Commit | Line | Data |
---|---|---|
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" | |
24487981 | 22 | #include "driver-ops.h" |
2c8dccc7 | 23 | #include "rate.h" |
f0706e82 | 24 | #include "sta_info.h" |
e9f207f0 | 25 | #include "debugfs_sta.h" |
ee385855 | 26 | #include "mesh.h" |
f0706e82 | 27 | |
d0709a65 JB |
28 | /** |
29 | * DOC: STA information lifetime rules | |
30 | * | |
31 | * STA info structures (&struct sta_info) are managed in a hash table | |
32 | * for faster lookup and a list for iteration. They are managed using | |
33 | * RCU, i.e. access to the list and hash table is protected by RCU. | |
34 | * | |
34e89507 JB |
35 | * Upon allocating a STA info structure with sta_info_alloc(), the caller |
36 | * owns that structure. It must then insert it into the hash table using | |
37 | * either sta_info_insert() or sta_info_insert_rcu(); only in the latter | |
38 | * case (which acquires an rcu read section but must not be called from | |
39 | * within one) will the pointer still be valid after the call. Note that | |
40 | * the caller may not do much with the STA info before inserting it, in | |
41 | * particular, it may not start any mesh peer link management or add | |
42 | * encryption keys. | |
93e5deb1 JB |
43 | * |
44 | * When the insertion fails (sta_info_insert()) returns non-zero), the | |
45 | * structure will have been freed by sta_info_insert()! | |
d0709a65 | 46 | * |
34e89507 | 47 | * Station entries are added by mac80211 when you establish a link with a |
7e189a12 LR |
48 | * peer. This means different things for the different type of interfaces |
49 | * we support. For a regular station this mean we add the AP sta when we | |
50 | * receive an assocation response from the AP. For IBSS this occurs when | |
34e89507 JB |
51 | * get to know about a peer on the same IBSS. For WDS we add the sta for |
52 | * the peer imediately upon device open. When using AP mode we add stations | |
53 | * for each respective station upon request from userspace through nl80211. | |
7e189a12 | 54 | * |
34e89507 JB |
55 | * In order to remove a STA info structure, various sta_info_destroy_*() |
56 | * calls are available. | |
d0709a65 | 57 | * |
34e89507 JB |
58 | * There is no concept of ownership on a STA entry, each structure is |
59 | * owned by the global hash table/list until it is removed. All users of | |
60 | * the structure need to be RCU protected so that the structure won't be | |
61 | * freed before they are done using it. | |
d0709a65 | 62 | */ |
f0706e82 JB |
63 | |
64 | /* Caller must hold local->sta_lock */ | |
be8755e1 MW |
65 | static int sta_info_hash_del(struct ieee80211_local *local, |
66 | struct sta_info *sta) | |
f0706e82 JB |
67 | { |
68 | struct sta_info *s; | |
69 | ||
17741cdc | 70 | s = local->sta_hash[STA_HASH(sta->sta.addr)]; |
f0706e82 | 71 | if (!s) |
be8755e1 MW |
72 | return -ENOENT; |
73 | if (s == sta) { | |
17741cdc | 74 | rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)], |
d0709a65 | 75 | s->hnext); |
be8755e1 | 76 | return 0; |
f0706e82 JB |
77 | } |
78 | ||
be8755e1 | 79 | while (s->hnext && s->hnext != sta) |
f0706e82 | 80 | s = s->hnext; |
be8755e1 | 81 | if (s->hnext) { |
d0709a65 | 82 | rcu_assign_pointer(s->hnext, sta->hnext); |
be8755e1 MW |
83 | return 0; |
84 | } | |
f0706e82 | 85 | |
be8755e1 | 86 | return -ENOENT; |
f0706e82 JB |
87 | } |
88 | ||
d0709a65 | 89 | /* protected by RCU */ |
abe60632 JB |
90 | struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata, |
91 | const u8 *addr) | |
f0706e82 | 92 | { |
abe60632 | 93 | struct ieee80211_local *local = sdata->local; |
f0706e82 JB |
94 | struct sta_info *sta; |
95 | ||
0379185b JB |
96 | sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)], |
97 | rcu_read_lock_held() || | |
98 | lockdep_is_held(&local->sta_lock) || | |
99 | lockdep_is_held(&local->sta_mtx)); | |
f0706e82 | 100 | while (sta) { |
abe60632 JB |
101 | if (sta->sdata == sdata && |
102 | memcmp(sta->sta.addr, addr, ETH_ALEN) == 0) | |
f0706e82 | 103 | break; |
0379185b JB |
104 | sta = rcu_dereference_check(sta->hnext, |
105 | rcu_read_lock_held() || | |
106 | lockdep_is_held(&local->sta_lock) || | |
107 | lockdep_is_held(&local->sta_mtx)); | |
f0706e82 | 108 | } |
43ba7e95 JB |
109 | return sta; |
110 | } | |
111 | ||
0e5ded5a FF |
112 | /* |
113 | * Get sta info either from the specified interface | |
114 | * or from one of its vlans | |
115 | */ | |
116 | struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata, | |
117 | const u8 *addr) | |
118 | { | |
119 | struct ieee80211_local *local = sdata->local; | |
120 | struct sta_info *sta; | |
121 | ||
0379185b JB |
