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 cleanup_single_sta(struct sta_info
*sta
)
97 struct tid_ampdu_tx
*tid_tx
;
98 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
99 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
)) {
110 if (sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
111 sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
112 ps
= &sdata
->bss
->ps
;
116 clear_sta_flag(sta
, WLAN_STA_PS_STA
);
118 atomic_dec(&ps
->num_sta_ps
);
119 sta_info_recalc_tim(sta
);
122 for (ac
= 0; ac
< IEEE80211_NUM_ACS
; ac
++) {
123 local
->total_ps_buffered
-= skb_queue_len(&sta
->ps_tx_buf
[ac
]);
124 ieee80211_purge_tx_queue(&local
->hw
, &sta
->ps_tx_buf
[ac
]);
125 ieee80211_purge_tx_queue(&local
->hw
, &sta
->tx_filtered
[ac
]);
128 #ifdef CONFIG_MAC80211_MESH
129 if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
130 mesh_accept_plinks_update(sdata
);
131 mesh_plink_deactivate(sta
);
132 del_timer_sync(&sta
->plink_timer
);
136 cancel_work_sync(&sta
->drv_unblock_wk
);
139 * Destroy aggregation state here. It would be nice to wait for the
140 * driver to finish aggregation stop and then clean up, but for now
141 * drivers have to handle aggregation stop being requested, followed
142 * directly by station destruction.
144 for (i
= 0; i
< IEEE80211_NUM_TIDS
; i
++) {
145 tid_tx
= rcu_dereference_raw(sta
->ampdu_mlme
.tid_tx
[i
]);
148 ieee80211_purge_tx_queue(&local
->hw
, &tid_tx
->pending
);
152 sta_info_free(local
, sta
);
155 void ieee80211_cleanup_sdata_stas(struct ieee80211_sub_if_data
*sdata
)
157 struct sta_info
*sta
;
159 spin_lock_bh(&sdata
->cleanup_stations_lock
);
160 while (!list_empty(&sdata
->cleanup_stations
)) {
161 sta
= list_first_entry(&sdata
->cleanup_stations
,
162 struct sta_info
, list
);
163 list_del(&sta
->list
);
164 spin_unlock_bh(&sdata
->cleanup_stations_lock
);
166 cleanup_single_sta(sta
);
168 spin_lock_bh(&sdata
->cleanup_stations_lock
);
171 spin_unlock_bh(&sdata
->cleanup_stations_lock
);
174 static void free_sta_rcu(struct rcu_head
*h
)
176 struct sta_info
*sta
= container_of(h
, struct sta_info
, rcu_head
);
177 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
179 spin_lock(&sdata
->cleanup_stations_lock
);
180 list_add_tail(&sta
->list
, &sdata
->cleanup_stations
);
181 spin_unlock(&sdata
->cleanup_stations_lock
);
183 ieee80211_queue_work(&sdata
->local
->hw
, &sdata
->cleanup_stations_wk
);
186 /* protected by RCU */
187 struct sta_info
*sta_info_get(struct ieee80211_sub_if_data
*sdata
,
190 struct ieee80211_local
*local
= sdata
->local
;
191 struct sta_info
*sta
;
193 sta
= rcu_dereference_check(local
->sta_hash
[STA_HASH(addr
)],
194 lockdep_is_held(&local
->sta_mtx
));
196 if (sta
->sdata
== sdata
&&
197 ether_addr_equal(sta
->sta
.addr
, addr
))
199 sta
= rcu_dereference_check(sta
->hnext
,
200 lockdep_is_held(&local
->sta_mtx
));
206 * Get sta info either from the specified interface
207 * or from one of its vlans
209 struct sta_info
*sta_info_get_bss(struct ieee80211_sub_if_data
*sdata
,
212 struct ieee80211_local
*local
= sdata
->local
;
213 struct sta_info
*sta
;
215 sta
= rcu_dereference_check(local
->sta_hash
[STA_HASH(addr
)],
216 lockdep_is_held(&local
->sta_mtx
));
218 if ((sta
->sdata
== sdata
||
219 (sta
->sdata
->bss
&& sta
->sdata
->bss
== sdata
->bss
)) &&
220 ether_addr_equal(sta
->sta
.addr
, addr
))
222 sta
= rcu_dereference_check(sta
->hnext
,
223 lockdep_is_held(&local
->sta_mtx
));
228 struct sta_info
*sta_info_get_by_idx(struct ieee80211_sub_if_data
*sdata
,
231 struct ieee80211_local
*local
= sdata
->local
;
232 struct sta_info
*sta
;
235 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
) {
236 if (sdata
!= sta
->sdata
)
249 * sta_info_free - free STA
251 * @local: pointer to the global information
252 * @sta: STA info to free
254 * This function must undo everything done by sta_info_alloc()
255 * that may happen before sta_info_insert(). It may only be
256 * called when sta_info_insert() has not been attempted (and
257 * if that fails, the station is freed anyway.)
