1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright 2002-2005, Instant802 Networks, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2013-2014 Intel Mobile Communications GmbH
6 * Copyright (C) 2015 - 2017 Intel Deutschland GmbH
7 * Copyright (C) 2018-2021 Intel Corporation
8 */
9
10 #include <linux/module.h>
11 #include <linux/init.h>
12 #include <linux/etherdevice.h>
13 #include <linux/netdevice.h>
14 #include <linux/types.h>
15 #include <linux/slab.h>
16 #include <linux/skbuff.h>
17 #include <linux/if_arp.h>
18 #include <linux/timer.h>
19 #include <linux/rtnetlink.h>
20
21 #include <net/codel.h>
22 #include <net/mac80211.h>
23 #include "ieee80211_i.h"
24 #include "driver-ops.h"
25 #include "rate.h"
26 #include "sta_info.h"
27 #include "debugfs_sta.h"
28 #include "mesh.h"
29 #include "wme.h"
30
31 /**
32 * DOC: STA information lifetime rules
33 *
34 * STA info structures (&struct sta_info) are managed in a hash table
35 * for faster lookup and a list for iteration. They are managed using
36 * RCU, i.e. access to the list and hash table is protected by RCU.
37 *
38 * Upon allocating a STA info structure with sta_info_alloc(), the caller
39 * owns that structure. It must then insert it into the hash table using
40 * either sta_info_insert() or sta_info_insert_rcu(); only in the latter
41 * case (which acquires an rcu read section but must not be called from
42 * within one) will the pointer still be valid after the call. Note that
43 * the caller may not do much with the STA info before inserting it, in
44 * particular, it may not start any mesh peer link management or add
45 * encryption keys.
46 *
47 * When the insertion fails (sta_info_insert()) returns non-zero), the
48 * structure will have been freed by sta_info_insert()!
49 *
50 * Station entries are added by mac80211 when you establish a link with a
51 * peer. This means different things for the different type of interfaces
52 * we support. For a regular station this mean we add the AP sta when we
53 * receive an association response from the AP. For IBSS this occurs when
54 * get to know about a peer on the same IBSS. For WDS we add the sta for
55 * the peer immediately upon device open. When using AP mode we add stations
56 * for each respective station upon request from userspace through nl80211.
57 *
58 * In order to remove a STA info structure, various sta_info_destroy_*()
59 * calls are available.
60 *
61 * There is no concept of ownership on a STA entry, each structure is
62 * owned by the global hash table/list until it is removed. All users of
63 * the structure need to be RCU protected so that the structure won't be
64 * freed before they are done using it.
65 */
66
67 static const struct rhashtable_params sta_rht_params = {
68 .nelem_hint = 3, /* start small */
69 .automatic_shrinking = true,
70 .head_offset = offsetof(struct sta_info, hash_node),
71 .key_offset = offsetof(struct sta_info, addr),
72 .key_len = ETH_ALEN,
73 .max_size = CONFIG_MAC80211_STA_HASH_MAX_SIZE,
74 };
75
76 /* Caller must hold local->sta_mtx */
sta_info_hash_del(struct ieee80211_local * local,struct sta_info * sta)77 static int sta_info_hash_del(struct ieee80211_local *local,
78 struct sta_info *sta)
79 {
80 return rhltable_remove(&local->sta_hash, &sta->hash_node,
81 sta_rht_params);
82 }
83
__cleanup_single_sta(struct sta_info * sta)84 static void __cleanup_single_sta(struct sta_info *sta)
85 {
86 int ac, i;
87 struct tid_ampdu_tx *tid_tx;
88 struct ieee80211_sub_if_data *sdata = sta->sdata;
89 struct ieee80211_local *local = sdata->local;
90 struct ps_data *ps;
91
92 if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
93 test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
94 test_sta_flag(sta, WLAN_STA_PS_DELIVER)) {
95 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
96 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
97 ps = &sdata->bss->ps;
98 else if (ieee80211_vif_is_mesh(&sdata->vif))
99 ps = &sdata->u.mesh.ps;
100 else
101 return;
102
103 clear_sta_flag(sta, WLAN_STA_PS_STA);
104 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
105 clear_sta_flag(sta, WLAN_STA_PS_DELIVER);
106
107 atomic_dec(&ps->num_sta_ps);
108 }
109
110 if (sta->sta.txq[0]) {
111 for (i = 0; i < ARRAY_SIZE(sta->sta.txq); i++) {
112 struct txq_info *txqi;
113
114 if (!sta->sta.txq[i])
115 continue;
116
117 txqi = to_txq_info(sta->sta.txq[i]);
118
119 ieee80211_txq_purge(local, txqi);
120 }
121 }
122
123 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
124 local->total_ps_buffered -= skb_queue_len(&sta->ps_tx_buf[ac]);
125 ieee80211_purge_tx_queue(&local->hw, &sta->ps_tx_buf[ac]);
126 ieee80211_purge_tx_queue(&local->hw, &sta->tx_filtered[ac]);
127 }
128
129 if (ieee80211_vif_is_mesh(&sdata->vif))
130 mesh_sta_cleanup(sta);
131
132 cancel_work_sync(&sta->drv_deliver_wk);
133
134 /*
135 * Destroy aggregation state here. It would be nice to wait for the
136 * driver to finish aggregation stop and then clean up, but for now
137 * drivers have to handle aggregation stop being requested, followed
138 * directly by station destruction.
139 */
140 for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
141 kfree(sta->ampdu_mlme.tid_start_tx[i]);
142 tid_tx = rcu_dereference_raw(sta->ampdu_mlme.tid_tx[i]);
143 if (!tid_tx)
144 continue;
145 ieee80211_purge_tx_queue(&local->hw, &tid_tx->pending);
146 kfree(tid_tx);
147 }
148 }
149
cleanup_single_sta(struct sta_info * sta)150 static void cleanup_single_sta(struct sta_info *sta)
151 {
152 struct ieee80211_sub_if_data *sdata = sta->sdata;
153 struct ieee80211_local *local = sdata->local;
154
155 __cleanup_single_sta(sta);
156 sta_info_free(local, sta);
157 }
158
sta_info_hash_lookup(struct ieee80211_local * local,const u8 * addr)159 struct rhlist_head *sta_info_hash_lookup(struct ieee80211_local *local,
160 const u8 *addr)
161 {
162 return rhltable_lookup(&local->sta_hash, addr, sta_rht_params);
163 }
164
165 /* protected by RCU */
sta_info_get(struct ieee80211_sub_if_data * sdata,const u8 * addr)166 struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata,
167 const u8 *addr)
168 {
169 struct ieee80211_local *local = sdata->local;
170 struct rhlist_head *tmp;
171 struct sta_info *sta;
172
173 rcu_read_lock();
174 for_each_sta_info(local, addr, sta, tmp) {
175 if (sta->sdata == sdata) {
176 rcu_read_unlock();
177 /* this is safe as the caller must already hold
178 * another rcu read section or the mutex
179 */
180 return sta;
181 }
182 }
183 rcu_read_unlock();
184 return NULL;
185 }
186
187 /*
188 * Get sta info either from the specified interface
189 * or from one of its vlans
190 */
sta_info_get_bss(struct ieee80211_sub_if_data * sdata,const u8 * addr)191 struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata,
192 const u8 *addr)
193 {
194 struct ieee80211_local *local = sdata->local;
195 struct rhlist_head *tmp;
196 struct sta_info *sta;
197
198 rcu_read_lock();
199 for_each_sta_info(local, addr, sta, tmp) {
200 if (sta->sdata == sdata ||
201 (sta->sdata->bss && sta->sdata->bss == sdata->bss)) {
202 rcu_read_unlock();
203 /* this is safe as the caller must already hold
204 * another rcu read section or the mutex
205 */
206 return sta;
207 }
208 }
209 rcu_read_unlock();
210 return NULL;
211 }
212
sta_info_get_by_addrs(struct ieee80211_local * local,const u8 * sta_addr,const u8 * vif_addr)213 struct sta_info *sta_info_get_by_addrs(struct ieee80211_local *local,
214 const u8 *sta_addr, const u8 *vif_addr)
215 {
216 struct rhlist_head *tmp;
217 struct sta_info *sta;
218
219 for_each_sta_info(local, sta_addr, sta, tmp) {
220 if (ether_addr_equal(vif_addr, sta->sdata->vif.addr))
221 return sta;
222 }
223
224 return NULL;
225 }
226
sta_info_get_by_idx(struct ieee80211_sub_if_data * sdata,int idx)227 struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
228 int idx)
229 {
230 struct ieee80211_local *local = sdata->local;
231 struct sta_info *sta;
232 int i = 0;
233
234 list_for_each_entry_rcu(sta, &local->sta_list, list,
235 lockdep_is_held(&local->sta_mtx)) {
236 if (sdata != sta->sdata)
237 continue;
238 if (i < idx) {
239 ++i;
240 continue;
241 }
242 return sta;
243 }
244
245 return NULL;
246 }
247
248 /**
249 * sta_info_free - free STA
250 *
251 * @local: pointer to the global information
252 * @sta: STA info to free
253 *
254 * This function must undo everything done by sta_info_alloc()
255 * that may happen before sta_info_insert(). It may only be
256 * called when sta_info_insert() has not been attempted (and
257 * if that fails, the station is freed anyway.)
258 */
sta_info_free(struct ieee80211_local * local,struct sta_info * sta)259 void sta_info_free(struct ieee80211_local *local, struct sta_info *sta)
260 {
261 /*
262 * If we had used sta_info_pre_move_state() then we might not
263 * have gone through the state transitions down again, so do
264 * it here now (and warn if it's inserted).
265 *
266 * This will clear state such as fast TX/RX that may have been
267 * allocated during state transitions.
268 */
269 while (sta->sta_state > IEEE80211_STA_NONE) {
270 int ret;
271
272 WARN_ON_ONCE(test_sta_flag(sta, WLAN_STA_INSERTED));
273
274 ret = sta_info_move_state(sta, sta->sta_state - 1);
275 if (WARN_ONCE(ret, "sta_info_move_state() returned %d\n", ret))
276 break;
277 }
278
279 if (sta->rate_ctrl)
280 rate_control_free_sta(sta);
281
282 sta_dbg(sta->sdata, "Destroyed STA %pM\n", sta->sta.addr);
283
284 if (sta->sta.txq[0])
285 kfree(to_txq_info(sta->sta.txq[0]));
286 kfree(rcu_dereference_raw(sta->sta.rates));
287 #ifdef CONFIG_MAC80211_MESH
288 kfree(sta->mesh);
289 #endif
290 free_percpu(sta->pcpu_rx_stats);
291 kfree(sta);
292 }
293
294 /* Caller must hold local->sta_mtx */
sta_info_hash_add(struct ieee80211_local * local,struct sta_info * sta)295 static int sta_info_hash_add(struct ieee80211_local *local,
296 struct sta_info *sta)
297 {
298 return rhltable_insert(&local->sta_hash, &sta->hash_node,
299 sta_rht_params);
300 }
301
sta_deliver_ps_frames(struct work_struct * wk)302 static void sta_deliver_ps_frames(struct work_struct *wk)
303 {
304 struct sta_info *sta;
305
306 sta = container_of(wk, struct sta_info, drv_deliver_wk);
307
308 if (sta->dead)
309 return;
310
311 local_bh_disable();
312 if (!test_sta_flag(sta, WLAN_STA_PS_STA))
313 ieee80211_sta_ps_deliver_wakeup(sta);
314 else if (test_and_clear_sta_flag(sta, WLAN_STA_PSPOLL))
315 ieee80211_sta_ps_deliver_poll_response(sta);
316 else if (test_and_clear_sta_flag(sta, WLAN_STA_UAPSD))
317 ieee80211_sta_ps_deliver_uapsd(sta);
318 local_bh_enable();
319 }
320
sta_prepare_rate_control(struct ieee80211_local * local,struct sta_info * sta,gfp_t gfp)321 static int sta_prepare_rate_control(struct ieee80211_local *local,
322 struct sta_info *sta, gfp_t gfp)
323 {
324 if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL))
325 return 0;
326
327 sta->rate_ctrl = local->rate_ctrl;
328 sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl,
329 sta, gfp);
330 if (!sta->rate_ctrl_priv)
331 return -ENOMEM;
332
333 return 0;
334 }
335
sta_info_alloc(struct ieee80211_sub_if_data * sdata,const u8 * addr,gfp_t gfp)336 struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
337 const u8 *addr, gfp_t gfp)
338 {
339 struct ieee80211_local *local = sdata->local;
340 struct ieee80211_hw *hw = &local->hw;
341 struct sta_info *sta;
342 int i;
343
344 sta = kzalloc(sizeof(*sta) + hw->sta_data_size, gfp);
345 if (!sta)
346 return NULL;
347
348 if (ieee80211_hw_check(hw, USES_RSS)) {
349 sta->pcpu_rx_stats =
350 alloc_percpu_gfp(struct ieee80211_sta_rx_stats, gfp);
351 if (!sta->pcpu_rx_stats)
352 goto free;
353 }
354
355 spin_lock_init(&sta->lock);
356 spin_lock_init(&sta->ps_lock);
357 INIT_WORK(&sta->drv_deliver_wk, sta_deliver_ps_frames);
358 INIT_WORK(&sta->ampdu_mlme.work, ieee80211_ba_session_work);
359 mutex_init(&sta->ampdu_mlme.mtx);
360 #ifdef CONFIG_MAC80211_MESH
361 if (ieee80211_vif_is_mesh(&sdata->vif)) {
362 sta->mesh = kzalloc(sizeof(*sta->mesh), gfp);
363 if (!sta->mesh)
364 goto free;
365 sta->mesh->plink_sta = sta;
366 spin_lock_init(&sta->mesh->plink_lock);
367 if (ieee80211_vif_is_mesh(&sdata->vif) &&
368 !sdata->u.mesh.user_mpm)
369 timer_setup(&sta->mesh->plink_timer, mesh_plink_timer,
370 0);
371 sta->mesh->nonpeer_pm = NL80211_MESH_POWER_ACTIVE;
372 }
373 #endif
374
375 memcpy(sta->addr, addr, ETH_ALEN);
376 memcpy(sta->sta.addr, addr, ETH_ALEN);
377 sta->sta.max_rx_aggregation_subframes =
378 local->hw.max_rx_aggregation_subframes;
379
380 /* Extended Key ID needs to install keys for keyid 0 and 1 Rx-only.
