mlme.c 97.9 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/moduleparam.h>
20
#include <linux/rtnetlink.h>
21
#include <linux/pm_qos.h>
22
#include <linux/crc32.h>
23
#include <linux/slab.h>
24
#include <linux/export.h>
25
#include <net/mac80211.h>
26
#include <asm/unaligned.h>
Johannes Berg's avatar
Johannes Berg committed
27

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

Johannes Berg's avatar
Johannes Berg committed
33
34
35
36
37
38
#define IEEE80211_AUTH_TIMEOUT (HZ / 5)
#define IEEE80211_AUTH_MAX_TRIES 3
#define IEEE80211_AUTH_WAIT_ASSOC (HZ * 5)
#define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
#define IEEE80211_ASSOC_MAX_TRIES 3

39
40
41
42
43
44
45
46
47
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).");
48
49

/*
50
51
52
53
54
55
 * 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.
56
 */
57
58
#define IEEE80211_BEACON_LOSS_COUNT	7

59
60
61
62
/*
 * Time the connection can be idle before we probe
 * it to see if we can still talk to the AP.
 */
63
#define IEEE80211_CONNECTION_IDLE_TIME	(30 * HZ)
64
65
66
67
68
/*
 * Time we wait for a probe response after sending
 * a probe request because of beacon loss or for
 * checking the connection still works.
 */
69
70
71
72
73
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).");
74

75
76
77
78
79
80
81
/*
 * 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

82
83
84
85
86
87
/*
 * 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

88
89
90
#define TMR_RUNNING_TIMER	0
#define TMR_RUNNING_CHANSW	1

91
92
#define DEAUTH_DISASSOC_LEN	(24 /* hdr */ + 2 /* reason */)

93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
/*
 * All cfg80211 functions have to be called outside a locked
 * section so that they can acquire a lock themselves... This
 * is much simpler than queuing up things in cfg80211, but we
 * do need some indirection for that here.
 */
enum rx_mgmt_action {
	/* no action required */
	RX_MGMT_NONE,

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

	/* caller must call cfg80211_send_disassoc() */
	RX_MGMT_CFG80211_DISASSOC,
Johannes Berg's avatar
Johannes Berg committed
108
109
110
111
112
113
114
115
116

	/* caller must call cfg80211_send_rx_auth() */
	RX_MGMT_CFG80211_RX_AUTH,

	/* caller must call cfg80211_send_rx_assoc() */
	RX_MGMT_CFG80211_RX_ASSOC,

	/* caller must call cfg80211_send_assoc_timeout() */
	RX_MGMT_CFG80211_ASSOC_TIMEOUT,
117
118
};

119
/* utils */
120
121
static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
{
122
	lockdep_assert_held(&ifmgd->mtx);
123
124
}

Johannes Berg's avatar
Johannes Berg committed
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.
 */
Johannes Berg's avatar
Johannes Berg committed
135
static void run_again(struct ieee80211_if_managed *ifmgd, unsigned long timeout)
Johannes Berg's avatar
Johannes Berg committed
136
137
138
139
140
141
142
143
{
	ASSERT_MGD_MTX(ifmgd);

	if (!timer_pending(&ifmgd->timer) ||
	    time_before(timeout, ifmgd->timer.expires))
		mod_timer(&ifmgd->timer, timeout);
}

144
void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
145
{
146
	if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
147
148
149
		return;

	mod_timer(&sdata->u.mgd.bcn_mon_timer,
150
		  round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
151
152
}

153
154
void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
{
155
156
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

157
158
159
	if (unlikely(!sdata->u.mgd.associated))
		return;

160
161
162
163
164
	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));
165
166

	ifmgd->probe_send_count = 0;
167
168
}

169
static int ecw2cw(int ecw)
Johannes Berg's avatar
Johannes Berg committed
170
{
171
	return (1 << ecw) - 1;
Johannes Berg's avatar
Johannes Berg committed
172
173
}

