1/*
   2 * Copyright 2002-2005, Instant802 Networks, Inc.
   3 * Copyright 2006-2007	Jiri Benc <jbenc@suse.cz>
   4 * Copyright 2013-2014  Intel Mobile Communications GmbH
   5 * Copyright (C) 2015 - 2016 Intel Deutschland GmbH
   6 *
   7 * This program is free software; you can redistribute it and/or modify
   8 * it under the terms of the GNU General Public License version 2 as
   9 * published by the Free Software Foundation.
  10 */
  11
  12#include <linux/module.h>
  13#include <linux/init.h>
  14#include <linux/etherdevice.h>
  15#include <linux/netdevice.h>
  16#include <linux/types.h>
  17#include <linux/slab.h>
  18#include <linux/skbuff.h>
  19#include <linux/if_arp.h>
  20#include <linux/timer.h>
  21#include <linux/rtnetlink.h>
  22
 
  23#include <net/mac80211.h>
  24#include "ieee80211_i.h"
  25#include "driver-ops.h"
  26#include "rate.h"
  27#include "sta_info.h"
  28#include "debugfs_sta.h"
  29#include "mesh.h"
  30#include "wme.h"
  31
  32/**
  33 * DOC: STA information lifetime rules
  34 *
  35 * STA info structures (&struct sta_info) are managed in a hash table
  36 * for faster lookup and a list for iteration. They are managed using
  37 * RCU, i.e. access to the list and hash table is protected by RCU.
  38 *
  39 * Upon allocating a STA info structure with sta_info_alloc(), the caller
  40 * owns that structure. It must then insert it into the hash table using
  41 * either sta_info_insert() or sta_info_insert_rcu(); only in the latter
  42 * case (which acquires an rcu read section but must not be called from
  43 * within one) will the pointer still be valid after the call. Note that
  44 * the caller may not do much with the STA info before inserting it, in
  45 * particular, it may not start any mesh peer link management or add
  46 * encryption keys.
  47 *
  48 * When the insertion fails (sta_info_insert()) returns non-zero), the
  49 * structure will have been freed by sta_info_insert()!
  50 *
  51 * Station entries are added by mac80211 when you establish a link with a
  52 * peer. This means different things for the different type of interfaces
  53 * we support. For a regular station this mean we add the AP sta when we
  54 * receive an association response from the AP. For IBSS this occurs when
  55 * get to know about a peer on the same IBSS. For WDS we add the sta for
  56 * the peer immediately upon device open. When using AP mode we add stations
  57 * for each respective station upon request from userspace through nl80211.
  58 *
  59 * In order to remove a STA info structure, various sta_info_destroy_*()
  60 * calls are available.
  61 *
  62 * There is no concept of ownership on a STA entry, each structure is
  63 * owned by the global hash table/list until it is removed. All users of
  64 * the structure need to be RCU protected so that the structure won't be
  65 * freed before they are done using it.
  66 */
  67
  68static const struct rhashtable_params sta_rht_params = {
  69	.nelem_hint = 3, /* start small */
  70	.automatic_shrinking = true,
  71	.head_offset = offsetof(struct sta_info, hash_node),
  72	.key_offset = offsetof(struct sta_info, addr),
  73	.key_len = ETH_ALEN,
  74	.max_size = CONFIG_MAC80211_STA_HASH_MAX_SIZE,
  75};
  76
  77/* Caller must hold local->sta_mtx */
  78static int sta_info_hash_del(struct ieee80211_local *local,
  79			     struct sta_info *sta)
  80{
  81	return rhltable_remove(&local->sta_hash, &sta->hash_node,
  82			       sta_rht_params);
  83}
  84
  85static void __cleanup_single_sta(struct sta_info *sta)
  86{
  87	int ac, i;
  88	struct tid_ampdu_tx *tid_tx;
  89	struct ieee80211_sub_if_data *sdata = sta->sdata;
  90	struct ieee80211_local *local = sdata->local;
  91	struct fq *fq = &local->fq;
  92	struct ps_data *ps;
  93
  94	if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
  95	    test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
  96	    test_sta_flag(sta, WLAN_STA_PS_DELIVER)) {
  97		if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
  98		    sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
  99			ps = &sdata->bss->ps;
 100		else if (ieee80211_vif_is_mesh(&sdata->vif))
 101			ps = &sdata->u.mesh.ps;
 102		else
 103			return;
 104
 105		clear_sta_flag(sta, WLAN_STA_PS_STA);
 106		clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
 107		clear_sta_flag(sta, WLAN_STA_PS_DELIVER);
 108
 109		atomic_dec(&ps->num_sta_ps);
 110	}
 111
 112	if (sta->sta.txq[0]) {
 113		for (i = 0; i < ARRAY_SIZE(sta->sta.txq); i++) {
 114			struct txq_info *txqi = to_txq_info(sta->sta.txq[i]);
 115
 116			spin_lock_bh(&fq->lock);
 117			ieee80211_txq_purge(local, txqi);
 118			spin_unlock_bh(&fq->lock);
 119		}
 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
 149static 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
 158struct rhlist_head *sta_info_hash_lookup(struct ieee80211_local *local,
 159					 const u8 *addr)
 160{
 161	return rhltable_lookup(&local->sta_hash, addr, sta_rht_params);
 162}
 163
 164/* protected by RCU */
 165struct sta_info *sta_info_get(struct ieee80211_sub_if_data *sdata,
 166			      const u8 *addr)
 167{
 168	struct ieee80211_local *local = sdata->local;
 169	struct rhlist_head *tmp;
 170	struct sta_info *sta;
 171
 172	rcu_read_lock();
 173	for_each_sta_info(local, addr, sta, tmp) {
 174		if (sta->sdata == sdata) {
 175			rcu_read_unlock();
 176			/* this is safe as the caller must already hold
 177			 * another rcu read section or the mutex
 178			 */
 179			return sta;
 180		}
 181	}
 182	rcu_read_unlock();
 183	return NULL;
 184}
 185
 186/*
 187 * Get sta info either from the specified interface
 188 * or from one of its vlans
 189 */
 190struct sta_info *sta_info_get_bss(struct ieee80211_sub_if_data *sdata,
 191				  const u8 *addr)
 192{
 193	struct ieee80211_local *local = sdata->local;
 194	struct rhlist_head *tmp;
 195	struct sta_info *sta;
 196
 197	rcu_read_lock();
 198	for_each_sta_info(local, addr, sta, tmp) {
 199		if (sta->sdata == sdata ||
 200		    (sta->sdata->bss && sta->sdata->bss == sdata->bss)) {
 201			rcu_read_unlock();
 202			/* this is safe as the caller must already hold
 203			 * another rcu read section or the mutex
 204			 */
 205			return sta;
 206		}
 207	}
 208	rcu_read_unlock();
 209	return NULL;
 210}
 211
 212struct sta_info *sta_info_get_by_idx(struct ieee80211_sub_if_data *sdata,
 213				     int idx)
 214{
 215	struct ieee80211_local *local = sdata->local;
 216	struct sta_info *sta;
 217	int i = 0;
 218
 219	list_for_each_entry_rcu(sta, &local->sta_list, list) {
 220		if (sdata != sta->sdata)
 221			continue;
 222		if (i < idx) {
 223			++i;
 224			continue;
 225		}
 226		return sta;
 227	}
 228
 229	return NULL;
 230}
 231
 232/**
 233 * sta_info_free - free STA
 234 *
 235 * @local: pointer to the global information
 236 * @sta: STA info to free
 237 *
 238 * This function must undo everything done by sta_info_alloc()
 239 * that may happen before sta_info_insert(). It may only be
 240 * called when sta_info_insert() has not been attempted (and
 241 * if that fails, the station is freed anyway.)
 242 */
 243void sta_info_free(struct ieee80211_local *local, struct sta_info *sta)
 244{
 245	if (sta->rate_ctrl)
 246		rate_control_free_sta(sta);
 247
 248	sta_dbg(sta->sdata, "Destroyed STA %pM\n", sta->sta.addr);
 249
 250	if (sta->sta.txq[0])
 251		kfree(to_txq_info(sta->sta.txq[0]));
 252	kfree(rcu_dereference_raw(sta->sta.rates));
 253#ifdef CONFIG_MAC80211_MESH
 254	kfree(sta->mesh);
 255#endif
 256	free_percpu(sta->pcpu_rx_stats);
 257	kfree(sta);
 258}
 259
 260/* Caller must hold local->sta_mtx */
 261static int sta_info_hash_add(struct ieee80211_local *local,
 262			     struct sta_info *sta)
 263{
 264	return rhltable_insert(&local->sta_hash, &sta->hash_node,
 265			       sta_rht_params);
 266}
 267
 268static void sta_deliver_ps_frames(struct work_struct *wk)
 269{
 270	struct sta_info *sta;
 271
 272	sta = container_of(wk, struct sta_info, drv_deliver_wk);
 273
 274	if (sta->dead)
 275		return;
 276
 277	local_bh_disable();
 278	if (!test_sta_flag(sta, WLAN_STA_PS_STA))
 279		ieee80211_sta_ps_deliver_wakeup(sta);
 280	else if (test_and_clear_sta_flag(sta, WLAN_STA_PSPOLL))
 281		ieee80211_sta_ps_deliver_poll_response(sta);
 282	else if (test_and_clear_sta_flag(sta, WLAN_STA_UAPSD))
 283		ieee80211_sta_ps_deliver_uapsd(sta);
 284	local_bh_enable();
 285}
 286
 287static int sta_prepare_rate_control(struct ieee80211_local *local,
 288				    struct sta_info *sta, gfp_t gfp)
 289{
 290	if (ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL))
 291		return 0;
 292
 293	sta->rate_ctrl = local->rate_ctrl;
 294	sta->rate_ctrl_priv = rate_control_alloc_sta(sta->rate_ctrl,
 295						     sta, gfp);
 296	if (!sta->rate_ctrl_priv)
 297		return -ENOMEM;
 298
 299	return 0;
 300}
 301
 302struct sta_info *sta_info_alloc(struct ieee80211_sub_if_data *sdata,
 303				const u8 *addr, gfp_t gfp)
 304{
 305	struct ieee80211_local *local = sdata->local;
 306	struct ieee80211_hw *hw = &local->hw;
 307	struct sta_info *sta;
 308	int i;
 309
 310	sta = kzalloc(sizeof(*sta) + hw->sta_data_size, gfp);
 311	if (!sta)
 312		return NULL;
 313
 314	if (ieee80211_hw_check(hw, USES_RSS)) {
 315		sta->pcpu_rx_stats =
 316			alloc_percpu(struct ieee80211_sta_rx_stats);
 317		if (!sta->pcpu_rx_stats)
 318			goto free;
 319	}
 320
 321	spin_lock_init(&sta->lock);
 322	spin_lock_init(&sta->ps_lock);
 323	INIT_WORK(&sta->drv_deliver_wk, sta_deliver_ps_frames);
 324	INIT_WORK(&sta->ampdu_mlme.work, ieee80211_ba_session_work);
 325	mutex_init(&sta->ampdu_mlme.mtx);
 326#ifdef CONFIG_MAC80211_MESH
 327	if (ieee80211_vif_is_mesh(&sdata->vif)) {
 328		sta->mesh = kzalloc(sizeof(*sta->mesh), gfp);
 329		if (!sta->mesh)
 330			goto free;
 
