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Commit | Line | Data |
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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" | |
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 || | |
a2c1e3da | 128 | (sta->sdata->bss && sta->sdata->bss == sdata->bss)) && |
0e5ded5a FF |
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 | |
0fb9a9ec | 177 | wiphy_debug(local->hw.wiphy, "Destroyed STA %pM\n", sta->sta.addr); |
93e5deb1 JB |
178 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
179 | ||
180 | kfree(sta); | |
181 | } | |
182 | ||
d0709a65 JB |
183 | /* Caller must hold local->sta_lock */ |
184 | static void sta_info_hash_add(struct ieee80211_local *local, | |
185 | struct sta_info *sta) | |
f0706e82 | 186 | { |
17741cdc JB |
187 | sta->hnext = local->sta_hash[STA_HASH(sta->sta.addr)]; |
188 | rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)], sta); | |
f0706e82 | 189 | } |
f0706e82 | 190 | |
af818581 JB |
191 | static void sta_unblock(struct work_struct *wk) |
192 | { | |
193 | struct sta_info *sta; | |
194 | ||
195 | sta = container_of(wk, struct sta_info, drv_unblock_wk); | |
196 | ||
197 | if (sta->dead) | |
198 | return; | |
199 | ||
200 | if (!test_sta_flags(sta, WLAN_STA_PS_STA)) | |
201 | ieee80211_sta_ps_deliver_wakeup(sta); | |
202 | else if (test_and_clear_sta_flags(sta, WLAN_STA_PSPOLL)) | |
203 | ieee80211_sta_ps_deliver_poll_response(sta); | |
204 | } | |
205 | ||
af65cd96 JB |
206 | static int sta_prepare_rate_control(struct ieee80211_local *local, |
207 | struct sta_info *sta, gfp_t gfp) | |
208 | { | |
209 | if (local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL) | |
210 | return 0; | |
211 | ||
212 | sta->rate_ctrl = rate_control_get(local->rate_ctrl); | |
213 | sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl, | |
214 | &sta->sta, gfp); | |
215 | if (!sta->rate_ctrl_priv) { | |
216 | rate_control_put(sta->rate_ctrl); | |
217 | return -ENOMEM; | |
218 | } | |
219 | ||
220 | return 0; | |
221 | } | |
222 | ||
73651ee6 JB |
223 | struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata, |
224 | u8 *addr, gfp_t gfp) | |
f0706e82 | 225 | { |
d0709a65 | 226 | struct ieee80211_local *local = sdata->local; |
f0706e82 | 227 | struct sta_info *sta; |
16c5f15c | 228 | int i; |
f0706e82 | 229 | |
17741cdc | 230 | sta = kzalloc(sizeof(*sta) + local->hw.sta_data_size, gfp); |
f0706e82 | 231 | if (!sta) |
73651ee6 | 232 | return NULL; |
f0706e82 | 233 | |
07346f81 | 234 | spin_lock_init(&sta->lock); |
5a9f7b04 | 235 | spin_lock_init(&sta->flaglock); |
af818581 | 236 | INIT_WORK(&sta->drv_unblock_wk, sta_unblock); |
67c282c0 | 237 | INIT_WORK(&sta->ampdu_mlme.work, ieee80211_ba_session_work); |
a93e3644 | 238 | mutex_init(&sta->ampdu_mlme.mtx); |
07346f81 | 239 | |
17741cdc | 240 | memcpy(sta->sta.addr, addr, ETH_ALEN); |
d0709a65 JB |
241 | sta->local = local; |
242 | sta->sdata = sdata; | |
f0706e82 | 243 | |
af65cd96 | 244 | if (sta_prepare_rate_control(local, sta, gfp)) { |
f0706e82 | 245 | kfree(sta); |
73651ee6 | 246 | return NULL; |
f0706e82 JB |
247 | } |
248 | ||
16c5f15c | 249 | for (i = 0; i < STA_TID_NUM; i++) { |
a622ab72 JB |
250 | /* |
251 | * timer_to_tid must be initialized with identity mapping | |
252 | * to enable session_timer's data differentiation. See | |
253 | * sta_rx_agg_session_timer_expired for usage. | |
254 | */ | |
16c5f15c | 255 | sta->timer_to_tid[i] = i; |
16c5f15c | 256 | } |
f0706e82 JB |
257 | skb_queue_head_init(&sta->ps_tx_buf); |
258 | skb_queue_head_init(&sta->tx_filtered); | |
73651ee6 | 259 | |
cccaec98 | 260 | for (i = 0; i < NUM_RX_DATA_QUEUES; i++) |
4be929be | 261 | sta->last_seq_ctrl[i] = cpu_to_le16(USHRT_MAX); |