174
175
176
static u32 ieee80211_config_ht_tx(struct ieee80211_sub_if_data *sdata,
				  struct ieee80211_ht_operation *ht_oper,
				  const u8 *bssid, bool reconfig)
177
178
179
180
181
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_supported_band *sband;
	struct sta_info *sta;
	u32 changed = 0;
182
	u16 ht_opmode;
183
	bool disable_40 = false;
184
185
186

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

187
188
189
190
191
192
193
194
195
196
197
198
	switch (sdata->vif.bss_conf.channel_type) {
	case NL80211_CHAN_HT40PLUS:
		if (local->hw.conf.channel->flags & IEEE80211_CHAN_NO_HT40PLUS)
			disable_40 = true;
		break;
	case NL80211_CHAN_HT40MINUS:
		if (local->hw.conf.channel->flags & IEEE80211_CHAN_NO_HT40MINUS)
			disable_40 = true;
		break;
	default:
		break;
	}
199

200
201
	/* This can change during the lifetime of the BSS */
	if (!(ht_oper->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY))
202
203
204
205
		disable_40 = true;

	mutex_lock(&local->sta_mtx);
	sta = sta_info_get(sdata, bssid);
206

207
208
209
210
211
212
	WARN_ON_ONCE(!sta);

	if (sta && !sta->supports_40mhz)
		disable_40 = true;

	if (sta && (!reconfig ||
213
		    (disable_40 != !(sta->sta.ht_cap.cap &
214
					IEEE80211_HT_CAP_SUP_WIDTH_20_40)))) {
215

216
217
218
219
		if (disable_40)
			sta->sta.ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
		else
			sta->sta.ht_cap.cap |= IEEE80211_HT_CAP_SUP_WIDTH_20_40;
220

221
		rate_control_rate_update(local, sband, sta,
222
					 IEEE80211_RC_BW_CHANGED);
223
	}
224
	mutex_unlock(&local->sta_mtx);
225

226
	ht_opmode = le16_to_cpu(ht_oper->operation_mode);
227
228

	/* if bss configuration changed store the new one */
229
	if (!reconfig || (sdata->vif.bss_conf.ht_operation_mode != ht_opmode)) {
230
		changed |= BSS_CHANGED_HT;
231
		sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
232
233
234
235
236
	}

	return changed;
}

237
238
/* frame sending functions */

Johannes Berg's avatar
Johannes Berg committed
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
static int ieee80211_compatible_rates(const u8 *supp_rates, int supp_rates_len,
				      struct ieee80211_supported_band *sband,
				      u32 *rates)
{
	int i, j, count;
	*rates = 0;
	count = 0;
	for (i = 0; i < supp_rates_len; i++) {
		int rate = (supp_rates[i] & 0x7F) * 5;

		for (j = 0; j < sband->n_bitrates; j++)
			if (sband->bitrates[j].bitrate == rate) {
				*rates |= BIT(j);
				count++;
				break;
			}
	}

	return count;
}

static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
261
				struct sk_buff *skb, u8 ap_ht_param,
Johannes Berg's avatar
Johannes Berg committed
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
				struct ieee80211_supported_band *sband,
				struct ieee80211_channel *channel,
				enum ieee80211_smps_mode smps)
{
	u8 *pos;
	u32 flags = channel->flags;
	u16 cap;
	struct ieee80211_sta_ht_cap ht_cap;

	BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));

	memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
	ieee80211_apply_htcap_overrides(sdata, &ht_cap);

	/* determine capability flags */
	cap = ht_cap.cap;

279
	switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
Johannes Berg's avatar
Johannes Berg committed
280
281
282
283
284
285
286
287
288
289
290
291
292
293
	case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
		if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
			cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
			cap &= ~IEEE80211_HT_CAP_SGI_40;
		}
		break;
	case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
		if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
			cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
			cap &= ~IEEE80211_HT_CAP_SGI_40;
		}
		break;
	}

