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netfilter: flowtables: use fixed renew timeout on teardown
[linux/fpc-iii.git] / net / mac80211 / sta_info.c
blobf34202242d24d074f5cca49c7b4b7a101114f73b
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 * Copyright (C) 2018 Intel Corporation
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/etherdevice.h>
16 #include <linux/netdevice.h>
17 #include <linux/types.h>
18 #include <linux/slab.h>
19 #include <linux/skbuff.h>
20 #include <linux/if_arp.h>
21 #include <linux/timer.h>
22 #include <linux/rtnetlink.h>
23
24 #include <net/codel.h>
25 #include <net/mac80211.h>
26 #include "ieee80211_i.h"
27 #include "driver-ops.h"
28 #include "rate.h"
29 #include "sta_info.h"
30 #include "debugfs_sta.h"
31 #include "mesh.h"
32 #include "wme.h"
33
34 /**
35 * DOC: STA information lifetime rules
36 *
37 * STA info structures (&struct sta_info) are managed in a hash table
38 * for faster lookup and a list for iteration. They are managed using
39 * RCU, i.e. access to the list and hash table is protected by RCU.
40 *
41 * Upon allocating a STA info structure with sta_info_alloc(), the caller
42 * owns that structure. It must then insert it into the hash table using
43 * either sta_info_insert() or sta_info_insert_rcu(); only in the latter
44 * case (which acquires an rcu read section but must not be called from
45 * within one) will the pointer still be valid after the call. Note that
46 * the caller may not do much with the STA info before inserting it, in
47 * particular, it may not start any mesh peer link management or add
48 * encryption keys.
49 *
50 * When the insertion fails (sta_info_insert()) returns non-zero), the
51 * structure will have been freed by sta_info_insert()!
52 *
53 * Station entries are added by mac80211 when you establish a link with a
54 * peer. This means different things for the different type of interfaces
55 * we support. For a regular station this mean we add the AP sta when we
56 * receive an association response from the AP. For IBSS this occurs when
57 * get to know about a peer on the same IBSS. For WDS we add the sta for
58 * the peer immediately upon device open. When using AP mode we add stations
59 * for each respective station upon request from userspace through nl80211.
60 *
61 * In order to remove a STA info structure, various sta_info_destroy_*()
62 * calls are available.
63 *
64 * There is no concept of ownership on a STA entry, each structure is
65 * owned by the global hash table/list until it is removed. All users of
66 * the structure need to be RCU protected so that the structure won't be
67 * freed before they are done using it.
68 */
69
70 static const struct rhashtable_params sta_rht_params = {
71 .nelem_hint = 3, /* start small */
72 .automatic_shrinking = true,
73 .head_offset = offsetof(struct sta_info, hash_node),
74 .key_offset = offsetof(struct sta_info, addr),
75 .key_len = ETH_ALEN,
76 .max_size = CONFIG_MAC80211_STA_HASH_MAX_SIZE,
77 };
78
79 /* Caller must hold local->sta_mtx */
80 static int sta_info_hash_del(struct ieee80211_local *local,
81 struct sta_info *sta)
82 {
83 return rhltable_remove(&local->sta_hash, &sta->hash_node,
84 sta_rht_params);
85 }
86
87 static void __cleanup_single_sta(struct sta_info *sta)
88 {
89 int ac, i;
90 struct tid_ampdu_tx *tid_tx;
91 struct ieee80211_sub_if_data *sdata = sta->sdata;
92 struct ieee80211_local *local = sdata->local;
93 struct fq *fq = &local->fq;
94 struct ps_data *ps;
95
96 if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
97 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
98 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) {
99 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
100 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
101 ps = &sdata->bss->ps;
102 else if (ieee80211_vif_is_mesh(&sdata->vif))
103 ps = &sdata->u.mesh.ps;
104 else
105 return;
106
107 clear_sta_flag(sta, WLAN_STA_PS_STA);
108 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
109 clear_sta_flag(sta, WLAN_STA_PS_DELIVER);
110
111 atomic_dec(&ps->num_sta_ps);
112 }
113
114 if (sta->sta.txq[0]) {
115 for (i = 0; i < ARRAY_SIZE(sta->sta.txq); i++) {
116 struct txq_info *txqi = to_txq_info(sta->sta.txq[i]);
117
118 spin_lock_bh(&fq->lock);
119 ieee80211_txq_purge(local, txqi);
120 spin_unlock_bh(&fq->lock);
121 }
122 }
123
124 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
125 local->total_ps_buffered -= skb_queue_len(&sta->ps_tx_buf[ac]);
126 ieee80211_purge_tx_queue(&local->hw, &sta->ps_tx_buf[ac]);
127 ieee80211_purge_tx_queue(&local->hw, &sta->tx_filtered[ac]);
128 }
129
130 if (ieee80211_vif_is_mesh(&sdata->vif))
131 mesh_sta_cleanup(sta);
132
133 cancel_work_sync(&sta->drv_deliver_wk);
134
135 /*
136 * Destroy aggregation state here. It would be nice to wait for the
137 * driver to finish aggregation stop and then clean up, but for now
138 * drivers have to handle aggregation stop being requested, followed
139 * directly by station destruction.
140 */
141 for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
142 kfree(sta->ampdu_mlme.tid_start_tx[i]);
143 tid_tx = rcu_dereference_raw(sta->ampdu_mlme.tid_tx[i]);
144 if (!tid_tx)
145 continue;
146 ieee80211_purge_tx_queue(&local->hw, &tid_tx->pending);
147 kfree(tid_tx);
148 }
149 }
150
151 static void cleanup_single_sta(struct sta_info *sta)
152 {
153 struct ieee80211_sub_if_data *sdata = sta->sdata;
154 struct ieee80211_local *local = sdata->local;
155
156 __cleanup_single_sta(sta);
157 sta_info_free(local, sta);
158 }
159
160 struct rhlist_head *sta_info_hash_lookup(struct ieee80211_local *local,
161 const u8 *addr)
162 {
163 return rhltable_lookup(&local->sta_hash, addr, sta_rht_params);
164 }
165
166 /* protected by RCU */
167 struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata,
168 const u8 *addr)
169 {
170 struct ieee80211_local *local = sdata->local;
171 struct rhlist_head *tmp;
172 struct sta_info *sta;
173
174 rcu_read_lock();
175 for_each_sta_info(local, addr, sta, tmp) {
176 if (sta->sdata == sdata) {
177 rcu_read_unlock();
178 /* this is safe as the caller must already hold
179 * another rcu read section or the mutex
180 */
181 return sta;
182 }
183 }
184 rcu_read_unlock();
185 return NULL;
186 }
187
188 /*
189 * Get sta info either from the specified interface
190 * or from one of its vlans
191 */
192 struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata,
193 const u8 *addr)
194 {
195 struct ieee80211_local *local = sdata->local;
196 struct rhlist_head *tmp;
197 struct sta_info *sta;
198
199 rcu_read_lock();
200 for_each_sta_info(local, addr, sta, tmp) {
201 if (sta->sdata == sdata ||
202 (sta->sdata->bss && sta->sdata->bss == sdata->bss)) {
203 rcu_read_unlock();
204 /* this is safe as the caller must already hold
205 * another rcu read section or the mutex
206 */
207 return sta;
208 }
209 }
210 rcu_read_unlock();
211 return NULL;
212 }
213
214 struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
215 int idx)
216 {
217 struct ieee80211_local *local = sdata->local;
218 struct sta_info *sta;
219 int i = 0;
220
221 list_for_each_entry_rcu(sta, &local->sta_list, list) {
222 if (sdata != sta->sdata)
223 continue;
224 if (i < idx) {
225 ++i;
226 continue;
227 }
228 return sta;
229 }
230
231 return NULL;
232 }
233
234 /**
235 * sta_info_free - free STA
236 *
237 * @local: pointer to the global information
238 * @sta: STA info to free
239 *
240 * This function must undo everything done by sta_info_alloc()
241 * that may happen before sta_info_insert(). It may only be
242 * called when sta_info_insert() has not been attempted (and
243 * if that fails, the station is freed anyway.)
