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Linux 4.10-rc3
[linux/fpc-iii.git] / net / mac80211 / sta_info.c
blobb6cfcf038c11fa529e00da2eed70f6ff48426a37
1 /*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
4 * Copyright 2013-2014 Intel Mobile Communications GmbH
5 * Copyright (C) 2015 - 2016 Intel Deutschland GmbH
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/etherdevice.h>
15 #include <linux/netdevice.h>
16 #include <linux/types.h>
17 #include <linux/slab.h>
18 #include <linux/skbuff.h>
19 #include <linux/if_arp.h>
20 #include <linux/timer.h>
21 #include <linux/rtnetlink.h>
22
23 #include <net/mac80211.h>
24 #include "ieee80211_i.h"
25 #include "driver-ops.h"
26 #include "rate.h"
27 #include "sta_info.h"
28 #include "debugfs_sta.h"
29 #include "mesh.h"
30 #include "wme.h"
31
32 /**
33 * DOC: STA information lifetime rules
34 *
35 * STA info structures (&struct sta_info) are managed in a hash table
36 * for faster lookup and a list for iteration. They are managed using
37 * RCU, i.e. access to the list and hash table is protected by RCU.
38 *
39 * Upon allocating a STA info structure with sta_info_alloc(), the caller
40 * owns that structure. It must then insert it into the hash table using
41 * either sta_info_insert() or sta_info_insert_rcu(); only in the latter
42 * case (which acquires an rcu read section but must not be called from
43 * within one) will the pointer still be valid after the call. Note that
44 * the caller may not do much with the STA info before inserting it, in
45 * particular, it may not start any mesh peer link management or add
46 * encryption keys.
47 *
48 * When the insertion fails (sta_info_insert()) returns non-zero), the
49 * structure will have been freed by sta_info_insert()!
50 *
51 * Station entries are added by mac80211 when you establish a link with a
52 * peer. This means different things for the different type of interfaces
53 * we support. For a regular station this mean we add the AP sta when we
54 * receive an association response from the AP. For IBSS this occurs when
55 * get to know about a peer on the same IBSS. For WDS we add the sta for
56 * the peer immediately upon device open. When using AP mode we add stations
57 * for each respective station upon request from userspace through nl80211.
58 *
59 * In order to remove a STA info structure, various sta_info_destroy_*()
60 * calls are available.
61 *
62 * There is no concept of ownership on a STA entry, each structure is
63 * owned by the global hash table/list until it is removed. All users of
64 * the structure need to be RCU protected so that the structure won't be
65 * freed before they are done using it.
66 */
67
68 static const struct rhashtable_params sta_rht_params = {
69 .nelem_hint = 3, /* start small */
70 .automatic_shrinking = true,
71 .head_offset = offsetof(struct sta_info, hash_node),
72 .key_offset = offsetof(struct sta_info, addr),
73 .key_len = ETH_ALEN,
74 .max_size = CONFIG_MAC80211_STA_HASH_MAX_SIZE,
75 };
76
77 /* Caller must hold local->sta_mtx */
78 static int sta_info_hash_del(struct ieee80211_local *local,
79 struct sta_info *sta)
80 {
81 return rhltable_remove(&local->sta_hash, &sta->hash_node,
82 sta_rht_params);
83 }
84
85 static void __cleanup_single_sta(struct sta_info *sta)
86 {
87 int ac, i;
88 struct tid_ampdu_tx *tid_tx;
89 struct ieee80211_sub_if_data *sdata = sta->sdata;
90 struct ieee80211_local *local = sdata->local;
91 struct fq *fq = &local->fq;
92 struct ps_data *ps;
93
94 if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
95 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
96 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) {
97 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
98 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
99 ps = &sdata->bss->ps;
100 else if (ieee80211_vif_is_mesh(&sdata->vif))
101 ps = &sdata->u.mesh.ps;
102 else
103 return;
104
105 clear_sta_flag(sta, WLAN_STA_PS_STA);
106 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
107 clear_sta_flag(sta, WLAN_STA_PS_DELIVER);
108
109 atomic_dec(&ps->num_sta_ps);
110 }
111
112 if (sta->sta.txq[0]) {
113 for (i = 0; i < ARRAY_SIZE(sta->sta.txq); i++) {
114 struct txq_info *txqi = to_txq_info(sta->sta.txq[i]);
115
116 spin_lock_bh(&fq->lock);
117 ieee80211_txq_purge(local, txqi);
118 spin_unlock_bh(&fq->lock);
119 }
120 }
121
122 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
123 local->total_ps_buffered -= skb_queue_len(&sta->ps_tx_buf[ac]);
124 ieee80211_purge_tx_queue(&local->hw, &sta->ps_tx_buf[ac]);
125 ieee80211_purge_tx_queue(&local->hw, &sta->tx_filtered[ac]);
126 }
127
128 if (ieee80211_vif_is_mesh(&sdata->vif))
129 mesh_sta_cleanup(sta);
130
131 cancel_work_sync(&sta->drv_deliver_wk);
132
133 /*
134 * Destroy aggregation state here. It would be nice to wait for the
135 * driver to finish aggregation stop and then clean up, but for now
136 * drivers have to handle aggregation stop being requested, followed
137 * directly by station destruction.
138 */
139 for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
140 kfree(sta->ampdu_mlme.tid_start_tx[i]);
141 tid_tx = rcu_dereference_raw(sta->ampdu_mlme.tid_tx[i]);
142 if (!tid_tx)
143 continue;
144 ieee80211_purge_tx_queue(&local->hw, &tid_tx->pending);
145 kfree(tid_tx);
146 }
147 }
148
149 static void cleanup_single_sta(struct sta_info *sta)
150 {
151 struct ieee80211_sub_if_data *sdata = sta->sdata;
152 struct ieee80211_local *local = sdata->local;
153
154 __cleanup_single_sta(sta);
155 sta_info_free(local, sta);
156 }
157
158 struct rhlist_head *sta_info_hash_lookup(struct ieee80211_local *local,
159 const u8 *addr)
160 {
161 return rhltable_lookup(&local->sta_hash, addr, sta_rht_params);
162 }
163
164 /* protected by RCU */
165 struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata,
166 const u8 *addr)
167 {
168 struct ieee80211_local *local = sdata->local;
169 struct rhlist_head *tmp;
170 struct sta_info *sta;
171
172 rcu_read_lock();
173 for_each_sta_info(local, addr, sta, tmp) {
174 if (sta->sdata == sdata) {
175 rcu_read_unlock();
176 /* this is safe as the caller must already hold
177 * another rcu read section or the mutex
178 */
179 return sta;
180 }
181 }
182 rcu_read_unlock();
183 return NULL;
184 }
185
186 /*
187 * Get sta info either from the specified interface
188 * or from one of its vlans
189 */
190 struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata,
191 const u8 *addr)
192 {
193 struct ieee80211_local *local = sdata->local;
194 struct rhlist_head *tmp;
195 struct sta_info *sta;
196
197 rcu_read_lock();
198 for_each_sta_info(local, addr, sta, tmp) {
199 if (sta->sdata == sdata ||
200 (sta->sdata->bss && sta->sdata->bss == sdata->bss)) {
201 rcu_read_unlock();
202 /* this is safe as the caller must already hold
203 * another rcu read section or the mutex
204 */
205 return sta;
206 }
207 }
208 rcu_read_unlock();
209 return NULL;
210 }
211
212 struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
213 int idx)
214 {
215 struct ieee80211_local *local = sdata->local;
216 struct sta_info *sta;
217 int i = 0;
218
219 list_for_each_entry_rcu(sta, &local->sta_list, list) {
220 if (sdata != sta->sdata)
221 continue;
222 if (i < idx) {
223 ++i;
224 continue;
225 }
226 return sta;
227 }
228
229 return NULL;
230 }
231
232 /**
233 * sta_info_free - free STA
234 *
235 * @local: pointer to the global information
236 * @sta: STA info to free
237 *
238 * This function must undo everything done by sta_info_alloc()
239 * that may happen before sta_info_insert(). It may only be
240 * called when sta_info_insert() has not been attempted (and
241 * if that fails, the station is freed anyway.)
