mlme.c 77 KB
Newer Older
1 2
/*
 * BSS client mode implementation
3
 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
4 5 6 7 8 9 10 11 12 13
 * Copyright 2004, Instant802 Networks, Inc.
 * Copyright 2005, Devicescape Software, Inc.
 * Copyright 2006-2007	Jiri Benc <jbenc@suse.cz>
 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

14
#include <linux/delay.h>
15 16 17 18
#include <linux/if_ether.h>
#include <linux/skbuff.h>
#include <linux/if_arp.h>
#include <linux/etherdevice.h>
19
#include <linux/rtnetlink.h>
20
#include <linux/pm_qos_params.h>
21
#include <linux/crc32.h>
22
#include <linux/slab.h>
23
#include <net/mac80211.h>
24
#include <asm/unaligned.h>
Johannes Berg's avatar
Johannes Berg committed
25

26
#include "ieee80211_i.h"
27
#include "driver-ops.h"
Johannes Berg's avatar
Johannes Berg committed
28 29
#include "rate.h"
#include "led.h"
30

31 32 33 34 35 36 37 38 39
static int max_nullfunc_tries = 2;
module_param(max_nullfunc_tries, int, 0644);
MODULE_PARM_DESC(max_nullfunc_tries,
		 "Maximum nullfunc tx tries before disconnecting (reason 4).");

static int max_probe_tries = 5;
module_param(max_probe_tries, int, 0644);
MODULE_PARM_DESC(max_probe_tries,
		 "Maximum probe tries before disconnecting (reason 4).");
40 41

/*
42 43 44 45 46 47
 * Beacon loss timeout is calculated as N frames times the
 * advertised beacon interval.  This may need to be somewhat
 * higher than what hardware might detect to account for
 * delays in the host processing frames. But since we also
 * probe on beacon miss before declaring the connection lost
 * default to what we want.
48
 */
49 50
#define IEEE80211_BEACON_LOSS_COUNT	7

51 52 53 54
/*
 * Time the connection can be idle before we probe
 * it to see if we can still talk to the AP.
 */
55
#define IEEE80211_CONNECTION_IDLE_TIME	(30 * HZ)
56 57 58 59 60
/*
 * Time we wait for a probe response after sending
 * a probe request because of beacon loss or for
 * checking the connection still works.
 */
61 62 63 64 65
static int probe_wait_ms = 500;
module_param(probe_wait_ms, int, 0644);
MODULE_PARM_DESC(probe_wait_ms,
		 "Maximum time(ms) to wait for probe response"
		 " before disconnecting (reason 4).");
66

67 68 69 70 71 72 73
/*
 * Weight given to the latest Beacon frame when calculating average signal
 * strength for Beacon frames received in the current BSS. This must be
 * between 1 and 15.
 */
#define IEEE80211_SIGNAL_AVE_WEIGHT	3

74 75 76 77 78 79
/*
 * How many Beacon frames need to have been used in average signal strength
 * before starting to indicate signal change events.
 */
#define IEEE80211_SIGNAL_AVE_MIN_COUNT	4

80 81 82
#define TMR_RUNNING_TIMER	0
#define TMR_RUNNING_CHANSW	1

83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99
/*
 * All cfg80211 functions have to be called outside a locked
 * section so that they can acquire a lock themselves... This
 * is much simpler than queuing up things in cfg80211, but we
 * do need some indirection for that here.
 */
enum rx_mgmt_action {
	/* no action required */
	RX_MGMT_NONE,

	/* caller must call cfg80211_send_deauth() */
	RX_MGMT_CFG80211_DEAUTH,

	/* caller must call cfg80211_send_disassoc() */
	RX_MGMT_CFG80211_DISASSOC,
};

100
/* utils */
101 102
static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
{
103
	lockdep_assert_held(&ifmgd->mtx);
104 105
}

Johannes Berg's avatar
Johannes Berg committed
106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125
/*
 * We can have multiple work items (and connection probing)
 * scheduling this timer, but we need to take care to only
 * reschedule it when it should fire _earlier_ than it was
 * asked for before, or if it's not pending right now. This
 * function ensures that. Note that it then is required to
 * run this function for all timeouts after the first one
 * has happened -- the work that runs from this timer will
 * do that.
 */
static void run_again(struct ieee80211_if_managed *ifmgd,
			     unsigned long timeout)
{
	ASSERT_MGD_MTX(ifmgd);

	if (!timer_pending(&ifmgd->timer) ||
	    time_before(timeout, ifmgd->timer.expires))
		mod_timer(&ifmgd->timer, timeout);
}

126
void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
127 128 129 130 131
{
	if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
		return;

	mod_timer(&sdata->u.mgd.bcn_mon_timer,
132
		  round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
133 134
}

135 136
void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
{
137 138
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