122 | sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)], |
123 | rcu_read_lock_held() || | |
124 | lockdep_is_held(&local->sta_lock) || | |
125 | lockdep_is_held(&local->sta_mtx)); | |
0e5ded5a FF |
126 | while (sta) { |
127 | if ((sta->sdata == sdata || | |
128 | sta->sdata->bss == sdata->bss) && | |
129 | memcmp(sta->sta.addr, addr, ETH_ALEN) == 0) | |
130 | break; | |
0379185b JB |
131 | sta = rcu_dereference_check(sta->hnext, |
132 | rcu_read_lock_held() || | |
133 | lockdep_is_held(&local->sta_lock) || | |
134 | lockdep_is_held(&local->sta_mtx)); | |
0e5ded5a FF |
135 | } |
136 | return sta; | |
137 | } | |
138 | ||
3b53fde8 JB |
139 | struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata, |
140 | int idx) | |
ee385855 | 141 | { |
3b53fde8 | 142 | struct ieee80211_local *local = sdata->local; |
ee385855 LCC |
143 | struct sta_info *sta; |
144 | int i = 0; | |
145 | ||
d0709a65 | 146 | list_for_each_entry_rcu(sta, &local->sta_list, list) { |
3b53fde8 | 147 | if (sdata != sta->sdata) |
2a8ca29a | 148 | continue; |
ee385855 LCC |
149 | if (i < idx) { |
150 | ++i; | |
151 | continue; | |
ee385855 | 152 | } |
2a8ca29a | 153 | return sta; |
ee385855 | 154 | } |
ee385855 LCC |
155 | |
156 | return NULL; | |
157 | } | |
f0706e82 | 158 | |
93e5deb1 JB |
159 | /** |
160 | * __sta_info_free - internal STA free helper | |
161 | * | |
6ef307bc | 162 | * @local: pointer to the global information |
93e5deb1 JB |
163 | * @sta: STA info to free |
164 | * | |
165 | * This function must undo everything done by sta_info_alloc() | |
166 | * that may happen before sta_info_insert(). | |
167 | */ | |
168 | static void __sta_info_free(struct ieee80211_local *local, | |
169 | struct sta_info *sta) | |
170 | { | |
af65cd96 JB |
171 | if (sta->rate_ctrl) { |
172 | rate_control_free_sta(sta); | |
173 | rate_control_put(sta->rate_ctrl); | |
174 | } | |
93e5deb1 JB |
175 | |
176 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
0c68ae26 JB |
177 | printk(KERN_DEBUG "%s: Destroyed STA %pM\n", |
178 | wiphy_name(local->hw.wiphy), sta->sta.addr); | |
93e5deb1 JB |
179 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
180 | ||
181 | kfree(sta); | |
182 | } | |
183 | ||
d0709a65 JB |
184 | /* Caller must hold local->sta_lock */ |
185 | static void sta_info_hash_add(struct ieee80211_local *local, | |
186 | struct sta_info *sta) | |
f0706e82 | 187 | { |
17741cdc JB |
188 | sta->hnext = local->sta_hash[STA_HASH(sta->sta.addr)]; |
189 | rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)], sta); | |
f0706e82 | 190 | } |
f0706e82 | 191 | |
af818581 JB |
192 | static void sta_unblock(struct work_struct *wk) |
193 | { | |
194 | struct sta_info *sta; | |
195 | ||
196 | sta = container_of(wk, struct sta_info, drv_unblock_wk); | |
197 | ||
198 | if (sta->dead) | |
199 | return; | |
200 | ||
201 | if (!test_sta_flags(sta, WLAN_STA_PS_STA)) | |
202 | ieee80211_sta_ps_deliver_wakeup(sta); | |
203 | else if (test_and_clear_sta_flags(sta, WLAN_STA_PSPOLL)) | |
204 | ieee80211_sta_ps_deliver_poll_response(sta); | |
205 | } | |
206 | ||
af65cd96 JB |
207 | static int sta_prepare_rate_control(struct ieee80211_local *local, |
208 | struct sta_info *sta, gfp_t gfp) | |
209 | { | |
210 | if (local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL) | |
211 | return 0; | |
212 | ||
213 | sta->rate_ctrl = rate_control_get(local->rate_ctrl); | |
214 | sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl, | |
215 | &sta->sta, gfp); | |
216 | if (!sta->rate_ctrl_priv) { | |
217 | rate_control_put(sta->rate_ctrl); | |
218 | return -ENOMEM; | |
219 | } | |
220 | ||
221 | return 0; | |
222 | } | |
223 | ||
73651ee6 JB |
224 | struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata, |
225 | u8 *addr, gfp_t gfp) | |
f0706e82 | 226 | { |
d0709a65 | 227 | struct ieee80211_local *local = sdata->local; |
f0706e82 | 228 | struct sta_info *sta; |
16c5f15c | 229 | int i; |
f0706e82 | 230 | |
17741cdc | 231 | sta = kzalloc(sizeof(*sta) + local->hw.sta_data_size, gfp); |
f0706e82 | 232 | if (!sta) |
73651ee6 | 233 | return NULL; |
f0706e82 | 234 | |
07346f81 | 235 | spin_lock_init(&sta->lock); |
5a9f7b04 | 236 | spin_lock_init(&sta->flaglock); |
af818581 | 237 | INIT_WORK(&sta->drv_unblock_wk, sta_unblock); |
07346f81 | 238 | |
17741cdc | 239 | memcpy(sta->sta.addr, addr, ETH_ALEN); |
d0709a65 JB |
240 | sta->local = local; |
241 | sta->sdata = sdata; | |
f0706e82 | 242 | |
af65cd96 | 243 | if (sta_prepare_rate_control(local, sta, gfp)) { |
f0706e82 | 244 | kfree(sta); |
73651ee6 | 245 | return NULL; |
f0706e82 JB |
246 | } |
247 | ||
16c5f15c RR |
248 | for (i = 0; i < STA_TID_NUM; i++) { |
