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drm/i915: fix port checks for MST support on gen >= 11
[linux/fpc-iii.git] / net / mac80211 / sta_info.c
blobec2e83272f9d87afa5af99ecc6c52d7012b12590
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) 2018-2020 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 while (sta->sta_state == IEEE80211_STA_AUTHORIZED) {
983 ret = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
984 WARN_ON_ONCE(ret);
985 }
986
987 /* now keys can no longer be reached */
988 ieee80211_free_sta_keys(local, sta);
989
990 /* disable TIM bit - last chance to tell driver */
991 __sta_info_recalc_tim(sta, true);
992
993 sta->dead = true;
994
995 local->num_sta--;
996 local->sta_generation++;
997
998 while (sta->sta_state > IEEE80211_STA_NONE) {
999 ret = sta_info_move_state(sta, sta->sta_state - 1);
1000 if (ret) {
1001 WARN_ON_ONCE(1);
1002 break;
1003 }
1004 }
1005
1006 if (sta->uploaded) {
1007 ret = drv_sta_state(local, sdata, sta, IEEE80211_STA_NONE,
1008 IEEE80211_STA_NOTEXIST);
1009 WARN_ON_ONCE(ret != 0);
1010 }
1011
1012 sta_dbg(sdata, "Removed STA %pM\n", sta->sta.addr);
1013
1014 sinfo = kzalloc(sizeof(*sinfo), GFP_KERNEL);
1015 if (sinfo)
1016 sta_set_sinfo(sta, sinfo, true);
1017 cfg80211_del_sta_sinfo(sdata->dev, sta->sta.addr, sinfo, GFP_KERNEL);
1018 kfree(sinfo);
1019
1020 rate_control_remove_sta_debugfs(sta);
1021 ieee80211_sta_debugfs_remove(sta);
1022
1023 cleanup_single_sta(sta);
1024 }
1025
1026 int __must_check __sta_info_destroy(struct sta_info *sta)
1027 {
1028 int err = __sta_info_destroy_part1(sta);
1029
1030 if (err)
1031 return err;
1032
1033 synchronize_net();
1034
1035 __sta_info_destroy_part2(sta);
1036
1037 return 0;
1038 }
1039
1040 int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, const u8 *addr)
1041 {
1042 struct sta_info *sta;
1043 int ret;
1044
1045 mutex_lock(&sdata->local->sta_mtx);
1046 sta = sta_info_get(sdata, addr);
1047 ret = __sta_info_destroy(sta);
1048 mutex_unlock(&sdata->local->sta_mtx);
1049
1050 return ret;
1051 }
1052
1053 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
1054 const u8 *addr)
1055 {
1056 struct sta_info *sta;
1057 int ret;
1058
1059 mutex_lock(&sdata->local->sta_mtx);
1060 sta = sta_info_get_bss(sdata, addr);
1061 ret = __sta_info_destroy(sta);
1062 mutex_unlock(&sdata->local->sta_mtx);
1063
1064 return ret;
1065 }
1066
1067 static void sta_info_cleanup(struct timer_list *t)
1068 {
1069 struct ieee80211_local *local = from_timer(local, t, sta_cleanup);
1070 struct sta_info *sta;
1071 bool timer_needed = false;
1072
1073 rcu_read_lock();
1074 list_for_each_entry_rcu(sta, &local->sta_list, list)
1075 if (sta_info_cleanup_expire_buffered(local, sta))
1076 timer_needed = true;
1077 rcu_read_unlock();
1078
1079 if (local->quiescing)
1080 return;
1081
1082 if (!timer_needed)
1083 return;
1084
1085 mod_timer(&local->sta_cleanup,
1086 round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL));
1087 }
1088
1089 int sta_info_init(struct ieee80211_local *local)
1090 {
1091 int err;
1092
1093 err = rhltable_init(&local->sta_hash, &sta_rht_params);
1094 if (err)
1095 return err;
1096
1097 spin_lock_init(&local->tim_lock);
1098 mutex_init(&local->sta_mtx);
1099 INIT_LIST_HEAD(&local->sta_list);
1100
1101 timer_setup(&local->sta_cleanup, sta_info_cleanup, 0);
1102 return 0;
1103 }
1104
1105 void sta_info_stop(struct ieee80211_local *local)
1106 {
1107 del_timer_sync(&local->sta_cleanup);
1108 rhltable_destroy(&local->sta_hash);
1109 }
1110
1111
1112 int __sta_info_flush(struct ieee80211_sub_if_data *sdata, bool vlans)
1113 {
1114 struct ieee80211_local *local = sdata->local;
1115 struct sta_info *sta, *tmp;
1116 LIST_HEAD(free_list);
1117 int ret = 0;
1118
1119 might_sleep();
1120
1121 WARN_ON(vlans && sdata->vif.type != NL80211_IFTYPE_AP);
1122 WARN_ON(vlans && !sdata->bss);
1123
1124 mutex_lock(&local->sta_mtx);
1125 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1126 if (sdata == sta->sdata ||
1127 (vlans && sdata->bss == sta->sdata->bss)) {
1128 if (!WARN_ON(__sta_info_destroy_part1(sta)))
1129 list_add(&sta->free_list, &free_list);
1130 ret++;
1131 }
1132 }
1133
1134 if (!list_empty(&free_list)) {
1135 synchronize_net();
1136 list_for_each_entry_safe(sta, tmp, &free_list, free_list)
1137 __sta_info_destroy_part2(sta);
1138 }
1139 mutex_unlock(&local->sta_mtx);
1140
1141 return ret;
1142 }
1143
1144 void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
1145 unsigned long exp_time)
1146 {
1147 struct ieee80211_local *local = sdata->local;
1148 struct sta_info *sta, *tmp;
1149
1150 mutex_lock(&local->sta_mtx);
1151
1152 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1153 unsigned long last_active = ieee80211_sta_last_active(sta);
1154
1155 if (sdata != sta->sdata)
1156 continue;
1157
1158 if (time_is_before_jiffies(last_active + exp_time)) {
1159 sta_dbg(sta->sdata, "expiring inactive STA %pM\n",
1160 sta->sta.addr);
1161
1162 if (ieee80211_vif_is_mesh(&sdata->vif) &&
1163 test_sta_flag(sta, WLAN_STA_PS_STA))
1164 atomic_dec(&sdata->u.mesh.ps.num_sta_ps);
1165
1166 WARN_ON(__sta_info_destroy(sta));
1167 }
1168 }
1169
1170 mutex_unlock(&local->sta_mtx);
1171 }
1172
1173 struct ieee80211_sta *ieee80211_find_sta_by_ifaddr(struct ieee80211_hw *hw,
1174 const u8 *addr,
1175 const u8 *localaddr)
1176 {
1177 struct ieee80211_local *local = hw_to_local(hw);
1178 struct rhlist_head *tmp;
1179 struct sta_info *sta;
1180
1181 /*
1182 * Just return a random station if localaddr is NULL
1183 * ... first in list.
