blob: 10c5539c20abdcafdd8fc1461914b2b9b43ba3ff [file] [log] [blame]
Jiri Bencf0706e822007-05-05 11:45:53 -07001/*
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>
Johannes Berg0d174402007-12-17 15:07:43 +010017#include <linux/timer.h>
Johannes Bergd0709a62008-02-25 16:27:46 +010018#include <linux/rtnetlink.h>
Jiri Bencf0706e822007-05-05 11:45:53 -070019
20#include <net/mac80211.h>
21#include "ieee80211_i.h"
Johannes Berg2c8dccc2008-04-08 15:14:40 -040022#include "rate.h"
Jiri Bencf0706e822007-05-05 11:45:53 -070023#include "sta_info.h"
Jiri Bence9f207f2007-05-05 11:46:38 -070024#include "debugfs_sta.h"
Luis Carlos Coboee385852008-02-23 15:17:11 +010025#include "mesh.h"
Jiri Bencf0706e822007-05-05 11:45:53 -070026
Johannes Bergd0709a62008-02-25 16:27:46 +010027/**
28 * DOC: STA information lifetime rules
29 *
30 * STA info structures (&struct sta_info) are managed in a hash table
31 * for faster lookup and a list for iteration. They are managed using
32 * RCU, i.e. access to the list and hash table is protected by RCU.
33 *
Johannes Berg03e44972008-02-27 09:56:40 +010034 * Upon allocating a STA info structure with sta_info_alloc(), the caller owns
35 * that structure. It must then either destroy it using sta_info_destroy()
36 * (which is pretty useless) or insert it into the hash table using
37 * sta_info_insert() which demotes the reference from ownership to a regular
38 * RCU-protected reference; if the function is called without protection by an
Johannes Berg93e5deb2008-04-01 15:21:00 +020039 * RCU critical section the reference is instantly invalidated. Note that the
40 * caller may not do much with the STA info before inserting it, in particular,
41 * it may not start any mesh peer link management or add encryption keys.
42 *
43 * When the insertion fails (sta_info_insert()) returns non-zero), the
44 * structure will have been freed by sta_info_insert()!
Johannes Bergd0709a62008-02-25 16:27:46 +010045 *
46 * Because there are debugfs entries for each station, and adding those
47 * must be able to sleep, it is also possible to "pin" a station entry,
48 * that means it can be removed from the hash table but not be freed.
Johannes Berg93e5deb2008-04-01 15:21:00 +020049 * See the comment in __sta_info_unlink() for more information, this is
50 * an internal capability only.
Johannes Bergd0709a62008-02-25 16:27:46 +010051 *
52 * In order to remove a STA info structure, the caller needs to first
Johannes Bergdbbea672008-02-26 14:34:06 +010053 * unlink it (sta_info_unlink()) from the list and hash tables and
Johannes Berg3b967662008-04-08 17:56:52 +020054 * then destroy it; sta_info_destroy() will wait for an RCU grace period
55 * to elapse before actually freeing it. Due to the pinning and the
56 * possibility of multiple callers trying to remove the same STA info at
57 * the same time, sta_info_unlink() can clear the STA info pointer it is
58 * passed to indicate that the STA info is owned by somebody else now.
Johannes Bergd0709a62008-02-25 16:27:46 +010059 *
Johannes Bergdbbea672008-02-26 14:34:06 +010060 * If sta_info_unlink() did not clear the pointer then the caller owns
Johannes Bergd0709a62008-02-25 16:27:46 +010061 * the STA info structure now and is responsible of destroying it with
Johannes Berg3b967662008-04-08 17:56:52 +020062 * a call to sta_info_destroy().
Johannes Bergd0709a62008-02-25 16:27:46 +010063 *
64 * In all other cases, there is no concept of ownership on a STA entry,
65 * each structure is owned by the global hash table/list until it is
66 * removed. All users of the structure need to be RCU protected so that
67 * the structure won't be freed before they are done using it.
68 */
Jiri Bencf0706e822007-05-05 11:45:53 -070069
70/* Caller must hold local->sta_lock */
Michael Wube8755e2007-07-27 15:43:23 +020071static int sta_info_hash_del(struct ieee80211_local *local,
72 struct sta_info *sta)
Jiri Bencf0706e822007-05-05 11:45:53 -070073{
74 struct sta_info *s;
75
Johannes Berg17741cd2008-09-11 00:02:02 +020076 s = local->sta_hash[STA_HASH(sta->sta.addr)];
Jiri Bencf0706e822007-05-05 11:45:53 -070077 if (!s)
Michael Wube8755e2007-07-27 15:43:23 +020078 return -ENOENT;
79 if (s == sta) {
Johannes Berg17741cd2008-09-11 00:02:02 +020080 rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)],
Johannes Bergd0709a62008-02-25 16:27:46 +010081 s->hnext);
Michael Wube8755e2007-07-27 15:43:23 +020082 return 0;
