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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> | |
0d174406 | 17 | #include <linux/timer.h> |
d0709a65 | 18 | #include <linux/rtnetlink.h> |
f0706e82 JB |
19 | |
20 | #include <net/mac80211.h> | |
21 | #include "ieee80211_i.h" | |
22 | #include "ieee80211_rate.h" | |
23 | #include "sta_info.h" | |
e9f207f0 | 24 | #include "debugfs_sta.h" |
ee385855 | 25 | #include "mesh.h" |
f0706e82 | 26 | |
d0709a65 JB |
27 | /** |
28 | * DOC: STA information lifetime rules | |
29 | * | |
30 | * STA info structures (&struct sta_info) are managed in a hash table | |
31 | * for faster lookup and a list for iteration. They are managed using | |
32 | * RCU, i.e. access to the list and hash table is protected by RCU. | |
33 | * | |
73651ee6 JB |
34 | * Upon allocating a STA info structure with @sta_info_alloc() or |
35 | * mesh_plink_alloc(), the caller owns that structure. It must then either | |
36 | * destroy it using @sta_info_destroy() (which is pretty useless) or insert | |
37 | * it into the hash table using @sta_info_insert() which demotes the reference | |
38 | * from ownership to a regular RCU-protected reference; if the function | |
39 | * is called without protection by an RCU critical section the reference | |
40 | * is instantly invalidated. | |
d0709a65 JB |
41 | * |
42 | * Because there are debugfs entries for each station, and adding those | |
43 | * must be able to sleep, it is also possible to "pin" a station entry, | |
44 | * that means it can be removed from the hash table but not be freed. | |
45 | * See the comment in @__sta_info_unlink() for more information. | |
46 | * | |
47 | * In order to remove a STA info structure, the caller needs to first | |
48 | * unlink it (@sta_info_unlink()) from the list and hash tables and | |
49 | * then wait for an RCU synchronisation before it can be freed. Due to | |
50 | * the pinning and the possibility of multiple callers trying to remove | |
51 | * the same STA info at the same time, @sta_info_unlink() can clear the | |
52 | * STA info pointer it is passed to indicate that the STA info is owned | |
53 | * by somebody else now. | |
54 | * | |
55 | * If @sta_info_unlink() did not clear the pointer then the caller owns | |
56 | * the STA info structure now and is responsible of destroying it with | |
57 | * a call to @sta_info_destroy(), not before RCU synchronisation, of | |
58 | * course. Note that sta_info_destroy() must be protected by the RTNL. | |
59 | * | |
60 | * In all other cases, there is no concept of ownership on a STA entry, | |
61 | * each structure is owned by the global hash table/list until it is | |
62 | * removed. All users of the structure need to be RCU protected so that | |
63 | * the structure won't be freed before they are done using it. | |
64 | */ | |
f0706e82 JB |
65 | |
66 | /* Caller must hold local->sta_lock */ | |
be8755e1 MW |
67 | static int sta_info_hash_del(struct ieee80211_local *local, |
68 | struct sta_info *sta) | |
f0706e82 JB |
69 | { |
70 | struct sta_info *s; | |
71 | ||
72 | s = local->sta_hash[STA_HASH(sta->addr)]; | |
