blob: 6d8f897d87636c8422b23ec9447c27dbb0937096 [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);
202 else if (test_and_clear_sta_flags(sta, WLAN_STA_PSPOLL))
203 ieee80211_sta_ps_deliver_poll_response(sta);
204}
205
Johannes Bergaf65cd962009-11-17 18:18:36 +0100206static int sta_prepare_rate_control(struct ieee80211_local *local,
207 struct sta_info *sta, gfp_t gfp)
208{
209 if (local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)
210 return 0;
211
212 sta->rate_ctrl = rate_control_get(local->rate_ctrl);
213 sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl,
214 &sta->sta, gfp);
215 if (!sta->rate_ctrl_priv) {
216 rate_control_put(sta->rate_ctrl);
217 return -ENOMEM;
218 }
219
220 return 0;
221}
222
Johannes Berg73651ee2008-02-25 16:27:47 +0100223struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
224 u8 *addr, gfp_t gfp)
Jiri Bencf0706e82007-05-05 11:45:53 -0700225{
Johannes Bergd0709a62008-02-25 16:27:46 +0100226 struct ieee80211_local *local = sdata->local;
Jiri Bencf0706e82007-05-05 11:45:53 -0700227 struct sta_info *sta;
Ron Rindjunsky16c5f152007-12-25 17:00:34 +0200228 int i;
Jiri Bencf0706e82007-05-05 11:45:53 -0700229
Johannes Berg17741cd2008-09-11 00:02:02 +0200230 sta = kzalloc(sizeof(*sta) + local->hw.sta_data_size, gfp);
Jiri Bencf0706e82007-05-05 11:45:53 -0700231 if (!sta)
Johannes Berg73651ee2008-02-25 16:27:47 +0100232 return NULL;
Jiri Bencf0706e82007-05-05 11:45:53 -0700233
Johannes Berg07346f812008-05-03 01:02:02 +0200234 spin_lock_init(&sta->lock);
Johannes Berg5a9f7b02008-06-18 14:58:09 +0200235 spin_lock_init(&sta->flaglock);
Johannes Bergaf818582009-11-06 11:35:50 +0100236 INIT_WORK(&sta->drv_unblock_wk, sta_unblock);
Johannes Berg67c282c2010-06-10 10:21:43 +0200237 INIT_WORK(&sta->ampdu_mlme.work, ieee80211_ba_session_work);
Johannes Berga93e3642010-06-10 10:21:46 +0200238 mutex_init(&sta->ampdu_mlme.mtx);
Johannes Berg07346f812008-05-03 01:02:02 +0200239
Johannes Berg17741cd2008-09-11 00:02:02 +0200240 memcpy(sta->sta.addr, addr, ETH_ALEN);
Johannes Bergd0709a62008-02-25 16:27:46 +0100241 sta->local = local;
242 sta->sdata = sdata;
Jiri Bencf0706e82007-05-05 11:45:53 -0700243
Johannes Bergaf65cd962009-11-17 18:18:36 +0100244 if (sta_prepare_rate_control(local, sta, gfp)) {
Jiri Bencf0706e82007-05-05 11:45:53 -0700245 kfree(sta);
Johannes Berg73651ee2008-02-25 16:27:47 +0100246 return NULL;
Jiri Bencf0706e82007-05-05 11:45:53 -0700247 }
248
Ron Rindjunsky16c5f152007-12-25 17:00:34 +0200249 for (i = 0; i < STA_TID_NUM; i++) {
Johannes Berga622ab72010-06-10 10:21:39 +0200250 /*
251 * timer_to_tid must be initialized with identity mapping
252 * to enable session_timer's data differentiation. See
253 * sta_rx_agg_session_timer_expired for usage.