381 * The Tx path starts to use a key as soon as the key slot ptk_idx
382 * references to is not NULL. To not use the initial Rx-only key
383 * prematurely for Tx initialize ptk_idx to an impossible PTK keyid
384 * which always will refer to a NULL key.
385 */
386 BUILD_BUG_ON(ARRAY_SIZE(sta->ptk) <= INVALID_PTK_KEYIDX);
387 sta->ptk_idx = INVALID_PTK_KEYIDX;
388
389 sta->local = local;
390 sta->sdata = sdata;
391 sta->rx_stats.last_rx = jiffies;
392
393 u64_stats_init(&sta->rx_stats.syncp);
394
395 ieee80211_init_frag_cache(&sta->frags);
396
397 sta->sta_state = IEEE80211_STA_NONE;
398
399 /* Mark TID as unreserved */
400 sta->reserved_tid = IEEE80211_TID_UNRESERVED;
401
402 sta->last_connected = ktime_get_seconds();
403 ewma_signal_init(&sta->rx_stats_avg.signal);
404 ewma_avg_signal_init(&sta->status_stats.avg_ack_signal);
405 for (i = 0; i < ARRAY_SIZE(sta->rx_stats_avg.chain_signal); i++)
406 ewma_signal_init(&sta->rx_stats_avg.chain_signal[i]);
407
408 if (local->ops->wake_tx_queue) {
409 void *txq_data;
410 int size = sizeof(struct txq_info) +
411 ALIGN(hw->txq_data_size, sizeof(void *));
412
413 txq_data = kcalloc(ARRAY_SIZE(sta->sta.txq), size, gfp);
414 if (!txq_data)
415 goto free;
416
417 for (i = 0; i < ARRAY_SIZE(sta->sta.txq); i++) {
418 struct txq_info *txq = txq_data + i * size;
419
420 /* might not do anything for the bufferable MMPDU TXQ */
421 ieee80211_txq_init(sdata, sta, txq, i);
422 }
423 }
424
425 if (sta_prepare_rate_control(local, sta, gfp))
426 goto free_txq;
427
428 sta->airtime_weight = IEEE80211_DEFAULT_AIRTIME_WEIGHT;
429
430 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
431 skb_queue_head_init(&sta->ps_tx_buf[i]);
432 skb_queue_head_init(&sta->tx_filtered[i]);
433 sta->airtime[i].deficit = sta->airtime_weight;
434 atomic_set(&sta->airtime[i].aql_tx_pending, 0);
435 sta->airtime[i].aql_limit_low = local->aql_txq_limit_low[i];
436 sta->airtime[i].aql_limit_high = local->aql_txq_limit_high[i];
437 }
438
439 for (i = 0; i < IEEE80211_NUM_TIDS; i++)
440 sta->last_seq_ctrl[i] = cpu_to_le16(USHRT_MAX);
441
442 for (i = 0; i < NUM_NL80211_BANDS; i++) {
443 u32 mandatory = 0;
444 int r;
445
446 if (!hw->wiphy->bands[i])
447 continue;
448
449 switch (i) {
450 case NL80211_BAND_2GHZ:
451 /*
452 * We use both here, even if we cannot really know for
453 * sure the station will support both, but the only use
454 * for this is when we don't know anything yet and send
455 * management frames, and then we'll pick the lowest
456 * possible rate anyway.
457 * If we don't include _G here, we cannot find a rate
458 * in P2P, and thus trigger the WARN_ONCE() in rate.c
459 */
460 mandatory = IEEE80211_RATE_MANDATORY_B |
461 IEEE80211_RATE_MANDATORY_G;
462 break;
463 case NL80211_BAND_5GHZ:
464 mandatory = IEEE80211_RATE_MANDATORY_A;
465 break;
466 case NL80211_BAND_60GHZ:
467 WARN_ON(1);
468 mandatory = 0;
469 break;
470 }
471
472 for (r = 0; r < hw->wiphy->bands[i]->n_bitrates; r++) {
473 struct ieee80211_rate *rate;
474
475 rate = &hw->wiphy->bands[i]->bitrates[r];
476
477 if (!(rate->flags & mandatory))
478 continue;
479 sta->sta.supp_rates[i] |= BIT(r);
480 }
481 }
482
483 sta->sta.smps_mode = IEEE80211_SMPS_OFF;
484 if (sdata->vif.type == NL80211_IFTYPE_AP ||
485 sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
486 struct ieee80211_supported_band *sband;
487 u8 smps;
488
489 sband = ieee80211_get_sband(sdata);
490 if (!sband)
491 goto free_txq;
492
493 smps = (sband->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >>
494 IEEE80211_HT_CAP_SM_PS_SHIFT;
495 /*
496 * Assume that hostapd advertises our caps in the beacon and
497 * this is the known_smps_mode for a station that just assciated
498 */
499 switch (smps) {
500 case WLAN_HT_SMPS_CONTROL_DISABLED:
501 sta->known_smps_mode = IEEE80211_SMPS_OFF;
502 break;
503 case WLAN_HT_SMPS_CONTROL_STATIC:
504 sta->known_smps_mode = IEEE80211_SMPS_STATIC;
505 break;
506 case WLAN_HT_SMPS_CONTROL_DYNAMIC:
507 sta->known_smps_mode = IEEE80211_SMPS_DYNAMIC;
508 break;
509 default:
510 WARN_ON(1);
511 }
512 }
513
514 sta->sta.max_rc_amsdu_len = IEEE80211_MAX_MPDU_LEN_HT_BA;
515
516 sta->cparams.ce_threshold = CODEL_DISABLED_THRESHOLD;
517 sta->cparams.target = MS2TIME(20);
518 sta->cparams.interval = MS2TIME(100);
519 sta->cparams.ecn = true;
520
521 sta_dbg(sdata, "Allocated STA %pM\n", sta->sta.addr);
522
523 return sta;
524
525 free_txq:
526 if (sta->sta.txq[0])
527 kfree(to_txq_info(sta->sta.txq[0]));
528 free:
529 free_percpu(sta->pcpu_rx_stats);
530 #ifdef CONFIG_MAC80211_MESH
531 kfree(sta->mesh);
532 #endif
533 kfree(sta);
534 return NULL;
535 }
536
sta_info_insert_check(struct sta_info * sta)537 static int sta_info_insert_check(struct sta_info *sta)
538 {
539 struct ieee80211_sub_if_data *sdata = sta->sdata;
540
541 /*
542 * Can't be a WARN_ON because it can be triggered through a race:
543 * something inserts a STA (on one CPU) without holding the RTNL
544 * and another CPU turns off the net device.
545 */
546 if (unlikely(!ieee80211_sdata_running(sdata)))
547 return -ENETDOWN;
548
549 if (WARN_ON(ether_addr_equal(sta->sta.addr, sdata->vif.addr) ||
550 is_multicast_ether_addr(sta->sta.addr)))
551 return -EINVAL;
552
553 /* The RCU read lock is required by rhashtable due to
554 * asynchronous resize/rehash. We also require the mutex
555 * for correctness.
556 */
557 rcu_read_lock();
558 lockdep_assert_held(&sdata->local->sta_mtx);
559 if (ieee80211_hw_check(&sdata->local->hw, NEEDS_UNIQUE_STA_ADDR) &&
560 ieee80211_find_sta_by_ifaddr(&sdata->local->hw, sta->addr, NULL)) {
561 rcu_read_unlock();
562 return -ENOTUNIQ;
563 }
564 rcu_read_unlock();
565
566 return 0;
567 }
568
sta_info_insert_drv_state(struct ieee80211_local * local,struct ieee80211_sub_if_data * sdata,struct sta_info * sta)569 static int sta_info_insert_drv_state(struct ieee80211_local *local,
570 struct ieee80211_sub_if_data *sdata,
571 struct sta_info *sta)
572 {
573 enum ieee80211_sta_state state;
574 int err = 0;
575
576 for (state = IEEE80211_STA_NOTEXIST; state < sta->sta_state; state++) {
577 err = drv_sta_state(local, sdata, sta, state, state + 1);
578 if (err)
579 break;
580 }
581
582 if (!err) {
583 /*
584 * Drivers using legacy sta_add/sta_remove callbacks only
585 * get uploaded set to true after sta_add is called.
