mlme.c 77.4 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.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,
163 164
			       const u8 *bssid, u16 ap_ht_cap_flags,
			       bool beacon_htcap_ie)
165 166 167 168 169
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_supported_band *sband;
	struct sta_info *sta;
	u32 changed = 0;
170
	int hti_cfreq;
171
	u16 ht_opmode;
172 173
	bool enable_ht = true;
	enum nl80211_channel_type prev_chantype;
174 175 176 177
	enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;

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

178 179
	prev_chantype = sdata->vif.bss_conf.channel_type;

180 181 182 183
	/* HT is not supported */
	if (!sband->ht_cap.ht_supported)
		enable_ht = false;

184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204
	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;
		}
	}
205 206 207 208 209 210 211 212 213

	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:
214 215 216
				if (!(local->hw.conf.channel->flags &
				    IEEE80211_CHAN_NO_HT40PLUS))
					channel_type = NL80211_CHAN_HT40PLUS;
217 218
				break;
			case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
219 220 221
				if (!(local->hw.conf.channel->flags &
				    IEEE80211_CHAN_NO_HT40MINUS))
					channel_type = NL80211_CHAN_HT40MINUS;
222 223 224 225 226
				break;
			}
		}
	}

227 228
	if (local->tmp_channel)
		local->tmp_channel_type = channel_type;
229

230 231 232 233 234
	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));
	}
235

236 237 238 239 240 241 242 243 244 245 246 247 248 249 250
	if (beacon_htcap_ie && (prev_chantype != channel_type)) {
		/*
		 * Whenever the AP announces the HT mode change that can be
		 * 40MHz intolerant or etc., it would be safer to stop tx
		 * queues before doing hw config to avoid buffer overflow.
		 */
		ieee80211_stop_queues_by_reason(&sdata->local->hw,
				IEEE80211_QUEUE_STOP_REASON_CHTYPE_CHANGE);

		/* flush out all packets */
		synchronize_net();

		drv_flush(local, false);
	}

251 252
	/* channel_type change automatically detected */
	ieee80211_hw_config(local, 0);
253

254
	if (prev_chantype != channel_type) {
255
		rcu_read_lock();
256
		sta = sta_info_get(sdata, bssid);
257 258
		if (sta)
			rate_control_rate_update(local, sband, sta,
259
						 IEEE80211_RC_HT_CHANGED,
260
						 channel_type);
261
		rcu_read_unlock();
262 263 264 265

		if (beacon_htcap_ie)
			ieee80211_wake_queues_by_reason(&sdata->local->hw,
				IEEE80211_QUEUE_STOP_REASON_CHTYPE_CHANGE);
266
	}
267

268
	ht_opmode = le16_to_cpu(hti->operation_mode);
269 270

	/* if bss configuration changed store the new one */
271 272 273
	if (sdata->ht_opmode_valid != enable_ht ||
	    sdata->vif.bss_conf.ht_operation_mode != ht_opmode ||
	    prev_chantype != channel_type) {
274
		changed |= BSS_CHANGED_HT;
275
		sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
276
		sdata->ht_opmode_valid = enable_ht;
277 278 279 280 281
	}

	return changed;
}

282 283
/* frame sending functions */

284
static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
Johannes Berg's avatar
Johannes Berg committed
285
					   const u8 *bssid, u16 stype, u16 reason,
286
					   void *cookie, bool send_frame)
287 288
{
	struct ieee80211_local *local = sdata->local;
289
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
290 291
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;
292

293
	skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
294
	if (!skb)
295
		return;
296

297 298 299 300
	skb_reserve(skb, local->hw.extra_tx_headroom);

	mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
	memset(mgmt, 0, 24);
301
	memcpy(mgmt->da, bssid, ETH_ALEN);
302
	memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
303
	memcpy(mgmt->bssid, bssid, ETH_ALEN);
304
	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
305
	skb_put(skb, 2);
306
	/* u.deauth.reason_code == u.disassoc.reason_code */
307 308
	mgmt->u.deauth.reason_code = cpu_to_le16(reason);

309
	if (stype == IEEE80211_STYPE_DEAUTH)
310 311 312 313
		if (cookie)
			__cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
		else
			cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
314
	else
315 316 317 318
		if (cookie)
			__cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
		else
			cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
319 320
	if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
		IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
321 322 323 324 325

	if (send_frame)
		ieee80211_tx_skb(sdata, skb);
	else
		kfree_skb(skb);
326 327
}

328 329 330 331 332 333
void ieee80211_send_pspoll(struct ieee80211_local *local,
			   struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_pspoll *pspoll;
	struct sk_buff *skb;

