mlme.c 66.2 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
#define IEEE80211_MAX_PROBE_TRIES 5
32 33 34 35 36 37 38 39 40 41

/*
 * beacon loss detection timeout
 * XXX: should depend on beacon interval
 */
#define IEEE80211_BEACON_LOSS_TIME	(2 * HZ)
/*
 * Time the connection can be idle before we probe
 * it to see if we can still talk to the AP.
 */
42
#define IEEE80211_CONNECTION_IDLE_TIME	(30 * HZ)
43 44 45 46 47
/*
 * Time we wait for a probe response after sending
 * a probe request because of beacon loss or for
 * checking the connection still works.
 */
48
#define IEEE80211_PROBE_WAIT		(HZ / 2)
49

50 51 52 53 54 55 56
/*
 * 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

57 58 59 60 61 62
/*
 * 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

63 64 65
#define TMR_RUNNING_TIMER	0
#define TMR_RUNNING_CHANSW	1

66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87
/*
 * 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_rx_auth() */
	RX_MGMT_CFG80211_AUTH,

	/* caller must call cfg80211_send_rx_assoc() */
	RX_MGMT_CFG80211_ASSOC,

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

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

88 89
	/* caller must tell cfg80211 about internal error */
	RX_MGMT_CFG80211_ASSOC_ERROR,
90 91
};

92
/* utils */
93 94
static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
{
95
	lockdep_assert_held(&ifmgd->mtx);
96 97
}

Johannes Berg's avatar
Johannes Berg committed
98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117
/*
 * 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);
}

118 119 120 121 122 123 124 125 126
static void mod_beacon_timer(struct ieee80211_sub_if_data *sdata)
{
	if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
		return;

	mod_timer(&sdata->u.mgd.bcn_mon_timer,
		  round_jiffies_up(jiffies + IEEE80211_BEACON_LOSS_TIME));
}

127
static int ecw2cw(int ecw)
Johannes Berg's avatar
Johannes Berg committed
128
{
129
	return (1 << ecw) - 1;
Johannes Berg's avatar
Johannes Berg committed
130 131
}

132 133 134 135 136 137 138
/*
 * 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,
139
			       const u8 *bssid, u16 ap_ht_cap_flags)
140 141 142 143 144
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_supported_band *sband;
	struct sta_info *sta;
	u32 changed = 0;
145
	u16 ht_opmode;
146 147
	bool enable_ht = true;
	enum nl80211_channel_type prev_chantype;
148 149 150 151
	enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;

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

152 153
	prev_chantype = sdata->vif.bss_conf.channel_type;

154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170
	/* HT is not supported */
	if (!sband->ht_cap.ht_supported)
		enable_ht = false;

	/* check that channel matches the right operating channel */
	if (local->hw.conf.channel->center_freq !=
	    ieee80211_channel_to_frequency(hti->control_chan))
		enable_ht = false;

	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:
171 172 173
				if (!(local->hw.conf.channel->flags &
				    IEEE80211_CHAN_NO_HT40PLUS))
					channel_type = NL80211_CHAN_HT40PLUS;
174 175
				break;
			case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
176 177 178
				if (!(local->hw.conf.channel->flags &
				    IEEE80211_CHAN_NO_HT40MINUS))
					channel_type = NL80211_CHAN_HT40MINUS;
179 180 181 182 183
				break;
			}
		}
	}

184 185
	if (local->tmp_channel)
		local->tmp_channel_type = channel_type;
186

187 188 189 190 191
	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));
	}
192

193 194
	/* channel_type change automatically detected */
	ieee80211_hw_config(local, 0);
195

196
	if (prev_chantype != channel_type) {
197
		rcu_read_lock();
198
		sta = sta_info_get(sdata, bssid);
199 200
		if (sta)
			rate_control_rate_update(local, sband, sta,
201
						 IEEE80211_RC_HT_CHANGED,
202
						 channel_type);
203
		rcu_read_unlock();
204
	}
205

206
	ht_opmode = le16_to_cpu(hti->operation_mode);
207 208

	/* if bss configuration changed store the new one */
209 210 211
	if (sdata->ht_opmode_valid != enable_ht ||
	    sdata->vif.bss_conf.ht_operation_mode != ht_opmode ||
	    prev_chantype != channel_type) {
212
		changed |= BSS_CHANGED_HT;
213
		sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
214
		sdata->ht_opmode_valid = enable_ht;
215 216 217 218 219
	}

	return changed;
}

220 221
/* frame sending functions */

222
static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
Johannes Berg's avatar
Johannes Berg committed
223
					   const u8 *bssid, u16 stype, u16 reason,
224
					   void *cookie, bool send_frame)
225 226
{
	struct ieee80211_local *local = sdata->local;
227
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
228 229
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;
230

