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
;
126 clear_sta_flag(sta
, WLAN_STA_PS_STA
);
128 atomic_dec(&ps
->num_sta_ps
);
129 sta_info_recalc_tim(sta
);
132 for (ac
= 0; ac
< IEEE80211_NUM_ACS
; ac
++) {
133 local
->total_ps_buffered
-= skb_queue_len(&sta
->ps_tx_buf
[ac
]);
134 ieee80211_purge_tx_queue(&local
->hw
, &sta
->ps_tx_buf
[ac
]);
135 ieee80211_purge_tx_queue(&local
->hw
, &sta
->tx_filtered
[ac
]);
138 #ifdef CONFIG_MAC80211_MESH
139 if (ieee80211_vif_is_mesh(&sdata
->vif
)) {
140 mesh_accept_plinks_update(sdata
);
141 mesh_plink_deactivate(sta
);
142 del_timer_sync(&sta
->plink_timer
);
146 cancel_work_sync(&sta
->drv_unblock_wk
);
149 * Destroy aggregation state here. It would be nice to wait for the
150 * driver to finish aggregation stop and then clean up, but for now
151 * drivers have to handle aggregation stop being requested, followed
152 * directly by station destruction.
154 for (i
= 0; i
< IEEE80211_NUM_TIDS
; i
++) {
155 tid_tx
= rcu_dereference_raw(sta
->ampdu_mlme
.tid_tx
[i
]);
158 ieee80211_purge_tx_queue(&local
->hw
, &tid_tx
->pending
);
162 sta_info_free(local
, sta
);
165 void ieee80211_cleanup_sdata_stas(struct ieee80211_sub_if_data
*sdata
)
167 struct sta_info
*sta
;
169 spin_lock_bh(&sdata
->cleanup_stations_lock
);
170 while (!list_empty(&sdata
->cleanup_stations
)) {
171 sta
= list_first_entry(&sdata
->cleanup_stations
,
172 struct sta_info
, list
);
173 list_del(&sta
->list
);
174 spin_unlock_bh(&sdata
->cleanup_stations_lock
);
176 cleanup_single_sta(sta
);
178 spin_lock_bh(&sdata
->cleanup_stations_lock
);
181 spin_unlock_bh(&sdata
->cleanup_stations_lock
);
184 static void free_sta_rcu(struct rcu_head
*h
)
186 struct sta_info
*sta
= container_of(h
, struct sta_info
, rcu_head
);
187 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
189 spin_lock(&sdata
->cleanup_stations_lock
);
190 list_add_tail(&sta
->list
, &sdata
->cleanup_stations
);
191 spin_unlock(&sdata
->cleanup_stations_lock
);
193 ieee80211_queue_work(&sdata
->local
->hw
, &sdata
->cleanup_stations_wk
);
196 /* protected by RCU */
197 struct sta_info
*sta_info_get(struct ieee80211_sub_if_data
*sdata
,
200 struct ieee80211_local
*local
= sdata
->local
;
201 struct sta_info
*sta
;
203 sta
= rcu_dereference_check(local
->sta_hash
[STA_HASH(addr
)],
204 lockdep_is_held(&local
->sta_mtx
));
206 if (sta
->sdata
== sdata
&&
207 ether_addr_equal(sta
->sta
.addr
, addr
))
209 sta
= rcu_dereference_check(sta
->hnext
,
210 lockdep_is_held(&local
->sta_mtx
));
216 * Get sta info either from the specified interface
217 * or from one of its vlans
219 struct sta_info
*sta_info_get_bss(struct ieee80211_sub_if_data
*sdata
,
222 struct ieee80211_local
*local
= sdata
->local
;
223 struct sta_info
*sta
;
225 sta
= rcu_dereference_check(local
->sta_hash
[STA_HASH(addr
)],
226 lockdep_is_held(&local
->sta_mtx
));
228 if ((sta
->sdata
== sdata
||
229 (sta
->sdata
->bss
&& sta
->sdata
->bss
== sdata
->bss
)) &&
230 ether_addr_equal(sta
->sta
.addr
, addr
))
232 sta
= rcu_dereference_check(sta
->hnext
,
233 lockdep_is_held(&local
->sta_mtx
));
238 struct sta_info
*sta_info_get_by_idx(struct ieee80211_sub_if_data
*sdata
,
241 struct ieee80211_local
*local
= sdata
->local
;
242 struct sta_info
*sta
;
245 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
) {
246 if (sdata
!= sta
->sdata
)
259 * sta_info_free - free STA
261 * @local: pointer to the global information
262 * @sta: STA info to free
264 * This function must undo everything done by sta_info_alloc()
265 * that may happen before sta_info_insert(). It may only be
266 * called when sta_info_insert() has not been attempted (and
267 * if that fails, the station is freed anyway.)
