blob: c426504ed1cfeecddefb3589871668c02448326e [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 Berg34e89502010-02-03 13:59:58 +010035 * Upon allocating a STA info structure with sta_info_alloc(), the caller
36 * owns that structure. It must then insert it into the hash table using
37 * either sta_info_insert() or sta_info_insert_rcu(); only in the latter
38 * case (which acquires an rcu read section but must not be called from
39 * within one) will the pointer still be valid after the call. Note that
40 * the caller may not do much with the STA info before inserting it, in
41 * particular, it may not start any mesh peer link management or add
42 * encryption keys.
Johannes Berg93e5deb2008-04-01 15:21:00 +020043 *
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 *
Johannes Berg34e89502010-02-03 13:59:58 +010047 * Station entries are added by mac80211 when you establish a link with a
Luis R. Rodriguez7e189a12009-06-02 18:38:14 -040048 * 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
Johannes Berg34e89502010-02-03 13:59:58 +010051 * get to know about a peer on the same IBSS. For WDS we add the sta for
52 * the peer imediately upon device open. When using AP mode we add stations
53 * for each respective station upon request from userspace through nl80211.
Luis R. Rodriguez7e189a12009-06-02 18:38:14 -040054 *
Johannes Berg34e89502010-02-03 13:59:58 +010055 * In order to remove a STA info structure, various sta_info_destroy_*()
56 * calls are available.
Johannes Bergd0709a62008-02-25 16:27:46 +010057 *
Johannes Berg34e89502010-02-03 13:59:58 +010058 * There is no concept of ownership on a STA entry, each structure is
59 * owned by the global hash table/list until it is removed. All users of
60 * the structure need to be RCU protected so that the structure won't be
61 * freed before they are done using it.
Johannes Bergd0709a62008-02-25 16:27:46 +010062 */
Jiri Bencf0706e82007-05-05 11:45:53 -070063
64/* Caller must hold local->sta_lock */
Michael Wube8755e2007-07-27 15:43:23 +020065static int sta_info_hash_del(struct ieee80211_local *local,
66 struct sta_info *sta)
Jiri Bencf0706e82007-05-05 11:45:53 -070067{
68 struct sta_info *s;
69
Johannes Berg17741cd2008-09-11 00:02:02 +020070 s = local->sta_hash[STA_HASH(sta->sta.addr)];
Jiri Bencf0706e82007-05-05 11:45:53 -070071 if (!s)
Michael Wube8755e2007-07-27 15:43:23 +020072 return -ENOENT;
73 if (s == sta) {
Johannes Berg17741cd2008-09-11 00:02:02 +020074 rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)],
Johannes Bergd0709a62008-02-25 16:27:46 +010075 s->hnext);
Michael Wube8755e2007-07-27 15:43:23 +020076 return 0;
Jiri Bencf0706e82007-05-05 11:45:53 -070077 }
78
Michael Wube8755e2007-07-27 15:43:23 +020079 while (s->hnext && s->hnext != sta)
Jiri Bencf0706e82007-05-05 11:45:53 -070080 s = s->hnext;
Michael Wube8755e2007-07-27 15:43:23 +020081 if (s->hnext) {
Johannes Bergd0709a62008-02-25 16:27:46 +010082 rcu_assign_pointer(s->hnext, sta->hnext);
Michael Wube8755e2007-07-27 15:43:23 +020083 return 0;
84 }
Jiri Bencf0706e82007-05-05 11:45:53 -070085
Michael Wube8755e2007-07-27 15:43:23 +020086 return -ENOENT;
Jiri Bencf0706e82007-05-05 11:45:53 -070087}
88
Johannes Bergd0709a62008-02-25 16:27:46 +010089/* protected by RCU */
Johannes Bergabe60632009-11-25 17:46:18 +010090struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata,
91 const u8 *addr)
Johannes Berg43ba7e92008-02-21 14:09:30 +010092{
Johannes Bergabe60632009-11-25 17:46:18 +010093 struct ieee80211_local *local = sdata->local;
Johannes Berg43ba7e92008-02-21 14:09:30 +010094 struct sta_info *sta;
95
Johannes Berg03791852010-04-06 11:18:42 +020096 sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)],
97 rcu_read_lock_held() ||
98 lockdep_is_held(&local->sta_lock) ||
99 lockdep_is_held(&local->sta_mtx));
Johannes Berg43ba7e92008-02-21 14:09:30 +0100100 while (sta) {
Johannes Bergabe60632009-11-25 17:46:18 +0100101 if (sta->sdata == sdata &&
102 memcmp(sta->sta.addr, addr, ETH_ALEN) == 0)
Johannes Berg43ba7e92008-02-21 14:09:30 +0100103 break;
Johannes Berg03791852010-04-06 11:18:42 +0200104 sta = rcu_dereference_check(sta->hnext,
105 rcu_read_lock_held() ||
106 lockdep_is_held(&local->sta_lock) ||
107 lockdep_is_held(&local->sta_mtx));
Johannes Berg43ba7e92008-02-21 14:09:30 +0100108 }
109 return sta;
110}
111
Felix Fietkau0e5ded52010-01-08 18:10:58 +0100112/*
113 * Get sta info either from the specified interface
114 * or from one of its vlans
115 */
116struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata,
117 const u8 *addr)
118{
119 struct ieee80211_local *local = sdata->local;
120 struct sta_info *sta;
121
Johannes Berg03791852010-04-06 11:18:42 +0200122 sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)],
123 rcu_read_lock_held() ||
124 lockdep_is_held(&local->sta_lock) ||
125 lockdep_is_held(&local->sta_mtx));
Felix Fietkau0e5ded52010-01-08 18:10:58 +0100126 while (sta) {
127 if ((sta->sdata == sdata ||
Johannes Berga2c1e3d2010-09-14 21:34:14 +0200128 (sta->sdata->bss && sta->sdata->bss == sdata->bss)) &&
Felix Fietkau0e5ded52010-01-08 18:10:58 +0100129 memcmp(sta->sta.addr, addr, ETH_ALEN) == 0)
130 break;
