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 kfree(sta
->ampdu_mlme
.tid_start_tx
[i
]);
153 tid_tx
= rcu_dereference_raw(sta
->ampdu_mlme
.tid_tx
[i
]);
156 ieee80211_purge_tx_queue(&local
->hw
, &tid_tx
->pending
);
160 sta_info_free(local
, sta
);
163 void ieee80211_cleanup_sdata_stas(struct ieee80211_sub_if_data
*sdata
)
165 struct sta_info
*sta
;
167 spin_lock_bh(&sdata
->cleanup_stations_lock
);
168 while (!list_empty(&sdata
->cleanup_stations
)) {
169 sta
= list_first_entry(&sdata
->cleanup_stations
,
170 struct sta_info
, list
);
171 list_del(&sta
->list
);
172 spin_unlock_bh(&sdata
->cleanup_stations_lock
);
174 cleanup_single_sta(sta
);
176 spin_lock_bh(&sdata
->cleanup_stations_lock
);
179 spin_unlock_bh(&sdata
->cleanup_stations_lock
);
182 static void free_sta_rcu(struct rcu_head
*h
)
184 struct sta_info
*sta
= container_of(h
, struct sta_info
, rcu_head
);
185 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
187 spin_lock(&sdata
->cleanup_stations_lock
);
188 list_add_tail(&sta
->list
, &sdata
->cleanup_stations
);
189 spin_unlock(&sdata
->cleanup_stations_lock
);
191 ieee80211_queue_work(&sdata
->local
->hw
, &sdata
->cleanup_stations_wk
);
194 /* protected by RCU */
195 struct sta_info
*sta_info_get(struct ieee80211_sub_if_data
*sdata
,
198 struct ieee80211_local
*local
= sdata
->local
;
199 struct sta_info
*sta
;
201 sta
= rcu_dereference_check(local
->sta_hash
[STA_HASH(addr
)],
202 lockdep_is_held(&local
->sta_mtx
));
204 if (sta
->sdata
== sdata
&&
205 ether_addr_equal(sta
->sta
.addr
, addr
))
207 sta
= rcu_dereference_check(sta
->hnext
,
208 lockdep_is_held(&local
->sta_mtx
));
214 * Get sta info either from the specified interface
215 * or from one of its vlans
217 struct sta_info
*sta_info_get_bss(struct ieee80211_sub_if_data
*sdata
,
220 struct ieee80211_local
*local
= sdata
->local
;
221 struct sta_info
*sta
;
223 sta
= rcu_dereference_check(local
->sta_hash
[STA_HASH(addr
)],
224 lockdep_is_held(&local
->sta_mtx
));
226 if ((sta
->sdata
== sdata
||
227 (sta
->sdata
->bss
&& sta
->sdata
->bss
== sdata
->bss
)) &&
228 ether_addr_equal(sta
->sta
.addr
, addr
))
230 sta
= rcu_dereference_check(sta
->hnext
,
231 lockdep_is_held(&local
->sta_mtx
));
236 struct sta_info
*sta_info_get_by_idx(struct ieee80211_sub_if_data
*sdata
,
239 struct ieee80211_local
*local
= sdata
->local
;
240 struct sta_info
*sta
;
243 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
) {
244 if (sdata
!= sta
->sdata
)
257 * sta_info_free - free STA
259 * @local: pointer to the global information
260 * @sta: STA info to free
262 * This function must undo everything done by sta_info_alloc()
263 * that may happen before sta_info_insert(). It may only be
264 * called when sta_info_insert() has not been attempted (and
265 * if that fails, the station is freed anyway.)