139 140 141
	if (unlikely(!sdata->u.mgd.associated))
		return;

142 143 144 145 146
	if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
		return;

	mod_timer(&sdata->u.mgd.conn_mon_timer,
		  round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
147 148

	ifmgd->probe_send_count = 0;
149 150
}

151
static int ecw2cw(int ecw)
Johannes Berg's avatar
Johannes Berg committed
152
{
153
	return (1 << ecw) - 1;
Johannes Berg's avatar
Johannes Berg committed
154 155
}

156 157 158 159 160 161 162
/*
 * ieee80211_enable_ht should be called only after the operating band
 * has been determined as ht configuration depends on the hw's
 * HT abilities for a specific band.
 */
static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
			       struct ieee80211_ht_info *hti,
163
			       const u8 *bssid, u16 ap_ht_cap_flags)
164 165 166 167 168
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_supported_band *sband;
	struct sta_info *sta;
	u32 changed = 0;
169
	int hti_cfreq;
170
	u16 ht_opmode;
171 172
	bool enable_ht = true;
	enum nl80211_channel_type prev_chantype;
173 174 175 176
	enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;

	sband = local->hw.wiphy->bands[local->hw.conf.channel->band];

177 178
	prev_chantype = sdata->vif.bss_conf.channel_type;

179 180 181 182
	/* HT is not supported */
	if (!sband->ht_cap.ht_supported)
		enable_ht = false;

183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203
	if (enable_ht) {
		hti_cfreq = ieee80211_channel_to_frequency(hti->control_chan,
							   sband->band);
		/* check that channel matches the right operating channel */
		if (local->hw.conf.channel->center_freq != hti_cfreq) {
			/* Some APs mess this up, evidently.
			 * Netgear WNDR3700 sometimes reports 4 higher than
			 * the actual channel, for instance.
			 */
			printk(KERN_DEBUG
			       "%s: Wrong control channel in association"
			       " response: configured center-freq: %d"
			       " hti-cfreq: %d  hti->control_chan: %d"
			       " band: %d.  Disabling HT.\n",
			       sdata->name,
			       local->hw.conf.channel->center_freq,
			       hti_cfreq, hti->control_chan,
			       sband->band);
			enable_ht = false;
		}
	}
204 205 206 207 208 209 210 211 212

	if (enable_ht) {
		channel_type = NL80211_CHAN_HT20;

		if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
		    (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
		    (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
			switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
			case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
213 214 215
				if (!(local->hw.conf.channel->flags &
				    IEEE80211_CHAN_NO_HT40PLUS))
					channel_type = NL80211_CHAN_HT40PLUS;
216 217
				break;
			case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
218 219 220
				if (!(local->hw.conf.channel->flags &
				    IEEE80211_CHAN_NO_HT40MINUS))
					channel_type = NL80211_CHAN_HT40MINUS;
221 222 223 224 225
				break;
			}
		}
	}

226 227
	if (local->tmp_channel)
		local->tmp_channel_type = channel_type;
228

229 230 231 232 233
	if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
		/* can only fail due to HT40+/- mismatch */
		channel_type = NL80211_CHAN_HT20;
		WARN_ON(!ieee80211_set_channel_type(local, sdata, channel_type));
	}
234

235 236
	/* channel_type change automatically detected */
	ieee80211_hw_config(local, 0);
237

238
	if (prev_chantype != channel_type) {
239
		rcu_read_lock();
240
		sta = sta_info_get(sdata, bssid);
241 242
		if (sta)
			rate_control_rate_update(local, sband, sta,
243
						 IEEE80211_RC_HT_CHANGED,
244
						 channel_type);
245
		rcu_read_unlock();
246
	}
247

248
	ht_opmode = le16_to_cpu(hti->operation_mode);
249 250

	/* if bss configuration changed store the new one */
251 252 253
	if (sdata->ht_opmode_valid != enable_ht ||
	    sdata->vif.bss_conf.ht_operation_mode != ht_opmode ||
	    prev_chantype != channel_type) {
254
		changed |= BSS_CHANGED_HT;
255
		sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
256
		sdata->ht_opmode_valid = enable_ht;
257 258 259 260 261
	}

	return changed;
}

262 263
/* frame sending functions */

264
static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
Johannes Berg's avatar
Johannes Berg committed
265
					   const u8 *bssid, u16 stype, u16 reason,
266
					   void *cookie, bool send_frame)
267 268
{
	struct ieee80211_local *local = sdata->local;
269
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
270 271
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;
272

273
	skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
274
	if (!skb)
275
		return;
276

277 278 279 280
	skb_reserve(skb, local->hw.extra_tx_headroom);

	mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
	memset(mgmt, 0, 24);
281
	memcpy(mgmt->da, bssid, ETH_ALEN);
282
	memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
283
	memcpy(mgmt->bssid, bssid, ETH_ALEN);
284
	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
285
	skb_put(skb, 2);
286
	/* u.deauth.reason_code == u.disassoc.reason_code */
287 288
	mgmt->u.deauth.reason_code = cpu_to_le16(reason);

