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 spin_lock_init(&sta
->ps_lock
);
343 INIT_WORK(&sta
->drv_unblock_wk
, sta_unblock
);
344 INIT_WORK(&sta
->ampdu_mlme
.work
, ieee80211_ba_session_work
);
345 mutex_init(&sta
->ampdu_mlme
.mtx
);
346 #ifdef CONFIG_MAC80211_MESH
347 if (ieee80211_vif_is_mesh(&sdata
->vif
) &&
348 !sdata
->u
.mesh
.user_mpm
)
349 init_timer(&sta
->plink_timer
);
352 memcpy(sta
->sta
.addr
, addr
, ETH_ALEN
);
355 sta
->last_rx
= jiffies
;
357 sta
->sta_state
= IEEE80211_STA_NONE
;
359 do_posix_clock_monotonic_gettime(&uptime
);
360 sta
->last_connected
= uptime
.tv_sec
;
361 ewma_init(&sta
->avg_signal
, 1024, 8);
363 if (sta_prepare_rate_control(local
, sta
, gfp
)) {
368 for (i
= 0; i
< IEEE80211_NUM_TIDS
; i
++) {
370 * timer_to_tid must be initialized with identity mapping
371 * to enable session_timer's data differentiation. See
372 * sta_rx_agg_session_timer_expired for usage.
374 sta
->timer_to_tid
[i
] = i
;
376 for (i
= 0; i
< IEEE80211_NUM_ACS
; i
++) {
377 skb_queue_head_init(&sta
->ps_tx_buf
[i
]);
378 skb_queue_head_init(&sta
->tx_filtered
[i
]);
381 for (i
= 0; i
< IEEE80211_NUM_TIDS
; i
++)
382 sta
->last_seq_ctrl
[i
] = cpu_to_le16(USHRT_MAX
);
384 sta
->sta
.smps_mode
= IEEE80211_SMPS_OFF
;
386 sta_dbg(sdata
, "Allocated STA %pM\n", sta
->sta
.addr
);
391 static int sta_info_insert_check(struct sta_info
*sta
)
393 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
396 * Can't be a WARN_ON because it can be triggered through a race:
397 * something inserts a STA (on one CPU) without holding the RTNL
398 * and another CPU turns off the net device.
400 if (unlikely(!ieee80211_sdata_running(sdata
)))
403 if (WARN_ON(ether_addr_equal(sta
->sta
.addr
, sdata
->vif
.addr
) ||
404 is_multicast_ether_addr(sta
->sta
.addr
)))
410 static int sta_info_insert_drv_state(struct ieee80211_local
*local
,
411 struct ieee80211_sub_if_data
*sdata
,
412 struct sta_info
*sta
)
414 enum ieee80211_sta_state state
;
417 for (state
= IEEE80211_STA_NOTEXIST
; state
< sta
->sta_state
; state
++) {
418 err
= drv_sta_state(local
, sdata
, sta
, state
, state
+ 1);
425 * Drivers using legacy sta_add/sta_remove callbacks only
426 * get uploaded set to true after sta_add is called.
428 if (!local
->ops
->sta_add
)
429 sta
->uploaded
= true;
433 if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
435 "failed to move IBSS STA %pM to state %d (%d) - keeping it anyway\n",
436 sta
->sta
.addr
, state
+ 1, err
);
440 /* unwind on error */
441 for (; state
> IEEE80211_STA_NOTEXIST
; state
--)
442 WARN_ON(drv_sta_state(local
, sdata
, sta
, state
, state
- 1));
448 * should be called with sta_mtx locked
449 * this function replaces the mutex lock
452 static int sta_info_insert_finish(struct sta_info
*sta
) __acquires(RCU
)
454 struct ieee80211_local
*local
= sta
->local
;
455 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
456 struct station_info sinfo
;
459 lockdep_assert_held(&local
->sta_mtx
);
461 /* check if STA exists already */
462 if (sta_info_get_bss(sdata
, sta
->sta
.addr
)) {
468 err
= sta_info_insert_drv_state(local
, sdata
, sta
);
473 local
->sta_generation
++;
476 /* make the station visible */
477 sta_info_hash_add(local
, sta
);
479 list_add_rcu(&sta
->list
, &local
->sta_list
);
481 set_sta_flag(sta
, WLAN_STA_INSERTED
);
483 ieee80211_sta_debugfs_add(sta
);
484 rate_control_add_sta_debugfs(sta
);
486 memset(&sinfo
, 0, sizeof(sinfo
));
488 sinfo
.generation
= local
->sta_generation
;
489 cfg80211_new_sta(sdata
->dev
, sta
->sta
.addr
, &sinfo
, GFP_KERNEL
);
491 sta_dbg(sdata
, "Inserted STA %pM\n", sta
->sta
.addr
);
493 /* move reference to rcu-protected */
495 mutex_unlock(&local
->sta_mtx
);
497 if (ieee80211_vif_is_mesh(&sdata
->vif
))
498 mesh_accept_plinks_update(sdata
);
502 mutex_unlock(&local
->sta_mtx
);
507 int sta_info_insert_rcu(struct sta_info
*sta
) __acquires(RCU
)
509 struct ieee80211_local
*local
= sta
->local
;
514 err
= sta_info_insert_check(sta
);
520 mutex_lock(&local
->sta_mtx
);
522 err
= sta_info_insert_finish(sta
);
529 sta_info_free(local
, sta
);
533 int sta_info_insert(struct sta_info
*sta
)
535 int err
= sta_info_insert_rcu(sta
);
542 static inline void __bss_tim_set(u8
*tim
, u16 id
)
545 * This format has been mandated by the IEEE specifications,
546 * so this line may not be changed to use the __set_bit() format.
