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.
108 * Note though that this still uses the sdata and even
109 * calls the driver in AP and mesh mode, so interfaces
110 * of those types mush use call sta_info_flush_cleanup()
111 * (typically via sta_info_flush()) before deconfiguring
114 * In station mode, nothing happens here so it doesn't
115 * have to (and doesn't) do that, this is intentional to
119 if (test_sta_flag(sta
, WLAN_STA_PS_STA
)) {
120 if (sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
121 sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
122 ps
= &sdata
->bss
->ps
;
123 else if (ieee80211_vif_is_mesh(&sdata
->vif
))
124 ps
= &sdata
->u
.mesh
.ps
;
128 clear_sta_flag(sta
, WLAN_STA_PS_STA
);
130 atomic_dec(&ps
->num_sta_ps
);
131 sta_info_recalc_tim(sta
);
134 for (ac
= 0; ac
< IEEE80211_NUM_ACS
; ac
++) {
135 local
->total_ps_buffered
-= skb_queue_len(&sta
->ps_tx_buf
[ac
]);
136 ieee80211_purge_tx_queue(&local
->hw
, &sta
->ps_tx_buf
[ac
]);
137 ieee80211_purge_tx_queue(&local
->hw
, &sta
->tx_filtered
[ac
]);
140 if (ieee80211_vif_is_mesh(&sdata
->vif
))
141 mesh_sta_cleanup(sta
);
143 cancel_work_sync(&sta
->drv_unblock_wk
);
146 * Destroy aggregation state here. It would be nice to wait for the
147 * driver to finish aggregation stop and then clean up, but for now
148 * drivers have to handle aggregation stop being requested, followed
149 * directly by station destruction.
151 for (i
= 0; i
< IEEE80211_NUM_TIDS
; i
++) {
152 tid_tx
= rcu_dereference_raw(sta
->ampdu_mlme
.tid_tx
[i
]);
155 ieee80211_purge_tx_queue(&local
->hw
, &tid_tx
->pending
);
159 sta_info_free(local
, sta
);
162 void ieee80211_cleanup_sdata_stas(struct ieee80211_sub_if_data
*sdata
)
164 struct sta_info
*sta
;
166 spin_lock_bh(&sdata
->cleanup_stations_lock
);
167 while (!list_empty(&sdata
->cleanup_stations
)) {
168 sta
= list_first_entry(&sdata
->cleanup_stations
,
169 struct sta_info
, list
);
170 list_del(&sta
->list
);
171 spin_unlock_bh(&sdata
->cleanup_stations_lock
);
173 cleanup_single_sta(sta
);
175 spin_lock_bh(&sdata
->cleanup_stations_lock
);
178 spin_unlock_bh(&sdata
->cleanup_stations_lock
);
181 static void free_sta_rcu(struct rcu_head
*h
)
183 struct sta_info
*sta
= container_of(h
, struct sta_info
, rcu_head
);
184 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
186 spin_lock(&sdata
->cleanup_stations_lock
);
187 list_add_tail(&sta
->list
, &sdata
->cleanup_stations
);
188 spin_unlock(&sdata
->cleanup_stations_lock
);
190 ieee80211_queue_work(&sdata
->local
->hw
, &sdata
->cleanup_stations_wk
);
193 /* protected by RCU */
194 struct sta_info
*sta_info_get(struct ieee80211_sub_if_data
*sdata
,
197 struct ieee80211_local
*local
= sdata
->local
;
198 struct sta_info
*sta
;
200 sta
= rcu_dereference_check(local
->sta_hash
[STA_HASH(addr
)],
201 lockdep_is_held(&local
->sta_mtx
));
203 if (sta
->sdata
== sdata
&&
204 ether_addr_equal(sta
->sta
.addr
, addr
))
206 sta
= rcu_dereference_check(sta
->hnext
,
207 lockdep_is_held(&local
->sta_mtx
));
213 * Get sta info either from the specified interface
214 * or from one of its vlans
216 struct sta_info
*sta_info_get_bss(struct ieee80211_sub_if_data
*sdata
,
219 struct ieee80211_local
*local
= sdata
->local
;
220 struct sta_info
*sta
;
222 sta
= rcu_dereference_check(local
->sta_hash
[STA_HASH(addr
)],
223 lockdep_is_held(&local
->sta_mtx
));
225 if ((sta
->sdata
== sdata
||
226 (sta
->sdata
->bss
&& sta
->sdata
->bss
== sdata
->bss
)) &&
227 ether_addr_equal(sta
->sta
.addr
, addr
))
229 sta
= rcu_dereference_check(sta
->hnext
,
230 lockdep_is_held(&local
->sta_mtx
));
235 struct sta_info
*sta_info_get_by_idx(struct ieee80211_sub_if_data
*sdata
,
238 struct ieee80211_local
*local
= sdata
->local
;
239 struct sta_info
*sta
;
242 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
) {
243 if (sdata
!= sta
->sdata
)
256 * sta_info_free - free STA
258 * @local: pointer to the global information
259 * @sta: STA info to free
261 * This function must undo everything done by sta_info_alloc()
262 * that may happen before sta_info_insert(). It may only be
263 * called when sta_info_insert() has not been attempted (and
264 * if that fails, the station is freed anyway.)