244 */
245 void sta_info_free(struct ieee80211_local *local, struct sta_info *sta)
246 {
247 if (sta->rate_ctrl)
248 rate_control_free_sta(sta);
249
250 sta_dbg(sta->sdata, "Destroyed STA %pM\n", sta->sta.addr);
251
252 if (sta->sta.txq[0])
253 kfree(to_txq_info(sta->sta.txq[0]));
254 kfree(rcu_dereference_raw(sta->sta.rates));
255 #ifdef CONFIG_MAC80211_MESH
256 kfree(sta->mesh);
257 #endif
258 free_percpu(sta->pcpu_rx_stats);
259 kfree(sta);
260 }
261
262 /* Caller must hold local->sta_mtx */
263 static int sta_info_hash_add(struct ieee80211_local *local,
264 struct sta_info *sta)
265 {
266 return rhltable_insert(&local->sta_hash, &sta->hash_node,
267 sta_rht_params);
268 }
269
270 static void sta_deliver_ps_frames(struct work_struct *wk)
271 {
272 struct sta_info *sta;
273
274 sta = container_of(wk, struct sta_info, drv_deliver_wk);
275
276 if (sta->dead)
277 return;
278
279 local_bh_disable();
280 if (!test_sta_flag(sta, WLAN_STA_PS_STA))
281 ieee80211_sta_ps_deliver_wakeup(sta);
282 else if (test_and_clear_sta_flag(sta, WLAN_STA_PSPOLL))
283 ieee80211_sta_ps_deliver_poll_response(sta);
284 else if (test_and_clear_sta_flag(sta, WLAN_STA_UAPSD))
285 ieee80211_sta_ps_deliver_uapsd(sta);
286 local_bh_enable();
287 }
288
289 static int sta_prepare_rate_control(struct ieee80211_local *local,
290 struct sta_info *sta, gfp_t gfp)
291 {
292 if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL))
293 return 0;
294
295 sta->rate_ctrl = local->rate_ctrl;
296 sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl,
297 sta, gfp);
298 if (!sta->rate_ctrl_priv)
299 return -ENOMEM;
300
301 return 0;
302 }
303
304 struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
305 const u8 *addr, gfp_t gfp)
306 {
307 struct ieee80211_local *local = sdata->local;
308 struct ieee80211_hw *hw = &local->hw;
309 struct sta_info *sta;
310 int i;
311
312 sta = kzalloc(sizeof(*sta) + hw->sta_data_size, gfp);
313 if (!sta)
314 return NULL;
315
316 if (ieee80211_hw_check(hw, USES_RSS)) {
317 sta->pcpu_rx_stats =
318 alloc_percpu_gfp(struct ieee80211_sta_rx_stats, gfp);
319 if (!sta->pcpu_rx_stats)
320 goto free;
321 }
322
323 spin_lock_init(&sta->lock);
324 spin_lock_init(&sta->ps_lock);
325 INIT_WORK(&sta->drv_deliver_wk, sta_deliver_ps_frames);
326 INIT_WORK(&sta->ampdu_mlme.work, ieee80211_ba_session_work);
327 mutex_init(&sta->ampdu_mlme.mtx);
328 #ifdef CONFIG_MAC80211_MESH
329 if (ieee80211_vif_is_mesh(&sdata->vif)) {
330 sta->mesh = kzalloc(sizeof(*sta->mesh), gfp);
331 if (!sta->mesh)
332 goto free;
333 sta->mesh->plink_sta = sta;
334 spin_lock_init(&sta->mesh->plink_lock);
335 if (ieee80211_vif_is_mesh(&sdata->vif) &&
336 !sdata->u.mesh.user_mpm)
337 timer_setup(&sta->mesh->plink_timer, mesh_plink_timer,
338 0);
339 sta->mesh->nonpeer_pm = NL80211_MESH_POWER_ACTIVE;
340 }
341 #endif
342
343 memcpy(sta->addr, addr, ETH_ALEN);
344 memcpy(sta->sta.addr, addr, ETH_ALEN);
345 sta->sta.max_rx_aggregation_subframes =
346 local->hw.max_rx_aggregation_subframes;
347
348 sta->local = local;
349 sta->sdata = sdata;
350 sta->rx_stats.last_rx = jiffies;
351
352 u64_stats_init(&sta->rx_stats.syncp);
353
354 sta->sta_state = IEEE80211_STA_NONE;
355
356 /* Mark TID as unreserved */
357 sta->reserved_tid = IEEE80211_TID_UNRESERVED;
358
359 sta->last_connected = ktime_get_seconds();
360 ewma_signal_init(&sta->rx_stats_avg.signal);
361 ewma_avg_signal_init(&sta->status_stats.avg_ack_signal);
362 for (i = 0; i < ARRAY_SIZE(sta->rx_stats_avg.chain_signal); i++)
363 ewma_signal_init(&sta->rx_stats_avg.chain_signal[i]);
364
365 if (local->ops->wake_tx_queue) {
366 void *txq_data;
367 int size = sizeof(struct txq_info) +
368 ALIGN(hw->txq_data_size, sizeof(void *));
369
370 txq_data = kcalloc(ARRAY_SIZE(sta->sta.txq), size, gfp);
371 if (!txq_data)
372 goto free;
373
374 for (i = 0; i < ARRAY_SIZE(sta->sta.txq); i++) {
375 struct txq_info *txq = txq_data + i * size;
376
377 ieee80211_txq_init(sdata, sta, txq, i);
378 }
379 }
380
381 if (sta_prepare_rate_control(local, sta, gfp))
382 goto free_txq;
383
384 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
385 skb_queue_head_init(&sta->ps_tx_buf[i]);
386 skb_queue_head_init(&sta->tx_filtered[i]);
387 }
388
389 for (i = 0; i < IEEE80211_NUM_TIDS; i++)
390 sta->last_seq_ctrl[i] = cpu_to_le16(USHRT_MAX);
391
392 sta->sta.smps_mode = IEEE80211_SMPS_OFF;
393 if (sdata->vif.type == NL80211_IFTYPE_AP ||
394 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
395 struct ieee80211_supported_band *sband;
396 u8 smps;
397
398 sband = ieee80211_get_sband(sdata);
399 if (!sband)
400 goto free_txq;
401
402 smps = (sband->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >>
403 IEEE80211_HT_CAP_SM_PS_SHIFT;
404 /*
405 * Assume that hostapd advertises our caps in the beacon and
406 * this is the known_smps_mode for a station that just assciated
407 */
408 switch (smps) {
409 case WLAN_HT_SMPS_CONTROL_DISABLED:
410 sta->known_smps_mode = IEEE80211_SMPS_OFF;
411 break;
412 case WLAN_HT_SMPS_CONTROL_STATIC:
413 sta->known_smps_mode = IEEE80211_SMPS_STATIC;
414 break;
415 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
416 sta->known_smps_mode = IEEE80211_SMPS_DYNAMIC;
417 break;
418 default:
419 WARN_ON(1);
420 }
421 }
422
423 sta->sta.max_rc_amsdu_len = IEEE80211_MAX_MPDU_LEN_HT_BA;
424
425 sta->cparams.ce_threshold = CODEL_DISABLED_THRESHOLD;
426 sta->cparams.target = MS2TIME(20);
427 sta->cparams.interval = MS2TIME(100);
428 sta->cparams.ecn = true;
429
430 sta_dbg(sdata, "Allocated STA %pM\n", sta->sta.addr);
431
432 return sta;
433
434 free_txq:
435 if (sta->sta.txq[0])
436 kfree(to_txq_info(sta->sta.txq[0]));
437 free:
438 free_percpu(sta->pcpu_rx_stats);
439 #ifdef CONFIG_MAC80211_MESH
440 kfree(sta->mesh);
441 #endif
442 kfree(sta);
443 return NULL;
444 }
445
446 static int sta_info_insert_check(struct sta_info *sta)
447 {
448 struct ieee80211_sub_if_data *sdata = sta->sdata;
449
450 /*
451 * Can't be a WARN_ON because it can be triggered through a race:
452 * something inserts a STA (on one CPU) without holding the RTNL
453 * and another CPU turns off the net device.
454 */
455 if (unlikely(!ieee80211_sdata_running(sdata)))
456 return -ENETDOWN;
457
458 if (WARN_ON(ether_addr_equal(sta->sta.addr, sdata->vif.addr) ||
459 is_multicast_ether_addr(sta->sta.addr)))
460 return -EINVAL;
461
462 /* The RCU read lock is required by rhashtable due to
463 * asynchronous resize/rehash. We also require the mutex
464 * for correctness.
465 */
466 rcu_read_lock();
467 lockdep_assert_held(&sdata->local->sta_mtx);
468 if (ieee80211_hw_check(&sdata->local->hw, NEEDS_UNIQUE_STA_ADDR) &&
469 ieee80211_find_sta_by_ifaddr(&sdata->local->hw, sta->addr, NULL)) {
470 rcu_read_unlock();
471 return -ENOTUNIQ;
472 }
473 rcu_read_unlock();
474
475 return 0;
476 }
477
478 static int sta_info_insert_drv_state(struct ieee80211_local *local,
479 struct ieee80211_sub_if_data *sdata,
480 struct sta_info *sta)
481 {
482 enum ieee80211_sta_state state;
483 int err = 0;
484
485 for (state = IEEE80211_STA_NOTEXIST; state < sta->sta_state; state++) {
486 err = drv_sta_state(local, sdata, sta, state, state + 1);
487 if (err)
488 break;
489 }
490
491 if (!err) {
492 /*
493 * Drivers using legacy sta_add/sta_remove callbacks only
494 * get uploaded set to true after sta_add is called.
495 */
496 if (!local->ops->sta_add)
497 sta->uploaded = true;
498 return 0;
499 }
500
501 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
502 sdata_info(sdata,
503 "failed to move IBSS STA %pM to state %d (%d) - keeping it anyway\n",
504 sta->sta.addr, state + 1, err);
505 err = 0;
506 }
507
508 /* unwind on error */
509 for (; state > IEEE80211_STA_NOTEXIST; state--)
510 WARN_ON(drv_sta_state(local, sdata, sta, state, state - 1));
511
512 return err;
513 }
514
515 static void
516 ieee80211_recalc_p2p_go_ps_allowed(struct ieee80211_sub_if_data *sdata)
517 {
518 struct ieee80211_local *local = sdata->local;
519 bool allow_p2p_go_ps = sdata->vif.p2p;
520 struct sta_info *sta;
521
522 rcu_read_lock();
523 list_for_each_entry_rcu(sta, &local->sta_list, list) {
524 if (sdata != sta->sdata ||
525 !test_sta_flag(sta, WLAN_STA_ASSOC))
526 continue;
527 if (!sta->sta.support_p2p_ps) {
528 allow_p2p_go_ps = false;
529 break;
530 }
531 }
532 rcu_read_unlock();
533
534 if (allow_p2p_go_ps != sdata->vif.bss_conf.allow_p2p_go_ps) {
535 sdata->vif.bss_conf.allow_p2p_go_ps = allow_p2p_go_ps;
536 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_P2P_PS);
537 }
538 }
539
540 /*
541 * should be called with sta_mtx locked
542 * this function replaces the mutex lock
543 * with a RCU lock
544 */
545 static int sta_info_insert_finish(struct sta_info *sta) __acquires(RCU)
546 {
547 struct ieee80211_local *local = sta->local;
548 struct ieee80211_sub_if_data *sdata = sta->sdata;
549 struct station_info *sinfo = NULL;
550 int err = 0;
551
552 lockdep_assert_held(&local->sta_mtx);
553
554 /* check if STA exists already */
555 if (sta_info_get_bss(sdata, sta->sta.addr)) {
556 err = -EEXIST;
557 goto out_err;
558 }
559
560 sinfo = kzalloc(sizeof(struct station_info), GFP_KERNEL);
561 if (!sinfo) {
562 err = -ENOMEM;
563 goto out_err;
564 }
565
566 local->num_sta++;
567 local->sta_generation++;
568 smp_mb();
569
570 /* simplify things and don't accept BA sessions yet */
571 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
572
573 /* make the station visible */
574 err = sta_info_hash_add(local, sta);
575 if (err)
576 goto out_drop_sta;
577
578 list_add_tail_rcu(&sta->list, &local->sta_list);
579
580 /* notify driver */
581 err = sta_info_insert_drv_state(local, sdata, sta);
582 if (err)
583 goto out_remove;
584
585 set_sta_flag(sta, WLAN_STA_INSERTED);
586
587 if (sta->sta_state >= IEEE80211_STA_ASSOC) {
588 ieee80211_recalc_min_chandef(sta->sdata);
589 if (!sta->sta.support_p2p_ps)
590 ieee80211_recalc_p2p_go_ps_allowed(sta->sdata);
591 }
592
593 /* accept BA sessions now */
594 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
595
596 ieee80211_sta_debugfs_add(sta);
597 rate_control_add_sta_debugfs(sta);
598
599 sinfo->generation = local->sta_generation;
600 cfg80211_new_sta(sdata->dev, sta->sta.addr, sinfo, GFP_KERNEL);
601 kfree(sinfo);
602
603 sta_dbg(sdata, "Inserted STA %pM\n", sta->sta.addr);
604
605 /* move reference to rcu-protected */
606 rcu_read_lock();
607 mutex_unlock(&local->sta_mtx);
608
609 if (ieee80211_vif_is_mesh(&sdata->vif))
610 mesh_accept_plinks_update(sdata);
611
612 return 0;
613 out_remove:
614 sta_info_hash_del(local, sta);
615 list_del_rcu(&sta->list);
616 out_drop_sta:
617 local->num_sta--;
618 synchronize_net();
619 __cleanup_single_sta(sta);
620 out_err:
621 mutex_unlock(&local->sta_mtx);
622 kfree(sinfo);
623 rcu_read_lock();
624 return err;
625 }
626
627 int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU)
628 {
629 struct ieee80211_local *local = sta->local;
630 int err;
631
632 might_sleep();
633
634 mutex_lock(&local->sta_mtx);
635
636 err = sta_info_insert_check(sta);
637 if (err) {
638 mutex_unlock(&local->sta_mtx);
639 rcu_read_lock();
640 goto out_free;
641 }
642
643 err = sta_info_insert_finish(sta);
644 if (err)
645 goto out_free;
646
647 return 0;
648 out_free:
649 sta_info_free(local, sta);
650 return err;
651 }
652
653 int sta_info_insert(struct sta_info *sta)
654 {
655 int err = sta_info_insert_rcu(sta);
656
657 rcu_read_unlock();
658
659 return err;
660 }
661
662 static inline void __bss_tim_set(u8 *tim, u16 id)
663 {
664 /*
665 * This format has been mandated by the IEEE specifications,
666 * so this line may not be changed to use the __set_bit() format.