259 void sta_info_free(struct ieee80211_local
*local
, struct sta_info
*sta
)
262 rate_control_free_sta(sta
);
264 sta_dbg(sta
->sdata
, "Destroyed STA %pM\n", sta
->sta
.addr
);
269 /* Caller must hold local->sta_mtx */
270 static void sta_info_hash_add(struct ieee80211_local
*local
,
271 struct sta_info
*sta
)
273 lockdep_assert_held(&local
->sta_mtx
);
274 sta
->hnext
= local
->sta_hash
[STA_HASH(sta
->sta
.addr
)];
275 rcu_assign_pointer(local
->sta_hash
[STA_HASH(sta
->sta
.addr
)], sta
);
278 static void sta_unblock(struct work_struct
*wk
)
280 struct sta_info
*sta
;
282 sta
= container_of(wk
, struct sta_info
, drv_unblock_wk
);
287 if (!test_sta_flag(sta
, WLAN_STA_PS_STA
)) {
289 ieee80211_sta_ps_deliver_wakeup(sta
);
291 } else if (test_and_clear_sta_flag(sta
, WLAN_STA_PSPOLL
)) {
292 clear_sta_flag(sta
, WLAN_STA_PS_DRIVER
);
295 ieee80211_sta_ps_deliver_poll_response(sta
);
297 } else if (test_and_clear_sta_flag(sta
, WLAN_STA_UAPSD
)) {
298 clear_sta_flag(sta
, WLAN_STA_PS_DRIVER
);
301 ieee80211_sta_ps_deliver_uapsd(sta
);
304 clear_sta_flag(sta
, WLAN_STA_PS_DRIVER
);
307 static int sta_prepare_rate_control(struct ieee80211_local
*local
,
308 struct sta_info
*sta
, gfp_t gfp
)
310 if (local
->hw
.flags
& IEEE80211_HW_HAS_RATE_CONTROL
)
313 sta
->rate_ctrl
= local
->rate_ctrl
;
314 sta
->rate_ctrl_priv
= rate_control_alloc_sta(sta
->rate_ctrl
,
316 if (!sta
->rate_ctrl_priv
)
322 struct sta_info
*sta_info_alloc(struct ieee80211_sub_if_data
*sdata
,
323 const u8
*addr
, gfp_t gfp
)
325 struct ieee80211_local
*local
= sdata
->local
;
326 struct sta_info
*sta
;
327 struct timespec uptime
;
330 sta
= kzalloc(sizeof(*sta
) + local
->hw
.sta_data_size
, gfp
);
334 spin_lock_init(&sta
->lock
);
335 INIT_WORK(&sta
->drv_unblock_wk
, sta_unblock
);
336 INIT_WORK(&sta
->ampdu_mlme
.work
, ieee80211_ba_session_work
);
337 mutex_init(&sta
->ampdu_mlme
.mtx
);
339 memcpy(sta
->sta
.addr
, addr
, ETH_ALEN
);
342 sta
->last_rx
= jiffies
;
344 sta
->sta_state
= IEEE80211_STA_NONE
;
346 do_posix_clock_monotonic_gettime(&uptime
);
347 sta
->last_connected
= uptime
.tv_sec
;
348 ewma_init(&sta
->avg_signal
, 1024, 8);
350 if (sta_prepare_rate_control(local
, sta
, gfp
)) {
355 for (i
= 0; i
< IEEE80211_NUM_TIDS
; i
++) {
357 * timer_to_tid must be initialized with identity mapping
358 * to enable session_timer's data differentiation. See
359 * sta_rx_agg_session_timer_expired for usage.
361 sta
->timer_to_tid
[i
] = i
;
363 for (i
= 0; i
< IEEE80211_NUM_ACS
; i
++) {
364 skb_queue_head_init(&sta
->ps_tx_buf
[i
]);
365 skb_queue_head_init(&sta
->tx_filtered
[i
]);
368 for (i
= 0; i
< IEEE80211_NUM_TIDS
; i
++)
369 sta
->last_seq_ctrl
[i
] = cpu_to_le16(USHRT_MAX
);
371 sta_dbg(sdata
, "Allocated STA %pM\n", sta
->sta
.addr
);
373 #ifdef CONFIG_MAC80211_MESH
374 sta
->plink_state
= NL80211_PLINK_LISTEN
;
375 init_timer(&sta
->plink_timer
);
381 static int sta_info_insert_check(struct sta_info
*sta
)
383 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
386 * Can't be a WARN_ON because it can be triggered through a race:
387 * something inserts a STA (on one CPU) without holding the RTNL
388 * and another CPU turns off the net device.
390 if (unlikely(!ieee80211_sdata_running(sdata
)))
393 if (WARN_ON(ether_addr_equal(sta
->sta
.addr
, sdata
->vif
.addr
) ||
394 is_multicast_ether_addr(sta
->sta
.addr
)))
400 static int sta_info_insert_drv_state(struct ieee80211_local
*local
,
401 struct ieee80211_sub_if_data
*sdata
,
402 struct sta_info
*sta
)
404 enum ieee80211_sta_state state
;
407 for (state
= IEEE80211_STA_NOTEXIST
; state
< sta
->sta_state
; state
++) {
408 err
= drv_sta_state(local
, sdata
, sta
, state
, state
+ 1);
415 * Drivers using legacy sta_add/sta_remove callbacks only
416 * get uploaded set to true after sta_add is called.
