blob: 594f2318c3d82daf25dfac1cc387ac01500f0dc8 [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 Berg24487982009-04-23 18:52:52 +020022#include "driver-ops.h"
Johannes Berg2c8dccc2008-04-08 15:14:40 -040023#include "rate.h"
Jiri Bencf0706e82007-05-05 11:45:53 -070024#include "sta_info.h"
Jiri Bence9f207f2007-05-05 11:46:38 -070025#include "debugfs_sta.h"
Luis Carlos Coboee385852008-02-23 15:17:11 +010026#include "mesh.h"
Jiri Bencf0706e82007-05-05 11:45:53 -070027
Johannes Bergd0709a62008-02-25 16:27:46 +010028/**
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 *
Johannes Berg03e44972008-02-27 09:56:40 +010035 * 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
Johannes Berg93e5deb2008-04-01 15:21:00 +020040 * 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()!
Johannes Bergd0709a62008-02-25 16:27:46 +010046 *
Luis R. Rodriguez7e189a12009-06-02 18:38:14 -040047 * sta entries are added by mac80211 when you establish a link with a
48 * peer. This means different things for the different type of interfaces
49 * we support. For a regular station this mean we add the AP sta when we
50 * receive an assocation response from the AP. For IBSS this occurs when
51 * we receive a probe response or a beacon from target IBSS network. For
52 * WDS we add the sta for the peer imediately upon device open. When using
53 * AP mode we add stations for each respective station upon request from
54 * userspace through nl80211.
55 *
Johannes Bergd0709a62008-02-25 16:27:46 +010056 * Because there are debugfs entries for each station, and adding those
57 * must be able to sleep, it is also possible to "pin" a station entry,
58 * that means it can be removed from the hash table but not be freed.
Johannes Berg93e5deb2008-04-01 15:21:00 +020059 * See the comment in __sta_info_unlink() for more information, this is
60 * an internal capability only.
Johannes Bergd0709a62008-02-25 16:27:46 +010061 *
62 * In order to remove a STA info structure, the caller needs to first
Johannes Bergdbbea672008-02-26 14:34:06 +010063 * unlink it (sta_info_unlink()) from the list and hash tables and
Johannes Berg3b967662008-04-08 17:56:52 +020064 * then destroy it; sta_info_destroy() will wait for an RCU grace period
65 * to elapse before actually freeing it. Due to the pinning and the
66 * possibility of multiple callers trying to remove the same STA info at
67 * the same time, sta_info_unlink() can clear the STA info pointer it is
68 * passed to indicate that the STA info is owned by somebody else now.
Johannes Bergd0709a62008-02-25 16:27:46 +010069 *
Johannes Bergdbbea672008-02-26 14:34:06 +010070 * If sta_info_unlink() did not clear the pointer then the caller owns
Johannes Bergd0709a62008-02-25 16:27:46 +010071 * the STA info structure now and is responsible of destroying it with
Johannes Berg3b967662008-04-08 17:56:52 +020072 * a call to sta_info_destroy().
Johannes Bergd0709a62008-02-25 16:27:46 +010073 *
74 * In all other cases, there is no concept of ownership on a STA entry,
75 * each structure is owned by the global hash table/list until it is
76 * removed. All users of the structure need to be RCU protected so that
77 * the structure won't be freed before they are done using it.
78 */
Jiri Bencf0706e82007-05-05 11:45:53 -070079
80/* Caller must hold local->sta_lock */
Michael Wube8755e2007-07-27 15:43:23 +020081static int sta_info_hash_del(struct ieee80211_local *local,
82 struct sta_info *sta)
Jiri Bencf0706e82007-05-05 11:45:53 -070083{
84 struct sta_info *s;
85
Johannes Berg17741cd2008-09-11 00:02:02 +020086 s = local->sta_hash[STA_HASH(sta->sta.addr)];
Jiri Bencf0706e82007-05-05 11:45:53 -070087 if (!s)
Michael Wube8755e2007-07-27 15:43:23 +020088 return -ENOENT;
89 if (s == sta) {
Johannes Berg17741cd2008-09-11 00:02:02 +020090 rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)],
Johannes Bergd0709a62008-02-25 16:27:46 +010091 s->hnext);
Michael Wube8755e2007-07-27 15:43:23 +020092 return 0;
Jiri Bencf0706e82007-05-05 11:45:53 -070093 }
94
Michael Wube8755e2007-07-27 15:43:23 +020095 while (s->hnext && s->hnext != sta)
Jiri Bencf0706e82007-05-05 11:45:53 -070096 s = s->hnext;
Michael Wube8755e2007-07-27 15:43:23 +020097 if (s->hnext) {
Johannes Bergd0709a62008-02-25 16:27:46 +010098 rcu_assign_pointer(s->hnext, sta->hnext);
Michael Wube8755e2007-07-27 15:43:23 +020099 return 0;
100 }
Jiri Bencf0706e82007-05-05 11:45:53 -0700101
Michael Wube8755e2007-07-27 15:43:23 +0200102 return -ENOENT;
Jiri Bencf0706e82007-05-05 11:45:53 -0700103}
104
Johannes Bergd0709a62008-02-25 16:27:46 +0100105/* protected by RCU */
Johannes Berg4b7679a2008-09-18 18:14:18 +0200106struct sta_info *sta_info_get(struct ieee80211_local *local, const u8 *addr)
Johannes Berg43ba7e92008-02-21 14:09:30 +0100107{
108 struct sta_info *sta;
109
Johannes Bergd0709a62008-02-25 16:27:46 +0100110 sta = rcu_dereference(local->sta_hash[STA_HASH(addr)]);
Johannes Berg43ba7e92008-02-21 14:09:30 +0100111 while (sta) {
Shaddy Baddah5cf12e82008-11-28 17:08:10 +1100112 if (memcmp(sta->sta.addr, addr, ETH_ALEN) == 0)
Johannes Berg43ba7e92008-02-21 14:09:30 +0100113 break;
Johannes Bergd0709a62008-02-25 16:27:46 +0100114 sta = rcu_dereference(sta->hnext);
Johannes Berg43ba7e92008-02-21 14:09:30 +0100115 }
116 return sta;
117}
118
Luis Carlos Coboee385852008-02-23 15:17:11 +0100119struct sta_info *sta_info_get_by_idx(struct ieee80211_local *local, int idx,
120 struct net_device *dev)
121{
122 struct sta_info *sta;
123 int i = 0;
124
Johannes Bergd0709a62008-02-25 16:27:46 +0100125 list_for_each_entry_rcu(sta, &local->sta_list, list) {
Luis Carlos Cobo2a8ca292008-02-29 17:51:25 -0800126 if (dev && dev != sta->sdata->dev)
127 continue;
Luis Carlos Coboee385852008-02-23 15:17:11 +0100128 if (i < idx) {
129 ++i;
130 continue;
Luis Carlos Coboee385852008-02-23 15:17:11 +0100131 }
Luis Carlos Cobo2a8ca292008-02-29 17:51:25 -0800132 return sta;
Luis Carlos Coboee385852008-02-23 15:17:11 +0100133 }
Luis Carlos Coboee385852008-02-23 15:17:11 +0100134
135 return NULL;
136}
Jiri Bencf0706e82007-05-05 11:45:53 -0700137
Johannes Berg93e5deb2008-04-01 15:21:00 +0200138/**
139 * __sta_info_free - internal STA free helper
140 *
Randy Dunlap6ef307b2008-07-03 13:52:18 -0700141 * @local: pointer to the global information
Johannes Berg93e5deb2008-04-01 15:21:00 +0200142 * @sta: STA info to free
143 *
144 * This function must undo everything done by sta_info_alloc()
145 * that may happen before sta_info_insert().
