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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 | |
25985edc | 50 | * receive an association response from the AP. For IBSS this occurs when |
34e89507 | 51 | * get to know about a peer on the same IBSS. For WDS we add the sta for |
25985edc | 52 | * the peer immediately upon device open. When using AP mode we add stations |
34e89507 | 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 | ||
40b275b6 JB |
70 | s = rcu_dereference_protected(local->sta_hash[STA_HASH(sta->sta.addr)], |
71 | lockdep_is_held(&local->sta_lock)); | |
f0706e82 | 72 | if (!s) |
be8755e1 MW |
73 | return -ENOENT; |
74 | if (s == sta) { | |
17741cdc | 75 | rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)], |
d0709a65 | 76 | s->hnext); |
be8755e1 | 77 | return 0; |
f0706e82 JB |
78 | } |
79 | ||
40b275b6 JB |
80 | while (rcu_access_pointer(s->hnext) && |
81 | rcu_access_pointer(s->hnext) != sta) | |
82 | s = rcu_dereference_protected(s->hnext, | |
83 | lockdep_is_held(&local->sta_lock)); | |
84 | if (rcu_access_pointer(s->hnext)) { | |
d0709a65 | 85 | rcu_assign_pointer(s->hnext, sta->hnext); |
be8755e1 MW |
86 | return 0; |
87 | } | |
f0706e82 | 88 | |
be8755e1 | 89 | return -ENOENT; |
f0706e82 JB |
90 | } |
91 | ||
d0709a65 | 92 | /* protected by RCU */ |
abe60632 JB |
93 | struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata, |
94 | const u8 *addr) | |
f0706e82 | 95 | { |
abe60632 | 96 | struct ieee80211_local *local = sdata->local; |
f0706e82 JB |
97 | struct sta_info *sta; |
98 | ||
2a33bee2 GE |
99 | sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)], |
100 | lockdep_is_held(&local->sta_lock) || | |
101 | lockdep_is_held(&local->sta_mtx)); | |
102 | while (sta) { | |
103 | if (sta->sdata == sdata && !sta->dummy && | |
104 | memcmp(sta->sta.addr, addr, ETH_ALEN) == 0) | |
105 | break; | |
106 | sta = rcu_dereference_check(sta->hnext, | |
107 | lockdep_is_held(&local->sta_lock) || | |
108 | lockdep_is_held(&local->sta_mtx)); | |
109 | } | |
110 | return sta; | |
111 | } | |
112 | ||
113 | /* get a station info entry even if it is a dummy station*/ | |
114 | struct sta_info *sta_info_get_rx(struct ieee80211_sub_if_data *sdata, | |
115 | const u8 *addr) | |
116 | { | |
117 | struct ieee80211_local *local = sdata->local; | |
118 | struct sta_info *sta; | |
119 | ||
0379185b | 120 | sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)], |
0379185b JB |
121 | lockdep_is_held(&local->sta_lock) || |
122 | lockdep_is_held(&local->sta_mtx)); | |
f0706e82 | 123 | while (sta) { |
abe60632 JB |
124 | if (sta->sdata == sdata && |
125 | memcmp(sta->sta.addr, addr, ETH_ALEN) == 0) | |
f0706e82 | 126 | break; |
0379185b | 127 | sta = rcu_dereference_check(sta->hnext, |
0379185b JB |
128 | lockdep_is_held(&local->sta_lock) || |
129 | lockdep_is_held(&local->sta_mtx)); | |
f0706e82 | 130 | } |
43ba7e95 JB |
131 | return sta; |
132 | } | |
133 | ||
0e5ded5a FF |
134 | /* |
135 | * Get sta info either from the specified interface | |
136 | * or from one of its vlans | |
137 | */ | |
138 | struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata, | |
139 | const u8 *addr) | |
140 | { | |
141 | struct ieee80211_local *local = sdata->local; | |
142 | struct sta_info *sta; | |
143 | ||
2a33bee2 GE |
144 | sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)], |
145 | lockdep_is_held(&local->sta_lock) || | |
146 | lockdep_is_held(&local->sta_mtx)); | |
147 | while (sta) { | |
148 | if ((sta->sdata == sdata || | |
149 | (sta->sdata->bss && sta->sdata->bss == sdata->bss)) && | |
150 | !sta->dummy && | |
151 | memcmp(sta->sta.addr, addr, ETH_ALEN) == 0) | |
152 | break; | |
153 | sta = rcu_dereference_check(sta->hnext, | |
154 | lockdep_is_held(&local->sta_lock) || | |
155 | lockdep_is_held(&local->sta_mtx)); | |
156 | } | |
157 | return sta; | |
158 | } | |
159 | ||
160 | /* | |
161 | * Get sta info either from the specified interface | |
162 | * or from one of its vlans (including dummy stations) | |
163 | */ | |
164 | struct sta_info *sta_info_get_bss_rx(struct ieee80211_sub_if_data *sdata, | |
165 | const u8 *addr) | |
166 | { | |
167 | struct ieee80211_local *local = sdata->local; | |
168 | struct sta_info *sta; | |
169 | ||
0379185b | 170 | sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)], |
0379185b JB |
171 | lockdep_is_held(&local->sta_lock) || |
172 | lockdep_is_held(&local->sta_mtx)); | |
0e5ded5a FF |
173 | while (sta) { |
174 | if ((sta->sdata == sdata || | |
a2c1e3da | 175 | (sta->sdata->bss && sta->sdata->bss == sdata->bss)) && |
0e5ded5a FF |
176 | memcmp(sta->sta.addr, addr, ETH_ALEN) == 0) |
177 | break; | |
0379185b | 178 | sta = rcu_dereference_check(sta->hnext, |
0379185b JB |
179 | lockdep_is_held(&local->sta_lock) || |
180 | lockdep_is_held(&local->sta_mtx)); | |
0e5ded5a FF |
181 | } |
182 | return sta; | |
183 | } | |
184 | ||
3b53fde8 JB |
185 | struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata, |
186 | int idx) | |
ee385855 | 187 | { |
3b53fde8 | 188 | struct ieee80211_local *local = sdata->local; |
ee385855 LCC |
189 | struct sta_info *sta; |
190 | int i = 0; | |
191 | ||
d0709a65 | 192 | list_for_each_entry_rcu(sta, &local->sta_list, list) { |
3b53fde8 | 193 | if (sdata != sta->sdata) |
2a8ca29a | 194 | continue; |
ee385855 LCC |
195 | if (i < idx) { |
196 | ++i; | |
197 | continue; | |
ee385855 | 198 | } |
2a8ca29a | 199 | return sta; |
ee385855 | 200 | } |
ee385855 LCC |
201 | |
202 | return NULL; | |
203 | } | |
f0706e82 | 204 | |
93e5deb1 JB |
205 | /** |
206 | * __sta_info_free - internal STA free helper | |
207 | * | |
6ef307bc | 208 | * @local: pointer to the global information |
93e5deb1 JB |
209 | * @sta: STA info to free |
210 | * | |
211 | * This function must undo everything done by sta_info_alloc() | |
212 | * that may happen before sta_info_insert(). | |
213 | */ | |
214 | static void __sta_info_free(struct ieee80211_local *local, | |
215 | struct sta_info *sta) | |
