blob: 9b72d15bc8dcb7c12978c607e057a67626c482c1 [file] [log] [blame]
Jiri Bencf0706e82007-05-05 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 Bencf0706e82007-05-05 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 Bencf0706e82007-05-05 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 Bencf0706e82007-05-05 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 Bencf0706e82007-05-05 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 Bencf0706e82007-05-05 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 Bencf0706e82007-05-05 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 Bencf0706e82007-05-05 11:45:53 -070083 }
84
Michael Wube8755e2007-07-27 15:43:23 +020085 while (s->hnext && s->hnext != sta)
Jiri Bencf0706e82007-05-05 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 Bencf0706e82007-05-05 11:45:53 -070091
Michael Wube8755e2007-07-27 15:43:23 +020092 return -ENOENT;
Jiri Bencf0706e82007-05-05 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) {
Johannes Berg17741cd2008-09-11 00:02:02 +0200102 if (compare_ether_addr(sta->sta.addr, addr) == 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 Bencf0706e82007-05-05 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{
140 DECLARE_MAC_BUF(mbuf);
141
Johannes Berg4b7679a2008-09-18 18:14:18 +0200142 rate_control_free_sta(sta);
Johannes Berg93e5deb2008-04-01 15:21:00 +0200143 rate_control_put(sta->rate_ctrl);
144
145#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
146 printk(KERN_DEBUG "%s: Destroyed STA %s\n",
Johannes Berg17741cd2008-09-11 00:02:02 +0200147 wiphy_name(local->hw.wiphy), print_mac(mbuf, sta->sta.addr));
Johannes Berg93e5deb2008-04-01 15:21:00 +0200148#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
149
150 kfree(sta);
151}
152
Johannes Bergd0709a62008-02-25 16:27:46 +0100153void sta_info_destroy(struct sta_info *sta)
Jiri Bencf0706e82007-05-05 11:45:53 -0700154{
Johannes Berg97bff8e2008-03-31 19:23:00 +0200155 struct ieee80211_local *local;
Jiri Bencf0706e82007-05-05 11:45:53 -0700156 struct sk_buff *skb;
Ron Rindjunsky07db2182007-12-25 17:00:33 +0200157 int i;
Johannes Berg73651ee2008-02-25 16:27:47 +0100158
Johannes Berg97bff8e2008-03-31 19:23:00 +0200159 might_sleep();
160
Johannes Berg73651ee2008-02-25 16:27:47 +0100161 if (!sta)
162 return;
Jiri Bencf0706e82007-05-05 11:45:53 -0700163
Johannes Berg97bff8e2008-03-31 19:23:00 +0200164 local = sta->local;
Johannes Bergd0709a62008-02-25 16:27:46 +0100165
166 rate_control_remove_sta_debugfs(sta);
167 ieee80211_sta_debugfs_remove(sta);
168
169#ifdef CONFIG_MAC80211_MESH
170 if (ieee80211_vif_is_mesh(&sta->sdata->vif))
171 mesh_plink_deactivate(sta);
172#endif
173
Johannes Berg3b967662008-04-08 17:56:52 +0200174 /*
175 * We have only unlinked the key, and actually destroying it
176 * may mean it is removed from hardware which requires that
177 * the key->sta pointer is still valid, so flush the key todo
178 * list here.
179 *
180 * ieee80211_key_todo() will synchronize_rcu() so after this
181 * nothing can reference this sta struct any more.
182 */
183 ieee80211_key_todo();
Johannes Bergd0709a62008-02-25 16:27:46 +0100184
185#ifdef CONFIG_MAC80211_MESH
186 if (ieee80211_vif_is_mesh(&sta->sdata->vif))
187 del_timer_sync(&sta->plink_timer);
188#endif
189
Jiri Bencf0706e82007-05-05 11:45:53 -0700190 while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
191 local->total_ps_buffered--;
192 dev_kfree_skb_any(skb);
193 }
Johannes Bergd0709a62008-02-25 16:27:46 +0100194
195 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL)
Jiri Bencf0706e82007-05-05 11:45:53 -0700196 dev_kfree_skb_any(skb);
Johannes Bergd0709a62008-02-25 16:27:46 +0100197
Ron Rindjunskyfe3bf0f2008-01-28 14:07:19 +0200198 for (i = 0; i < STA_TID_NUM; i++) {
Johannes Berg07346f812008-05-03 01:02:02 +0200199 spin_lock_bh(&sta->lock);
Ron Rindjunskycee24a32008-03-26 20:36:03 +0200200 if (sta->ampdu_mlme.tid_rx[i])
201 del_timer_sync(&sta->ampdu_mlme.tid_rx[i]->session_timer);
Ron Rindjunskycee24a32008-03-26 20:36:03 +0200202 if (sta->ampdu_mlme.tid_tx[i])
203 del_timer_sync(&sta->ampdu_mlme.tid_tx[i]->addba_resp_timer);
Johannes Berg07346f812008-05-03 01:02:02 +0200204 spin_unlock_bh(&sta->lock);
Ron Rindjunskyfe3bf0f2008-01-28 14:07:19 +0200205 }
Ron Rindjunskycee24a32008-03-26 20:36:03 +0200206
Johannes Berg93e5deb2008-04-01 15:21:00 +0200207 __sta_info_free(local, sta);
Jiri Bencf0706e82007-05-05 11:45:53 -0700208}
209
210