418 if (!local
->ops
->sta_add
)
419 sta
->uploaded
= true;
423 if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
425 "failed to move IBSS STA %pM to state %d (%d) - keeping it anyway\n",
426 sta
->sta
.addr
, state
+ 1, err
);
430 /* unwind on error */
431 for (; state
> IEEE80211_STA_NOTEXIST
; state
--)
432 WARN_ON(drv_sta_state(local
, sdata
, sta
, state
, state
- 1));
438 * should be called with sta_mtx locked
439 * this function replaces the mutex lock
442 static int sta_info_insert_finish(struct sta_info
*sta
) __acquires(RCU
)
444 struct ieee80211_local
*local
= sta
->local
;
445 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
446 struct station_info sinfo
;
449 lockdep_assert_held(&local
->sta_mtx
);
451 /* check if STA exists already */
452 if (sta_info_get_bss(sdata
, sta
->sta
.addr
)) {
458 err
= sta_info_insert_drv_state(local
, sdata
, sta
);
463 local
->sta_generation
++;
466 /* make the station visible */
467 sta_info_hash_add(local
, sta
);
469 list_add_rcu(&sta
->list
, &local
->sta_list
);
471 set_sta_flag(sta
, WLAN_STA_INSERTED
);
473 ieee80211_sta_debugfs_add(sta
);
474 rate_control_add_sta_debugfs(sta
);
476 memset(&sinfo
, 0, sizeof(sinfo
));
478 sinfo
.generation
= local
->sta_generation
;
479 cfg80211_new_sta(sdata
->dev
, sta
->sta
.addr
, &sinfo
, GFP_KERNEL
);
481 sta_dbg(sdata
, "Inserted STA %pM\n", sta
->sta
.addr
);
483 /* move reference to rcu-protected */
485 mutex_unlock(&local
->sta_mtx
);
487 if (ieee80211_vif_is_mesh(&sdata
->vif
))
488 mesh_accept_plinks_update(sdata
);
492 mutex_unlock(&local
->sta_mtx
);
497 int sta_info_insert_rcu(struct sta_info
*sta
) __acquires(RCU
)
499 struct ieee80211_local
*local
= sta
->local
;
504 err
= sta_info_insert_check(sta
);
510 mutex_lock(&local
->sta_mtx
);
512 err
= sta_info_insert_finish(sta
);
519 sta_info_free(local
, sta
);
523 int sta_info_insert(struct sta_info
*sta
)
525 int err
= sta_info_insert_rcu(sta
);
532 static inline void __bss_tim_set(u8
*tim
, u16 id
)
535 * This format has been mandated by the IEEE specifications,
536 * so this line may not be changed to use the __set_bit() format.
538 tim
[id
/ 8] |= (1 << (id
% 8));
541 static inline void __bss_tim_clear(u8
*tim
, u16 id
)
544 * This format has been mandated by the IEEE specifications,
545 * so this line may not be changed to use the __clear_bit() format.
547 tim
[id
/ 8] &= ~(1 << (id
% 8));
550 static unsigned long ieee80211_tids_for_ac(int ac
)
552 /* If we ever support TIDs > 7, this obviously needs to be adjusted */
554 case IEEE80211_AC_VO
:
555 return BIT(6) | BIT(7);
556 case IEEE80211_AC_VI
:
557 return BIT(4) | BIT(5);
558 case IEEE80211_AC_BE
:
559 return BIT(0) | BIT(3);
560 case IEEE80211_AC_BK
:
561 return BIT(1) | BIT(2);
568 void sta_info_recalc_tim(struct sta_info
*sta
)
570 struct ieee80211_local
*local
= sta
->local
;
573 bool indicate_tim
= false;
574 u8 ignore_for_tim
= sta
->sta
.uapsd_queues
;
578 if (sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
579 sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) {
580 if (WARN_ON_ONCE(!sta
->sdata
->bss
))
583 ps
= &sta
->sdata
->bss
->ps
;
589 /* No need to do anything if the driver does all */
590 if (local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
)
597 * If all ACs are delivery-enabled then we should build
598 * the TIM bit for all ACs anyway; if only some are then
599 * we ignore those and build the TIM bit using only the
602 if (ignore_for_tim
== BIT(IEEE80211_NUM_ACS
) - 1)
605 for (ac
= 0; ac
< IEEE80211_NUM_ACS
; ac
++) {
608 if (ignore_for_tim
& BIT(ac
))
611 indicate_tim
|= !skb_queue_empty(&sta
->tx_filtered
[ac
]) ||
612 !skb_queue_empty(&sta
->ps_tx_buf
[ac
]);
616 tids
= ieee80211_tids_for_ac(ac
);
619 sta
->driver_buffered_tids
& tids
;
623 spin_lock_irqsave(&local
->tim_lock
, flags
);
626 __bss_tim_set(ps
->tim
, id
);
628 __bss_tim_clear(ps
->tim
, id
);
630 if (local
->ops
->set_tim
) {
631 local
->tim_in_locked_section
= true;
632 drv_set_tim(local
, &sta
->sta
, indicate_tim
);
633 local
->tim_in_locked_section
= false;
636 spin_unlock_irqrestore(&local
->tim_lock
, flags
);
639 static bool sta_info_buffer_expired(struct sta_info
*sta
, struct sk_buff
*skb
)
641 struct ieee80211_tx_info
*info
;
647 info
= IEEE80211_SKB_CB(skb
);
649 /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
650 timeout
= (sta
->listen_interval
*
651 sta
->sdata
->vif
.bss_conf
.beacon_int
*
653 if (timeout
< STA_TX_BUFFER_EXPIRE
)
654 timeout
= STA_TX_BUFFER_EXPIRE
;
655 return time_after(jiffies
, info
->control
.jiffies
+ timeout
);
659 static bool sta_info_cleanup_expire_buffered_ac(struct ieee80211_local
*local
,
660 struct sta_info
*sta
, int ac
)
666 * First check for frames that should expire on the filtered
667 * queue. Frames here were rejected by the driver and are on
668 * a separate queue to avoid reordering with normal PS-buffered
669 * frames. They also aren't accounted for right now in the
670 * total_ps_buffered counter.