216 | { | |
af65cd96 JB |
217 | if (sta->rate_ctrl) { |
218 | rate_control_free_sta(sta); | |
219 | rate_control_put(sta->rate_ctrl); | |
220 | } | |
93e5deb1 JB |
221 | |
222 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
0fb9a9ec | 223 | wiphy_debug(local->hw.wiphy, "Destroyed STA %pM\n", sta->sta.addr); |
93e5deb1 JB |
224 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
225 | ||
226 | kfree(sta); | |
227 | } | |
228 | ||
d0709a65 JB |
229 | /* Caller must hold local->sta_lock */ |
230 | static void sta_info_hash_add(struct ieee80211_local *local, | |
231 | struct sta_info *sta) | |
f0706e82 | 232 | { |
17741cdc JB |
233 | sta->hnext = local->sta_hash[STA_HASH(sta->sta.addr)]; |
234 | rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)], sta); | |
f0706e82 | 235 | } |
f0706e82 | 236 | |
af818581 JB |
237 | static void sta_unblock(struct work_struct *wk) |
238 | { | |
239 | struct sta_info *sta; | |
240 | ||
241 | sta = container_of(wk, struct sta_info, drv_unblock_wk); | |
242 | ||
243 | if (sta->dead) | |
244 | return; | |
245 | ||
246 | if (!test_sta_flags(sta, WLAN_STA_PS_STA)) | |
247 | ieee80211_sta_ps_deliver_wakeup(sta); | |
50a9432d JB |
248 | else if (test_and_clear_sta_flags(sta, WLAN_STA_PSPOLL)) { |
249 | clear_sta_flags(sta, WLAN_STA_PS_DRIVER); | |
af818581 | 250 | ieee80211_sta_ps_deliver_poll_response(sta); |
50a9432d JB |
251 | } else |
252 | clear_sta_flags(sta, WLAN_STA_PS_DRIVER); | |
af818581 JB |
253 | } |
254 | ||
af65cd96 JB |
255 | static int sta_prepare_rate_control(struct ieee80211_local *local, |
256 | struct sta_info *sta, gfp_t gfp) | |
257 | { | |
258 | if (local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL) | |
259 | return 0; | |
260 | ||
261 | sta->rate_ctrl = rate_control_get(local->rate_ctrl); | |
262 | sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl, | |
263 | &sta->sta, gfp); | |
264 | if (!sta->rate_ctrl_priv) { | |
265 | rate_control_put(sta->rate_ctrl); | |
266 | return -ENOMEM; | |
267 | } | |
268 | ||
269 | return 0; | |
270 | } | |
271 | ||
73651ee6 JB |
272 | struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata, |
273 | u8 *addr, gfp_t gfp) | |
f0706e82 | 274 | { |
d0709a65 | 275 | struct ieee80211_local *local = sdata->local; |
f0706e82 | 276 | struct sta_info *sta; |
ebe27c91 | 277 | struct timespec uptime; |
16c5f15c | 278 | int i; |
f0706e82 | 279 | |
17741cdc | 280 | sta = kzalloc(sizeof(*sta) + local->hw.sta_data_size, gfp); |
f0706e82 | 281 | if (!sta) |
73651ee6 | 282 | return NULL; |
f0706e82 | 283 | |
07346f81 | 284 | spin_lock_init(&sta->lock); |
5a9f7b04 | 285 | spin_lock_init(&sta->flaglock); |
af818581 | 286 | INIT_WORK(&sta->drv_unblock_wk, sta_unblock); |
67c282c0 | 287 | INIT_WORK(&sta->ampdu_mlme.work, ieee80211_ba_session_work); |
a93e3644 | 288 | mutex_init(&sta->ampdu_mlme.mtx); |
07346f81 | 289 | |
17741cdc | 290 | memcpy(sta->sta.addr, addr, ETH_ALEN); |
d0709a65 JB |
291 | sta->local = local; |
292 | sta->sdata = sdata; | |
8bc8aecd | 293 | sta->last_rx = jiffies; |
f0706e82 | 294 | |
ebe27c91 MSS |
295 | do_posix_clock_monotonic_gettime(&uptime); |
296 | sta->last_connected = uptime.tv_sec; | |
541a45a1 BR |
297 | ewma_init(&sta->avg_signal, 1024, 8); |
298 | ||
af65cd96 | 299 | if (sta_prepare_rate_control(local, sta, gfp)) { |
f0706e82 | 300 | kfree(sta); |
73651ee6 | 301 | return NULL; |
f0706e82 JB |
302 | } |
303 | ||
16c5f15c | 304 | for (i = 0; i < STA_TID_NUM; i++) { |
a622ab72 JB |
305 | /* |
306 | * timer_to_tid must be initialized with identity mapping | |
307 | * to enable session_timer's data differentiation. See | |
308 | * sta_rx_agg_session_timer_expired for usage. | |
309 | */ | |
16c5f15c | 310 | sta->timer_to_tid[i] = i; |
16c5f15c | 311 | } |
948d887d JB |
312 | for (i = 0; i < IEEE80211_NUM_ACS; i++) { |
313 | skb_queue_head_init(&sta->ps_tx_buf[i]); | |
314 | skb_queue_head_init(&sta->tx_filtered[i]); | |
315 | } | |
73651ee6 | 316 | |
cccaec98 | 317 | for (i = 0; i < NUM_RX_DATA_QUEUES; i++) |
4be929be | 318 | sta->last_seq_ctrl[i] = cpu_to_le16(USHRT_MAX); |
cccaec98 | 319 | |
73651ee6 | 320 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
0fb9a9ec | 321 | wiphy_debug(local->hw.wiphy, "Allocated STA %pM\n", sta->sta.addr); |
73651ee6 JB |
322 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
323 | ||
03e4497e | 324 | #ifdef CONFIG_MAC80211_MESH |
57cf8043 | 325 | sta->plink_state = NL80211_PLINK_LISTEN; |
03e4497e JB |
326 | init_timer(&sta->plink_timer); |
327 | #endif | |
328 | ||
73651ee6 JB |
329 | return sta; |
330 | } | |
331 | ||
2a33bee2 GE |
332 | static int sta_info_finish_insert(struct sta_info *sta, |
333 | bool async, bool dummy_reinsert) | |
73651ee6 JB |
334 | { |
335 | struct ieee80211_local *local = sta->local; | |
336 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
98b62183 | 337 | struct station_info sinfo; |
73651ee6 | 338 | unsigned long flags; |
93e5deb1 | 339 | int err = 0; |
73651ee6 | 340 | |
46a5ebaf | 341 | lockdep_assert_held(&local->sta_mtx); |
34e89507 | 342 | |
2a33bee2 GE |
343 | if (!sta->dummy || dummy_reinsert) { |
344 | /* notify driver */ | |
345 | if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) | |
346 | sdata = container_of(sdata->bss, | |
347 | struct ieee80211_sub_if_data, | |
348 | u.ap); | |
349 | err = drv_sta_add(local, sdata, &sta->sta); | |
350 | if (err) { | |
351 | if (!async) | |
352 | return err; | |
353 | printk(KERN_DEBUG "%s: failed to add IBSS STA %pM to " | |
354 | "driver (%d) - keeping it anyway.\n", | |
355 | sdata->name, sta->sta.addr, err); | |
356 | } else { | |
357 | sta->uploaded = true; | |
34e89507 | 358 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
2a33bee2 GE |
359 | if (async) |
360 | wiphy_debug(local->hw.wiphy, | |
361 | "Finished adding IBSS STA %pM\n", | |
362 | sta->sta.addr); | |
34e89507 | 363 | #endif |
2a33bee2 GE |
364 | } |
365 | ||
366 | sdata = sta->sdata; | |
34e89507 JB |
367 | } |
368 | ||
2a33bee2 GE |
369 | if (!dummy_reinsert) { |