267 void sta_info_free(struct ieee80211_local
*local
, struct sta_info
*sta
)
270 rate_control_free_sta(sta
);
272 sta_dbg(sta
->sdata
, "Destroyed STA %pM\n", sta
->sta
.addr
);
277 /* Caller must hold local->sta_mtx */
278 static void sta_info_hash_add(struct ieee80211_local
*local
,
279 struct sta_info
*sta
)
281 lockdep_assert_held(&local
->sta_mtx
);
282 sta
->hnext
= local
->sta_hash
[STA_HASH(sta
->sta
.addr
)];
283 rcu_assign_pointer(local
->sta_hash
[STA_HASH(sta
->sta
.addr
)], sta
);
286 static void sta_unblock(struct work_struct
*wk
)
288 struct sta_info
*sta
;
290 sta
= container_of(wk
, struct sta_info
, drv_unblock_wk
);
295 if (!test_sta_flag(sta
, WLAN_STA_PS_STA
)) {
297 ieee80211_sta_ps_deliver_wakeup(sta
);
299 } else if (test_and_clear_sta_flag(sta
, WLAN_STA_PSPOLL
)) {
300 clear_sta_flag(sta
, WLAN_STA_PS_DRIVER
);
303 ieee80211_sta_ps_deliver_poll_response(sta
);
305 } else if (test_and_clear_sta_flag(sta
, WLAN_STA_UAPSD
)) {
306 clear_sta_flag(sta
, WLAN_STA_PS_DRIVER
);
309 ieee80211_sta_ps_deliver_uapsd(sta
);
312 clear_sta_flag(sta
, WLAN_STA_PS_DRIVER
);
315 static int sta_prepare_rate_control(struct ieee80211_local
*local
,
316 struct sta_info
*sta
, gfp_t gfp
)
318 if (local
->hw
.flags
& IEEE80211_HW_HAS_RATE_CONTROL
)
321 sta
->rate_ctrl
= local
->rate_ctrl
;
322 sta
->rate_ctrl_priv
= rate_control_alloc_sta(sta
->rate_ctrl
,
324 if (!sta
->rate_ctrl_priv
)
330 struct sta_info
*sta_info_alloc(struct ieee80211_sub_if_data
*sdata
,
331 const u8
*addr
, gfp_t gfp
)
333 struct ieee80211_local
*local
= sdata
->local
;
334 struct sta_info
*sta
;
335 struct timespec uptime
;
338 sta
= kzalloc(sizeof(*sta
) + local
->hw
.sta_data_size
, gfp
);
342 spin_lock_init(&sta
->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);
362 for (i
= 0; i
< ARRAY_SIZE(sta
->chain_signal_avg
); i
++)
363 ewma_init(&sta
->chain_signal_avg
[i
], 1024, 8);
365 if (sta_prepare_rate_control(local
, sta
, gfp
)) {
370 for (i
= 0; i
< IEEE80211_NUM_TIDS
; i
++) {
372 * timer_to_tid must be initialized with identity mapping
373 * to enable session_timer's data differentiation. See
374 * sta_rx_agg_session_timer_expired for usage.
376 sta
->timer_to_tid
[i
] = i
;
378 for (i
= 0; i
< IEEE80211_NUM_ACS
; i
++) {
379 skb_queue_head_init(&sta
->ps_tx_buf
[i
]);
380 skb_queue_head_init(&sta
->tx_filtered
[i
]);
383 for (i
= 0; i
< IEEE80211_NUM_TIDS
; i
++)
384 sta
->last_seq_ctrl
[i
] = cpu_to_le16(USHRT_MAX
);
386 sta
->sta
.smps_mode
= IEEE80211_SMPS_OFF
;
388 sta_dbg(sdata
, "Allocated STA %pM\n", sta
->sta
.addr
);
393 static int sta_info_insert_check(struct sta_info
*sta
)
395 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
398 * Can't be a WARN_ON because it can be triggered through a race:
399 * something inserts a STA (on one CPU) without holding the RTNL
400 * and another CPU turns off the net device.
