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Merge branch 'for-linus' of git://git.kernel.dk/linux-block
[linux/fpc-iii.git] / net / mac80211 / sta_info.c
blob69615016d5bf60cb89f46056f3faf7c6f2fd3ce4
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 - 2017 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/codel.h>
24 #include <net/mac80211.h>
25 #include "ieee80211_i.h"
26 #include "driver-ops.h"
27 #include "rate.h"
28 #include "sta_info.h"
29 #include "debugfs_sta.h"
30 #include "mesh.h"
31 #include "wme.h"
32
33 /**
34 * DOC: STA information lifetime rules
35 *
36 * STA info structures (&struct sta_info) are managed in a hash table
37 * for faster lookup and a list for iteration. They are managed using
38 * RCU, i.e. access to the list and hash table is protected by RCU.
39 *
40 * Upon allocating a STA info structure with sta_info_alloc(), the caller
41 * owns that structure. It must then insert it into the hash table using
42 * either sta_info_insert() or sta_info_insert_rcu(); only in the latter
43 * case (which acquires an rcu read section but must not be called from
44 * within one) will the pointer still be valid after the call. Note that
45 * the caller may not do much with the STA info before inserting it, in
46 * particular, it may not start any mesh peer link management or add
47 * encryption keys.
48 *
49 * When the insertion fails (sta_info_insert()) returns non-zero), the
50 * structure will have been freed by sta_info_insert()!
51 *
52 * Station entries are added by mac80211 when you establish a link with a
53 * peer. This means different things for the different type of interfaces
54 * we support. For a regular station this mean we add the AP sta when we
55 * receive an association response from the AP. For IBSS this occurs when
56 * get to know about a peer on the same IBSS. For WDS we add the sta for
57 * the peer immediately upon device open. When using AP mode we add stations
58 * for each respective station upon request from userspace through nl80211.
59 *
60 * In order to remove a STA info structure, various sta_info_destroy_*()
61 * calls are available.
62 *
63 * There is no concept of ownership on a STA entry, each structure is
64 * owned by the global hash table/list until it is removed. All users of
65 * the structure need to be RCU protected so that the structure won't be
66 * freed before they are done using it.
67 */
68
69 static const struct rhashtable_params sta_rht_params = {
70 .nelem_hint = 3, /* start small */
71 .automatic_shrinking = true,
72 .head_offset = offsetof(struct sta_info, hash_node),
73 .key_offset = offsetof(struct sta_info, addr),
74 .key_len = ETH_ALEN,
75 .max_size = CONFIG_MAC80211_STA_HASH_MAX_SIZE,
76 };
77
78 /* Caller must hold local->sta_mtx */
79 static int sta_info_hash_del(struct ieee80211_local *local,
80 struct sta_info *sta)
81 {
82 return rhltable_remove(&local->sta_hash, &sta->hash_node,
83 sta_rht_params);
84 }
85
86 static void __cleanup_single_sta(struct sta_info *sta)
87 {
88 int ac, i;
89 struct tid_ampdu_tx *tid_tx;
90 struct ieee80211_sub_if_data *sdata = sta->sdata;
91 struct ieee80211_local *local = sdata->local;
92 struct fq *fq = &local->fq;
93 struct ps_data *ps;
94
95 if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
96 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
97 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) {
98 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
99 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
100 ps = &sdata->bss->ps;
101 else if (ieee80211_vif_is_mesh(&sdata->vif))
102 ps = &sdata->u.mesh.ps;
103 else
104 return;
105
106 clear_sta_flag(sta, WLAN_STA_PS_STA);
107 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
108 clear_sta_flag(sta, WLAN_STA_PS_DELIVER);
109
110 atomic_dec(&ps->num_sta_ps);
111 }
112
113 if (sta->sta.txq[0]) {
114 for (i = 0; i < ARRAY_SIZE(sta->sta.txq); i++) {
115 struct txq_info *txqi = to_txq_info(sta->sta.txq[i]);
116
117 spin_lock_bh(&fq->lock);
118 ieee80211_txq_purge(local, txqi);
119 spin_unlock_bh(&fq->lock);
120 }
121 }
122
123 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
124 local->total_ps_buffered -= skb_queue_len(&sta->ps_tx_buf[ac]);
125 ieee80211_purge_tx_queue(&local->hw, &sta->ps_tx_buf[ac]);
126 ieee80211_purge_tx_queue(&local->hw, &sta->tx_filtered[ac]);
127 }
128
129 if (ieee80211_vif_is_mesh(&sdata->vif))
130 mesh_sta_cleanup(sta);
131
132 cancel_work_sync(&sta->drv_deliver_wk);
133
134 /*
135 * Destroy aggregation state here. It would be nice to wait for the
136 * driver to finish aggregation stop and then clean up, but for now
137 * drivers have to handle aggregation stop being requested, followed
138 * directly by station destruction.
139 */
140 for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
141 kfree(sta->ampdu_mlme.tid_start_tx[i]);
142 tid_tx = rcu_dereference_raw(sta->ampdu_mlme.tid_tx[i]);
143 if (!tid_tx)
144 continue;
145 ieee80211_purge_tx_queue(&local->hw, &tid_tx->pending);
146 kfree(tid_tx);
147 }
148 }
149
150 static void cleanup_single_sta(struct sta_info *sta)
151 {
152 struct ieee80211_sub_if_data *sdata = sta->sdata;
153 struct ieee80211_local *local = sdata->local;
154
155 __cleanup_single_sta(sta);
156 sta_info_free(local, sta);
157 }
158
159 struct rhlist_head *sta_info_hash_lookup(struct ieee80211_local *local,
160 const u8 *addr)
161 {
162 return rhltable_lookup(&local->sta_hash, addr, sta_rht_params);
163 }
164
165 /* protected by RCU */
166 struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata,
167 const u8 *addr)
168 {
169 struct ieee80211_local *local = sdata->local;
170 struct rhlist_head *tmp;
171 struct sta_info *sta;
172
173 rcu_read_lock();
174 for_each_sta_info(local, addr, sta, tmp) {
175 if (sta->sdata == sdata) {
176 rcu_read_unlock();
177 /* this is safe as the caller must already hold
178 * another rcu read section or the mutex
179 */
180 return sta;
181 }
182 }
183 rcu_read_unlock();
184 return NULL;
185 }
186
187 /*
188 * Get sta info either from the specified interface
189 * or from one of its vlans
190 */
191 struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata,
192 const u8 *addr)
193 {
194 struct ieee80211_local *local = sdata->local;
195 struct rhlist_head *tmp;
196 struct sta_info *sta;
197
198 rcu_read_lock();
199 for_each_sta_info(local, addr, sta, tmp) {
200 if (sta->sdata == sdata ||
201 (sta->sdata->bss && sta->sdata->bss == sdata->bss)) {
202 rcu_read_unlock();
203 /* this is safe as the caller must already hold
204 * another rcu read section or the mutex
205 */
206 return sta;
207 }
208 }
209 rcu_read_unlock();
210 return NULL;
211 }
212
213 struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
214 int idx)
215 {
216 struct ieee80211_local *local = sdata->local;
217 struct sta_info *sta;
218 int i = 0;
219
220 list_for_each_entry_rcu(sta, &local->sta_list, list) {
221 if (sdata != sta->sdata)
222 continue;
223 if (i < idx) {
224 ++i;
225 continue;
226 }
227 return sta;
228 }
229
230 return NULL;
231 }
232
233 /**
234 * sta_info_free - free STA
235 *
236 * @local: pointer to the global information
237 * @sta: STA info to free
238 *
239 * This function must undo everything done by sta_info_alloc()
240 * that may happen before sta_info_insert(). It may only be
241 * called when sta_info_insert() has not been attempted (and
242 * if that fails, the station is freed anyway.)
243 */
244 void sta_info_free(struct ieee80211_local *local, struct sta_info *sta)
245 {
246 if (sta->rate_ctrl)
247 rate_control_free_sta(sta);
248
249 sta_dbg(sta->sdata, "Destroyed STA %pM\n", sta->sta.addr);
250
251 if (sta->sta.txq[0])
252 kfree(to_txq_info(sta->sta.txq[0]));
253 kfree(rcu_dereference_raw(sta->sta.rates));
254 #ifdef CONFIG_MAC80211_MESH
255 kfree(sta->mesh);
256 #endif
257 free_percpu(sta->pcpu_rx_stats);
258 kfree(sta);
259 }
260
261 /* Caller must hold local->sta_mtx */
262 static int sta_info_hash_add(struct ieee80211_local *local,
263 struct sta_info *sta)
264 {
265 return rhltable_insert(&local->sta_hash, &sta->hash_node,
266 sta_rht_params);
267 }
268
269 static void sta_deliver_ps_frames(struct work_struct *wk)
270 {
271 struct sta_info *sta;
272
273 sta = container_of(wk, struct sta_info, drv_deliver_wk);
274
275 if (sta->dead)
276 return;
277
278 local_bh_disable();
279 if (!test_sta_flag(sta, WLAN_STA_PS_STA))
280 ieee80211_sta_ps_deliver_wakeup(sta);
281 else if (test_and_clear_sta_flag(sta, WLAN_STA_PSPOLL))
282 ieee80211_sta_ps_deliver_poll_response(sta);
283 else if (test_and_clear_sta_flag(sta, WLAN_STA_UAPSD))
284 ieee80211_sta_ps_deliver_uapsd(sta);
285 local_bh_enable();
286 }
287
288 static int sta_prepare_rate_control(struct ieee80211_local *local,
289 struct sta_info *sta, gfp_t gfp)
290 {
291 if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL))
292 return 0;
293
294 sta->rate_ctrl = local->rate_ctrl;
295 sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl,
296 sta, gfp);
297 if (!sta->rate_ctrl_priv)
298 return -ENOMEM;
299
300 return 0;
301 }
302
303 struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
304 const u8 *addr, gfp_t gfp)
305 {
306 struct ieee80211_local *local = sdata->local;
307 struct ieee80211_hw *hw = &local->hw;
308 struct sta_info *sta;
309 int i;
310
311 sta = kzalloc(sizeof(*sta) + hw->sta_data_size, gfp);
312 if (!sta)
313 return NULL;
314
315 if (ieee80211_hw_check(hw, USES_RSS)) {
316 sta->pcpu_rx_stats =
317 alloc_percpu(struct ieee80211_sta_rx_stats);
318 if (!sta->pcpu_rx_stats)
319 goto free;
320 }
321
322 spin_lock_init(&sta->lock);
323 spin_lock_init(&sta->ps_lock);
324 INIT_WORK(&sta->drv_deliver_wk, sta_deliver_ps_frames);
325 INIT_WORK(&sta->ampdu_mlme.work, ieee80211_ba_session_work);
326 mutex_init(&sta->ampdu_mlme.mtx);
327 #ifdef CONFIG_MAC80211_MESH
328 if (ieee80211_vif_is_mesh(&sdata->vif)) {
329 sta->mesh = kzalloc(sizeof(*sta->mesh), gfp);
330 if (!sta->mesh)
331 goto free;
332 spin_lock_init(&sta->mesh->plink_lock);
333 if (ieee80211_vif_is_mesh(&sdata->vif) &&
334 !sdata->u.mesh.user_mpm)
335 init_timer(&sta->mesh->plink_timer);
336 sta->mesh->nonpeer_pm = NL80211_MESH_POWER_ACTIVE;
337 }
338 #endif
339
340 memcpy(sta->addr, addr, ETH_ALEN);
341 memcpy(sta->sta.addr, addr, ETH_ALEN);
342 sta->sta.max_rx_aggregation_subframes =
343 local->hw.max_rx_aggregation_subframes;
344
345 sta->local = local;
346 sta->sdata = sdata;
347 sta->rx_stats.last_rx = jiffies;
348
349 u64_stats_init(&sta->rx_stats.syncp);
350
351 sta->sta_state = IEEE80211_STA_NONE;
352
353 /* Mark TID as unreserved */
354 sta->reserved_tid = IEEE80211_TID_UNRESERVED;
355
356 sta->last_connected = ktime_get_seconds();
357 ewma_signal_init(&sta->rx_stats_avg.signal);
358 for (i = 0; i < ARRAY_SIZE(sta->rx_stats_avg.chain_signal); i++)
359 ewma_signal_init(&sta->rx_stats_avg.chain_signal[i]);
360
361 if (local->ops->wake_tx_queue) {
362 void *txq_data;
363 int size = sizeof(struct txq_info) +
364 ALIGN(hw->txq_data_size, sizeof(void *));
365
366 txq_data = kcalloc(ARRAY_SIZE(sta->sta.txq), size, gfp);
367 if (!txq_data)
368 goto free;
369
370 for (i = 0; i < ARRAY_SIZE(sta->sta.txq); i++) {
371 struct txq_info *txq = txq_data + i * size;
372
373 ieee80211_txq_init(sdata, sta, txq, i);
374 }
375 }
376
377 if (sta_prepare_rate_control(local, sta, gfp))
378 goto free_txq;
379
380 for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
381 /*
382 * timer_to_tid must be initialized with identity mapping
383 * to enable session_timer's data differentiation. See
384 * sta_rx_agg_session_timer_expired for usage.
