Merge branch 'for-linus' of git://oss.sgi.com:8090/xfs/xfs-2.6
[deliverable/linux.git] / net / mac80211 / sta_info.c
1 /*
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>
17
18 #include <net/mac80211.h>
19 #include "ieee80211_i.h"
20 #include "ieee80211_rate.h"
21 #include "sta_info.h"
22 #include "debugfs_sta.h"
23
24 /* Caller must hold local->sta_lock */
25 static void sta_info_hash_add(struct ieee80211_local *local,
26 struct sta_info *sta)
27 {
28 sta->hnext = local->sta_hash[STA_HASH(sta->addr)];
29 local->sta_hash[STA_HASH(sta->addr)] = sta;
30 }
31
32
33 /* Caller must hold local->sta_lock */
34 static int sta_info_hash_del(struct ieee80211_local *local,
35 struct sta_info *sta)
36 {
37 struct sta_info *s;
38
39 s = local->sta_hash[STA_HASH(sta->addr)];
40 if (!s)
41 return -ENOENT;
42 if (s == sta) {
43 local->sta_hash[STA_HASH(sta->addr)] = s->hnext;
44 return 0;
45 }
46
47 while (s->hnext && s->hnext != sta)
48 s = s->hnext;
49 if (s->hnext) {
50 s->hnext = sta->hnext;
51 return 0;
52 }
53
54 return -ENOENT;
55 }
56
57 struct sta_info *sta_info_get(struct ieee80211_local *local, u8 *addr)
58 {
59 struct sta_info *sta;
60
61 read_lock_bh(&local->sta_lock);
62 sta = local->sta_hash[STA_HASH(addr)];
63 while (sta) {
64 if (memcmp(sta->addr, addr, ETH_ALEN) == 0) {
65 __sta_info_get(sta);
66 break;
67 }
68 sta = sta->hnext;
69 }
70 read_unlock_bh(&local->sta_lock);
71
72 return sta;
73 }
74 EXPORT_SYMBOL(sta_info_get);
75
76 int sta_info_min_txrate_get(struct ieee80211_local *local)
77 {
78 struct sta_info *sta;
79 struct ieee80211_hw_mode *mode;
80 int min_txrate = 9999999;
81 int i;
82
83 read_lock_bh(&local->sta_lock);
84 mode = local->oper_hw_mode;
85 for (i = 0; i < STA_HASH_SIZE; i++) {
86 sta = local->sta_hash[i];
87 while (sta) {
88 if (sta->txrate < min_txrate)
89 min_txrate = sta->txrate;
90 sta = sta->hnext;
91 }
92 }
93 read_unlock_bh(&local->sta_lock);
94 if (min_txrate == 9999999)
95 min_txrate = 0;
96
97 return mode->rates[min_txrate].rate;
98 }
99
100
101 static void sta_info_release(struct kref *kref)
102 {
103 struct sta_info *sta = container_of(kref, struct sta_info, kref);
104 struct ieee80211_local *local = sta->local;
105 struct sk_buff *skb;
106
107 /* free sta structure; it has already been removed from
108 * hash table etc. external structures. Make sure that all
109 * buffered frames are release (one might have been added
110 * after sta_info_free() was called). */
111 while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
112 local->total_ps_buffered--;
113 dev_kfree_skb_any(skb);
114 }
115 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
116 dev_kfree_skb_any(skb);
117 }
118 rate_control_free_sta(sta->rate_ctrl, sta->rate_ctrl_priv);
119 rate_control_put(sta->rate_ctrl);
120 kfree(sta);
121 }
122
123
124 void sta_info_put(struct sta_info *sta)
125 {
126 kref_put(&sta->kref, sta_info_release);
127 }
128 EXPORT_SYMBOL(sta_info_put);
129
130
131 struct sta_info * sta_info_add(struct ieee80211_local *local,
132 struct net_device *dev, u8 *addr, gfp_t gfp)
133 {
134 struct sta_info *sta;
135 DECLARE_MAC_BUF(mac);
136
137 sta = kzalloc(sizeof(*sta), gfp);
138 if (!sta)
139 return NULL;
140
141 kref_init(&sta->kref);
142
143 sta->rate_ctrl = rate_control_get(local->rate_ctrl);
144 sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl, gfp);
145 if (!sta->rate_ctrl_priv) {
146 rate_control_put(sta->rate_ctrl);
147 kfree(sta);
148 return NULL;
149 }
150
151 memcpy(sta->addr, addr, ETH_ALEN);
152 sta->local = local;
153 sta->dev = dev;