242 */
243 void sta_info_free(struct ieee80211_local *local, struct sta_info *sta)
244 {
245 if (sta->rate_ctrl)
246 rate_control_free_sta(sta);
247
248 sta_dbg(sta->sdata, "Destroyed STA %pM\n", sta->sta.addr);
249
250 if (sta->sta.txq[0])
251 kfree(to_txq_info(sta->sta.txq[0]));
252 kfree(rcu_dereference_raw(sta->sta.rates));
253 #ifdef CONFIG_MAC80211_MESH
254 kfree(sta->mesh);
255 #endif
256 free_percpu(sta->pcpu_rx_stats);
257 kfree(sta);
258 }
259
260 /* Caller must hold local->sta_mtx */
261 static int sta_info_hash_add(struct ieee80211_local *local,
262 struct sta_info *sta)
263 {
264 return rhltable_insert(&local->sta_hash, &sta->hash_node,
265 sta_rht_params);
266 }
267
268 static void sta_deliver_ps_frames(struct work_struct *wk)
269 {
270 struct sta_info *sta;
271
272 sta = container_of(wk, struct sta_info, drv_deliver_wk);
273
274 if (sta->dead)
275 return;
276
277 local_bh_disable();
278 if (!test_sta_flag(sta, WLAN_STA_PS_STA))
279 ieee80211_sta_ps_deliver_wakeup(sta);
280 else if (test_and_clear_sta_flag(sta, WLAN_STA_PSPOLL))
281 ieee80211_sta_ps_deliver_poll_response(sta);
282 else if (test_and_clear_sta_flag(sta, WLAN_STA_UAPSD))
283 ieee80211_sta_ps_deliver_uapsd(sta);
284 local_bh_enable();
285 }
286
287 static int sta_prepare_rate_control(struct ieee80211_local *local,
288 struct sta_info *sta, gfp_t gfp)
289 {
290 if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL))
291 return 0;
292
293 sta->rate_ctrl = local->rate_ctrl;
294 sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl,
295 sta, gfp);
296 if (!sta->rate_ctrl_priv)
297 return -ENOMEM;
298
299 return 0;
300 }
301
302 struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
303 const u8 *addr, gfp_t gfp)
304 {
305 struct ieee80211_local *local = sdata->local;
306 struct ieee80211_hw *hw = &local->hw;
307 struct sta_info *sta;
308 int i;
309
310 sta = kzalloc(sizeof(*sta) + hw->sta_data_size, gfp);
311 if (!sta)
312 return NULL;
313
314 if (ieee80211_hw_check(hw, USES_RSS)) {
315 sta->pcpu_rx_stats =
316 alloc_percpu(struct ieee80211_sta_rx_stats);
317 if (!sta->pcpu_rx_stats)
318 goto free;
319 }
320
321 spin_lock_init(&sta->lock);
322 spin_lock_init(&sta->ps_lock);
323 INIT_WORK(&sta->drv_deliver_wk, sta_deliver_ps_frames);
324 INIT_WORK(&sta->ampdu_mlme.work, ieee80211_ba_session_work);
325 mutex_init(&sta->ampdu_mlme.mtx);
326 #ifdef CONFIG_MAC80211_MESH
327 if (ieee80211_vif_is_mesh(&sdata->vif)) {
328 sta->mesh = kzalloc(sizeof(*sta->mesh), gfp);
329 if (!sta->mesh)
330 goto free;
331 spin_lock_init(&sta->mesh->plink_lock);
332 if (ieee80211_vif_is_mesh(&sdata->vif) &&
333 !sdata->u.mesh.user_mpm)
334 init_timer(&sta->mesh->plink_timer);
335 sta->mesh->nonpeer_pm = NL80211_MESH_POWER_ACTIVE;
336 }
337 #endif
338
339 memcpy(sta->addr, addr, ETH_ALEN);
340 memcpy(sta->sta.addr, addr, ETH_ALEN);
341 sta->sta.max_rx_aggregation_subframes =
342 local->hw.max_rx_aggregation_subframes;
343
344 sta->local = local;
345 sta->sdata = sdata;
346 sta->rx_stats.last_rx = jiffies;
347
348 u64_stats_init(&sta->rx_stats.syncp);
349
350 sta->sta_state = IEEE80211_STA_NONE;
351
352 /* Mark TID as unreserved */
353 sta->reserved_tid = IEEE80211_TID_UNRESERVED;
354
355 sta->last_connected = ktime_get_seconds();
356 ewma_signal_init(&sta->rx_stats_avg.signal);
357 for (i = 0; i < ARRAY_SIZE(sta->rx_stats_avg.chain_signal); i++)
358 ewma_signal_init(&sta->rx_stats_avg.chain_signal[i]);
359
360 if (local->ops->wake_tx_queue) {
361 void *txq_data;
362 int size = sizeof(struct txq_info) +
363 ALIGN(hw->txq_data_size, sizeof(void *));
364
365 txq_data = kcalloc(ARRAY_SIZE(sta->sta.txq), size, gfp);
366 if (!txq_data)
367 goto free;
368
369 for (i = 0; i < ARRAY_SIZE(sta->sta.txq); i++) {
370 struct txq_info *txq = txq_data + i * size;
371
372 ieee80211_txq_init(sdata, sta, txq, i);
373 }
374 }
375
376 if (sta_prepare_rate_control(local, sta, gfp))
377 goto free_txq;
378
379 for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
380 /*
381 * timer_to_tid must be initialized with identity mapping
382 * to enable session_timer's data differentiation. See
383 * sta_rx_agg_session_timer_expired for usage.
384 */
385 sta->timer_to_tid[i] = i;
386 }
387 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
388 skb_queue_head_init(&sta->ps_tx_buf[i]);
389 skb_queue_head_init(&sta->tx_filtered[i]);
390 }
391
392 for (i = 0; i < IEEE80211_NUM_TIDS; i++)
393 sta->last_seq_ctrl[i] = cpu_to_le16(USHRT_MAX);
394
395 sta->sta.smps_mode = IEEE80211_SMPS_OFF;
396 if (sdata->vif.type == NL80211_IFTYPE_AP ||
397 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
398 struct ieee80211_supported_band *sband =
399 hw->wiphy->bands[ieee80211_get_sdata_band(sdata)];
400 u8 smps = (sband->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >>
401 IEEE80211_HT_CAP_SM_PS_SHIFT;
402 /*
403 * Assume that hostapd advertises our caps in the beacon and
404 * this is the known_smps_mode for a station that just assciated
405 */
406 switch (smps) {
407 case WLAN_HT_SMPS_CONTROL_DISABLED:
408 sta->known_smps_mode = IEEE80211_SMPS_OFF;
409 break;
410 case WLAN_HT_SMPS_CONTROL_STATIC:
411 sta->known_smps_mode = IEEE80211_SMPS_STATIC;
412 break;
413 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
414 sta->known_smps_mode = IEEE80211_SMPS_DYNAMIC;
415 break;
416 default:
417 WARN_ON(1);
418 }
419 }
420
421 sta->sta.max_rc_amsdu_len = IEEE80211_MAX_MPDU_LEN_HT_BA;
422
423 sta_dbg(sdata, "Allocated STA %pM\n", sta->sta.addr);
424
425 return sta;
426
427 free_txq:
428 if (sta->sta.txq[0])
429 kfree(to_txq_info(sta->sta.txq[0]));
430 free:
431 #ifdef CONFIG_MAC80211_MESH
432 kfree(sta->mesh);
433 #endif
434 kfree(sta);
435 return NULL;
436 }
437
438 static int sta_info_insert_check(struct sta_info *sta)
439 {
440 struct ieee80211_sub_if_data *sdata = sta->sdata;
441
442 /*
443 * Can't be a WARN_ON because it can be triggered through a race:
444 * something inserts a STA (on one CPU) without holding the RTNL
445 * and another CPU turns off the net device.
446 */
447 if (unlikely(!ieee80211_sdata_running(sdata)))
448 return -ENETDOWN;
449
450 if (WARN_ON(ether_addr_equal(sta->sta.addr, sdata->vif.addr) ||
451 is_multicast_ether_addr(sta->sta.addr)))
452 return -EINVAL;
453
454 /* The RCU read lock is required by rhashtable due to
455 * asynchronous resize/rehash. We also require the mutex
456 * for correctness.
457 */
458 rcu_read_lock();
459 lockdep_assert_held(&sdata->local->sta_mtx);
460 if (ieee80211_hw_check(&sdata->local->hw, NEEDS_UNIQUE_STA_ADDR) &&
461 ieee80211_find_sta_by_ifaddr(&sdata->local->hw, sta->addr, NULL)) {
462 rcu_read_unlock();
463 return -ENOTUNIQ;
464 }
465 rcu_read_unlock();
466
467 return 0;
468 }
469
470 static int sta_info_insert_drv_state(struct ieee80211_local *local,
471 struct ieee80211_sub_if_data *sdata,
472 struct sta_info *sta)
473 {
474 enum ieee80211_sta_state state;
475 int err = 0;
476
477 for (state = IEEE80211_STA_NOTEXIST; state < sta->sta_state; state++) {
478 err = drv_sta_state(local, sdata, sta, state, state + 1);
479 if (err)
480 break;
481 }
482
483 if (!err) {
484 /*
485 * Drivers using legacy sta_add/sta_remove callbacks only
486 * get uploaded set to true after sta_add is called.
487 */
488 if (!local->ops->sta_add)
489 sta->uploaded = true;
490 return 0;
491 }
492
493 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
494 sdata_info(sdata,
495 "failed to move IBSS STA %pM to state %d (%d) - keeping it anyway\n",
496 sta->sta.addr, state + 1, err);
497 err = 0;
498 }
499
500 /* unwind on error */
501 for (; state > IEEE80211_STA_NOTEXIST; state--)
502 WARN_ON(drv_sta_state(local, sdata, sta, state, state - 1));
503
504 return err;
505 }
506
507 /*
508 * should be called with sta_mtx locked
509 * this function replaces the mutex lock
510 * with a RCU lock
511 */
512 static int sta_info_insert_finish(struct sta_info *sta) __acquires(RCU)
513 {
514 struct ieee80211_local *local = sta->local;
515 struct ieee80211_sub_if_data *sdata = sta->sdata;
516 struct station_info *sinfo;
517 int err = 0;
518
519 lockdep_assert_held(&local->sta_mtx);
520
521 sinfo = kzalloc(sizeof(struct station_info), GFP_KERNEL);
522 if (!sinfo) {
523 err = -ENOMEM;
524 goto out_err;
525 }
526
527 /* check if STA exists already */
528 if (sta_info_get_bss(sdata, sta->sta.addr)) {
529 err = -EEXIST;
530 goto out_err;
531 }
532
533 local->num_sta++;
534 local->sta_generation++;
535 smp_mb();
536
537 /* simplify things and don't accept BA sessions yet */
538 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
539
540 /* make the station visible */
541 err = sta_info_hash_add(local, sta);
542 if (err)
543 goto out_drop_sta;
544
545 list_add_tail_rcu(&sta->list, &local->sta_list);
546
547 /* notify driver */
548 err = sta_info_insert_drv_state(local, sdata, sta);
549 if (err)
550 goto out_remove;
551
552 set_sta_flag(sta, WLAN_STA_INSERTED);
553 /* accept BA sessions now */
554 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
555
556 ieee80211_sta_debugfs_add(sta);
557 rate_control_add_sta_debugfs(sta);
558
559 sinfo->generation = local->sta_generation;
560 cfg80211_new_sta(sdata->dev, sta->sta.addr, sinfo, GFP_KERNEL);
561 kfree(sinfo);
562
563 sta_dbg(sdata, "Inserted STA %pM\n", sta->sta.addr);
564
565 /* move reference to rcu-protected */
566 rcu_read_lock();
567 mutex_unlock(&local->sta_mtx);
568
569 if (ieee80211_vif_is_mesh(&sdata->vif))
570 mesh_accept_plinks_update(sdata);
571
572 return 0;
573 out_remove:
574 sta_info_hash_del(local, sta);
575 list_del_rcu(&sta->list);
576 out_drop_sta:
577 local->num_sta--;
578 synchronize_net();
579 __cleanup_single_sta(sta);
580 out_err:
581 mutex_unlock(&local->sta_mtx);
582 kfree(sinfo);
583 rcu_read_lock();
584 return err;
585 }
586
587 int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU)
588 {
589 struct ieee80211_local *local = sta->local;
590 int err;
591
592 might_sleep();
593
594 mutex_lock(&local->sta_mtx);
595
596 err = sta_info_insert_check(sta);
597 if (err) {
598 mutex_unlock(&local->sta_mtx);
599 rcu_read_lock();
600 goto out_free;
601 }
602
603 err = sta_info_insert_finish(sta);
604 if (err)
605 goto out_free;
606
607 return 0;
608 out_free:
609 sta_info_free(local, sta);
610 return err;
611 }
612
613 int sta_info_insert(struct sta_info *sta)
614 {
615 int err = sta_info_insert_rcu(sta);
616
617 rcu_read_unlock();
618
619 return err;
620 }
621
622 static inline void __bss_tim_set(u8 *tim, u16 id)
623 {
624 /*
625 * This format has been mandated by the IEEE specifications,
626 * so this line may not be changed to use the __set_bit() format.