73 | if (!s) | |
be8755e1 MW |
74 | return -ENOENT; |
75 | if (s == sta) { | |
d0709a65 JB |
76 | rcu_assign_pointer(local->sta_hash[STA_HASH(sta->addr)], |
77 | s->hnext); | |
be8755e1 | 78 | return 0; |
f0706e82 JB |
79 | } |
80 | ||
be8755e1 | 81 | while (s->hnext && s->hnext != sta) |
f0706e82 | 82 | s = s->hnext; |
be8755e1 | 83 | if (s->hnext) { |
d0709a65 | 84 | rcu_assign_pointer(s->hnext, sta->hnext); |
be8755e1 MW |
85 | return 0; |
86 | } | |
f0706e82 | 87 | |
be8755e1 | 88 | return -ENOENT; |
f0706e82 JB |
89 | } |
90 | ||
d0709a65 | 91 | /* protected by RCU */ |
43ba7e95 JB |
92 | static struct sta_info *__sta_info_find(struct ieee80211_local *local, |
93 | u8 *addr) | |
f0706e82 JB |
94 | { |
95 | struct sta_info *sta; | |
96 | ||
d0709a65 | 97 | sta = rcu_dereference(local->sta_hash[STA_HASH(addr)]); |
f0706e82 | 98 | while (sta) { |
43ba7e95 | 99 | if (compare_ether_addr(sta->addr, addr) == 0) |
f0706e82 | 100 | break; |
d0709a65 | 101 | sta = rcu_dereference(sta->hnext); |
f0706e82 | 102 | } |
43ba7e95 JB |
103 | return sta; |
104 | } | |
105 | ||
106 | struct sta_info *sta_info_get(struct ieee80211_local *local, u8 *addr) | |
107 | { | |
d0709a65 | 108 | return __sta_info_find(local, addr); |
f0706e82 JB |
109 | } |
110 | EXPORT_SYMBOL(sta_info_get); | |
111 | ||
ee385855 LCC |
112 | struct sta_info *sta_info_get_by_idx(struct ieee80211_local *local, int idx, |
113 | struct net_device *dev) | |
114 | { | |
115 | struct sta_info *sta; | |
116 | int i = 0; | |
117 | ||
d0709a65 | 118 | list_for_each_entry_rcu(sta, &local->sta_list, list) { |
ee385855 LCC |
119 | if (i < idx) { |
120 | ++i; | |
121 | continue; | |
d0709a65 | 122 | } else if (!dev || dev == sta->sdata->dev) { |
ee385855 LCC |
123 | return sta; |
124 | } | |
125 | } | |
ee385855 LCC |
126 | |
127 | return NULL; | |
128 | } | |
f0706e82 | 129 | |
d0709a65 | 130 | void sta_info_destroy(struct sta_info *sta) |
f0706e82 | 131 | { |
f0706e82 JB |
132 | struct ieee80211_local *local = sta->local; |
133 | struct sk_buff *skb; | |
07db2183 | 134 | int i; |
73651ee6 JB |
135 | DECLARE_MAC_BUF(mbuf); |
136 | ||
137 | if (!sta) | |
138 | return; | |
f0706e82 | 139 | |
d0709a65 JB |
140 | ASSERT_RTNL(); |
141 | might_sleep(); | |
142 | ||
143 | rate_control_remove_sta_debugfs(sta); | |
144 | ieee80211_sta_debugfs_remove(sta); | |
145 | ||
146 | #ifdef CONFIG_MAC80211_MESH | |
147 | if (ieee80211_vif_is_mesh(&sta->sdata->vif)) | |
148 | mesh_plink_deactivate(sta); | |
149 | #endif | |
150 | ||
151 | /* | |
152 | * NOTE: This will call synchronize_rcu() internally to | |
153 | * make sure no key references can be in use. We rely on | |
154 | * that here for the mesh code! | |
155 | */ | |
156 | ieee80211_key_free(sta->key); | |
157 | WARN_ON(sta->key); | |
158 | ||
159 | #ifdef CONFIG_MAC80211_MESH | |
160 | if (ieee80211_vif_is_mesh(&sta->sdata->vif)) | |
161 | del_timer_sync(&sta->plink_timer); | |
162 | #endif | |
163 | ||
f0706e82 JB |
164 | while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) { |
165 | local->total_ps_buffered--; | |
166 | dev_kfree_skb_any(skb); | |
