mlme.c 54.4 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_params.h>
21
#include <linux/crc32.h>
22
#include <net/mac80211.h>
23
#include <asm/unaligned.h>
Johannes Berg's avatar
Johannes Berg committed
24

25
#include "ieee80211_i.h"
26
#include "driver-ops.h"
Johannes Berg's avatar
Johannes Berg committed
27 28
#include "rate.h"
#include "led.h"
29 30 31 32 33

#define IEEE80211_AUTH_TIMEOUT (HZ / 5)
#define IEEE80211_AUTH_MAX_TRIES 3
#define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
#define IEEE80211_ASSOC_MAX_TRIES 3
34
#define IEEE80211_MAX_PROBE_TRIES 5
35 36 37 38 39 40 41 42 43 44

/*
 * 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.
 */
45
#define IEEE80211_CONNECTION_IDLE_TIME	(30 * HZ)
46 47 48 49 50
/*
 * Time we wait for a probe response after sending
 * a probe request because of beacon loss or for
 * checking the connection still works.
 */
51
#define IEEE80211_PROBE_WAIT		(HZ / 2)
52

53 54 55
#define TMR_RUNNING_TIMER	0
#define TMR_RUNNING_CHANSW	1

56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77
/*
 * 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,

78 79
	/* caller must tell cfg80211 about internal error */
	RX_MGMT_CFG80211_ASSOC_ERROR,
80 81
};

82
/* utils */
83 84 85 86 87
static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
{
	WARN_ON(!mutex_is_locked(&ifmgd->mtx));
}

Johannes Berg's avatar
Johannes Berg committed
88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107
/*
 * 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);
}

108 109 110 111 112 113 114 115 116
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));
}

117
static int ecw2cw(int ecw)
Johannes Berg's avatar
Johannes Berg committed
118
{
119
	return (1 << ecw) - 1;
Johannes Berg's avatar
Johannes Berg committed
120 121
}

122 123 124 125 126 127 128
/*
 * 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,
129
			       const u8 *bssid, u16 ap_ht_cap_flags)
130 131 132 133 134
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_supported_band *sband;
	struct sta_info *sta;
	u32 changed = 0;
135
	u16 ht_opmode;
136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157
	bool enable_ht = true, ht_changed;
	enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;

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

	/* 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:
158 159 160
				if (!(local->hw.conf.channel->flags &
				    IEEE80211_CHAN_NO_HT40PLUS))
					channel_type = NL80211_CHAN_HT40PLUS;
161 162
				break;
			case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
163 164 165
				if (!(local->hw.conf.channel->flags &
				    IEEE80211_CHAN_NO_HT40MINUS))
					channel_type = NL80211_CHAN_HT40MINUS;
166 167 168 169 170 171 172 173 174 175 176 177 178 179 180
				break;
			}
		}
	}

	ht_changed = conf_is_ht(&local->hw.conf) != enable_ht ||
		     channel_type != local->hw.conf.channel_type;

	local->oper_channel_type = channel_type;

	if (ht_changed) {
                /* channel_type change automatically detected */
		ieee80211_hw_config(local, 0);

		rcu_read_lock();
181
		sta = sta_info_get(sdata, bssid);
182 183 184 185 186 187 188 189 190 191
		if (sta)
			rate_control_rate_update(local, sband, sta,
						 IEEE80211_RC_HT_CHANGED);
		rcu_read_unlock();
        }

	/* disable HT */
	if (!enable_ht)
		return 0;

192
	ht_opmode = le16_to_cpu(hti->operation_mode);
193 194

	/* if bss configuration changed store the new one */
195 196
	if (!sdata->ht_opmode_valid ||
	    sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
197
		changed |= BSS_CHANGED_HT;
198
		sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
199
		sdata->ht_opmode_valid = true;
200 201 202 203 204
	}

	return changed;
}

205 206
/* frame sending functions */

207
static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
Johannes Berg's avatar
Johannes Berg committed
208 209
					   const u8 *bssid, u16 stype, u16 reason,
					   void *cookie)
210 211
{
	struct ieee80211_local *local = sdata->local;
212
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
213 214
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;
215