154 skb_queue_head_init(&sta->ps_tx_buf);
155 skb_queue_head_init(&sta->tx_filtered);
156 __sta_info_get(sta); /* sta used by caller, decremented by
157 * sta_info_put() */
158 write_lock_bh(&local->sta_lock);
159 list_add(&sta->list, &local->sta_list);
160 local->num_sta++;
161 sta_info_hash_add(local, sta);
162 if (local->ops->sta_notify)
163 local->ops->sta_notify(local_to_hw(local), dev->ifindex,
164 STA_NOTIFY_ADD, addr);
165 write_unlock_bh(&local->sta_lock);
166
167 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
168 printk(KERN_DEBUG "%s: Added STA %s\n",
169 wiphy_name(local->hw.wiphy), print_mac(mac, addr));
170 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
171
172 #ifdef CONFIG_MAC80211_DEBUGFS
173 /* debugfs entry adding might sleep, so schedule process
174 * context task for adding entry for STAs that do not yet
175 * have one. */
176 queue_work(local->hw.workqueue, &local->sta_debugfs_add);
177 #endif
178
179 return sta;
180 }
181
182 /* Caller must hold local->sta_lock */
183 void sta_info_remove(struct sta_info *sta)
184 {
185 struct ieee80211_local *local = sta->local;
186 struct ieee80211_sub_if_data *sdata;
187
188 /* don't do anything if we've been removed already */
189 if (sta_info_hash_del(local, sta))
190 return;
191
192 list_del(&sta->list);
193 sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
194 if (sta->flags & WLAN_STA_PS) {
195 sta->flags &= ~WLAN_STA_PS;
196 if (sdata->bss)
197 atomic_dec(&sdata->bss->num_sta_ps);
198 }
199 local->num_sta--;
200 sta_info_remove_aid_ptr(sta);
201
202 }
203
204 void sta_info_free(struct sta_info *sta)
205 {
206 struct sk_buff *skb;
207 struct ieee80211_local *local = sta->local;
208 DECLARE_MAC_BUF(mac);
209
210 might_sleep();
211
212 write_lock_bh(&local->sta_lock);
213 sta_info_remove(sta);
214 write_unlock_bh(&local->sta_lock);
215
216 while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
217 local->total_ps_buffered--;
218 dev_kfree_skb(skb);
219 }
220 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
221 dev_kfree_skb(skb);
222 }
223
224 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
225 printk(KERN_DEBUG "%s: Removed STA %s\n",
226 wiphy_name(local->hw.wiphy), print_mac(mac, sta->addr));
227 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
228
229 ieee80211_key_free(sta->key);
230 sta->key = NULL;
231
232 if (local->ops->sta_notify)
233 local->ops->sta_notify(local_to_hw(local), sta->dev->ifindex,
234 STA_NOTIFY_REMOVE, sta->addr);
235
236 rate_control_remove_sta_debugfs(sta);
237 ieee80211_sta_debugfs_remove(sta);
238
239 sta_info_put(sta);
240 }
241
242
243 static inline int sta_info_buffer_expired(struct ieee80211_local *local,
244 struct sta_info *sta,
245 struct sk_buff *skb)
246 {
247 struct ieee80211_tx_packet_data *pkt_data;
248 int timeout;
249
250 if (!skb)
251 return 0;
252
253 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
254
255 /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
256 timeout = (sta->listen_interval * local->hw.conf.beacon_int * 32 /
257 15625) * HZ;
258 if (timeout < STA_TX_BUFFER_EXPIRE)
259 timeout = STA_TX_BUFFER_EXPIRE;
260 return time_after(jiffies, pkt_data->jiffies + timeout);
261 }
262
263
264 static void sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
265 struct sta_info *sta)
266 {
267 unsigned long flags;
268 struct sk_buff *skb;
269 DECLARE_MAC_BUF(mac);
270
271 if (skb_queue_empty(&sta->ps_tx_buf))
272 return;
273
274 for (;;) {
275 spin_lock_irqsave(&sta->ps_tx_buf.lock, flags);
276 skb = skb_peek(&sta->ps_tx_buf);