cccaec98 | 262 | |
73651ee6 | 263 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
0fb9a9ec | 264 | wiphy_debug(local->hw.wiphy, "Allocated STA %pM\n", sta->sta.addr); |
73651ee6 JB |
265 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
266 | ||
03e4497e | 267 | #ifdef CONFIG_MAC80211_MESH |
b4e08ea1 | 268 | sta->plink_state = PLINK_LISTEN; |
03e4497e JB |
269 | init_timer(&sta->plink_timer); |
270 | #endif | |
271 | ||
73651ee6 JB |
272 | return sta; |
273 | } | |
274 | ||
34e89507 | 275 | static int sta_info_finish_insert(struct sta_info *sta, bool async) |
73651ee6 JB |
276 | { |
277 | struct ieee80211_local *local = sta->local; | |
278 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
98b62183 | 279 | struct station_info sinfo; |
73651ee6 | 280 | unsigned long flags; |
93e5deb1 | 281 | int err = 0; |
73651ee6 | 282 | |
46a5ebaf | 283 | lockdep_assert_held(&local->sta_mtx); |
34e89507 JB |
284 | |
285 | /* notify driver */ | |
286 | if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) | |
287 | sdata = container_of(sdata->bss, | |
288 | struct ieee80211_sub_if_data, | |
289 | u.ap); | |
290 | err = drv_sta_add(local, sdata, &sta->sta); | |
291 | if (err) { | |
292 | if (!async) | |
293 | return err; | |
294 | printk(KERN_DEBUG "%s: failed to add IBSS STA %pM to driver (%d)" | |
295 | " - keeping it anyway.\n", | |
296 | sdata->name, sta->sta.addr, err); | |
297 | } else { | |
298 | sta->uploaded = true; | |
299 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
300 | if (async) | |
0fb9a9ec JP |
301 | wiphy_debug(local->hw.wiphy, |
302 | "Finished adding IBSS STA %pM\n", | |
303 | sta->sta.addr); | |
34e89507 JB |
304 | #endif |
305 | } | |
306 | ||
307 | sdata = sta->sdata; | |
308 | ||
309 | if (!async) { | |
310 | local->num_sta++; | |
311 | local->sta_generation++; | |
312 | smp_mb(); | |
313 | ||
314 | /* make the station visible */ | |
315 | spin_lock_irqsave(&local->sta_lock, flags); | |
316 | sta_info_hash_add(local, sta); | |
317 | spin_unlock_irqrestore(&local->sta_lock, flags); | |
318 | } | |
319 | ||
320 | list_add(&sta->list, &local->sta_list); | |
321 | ||
322 | ieee80211_sta_debugfs_add(sta); | |
323 | rate_control_add_sta_debugfs(sta); | |
324 | ||
325 | sinfo.filled = 0; | |
326 | sinfo.generation = local->sta_generation; | |
327 | cfg80211_new_sta(sdata->dev, sta->sta.addr, &sinfo, GFP_KERNEL); | |
328 | ||
329 | ||
330 | return 0; | |
331 | } | |
332 | ||
333 | static void sta_info_finish_pending(struct ieee80211_local *local) | |
334 | { | |
335 | struct sta_info *sta; | |
336 | unsigned long flags; | |
337 | ||
338 | spin_lock_irqsave(&local->sta_lock, flags); | |
339 | while (!list_empty(&local->sta_pending_list)) { | |
340 | sta = list_first_entry(&local->sta_pending_list, | |
341 | struct sta_info, list); | |
342 | list_del(&sta->list); | |
343 | spin_unlock_irqrestore(&local->sta_lock, flags); | |
344 | ||
345 | sta_info_finish_insert(sta, true); | |
346 | ||
347 | spin_lock_irqsave(&local->sta_lock, flags); | |
348 | } | |
349 | spin_unlock_irqrestore(&local->sta_lock, flags); | |
350 | } | |
351 | ||
352 | static void sta_info_finish_work(struct work_struct *work) | |
353 | { | |
354 | struct ieee80211_local *local = | |
355 | container_of(work, struct ieee80211_local, sta_finish_work); | |
356 | ||
357 | mutex_lock(&local->sta_mtx); | |
358 | sta_info_finish_pending(local); | |
359 | mutex_unlock(&local->sta_mtx); | |
360 | } | |
361 | ||
362 | int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU) | |
363 | { | |
364 | struct ieee80211_local *local = sta->local; | |
365 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
366 | unsigned long flags; | |
367 | int err = 0; | |
368 | ||