266 void sta_info_free(struct ieee80211_local
*local
, struct sta_info
*sta
)
269 rate_control_free_sta(sta
);
271 sta_dbg(sta
->sdata
, "Destroyed STA %pM\n", sta
->sta
.addr
);
276 /* Caller must hold local->sta_mtx */
277 static void sta_info_hash_add(struct ieee80211_local
*local
,
278 struct sta_info
*sta
)
280 lockdep_assert_held(&local
->sta_mtx
);
281 sta
->hnext
= local
->sta_hash
[STA_HASH(sta
->sta
.addr
)];
282 rcu_assign_pointer(local
->sta_hash
[STA_HASH(sta
->sta
.addr
)], sta
);
285 static void sta_unblock(struct work_struct
*wk
)
287 struct sta_info
*sta
;
289 sta
= container_of(wk
, struct sta_info
, drv_unblock_wk
);
294 if (!test_sta_flag(sta
, WLAN_STA_PS_STA
)) {
296 ieee80211_sta_ps_deliver_wakeup(sta
);
298 } else if (test_and_clear_sta_flag(sta
, WLAN_STA_PSPOLL
)) {
299 clear_sta_flag(sta
, WLAN_STA_PS_DRIVER
);
302 ieee80211_sta_ps_deliver_poll_response(sta
);
304 } else if (test_and_clear_sta_flag(sta
, WLAN_STA_UAPSD
)) {
305 clear_sta_flag(sta
, WLAN_STA_PS_DRIVER
);
308 ieee80211_sta_ps_deliver_uapsd(sta
);
311 clear_sta_flag(sta
, WLAN_STA_PS_DRIVER
);
314 static int sta_prepare_rate_control(struct ieee80211_local
*local
,
315 struct sta_info
*sta
, gfp_t gfp
)
317 if (local
->hw
.flags
& IEEE80211_HW_HAS_RATE_CONTROL
)
320 sta
->rate_ctrl
= local
->rate_ctrl
;
321 sta
->rate_ctrl_priv
= rate_control_alloc_sta(sta
->rate_ctrl
,
323 if (!sta
->rate_ctrl_priv
)
329 struct sta_info
*sta_info_alloc(struct ieee80211_sub_if_data
*sdata
,
330 const u8
*addr
, gfp_t gfp
)
332 struct ieee80211_local
*local
= sdata
->local
;
333 struct sta_info
*sta
;
334 struct timespec uptime
;
337 sta
= kzalloc(sizeof(*sta
) + local
->hw
.sta_data_size
, gfp
);
341 spin_lock_init(&sta
->lock
);
342 INIT_WORK(&sta
->drv_unblock_wk
, sta_unblock
);
343 INIT_WORK(&sta
->ampdu_mlme
.work
, ieee80211_ba_session_work
);
344 mutex_init(&sta
->ampdu_mlme
.mtx
);
345 #ifdef CONFIG_MAC80211_MESH
346 if (ieee80211_vif_is_mesh(&sdata
->vif
) &&
347 !sdata
->u
.mesh
.user_mpm
)
348 init_timer(&sta
->plink_timer
);
351 memcpy(sta
->sta
.addr
, addr
, ETH_ALEN
);
354 sta
->last_rx
= jiffies
;
356 sta
->sta_state
= IEEE80211_STA_NONE
;
358 do_posix_clock_monotonic_gettime(&uptime
);
359 sta
->last_connected
= uptime
.tv_sec
;
360 ewma_init(&sta
->avg_signal
, 1024, 8);
362 if (sta_prepare_rate_control(local
, sta
, gfp
)) {
367 for (i
= 0; i
< IEEE80211_NUM_TIDS
; i
++) {
369 * timer_to_tid must be initialized with identity mapping
370 * to enable session_timer's data differentiation. See
371 * sta_rx_agg_session_timer_expired for usage.
373 sta
->timer_to_tid
[i
] = i
;
375 for (i
= 0; i
< IEEE80211_NUM_ACS
; i
++) {
376 skb_queue_head_init(&sta
->ps_tx_buf
[i
]);
377 skb_queue_head_init(&sta
->tx_filtered
[i
]);
380 for (i
= 0; i
< IEEE80211_NUM_TIDS
; i
++)
381 sta
->last_seq_ctrl
[i
] = cpu_to_le16(USHRT_MAX
);
383 sta
->sta
.smps_mode
= IEEE80211_SMPS_OFF
;
385 sta_dbg(sdata
, "Allocated STA %pM\n", sta
->sta
.addr
);
390 static int sta_info_insert_check(struct sta_info
*sta
)
392 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
395 * Can't be a WARN_ON because it can be triggered through a race:
396 * something inserts a STA (on one CPU) without holding the RTNL
397 * and another CPU turns off the net device.
399 if (unlikely(!ieee80211_sdata_running(sdata
)))
402 if (WARN_ON(ether_addr_equal(sta
->sta
.addr
, sdata
->vif
.addr
) ||
403 is_multicast_ether_addr(sta
->sta
.addr
)))
409 static int sta_info_insert_drv_state(struct ieee80211_local
*local
,
410 struct ieee80211_sub_if_data
*sdata
,
411 struct sta_info
*sta
)
413 enum ieee80211_sta_state state
;
416 for (state
= IEEE80211_STA_NOTEXIST
; state
< sta
->sta_state
; state
++) {
417 err
= drv_sta_state(local
, sdata
, sta
, state
, state
+ 1);
424 * Drivers using legacy sta_add/sta_remove callbacks only
425 * get uploaded set to true after sta_add is called.