627 */
628 tim[id / 8] |= (1 << (id % 8));
629 }
630
631 static inline void __bss_tim_clear(u8 *tim, u16 id)
632 {
633 /*
634 * This format has been mandated by the IEEE specifications,
635 * so this line may not be changed to use the __clear_bit() format.
636 */
637 tim[id / 8] &= ~(1 << (id % 8));
638 }
639
640 static inline bool __bss_tim_get(u8 *tim, u16 id)
641 {
642 /*
643 * This format has been mandated by the IEEE specifications,
644 * so this line may not be changed to use the test_bit() format.
645 */
646 return tim[id / 8] & (1 << (id % 8));
647 }
648
649 static unsigned long ieee80211_tids_for_ac(int ac)
650 {
651 /* If we ever support TIDs > 7, this obviously needs to be adjusted */
652 switch (ac) {
653 case IEEE80211_AC_VO:
654 return BIT(6) | BIT(7);
655 case IEEE80211_AC_VI:
656 return BIT(4) | BIT(5);
657 case IEEE80211_AC_BE:
658 return BIT(0) | BIT(3);
659 case IEEE80211_AC_BK:
660 return BIT(1) | BIT(2);
661 default:
662 WARN_ON(1);
663 return 0;
664 }
665 }
666
667 static void __sta_info_recalc_tim(struct sta_info *sta, bool ignore_pending)
668 {
669 struct ieee80211_local *local = sta->local;
670 struct ps_data *ps;
671 bool indicate_tim = false;
672 u8 ignore_for_tim = sta->sta.uapsd_queues;
673 int ac;
674 u16 id = sta->sta.aid;
675
676 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
677 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
678 if (WARN_ON_ONCE(!sta->sdata->bss))
679 return;
680
681 ps = &sta->sdata->bss->ps;
682 #ifdef CONFIG_MAC80211_MESH
683 } else if (ieee80211_vif_is_mesh(&sta->sdata->vif)) {
684 ps = &sta->sdata->u.mesh.ps;
685 #endif
686 } else {
687 return;
688 }
689
690 /* No need to do anything if the driver does all */
691 if (ieee80211_hw_check(&local->hw, AP_LINK_PS))
692 return;
693
694 if (sta->dead)
695 goto done;
696
697 /*
698 * If all ACs are delivery-enabled then we should build
699 * the TIM bit for all ACs anyway; if only some are then
700 * we ignore those and build the TIM bit using only the
701 * non-enabled ones.
702 */
703 if (ignore_for_tim == BIT(IEEE80211_NUM_ACS) - 1)
704 ignore_for_tim = 0;
705
706 if (ignore_pending)
707 ignore_for_tim = BIT(IEEE80211_NUM_ACS) - 1;
708
709 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
710 unsigned long tids;
711
712 if (ignore_for_tim & ieee80211_ac_to_qos_mask[ac])
713 continue;
714
715 indicate_tim |= !skb_queue_empty(&sta->tx_filtered[ac]) ||
716 !skb_queue_empty(&sta->ps_tx_buf[ac]);
717 if (indicate_tim)
718 break;
719
720 tids = ieee80211_tids_for_ac(ac);
721
722 indicate_tim |=
723 sta->driver_buffered_tids & tids;
724 indicate_tim |=
725 sta->txq_buffered_tids & tids;
726 }
727
728 done:
729 spin_lock_bh(&local->tim_lock);
730
731 if (indicate_tim == __bss_tim_get(ps->tim, id))
732 goto out_unlock;
733
734 if (indicate_tim)
735 __bss_tim_set(ps->tim, id);
736 else
737 __bss_tim_clear(ps->tim, id);
738
739 if (local->ops->set_tim && !WARN_ON(sta->dead)) {
740 local->tim_in_locked_section = true;
741 drv_set_tim(local, &sta->sta, indicate_tim);
742 local->tim_in_locked_section = false;
743 }
744
745 out_unlock:
746 spin_unlock_bh(&local->tim_lock);
747 }
748
749 void sta_info_recalc_tim(struct sta_info *sta)
750 {
751 __sta_info_recalc_tim(sta, false);
752 }
753
754 static bool sta_info_buffer_expired(struct sta_info *sta, struct sk_buff *skb)
755 {
756 struct ieee80211_tx_info *info;
757 int timeout;
758
759 if (!skb)
760 return false;
761
762 info = IEEE80211_SKB_CB(skb);
763
764 /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
765 timeout = (sta->listen_interval *
766 sta->sdata->vif.bss_conf.beacon_int *
767 32 / 15625) * HZ;
768 if (timeout < STA_TX_BUFFER_EXPIRE)
769 timeout = STA_TX_BUFFER_EXPIRE;
770 return time_after(jiffies, info->control.jiffies + timeout);
771 }
772
773
774 static bool sta_info_cleanup_expire_buffered_ac(struct ieee80211_local *local,
775 struct sta_info *sta, int ac)
776 {
777 unsigned long flags;
778 struct sk_buff *skb;
779
780 /*
781 * First check for frames that should expire on the filtered
782 * queue. Frames here were rejected by the driver and are on
783 * a separate queue to avoid reordering with normal PS-buffered
784 * frames. They also aren't accounted for right now in the
785 * total_ps_buffered counter.
786 */
787 for (;;) {
788 spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
789 skb = skb_peek(&sta->tx_filtered[ac]);
790 if (sta_info_buffer_expired(sta, skb))
791 skb = __skb_dequeue(&sta->tx_filtered[ac]);
792 else
793 skb = NULL;
794 spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
795
796 /*
797 * Frames are queued in order, so if this one
798 * hasn't expired yet we can stop testing. If
799 * we actually reached the end of the queue we
800 * also need to stop, of course.
801 */
802 if (!skb)
803 break;
804 ieee80211_free_txskb(&local->hw, skb);
805 }
806
807 /*
808 * Now also check the normal PS-buffered queue, this will
809 * only find something if the filtered queue was emptied
810 * since the filtered frames are all before the normal PS
811 * buffered frames.
812 */
813 for (;;) {
814 spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
815 skb = skb_peek(&sta->ps_tx_buf[ac]);
816 if (sta_info_buffer_expired(sta, skb))
817 skb = __skb_dequeue(&sta->ps_tx_buf[ac]);
818 else
819 skb = NULL;
820 spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
821
822 /*
823 * frames are queued in order, so if this one
824 * hasn't expired yet (or we reached the end of
825 * the queue) we can stop testing
826 */
827 if (!skb)
828 break;
829
830 local->total_ps_buffered--;
831 ps_dbg(sta->sdata, "Buffered frame expired (STA %pM)\n",
832 sta->sta.addr);
833 ieee80211_free_txskb(&local->hw, skb);
834 }
835
836 /*
837 * Finally, recalculate the TIM bit for this station -- it might
838 * now be clear because the station was too slow to retrieve its
839 * frames.
840 */
841 sta_info_recalc_tim(sta);
842
843 /*
844 * Return whether there are any frames still buffered, this is
845 * used to check whether the cleanup timer still needs to run,
846 * if there are no frames we don't need to rearm the timer.
847 */
848 return !(skb_queue_empty(&sta->ps_tx_buf[ac]) &&
849 skb_queue_empty(&sta->tx_filtered[ac]));
850 }
851
852 static bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
853 struct sta_info *sta)
854 {
855 bool have_buffered = false;
856 int ac;
857
858 /* This is only necessary for stations on BSS/MBSS interfaces */
859 if (!sta->sdata->bss &&
860 !ieee80211_vif_is_mesh(&sta->sdata->vif))
861 return false;
862
863 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
864 have_buffered |=
865 sta_info_cleanup_expire_buffered_ac(local, sta, ac);
866
867 return have_buffered;
868 }
869
870 static int __must_check __sta_info_destroy_part1(struct sta_info *sta)
871 {
872 struct ieee80211_local *local;
873 struct ieee80211_sub_if_data *sdata;
874 int ret;
875
876 might_sleep();
877
878 if (!sta)
879 return -ENOENT;
880
881 local = sta->local;
882 sdata = sta->sdata;
883
884 lockdep_assert_held(&local->sta_mtx);
885
886 /*
887 * Before removing the station from the driver and
888 * rate control, it might still start new aggregation
889 * sessions -- block that to make sure the tear-down
890 * will be sufficient.
891 */
892 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
893 ieee80211_sta_tear_down_BA_sessions(sta, AGG_STOP_DESTROY_STA);
894
895 /*
896 * Before removing the station from the driver there might be pending
897 * rx frames on RSS queues sent prior to the disassociation - wait for
898 * all such frames to be processed.
899 */
900 drv_sync_rx_queues(local, sta);
901
902 ret = sta_info_hash_del(local, sta);
903 if (WARN_ON(ret))
904 return ret;
905
906 /*
907 * for TDLS peers, make sure to return to the base channel before
908 * removal.
909 */
910 if (test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) {
911 drv_tdls_cancel_channel_switch(local, sdata, &sta->sta);
912 clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
913 }
914
915 list_del_rcu(&sta->list);
916 sta->removed = true;
917
918 drv_sta_pre_rcu_remove(local, sta->sdata, sta);
919
920 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
921 rcu_access_pointer(sdata->u.vlan.sta) == sta)
922 RCU_INIT_POINTER(sdata->u.vlan.sta, NULL);
923
924 return 0;
925 }
926
927 static void __sta_info_destroy_part2(struct sta_info *sta)
928 {
929 struct ieee80211_local *local = sta->local;
930 struct ieee80211_sub_if_data *sdata = sta->sdata;
931 struct station_info *sinfo;
932 int ret;
933
934 /*
935 * NOTE: This assumes at least synchronize_net() was done
936 * after _part1 and before _part2!