 331		spin_lock_init(&sta->mesh->plink_lock);
 332		if (ieee80211_vif_is_mesh(&sdata->vif) &&
 333		    !sdata->u.mesh.user_mpm)
 334			init_timer(&sta->mesh->plink_timer);
 
 335		sta->mesh->nonpeer_pm = NL80211_MESH_POWER_ACTIVE;
 336	}
 337#endif
 338
 339	memcpy(sta->addr, addr, ETH_ALEN);
 340	memcpy(sta->sta.addr, addr, ETH_ALEN);
 341	sta->sta.max_rx_aggregation_subframes =
 342		local->hw.max_rx_aggregation_subframes;
 343
 344	sta->local = local;
 345	sta->sdata = sdata;
 346	sta->rx_stats.last_rx = jiffies;
 347
 348	u64_stats_init(&sta->rx_stats.syncp);
 349
 350	sta->sta_state = IEEE80211_STA_NONE;
 351
 352	/* Mark TID as unreserved */
 353	sta->reserved_tid = IEEE80211_TID_UNRESERVED;
 354
 355	sta->last_connected = ktime_get_seconds();
 356	ewma_signal_init(&sta->rx_stats_avg.signal);
 357	for (i = 0; i < ARRAY_SIZE(sta->rx_stats_avg.chain_signal); i++)
 358		ewma_signal_init(&sta->rx_stats_avg.chain_signal[i]);
 359
 360	if (local->ops->wake_tx_queue) {
 361		void *txq_data;
 362		int size = sizeof(struct txq_info) +
 363			   ALIGN(hw->txq_data_size, sizeof(void *));
 364
 365		txq_data = kcalloc(ARRAY_SIZE(sta->sta.txq), size, gfp);
 366		if (!txq_data)
 367			goto free;
 368
 369		for (i = 0; i < ARRAY_SIZE(sta->sta.txq); i++) {
 370			struct txq_info *txq = txq_data + i * size;
 371
 372			ieee80211_txq_init(sdata, sta, txq, i);
 373		}
 374	}
 375
 376	if (sta_prepare_rate_control(local, sta, gfp))
 377		goto free_txq;
 378
 379	for (i = 0; i < IEEE80211_NUM_TIDS; i++) {
 380		/*
 381		 * timer_to_tid must be initialized with identity mapping
 382		 * to enable session_timer's data differentiation. See
 383		 * sta_rx_agg_session_timer_expired for usage.
 384		 */
 385		sta->timer_to_tid[i] = i;
 386	}
 387	for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 388		skb_queue_head_init(&sta->ps_tx_buf[i]);
 389		skb_queue_head_init(&sta->tx_filtered[i]);
 390	}
 391
 392	for (i = 0; i < IEEE80211_NUM_TIDS; i++)
 393		sta->last_seq_ctrl[i] = cpu_to_le16(USHRT_MAX);
 394
 395	sta->sta.smps_mode = IEEE80211_SMPS_OFF;
 396	if (sdata->vif.type == NL80211_IFTYPE_AP ||
 397	    sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 398		struct ieee80211_supported_band *sband =
 399			hw->wiphy->bands[ieee80211_get_sdata_band(sdata)];
 400		u8 smps = (sband->ht_cap.cap & IEEE80211_HT_CAP_SM_PS) >>
 401				IEEE80211_HT_CAP_SM_PS_SHIFT;
 
 
 
 
 
 402		/*
 403		 * Assume that hostapd advertises our caps in the beacon and
 404		 * this is the known_smps_mode for a station that just assciated
 405		 */
 406		switch (smps) {
 407		case WLAN_HT_SMPS_CONTROL_DISABLED:
 408			sta->known_smps_mode = IEEE80211_SMPS_OFF;
 409			break;
 410		case WLAN_HT_SMPS_CONTROL_STATIC:
 411			sta->known_smps_mode = IEEE80211_SMPS_STATIC;
 412			break;
 413		case WLAN_HT_SMPS_CONTROL_DYNAMIC:
 414			sta->known_smps_mode = IEEE80211_SMPS_DYNAMIC;
 415			break;
 416		default:
 417			WARN_ON(1);
 418		}
 419	}
 420
 421	sta->sta.max_rc_amsdu_len = IEEE80211_MAX_MPDU_LEN_HT_BA;
 422
 
 
 
 
 
 423	sta_dbg(sdata, "Allocated STA %pM\n", sta->sta.addr);
 424
 425	return sta;
 426
 427free_txq:
 428	if (sta->sta.txq[0])
 429		kfree(to_txq_info(sta->sta.txq[0]));
 430free:
 
 431#ifdef CONFIG_MAC80211_MESH
 432	kfree(sta->mesh);
 433#endif
 434	kfree(sta);
 435	return NULL;
 436}
 437
 438static int sta_info_insert_check(struct sta_info *sta)
 439{
 440	struct ieee80211_sub_if_data *sdata = sta->sdata;
 441
 442	/*
 443	 * Can't be a WARN_ON because it can be triggered through a race:
 444	 * something inserts a STA (on one CPU) without holding the RTNL
 445	 * and another CPU turns off the net device.
 446	 */
 447	if (unlikely(!ieee80211_sdata_running(sdata)))
 448		return -ENETDOWN;
 449
 450	if (WARN_ON(ether_addr_equal(sta->sta.addr, sdata->vif.addr) ||
 451		    is_multicast_ether_addr(sta->sta.addr)))
 452		return -EINVAL;
 453
 454	/* The RCU read lock is required by rhashtable due to
 455	 * asynchronous resize/rehash.  We also require the mutex
 456	 * for correctness.
 457	 */
 458	rcu_read_lock();
 459	lockdep_assert_held(&sdata->local->sta_mtx);
 460	if (ieee80211_hw_check(&sdata->local->hw, NEEDS_UNIQUE_STA_ADDR) &&
 461	    ieee80211_find_sta_by_ifaddr(&sdata->local->hw, sta->addr, NULL)) {
 462		rcu_read_unlock();
 463		return -ENOTUNIQ;
 464	}
 465	rcu_read_unlock();
 466
 467	return 0;
 468}
 469
 470static int sta_info_insert_drv_state(struct ieee80211_local *local,
 471				     struct ieee80211_sub_if_data *sdata,
 472				     struct sta_info *sta)
 473{
 474	enum ieee80211_sta_state state;
 475	int err = 0;
 476
 477	for (state = IEEE80211_STA_NOTEXIST; state < sta->sta_state; state++) {
 478		err = drv_sta_state(local, sdata, sta, state, state + 1);
 479		if (err)
 480			break;
 481	}
 482
 483	if (!err) {
 484		/*
 485		 * Drivers using legacy sta_add/sta_remove callbacks only
 486		 * get uploaded set to true after sta_add is called.
 487		 */
 488		if (!local->ops->sta_add)
 489			sta->uploaded = true;
 490		return 0;
 491	}
 492
 493	if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 494		sdata_info(sdata,
 495			   "failed to move IBSS STA %pM to state %d (%d) - keeping it anyway\n",
 496			   sta->sta.addr, state + 1, err);
 497		err = 0;
 498	}
 499
 500	/* unwind on error */
 501	for (; state > IEEE80211_STA_NOTEXIST; state--)
 502		WARN_ON(drv_sta_state(local, sdata, sta, state, state - 1));
 503
 504	return err;
 505}
 506
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 507/*
 508 * should be called with sta_mtx locked
 509 * this function replaces the mutex lock
 510 * with a RCU lock
 511 */
 512static int sta_info_insert_finish(struct sta_info *sta) __acquires(RCU)
 513{
 514	struct ieee80211_local *local = sta->local;
 515	struct ieee80211_sub_if_data *sdata = sta->sdata;
 516	struct station_info *sinfo;
 517	int err = 0;
 518
 519	lockdep_assert_held(&local->sta_mtx);
 520
 521	sinfo = kzalloc(sizeof(struct station_info), GFP_KERNEL);
 522	if (!sinfo) {
 523		err = -ENOMEM;
 524		goto out_err;
 525	}
 526
 527	/* check if STA exists already */
 528	if (sta_info_get_bss(sdata, sta->sta.addr)) {
 529		err = -EEXIST;
 530		goto out_err;
 531	}
 532
 
 
 
 
 
 
 533	local->num_sta++;
 534	local->sta_generation++;
 535	smp_mb();
 536
 537	/* simplify things and don't accept BA sessions yet */
 538	set_sta_flag(sta, WLAN_STA_BLOCK_BA);
 539
 540	/* make the station visible */
 541	err = sta_info_hash_add(local, sta);
 542	if (err)
 543		goto out_drop_sta;
 544
 545	list_add_tail_rcu(&sta->list, &local->sta_list);
 546
 547	/* notify driver */
 548	err = sta_info_insert_drv_state(local, sdata, sta);
 549	if (err)
 550		goto out_remove;
 551
 552	set_sta_flag(sta, WLAN_STA_INSERTED);
 
 
 
 
 
 
 