427 if (!local
->ops
->sta_add
)
428 sta
->uploaded
= true;
432 if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
434 "failed to move IBSS STA %pM to state %d (%d) - keeping it anyway\n",
435 sta
->sta
.addr
, state
+ 1, err
);
439 /* unwind on error */
440 for (; state
> IEEE80211_STA_NOTEXIST
; state
--)
441 WARN_ON(drv_sta_state(local
, sdata
, sta
, state
, state
- 1));
447 * should be called with sta_mtx locked
448 * this function replaces the mutex lock
451 static int sta_info_insert_finish(struct sta_info
*sta
) __acquires(RCU
)
453 struct ieee80211_local
*local
= sta
->local
;
454 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
455 struct station_info sinfo
;
458 lockdep_assert_held(&local
->sta_mtx
);
460 /* check if STA exists already */
461 if (sta_info_get_bss(sdata
, sta
->sta
.addr
)) {
467 err
= sta_info_insert_drv_state(local
, sdata
, sta
);
472 local
->sta_generation
++;
475 /* make the station visible */
476 sta_info_hash_add(local
, sta
);
478 list_add_rcu(&sta
->list
, &local
->sta_list
);
480 set_sta_flag(sta
, WLAN_STA_INSERTED
);
482 ieee80211_sta_debugfs_add(sta
);
483 rate_control_add_sta_debugfs(sta
);
485 memset(&sinfo
, 0, sizeof(sinfo
));
487 sinfo
.generation
= local
->sta_generation
;
488 cfg80211_new_sta(sdata
->dev
, sta
->sta
.addr
, &sinfo
, GFP_KERNEL
);
490 sta_dbg(sdata
, "Inserted STA %pM\n", sta
->sta
.addr
);
492 /* move reference to rcu-protected */
494 mutex_unlock(&local
->sta_mtx
);
496 if (ieee80211_vif_is_mesh(&sdata
->vif
))
497 mesh_accept_plinks_update(sdata
);
501 mutex_unlock(&local
->sta_mtx
);
506 int sta_info_insert_rcu(struct sta_info
*sta
) __acquires(RCU
)
508 struct ieee80211_local
*local
= sta
->local
;
513 err
= sta_info_insert_check(sta
);
519 mutex_lock(&local
->sta_mtx
);
521 err
= sta_info_insert_finish(sta
);
528 sta_info_free(local
, sta
);
532 int sta_info_insert(struct sta_info
*sta
)
534 int err
= sta_info_insert_rcu(sta
);
541 static inline void __bss_tim_set(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 __set_bit() format.
547 tim
[id
/ 8] |= (1 << (id
% 8));
550 static inline void __bss_tim_clear(u8
*tim
, u16 id
)
553 * This format has been mandated by the IEEE specifications,
554 * so this line may not be changed to use the __clear_bit() format.
556 tim
[id
/ 8] &= ~(1 << (id
% 8));
559 static inline bool __bss_tim_get(u8
*tim
, u16 id
)
562 * This format has been mandated by the IEEE specifications,
563 * so this line may not be changed to use the test_bit() format.
565 return tim
[id
/ 8] & (1 << (id
% 8));
568 static unsigned long ieee80211_tids_for_ac(int ac
)
570 /* If we ever support TIDs > 7, this obviously needs to be adjusted */
572 case IEEE80211_AC_VO
:
573 return BIT(6) | BIT(7);
574 case IEEE80211_AC_VI
:
575 return BIT(4) | BIT(5);
576 case IEEE80211_AC_BE
:
577 return BIT(0) | BIT(3);
578 case IEEE80211_AC_BK
:
579 return BIT(1) | BIT(2);
586 void sta_info_recalc_tim(struct sta_info
*sta
)
588 struct ieee80211_local
*local
= sta
->local
;
590 bool indicate_tim
= false;
591 u8 ignore_for_tim
= sta
->sta
.uapsd_queues
;
595 if (sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
596 sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) {
597 if (WARN_ON_ONCE(!sta
->sdata
->bss
))
600 ps
= &sta
->sdata
->bss
->ps
;
602 #ifdef CONFIG_MAC80211_MESH
603 } else if (ieee80211_vif_is_mesh(&sta
->sdata
->vif
)) {
604 ps
= &sta
->sdata
->u
.mesh
.ps
;
605 /* TIM map only for PLID <= IEEE80211_MAX_AID */
606 id
= le16_to_cpu(sta
->plid
) % IEEE80211_MAX_AID
;
612 /* No need to do anything if the driver does all */
613 if (local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
)
620 * If all ACs are delivery-enabled then we should build
621 * the TIM bit for all ACs anyway; if only some are then
622 * we ignore those and build the TIM bit using only the
625 if (ignore_for_tim
== BIT(IEEE80211_NUM_ACS
) - 1)
628 for (ac
= 0; ac
< IEEE80211_NUM_ACS
; ac
++) {
631 if (ignore_for_tim
& BIT(ac
))
634 indicate_tim
|= !skb_queue_empty(&sta
->tx_filtered
[ac
]) ||
635 !skb_queue_empty(&sta
->ps_tx_buf
[ac
]);
639 tids
= ieee80211_tids_for_ac(ac
);
642 sta
->driver_buffered_tids
& tids
;
646 spin_lock_bh(&local
->tim_lock
);
648 if (indicate_tim
== __bss_tim_get(ps
->tim
, id
))
652 __bss_tim_set(ps
->tim
, id
);
654 __bss_tim_clear(ps
->tim
, id
);
656 if (local
->ops
->set_tim
) {
657 local
->tim_in_locked_section
= true;
658 drv_set_tim(local
, &sta
->sta
, indicate_tim
);
659 local
->tim_in_locked_section
= false;
663 spin_unlock_bh(&local
->tim_lock
);
666 static bool sta_info_buffer_expired(struct sta_info
*sta
, struct sk_buff
*skb
)
668 struct ieee80211_tx_info
*info
;
674 info
= IEEE80211_SKB_CB(skb
);
676 /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
677 timeout
= (sta
->listen_interval
*
678 sta
->sdata
->vif
.bss_conf
.beacon_int
*
680 if (timeout
< STA_TX_BUFFER_EXPIRE
)
681 timeout
= STA_TX_BUFFER_EXPIRE
;
682 return time_after(jiffies
, info
->control
.jiffies
+ timeout
);
686 static bool sta_info_cleanup_expire_buffered_ac(struct ieee80211_local
*local
,
687 struct sta_info
*sta
, int ac
)
693 * First check for frames that should expire on the filtered
694 * queue. Frames here were rejected by the driver and are on
695 * a separate queue to avoid reordering with normal PS-buffered
696 * frames. They also aren't accounted for right now in the
697 * total_ps_buffered counter.