586 */
587 if (!local->ops->sta_add)
588 sta->uploaded = true;
589 return 0;
590 }
591
592 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
593 sdata_info(sdata,
594 "failed to move IBSS STA %pM to state %d (%d) - keeping it anyway\n",
595 sta->sta.addr, state + 1, err);
596 err = 0;
597 }
598
599 /* unwind on error */
600 for (; state > IEEE80211_STA_NOTEXIST; state--)
601 WARN_ON(drv_sta_state(local, sdata, sta, state, state - 1));
602
603 return err;
604 }
605
606 static void
ieee80211_recalc_p2p_go_ps_allowed(struct ieee80211_sub_if_data * sdata)607 ieee80211_recalc_p2p_go_ps_allowed(struct ieee80211_sub_if_data *sdata)
608 {
609 struct ieee80211_local *local = sdata->local;
610 bool allow_p2p_go_ps = sdata->vif.p2p;
611 struct sta_info *sta;
612
613 rcu_read_lock();
614 list_for_each_entry_rcu(sta, &local->sta_list, list) {
615 if (sdata != sta->sdata ||
616 !test_sta_flag(sta, WLAN_STA_ASSOC))
617 continue;
618 if (!sta->sta.support_p2p_ps) {
619 allow_p2p_go_ps = false;
620 break;
621 }
622 }
623 rcu_read_unlock();
624
625 if (allow_p2p_go_ps != sdata->vif.bss_conf.allow_p2p_go_ps) {
626 sdata->vif.bss_conf.allow_p2p_go_ps = allow_p2p_go_ps;
627 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_P2P_PS);
628 }
629 }
630
631 /*
632 * should be called with sta_mtx locked
633 * this function replaces the mutex lock
634 * with a RCU lock
635 */
sta_info_insert_finish(struct sta_info * sta)636 static int sta_info_insert_finish(struct sta_info *sta) __acquires(RCU)
637 {
638 struct ieee80211_local *local = sta->local;
639 struct ieee80211_sub_if_data *sdata = sta->sdata;
640 struct station_info *sinfo = NULL;
641 int err = 0;
642
643 lockdep_assert_held(&local->sta_mtx);
644
645 /* check if STA exists already */
646 if (sta_info_get_bss(sdata, sta->sta.addr)) {
647 err = -EEXIST;
648 goto out_cleanup;
649 }
650
651 sinfo = kzalloc(sizeof(struct station_info), GFP_KERNEL);
652 if (!sinfo) {
653 err = -ENOMEM;
654 goto out_cleanup;
655 }
656
657 local->num_sta++;
658 local->sta_generation++;
659 smp_mb();
660
661 /* simplify things and don't accept BA sessions yet */
662 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
663
664 /* make the station visible */
665 err = sta_info_hash_add(local, sta);
666 if (err)
667 goto out_drop_sta;
668
669 list_add_tail_rcu(&sta->list, &local->sta_list);
670
671 /* notify driver */
672 err = sta_info_insert_drv_state(local, sdata, sta);
673 if (err)
674 goto out_remove;
675
676 set_sta_flag(sta, WLAN_STA_INSERTED);
677
678 if (sta->sta_state >= IEEE80211_STA_ASSOC) {
679 ieee80211_recalc_min_chandef(sta->sdata);
680 if (!sta->sta.support_p2p_ps)
681 ieee80211_recalc_p2p_go_ps_allowed(sta->sdata);
682 }
683
684 /* accept BA sessions now */
685 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
686
687 ieee80211_sta_debugfs_add(sta);
688 rate_control_add_sta_debugfs(sta);
689
690 sinfo->generation = local->sta_generation;
691 cfg80211_new_sta(sdata->dev, sta->sta.addr, sinfo, GFP_KERNEL);
692 kfree(sinfo);
693
694 sta_dbg(sdata, "Inserted STA %pM\n", sta->sta.addr);
695
696 /* move reference to rcu-protected */
697 rcu_read_lock();
698 mutex_unlock(&local->sta_mtx);
699
700 if (ieee80211_vif_is_mesh(&sdata->vif))
701 mesh_accept_plinks_update(sdata);
702
703 return 0;
704 out_remove:
705 sta_info_hash_del(local, sta);
706 list_del_rcu(&sta->list);
707 out_drop_sta:
708 local->num_sta--;
709 synchronize_net();
710 out_cleanup:
711 cleanup_single_sta(sta);
712 mutex_unlock(&local->sta_mtx);
713 kfree(sinfo);
714 rcu_read_lock();
715 return err;
716 }
717
sta_info_insert_rcu(struct sta_info * sta)718 int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU)
719 {
720 struct ieee80211_local *local = sta->local;
721 int err;
722
723 might_sleep();
724
725 mutex_lock(&local->sta_mtx);
726
727 err = sta_info_insert_check(sta);
728 if (err) {
729 sta_info_free(local, sta);
730 mutex_unlock(&local->sta_mtx);
731 rcu_read_lock();
732 return err;
733 }
734
735 return sta_info_insert_finish(sta);
736 }
737
sta_info_insert(struct sta_info * sta)738 int sta_info_insert(struct sta_info *sta)
739 {
740 int err = sta_info_insert_rcu(sta);
741
742 rcu_read_unlock();
743
744 return err;
745 }
746
__bss_tim_set(u8 * tim,u16 id)747 static inline void __bss_tim_set(u8 *tim, u16 id)
748 {
749 /*
750 * This format has been mandated by the IEEE specifications,
751 * so this line may not be changed to use the __set_bit() format.
752 */
753 tim[id / 8] |= (1 << (id % 8));
754 }
755
__bss_tim_clear(u8 * tim,u16 id)756 static inline void __bss_tim_clear(u8 *tim, u16 id)
757 {
758 /*
759 * This format has been mandated by the IEEE specifications,
760 * so this line may not be changed to use the __clear_bit() format.
761 */
762 tim[id / 8] &= ~(1 << (id % 8));
763 }
764
__bss_tim_get(u8 * tim,u16 id)765 static inline bool __bss_tim_get(u8 *tim, u16 id)
766 {
767 /*
768 * This format has been mandated by the IEEE specifications,
769 * so this line may not be changed to use the test_bit() format.
770 */
771 return tim[id / 8] & (1 << (id % 8));
772 }
773
ieee80211_tids_for_ac(int ac)774 static unsigned long ieee80211_tids_for_ac(int ac)
775 {
776 /* If we ever support TIDs > 7, this obviously needs to be adjusted */
777 switch (ac) {
778 case IEEE80211_AC_VO:
779 return BIT(6) | BIT(7);
780 case IEEE80211_AC_VI:
781 return BIT(4) | BIT(5);
782 case IEEE80211_AC_BE:
783 return BIT(0) | BIT(3);
784 case IEEE80211_AC_BK:
785 return BIT(1) | BIT(2);
786 default:
787 WARN_ON(1);
788 return 0;
789 }
790 }
791
__sta_info_recalc_tim(struct sta_info * sta,bool ignore_pending)792 static void __sta_info_recalc_tim(struct sta_info *sta, bool ignore_pending)
793 {
794 struct ieee80211_local *local = sta->local;
795 struct ps_data *ps;
796 bool indicate_tim = false;
797 u8 ignore_for_tim = sta->sta.uapsd_queues;
798 int ac;
799 u16 id = sta->sta.aid;
800
801 if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
802 sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
803 if (WARN_ON_ONCE(!sta->sdata->bss))
804 return;
805
806 ps = &sta->sdata->bss->ps;
807 #ifdef CONFIG_MAC80211_MESH
808 } else if (ieee80211_vif_is_mesh(&sta->sdata->vif)) {
809 ps = &sta->sdata->u.mesh.ps;
810 #endif
811 } else {
812 return;
813 }
814
815 /* No need to do anything if the driver does all */
816 if (ieee80211_hw_check(&local->hw, AP_LINK_PS) && !local->ops->set_tim)
817 return;
818
819 if (sta->dead)
820 goto done;
821
822 /*
823 * If all ACs are delivery-enabled then we should build
824 * the TIM bit for all ACs anyway; if only some are then
825 * we ignore those and build the TIM bit using only the
826 * non-enabled ones.
827 */
828 if (ignore_for_tim == BIT(IEEE80211_NUM_ACS) - 1)
829 ignore_for_tim = 0;
830
831 if (ignore_pending)
832 ignore_for_tim = BIT(IEEE80211_NUM_ACS) - 1;
833
834 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
835 unsigned long tids;
836
837 if (ignore_for_tim & ieee80211_ac_to_qos_mask[ac])
838 continue;
839
840 indicate_tim |= !skb_queue_empty(&sta->tx_filtered[ac]) ||
841 !skb_queue_empty(&sta->ps_tx_buf[ac]);
842 if (indicate_tim)
843 break;
844
845 tids = ieee80211_tids_for_ac(ac);
846
847 indicate_tim |=
848 sta->driver_buffered_tids & tids;
849 indicate_tim |=
850 sta->txq_buffered_tids & tids;
851 }
852
853 done:
854 spin_lock_bh(&local->tim_lock);
855
856 if (indicate_tim == __bss_tim_get(ps->tim, id))
857 goto out_unlock;
858
859 if (indicate_tim)
860 __bss_tim_set(ps->tim, id);
861 else
862 __bss_tim_clear(ps->tim, id);
863
864 if (local->ops->set_tim && !WARN_ON(sta->dead)) {
865 local->tim_in_locked_section = true;
866 drv_set_tim(local, &sta->sta, indicate_tim);
867 local->tim_in_locked_section = false;
868 }
869
870 out_unlock:
871 spin_unlock_bh(&local->tim_lock);
872 }
873
sta_info_recalc_tim(struct sta_info * sta)874 void sta_info_recalc_tim(struct sta_info *sta)
875 {
876 __sta_info_recalc_tim(sta, false);
877 }
878
sta_info_buffer_expired(struct sta_info * sta,struct sk_buff * skb)879 static bool sta_info_buffer_expired(struct sta_info *sta, struct sk_buff *skb)
880 {
881 struct ieee80211_tx_info *info;
882 int timeout;
883
884 if (!skb)
885 return false;
886
887 info = IEEE80211_SKB_CB(skb);
888
889 /* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
890 timeout = (sta->listen_interval *
891 sta->sdata->vif.bss_conf.beacon_int *
892 32 / 15625) * HZ;
893 if (timeout < STA_TX_BUFFER_EXPIRE)
894 timeout = STA_TX_BUFFER_EXPIRE;
895 return time_after(jiffies, info->control.jiffies + timeout);
896 }
897
898
sta_info_cleanup_expire_buffered_ac(struct ieee80211_local * local,struct sta_info * sta,int ac)899 static bool sta_info_cleanup_expire_buffered_ac(struct ieee80211_local *local,
900 struct sta_info *sta, int ac)
901 {
902 unsigned long flags;
903 struct sk_buff *skb;
904
905 /*
906 * First check for frames that should expire on the filtered
907 * queue. Frames here were rejected by the driver and are on
908 * a separate queue to avoid reordering with normal PS-buffered
909 * frames. They also aren't accounted for right now in the
910 * total_ps_buffered counter.
911 */
912 for (;;) {
913 spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
914 skb = skb_peek(&sta->tx_filtered[ac]);
915 if (sta_info_buffer_expired(sta, skb))
916 skb = __skb_dequeue(&sta->tx_filtered[ac]);
917 else
918 skb = NULL;
919 spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
920
921 /*
922 * Frames are queued in order, so if this one
923 * hasn't expired yet we can stop testing. If
924 * we actually reached the end of the queue we
925 * also need to stop, of course.
926 */
927 if (!skb)
928 break;
929 ieee80211_free_txskb(&local->hw, skb);
930 }
931
932 /*
933 * Now also check the normal PS-buffered queue, this will
934 * only find something if the filtered queue was emptied
935 * since the filtered frames are all before the normal PS
936 * buffered frames.
937 */
938 for (;;) {
939 spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
940 skb = skb_peek(&sta->ps_tx_buf[ac]);
941 if (sta_info_buffer_expired(sta, skb))
942 skb = __skb_dequeue(&sta->ps_tx_buf[ac]);
943 else
944 skb = NULL;
945 spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
946
947 /*
948 * frames are queued in order, so if this one
949 * hasn't expired yet (or we reached the end of
950 * the queue) we can stop testing
951 */
952 if (!skb)
953 break;
954
955 local->total_ps_buffered--;
956 ps_dbg(sta->sdata, "Buffered frame expired (STA %pM)\n",
957 sta->sta.addr);
958 ieee80211_free_txskb(&local->hw, skb);
959 }
960
961 /*
962 * Finally, recalculate the TIM bit for this station -- it might
963 * now be clear because the station was too slow to retrieve its
964 * frames.
965 */
966 sta_info_recalc_tim(sta);
967
968 /*
969 * Return whether there are any frames still buffered, this is
970 * used to check whether the cleanup timer still needs to run,
971 * if there are no frames we don't need to rearm the timer.
972 */
973 return !(skb_queue_empty(&sta->ps_tx_buf[ac]) &&
974 skb_queue_empty(&sta->tx_filtered[ac]));
975 }
976
sta_info_cleanup_expire_buffered(struct ieee80211_local * local,struct sta_info * sta)977 static bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
978 struct sta_info *sta)
979 {
980 bool have_buffered = false;
981 int ac;
982
983 /* This is only necessary for stations on BSS/MBSS interfaces */
984 if (!sta->sdata->bss &&
985 !ieee80211_vif_is_mesh(&sta->sdata->vif))
986 return false;
987
988 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
989 have_buffered |=
990 sta_info_cleanup_expire_buffered_ac(local, sta, ac);
991
992 return have_buffered;
993 }
994
__sta_info_destroy_part1(struct sta_info * sta)995 static int __must_check __sta_info_destroy_part1(struct sta_info *sta)
996 {
997 struct ieee80211_local *local;
998 struct ieee80211_sub_if_data *sdata;
999 int ret;
1000
1001 might_sleep();
1002
1003 if (!sta)
1004 return -ENOENT;
1005
1006 local = sta->local;
1007 sdata = sta->sdata;
1008
1009 lockdep_assert_held(&local->sta_mtx);
1010
1011 /*
1012 * Before removing the station from the driver and
1013 * rate control, it might still start new aggregation
1014 * sessions -- block that to make sure the tear-down
1015 * will be sufficient.
1016 */
1017 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
1018 ieee80211_sta_tear_down_BA_sessions(sta, AGG_STOP_DESTROY_STA);
1019
1020 /*
1021 * Before removing the station from the driver there might be pending
1022 * rx frames on RSS queues sent prior to the disassociation - wait for
1023 * all such frames to be processed.
1024 */
1025 drv_sync_rx_queues(local, sta);
1026
1027 ret = sta_info_hash_del(local, sta);
1028 if (WARN_ON(ret))
1029 return ret;
1030
1031 /*
1032 * for TDLS peers, make sure to return to the base channel before
1033 * removal.