Jiri Bencf0706e822007-05-05 11:45:53 -070083 }
84
Michael Wube8755e2007-07-27 15:43:23 +020085 while (s->hnext && s->hnext != sta)
Jiri Bencf0706e822007-05-05 11:45:53 -070086 s = s->hnext;
Michael Wube8755e2007-07-27 15:43:23 +020087 if (s->hnext) {
Johannes Bergd0709a62008-02-25 16:27:46 +010088 rcu_assign_pointer(s->hnext, sta->hnext);
Michael Wube8755e2007-07-27 15:43:23 +020089 return 0;
90 }
Jiri Bencf0706e822007-05-05 11:45:53 -070091
Michael Wube8755e2007-07-27 15:43:23 +020092 return -ENOENT;
Jiri Bencf0706e822007-05-05 11:45:53 -070093}
94
Johannes Bergd0709a62008-02-25 16:27:46 +010095/* protected by RCU */
Johannes Berg4b7679a2008-09-18 18:14:18 +020096struct sta_info *sta_info_get(struct ieee80211_local *local, const u8 *addr)
Johannes Berg43ba7e92008-02-21 14:09:30 +010097{
98 struct sta_info *sta;
99
Johannes Bergd0709a62008-02-25 16:27:46 +0100100 sta = rcu_dereference(local->sta_hash[STA_HASH(addr)]);
Johannes Berg43ba7e92008-02-21 14:09:30 +0100101 while (sta) {
Shaddy Baddah5cf12e82008-11-28 17:08:10 +1100102 if (memcmp(sta->sta.addr, addr, ETH_ALEN) == 0)
Johannes Berg43ba7e92008-02-21 14:09:30 +0100103 break;
Johannes Bergd0709a62008-02-25 16:27:46 +0100104 sta = rcu_dereference(sta->hnext);
Johannes Berg43ba7e92008-02-21 14:09:30 +0100105 }
106 return sta;
107}
108
Luis Carlos Coboee385852008-02-23 15:17:11 +0100109struct sta_info *sta_info_get_by_idx(struct ieee80211_local *local, int idx,
110 struct net_device *dev)
111{
112 struct sta_info *sta;
113 int i = 0;
114
Johannes Bergd0709a62008-02-25 16:27:46 +0100115 list_for_each_entry_rcu(sta, &local->sta_list, list) {
Luis Carlos Cobo2a8ca292008-02-29 17:51:25 -0800116 if (dev && dev != sta->sdata->dev)
117 continue;
Luis Carlos Coboee385852008-02-23 15:17:11 +0100118 if (i < idx) {
119 ++i;
120 continue;
Luis Carlos Coboee385852008-02-23 15:17:11 +0100121 }
Luis Carlos Cobo2a8ca292008-02-29 17:51:25 -0800122 return sta;
Luis Carlos Coboee385852008-02-23 15:17:11 +0100123 }
Luis Carlos Coboee385852008-02-23 15:17:11 +0100124
125 return NULL;
126}
Jiri Bencf0706e822007-05-05 11:45:53 -0700127
Johannes Berg93e5deb2008-04-01 15:21:00 +0200128/**
129 * __sta_info_free - internal STA free helper
130 *
Randy Dunlap6ef307b2008-07-03 13:52:18 -0700131 * @local: pointer to the global information
Johannes Berg93e5deb2008-04-01 15:21:00 +0200132 * @sta: STA info to free
133 *
134 * This function must undo everything done by sta_info_alloc()
135 * that may happen before sta_info_insert().
136 */
137static void __sta_info_free(struct ieee80211_local *local,
138 struct sta_info *sta)
139{
Johannes Berg4b7679a2008-09-18 18:14:18 +0200140 rate_control_free_sta(sta);
Johannes Berg93e5deb2008-04-01 15:21:00 +0200141 rate_control_put(sta->rate_ctrl);
142
143#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
Johannes Berg0c68ae262008-10-27 15:56:10 -0700144 printk(KERN_DEBUG "%s: Destroyed STA %pM\n",
145 wiphy_name(local->hw.wiphy), sta->sta.addr);
Johannes Berg93e5deb2008-04-01 15:21:00 +0200146#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
147
148 kfree(sta);
149}
150
Johannes Bergd0709a62008-02-25 16:27:46 +0100151void sta_info_destroy(struct sta_info *sta)
Jiri Bencf0706e822007-05-05 11:45:53 -0700152{
Johannes Berg97bff8e2008-03-31 19:23:00 +0200153 struct ieee80211_local *local;
Jiri Bencf0706e822007-05-05 11:45:53 -0700154 struct sk_buff *skb;
Ron Rindjunsky07db2182007-12-25 17:00:33 +0200155 int i;
Johannes Berg73651ee2008-02-25 16:27:47 +0100156
Johannes Berg97bff8e2008-03-31 19:23:00 +0200157 might_sleep();
158
Johannes Berg73651ee2008-02-25 16:27:47 +0100159 if (!sta)
160 return;
Jiri Bencf0706e822007-05-05 11:45:53 -0700161
Johannes Berg97bff8e2008-03-31 19:23:00 +0200162 local = sta->local;
Johannes Bergd0709a62008-02-25 16:27:46 +0100163
164 rate_control_remove_sta_debugfs(sta);
165 ieee80211_sta_debugfs_remove(sta);
166
167#ifdef CONFIG_MAC80211_MESH
168 if (ieee80211_vif_is_mesh(&sta->sdata->vif))
169 mesh_plink_deactivate(sta);
170#endif
171
Johannes Berg3b967662008-04-08 17:56:52 +0200172 /*
173 * We have only unlinked the key, and actually destroying it
174 * may mean it is removed from hardware which requires that
175 * the key->sta pointer is still valid, so flush the key todo
176 * list here.
177 *
178 * ieee80211_key_todo() will synchronize_rcu() so after this
179 * nothing can reference this sta struct any more.