700 spin_lock_irqsave(&sta
->tx_filtered
[ac
].lock
, flags
);
701 skb
= skb_peek(&sta
->tx_filtered
[ac
]);
702 if (sta_info_buffer_expired(sta
, skb
))
703 skb
= __skb_dequeue(&sta
->tx_filtered
[ac
]);
706 spin_unlock_irqrestore(&sta
->tx_filtered
[ac
].lock
, flags
);
709 * Frames are queued in order, so if this one
710 * hasn't expired yet we can stop testing. If
711 * we actually reached the end of the queue we
712 * also need to stop, of course.
716 ieee80211_free_txskb(&local
->hw
, skb
);
720 * Now also check the normal PS-buffered queue, this will
721 * only find something if the filtered queue was emptied
722 * since the filtered frames are all before the normal PS
726 spin_lock_irqsave(&sta
->ps_tx_buf
[ac
].lock
, flags
);
727 skb
= skb_peek(&sta
->ps_tx_buf
[ac
]);
728 if (sta_info_buffer_expired(sta
, skb
))
729 skb
= __skb_dequeue(&sta
->ps_tx_buf
[ac
]);
732 spin_unlock_irqrestore(&sta
->ps_tx_buf
[ac
].lock
, flags
);
735 * frames are queued in order, so if this one
736 * hasn't expired yet (or we reached the end of
737 * the queue) we can stop testing
742 local
->total_ps_buffered
--;
743 ps_dbg(sta
->sdata
, "Buffered frame expired (STA %pM)\n",
745 ieee80211_free_txskb(&local
->hw
, skb
);
749 * Finally, recalculate the TIM bit for this station -- it might
750 * now be clear because the station was too slow to retrieve its
753 sta_info_recalc_tim(sta
);
756 * Return whether there are any frames still buffered, this is
757 * used to check whether the cleanup timer still needs to run,
758 * if there are no frames we don't need to rearm the timer.
760 return !(skb_queue_empty(&sta
->ps_tx_buf
[ac
]) &&
761 skb_queue_empty(&sta
->tx_filtered
[ac
]));
764 static bool sta_info_cleanup_expire_buffered(struct ieee80211_local
*local
,
765 struct sta_info
*sta
)
767 bool have_buffered
= false;
770 /* This is only necessary for stations on BSS/MBSS interfaces */
771 if (!sta
->sdata
->bss
&&
772 !ieee80211_vif_is_mesh(&sta
->sdata
->vif
))
775 for (ac
= 0; ac
< IEEE80211_NUM_ACS
; ac
++)
777 sta_info_cleanup_expire_buffered_ac(local
, sta
, ac
);
779 return have_buffered
;
782 int __must_check
__sta_info_destroy(struct sta_info
*sta
)
784 struct ieee80211_local
*local
;
785 struct ieee80211_sub_if_data
*sdata
;
796 lockdep_assert_held(&local
->sta_mtx
);
799 * Before removing the station from the driver and
800 * rate control, it might still start new aggregation
801 * sessions -- block that to make sure the tear-down
802 * will be sufficient.