370 | if (!async) { | |
371 | local->num_sta++; | |
372 | local->sta_generation++; | |
373 | smp_mb(); | |
34e89507 | 374 | |
2a33bee2 GE |
375 | /* make the station visible */ |
376 | spin_lock_irqsave(&local->sta_lock, flags); | |
377 | sta_info_hash_add(local, sta); | |
378 | spin_unlock_irqrestore(&local->sta_lock, flags); | |
379 | } | |
34e89507 | 380 | |
2a33bee2 GE |
381 | list_add(&sta->list, &local->sta_list); |
382 | } else { | |
383 | sta->dummy = false; | |
34e89507 JB |
384 | } |
385 | ||
2a33bee2 GE |
386 | if (!sta->dummy) { |
387 | ieee80211_sta_debugfs_add(sta); | |
388 | rate_control_add_sta_debugfs(sta); | |
34e89507 | 389 | |
2a33bee2 GE |
390 | memset(&sinfo, 0, sizeof(sinfo)); |
391 | sinfo.filled = 0; | |
392 | sinfo.generation = local->sta_generation; | |
393 | cfg80211_new_sta(sdata->dev, sta->sta.addr, &sinfo, GFP_KERNEL); | |
394 | } | |
34e89507 JB |
395 | |
396 | return 0; | |
397 | } | |
398 | ||
399 | static void sta_info_finish_pending(struct ieee80211_local *local) | |
400 | { | |
401 | struct sta_info *sta; | |
402 | unsigned long flags; | |
403 | ||
404 | spin_lock_irqsave(&local->sta_lock, flags); | |
405 | while (!list_empty(&local->sta_pending_list)) { | |
406 | sta = list_first_entry(&local->sta_pending_list, | |
407 | struct sta_info, list); | |
408 | list_del(&sta->list); | |
409 | spin_unlock_irqrestore(&local->sta_lock, flags); | |
410 | ||
2a33bee2 | 411 | sta_info_finish_insert(sta, true, false); |
34e89507 JB |
412 | |
413 | spin_lock_irqsave(&local->sta_lock, flags); | |
414 | } | |
415 | spin_unlock_irqrestore(&local->sta_lock, flags); | |
416 | } | |
417 | ||
418 | static void sta_info_finish_work(struct work_struct *work) | |
419 | { | |
420 | struct ieee80211_local *local = | |
421 | container_of(work, struct ieee80211_local, sta_finish_work); | |
422 | ||
423 | mutex_lock(&local->sta_mtx); | |
424 | sta_info_finish_pending(local); | |
425 | mutex_unlock(&local->sta_mtx); | |
426 | } | |
427 | ||
8c71df7a | 428 | static int sta_info_insert_check(struct sta_info *sta) |
34e89507 | 429 | { |
34e89507 | 430 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
34e89507 | 431 | |
03e4497e JB |
432 | /* |
433 | * Can't be a WARN_ON because it can be triggered through a race: | |
434 | * something inserts a STA (on one CPU) without holding the RTNL | |
435 | * and another CPU turns off the net device. | |
436 | */ | |
8c71df7a GE |
437 | if (unlikely(!ieee80211_sdata_running(sdata))) |
438 | return -ENETDOWN; | |
03e4497e | 439 | |
47846c9b | 440 | if (WARN_ON(compare_ether_addr(sta->sta.addr, sdata->vif.addr) == 0 || |
8c71df7a GE |
441 | is_multicast_ether_addr(sta->sta.addr))) |
442 | return -EINVAL; | |
443 | ||
444 | return 0; | |
445 | } | |
446 | ||
447 | static int sta_info_insert_ibss(struct sta_info *sta) __acquires(RCU) | |
448 | { | |
449 | struct ieee80211_local *local = sta->local; | |
450 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
451 | unsigned long flags; | |
452 | ||
453 | spin_lock_irqsave(&local->sta_lock, flags); | |
454 | /* check if STA exists already */ | |
2a33bee2 | 455 | if (sta_info_get_bss_rx(sdata, sta->sta.addr)) { |
8c71df7a | 456 | spin_unlock_irqrestore(&local->sta_lock, flags); |
34e89507 | 457 | rcu_read_lock(); |
8c71df7a | 458 | return -EEXIST; |
93e5deb1 | 459 | } |
44213b5e | 460 | |
8c71df7a GE |
461 | local->num_sta++; |
462 | local->sta_generation++; | |
463 | smp_mb(); | |
464 | sta_info_hash_add(local, sta); | |
34e89507 | 465 | |
8c71df7a | 466 | list_add_tail(&sta->list, &local->sta_pending_list); |
34e89507 | 467 | |
8c71df7a GE |
468 | rcu_read_lock(); |
469 | spin_unlock_irqrestore(&local->sta_lock, flags); | |
34e89507 JB |
470 | |
471 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
8c71df7a GE |
472 | wiphy_debug(local->hw.wiphy, "Added IBSS STA %pM\n", |
473 | sta->sta.addr); | |
34e89507 JB |
474 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
475 | ||
8c71df7a | 476 | ieee80211_queue_work(&local->hw, &local->sta_finish_work); |
34e89507 | 477 | |
8c71df7a GE |
478 | return 0; |
479 | } | |
480 | ||
481 | /* | |
482 | * should be called with sta_mtx locked | |
483 | * this function replaces the mutex lock | |
484 | * with a RCU lock | |
485 | */ | |
486 | static int sta_info_insert_non_ibss(struct sta_info *sta) __acquires(RCU) | |
487 | { | |
488 | struct ieee80211_local *local = sta->local; | |
489 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
490 | unsigned long flags; | |
2a33bee2 GE |
491 | struct sta_info *exist_sta; |
492 | bool dummy_reinsert = false; | |
8c71df7a GE |
493 | int err = 0; |
494 | ||
495 | lockdep_assert_held(&local->sta_mtx); | |
34e89507 JB |
496 | |
497 | /* | |
498 | * On first glance, this will look racy, because the code | |
8c71df7a | 499 | * in this function, which inserts a station with sleeping, |
34e89507 JB |
500 | * unlocks the sta_lock between checking existence in the |
501 | * hash table and inserting into it. | |
502 | * | |
503 | * However, it is not racy against itself because it keeps | |
8c71df7a | 504 | * the mutex locked. |
34e89507 JB |
505 | */ |
506 | ||
d0709a65 | 507 | spin_lock_irqsave(&local->sta_lock, flags); |
2a33bee2 GE |
508 | /* |
509 | * check if STA exists already. | |
510 | * only accept a scenario of a second call to sta_info_insert_non_ibss | |
511 | * with a dummy station entry that was inserted earlier | |
512 | * in that case - assume that the dummy station flag should | |
513 | * be removed. | |
514 | */ | |
515 | exist_sta = sta_info_get_bss_rx(sdata, sta->sta.addr); | |
516 | if (exist_sta) { | |
517 | if (exist_sta == sta && sta->dummy) { | |
518 | dummy_reinsert = true; | |
519 | } else { | |
520 | spin_unlock_irqrestore(&local->sta_lock, flags); | |
521 | mutex_unlock(&local->sta_mtx); | |
522 | rcu_read_lock(); | |
523 | return -EEXIST; | |
524 | } | |
43ba7e95 | 525 | } |
32bfd35d | 526 | |
34e89507 | 527 | spin_unlock_irqrestore(&local->sta_lock, flags); |
