockdep_is_held(&local
->sta_mtx
));
77 rcu_assign_pointer(local
->sta_hash
[STA_HASH(sta
->sta
.addr
)],
82 while (rcu_access_pointer(s
->hnext
) &&
83 rcu_access_pointer(s
->hnext
) != sta
)
84 s
= rcu_dereference_protected(s
->hnext
,
85 lockdep_is_held(&local
->sta_mtx
));
86 if (rcu_access_pointer(s
->hnext
)) {
87 rcu_assign_pointer(s
->hnext
, sta
->hnext
);
94 static void free_sta_work(struct work_struct
*wk
)
96 struct sta_info
*sta
= container_of(wk
, struct sta_info
, free_sta_wk
);
98 struct tid_ampdu_tx
*tid_tx
;
99 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
100 struct ieee80211_local
*local
= sdata
->local
;
103 * At this point, when being called as call_rcu callback,
104 * neither mac80211 nor the driver can reference this
105 * sta struct any more except by still existing timers
106 * associated with this station that we clean up below.
109 if (test_sta_flag(sta
, WLAN_STA_PS_STA
)) {
112 clear_sta_flag(sta
, WLAN_STA_PS_STA
);
114 atomic_dec(&sdata
->bss
->num_sta_ps
);
115 sta_info_recalc_tim(sta
);
118 for (ac
= 0; ac
< IEEE80211_NUM_ACS
; ac
++) {
119 local
->total_ps_buffered
-= skb_queue_len(&sta
->ps_tx_buf
[ac
]);
120 __skb_queue_purge(&sta
->ps_tx_buf
[ac
]);
121 __skb_queue_purge(&sta
->tx_filtered
[ac
]);
124 #ifdef CONFIG_MAC80211_MESH
125 if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
126 mesh_accept_plinks_update(sdata
);
127 mesh_plink_deactivate(sta
);
128 del_timer_sync(&sta
->plink_timer
);
132 cancel_work_sync(&sta
->drv_unblock_wk
);
135 * Destroy aggregation state here. It would be nice to wait for the
136 * driver to finish aggregation stop and then clean up, but for now
137 * drivers have to handle aggregation stop being requested, followed
138 * directly by station destruction.
140 for (i
= 0; i
< STA_TID_NUM
; i
++) {
141 tid_tx
= rcu_dereference_raw(sta
->ampdu_mlme
.tid_tx
[i
]);
144 __skb_queue_purge(&tid_tx
->pending
);
148 sta_info_free(local
, sta
);
151 static void free_sta_rcu(struct rcu_head
*h
)
153 struct sta_info
*sta
= container_of(h
, struct sta_info
, rcu_head
);
155 ieee80211_queue_work(&sta
->local
->hw
, &sta
->free_sta_wk
);
158 /* protected by RCU */
159 struct sta_info
*sta_info_get(struct ieee80211_sub_if_data
*sdata
,
162 struct ieee80211_local
*local
= sdata
->local
;
163 struct sta_info
*sta
;
165 sta
= rcu_dereference_check(local
->sta_hash
[STA_HASH(addr
)],
166 lockdep_is_held(&local
->sta_mtx
));
168 if (sta
->sdata
== sdata
&&
169 ether_addr_equal(sta
->sta
.addr
, addr
))
171 sta
= rcu_dereference_check(sta
->hnext
,
172 lockdep_is_held(&local
->sta_mtx
));
178 * Get sta info either from the specified interface
179 * or from one of its vlans
181 struct sta_info
*sta_info_get_bss(struct ieee80211_sub_if_data
*sdata
,
184 struct ieee80211_local
*local
= sdata
->local
;
185 struct sta_info
*sta
;
187 sta
= rcu_dereference_check(local
->sta_hash
[STA_HASH(addr
)],
188 lockdep_is_held(&local
->sta_mtx
));
190 if ((sta
->sdata
== sdata
||
191 (sta
->sdata
->bss
&& sta
->sdata
->bss
== sdata
->bss
)) &&
192 ether_addr_equal(sta
->sta
.addr
, addr
))
194 sta
= rcu_dereference_check(sta
->hnext
,
195 lockdep_is_held(&local
->sta_mtx
));
200 struct sta_info
*sta_info_get_by_idx(struct ieee80211_sub_if_data
*sdata
,
203 struct ieee80211_local
*local
= sdata
->local
;
204 struct sta_info
*sta
;
207 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
) {
208 if (sdata
!= sta
->sdata
)
221 * sta_info_free - free STA
223 * @local: pointer to the global information
224 * @sta: STA info to free
226 * This function must undo everything done by sta_info_alloc()
227 * that may happen before sta_info_insert(). It may only be
228 * called when sta_info_insert() has not been attempted (and
229 * if that fails, the station is freed anyway.)
