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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  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 as
8  * published by the Free Software Foundation.
9  */
10 
11 #include <linux/module.h>
12 #include <linux/init.h>
13 #include <linux/etherdevice.h>
14 #include <linux/netdevice.h>
15 #include <linux/types.h>
16 #include <linux/slab.h>
17 #include <linux/skbuff.h>
18 #include <linux/if_arp.h>
19 #include <linux/timer.h>
20 #include <linux/rtnetlink.h>
21 
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 /* Caller must hold local->sta_mtx */
sta_info_hash_del(struct ieee80211_local * local,struct sta_info * sta)68 static int sta_info_hash_del(struct ieee80211_local *local,
69 			     struct sta_info *sta)
70 {
71 	struct sta_info *s;
72 
73 	s = rcu_dereference_protected(local->sta_hash[STA_HASH(sta->sta.addr)],
74 				      lockdep_is_held(&local->sta_mtx));
75 	if (!s)
76 		return -ENOENT;
77 	if (s == sta) {
78 		rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)],
79 				   s->hnext);
80 		return 0;
81 	}
82 
83 	while (rcu_access_pointer(s->hnext) &&
84 	       rcu_access_pointer(s->hnext) != sta)
85 		s = rcu_dereference_protected(s->hnext,
86 					lockdep_is_held(&local->sta_mtx));
87 	if (rcu_access_pointer(s->hnext)) {
88 		rcu_assign_pointer(s->hnext, sta->hnext);
89 		return 0;
90 	}
91 
92 	return -ENOENT;
93 }
94 
__cleanup_single_sta(struct sta_info * sta)95 static void __cleanup_single_sta(struct sta_info *sta)
96 {
97 	int ac, i;
98 	struct tid_ampdu_tx *tid_tx;
99 	struct ieee80211_sub_if_data *sdata = sta->sdata;
100 	struct ieee80211_local *local = sdata->local;
101 	struct ps_data *ps;
102 
103 	if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
104 	    test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
105 	    test_sta_flag(sta, WLAN_STA_PS_DELIVER)) {
106 		if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
107 		    sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
108 			ps = &sdata->bss->ps;
109 		else if (ieee80211_vif_is_mesh(&sdata->vif))
110 			ps = &sdata->u.mesh.ps;
111 		else
112 			return;
113 
114 		clear_sta_flag(sta, WLAN_STA_PS_STA);
115 		clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
116 		clear_sta_flag(sta, WLAN_STA_PS_DELIVER);
117 
118 		atomic_dec(&ps->num_sta_ps);
119 		sta_info_recalc_tim(sta);
120 	}
121 
122 	for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
123 		local->total_ps_buffered -= skb_queue_len(&sta->ps_tx_buf[ac]);
124 		ieee80211_purge_tx_queue(&local->hw, &sta->ps_tx_buf[ac]);
125 		ieee80211_purge_tx_queue(&local->hw, &sta->tx_filtered[ac]);
126 	}
127 
128 	if (ieee80211_vif_is_mesh(&sdata->vif))
129 		mesh_sta_cleanup(sta);
130 
131 	cancel_work_sync(&sta->drv_deliver_wk);
132 
133 	/*
134 	 * Destroy aggregation state here. It would be nice to wait for the
135 	 * driver to finish aggregation stop and then clean up, but for now
136 	 * drivers have to handle aggregation stop being requested, followed
137 	 * directly by station destruction.
138 	 */
139 	for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
140 		kfree(sta->ampdu_mlme.tid_start_tx[i]);
141 		tid_tx = rcu_dereference_raw(sta->ampdu_mlme.tid_tx[i]);
142 		if (!tid_tx)
143 			continue;
144 		ieee80211_purge_tx_queue(&local->hw, &tid_tx->pending);
145 		kfree(tid_tx);
146 	}
147 }
148 
cleanup_single_sta(struct sta_info * sta)149 static void cleanup_single_sta(struct sta_info *sta)
150 {
151 	struct ieee80211_sub_if_data *sdata = sta->sdata;
152 	struct ieee80211_local *local = sdata->local;
153 
154 	__cleanup_single_sta(sta);
155 	sta_info_free(local, sta);
156 }
157 
158 /* protected by RCU */
sta_info_get(struct ieee80211_sub_if_data * sdata,const u8 * addr)159 struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata,
160 			      const u8 *addr)
161 {
162 	struct ieee80211_local *local = sdata->local;
163 	struct sta_info *sta;
164 
165 	sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)],
166 				    lockdep_is_held(&local->sta_mtx));
167 	while (sta) {
168 		if (sta->sdata == sdata &&
169 		    ether_addr_equal(sta->sta.addr, addr))
170 			break;
171 		sta = rcu_dereference_check(sta->hnext,
172 					    lockdep_is_held(&local->sta_mtx));
173 	}
174 	return sta;
175 }
176 
177 /*
178  * Get sta info either from the specified interface
179  * or from one of its vlans
180  */
sta_info_get_bss(struct ieee80211_sub_if_data * sdata,const u8 * addr)181 struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata,
182 				  const u8 *addr)
183 {
184 	struct ieee80211_local *local = sdata->local;
185 	struct sta_info *sta;
186 
187 	sta = rcu_dereference_check(local->sta_hash[STA_HASH(addr)],
188 				    lockdep_is_held(&local->sta_mtx));
189 	while (sta) {
190 		if ((sta->sdata == sdata ||
191 		     (sta->sdata->bss && sta->sdata->bss == sdata->bss)) &&
192 		    ether_addr_equal(sta->sta.addr, addr))
193 			break;
194 		sta = rcu_dereference_check(sta->hnext,
195 					    lockdep_is_held(&local->sta_mtx));
196 	}
197 	return sta;
198 }
199 
sta_info_get_by_idx(struct ieee80211_sub_if_data * sdata,int idx)200 struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
201 				     int idx)
202 {
203 	struct ieee80211_local *local = sdata->local;
204 	struct sta_info *sta;
205 	int i = 0;
206 
207 	list_for_each_entry_rcu(sta, &local->sta_list, list) {
208 		if (sdata != sta->sdata)
209 			continue;
210 		if (i < idx) {
211 			++i;
212 			continue;
213 		}
214 		return sta;
215 	}
216 
217 	return NULL;
218 }
219 
220 /**
221  * sta_info_free - free STA
222  *
223  * @local: pointer to the global information
224  * @sta: STA info to free
225  *
226  * This function must undo everything done by sta_info_alloc()
227  * that may happen before sta_info_insert(). It may only be
228  * called when sta_info_insert() has not been attempted (and
229  * if that fails, the station is freed anyway.)