216
	skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
217
	if (!skb) {
218
		printk(KERN_DEBUG "%s: failed to allocate buffer for "
219
		       "deauth/disassoc frame\n", sdata->name);
220 221 222 223 224 225
		return;
	}
	skb_reserve(skb, local->hw.extra_tx_headroom);

	mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
	memset(mgmt, 0, 24);
226
	memcpy(mgmt->da, bssid, ETH_ALEN);
227
	memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
228
	memcpy(mgmt->bssid, bssid, ETH_ALEN);
229
	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
230
	skb_put(skb, 2);
231
	/* u.deauth.reason_code == u.disassoc.reason_code */
232 233
	mgmt->u.deauth.reason_code = cpu_to_le16(reason);

234
	if (stype == IEEE80211_STYPE_DEAUTH)
235 236 237 238
		if (cookie)
			__cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
		else
			cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
239
	else
240 241 242 243
		if (cookie)
			__cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
		else
			cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
244 245 246
	if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
		IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
	ieee80211_tx_skb(sdata, skb);
247 248
}

249 250 251 252 253 254
void ieee80211_send_pspoll(struct ieee80211_local *local,
			   struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_pspoll *pspoll;
	struct sk_buff *skb;

255 256
	skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
	if (!skb)
257 258
		return;

259 260
	pspoll = (struct ieee80211_pspoll *) skb->data;
	pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
261

262 263
	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
	ieee80211_tx_skb(sdata, skb);
264 265
}

266 267 268 269 270
void ieee80211_send_nullfunc(struct ieee80211_local *local,
			     struct ieee80211_sub_if_data *sdata,
			     int powersave)
{
	struct sk_buff *skb;
271
	struct ieee80211_hdr_3addr *nullfunc;
272

273 274
	skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
	if (!skb)
275 276
		return;

277
	nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
278
	if (powersave)
279
		nullfunc->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
}

285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316
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);
}

317 318 319 320 321 322 323
/* 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;

324
	if (!ieee80211_sdata_running(sdata))
325 326
		return;

327 328 329
	mutex_lock(&ifmgd->mtx);
	if (!ifmgd->associated)
		goto out;
330 331

	sdata->local->oper_channel = sdata->local->csa_channel;
332 333
	ieee80211_hw_config(sdata->local, IEEE80211_CONF_CHANGE_CHANNEL);

334
	/* XXX: shouldn't really modify cfg80211-owned data! */
335
	ifmgd->associated->channel = sdata->local->oper_channel;
336 337 338

	ieee80211_wake_queues_by_reason(&sdata->local->hw,
					IEEE80211_QUEUE_STOP_REASON_CSA);
339 340 341
 out:
	ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
	mutex_unlock(&ifmgd->mtx);
342 343 344 345 346 347 348 349
}

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;

350 351 352 353 354
	if (sdata->local->quiescing) {
		set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
		return;
	}

355
	ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
356 357 358 359 360 361
}

void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
				      struct ieee80211_channel_sw_ie *sw_elem,
				      struct ieee80211_bss *bss)
{
362 363
	struct cfg80211_bss *cbss =
		container_of((void *)bss, struct cfg80211_bss, priv);
364 365 366 367
	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);

368 369 370
	ASSERT_MGD_MTX(ifmgd);

	if (!ifmgd->associated)
371 372
		return;

373
	if (sdata->local->scanning)
374 375 376 377 378 379 380 381 382 383 384 385 386 387 388
		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;

	if (sw_elem->count <= 1) {
389
		ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
390 391 392 393 394 395 396
	} else {
		ieee80211_stop_queues_by_reason(&sdata->local->hw,
					IEEE80211_QUEUE_STOP_REASON_CSA);
		ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
		mod_timer(&ifmgd->chswitch_timer,
			  jiffies +
			  msecs_to_jiffies(sw_elem->count *
397
					   cbss->beacon_interval));
398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420
	}
}

