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 /* protected by RCU */
95 struct sta_info
*sta_info_get(struct ieee80211_sub_if_data
*sdata
,
98 struct ieee80211_local
*local
= sdata
->local
;
101 sta
= rcu_dereference_check(local
->sta_hash
[STA_HASH(addr
)],
102 lockdep_is_held(&local
->sta_mtx
));
104 if (sta
->sdata
== sdata
&&
105 ether_addr_equal(sta
->sta
.addr
, addr
))
107 sta
= rcu_dereference_check(sta
->hnext
,
108 lockdep_is_held(&local
->sta_mtx
));
114 * Get sta info either from the specified interface
115 * or from one of its vlans
117 struct sta_info
*sta_info_get_bss(struct ieee80211_sub_if_data
*sdata
,
120 struct ieee80211_local
*local
= sdata
->local
;
121 struct sta_info
*sta
;
123 sta
= rcu_dereference_check(local
->sta_hash
[STA_HASH(addr
)],
124 lockdep_is_held(&local
->sta_mtx
));
126 if ((sta
->sdata
== sdata
||
127 (sta
->sdata
->bss
&& sta
->sdata
->bss
== sdata
->bss
)) &&
128 ether_addr_equal(sta
->sta
.addr
, addr
))
130 sta
= rcu_dereference_check(sta
->hnext
,
131 lockdep_is_held(&local
->sta_mtx
));
136 struct sta_info
*sta_info_get_by_idx(struct ieee80211_sub_if_data
*sdata
,
139 struct ieee80211_local
*local
= sdata
->local
;
140 struct sta_info
*sta
;
143 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
) {
144 if (sdata
!= sta
->sdata
)
157 * sta_info_free - free STA
159 * @local: pointer to the global information
160 * @sta: STA info to free
162 * This function must undo everything done by sta_info_alloc()
163 * that may happen before sta_info_insert(). It may only be
164 * called when sta_info_insert() has not been attempted (and
165 * if that fails, the station is freed anyway.)
167 void sta_info_free(struct ieee80211_local
*local
, struct sta_info
*sta
)
170 rate_control_free_sta(sta
);
172 sta_dbg(sta
->sdata
, "Destroyed STA %pM\n", sta
->sta
.addr
);
177 /* Caller must hold local->sta_mtx */
178 static void sta_info_hash_add(struct ieee80211_local
*local
,
179 struct sta_info
*sta
)
181 lockdep_assert_held(&local
->sta_mtx
);
182 sta
->hnext
= local
->sta_hash
[STA_HASH(sta
->sta
.addr
)];
183 rcu_assign_pointer(local
->sta_hash
[STA_HASH(sta
->sta
.addr
)], sta
);
186 static void sta_unblock(struct work_struct
*wk
)
188 struct sta_info
*sta
;
190 sta
= container_of(wk
, struct sta_info
, drv_unblock_wk
);
195 if (!test_sta_flag(sta
, WLAN_STA_PS_STA
)) {
197 ieee80211_sta_ps_deliver_wakeup(sta
);
199 } else if (test_and_clear_sta_flag(sta
, WLAN_STA_PSPOLL
)) {
200 clear_sta_flag(sta
, WLAN_STA_PS_DRIVER
);
203 ieee80211_sta_ps_deliver_poll_response(sta
);
205 } else if (test_and_clear_sta_flag(sta
, WLAN_STA_UAPSD
)) {
206 clear_sta_flag(sta
, WLAN_STA_PS_DRIVER
);
209 ieee80211_sta_ps_deliver_uapsd(sta
);
212 clear_sta_flag(sta
, WLAN_STA_PS_DRIVER
);
215 static int sta_prepare_rate_control(struct ieee80211_local
*local
,
216 struct sta_info
*sta
, gfp_t gfp
)
218 if (local
->hw
.flags
& IEEE80211_HW_HAS_RATE_CONTROL
)
221 sta
->rate_ctrl
= local
->rate_ctrl
;
222 sta
->rate_ctrl_priv
= rate_control_alloc_sta(sta
->rate_ctrl
,
224 if (!sta
->rate_ctrl_priv
)
230 struct sta_info
*sta_info_alloc(struct ieee80211_sub_if_data
*sdata
,
231 const u8
*addr
, gfp_t gfp
)
233 struct ieee80211_local
*local
= sdata
->local
;
234 struct sta_info
*sta
;
235 struct timespec uptime
;
238 sta
= kzalloc(sizeof(*sta
) + local
->hw
.sta_data_size
, gfp
);
242 spin_lock_init(&sta
->lock
);
243 INIT_WORK(&sta
->drv_unblock_wk
, sta_unblock
);
244 INIT_WORK(&sta
->ampdu_mlme
.work
, ieee80211_ba_session_work
);
245 mutex_init(&sta
->ampdu_mlme
.mtx
);
247 memcpy(sta
->sta
.addr
, addr
, ETH_ALEN
);
250 sta
->last_rx
= jiffies
;
252 sta
->sta_state
= IEEE80211_STA_NONE
;
254 do_posix_clock_monotonic_gettime(&uptime
);
255 sta
->last_connected
= uptime
.tv_sec
;
256 ewma_init(&sta
->avg_signal
, 1024, 8);
258 if (sta_prepare_rate_control(local
, sta
, gfp
)) {
263 for (i
= 0; i
< STA_TID_NUM
; i
++) {
265 * timer_to_tid must be initialized with identity mapping
266 * to enable session_timer's data differentiation. See
267 * sta_rx_agg_session_timer_expired for usage.