937 */
938
939 might_sleep();
940 lockdep_assert_held(&local->sta_mtx);
941
942 /* now keys can no longer be reached */
943 ieee80211_free_sta_keys(local, sta);
944
945 /* disable TIM bit - last chance to tell driver */
946 __sta_info_recalc_tim(sta, true);
947
948 sta->dead = true;
949
950 local->num_sta--;
951 local->sta_generation++;
952
953 while (sta->sta_state > IEEE80211_STA_NONE) {
954 ret = sta_info_move_state(sta, sta->sta_state - 1);
955 if (ret) {
956 WARN_ON_ONCE(1);
957 break;
958 }
959 }
960
961 if (sta->uploaded) {
962 ret = drv_sta_state(local, sdata, sta, IEEE80211_STA_NONE,
963 IEEE80211_STA_NOTEXIST);
964 WARN_ON_ONCE(ret != 0);
965 }
966
967 sta_dbg(sdata, "Removed STA %pM\n", sta->sta.addr);
968
969 sinfo = kzalloc(sizeof(*sinfo), GFP_KERNEL);
970 if (sinfo)
971 sta_set_sinfo(sta, sinfo);
972 cfg80211_del_sta_sinfo(sdata->dev, sta->sta.addr, sinfo, GFP_KERNEL);
973 kfree(sinfo);
974
975 rate_control_remove_sta_debugfs(sta);
976 ieee80211_sta_debugfs_remove(sta);
977
978 cleanup_single_sta(sta);
979 }
980
981 int __must_check __sta_info_destroy(struct sta_info *sta)
982 {
983 int err = __sta_info_destroy_part1(sta);
984
985 if (err)
986 return err;
987
988 synchronize_net();
989
990 __sta_info_destroy_part2(sta);
991
992 return 0;
993 }
994
995 int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, const u8 *addr)
996 {
997 struct sta_info *sta;
998 int ret;
999
1000 mutex_lock(&sdata->local->sta_mtx);
1001 sta = sta_info_get(sdata, addr);
1002 ret = __sta_info_destroy(sta);
1003 mutex_unlock(&sdata->local->sta_mtx);
1004
1005 return ret;
1006 }
1007
1008 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
1009 const u8 *addr)
1010 {
1011 struct sta_info *sta;
1012 int ret;
1013
1014 mutex_lock(&sdata->local->sta_mtx);
1015 sta = sta_info_get_bss(sdata, addr);
1016 ret = __sta_info_destroy(sta);
1017 mutex_unlock(&sdata->local->sta_mtx);
1018
1019 return ret;
1020 }
1021
1022 static void sta_info_cleanup(unsigned long data)
1023 {
1024 struct ieee80211_local *local = (struct ieee80211_local *) data;
1025 struct sta_info *sta;
1026 bool timer_needed = false;
1027
1028 rcu_read_lock();
1029 list_for_each_entry_rcu(sta, &local->sta_list, list)
1030 if (sta_info_cleanup_expire_buffered(local, sta))
1031 timer_needed = true;
1032 rcu_read_unlock();
1033
1034 if (local->quiescing)
1035 return;
1036
1037 if (!timer_needed)
1038 return;
1039
1040 mod_timer(&local->sta_cleanup,
1041 round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL));
1042 }
1043
1044 int sta_info_init(struct ieee80211_local *local)
1045 {
1046 int err;
1047
1048 err = rhltable_init(&local->sta_hash, &sta_rht_params);
1049 if (err)
1050 return err;
1051
1052 spin_lock_init(&local->tim_lock);
1053 mutex_init(&local->sta_mtx);
1054 INIT_LIST_HEAD(&local->sta_list);
1055
1056 setup_timer(&local->sta_cleanup, sta_info_cleanup,
1057 (unsigned long)local);
1058 return 0;
1059 }
1060
1061 void sta_info_stop(struct ieee80211_local *local)
1062 {
1063 del_timer_sync(&local->sta_cleanup);
1064 rhltable_destroy(&local->sta_hash);
1065 }
1066
1067
1068 int __sta_info_flush(struct ieee80211_sub_if_data *sdata, bool vlans)
1069 {
1070 struct ieee80211_local *local = sdata->local;
1071 struct sta_info *sta, *tmp;
1072 LIST_HEAD(free_list);
1073 int ret = 0;
1074
1075 might_sleep();
1076
1077 WARN_ON(vlans && sdata->vif.type != NL80211_IFTYPE_AP);
1078 WARN_ON(vlans && !sdata->bss);
1079
1080 mutex_lock(&local->sta_mtx);
1081 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1082 if (sdata == sta->sdata ||
1083 (vlans && sdata->bss == sta->sdata->bss)) {
1084 if (!WARN_ON(__sta_info_destroy_part1(sta)))
1085 list_add(&sta->free_list, &free_list);
1086 ret++;
1087 }
1088 }
1089
1090 if (!list_empty(&free_list)) {
1091 synchronize_net();
1092 list_for_each_entry_safe(sta, tmp, &free_list, free_list)
1093 __sta_info_destroy_part2(sta);
1094 }
1095 mutex_unlock(&local->sta_mtx);
1096
1097 return ret;
1098 }
1099
1100 void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
1101 unsigned long exp_time)
1102 {
1103 struct ieee80211_local *local = sdata->local;
1104 struct sta_info *sta, *tmp;
1105
1106 mutex_lock(&local->sta_mtx);
1107
1108 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1109 unsigned long last_active = ieee80211_sta_last_active(sta);
1110
1111 if (sdata != sta->sdata)
1112 continue;
1113
1114 if (time_is_before_jiffies(last_active + exp_time)) {
1115 sta_dbg(sta->sdata, "expiring inactive STA %pM\n",
1116 sta->sta.addr);
1117
1118 if (ieee80211_vif_is_mesh(&sdata->vif) &&
1119 test_sta_flag(sta, WLAN_STA_PS_STA))
1120 atomic_dec(&sdata->u.mesh.ps.num_sta_ps);
1121
1122 WARN_ON(__sta_info_destroy(sta));
1123 }
1124 }
1125
1126 mutex_unlock(&local->sta_mtx);
1127 }
1128
1129 struct ieee80211_sta *ieee80211_find_sta_by_ifaddr(struct ieee80211_hw *hw,
1130 const u8 *addr,
1131 const u8 *localaddr)
1132 {
1133 struct ieee80211_local *local = hw_to_local(hw);
1134 struct rhlist_head *tmp;
1135 struct sta_info *sta;
1136
1137 /*
1138 * Just return a random station if localaddr is NULL
1139 * ... first in list.
1140 */
1141 for_each_sta_info(local, addr, sta, tmp) {
1142 if (localaddr &&
1143 !ether_addr_equal(sta->sdata->vif.addr, localaddr))
1144 continue;
1145 if (!sta->uploaded)
1146 return NULL;
1147 return &sta->sta;
1148 }
1149
1150 return NULL;
1151 }
1152 EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr);
1153
1154 struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif,
1155 const u8 *addr)
1156 {
1157 struct sta_info *sta;
1158
1159 if (!vif)
1160 return NULL;
1161
1162 sta = sta_info_get_bss(vif_to_sdata(vif), addr);
1163 if (!sta)
1164 return NULL;
1165
1166 if (!sta->uploaded)
1167 return NULL;
1168
1169 return &sta->sta;
1170 }
1171 EXPORT_SYMBOL(ieee80211_find_sta);
1172
1173 /* powersave support code */
1174 void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta)
1175 {
1176 struct ieee80211_sub_if_data *sdata = sta->sdata;
1177 struct ieee80211_local *local = sdata->local;
1178 struct sk_buff_head pending;
1179 int filtered = 0, buffered = 0, ac, i;
1180 unsigned long flags;
1181 struct ps_data *ps;
1182
1183 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1184 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
1185 u.ap);
1186
1187 if (sdata->vif.type == NL80211_IFTYPE_AP)
1188 ps = &sdata->bss->ps;
1189 else if (ieee80211_vif_is_mesh(&sdata->vif))
1190 ps = &sdata->u.mesh.ps;
1191 else
1192 return;
1193
1194 clear_sta_flag(sta, WLAN_STA_SP);
1195
1196 BUILD_BUG_ON(BITS_TO_LONGS(IEEE80211_NUM_TIDS) > 1);
1197 sta->driver_buffered_tids = 0;
1198 sta->txq_buffered_tids = 0;
1199
1200 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
1201 drv_sta_notify(local, sdata, STA_NOTIFY_AWAKE, &sta->sta);
1202
1203 if (sta->sta.txq[0]) {
1204 for (i = 0; i < ARRAY_SIZE(sta->sta.txq); i++) {
1205 if (!txq_has_queue(sta->sta.txq[i]))
1206 continue;
1207
1208 drv_wake_tx_queue(local, to_txq_info(sta->sta.txq[i]));
1209 }
1210 }
1211
1212 skb_queue_head_init(&pending);
1213
1214 /* sync with ieee80211_tx_h_unicast_ps_buf */
1215 spin_lock(&sta->ps_lock);
1216 /* Send all buffered frames to the station */
1217 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1218 int count = skb_queue_len(&pending), tmp;
1219
1220 spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
1221 skb_queue_splice_tail_init(&sta->tx_filtered[ac], &pending);
1222 spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
1223 tmp = skb_queue_len(&pending);
1224 filtered += tmp - count;
1225 count = tmp;
1226
1227 spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
1228 skb_queue_splice_tail_init(&sta->ps_tx_buf[ac], &pending);
1229 spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
1230 tmp = skb_queue_len(&pending);
1231 buffered += tmp - count;
1232 }
1233
1234 ieee80211_add_pending_skbs(local, &pending);
1235
1236 /* now we're no longer in the deliver code */
1237 clear_sta_flag(sta, WLAN_STA_PS_DELIVER);
1238
1239 /* The station might have polled and then woken up before we responded,
1240 * so clear these flags now to avoid them sticking around.
