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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>
17
18#include <net/mac80211.h>
19#include "ieee80211_i.h"
20#include "ieee80211_rate.h"
21#include "sta_info.h"
Jiri Bence9f207f2007-05-05 11:46:38 -070022#include "debugfs_key.h"
23#include "debugfs_sta.h"
Jiri Bencf0706e82007-05-05 11:45:53 -070024
25/* Caller must hold local->sta_lock */
26static void sta_info_hash_add(struct ieee80211_local *local,
27 struct sta_info *sta)
28{
29 sta->hnext = local->sta_hash[STA_HASH(sta->addr)];
30 local->sta_hash[STA_HASH(sta->addr)] = sta;
31}
32
33
34/* Caller must hold local->sta_lock */
35static void sta_info_hash_del(struct ieee80211_local *local,
36 struct sta_info *sta)
37{
38 struct sta_info *s;
39
40 s = local->sta_hash[STA_HASH(sta->addr)];
41 if (!s)
42 return;
43 if (memcmp(s->addr, sta->addr, ETH_ALEN) == 0) {
44 local->sta_hash[STA_HASH(sta->addr)] = s->hnext;
45 return;
46 }
47
48 while (s->hnext && memcmp(s->hnext->addr, sta->addr, ETH_ALEN) != 0)
49 s = s->hnext;
50 if (s->hnext)
51 s->hnext = s->hnext->hnext;
52 else
53 printk(KERN_ERR "%s: could not remove STA " MAC_FMT " from "
54 "hash table\n", local->mdev->name, MAC_ARG(sta->addr));
55}
56
57static inline void __sta_info_get(struct sta_info *sta)
58{
59 kref_get(&sta->kref);
60}
61
62struct sta_info *sta_info_get(struct ieee80211_local *local, u8 *addr)
63{
64 struct sta_info *sta;
65
66 spin_lock_bh(&local->sta_lock);
67 sta = local->sta_hash[STA_HASH(addr)];
68 while (sta) {
69 if (memcmp(sta->addr, addr, ETH_ALEN) == 0) {
70 __sta_info_get(sta);
71 break;
72 }
73 sta = sta->hnext;
74 }
75 spin_unlock_bh(&local->sta_lock);
76
77 return sta;
78}
79EXPORT_SYMBOL(sta_info_get);
80
81int sta_info_min_txrate_get(struct ieee80211_local *local)
82{
83 struct sta_info *sta;
84 struct ieee80211_hw_mode *mode;
85 int min_txrate = 9999999;
86 int i;
87
88 spin_lock_bh(&local->sta_lock);
89 mode = local->oper_hw_mode;
90 for (i = 0; i < STA_HASH_SIZE; i++) {
91 sta = local->sta_hash[i];
92 while (sta) {
93 if (sta->txrate < min_txrate)
94 min_txrate = sta->txrate;
95 sta = sta->hnext;
96 }
97 }
98 spin_unlock_bh(&local->sta_lock);
99 if (min_txrate == 9999999)
100 min_txrate = 0;
101
102 return mode->rates[min_txrate].rate;
103}
104
105
106static void sta_info_release(struct kref *kref)
107{
108 struct sta_info *sta = container_of(kref, struct sta_info, kref);
109 struct ieee80211_local *local = sta->local;
110 struct sk_buff *skb;
111
112 /* free sta structure; it has already been removed from
113 * hash table etc. external structures. Make sure that all
114 * buffered frames are release (one might have been added
115 * after sta_info_free() was called). */
116 while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
117 local->total_ps_buffered--;
118 dev_kfree_skb_any(skb);
119 }
120 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
121 dev_kfree_skb_any(skb);
122 }
123 rate_control_free_sta(sta->rate_ctrl, sta->rate_ctrl_priv);
124 rate_control_put(sta->rate_ctrl);
Jiri Bence9f207f2007-05-05 11:46:38 -0700125 if (sta->key)
126 ieee80211_debugfs_key_sta_del(sta->key, sta);
Jiri Bencf0706e82007-05-05 11:45:53 -0700127 kfree(sta);
128}
129
130
131void sta_info_put(struct sta_info *sta)
132{
133 kref_put(&sta->kref, sta_info_release);