269 sta
->timer_to_tid
[i
] = i
;
271 for (i
= 0; i
< IEEE80211_NUM_ACS
; i
++) {
272 skb_queue_head_init(&sta
->ps_tx_buf
[i
]);
273 skb_queue_head_init(&sta
->tx_filtered
[i
]);
276 for (i
= 0; i
< NUM_RX_DATA_QUEUES
; i
++)
277 sta
->last_seq_ctrl
[i
] = cpu_to_le16(USHRT_MAX
);
279 sta_dbg(sdata
, "Allocated STA %pM\n", sta
->sta
.addr
);
281 #ifdef CONFIG_MAC80211_MESH
282 sta
->plink_state
= NL80211_PLINK_LISTEN
;
283 init_timer(&sta
->plink_timer
);
289 static int sta_info_insert_check(struct sta_info
*sta
)
291 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
294 * Can't be a WARN_ON because it can be triggered through a race:
295 * something inserts a STA (on one CPU) without holding the RTNL
296 * and another CPU turns off the net device.
298 if (unlikely(!ieee80211_sdata_running(sdata
)))
301 if (WARN_ON(ether_addr_equal(sta
->sta
.addr
, sdata
->vif
.addr
) ||
302 is_multicast_ether_addr(sta
->sta
.addr
)))
308 static int sta_info_insert_drv_state(struct ieee80211_local
*local
,
309 struct ieee80211_sub_if_data
*sdata
,
310 struct sta_info
*sta
)
312 enum ieee80211_sta_state state
;
315 for (state
= IEEE80211_STA_NOTEXIST
; state
< sta
->sta_state
; state
++) {
316 err
= drv_sta_state(local
, sdata
, sta
, state
, state
+ 1);
323 * Drivers using legacy sta_add/sta_remove callbacks only
324 * get uploaded set to true after sta_add is called.
326 if (!local
->ops
->sta_add
)
327 sta
->uploaded
= true;
331 if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
333 "failed to move IBSS STA %pM to state %d (%d) - keeping it anyway\n",
334 sta
->sta
.addr
, state
+ 1, err
);
338 /* unwind on error */
339 for (; state
> IEEE80211_STA_NOTEXIST
; state
--)
340 WARN_ON(drv_sta_state(local
, sdata
, sta
, state
, state
- 1));
346 * should be called with sta_mtx locked
347 * this function replaces the mutex lock
350 static int sta_info_insert_finish(struct sta_info
*sta
) __acquires(RCU
)
352 struct ieee80211_local
*local
= sta
->local
;
353 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
354 struct station_info sinfo
;
357 lockdep_assert_held(&local
->sta_mtx
);
359 /* check if STA exists already */
360 if (sta_info_get_bss(sdata
, sta
->sta
.addr
)) {
366 err
= sta_info_insert_drv_state(local
, sdata
, sta
);
371 local
->sta_generation
++;
374 /* make the station visible */
375 sta_info_hash_add(local
, sta
);
377 list_add_rcu(&sta
->list
, &local
->sta_list
);
379 set_sta_flag(sta
, WLAN_STA_INSERTED
);
381 ieee80211_sta_debugfs_add(sta
);
382 rate_control_add_sta_debugfs(sta
);
384 memset(&sinfo
, 0, sizeof(sinfo
));
386 sinfo
.generation
= local
->sta_generation
;
387 cfg80211_new_sta(sdata
->dev
, sta
->sta
.addr
, &sinfo
, GFP_KERNEL
);
389 sta_dbg(sdata
, "Inserted STA %pM\n", sta
->sta
.addr
);
391 /* move reference to rcu-protected */
393 mutex_unlock(&local
->sta_mtx
);
395 if (ieee80211_vif_is_mesh(&sdata
->vif
))
396 mesh_accept_plinks_update(sdata
);
400 mutex_unlock(&local
->sta_mtx
);
405 int sta_info_insert_rcu(struct sta_info
*sta
) __acquires(RCU
)
407 struct ieee80211_local
*local
= sta
->local
;
412 err
= sta_info_insert_check(sta
);
418 mutex_lock(&local
->sta_mtx
);
420 err
= sta_info_insert_finish(sta
);
427 sta_info_free(local
, sta
);
431 int sta_info_insert(struct sta_info
*sta
)
433 int err
= sta_info_insert_rcu(sta
);
440 static inline void __bss_tim_set(struct ieee80211_if_ap
*bss
, u16 aid
)
443 * This format has been mandated by the IEEE specifications,
444 * so this line may not be changed to use the __set_bit() format.