385 */
386 sta->timer_to_tid[i] = i;
387 }
388 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
389 skb_queue_head_init(&sta->ps_tx_buf[i]);
390 skb_queue_head_init(&sta->tx_filtered[i]);
391 }
392
393 for (i = 0; i < IEEE80211_NUM_TIDS; i++)
394 sta->last_seq_ctrl[i] = cpu_to_le16(USHRT_MAX);
395
396 sta->sta.smps_mode = IEEE80211_SMPS_OFF;
397 if (sdata->vif.type == NL80211_IFTYPE_AP ||
398 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
399 struct ieee80211_supported_band *sband;
400 u8 smps;
401
402 sband = ieee80211_get_sband(sdata);
403 if (!sband)
404 goto free_txq;
405
406 smps = (sband->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >>
407 IEEE80211_HT_CAP_SM_PS_SHIFT;
408 /*
409 * Assume that hostapd advertises our caps in the beacon and
410 * this is the known_smps_mode for a station that just assciated
411 */
412 switch (smps) {
413 case WLAN_HT_SMPS_CONTROL_DISABLED:
414 sta->known_smps_mode = IEEE80211_SMPS_OFF;
415 break;
416 case WLAN_HT_SMPS_CONTROL_STATIC:
417 sta->known_smps_mode = IEEE80211_SMPS_STATIC;
418 break;
419 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
420 sta->known_smps_mode = IEEE80211_SMPS_DYNAMIC;
421 break;
422 default:
423 WARN_ON(1);
424 }
425 }
426
427 sta->sta.max_rc_amsdu_len = IEEE80211_MAX_MPDU_LEN_HT_BA;
428
429 sta->cparams.ce_threshold = CODEL_DISABLED_THRESHOLD;
430 sta->cparams.target = MS2TIME(20);
431 sta->cparams.interval = MS2TIME(100);
432 sta->cparams.ecn = true;
433
434 sta_dbg(sdata, "Allocated STA %pM\n", sta->sta.addr);
435
436 return sta;
437
438 free_txq:
439 if (sta->sta.txq[0])
440 kfree(to_txq_info(sta->sta.txq[0]));
441 free:
442 #ifdef CONFIG_MAC80211_MESH
443 kfree(sta->mesh);
444 #endif
445 kfree(sta);
446 return NULL;
447 }
448
449 static int sta_info_insert_check(struct sta_info *sta)
450 {
451 struct ieee80211_sub_if_data *sdata = sta->sdata;
452
453 /*
454 * Can't be a WARN_ON because it can be triggered through a race:
455 * something inserts a STA (on one CPU) without holding the RTNL
456 * and another CPU turns off the net device.
457 */
458 if (unlikely(!ieee80211_sdata_running(sdata)))
459 return -ENETDOWN;
460
461 if (WARN_ON(ether_addr_equal(sta->sta.addr, sdata->vif.addr) ||
462 is_multicast_ether_addr(sta->sta.addr)))
463 return -EINVAL;
464
465 /* The RCU read lock is required by rhashtable due to
466 * asynchronous resize/rehash. We also require the mutex
467 * for correctness.
468 */
469 rcu_read_lock();
470 lockdep_assert_held(&sdata->local->sta_mtx);
471 if (ieee80211_hw_check(&sdata->local->hw, NEEDS_UNIQUE_STA_ADDR) &&
472 ieee80211_find_sta_by_ifaddr(&sdata->local->hw, sta->addr, NULL)) {
473 rcu_read_unlock();
474 return -ENOTUNIQ;
475 }
476 rcu_read_unlock();
477
478 return 0;
479 }
480
481 static int sta_info_insert_drv_state(struct ieee80211_local *local,
482 struct ieee80211_sub_if_data *sdata,
483 struct sta_info *sta)
484 {
485 enum ieee80211_sta_state state;
486 int err = 0;
487
488 for (state = IEEE80211_STA_NOTEXIST; state < sta->sta_state; state++) {
489 err = drv_sta_state(local, sdata, sta, state, state + 1);
490 if (err)
491 break;
492 }
493
494 if (!err) {
495 /*
496 * Drivers using legacy sta_add/sta_remove callbacks only
497 * get uploaded set to true after sta_add is called.
498 */
499 if (!local->ops->sta_add)
500 sta->uploaded = true;
501 return 0;
502 }
503
504 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
505 sdata_info(sdata,
506 "failed to move IBSS STA %pM to state %d (%d) - keeping it anyway\n",
507 sta->sta.addr, state + 1, err);
508 err = 0;
509 }
510
511 /* unwind on error */
512 for (; state > IEEE80211_STA_NOTEXIST; state--)
513 WARN_ON(drv_sta_state(local, sdata, sta, state, state - 1));
514
515 return err;
516 }
517
518 /*
519 * should be called with sta_mtx locked
520 * this function replaces the mutex lock
521 * with a RCU lock
522 */
523 static int sta_info_insert_finish(struct sta_info *sta) __acquires(RCU)
524 {
525 struct ieee80211_local *local = sta->local;
526 struct ieee80211_sub_if_data *sdata = sta->sdata;
527 struct station_info *sinfo = NULL;
528 int err = 0;
529
530 lockdep_assert_held(&local->sta_mtx);
531
532 /* check if STA exists already */
533 if (sta_info_get_bss(sdata, sta->sta.addr)) {
534 err = -EEXIST;
535 goto out_err;
536 }
537
538 sinfo = kzalloc(sizeof(struct station_info), GFP_KERNEL);
539 if (!sinfo) {
540 err = -ENOMEM;
541 goto out_err;
542 }
543
544 local->num_sta++;
545 local->sta_generation++;
546 smp_mb();
547
548 /* simplify things and don't accept BA sessions yet */
549 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
550
551 /* make the station visible */
552 err = sta_info_hash_add(local, sta);
553 if (err)
554 goto out_drop_sta;
555
556 list_add_tail_rcu(&sta->list, &local->sta_list);
557
558 /* notify driver */
559 err = sta_info_insert_drv_state(local, sdata, sta);
560 if (err)
561 goto out_remove;
562
563 set_sta_flag(sta, WLAN_STA_INSERTED);
564 /* accept BA sessions now */
565 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
566
567 ieee80211_sta_debugfs_add(sta);
568 rate_control_add_sta_debugfs(sta);
569
570 sinfo->generation = local->sta_generation;
571 cfg80211_new_sta(sdata->dev, sta->sta.addr, sinfo, GFP_KERNEL);
572 kfree(sinfo);
573
574 sta_dbg(sdata, "Inserted STA %pM\n", sta->sta.addr);
575
576 /* move reference to rcu-protected */
577 rcu_read_lock();
578 mutex_unlock(&local->sta_mtx);
579
580 if (ieee80211_vif_is_mesh(&sdata->vif))
581 mesh_accept_plinks_update(sdata);
582
583 return 0;
584 out_remove:
585 sta_info_hash_del(local, sta);
586 list_del_rcu(&sta->list);
587 out_drop_sta:
588 local->num_sta--;
589 synchronize_net();
590 __cleanup_single_sta(sta);
591 out_err:
592 mutex_unlock(&local->sta_mtx);
593 kfree(sinfo);
594 rcu_read_lock();
595 return err;
596 }
597
598 int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU)
599 {
600 struct ieee80211_local *local = sta->local;
601 int err;
602
603 might_sleep();
604
605 mutex_lock(&local->sta_mtx);
606
607 err = sta_info_insert_check(sta);
608 if (err) {
609 mutex_unlock(&local->sta_mtx);
610 rcu_read_lock();
611 goto out_free;
612 }
613
614 err = sta_info_insert_finish(sta);
615 if (err)
616 goto out_free;
617
618 return 0;
619 out_free:
620 sta_info_free(local, sta);
621 return err;
622 }
623
624 int sta_info_insert(struct sta_info *sta)
625 {
626 int err = sta_info_insert_rcu(sta);
627
628 rcu_read_unlock();
629
630 return err;
631 }
632
633 static inline void __bss_tim_set(u8 *tim, u16 id)
634 {
635 /*
636 * This format has been mandated by the IEEE specifications,
637 * so this line may not be changed to use the __set_bit() format.
638 */
639 tim[id / 8] |= (1 << (id % 8));
640 }
641
642 static inline void __bss_tim_clear(u8 *tim, u16 id)
643 {
644 /*
645 * This format has been mandated by the IEEE specifications,
646 * so this line may not be changed to use the __clear_bit() format.