180 */
181 ieee80211_key_todo();
Johannes Bergd0709a62008-02-25 16:27:46 +0100182
183#ifdef CONFIG_MAC80211_MESH
184 if (ieee80211_vif_is_mesh(&sta->sdata->vif))
185 del_timer_sync(&sta->plink_timer);
186#endif
187
Jiri Bencf0706e822007-05-05 11:45:53 -0700188 while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
189 local->total_ps_buffered--;
190 dev_kfree_skb_any(skb);
191 }
Johannes Bergd0709a62008-02-25 16:27:46 +0100192
193 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL)
Jiri Bencf0706e822007-05-05 11:45:53 -0700194 dev_kfree_skb_any(skb);
Johannes Bergd0709a62008-02-25 16:27:46 +0100195
Ron Rindjunskyfe3bf0f2008-01-28 14:07:19 +0200196 for (i = 0; i < STA_TID_NUM; i++) {
Johannes Berg07346f812008-05-03 01:02:02 +0200197 spin_lock_bh(&sta->lock);
Ron Rindjunskycee24a32008-03-26 20:36:03 +0200198 if (sta->ampdu_mlme.tid_rx[i])
199 del_timer_sync(&sta->ampdu_mlme.tid_rx[i]->session_timer);
Ron Rindjunskycee24a32008-03-26 20:36:03 +0200200 if (sta->ampdu_mlme.tid_tx[i])
201 del_timer_sync(&sta->ampdu_mlme.tid_tx[i]->addba_resp_timer);
Johannes Berg07346f812008-05-03 01:02:02 +0200202 spin_unlock_bh(&sta->lock);
Ron Rindjunskyfe3bf0f2008-01-28 14:07:19 +0200203 }
Ron Rindjunskycee24a32008-03-26 20:36:03 +0200204
Johannes Berg93e5deb2008-04-01 15:21:00 +0200205 __sta_info_free(local, sta);
Jiri Bencf0706e822007-05-05 11:45:53 -0700206}
207
208
Johannes Bergd0709a62008-02-25 16:27:46 +0100209/* Caller must hold local->sta_lock */
210static void sta_info_hash_add(struct ieee80211_local *local,
211 struct sta_info *sta)
Jiri Bencf0706e822007-05-05 11:45:53 -0700212{
Johannes Berg17741cd2008-09-11 00:02:02 +0200213 sta->hnext = local->sta_hash[STA_HASH(sta->sta.addr)];
214 rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)], sta);
Jiri Bencf0706e822007-05-05 11:45:53 -0700215}
Jiri Bencf0706e822007-05-05 11:45:53 -0700216
Johannes Berg73651ee2008-02-25 16:27:47 +0100217struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
218 u8 *addr, gfp_t gfp)
Jiri Bencf0706e822007-05-05 11:45:53 -0700219{
Johannes Bergd0709a62008-02-25 16:27:46 +0100220 struct ieee80211_local *local = sdata->local;
Jiri Bencf0706e822007-05-05 11:45:53 -0700221 struct sta_info *sta;
Ron Rindjunsky16c5f152007-12-25 17:00:34 +0200222 int i;
Jiri Bencf0706e822007-05-05 11:45:53 -0700223
Johannes Berg17741cd2008-09-11 00:02:02 +0200224 sta = kzalloc(sizeof(*sta) + local->hw.sta_data_size, gfp);
Jiri Bencf0706e822007-05-05 11:45:53 -0700225 if (!sta)
Johannes Berg73651ee2008-02-25 16:27:47 +0100226 return NULL;
Jiri Bencf0706e822007-05-05 11:45:53 -0700227
Johannes Berg07346f812008-05-03 01:02:02 +0200228 spin_lock_init(&sta->lock);
Johannes Berg5a9f7b02008-06-18 14:58:09 +0200229 spin_lock_init(&sta->flaglock);
Johannes Berg07346f812008-05-03 01:02:02 +0200230
Johannes Berg17741cd2008-09-11 00:02:02 +0200231 memcpy(sta->sta.addr, addr, ETH_ALEN);
Johannes Bergd0709a62008-02-25 16:27:46 +0100232 sta->local = local;
233 sta->sdata = sdata;
Jiri Bencf0706e822007-05-05 11:45:53 -0700234
235 sta->rate_ctrl = rate_control_get(local->rate_ctrl);
Johannes Bergd0709a62008-02-25 16:27:46 +0100236 sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl,
Johannes Berg4b7679a2008-09-18 18:14:18 +0200237 &sta->sta, gfp);
Jiri Bencf0706e822007-05-05 11:45:53 -0700238 if (!sta->rate_ctrl_priv) {
239 rate_control_put(sta->rate_ctrl);
Jiri Bencf0706e822007-05-05 11:45:53 -0700240 kfree(sta);
Johannes Berg73651ee2008-02-25 16:27:47 +0100241 return NULL;
Jiri Bencf0706e822007-05-05 11:45:53 -0700242 }
243
Ron Rindjunsky16c5f152007-12-25 17:00:34 +0200244 for (i = 0; i < STA_TID_NUM; i++) {
245 /* timer_to_tid must be initialized with identity mapping to
246 * enable session_timer's data differentiation. refer to
247 * sta_rx_agg_session_timer_expired for useage */
248 sta->timer_to_tid[i] = i;
Ron Rindjunskyfe3bf0f2008-01-28 14:07:19 +0200249 /* tid to tx queue: initialize according to HW (0 is valid) */
Johannes Berge2530082008-05-17 00:57:14 +0200250 sta->tid_to_tx_q[i] = ieee80211_num_queues(&local->hw);
Ron Rindjunskycee24a32008-03-26 20:36:03 +0200251 /* rx */
252 sta->ampdu_mlme.tid_state_rx[i] = HT_AGG_STATE_IDLE;
253 sta->ampdu_mlme.tid_rx[i] = NULL;
254 /* tx */
255 sta->ampdu_mlme.tid_state_tx[i] = HT_AGG_STATE_IDLE;
256 sta->ampdu_mlme.tid_tx[i] = NULL;
257 sta->ampdu_mlme.addba_req_num[i] = 0;
Ron Rindjunsky16c5f152007-12-25 17:00:34 +0200258 }
Jiri Bencf0706e822007-05-05 11:45:53 -0700259 skb_queue_head_init(&sta->ps_tx_buf);
260 skb_queue_head_init(&sta->tx_filtered);
Johannes Berg73651ee2008-02-25 16:27:47 +0100261
262#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
Johannes Berg0c68ae262008-10-27 15:56:10 -0700263 printk(KERN_DEBUG "%s: Allocated STA %pM\n",
264 wiphy_name(local->hw.wiphy), sta->sta.addr);
Johannes Berg73651ee2008-02-25 16:27:47 +0100265#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
266
Johannes Berg03e44972008-02-27 09:56:40 +0100267#ifdef CONFIG_MAC80211_MESH
Luis Carlos Cobob4e08ea2008-02-29 15:46:08 -0800268 sta->plink_state = PLINK_LISTEN;
Johannes Berg03e44972008-02-27 09:56:40 +0100269 init_timer(&sta->plink_timer);
270#endif
271
Johannes Berg73651ee2008-02-25 16:27:47 +0100272 return sta;
273}
274
275int sta_info_insert(struct sta_info *sta)
276{
277 struct ieee80211_local *local = sta->local;
278 struct ieee80211_sub_if_data *sdata = sta->sdata;
279 unsigned long flags;
Johannes Berg93e5deb2008-04-01 15:21:00 +0200280 int err = 0;
Johannes Berg73651ee2008-02-25 16:27:47 +0100281
Johannes Berg03e44972008-02-27 09:56:40 +0100282 /*
283 * Can't be a WARN_ON because it can be triggered through a race:
284 * something inserts a STA (on one CPU) without holding the RTNL
285 * and another CPU turns off the net device.