294
295
296
297
298
299
300
301
302
303
	/*
	 * If 40 MHz was disabled associate as though we weren't
	 * capable of 40 MHz -- some broken APs will never fall
	 * back to trying to transmit in 20 MHz.
	 */
	if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
		cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
		cap &= ~IEEE80211_HT_CAP_SGI_40;
	}

Johannes Berg's avatar
Johannes Berg committed
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
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
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
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
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
	/* set SM PS mode properly */
	cap &= ~IEEE80211_HT_CAP_SM_PS;
	switch (smps) {
	case IEEE80211_SMPS_AUTOMATIC:
	case IEEE80211_SMPS_NUM_MODES:
		WARN_ON(1);
	case IEEE80211_SMPS_OFF:
		cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
			IEEE80211_HT_CAP_SM_PS_SHIFT;
		break;
	case IEEE80211_SMPS_STATIC:
		cap |= WLAN_HT_CAP_SM_PS_STATIC <<
			IEEE80211_HT_CAP_SM_PS_SHIFT;
		break;
	case IEEE80211_SMPS_DYNAMIC:
		cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
			IEEE80211_HT_CAP_SM_PS_SHIFT;
		break;
	}

	/* reserve and fill IE */
	pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
	ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
}

static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;
	u8 *pos, qos_info;
	size_t offset = 0, noffset;
	int i, count, rates_len, supp_rates_len;
	u16 capab;
	struct ieee80211_supported_band *sband;
	u32 rates = 0;

	lockdep_assert_held(&ifmgd->mtx);

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

	if (assoc_data->supp_rates_len) {
		/*
		 * Get all rates supported by the device and the AP as
		 * some APs don't like getting a superset of their rates
		 * in the association request (e.g. D-Link DAP 1353 in
		 * b-only mode)...
		 */
		rates_len = ieee80211_compatible_rates(assoc_data->supp_rates,
						       assoc_data->supp_rates_len,
						       sband, &rates);
	} else {
		/*
		 * In case AP not provide any supported rates information
		 * before association, we send information element(s) with
		 * all rates that we support.
		 */
		rates = ~0;
		rates_len = sband->n_bitrates;
	}

	skb = alloc_skb(local->hw.extra_tx_headroom +
			sizeof(*mgmt) + /* bit too much but doesn't matter */
			2 + assoc_data->ssid_len + /* SSID */
			4 + rates_len + /* (extended) rates */
			4 + /* power capability */
			2 + 2 * sband->n_channels + /* supported channels */
			2 + sizeof(struct ieee80211_ht_cap) + /* HT */
			assoc_data->ie_len + /* extra IEs */
			9, /* WMM */
			GFP_KERNEL);
	if (!skb)
		return;

	skb_reserve(skb, local->hw.extra_tx_headroom);

	capab = WLAN_CAPABILITY_ESS;

	if (sband->band == IEEE80211_BAND_2GHZ) {
		if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_SLOT_INCAPABLE))
			capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
		if (!(local->hw.flags & IEEE80211_HW_2GHZ_SHORT_PREAMBLE_INCAPABLE))
			capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
	}

	if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
		capab |= WLAN_CAPABILITY_PRIVACY;

	if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
	    (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
		capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;

	mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
	memset(mgmt, 0, 24);
	memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
	memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
	memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);

	if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
		skb_put(skb, 10);
		mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
						  IEEE80211_STYPE_REASSOC_REQ);
		mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
		mgmt->u.reassoc_req.listen_interval =
				cpu_to_le16(local->hw.conf.listen_interval);
		memcpy(mgmt->u.reassoc_req.current_ap, assoc_data->prev_bssid,
		       ETH_ALEN);
	} else {
		skb_put(skb, 4);
		mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
						  IEEE80211_STYPE_ASSOC_REQ);
		mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
		mgmt->u.assoc_req.listen_interval =
				cpu_to_le16(local->hw.conf.listen_interval);
	}