231 void sta_info_free(struct ieee80211_local
*local
, struct sta_info
*sta
)
234 rate_control_free_sta(sta
);
236 sta_dbg(sta
->sdata
, "Destroyed STA %pM\n", sta
->sta
.addr
);
241 /* Caller must hold local->sta_mtx */
242 static void sta_info_hash_add(struct ieee80211_local
*local
,
243 struct sta_info
*sta
)
245 lockdep_assert_held(&local
->sta_mtx
);
246 sta
->hnext
= local
->sta_hash
[STA_HASH(sta
->sta
.addr
)];
247 rcu_assign_pointer(local
->sta_hash
[STA_HASH(sta
->sta
.addr
)], sta
);
250 static void sta_unblock(struct work_struct
*wk
)
252 struct sta_info
*sta
;
254 sta
= container_of(wk
, struct sta_info
, drv_unblock_wk
);
259 if (!test_sta_flag(sta
, WLAN_STA_PS_STA
)) {
261 ieee80211_sta_ps_deliver_wakeup(sta
);
263 } else if (test_and_clear_sta_flag(sta
, WLAN_STA_PSPOLL
)) {
264 clear_sta_flag(sta
, WLAN_STA_PS_DRIVER
);
267 ieee80211_sta_ps_deliver_poll_response(sta
);
269 } else if (test_and_clear_sta_flag(sta
, WLAN_STA_UAPSD
)) {
270 clear_sta_flag(sta
, WLAN_STA_PS_DRIVER
);
273 ieee80211_sta_ps_deliver_uapsd(sta
);
276 clear_sta_flag(sta
, WLAN_STA_PS_DRIVER
);
279 static int sta_prepare_rate_control(struct ieee80211_local
*local
,
280 struct sta_info
*sta
, gfp_t gfp
)
282 if (local
->hw
.flags
& IEEE80211_HW_HAS_RATE_CONTROL
)
285 sta
->rate_ctrl
= local
->rate_ctrl
;
286 sta
->rate_ctrl_priv
= rate_control_alloc_sta(sta
->rate_ctrl
,
288 if (!sta
->rate_ctrl_priv
)
294 struct sta_info
*sta_info_alloc(struct ieee80211_sub_if_data
*sdata
,
295 const u8
*addr
, gfp_t gfp
)
297 struct ieee80211_local
*local
= sdata
->local
;
298 struct sta_info
*sta
;
299 struct timespec uptime
;
302 sta
= kzalloc(sizeof(*sta
) + local
->hw
.sta_data_size
, gfp
);
306 spin_lock_init(&sta
->lock
);
307 INIT_WORK(&sta
->drv_unblock_wk
, sta_unblock
);
308 INIT_WORK(&sta
->free_sta_wk
, free_sta_work
);
309 INIT_WORK(&sta
->ampdu_mlme
.work
, ieee80211_ba_session_work
);
310 mutex_init(&sta
->ampdu_mlme
.mtx
);
312 memcpy(sta
->sta
.addr
, addr
, ETH_ALEN
);
315 sta
->last_rx
= jiffies
;
317 sta
->sta_state
= IEEE80211_STA_NONE
;
319 do_posix_clock_monotonic_gettime(&uptime
);
320 sta
->last_connected
= uptime
.tv_sec
;
321 ewma_init(&sta
->avg_signal
, 1024, 8);
323 if (sta_prepare_rate_control(local
, sta
, gfp
)) {
328 for (i
= 0; i
< STA_TID_NUM
; i
++) {
330 * timer_to_tid must be initialized with identity mapping
331 * to enable session_timer's data differentiation. See
332 * sta_rx_agg_session_timer_expired for usage.
334 sta
->timer_to_tid
[i
] = i
;
336 for (i
= 0; i
< IEEE80211_NUM_ACS
; i
++) {
337 skb_queue_head_init(&sta
->ps_tx_buf
[i
]);
338 skb_queue_head_init(&sta
->tx_filtered
[i
]);
341 for (i
= 0; i
< NUM_RX_DATA_QUEUES
; i
++)
342 sta
->last_seq_ctrl
[i
] = cpu_to_le16(USHRT_MAX
);
344 sta_dbg(sdata
, "Allocated STA %pM\n", sta
->sta
.addr
);
346 #ifdef CONFIG_MAC80211_MESH
347 sta
->plink_state
= NL80211_PLINK_LISTEN
;
348 init_timer(&sta
->plink_timer
);
354 static int sta_info_insert_check(struct sta_info
*sta
)
356 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
359 * Can't be a WARN_ON because it can be triggered through a race:
360 * something inserts a STA (on one CPU) without holding the RTNL
361 * and another CPU turns off the net device.
363 if (unlikely(!ieee80211_sdata_running(sdata
)))
366 if (WARN_ON(ether_addr_equal(sta
->sta
.addr
, sdata
->vif
.addr
) ||
367 is_multicast_ether_addr(sta
->sta
.addr
)))
373 static int sta_info_insert_drv_state(struct ieee80211_local
*local
,
374 struct ieee80211_sub_if_data
*sdata
,
375 struct sta_info
*sta
)
377 enum ieee80211_sta_state state
;
380 for (state
= IEEE80211_STA_NOTEXIST
; state
< sta
->sta_state
; state
++) {
381 err
= drv_sta_state(local
, sdata
, sta
, state
, state
+ 1);
388 * Drivers using legacy sta_add/sta_remove callbacks only
389 * get uploaded set to true after sta_add is called.