286 */
Johannes Berg93e5deb2008-04-01 15:21:00 +0200287 if (unlikely(!netif_running(sdata->dev))) {
288 err = -ENETDOWN;
289 goto out_free;
290 }
Johannes Berg03e44972008-02-27 09:56:40 +0100291
Johannes Berg17741cd2008-09-11 00:02:02 +0200292 if (WARN_ON(compare_ether_addr(sta->sta.addr, sdata->dev->dev_addr) == 0 ||
Johannes Bergc6a1fa12008-10-07 12:04:32 +0200293 is_multicast_ether_addr(sta->sta.addr))) {
Johannes Berg93e5deb2008-04-01 15:21:00 +0200294 err = -EINVAL;
295 goto out_free;
296 }
Johannes Berg44213b52008-02-25 16:27:49 +0100297
Johannes Bergd0709a62008-02-25 16:27:46 +0100298 spin_lock_irqsave(&local->sta_lock, flags);
Johannes Berg43ba7e92008-02-21 14:09:30 +0100299 /* check if STA exists already */
Johannes Berg4b7679a2008-09-18 18:14:18 +0200300 if (sta_info_get(local, sta->sta.addr)) {
Johannes Bergd0709a62008-02-25 16:27:46 +0100301 spin_unlock_irqrestore(&local->sta_lock, flags);
Johannes Berg93e5deb2008-04-01 15:21:00 +0200302 err = -EEXIST;
303 goto out_free;
Johannes Berg43ba7e92008-02-21 14:09:30 +0100304 }
Jiri Bencf0706e822007-05-05 11:45:53 -0700305 list_add(&sta->list, &local->sta_list);
306 local->num_sta++;
307 sta_info_hash_add(local, sta);
Johannes Berg32bfd352007-12-19 01:31:26 +0100308
Johannes Bergd0709a62008-02-25 16:27:46 +0100309 /* notify driver */
310 if (local->ops->sta_notify) {
Johannes Berg05c914f2008-09-11 00:01:58 +0200311 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
Johannes Berg3e122be2008-07-09 14:40:34 +0200312 sdata = container_of(sdata->bss,
313 struct ieee80211_sub_if_data,
314 u.ap);
Johannes Berg32bfd352007-12-19 01:31:26 +0100315
316 local->ops->sta_notify(local_to_hw(local), &sdata->vif,
Johannes Berg17741cd2008-09-11 00:02:02 +0200317 STA_NOTIFY_ADD, &sta->sta);
Johannes Berg32bfd352007-12-19 01:31:26 +0100318 }
Johannes Bergd0709a62008-02-25 16:27:46 +0100319
Jiri Bencf0706e822007-05-05 11:45:53 -0700320#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
Johannes Berg0c68ae262008-10-27 15:56:10 -0700321 printk(KERN_DEBUG "%s: Inserted STA %pM\n",
322 wiphy_name(local->hw.wiphy), sta->sta.addr);
Jiri Bencf0706e822007-05-05 11:45:53 -0700323#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
324
Johannes Berg73651ee2008-02-25 16:27:47 +0100325 spin_unlock_irqrestore(&local->sta_lock, flags);
326
Jiri Bence9f207f2007-05-05 11:46:38 -0700327#ifdef CONFIG_MAC80211_DEBUGFS
Johannes Berg93e5deb2008-04-01 15:21:00 +0200328 /*
329 * Debugfs entry adding might sleep, so schedule process
Michael Wube8755e2007-07-27 15:43:23 +0200330 * context task for adding entry for STAs that do not yet
Johannes Berg93e5deb2008-04-01 15:21:00 +0200331 * have one.
332 * NOTE: due to auto-freeing semantics this may only be done
333 * if the insertion is successful!
334 */
Johannes Berg49ec6fa22008-04-03 14:31:05 +0200335 schedule_work(&local->sta_debugfs_add);
Jiri Bence9f207f2007-05-05 11:46:38 -0700336#endif
337
Johannes Berg73651ee2008-02-25 16:27:47 +0100338 if (ieee80211_vif_is_mesh(&sdata->vif))
339 mesh_accept_plinks_update(sdata);
340
341 return 0;
Johannes Berg93e5deb2008-04-01 15:21:00 +0200342 out_free:
343 BUG_ON(!err);
344 __sta_info_free(local, sta);
345 return err;
Jiri Bencf0706e822007-05-05 11:45:53 -0700346}
347
Johannes Berg004c8722008-02-20 11:21:35 +0100348static inline void __bss_tim_set(struct ieee80211_if_ap *bss, u16 aid)
349{
350 /*
351 * This format has been mandated by the IEEE specifications,
352 * so this line may not be changed to use the __set_bit() format.
353 */
354 bss->tim[aid / 8] |= (1 << (aid % 8));
355}
356
357static inline void __bss_tim_clear(struct ieee80211_if_ap *bss, u16 aid)
358{
359 /*
360 * This format has been mandated by the IEEE specifications,
361 * so this line may not be changed to use the __clear_bit() format.
