Root/
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/etherdevice.h> |
13 | #include <linux/netdevice.h> |
14 | #include <linux/types.h> |
15 | #include <linux/slab.h> |
16 | #include <linux/skbuff.h> |
17 | #include <linux/if_arp.h> |
18 | #include <linux/timer.h> |
19 | #include <linux/rtnetlink.h> |
20 | |
21 | #include <net/mac80211.h> |
22 | #include "ieee80211_i.h" |
23 | #include "driver-ops.h" |
24 | #include "rate.h" |
25 | #include "sta_info.h" |
26 | #include "debugfs_sta.h" |
27 | #include "mesh.h" |
28 | #include "wme.h" |
29 | |
30 | /** |
31 | * DOC: STA information lifetime rules |
32 | * |
33 | * STA info structures (&struct sta_info) are managed in a hash table |
34 | * for faster lookup and a list for iteration. They are managed using |
35 | * RCU, i.e. access to the list and hash table is protected by RCU. |
36 | * |
37 | * Upon allocating a STA info structure with sta_info_alloc(), the caller |
38 | * owns that structure. It must then insert it into the hash table using |
39 | * either sta_info_insert() or sta_info_insert_rcu(); only in the latter |
40 | * case (which acquires an rcu read section but must not be called from |
41 | * within one) will the pointer still be valid after the call. Note that |
42 | * the caller may not do much with the STA info before inserting it, in |
43 | * particular, it may not start any mesh peer link management or add |
44 | * encryption keys. |
45 | * |
46 | * When the insertion fails (sta_info_insert()) returns non-zero), the |
47 | * structure will have been freed by sta_info_insert()! |
48 | * |
49 | * Station entries are added by mac80211 when you establish a link with a |
50 | * peer. This means different things for the different type of interfaces |
51 | * we support. For a regular station this mean we add the AP sta when we |
52 | * receive an association response from the AP. For IBSS this occurs when |
53 | * get to know about a peer on the same IBSS. For WDS we add the sta for |
54 | * the peer immediately upon device open. When using AP mode we add stations |
55 | * for each respective station upon request from userspace through nl80211. |
56 | * |
57 | * In order to remove a STA info structure, various sta_info_destroy_*() |
58 | * calls are available. |
59 | * |
60 | * There is no concept of ownership on a STA entry, each structure is |
61 | * owned by the global hash table/list until it is removed. All users of |
62 | * the structure need to be RCU protected so that the structure won't be |
63 | * freed before they are done using it. |
64 | */ |
65 | |
66 | /* Caller must hold local->sta_mtx */ |
67 | static int sta_info_hash_del(struct ieee80211_local *local, |
68 | struct sta_info *sta) |
69 | { |
70 | struct sta_info *s; |
71 | |
72 | s = rcu_dereference_protected(local->sta_hash[STA_HASH(sta->sta.addr)], |
73 | lockdep_is_held(&local->sta_mtx)); |
74 | if (!s) |
75 | return -ENOENT; |
76 | if (s == sta) { |
77 | rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)], |
78 | s->hnext); |
79 | return 0; |
80 | } |
81 | |
82 | while (rcu_access_pointer(s->hnext) && |
83 | rcu_access_pointer(s->hnext) != sta) |
84 | s = rcu_dereference_protected(s->hnext, |
85 | lockdep_is_held(&local->sta_mtx)); |
86 | if (rcu_access_pointer(s->hnext)) { |
87 | rcu_assign_pointer(s->hnext, sta->hnext); |
88 | return 0; |
89 | } |
90 | |
91 | return -ENOENT; |
92 | } |
93 | |
94 | /* protected by RCU */ |
95 | struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata, |
96 | const u8 *addr) |
97 | { |
98 | struct ieee80211_local *local = sdata->local; |
99 | struct sta_info *sta; |
100 | |
101 | sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)], |
102 | lockdep_is_held(&local->sta_mtx)); |
103 | while (sta) { |
104 | if (sta->sdata == sdata && |
105 | compare_ether_addr(sta->sta.addr, addr) == 0) |
106 | break; |
107 | sta = rcu_dereference_check(sta->hnext, |
108 | lockdep_is_held(&local->sta_mtx)); |
109 | } |
110 | return sta; |
111 | } |
112 | |
113 | /* |
114 | * Get sta info either from the specified interface |
115 | * or from one of its vlans |
116 | */ |
117 | struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata, |
118 | const u8 *addr) |
119 | { |
120 | struct ieee80211_local *local = sdata->local; |
121 | struct sta_info *sta; |
122 | |
123 | sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)], |
124 | lockdep_is_held(&local->sta_mtx)); |
125 | while (sta) { |
126 | if ((sta->sdata == sdata || |
127 | (sta->sdata->bss && sta->sdata->bss == sdata->bss)) && |
128 | compare_ether_addr(sta->sta.addr, addr) == 0) |
129 | break; |
130 | sta = rcu_dereference_check(sta->hnext, |
131 | lockdep_is_held(&local->sta_mtx)); |
132 | } |
133 | return sta; |
134 | } |
135 | |
136 | struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata, |
137 | int idx) |
138 | { |
139 | struct ieee80211_local *local = sdata->local; |
140 | struct sta_info *sta; |
141 | int i = 0; |
142 | |
143 | list_for_each_entry_rcu(sta, &local->sta_list, list) { |
144 | if (sdata != sta->sdata) |
145 | continue; |
146 | if (i < idx) { |
147 | ++i; |
148 | continue; |
149 | } |
150 | return sta; |
151 | } |
152 | |
153 | return NULL; |
154 | } |
155 | |
156 | /** |
157 | * sta_info_free - free STA |
158 | * |
159 | * @local: pointer to the global information |
160 | * @sta: STA info to free |
161 | * |
162 | * This function must undo everything done by sta_info_alloc() |
163 | * that may happen before sta_info_insert(). It may only be |
164 | * called when sta_info_insert() has not been attempted (and |
165 | * if that fails, the station is freed anyway.) |
166 | */ |
167 | void sta_info_free(struct ieee80211_local *local, struct sta_info *sta) |
168 | { |
169 | if (sta->rate_ctrl) |
170 | rate_control_free_sta(sta); |
