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CommitLineData
f0706e82
JB
1/*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
4 *
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 */
9
10#include <linux/module.h>
11#include <linux/init.h>
12#include <linux/netdevice.h>
13#include <linux/types.h>
14#include <linux/slab.h>
15#include <linux/skbuff.h>
16#include <linux/if_arp.h>
0d174406 17#include <linux/timer.h>
d0709a65 18#include <linux/rtnetlink.h>
f0706e82
JB
19
20#include <net/mac80211.h>
21#include "ieee80211_i.h"
24487981 22#include "driver-ops.h"
2c8dccc7 23#include "rate.h"
f0706e82 24#include "sta_info.h"
e9f207f0 25#include "debugfs_sta.h"
ee385855 26#include "mesh.h"
f0706e82 27
d0709a65
JB
28/**
29 * DOC: STA information lifetime rules
30 *
31 * STA info structures (&struct sta_info) are managed in a hash table
32 * for faster lookup and a list for iteration. They are managed using
33 * RCU, i.e. access to the list and hash table is protected by RCU.
34 *
03e4497e
JB
35 * Upon allocating a STA info structure with sta_info_alloc(), the caller owns
36 * that structure. It must then either destroy it using sta_info_destroy()
37 * (which is pretty useless) or insert it into the hash table using
38 * sta_info_insert() which demotes the reference from ownership to a regular
39 * RCU-protected reference; if the function is called without protection by an
93e5deb1
JB
40 * RCU critical section the reference is instantly invalidated. Note that the
41 * caller may not do much with the STA info before inserting it, in particular,
42 * it may not start any mesh peer link management or add encryption keys.
43 *
44 * When the insertion fails (sta_info_insert()) returns non-zero), the
45 * structure will have been freed by sta_info_insert()!
d0709a65
JB
46 *
47 * Because there are debugfs entries for each station, and adding those
48 * must be able to sleep, it is also possible to "pin" a station entry,
49 * that means it can be removed from the hash table but not be freed.
93e5deb1
JB
50 * See the comment in __sta_info_unlink() for more information, this is
51 * an internal capability only.
d0709a65
JB
52 *
53 * In order to remove a STA info structure, the caller needs to first
dbbea671 54 * unlink it (sta_info_unlink()) from the list and hash tables and
3b96766f
JB
55 * then destroy it; sta_info_destroy() will wait for an RCU grace period
56 * to elapse before actually freeing it. Due to the pinning and the
57 * possibility of multiple callers trying to remove the same STA info at
58 * the same time, sta_info_unlink() can clear the STA info pointer it is
59 * passed to indicate that the STA info is owned by somebody else now.
d0709a65 60 *
dbbea671 61 * If sta_info_unlink() did not clear the pointer then the caller owns
d0709a65 62 * the STA info structure now and is responsible of destroying it with
3b96766f 63 * a call to sta_info_destroy().
d0709a65
JB
64 *
65 * In all other cases, there is no concept of ownership on a STA entry,
66 * each structure is owned by the global hash table/list until it is
67 * removed. All users of the structure need to be RCU protected so that
68 * the structure won't be freed before they are done using it.