Johannes Bergd0709a62008-02-25 16:27:46 +0100211/* Caller must hold local->sta_lock */
212static void sta_info_hash_add(struct ieee80211_local *local,
213 struct sta_info *sta)
Jiri Bencf0706e82007-05-05 11:45:53 -0700214{
Johannes Berg17741cd2008-09-11 00:02:02 +0200215 sta->hnext = local->sta_hash[STA_HASH(sta->sta.addr)];
216 rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)], sta);
Jiri Bencf0706e82007-05-05 11:45:53 -0700217}
Jiri Bencf0706e82007-05-05 11:45:53 -0700218
Johannes Berg73651ee2008-02-25 16:27:47 +0100219struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
220 u8 *addr, gfp_t gfp)
Jiri Bencf0706e82007-05-05 11:45:53 -0700221{
Johannes Bergd0709a62008-02-25 16:27:46 +0100222 struct ieee80211_local *local = sdata->local;
Jiri Bencf0706e82007-05-05 11:45:53 -0700223 struct sta_info *sta;
Ron Rindjunsky16c5f152007-12-25 17:00:34 +0200224 int i;
Johannes Berg73651ee2008-02-25 16:27:47 +0100225 DECLARE_MAC_BUF(mbuf);
Jiri Bencf0706e82007-05-05 11:45:53 -0700226
Johannes Berg17741cd2008-09-11 00:02:02 +0200227 sta = kzalloc(sizeof(*sta) + local->hw.sta_data_size, gfp);
Jiri Bencf0706e82007-05-05 11:45:53 -0700228 if (!sta)
Johannes Berg73651ee2008-02-25 16:27:47 +0100229 return NULL;
Jiri Bencf0706e82007-05-05 11:45:53 -0700230
Johannes Berg07346f812008-05-03 01:02:02 +0200231 spin_lock_init(&sta->lock);
Johannes Berg5a9f7b02008-06-18 14:58:09 +0200232 spin_lock_init(&sta->flaglock);
Johannes Berg07346f812008-05-03 01:02:02 +0200233
Johannes Berg17741cd2008-09-11 00:02:02 +0200234 memcpy(sta->sta.addr, addr, ETH_ALEN);
Johannes Bergd0709a62008-02-25 16:27:46 +0100235 sta->local = local;
236 sta->sdata = sdata;
Jiri Bencf0706e82007-05-05 11:45:53 -0700237
238 sta->rate_ctrl = rate_control_get(local->rate_ctrl);
Johannes Bergd0709a62008-02-25 16:27:46 +0100239 sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl,
Johannes Berg4b7679a2008-09-18 18:14:18 +0200240 &sta->sta, gfp);
Jiri Bencf0706e82007-05-05 11:45:53 -0700241 if (!sta->rate_ctrl_priv) {
242 rate_control_put(sta->rate_ctrl);
Jiri Bencf0706e82007-05-05 11:45:53 -0700243 kfree(sta);
Johannes Berg73651ee2008-02-25 16:27:47 +0100244 return NULL;
Jiri Bencf0706e82007-05-05 11:45:53 -0700245 }
246
Ron Rindjunsky16c5f152007-12-25 17:00:34 +0200247 for (i = 0; i < STA_TID_NUM; i++) {
248 /* timer_to_tid must be initialized with identity mapping to
249 * enable session_timer's data differentiation. refer to
250 * sta_rx_agg_session_timer_expired for useage */
251 sta->timer_to_tid[i] = i;
Ron Rindjunskyfe3bf0f2008-01-28 14:07:19 +0200252 /* tid to tx queue: initialize according to HW (0 is valid) */
Johannes Berge2530082008-05-17 00:57:14 +0200253 sta->tid_to_tx_q[i] = ieee80211_num_queues(&local->hw);
Ron Rindjunskycee24a32008-03-26 20:36:03 +0200254 /* rx */
255 sta->ampdu_mlme.tid_state_rx[i] = HT_AGG_STATE_IDLE;
256 sta->ampdu_mlme.tid_rx[i] = NULL;
257 /* tx */
258 sta->ampdu_mlme.tid_state_tx[i] = HT_AGG_STATE_IDLE;
259 sta->ampdu_mlme.tid_tx[i] = NULL;
260 sta->ampdu_mlme.addba_req_num[i] = 0;
Ron Rindjunsky16c5f152007-12-25 17:00:34 +0200261 }
Jiri Bencf0706e82007-05-05 11:45:53 -0700262 skb_queue_head_init(&sta->ps_tx_buf);
263 skb_queue_head_init(&sta->tx_filtered);
Johannes Berg73651ee2008-02-25 16:27:47 +0100264
265#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
266 printk(KERN_DEBUG "%s: Allocated STA %s\n",
Johannes Berg17741cd2008-09-11 00:02:02 +0200267 wiphy_name(local->hw.wiphy), print_mac(mbuf, sta->sta.addr));
Johannes Berg73651ee2008-02-25 16:27:47 +0100268#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
269
Johannes Berg03e44972008-02-27 09:56:40 +0100270#ifdef CONFIG_MAC80211_MESH
Luis Carlos Cobob4e08ea2008-02-29 15:46:08 -0800271 sta->plink_state = PLINK_LISTEN;
Johannes Berg03e44972008-02-27 09:56:40 +0100272 init_timer(&sta->plink_timer);
273#endif
274
Johannes Berg73651ee2008-02-25 16:27:47 +0100275 return sta;
276}
277
278int sta_info_insert(struct sta_info *sta)
279{
280 struct ieee80211_local *local = sta->local;
281 struct ieee80211_sub_if_data *sdata = sta->sdata;
282 unsigned long flags;
Johannes Berg93e5deb2008-04-01 15:21:00 +0200283 int err = 0;
Johannes Berg73651ee2008-02-25 16:27:47 +0100284 DECLARE_MAC_BUF(mac);
285
Johannes Berg03e44972008-02-27 09:56:40 +0100286 /*
287 * Can't be a WARN_ON because it can be triggered through a race:
288 * something inserts a STA (on one CPU) without holding the RTNL
289 * and another CPU turns off the net device.
