mac80211: add pre-RCU-sync sta removal driver operation
[linux-2.6/btrfs-unstable.git] / net / mac80211 / sta_info.c
blob1e147742eccf594421e6d319e1c038394cd94557
1 /*
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.
8 */
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"
24 #include "rate.h"
25 #include "sta_info.h"
26 #include "debugfs_sta.h"
27 #include "mesh.h"
28 #include "wme.h"
30 /**
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
44 * encryption keys.
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,
68 struct sta_info *sta)
70 struct sta_info *s;
72 s = rcu_dereference_protected(local->sta_hash[STA_HASH(sta->sta.addr)],
73 lockdep_is_held(&local->sta_mtx));
74 if (!s)
75 return -ENOENT;
76 if (s == sta) {
77 rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)],
78 s->hnext);
79 return 0;
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);
88 return 0;
91 return -ENOENT;
94 static void cleanup_single_sta(struct sta_info *sta)
96 int ac, i;
97 struct tid_ampdu_tx *tid_tx;
98 struct ieee80211_sub_if_data *sdata = sta->sdata;
99 struct ieee80211_local *local = sdata->local;
100 struct ps_data *ps;
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
112 * the driver.
114 * In station mode, nothing happens here so it doesn't
115 * have to (and doesn't) do that, this is intentional to
116 * speed up roaming.
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;
125 else
126 return;
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]);
154 if (!tid_tx)
155 continue;
156 ieee80211_purge_tx_queue(&local->hw, &tid_tx->pending);
157 kfree(tid_tx);
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,
196 const u8 *addr)
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));
203 while (sta) {
204 if (sta->sdata == sdata &&
205 ether_addr_equal(sta->sta.addr, addr))
206 break;
207 sta = rcu_dereference_check(sta->hnext,
208 lockdep_is_held(&local->sta_mtx));
210 return sta;
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,
218 const u8 *addr)
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));
225 while (sta) {
226 if ((sta->sdata == sdata ||
227 (sta->sdata->bss && sta->sdata->bss == sdata->bss)) &&
228 ether_addr_equal(sta->sta.addr, addr))
229 break;
230 sta = rcu_dereference_check(sta->hnext,
231 lockdep_is_held(&local->sta_mtx));
233 return sta;
236 struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
237 int idx)
239 struct ieee80211_local *local = sdata->local;
240 struct sta_info *sta;
241 int i = 0;
243 list_for_each_entry_rcu(sta, &local->sta_list, list) {
244 if (sdata != sta->sdata)
245 continue;
246 if (i < idx) {
247 ++i;
248 continue;
250 return sta;
253 return NULL;
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)
269 int i;
271 if (sta->rate_ctrl)
272 rate_control_free_sta(sta);
274 if (sta->tx_lat) {
275 for (i = 0; i < IEEE80211_NUM_TIDS; i++)
276 kfree(sta->tx_lat[i].bins);
277 kfree(sta->tx_lat);
280 sta_dbg(sta->sdata, "Destroyed STA %pM\n", sta->sta.addr);
282 kfree(sta);
285 /* Caller must hold local->sta_mtx */
286 static void sta_info_hash_add(struct ieee80211_local *local,
287 struct sta_info *sta)
289 lockdep_assert_held(&local->sta_mtx);
290 sta->hnext = local->sta_hash[STA_HASH(sta->sta.addr)];
291 rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)], sta);
294 static void sta_unblock(struct work_struct *wk)
296 struct sta_info *sta;
298 sta = container_of(wk, struct sta_info, drv_unblock_wk);
300 if (sta->dead)
301 return;
303 if (!test_sta_flag(sta, WLAN_STA_PS_STA)) {
304 local_bh_disable();
305 ieee80211_sta_ps_deliver_wakeup(sta);
306 local_bh_enable();
307 } else if (test_and_clear_sta_flag(sta, WLAN_STA_PSPOLL)) {
308 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
310 local_bh_disable();
311 ieee80211_sta_ps_deliver_poll_response(sta);
312 local_bh_enable();
313 } else if (test_and_clear_sta_flag(sta, WLAN_STA_UAPSD)) {
314 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
316 local_bh_disable();
317 ieee80211_sta_ps_deliver_uapsd(sta);
318 local_bh_enable();
319 } else
320 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
323 static int sta_prepare_rate_control(struct ieee80211_local *local,
324 struct sta_info *sta, gfp_t gfp)
326 if (local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)
327 return 0;
329 sta->rate_ctrl = local->rate_ctrl;
330 sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl,
331 &sta->sta, gfp);
332 if (!sta->rate_ctrl_priv)
333 return -ENOMEM;
335 return 0;
338 struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
339 const u8 *addr, gfp_t gfp)
341 struct ieee80211_local *local = sdata->local;
342 struct sta_info *sta;
343 struct timespec uptime;
344 struct ieee80211_tx_latency_bin_ranges *tx_latency;
345 int i;
347 sta = kzalloc(sizeof(*sta) + local->hw.sta_data_size, gfp);
348 if (!sta)
349 return NULL;
351 spin_lock_init(&sta->lock);
352 INIT_WORK(&sta->drv_unblock_wk, sta_unblock);
353 INIT_WORK(&sta->ampdu_mlme.work, ieee80211_ba_session_work);
354 mutex_init(&sta->ampdu_mlme.mtx);
355 #ifdef CONFIG_MAC80211_MESH
356 if (ieee80211_vif_is_mesh(&sdata->vif) &&
357 !sdata->u.mesh.user_mpm)
358 init_timer(&sta->plink_timer);
359 sta->nonpeer_pm = NL80211_MESH_POWER_ACTIVE;
360 #endif
362 memcpy(sta->sta.addr, addr, ETH_ALEN);
363 sta->local = local;
364 sta->sdata = sdata;
365 sta->last_rx = jiffies;
367 sta->sta_state = IEEE80211_STA_NONE;
369 do_posix_clock_monotonic_gettime(&uptime);
370 sta->last_connected = uptime.tv_sec;
371 ewma_init(&sta->avg_signal, 1024, 8);
372 for (i = 0; i < ARRAY_SIZE(sta->chain_signal_avg); i++)
373 ewma_init(&sta->chain_signal_avg[i], 1024, 8);
375 if (sta_prepare_rate_control(local, sta, gfp)) {
376 kfree(sta);
377 return NULL;
380 for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
382 * timer_to_tid must be initialized with identity mapping
383 * to enable session_timer's data differentiation. See
384 * sta_rx_agg_session_timer_expired for usage.