647 */
648 tim[id / 8] &= ~(1 << (id % 8));
649 }
650
651 static inline bool __bss_tim_get(u8 *tim, u16 id)
652 {
653 /*
654 * This format has been mandated by the IEEE specifications,
655 * so this line may not be changed to use the test_bit() format.
656 */
657 return tim[id / 8] & (1 << (id % 8));
658 }
659
660 static unsigned long ieee80211_tids_for_ac(int ac)
661 {
662 /* If we ever support TIDs > 7, this obviously needs to be adjusted */
663 switch (ac) {
664 case IEEE80211_AC_VO:
665 return BIT(6) | BIT(7);
666 case IEEE80211_AC_VI:
667 return BIT(4) | BIT(5);
668 case IEEE80211_AC_BE:
669 return BIT(0) | BIT(3);
670 case IEEE80211_AC_BK:
671 return BIT(1) | BIT(2);
672 default:
673 WARN_ON(1);
674 return 0;
675 }
676 }
677
678 static void __sta_info_recalc_tim(struct sta_info *sta, bool ignore_pending)
679 {
680 struct ieee80211_local *local = sta->local;
681 struct ps_data *ps;
682 bool indicate_tim = false;
683 u8 ignore_for_tim = sta->sta.uapsd_queues;
684 int ac;
685 u16 id = sta->sta.aid;
686
687 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
688 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
689 if (WARN_ON_ONCE(!sta->sdata->bss))
690 return;
691
692 ps = &sta->sdata->bss->ps;
693 #ifdef CONFIG_MAC80211_MESH
694 } else if (ieee80211_vif_is_mesh(&sta->sdata->vif)) {
695 ps = &sta->sdata->u.mesh.ps;
696 #endif
697 } else {
698 return;
699 }
700
701 /* No need to do anything if the driver does all */
702 if (ieee80211_hw_check(&local->hw, AP_LINK_PS) && !local->ops->set_tim)
703 return;
704
705 if (sta->dead)
706 goto done;
707
708 /*
709 * If all ACs are delivery-enabled then we should build
710 * the TIM bit for all ACs anyway; if only some are then
711 * we ignore those and build the TIM bit using only the
712 * non-enabled ones.
713 */
714 if (ignore_for_tim == BIT(IEEE80211_NUM_ACS) - 1)
715 ignore_for_tim = 0;
716
717 if (ignore_pending)
718 ignore_for_tim = BIT(IEEE80211_NUM_ACS) - 1;
719
720 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
721 unsigned long tids;
722
723 if (ignore_for_tim & ieee80211_ac_to_qos_mask[ac])
724 continue;
725
726 indicate_tim |= !skb_queue_empty(&sta->tx_filtered[ac]) ||
727 !skb_queue_empty(&sta->ps_tx_buf[ac]);
728 if (indicate_tim)
729 break;
730
731 tids = ieee80211_tids_for_ac(ac);
732
733 indicate_tim |=
734 sta->driver_buffered_tids & tids;
735 indicate_tim |=
736 sta->txq_buffered_tids & tids;
737 }
738
739 done:
740 spin_lock_bh(&local->tim_lock);
741
742 if (indicate_tim == __bss_tim_get(ps->tim, id))
743 goto out_unlock;
744
745 if (indicate_tim)
746 __bss_tim_set(ps->tim, id);
747 else
748 __bss_tim_clear(ps->tim, id);
749
750 if (local->ops->set_tim && !WARN_ON(sta->dead)) {
751 local->tim_in_locked_section = true;
752 drv_set_tim(local, &sta->sta, indicate_tim);
753 local->tim_in_locked_section = false;
754 }
755
756 out_unlock:
757 spin_unlock_bh(&local->tim_lock);
758 }
759
760 void sta_info_recalc_tim(struct sta_info *sta)
761 {
762 __sta_info_recalc_tim(sta, false);
763 }
764
765 static bool sta_info_buffer_expired(struct sta_info *sta, struct sk_buff *skb)
766 {
767 struct ieee80211_tx_info *info;
768 int timeout;
769
770 if (!skb)
771 return false;
772
773 info = IEEE80211_SKB_CB(skb);
774
775 /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
776 timeout = (sta->listen_interval *
777 sta->sdata->vif.bss_conf.beacon_int *
778 32 / 15625) * HZ;
779 if (timeout < STA_TX_BUFFER_EXPIRE)
780 timeout = STA_TX_BUFFER_EXPIRE;
781 return time_after(jiffies, info->control.jiffies + timeout);
782 }
783
784
785 static bool sta_info_cleanup_expire_buffered_ac(struct ieee80211_local *local,
786 struct sta_info *sta, int ac)
787 {
788 unsigned long flags;
789 struct sk_buff *skb;
790
791 /*
792 * First check for frames that should expire on the filtered
793 * queue. Frames here were rejected by the driver and are on
794 * a separate queue to avoid reordering with normal PS-buffered
795 * frames. They also aren't accounted for right now in the
796 * total_ps_buffered counter.
797 */
798 for (;;) {
799 spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
800 skb = skb_peek(&sta->tx_filtered[ac]);
801 if (sta_info_buffer_expired(sta, skb))
802 skb = __skb_dequeue(&sta->tx_filtered[ac]);
803 else
804 skb = NULL;
805 spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
806
807 /*
808 * Frames are queued in order, so if this one
809 * hasn't expired yet we can stop testing. If
810 * we actually reached the end of the queue we
811 * also need to stop, of course.
812 */
813 if (!skb)
814 break;
815 ieee80211_free_txskb(&local->hw, skb);
816 }
817
818 /*
819 * Now also check the normal PS-buffered queue, this will
820 * only find something if the filtered queue was emptied
821 * since the filtered frames are all before the normal PS
822 * buffered frames.
823 */
824 for (;;) {
825 spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
826 skb = skb_peek(&sta->ps_tx_buf[ac]);
827 if (sta_info_buffer_expired(sta, skb))
828 skb = __skb_dequeue(&sta->ps_tx_buf[ac]);
829 else
830 skb = NULL;
831 spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
832
833 /*
834 * frames are queued in order, so if this one
835 * hasn't expired yet (or we reached the end of
836 * the queue) we can stop testing
837 */
838 if (!skb)
839 break;
840
841 local->total_ps_buffered--;
842 ps_dbg(sta->sdata, "Buffered frame expired (STA %pM)\n",
843 sta->sta.addr);
844 ieee80211_free_txskb(&local->hw, skb);
845 }
846
847 /*
848 * Finally, recalculate the TIM bit for this station -- it might
849 * now be clear because the station was too slow to retrieve its
850 * frames.
851 */
852 sta_info_recalc_tim(sta);
853
854 /*
855 * Return whether there are any frames still buffered, this is
856 * used to check whether the cleanup timer still needs to run,
857 * if there are no frames we don't need to rearm the timer.
858 */
859 return !(skb_queue_empty(&sta->ps_tx_buf[ac]) &&
860 skb_queue_empty(&sta->tx_filtered[ac]));
861 }
862
863 static bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
864 struct sta_info *sta)
865 {
866 bool have_buffered = false;
867 int ac;
868
869 /* This is only necessary for stations on BSS/MBSS interfaces */
870 if (!sta->sdata->bss &&
871 !ieee80211_vif_is_mesh(&sta->sdata->vif))
872 return false;
873
874 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
875 have_buffered |=
876 sta_info_cleanup_expire_buffered_ac(local, sta, ac);
877
878 return have_buffered;
879 }
880
881 static int __must_check __sta_info_destroy_part1(struct sta_info *sta)
882 {
883 struct ieee80211_local *local;
884 struct ieee80211_sub_if_data *sdata;
885 int ret;
886
887 might_sleep();
888
889 if (!sta)
890 return -ENOENT;
891
892 local = sta->local;
893 sdata = sta->sdata;
894
895 lockdep_assert_held(&local->sta_mtx);
896
897 /*
898 * Before removing the station from the driver and
899 * rate control, it might still start new aggregation
900 * sessions -- block that to make sure the tear-down
901 * will be sufficient.
902 */
903 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
904 ieee80211_sta_tear_down_BA_sessions(sta, AGG_STOP_DESTROY_STA);
905
906 /*
907 * Before removing the station from the driver there might be pending
908 * rx frames on RSS queues sent prior to the disassociation - wait for
909 * all such frames to be processed.
910 */
911 drv_sync_rx_queues(local, sta);
912
913 ret = sta_info_hash_del(local, sta);
914 if (WARN_ON(ret))
915 return ret;
916
917 /*
918 * for TDLS peers, make sure to return to the base channel before
919 * removal.
920 */
921 if (test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) {
922 drv_tdls_cancel_channel_switch(local, sdata, &sta->sta);
923 clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
924 }
925
926 list_del_rcu(&sta->list);
927 sta->removed = true;
928
929 drv_sta_pre_rcu_remove(local, sta->sdata, sta);
930
931 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
932 rcu_access_pointer(sdata->u.vlan.sta) == sta)
933 RCU_INIT_POINTER(sdata->u.vlan.sta, NULL);
934
935 return 0;
936 }
937
938 static void __sta_info_destroy_part2(struct sta_info *sta)
939 {
940 struct ieee80211_local *local = sta->local;
941 struct ieee80211_sub_if_data *sdata = sta->sdata;
942 struct station_info *sinfo;
943 int ret;
944
945 /*
946 * NOTE: This assumes at least synchronize_net() was done
947 * after _part1 and before _part2!