231
	skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
232
	if (!skb) {
233
		printk(KERN_DEBUG "%s: failed to allocate buffer for "
234
		       "deauth/disassoc frame\n", sdata->name);
235 236 237 238 239 240
		return;
	}
	skb_reserve(skb, local->hw.extra_tx_headroom);

	mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
	memset(mgmt, 0, 24);
241
	memcpy(mgmt->da, bssid, ETH_ALEN);
242
	memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
243
	memcpy(mgmt->bssid, bssid, ETH_ALEN);
244
	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
245
	skb_put(skb, 2);
246
	/* u.deauth.reason_code == u.disassoc.reason_code */
247 248
	mgmt->u.deauth.reason_code = cpu_to_le16(reason);

249
	if (stype == IEEE80211_STYPE_DEAUTH)
250 251 252 253
		if (cookie)
			__cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
		else
			cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
254
	else
255 256 257 258
		if (cookie)
			__cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
		else
			cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
259 260
	if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
		IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
261 262 263 264 265

	if (send_frame)
		ieee80211_tx_skb(sdata, skb);
	else
		kfree_skb(skb);
266 267
}

268 269 270 271 272 273
void ieee80211_send_pspoll(struct ieee80211_local *local,
			   struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_pspoll *pspoll;
	struct sk_buff *skb;

274 275
	skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
	if (!skb)
276 277
		return;

278 279
	pspoll = (struct ieee80211_pspoll *) skb->data;
	pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
280

281 282
	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
	ieee80211_tx_skb(sdata, skb);
283 284
}

285 286 287 288 289
void ieee80211_send_nullfunc(struct ieee80211_local *local,
			     struct ieee80211_sub_if_data *sdata,
			     int powersave)
{
	struct sk_buff *skb;
290
	struct ieee80211_hdr_3addr *nullfunc;
291

292 293
	skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
	if (!skb)
294 295
		return;

296
	nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
297
	if (powersave)
298
		nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
299

300 301
	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
	ieee80211_tx_skb(sdata, skb);
302 303
}

304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335
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);
	if (!skb) {
		printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr "
		       "nullfunc frame\n", sdata->name);
		return;
	}
	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);
}

336 337 338 339 340 341 342
/* 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;

343
	if (!ieee80211_sdata_running(sdata))
344 345
		return;

346 347 348
	mutex_lock(&ifmgd->mtx);
	if (!ifmgd->associated)
		goto out;
349 350

	sdata->local->oper_channel = sdata->local->csa_channel;
351 352 353 354 355
	if (!sdata->local->ops->channel_switch) {
		/* call "hw_config" only if doing sw channel switch */
		ieee80211_hw_config(sdata->local,
			IEEE80211_CONF_CHANGE_CHANNEL);
	}
356

357
	/* XXX: shouldn't really modify cfg80211-owned data! */
358
	ifmgd->associated->channel = sdata->local->oper_channel;
359 360 361

	ieee80211_wake_queues_by_reason(&sdata->local->hw,
					IEEE80211_QUEUE_STOP_REASON_CSA);
362 363 364
 out:
	ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
	mutex_unlock(&ifmgd->mtx);
365 366
}

367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389
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);

390 391 392 393 394 395
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;

396 397 398 399 400
	if (sdata->local->quiescing) {
		set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
		return;
	}

401
	ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
402 403 404 405
}

void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
				      struct ieee80211_channel_sw_ie *sw_elem,
406 407
				      struct ieee80211_bss *bss,
				      u64 timestamp)
408
{
409 410
	struct cfg80211_bss *cbss =
		container_of((void *)bss, struct cfg80211_bss, priv);
411 412 413 414
	struct ieee80211_channel *new_ch;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);

415 416 417
	ASSERT_MGD_MTX(ifmgd);

	if (!ifmgd->associated)
418 419
		return;

420
	if (sdata->local->scanning)
421 422 423 424 425 426 427 428 429 430 431 432 433 434
		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;