69 */
f0706e82
JB
70
71/* Caller must hold local->sta_lock */
be8755e1
MW
72static int sta_info_hash_del(struct ieee80211_local *local,
73 struct sta_info *sta)
f0706e82
JB
74{
75 struct sta_info *s;
76
17741cdc 77 s = local->sta_hash[STA_HASH(sta->sta.addr)];
f0706e82 78 if (!s)
be8755e1
MW
79 return -ENOENT;
80 if (s == sta) {
17741cdc 81 rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)],
d0709a65 82 s->hnext);
be8755e1 83 return 0;
f0706e82
JB
84 }
85
be8755e1 86 while (s->hnext && s->hnext != sta)
f0706e82 87 s = s->hnext;
be8755e1 88 if (s->hnext) {
d0709a65 89 rcu_assign_pointer(s->hnext, sta->hnext);
be8755e1
MW
90 return 0;
91 }
f0706e82 92
be8755e1 93 return -ENOENT;
f0706e82
JB
94}
95
d0709a65 96/* protected by RCU */
4b7679a5 97struct sta_info *sta_info_get(struct ieee80211_local *local, const u8 *addr)
f0706e82
JB
98{
99 struct sta_info *sta;
100
d0709a65 101 sta = rcu_dereference(local->sta_hash[STA_HASH(addr)]);
f0706e82 102 while (sta) {
5cf12e8d 103 if (memcmp(sta->sta.addr, addr, ETH_ALEN) == 0)
f0706e82 104 break;
d0709a65 105 sta = rcu_dereference(sta->hnext);
f0706e82 106 }
43ba7e95
JB
107 return sta;
108}
109
ee385855
LCC
110struct sta_info *sta_info_get_by_idx(struct ieee80211_local *local, int idx,
111 struct net_device *dev)
112{
113 struct sta_info *sta;
114 int i = 0;
115
d0709a65 116 list_for_each_entry_rcu(sta, &local->sta_list, list) {
2a8ca29a
LCC
117 if (dev && dev != sta->sdata->dev)
118 continue;
ee385855
LCC
119 if (i < idx) {
120 ++i;
121 continue;
ee385855 122 }
2a8ca29a 123 return sta;
ee385855 124 }
ee385855
LCC
125
126 return NULL;
127}
f0706e82 128
93e5deb1
JB
129/**
130 * __sta_info_free - internal STA free helper
131 *
6ef307bc 132 * @local: pointer to the global information
93e5deb1
JB
133 * @sta: STA info to free
134 *
135 * This function must undo everything done by sta_info_alloc()
136 * that may happen before sta_info_insert().
137 */
138static void __sta_info_free(struct ieee80211_local *local,
139 struct sta_info *sta)
140{
4b7679a5 141 rate_control_free_sta(sta);
93e5deb1
JB
142 rate_control_put(sta->rate_ctrl);
143
144#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
0c68ae26
JB
145 printk(KERN_DEBUG "%s: Destroyed STA %pM\n",
146 wiphy_name(local->hw.wiphy), sta->sta.addr);
93e5deb1
JB
147#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
148
149 kfree(sta);
150}
151
d0709a65 152void sta_info_destroy(struct sta_info *sta)
f0706e82 153{
97bff8ec 154 struct ieee80211_local *local;
f0706e82 155 struct sk_buff *skb;
07db2183 156 int i;
73651ee6 157
97bff8ec
JB
158 might_sleep();
159
73651ee6
JB
160 if (!sta)
161 return;
f0706e82 162
97bff8ec 163 local = sta->local;
d0709a65
JB
164
165 rate_control_remove_sta_debugfs(sta);
166 ieee80211_sta_debugfs_remove(sta);
167
168#ifdef CONFIG_MAC80211_MESH
169 if (ieee80211_vif_is_mesh(&sta->sdata->vif))
170 mesh_plink_deactivate(sta);
171#endif
172
3b96766f
JB
173 /*
174 * We have only unlinked the key, and actually destroying it
175 * may mean it is removed from hardware which requires that
176 * the key->sta pointer is still valid, so flush the key todo
177 * list here.
178 *
179 * ieee80211_key_todo() will synchronize_rcu() so after this
180 * nothing can reference this sta struct any more.
181 */
182 ieee80211_key_todo();
d0709a65
JB
183
184#ifdef CONFIG_MAC80211_MESH
185 if (ieee80211_vif_is_mesh(&sta->sdata->vif))
186 del_timer_sync(&sta->plink_timer);
187#endif
188
f0706e82
JB
189 while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
190 local->total_ps_buffered--;
191 dev_kfree_skb_any(skb);
192 }
d0709a65
JB
193
194 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL)
f0706e82 195 dev_kfree_skb_any(skb);
d0709a65 196
fe3bf0f5 197 for (i = 0; i < STA_TID_NUM; i++) {
55687e38
JB
198 struct tid_ampdu_rx *tid_rx;
199 struct tid_ampdu_tx *tid_tx;
200
07346f81 201 spin_lock_bh(&sta->lock);
55687e38
JB
202 tid_rx = sta->ampdu_mlme.tid_rx[i];
203 /* Make sure timer won't free the tid_rx struct, see below */
204 if (tid_rx)
205 tid_rx->shutdown = true;
96f5e66e 206
07346f81 207 spin_unlock_bh(&sta->lock);
55687e38
JB
208
209 /*
210 * Outside spinlock - shutdown is true now so that the timer
211 * won't free tid_rx, we have to do that now. Can't let the
212 * timer do it because we have to sync the timer outside the
213 * lock that it takes itself.