32bfd35d | 528 | |
2a33bee2 | 529 | err = sta_info_finish_insert(sta, false, dummy_reinsert); |
34e89507 JB |
530 | if (err) { |
531 | mutex_unlock(&local->sta_mtx); | |
532 | rcu_read_lock(); | |
8c71df7a | 533 | return err; |
32bfd35d | 534 | } |
d0709a65 | 535 | |
f0706e82 | 536 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
2a33bee2 GE |
537 | wiphy_debug(local->hw.wiphy, "Inserted %sSTA %pM\n", |
538 | sta->dummy ? "dummy " : "", sta->sta.addr); | |
f0706e82 JB |
539 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
540 | ||
34e89507 JB |
541 | /* move reference to rcu-protected */ |
542 | rcu_read_lock(); | |
543 | mutex_unlock(&local->sta_mtx); | |
e9f207f0 | 544 | |
73651ee6 JB |
545 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
546 | mesh_accept_plinks_update(sdata); | |
547 | ||
8c71df7a GE |
548 | return 0; |
549 | } | |
550 | ||
551 | int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU) | |
552 | { | |
553 | struct ieee80211_local *local = sta->local; | |
554 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
555 | int err = 0; | |
556 | ||
557 | err = sta_info_insert_check(sta); | |
558 | if (err) { | |
559 | rcu_read_lock(); | |
560 | goto out_free; | |
561 | } | |
562 | ||
563 | /* | |
564 | * In ad-hoc mode, we sometimes need to insert stations | |
565 | * from tasklet context from the RX path. To avoid races, | |
566 | * always do so in that case -- see the comment below. | |
567 | */ | |
568 | if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { | |
569 | err = sta_info_insert_ibss(sta); | |
570 | if (err) | |
571 | goto out_free; | |
572 | ||
573 | return 0; | |
574 | } | |
575 | ||
576 | /* | |
577 | * It might seem that the function called below is in race against | |
578 | * the function call above that atomically inserts the station... That, | |
579 | * however, is not true because the above code can only | |
580 | * be invoked for IBSS interfaces, and the below code will | |
581 | * not be -- and the two do not race against each other as | |
582 | * the hash table also keys off the interface. | |
583 | */ | |
584 | ||
585 | might_sleep(); | |
586 | ||
587 | mutex_lock(&local->sta_mtx); | |
588 | ||
589 | err = sta_info_insert_non_ibss(sta); | |
590 | if (err) | |
591 | goto out_free; | |
592 | ||
73651ee6 | 593 | return 0; |
93e5deb1 JB |
594 | out_free: |
595 | BUG_ON(!err); | |
596 | __sta_info_free(local, sta); | |
597 | return err; | |
f0706e82 JB |
598 | } |
599 | ||
34e89507 JB |
600 | int sta_info_insert(struct sta_info *sta) |
601 | { | |
602 | int err = sta_info_insert_rcu(sta); | |
603 | ||
604 | rcu_read_unlock(); | |
605 | ||
606 | return err; | |
607 | } | |
608 | ||
2a33bee2 GE |
609 | /* Caller must hold sta->local->sta_mtx */ |
610 | int sta_info_reinsert(struct sta_info *sta) | |
611 | { | |
612 | struct ieee80211_local *local = sta->local; | |
613 | int err = 0; | |
614 | ||
615 | err = sta_info_insert_check(sta); | |
616 | if (err) { | |
617 | mutex_unlock(&local->sta_mtx); | |
618 | return err; | |
619 | } | |
620 | ||
621 | might_sleep(); | |
622 | ||
623 | err = sta_info_insert_non_ibss(sta); | |
624 | rcu_read_unlock(); | |
625 | return err; | |
626 | } | |
627 | ||
004c872e JB |
628 | static inline void __bss_tim_set(struct ieee80211_if_ap *bss, u16 aid) |
629 | { | |
630 | /* | |
631 | * This format has been mandated by the IEEE specifications, | |
632 | * so this line may not be changed to use the __set_bit() format. | |
633 | */ | |
634 | bss->tim[aid / 8] |= (1 << (aid % 8)); | |
635 | } | |
636 | ||
637 | static inline void __bss_tim_clear(struct ieee80211_if_ap *bss, u16 aid) | |
638 | { | |
639 | /* | |
640 | * This format has been mandated by the IEEE specifications, | |
641 | * so this line may not be changed to use the __clear_bit() format. | |
642 | */ | |
643 | bss->tim[aid / 8] &= ~(1 << (aid % 8)); | |
644 | } | |
645 | ||
948d887d JB |
646 | static unsigned long ieee80211_tids_for_ac(int ac) |
647 | { | |
648 | /* If we ever support TIDs > 7, this obviously needs to be adjusted */ | |
649 | switch (ac) { | |
650 | case IEEE80211_AC_VO: | |
651 | return BIT(6) | BIT(7); | |
652 | case IEEE80211_AC_VI: | |
653 | return BIT(4) | BIT(5); | |
654 | case IEEE80211_AC_BE: | |
655 | return BIT(0) | BIT(3); | |
656 | case IEEE80211_AC_BK: | |
657 | return BIT(1) | BIT(2); | |
658 | default: | |
659 | WARN_ON(1); | |
660 | return 0; | |
661 | } | |
662 | } | |
663 | ||
c868cb35 | 664 | void sta_info_recalc_tim(struct sta_info *sta) |
004c872e | 665 | { |
c868cb35 JB |
666 | struct ieee80211_local *local = sta->local; |
667 | struct ieee80211_if_ap *bss = sta->sdata->bss; | |
d0709a65 | 668 | unsigned long flags; |
948d887d JB |
669 | bool indicate_tim = false; |
670 | u8 ignore_for_tim = sta->sta.uapsd_queues; | |
671 | int ac; | |
004c872e | 672 | |
c868cb35 JB |
673 | if (WARN_ON_ONCE(!sta->sdata->bss)) |
674 | return; | |
3e122be0 | 675 | |
c868cb35 JB |
676 | /* No need to do anything if the driver does all */ |
677 | if (local->hw.flags & IEEE80211_HW_AP_LINK_PS) | |
678 | return; | |
004c872e | 679 | |
c868cb35 JB |
680 | if (sta->dead) |
681 | goto done; | |
3e122be0 | 682 | |
948d887d JB |
683 | /* |
684 | * If all ACs are delivery-enabled then we should build | |
685 | * the TIM bit for all ACs anyway; if only some are then | |
686 | * we ignore those and build the TIM bit using only the | |
687 | * non-enabled ones. | |
688 | */ | |
689 | if (ignore_for_tim == BIT(IEEE80211_NUM_ACS) - 1) | |
690 | ignore_for_tim = 0; | |
691 | ||
692 | for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { | |
693 | unsigned long tids; | |
694 | ||
695 | if (ignore_for_tim & BIT(ac)) | |
696 | continue; | |
697 | ||
698 | indicate_tim |= !skb_queue_empty(&sta->tx_filtered[ac]) || | |
699 | !skb_queue_empty(&sta->ps_tx_buf[ac]); | |
700 | if (indicate_tim) | |
701 | break; | |
702 | ||
703 | tids = ieee80211_tids_for_ac(ac); | |
704 | ||
705 | indicate_tim |= | |
706 | sta->driver_buffered_tids & tids; | |