386 sta->timer_to_tid[i] = i;
388 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
389 skb_queue_head_init(&sta->ps_tx_buf[i]);
390 skb_queue_head_init(&sta->tx_filtered[i]);
393 for (i = 0; i < IEEE80211_NUM_TIDS; i++)
394 sta->last_seq_ctrl[i] = cpu_to_le16(USHRT_MAX);
396 sta->sta.smps_mode = IEEE80211_SMPS_OFF;
397 if (sdata->vif.type == NL80211_IFTYPE_AP ||
398 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
399 struct ieee80211_supported_band *sband =
400 local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
401 u8 smps = (sband->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >>
402 IEEE80211_HT_CAP_SM_PS_SHIFT;
404 * Assume that hostapd advertises our caps in the beacon and
405 * this is the known_smps_mode for a station that just assciated
407 switch (smps) {
408 case WLAN_HT_SMPS_CONTROL_DISABLED:
409 sta->known_smps_mode = IEEE80211_SMPS_OFF;
410 break;
411 case WLAN_HT_SMPS_CONTROL_STATIC:
412 sta->known_smps_mode = IEEE80211_SMPS_STATIC;
413 break;
414 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
415 sta->known_smps_mode = IEEE80211_SMPS_DYNAMIC;
416 break;
417 default:
418 WARN_ON(1);
422 rcu_read_lock();
424 tx_latency = rcu_dereference(local->tx_latency);
425 /* init stations Tx latency statistics && TID bins */
426 if (tx_latency)
427 sta->tx_lat = kzalloc(IEEE80211_NUM_TIDS *
428 sizeof(struct ieee80211_tx_latency_stat),
429 GFP_ATOMIC);
432 * if Tx latency and bins are enabled and the previous allocation
433 * succeeded
435 if (tx_latency && tx_latency->n_ranges && sta->tx_lat)
436 for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
437 /* size of bins is size of the ranges +1 */
438 sta->tx_lat[i].bin_count =
439 tx_latency->n_ranges + 1;
440 sta->tx_lat[i].bins = kcalloc(sta->tx_lat[i].bin_count,
441 sizeof(u32),
442 GFP_ATOMIC);
445 rcu_read_unlock();
447 sta_dbg(sdata, "Allocated STA %pM\n", sta->sta.addr);
449 return sta;
452 static int sta_info_insert_check(struct sta_info *sta)
454 struct ieee80211_sub_if_data *sdata = sta->sdata;
457 * Can't be a WARN_ON because it can be triggered through a race:
458 * something inserts a STA (on one CPU) without holding the RTNL
459 * and another CPU turns off the net device.
461 if (unlikely(!ieee80211_sdata_running(sdata)))
462 return -ENETDOWN;
464 if (WARN_ON(ether_addr_equal(sta->sta.addr, sdata->vif.addr) ||
465 is_multicast_ether_addr(sta->sta.addr)))
466 return -EINVAL;
468 return 0;
471 static int sta_info_insert_drv_state(struct ieee80211_local *local,
472 struct ieee80211_sub_if_data *sdata,
473 struct sta_info *sta)
475 enum ieee80211_sta_state state;
476 int err = 0;
478 for (state = IEEE80211_STA_NOTEXIST; state < sta->sta_state; state++) {
479 err = drv_sta_state(local, sdata, sta, state, state + 1);
480 if (err)
481 break;
484 if (!err) {
486 * Drivers using legacy sta_add/sta_remove callbacks only
487 * get uploaded set to true after sta_add is called.