446 bss
->tim
[aid
/ 8] |= (1 << (aid
% 8));
449 static inline void __bss_tim_clear(struct ieee80211_if_ap
*bss
, u16 aid
)
452 * This format has been mandated by the IEEE specifications,
453 * so this line may not be changed to use the __clear_bit() format.
455 bss
->tim
[aid
/ 8] &= ~(1 << (aid
% 8));
458 static unsigned long ieee80211_tids_for_ac(int ac
)
460 /* If we ever support TIDs > 7, this obviously needs to be adjusted */
462 case IEEE80211_AC_VO
:
463 return BIT(6) | BIT(7);
464 case IEEE80211_AC_VI
:
465 return BIT(4) | BIT(5);
466 case IEEE80211_AC_BE
:
467 return BIT(0) | BIT(3);
468 case IEEE80211_AC_BK
:
469 return BIT(1) | BIT(2);
476 void sta_info_recalc_tim(struct sta_info
*sta
)
478 struct ieee80211_local
*local
= sta
->local
;
479 struct ieee80211_if_ap
*bss
= sta
->sdata
->bss
;
481 bool indicate_tim
= false;
482 u8 ignore_for_tim
= sta
->sta
.uapsd_queues
;
485 if (WARN_ON_ONCE(!sta
->sdata
->bss
))
488 /* No need to do anything if the driver does all */
489 if (local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
)
496 * If all ACs are delivery-enabled then we should build
497 * the TIM bit for all ACs anyway; if only some are then
498 * we ignore those and build the TIM bit using only the
501 if (ignore_for_tim
== BIT(IEEE80211_NUM_ACS
) - 1)
504 for (ac
= 0; ac
< IEEE80211_NUM_ACS
; ac
++) {
507 if (ignore_for_tim
& BIT(ac
))
510 indicate_tim
|= !skb_queue_empty(&sta
->tx_filtered
[ac
]) ||
511 !skb_queue_empty(&sta
->ps_tx_buf
[ac
]);
515 tids
= ieee80211_tids_for_ac(ac
);
518 sta
->driver_buffered_tids
& tids
;
522 spin_lock_irqsave(&local
->tim_lock
, flags
);
525 __bss_tim_set(bss
, sta
->sta
.aid
);
527 __bss_tim_clear(bss
, sta
->sta
.aid
);
529 if (local
->ops
->set_tim
) {
530 local
->tim_in_locked_section
= true;
531 drv_set_tim(local
, &sta
->sta
, indicate_tim
);
532 local
->tim_in_locked_section
= false;
535 spin_unlock_irqrestore(&local
->tim_lock
, flags
);
538 static bool sta_info_buffer_expired(struct sta_info
*sta
, struct sk_buff
*skb
)
540 struct ieee80211_tx_info
*info
;
546 info
= IEEE80211_SKB_CB(skb
);
548 /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
549 timeout
= (sta
->listen_interval
*
550 sta
->sdata
->vif
.bss_conf
.beacon_int
*
552 if (timeout
< STA_TX_BUFFER_EXPIRE
)
553 timeout
= STA_TX_BUFFER_EXPIRE
;
554 return time_after(jiffies
, info
->control
.jiffies
+ timeout
);
558 static bool sta_info_cleanup_expire_buffered_ac(struct ieee80211_local
*local
,
559 struct sta_info
*sta
, int ac
)
565 * First check for frames that should expire on the filtered
566 * queue. Frames here were rejected by the driver and are on
567 * a separate queue to avoid reordering with normal PS-buffered
568 * frames. They also aren't accounted for right now in the
569 * total_ps_buffered counter.
572 spin_lock_irqsave(&sta
->tx_filtered
[ac
].lock
, flags
);
573 skb
= skb_peek(&sta
->tx_filtered
[ac
]);
574 if (sta_info_buffer_expired(sta
, skb
))
575 skb
= __skb_dequeue(&sta
->tx_filtered
[ac
]);
578 spin_unlock_irqrestore(&sta
->tx_filtered
[ac
].lock
, flags
);
581 * Frames are queued in order, so if this one
582 * hasn't expired yet we can stop testing. If
583 * we actually reached the end of the queue we
584 * also need to stop, of course.
592 * Now also check the normal PS-buffered queue, this will
593 * only find something if the filtered queue was emptied
594 * since the filtered frames are all before the normal PS
598 spin_lock_irqsave(&sta
->ps_tx_buf
[ac
].lock
, flags
);
599 skb
= skb_peek(&sta
->ps_tx_buf
[ac
]);
600 if (sta_info_buffer_expired(sta
, skb
))
601 skb
= __skb_dequeue(&sta
->ps_tx_buf
[ac
]);
604 spin_unlock_irqrestore(&sta
->ps_tx_buf
[ac
].lock
, flags
);
607 * frames are queued in order, so if this one
608 * hasn't expired yet (or we reached the end of
609 * the queue) we can stop testing
614 local
->total_ps_buffered
--;
615 ps_dbg(sta
->sdata
, "Buffered frame expired (STA %pM)\n",
621 * Finally, recalculate the TIM bit for this station -- it might
622 * now be clear because the station was too slow to retrieve its
625 sta_info_recalc_tim(sta
);
628 * Return whether there are any frames still buffered, this is
629 * used to check whether the cleanup timer still needs to run,
630 * if there are no frames we don't need to rearm the timer.