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);
	}
}

421 422 423 424 425 426
/* 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
427 428 429 430
	/*
	 * If we are scanning right now then the parameters will
	 * take effect when scan finishes.
	 */
431
	if (local->scanning)
Johannes Berg's avatar
Johannes Berg committed
432 433
		return;

434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460
	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);
		conf->flags |= IEEE80211_CONF_PS;
		ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
	}
}

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 */
461
void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
462 463 464 465 466 467 468 469 470
{
	struct ieee80211_sub_if_data *sdata, *found = NULL;
	int count = 0;

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

471 472 473 474 475
	if (!list_empty(&local->work_list)) {
		local->ps_sdata = NULL;
		goto change;
	}

476
	list_for_each_entry(sdata, &local->interfaces, list) {
477
		if (!ieee80211_sdata_running(sdata))
478 479 480 481 482 483 484
			continue;
		if (sdata->vif.type != NL80211_IFTYPE_STATION)
			continue;
		found = sdata;
		count++;
	}

485
	if (count == 1 && found->u.mgd.powersave &&
486
	    found->u.mgd.associated &&
487 488
	    !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
				    IEEE80211_STA_CONNECTION_POLL))) {
489 490 491 492 493 494 495 496
		s32 beaconint_us;

		if (latency < 0)
			latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY);

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

497
		if (beaconint_us > latency) {
498
			local->ps_sdata = NULL;
499 500 501 502 503 504 505 506
		} else {
			u8 dtimper = found->vif.bss_conf.dtim_period;
			int maxslp = 1;

			if (dtimper > 1)
				maxslp = min_t(int, dtimper,
						    latency / beaconint_us);

507
			local->hw.conf.max_sleep_period = maxslp;
508
			local->ps_sdata = found;
509
		}
510
	} else {
511
		local->ps_sdata = NULL;
512
	}
513

514
 change:
515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557
	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;

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

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

	if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
		ieee80211_send_nullfunc(local, sdata, 1);

	local->hw.conf.flags |= IEEE80211_CONF_PS;
	ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
}

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

558
	if (local->quiescing || local->suspended)
559 560
		return;

561
	ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
562 563
}

Johannes Berg's avatar
Johannes Berg committed
564
/* MLME */
565
static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
566
				     struct ieee80211_if_managed *ifmgd,
567 568 569 570 571 572 573
				     u8 *wmm_param, size_t wmm_param_len)
{
	struct ieee80211_tx_queue_params params;
	size_t left;
	int count;
	u8 *pos;

574
	if (local->hw.queues < 4)
575 576 577 578 579
		return;

	if (!wmm_param)
		return;

580 581 582
	if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
		return;
	count = wmm_param[6] & 0x0f;
583
	if (count == ifmgd->wmm_last_param_set)
584
		return;
585
	ifmgd->wmm_last_param_set = count;
586 587 588 589 590 591 592 593 594 595 596 597 598

	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;
		int queue;

		switch (aci) {
599
		case 1: /* AC_BK */
Johannes Berg's avatar
Johannes Berg committed
600
			queue = 3;
Johannes Berg's avatar
Johannes Berg committed
601
			if (acm)
602
				local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
603
			break;
604
		case 2: /* AC_VI */
Johannes Berg's avatar
Johannes Berg committed
605
			queue = 1;
Johannes Berg's avatar
Johannes Berg committed
606
			if (acm)
607
				local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
608
			break;
609
		case 3: /* AC_VO */
Johannes Berg's avatar
Johannes Berg committed
610
			queue = 0;
Johannes Berg's avatar
Johannes Berg committed
611
			if (acm)
612
				local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
613
			break;
614
		case 0: /* AC_BE */
615
		default:
Johannes Berg's avatar
Johannes Berg committed
616
			queue = 2;
Johannes Berg's avatar
Johannes Berg committed
617
			if (acm)
618
				local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
619 620 621 622 623 624
			break;
		}

		params.aifs = pos[0] & 0x0f;
		params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
		params.cw_min = ecw2cw(pos[1] & 0x0f);
625
		params.txop = get_unaligned_le16(pos + 2);
626
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
627
		printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
628
		       "cWmin=%d cWmax=%d txop=%d\n",
629 630
		       wiphy_name(local->hw.wiphy), queue, aci, acm,
		       params.aifs, params.cw_min, params.cw_max, params.txop);
631
#endif
632
		if (drv_conf_tx(local, queue, &params) && local->ops->conf_tx)
633
			printk(KERN_DEBUG "%s: failed to set TX queue "
634 635
			       "parameters for queue %d\n",
			       wiphy_name(local->hw.wiphy), queue);
636 637 638
	}
}