667 */
668 tim[id / 8] |= (1 << (id % 8));
669 }
670
671 static inline void __bss_tim_clear(u8 *tim, u16 id)
672 {
673 /*
674 * This format has been mandated by the IEEE specifications,
675 * so this line may not be changed to use the __clear_bit() format.
676 */
677 tim[id / 8] &= ~(1 << (id % 8));
678 }
679
680 static inline bool __bss_tim_get(u8 *tim, u16 id)
681 {
682 /*
683 * This format has been mandated by the IEEE specifications,
684 * so this line may not be changed to use the test_bit() format.
685 */
686 return tim[id / 8] & (1 << (id % 8));
687 }
688
689 static unsigned long ieee80211_tids_for_ac(int ac)
690 {
691 /* If we ever support TIDs > 7, this obviously needs to be adjusted */
692 switch (ac) {
693 case IEEE80211_AC_VO:
694 return BIT(6) | BIT(7);
695 case IEEE80211_AC_VI:
696 return BIT(4) | BIT(5);
697 case IEEE80211_AC_BE:
698 return BIT(0) | BIT(3);
699 case IEEE80211_AC_BK:
700 return BIT(1) | BIT(2);
701 default:
702 WARN_ON(1);
703 return 0;
704 }
705 }
706
707 static void __sta_info_recalc_tim(struct sta_info *sta, bool ignore_pending)
708 {
709 struct ieee80211_local *local = sta->local;
710 struct ps_data *ps;
711 bool indicate_tim = false;
712 u8 ignore_for_tim = sta->sta.uapsd_queues;
713 int ac;
714 u16 id = sta->sta.aid;
715
716 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
717 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
718 if (WARN_ON_ONCE(!sta->sdata->bss))
719 return;
720
721 ps = &sta->sdata->bss->ps;
722 #ifdef CONFIG_MAC80211_MESH
723 } else if (ieee80211_vif_is_mesh(&sta->sdata->vif)) {
724 ps = &sta->sdata->u.mesh.ps;
725 #endif
726 } else {
727 return;
728 }
729
730 /* No need to do anything if the driver does all */
731 if (ieee80211_hw_check(&local->hw, AP_LINK_PS) && !local->ops->set_tim)
732 return;
733
734 if (sta->dead)
735 goto done;
736
737 /*
738 * If all ACs are delivery-enabled then we should build
739 * the TIM bit for all ACs anyway; if only some are then
740 * we ignore those and build the TIM bit using only the
741 * non-enabled ones.
742 */
743 if (ignore_for_tim == BIT(IEEE80211_NUM_ACS) - 1)
744 ignore_for_tim = 0;
745
746 if (ignore_pending)
747 ignore_for_tim = BIT(IEEE80211_NUM_ACS) - 1;
748
749 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
750 unsigned long tids;
751
752 if (ignore_for_tim & ieee80211_ac_to_qos_mask[ac])
753 continue;
754
755 indicate_tim |= !skb_queue_empty(&sta->tx_filtered[ac]) ||
756 !skb_queue_empty(&sta->ps_tx_buf[ac]);
757 if (indicate_tim)
758 break;
759
760 tids = ieee80211_tids_for_ac(ac);
761
762 indicate_tim |=
763 sta->driver_buffered_tids & tids;
764 indicate_tim |=
765 sta->txq_buffered_tids & tids;
766 }
767
768 done:
769 spin_lock_bh(&local->tim_lock);
770
771 if (indicate_tim == __bss_tim_get(ps->tim, id))
772 goto out_unlock;
773
774 if (indicate_tim)
775 __bss_tim_set(ps->tim, id);
776 else
777 __bss_tim_clear(ps->tim, id);
778
779 if (local->ops->set_tim && !WARN_ON(sta->dead)) {
780 local->tim_in_locked_section = true;
781 drv_set_tim(local, &sta->sta, indicate_tim);
782 local->tim_in_locked_section = false;
783 }
784
785 out_unlock:
786 spin_unlock_bh(&local->tim_lock);
787 }
788
789 void sta_info_recalc_tim(struct sta_info *sta)
790 {
791 __sta_info_recalc_tim(sta, false);
792 }
793
794 static bool sta_info_buffer_expired(struct sta_info *sta, struct sk_buff *skb)
795 {
796 struct ieee80211_tx_info *info;
797 int timeout;
798
799 if (!skb)
800 return false;
801
802 info = IEEE80211_SKB_CB(skb);
803
804 /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
805 timeout = (sta->listen_interval *
806 sta->sdata->vif.bss_conf.beacon_int *
807 32 / 15625) * HZ;
808 if (timeout < STA_TX_BUFFER_EXPIRE)
809 timeout = STA_TX_BUFFER_EXPIRE;
810 return time_after(jiffies, info->control.jiffies + timeout);
811 }
812
813
814 static bool sta_info_cleanup_expire_buffered_ac(struct ieee80211_local *local,
815 struct sta_info *sta, int ac)
816 {
817 unsigned long flags;
818 struct sk_buff *skb;
819
820 /*
821 * First check for frames that should expire on the filtered
822 * queue. Frames here were rejected by the driver and are on
823 * a separate queue to avoid reordering with normal PS-buffered
824 * frames. They also aren't accounted for right now in the
825 * total_ps_buffered counter.
826 */
827 for (;;) {
828 spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
829 skb = skb_peek(&sta->tx_filtered[ac]);
830 if (sta_info_buffer_expired(sta, skb))
831 skb = __skb_dequeue(&sta->tx_filtered[ac]);
832 else
833 skb = NULL;
834 spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
835
836 /*
837 * Frames are queued in order, so if this one
838 * hasn't expired yet we can stop testing. If
839 * we actually reached the end of the queue we
840 * also need to stop, of course.
841 */
842 if (!skb)
843 break;
844 ieee80211_free_txskb(&local->hw, skb);
845 }
846
847 /*
848 * Now also check the normal PS-buffered queue, this will
849 * only find something if the filtered queue was emptied
850 * since the filtered frames are all before the normal PS
851 * buffered frames.
852 */
853 for (;;) {
854 spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
855 skb = skb_peek(&sta->ps_tx_buf[ac]);
856 if (sta_info_buffer_expired(sta, skb))
857 skb = __skb_dequeue(&sta->ps_tx_buf[ac]);
858 else
859 skb = NULL;
860 spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
861
862 /*
863 * frames are queued in order, so if this one
864 * hasn't expired yet (or we reached the end of
865 * the queue) we can stop testing
866 */
867 if (!skb)
868 break;
869
870 local->total_ps_buffered--;
871 ps_dbg(sta->sdata, "Buffered frame expired (STA %pM)\n",
872 sta->sta.addr);
873 ieee80211_free_txskb(&local->hw, skb);
874 }
875
876 /*
877 * Finally, recalculate the TIM bit for this station -- it might
878 * now be clear because the station was too slow to retrieve its
879 * frames.
880 */
881 sta_info_recalc_tim(sta);
882
883 /*
884 * Return whether there are any frames still buffered, this is
885 * used to check whether the cleanup timer still needs to run,
886 * if there are no frames we don't need to rearm the timer.
887 */
888 return !(skb_queue_empty(&sta->ps_tx_buf[ac]) &&
889 skb_queue_empty(&sta->tx_filtered[ac]));
890 }
891
892 static bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
893 struct sta_info *sta)
894 {
895 bool have_buffered = false;
896 int ac;
897
898 /* This is only necessary for stations on BSS/MBSS interfaces */
899 if (!sta->sdata->bss &&
900 !ieee80211_vif_is_mesh(&sta->sdata->vif))
901 return false;
902
903 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
904 have_buffered |=
905 sta_info_cleanup_expire_buffered_ac(local, sta, ac);
906
907 return have_buffered;
908 }
909
910 static int __must_check __sta_info_destroy_part1(struct sta_info *sta)
911 {
912 struct ieee80211_local *local;
913 struct ieee80211_sub_if_data *sdata;
914 int ret;
915
916 might_sleep();
917
918 if (!sta)
919 return -ENOENT;
920
921 local = sta->local;
922 sdata = sta->sdata;
923
924 lockdep_assert_held(&local->sta_mtx);
925
926 /*
927 * Before removing the station from the driver and
928 * rate control, it might still start new aggregation
929 * sessions -- block that to make sure the tear-down
930 * will be sufficient.
931 */
932 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
933 ieee80211_sta_tear_down_BA_sessions(sta, AGG_STOP_DESTROY_STA);
934
935 /*
936 * Before removing the station from the driver there might be pending
937 * rx frames on RSS queues sent prior to the disassociation - wait for
938 * all such frames to be processed.
939 */
940 drv_sync_rx_queues(local, sta);
941
942 ret = sta_info_hash_del(local, sta);
943 if (WARN_ON(ret))
944 return ret;
945
946 /*
947 * for TDLS peers, make sure to return to the base channel before
948 * removal.
949 */
950 if (test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) {
951 drv_tdls_cancel_channel_switch(local, sdata, &sta->sta);
952 clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
953 }
954
955 list_del_rcu(&sta->list);
956 sta->removed = true;
957
958 drv_sta_pre_rcu_remove(local, sta->sdata, sta);
959
960 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
961 rcu_access_pointer(sdata->u.vlan.sta) == sta)
962 RCU_INIT_POINTER(sdata->u.vlan.sta, NULL);
963
964 return 0;
965 }
966
967 static void __sta_info_destroy_part2(struct sta_info *sta)
968 {
969 struct ieee80211_local *local = sta->local;
970 struct ieee80211_sub_if_data *sdata = sta->sdata;
971 struct station_info *sinfo;
972 int ret;
973
974 /*
975 * NOTE: This assumes at least synchronize_net() was done
976 * after _part1 and before _part2!