254 */
Ron Rindjunsky16c5f152007-12-25 17:00:34 +0200255 sta->timer_to_tid[i] = i;
Ron Rindjunsky16c5f152007-12-25 17:00:34 +0200256 }
Jiri Bencf0706e82007-05-05 11:45:53 -0700257 skb_queue_head_init(&sta->ps_tx_buf);
258 skb_queue_head_init(&sta->tx_filtered);
Johannes Berg73651ee2008-02-25 16:27:47 +0100259
Senthil Balasubramaniancccaec92009-05-14 18:42:08 +0530260 for (i = 0; i < NUM_RX_DATA_QUEUES; i++)
Alexey Dobriyan4be929b2010-05-24 14:33:03 -0700261 sta->last_seq_ctrl[i] = cpu_to_le16(USHRT_MAX);
Senthil Balasubramaniancccaec92009-05-14 18:42:08 +0530262
Johannes Berg73651ee2008-02-25 16:27:47 +0100263#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
Joe Perches0fb9a9e2010-08-20 16:25:38 -0700264 wiphy_debug(local->hw.wiphy, "Allocated STA %pM\n", sta->sta.addr);
Johannes Berg73651ee2008-02-25 16:27:47 +0100265#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
266
Johannes Berg03e44972008-02-27 09:56:40 +0100267#ifdef CONFIG_MAC80211_MESH
Luis Carlos Cobob4e08ea2008-02-29 15:46:08 -0800268 sta->plink_state = PLINK_LISTEN;
Johannes Berg03e44972008-02-27 09:56:40 +0100269 init_timer(&sta->plink_timer);
270#endif
271
Johannes Berg73651ee2008-02-25 16:27:47 +0100272 return sta;
273}
274
Johannes Berg34e89502010-02-03 13:59:58 +0100275static int sta_info_finish_insert(struct sta_info *sta, bool async)
Johannes Berg73651ee2008-02-25 16:27:47 +0100276{
277 struct ieee80211_local *local = sta->local;
278 struct ieee80211_sub_if_data *sdata = sta->sdata;
Johannes Berg98b62182009-12-23 13:15:44 +0100279 struct station_info sinfo;
Johannes Berg73651ee2008-02-25 16:27:47 +0100280 unsigned long flags;
Johannes Berg93e5deb2008-04-01 15:21:00 +0200281 int err = 0;
Johannes Berg73651ee2008-02-25 16:27:47 +0100282
Johannes Berg46a5eba2010-09-15 13:28:15 +0200283 lockdep_assert_held(&local->sta_mtx);
Johannes Berg34e89502010-02-03 13:59:58 +0100284
285 /* notify driver */
286 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
287 sdata = container_of(sdata->bss,
288 struct ieee80211_sub_if_data,
289 u.ap);
290 err = drv_sta_add(local, sdata, &sta->sta);
291 if (err) {
292 if (!async)
293 return err;
294 printk(KERN_DEBUG "%s: failed to add IBSS STA %pM to driver (%d)"
295 " - keeping it anyway.\n",
296 sdata->name, sta->sta.addr, err);
297 } else {
298 sta->uploaded = true;
299#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
300 if (async)
Joe Perches0fb9a9e2010-08-20 16:25:38 -0700301 wiphy_debug(local->hw.wiphy,
302 "Finished adding IBSS STA %pM\n",
303 sta->sta.addr);
Johannes Berg34e89502010-02-03 13:59:58 +0100304#endif
305 }
306
307 sdata = sta->sdata;
308
309 if (!async) {
310 local->num_sta++;
311 local->sta_generation++;
312 smp_mb();
313
314 /* make the station visible */
315 spin_lock_irqsave(&local->sta_lock, flags);
316 sta_info_hash_add(local, sta);
317 spin_unlock_irqrestore(&local->sta_lock, flags);
318 }
319
320 list_add(&sta->list, &local->sta_list);
321
322 ieee80211_sta_debugfs_add(sta);
323 rate_control_add_sta_debugfs(sta);
324
325 sinfo.filled = 0;
326 sinfo.generation = local->sta_generation;
327 cfg80211_new_sta(sdata->dev, sta->sta.addr, &sinfo, GFP_KERNEL);
328
329
330 return 0;
331}
332
333static void sta_info_finish_pending(struct ieee80211_local *local)
334{
335 struct sta_info *sta;
336 unsigned long flags;
337
338 spin_lock_irqsave(&local->sta_lock, flags);
339 while (!list_empty(&local->sta_pending_list)) {
340 sta = list_first_entry(&local->sta_pending_list,
341 struct sta_info, list);
342 list_del(&sta->list);
343 spin_unlock_irqrestore(&local->sta_lock, flags);
344
345 sta_info_finish_insert(sta, true);
346
347 spin_lock_irqsave(&local->sta_lock, flags);
348 }
349 spin_unlock_irqrestore(&local->sta_lock, flags);
350}
351
352static void sta_info_finish_work(struct work_struct *work)
353{
354 struct ieee80211_local *local =
355 container_of(work, struct ieee80211_local, sta_finish_work);
356
357 mutex_lock(&local->sta_mtx);
358 sta_info_finish_pending(local);
359 mutex_unlock(&local->sta_mtx);
360}
361
362int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU)
363{
364 struct ieee80211_local *local = sta->local;
365 struct ieee80211_sub_if_data *sdata = sta->sdata;
366 unsigned long flags;
367 int err = 0;
368
Johannes Berg03e44972008-02-27 09:56:40 +0100369 /*
370 * Can't be a WARN_ON because it can be triggered through a race:
371 * something inserts a STA (on one CPU) without holding the RTNL
372 * and another CPU turns off the net device.
373 */
Johannes Berg9607e6b2009-12-23 13:15:31 +0100374 if (unlikely(!ieee80211_sdata_running(sdata))) {
Johannes Berg93e5deb2008-04-01 15:21:00 +0200375 err = -ENETDOWN;
Johannes Berg34e89502010-02-03 13:59:58 +0100376 rcu_read_lock();
Johannes Berg93e5deb2008-04-01 15:21:00 +0200377 goto out_free;
378 }
Johannes Berg03e44972008-02-27 09:56:40 +0100379
Johannes Berg47846c92009-11-25 17:46:19 +0100380 if (WARN_ON(compare_ether_addr(sta->sta.addr, sdata->vif.addr) == 0 ||
Johannes Bergc6a1fa12008-10-07 12:04:32 +0200381 is_multicast_ether_addr(sta->sta.addr))) {
Johannes Berg93e5deb2008-04-01 15:21:00 +0200382 err = -EINVAL;
Johannes Berg34e89502010-02-03 13:59:58 +0100383 rcu_read_lock();
Johannes Berg93e5deb2008-04-01 15:21:00 +0200384 goto out_free;
385 }
Johannes Berg44213b52008-02-25 16:27:49 +0100386
Johannes Berg34e89502010-02-03 13:59:58 +0100387 /*
388 * In ad-hoc mode, we sometimes need to insert stations
389 * from tasklet context from the RX path. To avoid races,
390 * always do so in that case -- see the comment below.