146 */
147static void __sta_info_free(struct ieee80211_local *local,
148 struct sta_info *sta)
149{
Johannes Berg4b7679a2008-09-18 18:14:18 +0200150 rate_control_free_sta(sta);
Johannes Berg93e5deb2008-04-01 15:21:00 +0200151 rate_control_put(sta->rate_ctrl);
152
153#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
Johannes Berg0c68ae262008-10-27 15:56:10 -0700154 printk(KERN_DEBUG "%s: Destroyed STA %pM\n",
155 wiphy_name(local->hw.wiphy), sta->sta.addr);
Johannes Berg93e5deb2008-04-01 15:21:00 +0200156#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
157
158 kfree(sta);
159}
160
Johannes Bergd0709a62008-02-25 16:27:46 +0100161void sta_info_destroy(struct sta_info *sta)
Jiri Bencf0706e82007-05-05 11:45:53 -0700162{
Johannes Berg97bff8e2008-03-31 19:23:00 +0200163 struct ieee80211_local *local;
Jiri Bencf0706e82007-05-05 11:45:53 -0700164 struct sk_buff *skb;
Ron Rindjunsky07db2182007-12-25 17:00:33 +0200165 int i;
Johannes Berg73651ee2008-02-25 16:27:47 +0100166
Johannes Berg97bff8e2008-03-31 19:23:00 +0200167 might_sleep();
168
Johannes Berg73651ee2008-02-25 16:27:47 +0100169 if (!sta)
170 return;
Jiri Bencf0706e82007-05-05 11:45:53 -0700171
Johannes Berg97bff8e2008-03-31 19:23:00 +0200172 local = sta->local;
Johannes Bergd0709a62008-02-25 16:27:46 +0100173
174 rate_control_remove_sta_debugfs(sta);
175 ieee80211_sta_debugfs_remove(sta);
176
177#ifdef CONFIG_MAC80211_MESH
178 if (ieee80211_vif_is_mesh(&sta->sdata->vif))
179 mesh_plink_deactivate(sta);
180#endif
181
Johannes Berg3b967662008-04-08 17:56:52 +0200182 /*
183 * We have only unlinked the key, and actually destroying it
184 * may mean it is removed from hardware which requires that
185 * the key->sta pointer is still valid, so flush the key todo
186 * list here.
187 *
188 * ieee80211_key_todo() will synchronize_rcu() so after this
189 * nothing can reference this sta struct any more.
190 */
191 ieee80211_key_todo();
Johannes Bergd0709a62008-02-25 16:27:46 +0100192
193#ifdef CONFIG_MAC80211_MESH
194 if (ieee80211_vif_is_mesh(&sta->sdata->vif))
195 del_timer_sync(&sta->plink_timer);
196#endif
197
Jiri Bencf0706e82007-05-05 11:45:53 -0700198 while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
199 local->total_ps_buffered--;
200 dev_kfree_skb_any(skb);
201 }
Johannes Bergd0709a62008-02-25 16:27:46 +0100202
203 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL)
Jiri Bencf0706e82007-05-05 11:45:53 -0700204 dev_kfree_skb_any(skb);
Johannes Bergd0709a62008-02-25 16:27:46 +0100205
Ron Rindjunskyfe3bf0f2008-01-28 14:07:19 +0200206 for (i = 0; i < STA_TID_NUM; i++) {
Johannes Berg55687e32009-02-10 21:25:51 +0100207 struct tid_ampdu_rx *tid_rx;
208 struct tid_ampdu_tx *tid_tx;
209
Johannes Berg07346f812008-05-03 01:02:02 +0200210 spin_lock_bh(&sta->lock);
Johannes Berg55687e32009-02-10 21:25:51 +0100211 tid_rx = sta->ampdu_mlme.tid_rx[i];
212 /* Make sure timer won't free the tid_rx struct, see below */
213 if (tid_rx)
214 tid_rx->shutdown = true;
Johannes Berg96f5e662009-02-12 00:51:53 +0100215
Johannes Berg07346f812008-05-03 01:02:02 +0200216 spin_unlock_bh(&sta->lock);
Johannes Berg55687e32009-02-10 21:25:51 +0100217
218 /*
219 * Outside spinlock - shutdown is true now so that the timer
220 * won't free tid_rx, we have to do that now. Can't let the
221 * timer do it because we have to sync the timer outside the
222 * lock that it takes itself.