1184 */
1185 for_each_sta_info(local, addr, sta, tmp) {
1186 if (localaddr &&
1187 !ether_addr_equal(sta->sdata->vif.addr, localaddr))
1188 continue;
1189 if (!sta->uploaded)
1190 return NULL;
1191 return &sta->sta;
1192 }
1193
1194 return NULL;
1195 }
1196 EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr);
1197
1198 struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif,
1199 const u8 *addr)
1200 {
1201 struct sta_info *sta;
1202
1203 if (!vif)
1204 return NULL;
1205
1206 sta = sta_info_get_bss(vif_to_sdata(vif), addr);
1207 if (!sta)
1208 return NULL;
1209
1210 if (!sta->uploaded)
1211 return NULL;
1212
1213 return &sta->sta;
1214 }
1215 EXPORT_SYMBOL(ieee80211_find_sta);
1216
1217 /* powersave support code */
1218 void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta)
1219 {
1220 struct ieee80211_sub_if_data *sdata = sta->sdata;
1221 struct ieee80211_local *local = sdata->local;
1222 struct sk_buff_head pending;
1223 int filtered = 0, buffered = 0, ac, i;
1224 unsigned long flags;
1225 struct ps_data *ps;
1226
1227 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1228 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
1229 u.ap);
1230
1231 if (sdata->vif.type == NL80211_IFTYPE_AP)
1232 ps = &sdata->bss->ps;
1233 else if (ieee80211_vif_is_mesh(&sdata->vif))
1234 ps = &sdata->u.mesh.ps;
1235 else
1236 return;
1237
1238 clear_sta_flag(sta, WLAN_STA_SP);
1239
1240 BUILD_BUG_ON(BITS_TO_LONGS(IEEE80211_NUM_TIDS) > 1);
1241 sta->driver_buffered_tids = 0;
1242 sta->txq_buffered_tids = 0;
1243
1244 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
1245 drv_sta_notify(local, sdata, STA_NOTIFY_AWAKE, &sta->sta);
1246
1247 if (sta->sta.txq[0]) {
1248 for (i = 0; i < ARRAY_SIZE(sta->sta.txq); i++) {
1249 if (!txq_has_queue(sta->sta.txq[i]))
1250 continue;
1251
1252 drv_wake_tx_queue(local, to_txq_info(sta->sta.txq[i]));
1253 }
1254 }
1255
1256 skb_queue_head_init(&pending);
1257
1258 /* sync with ieee80211_tx_h_unicast_ps_buf */
1259 spin_lock(&sta->ps_lock);
1260 /* Send all buffered frames to the station */
1261 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1262 int count = skb_queue_len(&pending), tmp;
1263
1264 spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
1265 skb_queue_splice_tail_init(&sta->tx_filtered[ac], &pending);
1266 spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
1267 tmp = skb_queue_len(&pending);
1268 filtered += tmp - count;
1269 count = tmp;
1270
1271 spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
1272 skb_queue_splice_tail_init(&sta->ps_tx_buf[ac], &pending);
1273 spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
1274 tmp = skb_queue_len(&pending);
1275 buffered += tmp - count;
1276 }
1277
1278 ieee80211_add_pending_skbs(local, &pending);
1279
1280 /* now we're no longer in the deliver code */
1281 clear_sta_flag(sta, WLAN_STA_PS_DELIVER);
1282
1283 /* The station might have polled and then woken up before we responded,
1284 * so clear these flags now to avoid them sticking around.
1285 */
1286 clear_sta_flag(sta, WLAN_STA_PSPOLL);
1287 clear_sta_flag(sta, WLAN_STA_UAPSD);
1288 spin_unlock(&sta->ps_lock);
1289
1290 atomic_dec(&ps->num_sta_ps);
1291
1292 /* This station just woke up and isn't aware of our SMPS state */
1293 if (!ieee80211_vif_is_mesh(&sdata->vif) &&
1294 !ieee80211_smps_is_restrictive(sta->known_smps_mode,
1295 sdata->smps_mode) &&
1296 sta->known_smps_mode != sdata->bss->req_smps &&
1297 sta_info_tx_streams(sta) != 1) {
1298 ht_dbg(sdata,
1299 "%pM just woke up and MIMO capable - update SMPS\n",
1300 sta->sta.addr);
1301 ieee80211_send_smps_action(sdata, sdata->bss->req_smps,
1302 sta->sta.addr,
1303 sdata->vif.bss_conf.bssid);
1304 }
1305
1306 local->total_ps_buffered -= buffered;
1307
1308 sta_info_recalc_tim(sta);
1309
1310 ps_dbg(sdata,
1311 "STA %pM aid %d sending %d filtered/%d PS frames since STA woke up\n",
1312 sta->sta.addr, sta->sta.aid, filtered, buffered);
1313
1314 ieee80211_check_fast_xmit(sta);
1315 }
1316
1317 static void ieee80211_send_null_response(struct sta_info *sta, int tid,
1318 enum ieee80211_frame_release_type reason,
1319 bool call_driver, bool more_data)
1320 {
1321 struct ieee80211_sub_if_data *sdata = sta->sdata;
1322 struct ieee80211_local *local = sdata->local;
1323 struct ieee80211_qos_hdr *nullfunc;
1324 struct sk_buff *skb;
1325 int size = sizeof(*nullfunc);
1326 __le16 fc;
1327 bool qos = sta->sta.wme;
1328 struct ieee80211_tx_info *info;
1329 struct ieee80211_chanctx_conf *chanctx_conf;
1330
1331 /* Don't send NDPs when STA is connected HE */
1332 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1333 !(sdata->u.mgd.flags & IEEE80211_STA_DISABLE_HE))
1334 return;
1335
1336 if (qos) {
1337 fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1338 IEEE80211_STYPE_QOS_NULLFUNC |
1339 IEEE80211_FCTL_FROMDS);
1340 } else {
1341 size -= 2;
1342 fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1343 IEEE80211_STYPE_NULLFUNC |
1344 IEEE80211_FCTL_FROMDS);
1345 }
1346
1347 skb = dev_alloc_skb(local->hw.extra_tx_headroom + size);
1348 if (!skb)
1349 return;
1350
1351 skb_reserve(skb, local->hw.extra_tx_headroom);
1352
1353 nullfunc = skb_put(skb, size);
1354 nullfunc->frame_control = fc;
1355 nullfunc->duration_id = 0;
1356 memcpy(nullfunc->addr1, sta->sta.addr, ETH_ALEN);
1357 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
1358 memcpy(nullfunc->addr3, sdata->vif.addr, ETH_ALEN);
1359 nullfunc->seq_ctrl = 0;
1360
1361 skb->priority = tid;
1362 skb_set_queue_mapping(skb, ieee802_1d_to_ac[tid]);
1363 if (qos) {
1364 nullfunc->qos_ctrl = cpu_to_le16(tid);
1365
1366 if (reason == IEEE80211_FRAME_RELEASE_UAPSD) {
1367 nullfunc->qos_ctrl |=
1368 cpu_to_le16(IEEE80211_QOS_CTL_EOSP);
1369 if (more_data)
1370 nullfunc->frame_control |=
1371 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1372 }
1373 }
1374
1375 info = IEEE80211_SKB_CB(skb);
1376
1377 /*
1378 * Tell TX path to send this frame even though the
1379 * STA may still remain is PS mode after this frame
1380 * exchange. Also set EOSP to indicate this packet
1381 * ends the poll/service period.