290 */
Johannes Berg93e5deb2008-04-01 15:21:00 +0200291 if (unlikely(!netif_running(sdata->dev))) {
292 err = -ENETDOWN;
293 goto out_free;
294 }
Johannes Berg03e44972008-02-27 09:56:40 +0100295
Johannes Berg17741cd2008-09-11 00:02:02 +0200296 if (WARN_ON(compare_ether_addr(sta->sta.addr, sdata->dev->dev_addr) == 0 ||
297 is_multicast_ether_addr(sta->sta.addr))) {
Johannes Berg93e5deb2008-04-01 15:21:00 +0200298 err = -EINVAL;
299 goto out_free;
300 }
Johannes Berg44213b52008-02-25 16:27:49 +0100301
Johannes Bergd0709a62008-02-25 16:27:46 +0100302 spin_lock_irqsave(&local->sta_lock, flags);
Johannes Berg43ba7e92008-02-21 14:09:30 +0100303 /* check if STA exists already */
Johannes Berg4b7679a2008-09-18 18:14:18 +0200304 if (sta_info_get(local, sta->sta.addr)) {
Johannes Bergd0709a62008-02-25 16:27:46 +0100305 spin_unlock_irqrestore(&local->sta_lock, flags);
Johannes Berg93e5deb2008-04-01 15:21:00 +0200306 err = -EEXIST;
307 goto out_free;
Johannes Berg43ba7e92008-02-21 14:09:30 +0100308 }
Jiri Bencf0706e82007-05-05 11:45:53 -0700309 list_add(&sta->list, &local->sta_list);
310 local->num_sta++;
311 sta_info_hash_add(local, sta);
Johannes Berg32bfd352007-12-19 01:31:26 +0100312
Johannes Bergd0709a62008-02-25 16:27:46 +0100313 /* notify driver */
314 if (local->ops->sta_notify) {
Johannes Berg05c914f2008-09-11 00:01:58 +0200315 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
Johannes Berg3e122be2008-07-09 14:40:34 +0200316 sdata = container_of(sdata->bss,
317 struct ieee80211_sub_if_data,
318 u.ap);
Johannes Berg32bfd352007-12-19 01:31:26 +0100319
320 local->ops->sta_notify(local_to_hw(local), &sdata->vif,
Johannes Berg17741cd2008-09-11 00:02:02 +0200321 STA_NOTIFY_ADD, &sta->sta);
Johannes Berg32bfd352007-12-19 01:31:26 +0100322 }
Johannes Bergd0709a62008-02-25 16:27:46 +0100323
Jiri Bencf0706e82007-05-05 11:45:53 -0700324#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
Johannes Berg73651ee2008-02-25 16:27:47 +0100325 printk(KERN_DEBUG "%s: Inserted STA %s\n",
Johannes Berg17741cd2008-09-11 00:02:02 +0200326 wiphy_name(local->hw.wiphy), print_mac(mac, sta->sta.addr));
Jiri Bencf0706e82007-05-05 11:45:53 -0700327#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
328
Johannes Berg73651ee2008-02-25 16:27:47 +0100329 spin_unlock_irqrestore(&local->sta_lock, flags);
330
Jiri Bence9f207f2007-05-05 11:46:38 -0700331#ifdef CONFIG_MAC80211_DEBUGFS
Johannes Berg93e5deb2008-04-01 15:21:00 +0200332 /*
333 * Debugfs entry adding might sleep, so schedule process
Michael Wube8755e2007-07-27 15:43:23 +0200334 * context task for adding entry for STAs that do not yet
Johannes Berg93e5deb2008-04-01 15:21:00 +0200335 * have one.
336 * NOTE: due to auto-freeing semantics this may only be done
337 * if the insertion is successful!
338 */
Johannes Berg49ec6fa22008-04-03 14:31:05 +0200339 schedule_work(&local->sta_debugfs_add);
Jiri Bence9f207f2007-05-05 11:46:38 -0700340#endif
341
Johannes Berg73651ee2008-02-25 16:27:47 +0100342 if (ieee80211_vif_is_mesh(&sdata->vif))
343 mesh_accept_plinks_update(sdata);
344
345 return 0;
Johannes Berg93e5deb2008-04-01 15:21:00 +0200346 out_free:
347 BUG_ON(!err);
348 __sta_info_free(local, sta);
349 return err;
Jiri Bencf0706e82007-05-05 11:45:53 -0700350}
351
Johannes Berg004c8722008-02-20 11:21:35 +0100352static inline void __bss_tim_set(struct ieee80211_if_ap *bss, u16 aid)
353{
354 /*
355 * This format has been mandated by the IEEE specifications,
356 * so this line may not be changed to use the __set_bit() format.