707 | } | |
3e122be0 | 708 | |
c868cb35 JB |
709 | done: |
710 | spin_lock_irqsave(&local->sta_lock, flags); | |
004c872e | 711 | |
948d887d | 712 | if (indicate_tim) |
c868cb35 JB |
713 | __bss_tim_set(bss, sta->sta.aid); |
714 | else | |
715 | __bss_tim_clear(bss, sta->sta.aid); | |
004c872e | 716 | |
c868cb35 JB |
717 | if (local->ops->set_tim) { |
718 | local->tim_in_locked_section = true; | |
948d887d | 719 | drv_set_tim(local, &sta->sta, indicate_tim); |
c868cb35 JB |
720 | local->tim_in_locked_section = false; |
721 | } | |
3e122be0 | 722 | |
c868cb35 | 723 | spin_unlock_irqrestore(&local->sta_lock, flags); |
004c872e JB |
724 | } |
725 | ||
cd0b8d89 | 726 | static bool sta_info_buffer_expired(struct sta_info *sta, struct sk_buff *skb) |
f0706e82 | 727 | { |
e039fa4a | 728 | struct ieee80211_tx_info *info; |
f0706e82 JB |
729 | int timeout; |
730 | ||
731 | if (!skb) | |
cd0b8d89 | 732 | return false; |
f0706e82 | 733 | |
e039fa4a | 734 | info = IEEE80211_SKB_CB(skb); |
f0706e82 JB |
735 | |
736 | /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */ | |
57c4d7b4 JB |
737 | timeout = (sta->listen_interval * |
738 | sta->sdata->vif.bss_conf.beacon_int * | |
739 | 32 / 15625) * HZ; | |
f0706e82 JB |
740 | if (timeout < STA_TX_BUFFER_EXPIRE) |
741 | timeout = STA_TX_BUFFER_EXPIRE; | |
e039fa4a | 742 | return time_after(jiffies, info->control.jiffies + timeout); |
f0706e82 JB |
743 | } |
744 | ||
745 | ||
948d887d JB |
746 | static bool sta_info_cleanup_expire_buffered_ac(struct ieee80211_local *local, |
747 | struct sta_info *sta, int ac) | |
f0706e82 JB |
748 | { |
749 | unsigned long flags; | |
750 | struct sk_buff *skb; | |
751 | ||
60750397 JB |
752 | /* |
753 | * First check for frames that should expire on the filtered | |
754 | * queue. Frames here were rejected by the driver and are on | |
755 | * a separate queue to avoid reordering with normal PS-buffered | |
756 | * frames. They also aren't accounted for right now in the | |
757 | * total_ps_buffered counter. | |
758 | */ | |
759 | for (;;) { | |
948d887d JB |
760 | spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags); |
761 | skb = skb_peek(&sta->tx_filtered[ac]); | |
60750397 | 762 | if (sta_info_buffer_expired(sta, skb)) |
948d887d | 763 | skb = __skb_dequeue(&sta->tx_filtered[ac]); |
60750397 JB |
764 | else |
765 | skb = NULL; | |
948d887d | 766 | spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags); |
60750397 JB |
767 | |
768 | /* | |
769 | * Frames are queued in order, so if this one | |
770 | * hasn't expired yet we can stop testing. If | |
771 | * we actually reached the end of the queue we | |
772 | * also need to stop, of course. | |
773 | */ | |
774 | if (!skb) | |
775 | break; | |
776 | dev_kfree_skb(skb); | |
777 | } | |
778 | ||
779 | /* | |
780 | * Now also check the normal PS-buffered queue, this will | |
781 | * only find something if the filtered queue was emptied | |
782 | * since the filtered frames are all before the normal PS | |
783 | * buffered frames. | |
784 | */ | |
f0706e82 | 785 | for (;;) { |
948d887d JB |
786 | spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags); |
787 | skb = skb_peek(&sta->ps_tx_buf[ac]); | |
57c4d7b4 | 788 | if (sta_info_buffer_expired(sta, skb)) |
948d887d | 789 | skb = __skb_dequeue(&sta->ps_tx_buf[ac]); |
836341a7 | 790 | else |
f0706e82 | 791 | skb = NULL; |
948d887d | 792 | spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags); |
f0706e82 | 793 | |
60750397 JB |
794 | /* |
795 | * frames are queued in order, so if this one | |
796 | * hasn't expired yet (or we reached the end of | |
797 | * the queue) we can stop testing | |
798 | */ | |
836341a7 | 799 | if (!skb) |
f0706e82 | 800 | break; |
836341a7 | 801 | |
836341a7 | 802 | local->total_ps_buffered--; |
f4ea83dd | 803 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
0c68ae26 JB |
804 | printk(KERN_DEBUG "Buffered frame expired (STA %pM)\n", |
805 | sta->sta.addr); | |
f4ea83dd | 806 | #endif |
836341a7 | 807 | dev_kfree_skb(skb); |
f0706e82 | 808 | } |
3393a608 | 809 | |
60750397 JB |
810 | /* |
811 | * Finally, recalculate the TIM bit for this station -- it might | |
812 | * now be clear because the station was too slow to retrieve its | |
813 | * frames. | |
814 | */ | |
815 | sta_info_recalc_tim(sta); | |
816 | ||
817 | /* | |
818 | * Return whether there are any frames still buffered, this is | |
819 | * used to check whether the cleanup timer still needs to run, | |
820 | * if there are no frames we don't need to rearm the timer. | |
821 | */ | |
948d887d JB |
822 | return !(skb_queue_empty(&sta->ps_tx_buf[ac]) && |
823 | skb_queue_empty(&sta->tx_filtered[ac])); | |
824 | } | |
825 | ||
826 | static bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local, | |
827 | struct sta_info *sta) | |
828 | { | |
829 | bool have_buffered = false; | |
830 | int ac; | |
831 | ||
832 | /* This is only necessary for stations on BSS interfaces */ | |
833 | if (!sta->sdata->bss) | |
834 | return false; | |
835 | ||
836 | for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) | |
837 | have_buffered |= | |
838 | sta_info_cleanup_expire_buffered_ac(local, sta, ac); | |
839 | ||
840 | return have_buffered; | |
f0706e82 JB |
841 | } |
842 | ||
34e89507 | 843 | static int __must_check __sta_info_destroy(struct sta_info *sta) |
f0706e82 | 844 | { |
34e89507 JB |
845 | struct ieee80211_local *local; |
846 | struct ieee80211_sub_if_data *sdata; | |
34e89507 | 847 | unsigned long flags; |
948d887d | 848 | int ret, i, ac; |
f0706e82 | 849 | |
34e89507 | 850 | might_sleep(); |
f0706e82 | 851 | |
34e89507 JB |
852 | if (!sta) |
853 | return -ENOENT; | |
5bb644a0 | 854 | |
34e89507 JB |
855 | local = sta->local; |
856 | sdata = sta->sdata; | |
f0706e82 | 857 | |
098a6070 JB |
858 | /* |
859 | * Before removing the station from the driver and | |
860 | * rate control, it might still start new aggregation | |
861 | * sessions -- block that to make sure the tear-down | |