223 */
224 if (tid_rx) {
225 del_timer_sync(&tid_rx->session_timer);
226 kfree(tid_rx);
227 }
228
229 /*
230 * No need to do such complications for TX agg sessions, the
231 * path leading to freeing the tid_tx struct goes via a call
232 * from the driver, and thus needs to look up the sta struct
233 * again, which cannot be found when we get here. Hence, we
234 * just need to delete the timer and free the aggregation
235 * info; we won't be telling the peer about it then but that
236 * doesn't matter if we're not talking to it again anyway.
237 */
238 tid_tx = sta->ampdu_mlme.tid_tx[i];
239 if (tid_tx) {
240 del_timer_sync(&tid_tx->addba_resp_timer);
Johannes Bergcd8ffc82009-03-23 17:28:41 +0100241 /*
242 * STA removed while aggregation session being
243 * started? Bit odd, but purge frames anyway.
244 */
245 skb_queue_purge(&tid_tx->pending);
Johannes Berg55687e32009-02-10 21:25:51 +0100246 kfree(tid_tx);
247 }
Ron Rindjunskyfe3bf0f2008-01-28 14:07:19 +0200248 }
Ron Rindjunskycee24a32008-03-26 20:36:03 +0200249
Johannes Berg93e5deb2008-04-01 15:21:00 +0200250 __sta_info_free(local, sta);
Jiri Bencf0706e82007-05-05 11:45:53 -0700251}
252
253
Johannes Bergd0709a62008-02-25 16:27:46 +0100254/* Caller must hold local->sta_lock */
255static void sta_info_hash_add(struct ieee80211_local *local,
256 struct sta_info *sta)
Jiri Bencf0706e82007-05-05 11:45:53 -0700257{
Johannes Berg17741cd2008-09-11 00:02:02 +0200258 sta->hnext = local->sta_hash[STA_HASH(sta->sta.addr)];
259 rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)], sta);
Jiri Bencf0706e82007-05-05 11:45:53 -0700260}
Jiri Bencf0706e82007-05-05 11:45:53 -0700261
Johannes Berg73651ee2008-02-25 16:27:47 +0100262struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
263 u8 *addr, gfp_t gfp)
Jiri Bencf0706e82007-05-05 11:45:53 -0700264{
Johannes Bergd0709a62008-02-25 16:27:46 +0100265 struct ieee80211_local *local = sdata->local;
Jiri Bencf0706e82007-05-05 11:45:53 -0700266 struct sta_info *sta;
Ron Rindjunsky16c5f152007-12-25 17:00:34 +0200267 int i;
Jiri Bencf0706e82007-05-05 11:45:53 -0700268
Johannes Berg17741cd2008-09-11 00:02:02 +0200269 sta = kzalloc(sizeof(*sta) + local->hw.sta_data_size, gfp);
Jiri Bencf0706e82007-05-05 11:45:53 -0700270 if (!sta)
Johannes Berg73651ee2008-02-25 16:27:47 +0100271 return NULL;
Jiri Bencf0706e82007-05-05 11:45:53 -0700272
Johannes Berg07346f812008-05-03 01:02:02 +0200273 spin_lock_init(&sta->lock);
Johannes Berg5a9f7b02008-06-18 14:58:09 +0200274 spin_lock_init(&sta->flaglock);
Johannes Berg07346f812008-05-03 01:02:02 +0200275
Johannes Berg17741cd2008-09-11 00:02:02 +0200276 memcpy(sta->sta.addr, addr, ETH_ALEN);
Johannes Bergd0709a62008-02-25 16:27:46 +0100277 sta->local = local;
278 sta->sdata = sdata;
Jiri Bencf0706e82007-05-05 11:45:53 -0700279
280 sta->rate_ctrl = rate_control_get(local->rate_ctrl);
Johannes Bergd0709a62008-02-25 16:27:46 +0100281 sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl,
Johannes Berg4b7679a2008-09-18 18:14:18 +0200282 &sta->sta, gfp);
Jiri Bencf0706e82007-05-05 11:45:53 -0700283 if (!sta->rate_ctrl_priv) {
284 rate_control_put(sta->rate_ctrl);
Jiri Bencf0706e82007-05-05 11:45:53 -0700285 kfree(sta);
Johannes Berg73651ee2008-02-25 16:27:47 +0100286 return NULL;
Jiri Bencf0706e82007-05-05 11:45:53 -0700287 }
288
Ron Rindjunsky16c5f152007-12-25 17:00:34 +0200289 for (i = 0; i < STA_TID_NUM; i++) {
290 /* timer_to_tid must be initialized with identity mapping to
291 * enable session_timer's data differentiation. refer to
292 * sta_rx_agg_session_timer_expired for useage */
293 sta->timer_to_tid[i] = i;
Ron Rindjunskycee24a32008-03-26 20:36:03 +0200294 /* rx */
295 sta->ampdu_mlme.tid_state_rx[i] = HT_AGG_STATE_IDLE;
296 sta->ampdu_mlme.tid_rx[i] = NULL;
297 /* tx */
298 sta->ampdu_mlme.tid_state_tx[i] = HT_AGG_STATE_IDLE;
299 sta->ampdu_mlme.tid_tx[i] = NULL;
300 sta->ampdu_mlme.addba_req_num[i] = 0;
Ron Rindjunsky16c5f152007-12-25 17:00:34 +0200301 }
Jiri Bencf0706e82007-05-05 11:45:53 -0700302 skb_queue_head_init(&sta->ps_tx_buf);
303 skb_queue_head_init(&sta->tx_filtered);
Johannes Berg73651ee2008-02-25 16:27:47 +0100304
Senthil Balasubramaniancccaec92009-05-14 18:42:08 +0530305 for (i = 0; i < NUM_RX_DATA_QUEUES; i++)
306 sta->last_seq_ctrl[i] = cpu_to_le16(USHORT_MAX);
307
Johannes Berg73651ee2008-02-25 16:27:47 +0100308#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
Johannes Berg0c68ae262008-10-27 15:56:10 -0700309 printk(KERN_DEBUG "%s: Allocated STA %pM\n",
310 wiphy_name(local->hw.wiphy), sta->sta.addr);
Johannes Berg73651ee2008-02-25 16:27:47 +0100311#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
312
Johannes Berg03e44972008-02-27 09:56:40 +0100313#ifdef CONFIG_MAC80211_MESH
Luis Carlos Cobob4e08ea2008-02-29 15:46:08 -0800314 sta->plink_state = PLINK_LISTEN;
Johannes Berg03e44972008-02-27 09:56:40 +0100315 init_timer(&sta->plink_timer);
316#endif
317
Johannes Berg73651ee2008-02-25 16:27:47 +0100318 return sta;
319}
320
321int sta_info_insert(struct sta_info *sta)
322{
323 struct ieee80211_local *local = sta->local;
324 struct ieee80211_sub_if_data *sdata = sta->sdata;
325 unsigned long flags;
Johannes Berg93e5deb2008-04-01 15:21:00 +0200326 int err = 0;
Johannes Berg73651ee2008-02-25 16:27:47 +0100327
Johannes Berg03e44972008-02-27 09:56:40 +0100328 /*
329 * Can't be a WARN_ON because it can be triggered through a race:
330 * something inserts a STA (on one CPU) without holding the RTNL
331 * and another CPU turns off the net device.