1241 */
1242 clear_sta_flag(sta, WLAN_STA_PSPOLL);
1243 clear_sta_flag(sta, WLAN_STA_UAPSD);
1244 spin_unlock(&sta->ps_lock);
1245
1246 atomic_dec(&ps->num_sta_ps);
1247
1248 /* This station just woke up and isn't aware of our SMPS state */
1249 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
1250 !ieee80211_smps_is_restrictive(sta->known_smps_mode,
1251 sdata->smps_mode) &&
1252 sta->known_smps_mode != sdata->bss->req_smps &&
1253 sta_info_tx_streams(sta) != 1) {
1254 ht_dbg(sdata,
1255 "%pM just woke up and MIMO capable - update SMPS\n",
1256 sta->sta.addr);
1257 ieee80211_send_smps_action(sdata, sdata->bss->req_smps,
1258 sta->sta.addr,
1259 sdata->vif.bss_conf.bssid);
1260 }
1261
1262 local->total_ps_buffered -= buffered;
1263
1264 sta_info_recalc_tim(sta);
1265
1266 ps_dbg(sdata,
1267 "STA %pM aid %d sending %d filtered/%d PS frames since STA not sleeping anymore\n",
1268 sta->sta.addr, sta->sta.aid, filtered, buffered);
1269
1270 ieee80211_check_fast_xmit(sta);
1271 }
1272
1273 static void ieee80211_send_null_response(struct sta_info *sta, int tid,
1274 enum ieee80211_frame_release_type reason,
1275 bool call_driver, bool more_data)
1276 {
1277 struct ieee80211_sub_if_data *sdata = sta->sdata;
1278 struct ieee80211_local *local = sdata->local;
1279 struct ieee80211_qos_hdr *nullfunc;
1280 struct sk_buff *skb;
1281 int size = sizeof(*nullfunc);
1282 __le16 fc;
1283 bool qos = sta->sta.wme;
1284 struct ieee80211_tx_info *info;
1285 struct ieee80211_chanctx_conf *chanctx_conf;
1286
1287 if (qos) {
1288 fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1289 IEEE80211_STYPE_QOS_NULLFUNC |
1290 IEEE80211_FCTL_FROMDS);
1291 } else {
1292 size -= 2;
1293 fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1294 IEEE80211_STYPE_NULLFUNC |
1295 IEEE80211_FCTL_FROMDS);
1296 }
1297
1298 skb = dev_alloc_skb(local->hw.extra_tx_headroom + size);
1299 if (!skb)
1300 return;
1301
1302 skb_reserve(skb, local->hw.extra_tx_headroom);
1303
1304 nullfunc = (void *) skb_put(skb, size);
1305 nullfunc->frame_control = fc;
1306 nullfunc->duration_id = 0;
1307 memcpy(nullfunc->addr1, sta->sta.addr, ETH_ALEN);
1308 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
1309 memcpy(nullfunc->addr3, sdata->vif.addr, ETH_ALEN);
1310 nullfunc->seq_ctrl = 0;
1311
1312 skb->priority = tid;
1313 skb_set_queue_mapping(skb, ieee802_1d_to_ac[tid]);
1314 if (qos) {
1315 nullfunc->qos_ctrl = cpu_to_le16(tid);
1316
1317 if (reason == IEEE80211_FRAME_RELEASE_UAPSD) {
1318 nullfunc->qos_ctrl |=
1319 cpu_to_le16(IEEE80211_QOS_CTL_EOSP);
1320 if (more_data)
1321 nullfunc->frame_control |=
1322 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1323 }
1324 }
1325
1326 info = IEEE80211_SKB_CB(skb);
1327
1328 /*
1329 * Tell TX path to send this frame even though the
1330 * STA may still remain is PS mode after this frame
1331 * exchange. Also set EOSP to indicate this packet
1332 * ends the poll/service period.
1333 */
1334 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER |
1335 IEEE80211_TX_STATUS_EOSP |
1336 IEEE80211_TX_CTL_REQ_TX_STATUS;
1337
1338 info->control.flags |= IEEE80211_TX_CTRL_PS_RESPONSE;
1339
1340 if (call_driver)
1341 drv_allow_buffered_frames(local, sta, BIT(tid), 1,
1342 reason, false);
1343
1344 skb->dev = sdata->dev;
1345
1346 rcu_read_lock();
1347 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1348 if (WARN_ON(!chanctx_conf)) {
1349 rcu_read_unlock();
1350 kfree_skb(skb);
1351 return;
1352 }
1353
1354 info->band = chanctx_conf->def.chan->band;
1355 ieee80211_xmit(sdata, sta, skb);
1356 rcu_read_unlock();
1357 }
1358
1359 static int find_highest_prio_tid(unsigned long tids)
1360 {
1361 /* lower 3 TIDs aren't ordered perfectly */
1362 if (tids & 0xF8)
1363 return fls(tids) - 1;
1364 /* TID 0 is BE just like TID 3 */
1365 if (tids & BIT(0))
1366 return 0;
1367 return fls(tids) - 1;
1368 }
1369
1370 /* Indicates if the MORE_DATA bit should be set in the last
1371 * frame obtained by ieee80211_sta_ps_get_frames.
1372 * Note that driver_release_tids is relevant only if
1373 * reason = IEEE80211_FRAME_RELEASE_PSPOLL
1374 */
1375 static bool
1376 ieee80211_sta_ps_more_data(struct sta_info *sta, u8 ignored_acs,
1377 enum ieee80211_frame_release_type reason,
1378 unsigned long driver_release_tids)
1379 {
1380 int ac;
1381
1382 /* If the driver has data on more than one TID then
1383 * certainly there's more data if we release just a
1384 * single frame now (from a single TID). This will
1385 * only happen for PS-Poll.
1386 */
1387 if (reason == IEEE80211_FRAME_RELEASE_PSPOLL &&
1388 hweight16(driver_release_tids) > 1)
1389 return true;
1390
1391 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1392 if (ignored_acs & ieee80211_ac_to_qos_mask[ac])
1393 continue;
1394
1395 if (!skb_queue_empty(&sta->tx_filtered[ac]) ||
1396 !skb_queue_empty(&sta->ps_tx_buf[ac]))
1397 return true;
1398 }
1399
1400 return false;
1401 }
1402
1403 static void
1404 ieee80211_sta_ps_get_frames(struct sta_info *sta, int n_frames, u8 ignored_acs,
1405 enum ieee80211_frame_release_type reason,
1406 struct sk_buff_head *frames,
1407 unsigned long *driver_release_tids)
1408 {
1409 struct ieee80211_sub_if_data *sdata = sta->sdata;
1410 struct ieee80211_local *local = sdata->local;
1411 int ac;
1412
1413 /* Get response frame(s) and more data bit for the last one. */
1414 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1415 unsigned long tids;
1416
1417 if (ignored_acs & ieee80211_ac_to_qos_mask[ac])
1418 continue;
1419
1420 tids = ieee80211_tids_for_ac(ac);
1421
1422 /* if we already have frames from software, then we can't also
1423 * release from hardware queues
1424 */
1425 if (skb_queue_empty(frames)) {
1426 *driver_release_tids |=
1427 sta->driver_buffered_tids & tids;
1428 *driver_release_tids |= sta->txq_buffered_tids & tids;
1429 }
1430
1431 if (!*driver_release_tids) {
1432 struct sk_buff *skb;
1433
1434 while (n_frames > 0) {
1435 skb = skb_dequeue(&sta->tx_filtered[ac]);
1436 if (!skb) {
1437 skb = skb_dequeue(
1438 &sta->ps_tx_buf[ac]);
1439 if (skb)
1440 local->total_ps_buffered--;
1441 }
1442 if (!skb)
1443 break;
1444 n_frames--;
1445 __skb_queue_tail(frames, skb);
1446 }
1447 }
1448
1449 /* If we have more frames buffered on this AC, then abort the
1450 * loop since we can't send more data from other ACs before
1451 * the buffered frames from this.
1452 */
1453 if (!skb_queue_empty(&sta->tx_filtered[ac]) ||
1454 !skb_queue_empty(&sta->ps_tx_buf[ac]))
1455 break;
1456 }
1457 }
1458
1459 static void
1460 ieee80211_sta_ps_deliver_response(struct sta_info *sta,
1461 int n_frames, u8 ignored_acs,
1462 enum ieee80211_frame_release_type reason)
1463 {
1464 struct ieee80211_sub_if_data *sdata = sta->sdata;
1465 struct ieee80211_local *local = sdata->local;
1466 unsigned long driver_release_tids = 0;
1467 struct sk_buff_head frames;
1468 bool more_data;
1469
1470 /* Service or PS-Poll period starts */
1471 set_sta_flag(sta, WLAN_STA_SP);
1472
1473 __skb_queue_head_init(&frames);
1474
1475 ieee80211_sta_ps_get_frames(sta, n_frames, ignored_acs, reason,
1476 &frames, &driver_release_tids);
1477
1478 more_data = ieee80211_sta_ps_more_data(sta, ignored_acs, reason, driver_release_tids);
1479
1480 if (driver_release_tids && reason == IEEE80211_FRAME_RELEASE_PSPOLL)
1481 driver_release_tids =
1482 BIT(find_highest_prio_tid(driver_release_tids));
1483
1484 if (skb_queue_empty(&frames) && !driver_release_tids) {
1485 int tid, ac;
1486
1487 /*
1488 * For PS-Poll, this can only happen due to a race condition
1489 * when we set the TIM bit and the station notices it, but
1490 * before it can poll for the frame we expire it.
1491 *
1492 * For uAPSD, this is said in the standard (11.2.1.5 h):
1493 * At each unscheduled SP for a non-AP STA, the AP shall
1494 * attempt to transmit at least one MSDU or MMPDU, but no
1495 * more than the value specified in the Max SP Length field
1496 * in the QoS Capability element from delivery-enabled ACs,
1497 * that are destined for the non-AP STA.
1498 *
1499 * Since we have no other MSDU/MMPDU, transmit a QoS null frame.
1500 */
1501
1502 /* This will evaluate to 1, 3, 5 or 7. */
1503 for (ac = IEEE80211_AC_VO; ac < IEEE80211_NUM_ACS; ac++)
1504 if (ignored_acs & BIT(ac))
1505 continue;
1506 tid = 7 - 2 * ac;
1507
1508 ieee80211_send_null_response(sta, tid, reason, true, false);
1509 } else if (!driver_release_tids) {
1510 struct sk_buff_head pending;
1511 struct sk_buff *skb;
1512 int num = 0;
1513 u16 tids = 0;
1514 bool need_null = false;
1515
1516 skb_queue_head_init(&pending);
1517
1518 while ((skb = __skb_dequeue(&frames))) {
1519 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1520 struct ieee80211_hdr *hdr = (void *) skb->data;
1521 u8 *qoshdr = NULL;
1522
1523 num++;
1524
1525 /*
1526 * Tell TX path to send this frame even though the
1527 * STA may still remain is PS mode after this frame
1528 * exchange.
1529 */
1530 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
1531 info->control.flags |= IEEE80211_TX_CTRL_PS_RESPONSE;
1532
1533 /*
1534 * Use MoreData flag to indicate whether there are
1535 * more buffered frames for this STA
1536 */
1537 if (more_data || !skb_queue_empty(&frames))
1538 hdr->frame_control |=
1539 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1540 else
1541 hdr->frame_control &=
1542 cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
1543
1544 if (ieee80211_is_data_qos(hdr->frame_control) ||
1545 ieee80211_is_qos_nullfunc(hdr->frame_control))
1546 qoshdr = ieee80211_get_qos_ctl(hdr);
1547
1548 tids |= BIT(skb->priority);
1549
1550 __skb_queue_tail(&pending, skb);
1551
1552 /* end service period after last frame or add one */
1553 if (!skb_queue_empty(&frames))
1554 continue;
1555
1556 if (reason != IEEE80211_FRAME_RELEASE_UAPSD) {
1557 /* for PS-Poll, there's only one frame */
1558 info->flags |= IEEE80211_TX_STATUS_EOSP |
1559 IEEE80211_TX_CTL_REQ_TX_STATUS;
1560 break;
1561 }
1562
1563 /* For uAPSD, things are a bit more complicated. If the
1564 * last frame has a QoS header (i.e. is a QoS-data or
1565 * QoS-nulldata frame) then just set the EOSP bit there
1566 * and be done.