249 | /* timer_to_tid must be initialized with identity mapping to | |
250 | * enable session_timer's data differentiation. refer to | |
251 | * sta_rx_agg_session_timer_expired for useage */ | |
252 | sta->timer_to_tid[i] = i; | |
cee24a3e RR |
253 | /* rx */ |
254 | sta->ampdu_mlme.tid_state_rx[i] = HT_AGG_STATE_IDLE; | |
255 | sta->ampdu_mlme.tid_rx[i] = NULL; | |
256 | /* tx */ | |
257 | sta->ampdu_mlme.tid_state_tx[i] = HT_AGG_STATE_IDLE; | |
258 | sta->ampdu_mlme.tid_tx[i] = NULL; | |
259 | sta->ampdu_mlme.addba_req_num[i] = 0; | |
16c5f15c | 260 | } |
f0706e82 JB |
261 | skb_queue_head_init(&sta->ps_tx_buf); |
262 | skb_queue_head_init(&sta->tx_filtered); | |
73651ee6 | 263 | |
cccaec98 SB |
264 | for (i = 0; i < NUM_RX_DATA_QUEUES; i++) |
265 | sta->last_seq_ctrl[i] = cpu_to_le16(USHORT_MAX); | |
266 | ||
73651ee6 | 267 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
0c68ae26 JB |
268 | printk(KERN_DEBUG "%s: Allocated STA %pM\n", |
269 | wiphy_name(local->hw.wiphy), sta->sta.addr); | |
73651ee6 JB |
270 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
271 | ||
03e4497e | 272 | #ifdef CONFIG_MAC80211_MESH |
b4e08ea1 | 273 | sta->plink_state = PLINK_LISTEN; |
03e4497e JB |
274 | init_timer(&sta->plink_timer); |
275 | #endif | |
276 | ||
73651ee6 JB |
277 | return sta; |
278 | } | |
279 | ||
34e89507 | 280 | static int sta_info_finish_insert(struct sta_info *sta, bool async) |
73651ee6 JB |
281 | { |
282 | struct ieee80211_local *local = sta->local; | |
283 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
98b62183 | 284 | struct station_info sinfo; |
73651ee6 | 285 | unsigned long flags; |
93e5deb1 | 286 | int err = 0; |
73651ee6 | 287 | |
34e89507 JB |
288 | WARN_ON(!mutex_is_locked(&local->sta_mtx)); |
289 | ||
290 | /* notify driver */ | |
291 | if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) | |
292 | sdata = container_of(sdata->bss, | |
293 | struct ieee80211_sub_if_data, | |
294 | u.ap); | |
295 | err = drv_sta_add(local, sdata, &sta->sta); | |
296 | if (err) { | |
297 | if (!async) | |
298 | return err; | |
299 | printk(KERN_DEBUG "%s: failed to add IBSS STA %pM to driver (%d)" | |
300 | " - keeping it anyway.\n", | |
301 | sdata->name, sta->sta.addr, err); | |
302 | } else { | |
303 | sta->uploaded = true; | |
304 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
305 | if (async) | |
306 | printk(KERN_DEBUG "%s: Finished adding IBSS STA %pM\n", | |
307 | wiphy_name(local->hw.wiphy), sta->sta.addr); | |
308 | #endif | |
309 | } | |
310 | ||
311 | sdata = sta->sdata; | |
312 | ||
313 | if (!async) { | |
314 | local->num_sta++; | |
315 | local->sta_generation++; | |
316 | smp_mb(); | |
317 | ||
318 | /* make the station visible */ | |
319 | spin_lock_irqsave(&local->sta_lock, flags); | |
320 | sta_info_hash_add(local, sta); | |
321 | spin_unlock_irqrestore(&local->sta_lock, flags); | |
322 | } | |
323 | ||
324 | list_add(&sta->list, &local->sta_list); | |
325 | ||
326 | ieee80211_sta_debugfs_add(sta); | |
327 | rate_control_add_sta_debugfs(sta); | |
328 | ||
329 | sinfo.filled = 0; | |
330 | sinfo.generation = local->sta_generation; | |
331 | cfg80211_new_sta(sdata->dev, sta->sta.addr, &sinfo, GFP_KERNEL); | |
332 | ||
333 | ||
334 | return 0; | |
335 | } | |
336 | ||
337 | static void sta_info_finish_pending(struct ieee80211_local *local) | |
338 | { | |
339 | struct sta_info *sta; | |
340 | unsigned long flags; | |
341 | ||
342 | spin_lock_irqsave(&local->sta_lock, flags); | |
343 | while (!list_empty(&local->sta_pending_list)) { | |
344 | sta = list_first_entry(&local->sta_pending_list, | |
345 | struct sta_info, list); | |
346 | list_del(&sta->list); | |
347 | spin_unlock_irqrestore(&local->sta_lock, flags); | |
348 | ||
349 | sta_info_finish_insert(sta, true); | |
350 | ||
351 | spin_lock_irqsave(&local->sta_lock, flags); | |
352 | } | |
353 | spin_unlock_irqrestore(&local->sta_lock, flags); | |
354 | } | |
355 | ||
356 | static void sta_info_finish_work(struct work_struct *work) | |
357 | { | |
358 | struct ieee80211_local *local = | |
359 | container_of(work, struct ieee80211_local, sta_finish_work); | |
360 | ||
361 | mutex_lock(&local->sta_mtx); | |
362 | sta_info_finish_pending(local); | |
363 | mutex_unlock(&local->sta_mtx); | |
364 | } | |
365 | ||
366 | int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU) | |
367 | { | |
368 | struct ieee80211_local *local = sta->local; | |
369 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
370 | unsigned long flags; | |
371 | int err = 0; | |
372 | ||
03e4497e JB |
373 | /* |
374 | * Can't be a WARN_ON because it can be triggered through a race: | |
375 | * something inserts a STA (on one CPU) without holding the RTNL | |