167 | } | |
d0709a65 JB |
168 | |
169 | while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) | |
f0706e82 | 170 | dev_kfree_skb_any(skb); |
d0709a65 | 171 | |
fe3bf0f5 | 172 | for (i = 0; i < STA_TID_NUM; i++) { |
07db2183 | 173 | del_timer_sync(&sta->ampdu_mlme.tid_rx[i].session_timer); |
fe3bf0f5 RR |
174 | del_timer_sync(&sta->ampdu_mlme.tid_tx[i].addba_resp_timer); |
175 | } | |
f0706e82 JB |
176 | rate_control_free_sta(sta->rate_ctrl, sta->rate_ctrl_priv); |
177 | rate_control_put(sta->rate_ctrl); | |
d0709a65 | 178 | |
73651ee6 JB |
179 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
180 | printk(KERN_DEBUG "%s: Destroyed STA %s\n", | |
181 | wiphy_name(local->hw.wiphy), print_mac(mbuf, sta->addr)); | |
182 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ | |
183 | ||
f0706e82 JB |
184 | kfree(sta); |
185 | } | |
186 | ||
187 | ||
d0709a65 JB |
188 | /* Caller must hold local->sta_lock */ |
189 | static void sta_info_hash_add(struct ieee80211_local *local, | |
190 | struct sta_info *sta) | |
f0706e82 | 191 | { |
d0709a65 JB |
192 | sta->hnext = local->sta_hash[STA_HASH(sta->addr)]; |
193 | rcu_assign_pointer(local->sta_hash[STA_HASH(sta->addr)], sta); | |
f0706e82 | 194 | } |
f0706e82 | 195 | |
73651ee6 JB |
196 | struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata, |
197 | u8 *addr, gfp_t gfp) | |
f0706e82 | 198 | { |
d0709a65 | 199 | struct ieee80211_local *local = sdata->local; |
f0706e82 | 200 | struct sta_info *sta; |
16c5f15c | 201 | int i; |
73651ee6 | 202 | DECLARE_MAC_BUF(mbuf); |
f0706e82 | 203 | |
73651ee6 | 204 | sta = kzalloc(sizeof(*sta), gfp); |
f0706e82 | 205 | if (!sta) |
73651ee6 | 206 | return NULL; |
f0706e82 | 207 | |
d0709a65 JB |
208 | memcpy(sta->addr, addr, ETH_ALEN); |
209 | sta->local = local; | |
210 | sta->sdata = sdata; | |
f0706e82 JB |
211 | |
212 | sta->rate_ctrl = rate_control_get(local->rate_ctrl); | |
d0709a65 | 213 | sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl, |
73651ee6 | 214 | gfp); |
f0706e82 JB |
215 | if (!sta->rate_ctrl_priv) { |
216 | rate_control_put(sta->rate_ctrl); | |
f0706e82 | 217 | kfree(sta); |
73651ee6 | 218 | return NULL; |
f0706e82 JB |
219 | } |
220 | ||
16c5f15c | 221 | spin_lock_init(&sta->ampdu_mlme.ampdu_rx); |
fe3bf0f5 | 222 | spin_lock_init(&sta->ampdu_mlme.ampdu_tx); |
16c5f15c RR |
223 | for (i = 0; i < STA_TID_NUM; i++) { |
224 | /* timer_to_tid must be initialized with identity mapping to | |
225 | * enable session_timer's data differentiation. refer to | |
226 | * sta_rx_agg_session_timer_expired for useage */ | |
227 | sta->timer_to_tid[i] = i; | |
fe3bf0f5 RR |
228 | /* tid to tx queue: initialize according to HW (0 is valid) */ |
229 | sta->tid_to_tx_q[i] = local->hw.queues; | |
16c5f15c RR |
230 | /* rx timers */ |
231 | sta->ampdu_mlme.tid_rx[i].session_timer.function = | |
232 | sta_rx_agg_session_timer_expired; | |
233 | sta->ampdu_mlme.tid_rx[i].session_timer.data = | |
234 | (unsigned long)&sta->timer_to_tid[i]; | |
235 | init_timer(&sta->ampdu_mlme.tid_rx[i].session_timer); | |
fe3bf0f5 RR |
236 | /* tx timers */ |