269 void sta_info_free(struct ieee80211_local
*local
, struct sta_info
*sta
)
272 rate_control_free_sta(sta
);
274 sta_dbg(sta
->sdata
, "Destroyed STA %pM\n", sta
->sta
.addr
);
279 /* Caller must hold local->sta_mtx */
280 static void sta_info_hash_add(struct ieee80211_local
*local
,
281 struct sta_info
*sta
)
283 lockdep_assert_held(&local
->sta_mtx
);
284 sta
->hnext
= local
->sta_hash
[STA_HASH(sta
->sta
.addr
)];
285 rcu_assign_pointer(local
->sta_hash
[STA_HASH(sta
->sta
.addr
)], sta
);
288 static void sta_unblock(struct work_struct
*wk
)
290 struct sta_info
*sta
;
292 sta
= container_of(wk
, struct sta_info
, drv_unblock_wk
);
297 if (!test_sta_flag(sta
, WLAN_STA_PS_STA
)) {
299 ieee80211_sta_ps_deliver_wakeup(sta
);
301 } else if (test_and_clear_sta_flag(sta
, WLAN_STA_PSPOLL
)) {
302 clear_sta_flag(sta
, WLAN_STA_PS_DRIVER
);
305 ieee80211_sta_ps_deliver_poll_response(sta
);
307 } else if (test_and_clear_sta_flag(sta
, WLAN_STA_UAPSD
)) {
308 clear_sta_flag(sta
, WLAN_STA_PS_DRIVER
);
311 ieee80211_sta_ps_deliver_uapsd(sta
);
314 clear_sta_flag(sta
, WLAN_STA_PS_DRIVER
);
317 static int sta_prepare_rate_control(struct ieee80211_local
*local
,
318 struct sta_info
*sta
, gfp_t gfp
)
320 if (local
->hw
.flags
& IEEE80211_HW_HAS_RATE_CONTROL
)
323 sta
->rate_ctrl
= local
->rate_ctrl
;
324 sta
->rate_ctrl_priv
= rate_control_alloc_sta(sta
->rate_ctrl
,
326 if (!sta
->rate_ctrl_priv
)
332 struct sta_info
*sta_info_alloc(struct ieee80211_sub_if_data
*sdata
,
333 const u8
*addr
, gfp_t gfp
)
335 struct ieee80211_local
*local
= sdata
->local
;
336 struct sta_info
*sta
;
337 struct timespec uptime
;
340 sta
= kzalloc(sizeof(*sta
) + local
->hw
.sta_data_size
, gfp
);
344 spin_lock_init(&sta
->lock
);
345 INIT_WORK(&sta
->drv_unblock_wk
, sta_unblock
);
346 INIT_WORK(&sta
->ampdu_mlme
.work
, ieee80211_ba_session_work
);
347 mutex_init(&sta
->ampdu_mlme
.mtx
);
349 memcpy(sta
->sta
.addr
, addr
, ETH_ALEN
);
352 sta
->last_rx
= jiffies
;
354 sta
->sta_state
= IEEE80211_STA_NONE
;
356 do_posix_clock_monotonic_gettime(&uptime
);
357 sta
->last_connected
= uptime
.tv_sec
;
358 ewma_init(&sta
->avg_signal
, 1024, 8);
360 if (sta_prepare_rate_control(local
, sta
, gfp
)) {
365 for (i
= 0; i
< IEEE80211_NUM_TIDS
; i
++) {
367 * timer_to_tid must be initialized with identity mapping
368 * to enable session_timer's data differentiation. See
369 * sta_rx_agg_session_timer_expired for usage.