	/* SSID */
	pos = skb_put(skb, 2 + assoc_data->ssid_len);
	*pos++ = WLAN_EID_SSID;
	*pos++ = assoc_data->ssid_len;
	memcpy(pos, assoc_data->ssid, assoc_data->ssid_len);

	/* add all rates which were marked to be used above */
	supp_rates_len = rates_len;
	if (supp_rates_len > 8)
		supp_rates_len = 8;

	pos = skb_put(skb, supp_rates_len + 2);
	*pos++ = WLAN_EID_SUPP_RATES;
	*pos++ = supp_rates_len;

	count = 0;
	for (i = 0; i < sband->n_bitrates; i++) {
		if (BIT(i) & rates) {
			int rate = sband->bitrates[i].bitrate;
			*pos++ = (u8) (rate / 5);
			if (++count == 8)
				break;
		}
	}

	if (rates_len > count) {
		pos = skb_put(skb, rates_len - count + 2);
		*pos++ = WLAN_EID_EXT_SUPP_RATES;
		*pos++ = rates_len - count;

		for (i++; i < sband->n_bitrates; i++) {
			if (BIT(i) & rates) {
				int rate = sband->bitrates[i].bitrate;
				*pos++ = (u8) (rate / 5);
			}
		}
	}

	if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
		/* 1. power capabilities */
		pos = skb_put(skb, 4);
		*pos++ = WLAN_EID_PWR_CAPABILITY;
		*pos++ = 2;
		*pos++ = 0; /* min tx power */
		*pos++ = local->oper_channel->max_power; /* max tx power */

		/* 2. supported channels */
		/* TODO: get this in reg domain format */
		pos = skb_put(skb, 2 * sband->n_channels + 2);
		*pos++ = WLAN_EID_SUPPORTED_CHANNELS;
		*pos++ = 2 * sband->n_channels;
		for (i = 0; i < sband->n_channels; i++) {
			*pos++ = ieee80211_frequency_to_channel(
					sband->channels[i].center_freq);
			*pos++ = 1; /* one channel in the subband*/
		}
	}

	/* if present, add any custom IEs that go before HT */
	if (assoc_data->ie_len && assoc_data->ie) {
		static const u8 before_ht[] = {
			WLAN_EID_SSID,
			WLAN_EID_SUPP_RATES,
			WLAN_EID_EXT_SUPP_RATES,
			WLAN_EID_PWR_CAPABILITY,
			WLAN_EID_SUPPORTED_CHANNELS,
			WLAN_EID_RSN,
			WLAN_EID_QOS_CAPA,
			WLAN_EID_RRM_ENABLED_CAPABILITIES,
			WLAN_EID_MOBILITY_DOMAIN,
			WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
		};
		noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
					     before_ht, ARRAY_SIZE(before_ht),
					     offset);
		pos = skb_put(skb, noffset - offset);
		memcpy(pos, assoc_data->ie + offset, noffset - offset);
		offset = noffset;
	}

Johannes Berg's avatar
Johannes Berg committed
502
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
503
		ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
Johannes Berg's avatar
Johannes Berg committed
504
505
506
507
508
509
510
511
512
513
514
515
				    sband, local->oper_channel, ifmgd->ap_smps);

	/* if present, add any custom non-vendor IEs that go after HT */
	if (assoc_data->ie_len && assoc_data->ie) {
		noffset = ieee80211_ie_split_vendor(assoc_data->ie,
						    assoc_data->ie_len,
						    offset);
		pos = skb_put(skb, noffset - offset);
		memcpy(pos, assoc_data->ie + offset, noffset - offset);
		offset = noffset;
	}