804 set_sta_flag(sta
, WLAN_STA_BLOCK_BA
);
805 ieee80211_sta_tear_down_BA_sessions(sta
, AGG_STOP_DESTROY_STA
);
807 ret
= sta_info_hash_del(local
, sta
);
811 list_del_rcu(&sta
->list
);
813 /* this always calls synchronize_net() */
814 ieee80211_free_sta_keys(local
, sta
);
819 local
->sta_generation
++;
821 if (sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
822 RCU_INIT_POINTER(sdata
->u
.vlan
.sta
, NULL
);
824 while (sta
->sta_state
> IEEE80211_STA_NONE
) {
825 ret
= sta_info_move_state(sta
, sta
->sta_state
- 1);
833 ret
= drv_sta_state(local
, sdata
, sta
, IEEE80211_STA_NONE
,
834 IEEE80211_STA_NOTEXIST
);
835 WARN_ON_ONCE(ret
!= 0);
838 sta_dbg(sdata
, "Removed STA %pM\n", sta
->sta
.addr
);
840 cfg80211_del_sta(sdata
->dev
, sta
->sta
.addr
, GFP_KERNEL
);
842 rate_control_remove_sta_debugfs(sta
);
843 ieee80211_sta_debugfs_remove(sta
);
845 call_rcu(&sta
->rcu_head
, free_sta_rcu
);
850 int sta_info_destroy_addr(struct ieee80211_sub_if_data
*sdata
, const u8
*addr
)
852 struct sta_info
*sta
;
855 mutex_lock(&sdata
->local
->sta_mtx
);
856 sta
= sta_info_get(sdata
, addr
);
857 ret
= __sta_info_destroy(sta
);
858 mutex_unlock(&sdata
->local
->sta_mtx
);
863 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data
*sdata
,
866 struct sta_info
*sta
;
869 mutex_lock(&sdata
->local
->sta_mtx
);
870 sta
= sta_info_get_bss(sdata
, addr
);
871 ret
= __sta_info_destroy(sta
);
872 mutex_unlock(&sdata
->local
->sta_mtx
);
877 static void sta_info_cleanup(unsigned long data
)
879 struct ieee80211_local
*local
= (struct ieee80211_local
*) data
;
880 struct sta_info
*sta
;
881 bool timer_needed
= false;
884 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
)
885 if (sta_info_cleanup_expire_buffered(local
, sta
))
889 if (local
->quiescing
)
895 mod_timer(&local
->sta_cleanup
,
896 round_jiffies(jiffies
+ STA_INFO_CLEANUP_INTERVAL
));
899 void sta_info_init(struct ieee80211_local
*local
)
901 spin_lock_init(&local
->tim_lock
);
902 mutex_init(&local
->sta_mtx
);
903 INIT_LIST_HEAD(&local
->sta_list
);
905 setup_timer(&local
->sta_cleanup
, sta_info_cleanup
,
906 (unsigned long)local
);
909 void sta_info_stop(struct ieee80211_local
*local
)
911 del_timer_sync(&local
->sta_cleanup
);
915 int sta_info_flush_defer(struct ieee80211_sub_if_data
*sdata
)
917 struct ieee80211_local
*local
= sdata
->local
;
918 struct sta_info
*sta
, *tmp
;
923 mutex_lock(&local
->sta_mtx
);
924 list_for_each_entry_safe(sta
, tmp
, &local
->sta_list
, list
) {
925 if (sdata
== sta
->sdata
) {
926 WARN_ON(__sta_info_destroy(sta
));
930 mutex_unlock(&local
->sta_mtx
);
935 void sta_info_flush_cleanup(struct ieee80211_sub_if_data
*sdata
)
937 ieee80211_cleanup_sdata_stas(sdata
);
938 cancel_work_sync(&sdata
->cleanup_stations_wk
);
941 void ieee80211_sta_expire(struct ieee80211_sub_if_data
*sdata
,
942 unsigned long exp_time
)
944 struct ieee80211_local
*local
= sdata
->local
;
945 struct sta_info
*sta
, *tmp
;
947 mutex_lock(&local
->sta_mtx
);
949 list_for_each_entry_safe(sta
, tmp
, &local
->sta_list
, list
) {
950 if (sdata
!= sta
->sdata
)
953 if (time_after(jiffies
, sta
->last_rx
+ exp_time
)) {
954 sta_dbg(sta
->sdata
, "expiring inactive STA %pM\n",
957 if (ieee80211_vif_is_mesh(&sdata
->vif
) &&
958 test_sta_flag(sta
, WLAN_STA_PS_STA
))
959 atomic_dec(&sdata
->u
.mesh
.ps
.num_sta_ps
);
961 WARN_ON(__sta_info_destroy(sta
));
965 mutex_unlock(&local
->sta_mtx
);
968 struct ieee80211_sta
*ieee80211_find_sta_by_ifaddr(struct ieee80211_hw
*hw
,
972 struct sta_info
*sta
, *nxt
;
975 * Just return a random station if localaddr is NULL
978 for_each_sta_info(hw_to_local(hw
), addr
, sta
, nxt
) {
980 !ether_addr_equal(sta
->sdata
->vif
.addr
, localaddr
))
989 EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr
);
991 struct ieee80211_sta
*ieee80211_find_sta(struct ieee80211_vif
*vif
,
994 struct sta_info
*sta
;
999 sta
= sta_info_get_bss(vif_to_sdata(vif
), addr
);
1008 EXPORT_SYMBOL(ieee80211_find_sta
);
1010 static void clear_sta_ps_flags(void *_sta
)
1012 struct sta_info
*sta
= _sta
;
1013 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
1016 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1017 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
1018 ps
= &sdata
->bss
->ps
;
1019 else if (ieee80211_vif_is_mesh(&sdata
->vif
))
1020 ps
= &sdata
->u
.mesh
.ps
;