Johannes Berg03791852010-04-06 11:18:42 +0200131 sta = rcu_dereference_check(sta->hnext,
132 rcu_read_lock_held() ||
133 lockdep_is_held(&local->sta_lock) ||
134 lockdep_is_held(&local->sta_mtx));
Felix Fietkau0e5ded52010-01-08 18:10:58 +0100135 }
136 return sta;
137}
138
Johannes Berg3b53fde82009-11-16 12:00:37 +0100139struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
140 int idx)
Luis Carlos Coboee385852008-02-23 15:17:11 +0100141{
Johannes Berg3b53fde82009-11-16 12:00:37 +0100142 struct ieee80211_local *local = sdata->local;
Luis Carlos Coboee385852008-02-23 15:17:11 +0100143 struct sta_info *sta;
144 int i = 0;
145
Johannes Bergd0709a62008-02-25 16:27:46 +0100146 list_for_each_entry_rcu(sta, &local->sta_list, list) {
Johannes Berg3b53fde82009-11-16 12:00:37 +0100147 if (sdata != sta->sdata)
Luis Carlos Cobo2a8ca292008-02-29 17:51:25 -0800148 continue;
Luis Carlos Coboee385852008-02-23 15:17:11 +0100149 if (i < idx) {
150 ++i;
151 continue;
Luis Carlos Coboee385852008-02-23 15:17:11 +0100152 }
Luis Carlos Cobo2a8ca292008-02-29 17:51:25 -0800153 return sta;
Luis Carlos Coboee385852008-02-23 15:17:11 +0100154 }
Luis Carlos Coboee385852008-02-23 15:17:11 +0100155
156 return NULL;
157}
Jiri Bencf0706e82007-05-05 11:45:53 -0700158
Johannes Berg93e5deb2008-04-01 15:21:00 +0200159/**
160 * __sta_info_free - internal STA free helper
161 *
Randy Dunlap6ef307b2008-07-03 13:52:18 -0700162 * @local: pointer to the global information
Johannes Berg93e5deb2008-04-01 15:21:00 +0200163 * @sta: STA info to free
164 *
165 * This function must undo everything done by sta_info_alloc()
166 * that may happen before sta_info_insert().
167 */
168static void __sta_info_free(struct ieee80211_local *local,
169 struct sta_info *sta)
170{
Johannes Bergaf65cd962009-11-17 18:18:36 +0100171 if (sta->rate_ctrl) {
172 rate_control_free_sta(sta);
173 rate_control_put(sta->rate_ctrl);
174 }
Johannes Berg93e5deb2008-04-01 15:21:00 +0200175
176#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
Joe Perches0fb9a9e2010-08-20 16:25:38 -0700177 wiphy_debug(local->hw.wiphy, "Destroyed STA %pM\n", sta->sta.addr);
Johannes Berg93e5deb2008-04-01 15:21:00 +0200178#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
179
180 kfree(sta);
181}
182
Johannes Bergd0709a62008-02-25 16:27:46 +0100183/* Caller must hold local->sta_lock */
184static void sta_info_hash_add(struct ieee80211_local *local,
185 struct sta_info *sta)
Jiri Bencf0706e82007-05-05 11:45:53 -0700186{
Johannes Berg17741cd2008-09-11 00:02:02 +0200187 sta->hnext = local->sta_hash[STA_HASH(sta->sta.addr)];
188 rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)], sta);
Jiri Bencf0706e82007-05-05 11:45:53 -0700189}
Jiri Bencf0706e82007-05-05 11:45:53 -0700190
Johannes Bergaf818582009-11-06 11:35:50 +0100191static void sta_unblock(struct work_struct *wk)
192{
193 struct sta_info *sta;
194
195 sta = container_of(wk, struct sta_info, drv_unblock_wk);
196
197 if (sta->dead)
198 return;
199
200 if (!test_sta_flags(sta, WLAN_STA_PS_STA))
201 ieee80211_sta_ps_deliver_wakeup(sta);
Johannes Berg50a94322010-11-16 11:50:28 -0800202 else if (test_and_clear_sta_flags(sta, WLAN_STA_PSPOLL)) {
203 clear_sta_flags(sta, WLAN_STA_PS_DRIVER);
Johannes Bergaf818582009-11-06 11:35:50 +0100204 ieee80211_sta_ps_deliver_poll_response(sta);
Johannes Berg50a94322010-11-16 11:50:28 -0800205 } else
206 clear_sta_flags(sta, WLAN_STA_PS_DRIVER);
Johannes Bergaf818582009-11-06 11:35:50 +0100207}
208
Johannes Bergaf65cd962009-11-17 18:18:36 +0100209static int sta_prepare_rate_control(struct ieee80211_local *local,
210 struct sta_info *sta, gfp_t gfp)
211{
212 if (local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)
213 return 0;
214
215 sta->rate_ctrl = rate_control_get(local->rate_ctrl);
216 sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl,
217 &sta->sta, gfp);
218 if (!sta->rate_ctrl_priv) {
219 rate_control_put(sta->rate_ctrl);
220 return -ENOMEM;
221 }
222
223 return 0;
224}
225
Johannes Berg73651ee2008-02-25 16:27:47 +0100226struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
227 u8 *addr, gfp_t gfp)
Jiri Bencf0706e82007-05-05 11:45:53 -0700228{
Johannes Bergd0709a62008-02-25 16:27:46 +0100229 struct ieee80211_local *local = sdata->local;
Jiri Bencf0706e82007-05-05 11:45:53 -0700230 struct sta_info *sta;
Ron Rindjunsky16c5f152007-12-25 17:00:34 +0200231 int i;
Jiri Bencf0706e82007-05-05 11:45:53 -0700232
Johannes Berg17741cd2008-09-11 00:02:02 +0200233 sta = kzalloc(sizeof(*sta) + local->hw.sta_data_size, gfp);
Jiri Bencf0706e82007-05-05 11:45:53 -0700234 if (!sta)
Johannes Berg73651ee2008-02-25 16:27:47 +0100235 return NULL;
Jiri Bencf0706e82007-05-05 11:45:53 -0700236
Johannes Berg07346f812008-05-03 01:02:02 +0200237 spin_lock_init(&sta->lock);
Johannes Berg5a9f7b02008-06-18 14:58:09 +0200238 spin_lock_init(&sta->flaglock);
Johannes Bergaf818582009-11-06 11:35:50 +0100239 INIT_WORK(&sta->drv_unblock_wk, sta_unblock);
Johannes Berg67c282c2010-06-10 10:21:43 +0200240 INIT_WORK(&sta->ampdu_mlme.work, ieee80211_ba_session_work);
Johannes Berga93e3642010-06-10 10:21:46 +0200241 mutex_init(&sta->ampdu_mlme.mtx);
Johannes Berg07346f812008-05-03 01:02:02 +0200242