332 */
Johannes Berg93e5deb2008-04-01 15:21:00 +0200333 if (unlikely(!netif_running(sdata->dev))) {
334 err = -ENETDOWN;
335 goto out_free;
336 }
Johannes Berg03e44972008-02-27 09:56:40 +0100337
Johannes Berg17741cd2008-09-11 00:02:02 +0200338 if (WARN_ON(compare_ether_addr(sta->sta.addr, sdata->dev->dev_addr) == 0 ||
Johannes Bergc6a1fa12008-10-07 12:04:32 +0200339 is_multicast_ether_addr(sta->sta.addr))) {
Johannes Berg93e5deb2008-04-01 15:21:00 +0200340 err = -EINVAL;
341 goto out_free;
342 }
Johannes Berg44213b52008-02-25 16:27:49 +0100343
Johannes Bergd0709a62008-02-25 16:27:46 +0100344 spin_lock_irqsave(&local->sta_lock, flags);
Johannes Berg43ba7e92008-02-21 14:09:30 +0100345 /* check if STA exists already */
Johannes Berg4b7679a2008-09-18 18:14:18 +0200346 if (sta_info_get(local, sta->sta.addr)) {
Johannes Bergd0709a62008-02-25 16:27:46 +0100347 spin_unlock_irqrestore(&local->sta_lock, flags);
Johannes Berg93e5deb2008-04-01 15:21:00 +0200348 err = -EEXIST;
349 goto out_free;
Johannes Berg43ba7e92008-02-21 14:09:30 +0100350 }
Jiri Bencf0706e82007-05-05 11:45:53 -0700351 list_add(&sta->list, &local->sta_list);
Johannes Bergf5ea9122009-08-07 16:17:38 +0200352 local->sta_generation++;
Jiri Bencf0706e82007-05-05 11:45:53 -0700353 local->num_sta++;
354 sta_info_hash_add(local, sta);
Johannes Berg32bfd352007-12-19 01:31:26 +0100355
Johannes Bergd0709a62008-02-25 16:27:46 +0100356 /* notify driver */
357 if (local->ops->sta_notify) {
Johannes Berg05c914f2008-09-11 00:01:58 +0200358 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
Johannes Berg3e122be2008-07-09 14:40:34 +0200359 sdata = container_of(sdata->bss,
360 struct ieee80211_sub_if_data,
361 u.ap);
Johannes Berg32bfd352007-12-19 01:31:26 +0100362
Johannes Berg24487982009-04-23 18:52:52 +0200363 drv_sta_notify(local, &sdata->vif, STA_NOTIFY_ADD, &sta->sta);
Johannes Bergfbc44bf2009-10-01 22:06:29 +0200364 sdata = sta->sdata;
Johannes Berg32bfd352007-12-19 01:31:26 +0100365 }
Johannes Bergd0709a62008-02-25 16:27:46 +0100366
Jiri Bencf0706e82007-05-05 11:45:53 -0700367#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
Johannes Berg0c68ae262008-10-27 15:56:10 -0700368 printk(KERN_DEBUG "%s: Inserted STA %pM\n",
369 wiphy_name(local->hw.wiphy), sta->sta.addr);
Jiri Bencf0706e82007-05-05 11:45:53 -0700370#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
371
Johannes Berg73651ee2008-02-25 16:27:47 +0100372 spin_unlock_irqrestore(&local->sta_lock, flags);
373
Jiri Bence9f207f2007-05-05 11:46:38 -0700374#ifdef CONFIG_MAC80211_DEBUGFS
Johannes Berg93e5deb2008-04-01 15:21:00 +0200375 /*
376 * Debugfs entry adding might sleep, so schedule process
Michael Wube8755e2007-07-27 15:43:23 +0200377 * context task for adding entry for STAs that do not yet
Johannes Berg93e5deb2008-04-01 15:21:00 +0200378 * have one.
379 * NOTE: due to auto-freeing semantics this may only be done
380 * if the insertion is successful!
381 */
Johannes Berg49ec6fa22008-04-03 14:31:05 +0200382 schedule_work(&local->sta_debugfs_add);
Jiri Bence9f207f2007-05-05 11:46:38 -0700383#endif
384
Johannes Berg73651ee2008-02-25 16:27:47 +0100385 if (ieee80211_vif_is_mesh(&sdata->vif))
386 mesh_accept_plinks_update(sdata);
387
388 return 0;
Johannes Berg93e5deb2008-04-01 15:21:00 +0200389 out_free:
390 BUG_ON(!err);
391 __sta_info_free(local, sta);
392 return err;
Jiri Bencf0706e82007-05-05 11:45:53 -0700393}
394
Johannes Berg004c8722008-02-20 11:21:35 +0100395static inline void __bss_tim_set(struct ieee80211_if_ap *bss, u16 aid)
396{
397 /*
398 * This format has been mandated by the IEEE specifications,
399 * so this line may not be changed to use the __set_bit() format.
400 */
401 bss->tim[aid / 8] |= (1 << (aid % 8));
402}
403
404static inline void __bss_tim_clear(struct ieee80211_if_ap *bss, u16 aid)
405{
406 /*
407 * This format has been mandated by the IEEE specifications,
408 * so this line may not be changed to use the __clear_bit() format.