977 */
978
979 might_sleep();
980 lockdep_assert_held(&local->sta_mtx);
981
982 /* now keys can no longer be reached */
983 ieee80211_free_sta_keys(local, sta);
984
985 /* disable TIM bit - last chance to tell driver */
986 __sta_info_recalc_tim(sta, true);
987
988 sta->dead = true;
989
990 local->num_sta--;
991 local->sta_generation++;
992
993 while (sta->sta_state > IEEE80211_STA_NONE) {
994 ret = sta_info_move_state(sta, sta->sta_state - 1);
995 if (ret) {
996 WARN_ON_ONCE(1);
997 break;
998 }
999 }
1000
1001 if (sta->uploaded) {
1002 ret = drv_sta_state(local, sdata, sta, IEEE80211_STA_NONE,
1003 IEEE80211_STA_NOTEXIST);
1004 WARN_ON_ONCE(ret != 0);
1005 }
1006
1007 sta_dbg(sdata, "Removed STA %pM\n", sta->sta.addr);
1008
1009 sinfo = kzalloc(sizeof(*sinfo), GFP_KERNEL);
1010 if (sinfo)
1011 sta_set_sinfo(sta, sinfo, true);
1012 cfg80211_del_sta_sinfo(sdata->dev, sta->sta.addr, sinfo, GFP_KERNEL);
1013 kfree(sinfo);
1014
1015 rate_control_remove_sta_debugfs(sta);
1016 ieee80211_sta_debugfs_remove(sta);
1017
1018 cleanup_single_sta(sta);
1019 }
1020
1021 int __must_check __sta_info_destroy(struct sta_info *sta)
1022 {
1023 int err = __sta_info_destroy_part1(sta);
1024
1025 if (err)
1026 return err;
1027
1028 synchronize_net();
1029
1030 __sta_info_destroy_part2(sta);
1031
1032 return 0;
1033 }
1034
1035 int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, const u8 *addr)
1036 {
1037 struct sta_info *sta;
1038 int ret;
1039
1040 mutex_lock(&sdata->local->sta_mtx);
1041 sta = sta_info_get(sdata, addr);
1042 ret = __sta_info_destroy(sta);
1043 mutex_unlock(&sdata->local->sta_mtx);
1044
1045 return ret;
1046 }
1047
1048 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
1049 const u8 *addr)
1050 {
1051 struct sta_info *sta;
1052 int ret;
1053
1054 mutex_lock(&sdata->local->sta_mtx);
1055 sta = sta_info_get_bss(sdata, addr);
1056 ret = __sta_info_destroy(sta);
1057 mutex_unlock(&sdata->local->sta_mtx);
1058
1059 return ret;
1060 }
1061
1062 static void sta_info_cleanup(struct timer_list *t)
1063 {
1064 struct ieee80211_local *local = from_timer(local, t, sta_cleanup);
1065 struct sta_info *sta;
1066 bool timer_needed = false;
1067
1068 rcu_read_lock();
1069 list_for_each_entry_rcu(sta, &local->sta_list, list)
1070 if (sta_info_cleanup_expire_buffered(local, sta))
1071 timer_needed = true;
1072 rcu_read_unlock();
1073
1074 if (local->quiescing)
1075 return;
1076
1077 if (!timer_needed)
1078 return;
1079
1080 mod_timer(&local->sta_cleanup,
1081 round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL));
1082 }
1083
1084 int sta_info_init(struct ieee80211_local *local)
1085 {
1086 int err;
1087
1088 err = rhltable_init(&local->sta_hash, &sta_rht_params);
1089 if (err)
1090 return err;
1091
1092 spin_lock_init(&local->tim_lock);
1093 mutex_init(&local->sta_mtx);
1094 INIT_LIST_HEAD(&local->sta_list);
1095
1096 timer_setup(&local->sta_cleanup, sta_info_cleanup, 0);
1097 return 0;
1098 }
1099
1100 void sta_info_stop(struct ieee80211_local *local)
1101 {
1102 del_timer_sync(&local->sta_cleanup);
1103 rhltable_destroy(&local->sta_hash);
1104 }
1105
1106
1107 int __sta_info_flush(struct ieee80211_sub_if_data *sdata, bool vlans)
1108 {
1109 struct ieee80211_local *local = sdata->local;
1110 struct sta_info *sta, *tmp;
1111 LIST_HEAD(free_list);
1112 int ret = 0;
1113
1114 might_sleep();
1115
1116 WARN_ON(vlans && sdata->vif.type != NL80211_IFTYPE_AP);
1117 WARN_ON(vlans && !sdata->bss);
1118
1119 mutex_lock(&local->sta_mtx);
1120 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1121 if (sdata == sta->sdata ||
1122 (vlans && sdata->bss == sta->sdata->bss)) {
1123 if (!WARN_ON(__sta_info_destroy_part1(sta)))
1124 list_add(&sta->free_list, &free_list);
1125 ret++;
1126 }
1127 }
1128
1129 if (!list_empty(&free_list)) {
1130 synchronize_net();
1131 list_for_each_entry_safe(sta, tmp, &free_list, free_list)
1132 __sta_info_destroy_part2(sta);
1133 }
1134 mutex_unlock(&local->sta_mtx);
1135
1136 return ret;
1137 }
1138
1139 void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
1140 unsigned long exp_time)
1141 {
1142 struct ieee80211_local *local = sdata->local;
1143 struct sta_info *sta, *tmp;
1144
1145 mutex_lock(&local->sta_mtx);
1146
1147 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1148 unsigned long last_active = ieee80211_sta_last_active(sta);
1149
1150 if (sdata != sta->sdata)
1151 continue;
1152
1153 if (time_is_before_jiffies(last_active + exp_time)) {
1154 sta_dbg(sta->sdata, "expiring inactive STA %pM\n",
1155 sta->sta.addr);
1156
1157 if (ieee80211_vif_is_mesh(&sdata->vif) &&
1158 test_sta_flag(sta, WLAN_STA_PS_STA))
1159 atomic_dec(&sdata->u.mesh.ps.num_sta_ps);
1160
1161 WARN_ON(__sta_info_destroy(sta));
1162 }
1163 }
1164
1165 mutex_unlock(&local->sta_mtx);
1166 }
1167
1168 struct ieee80211_sta *ieee80211_find_sta_by_ifaddr(struct ieee80211_hw *hw,
1169 const u8 *addr,
1170 const u8 *localaddr)
1171 {
1172 struct ieee80211_local *local = hw_to_local(hw);
1173 struct rhlist_head *tmp;
1174 struct sta_info *sta;
1175
1176 /*
1177 * Just return a random station if localaddr is NULL
1178 * ... first in list.
1179 */
1180 for_each_sta_info(local, addr, sta, tmp) {
1181 if (localaddr &&
1182 !ether_addr_equal(sta->sdata->vif.addr, localaddr))
1183 continue;
1184 if (!sta->uploaded)
1185 return NULL;
1186 return &sta->sta;
1187 }
1188
1189 return NULL;
1190 }
1191 EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr);
1192
1193 struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif,
1194 const u8 *addr)
1195 {
1196 struct sta_info *sta;
1197
1198 if (!vif)
1199 return NULL;
1200
1201 sta = sta_info_get_bss(vif_to_sdata(vif), addr);
1202 if (!sta)
1203 return NULL;
1204
1205 if (!sta->uploaded)
1206 return NULL;
1207
1208 return &sta->sta;
1209 }
1210 EXPORT_SYMBOL(ieee80211_find_sta);
1211
1212 /* powersave support code */
1213 void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta)
1214 {
1215 struct ieee80211_sub_if_data *sdata = sta->sdata;
1216 struct ieee80211_local *local = sdata->local;
1217 struct sk_buff_head pending;
1218 int filtered = 0, buffered = 0, ac, i;
1219 unsigned long flags;
1220 struct ps_data *ps;
1221
1222 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1223 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
1224 u.ap);
1225
1226 if (sdata->vif.type == NL80211_IFTYPE_AP)
1227 ps = &sdata->bss->ps;
1228 else if (ieee80211_vif_is_mesh(&sdata->vif))
1229 ps = &sdata->u.mesh.ps;
1230 else
1231 return;
1232
1233 clear_sta_flag(sta, WLAN_STA_SP);
1234
1235 BUILD_BUG_ON(BITS_TO_LONGS(IEEE80211_NUM_TIDS) > 1);
1236 sta->driver_buffered_tids = 0;
1237 sta->txq_buffered_tids = 0;
1238
1239 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
1240 drv_sta_notify(local, sdata, STA_NOTIFY_AWAKE, &sta->sta);
1241
1242 if (sta->sta.txq[0]) {
1243 for (i = 0; i < ARRAY_SIZE(sta->sta.txq); i++) {
1244 if (!txq_has_queue(sta->sta.txq[i]))
1245 continue;
1246
1247 drv_wake_tx_queue(local, to_txq_info(sta->sta.txq[i]));
1248 }
1249 }
1250
1251 skb_queue_head_init(&pending);
1252
1253 /* sync with ieee80211_tx_h_unicast_ps_buf */
1254 spin_lock(&sta->ps_lock);
1255 /* Send all buffered frames to the station */
1256 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1257 int count = skb_queue_len(&pending), tmp;
1258
1259 spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
1260 skb_queue_splice_tail_init(&sta->tx_filtered[ac], &pending);
1261 spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
1262 tmp = skb_queue_len(&pending);
1263 filtered += tmp - count;
1264 count = tmp;
1265
1266 spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
1267 skb_queue_splice_tail_init(&sta->ps_tx_buf[ac], &pending);
1268 spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
1269 tmp = skb_queue_len(&pending);
1270 buffered += tmp - count;
1271 }
1272
1273 ieee80211_add_pending_skbs(local, &pending);
1274
1275 /* now we're no longer in the deliver code */
1276 clear_sta_flag(sta, WLAN_STA_PS_DELIVER);
1277
1278 /* The station might have polled and then woken up before we responded,
1279 * so clear these flags now to avoid them sticking around.