548 tim
[id
/ 8] |= (1 << (id
% 8));
551 static inline void __bss_tim_clear(u8
*tim
, u16 id
)
554 * This format has been mandated by the IEEE specifications,
555 * so this line may not be changed to use the __clear_bit() format.
557 tim
[id
/ 8] &= ~(1 << (id
% 8));
560 static inline bool __bss_tim_get(u8
*tim
, u16 id
)
563 * This format has been mandated by the IEEE specifications,
564 * so this line may not be changed to use the test_bit() format.
566 return tim
[id
/ 8] & (1 << (id
% 8));
569 static unsigned long ieee80211_tids_for_ac(int ac
)
571 /* If we ever support TIDs > 7, this obviously needs to be adjusted */
573 case IEEE80211_AC_VO
:
574 return BIT(6) | BIT(7);
575 case IEEE80211_AC_VI
:
576 return BIT(4) | BIT(5);
577 case IEEE80211_AC_BE
:
578 return BIT(0) | BIT(3);
579 case IEEE80211_AC_BK
:
580 return BIT(1) | BIT(2);
587 void sta_info_recalc_tim(struct sta_info
*sta
)
589 struct ieee80211_local
*local
= sta
->local
;
591 bool indicate_tim
= false;
592 u8 ignore_for_tim
= sta
->sta
.uapsd_queues
;
596 if (sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
597 sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) {
598 if (WARN_ON_ONCE(!sta
->sdata
->bss
))
601 ps
= &sta
->sdata
->bss
->ps
;
603 #ifdef CONFIG_MAC80211_MESH
604 } else if (ieee80211_vif_is_mesh(&sta
->sdata
->vif
)) {
605 ps
= &sta
->sdata
->u
.mesh
.ps
;
606 /* TIM map only for PLID <= IEEE80211_MAX_AID */
607 id
= le16_to_cpu(sta
->plid
) % IEEE80211_MAX_AID
;
613 /* No need to do anything if the driver does all */
614 if (local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
)
621 * If all ACs are delivery-enabled then we should build
622 * the TIM bit for all ACs anyway; if only some are then
623 * we ignore those and build the TIM bit using only the
626 if (ignore_for_tim
== BIT(IEEE80211_NUM_ACS
) - 1)
629 for (ac
= 0; ac
< IEEE80211_NUM_ACS
; ac
++) {
632 if (ignore_for_tim
& BIT(ac
))
635 indicate_tim
|= !skb_queue_empty(&sta
->tx_filtered
[ac
]) ||
636 !skb_queue_empty(&sta
->ps_tx_buf
[ac
]);
640 tids
= ieee80211_tids_for_ac(ac
);
643 sta
->driver_buffered_tids
& tids
;
647 spin_lock_bh(&local
->tim_lock
);
649 if (indicate_tim
== __bss_tim_get(ps
->tim
, id
))
653 __bss_tim_set(ps
->tim
, id
);
655 __bss_tim_clear(ps
->tim
, id
);
657 if (local
->ops
->set_tim
) {
658 local
->tim_in_locked_section
= true;
659 drv_set_tim(local
, &sta
->sta
, indicate_tim
);
660 local
->tim_in_locked_section
= false;
664 spin_unlock_bh(&local
->tim_lock
);
667 static bool sta_info_buffer_expired(struct sta_info
*sta
, struct sk_buff
*skb
)
669 struct ieee80211_tx_info
*info
;
675 info
= IEEE80211_SKB_CB(skb
);
677 /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
678 timeout
= (sta
->listen_interval
*
679 sta
->sdata
->vif
.bss_conf
.beacon_int
*
681 if (timeout
< STA_TX_BUFFER_EXPIRE
)
682 timeout
= STA_TX_BUFFER_EXPIRE
;
683 return time_after(jiffies
, info
->control
.jiffies
+ timeout
);
687 static bool sta_info_cleanup_expire_buffered_ac(struct ieee80211_local
*local
,
688 struct sta_info
*sta
, int ac
)
694 * First check for frames that should expire on the filtered
695 * queue. Frames here were rejected by the driver and are on
696 * a separate queue to avoid reordering with normal PS-buffered
697 * frames. They also aren't accounted for right now in the
698 * total_ps_buffered counter.