03e4497e JB |
369 | /* |
370 | * Can't be a WARN_ON because it can be triggered through a race: | |
371 | * something inserts a STA (on one CPU) without holding the RTNL | |
372 | * and another CPU turns off the net device. | |
373 | */ | |
9607e6b6 | 374 | if (unlikely(!ieee80211_sdata_running(sdata))) { |
93e5deb1 | 375 | err = -ENETDOWN; |
34e89507 | 376 | rcu_read_lock(); |
93e5deb1 JB |
377 | goto out_free; |
378 | } | |
03e4497e | 379 | |
47846c9b | 380 | if (WARN_ON(compare_ether_addr(sta->sta.addr, sdata->vif.addr) == 0 || |
c6a1fa12 | 381 | is_multicast_ether_addr(sta->sta.addr))) { |
93e5deb1 | 382 | err = -EINVAL; |
34e89507 | 383 | rcu_read_lock(); |
93e5deb1 JB |
384 | goto out_free; |
385 | } | |
44213b5e | 386 | |
34e89507 JB |
387 | /* |
388 | * In ad-hoc mode, we sometimes need to insert stations | |
389 | * from tasklet context from the RX path. To avoid races, | |
390 | * always do so in that case -- see the comment below. | |
391 | */ | |
392 | if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { | |
393 | spin_lock_irqsave(&local->sta_lock, flags); | |
394 | /* check if STA exists already */ | |
395 | if (sta_info_get_bss(sdata, sta->sta.addr)) { | |
396 | spin_unlock_irqrestore(&local->sta_lock, flags); | |
397 | rcu_read_lock(); | |
398 | err = -EEXIST; | |
399 | goto out_free; | |
400 | } | |
401 | ||
402 | local->num_sta++; | |
403 | local->sta_generation++; | |
404 | smp_mb(); | |
405 | sta_info_hash_add(local, sta); | |
406 | ||
407 | list_add_tail(&sta->list, &local->sta_pending_list); | |
408 | ||
409 | rcu_read_lock(); | |
410 | spin_unlock_irqrestore(&local->sta_lock, flags); | |
411 | ||
412 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
0fb9a9ec JP |
413 | wiphy_debug(local->hw.wiphy, "Added IBSS STA %pM\n", |
414 | sta->sta.addr); | |
34e89507 JB |
415 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
416 | ||
417 | ieee80211_queue_work(&local->hw, &local->sta_finish_work); | |
418 | ||
419 | return 0; | |
420 | } | |
421 | ||
422 | /* | |
423 | * On first glance, this will look racy, because the code | |
424 | * below this point, which inserts a station with sleeping, | |
425 | * unlocks the sta_lock between checking existence in the | |
426 | * hash table and inserting into it. | |
427 | * | |
428 | * However, it is not racy against itself because it keeps | |
429 | * the mutex locked. It still seems to race against the | |
430 | * above code that atomically inserts the station... That, | |
431 | * however, is not true because the above code can only | |
432 | * be invoked for IBSS interfaces, and the below code will | |
433 | * not be -- and the two do not race against each other as | |
434 | * the hash table also keys off the interface. | |
435 | */ | |
436 | ||
437 | might_sleep(); | |
438 | ||
439 | mutex_lock(&local->sta_mtx); | |
440 | ||
d0709a65 | 441 | spin_lock_irqsave(&local->sta_lock, flags); |
43ba7e95 | 442 | /* check if STA exists already */ |
34e89507 | 443 | if (sta_info_get_bss(sdata, sta->sta.addr)) { |
d0709a65 | 444 | spin_unlock_irqrestore(&local->sta_lock, flags); |
38a679a5 | 445 | mutex_unlock(&local->sta_mtx); |
34e89507 | 446 | rcu_read_lock(); |
93e5deb1 JB |
447 | err = -EEXIST; |
448 | goto out_free; | |
43ba7e95 | 449 | } |
32bfd35d | 450 | |
34e89507 | 451 | spin_unlock_irqrestore(&local->sta_lock, flags); |
32bfd35d | 452 | |
34e89507 JB |
453 | err = sta_info_finish_insert(sta, false); |
454 | if (err) { | |
455 | mutex_unlock(&local->sta_mtx); | |
456 | rcu_read_lock(); | |
457 | goto out_free; | |
32bfd35d | 458 | } |
d0709a65 | 459 | |
f0706e82 | 460 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
0fb9a9ec | 461 | wiphy_debug(local->hw.wiphy, "Inserted STA %pM\n", sta->sta.addr); |