489 if (!local->ops->sta_add)
490 sta->uploaded = true;
491 return 0;
494 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
495 sdata_info(sdata,
496 "failed to move IBSS STA %pM to state %d (%d) - keeping it anyway\n",
497 sta->sta.addr, state + 1, err);
498 err = 0;
501 /* unwind on error */
502 for (; state > IEEE80211_STA_NOTEXIST; state--)
503 WARN_ON(drv_sta_state(local, sdata, sta, state, state - 1));
505 return err;
509 * should be called with sta_mtx locked
510 * this function replaces the mutex lock
511 * with a RCU lock
513 static int sta_info_insert_finish(struct sta_info *sta) __acquires(RCU)
515 struct ieee80211_local *local = sta->local;
516 struct ieee80211_sub_if_data *sdata = sta->sdata;
517 struct station_info sinfo;
518 int err = 0;
520 lockdep_assert_held(&local->sta_mtx);
522 /* check if STA exists already */
523 if (sta_info_get_bss(sdata, sta->sta.addr)) {
524 err = -EEXIST;
525 goto out_err;
528 /* notify driver */
529 err = sta_info_insert_drv_state(local, sdata, sta);
530 if (err)
531 goto out_err;
533 local->num_sta++;
534 local->sta_generation++;
535 smp_mb();
537 /* make the station visible */
538 sta_info_hash_add(local, sta);
540 list_add_rcu(&sta->list, &local->sta_list);
542 set_sta_flag(sta, WLAN_STA_INSERTED);
544 ieee80211_recalc_min_chandef(sdata);
545 ieee80211_sta_debugfs_add(sta);
546 rate_control_add_sta_debugfs(sta);
548 memset(&sinfo, 0, sizeof(sinfo));
549 sinfo.filled = 0;
550 sinfo.generation = local->sta_generation;
551 cfg80211_new_sta(sdata->dev, sta->sta.addr, &sinfo, GFP_KERNEL);
553 sta_dbg(sdata, "Inserted STA %pM\n", sta->sta.addr);
555 /* move reference to rcu-protected */
556 rcu_read_lock();
557 mutex_unlock(&local->sta_mtx);
559 if (ieee80211_vif_is_mesh(&sdata->vif))
560 mesh_accept_plinks_update(sdata);
562 return 0;
563 out_err:
564 mutex_unlock(&local->sta_mtx);
565 rcu_read_lock();
566 return err;
569 int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU)
571 struct ieee80211_local *local = sta->local;
572 int err = 0;
574 might_sleep();
576 err = sta_info_insert_check(sta);
577 if (err) {
578 rcu_read_lock();
579 goto out_free;
582 mutex_lock(&local->sta_mtx);
584 err = sta_info_insert_finish(sta);
585 if (err)
586 goto out_free;
588 return 0;
589 out_free:
590 BUG_ON(!err);
591 sta_info_free(local, sta);
592 return err;
595 int sta_info_insert(struct sta_info *sta)
597 int err = sta_info_insert_rcu(sta);
599 rcu_read_unlock();
601 return err;
604 static inline void __bss_tim_set(u8 *tim, u16 id)
607 * This format has been mandated by the IEEE specifications,
608 * so this line may not be changed to use the __set_bit() format.
610 tim[id / 8] |= (1 << (id % 8));
613 static inline void __bss_tim_clear(u8 *tim, u16 id)
616 * This format has been mandated by the IEEE specifications,
617 * so this line may not be changed to use the __clear_bit() format.
619 tim[id / 8] &= ~(1 << (id % 8));
622 static inline bool __bss_tim_get(u8 *tim, u16 id)
625 * This format has been mandated by the IEEE specifications,
626 * so this line may not be changed to use the test_bit() format.
628 return tim[id / 8] & (1 << (id % 8));
631 static unsigned long ieee80211_tids_for_ac(int ac)
633 /* If we ever support TIDs > 7, this obviously needs to be adjusted */
634 switch (ac) {
635 case IEEE80211_AC_VO:
636 return BIT(6) | BIT(7);
637 case IEEE80211_AC_VI:
638 return BIT(4) | BIT(5);
639 case IEEE80211_AC_BE:
640 return BIT(0) | BIT(3);
641 case IEEE80211_AC_BK:
642 return BIT(1) | BIT(2);
643 default:
644 WARN_ON(1);
645 return 0;
649 void sta_info_recalc_tim(struct sta_info *sta)
651 struct ieee80211_local *local = sta->local;
652 struct ps_data *ps;
653 bool indicate_tim = false;
654 u8 ignore_for_tim = sta->sta.uapsd_queues;
655 int ac;
656 u16 id;
658 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
659 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
660 if (WARN_ON_ONCE(!sta->sdata->bss))
661 return;
663 ps = &sta->sdata->bss->ps;
664 id = sta->sta.aid;
665 #ifdef CONFIG_MAC80211_MESH
666 } else if (ieee80211_vif_is_mesh(&sta->sdata->vif)) {
667 ps = &sta->sdata->u.mesh.ps;
668 /* TIM map only for 1 <= PLID <= IEEE80211_MAX_AID */
669 id = sta->plid % (IEEE80211_MAX_AID + 1);
670 #endif
671 } else {
672 return;
675 /* No need to do anything if the driver does all */
676 if (local->hw.flags & IEEE80211_HW_AP_LINK_PS)
677 return;
679 if (sta->dead)
680 goto done;
683 * If all ACs are delivery-enabled then we should build
684 * the TIM bit for all ACs anyway; if only some are then
685 * we ignore those and build the TIM bit using only the
686 * non-enabled ones.
688 if (ignore_for_tim == BIT(IEEE80211_NUM_ACS) - 1)
689 ignore_for_tim = 0;
691 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
692 unsigned long tids;
694 if (ignore_for_tim & BIT(ac))
695 continue;
697 indicate_tim |= !skb_queue_empty(&sta->tx_filtered[ac]) ||
698 !skb_queue_empty(&sta->ps_tx_buf[ac]);
699 if (indicate_tim)
700 break;
702 tids = ieee80211_tids_for_ac(ac);
704 indicate_tim |=
705 sta->driver_buffered_tids & tids;
708 done:
709 spin_lock_bh(&local->tim_lock);
711 if (indicate_tim == __bss_tim_get(ps->tim, id))
712 goto out_unlock;
714 if (indicate_tim)
715 __bss_tim_set(ps->tim, id);
716 else
717 __bss_tim_clear(ps->tim, id);
719 if (local->ops->set_tim) {
720 local->tim_in_locked_section = true;
721 drv_set_tim(local, &sta->sta, indicate_tim);
722 local->tim_in_locked_section = false;
725 out_unlock:
726 spin_unlock_bh(&local->tim_lock);
729 static bool sta_info_buffer_expired(struct sta_info *sta, struct sk_buff *skb)
731 struct ieee80211_tx_info *info;
732 int timeout;
734 if (!skb)
735 return false;
737 info = IEEE80211_SKB_CB(skb);
739 /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
740 timeout = (sta->listen_interval *
741 sta->sdata->vif.bss_conf.beacon_int *
742 32 / 15625) * HZ;
743 if (timeout < STA_TX_BUFFER_EXPIRE)
744 timeout = STA_TX_BUFFER_EXPIRE;
745 return time_after(jiffies, info->control.jiffies + timeout);
749 static bool sta_info_cleanup_expire_buffered_ac(struct ieee80211_local *local,
750 struct sta_info *sta, int ac)
752 unsigned long flags;
753 struct sk_buff *skb;
756 * First check for frames that should expire on the filtered
757 * queue. Frames here were rejected by the driver and are on
758 * a separate queue to avoid reordering with normal PS-buffered
759 * frames. They also aren't accounted for right now in the
760 * total_ps_buffered counter.