1382 */
1383 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER |
1384 IEEE80211_TX_STATUS_EOSP |
1385 IEEE80211_TX_CTL_REQ_TX_STATUS;
1386
1387 info->control.flags |= IEEE80211_TX_CTRL_PS_RESPONSE;
1388
1389 if (call_driver)
1390 drv_allow_buffered_frames(local, sta, BIT(tid), 1,
1391 reason, false);
1392
1393 skb->dev = sdata->dev;
1394
1395 rcu_read_lock();
1396 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1397 if (WARN_ON(!chanctx_conf)) {
1398 rcu_read_unlock();
1399 kfree_skb(skb);
1400 return;
1401 }
1402
1403 info->band = chanctx_conf->def.chan->band;
1404 ieee80211_xmit(sdata, sta, skb, 0);
1405 rcu_read_unlock();
1406 }
1407
1408 static int find_highest_prio_tid(unsigned long tids)
1409 {
1410 /* lower 3 TIDs aren't ordered perfectly */
1411 if (tids & 0xF8)
1412 return fls(tids) - 1;
1413 /* TID 0 is BE just like TID 3 */
1414 if (tids & BIT(0))
1415 return 0;
1416 return fls(tids) - 1;
1417 }
1418
1419 /* Indicates if the MORE_DATA bit should be set in the last
1420 * frame obtained by ieee80211_sta_ps_get_frames.
1421 * Note that driver_release_tids is relevant only if
1422 * reason = IEEE80211_FRAME_RELEASE_PSPOLL
1423 */
1424 static bool
1425 ieee80211_sta_ps_more_data(struct sta_info *sta, u8 ignored_acs,
1426 enum ieee80211_frame_release_type reason,
1427 unsigned long driver_release_tids)
1428 {
1429 int ac;
1430
1431 /* If the driver has data on more than one TID then
1432 * certainly there's more data if we release just a
1433 * single frame now (from a single TID). This will
1434 * only happen for PS-Poll.
1435 */
1436 if (reason == IEEE80211_FRAME_RELEASE_PSPOLL &&
1437 hweight16(driver_release_tids) > 1)
1438 return true;
1439
1440 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1441 if (ignored_acs & ieee80211_ac_to_qos_mask[ac])
1442 continue;
1443
1444 if (!skb_queue_empty(&sta->tx_filtered[ac]) ||
1445 !skb_queue_empty(&sta->ps_tx_buf[ac]))
1446 return true;
1447 }
1448
1449 return false;
1450 }
1451
1452 static void
1453 ieee80211_sta_ps_get_frames(struct sta_info *sta, int n_frames, u8 ignored_acs,
1454 enum ieee80211_frame_release_type reason,
1455 struct sk_buff_head *frames,
1456 unsigned long *driver_release_tids)
1457 {
1458 struct ieee80211_sub_if_data *sdata = sta->sdata;
1459 struct ieee80211_local *local = sdata->local;
1460 int ac;
1461
1462 /* Get response frame(s) and more data bit for the last one. */
1463 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1464 unsigned long tids;
1465
1466 if (ignored_acs & ieee80211_ac_to_qos_mask[ac])
1467 continue;
1468
1469 tids = ieee80211_tids_for_ac(ac);
1470
1471 /* if we already have frames from software, then we can't also
1472 * release from hardware queues
1473 */
1474 if (skb_queue_empty(frames)) {
1475 *driver_release_tids |=
1476 sta->driver_buffered_tids & tids;
1477 *driver_release_tids |= sta->txq_buffered_tids & tids;
1478 }
1479
1480 if (!*driver_release_tids) {
1481 struct sk_buff *skb;
1482
1483 while (n_frames > 0) {
1484 skb = skb_dequeue(&sta->tx_filtered[ac]);
1485 if (!skb) {
1486 skb = skb_dequeue(
1487 &sta->ps_tx_buf[ac]);
1488 if (skb)
1489 local->total_ps_buffered--;
1490 }
1491 if (!skb)
1492 break;
1493 n_frames--;
1494 __skb_queue_tail(frames, skb);
1495 }
1496 }
1497
1498 /* If we have more frames buffered on this AC, then abort the
1499 * loop since we can't send more data from other ACs before
1500 * the buffered frames from this.
1501 */
1502 if (!skb_queue_empty(&sta->tx_filtered[ac]) ||
1503 !skb_queue_empty(&sta->ps_tx_buf[ac]))
1504 break;
1505 }
1506 }
1507
1508 static void
1509 ieee80211_sta_ps_deliver_response(struct sta_info *sta,
1510 int n_frames, u8 ignored_acs,
1511 enum ieee80211_frame_release_type reason)
1512 {
1513 struct ieee80211_sub_if_data *sdata = sta->sdata;
1514 struct ieee80211_local *local = sdata->local;
1515 unsigned long driver_release_tids = 0;
1516 struct sk_buff_head frames;
1517 bool more_data;
1518
1519 /* Service or PS-Poll period starts */
1520 set_sta_flag(sta, WLAN_STA_SP);
1521
1522 __skb_queue_head_init(&frames);
1523
1524 ieee80211_sta_ps_get_frames(sta, n_frames, ignored_acs, reason,
1525 &frames, &driver_release_tids);
1526
1527 more_data = ieee80211_sta_ps_more_data(sta, ignored_acs, reason, driver_release_tids);
1528
1529 if (driver_release_tids && reason == IEEE80211_FRAME_RELEASE_PSPOLL)
1530 driver_release_tids =
1531 BIT(find_highest_prio_tid(driver_release_tids));
1532
1533 if (skb_queue_empty(&frames) && !driver_release_tids) {
1534 int tid, ac;
1535
1536 /*
1537 * For PS-Poll, this can only happen due to a race condition
1538 * when we set the TIM bit and the station notices it, but
1539 * before it can poll for the frame we expire it.
1540 *
1541 * For uAPSD, this is said in the standard (11.2.1.5 h):
1542 * At each unscheduled SP for a non-AP STA, the AP shall
1543 * attempt to transmit at least one MSDU or MMPDU, but no
1544 * more than the value specified in the Max SP Length field
1545 * in the QoS Capability element from delivery-enabled ACs,
1546 * that are destined for the non-AP STA.
1547 *
1548 * Since we have no other MSDU/MMPDU, transmit a QoS null frame.