f0706e82 JB |
462 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
463 | ||
34e89507 JB |
464 | /* move reference to rcu-protected */ |
465 | rcu_read_lock(); | |
466 | mutex_unlock(&local->sta_mtx); | |
e9f207f0 | 467 | |
73651ee6 JB |
468 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
469 | mesh_accept_plinks_update(sdata); | |
470 | ||
471 | return 0; | |
93e5deb1 JB |
472 | out_free: |
473 | BUG_ON(!err); | |
474 | __sta_info_free(local, sta); | |
475 | return err; | |
f0706e82 JB |
476 | } |
477 | ||
34e89507 JB |
478 | int sta_info_insert(struct sta_info *sta) |
479 | { | |
480 | int err = sta_info_insert_rcu(sta); | |
481 | ||
482 | rcu_read_unlock(); | |
483 | ||
484 | return err; | |
485 | } | |
486 | ||
004c872e JB |
487 | static inline void __bss_tim_set(struct ieee80211_if_ap *bss, u16 aid) |
488 | { | |
489 | /* | |
490 | * This format has been mandated by the IEEE specifications, | |
491 | * so this line may not be changed to use the __set_bit() format. | |
492 | */ | |
493 | bss->tim[aid / 8] |= (1 << (aid % 8)); | |
494 | } | |
495 | ||
496 | static inline void __bss_tim_clear(struct ieee80211_if_ap *bss, u16 aid) | |
497 | { | |
498 | /* | |
499 | * This format has been mandated by the IEEE specifications, | |
500 | * so this line may not be changed to use the __clear_bit() format. | |
501 | */ | |
502 | bss->tim[aid / 8] &= ~(1 << (aid % 8)); | |
503 | } | |
504 | ||
505 | static void __sta_info_set_tim_bit(struct ieee80211_if_ap *bss, | |
506 | struct sta_info *sta) | |
507 | { | |
3e122be0 JB |
508 | BUG_ON(!bss); |
509 | ||
17741cdc | 510 | __bss_tim_set(bss, sta->sta.aid); |
3e122be0 | 511 | |
d0709a65 JB |
512 | if (sta->local->ops->set_tim) { |
513 | sta->local->tim_in_locked_section = true; | |
24487981 | 514 | drv_set_tim(sta->local, &sta->sta, true); |
d0709a65 JB |
515 | sta->local->tim_in_locked_section = false; |
516 | } | |
004c872e JB |
517 | } |
518 | ||
519 | void sta_info_set_tim_bit(struct sta_info *sta) | |
520 | { | |
d0709a65 | 521 | unsigned long flags; |
004c872e | 522 | |
3e122be0 JB |
523 | BUG_ON(!sta->sdata->bss); |
524 | ||
d0709a65 JB |
525 | spin_lock_irqsave(&sta->local->sta_lock, flags); |
526 | __sta_info_set_tim_bit(sta->sdata->bss, sta); | |
527 | spin_unlock_irqrestore(&sta->local->sta_lock, flags); | |
004c872e JB |
528 | } |
529 | ||
530 | static void __sta_info_clear_tim_bit(struct ieee80211_if_ap *bss, | |
531 | struct sta_info *sta) | |
532 | { | |
3e122be0 JB |
533 | BUG_ON(!bss); |
534 | ||
17741cdc | 535 | __bss_tim_clear(bss, sta->sta.aid); |
3e122be0 | 536 | |
d0709a65 JB |
537 | if (sta->local->ops->set_tim) { |
538 | sta->local->tim_in_locked_section = true; | |
24487981 | 539 | drv_set_tim(sta->local, &sta->sta, false); |
d0709a65 JB |
540 | sta->local->tim_in_locked_section = false; |
541 | } | |
004c872e JB |
542 | } |
543 | ||
544 | void sta_info_clear_tim_bit(struct sta_info *sta) | |
545 | { | |
d0709a65 | 546 | unsigned long flags; |
004c872e | 547 | |
3e122be0 JB |
548 | BUG_ON(!sta->sdata->bss); |
549 | ||
d0709a65 JB |
550 | spin_lock_irqsave(&sta->local->sta_lock, flags); |
551 | __sta_info_clear_tim_bit(sta->sdata->bss, sta); | |
552 | spin_unlock_irqrestore(&sta->local->sta_lock, flags); | |
004c872e JB |
553 | } |
554 | ||
57c4d7b4 JB |
555 | static int sta_info_buffer_expired(struct sta_info *sta, |
556 | struct sk_buff *skb) | |
f0706e82 | 557 | { |
e039fa4a | 558 | struct ieee80211_tx_info *info; |
f0706e82 JB |
559 | int timeout; |
560 | ||
561 | if (!skb) | |
562 | return 0; | |
563 | ||
e039fa4a | 564 | info = IEEE80211_SKB_CB(skb); |
f0706e82 JB |
565 | |
566 | /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */ | |
57c4d7b4 JB |