701 spin_lock_irqsave(&sta
->tx_filtered
[ac
].lock
, flags
);
702 skb
= skb_peek(&sta
->tx_filtered
[ac
]);
703 if (sta_info_buffer_expired(sta
, skb
))
704 skb
= __skb_dequeue(&sta
->tx_filtered
[ac
]);
707 spin_unlock_irqrestore(&sta
->tx_filtered
[ac
].lock
, flags
);
710 * Frames are queued in order, so if this one
711 * hasn't expired yet we can stop testing. If
712 * we actually reached the end of the queue we
713 * also need to stop, of course.
717 ieee80211_free_txskb(&local
->hw
, skb
);
721 * Now also check the normal PS-buffered queue, this will
722 * only find something if the filtered queue was emptied
723 * since the filtered frames are all before the normal PS
727 spin_lock_irqsave(&sta
->ps_tx_buf
[ac
].lock
, flags
);
728 skb
= skb_peek(&sta
->ps_tx_buf
[ac
]);
729 if (sta_info_buffer_expired(sta
, skb
))
730 skb
= __skb_dequeue(&sta
->ps_tx_buf
[ac
]);
733 spin_unlock_irqrestore(&sta
->ps_tx_buf
[ac
].lock
, flags
);
736 * frames are queued in order, so if this one
737 * hasn't expired yet (or we reached the end of
738 * the queue) we can stop testing
743 local
->total_ps_buffered
--;
744 ps_dbg(sta
->sdata
, "Buffered frame expired (STA %pM)\n",
746 ieee80211_free_txskb(&local
->hw
, skb
);
750 * Finally, recalculate the TIM bit for this station -- it might
751 * now be clear because the station was too slow to retrieve its
754 sta_info_recalc_tim(sta
);
757 * Return whether there are any frames still buffered, this is
758 * used to check whether the cleanup timer still needs to run,
759 * if there are no frames we don't need to rearm the timer.
761 return !(skb_queue_empty(&sta
->ps_tx_buf
[ac
]) &&
762 skb_queue_empty(&sta
->tx_filtered
[ac
]));
765 static bool sta_info_cleanup_expire_buffered(struct ieee80211_local
*local
,
766 struct sta_info
*sta
)
768 bool have_buffered
= false;
771 /* This is only necessary for stations on BSS/MBSS interfaces */
772 if (!sta
->sdata
->bss
&&
773 !ieee80211_vif_is_mesh(&sta
->sdata
->vif
))
776 for (ac
= 0; ac
< IEEE80211_NUM_ACS
; ac
++)
778 sta_info_cleanup_expire_buffered_ac(local
, sta
, ac
);
780 return have_buffered
;
783 int __must_check
__sta_info_destroy(struct sta_info
*sta
)
785 struct ieee80211_local
*local
;
786 struct ieee80211_sub_if_data
*sdata
;
797 lockdep_assert_held(&local
->sta_mtx
);
800 * Before removing the station from the driver and
801 * rate control, it might still start new aggregation
802 * sessions -- block that to make sure the tear-down
803 * will be sufficient.