134}
135EXPORT_SYMBOL(sta_info_put);
136
137
138struct sta_info * sta_info_add(struct ieee80211_local *local,
139 struct net_device *dev, u8 *addr, gfp_t gfp)
140{
141 struct sta_info *sta;
142
143 sta = kzalloc(sizeof(*sta), gfp);
144 if (!sta)
145 return NULL;
146
147 kref_init(&sta->kref);
148
149 sta->rate_ctrl = rate_control_get(local->rate_ctrl);
150 sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl, gfp);
151 if (!sta->rate_ctrl_priv) {
152 rate_control_put(sta->rate_ctrl);
153 kref_put(&sta->kref, sta_info_release);
154 kfree(sta);
155 return NULL;
156 }
157
158 memcpy(sta->addr, addr, ETH_ALEN);
159 sta->local = local;
160 sta->dev = dev;
161 skb_queue_head_init(&sta->ps_tx_buf);
162 skb_queue_head_init(&sta->tx_filtered);
163 __sta_info_get(sta); /* sta used by caller, decremented by
164 * sta_info_put() */
165 spin_lock_bh(&local->sta_lock);
166 list_add(&sta->list, &local->sta_list);
167 local->num_sta++;
168 sta_info_hash_add(local, sta);
169 spin_unlock_bh(&local->sta_lock);
170 if (local->ops->sta_table_notification)
171 local->ops->sta_table_notification(local_to_hw(local),
172 local->num_sta);
173 sta->key_idx_compression = HW_KEY_IDX_INVALID;
174
175#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
176 printk(KERN_DEBUG "%s: Added STA " MAC_FMT "\n",
177 local->mdev->name, MAC_ARG(addr));
178#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
179
Jiri Bence9f207f2007-05-05 11:46:38 -0700180#ifdef CONFIG_MAC80211_DEBUGFS
181 if (!in_interrupt()) {
182 sta->debugfs_registered = 1;
183 ieee80211_sta_debugfs_add(sta);
184 rate_control_add_sta_debugfs(sta);
185 } else {
186 /* debugfs entry adding might sleep, so schedule process
187 * context task for adding entry for STAs that do not yet
188 * have one. */
189 queue_work(local->hw.workqueue, &local->sta_debugfs_add);
190 }
191#endif
192
Jiri Bencf0706e82007-05-05 11:45:53 -0700193 return sta;
194}
195
Jiri Bence9f207f2007-05-05 11:46:38 -0700196static void finish_sta_info_free(struct ieee80211_local *local,
197 struct sta_info *sta)
198{
199#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
200 printk(KERN_DEBUG "%s: Removed STA " MAC_FMT "\n",
201 local->mdev->name, MAC_ARG(sta->addr));
202#endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
203
204 if (sta->key) {
205 ieee80211_debugfs_key_remove(sta->key);
206 ieee80211_key_free(sta->key);
207 sta->key = NULL;
208 }
209
210 rate_control_remove_sta_debugfs(sta);
211 ieee80211_sta_debugfs_remove(sta);
212
213 sta_info_put(sta);
214}
215
Jiri Bencf0706e82007-05-05 11:45:53 -0700216static void sta_info_remove(struct sta_info *sta)
217{
218 struct ieee80211_local *local = sta->local;
219 struct ieee80211_sub_if_data *sdata;
220
221 sta_info_hash_del(local, sta);
222 list_del(&sta->list);
223 sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
224 if (sta->flags & WLAN_STA_PS) {
225 sta->flags &= ~WLAN_STA_PS;
226 if (sdata->bss)
227 atomic_dec(&sdata->bss->num_sta_ps);
228 }
229 local->num_sta--;
230 sta_info_remove_aid_ptr(sta);
231}
232
233void sta_info_free(struct sta_info *sta, int locked)
234{
235 struct sk_buff *skb;
236 struct ieee80211_local *local = sta->local;
237
238 if (!locked) {
239 spin_lock_bh(&local->sta_lock);
240 sta_info_remove(sta);