1280 */
1281 clear_sta_flag(sta, WLAN_STA_PSPOLL);
1282 clear_sta_flag(sta, WLAN_STA_UAPSD);
1283 spin_unlock(&sta->ps_lock);
1284
1285 atomic_dec(&ps->num_sta_ps);
1286
1287 /* This station just woke up and isn't aware of our SMPS state */
1288 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
1289 !ieee80211_smps_is_restrictive(sta->known_smps_mode,
1290 sdata->smps_mode) &&
1291 sta->known_smps_mode != sdata->bss->req_smps &&
1292 sta_info_tx_streams(sta) != 1) {
1293 ht_dbg(sdata,
1294 "%pM just woke up and MIMO capable - update SMPS\n",
1295 sta->sta.addr);
1296 ieee80211_send_smps_action(sdata, sdata->bss->req_smps,
1297 sta->sta.addr,
1298 sdata->vif.bss_conf.bssid);
1299 }
1300
1301 local->total_ps_buffered -= buffered;
1302
1303 sta_info_recalc_tim(sta);
1304
1305 ps_dbg(sdata,
1306 "STA %pM aid %d sending %d filtered/%d PS frames since STA woke up\n",
1307 sta->sta.addr, sta->sta.aid, filtered, buffered);
1308
1309 ieee80211_check_fast_xmit(sta);
1310 }
1311
1312 static void ieee80211_send_null_response(struct sta_info *sta, int tid,
1313 enum ieee80211_frame_release_type reason,
1314 bool call_driver, bool more_data)
1315 {
1316 struct ieee80211_sub_if_data *sdata = sta->sdata;
1317 struct ieee80211_local *local = sdata->local;
1318 struct ieee80211_qos_hdr *nullfunc;
1319 struct sk_buff *skb;
1320 int size = sizeof(*nullfunc);
1321 __le16 fc;
1322 bool qos = sta->sta.wme;
1323 struct ieee80211_tx_info *info;
1324 struct ieee80211_chanctx_conf *chanctx_conf;
1325
1326 /* Don't send NDPs when STA is connected HE */
1327 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1328 !(sdata->u.mgd.flags & IEEE80211_STA_DISABLE_HE))
1329 return;
1330
1331 if (qos) {
1332 fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1333 IEEE80211_STYPE_QOS_NULLFUNC |
1334 IEEE80211_FCTL_FROMDS);
1335 } else {
1336 size -= 2;
1337 fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1338 IEEE80211_STYPE_NULLFUNC |
1339 IEEE80211_FCTL_FROMDS);
1340 }
1341
1342 skb = dev_alloc_skb(local->hw.extra_tx_headroom + size);
1343 if (!skb)
1344 return;
1345
1346 skb_reserve(skb, local->hw.extra_tx_headroom);
1347
1348 nullfunc = skb_put(skb, size);
1349 nullfunc->frame_control = fc;
1350 nullfunc->duration_id = 0;
1351 memcpy(nullfunc->addr1, sta->sta.addr, ETH_ALEN);
1352 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
1353 memcpy(nullfunc->addr3, sdata->vif.addr, ETH_ALEN);
1354 nullfunc->seq_ctrl = 0;
1355
1356 skb->priority = tid;
1357 skb_set_queue_mapping(skb, ieee802_1d_to_ac[tid]);
1358 if (qos) {
1359 nullfunc->qos_ctrl = cpu_to_le16(tid);
1360
1361 if (reason == IEEE80211_FRAME_RELEASE_UAPSD) {
1362 nullfunc->qos_ctrl |=
1363 cpu_to_le16(IEEE80211_QOS_CTL_EOSP);
1364 if (more_data)
1365 nullfunc->frame_control |=
1366 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1367 }
1368 }
1369
1370 info = IEEE80211_SKB_CB(skb);
1371
1372 /*
1373 * Tell TX path to send this frame even though the
1374 * STA may still remain is PS mode after this frame
1375 * exchange. Also set EOSP to indicate this packet
1376 * ends the poll/service period.
1377 */
1378 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER |
1379 IEEE80211_TX_STATUS_EOSP |
1380 IEEE80211_TX_CTL_REQ_TX_STATUS;
1381
1382 info->control.flags |= IEEE80211_TX_CTRL_PS_RESPONSE;
1383
1384 if (call_driver)
1385 drv_allow_buffered_frames(local, sta, BIT(tid), 1,
1386 reason, false);
1387
1388 skb->dev = sdata->dev;
1389
1390 rcu_read_lock();
1391 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1392 if (WARN_ON(!chanctx_conf)) {
1393 rcu_read_unlock();
1394 kfree_skb(skb);
1395 return;
1396 }
1397
1398 info->band = chanctx_conf->def.chan->band;
1399 ieee80211_xmit(sdata, sta, skb, 0);
1400 rcu_read_unlock();
1401 }
1402
1403 static int find_highest_prio_tid(unsigned long tids)
1404 {
1405 /* lower 3 TIDs aren't ordered perfectly */
1406 if (tids & 0xF8)
1407 return fls(tids) - 1;
1408 /* TID 0 is BE just like TID 3 */
1409 if (tids & BIT(0))
1410 return 0;
1411 return fls(tids) - 1;
1412 }
1413
1414 /* Indicates if the MORE_DATA bit should be set in the last
1415 * frame obtained by ieee80211_sta_ps_get_frames.
1416 * Note that driver_release_tids is relevant only if
1417 * reason = IEEE80211_FRAME_RELEASE_PSPOLL
1418 */
1419 static bool
1420 ieee80211_sta_ps_more_data(struct sta_info *sta, u8 ignored_acs,
1421 enum ieee80211_frame_release_type reason,
1422 unsigned long driver_release_tids)
1423 {
1424 int ac;
1425
1426 /* If the driver has data on more than one TID then
1427 * certainly there's more data if we release just a
1428 * single frame now (from a single TID). This will
1429 * only happen for PS-Poll.
1430 */
1431 if (reason == IEEE80211_FRAME_RELEASE_PSPOLL &&
1432 hweight16(driver_release_tids) > 1)
1433 return true;
1434
1435 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1436 if (ignored_acs & ieee80211_ac_to_qos_mask[ac])
1437 continue;
1438
1439 if (!skb_queue_empty(&sta->tx_filtered[ac]) ||
1440 !skb_queue_empty(&sta->ps_tx_buf[ac]))
1441 return true;
1442 }
1443
1444 return false;
1445 }
1446
1447 static void
1448 ieee80211_sta_ps_get_frames(struct sta_info *sta, int n_frames, u8 ignored_acs,
1449 enum ieee80211_frame_release_type reason,
1450 struct sk_buff_head *frames,
1451 unsigned long *driver_release_tids)
1452 {
1453 struct ieee80211_sub_if_data *sdata = sta->sdata;
1454 struct ieee80211_local *local = sdata->local;
1455 int ac;
1456
1457 /* Get response frame(s) and more data bit for the last one. */
1458 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1459 unsigned long tids;
1460
1461 if (ignored_acs & ieee80211_ac_to_qos_mask[ac])
1462 continue;
1463
1464 tids = ieee80211_tids_for_ac(ac);
1465
1466 /* if we already have frames from software, then we can't also
1467 * release from hardware queues
1468 */
1469 if (skb_queue_empty(frames)) {
1470 *driver_release_tids |=
1471 sta->driver_buffered_tids & tids;
1472 *driver_release_tids |= sta->txq_buffered_tids & tids;
1473 }
1474
1475 if (!*driver_release_tids) {
1476 struct sk_buff *skb;
1477
1478 while (n_frames > 0) {
1479 skb = skb_dequeue(&sta->tx_filtered[ac]);
1480 if (!skb) {
1481 skb = skb_dequeue(
1482 &sta->ps_tx_buf[ac]);
1483 if (skb)
1484 local->total_ps_buffered--;
1485 }
1486 if (!skb)
1487 break;
1488 n_frames--;
1489 __skb_queue_tail(frames, skb);
1490 }
1491 }
1492
1493 /* If we have more frames buffered on this AC, then abort the
1494 * loop since we can't send more data from other ACs before
1495 * the buffered frames from this.
1496 */
1497 if (!skb_queue_empty(&sta->tx_filtered[ac]) ||
1498 !skb_queue_empty(&sta->ps_tx_buf[ac]))
1499 break;
1500 }
1501 }
1502
1503 static void
1504 ieee80211_sta_ps_deliver_response(struct sta_info *sta,
1505 int n_frames, u8 ignored_acs,
1506 enum ieee80211_frame_release_type reason)
1507 {
1508 struct ieee80211_sub_if_data *sdata = sta->sdata;
1509 struct ieee80211_local *local = sdata->local;
1510 unsigned long driver_release_tids = 0;
1511 struct sk_buff_head frames;
1512 bool more_data;
1513
1514 /* Service or PS-Poll period starts */
1515 set_sta_flag(sta, WLAN_STA_SP);
1516
1517 __skb_queue_head_init(&frames);
1518
1519 ieee80211_sta_ps_get_frames(sta, n_frames, ignored_acs, reason,
1520 &frames, &driver_release_tids);
1521
1522 more_data = ieee80211_sta_ps_more_data(sta, ignored_acs, reason, driver_release_tids);
1523
1524 if (driver_release_tids && reason == IEEE80211_FRAME_RELEASE_PSPOLL)
1525 driver_release_tids =
1526 BIT(find_highest_prio_tid(driver_release_tids));
1527
1528 if (skb_queue_empty(&frames) && !driver_release_tids) {
1529 int tid, ac;
1530
1531 /*
1532 * For PS-Poll, this can only happen due to a race condition
1533 * when we set the TIM bit and the station notices it, but
1534 * before it can poll for the frame we expire it.
1535 *
1536 * For uAPSD, this is said in the standard (11.2.1.5 h):
1537 * At each unscheduled SP for a non-AP STA, the AP shall
1538 * attempt to transmit at least one MSDU or MMPDU, but no
1539 * more than the value specified in the Max SP Length field
1540 * in the QoS Capability element from delivery-enabled ACs,
1541 * that are destined for the non-AP STA.
1542 *
1543 * Since we have no other MSDU/MMPDU, transmit a QoS null frame.
1544 */
1545
1546 /* This will evaluate to 1, 3, 5 or 7. */
1547 for (ac = IEEE80211_AC_VO; ac < IEEE80211_NUM_ACS; ac++)
1548 if (!(ignored_acs & ieee80211_ac_to_qos_mask[ac]))
1549 break;
1550 tid = 7 - 2 * ac;
1551
1552 ieee80211_send_null_response(sta, tid, reason, true, false);
1553 } else if (!driver_release_tids) {
1554 struct sk_buff_head pending;
1555 struct sk_buff *skb;
1556 int num = 0;
1557 u16 tids = 0;
1558 bool need_null = false;
1559
1560 skb_queue_head_init(&pending);
1561
1562 while ((skb = __skb_dequeue(&frames))) {
1563 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1564 struct ieee80211_hdr *hdr = (void *) skb->data;
1565 u8 *qoshdr = NULL;
1566
1567 num++;
1568
1569 /*
1570 * Tell TX path to send this frame even though the
1571 * STA may still remain is PS mode after this frame
1572 * exchange.
1573 */
1574 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
1575 info->control.flags |= IEEE80211_TX_CTRL_PS_RESPONSE;
1576
1577 /*
1578 * Use MoreData flag to indicate whether there are
1579 * more buffered frames for this STA
1580 */
1581 if (more_data || !skb_queue_empty(&frames))
1582 hdr->frame_control |=
1583 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1584 else
1585 hdr->frame_control &=
1586 cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
1587
1588 if (ieee80211_is_data_qos(hdr->frame_control) ||
1589 ieee80211_is_qos_nullfunc(hdr->frame_control))
1590 qoshdr = ieee80211_get_qos_ctl(hdr);
1591
1592 tids |= BIT(skb->priority);
1593
1594 __skb_queue_tail(&pending, skb);
1595
1596 /* end service period after last frame or add one */
1597 if (!skb_queue_empty(&frames))
1598 continue;
1599
1600 if (reason != IEEE80211_FRAME_RELEASE_UAPSD) {
1601 /* for PS-Poll, there's only one frame */
1602 info->flags |= IEEE80211_TX_STATUS_EOSP |
1603 IEEE80211_TX_CTL_REQ_TX_STATUS;
1604 break;
1605 }
1606
1607 /* For uAPSD, things are a bit more complicated. If the
1608 * last frame has a QoS header (i.e. is a QoS-data or
1609 * QoS-nulldata frame) then just set the EOSP bit there
1610 * and be done.