948 */
949
950 might_sleep();
951 lockdep_assert_held(&local->sta_mtx);
952
953 /* now keys can no longer be reached */
954 ieee80211_free_sta_keys(local, sta);
955
956 /* disable TIM bit - last chance to tell driver */
957 __sta_info_recalc_tim(sta, true);
958
959 sta->dead = true;
960
961 local->num_sta--;
962 local->sta_generation++;
963
964 while (sta->sta_state > IEEE80211_STA_NONE) {
965 ret = sta_info_move_state(sta, sta->sta_state - 1);
966 if (ret) {
967 WARN_ON_ONCE(1);
968 break;
969 }
970 }
971
972 if (sta->uploaded) {
973 ret = drv_sta_state(local, sdata, sta, IEEE80211_STA_NONE,
974 IEEE80211_STA_NOTEXIST);
975 WARN_ON_ONCE(ret != 0);
976 }
977
978 sta_dbg(sdata, "Removed STA %pM\n", sta->sta.addr);
979
980 sinfo = kzalloc(sizeof(*sinfo), GFP_KERNEL);
981 if (sinfo)
982 sta_set_sinfo(sta, sinfo);
983 cfg80211_del_sta_sinfo(sdata->dev, sta->sta.addr, sinfo, GFP_KERNEL);
984 kfree(sinfo);
985
986 rate_control_remove_sta_debugfs(sta);
987 ieee80211_sta_debugfs_remove(sta);
988
989 cleanup_single_sta(sta);
990 }
991
992 int __must_check __sta_info_destroy(struct sta_info *sta)
993 {
994 int err = __sta_info_destroy_part1(sta);
995
996 if (err)
997 return err;
998
999 synchronize_net();
1000
1001 __sta_info_destroy_part2(sta);
1002
1003 return 0;
1004 }
1005
1006 int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, const u8 *addr)
1007 {
1008 struct sta_info *sta;
1009 int ret;
1010
1011 mutex_lock(&sdata->local->sta_mtx);
1012 sta = sta_info_get(sdata, addr);
1013 ret = __sta_info_destroy(sta);
1014 mutex_unlock(&sdata->local->sta_mtx);
1015
1016 return ret;
1017 }
1018
1019 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
1020 const u8 *addr)
1021 {
1022 struct sta_info *sta;
1023 int ret;
1024
1025 mutex_lock(&sdata->local->sta_mtx);
1026 sta = sta_info_get_bss(sdata, addr);
1027 ret = __sta_info_destroy(sta);
1028 mutex_unlock(&sdata->local->sta_mtx);
1029
1030 return ret;
1031 }
1032
1033 static void sta_info_cleanup(unsigned long data)
1034 {
1035 struct ieee80211_local *local = (struct ieee80211_local *) data;
1036 struct sta_info *sta;
1037 bool timer_needed = false;
1038
1039 rcu_read_lock();
1040 list_for_each_entry_rcu(sta, &local->sta_list, list)
1041 if (sta_info_cleanup_expire_buffered(local, sta))
1042 timer_needed = true;
1043 rcu_read_unlock();
1044
1045 if (local->quiescing)
1046 return;
1047
1048 if (!timer_needed)
1049 return;
1050
1051 mod_timer(&local->sta_cleanup,
1052 round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL));
1053 }
1054
1055 int sta_info_init(struct ieee80211_local *local)
1056 {
1057 int err;
1058
1059 err = rhltable_init(&local->sta_hash, &sta_rht_params);
1060 if (err)
1061 return err;
1062
1063 spin_lock_init(&local->tim_lock);
1064 mutex_init(&local->sta_mtx);
1065 INIT_LIST_HEAD(&local->sta_list);
1066
1067 setup_timer(&local->sta_cleanup, sta_info_cleanup,
1068 (unsigned long)local);
1069 return 0;
1070 }
1071
1072 void sta_info_stop(struct ieee80211_local *local)
1073 {
1074 del_timer_sync(&local->sta_cleanup);
1075 rhltable_destroy(&local->sta_hash);
1076 }
1077
1078
1079 int __sta_info_flush(struct ieee80211_sub_if_data *sdata, bool vlans)
1080 {
1081 struct ieee80211_local *local = sdata->local;
1082 struct sta_info *sta, *tmp;
1083 LIST_HEAD(free_list);
1084 int ret = 0;
1085
1086 might_sleep();
1087
1088 WARN_ON(vlans && sdata->vif.type != NL80211_IFTYPE_AP);
1089 WARN_ON(vlans && !sdata->bss);
1090
1091 mutex_lock(&local->sta_mtx);
1092 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1093 if (sdata == sta->sdata ||
1094 (vlans && sdata->bss == sta->sdata->bss)) {
1095 if (!WARN_ON(__sta_info_destroy_part1(sta)))
1096 list_add(&sta->free_list, &free_list);
1097 ret++;
1098 }
1099 }
1100
1101 if (!list_empty(&free_list)) {
1102 synchronize_net();
1103 list_for_each_entry_safe(sta, tmp, &free_list, free_list)
1104 __sta_info_destroy_part2(sta);
1105 }
1106 mutex_unlock(&local->sta_mtx);
1107
1108 return ret;
1109 }
1110
1111 void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
1112 unsigned long exp_time)
1113 {
1114 struct ieee80211_local *local = sdata->local;
1115 struct sta_info *sta, *tmp;
1116
1117 mutex_lock(&local->sta_mtx);
1118
1119 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1120 unsigned long last_active = ieee80211_sta_last_active(sta);
1121
1122 if (sdata != sta->sdata)
1123 continue;
1124
1125 if (time_is_before_jiffies(last_active + exp_time)) {
1126 sta_dbg(sta->sdata, "expiring inactive STA %pM\n",
1127 sta->sta.addr);
1128
1129 if (ieee80211_vif_is_mesh(&sdata->vif) &&
1130 test_sta_flag(sta, WLAN_STA_PS_STA))
1131 atomic_dec(&sdata->u.mesh.ps.num_sta_ps);
1132
1133 WARN_ON(__sta_info_destroy(sta));
1134 }
1135 }
1136
1137 mutex_unlock(&local->sta_mtx);
1138 }
1139
1140 struct ieee80211_sta *ieee80211_find_sta_by_ifaddr(struct ieee80211_hw *hw,
1141 const u8 *addr,
1142 const u8 *localaddr)
1143 {
1144 struct ieee80211_local *local = hw_to_local(hw);
1145 struct rhlist_head *tmp;
1146 struct sta_info *sta;
1147
1148 /*
1149 * Just return a random station if localaddr is NULL
1150 * ... first in list.
1151 */
1152 for_each_sta_info(local, addr, sta, tmp) {
1153 if (localaddr &&
1154 !ether_addr_equal(sta->sdata->vif.addr, localaddr))
1155 continue;
1156 if (!sta->uploaded)
1157 return NULL;
1158 return &sta->sta;
1159 }
1160
1161 return NULL;
1162 }
1163 EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr);
1164
1165 struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif,
1166 const u8 *addr)
1167 {
1168 struct sta_info *sta;
1169
1170 if (!vif)
1171 return NULL;
1172
1173 sta = sta_info_get_bss(vif_to_sdata(vif), addr);
1174 if (!sta)
1175 return NULL;
1176
1177 if (!sta->uploaded)
1178 return NULL;
1179
1180 return &sta->sta;
1181 }
1182 EXPORT_SYMBOL(ieee80211_find_sta);
1183
1184 /* powersave support code */
1185 void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta)
1186 {
1187 struct ieee80211_sub_if_data *sdata = sta->sdata;
1188 struct ieee80211_local *local = sdata->local;
1189 struct sk_buff_head pending;
1190 int filtered = 0, buffered = 0, ac, i;
1191 unsigned long flags;
1192 struct ps_data *ps;
1193
1194 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1195 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
1196 u.ap);
1197
1198 if (sdata->vif.type == NL80211_IFTYPE_AP)
1199 ps = &sdata->bss->ps;
1200 else if (ieee80211_vif_is_mesh(&sdata->vif))
1201 ps = &sdata->u.mesh.ps;
1202 else
1203 return;
1204
1205 clear_sta_flag(sta, WLAN_STA_SP);
1206
1207 BUILD_BUG_ON(BITS_TO_LONGS(IEEE80211_NUM_TIDS) > 1);
1208 sta->driver_buffered_tids = 0;
1209 sta->txq_buffered_tids = 0;
1210
1211 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
1212 drv_sta_notify(local, sdata, STA_NOTIFY_AWAKE, &sta->sta);
1213
1214 if (sta->sta.txq[0]) {
1215 for (i = 0; i < ARRAY_SIZE(sta->sta.txq); i++) {
1216 if (!txq_has_queue(sta->sta.txq[i]))
1217 continue;
1218
1219 drv_wake_tx_queue(local, to_txq_info(sta->sta.txq[i]));
1220 }
1221 }
1222
1223 skb_queue_head_init(&pending);
1224
1225 /* sync with ieee80211_tx_h_unicast_ps_buf */
1226 spin_lock(&sta->ps_lock);
1227 /* Send all buffered frames to the station */
1228 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1229 int count = skb_queue_len(&pending), tmp;
1230
1231 spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
1232 skb_queue_splice_tail_init(&sta->tx_filtered[ac], &pending);
1233 spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
1234 tmp = skb_queue_len(&pending);
1235 filtered += tmp - count;
1236 count = tmp;
1237
1238 spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
1239 skb_queue_splice_tail_init(&sta->ps_tx_buf[ac], &pending);
1240 spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
1241 tmp = skb_queue_len(&pending);
1242 buffered += tmp - count;
1243 }
1244
1245 ieee80211_add_pending_skbs(local, &pending);
1246
1247 /* now we're no longer in the deliver code */
1248 clear_sta_flag(sta, WLAN_STA_PS_DELIVER);
1249
1250 /* The station might have polled and then woken up before we responded,
1251 * so clear these flags now to avoid them sticking around.
1252 */
1253 clear_sta_flag(sta, WLAN_STA_PSPOLL);
1254 clear_sta_flag(sta, WLAN_STA_UAPSD);
1255 spin_unlock(&sta->ps_lock);
1256
1257 atomic_dec(&ps->num_sta_ps);
1258
1259 /* This station just woke up and isn't aware of our SMPS state */
1260 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
1261 !ieee80211_smps_is_restrictive(sta->known_smps_mode,
1262 sdata->smps_mode) &&
1263 sta->known_smps_mode != sdata->bss->req_smps &&
1264 sta_info_tx_streams(sta) != 1) {
1265 ht_dbg(sdata,
1266 "%pM just woke up and MIMO capable - update SMPS\n",
1267 sta->sta.addr);
1268 ieee80211_send_smps_action(sdata, sdata->bss->req_smps,
1269 sta->sta.addr,
1270 sdata->vif.bss_conf.bssid);
1271 }
1272
1273 local->total_ps_buffered -= buffered;
1274
1275 sta_info_recalc_tim(sta);
1276
1277 ps_dbg(sdata,
1278 "STA %pM aid %d sending %d filtered/%d PS frames since STA woke up\n",
1279 sta->sta.addr, sta->sta.aid, filtered, buffered);
1280
1281 ieee80211_check_fast_xmit(sta);
1282 }
1283
1284 static void ieee80211_send_null_response(struct sta_info *sta, int tid,
1285 enum ieee80211_frame_release_type reason,
1286 bool call_driver, bool more_data)
1287 {
1288 struct ieee80211_sub_if_data *sdata = sta->sdata;
1289 struct ieee80211_local *local = sdata->local;
1290 struct ieee80211_qos_hdr *nullfunc;
1291 struct sk_buff *skb;
1292 int size = sizeof(*nullfunc);
1293 __le16 fc;
1294 bool qos = sta->sta.wme;
1295 struct ieee80211_tx_info *info;
1296 struct ieee80211_chanctx_conf *chanctx_conf;
1297
1298 if (qos) {
1299 fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1300 IEEE80211_STYPE_QOS_NULLFUNC |
1301 IEEE80211_FCTL_FROMDS);
1302 } else {
1303 size -= 2;
1304 fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1305 IEEE80211_STYPE_NULLFUNC |
1306 IEEE80211_FCTL_FROMDS);
1307 }
1308
1309 skb = dev_alloc_skb(local->hw.extra_tx_headroom + size);
1310 if (!skb)
1311 return;
1312
1313 skb_reserve(skb, local->hw.extra_tx_headroom);
1314
1315 nullfunc = skb_put(skb, size);
1316 nullfunc->frame_control = fc;
1317 nullfunc->duration_id = 0;
1318 memcpy(nullfunc->addr1, sta->sta.addr, ETH_ALEN);
1319 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
1320 memcpy(nullfunc->addr3, sdata->vif.addr, ETH_ALEN);
1321 nullfunc->seq_ctrl = 0;
1322
1323 skb->priority = tid;
1324 skb_set_queue_mapping(skb, ieee802_1d_to_ac[tid]);
1325 if (qos) {
1326 nullfunc->qos_ctrl = cpu_to_le16(tid);
1327
1328 if (reason == IEEE80211_FRAME_RELEASE_UAPSD) {
1329 nullfunc->qos_ctrl |=
1330 cpu_to_le16(IEEE80211_QOS_CTL_EOSP);
1331 if (more_data)
1332 nullfunc->frame_control |=
1333 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1334 }
1335 }
1336
1337 info = IEEE80211_SKB_CB(skb);
1338
1339 /*
1340 * Tell TX path to send this frame even though the
1341 * STA may still remain is PS mode after this frame
1342 * exchange. Also set EOSP to indicate this packet
1343 * ends the poll/service period.
