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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 | * | |
03e4497e JB |
34 | * Upon allocating a STA info structure with sta_info_alloc(), the caller owns |
35 | * that structure. It must then either destroy it using sta_info_destroy() | |
36 | * (which is pretty useless) or insert it into the hash table using | |
37 | * sta_info_insert() which demotes the reference from ownership to a regular | |
38 | * RCU-protected reference; if the function is called without protection by an | |
39 | * RCU critical section the reference is instantly invalidated. | |
d0709a65 JB |
40 | * |
41 | * Because there are debugfs entries for each station, and adding those | |
42 | * must be able to sleep, it is also possible to "pin" a station entry, | |
43 | * that means it can be removed from the hash table but not be freed. | |
dbbea671 | 44 | * See the comment in __sta_info_unlink() for more information. |
d0709a65 JB |
45 | * |
46 | * In order to remove a STA info structure, the caller needs to first | |
dbbea671 | 47 | * unlink it (sta_info_unlink()) from the list and hash tables and |
d0709a65 JB |
48 | * then wait for an RCU synchronisation before it can be freed. Due to |
49 | * the pinning and the possibility of multiple callers trying to remove | |
dbbea671 | 50 | * the same STA info at the same time, sta_info_unlink() can clear the |
d0709a65 JB |
51 | * STA info pointer it is passed to indicate that the STA info is owned |
52 | * by somebody else now. | |
53 | * | |
dbbea671 | 54 | * If sta_info_unlink() did not clear the pointer then the caller owns |
d0709a65 | 55 | * the STA info structure now and is responsible of destroying it with |
dbbea671 | 56 | * a call to sta_info_destroy(), not before RCU synchronisation, of |
d0709a65 JB |
57 | * course. Note that sta_info_destroy() must be protected by the RTNL. |
58 | * | |
59 | * In all other cases, there is no concept of ownership on a STA entry, | |
60 | * each structure is owned by the global hash table/list until it is | |
61 | * removed. All users of the structure need to be RCU protected so that | |
62 | * the structure won't be freed before they are done using it. | |
63 | */ | |
f0706e82 JB |
64 | |
65 | /* Caller must hold local->sta_lock */ | |
be8755e1 MW |
66 | static int sta_info_hash_del(struct ieee80211_local *local, |
67 | struct sta_info *sta) | |
f0706e82 JB |
68 | { |
69 | struct sta_info *s; | |
70 | ||
71 | s = local->sta_hash[STA_HASH(sta->addr)]; | |
72 | if (!s) | |
be8755e1 MW |
73 | return -ENOENT; |
74 | if (s == sta) { | |
d0709a65 JB |
75 | rcu_assign_pointer(local->sta_hash[STA_HASH(sta->addr)], |
76 | s->hnext); | |
be8755e1 | 77 | return 0; |
f0706e82 JB |
78 | } |
79 | ||
be8755e1 | 80 | while (s->hnext && s->hnext != sta) |
f0706e82 | 81 | s = s->hnext; |
be8755e1 | 82 | if (s->hnext) { |
d0709a65 | 83 | rcu_assign_pointer(s->hnext, sta->hnext); |
be8755e1 MW |
84 | return 0; |
85 | } | |
f0706e82 | 86 | |
be8755e1 | 87 | return -ENOENT; |
f0706e82 JB |
88 | } |
89 | ||
d0709a65 | 90 | /* protected by RCU */ |
43ba7e95 JB |
91 | static struct sta_info *__sta_info_find(struct ieee80211_local *local, |
92 | u8 *addr) | |
f0706e82 JB |
93 | { |
94 | struct sta_info *sta; | |
95 | ||
d0709a65 | 96 | sta = rcu_dereference(local->sta_hash[STA_HASH(addr)]); |
f0706e82 | 97 | while (sta) { |