289
	if (stype == IEEE80211_STYPE_DEAUTH)
290 291 292 293
		if (cookie)
			__cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
		else
			cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
294
	else
295 296 297 298
		if (cookie)
			__cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
		else
			cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
299 300
	if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
		IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
301 302 303 304 305

	if (send_frame)
		ieee80211_tx_skb(sdata, skb);
	else
		kfree_skb(skb);
306 307
}

308 309 310 311 312 313
void ieee80211_send_pspoll(struct ieee80211_local *local,
			   struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_pspoll *pspoll;
	struct sk_buff *skb;

314 315
	skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
	if (!skb)
316 317
		return;

318 319
	pspoll = (struct ieee80211_pspoll *) skb->data;
	pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
320

321 322
	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
	ieee80211_tx_skb(sdata, skb);
323 324
}

325 326 327 328 329
void ieee80211_send_nullfunc(struct ieee80211_local *local,
			     struct ieee80211_sub_if_data *sdata,
			     int powersave)
{
	struct sk_buff *skb;
330
	struct ieee80211_hdr_3addr *nullfunc;
331

332 333
	skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
	if (!skb)
334 335
		return;

336
	nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
337
	if (powersave)
338
		nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
339

340 341
	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
	ieee80211_tx_skb(sdata, skb);
342 343
}

344 345 346 347 348 349 350 351 352 353 354
static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
					  struct ieee80211_sub_if_data *sdata)
{
	struct sk_buff *skb;
	struct ieee80211_hdr *nullfunc;
	__le16 fc;

	if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
		return;

	skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
355
	if (!skb)
356
		return;
357

358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373
	skb_reserve(skb, local->hw.extra_tx_headroom);

	nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
	memset(nullfunc, 0, 30);
	fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
			 IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
	nullfunc->frame_control = fc;
	memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
	memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
	memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
	memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);

	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
	ieee80211_tx_skb(sdata, skb);
}

374 375 376 377 378 379 380
/* spectrum management related things */
static void ieee80211_chswitch_work(struct work_struct *work)
{
	struct ieee80211_sub_if_data *sdata =
		container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

381
	if (!ieee80211_sdata_running(sdata))
382 383
		return;

384 385 386
	mutex_lock(&ifmgd->mtx);
	if (!ifmgd->associated)
		goto out;
387 388

	sdata->local->oper_channel = sdata->local->csa_channel;
389 390 391 392 393
	if (!sdata->local->ops->channel_switch) {
		/* call "hw_config" only if doing sw channel switch */
		ieee80211_hw_config(sdata->local,
			IEEE80211_CONF_CHANGE_CHANNEL);
	}
394

395
	/* XXX: shouldn't really modify cfg80211-owned data! */
396
	ifmgd->associated->channel = sdata->local->oper_channel;
397 398 399

	ieee80211_wake_queues_by_reason(&sdata->local->hw,
					IEEE80211_QUEUE_STOP_REASON_CSA);
400 401 402
 out:
	ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
	mutex_unlock(&ifmgd->mtx);
403 404
}

405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427
void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
{
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_if_managed *ifmgd;

	sdata = vif_to_sdata(vif);
	ifmgd = &sdata->u.mgd;

	trace_api_chswitch_done(sdata, success);
	if (!success) {
		/*
		 * If the channel switch was not successful, stay
		 * around on the old channel. We currently lack
		 * good handling of this situation, possibly we
		 * should just drop the association.
		 */
		sdata->local->csa_channel = sdata->local->oper_channel;
	}

	ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
}
EXPORT_SYMBOL(ieee80211_chswitch_done);

428 429 430 431 432 433
static void ieee80211_chswitch_timer(unsigned long data)
{
	struct ieee80211_sub_if_data *sdata =
		(struct ieee80211_sub_if_data *) data;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

434 435 436 437 438
	if (sdata->local->quiescing) {
		set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
		return;
	}

439
	ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
440 441 442 443
}

void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
				      struct ieee80211_channel_sw_ie *sw_elem,
444 445
				      struct ieee80211_bss *bss,
				      u64 timestamp)
446
{
447 448
	struct cfg80211_bss *cbss =
		container_of((void *)bss, struct cfg80211_bss, priv);
449 450
	struct ieee80211_channel *new_ch;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
451 452
	int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num,
						      cbss->channel->band);
453

454 455 456
	ASSERT_MGD_MTX(ifmgd);

	if (!ifmgd->associated)
457 458
		return;

459
	if (sdata->local->scanning)
460 461 462 463 464 465 466 467 468 469 470 471 472 473
		return;