632 return !(skb_queue_empty(&sta
->ps_tx_buf
[ac
]) &&
633 skb_queue_empty(&sta
->tx_filtered
[ac
]));
636 static bool sta_info_cleanup_expire_buffered(struct ieee80211_local
*local
,
637 struct sta_info
*sta
)
639 bool have_buffered
= false;
642 /* This is only necessary for stations on BSS interfaces */
643 if (!sta
->sdata
->bss
)
646 for (ac
= 0; ac
< IEEE80211_NUM_ACS
; ac
++)
648 sta_info_cleanup_expire_buffered_ac(local
, sta
, ac
);
650 return have_buffered
;
653 int __must_check
__sta_info_destroy(struct sta_info
*sta
)
655 struct ieee80211_local
*local
;
656 struct ieee80211_sub_if_data
*sdata
;
658 struct tid_ampdu_tx
*tid_tx
;
668 lockdep_assert_held(&local
->sta_mtx
);
671 * Before removing the station from the driver and
672 * rate control, it might still start new aggregation
673 * sessions -- block that to make sure the tear-down
674 * will be sufficient.
676 set_sta_flag(sta
, WLAN_STA_BLOCK_BA
);
677 ieee80211_sta_tear_down_BA_sessions(sta
, true);
679 ret
= sta_info_hash_del(local
, sta
);
683 list_del_rcu(&sta
->list
);
685 mutex_lock(&local
->key_mtx
);
686 for (i
= 0; i
< NUM_DEFAULT_KEYS
; i
++)
687 __ieee80211_key_free(key_mtx_dereference(local
, sta
->gtk
[i
]));
689 __ieee80211_key_free(key_mtx_dereference(local
, sta
->ptk
));
690 mutex_unlock(&local
->key_mtx
);
695 local
->sta_generation
++;
697 if (sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
698 RCU_INIT_POINTER(sdata
->u
.vlan
.sta
, NULL
);
700 while (sta
->sta_state
> IEEE80211_STA_NONE
) {
701 ret
= sta_info_move_state(sta
, sta
->sta_state
- 1);
709 ret
= drv_sta_state(local
, sdata
, sta
, IEEE80211_STA_NONE
,
710 IEEE80211_STA_NOTEXIST
);
711 WARN_ON_ONCE(ret
!= 0);
715 * At this point, after we wait for an RCU grace period,
716 * neither mac80211 nor the driver can reference this
717 * sta struct any more except by still existing timers
718 * associated with this station that we clean up below.
722 if (test_sta_flag(sta
, WLAN_STA_PS_STA
)) {
725 clear_sta_flag(sta
, WLAN_STA_PS_STA
);
727 atomic_dec(&sdata
->bss
->num_sta_ps
);
728 sta_info_recalc_tim(sta
);
731 for (ac
= 0; ac
< IEEE80211_NUM_ACS
; ac
++) {
732 local
->total_ps_buffered
-= skb_queue_len(&sta
->ps_tx_buf
[ac
]);
733 __skb_queue_purge(&sta
->ps_tx_buf
[ac
]);
734 __skb_queue_purge(&sta
->tx_filtered
[ac
]);
737 #ifdef CONFIG_MAC80211_MESH
738 if (ieee80211_vif_is_mesh(&sdata
->vif
))
739 mesh_accept_plinks_update(sdata
);
742 sta_dbg(sdata
, "Removed STA %pM\n", sta
->sta
.addr
);
744 cancel_work_sync(&sta
->drv_unblock_wk
);
746 cfg80211_del_sta(sdata
->dev
, sta
->sta
.addr
, GFP_KERNEL
);
748 rate_control_remove_sta_debugfs(sta
);
749 ieee80211_sta_debugfs_remove(sta
);
751 #ifdef CONFIG_MAC80211_MESH
752 if (ieee80211_vif_is_mesh(&sta
->sdata
->vif
)) {
753 mesh_plink_deactivate(sta
);
754 del_timer_sync(&sta
->plink_timer
);
759 * Destroy aggregation state here. It would be nice to wait for the
760 * driver to finish aggregation stop and then clean up, but for now
761 * drivers have to handle aggregation stop being requested, followed
762 * directly by station destruction.