43ba7e95 | 98 | if (compare_ether_addr(sta->addr, addr) == 0) |
f0706e82 | 99 | break; |
d0709a65 | 100 | sta = rcu_dereference(sta->hnext); |
f0706e82 | 101 | } |
43ba7e95 JB |
102 | return sta; |
103 | } | |
104 | ||
105 | struct sta_info *sta_info_get(struct ieee80211_local *local, u8 *addr) | |
106 | { | |
d0709a65 | 107 | return __sta_info_find(local, addr); |
f0706e82 JB |
108 | } |
109 | EXPORT_SYMBOL(sta_info_get); | |
110 | ||
ee385855 LCC |
111 | struct sta_info *sta_info_get_by_idx(struct ieee80211_local *local, int idx, |
112 | struct net_device *dev) | |
113 | { | |
114 | struct sta_info *sta; | |
115 | int i = 0; | |
116 | ||
d0709a65 | 117 | list_for_each_entry_rcu(sta, &local->sta_list, list) { |
2a8ca29a LCC |
118 | if (dev && dev != sta->sdata->dev) |
119 | continue; | |
ee385855 LCC |
120 | if (i < idx) { |
121 | ++i; | |
122 | continue; | |
ee385855 | 123 | } |
2a8ca29a | 124 | return sta; |
ee385855 | 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 | ||
03e4497e | 251 | #ifdef CONFIG_MAC80211_MESH |
b4e08ea1 | 252 | sta->plink_state = PLINK_LISTEN; |
03e4497e JB |
253 | spin_lock_init(&sta->plink_lock); |
254 | init_timer(&sta->plink_timer); | |
255 | #endif | |
256 | ||
73651ee6 JB |
257 | return sta; |
258 | } | |
259 | ||
260 | int sta_info_insert(struct sta_info *sta) | |
261 | { | |
262 | struct ieee80211_local *local = sta->local; | |
263 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
264 | unsigned long flags; | |
265 | DECLARE_MAC_BUF(mac); | |
266 | ||
03e4497e JB |
267 | /* |
268 | * Can't be a WARN_ON because it can be triggered through a race: | |
269 | * something inserts a STA (on one CPU) without holding the RTNL | |
270 | * and another CPU turns off the net device. | |
271 | */ | |
272 | if (unlikely(!netif_running(sdata->dev))) | |
273 | return -ENETDOWN; | |
274 | ||
275 | if (WARN_ON(compare_ether_addr(sta->addr, sdata->dev->dev_addr) == 0)) | |
276 | return -EINVAL; | |
277 | ||
278 | if (WARN_ON(is_multicast_ether_addr(sta->addr))) | |
279 | return -EINVAL; | |
44213b5e | 280 | |
d0709a65 | 281 | spin_lock_irqsave(&local->sta_lock, flags); |
43ba7e95 | 282 | /* check if STA exists already */ |
73651ee6 | 283 | if (__sta_info_find(local, sta->addr)) { |
d0709a65 | 284 | spin_unlock_irqrestore(&local->sta_lock, flags); |
73651ee6 | 285 | return -EEXIST; |
43ba7e95 | 286 | } |
f0706e82 JB |
287 | list_add(&sta->list, &local->sta_list); |
288 | local->num_sta++; | |
289 | sta_info_hash_add(local, sta); | |
32bfd35d | 290 | |
d0709a65 JB |
291 | /* notify driver */ |
292 | if (local->ops->sta_notify) { | |
51fb61e7 | 293 | if (sdata->vif.type == IEEE80211_IF_TYPE_VLAN) |
32bfd35d JB |
294 | sdata = sdata->u.vlan.ap; |
295 | ||
296 | local->ops->sta_notify(local_to_hw(local), &sdata->vif, | |
73651ee6 | 297 | STA_NOTIFY_ADD, sta->addr); |
32bfd35d | 298 | } |
d0709a65 | 299 | |
f0706e82 | 300 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
73651ee6 JB |
301 | printk(KERN_DEBUG "%s: Inserted STA %s\n", |
302 | wiphy_name(local->hw.wiphy), print_mac(mac, sta->addr)); | |
f0706e82 JB |
303 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
304 | ||
73651ee6 JB |
305 | spin_unlock_irqrestore(&local->sta_lock, flags); |
306 | ||
e9f207f0 | 307 | #ifdef CONFIG_MAC80211_DEBUGFS |
be8755e1 MW |
308 | /* debugfs entry adding might sleep, so schedule process |