Johannes Berg17741cd2008-09-11 00:02:02 +0200243 memcpy(sta->sta.addr, addr, ETH_ALEN);
Johannes Bergd0709a62008-02-25 16:27:46 +0100244 sta->local = local;
245 sta->sdata = sdata;
Jiri Bencf0706e82007-05-05 11:45:53 -0700246
Bruno Randolf541a45a2010-12-02 19:12:43 +0900247 ewma_init(&sta->avg_signal, 1024, 8);
248
Johannes Bergaf65cd962009-11-17 18:18:36 +0100249 if (sta_prepare_rate_control(local, sta, gfp)) {
Jiri Bencf0706e82007-05-05 11:45:53 -0700250 kfree(sta);
Johannes Berg73651ee2008-02-25 16:27:47 +0100251 return NULL;
Jiri Bencf0706e82007-05-05 11:45:53 -0700252 }
253
Ron Rindjunsky16c5f152007-12-25 17:00:34 +0200254 for (i = 0; i < STA_TID_NUM; i++) {
Johannes Berga622ab72010-06-10 10:21:39 +0200255 /*
256 * timer_to_tid must be initialized with identity mapping
257 * to enable session_timer's data differentiation. See
258 * sta_rx_agg_session_timer_expired for usage.
259 */
Ron Rindjunsky16c5f152007-12-25 17:00:34 +0200260 sta->timer_to_tid[i] = i;
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
Senthil Balasubramaniancccaec92009-05-14 18:42:08 +0530265 for (i = 0; i < NUM_RX_DATA_QUEUES; i++)
Alexey Dobriyan4be929b2010-05-24 14:33:03 -0700266 sta->last_seq_ctrl[i] = cpu_to_le16(USHRT_MAX);
Senthil Balasubramaniancccaec92009-05-14 18:42:08 +0530267
Johannes Berg73651ee2008-02-25 16:27:47 +0100268#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
Joe Perches0fb9a9e2010-08-20 16:25:38 -0700269 wiphy_debug(local->hw.wiphy, "Allocated STA %pM\n", sta->sta.addr);
Johannes Berg73651ee2008-02-25 16:27:47 +0100270#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
271
Johannes Berg03e44972008-02-27 09:56:40 +0100272#ifdef CONFIG_MAC80211_MESH
Luis Carlos Cobob4e08ea2008-02-29 15:46:08 -0800273 sta->plink_state = PLINK_LISTEN;
Johannes Berg03e44972008-02-27 09:56:40 +0100274 init_timer(&sta->plink_timer);
275#endif
276
Johannes Berg73651ee2008-02-25 16:27:47 +0100277 return sta;
278}
279
Johannes Berg34e89502010-02-03 13:59:58 +0100280static int sta_info_finish_insert(struct sta_info *sta, bool async)
Johannes Berg73651ee2008-02-25 16:27:47 +0100281{
282 struct ieee80211_local *local = sta->local;
283 struct ieee80211_sub_if_data *sdata = sta->sdata;
Johannes Berg98b62182009-12-23 13:15:44 +0100284 struct station_info sinfo;
Johannes Berg73651ee2008-02-25 16:27:47 +0100285 unsigned long flags;
Johannes Berg93e5deb2008-04-01 15:21:00 +0200286 int err = 0;
Johannes Berg73651ee2008-02-25 16:27:47 +0100287
Johannes Berg46a5eba2010-09-15 13:28:15 +0200288 lockdep_assert_held(&local->sta_mtx);
Johannes Berg34e89502010-02-03 13:59:58 +0100289
290 /* notify driver */
291 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
292 sdata = container_of(sdata->bss,
293 struct ieee80211_sub_if_data,
294 u.ap);
295 err = drv_sta_add(local, sdata, &sta->sta);
296 if (err) {
297 if (!async)
298 return err;
299 printk(KERN_DEBUG "%s: failed to add IBSS STA %pM to driver (%d)"
300 " - keeping it anyway.\n",
301 sdata->name, sta->sta.addr, err);
302 } else {
303 sta->uploaded = true;
304#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
305 if (async)
Joe Perches0fb9a9e2010-08-20 16:25:38 -0700306 wiphy_debug(local->hw.wiphy,
307 "Finished adding IBSS STA %pM\n",
308 sta->sta.addr);
Johannes Berg34e89502010-02-03 13:59:58 +0100309#endif
310 }
311
312 sdata = sta->sdata;
313
314 if (!async) {
315 local->num_sta++;
316 local->sta_generation++;
317 smp_mb();
318
319 /* make the station visible */
320 spin_lock_irqsave(&local->sta_lock, flags);
321 sta_info_hash_add(local, sta);
322 spin_unlock_irqrestore(&local->sta_lock, flags);
323 }
324
325 list_add(&sta->list, &local->sta_list);
326
327 ieee80211_sta_debugfs_add(sta);
328 rate_control_add_sta_debugfs(sta);
329
330 sinfo.filled = 0;
331 sinfo.generation = local->sta_generation;
332 cfg80211_new_sta(sdata->dev, sta->sta.addr, &sinfo, GFP_KERNEL);
333
334
335 return 0;
336}
337
338static void sta_info_finish_pending(struct ieee80211_local *local)
339{
340 struct sta_info *sta;
341 unsigned long flags;
342
343 spin_lock_irqsave(&local->sta_lock, flags);
344 while (!list_empty(&local->sta_pending_list)) {
345 sta = list_first_entry(&local->sta_pending_list,
346 struct sta_info, list);
347 list_del(&sta->list);
348 spin_unlock_irqrestore(&local->sta_lock, flags);
349
350 sta_info_finish_insert(sta, true);
351
352 spin_lock_irqsave(&local->sta_lock, flags);
353 }
354 spin_unlock_irqrestore(&local->sta_lock, flags);
355}
356
357static void sta_info_finish_work(struct work_struct *work)
358{
359 struct ieee80211_local *local =
360 container_of(work, struct ieee80211_local, sta_finish_work);
361
362 mutex_lock(&local->sta_mtx);
363 sta_info_finish_pending(local);
364 mutex_unlock(&local->sta_mtx);
365}
366
367int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU)
368{
369 struct ieee80211_local *local = sta->local;
370 struct ieee80211_sub_if_data *sdata = sta->sdata;
371 unsigned long flags;
372 int err = 0;
373
Johannes Berg03e44972008-02-27 09:56:40 +0100374 /*
375 * Can't be a WARN_ON because it can be triggered through a race:
376 * something inserts a STA (on one CPU) without holding the RTNL
377 * and another CPU turns off the net device.
