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f0706e82 JB |
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" | |
e9f207f0 JB |
22 | #include "debugfs_key.h" |
23 | #include "debugfs_sta.h" | |
f0706e82 JB |
24 | |
25 | /* Caller must hold local->sta_lock */ | |
26 | static 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 */ | |
35 | static 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 | ||
57 | static inline void __sta_info_get(struct sta_info *sta) | |
58 | { | |
59 | kref_get(&sta->kref); | |
60 | } | |
61 | ||
62 | struct 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 | } | |
79 | EXPORT_SYMBOL(sta_info_get); | |
80 | ||
81 | int 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 | ||
106 | static 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); | |
e9f207f0 JB |
125 | if (sta->key) |
126 | ieee80211_debugfs_key_sta_del(sta->key, sta); | |
f0706e82 JB |
127 | kfree(sta); |
128 | } | |
129 | ||
130 | ||
131 | void sta_info_put(struct sta_info *sta) | |
132 | { | |
133 | kref_put(&sta->kref, sta_info_release); | |
134 | } | |
135 | EXPORT_SYMBOL(sta_info_put); | |
136 | ||
137 | ||
138 | struct 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 | ||
e9f207f0 JB |
180 | #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 | ||
f0706e82 JB |
193 | return sta; |
194 | } | |
195 | ||
e9f207f0 JB |
196 | static 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 | ||
f0706e82 JB |
216 | static 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 | ||
233 | void 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 | ||
e9f207f0 JB |
279 | #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); | |
f0706e82 JB |
286 | } |
287 | ||
288 | ||
289 | static 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 | ||
310 | static 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 | ||
341 | static 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 | ||
e9f207f0 JB |
358 | #ifdef CONFIG_MAC80211_DEBUGFS |
359 | static 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 | ||
f0706e82 JB |
402 | void 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; | |
e9f207f0 JB |
412 | |
413 | #ifdef CONFIG_MAC80211_DEBUGFS | |
414 | INIT_WORK(&local->sta_debugfs_add, sta_info_debugfs_add_task); | |
415 | #endif | |
f0706e82 JB |
416 | } |
417 | ||
418 | int sta_info_start(struct ieee80211_local *local) | |
419 | { | |
420 | add_timer(&local->sta_cleanup); | |
421 | return 0; | |
422 | } | |
423 | ||
424 | void 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) { | |
e9f207f0 JB |
431 | /* 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. */ | |
f0706e82 JB |
435 | sta_info_free(sta, 0); |
436 | } | |
437 | } | |
438 | ||
439 | void 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 | */ | |
461 | void 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 | } |