214 */
215 if (tid_rx) {
216 del_timer_sync(&tid_rx->session_timer);
217 kfree(tid_rx);
218 }
219
220 /*
221 * No need to do such complications for TX agg sessions, the
222 * path leading to freeing the tid_tx struct goes via a call
223 * from the driver, and thus needs to look up the sta struct
224 * again, which cannot be found when we get here. Hence, we
225 * just need to delete the timer and free the aggregation
226 * info; we won't be telling the peer about it then but that
227 * doesn't matter if we're not talking to it again anyway.
228 */
229 tid_tx = sta->ampdu_mlme.tid_tx[i];
230 if (tid_tx) {
231 del_timer_sync(&tid_tx->addba_resp_timer);
cd8ffc80
JB
232 /*
233 * STA removed while aggregation session being
234 * started? Bit odd, but purge frames anyway.
235 */
236 skb_queue_purge(&tid_tx->pending);
55687e38
JB
237 kfree(tid_tx);
238 }
fe3bf0f5 239 }
cee24a3e 240
93e5deb1 241 __sta_info_free(local, sta);
f0706e82
JB
242}
243
244
d0709a65
JB
245/* Caller must hold local->sta_lock */
246static void sta_info_hash_add(struct ieee80211_local *local,
247 struct sta_info *sta)
f0706e82 248{
17741cdc
JB
249 sta->hnext = local->sta_hash[STA_HASH(sta->sta.addr)];
250 rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)], sta);
f0706e82 251}
f0706e82 252
73651ee6
JB
253struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
254 u8 *addr, gfp_t gfp)
f0706e82 255{
d0709a65 256 struct ieee80211_local *local = sdata->local;
f0706e82 257 struct sta_info *sta;
16c5f15c 258 int i;
f0706e82 259
17741cdc 260 sta = kzalloc(sizeof(*sta) + local->hw.sta_data_size, gfp);
f0706e82 261 if (!sta)
73651ee6 262 return NULL;
f0706e82 263
07346f81 264 spin_lock_init(&sta->lock);
5a9f7b04 265 spin_lock_init(&sta->flaglock);
07346f81 266
17741cdc 267 memcpy(sta->sta.addr, addr, ETH_ALEN);
d0709a65
JB
268 sta->local = local;
269 sta->sdata = sdata;
f0706e82
JB
270
271 sta->rate_ctrl = rate_control_get(local->rate_ctrl);
d0709a65 272 sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl,
4b7679a5 273 &sta->sta, gfp);
f0706e82
JB
274 if (!sta->rate_ctrl_priv) {
275 rate_control_put(sta->rate_ctrl);
f0706e82 276 kfree(sta);
73651ee6 277 return NULL;
f0706e82
JB
278 }
279
16c5f15c
RR
280 for (i = 0; i < STA_TID_NUM; i++) {
281 /* timer_to_tid must be initialized with identity mapping to
282 * enable session_timer's data differentiation. refer to
283 * sta_rx_agg_session_timer_expired for useage */
284 sta->timer_to_tid[i] = i;
cee24a3e
RR
285 /* rx */
286 sta->ampdu_mlme.tid_state_rx[i] = HT_AGG_STATE_IDLE;
287 sta->ampdu_mlme.tid_rx[i] = NULL;
288 /* tx */
289 sta->ampdu_mlme.tid_state_tx[i] = HT_AGG_STATE_IDLE;
290 sta->ampdu_mlme.tid_tx[i] = NULL;
291 sta->ampdu_mlme.addba_req_num[i] = 0;
16c5f15c 292 }
f0706e82
JB
293 skb_queue_head_init(&sta->ps_tx_buf);
294 skb_queue_head_init(&sta->tx_filtered);
73651ee6 295
cccaec98
SB
296 for (i = 0; i < NUM_RX_DATA_QUEUES; i++)
297 sta->last_seq_ctrl[i] = cpu_to_le16(USHORT_MAX);
298
73651ee6 299#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
0c68ae26
JB
300 printk(KERN_DEBUG "%s: Allocated STA %pM\n",
301 wiphy_name(local->hw.wiphy), sta->sta.addr);
73651ee6
JB
302#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
303
03e4497e 304#ifdef CONFIG_MAC80211_MESH
b4e08ea1 305 sta->plink_state = PLINK_LISTEN;
03e4497e
JB
306 init_timer(&sta->plink_timer);
307#endif
308
73651ee6
JB
309 return sta;
310}
311
312int sta_info_insert(struct sta_info *sta)
313{
314 struct ieee80211_local *local = sta->local;
315 struct ieee80211_sub_if_data *sdata = sta->sdata;
316 unsigned long flags;
93e5deb1 317 int err = 0;
73651ee6 318
03e4497e
JB
319 /*
320 * Can't be a WARN_ON because it can be triggered through a race:
321 * something inserts a STA (on one CPU) without holding the RTNL
322 * and another CPU turns off the net device.