171 | |
172 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
173 | wiphy_debug(local->hw.wiphy, "Destroyed STA %pM\n", sta->sta.addr); |
174 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
175 | |
176 | kfree(sta); |
177 | } |
178 | |
179 | /* Caller must hold local->sta_mtx */ |
180 | static void sta_info_hash_add(struct ieee80211_local *local, |
181 | struct sta_info *sta) |
182 | { |
183 | lockdep_assert_held(&local->sta_mtx); |
184 | sta->hnext = local->sta_hash[STA_HASH(sta->sta.addr)]; |
185 | rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)], sta); |
186 | } |
187 | |
188 | static void sta_unblock(struct work_struct *wk) |
189 | { |
190 | struct sta_info *sta; |
191 | |
192 | sta = container_of(wk, struct sta_info, drv_unblock_wk); |
193 | |
194 | if (sta->dead) |
195 | return; |
196 | |
197 | if (!test_sta_flag(sta, WLAN_STA_PS_STA)) { |
198 | local_bh_disable(); |
199 | ieee80211_sta_ps_deliver_wakeup(sta); |
200 | local_bh_enable(); |
201 | } else if (test_and_clear_sta_flag(sta, WLAN_STA_PSPOLL)) { |
202 | clear_sta_flag(sta, WLAN_STA_PS_DRIVER); |
203 | |
204 | local_bh_disable(); |
205 | ieee80211_sta_ps_deliver_poll_response(sta); |
206 | local_bh_enable(); |
207 | } else if (test_and_clear_sta_flag(sta, WLAN_STA_UAPSD)) { |
208 | clear_sta_flag(sta, WLAN_STA_PS_DRIVER); |
209 | |
210 | local_bh_disable(); |
211 | ieee80211_sta_ps_deliver_uapsd(sta); |
212 | local_bh_enable(); |
213 | } else |
214 | clear_sta_flag(sta, WLAN_STA_PS_DRIVER); |
215 | } |
216 | |
217 | static int sta_prepare_rate_control(struct ieee80211_local *local, |
218 | struct sta_info *sta, gfp_t gfp) |
219 | { |
220 | if (local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL) |
221 | return 0; |
222 | |
223 | sta->rate_ctrl = local->rate_ctrl; |
224 | sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl, |
225 | &sta->sta, gfp); |
226 | if (!sta->rate_ctrl_priv) |
227 | return -ENOMEM; |
228 | |
229 | return 0; |
230 | } |
231 | |
232 | struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata, |
233 | const u8 *addr, gfp_t gfp) |
234 | { |
235 | struct ieee80211_local *local = sdata->local; |
236 | struct sta_info *sta; |
237 | struct timespec uptime; |
238 | int i; |
239 | |
240 | sta = kzalloc(sizeof(*sta) + local->hw.sta_data_size, gfp); |
241 | if (!sta) |
242 | return NULL; |
243 | |
244 | spin_lock_init(&sta->lock); |
245 | INIT_WORK(&sta->drv_unblock_wk, sta_unblock); |
246 | INIT_WORK(&sta->ampdu_mlme.work, ieee80211_ba_session_work); |
247 | mutex_init(&sta->ampdu_mlme.mtx); |
248 | |
249 | memcpy(sta->sta.addr, addr, ETH_ALEN); |
250 | sta->local = local; |
251 | sta->sdata = sdata; |
252 | sta->last_rx = jiffies; |
253 | |
254 | sta->sta_state = IEEE80211_STA_NONE; |
255 | |
256 | do_posix_clock_monotonic_gettime(&uptime); |
257 | sta->last_connected = uptime.tv_sec; |
258 | ewma_init(&sta->avg_signal, 1024, 8); |
259 | |
260 | if (sta_prepare_rate_control(local, sta, gfp)) { |
261 | kfree(sta); |
262 | return NULL; |
263 | } |
264 | |
265 | for (i = 0; i < STA_TID_NUM; i++) { |
266 | /* |
267 | * timer_to_tid must be initialized with identity mapping |
268 | * to enable session_timer's data differentiation. See |
269 | * sta_rx_agg_session_timer_expired for usage. |
270 | */ |
271 | sta->timer_to_tid[i] = i; |
272 | } |
273 | for (i = 0; i < IEEE80211_NUM_ACS; i++) { |
274 | skb_queue_head_init(&sta->ps_tx_buf[i]); |
275 | skb_queue_head_init(&sta->tx_filtered[i]); |
276 | } |
277 | |
278 | for (i = 0; i < NUM_RX_DATA_QUEUES; i++) |
279 | sta->last_seq_ctrl[i] = cpu_to_le16(USHRT_MAX); |
280 | |
281 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
282 | wiphy_debug(local->hw.wiphy, "Allocated STA %pM\n", sta->sta.addr); |
283 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
284 | |
285 | #ifdef CONFIG_MAC80211_MESH |
286 | sta->plink_state = NL80211_PLINK_LISTEN; |
287 | init_timer(&sta->plink_timer); |
288 | #endif |
289 | |
290 | return sta; |
291 | } |
292 | |
293 | static int sta_info_insert_check(struct sta_info *sta) |
294 | { |
295 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
296 | |
297 | /* |
298 | * Can't be a WARN_ON because it can be triggered through a race: |
299 | * something inserts a STA (on one CPU) without holding the RTNL |
300 | * and another CPU turns off the net device. |
301 | */ |
302 | if (unlikely(!ieee80211_sdata_running(sdata))) |
303 | return -ENETDOWN; |
304 | |
305 | if (WARN_ON(compare_ether_addr(sta->sta.addr, sdata->vif.addr) == 0 || |
306 | is_multicast_ether_addr(sta->sta.addr))) |
307 | return -EINVAL; |
308 | |
309 | return 0; |
310 | } |
311 | |
312 | static int sta_info_insert_drv_state(struct ieee80211_local *local, |
313 | struct ieee80211_sub_if_data *sdata, |
314 | struct sta_info *sta) |
315 | { |
316 | enum ieee80211_sta_state state; |
317 | int err = 0; |
318 | |
319 | for (state = IEEE80211_STA_NOTEXIST; state < sta->sta_state; state++) { |
320 | err = drv_sta_state(local, sdata, sta, state, state + 1); |
321 | if (err) |
322 | break; |
323 | } |
324 | |
325 | if (!err) { |
326 | /* |
327 | * Drivers using legacy sta_add/sta_remove callbacks only |
328 | * get uploaded set to true after sta_add is called. |
329 | */ |
330 | if (!local->ops->sta_add) |
331 | sta->uploaded = true; |
332 | return 0; |
333 | } |
334 | |
335 | if (sdata->vif.type == NL80211_IFTYPE_ADHOC) { |
336 | printk(KERN_DEBUG |
337 | "%s: failed to move IBSS STA %pM to state %d (%d) - keeping it anyway.\n", |
338 | sdata->name, sta->sta.addr, state + 1, err); |
339 | err = 0; |
340 | } |
341 | |
342 | /* unwind on error */ |
343 | for (; state > IEEE80211_STA_NOTEXIST; state--) |
344 | WARN_ON(drv_sta_state(local, sdata, sta, state, state - 1)); |
345 | |
346 | return err; |
347 | } |
348 | |
349 | /* |