277 if (sta_info_buffer_expired(local, sta, skb)) {
278 skb = __skb_dequeue(&sta->ps_tx_buf);
279 if (skb_queue_empty(&sta->ps_tx_buf))
280 sta->flags &= ~WLAN_STA_TIM;
281 } else
282 skb = NULL;
283 spin_unlock_irqrestore(&sta->ps_tx_buf.lock, flags);
284
285 if (skb) {
286 local->total_ps_buffered--;
287 printk(KERN_DEBUG "Buffered frame expired (STA "
288 "%s)\n", print_mac(mac, sta->addr));
289 dev_kfree_skb(skb);
290 } else
291 break;
292 }
293 }
294
295
296 static void sta_info_cleanup(unsigned long data)
297 {
298 struct ieee80211_local *local = (struct ieee80211_local *) data;
299 struct sta_info *sta;
300
301 read_lock_bh(&local->sta_lock);
302 list_for_each_entry(sta, &local->sta_list, list) {
303 __sta_info_get(sta);
304 sta_info_cleanup_expire_buffered(local, sta);
305 sta_info_put(sta);
306 }
307 read_unlock_bh(&local->sta_lock);
308
309 local->sta_cleanup.expires = jiffies + STA_INFO_CLEANUP_INTERVAL;
310 add_timer(&local->sta_cleanup);
311 }
312
313 #ifdef CONFIG_MAC80211_DEBUGFS
314 static void sta_info_debugfs_add_task(struct work_struct *work)
315 {
316 struct ieee80211_local *local =
317 container_of(work, struct ieee80211_local, sta_debugfs_add);
318 struct sta_info *sta, *tmp;
319
320 while (1) {
321 sta = NULL;
322 read_lock_bh(&local->sta_lock);
323 list_for_each_entry(tmp, &local->sta_list, list) {
324 if (!tmp->debugfs.dir) {
325 sta = tmp;
326 __sta_info_get(sta);
327 break;
328 }
329 }
330 read_unlock_bh(&local->sta_lock);
331
332 if (!sta)
333 break;
334
335 ieee80211_sta_debugfs_add(sta);
336 rate_control_add_sta_debugfs(sta);
337 sta_info_put(sta);
338 }
339 }
340 #endif
341
342 void sta_info_init(struct ieee80211_local *local)
343 {
344 rwlock_init(&local->sta_lock);
345 INIT_LIST_HEAD(&local->sta_list);
346
347 init_timer(&local->sta_cleanup);
348 local->sta_cleanup.expires = jiffies + STA_INFO_CLEANUP_INTERVAL;
349 local->sta_cleanup.data = (unsigned long) local;
350 local->sta_cleanup.function = sta_info_cleanup;
351
352 #ifdef CONFIG_MAC80211_DEBUGFS
353 INIT_WORK(&local->sta_debugfs_add, sta_info_debugfs_add_task);
354 #endif
355 }
356
357 int sta_info_start(struct ieee80211_local *local)
358 {
359 add_timer(&local->sta_cleanup);
360 return 0;
361 }
362
363 void sta_info_stop(struct ieee80211_local *local)
364 {
365 del_timer(&local->sta_cleanup);
366 sta_info_flush(local, NULL);
367 }
368
369 void sta_info_remove_aid_ptr(struct sta_info *sta)
370 {
371 struct ieee80211_sub_if_data *sdata;
372
373 if (sta->aid <= 0)
374 return;
375
376 sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
377
378 if (sdata->local->ops->set_tim)
379 sdata->local->ops->set_tim(local_to_hw(sdata->local),
380 sta->aid, 0);
381 if (sdata->bss)
382 __bss_tim_clear(sdata->bss, sta->aid);
383 }
384
385
386 /**
387 * sta_info_flush - flush matching STA entries from the STA table
388 * @local: local interface data
389 * @dev: matching rule for the net device (sta->dev) or %NULL to match all STAs
390 */
391 void sta_info_flush(struct ieee80211_local *local, struct net_device *dev)
392 {
393 struct sta_info *sta, *tmp;
394 LIST_HEAD(tmp_list);
395
396 write_lock_bh(&local->sta_lock);
397 list_for_each_entry_safe(sta, tmp, &local->sta_list, list)
398 if (!dev || dev == sta->dev) {
399 __sta_info_get(sta);
400 sta_info_remove(sta);
401 list_add_tail(&sta->list, &tmp_list);
402 }
403 write_unlock_bh(&local->sta_lock);
404
405 list_for_each_entry_safe(sta, tmp, &tmp_list, list) {
406 sta_info_free(sta);
407 sta_info_put(sta);
408 }
409 }
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