230  */
sta_info_free(struct ieee80211_local * local,struct sta_info * sta)231 void sta_info_free(struct ieee80211_local *local, struct sta_info *sta)
232 {
233 	int i;
234 
235 	if (sta->rate_ctrl)
236 		rate_control_free_sta(sta);
237 
238 	if (sta->tx_lat) {
239 		for (i = 0; i < IEEE80211_NUM_TIDS; i++)
240 			kfree(sta->tx_lat[i].bins);
241 		kfree(sta->tx_lat);
242 	}
243 
244 	sta_dbg(sta->sdata, "Destroyed STA %pM\n", sta->sta.addr);
245 
246 	kfree(rcu_dereference_raw(sta->sta.rates));
247 	kfree(sta);
248 }
249 
250 /* Caller must hold local->sta_mtx */
sta_info_hash_add(struct ieee80211_local * local,struct sta_info * sta)251 static void sta_info_hash_add(struct ieee80211_local *local,
252 			      struct sta_info *sta)
253 {
254 	lockdep_assert_held(&local->sta_mtx);
255 	sta->hnext = local->sta_hash[STA_HASH(sta->sta.addr)];
256 	rcu_assign_pointer(local->sta_hash[STA_HASH(sta->sta.addr)], sta);
257 }
258 
sta_deliver_ps_frames(struct work_struct * wk)259 static void sta_deliver_ps_frames(struct work_struct *wk)
260 {
261 	struct sta_info *sta;
262 
263 	sta = container_of(wk, struct sta_info, drv_deliver_wk);
264 
265 	if (sta->dead)
266 		return;
267 
268 	local_bh_disable();
269 	if (!test_sta_flag(sta, WLAN_STA_PS_STA))
270 		ieee80211_sta_ps_deliver_wakeup(sta);
271 	else if (test_and_clear_sta_flag(sta, WLAN_STA_PSPOLL))
272 		ieee80211_sta_ps_deliver_poll_response(sta);
273 	else if (test_and_clear_sta_flag(sta, WLAN_STA_UAPSD))
274 		ieee80211_sta_ps_deliver_uapsd(sta);
275 	local_bh_enable();
276 }
277 
sta_prepare_rate_control(struct ieee80211_local * local,struct sta_info * sta,gfp_t gfp)278 static int sta_prepare_rate_control(struct ieee80211_local *local,
279 				    struct sta_info *sta, gfp_t gfp)
280 {
281 	if (local->hw.flags & IEEE80211_HW_HAS_RATE_CONTROL)
282 		return 0;
283 
284 	sta->rate_ctrl = local->rate_ctrl;
285 	sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl,
286 						     &sta->sta, gfp);
287 	if (!sta->rate_ctrl_priv)
288 		return -ENOMEM;
289 
290 	return 0;
291 }
292 
sta_info_alloc(struct ieee80211_sub_if_data * sdata,const u8 * addr,gfp_t gfp)293 struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
294 				const u8 *addr, gfp_t gfp)
295 {
296 	struct ieee80211_local *local = sdata->local;
297 	struct sta_info *sta;
298 	struct timespec uptime;
299 	struct ieee80211_tx_latency_bin_ranges *tx_latency;
300 	int i;
301 
302 	sta = kzalloc(sizeof(*sta) + local->hw.sta_data_size, gfp);
303 	if (!sta)
304 		return NULL;
305 
306 	rcu_read_lock();
307 	tx_latency = rcu_dereference(local->tx_latency);
308 	/* init stations Tx latency statistics && TID bins */
309 	if (tx_latency) {
310 		sta->tx_lat = kzalloc(IEEE80211_NUM_TIDS *
311 				      sizeof(struct ieee80211_tx_latency_stat),
312 				      GFP_ATOMIC);
313 		if (!sta->tx_lat) {
314 			rcu_read_unlock();
315 			goto free;
316 		}
317 
318 		if (tx_latency->n_ranges) {
319 			for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
320 				/* size of bins is size of the ranges +1 */
321 				sta->tx_lat[i].bin_count =
322 					tx_latency->n_ranges + 1;
323 				sta->tx_lat[i].bins =
324 					kcalloc(sta->tx_lat[i].bin_count,
325 						sizeof(u32), GFP_ATOMIC);
326 				if (!sta->tx_lat[i].bins) {
327 					rcu_read_unlock();
328 					goto free;
329 				}
330 			}
331 		}
332 	}
333 	rcu_read_unlock();
334 
335 	spin_lock_init(&sta->lock);
336 	spin_lock_init(&sta->ps_lock);
337 	INIT_WORK(&sta->drv_deliver_wk, sta_deliver_ps_frames);
338 	INIT_WORK(&sta->ampdu_mlme.work, ieee80211_ba_session_work);
339 	mutex_init(&sta->ampdu_mlme.mtx);
340 #ifdef CONFIG_MAC80211_MESH
341 	if (ieee80211_vif_is_mesh(&sdata->vif) &&
342 	    !sdata->u.mesh.user_mpm)
343 		init_timer(&sta->plink_timer);
344 	sta->nonpeer_pm = NL80211_MESH_POWER_ACTIVE;
345 #endif
346 
347 	memcpy(sta->sta.addr, addr, ETH_ALEN);
348 	sta->local = local;
349 	sta->sdata = sdata;
350 	sta->last_rx = jiffies;
351 
352 	sta->sta_state = IEEE80211_STA_NONE;
353 
354 	ktime_get_ts(&uptime);
355 	sta->last_connected = uptime.tv_sec;
356 	ewma_init(&sta->avg_signal, 1024, 8);
357 	for (i = 0; i < ARRAY_SIZE(sta->chain_signal_avg); i++)
358 		ewma_init(&sta->chain_signal_avg[i], 1024, 8);
359 
360 	if (sta_prepare_rate_control(local, sta, gfp))
361 		goto free;
362 
363 	for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
364 		/*
365 		 * timer_to_tid must be initialized with identity mapping
366 		 * to enable session_timer's data differentiation. See
367 		 * sta_rx_agg_session_timer_expired for usage.
368 		 */
369 		sta->timer_to_tid[i] = i;
370 	}
371 	for (i = 0; i < IEEE80211_NUM_ACS; i++) {
372 		skb_queue_head_init(&sta->ps_tx_buf[i]);
373 		skb_queue_head_init(&sta->tx_filtered[i]);
374 	}
375 
376 	for (i = 0; i < IEEE80211_NUM_TIDS; i++)
377 		sta->last_seq_ctrl[i] = cpu_to_le16(USHRT_MAX);
378 
379 	sta->sta.smps_mode = IEEE80211_SMPS_OFF;
380 	if (sdata->vif.type == NL80211_IFTYPE_AP ||
381 	    sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
382 		struct ieee80211_supported_band *sband =
383 			local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
384 		u8 smps = (sband->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >>
385 				IEEE80211_HT_CAP_SM_PS_SHIFT;
386 		/*
387 		 * Assume that hostapd advertises our caps in the beacon and
388 		 * this is the known_smps_mode for a station that just assciated
389 		 */
390 		switch (smps) {
391 		case WLAN_HT_SMPS_CONTROL_DISABLED:
392 			sta->known_smps_mode = IEEE80211_SMPS_OFF;
393 			break;
394 		case WLAN_HT_SMPS_CONTROL_STATIC:
395 			sta->known_smps_mode = IEEE80211_SMPS_STATIC;
396 			break;
397 		case WLAN_HT_SMPS_CONTROL_DYNAMIC:
398 			sta->known_smps_mode = IEEE80211_SMPS_DYNAMIC;
399 			break;
400 		default:
401 			WARN_ON(1);
402 		}
403 	}
404 
405 	sta_dbg(sdata, "Allocated STA %pM\n", sta->sta.addr);
406 	return sta;
407 
408 free:
409 	if (sta->tx_lat) {
410 		for (i = 0; i < IEEE80211_NUM_TIDS; i++)
411 			kfree(sta->tx_lat[i].bins);
412 		kfree(sta->tx_lat);
413 	}
414 	kfree(sta);
415 	return NULL;
416 }
417 
sta_info_insert_check(struct sta_info * sta)418 static int sta_info_insert_check(struct sta_info *sta)
419 {
420 	struct ieee80211_sub_if_data *sdata = sta->sdata;
421 
422 	/*
423 	 * Can't be a WARN_ON because it can be triggered through a race:
424 	 * something inserts a STA (on one CPU) without holding the RTNL
425 	 * and another CPU turns off the net device.
426 	 */
427 	if (unlikely(!ieee80211_sdata_running(sdata)))
428 		return -ENETDOWN;
429 
430 	if (WARN_ON(ether_addr_equal(sta->sta.addr, sdata->vif.addr) ||
431 		    is_multicast_ether_addr(sta->sta.addr)))
432 		return -EINVAL;
433 
434 	return 0;
435 }
436 
sta_info_insert_drv_state(struct ieee80211_local * local,struct ieee80211_sub_if_data * sdata,struct sta_info * sta)437 static int sta_info_insert_drv_state(struct ieee80211_local *local,
438 				     struct ieee80211_sub_if_data *sdata,
439 				     struct sta_info *sta)
440 {
441 	enum ieee80211_sta_state state;
442 	int err = 0;
443 
444 	for (state = IEEE80211_STA_NOTEXIST; state < sta->sta_state; state++) {
445 		err = drv_sta_state(local, sdata, sta, state, state + 1);
446 		if (err)
447 			break;
448 	}
449 
450 	if (!err) {
451 		/*
452 		 * Drivers using legacy sta_add/sta_remove callbacks only
453 		 * get uploaded set to true after sta_add is called.