409 */
410 bss->tim[aid / 8] &= ~(1 << (aid % 8));
411}
412
413static void __sta_info_set_tim_bit(struct ieee80211_if_ap *bss,
414 struct sta_info *sta)
415{
Johannes Berg3e122be2008-07-09 14:40:34 +0200416 BUG_ON(!bss);
417
Johannes Berg17741cd2008-09-11 00:02:02 +0200418 __bss_tim_set(bss, sta->sta.aid);
Johannes Berg3e122be2008-07-09 14:40:34 +0200419
Johannes Bergd0709a62008-02-25 16:27:46 +0100420 if (sta->local->ops->set_tim) {
421 sta->local->tim_in_locked_section = true;
Johannes Berg24487982009-04-23 18:52:52 +0200422 drv_set_tim(sta->local, &sta->sta, true);
Johannes Bergd0709a62008-02-25 16:27:46 +0100423 sta->local->tim_in_locked_section = false;
424 }
Johannes Berg004c8722008-02-20 11:21:35 +0100425}
426
427void sta_info_set_tim_bit(struct sta_info *sta)
428{
Johannes Bergd0709a62008-02-25 16:27:46 +0100429 unsigned long flags;
Johannes Berg004c8722008-02-20 11:21:35 +0100430
Johannes Berg3e122be2008-07-09 14:40:34 +0200431 BUG_ON(!sta->sdata->bss);
432
Johannes Bergd0709a62008-02-25 16:27:46 +0100433 spin_lock_irqsave(&sta->local->sta_lock, flags);
434 __sta_info_set_tim_bit(sta->sdata->bss, sta);
435 spin_unlock_irqrestore(&sta->local->sta_lock, flags);
Johannes Berg004c8722008-02-20 11:21:35 +0100436}
437
438static void __sta_info_clear_tim_bit(struct ieee80211_if_ap *bss,
439 struct sta_info *sta)
440{
Johannes Berg3e122be2008-07-09 14:40:34 +0200441 BUG_ON(!bss);
442
Johannes Berg17741cd2008-09-11 00:02:02 +0200443 __bss_tim_clear(bss, sta->sta.aid);
Johannes Berg3e122be2008-07-09 14:40:34 +0200444
Johannes Bergd0709a62008-02-25 16:27:46 +0100445 if (sta->local->ops->set_tim) {
446 sta->local->tim_in_locked_section = true;
Johannes Berg24487982009-04-23 18:52:52 +0200447 drv_set_tim(sta->local, &sta->sta, false);
Johannes Bergd0709a62008-02-25 16:27:46 +0100448 sta->local->tim_in_locked_section = false;
449 }
Johannes Berg004c8722008-02-20 11:21:35 +0100450}
451
452void sta_info_clear_tim_bit(struct sta_info *sta)
453{
Johannes Bergd0709a62008-02-25 16:27:46 +0100454 unsigned long flags;
Johannes Berg004c8722008-02-20 11:21:35 +0100455
Johannes Berg3e122be2008-07-09 14:40:34 +0200456 BUG_ON(!sta->sdata->bss);
457
Johannes Bergd0709a62008-02-25 16:27:46 +0100458 spin_lock_irqsave(&sta->local->sta_lock, flags);
459 __sta_info_clear_tim_bit(sta->sdata->bss, sta);
460 spin_unlock_irqrestore(&sta->local->sta_lock, flags);
Johannes Berg004c8722008-02-20 11:21:35 +0100461}
462
Johannes Berg24723d12008-09-11 00:01:46 +0200463static void __sta_info_unlink(struct sta_info **sta)
Johannes Bergd0709a62008-02-25 16:27:46 +0100464{
465 struct ieee80211_local *local = (*sta)->local;
466 struct ieee80211_sub_if_data *sdata = (*sta)->sdata;
Johannes Bergd0709a62008-02-25 16:27:46 +0100467 /*
468 * pull caller's reference if we're already gone.
469 */
470 if (sta_info_hash_del(local, *sta)) {
471 *sta = NULL;
Michael Wube8755e2007-07-27 15:43:23 +0200472 return;
Johannes Bergd0709a62008-02-25 16:27:46 +0100473 }
Michael Wube8755e2007-07-27 15:43:23 +0200474
Johannes Berg3b967662008-04-08 17:56:52 +0200475 if ((*sta)->key) {
476 ieee80211_key_free((*sta)->key);
477 WARN_ON((*sta)->key);
478 }
479
Johannes Berg7d1559f2008-04-08 13:08:20 +0200480 list_del(&(*sta)->list);
481
Johannes Berg07346f812008-05-03 01:02:02 +0200482 if (test_and_clear_sta_flags(*sta, WLAN_STA_PS)) {
Johannes Berg3e122be2008-07-09 14:40:34 +0200483 BUG_ON(!sdata->bss);
484
485 atomic_dec(&sdata->bss->num_sta_ps);
Johannes Berg7d1559f2008-04-08 13:08:20 +0200486 __sta_info_clear_tim_bit(sdata->bss, *sta);
487 }
488
489 local->num_sta--;
Johannes Bergf5ea9122009-08-07 16:17:38 +0200490 local->sta_generation++;
Johannes Berg7d1559f2008-04-08 13:08:20 +0200491
492 if (local->ops->sta_notify) {
Johannes Berg05c914f2008-09-11 00:01:58 +0200493 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
Johannes Berg3e122be2008-07-09 14:40:34 +0200494 sdata = container_of(sdata->bss,
495 struct ieee80211_sub_if_data,
496 u.ap);
Johannes Berg7d1559f2008-04-08 13:08:20 +0200497
Johannes Berg24487982009-04-23 18:52:52 +0200498 drv_sta_notify(local, &sdata->vif, STA_NOTIFY_REMOVE,
499 &(*sta)->sta);
Johannes Bergfbc44bf2009-10-01 22:06:29 +0200500 sdata = (*sta)->sdata;
Johannes Berg7d1559f2008-04-08 13:08:20 +0200501 }
502
503 if (ieee80211_vif_is_mesh(&sdata->vif)) {
504 mesh_accept_plinks_update(sdata);
505#ifdef CONFIG_MAC80211_MESH
506 del_timer(&(*sta)->plink_timer);
507#endif
508 }
509
510#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
Johannes Berg0c68ae262008-10-27 15:56:10 -0700511 printk(KERN_DEBUG "%s: Removed STA %pM\n",
512 wiphy_name(local->hw.wiphy), (*sta)->sta.addr);
Johannes Berg7d1559f2008-04-08 13:08:20 +0200513#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
514
Johannes Bergd0709a62008-02-25 16:27:46 +0100515 /*
Johannes Berg7d1559f2008-04-08 13:08:20 +0200516 * Finally, pull caller's reference if the STA is pinned by the
Johannes Bergd0709a62008-02-25 16:27:46 +0100517 * task that is adding the debugfs entries. In that case, we
518 * leave the STA "to be freed".