673 spin_lock_irqsave(&sta
->tx_filtered
[ac
].lock
, flags
);
674 skb
= skb_peek(&sta
->tx_filtered
[ac
]);
675 if (sta_info_buffer_expired(sta
, skb
))
676 skb
= __skb_dequeue(&sta
->tx_filtered
[ac
]);
679 spin_unlock_irqrestore(&sta
->tx_filtered
[ac
].lock
, flags
);
682 * Frames are queued in order, so if this one
683 * hasn't expired yet we can stop testing. If
684 * we actually reached the end of the queue we
685 * also need to stop, of course.
689 ieee80211_free_txskb(&local
->hw
, skb
);
693 * Now also check the normal PS-buffered queue, this will
694 * only find something if the filtered queue was emptied
695 * since the filtered frames are all before the normal PS
699 spin_lock_irqsave(&sta
->ps_tx_buf
[ac
].lock
, flags
);
700 skb
= skb_peek(&sta
->ps_tx_buf
[ac
]);
701 if (sta_info_buffer_expired(sta
, skb
))
702 skb
= __skb_dequeue(&sta
->ps_tx_buf
[ac
]);
705 spin_unlock_irqrestore(&sta
->ps_tx_buf
[ac
].lock
, flags
);
708 * frames are queued in order, so if this one
709 * hasn't expired yet (or we reached the end of
710 * the queue) we can stop testing
715 local
->total_ps_buffered
--;
716 ps_dbg(sta
->sdata
, "Buffered frame expired (STA %pM)\n",
718 ieee80211_free_txskb(&local
->hw
, skb
);
722 * Finally, recalculate the TIM bit for this station -- it might
723 * now be clear because the station was too slow to retrieve its
726 sta_info_recalc_tim(sta
);
729 * Return whether there are any frames still buffered, this is
730 * used to check whether the cleanup timer still needs to run,
731 * if there are no frames we don't need to rearm the timer.
733 return !(skb_queue_empty(&sta
->ps_tx_buf
[ac
]) &&
734 skb_queue_empty(&sta
->tx_filtered
[ac
]));
737 static bool sta_info_cleanup_expire_buffered(struct ieee80211_local
*local
,
738 struct sta_info
*sta
)
740 bool have_buffered
= false;
743 /* This is only necessary for stations on BSS interfaces */
744 if (!sta
->sdata
->bss
)
747 for (ac
= 0; ac
< IEEE80211_NUM_ACS
; ac
++)
749 sta_info_cleanup_expire_buffered_ac(local
, sta
, ac
);
751 return have_buffered
;
754 int __must_check
__sta_info_destroy(struct sta_info
*sta
)
756 struct ieee80211_local
*local
;
757 struct ieee80211_sub_if_data
*sdata
;
768 lockdep_assert_held(&local
->sta_mtx
);
771 * Before removing the station from the driver and
772 * rate control, it might still start new aggregation
773 * sessions -- block that to make sure the tear-down
774 * will be sufficient.
776 set_sta_flag(sta
, WLAN_STA_BLOCK_BA
);
777 ieee80211_sta_tear_down_BA_sessions(sta
, false);
779 ret
= sta_info_hash_del(local
, sta
);
783 list_del_rcu(&sta
->list
);
785 mutex_lock(&local
->key_mtx
);
786 for (i
= 0; i
< NUM_DEFAULT_KEYS
; i
++)
787 __ieee80211_key_free(key_mtx_dereference(local
, sta
->gtk
[i
]));
789 __ieee80211_key_free(key_mtx_dereference(local
, sta
->ptk
));
790 mutex_unlock(&local
->key_mtx
);
795 local
->sta_generation
++;
797 if (sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
798 RCU_INIT_POINTER(sdata
->u
.vlan
.sta
, NULL
);
800 while (sta
->sta_state
> IEEE80211_STA_NONE
) {
801 ret
= sta_info_move_state(sta
, sta
->sta_state
- 1);
809 ret
= drv_sta_state(local
, sdata
, sta
, IEEE80211_STA_NONE
,
810 IEEE80211_STA_NOTEXIST
);
811 WARN_ON_ONCE(ret
!= 0);
814 sta_dbg(sdata
, "Removed STA %pM\n", sta
->sta
.addr
);
816 cfg80211_del_sta(sdata
->dev
, sta
->sta
.addr
, GFP_KERNEL
);
818 rate_control_remove_sta_debugfs(sta
);
819 ieee80211_sta_debugfs_remove(sta
);
821 call_rcu(&sta
->rcu_head
, free_sta_rcu
);
826 int sta_info_destroy_addr(struct ieee80211_sub_if_data
*sdata
, const u8
*addr
)
828 struct sta_info
*sta
;
831 mutex_lock(&sdata
->local
->sta_mtx
);
832 sta
= sta_info_get(sdata
, addr
);
833 ret
= __sta_info_destroy(sta
);
834 mutex_unlock(&sdata
->local
->sta_mtx
);
839 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data
*sdata
,
842 struct sta_info
*sta
;
845 mutex_lock(&sdata
->local
->sta_mtx
);
846 sta
= sta_info_get_bss(sdata
, addr
);
847 ret
= __sta_info_destroy(sta
);
848 mutex_unlock(&sdata
->local
->sta_mtx
);
853 static void sta_info_cleanup(unsigned long data
)
855 struct ieee80211_local
*local
= (struct ieee80211_local
*) data
;
856 struct sta_info
*sta
;
857 bool timer_needed
= false;
860 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
)
861 if (sta_info_cleanup_expire_buffered(local
, sta
))
865 if (local
->quiescing
)
871 mod_timer(&local
->sta_cleanup
,
872 round_jiffies(jiffies
+ STA_INFO_CLEANUP_INTERVAL
));
875 void sta_info_init(struct ieee80211_local
*local
)
877 spin_lock_init(&local
->tim_lock
);
878 mutex_init(&local
->sta_mtx
);
879 INIT_LIST_HEAD(&local
->sta_list
);
881 setup_timer(&local
->sta_cleanup
, sta_info_cleanup
,
882 (unsigned long)local
);
885 void sta_info_stop(struct ieee80211_local
*local
)
887 del_timer_sync(&local
->sta_cleanup
);
888 sta_info_flush(local
, NULL
);
892 * sta_info_flush - flush matching STA entries from the STA table
894 * Returns the number of removed STA entries.