516
517
	if (assoc_data->wmm) {
		if (assoc_data->uapsd) {
518
519
			qos_info = ifmgd->uapsd_queues;
			qos_info |= (ifmgd->uapsd_max_sp_len <<
Johannes Berg's avatar
Johannes Berg committed
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
				     IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
		} else {
			qos_info = 0;
		}

		pos = skb_put(skb, 9);
		*pos++ = WLAN_EID_VENDOR_SPECIFIC;
		*pos++ = 7; /* len */
		*pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
		*pos++ = 0x50;
		*pos++ = 0xf2;
		*pos++ = 2; /* WME */
		*pos++ = 0; /* WME info */
		*pos++ = 1; /* WME ver */
		*pos++ = qos_info;
	}

	/* add any remaining custom (i.e. vendor specific here) IEs */
	if (assoc_data->ie_len && assoc_data->ie) {
		noffset = assoc_data->ie_len;
		pos = skb_put(skb, noffset - offset);
		memcpy(pos, assoc_data->ie + offset, noffset - offset);
	}

Johannes Berg's avatar
Johannes Berg committed
544
545
	drv_mgd_prepare_tx(local, sdata);

Johannes Berg's avatar
Johannes Berg committed
546
547
548
549
	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
	ieee80211_tx_skb(sdata, skb);
}

550
static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
551
					   const u8 *bssid, u16 stype,
552
553
					   u16 reason, bool send_frame,
					   u8 *frame_buf)
554
555
{
	struct ieee80211_local *local = sdata->local;
556
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
557
	struct sk_buff *skb;
558
	struct ieee80211_mgmt *mgmt = (void *)frame_buf;
559

560
561
562
563
	/* build frame */
	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
	mgmt->duration = 0; /* initialize only */
	mgmt->seq_ctrl = 0; /* initialize only */
564
	memcpy(mgmt->da, bssid, ETH_ALEN);
565
	memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
566
	memcpy(mgmt->bssid, bssid, ETH_ALEN);
567
	/* u.deauth.reason_code == u.disassoc.reason_code */
568
569
	mgmt->u.deauth.reason_code = cpu_to_le16(reason);

570
571
572
573
574
	if (send_frame) {
		skb = dev_alloc_skb(local->hw.extra_tx_headroom +
				    DEAUTH_DISASSOC_LEN);
		if (!skb)
			return;
575

576
577
578
579
580
581
582
583
584
		skb_reserve(skb, local->hw.extra_tx_headroom);

		/* copy in frame */
		memcpy(skb_put(skb, DEAUTH_DISASSOC_LEN),
		       mgmt, DEAUTH_DISASSOC_LEN);

		if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
			IEEE80211_SKB_CB(skb)->flags |=
				IEEE80211_TX_INTFL_DONT_ENCRYPT;
Johannes Berg's avatar
Johannes Berg committed
585
586
587

		drv_mgd_prepare_tx(local, sdata);

588
		ieee80211_tx_skb(sdata, skb);
589
	}
590
591
}

592
593
594
595
596
597
void ieee80211_send_pspoll(struct ieee80211_local *local,
			   struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_pspoll *pspoll;
	struct sk_buff *skb;

598
599
	skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
	if (!skb)
600
601
		return;

602
603
	pspoll = (struct ieee80211_pspoll *) skb->data;
	pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
604

605
606
	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
	ieee80211_tx_skb(sdata, skb);
607
608
}

609
610
611
612
613
void ieee80211_send_nullfunc(struct ieee80211_local *local,
			     struct ieee80211_sub_if_data *sdata,
			     int powersave)
{
	struct sk_buff *skb;
614
	struct ieee80211_hdr_3addr *nullfunc;
615
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
616

617
618
	skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
	if (!skb)
619
620
		return;

621
	nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
622
	if (powersave)
623
		nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
624

625
	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
626
627
628
629
	if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
			    IEEE80211_STA_CONNECTION_POLL))
		IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;

630
	ieee80211_tx_skb(sdata, skb);
631
632
}

633
634
635
636
637
638
639
640
641
642
643
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);
644
	if (!skb)
645
		return;
646