402 if (unlikely(!ieee80211_sdata_running(sdata
)))
405 if (WARN_ON(ether_addr_equal(sta
->sta
.addr
, sdata
->vif
.addr
) ||
406 is_multicast_ether_addr(sta
->sta
.addr
)))
412 static int sta_info_insert_drv_state(struct ieee80211_local
*local
,
413 struct ieee80211_sub_if_data
*sdata
,
414 struct sta_info
*sta
)
416 enum ieee80211_sta_state state
;
419 for (state
= IEEE80211_STA_NOTEXIST
; state
< sta
->sta_state
; state
++) {
420 err
= drv_sta_state(local
, sdata
, sta
, state
, state
+ 1);
427 * Drivers using legacy sta_add/sta_remove callbacks only
428 * get uploaded set to true after sta_add is called.
430 if (!local
->ops
->sta_add
)
431 sta
->uploaded
= true;
435 if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
437 "failed to move IBSS STA %pM to state %d (%d) - keeping it anyway\n",
438 sta
->sta
.addr
, state
+ 1, err
);
442 /* unwind on error */
443 for (; state
> IEEE80211_STA_NOTEXIST
; state
--)
444 WARN_ON(drv_sta_state(local
, sdata
, sta
, state
, state
- 1));
450 * should be called with sta_mtx locked
451 * this function replaces the mutex lock
454 static int sta_info_insert_finish(struct sta_info
*sta
) __acquires(RCU
)
456 struct ieee80211_local
*local
= sta
->local
;
457 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
458 struct station_info sinfo
;
461 lockdep_assert_held(&local
->sta_mtx
);
463 /* check if STA exists already */
464 if (sta_info_get_bss(sdata
, sta
->sta
.addr
)) {
470 err
= sta_info_insert_drv_state(local
, sdata
, sta
);
475 local
->sta_generation
++;
478 /* make the station visible */
479 sta_info_hash_add(local
, sta
);
481 list_add_rcu(&sta
->list
, &local
->sta_list
);
483 set_sta_flag(sta
, WLAN_STA_INSERTED
);
485 ieee80211_sta_debugfs_add(sta
);
486 rate_control_add_sta_debugfs(sta
);
488 memset(&sinfo
, 0, sizeof(sinfo
));
490 sinfo
.generation
= local
->sta_generation
;
491 cfg80211_new_sta(sdata
->dev
, sta
->sta
.addr
, &sinfo
, GFP_KERNEL
);
493 sta_dbg(sdata
, "Inserted STA %pM\n", sta
->sta
.addr
);
495 /* move reference to rcu-protected */
497 mutex_unlock(&local
->sta_mtx
);
499 if (ieee80211_vif_is_mesh(&sdata
->vif
))
500 mesh_accept_plinks_update(sdata
);
504 mutex_unlock(&local
->sta_mtx
);
509 int sta_info_insert_rcu(struct sta_info
*sta
) __acquires(RCU
)
511 struct ieee80211_local
*local
= sta
->local
;
516 err
= sta_info_insert_check(sta
);
522 mutex_lock(&local
->sta_mtx
);
524 err
= sta_info_insert_finish(sta
);
531 sta_info_free(local
, sta
);
535 int sta_info_insert(struct sta_info
*sta
)
537 int err
= sta_info_insert_rcu(sta
);
544 static inline void __bss_tim_set(u8
*tim
, u16 id
)
547 * This format has been mandated by the IEEE specifications,
548 * so this line may not be changed to use the __set_bit() format.
550 tim
[id
/ 8] |= (1 << (id
% 8));
553 static inline void __bss_tim_clear(u8
*tim
, u16 id
)
556 * This format has been mandated by the IEEE specifications,
557 * so this line may not be changed to use the __clear_bit() format.
559 tim
[id
/ 8] &= ~(1 << (id
% 8));
562 static inline bool __bss_tim_get(u8
*tim
, u16 id
)
565 * This format has been mandated by the IEEE specifications,
566 * so this line may not be changed to use the test_bit() format.