1549 */
1550
1551 /* This will evaluate to 1, 3, 5 or 7. */
1552 for (ac = IEEE80211_AC_VO; ac < IEEE80211_NUM_ACS; ac++)
1553 if (!(ignored_acs & ieee80211_ac_to_qos_mask[ac]))
1554 break;
1555 tid = 7 - 2 * ac;
1556
1557 ieee80211_send_null_response(sta, tid, reason, true, false);
1558 } else if (!driver_release_tids) {
1559 struct sk_buff_head pending;
1560 struct sk_buff *skb;
1561 int num = 0;
1562 u16 tids = 0;
1563 bool need_null = false;
1564
1565 skb_queue_head_init(&pending);
1566
1567 while ((skb = __skb_dequeue(&frames))) {
1568 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1569 struct ieee80211_hdr *hdr = (void *) skb->data;
1570 u8 *qoshdr = NULL;
1571
1572 num++;
1573
1574 /*
1575 * Tell TX path to send this frame even though the
1576 * STA may still remain is PS mode after this frame
1577 * exchange.
1578 */
1579 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
1580 info->control.flags |= IEEE80211_TX_CTRL_PS_RESPONSE;
1581
1582 /*
1583 * Use MoreData flag to indicate whether there are
1584 * more buffered frames for this STA
1585 */
1586 if (more_data || !skb_queue_empty(&frames))
1587 hdr->frame_control |=
1588 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1589 else
1590 hdr->frame_control &=
1591 cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
1592
1593 if (ieee80211_is_data_qos(hdr->frame_control) ||
1594 ieee80211_is_qos_nullfunc(hdr->frame_control))
1595 qoshdr = ieee80211_get_qos_ctl(hdr);
1596
1597 tids |= BIT(skb->priority);
1598
1599 __skb_queue_tail(&pending, skb);
1600
1601 /* end service period after last frame or add one */
1602 if (!skb_queue_empty(&frames))
1603 continue;
1604
1605 if (reason != IEEE80211_FRAME_RELEASE_UAPSD) {
1606 /* for PS-Poll, there's only one frame */
1607 info->flags |= IEEE80211_TX_STATUS_EOSP |
1608 IEEE80211_TX_CTL_REQ_TX_STATUS;
1609 break;
1610 }
1611
1612 /* For uAPSD, things are a bit more complicated. If the
1613 * last frame has a QoS header (i.e. is a QoS-data or
1614 * QoS-nulldata frame) then just set the EOSP bit there
1615 * and be done.
1616 * If the frame doesn't have a QoS header (which means
1617 * it should be a bufferable MMPDU) then we can't set
1618 * the EOSP bit in the QoS header; add a QoS-nulldata
1619 * frame to the list to send it after the MMPDU.
1620 *
1621 * Note that this code is only in the mac80211-release
1622 * code path, we assume that the driver will not buffer
1623 * anything but QoS-data frames, or if it does, will
1624 * create the QoS-nulldata frame by itself if needed.
1625 *
1626 * Cf. 802.11-2012 10.2.1.10 (c).
1627 */
1628 if (qoshdr) {
1629 *qoshdr |= IEEE80211_QOS_CTL_EOSP;
1630
1631 info->flags |= IEEE80211_TX_STATUS_EOSP |
1632 IEEE80211_TX_CTL_REQ_TX_STATUS;
1633 } else {
1634 /* The standard isn't completely clear on this
1635 * as it says the more-data bit should be set
1636 * if there are more BUs. The QoS-Null frame
1637 * we're about to send isn't buffered yet, we
1638 * only create it below, but let's pretend it
1639 * was buffered just in case some clients only
1640 * expect more-data=0 when eosp=1.
1641 */
1642 hdr->frame_control |=
1643 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1644 need_null = true;
1645 num++;
1646 }
1647 break;
1648 }
1649
1650 drv_allow_buffered_frames(local, sta, tids, num,
1651 reason, more_data);
1652
1653 ieee80211_add_pending_skbs(local, &pending);
1654
1655 if (need_null)
1656 ieee80211_send_null_response(
1657 sta, find_highest_prio_tid(tids),
1658 reason, false, false);
1659
1660 sta_info_recalc_tim(sta);
1661 } else {
1662 int tid;
1663
1664 /*
1665 * We need to release a frame that is buffered somewhere in the
1666 * driver ... it'll have to handle that.
1667 * Note that the driver also has to check the number of frames
1668 * on the TIDs we're releasing from - if there are more than
1669 * n_frames it has to set the more-data bit (if we didn't ask
1670 * it to set it anyway due to other buffered frames); if there
1671 * are fewer than n_frames it has to make sure to adjust that
1672 * to allow the service period to end properly.
1673 */
1674 drv_release_buffered_frames(local, sta, driver_release_tids,
1675 n_frames, reason, more_data);
1676
1677 /*
1678 * Note that we don't recalculate the TIM bit here as it would
1679 * most likely have no effect at all unless the driver told us
1680 * that the TID(s) became empty before returning here from the
1681 * release function.
1682 * Either way, however, when the driver tells us that the TID(s)
1683 * became empty or we find that a txq became empty, we'll do the
1684 * TIM recalculation.
1685 */
1686
1687 if (!sta->sta.txq[0])
1688 return;
1689
1690 for (tid = 0; tid < ARRAY_SIZE(sta->sta.txq); tid++) {
1691 if (!(driver_release_tids & BIT(tid)) ||
1692 txq_has_queue(sta->sta.txq[tid]))
1693 continue;
1694
1695 sta_info_recalc_tim(sta);
1696 break;
1697 }
1698 }
1699 }
1700
1701 void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta)
1702 {
1703 u8 ignore_for_response = sta->sta.uapsd_queues;
1704
1705 /*
1706 * If all ACs are delivery-enabled then we should reply
1707 * from any of them, if only some are enabled we reply
1708 * only from the non-enabled ones.
1709 */
1710 if (ignore_for_response == BIT(IEEE80211_NUM_ACS) - 1)
1711 ignore_for_response = 0;
1712
1713 ieee80211_sta_ps_deliver_response(sta, 1, ignore_for_response,
1714 IEEE80211_FRAME_RELEASE_PSPOLL);
1715 }
1716
1717 void ieee80211_sta_ps_deliver_uapsd(struct sta_info *sta)
1718 {
1719 int n_frames = sta->sta.max_sp;
1720 u8 delivery_enabled = sta->sta.uapsd_queues;
1721
1722 /*
1723 * If we ever grow support for TSPEC this might happen if
1724 * the TSPEC update from hostapd comes in between a trigger
1725 * frame setting WLAN_STA_UAPSD in the RX path and this
1726 * actually getting called.