647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
	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);
}

663
664
665
666
667
668
669
/* 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;

670
	if (!ieee80211_sdata_running(sdata))
671
672
		return;

673
674
675
	mutex_lock(&ifmgd->mtx);
	if (!ifmgd->associated)
		goto out;
676
677

	sdata->local->oper_channel = sdata->local->csa_channel;
678
679
680
681
	if (!sdata->local->ops->channel_switch) {
		/* call "hw_config" only if doing sw channel switch */
		ieee80211_hw_config(sdata->local,
			IEEE80211_CONF_CHANGE_CHANNEL);
682
683
684
	} else {
		/* update the device channel directly */
		sdata->local->hw.conf.channel = sdata->local->oper_channel;
685
	}
686

687
	/* XXX: shouldn't really modify cfg80211-owned data! */
688
	ifmgd->associated->channel = sdata->local->oper_channel;
689
690
691

	ieee80211_wake_queues_by_reason(&sdata->local->hw,
					IEEE80211_QUEUE_STOP_REASON_CSA);
692
693
694
 out:
	ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
	mutex_unlock(&ifmgd->mtx);
695
696
}

697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
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);

720
721
722
723
724
725
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;

726
727
728
729
730
	if (sdata->local->quiescing) {
		set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
		return;
	}

731
	ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
732
733
734
735
}

void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
				      struct ieee80211_channel_sw_ie *sw_elem,
736
737
				      struct ieee80211_bss *bss,
				      u64 timestamp)
738
{
739
740
	struct cfg80211_bss *cbss =
		container_of((void *)bss, struct cfg80211_bss, priv);
741
742
	struct ieee80211_channel *new_ch;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
743
744
	int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num,
						      cbss->channel->band);
745

746
747
748
	ASSERT_MGD_MTX(ifmgd);

	if (!ifmgd->associated)
749
750
		return;

751
	if (sdata->local->scanning)
752
753
754
755
756
757
758
759
760
761
762
763
764
765
		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;

766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
	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 */
784
	if (sw_elem->count <= 1) {
785
		ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
786
	} else {
787
788
		if (sw_elem->mode)
			ieee80211_stop_queues_by_reason(&sdata->local->hw,
789
790
791
792
793
					IEEE80211_QUEUE_STOP_REASON_CSA);
		ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
		mod_timer(&ifmgd->chswitch_timer,
			  jiffies +
			  msecs_to_jiffies(sw_elem->count *
794
					   cbss->beacon_interval));
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
	}
}

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;

811
	if ((*pwr_constr_elem <= conf->channel->max_reg_power) &&
812
813
814
815
816
817
	    (*pwr_constr_elem != sdata->local->power_constr_level)) {
		sdata->local->power_constr_level = *pwr_constr_elem;
		ieee80211_hw_config(sdata->local, 0);
	}
}

818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
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);

851
852
853
854
855
856
/* 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
857
858
859
860
	/*
	 * If we are scanning right now then the parameters will
	 * take effect when scan finishes.
	 */
861
	if (local->scanning)
Johannes Berg's avatar
Johannes Berg committed
862
863
		return;

864
865
866
867
868
869
870
	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);
871

872
873
874
875
876
877
		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);
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
	}
}

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);
	}
}

895
896
897
898
static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *mgd = &sdata->u.mgd;
	struct sta_info *sta = NULL;
899
	bool authorized = false;
900
901
902
903

	if (!mgd->powersave)
		return false;

904
905
906
	if (mgd->broken_ap)
		return false;

907
908
909
910
911
912
913
914
915
916
	if (!mgd->associated)
		return false;

	if (mgd->flags & (IEEE80211_STA_BEACON_POLL |
			  IEEE80211_STA_CONNECTION_POLL))
		return false;

	rcu_read_lock();
	sta = sta_info_get(sdata, mgd->bssid);
	if (sta)
917
		authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
918
919
	rcu_read_unlock();