309 | * context task for adding entry for STAs that do not yet | |
310 | * have one. */ | |
311 | queue_work(local->hw.workqueue, &local->sta_debugfs_add); | |
e9f207f0 JB |
312 | #endif |
313 | ||
73651ee6 JB |
314 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
315 | mesh_accept_plinks_update(sdata); | |
316 | ||
317 | return 0; | |
f0706e82 JB |
318 | } |
319 | ||
004c872e JB |
320 | static inline void __bss_tim_set(struct ieee80211_if_ap *bss, u16 aid) |
321 | { | |
322 | /* | |
323 | * This format has been mandated by the IEEE specifications, | |
324 | * so this line may not be changed to use the __set_bit() format. | |
325 | */ | |
326 | bss->tim[aid / 8] |= (1 << (aid % 8)); | |
327 | } | |
328 | ||
329 | static inline void __bss_tim_clear(struct ieee80211_if_ap *bss, u16 aid) | |
330 | { | |
331 | /* | |
332 | * This format has been mandated by the IEEE specifications, | |
333 | * so this line may not be changed to use the __clear_bit() format. | |
334 | */ | |
335 | bss->tim[aid / 8] &= ~(1 << (aid % 8)); | |
336 | } | |
337 | ||
338 | static void __sta_info_set_tim_bit(struct ieee80211_if_ap *bss, | |
339 | struct sta_info *sta) | |
340 | { | |
341 | if (bss) | |
342 | __bss_tim_set(bss, sta->aid); | |
d0709a65 JB |
343 | if (sta->local->ops->set_tim) { |
344 | sta->local->tim_in_locked_section = true; | |
004c872e | 345 | sta->local->ops->set_tim(local_to_hw(sta->local), sta->aid, 1); |
d0709a65 JB |
346 | sta->local->tim_in_locked_section = false; |
347 | } | |
004c872e JB |
348 | } |
349 | ||
350 | void sta_info_set_tim_bit(struct sta_info *sta) | |
351 | { | |
d0709a65 | 352 | unsigned long flags; |
004c872e | 353 | |
d0709a65 JB |
354 | spin_lock_irqsave(&sta->local->sta_lock, flags); |
355 | __sta_info_set_tim_bit(sta->sdata->bss, sta); | |
356 | spin_unlock_irqrestore(&sta->local->sta_lock, flags); | |
004c872e JB |
357 | } |
358 | ||
359 | static void __sta_info_clear_tim_bit(struct ieee80211_if_ap *bss, | |
360 | struct sta_info *sta) | |
361 | { | |
362 | if (bss) | |
363 | __bss_tim_clear(bss, sta->aid); | |
d0709a65 JB |
364 | if (sta->local->ops->set_tim) { |
365 | sta->local->tim_in_locked_section = true; | |
004c872e | 366 | sta->local->ops->set_tim(local_to_hw(sta->local), sta->aid, 0); |
d0709a65 JB |
367 | sta->local->tim_in_locked_section = false; |
368 | } | |
004c872e JB |
369 | } |
370 | ||
371 | void sta_info_clear_tim_bit(struct sta_info *sta) | |
372 | { | |
d0709a65 | 373 | unsigned long flags; |
004c872e | 374 | |
d0709a65 JB |
375 | spin_lock_irqsave(&sta->local->sta_lock, flags); |
376 | __sta_info_clear_tim_bit(sta->sdata->bss, sta); | |
377 | spin_unlock_irqrestore(&sta->local->sta_lock, flags); | |
004c872e JB |
378 | } |
379 | ||
d0709a65 JB |
380 | /* |
381 | * See comment in __sta_info_unlink, | |
382 | * caller must hold local->sta_lock. | |
383 | */ | |
384 | static void __sta_info_pin(struct sta_info *sta) | |
f0706e82 | 385 | { |
d0709a65 JB |
386 | WARN_ON(sta->pin_status != STA_INFO_PIN_STAT_NORMAL); |
387 | sta->pin_status = STA_INFO_PIN_STAT_PINNED; | |
388 | } | |
f0706e82 | 389 | |
d0709a65 JB |
390 | /* |
391 | * See comment in __sta_info_unlink, returns sta if it | |
392 | * needs to be destroyed. | |
393 | */ | |
394 | static struct sta_info *__sta_info_unpin(struct sta_info *sta) | |
395 | { | |
396 | struct sta_info *ret = NULL; | |
