mlme.c 72 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 99 100 101 102 103 104
/*
 * 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,

105 106
	/* caller must tell cfg80211 about internal error */
	RX_MGMT_CFG80211_ASSOC_ERROR,
107 108
};

109
/* utils */
110 111
static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
{
112
	lockdep_assert_held(&ifmgd->mtx);
113 114
}

Johannes Berg's avatar
Johannes Berg committed
115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134
/*
 * 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);
}

135
void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
136 137 138 139 140
{
	if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
		return;

	mod_timer(&sdata->u.mgd.bcn_mon_timer,
141
		  round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
142 143
}

144 145
void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
{
146 147
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

148 149 150 151 152
	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));
153 154

	ifmgd->probe_send_count = 0;
155 156
}

157
static int ecw2cw(int ecw)
Johannes Berg's avatar
Johannes Berg committed
158
{
159
	return (1 << ecw) - 1;
Johannes Berg's avatar
Johannes Berg committed
160 161
}

162 163 164 165 166 167 168
/*
 * 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,
169
			       const u8 *bssid, u16 ap_ht_cap_flags)
170 171 172 173 174
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_supported_band *sband;
	struct sta_info *sta;
	u32 changed = 0;
175
	int hti_cfreq;
176
	u16 ht_opmode;
177 178
	bool enable_ht = true;
	enum nl80211_channel_type prev_chantype;
179 180 181 182
	enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;

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

183 184
	prev_chantype = sdata->vif.bss_conf.channel_type;

185 186 187 188
	/* HT is not supported */
	if (!sband->ht_cap.ht_supported)
		enable_ht = false;

189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209
	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;
		}
	}
210 211 212 213 214 215 216 217 218

	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:
219 220 221
				if (!(local->hw.conf.channel->flags &
				    IEEE80211_CHAN_NO_HT40PLUS))
					channel_type = NL80211_CHAN_HT40PLUS;
222 223
				break;
			case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
224 225 226
				if (!(local->hw.conf.channel->flags &
				    IEEE80211_CHAN_NO_HT40MINUS))
					channel_type = NL80211_CHAN_HT40MINUS;
227 228 229 230 231
				break;
			}
		}
	}

232 233
	if (local->tmp_channel)
		local->tmp_channel_type = channel_type;
234

235 236 237 238 239
	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));
	}
240

241 242
	/* channel_type change automatically detected */
	ieee80211_hw_config(local, 0);
243

244
	if (prev_chantype != channel_type) {
245
		rcu_read_lock();
246
		sta = sta_info_get(sdata, bssid);
247 248
		if (sta)
			rate_control_rate_update(local, sband, sta,
249
						 IEEE80211_RC_HT_CHANGED,
250
						 channel_type);
251
		rcu_read_unlock();
252
	}
253

254
	ht_opmode = le16_to_cpu(hti->operation_mode);
255 256

	/* if bss configuration changed store the new one */
257 258 259
	if (sdata->ht_opmode_valid != enable_ht ||
	    sdata->vif.bss_conf.ht_operation_mode != ht_opmode ||
	    prev_chantype != channel_type) {
260
		changed |= BSS_CHANGED_HT;
261
		sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
262
		sdata->ht_opmode_valid = enable_ht;
263 264 265 266 267
	}

	return changed;
}

268 269
/* frame sending functions */

270
static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
Johannes Berg's avatar
Johannes Berg committed
271
					   const u8 *bssid, u16 stype, u16 reason,
272
					   void *cookie, bool send_frame)
273 274
{
	struct ieee80211_local *local = sdata->local;
275
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
276 277
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;
278

279
	skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
280
	if (!skb) {
281
		printk(KERN_DEBUG "%s: failed to allocate buffer for "
282
		       "deauth/disassoc frame\n", sdata->name);
283 284 285 286 287 288
		return;
	}
	skb_reserve(skb, local->hw.extra_tx_headroom);

	mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
	memset(mgmt, 0, 24);
289
	memcpy(mgmt->da, bssid, ETH_ALEN);
290
	memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
291
	memcpy(mgmt->bssid, bssid, ETH_ALEN);
292
	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
293
	skb_put(skb, 2);
294
	/* u.deauth.reason_code == u.disassoc.reason_code */
295 296
	mgmt->u.deauth.reason_code = cpu_to_le16(reason);

297
	if (stype == IEEE80211_STYPE_DEAUTH)
298 299 300 301
		if (cookie)
			__cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
		else
			cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
302
	else
303 304 305 306
		if (cookie)
			__cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
		else
			cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
307 308
	if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
		IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
309 310 311 312 313

	if (send_frame)
		ieee80211_tx_skb(sdata, skb);
	else
		kfree_skb(skb);
314 315
}