764 for (i
= 0; i
< STA_TID_NUM
; i
++) {
765 tid_tx
= rcu_dereference_raw(sta
->ampdu_mlme
.tid_tx
[i
]);
768 __skb_queue_purge(&tid_tx
->pending
);
772 sta_info_free(local
, sta
);
777 int sta_info_destroy_addr(struct ieee80211_sub_if_data
*sdata
, const u8
*addr
)
779 struct sta_info
*sta
;
782 mutex_lock(&sdata
->local
->sta_mtx
);
783 sta
= sta_info_get(sdata
, addr
);
784 ret
= __sta_info_destroy(sta
);
785 mutex_unlock(&sdata
->local
->sta_mtx
);
790 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data
*sdata
,
793 struct sta_info
*sta
;
796 mutex_lock(&sdata
->local
->sta_mtx
);
797 sta
= sta_info_get_bss(sdata
, addr
);
798 ret
= __sta_info_destroy(sta
);
799 mutex_unlock(&sdata
->local
->sta_mtx
);
804 static void sta_info_cleanup(unsigned long data
)
806 struct ieee80211_local
*local
= (struct ieee80211_local
*) data
;
807 struct sta_info
*sta
;
808 bool timer_needed
= false;
811 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
)
812 if (sta_info_cleanup_expire_buffered(local
, sta
))
816 if (local
->quiescing
)
822 mod_timer(&local
->sta_cleanup
,
823 round_jiffies(jiffies
+ STA_INFO_CLEANUP_INTERVAL
));
826 void sta_info_init(struct ieee80211_local
*local
)
828 spin_lock_init(&local
->tim_lock
);
829 mutex_init(&local
->sta_mtx
);
830 INIT_LIST_HEAD(&local
->sta_list
);
832 setup_timer(&local
->sta_cleanup
, sta_info_cleanup
,
833 (unsigned long)local
);
836 void sta_info_stop(struct ieee80211_local
*local
)
838 del_timer(&local
->sta_cleanup
);
839 sta_info_flush(local
, NULL
);
843 * sta_info_flush - flush matching STA entries from the STA table
845 * Returns the number of removed STA entries.
847 * @local: local interface data
848 * @sdata: matching rule for the net device (sta->dev) or %NULL to match all STAs
850 int sta_info_flush(struct ieee80211_local
*local
,
851 struct ieee80211_sub_if_data
*sdata
)
853 struct sta_info
*sta
, *tmp
;
858 mutex_lock(&local
->sta_mtx
);
859 list_for_each_entry_safe(sta
, tmp
, &local
->sta_list
, list
) {
860 if (!sdata
|| sdata
== sta
->sdata
) {
861 WARN_ON(__sta_info_destroy(sta
));
865 mutex_unlock(&local
->sta_mtx
);
870 void ieee80211_sta_expire(struct ieee80211_sub_if_data
*sdata
,
871 unsigned long exp_time
)
873 struct ieee80211_local
*local
= sdata
->local
;
874 struct sta_info
*sta
, *tmp
;
876 mutex_lock(&local
->sta_mtx
);
878 list_for_each_entry_safe(sta
, tmp
, &local
->sta_list
, list
) {
879 if (sdata
!= sta
->sdata
)
882 if (time_after(jiffies
, sta
->last_rx
+ exp_time
)) {
883 ibss_dbg(sdata
, "expiring inactive STA %pM\n",
885 WARN_ON(__sta_info_destroy(sta
));
889 mutex_unlock(&local
->sta_mtx
);
892 struct ieee80211_sta
*ieee80211_find_sta_by_ifaddr(struct ieee80211_hw
*hw
,
896 struct sta_info
*sta
, *nxt
;
899 * Just return a random station if localaddr is NULL
902 for_each_sta_info(hw_to_local(hw
), addr
, sta
, nxt
) {
904 !ether_addr_equal(sta
->sdata
->vif
.addr
, localaddr
))
913 EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr
);
915 struct ieee80211_sta
*ieee80211_find_sta(struct ieee80211_vif
*vif
,
918 struct sta_info
*sta
;
923 sta
= sta_info_get_bss(vif_to_sdata(vif
), addr
);
932 EXPORT_SYMBOL(ieee80211_find_sta
);
934 static void clear_sta_ps_flags(void *_sta
)
936 struct sta_info
*sta
= _sta
;
937 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
939 clear_sta_flag(sta
, WLAN_STA_PS_DRIVER
);
940 if (test_and_clear_sta_flag(sta
, WLAN_STA_PS_STA
))
941 atomic_dec(&sdata
->bss
->num_sta_ps
);
944 /* powersave support code */
945 void ieee80211_sta_ps_deliver_wakeup(struct sta_info
*sta
)
947 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
948 struct ieee80211_local
*local
= sdata
->local
;
949 struct sk_buff_head pending
;
950 int filtered
= 0, buffered
= 0, ac
;
952 clear_sta_flag(sta
, WLAN_STA_SP
);
954 BUILD_BUG_ON(BITS_TO_LONGS(STA_TID_NUM
) > 1);
955 sta
->driver_buffered_tids
= 0;
957 if (!(local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
))
958 drv_sta_notify(local
, sdata
, STA_NOTIFY_AWAKE
, &sta
->sta
);
960 skb_queue_head_init(&pending
);
962 /* Send all buffered frames to the station */