 553	/* accept BA sessions now */
 554	clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
 555
 556	ieee80211_sta_debugfs_add(sta);
 557	rate_control_add_sta_debugfs(sta);
 558
 559	sinfo->generation = local->sta_generation;
 560	cfg80211_new_sta(sdata->dev, sta->sta.addr, sinfo, GFP_KERNEL);
 561	kfree(sinfo);
 562
 563	sta_dbg(sdata, "Inserted STA %pM\n", sta->sta.addr);
 564
 565	/* move reference to rcu-protected */
 566	rcu_read_lock();
 567	mutex_unlock(&local->sta_mtx);
 568
 569	if (ieee80211_vif_is_mesh(&sdata->vif))
 570		mesh_accept_plinks_update(sdata);
 571
 572	return 0;
 573 out_remove:
 574	sta_info_hash_del(local, sta);
 575	list_del_rcu(&sta->list);
 576 out_drop_sta:
 577	local->num_sta--;
 578	synchronize_net();
 579	__cleanup_single_sta(sta);
 580 out_err:
 581	mutex_unlock(&local->sta_mtx);
 582	kfree(sinfo);
 583	rcu_read_lock();
 584	return err;
 585}
 586
 587int sta_info_insert_rcu(struct sta_info *sta) __acquires(RCU)
 588{
 589	struct ieee80211_local *local = sta->local;
 590	int err;
 591
 592	might_sleep();
 593
 594	mutex_lock(&local->sta_mtx);
 595
 596	err = sta_info_insert_check(sta);
 597	if (err) {
 598		mutex_unlock(&local->sta_mtx);
 599		rcu_read_lock();
 600		goto out_free;
 601	}
 602
 603	err = sta_info_insert_finish(sta);
 604	if (err)
 605		goto out_free;
 606
 607	return 0;
 608 out_free:
 609	sta_info_free(local, sta);
 610	return err;
 611}
 612
 613int sta_info_insert(struct sta_info *sta)
 614{
 615	int err = sta_info_insert_rcu(sta);
 616
 617	rcu_read_unlock();
 618
 619	return err;
 620}
 621
 622static inline void __bss_tim_set(u8 *tim, u16 id)
 623{
 624	/*
 625	 * This format has been mandated by the IEEE specifications,
 626	 * so this line may not be changed to use the __set_bit() format.
 627	 */
 628	tim[id / 8] |= (1 << (id % 8));
 629}
 630
 631static inline void __bss_tim_clear(u8 *tim, u16 id)
 632{
 633	/*
 634	 * This format has been mandated by the IEEE specifications,
 635	 * so this line may not be changed to use the __clear_bit() format.
 636	 */
 637	tim[id / 8] &= ~(1 << (id % 8));
 638}
 639
 640static inline bool __bss_tim_get(u8 *tim, u16 id)
 641{
 642	/*
 643	 * This format has been mandated by the IEEE specifications,
 644	 * so this line may not be changed to use the test_bit() format.
 645	 */
 646	return tim[id / 8] & (1 << (id % 8));
 647}
 648
 649static unsigned long ieee80211_tids_for_ac(int ac)
 650{
 651	/* If we ever support TIDs > 7, this obviously needs to be adjusted */
 652	switch (ac) {
 653	case IEEE80211_AC_VO:
 654		return BIT(6) | BIT(7);
 655	case IEEE80211_AC_VI:
 656		return BIT(4) | BIT(5);
 657	case IEEE80211_AC_BE:
 658		return BIT(0) | BIT(3);
 659	case IEEE80211_AC_BK:
 660		return BIT(1) | BIT(2);
 661	default:
 662		WARN_ON(1);
 663		return 0;
 664	}
 665}
 666
 667static void __sta_info_recalc_tim(struct sta_info *sta, bool ignore_pending)
 668{
 669	struct ieee80211_local *local = sta->local;
 670	struct ps_data *ps;
 671	bool indicate_tim = false;
 672	u8 ignore_for_tim = sta->sta.uapsd_queues;
 673	int ac;
 674	u16 id = sta->sta.aid;
 675
 676	if (sta->sdata->vif.type == NL80211_IFTYPE_AP ||
 677	    sta->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 678		if (WARN_ON_ONCE(!sta->sdata->bss))
 679			return;
 680
 681		ps = &sta->sdata->bss->ps;
 682#ifdef CONFIG_MAC80211_MESH
 683	} else if (ieee80211_vif_is_mesh(&sta->sdata->vif)) {
 684		ps = &sta->sdata->u.mesh.ps;
 685#endif
 686	} else {
 687		return;
 688	}
 689
 690	/* No need to do anything if the driver does all */
 691	if (ieee80211_hw_check(&local->hw, AP_LINK_PS))
 692		return;
 693
 694	if (sta->dead)
 695		goto done;
 696
 697	/*
 698	 * If all ACs are delivery-enabled then we should build
 699	 * the TIM bit for all ACs anyway; if only some are then
 700	 * we ignore those and build the TIM bit using only the
 701	 * non-enabled ones.
 702	 */
 703	if (ignore_for_tim == BIT(IEEE80211_NUM_ACS) - 1)
 704		ignore_for_tim = 0;
 705
 706	if (ignore_pending)
 707		ignore_for_tim = BIT(IEEE80211_NUM_ACS) - 1;
 708
 709	for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
 710		unsigned long tids;
 711
 712		if (ignore_for_tim & ieee80211_ac_to_qos_mask[ac])
 713			continue;
 714
 715		indicate_tim |= !skb_queue_empty(&sta->tx_filtered[ac]) ||
 716				!skb_queue_empty(&sta->ps_tx_buf[ac]);
 717		if (indicate_tim)
 718			break;
 719
 720		tids = ieee80211_tids_for_ac(ac);
 721
 722		indicate_tim |=
 723			sta->driver_buffered_tids & tids;
 724		indicate_tim |=
 725			sta->txq_buffered_tids & tids;
 726	}
 727
 728 done:
 729	spin_lock_bh(&local->tim_lock);
 730
 731	if (indicate_tim == __bss_tim_get(ps->tim, id))
 732		goto out_unlock;
 733
 734	if (indicate_tim)
 735		__bss_tim_set(ps->tim, id);
 736	else
 737		__bss_tim_clear(ps->tim, id);
 738
 739	if (local->ops->set_tim && !WARN_ON(sta->dead)) {
 740		local->tim_in_locked_section = true;
 741		drv_set_tim(local, &sta->sta, indicate_tim);
 742		local->tim_in_locked_section = false;
 743	}
 744
 745out_unlock:
 746	spin_unlock_bh(&local->tim_lock);
 747}
 748
 749void sta_info_recalc_tim(struct sta_info *sta)
 750{
 751	__sta_info_recalc_tim(sta, false);
 752}
 753
 754static bool sta_info_buffer_expired(struct sta_info *sta, struct sk_buff *skb)
 755{
 756	struct ieee80211_tx_info *info;
 757	int timeout;
 758
 759	if (!skb)
 760		return false;
 761
 762	info = IEEE80211_SKB_CB(skb);
 763
 764	/* Timeout: (2 * listen_interval * beacon_int * 1024 / 1000000) sec */
 765	timeout = (sta->listen_interval *
 766		   sta->sdata->vif.bss_conf.beacon_int *
 767		   32 / 15625) * HZ;
 768	if (timeout < STA_TX_BUFFER_EXPIRE)
 769		timeout = STA_TX_BUFFER_EXPIRE;
 770	return time_after(jiffies, info->control.jiffies + timeout);
 771}
 772
 773
 774static bool sta_info_cleanup_expire_buffered_ac(struct ieee80211_local *local,
 775						struct sta_info *sta, int ac)
 776{
 777	unsigned long flags;
 778	struct sk_buff *skb;
 779
 780	/*
 781	 * First check for frames that should expire on the filtered
 782	 * queue. Frames here were rejected by the driver and are on
 783	 * a separate queue to avoid reordering with normal PS-buffered
 784	 * frames. They also aren't accounted for right now in the
 785	 * total_ps_buffered counter.
 786	 */
 787	for (;;) {
 788		spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
 789		skb = skb_peek(&sta->tx_filtered[ac]);
 790		if (sta_info_buffer_expired(sta, skb))
 791			skb = __skb_dequeue(&sta->tx_filtered[ac]);
 792		else
 793			skb = NULL;
 794		spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
 795
 796		/*
 797		 * Frames are queued in order, so if this one
 798		 * hasn't expired yet we can stop testing. If
 799		 * we actually reached the end of the queue we
 800		 * also need to stop, of course.
 801		 */
 802		if (!skb)
 803			break;
 804		ieee80211_free_txskb(&local->hw, skb);
 805	}
 806
 807	/*
 808	 * Now also check the normal PS-buffered queue, this will
 809	 * only find something if the filtered queue was emptied
 810	 * since the filtered frames are all before the normal PS
 811	 * buffered frames.
 812	 */
 813	for (;;) {
 814		spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
 815		skb = skb_peek(&sta->ps_tx_buf[ac]);
 816		if (sta_info_buffer_expired(sta, skb))
 817			skb = __skb_dequeue(&sta->ps_tx_buf[ac]);
 818		else
 819			skb = NULL;
 820		spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
 821
 822		/*
 823		 * frames are queued in order, so if this one
 824		 * hasn't expired yet (or we reached the end of
 825		 * the queue) we can stop testing
 826		 */
 827		if (!skb)
 828			break;
 829
 830		local->total_ps_buffered--;
 831		ps_dbg(sta->sdata, "Buffered frame expired (STA %pM)\n",
 832		       sta->sta.addr);
 833		ieee80211_free_txskb(&local->hw, skb);
 834	}
 835
 836	/*
 837	 * Finally, recalculate the TIM bit for this station -- it might
 838	 * now be clear because the station was too slow to retrieve its
 839	 * frames.
 840	 */
 841	sta_info_recalc_tim(sta);
 842
 843	/*
 844	 * Return whether there are any frames still buffered, this is
 845	 * used to check whether the cleanup timer still needs to run,
 846	 * if there are no frames we don't need to rearm the timer.
 847	 */
 848	return !(skb_queue_empty(&sta->ps_tx_buf[ac]) &&
 849		 skb_queue_empty(&sta->tx_filtered[ac]));
 850}
 851