1344 */
1345 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER |
1346 IEEE80211_TX_STATUS_EOSP |
1347 IEEE80211_TX_CTL_REQ_TX_STATUS;
1348
1349 info->control.flags |= IEEE80211_TX_CTRL_PS_RESPONSE;
1350
1351 if (call_driver)
1352 drv_allow_buffered_frames(local, sta, BIT(tid), 1,
1353 reason, false);
1354
1355 skb->dev = sdata->dev;
1356
1357 rcu_read_lock();
1358 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1359 if (WARN_ON(!chanctx_conf)) {
1360 rcu_read_unlock();
1361 kfree_skb(skb);
1362 return;
1363 }
1364
1365 info->band = chanctx_conf->def.chan->band;
1366 ieee80211_xmit(sdata, sta, skb);
1367 rcu_read_unlock();
1368 }
1369
1370 static int find_highest_prio_tid(unsigned long tids)
1371 {
1372 /* lower 3 TIDs aren't ordered perfectly */
1373 if (tids & 0xF8)
1374 return fls(tids) - 1;
1375 /* TID 0 is BE just like TID 3 */
1376 if (tids & BIT(0))
1377 return 0;
1378 return fls(tids) - 1;
1379 }
1380
1381 /* Indicates if the MORE_DATA bit should be set in the last
1382 * frame obtained by ieee80211_sta_ps_get_frames.
1383 * Note that driver_release_tids is relevant only if
1384 * reason = IEEE80211_FRAME_RELEASE_PSPOLL
1385 */
1386 static bool
1387 ieee80211_sta_ps_more_data(struct sta_info *sta, u8 ignored_acs,
1388 enum ieee80211_frame_release_type reason,
1389 unsigned long driver_release_tids)
1390 {
1391 int ac;
1392
1393 /* If the driver has data on more than one TID then
1394 * certainly there's more data if we release just a
1395 * single frame now (from a single TID). This will
1396 * only happen for PS-Poll.
1397 */
1398 if (reason == IEEE80211_FRAME_RELEASE_PSPOLL &&
1399 hweight16(driver_release_tids) > 1)
1400 return true;
1401
1402 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1403 if (ignored_acs & ieee80211_ac_to_qos_mask[ac])
1404 continue;
1405
1406 if (!skb_queue_empty(&sta->tx_filtered[ac]) ||
1407 !skb_queue_empty(&sta->ps_tx_buf[ac]))
1408 return true;
1409 }
1410
1411 return false;
1412 }
1413
1414 static void
1415 ieee80211_sta_ps_get_frames(struct sta_info *sta, int n_frames, u8 ignored_acs,
1416 enum ieee80211_frame_release_type reason,
1417 struct sk_buff_head *frames,
1418 unsigned long *driver_release_tids)
1419 {
1420 struct ieee80211_sub_if_data *sdata = sta->sdata;
1421 struct ieee80211_local *local = sdata->local;
1422 int ac;
1423
1424 /* Get response frame(s) and more data bit for the last one. */
1425 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1426 unsigned long tids;
1427
1428 if (ignored_acs & ieee80211_ac_to_qos_mask[ac])
1429 continue;
1430
1431 tids = ieee80211_tids_for_ac(ac);
1432
1433 /* if we already have frames from software, then we can't also
1434 * release from hardware queues
1435 */
1436 if (skb_queue_empty(frames)) {
1437 *driver_release_tids |=
1438 sta->driver_buffered_tids & tids;
1439 *driver_release_tids |= sta->txq_buffered_tids & tids;
1440 }
1441
1442 if (!*driver_release_tids) {
1443 struct sk_buff *skb;
1444
1445 while (n_frames > 0) {
1446 skb = skb_dequeue(&sta->tx_filtered[ac]);
1447 if (!skb) {
1448 skb = skb_dequeue(
1449 &sta->ps_tx_buf[ac]);
1450 if (skb)
1451 local->total_ps_buffered--;
1452 }
1453 if (!skb)
1454 break;
1455 n_frames--;
1456 __skb_queue_tail(frames, skb);
1457 }
1458 }
1459
1460 /* If we have more frames buffered on this AC, then abort the
1461 * loop since we can't send more data from other ACs before
1462 * the buffered frames from this.
1463 */
1464 if (!skb_queue_empty(&sta->tx_filtered[ac]) ||
1465 !skb_queue_empty(&sta->ps_tx_buf[ac]))
1466 break;
1467 }
1468 }
1469
1470 static void
1471 ieee80211_sta_ps_deliver_response(struct sta_info *sta,
1472 int n_frames, u8 ignored_acs,
1473 enum ieee80211_frame_release_type reason)
1474 {
1475 struct ieee80211_sub_if_data *sdata = sta->sdata;
1476 struct ieee80211_local *local = sdata->local;
1477 unsigned long driver_release_tids = 0;
1478 struct sk_buff_head frames;
1479 bool more_data;
1480
1481 /* Service or PS-Poll period starts */
1482 set_sta_flag(sta, WLAN_STA_SP);
1483
1484 __skb_queue_head_init(&frames);
1485
1486 ieee80211_sta_ps_get_frames(sta, n_frames, ignored_acs, reason,
1487 &frames, &driver_release_tids);
1488
1489 more_data = ieee80211_sta_ps_more_data(sta, ignored_acs, reason, driver_release_tids);
1490
1491 if (driver_release_tids && reason == IEEE80211_FRAME_RELEASE_PSPOLL)
1492 driver_release_tids =
1493 BIT(find_highest_prio_tid(driver_release_tids));
1494
1495 if (skb_queue_empty(&frames) && !driver_release_tids) {
1496 int tid, ac;
1497
1498 /*
1499 * For PS-Poll, this can only happen due to a race condition
1500 * when we set the TIM bit and the station notices it, but
1501 * before it can poll for the frame we expire it.
1502 *
1503 * For uAPSD, this is said in the standard (11.2.1.5 h):
1504 * At each unscheduled SP for a non-AP STA, the AP shall
1505 * attempt to transmit at least one MSDU or MMPDU, but no
1506 * more than the value specified in the Max SP Length field
1507 * in the QoS Capability element from delivery-enabled ACs,
1508 * that are destined for the non-AP STA.
1509 *
1510 * Since we have no other MSDU/MMPDU, transmit a QoS null frame.
1511 */
1512
1513 /* This will evaluate to 1, 3, 5 or 7. */
1514 for (ac = IEEE80211_AC_VO; ac < IEEE80211_NUM_ACS; ac++)
1515 if (!(ignored_acs & ieee80211_ac_to_qos_mask[ac]))
1516 break;
1517 tid = 7 - 2 * ac;
1518
1519 ieee80211_send_null_response(sta, tid, reason, true, false);
1520 } else if (!driver_release_tids) {
1521 struct sk_buff_head pending;
1522 struct sk_buff *skb;
1523 int num = 0;
1524 u16 tids = 0;
1525 bool need_null = false;
1526
1527 skb_queue_head_init(&pending);
1528
1529 while ((skb = __skb_dequeue(&frames))) {
1530 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1531 struct ieee80211_hdr *hdr = (void *) skb->data;
1532 u8 *qoshdr = NULL;
1533
1534 num++;
1535
1536 /*
1537 * Tell TX path to send this frame even though the
1538 * STA may still remain is PS mode after this frame
1539 * exchange.
1540 */
1541 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
1542 info->control.flags |= IEEE80211_TX_CTRL_PS_RESPONSE;
1543
1544 /*
1545 * Use MoreData flag to indicate whether there are
1546 * more buffered frames for this STA
1547 */
1548 if (more_data || !skb_queue_empty(&frames))
1549 hdr->frame_control |=
1550 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1551 else
1552 hdr->frame_control &=
1553 cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
1554
1555 if (ieee80211_is_data_qos(hdr->frame_control) ||
1556 ieee80211_is_qos_nullfunc(hdr->frame_control))
1557 qoshdr = ieee80211_get_qos_ctl(hdr);
1558
1559 tids |= BIT(skb->priority);
1560
1561 __skb_queue_tail(&pending, skb);
1562
1563 /* end service period after last frame or add one */
1564 if (!skb_queue_empty(&frames))
1565 continue;
1566
1567 if (reason != IEEE80211_FRAME_RELEASE_UAPSD) {
1568 /* for PS-Poll, there's only one frame */
1569 info->flags |= IEEE80211_TX_STATUS_EOSP |
1570 IEEE80211_TX_CTL_REQ_TX_STATUS;
1571 break;
1572 }
1573
1574 /* For uAPSD, things are a bit more complicated. If the
1575 * last frame has a QoS header (i.e. is a QoS-data or
1576 * QoS-nulldata frame) then just set the EOSP bit there
1577 * and be done.
1578 * If the frame doesn't have a QoS header (which means
1579 * it should be a bufferable MMPDU) then we can't set
1580 * the EOSP bit in the QoS header; add a QoS-nulldata
1581 * frame to the list to send it after the MMPDU.
1582 *
1583 * Note that this code is only in the mac80211-release
1584 * code path, we assume that the driver will not buffer
1585 * anything but QoS-data frames, or if it does, will
1586 * create the QoS-nulldata frame by itself if needed.
1587 *
1588 * Cf. 802.11-2012 10.2.1.10 (c).