805 set_sta_flag(sta
, WLAN_STA_BLOCK_BA
);
806 ieee80211_sta_tear_down_BA_sessions(sta
, AGG_STOP_DESTROY_STA
);
808 ret
= sta_info_hash_del(local
, sta
);
812 list_del_rcu(&sta
->list
);
814 /* this always calls synchronize_net() */
815 ieee80211_free_sta_keys(local
, sta
);
820 local
->sta_generation
++;
822 if (sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
823 RCU_INIT_POINTER(sdata
->u
.vlan
.sta
, NULL
);
825 while (sta
->sta_state
> IEEE80211_STA_NONE
) {
826 ret
= sta_info_move_state(sta
, sta
->sta_state
- 1);
834 ret
= drv_sta_state(local
, sdata
, sta
, IEEE80211_STA_NONE
,
835 IEEE80211_STA_NOTEXIST
);
836 WARN_ON_ONCE(ret
!= 0);
839 sta_dbg(sdata
, "Removed STA %pM\n", sta
->sta
.addr
);
841 cfg80211_del_sta(sdata
->dev
, sta
->sta
.addr
, GFP_KERNEL
);
843 rate_control_remove_sta_debugfs(sta
);
844 ieee80211_sta_debugfs_remove(sta
);
846 call_rcu(&sta
->rcu_head
, free_sta_rcu
);
851 int sta_info_destroy_addr(struct ieee80211_sub_if_data
*sdata
, const u8
*addr
)
853 struct sta_info
*sta
;
856 mutex_lock(&sdata
->local
->sta_mtx
);
857 sta
= sta_info_get(sdata
, addr
);
858 ret
= __sta_info_destroy(sta
);
859 mutex_unlock(&sdata
->local
->sta_mtx
);
864 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data
*sdata
,
867 struct sta_info
*sta
;
870 mutex_lock(&sdata
->local
->sta_mtx
);
871 sta
= sta_info_get_bss(sdata
, addr
);
872 ret
= __sta_info_destroy(sta
);
873 mutex_unlock(&sdata
->local
->sta_mtx
);
878 static void sta_info_cleanup(unsigned long data
)
880 struct ieee80211_local
*local
= (struct ieee80211_local
*) data
;
881 struct sta_info
*sta
;
882 bool timer_needed
= false;
885 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
)
886 if (sta_info_cleanup_expire_buffered(local
, sta
))
890 if (local
->quiescing
)
896 mod_timer(&local
->sta_cleanup
,
897 round_jiffies(jiffies
+ STA_INFO_CLEANUP_INTERVAL
));
900 void sta_info_init(struct ieee80211_local
*local
)
902 spin_lock_init(&local
->tim_lock
);
903 mutex_init(&local
->sta_mtx
);
904 INIT_LIST_HEAD(&local
->sta_list
);
906 setup_timer(&local
->sta_cleanup
, sta_info_cleanup
,
907 (unsigned long)local
);
910 void sta_info_stop(struct ieee80211_local
*local
)
912 del_timer_sync(&local
->sta_cleanup
);
916 int sta_info_flush_defer(struct ieee80211_sub_if_data
*sdata
)
918 struct ieee80211_local
*local
= sdata
->local
;
919 struct sta_info
*sta
, *tmp
;
924 mutex_lock(&local
->sta_mtx
);
925 list_for_each_entry_safe(sta
, tmp
, &local
->sta_list
, list
) {
926 if (sdata
== sta
->sdata
) {
927 WARN_ON(__sta_info_destroy(sta
));
931 mutex_unlock(&local
->sta_mtx
);
936 void sta_info_flush_cleanup(struct ieee80211_sub_if_data
*sdata
)
938 ieee80211_cleanup_sdata_stas(sdata
);
939 cancel_work_sync(&sdata
->cleanup_stations_wk
);
942 void ieee80211_sta_expire(struct ieee80211_sub_if_data
*sdata
,
943 unsigned long exp_time
)
945 struct ieee80211_local
*local
= sdata
->local
;
946 struct sta_info
*sta
, *tmp
;
948 mutex_lock(&local
->sta_mtx
);
950 list_for_each_entry_safe(sta
, tmp
, &local
->sta_list
, list
) {
951 if (sdata
!= sta
->sdata
)
954 if (time_after(jiffies
, sta
->last_rx
+ exp_time
)) {
955 sta_dbg(sta
->sdata
, "expiring inactive STA %pM\n",
958 if (ieee80211_vif_is_mesh(&sdata
->vif
) &&
959 test_sta_flag(sta
, WLAN_STA_PS_STA
))
960 atomic_dec(&sdata
->u
.mesh
.ps
.num_sta_ps
);
962 WARN_ON(__sta_info_destroy(sta
));
966 mutex_unlock(&local
->sta_mtx
);
969 struct ieee80211_sta
*ieee80211_find_sta_by_ifaddr(struct ieee80211_hw
*hw
,
973 struct sta_info
*sta
, *nxt
;
976 * Just return a random station if localaddr is NULL
979 for_each_sta_info(hw_to_local(hw
), addr
, sta
, nxt
) {
981 !ether_addr_equal(sta
->sdata
->vif
.addr
, localaddr
))
990 EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr
);
992 struct ieee80211_sta
*ieee80211_find_sta(struct ieee80211_vif
*vif
,
995 struct sta_info
*sta
;
1000 sta
= sta_info_get_bss(vif_to_sdata(vif
), addr
);
1009 EXPORT_SYMBOL(ieee80211_find_sta