1727 */
1728 if (!delivery_enabled)
1729 return;
1730
1731 switch (sta->sta.max_sp) {
1732 case 1:
1733 n_frames = 2;
1734 break;
1735 case 2:
1736 n_frames = 4;
1737 break;
1738 case 3:
1739 n_frames = 6;
1740 break;
1741 case 0:
1742 /* XXX: what is a good value? */
1743 n_frames = 128;
1744 break;
1745 }
1746
1747 ieee80211_sta_ps_deliver_response(sta, n_frames, ~delivery_enabled,
1748 IEEE80211_FRAME_RELEASE_UAPSD);
1749 }
1750
1751 void ieee80211_sta_block_awake(struct ieee80211_hw *hw,
1752 struct ieee80211_sta *pubsta, bool block)
1753 {
1754 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1755
1756 trace_api_sta_block_awake(sta->local, pubsta, block);
1757
1758 if (block) {
1759 set_sta_flag(sta, WLAN_STA_PS_DRIVER);
1760 ieee80211_clear_fast_xmit(sta);
1761 return;
1762 }
1763
1764 if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1765 return;
1766
1767 if (!test_sta_flag(sta, WLAN_STA_PS_STA)) {
1768 set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1769 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
1770 ieee80211_queue_work(hw, &sta->drv_deliver_wk);
1771 } else if (test_sta_flag(sta, WLAN_STA_PSPOLL) ||
1772 test_sta_flag(sta, WLAN_STA_UAPSD)) {
1773 /* must be asleep in this case */
1774 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
1775 ieee80211_queue_work(hw, &sta->drv_deliver_wk);
1776 } else {
1777 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
1778 ieee80211_check_fast_xmit(sta);
1779 }
1780 }
1781 EXPORT_SYMBOL(ieee80211_sta_block_awake);
1782
1783 void ieee80211_sta_eosp(struct ieee80211_sta *pubsta)
1784 {
1785 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1786 struct ieee80211_local *local = sta->local;
1787
1788 trace_api_eosp(local, pubsta);
1789
1790 clear_sta_flag(sta, WLAN_STA_SP);
1791 }
1792 EXPORT_SYMBOL(ieee80211_sta_eosp);
1793
1794 void ieee80211_send_eosp_nullfunc(struct ieee80211_sta *pubsta, int tid)
1795 {
1796 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1797 enum ieee80211_frame_release_type reason;
1798 bool more_data;
1799
1800 trace_api_send_eosp_nullfunc(sta->local, pubsta, tid);
1801
1802 reason = IEEE80211_FRAME_RELEASE_UAPSD;
1803 more_data = ieee80211_sta_ps_more_data(sta, ~sta->sta.uapsd_queues,
1804 reason, 0);
1805
1806 ieee80211_send_null_response(sta, tid, reason, false, more_data);
1807 }
1808 EXPORT_SYMBOL(ieee80211_send_eosp_nullfunc);
1809
1810 void ieee80211_sta_set_buffered(struct ieee80211_sta *pubsta,
1811 u8 tid, bool buffered)
1812 {
1813 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1814
1815 if (WARN_ON(tid >= IEEE80211_NUM_TIDS))
1816 return;
1817
1818 trace_api_sta_set_buffered(sta->local, pubsta, tid, buffered);
1819
1820 if (buffered)
1821 set_bit(tid, &sta->driver_buffered_tids);
1822 else
1823 clear_bit(tid, &sta->driver_buffered_tids);
1824
1825 sta_info_recalc_tim(sta);
1826 }
1827 EXPORT_SYMBOL(ieee80211_sta_set_buffered);
1828
1829 int sta_info_move_state(struct sta_info *sta,
1830 enum ieee80211_sta_state new_state)
1831 {
1832 might_sleep();
1833
1834 if (sta->sta_state == new_state)
1835 return 0;
1836
1837 /* check allowed transitions first */
1838
1839 switch (new_state) {
1840 case IEEE80211_STA_NONE:
1841 if (sta->sta_state != IEEE80211_STA_AUTH)
1842 return -EINVAL;
1843 break;
1844 case IEEE80211_STA_AUTH:
1845 if (sta->sta_state != IEEE80211_STA_NONE &&
1846 sta->sta_state != IEEE80211_STA_ASSOC)
1847 return -EINVAL;
1848 break;
1849 case IEEE80211_STA_ASSOC:
1850 if (sta->sta_state != IEEE80211_STA_AUTH &&
1851 sta->sta_state != IEEE80211_STA_AUTHORIZED)
1852 return -EINVAL;
1853 break;
1854 case IEEE80211_STA_AUTHORIZED:
1855 if (sta->sta_state != IEEE80211_STA_ASSOC)
1856 return -EINVAL;
1857 break;
1858 default:
1859 WARN(1, "invalid state %d", new_state);
1860 return -EINVAL;
1861 }
1862
1863 sta_dbg(sta->sdata, "moving STA %pM to state %d\n",
1864 sta->sta.addr, new_state);
1865
1866 /*
1867 * notify the driver before the actual changes so it can
1868 * fail the transition
1869 */
1870 if (test_sta_flag(sta, WLAN_STA_INSERTED)) {
1871 int err = drv_sta_state(sta->local, sta->sdata, sta,
1872 sta->sta_state, new_state);
1873 if (err)
1874 return err;
1875 }
1876
1877 /* reflect the change in all state variables */
1878
1879 switch (new_state) {
1880 case IEEE80211_STA_NONE:
1881 if (sta->sta_state == IEEE80211_STA_AUTH)
1882 clear_bit(WLAN_STA_AUTH, &sta->_flags);
1883 break;
1884 case IEEE80211_STA_AUTH:
1885 if (sta->sta_state == IEEE80211_STA_NONE) {
1886 set_bit(WLAN_STA_AUTH, &sta->_flags);
1887 } else if (sta->sta_state == IEEE80211_STA_ASSOC) {
1888 clear_bit(WLAN_STA_ASSOC, &sta->_flags);
1889 ieee80211_recalc_min_chandef(sta->sdata);
1890 if (!sta->sta.support_p2p_ps)
1891 ieee80211_recalc_p2p_go_ps_allowed(sta->sdata);
1892 }
1893 break;
1894 case IEEE80211_STA_ASSOC:
1895 if (sta->sta_state == IEEE80211_STA_AUTH) {
1896 set_bit(WLAN_STA_ASSOC, &sta->_flags);
1897 ieee80211_recalc_min_chandef(sta->sdata);
1898 if (!sta->sta.support_p2p_ps)
1899 ieee80211_recalc_p2p_go_ps_allowed(sta->sdata);
1900 } else if (sta->sta_state == IEEE80211_STA_AUTHORIZED) {
1901 ieee80211_vif_dec_num_mcast(sta->sdata);
1902 clear_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
1903 ieee80211_clear_fast_xmit(sta);
1904 ieee80211_clear_fast_rx(sta);
1905 }
1906 break;
1907 case IEEE80211_STA_AUTHORIZED:
1908 if (sta->sta_state == IEEE80211_STA_ASSOC) {
1909 ieee80211_vif_inc_num_mcast(sta->sdata);
1910 set_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
1911 ieee80211_check_fast_xmit(sta);
1912 ieee80211_check_fast_rx(sta);