378 */
Johannes Berg9607e6b2009-12-23 13:15:31 +0100379 if (unlikely(!ieee80211_sdata_running(sdata))) {
Johannes Berg93e5deb2008-04-01 15:21:00 +0200380 err = -ENETDOWN;
Johannes Berg34e89502010-02-03 13:59:58 +0100381 rcu_read_lock();
Johannes Berg93e5deb2008-04-01 15:21:00 +0200382 goto out_free;
383 }
Johannes Berg03e44972008-02-27 09:56:40 +0100384
Johannes Berg47846c92009-11-25 17:46:19 +0100385 if (WARN_ON(compare_ether_addr(sta->sta.addr, sdata->vif.addr) == 0 ||
Johannes Bergc6a1fa12008-10-07 12:04:32 +0200386 is_multicast_ether_addr(sta->sta.addr))) {
Johannes Berg93e5deb2008-04-01 15:21:00 +0200387 err = -EINVAL;
Johannes Berg34e89502010-02-03 13:59:58 +0100388 rcu_read_lock();
Johannes Berg93e5deb2008-04-01 15:21:00 +0200389 goto out_free;
390 }
Johannes Berg44213b52008-02-25 16:27:49 +0100391
Johannes Berg34e89502010-02-03 13:59:58 +0100392 /*
393 * In ad-hoc mode, we sometimes need to insert stations
394 * from tasklet context from the RX path. To avoid races,
395 * always do so in that case -- see the comment below.
396 */
397 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
398 spin_lock_irqsave(&local->sta_lock, flags);
399 /* check if STA exists already */
400 if (sta_info_get_bss(sdata, sta->sta.addr)) {
401 spin_unlock_irqrestore(&local->sta_lock, flags);
402 rcu_read_lock();
403 err = -EEXIST;
404 goto out_free;
405 }
406
407 local->num_sta++;
408 local->sta_generation++;
409 smp_mb();
410 sta_info_hash_add(local, sta);
411
412 list_add_tail(&sta->list, &local->sta_pending_list);
413
414 rcu_read_lock();
415 spin_unlock_irqrestore(&local->sta_lock, flags);
416
417#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
Joe Perches0fb9a9e2010-08-20 16:25:38 -0700418 wiphy_debug(local->hw.wiphy, "Added IBSS STA %pM\n",
419 sta->sta.addr);
Johannes Berg34e89502010-02-03 13:59:58 +0100420#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
421
422 ieee80211_queue_work(&local->hw, &local->sta_finish_work);
423
424 return 0;
425 }
426
427 /*
428 * On first glance, this will look racy, because the code
429 * below this point, which inserts a station with sleeping,
430 * unlocks the sta_lock between checking existence in the
431 * hash table and inserting into it.
432 *
433 * However, it is not racy against itself because it keeps
434 * the mutex locked. It still seems to race against the
435 * above code that atomically inserts the station... That,
436 * however, is not true because the above code can only
437 * be invoked for IBSS interfaces, and the below code will
438 * not be -- and the two do not race against each other as
439 * the hash table also keys off the interface.
440 */
441
442 might_sleep();
443
444 mutex_lock(&local->sta_mtx);
445
Johannes Bergd0709a62008-02-25 16:27:46 +0100446 spin_lock_irqsave(&local->sta_lock, flags);
Johannes Berg43ba7e92008-02-21 14:09:30 +0100447 /* check if STA exists already */
Johannes Berg34e89502010-02-03 13:59:58 +0100448 if (sta_info_get_bss(sdata, sta->sta.addr)) {
Johannes Bergd0709a62008-02-25 16:27:46 +0100449 spin_unlock_irqrestore(&local->sta_lock, flags);
Jouni Malinen38a679a2010-03-06 18:35:08 +0200450 mutex_unlock(&local->sta_mtx);
Johannes Berg34e89502010-02-03 13:59:58 +0100451 rcu_read_lock();
Johannes Berg93e5deb2008-04-01 15:21:00 +0200452 err = -EEXIST;
453 goto out_free;
Johannes Berg43ba7e92008-02-21 14:09:30 +0100454 }
Johannes Berg32bfd352007-12-19 01:31:26 +0100455
Johannes Berg34e89502010-02-03 13:59:58 +0100456 spin_unlock_irqrestore(&local->sta_lock, flags);
Johannes Berg32bfd352007-12-19 01:31:26 +0100457
Johannes Berg34e89502010-02-03 13:59:58 +0100458 err = sta_info_finish_insert(sta, false);
459 if (err) {
460 mutex_unlock(&local->sta_mtx);
461 rcu_read_lock();
462 goto out_free;
Johannes Berg32bfd352007-12-19 01:31:26 +0100463 }
Johannes Bergd0709a62008-02-25 16:27:46 +0100464
Jiri Bencf0706e82007-05-05 11:45:53 -0700465#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
Joe Perches0fb9a9e2010-08-20 16:25:38 -0700466 wiphy_debug(local->hw.wiphy, "Inserted STA %pM\n", sta->sta.addr);
Jiri Bencf0706e82007-05-05 11:45:53 -0700467#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
468
Johannes Berg34e89502010-02-03 13:59:58 +0100469 /* move reference to rcu-protected */
470 rcu_read_lock();
471 mutex_unlock(&local->sta_mtx);
Jiri Bence9f207f2007-05-05 11:46:38 -0700472
Johannes Berg73651ee2008-02-25 16:27:47 +0100473 if (ieee80211_vif_is_mesh(&sdata->vif))
474 mesh_accept_plinks_update(sdata);
475
476 return 0;
Johannes Berg93e5deb2008-04-01 15:21:00 +0200477 out_free:
478 BUG_ON(!err);
479 __sta_info_free(local, sta);
480 return err;
Jiri Bencf0706e82007-05-05 11:45:53 -0700481}
482
Johannes Berg34e89502010-02-03 13:59:58 +0100483int sta_info_insert(struct sta_info *sta)
484{
485 int err = sta_info_insert_rcu(sta);
486
487 rcu_read_unlock();
488
489 return err;
490}
491
Johannes Berg004c8722008-02-20 11:21:35 +0100492static inline void __bss_tim_set(struct ieee80211_if_ap *bss, u16 aid)
493{
494 /*
495 * This format has been mandated by the IEEE specifications,
496 * so this line may not be changed to use the __set_bit() format.