963 for (ac
= 0; ac
< IEEE80211_NUM_ACS
; ac
++) {
964 int count
= skb_queue_len(&pending
), tmp
;
966 skb_queue_splice_tail_init(&sta
->tx_filtered
[ac
], &pending
);
967 tmp
= skb_queue_len(&pending
);
968 filtered
+= tmp
- count
;
971 skb_queue_splice_tail_init(&sta
->ps_tx_buf
[ac
], &pending
);
972 tmp
= skb_queue_len(&pending
);
973 buffered
+= tmp
- count
;
976 ieee80211_add_pending_skbs_fn(local
, &pending
, clear_sta_ps_flags
, sta
);
978 local
->total_ps_buffered
-= buffered
;
980 sta_info_recalc_tim(sta
);
983 "STA %pM aid %d sending %d filtered/%d PS frames since STA not sleeping anymore\n",
984 sta
->sta
.addr
, sta
->sta
.aid
, filtered
, buffered
);
987 static void ieee80211_send_null_response(struct ieee80211_sub_if_data
*sdata
,
988 struct sta_info
*sta
, int tid
,
989 enum ieee80211_frame_release_type reason
)
991 struct ieee80211_local
*local
= sdata
->local
;
992 struct ieee80211_qos_hdr
*nullfunc
;
994 int size
= sizeof(*nullfunc
);
996 bool qos
= test_sta_flag(sta
, WLAN_STA_WME
);
997 struct ieee80211_tx_info
*info
;
1000 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
|
1001 IEEE80211_STYPE_QOS_NULLFUNC
|
1002 IEEE80211_FCTL_FROMDS
);
1005 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
|
1006 IEEE80211_STYPE_NULLFUNC
|
1007 IEEE80211_FCTL_FROMDS
);
1010 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ size
);
1014 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
1016 nullfunc
= (void *) skb_put(skb
, size
);
1017 nullfunc
->frame_control
= fc
;
1018 nullfunc
->duration_id
= 0;
1019 memcpy(nullfunc
->addr1
, sta
->sta
.addr
, ETH_ALEN
);
1020 memcpy(nullfunc
->addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1021 memcpy(nullfunc
->addr3
, sdata
->vif
.addr
, ETH_ALEN
);
1023 skb
->priority
= tid
;
1024 skb_set_queue_mapping(skb
, ieee802_1d_to_ac
[tid
]);
1026 nullfunc
->qos_ctrl
= cpu_to_le16(tid
);
1028 if (reason
== IEEE80211_FRAME_RELEASE_UAPSD
)
1029 nullfunc
->qos_ctrl
|=
1030 cpu_to_le16(IEEE80211_QOS_CTL_EOSP
);
1033 info
= IEEE80211_SKB_CB(skb
);
1036 * Tell TX path to send this frame even though the
1037 * STA may still remain is PS mode after this frame
1038 * exchange. Also set EOSP to indicate this packet
1039 * ends the poll/service period.
1041 info
->flags
|= IEEE80211_TX_CTL_NO_PS_BUFFER
|
1042 IEEE80211_TX_STATUS_EOSP
|
1043 IEEE80211_TX_CTL_REQ_TX_STATUS
;
1045 drv_allow_buffered_frames(local
, sta
, BIT(tid
), 1, reason
, false);
1047 ieee80211_xmit(sdata
, skb
);
1051 ieee80211_sta_ps_deliver_response(struct sta_info
*sta
,
1052 int n_frames
, u8 ignored_acs
,
1053 enum ieee80211_frame_release_type reason
)
1055 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
1056 struct ieee80211_local
*local
= sdata
->local
;
1058 bool more_data
= false;
1060 unsigned long driver_release_tids
= 0;
1061 struct sk_buff_head frames
;
1063 /* Service or PS-Poll period starts */
1064 set_sta_flag(sta
, WLAN_STA_SP
);
1066 __skb_queue_head_init(&frames
);
1069 * Get response frame(s) and more data bit for it.
1071 for (ac
= 0; ac
< IEEE80211_NUM_ACS
; ac
++) {
1074 if (ignored_acs
& BIT(ac
))
1077 tids
= ieee80211_tids_for_ac(ac
);
1080 driver_release_tids
= sta
->driver_buffered_tids
& tids
;
1081 if (driver_release_tids
) {
1084 struct sk_buff
*skb
;
1086 while (n_frames
> 0) {
1087 skb
= skb_dequeue(&sta
->tx_filtered
[ac
]);
1090 &sta
->ps_tx_buf
[ac
]);
1092 local
->total_ps_buffered
--;
1098 __skb_queue_tail(&frames
, skb
);
1103 * If the driver has data on more than one TID then
1104 * certainly there's more data if we release just a
1105 * single frame now (from a single TID).
1107 if (reason
== IEEE80211_FRAME_RELEASE_PSPOLL
&&
1108 hweight16(driver_release_tids
) > 1) {
1110 driver_release_tids
=
1111 BIT(ffs(driver_release_tids
) - 1);
1116 if (!skb_queue_empty(&sta
->tx_filtered
[ac
]) ||
1117 !skb_queue_empty(&sta
->ps_tx_buf
[ac
])) {
1127 * For PS-Poll, this can only happen due to a race condition
1128 * when we set the TIM bit and the station notices it, but
1129 * before it can poll for the frame we expire it.