	/* Disregard subsequent beacons if we are already running a timer
	   processing a CSA */

	if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
		return;

	new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
	if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
		return;

	sdata->local->csa_channel = new_ch;

474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491
	if (sdata->local->ops->channel_switch) {
		/* use driver's channel switch callback */
		struct ieee80211_channel_switch ch_switch;
		memset(&ch_switch, 0, sizeof(ch_switch));
		ch_switch.timestamp = timestamp;
		if (sw_elem->mode) {
			ch_switch.block_tx = true;
			ieee80211_stop_queues_by_reason(&sdata->local->hw,
					IEEE80211_QUEUE_STOP_REASON_CSA);
		}
		ch_switch.channel = new_ch;
		ch_switch.count = sw_elem->count;
		ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
		drv_channel_switch(sdata->local, &ch_switch);
		return;
	}

	/* channel switch handled in software */
492
	if (sw_elem->count <= 1) {
493
		ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
494
	} else {
495 496
		if (sw_elem->mode)
			ieee80211_stop_queues_by_reason(&sdata->local->hw,
497 498 499 500 501
					IEEE80211_QUEUE_STOP_REASON_CSA);
		ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
		mod_timer(&ifmgd->chswitch_timer,
			  jiffies +
			  msecs_to_jiffies(sw_elem->count *
502
					   cbss->beacon_interval));
503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525
	}
}

static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
					u16 capab_info, u8 *pwr_constr_elem,
					u8 pwr_constr_elem_len)
{
	struct ieee80211_conf *conf = &sdata->local->hw.conf;

	if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
		return;

	/* Power constraint IE length should be 1 octet */
	if (pwr_constr_elem_len != 1)
		return;

	if ((*pwr_constr_elem <= conf->channel->max_power) &&
	    (*pwr_constr_elem != sdata->local->power_constr_level)) {
		sdata->local->power_constr_level = *pwr_constr_elem;
		ieee80211_hw_config(sdata->local, 0);
	}
}

526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558
void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_conf *conf = &local->hw.conf;

	WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
		!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
		(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));

	local->disable_dynamic_ps = false;
	conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout;
}
EXPORT_SYMBOL(ieee80211_enable_dyn_ps);

void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_conf *conf = &local->hw.conf;

	WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
		!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
		(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));

	local->disable_dynamic_ps = true;
	conf->dynamic_ps_timeout = 0;
	del_timer_sync(&local->dynamic_ps_timer);
	ieee80211_queue_work(&local->hw,
			     &local->dynamic_ps_enable_work);
}
EXPORT_SYMBOL(ieee80211_disable_dyn_ps);

559 560 561 562 563 564
/* powersave */
static void ieee80211_enable_ps(struct ieee80211_local *local,
				struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_conf *conf = &local->hw.conf;

Johannes Berg's avatar
Johannes Berg committed
565 566 567 568
	/*
	 * If we are scanning right now then the parameters will
	 * take effect when scan finishes.
	 */
569
	if (local->scanning)
Johannes Berg's avatar
Johannes Berg committed
570 571
		return;

572 573 574 575 576 577 578
	if (conf->dynamic_ps_timeout > 0 &&
	    !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
		mod_timer(&local->dynamic_ps_timer, jiffies +
			  msecs_to_jiffies(conf->dynamic_ps_timeout));
	} else {
		if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
			ieee80211_send_nullfunc(local, sdata, 1);
579

580 581 582 583 584 585
		if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
		    (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
			return;

		conf->flags |= IEEE80211_CONF_PS;
		ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602
	}
}

static void ieee80211_change_ps(struct ieee80211_local *local)
{
	struct ieee80211_conf *conf = &local->hw.conf;

	if (local->ps_sdata) {
		ieee80211_enable_ps(local, local->ps_sdata);
	} else if (conf->flags & IEEE80211_CONF_PS) {
		conf->flags &= ~IEEE80211_CONF_PS;
		ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
		del_timer_sync(&local->dynamic_ps_timer);
		cancel_work_sync(&local->dynamic_ps_enable_work);
	}
}

603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633
static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *mgd = &sdata->u.mgd;
	struct sta_info *sta = NULL;
	u32 sta_flags = 0;

	if (!mgd->powersave)
		return false;

	if (!mgd->associated)
		return false;

	if (!mgd->associated->beacon_ies)
		return false;

	if (mgd->flags & (IEEE80211_STA_BEACON_POLL |
			  IEEE80211_STA_CONNECTION_POLL))
		return false;

	rcu_read_lock();
	sta = sta_info_get(sdata, mgd->bssid);
	if (sta)
		sta_flags = get_sta_flags(sta);
	rcu_read_unlock();

	if (!(sta_flags & WLAN_STA_AUTHORIZED))
		return false;

	return true;
}

634
/* need to hold RTNL or interface lock */
635
void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
636 637 638
{
	struct ieee80211_sub_if_data *sdata, *found = NULL;
	int count = 0;
639
	int timeout;
640 641 642 643 644 645

	if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
		local->ps_sdata = NULL;
		return;
	}