350 | * should be called with sta_mtx locked |
351 | * this function replaces the mutex lock |
352 | * with a RCU lock |
353 | */ |
354 | static int sta_info_insert_finish(struct sta_info *sta) __acquires(RCU) |
355 | { |
356 | struct ieee80211_local *local = sta->local; |
357 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
358 | struct station_info sinfo; |
359 | int err = 0; |
360 | |
361 | lockdep_assert_held(&local->sta_mtx); |
362 | |
363 | /* check if STA exists already */ |
364 | if (sta_info_get_bss(sdata, sta->sta.addr)) { |
365 | err = -EEXIST; |
366 | goto out_err; |
367 | } |
368 | |
369 | /* notify driver */ |
370 | err = sta_info_insert_drv_state(local, sdata, sta); |
371 | if (err) |
372 | goto out_err; |
373 | |
374 | local->num_sta++; |
375 | local->sta_generation++; |
376 | smp_mb(); |
377 | |
378 | /* make the station visible */ |
379 | sta_info_hash_add(local, sta); |
380 | |
381 | list_add(&sta->list, &local->sta_list); |
382 | |
383 | set_sta_flag(sta, WLAN_STA_INSERTED); |
384 | |
385 | ieee80211_sta_debugfs_add(sta); |
386 | rate_control_add_sta_debugfs(sta); |
387 | |
388 | memset(&sinfo, 0, sizeof(sinfo)); |
389 | sinfo.filled = 0; |
390 | sinfo.generation = local->sta_generation; |
391 | cfg80211_new_sta(sdata->dev, sta->sta.addr, &sinfo, GFP_KERNEL); |
392 | |
393 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
394 | wiphy_debug(local->hw.wiphy, "Inserted STA %pM\n", sta->sta.addr); |
395 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
396 | |
397 | /* move reference to rcu-protected */ |
398 | rcu_read_lock(); |
399 | mutex_unlock(&local->sta_mtx); |
400 | |
401 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
402 | mesh_accept_plinks_update(sdata); |
403 | |
404 | return 0; |
405 | out_err: |
406 | mutex_unlock(&local->sta_mtx); |
407 | rcu_read_lock(); |
408 | return err; |
409 | } |
410 | |
411 | int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU) |
412 | { |
413 | struct ieee80211_local *local = sta->local; |
414 | int err = 0; |
415 | |
416 | might_sleep(); |
417 | |
418 | err = sta_info_insert_check(sta); |
419 | if (err) { |
420 | rcu_read_lock(); |
421 | goto out_free; |
422 | } |
423 | |
424 | mutex_lock(&local->sta_mtx); |
425 | |
426 | err = sta_info_insert_finish(sta); |
427 | if (err) |
428 | goto out_free; |
429 | |
430 | return 0; |
431 | out_free: |
432 | BUG_ON(!err); |
433 | sta_info_free(local, sta); |
434 | return err; |
435 | } |
436 | |
437 | int sta_info_insert(struct sta_info *sta) |
438 | { |
439 | int err = sta_info_insert_rcu(sta); |
440 | |
441 | rcu_read_unlock(); |
442 | |
443 | return err; |
444 | } |
445 | |
446 | static inline void __bss_tim_set(struct ieee80211_if_ap *bss, u16 aid) |
447 | { |
448 | /* |
449 | * This format has been mandated by the IEEE specifications, |
450 | * so this line may not be changed to use the __set_bit() format. |
451 | */ |
452 | bss->tim[aid / 8] |= (1 << (aid % 8)); |
453 | } |
454 | |
455 | static inline void __bss_tim_clear(struct ieee80211_if_ap *bss, u16 aid) |
456 | { |
457 | /* |
458 | * This format has been mandated by the IEEE specifications, |
459 | * so this line may not be changed to use the __clear_bit() format. |
460 | */ |
461 | bss->tim[aid / 8] &= ~(1 << (aid % 8)); |
462 | } |
463 | |
464 | static unsigned long ieee80211_tids_for_ac(int ac) |
465 | { |
466 | /* If we ever support TIDs > 7, this obviously needs to be adjusted */ |
467 | switch (ac) { |
468 | case IEEE80211_AC_VO: |
469 | return BIT(6) | BIT(7); |
470 | case IEEE80211_AC_VI: |
471 | return BIT(4) | BIT(5); |
472 | case IEEE80211_AC_BE: |
473 | return BIT(0) | BIT(3); |
474 | case IEEE80211_AC_BK: |
475 | return BIT(1) | BIT(2); |
476 | default: |
477 | WARN_ON(1); |
478 | return 0; |
479 | } |
480 | } |
481 | |
482 | void sta_info_recalc_tim(struct sta_info *sta) |
483 | { |
484 | struct ieee80211_local *local = sta->local; |
485 | struct ieee80211_if_ap *bss = sta->sdata->bss; |
486 | unsigned long flags; |
487 | bool indicate_tim = false; |
488 | u8 ignore_for_tim = sta->sta.uapsd_queues; |
489 | int ac; |
490 | |
491 | if (WARN_ON_ONCE(!sta->sdata->bss)) |
492 | return; |
493 | |
494 | /* No need to do anything if the driver does all */ |
495 | if (local->hw.flags & IEEE80211_HW_AP_LINK_PS) |
496 | return; |
497 | |
498 | if (sta->dead) |
499 | goto done; |
500 | |
501 | /* |
502 | * If all ACs are delivery-enabled then we should build |
503 | * the TIM bit for all ACs anyway; if only some are then |
504 | * we ignore those and build the TIM bit using only the |
505 | * non-enabled ones. |
506 | */ |
507 | if (ignore_for_tim == BIT(IEEE80211_NUM_ACS) - 1) |
508 | ignore_for_tim = 0; |
509 | |
510 | for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { |
511 | unsigned long tids; |
512 | |
513 | if (ignore_for_tim & BIT(ac)) |
514 | continue; |
515 | |
516 | indicate_tim |= !skb_queue_empty(&sta->tx_filtered[ac]) || |
517 | !skb_queue_empty(&sta->ps_tx_buf[ac]); |
518 | if (indicate_tim) |
519 | break; |
520 | |
521 | tids = ieee80211_tids_for_ac(ac); |
522 | |
523 | indicate_tim |= |
524 | sta->driver_buffered_tids & tids; |
525 | } |
526 | |
527 | done: |
528 | spin_lock_irqsave(&local->tim_lock, flags); |
529 | |
530 | if (indicate_tim) |
531 | __bss_tim_set(bss, sta->sta.aid); |
532 | else |
533 | __bss_tim_clear(bss, sta->sta.aid); |
534 | |
535 | if (local->ops->set_tim) { |
536 | local->tim_in_locked_section = true; |
537 | drv_set_tim(local, &sta->sta, indicate_tim); |
538 | local->tim_in_locked_section = false; |
539 | } |
540 | |
541 | spin_unlock_irqrestore(&local->tim_lock, flags); |
542 | } |
543 | |
544 | static bool sta_info_buffer_expired(struct sta_info *sta, struct sk_buff *skb) |
545 | { |
546 | struct ieee80211_tx_info *info; |
547 | int timeout; |
548 | |