237 | sta->ampdu_mlme.tid_tx[i].addba_resp_timer.function = | |
238 | sta_addba_resp_timer_expired; | |
239 | sta->ampdu_mlme.tid_tx[i].addba_resp_timer.data = | |
240 | (unsigned long)&sta->timer_to_tid[i]; | |
241 | init_timer(&sta->ampdu_mlme.tid_tx[i].addba_resp_timer); | |
16c5f15c | 242 | } |
f0706e82 JB |
243 | skb_queue_head_init(&sta->ps_tx_buf); |
244 | skb_queue_head_init(&sta->tx_filtered); | |
73651ee6 JB |
245 | |
246 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
247 | printk(KERN_DEBUG "%s: Allocated STA %s\n", | |
248 | wiphy_name(local->hw.wiphy), print_mac(mbuf, sta->addr)); | |
249 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ | |
250 | ||
251 | return sta; | |
252 | } | |
253 | ||
254 | int sta_info_insert(struct sta_info *sta) | |
255 | { | |
256 | struct ieee80211_local *local = sta->local; | |
257 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
258 | unsigned long flags; | |
259 | DECLARE_MAC_BUF(mac); | |
260 | ||
d0709a65 | 261 | spin_lock_irqsave(&local->sta_lock, flags); |
43ba7e95 | 262 | /* check if STA exists already */ |
73651ee6 | 263 | if (__sta_info_find(local, sta->addr)) { |
d0709a65 | 264 | spin_unlock_irqrestore(&local->sta_lock, flags); |
73651ee6 | 265 | return -EEXIST; |
43ba7e95 | 266 | } |
f0706e82 JB |
267 | list_add(&sta->list, &local->sta_list); |
268 | local->num_sta++; | |
269 | sta_info_hash_add(local, sta); | |
32bfd35d | 270 | |
d0709a65 JB |
271 | /* notify driver */ |
272 | if (local->ops->sta_notify) { | |
51fb61e7 | 273 | if (sdata->vif.type == IEEE80211_IF_TYPE_VLAN) |
32bfd35d JB |
274 | sdata = sdata->u.vlan.ap; |
275 | ||
276 | local->ops->sta_notify(local_to_hw(local), &sdata->vif, | |
73651ee6 | 277 | STA_NOTIFY_ADD, sta->addr); |
32bfd35d | 278 | } |
d0709a65 | 279 | |
f0706e82 | 280 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
73651ee6 JB |
281 | printk(KERN_DEBUG "%s: Inserted STA %s\n", |
282 | wiphy_name(local->hw.wiphy), print_mac(mac, sta->addr)); | |
f0706e82 JB |
283 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
284 | ||
73651ee6 JB |
285 | spin_unlock_irqrestore(&local->sta_lock, flags); |
286 | ||
e9f207f0 | 287 | #ifdef CONFIG_MAC80211_DEBUGFS |
be8755e1 MW |
288 | /* debugfs entry adding might sleep, so schedule process |
289 | * context task for adding entry for STAs that do not yet | |
290 | * have one. */ | |
291 | queue_work(local->hw.workqueue, &local->sta_debugfs_add); | |
e9f207f0 JB |
292 | #endif |
293 | ||
73651ee6 JB |
294 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
295 | mesh_accept_plinks_update(sdata); | |
296 | ||
297 | return 0; | |
f0706e82 JB |
298 | } |
299 | ||
004c872e JB |
300 | static inline void __bss_tim_set(struct ieee80211_if_ap *bss, u16 aid) |
301 | { | |
302 | /* | |
303 | * This format has been mandated by the IEEE specifications, | |
304 | * so this line may not be changed to use the __set_bit() format. | |
305 | */ | |
306 | bss->tim[aid / 8] |= (1 << (aid % 8)); | |
307 | } | |
308 | ||
309 | static inline void __bss_tim_clear(struct ieee80211_if_ap *bss, u16 aid) | |
310 | { | |
311 | /* | |