568 return tim
[id
/ 8] & (1 << (id
% 8));
571 static unsigned long ieee80211_tids_for_ac(int ac
)
573 /* If we ever support TIDs > 7, this obviously needs to be adjusted */
575 case IEEE80211_AC_VO
:
576 return BIT(6) | BIT(7);
577 case IEEE80211_AC_VI
:
578 return BIT(4) | BIT(5);
579 case IEEE80211_AC_BE
:
580 return BIT(0) | BIT(3);
581 case IEEE80211_AC_BK
:
582 return BIT(1) | BIT(2);
589 void sta_info_recalc_tim(struct sta_info
*sta
)
591 struct ieee80211_local
*local
= sta
->local
;
593 bool indicate_tim
= false;
594 u8 ignore_for_tim
= sta
->sta
.uapsd_queues
;
598 if (sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
599 sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
) {
600 if (WARN_ON_ONCE(!sta
->sdata
->bss
))
603 ps
= &sta
->sdata
->bss
->ps
;
605 #ifdef CONFIG_MAC80211_MESH
606 } else if (ieee80211_vif_is_mesh(&sta
->sdata
->vif
)) {
607 ps
= &sta
->sdata
->u
.mesh
.ps
;
608 /* TIM map only for PLID <= IEEE80211_MAX_AID */
609 id
= le16_to_cpu(sta
->plid
) % IEEE80211_MAX_AID
;
615 /* No need to do anything if the driver does all */
616 if (local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
)
623 * If all ACs are delivery-enabled then we should build
624 * the TIM bit for all ACs anyway; if only some are then
625 * we ignore those and build the TIM bit using only the
628 if (ignore_for_tim
== BIT(IEEE80211_NUM_ACS
) - 1)
631 for (ac
= 0; ac
< IEEE80211_NUM_ACS
; ac
++) {
634 if (ignore_for_tim
& BIT(ac
))
637 indicate_tim
|= !skb_queue_empty(&sta
->tx_filtered
[ac
]) ||
638 !skb_queue_empty(&sta
->ps_tx_buf
[ac
]);
642 tids
= ieee80211_tids_for_ac(ac
);
645 sta
->driver_buffered_tids
& tids
;
649 spin_lock_bh(&local
->tim_lock
);
651 if (indicate_tim
== __bss_tim_get(ps
->tim
, id
))
655 __bss_tim_set(ps
->tim
, id
);
657 __bss_tim_clear(ps
->tim
, id
);
659 if (local
->ops
->set_tim
) {
660 local
->tim_in_locked_section
= true;
661 drv_set_tim(local
, &sta
->sta
, indicate_tim
);
662 local
->tim_in_locked_section
= false;
666 spin_unlock_bh(&local
->tim_lock
);
669 static bool sta_info_buffer_expired(struct sta_info
*sta
, struct sk_buff
*skb
)
671 struct ieee80211_tx_info
*info
;
677 info
= IEEE80211_SKB_CB(skb
);
679 /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
680 timeout
= (sta
->listen_interval
*
681 sta
->sdata
->vif
.bss_conf
.beacon_int
*
683 if (timeout
< STA_TX_BUFFER_EXPIRE
)
684 timeout
= STA_TX_BUFFER_EXPIRE
;
685 return time_after(jiffies
, info
->control
.jiffies
+ timeout
);
689 static bool sta_info_cleanup_expire_buffered_ac(struct ieee80211_local
*local
,
690 struct sta_info
*sta
, int ac
)
696 * First check for frames that should expire on the filtered
697 * queue. Frames here were rejected by the driver and are on
698 * a separate queue to avoid reordering with normal PS-buffered
699 * frames. They also aren't accounted for right now in the
700 * total_ps_buffered counter.
703 spin_lock_irqsave(&sta
->tx_filtered
[ac
].lock
, flags
);
704 skb
= skb_peek(&sta
->tx_filtered
[ac
]);
705 if (sta_info_buffer_expired(sta
, skb
))
706 skb
= __skb_dequeue(&sta
->tx_filtered
[ac
]);
709 spin_unlock_irqrestore(&sta
->tx_filtered
[ac
].lock
, flags
);
712 * Frames are queued in order, so if this one
713 * hasn't expired yet we can stop testing. If
714 * we actually reached the end of the queue we
715 * also need to stop, of course.