454 		 */
455 		if (!local->ops->sta_add)
456 			sta->uploaded = true;
457 		return 0;
458 	}
459 
460 	if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
461 		sdata_info(sdata,
462 			   "failed to move IBSS STA %pM to state %d (%d) - keeping it anyway\n",
463 			   sta->sta.addr, state + 1, err);
464 		err = 0;
465 	}
466 
467 	/* unwind on error */
468 	for (; state > IEEE80211_STA_NOTEXIST; state--)
469 		WARN_ON(drv_sta_state(local, sdata, sta, state, state - 1));
470 
471 	return err;
472 }
473 
474 /*
475  * should be called with sta_mtx locked
476  * this function replaces the mutex lock
477  * with a RCU lock
478  */
sta_info_insert_finish(struct sta_info * sta)479 static int sta_info_insert_finish(struct sta_info *sta) __acquires(RCU)
480 {
481 	struct ieee80211_local *local = sta->local;
482 	struct ieee80211_sub_if_data *sdata = sta->sdata;
483 	struct station_info sinfo;
484 	int err = 0;
485 
486 	lockdep_assert_held(&local->sta_mtx);
487 
488 	/* check if STA exists already */
489 	if (sta_info_get_bss(sdata, sta->sta.addr)) {
490 		err = -EEXIST;
491 		goto out_err;
492 	}
493 
494 	local->num_sta++;
495 	local->sta_generation++;
496 	smp_mb();
497 
498 	/* simplify things and don't accept BA sessions yet */
499 	set_sta_flag(sta, WLAN_STA_BLOCK_BA);
500 
501 	/* make the station visible */
502 	sta_info_hash_add(local, sta);
503 
504 	list_add_rcu(&sta->list, &local->sta_list);
505 
506 	/* notify driver */
507 	err = sta_info_insert_drv_state(local, sdata, sta);
508 	if (err)
509 		goto out_remove;
510 
511 	set_sta_flag(sta, WLAN_STA_INSERTED);
512 	/* accept BA sessions now */
513 	clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
514 
515 	ieee80211_recalc_min_chandef(sdata);
516 	ieee80211_sta_debugfs_add(sta);
517 	rate_control_add_sta_debugfs(sta);
518 
519 	memset(&sinfo, 0, sizeof(sinfo));
520 	sinfo.filled = 0;
521 	sinfo.generation = local->sta_generation;
522 	cfg80211_new_sta(sdata->dev, sta->sta.addr, &sinfo, GFP_KERNEL);
523 
524 	sta_dbg(sdata, "Inserted STA %pM\n", sta->sta.addr);
525 
526 	/* move reference to rcu-protected */
527 	rcu_read_lock();
528 	mutex_unlock(&local->sta_mtx);
529 
530 	if (ieee80211_vif_is_mesh(&sdata->vif))
531 		mesh_accept_plinks_update(sdata);
532 
533 	return 0;
534  out_remove:
535 	sta_info_hash_del(local, sta);
536 	list_del_rcu(&sta->list);
537 	local->num_sta--;
538 	synchronize_net();
539 	__cleanup_single_sta(sta);
540  out_err:
541 	mutex_unlock(&local->sta_mtx);
542 	rcu_read_lock();
543 	return err;
544 }
545 
sta_info_insert_rcu(struct sta_info * sta)546 int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU)
547 {
548 	struct ieee80211_local *local = sta->local;
549 	int err;
550 
551 	might_sleep();
552 
553 	err = sta_info_insert_check(sta);
554 	if (err) {
555 		rcu_read_lock();
556 		goto out_free;
557 	}
558 
559 	mutex_lock(&local->sta_mtx);
560 
561 	err = sta_info_insert_finish(sta);
562 	if (err)
563 		goto out_free;
564 
565 	return 0;
566  out_free:
567 	sta_info_free(local, sta);
568 	return err;
569 }
570 
sta_info_insert(struct sta_info * sta)571 int sta_info_insert(struct sta_info *sta)
572 {
573 	int err = sta_info_insert_rcu(sta);
574 
575 	rcu_read_unlock();
576 
577 	return err;
578 }
579 
__bss_tim_set(u8 * tim,u16 id)580 static inline void __bss_tim_set(u8 *tim, u16 id)
581 {
582 	/*
583 	 * This format has been mandated by the IEEE specifications,
584 	 * so this line may not be changed to use the __set_bit() format.
585 	 */
586 	tim[id / 8] |= (1 << (id % 8));
587 }
588 
__bss_tim_clear(u8 * tim,u16 id)589 static inline void __bss_tim_clear(u8 *tim, u16 id)
590 {
591 	/*
592 	 * This format has been mandated by the IEEE specifications,
593 	 * so this line may not be changed to use the __clear_bit() format.
594 	 */
595 	tim[id / 8] &= ~(1 << (id % 8));
596 }
597 
__bss_tim_get(u8 * tim,u16 id)598 static inline bool __bss_tim_get(u8 *tim, u16 id)
599 {
600 	/*
601 	 * This format has been mandated by the IEEE specifications,
602 	 * so this line may not be changed to use the test_bit() format.
603 	 */
604 	return tim[id / 8] & (1 << (id % 8));
605 }
606 
ieee80211_tids_for_ac(int ac)607 static unsigned long ieee80211_tids_for_ac(int ac)
608 {
609 	/* If we ever support TIDs > 7, this obviously needs to be adjusted */
610 	switch (ac) {
611 	case IEEE80211_AC_VO:
612 		return BIT(6) | BIT(7);
613 	case IEEE80211_AC_VI:
614 		return BIT(4) | BIT(5);
615 	case IEEE80211_AC_BE:
616 		return BIT(0) | BIT(3);
617 	case IEEE80211_AC_BK:
618 		return BIT(1) | BIT(2);
619 	default:
620 		WARN_ON(1);
621 		return 0;
622 	}
623 }
624 
sta_info_recalc_tim(struct sta_info * sta)625 void sta_info_recalc_tim(struct sta_info *sta)
626 {
627 	struct ieee80211_local *local = sta->local;
628 	struct ps_data *ps;
629 	bool indicate_tim = false;
630 	u8 ignore_for_tim = sta->sta.uapsd_queues;
631 	int ac;
632 	u16 id;
633 
634 	if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
635 	    sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
636 		if (WARN_ON_ONCE(!sta->sdata->bss))
637 			return;
638 
639 		ps = &sta->sdata->bss->ps;
640 		id = sta->sta.aid;
641 #ifdef CONFIG_MAC80211_MESH
642 	} else if (ieee80211_vif_is_mesh(&sta->sdata->vif)) {
643 		ps = &sta->sdata->u.mesh.ps;
644 		/* TIM map only for 1 <= PLID <= IEEE80211_MAX_AID */
645 		id = sta->plid % (IEEE80211_MAX_AID + 1);
646 #endif
647 	} else {
648 		return;
649 	}
650 
651 	/* No need to do anything if the driver does all */
652 	if (local->hw.flags & IEEE80211_HW_AP_LINK_PS)
653 		return;
654 
655 	if (sta->dead)
656 		goto done;
657 
658 	/*
659 	 * If all ACs are delivery-enabled then we should build
660 	 * the TIM bit for all ACs anyway; if only some are then
661 	 * we ignore those and build the TIM bit using only the
662 	 * non-enabled ones.
663 	 */
664 	if (ignore_for_tim == BIT(IEEE80211_NUM_ACS) - 1)
665 		ignore_for_tim = 0;
666 
667 	for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
668 		unsigned long tids;
669 
670 		if (ignore_for_tim & BIT(ac))
671 			continue;
672 
673 		indicate_tim |= !skb_queue_empty(&sta->tx_filtered[ac]) ||
674 				!skb_queue_empty(&sta->ps_tx_buf[ac]);
675 		if (indicate_tim)
676 			break;
677 
678 		tids = ieee80211_tids_for_ac(ac);
679 
680 		indicate_tim |=
681 			sta->driver_buffered_tids & tids;
682 	}
683 
684  done:
685 	spin_lock_bh(&local->tim_lock);
686 
687 	if (indicate_tim == __bss_tim_get(ps->tim, id))
688 		goto out_unlock;
689 
690 	if (indicate_tim)
691 		__bss_tim_set(ps->tim, id);
692 	else
693 		__bss_tim_clear(ps->tim, id);
694 
695 	if (local->ops->set_tim) {
696 		local->tim_in_locked_section = true;
697 		drv_set_tim(local, &sta->sta, indicate_tim);
698 		local->tim_in_locked_section = false;
699 	}
700 
701 out_unlock:
702 	spin_unlock_bh(&local->tim_lock);
703 }
704 
sta_info_buffer_expired(struct sta_info * sta,struct sk_buff * skb)705 static bool sta_info_buffer_expired(struct sta_info *sta, struct sk_buff *skb)
706 {
707 	struct ieee80211_tx_info *info;
708 	int timeout;
709 
710 	if (!skb)
711 		return false;
712 
713 	info = IEEE80211_SKB_CB(skb);
714 
715 	/* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
716 	timeout = (sta->listen_interval *
717 		   sta->sdata->vif.bss_conf.beacon_int *
718 		   32 / 15625) * HZ;
719 	if (timeout < STA_TX_BUFFER_EXPIRE)
720 		timeout = STA_TX_BUFFER_EXPIRE;
721 	return time_after(jiffies, info->control.jiffies + timeout);
722 }
723 
724 
sta_info_cleanup_expire_buffered_ac(struct ieee80211_local * local,struct sta_info * sta,int ac)725 static bool sta_info_cleanup_expire_buffered_ac(struct ieee80211_local *local,
726 						struct sta_info *sta, int ac)
727 {
728 	unsigned long flags;
729 	struct sk_buff *skb;
730 
731 	/*
732 	 * First check for frames that should expire on the filtered
733 	 * queue. Frames here were rejected by the driver and are on
734 	 * a separate queue to avoid reordering with normal PS-buffered
735 	 * frames. They also aren't accounted for right now in the
736 	 * total_ps_buffered counter.
737 	 */
738 	for (;;) {
739 		spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
740 		skb = skb_peek(&sta->tx_filtered[ac]);
741 		if (sta_info_buffer_expired(sta, skb))
742 			skb = __skb_dequeue(&sta->tx_filtered[ac]);
743 		else
744 			skb = NULL;
745 		spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
746 
747 		/*
748 		 * Frames are queued in order, so if this one
749 		 * hasn't expired yet we can stop testing. If
750 		 * we actually reached the end of the queue we
751 		 * also need to stop, of course.
752 		 */
753 		if (!skb)
754 			break;
755 		ieee80211_free_txskb(&local->hw, skb);
756 	}
757 
758 	/*
759 	 * Now also check the normal PS-buffered queue, this will
760 	 * only find something if the filtered queue was emptied
761 	 * since the filtered frames are all before the normal PS
762 	 * buffered frames.