646 647 648 649 650
	if (!list_empty(&local->work_list)) {
		local->ps_sdata = NULL;
		goto change;
	}

651
	list_for_each_entry(sdata, &local->interfaces, list) {
652
		if (!ieee80211_sdata_running(sdata))
653
			continue;
654 655 656 657 658 659 660 661
		if (sdata->vif.type == NL80211_IFTYPE_AP) {
			/* If an AP vif is found, then disable PS
			 * by setting the count to zero thereby setting
			 * ps_sdata to NULL.
			 */
			count = 0;
			break;
		}
662 663 664 665 666 667
		if (sdata->vif.type != NL80211_IFTYPE_STATION)
			continue;
		found = sdata;
		count++;
	}

668
	if (count == 1 && ieee80211_powersave_allowed(found)) {
669
		struct ieee80211_conf *conf = &local->hw.conf;
670 671 672
		s32 beaconint_us;

		if (latency < 0)
Mark Gross's avatar
Mark Gross committed
673
			latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
674 675 676 677

		beaconint_us = ieee80211_tu_to_usec(
					found->vif.bss_conf.beacon_int);

678
		timeout = local->dynamic_ps_forced_timeout;
679 680
		if (timeout < 0) {
			/*
681 682
			 * Go to full PSM if the user configures a very low
			 * latency requirement.
683 684 685
			 * The 2000 second value is there for compatibility
			 * until the PM_QOS_NETWORK_LATENCY is configured
			 * with real values.
686
			 */
687 688
			if (latency > (1900 * USEC_PER_MSEC) &&
			    latency != (2000 * USEC_PER_SEC))
689
				timeout = 0;
690 691
			else
				timeout = 100;
692
		}
693 694 695 696
		local->dynamic_ps_user_timeout = timeout;
		if (!local->disable_dynamic_ps)
			conf->dynamic_ps_timeout =
				local->dynamic_ps_user_timeout;
697

698
		if (beaconint_us > latency) {
699
			local->ps_sdata = NULL;
700
		} else {
701
			struct ieee80211_bss *bss;
702
			int maxslp = 1;
703
			u8 dtimper;
704

705 706 707 708 709 710 711
			bss = (void *)found->u.mgd.associated->priv;
			dtimper = bss->dtim_period;

			/* If the TIM IE is invalid, pretend the value is 1 */
			if (!dtimper)
				dtimper = 1;
			else if (dtimper > 1)
712 713 714
				maxslp = min_t(int, dtimper,
						    latency / beaconint_us);

715
			local->hw.conf.max_sleep_period = maxslp;
716
			local->hw.conf.ps_dtim_period = dtimper;
717
			local->ps_sdata = found;
718
		}
719
	} else {
720
		local->ps_sdata = NULL;
721
	}
722

723
 change:
724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747
	ieee80211_change_ps(local);
}

void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
{
	struct ieee80211_local *local =
		container_of(work, struct ieee80211_local,
			     dynamic_ps_disable_work);

	if (local->hw.conf.flags & IEEE80211_CONF_PS) {
		local->hw.conf.flags &= ~IEEE80211_CONF_PS;
		ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
	}

	ieee80211_wake_queues_by_reason(&local->hw,
					IEEE80211_QUEUE_STOP_REASON_PS);
}

void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
{
	struct ieee80211_local *local =
		container_of(work, struct ieee80211_local,
			     dynamic_ps_enable_work);
	struct ieee80211_sub_if_data *sdata = local->ps_sdata;
748
	struct ieee80211_if_managed *ifmgd;
749 750
	unsigned long flags;
	int q;
751 752 753 754 755

	/* can only happen when PS was just disabled anyway */
	if (!sdata)
		return;

756 757
	ifmgd = &sdata->u.mgd;

758 759 760
	if (local->hw.conf.flags & IEEE80211_CONF_PS)
		return;

761 762 763 764
	if (!local->disable_dynamic_ps &&
	    local->hw.conf.dynamic_ps_timeout > 0) {
		/* don't enter PS if TX frames are pending */
		if (drv_tx_frames_pending(local)) {
765 766 767 768 769
			mod_timer(&local->dynamic_ps_timer, jiffies +
				  msecs_to_jiffies(
				  local->hw.conf.dynamic_ps_timeout));
			return;
		}
770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787