719 ieee80211_free_txskb(&local
->hw
, skb
);
723 * Now also check the normal PS-buffered queue, this will
724 * only find something if the filtered queue was emptied
725 * since the filtered frames are all before the normal PS
729 spin_lock_irqsave(&sta
->ps_tx_buf
[ac
].lock
, flags
);
730 skb
= skb_peek(&sta
->ps_tx_buf
[ac
]);
731 if (sta_info_buffer_expired(sta
, skb
))
732 skb
= __skb_dequeue(&sta
->ps_tx_buf
[ac
]);
735 spin_unlock_irqrestore(&sta
->ps_tx_buf
[ac
].lock
, flags
);
738 * frames are queued in order, so if this one
739 * hasn't expired yet (or we reached the end of
740 * the queue) we can stop testing
745 local
->total_ps_buffered
--;
746 ps_dbg(sta
->sdata
, "Buffered frame expired (STA %pM)\n",
748 ieee80211_free_txskb(&local
->hw
, skb
);
752 * Finally, recalculate the TIM bit for this station -- it might
753 * now be clear because the station was too slow to retrieve its
756 sta_info_recalc_tim(sta
);
759 * Return whether there are any frames still buffered, this is
760 * used to check whether the cleanup timer still needs to run,
761 * if there are no frames we don't need to rearm the timer.
763 return !(skb_queue_empty(&sta
->ps_tx_buf
[ac
]) &&
764 skb_queue_empty(&sta
->tx_filtered
[ac
]));
767 static bool sta_info_cleanup_expire_buffered(struct ieee80211_local
*local
,
768 struct sta_info
*sta
)
770 bool have_buffered
= false;
773 /* This is only necessary for stations on BSS/MBSS interfaces */
774 if (!sta
->sdata
->bss
&&
775 !ieee80211_vif_is_mesh(&sta
->sdata
->vif
))
778 for (ac
= 0; ac
< IEEE80211_NUM_ACS
; ac
++)
780 sta_info_cleanup_expire_buffered_ac(local
, sta
, ac
);
782 return have_buffered
;
785 int __must_check
__sta_info_destroy(struct sta_info
*sta
)
787 struct ieee80211_local
*local
;
788 struct ieee80211_sub_if_data
*sdata
;
799 lockdep_assert_held(&local
->sta_mtx
);
802 * Before removing the station from the driver and
803 * rate control, it might still start new aggregation
804 * sessions -- block that to make sure the tear-down
805 * will be sufficient.
807 set_sta_flag(sta
, WLAN_STA_BLOCK_BA
);
808 ieee80211_sta_tear_down_BA_sessions(sta
, AGG_STOP_DESTROY_STA
);
810 ret
= sta_info_hash_del(local
, sta
);
814 list_del_rcu(&sta
->list
);
816 /* this always calls synchronize_net() */
817 ieee80211_free_sta_keys(local
, sta
);
822 local
->sta_generation
++;
824 if (sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
825 RCU_INIT_POINTER(sdata
->u
.vlan
.sta
, NULL
);
827 while (sta
->sta_state
> IEEE80211_STA_NONE
) {
828 ret
= sta_info_move_state(sta
, sta
->sta_state
- 1);
836 ret
= drv_sta_state(local
, sdata
, sta
, IEEE80211_STA_NONE
,
837 IEEE80211_STA_NOTEXIST
);
838 WARN_ON_ONCE(ret
!= 0);
841 sta_dbg(sdata
, "Removed STA %pM\n", sta
->sta
.addr
);
843 cfg80211_del_sta(sdata
->dev
, sta
->sta
.addr
, GFP_KERNEL
);
845 rate_control_remove_sta_debugfs(sta
);
846 ieee80211_sta_debugfs_remove(sta
);
848 call_rcu(&sta
->rcu_head
, free_sta_rcu
);
853 int sta_info_destroy_addr(struct ieee80211_sub_if_data
*sdata
, const u8
