mlme.c 54.6 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
void ieee80211_send_pspoll(struct ieee80211_local *local,
			   struct ieee80211_sub_if_data *sdata)
{
252
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
253
254
255
256
257
258
259
	struct ieee80211_pspoll *pspoll;
	struct sk_buff *skb;
	u16 fc;

	skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
	if (!skb) {
		printk(KERN_DEBUG "%s: failed to allocate buffer for "
260
		       "pspoll frame\n", sdata->name);
261
262
263
264
265
266
267
268
		return;
	}
	skb_reserve(skb, local->hw.extra_tx_headroom);

	pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
	memset(pspoll, 0, sizeof(*pspoll));
	fc = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_PSPOLL | IEEE80211_FCTL_PM;
	pspoll->frame_control = cpu_to_le16(fc);
269
	pspoll->aid = cpu_to_le16(ifmgd->aid);
270
271
272
273

	/* aid in PS-Poll has its two MSBs each set to 1 */
	pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);

274
	memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
275
	memcpy(pspoll->ta, sdata->vif.addr, ETH_ALEN);
276

277
278
	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
	ieee80211_tx_skb(sdata, skb);
279
280
}

281
282
283
284
285
286
287
288
289
290
291
292
293
294
void ieee80211_send_nullfunc(struct ieee80211_local *local,
			     struct ieee80211_sub_if_data *sdata,
			     int powersave)
{
	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 + 24);
	if (!skb) {
		printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
295
		       "frame\n", sdata->name);
296
297
298
299
300
301
302
303
304
305
306
307
		return;
	}
	skb_reserve(skb, local->hw.extra_tx_headroom);

	nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
	memset(nullfunc, 0, 24);
	fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
			 IEEE80211_FCTL_TODS);
	if (powersave)
		fc |= cpu_to_le16(IEEE80211_FCTL_PM);
	nullfunc->frame_control = fc;
	memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
308
	memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
309
310
	memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);

311
312
	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
	ieee80211_tx_skb(sdata, skb);
313
314
}

315
316
317
318
319
320
321
/* 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;

322
	if (!ieee80211_sdata_running(sdata))
323
324
		return;

325
326
327
	mutex_lock(&ifmgd->mtx);
	if (!ifmgd->associated)
		goto out;
328
329

	sdata->local->oper_channel = sdata->local->csa_channel;
330
331
	ieee80211_hw_config(sdata->local, IEEE80211_CONF_CHANGE_CHANNEL);

332
	/* XXX: shouldn't really modify cfg80211-owned data! */
333
	ifmgd->associated->channel = sdata->local->oper_channel;
334
335
336

	ieee80211_wake_queues_by_reason(&sdata->local->hw,
					IEEE80211_QUEUE_STOP_REASON_CSA);
337
338
339
 out:
	ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
	mutex_unlock(&ifmgd->mtx);
340
341
342
343
344
345
346
347
}

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;

348
349
350
351
352
	if (sdata->local->quiescing) {
		set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
		return;
	}

353
	ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
354
355
356
357
358
359
}

void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
				      struct ieee80211_channel_sw_ie *sw_elem,
				      struct ieee80211_bss *bss)
{
360
361
	struct cfg80211_bss *cbss =
		container_of((void *)bss, struct cfg80211_bss, priv);
362
363
364
365
	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);

366
367
368
	ASSERT_MGD_MTX(ifmgd);

	if (!ifmgd->associated)
369
370
		return;

371
	if (sdata->local->scanning)
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
		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) {
387
		ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
388
389
390
391
392
393
394
	} 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 *
395
					   cbss->beacon_interval));
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
	}
}

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);
	}
}

419
420
421
422
423
424
/* 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
425
426
427
428
	/*
	 * If we are scanning right now then the parameters will
	 * take effect when scan finishes.
	 */
429
	if (local->scanning)
Johannes Berg's avatar
Johannes Berg committed
430
431
		return;

432
433
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
	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 */
459
void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
460
461
462
463
464
465
466
467
468
{
	struct ieee80211_sub_if_data *sdata, *found = NULL;
	int count = 0;

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

469
470
471
472
473
	if (!list_empty(&local->work_list)) {
		local->ps_sdata = NULL;
		goto change;
	}

474
	list_for_each_entry(sdata, &local->interfaces, list) {
475
		if (!ieee80211_sdata_running(sdata))
476
477
478
479
480
481
482
			continue;
		if (sdata->vif.type != NL80211_IFTYPE_STATION)
			continue;
		found = sdata;
		count++;
	}