1589 */
1590 if (qoshdr) {
1591 *qoshdr |= IEEE80211_QOS_CTL_EOSP;
1592
1593 info->flags |= IEEE80211_TX_STATUS_EOSP |
1594 IEEE80211_TX_CTL_REQ_TX_STATUS;
1595 } else {
1596 /* The standard isn't completely clear on this
1597 * as it says the more-data bit should be set
1598 * if there are more BUs. The QoS-Null frame
1599 * we're about to send isn't buffered yet, we
1600 * only create it below, but let's pretend it
1601 * was buffered just in case some clients only
1602 * expect more-data=0 when eosp=1.
1603 */
1604 hdr->frame_control |=
1605 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1606 need_null = true;
1607 num++;
1608 }
1609 break;
1610 }
1611
1612 drv_allow_buffered_frames(local, sta, tids, num,
1613 reason, more_data);
1614
1615 ieee80211_add_pending_skbs(local, &pending);
1616
1617 if (need_null)
1618 ieee80211_send_null_response(
1619 sta, find_highest_prio_tid(tids),
1620 reason, false, false);
1621
1622 sta_info_recalc_tim(sta);
1623 } else {
1624 int tid;
1625
1626 /*
1627 * We need to release a frame that is buffered somewhere in the
1628 * driver ... it'll have to handle that.
1629 * Note that the driver also has to check the number of frames
1630 * on the TIDs we're releasing from - if there are more than
1631 * n_frames it has to set the more-data bit (if we didn't ask
1632 * it to set it anyway due to other buffered frames); if there
1633 * are fewer than n_frames it has to make sure to adjust that
1634 * to allow the service period to end properly.
1635 */
1636 drv_release_buffered_frames(local, sta, driver_release_tids,
1637 n_frames, reason, more_data);
1638
1639 /*
1640 * Note that we don't recalculate the TIM bit here as it would
1641 * most likely have no effect at all unless the driver told us
1642 * that the TID(s) became empty before returning here from the
1643 * release function.
1644 * Either way, however, when the driver tells us that the TID(s)
1645 * became empty or we find that a txq became empty, we'll do the
1646 * TIM recalculation.
1647 */
1648
1649 if (!sta->sta.txq[0])
1650 return;
1651
1652 for (tid = 0; tid < ARRAY_SIZE(sta->sta.txq); tid++) {
1653 if (!(driver_release_tids & BIT(tid)) ||
1654 txq_has_queue(sta->sta.txq[tid]))
1655 continue;
1656
1657 sta_info_recalc_tim(sta);
1658 break;
1659 }
1660 }
1661 }
1662
1663 void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta)
1664 {
1665 u8 ignore_for_response = sta->sta.uapsd_queues;
1666
1667 /*
1668 * If all ACs are delivery-enabled then we should reply
1669 * from any of them, if only some are enabled we reply
1670 * only from the non-enabled ones.
1671 */
1672 if (ignore_for_response == BIT(IEEE80211_NUM_ACS) - 1)
1673 ignore_for_response = 0;
1674
1675 ieee80211_sta_ps_deliver_response(sta, 1, ignore_for_response,
1676 IEEE80211_FRAME_RELEASE_PSPOLL);
1677 }
1678
1679 void ieee80211_sta_ps_deliver_uapsd(struct sta_info *sta)
1680 {
1681 int n_frames = sta->sta.max_sp;
1682 u8 delivery_enabled = sta->sta.uapsd_queues;
1683
1684 /*
1685 * If we ever grow support for TSPEC this might happen if
1686 * the TSPEC update from hostapd comes in between a trigger
1687 * frame setting WLAN_STA_UAPSD in the RX path and this
1688 * actually getting called.
1689 */
1690 if (!delivery_enabled)
1691 return;
1692
1693 switch (sta->sta.max_sp) {
1694 case 1:
1695 n_frames = 2;
1696 break;
1697 case 2:
1698 n_frames = 4;
1699 break;
1700 case 3:
1701 n_frames = 6;
1702 break;
1703 case 0:
1704 /* XXX: what is a good value? */
1705 n_frames = 128;
1706 break;
1707 }
1708
1709 ieee80211_sta_ps_deliver_response(sta, n_frames, ~delivery_enabled,
1710 IEEE80211_FRAME_RELEASE_UAPSD);
1711 }
1712
1713 void ieee80211_sta_block_awake(struct ieee80211_hw *hw,
1714 struct ieee80211_sta *pubsta, bool block)
1715 {
1716 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1717
1718 trace_api_sta_block_awake(sta->local, pubsta, block);
1719
1720 if (block) {
1721 set_sta_flag(sta, WLAN_STA_PS_DRIVER);
1722 ieee80211_clear_fast_xmit(sta);
1723 return;
1724 }
1725
1726 if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1727 return;
1728
1729 if (!test_sta_flag(sta, WLAN_STA_PS_STA)) {
1730 set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1731 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
1732 ieee80211_queue_work(hw, &sta->drv_deliver_wk);
1733 } else if (test_sta_flag(sta, WLAN_STA_PSPOLL) ||
1734 test_sta_flag(sta, WLAN_STA_UAPSD)) {
1735 /* must be asleep in this case */
1736 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
1737 ieee80211_queue_work(hw, &sta->drv_deliver_wk);
1738 } else {
1739 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
1740 ieee80211_check_fast_xmit(sta);
1741 }
1742 }
1743 EXPORT_SYMBOL(ieee80211_sta_block_awake);
1744
1745 void ieee80211_sta_eosp(struct ieee80211_sta *pubsta)
1746 {
1747 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1748 struct ieee80211_local *local = sta->local;
1749
1750 trace_api_eosp(local, pubsta);
1751
1752 clear_sta_flag(sta, WLAN_STA_SP);
1753 }
1754 EXPORT_SYMBOL(ieee80211_sta_eosp);
1755
1756 void ieee80211_send_eosp_nullfunc(struct ieee80211_sta *pubsta, int tid)
1757 {
1758 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1759 enum ieee80211_frame_release_type reason;
1760 bool more_data;
1761
1762 trace_api_send_eosp_nullfunc(sta->local, pubsta, tid);
1763
1764 reason = IEEE80211_FRAME_RELEASE_UAPSD;
1765 more_data = ieee80211_sta_ps_more_data(sta, ~sta->sta.uapsd_queues,
1766 reason, 0);
1767
1768 ieee80211_send_null_response(sta, tid, reason, false, more_data);
1769 }
1770 EXPORT_SYMBOL(ieee80211_send_eosp_nullfunc);
1771
1772 void ieee80211_sta_set_buffered(struct ieee80211_sta *pubsta,
1773 u8 tid, bool buffered)
1774 {
1775 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1776
1777 if (WARN_ON(tid >= IEEE80211_NUM_TIDS))
1778 return;
1779
1780 trace_api_sta_set_buffered(sta->local, pubsta, tid, buffered);
1781
1782 if (buffered)
1783 set_bit(tid, &sta->driver_buffered_tids);
1784 else
1785 clear_bit(tid, &sta->driver_buffered_tids);
1786
1787 sta_info_recalc_tim(sta);
1788 }
1789 EXPORT_SYMBOL(ieee80211_sta_set_buffered);
1790
1791 static void
1792 ieee80211_recalc_p2p_go_ps_allowed(struct ieee80211_sub_if_data *sdata)
1793 {
1794 struct ieee80211_local *local = sdata->local;
1795 bool allow_p2p_go_ps = sdata->vif.p2p;
1796 struct sta_info *sta;
1797
1798 rcu_read_lock();
1799 list_for_each_entry_rcu(sta, &local->sta_list, list) {
1800 if (sdata != sta->sdata ||
1801 !test_sta_flag(sta, WLAN_STA_ASSOC))
1802 continue;
1803 if (!sta->sta.support_p2p_ps) {
1804 allow_p2p_go_ps = false;
1805 break;
1806 }
1807 }
1808 rcu_read_unlock();
1809
1810 if (allow_p2p_go_ps != sdata->vif.bss_conf.allow_p2p_go_ps) {
1811 sdata->vif.bss_conf.allow_p2p_go_ps = allow_p2p_go_ps;
1812 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_P2P_PS);
1813 }
1814 }
1815
1816 int sta_info_move_state(struct sta_info *sta,
1817 enum ieee80211_sta_state new_state)
1818 {
1819 might_sleep();
1820
1821 if (sta->sta_state == new_state)
1822 return 0;
1823
1824 /* check allowed transitions first */
1825
1826 switch (new_state) {
1827 case IEEE80211_STA_NONE:
1828 if (sta->sta_state != IEEE80211_STA_AUTH)
1829 return -EINVAL;
1830 break;
1831 case IEEE80211_STA_AUTH:
1832 if (sta->sta_state != IEEE80211_STA_NONE &&
1833 sta->sta_state != IEEE80211_STA_ASSOC)
1834 return -EINVAL;
1835 break;
1836 case IEEE80211_STA_ASSOC:
1837 if (sta->sta_state != IEEE80211_STA_AUTH &&
1838 sta->sta_state != IEEE80211_STA_AUTHORIZED)
1839 return -EINVAL;
1840 break;
1841 case IEEE80211_STA_AUTHORIZED:
1842 if (sta->sta_state != IEEE80211_STA_ASSOC)
1843 return -EINVAL;
1844 break;
1845 default:
1846 WARN(1, "invalid state %d", new_state);
1847 return -EINVAL;
1848 }
1849
1850 sta_dbg(sta->sdata, "moving STA %pM to state %d\n",
1851 sta->sta.addr, new_state);
1852
1853 /*
1854 * notify the driver before the actual changes so it can
1855 * fail the transition
1856 */
1857 if (test_sta_flag(sta, WLAN_STA_INSERTED)) {
1858 int err = drv_sta_state(sta->local, sta->sdata, sta,