391 if (!local
->ops
->sta_add
)
392 sta
->uploaded
= true;
396 if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
398 "failed to move IBSS STA %pM to state %d (%d) - keeping it anyway\n",
399 sta
->sta
.addr
, state
+ 1, err
);
403 /* unwind on error */
404 for (; state
> IEEE80211_STA_NOTEXIST
; state
--)
405 WARN_ON(drv_sta_state(local
, sdata
, sta
, state
, state
- 1));
411 * should be called with sta_mtx locked
412 * this function replaces the mutex lock
415 static int sta_info_insert_finish(struct sta_info
*sta
) __acquires(RCU
)
417 struct ieee80211_local
*local
= sta
->local
;
418 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
419 struct station_info sinfo
;
422 lockdep_assert_held(&local
->sta_mtx
);
424 /* check if STA exists already */
425 if (sta_info_get_bss(sdata
, sta
->sta
.addr
)) {
431 err
= sta_info_insert_drv_state(local
, sdata
, sta
);
436 local
->sta_generation
++;
439 /* make the station visible */
440 sta_info_hash_add(local
, sta
);
442 list_add_rcu(&sta
->list
, &local
->sta_list
);
444 set_sta_flag(sta
, WLAN_STA_INSERTED
);
446 ieee80211_sta_debugfs_add(sta
);
447 rate_control_add_sta_debugfs(sta
);
449 memset(&sinfo
, 0, sizeof(sinfo
));
451 sinfo
.generation
= local
->sta_generation
;
452 cfg80211_new_sta(sdata
->dev
, sta
->sta
.addr
, &sinfo
, GFP_KERNEL
);
454 sta_dbg(sdata
, "Inserted STA %pM\n", sta
->sta
.addr
);
456 /* move reference to rcu-protected */
458 mutex_unlock(&local
->sta_mtx
);
460 if (ieee80211_vif_is_mesh(&sdata
->vif
))
461 mesh_accept_plinks_update(sdata
);
465 mutex_unlock(&local
->sta_mtx
);
470 int sta_info_insert_rcu(struct sta_info
*sta
) __acquires(RCU
)
472 struct ieee80211_local
*local
= sta
->local
;
477 err
= sta_info_insert_check(sta
);
483 mutex_lock(&local
->sta_mtx
);
485 err
= sta_info_insert_finish(sta
);
492 sta_info_free(local
, sta
);
496 int sta_info_insert(struct sta_info
*sta
)
498 int err
= sta_info_insert_rcu(sta
);
505 static inline void __bss_tim_set(struct ieee80211_if_ap
*bss
, u16 aid
)
508 * This format has been mandated by the IEEE specifications,
509 * so this line may not be changed to use the __set_bit() format.
511 bss
->tim
[aid
/ 8] |= (1 << (aid
% 8));
514 static inline void __bss_tim_clear(struct ieee80211_if_ap
*bss
, u16 aid
)
517 * This format has been mandated by the IEEE specifications,
518 * so this line may not be changed to use the __clear_bit() format.
520 bss
->tim
[aid
/ 8] &= ~(1 << (aid
% 8));
523 static unsigned long ieee80211_tids_for_ac(int ac
)
525 /* If we ever support TIDs > 7, this obviously needs to be adjusted */
527 case IEEE80211_AC_VO
:
528 return BIT(6) | BIT(7);
529 case IEEE80211_AC_VI
:
530 return BIT(4) | BIT(5);
531 case IEEE80211_AC_BE
:
532 return BIT(0) | BIT(3);
533 case IEEE80211_AC_BK
:
534 return BIT(1) | BIT(2);
541 void sta_info_recalc_tim(struct sta_info
*sta
)
543 struct ieee80211_local
*local
= sta
->local
;
544 struct ieee80211_if_ap
*bss
= sta
->sdata
->bss
;
546 bool indicate_tim
= false;
547 u8 ignore_for_tim
= sta
->sta
.uapsd_queues
;
550 if (WARN_ON_ONCE(!sta
->sdata
->bss
))
553 /* No need to do anything if the driver does all */
554 if (local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
)
561 * If all ACs are delivery-enabled then we should build
562 * the TIM bit for all ACs anyway; if only some are then
563 * we ignore those and build the TIM bit using only the
566 if (ignore_for_tim
== BIT(IEEE80211_NUM_ACS
) - 1)
569 for (ac
= 0; ac
< IEEE80211_NUM_ACS
; ac
++) {
572 if (ignore_for_tim
& BIT(ac
))
575 indicate_tim
|= !skb_queue_empty(&sta
->tx_filtered
[ac
]) ||
576 !skb_queue_empty(&sta
->ps_tx_buf
[ac
]);
580 tids
= ieee80211_tids_for_ac(ac
);
583 sta
->driver_buffered_tids
& tids
;
587 spin_lock_irqsave(&local
->tim_lock
, flags
);
590 __bss_tim_set(bss
, sta
->sta
.aid
);
592 __bss_tim_clear(bss
, sta
->sta
.aid
);
594 if (local
->ops
->set_tim
) {
595 local
->tim_in_locked_section
= true;
596 drv_set_tim(local
, &sta
->sta
, indicate_tim
);
597 local
->tim_in_locked_section
= false;
600 spin_unlock_irqrestore(&local
->tim_lock
, flags
);
603 static bool sta_info_buffer_expired(struct sta_info
*sta
, struct sk_buff
*skb
)
605 struct ieee80211_tx_info
*info
;
611 info
= IEEE80211_SKB_CB(skb
);
613 /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
614 timeout
= (sta
->listen_interval
*
615 sta
->sdata
->vif
.bss_conf
.beacon_int
*
617 if (timeout
< STA_TX_BUFFER_EXPIRE
)
618 timeout
= STA_TX_BUFFER_EXPIRE
;
619 return time_after(jiffies
, info
->control
.jiffies
+ timeout
);
623 static bool sta_info_cleanup_expire_buffered_ac(struct ieee80211_local
*local
,
624 struct sta_info
*sta
, int ac
)
630 * First check for frames that should expire on the filtered
631 * queue. Frames here were rejected by the driver and are on
632 * a separate queue to avoid reordering with normal PS-buffered
633 * frames. They also aren't accounted for right now in the
634 * total_ps_buffered counter.