 852static bool sta_info_cleanup_expire_buffered(struct ieee80211_local *local,
 853					     struct sta_info *sta)
 854{
 855	bool have_buffered = false;
 856	int ac;
 857
 858	/* This is only necessary for stations on BSS/MBSS interfaces */
 859	if (!sta->sdata->bss &&
 860	    !ieee80211_vif_is_mesh(&sta->sdata->vif))
 861		return false;
 862
 863	for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
 864		have_buffered |=
 865			sta_info_cleanup_expire_buffered_ac(local, sta, ac);
 866
 867	return have_buffered;
 868}
 869
 870static int __must_check __sta_info_destroy_part1(struct sta_info *sta)
 871{
 872	struct ieee80211_local *local;
 873	struct ieee80211_sub_if_data *sdata;
 874	int ret;
 875
 876	might_sleep();
 877
 878	if (!sta)
 879		return -ENOENT;
 880
 881	local = sta->local;
 882	sdata = sta->sdata;
 883
 884	lockdep_assert_held(&local->sta_mtx);
 885
 886	/*
 887	 * Before removing the station from the driver and
 888	 * rate control, it might still start new aggregation
 889	 * sessions -- block that to make sure the tear-down
 890	 * will be sufficient.
 891	 */
 892	set_sta_flag(sta, WLAN_STA_BLOCK_BA);
 893	ieee80211_sta_tear_down_BA_sessions(sta, AGG_STOP_DESTROY_STA);
 894
 895	/*
 896	 * Before removing the station from the driver there might be pending
 897	 * rx frames on RSS queues sent prior to the disassociation - wait for
 898	 * all such frames to be processed.
 899	 */
 900	drv_sync_rx_queues(local, sta);
 901
 902	ret = sta_info_hash_del(local, sta);
 903	if (WARN_ON(ret))
 904		return ret;
 905
 906	/*
 907	 * for TDLS peers, make sure to return to the base channel before
 908	 * removal.
 909	 */
 910	if (test_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL)) {
 911		drv_tdls_cancel_channel_switch(local, sdata, &sta->sta);
 912		clear_sta_flag(sta, WLAN_STA_TDLS_OFF_CHANNEL);
 913	}
 914
 915	list_del_rcu(&sta->list);
 916	sta->removed = true;
 917
 918	drv_sta_pre_rcu_remove(local, sta->sdata, sta);
 919
 920	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
 921	    rcu_access_pointer(sdata->u.vlan.sta) == sta)
 922		RCU_INIT_POINTER(sdata->u.vlan.sta, NULL);
 923
 924	return 0;
 925}
 926
 927static void __sta_info_destroy_part2(struct sta_info *sta)
 928{
 929	struct ieee80211_local *local = sta->local;
 930	struct ieee80211_sub_if_data *sdata = sta->sdata;
 931	struct station_info *sinfo;
 932	int ret;
 933
 934	/*
 935	 * NOTE: This assumes at least synchronize_net() was done
 936	 *	 after _part1 and before _part2!
 937	 */
 938
 939	might_sleep();
 940	lockdep_assert_held(&local->sta_mtx);
 941
 942	/* now keys can no longer be reached */
 943	ieee80211_free_sta_keys(local, sta);
 944
 945	/* disable TIM bit - last chance to tell driver */
 946	__sta_info_recalc_tim(sta, true);
 947
 948	sta->dead = true;
 949
 950	local->num_sta--;
 951	local->sta_generation++;
 952
 953	while (sta->sta_state > IEEE80211_STA_NONE) {
 954		ret = sta_info_move_state(sta, sta->sta_state - 1);
 955		if (ret) {
 956			WARN_ON_ONCE(1);
 957			break;
 958		}
 959	}
 960
 961	if (sta->uploaded) {
 962		ret = drv_sta_state(local, sdata, sta, IEEE80211_STA_NONE,
 963				    IEEE80211_STA_NOTEXIST);
 964		WARN_ON_ONCE(ret != 0);
 965	}
 966
 967	sta_dbg(sdata, "Removed STA %pM\n", sta->sta.addr);
 968
 969	sinfo = kzalloc(sizeof(*sinfo), GFP_KERNEL);
 970	if (sinfo)
 971		sta_set_sinfo(sta, sinfo);
 972	cfg80211_del_sta_sinfo(sdata->dev, sta->sta.addr, sinfo, GFP_KERNEL);
 973	kfree(sinfo);
 974
 975	rate_control_remove_sta_debugfs(sta);
 976	ieee80211_sta_debugfs_remove(sta);
 977
 978	cleanup_single_sta(sta);
 979}
 980
 981int __must_check __sta_info_destroy(struct sta_info *sta)
 982{
 983	int err = __sta_info_destroy_part1(sta);
 984
 985	if (err)
 986		return err;
 987
 988	synchronize_net();
 989
 990	__sta_info_destroy_part2(sta);
 991
 992	return 0;
 993}
 994
 995int sta_info_destroy_addr(struct ieee80211_sub_if_data *sdata, const u8 *addr)
 996{
 997	struct sta_info *sta;
 998	int ret;
 999
1000	mutex_lock(&sdata->local->sta_mtx);
1001	sta = sta_info_get(sdata, addr);
1002	ret = __sta_info_destroy(sta);
1003	mutex_unlock(&sdata->local->sta_mtx);
1004
1005	return ret;
1006}
1007
1008int sta_info_destroy_addr_bss(struct ieee80211_sub_if_data *sdata,
1009			      const u8 *addr)
1010{
1011	struct sta_info *sta;
1012	int ret;
1013
1014	mutex_lock(&sdata->local->sta_mtx);
1015	sta = sta_info_get_bss(sdata, addr);
1016	ret = __sta_info_destroy(sta);
1017	mutex_unlock(&sdata->local->sta_mtx);
1018
1019	return ret;
1020}
1021
1022static void sta_info_cleanup(unsigned long data)
1023{
1024	struct ieee80211_local *local = (struct ieee80211_local *) data;
1025	struct sta_info *sta;
1026	bool timer_needed = false;
1027
1028	rcu_read_lock();
1029	list_for_each_entry_rcu(sta, &local->sta_list, list)
1030		if (sta_info_cleanup_expire_buffered(local, sta))
1031			timer_needed = true;
1032	rcu_read_unlock();
1033
1034	if (local->quiescing)
1035		return;
1036
1037	if (!timer_needed)
1038		return;
1039
1040	mod_timer(&local->sta_cleanup,
1041		  round_jiffies(jiffies + STA_INFO_CLEANUP_INTERVAL));
1042}
1043
1044int sta_info_init(struct ieee80211_local *local)
1045{
1046	int err;
1047
1048	err = rhltable_init(&local->sta_hash, &sta_rht_params);
1049	if (err)
1050		return err;
1051
1052	spin_lock_init(&local->tim_lock);
1053	mutex_init(&local->sta_mtx);
1054	INIT_LIST_HEAD(&local->sta_list);
1055
1056	setup_timer(&local->sta_cleanup, sta_info_cleanup,
1057		    (unsigned long)local);
1058	return 0;
1059}
1060
1061void sta_info_stop(struct ieee80211_local *local)
1062{
1063	del_timer_sync(&local->sta_cleanup);
1064	rhltable_destroy(&local->sta_hash);
1065}
1066
1067
1068int __sta_info_flush(struct ieee80211_sub_if_data *sdata, bool vlans)
1069{
1070	struct ieee80211_local *local = sdata->local;
1071	struct sta_info *sta, *tmp;
1072	LIST_HEAD(free_list);
1073	int ret = 0;
1074
1075	might_sleep();
1076
1077	WARN_ON(vlans && sdata->vif.type != NL80211_IFTYPE_AP);
1078	WARN_ON(vlans && !sdata->bss);
1079
1080	mutex_lock(&local->sta_mtx);
1081	list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1082		if (sdata == sta->sdata ||
1083		    (vlans && sdata->bss == sta->sdata->bss)) {
1084			if (!WARN_ON(__sta_info_destroy_part1(sta)))
1085				list_add(&sta->free_list, &free_list);
1086			ret++;
1087		}
1088	}
1089
1090	if (!list_empty(&free_list)) {
1091		synchronize_net();
1092		list_for_each_entry_safe(sta, tmp, &free_list, free_list)
1093			__sta_info_destroy_part2(sta);
1094	}
1095	mutex_unlock(&local->sta_mtx);
1096
1097	return ret;
1098}
1099
1100void ieee80211_sta_expire(struct ieee80211_sub_if_data *sdata,
1101			  unsigned long exp_time)
1102{
1103	struct ieee80211_local *local = sdata->local;
1104	struct sta_info *sta, *tmp;
1105
1106	mutex_lock(&local->sta_mtx);
1107
1108	list_for_each_entry_safe(sta, tmp, &local->sta_list, list) {
1109		unsigned long last_active = ieee80211_sta_last_active(sta);
1110
1111		if (sdata != sta->sdata)
1112			continue;
1113
1114		if (time_is_before_jiffies(last_active + exp_time)) {
1115			sta_dbg(sta->sdata, "expiring inactive STA %pM\n",
1116				sta->sta.addr);
1117
1118			if (ieee80211_vif_is_mesh(&sdata->vif) &&
1119			    test_sta_flag(sta, WLAN_STA_PS_STA))
1120				atomic_dec(&sdata->u.mesh.ps.num_sta_ps);
1121
1122			WARN_ON(__sta_info_destroy(sta));
1123		}
1124	}
1125
1126	mutex_unlock(&local->sta_mtx);
1127}
1128
1129struct ieee80211_sta *ieee80211_find_sta_by_ifaddr(struct ieee80211_hw *hw,
1130						   const u8 *addr,
1131						   const u8 *localaddr)
1132{
1133	struct ieee80211_local *local = hw_to_local(hw);
1134	struct rhlist_head *tmp;
1135	struct sta_info *sta;
1136
1137	/*
1138	 * Just return a random station if localaddr is NULL
1139	 * ... first in list.
1140	 */
1141	for_each_sta_info(local, addr, sta, tmp) {
1142		if (localaddr &&
1143		    !ether_addr_equal(sta->sdata->vif.addr, localaddr))
1144			continue;
1145		if (!sta->uploaded)
1146			return NULL;
1147		return &sta->sta;
1148	}
1149
1150	return NULL;
1151}
1152EXPORT_SYMBOL_GPL(ieee80211_find_sta_by_ifaddr);
1153
1154struct ieee80211_sta *ieee80211_find_sta(struct ieee80211_vif *vif,
1155					 const u8 *addr)
1156{
1157	struct sta_info *sta;
1158
1159	if (!vif)
1160		return NULL;
1161
1162	sta = sta_info_get_bss(vif_to_sdata(vif), addr);
1163	if (!sta)
1164		return NULL;
1165
1166	if (!sta->uploaded)
1167		return NULL;
1168
1169	return &sta->sta;