1859 sta->sta_state, new_state);
1860 if (err)
1861 return err;
1862 }
1863
1864 /* reflect the change in all state variables */
1865
1866 switch (new_state) {
1867 case IEEE80211_STA_NONE:
1868 if (sta->sta_state == IEEE80211_STA_AUTH)
1869 clear_bit(WLAN_STA_AUTH, &sta->_flags);
1870 break;
1871 case IEEE80211_STA_AUTH:
1872 if (sta->sta_state == IEEE80211_STA_NONE) {
1873 set_bit(WLAN_STA_AUTH, &sta->_flags);
1874 } else if (sta->sta_state == IEEE80211_STA_ASSOC) {
1875 clear_bit(WLAN_STA_ASSOC, &sta->_flags);
1876 ieee80211_recalc_min_chandef(sta->sdata);
1877 if (!sta->sta.support_p2p_ps)
1878 ieee80211_recalc_p2p_go_ps_allowed(sta->sdata);
1879 }
1880 break;
1881 case IEEE80211_STA_ASSOC:
1882 if (sta->sta_state == IEEE80211_STA_AUTH) {
1883 set_bit(WLAN_STA_ASSOC, &sta->_flags);
1884 ieee80211_recalc_min_chandef(sta->sdata);
1885 if (!sta->sta.support_p2p_ps)
1886 ieee80211_recalc_p2p_go_ps_allowed(sta->sdata);
1887 } else if (sta->sta_state == IEEE80211_STA_AUTHORIZED) {
1888 ieee80211_vif_dec_num_mcast(sta->sdata);
1889 clear_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
1890 ieee80211_clear_fast_xmit(sta);
1891 ieee80211_clear_fast_rx(sta);
1892 }
1893 break;
1894 case IEEE80211_STA_AUTHORIZED:
1895 if (sta->sta_state == IEEE80211_STA_ASSOC) {
1896 ieee80211_vif_inc_num_mcast(sta->sdata);
1897 set_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
1898 ieee80211_check_fast_xmit(sta);
1899 ieee80211_check_fast_rx(sta);
1900 }
1901 break;
1902 default:
1903 break;
1904 }
1905
1906 sta->sta_state = new_state;
1907
1908 return 0;
1909 }
1910
1911 u8 sta_info_tx_streams(struct sta_info *sta)
1912 {
1913 struct ieee80211_sta_ht_cap *ht_cap = &sta->sta.ht_cap;
1914 u8 rx_streams;
1915
1916 if (!sta->sta.ht_cap.ht_supported)
1917 return 1;
1918
1919 if (sta->sta.vht_cap.vht_supported) {
1920 int i;
1921 u16 tx_mcs_map =
1922 le16_to_cpu(sta->sta.vht_cap.vht_mcs.tx_mcs_map);
1923
1924 for (i = 7; i >= 0; i--)
1925 if ((tx_mcs_map & (0x3 << (i * 2))) !=
1926 IEEE80211_VHT_MCS_NOT_SUPPORTED)
1927 return i + 1;
1928 }
1929
1930 if (ht_cap->mcs.rx_mask[3])
1931 rx_streams = 4;
1932 else if (ht_cap->mcs.rx_mask[2])
1933 rx_streams = 3;
1934 else if (ht_cap->mcs.rx_mask[1])
1935 rx_streams = 2;
1936 else
1937 rx_streams = 1;
1938
1939 if (!(ht_cap->mcs.tx_params & IEEE80211_HT_MCS_TX_RX_DIFF))
1940 return rx_streams;
1941
1942 return ((ht_cap->mcs.tx_params & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
1943 >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1;
1944 }
1945
1946 static struct ieee80211_sta_rx_stats *
1947 sta_get_last_rx_stats(struct sta_info *sta)
1948 {
1949 struct ieee80211_sta_rx_stats *stats = &sta->rx_stats;
1950 struct ieee80211_local *local = sta->local;
1951 int cpu;
1952
1953 if (!ieee80211_hw_check(&local->hw, USES_RSS))
1954 return stats;
1955
1956 for_each_possible_cpu(cpu) {
1957 struct ieee80211_sta_rx_stats *cpustats;
1958
1959 cpustats = per_cpu_ptr(sta->pcpu_rx_stats, cpu);
1960
1961 if (time_after(cpustats->last_rx, stats->last_rx))
1962 stats = cpustats;
1963 }
1964
1965 return stats;
1966 }
1967
1968 static void sta_stats_decode_rate(struct ieee80211_local *local, u16 rate,
1969 struct rate_info *rinfo)
1970 {
1971 rinfo->bw = STA_STATS_GET(BW, rate);
1972
1973 switch (STA_STATS_GET(TYPE, rate)) {
1974 case STA_STATS_RATE_TYPE_VHT:
1975 rinfo->flags = RATE_INFO_FLAGS_VHT_MCS;
1976 rinfo->mcs = STA_STATS_GET(VHT_MCS, rate);
1977 rinfo->nss = STA_STATS_GET(VHT_NSS, rate);
1978 if (STA_STATS_GET(SGI, rate))
1979 rinfo->flags |= RATE_INFO_FLAGS_SHORT_GI;
1980 break;
1981 case STA_STATS_RATE_TYPE_HT:
1982 rinfo->flags = RATE_INFO_FLAGS_MCS;
1983 rinfo->mcs = STA_STATS_GET(HT_MCS, rate);
1984 if (STA_STATS_GET(SGI, rate))
1985 rinfo->flags |= RATE_INFO_FLAGS_SHORT_GI;
1986 break;
1987 case STA_STATS_RATE_TYPE_LEGACY: {
1988 struct ieee80211_supported_band *sband;
1989 u16 brate;
1990 unsigned int shift;
1991 int band = STA_STATS_GET(LEGACY_BAND, rate);
1992 int rate_idx = STA_STATS_GET(LEGACY_IDX, rate);
1993
1994 rinfo->flags = 0;
1995 sband = local->hw.wiphy->bands[band];
1996 brate = sband->bitrates[rate_idx].bitrate;
1997 if (rinfo->bw == RATE_INFO_BW_5)
1998 shift = 2;
1999 else if (rinfo->bw == RATE_INFO_BW_10)
2000 shift = 1;
2001 else
2002 shift = 0;
2003 rinfo->legacy = DIV_ROUND_UP(brate, 1 << shift);
2004 break;
2005 }
2006 }
2007 }
2008
2009 static int sta_set_rate_info_rx(struct sta_info *sta, struct rate_info *rinfo)
2010 {
2011 u16 rate = ACCESS_ONCE(sta_get_last_rx_stats(sta)->last_rate);
2012
2013 if (rate == STA_STATS_RATE_INVALID)
2014 return -EINVAL;
2015
2016 sta_stats_decode_rate(sta->local, rate, rinfo);
2017 return 0;
2018 }
2019
2020 static void sta_set_tidstats(struct sta_info *sta,
2021 struct cfg80211_tid_stats *tidstats,
2022 int tid)
2023 {
2024 struct ieee80211_local *local = sta->local;
2025
2026 if (!(tidstats->filled & BIT(NL80211_TID_STATS_RX_MSDU))) {
2027 unsigned int start;
2028
2029 do {
2030 start = u64_stats_fetch_begin(&sta->rx_stats.syncp);
2031 tidstats->rx_msdu = sta->rx_stats.msdu[tid];
2032 } while (u64_stats_fetch_retry(&sta->rx_stats.syncp, start));
2033
2034 tidstats->filled |= BIT(NL80211_TID_STATS_RX_MSDU);
2035 }
2036
2037 if (!(tidstats->filled & BIT(NL80211_TID_STATS_TX_MSDU))) {
2038 tidstats->filled |= BIT(NL80211_TID_STATS_TX_MSDU);
2039 tidstats->tx_msdu = sta->tx_stats.msdu[tid];
2040 }
2041
2042 if (!(tidstats->filled & BIT(NL80211_TID_STATS_TX_MSDU_RETRIES)) &&
2043 ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
2044 tidstats->filled |= BIT(NL80211_TID_STATS_TX_MSDU_RETRIES);
2045 tidstats->tx_msdu_retries = sta->status_stats.msdu_retries[tid];
2046 }
2047
2048 if (!(tidstats->filled & BIT(NL80211_TID_STATS_TX_MSDU_FAILED)) &&
2049 ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
2050 tidstats->filled |= BIT(NL80211_TID_STATS_TX_MSDU_FAILED);
2051 tidstats->tx_msdu_failed = sta->status_stats.msdu_failed[tid];
2052 }
2053 }
2054
2055 static inline u64 sta_get_stats_bytes(struct ieee80211_sta_rx_stats *rxstats)
2056 {
2057 unsigned int start;
2058 u64 value;
2059
2060 do {
2061 start = u64_stats_fetch_begin(&rxstats->syncp);
2062 value = rxstats->bytes;
2063 } while (u64_stats_fetch_retry(&rxstats->syncp, start));
2064
2065 return value;
2066 }
2067
2068 void sta_set_sinfo(struct sta_info *sta, struct station_info *sinfo)
2069 {
2070 struct ieee80211_sub_if_data *sdata = sta->sdata;
2071 struct ieee80211_local *local = sdata->local;
2072 u32 thr = 0;
2073 int i, ac, cpu;
2074 struct ieee80211_sta_rx_stats *last_rxstats;
2075
2076 last_rxstats = sta_get_last_rx_stats(sta);
2077
2078 sinfo->generation = sdata->local->sta_generation;
2079
2080 /* do before driver, so beacon filtering drivers have a
2081 * chance to e.g. just add the number of filtered beacons
2082 * (or just modify the value entirely, of course)
2083 */
2084 if (sdata->vif.type == NL80211_IFTYPE_STATION)
2085 sinfo->rx_beacon = sdata->u.mgd.count_beacon_signal;
2086
2087 drv_sta_statistics(local, sdata, &sta->sta, sinfo);
2088
2089 sinfo->filled |= BIT(NL80211_STA_INFO_INACTIVE_TIME) |
2090 BIT(NL80211_STA_INFO_STA_FLAGS) |
2091 BIT(NL80211_STA_INFO_BSS_PARAM) |
2092 BIT(NL80211_STA_INFO_CONNECTED_TIME) |
2093 BIT(NL80211_STA_INFO_RX_DROP_MISC);
2094
2095 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2096 sinfo->beacon_loss_count = sdata->u.mgd.beacon_loss_count;
2097 sinfo->filled |= BIT(NL80211_STA_INFO_BEACON_LOSS);
2098 }
2099
2100 sinfo->connected_time = ktime_get_seconds() - sta->last_connected;
2101 sinfo->inactive_time =
2102 jiffies_to_msecs(jiffies - ieee80211_sta_last_active(sta));
2103
2104 if (!(sinfo->filled & (BIT(NL80211_STA_INFO_TX_BYTES64) |
2105 BIT(NL80211_STA_INFO_TX_BYTES)))) {
2106 sinfo->tx_bytes = 0;
2107 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
2108 sinfo->tx_bytes += sta->tx_stats.bytes[ac];
2109 sinfo->filled |= BIT(NL80211_STA_INFO_TX_BYTES64);
2110 }
2111
2112 if (!(sinfo->filled & BIT(NL80211_STA_INFO_TX_PACKETS))) {
2113 sinfo->tx_packets = 0;