549 | if (!skb) |
550 | return false; |
551 | |
552 | info = IEEE80211_SKB_CB(skb); |
553 | |
554 | /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */ |
555 | timeout = (sta->listen_interval * |
556 | sta->sdata->vif.bss_conf.beacon_int * |
557 | 32 / 15625) * HZ; |
558 | if (timeout < STA_TX_BUFFER_EXPIRE) |
559 | timeout = STA_TX_BUFFER_EXPIRE; |
560 | return time_after(jiffies, info->control.jiffies + timeout); |
561 | } |
562 | |
563 | |
564 | static bool sta_info_cleanup_expire_buffered_ac(struct ieee80211_local *local, |
565 | struct sta_info *sta, int ac) |
566 | { |
567 | unsigned long flags; |
568 | struct sk_buff *skb; |
569 | |
570 | /* |
571 | * First check for frames that should expire on the filtered |
572 | * queue. Frames here were rejected by the driver and are on |
573 | * a separate queue to avoid reordering with normal PS-buffered |
574 | * frames. They also aren't accounted for right now in the |
575 | * total_ps_buffered counter. |
576 | */ |
577 | for (;;) { |
578 | spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags); |
579 | skb = skb_peek(&sta->tx_filtered[ac]); |
580 | if (sta_info_buffer_expired(sta, skb)) |
581 | skb = __skb_dequeue(&sta->tx_filtered[ac]); |
582 | else |
583 | skb = NULL; |
584 | spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags); |
585 | |
586 | /* |
587 | * Frames are queued in order, so if this one |
588 | * hasn't expired yet we can stop testing. If |
589 | * we actually reached the end of the queue we |
590 | * also need to stop, of course. |
591 | */ |
592 | if (!skb) |
593 | break; |
594 | dev_kfree_skb(skb); |
595 | } |
596 | |
597 | /* |
598 | * Now also check the normal PS-buffered queue, this will |
599 | * only find something if the filtered queue was emptied |
600 | * since the filtered frames are all before the normal PS |
601 | * buffered frames. |
602 | */ |
603 | for (;;) { |
604 | spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags); |
605 | skb = skb_peek(&sta->ps_tx_buf[ac]); |
606 | if (sta_info_buffer_expired(sta, skb)) |
607 | skb = __skb_dequeue(&sta->ps_tx_buf[ac]); |
608 | else |
609 | skb = NULL; |
610 | spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags); |
611 | |
612 | /* |
613 | * frames are queued in order, so if this one |
614 | * hasn't expired yet (or we reached the end of |
615 | * the queue) we can stop testing |
616 | */ |
617 | if (!skb) |
618 | break; |
619 | |
620 | local->total_ps_buffered--; |
621 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
622 | printk(KERN_DEBUG "Buffered frame expired (STA %pM)\n", |
623 | sta->sta.addr); |
624 | #endif |
625 | dev_kfree_skb(skb); |
626 | } |
627 | |
628 | /* |
629 | * Finally, recalculate the TIM bit for this station -- it might |
630 | * now be clear because the station was too slow to retrieve its |
631 | * frames. |
632 | */ |
633 | sta_info_recalc_tim(sta); |
634 | |
635 | /* |
636 | * Return whether there are any frames still buffered, this is |
637 | * used to check whether the cleanup timer still needs to run, |
638 | * if there are no frames we don't need to rearm the timer. |
639 | */ |
640 | return !(skb_queue_empty(&sta->ps_tx_buf[ac]) && |
641 | skb_queue_empty(&sta->tx_filtered[ac])); |
642 | } |
643 | |
644 | static bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local, |
645 | struct sta_info *sta) |
646 | { |
647 | bool have_buffered = false; |
648 | int ac; |
649 | |
650 | /* This is only necessary for stations on BSS interfaces */ |
651 | if (!sta->sdata->bss) |
652 | return false; |
653 | |
654 | for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) |
655 | have_buffered |= |
656 | sta_info_cleanup_expire_buffered_ac(local, sta, ac); |
657 | |
658 | return have_buffered; |
659 | } |
660 | |
661 | int __must_check __sta_info_destroy(struct sta_info *sta) |
662 | { |
663 | struct ieee80211_local *local; |
664 | struct ieee80211_sub_if_data *sdata; |
665 | int ret, i, ac; |
666 | struct tid_ampdu_tx *tid_tx; |
667 | |
668 | might_sleep(); |
669 | |
670 | if (!sta) |
671 | return -ENOENT; |
672 | |
673 | local = sta->local; |
674 | sdata = sta->sdata; |
675 | |
676 | lockdep_assert_held(&local->sta_mtx); |
677 | |
678 | /* |
679 | * Before removing the station from the driver and |
680 | * rate control, it might still start new aggregation |
681 | * sessions -- block that to make sure the tear-down |
682 | * will be sufficient. |
683 | */ |
684 | set_sta_flag(sta, WLAN_STA_BLOCK_BA); |
685 | ieee80211_sta_tear_down_BA_sessions(sta, true); |
686 | |
687 | ret = sta_info_hash_del(local, sta); |
688 | if (ret) |
689 | return ret; |
690 | |
691 | list_del(&sta->list); |
692 | |
693 | mutex_lock(&local->key_mtx); |
694 | for (i = 0; i < NUM_DEFAULT_KEYS; i++) |
695 | __ieee80211_key_free(key_mtx_dereference(local, sta->gtk[i])); |
696 | if (sta->ptk) |
697 | __ieee80211_key_free(key_mtx_dereference(local, sta->ptk)); |
698 | mutex_unlock(&local->key_mtx); |
699 | |
700 | sta->dead = true; |
701 | |
702 | local->num_sta--; |
703 | local->sta_generation++; |
704 | |
705 | if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) |
706 | RCU_INIT_POINTER(sdata->u.vlan.sta, NULL); |
707 | |
708 | while (sta->sta_state > IEEE80211_STA_NONE) { |
709 | ret = sta_info_move_state(sta, sta->sta_state - 1); |
710 | if (ret) { |
711 | WARN_ON_ONCE(1); |
712 | break; |
713 | } |
714 | } |
715 | |
716 | if (sta->uploaded) { |
717 | ret = drv_sta_state(local, sdata, sta, IEEE80211_STA_NONE, |
718 | IEEE80211_STA_NOTEXIST); |
719 | WARN_ON_ONCE(ret != 0); |
720 | } |
721 | |
722 | /* |
723 | * At this point, after we wait for an RCU grace period, |
724 | * neither mac80211 nor the driver can reference this |
725 | * sta struct any more except by still existing timers |
726 | * associated with this station that we clean up below. |