1170}
1171EXPORT_SYMBOL(ieee80211_find_sta);
1172
1173/* powersave support code */
1174void ieee80211_sta_ps_deliver_wakeup(struct sta_info *sta)
1175{
1176	struct ieee80211_sub_if_data *sdata = sta->sdata;
1177	struct ieee80211_local *local = sdata->local;
1178	struct sk_buff_head pending;
1179	int filtered = 0, buffered = 0, ac, i;
1180	unsigned long flags;
1181	struct ps_data *ps;
1182
1183	if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1184		sdata = container_of(sdata->bss, struct ieee80211_sub_if_data,
1185				     u.ap);
1186
1187	if (sdata->vif.type == NL80211_IFTYPE_AP)
1188		ps = &sdata->bss->ps;
1189	else if (ieee80211_vif_is_mesh(&sdata->vif))
1190		ps = &sdata->u.mesh.ps;
1191	else
1192		return;
1193
1194	clear_sta_flag(sta, WLAN_STA_SP);
1195
1196	BUILD_BUG_ON(BITS_TO_LONGS(IEEE80211_NUM_TIDS) > 1);
1197	sta->driver_buffered_tids = 0;
1198	sta->txq_buffered_tids = 0;
1199
1200	if (!ieee80211_hw_check(&local->hw, AP_LINK_PS))
1201		drv_sta_notify(local, sdata, STA_NOTIFY_AWAKE, &sta->sta);
1202
1203	if (sta->sta.txq[0]) {
1204		for (i = 0; i < ARRAY_SIZE(sta->sta.txq); i++) {
1205			if (!txq_has_queue(sta->sta.txq[i]))
1206				continue;
1207
1208			drv_wake_tx_queue(local, to_txq_info(sta->sta.txq[i]));
1209		}
1210	}
1211
1212	skb_queue_head_init(&pending);
1213
1214	/* sync with ieee80211_tx_h_unicast_ps_buf */
1215	spin_lock(&sta->ps_lock);
1216	/* Send all buffered frames to the station */
1217	for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1218		int count = skb_queue_len(&pending), tmp;
1219
1220		spin_lock_irqsave(&sta->tx_filtered[ac].lock, flags);
1221		skb_queue_splice_tail_init(&sta->tx_filtered[ac], &pending);
1222		spin_unlock_irqrestore(&sta->tx_filtered[ac].lock, flags);
1223		tmp = skb_queue_len(&pending);
1224		filtered += tmp - count;
1225		count = tmp;
1226
1227		spin_lock_irqsave(&sta->ps_tx_buf[ac].lock, flags);
1228		skb_queue_splice_tail_init(&sta->ps_tx_buf[ac], &pending);
1229		spin_unlock_irqrestore(&sta->ps_tx_buf[ac].lock, flags);
1230		tmp = skb_queue_len(&pending);
1231		buffered += tmp - count;
1232	}
1233
1234	ieee80211_add_pending_skbs(local, &pending);
1235
1236	/* now we're no longer in the deliver code */
1237	clear_sta_flag(sta, WLAN_STA_PS_DELIVER);
1238
1239	/* The station might have polled and then woken up before we responded,
1240	 * so clear these flags now to avoid them sticking around.
1241	 */
1242	clear_sta_flag(sta, WLAN_STA_PSPOLL);
1243	clear_sta_flag(sta, WLAN_STA_UAPSD);
1244	spin_unlock(&sta->ps_lock);
1245
1246	atomic_dec(&ps->num_sta_ps);
1247
1248	/* This station just woke up and isn't aware of our SMPS state */
1249	if (!ieee80211_vif_is_mesh(&sdata->vif) &&
1250	    !ieee80211_smps_is_restrictive(sta->known_smps_mode,
1251					   sdata->smps_mode) &&
1252	    sta->known_smps_mode != sdata->bss->req_smps &&
1253	    sta_info_tx_streams(sta) != 1) {
1254		ht_dbg(sdata,
1255		       "%pM just woke up and MIMO capable - update SMPS\n",
1256		       sta->sta.addr);
1257		ieee80211_send_smps_action(sdata, sdata->bss->req_smps,
1258					   sta->sta.addr,
1259					   sdata->vif.bss_conf.bssid);
1260	}
1261
1262	local->total_ps_buffered -= buffered;
1263
1264	sta_info_recalc_tim(sta);
1265
1266	ps_dbg(sdata,
1267	       "STA %pM aid %d sending %d filtered/%d PS frames since STA not sleeping anymore\n",
1268	       sta->sta.addr, sta->sta.aid, filtered, buffered);
1269
1270	ieee80211_check_fast_xmit(sta);
1271}
1272
1273static void ieee80211_send_null_response(struct sta_info *sta, int tid,
1274					 enum ieee80211_frame_release_type reason,
1275					 bool call_driver, bool more_data)
1276{
1277	struct ieee80211_sub_if_data *sdata = sta->sdata;
1278	struct ieee80211_local *local = sdata->local;
1279	struct ieee80211_qos_hdr *nullfunc;
1280	struct sk_buff *skb;
1281	int size = sizeof(*nullfunc);
1282	__le16 fc;
1283	bool qos = sta->sta.wme;
1284	struct ieee80211_tx_info *info;
1285	struct ieee80211_chanctx_conf *chanctx_conf;
1286
1287	if (qos) {
1288		fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1289				 IEEE80211_STYPE_QOS_NULLFUNC |
1290				 IEEE80211_FCTL_FROMDS);
1291	} else {
1292		size -= 2;
1293		fc = cpu_to_le16(IEEE80211_FTYPE_DATA |
1294				 IEEE80211_STYPE_NULLFUNC |
1295				 IEEE80211_FCTL_FROMDS);
1296	}
1297
1298	skb = dev_alloc_skb(local->hw.extra_tx_headroom + size);
1299	if (!skb)
1300		return;
1301
1302	skb_reserve(skb, local->hw.extra_tx_headroom);
1303
1304	nullfunc = (void *) skb_put(skb, size);
1305	nullfunc->frame_control = fc;
1306	nullfunc->duration_id = 0;
1307	memcpy(nullfunc->addr1, sta->sta.addr, ETH_ALEN);
1308	memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
1309	memcpy(nullfunc->addr3, sdata->vif.addr, ETH_ALEN);
1310	nullfunc->seq_ctrl = 0;
1311
1312	skb->priority = tid;
1313	skb_set_queue_mapping(skb, ieee802_1d_to_ac[tid]);
1314	if (qos) {
1315		nullfunc->qos_ctrl = cpu_to_le16(tid);
1316
1317		if (reason == IEEE80211_FRAME_RELEASE_UAPSD) {
1318			nullfunc->qos_ctrl |=
1319				cpu_to_le16(IEEE80211_QOS_CTL_EOSP);
1320			if (more_data)
1321				nullfunc->frame_control |=
1322					cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1323		}
1324	}
1325
1326	info = IEEE80211_SKB_CB(skb);
1327
1328	/*
1329	 * Tell TX path to send this frame even though the
1330	 * STA may still remain is PS mode after this frame
1331	 * exchange. Also set EOSP to indicate this packet
1332	 * ends the poll/service period.
1333	 */
1334	info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER |
1335		       IEEE80211_TX_STATUS_EOSP |
1336		       IEEE80211_TX_CTL_REQ_TX_STATUS;
1337
1338	info->control.flags |= IEEE80211_TX_CTRL_PS_RESPONSE;
1339
1340	if (call_driver)
1341		drv_allow_buffered_frames(local, sta, BIT(tid), 1,
1342					  reason, false);
1343
1344	skb->dev = sdata->dev;
1345
1346	rcu_read_lock();
1347	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
1348	if (WARN_ON(!chanctx_conf)) {
1349		rcu_read_unlock();
1350		kfree_skb(skb);
1351		return;
1352	}
1353
1354	info->band = chanctx_conf->def.chan->band;
1355	ieee80211_xmit(sdata, sta, skb);
1356	rcu_read_unlock();
1357}
1358
1359static int find_highest_prio_tid(unsigned long tids)
1360{
1361	/* lower 3 TIDs aren't ordered perfectly */
1362	if (tids & 0xF8)
1363		return fls(tids) - 1;
1364	/* TID 0 is BE just like TID 3 */
1365	if (tids & BIT(0))
1366		return 0;
1367	return fls(tids) - 1;
1368}
1369
1370/* Indicates if the MORE_DATA bit should be set in the last
1371 * frame obtained by ieee80211_sta_ps_get_frames.
1372 * Note that driver_release_tids is relevant only if
1373 * reason = IEEE80211_FRAME_RELEASE_PSPOLL
1374 */
1375static bool
1376ieee80211_sta_ps_more_data(struct sta_info *sta, u8 ignored_acs,
1377			   enum ieee80211_frame_release_type reason,
1378			   unsigned long driver_release_tids)
1379{
1380	int ac;
1381
1382	/* If the driver has data on more than one TID then
1383	 * certainly there's more data if we release just a
1384	 * single frame now (from a single TID). This will
1385	 * only happen for PS-Poll.
1386	 */
1387	if (reason == IEEE80211_FRAME_RELEASE_PSPOLL &&
1388	    hweight16(driver_release_tids) > 1)
1389		return true;
1390
1391	for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1392		if (ignored_acs & ieee80211_ac_to_qos_mask[ac])
1393			continue;
1394
1395		if (!skb_queue_empty(&sta->tx_filtered[ac]) ||
1396		    !skb_queue_empty(&sta->ps_tx_buf[ac]))
1397			return true;
1398	}
1399
1400	return false;
1401}
1402
1403static void
1404ieee80211_sta_ps_get_frames(struct sta_info *sta, int n_frames, u8 ignored_acs,
1405			    enum ieee80211_frame_release_type reason,
1406			    struct sk_buff_head *frames,
1407			    unsigned long *driver_release_tids)
1408{
1409	struct ieee80211_sub_if_data *sdata = sta->sdata;
1410	struct ieee80211_local *local = sdata->local;
1411	int ac;
1412
1413	/* Get response frame(s) and more data bit for the last one. */
1414	for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1415		unsigned long tids;
1416
1417		if (ignored_acs & ieee80211_ac_to_qos_mask[ac])
1418			continue;
1419
1420		tids = ieee80211_tids_for_ac(ac);
1421
1422		/* if we already have frames from software, then we can't also
1423		 * release from hardware queues
1424		 */
1425		if (skb_queue_empty(frames)) {
1426			*driver_release_tids |=
1427				sta->driver_buffered_tids & tids;
1428			*driver_release_tids |= sta->txq_buffered_tids & tids;