1024 clear_sta_flag(sta
, WLAN_STA_PS_DRIVER
);
1025 if (test_and_clear_sta_flag(sta
, WLAN_STA_PS_STA
))
1026 atomic_dec(&ps
->num_sta_ps
);
1029 /* powersave support code */
1030 void ieee80211_sta_ps_deliver_wakeup(struct sta_info
*sta
)
1032 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
1033 struct ieee80211_local
*local
= sdata
->local
;
1034 struct sk_buff_head pending
;
1035 int filtered
= 0, buffered
= 0, ac
;
1036 unsigned long flags
;
1038 clear_sta_flag(sta
, WLAN_STA_SP
);
1040 BUILD_BUG_ON(BITS_TO_LONGS(IEEE80211_NUM_TIDS
) > 1);
1041 sta
->driver_buffered_tids
= 0;
1043 if (!(local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
))
1044 drv_sta_notify(local
, sdata
, STA_NOTIFY_AWAKE
, &sta
->sta
);
1046 skb_queue_head_init(&pending
);
1048 /* Send all buffered frames to the station */
1049 for (ac
= 0; ac
< IEEE80211_NUM_ACS
; ac
++) {
1050 int count
= skb_queue_len(&pending
), tmp
;
1052 spin_lock_irqsave(&sta
->tx_filtered
[ac
].lock
, flags
);
1053 skb_queue_splice_tail_init(&sta
->tx_filtered
[ac
], &pending
);
1054 spin_unlock_irqrestore(&sta
->tx_filtered
[ac
].lock
, flags
);
1055 tmp
= skb_queue_len(&pending
);
1056 filtered
+= tmp
- count
;
1059 spin_lock_irqsave(&sta
->ps_tx_buf
[ac
].lock
, flags
);
1060 skb_queue_splice_tail_init(&sta
->ps_tx_buf
[ac
], &pending
);
1061 spin_unlock_irqrestore(&sta
->ps_tx_buf
[ac
].lock
, flags
);
1062 tmp
= skb_queue_len(&pending
);
1063 buffered
+= tmp
- count
;
1066 ieee80211_add_pending_skbs_fn(local
, &pending
, clear_sta_ps_flags
, sta
);
1068 local
->total_ps_buffered
-= buffered
;
1070 sta_info_recalc_tim(sta
);
1073 "STA %pM aid %d sending %d filtered/%d PS frames since STA not sleeping anymore\n",
1074 sta
->sta
.addr
, sta
->sta
.aid
, filtered
, buffered
);
1077 static void ieee80211_send_null_response(struct ieee80211_sub_if_data
*sdata
,
1078 struct sta_info
*sta
, int tid
,
1079 enum ieee80211_frame_release_type reason
)
1081 struct ieee80211_local
*local
= sdata
->local
;
1082 struct ieee80211_qos_hdr
*nullfunc
;
1083 struct sk_buff
*skb
;
1084 int size
= sizeof(*nullfunc
);
1086 bool qos
= test_sta_flag(sta
, WLAN_STA_WME
);
1087 struct ieee80211_tx_info
*info
;
1088 struct ieee80211_chanctx_conf
*chanctx_conf
;
1091 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
|
1092 IEEE80211_STYPE_QOS_NULLFUNC
|
1093 IEEE80211_FCTL_FROMDS
);
1096 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
|
1097 IEEE80211_STYPE_NULLFUNC
|
1098 IEEE80211_FCTL_FROMDS
);
1101 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ size
);
1105 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
1107 nullfunc
= (void *) skb_put(skb
, size
);
1108 nullfunc
->frame_control
= fc
;
1109 nullfunc
->duration_id
= 0;
1110 memcpy(nullfunc
->addr1
, sta
->sta
.addr
, ETH_ALEN
);
1111 memcpy(nullfunc
->addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1112 memcpy(nullfunc
->addr3
, sdata
->vif
.addr
, ETH_ALEN
);
1114 skb
->priority
= tid
;
1115 skb_set_queue_mapping(skb
, ieee802_1d_to_ac
[tid
]);
1117 nullfunc
->qos_ctrl
= cpu_to_le16(tid
);
1119 if (reason
== IEEE80211_FRAME_RELEASE_UAPSD
)
1120 nullfunc
->qos_ctrl
|=
1121 cpu_to_le16(IEEE80211_QOS_CTL_EOSP
);
1124 info
= IEEE80211_SKB_CB(skb
);
1127 * Tell TX path to send this frame even though the
1128 * STA may still remain is PS mode after this frame
1129 * exchange. Also set EOSP to indicate this packet
1130 * ends the poll/service period.
1132 info
->flags
|= IEEE80211_TX_CTL_NO_PS_BUFFER
|
1133 IEEE80211_TX_STATUS_EOSP
|
1134 IEEE80211_TX_CTL_REQ_TX_STATUS
;
1136 drv_allow_buffered_frames(local
, sta
, BIT(tid
), 1, reason
, false);
1138 skb
->dev
= sdata
->dev
;
1141 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
1142 if (WARN_ON(!chanctx_conf
)) {
1148 ieee80211_xmit(sdata
, skb
, chanctx_conf
->def
.chan
->band
);
1153 ieee80211_sta_ps_deliver_response(struct sta_info
*sta
,
1154 int n_frames
, u8 ignored_acs
,
1155 enum ieee80211_frame_release_type reason
)
1157 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
1158 struct ieee80211_local
*local
= sdata
->local
;
1160 bool more_data
= false;
1162 unsigned long driver_release_tids
= 0;
1163 struct sk_buff_head frames
;
1165 /* Service or PS-Poll period starts */
1166 set_sta_flag(sta
, WLAN_STA_SP
);
1168 __skb_queue_head_init(&frames
);
1171 * Get response frame(s) and more data bit for it.