567 | timeout = (sta->listen_interval * |
568 | sta->sdata->vif.bss_conf.beacon_int * | |
569 | 32 / 15625) * HZ; | |
f0706e82 JB |
570 | if (timeout < STA_TX_BUFFER_EXPIRE) |
571 | timeout = STA_TX_BUFFER_EXPIRE; | |
e039fa4a | 572 | return time_after(jiffies, info->control.jiffies + timeout); |
f0706e82 JB |
573 | } |
574 | ||
575 | ||
3393a608 | 576 | static bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local, |
f0706e82 JB |
577 | struct sta_info *sta) |
578 | { | |
579 | unsigned long flags; | |
580 | struct sk_buff *skb; | |
836341a7 | 581 | struct ieee80211_sub_if_data *sdata; |
f0706e82 JB |
582 | |
583 | if (skb_queue_empty(&sta->ps_tx_buf)) | |
3393a608 | 584 | return false; |
f0706e82 JB |
585 | |
586 | for (;;) { | |
587 | spin_lock_irqsave(&sta->ps_tx_buf.lock, flags); | |
588 | skb = skb_peek(&sta->ps_tx_buf); | |
57c4d7b4 | 589 | if (sta_info_buffer_expired(sta, skb)) |
f0706e82 | 590 | skb = __skb_dequeue(&sta->ps_tx_buf); |
836341a7 | 591 | else |
f0706e82 JB |
592 | skb = NULL; |
593 | spin_unlock_irqrestore(&sta->ps_tx_buf.lock, flags); | |
594 | ||
836341a7 | 595 | if (!skb) |
f0706e82 | 596 | break; |
836341a7 | 597 | |
d0709a65 | 598 | sdata = sta->sdata; |
836341a7 | 599 | local->total_ps_buffered--; |
f4ea83dd | 600 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 JB |
601 | printk(KERN_DEBUG "Buffered frame expired (STA %pM)\n", |
602 | sta->sta.addr); | |
f4ea83dd | 603 | #endif |
836341a7 JB |
604 | dev_kfree_skb(skb); |
605 | ||
004c872e JB |
606 | if (skb_queue_empty(&sta->ps_tx_buf)) |
607 | sta_info_clear_tim_bit(sta); | |
f0706e82 | 608 | } |
3393a608 JO |
609 | |
610 | return true; | |
f0706e82 JB |
611 | } |
612 | ||
34e89507 | 613 | static int __must_check __sta_info_destroy(struct sta_info *sta) |
f0706e82 | 614 | { |
34e89507 JB |
615 | struct ieee80211_local *local; |
616 | struct ieee80211_sub_if_data *sdata; | |
617 | struct sk_buff *skb; | |
618 | unsigned long flags; | |
e31b8213 | 619 | int ret, i; |
f0706e82 | 620 | |
34e89507 | 621 | might_sleep(); |
f0706e82 | 622 | |
34e89507 JB |
623 | if (!sta) |
624 | return -ENOENT; | |
5bb644a0 | 625 | |
34e89507 JB |
626 | local = sta->local; |
627 | sdata = sta->sdata; | |
f0706e82 | 628 | |
098a6070 JB |
629 | /* |
630 | * Before removing the station from the driver and | |
631 | * rate control, it might still start new aggregation | |
632 | * sessions -- block that to make sure the tear-down | |
633 | * will be sufficient. | |
634 | */ | |
635 | set_sta_flags(sta, WLAN_STA_BLOCK_BA); | |
53f73c09 | 636 | ieee80211_sta_tear_down_BA_sessions(sta, true); |
098a6070 | 637 | |
34e89507 JB |
638 | spin_lock_irqsave(&local->sta_lock, flags); |
639 | ret = sta_info_hash_del(local, sta); | |
640 | /* this might still be the pending list ... which is fine */ | |
641 | if (!ret) | |
642 | list_del(&sta->list); | |
643 | spin_unlock_irqrestore(&local->sta_lock, flags); | |
644 | if (ret) | |
645 | return ret; | |
646 | ||
e31b8213 JB |
647 | for (i = 0; i < NUM_DEFAULT_KEYS; i++) |
648 | ieee80211_key_free(local, sta->gtk[i]); | |
649 | if (sta->ptk) | |
650 | ieee80211_key_free(local, sta->ptk); | |
34e89507 JB |
651 | |
652 | sta->dead = true; | |
653 | ||
654 | if (test_and_clear_sta_flags(sta, | |
655 | WLAN_STA_PS_STA | WLAN_STA_PS_DRIVER)) { | |
656 | BUG_ON(!sdata->bss); | |
657 | ||
658 | atomic_dec(&sdata->bss->num_sta_ps); | |
659 | __sta_info_clear_tim_bit(sdata->bss, sta); | |
660 | } | |
661 | ||
662 | local->num_sta--; | |
663 | local->sta_generation++; | |
664 | ||
665 | if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) | |
666 | rcu_assign_pointer(sdata->u.vlan.sta, NULL); | |
667 | ||
668 | if (sta->uploaded) { | |