376 | * and another CPU turns off the net device. | |
377 | */ | |
9607e6b6 | 378 | if (unlikely(!ieee80211_sdata_running(sdata))) { |
93e5deb1 | 379 | err = -ENETDOWN; |
34e89507 | 380 | rcu_read_lock(); |
93e5deb1 JB |
381 | goto out_free; |
382 | } | |
03e4497e | 383 | |
47846c9b | 384 | if (WARN_ON(compare_ether_addr(sta->sta.addr, sdata->vif.addr) == 0 || |
c6a1fa12 | 385 | is_multicast_ether_addr(sta->sta.addr))) { |
93e5deb1 | 386 | err = -EINVAL; |
34e89507 | 387 | rcu_read_lock(); |
93e5deb1 JB |
388 | goto out_free; |
389 | } | |
44213b5e | 390 | |
34e89507 JB |
391 | /* |
392 | * In ad-hoc mode, we sometimes need to insert stations | |
393 | * from tasklet context from the RX path. To avoid races, | |
394 | * always do so in that case -- see the comment below. | |
395 | */ | |
396 | if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { | |
397 | spin_lock_irqsave(&local->sta_lock, flags); | |
398 | /* check if STA exists already */ | |
399 | if (sta_info_get_bss(sdata, sta->sta.addr)) { | |
400 | spin_unlock_irqrestore(&local->sta_lock, flags); | |
401 | rcu_read_lock(); | |
402 | err = -EEXIST; | |
403 | goto out_free; | |
404 | } | |
405 | ||
406 | local->num_sta++; | |
407 | local->sta_generation++; | |
408 | smp_mb(); | |
409 | sta_info_hash_add(local, sta); | |
410 | ||
411 | list_add_tail(&sta->list, &local->sta_pending_list); | |
412 | ||
413 | rcu_read_lock(); | |
414 | spin_unlock_irqrestore(&local->sta_lock, flags); | |
415 | ||
416 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
417 | printk(KERN_DEBUG "%s: Added IBSS STA %pM\n", | |
418 | wiphy_name(local->hw.wiphy), sta->sta.addr); | |
419 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ | |
420 | ||
421 | ieee80211_queue_work(&local->hw, &local->sta_finish_work); | |
422 | ||
423 | return 0; | |
424 | } | |
425 | ||
426 | /* | |
427 | * On first glance, this will look racy, because the code | |
428 | * below this point, which inserts a station with sleeping, | |
429 | * unlocks the sta_lock between checking existence in the | |
430 | * hash table and inserting into it. | |
431 | * | |
432 | * However, it is not racy against itself because it keeps | |
433 | * the mutex locked. It still seems to race against the | |
434 | * above code that atomically inserts the station... That, | |
435 | * however, is not true because the above code can only | |
436 | * be invoked for IBSS interfaces, and the below code will | |
437 | * not be -- and the two do not race against each other as | |
438 | * the hash table also keys off the interface. | |
439 | */ | |
440 | ||
441 | might_sleep(); | |
442 | ||
443 | mutex_lock(&local->sta_mtx); | |
444 | ||
d0709a65 | 445 | spin_lock_irqsave(&local->sta_lock, flags); |
43ba7e95 | 446 | /* check if STA exists already */ |
34e89507 | 447 | if (sta_info_get_bss(sdata, sta->sta.addr)) { |
d0709a65 | 448 | spin_unlock_irqrestore(&local->sta_lock, flags); |
38a679a5 | 449 | mutex_unlock(&local->sta_mtx); |
34e89507 | 450 | rcu_read_lock(); |
93e5deb1 JB |
451 | err = -EEXIST; |
452 | goto out_free; | |
43ba7e95 | 453 | } |
32bfd35d | 454 | |
34e89507 | 455 | spin_unlock_irqrestore(&local->sta_lock, flags); |
32bfd35d | 456 | |
34e89507 JB |
457 | err = sta_info_finish_insert(sta, false); |
458 | if (err) { | |
459 | mutex_unlock(&local->sta_mtx); | |
460 | rcu_read_lock(); | |
461 | goto out_free; | |
32bfd35d | 462 | } |
d0709a65 | 463 | |
f0706e82 | 464 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
0c68ae26 JB |
465 | printk(KERN_DEBUG "%s: Inserted STA %pM\n", |
466 | wiphy_name(local->hw.wiphy), sta->sta.addr); | |
f0706e82 JB |
467 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
468 | ||
34e89507 JB |
469 | /* move reference to rcu-protected */ |
470 | rcu_read_lock(); | |
471 | mutex_unlock(&local->sta_mtx); | |
e9f207f0 | 472 | |
73651ee6 JB |
473 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
474 | mesh_accept_plinks_update(sdata); | |
475 | ||
476 | return 0; | |
93e5deb1 JB |
477 | out_free: |
478 | BUG_ON(!err); | |
479 | __sta_info_free(local, sta); | |
480 | return err; | |
f0706e82 JB |
481 | } |
482 | ||
34e89507 JB |
483 | int sta_info_insert(struct sta_info *sta) |
484 | { | |
485 | int err = sta_info_insert_rcu(sta); | |
486 | ||
487 | rcu_read_unlock(); | |
488 | ||
489 | return err; | |
490 | } | |
491 | ||
004c872e JB |
492 | static inline void __bss_tim_set(struct ieee80211_if_ap *bss, u16 aid) |
493 | { | |
494 | /* | |
495 | * This format has been mandated by the IEEE specifications, | |
496 | * so this line may not be changed to use the __set_bit() format. | |
497 | */ | |