357 */
358 bss->tim[aid / 8] |= (1 << (aid % 8));
359}
360
361static inline void __bss_tim_clear(struct ieee80211_if_ap *bss, u16 aid)
362{
363 /*
364 * This format has been mandated by the IEEE specifications,
365 * so this line may not be changed to use the __clear_bit() format.
366 */
367 bss->tim[aid / 8] &= ~(1 << (aid % 8));
368}
369
370static void __sta_info_set_tim_bit(struct ieee80211_if_ap *bss,
371 struct sta_info *sta)
372{
Johannes Berg3e122be2008-07-09 14:40:34 +0200373 BUG_ON(!bss);
374
Johannes Berg17741cd2008-09-11 00:02:02 +0200375 __bss_tim_set(bss, sta->sta.aid);
Johannes Berg3e122be2008-07-09 14:40:34 +0200376
Johannes Bergd0709a62008-02-25 16:27:46 +0100377 if (sta->local->ops->set_tim) {
378 sta->local->tim_in_locked_section = true;
Johannes Berg17741cd2008-09-11 00:02:02 +0200379 sta->local->ops->set_tim(local_to_hw(sta->local),
380 &sta->sta, true);
Johannes Bergd0709a62008-02-25 16:27:46 +0100381 sta->local->tim_in_locked_section = false;
382 }
Johannes Berg004c8722008-02-20 11:21:35 +0100383}
384
385void sta_info_set_tim_bit(struct sta_info *sta)
386{
Johannes Bergd0709a62008-02-25 16:27:46 +0100387 unsigned long flags;
Johannes Berg004c8722008-02-20 11:21:35 +0100388
Johannes Berg3e122be2008-07-09 14:40:34 +0200389 BUG_ON(!sta->sdata->bss);
390
Johannes Bergd0709a62008-02-25 16:27:46 +0100391 spin_lock_irqsave(&sta->local->sta_lock, flags);
392 __sta_info_set_tim_bit(sta->sdata->bss, sta);
393 spin_unlock_irqrestore(&sta->local->sta_lock, flags);
Johannes Berg004c8722008-02-20 11:21:35 +0100394}
395
396static void __sta_info_clear_tim_bit(struct ieee80211_if_ap *bss,
397 struct sta_info *sta)
398{
Johannes Berg3e122be2008-07-09 14:40:34 +0200399 BUG_ON(!bss);
400
Johannes Berg17741cd2008-09-11 00:02:02 +0200401 __bss_tim_clear(bss, sta->sta.aid);
Johannes Berg3e122be2008-07-09 14:40:34 +0200402
Johannes Bergd0709a62008-02-25 16:27:46 +0100403 if (sta->local->ops->set_tim) {
404 sta->local->tim_in_locked_section = true;
Johannes Berg17741cd2008-09-11 00:02:02 +0200405 sta->local->ops->set_tim(local_to_hw(sta->local),
406 &sta->sta, false);
Johannes Bergd0709a62008-02-25 16:27:46 +0100407 sta->local->tim_in_locked_section = false;
408 }
Johannes Berg004c8722008-02-20 11:21:35 +0100409}
410
411void sta_info_clear_tim_bit(struct sta_info *sta)
412{
Johannes Bergd0709a62008-02-25 16:27:46 +0100413 unsigned long flags;
Johannes Berg004c8722008-02-20 11:21:35 +0100414
Johannes Berg3e122be2008-07-09 14:40:34 +0200415 BUG_ON(!sta->sdata->bss);
416
Johannes Bergd0709a62008-02-25 16:27:46 +0100417 spin_lock_irqsave(&sta->local->sta_lock, flags);
418 __sta_info_clear_tim_bit(sta->sdata->bss, sta);
419 spin_unlock_irqrestore(&sta->local->sta_lock, flags);
Johannes Berg004c8722008-02-20 11:21:35 +0100420}
421
Johannes Berg24723d12008-09-11 00:01:46 +0200422static void __sta_info_unlink(struct sta_info **sta)
Johannes Bergd0709a62008-02-25 16:27:46 +0100423{
424 struct ieee80211_local *local = (*sta)->local;
425 struct ieee80211_sub_if_data *sdata = (*sta)->sdata;
426#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
427 DECLARE_MAC_BUF(mbuf);
428#endif
429 /*
430 * pull caller's reference if we're already gone.