762 for (;;) {
763 spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
764 skb = skb_peek(&sta->tx_filtered[ac]);
765 if (sta_info_buffer_expired(sta, skb))
766 skb = __skb_dequeue(&sta->tx_filtered[ac]);
767 else
768 skb = NULL;
769 spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
772 * Frames are queued in order, so if this one
773 * hasn't expired yet we can stop testing. If
774 * we actually reached the end of the queue we
775 * also need to stop, of course.
777 if (!skb)
778 break;
779 ieee80211_free_txskb(&local->hw, skb);
783 * Now also check the normal PS-buffered queue, this will
784 * only find something if the filtered queue was emptied
785 * since the filtered frames are all before the normal PS
786 * buffered frames.
788 for (;;) {
789 spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
790 skb = skb_peek(&sta->ps_tx_buf[ac]);
791 if (sta_info_buffer_expired(sta, skb))
792 skb = __skb_dequeue(&sta->ps_tx_buf[ac]);
793 else
794 skb = NULL;
795 spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
798 * frames are queued in order, so if this one
799 * hasn't expired yet (or we reached the end of
800 * the queue) we can stop testing
802 if (!skb)
803 break;
805 local->total_ps_buffered--;
806 ps_dbg(sta->sdata, "Buffered frame expired (STA %pM)\n",
807 sta->sta.addr);
808 ieee80211_free_txskb(&local->hw, skb);
812 * Finally, recalculate the TIM bit for this station -- it might
813 * now be clear because the station was too slow to retrieve its
814 * frames.
816 sta_info_recalc_tim(sta);
819 * Return whether there are any frames still buffered, this is
820 * used to check whether the cleanup timer still needs to run,
821 * if there are no frames we don't need to rearm the timer.
823 return !(skb_queue_empty(&sta->ps_tx_buf[ac]) &&
824 skb_queue_empty(&sta->tx_filtered[ac]));
827 static bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
828 struct sta_info *sta)
830 bool have_buffered = false;
831 int ac;
833 /* This is only necessary for stations on BSS/MBSS interfaces */
834 if (!sta->sdata->bss &&
835 !ieee80211_vif_is_mesh(&sta->sdata->vif))
836 return false;
838 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
839 have_buffered |=
840 sta_info_cleanup_expire_buffered_ac(local, sta, ac);
842 return have_buffered;
845 int __must_check __sta_info_destroy(struct sta_info *sta)
847 struct ieee80211_local *local;
848 struct ieee80211_sub_if_data *sdata;
849 int ret;
851 might_sleep();
853 if (!sta)
854 return -ENOENT;
856 local = sta->local;
857 sdata = sta->sdata;
859 lockdep_assert_held(&local->sta_mtx);
862 * Before removing the station from the driver and
863 * rate control, it might still start new aggregation
864 * sessions -- block that to make sure the tear-down
865 * will be sufficient.
867 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
868 ieee80211_sta_tear_down_BA_sessions(sta, AGG_STOP_DESTROY_STA);
870 ret = sta_info_hash_del(local, sta);
871 if (WARN_ON(ret))
872 return ret;
874 list_del_rcu(&sta->list);
876 drv_sta_pre_rcu_remove(local, sta->sdata, sta);
878 /* this always calls synchronize_net() */
879 ieee80211_free_sta_keys(local, sta);
881 sta->dead = true;
883 local->num_sta--;
884 local->sta_generation++;
886 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
887 RCU_INIT_POINTER(sdata->u.vlan.sta, NULL);
889 while (sta->sta_state > IEEE80211_STA_NONE) {
890 ret = sta_info_move_state(sta, sta->sta_state - 1);
891 if (ret) {
892 WARN_ON_ONCE(1);
893 break;
897 if (sta->uploaded) {
898 ret = drv_sta_state(local, sdata, sta, IEEE80211_STA_NONE,
899 IEEE80211_STA_NOTEXIST);
900 WARN_ON_ONCE(ret != 0);
903 sta_dbg(sdata, "Removed STA %pM\n", sta->sta.addr);
905 cfg80211_del_sta(sdata->dev, sta->sta.addr, GFP_KERNEL);
907 rate_control_remove_sta_debugfs(sta);
908 ieee80211_sta_debugfs_remove(sta);
909 ieee80211_recalc_min_chandef(sdata);
911 call_rcu(&sta->rcu_head, free_sta_rcu);
913 return 0;
916 int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, const u8 *addr)
918 struct sta_info *sta;
919 int ret;
921 mutex_lock(&sdata->local->sta_mtx);
922 sta = sta_info_get(sdata, addr);
923 ret = __sta_info_destroy(sta);
924 mutex_unlock(&sdata->local->sta_mtx);
926 return ret;
929 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
930 const u8 *addr)
932 struct sta_info *sta;
933 int ret;
935 mutex_lock(&sdata->local->sta_mtx);
936 sta = sta_info_get_bss(sdata, addr);
937 ret = __sta_info_destroy(sta);
938 mutex_unlock(&sdata->local->sta_mtx);
940 return ret;
943 static void sta_info_cleanup(unsigned long data)