1611 * If the frame doesn't have a QoS header (which means
1612 * it should be a bufferable MMPDU) then we can't set
1613 * the EOSP bit in the QoS header; add a QoS-nulldata
1614 * frame to the list to send it after the MMPDU.
1615 *
1616 * Note that this code is only in the mac80211-release
1617 * code path, we assume that the driver will not buffer
1618 * anything but QoS-data frames, or if it does, will
1619 * create the QoS-nulldata frame by itself if needed.
1620 *
1621 * Cf. 802.11-2012 10.2.1.10 (c).
1622 */
1623 if (qoshdr) {
1624 *qoshdr |= IEEE80211_QOS_CTL_EOSP;
1625
1626 info->flags |= IEEE80211_TX_STATUS_EOSP |
1627 IEEE80211_TX_CTL_REQ_TX_STATUS;
1628 } else {
1629 /* The standard isn't completely clear on this
1630 * as it says the more-data bit should be set
1631 * if there are more BUs. The QoS-Null frame
1632 * we're about to send isn't buffered yet, we
1633 * only create it below, but let's pretend it
1634 * was buffered just in case some clients only
1635 * expect more-data=0 when eosp=1.
1636 */
1637 hdr->frame_control |=
1638 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1639 need_null = true;
1640 num++;
1641 }
1642 break;
1643 }
1644
1645 drv_allow_buffered_frames(local, sta, tids, num,
1646 reason, more_data);
1647
1648 ieee80211_add_pending_skbs(local, &pending);
1649
1650 if (need_null)
1651 ieee80211_send_null_response(
1652 sta, find_highest_prio_tid(tids),
1653 reason, false, false);
1654
1655 sta_info_recalc_tim(sta);
1656 } else {
1657 int tid;
1658
1659 /*
1660 * We need to release a frame that is buffered somewhere in the
1661 * driver ... it'll have to handle that.
1662 * Note that the driver also has to check the number of frames
1663 * on the TIDs we're releasing from - if there are more than
1664 * n_frames it has to set the more-data bit (if we didn't ask
1665 * it to set it anyway due to other buffered frames); if there
1666 * are fewer than n_frames it has to make sure to adjust that
1667 * to allow the service period to end properly.
1668 */
1669 drv_release_buffered_frames(local, sta, driver_release_tids,
1670 n_frames, reason, more_data);
1671
1672 /*
1673 * Note that we don't recalculate the TIM bit here as it would
1674 * most likely have no effect at all unless the driver told us
1675 * that the TID(s) became empty before returning here from the
1676 * release function.
1677 * Either way, however, when the driver tells us that the TID(s)
1678 * became empty or we find that a txq became empty, we'll do the
1679 * TIM recalculation.
1680 */
1681
1682 if (!sta->sta.txq[0])
1683 return;
1684
1685 for (tid = 0; tid < ARRAY_SIZE(sta->sta.txq); tid++) {
1686 if (!(driver_release_tids & BIT(tid)) ||
1687 txq_has_queue(sta->sta.txq[tid]))
1688 continue;
1689
1690 sta_info_recalc_tim(sta);
1691 break;
1692 }
1693 }
1694 }
1695
1696 void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta)
1697 {
1698 u8 ignore_for_response = sta->sta.uapsd_queues;
1699
1700 /*
1701 * If all ACs are delivery-enabled then we should reply
1702 * from any of them, if only some are enabled we reply
1703 * only from the non-enabled ones.
1704 */
1705 if (ignore_for_response == BIT(IEEE80211_NUM_ACS) - 1)
1706 ignore_for_response = 0;
1707
1708 ieee80211_sta_ps_deliver_response(sta, 1, ignore_for_response,
1709 IEEE80211_FRAME_RELEASE_PSPOLL);
1710 }
1711
1712 void ieee80211_sta_ps_deliver_uapsd(struct sta_info *sta)
1713 {
1714 int n_frames = sta->sta.max_sp;
1715 u8 delivery_enabled = sta->sta.uapsd_queues;
1716
1717 /*
1718 * If we ever grow support for TSPEC this might happen if
1719 * the TSPEC update from hostapd comes in between a trigger
1720 * frame setting WLAN_STA_UAPSD in the RX path and this
1721 * actually getting called.
1722 */
1723 if (!delivery_enabled)
1724 return;
1725
1726 switch (sta->sta.max_sp) {
1727 case 1:
1728 n_frames = 2;
1729 break;
1730 case 2:
1731 n_frames = 4;
1732 break;
1733 case 3:
1734 n_frames = 6;
1735 break;
1736 case 0:
1737 /* XXX: what is a good value? */
1738 n_frames = 128;
1739 break;
1740 }
1741
1742 ieee80211_sta_ps_deliver_response(sta, n_frames, ~delivery_enabled,
1743 IEEE80211_FRAME_RELEASE_UAPSD);
1744 }
1745
1746 void ieee80211_sta_block_awake(struct ieee80211_hw *hw,
1747 struct ieee80211_sta *pubsta, bool block)
1748 {
1749 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1750
1751 trace_api_sta_block_awake(sta->local, pubsta, block);
1752
1753 if (block) {
1754 set_sta_flag(sta, WLAN_STA_PS_DRIVER);
1755 ieee80211_clear_fast_xmit(sta);
1756 return;
1757 }
1758
1759 if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1760 return;
1761
1762 if (!test_sta_flag(sta, WLAN_STA_PS_STA)) {
1763 set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1764 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
1765 ieee80211_queue_work(hw, &sta->drv_deliver_wk);
1766 } else if (test_sta_flag(sta, WLAN_STA_PSPOLL) ||
1767 test_sta_flag(sta, WLAN_STA_UAPSD)) {
1768 /* must be asleep in this case */
1769 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
1770 ieee80211_queue_work(hw, &sta->drv_deliver_wk);
1771 } else {
1772 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
1773 ieee80211_check_fast_xmit(sta);
1774 }
1775 }
1776 EXPORT_SYMBOL(ieee80211_sta_block_awake);
1777
1778 void ieee80211_sta_eosp(struct ieee80211_sta *pubsta)
1779 {
1780 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1781 struct ieee80211_local *local = sta->local;
1782
1783 trace_api_eosp(local, pubsta);
1784
1785 clear_sta_flag(sta, WLAN_STA_SP);
1786 }
1787 EXPORT_SYMBOL(ieee80211_sta_eosp);
1788
1789 void ieee80211_send_eosp_nullfunc(struct ieee80211_sta *pubsta, int tid)
1790 {
1791 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1792 enum ieee80211_frame_release_type reason;
1793 bool more_data;
1794
1795 trace_api_send_eosp_nullfunc(sta->local, pubsta, tid);
1796
1797 reason = IEEE80211_FRAME_RELEASE_UAPSD;
1798 more_data = ieee80211_sta_ps_more_data(sta, ~sta->sta.uapsd_queues,
1799 reason, 0);
1800
1801 ieee80211_send_null_response(sta, tid, reason, false, more_data);
1802 }
1803 EXPORT_SYMBOL(ieee80211_send_eosp_nullfunc);
1804
1805 void ieee80211_sta_set_buffered(struct ieee80211_sta *pubsta,
1806 u8 tid, bool buffered)
1807 {
1808 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1809
1810 if (WARN_ON(tid >= IEEE80211_NUM_TIDS))
1811 return;
1812
1813 trace_api_sta_set_buffered(sta->local, pubsta, tid, buffered);
1814
1815 if (buffered)
1816 set_bit(tid, &sta->driver_buffered_tids);
1817 else
1818 clear_bit(tid, &sta->driver_buffered_tids);
1819
1820 sta_info_recalc_tim(sta);
1821 }
1822 EXPORT_SYMBOL(ieee80211_sta_set_buffered);
1823
1824 int sta_info_move_state(struct sta_info *sta,
1825 enum ieee80211_sta_state new_state)
1826 {
1827 might_sleep();
1828
1829 if (sta->sta_state == new_state)
1830 return 0;
1831
1832 /* check allowed transitions first */
1833
1834 switch (new_state) {
1835 case IEEE80211_STA_NONE:
1836 if (sta->sta_state != IEEE80211_STA_AUTH)
1837 return -EINVAL;
1838 break;
1839 case IEEE80211_STA_AUTH:
1840 if (sta->sta_state != IEEE80211_STA_NONE &&
1841 sta->sta_state != IEEE80211_STA_ASSOC)
1842 return -EINVAL;
1843 break;
1844 case IEEE80211_STA_ASSOC:
1845 if (sta->sta_state != IEEE80211_STA_AUTH &&
1846 sta->sta_state != IEEE80211_STA_AUTHORIZED)
1847 return -EINVAL;
1848 break;
1849 case IEEE80211_STA_AUTHORIZED:
1850 if (sta->sta_state != IEEE80211_STA_ASSOC)
1851 return -EINVAL;
1852 break;
1853 default:
1854 WARN(1, "invalid state %d", new_state);
1855 return -EINVAL;
1856 }
1857
1858 sta_dbg(sta->sdata, "moving STA %pM to state %d\n",
1859 sta->sta.addr, new_state);
1860
1861 /*
1862 * notify the driver before the actual changes so it can
1863 * fail the transition
1864 */
1865 if (test_sta_flag(sta, WLAN_STA_INSERTED)) {
1866 int err = drv_sta_state(sta->local, sta->sdata, sta,
1867 sta->sta_state, new_state);
1868 if (err)
1869 return err;
1870 }
1871
1872 /* reflect the change in all state variables */
1873
1874 switch (new_state) {
1875 case IEEE80211_STA_NONE:
1876 if (sta->sta_state == IEEE80211_STA_AUTH)
1877 clear_bit(WLAN_STA_AUTH, &sta->_flags);
1878 break;
1879 case IEEE80211_STA_AUTH:
1880 if (sta->sta_state == IEEE80211_STA_NONE) {
1881 set_bit(WLAN_STA_AUTH, &sta->_flags);
1882 } else if (sta->sta_state == IEEE80211_STA_ASSOC) {
1883 clear_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 }
1888 break;
1889 case IEEE80211_STA_ASSOC:
1890 if (sta->sta_state == IEEE80211_STA_AUTH) {
1891 set_bit(WLAN_STA_ASSOC, &sta->_flags);
1892 ieee80211_recalc_min_chandef(sta->sdata);