637 spin_lock_irqsave(&sta
->tx_filtered
[ac
].lock
, flags
);
638 skb
= skb_peek(&sta
->tx_filtered
[ac
]);
639 if (sta_info_buffer_expired(sta
, skb
))
640 skb
= __skb_dequeue(&sta
->tx_filtered
[ac
]);
643 spin_unlock_irqrestore(&sta
->tx_filtered
[ac
].lock
, flags
);
646 * Frames are queued in order, so if this one
647 * hasn't expired yet we can stop testing. If
648 * we actually reached the end of the queue we
649 * also need to stop, of course.
657 * Now also check the normal PS-buffered queue, this will
658 * only find something if the filtered queue was emptied
659 * since the filtered frames are all before the normal PS
663 spin_lock_irqsave(&sta
->ps_tx_buf
[ac
].lock
, flags
);
664 skb
= skb_peek(&sta
->ps_tx_buf
[ac
]);
665 if (sta_info_buffer_expired(sta
, skb
))
666 skb
= __skb_dequeue(&sta
->ps_tx_buf
[ac
]);
669 spin_unlock_irqrestore(&sta
->ps_tx_buf
[ac
].lock
, flags
);
672 * frames are queued in order, so if this one
673 * hasn't expired yet (or we reached the end of
674 * the queue) we can stop testing
679 local
->total_ps_buffered
--;
680 ps_dbg(sta
->sdata
, "Buffered frame expired (STA %pM)\n",
686 * Finally, recalculate the TIM bit for this station -- it might
687 * now be clear because the station was too slow to retrieve its
690 sta_info_recalc_tim(sta
);
693 * Return whether there are any frames still buffered, this is
694 * used to check whether the cleanup timer still needs to run,
695 * if there are no frames we don't need to rearm the timer.
697 return !(skb_queue_empty(&sta
->ps_tx_buf
[ac
]) &&
698 skb_queue_empty(&sta
->tx_filtered
[ac
]));
701 static bool sta_info_cleanup_expire_buffered(struct ieee80211_local
*local
,
702 struct sta_info
*sta
)
704 bool have_buffered
= false;
707 /* This is only necessary for stations on BSS interfaces */
708 if (!sta
->sdata
->bss
)
711 for (ac
= 0; ac
< IEEE80211_NUM_ACS
; ac
++)
713 sta_info_cleanup_expire_buffered_ac(local
, sta
, ac
);
715 return have_buffered
;
718 int __must_check
__sta_info_destroy(struct sta_info
*sta
)
720 struct ieee80211_local
*local
;
721 struct ieee80211_sub_if_data
*sdata
;
732 lockdep_assert_held(&local
->sta_mtx
);
735 * Before removing the station from the driver and
736 * rate control, it might still start new aggregation
737 * sessions -- block that to make sure the tear-down
738 * will be sufficient.