391 */
392 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
393 spin_lock_irqsave(&local->sta_lock, flags);
394 /* check if STA exists already */
395 if (sta_info_get_bss(sdata, sta->sta.addr)) {
396 spin_unlock_irqrestore(&local->sta_lock, flags);
397 rcu_read_lock();
398 err = -EEXIST;
399 goto out_free;
400 }
401
402 local->num_sta++;
403 local->sta_generation++;
404 smp_mb();
405 sta_info_hash_add(local, sta);
406
407 list_add_tail(&sta->list, &local->sta_pending_list);
408
409 rcu_read_lock();
410 spin_unlock_irqrestore(&local->sta_lock, flags);
411
412#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
Joe Perches0fb9a9e2010-08-20 16:25:38 -0700413 wiphy_debug(local->hw.wiphy, "Added IBSS STA %pM\n",
414 sta->sta.addr);
Johannes Berg34e89502010-02-03 13:59:58 +0100415#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
416
417 ieee80211_queue_work(&local->hw, &local->sta_finish_work);
418
419 return 0;
420 }
421
422 /*
423 * On first glance, this will look racy, because the code
424 * below this point, which inserts a station with sleeping,
425 * unlocks the sta_lock between checking existence in the
426 * hash table and inserting into it.
427 *
428 * However, it is not racy against itself because it keeps
429 * the mutex locked. It still seems to race against the
430 * above code that atomically inserts the station... That,
431 * however, is not true because the above code can only
432 * be invoked for IBSS interfaces, and the below code will
433 * not be -- and the two do not race against each other as
434 * the hash table also keys off the interface.
435 */
436
437 might_sleep();
438
439 mutex_lock(&local->sta_mtx);
440
Johannes Bergd0709a62008-02-25 16:27:46 +0100441 spin_lock_irqsave(&local->sta_lock, flags);
Johannes Berg43ba7e92008-02-21 14:09:30 +0100442 /* check if STA exists already */
Johannes Berg34e89502010-02-03 13:59:58 +0100443 if (sta_info_get_bss(sdata, sta->sta.addr)) {
Johannes Bergd0709a62008-02-25 16:27:46 +0100444 spin_unlock_irqrestore(&local->sta_lock, flags);
Jouni Malinen38a679a2010-03-06 18:35:08 +0200445 mutex_unlock(&local->sta_mtx);
Johannes Berg34e89502010-02-03 13:59:58 +0100446 rcu_read_lock();
Johannes Berg93e5deb2008-04-01 15:21:00 +0200447 err = -EEXIST;
448 goto out_free;
Johannes Berg43ba7e92008-02-21 14:09:30 +0100449 }
Johannes Berg32bfd352007-12-19 01:31:26 +0100450
Johannes Berg34e89502010-02-03 13:59:58 +0100451 spin_unlock_irqrestore(&local->sta_lock, flags);
Johannes Berg32bfd352007-12-19 01:31:26 +0100452
Johannes Berg34e89502010-02-03 13:59:58 +0100453 err = sta_info_finish_insert(sta, false);
454 if (err) {
455 mutex_unlock(&local->sta_mtx);
456 rcu_read_lock();
457 goto out_free;
Johannes Berg32bfd352007-12-19 01:31:26 +0100458 }
Johannes Bergd0709a62008-02-25 16:27:46 +0100459
Jiri Bencf0706e82007-05-05 11:45:53 -0700460#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
Joe Perches0fb9a9e2010-08-20 16:25:38 -0700461 wiphy_debug(local->hw.wiphy, "Inserted STA %pM\n", sta->sta.addr);
Jiri Bencf0706e82007-05-05 11:45:53 -0700462#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
463
Johannes Berg34e89502010-02-03 13:59:58 +0100464 /* move reference to rcu-protected */
465 rcu_read_lock();
466 mutex_unlock(&local->sta_mtx);
Jiri Bence9f207f2007-05-05 11:46:38 -0700467
Johannes Berg73651ee2008-02-25 16:27:47 +0100468 if (ieee80211_vif_is_mesh(&sdata->vif))
469 mesh_accept_plinks_update(sdata);
470
471 return 0;
Johannes Berg93e5deb2008-04-01 15:21:00 +0200472 out_free:
473 BUG_ON(!err);
474 __sta_info_free(local, sta);
475 return err;
Jiri Bencf0706e82007-05-05 11:45:53 -0700476}
477
Johannes Berg34e89502010-02-03 13:59:58 +0100478int sta_info_insert(struct sta_info *sta)
479{
480 int err = sta_info_insert_rcu(sta);
481
482 rcu_read_unlock();
483
484 return err;
485}
486
Johannes Berg004c8722008-02-20 11:21:35 +0100487static inline void __bss_tim_set(struct ieee80211_if_ap *bss, u16 aid)
488{
489 /*
490 * This format has been mandated by the IEEE specifications,
491 * so this line may not be changed to use the __set_bit() format.