312 | * This format has been mandated by the IEEE specifications, | |
313 | * so this line may not be changed to use the __clear_bit() format. | |
314 | */ | |
315 | bss->tim[aid / 8] &= ~(1 << (aid % 8)); | |
316 | } | |
317 | ||
318 | static void __sta_info_set_tim_bit(struct ieee80211_if_ap *bss, | |
319 | struct sta_info *sta) | |
320 | { | |
321 | if (bss) | |
322 | __bss_tim_set(bss, sta->aid); | |
d0709a65 JB |
323 | if (sta->local->ops->set_tim) { |
324 | sta->local->tim_in_locked_section = true; | |
004c872e | 325 | sta->local->ops->set_tim(local_to_hw(sta->local), sta->aid, 1); |
d0709a65 JB |
326 | sta->local->tim_in_locked_section = false; |
327 | } | |
004c872e JB |
328 | } |
329 | ||
330 | void sta_info_set_tim_bit(struct sta_info *sta) | |
331 | { | |
d0709a65 | 332 | unsigned long flags; |
004c872e | 333 | |
d0709a65 JB |
334 | spin_lock_irqsave(&sta->local->sta_lock, flags); |
335 | __sta_info_set_tim_bit(sta->sdata->bss, sta); | |
336 | spin_unlock_irqrestore(&sta->local->sta_lock, flags); | |
004c872e JB |
337 | } |
338 | ||
339 | static void __sta_info_clear_tim_bit(struct ieee80211_if_ap *bss, | |
340 | struct sta_info *sta) | |
341 | { | |
342 | if (bss) | |
343 | __bss_tim_clear(bss, sta->aid); | |
d0709a65 JB |
344 | if (sta->local->ops->set_tim) { |
345 | sta->local->tim_in_locked_section = true; | |
004c872e | 346 | sta->local->ops->set_tim(local_to_hw(sta->local), sta->aid, 0); |
d0709a65 JB |
347 | sta->local->tim_in_locked_section = false; |
348 | } | |
004c872e JB |
349 | } |
350 | ||
351 | void sta_info_clear_tim_bit(struct sta_info *sta) | |
352 | { | |
d0709a65 | 353 | unsigned long flags; |
004c872e | 354 | |
d0709a65 JB |
355 | spin_lock_irqsave(&sta->local->sta_lock, flags); |
356 | __sta_info_clear_tim_bit(sta->sdata->bss, sta); | |
357 | spin_unlock_irqrestore(&sta->local->sta_lock, flags); | |
004c872e JB |
358 | } |
359 | ||
d0709a65 JB |
360 | /* |
361 | * See comment in __sta_info_unlink, | |
362 | * caller must hold local->sta_lock. | |
363 | */ | |
364 | static void __sta_info_pin(struct sta_info *sta) | |
f0706e82 | 365 | { |
d0709a65 JB |
366 | WARN_ON(sta->pin_status != STA_INFO_PIN_STAT_NORMAL); |
367 | sta->pin_status = STA_INFO_PIN_STAT_PINNED; | |
368 | } | |
f0706e82 | 369 | |
d0709a65 JB |
370 | /* |
371 | * See comment in __sta_info_unlink, returns sta if it | |
372 | * needs to be destroyed. | |
373 | */ | |
374 | static struct sta_info *__sta_info_unpin(struct sta_info *sta) | |
375 | { | |
376 | struct sta_info *ret = NULL; | |
377 | unsigned long flags; | |
be8755e1 | 378 | |
d0709a65 JB |
379 | spin_lock_irqsave(&sta->local->sta_lock, flags); |
380 | WARN_ON(sta->pin_status != STA_INFO_PIN_STAT_DESTROY && | |
381 | sta->pin_status != STA_INFO_PIN_STAT_PINNED); | |
382 | if (sta->pin_status == STA_INFO_PIN_STAT_DESTROY) | |
383 | ret = sta; | |
384 | sta->pin_status = STA_INFO_PIN_STAT_NORMAL; | |
385 | spin_unlock_irqrestore(&sta->local->sta_lock, flags); | |
ee385855 | 386 | |
d0709a65 | 387 | return ret; |
f0706e82 JB |
388 | } |
389 | ||
d0709a65 | 390 | static void __sta_info_unlink(struct sta_info **sta) |