763 	 */
764 	for (;;) {
765 		spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
766 		skb = skb_peek(&sta->ps_tx_buf[ac]);
767 		if (sta_info_buffer_expired(sta, skb))
768 			skb = __skb_dequeue(&sta->ps_tx_buf[ac]);
769 		else
770 			skb = NULL;
771 		spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
772 
773 		/*
774 		 * frames are queued in order, so if this one
775 		 * hasn't expired yet (or we reached the end of
776 		 * the queue) we can stop testing
777 		 */
778 		if (!skb)
779 			break;
780 
781 		local->total_ps_buffered--;
782 		ps_dbg(sta->sdata, "Buffered frame expired (STA %pM)\n",
783 		       sta->sta.addr);
784 		ieee80211_free_txskb(&local->hw, skb);
785 	}
786 
787 	/*
788 	 * Finally, recalculate the TIM bit for this station -- it might
789 	 * now be clear because the station was too slow to retrieve its
790 	 * frames.
791 	 */
792 	sta_info_recalc_tim(sta);
793 
794 	/*
795 	 * Return whether there are any frames still buffered, this is
796 	 * used to check whether the cleanup timer still needs to run,
797 	 * if there are no frames we don't need to rearm the timer.
798 	 */
799 	return !(skb_queue_empty(&sta->ps_tx_buf[ac]) &&
800 		 skb_queue_empty(&sta->tx_filtered[ac]));
801 }
802 
sta_info_cleanup_expire_buffered(struct ieee80211_local * local,struct sta_info * sta)803 static bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
804 					     struct sta_info *sta)
805 {
806 	bool have_buffered = false;
807 	int ac;
808 
809 	/* This is only necessary for stations on BSS/MBSS interfaces */
810 	if (!sta->sdata->bss &&
811 	    !ieee80211_vif_is_mesh(&sta->sdata->vif))
812 		return false;
813 
814 	for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
815 		have_buffered |=
816 			sta_info_cleanup_expire_buffered_ac(local, sta, ac);
817 
818 	return have_buffered;
819 }
820 
__sta_info_destroy_part1(struct sta_info * sta)821 static int __must_check __sta_info_destroy_part1(struct sta_info *sta)
822 {
823 	struct ieee80211_local *local;
824 	struct ieee80211_sub_if_data *sdata;
825 	int ret;
826 
827 	might_sleep();
828 
829 	if (!sta)
830 		return -ENOENT;
831 
832 	local = sta->local;
833 	sdata = sta->sdata;
834 
835 	lockdep_assert_held(&local->sta_mtx);
836 
837 	/*
838 	 * Before removing the station from the driver and
839 	 * rate control, it might still start new aggregation
840 	 * sessions -- block that to make sure the tear-down
841 	 * will be sufficient.
842 	 */
843 	set_sta_flag(sta, WLAN_STA_BLOCK_BA);
844 	ieee80211_sta_tear_down_BA_sessions(sta, AGG_STOP_DESTROY_STA);
845 
846 	ret = sta_info_hash_del(local, sta);
847 	if (WARN_ON(ret))
848 		return ret;
849 
850 	list_del_rcu(&sta->list);
851 
852 	drv_sta_pre_rcu_remove(local, sta->sdata, sta);
853 
854 	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
855 	    rcu_access_pointer(sdata->u.vlan.sta) == sta)
856 		RCU_INIT_POINTER(sdata->u.vlan.sta, NULL);
857 
858 	return 0;
859 }
860 
__sta_info_destroy_part2(struct sta_info * sta)861 static void __sta_info_destroy_part2(struct sta_info *sta)
862 {
863 	struct ieee80211_local *local = sta->local;
864 	struct ieee80211_sub_if_data *sdata = sta->sdata;
865 	int ret;
866 
867 	/*
868 	 * NOTE: This assumes at least synchronize_net() was done
869 	 *	 after _part1 and before _part2!
870 	 */
871 
872 	might_sleep();
873 	lockdep_assert_held(&local->sta_mtx);
874 
875 	/* now keys can no longer be reached */
876 	ieee80211_free_sta_keys(local, sta);
877 
878 	sta->dead = true;
879 
880 	local->num_sta--;
881 	local->sta_generation++;
882 
883 	while (sta->sta_state > IEEE80211_STA_NONE) {
884 		ret = sta_info_move_state(sta, sta->sta_state - 1);
885 		if (ret) {
886 			WARN_ON_ONCE(1);
887 			break;
888 		}
889 	}
890 
891 	if (sta->uploaded) {
892 		ret = drv_sta_state(local, sdata, sta, IEEE80211_STA_NONE,
893 				    IEEE80211_STA_NOTEXIST);
894 		WARN_ON_ONCE(ret != 0);
895 	}
896 
897 	sta_dbg(sdata, "Removed STA %pM\n", sta->sta.addr);
898 
899 	cfg80211_del_sta(sdata->dev, sta->sta.addr, GFP_KERNEL);
900 
901 	rate_control_remove_sta_debugfs(sta);
902 	ieee80211_sta_debugfs_remove(sta);
903 	ieee80211_recalc_min_chandef(sdata);
904 
905 	cleanup_single_sta(sta);
906 }
907 
__sta_info_destroy(struct sta_info * sta)908 int __must_check __sta_info_destroy(struct sta_info *sta)
909 {
910 	int err = __sta_info_destroy_part1(sta);
911 
912 	if (err)
913 		return err;
914 
915 	synchronize_net();
916 
917 	__sta_info_destroy_part2(sta);
918 
919 	return 0;
920 }
921 
sta_info_destroy_addr(struct ieee80211_sub_if_data * sdata,const u8 * addr)922 int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, const u8 *addr)
923 {
924 	struct sta_info *sta;
925 	int ret;
926 
927 	mutex_lock(&sdata->local->sta_mtx);
928 	sta = sta_info_get(sdata, addr);
929 	ret = __sta_info_destroy(sta);
930 	mutex_unlock(&sdata->local->sta_mtx);
931 
932 	return ret;
933 }
934 
sta_info_destroy_addr_bss(struct ieee80211_sub_if_data * sdata,const u8 * addr)935 int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
936 			      const u8 *addr)
937 {
938 	struct sta_info *sta;
939 	int ret;
940 
941 	mutex_lock(&sdata->local->sta_mtx);
942 	sta = sta_info_get_bss(sdata, addr);
943 	ret = __sta_info_destroy(sta);
944 	mutex_unlock(&sdata->local->sta_mtx);
945 
946 	return ret;
947 }
948 
sta_info_cleanup(unsigned long data)949 static void sta_info_cleanup(unsigned long data)
950 {
951 	struct ieee80211_local *local = (struct ieee80211_local *) data;
952 	struct sta_info *sta;
953 	bool timer_needed = false;
954 
955 	rcu_read_lock();
956 	list_for_each_entry_rcu(sta, &local->sta_list, list)
957 		if (sta_info_cleanup_expire_buffered(local, sta))
958 			timer_needed = true;
959 	rcu_read_unlock();
960 
961 	if (local->quiescing)
962 		return;
963 
964 	if (!timer_needed)
965 		return;
966 
967 	mod_timer(&local->sta_cleanup,
968 		  round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL));
969 }
970 
sta_info_init(struct ieee80211_local * local)971 void sta_info_init(struct ieee80211_local *local)
972 {
973 	spin_lock_init(&local->tim_lock);
974 	mutex_init(&local->sta_mtx);
975 	INIT_LIST_HEAD(&local->sta_list);
976 
977 	setup_timer(&local->sta_cleanup, sta_info_cleanup,
978 		    (unsigned long)local);
979 }
980 
sta_info_stop(struct ieee80211_local * local)981 void sta_info_stop(struct ieee80211_local *local)
982 {
983 	del_timer_sync(&local->sta_cleanup);
984 }
985 
986 
__sta_info_flush(struct ieee80211_sub_if_data * sdata,bool vlans)987 int __sta_info_flush(struct ieee80211_sub_if_data *sdata, bool vlans)
988 {
989 	struct ieee80211_local *local = sdata->local;
990 	struct sta_info *sta, *tmp;
991 	LIST_HEAD(free_list);
992 	int ret = 0;
993 
994 	might_sleep();
995 
996 	WARN_ON(vlans && sdata->vif.type != NL80211_IFTYPE_AP);
997 	WARN_ON(vlans && !sdata->bss);
998 
999 	mutex_lock(&local->sta_mtx);
1000 	list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1001 		if (sdata == sta->sdata ||
1002 		    (vlans && sdata->bss == sta->sdata->bss)) {
1003 			if (!WARN_ON(__sta_info_destroy_part1(sta)))
1004 				list_add(&sta->free_list, &free_list);
1005 			ret++;
1006 		}
1007 	}
1008 
1009 	if (!list_empty(&free_list)) {
1010 		synchronize_net();
1011 		list_for_each_entry_safe(sta, tmp, &free_list, free_list)
1012 			__sta_info_destroy_part2(sta);
1013 	}
1014 	mutex_unlock(&local->sta_mtx);
1015 
1016 	return ret;
1017 }
1018 
ieee80211_sta_expire(struct ieee80211_sub_if_data * sdata,unsigned long exp_time)1019 void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
1020 			  unsigned long exp_time)
1021 {
1022 	struct ieee80211_local *local = sdata->local;
1023 	struct sta_info *sta, *tmp;
1024 
1025 	mutex_lock(&local->sta_mtx);
1026 
1027 	list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1028 		if (sdata != sta->sdata)
1029 			continue;
1030 
1031 		if (time_after(jiffies, sta->last_rx + exp_time)) {
1032 			sta_dbg(sta->sdata, "expiring inactive STA %pM\n",
1033 				sta->sta.addr);
1034 
1035 			if (ieee80211_vif_is_mesh(&sdata->vif) &&
1036 			    test_sta_flag(sta, WLAN_STA_PS_STA))
1037 				atomic_dec(&sdata->u.mesh.ps.num_sta_ps);
1038 
1039 			WARN_ON(__sta_info_destroy(sta));
1040 		}
1041 	}
1042 
1043 	mutex_unlock(&local->sta_mtx);
1044 }
1045 
ieee80211_find_sta_by_ifaddr(struct ieee80211_hw * hw,const u8 * addr,const u8 * localaddr)1046 struct ieee80211_sta *ieee80211_find_sta_by_ifaddr(struct ieee80211_hw *hw,
1047 					       const u8 *addr,
1048 					       const u8 *localaddr)
1049 {
1050 	struct sta_info *sta, *nxt;
1051 
1052 	/*
1053 	 * Just return a random station if localaddr is NULL
1054 	 * ... first in list.