1173 for (ac
= 0; ac
< IEEE80211_NUM_ACS
; ac
++) {
1176 if (ignored_acs
& BIT(ac
))
1179 tids
= ieee80211_tids_for_ac(ac
);
1182 driver_release_tids
= sta
->driver_buffered_tids
& tids
;
1183 if (driver_release_tids
) {
1186 struct sk_buff
*skb
;
1188 while (n_frames
> 0) {
1189 skb
= skb_dequeue(&sta
->tx_filtered
[ac
]);
1192 &sta
->ps_tx_buf
[ac
]);
1194 local
->total_ps_buffered
--;
1200 __skb_queue_tail(&frames
, skb
);
1205 * If the driver has data on more than one TID then
1206 * certainly there's more data if we release just a
1207 * single frame now (from a single TID).
1209 if (reason
== IEEE80211_FRAME_RELEASE_PSPOLL
&&
1210 hweight16(driver_release_tids
) > 1) {
1212 driver_release_tids
=
1213 BIT(ffs(driver_release_tids
) - 1);
1218 if (!skb_queue_empty(&sta
->tx_filtered
[ac
]) ||
1219 !skb_queue_empty(&sta
->ps_tx_buf
[ac
])) {
1229 * For PS-Poll, this can only happen due to a race condition
1230 * when we set the TIM bit and the station notices it, but
1231 * before it can poll for the frame we expire it.
1233 * For uAPSD, this is said in the standard (11.2.1.5 h):
1234 * At each unscheduled SP for a non-AP STA, the AP shall
1235 * attempt to transmit at least one MSDU or MMPDU, but no
1236 * more than the value specified in the Max SP Length field
1237 * in the QoS Capability element from delivery-enabled ACs,
1238 * that are destined for the non-AP STA.
1240 * Since we have no other MSDU/MMPDU, transmit a QoS null frame.
1243 /* This will evaluate to 1, 3, 5 or 7. */
1244 tid
= 7 - ((ffs(~ignored_acs
) - 1) << 1);
1246 ieee80211_send_null_response(sdata
, sta
, tid
, reason
);
1250 if (!driver_release_tids
) {
1251 struct sk_buff_head pending
;
1252 struct sk_buff
*skb
;
1256 skb_queue_head_init(&pending
);
1258 while ((skb
= __skb_dequeue(&frames
))) {
1259 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1260 struct ieee80211_hdr
*hdr
= (void *) skb
->data
;
1266 * Tell TX path to send this frame even though the
1267 * STA may still remain is PS mode after this frame
1270 info
->flags
|= IEEE80211_TX_CTL_NO_PS_BUFFER
;
1273 * Use MoreData flag to indicate whether there are
1274 * more buffered frames for this STA
1276 if (more_data
|| !skb_queue_empty(&frames
))
1277 hdr
->frame_control
|=
1278 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
1280 hdr
->frame_control
&=
1281 cpu_to_le16(~IEEE80211_FCTL_MOREDATA
);
1283 if (ieee80211_is_data_qos(hdr
->frame_control
) ||
1284 ieee80211_is_qos_nullfunc(hdr
->frame_control
))
1285 qoshdr
= ieee80211_get_qos_ctl(hdr
);
1287 /* end service period after last frame */
1288 if (skb_queue_empty(&frames
)) {
1289 if (reason
== IEEE80211_FRAME_RELEASE_UAPSD
&&
1291 *qoshdr
|= IEEE80211_QOS_CTL_EOSP
;
1293 info
->flags
|= IEEE80211_TX_STATUS_EOSP
|
1294 IEEE80211_TX_CTL_REQ_TX_STATUS
;
1298 tids
|= BIT(*qoshdr
& IEEE80211_QOS_CTL_TID_MASK
);
1302 __skb_queue_tail(&pending
, skb
);
1305 drv_allow_buffered_frames(local
, sta
, tids
, num
,
1308 ieee80211_add_pending_skbs(local
, &pending
);
1310 sta_info_recalc_tim(sta
);
1313 * We need to release a frame that is buffered somewhere in the
1314 * driver ... it'll have to handle that.
1315 * Note that, as per the comment above, it'll also have to see
1316 * if there is more than just one frame on the specific TID that
1317 * we're releasing from, and it needs to set the more-data bit
1318 * accordingly if we tell it that there's no more data. If we do
1319 * tell it there's more data, then of course the more-data bit
1320 * needs to be set anyway.
1322 drv_release_buffered_frames(local
, sta
, driver_release_tids
,
1323 n_frames
, reason
, more_data
);
1326 * Note that we don't recalculate the TIM bit here as it would
1327 * most likely have no effect at all unless the driver told us
1328 * that the TID became empty before returning here from the
1330 * Either way, however, when the driver tells us that the TID
1331 * became empty we'll do the TIM recalculation.
1336 void ieee80211_sta_ps_deliver_poll_response(struct sta_info
*sta
)
1338 u8 ignore_for_response
= sta
->sta
.uapsd_queues
;
1341 * If all ACs are delivery-enabled then we should reply
1342 * from any of them, if only some are enabled we reply
1343 * only from the non-enabled ones.
1345 if (ignore_for_response
== BIT(IEEE80211_NUM_ACS
) - 1)
1346 ignore_for_response
= 0;
1348 ieee80211_sta_ps_deliver_response(sta
, 1, ignore_for_response
,
1349 IEEE80211_FRAME_RELEASE_PSPOLL
);
1352 void ieee80211_sta_ps_deliver_uapsd(struct sta_info
*sta
)
1354 int n_frames
= sta
->sta
.max_sp
;
1355 u8 delivery_enabled
= sta
->sta
.uapsd_queues
;
1358 * If we ever grow support for TSPEC this might happen if
1359 * the TSPEC update from hostapd comes in between a trigger
1360 * frame setting WLAN_STA_UAPSD in the RX path and this
1361 * actually getting called.