431 */
432 if (sta_info_hash_del(local, *sta)) {
433 *sta = NULL;
Michael Wube8755e2007-07-27 15:43:23 +0200434 return;
Johannes Bergd0709a62008-02-25 16:27:46 +0100435 }
Michael Wube8755e2007-07-27 15:43:23 +0200436
Johannes Berg3b967662008-04-08 17:56:52 +0200437 if ((*sta)->key) {
438 ieee80211_key_free((*sta)->key);
439 WARN_ON((*sta)->key);
440 }
441
Johannes Berg7d1559f2008-04-08 13:08:20 +0200442 list_del(&(*sta)->list);
443
Johannes Berg07346f812008-05-03 01:02:02 +0200444 if (test_and_clear_sta_flags(*sta, WLAN_STA_PS)) {
Johannes Berg3e122be2008-07-09 14:40:34 +0200445 BUG_ON(!sdata->bss);
446
447 atomic_dec(&sdata->bss->num_sta_ps);
Johannes Berg7d1559f2008-04-08 13:08:20 +0200448 __sta_info_clear_tim_bit(sdata->bss, *sta);
449 }
450
451 local->num_sta--;
452
453 if (local->ops->sta_notify) {
Johannes Berg05c914f2008-09-11 00:01:58 +0200454 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
Johannes Berg3e122be2008-07-09 14:40:34 +0200455 sdata = container_of(sdata->bss,
456 struct ieee80211_sub_if_data,
457 u.ap);
Johannes Berg7d1559f2008-04-08 13:08:20 +0200458
459 local->ops->sta_notify(local_to_hw(local), &sdata->vif,
Johannes Berg17741cd2008-09-11 00:02:02 +0200460 STA_NOTIFY_REMOVE, &(*sta)->sta);
Johannes Berg7d1559f2008-04-08 13:08:20 +0200461 }
462
463 if (ieee80211_vif_is_mesh(&sdata->vif)) {
464 mesh_accept_plinks_update(sdata);
465#ifdef CONFIG_MAC80211_MESH
466 del_timer(&(*sta)->plink_timer);
467#endif
468 }
469
470#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
471 printk(KERN_DEBUG "%s: Removed STA %s\n",
Johannes Berg17741cd2008-09-11 00:02:02 +0200472 wiphy_name(local->hw.wiphy), print_mac(mbuf, (*sta)->sta.addr));
Johannes Berg7d1559f2008-04-08 13:08:20 +0200473#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
474
Johannes Bergd0709a62008-02-25 16:27:46 +0100475 /*
Johannes Berg7d1559f2008-04-08 13:08:20 +0200476 * Finally, pull caller's reference if the STA is pinned by the
Johannes Bergd0709a62008-02-25 16:27:46 +0100477 * task that is adding the debugfs entries. In that case, we
478 * leave the STA "to be freed".
479 *
480 * The rules are not trivial, but not too complex either:
481 * (1) pin_status is only modified under the sta_lock
Johannes Berg49ec6fa22008-04-03 14:31:05 +0200482 * (2) STAs may only be pinned under the RTNL so that
483 * sta_info_flush() is guaranteed to actually destroy
484 * all STAs that are active for a given interface, this
485 * is required for correctness because otherwise we
486 * could notify a driver that an interface is going
487 * away and only after that (!) notify it about a STA
488 * on that interface going away.
489 * (3) sta_info_debugfs_add_work() will set the status
Johannes Bergd0709a62008-02-25 16:27:46 +0100490 * to PINNED when it found an item that needs a new
491 * debugfs directory created. In that case, that item
492 * must not be freed although all *RCU* users are done
493 * with it. Hence, we tell the caller of _unlink()
494 * that the item is already gone (as can happen when
495 * two tasks try to unlink/destroy at the same time)
Johannes Berg49ec6fa22008-04-03 14:31:05 +0200496 * (4) We set the pin_status to DESTROY here when we
Johannes Bergd0709a62008-02-25 16:27:46 +0100497 * find such an item.
Johannes Berg49ec6fa22008-04-03 14:31:05 +0200498 * (5) sta_info_debugfs_add_work() will reset the pin_status
Johannes Bergd0709a62008-02-25 16:27:46 +0100499 * from PINNED to NORMAL when it is done with the item,
500 * but will check for DESTROY before resetting it in
501 * which case it will free the item.
502 */
503 if ((*sta)->pin_status == STA_INFO_PIN_STAT_PINNED) {
504 (*sta)->pin_status = STA_INFO_PIN_STAT_DESTROY;
505 *sta = NULL;
506 return;
507 }
Jiri Bencf0706e82007-05-05 11:45:53 -0700508}
509
Johannes Bergd0709a62008-02-25 16:27:46 +0100510void sta_info_unlink(struct sta_info **sta)
511{
512 struct ieee80211_local *local = (*sta)->local;
513 unsigned long flags;
514
515 spin_lock_irqsave(&local->sta_lock, flags);
516 __sta_info_unlink(sta);
517 spin_unlock_irqrestore(&local->sta_lock, flags);
518}
Jiri Bencf0706e82007-05-05 11:45:53 -0700519
520static inline int sta_info_buffer_expired(struct ieee80211_local *local,
521 struct sta_info *sta,
522 struct sk_buff *skb)
523{
Johannes Berge039fa42008-05-15 12:55:29 +0200524 struct ieee80211_tx_info *info;
Jiri Bencf0706e82007-05-05 11:45:53 -0700525 int timeout;
526
527 if (!skb)
528 return 0;