483
	if (count == 1 && found->u.mgd.powersave &&
484
	    found->u.mgd.associated &&
485
486
	    !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
				    IEEE80211_STA_CONNECTION_POLL))) {
487
488
489
490
491
492
493
494
		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);

495
		if (beaconint_us > latency) {
496
			local->ps_sdata = NULL;
497
498
499
500
501
502
503
504
		} else {
			u8 dtimper = found->vif.bss_conf.dtim_period;
			int maxslp = 1;

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

505
			local->hw.conf.max_sleep_period = maxslp;
506
			local->ps_sdata = found;
507
		}
508
	} else {
509
		local->ps_sdata = NULL;
510
	}
511

512
 change:
513
514
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
	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;

556
	if (local->quiescing || local->suspended)
557
558
		return;

559
	ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
560
561
}

Johannes Berg's avatar
Johannes Berg committed
562
/* MLME */
563
static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
564
				     struct ieee80211_if_managed *ifmgd,
565
566
567
568
569
570
571
				     u8 *wmm_param, size_t wmm_param_len)
{
	struct ieee80211_tx_queue_params params;
	size_t left;
	int count;
	u8 *pos;

572
	if (local->hw.queues < 4)
573
574
575
576
577
		return;

	if (!wmm_param)
		return;

578
579
580
	if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
		return;
	count = wmm_param[6] & 0x0f;
581
	if (count == ifmgd->wmm_last_param_set)
582
		return;
583
	ifmgd->wmm_last_param_set = count;
584
585
586
587
588
589
590
591
592
593
594
595
596

	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) {
597
		case 1: /* AC_BK */
Johannes Berg's avatar
Johannes Berg committed
598
			queue = 3;
Johannes Berg's avatar
Johannes Berg committed
599
			if (acm)
600
				local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
601
			break;
602
		case 2: /* AC_VI */
Johannes Berg's avatar
Johannes Berg committed
603
			queue = 1;
Johannes Berg's avatar
Johannes Berg committed
604
			if (acm)
605
				local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
606
			break;
607
		case 3: /* AC_VO */
Johannes Berg's avatar
Johannes Berg committed
608
			queue = 0;
Johannes Berg's avatar
Johannes Berg committed
609
			if (acm)
610
				local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
611
			break;
612
		case 0: /* AC_BE */
613
		default:
Johannes Berg's avatar
Johannes Berg committed
614
			queue = 2;
Johannes Berg's avatar
Johannes Berg committed
615
			if (acm)
616
				local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
617
618
619
620
621
622
			break;
		}

		params.aifs = pos[0] & 0x0f;
		params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
		params.cw_min = ecw2cw(pos[1] & 0x0f);
623
		params.txop = get_unaligned_le16(pos + 2);
624
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
625
		printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
626
		       "cWmin=%d cWmax=%d txop=%d\n",
627
628
		       wiphy_name(local->hw.wiphy), queue, aci, acm,
		       params.aifs, params.cw_min, params.cw_max, params.txop);
629
#endif
630
		if (drv_conf_tx(local, queue, &params) && local->ops->conf_tx)
631
			printk(KERN_DEBUG "%s: failed to set TX queue "
632
633
			       "parameters for queue %d\n",
			       wiphy_name(local->hw.wiphy), queue);
634
635
636
	}
}

637
638
static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
					   u16 capab, bool erp_valid, u8 erp)
639
{
640
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
641
	u32 changed = 0;
642
643
644
645
646
647
648
649
650
651
652
653
654
	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);
655

656
657
658
	if (use_protection != bss_conf->use_cts_prot) {
		bss_conf->use_cts_prot = use_protection;
		changed |= BSS_CHANGED_ERP_CTS_PROT;
659
	}
660

661
662
	if (use_short_preamble != bss_conf->use_short_preamble) {
		bss_conf->use_short_preamble = use_short_preamble;
663
		changed |= BSS_CHANGED_ERP_PREAMBLE;
664
	}
665

666
667
668
	if (use_short_slot != bss_conf->use_short_slot) {
		bss_conf->use_short_slot = use_short_slot;
		changed |= BSS_CHANGED_ERP_SLOT;
669
670
671
672
673
	}

	return changed;
}

674
static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
675
				     struct cfg80211_bss *cbss,
Johannes Berg's avatar
Johannes Berg committed
676
				     u32 bss_info_changed)
677
{
678
	struct ieee80211_bss *bss = (void *)cbss->priv;
679
	struct ieee80211_local *local = sdata->local;
680

Johannes Berg's avatar
Johannes Berg committed
681
	bss_info_changed |= BSS_CHANGED_ASSOC;
682
	/* set timing information */
683
684
	sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
	sdata->vif.bss_conf.timestamp = cbss->tsf;
685
	sdata->vif.bss_conf.dtim_period = bss->dtim_period;
686