498 | bss->tim[aid / 8] |= (1 << (aid % 8)); | |
499 | } | |
500 | ||
501 | static inline void __bss_tim_clear(struct ieee80211_if_ap *bss, u16 aid) | |
502 | { | |
503 | /* | |
504 | * This format has been mandated by the IEEE specifications, | |
505 | * so this line may not be changed to use the __clear_bit() format. | |
506 | */ | |
507 | bss->tim[aid / 8] &= ~(1 << (aid % 8)); | |
508 | } | |
509 | ||
510 | static void __sta_info_set_tim_bit(struct ieee80211_if_ap *bss, | |
511 | struct sta_info *sta) | |
512 | { | |
3e122be0 JB |
513 | BUG_ON(!bss); |
514 | ||
17741cdc | 515 | __bss_tim_set(bss, sta->sta.aid); |
3e122be0 | 516 | |
d0709a65 JB |
517 | if (sta->local->ops->set_tim) { |
518 | sta->local->tim_in_locked_section = true; | |
24487981 | 519 | drv_set_tim(sta->local, &sta->sta, true); |
d0709a65 JB |
520 | sta->local->tim_in_locked_section = false; |
521 | } | |
004c872e JB |
522 | } |
523 | ||
524 | void sta_info_set_tim_bit(struct sta_info *sta) | |
525 | { | |
d0709a65 | 526 | unsigned long flags; |
004c872e | 527 | |
3e122be0 JB |
528 | BUG_ON(!sta->sdata->bss); |
529 | ||
d0709a65 JB |
530 | spin_lock_irqsave(&sta->local->sta_lock, flags); |
531 | __sta_info_set_tim_bit(sta->sdata->bss, sta); | |
532 | spin_unlock_irqrestore(&sta->local->sta_lock, flags); | |
004c872e JB |
533 | } |
534 | ||
535 | static void __sta_info_clear_tim_bit(struct ieee80211_if_ap *bss, | |
536 | struct sta_info *sta) | |
537 | { | |
3e122be0 JB |
538 | BUG_ON(!bss); |
539 | ||
17741cdc | 540 | __bss_tim_clear(bss, sta->sta.aid); |
3e122be0 | 541 | |
d0709a65 JB |
542 | if (sta->local->ops->set_tim) { |
543 | sta->local->tim_in_locked_section = true; | |
24487981 | 544 | drv_set_tim(sta->local, &sta->sta, false); |
d0709a65 JB |
545 | sta->local->tim_in_locked_section = false; |
546 | } | |
004c872e JB |
547 | } |
548 | ||
549 | void sta_info_clear_tim_bit(struct sta_info *sta) | |
550 | { | |
d0709a65 | 551 | unsigned long flags; |
004c872e | 552 | |
3e122be0 JB |
553 | BUG_ON(!sta->sdata->bss); |
554 | ||
d0709a65 JB |
555 | spin_lock_irqsave(&sta->local->sta_lock, flags); |
556 | __sta_info_clear_tim_bit(sta->sdata->bss, sta); | |
557 | spin_unlock_irqrestore(&sta->local->sta_lock, flags); | |
004c872e JB |
558 | } |
559 | ||
57c4d7b4 JB |
560 | static int sta_info_buffer_expired(struct sta_info *sta, |
561 | struct sk_buff *skb) | |
f0706e82 | 562 | { |
e039fa4a | 563 | struct ieee80211_tx_info *info; |
f0706e82 JB |
564 | int timeout; |
565 | ||
566 | if (!skb) | |
567 | return 0; | |
568 | ||
e039fa4a | 569 | info = IEEE80211_SKB_CB(skb); |
f0706e82 JB |
570 | |
571 | /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */ | |
57c4d7b4 JB |
572 | timeout = (sta->listen_interval * |
573 | sta->sdata->vif.bss_conf.beacon_int * | |
574 | 32 / 15625) * HZ; | |
f0706e82 JB |
575 | if (timeout < STA_TX_BUFFER_EXPIRE) |
576 | timeout = STA_TX_BUFFER_EXPIRE; | |
e039fa4a | 577 | return time_after(jiffies, info->control.jiffies + timeout); |
f0706e82 JB |
578 | } |
579 | ||
580 | ||
581 | static void sta_info_cleanup_expire_buffered(struct ieee80211_local *local, | |
582 | struct sta_info *sta) | |
583 | { | |
584 | unsigned long flags; | |
585 | struct sk_buff *skb; | |
836341a7 | 586 | struct ieee80211_sub_if_data *sdata; |
f0706e82 JB |
587 | |
588 | if (skb_queue_empty(&sta->ps_tx_buf)) | |
589 | return; | |
590 | ||
591 | for (;;) { | |
592 | spin_lock_irqsave(&sta->ps_tx_buf.lock, flags); | |
593 | skb = skb_peek(&sta->ps_tx_buf); | |
57c4d7b4 | 594 | if (sta_info_buffer_expired(sta, skb)) |
f0706e82 | 595 | skb = __skb_dequeue(&sta->ps_tx_buf); |
836341a7 | 596 | else |
f0706e82 JB |
597 | skb = NULL; |
598 | spin_unlock_irqrestore(&sta->ps_tx_buf.lock, flags); | |
599 | ||
836341a7 | 600 | if (!skb) |
f0706e82 | 601 | break; |
836341a7 | 602 | |
d0709a65 | 603 | sdata = sta->sdata; |
836341a7 | 604 | local->total_ps_buffered--; |
f4ea83dd | 605 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 JB |
606 | printk(KERN_DEBUG "Buffered frame expired (STA %pM)\n", |
607 | sta->sta.addr); | |
f4ea83dd | 608 | #endif |
836341a7 JB |
609 | dev_kfree_skb(skb); |
610 | ||
004c872e JB |
611 | if (skb_queue_empty(&sta->ps_tx_buf)) |
612 | sta_info_clear_tim_bit(sta); | |
f0706e82 JB |
613 | } |
614 | } | |
615 | ||
34e89507 | 616 | static int __must_check __sta_info_destroy(struct sta_info *sta) |
f0706e82 | 617 | { |
34e89507 JB |
618 | struct ieee80211_local *local; |
619 | struct ieee80211_sub_if_data *sdata; | |
620 | struct sk_buff *skb; | |
621 | unsigned long flags; | |
622 | int ret, i; | |
f0706e82 | 623 | |
34e89507 | 624 | might_sleep(); |
f0706e82 | 625 | |
34e89507 JB |
626 | if (!sta) |