920
	return authorized;
921
922
}

923
/* need to hold RTNL or interface lock */
924
void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
925
926
927
{
	struct ieee80211_sub_if_data *sdata, *found = NULL;
	int count = 0;
928
	int timeout;
929
930
931
932
933
934
935

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

	list_for_each_entry(sdata, &local->interfaces, list) {
936
		if (!ieee80211_sdata_running(sdata))
937
			continue;
938
939
940
941
942
943
944
945
		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;
		}
946
947
948
949
950
951
		if (sdata->vif.type != NL80211_IFTYPE_STATION)
			continue;
		found = sdata;
		count++;
	}

952
	if (count == 1 && ieee80211_powersave_allowed(found)) {
953
		struct ieee80211_conf *conf = &local->hw.conf;
954
955
956
		s32 beaconint_us;

		if (latency < 0)
Mark Gross's avatar
Mark Gross committed
957
			latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
958
959
960
961

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

962
		timeout = local->dynamic_ps_forced_timeout;
963
964
		if (timeout < 0) {
			/*
965
966
			 * Go to full PSM if the user configures a very low
			 * latency requirement.
967
968
969
			 * The 2000 second value is there for compatibility
			 * until the PM_QOS_NETWORK_LATENCY is configured
			 * with real values.
970
			 */
971
972
			if (latency > (1900 * USEC_PER_MSEC) &&
			    latency != (2000 * USEC_PER_SEC))
973
				timeout = 0;
974
975
			else
				timeout = 100;
976
		}
977
978
979
980
		local->dynamic_ps_user_timeout = timeout;
		if (!local->disable_dynamic_ps)
			conf->dynamic_ps_timeout =
				local->dynamic_ps_user_timeout;
981

982
		if (beaconint_us > latency) {
983
			local->ps_sdata = NULL;
984
		} else {
985
			struct ieee80211_bss *bss;
986
			int maxslp = 1;
987
			u8 dtimper;
988

989
990
991
992
993
994
995
			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)
996
997
998
				maxslp = min_t(int, dtimper,
						    latency / beaconint_us);

999
			local->hw.conf.max_sleep_period = maxslp;
1000
			local->hw.conf.ps_dtim_period = dtimper;
1001
			local->ps_sdata = found;
1002
		}
1003
	} else {
1004
		local->ps_sdata = NULL;
1005
	}
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030

	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;
1031
	struct ieee80211_if_managed *ifmgd;
1032
1033
	unsigned long flags;
	int q;
1034
1035
1036
1037
1038

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

1039
1040
	ifmgd = &sdata->u.mgd;

1041
1042
1043
	if (local->hw.conf.flags & IEEE80211_CONF_PS)
		return;

1044
1045
1046
1047
	if (!local->disable_dynamic_ps &&
	    local->hw.conf.dynamic_ps_timeout > 0) {
		/* don't enter PS if TX frames are pending */
		if (drv_tx_frames_pending(local)) {
1048
1049
1050
1051
1052
			mod_timer(&local->dynamic_ps_timer, jiffies +
				  msecs_to_jiffies(
				  local->hw.conf.dynamic_ps_timeout));
			return;
		}
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070

		/*
		 * transmission can be stopped by others which leads to
		 * dynamic_ps_timer expiry. Postpone the ps timer if it
		 * is not the actual idle state.
		 */
		spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
		for (q = 0; q < local->hw.queues; q++) {
			if (local->queue_stop_reasons[q]) {
				spin_unlock_irqrestore(&local->queue_stop_reason_lock,
						       flags);
				mod_timer(&local->dynamic_ps_timer, jiffies +
					  msecs_to_jiffies(
					  local->hw.conf.dynamic_ps_timeout));
				return;
			}
		}
		spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1071
1072
	}