1055 	 */
1056 	for_each_sta_info(hw_to_local(hw), addr, sta, nxt) {
1057 		if (localaddr &&
1058 		    !ether_addr_equal(sta->sdata->vif.addr, localaddr))
1059 			continue;
1060 		if (!sta->uploaded)
1061 			return NULL;
1062 		return &sta->sta;
1063 	}
1064 
1065 	return NULL;
1066 }
1067 EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr);
1068 
ieee80211_find_sta(struct ieee80211_vif * vif,const u8 * addr)1069 struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif,
1070 					 const u8 *addr)
1071 {
1072 	struct sta_info *sta;
1073 
1074 	if (!vif)
1075 		return NULL;
1076 
1077 	sta = sta_info_get_bss(vif_to_sdata(vif), addr);
1078 	if (!sta)
1079 		return NULL;
1080 
1081 	if (!sta->uploaded)
1082 		return NULL;
1083 
1084 	return &sta->sta;
1085 }
1086 EXPORT_SYMBOL(ieee80211_find_sta);
1087 
1088 /* powersave support code */
ieee80211_sta_ps_deliver_wakeup(struct sta_info * sta)1089 void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta)
1090 {
1091 	struct ieee80211_sub_if_data *sdata = sta->sdata;
1092 	struct ieee80211_local *local = sdata->local;
1093 	struct sk_buff_head pending;
1094 	int filtered = 0, buffered = 0, ac;
1095 	unsigned long flags;
1096 	struct ps_data *ps;
1097 
1098 	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1099 		sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
1100 				     u.ap);
1101 
1102 	if (sdata->vif.type == NL80211_IFTYPE_AP)
1103 		ps = &sdata->bss->ps;
1104 	else if (ieee80211_vif_is_mesh(&sdata->vif))
1105 		ps = &sdata->u.mesh.ps;
1106 	else
1107 		return;
1108 
1109 	clear_sta_flag(sta, WLAN_STA_SP);
1110 
1111 	BUILD_BUG_ON(BITS_TO_LONGS(IEEE80211_NUM_TIDS) > 1);
1112 	sta->driver_buffered_tids = 0;
1113 
1114 	if (!(local->hw.flags & IEEE80211_HW_AP_LINK_PS))
1115 		drv_sta_notify(local, sdata, STA_NOTIFY_AWAKE, &sta->sta);
1116 
1117 	skb_queue_head_init(&pending);
1118 
1119 	/* sync with ieee80211_tx_h_unicast_ps_buf */
1120 	spin_lock(&sta->ps_lock);
1121 	/* Send all buffered frames to the station */
1122 	for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1123 		int count = skb_queue_len(&pending), tmp;
1124 
1125 		spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
1126 		skb_queue_splice_tail_init(&sta->tx_filtered[ac], &pending);
1127 		spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
1128 		tmp = skb_queue_len(&pending);
1129 		filtered += tmp - count;
1130 		count = tmp;
1131 
1132 		spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
1133 		skb_queue_splice_tail_init(&sta->ps_tx_buf[ac], &pending);
1134 		spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
1135 		tmp = skb_queue_len(&pending);
1136 		buffered += tmp - count;
1137 	}
1138 
1139 	ieee80211_add_pending_skbs(local, &pending);
1140 
1141 	/* now we're no longer in the deliver code */
1142 	clear_sta_flag(sta, WLAN_STA_PS_DELIVER);
1143 
1144 	/* The station might have polled and then woken up before we responded,
1145 	 * so clear these flags now to avoid them sticking around.
1146 	 */
1147 	clear_sta_flag(sta, WLAN_STA_PSPOLL);
1148 	clear_sta_flag(sta, WLAN_STA_UAPSD);
1149 	spin_unlock(&sta->ps_lock);
1150 
1151 	atomic_dec(&ps->num_sta_ps);
1152 
1153 	/* This station just woke up and isn't aware of our SMPS state */
1154 	if (!ieee80211_vif_is_mesh(&sdata->vif) &&
1155 	    !ieee80211_smps_is_restrictive(sta->known_smps_mode,
1156 					   sdata->smps_mode) &&
1157 	    sta->known_smps_mode != sdata->bss->req_smps &&
1158 	    sta_info_tx_streams(sta) != 1) {
1159 		ht_dbg(sdata,
1160 		       "%pM just woke up and MIMO capable - update SMPS\n",
1161 		       sta->sta.addr);
1162 		ieee80211_send_smps_action(sdata, sdata->bss->req_smps,
1163 					   sta->sta.addr,
1164 					   sdata->vif.bss_conf.bssid);
1165 	}
1166 
1167 	local->total_ps_buffered -= buffered;
1168 
1169 	sta_info_recalc_tim(sta);
1170 
1171 	ps_dbg(sdata,
1172 	       "STA %pM aid %d sending %d filtered/%d PS frames since STA not sleeping anymore\n",
1173 	       sta->sta.addr, sta->sta.aid, filtered, buffered);
1174 }
1175 
ieee80211_send_null_response(struct ieee80211_sub_if_data * sdata,struct sta_info * sta,int tid,enum ieee80211_frame_release_type reason,bool call_driver)1176 static void ieee80211_send_null_response(struct ieee80211_sub_if_data *sdata,
1177 					 struct sta_info *sta, int tid,
1178 					 enum ieee80211_frame_release_type reason,
1179 					 bool call_driver)
1180 {
1181 	struct ieee80211_local *local = sdata->local;
1182 	struct ieee80211_qos_hdr *nullfunc;
1183 	struct sk_buff *skb;
1184 	int size = sizeof(*nullfunc);
1185 	__le16 fc;
1186 	bool qos = sta->sta.wme;
1187 	struct ieee80211_tx_info *info;
1188 	struct ieee80211_chanctx_conf *chanctx_conf;
1189 
1190 	if (qos) {
1191 		fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1192 				 IEEE80211_STYPE_QOS_NULLFUNC |
1193 				 IEEE80211_FCTL_FROMDS);
1194 	} else {
1195 		size -= 2;
1196 		fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1197 				 IEEE80211_STYPE_NULLFUNC |
1198 				 IEEE80211_FCTL_FROMDS);
1199 	}
1200 
1201 	skb = dev_alloc_skb(local->hw.extra_tx_headroom + size);
1202 	if (!skb)
1203 		return;
1204 
1205 	skb_reserve(skb, local->hw.extra_tx_headroom);
1206 
1207 	nullfunc = (void *) skb_put(skb, size);
1208 	nullfunc->frame_control = fc;
1209 	nullfunc->duration_id = 0;
1210 	memcpy(nullfunc->addr1, sta->sta.addr, ETH_ALEN);
1211 	memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
1212 	memcpy(nullfunc->addr3, sdata->vif.addr, ETH_ALEN);
1213 	nullfunc->seq_ctrl = 0;
1214 
1215 	skb->priority = tid;
1216 	skb_set_queue_mapping(skb, ieee802_1d_to_ac[tid]);
1217 	if (qos) {
1218 		nullfunc->qos_ctrl = cpu_to_le16(tid);
1219 
1220 		if (reason == IEEE80211_FRAME_RELEASE_UAPSD)
1221 			nullfunc->qos_ctrl |=
1222 				cpu_to_le16(IEEE80211_QOS_CTL_EOSP);
1223 	}
1224 
1225 	info = IEEE80211_SKB_CB(skb);
1226 
1227 	/*
1228 	 * Tell TX path to send this frame even though the
1229 	 * STA may still remain is PS mode after this frame
1230 	 * exchange. Also set EOSP to indicate this packet
1231 	 * ends the poll/service period.