2114 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
2115 sinfo->tx_packets += sta->tx_stats.packets[ac];
2116 sinfo->filled |= BIT(NL80211_STA_INFO_TX_PACKETS);
2117 }
2118
2119 if (!(sinfo->filled & (BIT(NL80211_STA_INFO_RX_BYTES64) |
2120 BIT(NL80211_STA_INFO_RX_BYTES)))) {
2121 sinfo->rx_bytes += sta_get_stats_bytes(&sta->rx_stats);
2122
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_bytes += sta_get_stats_bytes(cpurxs);
2129 }
2130 }
2131
2132 sinfo->filled |= BIT(NL80211_STA_INFO_RX_BYTES64);
2133 }
2134
2135 if (!(sinfo->filled & BIT(NL80211_STA_INFO_RX_PACKETS))) {
2136 sinfo->rx_packets = sta->rx_stats.packets;
2137 if (sta->pcpu_rx_stats) {
2138 for_each_possible_cpu(cpu) {
2139 struct ieee80211_sta_rx_stats *cpurxs;
2140
2141 cpurxs = per_cpu_ptr(sta->pcpu_rx_stats, cpu);
2142 sinfo->rx_packets += cpurxs->packets;
2143 }
2144 }
2145 sinfo->filled |= BIT(NL80211_STA_INFO_RX_PACKETS);
2146 }
2147
2148 if (!(sinfo->filled & BIT(NL80211_STA_INFO_TX_RETRIES))) {
2149 sinfo->tx_retries = sta->status_stats.retry_count;
2150 sinfo->filled |= BIT(NL80211_STA_INFO_TX_RETRIES);
2151 }
2152
2153 if (!(sinfo->filled & BIT(NL80211_STA_INFO_TX_FAILED))) {
2154 sinfo->tx_failed = sta->status_stats.retry_failed;
2155 sinfo->filled |= BIT(NL80211_STA_INFO_TX_FAILED);
2156 }
2157
2158 sinfo->rx_dropped_misc = sta->rx_stats.dropped;
2159 if (sta->pcpu_rx_stats) {
2160 for_each_possible_cpu(cpu) {
2161 struct ieee80211_sta_rx_stats *cpurxs;
2162
2163 cpurxs = per_cpu_ptr(sta->pcpu_rx_stats, cpu);
2164 sinfo->rx_dropped_misc += cpurxs->dropped;
2165 }
2166 }
2167
2168 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2169 !(sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)) {
2170 sinfo->filled |= BIT(NL80211_STA_INFO_BEACON_RX) |
2171 BIT(NL80211_STA_INFO_BEACON_SIGNAL_AVG);
2172 sinfo->rx_beacon_signal_avg = ieee80211_ave_rssi(&sdata->vif);
2173 }
2174
2175 if (ieee80211_hw_check(&sta->local->hw, SIGNAL_DBM) ||
2176 ieee80211_hw_check(&sta->local->hw, SIGNAL_UNSPEC)) {
2177 if (!(sinfo->filled & BIT(NL80211_STA_INFO_SIGNAL))) {
2178 sinfo->signal = (s8)last_rxstats->last_signal;
2179 sinfo->filled |= BIT(NL80211_STA_INFO_SIGNAL);
2180 }
2181
2182 if (!sta->pcpu_rx_stats &&
2183 !(sinfo->filled & BIT(NL80211_STA_INFO_SIGNAL_AVG))) {
2184 sinfo->signal_avg =
2185 -ewma_signal_read(&sta->rx_stats_avg.signal);
2186 sinfo->filled |= BIT(NL80211_STA_INFO_SIGNAL_AVG);
2187 }
2188 }
2189
2190 /* for the average - if pcpu_rx_stats isn't set - rxstats must point to
2191 * the sta->rx_stats struct, so the check here is fine with and without
2192 * pcpu statistics
2193 */
2194 if (last_rxstats->chains &&
2195 !(sinfo->filled & (BIT(NL80211_STA_INFO_CHAIN_SIGNAL) |
2196 BIT(NL80211_STA_INFO_CHAIN_SIGNAL_AVG)))) {
2197 sinfo->filled |= BIT(NL80211_STA_INFO_CHAIN_SIGNAL);
2198 if (!sta->pcpu_rx_stats)
2199 sinfo->filled |= BIT(NL80211_STA_INFO_CHAIN_SIGNAL_AVG);
2200
2201 sinfo->chains = last_rxstats->chains;
2202
2203 for (i = 0; i < ARRAY_SIZE(sinfo->chain_signal); i++) {
2204 sinfo->chain_signal[i] =
2205 last_rxstats->chain_signal_last[i];
2206 sinfo->chain_signal_avg[i] =
2207 -ewma_signal_read(&sta->rx_stats_avg.chain_signal[i]);
2208 }
2209 }
2210
2211 if (!(sinfo->filled & BIT(NL80211_STA_INFO_TX_BITRATE))) {
2212 sta_set_rate_info_tx(sta, &sta->tx_stats.last_rate,
2213 &sinfo->txrate);
2214 sinfo->filled |= BIT(NL80211_STA_INFO_TX_BITRATE);
2215 }
2216
2217 if (!(sinfo->filled & BIT(NL80211_STA_INFO_RX_BITRATE))) {
2218 if (sta_set_rate_info_rx(sta, &sinfo->rxrate) == 0)
2219 sinfo->filled |= BIT(NL80211_STA_INFO_RX_BITRATE);
2220 }
2221
2222 sinfo->filled |= BIT(NL80211_STA_INFO_TID_STATS);
2223 for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) {
2224 struct cfg80211_tid_stats *tidstats = &sinfo->pertid[i];
2225
2226 sta_set_tidstats(sta, tidstats, i);
2227 }
2228
2229 if (ieee80211_vif_is_mesh(&sdata->vif)) {
2230 #ifdef CONFIG_MAC80211_MESH
2231 sinfo->filled |= BIT(NL80211_STA_INFO_LLID) |
2232 BIT(NL80211_STA_INFO_PLID) |
2233 BIT(NL80211_STA_INFO_PLINK_STATE) |
2234 BIT(NL80211_STA_INFO_LOCAL_PM) |
2235 BIT(NL80211_STA_INFO_PEER_PM) |
2236 BIT(NL80211_STA_INFO_NONPEER_PM);
2237
2238 sinfo->llid = sta->mesh->llid;
2239 sinfo->plid = sta->mesh->plid;
2240 sinfo->plink_state = sta->mesh->plink_state;
2241 if (test_sta_flag(sta, WLAN_STA_TOFFSET_KNOWN)) {
2242 sinfo->filled |= BIT(NL80211_STA_INFO_T_OFFSET);
2243 sinfo->t_offset = sta->mesh->t_offset;
2244 }
2245 sinfo->local_pm = sta->mesh->local_pm;
2246 sinfo->peer_pm = sta->mesh->peer_pm;
2247 sinfo->nonpeer_pm = sta->mesh->nonpeer_pm;
2248 #endif
2249 }
2250
2251 sinfo->bss_param.flags = 0;
2252 if (sdata->vif.bss_conf.use_cts_prot)
2253 sinfo->bss_param.flags |= BSS_PARAM_FLAGS_CTS_PROT;
2254 if (sdata->vif.bss_conf.use_short_preamble)
2255 sinfo->bss_param.flags |= BSS_PARAM_FLAGS_SHORT_PREAMBLE;
2256 if (sdata->vif.bss_conf.use_short_slot)
2257 sinfo->bss_param.flags |= BSS_PARAM_FLAGS_SHORT_SLOT_TIME;
2258 sinfo->bss_param.dtim_period = sdata->vif.bss_conf.dtim_period;
2259 sinfo->bss_param.beacon_interval = sdata->vif.bss_conf.beacon_int;
2260
2261 sinfo->sta_flags.set = 0;
2262 sinfo->sta_flags.mask = BIT(NL80211_STA_FLAG_AUTHORIZED) |
2263 BIT(NL80211_STA_FLAG_SHORT_PREAMBLE) |
2264 BIT(NL80211_STA_FLAG_WME) |
2265 BIT(NL80211_STA_FLAG_MFP) |
2266 BIT(NL80211_STA_FLAG_AUTHENTICATED) |
2267 BIT(NL80211_STA_FLAG_ASSOCIATED) |
2268 BIT(NL80211_STA_FLAG_TDLS_PEER);
2269 if (test_sta_flag(sta, WLAN_STA_AUTHORIZED))
2270 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_AUTHORIZED);
2271 if (test_sta_flag(sta, WLAN_STA_SHORT_PREAMBLE))
2272 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_SHORT_PREAMBLE);
2273 if (sta->sta.wme)
2274 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_WME);
2275 if (test_sta_flag(sta, WLAN_STA_MFP))
2276 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_MFP);
2277 if (test_sta_flag(sta, WLAN_STA_AUTH))
2278 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_AUTHENTICATED);
2279 if (test_sta_flag(sta, WLAN_STA_ASSOC))
2280 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_ASSOCIATED);
2281 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER))
2282 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_TDLS_PEER);
2283
2284 thr = sta_get_expected_throughput(sta);
2285
2286 if (thr != 0) {
2287 sinfo->filled |= BIT(NL80211_STA_INFO_EXPECTED_THROUGHPUT);
2288 sinfo->expected_throughput = thr;
2289 }
2290 }
2291
2292 u32 sta_get_expected_throughput(struct sta_info *sta)
2293 {
2294 struct ieee80211_sub_if_data *sdata = sta->sdata;
2295 struct ieee80211_local *local = sdata->local;
2296 struct rate_control_ref *ref = NULL;
2297 u32 thr = 0;
2298
2299 if (test_sta_flag(sta, WLAN_STA_RATE_CONTROL))
2300 ref = local->rate_ctrl;
2301
2302 /* check if the driver has a SW RC implementation */
2303 if (ref && ref->ops->get_expected_throughput)
2304 thr = ref->ops->get_expected_throughput(sta->rate_ctrl_priv);
2305 else
2306 thr = drv_get_expected_throughput(local, sta);
2307
2308 return thr;
2309 }
2310
2311 unsigned long ieee80211_sta_last_active(struct sta_info *sta)
2312 {
2313 struct ieee80211_sta_rx_stats *stats = sta_get_last_rx_stats(sta);
2314
2315 if (time_after(stats->last_rx, sta->status_stats.last_ack))
2316 return stats->last_rx;
2317 return sta->status_stats.last_ack;
2318 }
2319
2320 static void sta_update_codel_params(struct sta_info *sta, u32 thr)
2321 {
2322 if (!sta->sdata->local->ops->wake_tx_queue)
2323 return;
2324
2325 if (thr && thr < STA_SLOW_THRESHOLD * sta->local->num_sta) {
2326 sta->cparams.target = MS2TIME(50);
2327 sta->cparams.interval = MS2TIME(300);
2328 sta->cparams.ecn = false;
2329 } else {
2330 sta->cparams.target = MS2TIME(20);
2331 sta->cparams.interval = MS2TIME(100);
2332 sta->cparams.ecn = true;
2333 }
2334 }
2335
2336 void ieee80211_sta_set_expected_throughput(struct ieee80211_sta *pubsta,
2337 u32 thr)
2338 {
2339 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
2340
2341 sta_update_codel_params(sta, thr);
2342 }
Linux with added FPC-III support