435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452
	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 */
453
	if (sw_elem->count <= 1) {
454
		ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
455
	} else {
456 457
		if (sw_elem->mode)
			ieee80211_stop_queues_by_reason(&sdata->local->hw,
458 459 460 461 462
					IEEE80211_QUEUE_STOP_REASON_CSA);
		ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
		mod_timer(&ifmgd->chswitch_timer,
			  jiffies +
			  msecs_to_jiffies(sw_elem->count *
463
					   cbss->beacon_interval));
464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486
	}
}

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);
	}
}

487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519
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);

520 521 522 523 524 525
/* 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
526 527 528 529
	/*
	 * If we are scanning right now then the parameters will
	 * take effect when scan finishes.
	 */
530
	if (local->scanning)
Johannes Berg's avatar
Johannes Berg committed
531 532
		return;

533 534 535 536 537 538 539
	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);
540

541 542 543 544 545 546
		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);
547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564
	}
}

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);
	}
}

/* need to hold RTNL or interface lock */
565
void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
566 567 568
{
	struct ieee80211_sub_if_data *sdata, *found = NULL;
	int count = 0;
569
	int timeout;
570 571 572 573 574 575

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

576 577 578 579 580
	if (!list_empty(&local->work_list)) {
		local->ps_sdata = NULL;
		goto change;
	}

581
	list_for_each_entry(sdata, &local->interfaces, list) {
582
		if (!ieee80211_sdata_running(sdata))
583 584 585 586 587 588 589
			continue;
		if (sdata->vif.type != NL80211_IFTYPE_STATION)
			continue;
		found = sdata;
		count++;
	}

590
	if (count == 1 && found->u.mgd.powersave &&
591
	    found->u.mgd.associated &&
592
	    found->u.mgd.associated->beacon_ies &&
593 594
	    !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
				    IEEE80211_STA_CONNECTION_POLL))) {
595
		struct ieee80211_conf *conf = &local->hw.conf;
596 597 598
		s32 beaconint_us;

		if (latency < 0)
Mark Gross's avatar
Mark Gross committed
599
			latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
600 601 602 603

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

604
		timeout = local->dynamic_ps_forced_timeout;
605 606
		if (timeout < 0) {
			/*
607 608
			 * Go to full PSM if the user configures a very low
			 * latency requirement.
609 610 611 612
			 * The 2 second value is there for compatibility until
			 * the PM_QOS_NETWORK_LATENCY is configured with real
			 * values.
			 */
613
			if (latency > 1900000000 && latency != 2000000000)
614
				timeout = 0;
615 616
			else
				timeout = 100;
617
		}
618 619 620 621
		local->dynamic_ps_user_timeout = timeout;
		if (!local->disable_dynamic_ps)
			conf->dynamic_ps_timeout =
				local->dynamic_ps_user_timeout;
622

623
		if (beaconint_us > latency) {
624
			local->ps_sdata = NULL;
625
		} else {
626
			struct ieee80211_bss *bss;
627
			int maxslp = 1;
628
			u8 dtimper;
629

630 631 632 633 634 635 636
			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)
637 638 639
				maxslp = min_t(int, dtimper,
						    latency / beaconint_us);

640
			local->hw.conf.max_sleep_period = maxslp;
641
			local->hw.conf.ps_dtim_period = dtimper;
642
			local->ps_sdata = found;
643
		}
644
	} else {
645
		local->ps_sdata = NULL;
646
	}
647

648
 change:
649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672
	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;
673
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
674 675 676 677 678 679 680 681

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

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

682 683
	if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
	    (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)))
684 685
		ieee80211_send_nullfunc(local, sdata, 1);

686 687
	if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
	      (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
688 689 690 691 692
	    (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);
	}
693 694 695 696 697 698
}

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

699
	if (local->quiescing || local->suspended)
700 701
		return;

702
	ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
703 704
}

Johannes Berg's avatar
Johannes Berg committed
705
/* MLME */
706
static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
707
				     struct ieee80211_sub_if_data *sdata,
708 709 710
				     u8 *wmm_param, size_t wmm_param_len)
{
	struct ieee80211_tx_queue_params params;
711
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
712 713
	size_t left;
	int count;
714
	u8 *pos, uapsd_queues = 0;
715

716 717 718
	if (!local->ops->conf_tx)
		return;

719
	if (local->hw.queues < 4)
720 721 722 723 724
		return;

	if (!wmm_param)
		return;

725 726
	if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
		return;
727 728

	if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
729
		uapsd_queues = local->uapsd_queues;
730