371 sta
->timer_to_tid
[i
] = i
;
373 for (i
= 0; i
< IEEE80211_NUM_ACS
; i
++) {
374 skb_queue_head_init(&sta
->ps_tx_buf
[i
]);
375 skb_queue_head_init(&sta
->tx_filtered
[i
]);
378 for (i
= 0; i
< IEEE80211_NUM_TIDS
; i
++)
379 sta
->last_seq_ctrl
[i
] = cpu_to_le16(USHRT_MAX
);
381 sta_dbg(sdata
, "Allocated STA %pM\n", sta
->sta
.addr
);
383 #ifdef CONFIG_MAC80211_MESH
384 sta
->plink_state
= NL80211_PLINK_LISTEN
;
385 init_timer(&sta
->plink_timer
);
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 unsigned long ieee80211_tids_for_ac(int ac
)
562 /* If we ever support TIDs > 7, this obviously needs to be adjusted */
564 case IEEE80211_AC_VO
:
565 return BIT(6) | BIT(7);
566 case IEEE80211_AC_VI
:
567 return BIT(4) | BIT(5);
568 case IEEE80211_AC_BE
:
569 return BIT(0) | BIT(3);
570 case IEEE80211_AC_BK
:
571 return BIT(1) | BIT(2);
578 void sta_info_recalc_tim(struct sta_info
*sta
)
580 struct ieee80211_local
*local
= sta
->local
;
583 bool indicate_tim
= false;
584 u8 ignore_for_tim
= sta
->sta
.uapsd_queues
;
588 if (sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
589 sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) {
590 if (WARN_ON_ONCE(!sta
->sdata
->bss
))
593 ps
= &sta
->sdata
->bss
->ps
;
599 /* No need to do anything if the driver does all */
600 if (local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
)
607 * If all ACs are delivery-enabled then we should build
608 * the TIM bit for all ACs anyway; if only some are then
609 * we ignore those and build the TIM bit using only the
612 if (ignore_for_tim
== BIT(IEEE80211_NUM_ACS
) - 1)
615 for (ac
= 0; ac
< IEEE80211_NUM_ACS
; ac
++) {
618 if (ignore_for_tim
& BIT(ac
))
621 indicate_tim
|= !skb_queue_empty(&sta
->tx_filtered
[ac
]) ||
622 !skb_queue_empty(&sta
->ps_tx_buf
[ac
]);
626 tids
= ieee80211_tids_for_ac(ac
);
629 sta
->driver_buffered_tids
& tids
;
633 spin_lock_irqsave(&local
->tim_lock
, flags
);
636 __bss_tim_set(ps
->tim
, id
);
638 __bss_tim_clear(ps
->tim
, id
);
640 if (local
->ops
->set_tim
) {
641 local
->tim_in_locked_section
= true;
642 drv_set_tim(local
, &sta
->sta
, indicate_tim
);
643 local
->tim_in_locked_section
= false;
646 spin_unlock_irqrestore(&local
->tim_lock
, flags
);
649 static bool sta_info_buffer_expired(struct sta_info
*sta
, struct sk_buff
*skb
)
651 struct ieee80211_tx_info
*info
;
657 info
= IEEE80211_SKB_CB(skb
);
659 /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
660 timeout
= (sta
->listen_interval
*
661 sta
->sdata
->vif
.bss_conf
.beacon_int
*
663 if (timeout
< STA_TX_BUFFER_EXPIRE
)
664 timeout
= STA_TX_BUFFER_EXPIRE
;
665 return time_after(jiffies
, info
->control
.jiffies
+ timeout
);
669 static bool sta_info_cleanup_expire_buffered_ac(struct ieee80211_local
*local
,
670 struct sta_info
*sta
, int ac
)
676 * First check for frames that should expire on the filtered
677 * queue. Frames here were rejected by the driver and are on
678 * a separate queue to avoid reordering with normal PS-buffered
679 * frames. They also aren't accounted for right now in the
680 * total_ps_buffered counter.
683 spin_lock_irqsave(&sta
->tx_filtered
[ac
].lock
, flags
);
684 skb
= skb_peek(&sta
->tx_filtered
[ac
]);
685 if (sta_info_buffer_expired(sta
, skb
))
686 skb
= __skb_dequeue(&sta
->tx_filtered
[ac
]);
689 spin_unlock_irqrestore(&sta
->tx_filtered
[ac
].lock
, flags
);
692 * Frames are queued in order, so if this one
693 * hasn't expired yet we can stop testing. If
694 * we actually reached the end of the queue we
695 * also need to stop, of course.
699 ieee80211_free_txskb(&local
->hw
, skb
);
703 * Now also check the normal PS-buffered queue, this will
704 * only find something if the filtered queue was emptied
705 * since the filtered frames are all before the normal PS
709 spin_lock_irqsave(&sta
->ps_tx_buf
[ac
].lock
, flags
);
710 skb
= skb_peek(&sta
->ps_tx_buf
[ac
]);
711 if (sta_info_buffer_expired(sta
, skb
))
712 skb
= __skb_dequeue(&sta
->ps_tx_buf
[ac
]);
715 spin_unlock_irqrestore(&sta
->ps_tx_buf
[ac
].lock
, flags
);
718 * frames are queued in order, so if this one
719 * hasn't expired yet (or we reached the end of
720 * the queue) we can stop testing
725 local
->total_ps_buffered
--;
726 ps_dbg(sta
->sdata
, "Buffered frame expired (STA %pM)\n",
728 ieee80211_free_txskb(&local
->hw
, skb
);
732 * Finally, recalculate the TIM bit for this station -- it might
733 * now be clear because the station was too slow to retrieve its
736 sta_info_recalc_tim(sta
);
739 * Return whether there are any frames still buffered, this is
740 * used to check whether the cleanup timer still needs to run,
741 * if there are no frames we don't need to rearm the timer.