945 struct ieee80211_local *local = (struct ieee80211_local *) data;
946 struct sta_info *sta;
947 bool timer_needed = false;
949 rcu_read_lock();
950 list_for_each_entry_rcu(sta, &local->sta_list, list)
951 if (sta_info_cleanup_expire_buffered(local, sta))
952 timer_needed = true;
953 rcu_read_unlock();
955 if (local->quiescing)
956 return;
958 if (!timer_needed)
959 return;
961 mod_timer(&local->sta_cleanup,
962 round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL));
965 void sta_info_init(struct ieee80211_local *local)
967 spin_lock_init(&local->tim_lock);
968 mutex_init(&local->sta_mtx);
969 INIT_LIST_HEAD(&local->sta_list);
971 setup_timer(&local->sta_cleanup, sta_info_cleanup,
972 (unsigned long)local);
975 void sta_info_stop(struct ieee80211_local *local)
977 del_timer_sync(&local->sta_cleanup);
981 int sta_info_flush_defer(struct ieee80211_sub_if_data *sdata)
983 struct ieee80211_local *local = sdata->local;
984 struct sta_info *sta, *tmp;
985 int ret = 0;
987 might_sleep();
989 mutex_lock(&local->sta_mtx);
990 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
991 if (sdata == sta->sdata) {
992 WARN_ON(__sta_info_destroy(sta));
993 ret++;
996 mutex_unlock(&local->sta_mtx);
998 return ret;
1001 void sta_info_flush_cleanup(struct ieee80211_sub_if_data *sdata)
1003 ieee80211_cleanup_sdata_stas(sdata);
1004 cancel_work_sync(&sdata->cleanup_stations_wk);
1007 void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
1008 unsigned long exp_time)
1010 struct ieee80211_local *local = sdata->local;
1011 struct sta_info *sta, *tmp;
1013 mutex_lock(&local->sta_mtx);
1015 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1016 if (sdata != sta->sdata)
1017 continue;
1019 if (time_after(jiffies, sta->last_rx + exp_time)) {
1020 sta_dbg(sta->sdata, "expiring inactive STA %pM\n",
1021 sta->sta.addr);
1023 if (ieee80211_vif_is_mesh(&sdata->vif) &&
1024 test_sta_flag(sta, WLAN_STA_PS_STA))
1025 atomic_dec(&sdata->u.mesh.ps.num_sta_ps);
1027 WARN_ON(__sta_info_destroy(sta));
1031 mutex_unlock(&local->sta_mtx);
1034 struct ieee80211_sta *ieee80211_find_sta_by_ifaddr(struct ieee80211_hw *hw,
1035 const u8 *addr,
1036 const u8 *localaddr)
1038 struct sta_info *sta, *nxt;
1041 * Just return a random station if localaddr is NULL
1042 * ... first in list.
1044 for_each_sta_info(hw_to_local(hw), addr, sta, nxt) {
1045 if (localaddr &&
1046 !ether_addr_equal(sta->sdata->vif.addr, localaddr))
1047 continue;
1048 if (!sta->uploaded)
1049 return NULL;
1050 return &sta->sta;
1053 return NULL;
1055 EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr);
1057 struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif,
1058 const u8 *addr)
1060 struct sta_info *sta;
1062 if (!vif)
1063 return NULL;
1065 sta = sta_info_get_bss(vif_to_sdata(vif), addr);
1066 if (!sta)
1067 return NULL;
1069 if (!sta->uploaded)
1070 return NULL;
1072 return &sta->sta;
1074 EXPORT_SYMBOL(ieee80211_find_sta);
1076 static void clear_sta_ps_flags(void *_sta)
1078 struct sta_info *sta = _sta;
1079 struct ieee80211_sub_if_data *sdata = sta->sdata;
1080 struct ps_data *ps;
1082 if (sdata->vif.type == NL80211_IFTYPE_AP ||
1083 sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1084 ps = &sdata->bss->ps;
1085 else if (ieee80211_vif_is_mesh(&sdata->vif))
1086 ps = &sdata->u.mesh.ps;
1087 else
1088 return;
1090 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
1091 if (test_and_clear_sta_flag(sta, WLAN_STA_PS_STA))
1092 atomic_dec(&ps->num_sta_ps);
1095 /* powersave support code */
1096 void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta)
1098 struct ieee80211_sub_if_data *sdata = sta->sdata;
1099 struct ieee80211_local *local = sdata->local;
1100 struct sk_buff_head pending;
1101 int filtered = 0, buffered = 0, ac;
1102 unsigned long flags;
1104 clear_sta_flag(sta, WLAN_STA_SP);
1106 BUILD_BUG_ON(BITS_TO_LONGS(IEEE80211_NUM_TIDS) > 1);
1107 sta->driver_buffered_tids = 0;
1109 if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1110 drv_sta_notify(local, sdata, STA_NOTIFY_AWAKE, &sta->sta);
1112 skb_queue_head_init(&pending);
1114 /* Send all buffered frames to the station */
1115 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1116 int count = skb_queue_len(&pending), tmp;
1118 spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
1119 skb_queue_splice_tail_init(&sta->tx_filtered[ac], &pending);
1120 spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
1121 tmp = skb_queue_len(&pending);
1122 filtered += tmp - count;
1123 count = tmp;
1125 spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