		/*
		 * transmission can be stopped by others which leads to
		 * dynamic_ps_timer expiry. Postpone the ps timer if it
		 * is not the actual idle state.
		 */
		spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
		for (q = 0; q < local->hw.queues; q++) {
			if (local->queue_stop_reasons[q]) {
				spin_unlock_irqrestore(&local->queue_stop_reason_lock,
						       flags);
				mod_timer(&local->dynamic_ps_timer, jiffies +
					  msecs_to_jiffies(
					  local->hw.conf.dynamic_ps_timeout));
				return;
			}
		}
		spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
788 789
	}

790
	if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
791 792
	    (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED))) {
		netif_tx_stop_all_queues(sdata->dev);
793

794 795 796 797 798 799 800 801 802
		if (drv_tx_frames_pending(local))
			mod_timer(&local->dynamic_ps_timer, jiffies +
				  msecs_to_jiffies(
				  local->hw.conf.dynamic_ps_timeout));
		else {
			ieee80211_send_nullfunc(local, sdata, 1);
			/* Flush to get the tx status of nullfunc frame */
			drv_flush(local, false);
		}
803 804
	}

805 806
	if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
	      (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
807 808 809 810 811
	    (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
		ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
		local->hw.conf.flags |= IEEE80211_CONF_PS;
		ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
	}
812

813 814
	if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
		netif_tx_wake_all_queues(sdata->dev);
815 816 817 818 819 820
}

void ieee80211_dynamic_ps_timer(unsigned long data)
{
	struct ieee80211_local *local = (void *) data;

821
	if (local->quiescing || local->suspended)
822 823
		return;

824
	ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
825 826
}

Johannes Berg's avatar
Johannes Berg committed
827
/* MLME */
828
static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
829
				     struct ieee80211_sub_if_data *sdata,
830 831 832
				     u8 *wmm_param, size_t wmm_param_len)
{
	struct ieee80211_tx_queue_params params;
833
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
834 835
	size_t left;
	int count;
836
	u8 *pos, uapsd_queues = 0;
837

838 839 840
	if (!local->ops->conf_tx)
		return;

841
	if (local->hw.queues < 4)
842 843 844 845 846
		return;

	if (!wmm_param)
		return;

847 848
	if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
		return;
849 850

	if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
851
		uapsd_queues = local->uapsd_queues;
852

853
	count = wmm_param[6] & 0x0f;
854
	if (count == ifmgd->wmm_last_param_set)
855
		return;
856
	ifmgd->wmm_last_param_set = count;
857 858 859 860 861 862 863 864 865 866

	pos = wmm_param + 8;
	left = wmm_param_len - 8;

	memset(&params, 0, sizeof(params));

	local->wmm_acm = 0;
	for (; left >= 4; left -= 4, pos += 4) {
		int aci = (pos[0] >> 5) & 0x03;
		int acm = (pos[0] >> 4) & 0x01;
867
		bool uapsd = false;
868 869 870
		int queue;

		switch (aci) {
871
		case 1: /* AC_BK */
Johannes Berg's avatar
Johannes Berg committed
872
			queue = 3;
Johannes Berg's avatar
Johannes Berg committed
873
			if (acm)
874
				local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
875 876
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
				uapsd = true;
877
			break;
878
		case 2: /* AC_VI */
Johannes Berg's avatar
Johannes Berg committed
879
			queue = 1;
Johannes Berg's avatar
Johannes Berg committed
880
			if (acm)
881
				local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
882 883
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
				uapsd = true;
884
			break;
885
		case 3: /* AC_VO */
Johannes Berg's avatar
Johannes Berg committed
886
			queue = 0;
Johannes Berg's avatar
Johannes Berg committed
887
			if (acm)
888
				local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
889 890
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
				uapsd = true;
891
			break;
892
		case 0: /* AC_BE */
893
		default:
Johannes Berg's avatar
Johannes Berg committed
894
			queue = 2;
Johannes Berg's avatar
Johannes Berg committed
895
			if (acm)
896
				local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
897 898
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
				uapsd = true;
899 900 901 902 903 904
			break;
		}

		params.aifs = pos[0] & 0x0f;
		params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
		params.cw_min = ecw2cw(pos[1] & 0x0f);
905
		params.txop = get_unaligned_le16(pos + 2);
906 907
		params.uapsd = uapsd;

908
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
Joe Perches's avatar
Joe Perches committed
909 910 911 912 913 914
		wiphy_debug(local->hw.wiphy,
			    "WMM queue=%d aci=%d acm=%d aifs=%d "
			    "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
			    queue, aci, acm,
			    params.aifs, params.cw_min, params.cw_max,
			    params.txop, params.uapsd);
915
#endif
916
		local->tx_conf[queue] = params;
917
		if (drv_conf_tx(local, queue, &params))
Joe Perches's avatar
Joe Perches committed
918 919 920
			wiphy_debug(local->hw.wiphy,
				    "failed to set TX queue parameters for queue %d\n",
				    queue);
921
	}
922 923