743 return !(skb_queue_empty(&sta
->ps_tx_buf
[ac
]) &&
744 skb_queue_empty(&sta
->tx_filtered
[ac
]));
747 static bool sta_info_cleanup_expire_buffered(struct ieee80211_local
*local
,
748 struct sta_info
*sta
)
750 bool have_buffered
= false;
753 /* This is only necessary for stations on BSS interfaces */
754 if (!sta
->sdata
->bss
)
757 for (ac
= 0; ac
< IEEE80211_NUM_ACS
; ac
++)
759 sta_info_cleanup_expire_buffered_ac(local
, sta
, ac
);
761 return have_buffered
;
764 int __must_check
__sta_info_destroy(struct sta_info
*sta
)
766 struct ieee80211_local
*local
;
767 struct ieee80211_sub_if_data
*sdata
;
778 lockdep_assert_held(&local
->sta_mtx
);
781 * Before removing the station from the driver and
782 * rate control, it might still start new aggregation
783 * sessions -- block that to make sure the tear-down
784 * will be sufficient.
786 set_sta_flag(sta
, WLAN_STA_BLOCK_BA
);
787 ieee80211_sta_tear_down_BA_sessions(sta
, false);
789 ret
= sta_info_hash_del(local
, sta
);
793 list_del_rcu(&sta
->list
);
795 mutex_lock(&local
->key_mtx
);
796 for (i
= 0; i
< NUM_DEFAULT_KEYS
; i
++)
797 __ieee80211_key_free(key_mtx_dereference(local
, sta
->gtk
[i
]));
799 __ieee80211_key_free(key_mtx_dereference(local
, sta
->ptk
));
800 mutex_unlock(&local
->key_mtx
);
805 local
->sta_generation
++;
807 if (sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
808 RCU_INIT_POINTER(sdata
->u
.vlan
.sta
, NULL
);
810 while (sta
->sta_state
> IEEE80211_STA_NONE
) {
811 ret
= sta_info_move_state(sta
, sta
->sta_state
- 1);
819 ret
= drv_sta_state(local
, sdata
, sta
, IEEE80211_STA_NONE
,
820 IEEE80211_STA_NOTEXIST
);
821 WARN_ON_ONCE(ret
!= 0);
824 sta_dbg(sdata
, "Removed STA %pM\n", sta
->sta
.addr
);
826 cfg80211_del_sta(sdata
->dev
, sta
->sta
.addr
, GFP_KERNEL
);
828 rate_control_remove_sta_debugfs(sta
);
829 ieee80211_sta_debugfs_remove(sta
);
831 call_rcu(&sta
->rcu_head
, free_sta_rcu
);
836 int sta_info_destroy_addr(struct ieee80211_sub_if_data
*sdata
, const u8
*addr
)
838 struct sta_info
*sta
;
841 mutex_lock(&sdata
->local
->sta_mtx
);
842 sta
= sta_info_get(sdata
, addr
);
843 ret
= __sta_info_destroy(sta
);
844 mutex_unlock(&sdata
->local
->sta_mtx
);
849 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data
*sdata
,
852 struct sta_info
*sta
;
855 mutex_lock(&sdata
->local
->sta_mtx
);
856 sta
= sta_info_get_bss(sdata
, addr
);
857 ret
= __sta_info_destroy(sta
);
858 mutex_unlock(&sdata
->local
->sta_mtx
);
863 static void sta_info_cleanup(unsigned long data
)
865 struct ieee80211_local
*local
= (struct ieee80211_local
*) data
;
866 struct sta_info
*sta
;
867 bool timer_needed
= false;
870 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
)
871 if (sta_info_cleanup_expire_buffered(local
, sta
))
875 if (local
->quiescing
)
881 mod_timer(&local
->sta_cleanup
,
882 round_jiffies(jiffies
+ STA_INFO_CLEANUP_INTERVAL
));
885 void sta_info_init(struct ieee80211_local
*local
)
887 spin_lock_init(&local
->tim_lock
);
888 mutex_init(&local
->sta_mtx
);
889 INIT_LIST_HEAD(&local
->sta_list
);
891 setup_timer(&local
->sta_cleanup
, sta_info_cleanup
,
892 (unsigned long)local
);
895 void sta_info_stop(struct ieee80211_local
*local
)
897 del_timer_sync(&local
->sta_cleanup
);
901 int sta_info_flush_defer(struct ieee80211_sub_if_data
*sdata
)
903 struct ieee80211_local
*local
= sdata
->local
;
904 struct sta_info
*sta
, *tmp
;
909 mutex_lock(&local
->sta_mtx
);
910 list_for_each_entry_safe(sta
, tmp
, &local
->sta_list
, list
) {
911 if (sdata
== sta
->sdata
) {
912 WARN_ON(__sta_info_destroy(sta
));
916 mutex_unlock(&local
->sta_mtx
);
921 void sta_info_flush_cleanup(struct ieee80211_sub_if_data