316 317 318 319 320 321
void ieee80211_send_pspoll(struct ieee80211_local *local,
			   struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_pspoll *pspoll;
	struct sk_buff *skb;

322 323
	skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
	if (!skb)
324 325
		return;

326 327
	pspoll = (struct ieee80211_pspoll *) skb->data;
	pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
328

329 330
	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
	ieee80211_tx_skb(sdata, skb);
331 332
}

333 334 335 336 337
void ieee80211_send_nullfunc(struct ieee80211_local *local,
			     struct ieee80211_sub_if_data *sdata,
			     int powersave)
{
	struct sk_buff *skb;
338
	struct ieee80211_hdr_3addr *nullfunc;
339

340 341
	skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
	if (!skb)
342 343
		return;

344
	nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
345
	if (powersave)
346
		nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
347

348 349
	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
	ieee80211_tx_skb(sdata, skb);
350 351
}

352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383
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);
}

384 385 386 387 388 389 390
/* 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;

391
	if (!ieee80211_sdata_running(sdata))
392 393
		return;

394 395 396
	mutex_lock(&ifmgd->mtx);
	if (!ifmgd->associated)
		goto out;
397 398

	sdata->local->oper_channel = sdata->local->csa_channel;
399 400 401 402 403
	if (!sdata->local->ops->channel_switch) {
		/* call "hw_config" only if doing sw channel switch */
		ieee80211_hw_config(sdata->local,
			IEEE80211_CONF_CHANGE_CHANNEL);
	}
404

405
	/* XXX: shouldn't really modify cfg80211-owned data! */
406
	ifmgd->associated->channel = sdata->local->oper_channel;
407 408 409

	ieee80211_wake_queues_by_reason(&sdata->local->hw,
					IEEE80211_QUEUE_STOP_REASON_CSA);
410 411 412
 out:
	ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
	mutex_unlock(&ifmgd->mtx);
413 414
}

415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437
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);

438 439 440 441 442 443
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;

444 445 446 447 448
	if (sdata->local->quiescing) {
		set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
		return;
	}

449
	ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
450 451 452 453
}

void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
				      struct ieee80211_channel_sw_ie *sw_elem,
454 455
				      struct ieee80211_bss *bss,
				      u64 timestamp)
456
{
457 458
	struct cfg80211_bss *cbss =
		container_of((void *)bss, struct cfg80211_bss, priv);
459 460
	struct ieee80211_channel *new_ch;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
461 462
	int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num,
						      cbss->channel->band);
463

464 465 466
	ASSERT_MGD_MTX(ifmgd);

	if (!ifmgd->associated)
467 468
		return;

469
	if (sdata->local->scanning)
470 471 472 473 474 475 476 477 478 479 480 481 482 483
		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;

484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501
	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 */
502
	if (sw_elem->count <= 1) {
503
		ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
504
	} else {
505 506
		if (sw_elem->mode)
			ieee80211_stop_queues_by_reason(&sdata->local->hw,
507 508 509 510 511
					IEEE80211_QUEUE_STOP_REASON_CSA);
		ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
		mod_timer(&ifmgd->chswitch_timer,
			  jiffies +
			  msecs_to_jiffies(sw_elem->count *
512
					   cbss->beacon_interval));
513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535
	}
}

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);
	}
}

536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568
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);

569 570 571 572 573 574
/* 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
575 576 577 578
	/*
	 * If we are scanning right now then the parameters will
	 * take effect when scan finishes.
	 */
579
	if (local->scanning)
Johannes Berg's avatar
Johannes Berg committed
580 581
		return;

582 583 584 585 586 587 588
	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);
589

590 591 592 593 594 595
		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);
596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613
	}
}

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 */
614
void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
615 616 617
{
	struct ieee80211_sub_if_data *sdata, *found = NULL;
	int count = 0;
618
	int timeout;
619 620 621 622 623 624

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

625 626 627 628 629
	if (!list_empty(&local->work_list)) {
		local->ps_sdata = NULL;
		goto change;
	}

630
	list_for_each_entry(sdata, &local->interfaces, list) {
631
		if (!ieee80211_sdata_running(sdata))
632
			continue;
633 634 635 636 637 638 639 640
		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;
		}
641 642 643 644 645 646
		if (sdata->vif.type != NL80211_IFTYPE_STATION)
			continue;
		found = sdata;
		count++;
	}

647
	if (count == 1 && found->u.mgd.powersave &&
648
	    found->u.mgd.associated &&
649
	    found->u.mgd.associated->beacon_ies &&
650 651
	    !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
				    IEEE80211_STA_CONNECTION_POLL))) {
652
		struct ieee80211_conf *conf = &local->hw.conf;
653 654 655
		s32 beaconint_us;

		if (latency < 0)
Mark Gross's avatar
Mark Gross committed
656
			latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
657 658 659 660