497 */
498 bss->tim[aid / 8] |= (1 << (aid % 8));
499}
500
501static inline void __bss_tim_clear(struct ieee80211_if_ap *bss, u16 aid)
502{
503 /*
504 * This format has been mandated by the IEEE specifications,
505 * so this line may not be changed to use the __clear_bit() format.
506 */
507 bss->tim[aid / 8] &= ~(1 << (aid % 8));
508}
509
510static void __sta_info_set_tim_bit(struct ieee80211_if_ap *bss,
511 struct sta_info *sta)
512{
Johannes Berg3e122be2008-07-09 14:40:34 +0200513 BUG_ON(!bss);
514
Johannes Berg17741cd2008-09-11 00:02:02 +0200515 __bss_tim_set(bss, sta->sta.aid);
Johannes Berg3e122be2008-07-09 14:40:34 +0200516
Johannes Bergd0709a62008-02-25 16:27:46 +0100517 if (sta->local->ops->set_tim) {
518 sta->local->tim_in_locked_section = true;
Johannes Berg24487982009-04-23 18:52:52 +0200519 drv_set_tim(sta->local, &sta->sta, true);
Johannes Bergd0709a62008-02-25 16:27:46 +0100520 sta->local->tim_in_locked_section = false;
521 }
Johannes Berg004c8722008-02-20 11:21:35 +0100522}
523
524void sta_info_set_tim_bit(struct sta_info *sta)
525{
Johannes Bergd0709a62008-02-25 16:27:46 +0100526 unsigned long flags;
Johannes Berg004c8722008-02-20 11:21:35 +0100527
Johannes Berg3e122be2008-07-09 14:40:34 +0200528 BUG_ON(!sta->sdata->bss);
529
Johannes Bergd0709a62008-02-25 16:27:46 +0100530 spin_lock_irqsave(&sta->local->sta_lock, flags);
531 __sta_info_set_tim_bit(sta->sdata->bss, sta);
532 spin_unlock_irqrestore(&sta->local->sta_lock, flags);
Johannes Berg004c8722008-02-20 11:21:35 +0100533}
534
535static void __sta_info_clear_tim_bit(struct ieee80211_if_ap *bss,
536 struct sta_info *sta)
537{
Johannes Berg3e122be2008-07-09 14:40:34 +0200538 BUG_ON(!bss);
539
Johannes Berg17741cd2008-09-11 00:02:02 +0200540 __bss_tim_clear(bss, sta->sta.aid);
Johannes Berg3e122be2008-07-09 14:40:34 +0200541
Johannes Bergd0709a62008-02-25 16:27:46 +0100542 if (sta->local->ops->set_tim) {
543 sta->local->tim_in_locked_section = true;
Johannes Berg24487982009-04-23 18:52:52 +0200544 drv_set_tim(sta->local, &sta->sta, false);
Johannes Bergd0709a62008-02-25 16:27:46 +0100545 sta->local->tim_in_locked_section = false;
546 }
Johannes Berg004c8722008-02-20 11:21:35 +0100547}
548
549void sta_info_clear_tim_bit(struct sta_info *sta)
550{
Johannes Bergd0709a62008-02-25 16:27:46 +0100551 unsigned long flags;
Johannes Berg004c8722008-02-20 11:21:35 +0100552
Johannes Berg3e122be2008-07-09 14:40:34 +0200553 BUG_ON(!sta->sdata->bss);
554
Johannes Bergd0709a62008-02-25 16:27:46 +0100555 spin_lock_irqsave(&sta->local->sta_lock, flags);
556 __sta_info_clear_tim_bit(sta->sdata->bss, sta);
557 spin_unlock_irqrestore(&sta->local->sta_lock, flags);
Johannes Berg004c8722008-02-20 11:21:35 +0100558}
559
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
Juuso Oikarinen3393a602010-04-19 10:12:52 +0300581static bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
Jiri Bencf0706e82007-05-05 11:45:53 -0700582 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))
Juuso Oikarinen3393a602010-04-19 10:12:52 +0300589 return false;
Jiri Bencf0706e82007-05-05 11:45:53 -0700590
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 }
Juuso Oikarinen3393a602010-04-19 10:12:52 +0300614
615 return true;
Jiri Bencf0706e82007-05-05 11:45:53 -0700616}
617
Johannes Berg34e89502010-02-03 13:59:58 +0100618static int __must_check __sta_info_destroy(struct sta_info *sta)
619{
620 struct ieee80211_local *local;
621 struct ieee80211_sub_if_data *sdata;
622 struct sk_buff *skb;
623 unsigned long flags;
Johannes Berge31b8212010-10-05 19:39:30 +0200624 int ret, i;
Johannes Berg34e89502010-02-03 13:59:58 +0100625
626 might_sleep();
627
628 if (!sta)
629 return -ENOENT;
630
631 local = sta->local;
632 sdata = sta->sdata;
633
Johannes Berg098a6072010-04-06 11:18:47 +0200634 /*
635 * Before removing the station from the driver and
636 * rate control, it might still start new aggregation
637 * sessions -- block that to make sure the tear-down
638 * will be sufficient.