529
Johannes Berge039fa42008-05-15 12:55:29 +0200530 info = IEEE80211_SKB_CB(skb);
Jiri Bencf0706e82007-05-05 11:45:53 -0700531
532 /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
533 timeout = (sta->listen_interval * local->hw.conf.beacon_int * 32 /
534 15625) * HZ;
535 if (timeout < STA_TX_BUFFER_EXPIRE)
536 timeout = STA_TX_BUFFER_EXPIRE;
Johannes Berge039fa42008-05-15 12:55:29 +0200537 return time_after(jiffies, info->control.jiffies + timeout);
Jiri Bencf0706e82007-05-05 11:45:53 -0700538}
539
540
541static void sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
542 struct sta_info *sta)
543{
544 unsigned long flags;
545 struct sk_buff *skb;
Johannes Berg836341a2008-02-20 02:07:21 +0100546 struct ieee80211_sub_if_data *sdata;
Joe Perches0795af52007-10-03 17:59:30 -0700547 DECLARE_MAC_BUF(mac);
Jiri Bencf0706e82007-05-05 11:45:53 -0700548
549 if (skb_queue_empty(&sta->ps_tx_buf))
550 return;
551
552 for (;;) {
553 spin_lock_irqsave(&sta->ps_tx_buf.lock, flags);
554 skb = skb_peek(&sta->ps_tx_buf);
Johannes Berg836341a2008-02-20 02:07:21 +0100555 if (sta_info_buffer_expired(local, sta, skb))
Jiri Bencf0706e82007-05-05 11:45:53 -0700556 skb = __skb_dequeue(&sta->ps_tx_buf);
Johannes Berg836341a2008-02-20 02:07:21 +0100557 else
Jiri Bencf0706e82007-05-05 11:45:53 -0700558 skb = NULL;
559 spin_unlock_irqrestore(&sta->ps_tx_buf.lock, flags);
560
Johannes Berg836341a2008-02-20 02:07:21 +0100561 if (!skb)
Jiri Bencf0706e82007-05-05 11:45:53 -0700562 break;
Johannes Berg836341a2008-02-20 02:07:21 +0100563
Johannes Bergd0709a62008-02-25 16:27:46 +0100564 sdata = sta->sdata;
Johannes Berg836341a2008-02-20 02:07:21 +0100565 local->total_ps_buffered--;
Johannes Bergf4ea83d2008-06-30 15:10:46 +0200566#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Johannes Berg836341a2008-02-20 02:07:21 +0100567 printk(KERN_DEBUG "Buffered frame expired (STA "
Johannes Berg17741cd2008-09-11 00:02:02 +0200568 "%s)\n", print_mac(mac, sta->sta.addr));
Johannes Bergf4ea83d2008-06-30 15:10:46 +0200569#endif
Johannes Berg836341a2008-02-20 02:07:21 +0100570 dev_kfree_skb(skb);
571
Johannes Berg004c8722008-02-20 11:21:35 +0100572 if (skb_queue_empty(&sta->ps_tx_buf))
573 sta_info_clear_tim_bit(sta);
Jiri Bencf0706e82007-05-05 11:45:53 -0700574 }
575}
576
577
578static void sta_info_cleanup(unsigned long data)
579{
580 struct ieee80211_local *local = (struct ieee80211_local *) data;
581 struct sta_info *sta;
582
Johannes Bergd0709a62008-02-25 16:27:46 +0100583 rcu_read_lock();
584 list_for_each_entry_rcu(sta, &local->sta_list, list)
Jiri Bencf0706e82007-05-05 11:45:53 -0700585 sta_info_cleanup_expire_buffered(local, sta);
Johannes Bergd0709a62008-02-25 16:27:46 +0100586 rcu_read_unlock();
Jiri Bencf0706e82007-05-05 11:45:53 -0700587
Johannes Berg0d174402007-12-17 15:07:43 +0100588 local->sta_cleanup.expires =
589 round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL);
Jiri Bencf0706e82007-05-05 11:45:53 -0700590 add_timer(&local->sta_cleanup);
591}
592
Jiri Bence9f207f2007-05-05 11:46:38 -0700593#ifdef CONFIG_MAC80211_DEBUGFS
Jiri Slaby4d6141c32008-04-07 21:53:49 +0200594/*
595 * See comment in __sta_info_unlink,
596 * caller must hold local->sta_lock.
597 */
598static void __sta_info_pin(struct sta_info *sta)
599{
600 WARN_ON(sta->pin_status != STA_INFO_PIN_STAT_NORMAL);
601 sta->pin_status = STA_INFO_PIN_STAT_PINNED;
602}
603
604/*
605 * See comment in __sta_info_unlink, returns sta if it
606 * needs to be destroyed.
607 */
608static struct sta_info *__sta_info_unpin(struct sta_info *sta)
609{
610 struct sta_info *ret = NULL;
611 unsigned long flags;
612
613 spin_lock_irqsave(&sta->local->sta_lock, flags);
614 WARN_ON(sta->pin_status != STA_INFO_PIN_STAT_DESTROY &&
615 sta->pin_status != STA_INFO_PIN_STAT_PINNED);
616 if (sta->pin_status == STA_INFO_PIN_STAT_DESTROY)
617 ret = sta;
618 sta->pin_status = STA_INFO_PIN_STAT_NORMAL;
619 spin_unlock_irqrestore(&sta->local->sta_lock, flags);
620
621 return ret;
622}
623
Johannes Bergd0709a62008-02-25 16:27:46 +0100624static void sta_info_debugfs_add_work(struct work_struct *work)
Jiri Bence9f207f2007-05-05 11:46:38 -0700625{
626 struct ieee80211_local *local =
627 container_of(work, struct ieee80211_local, sta_debugfs_add);
628 struct sta_info *sta, *tmp;
Johannes Bergd0709a62008-02-25 16:27:46 +0100629 unsigned long flags;
Jiri Bence9f207f2007-05-05 11:46:38 -0700630