1567 * If the frame doesn't have a QoS header (which means
1568 * it should be a bufferable MMPDU) then we can't set
1569 * the EOSP bit in the QoS header; add a QoS-nulldata
1570 * frame to the list to send it after the MMPDU.
1571 *
1572 * Note that this code is only in the mac80211-release
1573 * code path, we assume that the driver will not buffer
1574 * anything but QoS-data frames, or if it does, will
1575 * create the QoS-nulldata frame by itself if needed.
1576 *
1577 * Cf. 802.11-2012 10.2.1.10 (c).
1578 */
1579 if (qoshdr) {
1580 *qoshdr |= IEEE80211_QOS_CTL_EOSP;
1581
1582 info->flags |= IEEE80211_TX_STATUS_EOSP |
1583 IEEE80211_TX_CTL_REQ_TX_STATUS;
1584 } else {
1585 /* The standard isn't completely clear on this
1586 * as it says the more-data bit should be set
1587 * if there are more BUs. The QoS-Null frame
1588 * we're about to send isn't buffered yet, we
1589 * only create it below, but let's pretend it
1590 * was buffered just in case some clients only
1591 * expect more-data=0 when eosp=1.
1592 */
1593 hdr->frame_control |=
1594 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1595 need_null = true;
1596 num++;
1597 }
1598 break;
1599 }
1600
1601 drv_allow_buffered_frames(local, sta, tids, num,
1602 reason, more_data);
1603
1604 ieee80211_add_pending_skbs(local, &pending);
1605
1606 if (need_null)
1607 ieee80211_send_null_response(
1608 sta, find_highest_prio_tid(tids),
1609 reason, false, false);
1610
1611 sta_info_recalc_tim(sta);
1612 } else {
1613 int tid;
1614
1615 /*
1616 * We need to release a frame that is buffered somewhere in the
1617 * driver ... it'll have to handle that.
1618 * Note that the driver also has to check the number of frames
1619 * on the TIDs we're releasing from - if there are more than
1620 * n_frames it has to set the more-data bit (if we didn't ask
1621 * it to set it anyway due to other buffered frames); if there
1622 * are fewer than n_frames it has to make sure to adjust that
1623 * to allow the service period to end properly.
1624 */
1625 drv_release_buffered_frames(local, sta, driver_release_tids,
1626 n_frames, reason, more_data);
1627
1628 /*
1629 * Note that we don't recalculate the TIM bit here as it would
1630 * most likely have no effect at all unless the driver told us
1631 * that the TID(s) became empty before returning here from the
1632 * release function.
1633 * Either way, however, when the driver tells us that the TID(s)
1634 * became empty or we find that a txq became empty, we'll do the
1635 * TIM recalculation.
1636 */
1637
1638 if (!sta->sta.txq[0])
1639 return;
1640
1641 for (tid = 0; tid < ARRAY_SIZE(sta->sta.txq); tid++) {
1642 if (!(driver_release_tids & BIT(tid)) ||
1643 txq_has_queue(sta->sta.txq[tid]))
1644 continue;
1645
1646 sta_info_recalc_tim(sta);
1647 break;
1648 }
1649 }
1650 }
1651
1652 void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta)
1653 {
1654 u8 ignore_for_response = sta->sta.uapsd_queues;
1655
1656 /*
1657 * If all ACs are delivery-enabled then we should reply
1658 * from any of them, if only some are enabled we reply
1659 * only from the non-enabled ones.
1660 */
1661 if (ignore_for_response == BIT(IEEE80211_NUM_ACS) - 1)
1662 ignore_for_response = 0;
1663
1664 ieee80211_sta_ps_deliver_response(sta, 1, ignore_for_response,
1665 IEEE80211_FRAME_RELEASE_PSPOLL);
1666 }
1667
1668 void ieee80211_sta_ps_deliver_uapsd(struct sta_info *sta)
1669 {
1670 int n_frames = sta->sta.max_sp;
1671 u8 delivery_enabled = sta->sta.uapsd_queues;
1672
1673 /*
1674 * If we ever grow support for TSPEC this might happen if
1675 * the TSPEC update from hostapd comes in between a trigger
1676 * frame setting WLAN_STA_UAPSD in the RX path and this
1677 * actually getting called.
1678 */
1679 if (!delivery_enabled)
1680 return;
1681
1682 switch (sta->sta.max_sp) {
1683 case 1:
1684 n_frames = 2;
1685 break;
1686 case 2:
1687 n_frames = 4;
1688 break;
1689 case 3:
1690 n_frames = 6;
1691 break;
1692 case 0:
1693 /* XXX: what is a good value? */
1694 n_frames = 128;
1695 break;
1696 }
1697
1698 ieee80211_sta_ps_deliver_response(sta, n_frames, ~delivery_enabled,
1699 IEEE80211_FRAME_RELEASE_UAPSD);
1700 }
1701
1702 void ieee80211_sta_block_awake(struct ieee80211_hw *hw,
1703 struct ieee80211_sta *pubsta, bool block)
1704 {
1705 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1706
1707 trace_api_sta_block_awake(sta->local, pubsta, block);
1708
1709 if (block) {
1710 set_sta_flag(sta, WLAN_STA_PS_DRIVER);
1711 ieee80211_clear_fast_xmit(sta);
1712 return;
1713 }
1714
1715 if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1716 return;
1717
1718 if (!test_sta_flag(sta, WLAN_STA_PS_STA)) {
1719 set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1720 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
1721 ieee80211_queue_work(hw, &sta->drv_deliver_wk);
1722 } else if (test_sta_flag(sta, WLAN_STA_PSPOLL) ||
1723 test_sta_flag(sta, WLAN_STA_UAPSD)) {
1724 /* must be asleep in this case */
1725 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
1726 ieee80211_queue_work(hw, &sta->drv_deliver_wk);
1727 } else {
1728 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
1729 ieee80211_check_fast_xmit(sta);
1730 }
1731 }
1732 EXPORT_SYMBOL(ieee80211_sta_block_awake);
1733
1734 void ieee80211_sta_eosp(struct ieee80211_sta *pubsta)
1735 {
1736 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1737 struct ieee80211_local *local = sta->local;
1738
1739 trace_api_eosp(local, pubsta);
1740
1741 clear_sta_flag(sta, WLAN_STA_SP);
1742 }
1743 EXPORT_SYMBOL(ieee80211_sta_eosp);
1744
1745 void ieee80211_send_eosp_nullfunc(struct ieee80211_sta *pubsta, int tid)
1746 {
1747 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1748 enum ieee80211_frame_release_type reason;
1749 bool more_data;
1750
1751 trace_api_send_eosp_nullfunc(sta->local, pubsta, tid);
1752
1753 reason = IEEE80211_FRAME_RELEASE_UAPSD;
1754 more_data = ieee80211_sta_ps_more_data(sta, ~sta->sta.uapsd_queues,
1755 reason, 0);
1756
1757 ieee80211_send_null_response(sta, tid, reason, false, more_data);
1758 }
1759 EXPORT_SYMBOL(ieee80211_send_eosp_nullfunc);
1760
1761 void ieee80211_sta_set_buffered(struct ieee80211_sta *pubsta,
1762 u8 tid, bool buffered)
1763 {
1764 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1765
1766 if (WARN_ON(tid >= IEEE80211_NUM_TIDS))
1767 return;
1768
1769 trace_api_sta_set_buffered(sta->local, pubsta, tid, buffered);
1770
1771 if (buffered)
1772 set_bit(tid, &sta->driver_buffered_tids);
1773 else
1774 clear_bit(tid, &sta->driver_buffered_tids);
1775
1776 sta_info_recalc_tim(sta);
1777 }
1778 EXPORT_SYMBOL(ieee80211_sta_set_buffered);
1779
1780 static void
1781 ieee80211_recalc_p2p_go_ps_allowed(struct ieee80211_sub_if_data *sdata)
1782 {
1783 struct ieee80211_local *local = sdata->local;
1784 bool allow_p2p_go_ps = sdata->vif.p2p;
1785 struct sta_info *sta;
1786
1787 rcu_read_lock();
1788 list_for_each_entry_rcu(sta, &local->sta_list, list) {
1789 if (sdata != sta->sdata ||
1790 !test_sta_flag(sta, WLAN_STA_ASSOC))
1791 continue;
1792 if (!sta->sta.support_p2p_ps) {
1793 allow_p2p_go_ps = false;
1794 break;
1795 }
1796 }
1797 rcu_read_unlock();
1798
1799 if (allow_p2p_go_ps != sdata->vif.bss_conf.allow_p2p_go_ps) {
1800 sdata->vif.bss_conf.allow_p2p_go_ps = allow_p2p_go_ps;
1801 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_P2P_PS);
1802 }
1803 }
1804
1805 int sta_info_move_state(struct sta_info *sta,
1806 enum ieee80211_sta_state new_state)
1807 {
1808 might_sleep();
1809
1810 if (sta->sta_state == new_state)
1811 return 0;
1812
1813 /* check allowed transitions first */
1814
1815 switch (new_state) {
1816 case IEEE80211_STA_NONE:
1817 if (sta->sta_state != IEEE80211_STA_AUTH)
1818 return -EINVAL;
1819 break;
1820 case IEEE80211_STA_AUTH:
1821 if (sta->sta_state != IEEE80211_STA_NONE &&
1822 sta->sta_state != IEEE80211_STA_ASSOC)
1823 return -EINVAL;
1824 break;
1825 case IEEE80211_STA_ASSOC:
1826 if (sta->sta_state != IEEE80211_STA_AUTH &&