241 spin_unlock_bh(&local->sta_lock);
242 } else {
243 sta_info_remove(sta);
244 }
245 if (local->ops->sta_table_notification)
246 local->ops->sta_table_notification(local_to_hw(local),
247 local->num_sta);
248
249 while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) {
250 local->total_ps_buffered--;
251 dev_kfree_skb_any(skb);
252 }
253 while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) {
254 dev_kfree_skb_any(skb);
255 }
256
257 if (sta->key) {
258 if (local->ops->set_key) {
259 struct ieee80211_key_conf *key;
260 key = ieee80211_key_data2conf(local, sta->key);
261 if (key) {
262 local->ops->set_key(local_to_hw(local),
263 DISABLE_KEY,
264 sta->addr, key, sta->aid);
265 kfree(key);
266 }
267 }
268 } else if (sta->key_idx_compression != HW_KEY_IDX_INVALID) {
269 struct ieee80211_key_conf conf;
270 memset(&conf, 0, sizeof(conf));
271 conf.hw_key_idx = sta->key_idx_compression;
272 conf.alg = ALG_NULL;
273 conf.flags |= IEEE80211_KEY_FORCE_SW_ENCRYPT;
274 local->ops->set_key(local_to_hw(local), DISABLE_KEY,
275 sta->addr, &conf, sta->aid);
276 sta->key_idx_compression = HW_KEY_IDX_INVALID;
277 }
278
Jiri Bence9f207f2007-05-05 11:46:38 -0700279#ifdef CONFIG_MAC80211_DEBUGFS
280 if (in_atomic()) {
281 list_add(&sta->list, &local->deleted_sta_list);
282 queue_work(local->hw.workqueue, &local->sta_debugfs_add);
283 } else
284#endif
285 finish_sta_info_free(local, sta);
Jiri Bencf0706e82007-05-05 11:45:53 -0700286}
287
288
289static inline int sta_info_buffer_expired(struct ieee80211_local *local,
290 struct sta_info *sta,
291 struct sk_buff *skb)
292{
293 struct ieee80211_tx_packet_data *pkt_data;
294 int timeout;
295
296 if (!skb)
297 return 0;
298
299 pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
300
301 /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
302 timeout = (sta->listen_interval * local->hw.conf.beacon_int * 32 /
303 15625) * HZ;
304 if (timeout < STA_TX_BUFFER_EXPIRE)
305 timeout = STA_TX_BUFFER_EXPIRE;
306 return time_after(jiffies, pkt_data->jiffies + timeout);
307}
308
309
310static void sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
311 struct sta_info *sta)
312{
313 unsigned long flags;
314 struct sk_buff *skb;
315
316 if (skb_queue_empty(&sta->ps_tx_buf))
317 return;
318
319 for (;;) {
320 spin_lock_irqsave(&sta->ps_tx_buf.lock, flags);
321 skb = skb_peek(&sta->ps_tx_buf);
322 if (sta_info_buffer_expired(local, sta, skb)) {
323 skb = __skb_dequeue(&sta->ps_tx_buf);
324 if (skb_queue_empty(&sta->ps_tx_buf))
325 sta->flags &= ~WLAN_STA_TIM;
326 } else
327 skb = NULL;
328 spin_unlock_irqrestore(&sta->ps_tx_buf.lock, flags);
329
330 if (skb) {
331 local->total_ps_buffered--;
332 printk(KERN_DEBUG "Buffered frame expired (STA "
333 MAC_FMT ")\n", MAC_ARG(sta->addr));
334 dev_kfree_skb(skb);
335 } else
336 break;
337 }
338}
339
340
341static void sta_info_cleanup(unsigned long data)
342{
343 struct ieee80211_local *local = (struct ieee80211_local *) data;
344 struct sta_info *sta;
345
346 spin_lock_bh(&local->sta_lock);
347 list_for_each_entry(sta, &local->sta_list, list) {
348 __sta_info_get(sta);
349 sta_info_cleanup_expire_buffered(local, sta);
350 sta_info_put(sta);
351 }
352 spin_unlock_bh(&local->sta_lock);
353
354 local->sta_cleanup.expires = jiffies + STA_INFO_CLEANUP_INTERVAL;