f0706e82 | 391 | { |
d0709a65 JB |
392 | struct ieee80211_local *local = (*sta)->local; |
393 | struct ieee80211_sub_if_data *sdata = (*sta)->sdata; | |
394 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
395 | DECLARE_MAC_BUF(mbuf); | |
396 | #endif | |
397 | /* | |
398 | * pull caller's reference if we're already gone. | |
399 | */ | |
400 | if (sta_info_hash_del(local, *sta)) { | |
401 | *sta = NULL; | |
402 | return; | |
403 | } | |
be8755e1 | 404 | |
d0709a65 JB |
405 | /* |
406 | * Also pull caller's reference if the STA is pinned by the | |
407 | * task that is adding the debugfs entries. In that case, we | |
408 | * leave the STA "to be freed". | |
409 | * | |
410 | * The rules are not trivial, but not too complex either: | |
411 | * (1) pin_status is only modified under the sta_lock | |
412 | * (2) sta_info_debugfs_add_work() will set the status | |
413 | * to PINNED when it found an item that needs a new | |
414 | * debugfs directory created. In that case, that item | |
415 | * must not be freed although all *RCU* users are done | |
416 | * with it. Hence, we tell the caller of _unlink() | |
417 | * that the item is already gone (as can happen when | |
418 | * two tasks try to unlink/destroy at the same time) | |
419 | * (3) We set the pin_status to DESTROY here when we | |
420 | * find such an item. | |
421 | * (4) sta_info_debugfs_add_work() will reset the pin_status | |
422 | * from PINNED to NORMAL when it is done with the item, | |
423 | * but will check for DESTROY before resetting it in | |
424 | * which case it will free the item. | |
425 | */ | |
426 | if ((*sta)->pin_status == STA_INFO_PIN_STAT_PINNED) { | |
427 | (*sta)->pin_status = STA_INFO_PIN_STAT_DESTROY; | |
428 | *sta = NULL; | |
429 | return; | |
430 | } | |
f0706e82 | 431 | |
d0709a65 | 432 | list_del(&(*sta)->list); |
ee385855 | 433 | |
d0709a65 JB |
434 | if ((*sta)->flags & WLAN_STA_PS) { |
435 | (*sta)->flags &= ~WLAN_STA_PS; | |
436 | if (sdata->bss) | |
437 | atomic_dec(&sdata->bss->num_sta_ps); | |
438 | __sta_info_clear_tim_bit(sdata->bss, *sta); | |
f0706e82 JB |
439 | } |
440 | ||
d0709a65 | 441 | local->num_sta--; |
be8755e1 | 442 | |
32bfd35d | 443 | if (local->ops->sta_notify) { |
51fb61e7 | 444 | if (sdata->vif.type == IEEE80211_IF_TYPE_VLAN) |
32bfd35d JB |
445 | sdata = sdata->u.vlan.ap; |
446 | ||
447 | local->ops->sta_notify(local_to_hw(local), &sdata->vif, | |
d0709a65 | 448 | STA_NOTIFY_REMOVE, (*sta)->addr); |
32bfd35d | 449 | } |
478f8d2b | 450 | |
d0709a65 JB |
451 | if (ieee80211_vif_is_mesh(&sdata->vif)) { |
452 | mesh_accept_plinks_update(sdata); | |
453 | #ifdef CONFIG_MAC80211_MESH | |
454 | del_timer(&(*sta)->plink_timer); | |
455 | #endif | |
456 | } | |
be8755e1 | 457 | |
d0709a65 JB |
458 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
459 | printk(KERN_DEBUG "%s: Removed STA %s\n", | |
460 | wiphy_name(local->hw.wiphy), print_mac(mbuf, (*sta)->addr)); | |
461 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ | |
f0706e82 JB |
462 | } |
463 | ||
d0709a65 JB |
464 | void sta_info_unlink(struct sta_info **sta) |