	/* enable WMM or activate new settings */
924 925
	sdata->vif.bss_conf.qos = true;
	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
926 927
}

928 929
static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
					   u16 capab, bool erp_valid, u8 erp)
930
{
931
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
932
	u32 changed = 0;
933 934 935 936 937 938 939 940 941 942 943 944 945
	bool use_protection;
	bool use_short_preamble;
	bool use_short_slot;

	if (erp_valid) {
		use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
		use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
	} else {
		use_protection = false;
		use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
	}

	use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
946 947
	if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
		use_short_slot = true;
948

949 950 951
	if (use_protection != bss_conf->use_cts_prot) {
		bss_conf->use_cts_prot = use_protection;
		changed |= BSS_CHANGED_ERP_CTS_PROT;
952
	}
953

954 955
	if (use_short_preamble != bss_conf->use_short_preamble) {
		bss_conf->use_short_preamble = use_short_preamble;
956
		changed |= BSS_CHANGED_ERP_PREAMBLE;
957
	}
958

959 960 961
	if (use_short_slot != bss_conf->use_short_slot) {
		bss_conf->use_short_slot = use_short_slot;
		changed |= BSS_CHANGED_ERP_SLOT;
962 963 964 965 966
	}

	return changed;
}

967
static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
968
				     struct cfg80211_bss *cbss,
Johannes Berg's avatar
Johannes Berg committed
969
				     u32 bss_info_changed)
970
{
971
	struct ieee80211_bss *bss = (void *)cbss->priv;
972
	struct ieee80211_local *local = sdata->local;
973
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
974

Johannes Berg's avatar
Johannes Berg committed
975
	bss_info_changed |= BSS_CHANGED_ASSOC;
976
	/* set timing information */
977 978
	bss_conf->beacon_int = cbss->beacon_interval;
	bss_conf->timestamp = cbss->tsf;
979

980 981
	bss_info_changed |= BSS_CHANGED_BEACON_INT;
	bss_info_changed |= ieee80211_handle_bss_capability(sdata,
982
		cbss->capability, bss->has_erp_value, bss->erp_value);
983

984 985 986
	sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
		IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int));

987 988
	sdata->u.mgd.associated = cbss;
	memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
989

990 991
	sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;

992 993 994 995
	/* just to be sure */
	sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
				IEEE80211_STA_BEACON_POLL);

996
	ieee80211_led_assoc(local, 1);
997

998 999 1000 1001 1002
	if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
		bss_conf->dtim_period = bss->dtim_period;
	else
		bss_conf->dtim_period = 0;

1003
	bss_conf->assoc = 1;
1004 1005 1006 1007 1008
	/*
	 * For now just always ask the driver to update the basic rateset
	 * when we have associated, we aren't checking whether it actually
	 * changed or not.
	 */
Johannes Berg's avatar
Johannes Berg committed
1009
	bss_info_changed |= BSS_CHANGED_BASIC_RATES;
1010 1011 1012 1013

	/* And the BSSID changed - we're associated now */
	bss_info_changed |= BSS_CHANGED_BSSID;

1014 1015
	/* Tell the driver to monitor connection quality (if supported) */
	if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) &&
1016
	    bss_conf->cqm_rssi_thold)
1017 1018
		bss_info_changed |= BSS_CHANGED_CQM;

1019 1020 1021 1022 1023 1024
	/* Enable ARP filtering */
	if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
		bss_conf->arp_filter_enabled = sdata->arp_filter_state;
		bss_info_changed |= BSS_CHANGED_ARP_FILTER;
	}

Johannes Berg's avatar
Johannes Berg committed
1025
	ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1026

Johannes Berg's avatar
Johannes Berg committed
1027 1028
	mutex_lock(&local->iflist_mtx);
	ieee80211_recalc_ps(local, -1);
1029
	ieee80211_recalc_smps(local);
Johannes Berg's avatar
Johannes Berg committed
1030
	mutex_unlock(&local->iflist_mtx);
1031

1032
	netif_tx_start_all_queues(sdata->dev);
1033
	netif_carrier_on(sdata->dev);
1034 1035
}

1036
static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1037
				   bool remove_sta, bool tx)
1038
{
1039
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1040 1041
	struct ieee80211_local *local = sdata->local;
	struct sta_info *sta;
1042
	u32 changed = 0, config_changed = 0;
1043
	u8 bssid[ETH_ALEN];
1044

1045 1046
	ASSERT_MGD_MTX(ifmgd);

1047 1048 1049
	if (WARN_ON(!ifmgd->associated))
		return;

1050
	memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1051

1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067
	ifmgd->associated = NULL;
	memset(ifmgd->bssid, 0, ETH_ALEN);

	/*
	 * we need to commit the associated = NULL change because the
	 * scan code uses that to determine whether this iface should
	 * go to/wake up from powersave or not -- and could otherwise
	 * wake the queues erroneously.
	 */
	smp_mb();