323 */
93e5deb1
JB
324 if (unlikely(!netif_running(sdata->dev))) {
325 err = -ENETDOWN;
326 goto out_free;
327 }
03e4497e 328
17741cdc 329 if (WARN_ON(compare_ether_addr(sta->sta.addr, sdata->dev->dev_addr) == 0 ||
c6a1fa12 330 is_multicast_ether_addr(sta->sta.addr))) {
93e5deb1
JB
331 err = -EINVAL;
332 goto out_free;
333 }
44213b5e 334
d0709a65 335 spin_lock_irqsave(&local->sta_lock, flags);
43ba7e95 336 /* check if STA exists already */
4b7679a5 337 if (sta_info_get(local, sta->sta.addr)) {
d0709a65 338 spin_unlock_irqrestore(&local->sta_lock, flags);
93e5deb1
JB
339 err = -EEXIST;
340 goto out_free;
43ba7e95 341 }
f0706e82
JB
342 list_add(&sta->list, &local->sta_list);
343 local->num_sta++;
344 sta_info_hash_add(local, sta);
32bfd35d 345
d0709a65
JB
346 /* notify driver */
347 if (local->ops->sta_notify) {
05c914fe 348 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3e122be0
JB
349 sdata = container_of(sdata->bss,
350 struct ieee80211_sub_if_data,
351 u.ap);
32bfd35d 352
24487981 353 drv_sta_notify(local, &sdata->vif, STA_NOTIFY_ADD, &sta->sta);
32bfd35d 354 }
d0709a65 355
f0706e82 356#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
0c68ae26
JB
357 printk(KERN_DEBUG "%s: Inserted STA %pM\n",
358 wiphy_name(local->hw.wiphy), sta->sta.addr);
f0706e82
JB
359#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
360
73651ee6
JB
361 spin_unlock_irqrestore(&local->sta_lock, flags);
362
e9f207f0 363#ifdef CONFIG_MAC80211_DEBUGFS
93e5deb1
JB
364 /*
365 * Debugfs entry adding might sleep, so schedule process
be8755e1 366 * context task for adding entry for STAs that do not yet
93e5deb1
JB
367 * have one.
368 * NOTE: due to auto-freeing semantics this may only be done
369 * if the insertion is successful!
370 */
49ec6fa2 371 schedule_work(&local->sta_debugfs_add);
e9f207f0
JB
372#endif
373
73651ee6
JB
374 if (ieee80211_vif_is_mesh(&sdata->vif))
375 mesh_accept_plinks_update(sdata);
376
377 return 0;
93e5deb1
JB
378 out_free:
379 BUG_ON(!err);
380 __sta_info_free(local, sta);
381 return err;
f0706e82
JB
382}
383
004c872e
JB
384static inline void __bss_tim_set(struct ieee80211_if_ap *bss, u16 aid)
385{
386 /*
387 * This format has been mandated by the IEEE specifications,
388 * so this line may not be changed to use the __set_bit() format.
389 */
390 bss->tim[aid / 8] |= (1 << (aid % 8));
391}
392
393static inline void __bss_tim_clear(struct ieee80211_if_ap *bss, u16 aid)
394{
395 /*
396 * This format has been mandated by the IEEE specifications,
397 * so this line may not be changed to use the __clear_bit() format.