*sdata
)
925 ieee80211_cleanup_sdata_stas(sdata
);
926 cancel_work_sync(&sdata
->cleanup_stations_wk
);
929 void ieee80211_sta_expire(struct ieee80211_sub_if_data
*sdata
,
930 unsigned long exp_time
)
932 struct ieee80211_local
*local
= sdata
->local
;
933 struct sta_info
*sta
, *tmp
;
935 mutex_lock(&local
->sta_mtx
);
937 list_for_each_entry_safe(sta
, tmp
, &local
->sta_list
, list
) {
938 if (sdata
!= sta
->sdata
)
941 if (time_after(jiffies
, sta
->last_rx
+ exp_time
)) {
942 sta_dbg(sta
->sdata
, "expiring inactive STA %pM\n",
944 WARN_ON(__sta_info_destroy(sta
));
948 mutex_unlock(&local
->sta_mtx
);
951 struct ieee80211_sta
*ieee80211_find_sta_by_ifaddr(struct ieee80211_hw
*hw
,
955 struct sta_info
*sta
, *nxt
;
958 * Just return a random station if localaddr is NULL
961 for_each_sta_info(hw_to_local(hw
), addr
, sta
, nxt
) {
963 !ether_addr_equal(sta
->sdata
->vif
.addr
, localaddr
))
972 EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr
);
974 struct ieee80211_sta
*ieee80211_find_sta(struct ieee80211_vif
*vif
,
977 struct sta_info
*sta
;
982 sta
= sta_info_get_bss(vif_to_sdata(vif
), addr
);
991 EXPORT_SYMBOL(ieee80211_find_sta
);
993 static void clear_sta_ps_flags(void *_sta
)
995 struct sta_info
*sta
= _sta
;
996 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
999 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1000 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
1001 ps
= &sdata
->bss
->ps
;
1005 clear_sta_flag(sta
, WLAN_STA_PS_DRIVER
);
1006 if (test_and_clear_sta_flag(sta
, WLAN_STA_PS_STA
))
1007 atomic_dec(&ps
->num_sta_ps
);
1010 /* powersave support code */
1011 void ieee80211_sta_ps_deliver_wakeup(struct sta_info
*sta
)
1013 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
1014 struct ieee80211_local
*local
= sdata
->local
;
1015 struct sk_buff_head pending
;
1016 int filtered
= 0, buffered
= 0, ac
;
1017 unsigned long flags
;
1019 clear_sta_flag(sta
, WLAN_STA_SP
);
1021 BUILD_BUG_ON(BITS_TO_LONGS(IEEE80211_NUM_TIDS
) > 1);
1022 sta
->driver_buffered_tids
= 0;
1024 if (!(local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
))
1025 drv_sta_notify(local
, sdata
, STA_NOTIFY_AWAKE
, &sta
->sta
);
1027 skb_queue_head_init(&pending
);
1029 /* Send all buffered frames to the station */
1030 for (ac
= 0; ac
< IEEE80211_NUM_ACS
; ac
++) {
1031 int count
= skb_queue_len(&pending
), tmp
;
1033 spin_lock_irqsave(&sta
->tx_filtered
[ac
].lock
, flags
);
1034 skb_queue_splice_tail_init(&sta
->tx_filtered
[ac
], &pending
);
1035 spin_unlock_irqrestore(&sta
->tx_filtered
[ac
].lock
, flags
);
1036 tmp
= skb_queue_len(&pending
);
1037 filtered
+= tmp
- count
;
1040 spin_lock_irqsave(&sta
->ps_tx_buf
[ac
].lock
, flags
);
1041 skb_queue_splice_tail_init(&sta
->ps_tx_buf
[ac
], &pending
);
1042 spin_unlock_irqrestore(&sta
->ps_tx_buf
[ac
].lock
, flags
);
1043 tmp
= skb_queue_len(&pending
);
1044 buffered
+= tmp
- count
;
1047 ieee80211_add_pending_skbs_fn(local
, &pending
, clear_sta_ps_flags
, sta
);
1049 local
->total_ps_buffered
-= buffered
;
1051 sta_info_recalc_tim(sta
);
1054 "STA %pM aid %d sending %d filtered/%d PS frames since STA not sleeping anymore\n",
1055 sta
->sta
.addr
, sta
->sta
.aid
, filtered
, buffered
);
1058 static void ieee80211_send_null_response(struct ieee80211_sub_if_data
*sdata
,
1059 struct sta_info
*sta
, int tid
,
1060 enum ieee80211_frame_release_type reason
)
1062 struct ieee80211_local
*local
= sdata
->local
;
1063 struct ieee80211_qos_hdr
*nullfunc
;
1064 struct sk_buff
*skb
;
1065 int size
= sizeof(*nullfunc
);
1067 bool qos
= test_sta_flag(sta
, WLAN_STA_WME
);