519 *
520 * The rules are not trivial, but not too complex either:
521 * (1) pin_status is only modified under the sta_lock
Johannes Berg49ec6fa22008-04-03 14:31:05 +0200522 * (2) STAs may only be pinned under the RTNL so that
523 * sta_info_flush() is guaranteed to actually destroy
524 * all STAs that are active for a given interface, this
525 * is required for correctness because otherwise we
526 * could notify a driver that an interface is going
527 * away and only after that (!) notify it about a STA
528 * on that interface going away.
529 * (3) sta_info_debugfs_add_work() will set the status
Johannes Bergd0709a62008-02-25 16:27:46 +0100530 * to PINNED when it found an item that needs a new
531 * debugfs directory created. In that case, that item
532 * must not be freed although all *RCU* users are done
533 * with it. Hence, we tell the caller of _unlink()
534 * that the item is already gone (as can happen when
535 * two tasks try to unlink/destroy at the same time)
Johannes Berg49ec6fa22008-04-03 14:31:05 +0200536 * (4) We set the pin_status to DESTROY here when we
Johannes Bergd0709a62008-02-25 16:27:46 +0100537 * find such an item.
Johannes Berg49ec6fa22008-04-03 14:31:05 +0200538 * (5) sta_info_debugfs_add_work() will reset the pin_status
Johannes Bergd0709a62008-02-25 16:27:46 +0100539 * from PINNED to NORMAL when it is done with the item,
540 * but will check for DESTROY before resetting it in
541 * which case it will free the item.
542 */
543 if ((*sta)->pin_status == STA_INFO_PIN_STAT_PINNED) {
544 (*sta)->pin_status = STA_INFO_PIN_STAT_DESTROY;
545 *sta = NULL;
546 return;
547 }
Jiri Bencf0706e82007-05-05 11:45:53 -0700548}
549
Johannes Bergd0709a62008-02-25 16:27:46 +0100550void sta_info_unlink(struct sta_info **sta)
551{
552 struct ieee80211_local *local = (*sta)->local;
553 unsigned long flags;
554
555 spin_lock_irqsave(&local->sta_lock, flags);
556 __sta_info_unlink(sta);
557 spin_unlock_irqrestore(&local->sta_lock, flags);
558}
Jiri Bencf0706e82007-05-05 11:45:53 -0700559
Johannes Berg57c4d7b2009-04-23 16:10:04 +0200560static int sta_info_buffer_expired(struct sta_info *sta,
561 struct sk_buff *skb)
Jiri Bencf0706e82007-05-05 11:45:53 -0700562{
Johannes Berge039fa42008-05-15 12:55:29 +0200563 struct ieee80211_tx_info *info;
Jiri Bencf0706e82007-05-05 11:45:53 -0700564 int timeout;
565
566 if (!skb)
567 return 0;
568
Johannes Berge039fa42008-05-15 12:55:29 +0200569 info = IEEE80211_SKB_CB(skb);
Jiri Bencf0706e82007-05-05 11:45:53 -0700570
571 /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
Johannes Berg57c4d7b2009-04-23 16:10:04 +0200572 timeout = (sta->listen_interval *
573 sta->sdata->vif.bss_conf.beacon_int *
574 32 / 15625) * HZ;
Jiri Bencf0706e82007-05-05 11:45:53 -0700575 if (timeout < STA_TX_BUFFER_EXPIRE)
576 timeout = STA_TX_BUFFER_EXPIRE;
Johannes Berge039fa42008-05-15 12:55:29 +0200577 return time_after(jiffies, info->control.jiffies + timeout);
Jiri Bencf0706e82007-05-05 11:45:53 -0700578}
579
580
581static void sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
582 struct sta_info *sta)
583{
584 unsigned long flags;
585 struct sk_buff *skb;
Johannes Berg836341a2008-02-20 02:07:21 +0100586 struct ieee80211_sub_if_data *sdata;
Jiri Bencf0706e82007-05-05 11:45:53 -0700587
588 if (skb_queue_empty(&sta->ps_tx_buf))
589 return;
590
591 for (;;) {
592 spin_lock_irqsave(&sta->ps_tx_buf.lock, flags);
593 skb = skb_peek(&sta->ps_tx_buf);
Johannes Berg57c4d7b2009-04-23 16:10:04 +0200594 if (sta_info_buffer_expired(sta, skb))
Jiri Bencf0706e82007-05-05 11:45:53 -0700595 skb = __skb_dequeue(&sta->ps_tx_buf);
Johannes Berg836341a2008-02-20 02:07:21 +0100596 else
Jiri Bencf0706e82007-05-05 11:45:53 -0700597 skb = NULL;
598 spin_unlock_irqrestore(&sta->ps_tx_buf.lock, flags);
599
Johannes Berg836341a2008-02-20 02:07:21 +0100600 if (!skb)
Jiri Bencf0706e82007-05-05 11:45:53 -0700601 break;
Johannes Berg836341a2008-02-20 02:07:21 +0100602
Johannes Bergd0709a62008-02-25 16:27:46 +0100603 sdata = sta->sdata;
Johannes Berg836341a2008-02-20 02:07:21 +0100604 local->total_ps_buffered--;
Johannes Bergf4ea83d2008-06-30 15:10:46 +0200605#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Johannes Berg0c68ae262008-10-27 15:56:10 -0700606 printk(KERN_DEBUG "Buffered frame expired (STA %pM)\n",
607 sta->sta.addr);
Johannes Bergf4ea83d2008-06-30 15:10:46 +0200608#endif
Johannes Berg836341a2008-02-20 02:07:21 +0100609 dev_kfree_skb(skb);
610
Johannes Berg004c8722008-02-20 11:21:35 +0100611 if (skb_queue_empty(&sta->ps_tx_buf))
612 sta_info_clear_tim_bit(sta);
Jiri Bencf0706e82007-05-05 11:45:53 -0700613 }
614}
615
616
617static void sta_info_cleanup(unsigned long data)
618{
619 struct ieee80211_local *local = (struct ieee80211_local *) data;
620 struct sta_info *sta;
621
Johannes Bergd0709a62008-02-25 16:27:46 +0100622 rcu_read_lock();