862 | * will be sufficient. | |
863 | */ | |
864 | set_sta_flags(sta, WLAN_STA_BLOCK_BA); | |
53f73c09 | 865 | ieee80211_sta_tear_down_BA_sessions(sta, true); |
098a6070 | 866 | |
34e89507 JB |
867 | spin_lock_irqsave(&local->sta_lock, flags); |
868 | ret = sta_info_hash_del(local, sta); | |
869 | /* this might still be the pending list ... which is fine */ | |
870 | if (!ret) | |
871 | list_del(&sta->list); | |
872 | spin_unlock_irqrestore(&local->sta_lock, flags); | |
873 | if (ret) | |
874 | return ret; | |
875 | ||
8cb23153 | 876 | mutex_lock(&local->key_mtx); |
e31b8213 | 877 | for (i = 0; i < NUM_DEFAULT_KEYS; i++) |
40b275b6 | 878 | __ieee80211_key_free(key_mtx_dereference(local, sta->gtk[i])); |
e31b8213 | 879 | if (sta->ptk) |
40b275b6 | 880 | __ieee80211_key_free(key_mtx_dereference(local, sta->ptk)); |
8cb23153 | 881 | mutex_unlock(&local->key_mtx); |
34e89507 JB |
882 | |
883 | sta->dead = true; | |
884 | ||
885 | if (test_and_clear_sta_flags(sta, | |
886 | WLAN_STA_PS_STA | WLAN_STA_PS_DRIVER)) { | |
887 | BUG_ON(!sdata->bss); | |
888 | ||
889 | atomic_dec(&sdata->bss->num_sta_ps); | |
c868cb35 | 890 | sta_info_recalc_tim(sta); |
34e89507 JB |
891 | } |
892 | ||
893 | local->num_sta--; | |
894 | local->sta_generation++; | |
895 | ||
896 | if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) | |
897 | rcu_assign_pointer(sdata->u.vlan.sta, NULL); | |
898 | ||
899 | if (sta->uploaded) { | |
900 | if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) | |
901 | sdata = container_of(sdata->bss, | |
902 | struct ieee80211_sub_if_data, | |
903 | u.ap); | |
904 | drv_sta_remove(local, sdata, &sta->sta); | |
905 | sdata = sta->sdata; | |
906 | } | |
907 | ||
e64b3795 JB |
908 | /* |
909 | * At this point, after we wait for an RCU grace period, | |
910 | * neither mac80211 nor the driver can reference this | |
911 | * sta struct any more except by still existing timers | |
912 | * associated with this station that we clean up below. | |
913 | */ | |
914 | synchronize_rcu(); | |
915 | ||
948d887d JB |
916 | for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { |
917 | local->total_ps_buffered -= skb_queue_len(&sta->ps_tx_buf[ac]); | |
918 | __skb_queue_purge(&sta->ps_tx_buf[ac]); | |
919 | __skb_queue_purge(&sta->tx_filtered[ac]); | |
920 | } | |
c868cb35 | 921 | |
34e89507 | 922 | #ifdef CONFIG_MAC80211_MESH |
e64b3795 | 923 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
34e89507 | 924 | mesh_accept_plinks_update(sdata); |
34e89507 JB |
925 | #endif |
926 | ||
927 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG | |
0fb9a9ec | 928 | wiphy_debug(local->hw.wiphy, "Removed STA %pM\n", sta->sta.addr); |
34e89507 JB |
929 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
930 | cancel_work_sync(&sta->drv_unblock_wk); | |
931 | ||
ec15e68b JM |
932 | cfg80211_del_sta(sdata->dev, sta->sta.addr, GFP_KERNEL); |
933 | ||
34e89507 JB |
934 | rate_control_remove_sta_debugfs(sta); |
935 | ieee80211_sta_debugfs_remove(sta); | |
936 | ||
937 | #ifdef CONFIG_MAC80211_MESH | |
938 | if (ieee80211_vif_is_mesh(&sta->sdata->vif)) { | |
939 | mesh_plink_deactivate(sta); | |
940 | del_timer_sync(&sta->plink_timer); | |
941 | } | |
942 | #endif | |
943 | ||
34e89507 JB |
944 | __sta_info_free(local, sta); |
945 | ||
946 | return 0; | |
4d6141c3 JS |
947 | } |
948 | ||
34e89507 | 949 | int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, const u8 *addr) |
4d6141c3 | 950 | { |
34e89507 JB |
951 | struct sta_info *sta; |
952 | int ret; | |
4d6141c3 | 953 | |
34e89507 | 954 | mutex_lock(&sdata->local->sta_mtx); |
2a33bee2 | 955 | sta = sta_info_get_rx(sdata, addr); |
34e89507 JB |
956 | ret = __sta_info_destroy(sta); |
957 | mutex_unlock(&sdata->local->sta_mtx); | |
4d6141c3 JS |
958 | |
959 | return ret; | |
960 | } | |
961 | ||
34e89507 JB |
962 | int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata, |
963 | const u8 *addr) | |
e9f207f0 | 964 | { |
34e89507 JB |
965 | struct sta_info *sta; |
966 | int ret; | |
e9f207f0 | 967 | |
34e89507 | 968 | mutex_lock(&sdata->local->sta_mtx); |
2a33bee2 | 969 | sta = sta_info_get_bss_rx(sdata, addr); |
34e89507 JB |
970 | ret = __sta_info_destroy(sta); |
971 | mutex_unlock(&sdata->local->sta_mtx); | |
d0709a65 | 972 | |
34e89507 JB |
973 | return ret; |
974 | } | |
e9f207f0 | 975 | |
34e89507 JB |
976 | static void sta_info_cleanup(unsigned long data) |
977 | { | |
978 | struct ieee80211_local *local = (struct ieee80211_local *) data; | |
979 | struct sta_info *sta; | |
3393a608 | 980 | bool timer_needed = false; |
34e89507 JB |
981 | |
982 | rcu_read_lock(); | |
983 | list_for_each_entry_rcu(sta, &local->sta_list, list) | |
3393a608 JO |
984 | if (sta_info_cleanup_expire_buffered(local, sta)) |
985 | timer_needed = true; | |
34e89507 | 986 | rcu_read_unlock(); |
e9f207f0 | 987 | |
34e89507 JB |
988 | if (local->quiescing) |
989 | return; | |
d0709a65 | 990 | |
3393a608 JO |
991 | if (!timer_needed) |
992 | return; | |
993 | ||
26d59535 JB |
994 | mod_timer(&local->sta_cleanup, |
995 | round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL)); | |
e9f207f0 | 996 | } |
e9f207f0 | 997 | |
f0706e82 JB |
998 | void sta_info_init(struct ieee80211_local *local) |
999 | { | |
d0709a65 | 1000 | spin_lock_init(&local->sta_lock); |
34e89507 | 1001 | mutex_init(&local->sta_mtx); |
f0706e82 | 1002 | INIT_LIST_HEAD(&local->sta_list); |
34e89507 JB |
1003 | INIT_LIST_HEAD(&local->sta_pending_list); |
1004 | INIT_WORK(&local->sta_finish_work, sta_info_finish_work); | |
f0706e82 | 1005 | |
b24b8a24 PE |
1006 | setup_timer(&local->sta_cleanup, sta_info_cleanup, |
1007 | (unsigned long)local); | |
f0706e82 JB |
1008 | } |
1009 | ||
1010 | void sta_info_stop(struct ieee80211_local *local) | |
1011 | { | |
f0706e82 | 1012 | del_timer(&local->sta_cleanup); |
be8755e1 | 1013 | sta_info_flush(local, NULL); |
f0706e82 JB |
1014 | } |
1015 | ||
f0706e82 JB |
1016 | /** |
1017 | * sta_info_flush - flush matching STA entries from the STA table | |
