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 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
173 wiphy_debug(local
->hw
.wiphy
, "Destroyed STA %pM\n", sta
->sta
.addr
);
174 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
179 /* Caller must hold local->sta_mtx */
180 static void sta_info_hash_add(struct ieee80211_local
*local
,
181 struct sta_info
*sta
)
183 lockdep_assert_held(&local
->sta_mtx
);
184 sta
->hnext
= local
->sta_hash
[STA_HASH(sta
->sta
.addr
)];
185 rcu_assign_pointer(local
->sta_hash
[STA_HASH(sta
->sta
.addr
)], sta
);
188 static void sta_unblock(struct work_struct
*wk
)
190 struct sta_info
*sta
;
192 sta
= container_of(wk
, struct sta_info
, drv_unblock_wk
);
197 if (!test_sta_flag(sta
, WLAN_STA_PS_STA
)) {
199 ieee80211_sta_ps_deliver_wakeup(sta
);
201 } else if (test_and_clear_sta_flag(sta
, WLAN_STA_PSPOLL
)) {
202 clear_sta_flag(sta
, WLAN_STA_PS_DRIVER
);
205 ieee80211_sta_ps_deliver_poll_response(sta
);
207 } else if (test_and_clear_sta_flag(sta
, WLAN_STA_UAPSD
)) {
208 clear_sta_flag(sta
, WLAN_STA_PS_DRIVER
);
211 ieee80211_sta_ps_deliver_uapsd(sta
);
214 clear_sta_flag(sta
, WLAN_STA_PS_DRIVER
);
217 static int sta_prepare_rate_control(struct ieee80211_local
*local
,
218 struct sta_info
*sta
, gfp_t gfp
)
220 if (local
->hw
.flags
& IEEE80211_HW_HAS_RATE_CONTROL
)
223 sta
->rate_ctrl
= local
->rate_ctrl
;
224 sta
->rate_ctrl_priv
= rate_control_alloc_sta(sta
->rate_ctrl
,
226 if (!sta
->rate_ctrl_priv
)
232 struct sta_info
*sta_info_alloc(struct ieee80211_sub_if_data
*sdata
,
233 const u8
*addr
, gfp_t gfp
)
235 struct ieee80211_local
*local
= sdata
->local
;
236 struct sta_info
*sta
;
237 struct timespec uptime
;
240 sta
= kzalloc(sizeof(*sta
) + local
->hw
.sta_data_size
, gfp
);
244 spin_lock_init(&sta
->lock
);
245 INIT_WORK(&sta
->drv_unblock_wk
, sta_unblock
);
246 INIT_WORK(&sta
->ampdu_mlme
.work
, ieee80211_ba_session_work
);
247 mutex_init(&sta
->ampdu_mlme
.mtx
);
249 memcpy(sta
->sta
.addr
, addr
, ETH_ALEN
);
252 sta
->last_rx
= jiffies
;
254 sta
->sta_state
= IEEE80211_STA_NONE
;
256 do_posix_clock_monotonic_gettime(&uptime
);
257 sta
->last_connected
= uptime
.tv_sec
;
258 ewma_init(&sta
->avg_signal
, 1024, 8);
260 if (sta_prepare_rate_control(local
, sta
, gfp
)) {
265 for (i
= 0; i
< STA_TID_NUM
; i
++) {
267 * timer_to_tid must be initialized with identity mapping
268 * to enable session_timer's data differentiation. See
269 * sta_rx_agg_session_timer_expired for usage.
271 sta
->timer_to_tid
[i
] = i
;
273 for (i
= 0; i
< IEEE80211_NUM_ACS
; i
++) {
274 skb_queue_head_init(&sta
->ps_tx_buf
[i
]);
275 skb_queue_head_init(&sta
->tx_filtered
[i
]);
278 for (i
= 0; i
< NUM_RX_DATA_QUEUES
; i
++)
279 sta
->last_seq_ctrl
[i
] = cpu_to_le16(USHRT_MAX
);
281 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
282 wiphy_debug(local
->hw
.wiphy
, "Allocated STA %pM\n", sta
->sta
.addr
);
283 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
285 #ifdef CONFIG_MAC80211_MESH
286 sta
->plink_state
= NL80211_PLINK_LISTEN
;
287 init_timer(&sta
->plink_timer
);
293 static int sta_info_insert_check(struct sta_info
*sta
)
295 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
298 * Can't be a WARN_ON because it can be triggered through a race:
299 * something inserts a STA (on one CPU) without holding the RTNL
300 * and another CPU turns off the net device.
302 if (unlikely(!ieee80211_sdata_running(sdata
)))
305 if (WARN_ON(ether_addr_equal(sta
->sta
.addr
, sdata
->vif
.addr
) ||
306 is_multicast_ether_addr(sta
->sta
.addr
)))
312 static int sta_info_insert_drv_state(struct ieee80211_local
*local
,
313 struct ieee80211_sub_if_data
*sdata
,
314 struct sta_info
*sta
)
316 enum ieee80211_sta_state state
;
319 for (state
= IEEE80211_STA_NOTEXIST
; state
< sta
->sta_state
; state
++) {
320 err
= drv_sta_state(local
, sdata
, sta
, state
, state
+ 1);
327 * Drivers using legacy sta_add/sta_remove callbacks only
328 * get uploaded set to true after sta_add is called.