*addr
)
855 struct sta_info
*sta
;
858 mutex_lock(&sdata
->local
->sta_mtx
);
859 sta
= sta_info_get(sdata
, addr
);
860 ret
= __sta_info_destroy(sta
);
861 mutex_unlock(&sdata
->local
->sta_mtx
);
866 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data
*sdata
,
869 struct sta_info
*sta
;
872 mutex_lock(&sdata
->local
->sta_mtx
);
873 sta
= sta_info_get_bss(sdata
, addr
);
874 ret
= __sta_info_destroy(sta
);
875 mutex_unlock(&sdata
->local
->sta_mtx
);
880 static void sta_info_cleanup(unsigned long data
)
882 struct ieee80211_local
*local
= (struct ieee80211_local
*) data
;
883 struct sta_info
*sta
;
884 bool timer_needed
= false;
887 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
)
888 if (sta_info_cleanup_expire_buffered(local
, sta
))
892 if (local
->quiescing
)
898 mod_timer(&local
->sta_cleanup
,
899 round_jiffies(jiffies
+ STA_INFO_CLEANUP_INTERVAL
));
902 void sta_info_init(struct ieee80211_local
*local
)
904 spin_lock_init(&local
->tim_lock
);
905 mutex_init(&local
->sta_mtx
);
906 INIT_LIST_HEAD(&local
->sta_list
);
908 setup_timer(&local
->sta_cleanup
, sta_info_cleanup
,
909 (unsigned long)local
);
912 void sta_info_stop(struct ieee80211_local
*local
)
914 del_timer_sync(&local
->sta_cleanup
);
918 int sta_info_flush_defer(struct ieee80211_sub_if_data
*sdata
)
920 struct ieee80211_local
*local
= sdata
->local
;
921 struct sta_info
*sta
, *tmp
;
926 mutex_lock(&local
->sta_mtx
);
927 list_for_each_entry_safe(sta
, tmp
, &local
->sta_list
, list
) {
928 if (sdata
== sta
->sdata
) {
929 WARN_ON(__sta_info_destroy(sta
));
933 mutex_unlock(&local
->sta_mtx
);
938 void sta_info_flush_cleanup(struct ieee80211_sub_if_data
*sdata
)
940 ieee80211_cleanup_sdata_stas(sdata
);
941 cancel_work_sync(&sdata
->cleanup_stations_wk
);
944 void ieee80211_sta_expire(struct ieee80211_sub_if_data
*sdata
,
945 unsigned long exp_time
)
947 struct ieee80211_local
*local
= sdata
->local
;
948 struct sta_info
*sta
, *tmp
;
950 mutex_lock(&local
->sta_mtx
);
952 list_for_each_entry_safe(sta
, tmp
, &local
->sta_list
, list
) {
953 if (sdata
!= sta
->sdata
)
956 if (time_after(jiffies
, sta
->last_rx
+ exp_time
)) {
957 sta_dbg(sta
->sdata
, "expiring inactive STA %pM\n",
960 if (ieee80211_vif_is_mesh(&sdata
->vif
) &&
961 test_sta_flag(sta
, WLAN_STA_PS_STA
))
962 atomic_dec(&sdata
->u
.mesh
.ps
.num_sta_ps
);
964 WARN_ON(__sta_info_destroy(sta
));
968 mutex_unlock(&local
->sta_mtx
);
971 struct ieee80211_sta
*ieee80211_find_sta_by_ifaddr(struct ieee80211_hw
*hw
,
975 struct sta_info
*sta
, *nxt
;
978 * Just return a random station if localaddr is NULL
981 for_each_sta_info(hw_to_local(hw
), addr
, sta
, nxt
) {
983 !ether_addr_equal(sta
->sdata
->vif
.addr
, localaddr
))
992 EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr
);
994 struct ieee80211_sta
*ieee80211_find_sta(struct ieee80211_vif
*vif
,
997 struct sta_info
*sta
;
1002 sta
= sta_info_get_bss(vif_to_sdata(vif
), addr
);
1011 EXPORT_SYMBOL(ieee80211_find_sta
);
1013 static void clear_sta_ps_flags(void *_sta
)
1015 struct sta_info