727 | */ |
728 | synchronize_rcu(); |
729 | |
730 | if (test_sta_flag(sta, WLAN_STA_PS_STA)) { |
731 | BUG_ON(!sdata->bss); |
732 | |
733 | clear_sta_flag(sta, WLAN_STA_PS_STA); |
734 | |
735 | atomic_dec(&sdata->bss->num_sta_ps); |
736 | sta_info_recalc_tim(sta); |
737 | } |
738 | |
739 | for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { |
740 | local->total_ps_buffered -= skb_queue_len(&sta->ps_tx_buf[ac]); |
741 | __skb_queue_purge(&sta->ps_tx_buf[ac]); |
742 | __skb_queue_purge(&sta->tx_filtered[ac]); |
743 | } |
744 | |
745 | #ifdef CONFIG_MAC80211_MESH |
746 | if (ieee80211_vif_is_mesh(&sdata->vif)) |
747 | mesh_accept_plinks_update(sdata); |
748 | #endif |
749 | |
750 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
751 | wiphy_debug(local->hw.wiphy, "Removed STA %pM\n", sta->sta.addr); |
752 | #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */ |
753 | cancel_work_sync(&sta->drv_unblock_wk); |
754 | |
755 | cfg80211_del_sta(sdata->dev, sta->sta.addr, GFP_KERNEL); |
756 | |
757 | rate_control_remove_sta_debugfs(sta); |
758 | ieee80211_sta_debugfs_remove(sta); |
759 | |
760 | #ifdef CONFIG_MAC80211_MESH |
761 | if (ieee80211_vif_is_mesh(&sta->sdata->vif)) { |
762 | mesh_plink_deactivate(sta); |
763 | del_timer_sync(&sta->plink_timer); |
764 | } |
765 | #endif |
766 | |
767 | /* |
768 | * Destroy aggregation state here. It would be nice to wait for the |
769 | * driver to finish aggregation stop and then clean up, but for now |
770 | * drivers have to handle aggregation stop being requested, followed |
771 | * directly by station destruction. |
772 | */ |
773 | for (i = 0; i < STA_TID_NUM; i++) { |
774 | tid_tx = rcu_dereference_raw(sta->ampdu_mlme.tid_tx[i]); |
775 | if (!tid_tx) |
776 | continue; |
777 | __skb_queue_purge(&tid_tx->pending); |
778 | kfree(tid_tx); |
779 | } |
780 | |
781 | sta_info_free(local, sta); |
782 | |
783 | return 0; |
784 | } |
785 | |
786 | int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, const u8 *addr) |
787 | { |
788 | struct sta_info *sta; |
789 | int ret; |
790 | |
791 | mutex_lock(&sdata->local->sta_mtx); |
792 | sta = sta_info_get(sdata, addr); |
793 | ret = __sta_info_destroy(sta); |
794 | mutex_unlock(&sdata->local->sta_mtx); |
795 | |
796 | return ret; |
797 | } |
798 | |
799 | int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata, |
800 | const u8 *addr) |
801 | { |
802 | struct sta_info *sta; |
803 | int ret; |
804 | |
805 | mutex_lock(&sdata->local->sta_mtx); |
806 | sta = sta_info_get_bss(sdata, addr); |
807 | ret = __sta_info_destroy(sta); |
808 | mutex_unlock(&sdata->local->sta_mtx); |
809 | |
810 | return ret; |
811 | } |
812 | |
813 | static void sta_info_cleanup(unsigned long data) |
814 | { |
815 | struct ieee80211_local *local = (struct ieee80211_local *) data; |
816 | struct sta_info *sta; |
817 | bool timer_needed = false; |
818 | |
819 | rcu_read_lock(); |
820 | list_for_each_entry_rcu(sta, &local->sta_list, list) |
821 | if (sta_info_cleanup_expire_buffered(local, sta)) |
822 | timer_needed = true; |
823 | rcu_read_unlock(); |
824 | |
825 | if (local->quiescing) |
826 | return; |
827 | |
828 | if (!timer_needed) |
829 | return; |
830 | |
831 | mod_timer(&local->sta_cleanup, |
832 | round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL)); |
833 | } |
834 | |
835 | void sta_info_init(struct ieee80211_local *local) |
836 | { |
837 | spin_lock_init(&local->tim_lock); |
838 | mutex_init(&local->sta_mtx); |
839 | INIT_LIST_HEAD(&local->sta_list); |
840 | |
841 | setup_timer(&local->sta_cleanup, sta_info_cleanup, |
842 | (unsigned long)local); |
843 | } |
844 | |
845 | void sta_info_stop(struct ieee80211_local *local) |
846 | { |
847 | del_timer(&local->sta_cleanup); |
848 | sta_info_flush(local, NULL); |
849 | } |
850 | |
851 | /** |
852 | * sta_info_flush - flush matching STA entries from the STA table |
853 | * |
854 | * Returns the number of removed STA entries. |
855 | * |
856 | * @local: local interface data |
857 | * @sdata: matching rule for the net device (sta->dev) or %NULL to match all STAs |
858 | */ |
859 | int sta_info_flush(struct ieee80211_local *local, |
860 | struct ieee80211_sub_if_data *sdata) |
861 | { |
862 | struct sta_info *sta, *tmp; |
863 | int ret = 0; |
864 | |
865 | might_sleep(); |
866 | |
867 | mutex_lock(&local->sta_mtx); |
868 | list_for_each_entry_safe(sta, tmp, &local->sta_list, list) { |
869 | if (!sdata || sdata == sta->sdata) { |
870 | WARN_ON(__sta_info_destroy(sta)); |
871 | ret++; |
872 | } |
873 | } |
874 | mutex_unlock(&local->sta_mtx); |
875 | |
876 | return ret; |
877 | } |
878 | |
879 | void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata, |
880 | unsigned long exp_time) |
881 | { |
882 | struct ieee80211_local *local = sdata->local; |
883 | struct sta_info *sta, *tmp; |
884 | |
885 | mutex_lock(&local->sta_mtx); |
886 | |
887 | list_for_each_entry_safe(sta, tmp, &local->sta_list, list) { |
888 | if (sdata != sta->sdata) |
889 | continue; |
890 | |
891 | if (time_after(jiffies, sta->last_rx + exp_time)) { |
892 | #ifdef CONFIG_MAC80211_IBSS_DEBUG |
893 | printk(KERN_DEBUG "%s: expiring inactive STA %pM\n", |
894 | sdata->name, sta->sta.addr); |
895 | #endif |
896 | WARN_ON(__sta_info_destroy(sta)); |
897 | } |
898 | } |
899 | |
900 | mutex_unlock(&local->sta_mtx); |
901 | } |
902 | |
903 | struct ieee80211_sta *ieee80211_find_sta_by_ifaddr(struct ieee80211_hw *hw, |
904 | const u8 *addr, |
905 | const u8 *localaddr) |
906 | { |
907 | struct sta_info *sta, *nxt; |
908 | |
909 | /* |
910 | * Just return a random station if localaddr is NULL |
911 | * ... first in list. |
912 | */ |
913 | for_each_sta_info(hw_to_local(hw), addr, sta, nxt) { |
914 | if (localaddr && |
915 | compare_ether_addr(sta->sdata->vif.addr, localaddr) != 0) |