);
1011 static void clear_sta_ps_flags(void *_sta
)
1013 struct sta_info
*sta
= _sta
;
1014 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
1017 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1018 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
1019 ps
= &sdata
->bss
->ps
;
1020 else if (ieee80211_vif_is_mesh(&sdata
->vif
))
1021 ps
= &sdata
->u
.mesh
.ps
;
1025 clear_sta_flag(sta
, WLAN_STA_PS_DRIVER
);
1026 if (test_and_clear_sta_flag(sta
, WLAN_STA_PS_STA
))
1027 atomic_dec(&ps
->num_sta_ps
);
1030 /* powersave support code */
1031 void ieee80211_sta_ps_deliver_wakeup(struct sta_info
*sta
)
1033 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
1034 struct ieee80211_local
*local
= sdata
->local
;
1035 struct sk_buff_head pending
;
1036 int filtered
= 0, buffered
= 0, ac
;
1037 unsigned long flags
;
1039 clear_sta_flag(sta
, WLAN_STA_SP
);
1041 BUILD_BUG_ON(BITS_TO_LONGS(IEEE80211_NUM_TIDS
) > 1);
1042 sta
->driver_buffered_tids
= 0;
1044 if (!(local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
))
1045 drv_sta_notify(local
, sdata
, STA_NOTIFY_AWAKE
, &sta
->sta
);
1047 skb_queue_head_init(&pending
);
1049 /* sync with ieee80211_tx_h_unicast_ps_buf */
1050 spin_lock(&sta
->ps_lock
);
1051 /* Send all buffered frames to the station */
1052 for (ac
= 0; ac
< IEEE80211_NUM_ACS
; ac
++) {
1053 int count
= skb_queue_len(&pending
), tmp
;
1055 spin_lock_irqsave(&sta
->tx_filtered
[ac
].lock
, flags
);
1056 skb_queue_splice_tail_init(&sta
->tx_filtered
[ac
], &pending
);
1057 spin_unlock_irqrestore(&sta
->tx_filtered
[ac
].lock
, flags
);
1058 tmp
= skb_queue_len(&pending
);
1059 filtered
+= tmp
- count
;
1062 spin_lock_irqsave(&sta
->ps_tx_buf
[ac
].lock
, flags
);
1063 skb_queue_splice_tail_init(&sta
->ps_tx_buf
[ac
], &pending
);
1064 spin_unlock_irqrestore(&sta
->ps_tx_buf
[ac
].lock
, flags
);
1065 tmp
= skb_queue_len(&pending
);
1066 buffered
+= tmp
- count
;
1069 ieee80211_add_pending_skbs_fn(local
, &pending
, clear_sta_ps_flags
, sta
);
1070 spin_unlock(&sta
->ps_lock
);
1072 local
->total_ps_buffered
-= buffered
;
1074 sta_info_recalc_tim(sta
);
1077 "STA %pM aid %d sending %d filtered/%d PS frames since STA not sleeping anymore\n",
1078 sta
->sta
.addr
, sta
->sta
.aid
, filtered
, buffered
);
1081 static void ieee80211_send_null_response(struct ieee80211_sub_if_data
*sdata
,
1082 struct sta_info
*sta
, int tid
,
1083 enum ieee80211_frame_release_type reason
)
1085 struct ieee80211_local
*local
= sdata
->local
;
1086 struct ieee80211_qos_hdr
*nullfunc
;
1087 struct sk_buff
*skb
;
1088 int size
= sizeof(*nullfunc
);
1090 bool qos
= test_sta_flag(sta
, WLAN_STA_WME
);
1091 struct ieee80211_tx_info
*info
;
1092 struct ieee80211_chanctx_conf
*chanctx_conf
;
1095 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
|
1096 IEEE80211_STYPE_QOS_NULLFUNC
|
1097 IEEE80211_FCTL_FROMDS
);
1100 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
|
1101 IEEE80211_STYPE_NULLFUNC
|
1102 IEEE80211_FCTL_FROMDS
);
1105 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ size
);
1109 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
1111 nullfunc
= (void *) skb_put(skb
, size
);
1112 nullfunc
->frame_control
= fc
;
1113 nullfunc
->duration_id
= 0;
1114 memcpy(nullfunc
->addr1
, sta
->sta
.addr
, ETH_ALEN
);
1115 memcpy(nullfunc
->addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1116 memcpy(nullfunc
->addr3
, sdata
->vif
.addr
, ETH_ALEN
);
1117 nullfunc
->seq_ctrl
= 0;
1119 skb
->priority
= tid
;
1120 skb_set_queue_mapping(skb
, ieee802_1d_to_ac
[tid
]);
1122 nullfunc
->qos_ctrl
= cpu_to_le16(tid
);
1124 if (reason
== IEEE80211_FRAME_RELEASE_UAPSD
)
1125 nullfunc
->qos_ctrl
|=
1126 cpu_to_le16(IEEE80211_QOS_CTL_EOSP
);
1129 info
= IEEE80211_SKB_CB(skb
);
1132 * Tell TX path to send this frame even though the
1133 * STA may still remain is PS mode after this frame
1134 * exchange. Also set EOSP to indicate this packet
1135 * ends the poll/service period.