740 set_sta_flag(sta
, WLAN_STA_BLOCK_BA
);
741 ieee80211_sta_tear_down_BA_sessions(sta
, false);
743 ret
= sta_info_hash_del(local
, sta
);
747 list_del_rcu(&sta
->list
);
749 mutex_lock(&local
->key_mtx
);
750 for (i
= 0; i
< NUM_DEFAULT_KEYS
; i
++)
751 __ieee80211_key_free(key_mtx_dereference(local
, sta
->gtk
[i
]));
753 __ieee80211_key_free(key_mtx_dereference(local
, sta
->ptk
));
754 mutex_unlock(&local
->key_mtx
);
759 local
->sta_generation
++;
761 if (sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
762 RCU_INIT_POINTER(sdata
->u
.vlan
.sta
, NULL
);
764 while (sta
->sta_state
> IEEE80211_STA_NONE
) {
765 ret
= sta_info_move_state(sta
, sta
->sta_state
- 1);
773 ret
= drv_sta_state(local
, sdata
, sta
, IEEE80211_STA_NONE
,
774 IEEE80211_STA_NOTEXIST
);
775 WARN_ON_ONCE(ret
!= 0);
778 sta_dbg(sdata
, "Removed STA %pM\n", sta
->sta
.addr
);
780 cfg80211_del_sta(sdata
->dev
, sta
->sta
.addr
, GFP_KERNEL
);
782 rate_control_remove_sta_debugfs(sta
);
783 ieee80211_sta_debugfs_remove(sta
);
785 call_rcu(&sta
->rcu_head
, free_sta_rcu
);
790 int sta_info_destroy_addr(struct ieee80211_sub_if_data
*sdata
, const u8
*addr
)
792 struct sta_info
*sta
;
795 mutex_lock(&sdata
->local
->sta_mtx
);
796 sta
= sta_info_get(sdata
, addr
);
797 ret
= __sta_info_destroy(sta
);
798 mutex_unlock(&sdata
->local
->sta_mtx
);
803 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data
*sdata
,
806 struct sta_info
*sta
;
809 mutex_lock(&sdata
->local
->sta_mtx
);
810 sta
= sta_info_get_bss(sdata
, addr
);
811 ret
= __sta_info_destroy(sta
);
812 mutex_unlock(&sdata
->local
->sta_mtx
);
817 static void sta_info_cleanup(unsigned long data
)
819 struct ieee80211_local
*local
= (struct ieee80211_local
*) data
;
820 struct sta_info
*sta
;
821 bool timer_needed
= false;
824 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
)
825 if (sta_info_cleanup_expire_buffered(local
, sta
))
829 if (local
->quiescing
)
835 mod_timer(&local
->sta_cleanup
,
836 round_jiffies(jiffies
+ STA_INFO_CLEANUP_INTERVAL
));
839 void sta_info_init(struct ieee80211_local
*local
)
841 spin_lock_init(&local
->tim_lock
);
842 mutex_init(&local
->sta_mtx
);
843 INIT_LIST_HEAD(&local
->sta_list
);
845 setup_timer(&local
->sta_cleanup
, sta_info_cleanup
,
846 (unsigned long)local
);
849 void sta_info_stop(struct ieee80211_local
*local
)
851 del_timer(&local
->sta_cleanup
);
852 sta_info_flush(local
, NULL
);
856 * sta_info_flush - flush matching STA entries from the STA table
858 * Returns the number of removed STA entries.
860 * @local: local interface data
861 * @sdata: matching rule for the net device (sta->dev) or %NULL to match all STAs
863 int sta_info_flush(struct ieee80211_local
*local
,
864 struct ieee80211_sub_if_data
*sdata
)
866 struct sta_info
*sta
, *tmp
;
871 mutex_lock(&local
->sta_mtx
);
872 list_for_each_entry_safe(sta
, tmp
, &local
->sta_list
, list
) {
873 if (!sdata
|| sdata
== sta
->sdata
) {
874 WARN_ON(__sta_info_destroy(sta
));
878 mutex_unlock(&local
->sta_mtx
);
883 void ieee80211_sta_expire(struct ieee80211_sub_if_data
*sdata
,
884 unsigned long exp_time
)
886 struct ieee80211_local
*local
= sdata
->local
;
887 struct sta_info
*sta
, *tmp
;
889 mutex_lock(&local
->sta_mtx
);
891 list_for_each_entry_safe(sta
, tmp
, &local
->sta_list
, list
) {
892 if (sdata
!= sta
->sdata
)
895 if (time_after(jiffies
, sta
->last_rx
+ exp_time
)) {
896 ibss_dbg(sdata
, "expiring inactive STA %pM\n",
898 WARN_ON(__sta_info_destroy(sta
));
902 mutex_unlock(&local
->sta_mtx
);
905 struct ieee80211_sta
*ieee80211_find_sta_by_ifaddr(struct ieee80211_hw
*hw
,
909 struct sta_info
*sta
, *nxt
;
912 * Just return a random station if localaddr is NULL
915 for_each_sta_info(hw_to_local(hw
), addr
, sta
, nxt
) {
917 !ether_addr_equal(sta
->sdata
->vif
.addr
, localaddr
))
926 EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr
);
928 struct ieee80211_sta
*ieee80211_find_sta(struct ieee80211_vif
*vif
,
931 struct sta_info
*sta
;
936 sta
= sta_info_get_bss(vif_to_sdata(vif
), addr
);
945 EXPORT_SYMBOL(ieee80211_find_sta
);
947 static void clear_sta_ps_flags(void *_sta
)
949 struct sta_info
*sta
= _sta
;
950 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
952 clear_sta_flag(sta
, WLAN_STA_PS_DRIVER
);
953 if (test_and_clear_sta_flag(sta
, WLAN_STA_PS_STA
))
954 atomic_dec(&sdata
->bss
->num_sta_ps
);
957 /* powersave support code */
958 void ieee80211_sta_ps_deliver_wakeup(struct sta_info
*sta
)
960 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
961 struct ieee80211_local
*local
= sdata
->local
;
962 struct sk_buff_head pending
;
963 int filtered
= 0, buffered
= 0, ac