639 640
static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
					   u16 capab, bool erp_valid, u8 erp)
641
{
642
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
643
	u32 changed = 0;
644 645 646 647 648 649 650 651 652 653 654 655 656
	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);
657

658 659 660
	if (use_protection != bss_conf->use_cts_prot) {
		bss_conf->use_cts_prot = use_protection;
		changed |= BSS_CHANGED_ERP_CTS_PROT;
661
	}
662

663 664
	if (use_short_preamble != bss_conf->use_short_preamble) {
		bss_conf->use_short_preamble = use_short_preamble;
665
		changed |= BSS_CHANGED_ERP_PREAMBLE;
666
	}
667

668 669 670
	if (use_short_slot != bss_conf->use_short_slot) {
		bss_conf->use_short_slot = use_short_slot;
		changed |= BSS_CHANGED_ERP_SLOT;
671 672 673 674 675
	}

	return changed;
}

676
static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
677
				     struct cfg80211_bss *cbss,
Johannes Berg's avatar
Johannes Berg committed
678
				     u32 bss_info_changed)
679
{
680
	struct ieee80211_bss *bss = (void *)cbss->priv;
681
	struct ieee80211_local *local = sdata->local;
682

Johannes Berg's avatar
Johannes Berg committed
683
	bss_info_changed |= BSS_CHANGED_ASSOC;
684
	/* set timing information */
685 686
	sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
	sdata->vif.bss_conf.timestamp = cbss->tsf;
687
	sdata->vif.bss_conf.dtim_period = bss->dtim_period;
688

689 690
	bss_info_changed |= BSS_CHANGED_BEACON_INT;
	bss_info_changed |= ieee80211_handle_bss_capability(sdata,
691
		cbss->capability, bss->has_erp_value, bss->erp_value);
692

693 694
	sdata->u.mgd.associated = cbss;
	memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
695

696 697 698 699
	/* just to be sure */
	sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
				IEEE80211_STA_BEACON_POLL);

700 701 702 703 704 705 706 707
	/*
	 * 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;

708
	ieee80211_led_assoc(local, 1);
709

710
	sdata->vif.bss_conf.assoc = 1;
711 712 713 714 715
	/*
	 * 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
716
	bss_info_changed |= BSS_CHANGED_BASIC_RATES;
717 718 719 720

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

Johannes Berg's avatar
Johannes Berg committed
721
	ieee80211_bss_info_change_notify(sdata, bss_info_changed);
722

Johannes Berg's avatar
Johannes Berg committed
723 724
	mutex_lock(&local->iflist_mtx);
	ieee80211_recalc_ps(local, -1);
725
	ieee80211_recalc_smps(local, sdata);
Johannes Berg's avatar
Johannes Berg committed
726
	mutex_unlock(&local->iflist_mtx);
727

728
	netif_tx_start_all_queues(sdata->dev);
729
	netif_carrier_on(sdata->dev);
730 731
}

732
static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata)
733
{
734
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
735 736
	struct ieee80211_local *local = sdata->local;
	struct sta_info *sta;
737
	u32 changed = 0, config_changed = 0;
738
	u8 bssid[ETH_ALEN];
739

740 741
	ASSERT_MGD_MTX(ifmgd);

742 743 744
	if (WARN_ON(!ifmgd->associated))
		return;

745
	memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
746

747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762
	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.
	 */
763

764
	netif_tx_stop_all_queues(sdata->dev);
765 766
	netif_carrier_off(sdata->dev);