334 335
	skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
	if (!skb)
336 337
		return;

338 339
	pspoll = (struct ieee80211_pspoll *) skb->data;
	pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
340

341 342
	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
	ieee80211_tx_skb(sdata, skb);
343 344
}

345 346 347 348 349
void ieee80211_send_nullfunc(struct ieee80211_local *local,
			     struct ieee80211_sub_if_data *sdata,
			     int powersave)
{
	struct sk_buff *skb;
350
	struct ieee80211_hdr_3addr *nullfunc;
351
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
352

353 354
	skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
	if (!skb)
355 356
		return;

357
	nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
358
	if (powersave)
359
		nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
360

361
	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
362 363 364 365
	if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
			    IEEE80211_STA_CONNECTION_POLL))
		IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;

366
	ieee80211_tx_skb(sdata, skb);
367 368
}

369 370 371 372 373 374 375 376 377 378 379
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);
380
	if (!skb)
381
		return;
382

383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398
	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);
}

399 400 401 402 403 404 405
/* 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;

406
	if (!ieee80211_sdata_running(sdata))
407 408
		return;

409 410 411
	mutex_lock(&ifmgd->mtx);
	if (!ifmgd->associated)
		goto out;
412 413

	sdata->local->oper_channel = sdata->local->csa_channel;
414 415 416 417
	if (!sdata->local->ops->channel_switch) {
		/* call "hw_config" only if doing sw channel switch */
		ieee80211_hw_config(sdata->local,
			IEEE80211_CONF_CHANGE_CHANNEL);
418 419 420
	} else {
		/* update the device channel directly */
		sdata->local->hw.conf.channel = sdata->local->oper_channel;
421
	}
422

423
	/* XXX: shouldn't really modify cfg80211-owned data! */
424
	ifmgd->associated->channel = sdata->local->oper_channel;
425 426 427

	ieee80211_wake_queues_by_reason(&sdata->local->hw,
					IEEE80211_QUEUE_STOP_REASON_CSA);
428 429 430
 out:
	ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
	mutex_unlock(&ifmgd->mtx);
431 432
}

433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455
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);

456 457 458 459 460 461
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;

462 463 464 465 466
	if (sdata->local->quiescing) {
		set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
		return;
	}

467
	ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
468 469 470 471
}

void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
				      struct ieee80211_channel_sw_ie *sw_elem,
472 473
				      struct ieee80211_bss *bss,
				      u64 timestamp)
474
{
475 476
	struct cfg80211_bss *cbss =
		container_of((void *)bss, struct cfg80211_bss, priv);
477 478
	struct ieee80211_channel *new_ch;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
479 480
	int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num,
						      cbss->channel->band);
481

482 483 484
	ASSERT_MGD_MTX(ifmgd);

	if (!ifmgd->associated)
485 486
		return;

487
	if (sdata->local->scanning)
488 489 490 491 492 493 494 495 496 497 498 499 500 501
		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;

502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519
	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 */
520
	if (sw_elem->count <= 1) {
521
		ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
522
	} else {
523 524
		if (sw_elem->mode)
			ieee80211_stop_queues_by_reason(&sdata->local->hw,
525 526 527 528 529
					IEEE80211_QUEUE_STOP_REASON_CSA);
		ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
		mod_timer(&ifmgd->chswitch_timer,
			  jiffies +
			  msecs_to_jiffies(sw_elem->count *
530
					   cbss->beacon_interval));
531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553
	}
}

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);
	}
}

554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586
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);

587 588 589 590 591 592
/* 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
593 594 595 596
	/*
	 * If we are scanning right now then the parameters will
	 * take effect when scan finishes.
	 */
597
	if (local->scanning)
Johannes Berg's avatar
Johannes Berg committed
598 599
		return;

600 601 602 603 604 605 606
	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);
607

608 609 610 611 612 613
		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);
614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630
	}
}

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);
	}
}

631 632 633 634
static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *mgd = &sdata->u.mgd;
	struct sta_info *sta = NULL;
635
	bool authorized = false;
636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652

	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)
653
		authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
654 655
	rcu_read_unlock();

656
	return authorized;
657 658
}

659
/* need to hold RTNL or interface lock */
660
void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
661 662 663
{
	struct ieee80211_sub_if_data *sdata, *found = NULL;
	int count = 0;
664
	int timeout;
665 666 667 668 669 670

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

671 672 673 674 675
	if (!list_empty(&local->work_list)) {
		local->ps_sdata = NULL;
		goto change;
	}