916 | continue; |
917 | if (!sta->uploaded) |
918 | return NULL; |
919 | return &sta->sta; |
920 | } |
921 | |
922 | return NULL; |
923 | } |
924 | EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr); |
925 | |
926 | struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif, |
927 | const u8 *addr) |
928 | { |
929 | struct sta_info *sta; |
930 | |
931 | if (!vif) |
932 | return NULL; |
933 | |
934 | sta = sta_info_get_bss(vif_to_sdata(vif), addr); |
935 | if (!sta) |
936 | return NULL; |
937 | |
938 | if (!sta->uploaded) |
939 | return NULL; |
940 | |
941 | return &sta->sta; |
942 | } |
943 | EXPORT_SYMBOL(ieee80211_find_sta); |
944 | |
945 | static void clear_sta_ps_flags(void *_sta) |
946 | { |
947 | struct sta_info *sta = _sta; |
948 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
949 | |
950 | clear_sta_flag(sta, WLAN_STA_PS_DRIVER); |
951 | if (test_and_clear_sta_flag(sta, WLAN_STA_PS_STA)) |
952 | atomic_dec(&sdata->bss->num_sta_ps); |
953 | } |
954 | |
955 | /* powersave support code */ |
956 | void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta) |
957 | { |
958 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
959 | struct ieee80211_local *local = sdata->local; |
960 | struct sk_buff_head pending; |
961 | int filtered = 0, buffered = 0, ac; |
962 | |
963 | clear_sta_flag(sta, WLAN_STA_SP); |
964 | |
965 | BUILD_BUG_ON(BITS_TO_LONGS(STA_TID_NUM) > 1); |
966 | sta->driver_buffered_tids = 0; |
967 | |
968 | if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS)) |
969 | drv_sta_notify(local, sdata, STA_NOTIFY_AWAKE, &sta->sta); |
970 | |
971 | skb_queue_head_init(&pending); |
972 | |
973 | /* Send all buffered frames to the station */ |
974 | for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { |
975 | int count = skb_queue_len(&pending), tmp; |
976 | |
977 | skb_queue_splice_tail_init(&sta->tx_filtered[ac], &pending); |
978 | tmp = skb_queue_len(&pending); |
979 | filtered += tmp - count; |
980 | count = tmp; |
981 | |
982 | skb_queue_splice_tail_init(&sta->ps_tx_buf[ac], &pending); |
983 | tmp = skb_queue_len(&pending); |
984 | buffered += tmp - count; |
985 | } |
986 | |
987 | ieee80211_add_pending_skbs_fn(local, &pending, clear_sta_ps_flags, sta); |
988 | |
989 | local->total_ps_buffered -= buffered; |
990 | |
991 | sta_info_recalc_tim(sta); |
992 | |
993 | #ifdef CONFIG_MAC80211_VERBOSE_PS_DEBUG |
994 | printk(KERN_DEBUG "%s: STA %pM aid %d sending %d filtered/%d PS frames " |
995 | "since STA not sleeping anymore\n", sdata->name, |
996 | sta->sta.addr, sta->sta.aid, filtered, buffered); |
997 | #endif /* CONFIG_MAC80211_VERBOSE_PS_DEBUG */ |
998 | } |
999 | |
1000 | static void ieee80211_send_null_response(struct ieee80211_sub_if_data *sdata, |
1001 | struct sta_info *sta, int tid, |
1002 | enum ieee80211_frame_release_type reason) |
1003 | { |
1004 | struct ieee80211_local *local = sdata->local; |
1005 | struct ieee80211_qos_hdr *nullfunc; |
1006 | struct sk_buff *skb; |
1007 | int size = sizeof(*nullfunc); |
1008 | __le16 fc; |
1009 | bool qos = test_sta_flag(sta, WLAN_STA_WME); |
1010 | struct ieee80211_tx_info *info; |
1011 | |
1012 | if (qos) { |
1013 | fc = cpu_to_le16(IEEE80211_FTYPE_DATA | |
1014 | IEEE80211_STYPE_QOS_NULLFUNC | |
1015 | IEEE80211_FCTL_FROMDS); |
1016 | } else { |
1017 | size -= 2; |
1018 | fc = cpu_to_le16(IEEE80211_FTYPE_DATA | |
1019 | IEEE80211_STYPE_NULLFUNC | |
1020 | IEEE80211_FCTL_FROMDS); |
1021 | } |
1022 | |
1023 | skb = dev_alloc_skb(local->hw.extra_tx_headroom + size); |
1024 | if (!skb) |
1025 | return; |
1026 | |
1027 | skb_reserve(skb, local->hw.extra_tx_headroom); |
1028 | |
1029 | nullfunc = (void *) skb_put(skb, size); |
1030 | nullfunc->frame_control = fc; |
1031 | nullfunc->duration_id = 0; |
1032 | memcpy(nullfunc->addr1, sta->sta.addr, ETH_ALEN); |
1033 | memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN); |
1034 | memcpy(nullfunc->addr3, sdata->vif.addr, ETH_ALEN); |
1035 | |
1036 | skb->priority = tid; |
1037 | skb_set_queue_mapping(skb, ieee802_1d_to_ac[tid]); |
1038 | if (qos) { |
1039 | nullfunc->qos_ctrl = cpu_to_le16(tid); |
1040 | |
1041 | if (reason == IEEE80211_FRAME_RELEASE_UAPSD) |
1042 | nullfunc->qos_ctrl |= |
1043 | cpu_to_le16(IEEE80211_QOS_CTL_EOSP); |
1044 | } |
1045 | |
1046 | info = IEEE80211_SKB_CB(skb); |
1047 | |
1048 | /* |
1049 | * Tell TX path to send this frame even though the |
1050 | * STA may still remain is PS mode after this frame |
1051 | * exchange. Also set EOSP to indicate this packet |
1052 | * ends the poll/service period. |
1053 | */ |
1054 | info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER | |
1055 | IEEE80211_TX_STATUS_EOSP | |
1056 | IEEE80211_TX_CTL_REQ_TX_STATUS; |
1057 | |
1058 | drv_allow_buffered_frames(local, sta, BIT(tid), 1, reason, false); |
1059 | |
1060 | ieee80211_xmit(sdata, skb); |
1061 | } |
1062 | |
1063 | static void |
1064 | ieee80211_sta_ps_deliver_response(struct sta_info *sta, |
1065 | int n_frames, u8 ignored_acs, |
1066 | enum ieee80211_frame_release_type reason) |
1067 | { |
1068 | struct ieee80211_sub_if_data *sdata = sta->sdata; |
1069 | struct ieee80211_local *local = sdata->local; |
1070 | bool found = false; |
1071 | bool more_data = false; |
1072 | int ac; |
1073 | unsigned long driver_release_tids = 0; |
1074 | struct sk_buff_head frames; |
1075 | |
1076 | /* Service or PS-Poll period starts */ |
1077 | set_sta_flag(sta, WLAN_STA_SP); |
1078 | |
1079 | __skb_queue_head_init(&frames); |
1080 | |
1081 | /* |
1082 | * Get response frame(s) and more data bit for it. |
1083 | */ |
1084 | for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) { |
1085 | unsigned long tids; |
1086 | |
1087 | if (ignored_acs & BIT(ac)) |
1088 | continue; |
1089 | |
1090 | tids = ieee80211_tids_for_ac(ac); |