1126 skb_queue_splice_tail_init(&sta->ps_tx_buf[ac], &pending);
1127 spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
1128 tmp = skb_queue_len(&pending);
1129 buffered += tmp - count;
1132 ieee80211_add_pending_skbs_fn(local, &pending, clear_sta_ps_flags, sta);
1134 /* This station just woke up and isn't aware of our SMPS state */
1135 if (!ieee80211_smps_is_restrictive(sta->known_smps_mode,
1136 sdata->smps_mode) &&
1137 sta->known_smps_mode != sdata->bss->req_smps &&
1138 sta_info_tx_streams(sta) != 1) {
1139 ht_dbg(sdata,
1140 "%pM just woke up and MIMO capable - update SMPS\n",
1141 sta->sta.addr);
1142 ieee80211_send_smps_action(sdata, sdata->bss->req_smps,
1143 sta->sta.addr,
1144 sdata->vif.bss_conf.bssid);
1147 local->total_ps_buffered -= buffered;
1149 sta_info_recalc_tim(sta);
1151 ps_dbg(sdata,
1152 "STA %pM aid %d sending %d filtered/%d PS frames since STA not sleeping anymore\n",
1153 sta->sta.addr, sta->sta.aid, filtered, buffered);
1156 static void ieee80211_send_null_response(struct ieee80211_sub_if_data *sdata,
1157 struct sta_info *sta, int tid,
1158 enum ieee80211_frame_release_type reason)
1160 struct ieee80211_local *local = sdata->local;
1161 struct ieee80211_qos_hdr *nullfunc;
1162 struct sk_buff *skb;
1163 int size = sizeof(*nullfunc);
1164 __le16 fc;
1165 bool qos = test_sta_flag(sta, WLAN_STA_WME);
1166 struct ieee80211_tx_info *info;
1167 struct ieee80211_chanctx_conf *chanctx_conf;
1169 if (qos) {
1170 fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1171 IEEE80211_STYPE_QOS_NULLFUNC |
1172 IEEE80211_FCTL_FROMDS);
1173 } else {
1174 size -= 2;
1175 fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1176 IEEE80211_STYPE_NULLFUNC |
1177 IEEE80211_FCTL_FROMDS);
1180 skb = dev_alloc_skb(local->hw.extra_tx_headroom + size);
1181 if (!skb)
1182 return;
1184 skb_reserve(skb, local->hw.extra_tx_headroom);
1186 nullfunc = (void *) skb_put(skb, size);
1187 nullfunc->frame_control = fc;
1188 nullfunc->duration_id = 0;
1189 memcpy(nullfunc->addr1, sta->sta.addr, ETH_ALEN);
1190 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
1191 memcpy(nullfunc->addr3, sdata->vif.addr, ETH_ALEN);
1193 skb->priority = tid;
1194 skb_set_queue_mapping(skb, ieee802_1d_to_ac[tid]);
1195 if (qos) {
1196 nullfunc->qos_ctrl = cpu_to_le16(tid);
1198 if (reason == IEEE80211_FRAME_RELEASE_UAPSD)
1199 nullfunc->qos_ctrl |=
1200 cpu_to_le16(IEEE80211_QOS_CTL_EOSP);
1203 info = IEEE80211_SKB_CB(skb);
1206 * Tell TX path to send this frame even though the
1207 * STA may still remain is PS mode after this frame
1208 * exchange. Also set EOSP to indicate this packet
1209 * ends the poll/service period.
1211 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER |
1212 IEEE80211_TX_CTL_PS_RESPONSE |
1213 IEEE80211_TX_STATUS_EOSP |
1214 IEEE80211_TX_CTL_REQ_TX_STATUS;
1216 drv_allow_buffered_frames(local, sta, BIT(tid), 1, reason, false);
1218 skb->dev = sdata->dev;
1220 rcu_read_lock();
1221 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1222 if (WARN_ON(!chanctx_conf)) {
1223 rcu_read_unlock();
1224 kfree_skb(skb);
1225 return;
1228 ieee80211_xmit(sdata, skb, chanctx_conf->def.chan->band);
1229 rcu_read_unlock();
1232 static void
1233 ieee80211_sta_ps_deliver_response(struct sta_info *sta,
1234 int n_frames, u8 ignored_acs,
1235 enum ieee80211_frame_release_type reason)
1237 struct ieee80211_sub_if_data *sdata = sta->sdata;
1238 struct ieee80211_local *local = sdata->local;
1239 bool found = false;
1240 bool more_data = false;
1241 int ac;
1242 unsigned long driver_release_tids = 0;
1243 struct sk_buff_head frames;
1245 /* Service or PS-Poll period starts */
1246 set_sta_flag(sta, WLAN_STA_SP);
1248 __skb_queue_head_init(&frames);
1251 * Get response frame(s) and more data bit for it.
1253 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1254 unsigned long tids;
1256 if (ignored_acs & BIT(ac))
1257 continue;
1259 tids = ieee80211_tids_for_ac(ac);
1261 if (!found) {
1262 driver_release_tids = sta->driver_buffered_tids & tids;
1263 if (driver_release_tids) {
1264 found = true;
1265 } else {
1266 struct sk_buff *skb;
1268 while (n_frames > 0) {
1269 skb = skb_dequeue(&sta->tx_filtered[ac]);
1270 if (!skb) {
1271 skb = skb_dequeue(
1272 &sta->ps_tx_buf[ac]);
1273 if (skb)
1274 local->total_ps_buffered--;
1276 if (!skb)
1277 break;
1278 n_frames--;
1279 found = true;
1280 __skb_queue_tail(&frames, skb);
1285 * If the driver has data on more than one TID then
1286 * certainly there's more data if we release just a
1287 * single frame now (from a single TID).