1034 */
1035 if (test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) {
1036 drv_tdls_cancel_channel_switch(local, sdata, &sta->sta);
1037 clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
1038 }
1039
1040 list_del_rcu(&sta->list);
1041 sta->removed = true;
1042
1043 if (sta->uploaded)
1044 drv_sta_pre_rcu_remove(local, sta->sdata, sta);
1045
1046 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1047 rcu_access_pointer(sdata->u.vlan.sta) == sta)
1048 RCU_INIT_POINTER(sdata->u.vlan.sta, NULL);
1049
1050 return 0;
1051 }
1052
__sta_info_destroy_part2(struct sta_info * sta)1053 static void __sta_info_destroy_part2(struct sta_info *sta)
1054 {
1055 struct ieee80211_local *local = sta->local;
1056 struct ieee80211_sub_if_data *sdata = sta->sdata;
1057 struct station_info *sinfo;
1058 int ret;
1059
1060 /*
1061 * NOTE: This assumes at least synchronize_net() was done
1062 * after _part1 and before _part2!
1063 */
1064
1065 might_sleep();
1066 lockdep_assert_held(&local->sta_mtx);
1067
1068 if (sta->sta_state == IEEE80211_STA_AUTHORIZED) {
1069 ret = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
1070 WARN_ON_ONCE(ret);
1071 }
1072
1073 /* now keys can no longer be reached */
1074 ieee80211_free_sta_keys(local, sta);
1075
1076 /* disable TIM bit - last chance to tell driver */
1077 __sta_info_recalc_tim(sta, true);
1078
1079 sta->dead = true;
1080
1081 local->num_sta--;
1082 local->sta_generation++;
1083
1084 while (sta->sta_state > IEEE80211_STA_NONE) {
1085 ret = sta_info_move_state(sta, sta->sta_state - 1);
1086 if (ret) {
1087 WARN_ON_ONCE(1);
1088 break;
1089 }
1090 }
1091
1092 if (sta->uploaded) {
1093 ret = drv_sta_state(local, sdata, sta, IEEE80211_STA_NONE,
1094 IEEE80211_STA_NOTEXIST);
1095 WARN_ON_ONCE(ret != 0);
1096 }
1097
1098 sta_dbg(sdata, "Removed STA %pM\n", sta->sta.addr);
1099
1100 sinfo = kzalloc(sizeof(*sinfo), GFP_KERNEL);
1101 if (sinfo)
1102 sta_set_sinfo(sta, sinfo, true);
1103 cfg80211_del_sta_sinfo(sdata->dev, sta->sta.addr, sinfo, GFP_KERNEL);
1104 kfree(sinfo);
1105
1106 ieee80211_sta_debugfs_remove(sta);
1107
1108 ieee80211_destroy_frag_cache(&sta->frags);
1109
1110 cleanup_single_sta(sta);
1111 }
1112
__sta_info_destroy(struct sta_info * sta)1113 int __must_check __sta_info_destroy(struct sta_info *sta)
1114 {
1115 int err = __sta_info_destroy_part1(sta);
1116
1117 if (err)
1118 return err;
1119
1120 synchronize_net();
1121
1122 __sta_info_destroy_part2(sta);
1123
1124 return 0;
1125 }
1126
sta_info_destroy_addr(struct ieee80211_sub_if_data * sdata,const u8 * addr)1127 int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, const u8 *addr)
1128 {
1129 struct sta_info *sta;
1130 int ret;
1131
1132 mutex_lock(&sdata->local->sta_mtx);
1133 sta = sta_info_get(sdata, addr);
1134 ret = __sta_info_destroy(sta);
1135 mutex_unlock(&sdata->local->sta_mtx);
1136
1137 return ret;
1138 }
1139
sta_info_destroy_addr_bss(struct ieee80211_sub_if_data * sdata,const u8 * addr)1140 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
1141 const u8 *addr)
1142 {
1143 struct sta_info *sta;
1144 int ret;
1145
1146 mutex_lock(&sdata->local->sta_mtx);
1147 sta = sta_info_get_bss(sdata, addr);
1148 ret = __sta_info_destroy(sta);
1149 mutex_unlock(&sdata->local->sta_mtx);
1150
1151 return ret;
1152 }
1153
sta_info_cleanup(struct timer_list * t)1154 static void sta_info_cleanup(struct timer_list *t)
1155 {
1156 struct ieee80211_local *local = from_timer(local, t, sta_cleanup);
1157 struct sta_info *sta;
1158 bool timer_needed = false;
1159
1160 rcu_read_lock();
1161 list_for_each_entry_rcu(sta, &local->sta_list, list)
1162 if (sta_info_cleanup_expire_buffered(local, sta))
1163 timer_needed = true;
1164 rcu_read_unlock();
1165
1166 if (local->quiescing)
1167 return;
1168
1169 if (!timer_needed)
1170 return;
1171
1172 mod_timer(&local->sta_cleanup,
1173 round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL));
1174 }
1175
sta_info_init(struct ieee80211_local * local)1176 int sta_info_init(struct ieee80211_local *local)
1177 {
1178 int err;
1179
1180 err = rhltable_init(&local->sta_hash, &sta_rht_params);
1181 if (err)
1182 return err;
1183
1184 spin_lock_init(&local->tim_lock);
1185 mutex_init(&local->sta_mtx);
1186 INIT_LIST_HEAD(&local->sta_list);
1187
1188 timer_setup(&local->sta_cleanup, sta_info_cleanup, 0);
1189 return 0;
1190 }
1191
sta_info_stop(struct ieee80211_local * local)1192 void sta_info_stop(struct ieee80211_local *local)
1193 {
1194 del_timer_sync(&local->sta_cleanup);
1195 rhltable_destroy(&local->sta_hash);
1196 }
1197
1198
__sta_info_flush(struct ieee80211_sub_if_data * sdata,bool vlans)1199 int __sta_info_flush(struct ieee80211_sub_if_data *sdata, bool vlans)
1200 {
1201 struct ieee80211_local *local = sdata->local;
1202 struct sta_info *sta, *tmp;
1203 LIST_HEAD(free_list);
1204 int ret = 0;
1205
1206 might_sleep();
1207
1208 WARN_ON(vlans && sdata->vif.type != NL80211_IFTYPE_AP);
1209 WARN_ON(vlans && !sdata->bss);
1210
1211 mutex_lock(&local->sta_mtx);
1212 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1213 if (sdata == sta->sdata ||
1214 (vlans && sdata->bss == sta->sdata->bss)) {
1215 if (!WARN_ON(__sta_info_destroy_part1(sta)))
1216 list_add(&sta->free_list, &free_list);
1217 ret++;
1218 }
1219 }
1220
1221 if (!list_empty(&free_list)) {
1222 synchronize_net();
1223 list_for_each_entry_safe(sta, tmp, &free_list, free_list)
1224 __sta_info_destroy_part2(sta);
1225 }
1226 mutex_unlock(&local->sta_mtx);
1227
1228 return ret;
1229 }
1230
ieee80211_sta_expire(struct ieee80211_sub_if_data * sdata,unsigned long exp_time)1231 void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
1232 unsigned long exp_time)
1233 {
1234 struct ieee80211_local *local = sdata->local;
1235 struct sta_info *sta, *tmp;
1236
1237 mutex_lock(&local->sta_mtx);
1238
1239 list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1240 unsigned long last_active = ieee80211_sta_last_active(sta);
1241
1242 if (sdata != sta->sdata)
1243 continue;
1244
1245 if (time_is_before_jiffies(last_active + exp_time)) {
1246 sta_dbg(sta->sdata, "expiring inactive STA %pM\n",
1247 sta->sta.addr);
1248
1249 if (ieee80211_vif_is_mesh(&sdata->vif) &&
1250 test_sta_flag(sta, WLAN_STA_PS_STA))
1251 atomic_dec(&sdata->u.mesh.ps.num_sta_ps);
1252
1253 WARN_ON(__sta_info_destroy(sta));
1254 }
1255 }
1256
1257 mutex_unlock(&local->sta_mtx);
1258 }
1259
ieee80211_find_sta_by_ifaddr(struct ieee80211_hw * hw,const u8 * addr,const u8 * localaddr)1260 struct ieee80211_sta *ieee80211_find_sta_by_ifaddr(struct ieee80211_hw *hw,
1261 const u8 *addr,
1262 const u8 *localaddr)
1263 {
1264 struct ieee80211_local *local = hw_to_local(hw);
1265 struct rhlist_head *tmp;
1266 struct sta_info *sta;
1267
1268 /*
1269 * Just return a random station if localaddr is NULL
1270 * ... first in list.
1271 */
1272 for_each_sta_info(local, addr, sta, tmp) {
1273 if (localaddr &&
1274 !ether_addr_equal(sta->sdata->vif.addr, localaddr))
1275 continue;
1276 if (!sta->uploaded)
1277 return NULL;
1278 return &sta->sta;
1279 }
1280
1281 return NULL;
1282 }
1283 EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr);
1284
ieee80211_find_sta(struct ieee80211_vif * vif,const u8 * addr)1285 struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif,
1286 const u8 *addr)
1287 {
1288 struct sta_info *sta;
1289
1290 if (!vif)
1291 return NULL;
1292
1293 sta = sta_info_get_bss(vif_to_sdata(vif), addr);
1294 if (!sta)
1295 return NULL;
1296
1297 if (!sta->uploaded)
1298 return NULL;
1299
1300 return &sta->sta;
1301 }
1302 EXPORT_SYMBOL(ieee80211_find_sta);
1303
1304 /* powersave support code */
ieee80211_sta_ps_deliver_wakeup(struct sta_info * sta)1305 void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta)
1306 {
1307 struct ieee80211_sub_if_data *sdata = sta->sdata;
1308 struct ieee80211_local *local = sdata->local;
1309 struct sk_buff_head pending;
1310 int filtered = 0, buffered = 0, ac, i;
1311 unsigned long flags;
1312 struct ps_data *ps;
1313
1314 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1315 sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
1316 u.ap);
1317
1318 if (sdata->vif.type == NL80211_IFTYPE_AP)
1319 ps = &sdata->bss->ps;
1320 else if (ieee80211_vif_is_mesh(&sdata->vif))
1321 ps = &sdata->u.mesh.ps;
1322 else
1323 return;
1324
1325 clear_sta_flag(sta, WLAN_STA_SP);
1326
1327 BUILD_BUG_ON(BITS_TO_LONGS(IEEE80211_NUM_TIDS) > 1);
1328 sta->driver_buffered_tids = 0;
1329 sta->txq_buffered_tids = 0;
1330
1331 if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
1332 drv_sta_notify(local, sdata, STA_NOTIFY_AWAKE, &sta->sta);
1333
1334 for (i = 0; i < ARRAY_SIZE(sta->sta.txq); i++) {
1335 if (!sta->sta.txq[i] || !txq_has_queue(sta->sta.txq[i]))
1336 continue;
1337
1338 schedule_and_wake_txq(local, to_txq_info(sta->sta.txq[i]));
1339 }
1340
1341 skb_queue_head_init(&pending);
1342
1343 /* sync with ieee80211_tx_h_unicast_ps_buf */
1344 spin_lock(&sta->ps_lock);
1345 /* Send all buffered frames to the station */
1346 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1347 int count = skb_queue_len(&pending), tmp;
1348
1349 spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
1350 skb_queue_splice_tail_init(&sta->tx_filtered[ac], &pending);
1351 spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
1352 tmp = skb_queue_len(&pending);
1353 filtered += tmp - count;
1354 count = tmp;
1355
1356 spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
1357 skb_queue_splice_tail_init(&sta->ps_tx_buf[ac], &pending);
1358 spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
1359 tmp = skb_queue_len(&pending);
1360 buffered += tmp - count;
1361 }
1362
1363 ieee80211_add_pending_skbs(local, &pending);
1364
1365 /* now we're no longer in the deliver code */
1366 clear_sta_flag(sta, WLAN_STA_PS_DELIVER);
1367
1368 /* The station might have polled and then woken up before we responded,
1369 * so clear these flags now to avoid them sticking around.