1091 | |
1092 | if (!found) { |
1093 | driver_release_tids = sta->driver_buffered_tids & tids; |
1094 | if (driver_release_tids) { |
1095 | found = true; |
1096 | } else { |
1097 | struct sk_buff *skb; |
1098 | |
1099 | while (n_frames > 0) { |
1100 | skb = skb_dequeue(&sta->tx_filtered[ac]); |
1101 | if (!skb) { |
1102 | skb = skb_dequeue( |
1103 | &sta->ps_tx_buf[ac]); |
1104 | if (skb) |
1105 | local->total_ps_buffered--; |
1106 | } |
1107 | if (!skb) |
1108 | break; |
1109 | n_frames--; |
1110 | found = true; |
1111 | __skb_queue_tail(&frames, skb); |
1112 | } |
1113 | } |
1114 | |
1115 | /* |
1116 | * If the driver has data on more than one TID then |
1117 | * certainly there's more data if we release just a |
1118 | * single frame now (from a single TID). |
1119 | */ |
1120 | if (reason == IEEE80211_FRAME_RELEASE_PSPOLL && |
1121 | hweight16(driver_release_tids) > 1) { |
1122 | more_data = true; |
1123 | driver_release_tids = |
1124 | BIT(ffs(driver_release_tids) - 1); |
1125 | break; |
1126 | } |
1127 | } |
1128 | |
1129 | if (!skb_queue_empty(&sta->tx_filtered[ac]) || |
1130 | !skb_queue_empty(&sta->ps_tx_buf[ac])) { |
1131 | more_data = true; |
1132 | break; |
1133 | } |
1134 | } |
1135 | |
1136 | if (!found) { |
1137 | int tid; |
1138 | |
1139 | /* |
1140 | * For PS-Poll, this can only happen due to a race condition |
1141 | * when we set the TIM bit and the station notices it, but |
1142 | * before it can poll for the frame we expire it. |
1143 | * |
1144 | * For uAPSD, this is said in the standard (11.2.1.5 h): |
1145 | * At each unscheduled SP for a non-AP STA, the AP shall |
1146 | * attempt to transmit at least one MSDU or MMPDU, but no |
1147 | * more than the value specified in the Max SP Length field |
1148 | * in the QoS Capability element from delivery-enabled ACs, |
1149 | * that are destined for the non-AP STA. |
1150 | * |
1151 | * Since we have no other MSDU/MMPDU, transmit a QoS null frame. |
1152 | */ |
1153 | |
1154 | /* This will evaluate to 1, 3, 5 or 7. */ |
1155 | tid = 7 - ((ffs(~ignored_acs) - 1) << 1); |
1156 | |
1157 | ieee80211_send_null_response(sdata, sta, tid, reason); |
1158 | return; |
1159 | } |
1160 | |
1161 | if (!driver_release_tids) { |
1162 | struct sk_buff_head pending; |
1163 | struct sk_buff *skb; |
1164 | int num = 0; |
1165 | u16 tids = 0; |
1166 | |
1167 | skb_queue_head_init(&pending); |
1168 | |
1169 | while ((skb = __skb_dequeue(&frames))) { |
1170 | struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb); |
1171 | struct ieee80211_hdr *hdr = (void *) skb->data; |
1172 | u8 *qoshdr = NULL; |
1173 | |
1174 | num++; |
1175 | |
1176 | /* |
1177 | * Tell TX path to send this frame even though the |
1178 | * STA may still remain is PS mode after this frame |
1179 | * exchange. |
1180 | */ |
1181 | info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER; |
1182 | |
1183 | /* |
1184 | * Use MoreData flag to indicate whether there are |
1185 | * more buffered frames for this STA |
1186 | */ |
1187 | if (more_data || !skb_queue_empty(&frames)) |
1188 | hdr->frame_control |= |
1189 | cpu_to_le16(IEEE80211_FCTL_MOREDATA); |
1190 | else |
1191 | hdr->frame_control &= |
1192 | cpu_to_le16(~IEEE80211_FCTL_MOREDATA); |
1193 | |
1194 | if (ieee80211_is_data_qos(hdr->frame_control) || |
1195 | ieee80211_is_qos_nullfunc(hdr->frame_control)) |
1196 | qoshdr = ieee80211_get_qos_ctl(hdr); |
1197 | |
1198 | /* set EOSP for the frame */ |
1199 | if (reason == IEEE80211_FRAME_RELEASE_UAPSD && |
1200 | qoshdr && skb_queue_empty(&frames)) |
1201 | *qoshdr |= IEEE80211_QOS_CTL_EOSP; |
1202 | |
1203 | info->flags |= IEEE80211_TX_STATUS_EOSP | |
1204 | IEEE80211_TX_CTL_REQ_TX_STATUS; |
1205 | |
1206 | if (qoshdr) |
1207 | tids |= BIT(*qoshdr & IEEE80211_QOS_CTL_TID_MASK); |
1208 | else |
1209 | tids |= BIT(0); |
1210 | |
1211 | __skb_queue_tail(&pending, skb); |
1212 | } |
1213 | |
1214 | drv_allow_buffered_frames(local, sta, tids, num, |
1215 | reason, more_data); |
1216 | |
1217 | ieee80211_add_pending_skbs(local, &pending); |
1218 | |
1219 | sta_info_recalc_tim(sta); |
1220 | } else { |
1221 | /* |
1222 | * We need to release a frame that is buffered somewhere in the |
1223 | * driver ... it'll have to handle that. |
1224 | * Note that, as per the comment above, it'll also have to see |
1225 | * if there is more than just one frame on the specific TID that |
1226 | * we're releasing from, and it needs to set the more-data bit |
1227 | * accordingly if we tell it that there's no more data. If we do |
1228 | * tell it there's more data, then of course the more-data bit |
1229 | * needs to be set anyway. |
1230 | */ |
1231 | drv_release_buffered_frames(local, sta, driver_release_tids, |
1232 | n_frames, reason, more_data); |
1233 | |
1234 | /* |
1235 | * Note that we don't recalculate the TIM bit here as it would |
1236 | * most likely have no effect at all unless the driver told us |
1237 | * that the TID became empty before returning here from the |
1238 | * release function. |
1239 | * Either way, however, when the driver tells us that the TID |
1240 | * became empty we'll do the TIM recalculation. |
1241 | */ |
1242 | } |
1243 | } |
1244 | |
1245 | void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta) |
1246 | { |
1247 | u8 ignore_for_response = sta->sta.uapsd_queues; |
1248 | |
1249 | /* |
1250 | * If all ACs are delivery-enabled then we should reply |
1251 | * from any of them, if only some are enabled we reply |
1252 | * only from the non-enabled ones. |
1253 | */ |
1254 | if (ignore_for_response == BIT(IEEE80211_NUM_ACS) - 1) |
1255 | ignore_for_response = 0; |
1256 | |
1257 | ieee80211_sta_ps_deliver_response(sta, 1, ignore_for_response, |
1258 | IEEE80211_FRAME_RELEASE_PSPOLL); |
1259 | } |
1260 | |