1137 info
->flags
|= IEEE80211_TX_CTL_NO_PS_BUFFER
|
1138 IEEE80211_TX_STATUS_EOSP
|
1139 IEEE80211_TX_CTL_REQ_TX_STATUS
;
1141 drv_allow_buffered_frames(local
, sta
, BIT(tid
), 1, reason
, false);
1143 skb
->dev
= sdata
->dev
;
1146 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
1147 if (WARN_ON(!chanctx_conf
)) {
1153 ieee80211_xmit(sdata
, skb
, chanctx_conf
->def
.chan
->band
);
1158 ieee80211_sta_ps_deliver_response(struct sta_info
*sta
,
1159 int n_frames
, u8 ignored_acs
,
1160 enum ieee80211_frame_release_type reason
)
1162 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
1163 struct ieee80211_local
*local
= sdata
->local
;
1165 bool more_data
= false;
1167 unsigned long driver_release_tids
= 0;
1168 struct sk_buff_head frames
;
1170 /* Service or PS-Poll period starts */
1171 set_sta_flag(sta
, WLAN_STA_SP
);
1173 __skb_queue_head_init(&frames
);
1176 * Get response frame(s) and more data bit for it.
1178 for (ac
= 0; ac
< IEEE80211_NUM_ACS
; ac
++) {
1181 if (ignored_acs
& BIT(ac
))
1184 tids
= ieee80211_tids_for_ac(ac
);
1187 driver_release_tids
= sta
->driver_buffered_tids
& tids
;
1188 if (driver_release_tids
) {
1191 struct sk_buff
*skb
;
1193 while (n_frames
> 0) {
1194 skb
= skb_dequeue(&sta
->tx_filtered
[ac
]);
1197 &sta
->ps_tx_buf
[ac
]);
1199 local
->total_ps_buffered
--;
1205 __skb_queue_tail(&frames
, skb
);
1210 * If the driver has data on more than one TID then
1211 * certainly there's more data if we release just a
1212 * single frame now (from a single TID).
1214 if (reason
== IEEE80211_FRAME_RELEASE_PSPOLL
&&
1215 hweight16(driver_release_tids
) > 1) {
1217 driver_release_tids
=
1218 BIT(ffs(driver_release_tids
) - 1);
1223 if (!skb_queue_empty(&sta
->tx_filtered
[ac
]) ||
1224 !skb_queue_empty(&sta
->ps_tx_buf
[ac
])) {
1234 * For PS-Poll, this can only happen due to a race condition
1235 * when we set the TIM bit and the station notices it, but
1236 * before it can poll for the frame we expire it.
1238 * For uAPSD, this is said in the standard (11.2.1.5 h):
1239 * At each unscheduled SP for a non-AP STA, the AP shall
1240 * attempt to transmit at least one MSDU or MMPDU, but no
1241 * more than the value specified in the Max SP Length field
1242 * in the QoS Capability element from delivery-enabled ACs,
1243 * that are destined for the non-AP STA.
1245 * Since we have no other MSDU/MMPDU, transmit a QoS null frame.