627 | return -ENOENT; | |
5bb644a0 | 628 | |
34e89507 JB |
629 | local = sta->local; |
630 | sdata = sta->sdata; | |
f0706e82 | 631 | |
34e89507 JB |
632 | spin_lock_irqsave(&local->sta_lock, flags); |
633 | ret = sta_info_hash_del(local, sta); | |
634 | /* this might still be the pending list ... which is fine */ | |
635 | if (!ret) | |
636 | list_del(&sta->list); | |
637 | spin_unlock_irqrestore(&local->sta_lock, flags); | |
638 | if (ret) | |
639 | return ret; | |
640 | ||
641 | if (sta->key) { | |
642 | ieee80211_key_free(sta->key); | |
643 | /* | |
644 | * We have only unlinked the key, and actually destroying it | |
645 | * may mean it is removed from hardware which requires that | |
646 | * the key->sta pointer is still valid, so flush the key todo | |
647 | * list here. | |
648 | * | |
649 | * ieee80211_key_todo() will synchronize_rcu() so after this | |
650 | * nothing can reference this sta struct any more. | |
651 | */ | |
652 | ieee80211_key_todo(); | |
653 | ||
654 | WARN_ON(sta->key); | |
655 | } | |
656 | ||
657 | sta->dead = true; | |
658 | ||
659 | if (test_and_clear_sta_flags(sta, | |
660 | WLAN_STA_PS_STA | WLAN_STA_PS_DRIVER)) { | |
661 | BUG_ON(!sdata->bss); | |
662 | ||
663 | atomic_dec(&sdata->bss->num_sta_ps); | |
664 | __sta_info_clear_tim_bit(sdata->bss, sta); | |
665 | } | |
666 | ||
667 | local->num_sta--; | |
668 | local->sta_generation++; | |
669 | ||
670 | if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) | |
671 | rcu_assign_pointer(sdata->u.vlan.sta, NULL); | |
672 | ||
673 | if (sta->uploaded) { | |
674 | if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) | |
675 | sdata = container_of(sdata->bss, | |
676 | struct ieee80211_sub_if_data, | |
677 | u.ap); | |
678 | drv_sta_remove(local, sdata, &sta->sta); | |
679 | sdata = sta->sdata; | |
680 | } | |
681 | ||
682 | #ifdef CONFIG_MAC80211_MESH | |
683 | if (ieee80211_vif_is_mesh(&sdata->vif)) { | |
684 | mesh_accept_plinks_update(sdata); | |
685 | del_timer(&sta->plink_timer); | |
686 | } | |
687 | #endif | |
688 | ||
689 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
690 | printk(KERN_DEBUG "%s: Removed STA %pM\n", | |
691 | wiphy_name(local->hw.wiphy), sta->sta.addr); | |
692 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ | |
693 | cancel_work_sync(&sta->drv_unblock_wk); | |
694 | ||
695 | rate_control_remove_sta_debugfs(sta); | |
696 | ieee80211_sta_debugfs_remove(sta); | |
697 | ||
698 | #ifdef CONFIG_MAC80211_MESH | |
699 | if (ieee80211_vif_is_mesh(&sta->sdata->vif)) { | |
700 | mesh_plink_deactivate(sta); | |
701 | del_timer_sync(&sta->plink_timer); | |
702 | } | |
703 | #endif | |
704 | ||
705 | while ((skb = skb_dequeue(&sta->ps_tx_buf)) != NULL) { | |
706 | local->total_ps_buffered--; | |
707 | dev_kfree_skb_any(skb); | |
708 | } | |
709 | ||
710 | while ((skb = skb_dequeue(&sta->tx_filtered)) != NULL) | |
711 | dev_kfree_skb_any(skb); | |
712 | ||
713 | for (i = 0; i < STA_TID_NUM; i++) { | |
714 | struct tid_ampdu_rx *tid_rx; | |
715 | struct tid_ampdu_tx *tid_tx; | |
716 | ||
717 | spin_lock_bh(&sta->lock); | |
718 | tid_rx = sta->ampdu_mlme.tid_rx[i]; | |
719 | /* Make sure timer won't free the tid_rx struct, see below */ | |
720 | if (tid_rx) | |
721 | tid_rx->shutdown = true; | |
722 | ||
723 | spin_unlock_bh(&sta->lock); | |
724 | ||
725 | /* | |
726 | * Outside spinlock - shutdown is true now so that the timer | |
727 | * won't free tid_rx, we have to do that now. Can't let the | |
728 | * timer do it because we have to sync the timer outside the | |
729 | * lock that it takes itself. | |
730 | */ | |
731 | if (tid_rx) { | |
732 | del_timer_sync(&tid_rx->session_timer); | |
733 | kfree(tid_rx); | |
734 | } | |
735 | ||
736 | /* | |
737 | * No need to do such complications for TX agg sessions, the | |
738 | * path leading to freeing the tid_tx struct goes via a call | |
739 | * from the driver, and thus needs to look up the sta struct | |
740 | * again, which cannot be found when we get here. Hence, we | |
741 | * just need to delete the timer and free the aggregation | |
742 | * info; we won't be telling the peer about it then but that | |
743 | * doesn't matter if we're not talking to it again anyway. | |
744 | */ | |
745 | tid_tx = sta->ampdu_mlme.tid_tx[i]; | |
746 | if (tid_tx) { | |
747 | del_timer_sync(&tid_tx->addba_resp_timer); | |
748 | /* | |
749 | * STA removed while aggregation session being | |
750 | * started? Bit odd, but purge frames anyway. | |
751 | */ | |
752 | skb_queue_purge(&tid_tx->pending); | |
753 | kfree(tid_tx); | |
754 | } | |
755 | } | |
756 | ||
757 | __sta_info_free(local, sta); | |
758 | ||
759 | return 0; | |