1068 struct ieee80211_tx_info
*info
;
1069 struct ieee80211_chanctx_conf
*chanctx_conf
;
1072 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
|
1073 IEEE80211_STYPE_QOS_NULLFUNC
|
1074 IEEE80211_FCTL_FROMDS
);
1077 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
|
1078 IEEE80211_STYPE_NULLFUNC
|
1079 IEEE80211_FCTL_FROMDS
);
1082 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ size
);
1086 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
1088 nullfunc
= (void *) skb_put(skb
, size
);
1089 nullfunc
->frame_control
= fc
;
1090 nullfunc
->duration_id
= 0;
1091 memcpy(nullfunc
->addr1
, sta
->sta
.addr
, ETH_ALEN
);
1092 memcpy(nullfunc
->addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1093 memcpy(nullfunc
->addr3
, sdata
->vif
.addr
, ETH_ALEN
);
1095 skb
->priority
= tid
;
1096 skb_set_queue_mapping(skb
, ieee802_1d_to_ac
[tid
]);
1098 nullfunc
->qos_ctrl
= cpu_to_le16(tid
);
1100 if (reason
== IEEE80211_FRAME_RELEASE_UAPSD
)
1101 nullfunc
->qos_ctrl
|=
1102 cpu_to_le16(IEEE80211_QOS_CTL_EOSP
);
1105 info
= IEEE80211_SKB_CB(skb
);
1108 * Tell TX path to send this frame even though the
1109 * STA may still remain is PS mode after this frame
1110 * exchange. Also set EOSP to indicate this packet
1111 * ends the poll/service period.
1113 info
->flags
|= IEEE80211_TX_CTL_NO_PS_BUFFER
|
1114 IEEE80211_TX_STATUS_EOSP
|
1115 IEEE80211_TX_CTL_REQ_TX_STATUS
;
1117 drv_allow_buffered_frames(local
, sta
, BIT(tid
), 1, reason
, false);
1120 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
1121 if (WARN_ON(!chanctx_conf
)) {
1127 ieee80211_xmit(sdata
, skb
, chanctx_conf
->def
.chan
->band
);
1132 ieee80211_sta_ps_deliver_response(struct sta_info
*sta
,
1133 int n_frames
, u8 ignored_acs
,
1134 enum ieee80211_frame_release_type reason
)
1136 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
1137 struct ieee80211_local
*local
= sdata
->local
;
1139 bool more_data
= false;
1141 unsigned long driver_release_tids
= 0;
1142 struct sk_buff_head frames
;
1144 /* Service or PS-Poll period starts */
1145 set_sta_flag(sta
, WLAN_STA_SP
);
1147 __skb_queue_head_init(&frames
);
1150 * Get response frame(s) and more data bit for it.
1152 for (ac
= 0; ac
< IEEE80211_NUM_ACS
; ac
++) {
1155 if (ignored_acs
& BIT(ac
))
1158 tids
= ieee80211_tids_for_ac(ac
);
1161 driver_release_tids
= sta
->driver_buffered_tids
& tids
;
1162 if (driver_release_tids
) {
1165 struct sk_buff
*skb
;
1167 while (n_frames
> 0) {
1168 skb
= skb_dequeue(&sta
->tx_filtered
[ac
]);
1171 &sta
->ps_tx_buf
[ac
]);
1173 local
->total_ps_buffered
--;
1179 __skb_queue_tail(&frames
, skb
);
1184 * If the driver has data on more than one TID then
1185 * certainly there's more data if we release just a
1186 * single frame now (from a single TID).
1188 if (reason
== IEEE80211_FRAME_RELEASE_PSPOLL
&&
1189 hweight16(driver_release_tids
) > 1) {
1191 driver_release_tids
=
1192 BIT(ffs(driver_release_tids
) - 1);
1197 if (!skb_queue_empty(&sta
->tx_filtered
[ac
]) ||
1198 !skb_queue_empty(&sta
->ps_tx_buf
[ac
])) {
1208 * For PS-Poll, this can only happen due to a race condition
1209 * when we set the TIM bit and the station notices it, but
1210 * before it can poll for the frame we expire it.
1212 * For uAPSD, this is said in the standard (11.2.1.5 h):
1213 * At each unscheduled SP for a non-AP STA, the AP shall
1214 * attempt to transmit at least one MSDU or MMPDU, but no
1215 * more than the value specified in the Max SP Length field
1216 * in the QoS Capability element from delivery-enabled ACs,
1217 * that are destined for the non-AP STA.
1219 * Since we have no other MSDU/MMPDU, transmit a QoS null frame.