330 if (!local
->ops
->sta_add
)
331 sta
->uploaded
= true;
335 if (sdata
->vif
.type
== NL80211_IFTYPE_ADHOC
) {
336 pr_debug("%s: failed to move IBSS STA %pM to state %d (%d) - keeping it anyway\n",
337 sdata
->name
, sta
->sta
.addr
, state
+ 1, err
);
341 /* unwind on error */
342 for (; state
> IEEE80211_STA_NOTEXIST
; state
--)
343 WARN_ON(drv_sta_state(local
, sdata
, sta
, state
, state
- 1));
349 * should be called with sta_mtx locked
350 * this function replaces the mutex lock
353 static int sta_info_insert_finish(struct sta_info
*sta
) __acquires(RCU
)
355 struct ieee80211_local
*local
= sta
->local
;
356 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
357 struct station_info sinfo
;
360 lockdep_assert_held(&local
->sta_mtx
);
362 /* check if STA exists already */
363 if (sta_info_get_bss(sdata
, sta
->sta
.addr
)) {
369 err
= sta_info_insert_drv_state(local
, sdata
, sta
);
374 local
->sta_generation
++;
377 /* make the station visible */
378 sta_info_hash_add(local
, sta
);
380 list_add_rcu(&sta
->list
, &local
->sta_list
);
382 set_sta_flag(sta
, WLAN_STA_INSERTED
);
384 ieee80211_sta_debugfs_add(sta
);
385 rate_control_add_sta_debugfs(sta
);
387 memset(&sinfo
, 0, sizeof(sinfo
));
389 sinfo
.generation
= local
->sta_generation
;
390 cfg80211_new_sta(sdata
->dev
, sta
->sta
.addr
, &sinfo
, GFP_KERNEL
);
392 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
393 wiphy_debug(local
->hw
.wiphy
, "Inserted STA %pM\n", sta
->sta
.addr
);
394 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
396 /* move reference to rcu-protected */
398 mutex_unlock(&local
->sta_mtx
);
400 if (ieee80211_vif_is_mesh(&sdata
->vif
))
401 mesh_accept_plinks_update(sdata
);
405 mutex_unlock(&local
->sta_mtx
);
410 int sta_info_insert_rcu(struct sta_info
*sta
) __acquires(RCU
)
412 struct ieee80211_local
*local
= sta
->local
;
417 err
= sta_info_insert_check(sta
);
423 mutex_lock(&local
->sta_mtx
);
425 err
= sta_info_insert_finish(sta
);
432 sta_info_free(local
, sta
);
436 int sta_info_insert(struct sta_info
*sta
)
438 int err
= sta_info_insert_rcu(sta
);
445 static inline void __bss_tim_set(struct ieee80211_if_ap
*bss
, u16 aid
)
448 * This format has been mandated by the IEEE specifications,
449 * so this line may not be changed to use the __set_bit() format.
451 bss
->tim
[aid
/ 8] |= (1 << (aid
% 8));
454 static inline void __bss_tim_clear(struct ieee80211_if_ap
*bss
, u16 aid
)
457 * This format has been mandated by the IEEE specifications,
458 * so this line may not be changed to use the __clear_bit() format.