492 */
493 bss->tim[aid / 8] |= (1 << (aid % 8));
494}
495
496static inline void __bss_tim_clear(struct ieee80211_if_ap *bss, u16 aid)
497{
498 /*
499 * This format has been mandated by the IEEE specifications,
500 * so this line may not be changed to use the __clear_bit() format.
501 */
502 bss->tim[aid / 8] &= ~(1 << (aid % 8));
503}
504
505static void __sta_info_set_tim_bit(struct ieee80211_if_ap *bss,
506 struct sta_info *sta)
507{
Johannes Berg3e122be2008-07-09 14:40:34 +0200508 BUG_ON(!bss);
509
Johannes Berg17741cd2008-09-11 00:02:02 +0200510 __bss_tim_set(bss, sta->sta.aid);
Johannes Berg3e122be2008-07-09 14:40:34 +0200511
Johannes Bergd0709a62008-02-25 16:27:46 +0100512 if (sta->local->ops->set_tim) {
513 sta->local->tim_in_locked_section = true;
Johannes Berg24487982009-04-23 18:52:52 +0200514 drv_set_tim(sta->local, &sta->sta, true);
Johannes Bergd0709a62008-02-25 16:27:46 +0100515 sta->local->tim_in_locked_section = false;
516 }
Johannes Berg004c8722008-02-20 11:21:35 +0100517}
518
519void sta_info_set_tim_bit(struct sta_info *sta)
520{
Johannes Bergd0709a62008-02-25 16:27:46 +0100521 unsigned long flags;
Johannes Berg004c8722008-02-20 11:21:35 +0100522
Johannes Berg3e122be2008-07-09 14:40:34 +0200523 BUG_ON(!sta->sdata->bss);
524
Johannes Bergd0709a62008-02-25 16:27:46 +0100525 spin_lock_irqsave(&sta->local->sta_lock, flags);
526 __sta_info_set_tim_bit(sta->sdata->bss, sta);
527 spin_unlock_irqrestore(&sta->local->sta_lock, flags);
Johannes Berg004c8722008-02-20 11:21:35 +0100528}
529
530static void __sta_info_clear_tim_bit(struct ieee80211_if_ap *bss,
531 struct sta_info *sta)
532{
Johannes Berg3e122be2008-07-09 14:40:34 +0200533 BUG_ON(!bss);
534
Johannes Berg17741cd2008-09-11 00:02:02 +0200535 __bss_tim_clear(bss, sta->sta.aid);
Johannes Berg3e122be2008-07-09 14:40:34 +0200536
Johannes Bergd0709a62008-02-25 16:27:46 +0100537 if (sta->local->ops->set_tim) {
538 sta->local->tim_in_locked_section = true;
Johannes Berg24487982009-04-23 18:52:52 +0200539 drv_set_tim(sta->local, &sta->sta, false);
Johannes Bergd0709a62008-02-25 16:27:46 +0100540 sta->local->tim_in_locked_section = false;
541 }
Johannes Berg004c8722008-02-20 11:21:35 +0100542}
543
544void sta_info_clear_tim_bit(struct sta_info *sta)
545{
Johannes Bergd0709a62008-02-25 16:27:46 +0100546 unsigned long flags;
Johannes Berg004c8722008-02-20 11:21:35 +0100547
Johannes Berg3e122be2008-07-09 14:40:34 +0200548 BUG_ON(!sta->sdata->bss);
549
Johannes Bergd0709a62008-02-25 16:27:46 +0100550 spin_lock_irqsave(&sta->local->sta_lock, flags);
551 __sta_info_clear_tim_bit(sta->sdata->bss, sta);
552 spin_unlock_irqrestore(&sta->local->sta_lock, flags);
Johannes Berg004c8722008-02-20 11:21:35 +0100553}
554
Johannes Berg57c4d7b2009-04-23 16:10:04 +0200555static int sta_info_buffer_expired(struct sta_info *sta,
556 struct sk_buff *skb)
Jiri Bencf0706e82007-05-05 11:45:53 -0700557{
Johannes Berge039fa42008-05-15 12:55:29 +0200558 struct ieee80211_tx_info *info;
Jiri Bencf0706e82007-05-05 11:45:53 -0700559 int timeout;
560
561 if (!skb)
562 return 0;
563
Johannes Berge039fa42008-05-15 12:55:29 +0200564 info = IEEE80211_SKB_CB(skb);
Jiri Bencf0706e82007-05-05 11:45:53 -0700565
566 /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
Johannes Berg57c4d7b2009-04-23 16:10:04 +0200567 timeout = (sta->listen_interval *
568 sta->sdata->vif.bss_conf.beacon_int *
569 32 / 15625) * HZ;
Jiri Bencf0706e82007-05-05 11:45:53 -0700570 if (timeout < STA_TX_BUFFER_EXPIRE)
571 timeout = STA_TX_BUFFER_EXPIRE;
Johannes Berge039fa42008-05-15 12:55:29 +0200572 return time_after(jiffies, info->control.jiffies + timeout);
Jiri Bencf0706e82007-05-05 11:45:53 -0700573}
574
575
Juuso Oikarinen3393a602010-04-19 10:12:52 +0300576static bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
Jiri Bencf0706e82007-05-05 11:45:53 -0700577 struct sta_info *sta)
578{
579 unsigned long flags;
580 struct sk_buff *skb;
Johannes Berg836341a2008-02-20 02:07:21 +0100581 struct ieee80211_sub_if_data *sdata;