896 * @local: local interface data
897 * @sdata: matching rule for the net device (sta->dev) or %NULL to match all STAs
899 int sta_info_flush(struct ieee80211_local
*local
,
900 struct ieee80211_sub_if_data
*sdata
)
902 struct sta_info
*sta
, *tmp
;
907 mutex_lock(&local
->sta_mtx
);
908 list_for_each_entry_safe(sta
, tmp
, &local
->sta_list
, list
) {
909 if (!sdata
|| sdata
== sta
->sdata
) {
910 WARN_ON(__sta_info_destroy(sta
));
914 mutex_unlock(&local
->sta_mtx
);
919 ieee80211_cleanup_sdata_stas(sdata
);
920 cancel_work_sync(&sdata
->cleanup_stations_wk
);
922 mutex_lock(&local
->iflist_mtx
);
923 list_for_each_entry(sdata
, &local
->interfaces
, list
) {
924 ieee80211_cleanup_sdata_stas(sdata
);
925 cancel_work_sync(&sdata
->cleanup_stations_wk
);
927 mutex_unlock(&local
->iflist_mtx
);
933 void ieee80211_sta_expire(struct ieee80211_sub_if_data
*sdata
,
934 unsigned long exp_time
)
936 struct ieee80211_local
*local
= sdata
->local
;
937 struct sta_info
*sta
, *tmp
;
939 mutex_lock(&local
->sta_mtx
);
941 list_for_each_entry_safe(sta
, tmp
, &local
->sta_list
, list
) {
942 if (sdata
!= sta
->sdata
)
945 if (time_after(jiffies
, sta
->last_rx
+ exp_time
)) {
946 sta_dbg(sta
->sdata
, "expiring inactive STA %pM\n",
948 WARN_ON(__sta_info_destroy(sta
));
952 mutex_unlock(&local
->sta_mtx
);
955 struct ieee80211_sta
*ieee80211_find_sta_by_ifaddr(struct ieee80211_hw
*hw
,
959 struct sta_info
*sta
, *nxt
;
962 * Just return a random station if localaddr is NULL
965 for_each_sta_info(hw_to_local(hw
), addr
, sta
, nxt
) {
967 !ether_addr_equal(sta
->sdata
->vif
.addr
, localaddr
))
976 EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr
);
978 struct ieee80211_sta
*ieee80211_find_sta(struct ieee80211_vif
*vif
,
981 struct sta_info
*sta
;
986 sta
= sta_info_get_bss(vif_to_sdata(vif
), addr
);
995 EXPORT_SYMBOL(ieee80211_find_sta
);
997 static void clear_sta_ps_flags(void *_sta
)
999 struct sta_info
*sta
= _sta
;
1000 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
1003 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1004 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
1005 ps
= &sdata
->bss
->ps
;
1009 clear_sta_flag(sta
, WLAN_STA_PS_DRIVER
);
1010 if (test_and_clear_sta_flag(sta
, WLAN_STA_PS_STA
))
1011 atomic_dec(&ps
->num_sta_ps
);
1014 /* powersave support code */
1015 void ieee80211_sta_ps_deliver_wakeup(struct sta_info
*sta
)
1017 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
1018 struct ieee80211_local
*local
= sdata
->local
;
1019 struct sk_buff_head pending
;
1020 int filtered
= 0, buffered
= 0, ac
;
1021 unsigned long flags
;
1023 clear_sta_flag(sta
, WLAN_STA_SP
);
1025 BUILD_BUG_ON(BITS_TO_LONGS(IEEE80211_NUM_TIDS
) > 1);
1026 sta
->driver_buffered_tids
= 0;
1028 if (!(local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
))
1029 drv_sta_notify(local
, sdata
, STA_NOTIFY_AWAKE
, &sta
->sta
);
1031 skb_queue_head_init(&pending
);
1033 /* Send all buffered frames to the station */
1034 for (ac
= 0; ac
< IEEE80211_NUM_ACS
; ac
++) {
1035 int count
= skb_queue_len(&pending
), tmp
;
1037 spin_lock_irqsave(&sta
->tx_filtered
[ac
].lock
, flags
);
1038 skb_queue_splice_tail_init(&sta
->tx_filtered
[ac
], &pending
);
1039 spin_unlock_irqrestore(&sta
->tx_filtered
[ac
].lock
, flags
);
1040 tmp
= skb_queue_len(&pending
);
1041 filtered
+= tmp
- count
;
1044 spin_lock_irqsave(&sta
->ps_tx_buf
[ac
].lock
, flags
);
1045 skb_queue_splice_tail_init(&sta
->ps_tx_buf
[ac
], &pending
);
1046 spin_unlock_irqrestore(&sta
->ps_tx_buf
[ac
].lock