731
	count = wmm_param[6] & 0x0f;
732
	if (count == ifmgd->wmm_last_param_set)
733
		return;
734
	ifmgd->wmm_last_param_set = count;
735 736 737 738 739 740 741 742 743 744

	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;
745
		bool uapsd = false;
746 747 748
		int queue;

		switch (aci) {
749
		case 1: /* AC_BK */
Johannes Berg's avatar
Johannes Berg committed
750
			queue = 3;
Johannes Berg's avatar
Johannes Berg committed
751
			if (acm)
752
				local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
753 754
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
				uapsd = true;
755
			break;
756
		case 2: /* AC_VI */
Johannes Berg's avatar
Johannes Berg committed
757
			queue = 1;
Johannes Berg's avatar
Johannes Berg committed
758
			if (acm)
759
				local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
760 761
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
				uapsd = true;
762
			break;
763
		case 3: /* AC_VO */
Johannes Berg's avatar
Johannes Berg committed
764
			queue = 0;
Johannes Berg's avatar
Johannes Berg committed
765
			if (acm)
766
				local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
767 768
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
				uapsd = true;
769
			break;
770
		case 0: /* AC_BE */
771
		default:
Johannes Berg's avatar
Johannes Berg committed
772
			queue = 2;
Johannes Berg's avatar
Johannes Berg committed
773
			if (acm)
774
				local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
775 776
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
				uapsd = true;
777 778 779 780 781 782
			break;
		}

		params.aifs = pos[0] & 0x0f;
		params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
		params.cw_min = ecw2cw(pos[1] & 0x0f);
783
		params.txop = get_unaligned_le16(pos + 2);
784 785
		params.uapsd = uapsd;

786
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
Joe Perches's avatar
Joe Perches committed
787 788 789 790 791 792
		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);
793
#endif
794
		if (drv_conf_tx(local, queue, &params))
Joe Perches's avatar
Joe Perches committed
795 796 797
			wiphy_debug(local->hw.wiphy,
				    "failed to set TX queue parameters for queue %d\n",
				    queue);
798
	}
799 800

	/* enable WMM or activate new settings */
801 802
	sdata->vif.bss_conf.qos = true;
	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
803 804
}

805 806
static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
					   u16 capab, bool erp_valid, u8 erp)
807
{
808
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
809
	u32 changed = 0;
810 811 812 813 814 815 816 817 818 819 820 821 822
	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);
823 824
	if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
		use_short_slot = true;
825

826 827 828
	if (use_protection != bss_conf->use_cts_prot) {
		bss_conf->use_cts_prot = use_protection;
		changed |= BSS_CHANGED_ERP_CTS_PROT;
829
	}
830

831 832
	if (use_short_preamble != bss_conf->use_short_preamble) {
		bss_conf->use_short_preamble = use_short_preamble;
833
		changed |= BSS_CHANGED_ERP_PREAMBLE;
834
	}
835

836 837 838
	if (use_short_slot != bss_conf->use_short_slot) {
		bss_conf->use_short_slot = use_short_slot;
		changed |= BSS_CHANGED_ERP_SLOT;
839 840 841 842 843
	}

	return changed;
}

844
static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
845
				     struct cfg80211_bss *cbss,
Johannes Berg's avatar
Johannes Berg committed
846
				     u32 bss_info_changed)
847
{
848
	struct ieee80211_bss *bss = (void *)cbss->priv;
849
	struct ieee80211_local *local = sdata->local;
850
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
851

Johannes Berg's avatar
Johannes Berg committed
852
	bss_info_changed |= BSS_CHANGED_ASSOC;
853
	/* set timing information */
854 855
	bss_conf->beacon_int = cbss->beacon_interval;
	bss_conf->timestamp = cbss->tsf;
856

857 858
	bss_info_changed |= BSS_CHANGED_BEACON_INT;
	bss_info_changed |= ieee80211_handle_bss_capability(sdata,
859
		cbss->capability, bss->has_erp_value, bss->erp_value);
860

861 862
	sdata->u.mgd.associated = cbss;
	memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
863

864 865
	sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;

866 867 868 869
	/* just to be sure */
	sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
				IEEE80211_STA_BEACON_POLL);

870 871 872 873 874 875 876 877
	/*
	 * Always handle WMM once after association regardless
	 * of the first value the AP uses. Setting -1 here has
	 * that effect because the AP values is an unsigned
	 * 4-bit value.
	 */
	sdata->u.mgd.wmm_last_param_set = -1;