460 bss
->tim
[aid
/ 8] &= ~(1 << (aid
% 8));
463 static unsigned long ieee80211_tids_for_ac(int ac
)
465 /* If we ever support TIDs > 7, this obviously needs to be adjusted */
467 case IEEE80211_AC_VO
:
468 return BIT(6) | BIT(7);
469 case IEEE80211_AC_VI
:
470 return BIT(4) | BIT(5);
471 case IEEE80211_AC_BE
:
472 return BIT(0) | BIT(3);
473 case IEEE80211_AC_BK
:
474 return BIT(1) | BIT(2);
481 void sta_info_recalc_tim(struct sta_info
*sta
)
483 struct ieee80211_local
*local
= sta
->local
;
484 struct ieee80211_if_ap
*bss
= sta
->sdata
->bss
;
486 bool indicate_tim
= false;
487 u8 ignore_for_tim
= sta
->sta
.uapsd_queues
;
490 if (WARN_ON_ONCE(!sta
->sdata
->bss
))
493 /* No need to do anything if the driver does all */
494 if (local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
)
501 * If all ACs are delivery-enabled then we should build
502 * the TIM bit for all ACs anyway; if only some are then
503 * we ignore those and build the TIM bit using only the
506 if (ignore_for_tim
== BIT(IEEE80211_NUM_ACS
) - 1)
509 for (ac
= 0; ac
< IEEE80211_NUM_ACS
; ac
++) {
512 if (ignore_for_tim
& BIT(ac
))
515 indicate_tim
|= !skb_queue_empty(&sta
->tx_filtered
[ac
]) ||
516 !skb_queue_empty(&sta
->ps_tx_buf
[ac
]);
520 tids
= ieee80211_tids_for_ac(ac
);
523 sta
->driver_buffered_tids
& tids
;
527 spin_lock_irqsave(&local
->tim_lock
, flags
);
530 __bss_tim_set(bss
, sta
->sta
.aid
);
532 __bss_tim_clear(bss
, sta
->sta
.aid
);
534 if (local
->ops
->set_tim
) {
535 local
->tim_in_locked_section
= true;
536 drv_set_tim(local
, &sta
->sta
, indicate_tim
);
537 local
->tim_in_locked_section
= false;
540 spin_unlock_irqrestore(&local
->tim_lock
, flags
);
543 static bool sta_info_buffer_expired(struct sta_info
*sta
, struct sk_buff
*skb
)
545 struct ieee80211_tx_info
*info
;
551 info
= IEEE80211_SKB_CB(skb
);
553 /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
554 timeout
= (sta
->listen_interval
*
555 sta
->sdata
->vif
.bss_conf
.beacon_int
*
557 if (timeout
< STA_TX_BUFFER_EXPIRE
)
558 timeout
= STA_TX_BUFFER_EXPIRE
;
559 return time_after(jiffies
, info
->control
.jiffies
+ timeout
);
563 static bool sta_info_cleanup_expire_buffered_ac(struct ieee80211_local
*local
,
564 struct sta_info
*sta
, int ac
)
570 * First check for frames that should expire on the filtered
571 * queue. Frames here were rejected by the driver and are on
572 * a separate queue to avoid reordering with normal PS-buffered
573 * frames. They also aren't accounted for right now in the
574 * total_ps_buffered counter.
577 spin_lock_irqsave(&sta
->tx_filtered
[ac
].lock
, flags
);
578 skb
= skb_peek(&sta
->tx_filtered
[ac
]);
579 if (sta_info_buffer_expired(sta
, skb
))
580 skb
= __skb_dequeue(&sta
->tx_filtered
[ac
]);
583 spin_unlock_irqrestore(&sta
->tx_filtered
[ac
].lock
, flags
);
586 * Frames are queued in order, so if this one
587 * hasn't expired yet we can stop testing. If
588 * we actually reached the end of the queue we
589 * also need to stop, of course.
597 * Now also check the normal PS-buffered queue, this will
598 * only find something if the filtered queue was emptied
599 * since the filtered frames are all before the normal PS
603 spin_lock_irqsave(&sta
->ps_tx_buf
[ac
].lock
, flags
);
604 skb
= skb_peek(&sta
->ps_tx_buf
[ac
]);
605 if (sta_info_buffer_expired(sta
, skb
))
606 skb
= __skb_dequeue(&sta
->ps_tx_buf
[ac
]);
609 spin_unlock_irqrestore(&sta
->ps_tx_buf
[ac
].lock
, flags
);
612 * frames are queued in order, so if this one
613 * hasn't expired yet (or we reached the end of
614 * the queue) we can stop testing
619 local
->total_ps_buffered
--;
620 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
621 pr_debug("Buffered frame expired (STA %pM)\n", sta
->sta
.addr
);
627 * Finally, recalculate the TIM bit for this station -- it might
628 * now be clear because the station was too slow to retrieve its
631 sta_info_recalc_tim(sta
);
634 * Return whether there are any frames still buffered, this is
635 * used to check whether the cleanup timer still needs to run,
636 * if there are no frames we don't need to rearm the timer.
638 return !(skb_queue_empty(&sta
->ps_tx_buf
[ac
]) &&
639 skb_queue_empty(&sta
->tx_filtered
[ac
]));
642 static bool sta_info_cleanup_expire_buffered(struct ieee80211_local
*local
,
643 struct sta_info
*sta
)
645 bool have_buffered
= false;
648 /* This is only necessary for stations on BSS interfaces */
649 if (!sta
->sdata
->bss
)
652 for (ac
= 0; ac
< IEEE80211_NUM_ACS
; ac
++)
654 sta_info_cleanup_expire_buffered_ac(local
, sta
, ac
);
656 return have_buffered
;
659 int __must_check
__sta_info_destroy(struct sta_info
*sta
)
661 struct ieee80211_local
*local
;
662 struct ieee80211_sub_if_data
*sdata
;
664 struct tid_ampdu_tx
*tid_tx
;
674 lockdep_assert_held(&local
->sta_mtx
);
677 * Before removing the station from the driver and
678 * rate control, it might still start new aggregation
679 * sessions -- block that to make sure the tear-down
680 * will be sufficient.