669 | if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) | |
670 | sdata = container_of(sdata->bss, | |
671 | struct ieee80211_sub_if_data, | |
672 | u.ap); | |
673 | drv_sta_remove(local, sdata, &sta->sta); | |
674 | sdata = sta->sdata; | |
675 | } | |
676 | ||
e64b3795 JB |
677 | /* |
678 | * At this point, after we wait for an RCU grace period, | |
679 | * neither mac80211 nor the driver can reference this | |
680 | * sta struct any more except by still existing timers | |
681 | * associated with this station that we clean up below. | |
682 | */ | |
683 | synchronize_rcu(); | |
684 | ||
34e89507 | 685 | #ifdef CONFIG_MAC80211_MESH |
e64b3795 | 686 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
34e89507 | 687 | mesh_accept_plinks_update(sdata); |
34e89507 JB |
688 | #endif |
689 | ||
690 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
0fb9a9ec | 691 | wiphy_debug(local->hw.wiphy, "Removed STA %pM\n", sta->sta.addr); |
34e89507 JB |
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 | ||
34e89507 JB |
713 | __sta_info_free(local, sta); |
714 | ||
715 | return 0; | |
4d6141c3 JS |
716 | } |
717 | ||
34e89507 | 718 | int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, const u8 *addr) |
4d6141c3 | 719 | { |
34e89507 JB |
720 | struct sta_info *sta; |
721 | int ret; | |
4d6141c3 | 722 | |
34e89507 JB |
723 | mutex_lock(&sdata->local->sta_mtx); |
724 | sta = sta_info_get(sdata, addr); | |
725 | ret = __sta_info_destroy(sta); | |
726 | mutex_unlock(&sdata->local->sta_mtx); | |
4d6141c3 JS |
727 | |
728 | return ret; | |
729 | } | |
730 | ||
34e89507 JB |
731 | int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata, |
732 | const u8 *addr) | |
e9f207f0 | 733 | { |
34e89507 JB |
734 | struct sta_info *sta; |
735 | int ret; | |
e9f207f0 | 736 | |
34e89507 JB |
737 | mutex_lock(&sdata->local->sta_mtx); |
738 | sta = sta_info_get_bss(sdata, addr); | |
739 | ret = __sta_info_destroy(sta); | |
740 | mutex_unlock(&sdata->local->sta_mtx); | |
d0709a65 | 741 | |
34e89507 JB |
742 | return ret; |
743 | } | |
e9f207f0 | 744 | |
34e89507 JB |
745 | static void sta_info_cleanup(unsigned long data) |
746 | { | |
747 | struct ieee80211_local *local = (struct ieee80211_local *) data; | |
748 | struct sta_info *sta; | |
3393a608 | 749 | bool timer_needed = false; |
34e89507 JB |
750 | |
751 | rcu_read_lock(); | |
752 | list_for_each_entry_rcu(sta, &local->sta_list, list) | |
3393a608 JO |
753 | if (sta_info_cleanup_expire_buffered(local, sta)) |
754 | timer_needed = true; | |
34e89507 | 755 | rcu_read_unlock(); |
e9f207f0 | 756 | |
34e89507 JB |
757 | if (local->quiescing) |
758 | return; | |
d0709a65 | 759 | |
3393a608 JO |
760 | if (!timer_needed) |
761 | return; | |
762 | ||
34e89507 JB |
763 | local->sta_cleanup.expires = |
764 | round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL); | |
765 | add_timer(&local->sta_cleanup); | |
e9f207f0 | 766 | } |
e9f207f0 | 767 | |
f0706e82 JB |
768 | void sta_info_init(struct ieee80211_local *local) |
769 | { | |
d0709a65 | 770 | spin_lock_init(&local->sta_lock); |
34e89507 | 771 | mutex_init(&local->sta_mtx); |
f0706e82 | 772 | INIT_LIST_HEAD(&local->sta_list); |
34e89507 JB |
773 | INIT_LIST_HEAD(&local->sta_pending_list); |
774 | INIT_WORK(&local->sta_finish_work, sta_info_finish_work); | |
f0706e82 | 775 | |
b24b8a24 PE |
776 | setup_timer(&local->sta_cleanup, sta_info_cleanup, |
777 | (unsigned long)local); | |
0d174406 JB |
778 | local->sta_cleanup.expires = |
779 | round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL); | |
f0706e82 JB |
780 | } |
781 | ||
782 | int sta_info_start(struct ieee80211_local *local) | |
783 | { | |
784 | add_timer(&local->sta_cleanup); | |
785 | return 0; | |
786 | } | |
787 | ||