1913 }
1914 if (sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1915 sta->sdata->vif.type == NL80211_IFTYPE_AP)
1916 cfg80211_send_layer2_update(sta->sdata->dev,
1917 sta->sta.addr);
1918 break;
1919 default:
1920 break;
1921 }
1922
1923 sta->sta_state = new_state;
1924
1925 return 0;
1926 }
1927
1928 u8 sta_info_tx_streams(struct sta_info *sta)
1929 {
1930 struct ieee80211_sta_ht_cap *ht_cap = &sta->sta.ht_cap;
1931 u8 rx_streams;
1932
1933 if (!sta->sta.ht_cap.ht_supported)
1934 return 1;
1935
1936 if (sta->sta.vht_cap.vht_supported) {
1937 int i;
1938 u16 tx_mcs_map =
1939 le16_to_cpu(sta->sta.vht_cap.vht_mcs.tx_mcs_map);
1940
1941 for (i = 7; i >= 0; i--)
1942 if ((tx_mcs_map & (0x3 << (i * 2))) !=
1943 IEEE80211_VHT_MCS_NOT_SUPPORTED)
1944 return i + 1;
1945 }
1946
1947 if (ht_cap->mcs.rx_mask[3])
1948 rx_streams = 4;
1949 else if (ht_cap->mcs.rx_mask[2])
1950 rx_streams = 3;
1951 else if (ht_cap->mcs.rx_mask[1])
1952 rx_streams = 2;
1953 else
1954 rx_streams = 1;
1955
1956 if (!(ht_cap->mcs.tx_params & IEEE80211_HT_MCS_TX_RX_DIFF))
1957 return rx_streams;
1958
1959 return ((ht_cap->mcs.tx_params & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
1960 >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1;
1961 }
1962
1963 static struct ieee80211_sta_rx_stats *
1964 sta_get_last_rx_stats(struct sta_info *sta)
1965 {
1966 struct ieee80211_sta_rx_stats *stats = &sta->rx_stats;
1967 struct ieee80211_local *local = sta->local;
1968 int cpu;
1969
1970 if (!ieee80211_hw_check(&local->hw, USES_RSS))
1971 return stats;
1972
1973 for_each_possible_cpu(cpu) {
1974 struct ieee80211_sta_rx_stats *cpustats;
1975
1976 cpustats = per_cpu_ptr(sta->pcpu_rx_stats, cpu);
1977
1978 if (time_after(cpustats->last_rx, stats->last_rx))
1979 stats = cpustats;
1980 }
1981
1982 return stats;
1983 }
1984
1985 static void sta_stats_decode_rate(struct ieee80211_local *local, u32 rate,
1986 struct rate_info *rinfo)
1987 {
1988 rinfo->bw = STA_STATS_GET(BW, rate);
1989
1990 switch (STA_STATS_GET(TYPE, rate)) {
1991 case STA_STATS_RATE_TYPE_VHT:
1992 rinfo->flags = RATE_INFO_FLAGS_VHT_MCS;
1993 rinfo->mcs = STA_STATS_GET(VHT_MCS, rate);
1994 rinfo->nss = STA_STATS_GET(VHT_NSS, rate);
1995 if (STA_STATS_GET(SGI, rate))
1996 rinfo->flags |= RATE_INFO_FLAGS_SHORT_GI;
1997 break;
1998 case STA_STATS_RATE_TYPE_HT:
1999 rinfo->flags = RATE_INFO_FLAGS_MCS;
2000 rinfo->mcs = STA_STATS_GET(HT_MCS, rate);
2001 if (STA_STATS_GET(SGI, rate))
2002 rinfo->flags |= RATE_INFO_FLAGS_SHORT_GI;
2003 break;
2004 case STA_STATS_RATE_TYPE_LEGACY: {
2005 struct ieee80211_supported_band *sband;
2006 u16 brate;
2007 unsigned int shift;
2008 int band = STA_STATS_GET(LEGACY_BAND, rate);
2009 int rate_idx = STA_STATS_GET(LEGACY_IDX, rate);
2010
2011 sband = local->hw.wiphy->bands[band];
2012 brate = sband->bitrates[rate_idx].bitrate;
2013 if (rinfo->bw == RATE_INFO_BW_5)
2014 shift = 2;
2015 else if (rinfo->bw == RATE_INFO_BW_10)
2016 shift = 1;
2017 else
2018 shift = 0;
2019 rinfo->legacy = DIV_ROUND_UP(brate, 1 << shift);
2020 break;
2021 }
2022 case STA_STATS_RATE_TYPE_HE:
2023 rinfo->flags = RATE_INFO_FLAGS_HE_MCS;
2024 rinfo->mcs = STA_STATS_GET(HE_MCS, rate);
2025 rinfo->nss = STA_STATS_GET(HE_NSS, rate);
2026 rinfo->he_gi = STA_STATS_GET(HE_GI, rate);
2027 rinfo->he_ru_alloc = STA_STATS_GET(HE_RU, rate);
2028 rinfo->he_dcm = STA_STATS_GET(HE_DCM, rate);
2029 break;
2030 }
2031 }
2032
2033 static int sta_set_rate_info_rx(struct sta_info *sta, struct rate_info *rinfo)
2034 {
2035 u16 rate = READ_ONCE(sta_get_last_rx_stats(sta)->last_rate);
2036
2037 if (rate == STA_STATS_RATE_INVALID)
2038 return -EINVAL;
2039
2040 sta_stats_decode_rate(sta->local, rate, rinfo);
2041 return 0;
2042 }
2043
2044 static void sta_set_tidstats(struct sta_info *sta,
2045 struct cfg80211_tid_stats *tidstats,
2046 int tid)
2047 {
2048 struct ieee80211_local *local = sta->local;
2049
2050 if (!(tidstats->filled & BIT(NL80211_TID_STATS_RX_MSDU))) {
2051 unsigned int start;
2052
2053 do {
2054 start = u64_stats_fetch_begin(&sta->rx_stats.syncp);
2055 tidstats->rx_msdu = sta->rx_stats.msdu[tid];
2056 } while (u64_stats_fetch_retry(&sta->rx_stats.syncp, start));
2057
2058 tidstats->filled |= BIT(NL80211_TID_STATS_RX_MSDU);
2059 }
2060
2061 if (!(tidstats->filled & BIT(NL80211_TID_STATS_TX_MSDU))) {
2062 tidstats->filled |= BIT(NL80211_TID_STATS_TX_MSDU);
2063 tidstats->tx_msdu = sta->tx_stats.msdu[tid];
2064 }
2065
2066 if (!(tidstats->filled & BIT(NL80211_TID_STATS_TX_MSDU_RETRIES)) &&
2067 ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
2068 tidstats->filled |= BIT(NL80211_TID_STATS_TX_MSDU_RETRIES);
2069 tidstats->tx_msdu_retries = sta->status_stats.msdu_retries[tid];
2070 }
2071
2072 if (!(tidstats->filled & BIT(NL80211_TID_STATS_TX_MSDU_FAILED)) &&
2073 ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
2074 tidstats->filled |= BIT(NL80211_TID_STATS_TX_MSDU_FAILED);
2075 tidstats->tx_msdu_failed = sta->status_stats.msdu_failed[tid];
2076 }
2077
2078 if (local->ops->wake_tx_queue && tid < IEEE80211_NUM_TIDS) {
2079 spin_lock_bh(&local->fq.lock);
2080 rcu_read_lock();
2081
2082 tidstats->filled |= BIT(NL80211_TID_STATS_TXQ_STATS);
2083 ieee80211_fill_txq_stats(&tidstats->txq_stats,
2084 to_txq_info(sta->sta.txq[tid]));
2085
2086 rcu_read_unlock();
2087 spin_unlock_bh(&local->fq.lock);
2088 }
2089 }
2090
2091 static inline u64 sta_get_stats_bytes(struct ieee80211_sta_rx_stats *rxstats)
2092 {
2093 unsigned int start;
2094 u64 value;
2095
2096 do {
2097 start = u64_stats_fetch_begin(&rxstats->syncp);
2098 value = rxstats->bytes;