Jiri Bencf0706e82007-05-05 11:45:53 -0700582
583 if (skb_queue_empty(&sta->ps_tx_buf))
Juuso Oikarinen3393a602010-04-19 10:12:52 +0300584 return false;
Jiri Bencf0706e82007-05-05 11:45:53 -0700585
586 for (;;) {
587 spin_lock_irqsave(&sta->ps_tx_buf.lock, flags);
588 skb = skb_peek(&sta->ps_tx_buf);
Johannes Berg57c4d7b2009-04-23 16:10:04 +0200589 if (sta_info_buffer_expired(sta, skb))
Jiri Bencf0706e82007-05-05 11:45:53 -0700590 skb = __skb_dequeue(&sta->ps_tx_buf);
Johannes Berg836341a2008-02-20 02:07:21 +0100591 else
Jiri Bencf0706e82007-05-05 11:45:53 -0700592 skb = NULL;
593 spin_unlock_irqrestore(&sta->ps_tx_buf.lock, flags);
594
Johannes Berg836341a2008-02-20 02:07:21 +0100595 if (!skb)
Jiri Bencf0706e82007-05-05 11:45:53 -0700596 break;
Johannes Berg836341a2008-02-20 02:07:21 +0100597
Johannes Bergd0709a62008-02-25 16:27:46 +0100598 sdata = sta->sdata;
Johannes Berg836341a2008-02-20 02:07:21 +0100599 local->total_ps_buffered--;
Johannes Bergf4ea83d2008-06-30 15:10:46 +0200600#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
Johannes Berg0c68ae262008-10-27 15:56:10 -0700601 printk(KERN_DEBUG "Buffered frame expired (STA %pM)\n",
602 sta->sta.addr);
Johannes Bergf4ea83d2008-06-30 15:10:46 +0200603#endif
Johannes Berg836341a2008-02-20 02:07:21 +0100604 dev_kfree_skb(skb);
605
Johannes Berg004c8722008-02-20 11:21:35 +0100606 if (skb_queue_empty(&sta->ps_tx_buf))
607 sta_info_clear_tim_bit(sta);
Jiri Bencf0706e82007-05-05 11:45:53 -0700608 }
Juuso Oikarinen3393a602010-04-19 10:12:52 +0300609
610 return true;
Jiri Bencf0706e82007-05-05 11:45:53 -0700611}
612
Johannes Berg34e89502010-02-03 13:59:58 +0100613static int __must_check __sta_info_destroy(struct sta_info *sta)
614{
615 struct ieee80211_local *local;
616 struct ieee80211_sub_if_data *sdata;
617 struct sk_buff *skb;
618 unsigned long flags;
Johannes Berge31b8212010-10-05 19:39:30 +0200619 int ret, i;
Johannes Berg34e89502010-02-03 13:59:58 +0100620
621 might_sleep();
622
623 if (!sta)
624 return -ENOENT;
625
626 local = sta->local;
627 sdata = sta->sdata;
628
Johannes Berg098a6072010-04-06 11:18:47 +0200629 /*
630 * Before removing the station from the driver and
631 * rate control, it might still start new aggregation
632 * sessions -- block that to make sure the tear-down
633 * will be sufficient.
634 */
635 set_sta_flags(sta, WLAN_STA_BLOCK_BA);
Johannes Berg53f73c02010-10-05 19:37:40 +0200636 ieee80211_sta_tear_down_BA_sessions(sta, true);
Johannes Berg098a6072010-04-06 11:18:47 +0200637
Johannes Berg34e89502010-02-03 13:59:58 +0100638 spin_lock_irqsave(&local->sta_lock, flags);
639 ret = sta_info_hash_del(local, sta);
640 /* this might still be the pending list ... which is fine */
641 if (!ret)
642 list_del(&sta->list);
643 spin_unlock_irqrestore(&local->sta_lock, flags);
644 if (ret)
645 return ret;
646
Johannes Berge31b8212010-10-05 19:39:30 +0200647 for (i = 0; i < NUM_DEFAULT_KEYS; i++)
648 ieee80211_key_free(local, sta->gtk[i]);
649 if (sta->ptk)
650 ieee80211_key_free(local, sta->ptk);
Johannes Berg34e89502010-02-03 13:59:58 +0100651
652 sta->dead = true;
653
654 if (test_and_clear_sta_flags(sta,
655 WLAN_STA_PS_STA | WLAN_STA_PS_DRIVER)) {
656 BUG_ON(!sdata->bss);
657
658 atomic_dec(&sdata->bss->num_sta_ps);
659 __sta_info_clear_tim_bit(sdata->bss, sta);
660 }
661
662 local->num_sta--;
663 local->sta_generation++;
664
665 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
666 rcu_assign_pointer(sdata->u.vlan.sta, NULL);
667
668 if (sta->uploaded) {
669 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
670 sdata = container_of(sdata->bss,
671 struct ieee80211_sub_if_data,
672 u.ap);
673 drv_sta_remove(local, sdata, &sta->sta);
674 sdata = sta->sdata;
675 }
676
Johannes Berge64b3792010-04-06 11:18:43 +0200677 /*
678 * At this point, after we wait for an RCU grace period,
679 * neither mac80211 nor the driver can reference this
680 * sta struct any more except by still existing timers
681 * associated with this station that we clean up below.