623 list_for_each_entry_rcu(sta, &local->sta_list, list)
Jiri Bencf0706e82007-05-05 11:45:53 -0700624 sta_info_cleanup_expire_buffered(local, sta);
Johannes Bergd0709a62008-02-25 16:27:46 +0100625 rcu_read_unlock();
Jiri Bencf0706e82007-05-05 11:45:53 -0700626
Johannes Berg5bb644a2009-05-17 11:40:42 +0200627 if (local->quiescing)
628 return;
629
Johannes Berg0d174402007-12-17 15:07:43 +0100630 local->sta_cleanup.expires =
631 round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL);
Jiri Bencf0706e82007-05-05 11:45:53 -0700632 add_timer(&local->sta_cleanup);
633}
634
Jiri Bence9f207f2007-05-05 11:46:38 -0700635#ifdef CONFIG_MAC80211_DEBUGFS
Jiri Slaby4d6141c2008-04-07 21:53:49 +0200636/*
637 * See comment in __sta_info_unlink,
638 * caller must hold local->sta_lock.
639 */
640static void __sta_info_pin(struct sta_info *sta)
641{
642 WARN_ON(sta->pin_status != STA_INFO_PIN_STAT_NORMAL);
643 sta->pin_status = STA_INFO_PIN_STAT_PINNED;
644}
645
646/*
647 * See comment in __sta_info_unlink, returns sta if it
648 * needs to be destroyed.
649 */
650static struct sta_info *__sta_info_unpin(struct sta_info *sta)
651{
652 struct sta_info *ret = NULL;
653 unsigned long flags;
654
655 spin_lock_irqsave(&sta->local->sta_lock, flags);
656 WARN_ON(sta->pin_status != STA_INFO_PIN_STAT_DESTROY &&
657 sta->pin_status != STA_INFO_PIN_STAT_PINNED);
658 if (sta->pin_status == STA_INFO_PIN_STAT_DESTROY)
659 ret = sta;
660 sta->pin_status = STA_INFO_PIN_STAT_NORMAL;
661 spin_unlock_irqrestore(&sta->local->sta_lock, flags);
662
663 return ret;
664}
665
Johannes Bergd0709a62008-02-25 16:27:46 +0100666static void sta_info_debugfs_add_work(struct work_struct *work)
Jiri Bence9f207f2007-05-05 11:46:38 -0700667{
668 struct ieee80211_local *local =
669 container_of(work, struct ieee80211_local, sta_debugfs_add);
670 struct sta_info *sta, *tmp;
Johannes Bergd0709a62008-02-25 16:27:46 +0100671 unsigned long flags;
Jiri Bence9f207f2007-05-05 11:46:38 -0700672
Johannes Berg49ec6fa22008-04-03 14:31:05 +0200673 /* We need to keep the RTNL across the whole pinned status. */
674 rtnl_lock();
Jiri Bence9f207f2007-05-05 11:46:38 -0700675 while (1) {
Jiri Bence9f207f2007-05-05 11:46:38 -0700676 sta = NULL;
Johannes Bergd0709a62008-02-25 16:27:46 +0100677
678 spin_lock_irqsave(&local->sta_lock, flags);
Jiri Bence9f207f2007-05-05 11:46:38 -0700679 list_for_each_entry(tmp, &local->sta_list, list) {
Johannes Berg63044e92008-10-07 12:04:29 +0200680 /*
681 * debugfs.add_has_run will be set by
682 * ieee80211_sta_debugfs_add regardless
683 * of what else it does.
684 */
685 if (!tmp->debugfs.add_has_run) {
Jiri Bence9f207f2007-05-05 11:46:38 -0700686 sta = tmp;
Johannes Bergd0709a62008-02-25 16:27:46 +0100687 __sta_info_pin(sta);
Jiri Bence9f207f2007-05-05 11:46:38 -0700688 break;
689 }
690 }
Johannes Bergd0709a62008-02-25 16:27:46 +0100691 spin_unlock_irqrestore(&local->sta_lock, flags);
Jiri Bence9f207f2007-05-05 11:46:38 -0700692
693 if (!sta)
694 break;
695
Jiri Bence9f207f2007-05-05 11:46:38 -0700696 ieee80211_sta_debugfs_add(sta);
697 rate_control_add_sta_debugfs(sta);
Johannes Bergd0709a62008-02-25 16:27:46 +0100698
699 sta = __sta_info_unpin(sta);
Johannes Berg4f6fab42008-03-31 19:23:02 +0200700 sta_info_destroy(sta);
Jiri Bence9f207f2007-05-05 11:46:38 -0700701 }
Johannes Berg49ec6fa22008-04-03 14:31:05 +0200702 rtnl_unlock();
Jiri Bence9f207f2007-05-05 11:46:38 -0700703}
704#endif
705
Jiri Bencf0706e82007-05-05 11:45:53 -0700706void sta_info_init(struct ieee80211_local *local)
707{
Johannes Bergd0709a62008-02-25 16:27:46 +0100708 spin_lock_init(&local->sta_lock);
Jiri Bencf0706e82007-05-05 11:45:53 -0700709 INIT_LIST_HEAD(&local->sta_list);
Jiri Bencf0706e82007-05-05 11:45:53 -0700710
Pavel Emelyanovb24b8a22008-01-23 21:20:07 -0800711 setup_timer(&local->sta_cleanup, sta_info_cleanup,
712 (unsigned long)local);
Johannes Berg0d174402007-12-17 15:07:43 +0100713 local->sta_cleanup.expires =
714 round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL);
Jiri Bence9f207f2007-05-05 11:46:38 -0700715
716#ifdef CONFIG_MAC80211_DEBUGFS
Johannes Bergd0709a62008-02-25 16:27:46 +0100717 INIT_WORK(&local->sta_debugfs_add, sta_info_debugfs_add_work);
Jiri Bence9f207f2007-05-05 11:46:38 -0700718#endif
Jiri Bencf0706e82007-05-05 11:45:53 -0700719}
720
721int sta_info_start(struct ieee80211_local *local)
722{
723 add_timer(&local->sta_cleanup);
724 return 0;
725}
726
727void sta_info_stop(struct ieee80211_local *local)
728{
Jiri Bencf0706e82007-05-05 11:45:53 -0700729 del_timer(&local->sta_cleanup);
Johannes Berg49ec6fa22008-04-03 14:31:05 +0200730#ifdef CONFIG_MAC80211_DEBUGFS
731 /*
732 * Make sure the debugfs adding work isn't pending after this
733 * because we're about to be destroyed. It doesn't matter
734 * whether it ran or not since we're going to flush all STAs
735 * anyway.