, flags
);
1047 tmp
= skb_queue_len(&pending
);
1048 buffered
+= tmp
- count
;
1051 ieee80211_add_pending_skbs_fn(local
, &pending
, clear_sta_ps_flags
, sta
);
1053 local
->total_ps_buffered
-= buffered
;
1055 sta_info_recalc_tim(sta
);
1058 "STA %pM aid %d sending %d filtered/%d PS frames since STA not sleeping anymore\n",
1059 sta
->sta
.addr
, sta
->sta
.aid
, filtered
, buffered
);
1062 static void ieee80211_send_null_response(struct ieee80211_sub_if_data
*sdata
,
1063 struct sta_info
*sta
, int tid
,
1064 enum ieee80211_frame_release_type reason
)
1066 struct ieee80211_local
*local
= sdata
->local
;
1067 struct ieee80211_qos_hdr
*nullfunc
;
1068 struct sk_buff
*skb
;
1069 int size
= sizeof(*nullfunc
);
1071 bool qos
= test_sta_flag(sta
, WLAN_STA_WME
);
1072 struct ieee80211_tx_info
*info
;
1073 struct ieee80211_chanctx_conf
*chanctx_conf
;
1076 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
|
1077 IEEE80211_STYPE_QOS_NULLFUNC
|
1078 IEEE80211_FCTL_FROMDS
);
1081 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
|
1082 IEEE80211_STYPE_NULLFUNC
|
1083 IEEE80211_FCTL_FROMDS
);
1086 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ size
);
1090 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
1092 nullfunc
= (void *) skb_put(skb
, size
);
1093 nullfunc
->frame_control
= fc
;
1094 nullfunc
->duration_id
= 0;
1095 memcpy(nullfunc
->addr1
, sta
->sta
.addr
, ETH_ALEN
);
1096 memcpy(nullfunc
->addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1097 memcpy(nullfunc
->addr3
, sdata
->vif
.addr
, ETH_ALEN
);
1099 skb
->priority
= tid
;
1100 skb_set_queue_mapping(skb
, ieee802_1d_to_ac
[tid
]);
1102 nullfunc
->qos_ctrl
= cpu_to_le16(tid
);
1104 if (reason
== IEEE80211_FRAME_RELEASE_UAPSD
)
1105 nullfunc
->qos_ctrl
|=
1106 cpu_to_le16(IEEE80211_QOS_CTL_EOSP
);
1109 info
= IEEE80211_SKB_CB(skb
);
1112 * Tell TX path to send this frame even though the
1113 * STA may still remain is PS mode after this frame
1114 * exchange. Also set EOSP to indicate this packet
1115 * ends the poll/service period.
1117 info
->flags
|= IEEE80211_TX_CTL_NO_PS_BUFFER
|
1118 IEEE80211_TX_STATUS_EOSP
|
1119 IEEE80211_TX_CTL_REQ_TX_STATUS
;
1121 drv_allow_buffered_frames(local
, sta
, BIT(tid
), 1, reason
, false);
1124 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
1125 if (WARN_ON(!chanctx_conf
)) {
1131 ieee80211_xmit(sdata
, skb
, chanctx_conf
->def
.chan
->band
);
1136 ieee80211_sta_ps_deliver_response(struct sta_info
*sta
,
1137 int n_frames
, u8 ignored_acs
,
1138 enum ieee80211_frame_release_type reason
)
1140 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
1141 struct ieee80211_local
*local
= sdata
->local
;
1143 bool more_data
= false;
1145 unsigned long driver_release_tids
= 0;
1146 struct sk_buff_head frames
;
1148 /* Service or PS-Poll period starts */
1149 set_sta_flag(sta
, WLAN_STA_SP
);
1151 __skb_queue_head_init(&frames
);
1154 * Get response frame(s) and more data bit for it.
1156 for (ac
= 0; ac
< IEEE80211_NUM_ACS
; ac
++) {
1159 if (ignored_acs
& BIT(ac
))
1162 tids
= ieee80211_tids_for_ac(ac
);
1165 driver_release_tids
= sta
->driver_buffered_tids
& tids
;
1166 if (driver_release_tids
) {
1169 struct sk_buff
*skb
;
1171 while (n_frames
> 0) {
1172 skb
= skb_dequeue(&sta
->tx_filtered
[ac
]);
1175 &sta
->ps_tx_buf
[ac
]);
1177 local
->total_ps_buffered
--;
1183 __skb_queue_tail(&frames
, skb
);
1188 * If the driver has data on more than one TID then
1189 * certainly there's more data if we release just a
1190 * single frame now (from a single TID).