682 set_sta_flag(sta
, WLAN_STA_BLOCK_BA
);
683 ieee80211_sta_tear_down_BA_sessions(sta
, true);
685 ret
= sta_info_hash_del(local
, sta
);
689 list_del_rcu(&sta
->list
);
691 mutex_lock(&local
->key_mtx
);
692 for (i
= 0; i
< NUM_DEFAULT_KEYS
; i
++)
693 __ieee80211_key_free(key_mtx_dereference(local
, sta
->gtk
[i
]));
695 __ieee80211_key_free(key_mtx_dereference(local
, sta
->ptk
));
696 mutex_unlock(&local
->key_mtx
);
701 local
->sta_generation
++;
703 if (sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
)
704 RCU_INIT_POINTER(sdata
->u
.vlan
.sta
, NULL
);
706 while (sta
->sta_state
> IEEE80211_STA_NONE
) {
707 ret
= sta_info_move_state(sta
, sta
->sta_state
- 1);
715 ret
= drv_sta_state(local
, sdata
, sta
, IEEE80211_STA_NONE
,
716 IEEE80211_STA_NOTEXIST
);
717 WARN_ON_ONCE(ret
!= 0);
721 * At this point, after we wait for an RCU grace period,
722 * neither mac80211 nor the driver can reference this
723 * sta struct any more except by still existing timers
724 * associated with this station that we clean up below.
728 if (test_sta_flag(sta
, WLAN_STA_PS_STA
)) {
731 clear_sta_flag(sta
, WLAN_STA_PS_STA
);
733 atomic_dec(&sdata
->bss
->num_sta_ps
);
734 sta_info_recalc_tim(sta
);
737 for (ac
= 0; ac
< IEEE80211_NUM_ACS
; ac
++) {
738 local
->total_ps_buffered
-= skb_queue_len(&sta
->ps_tx_buf
[ac
]);
739 __skb_queue_purge(&sta
->ps_tx_buf
[ac
]);
740 __skb_queue_purge(&sta
->tx_filtered
[ac
]);
743 #ifdef CONFIG_MAC80211_MESH
744 if (ieee80211_vif_is_mesh(&sdata
->vif
))
745 mesh_accept_plinks_update(sdata
);
748 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
749 wiphy_debug(local
->hw
.wiphy
, "Removed STA %pM\n", sta
->sta
.addr
);
750 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
751 cancel_work_sync(&sta
->drv_unblock_wk
);
753 cfg80211_del_sta(sdata
->dev
, sta
->sta
.addr
, GFP_KERNEL
);
755 rate_control_remove_sta_debugfs(sta
);
756 ieee80211_sta_debugfs_remove(sta
);
758 #ifdef CONFIG_MAC80211_MESH
759 if (ieee80211_vif_is_mesh(&sta
->sdata
->vif
)) {
760 mesh_plink_deactivate(sta
);
761 del_timer_sync(&sta
->plink_timer
);
766 * Destroy aggregation state here. It would be nice to wait for the
767 * driver to finish aggregation stop and then clean up, but for now
768 * drivers have to handle aggregation stop being requested, followed
769 * directly by station destruction.
771 for (i
= 0; i
< STA_TID_NUM
; i
++) {
772 tid_tx
= rcu_dereference_raw(sta
->ampdu_mlme
.tid_tx
[i
]);
775 __skb_queue_purge(&tid_tx
->pending
);
779 sta_info_free(local
, sta
);
784 int sta_info_destroy_addr(struct ieee80211_sub_if_data
*sdata
, const u8
*addr
)
786 struct sta_info
*sta
;
789 mutex_lock(&sdata
->local
->sta_mtx
);
790 sta
= sta_info_get(sdata
, addr
);
791 ret
= __sta_info_destroy(sta
);
792 mutex_unlock(&sdata
->local
->sta_mtx
);
797 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data
*sdata
,
800 struct sta_info
*sta
;
803 mutex_lock(&sdata
->local
->sta_mtx
);
804 sta
= sta_info_get_bss(sdata
, addr
);
805 ret
= __sta_info_destroy(sta
);
806 mutex_unlock(&sdata
->local
->sta_mtx
);
811 static void sta_info_cleanup(unsigned long data
)
813 struct ieee80211_local
*local
= (struct ieee80211_local
*) data
;
814 struct sta_info
*sta
;
815 bool timer_needed
= false;
818 list_for_each_entry_rcu(sta
, &local
->sta_list
, list
)
819 if (sta_info_cleanup_expire_buffered(local
, sta
))
823 if (local
->quiescing
)
829 mod_timer(&local
->sta_cleanup
,
830 round_jiffies(jiffies
+ STA_INFO_CLEANUP_INTERVAL
));
833 void sta_info_init(struct ieee80211_local
*local
)
835 spin_lock_init(&local
->tim_lock
);
836 mutex_init(&local
->sta_mtx
);
837 INIT_LIST_HEAD(&local
->sta_list
);
839 setup_timer(&local
->sta_cleanup
, sta_info_cleanup
,
840 (unsigned long)local
);
843 void sta_info_stop(struct ieee80211_local
*local
)
845 del_timer(&local
->sta_cleanup
);
846 sta_info_flush(local
, NULL
);
850 * sta_info_flush - flush matching STA entries from the STA table
852 * Returns the number of removed STA entries.