1893 if (!sta->sta.support_p2p_ps)
1894 ieee80211_recalc_p2p_go_ps_allowed(sta->sdata);
1895 } else if (sta->sta_state == IEEE80211_STA_AUTHORIZED) {
1896 ieee80211_vif_dec_num_mcast(sta->sdata);
1897 clear_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
1898 ieee80211_clear_fast_xmit(sta);
1899 ieee80211_clear_fast_rx(sta);
1900 }
1901 break;
1902 case IEEE80211_STA_AUTHORIZED:
1903 if (sta->sta_state == IEEE80211_STA_ASSOC) {
1904 ieee80211_vif_inc_num_mcast(sta->sdata);
1905 set_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
1906 ieee80211_check_fast_xmit(sta);
1907 ieee80211_check_fast_rx(sta);
1908 }
1909 break;
1910 default:
1911 break;
1912 }
1913
1914 sta->sta_state = new_state;
1915
1916 return 0;
1917 }
1918
1919 u8 sta_info_tx_streams(struct sta_info *sta)
1920 {
1921 struct ieee80211_sta_ht_cap *ht_cap = &sta->sta.ht_cap;
1922 u8 rx_streams;
1923
1924 if (!sta->sta.ht_cap.ht_supported)
1925 return 1;
1926
1927 if (sta->sta.vht_cap.vht_supported) {
1928 int i;
1929 u16 tx_mcs_map =
1930 le16_to_cpu(sta->sta.vht_cap.vht_mcs.tx_mcs_map);
1931
1932 for (i = 7; i >= 0; i--)
1933 if ((tx_mcs_map & (0x3 << (i * 2))) !=
1934 IEEE80211_VHT_MCS_NOT_SUPPORTED)
1935 return i + 1;
1936 }
1937
1938 if (ht_cap->mcs.rx_mask[3])
1939 rx_streams = 4;
1940 else if (ht_cap->mcs.rx_mask[2])
1941 rx_streams = 3;
1942 else if (ht_cap->mcs.rx_mask[1])
1943 rx_streams = 2;
1944 else
1945 rx_streams = 1;
1946
1947 if (!(ht_cap->mcs.tx_params & IEEE80211_HT_MCS_TX_RX_DIFF))
1948 return rx_streams;
1949
1950 return ((ht_cap->mcs.tx_params & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
1951 >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1;
1952 }
1953
1954 static struct ieee80211_sta_rx_stats *
1955 sta_get_last_rx_stats(struct sta_info *sta)
1956 {
1957 struct ieee80211_sta_rx_stats *stats = &sta->rx_stats;
1958 struct ieee80211_local *local = sta->local;
1959 int cpu;
1960
1961 if (!ieee80211_hw_check(&local->hw, USES_RSS))
1962 return stats;
1963
1964 for_each_possible_cpu(cpu) {
1965 struct ieee80211_sta_rx_stats *cpustats;
1966
1967 cpustats = per_cpu_ptr(sta->pcpu_rx_stats, cpu);
1968
1969 if (time_after(cpustats->last_rx, stats->last_rx))
1970 stats = cpustats;
1971 }
1972
1973 return stats;
1974 }
1975
1976 static void sta_stats_decode_rate(struct ieee80211_local *local, u32 rate,
1977 struct rate_info *rinfo)
1978 {
1979 rinfo->bw = STA_STATS_GET(BW, rate);
1980
1981 switch (STA_STATS_GET(TYPE, rate)) {
1982 case STA_STATS_RATE_TYPE_VHT:
1983 rinfo->flags = RATE_INFO_FLAGS_VHT_MCS;
1984 rinfo->mcs = STA_STATS_GET(VHT_MCS, rate);
1985 rinfo->nss = STA_STATS_GET(VHT_NSS, rate);
1986 if (STA_STATS_GET(SGI, rate))
1987 rinfo->flags |= RATE_INFO_FLAGS_SHORT_GI;
1988 break;
1989 case STA_STATS_RATE_TYPE_HT:
1990 rinfo->flags = RATE_INFO_FLAGS_MCS;
1991 rinfo->mcs = STA_STATS_GET(HT_MCS, rate);
1992 if (STA_STATS_GET(SGI, rate))
1993 rinfo->flags |= RATE_INFO_FLAGS_SHORT_GI;
1994 break;
1995 case STA_STATS_RATE_TYPE_LEGACY: {
1996 struct ieee80211_supported_band *sband;
1997 u16 brate;
1998 unsigned int shift;
1999 int band = STA_STATS_GET(LEGACY_BAND, rate);
2000 int rate_idx = STA_STATS_GET(LEGACY_IDX, rate);
2001
2002 sband = local->hw.wiphy->bands[band];
2003 brate = sband->bitrates[rate_idx].bitrate;
2004 if (rinfo->bw == RATE_INFO_BW_5)
2005 shift = 2;
2006 else if (rinfo->bw == RATE_INFO_BW_10)
2007 shift = 1;
2008 else
2009 shift = 0;
2010 rinfo->legacy = DIV_ROUND_UP(brate, 1 << shift);
2011 break;
2012 }
2013 case STA_STATS_RATE_TYPE_HE:
2014 rinfo->flags = RATE_INFO_FLAGS_HE_MCS;
2015 rinfo->mcs = STA_STATS_GET(HE_MCS, rate);
2016 rinfo->nss = STA_STATS_GET(HE_NSS, rate);
2017 rinfo->he_gi = STA_STATS_GET(HE_GI, rate);
2018 rinfo->he_ru_alloc = STA_STATS_GET(HE_RU, rate);
2019 rinfo->he_dcm = STA_STATS_GET(HE_DCM, rate);
2020 break;
2021 }
2022 }
2023
2024 static int sta_set_rate_info_rx(struct sta_info *sta, struct rate_info *rinfo)
2025 {
2026 u16 rate = READ_ONCE(sta_get_last_rx_stats(sta)->last_rate);
2027
2028 if (rate == STA_STATS_RATE_INVALID)
2029 return -EINVAL;
2030
2031 sta_stats_decode_rate(sta->local, rate, rinfo);
2032 return 0;
2033 }
2034
2035 static void sta_set_tidstats(struct sta_info *sta,
2036 struct cfg80211_tid_stats *tidstats,
2037 int tid)
2038 {
2039 struct ieee80211_local *local = sta->local;
2040
2041 if (!(tidstats->filled & BIT(NL80211_TID_STATS_RX_MSDU))) {
2042 unsigned int start;
2043
2044 do {
2045 start = u64_stats_fetch_begin(&sta->rx_stats.syncp);
2046 tidstats->rx_msdu = sta->rx_stats.msdu[tid];
2047 } while (u64_stats_fetch_retry(&sta->rx_stats.syncp, start));
2048
2049 tidstats->filled |= BIT(NL80211_TID_STATS_RX_MSDU);
2050 }
2051
2052 if (!(tidstats->filled & BIT(NL80211_TID_STATS_TX_MSDU))) {
2053 tidstats->filled |= BIT(NL80211_TID_STATS_TX_MSDU);
2054 tidstats->tx_msdu = sta->tx_stats.msdu[tid];
2055 }
2056
2057 if (!(tidstats->filled & BIT(NL80211_TID_STATS_TX_MSDU_RETRIES)) &&
2058 ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
2059 tidstats->filled |= BIT(NL80211_TID_STATS_TX_MSDU_RETRIES);
2060 tidstats->tx_msdu_retries = sta->status_stats.msdu_retries[tid];
2061 }
2062
2063 if (!(tidstats->filled & BIT(NL80211_TID_STATS_TX_MSDU_FAILED)) &&
2064 ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
2065 tidstats->filled |= BIT(NL80211_TID_STATS_TX_MSDU_FAILED);
2066 tidstats->tx_msdu_failed = sta->status_stats.msdu_failed[tid];
2067 }
2068
2069 if (local->ops->wake_tx_queue && tid < IEEE80211_NUM_TIDS) {
2070 spin_lock_bh(&local->fq.lock);
2071 rcu_read_lock();
2072
2073 tidstats->filled |= BIT(NL80211_TID_STATS_TXQ_STATS);
2074 ieee80211_fill_txq_stats(&tidstats->txq_stats,
2075 to_txq_info(sta->sta.txq[tid]));
2076
2077 rcu_read_unlock();
2078 spin_unlock_bh(&local->fq.lock);
2079 }
2080 }
2081
2082 static inline u64 sta_get_stats_bytes(struct ieee80211_sta_rx_stats *rxstats)
2083 {
2084 unsigned int start;
2085 u64 value;
2086
2087 do {
2088 start = u64_stats_fetch_begin(&rxstats->syncp);
2089 value = rxstats->bytes;
2090 } while (u64_stats_fetch_retry(&rxstats->syncp, start));
2091
2092 return value;
2093 }
2094
2095 void sta_set_sinfo(struct sta_info *sta, struct station_info *sinfo,
2096 bool tidstats)
2097 {
2098 struct ieee80211_sub_if_data *sdata = sta->sdata;
2099 struct ieee80211_local *local = sdata->local;
2100 u32 thr = 0;
2101 int i, ac, cpu;
2102 struct ieee80211_sta_rx_stats *last_rxstats;
2103
2104 last_rxstats = sta_get_last_rx_stats(sta);
2105
2106 sinfo->generation = sdata->local->sta_generation;
2107
2108 /* do before driver, so beacon filtering drivers have a
2109 * chance to e.g. just add the number of filtered beacons
2110 * (or just modify the value entirely, of course)
2111 */
2112 if (sdata->vif.type == NL80211_IFTYPE_STATION)
2113 sinfo->rx_beacon = sdata->u.mgd.count_beacon_signal;
2114
2115 drv_sta_statistics(local, sdata, &sta->sta, sinfo);
2116
2117 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_INACTIVE_TIME) |
2118 BIT_ULL(NL80211_STA_INFO_STA_FLAGS) |
2119 BIT_ULL(NL80211_STA_INFO_BSS_PARAM) |
2120 BIT_ULL(NL80211_STA_INFO_CONNECTED_TIME) |
2121 BIT_ULL(NL80211_STA_INFO_RX_DROP_MISC);
2122
2123 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2124 sinfo->beacon_loss_count = sdata->u.mgd.beacon_loss_count;
2125 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_BEACON_LOSS);
2126 }
2127
2128 sinfo->connected_time = ktime_get_seconds() - sta->last_connected;
2129 sinfo->inactive_time =
2130 jiffies_to_msecs(jiffies - ieee80211_sta_last_active(sta));
2131
2132 if (!(sinfo->filled & (BIT_ULL(NL80211_STA_INFO_TX_BYTES64) |
2133 BIT_ULL(NL80211_STA_INFO_TX_BYTES)))) {
2134 sinfo->tx_bytes = 0;
2135 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
2136 sinfo->tx_bytes += sta->tx_stats.bytes[ac];
2137 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_TX_BYTES64);
2138 }
2139
2140 if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_TX_PACKETS))) {
2141 sinfo->tx_packets = 0;
2142 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
2143 sinfo->tx_packets += sta->tx_stats.packets[ac];
2144 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_TX_PACKETS);
2145 }
2146
2147 if (!(sinfo->filled & (BIT_ULL(NL80211_STA_INFO_RX_BYTES64) |
2148 BIT_ULL(NL80211_STA_INFO_RX_BYTES)))) {
2149 sinfo->rx_bytes += sta_get_stats_bytes(&sta->rx_stats);
2150
2151 if (sta->pcpu_rx_stats) {
2152 for_each_possible_cpu(cpu) {
2153 struct ieee80211_sta_rx_stats *cpurxs;
2154
2155 cpurxs = per_cpu_ptr(sta->pcpu_rx_stats, cpu);
2156 sinfo->rx_bytes += sta_get_stats_bytes(cpurxs);
2157 }
2158 }
2159