1248 /* This will evaluate to 1, 3, 5 or 7. */
1249 tid
= 7 - ((ffs(~ignored_acs
) - 1) << 1);
1251 ieee80211_send_null_response(sdata
, sta
, tid
, reason
);
1255 if (!driver_release_tids
) {
1256 struct sk_buff_head pending
;
1257 struct sk_buff
*skb
;
1261 skb_queue_head_init(&pending
);
1263 while ((skb
= __skb_dequeue(&frames
))) {
1264 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1265 struct ieee80211_hdr
*hdr
= (void *) skb
->data
;
1271 * Tell TX path to send this frame even though the
1272 * STA may still remain is PS mode after this frame
1275 info
->flags
|= IEEE80211_TX_CTL_NO_PS_BUFFER
;
1278 * Use MoreData flag to indicate whether there are
1279 * more buffered frames for this STA
1281 if (more_data
|| !skb_queue_empty(&frames
))
1282 hdr
->frame_control
|=
1283 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
1285 hdr
->frame_control
&=
1286 cpu_to_le16(~IEEE80211_FCTL_MOREDATA
);
1288 if (ieee80211_is_data_qos(hdr
->frame_control
) ||
1289 ieee80211_is_qos_nullfunc(hdr
->frame_control
))
1290 qoshdr
= ieee80211_get_qos_ctl(hdr
);
1292 /* end service period after last frame */
1293 if (skb_queue_empty(&frames
)) {
1294 if (reason
== IEEE80211_FRAME_RELEASE_UAPSD
&&
1296 *qoshdr
|= IEEE80211_QOS_CTL_EOSP
;
1298 info
->flags
|= IEEE80211_TX_STATUS_EOSP
|
1299 IEEE80211_TX_CTL_REQ_TX_STATUS
;
1303 tids
|= BIT(*qoshdr
& IEEE80211_QOS_CTL_TID_MASK
);
1307 __skb_queue_tail(&pending
, skb
);
1310 drv_allow_buffered_frames(local
, sta
, tids
, num
,
1313 ieee80211_add_pending_skbs(local
, &pending
);
1315 sta_info_recalc_tim(sta
);
1318 * We need to release a frame that is buffered somewhere in the
1319 * driver ... it'll have to handle that.
1320 * Note that, as per the comment above, it'll also have to see
1321 * if there is more than just one frame on the specific TID that
1322 * we're releasing from, and it needs to set the more-data bit
1323 * accordingly if we tell it that there's no more data. If we do
1324 * tell it there's more data, then of course the more-data bit
1325 * needs to be set anyway.
1327 drv_release_buffered_frames(local
, sta
, driver_release_tids
,
1328 n_frames
, reason
, more_data
);
1331 * Note that we don't recalculate the TIM bit here as it would
1332 * most likely have no effect at all unless the driver told us
1333 * that the TID became empty before returning here from the
1335 * Either way, however, when the driver tells us that the TID
1336 * became empty we'll do the TIM recalculation.
1341 void ieee80211_sta_ps_deliver_poll_response(struct sta_info
*sta
)
1343 u8 ignore_for_response
= sta
->sta
.uapsd_queues
;
1346 * If all ACs are delivery-enabled then we should reply
1347 * from any of them, if only some are enabled we reply
1348 * only from the non-enabled ones.
1350 if (ignore_for_response
== BIT(IEEE80211_NUM_ACS
) - 1)
1351 ignore_for_response
= 0;
1353 ieee80211_sta_ps_deliver_response(sta
, 1, ignore_for_response
,
1354 IEEE80211_FRAME_RELEASE_PSPOLL
);
1357 void ieee80211_sta_ps_deliver_uapsd(struct sta_info
*sta
)
1359 int n_frames
= sta
->sta
.max_sp
;
1360 u8 delivery_enabled
= sta
->sta
.uapsd_queues
;
1363 * If we ever grow support for TSPEC this might happen if
1364 * the TSPEC update from hostapd comes in between a trigger
1365 * frame setting WLAN_STA_UAPSD in the RX path and this
1366 * actually getting called.