767
	rcu_read_lock();
768
	sta = sta_info_get(sdata, bssid);
769 770 771
	if (sta)
		ieee80211_sta_tear_down_BA_sessions(sta);
	rcu_read_unlock();
772

773 774 775
	changed |= ieee80211_reset_erp_info(sdata);

	ieee80211_led_assoc(local, 0);
Johannes Berg's avatar
Johannes Berg committed
776 777
	changed |= BSS_CHANGED_ASSOC;
	sdata->vif.bss_conf.assoc = false;
778

779 780
	ieee80211_set_wmm_default(sdata);

781
	/* channel(_type) changes are handled by ieee80211_hw_config */
Sujith's avatar
Sujith committed
782
	local->oper_channel_type = NL80211_CHAN_NO_HT;
783

784 785 786
	/* on the next assoc, re-program HT parameters */
	sdata->ht_opmode_valid = false;

787 788
	local->power_constr_level = 0;

789 790 791
	del_timer_sync(&local->dynamic_ps_timer);
	cancel_work_sync(&local->dynamic_ps_enable_work);

792 793 794 795
	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
796

797
	ieee80211_hw_config(local, config_changed);
798 799 800

	/* And the BSSID changed -- not very interesting here */
	changed |= BSS_CHANGED_BSSID;
Johannes Berg's avatar
Johannes Berg committed
801
	ieee80211_bss_info_change_notify(sdata, changed);
802 803 804

	rcu_read_lock();

805
	sta = sta_info_get(sdata, bssid);
806 807 808 809 810 811 812 813 814 815
	if (!sta) {
		rcu_read_unlock();
		return;
	}

	sta_info_unlink(&sta);

	rcu_read_unlock();

	sta_info_destroy(sta);
816
}
817

818 819 820 821 822 823 824 825
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
826 827
	 * data idle periods for sending the periodic probe request to the
	 * AP we're connected to.
828
	 */
829 830 831 832 833
	if (is_multicast_ether_addr(hdr->addr1))
		return;

	mod_timer(&sdata->u.mgd.conn_mon_timer,
		  round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
834
}
835

836 837 838 839 840
static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	const u8 *ssid;

841 842
	ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
	ieee80211_send_probe_req(sdata, ifmgd->associated->bssid,
843 844 845 846 847 848 849
				 ssid + 2, ssid[1], NULL, 0);

	ifmgd->probe_send_count++;
	ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
	run_again(ifmgd, ifmgd->probe_timeout);
}

850 851
static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
				   bool beacon)
852 853
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
854
	bool already = false;
855

856
	if (!ieee80211_sdata_running(sdata))
857 858
		return;

859 860 861
	if (sdata->local->scanning)
		return;

862 863 864
	if (sdata->local->tmp_channel)
		return;

865 866 867 868 869
	mutex_lock(&ifmgd->mtx);

	if (!ifmgd->associated)
		goto out;

870
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
871 872
	if (beacon && net_ratelimit())
		printk(KERN_DEBUG "%s: detected beacon loss from AP "
873
		       "- sending probe request\n", sdata->name);
874
#endif
875

876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898
	/*
	 * The driver/our work has already reported this event or the
	 * connection monitoring has kicked in and we have already sent
	 * a probe request. Or maybe the AP died and the driver keeps
	 * reporting until we disassociate...
	 *
	 * In either case we have to ignore the current call to this
	 * function (except for setting the correct probe reason bit)
	 * because otherwise we would reset the timer every time and
	 * never check whether we received a probe response!
	 */
	if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
			    IEEE80211_STA_CONNECTION_POLL))
		already = true;

	if (beacon)
		ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
	else
		ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;

	if (already)
		goto out;

899 900 901 902
	mutex_lock(&sdata->local->iflist_mtx);
	ieee80211_recalc_ps(sdata->local, -1);
	mutex_unlock(&sdata->local->iflist_mtx);

903 904
	ifmgd->probe_send_count = 0;
	ieee80211_mgd_probe_ap_send(sdata);
905 906
 out:
	mutex_unlock(&ifmgd->mtx);
907 908
}