1289 if (reason == IEEE80211_FRAME_RELEASE_PSPOLL &&
1290 hweight16(driver_release_tids) > 1) {
1291 more_data = true;
1292 driver_release_tids =
1293 BIT(ffs(driver_release_tids) - 1);
1294 break;
1298 if (!skb_queue_empty(&sta->tx_filtered[ac]) ||
1299 !skb_queue_empty(&sta->ps_tx_buf[ac])) {
1300 more_data = true;
1301 break;
1305 if (!found) {
1306 int tid;
1309 * For PS-Poll, this can only happen due to a race condition
1310 * when we set the TIM bit and the station notices it, but
1311 * before it can poll for the frame we expire it.
1313 * For uAPSD, this is said in the standard (11.2.1.5 h):
1314 * At each unscheduled SP for a non-AP STA, the AP shall
1315 * attempt to transmit at least one MSDU or MMPDU, but no
1316 * more than the value specified in the Max SP Length field
1317 * in the QoS Capability element from delivery-enabled ACs,
1318 * that are destined for the non-AP STA.
1320 * Since we have no other MSDU/MMPDU, transmit a QoS null frame.
1323 /* This will evaluate to 1, 3, 5 or 7. */
1324 tid = 7 - ((ffs(~ignored_acs) - 1) << 1);
1326 ieee80211_send_null_response(sdata, sta, tid, reason);
1327 return;
1330 if (!driver_release_tids) {
1331 struct sk_buff_head pending;
1332 struct sk_buff *skb;
1333 int num = 0;
1334 u16 tids = 0;
1336 skb_queue_head_init(&pending);
1338 while ((skb = __skb_dequeue(&frames))) {
1339 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1340 struct ieee80211_hdr *hdr = (void *) skb->data;
1341 u8 *qoshdr = NULL;
1343 num++;
1346 * Tell TX path to send this frame even though the
1347 * STA may still remain is PS mode after this frame
1348 * exchange.
1350 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER |
1351 IEEE80211_TX_CTL_PS_RESPONSE;
1354 * Use MoreData flag to indicate whether there are
1355 * more buffered frames for this STA
1357 if (more_data || !skb_queue_empty(&frames))
1358 hdr->frame_control |=
1359 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1360 else
1361 hdr->frame_control &=
1362 cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
1364 if (ieee80211_is_data_qos(hdr->frame_control) ||
1365 ieee80211_is_qos_nullfunc(hdr->frame_control))
1366 qoshdr = ieee80211_get_qos_ctl(hdr);
1368 /* end service period after last frame */
1369 if (skb_queue_empty(&frames)) {
1370 if (reason == IEEE80211_FRAME_RELEASE_UAPSD &&
1371 qoshdr)
1372 *qoshdr |= IEEE80211_QOS_CTL_EOSP;
1374 info->flags |= IEEE80211_TX_STATUS_EOSP |
1375 IEEE80211_TX_CTL_REQ_TX_STATUS;
1378 if (qoshdr)
1379 tids |= BIT(*qoshdr & IEEE80211_QOS_CTL_TID_MASK);
1380 else
1381 tids |= BIT(0);
1383 __skb_queue_tail(&pending, skb);
1386 drv_allow_buffered_frames(local, sta, tids, num,
1387 reason, more_data);
1389 ieee80211_add_pending_skbs(local, &pending);
1391 sta_info_recalc_tim(sta);
1392 } else {
1394 * We need to release a frame that is buffered somewhere in the
1395 * driver ... it'll have to handle that.
1396 * Note that, as per the comment above, it'll also have to see
1397 * if there is more than just one frame on the specific TID that
1398 * we're releasing from, and it needs to set the more-data bit
1399 * accordingly if we tell it that there's no more data. If we do
1400 * tell it there's more data, then of course the more-data bit
1401 * needs to be set anyway.
1403 drv_release_buffered_frames(local, sta, driver_release_tids,
1404 n_frames, reason, more_data);
1407 * Note that we don't recalculate the TIM bit here as it would
1408 * most likely have no effect at all unless the driver told us
1409 * that the TID became empty before returning here from the
1410 * release function.
1411 * Either way, however, when the driver tells us that the TID
1412 * became empty we'll do the TIM recalculation.
1417 void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta)
1419 u8 ignore_for_response = sta->sta.uapsd_queues;
1422 * If all ACs are delivery-enabled then we should reply
1423 * from any of them, if only some are enabled we reply
1424 * only from the non-enabled ones.
1426 if (ignore_for_response == BIT(IEEE80211_NUM_ACS) - 1)
1427 ignore_for_response = 0;
1429 ieee80211_sta_ps_deliver_response(sta, 1, ignore_for_response,
1430 IEEE80211_FRAME_RELEASE_PSPOLL);
1433 void ieee80211_sta_ps_deliver_uapsd(struct sta_info *sta)
1435 int n_frames = sta->sta.max_sp;
1436 u8 delivery_enabled = sta->sta.uapsd_queues;
1439 * If we ever grow support for TSPEC this might happen if
1440 * the TSPEC update from hostapd comes in between a trigger
1441 * frame setting WLAN_STA_UAPSD in the RX path and this
1442 * actually getting called.