397 | unsigned long flags; | |
be8755e1 | 398 | |
d0709a65 JB |
399 | spin_lock_irqsave(&sta->local->sta_lock, flags); |
400 | WARN_ON(sta->pin_status != STA_INFO_PIN_STAT_DESTROY && | |
401 | sta->pin_status != STA_INFO_PIN_STAT_PINNED); | |
402 | if (sta->pin_status == STA_INFO_PIN_STAT_DESTROY) | |
403 | ret = sta; | |
404 | sta->pin_status = STA_INFO_PIN_STAT_NORMAL; | |
405 | spin_unlock_irqrestore(&sta->local->sta_lock, flags); | |
ee385855 | 406 | |
d0709a65 | 407 | return ret; |
f0706e82 JB |
408 | } |
409 | ||
d0709a65 | 410 | static void __sta_info_unlink(struct sta_info **sta) |
f0706e82 | 411 | { |
d0709a65 JB |
412 | struct ieee80211_local *local = (*sta)->local; |
413 | struct ieee80211_sub_if_data *sdata = (*sta)->sdata; | |
414 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
415 | DECLARE_MAC_BUF(mbuf); | |
416 | #endif | |
417 | /* | |
418 | * pull caller's reference if we're already gone. | |
419 | */ | |
420 | if (sta_info_hash_del(local, *sta)) { | |
421 | *sta = NULL; | |
422 | return; | |
423 | } | |
be8755e1 | 424 | |
d0709a65 JB |
425 | /* |
426 | * Also pull caller's reference if the STA is pinned by the | |
427 | * task that is adding the debugfs entries. In that case, we | |
428 | * leave the STA "to be freed". | |
429 | * | |
430 | * The rules are not trivial, but not too complex either: | |
431 | * (1) pin_status is only modified under the sta_lock | |
432 | * (2) sta_info_debugfs_add_work() will set the status | |
433 | * to PINNED when it found an item that needs a new | |
434 | * debugfs directory created. In that case, that item | |
435 | * must not be freed although all *RCU* users are done | |
436 | * with it. Hence, we tell the caller of _unlink() | |
437 | * that the item is already gone (as can happen when | |
438 | * two tasks try to unlink/destroy at the same time) | |
439 | * (3) We set the pin_status to DESTROY here when we | |
440 | * find such an item. | |
441 | * (4) sta_info_debugfs_add_work() will reset the pin_status | |
442 | * from PINNED to NORMAL when it is done with the item, | |
443 | * but will check for DESTROY before resetting it in | |
444 | * which case it will free the item. | |
445 | */ | |
446 | if ((*sta)->pin_status == STA_INFO_PIN_STAT_PINNED) { | |
447 | (*sta)->pin_status = STA_INFO_PIN_STAT_DESTROY; | |
448 | *sta = NULL; | |
449 | return; | |
450 | } | |
f0706e82 | 451 | |
d0709a65 | 452 | list_del(&(*sta)->list); |
ee385855 | 453 | |
d0709a65 JB |
454 | if ((*sta)->flags & WLAN_STA_PS) { |
455 | (*sta)->flags &= ~WLAN_STA_PS; | |
456 | if (sdata->bss) | |
457 | atomic_dec(&sdata->bss->num_sta_ps); | |
458 | __sta_info_clear_tim_bit(sdata->bss, *sta); | |
f0706e82 JB |
459 | } |
460 | ||
d0709a65 | 461 | local->num_sta--; |
be8755e1 | 462 | |
32bfd35d | 463 | if (local->ops->sta_notify) { |
51fb61e7 | 464 | if (sdata->vif.type == IEEE80211_IF_TYPE_VLAN) |
32bfd35d JB |
465 | sdata = sdata->u.vlan.ap; |
466 | ||
467 | local->ops->sta_notify(local_to_hw(local), &sdata->vif, | |
d0709a65 | 468 | STA_NOTIFY_REMOVE, (*sta)->addr); |
32bfd35d | 469 | } |
478f8d2b | 470 | |
d0709a65 JB |
471 | if (ieee80211_vif_is_mesh(&sdata->vif)) { |
472 | mesh_accept_plinks_update(sdata); | |
473 | #ifdef CONFIG_MAC80211_MESH | |
474 | del_timer(&(*sta)->plink_timer); | |
475 | #endif | |
476 | } | |
be8755e1 | 477 | |
d0709a65 JB |
478 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