1827 sta->sta_state != IEEE80211_STA_AUTHORIZED)
1828 return -EINVAL;
1829 break;
1830 case IEEE80211_STA_AUTHORIZED:
1831 if (sta->sta_state != IEEE80211_STA_ASSOC)
1832 return -EINVAL;
1833 break;
1834 default:
1835 WARN(1, "invalid state %d", new_state);
1836 return -EINVAL;
1837 }
1838
1839 sta_dbg(sta->sdata, "moving STA %pM to state %d\n",
1840 sta->sta.addr, new_state);
1841
1842 /*
1843 * notify the driver before the actual changes so it can
1844 * fail the transition
1845 */
1846 if (test_sta_flag(sta, WLAN_STA_INSERTED)) {
1847 int err = drv_sta_state(sta->local, sta->sdata, sta,
1848 sta->sta_state, new_state);
1849 if (err)
1850 return err;
1851 }
1852
1853 /* reflect the change in all state variables */
1854
1855 switch (new_state) {
1856 case IEEE80211_STA_NONE:
1857 if (sta->sta_state == IEEE80211_STA_AUTH)
1858 clear_bit(WLAN_STA_AUTH, &sta->_flags);
1859 break;
1860 case IEEE80211_STA_AUTH:
1861 if (sta->sta_state == IEEE80211_STA_NONE) {
1862 set_bit(WLAN_STA_AUTH, &sta->_flags);
1863 } else if (sta->sta_state == IEEE80211_STA_ASSOC) {
1864 clear_bit(WLAN_STA_ASSOC, &sta->_flags);
1865 ieee80211_recalc_min_chandef(sta->sdata);
1866 if (!sta->sta.support_p2p_ps)
1867 ieee80211_recalc_p2p_go_ps_allowed(sta->sdata);
1868 }
1869 break;
1870 case IEEE80211_STA_ASSOC:
1871 if (sta->sta_state == IEEE80211_STA_AUTH) {
1872 set_bit(WLAN_STA_ASSOC, &sta->_flags);
1873 ieee80211_recalc_min_chandef(sta->sdata);
1874 if (!sta->sta.support_p2p_ps)
1875 ieee80211_recalc_p2p_go_ps_allowed(sta->sdata);
1876 } else if (sta->sta_state == IEEE80211_STA_AUTHORIZED) {
1877 ieee80211_vif_dec_num_mcast(sta->sdata);
1878 clear_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
1879 ieee80211_clear_fast_xmit(sta);
1880 ieee80211_clear_fast_rx(sta);
1881 }
1882 break;
1883 case IEEE80211_STA_AUTHORIZED:
1884 if (sta->sta_state == IEEE80211_STA_ASSOC) {
1885 ieee80211_vif_inc_num_mcast(sta->sdata);
1886 set_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
1887 ieee80211_check_fast_xmit(sta);
1888 ieee80211_check_fast_rx(sta);
1889 }
1890 break;
1891 default:
1892 break;
1893 }
1894
1895 sta->sta_state = new_state;
1896
1897 return 0;
1898 }
1899
1900 u8 sta_info_tx_streams(struct sta_info *sta)
1901 {
1902 struct ieee80211_sta_ht_cap *ht_cap = &sta->sta.ht_cap;
1903 u8 rx_streams;
1904
1905 if (!sta->sta.ht_cap.ht_supported)
1906 return 1;
1907
1908 if (sta->sta.vht_cap.vht_supported) {
1909 int i;
1910 u16 tx_mcs_map =
1911 le16_to_cpu(sta->sta.vht_cap.vht_mcs.tx_mcs_map);
1912
1913 for (i = 7; i >= 0; i--)
1914 if ((tx_mcs_map & (0x3 << (i * 2))) !=
1915 IEEE80211_VHT_MCS_NOT_SUPPORTED)
1916 return i + 1;
1917 }
1918
1919 if (ht_cap->mcs.rx_mask[3])
1920 rx_streams = 4;
1921 else if (ht_cap->mcs.rx_mask[2])
1922 rx_streams = 3;
1923 else if (ht_cap->mcs.rx_mask[1])
1924 rx_streams = 2;
1925 else
1926 rx_streams = 1;
1927
1928 if (!(ht_cap->mcs.tx_params & IEEE80211_HT_MCS_TX_RX_DIFF))
1929 return rx_streams;
1930
1931 return ((ht_cap->mcs.tx_params & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
1932 >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1;
1933 }
1934
1935 static struct ieee80211_sta_rx_stats *
1936 sta_get_last_rx_stats(struct sta_info *sta)
1937 {
1938 struct ieee80211_sta_rx_stats *stats = &sta->rx_stats;
1939 struct ieee80211_local *local = sta->local;
1940 int cpu;
1941
1942 if (!ieee80211_hw_check(&local->hw, USES_RSS))
1943 return stats;
1944
1945 for_each_possible_cpu(cpu) {
1946 struct ieee80211_sta_rx_stats *cpustats;
1947
1948 cpustats = per_cpu_ptr(sta->pcpu_rx_stats, cpu);
1949
1950 if (time_after(cpustats->last_rx, stats->last_rx))
1951 stats = cpustats;
1952 }
1953
1954 return stats;
1955 }
1956
1957 static void sta_stats_decode_rate(struct ieee80211_local *local, u16 rate,
1958 struct rate_info *rinfo)
1959 {
1960 rinfo->bw = (rate & STA_STATS_RATE_BW_MASK) >>
1961 STA_STATS_RATE_BW_SHIFT;
1962
1963 if (rate & STA_STATS_RATE_VHT) {
1964 rinfo->flags = RATE_INFO_FLAGS_VHT_MCS;
1965 rinfo->mcs = rate & 0xf;
1966 rinfo->nss = (rate & 0xf0) >> 4;
1967 } else if (rate & STA_STATS_RATE_HT) {
1968 rinfo->flags = RATE_INFO_FLAGS_MCS;
1969 rinfo->mcs = rate & 0xff;
1970 } else if (rate & STA_STATS_RATE_LEGACY) {
1971 struct ieee80211_supported_band *sband;
1972 u16 brate;
1973 unsigned int shift;
1974
1975 rinfo->flags = 0;
1976 sband = local->hw.wiphy->bands[(rate >> 4) & 0xf];
1977 brate = sband->bitrates[rate & 0xf].bitrate;
1978 if (rinfo->bw == RATE_INFO_BW_5)
1979 shift = 2;
1980 else if (rinfo->bw == RATE_INFO_BW_10)
1981 shift = 1;
1982 else
1983 shift = 0;
1984 rinfo->legacy = DIV_ROUND_UP(brate, 1 << shift);
1985 }
1986
1987 if (rate & STA_STATS_RATE_SGI)
1988 rinfo->flags |= RATE_INFO_FLAGS_SHORT_GI;
1989 }
1990
1991 static int sta_set_rate_info_rx(struct sta_info *sta, struct rate_info *rinfo)
1992 {
1993 u16 rate = ACCESS_ONCE(sta_get_last_rx_stats(sta)->last_rate);
1994
1995 if (rate == STA_STATS_RATE_INVALID)
1996 return -EINVAL;
1997
1998 sta_stats_decode_rate(sta->local, rate, rinfo);
1999 return 0;
2000 }
2001
2002 static void sta_set_tidstats(struct sta_info *sta,
2003 struct cfg80211_tid_stats *tidstats,
2004 int tid)
2005 {
2006 struct ieee80211_local *local = sta->local;
2007
2008 if (!(tidstats->filled & BIT(NL80211_TID_STATS_RX_MSDU))) {
2009 unsigned int start;
2010
2011 do {
2012 start = u64_stats_fetch_begin(&sta->rx_stats.syncp);
2013 tidstats->rx_msdu = sta->rx_stats.msdu[tid];
2014 } while (u64_stats_fetch_retry(&sta->rx_stats.syncp, start));
2015
2016 tidstats->filled |= BIT(NL80211_TID_STATS_RX_MSDU);
2017 }
2018
2019 if (!(tidstats->filled & BIT(NL80211_TID_STATS_TX_MSDU))) {
2020 tidstats->filled |= BIT(NL80211_TID_STATS_TX_MSDU);
2021 tidstats->tx_msdu = sta->tx_stats.msdu[tid];
2022 }
2023
2024 if (!(tidstats->filled & BIT(NL80211_TID_STATS_TX_MSDU_RETRIES)) &&
2025 ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
2026 tidstats->filled |= BIT(NL80211_TID_STATS_TX_MSDU_RETRIES);
2027 tidstats->tx_msdu_retries = sta->status_stats.msdu_retries[tid];
2028 }
2029
2030 if (!(tidstats->filled & BIT(NL80211_TID_STATS_TX_MSDU_FAILED)) &&
2031 ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
2032 tidstats->filled |= BIT(NL80211_TID_STATS_TX_MSDU_FAILED);
2033 tidstats->tx_msdu_failed = sta->status_stats.msdu_failed[tid];
2034 }
2035 }
2036
2037 static inline u64 sta_get_stats_bytes(struct ieee80211_sta_rx_stats *rxstats)
2038 {
2039 unsigned int start;
2040 u64 value;
2041
2042 do {
2043 start = u64_stats_fetch_begin(&rxstats->syncp);
2044 value = rxstats->bytes;
2045 } while (u64_stats_fetch_retry(&rxstats->syncp, start));
2046
2047 return value;
2048 }
2049
2050 void sta_set_sinfo(struct sta_info *sta, struct station_info *sinfo)
2051 {
2052 struct ieee80211_sub_if_data *sdata = sta->sdata;
2053 struct ieee80211_local *local = sdata->local;
2054 struct rate_control_ref *ref = NULL;
2055 u32 thr = 0;
2056 int i, ac, cpu;
2057 struct ieee80211_sta_rx_stats *last_rxstats;
2058
2059 last_rxstats = sta_get_last_rx_stats(sta);
2060
2061 if (test_sta_flag(sta, WLAN_STA_RATE_CONTROL))
2062 ref = local->rate_ctrl;
2063
2064 sinfo->generation = sdata->local->sta_generation;
2065
2066 /* do before driver, so beacon filtering drivers have a
2067 * chance to e.g. just add the number of filtered beacons
2068 * (or just modify the value entirely, of course)
2069 */
2070 if (sdata->vif.type == NL80211_IFTYPE_STATION)
2071 sinfo->rx_beacon = sdata->u.mgd.count_beacon_signal;
2072
2073 drv_sta_statistics(local, sdata, &sta->sta, sinfo);
2074
2075 sinfo->filled |= BIT(NL80211_STA_INFO_INACTIVE_TIME) |
2076 BIT(NL80211_STA_INFO_STA_FLAGS) |
2077 BIT(NL80211_STA_INFO_BSS_PARAM) |
2078 BIT(NL80211_STA_INFO_CONNECTED_TIME) |
2079 BIT(NL80211_STA_INFO_RX_DROP_MISC);
2080
2081 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2082 sinfo->beacon_loss_count = sdata->u.mgd.beacon_loss_count;
2083 sinfo->filled |= BIT(NL80211_STA_INFO_BEACON_LOSS);
2084 }
2085
2086 sinfo->connected_time = ktime_get_seconds() - sta->last_connected;