639 */
640 set_sta_flags(sta, WLAN_STA_BLOCK_BA);
Johannes Berg53f73c02010-10-05 19:37:40 +0200641 ieee80211_sta_tear_down_BA_sessions(sta, true);
Johannes Berg098a6072010-04-06 11:18:47 +0200642
Johannes Berg34e89502010-02-03 13:59:58 +0100643 spin_lock_irqsave(&local->sta_lock, flags);
644 ret = sta_info_hash_del(local, sta);
645 /* this might still be the pending list ... which is fine */
646 if (!ret)
647 list_del(&sta->list);
648 spin_unlock_irqrestore(&local->sta_lock, flags);
649 if (ret)
650 return ret;
651
Johannes Berge31b8212010-10-05 19:39:30 +0200652 for (i = 0; i < NUM_DEFAULT_KEYS; i++)
653 ieee80211_key_free(local, sta->gtk[i]);
654 if (sta->ptk)
655 ieee80211_key_free(local, sta->ptk);
Johannes Berg34e89502010-02-03 13:59:58 +0100656
657 sta->dead = true;
658
659 if (test_and_clear_sta_flags(sta,
660 WLAN_STA_PS_STA | WLAN_STA_PS_DRIVER)) {
661 BUG_ON(!sdata->bss);
662
663 atomic_dec(&sdata->bss->num_sta_ps);
664 __sta_info_clear_tim_bit(sdata->bss, sta);
665 }
666
667 local->num_sta--;
668 local->sta_generation++;
669
670 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
671 rcu_assign_pointer(sdata->u.vlan.sta, NULL);
672
673 if (sta->uploaded) {
674 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
675 sdata = container_of(sdata->bss,
676 struct ieee80211_sub_if_data,
677 u.ap);
678 drv_sta_remove(local, sdata, &sta->sta);
679 sdata = sta->sdata;
680 }
681
Johannes Berge64b3792010-04-06 11:18:43 +0200682 /*
683 * At this point, after we wait for an RCU grace period,
684 * neither mac80211 nor the driver can reference this
685 * sta struct any more except by still existing timers
686 * associated with this station that we clean up below.
687 */
688 synchronize_rcu();
689
Johannes Berg34e89502010-02-03 13:59:58 +0100690#ifdef CONFIG_MAC80211_MESH
Johannes Berge64b3792010-04-06 11:18:43 +0200691 if (ieee80211_vif_is_mesh(&sdata->vif))
Johannes Berg34e89502010-02-03 13:59:58 +0100692 mesh_accept_plinks_update(sdata);
Johannes Berg34e89502010-02-03 13:59:58 +0100693#endif
694
695#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
Joe Perches0fb9a9e2010-08-20 16:25:38 -0700696 wiphy_debug(local->hw.wiphy, "Removed STA %pM\n", sta->sta.addr);
Johannes Berg34e89502010-02-03 13:59:58 +0100697#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
698 cancel_work_sync(&sta->drv_unblock_wk);
699
700 rate_control_remove_sta_debugfs(sta);
701 ieee80211_sta_debugfs_remove(sta);
702
703#ifdef CONFIG_MAC80211_MESH
704 if (ieee80211_vif_is_mesh(&sta->sdata->vif)) {
705 mesh_plink_deactivate(sta);
706 del_timer_sync(&sta->plink_timer);
707 }
708#endif
709
710 while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
711 local->total_ps_buffered--;
712 dev_kfree_skb_any(skb);
713 }
714
715 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL)
716 dev_kfree_skb_any(skb);
717
Johannes Berg34e89502010-02-03 13:59:58 +0100718 __sta_info_free(local, sta);
719
720 return 0;
721}
722
723int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, const u8 *addr)
724{
725 struct sta_info *sta;
726 int ret;
727
728 mutex_lock(&sdata->local->sta_mtx);
729 sta = sta_info_get(sdata, addr);
730 ret = __sta_info_destroy(sta);
731 mutex_unlock(&sdata->local->sta_mtx);
732
733 return ret;
734}
735
736int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
737 const u8 *addr)
738{
739 struct sta_info *sta;
740 int ret;
741
742 mutex_lock(&sdata->local->sta_mtx);
743 sta = sta_info_get_bss(sdata, addr);
744 ret = __sta_info_destroy(sta);
745 mutex_unlock(&sdata->local->sta_mtx);
746
747 return ret;
748}
Jiri Bencf0706e82007-05-05 11:45:53 -0700749
750static void sta_info_cleanup(unsigned long data)
751{
752 struct ieee80211_local *local = (struct ieee80211_local *) data;
753 struct sta_info *sta;
Juuso Oikarinen3393a602010-04-19 10:12:52 +0300754 bool timer_needed = false;
Jiri Bencf0706e82007-05-05 11:45:53 -0700755
Johannes Bergd0709a62008-02-25 16:27:46 +0100756 rcu_read_lock();
757 list_for_each_entry_rcu(sta, &local->sta_list, list)
Juuso Oikarinen3393a602010-04-19 10:12:52 +0300758 if (sta_info_cleanup_expire_buffered(local, sta))
759 timer_needed = true;
Johannes Bergd0709a62008-02-25 16:27:46 +0100760 rcu_read_unlock();
Jiri Bencf0706e82007-05-05 11:45:53 -0700761
Johannes Berg5bb644a2009-05-17 11:40:42 +0200762 if (local->quiescing)
763 return;
764
Juuso Oikarinen3393a602010-04-19 10:12:52 +0300765 if (!timer_needed)
766 return;
767
Johannes Berg0d174402007-12-17 15:07:43 +0100768 local->sta_cleanup.expires =
769 round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL);
Jiri Bencf0706e82007-05-05 11:45:53 -0700770 add_timer(&local->sta_cleanup);
771}
772
773void sta_info_init(struct ieee80211_local *local)
774{
Johannes Bergd0709a62008-02-25 16:27:46 +0100775 spin_lock_init(&local->sta_lock);
Johannes Berg34e89502010-02-03 13:59:58 +0100776 mutex_init(&local->sta_mtx);
Jiri Bencf0706e82007-05-05 11:45:53 -0700777 INIT_LIST_HEAD(&local->sta_list);
Johannes Berg34e89502010-02-03 13:59:58 +0100778 INIT_LIST_HEAD(&local->sta_pending_list);
779 INIT_WORK(&local->sta_finish_work, sta_info_finish_work);
Jiri Bencf0706e82007-05-05 11:45:53 -0700780
Pavel Emelyanovb24b8a22008-01-23 21:20:07 -0800781 setup_timer(&local->sta_cleanup, sta_info_cleanup,
782 (unsigned long)local);
Johannes Berg0d174402007-12-17 15:07:43 +0100783 local->sta_cleanup.expires =
784 round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL);
Jiri Bencf0706e82007-05-05 11:45:53 -0700785}
786
787int sta_info_start(struct ieee80211_local *local)
788{
789 add_timer(&local->sta_cleanup);
790 return 0;
791}
792
793void sta_info_stop(struct ieee80211_local *local)
794{
Jiri Bencf0706e82007-05-05 11:45:53 -0700795 del_timer(&local->sta_cleanup);
Michael Wube8755e2007-07-27 15:43:23 +0200796 sta_info_flush(local, NULL);
Jiri Bencf0706e82007-05-05 11:45:53 -0700797}
798
Jiri Bencf0706e82007-05-05 11:45:53 -0700799/**
800 * sta_info_flush - flush matching STA entries from the STA table
Johannes Berg44213b52008-02-25 16:27:49 +0100801 *
802 * Returns the number of removed STA entries.