4d6141c3 JS |
760 | } |
761 | ||
34e89507 | 762 | int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, const u8 *addr) |
4d6141c3 | 763 | { |
34e89507 JB |
764 | struct sta_info *sta; |
765 | int ret; | |
4d6141c3 | 766 | |
34e89507 JB |
767 | mutex_lock(&sdata->local->sta_mtx); |
768 | sta = sta_info_get(sdata, addr); | |
769 | ret = __sta_info_destroy(sta); | |
770 | mutex_unlock(&sdata->local->sta_mtx); | |
4d6141c3 JS |
771 | |
772 | return ret; | |
773 | } | |
774 | ||
34e89507 JB |
775 | int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata, |
776 | const u8 *addr) | |
e9f207f0 | 777 | { |
34e89507 JB |
778 | struct sta_info *sta; |
779 | int ret; | |
e9f207f0 | 780 | |
34e89507 JB |
781 | mutex_lock(&sdata->local->sta_mtx); |
782 | sta = sta_info_get_bss(sdata, addr); | |
783 | ret = __sta_info_destroy(sta); | |
784 | mutex_unlock(&sdata->local->sta_mtx); | |
d0709a65 | 785 | |
34e89507 JB |
786 | return ret; |
787 | } | |
e9f207f0 | 788 | |
34e89507 JB |
789 | static void sta_info_cleanup(unsigned long data) |
790 | { | |
791 | struct ieee80211_local *local = (struct ieee80211_local *) data; | |
792 | struct sta_info *sta; | |
793 | ||
794 | rcu_read_lock(); | |
795 | list_for_each_entry_rcu(sta, &local->sta_list, list) | |
796 | sta_info_cleanup_expire_buffered(local, sta); | |
797 | rcu_read_unlock(); | |
e9f207f0 | 798 | |
34e89507 JB |
799 | if (local->quiescing) |
800 | return; | |
d0709a65 | 801 | |
34e89507 JB |
802 | local->sta_cleanup.expires = |
803 | round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL); | |
804 | add_timer(&local->sta_cleanup); | |
e9f207f0 | 805 | } |
e9f207f0 | 806 | |
f0706e82 JB |
807 | void sta_info_init(struct ieee80211_local *local) |
808 | { | |
d0709a65 | 809 | spin_lock_init(&local->sta_lock); |
34e89507 | 810 | mutex_init(&local->sta_mtx); |
f0706e82 | 811 | INIT_LIST_HEAD(&local->sta_list); |
34e89507 JB |
812 | INIT_LIST_HEAD(&local->sta_pending_list); |
813 | INIT_WORK(&local->sta_finish_work, sta_info_finish_work); | |
f0706e82 | 814 | |
b24b8a24 PE |
815 | setup_timer(&local->sta_cleanup, sta_info_cleanup, |
816 | (unsigned long)local); | |
0d174406 JB |
817 | local->sta_cleanup.expires = |
818 | round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL); | |
f0706e82 JB |
819 | } |
820 | ||
821 | int sta_info_start(struct ieee80211_local *local) | |
822 | { | |
823 | add_timer(&local->sta_cleanup); | |
824 | return 0; | |
825 | } | |
826 | ||
827 | void sta_info_stop(struct ieee80211_local *local) | |
828 | { | |
f0706e82 | 829 | del_timer(&local->sta_cleanup); |
be8755e1 | 830 | sta_info_flush(local, NULL); |
f0706e82 JB |
831 | } |
832 | ||
f0706e82 JB |
833 | /** |
834 | * sta_info_flush - flush matching STA entries from the STA table | |
44213b5e JB |
835 | * |
836 | * Returns the number of removed STA entries. | |
837 | * | |
f0706e82 | 838 | * @local: local interface data |
d0709a65 | 839 | * @sdata: matching rule for the net device (sta->dev) or %NULL to match all STAs |
f0706e82 | 840 | */ |
44213b5e | 841 | int sta_info_flush(struct ieee80211_local *local, |
af8cdcd8 | 842 | struct ieee80211_sub_if_data *sdata) |
f0706e82 JB |
843 | { |
844 | struct sta_info *sta, *tmp; | |
44213b5e | 845 | int ret = 0; |
f0706e82 | 846 | |
d0709a65 | 847 | might_sleep(); |
be8755e1 | 848 | |
34e89507 JB |
849 | mutex_lock(&local->sta_mtx); |
850 | ||
851 | sta_info_finish_pending(local); | |
852 | ||
d0709a65 | 853 | list_for_each_entry_safe(sta, tmp, &local->sta_list, list) { |
34e89507 JB |
854 | if (!sdata || sdata == sta->sdata) |
855 | WARN_ON(__sta_info_destroy(sta)); | |
be8755e1 | 856 | } |
34e89507 | 857 | mutex_unlock(&local->sta_mtx); |
44213b5e JB |
858 | |
859 | return ret; | |
f0706e82 | 860 | } |
dc6676b7 | 861 | |
24723d1b JB |
862 | void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata, |
863 | unsigned long exp_time) | |
864 | { | |
865 | struct ieee80211_local *local = sdata->local; | |
866 | struct sta_info *sta, *tmp; | |
24723d1b | 867 | |
34e89507 | 868 | mutex_lock(&local->sta_mtx); |
24723d1b JB |
869 | list_for_each_entry_safe(sta, tmp, &local->sta_list, list) |
870 | if (time_after(jiffies, sta->last_rx + exp_time)) { | |
871 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
0c68ae26 | 872 | printk(KERN_DEBUG "%s: expiring inactive STA %pM\n", |
47846c9b | 873 | sdata->name, sta->sta.addr); |
24723d1b | 874 | #endif |
34e89507 | 875 | WARN_ON(__sta_info_destroy(sta)); |
24723d1b | 876 | } |
34e89507 | 877 | mutex_unlock(&local->sta_mtx); |
24723d1b | 878 | } |
17741cdc | 879 | |
5ed176e1 JB |
880 | struct ieee80211_sta *ieee80211_find_sta_by_hw(struct ieee80211_hw *hw, |