788 | void sta_info_stop(struct ieee80211_local *local) | |
789 | { | |
f0706e82 | 790 | del_timer(&local->sta_cleanup); |
be8755e1 | 791 | sta_info_flush(local, NULL); |
f0706e82 JB |
792 | } |
793 | ||
f0706e82 JB |
794 | /** |
795 | * sta_info_flush - flush matching STA entries from the STA table | |
44213b5e JB |
796 | * |
797 | * Returns the number of removed STA entries. | |
798 | * | |
f0706e82 | 799 | * @local: local interface data |
d0709a65 | 800 | * @sdata: matching rule for the net device (sta->dev) or %NULL to match all STAs |
f0706e82 | 801 | */ |
44213b5e | 802 | int sta_info_flush(struct ieee80211_local *local, |
af8cdcd8 | 803 | struct ieee80211_sub_if_data *sdata) |
f0706e82 JB |
804 | { |
805 | struct sta_info *sta, *tmp; | |
44213b5e | 806 | int ret = 0; |
f0706e82 | 807 | |
d0709a65 | 808 | might_sleep(); |
be8755e1 | 809 | |
34e89507 JB |
810 | mutex_lock(&local->sta_mtx); |
811 | ||
812 | sta_info_finish_pending(local); | |
813 | ||
d0709a65 | 814 | list_for_each_entry_safe(sta, tmp, &local->sta_list, list) { |
34e89507 JB |
815 | if (!sdata || sdata == sta->sdata) |
816 | WARN_ON(__sta_info_destroy(sta)); | |
be8755e1 | 817 | } |
34e89507 | 818 | mutex_unlock(&local->sta_mtx); |
44213b5e JB |
819 | |
820 | return ret; | |
f0706e82 | 821 | } |
dc6676b7 | 822 | |
24723d1b JB |
823 | void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata, |
824 | unsigned long exp_time) | |
825 | { | |
826 | struct ieee80211_local *local = sdata->local; | |
827 | struct sta_info *sta, *tmp; | |
24723d1b | 828 | |
34e89507 | 829 | mutex_lock(&local->sta_mtx); |
24723d1b JB |
830 | list_for_each_entry_safe(sta, tmp, &local->sta_list, list) |
831 | if (time_after(jiffies, sta->last_rx + exp_time)) { | |
832 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
0c68ae26 | 833 | printk(KERN_DEBUG "%s: expiring inactive STA %pM\n", |
47846c9b | 834 | sdata->name, sta->sta.addr); |
24723d1b | 835 | #endif |
34e89507 | 836 | WARN_ON(__sta_info_destroy(sta)); |
24723d1b | 837 | } |
34e89507 | 838 | mutex_unlock(&local->sta_mtx); |
24723d1b | 839 | } |
17741cdc | 840 | |
686b9cb9 BG |
841 | struct ieee80211_sta *ieee80211_find_sta_by_ifaddr(struct ieee80211_hw *hw, |
842 | const u8 *addr, | |
843 | const u8 *localaddr) | |
17741cdc | 844 | { |
abe60632 | 845 | struct sta_info *sta, *nxt; |
17741cdc | 846 | |
686b9cb9 BG |
847 | /* |
848 | * Just return a random station if localaddr is NULL | |
849 | * ... first in list. | |
850 | */ | |
f7c65594 | 851 | for_each_sta_info(hw_to_local(hw), addr, sta, nxt) { |
686b9cb9 BG |
852 | if (localaddr && |
853 | compare_ether_addr(sta->sdata->vif.addr, localaddr) != 0) | |
854 | continue; | |
f7c65594 JB |
855 | if (!sta->uploaded) |
856 | return NULL; | |
abe60632 | 857 | return &sta->sta; |
f7c65594 JB |
858 | } |
859 | ||
abe60632 | 860 | return NULL; |
17741cdc | 861 | } |
686b9cb9 | 862 | EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr); |
5ed176e1 JB |
863 | |
864 | struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif, | |
865 | const u8 *addr) | |
866 | { | |
f7c65594 | 867 | struct sta_info *sta; |
5ed176e1 JB |
868 | |
869 | if (!vif) | |
870 | return NULL; | |
871 | ||
f7c65594 JB |
872 | sta = sta_info_get_bss(vif_to_sdata(vif), addr); |
873 | if (!sta) | |
874 | return NULL; | |
875 | ||
876 | if (!sta->uploaded) | |
877 | return NULL; | |
5ed176e1 | 878 | |
f7c65594 | 879 | return &sta->sta; |
5ed176e1 | 880 | } |
17741cdc | 881 | EXPORT_SYMBOL(ieee80211_find_sta); |
af818581 JB |
882 | |
883 | /* powersave support code */ | |
884 | void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta) | |
885 | { | |
886 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