	/*
	 * Thus, we can only afterwards stop the queues -- to account
	 * for the case where another CPU is finishing a scan at this
	 * time -- we don't want the scan code to enable queues.
	 */
1068

1069
	netif_tx_stop_all_queues(sdata->dev);
1070 1071
	netif_carrier_off(sdata->dev);

1072
	mutex_lock(&local->sta_mtx);
1073
	sta = sta_info_get(sdata, bssid);
1074
	if (sta) {
1075
		set_sta_flags(sta, WLAN_STA_BLOCK_BA);
1076
		ieee80211_sta_tear_down_BA_sessions(sta, tx);
1077
	}
1078
	mutex_unlock(&local->sta_mtx);
1079

1080 1081 1082
	changed |= ieee80211_reset_erp_info(sdata);

	ieee80211_led_assoc(local, 0);
Johannes Berg's avatar
Johannes Berg committed
1083 1084
	changed |= BSS_CHANGED_ASSOC;
	sdata->vif.bss_conf.assoc = false;
1085

1086 1087
	ieee80211_set_wmm_default(sdata);

1088
	/* channel(_type) changes are handled by ieee80211_hw_config */
1089
	WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
1090

1091 1092 1093
	/* on the next assoc, re-program HT parameters */
	sdata->ht_opmode_valid = false;

1094 1095
	local->power_constr_level = 0;

1096 1097 1098
	del_timer_sync(&local->dynamic_ps_timer);
	cancel_work_sync(&local->dynamic_ps_enable_work);

1099 1100 1101 1102
	if (local->hw.conf.flags & IEEE80211_CONF_PS) {
		local->hw.conf.flags &= ~IEEE80211_CONF_PS;
		config_changed |= IEEE80211_CONF_CHANGE_PS;
	}
1103
	local->ps_sdata = NULL;
Johannes Berg's avatar
Johannes Berg committed
1104

1105
	ieee80211_hw_config(local, config_changed);
1106

1107 1108 1109 1110 1111 1112
	/* Disable ARP filtering */
	if (sdata->vif.bss_conf.arp_filter_enabled) {
		sdata->vif.bss_conf.arp_filter_enabled = false;
		changed |= BSS_CHANGED_ARP_FILTER;
	}

1113 1114
	/* The BSSID (not really interesting) and HT changed */
	changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
Johannes Berg's avatar
Johannes Berg committed
1115
	ieee80211_bss_info_change_notify(sdata, changed);
1116

1117 1118
	if (remove_sta)
		sta_info_destroy_addr(sdata, bssid);
1119 1120 1121 1122 1123

	del_timer_sync(&sdata->u.mgd.conn_mon_timer);
	del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
	del_timer_sync(&sdata->u.mgd.timer);
	del_timer_sync(&sdata->u.mgd.chswitch_timer);
1124
}
1125

1126 1127 1128 1129 1130 1131 1132 1133
void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
			     struct ieee80211_hdr *hdr)
{
	/*
	 * We can postpone the mgd.timer whenever receiving unicast frames
	 * from AP because we know that the connection is working both ways
	 * at that time. But multicast frames (and hence also beacons) must
	 * be ignored here, because we need to trigger the timer during
1134 1135
	 * data idle periods for sending the periodic probe request to the
	 * AP we're connected to.
1136
	 */
1137 1138 1139
	if (is_multicast_ether_addr(hdr->addr1))
		return;

1140
	ieee80211_sta_reset_conn_monitor(sdata);
1141
}
1142

1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172
static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

	if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
			      IEEE80211_STA_CONNECTION_POLL)))
	    return;

	ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
			  IEEE80211_STA_BEACON_POLL);
	mutex_lock(&sdata->local->iflist_mtx);
	ieee80211_recalc_ps(sdata->local, -1);
	mutex_unlock(&sdata->local->iflist_mtx);

	if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
		return;

	/*
	 * We've received a probe response, but are not sure whether
	 * we have or will be receiving any beacons or data, so let's
	 * schedule the timers again, just in case.
	 */
	ieee80211_sta_reset_beacon_monitor(sdata);

	mod_timer(&ifmgd->conn_mon_timer,
		  round_jiffies_up(jiffies +
				   IEEE80211_CONNECTION_IDLE_TIME));
}

void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1173
			     struct ieee80211_hdr *hdr, bool ack)
1174
{
1175
	if (!ieee80211_is_data(hdr->frame_control))
1176 1177
	    return;

1178 1179
	if (ack)
		ieee80211_sta_reset_conn_monitor(sdata);
1180 1181 1182

	if (ieee80211_is_nullfunc(hdr->frame_control) &&
	    sdata->u.mgd.probe_send_count > 0) {
1183 1184 1185