1232 	 */
1233 	info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER |
1234 		       IEEE80211_TX_CTL_PS_RESPONSE |
1235 		       IEEE80211_TX_STATUS_EOSP |
1236 		       IEEE80211_TX_CTL_REQ_TX_STATUS;
1237 
1238 	if (call_driver)
1239 		drv_allow_buffered_frames(local, sta, BIT(tid), 1,
1240 					  reason, false);
1241 
1242 	skb->dev = sdata->dev;
1243 
1244 	rcu_read_lock();
1245 	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1246 	if (WARN_ON(!chanctx_conf)) {
1247 		rcu_read_unlock();
1248 		kfree_skb(skb);
1249 		return;
1250 	}
1251 
1252 	ieee80211_xmit(sdata, skb, chanctx_conf->def.chan->band);
1253 	rcu_read_unlock();
1254 }
1255 
find_highest_prio_tid(unsigned long tids)1256 static int find_highest_prio_tid(unsigned long tids)
1257 {
1258 	/* lower 3 TIDs aren't ordered perfectly */
1259 	if (tids & 0xF8)
1260 		return fls(tids) - 1;
1261 	/* TID 0 is BE just like TID 3 */
1262 	if (tids & BIT(0))
1263 		return 0;
1264 	return fls(tids) - 1;
1265 }
1266 
1267 static void
ieee80211_sta_ps_deliver_response(struct sta_info * sta,int n_frames,u8 ignored_acs,enum ieee80211_frame_release_type reason)1268 ieee80211_sta_ps_deliver_response(struct sta_info *sta,
1269 				  int n_frames, u8 ignored_acs,
1270 				  enum ieee80211_frame_release_type reason)
1271 {
1272 	struct ieee80211_sub_if_data *sdata = sta->sdata;
1273 	struct ieee80211_local *local = sdata->local;
1274 	bool more_data = false;
1275 	int ac;
1276 	unsigned long driver_release_tids = 0;
1277 	struct sk_buff_head frames;
1278 
1279 	/* Service or PS-Poll period starts */
1280 	set_sta_flag(sta, WLAN_STA_SP);
1281 
1282 	__skb_queue_head_init(&frames);
1283 
1284 	/* Get response frame(s) and more data bit for the last one. */
1285 	for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1286 		unsigned long tids;
1287 
1288 		if (ignored_acs & BIT(ac))
1289 			continue;
1290 
1291 		tids = ieee80211_tids_for_ac(ac);
1292 
1293 		/* if we already have frames from software, then we can't also
1294 		 * release from hardware queues
1295 		 */
1296 		if (skb_queue_empty(&frames))
1297 			driver_release_tids |= sta->driver_buffered_tids & tids;
1298 
1299 		if (driver_release_tids) {
1300 			/* If the driver has data on more than one TID then
1301 			 * certainly there's more data if we release just a
1302 			 * single frame now (from a single TID). This will
1303 			 * only happen for PS-Poll.
1304 			 */
1305 			if (reason == IEEE80211_FRAME_RELEASE_PSPOLL &&
1306 			    hweight16(driver_release_tids) > 1) {
1307 				more_data = true;
1308 				driver_release_tids =
1309 					BIT(find_highest_prio_tid(
1310 						driver_release_tids));
1311 				break;
1312 			}
1313 		} else {
1314 			struct sk_buff *skb;
1315 
1316 			while (n_frames > 0) {
1317 				skb = skb_dequeue(&sta->tx_filtered[ac]);
1318 				if (!skb) {
1319 					skb = skb_dequeue(
1320 						&sta->ps_tx_buf[ac]);
1321 					if (skb)
1322 						local->total_ps_buffered--;
1323 				}
1324 				if (!skb)
1325 					break;
1326 				n_frames--;
1327 				__skb_queue_tail(&frames, skb);
1328 			}
1329 		}
1330 
1331 		/* If we have more frames buffered on this AC, then set the
1332 		 * more-data bit and abort the loop since we can't send more
1333 		 * data from other ACs before the buffered frames from this.
1334 		 */
1335 		if (!skb_queue_empty(&sta->tx_filtered[ac]) ||
1336 		    !skb_queue_empty(&sta->ps_tx_buf[ac])) {
1337 			more_data = true;
1338 			break;
1339 		}
1340 	}
1341 
1342 	if (skb_queue_empty(&frames) && !driver_release_tids) {
1343 		int tid;
1344 
1345 		/*
1346 		 * For PS-Poll, this can only happen due to a race condition
1347 		 * when we set the TIM bit and the station notices it, but
1348 		 * before it can poll for the frame we expire it.
1349 		 *
1350 		 * For uAPSD, this is said in the standard (11.2.1.5 h):
1351 		 *	At each unscheduled SP for a non-AP STA, the AP shall
1352 		 *	attempt to transmit at least one MSDU or MMPDU, but no
1353 		 *	more than the value specified in the Max SP Length field
1354 		 *	in the QoS Capability element from delivery-enabled ACs,
1355 		 *	that are destined for the non-AP STA.
1356 		 *
1357 		 * Since we have no other MSDU/MMPDU, transmit a QoS null frame.
1358 		 */
1359 
1360 		/* This will evaluate to 1, 3, 5 or 7. */
1361 		tid = 7 - ((ffs(~ignored_acs) - 1) << 1);
1362 
1363 		ieee80211_send_null_response(sdata, sta, tid, reason, true);
1364 	} else if (!driver_release_tids) {
1365 		struct sk_buff_head pending;
1366 		struct sk_buff *skb;
1367 		int num = 0;
1368 		u16 tids = 0;
1369 		bool need_null = false;
1370 
1371 		skb_queue_head_init(&pending);
1372 
1373 		while ((skb = __skb_dequeue(&frames))) {
1374 			struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1375 			struct ieee80211_hdr *hdr = (void *) skb->data;
1376 			u8 *qoshdr = NULL;
1377 
1378 			num++;
1379 
1380 			/*
1381 			 * Tell TX path to send this frame even though the
1382 			 * STA may still remain is PS mode after this frame
1383 			 * exchange.
1384 			 */
1385 			info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER |
1386 				       IEEE80211_TX_CTL_PS_RESPONSE;
1387 
1388 			/*
1389 			 * Use MoreData flag to indicate whether there are
1390 			 * more buffered frames for this STA
1391 			 */
1392 			if (more_data || !skb_queue_empty(&frames))
1393 				hdr->frame_control |=
1394 					cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1395 			else
1396 				hdr->frame_control &=
1397 					cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
1398 
1399 			if (ieee80211_is_data_qos(hdr->frame_control) ||
1400 			    ieee80211_is_qos_nullfunc(hdr->frame_control))
1401 				qoshdr = ieee80211_get_qos_ctl(hdr);
1402 
1403 			tids |= BIT(skb->priority);
1404 
1405 			__skb_queue_tail(&pending, skb);
1406 
1407 			/* end service period after last frame or add one */
1408 			if (!skb_queue_empty(&frames))
1409 				continue;
1410 
1411 			if (reason != IEEE80211_FRAME_RELEASE_UAPSD) {
1412 				/* for PS-Poll, there's only one frame */
1413 				info->flags |= IEEE80211_TX_STATUS_EOSP |
1414 					       IEEE80211_TX_CTL_REQ_TX_STATUS;
1415 				break;
1416 			}
1417 
1418 			/* For uAPSD, things are a bit more complicated. If the
1419 			 * last frame has a QoS header (i.e. is a QoS-data or
1420 			 * QoS-nulldata frame) then just set the EOSP bit there
1421 			 * and be done.
1422 			 * If the frame doesn't have a QoS header (which means
1423 			 * it should be a bufferable MMPDU) then we can't set
1424 			 * the EOSP bit in the QoS header; add a QoS-nulldata
1425 			 * frame to the list to send it after the MMPDU.
1426 			 *
1427 			 * Note that this code is only in the mac80211-release
1428 			 * code path, we assume that the driver will not buffer
1429 			 * anything but QoS-data frames, or if it does, will
1430 			 * create the QoS-nulldata frame by itself if needed.
1431 			 *
1432 			 * Cf. 802.11-2012 10.2.1.10 (c).
1433 			 */
1434 			if (qoshdr) {
1435 				*qoshdr |= IEEE80211_QOS_CTL_EOSP;
1436 
1437 				info->flags |= IEEE80211_TX_STATUS_EOSP |
1438 					       IEEE80211_TX_CTL_REQ_TX_STATUS;
1439 			} else {
1440 				/* The standard isn't completely clear on this
1441 				 * as it says the more-data bit should be set
1442 				 * if there are more BUs. The QoS-Null frame
1443 				 * we're about to send isn't buffered yet, we
1444 				 * only create it below, but let's pretend it
1445 				 * was buffered just in case some clients only
1446 				 * expect more-data=0 when eosp=1.
1447 				 */
1448 				hdr->frame_control |=
1449 					cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1450 				need_null = true;
1451 				num++;
1452 			}
1453 			break;
1454 		}
1455 
1456 		drv_allow_buffered_frames(local, sta, tids, num,
1457 					  reason, more_data);
1458 
1459 		ieee80211_add_pending_skbs(local, &pending);
1460 
1461 		if (need_null)
1462 			ieee80211_send_null_response(
1463 				sdata, sta, find_highest_prio_tid(tids),
1464 				reason, false);
1465 
1466 		sta_info_recalc_tim(sta);
1467 	} else {
1468 		/*
1469 		 * We need to release a frame that is buffered somewhere in the
1470 		 * driver ... it'll have to handle that.