1192 if (reason
== IEEE80211_FRAME_RELEASE_PSPOLL
&&
1193 hweight16(driver_release_tids
) > 1) {
1195 driver_release_tids
=
1196 BIT(ffs(driver_release_tids
) - 1);
1201 if (!skb_queue_empty(&sta
->tx_filtered
[ac
]) ||
1202 !skb_queue_empty(&sta
->ps_tx_buf
[ac
])) {
1212 * For PS-Poll, this can only happen due to a race condition
1213 * when we set the TIM bit and the station notices it, but
1214 * before it can poll for the frame we expire it.
1216 * For uAPSD, this is said in the standard (11.2.1.5 h):
1217 * At each unscheduled SP for a non-AP STA, the AP shall
1218 * attempt to transmit at least one MSDU or MMPDU, but no
1219 * more than the value specified in the Max SP Length field
1220 * in the QoS Capability element from delivery-enabled ACs,
1221 * that are destined for the non-AP STA.
1223 * Since we have no other MSDU/MMPDU, transmit a QoS null frame.
1226 /* This will evaluate to 1, 3, 5 or 7. */
1227 tid
= 7 - ((ffs(~ignored_acs
) - 1) << 1);
1229 ieee80211_send_null_response(sdata
, sta
, tid
, reason
);
1233 if (!driver_release_tids
) {
1234 struct sk_buff_head pending
;
1235 struct sk_buff
*skb
;
1239 skb_queue_head_init(&pending
);
1241 while ((skb
= __skb_dequeue(&frames
))) {
1242 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1243 struct ieee80211_hdr
*hdr
= (void *) skb
->data
;
1249 * Tell TX path to send this frame even though the
1250 * STA may still remain is PS mode after this frame
1253 info
->flags
|= IEEE80211_TX_CTL_NO_PS_BUFFER
;
1256 * Use MoreData flag to indicate whether there are
1257 * more buffered frames for this STA
1259 if (more_data
|| !skb_queue_empty(&frames
))
1260 hdr
->frame_control
|=
1261 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
1263 hdr
->frame_control
&=
1264 cpu_to_le16(~IEEE80211_FCTL_MOREDATA
);
1266 if (ieee80211_is_data_qos(hdr
->frame_control
) ||
1267 ieee80211_is_qos_nullfunc(hdr
->frame_control
))
1268 qoshdr
= ieee80211_get_qos_ctl(hdr
);
1270 /* end service period after last frame */
1271 if (skb_queue_empty(&frames
)) {
1272 if (reason
== IEEE80211_FRAME_RELEASE_UAPSD
&&
1274 *qoshdr
|= IEEE80211_QOS_CTL_EOSP
;
1276 info
->flags
|= IEEE80211_TX_STATUS_EOSP
|
1277 IEEE80211_TX_CTL_REQ_TX_STATUS
;
1281 tids
|= BIT(*qoshdr
& IEEE80211_QOS_CTL_TID_MASK
);
1285 __skb_queue_tail(&pending
, skb
);
1288 drv_allow_buffered_frames(local
, sta
, tids
, num
,
1291 ieee80211_add_pending_skbs(local
, &pending
);
1293 sta_info_recalc_tim(sta
);
1296 * We need to release a frame that is buffered somewhere in the
1297 * driver ... it'll have to handle that.
1298 * Note that, as per the comment above, it'll also have to see
1299 * if there is more than just one frame on the specific TID that
1300 * we're releasing from, and it needs to set the more-data bit
1301 * accordingly if we tell it that there's no more data. If we do
1302 * tell it there's more data, then of course the more-data bit
1303 * needs to be set anyway.
1305 drv_release_buffered_frames(local
, sta
, driver_release_tids
,
1306 n_frames
, reason
, more_data
);
1309 * Note that we don't recalculate the TIM bit here as it would
1310 * most likely have no effect at all unless the driver told us
1311 * that the TID became empty before returning here from the
1313 * Either way, however, when the driver tells us that the TID
1314 * became empty we'll do the TIM recalculation.
1319 void ieee80211_sta_ps_deliver_poll_response(struct sta_info
*sta
)
1321 u8 ignore_for_response
= sta
->sta
.uapsd_queues
;
1324 * If all ACs are delivery-enabled then we should reply
1325 * from any of them, if only some are enabled we reply
1326 * only from the non-enabled ones.
1328 if (ignore_for_response
== BIT(IEEE80211_NUM_ACS
) - 1)
1329 ignore_for_response
= 0;
1331 ieee80211_sta_ps_deliver_response(sta
, 1, ignore_for_response
,
1332 IEEE80211_FRAME_RELEASE_PSPOLL
);
1335 void ieee80211_sta_ps_deliver_uapsd(struct sta_info
*sta
)
1337 int n_frames
= sta
->sta
.max_sp
;
1338 u8 delivery_enabled
= sta
->sta
.uapsd_queues
;
1341 * If we ever grow support for TSPEC this might happen if
1342 * the TSPEC update from hostapd comes in between a trigger
1343 * frame setting WLAN_STA_UAPSD in the RX path and this
1344 * actually getting called.