682 */
683 synchronize_rcu();
684
Johannes Berg34e89502010-02-03 13:59:58 +0100685#ifdef CONFIG_MAC80211_MESH
Johannes Berge64b3792010-04-06 11:18:43 +0200686 if (ieee80211_vif_is_mesh(&sdata->vif))
Johannes Berg34e89502010-02-03 13:59:58 +0100687 mesh_accept_plinks_update(sdata);
Johannes Berg34e89502010-02-03 13:59:58 +0100688#endif
689
690#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
Joe Perches0fb9a9e2010-08-20 16:25:38 -0700691 wiphy_debug(local->hw.wiphy, "Removed STA %pM\n", sta->sta.addr);
Johannes Berg34e89502010-02-03 13:59:58 +0100692#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
693 cancel_work_sync(&sta->drv_unblock_wk);
694
695 rate_control_remove_sta_debugfs(sta);
696 ieee80211_sta_debugfs_remove(sta);
697
698#ifdef CONFIG_MAC80211_MESH
699 if (ieee80211_vif_is_mesh(&sta->sdata->vif)) {
700 mesh_plink_deactivate(sta);
701 del_timer_sync(&sta->plink_timer);
702 }
703#endif
704
705 while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
706 local->total_ps_buffered--;
707 dev_kfree_skb_any(skb);
708 }
709
710 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL)
711 dev_kfree_skb_any(skb);
712
Johannes Berg34e89502010-02-03 13:59:58 +0100713 __sta_info_free(local, sta);
714
715 return 0;
716}
717
718int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, const u8 *addr)
719{
720 struct sta_info *sta;
721 int ret;
722
723 mutex_lock(&sdata->local->sta_mtx);
724 sta = sta_info_get(sdata, addr);
725 ret = __sta_info_destroy(sta);
726 mutex_unlock(&sdata->local->sta_mtx);
727
728 return ret;
729}
730
731int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
732 const u8 *addr)
733{
734 struct sta_info *sta;
735 int ret;
736
737 mutex_lock(&sdata->local->sta_mtx);
738 sta = sta_info_get_bss(sdata, addr);
739 ret = __sta_info_destroy(sta);
740 mutex_unlock(&sdata->local->sta_mtx);
741
742 return ret;
743}
Jiri Bencf0706e82007-05-05 11:45:53 -0700744
745static void sta_info_cleanup(unsigned long data)
746{
747 struct ieee80211_local *local = (struct ieee80211_local *) data;
748 struct sta_info *sta;
Juuso Oikarinen3393a602010-04-19 10:12:52 +0300749 bool timer_needed = false;
Jiri Bencf0706e82007-05-05 11:45:53 -0700750
Johannes Bergd0709a62008-02-25 16:27:46 +0100751 rcu_read_lock();
752 list_for_each_entry_rcu(sta, &local->sta_list, list)
Juuso Oikarinen3393a602010-04-19 10:12:52 +0300753 if (sta_info_cleanup_expire_buffered(local, sta))
754 timer_needed = true;
Johannes Bergd0709a62008-02-25 16:27:46 +0100755 rcu_read_unlock();
Jiri Bencf0706e82007-05-05 11:45:53 -0700756
Johannes Berg5bb644a2009-05-17 11:40:42 +0200757 if (local->quiescing)
758 return;
759
Juuso Oikarinen3393a602010-04-19 10:12:52 +0300760 if (!timer_needed)
761 return;
762
Johannes Berg0d174402007-12-17 15:07:43 +0100763 local->sta_cleanup.expires =
764 round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL);
Jiri Bencf0706e82007-05-05 11:45:53 -0700765 add_timer(&local->sta_cleanup);
766}
767
768void sta_info_init(struct ieee80211_local *local)
769{
Johannes Bergd0709a62008-02-25 16:27:46 +0100770 spin_lock_init(&local->sta_lock);
Johannes Berg34e89502010-02-03 13:59:58 +0100771 mutex_init(&local->sta_mtx);
Jiri Bencf0706e82007-05-05 11:45:53 -0700772 INIT_LIST_HEAD(&local->sta_list);
Johannes Berg34e89502010-02-03 13:59:58 +0100773 INIT_LIST_HEAD(&local->sta_pending_list);
774 INIT_WORK(&local->sta_finish_work, sta_info_finish_work);
Jiri Bencf0706e82007-05-05 11:45:53 -0700775
Pavel Emelyanovb24b8a22008-01-23 21:20:07 -0800776 setup_timer(&local->sta_cleanup, sta_info_cleanup,
777 (unsigned long)local);
Johannes Berg0d174402007-12-17 15:07:43 +0100778 local->sta_cleanup.expires =
779 round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL);
Jiri Bencf0706e82007-05-05 11:45:53 -0700780}
781
782int sta_info_start(struct ieee80211_local *local)
783{
784 add_timer(&local->sta_cleanup);
785 return 0;
786}
787
788void sta_info_stop(struct ieee80211_local *local)
789{
Jiri Bencf0706e82007-05-05 11:45:53 -0700790 del_timer(&local->sta_cleanup);
Michael Wube8755e2007-07-27 15:43:23 +0200791 sta_info_flush(local, NULL);
Jiri Bencf0706e82007-05-05 11:45:53 -0700792}
793
Jiri Bencf0706e82007-05-05 11:45:53 -0700794/**
795 * sta_info_flush - flush matching STA entries from the STA table
Johannes Berg44213b52008-02-25 16:27:49 +0100796 *
797 * Returns the number of removed STA entries.