1471 		 * Note that the driver also has to check the number of frames
1472 		 * on the TIDs we're releasing from - if there are more than
1473 		 * n_frames it has to set the more-data bit (if we didn't ask
1474 		 * it to set it anyway due to other buffered frames); if there
1475 		 * are fewer than n_frames it has to make sure to adjust that
1476 		 * to allow the service period to end properly.
1477 		 */
1478 		drv_release_buffered_frames(local, sta, driver_release_tids,
1479 					    n_frames, reason, more_data);
1480 
1481 		/*
1482 		 * Note that we don't recalculate the TIM bit here as it would
1483 		 * most likely have no effect at all unless the driver told us
1484 		 * that the TID(s) became empty before returning here from the
1485 		 * release function.
1486 		 * Either way, however, when the driver tells us that the TID(s)
1487 		 * became empty we'll do the TIM recalculation.
1488 		 */
1489 	}
1490 }
1491 
ieee80211_sta_ps_deliver_poll_response(struct sta_info * sta)1492 void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta)
1493 {
1494 	u8 ignore_for_response = sta->sta.uapsd_queues;
1495 
1496 	/*
1497 	 * If all ACs are delivery-enabled then we should reply
1498 	 * from any of them, if only some are enabled we reply
1499 	 * only from the non-enabled ones.
1500 	 */
1501 	if (ignore_for_response == BIT(IEEE80211_NUM_ACS) - 1)
1502 		ignore_for_response = 0;
1503 
1504 	ieee80211_sta_ps_deliver_response(sta, 1, ignore_for_response,
1505 					  IEEE80211_FRAME_RELEASE_PSPOLL);
1506 }
1507 
ieee80211_sta_ps_deliver_uapsd(struct sta_info * sta)1508 void ieee80211_sta_ps_deliver_uapsd(struct sta_info *sta)
1509 {
1510 	int n_frames = sta->sta.max_sp;
1511 	u8 delivery_enabled = sta->sta.uapsd_queues;
1512 
1513 	/*
1514 	 * If we ever grow support for TSPEC this might happen if
1515 	 * the TSPEC update from hostapd comes in between a trigger
1516 	 * frame setting WLAN_STA_UAPSD in the RX path and this
1517 	 * actually getting called.
1518 	 */
1519 	if (!delivery_enabled)
1520 		return;
1521 
1522 	switch (sta->sta.max_sp) {
1523 	case 1:
1524 		n_frames = 2;
1525 		break;
1526 	case 2:
1527 		n_frames = 4;
1528 		break;
1529 	case 3:
1530 		n_frames = 6;
1531 		break;
1532 	case 0:
1533 		/* XXX: what is a good value? */
1534 		n_frames = 8;
1535 		break;
1536 	}
1537 
1538 	ieee80211_sta_ps_deliver_response(sta, n_frames, ~delivery_enabled,
1539 					  IEEE80211_FRAME_RELEASE_UAPSD);
1540 }
1541 
ieee80211_sta_block_awake(struct ieee80211_hw * hw,struct ieee80211_sta * pubsta,bool block)1542 void ieee80211_sta_block_awake(struct ieee80211_hw *hw,
1543 			       struct ieee80211_sta *pubsta, bool block)
1544 {
1545 	struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1546 
1547 	trace_api_sta_block_awake(sta->local, pubsta, block);
1548 
1549 	if (block) {
1550 		set_sta_flag(sta, WLAN_STA_PS_DRIVER);
1551 		return;
1552 	}
1553 
1554 	if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1555 		return;
1556 
1557 	if (!test_sta_flag(sta, WLAN_STA_PS_STA)) {
1558 		set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1559 		clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
1560 		ieee80211_queue_work(hw, &sta->drv_deliver_wk);
1561 	} else if (test_sta_flag(sta, WLAN_STA_PSPOLL) ||
1562 		   test_sta_flag(sta, WLAN_STA_UAPSD)) {
1563 		/* must be asleep in this case */
1564 		clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
1565 		ieee80211_queue_work(hw, &sta->drv_deliver_wk);
1566 	} else {
1567 		clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
1568 	}
1569 }
1570 EXPORT_SYMBOL(ieee80211_sta_block_awake);
1571 
ieee80211_sta_eosp(struct ieee80211_sta * pubsta)1572 void ieee80211_sta_eosp(struct ieee80211_sta *pubsta)
1573 {
1574 	struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1575 	struct ieee80211_local *local = sta->local;
1576 
1577 	trace_api_eosp(local, pubsta);
1578 
1579 	clear_sta_flag(sta, WLAN_STA_SP);
1580 }
1581 EXPORT_SYMBOL(ieee80211_sta_eosp);
1582 
ieee80211_sta_set_buffered(struct ieee80211_sta * pubsta,u8 tid,bool buffered)1583 void ieee80211_sta_set_buffered(struct ieee80211_sta *pubsta,
1584 				u8 tid, bool buffered)
1585 {
1586 	struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1587 
1588 	if (WARN_ON(tid >= IEEE80211_NUM_TIDS))
1589 		return;
1590 
1591 	trace_api_sta_set_buffered(sta->local, pubsta, tid, buffered);
1592 
1593 	if (buffered)
1594 		set_bit(tid, &sta->driver_buffered_tids);
1595 	else
1596 		clear_bit(tid, &sta->driver_buffered_tids);
1597 
1598 	sta_info_recalc_tim(sta);
1599 }
1600 EXPORT_SYMBOL(ieee80211_sta_set_buffered);
1601 
sta_info_move_state(struct sta_info * sta,enum ieee80211_sta_state new_state)1602 int sta_info_move_state(struct sta_info *sta,
1603 			enum ieee80211_sta_state new_state)
1604 {
1605 	might_sleep();
1606 
1607 	if (sta->sta_state == new_state)
1608 		return 0;
1609 
1610 	/* check allowed transitions first */
1611 
1612 	switch (new_state) {
1613 	case IEEE80211_STA_NONE:
1614 		if (sta->sta_state != IEEE80211_STA_AUTH)
1615 			return -EINVAL;
1616 		break;
1617 	case IEEE80211_STA_AUTH:
1618 		if (sta->sta_state != IEEE80211_STA_NONE &&
1619 		    sta->sta_state != IEEE80211_STA_ASSOC)
1620 			return -EINVAL;
1621 		break;
1622 	case IEEE80211_STA_ASSOC:
1623 		if (sta->sta_state != IEEE80211_STA_AUTH &&
1624 		    sta->sta_state != IEEE80211_STA_AUTHORIZED)
1625 			return -EINVAL;
1626 		break;
1627 	case IEEE80211_STA_AUTHORIZED:
1628 		if (sta->sta_state != IEEE80211_STA_ASSOC)
1629 			return -EINVAL;
1630 		break;
1631 	default:
1632 		WARN(1, "invalid state %d", new_state);
1633 		return -EINVAL;
1634 	}
1635 
1636 	sta_dbg(sta->sdata, "moving STA %pM to state %d\n",
1637 		sta->sta.addr, new_state);
1638 
1639 	/*
1640 	 * notify the driver before the actual changes so it can
1641 	 * fail the transition
1642 	 */
1643 	if (test_sta_flag(sta, WLAN_STA_INSERTED)) {
1644 		int err = drv_sta_state(sta->local, sta->sdata, sta,
1645 					sta->sta_state, new_state);
1646 		if (err)
1647 			return err;
1648 	}
1649 
1650 	/* reflect the change in all state variables */
1651 
1652 	switch (new_state) {
1653 	case IEEE80211_STA_NONE:
1654 		if (sta->sta_state == IEEE80211_STA_AUTH)
1655 			clear_bit(WLAN_STA_AUTH, &sta->_flags);
1656 		break;
1657 	case IEEE80211_STA_AUTH:
1658 		if (sta->sta_state == IEEE80211_STA_NONE)
1659 			set_bit(WLAN_STA_AUTH, &sta->_flags);
1660 		else if (sta->sta_state == IEEE80211_STA_ASSOC)
1661 			clear_bit(WLAN_STA_ASSOC, &sta->_flags);
1662 		break;
1663 	case IEEE80211_STA_ASSOC:
1664 		if (sta->sta_state == IEEE80211_STA_AUTH) {
1665 			set_bit(WLAN_STA_ASSOC, &sta->_flags);
1666 		} else if (sta->sta_state == IEEE80211_STA_AUTHORIZED) {
1667 			if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1668 			    (sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1669 			     !sta->sdata->u.vlan.sta))
1670 				atomic_dec(&sta->sdata->bss->num_mcast_sta);
1671 			clear_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
1672 		}
1673 		break;