736 */
737 cancel_work_sync(&local->sta_debugfs_add);
738#endif
Johannes Bergdc6676b2008-03-31 19:23:03 +0200739
Michael Wube8755e2007-07-27 15:43:23 +0200740 sta_info_flush(local, NULL);
Jiri Bencf0706e82007-05-05 11:45:53 -0700741}
742
Jiri Bencf0706e82007-05-05 11:45:53 -0700743/**
744 * sta_info_flush - flush matching STA entries from the STA table
Johannes Berg44213b52008-02-25 16:27:49 +0100745 *
746 * Returns the number of removed STA entries.
747 *
Jiri Bencf0706e82007-05-05 11:45:53 -0700748 * @local: local interface data
Johannes Bergd0709a62008-02-25 16:27:46 +0100749 * @sdata: matching rule for the net device (sta->dev) or %NULL to match all STAs
Jiri Bencf0706e82007-05-05 11:45:53 -0700750 */
Johannes Berg44213b52008-02-25 16:27:49 +0100751int sta_info_flush(struct ieee80211_local *local,
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200752 struct ieee80211_sub_if_data *sdata)
Jiri Bencf0706e82007-05-05 11:45:53 -0700753{
754 struct sta_info *sta, *tmp;
Michael Wube8755e2007-07-27 15:43:23 +0200755 LIST_HEAD(tmp_list);
Johannes Berg44213b52008-02-25 16:27:49 +0100756 int ret = 0;
Johannes Bergd0709a62008-02-25 16:27:46 +0100757 unsigned long flags;
Jiri Bencf0706e82007-05-05 11:45:53 -0700758
Johannes Bergd0709a62008-02-25 16:27:46 +0100759 might_sleep();
760
761 spin_lock_irqsave(&local->sta_lock, flags);
762 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
763 if (!sdata || sdata == sta->sdata) {
764 __sta_info_unlink(&sta);
Johannes Berg44213b52008-02-25 16:27:49 +0100765 if (sta) {
Johannes Bergd0709a62008-02-25 16:27:46 +0100766 list_add_tail(&sta->list, &tmp_list);
Johannes Berg44213b52008-02-25 16:27:49 +0100767 ret++;
768 }
Michael Wube8755e2007-07-27 15:43:23 +0200769 }
Michael Wube8755e2007-07-27 15:43:23 +0200770 }
Johannes Bergd0709a62008-02-25 16:27:46 +0100771 spin_unlock_irqrestore(&local->sta_lock, flags);
772
Johannes Bergd0709a62008-02-25 16:27:46 +0100773 list_for_each_entry_safe(sta, tmp, &tmp_list, list)
774 sta_info_destroy(sta);
Johannes Berg44213b52008-02-25 16:27:49 +0100775
776 return ret;
Jiri Bencf0706e82007-05-05 11:45:53 -0700777}
Johannes Bergdc6676b2008-03-31 19:23:03 +0200778
Johannes Berg24723d12008-09-11 00:01:46 +0200779void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
780 unsigned long exp_time)
781{
782 struct ieee80211_local *local = sdata->local;
783 struct sta_info *sta, *tmp;
784 LIST_HEAD(tmp_list);
Johannes Berg24723d12008-09-11 00:01:46 +0200785 unsigned long flags;
786
787 spin_lock_irqsave(&local->sta_lock, flags);
788 list_for_each_entry_safe(sta, tmp, &local->sta_list, list)
789 if (time_after(jiffies, sta->last_rx + exp_time)) {
790#ifdef CONFIG_MAC80211_IBSS_DEBUG
Johannes Berg0c68ae262008-10-27 15:56:10 -0700791 printk(KERN_DEBUG "%s: expiring inactive STA %pM\n",
792 sdata->dev->name, sta->sta.addr);
Johannes Berg24723d12008-09-11 00:01:46 +0200793#endif
794 __sta_info_unlink(&sta);
795 if (sta)
796 list_add(&sta->list, &tmp_list);
797 }
798 spin_unlock_irqrestore(&local->sta_lock, flags);
799
800 list_for_each_entry_safe(sta, tmp, &tmp_list, list)
801 sta_info_destroy(sta);
802}
Johannes Berg17741cd2008-09-11 00:02:02 +0200803
804struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_hw *hw,
Johannes Bergc6a1fa12008-10-07 12:04:32 +0200805 const u8 *addr)
Johannes Berg17741cd2008-09-11 00:02:02 +0200806{
Johannes Berg4b7679a2008-09-18 18:14:18 +0200807 struct sta_info *sta = sta_info_get(hw_to_local(hw), addr);
Johannes Berg17741cd2008-09-11 00:02:02 +0200808
809 if (!sta)
810 return NULL;
811 return &sta->sta;
812}
813EXPORT_SYMBOL(ieee80211_find_sta);