355 add_timer(&local->sta_cleanup);
356}
357
Jiri Bence9f207f2007-05-05 11:46:38 -0700358#ifdef CONFIG_MAC80211_DEBUGFS
359static void sta_info_debugfs_add_task(struct work_struct *work)
360{
361 struct ieee80211_local *local =
362 container_of(work, struct ieee80211_local, sta_debugfs_add);
363 struct sta_info *sta, *tmp;
364
365 while (1) {
366 spin_lock_bh(&local->sta_lock);
367 if (!list_empty(&local->deleted_sta_list)) {
368 sta = list_entry(local->deleted_sta_list.next,
369 struct sta_info, list);
370 list_del(local->deleted_sta_list.next);
371 } else
372 sta = NULL;
373 spin_unlock_bh(&local->sta_lock);
374 if (!sta)
375 break;
376 finish_sta_info_free(local, sta);
377 }
378
379 while (1) {
380 sta = NULL;
381 spin_lock_bh(&local->sta_lock);
382 list_for_each_entry(tmp, &local->sta_list, list) {
383 if (!tmp->debugfs_registered) {
384 sta = tmp;
385 __sta_info_get(sta);
386 break;
387 }
388 }
389 spin_unlock_bh(&local->sta_lock);
390
391 if (!sta)
392 break;
393
394 sta->debugfs_registered = 1;
395 ieee80211_sta_debugfs_add(sta);
396 rate_control_add_sta_debugfs(sta);
397 sta_info_put(sta);
398 }
399}
400#endif
401
Jiri Bencf0706e82007-05-05 11:45:53 -0700402void sta_info_init(struct ieee80211_local *local)
403{
404 spin_lock_init(&local->sta_lock);
405 INIT_LIST_HEAD(&local->sta_list);
406 INIT_LIST_HEAD(&local->deleted_sta_list);
407
408 init_timer(&local->sta_cleanup);
409 local->sta_cleanup.expires = jiffies + STA_INFO_CLEANUP_INTERVAL;
410 local->sta_cleanup.data = (unsigned long) local;
411 local->sta_cleanup.function = sta_info_cleanup;
Jiri Bence9f207f2007-05-05 11:46:38 -0700412
413#ifdef CONFIG_MAC80211_DEBUGFS
414 INIT_WORK(&local->sta_debugfs_add, sta_info_debugfs_add_task);
415#endif
Jiri Bencf0706e82007-05-05 11:45:53 -0700416}
417
418int sta_info_start(struct ieee80211_local *local)
419{
420 add_timer(&local->sta_cleanup);
421 return 0;
422}
423
424void sta_info_stop(struct ieee80211_local *local)
425{
426 struct sta_info *sta, *tmp;
427
428 del_timer(&local->sta_cleanup);
429
430 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
Jiri Bence9f207f2007-05-05 11:46:38 -0700431 /* sta_info_free must be called with 0 as the last
432 * parameter to ensure all debugfs sta entries are
433 * unregistered. We don't need locking at this
434 * point. */
Jiri Bencf0706e82007-05-05 11:45:53 -0700435 sta_info_free(sta, 0);
436 }
437}
438
439void sta_info_remove_aid_ptr(struct sta_info *sta)
440{
441 struct ieee80211_sub_if_data *sdata;
442
443 if (sta->aid <= 0)
444 return;
445
446 sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
447
448 if (sdata->local->ops->set_tim)
449 sdata->local->ops->set_tim(local_to_hw(sdata->local),
450 sta->aid, 0);
451 if (sdata->bss)
452 __bss_tim_clear(sdata->bss, sta->aid);
453}
454
455
456/**
457 * sta_info_flush - flush matching STA entries from the STA table
458 * @local: local interface data
459 * @dev: matching rule for the net device (sta->dev) or %NULL to match all STAs
460 */
461void sta_info_flush(struct ieee80211_local *local, struct net_device *dev)
462{
463 struct sta_info *sta, *tmp;
464
465 spin_lock_bh(&local->sta_lock);
466 list_for_each_entry_safe(sta, tmp, &local->sta_list, list)
467 if (!dev || dev == sta->dev)
468 sta_info_free(sta, 1);
469 spin_unlock_bh(&local->sta_lock);
470}