803 *
Jiri Bencf0706e82007-05-05 11:45:53 -0700804 * @local: local interface data
Johannes Bergd0709a62008-02-25 16:27:46 +0100805 * @sdata: matching rule for the net device (sta->dev) or %NULL to match all STAs
Jiri Bencf0706e82007-05-05 11:45:53 -0700806 */
Johannes Berg44213b52008-02-25 16:27:49 +0100807int sta_info_flush(struct ieee80211_local *local,
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200808 struct ieee80211_sub_if_data *sdata)
Jiri Bencf0706e82007-05-05 11:45:53 -0700809{
810 struct sta_info *sta, *tmp;
Johannes Berg44213b52008-02-25 16:27:49 +0100811 int ret = 0;
Jiri Bencf0706e82007-05-05 11:45:53 -0700812
Johannes Bergd0709a62008-02-25 16:27:46 +0100813 might_sleep();
814
Johannes Berg34e89502010-02-03 13:59:58 +0100815 mutex_lock(&local->sta_mtx);
Johannes Bergd0709a62008-02-25 16:27:46 +0100816
Johannes Berg34e89502010-02-03 13:59:58 +0100817 sta_info_finish_pending(local);
818
819 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
820 if (!sdata || sdata == sta->sdata)
821 WARN_ON(__sta_info_destroy(sta));
822 }
823 mutex_unlock(&local->sta_mtx);
Johannes Berg44213b52008-02-25 16:27:49 +0100824
825 return ret;
Jiri Bencf0706e82007-05-05 11:45:53 -0700826}
Johannes Bergdc6676b2008-03-31 19:23:03 +0200827
Johannes Berg24723d12008-09-11 00:01:46 +0200828void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
829 unsigned long exp_time)
830{
831 struct ieee80211_local *local = sdata->local;
832 struct sta_info *sta, *tmp;
Johannes Berg24723d12008-09-11 00:01:46 +0200833
Johannes Berg34e89502010-02-03 13:59:58 +0100834 mutex_lock(&local->sta_mtx);
Johannes Berg24723d12008-09-11 00:01:46 +0200835 list_for_each_entry_safe(sta, tmp, &local->sta_list, list)
836 if (time_after(jiffies, sta->last_rx + exp_time)) {
837#ifdef CONFIG_MAC80211_IBSS_DEBUG
Johannes Berg0c68ae262008-10-27 15:56:10 -0700838 printk(KERN_DEBUG "%s: expiring inactive STA %pM\n",
Johannes Berg47846c92009-11-25 17:46:19 +0100839 sdata->name, sta->sta.addr);
Johannes Berg24723d12008-09-11 00:01:46 +0200840#endif
Johannes Berg34e89502010-02-03 13:59:58 +0100841 WARN_ON(__sta_info_destroy(sta));
Johannes Berg24723d12008-09-11 00:01:46 +0200842 }
Johannes Berg34e89502010-02-03 13:59:58 +0100843 mutex_unlock(&local->sta_mtx);
Johannes Berg24723d12008-09-11 00:01:46 +0200844}
Johannes Berg17741cd2008-09-11 00:02:02 +0200845
Ben Greear686b9cb2010-09-23 09:44:36 -0700846struct ieee80211_sta *ieee80211_find_sta_by_ifaddr(struct ieee80211_hw *hw,
847 const u8 *addr,
848 const u8 *localaddr)
Johannes Berg17741cd2008-09-11 00:02:02 +0200849{
Johannes Bergabe60632009-11-25 17:46:18 +0100850 struct sta_info *sta, *nxt;
Johannes Berg17741cd2008-09-11 00:02:02 +0200851
Ben Greear686b9cb2010-09-23 09:44:36 -0700852 /*
853 * Just return a random station if localaddr is NULL
854 * ... first in list.