1429		}
1430
1431		if (!*driver_release_tids) {
1432			struct sk_buff *skb;
1433
1434			while (n_frames > 0) {
1435				skb = skb_dequeue(&sta->tx_filtered[ac]);
1436				if (!skb) {
1437					skb = skb_dequeue(
1438						&sta->ps_tx_buf[ac]);
1439					if (skb)
1440						local->total_ps_buffered--;
1441				}
1442				if (!skb)
1443					break;
1444				n_frames--;
1445				__skb_queue_tail(frames, skb);
1446			}
1447		}
1448
1449		/* If we have more frames buffered on this AC, then abort the
1450		 * loop since we can't send more data from other ACs before
1451		 * the buffered frames from this.
1452		 */
1453		if (!skb_queue_empty(&sta->tx_filtered[ac]) ||
1454		    !skb_queue_empty(&sta->ps_tx_buf[ac]))
1455			break;
1456	}
1457}
1458
1459static void
1460ieee80211_sta_ps_deliver_response(struct sta_info *sta,
1461				  int n_frames, u8 ignored_acs,
1462				  enum ieee80211_frame_release_type reason)
1463{
1464	struct ieee80211_sub_if_data *sdata = sta->sdata;
1465	struct ieee80211_local *local = sdata->local;
1466	unsigned long driver_release_tids = 0;
1467	struct sk_buff_head frames;
1468	bool more_data;
1469
1470	/* Service or PS-Poll period starts */
1471	set_sta_flag(sta, WLAN_STA_SP);
1472
1473	__skb_queue_head_init(&frames);
1474
1475	ieee80211_sta_ps_get_frames(sta, n_frames, ignored_acs, reason,
1476				    &frames, &driver_release_tids);
1477
1478	more_data = ieee80211_sta_ps_more_data(sta, ignored_acs, reason, driver_release_tids);
1479
1480	if (driver_release_tids && reason == IEEE80211_FRAME_RELEASE_PSPOLL)
1481		driver_release_tids =
1482			BIT(find_highest_prio_tid(driver_release_tids));
1483
1484	if (skb_queue_empty(&frames) && !driver_release_tids) {
1485		int tid, ac;
1486
1487		/*
1488		 * For PS-Poll, this can only happen due to a race condition
1489		 * when we set the TIM bit and the station notices it, but
1490		 * before it can poll for the frame we expire it.
1491		 *
1492		 * For uAPSD, this is said in the standard (11.2.1.5 h):
1493		 *	At each unscheduled SP for a non-AP STA, the AP shall
1494		 *	attempt to transmit at least one MSDU or MMPDU, but no
1495		 *	more than the value specified in the Max SP Length field
1496		 *	in the QoS Capability element from delivery-enabled ACs,
1497		 *	that are destined for the non-AP STA.
1498		 *
1499		 * Since we have no other MSDU/MMPDU, transmit a QoS null frame.
1500		 */
1501
1502		/* This will evaluate to 1, 3, 5 or 7. */
1503		for (ac = IEEE80211_AC_VO; ac < IEEE80211_NUM_ACS; ac++)
1504			if (!(ignored_acs & ieee80211_ac_to_qos_mask[ac]))
1505				break;
1506		tid = 7 - 2 * ac;
1507
1508		ieee80211_send_null_response(sta, tid, reason, true, false);
1509	} else if (!driver_release_tids) {
1510		struct sk_buff_head pending;
1511		struct sk_buff *skb;
1512		int num = 0;
1513		u16 tids = 0;
1514		bool need_null = false;
1515
1516		skb_queue_head_init(&pending);
1517
1518		while ((skb = __skb_dequeue(&frames))) {
1519			struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1520			struct ieee80211_hdr *hdr = (void *) skb->data;
1521			u8 *qoshdr = NULL;
1522
1523			num++;
1524
1525			/*
1526			 * Tell TX path to send this frame even though the
1527			 * STA may still remain is PS mode after this frame
1528			 * exchange.
1529			 */
1530			info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
1531			info->control.flags |= IEEE80211_TX_CTRL_PS_RESPONSE;
1532
1533			/*
1534			 * Use MoreData flag to indicate whether there are
1535			 * more buffered frames for this STA
1536			 */
1537			if (more_data || !skb_queue_empty(&frames))
1538				hdr->frame_control |=
1539					cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1540			else
1541				hdr->frame_control &=
1542					cpu_to_le16(~IEEE80211_FCTL_MOREDATA);
1543
1544			if (ieee80211_is_data_qos(hdr->frame_control) ||
1545			    ieee80211_is_qos_nullfunc(hdr->frame_control))
1546				qoshdr = ieee80211_get_qos_ctl(hdr);
1547
1548			tids |= BIT(skb->priority);
1549
1550			__skb_queue_tail(&pending, skb);
1551
1552			/* end service period after last frame or add one */
1553			if (!skb_queue_empty(&frames))
1554				continue;
1555
1556			if (reason != IEEE80211_FRAME_RELEASE_UAPSD) {
1557				/* for PS-Poll, there's only one frame */
1558				info->flags |= IEEE80211_TX_STATUS_EOSP |
1559					       IEEE80211_TX_CTL_REQ_TX_STATUS;
1560				break;
1561			}
1562
1563			/* For uAPSD, things are a bit more complicated. If the
1564			 * last frame has a QoS header (i.e. is a QoS-data or
1565			 * QoS-nulldata frame) then just set the EOSP bit there
1566			 * and be done.
1567			 * If the frame doesn't have a QoS header (which means
1568			 * it should be a bufferable MMPDU) then we can't set
1569			 * the EOSP bit in the QoS header; add a QoS-nulldata
1570			 * frame to the list to send it after the MMPDU.
1571			 *
1572			 * Note that this code is only in the mac80211-release
1573			 * code path, we assume that the driver will not buffer
1574			 * anything but QoS-data frames, or if it does, will
1575			 * create the QoS-nulldata frame by itself if needed.
1576			 *
1577			 * Cf. 802.11-2012 10.2.1.10 (c).
1578			 */
1579			if (qoshdr) {
1580				*qoshdr |= IEEE80211_QOS_CTL_EOSP;
1581
1582				info->flags |= IEEE80211_TX_STATUS_EOSP |
1583					       IEEE80211_TX_CTL_REQ_TX_STATUS;
1584			} else {
1585				/* The standard isn't completely clear on this
1586				 * as it says the more-data bit should be set
1587				 * if there are more BUs. The QoS-Null frame
1588				 * we're about to send isn't buffered yet, we
1589				 * only create it below, but let's pretend it
1590				 * was buffered just in case some clients only
1591				 * expect more-data=0 when eosp=1.
1592				 */
1593				hdr->frame_control |=
1594					cpu_to_le16(IEEE80211_FCTL_MOREDATA);
1595				need_null = true;
1596				num++;
1597			}
1598			break;
1599		}
1600
1601		drv_allow_buffered_frames(local, sta, tids, num,
1602					  reason, more_data);
1603
1604		ieee80211_add_pending_skbs(local, &pending);
1605
1606		if (need_null)
1607			ieee80211_send_null_response(
1608				sta, find_highest_prio_tid(tids),
1609				reason, false, false);
1610
1611		sta_info_recalc_tim(sta);
1612	} else {
1613		int tid;
1614
1615		/*
1616		 * We need to release a frame that is buffered somewhere in the
1617		 * driver ... it'll have to handle that.
1618		 * Note that the driver also has to check the number of frames
1619		 * on the TIDs we're releasing from - if there are more than
1620		 * n_frames it has to set the more-data bit (if we didn't ask
1621		 * it to set it anyway due to other buffered frames); if there
1622		 * are fewer than n_frames it has to make sure to adjust that
1623		 * to allow the service period to end properly.
1624		 */
1625		drv_release_buffered_frames(local, sta, driver_release_tids,
1626					    n_frames, reason, more_data);
1627
1628		/*
1629		 * Note that we don't recalculate the TIM bit here as it would
1630		 * most likely have no effect at all unless the driver told us
1631		 * that the TID(s) became empty before returning here from the
1632		 * release function.
1633		 * Either way, however, when the driver tells us that the TID(s)
1634		 * became empty or we find that a txq became empty, we'll do the
1635		 * TIM recalculation.
1636		 */
1637
1638		if (!sta->sta.txq[0])
1639			return;
1640
1641		for (tid = 0; tid < ARRAY_SIZE(sta->sta.txq); tid++) {
1642			if (!(driver_release_tids & BIT(tid)) ||
1643			    txq_has_queue(sta->sta.txq[tid]))
1644				continue;
1645
1646			sta_info_recalc_tim(sta);
1647			break;
1648		}
1649	}
1650}
1651
1652void ieee80211_sta_ps_deliver_poll_response(struct sta_info *sta)
1653{
1654	u8 ignore_for_response = sta->sta.uapsd_queues;
1655
1656	/*
1657	 * If all ACs are delivery-enabled then we should reply
1658	 * from any of them, if only some are enabled we reply
1659	 * only from the non-enabled ones.
1660	 */
1661	if (ignore_for_response == BIT(IEEE80211_NUM_ACS) - 1)
1662		ignore_for_response = 0;
1663
1664	ieee80211_sta_ps_deliver_response(sta, 1, ignore_for_response,
1665					  IEEE80211_FRAME_RELEASE_PSPOLL);
1666}
1667
1668void ieee80211_sta_ps_deliver_uapsd(struct sta_info *sta)
1669{
1670	int n_frames = sta->sta.max_sp;
1671	u8 delivery_enabled = sta->sta.uapsd_queues;
1672
1673	/*
1674	 * If we ever grow support for TSPEC this might happen if
1675	 * the TSPEC update from hostapd comes in between a trigger