1370 */
1371 clear_sta_flag(sta, WLAN_STA_PSPOLL);
1372 clear_sta_flag(sta, WLAN_STA_UAPSD);
1373 spin_unlock(&sta->ps_lock);
1374
1375 atomic_dec(&ps->num_sta_ps);
1376
1377 local->total_ps_buffered -= buffered;
1378
1379 sta_info_recalc_tim(sta);
1380
1381 ps_dbg(sdata,
1382 "STA %pM aid %d sending %d filtered/%d PS frames since STA woke up\n",
1383 sta->sta.addr, sta->sta.aid, filtered, buffered);
1384
1385 ieee80211_check_fast_xmit(sta);
1386 }
1387
ieee80211_send_null_response(struct sta_info * sta,int tid,enum ieee80211_frame_release_type reason,bool call_driver,bool more_data)1388 static void ieee80211_send_null_response(struct sta_info *sta, int tid,
1389 enum ieee80211_frame_release_type reason,
1390 bool call_driver, bool more_data)
1391 {
1392 struct ieee80211_sub_if_data *sdata = sta->sdata;
1393 struct ieee80211_local *local = sdata->local;
1394 struct ieee80211_qos_hdr *nullfunc;
1395 struct sk_buff *skb;
1396 int size = sizeof(*nullfunc);
1397 __le16 fc;
1398 bool qos = sta->sta.wme;
1399 struct ieee80211_tx_info *info;
1400 struct ieee80211_chanctx_conf *chanctx_conf;
1401
1402 if (qos) {
1403 fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1404 IEEE80211_STYPE_QOS_NULLFUNC |
1405 IEEE80211_FCTL_FROMDS);
1406 } else {
1407 size -= 2;
1408 fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1409 IEEE80211_STYPE_NULLFUNC |
1410 IEEE80211_FCTL_FROMDS);
1411 }
1412
1413 skb = dev_alloc_skb(local->hw.extra_tx_headroom + size);
1414 if (!skb)
1415 return;
1416
1417 skb_reserve(skb, local->hw.extra_tx_headroom);
1418
1419 nullfunc = skb_put(skb, size);
1420 nullfunc->frame_control = fc;
1421 nullfunc->duration_id = 0;
1422 memcpy(nullfunc->addr1, sta->sta.addr, ETH_ALEN);
1423 memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
1424 memcpy(nullfunc->addr3, sdata->vif.addr, ETH_ALEN);
1425 nullfunc->seq_ctrl = 0;
1426
1427 skb->priority = tid;
1428 skb_set_queue_mapping(skb, ieee802_1d_to_ac[tid]);
1429 if (qos) {
1430 nullfunc->qos_ctrl = cpu_to_le16(tid);
1431
1432 if (reason == IEEE80211_FRAME_RELEASE_UAPSD) {
1433 nullfunc->qos_ctrl |=
1434 cpu_to_le16(IEEE80211_QOS_CTL_EOSP);
1435 if (more_data)
1436 nullfunc->frame_control |=
1437 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1438 }
1439 }
1440
1441 info = IEEE80211_SKB_CB(skb);
1442
1443 /*
1444 * Tell TX path to send this frame even though the
1445 * STA may still remain is PS mode after this frame
1446 * exchange. Also set EOSP to indicate this packet
1447 * ends the poll/service period.
1448 */
1449 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER |
1450 IEEE80211_TX_STATUS_EOSP |
1451 IEEE80211_TX_CTL_REQ_TX_STATUS;
1452
1453 info->control.flags |= IEEE80211_TX_CTRL_PS_RESPONSE;
1454
1455 if (call_driver)
1456 drv_allow_buffered_frames(local, sta, BIT(tid), 1,
1457 reason, false);
1458
1459 skb->dev = sdata->dev;
1460
1461 rcu_read_lock();
1462 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1463 if (WARN_ON(!chanctx_conf)) {
1464 rcu_read_unlock();
1465 kfree_skb(skb);
1466 return;
1467 }
1468
1469 info->band = chanctx_conf->def.chan->band;
1470 ieee80211_xmit(sdata, sta, skb);
1471 rcu_read_unlock();
1472 }
1473
find_highest_prio_tid(unsigned long tids)1474 static int find_highest_prio_tid(unsigned long tids)
1475 {
1476 /* lower 3 TIDs aren't ordered perfectly */
1477 if (tids & 0xF8)
1478 return fls(tids) - 1;
1479 /* TID 0 is BE just like TID 3 */
1480 if (tids & BIT(0))
1481 return 0;
1482 return fls(tids) - 1;
1483 }
1484
1485 /* Indicates if the MORE_DATA bit should be set in the last
1486 * frame obtained by ieee80211_sta_ps_get_frames.
1487 * Note that driver_release_tids is relevant only if
1488 * reason = IEEE80211_FRAME_RELEASE_PSPOLL
1489 */
1490 static bool
ieee80211_sta_ps_more_data(struct sta_info * sta,u8 ignored_acs,enum ieee80211_frame_release_type reason,unsigned long driver_release_tids)1491 ieee80211_sta_ps_more_data(struct sta_info *sta, u8 ignored_acs,
1492 enum ieee80211_frame_release_type reason,
1493 unsigned long driver_release_tids)
1494 {
1495 int ac;
1496
1497 /* If the driver has data on more than one TID then
1498 * certainly there's more data if we release just a
1499 * single frame now (from a single TID). This will
1500 * only happen for PS-Poll.
1501 */
1502 if (reason == IEEE80211_FRAME_RELEASE_PSPOLL &&
1503 hweight16(driver_release_tids) > 1)
1504 return true;
1505
1506 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1507 if (ignored_acs & ieee80211_ac_to_qos_mask[ac])
1508 continue;
1509
1510 if (!skb_queue_empty(&sta->tx_filtered[ac]) ||
1511 !skb_queue_empty(&sta->ps_tx_buf[ac]))
1512 return true;
1513 }
1514
1515 return false;
1516 }
1517
1518 static void
ieee80211_sta_ps_get_frames(struct sta_info * sta,int n_frames,u8 ignored_acs,enum ieee80211_frame_release_type reason,struct sk_buff_head * frames,unsigned long * driver_release_tids)1519 ieee80211_sta_ps_get_frames(struct sta_info *sta, int n_frames, u8 ignored_acs,
1520 enum ieee80211_frame_release_type reason,
1521 struct sk_buff_head *frames,
1522 unsigned long *driver_release_tids)
1523 {
1524 struct ieee80211_sub_if_data *sdata = sta->sdata;
1525 struct ieee80211_local *local = sdata->local;
1526 int ac;
1527
1528 /* Get response frame(s) and more data bit for the last one. */
1529 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1530 unsigned long tids;
1531
1532 if (ignored_acs & ieee80211_ac_to_qos_mask[ac])
1533 continue;
1534
1535 tids = ieee80211_tids_for_ac(ac);
1536
1537 /* if we already have frames from software, then we can't also
1538 * release from hardware queues
1539 */
1540 if (skb_queue_empty(frames)) {
1541 *driver_release_tids |=
1542 sta->driver_buffered_tids & tids;
1543 *driver_release_tids |= sta->txq_buffered_tids & tids;
1544 }
1545
1546 if (!*driver_release_tids) {
1547 struct sk_buff *skb;
1548
1549 while (n_frames > 0) {
1550 skb = skb_dequeue(&sta->tx_filtered[ac]);
1551 if (!skb) {
1552 skb = skb_dequeue(
1553 &sta->ps_tx_buf[ac]);
1554 if (skb)
1555 local->total_ps_buffered--;
1556 }
1557 if (!skb)
1558 break;
1559 n_frames--;
1560 __skb_queue_tail(frames, skb);
1561 }
1562 }
1563
1564 /* If we have more frames buffered on this AC, then abort the
1565 * loop since we can't send more data from other ACs before
1566 * the buffered frames from this.
1567 */
1568 if (!skb_queue_empty(&sta->tx_filtered[ac]) ||
1569 !skb_queue_empty(&sta->ps_tx_buf[ac]))
1570 break;
1571 }
1572 }
1573
1574 static void
ieee80211_sta_ps_deliver_response(struct sta_info * sta,int n_frames,u8 ignored_acs,enum ieee80211_frame_release_type reason)1575 ieee80211_sta_ps_deliver_response(struct sta_info *sta,
1576 int n_frames, u8 ignored_acs,
1577 enum ieee80211_frame_release_type reason)
1578 {
1579 struct ieee80211_sub_if_data *sdata = sta->sdata;
1580 struct ieee80211_local *local = sdata->local;
1581 unsigned long driver_release_tids = 0;
1582 struct sk_buff_head frames;
1583 bool more_data;
1584
1585 /* Service or PS-Poll period starts */
1586 set_sta_flag(sta, WLAN_STA_SP);
1587
1588 __skb_queue_head_init(&frames);
1589
1590 ieee80211_sta_ps_get_frames(sta, n_frames, ignored_acs, reason,
1591 &frames, &driver_release_tids);
1592
1593 more_data = ieee80211_sta_ps_more_data(sta, ignored_acs, reason, driver_release_tids);
1594
1595 if (driver_release_tids && reason == IEEE80211_FRAME_RELEASE_PSPOLL)
1596 driver_release_tids =
1597 BIT(find_highest_prio_tid(driver_release_tids));
1598
1599 if (skb_queue_empty(&frames) && !driver_release_tids) {
1600 int tid, ac;
1601
1602 /*
1603 * For PS-Poll, this can only happen due to a race condition
1604 * when we set the TIM bit and the station notices it, but
1605 * before it can poll for the frame we expire it.
1606 *
1607 * For uAPSD, this is said in the standard (11.2.1.5 h):
1608 * At each unscheduled SP for a non-AP STA, the AP shall
1609 * attempt to transmit at least one MSDU or MMPDU, but no
1610 * more than the value specified in the Max SP Length field
1611 * in the QoS Capability element from delivery-enabled ACs,
1612 * that are destined for the non-AP STA.
1613 *
1614 * Since we have no other MSDU/MMPDU, transmit a QoS null frame.
1615 */
1616
1617 /* This will evaluate to 1, 3, 5 or 7. */
1618 for (ac = IEEE80211_AC_VO; ac < IEEE80211_NUM_ACS; ac++)
1619 if (!(ignored_acs & ieee80211_ac_to_qos_mask[ac]))
1620 break;
1621 tid = 7 - 2 * ac;
1622
1623 ieee80211_send_null_response(sta, tid, reason, true, false);
1624 } else if (!driver_release_tids) {
1625 struct sk_buff_head pending;
1626 struct sk_buff *skb;
1627 int num = 0;
1628 u16 tids = 0;
1629 bool need_null = false;
1630
1631 skb_queue_head_init(&pending);
1632
1633 while ((skb = __skb_dequeue(&frames))) {
1634 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1635 struct ieee80211_hdr *hdr = (void *) skb->data;
1636 u8 *qoshdr = NULL;
1637
1638 num++;
1639
1640 /*
1641 * Tell TX path to send this frame even though the
1642 * STA may still remain is PS mode after this frame
1643 * exchange.
1644 */
1645 info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
1646 info->control.flags |= IEEE80211_TX_CTRL_PS_RESPONSE;
1647
1648 /*
1649 * Use MoreData flag to indicate whether there are
1650 * more buffered frames for this STA
1651 */
1652 if (more_data || !skb_queue_empty(&frames))
1653 hdr->frame_control |=
1654 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1655 else
1656 hdr->frame_control &=
1657 cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
1658
1659 if (ieee80211_is_data_qos(hdr->frame_control) ||
1660 ieee80211_is_qos_nullfunc(hdr->frame_control))
1661 qoshdr = ieee80211_get_qos_ctl(hdr);
1662
1663 tids |= BIT(skb->priority);
1664
1665 __skb_queue_tail(&pending, skb);
1666
1667 /* end service period after last frame or add one */
1668 if (!skb_queue_empty(&frames))
1669 continue;
1670
1671 if (reason != IEEE80211_FRAME_RELEASE_UAPSD) {
1672 /* for PS-Poll, there's only one frame */
1673 info->flags |= IEEE80211_TX_STATUS_EOSP |
1674 IEEE80211_TX_CTL_REQ_TX_STATUS;
1675 break;
1676 }
1677
1678 /* For uAPSD, things are a bit more complicated. If the
1679 * last frame has a QoS header (i.e. is a QoS-data or
1680 * QoS-nulldata frame) then just set the EOSP bit there
1681 * and be done.
1682 * If the frame doesn't have a QoS header (which means
1683 * it should be a bufferable MMPDU) then we can't set
1684 * the EOSP bit in the QoS header; add a QoS-nulldata
1685 * frame to the list to send it after the MMPDU.
1686 *
1687 * Note that this code is only in the mac80211-release
1688 * code path, we assume that the driver will not buffer
1689 * anything but QoS-data frames, or if it does, will
1690 * create the QoS-nulldata frame by itself if needed.
1691 *
1692 * Cf. 802.11-2012 10.2.1.10 (c).
1693 */
1694 if (qoshdr) {
1695 *qoshdr |= IEEE80211_QOS_CTL_EOSP;
1696
1697 info->flags |= IEEE80211_TX_STATUS_EOSP |
1698 IEEE80211_TX_CTL_REQ_TX_STATUS;
1699 } else {
1700 /* The standard isn't completely clear on this
1701 * as it says the more-data bit should be set
1702 * if there are more BUs. The QoS-Null frame
1703 * we're about to send isn't buffered yet, we
1704 * only create it below, but let's pretend it
1705 * was buffered just in case some clients only
1706 * expect more-data=0 when eosp=1.