Johannes Berg49ec6fa22008-04-03 14:31:05 +0200631 /* We need to keep the RTNL across the whole pinned status. */
632 rtnl_lock();
Jiri Bence9f207f2007-05-05 11:46:38 -0700633 while (1) {
Jiri Bence9f207f2007-05-05 11:46:38 -0700634 sta = NULL;
Johannes Bergd0709a62008-02-25 16:27:46 +0100635
636 spin_lock_irqsave(&local->sta_lock, flags);
Jiri Bence9f207f2007-05-05 11:46:38 -0700637 list_for_each_entry(tmp, &local->sta_list, list) {
Michael Wube8755e2007-07-27 15:43:23 +0200638 if (!tmp->debugfs.dir) {
Jiri Bence9f207f2007-05-05 11:46:38 -0700639 sta = tmp;
Johannes Bergd0709a62008-02-25 16:27:46 +0100640 __sta_info_pin(sta);
Jiri Bence9f207f2007-05-05 11:46:38 -0700641 break;
642 }
643 }
Johannes Bergd0709a62008-02-25 16:27:46 +0100644 spin_unlock_irqrestore(&local->sta_lock, flags);
Jiri Bence9f207f2007-05-05 11:46:38 -0700645
646 if (!sta)
647 break;
648
Jiri Bence9f207f2007-05-05 11:46:38 -0700649 ieee80211_sta_debugfs_add(sta);
650 rate_control_add_sta_debugfs(sta);
Johannes Bergd0709a62008-02-25 16:27:46 +0100651
652 sta = __sta_info_unpin(sta);
Johannes Berg4f6fab42008-03-31 19:23:02 +0200653 sta_info_destroy(sta);
Jiri Bence9f207f2007-05-05 11:46:38 -0700654 }
Johannes Berg49ec6fa22008-04-03 14:31:05 +0200655 rtnl_unlock();
Jiri Bence9f207f2007-05-05 11:46:38 -0700656}
657#endif
658
Johannes Berg3b967662008-04-08 17:56:52 +0200659static void __ieee80211_run_pending_flush(struct ieee80211_local *local)
Johannes Bergdc6676b2008-03-31 19:23:03 +0200660{
661 struct sta_info *sta;
662 unsigned long flags;
663
664 ASSERT_RTNL();
665
666 spin_lock_irqsave(&local->sta_lock, flags);
667 while (!list_empty(&local->sta_flush_list)) {
668 sta = list_first_entry(&local->sta_flush_list,
669 struct sta_info, list);
670 list_del(&sta->list);
671 spin_unlock_irqrestore(&local->sta_lock, flags);
672 sta_info_destroy(sta);
673 spin_lock_irqsave(&local->sta_lock, flags);
674 }
675 spin_unlock_irqrestore(&local->sta_lock, flags);
676}
677
678static void ieee80211_sta_flush_work(struct work_struct *work)
679{
680 struct ieee80211_local *local =
681 container_of(work, struct ieee80211_local, sta_flush_work);
682
683 rtnl_lock();
684 __ieee80211_run_pending_flush(local);
685 rtnl_unlock();
686}
687
Jiri Bencf0706e82007-05-05 11:45:53 -0700688void sta_info_init(struct ieee80211_local *local)
689{
Johannes Bergd0709a62008-02-25 16:27:46 +0100690 spin_lock_init(&local->sta_lock);
Jiri Bencf0706e82007-05-05 11:45:53 -0700691 INIT_LIST_HEAD(&local->sta_list);
Johannes Bergdc6676b2008-03-31 19:23:03 +0200692 INIT_LIST_HEAD(&local->sta_flush_list);
693 INIT_WORK(&local->sta_flush_work, ieee80211_sta_flush_work);
Jiri Bencf0706e82007-05-05 11:45:53 -0700694
Pavel Emelyanovb24b8a22008-01-23 21:20:07 -0800695 setup_timer(&local->sta_cleanup, sta_info_cleanup,
696 (unsigned long)local);
Johannes Berg0d174402007-12-17 15:07:43 +0100697 local->sta_cleanup.expires =
698 round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL);
Jiri Bence9f207f2007-05-05 11:46:38 -0700699
700#ifdef CONFIG_MAC80211_DEBUGFS
Johannes Bergd0709a62008-02-25 16:27:46 +0100701 INIT_WORK(&local->sta_debugfs_add, sta_info_debugfs_add_work);
Jiri Bence9f207f2007-05-05 11:46:38 -0700702#endif
Jiri Bencf0706e82007-05-05 11:45:53 -0700703}
704
705int sta_info_start(struct ieee80211_local *local)
706{
707 add_timer(&local->sta_cleanup);
708 return 0;
709}
710
711void sta_info_stop(struct ieee80211_local *local)
712{
Jiri Bencf0706e82007-05-05 11:45:53 -0700713 del_timer(&local->sta_cleanup);
Johannes Bergdc6676b2008-03-31 19:23:03 +0200714 cancel_work_sync(&local->sta_flush_work);
Johannes Berg49ec6fa22008-04-03 14:31:05 +0200715#ifdef CONFIG_MAC80211_DEBUGFS
716 /*
717 * Make sure the debugfs adding work isn't pending after this
718 * because we're about to be destroyed. It doesn't matter
719 * whether it ran or not since we're going to flush all STAs
720 * anyway.
721 */
722 cancel_work_sync(&local->sta_debugfs_add);
723#endif
Johannes Bergdc6676b2008-03-31 19:23:03 +0200724
725 rtnl_lock();
Michael Wube8755e2007-07-27 15:43:23 +0200726 sta_info_flush(local, NULL);
Johannes Bergdc6676b2008-03-31 19:23:03 +0200727 __ieee80211_run_pending_flush(local);
728 rtnl_unlock();
Jiri Bencf0706e82007-05-05 11:45:53 -0700729}
730
Jiri Bencf0706e82007-05-05 11:45:53 -0700731/**
732 * sta_info_flush - flush matching STA entries from the STA table
Johannes Berg44213b52008-02-25 16:27:49 +0100733 *
734 * Returns the number of removed STA entries.