362 */
363 bss->tim[aid / 8] &= ~(1 << (aid % 8));
364}
365
366static void __sta_info_set_tim_bit(struct ieee80211_if_ap *bss,
367 struct sta_info *sta)
368{
Johannes Berg3e122be2008-07-09 14:40:34 +0200369 BUG_ON(!bss);
370
Johannes Berg17741cd2008-09-11 00:02:02 +0200371 __bss_tim_set(bss, sta->sta.aid);
Johannes Berg3e122be2008-07-09 14:40:34 +0200372
Johannes Bergd0709a62008-02-25 16:27:46 +0100373 if (sta->local->ops->set_tim) {
374 sta->local->tim_in_locked_section = true;
Johannes Berg17741cd2008-09-11 00:02:02 +0200375 sta->local->ops->set_tim(local_to_hw(sta->local),
376 &sta->sta, true);
Johannes Bergd0709a62008-02-25 16:27:46 +0100377 sta->local->tim_in_locked_section = false;
378 }
Johannes Berg004c8722008-02-20 11:21:35 +0100379}
380
381void sta_info_set_tim_bit(struct sta_info *sta)
382{
Johannes Bergd0709a62008-02-25 16:27:46 +0100383 unsigned long flags;
Johannes Berg004c8722008-02-20 11:21:35 +0100384
Johannes Berg3e122be2008-07-09 14:40:34 +0200385 BUG_ON(!sta->sdata->bss);
386
Johannes Bergd0709a62008-02-25 16:27:46 +0100387 spin_lock_irqsave(&sta->local->sta_lock, flags);
388 __sta_info_set_tim_bit(sta->sdata->bss, sta);
389 spin_unlock_irqrestore(&sta->local->sta_lock, flags);
Johannes Berg004c8722008-02-20 11:21:35 +0100390}
391
392static void __sta_info_clear_tim_bit(struct ieee80211_if_ap *bss,
393 struct sta_info *sta)
394{
Johannes Berg3e122be2008-07-09 14:40:34 +0200395 BUG_ON(!bss);
396
Johannes Berg17741cd2008-09-11 00:02:02 +0200397 __bss_tim_clear(bss, sta->sta.aid);
Johannes Berg3e122be2008-07-09 14:40:34 +0200398
Johannes Bergd0709a62008-02-25 16:27:46 +0100399 if (sta->local->ops->set_tim) {
400 sta->local->tim_in_locked_section = true;
Johannes Berg17741cd2008-09-11 00:02:02 +0200401 sta->local->ops->set_tim(local_to_hw(sta->local),
402 &sta->sta, false);
Johannes Bergd0709a62008-02-25 16:27:46 +0100403 sta->local->tim_in_locked_section = false;
404 }
Johannes Berg004c8722008-02-20 11:21:35 +0100405}
406
407void sta_info_clear_tim_bit(struct sta_info *sta)
408{
Johannes Bergd0709a62008-02-25 16:27:46 +0100409 unsigned long flags;
Johannes Berg004c8722008-02-20 11:21:35 +0100410
Johannes Berg3e122be2008-07-09 14:40:34 +0200411 BUG_ON(!sta->sdata->bss);
412
Johannes Bergd0709a62008-02-25 16:27:46 +0100413 spin_lock_irqsave(&sta->local->sta_lock, flags);
414 __sta_info_clear_tim_bit(sta->sdata->bss, sta);
415 spin_unlock_irqrestore(&sta->local->sta_lock, flags);
Johannes Berg004c8722008-02-20 11:21:35 +0100416}
417
Johannes Berg24723d12008-09-11 00:01:46 +0200418static void __sta_info_unlink(struct sta_info **sta)
Johannes Bergd0709a62008-02-25 16:27:46 +0100419{
420 struct ieee80211_local *local = (*sta)->local;
421 struct ieee80211_sub_if_data *sdata = (*sta)->sdata;
Johannes Bergd0709a62008-02-25 16:27:46 +0100422 /*
423 * pull caller's reference if we're already gone.
424 */
425 if (sta_info_hash_del(local, *sta)) {
426 *sta = NULL;
Michael Wube8755e2007-07-27 15:43:23 +0200427 return;
Johannes Bergd0709a62008-02-25 16:27:46 +0100428 }
Michael Wube8755e2007-07-27 15:43:23 +0200429
Johannes Berg3b967662008-04-08 17:56:52 +0200430 if ((*sta)->key) {
431 ieee80211_key_free((*sta)->key);
432 WARN_ON((*sta)->key);
433 }
434
Johannes Berg7d1559f2008-04-08 13:08:20 +0200435 list_del(&(*sta)->list);
436
Johannes Berg07346f812008-05-03 01:02:02 +0200437 if (test_and_clear_sta_flags(*sta, WLAN_STA_PS)) {
Johannes Berg3e122be2008-07-09 14:40:34 +0200438 BUG_ON(!sdata->bss);
439
440 atomic_dec(&sdata->bss->num_sta_ps);
Johannes Berg7d1559f2008-04-08 13:08:20 +0200441 __sta_info_clear_tim_bit(sdata->bss, *sta);
442 }
443
444 local->num_sta--;
445
446 if (local->ops->sta_notify) {
Johannes Berg05c914f2008-09-11 00:01:58 +0200447 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
Johannes Berg3e122be2008-07-09 14:40:34 +0200448 sdata = container_of(sdata->bss,
449 struct ieee80211_sub_if_data,
450 u.ap);
Johannes Berg7d1559f2008-04-08 13:08:20 +0200451
452 local->ops->sta_notify(local_to_hw(local), &sdata->vif,
Johannes Berg17741cd2008-09-11 00:02:02 +0200453 STA_NOTIFY_REMOVE, &(*sta)->sta);
Johannes Berg7d1559f2008-04-08 13:08:20 +0200454 }
455
456 if (ieee80211_vif_is_mesh(&sdata->vif)) {
457 mesh_accept_plinks_update(sdata);
458#ifdef CONFIG_MAC80211_MESH
459 del_timer(&(*sta)->plink_timer);
460#endif
461 }
462
463#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
Johannes Berg0c68ae262008-10-27 15:56:10 -0700464 printk(KERN_DEBUG "%s: Removed STA %pM\n",
465 wiphy_name(local->hw.wiphy), (*sta)->sta.addr);
Johannes Berg7d1559f2008-04-08 13:08:20 +0200466#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
467
Johannes Bergd0709a62008-02-25 16:27:46 +0100468 /*
Johannes Berg7d1559f2008-04-08 13:08:20 +0200469 * Finally, pull caller's reference if the STA is pinned by the
Johannes Bergd0709a62008-02-25 16:27:46 +0100470 * task that is adding the debugfs entries. In that case, we
471 * leave the STA "to be freed".
472 *
473 * The rules are not trivial, but not too complex either:
474 * (1) pin_status is only modified under the sta_lock
Johannes Berg49ec6fa22008-04-03 14:31:05 +0200475 * (2) STAs may only be pinned under the RTNL so that
476 * sta_info_flush() is guaranteed to actually destroy
477 * all STAs that are active for a given interface, this
478 * is required for correctness because otherwise we
479 * could notify a driver that an interface is going
480 * away and only after that (!) notify it about a STA
481 * on that interface going away.
482 * (3) sta_info_debugfs_add_work() will set the status
Johannes Bergd0709a62008-02-25 16:27:46 +0100483 * to PINNED when it found an item that needs a new
484 * debugfs directory created. In that case, that item
485 * must not be freed although all *RCU* users are done
486 * with it. Hence, we tell the caller of _unlink()
487 * that the item is already gone (as can happen when
488 * two tasks try to unlink/destroy at the same time)
Johannes Berg49ec6fa22008-04-03 14:31:05 +0200489 * (4) We set the pin_status to DESTROY here when we
Johannes Bergd0709a62008-02-25 16:27:46 +0100490 * find such an item.