465 | { | |
466 | struct ieee80211_local *local = (*sta)->local; | |
467 | unsigned long flags; | |
468 | ||
469 | spin_lock_irqsave(&local->sta_lock, flags); | |
470 | __sta_info_unlink(sta); | |
471 | spin_unlock_irqrestore(&local->sta_lock, flags); | |
472 | } | |
f0706e82 JB |
473 | |
474 | static inline int sta_info_buffer_expired(struct ieee80211_local *local, | |
475 | struct sta_info *sta, | |
476 | struct sk_buff *skb) | |
477 | { | |
478 | struct ieee80211_tx_packet_data *pkt_data; | |
479 | int timeout; | |
480 | ||
481 | if (!skb) | |
482 | return 0; | |
483 | ||
484 | pkt_data = (struct ieee80211_tx_packet_data *) skb->cb; | |
485 | ||
486 | /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */ | |
487 | timeout = (sta->listen_interval * local->hw.conf.beacon_int * 32 / | |
488 | 15625) * HZ; | |
489 | if (timeout < STA_TX_BUFFER_EXPIRE) | |
490 | timeout = STA_TX_BUFFER_EXPIRE; | |
491 | return time_after(jiffies, pkt_data->jiffies + timeout); | |
492 | } | |
493 | ||
494 | ||
495 | static void sta_info_cleanup_expire_buffered(struct ieee80211_local *local, | |
496 | struct sta_info *sta) | |
497 | { | |
498 | unsigned long flags; | |
499 | struct sk_buff *skb; | |
836341a7 | 500 | struct ieee80211_sub_if_data *sdata; |
0795af57 | 501 | DECLARE_MAC_BUF(mac); |
f0706e82 JB |
502 | |
503 | if (skb_queue_empty(&sta->ps_tx_buf)) | |
504 | return; | |
505 | ||
506 | for (;;) { | |
507 | spin_lock_irqsave(&sta->ps_tx_buf.lock, flags); | |
508 | skb = skb_peek(&sta->ps_tx_buf); | |
836341a7 | 509 | if (sta_info_buffer_expired(local, sta, skb)) |
f0706e82 | 510 | skb = __skb_dequeue(&sta->ps_tx_buf); |
836341a7 | 511 | else |
f0706e82 JB |
512 | skb = NULL; |
513 | spin_unlock_irqrestore(&sta->ps_tx_buf.lock, flags); | |
514 | ||
836341a7 | 515 | if (!skb) |
f0706e82 | 516 | break; |
836341a7 | 517 | |
d0709a65 | 518 | sdata = sta->sdata; |
836341a7 JB |
519 | local->total_ps_buffered--; |
520 | printk(KERN_DEBUG "Buffered frame expired (STA " | |
521 | "%s)\n", print_mac(mac, sta->addr)); | |
522 | dev_kfree_skb(skb); | |
523 | ||
004c872e JB |
524 | if (skb_queue_empty(&sta->ps_tx_buf)) |
525 | sta_info_clear_tim_bit(sta); | |
f0706e82 JB |
526 | } |
527 | } | |
528 | ||
529 | ||
530 | static void sta_info_cleanup(unsigned long data) | |
531 | { | |
532 | struct ieee80211_local *local = (struct ieee80211_local *) data; | |
533 | struct sta_info *sta; | |
534 | ||
d0709a65 JB |
535 | rcu_read_lock(); |
536 | list_for_each_entry_rcu(sta, &local->sta_list, list) | |
f0706e82 | 537 | sta_info_cleanup_expire_buffered(local, sta); |
d0709a65 | 538 | rcu_read_unlock(); |
f0706e82 | 539 | |
0d174406 JB |
540 | local->sta_cleanup.expires = |
541 | round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL); | |
f0706e82 JB |
542 | add_timer(&local->sta_cleanup); |
543 | } | |
544 | ||
e9f207f0 | 545 | #ifdef CONFIG_MAC80211_DEBUGFS |
d0709a65 | 546 | static void sta_info_debugfs_add_work(struct work_struct *work) |
e9f207f0 JB |
547 | { |
548 | struct ieee80211_local *local = | |
549 | container_of(work, struct ieee80211_local, sta_debugfs_add); | |