687
688
	bss_info_changed |= BSS_CHANGED_BEACON_INT;
	bss_info_changed |= ieee80211_handle_bss_capability(sdata,
689
		cbss->capability, bss->has_erp_value, bss->erp_value);
690

691
692
	sdata->u.mgd.associated = cbss;
	memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
693

694
695
696
697
	/* just to be sure */
	sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
				IEEE80211_STA_BEACON_POLL);

698
699
700
701
702
703
704
705
	/*
	 * 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;

706
	ieee80211_led_assoc(local, 1);
707

708
	sdata->vif.bss_conf.assoc = 1;
709
710
711
712
713
	/*
	 * 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
714
	bss_info_changed |= BSS_CHANGED_BASIC_RATES;
715
716
717
718

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

Johannes Berg's avatar
Johannes Berg committed
719
	ieee80211_bss_info_change_notify(sdata, bss_info_changed);
720

Johannes Berg's avatar
Johannes Berg committed
721
722
	mutex_lock(&local->iflist_mtx);
	ieee80211_recalc_ps(local, -1);
723
	ieee80211_recalc_smps(local, sdata);
Johannes Berg's avatar
Johannes Berg committed
724
	mutex_unlock(&local->iflist_mtx);
725

726
	netif_start_queue(sdata->dev);
727
	netif_carrier_on(sdata->dev);
728
729
}

730
static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata)
731
{
732
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
733
734
	struct ieee80211_local *local = sdata->local;
	struct sta_info *sta;
735
	u32 changed = 0, config_changed = 0;
736
	u8 bssid[ETH_ALEN];
737

738
739
	ASSERT_MGD_MTX(ifmgd);

740
741
742
	if (WARN_ON(!ifmgd->associated))
		return;

743
	memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
744

745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
	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.
	 */
761

762
	netif_stop_queue(sdata->dev);
763
764
	netif_carrier_off(sdata->dev);

765
	rcu_read_lock();
766
	sta = sta_info_get(sdata, bssid);
767
768
769
	if (sta)
		ieee80211_sta_tear_down_BA_sessions(sta);
	rcu_read_unlock();
770

771
772
773
	changed |= ieee80211_reset_erp_info(sdata);

	ieee80211_led_assoc(local, 0);
Johannes Berg's avatar
Johannes Berg committed
774
775
	changed |= BSS_CHANGED_ASSOC;
	sdata->vif.bss_conf.assoc = false;
776

777
778
	ieee80211_set_wmm_default(sdata);

779
	/* channel(_type) changes are handled by ieee80211_hw_config */
Sujith's avatar
Sujith committed
780
	local->oper_channel_type = NL80211_CHAN_NO_HT;
781

782
783
784
	/* on the next assoc, re-program HT parameters */
	sdata->ht_opmode_valid = false;

785
786
	local->power_constr_level = 0;

787
788
789
	del_timer_sync(&local->dynamic_ps_timer);
	cancel_work_sync(&local->dynamic_ps_enable_work);

790
791
792
793
	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
794

795
	ieee80211_hw_config(local, config_changed);
796
797
798

	/* And the BSSID changed -- not very interesting here */
	changed |= BSS_CHANGED_BSSID;
Johannes Berg's avatar
Johannes Berg committed
799
	ieee80211_bss_info_change_notify(sdata, changed);
800
801
802

	rcu_read_lock();

803
	sta = sta_info_get(sdata, bssid);
804
805
806
807
808
809
810
811
812
813
	if (!sta) {
		rcu_read_unlock();
		return;
	}

	sta_info_unlink(&sta);

	rcu_read_unlock();

	sta_info_destroy(sta);
814
}
815

816
817
818
819
820
821
822
823
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
824
825
	 * data idle periods for sending the periodic probe request to the
	 * AP we're connected to.
826
	 */
827
828
829
830
831
	if (is_multicast_ether_addr(hdr->addr1))
		return;

	mod_timer(&sdata->u.mgd.conn_mon_timer,
		  round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
832
}
833

834
835
836
837
838
static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	const u8 *ssid;

839
840
	ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
	ieee80211_send_probe_req(sdata, ifmgd->associated->bssid,
841
842
843
844
845
846
847
				 ssid + 2, ssid[1], NULL, 0);

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

848
849
static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
				   bool beacon)
850
851
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
852
	bool already = false;
853

854
	if (!ieee80211_sdata_running(sdata))
855
856
		return;

857
858
859
	if (sdata->local->scanning)
		return;