;
965 clear_sta_flag(sta
, WLAN_STA_SP
);
967 BUILD_BUG_ON(BITS_TO_LONGS(STA_TID_NUM
) > 1);
968 sta
->driver_buffered_tids
= 0;
970 if (!(local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
))
971 drv_sta_notify(local
, sdata
, STA_NOTIFY_AWAKE
, &sta
->sta
);
973 skb_queue_head_init(&pending
);
975 /* Send all buffered frames to the station */
976 for (ac
= 0; ac
< IEEE80211_NUM_ACS
; ac
++) {
977 int count
= skb_queue_len(&pending
), tmp
;
979 skb_queue_splice_tail_init(&sta
->tx_filtered
[ac
], &pending
);
980 tmp
= skb_queue_len(&pending
);
981 filtered
+= tmp
- count
;
984 skb_queue_splice_tail_init(&sta
->ps_tx_buf
[ac
], &pending
);
985 tmp
= skb_queue_len(&pending
);
986 buffered
+= tmp
- count
;
989 ieee80211_add_pending_skbs_fn(local
, &pending
, clear_sta_ps_flags
, sta
);
991 local
->total_ps_buffered
-= buffered
;
993 sta_info_recalc_tim(sta
);
996 "STA %pM aid %d sending %d filtered/%d PS frames since STA not sleeping anymore\n",
997 sta
->sta
.addr
, sta
->sta
.aid
, filtered
, buffered
);
1000 static void ieee80211_send_null_response(struct ieee80211_sub_if_data
*sdata
,
1001 struct sta_info
*sta
, int tid
,
1002 enum ieee80211_frame_release_type reason
)
1004 struct ieee80211_local
*local
= sdata
->local
;
1005 struct ieee80211_qos_hdr
*nullfunc
;
1006 struct sk_buff
*skb
;
1007 int size
= sizeof(*nullfunc
);
1009 bool qos
= test_sta_flag(sta
, WLAN_STA_WME
);
1010 struct ieee80211_tx_info
*info
;
1011 struct ieee80211_chanctx_conf
*chanctx_conf
;
1014 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
|
1015 IEEE80211_STYPE_QOS_NULLFUNC
|
1016 IEEE80211_FCTL_FROMDS
);
1019 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
|
1020 IEEE80211_STYPE_NULLFUNC
|
1021 IEEE80211_FCTL_FROMDS
);
1024 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ size
);
1028 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
1030 nullfunc
= (void *) skb_put(skb
, size
);
1031 nullfunc
->frame_control
= fc
;
1032 nullfunc
->duration_id
= 0;
1033 memcpy(nullfunc
->addr1
, sta
->sta
.addr
, ETH_ALEN
);
1034 memcpy(nullfunc
->addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1035 memcpy(nullfunc
->addr3
, sdata
->vif
.addr
, ETH_ALEN
);
1037 skb
->priority
= tid
;
1038 skb_set_queue_mapping(skb
, ieee802_1d_to_ac
[tid
]);
1040 nullfunc
->qos_ctrl
= cpu_to_le16(tid
);
1042 if (reason
== IEEE80211_FRAME_RELEASE_UAPSD
)
1043 nullfunc
->qos_ctrl
|=
1044 cpu_to_le16(IEEE80211_QOS_CTL_EOSP
);
1047 info
= IEEE80211_SKB_CB(skb
);
1050 * Tell TX path to send this frame even though the
1051 * STA may still remain is PS mode after this frame
1052 * exchange. Also set EOSP to indicate this packet
1053 * ends the poll/service period.
1055 info
->flags
|= IEEE80211_TX_CTL_NO_PS_BUFFER
|
1056 IEEE80211_TX_STATUS_EOSP
|
1057 IEEE80211_TX_CTL_REQ_TX_STATUS
;
1059 drv_allow_buffered_frames(local
, sta
, BIT(tid
), 1, reason
, false);
1062 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
1063 if (WARN_ON(!chanctx_conf
)) {
1069 ieee80211_xmit(sdata
, skb
, chanctx_conf
->channel
->band
);
1074 ieee80211_sta_ps_deliver_response(struct sta_info
*sta
,
1075 int n_frames
, u8 ignored_acs
,
1076 enum ieee80211_frame_release_type reason
)
1078 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
1079 struct ieee80211_local
*local
= sdata
->local
;
1081 bool more_data
= false;
1083 unsigned long driver_release_tids
= 0;
1084 struct sk_buff_head frames
;
1086 /* Service or PS-Poll period starts */
1087 set_sta_flag(sta
, WLAN_STA_SP
);
1089 __skb_queue_head_init(&frames
);
1092 * Get response frame(s) and more data bit for it.
1094 for (ac
= 0; ac
< IEEE80211_NUM_ACS
; ac
++) {
1097 if (ignored_acs
& BIT(ac
))
1100 tids
= ieee80211_tids_for_ac(ac
);
1103 driver_release_tids
= sta
->driver_buffered_tids
& tids
;
1104 if (driver_release_tids
) {
1107 struct sk_buff
*skb
;
1109 while (n_frames
> 0) {
1110 skb
= skb_dequeue(&sta
->tx_filtered
[ac
]);
1113 &sta
->ps_tx_buf
[ac
]);
1115 local
->total_ps_buffered
--;
1121 __skb_queue_tail(&frames
, skb
);
1126 * If the driver has data on more than one TID then
1127 * certainly there's more data if we release just a
1128 * single frame now (from a single TID).
1130 if (reason
== IEEE80211_FRAME_RELEASE_PSPOLL
&&
1131 hweight16(driver_release_tids
) > 1) {
1133 driver_release_tids
=
1134 BIT(ffs(driver_release_tids
) - 1);
1139 if (!skb_queue_empty(&sta
->tx_filtered
[ac
]) ||
1140 !skb_queue_empty(&sta
->ps_tx_buf
[ac
])) {
1150 * For PS-Poll, this can only happen due to a race condition
1151 * when we set the TIM bit and the station notices it, but
1152 * before it can poll for the frame we expire it.