1444 if (!delivery_enabled)
1445 return;
1447 switch (sta->sta.max_sp) {
1448 case 1:
1449 n_frames = 2;
1450 break;
1451 case 2:
1452 n_frames = 4;
1453 break;
1454 case 3:
1455 n_frames = 6;
1456 break;
1457 case 0:
1458 /* XXX: what is a good value? */
1459 n_frames = 8;
1460 break;
1463 ieee80211_sta_ps_deliver_response(sta, n_frames, ~delivery_enabled,
1464 IEEE80211_FRAME_RELEASE_UAPSD);
1467 void ieee80211_sta_block_awake(struct ieee80211_hw *hw,
1468 struct ieee80211_sta *pubsta, bool block)
1470 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1472 trace_api_sta_block_awake(sta->local, pubsta, block);
1474 if (block)
1475 set_sta_flag(sta, WLAN_STA_PS_DRIVER);
1476 else if (test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1477 ieee80211_queue_work(hw, &sta->drv_unblock_wk);
1479 EXPORT_SYMBOL(ieee80211_sta_block_awake);
1481 void ieee80211_sta_eosp(struct ieee80211_sta *pubsta)
1483 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1484 struct ieee80211_local *local = sta->local;
1486 trace_api_eosp(local, pubsta);
1488 clear_sta_flag(sta, WLAN_STA_SP);
1490 EXPORT_SYMBOL(ieee80211_sta_eosp);
1492 void ieee80211_sta_set_buffered(struct ieee80211_sta *pubsta,
1493 u8 tid, bool buffered)
1495 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1497 if (WARN_ON(tid >= IEEE80211_NUM_TIDS))
1498 return;
1500 if (buffered)
1501 set_bit(tid, &sta->driver_buffered_tids);
1502 else
1503 clear_bit(tid, &sta->driver_buffered_tids);
1505 sta_info_recalc_tim(sta);
1507 EXPORT_SYMBOL(ieee80211_sta_set_buffered);
1509 int sta_info_move_state(struct sta_info *sta,
1510 enum ieee80211_sta_state new_state)
1512 might_sleep();
1514 if (sta->sta_state == new_state)
1515 return 0;
1517 /* check allowed transitions first */
1519 switch (new_state) {
1520 case IEEE80211_STA_NONE:
1521 if (sta->sta_state != IEEE80211_STA_AUTH)
1522 return -EINVAL;
1523 break;
1524 case IEEE80211_STA_AUTH:
1525 if (sta->sta_state != IEEE80211_STA_NONE &&
1526 sta->sta_state != IEEE80211_STA_ASSOC)
1527 return -EINVAL;
1528 break;
1529 case IEEE80211_STA_ASSOC:
1530 if (sta->sta_state != IEEE80211_STA_AUTH &&
1531 sta->sta_state != IEEE80211_STA_AUTHORIZED)
1532 return -EINVAL;
1533 break;
1534 case IEEE80211_STA_AUTHORIZED:
1535 if (sta->sta_state != IEEE80211_STA_ASSOC)
1536 return -EINVAL;
1537 break;
1538 default:
1539 WARN(1, "invalid state %d", new_state);
1540 return -EINVAL;
1543 sta_dbg(sta->sdata, "moving STA %pM to state %d\n",
1544 sta->sta.addr, new_state);
1547 * notify the driver before the actual changes so it can
1548 * fail the transition
1550 if (test_sta_flag(sta, WLAN_STA_INSERTED)) {
1551 int err = drv_sta_state(sta->local, sta->sdata, sta,
1552 sta->sta_state, new_state);
1553 if (err)
1554 return err;
1557 /* reflect the change in all state variables */
1559 switch (new_state) {
1560 case IEEE80211_STA_NONE:
1561 if (sta->sta_state == IEEE80211_STA_AUTH)
1562 clear_bit(WLAN_STA_AUTH, &sta->_flags);
1563 break;
1564 case IEEE80211_STA_AUTH:
1565 if (sta->sta_state == IEEE80211_STA_NONE)
1566 set_bit(WLAN_STA_AUTH, &sta->_flags);
1567 else if (sta->sta_state == IEEE80211_STA_ASSOC)
1568 clear_bit(WLAN_STA_ASSOC, &sta->_flags);
1569 break;
1570 case IEEE80211_STA_ASSOC:
1571 if (sta->sta_state == IEEE80211_STA_AUTH) {
1572 set_bit(WLAN_STA_ASSOC, &sta->_flags);
1573 } else if (sta->sta_state == IEEE80211_STA_AUTHORIZED) {
1574 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1575 (sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1576 !sta->sdata->u.vlan.sta))
1577 atomic_dec(&sta->sdata->bss->num_mcast_sta);
1578 clear_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
1580 break;
1581 case IEEE80211_STA_AUTHORIZED:
1582 if (sta->sta_state == IEEE80211_STA_ASSOC) {
1583 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1584 (sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1585 !sta->sdata->u.vlan.sta))
1586 atomic_inc(&sta->sdata->bss->num_mcast_sta);
1587 set_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
1589 break;
1590 default:
1591 break;
1594 sta->sta_state = new_state;
1596 return 0;
1599 u8 sta_info_tx_streams(struct sta_info *sta)
1601 struct ieee80211_sta_ht_cap *ht_cap = &sta->sta.ht_cap;
1602 u8 rx_streams;
1604 if (!sta->sta.ht_cap.ht_supported)
1605 return 1;
1607 if (sta->sta.vht_cap.vht_supported) {
1608 int i;
1609 u16 tx_mcs_map =
1610 le16_to_cpu(sta->sta.vht_cap.vht_mcs.tx_mcs_map);
1612 for (i = 7; i >= 0; i--)
1613 if ((tx_mcs_map & (0x3 << (i * 2))) !=
1614 IEEE80211_VHT_MCS_NOT_SUPPORTED)
1615 return i + 1;
1618 if (ht_cap->mcs.rx_mask[3])
1619 rx_streams = 4;
1620 else if (ht_cap->mcs.rx_mask[2])
1621 rx_streams = 3;
1622 else if (ht_cap->mcs.rx_mask[1])
1623 rx_streams = 2;
1624 else
1625 rx_streams = 1;
1627 if (!(ht_cap->mcs.tx_params & IEEE80211_HT_MCS_TX_RX_DIFF))
1628 return rx_streams;
1630 return ((ht_cap->mcs.tx_params & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
1631 >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1;