887 | struct ieee80211_local *local = sdata->local; | |
888 | int sent, buffered; | |
889 | ||
12375ef9 | 890 | drv_sta_notify(local, sdata, STA_NOTIFY_AWAKE, &sta->sta); |
af818581 JB |
891 | |
892 | if (!skb_queue_empty(&sta->ps_tx_buf)) | |
893 | sta_info_clear_tim_bit(sta); | |
894 | ||
895 | /* Send all buffered frames to the station */ | |
896 | sent = ieee80211_add_pending_skbs(local, &sta->tx_filtered); | |
897 | buffered = ieee80211_add_pending_skbs(local, &sta->ps_tx_buf); | |
898 | sent += buffered; | |
899 | local->total_ps_buffered -= buffered; | |
900 | ||
901 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
902 | printk(KERN_DEBUG "%s: STA %pM aid %d sending %d filtered/%d PS frames " | |
47846c9b | 903 | "since STA not sleeping anymore\n", sdata->name, |
af818581 JB |
904 | sta->sta.addr, sta->sta.aid, sent - buffered, buffered); |
905 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
906 | } | |
907 | ||
908 | void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta) | |
909 | { | |
910 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
911 | struct ieee80211_local *local = sdata->local; | |
912 | struct sk_buff *skb; | |
913 | int no_pending_pkts; | |
914 | ||
915 | skb = skb_dequeue(&sta->tx_filtered); | |
916 | if (!skb) { | |
917 | skb = skb_dequeue(&sta->ps_tx_buf); | |
918 | if (skb) | |
919 | local->total_ps_buffered--; | |
920 | } | |
921 | no_pending_pkts = skb_queue_empty(&sta->tx_filtered) && | |
922 | skb_queue_empty(&sta->ps_tx_buf); | |
923 | ||
924 | if (skb) { | |
925 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
926 | struct ieee80211_hdr *hdr = | |
927 | (struct ieee80211_hdr *) skb->data; | |
928 | ||
929 | /* | |
930 | * Tell TX path to send this frame even though the STA may | |
931 | * still remain is PS mode after this frame exchange. | |
932 | */ | |
933 | info->flags |= IEEE80211_TX_CTL_PSPOLL_RESPONSE; | |
934 | ||
935 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
936 | printk(KERN_DEBUG "STA %pM aid %d: PS Poll (entries after %d)\n", | |
937 | sta->sta.addr, sta->sta.aid, | |
938 | skb_queue_len(&sta->ps_tx_buf)); | |
939 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
940 | ||
941 | /* Use MoreData flag to indicate whether there are more | |
942 | * buffered frames for this STA */ | |
943 | if (no_pending_pkts) | |
944 | hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA); | |
945 | else | |
946 | hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA); | |
947 | ||
948 | ieee80211_add_pending_skb(local, skb); | |
949 | ||
950 | if (no_pending_pkts) | |
951 | sta_info_clear_tim_bit(sta); | |
952 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
953 | } else { | |
954 | /* | |
955 | * FIXME: This can be the result of a race condition between | |
956 | * us expiring a frame and the station polling for it. | |
957 | * Should we send it a null-func frame indicating we | |
958 | * have nothing buffered for it? | |
959 | */ | |
960 | printk(KERN_DEBUG "%s: STA %pM sent PS Poll even " | |
961 | "though there are no buffered frames for it\n", | |
47846c9b | 962 | sdata->name, sta->sta.addr); |
af818581 JB |
963 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
964 | } | |
965 | } | |
966 | ||
967 | void ieee80211_sta_block_awake(struct ieee80211_hw *hw, | |
968 | struct ieee80211_sta *pubsta, bool block) | |
969 | { | |
970 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); | |
971 | ||
b5878a2d JB |
972 | trace_api_sta_block_awake(sta->local, pubsta, block); |
973 | ||
af818581 JB |
974 | if (block) |
975 | set_sta_flags(sta, WLAN_STA_PS_DRIVER); | |
976 | else | |
977 | ieee80211_queue_work(hw, &sta->drv_unblock_wk); | |
978 | } | |
979 | EXPORT_SYMBOL(ieee80211_sta_block_awake); |