398 */
399 bss->tim[aid / 8] &= ~(1 << (aid % 8));
400}
401
402static void __sta_info_set_tim_bit(struct ieee80211_if_ap *bss,
403 struct sta_info *sta)
404{
3e122be0
JB
405 BUG_ON(!bss);
406
17741cdc 407 __bss_tim_set(bss, sta->sta.aid);
3e122be0 408
d0709a65
JB
409 if (sta->local->ops->set_tim) {
410 sta->local->tim_in_locked_section = true;
24487981 411 drv_set_tim(sta->local, &sta->sta, true);
d0709a65
JB
412 sta->local->tim_in_locked_section = false;
413 }
004c872e
JB
414}
415
416void sta_info_set_tim_bit(struct sta_info *sta)
417{
d0709a65 418 unsigned long flags;
004c872e 419
3e122be0
JB
420 BUG_ON(!sta->sdata->bss);
421
d0709a65
JB
422 spin_lock_irqsave(&sta->local->sta_lock, flags);
423 __sta_info_set_tim_bit(sta->sdata->bss, sta);
424 spin_unlock_irqrestore(&sta->local->sta_lock, flags);
004c872e
JB
425}
426
427static void __sta_info_clear_tim_bit(struct ieee80211_if_ap *bss,
428 struct sta_info *sta)
429{
3e122be0
JB
430 BUG_ON(!bss);
431
17741cdc 432 __bss_tim_clear(bss, sta->sta.aid);
3e122be0 433
d0709a65
JB
434 if (sta->local->ops->set_tim) {
435 sta->local->tim_in_locked_section = true;
24487981 436 drv_set_tim(sta->local, &sta->sta, false);
d0709a65
JB
437 sta->local->tim_in_locked_section = false;
438 }
004c872e
JB
439}
440
441void sta_info_clear_tim_bit(struct sta_info *sta)
442{
d0709a65 443 unsigned long flags;
004c872e 444
3e122be0
JB
445 BUG_ON(!sta->sdata->bss);
446
d0709a65
JB
447 spin_lock_irqsave(&sta->local->sta_lock, flags);
448 __sta_info_clear_tim_bit(sta->sdata->bss, sta);
449 spin_unlock_irqrestore(&sta->local->sta_lock, flags);
004c872e
JB
450}
451
24723d1b 452static void __sta_info_unlink(struct sta_info **sta)
f0706e82 453{
d0709a65
JB
454 struct ieee80211_local *local = (*sta)->local;
455 struct ieee80211_sub_if_data *sdata = (*sta)->sdata;
d0709a65
JB
456 /*
457 * pull caller's reference if we're already gone.
458 */
459 if (sta_info_hash_del(local, *sta)) {
460 *sta = NULL;
461 return;
462 }
be8755e1 463
3b96766f
JB
464 if ((*sta)->key) {
465 ieee80211_key_free((*sta)->key);
466 WARN_ON((*sta)->key);
467 }
468
7d1559f1
JB
469 list_del(&(*sta)->list);
470
07346f81 471 if (test_and_clear_sta_flags(*sta, WLAN_STA_PS)) {
3e122be0
JB
472 BUG_ON(!sdata->bss);
473
474 atomic_dec(&sdata->bss->num_sta_ps);
7d1559f1
JB
475 __sta_info_clear_tim_bit(sdata->bss, *sta);
476 }
477
478 local->num_sta--;
479
480 if (local->ops->sta_notify) {
05c914fe 481 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
3e122be0
JB
482 sdata = container_of(sdata->bss,
483 struct ieee80211_sub_if_data,
484 u.ap);
7d1559f1 485
24487981
JB
486 drv_sta_notify(local, &sdata->vif, STA_NOTIFY_REMOVE,
487 &(*sta)->sta);
7d1559f1
JB
488 }
489
490 if (ieee80211_vif_is_mesh(&sdata->vif)) {
491 mesh_accept_plinks_update(sdata);
492#ifdef CONFIG_MAC80211_MESH
493 del_timer(&(*sta)->plink_timer);
494#endif
495 }
496
497#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
0c68ae26
JB
498 printk(KERN_DEBUG "%s: Removed STA %pM\n",
499 wiphy_name(local->hw.wiphy), (*sta)->sta.addr);
7d1559f1
JB
500#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
501
d0709a65 502 /*
7d1559f1 503 * Finally, pull caller's reference if the STA is pinned by the
d0709a65
JB
504 * task that is adding the debugfs entries. In that case, we
505 * leave the STA "to be freed".