860
861
862
863
864
	mutex_lock(&ifmgd->mtx);

	if (!ifmgd->associated)
		goto out;

865
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
866
867
	if (beacon && net_ratelimit())
		printk(KERN_DEBUG "%s: detected beacon loss from AP "
868
		       "- sending probe request\n", sdata->name);
869
#endif
870

871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
	/*
	 * 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;

894
895
896
897
	mutex_lock(&sdata->local->iflist_mtx);
	ieee80211_recalc_ps(sdata->local, -1);
	mutex_unlock(&sdata->local->iflist_mtx);

898
899
	ifmgd->probe_send_count = 0;
	ieee80211_mgd_probe_ap_send(sdata);
900
901
 out:
	mutex_unlock(&ifmgd->mtx);
902
903
}

904
905
906
907
908
909
910
911
912
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);
}

913
914
915
916
void ieee80211_beacon_loss(struct ieee80211_vif *vif)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);

917
	ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work);
918
919
920
}
EXPORT_SYMBOL(ieee80211_beacon_loss);

921
922
923
static enum rx_mgmt_action __must_check
ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
			 struct ieee80211_mgmt *mgmt, size_t len)
924
{
925
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
926
	const u8 *bssid = NULL;
927
928
	u16 reason_code;

929
	if (len < 24 + 2)
930
		return RX_MGMT_NONE;
931

932
933
	ASSERT_MGD_MTX(ifmgd);

934
	bssid = ifmgd->associated->bssid;
935
936
937

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

938
	printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
939
			sdata->name, bssid, reason_code);
940

941
942
	ieee80211_set_disassoc(sdata);
	ieee80211_recalc_idle(sdata->local);
943

944
	return RX_MGMT_CFG80211_DEAUTH;
945
946
947
}


948
949
950
static enum rx_mgmt_action __must_check
ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
			   struct ieee80211_mgmt *mgmt, size_t len)
951
{
952
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
953
954
	u16 reason_code;

955
	if (len < 24 + 2)
956
		return RX_MGMT_NONE;
957

958
959
960
961
962
	ASSERT_MGD_MTX(ifmgd);

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

963
	if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
964
		return RX_MGMT_NONE;
965
966
967

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

968
	printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
969
			sdata->name, mgmt->sa, reason_code);
970

971
	ieee80211_set_disassoc(sdata);
972
	ieee80211_recalc_idle(sdata->local);
973
	return RX_MGMT_CFG80211_DISASSOC;
974
975
976
}


977
978
static bool ieee80211_assoc_success(struct ieee80211_work *wk,
				    struct ieee80211_mgmt *mgmt, size_t len)
979
{
980
	struct ieee80211_sub_if_data *sdata = wk->sdata;
981
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
982
	struct ieee80211_local *local = sdata->local;
983
	struct ieee80211_supported_band *sband;
984
	struct sta_info *sta;
985
	struct cfg80211_bss *cbss = wk->assoc.bss;
986
	u8 *pos;
987
	u32 rates, basic_rates;
988
	u16 capab_info, aid;
989
	struct ieee802_11_elems elems;
990
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
Johannes Berg's avatar
Johannes Berg committed
991
	u32 changed = 0;
992
993
	int i, j, err;
	bool have_higher_than_11mbit = false;
Johannes Berg's avatar
Johannes Berg committed
994
	u16 ap_ht_cap_flags;
995

996
	/* AssocResp and ReassocResp have identical structure */
997
998

	aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
999
	capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1000

1001
1002
	if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
		printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1003
		       "set\n", sdata->name, aid);
1004
1005
	aid &= ~(BIT(15) | BIT(14));

1006
1007
1008
	pos = mgmt->u.assoc_resp.variable;
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);

1009
1010
	if (!elems.supp_rates) {
		printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1011
		       sdata->name);
1012
		return false;
1013
1014
	}

1015
	ifmgd->aid = aid;
1016

1017
	sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1018
	if (!sta) {
1019
1020
		printk(KERN_DEBUG "%s: failed to alloc STA entry for"
		       " the AP\n", sdata->name);
1021
		return false;
1022
	}
1023

1024
1025
1026
1027
1028
	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
1029
1030
1031
	rates = 0;
	basic_rates = 0;
	sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1032

Johannes Berg's avatar
Johannes Berg committed
1033
1034
	for (i = 0; i < elems.supp_rates_len; i++) {
		int rate = (elems.supp_rates[i] & 0x7f) * 5;
1035
		bool is_basic = !!(elems.supp_rates[i] & 0x80);
1036

Johannes Berg's avatar
Johannes Berg committed
1037
1038
1039
1040
		if (rate > 110<