1346 if (!delivery_enabled
)
1349 switch (sta
->sta
.max_sp
) {
1360 /* XXX: what is a good value? */
1365 ieee80211_sta_ps_deliver_response(sta
, n_frames
, ~delivery_enabled
,
1366 IEEE80211_FRAME_RELEASE_UAPSD
);
1369 void ieee80211_sta_block_awake(struct ieee80211_hw
*hw
,
1370 struct ieee80211_sta
*pubsta
, bool block
)
1372 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
1374 trace_api_sta_block_awake(sta
->local
, pubsta
, block
);
1377 set_sta_flag(sta
, WLAN_STA_PS_DRIVER
);
1378 else if (test_sta_flag(sta
, WLAN_STA_PS_DRIVER
))
1379 ieee80211_queue_work(hw
, &sta
->drv_unblock_wk
);
1381 EXPORT_SYMBOL(ieee80211_sta_block_awake
);
1383 void ieee80211_sta_eosp_irqsafe(struct ieee80211_sta
*pubsta
)
1385 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
1386 struct ieee80211_local
*local
= sta
->local
;
1387 struct sk_buff
*skb
;
1388 struct skb_eosp_msg_data
*data
;
1390 trace_api_eosp(local
, pubsta
);
1392 skb
= alloc_skb(0, GFP_ATOMIC
);
1394 /* too bad ... but race is better than loss */
1395 clear_sta_flag(sta
, WLAN_STA_SP
);
1399 data
= (void *)skb
->cb
;
1400 memcpy(data
->sta
, pubsta
->addr
, ETH_ALEN
);
1401 memcpy(data
->iface
, sta
->sdata
->vif
.addr
, ETH_ALEN
);
1402 skb
->pkt_type
= IEEE80211_EOSP_MSG
;
1403 skb_queue_tail(&local
->skb_queue
, skb
);
1404 tasklet_schedule(&local
->tasklet
);
1406 EXPORT_SYMBOL(ieee80211_sta_eosp_irqsafe
);
1408 void ieee80211_sta_set_buffered(struct ieee80211_sta
*pubsta
,
1409 u8 tid
, bool buffered
)
1411 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
1413 if (WARN_ON(tid
>= IEEE80211_NUM_TIDS
))
1417 set_bit(tid
, &sta
->driver_buffered_tids
);
1419 clear_bit(tid
, &sta
->driver_buffered_tids
);
1421 sta_info_recalc_tim(sta
);
1423 EXPORT_SYMBOL(ieee80211_sta_set_buffered
);
1425 int sta_info_move_state(struct sta_info
*sta
,
1426 enum ieee80211_sta_state new_state
)
1430 if (sta
->sta_state
== new_state
)
1433 /* check allowed transitions first */
1435 switch (new_state
) {
1436 case IEEE80211_STA_NONE
:
1437 if (sta
->sta_state
!= IEEE80211_STA_AUTH
)
1440 case IEEE80211_STA_AUTH
:
1441 if (sta
->sta_state
!= IEEE80211_STA_NONE
&&
1442 sta
->sta_state
!= IEEE80211_STA_ASSOC
)
1445 case IEEE80211_STA_ASSOC
:
1446 if (sta
->sta_state
!= IEEE80211_STA_AUTH
&&
1447 sta
->sta_state
!= IEEE80211_STA_AUTHORIZED
)
1450 case IEEE80211_STA_AUTHORIZED
:
1451 if (sta
->sta_state
!= IEEE80211_STA_ASSOC
)
1455 WARN(1, "invalid state %d", new_state
);
1459 sta_dbg(sta
->sdata
, "moving STA %pM to state %d\n",
1460 sta
->sta
.addr
, new_state
);
1463 * notify the driver before the actual changes so it can
1464 * fail the transition
1466 if (test_sta_flag(sta
, WLAN_STA_INSERTED
)) {
1467 int err
= drv_sta_state(sta
->local
, sta
->sdata
, sta
,
1468 sta
->sta_state
, new_state
);
1473 /* reflect the change in all state variables */
1475 switch (new_state
) {
1476 case IEEE80211_STA_NONE
:
1477 if (sta
->sta_state
== IEEE80211_STA_AUTH
)
1478 clear_bit(WLAN_STA_AUTH
, &sta
->_flags
);
1480 case IEEE80211_STA_AUTH
:
1481 if (sta
->sta_state
== IEEE80211_STA_NONE
)
1482 set_bit(WLAN_STA_AUTH
, &sta
->_flags
);
1483 else if (sta
->sta_state
== IEEE80211_STA_ASSOC
)
1484 clear_bit(WLAN_STA_ASSOC
, &sta
->_flags
);
1486 case IEEE80211_STA_ASSOC
:
1487 if (sta
->sta_state
== IEEE80211_STA_AUTH
) {
1488 set_bit(WLAN_STA_ASSOC
, &sta
->_flags
);
1489 } else if (sta
->sta_state
== IEEE80211_STA_AUTHORIZED
) {
1490 if (sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1491 (sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1492 !sta
->sdata
->u
.vlan
.sta
))
1493 atomic_dec(&sta
->sdata
->bss
->num_mcast_sta
);
1494 clear_bit(WLAN_STA_AUTHORIZED
, &sta
->_flags
);
1497 case IEEE80211_STA_AUTHORIZED
:
1498 if (sta
->sta_state
== IEEE80211_STA_ASSOC
) {
1499 if (sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1500 (sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1501 !sta
->sdata
->u
.vlan
.sta
))
1502 atomic_inc(&sta
->sdata
->bss
->num_mcast_sta
);
1503 set_bit(WLAN_STA_AUTHORIZED
, &sta
->_flags
);
1510 sta
->sta_state
= new_state
;