*sta
= _sta
;
1016 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
1019 if (sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1020 sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
1021 ps
= &sdata
->bss
->ps
;
1022 else if (ieee80211_vif_is_mesh(&sdata
->vif
))
1023 ps
= &sdata
->u
.mesh
.ps
;
1027 clear_sta_flag(sta
, WLAN_STA_PS_DRIVER
);
1028 if (test_and_clear_sta_flag(sta
, WLAN_STA_PS_STA
))
1029 atomic_dec(&ps
->num_sta_ps
);
1032 /* powersave support code */
1033 void ieee80211_sta_ps_deliver_wakeup(struct sta_info
*sta
)
1035 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
1036 struct ieee80211_local
*local
= sdata
->local
;
1037 struct sk_buff_head pending
;
1038 int filtered
= 0, buffered
= 0, ac
;
1039 unsigned long flags
;
1041 clear_sta_flag(sta
, WLAN_STA_SP
);
1043 BUILD_BUG_ON(BITS_TO_LONGS(IEEE80211_NUM_TIDS
) > 1);
1044 sta
->driver_buffered_tids
= 0;
1046 if (!(local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
))
1047 drv_sta_notify(local
, sdata
, STA_NOTIFY_AWAKE
, &sta
->sta
);
1049 skb_queue_head_init(&pending
);
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
);
1071 local
->total_ps_buffered
-= buffered
;
1073 sta_info_recalc_tim(sta
);
1076 "STA %pM aid %d sending %d filtered/%d PS frames since STA not sleeping anymore\n",
1077 sta
->sta
.addr
, sta
->sta
.aid
, filtered
, buffered
);
1080 static void ieee80211_send_null_response(struct ieee80211_sub_if_data
*sdata
,
1081 struct sta_info
*sta
, int tid
,
1082 enum ieee80211_frame_release_type reason
)
1084 struct ieee80211_local
*local
= sdata
->local
;
1085 struct ieee80211_qos_hdr
*nullfunc
;
1086 struct sk_buff
*skb
;
1087 int size
= sizeof(*nullfunc
);
1089 bool qos
= test_sta_flag(sta
, WLAN_STA_WME
);
1090 struct ieee80211_tx_info
*info
;
1091 struct ieee80211_chanctx_conf
*chanctx_conf
;
1094 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
|
1095 IEEE80211_STYPE_QOS_NULLFUNC
|
1096 IEEE80211_FCTL_FROMDS
);
1099 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
|
1100 IEEE80211_STYPE_NULLFUNC
|
1101 IEEE80211_FCTL_FROMDS
);
1104 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ size
);
1108 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
1110 nullfunc
= (void *) skb_put(skb
, size
);
1111 nullfunc
->frame_control
= fc
;
1112 nullfunc
->duration_id
= 0;
1113 memcpy(nullfunc
->addr1
, sta
->sta
.addr
, ETH_ALEN
);
1114 memcpy(nullfunc
->addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1115 memcpy(nullfunc
->addr3
, sdata
->vif
.addr
, ETH_ALEN
);
1117 skb
->priority
= tid
;
1118 skb_set_queue_mapping(skb
, ieee802_1d_to_ac
[tid
]);
1120 nullfunc
->qos_ctrl
= cpu_to_le16(tid
);
1122 if (reason
== IEEE80211_FRAME_RELEASE_UAPSD
)
1123 nullfunc
->qos_ctrl
|=
1124 cpu_to_le16(IEEE80211_QOS_CTL_EOSP
);
1127 info
= IEEE80211_SKB_CB(skb
);
1130 * Tell TX path to send this frame even though the
1131 * STA may still remain is PS mode after this frame
1132 * exchange. Also set EOSP to indicate this packet
1133 * ends the poll/service period.