909 910 911 912 913 914 915 916 917
void ieee80211_beacon_loss_work(struct work_struct *work)
{
	struct ieee80211_sub_if_data *sdata =
		container_of(work, struct ieee80211_sub_if_data,
			     u.mgd.beacon_loss_work);

	ieee80211_mgd_probe_ap(sdata, true);
}

918 919 920 921
void ieee80211_beacon_loss(struct ieee80211_vif *vif)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);

922
	ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work);
923 924 925
}
EXPORT_SYMBOL(ieee80211_beacon_loss);

926 927 928
static enum rx_mgmt_action __must_check
ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
			 struct ieee80211_mgmt *mgmt, size_t len)
929
{
930
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
931
	const u8 *bssid = NULL;
932 933
	u16 reason_code;

934
	if (len < 24 + 2)
935
		return RX_MGMT_NONE;
936

937 938
	ASSERT_MGD_MTX(ifmgd);

939
	bssid = ifmgd->associated->bssid;
940 941 942

	reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);

943
	printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
944
			sdata->name, bssid, reason_code);
945

946 947
	ieee80211_set_disassoc(sdata);
	ieee80211_recalc_idle(sdata->local);
948

949
	return RX_MGMT_CFG80211_DEAUTH;
950 951 952
}


953 954 955
static enum rx_mgmt_action __must_check
ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
			   struct ieee80211_mgmt *mgmt, size_t len)
956
{
957
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
958 959
	u16 reason_code;

960
	if (len < 24 + 2)
961
		return RX_MGMT_NONE;
962

963 964 965 966 967
	ASSERT_MGD_MTX(ifmgd);

	if (WARN_ON(!ifmgd->associated))
		return RX_MGMT_NONE;

968
	if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
969
		return RX_MGMT_NONE;
970 971 972

	reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);

973
	printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
974
			sdata->name, mgmt->sa, reason_code);
975

976
	ieee80211_set_disassoc(sdata);
977
	ieee80211_recalc_idle(sdata->local);
978
	return RX_MGMT_CFG80211_DISASSOC;
979 980 981
}


982 983
static bool ieee80211_assoc_success(struct ieee80211_work *wk,
				    struct ieee80211_mgmt *mgmt, size_t len)
984
{
985
	struct ieee80211_sub_if_data *sdata = wk->sdata;
986
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
987
	struct ieee80211_local *local = sdata->local;
988
	struct ieee80211_supported_band *sband;
989
	struct sta_info *sta;
990
	struct cfg80211_bss *cbss = wk->assoc.bss;
991
	u8 *pos;
992
	u32 rates, basic_rates;
993
	u16 capab_info, aid;
994
	struct ieee802_11_elems elems;
995
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
Johannes Berg's avatar
Johannes Berg committed
996
	u32 changed = 0;
997 998
	int i, j, err;
	bool have_higher_than_11mbit = false;
Johannes Berg's avatar
Johannes Berg committed
999
	u16 ap_ht_cap_flags;
1000

1001
	/* AssocResp and ReassocResp have identical structure */
1002 1003

	aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1004
	capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1005

1006 1007
	if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
		printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1008
		       "set\n", sdata->name, aid);
1009 1010
	aid &= ~(BIT(15) | BIT(14));

1011 1012 1013
	pos = mgmt->u.assoc_resp.variable;
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);

1014 1015
	if (!elems.supp_rates) {
		printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1016
		       sdata->name);
1017
		return false;
1018 1019
	}

1020
	ifmgd->aid = aid;
1021

1022
	sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1023
	if (!sta) {
1024 1025
		printk(KERN_DEBUG "%s: failed to alloc STA entry for"
		       " the AP\n", sdata->name);
1026
		return false;
1027
	}
1028

1029 1030 1031 1032 1033
	set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
			   WLAN_STA_ASSOC_AP);
	if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
		set_sta_flags(sta, WLAN_STA_AUTHORIZED);