1368 if (!delivery_enabled
)
1371 switch (sta
->sta
.max_sp
) {
1382 /* XXX: what is a good value? */
1387 ieee80211_sta_ps_deliver_response(sta
, n_frames
, ~delivery_enabled
,
1388 IEEE80211_FRAME_RELEASE_UAPSD
);
1391 void ieee80211_sta_block_awake(struct ieee80211_hw
*hw
,
1392 struct ieee80211_sta
*pubsta
, bool block
)
1394 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
1396 trace_api_sta_block_awake(sta
->local
, pubsta
, block
);
1399 set_sta_flag(sta
, WLAN_STA_PS_DRIVER
);
1400 else if (test_sta_flag(sta
, WLAN_STA_PS_DRIVER
))
1401 ieee80211_queue_work(hw
, &sta
->drv_unblock_wk
);
1403 EXPORT_SYMBOL(ieee80211_sta_block_awake
);
1405 void ieee80211_sta_eosp(struct ieee80211_sta
*pubsta
)
1407 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
1408 struct ieee80211_local
*local
= sta
->local
;
1410 trace_api_eosp(local
, pubsta
);
1412 clear_sta_flag(sta
, WLAN_STA_SP
);
1414 EXPORT_SYMBOL(ieee80211_sta_eosp
);
1416 void ieee80211_sta_set_buffered(struct ieee80211_sta
*pubsta
,
1417 u8 tid
, bool buffered
)
1419 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
1421 if (WARN_ON(tid
>= IEEE80211_NUM_TIDS
))
1425 set_bit(tid
, &sta
->driver_buffered_tids
);
1427 clear_bit(tid
, &sta
->driver_buffered_tids
);
1429 sta_info_recalc_tim(sta
);
1431 EXPORT_SYMBOL(ieee80211_sta_set_buffered
);
1433 int sta_info_move_state(struct sta_info
*sta
,
1434 enum ieee80211_sta_state new_state
)
1438 if (sta
->sta_state
== new_state
)
1441 /* check allowed transitions first */
1443 switch (new_state
) {
1444 case IEEE80211_STA_NONE
:
1445 if (sta
->sta_state
!= IEEE80211_STA_AUTH
)
1448 case IEEE80211_STA_AUTH
:
1449 if (sta
->sta_state
!= IEEE80211_STA_NONE
&&
1450 sta
->sta_state
!= IEEE80211_STA_ASSOC
)
1453 case IEEE80211_STA_ASSOC
:
1454 if (sta
->sta_state
!= IEEE80211_STA_AUTH
&&
1455 sta
->sta_state
!= IEEE80211_STA_AUTHORIZED
)
1458 case IEEE80211_STA_AUTHORIZED
:
1459 if (sta
->sta_state
!= IEEE80211_STA_ASSOC
)
1463 WARN(1, "invalid state %d", new_state
);
1467 sta_dbg(sta
->sdata
, "moving STA %pM to state %d\n",
1468 sta
->sta
.addr
, new_state
);
1471 * notify the driver before the actual changes so it can
1472 * fail the transition
1474 if (test_sta_flag(sta
, WLAN_STA_INSERTED
)) {
1475 int err
= drv_sta_state(sta
->local
, sta
->sdata
, sta
,
1476 sta
->sta_state
, new_state
);
1481 /* reflect the change in all state variables */
1483 switch (new_state
) {
1484 case IEEE80211_STA_NONE
:
1485 if (sta
->sta_state
== IEEE80211_STA_AUTH
)
1486 clear_bit(WLAN_STA_AUTH
, &sta
->_flags
);
1488 case IEEE80211_STA_AUTH
:
1489 if (sta
->sta_state
== IEEE80211_STA_NONE
)
1490 set_bit(WLAN_STA_AUTH
, &sta
->_flags
);
1491 else if (sta
->sta_state
== IEEE80211_STA_ASSOC
)
1492 clear_bit(WLAN_STA_ASSOC
, &sta
->_flags
);
1494 case IEEE80211_STA_ASSOC
:
1495 if (sta
->sta_state
== IEEE80211_STA_AUTH
) {
1496 set_bit(WLAN_STA_ASSOC
, &sta
->_flags
);
1497 } else if (sta
->sta_state
== IEEE80211_STA_AUTHORIZED
) {
1498 if (sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1499 (sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1500 !sta
->sdata
->u
.vlan
.sta
))
1501 atomic_dec(&sta
->sdata
->bss
->num_mcast_sta
);
1502 clear_bit(WLAN_STA_AUTHORIZED
, &sta
->_flags
);
1505 case IEEE80211_STA_AUTHORIZED
:
1506 if (sta
->sta_state
== IEEE80211_STA_ASSOC
) {
1507 if (sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1508 (sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1509 !sta
->sdata
->u
.vlan
.sta
))
1510 atomic_inc(&sta
->sdata
->bss
->num_mcast_sta
);
1511 set_bit(WLAN_STA_AUTHORIZED
, &sta
->_flags
);
1518 sta
->sta_state
= new_state
;