1674 	case IEEE80211_STA_AUTHORIZED:
1675 		if (sta->sta_state == IEEE80211_STA_ASSOC) {
1676 			if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
1677 			    (sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
1678 			     !sta->sdata->u.vlan.sta))
1679 				atomic_inc(&sta->sdata->bss->num_mcast_sta);
1680 			set_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
1681 		}
1682 		break;
1683 	default:
1684 		break;
1685 	}
1686 
1687 	sta->sta_state = new_state;
1688 
1689 	return 0;
1690 }
1691 
sta_info_tx_streams(struct sta_info * sta)1692 u8 sta_info_tx_streams(struct sta_info *sta)
1693 {
1694 	struct ieee80211_sta_ht_cap *ht_cap = &sta->sta.ht_cap;
1695 	u8 rx_streams;
1696 
1697 	if (!sta->sta.ht_cap.ht_supported)
1698 		return 1;
1699 
1700 	if (sta->sta.vht_cap.vht_supported) {
1701 		int i;
1702 		u16 tx_mcs_map =
1703 			le16_to_cpu(sta->sta.vht_cap.vht_mcs.tx_mcs_map);
1704 
1705 		for (i = 7; i >= 0; i--)
1706 			if ((tx_mcs_map & (0x3 << (i * 2))) !=
1707 			    IEEE80211_VHT_MCS_NOT_SUPPORTED)
1708 				return i + 1;
1709 	}
1710 
1711 	if (ht_cap->mcs.rx_mask[3])
1712 		rx_streams = 4;
1713 	else if (ht_cap->mcs.rx_mask[2])
1714 		rx_streams = 3;
1715 	else if (ht_cap->mcs.rx_mask[1])
1716 		rx_streams = 2;
1717 	else
1718 		rx_streams = 1;
1719 
1720 	if (!(ht_cap->mcs.tx_params & IEEE80211_HT_MCS_TX_RX_DIFF))
1721 		return rx_streams;
1722 
1723 	return ((ht_cap->mcs.tx_params & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
1724 			>> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1;
1725 }
1726 
sta_set_sinfo(struct sta_info * sta,struct station_info * sinfo)1727 void sta_set_sinfo(struct sta_info *sta, struct station_info *sinfo)
1728 {
1729 	struct ieee80211_sub_if_data *sdata = sta->sdata;
1730 	struct ieee80211_local *local = sdata->local;
1731 	struct rate_control_ref *ref = NULL;
1732 	struct timespec uptime;
1733 	u64 packets = 0;
1734 	u32 thr = 0;
1735 	int i, ac;
1736 
1737 	if (test_sta_flag(sta, WLAN_STA_RATE_CONTROL))
1738 		ref = local->rate_ctrl;
1739 
1740 	sinfo->generation = sdata->local->sta_generation;
1741 
1742 	sinfo->filled = STATION_INFO_INACTIVE_TIME |
1743 			STATION_INFO_RX_BYTES64 |
1744 			STATION_INFO_TX_BYTES64 |
1745 			STATION_INFO_RX_PACKETS |
1746 			STATION_INFO_TX_PACKETS |
1747 			STATION_INFO_TX_RETRIES |
1748 			STATION_INFO_TX_FAILED |
1749 			STATION_INFO_TX_BITRATE |
1750 			STATION_INFO_RX_BITRATE |
1751 			STATION_INFO_RX_DROP_MISC |
1752 			STATION_INFO_BSS_PARAM |
1753 			STATION_INFO_CONNECTED_TIME |
1754 			STATION_INFO_STA_FLAGS |
1755 			STATION_INFO_BEACON_LOSS_COUNT;
1756 
1757 	ktime_get_ts(&uptime);
1758 	sinfo->connected_time = uptime.tv_sec - sta->last_connected;
1759 
1760 	sinfo->inactive_time = jiffies_to_msecs(jiffies - sta->last_rx);
1761 	sinfo->tx_bytes = 0;
1762 	for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1763 		sinfo->tx_bytes += sta->tx_bytes[ac];
1764 		packets += sta->tx_packets[ac];
1765 	}
1766 	sinfo->tx_packets = packets;
1767 	sinfo->rx_bytes = sta->rx_bytes;
1768 	sinfo->rx_packets = sta->rx_packets;
1769 	sinfo->tx_retries = sta->tx_retry_count;
1770 	sinfo->tx_failed = sta->tx_retry_failed;
1771 	sinfo->rx_dropped_misc = sta->rx_dropped;
1772 	sinfo->beacon_loss_count = sta->beacon_loss_count;
1773 
1774 	if ((sta->local->hw.flags & IEEE80211_HW_SIGNAL_DBM) ||
1775 	    (sta->local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)) {
1776 		sinfo->filled |= STATION_INFO_SIGNAL | STATION_INFO_SIGNAL_AVG;
1777 		if (!local->ops->get_rssi ||
1778 		    drv_get_rssi(local, sdata, &sta->sta, &sinfo->signal))
1779 			sinfo->signal = (s8)sta->last_signal;
1780 		sinfo->signal_avg = (s8) -ewma_read(&sta->avg_signal);
1781 	}
1782 	if (sta->chains) {
1783 		sinfo->filled |= STATION_INFO_CHAIN_SIGNAL |
1784 				 STATION_INFO_CHAIN_SIGNAL_AVG;
1785 
1786 		sinfo->chains = sta->chains;
1787 		for (i = 0; i < ARRAY_SIZE(sinfo->chain_signal); i++) {
1788 			sinfo->chain_signal[i] = sta->chain_signal_last[i];
1789 			sinfo->chain_signal_avg[i] =
1790 				(s8) -ewma_read(&sta->chain_signal_avg[i]);
1791 		}
1792 	}
1793 
1794 	sta_set_rate_info_tx(sta, &sta->last_tx_rate, &sinfo->txrate);
1795 	sta_set_rate_info_rx(sta, &sinfo->rxrate);
1796 
1797 	if (ieee80211_vif_is_mesh(&sdata->vif)) {
1798 #ifdef CONFIG_MAC80211_MESH
1799 		sinfo->filled |= STATION_INFO_LLID |
1800 				 STATION_INFO_PLID |
1801 				 STATION_INFO_PLINK_STATE |
1802 				 STATION_INFO_LOCAL_PM |
1803 				 STATION_INFO_PEER_PM |
1804 				 STATION_INFO_NONPEER_PM;
1805 
1806 		sinfo->llid = sta->llid;
1807 		sinfo->plid = sta->plid;
1808 		sinfo->plink_state = sta->plink_state;
1809 		if (test_sta_flag(sta, WLAN_STA_TOFFSET_KNOWN)) {
1810 			sinfo->filled |= STATION_INFO_T_OFFSET;
1811 			sinfo->t_offset = sta->t_offset;
1812 		}
1813 		sinfo->local_pm = sta->local_pm;
1814 		sinfo->peer_pm = sta->peer_pm;
1815 		sinfo->nonpeer_pm = sta->nonpeer_pm;
1816 #endif
1817 	}
1818 
1819 	sinfo->bss_param.flags = 0;
1820 	if (sdata->vif.bss_conf.use_cts_prot)
1821 		sinfo->bss_param.flags |= BSS_PARAM_FLAGS_CTS_PROT;
1822 	if (sdata->vif.bss_conf.use_short_preamble)
1823 		sinfo->bss_param.flags |= BSS_PARAM_FLAGS_SHORT_PREAMBLE;
1824 	if (sdata->vif.bss_conf.use_short_slot)
1825 		sinfo->bss_param.flags |= BSS_PARAM_FLAGS_SHORT_SLOT_TIME;
1826 	sinfo->bss_param.dtim_period = sdata->vif.bss_conf.dtim_period;
1827 	sinfo->bss_param.beacon_interval = sdata->vif.bss_conf.beacon_int;
1828 
1829 	sinfo->sta_flags.set = 0;
1830 	sinfo->sta_flags.mask = BIT(NL80211_STA_FLAG_AUTHORIZED) |
1831 				BIT(NL80211_STA_FLAG_SHORT_PREAMBLE) |
1832 				BIT(NL80211_STA_FLAG_WME) |
1833 				BIT(NL80211_STA_FLAG_MFP) |
1834 				BIT(NL80211_STA_FLAG_AUTHENTICATED) |
1835 				BIT(NL80211_STA_FLAG_ASSOCIATED) |
1836 				BIT(NL80211_STA_FLAG_TDLS_PEER);
1837 	if (test_sta_flag(sta, WLAN_STA_AUTHORIZED))
1838 		sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_AUTHORIZED);
1839 	if (test_sta_flag(sta, WLAN_STA_SHORT_PREAMBLE))
1840 		sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_SHORT_PREAMBLE);
1841 	if (sta->sta.wme)
1842 		sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_WME);
1843 	if (test_sta_flag(sta, WLAN_STA_MFP))
1844 		sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_MFP);
1845 	if (test_sta_flag(sta, WLAN_STA_AUTH))
1846 		sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_AUTHENTICATED);
1847 	if (test_sta_flag(sta, WLAN_STA_ASSOC))
1848 		sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_ASSOCIATED);
1849 	if (test_sta_flag(sta, WLAN_STA_TDLS_PEER))
1850 		sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_TDLS_PEER);
1851 
1852 	/* check if the driver has a SW RC implementation */
1853 	if (ref && ref->ops->get_expected_throughput)
1854 		thr = ref->ops->get_expected_throughput(sta->rate_ctrl_priv);
1855 	else
1856 		thr = drv_get_expected_throughput(local, &sta->sta);
1857 
1858 	if (thr != 0) {
1859 		sinfo->filled |= STATION_INFO_EXPECTED_THROUGHPUT;
1860 		sinfo->expected_throughput = thr;
1861 	}
1862 }
1863