1261 | void ieee80211_sta_ps_deliver_uapsd(struct sta_info *sta) |
1262 | { |
1263 | int n_frames = sta->sta.max_sp; |
1264 | u8 delivery_enabled = sta->sta.uapsd_queues; |
1265 | |
1266 | /* |
1267 | * If we ever grow support for TSPEC this might happen if |
1268 | * the TSPEC update from hostapd comes in between a trigger |
1269 | * frame setting WLAN_STA_UAPSD in the RX path and this |
1270 | * actually getting called. |
1271 | */ |
1272 | if (!delivery_enabled) |
1273 | return; |
1274 | |
1275 | switch (sta->sta.max_sp) { |
1276 | case 1: |
1277 | n_frames = 2; |
1278 | break; |
1279 | case 2: |
1280 | n_frames = 4; |
1281 | break; |
1282 | case 3: |
1283 | n_frames = 6; |
1284 | break; |
1285 | case 0: |
1286 | /* XXX: what is a good value? */ |
1287 | n_frames = 8; |
1288 | break; |
1289 | } |
1290 | |
1291 | ieee80211_sta_ps_deliver_response(sta, n_frames, ~delivery_enabled, |
1292 | IEEE80211_FRAME_RELEASE_UAPSD); |
1293 | } |
1294 | |
1295 | void ieee80211_sta_block_awake(struct ieee80211_hw *hw, |
1296 | struct ieee80211_sta *pubsta, bool block) |
1297 | { |
1298 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
1299 | |
1300 | trace_api_sta_block_awake(sta->local, pubsta, block); |
1301 | |
1302 | if (block) |
1303 | set_sta_flag(sta, WLAN_STA_PS_DRIVER); |
1304 | else if (test_sta_flag(sta, WLAN_STA_PS_DRIVER)) |
1305 | ieee80211_queue_work(hw, &sta->drv_unblock_wk); |
1306 | } |
1307 | EXPORT_SYMBOL(ieee80211_sta_block_awake); |
1308 | |
1309 | void ieee80211_sta_eosp_irqsafe(struct ieee80211_sta *pubsta) |
1310 | { |
1311 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
1312 | struct ieee80211_local *local = sta->local; |
1313 | struct sk_buff *skb; |
1314 | struct skb_eosp_msg_data *data; |
1315 | |
1316 | trace_api_eosp(local, pubsta); |
1317 | |
1318 | skb = alloc_skb(0, GFP_ATOMIC); |
1319 | if (!skb) { |
1320 | /* too bad ... but race is better than loss */ |
1321 | clear_sta_flag(sta, WLAN_STA_SP); |
1322 | return; |
1323 | } |
1324 | |
1325 | data = (void *)skb->cb; |
1326 | memcpy(data->sta, pubsta->addr, ETH_ALEN); |
1327 | memcpy(data->iface, sta->sdata->vif.addr, ETH_ALEN); |
1328 | skb->pkt_type = IEEE80211_EOSP_MSG; |
1329 | skb_queue_tail(&local->skb_queue, skb); |
1330 | tasklet_schedule(&local->tasklet); |
1331 | } |
1332 | EXPORT_SYMBOL(ieee80211_sta_eosp_irqsafe); |
1333 | |
1334 | void ieee80211_sta_set_buffered(struct ieee80211_sta *pubsta, |
1335 | u8 tid, bool buffered) |
1336 | { |
1337 | struct sta_info *sta = container_of(pubsta, struct sta_info, sta); |
1338 | |
1339 | if (WARN_ON(tid >= STA_TID_NUM)) |
1340 | return; |
1341 | |
1342 | if (buffered) |
1343 | set_bit(tid, &sta->driver_buffered_tids); |
1344 | else |
1345 | clear_bit(tid, &sta->driver_buffered_tids); |
1346 | |
1347 | sta_info_recalc_tim(sta); |
1348 | } |
1349 | EXPORT_SYMBOL(ieee80211_sta_set_buffered); |
1350 | |
1351 | int sta_info_move_state(struct sta_info *sta, |
1352 | enum ieee80211_sta_state new_state) |
1353 | { |
1354 | might_sleep(); |
1355 | |
1356 | if (sta->sta_state == new_state) |
1357 | return 0; |
1358 | |
1359 | /* check allowed transitions first */ |
1360 | |
1361 | switch (new_state) { |
1362 | case IEEE80211_STA_NONE: |
1363 | if (sta->sta_state != IEEE80211_STA_AUTH) |
1364 | return -EINVAL; |
1365 | break; |
1366 | case IEEE80211_STA_AUTH: |
1367 | if (sta->sta_state != IEEE80211_STA_NONE && |
1368 | sta->sta_state != IEEE80211_STA_ASSOC) |
1369 | return -EINVAL; |
1370 | break; |
1371 | case IEEE80211_STA_ASSOC: |
1372 | if (sta->sta_state != IEEE80211_STA_AUTH && |
1373 | sta->sta_state != IEEE80211_STA_AUTHORIZED) |
1374 | return -EINVAL; |
1375 | break; |
1376 | case IEEE80211_STA_AUTHORIZED: |
1377 | if (sta->sta_state != IEEE80211_STA_ASSOC) |
1378 | return -EINVAL; |
1379 | break; |
1380 | default: |
1381 | WARN(1, "invalid state %d", new_state); |
1382 | return -EINVAL; |
1383 | } |
1384 | |
1385 | #ifdef CONFIG_MAC80211_VERBOSE_DEBUG |
1386 | printk(KERN_DEBUG "%s: moving STA %pM to state %d\n", |
1387 | sta->sdata->name, sta->sta.addr, new_state); |
1388 | #endif |
1389 | |
1390 | /* |
1391 | * notify the driver before the actual changes so it can |
1392 | * fail the transition |
1393 | */ |
1394 | if (test_sta_flag(sta, WLAN_STA_INSERTED)) { |
1395 | int err = drv_sta_state(sta->local, sta->sdata, sta, |
1396 | sta->sta_state, new_state); |
1397 | if (err) |
1398 | return err; |
1399 | } |
1400 | |
1401 | /* reflect the change in all state variables */ |
1402 | |
1403 | switch (new_state) { |
1404 | case IEEE80211_STA_NONE: |
1405 | if (sta->sta_state == IEEE80211_STA_AUTH) |
1406 | clear_bit(WLAN_STA_AUTH, &sta->_flags); |
1407 | break; |
1408 | case IEEE80211_STA_AUTH: |
1409 | if (sta->sta_state == IEEE80211_STA_NONE) |
1410 | set_bit(WLAN_STA_AUTH, &sta->_flags); |
1411 | else if (sta->sta_state == IEEE80211_STA_ASSOC) |
1412 | clear_bit(WLAN_STA_ASSOC, &sta->_flags); |
1413 | break; |
1414 | case IEEE80211_STA_ASSOC: |
1415 | if (sta->sta_state == IEEE80211_STA_AUTH) { |
1416 | set_bit(WLAN_STA_ASSOC, &sta->_flags); |
1417 | } else if (sta->sta_state == IEEE80211_STA_AUTHORIZED) { |
1418 | if (sta->sdata->vif.type == NL80211_IFTYPE_AP) |
1419 | atomic_dec(&sta->sdata->u.ap.num_sta_authorized); |
1420 | clear_bit(WLAN_STA_AUTHORIZED, &sta->_flags); |
1421 | } |
1422 | break; |
1423 | case IEEE80211_STA_AUTHORIZED: |
1424 | if (sta->sta_state == IEEE80211_STA_ASSOC) { |
1425 | if (sta->sdata->vif.type == NL80211_IFTYPE_AP) |
1426 | atomic_inc(&sta->sdata->u.ap.num_sta_authorized); |
1427 | set_bit(WLAN_STA_AUTHORIZED, &sta->_flags); |
1428 | } |
1429 | break; |
1430 | default: |
1431 | break; |
1432 | } |
1433 | |
1434 | sta->sta_state = new_state; |
1435 | |
1436 | return 0; |
1437 | } |
1438 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9