798 *
Jiri Bencf0706e82007-05-05 11:45:53 -0700799 * @local: local interface data
Johannes Bergd0709a62008-02-25 16:27:46 +0100800 * @sdata: matching rule for the net device (sta->dev) or %NULL to match all STAs
Jiri Bencf0706e82007-05-05 11:45:53 -0700801 */
Johannes Berg44213b52008-02-25 16:27:49 +0100802int sta_info_flush(struct ieee80211_local *local,
Johannes Bergaf8cdcd2009-04-19 21:25:43 +0200803 struct ieee80211_sub_if_data *sdata)
Jiri Bencf0706e82007-05-05 11:45:53 -0700804{
805 struct sta_info *sta, *tmp;
Johannes Berg44213b52008-02-25 16:27:49 +0100806 int ret = 0;
Jiri Bencf0706e82007-05-05 11:45:53 -0700807
Johannes Bergd0709a62008-02-25 16:27:46 +0100808 might_sleep();
809
Johannes Berg34e89502010-02-03 13:59:58 +0100810 mutex_lock(&local->sta_mtx);
Johannes Bergd0709a62008-02-25 16:27:46 +0100811
Johannes Berg34e89502010-02-03 13:59:58 +0100812 sta_info_finish_pending(local);
813
814 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
815 if (!sdata || sdata == sta->sdata)
816 WARN_ON(__sta_info_destroy(sta));
817 }
818 mutex_unlock(&local->sta_mtx);
Johannes Berg44213b52008-02-25 16:27:49 +0100819
820 return ret;
Jiri Bencf0706e82007-05-05 11:45:53 -0700821}
Johannes Bergdc6676b2008-03-31 19:23:03 +0200822
Johannes Berg24723d12008-09-11 00:01:46 +0200823void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
824 unsigned long exp_time)
825{
826 struct ieee80211_local *local = sdata->local;
827 struct sta_info *sta, *tmp;
Johannes Berg24723d12008-09-11 00:01:46 +0200828
Johannes Berg34e89502010-02-03 13:59:58 +0100829 mutex_lock(&local->sta_mtx);
Johannes Berg24723d12008-09-11 00:01:46 +0200830 list_for_each_entry_safe(sta, tmp, &local->sta_list, list)
831 if (time_after(jiffies, sta->last_rx + exp_time)) {
832#ifdef CONFIG_MAC80211_IBSS_DEBUG
Johannes Berg0c68ae262008-10-27 15:56:10 -0700833 printk(KERN_DEBUG "%s: expiring inactive STA %pM\n",
Johannes Berg47846c92009-11-25 17:46:19 +0100834 sdata->name, sta->sta.addr);
Johannes Berg24723d12008-09-11 00:01:46 +0200835#endif
Johannes Berg34e89502010-02-03 13:59:58 +0100836 WARN_ON(__sta_info_destroy(sta));
Johannes Berg24723d12008-09-11 00:01:46 +0200837 }
Johannes Berg34e89502010-02-03 13:59:58 +0100838 mutex_unlock(&local->sta_mtx);
Johannes Berg24723d12008-09-11 00:01:46 +0200839}
Johannes Berg17741cd2008-09-11 00:02:02 +0200840
Ben Greear686b9cb2010-09-23 09:44:36 -0700841struct ieee80211_sta *ieee80211_find_sta_by_ifaddr(struct ieee80211_hw *hw,
842 const u8 *addr,
843 const u8 *localaddr)
Johannes Berg17741cd2008-09-11 00:02:02 +0200844{
Johannes Bergabe60632009-11-25 17:46:18 +0100845 struct sta_info *sta, *nxt;
Johannes Berg17741cd2008-09-11 00:02:02 +0200846
Ben Greear686b9cb2010-09-23 09:44:36 -0700847 /*
848 * Just return a random station if localaddr is NULL
849 * ... first in list.