2160 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_RX_BYTES64);
2161 }
2162
2163 if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_RX_PACKETS))) {
2164 sinfo->rx_packets = sta->rx_stats.packets;
2165 if (sta->pcpu_rx_stats) {
2166 for_each_possible_cpu(cpu) {
2167 struct ieee80211_sta_rx_stats *cpurxs;
2168
2169 cpurxs = per_cpu_ptr(sta->pcpu_rx_stats, cpu);
2170 sinfo->rx_packets += cpurxs->packets;
2171 }
2172 }
2173 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_RX_PACKETS);
2174 }
2175
2176 if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_TX_RETRIES))) {
2177 sinfo->tx_retries = sta->status_stats.retry_count;
2178 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_TX_RETRIES);
2179 }
2180
2181 if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_TX_FAILED))) {
2182 sinfo->tx_failed = sta->status_stats.retry_failed;
2183 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_TX_FAILED);
2184 }
2185
2186 sinfo->rx_dropped_misc = sta->rx_stats.dropped;
2187 if (sta->pcpu_rx_stats) {
2188 for_each_possible_cpu(cpu) {
2189 struct ieee80211_sta_rx_stats *cpurxs;
2190
2191 cpurxs = per_cpu_ptr(sta->pcpu_rx_stats, cpu);
2192 sinfo->rx_dropped_misc += cpurxs->dropped;
2193 }
2194 }
2195
2196 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2197 !(sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)) {
2198 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_BEACON_RX) |
2199 BIT_ULL(NL80211_STA_INFO_BEACON_SIGNAL_AVG);
2200 sinfo->rx_beacon_signal_avg = ieee80211_ave_rssi(&sdata->vif);
2201 }
2202
2203 if (ieee80211_hw_check(&sta->local->hw, SIGNAL_DBM) ||
2204 ieee80211_hw_check(&sta->local->hw, SIGNAL_UNSPEC)) {
2205 if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_SIGNAL))) {
2206 sinfo->signal = (s8)last_rxstats->last_signal;
2207 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_SIGNAL);
2208 }
2209
2210 if (!sta->pcpu_rx_stats &&
2211 !(sinfo->filled & BIT_ULL(NL80211_STA_INFO_SIGNAL_AVG))) {
2212 sinfo->signal_avg =
2213 -ewma_signal_read(&sta->rx_stats_avg.signal);
2214 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_SIGNAL_AVG);
2215 }
2216 }
2217
2218 /* for the average - if pcpu_rx_stats isn't set - rxstats must point to
2219 * the sta->rx_stats struct, so the check here is fine with and without
2220 * pcpu statistics
2221 */
2222 if (last_rxstats->chains &&
2223 !(sinfo->filled & (BIT_ULL(NL80211_STA_INFO_CHAIN_SIGNAL) |
2224 BIT_ULL(NL80211_STA_INFO_CHAIN_SIGNAL_AVG)))) {
2225 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_CHAIN_SIGNAL);
2226 if (!sta->pcpu_rx_stats)
2227 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_CHAIN_SIGNAL_AVG);
2228
2229 sinfo->chains = last_rxstats->chains;
2230
2231 for (i = 0; i < ARRAY_SIZE(sinfo->chain_signal); i++) {
2232 sinfo->chain_signal[i] =
2233 last_rxstats->chain_signal_last[i];
2234 sinfo->chain_signal_avg[i] =
2235 -ewma_signal_read(&sta->rx_stats_avg.chain_signal[i]);
2236 }
2237 }
2238
2239 if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_TX_BITRATE))) {
2240 sta_set_rate_info_tx(sta, &sta->tx_stats.last_rate,
2241 &sinfo->txrate);
2242 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_TX_BITRATE);
2243 }
2244
2245 if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_RX_BITRATE))) {
2246 if (sta_set_rate_info_rx(sta, &sinfo->rxrate) == 0)
2247 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_RX_BITRATE);
2248 }
2249
2250 if (tidstats && !cfg80211_sinfo_alloc_tid_stats(sinfo, GFP_KERNEL)) {
2251 for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) {
2252 struct cfg80211_tid_stats *tidstats = &sinfo->pertid[i];
2253
2254 sta_set_tidstats(sta, tidstats, i);
2255 }
2256 }
2257
2258 if (ieee80211_vif_is_mesh(&sdata->vif)) {
2259 #ifdef CONFIG_MAC80211_MESH
2260 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_LLID) |
2261 BIT_ULL(NL80211_STA_INFO_PLID) |
2262 BIT_ULL(NL80211_STA_INFO_PLINK_STATE) |
2263 BIT_ULL(NL80211_STA_INFO_LOCAL_PM) |
2264 BIT_ULL(NL80211_STA_INFO_PEER_PM) |
2265 BIT_ULL(NL80211_STA_INFO_NONPEER_PM);
2266
2267 sinfo->llid = sta->mesh->llid;
2268 sinfo->plid = sta->mesh->plid;
2269 sinfo->plink_state = sta->mesh->plink_state;
2270 if (test_sta_flag(sta, WLAN_STA_TOFFSET_KNOWN)) {
2271 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_T_OFFSET);
2272 sinfo->t_offset = sta->mesh->t_offset;
2273 }
2274 sinfo->local_pm = sta->mesh->local_pm;
2275 sinfo->peer_pm = sta->mesh->peer_pm;
2276 sinfo->nonpeer_pm = sta->mesh->nonpeer_pm;
2277 #endif
2278 }
2279
2280 sinfo->bss_param.flags = 0;
2281 if (sdata->vif.bss_conf.use_cts_prot)
2282 sinfo->bss_param.flags |= BSS_PARAM_FLAGS_CTS_PROT;
2283 if (sdata->vif.bss_conf.use_short_preamble)
2284 sinfo->bss_param.flags |= BSS_PARAM_FLAGS_SHORT_PREAMBLE;
2285 if (sdata->vif.bss_conf.use_short_slot)
2286 sinfo->bss_param.flags |= BSS_PARAM_FLAGS_SHORT_SLOT_TIME;
2287 sinfo->bss_param.dtim_period = sdata->vif.bss_conf.dtim_period;
2288 sinfo->bss_param.beacon_interval = sdata->vif.bss_conf.beacon_int;
2289
2290 sinfo->sta_flags.set = 0;
2291 sinfo->sta_flags.mask = BIT(NL80211_STA_FLAG_AUTHORIZED) |
2292 BIT(NL80211_STA_FLAG_SHORT_PREAMBLE) |
2293 BIT(NL80211_STA_FLAG_WME) |
2294 BIT(NL80211_STA_FLAG_MFP) |
2295 BIT(NL80211_STA_FLAG_AUTHENTICATED) |
2296 BIT(NL80211_STA_FLAG_ASSOCIATED) |
2297 BIT(NL80211_STA_FLAG_TDLS_PEER);
2298 if (test_sta_flag(sta, WLAN_STA_AUTHORIZED))
2299 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_AUTHORIZED);
2300 if (test_sta_flag(sta, WLAN_STA_SHORT_PREAMBLE))
2301 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_SHORT_PREAMBLE);
2302 if (sta->sta.wme)
2303 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_WME);
2304 if (test_sta_flag(sta, WLAN_STA_MFP))
2305 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_MFP);
2306 if (test_sta_flag(sta, WLAN_STA_AUTH))
2307 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_AUTHENTICATED);
2308 if (test_sta_flag(sta, WLAN_STA_ASSOC))
2309 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_ASSOCIATED);
2310 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER))
2311 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_TDLS_PEER);
2312
2313 thr = sta_get_expected_throughput(sta);
2314
2315 if (thr != 0) {
2316 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_EXPECTED_THROUGHPUT);
2317 sinfo->expected_throughput = thr;
2318 }
2319
2320 if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_ACK_SIGNAL)) &&
2321 sta->status_stats.ack_signal_filled) {
2322 sinfo->ack_signal = sta->status_stats.last_ack_signal;
2323 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_ACK_SIGNAL);
2324 }
2325
2326 if (ieee80211_hw_check(&sta->local->hw, REPORTS_TX_ACK_STATUS) &&
2327 !(sinfo->filled & BIT_ULL(NL80211_STA_INFO_DATA_ACK_SIGNAL_AVG))) {
2328 sinfo->avg_ack_signal =
2329 -(s8)ewma_avg_signal_read(
2330 &sta->status_stats.avg_ack_signal);
2331 sinfo->filled |=
2332 BIT_ULL(NL80211_STA_INFO_DATA_ACK_SIGNAL_AVG);
2333 }
2334 }
2335
2336 u32 sta_get_expected_throughput(struct sta_info *sta)
2337 {
2338 struct ieee80211_sub_if_data *sdata = sta->sdata;
2339 struct ieee80211_local *local = sdata->local;
2340 struct rate_control_ref *ref = NULL;
2341 u32 thr = 0;
2342
2343 if (test_sta_flag(sta, WLAN_STA_RATE_CONTROL))
2344 ref = local->rate_ctrl;
2345
2346 /* check if the driver has a SW RC implementation */
2347 if (ref && ref->ops->get_expected_throughput)
2348 thr = ref->ops->get_expected_throughput(sta->rate_ctrl_priv);
2349 else
2350 thr = drv_get_expected_throughput(local, sta);
2351
2352 return thr;
2353 }
2354
2355 unsigned long ieee80211_sta_last_active(struct sta_info *sta)
2356 {
2357 struct ieee80211_sta_rx_stats *stats = sta_get_last_rx_stats(sta);
2358
2359 if (time_after(stats->last_rx, sta->status_stats.last_ack))
2360 return stats->last_rx;
2361 return sta->status_stats.last_ack;
2362 }
2363
2364 static void sta_update_codel_params(struct sta_info *sta, u32 thr)
2365 {
2366 if (!sta->sdata->local->ops->wake_tx_queue)
2367 return;
2368
2369 if (thr && thr < STA_SLOW_THRESHOLD * sta->local->num_sta) {
2370 sta->cparams.target = MS2TIME(50);
2371 sta->cparams.interval = MS2TIME(300);
2372 sta->cparams.ecn = false;
2373 } else {
2374 sta->cparams.target = MS2TIME(20);
2375 sta->cparams.interval = MS2TIME(100);
2376 sta->cparams.ecn = true;
2377 }
2378 }
2379
2380 void ieee80211_sta_set_expected_throughput(struct ieee80211_sta *pubsta,
2381 u32 thr)
2382 {
2383 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
2384
2385 sta_update_codel_params(sta, thr);
2386 }
Linux with added FPC-III support