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

661
		timeout = local->dynamic_ps_forced_timeout;
662 663
		if (timeout < 0) {
			/*
664 665
			 * Go to full PSM if the user configures a very low
			 * latency requirement.
666 667 668
			 * The 2000 second value is there for compatibility
			 * until the PM_QOS_NETWORK_LATENCY is configured
			 * with real values.
669
			 */
670 671
			if (latency > (1900 * USEC_PER_MSEC) &&
			    latency != (2000 * USEC_PER_SEC))
672
				timeout = 0;
673 674
			else
				timeout = 100;
675
		}
676 677 678 679
		local->dynamic_ps_user_timeout = timeout;
		if (!local->disable_dynamic_ps)
			conf->dynamic_ps_timeout =
				local->dynamic_ps_user_timeout;
680

681
		if (beaconint_us > latency) {
682
			local->ps_sdata = NULL;
683
		} else {
684
			struct ieee80211_bss *bss;
685
			int maxslp = 1;
686
			u8 dtimper;
687

688 689 690 691 692 693 694
			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)
695 696 697
				maxslp = min_t(int, dtimper,
						    latency / beaconint_us);

698
			local->hw.conf.max_sleep_period = maxslp;
699
			local->hw.conf.ps_dtim_period = dtimper;
700
			local->ps_sdata = found;
701
		}
702
	} else {
703
		local->ps_sdata = NULL;
704
	}
705

706
 change:
707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730
	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;
731
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
732 733 734 735 736 737 738 739

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

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

740 741
	if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
	    (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)))
742 743
		ieee80211_send_nullfunc(local, sdata, 1);

744 745
	if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
	      (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
746 747 748 749 750
	    (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);
	}
751 752 753 754 755 756
}

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

757
	if (local->quiescing || local->suspended)
758 759
		return;

760
	ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
761 762
}

Johannes Berg's avatar
Johannes Berg committed
763
/* MLME */
764
static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
765
				     struct ieee80211_sub_if_data *sdata,
766 767 768
				     u8 *wmm_param, size_t wmm_param_len)
{
	struct ieee80211_tx_queue_params params;
769
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
770 771
	size_t left;
	int count;
772
	u8 *pos, uapsd_queues = 0;
773

774 775 776
	if (!local->ops->conf_tx)
		return;

777
	if (local->hw.queues < 4)
778 779 780 781 782
		return;

	if (!wmm_param)
		return;

783 784
	if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
		return;
785 786

	if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
787
		uapsd_queues = local->uapsd_queues;
788

789
	count = wmm_param[6] & 0x0f;
790
	if (count == ifmgd->wmm_last_param_set)
791
		return;
792
	ifmgd->wmm_last_param_set = count;
793 794 795 796 797 798 799 800 801 802

	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;
803
		bool uapsd = false;
804 805 806
		int queue;

		switch (aci) {
807
		case 1: /* AC_BK */
Johannes Berg's avatar
Johannes Berg committed
808
			queue = 3;
Johannes Berg's avatar
Johannes Berg committed
809
			if (acm)
810
				local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
811 812
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
				uapsd = true;
813
			break;
814
		case 2: /* AC_VI */
Johannes Berg's avatar
Johannes Berg committed
815
			queue = 1;
Johannes Berg's avatar
Johannes Berg committed
816
			if (acm)
817
				local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
818 819
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
				uapsd = true;
820
			break;
821
		case 3: /* AC_VO */
Johannes Berg's avatar
Johannes Berg committed
822
			queue = 0;
Johannes Berg's avatar
Johannes Berg committed
823
			if (acm)
824
				local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
825 826
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
				uapsd = true;
827
			break;
828
		case 0: /* AC_BE */
829
		default:
Johannes Berg's avatar
Johannes Berg committed
830
			queue = 2;
Johannes Berg's avatar
Johannes Berg committed
831
			if (acm)
832
				local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
833 834
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
				uapsd = true;
835 836 837 838 839 840
			break;
		}

		params.aifs = pos[0] & 0x0f;
		params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
		params.cw_min = ecw2cw(pos[1] & 0x0f);
841
		params.txop = get_unaligned_le16(pos + 2);
842 843
		params.uapsd = uapsd;

844
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
Joe Perches's avatar
Joe Perches committed
845 846 847 848 849 850
		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);
851
#endif
852
		if (drv_conf_tx(local, queue, &params))
Joe Perches's avatar
Joe Perches committed
853 854 855
			wiphy_debug(local->hw.wiphy,
				    "failed to set TX queue parameters for queue %d\n",
				    queue);
856
	}
857 858

	/* enable WMM or activate new settings */
859 860
	sdata->vif.bss_conf.qos = true;
	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
861 862
}