676
	list_for_each_entry(sdata, &local->interfaces, list) {
677
		if (!ieee80211_sdata_running(sdata))
678
			continue;
679 680 681 682 683 684 685 686
		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;
		}
687 688 689 690 691 692
		if (sdata->vif.type != NL80211_IFTYPE_STATION)
			continue;
		found = sdata;
		count++;
	}

693
	if (count == 1 && ieee80211_powersave_allowed(found)) {
694
		struct ieee80211_conf *conf = &local->hw.conf;
695 696 697
		s32 beaconint_us;

		if (latency < 0)
Mark Gross's avatar
Mark Gross committed
698
			latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
699 700 701 702

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

703
		timeout = local->dynamic_ps_forced_timeout;
704 705
		if (timeout < 0) {
			/*
706 707
			 * Go to full PSM if the user configures a very low
			 * latency requirement.
708 709 710
			 * The 2000 second value is there for compatibility
			 * until the PM_QOS_NETWORK_LATENCY is configured
			 * with real values.
711
			 */
712 713
			if (latency > (1900 * USEC_PER_MSEC) &&
			    latency != (2000 * USEC_PER_SEC))
714
				timeout = 0;
715 716
			else
				timeout = 100;
717
		}
718 719 720 721
		local->dynamic_ps_user_timeout = timeout;
		if (!local->disable_dynamic_ps)
			conf->dynamic_ps_timeout =
				local->dynamic_ps_user_timeout;
722

723
		if (beaconint_us > latency) {
724
			local->ps_sdata = NULL;
725
		} else {
726
			struct ieee80211_bss *bss;
727
			int maxslp = 1;
728
			u8 dtimper;
729

730 731 732 733 734 735 736
			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)
737 738 739
				maxslp = min_t(int, dtimper,
						    latency / beaconint_us);

740
			local->hw.conf.max_sleep_period = maxslp;
741
			local->hw.conf.ps_dtim_period = dtimper;
742
			local->ps_sdata = found;
743
		}
744
	} else {
745
		local->ps_sdata = NULL;
746
	}
747

748
 change:
749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772
	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;
773
	struct ieee80211_if_managed *ifmgd;
774 775
	unsigned long flags;
	int q;
776 777 778 779 780

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

781 782
	ifmgd = &sdata->u.mgd;

783 784 785
	if (local->hw.conf.flags & IEEE80211_CONF_PS)
		return;

786 787 788 789
	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)) {
790 791 792 793 794
			mod_timer(&local->dynamic_ps_timer, jiffies +
				  msecs_to_jiffies(
				  local->hw.conf.dynamic_ps_timeout));
			return;
		}
795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812

		/*
		 * 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);
813 814
	}

815
	if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
816 817
	    (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED))) {
		netif_tx_stop_all_queues(sdata->dev);
818

819 820 821 822 823 824 825 826 827
		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);
		}
828 829
	}

830 831
	if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
	      (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
832 833 834 835 836
	    (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);
	}
837

838 839
	if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
		netif_tx_wake_all_queues(sdata->dev);
840 841 842 843 844 845
}

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

846
	if (local->quiescing || local->suspended)
847 848
		return;

849
	ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
850 851
}

Johannes Berg's avatar
Johannes Berg committed
852
/* MLME */
853
static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
854
				     struct ieee80211_sub_if_data *sdata,
855 856 857
				     u8 *wmm_param, size_t wmm_param_len)
{
	struct ieee80211_tx_queue_params params;
858
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
859 860
	size_t left;
	int count;
861
	u8 *pos, uapsd_queues = 0;
862

863 864 865
	if (!local->ops->conf_tx)
		return;

866
	if (local->hw.queues < 4)
867 868 869 870 871
		return;

	if (!wmm_param)
		return;

872 873
	if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
		return;
874 875

	if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
876
		uapsd_queues = local->uapsd_queues;
877

878
	count = wmm_param[6] & 0x0f;
879
	if (count == ifmgd->wmm_last_param_set)
880
		return;
881
	ifmgd->wmm_last_param_set = count;
882 883 884 885 886 887 888 889 890 891