1222 /* This will evaluate to 1, 3, 5 or 7. */
1223 tid
= 7 - ((ffs(~ignored_acs
) - 1) << 1);
1225 ieee80211_send_null_response(sdata
, sta
, tid
, reason
);
1229 if (!driver_release_tids
) {
1230 struct sk_buff_head pending
;
1231 struct sk_buff
*skb
;
1235 skb_queue_head_init(&pending
);
1237 while ((skb
= __skb_dequeue(&frames
))) {
1238 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1239 struct ieee80211_hdr
*hdr
= (void *) skb
->data
;
1245 * Tell TX path to send this frame even though the
1246 * STA may still remain is PS mode after this frame
1249 info
->flags
|= IEEE80211_TX_CTL_NO_PS_BUFFER
;
1252 * Use MoreData flag to indicate whether there are
1253 * more buffered frames for this STA
1255 if (more_data
|| !skb_queue_empty(&frames
))
1256 hdr
->frame_control
|=
1257 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
1259 hdr
->frame_control
&=
1260 cpu_to_le16(~IEEE80211_FCTL_MOREDATA
);
1262 if (ieee80211_is_data_qos(hdr
->frame_control
) ||
1263 ieee80211_is_qos_nullfunc(hdr
->frame_control
))
1264 qoshdr
= ieee80211_get_qos_ctl(hdr
);
1266 /* end service period after last frame */
1267 if (skb_queue_empty(&frames
)) {
1268 if (reason
== IEEE80211_FRAME_RELEASE_UAPSD
&&
1270 *qoshdr
|= IEEE80211_QOS_CTL_EOSP
;
1272 info
->flags
|= IEEE80211_TX_STATUS_EOSP
|
1273 IEEE80211_TX_CTL_REQ_TX_STATUS
;
1277 tids
|= BIT(*qoshdr
& IEEE80211_QOS_CTL_TID_MASK
);
1281 __skb_queue_tail(&pending
, skb
);
1284 drv_allow_buffered_frames(local
, sta
, tids
, num
,
1287 ieee80211_add_pending_skbs(local
, &pending
);
1289 sta_info_recalc_tim(sta
);
1292 * We need to release a frame that is buffered somewhere in the
1293 * driver ... it'll have to handle that.
1294 * Note that, as per the comment above, it'll also have to see
1295 * if there is more than just one frame on the specific TID that
1296 * we're releasing from, and it needs to set the more-data bit
1297 * accordingly if we tell it that there's no more data. If we do
1298 * tell it there's more data, then of course the more-data bit
1299 * needs to be set anyway.
1301 drv_release_buffered_frames(local
, sta
, driver_release_tids
,
1302 n_frames
, reason
, more_data
);
1305 * Note that we don't recalculate the TIM bit here as it would
1306 * most likely have no effect at all unless the driver told us
1307 * that the TID became empty before returning here from the
1309 * Either way, however, when the driver tells us that the TID
1310 * became empty we'll do the TIM recalculation.
1315 void ieee80211_sta_ps_deliver_poll_response(struct sta_info
*sta
)
1317 u8 ignore_for_response
= sta
->sta
.uapsd_queues
;
1320 * If all ACs are delivery-enabled then we should reply
1321 * from any of them, if only some are enabled we reply
1322 * only from the non-enabled ones.
1324 if (ignore_for_response
== BIT(IEEE80211_NUM_ACS
) - 1)
1325 ignore_for_response
= 0;
1327 ieee80211_sta_ps_deliver_response(sta
, 1, ignore_for_response
,
1328 IEEE80211_FRAME_RELEASE_PSPOLL
);
1331 void ieee80211_sta_ps_deliver_uapsd(struct sta_info
*sta
)
1333 int n_frames
= sta
->sta
.max_sp
;
1334 u8 delivery_enabled
= sta
->sta
.uapsd_queues
;
1337 * If we ever grow support for TSPEC this might happen if
1338 * the TSPEC update from hostapd comes in between a trigger
1339 * frame setting WLAN_STA_UAPSD in the RX path and this
1340 * actually getting called.