1363 if (!delivery_enabled
)
1366 switch (sta
->sta
.max_sp
) {
1377 /* XXX: what is a good value? */
1382 ieee80211_sta_ps_deliver_response(sta
, n_frames
, ~delivery_enabled
,
1383 IEEE80211_FRAME_RELEASE_UAPSD
);
1386 void ieee80211_sta_block_awake(struct ieee80211_hw
*hw
,
1387 struct ieee80211_sta
*pubsta
, bool block
)
1389 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
1391 trace_api_sta_block_awake(sta
->local
, pubsta
, block
);
1394 set_sta_flag(sta
, WLAN_STA_PS_DRIVER
);
1395 else if (test_sta_flag(sta
, WLAN_STA_PS_DRIVER
))
1396 ieee80211_queue_work(hw
, &sta
->drv_unblock_wk
);
1398 EXPORT_SYMBOL(ieee80211_sta_block_awake
);
1400 void ieee80211_sta_eosp(struct ieee80211_sta
*pubsta
)
1402 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
1403 struct ieee80211_local
*local
= sta
->local
;
1405 trace_api_eosp(local
, pubsta
);
1407 clear_sta_flag(sta
, WLAN_STA_SP
);
1409 EXPORT_SYMBOL(ieee80211_sta_eosp
);
1411 void ieee80211_sta_set_buffered(struct ieee80211_sta
*pubsta
,
1412 u8 tid
, bool buffered
)
1414 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
1416 if (WARN_ON(tid
>= IEEE80211_NUM_TIDS
))
1420 set_bit(tid
, &sta
->driver_buffered_tids
);
1422 clear_bit(tid
, &sta
->driver_buffered_tids
);
1424 sta_info_recalc_tim(sta
);
1426 EXPORT_SYMBOL(ieee80211_sta_set_buffered
);
1428 int sta_info_move_state(struct sta_info
*sta
,
1429 enum ieee80211_sta_state new_state
)
1433 if (sta
->sta_state
== new_state
)
1436 /* check allowed transitions first */
1438 switch (new_state
) {
1439 case IEEE80211_STA_NONE
:
1440 if (sta
->sta_state
!= IEEE80211_STA_AUTH
)
1443 case IEEE80211_STA_AUTH
:
1444 if (sta
->sta_state
!= IEEE80211_STA_NONE
&&
1445 sta
->sta_state
!= IEEE80211_STA_ASSOC
)
1448 case IEEE80211_STA_ASSOC
:
1449 if (sta
->sta_state
!= IEEE80211_STA_AUTH
&&
1450 sta
->sta_state
!= IEEE80211_STA_AUTHORIZED
)
1453 case IEEE80211_STA_AUTHORIZED
:
1454 if (sta
->sta_state
!= IEEE80211_STA_ASSOC
)
1458 WARN(1, "invalid state %d", new_state
);
1462 sta_dbg(sta
->sdata
, "moving STA %pM to state %d\n",
1463 sta
->sta
.addr
, new_state
);
1466 * notify the driver before the actual changes so it can
1467 * fail the transition
1469 if (test_sta_flag(sta
, WLAN_STA_INSERTED
)) {
1470 int err
= drv_sta_state(sta
->local
, sta
->sdata
, sta
,
1471 sta
->sta_state
, new_state
);
1476 /* reflect the change in all state variables */
1478 switch (new_state
) {
1479 case IEEE80211_STA_NONE
:
1480 if (sta
->sta_state
== IEEE80211_STA_AUTH
)
1481 clear_bit(WLAN_STA_AUTH
, &sta
->_flags
);
1483 case IEEE80211_STA_AUTH
:
1484 if (sta
->sta_state
== IEEE80211_STA_NONE
)
1485 set_bit(WLAN_STA_AUTH
, &sta
->_flags
);
1486 else if (sta
->sta_state
== IEEE80211_STA_ASSOC
)
1487 clear_bit(WLAN_STA_ASSOC
, &sta
->_flags
);
1489 case IEEE80211_STA_ASSOC
:
1490 if (sta
->sta_state
== IEEE80211_STA_AUTH
) {
1491 set_bit(WLAN_STA_ASSOC
, &sta
->_flags
);
1492 } else if (sta
->sta_state
== IEEE80211_STA_AUTHORIZED
) {
1493 if (sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1494 (sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1495 !sta
->sdata
->u
.vlan
.sta
))
1496 atomic_dec(&sta
->sdata
->bss
->num_mcast_sta
);
1497 clear_bit(WLAN_STA_AUTHORIZED
, &sta
->_flags
);
1500 case IEEE80211_STA_AUTHORIZED
:
1501 if (sta
->sta_state
== IEEE80211_STA_ASSOC
) {
1502 if (sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1503 (sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1504 !sta
->sdata
->u
.vlan
.sta
))
1505 atomic_inc(&sta
->sdata
->bss
->num_mcast_sta
);
1506 set_bit(WLAN_STA_AUTHORIZED
, &sta
->_flags
);
1513 sta
->sta_state
= new_state
;