854 * @local: local interface data
855 * @sdata: matching rule for the net device (sta->dev) or %NULL to match all STAs
857 int sta_info_flush(struct ieee80211_local
*local
,
858 struct ieee80211_sub_if_data
*sdata
)
860 struct sta_info
*sta
, *tmp
;
865 mutex_lock(&local
->sta_mtx
);
866 list_for_each_entry_safe(sta
, tmp
, &local
->sta_list
, list
) {
867 if (!sdata
|| sdata
== sta
->sdata
) {
868 WARN_ON(__sta_info_destroy(sta
));
872 mutex_unlock(&local
->sta_mtx
);
877 void ieee80211_sta_expire(struct ieee80211_sub_if_data
*sdata
,
878 unsigned long exp_time
)
880 struct ieee80211_local
*local
= sdata
->local
;
881 struct sta_info
*sta
, *tmp
;
883 mutex_lock(&local
->sta_mtx
);
885 list_for_each_entry_safe(sta
, tmp
, &local
->sta_list
, list
) {
886 if (sdata
!= sta
->sdata
)
889 if (time_after(jiffies
, sta
->last_rx
+ exp_time
)) {
890 ibss_vdbg("%s: expiring inactive STA %pM\n",
891 sdata
->name
, sta
->sta
.addr
);
892 WARN_ON(__sta_info_destroy(sta
));
896 mutex_unlock(&local
->sta_mtx
);
899 struct ieee80211_sta
*ieee80211_find_sta_by_ifaddr(struct ieee80211_hw
*hw
,
903 struct sta_info
*sta
, *nxt
;
906 * Just return a random station if localaddr is NULL
909 for_each_sta_info(hw_to_local(hw
), addr
, sta
, nxt
) {
911 !ether_addr_equal(sta
->sdata
->vif
.addr
, localaddr
))
920 EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr
);
922 struct ieee80211_sta
*ieee80211_find_sta(struct ieee80211_vif
*vif
,
925 struct sta_info
*sta
;
930 sta
= sta_info_get_bss(vif_to_sdata(vif
), addr
);
939 EXPORT_SYMBOL(ieee80211_find_sta
);
941 static void clear_sta_ps_flags(void *_sta
)
943 struct sta_info
*sta
= _sta
;
944 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
946 clear_sta_flag(sta
, WLAN_STA_PS_DRIVER
);
947 if (test_and_clear_sta_flag(sta
, WLAN_STA_PS_STA
))
948 atomic_dec(&sdata
->bss
->num_sta_ps
);
951 /* powersave support code */
952 void ieee80211_sta_ps_deliver_wakeup(struct sta_info
*sta
)
954 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
955 struct ieee80211_local
*local
= sdata
->local
;
956 struct sk_buff_head pending
;
957 int filtered
= 0, buffered
= 0, ac
;
959 clear_sta_flag(sta
, WLAN_STA_SP
);
961 BUILD_BUG_ON(BITS_TO_LONGS(STA_TID_NUM
) > 1);
962 sta
->driver_buffered_tids
= 0;
964 if (!(local
->hw
.flags
& IEEE80211_HW_AP_LINK_PS
))
965 drv_sta_notify(local
, sdata
, STA_NOTIFY_AWAKE
, &sta
->sta
);
967 skb_queue_head_init(&pending
);
969 /* Send all buffered frames to the station */
970 for (ac
= 0; ac
< IEEE80211_NUM_ACS
; ac
++) {
971 int count
= skb_queue_len(&pending
), tmp
;
973 skb_queue_splice_tail_init(&sta
->tx_filtered
[ac
], &pending
);
974 tmp
= skb_queue_len(&pending
);
975 filtered
+= tmp
- count
;
978 skb_queue_splice_tail_init(&sta
->ps_tx_buf
[ac
], &pending
);
979 tmp
= skb_queue_len(&pending
);
980 buffered
+= tmp
- count
;
983 ieee80211_add_pending_skbs_fn(local
, &pending
, clear_sta_ps_flags
, sta
);
985 local
->total_ps_buffered
-= buffered
;
987 sta_info_recalc_tim(sta
);
989 #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
990 pr_debug("%s: STA %pM aid %d sending %d filtered/%d PS frames since STA not sleeping anymore\n",
991 sdata
->name
, sta
->sta
.addr
, sta
->sta
.aid
, filtered
, buffered
);
992 #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
995 static void ieee80211_send_null_response(struct ieee80211_sub_if_data
*sdata
,
996 struct sta_info
*sta
, int tid
,
997 enum ieee80211_frame_release_type reason
)
999 struct ieee80211_local
*local
= sdata
->local
;
1000 struct ieee80211_qos_hdr
*nullfunc