Johannes Berg49ec6fa22008-04-03 14:31:05 +0200491 * (5) sta_info_debugfs_add_work() will reset the pin_status
Johannes Bergd0709a62008-02-25 16:27:46 +0100492 * from PINNED to NORMAL when it is done with the item,
493 * but will check for DESTROY before resetting it in
494 * which case it will free the item.
495 */
496 if ((*sta)->pin_status == STA_INFO_PIN_STAT_PINNED) {
497 (*sta)->pin_status = STA_INFO_PIN_STAT_DESTROY;
498 *sta = NULL;
499 return;
500 }
Jiri Bencf0706e822007-05-05 11:45:53 -0700501}
502
Johannes Bergd0709a62008-02-25 16:27:46 +0100503void sta_info_unlink(struct sta_info **sta)
504{
505 struct ieee80211_local *local = (*sta)->local;
506 unsigned long flags;
507
508 spin_lock_irqsave(&local->sta_lock, flags);
509 __sta_info_unlink(sta);
510 spin_unlock_irqrestore(&local->sta_lock, flags);
511}
Jiri Bencf0706e822007-05-05 11:45:53 -0700512
513static inline int sta_info_buffer_expired(struct ieee80211_local *local,
514 struct sta_info *sta,
515 struct sk_buff *skb)
516{
Johannes Berge039fa42008-05-15 12:55:29 +0200517 struct ieee80211_tx_info *info;
Jiri Bencf0706e822007-05-05 11:45:53 -0700518 int timeout;
519
520 if (!skb)
521 return 0;
522
Johannes Berge039fa42008-05-15 12:55:29 +0200523 info = IEEE80211_SKB_CB(skb);
Jiri Bencf0706e822007-05-05 11:45:53 -0700524
525 /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
526 timeout = (sta->listen_interval * local->hw.conf.beacon_int * 32 /
527 15625) * HZ;
528 if (timeout < STA_TX_BUFFER_EXPIRE)
529 timeout = STA_TX_BUFFER_EXPIRE;
Johannes Berge039fa42008-05-15 12:55:29 +0200530 return time_after(jiffies, info->control.jiffies + timeout);
Jiri Bencf0706e822007-05-05 11:45:53 -0700531}
532
533
534static void sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
535 struct sta_info *sta)
536{
537 unsigned long flags;
538 struct sk_buff *skb;
Johannes Berg836341a2008-02-20 02:07:21 +0100539 struct ieee80211_sub_if_data *sdata;
Jiri Bencf0706e822007-05-05 11:45:53 -0700540
541 if (skb_queue_empty(&sta->ps_tx_buf))
542 return;
543
544 for (;;) {
545 spin_lock_irqsave(&sta->ps_tx_buf.lock, flags);
546 skb = skb_peek(&sta->ps_tx_buf);
Johannes Berg836341a2008-02-20 02:07:21 +0100547 if (sta_info_buffer_expired(local, sta, skb))
Jiri Bencf0706e822007-05-05 11:45:53 -0700548 skb = __skb_dequeue(&sta->ps_tx_buf);
Johannes Berg836341a2008-02-20 02:07:21 +0100549 else
Jiri Bencf0706e822007-05-05 11:45:53 -0700550 skb = NULL;
551 spin_unlock_irqrestore(&sta->ps_tx_buf.lock, flags);
552
Johannes Berg836341a2008-02-20 02:07:21 +0100553 if (!skb)
Jiri Bencf0706e822007-05-05 11:45:53 -0700554 break;
Johannes Berg836341a2008-02-20 02:07:21 +0100555
Johannes Bergd0709a62008-02-25 16:27:46 +0100556 sdata = sta->sdata;
Johannes Berg836341a2008-02-20 02:07:21 +0100557 local->total_ps_buffered--;
Johannes Bergf4ea83d2008-06-30 15:10:46 +0200558#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Johannes Berg0c68ae262008-10-27 15:56:10 -0700559 printk(KERN_DEBUG "Buffered frame expired (STA %pM)\n",
560 sta->sta.addr);
Johannes Bergf4ea83d2008-06-30 15:10:46 +0200561#endif
Johannes Berg836341a2008-02-20 02:07:21 +0100562 dev_kfree_skb(skb);
563
Johannes Berg004c8722008-02-20 11:21:35 +0100564 if (skb_queue_empty(&sta->ps_tx_buf))
565 sta_info_clear_tim_bit(sta);
Jiri Bencf0706e822007-05-05 11:45:53 -0700566 }
567}
568
569
570static void sta_info_cleanup(unsigned long data)
571{
572 struct ieee80211_local *local = (struct ieee80211_local *) data;
573 struct sta_info *sta;
574
Johannes Bergd0709a62008-02-25 16:27:46 +0100575 rcu_read_lock();
576 list_for_each_entry_rcu(sta, &local->sta_list, list)
Jiri Bencf0706e822007-05-05 11:45:53 -0700577 sta_info_cleanup_expire_buffered(local, sta);
Johannes Bergd0709a62008-02-25 16:27:46 +0100578 rcu_read_unlock();
Jiri Bencf0706e822007-05-05 11:45:53 -0700579
Johannes Berg0d174402007-12-17 15:07:43 +0100580 local->sta_cleanup.expires =
581 round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL);
Jiri Bencf0706e822007-05-05 11:45:53 -0700582 add_timer(&local->sta_cleanup);
583}
584
Jiri Bence9f207f2007-05-05 11:46:38 -0700585#ifdef CONFIG_MAC80211_DEBUGFS
Jiri Slaby4d6141c2008-04-07 21:53:49 +0200586/*
587 * See comment in __sta_info_unlink,
588 * caller must hold local->sta_lock.
589 */
590static void __sta_info_pin(struct sta_info *sta)
591{
592 WARN_ON(sta->pin_status != STA_INFO_PIN_STAT_NORMAL);
593 sta->pin_status = STA_INFO_PIN_STAT_PINNED;
594}
595
596/*
597 * See comment in __sta_info_unlink, returns sta if it
598 * needs to be destroyed.