1676	 * frame setting WLAN_STA_UAPSD in the RX path and this
1677	 * actually getting called.
1678	 */
1679	if (!delivery_enabled)
1680		return;
1681
1682	switch (sta->sta.max_sp) {
1683	case 1:
1684		n_frames = 2;
1685		break;
1686	case 2:
1687		n_frames = 4;
1688		break;
1689	case 3:
1690		n_frames = 6;
1691		break;
1692	case 0:
1693		/* XXX: what is a good value? */
1694		n_frames = 128;
1695		break;
1696	}
1697
1698	ieee80211_sta_ps_deliver_response(sta, n_frames, ~delivery_enabled,
1699					  IEEE80211_FRAME_RELEASE_UAPSD);
1700}
1701
1702void ieee80211_sta_block_awake(struct ieee80211_hw *hw,
1703			       struct ieee80211_sta *pubsta, bool block)
1704{
1705	struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1706
1707	trace_api_sta_block_awake(sta->local, pubsta, block);
1708
1709	if (block) {
1710		set_sta_flag(sta, WLAN_STA_PS_DRIVER);
1711		ieee80211_clear_fast_xmit(sta);
1712		return;
1713	}
1714
1715	if (!test_sta_flag(sta, WLAN_STA_PS_DRIVER))
1716		return;
1717
1718	if (!test_sta_flag(sta, WLAN_STA_PS_STA)) {
1719		set_sta_flag(sta, WLAN_STA_PS_DELIVER);
1720		clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
1721		ieee80211_queue_work(hw, &sta->drv_deliver_wk);
1722	} else if (test_sta_flag(sta, WLAN_STA_PSPOLL) ||
1723		   test_sta_flag(sta, WLAN_STA_UAPSD)) {
1724		/* must be asleep in this case */
1725		clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
1726		ieee80211_queue_work(hw, &sta->drv_deliver_wk);
1727	} else {
1728		clear_sta_flag(sta, WLAN_STA_PS_DRIVER);
1729		ieee80211_check_fast_xmit(sta);
1730	}
1731}
1732EXPORT_SYMBOL(ieee80211_sta_block_awake);
1733
1734void ieee80211_sta_eosp(struct ieee80211_sta *pubsta)
1735{
1736	struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1737	struct ieee80211_local *local = sta->local;
1738
1739	trace_api_eosp(local, pubsta);
1740
1741	clear_sta_flag(sta, WLAN_STA_SP);
1742}
1743EXPORT_SYMBOL(ieee80211_sta_eosp);
1744
1745void ieee80211_send_eosp_nullfunc(struct ieee80211_sta *pubsta, int tid)
1746{
1747	struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1748	enum ieee80211_frame_release_type reason;
1749	bool more_data;
1750
1751	trace_api_send_eosp_nullfunc(sta->local, pubsta, tid);
1752
1753	reason = IEEE80211_FRAME_RELEASE_UAPSD;
1754	more_data = ieee80211_sta_ps_more_data(sta, ~sta->sta.uapsd_queues,
1755					       reason, 0);
1756
1757	ieee80211_send_null_response(sta, tid, reason, false, more_data);
1758}
1759EXPORT_SYMBOL(ieee80211_send_eosp_nullfunc);
1760
1761void ieee80211_sta_set_buffered(struct ieee80211_sta *pubsta,
1762				u8 tid, bool buffered)
1763{
1764	struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
1765
1766	if (WARN_ON(tid >= IEEE80211_NUM_TIDS))
1767		return;
1768
1769	trace_api_sta_set_buffered(sta->local, pubsta, tid, buffered);
1770
1771	if (buffered)
1772		set_bit(tid, &sta->driver_buffered_tids);
1773	else
1774		clear_bit(tid, &sta->driver_buffered_tids);
1775
1776	sta_info_recalc_tim(sta);
1777}
1778EXPORT_SYMBOL(ieee80211_sta_set_buffered);
1779
1780static void
1781ieee80211_recalc_p2p_go_ps_allowed(struct ieee80211_sub_if_data *sdata)
1782{
1783	struct ieee80211_local *local = sdata->local;
1784	bool allow_p2p_go_ps = sdata->vif.p2p;
1785	struct sta_info *sta;
1786
1787	rcu_read_lock();
1788	list_for_each_entry_rcu(sta, &local->sta_list, list) {
1789		if (sdata != sta->sdata ||
1790		    !test_sta_flag(sta, WLAN_STA_ASSOC))
1791			continue;
1792		if (!sta->sta.support_p2p_ps) {
1793			allow_p2p_go_ps = false;
1794			break;
1795		}
1796	}
1797	rcu_read_unlock();
1798
1799	if (allow_p2p_go_ps != sdata->vif.bss_conf.allow_p2p_go_ps) {
1800		sdata->vif.bss_conf.allow_p2p_go_ps = allow_p2p_go_ps;
1801		ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_P2P_PS);
1802	}
1803}
1804
1805int sta_info_move_state(struct sta_info *sta,
1806			enum ieee80211_sta_state new_state)
1807{
1808	might_sleep();
1809
1810	if (sta->sta_state == new_state)
1811		return 0;
1812
1813	/* check allowed transitions first */
1814
1815	switch (new_state) {
1816	case IEEE80211_STA_NONE:
1817		if (sta->sta_state != IEEE80211_STA_AUTH)
1818			return -EINVAL;
1819		break;
1820	case IEEE80211_STA_AUTH:
1821		if (sta->sta_state != IEEE80211_STA_NONE &&
1822		    sta->sta_state != IEEE80211_STA_ASSOC)
1823			return -EINVAL;
1824		break;
1825	case IEEE80211_STA_ASSOC:
1826		if (sta->sta_state != IEEE80211_STA_AUTH &&
1827		    sta->sta_state != IEEE80211_STA_AUTHORIZED)
1828			return -EINVAL;
1829		break;
1830	case IEEE80211_STA_AUTHORIZED:
1831		if (sta->sta_state != IEEE80211_STA_ASSOC)
1832			return -EINVAL;
1833		break;
1834	default:
1835		WARN(1, "invalid state %d", new_state);
1836		return -EINVAL;
1837	}
1838
1839	sta_dbg(sta->sdata, "moving STA %pM to state %d\n",
1840		sta->sta.addr, new_state);
1841
1842	/*
1843	 * notify the driver before the actual changes so it can
1844	 * fail the transition
1845	 */
1846	if (test_sta_flag(sta, WLAN_STA_INSERTED)) {
1847		int err = drv_sta_state(sta->local, sta->sdata, sta,
1848					sta->sta_state, new_state);
1849		if (err)
1850			return err;
1851	}
1852
1853	/* reflect the change in all state variables */
1854
1855	switch (new_state) {
1856	case IEEE80211_STA_NONE:
1857		if (sta->sta_state == IEEE80211_STA_AUTH)
1858			clear_bit(WLAN_STA_AUTH, &sta->_flags);
1859		break;
1860	case IEEE80211_STA_AUTH:
1861		if (sta->sta_state == IEEE80211_STA_NONE) {
1862			set_bit(WLAN_STA_AUTH, &sta->_flags);
1863		} else if (sta->sta_state == IEEE80211_STA_ASSOC) {
1864			clear_bit(WLAN_STA_ASSOC, &sta->_flags);
1865			ieee80211_recalc_min_chandef(sta->sdata);
1866			if (!sta->sta.support_p2p_ps)
1867				ieee80211_recalc_p2p_go_ps_allowed(sta->sdata);
1868		}
1869		break;
1870	case IEEE80211_STA_ASSOC:
1871		if (sta->sta_state == IEEE80211_STA_AUTH) {
1872			set_bit(WLAN_STA_ASSOC, &sta->_flags);
1873			ieee80211_recalc_min_chandef(sta->sdata);
1874			if (!sta->sta.support_p2p_ps)
1875				ieee80211_recalc_p2p_go_ps_allowed(sta->sdata);
1876		} else if (sta->sta_state == IEEE80211_STA_AUTHORIZED) {
1877			ieee80211_vif_dec_num_mcast(sta->sdata);
1878			clear_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
1879			ieee80211_clear_fast_xmit(sta);
1880			ieee80211_clear_fast_rx(sta);
1881		}
1882		break;
1883	case IEEE80211_STA_AUTHORIZED:
1884		if (sta->sta_state == IEEE80211_STA_ASSOC) {
1885			ieee80211_vif_inc_num_mcast(sta->sdata);
1886			set_bit(WLAN_STA_AUTHORIZED, &sta->_flags);
1887			ieee80211_check_fast_xmit(sta);
1888			ieee80211_check_fast_rx(sta);
1889		}
1890		break;
1891	default:
1892		break;
1893	}
1894
1895	sta->sta_state = new_state;
1896
1897	return 0;
1898}
1899
1900u8 sta_info_tx_streams(struct sta_info *sta)
1901{
1902	struct ieee80211_sta_ht_cap *ht_cap = &sta->sta.ht_cap;
1903	u8 rx_streams;
1904
1905	if (!sta->sta.ht_cap.ht_supported)
1906		return 1;
1907
1908	if (sta->sta.vht_cap.vht_supported) {
1909		int i;
1910		u16 tx_mcs_map =
1911			le16_to_cpu(sta->sta.vht_cap.vht_mcs.tx_mcs_map);
1912
1913		for (i = 7; i >= 0; i--)
1914			if ((tx_mcs_map & (0x3 << (i * 2))) !=
1915			    IEEE80211_VHT_MCS_NOT_SUPPORTED)
1916				return i + 1;
1917	}
1918
1919	if (ht_cap->mcs.rx_mask[3])
1920		rx_streams = 4;
1921	else if (ht_cap->mcs.rx_mask[2])
1922		rx_streams = 3;
1923	else if (ht_cap->mcs.rx_mask[1])
1924		rx_streams = 2;
1925	else
1926		rx_streams = 1;
1927
1928	if (!(ht_cap->mcs.tx_params & IEEE80211_HT_MCS_TX_RX_DIFF))
1929		return rx_streams;
1930
1931	return ((ht_cap->mcs.tx_params & IEEE80211_HT_MCS_TX_MAX_STREAMS_MASK)
1932			>> IEEE80211_HT_MCS_TX_MAX_STREAMS_SHIFT) + 1;
1933}
1934
1935static struct ieee80211_sta_rx_stats *
1936sta_get_last_rx_stats(struct sta_info *sta)
1937{
1938	struct ieee80211_sta_rx_stats *stats = &sta->rx_stats;
1939	struct ieee80211_local *local = sta->local;
1940	int cpu;
1941
1942	if (!ieee80211_hw_check(&local->hw, USES_RSS))
1943		return stats;
1944
1945	for_each_possible_cpu(cpu) {
1946		struct ieee80211_sta_rx_stats *cpustats;
1947
1948		cpustats = per_cpu_ptr(sta->pcpu_rx_stats, cpu);
1949
1950		if (time_after(cpustats->last_rx, stats->last_rx))
1951			stats = cpustats;
1952	}
1953
1954	return stats;
1955}
1956
1957static void sta_stats_decode_rate(struct ieee80211_local *local, u16 rate,
1958				  struct rate_info *rinfo)
1959{
1960	rinfo->bw = (rate & STA_STATS_RATE_BW_MASK) >>
1961		STA_STATS_RATE_BW_SHIFT;
1962
1963	if (rate & STA_STATS_RATE_VHT) {
 