1707 */
1708 hdr->frame_control |=
1709 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1710 need_null = true;
1711 num++;
1712 }
1713 break;
1714 }
1715
1716 drv_allow_buffered_frames(local, sta, tids, num,
1717 reason, more_data);
1718
1719 ieee80211_add_pending_skbs(local, &pending);
1720
1721 if (need_null)
1722 ieee80211_send_null_response(
1723 sta, find_highest_prio_tid(tids),
1724 reason, false, false);
1725
1726 sta_info_recalc_tim(sta);
1727 } else {
1728 int tid;
1729
1730 /*
1731 * We need to release a frame that is buffered somewhere in the
1732 * driver ... it'll have to handle that.
1733 * Note that the driver also has to check the number of frames
1734 * on the TIDs we're releasing from - if there are more than
1735 * n_frames it has to set the more-data bit (if we didn't ask
1736 * it to set it anyway due to other buffered frames); if there
1737 * are fewer than n_frames it has to make sure to adjust that
1738 * to allow the service period to end properly.
1739 */
1740 drv_release_buffered_frames(local, sta, driver_release_tids,
1741 n_frames, reason, more_data);
1742
1743 /*
1744 * Note that we don't recalculate the TIM bit here as it would
1745 * most likely have no effect at all unless the driver told us
1746 * that the TID(s) became empty before returning here from the
1747 * release function.
1748 * Either way, however, when the driver tells us that the TID(s)
1749 * became empty or we find that a txq became empty, we'll do the
1750 * TIM recalculation.
1751 */
1752
1753 if (!sta->sta.txq[0])
1754 return;
1755
1756 for (tid = 0; tid < ARRAY_SIZE(sta->sta.txq); tid++) {
1757 if (!sta->sta.txq[tid] ||
1758 !(driver_release_tids & BIT(tid)) ||
1759 txq_has_queue(sta->sta.txq[tid]))
1760 continue;
1761
1762 sta_info_recalc_tim(sta);
1763 break;
1764 }
1765 }
1766 }
1767
ieee80211_sta_ps_deliver_poll_response(struct sta_info * sta)1768 void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta)
1769 {
1770 u8 ignore_for_response = sta->sta.uapsd_queues;
1771
1772 /*
1773 * If all ACs are delivery-enabled then we should reply
1774 * from any of them, if only some are enabled we reply
1775 * only from the non-enabled ones.
1776 */
1777 if (ignore_for_response == BIT(IEEE80211_NUM_ACS) - 1)
1778 ignore_for_response = 0;
1779
1780 ieee80211_sta_ps_deliver_response(sta, 1, ignore_for_response,
1781 IEEE80211_FRAME_RELEASE_PSPOLL);
1782 }
1783
ieee80211_sta_ps_deliver_uapsd(struct sta_info * sta)1784 void ieee80211_sta_ps_deliver_uapsd(struct sta_info *sta)
1785 {
1786 int n_frames = sta->sta.max_sp;
1787 u8 delivery_enabled = sta->sta.uapsd_queues;
1788
1789 /*
1790 * If we ever grow support for TSPEC this might happen if
1791 * the TSPEC update from hostapd comes in between a trigger
1792 * frame setting WLAN_STA_UAPSD in the RX path and this
1793 * actually getting called.
1794 */
1795 if (!delivery_enabled)
1796 return;
1797
1798 switch (sta->sta.max_sp) {
1799 case 1:
1800 n_frames = 2;
1801 break;
1802 case 2:
1803 n_frames = 4;
1804 break;
1805 case 3:
1806 n_frames = 6;
1807 break;
1808 case 0:
1809 /* XXX: what is a good value? */
1810 n_frames = 128;
1811 break;
1812 }
1813
1814 ieee80211_sta_ps_deliver_response(sta, n_frames, ~delivery_enabled,
1815 IEEE80211_FRAME_RELEASE_UAPSD);
1816 }
1817
ieee80211_sta_block_awake(struct ieee80211_hw * hw,struct ieee80211_sta * pubsta,bool block)1818 void ieee80211_sta_block_awake(struct ieee80211_hw *hw,
1819 struct ieee80211_sta *pubsta, bool block)
1820 {
1821 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1822
1823 trace_api_sta_block_awake(sta->local, pubsta, block);
1824
1825 if (block) {
1826 set_sta_flag(sta, WLAN_STA_PS_DRIVER);
1827 ieee80211_clear_fast_xmit(sta);
1828 return;
1829 }
1830
1831 if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1832 return;
1833
1834 if (!test_sta_flag(sta, WLAN_STA_PS_STA)) {
1835 set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1836 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
1837 ieee80211_queue_work(hw, &sta->drv_deliver_wk);
1838 } else if (test_sta_flag(sta, WLAN_STA_PSPOLL) ||
1839 test_sta_flag(sta, WLAN_STA_UAPSD)) {
1840 /* must be asleep in this case */
1841 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
1842 ieee80211_queue_work(hw, &sta->drv_deliver_wk);
1843 } else {
1844 clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
1845 ieee80211_check_fast_xmit(sta);
1846 }
1847 }
1848 EXPORT_SYMBOL(ieee80211_sta_block_awake);
1849
ieee80211_sta_eosp(struct ieee80211_sta * pubsta)1850 void ieee80211_sta_eosp(struct ieee80211_sta *pubsta)
1851 {
1852 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1853 struct ieee80211_local *local = sta->local;
1854
1855 trace_api_eosp(local, pubsta);
1856
1857 clear_sta_flag(sta, WLAN_STA_SP);
1858 }
1859 EXPORT_SYMBOL(ieee80211_sta_eosp);
1860
ieee80211_send_eosp_nullfunc(struct ieee80211_sta * pubsta,int tid)1861 void ieee80211_send_eosp_nullfunc(struct ieee80211_sta *pubsta, int tid)
1862 {
1863 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1864 enum ieee80211_frame_release_type reason;
1865 bool more_data;
1866
1867 trace_api_send_eosp_nullfunc(sta->local, pubsta, tid);
1868
1869 reason = IEEE80211_FRAME_RELEASE_UAPSD;
1870 more_data = ieee80211_sta_ps_more_data(sta, ~sta->sta.uapsd_queues,
1871 reason, 0);
1872
1873 ieee80211_send_null_response(sta, tid, reason, false, more_data);
1874 }
1875 EXPORT_SYMBOL(ieee80211_send_eosp_nullfunc);
1876
ieee80211_sta_set_buffered(struct ieee80211_sta * pubsta,u8 tid,bool buffered)1877 void ieee80211_sta_set_buffered(struct ieee80211_sta *pubsta,
1878 u8 tid, bool buffered)
1879 {
1880 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1881
1882 if (WARN_ON(tid >= IEEE80211_NUM_TIDS))
1883 return;
1884
1885 trace_api_sta_set_buffered(sta->local, pubsta, tid, buffered);
1886
1887 if (buffered)
1888 set_bit(tid, &sta->driver_buffered_tids);
1889 else
1890 clear_bit(tid, &sta->driver_buffered_tids);
1891
1892 sta_info_recalc_tim(sta);
1893 }
1894 EXPORT_SYMBOL(ieee80211_sta_set_buffered);
1895
ieee80211_sta_register_airtime(struct ieee80211_sta * pubsta,u8 tid,u32 tx_airtime,u32 rx_airtime)1896 void ieee80211_sta_register_airtime(struct ieee80211_sta *pubsta, u8 tid,
1897 u32 tx_airtime, u32 rx_airtime)
1898 {
1899 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1900 struct ieee80211_local *local = sta->sdata->local;
1901 u8 ac = ieee80211_ac_from_tid(tid);
1902 u32 airtime = 0;
1903
1904 if (sta->local->airtime_flags & AIRTIME_USE_TX)
1905 airtime += tx_airtime;
1906 if (sta->local->airtime_flags & AIRTIME_USE_RX)
1907 airtime += rx_airtime;
1908
1909 spin_lock_bh(&local->active_txq_lock[ac]);
1910 sta->airtime[ac].tx_airtime += tx_airtime;
1911 sta->airtime[ac].rx_airtime += rx_airtime;
1912 sta->airtime[ac].deficit -= airtime;
1913 spin_unlock_bh(&local->active_txq_lock[ac]);
1914 }
1915 EXPORT_SYMBOL(ieee80211_sta_register_airtime);
1916
ieee80211_sta_update_pending_airtime(struct ieee80211_local * local,struct sta_info * sta,u8 ac,u16 tx_airtime,bool tx_completed)1917 void ieee80211_sta_update_pending_airtime(struct ieee80211_local *local,
1918 struct sta_info *sta, u8 ac,
1919 u16 tx_airtime, bool tx_completed)
1920 {
1921 int tx_pending;
1922
1923 if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL))
1924 return;
1925
1926 if (!tx_completed) {
1927 if (sta)
1928 atomic_add(tx_airtime,
1929 &sta->airtime[ac].aql_tx_pending);
1930
1931 atomic_add(tx_airtime, &local->aql_total_pending_airtime);
1932 return;
1933 }
1934
1935 if (sta) {
1936 tx_pending = atomic_sub_return(tx_airtime,
1937 &sta->airtime[ac].aql_tx_pending);
1938 if (tx_pending < 0)
1939 atomic_cmpxchg(&sta->airtime[ac].aql_tx_pending,
1940 tx_pending, 0);
1941 }
1942
1943 tx_pending = atomic_sub_return(tx_airtime,
1944 &local->aql_total_pending_airtime);
1945 if (WARN_ONCE(tx_pending < 0,
1946 "Device %s AC %d pending airtime underflow: %u, %u",
1947 wiphy_name(local->hw.wiphy), ac, tx_pending,
1948 tx_airtime))
1949 atomic_cmpxchg(&local->aql_total_pending_airtime,
1950 tx_pending, 0);
1951 }
1952
sta_info_move_state(struct sta_info * sta,enum ieee80211_sta_state new_state)1953 int sta_info_move_state(struct sta_info *sta,
1954 enum ieee80211_sta_state new_state)
1955 {
1956 might_sleep();
1957
1958 if (sta->sta_state == new_state)
1959 return 0;
1960
1961 /* check allowed transitions first */
1962
1963 switch (new_state) {
1964 case IEEE80211_STA_NONE:
1965 if (sta->sta_state != IEEE80211_STA_AUTH)
1966 return -EINVAL;
1967 break;
1968 case IEEE80211_STA_AUTH:
1969 if (sta->sta_state != IEEE80211_STA_NONE &&
1970 sta->sta_state != IEEE80211_STA_ASSOC)
1971 return -EINVAL;
1972 break;
1973 case IEEE80211_STA_ASSOC:
1974 if (sta->sta_state != IEEE80211_STA_AUTH &&
1975 sta->sta_state != IEEE80211_STA_AUTHORIZED)
1976 return -EINVAL;
1977 break;
1978 case IEEE80211_STA_AUTHORIZED:
1979 if (sta->sta_state != IEEE80211_STA_ASSOC)
1980 return -EINVAL;
1981 break;
1982 default:
1983 WARN(1, "invalid state %d", new_state);
1984 return -EINVAL;
1985 }
1986
1987 sta_dbg(sta->sdata, "moving STA %pM to state %d\n",
1988 sta->sta.addr, new_state);
1989
1990 /*
1991 * notify the driver before the actual changes so it can
1992 * fail the transition
1993 */
1994 if (test_sta_flag(sta, WLAN_STA_INSERTED)) {
1995 int err = drv_sta_state(sta->local, sta->sdata, sta,
1996 sta->sta_state, new_state);
1997 if (err)
1998 return err;
1999 }
2000
2001 /* reflect the change in all state variables */
2002
2003 switch (new_state) {
2004 case IEEE80211_STA_NONE:
2005 if (sta->sta_state == IEEE80211_STA_AUTH)
2006 clear_bit(WLAN_STA_AUTH, &sta->_flags);
2007 break;
2008 case IEEE80211_STA_AUTH:
2009 if (sta->sta_state == IEEE80211_STA_NONE) {
2010 set_bit(WLAN_STA_AUTH, &sta->_flags);
2011 } else if (sta->sta_state == IEEE80211_STA_ASSOC) {
2012 clear_bit(WLAN_STA_ASSOC, &sta->_flags);
2013 ieee80211_recalc_min_chandef(sta->sdata);
2014 if (!sta->sta.support_p2p_ps)