2099 } while (u64_stats_fetch_retry(&rxstats->syncp, start));
2100
2101 return value;
2102 }
2103
2104 void sta_set_sinfo(struct sta_info *sta, struct station_info *sinfo,
2105 bool tidstats)
2106 {
2107 struct ieee80211_sub_if_data *sdata = sta->sdata;
2108 struct ieee80211_local *local = sdata->local;
2109 u32 thr = 0;
2110 int i, ac, cpu;
2111 struct ieee80211_sta_rx_stats *last_rxstats;
2112
2113 last_rxstats = sta_get_last_rx_stats(sta);
2114
2115 sinfo->generation = sdata->local->sta_generation;
2116
2117 /* do before driver, so beacon filtering drivers have a
2118 * chance to e.g. just add the number of filtered beacons
2119 * (or just modify the value entirely, of course)
2120 */
2121 if (sdata->vif.type == NL80211_IFTYPE_STATION)
2122 sinfo->rx_beacon = sdata->u.mgd.count_beacon_signal;
2123
2124 drv_sta_statistics(local, sdata, &sta->sta, sinfo);
2125
2126 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_INACTIVE_TIME) |
2127 BIT_ULL(NL80211_STA_INFO_STA_FLAGS) |
2128 BIT_ULL(NL80211_STA_INFO_BSS_PARAM) |
2129 BIT_ULL(NL80211_STA_INFO_CONNECTED_TIME) |
2130 BIT_ULL(NL80211_STA_INFO_RX_DROP_MISC);
2131
2132 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2133 sinfo->beacon_loss_count = sdata->u.mgd.beacon_loss_count;
2134 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_BEACON_LOSS);
2135 }
2136
2137 sinfo->connected_time = ktime_get_seconds() - sta->last_connected;
2138 sinfo->inactive_time =
2139 jiffies_to_msecs(jiffies - ieee80211_sta_last_active(sta));
2140
2141 if (!(sinfo->filled & (BIT_ULL(NL80211_STA_INFO_TX_BYTES64) |
2142 BIT_ULL(NL80211_STA_INFO_TX_BYTES)))) {
2143 sinfo->tx_bytes = 0;
2144 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
2145 sinfo->tx_bytes += sta->tx_stats.bytes[ac];
2146 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_TX_BYTES64);
2147 }
2148
2149 if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_TX_PACKETS))) {
2150 sinfo->tx_packets = 0;
2151 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
2152 sinfo->tx_packets += sta->tx_stats.packets[ac];
2153 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_TX_PACKETS);
2154 }
2155
2156 if (!(sinfo->filled & (BIT_ULL(NL80211_STA_INFO_RX_BYTES64) |
2157 BIT_ULL(NL80211_STA_INFO_RX_BYTES)))) {
2158 sinfo->rx_bytes += sta_get_stats_bytes(&sta->rx_stats);
2159
2160 if (sta->pcpu_rx_stats) {
2161 for_each_possible_cpu(cpu) {
2162 struct ieee80211_sta_rx_stats *cpurxs;
2163
2164 cpurxs = per_cpu_ptr(sta->pcpu_rx_stats, cpu);
2165 sinfo->rx_bytes += sta_get_stats_bytes(cpurxs);
2166 }
2167 }
2168
2169 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_RX_BYTES64);
2170 }
2171
2172 if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_RX_PACKETS))) {
2173 sinfo->rx_packets = sta->rx_stats.packets;
2174 if (sta->pcpu_rx_stats) {
2175 for_each_possible_cpu(cpu) {
2176 struct ieee80211_sta_rx_stats *cpurxs;
2177
2178 cpurxs = per_cpu_ptr(sta->pcpu_rx_stats, cpu);
2179 sinfo->rx_packets += cpurxs->packets;
2180 }
2181 }
2182 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_RX_PACKETS);
2183 }
2184
2185 if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_TX_RETRIES))) {
2186 sinfo->tx_retries = sta->status_stats.retry_count;
2187 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_TX_RETRIES);
2188 }
2189
2190 if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_TX_FAILED))) {
2191 sinfo->tx_failed = sta->status_stats.retry_failed;
2192 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_TX_FAILED);
2193 }
2194
2195 sinfo->rx_dropped_misc = sta->rx_stats.dropped;
2196 if (sta->pcpu_rx_stats) {
2197 for_each_possible_cpu(cpu) {
2198 struct ieee80211_sta_rx_stats *cpurxs;
2199
2200 cpurxs = per_cpu_ptr(sta->pcpu_rx_stats, cpu);
2201 sinfo->rx_dropped_misc += cpurxs->dropped;
2202 }
2203 }
2204
2205 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2206 !(sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)) {
2207 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_BEACON_RX) |
2208 BIT_ULL(NL80211_STA_INFO_BEACON_SIGNAL_AVG);
2209 sinfo->rx_beacon_signal_avg = ieee80211_ave_rssi(&sdata->vif);
2210 }
2211
2212 if (ieee80211_hw_check(&sta->local->hw, SIGNAL_DBM) ||
2213 ieee80211_hw_check(&sta->local->hw, SIGNAL_UNSPEC)) {
2214 if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_SIGNAL))) {
2215 sinfo->signal = (s8)last_rxstats->last_signal;
2216 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_SIGNAL);
2217 }
2218
2219 if (!sta->pcpu_rx_stats &&
2220 !(sinfo->filled & BIT_ULL(NL80211_STA_INFO_SIGNAL_AVG))) {
2221 sinfo->signal_avg =
2222 -ewma_signal_read(&sta->rx_stats_avg.signal);
2223 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_SIGNAL_AVG);
2224 }
2225 }
2226
2227 /* for the average - if pcpu_rx_stats isn't set - rxstats must point to
2228 * the sta->rx_stats struct, so the check here is fine with and without
2229 * pcpu statistics
2230 */
2231 if (last_rxstats->chains &&
2232 !(sinfo->filled & (BIT_ULL(NL80211_STA_INFO_CHAIN_SIGNAL) |
2233 BIT_ULL(NL80211_STA_INFO_CHAIN_SIGNAL_AVG)))) {
2234 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_CHAIN_SIGNAL);
2235 if (!sta->pcpu_rx_stats)
2236 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_CHAIN_SIGNAL_AVG);
2237
2238 sinfo->chains = last_rxstats->chains;
2239
2240 for (i = 0; i < ARRAY_SIZE(sinfo->chain_signal); i++) {
2241 sinfo->chain_signal[i] =
2242 last_rxstats->chain_signal_last[i];
2243 sinfo->chain_signal_avg[i] =
2244 -ewma_signal_read(&sta->rx_stats_avg.chain_signal[i]);
2245 }
2246 }
2247
2248 if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_TX_BITRATE))) {