479 | printk(KERN_DEBUG "%s: Removed STA %s\n", | |
480 | wiphy_name(local->hw.wiphy), print_mac(mbuf, (*sta)->addr)); | |
481 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ | |
f0706e82 JB |
482 | } |
483 | ||
d0709a65 JB |
484 | void sta_info_unlink(struct sta_info **sta) |
485 | { | |
486 | struct ieee80211_local *local = (*sta)->local; | |
487 | unsigned long flags; | |
488 | ||
489 | spin_lock_irqsave(&local->sta_lock, flags); | |
490 | __sta_info_unlink(sta); | |
491 | spin_unlock_irqrestore(&local->sta_lock, flags); | |
492 | } | |
f0706e82 JB |
493 | |
494 | static inline int sta_info_buffer_expired(struct ieee80211_local *local, | |
495 | struct sta_info *sta, | |
496 | struct sk_buff *skb) | |
497 | { | |
498 | struct ieee80211_tx_packet_data *pkt_data; | |
499 | int timeout; | |
500 | ||
501 | if (!skb) | |
502 | return 0; | |
503 | ||
504 | pkt_data = (struct ieee80211_tx_packet_data *) skb->cb; | |
505 | ||
506 | /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */ | |
507 | timeout = (sta->listen_interval * local->hw.conf.beacon_int * 32 / | |
508 | 15625) * HZ; | |
509 | if (timeout < STA_TX_BUFFER_EXPIRE) | |
510 | timeout = STA_TX_BUFFER_EXPIRE; | |
511 | return time_after(jiffies, pkt_data->jiffies + timeout); | |
512 | } | |
513 | ||
514 | ||
515 | static void sta_info_cleanup_expire_buffered(struct ieee80211_local *local, | |
516 | struct sta_info *sta) | |
517 | { | |
518 | unsigned long flags; | |
519 | struct sk_buff *skb; | |
836341a7 | 520 | struct ieee80211_sub_if_data *sdata; |
0795af57 | 521 | DECLARE_MAC_BUF(mac); |
f0706e82 JB |
522 | |
523 | if (skb_queue_empty(&sta->ps_tx_buf)) | |
524 | return; | |
525 | ||
526 | for (;;) { | |
527 | spin_lock_irqsave(&sta->ps_tx_buf.lock, flags); | |
528 | skb = skb_peek(&sta->ps_tx_buf); | |
836341a7 | 529 | if (sta_info_buffer_expired(local, sta, skb)) |
f0706e82 | 530 | skb = __skb_dequeue(&sta->ps_tx_buf); |
836341a7 | 531 | else |
f0706e82 JB |
532 | skb = NULL; |
533 | spin_unlock_irqrestore(&sta->ps_tx_buf.lock, flags); | |
534 | ||
836341a7 | 535 | if (!skb) |
f0706e82 | 536 | break; |
836341a7 | 537 | |
d0709a65 | 538 | sdata = sta->sdata; |
836341a7 JB |
539 | local->total_ps_buffered--; |
540 | printk(KERN_DEBUG "Buffered frame expired (STA " | |
541 | "%s)\n", print_mac(mac, sta->addr)); | |
542 | dev_kfree_skb(skb); | |
543 | ||
004c872e JB |
544 | if (skb_queue_empty(&sta->ps_tx_buf)) |
545 | sta_info_clear_tim_bit(sta); | |
f0706e82 JB |
546 | } |
547 | } | |
548 | ||
549 | ||
550 | static void sta_info_cleanup(unsigned long data) | |
551 | { | |
552 | struct ieee80211_local *local = (struct ieee80211_local *) data; | |
553 | struct sta_info *sta; | |
554 | ||
d0709a65 JB |
555 | rcu_read_lock(); |
556 | list_for_each_entry_rcu(sta, &local->sta_list, list) | |
f0706e82 | 557 | sta_info_cleanup_expire_buffered(local, sta); |
d0709a65 | 558 | rcu_read_unlock(); |
f0706e82 | 559 | |
0d174406 JB |
560 | local->sta_cleanup.expires = |
561 | round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL); | |
f0706e82 JB |
562 | add_timer(&local->sta_cleanup); |
563 | } | |
564 | ||
e9f207f0 | 565 | #ifdef CONFIG_MAC80211_DEBUGFS |
d0709a65 | 566 | static void sta_info_debugfs_add_work(struct work_struct *work) |
e9f207f0 JB |
567 | { |
568 | struct ieee80211_local *local = | |