2015 ieee80211_recalc_p2p_go_ps_allowed(sta->sdata);
2016 }
2017 break;
2018 case IEEE80211_STA_ASSOC:
2019 if (sta->sta_state == IEEE80211_STA_AUTH) {
2020 set_bit(WLAN_STA_ASSOC, &sta->_flags);
2021 sta->assoc_at = ktime_get_boottime_ns();
2022 ieee80211_recalc_min_chandef(sta->sdata);
2023 if (!sta->sta.support_p2p_ps)
2024 ieee80211_recalc_p2p_go_ps_allowed(sta->sdata);
2025 } else if (sta->sta_state == IEEE80211_STA_AUTHORIZED) {
2026 ieee80211_vif_dec_num_mcast(sta->sdata);
2027 clear_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
2028 ieee80211_clear_fast_xmit(sta);
2029 ieee80211_clear_fast_rx(sta);
2030 }
2031 break;
2032 case IEEE80211_STA_AUTHORIZED:
2033 if (sta->sta_state == IEEE80211_STA_ASSOC) {
2034 ieee80211_vif_inc_num_mcast(sta->sdata);
2035 set_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
2036 ieee80211_check_fast_xmit(sta);
2037 ieee80211_check_fast_rx(sta);
2038 }
2039 if (sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
2040 sta->sdata->vif.type == NL80211_IFTYPE_AP)
2041 cfg80211_send_layer2_update(sta->sdata->dev,
2042 sta->sta.addr);
2043 break;
2044 default:
2045 break;
2046 }
2047
2048 sta->sta_state = new_state;
2049
2050 return 0;
2051 }
2052
sta_info_tx_streams(struct sta_info * sta)2053 u8 sta_info_tx_streams(struct sta_info *sta)
2054 {
2055 struct ieee80211_sta_ht_cap *ht_cap = &sta->sta.ht_cap;
2056 u8 rx_streams;
2057
2058 if (!sta->sta.ht_cap.ht_supported)
2059 return 1;
2060
2061 if (sta->sta.vht_cap.vht_supported) {
2062 int i;
2063 u16 tx_mcs_map =
2064 le16_to_cpu(sta->sta.vht_cap.vht_mcs.tx_mcs_map);
2065
2066 for (i = 7; i >= 0; i--)
2067 if ((tx_mcs_map & (0x3 << (i * 2))) !=
2068 IEEE80211_VHT_MCS_NOT_SUPPORTED)
2069 return i + 1;
2070 }
2071
2072 if (ht_cap->mcs.rx_mask[3])
2073 rx_streams = 4;
2074 else if (ht_cap->mcs.rx_mask[2])
2075 rx_streams = 3;
2076 else if (ht_cap->mcs.rx_mask[1])
2077 rx_streams = 2;
2078 else
2079 rx_streams = 1;
2080
2081 if (!(ht_cap->mcs.tx_params & IEEE80211_HT_MCS_TX_RX_DIFF))
2082 return rx_streams;
2083
2084 return ((ht_cap->mcs.tx_params & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
2085 >> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1;
2086 }
2087
2088 static struct ieee80211_sta_rx_stats *
sta_get_last_rx_stats(struct sta_info * sta)2089 sta_get_last_rx_stats(struct sta_info *sta)
2090 {
2091 struct ieee80211_sta_rx_stats *stats = &sta->rx_stats;
2092 int cpu;
2093
2094 if (!sta->pcpu_rx_stats)
2095 return stats;
2096
2097 for_each_possible_cpu(cpu) {
2098 struct ieee80211_sta_rx_stats *cpustats;
2099
2100 cpustats = per_cpu_ptr(sta->pcpu_rx_stats, cpu);
2101
2102 if (time_after(cpustats->last_rx, stats->last_rx))
2103 stats = cpustats;
2104 }
2105
2106 return stats;
2107 }
2108
sta_stats_decode_rate(struct ieee80211_local * local,u32 rate,struct rate_info * rinfo)2109 static void sta_stats_decode_rate(struct ieee80211_local *local, u32 rate,
2110 struct rate_info *rinfo)
2111 {
2112 rinfo->bw = STA_STATS_GET(BW, rate);
2113
2114 switch (STA_STATS_GET(TYPE, rate)) {
2115 case STA_STATS_RATE_TYPE_VHT:
2116 rinfo->flags = RATE_INFO_FLAGS_VHT_MCS;
2117 rinfo->mcs = STA_STATS_GET(VHT_MCS, rate);
2118 rinfo->nss = STA_STATS_GET(VHT_NSS, rate);
2119 if (STA_STATS_GET(SGI, rate))
2120 rinfo->flags |= RATE_INFO_FLAGS_SHORT_GI;
2121 break;
2122 case STA_STATS_RATE_TYPE_HT:
2123 rinfo->flags = RATE_INFO_FLAGS_MCS;
2124 rinfo->mcs = STA_STATS_GET(HT_MCS, rate);
2125 if (STA_STATS_GET(SGI, rate))
2126 rinfo->flags |= RATE_INFO_FLAGS_SHORT_GI;
2127 break;
2128 case STA_STATS_RATE_TYPE_LEGACY: {
2129 struct ieee80211_supported_band *sband;
2130 u16 brate;
2131 unsigned int shift;
2132 int band = STA_STATS_GET(LEGACY_BAND, rate);
2133 int rate_idx = STA_STATS_GET(LEGACY_IDX, rate);
2134
2135 sband = local->hw.wiphy->bands[band];
2136
2137 if (WARN_ON_ONCE(!sband->bitrates))
2138 break;
2139
2140 brate = sband->bitrates[rate_idx].bitrate;
2141 if (rinfo->bw == RATE_INFO_BW_5)
2142 shift = 2;
2143 else if (rinfo->bw == RATE_INFO_BW_10)
2144 shift = 1;
2145 else
2146 shift = 0;
2147 rinfo->legacy = DIV_ROUND_UP(brate, 1 << shift);
2148 break;
2149 }
2150 case STA_STATS_RATE_TYPE_HE:
2151 rinfo->flags = RATE_INFO_FLAGS_HE_MCS;
2152 rinfo->mcs = STA_STATS_GET(HE_MCS, rate);
2153 rinfo->nss = STA_STATS_GET(HE_NSS, rate);
2154 rinfo->he_gi = STA_STATS_GET(HE_GI, rate);
2155 rinfo->he_ru_alloc = STA_STATS_GET(HE_RU, rate);
2156 rinfo->he_dcm = STA_STATS_GET(HE_DCM, rate);
2157 break;
2158 }
2159 }
2160
sta_set_rate_info_rx(struct sta_info * sta,struct rate_info * rinfo)2161 static int sta_set_rate_info_rx(struct sta_info *sta, struct rate_info *rinfo)
2162 {
2163 u32 rate = READ_ONCE(sta_get_last_rx_stats(sta)->last_rate);
2164
2165 if (rate == STA_STATS_RATE_INVALID)
2166 return -EINVAL;
2167
2168 sta_stats_decode_rate(sta->local, rate, rinfo);
2169 return 0;
2170 }
2171
sta_get_tidstats_msdu(struct ieee80211_sta_rx_stats * rxstats,int tid)2172 static inline u64 sta_get_tidstats_msdu(struct ieee80211_sta_rx_stats *rxstats,
2173 int tid)
2174 {
2175 unsigned int start;
2176 u64 value;
2177
2178 do {
2179 start = u64_stats_fetch_begin_irq(&rxstats->syncp);
2180 value = rxstats->msdu[tid];
2181 } while (u64_stats_fetch_retry_irq(&rxstats->syncp, start));
2182
2183 return value;
2184 }
2185
sta_set_tidstats(struct sta_info * sta,struct cfg80211_tid_stats * tidstats,int tid)2186 static void sta_set_tidstats(struct sta_info *sta,
2187 struct cfg80211_tid_stats *tidstats,
2188 int tid)
2189 {
2190 struct ieee80211_local *local = sta->local;
2191 int cpu;
2192
2193 if (!(tidstats->filled & BIT(NL80211_TID_STATS_RX_MSDU))) {
2194 tidstats->rx_msdu += sta_get_tidstats_msdu(&sta->rx_stats, tid);
2195
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 tidstats->rx_msdu +=
2202 sta_get_tidstats_msdu(cpurxs, tid);
2203 }
2204 }
2205
2206 tidstats->filled |= BIT(NL80211_TID_STATS_RX_MSDU);
2207 }
2208
2209 if (!(tidstats->filled & BIT(NL80211_TID_STATS_TX_MSDU))) {
2210 tidstats->filled |= BIT(NL80211_TID_STATS_TX_MSDU);
2211 tidstats->tx_msdu = sta->tx_stats.msdu[tid];
2212 }
2213
2214 if (!(tidstats->filled & BIT(NL80211_TID_STATS_TX_MSDU_RETRIES)) &&
2215 ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
2216 tidstats->filled |= BIT(NL80211_TID_STATS_TX_MSDU_RETRIES);
2217 tidstats->tx_msdu_retries = sta->status_stats.msdu_retries[tid];
2218 }
2219
2220 if (!(tidstats->filled & BIT(NL80211_TID_STATS_TX_MSDU_FAILED)) &&
2221 ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
2222 tidstats->filled |= BIT(NL80211_TID_STATS_TX_MSDU_FAILED);
2223 tidstats->tx_msdu_failed = sta->status_stats.msdu_failed[tid];
2224 }
2225
2226 if (local->ops->wake_tx_queue && tid < IEEE80211_NUM_TIDS) {
2227 spin_lock_bh(&local->fq.lock);
2228 rcu_read_lock();
2229
2230 tidstats->filled |= BIT(NL80211_TID_STATS_TXQ_STATS);
2231 ieee80211_fill_txq_stats(&tidstats->txq_stats,
2232 to_txq_info(sta->sta.txq[tid]));
2233
2234 rcu_read_unlock();
2235 spin_unlock_bh(&local->fq.lock);
2236 }
2237 }
2238
sta_get_stats_bytes(struct ieee80211_sta_rx_stats * rxstats)2239 static inline u64 sta_get_stats_bytes(struct ieee80211_sta_rx_stats *rxstats)
2240 {
2241 unsigned int start;
2242 u64 value;
2243
2244 do {
2245 start = u64_stats_fetch_begin_irq(&rxstats->syncp);
2246 value = rxstats->bytes;
2247 } while (u64_stats_fetch_retry_irq(&rxstats->syncp, start));
2248
2249 return value;
2250 }
2251
sta_set_sinfo(struct sta_info * sta,struct station_info * sinfo,bool tidstats)2252 void sta_set_sinfo(struct sta_info *sta, struct station_info *sinfo,
2253 bool tidstats)
2254 {
2255 struct ieee80211_sub_if_data *sdata = sta->sdata;
2256 struct ieee80211_local *local = sdata->local;
2257 u32 thr = 0;
2258 int i, ac, cpu;
2259 struct ieee80211_sta_rx_stats *last_rxstats;
2260
2261 last_rxstats = sta_get_last_rx_stats(sta);
2262
2263 sinfo->generation = sdata->local->sta_generation;
2264
2265 /* do before driver, so beacon filtering drivers have a
2266 * chance to e.g. just add the number of filtered beacons
2267 * (or just modify the value entirely, of course)
2268 */
2269 if (sdata->vif.type == NL80211_IFTYPE_STATION)
2270 sinfo->rx_beacon = sdata->u.mgd.count_beacon_signal;
2271
2272 drv_sta_statistics(local, sdata, &sta->sta, sinfo);
2273 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_INACTIVE_TIME) |
2274 BIT_ULL(NL80211_STA_INFO_STA_FLAGS) |
2275 BIT_ULL(NL80211_STA_INFO_BSS_PARAM) |
2276 BIT_ULL(NL80211_STA_INFO_CONNECTED_TIME) |
2277 BIT_ULL(NL80211_STA_INFO_ASSOC_AT_BOOTTIME) |
2278 BIT_ULL(NL80211_STA_INFO_RX_DROP_MISC);
2279
2280 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2281 sinfo->beacon_loss_count = sdata->u.mgd.beacon_loss_count;
2282 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_BEACON_LOSS);
2283 }
2284
2285 sinfo->connected_time = ktime_get_seconds() - sta->last_connected;
2286 sinfo->assoc_at = sta->assoc_at;
2287 sinfo->inactive_time =
2288 jiffies_to_msecs(jiffies - ieee80211_sta_last_active(sta));
2289
2290 if (!(sinfo->filled & (BIT_ULL(NL80211_STA_INFO_TX_BYTES64) |
2291 BIT_ULL(NL80211_STA_INFO_TX_BYTES)))) {
2292 sinfo->tx_bytes = 0;
2293 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
2294 sinfo->tx_bytes += sta->tx_stats.bytes[ac];
2295 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_TX_BYTES64);
2296 }
2297
2298 if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_TX_PACKETS))) {
2299 sinfo->tx_packets = 0;
2300 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
2301 sinfo->tx_packets += sta->tx_stats.packets[ac];
2302 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_TX_PACKETS);
2303 }
2304
2305 if (!(sinfo->filled & (BIT_ULL(NL80211_STA_INFO_RX_BYTES64) |
2306 BIT_ULL(NL80211_STA_INFO_RX_BYTES)))) {
2307 sinfo->rx_bytes += sta_get_stats_bytes(&sta->rx_stats);
2308
2309 if (sta->pcpu_rx_stats) {
2310 for_each_possible_cpu(cpu) {
2311 struct ieee80211_sta_rx_stats *cpurxs;
2312
2313 cpurxs = per_cpu_ptr(sta->pcpu_rx_stats, cpu);