1135 info
->flags
|= IEEE80211_TX_CTL_NO_PS_BUFFER
|
1136 IEEE80211_TX_CTL_PS_RESPONSE
|
1137 IEEE80211_TX_STATUS_EOSP
|
1138 IEEE80211_TX_CTL_REQ_TX_STATUS
;
1140 drv_allow_buffered_frames(local
, sta
, BIT(tid
), 1, reason
, false);
1142 skb
->dev
= sdata
->dev
;
1145 chanctx_conf
= rcu_dereference(sdata
->vif
.chanctx_conf
);
1146 if (WARN_ON(!chanctx_conf
)) {
1152 ieee80211_xmit(sdata
, skb
, chanctx_conf
->def
.chan
->band
);
1157 ieee80211_sta_ps_deliver_response(struct sta_info
*sta
,
1158 int n_frames
, u8 ignored_acs
,
1159 enum ieee80211_frame_release_type reason
)
1161 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
1162 struct ieee80211_local
*local
= sdata
->local
;
1164 bool more_data
= false;
1166 unsigned long driver_release_tids
= 0;
1167 struct sk_buff_head frames
;
1169 /* Service or PS-Poll period starts */
1170 set_sta_flag(sta
, WLAN_STA_SP
);
1172 __skb_queue_head_init(&frames
);
1175 * Get response frame(s) and more data bit for it.
1177 for (ac
= 0; ac
< IEEE80211_NUM_ACS
; ac
++) {
1180 if (ignored_acs
& BIT(ac
))
1183 tids
= ieee80211_tids_for_ac(ac
);
1186 driver_release_tids
= sta
->driver_buffered_tids
& tids
;
1187 if (driver_release_tids
) {
1190 struct sk_buff
*skb
;
1192 while (n_frames
> 0) {
1193 skb
= skb_dequeue(&sta
->tx_filtered
[ac
]);
1196 &sta
->ps_tx_buf
[ac
]);
1198 local
->total_ps_buffered
--;
1204 __skb_queue_tail(&frames
, skb
);
1209 * If the driver has data on more than one TID then
1210 * certainly there's more data if we release just a
1211 * single frame now (from a single TID).
1213 if (reason
== IEEE80211_FRAME_RELEASE_PSPOLL
&&
1214 hweight16(driver_release_tids
) > 1) {
1216 driver_release_tids
=
1217 BIT(ffs(driver_release_tids
) - 1);
1222 if (!skb_queue_empty(&sta
->tx_filtered
[ac
]) ||
1223 !skb_queue_empty(&sta
->ps_tx_buf
[ac
])) {
1233 * For PS-Poll, this can only happen due to a race condition
1234 * when we set the TIM bit and the station notices it, but
1235 * before it can poll for the frame we expire it.
1237 * For uAPSD, this is said in the standard (11.2.1.5 h):
1238 * At each unscheduled SP for a non-AP STA, the AP shall
1239 * attempt to transmit at least one MSDU or MMPDU, but no
1240 * more than the value specified in the Max SP Length field
1241 * in the QoS Capability element from delivery-enabled ACs,
1242 * that are destined for the non-AP STA.
1244 * Since we have no other MSDU/MMPDU, transmit a QoS null frame.
1247 /* This will evaluate to 1, 3, 5 or 7. */
1248 tid
= 7 - ((ffs(~ignored_acs
) - 1) << 1);
1250 ieee80211_send_null_response(sdata
, sta
, tid
, reason
);
1254 if (!driver_release_tids
) {
1255 struct sk_buff_head pending
;
1256 struct sk_buff
*skb
;
1260 skb_queue_head_init(&pending
);
1262 while ((skb
= __skb_dequeue(&frames
))) {
1263 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1264 struct ieee80211_hdr
*hdr
= (void *) skb
->data
;
1270 * Tell TX path to send this frame even though the
1271 * STA may still remain is PS mode after this frame
1274 info
->flags
|= IEEE80211_TX_CTL_NO_PS_BUFFER
|
1275 IEEE80211_TX_CTL_PS_RESPONSE
;
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
;