Johannes Berg's avatar
Johannes Berg committed
1034 1035 1036
	rates = 0;
	basic_rates = 0;
	sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1037

Johannes Berg's avatar
Johannes Berg committed
1038 1039
	for (i = 0; i < elems.supp_rates_len; i++) {
		int rate = (elems.supp_rates[i] & 0x7f) * 5;
1040
		bool is_basic = !!(elems.supp_rates[i] & 0x80);
1041

Johannes Berg's avatar
Johannes Berg committed
1042 1043 1044 1045
		if (rate > 110)
			have_higher_than_11mbit = true;

		for (j = 0; j < sband->n_bitrates; j++) {
1046
			if (sband->bitrates[j].bitrate == rate) {
Johannes Berg's avatar
Johannes Berg committed
1047
				rates |= BIT(j);
1048 1049 1050 1051
				if (is_basic)
					basic_rates |= BIT(j);
				break;
			}
1052 1053 1054
		}
	}

Johannes Berg's avatar
Johannes Berg committed
1055 1056
	for (i = 0; i < elems.ext_supp_rates_len; i++) {
		int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1057
		bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1058

Johannes Berg's avatar
Johannes Berg committed
1059 1060
		if (rate > 110)
			have_higher_than_11mbit = true;
1061

Johannes Berg's avatar
Johannes Berg committed
1062
		for (j = 0; j < sband->n_bitrates; j++) {
1063
			if (sband->bitrates[j].bitrate == rate) {
Johannes Berg's avatar
Johannes Berg committed
1064
				rates |= BIT(j);
1065 1066 1067 1068
				if (is_basic)
					basic_rates |= BIT(j);
				break;
			}
Johannes Berg's avatar
Johannes Berg committed
1069
		}
1070
	}
1071

1072
	sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1073
	sdata->vif.bss_conf.basic_rates = basic_rates;
Johannes Berg's avatar
Johannes Berg committed
1074 1075 1076 1077 1078 1079 1080

	/* cf. IEEE 802.11 9.2.12 */
	if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
	    have_higher_than_11mbit)
		sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
	else
		sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1081

1082
	if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
Johannes Berg's avatar
Johannes Berg committed
1083
		ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1084
				elems.ht_cap_elem, &sta->sta.ht_cap);
Johannes Berg's avatar
Johannes Berg committed
1085 1086

	ap_ht_cap_flags = sta->sta.ht_cap.cap;
1087

1088
	rate_control_rate_init(sta);
1089

1090
	if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1091 1092
		set_sta_flags(sta, WLAN_STA_MFP);

1093
	if (elems.wmm_param)
Johannes Berg's avatar
Johannes Berg committed
1094
		set_sta_flags(sta, WLAN_STA_WME);
1095

1096 1097 1098 1099 1100
	err = sta_info_insert(sta);
	sta = NULL;
	if (err) {
		printk(KERN_DEBUG "%s: failed to insert STA entry for"
		       " the AP (error %d)\n", sdata->name, err);
1101
		return false;
1102 1103 1104
	}

	if (elems.wmm_param)
1105
		ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
Johannes Berg's avatar
Johannes Berg committed
1106
					 elems.wmm_param_len);
1107 1108
	else
		ieee80211_set_wmm_default(sdata);
1109

1110 1111
	local->oper_channel = wk->chan;

Johannes Berg's avatar
Johannes Berg committed
1112
	if (elems.ht_info_elem && elems.wmm_param &&
1113
	    (sdata->local->hw.queues >= 4) &&
1114
	    !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
Johannes Berg's avatar
Johannes Berg committed
1115
		changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1116
					       cbss->bssid, ap_ht_cap_flags);
Johannes Berg's avatar
Johannes Berg committed
1117

Johannes Berg's avatar
Johannes Berg committed
1118 1119 1120 1121
	/* set AID and assoc capability,
	 * ieee80211_set_associated() will tell the driver */
	bss_conf->aid = aid;
	bss_conf->assoc_capability = capab_info;
1122
	ieee80211_set_associated(sdata, cbss, changed);
1123