;
1001 struct sk_buff
*skb
;
1002 int size
= sizeof(*nullfunc
);
1004 bool qos
= test_sta_flag(sta
, WLAN_STA_WME
);
1005 struct ieee80211_tx_info
*info
;
1008 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
|
1009 IEEE80211_STYPE_QOS_NULLFUNC
|
1010 IEEE80211_FCTL_FROMDS
);
1013 fc
= cpu_to_le16(IEEE80211_FTYPE_DATA
|
1014 IEEE80211_STYPE_NULLFUNC
|
1015 IEEE80211_FCTL_FROMDS
);
1018 skb
= dev_alloc_skb(local
->hw
.extra_tx_headroom
+ size
);
1022 skb_reserve(skb
, local
->hw
.extra_tx_headroom
);
1024 nullfunc
= (void *) skb_put(skb
, size
);
1025 nullfunc
->frame_control
= fc
;
1026 nullfunc
->duration_id
= 0;
1027 memcpy(nullfunc
->addr1
, sta
->sta
.addr
, ETH_ALEN
);
1028 memcpy(nullfunc
->addr2
, sdata
->vif
.addr
, ETH_ALEN
);
1029 memcpy(nullfunc
->addr3
, sdata
->vif
.addr
, ETH_ALEN
);
1031 skb
->priority
= tid
;
1032 skb_set_queue_mapping(skb
, ieee802_1d_to_ac
[tid
]);
1034 nullfunc
->qos_ctrl
= cpu_to_le16(tid
);
1036 if (reason
== IEEE80211_FRAME_RELEASE_UAPSD
)
1037 nullfunc
->qos_ctrl
|=
1038 cpu_to_le16(IEEE80211_QOS_CTL_EOSP
);
1041 info
= IEEE80211_SKB_CB(skb
);
1044 * Tell TX path to send this frame even though the
1045 * STA may still remain is PS mode after this frame
1046 * exchange. Also set EOSP to indicate this packet
1047 * ends the poll/service period.
1049 info
->flags
|= IEEE80211_TX_CTL_NO_PS_BUFFER
|
1050 IEEE80211_TX_STATUS_EOSP
|
1051 IEEE80211_TX_CTL_REQ_TX_STATUS
;
1053 drv_allow_buffered_frames(local
, sta
, BIT(tid
), 1, reason
, false);
1055 ieee80211_xmit(sdata
, skb
);
1059 ieee80211_sta_ps_deliver_response(struct sta_info
*sta
,
1060 int n_frames
, u8 ignored_acs
,
1061 enum ieee80211_frame_release_type reason
)
1063 struct ieee80211_sub_if_data
*sdata
= sta
->sdata
;
1064 struct ieee80211_local
*local
= sdata
->local
;
1066 bool more_data
= false;
1068 unsigned long driver_release_tids
= 0;
1069 struct sk_buff_head frames
;
1071 /* Service or PS-Poll period starts */
1072 set_sta_flag(sta
, WLAN_STA_SP
);
1074 __skb_queue_head_init(&frames
);
1077 * Get response frame(s) and more data bit for it.
1079 for (ac
= 0; ac
< IEEE80211_NUM_ACS
; ac
++) {
1082 if (ignored_acs
& BIT(ac
))
1085 tids
= ieee80211_tids_for_ac(ac
);
1088 driver_release_tids
= sta
->driver_buffered_tids
& tids
;
1089 if (driver_release_tids
) {
1092 struct sk_buff
*skb
;
1094 while (n_frames
> 0) {
1095 skb
= skb_dequeue(&sta
->tx_filtered
[ac
]);
1098 &sta
->ps_tx_buf
[ac
]);
1100 local
->total_ps_buffered
--;
1106 __skb_queue_tail(&frames
, skb
);
1111 * If the driver has data on more than one TID then
1112 * certainly there's more data if we release just a
1113 * single frame now (from a single TID).
1115 if (reason
== IEEE80211_FRAME_RELEASE_PSPOLL
&&
1116 hweight16(driver_release_tids
) > 1) {
1118 driver_release_tids
=
1119 BIT(ffs(driver_release_tids
) - 1);
1124 if (!skb_queue_empty(&sta
->tx_filtered
[ac
]) ||
1125 !skb_queue_empty(&sta
->ps_tx_buf
[ac
])) {
1135 * For PS-Poll, this can only happen due to a race condition
1136 * when we set the TIM bit and the station notices it, but
1137 * before it can poll for the frame we expire it.
1139 * For uAPSD, this is said in the standard (11.2.1.5 h):
1140 * At each unscheduled SP for a non-AP STA, the AP shall
1141 * attempt to transmit at least one MSDU or MMPDU, but no
1142 * more than the value specified in the Max SP Length field
1143 * in the QoS Capability element from delivery-enabled ACs,
1144 * that are destined for the non-AP STA.
1146 * Since we have no other MSDU/MMPDU, transmit a QoS null frame.