44213b5e JB |
1018 | * |
1019 | * Returns the number of removed STA entries. | |
1020 | * | |
f0706e82 | 1021 | * @local: local interface data |
d0709a65 | 1022 | * @sdata: matching rule for the net device (sta->dev) or %NULL to match all STAs |
f0706e82 | 1023 | */ |
44213b5e | 1024 | int sta_info_flush(struct ieee80211_local *local, |
af8cdcd8 | 1025 | struct ieee80211_sub_if_data *sdata) |
f0706e82 JB |
1026 | { |
1027 | struct sta_info *sta, *tmp; | |
44213b5e | 1028 | int ret = 0; |
f0706e82 | 1029 | |
d0709a65 | 1030 | might_sleep(); |
be8755e1 | 1031 | |
34e89507 JB |
1032 | mutex_lock(&local->sta_mtx); |
1033 | ||
1034 | sta_info_finish_pending(local); | |
1035 | ||
d0709a65 | 1036 | list_for_each_entry_safe(sta, tmp, &local->sta_list, list) { |
34e89507 JB |
1037 | if (!sdata || sdata == sta->sdata) |
1038 | WARN_ON(__sta_info_destroy(sta)); | |
be8755e1 | 1039 | } |
34e89507 | 1040 | mutex_unlock(&local->sta_mtx); |
44213b5e JB |
1041 | |
1042 | return ret; | |
f0706e82 | 1043 | } |
dc6676b7 | 1044 | |
24723d1b JB |
1045 | void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata, |
1046 | unsigned long exp_time) | |
1047 | { | |
1048 | struct ieee80211_local *local = sdata->local; | |
1049 | struct sta_info *sta, *tmp; | |
24723d1b | 1050 | |
34e89507 | 1051 | mutex_lock(&local->sta_mtx); |
24723d1b JB |
1052 | list_for_each_entry_safe(sta, tmp, &local->sta_list, list) |
1053 | if (time_after(jiffies, sta->last_rx + exp_time)) { | |
1054 | #ifdef CONFIG_MAC80211_IBSS_DEBUG | |
0c68ae26 | 1055 | printk(KERN_DEBUG "%s: expiring inactive STA %pM\n", |
47846c9b | 1056 | sdata->name, sta->sta.addr); |
24723d1b | 1057 | #endif |
34e89507 | 1058 | WARN_ON(__sta_info_destroy(sta)); |
24723d1b | 1059 | } |
34e89507 | 1060 | mutex_unlock(&local->sta_mtx); |
24723d1b | 1061 | } |
17741cdc | 1062 | |
686b9cb9 BG |
1063 | struct ieee80211_sta *ieee80211_find_sta_by_ifaddr(struct ieee80211_hw *hw, |
1064 | const u8 *addr, | |
1065 | const u8 *localaddr) | |
17741cdc | 1066 | { |
abe60632 | 1067 | struct sta_info *sta, *nxt; |
17741cdc | 1068 | |
686b9cb9 BG |
1069 | /* |
1070 | * Just return a random station if localaddr is NULL | |
1071 | * ... first in list. | |
1072 | */ | |
f7c65594 | 1073 | for_each_sta_info(hw_to_local(hw), addr, sta, nxt) { |
686b9cb9 BG |
1074 | if (localaddr && |
1075 | compare_ether_addr(sta->sdata->vif.addr, localaddr) != 0) | |
1076 | continue; | |
f7c65594 JB |
1077 | if (!sta->uploaded) |
1078 | return NULL; | |
abe60632 | 1079 | return &sta->sta; |
f7c65594 JB |
1080 | } |
1081 | ||
abe60632 | 1082 | return NULL; |
17741cdc | 1083 | } |
686b9cb9 | 1084 | EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr); |
5ed176e1 JB |
1085 | |
1086 | struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif, | |
1087 | const u8 *addr) | |
1088 | { | |
f7c65594 | 1089 | struct sta_info *sta; |
5ed176e1 JB |
1090 | |
1091 | if (!vif) | |
1092 | return NULL; | |
1093 | ||
f7c65594 JB |
1094 | sta = sta_info_get_bss(vif_to_sdata(vif), addr); |
1095 | if (!sta) | |
1096 | return NULL; | |
1097 | ||
1098 | if (!sta->uploaded) | |
1099 | return NULL; | |
5ed176e1 | 1100 | |
f7c65594 | 1101 | return &sta->sta; |
5ed176e1 | 1102 | } |
17741cdc | 1103 | EXPORT_SYMBOL(ieee80211_find_sta); |
af818581 | 1104 | |
50a9432d JB |
1105 | static void clear_sta_ps_flags(void *_sta) |
1106 | { | |
1107 | struct sta_info *sta = _sta; | |
1108 | ||
1109 | clear_sta_flags(sta, WLAN_STA_PS_DRIVER | WLAN_STA_PS_STA); | |
1110 | } | |
1111 | ||
af818581 JB |
1112 | /* powersave support code */ |
1113 | void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta) | |
1114 | { | |
1115 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
1116 | struct ieee80211_local *local = sdata->local; | |
948d887d JB |
1117 | struct sk_buff_head pending; |
1118 | int filtered = 0, buffered = 0, ac; | |
1119 | ||
1120 | BUILD_BUG_ON(BITS_TO_LONGS(STA_TID_NUM) > 1); | |
1121 | sta->driver_buffered_tids = 0; | |
af818581 | 1122 | |
d057e5a3 AN |
1123 | if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS)) |
1124 | drv_sta_notify(local, sdata, STA_NOTIFY_AWAKE, &sta->sta); | |
af818581 | 1125 | |
948d887d JB |
1126 | skb_queue_head_init(&pending); |
1127 | ||
af818581 | 1128 | /* Send all buffered frames to the station */ |
948d887d JB |
1129 | for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { |
1130 | int count = skb_queue_len(&pending), tmp; | |
1131 | ||
1132 | skb_queue_splice_tail_init(&sta->tx_filtered[ac], &pending); | |
1133 | tmp = skb_queue_len(&pending); | |
1134 | filtered += tmp - count; | |
1135 | count = tmp; | |
1136 | ||
1137 | skb_queue_splice_tail_init(&sta->ps_tx_buf[ac], &pending); | |
1138 | tmp = skb_queue_len(&pending); | |
1139 | buffered += tmp - count; | |
1140 | } | |
1141 | ||
1142 | ieee80211_add_pending_skbs_fn(local, &pending, clear_sta_ps_flags, sta); | |
1143 | ||
af818581 JB |
1144 | local->total_ps_buffered -= buffered; |
1145 | ||
c868cb35 JB |
1146 | sta_info_recalc_tim(sta); |
1147 | ||
af818581 JB |
1148 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
1149 | printk(KERN_DEBUG "%s: STA %pM aid %d sending %d filtered/%d PS frames " | |
47846c9b | 1150 | "since STA not sleeping anymore\n", sdata->name, |
948d887d | 1151 | sta->sta.addr, sta->sta.aid, filtered, buffered); |
af818581 JB |
1152 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
1153 | } | |
1154 | ||
1155 | void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta) | |
1156 | { | |
1157 | struct ieee80211_sub_if_data *sdata = sta->sdata; | |
1158 | struct ieee80211_local *local = sdata->local; | |
948d887d | 1159 | struct sk_buff *skb = NULL; |
4049e09a | 1160 | bool found = false; |
948d887d JB |
1161 | bool more_data = false; |
1162 | int ac; | |
4049e09a | 1163 | unsigned long driver_release_tids = 0; |
948d887d | 1164 | u8 ignore_for_response = sta->sta.uapsd_queues; |
af818581 | 1165 | |
948d887d JB |
1166 | /* |