569 | container_of(work, struct ieee80211_local, sta_debugfs_add); | |
570 | struct sta_info *sta, *tmp; | |
d0709a65 | 571 | unsigned long flags; |
e9f207f0 | 572 | |
e9f207f0 JB |
573 | while (1) { |
574 | sta = NULL; | |
d0709a65 JB |
575 | |
576 | spin_lock_irqsave(&local->sta_lock, flags); | |
e9f207f0 | 577 | list_for_each_entry(tmp, &local->sta_list, list) { |
be8755e1 | 578 | if (!tmp->debugfs.dir) { |
e9f207f0 | 579 | sta = tmp; |
d0709a65 | 580 | __sta_info_pin(sta); |
e9f207f0 JB |
581 | break; |
582 | } | |
583 | } | |
d0709a65 | 584 | spin_unlock_irqrestore(&local->sta_lock, flags); |
e9f207f0 JB |
585 | |
586 | if (!sta) | |
587 | break; | |
588 | ||
e9f207f0 JB |
589 | ieee80211_sta_debugfs_add(sta); |
590 | rate_control_add_sta_debugfs(sta); | |
d0709a65 JB |
591 | |
592 | sta = __sta_info_unpin(sta); | |
593 | ||
594 | if (sta) { | |
595 | synchronize_rcu(); | |
596 | sta_info_destroy(sta); | |
597 | } | |
e9f207f0 JB |
598 | } |
599 | } | |
600 | #endif | |
601 | ||
f0706e82 JB |
602 | void sta_info_init(struct ieee80211_local *local) |
603 | { | |
d0709a65 | 604 | spin_lock_init(&local->sta_lock); |
f0706e82 | 605 | INIT_LIST_HEAD(&local->sta_list); |
f0706e82 | 606 | |
b24b8a24 PE |
607 | setup_timer(&local->sta_cleanup, sta_info_cleanup, |
608 | (unsigned long)local); | |
0d174406 JB |
609 | local->sta_cleanup.expires = |
610 | round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL); | |
e9f207f0 JB |
611 | |
612 | #ifdef CONFIG_MAC80211_DEBUGFS | |
d0709a65 | 613 | INIT_WORK(&local->sta_debugfs_add, sta_info_debugfs_add_work); |
e9f207f0 | 614 | #endif |
f0706e82 JB |
615 | } |
616 | ||
617 | int sta_info_start(struct ieee80211_local *local) | |
618 | { | |
619 | add_timer(&local->sta_cleanup); | |
620 | return 0; | |
621 | } | |
622 | ||
623 | void sta_info_stop(struct ieee80211_local *local) | |
624 | { | |
f0706e82 | 625 | del_timer(&local->sta_cleanup); |
be8755e1 | 626 | sta_info_flush(local, NULL); |
f0706e82 JB |
627 | } |
628 | ||
f0706e82 JB |
629 | /** |
630 | * sta_info_flush - flush matching STA entries from the STA table | |
44213b5e JB |
631 | * |
632 | * Returns the number of removed STA entries. | |
633 | * | |
f0706e82 | 634 | * @local: local interface data |
d0709a65 | 635 | * @sdata: matching rule for the net device (sta->dev) or %NULL to match all STAs |
f0706e82 | 636 | */ |
44213b5e | 637 | int sta_info_flush(struct ieee80211_local *local, |
d0709a65 | 638 | struct ieee80211_sub_if_data *sdata) |
f0706e82 JB |
639 | { |
640 | struct sta_info *sta, *tmp; | |
be8755e1 | 641 | LIST_HEAD(tmp_list); |
44213b5e | 642 | int ret = 0; |
d0709a65 | 643 | unsigned long flags; |
f0706e82 | 644 | |
d0709a65 | 645 | might_sleep(); |
be8755e1 | 646 | |
d0709a65 JB |
647 | spin_lock_irqsave(&local->sta_lock, flags); |
648 | list_for_each_entry_safe(sta, tmp, &local->sta_list, list) { | |
649 | if (!sdata || sdata == sta->sdata) { | |
650 | __sta_info_unlink(&sta); | |
44213b5e | 651 | if (sta) { |
d0709a65 | 652 | list_add_tail(&sta->list, &tmp_list); |
44213b5e JB |
653 | ret++; |
654 | } | |
d0709a65 | 655 | } |
be8755e1 | 656 | } |
d0709a65 JB |
657 | spin_unlock_irqrestore(&local->sta_lock, flags); |
658 | ||
659 | synchronize_rcu(); | |
660 | ||
661 | list_for_each_entry_safe(sta, tmp, &tmp_list, list) | |
662 | sta_info_destroy(sta); | |
44213b5e JB |
663 | |
664 | return ret; | |
f0706e82 | 665 | } |