878
	ieee80211_led_assoc(local, 1);
879

880 881 882 883 884
	if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
		bss_conf->dtim_period = bss->dtim_period;
	else
		bss_conf->dtim_period = 0;

885
	bss_conf->assoc = 1;
886 887 888 889 890
	/*
	 * 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
891
	bss_info_changed |= BSS_CHANGED_BASIC_RATES;
892 893 894 895

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

896 897
	/* Tell the driver to monitor connection quality (if supported) */
	if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) &&
898
	    bss_conf->cqm_rssi_thold)
899 900
		bss_info_changed |= BSS_CHANGED_CQM;

901 902 903 904 905 906
	/* 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
907
	ieee80211_bss_info_change_notify(sdata, bss_info_changed);
908

Johannes Berg's avatar
Johannes Berg committed
909 910
	mutex_lock(&local->iflist_mtx);
	ieee80211_recalc_ps(local, -1);
911
	ieee80211_recalc_smps(local, sdata);
Johannes Berg's avatar
Johannes Berg committed
912
	mutex_unlock(&local->iflist_mtx);
913

914
	netif_tx_start_all_queues(sdata->dev);
915
	netif_carrier_on(sdata->dev);
916 917
}

918 919
static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
				   bool remove_sta)
920
{
921
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
922 923
	struct ieee80211_local *local = sdata->local;
	struct sta_info *sta;
924
	u32 changed = 0, config_changed = 0;
925
	u8 bssid[ETH_ALEN];
926

927 928
	ASSERT_MGD_MTX(ifmgd);

929 930 931
	if (WARN_ON(!ifmgd->associated))
		return;

932
	memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
933

934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949
	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.
	 */
950

951
	netif_tx_stop_all_queues(sdata->dev);
952 953
	netif_carrier_off(sdata->dev);

954
	mutex_lock(&local->sta_mtx);
955
	sta = sta_info_get(sdata, bssid);
956
	if (sta) {
957
		set_sta_flags(sta, WLAN_STA_BLOCK_BA);
958
		ieee80211_sta_tear_down_BA_sessions(sta);
959
	}
960
	mutex_unlock(&local->sta_mtx);
961

962 963 964
	changed |= ieee80211_reset_erp_info(sdata);

	ieee80211_led_assoc(local, 0);
Johannes Berg's avatar
Johannes Berg committed
965 966
	changed |= BSS_CHANGED_ASSOC;
	sdata->vif.bss_conf.assoc = false;
967

968 969
	ieee80211_set_wmm_default(sdata);

970
	/* channel(_type) changes are handled by ieee80211_hw_config */
971
	WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
972

973 974 975
	/* on the next assoc, re-program HT parameters */
	sdata->ht_opmode_valid = false;

976 977
	local->power_constr_level = 0;

978 979 980
	del_timer_sync(&local->dynamic_ps_timer);
	cancel_work_sync(&local->dynamic_ps_enable_work);

981 982 983 984
	if (local->hw.conf.flags & IEEE80211_CONF_PS) {
		local->hw.conf.flags &= ~IEEE80211_CONF_PS;
		config_changed |= IEEE80211_CONF_CHANGE_PS;
	}
Johannes Berg's avatar
Johannes Berg committed
985

986
	ieee80211_hw_config(local, config_changed);
987

988 989 990 991 992 993
	/* Disable ARP filtering */
	if (sdata->vif.bss_conf.arp_filter_enabled) {
		sdata->vif.bss_conf.arp_filter_enabled = false;
		changed |= BSS_CHANGED_ARP_FILTER;
	}

994 995
	/* The BSSID (not really interesting) and HT changed */
	changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
Johannes Berg's avatar
Johannes Berg committed
996
	ieee80211_bss_info_change_notify(sdata, changed);
997

998 999
	if (remove_sta)
		sta_info_destroy_addr(sdata, bssid);
1000 1001 1002 1003 1004

	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);
1005
}
1006

1007 1008 1009 1010 1011 1012 1013 1014
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
1015 1016
	 * data idle periods for sending the periodic probe request to the
	 * AP we're connected to.
1017
	 */
1018 1019 1020
	if (is_multicast_ether_addr(hdr->addr1))
		return;

1021 1022 1023
	if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
		return;

1024 1025
	mod_timer(&sdata->u.mgd.conn_mon_timer,
		  round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
1026
}
1027

1028 1029 1030 1031 1032
static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
{