506 *
507 * The rules are not trivial, but not too complex either:
508 * (1) pin_status is only modified under the sta_lock
49ec6fa2
JB
509 * (2) STAs may only be pinned under the RTNL so that
510 * sta_info_flush() is guaranteed to actually destroy
511 * all STAs that are active for a given interface, this
512 * is required for correctness because otherwise we
513 * could notify a driver that an interface is going
514 * away and only after that (!) notify it about a STA
515 * on that interface going away.
516 * (3) sta_info_debugfs_add_work() will set the status
d0709a65
JB
517 * to PINNED when it found an item that needs a new
518 * debugfs directory created. In that case, that item
519 * must not be freed although all *RCU* users are done
520 * with it. Hence, we tell the caller of _unlink()
521 * that the item is already gone (as can happen when
522 * two tasks try to unlink/destroy at the same time)
49ec6fa2 523 * (4) We set the pin_status to DESTROY here when we
d0709a65 524 * find such an item.
49ec6fa2 525 * (5) sta_info_debugfs_add_work() will reset the pin_status
d0709a65
JB
526 * from PINNED to NORMAL when it is done with the item,
527 * but will check for DESTROY before resetting it in
528 * which case it will free the item.
529 */
530 if ((*sta)->pin_status == STA_INFO_PIN_STAT_PINNED) {
531 (*sta)->pin_status = STA_INFO_PIN_STAT_DESTROY;
532 *sta = NULL;
533 return;
534 }
f0706e82
JB
535}
536
d0709a65
JB
537void sta_info_unlink(struct sta_info **sta)
538{
539 struct ieee80211_local *local = (*sta)->local;
540 unsigned long flags;
541
542 spin_lock_irqsave(&local->sta_lock, flags);
543 __sta_info_unlink(sta);
544 spin_unlock_irqrestore(&local->sta_lock, flags);
545}
f0706e82 546
57c4d7b4
JB
547static int sta_info_buffer_expired(struct sta_info *sta,
548 struct sk_buff *skb)
f0706e82 549{
e039fa4a 550 struct ieee80211_tx_info *info;
f0706e82
JB
551 int timeout;
552
553 if (!skb)
554 return 0;
555
e039fa4a 556 info = IEEE80211_SKB_CB(skb);
f0706e82
JB
557
558 /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
57c4d7b4
JB
559 timeout = (sta->listen_interval *
560 sta->sdata->vif.bss_conf.beacon_int *
561 32 / 15625) * HZ;
f0706e82
JB
562 if (timeout < STA_TX_BUFFER_EXPIRE)
563 timeout = STA_TX_BUFFER_EXPIRE;
e039fa4a 564 return time_after(jiffies, info->control.jiffies + timeout);
f0706e82
JB
565}
566
567
568static void sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
569 struct sta_info *sta)
570{
571 unsigned long flags;
572 struct sk_buff *skb;
836341a7 573 struct ieee80211_sub_if_data *sdata;
f0706e82
JB
574
575 if (skb_queue_empty(&sta->ps_tx_buf))
576 return;
577
578 for (;;) {
579 spin_lock_irqsave(&sta->ps_tx_buf.lock, flags);
580 skb = skb_peek(&sta->ps_tx_buf);
57c4d7b4 581 if (sta_info_buffer_expired(sta, skb))
f0706e82 582 skb = __skb_dequeue(&sta->ps_tx_buf);
836341a7 583 else
f0706e82
JB
584 skb = NULL;
585 spin_unlock_irqrestore(&sta->ps_tx_buf.lock, flags);
586
836341a7 587 if (!skb)
f0706e82 588 break;
836341a7 589
d0709a65 590 sdata = sta->sdata;
836341a7 591 local->total_ps_buffered--;
f4ea83dd 592#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
0c68ae26
JB
593 printk(KERN_DEBUG "Buffered frame expired (STA %pM)\n",
594 sta->sta.addr);
f4ea83dd 595#endif
836341a7
JB
596 dev_kfree_skb(skb);
597
004c872e
JB
598 if (skb_queue_empty(&sta->ps_tx_buf))
599 sta_info_clear_tim_bit(sta);
f0706e82
JB
600 }
601}
602
603
604static void sta_info_cleanup(unsigned long data)
605{
606 struct ieee80211_local *local = (struct ieee80211_local *) data;
607 struct sta_info *sta;
608
d0709a65
JB
609 rcu_read_lock();
610 list_for_each_entry_rcu(sta, &local->sta_list, list)
f0706e82 611 sta_info_cleanup_expire_buffered(local, sta);
d0709a65 612 rcu_read_unlock();
f0706e82 613
5bb644a0
JB
614 if (local->quiescing)
615 return;
616
0d174406
JB
617 local->sta_cleanup.expires =
618 round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL);
f0706e82
JB
619 add_timer(&local->sta_cleanup);
620}
621
e9f207f0 622#ifdef CONFIG_MAC80211_DEBUGFS
4d6141c3
JS
623/*
624 * See comment in __sta_info_unlink,
625 * caller must hold local->sta_lock.