1149 /* This will evaluate to 1, 3, 5 or 7. */
1150 tid
= 7 - ((ffs(~ignored_acs
) - 1) << 1);
1152 ieee80211_send_null_response(sdata
, sta
, tid
, reason
);
1156 if (!driver_release_tids
) {
1157 struct sk_buff_head pending
;
1158 struct sk_buff
*skb
;
1162 skb_queue_head_init(&pending
);
1164 while ((skb
= __skb_dequeue(&frames
))) {
1165 struct ieee80211_tx_info
*info
= IEEE80211_SKB_CB(skb
);
1166 struct ieee80211_hdr
*hdr
= (void *) skb
->data
;
1172 * Tell TX path to send this frame even though the
1173 * STA may still remain is PS mode after this frame
1176 info
->flags
|= IEEE80211_TX_CTL_NO_PS_BUFFER
;
1179 * Use MoreData flag to indicate whether there are
1180 * more buffered frames for this STA
1182 if (more_data
|| !skb_queue_empty(&frames
))
1183 hdr
->frame_control
|=
1184 cpu_to_le16(IEEE80211_FCTL_MOREDATA
);
1186 hdr
->frame_control
&=
1187 cpu_to_le16(~IEEE80211_FCTL_MOREDATA
);
1189 if (ieee80211_is_data_qos(hdr
->frame_control
) ||
1190 ieee80211_is_qos_nullfunc(hdr
->frame_control
))
1191 qoshdr
= ieee80211_get_qos_ctl(hdr
);
1193 /* end service period after last frame */
1194 if (skb_queue_empty(&frames
)) {
1195 if (reason
== IEEE80211_FRAME_RELEASE_UAPSD
&&
1197 *qoshdr
|= IEEE80211_QOS_CTL_EOSP
;
1199 info
->flags
|= IEEE80211_TX_STATUS_EOSP
|
1200 IEEE80211_TX_CTL_REQ_TX_STATUS
;
1204 tids
|= BIT(*qoshdr
& IEEE80211_QOS_CTL_TID_MASK
);
1208 __skb_queue_tail(&pending
, skb
);
1211 drv_allow_buffered_frames(local
, sta
, tids
, num
,
1214 ieee80211_add_pending_skbs(local
, &pending
);
1216 sta_info_recalc_tim(sta
);
1219 * We need to release a frame that is buffered somewhere in the
1220 * driver ... it'll have to handle that.
1221 * Note that, as per the comment above, it'll also have to see
1222 * if there is more than just one frame on the specific TID that
1223 * we're releasing from, and it needs to set the more-data bit
1224 * accordingly if we tell it that there's no more data. If we do
1225 * tell it there's more data, then of course the more-data bit
1226 * needs to be set anyway.
1228 drv_release_buffered_frames(local
, sta
, driver_release_tids
,
1229 n_frames
, reason
, more_data
);
1232 * Note that we don't recalculate the TIM bit here as it would
1233 * most likely have no effect at all unless the driver told us
1234 * that the TID became empty before returning here from the
1236 * Either way, however, when the driver tells us that the TID
1237 * became empty we'll do the TIM recalculation.
1242 void ieee80211_sta_ps_deliver_poll_response(struct sta_info
*sta
)
1244 u8 ignore_for_response
= sta
->sta
.uapsd_queues
;
1247 * If all ACs are delivery-enabled then we should reply
1248 * from any of them, if only some are enabled we reply
1249 * only from the non-enabled ones.
1251 if (ignore_for_response
== BIT(IEEE80211_NUM_ACS
) - 1)
1252 ignore_for_response
= 0;
1254 ieee80211_sta_ps_deliver_response(sta
, 1, ignore_for_response
,
1255 IEEE80211_FRAME_RELEASE_PSPOLL
);
1258 void ieee80211_sta_ps_deliver_uapsd(struct sta_info
*sta
)
1260 int n_frames
= sta
->sta
.max_sp
;
1261 u8 delivery_enabled
= sta
->sta
.uapsd_queues
;
1264 * If we ever grow support for TSPEC this might happen if
1265 * the TSPEC update from hostapd comes in between a trigger
1266 * frame setting WLAN_STA_UAPSD in the RX path and this
1267 * actually getting called.