2087 sinfo->inactive_time =
2088 jiffies_to_msecs(jiffies - ieee80211_sta_last_active(sta));
2089
2090 if (!(sinfo->filled & (BIT(NL80211_STA_INFO_TX_BYTES64) |
2091 BIT(NL80211_STA_INFO_TX_BYTES)))) {
2092 sinfo->tx_bytes = 0;
2093 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
2094 sinfo->tx_bytes += sta->tx_stats.bytes[ac];
2095 sinfo->filled |= BIT(NL80211_STA_INFO_TX_BYTES64);
2096 }
2097
2098 if (!(sinfo->filled & BIT(NL80211_STA_INFO_TX_PACKETS))) {
2099 sinfo->tx_packets = 0;
2100 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
2101 sinfo->tx_packets += sta->tx_stats.packets[ac];
2102 sinfo->filled |= BIT(NL80211_STA_INFO_TX_PACKETS);
2103 }
2104
2105 if (!(sinfo->filled & (BIT(NL80211_STA_INFO_RX_BYTES64) |
2106 BIT(NL80211_STA_INFO_RX_BYTES)))) {
2107 sinfo->rx_bytes += sta_get_stats_bytes(&sta->rx_stats);
2108
2109 if (sta->pcpu_rx_stats) {
2110 for_each_possible_cpu(cpu) {
2111 struct ieee80211_sta_rx_stats *cpurxs;
2112
2113 cpurxs = per_cpu_ptr(sta->pcpu_rx_stats, cpu);
2114 sinfo->rx_bytes += sta_get_stats_bytes(cpurxs);
2115 }
2116 }
2117
2118 sinfo->filled |= BIT(NL80211_STA_INFO_RX_BYTES64);
2119 }
2120
2121 if (!(sinfo->filled & BIT(NL80211_STA_INFO_RX_PACKETS))) {
2122 sinfo->rx_packets = sta->rx_stats.packets;
2123 if (sta->pcpu_rx_stats) {
2124 for_each_possible_cpu(cpu) {
2125 struct ieee80211_sta_rx_stats *cpurxs;
2126
2127 cpurxs = per_cpu_ptr(sta->pcpu_rx_stats, cpu);
2128 sinfo->rx_packets += cpurxs->packets;
2129 }
2130 }
2131 sinfo->filled |= BIT(NL80211_STA_INFO_RX_PACKETS);
2132 }
2133
2134 if (!(sinfo->filled & BIT(NL80211_STA_INFO_TX_RETRIES))) {
2135 sinfo->tx_retries = sta->status_stats.retry_count;
2136 sinfo->filled |= BIT(NL80211_STA_INFO_TX_RETRIES);
2137 }
2138
2139 if (!(sinfo->filled & BIT(NL80211_STA_INFO_TX_FAILED))) {
2140 sinfo->tx_failed = sta->status_stats.retry_failed;
2141 sinfo->filled |= BIT(NL80211_STA_INFO_TX_FAILED);
2142 }
2143
2144 sinfo->rx_dropped_misc = sta->rx_stats.dropped;
2145 if (sta->pcpu_rx_stats) {
2146 for_each_possible_cpu(cpu) {
2147 struct ieee80211_sta_rx_stats *cpurxs;
2148
2149 cpurxs = per_cpu_ptr(sta->pcpu_rx_stats, cpu);
2150 sinfo->rx_packets += cpurxs->dropped;
2151 }
2152 }
2153
2154 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2155 !(sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)) {
2156 sinfo->filled |= BIT(NL80211_STA_INFO_BEACON_RX) |
2157 BIT(NL80211_STA_INFO_BEACON_SIGNAL_AVG);
2158 sinfo->rx_beacon_signal_avg = ieee80211_ave_rssi(&sdata->vif);
2159 }
2160
2161 if (ieee80211_hw_check(&sta->local->hw, SIGNAL_DBM) ||
2162 ieee80211_hw_check(&sta->local->hw, SIGNAL_UNSPEC)) {
2163 if (!(sinfo->filled & BIT(NL80211_STA_INFO_SIGNAL))) {
2164 sinfo->signal = (s8)last_rxstats->last_signal;
2165 sinfo->filled |= BIT(NL80211_STA_INFO_SIGNAL);
2166 }
2167
2168 if (!sta->pcpu_rx_stats &&
2169 !(sinfo->filled & BIT(NL80211_STA_INFO_SIGNAL_AVG))) {
2170 sinfo->signal_avg =
2171 -ewma_signal_read(&sta->rx_stats_avg.signal);
2172 sinfo->filled |= BIT(NL80211_STA_INFO_SIGNAL_AVG);
2173 }
2174 }
2175
2176 /* for the average - if pcpu_rx_stats isn't set - rxstats must point to
2177 * the sta->rx_stats struct, so the check here is fine with and without
2178 * pcpu statistics
2179 */
2180 if (last_rxstats->chains &&
2181 !(sinfo->filled & (BIT(NL80211_STA_INFO_CHAIN_SIGNAL) |
2182 BIT(NL80211_STA_INFO_CHAIN_SIGNAL_AVG)))) {
2183 sinfo->filled |= BIT(NL80211_STA_INFO_CHAIN_SIGNAL);
2184 if (!sta->pcpu_rx_stats)
2185 sinfo->filled |= BIT(NL80211_STA_INFO_CHAIN_SIGNAL_AVG);
2186
2187 sinfo->chains = last_rxstats->chains;
2188
2189 for (i = 0; i < ARRAY_SIZE(sinfo->chain_signal); i++) {
2190 sinfo->chain_signal[i] =
2191 last_rxstats->chain_signal_last[i];
2192 sinfo->chain_signal_avg[i] =
2193 -ewma_signal_read(&sta->rx_stats_avg.chain_signal[i]);
2194 }
2195 }
2196
2197 if (!(sinfo->filled & BIT(NL80211_STA_INFO_TX_BITRATE))) {
2198 sta_set_rate_info_tx(sta, &sta->tx_stats.last_rate,
2199 &sinfo->txrate);
2200 sinfo->filled |= BIT(NL80211_STA_INFO_TX_BITRATE);
2201 }
2202
2203 if (!(sinfo->filled & BIT(NL80211_STA_INFO_RX_BITRATE))) {
2204 if (sta_set_rate_info_rx(sta, &sinfo->rxrate) == 0)
2205 sinfo->filled |= BIT(NL80211_STA_INFO_RX_BITRATE);
2206 }
2207
2208 sinfo->filled |= BIT(NL80211_STA_INFO_TID_STATS);
2209 for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) {
2210 struct cfg80211_tid_stats *tidstats = &sinfo->pertid[i];
2211
2212 sta_set_tidstats(sta, tidstats, i);
2213 }
2214
2215 if (ieee80211_vif_is_mesh(&sdata->vif)) {
2216 #ifdef CONFIG_MAC80211_MESH
2217 sinfo->filled |= BIT(NL80211_STA_INFO_LLID) |
2218 BIT(NL80211_STA_INFO_PLID) |
2219 BIT(NL80211_STA_INFO_PLINK_STATE) |
2220 BIT(NL80211_STA_INFO_LOCAL_PM) |
2221 BIT(NL80211_STA_INFO_PEER_PM) |
2222 BIT(NL80211_STA_INFO_NONPEER_PM);
2223
2224 sinfo->llid = sta->mesh->llid;
2225 sinfo->plid = sta->mesh->plid;
2226 sinfo->plink_state = sta->mesh->plink_state;
2227 if (test_sta_flag(sta, WLAN_STA_TOFFSET_KNOWN)) {
2228 sinfo->filled |= BIT(NL80211_STA_INFO_T_OFFSET);
2229 sinfo->t_offset = sta->mesh->t_offset;
2230 }
2231 sinfo->local_pm = sta->mesh->local_pm;
2232 sinfo->peer_pm = sta->mesh->peer_pm;
2233 sinfo->nonpeer_pm = sta->mesh->nonpeer_pm;
2234 #endif
2235 }
2236
2237 sinfo->bss_param.flags = 0;
2238 if (sdata->vif.bss_conf.use_cts_prot)
2239 sinfo->bss_param.flags |= BSS_PARAM_FLAGS_CTS_PROT;
2240 if (sdata->vif.bss_conf.use_short_preamble)
2241 sinfo->bss_param.flags |= BSS_PARAM_FLAGS_SHORT_PREAMBLE;
2242 if (sdata->vif.bss_conf.use_short_slot)
2243 sinfo->bss_param.flags |= BSS_PARAM_FLAGS_SHORT_SLOT_TIME;
2244 sinfo->bss_param.dtim_period = sdata->vif.bss_conf.dtim_period;
2245 sinfo->bss_param.beacon_interval = sdata->vif.bss_conf.beacon_int;
2246
2247 sinfo->sta_flags.set = 0;
2248 sinfo->sta_flags.mask = BIT(NL80211_STA_FLAG_AUTHORIZED) |
2249 BIT(NL80211_STA_FLAG_SHORT_PREAMBLE) |
2250 BIT(NL80211_STA_FLAG_WME) |
2251 BIT(NL80211_STA_FLAG_MFP) |
2252 BIT(NL80211_STA_FLAG_AUTHENTICATED) |
2253 BIT(NL80211_STA_FLAG_ASSOCIATED) |
2254 BIT(NL80211_STA_FLAG_TDLS_PEER);
2255 if (test_sta_flag(sta, WLAN_STA_AUTHORIZED))
2256 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_AUTHORIZED);
2257 if (test_sta_flag(sta, WLAN_STA_SHORT_PREAMBLE))
2258 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_SHORT_PREAMBLE);
2259 if (sta->sta.wme)
2260 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_WME);
2261 if (test_sta_flag(sta, WLAN_STA_MFP))
2262 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_MFP);
2263 if (test_sta_flag(sta, WLAN_STA_AUTH))
2264 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_AUTHENTICATED);
2265 if (test_sta_flag(sta, WLAN_STA_ASSOC))
2266 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_ASSOCIATED);
2267 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER))
2268 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_TDLS_PEER);
2269
2270 thr = sta_get_expected_throughput(sta);
2271
2272 if (thr != 0) {
2273 sinfo->filled |= BIT(NL80211_STA_INFO_EXPECTED_THROUGHPUT);
2274 sinfo->expected_throughput = thr;
2275 }
2276 }
2277
2278 u32 sta_get_expected_throughput(struct sta_info *sta)
2279 {
2280 struct ieee80211_sub_if_data *sdata = sta->sdata;
2281 struct ieee80211_local *local = sdata->local;
2282 struct rate_control_ref *ref = NULL;
2283 u32 thr = 0;
2284
2285 if (test_sta_flag(sta, WLAN_STA_RATE_CONTROL))
2286 ref = local->rate_ctrl;
2287
2288 /* check if the driver has a SW RC implementation */
2289 if (ref && ref->ops->get_expected_throughput)
2290 thr = ref->ops->get_expected_throughput(sta->rate_ctrl_priv);
2291 else
2292 thr = drv_get_expected_throughput(local, sta);
2293
2294 return thr;
2295 }
2296
2297 unsigned long ieee80211_sta_last_active(struct sta_info *sta)
2298 {
2299 struct ieee80211_sta_rx_stats *stats = sta_get_last_rx_stats(sta);
2300
2301 if (time_after(stats->last_rx, sta->status_stats.last_ack))
2302 return stats->last_rx;
2303 return sta->status_stats.last_ack;
2304 }
Linux with added FPC-III support