863 864
static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
					   u16 capab, bool erp_valid, u8 erp)
865
{
866
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
867
	u32 changed = 0;
868 869 870 871 872 873 874 875 876 877 878 879 880
	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);
881 882
	if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
		use_short_slot = true;
883

884 885 886
	if (use_protection != bss_conf->use_cts_prot) {
		bss_conf->use_cts_prot = use_protection;
		changed |= BSS_CHANGED_ERP_CTS_PROT;
887
	}
888

889 890
	if (use_short_preamble != bss_conf->use_short_preamble) {
		bss_conf->use_short_preamble = use_short_preamble;
891
		changed |= BSS_CHANGED_ERP_PREAMBLE;
892
	}
893

894 895 896
	if (use_short_slot != bss_conf->use_short_slot) {
		bss_conf->use_short_slot = use_short_slot;
		changed |= BSS_CHANGED_ERP_SLOT;
897 898 899 900 901
	}

	return changed;
}

902
static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
903
				     struct cfg80211_bss *cbss,
Johannes Berg's avatar
Johannes Berg committed
904
				     u32 bss_info_changed)
905
{
906
	struct ieee80211_bss *bss = (void *)cbss->priv;
907
	struct ieee80211_local *local = sdata->local;
908
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
909

Johannes Berg's avatar
Johannes Berg committed
910
	bss_info_changed |= BSS_CHANGED_ASSOC;
911
	/* set timing information */
912 913
	bss_conf->beacon_int = cbss->beacon_interval;
	bss_conf->timestamp = cbss->tsf;
914

915 916
	bss_info_changed |= BSS_CHANGED_BEACON_INT;
	bss_info_changed |= ieee80211_handle_bss_capability(sdata,
917
		cbss->capability, bss->has_erp_value, bss->erp_value);
918

919 920 921
	sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
		IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int));

922 923
	sdata->u.mgd.associated = cbss;
	memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
924

925 926
	sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;

927 928 929 930
	/* just to be sure */
	sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
				IEEE80211_STA_BEACON_POLL);

931
	ieee80211_led_assoc(local, 1);
932

933 934 935 936 937
	if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
		bss_conf->dtim_period = bss->dtim_period;
	else
		bss_conf->dtim_period = 0;

938
	bss_conf->assoc = 1;
939 940 941 942 943
	/*
	 * 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
944
	bss_info_changed |= BSS_CHANGED_BASIC_RATES;
945 946 947 948

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

949 950
	/* Tell the driver to monitor connection quality (if supported) */
	if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) &&
951
	    bss_conf->cqm_rssi_thold)
952 953
		bss_info_changed |= BSS_CHANGED_CQM;

954 955 956 957 958 959
	/* 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
960
	ieee80211_bss_info_change_notify(sdata, bss_info_changed);
961

Johannes Berg's avatar
Johannes Berg committed
962 963
	mutex_lock(&local->iflist_mtx);
	ieee80211_recalc_ps(local, -1);
964
	ieee80211_recalc_smps(local);
Johannes Berg's avatar
Johannes Berg committed
965
	mutex_unlock(&local->iflist_mtx);
966

967
	netif_tx_start_all_queues(sdata->dev);
968
	netif_carrier_on(sdata->dev);
969 970
}

971
static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
972
				   bool remove_sta, bool tx)
973
{
974
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
975 976
	struct ieee80211_local *local = sdata->local;
	struct sta_info *sta;
977
	u32 changed = 0, config_changed = 0;
978
	u8 bssid[ETH_ALEN];
979

980 981
	ASSERT_MGD_MTX(ifmgd);

982 983 984
	if (WARN_ON(!ifmgd->associated))
		return;

985
	memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
986

987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002
	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.
	 */
1003

1004
	netif_tx_stop_all_queues(sdata->dev);
1005 1006
	netif_carrier_off(sdata->dev);

1007
	mutex_lock(&local->sta_mtx);
1008
	sta = sta_info_get(sdata, bssid);
1009
	if (sta) {
1010
		set_sta_flags(sta, WLAN_STA_BLOCK_BA);
1011
		ieee80211_sta_tear_down_BA_sessions(sta, tx);
1012
	}
1013
	mutex_unlock(&local->sta_mtx);
1014

1015 1016 1017
	changed |= ieee80211_reset_erp_info(sdata);

	ieee80211_led_assoc(local, 0);
Johannes Berg's avatar
Johannes Berg committed
1018 1019
	changed |= BSS_CHANGED_ASSOC;
	sdata->vif.bss_conf.assoc = false;
1020

1021 1022
	ieee80211_set_wmm_default(sdata);

1023
	/* channel(_type) changes are handled by ieee80211_hw_config */
1024
	WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
1025

1026 1027 1028
	/* on the next assoc, re-program HT parameters */
	sdata->ht_opmode_valid = false;

1029 1030
	local->power_constr_level = 0;