1131 * For uAPSD, this is said in the standard (11.2.1.5 h):
1132 * At each unscheduled SP for a non-AP STA, the AP shall
1133 * attempt to transmit at least one MSDU or MMPDU, but no
1134 * more than the value specified in the Max SP Length field
1135 * in the QoS Capability element from delivery-enabled ACs,
1136 * that are destined for the non-AP STA.
1138 * Since we have no other MSDU/MMPDU, transmit a QoS null frame.
1141 /* This will evaluate to 1, 3, 5 or 7. */
1142 tid
= 7 - ((ffs(~ignored_acs
) - 1) << 1);
1144 ieee80211_send_null_response(sdata
, sta
, tid
, reason
);
1148 if (!driver_release_tids
) {
1149 struct sk_buff_head pending
;
1150 struct sk_buff
*skb
;
1154 skb_queue_head_init(&pending
);
1156 while ((skb
= __skb_dequeue(&frames
))) {
1157 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1158 struct ieee80211_hdr
*hdr
= (void *) skb
->data
;
1164 * Tell TX path to send this frame even though the
1165 * STA may still remain is PS mode after this frame
1168 info
->flags
|= IEEE80211_TX_CTL_NO_PS_BUFFER
;
1171 * Use MoreData flag to indicate whether there are
1172 * more buffered frames for this STA
1174 if (more_data
|| !skb_queue_empty(&frames
))
1175 hdr
->frame_control
|=
1176 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
1178 hdr
->frame_control
&=
1179 cpu_to_le16(~IEEE80211_FCTL_MOREDATA
);
1181 if (ieee80211_is_data_qos(hdr
->frame_control
) ||
1182 ieee80211_is_qos_nullfunc(hdr
->frame_control
))
1183 qoshdr
= ieee80211_get_qos_ctl(hdr
);
1185 /* end service period after last frame */
1186 if (skb_queue_empty(&frames
)) {
1187 if (reason
== IEEE80211_FRAME_RELEASE_UAPSD
&&
1189 *qoshdr
|= IEEE80211_QOS_CTL_EOSP
;
1191 info
->flags
|= IEEE80211_TX_STATUS_EOSP
|
1192 IEEE80211_TX_CTL_REQ_TX_STATUS
;
1196 tids
|= BIT(*qoshdr
& IEEE80211_QOS_CTL_TID_MASK
);
1200 __skb_queue_tail(&pending
, skb
);
1203 drv_allow_buffered_frames(local
, sta
, tids
, num
,
1206 ieee80211_add_pending_skbs(local
, &pending
);
1208 sta_info_recalc_tim(sta
);
1211 * We need to release a frame that is buffered somewhere in the
1212 * driver ... it'll have to handle that.
1213 * Note that, as per the comment above, it'll also have to see
1214 * if there is more than just one frame on the specific TID that
1215 * we're releasing from, and it needs to set the more-data bit
1216 * accordingly if we tell it that there's no more data. If we do
1217 * tell it there's more data, then of course the more-data bit
1218 * needs to be set anyway.
1220 drv_release_buffered_frames(local
, sta
, driver_release_tids
,
1221 n_frames
, reason
, more_data
);
1224 * Note that we don't recalculate the TIM bit here as it would
1225 * most likely have no effect at all unless the driver told us
1226 * that the TID became empty before returning here from the
1228 * Either way, however, when the driver tells us that the TID
1229 * became empty we'll do the TIM recalculation.
1234 void ieee80211_sta_ps_deliver_poll_response(struct sta_info
*sta
)
1236 u8 ignore_for_response
= sta
->sta
.uapsd_queues
;
1239 * If all ACs are delivery-enabled then we should reply
1240 * from any of them, if only some are enabled we reply
1241 * only from the non-enabled ones.
1243 if (ignore_for_response
== BIT(IEEE80211_NUM_ACS
) - 1)
1244 ignore_for_response
= 0;
1246 ieee80211_sta_ps_deliver_response(sta
, 1, ignore_for_response
,
1247 IEEE80211_FRAME_RELEASE_PSPOLL
);
1250 void ieee80211_sta_ps_deliver_uapsd(struct sta_info
*sta
)
1252 int n_frames
= sta
->sta
.max_sp
;
1253 u8 delivery_enabled
= sta
->sta
.uapsd_queues
;
1256 * If we ever grow support for TSPEC this might happen if
1257 * the TSPEC update from hostapd comes in between a trigger
1258 * frame setting WLAN_STA_UAPSD in the RX path and this
1259 * actually getting called.