2249 sta_set_rate_info_tx(sta, &sta->tx_stats.last_rate,
2250 &sinfo->txrate);
2251 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_TX_BITRATE);
2252 }
2253
2254 if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_RX_BITRATE))) {
2255 if (sta_set_rate_info_rx(sta, &sinfo->rxrate) == 0)
2256 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_RX_BITRATE);
2257 }
2258
2259 if (tidstats && !cfg80211_sinfo_alloc_tid_stats(sinfo, GFP_KERNEL)) {
2260 for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) {
2261 struct cfg80211_tid_stats *tidstats = &sinfo->pertid[i];
2262
2263 sta_set_tidstats(sta, tidstats, i);
2264 }
2265 }
2266
2267 if (ieee80211_vif_is_mesh(&sdata->vif)) {
2268 #ifdef CONFIG_MAC80211_MESH
2269 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_LLID) |
2270 BIT_ULL(NL80211_STA_INFO_PLID) |
2271 BIT_ULL(NL80211_STA_INFO_PLINK_STATE) |
2272 BIT_ULL(NL80211_STA_INFO_LOCAL_PM) |
2273 BIT_ULL(NL80211_STA_INFO_PEER_PM) |
2274 BIT_ULL(NL80211_STA_INFO_NONPEER_PM);
2275
2276 sinfo->llid = sta->mesh->llid;
2277 sinfo->plid = sta->mesh->plid;
2278 sinfo->plink_state = sta->mesh->plink_state;
2279 if (test_sta_flag(sta, WLAN_STA_TOFFSET_KNOWN)) {
2280 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_T_OFFSET);
2281 sinfo->t_offset = sta->mesh->t_offset;
2282 }
2283 sinfo->local_pm = sta->mesh->local_pm;
2284 sinfo->peer_pm = sta->mesh->peer_pm;
2285 sinfo->nonpeer_pm = sta->mesh->nonpeer_pm;
2286 #endif
2287 }
2288
2289 sinfo->bss_param.flags = 0;
2290 if (sdata->vif.bss_conf.use_cts_prot)
2291 sinfo->bss_param.flags |= BSS_PARAM_FLAGS_CTS_PROT;
2292 if (sdata->vif.bss_conf.use_short_preamble)
2293 sinfo->bss_param.flags |= BSS_PARAM_FLAGS_SHORT_PREAMBLE;
2294 if (sdata->vif.bss_conf.use_short_slot)
2295 sinfo->bss_param.flags |= BSS_PARAM_FLAGS_SHORT_SLOT_TIME;
2296 sinfo->bss_param.dtim_period = sdata->vif.bss_conf.dtim_period;
2297 sinfo->bss_param.beacon_interval = sdata->vif.bss_conf.beacon_int;
2298
2299 sinfo->sta_flags.set = 0;
2300 sinfo->sta_flags.mask = BIT(NL80211_STA_FLAG_AUTHORIZED) |
2301 BIT(NL80211_STA_FLAG_SHORT_PREAMBLE) |
2302 BIT(NL80211_STA_FLAG_WME) |
2303 BIT(NL80211_STA_FLAG_MFP) |
2304 BIT(NL80211_STA_FLAG_AUTHENTICATED) |
2305 BIT(NL80211_STA_FLAG_ASSOCIATED) |
2306 BIT(NL80211_STA_FLAG_TDLS_PEER);
2307 if (test_sta_flag(sta, WLAN_STA_AUTHORIZED))
2308 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_AUTHORIZED);
2309 if (test_sta_flag(sta, WLAN_STA_SHORT_PREAMBLE))
2310 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_SHORT_PREAMBLE);
2311 if (sta->sta.wme)
2312 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_WME);
2313 if (test_sta_flag(sta, WLAN_STA_MFP))
2314 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_MFP);
2315 if (test_sta_flag(sta, WLAN_STA_AUTH))
2316 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_AUTHENTICATED);
2317 if (test_sta_flag(sta, WLAN_STA_ASSOC))
2318 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_ASSOCIATED);
2319 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER))
2320 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_TDLS_PEER);
2321
2322 thr = sta_get_expected_throughput(sta);
2323
2324 if (thr != 0) {
2325 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_EXPECTED_THROUGHPUT);
2326 sinfo->expected_throughput = thr;
2327 }
2328
2329 if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_ACK_SIGNAL)) &&
2330 sta->status_stats.ack_signal_filled) {
2331 sinfo->ack_signal = sta->status_stats.last_ack_signal;
2332 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_ACK_SIGNAL);
2333 }
2334
2335 if (ieee80211_hw_check(&sta->local->hw, REPORTS_TX_ACK_STATUS) &&
2336 !(sinfo->filled & BIT_ULL(NL80211_STA_INFO_DATA_ACK_SIGNAL_AVG))) {
2337 sinfo->avg_ack_signal =
2338 -(s8)ewma_avg_signal_read(
2339 &sta->status_stats.avg_ack_signal);
2340 sinfo->filled |=
2341 BIT_ULL(NL80211_STA_INFO_DATA_ACK_SIGNAL_AVG);
2342 }
2343 }
2344
2345 u32 sta_get_expected_throughput(struct sta_info *sta)
2346 {
2347 struct ieee80211_sub_if_data *sdata = sta->sdata;
2348 struct ieee80211_local *local = sdata->local;
2349 struct rate_control_ref *ref = NULL;
2350 u32 thr = 0;
2351
2352 if (test_sta_flag(sta, WLAN_STA_RATE_CONTROL))
2353 ref = local->rate_ctrl;
2354
2355 /* check if the driver has a SW RC implementation */
2356 if (ref && ref->ops->get_expected_throughput)
2357 thr = ref->ops->get_expected_throughput(sta->rate_ctrl_priv);
2358 else
2359 thr = drv_get_expected_throughput(local, sta);
2360
2361 return thr;
2362 }
2363
2364 unsigned long ieee80211_sta_last_active(struct sta_info *sta)
2365 {
2366 struct ieee80211_sta_rx_stats *stats = sta_get_last_rx_stats(sta);
2367
2368 if (!sta->status_stats.last_ack ||
2369 time_after(stats->last_rx, sta->status_stats.last_ack))
2370 return stats->last_rx;
2371 return sta->status_stats.last_ack;
2372 }
2373
2374 static void sta_update_codel_params(struct sta_info *sta, u32 thr)
2375 {
2376 if (!sta->sdata->local->ops->wake_tx_queue)
2377 return;
2378
2379 if (thr && thr < STA_SLOW_THRESHOLD * sta->local->num_sta) {
2380 sta->cparams.target = MS2TIME(50);
2381 sta->cparams.interval = MS2TIME(300);
2382 sta->cparams.ecn = false;
2383 } else {
2384 sta->cparams.target = MS2TIME(20);
2385 sta->cparams.interval = MS2TIME(100);
2386 sta->cparams.ecn = true;
2387 }
2388 }
2389
2390 void ieee80211_sta_set_expected_throughput(struct ieee80211_sta *pubsta,
2391 u32 thr)
2392 {
2393 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
2394
2395 sta_update_codel_params(sta, thr);
2396 }
Linux with added FPC-III support