1167 | * If all ACs are delivery-enabled then we should reply | |
1168 | * from any of them, if only some are enabled we reply | |
1169 | * only from the non-enabled ones. | |
1170 | */ | |
1171 | if (ignore_for_response == BIT(IEEE80211_NUM_ACS) - 1) | |
1172 | ignore_for_response = 0; | |
1173 | ||
1174 | /* | |
1175 | * Get response frame and more data bit for it. | |
1176 | */ | |
1177 | for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { | |
4049e09a JB |
1178 | unsigned long tids; |
1179 | ||
948d887d JB |
1180 | if (ignore_for_response & BIT(ac)) |
1181 | continue; | |
1182 | ||
4049e09a JB |
1183 | tids = ieee80211_tids_for_ac(ac); |
1184 | ||
1185 | if (!found) { | |
1186 | driver_release_tids = sta->driver_buffered_tids & tids; | |
1187 | if (driver_release_tids) { | |
1188 | found = true; | |
1189 | } else { | |
1190 | skb = skb_dequeue(&sta->tx_filtered[ac]); | |
1191 | if (!skb) { | |
1192 | skb = skb_dequeue(&sta->ps_tx_buf[ac]); | |
1193 | if (skb) | |
1194 | local->total_ps_buffered--; | |
1195 | } | |
948d887d | 1196 | if (skb) |
4049e09a | 1197 | found = true; |
948d887d | 1198 | } |
948d887d | 1199 | |
4049e09a JB |
1200 | /* |
1201 | * If the driver has data on more than one TID then | |
1202 | * certainly there's more data if we release just a | |
1203 | * single frame now (from a single TID). | |
1204 | */ | |
1205 | if (hweight16(driver_release_tids) > 1) { | |
1206 | more_data = true; | |
1207 | driver_release_tids = | |
1208 | BIT(ffs(driver_release_tids) - 1); | |
1209 | break; | |
1210 | } | |
1211 | } | |
948d887d JB |
1212 | |
1213 | if (!skb_queue_empty(&sta->tx_filtered[ac]) || | |
1214 | !skb_queue_empty(&sta->ps_tx_buf[ac])) { | |
1215 | more_data = true; | |
1216 | break; | |
1217 | } | |
af818581 | 1218 | } |
af818581 | 1219 | |
4049e09a JB |
1220 | if (!found) { |
1221 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
1222 | /* | |
1223 | * FIXME: This can be the result of a race condition between | |
1224 | * us expiring a frame and the station polling for it. | |
1225 | * Should we send it a null-func frame indicating we | |
1226 | * have nothing buffered for it? | |
1227 | */ | |
1228 | printk(KERN_DEBUG "%s: STA %pM sent PS Poll even " | |
1229 | "though there are no buffered frames for it\n", | |
1230 | sdata->name, sta->sta.addr); | |
1231 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ | |
1232 | ||
1233 | return; | |
1234 | } | |
1235 | ||
af818581 JB |
1236 | if (skb) { |
1237 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); | |
1238 | struct ieee80211_hdr *hdr = | |
1239 | (struct ieee80211_hdr *) skb->data; | |
1240 | ||
1241 | /* | |
1242 | * Tell TX path to send this frame even though the STA may | |
1243 | * still remain is PS mode after this frame exchange. | |
1244 | */ | |
1245 | info->flags |= IEEE80211_TX_CTL_PSPOLL_RESPONSE; | |
1246 | ||
1247 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG | |
948d887d JB |
1248 | printk(KERN_DEBUG "STA %pM aid %d: PS Poll\n", |
1249 | sta->sta.addr, sta->sta.aid); | |
af818581 JB |
1250 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
1251 | ||
1252 | /* Use MoreData flag to indicate whether there are more | |
1253 | * buffered frames for this STA */ | |
948d887d | 1254 | if (!more_data) |
af818581 JB |
1255 | hdr->frame_control &= cpu_to_le16(~IEEE80211_FCTL_MOREDATA); |
1256 | else | |
1257 | hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_MOREDATA); | |
1258 | ||
1259 | ieee80211_add_pending_skb(local, skb); | |
1260 | ||
c868cb35 | 1261 | sta_info_recalc_tim(sta); |
af818581 JB |
1262 | } else { |
1263 | /* | |
4049e09a JB |
1264 | * We need to release a frame that is buffered somewhere in the |
1265 | * driver ... it'll have to handle that. | |
1266 | * Note that, as per the comment above, it'll also have to see | |
1267 | * if there is more than just one frame on the specific TID that | |
1268 | * we're releasing from, and it needs to set the more-data bit | |
1269 | * accordingly if we tell it that there's no more data. If we do | |
1270 | * tell it there's more data, then of course the more-data bit | |
1271 | * needs to be set anyway. | |
1272 | */ | |
1273 | drv_release_buffered_frames(local, sta, driver_release_tids, | |
1274 | 1, IEEE80211_FRAME_RELEASE_PSPOLL, | |
1275 | more_data); | |
1276 | ||
1277 | /* | |
1278 | * Note that we don't recalculate the TIM bit here as it would | |
1279 | * most likely have no effect at all unless the driver told us | |
1280 | * that the TID became empty before returning here from the | |
1281 | * release function. | |
1282 | * Either way, however, when the driver tells us that the TID | |
1283 | * became empty we'll do the TIM recalculation. | |
af818581 | 1284 | */ |
af818581 JB |
1285 | } |
1286 | } | |
1287 | ||
1288 | void ieee80211_sta_block_awake(struct ieee80211_hw *hw, | |
1289 | struct ieee80211_sta *pubsta, bool block) | |
1290 | { | |
1291 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); | |
1292 | ||
b5878a2d JB |
1293 | trace_api_sta_block_awake(sta->local, pubsta, block); |
1294 | ||
af818581 JB |
1295 | if (block) |
1296 | set_sta_flags(sta, WLAN_STA_PS_DRIVER); | |
50a9432d | 1297 | else if (test_sta_flags(sta, WLAN_STA_PS_DRIVER)) |
af818581 JB |
1298 | ieee80211_queue_work(hw, &sta->drv_unblock_wk); |
1299 | } | |
1300 | EXPORT_SYMBOL(ieee80211_sta_block_awake); | |
dcf55fb5 | 1301 | |
042ec453 JB |
1302 | void ieee80211_sta_set_buffered(struct ieee80211_sta *pubsta, |
1303 | u8 tid, bool buffered) | |
dcf55fb5 FF |
1304 | { |
1305 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); | |
1306 | ||
948d887d | 1307 | if (WARN_ON(tid >= STA_TID_NUM)) |
042ec453 JB |
1308 | return; |
1309 | ||
948d887d JB |
1310 | if (buffered) |
1311 | set_bit(tid, &sta->driver_buffered_tids); | |
1312 | else | |
1313 | clear_bit(tid, &sta->driver_buffered_tids); | |
1314 | ||
c868cb35 | 1315 | sta_info_recalc_tim(sta); |
dcf55fb5 | 1316 | } |
042ec453 | 1317 | EXPORT_SYMBOL(ieee80211_sta_set_buffered); |