1964		rinfo->flags = RATE_INFO_FLAGS_VHT_MCS;
1965		rinfo->mcs = rate & 0xf;
1966		rinfo->nss = (rate & 0xf0) >> 4;
1967	} else if (rate & STA_STATS_RATE_HT) {
 
 
 
1968		rinfo->flags = RATE_INFO_FLAGS_MCS;
1969		rinfo->mcs = rate & 0xff;
1970	} else if (rate & STA_STATS_RATE_LEGACY) {
 
 
 
1971		struct ieee80211_supported_band *sband;
1972		u16 brate;
1973		unsigned int shift;
 
 
1974
1975		rinfo->flags = 0;
1976		sband = local->hw.wiphy->bands[(rate >> 4) & 0xf];
1977		brate = sband->bitrates[rate & 0xf].bitrate;
1978		if (rinfo->bw == RATE_INFO_BW_5)
1979			shift = 2;
1980		else if (rinfo->bw == RATE_INFO_BW_10)
1981			shift = 1;
1982		else
1983			shift = 0;
1984		rinfo->legacy = DIV_ROUND_UP(brate, 1 << shift);
 
 
1985	}
1986
1987	if (rate & STA_STATS_RATE_SGI)
1988		rinfo->flags |= RATE_INFO_FLAGS_SHORT_GI;
1989}
1990
1991static int sta_set_rate_info_rx(struct sta_info *sta, struct rate_info *rinfo)
1992{
1993	u16 rate = ACCESS_ONCE(sta_get_last_rx_stats(sta)->last_rate);
1994
1995	if (rate == STA_STATS_RATE_INVALID)
1996		return -EINVAL;
1997
1998	sta_stats_decode_rate(sta->local, rate, rinfo);
1999	return 0;
2000}
2001
2002static void sta_set_tidstats(struct sta_info *sta,
2003			     struct cfg80211_tid_stats *tidstats,
2004			     int tid)
2005{
2006	struct ieee80211_local *local = sta->local;
2007
2008	if (!(tidstats->filled & BIT(NL80211_TID_STATS_RX_MSDU))) {
2009		unsigned int start;
2010
2011		do {
2012			start = u64_stats_fetch_begin(&sta->rx_stats.syncp);
2013			tidstats->rx_msdu = sta->rx_stats.msdu[tid];
2014		} while (u64_stats_fetch_retry(&sta->rx_stats.syncp, start));
2015
2016		tidstats->filled |= BIT(NL80211_TID_STATS_RX_MSDU);
2017	}
2018
2019	if (!(tidstats->filled & BIT(NL80211_TID_STATS_TX_MSDU))) {
2020		tidstats->filled |= BIT(NL80211_TID_STATS_TX_MSDU);
2021		tidstats->tx_msdu = sta->tx_stats.msdu[tid];
2022	}
2023
2024	if (!(tidstats->filled & BIT(NL80211_TID_STATS_TX_MSDU_RETRIES)) &&
2025	    ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
2026		tidstats->filled |= BIT(NL80211_TID_STATS_TX_MSDU_RETRIES);
2027		tidstats->tx_msdu_retries = sta->status_stats.msdu_retries[tid];
2028	}
2029
2030	if (!(tidstats->filled & BIT(NL80211_TID_STATS_TX_MSDU_FAILED)) &&
2031	    ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
2032		tidstats->filled |= BIT(NL80211_TID_STATS_TX_MSDU_FAILED);
2033		tidstats->tx_msdu_failed = sta->status_stats.msdu_failed[tid];
2034	}
2035}
2036
2037static inline u64 sta_get_stats_bytes(struct ieee80211_sta_rx_stats *rxstats)
2038{
2039	unsigned int start;
2040	u64 value;
2041
2042	do {
2043		start = u64_stats_fetch_begin(&rxstats->syncp);
2044		value = rxstats->bytes;
2045	} while (u64_stats_fetch_retry(&rxstats->syncp, start));
2046
2047	return value;
2048}
2049
2050void sta_set_sinfo(struct sta_info *sta, struct station_info *sinfo)
2051{
2052	struct ieee80211_sub_if_data *sdata = sta->sdata;
2053	struct ieee80211_local *local = sdata->local;
2054	struct rate_control_ref *ref = NULL;
2055	u32 thr = 0;
2056	int i, ac, cpu;
2057	struct ieee80211_sta_rx_stats *last_rxstats;
2058
2059	last_rxstats = sta_get_last_rx_stats(sta);
2060
2061	if (test_sta_flag(sta, WLAN_STA_RATE_CONTROL))
2062		ref = local->rate_ctrl;
2063
2064	sinfo->generation = sdata->local->sta_generation;
2065
2066	/* do before driver, so beacon filtering drivers have a
2067	 * chance to e.g. just add the number of filtered beacons
2068	 * (or just modify the value entirely, of course)
2069	 */
2070	if (sdata->vif.type == NL80211_IFTYPE_STATION)
2071		sinfo->rx_beacon = sdata->u.mgd.count_beacon_signal;
2072
2073	drv_sta_statistics(local, sdata, &sta->sta, sinfo);
2074
2075	sinfo->filled |= BIT(NL80211_STA_INFO_INACTIVE_TIME) |
2076			 BIT(NL80211_STA_INFO_STA_FLAGS) |
2077			 BIT(NL80211_STA_INFO_BSS_PARAM) |
2078			 BIT(NL80211_STA_INFO_CONNECTED_TIME) |
2079			 BIT(NL80211_STA_INFO_RX_DROP_MISC);
2080
2081	if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2082		sinfo->beacon_loss_count = sdata->u.mgd.beacon_loss_count;
2083		sinfo->filled |= BIT(NL80211_STA_INFO_BEACON_LOSS);
2084	}
2085
2086	sinfo->connected_time = ktime_get_seconds() - sta->last_connected;
2087	sinfo->inactive_time =
2088		jiffies_to_msecs(jiffies - ieee80211_sta_last_active(sta));
2089
2090	if (!(sinfo->filled & (BIT(NL80211_STA_INFO_TX_BYTES64) |
2091			       BIT(NL80211_STA_INFO_TX_BYTES)))) {
2092		sinfo->tx_bytes = 0;
2093		for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
2094			sinfo->tx_bytes += sta->tx_stats.bytes[ac];
2095		sinfo->filled |= BIT(NL80211_STA_INFO_TX_BYTES64);
2096	}
2097
2098	if (!(sinfo->filled & BIT(NL80211_STA_INFO_TX_PACKETS))) {
2099		sinfo->tx_packets = 0;
2100		for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
2101			sinfo->tx_packets += sta->tx_stats.packets[ac];
2102		sinfo->filled |= BIT(NL80211_STA_INFO_TX_PACKETS);
2103	}
2104
2105	if (!(sinfo->filled & (BIT(NL80211_STA_INFO_RX_BYTES64) |
2106			       BIT(NL80211_STA_INFO_RX_BYTES)))) {
2107		sinfo->rx_bytes += sta_get_stats_bytes(&sta->rx_stats);
2108
2109		if (sta->pcpu_rx_stats) {
2110			for_each_possible_cpu(cpu) {
2111				struct ieee80211_sta_rx_stats *cpurxs;
2112
2113				cpurxs = per_cpu_ptr(sta->pcpu_rx_stats, cpu);
2114				sinfo->rx_bytes += sta_get_stats_bytes(cpurxs);
2115			}
2116		}
2117
2118		sinfo->filled |= BIT(NL80211_STA_INFO_RX_BYTES64);
2119	}
2120
2121	if (!(sinfo->filled & BIT(NL80211_STA_INFO_RX_PACKETS))) {
2122		sinfo->rx_packets = sta->rx_stats.packets;
2123		if (sta->pcpu_rx_stats) {
2124			for_each_possible_cpu(cpu) {
2125				struct ieee80211_sta_rx_stats *cpurxs;
2126
2127				cpurxs = per_cpu_ptr(sta->pcpu_rx_stats, cpu);
2128				sinfo->rx_packets += cpurxs->packets;
2129			}
2130		}
2131		sinfo->filled |= BIT(NL80211_STA_INFO_RX_PACKETS);
2132	}
2133
2134	if (!(sinfo->filled & BIT(NL80211_STA_INFO_TX_RETRIES))) {
2135		sinfo->tx_retries = sta->status_stats.retry_count;
2136		sinfo->filled |= BIT(NL80211_STA_INFO_TX_RETRIES);
2137	}
2138
2139	if (!(sinfo->filled & BIT(NL80211_STA_INFO_TX_FAILED))) {
2140		sinfo->tx_failed = sta->status_stats.retry_failed;
2141		sinfo->filled |= BIT(NL80211_STA_INFO_TX_FAILED);
2142	}
2143
2144	sinfo->rx_dropped_misc = sta->rx_stats.dropped;
2145	if (sta->pcpu_rx_stats) {
2146		for_each_possible_cpu(cpu) {
2147			struct ieee80211_sta_rx_stats *cpurxs;
2148
2149			cpurxs = per_cpu_ptr(sta->pcpu_rx_stats, cpu);
2150			sinfo->rx_packets += cpurxs->dropped;
2151		}
2152	}
2153
2154	if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2155	    !(sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)) {
2156		sinfo->filled |= BIT(NL80211_STA_INFO_BEACON_RX) |
2157				 BIT(NL80211_STA_INFO_BEACON_SIGNAL_AVG);
2158		sinfo->rx_beacon_signal_avg = ieee80211_ave_rssi(&sdata->vif);
2159	}
2160
2161	if (ieee80211_hw_check(&sta->local->hw, SIGNAL_DBM) ||
2162	    ieee80211_hw_check(&sta->local->hw, SIGNAL_UNSPEC)) {
2163		if (!(sinfo->filled & BIT(NL80211_STA_INFO_SIGNAL))) {
2164			sinfo->signal = (s8)last_rxstats->last_signal;
2165			sinfo->filled |= BIT(NL80211_STA_INFO_SIGNAL);
2166		}
2167
2168		if (!sta->pcpu_rx_stats &&
2169		    !(sinfo->filled & BIT(NL80211_STA_INFO_SIGNAL_AVG))) {
2170			sinfo->signal_avg =
2171				-ewma_signal_read(&sta->rx_stats_avg.signal);
2172			sinfo->filled |= BIT(NL80211_STA_INFO_SIGNAL_AVG);
2173		}
2174	}
2175
2176	/* for the average - if pcpu_rx_stats isn't set - rxstats must point to
2177	 * the sta->rx_stats struct, so the check here is fine with and without
2178	 * pcpu statistics
2179	 */
2180	if (last_rxstats->chains &&
2181	    !(sinfo->filled & (BIT(NL80211_STA_INFO_CHAIN_SIGNAL) |
2182			       BIT(NL80211_STA_INFO_CHAIN_SIGNAL_AVG)))) {
2183		sinfo->filled |= BIT(NL80211_STA_INFO_CHAIN_SIGNAL);
2184		if (!sta->pcpu_rx_stats)
2185			sinfo->filled |= BIT(NL80211_STA_INFO_CHAIN_SIGNAL_AVG);
2186
2187		sinfo->chains = last_rxstats->chains;
2188
2189		for (i = 0; i < ARRAY_SIZE(sinfo->chain_signal); i++) {
2190			sinfo->chain_signal[i] =
2191				last_rxstats->chain_signal_last[i];
2192			sinfo->chain_signal_avg[i] =
2193				-ewma_signal_read(&sta->rx_stats_avg.chain_signal[i]);
2194		}
2195	}
2196
2197	if (!(sinfo->filled & BIT(NL80211_STA_INFO_TX_BITRATE))) {
2198		sta_set_rate_info_tx(sta, &sta->tx_stats.last_rate,
2199				     &sinfo->txrate);
2200		sinfo->filled |= BIT(NL80211_STA_INFO_TX_BITRATE);
2201	}
2202
2203	if (!(sinfo->filled & BIT(NL80211_STA_INFO_RX_BITRATE))) {
2204		if (sta_set_rate_info_rx(sta, &sinfo->rxrate) == 0)
2205			sinfo->filled |= BIT(NL80211_STA_INFO_RX_BITRATE);
2206	}
2207
2208	sinfo->filled |= BIT(NL80211_STA_INFO_TID_STATS);
2209	for (i = 0; i < IEEE80211_NUM_TIDS + 1; i++) {
2210		struct cfg80211_tid_stats *tidstats = &sinfo->pertid[i];
2211
2212		sta_set_tidstats(sta, tidstats, i);
2213	}
2214
2215	if (ieee80211_vif_is_mesh(&sdata->vif)) {
2216#ifdef CONFIG_MAC80211_MESH
2217		sinfo->filled |= BIT(NL80211_STA_INFO_LLID) |
2218				 BIT(NL80211_STA_INFO_PLID) |
2219				 BIT(NL80211_STA_INFO_PLINK_STATE) |
2220				 BIT(NL80211_STA_INFO_LOCAL_PM) |
2221				 BIT(NL80211_STA_INFO_PEER_PM) |
2222				 BIT(NL80211_STA_INFO_NONPEER_PM);
2223
2224		sinfo->llid = sta->mesh->llid;
2225		sinfo->plid = sta->mesh->plid;
2226		sinfo->plink_state = sta->mesh->plink_state;
2227		if (test_sta_flag(sta, WLAN_STA_TOFFSET_KNOWN)) {
2228			sinfo->filled |= BIT(NL80211_STA_INFO_T_OFFSET);
2229			sinfo->t_offset = sta->mesh->t_offset;
2230		}
2231		sinfo->local_pm = sta->mesh->local_pm;
2232		sinfo->peer_pm = sta->mesh->peer_pm;
2233		sinfo->nonpeer_pm = sta->mesh->nonpeer_pm;
2234#endif
2235	}
2236
2237	sinfo->bss_param.flags = 0;
2238	if (sdata->vif.bss_conf.use_cts_prot)
2239		sinfo->bss_param.flags |= BSS_PARAM_FLAGS_CTS_PROT;
2240	if (sdata->vif.bss_conf.use_short_preamble)
2241		sinfo->bss_param.flags |= BSS_PARAM_FLAGS_SHORT_PREAMBLE;
2242	if (sdata->vif.bss_conf.use_short_slot)
2243		sinfo->bss_param.flags |= BSS_PARAM_FLAGS_SHORT_SLOT_TIME;
2244	sinfo->bss_param.dtim_period = sdata->vif.bss_conf.dtim_period;
2245	sinfo->bss_param.beacon_interval = sdata->vif.bss_conf.beacon_int;
2246
2247	sinfo->sta_flags.set = 0;
2248	sinfo->sta_flags.mask = BIT(NL80211_STA_FLAG_AUTHORIZED) |
2249				BIT(NL80211_STA_FLAG_SHORT_PREAMBLE) |
2250				BIT(NL80211_STA_FLAG_WME) |
2251				BIT(NL80211_STA_FLAG_MFP) |
2252				BIT(NL80211_STA_FLAG_AUTHENTICATED) |
2253				BIT(NL80211_STA_FLAG_ASSOCIATED) |
2254				BIT(NL80211_STA_FLAG_TDLS_PEER);
2255	if (test_sta_flag(sta, WLAN_STA_AUTHORIZED))
2256		sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_AUTHORIZED);
2257	if (test_sta_flag(sta, WLAN_STA_SHORT_PREAMBLE))
2258		sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_SHORT_PREAMBLE);
2259	if (sta->sta.wme)
2260		sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_WME);
2261	if (test_sta_flag(sta, WLAN_STA_MFP))
2262		sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_MFP);
2263	if (test_sta_flag(sta, WLAN_STA_AUTH))
2264		sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_AUTHENTICATED);
2265	if (test_sta_flag(sta, WLAN_STA_ASSOC))
2266		sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_ASSOCIATED);
2267	if (test_sta_flag(sta, WLAN_STA_TDLS_PEER))
2268		sinfo->sta_flags.set |= BIT(NL80211_STA_FLAG_TDLS_PEER);
2269
2270	thr = sta_get_expected_throughput(sta);
2271
2272	if (thr != 0) {
2273		sinfo->filled |= BIT(NL80211_STA_INFO_EXPECTED_THROUGHPUT);
2274		sinfo->expected_throughput = thr;
2275	}
 
 
 
 
 
 
2276}
2277
2278u32 sta_get_expected_throughput(struct sta_info *sta)
2279{
2280	struct ieee80211_sub_if_data *sdata = sta->sdata;
2281	struct ieee80211_local *local = sdata->local;
2282	struct rate_control_ref *ref = NULL;
2283	u32 thr = 0;
2284
2285	if (test_sta_flag(sta, WLAN_STA_RATE_CONTROL))
2286		ref = local->rate_ctrl;
2287
2288	/* check if the driver has a SW RC implementation */
2289	if (ref && ref->ops->get_expected_throughput)
2290		thr = ref->ops->get_expected_throughput(sta->rate_ctrl_priv);
2291	else
2292		thr = drv_get_expected_throughput(local, sta);
2293
2294	return thr;
2295}
2296
2297unsigned long ieee80211_sta_last_active(struct sta_info *sta)
2298{
2299	struct ieee80211_sta_rx_stats *stats = sta_get_last_rx_stats(sta);
2300
2301	if (time_after(stats->last_rx, sta->status_stats.last_ack))
2302		return stats->last_rx;
2303	return sta->status_stats.last_ack;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2304}