850 */
Johannes Bergf7c65592010-04-30 13:48:36 +0200851 for_each_sta_info(hw_to_local(hw), addr, sta, nxt) {
Ben Greear686b9cb2010-09-23 09:44:36 -0700852 if (localaddr &&
853 compare_ether_addr(sta->sdata->vif.addr, localaddr) != 0)
854 continue;
Johannes Bergf7c65592010-04-30 13:48:36 +0200855 if (!sta->uploaded)
856 return NULL;
Johannes Bergabe60632009-11-25 17:46:18 +0100857 return &sta->sta;
Johannes Bergf7c65592010-04-30 13:48:36 +0200858 }
859
Johannes Bergabe60632009-11-25 17:46:18 +0100860 return NULL;
Johannes Berg17741cd2008-09-11 00:02:02 +0200861}
Ben Greear686b9cb2010-09-23 09:44:36 -0700862EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr);
Johannes Berg5ed176e2009-11-04 14:42:28 +0100863
864struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif,
865 const u8 *addr)
866{
Johannes Bergf7c65592010-04-30 13:48:36 +0200867 struct sta_info *sta;
Johannes Berg5ed176e2009-11-04 14:42:28 +0100868
869 if (!vif)
870 return NULL;
871
Johannes Bergf7c65592010-04-30 13:48:36 +0200872 sta = sta_info_get_bss(vif_to_sdata(vif), addr);
873 if (!sta)
874 return NULL;
Johannes Berg5ed176e2009-11-04 14:42:28 +0100875
Johannes Bergf7c65592010-04-30 13:48:36 +0200876 if (!sta->uploaded)
877 return NULL;
878
879 return &sta->sta;
Johannes Berg5ed176e2009-11-04 14:42:28 +0100880}
Johannes Berg17741cd2008-09-11 00:02:02 +0200881EXPORT_SYMBOL(ieee80211_find_sta);
Johannes Bergaf818582009-11-06 11:35:50 +0100882
883/* powersave support code */
884void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta)
885{
886 struct ieee80211_sub_if_data *sdata = sta->sdata;
887 struct ieee80211_local *local = sdata->local;
888 int sent, buffered;
889
Johannes Berg12375ef2009-11-25 20:30:31 +0100890 drv_sta_notify(local, sdata, STA_NOTIFY_AWAKE, &sta->sta);
Johannes Bergaf818582009-11-06 11:35:50 +0100891
892 if (!skb_queue_empty(&sta->ps_tx_buf))
893 sta_info_clear_tim_bit(sta);
894
895 /* Send all buffered frames to the station */
896 sent = ieee80211_add_pending_skbs(local, &sta->tx_filtered);
897 buffered = ieee80211_add_pending_skbs(local, &sta->ps_tx_buf);
898 sent += buffered;
899 local->total_ps_buffered -= buffered;
900
901#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
902 printk(KERN_DEBUG "%s: STA %pM aid %d sending %d filtered/%d PS frames "
Johannes Berg47846c92009-11-25 17:46:19 +0100903 "since STA not sleeping anymore\n", sdata->name,
Johannes Bergaf818582009-11-06 11:35:50 +0100904 sta->sta.addr, sta->sta.aid, sent - buffered, buffered);
905#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
906}
907
908void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta)
909{
910 struct ieee80211_sub_if_data *sdata = sta->sdata;
911 struct ieee80211_local *local = sdata->local;
912 struct sk_buff *skb;
913 int no_pending_pkts;
914
915 skb = skb_dequeue(&sta->tx_filtered);
916 if (!skb) {
917 skb = skb_dequeue(&sta->ps_tx_buf);
918 if (skb)
919 local->total_ps_buffered--;
920 }
921 no_pending_pkts = skb_queue_empty(&sta->tx_filtered) &&
922 skb_queue_empty(&sta->ps_tx_buf);
923
924 if (skb) {
925 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
926 struct ieee80211_hdr *hdr =
927 (struct ieee80211_hdr *) skb->data;
928
929 /*
930 * Tell TX path to send this frame even though the STA may
931 * still remain is PS mode after this frame exchange.
932 */
933 info->flags |= IEEE80211_TX_CTL_PSPOLL_RESPONSE;
934
935#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
936 printk(KERN_DEBUG "STA %pM aid %d: PS Poll (entries after %d)\n",
937 sta->sta.addr, sta->sta.aid,
938 skb_queue_len(&sta->ps_tx_buf));
939#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
940
941 /* Use MoreData flag to indicate whether there are more
942 * buffered frames for this STA */
943 if (no_pending_pkts)
944 hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
945 else
946 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA);
947
948 ieee80211_add_pending_skb(local, skb);
949
950 if (no_pending_pkts)
951 sta_info_clear_tim_bit(sta);
952#ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG
953 } else {
954 /*
955 * FIXME: This can be the result of a race condition between
956 * us expiring a frame and the station polling for it.
957 * Should we send it a null-func frame indicating we
958 * have nothing buffered for it?
959 */
960 printk(KERN_DEBUG "%s: STA %pM sent PS Poll even "
961 "though there are no buffered frames for it\n",
Johannes Berg47846c92009-11-25 17:46:19 +0100962 sdata->name, sta->sta.addr);
Johannes Bergaf818582009-11-06 11:35:50 +0100963#endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */
964 }
965}
966
967void ieee80211_sta_block_awake(struct ieee80211_hw *hw,
968 struct ieee80211_sta *pubsta, bool block)
969{
970 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
971
Johannes Bergb5878a22010-04-07 16:48:40 +0200972 trace_api_sta_block_awake(sta->local, pubsta, block);
973
Johannes Bergaf818582009-11-06 11:35:50 +0100974 if (block)
975 set_sta_flags(sta, WLAN_STA_PS_DRIVER);
976 else
977 ieee80211_queue_work(hw, &sta->drv_unblock_wk);
978}
979EXPORT_SYMBOL(ieee80211_sta_block_awake);