881 | const u8 *addr) | |
17741cdc | 882 | { |
abe60632 | 883 | struct sta_info *sta, *nxt; |
17741cdc | 884 | |
abe60632 JB |
885 | /* Just return a random station ... first in list ... */ |
886 | for_each_sta_info(hw_to_local(hw), addr, sta, nxt) | |
887 | return &sta->sta; | |
888 | return NULL; | |
17741cdc | 889 | } |
5ed176e1 JB |
890 | EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_hw); |
891 | ||
892 | struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif, | |
893 | const u8 *addr) | |
894 | { | |
895 | struct ieee80211_sub_if_data *sdata; | |
896 | ||
897 | if (!vif) | |
898 | return NULL; | |
899 | ||
900 | sdata = vif_to_sdata(vif); | |
901 | ||
902 | return ieee80211_find_sta_by_hw(&sdata->local->hw, addr); | |
903 | } | |
17741cdc | 904 | EXPORT_SYMBOL(ieee80211_find_sta); |
af818581 JB |
905 | |
906 | /* powersave support code */ | |
907 | void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta) | |
908 | { | |
909 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
910 | struct ieee80211_local *local = sdata->local; | |
911 | int sent, buffered; | |
912 | ||
12375ef9 | 913 | drv_sta_notify(local, sdata, STA_NOTIFY_AWAKE, &sta->sta); |
af818581 JB |
914 | |
915 | if (!skb_queue_empty(&sta->ps_tx_buf)) | |
916 | sta_info_clear_tim_bit(sta); | |
917 | ||
918 | /* Send all buffered frames to the station */ | |
919 | sent = ieee80211_add_pending_skbs(local, &sta->tx_filtered); | |
920 | buffered = ieee80211_add_pending_skbs(local, &sta->ps_tx_buf); | |
921 | sent += buffered; | |
922 | local->total_ps_buffered -= buffered; | |
923 | ||
924 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
925 | printk(KERN_DEBUG "%s: STA %pM aid %d sending %d filtered/%d PS frames " | |
47846c9b | 926 | "since STA not sleeping anymore\n", sdata->name, |
af818581 JB |
927 | sta->sta.addr, sta->sta.aid, sent - buffered, buffered); |
928 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
929 | } | |
930 | ||
931 | void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta) | |
932 | { | |
933 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
934 | struct ieee80211_local *local = sdata->local; | |
935 | struct sk_buff *skb; | |
936 | int no_pending_pkts; | |
937 | ||
938 | skb = skb_dequeue(&sta->tx_filtered); | |
939 | if (!skb) { | |
940 | skb = skb_dequeue(&sta->ps_tx_buf); | |
941 | if (skb) | |
942 | local->total_ps_buffered--; | |
943 | } | |
944 | no_pending_pkts = skb_queue_empty(&sta->tx_filtered) && | |
945 | skb_queue_empty(&sta->ps_tx_buf); | |
946 | ||
947 | if (skb) { | |
948 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
949 | struct ieee80211_hdr *hdr = | |
950 | (struct ieee80211_hdr *) skb->data; | |
951 | ||
952 | /* | |
953 | * Tell TX path to send this frame even though the STA may | |
954 | * still remain is PS mode after this frame exchange. | |
955 | */ | |
956 | info->flags |= IEEE80211_TX_CTL_PSPOLL_RESPONSE; | |
957 | ||
958 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
959 | printk(KERN_DEBUG "STA %pM aid %d: PS Poll (entries after %d)\n", | |
960 | sta->sta.addr, sta->sta.aid, | |
961 | skb_queue_len(&sta->ps_tx_buf)); | |
962 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
963 | ||
964 | /* Use MoreData flag to indicate whether there are more | |
965 | * buffered frames for this STA */ | |
966 | if (no_pending_pkts) | |
967 | hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA); | |
968 | else | |
969 | hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA); | |
970 | ||
971 | ieee80211_add_pending_skb(local, skb); | |
972 | ||
973 | if (no_pending_pkts) | |
974 | sta_info_clear_tim_bit(sta); | |
975 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
976 | } else { | |
977 | /* | |
978 | * FIXME: This can be the result of a race condition between | |
979 | * us expiring a frame and the station polling for it. | |
980 | * Should we send it a null-func frame indicating we | |
981 | * have nothing buffered for it? | |
982 | */ | |
983 | printk(KERN_DEBUG "%s: STA %pM sent PS Poll even " | |
984 | "though there are no buffered frames for it\n", | |
47846c9b | 985 | sdata->name, sta->sta.addr); |
af818581 JB |
986 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
987 | } | |
988 | } | |
989 | ||
990 | void ieee80211_sta_block_awake(struct ieee80211_hw *hw, | |
991 | struct ieee80211_sta *pubsta, bool block) | |
992 | { | |
993 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); | |
994 | ||
995 | if (block) | |
996 | set_sta_flags(sta, WLAN_STA_PS_DRIVER); | |
997 | else | |
998 | ieee80211_queue_work(hw, &sta->drv_unblock_wk); | |
999 | } | |
1000 | EXPORT_SYMBOL(ieee80211_sta_block_awake); |