855 */
Johannes Bergf7c65592010-04-30 13:48:36 +0200856 for_each_sta_info(hw_to_local(hw), addr, sta, nxt) {
Ben Greear686b9cb2010-09-23 09:44:36 -0700857 if (localaddr &&
858 compare_ether_addr(sta->sdata->vif.addr, localaddr) != 0)
859 continue;
Johannes Bergf7c65592010-04-30 13:48:36 +0200860 if (!sta->uploaded)
861 return NULL;
Johannes Bergabe60632009-11-25 17:46:18 +0100862 return &sta->sta;
Johannes Bergf7c65592010-04-30 13:48:36 +0200863 }
864
Johannes Bergabe60632009-11-25 17:46:18 +0100865 return NULL;
Johannes Berg17741cd2008-09-11 00:02:02 +0200866}
Ben Greear686b9cb2010-09-23 09:44:36 -0700867EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr);
Johannes Berg5ed176e2009-11-04 14:42:28 +0100868
869struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif,
870 const u8 *addr)
871{
Johannes Bergf7c65592010-04-30 13:48:36 +0200872 struct sta_info *sta;
Johannes Berg5ed176e2009-11-04 14:42:28 +0100873
874 if (!vif)
875 return NULL;
876
Johannes Bergf7c65592010-04-30 13:48:36 +0200877 sta = sta_info_get_bss(vif_to_sdata(vif), addr);
878 if (!sta)
879 return NULL;
Johannes Berg5ed176e2009-11-04 14:42:28 +0100880
Johannes Bergf7c65592010-04-30 13:48:36 +0200881 if (!sta->uploaded)
882 return NULL;
883
884 return &sta->sta;
Johannes Berg5ed176e2009-11-04 14:42:28 +0100885}
Johannes Berg17741cd2008-09-11 00:02:02 +0200886EXPORT_SYMBOL(ieee80211_find_sta);
Johannes Bergaf818582009-11-06 11:35:50 +0100887
Johannes Berg50a94322010-11-16 11:50:28 -0800888static void clear_sta_ps_flags(void *_sta)
889{
890 struct sta_info *sta = _sta;
891
892 clear_sta_flags(sta, WLAN_STA_PS_DRIVER | WLAN_STA_PS_STA);
893}
894
Johannes Bergaf818582009-11-06 11:35:50 +0100895/* powersave support code */
896void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta)
897{
898 struct ieee80211_sub_if_data *sdata = sta->sdata;
899 struct ieee80211_local *local = sdata->local;
900 int sent, buffered;
901
Johannes Berg12375ef2009-11-25 20:30:31 +0100902 drv_sta_notify(local, sdata, STA_NOTIFY_AWAKE, &sta->sta);
Johannes Bergaf818582009-11-06 11:35:50 +0100903
904 if (!skb_queue_empty(&sta->ps_tx_buf))
905 sta_info_clear_tim_bit(sta);
906
907 /* Send all buffered frames to the station */
908 sent = ieee80211_add_pending_skbs(local, &sta->tx_filtered);
Johannes Berg50a94322010-11-16 11:50:28 -0800909 buffered = ieee80211_add_pending_skbs_fn(local, &sta->ps_tx_buf,
910 clear_sta_ps_flags, sta);
Johannes Bergaf818582009-11-06 11:35:50 +0100911 sent += buffered;
912 local->total_ps_buffered -= buffered;
913
914#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
915 printk(KERN_DEBUG "%s: STA %pM aid %d sending %d filtered/%d PS frames "
Johannes Berg47846c92009-11-25 17:46:19 +0100916 "since STA not sleeping anymore\n", sdata->name,
Johannes Bergaf818582009-11-06 11:35:50 +0100917 sta->sta.addr, sta->sta.aid, sent - buffered, buffered);
918#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
919}
920
921void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta)
922{
923 struct ieee80211_sub_if_data *sdata = sta->sdata;
924 struct ieee80211_local *local = sdata->local;
925 struct sk_buff *skb;
926 int no_pending_pkts;
927
928 skb = skb_dequeue(&sta->tx_filtered);
929 if (!skb) {
930 skb = skb_dequeue(&sta->ps_tx_buf);
931 if (skb)
932 local->total_ps_buffered--;
933 }
934 no_pending_pkts = skb_queue_empty(&sta->tx_filtered) &&
935 skb_queue_empty(&sta->ps_tx_buf);
936
937 if (skb) {
938 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
939 struct ieee80211_hdr *hdr =
940 (struct ieee80211_hdr *) skb->data;
941
942 /*
943 * Tell TX path to send this frame even though the STA may
944 * still remain is PS mode after this frame exchange.
945 */
946 info->flags |= IEEE80211_TX_CTL_PSPOLL_RESPONSE;
947
948#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
949 printk(KERN_DEBUG "STA %pM aid %d: PS Poll (entries after %d)\n",
950 sta->sta.addr, sta->sta.aid,
951 skb_queue_len(&sta->ps_tx_buf));
952#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
953
954 /* Use MoreData flag to indicate whether there are more
955 * buffered frames for this STA */
956 if (no_pending_pkts)
957 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
958 else
959 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
960
961 ieee80211_add_pending_skb(local, skb);
962
963 if (no_pending_pkts)
964 sta_info_clear_tim_bit(sta);
965#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
966 } else {
967 /*
968 * FIXME: This can be the result of a race condition between
969 * us expiring a frame and the station polling for it.
970 * Should we send it a null-func frame indicating we
971 * have nothing buffered for it?
972 */
973 printk(KERN_DEBUG "%s: STA %pM sent PS Poll even "
974 "though there are no buffered frames for it\n",
Johannes Berg47846c92009-11-25 17:46:19 +0100975 sdata->name, sta->sta.addr);
Johannes Bergaf818582009-11-06 11:35:50 +0100976#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
977 }
978}
979
980void ieee80211_sta_block_awake(struct ieee80211_hw *hw,
981 struct ieee80211_sta *pubsta, bool block)
982{
983 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
984
Johannes Bergb5878a22010-04-07 16:48:40 +0200985 trace_api_sta_block_awake(sta->local, pubsta, block);
986
Johannes Bergaf818582009-11-06 11:35:50 +0100987 if (block)
988 set_sta_flags(sta, WLAN_STA_PS_DRIVER);
Johannes Berg50a94322010-11-16 11:50:28 -0800989 else if (test_sta_flags(sta, WLAN_STA_PS_DRIVER))
Johannes Bergaf818582009-11-06 11:35:50 +0100990 ieee80211_queue_work(hw, &sta->drv_unblock_wk);
991}
992EXPORT_SYMBOL(ieee80211_sta_block_awake);