	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;
892
		bool uapsd = false;
893 894 895
		int queue;

		switch (aci) {
896
		case 1: /* AC_BK */
Johannes Berg's avatar
Johannes Berg committed
897
			queue = 3;
Johannes Berg's avatar
Johannes Berg committed
898
			if (acm)
899
				local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
900 901
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
				uapsd = true;
902
			break;
903
		case 2: /* AC_VI */
Johannes Berg's avatar
Johannes Berg committed
904
			queue = 1;
Johannes Berg's avatar
Johannes Berg committed
905
			if (acm)
906
				local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
907 908
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
				uapsd = true;
909
			break;
910
		case 3: /* AC_VO */
Johannes Berg's avatar
Johannes Berg committed
911
			queue = 0;
Johannes Berg's avatar
Johannes Berg committed
912
			if (acm)
913
				local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
914 915
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
				uapsd = true;
916
			break;
917
		case 0: /* AC_BE */
918
		default:
Johannes Berg's avatar
Johannes Berg committed
919
			queue = 2;
Johannes Berg's avatar
Johannes Berg committed
920
			if (acm)
921
				local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
922 923
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
				uapsd = true;
924 925 926 927 928 929
			break;
		}

		params.aifs = pos[0] & 0x0f;
		params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
		params.cw_min = ecw2cw(pos[1] & 0x0f);
930
		params.txop = get_unaligned_le16(pos + 2);
931 932
		params.uapsd = uapsd;

933
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
Joe Perches's avatar
Joe Perches committed
934 935 936 937 938 939
		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);
940
#endif
941 942
		sdata->tx_conf[queue] = params;
		if (drv_conf_tx(local, sdata, queue, &params))
Joe Perches's avatar
Joe Perches committed
943 944 945
			wiphy_debug(local->hw.wiphy,
				    "failed to set TX queue parameters for queue %d\n",
				    queue);
946
	}
947 948

	/* enable WMM or activate new settings */
949 950
	sdata->vif.bss_conf.qos = true;
	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
951 952
}

953 954
static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
					   u16 capab, bool erp_valid, u8 erp)
955
{
956
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
957
	u32 changed = 0;
958 959 960 961 962 963 964 965 966 967 968 969 970
	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);
971 972
	if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
		use_short_slot = true;
973

974 975 976
	if (use_protection != bss_conf->use_cts_prot) {
		bss_conf->use_cts_prot = use_protection;
		changed |= BSS_CHANGED_ERP_CTS_PROT;
977
	}
978

979 980
	if (use_short_preamble != bss_conf->use_short_preamble) {
		bss_conf->use_short_preamble = use_short_preamble;
981
		changed |= BSS_CHANGED_ERP_PREAMBLE;
982
	}
983

984 985 986
	if (use_short_slot != bss_conf->use_short_slot) {
		bss_conf->use_short_slot = use_short_slot;
		changed |= BSS_CHANGED_ERP_SLOT;
987 988 989 990 991
	}

	return changed;
}

992
static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
993
				     struct cfg80211_bss *cbss,
Johannes Berg's avatar
Johannes Berg committed
994
				     u32 bss_info_changed)
995
{
996
	struct ieee80211_bss *bss = (void *)cbss->priv;
997
	struct ieee80211_local *local = sdata->local;
998
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
999

Johannes Berg's avatar
Johannes Berg committed
1000
	bss_info_changed |= BSS_CHANGED_ASSOC;
1001
	/* set timing information */
1002 1003
	bss_conf->beacon_int = cbss->beacon_interval;
	bss_conf->timestamp = cbss->tsf;
1004

1005 1006
	bss_info_changed |= BSS_CHANGED_BEACON_INT;
	bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1007
		cbss->capability, bss->has_erp_value, bss->erp_value);
1008

1009 1010 1011
	sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
		IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int));

1012 1013
	sdata->u.mgd.associated = cbss;
	memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1014

1015 1016
	sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;

1017 1018 1019 1020
	/* just to be sure */
	sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
				IEEE80211_STA_BEACON_POLL);

1021
	ieee80211_led_assoc(local, 1);
1022

1023 1024 1025 1026 1027
	if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
		bss_conf->dtim_period = bss->dtim_period;
	else
		bss_conf->dtim_period = 0;

1028
	bss_conf->assoc = 1;
1029 1030 1031 1032 1033
	/*
	 * 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
1034
	bss_info_changed |= BSS_CHANGED_BASIC_RATES;
1035 1036 1037 1038

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

1039 1040
	/* Tell the driver to monitor connection quality (if supported) */
	if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) &&
1041
	    bss_conf->cqm_rssi_thold)
1042 1043
		bss_info_changed |= BSS_CHANGED_CQM;

1044 1045 1046 1047 1048 1049
	/* 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
1050
	ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1051

Johannes Berg's avatar
Johannes Berg committed
1052 1053
	mutex_lock(&local->iflist_mtx);
	ieee80211_recalc_ps(local, -1);
1054
	ieee80211_recalc_smps(local);
Johannes Berg's avatar
Johannes Berg committed
1055
	mutex_unlock(&local->iflist_mtx);
1056

1057
	netif_tx_start_all_queues(sdata->dev);
1058
	netif_carrier_on(sdata->dev);