2314 sinfo->rx_bytes += sta_get_stats_bytes(cpurxs);
2315 }
2316 }
2317
2318 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_RX_BYTES64);
2319 }
2320
2321 if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_RX_PACKETS))) {
2322 sinfo->rx_packets = sta->rx_stats.packets;
2323 if (sta->pcpu_rx_stats) {
2324 for_each_possible_cpu(cpu) {
2325 struct ieee80211_sta_rx_stats *cpurxs;
2326
2327 cpurxs = per_cpu_ptr(sta->pcpu_rx_stats, cpu);
2328 sinfo->rx_packets += cpurxs->packets;
2329 }
2330 }
2331 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_RX_PACKETS);
2332 }
2333
2334 if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_TX_RETRIES))) {
2335 sinfo->tx_retries = sta->status_stats.retry_count;
2336 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_TX_RETRIES);
2337 }
2338
2339 if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_TX_FAILED))) {
2340 sinfo->tx_failed = sta->status_stats.retry_failed;
2341 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_TX_FAILED);
2342 }
2343
2344 if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_RX_DURATION))) {
2345 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
2346 sinfo->rx_duration += sta->airtime[ac].rx_airtime;
2347 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_RX_DURATION);
2348 }
2349
2350 if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_TX_DURATION))) {
2351 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
2352 sinfo->tx_duration += sta->airtime[ac].tx_airtime;
2353 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_TX_DURATION);
2354 }
2355
2356 if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_AIRTIME_WEIGHT))) {
2357 sinfo->airtime_weight = sta->airtime_weight;
2358 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_AIRTIME_WEIGHT);
2359 }
2360
2361 sinfo->rx_dropped_misc = sta->rx_stats.dropped;
2362 if (sta->pcpu_rx_stats) {
2363 for_each_possible_cpu(cpu) {
2364 struct ieee80211_sta_rx_stats *cpurxs;
2365
2366 cpurxs = per_cpu_ptr(sta->pcpu_rx_stats, cpu);
2367 sinfo->rx_dropped_misc += cpurxs->dropped;
2368 }
2369 }
2370
2371 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2372 !(sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)) {
2373 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_BEACON_RX) |
2374 BIT_ULL(NL80211_STA_INFO_BEACON_SIGNAL_AVG);
2375 sinfo->rx_beacon_signal_avg = ieee80211_ave_rssi(&sdata->vif);
2376 }
2377
2378 if (ieee80211_hw_check(&sta->local->hw, SIGNAL_DBM) ||
2379 ieee80211_hw_check(&sta->local->hw, SIGNAL_UNSPEC)) {
2380 if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_SIGNAL))) {
2381 sinfo->signal = (s8)last_rxstats->last_signal;
2382 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_SIGNAL);
2383 }
2384
2385 if (!sta->pcpu_rx_stats &&
2386 !(sinfo->filled & BIT_ULL(NL80211_STA_INFO_SIGNAL_AVG))) {
2387 sinfo->signal_avg =
2388 -ewma_signal_read(&sta->rx_stats_avg.signal);
2389 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_SIGNAL_AVG);
2390 }
2391 }
2392
2393 /* for the average - if pcpu_rx_stats isn't set - rxstats must point to
2394 * the sta->rx_stats struct, so the check here is fine with and without
2395 * pcpu statistics
2396 */
2397 if (last_rxstats->chains &&
2398 !(sinfo->filled & (BIT_ULL(NL80211_STA_INFO_CHAIN_SIGNAL) |
2399 BIT_ULL(NL80211_STA_INFO_CHAIN_SIGNAL_AVG)))) {
2400 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_CHAIN_SIGNAL);
2401 if (!sta->pcpu_rx_stats)
2402 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_CHAIN_SIGNAL_AVG);
2403
2404 sinfo->chains = last_rxstats->chains;
2405
2406 for (i = 0; i < ARRAY_SIZE(sinfo->chain_signal); i++) {
2407 sinfo->chain_signal[i] =
2408 last_rxstats->chain_signal_last[i];
2409 sinfo->chain_signal_avg[i] =
2410 -ewma_signal_read(&sta->rx_stats_avg.chain_signal[i]);
2411 }
2412 }
2413
2414 if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_TX_BITRATE))) {
2415 sta_set_rate_info_tx(sta, &sta->tx_stats.last_rate,
2416 &sinfo->txrate);
2417 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_TX_BITRATE);
2418 }
2419
2420 if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_RX_BITRATE))) {
2421 if (sta_set_rate_info_rx(sta, &sinfo->rxrate) == 0)
2422 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_RX_BITRATE);
2423 }
2424
2425 if (tidstats && !cfg80211_sinfo_alloc_tid_stats(sinfo, GFP_KERNEL)) {
2426 for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++)
2427 sta_set_tidstats(sta, &sinfo->pertid[i], i);
2428 }
2429
2430 if (ieee80211_vif_is_mesh(&sdata->vif)) {
2431 #ifdef CONFIG_MAC80211_MESH
2432 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_LLID) |
2433 BIT_ULL(NL80211_STA_INFO_PLID) |
2434 BIT_ULL(NL80211_STA_INFO_PLINK_STATE) |
2435 BIT_ULL(NL80211_STA_INFO_LOCAL_PM) |
2436 BIT_ULL(NL80211_STA_INFO_PEER_PM) |
2437 BIT_ULL(NL80211_STA_INFO_NONPEER_PM) |
2438 BIT_ULL(NL80211_STA_INFO_CONNECTED_TO_GATE) |
2439 BIT_ULL(NL80211_STA_INFO_CONNECTED_TO_AS);
2440
2441 sinfo->llid = sta->mesh->llid;
2442 sinfo->plid = sta->mesh->plid;
2443 sinfo->plink_state = sta->mesh->plink_state;
2444 if (test_sta_flag(sta, WLAN_STA_TOFFSET_KNOWN)) {
2445 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_T_OFFSET);
2446 sinfo->t_offset = sta->mesh->t_offset;
2447 }
2448 sinfo->local_pm = sta->mesh->local_pm;
2449 sinfo->peer_pm = sta->mesh->peer_pm;
2450 sinfo->nonpeer_pm = sta->mesh->nonpeer_pm;
2451 sinfo->connected_to_gate = sta->mesh->connected_to_gate;
2452 sinfo->connected_to_as = sta->mesh->connected_to_as;
2453 #endif
2454 }
2455
2456 sinfo->bss_param.flags = 0;
2457 if (sdata->vif.bss_conf.use_cts_prot)
2458 sinfo->bss_param.flags |= BSS_PARAM_FLAGS_CTS_PROT;
2459 if (sdata->vif.bss_conf.use_short_preamble)
2460 sinfo->bss_param.flags |= BSS_PARAM_FLAGS_SHORT_PREAMBLE;
2461 if (sdata->vif.bss_conf.use_short_slot)
2462 sinfo->bss_param.flags |= BSS_PARAM_FLAGS_SHORT_SLOT_TIME;
2463 sinfo->bss_param.dtim_period = sdata->vif.bss_conf.dtim_period;
2464 sinfo->bss_param.beacon_interval = sdata->vif.bss_conf.beacon_int;
2465
2466 sinfo->sta_flags.set = 0;
2467 sinfo->sta_flags.mask = BIT(NL80211_STA_FLAG_AUTHORIZED) |
2468 BIT(NL80211_STA_FLAG_SHORT_PREAMBLE) |
2469 BIT(NL80211_STA_FLAG_WME) |
2470 BIT(NL80211_STA_FLAG_MFP) |
2471 BIT(NL80211_STA_FLAG_AUTHENTICATED) |
2472 BIT(NL80211_STA_FLAG_ASSOCIATED) |
2473 BIT(NL80211_STA_FLAG_TDLS_PEER);
2474 if (test_sta_flag(sta, WLAN_STA_AUTHORIZED))
2475 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_AUTHORIZED);
2476 if (test_sta_flag(sta, WLAN_STA_SHORT_PREAMBLE))
2477 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_SHORT_PREAMBLE);
2478 if (sta->sta.wme)
2479 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_WME);
2480 if (test_sta_flag(sta, WLAN_STA_MFP))
2481 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_MFP);
2482 if (test_sta_flag(sta, WLAN_STA_AUTH))
2483 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_AUTHENTICATED);
2484 if (test_sta_flag(sta, WLAN_STA_ASSOC))
2485 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_ASSOCIATED);
2486 if (test_sta_flag(sta, WLAN_STA_TDLS_PEER))
2487 sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_TDLS_PEER);
2488
2489 thr = sta_get_expected_throughput(sta);
2490
2491 if (thr != 0) {
2492 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_EXPECTED_THROUGHPUT);
2493 sinfo->expected_throughput = thr;
2494 }
2495
2496 if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_ACK_SIGNAL)) &&
2497 sta->status_stats.ack_signal_filled) {
2498 sinfo->ack_signal = sta->status_stats.last_ack_signal;
2499 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_ACK_SIGNAL);
2500 }
2501
2502 if (!(sinfo->filled & BIT_ULL(NL80211_STA_INFO_ACK_SIGNAL_AVG)) &&
2503 sta->status_stats.ack_signal_filled) {
2504 sinfo->avg_ack_signal =
2505 -(s8)ewma_avg_signal_read(
2506 &sta->status_stats.avg_ack_signal);
2507 sinfo->filled |=
2508 BIT_ULL(NL80211_STA_INFO_ACK_SIGNAL_AVG);
2509 }
2510
2511 if (ieee80211_vif_is_mesh(&sdata->vif)) {
2512 sinfo->filled |= BIT_ULL(NL80211_STA_INFO_AIRTIME_LINK_METRIC);
2513 sinfo->airtime_link_metric =
2514 airtime_link_metric_get(local, sta);
2515 }
2516 }
2517
sta_get_expected_throughput(struct sta_info * sta)2518 u32 sta_get_expected_throughput(struct sta_info *sta)
2519 {
2520 struct ieee80211_sub_if_data *sdata = sta->sdata;
2521 struct ieee80211_local *local = sdata->local;
2522 struct rate_control_ref *ref = NULL;
2523 u32 thr = 0;
2524
2525 if (test_sta_flag(sta, WLAN_STA_RATE_CONTROL))
2526 ref = local->rate_ctrl;
2527
2528 /* check if the driver has a SW RC implementation */
2529 if (ref && ref->ops->get_expected_throughput)
2530 thr = ref->ops->get_expected_throughput(sta->rate_ctrl_priv);
2531 else
2532 thr = drv_get_expected_throughput(local, sta);
2533
2534 return thr;
2535 }
2536
ieee80211_sta_last_active(struct sta_info * sta)2537 unsigned long ieee80211_sta_last_active(struct sta_info *sta)
2538 {
2539 struct ieee80211_sta_rx_stats *stats = sta_get_last_rx_stats(sta);
2540
2541 if (!sta->status_stats.last_ack ||
2542 time_after(stats->last_rx, sta->status_stats.last_ack))
2543 return stats->last_rx;
2544 return sta->status_stats.last_ack;
2545 }
2546
sta_update_codel_params(struct sta_info * sta,u32 thr)2547 static void sta_update_codel_params(struct sta_info *sta, u32 thr)
2548 {
2549 if (!sta->sdata->local->ops->wake_tx_queue)
2550 return;
2551
2552 if (thr && thr < STA_SLOW_THRESHOLD * sta->local->num_sta) {
2553 sta->cparams.target = MS2TIME(50);
2554 sta->cparams.interval = MS2TIME(300);
2555 sta->cparams.ecn = false;
2556 } else {
2557 sta->cparams.target = MS2TIME(20);
2558 sta->cparams.interval = MS2TIME(100);
2559 sta->cparams.ecn = true;
2560 }
2561 }
2562
ieee80211_sta_set_expected_throughput(struct ieee80211_sta * pubsta,u32 thr)2563 void ieee80211_sta_set_expected_throughput(struct ieee80211_sta *pubsta,
2564 u32 thr)
2565 {
2566 struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
2567
2568 sta_update_codel_params(sta, thr);
2569 }
2570