626 */
627static void __sta_info_pin(struct sta_info *sta)
628{
629 WARN_ON(sta->pin_status != STA_INFO_PIN_STAT_NORMAL);
630 sta->pin_status = STA_INFO_PIN_STAT_PINNED;
631}
632
633/*
634 * See comment in __sta_info_unlink, returns sta if it
635 * needs to be destroyed.
636 */
637static struct sta_info *__sta_info_unpin(struct sta_info *sta)
638{
639 struct sta_info *ret = NULL;
640 unsigned long flags;
641
642 spin_lock_irqsave(&sta->local->sta_lock, flags);
643 WARN_ON(sta->pin_status != STA_INFO_PIN_STAT_DESTROY &&
644 sta->pin_status != STA_INFO_PIN_STAT_PINNED);
645 if (sta->pin_status == STA_INFO_PIN_STAT_DESTROY)
646 ret = sta;
647 sta->pin_status = STA_INFO_PIN_STAT_NORMAL;
648 spin_unlock_irqrestore(&sta->local->sta_lock, flags);
649
650 return ret;
651}
652
d0709a65 653static void sta_info_debugfs_add_work(struct work_struct *work)
e9f207f0
JB
654{
655 struct ieee80211_local *local =
656 container_of(work, struct ieee80211_local, sta_debugfs_add);
657 struct sta_info *sta, *tmp;
d0709a65 658 unsigned long flags;
e9f207f0 659
49ec6fa2
JB
660 /* We need to keep the RTNL across the whole pinned status. */
661 rtnl_lock();
e9f207f0
JB
662 while (1) {
663 sta = NULL;
d0709a65
JB
664
665 spin_lock_irqsave(&local->sta_lock, flags);
e9f207f0 666 list_for_each_entry(tmp, &local->sta_list, list) {
63044e9f
JB
667 /*
668 * debugfs.add_has_run will be set by
669 * ieee80211_sta_debugfs_add regardless
670 * of what else it does.
671 */
672 if (!tmp->debugfs.add_has_run) {
e9f207f0 673 sta = tmp;
d0709a65 674 __sta_info_pin(sta);
e9f207f0
JB
675 break;
676 }
677 }
d0709a65 678 spin_unlock_irqrestore(&local->sta_lock, flags);
e9f207f0
JB
679
680 if (!sta)
681 break;
682
e9f207f0
JB
683 ieee80211_sta_debugfs_add(sta);
684 rate_control_add_sta_debugfs(sta);
d0709a65
JB
685
686 sta = __sta_info_unpin(sta);
4f6fab47 687 sta_info_destroy(sta);
e9f207f0 688 }
49ec6fa2 689 rtnl_unlock();
e9f207f0
JB
690}
691#endif
692
f0706e82
JB
693void sta_info_init(struct ieee80211_local *local)
694{
d0709a65 695 spin_lock_init(&local->sta_lock);
f0706e82 696 INIT_LIST_HEAD(&local->sta_list);
f0706e82 697
b24b8a24
PE
698 setup_timer(&local->sta_cleanup, sta_info_cleanup,
699 (unsigned long)local);
0d174406
JB
700 local->sta_cleanup.expires =
701 round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL);
e9f207f0
JB
702
703#ifdef CONFIG_MAC80211_DEBUGFS
d0709a65 704 INIT_WORK(&local->sta_debugfs_add, sta_info_debugfs_add_work);
e9f207f0 705#endif
f0706e82
JB
706}
707
708int sta_info_start(struct ieee80211_local *local)
709{
710 add_timer(&local->sta_cleanup);
711 return 0;
712}
713
714void sta_info_stop(struct ieee80211_local *local)
715{
f0706e82 716 del_timer(&local->sta_cleanup);
49ec6fa2
JB
717#ifdef CONFIG_MAC80211_DEBUGFS
718 /*
719 * Make sure the debugfs adding work isn't pending after this
720 * because we're about to be destroyed. It doesn't matter
721 * whether it ran or not since we're going to flush all STAs
722 * anyway.