1261 if (!delivery_enabled
)
1264 switch (sta
->sta
.max_sp
) {
1275 /* XXX: what is a good value? */
1280 ieee80211_sta_ps_deliver_response(sta
, n_frames
, ~delivery_enabled
,
1281 IEEE80211_FRAME_RELEASE_UAPSD
);
1284 void ieee80211_sta_block_awake(struct ieee80211_hw
*hw
,
1285 struct ieee80211_sta
*pubsta
, bool block
)
1287 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
1289 trace_api_sta_block_awake(sta
->local
, pubsta
, block
);
1292 set_sta_flag(sta
, WLAN_STA_PS_DRIVER
);
1293 else if (test_sta_flag(sta
, WLAN_STA_PS_DRIVER
))
1294 ieee80211_queue_work(hw
, &sta
->drv_unblock_wk
);
1296 EXPORT_SYMBOL(ieee80211_sta_block_awake
);
1298 void ieee80211_sta_eosp_irqsafe(struct ieee80211_sta
*pubsta
)
1300 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
1301 struct ieee80211_local
*local
= sta
->local
;
1302 struct sk_buff
*skb
;
1303 struct skb_eosp_msg_data
*data
;
1305 trace_api_eosp(local
, pubsta
);
1307 skb
= alloc_skb(0, GFP_ATOMIC
);
1309 /* too bad ... but race is better than loss */
1310 clear_sta_flag(sta
, WLAN_STA_SP
);
1314 data
= (void *)skb
->cb
;
1315 memcpy(data
->sta
, pubsta
->addr
, ETH_ALEN
);
1316 memcpy(data
->iface
, sta
->sdata
->vif
.addr
, ETH_ALEN
);
1317 skb
->pkt_type
= IEEE80211_EOSP_MSG
;
1318 skb_queue_tail(&local
->skb_queue
, skb
);
1319 tasklet_schedule(&local
->tasklet
);
1321 EXPORT_SYMBOL(ieee80211_sta_eosp_irqsafe
);
1323 void ieee80211_sta_set_buffered(struct ieee80211_sta
*pubsta
,
1324 u8 tid
, bool buffered
)
1326 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
1328 if (WARN_ON(tid
>= STA_TID_NUM
))
1332 set_bit(tid
, &sta
->driver_buffered_tids
);
1334 clear_bit(tid
, &sta
->driver_buffered_tids
);
1336 sta_info_recalc_tim(sta
);
1338 EXPORT_SYMBOL(ieee80211_sta_set_buffered
);
1340 int sta_info_move_state(struct sta_info
*sta
,
1341 enum ieee80211_sta_state new_state
)
1345 if (sta
->sta_state
== new_state
)
1348 /* check allowed transitions first */
1350 switch (new_state
) {
1351 case IEEE80211_STA_NONE
:
1352 if (sta
->sta_state
!= IEEE80211_STA_AUTH
)
1355 case IEEE80211_STA_AUTH
:
1356 if (sta
->sta_state
!= IEEE80211_STA_NONE
&&
1357 sta
->sta_state
!= IEEE80211_STA_ASSOC
)
1360 case IEEE80211_STA_ASSOC
:
1361 if (sta
->sta_state
!= IEEE80211_STA_AUTH
&&
1362 sta
->sta_state
!= IEEE80211_STA_AUTHORIZED
)
1365 case IEEE80211_STA_AUTHORIZED
:
1366 if (sta
->sta_state
!= IEEE80211_STA_ASSOC
)
1370 WARN(1, "invalid state %d", new_state
);
1374 sta_dbg(sta
->sdata
, "moving STA %pM to state %d\n",
1375 sta
->sta
.addr
, new_state
);
1378 * notify the driver before the actual changes so it can
1379 * fail the transition
1381 if (test_sta_flag(sta
, WLAN_STA_INSERTED
)) {
1382 int err
= drv_sta_state(sta
->local
, sta
->sdata
, sta
,
1383 sta
->sta_state
, new_state
);
1388 /* reflect the change in all state variables */
1390 switch (new_state
) {
1391 case IEEE80211_STA_NONE
:
1392 if (sta
->sta_state
== IEEE80211_STA_AUTH
)
1393 clear_bit(WLAN_STA_AUTH
, &sta
->_flags
);
1395 case IEEE80211_STA_AUTH
:
1396 if (sta
->sta_state
== IEEE80211_STA_NONE
)
1397 set_bit(WLAN_STA_AUTH
, &sta
->_flags
);
1398 else if (sta
->sta_state
== IEEE80211_STA_ASSOC
)
1399 clear_bit(WLAN_STA_ASSOC
, &sta
->_flags
);
1401 case IEEE80211_STA_ASSOC
:
1402 if (sta
->sta_state
== IEEE80211_STA_AUTH
) {
1403 set_bit(WLAN_STA_ASSOC
, &sta
->_flags
);
1404 } else if (sta
->sta_state
== IEEE80211_STA_AUTHORIZED
) {
1405 if (sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1406 (sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1407 !sta
->sdata
->u
.vlan
.sta
))
1408 atomic_dec(&sta
->sdata
->bss
->num_mcast_sta
);
1409 clear_bit(WLAN_STA_AUTHORIZED
, &sta
->_flags
);
1412 case IEEE80211_STA_AUTHORIZED
:
1413 if (sta
->sta_state
== IEEE80211_STA_ASSOC
) {
1414 if (sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1415 (sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1416 !sta
->sdata
->u
.vlan
.sta
))
1417 atomic_inc(&sta
->sdata
->bss
->num_mcast_sta
);
1418 set_bit(WLAN_STA_AUTHORIZED
, &sta
->_flags
);
1425 sta
->sta_state
= new_state
;