599 */
600static struct sta_info *__sta_info_unpin(struct sta_info *sta)
601{
602 struct sta_info *ret = NULL;
603 unsigned long flags;
604
605 spin_lock_irqsave(&sta->local->sta_lock, flags);
606 WARN_ON(sta->pin_status != STA_INFO_PIN_STAT_DESTROY &&
607 sta->pin_status != STA_INFO_PIN_STAT_PINNED);
608 if (sta->pin_status == STA_INFO_PIN_STAT_DESTROY)
609 ret = sta;
610 sta->pin_status = STA_INFO_PIN_STAT_NORMAL;
611 spin_unlock_irqrestore(&sta->local->sta_lock, flags);
612
613 return ret;
614}
615
Johannes Bergd0709a62008-02-25 16:27:46 +0100616static void sta_info_debugfs_add_work(struct work_struct *work)
Jiri Bence9f207f2007-05-05 11:46:38 -0700617{
618 struct ieee80211_local *local =
619 container_of(work, struct ieee80211_local, sta_debugfs_add);
620 struct sta_info *sta, *tmp;
Johannes Bergd0709a62008-02-25 16:27:46 +0100621 unsigned long flags;
Jiri Bence9f207f2007-05-05 11:46:38 -0700622
Johannes Berg49ec6fa22008-04-03 14:31:05 +0200623 /* We need to keep the RTNL across the whole pinned status. */
624 rtnl_lock();
Jiri Bence9f207f2007-05-05 11:46:38 -0700625 while (1) {
Jiri Bence9f207f2007-05-05 11:46:38 -0700626 sta = NULL;
Johannes Bergd0709a62008-02-25 16:27:46 +0100627
628 spin_lock_irqsave(&local->sta_lock, flags);
Jiri Bence9f207f2007-05-05 11:46:38 -0700629 list_for_each_entry(tmp, &local->sta_list, list) {
Johannes Berg63044e92008-10-07 12:04:29 +0200630 /*
631 * debugfs.add_has_run will be set by
632 * ieee80211_sta_debugfs_add regardless
633 * of what else it does.
634 */
635 if (!tmp->debugfs.add_has_run) {
Jiri Bence9f207f2007-05-05 11:46:38 -0700636 sta = tmp;
Johannes Bergd0709a62008-02-25 16:27:46 +0100637 __sta_info_pin(sta);
Jiri Bence9f207f2007-05-05 11:46:38 -0700638 break;
639 }
640 }
Johannes Bergd0709a62008-02-25 16:27:46 +0100641 spin_unlock_irqrestore(&local->sta_lock, flags);
Jiri Bence9f207f2007-05-05 11:46:38 -0700642
643 if (!sta)
644 break;
645
Jiri Bence9f207f2007-05-05 11:46:38 -0700646 ieee80211_sta_debugfs_add(sta);
647 rate_control_add_sta_debugfs(sta);
Johannes Bergd0709a62008-02-25 16:27:46 +0100648
649 sta = __sta_info_unpin(sta);
Johannes Berg4f6fab42008-03-31 19:23:02 +0200650 sta_info_destroy(sta);
Jiri Bence9f207f2007-05-05 11:46:38 -0700651 }
Johannes Berg49ec6fa22008-04-03 14:31:05 +0200652 rtnl_unlock();
Jiri Bence9f207f2007-05-05 11:46:38 -0700653}
654#endif
655
Johannes Berg3b967662008-04-08 17:56:52 +0200656static void __ieee80211_run_pending_flush(struct ieee80211_local *local)
Johannes Bergdc6676b2008-03-31 19:23:03 +0200657{
658 struct sta_info *sta;
659 unsigned long flags;
660
661 ASSERT_RTNL();
662
663 spin_lock_irqsave(&local->sta_lock, flags);
664 while (!list_empty(&local->sta_flush_list)) {
665 sta = list_first_entry(&local->sta_flush_list,
666 struct sta_info, list);
667 list_del(&sta->list);
668 spin_unlock_irqrestore(&local->sta_lock, flags);
669 sta_info_destroy(sta);
670 spin_lock_irqsave(&local->sta_lock, flags);
671 }
672 spin_unlock_irqrestore(&local->sta_lock, flags);
673}
674
675static void ieee80211_sta_flush_work(struct work_struct *work)
676{
677 struct ieee80211_local *local =
678 container_of(work, struct ieee80211_local, sta_flush_work);
679
680 rtnl_lock();
681 __ieee80211_run_pending_flush(local);
682 rtnl_unlock();
683}
684
Jiri Bencf0706e822007-05-05 11:45:53 -0700685void sta_info_init(struct ieee80211_local *local)
686{
Johannes Bergd0709a62008-02-25 16:27:46 +0100687 spin_lock_init(&local->sta_lock);
Jiri Bencf0706e822007-05-05 11:45:53 -0700688 INIT_LIST_HEAD(&local->sta_list);
Johannes Bergdc6676b2008-03-31 19:23:03 +0200689 INIT_LIST_HEAD(&local->sta_flush_list);
690 INIT_WORK(&local->sta_flush_work, ieee80211_sta_flush_work);
Jiri Bencf0706e822007-05-05 11:45:53 -0700691
Pavel Emelyanovb24b8a22008-01-23 21:20:07 -0800692 setup_timer(&local->sta_cleanup, sta_info_cleanup,
693 (unsigned long)local);
Johannes Berg0d174402007-12-17 15:07:43 +0100694 local->sta_cleanup.expires =
695 round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL);
Jiri Bence9f207f2007-05-05 11:46:38 -0700696
697#ifdef CONFIG_MAC80211_DEBUGFS
Johannes Bergd0709a62008-02-25 16:27:46 +0100698 INIT_WORK(&local->sta_debugfs_add, sta_info_debugfs_add_work);
Jiri Bence9f207f2007-05-05 11:46:38 -0700699#endif
Jiri Bencf0706e822007-05-05 11:45:53 -0700700}
701
702int sta_info_start(struct ieee80211_local *local)
703{
704 add_timer(&local->sta_cleanup);
705 return 0;
706}
707
708void sta_info_stop(struct ieee80211_local *local)
709{
Jiri Bencf0706e822007-05-05 11:45:53 -0700710 del_timer(&local->sta_cleanup);
Johannes Bergdc6676b2008-03-31 19:23:03 +0200711 cancel_work_sync(&local->sta_flush_work);
Johannes Berg49ec6fa22008-04-03 14:31:05 +0200712#ifdef CONFIG_MAC80211_DEBUGFS
713 /*
714 * Make sure the debugfs adding work isn't pending after this
715 * because we're about to be destroyed. It doesn't matter
716 * whether it ran or not since we're going to flush all STAs
717 * anyway.