723 */
724 cancel_work_sync(&local->sta_debugfs_add);
725#endif
dc6676b7 726
be8755e1 727 sta_info_flush(local, NULL);
f0706e82
JB
728}
729
f0706e82
JB
730/**
731 * sta_info_flush - flush matching STA entries from the STA table
44213b5e
JB
732 *
733 * Returns the number of removed STA entries.
734 *
f0706e82 735 * @local: local interface data
d0709a65 736 * @sdata: matching rule for the net device (sta->dev) or %NULL to match all STAs
f0706e82 737 */
44213b5e 738int sta_info_flush(struct ieee80211_local *local,
af8cdcd8 739 struct ieee80211_sub_if_data *sdata)
f0706e82
JB
740{
741 struct sta_info *sta, *tmp;
be8755e1 742 LIST_HEAD(tmp_list);
44213b5e 743 int ret = 0;
d0709a65 744 unsigned long flags;
f0706e82 745
d0709a65 746 might_sleep();
be8755e1 747
d0709a65
JB
748 spin_lock_irqsave(&local->sta_lock, flags);
749 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
750 if (!sdata || sdata == sta->sdata) {
751 __sta_info_unlink(&sta);
44213b5e 752 if (sta) {
d0709a65 753 list_add_tail(&sta->list, &tmp_list);
44213b5e
JB
754 ret++;
755 }
d0709a65 756 }
be8755e1 757 }
d0709a65
JB
758 spin_unlock_irqrestore(&local->sta_lock, flags);
759
d0709a65
JB
760 list_for_each_entry_safe(sta, tmp, &tmp_list, list)
761 sta_info_destroy(sta);
44213b5e
JB
762
763 return ret;
f0706e82 764}
dc6676b7 765
24723d1b
JB
766void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
767 unsigned long exp_time)
768{
769 struct ieee80211_local *local = sdata->local;
770 struct sta_info *sta, *tmp;
771 LIST_HEAD(tmp_list);
24723d1b
JB
772 unsigned long flags;
773
774 spin_lock_irqsave(&local->sta_lock, flags);
775 list_for_each_entry_safe(sta, tmp, &local->sta_list, list)
776 if (time_after(jiffies, sta->last_rx + exp_time)) {
777#ifdef CONFIG_MAC80211_IBSS_DEBUG
0c68ae26
JB
778 printk(KERN_DEBUG "%s: expiring inactive STA %pM\n",
779 sdata->dev->name, sta->sta.addr);
24723d1b
JB
780#endif
781 __sta_info_unlink(&sta);
782 if (sta)
783 list_add(&sta->list, &tmp_list);
784 }
785 spin_unlock_irqrestore(&local->sta_lock, flags);
786
787 list_for_each_entry_safe(sta, tmp, &tmp_list, list)
788 sta_info_destroy(sta);
789}
17741cdc
JB
790
791struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_hw *hw,
c6a1fa12 792 const u8 *addr)
17741cdc 793{
4b7679a5 794 struct sta_info *sta = sta_info_get(hw_to_local(hw), addr);
17741cdc
JB
795
796 if (!sta)
797 return NULL;
798 return &sta->sta;
799}
800EXPORT_SYMBOL(ieee80211_find_sta);