1269 if (!delivery_enabled
)
1272 switch (sta
->sta
.max_sp
) {
1283 /* XXX: what is a good value? */
1288 ieee80211_sta_ps_deliver_response(sta
, n_frames
, ~delivery_enabled
,
1289 IEEE80211_FRAME_RELEASE_UAPSD
);
1292 void ieee80211_sta_block_awake(struct ieee80211_hw
*hw
,
1293 struct ieee80211_sta
*pubsta
, bool block
)
1295 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
1297 trace_api_sta_block_awake(sta
->local
, pubsta
, block
);
1300 set_sta_flag(sta
, WLAN_STA_PS_DRIVER
);
1301 else if (test_sta_flag(sta
, WLAN_STA_PS_DRIVER
))
1302 ieee80211_queue_work(hw
, &sta
->drv_unblock_wk
);
1304 EXPORT_SYMBOL(ieee80211_sta_block_awake
);
1306 void ieee80211_sta_eosp_irqsafe(struct ieee80211_sta
*pubsta
)
1308 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
1309 struct ieee80211_local
*local
= sta
->local
;
1310 struct sk_buff
*skb
;
1311 struct skb_eosp_msg_data
*data
;
1313 trace_api_eosp(local
, pubsta
);
1315 skb
= alloc_skb(0, GFP_ATOMIC
);
1317 /* too bad ... but race is better than loss */
1318 clear_sta_flag(sta
, WLAN_STA_SP
);
1322 data
= (void *)skb
->cb
;
1323 memcpy(data
->sta
, pubsta
->addr
, ETH_ALEN
);
1324 memcpy(data
->iface
, sta
->sdata
->vif
.addr
, ETH_ALEN
);
1325 skb
->pkt_type
= IEEE80211_EOSP_MSG
;
1326 skb_queue_tail(&local
->skb_queue
, skb
);
1327 tasklet_schedule(&local
->tasklet
);
1329 EXPORT_SYMBOL(ieee80211_sta_eosp_irqsafe
);
1331 void ieee80211_sta_set_buffered(struct ieee80211_sta
*pubsta
,
1332 u8 tid
, bool buffered
)
1334 struct sta_info
*sta
= container_of(pubsta
, struct sta_info
, sta
);
1336 if (WARN_ON(tid
>= STA_TID_NUM
))
1340 set_bit(tid
, &sta
->driver_buffered_tids
);
1342 clear_bit(tid
, &sta
->driver_buffered_tids
);
1344 sta_info_recalc_tim(sta
);
1346 EXPORT_SYMBOL(ieee80211_sta_set_buffered
);
1348 int sta_info_move_state(struct sta_info
*sta
,
1349 enum ieee80211_sta_state new_state
)
1353 if (sta
->sta_state
== new_state
)
1356 /* check allowed transitions first */
1358 switch (new_state
) {
1359 case IEEE80211_STA_NONE
:
1360 if (sta
->sta_state
!= IEEE80211_STA_AUTH
)
1363 case IEEE80211_STA_AUTH
:
1364 if (sta
->sta_state
!= IEEE80211_STA_NONE
&&
1365 sta
->sta_state
!= IEEE80211_STA_ASSOC
)
1368 case IEEE80211_STA_ASSOC
:
1369 if (sta
->sta_state
!= IEEE80211_STA_AUTH
&&
1370 sta
->sta_state
!= IEEE80211_STA_AUTHORIZED
)
1373 case IEEE80211_STA_AUTHORIZED
:
1374 if (sta
->sta_state
!= IEEE80211_STA_ASSOC
)
1378 WARN(1, "invalid state %d", new_state
);
1382 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1383 pr_debug("%s: moving STA %pM to state %d\n",
1384 sta
->sdata
->name
, sta
->sta
.addr
, new_state
);
1388 * notify the driver before the actual changes so it can
1389 * fail the transition
1391 if (test_sta_flag(sta
, WLAN_STA_INSERTED
)) {
1392 int err
= drv_sta_state(sta
->local
, sta
->sdata
, sta
,
1393 sta
->sta_state
, new_state
);
1398 /* reflect the change in all state variables */
1400 switch (new_state
) {
1401 case IEEE80211_STA_NONE
:
1402 if (sta
->sta_state
== IEEE80211_STA_AUTH
)
1403 clear_bit(WLAN_STA_AUTH
, &sta
->_flags
);
1405 case IEEE80211_STA_AUTH
:
1406 if (sta
->sta_state
== IEEE80211_STA_NONE
)
1407 set_bit(WLAN_STA_AUTH
, &sta
->_flags
);
1408 else if (sta
->sta_state
== IEEE80211_STA_ASSOC
)
1409 clear_bit(WLAN_STA_ASSOC
, &sta
->_flags
);
1411 case IEEE80211_STA_ASSOC
:
1412 if (sta
->sta_state
== IEEE80211_STA_AUTH
) {
1413 set_bit(WLAN_STA_ASSOC
, &sta
->_flags
);
1414 } else if (sta
->sta_state
== IEEE80211_STA_AUTHORIZED
) {
1415 if (sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1416 (sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1417 !sta
->sdata
->u
.vlan
.sta
))
1418 atomic_dec(&sta
->sdata
->bss
->num_mcast_sta
);
1419 clear_bit(WLAN_STA_AUTHORIZED
, &sta
->_flags
);
1422 case IEEE80211_STA_AUTHORIZED
:
1423 if (sta
->sta_state
== IEEE80211_STA_ASSOC
) {
1424 if (sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP
||
1425 (sta
->sdata
->vif
.type
== NL80211_IFTYPE_AP_VLAN
&&
1426 !sta
->sdata
->u
.vlan
.sta
))
1427 atomic_inc(&sta
->sdata
->bss
->num_mcast_sta
);
1428 set_bit(WLAN_STA_AUTHORIZED
, &sta
->_flags
);
1435 sta
->sta_state
= new_state
;