1154 * For uAPSD, this is said in the standard (11.2.1.5 h):
1155 * At each unscheduled SP for a non-AP STA, the AP shall
1156 * attempt to transmit at least one MSDU or MMPDU, but no
1157 * more than the value specified in the Max SP Length field
1158 * in the QoS Capability element from delivery-enabled ACs,
1159 * that are destined for the non-AP STA.
1161 * Since we have no other MSDU/MMPDU, transmit a QoS null frame.
1164 /* This will evaluate to 1, 3, 5 or 7. */
1165 tid
= 7 - ((ffs(~ignored_acs
) - 1) << 1);
1167 ieee80211_send_null_response(sdata
, sta
, tid
, reason
);
1171 if (!driver_release_tids
) {
1172 struct sk_buff_head pending
;
1173 struct sk_buff
*skb
;
1177 skb_queue_head_init(&pending
);
1179 while ((skb
= __skb_dequeue(&frames
))) {
1180 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1181 struct ieee80211_hdr
*hdr
= (void *) skb
->data
;
1187 * Tell TX path to send this frame even though the
1188 * STA may still remain is PS mode after this frame
1191 info
->flags
|= IEEE80211_TX_CTL_NO_PS_BUFFER
;
1194 * Use MoreData flag to indicate whether there are
1195 * more buffered frames for this STA
1197 if (more_data
|| !skb_queue_empty(&frames
))
1198 hdr
->frame_control
|=
1199 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
1201 hdr
->frame_control
&=
1202 cpu_to_le16(~IEEE80211_FCTL_MOREDATA
);
1204 if (ieee80211_is_data_qos(hdr
->frame_control
) ||
1205 ieee80211_is_qos_nullfunc(hdr
->frame_control
))
1206 qoshdr
= ieee80211_get_qos_ctl(hdr
);
1208 /* end service period after last frame */
1209 if (skb_queue_empty(&frames
)) {
1210 if (reason
== IEEE80211_FRAME_RELEASE_UAPSD
&&
1212 *qoshdr
|= IEEE80211_QOS_CTL_EOSP
;
1214 info
->flags
|= IEEE80211_TX_STATUS_EOSP
|
1215 IEEE80211_TX_CTL_REQ_TX_STATUS
;
1219 tids
|= BIT(*qoshdr
& IEEE80211_QOS_CTL_TID_MASK
);
1223 __skb_queue_tail(&pending
, skb
);
1226 drv_allow_buffered_frames(local
, sta
, tids
, num
,
1229 ieee80211_add_pending_skbs(local
, &pending
);
1231 sta_info_recalc_tim(sta
);
1234 * We need to release a frame that is buffered somewhere in the
1235 * driver ... it'll have to handle that.
1236 * Note that, as per the comment above, it'll also have to see
1237 * if there is more than just one frame on the specific TID that
1238 * we're releasing from, and it needs to set the more-data bit
1239 * accordingly if we tell it that there's no more data. If we do
1240 * tell it there's more data, then of course the more-data bit
1241 * needs to be set anyway.
1243 drv_release_buffered_frames(local
, sta
, driver_release_tids
,
1244 n_frames
, reason
, more_data
);
1247 * Note that we don't recalculate the TIM bit here as it would
1248 * most likely have no effect at all unless the driver told us
1249 * that the TID became empty before returning here from the
1251 * Either way, however, when the driver tells us that the TID
1252 * became empty we'll do the TIM recalculation.
1257 void ieee80211_sta_ps_deliver_poll_response(struct sta_info
*sta
)
1259 u8 ignore_for_response
= sta
->sta
.uapsd_queues
;
1262 * If all ACs are delivery-enabled then we should reply
1263 * from any of them, if only some are enabled we reply
1264 * only from the non-enabled ones.
1266 if (ignore_for_response
== BIT(IEEE80211_NUM_ACS
) - 1)
1267 ignore_for_response
= 0;
1269 ieee80211_sta_ps_deliver_response(sta
, 1, ignore_for_response
,
1270 IEEE80211_FRAME_RELEASE_PSPOLL
);
1273 void ieee80211_sta_ps_deliver_uapsd(struct sta_info
*sta
)
1275 int n_frames
= sta
->sta
.max_sp
;
1276 u8 delivery_enabled
= sta
->sta
.uapsd_queues
;
1279 * If we ever grow support for TSPEC this might happen if
1280 * the TSPEC update from hostapd comes in between a trigger
1281 * frame setting WLAN_STA_UAPSD in the RX path and this
1282 * actually getting called.