550 | struct sta_info *sta, *tmp; | |
d0709a65 | 551 | unsigned long flags; |
e9f207f0 | 552 | |
e9f207f0 JB |
553 | while (1) { |
554 | sta = NULL; | |
d0709a65 JB |
555 | |
556 | spin_lock_irqsave(&local->sta_lock, flags); | |
e9f207f0 | 557 | list_for_each_entry(tmp, &local->sta_list, list) { |
be8755e1 | 558 | if (!tmp->debugfs.dir) { |
e9f207f0 | 559 | sta = tmp; |
d0709a65 | 560 | __sta_info_pin(sta); |
e9f207f0 JB |
561 | break; |
562 | } | |
563 | } | |
d0709a65 | 564 | spin_unlock_irqrestore(&local->sta_lock, flags); |
e9f207f0 JB |
565 | |
566 | if (!sta) | |
567 | break; | |
568 | ||
e9f207f0 JB |
569 | ieee80211_sta_debugfs_add(sta); |
570 | rate_control_add_sta_debugfs(sta); | |
d0709a65 JB |
571 | |
572 | sta = __sta_info_unpin(sta); | |
573 | ||
574 | if (sta) { | |
575 | synchronize_rcu(); | |
576 | sta_info_destroy(sta); | |
577 | } | |
e9f207f0 JB |
578 | } |
579 | } | |
580 | #endif | |
581 | ||
f0706e82 JB |
582 | void sta_info_init(struct ieee80211_local *local) |
583 | { | |
d0709a65 | 584 | spin_lock_init(&local->sta_lock); |
f0706e82 | 585 | INIT_LIST_HEAD(&local->sta_list); |
f0706e82 | 586 | |
b24b8a24 PE |
587 | setup_timer(&local->sta_cleanup, sta_info_cleanup, |
588 | (unsigned long)local); | |
0d174406 JB |
589 | local->sta_cleanup.expires = |
590 | round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL); | |
e9f207f0 JB |
591 | |
592 | #ifdef CONFIG_MAC80211_DEBUGFS | |
d0709a65 | 593 | INIT_WORK(&local->sta_debugfs_add, sta_info_debugfs_add_work); |
e9f207f0 | 594 | #endif |
f0706e82 JB |
595 | } |
596 | ||
597 | int sta_info_start(struct ieee80211_local *local) | |
598 | { | |
599 | add_timer(&local->sta_cleanup); | |
600 | return 0; | |
601 | } | |
602 | ||
603 | void sta_info_stop(struct ieee80211_local *local) | |
604 | { | |
f0706e82 | 605 | del_timer(&local->sta_cleanup); |
be8755e1 | 606 | sta_info_flush(local, NULL); |
f0706e82 JB |
607 | } |
608 | ||
f0706e82 JB |
609 | /** |
610 | * sta_info_flush - flush matching STA entries from the STA table | |
611 | * @local: local interface data | |
d0709a65 | 612 | * @sdata: matching rule for the net device (sta->dev) or %NULL to match all STAs |
f0706e82 | 613 | */ |
d0709a65 JB |
614 | void sta_info_flush(struct ieee80211_local *local, |
615 | struct ieee80211_sub_if_data *sdata) | |
f0706e82 JB |
616 | { |
617 | struct sta_info *sta, *tmp; | |
be8755e1 | 618 | LIST_HEAD(tmp_list); |
d0709a65 | 619 | unsigned long flags; |
f0706e82 | 620 | |
d0709a65 | 621 | might_sleep(); |
be8755e1 | 622 | |
d0709a65 JB |
623 | spin_lock_irqsave(&local->sta_lock, flags); |
624 | list_for_each_entry_safe(sta, tmp, &local->sta_list, list) { | |
625 | if (!sdata || sdata == sta->sdata) { | |
626 | __sta_info_unlink(&sta); | |
627 | if (sta) | |
628 | list_add_tail(&sta->list, &tmp_list); | |
629 | } | |
be8755e1 | 630 | } |
d0709a65 JB |
631 | spin_unlock_irqrestore(&local->sta_lock, flags); |
632 | ||
633 | synchronize_rcu(); | |
634 | ||
635 | list_for_each_entry_safe(sta, tmp, &tmp_list, list) | |
636 | sta_info_destroy(sta); | |
f0706e82 | 637 | } |