1342 if (!delivery_enabled
)
1345 switch (sta
->sta
.max_sp
) {
1356 /* XXX: what is a good value? */
1361 ieee80211_sta_ps_deliver_response(sta
, n_frames
, ~delivery_enabled
,
1362 IEEE80211_FRAME_RELEASE_UAPSD
);
1365 void ieee80211_sta_block_awake(struct ieee80211_hw
*hw
,
1366 struct ieee80211_sta
*pubsta
, bool block
)
1368 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
1370 trace_api_sta_block_awake(sta
->local
, pubsta
, block
);
1373 set_sta_flag(sta
, WLAN_STA_PS_DRIVER
);
1374 else if (test_sta_flag(sta
, WLAN_STA_PS_DRIVER
))
1375 ieee80211_queue_work(hw
, &sta
->drv_unblock_wk
);
1377 EXPORT_SYMBOL(ieee80211_sta_block_awake
);
1379 void ieee80211_sta_eosp_irqsafe(struct ieee80211_sta
*pubsta
)
1381 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
1382 struct ieee80211_local
*local
= sta
->local
;
1383 struct sk_buff
*skb
;
1384 struct skb_eosp_msg_data
*data
;
1386 trace_api_eosp(local
, pubsta
);
1388 skb
= alloc_skb(0, GFP_ATOMIC
);
1390 /* too bad ... but race is better than loss */
1391 clear_sta_flag(sta
, WLAN_STA_SP
);
1395 data
= (void *)skb
->cb
;
1396 memcpy(data
->sta
, pubsta
->addr
, ETH_ALEN
);
1397 memcpy(data
->iface
, sta
->sdata
->vif
.addr
, ETH_ALEN
);
1398 skb
->pkt_type
= IEEE80211_EOSP_MSG
;
1399 skb_queue_tail(&local
->skb_queue
, skb
);
1400 tasklet_schedule(&local
->tasklet
);
1402 EXPORT_SYMBOL(ieee80211_sta_eosp_irqsafe
);
1404 void ieee80211_sta_set_buffered(struct ieee80211_sta
*pubsta
,
1405 u8 tid
, bool buffered
)
1407 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
1409 if (WARN_ON(tid
>= IEEE80211_NUM_TIDS
))
1413 set_bit(tid
, &sta
->driver_buffered_tids
);
1415 clear_bit(tid
, &sta
->driver_buffered_tids
);
1417 sta_info_recalc_tim(sta
);
1419 EXPORT_SYMBOL(ieee80211_sta_set_buffered
);
1421 int sta_info_move_state(struct sta_info
*sta
,
1422 enum ieee80211_sta_state new_state
)
1426 if (sta
->sta_state
== new_state
)
1429 /* check allowed transitions first */
1431 switch (new_state
) {
1432 case IEEE80211_STA_NONE
:
1433 if (sta
->sta_state
!= IEEE80211_STA_AUTH
)
1436 case IEEE80211_STA_AUTH
:
1437 if (sta
->sta_state
!= IEEE80211_STA_NONE
&&
1438 sta
->sta_state
!= IEEE80211_STA_ASSOC
)
1441 case IEEE80211_STA_ASSOC
:
1442 if (sta
->sta_state
!= IEEE80211_STA_AUTH
&&
1443 sta
->sta_state
!= IEEE80211_STA_AUTHORIZED
)
1446 case IEEE80211_STA_AUTHORIZED
:
1447 if (sta
->sta_state
!= IEEE80211_STA_ASSOC
)
1451 WARN(1, "invalid state %d", new_state
);
1455 sta_dbg(sta
->sdata
, "moving STA %pM to state %d\n",
1456 sta
->sta
.addr
, new_state
);
1459 * notify the driver before the actual changes so it can
1460 * fail the transition
1462 if (test_sta_flag(sta
, WLAN_STA_INSERTED
)) {
1463 int err
= drv_sta_state(sta
->local
, sta
->sdata
, sta
,
1464 sta
->sta_state
, new_state
);
1469 /* reflect the change in all state variables */
1471 switch (new_state
) {
1472 case IEEE80211_STA_NONE
:
1473 if (sta
->sta_state
== IEEE80211_STA_AUTH
)
1474 clear_bit(WLAN_STA_AUTH
, &sta
->_flags
);
1476 case IEEE80211_STA_AUTH
:
1477 if (sta
->sta_state
== IEEE80211_STA_NONE
)
1478 set_bit(WLAN_STA_AUTH
, &sta
->_flags
);
1479 else if (sta
->sta_state
== IEEE80211_STA_ASSOC
)
1480 clear_bit(WLAN_STA_ASSOC
, &sta
->_flags
);
1482 case IEEE80211_STA_ASSOC
:
1483 if (sta
->sta_state
== IEEE80211_STA_AUTH
) {
1484 set_bit(WLAN_STA_ASSOC
, &sta
->_flags
);
1485 } else if (sta
->sta_state
== IEEE80211_STA_AUTHORIZED
) {
1486 if (sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1487 (sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1488 !sta
->sdata
->u
.vlan
.sta
))
1489 atomic_dec(&sta
->sdata
->bss
->num_mcast_sta
);
1490 clear_bit(WLAN_STA_AUTHORIZED
, &sta
->_flags
);
1493 case IEEE80211_STA_AUTHORIZED
:
1494 if (sta
->sta_state
== IEEE80211_STA_ASSOC
) {
1495 if (sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1496 (sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1497 !sta
->sdata
->u
.vlan
.sta
))
1498 atomic_inc(&sta
->sdata
->bss
->num_mcast_sta
);
1499 set_bit(WLAN_STA_AUTHORIZED
, &sta
->_flags
);
1506 sta
->sta_state
= new_state
;