1284 if (!delivery_enabled
)
1287 switch (sta
->sta
.max_sp
) {
1298 /* XXX: what is a good value? */
1303 ieee80211_sta_ps_deliver_response(sta
, n_frames
, ~delivery_enabled
,
1304 IEEE80211_FRAME_RELEASE_UAPSD
);
1307 void ieee80211_sta_block_awake(struct ieee80211_hw
*hw
,
1308 struct ieee80211_sta
*pubsta
, bool block
)
1310 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
1312 trace_api_sta_block_awake(sta
->local
, pubsta
, block
);
1315 set_sta_flag(sta
, WLAN_STA_PS_DRIVER
);
1316 else if (test_sta_flag(sta
, WLAN_STA_PS_DRIVER
))
1317 ieee80211_queue_work(hw
, &sta
->drv_unblock_wk
);
1319 EXPORT_SYMBOL(ieee80211_sta_block_awake
);
1321 void ieee80211_sta_eosp_irqsafe(struct ieee80211_sta
*pubsta
)
1323 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
1324 struct ieee80211_local
*local
= sta
->local
;
1325 struct sk_buff
*skb
;
1326 struct skb_eosp_msg_data
*data
;
1328 trace_api_eosp(local
, pubsta
);
1330 skb
= alloc_skb(0, GFP_ATOMIC
);
1332 /* too bad ... but race is better than loss */
1333 clear_sta_flag(sta
, WLAN_STA_SP
);
1337 data
= (void *)skb
->cb
;
1338 memcpy(data
->sta
, pubsta
->addr
, ETH_ALEN
);
1339 memcpy(data
->iface
, sta
->sdata
->vif
.addr
, ETH_ALEN
);
1340 skb
->pkt_type
= IEEE80211_EOSP_MSG
;
1341 skb_queue_tail(&local
->skb_queue
, skb
);
1342 tasklet_schedule(&local
->tasklet
);
1344 EXPORT_SYMBOL(ieee80211_sta_eosp_irqsafe
);
1346 void ieee80211_sta_set_buffered(struct ieee80211_sta
*pubsta
,
1347 u8 tid
, bool buffered
)
1349 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
1351 if (WARN_ON(tid
>= STA_TID_NUM
))
1355 set_bit(tid
, &sta
->driver_buffered_tids
);
1357 clear_bit(tid
, &sta
->driver_buffered_tids
);
1359 sta_info_recalc_tim(sta
);
1361 EXPORT_SYMBOL(ieee80211_sta_set_buffered
);
1363 int sta_info_move_state(struct sta_info
*sta
,
1364 enum ieee80211_sta_state new_state
)
1368 if (sta
->sta_state
== new_state
)
1371 /* check allowed transitions first */
1373 switch (new_state
) {
1374 case IEEE80211_STA_NONE
:
1375 if (sta
->sta_state
!= IEEE80211_STA_AUTH
)
1378 case IEEE80211_STA_AUTH
:
1379 if (sta
->sta_state
!= IEEE80211_STA_NONE
&&
1380 sta
->sta_state
!= IEEE80211_STA_ASSOC
)
1383 case IEEE80211_STA_ASSOC
:
1384 if (sta
->sta_state
!= IEEE80211_STA_AUTH
&&
1385 sta
->sta_state
!= IEEE80211_STA_AUTHORIZED
)
1388 case IEEE80211_STA_AUTHORIZED
:
1389 if (sta
->sta_state
!= IEEE80211_STA_ASSOC
)
1393 WARN(1, "invalid state %d", new_state
);
1397 sta_dbg(sta
->sdata
, "moving STA %pM to state %d\n",
1398 sta
->sta
.addr
, new_state
);
1401 * notify the driver before the actual changes so it can
1402 * fail the transition
1404 if (test_sta_flag(sta
, WLAN_STA_INSERTED
)) {
1405 int err
= drv_sta_state(sta
->local
, sta
->sdata
, sta
,
1406 sta
->sta_state
, new_state
);
1411 /* reflect the change in all state variables */
1413 switch (new_state
) {
1414 case IEEE80211_STA_NONE
:
1415 if (sta
->sta_state
== IEEE80211_STA_AUTH
)
1416 clear_bit(WLAN_STA_AUTH
, &sta
->_flags
);
1418 case IEEE80211_STA_AUTH
:
1419 if (sta
->sta_state
== IEEE80211_STA_NONE
)
1420 set_bit(WLAN_STA_AUTH
, &sta
->_flags
);
1421 else if (sta
->sta_state
== IEEE80211_STA_ASSOC
)
1422 clear_bit(WLAN_STA_ASSOC
, &sta
->_flags
);
1424 case IEEE80211_STA_ASSOC
:
1425 if (sta
->sta_state
== IEEE80211_STA_AUTH
) {
1426 set_bit(WLAN_STA_ASSOC
, &sta
->_flags
);
1427 } else if (sta
->sta_state
== IEEE80211_STA_AUTHORIZED
) {
1428 if (sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1429 (sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1430 !sta
->sdata
->u
.vlan
.sta
))
1431 atomic_dec(&sta
->sdata
->bss
->num_mcast_sta
);
1432 clear_bit(WLAN_STA_AUTHORIZED
, &sta
->_flags
);
1435 case IEEE80211_STA_AUTHORIZED
:
1436 if (sta
->sta_state
== IEEE80211_STA_ASSOC
) {
1437 if (sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1438 (sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1439 !sta
->sdata
->u
.vlan
.sta
))
1440 atomic_inc(&sta
->sdata
->bss
->num_mcast_sta
);
1441 set_bit(WLAN_STA_AUTHORIZED
, &sta
->_flags
);
1448 sta
->sta_state
= new_state
;