735 *
Jiri Bencf0706e82007-05-05 11:45:53 -0700736 * @local: local interface data
Johannes Bergd0709a62008-02-25 16:27:46 +0100737 * @sdata: matching rule for the net device (sta->dev) or %NULL to match all STAs
Jiri Bencf0706e82007-05-05 11:45:53 -0700738 */
Johannes Berg44213b52008-02-25 16:27:49 +0100739int sta_info_flush(struct ieee80211_local *local,
Johannes Bergd0709a62008-02-25 16:27:46 +0100740 struct ieee80211_sub_if_data *sdata)
Jiri Bencf0706e82007-05-05 11:45:53 -0700741{
742 struct sta_info *sta, *tmp;
Michael Wube8755e2007-07-27 15:43:23 +0200743 LIST_HEAD(tmp_list);
Johannes Berg44213b52008-02-25 16:27:49 +0100744 int ret = 0;
Johannes Bergd0709a62008-02-25 16:27:46 +0100745 unsigned long flags;
Jiri Bencf0706e82007-05-05 11:45:53 -0700746
Johannes Bergd0709a62008-02-25 16:27:46 +0100747 might_sleep();
Johannes Bergdc6676b2008-03-31 19:23:03 +0200748 ASSERT_RTNL();
Johannes Bergd0709a62008-02-25 16:27:46 +0100749
750 spin_lock_irqsave(&local->sta_lock, flags);
751 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
752 if (!sdata || sdata == sta->sdata) {
753 __sta_info_unlink(&sta);
Johannes Berg44213b52008-02-25 16:27:49 +0100754 if (sta) {
Johannes Bergd0709a62008-02-25 16:27:46 +0100755 list_add_tail(&sta->list, &tmp_list);
Johannes Berg44213b52008-02-25 16:27:49 +0100756 ret++;
757 }
Michael Wube8755e2007-07-27 15:43:23 +0200758 }
Michael Wube8755e2007-07-27 15:43:23 +0200759 }
Johannes Bergd0709a62008-02-25 16:27:46 +0100760 spin_unlock_irqrestore(&local->sta_lock, flags);
761
Johannes Bergd0709a62008-02-25 16:27:46 +0100762 list_for_each_entry_safe(sta, tmp, &tmp_list, list)
763 sta_info_destroy(sta);
Johannes Berg44213b52008-02-25 16:27:49 +0100764
765 return ret;
Jiri Bencf0706e82007-05-05 11:45:53 -0700766}
Johannes Bergdc6676b2008-03-31 19:23:03 +0200767
768/**
769 * sta_info_flush_delayed - flush matching STA entries from the STA table
770 *
771 * This function unlinks all stations for a given interface and queues
772 * them for freeing. Note that the workqueue function scheduled here has
773 * to run before any new keys can be added to the system to avoid set_key()
774 * callback ordering issues.
775 *
776 * @sdata: the interface
777 */
778void sta_info_flush_delayed(struct ieee80211_sub_if_data *sdata)
779{
780 struct ieee80211_local *local = sdata->local;
781 struct sta_info *sta, *tmp;
782 unsigned long flags;
783 bool work = false;
784
785 spin_lock_irqsave(&local->sta_lock, flags);
786 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
787 if (sdata == sta->sdata) {
788 __sta_info_unlink(&sta);
789 if (sta) {
790 list_add_tail(&sta->list,
791 &local->sta_flush_list);
792 work = true;
793 }
794 }
795 }
796 if (work)
797 schedule_work(&local->sta_flush_work);
798 spin_unlock_irqrestore(&local->sta_lock, flags);
799}
Johannes Berg24723d12008-09-11 00:01:46 +0200800
801void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
802 unsigned long exp_time)
803{
804 struct ieee80211_local *local = sdata->local;
805 struct sta_info *sta, *tmp;
806 LIST_HEAD(tmp_list);
807 DECLARE_MAC_BUF(mac);
808 unsigned long flags;
809
810 spin_lock_irqsave(&local->sta_lock, flags);
811 list_for_each_entry_safe(sta, tmp, &local->sta_list, list)
812 if (time_after(jiffies, sta->last_rx + exp_time)) {
813#ifdef CONFIG_MAC80211_IBSS_DEBUG
814 printk(KERN_DEBUG "%s: expiring inactive STA %s\n",
Johannes Berg17741cd2008-09-11 00:02:02 +0200815 sdata->dev->name, print_mac(mac, sta->sta.addr));
Johannes Berg24723d12008-09-11 00:01:46 +0200816#endif
817 __sta_info_unlink(&sta);
818 if (sta)
819 list_add(&sta->list, &tmp_list);
820 }
821 spin_unlock_irqrestore(&local->sta_lock, flags);
822
823 list_for_each_entry_safe(sta, tmp, &tmp_list, list)
824 sta_info_destroy(sta);
825}
Johannes Berg17741cd2008-09-11 00:02:02 +0200826
827struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_hw *hw,
828 const u8 *addr)
829{
Johannes Berg4b7679a2008-09-18 18:14:18 +0200830 struct sta_info *sta = sta_info_get(hw_to_local(hw), addr);
Johannes Berg17741cd2008-09-11 00:02:02 +0200831
832 if (!sta)
833 return NULL;
834 return &sta->sta;
835}
836EXPORT_SYMBOL(ieee80211_find_sta);