718 */
719 cancel_work_sync(&local->sta_debugfs_add);
720#endif
Johannes Bergdc6676b2008-03-31 19:23:03 +0200721
722 rtnl_lock();
Michael Wube8755e2007-07-27 15:43:23 +0200723 sta_info_flush(local, NULL);
Johannes Bergdc6676b2008-03-31 19:23:03 +0200724 __ieee80211_run_pending_flush(local);
725 rtnl_unlock();
Jiri Bencf0706e822007-05-05 11:45:53 -0700726}
727
Jiri Bencf0706e822007-05-05 11:45:53 -0700728/**
729 * sta_info_flush - flush matching STA entries from the STA table
Johannes Berg44213b52008-02-25 16:27:49 +0100730 *
731 * Returns the number of removed STA entries.
732 *
Jiri Bencf0706e822007-05-05 11:45:53 -0700733 * @local: local interface data
Johannes Bergd0709a62008-02-25 16:27:46 +0100734 * @sdata: matching rule for the net device (sta->dev) or %NULL to match all STAs
Jiri Bencf0706e822007-05-05 11:45:53 -0700735 */
Johannes Berg44213b52008-02-25 16:27:49 +0100736int sta_info_flush(struct ieee80211_local *local,
Johannes Bergd0709a62008-02-25 16:27:46 +0100737 struct ieee80211_sub_if_data *sdata)
Jiri Bencf0706e822007-05-05 11:45:53 -0700738{
739 struct sta_info *sta, *tmp;
Michael Wube8755e2007-07-27 15:43:23 +0200740 LIST_HEAD(tmp_list);
Johannes Berg44213b52008-02-25 16:27:49 +0100741 int ret = 0;
Johannes Bergd0709a62008-02-25 16:27:46 +0100742 unsigned long flags;
Jiri Bencf0706e822007-05-05 11:45:53 -0700743
Johannes Bergd0709a62008-02-25 16:27:46 +0100744 might_sleep();
Johannes Bergdc6676b2008-03-31 19:23:03 +0200745 ASSERT_RTNL();
Johannes Bergd0709a62008-02-25 16:27:46 +0100746
747 spin_lock_irqsave(&local->sta_lock, flags);
748 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
749 if (!sdata || sdata == sta->sdata) {
750 __sta_info_unlink(&sta);
Johannes Berg44213b52008-02-25 16:27:49 +0100751 if (sta) {
Johannes Bergd0709a62008-02-25 16:27:46 +0100752 list_add_tail(&sta->list, &tmp_list);
Johannes Berg44213b52008-02-25 16:27:49 +0100753 ret++;
754 }
Michael Wube8755e2007-07-27 15:43:23 +0200755 }
Michael Wube8755e2007-07-27 15:43:23 +0200756 }
Johannes Bergd0709a62008-02-25 16:27:46 +0100757 spin_unlock_irqrestore(&local->sta_lock, flags);
758
Johannes Bergd0709a62008-02-25 16:27:46 +0100759 list_for_each_entry_safe(sta, tmp, &tmp_list, list)
760 sta_info_destroy(sta);
Johannes Berg44213b52008-02-25 16:27:49 +0100761
762 return ret;
Jiri Bencf0706e822007-05-05 11:45:53 -0700763}
Johannes Bergdc6676b2008-03-31 19:23:03 +0200764
765/**
766 * sta_info_flush_delayed - flush matching STA entries from the STA table
767 *
768 * This function unlinks all stations for a given interface and queues
769 * them for freeing. Note that the workqueue function scheduled here has
770 * to run before any new keys can be added to the system to avoid set_key()
771 * callback ordering issues.
772 *
773 * @sdata: the interface
774 */
775void sta_info_flush_delayed(struct ieee80211_sub_if_data *sdata)
776{
777 struct ieee80211_local *local = sdata->local;
778 struct sta_info *sta, *tmp;
779 unsigned long flags;
780 bool work = false;
781
782 spin_lock_irqsave(&local->sta_lock, flags);
783 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
784 if (sdata == sta->sdata) {
785 __sta_info_unlink(&sta);
786 if (sta) {
787 list_add_tail(&sta->list,
788 &local->sta_flush_list);
789 work = true;
790 }
791 }
792 }
793 if (work)
794 schedule_work(&local->sta_flush_work);
795 spin_unlock_irqrestore(&local->sta_lock, flags);
796}
Johannes Berg24723d12008-09-11 00:01:46 +0200797
798void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
799 unsigned long exp_time)
800{
801 struct ieee80211_local *local = sdata->local;
802 struct sta_info *sta, *tmp;
803 LIST_HEAD(tmp_list);
Johannes Berg24723d12008-09-11 00:01:46 +0200804 unsigned long flags;
805
806 spin_lock_irqsave(&local->sta_lock, flags);
807 list_for_each_entry_safe(sta, tmp, &local->sta_list, list)
808 if (time_after(jiffies, sta->last_rx + exp_time)) {
809#ifdef CONFIG_MAC80211_IBSS_DEBUG
Johannes Berg0c68ae262008-10-27 15:56:10 -0700810 printk(KERN_DEBUG "%s: expiring inactive STA %pM\n",
811 sdata->dev->name, sta->sta.addr);
Johannes Berg24723d12008-09-11 00:01:46 +0200812#endif
813 __sta_info_unlink(&sta);
814 if (sta)
815 list_add(&sta->list, &tmp_list);
816 }
817 spin_unlock_irqrestore(&local->sta_lock, flags);
818
819 list_for_each_entry_safe(sta, tmp, &tmp_list, list)
820 sta_info_destroy(sta);
821}
Johannes Berg17741cd2008-09-11 00:02:02 +0200822
823struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_hw *hw,
Johannes Bergc6a1fa12008-10-07 12:04:32 +0200824 const u8 *addr)
Johannes Berg17741cd2008-09-11 00:02:02 +0200825{
Johannes Berg4b7679a2008-09-18 18:14:18 +0200826 struct sta_info *sta = sta_info_get(hw_to_local(hw), addr);
Johannes Berg17741cd2008-09-11 00:02:02 +0200827
828 if (!sta)
829 return NULL;
830 return &sta->sta;
831}
832EXPORT_SYMBOL(ieee80211_find_sta);