1073
	if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1074
	    !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1075
		netif_tx_stop_all_queues(sdata->dev);
1076

1077
1078
1079
1080
1081
1082
1083
1084
1085
		if (drv_tx_frames_pending(local))
			mod_timer(&local->dynamic_ps_timer, jiffies +
				  msecs_to_jiffies(
				  local->hw.conf.dynamic_ps_timeout));
		else {
			ieee80211_send_nullfunc(local, sdata, 1);
			/* Flush to get the tx status of nullfunc frame */
			drv_flush(local, false);
		}
1086
1087
	}

1088
1089
	if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
	      (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1090
1091
1092
1093
1094
	    (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);
	}
1095

1096
1097
	if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
		netif_tx_wake_all_queues(sdata->dev);
1098
1099
1100
1101
1102
1103
}

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

1104
	if (local->quiescing || local->suspended)
1105
1106
		return;

1107
	ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1108
1109
}

Johannes Berg's avatar
Johannes Berg committed
1110
/* MLME */
1111
static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1112
				     struct ieee80211_sub_if_data *sdata,
1113
1114
1115
				     u8 *wmm_param, size_t wmm_param_len)
{
	struct ieee80211_tx_queue_params params;
1116
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1117
1118
	size_t left;
	int count;
1119
	u8 *pos, uapsd_queues = 0;
1120

1121
	if (!local->ops->conf_tx)
1122
		return false;
1123

1124
	if (local->hw.queues < IEEE80211_NUM_ACS)
1125
		return false;
1126
1127

	if (!wmm_param)
1128
		return false;
1129

1130
	if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1131
		return false;
1132
1133

	if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1134
		uapsd_queues = ifmgd->uapsd_queues;
1135

1136
	count = wmm_param[6] & 0x0f;
1137
	if (count == ifmgd->wmm_last_param_set)
1138
		return false;
1139
	ifmgd->wmm_last_param_set = count;
1140
1141
1142
1143
1144
1145

	pos = wmm_param + 8;
	left = wmm_param_len - 8;

	memset(&params, 0, sizeof(params));

1146
	sdata->wmm_acm = 0;
1147
1148
1149
	for (; left >= 4; left -= 4, pos += 4) {
		int aci = (pos[0] >> 5) & 0x03;
		int acm = (pos[0] >> 4) & 0x01;
1150
		bool uapsd = false;
1151
1152
1153
		int queue;

		switch (aci) {
1154
		case 1: /* AC_BK */
Johannes Berg's avatar
Johannes Berg committed
1155
			queue = 3;
Johannes Berg's avatar
Johannes Berg committed
1156
			if (acm)
1157
				sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
1158
1159
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
				uapsd = true;
1160
			break;
1161
		case 2: /* AC_VI */
Johannes Berg's avatar
Johannes Berg committed
1162
			queue = 1;
Johannes Berg's avatar
Johannes Berg committed
1163
			if (acm)
1164
				sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
1165
1166
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
				uapsd = true;
1167
			break;
1168
		case 3: /* AC_VO */
Johannes Berg's avatar
Johannes Berg committed
1169
			queue = 0;
Johannes Berg's avatar
Johannes Berg committed
1170
			if (acm)
1171
				sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
1172
1173
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
				uapsd = true;
1174
			break;
1175
		case 0: /* AC_BE */
1176
		default:
Johannes Berg's avatar
Johannes Berg committed
1177
			queue = 2;
Johannes Berg's avatar
Johannes Berg committed
1178
			if (acm)
1179
				sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
1180
1181
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
				uapsd = true;
1182
1183
1184
1185
1186
1187
			break;
		}

		params.aifs = pos[0] & 0x0f;
		params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
		params.cw_min = ecw2cw(pos[1] & 0x0f);
1188
		params.txop = get_unaligned_le16(pos + 2);
1189
1190
		params.uapsd = uapsd;

Johannes Berg's avatar
Johannes Berg committed
1191
1192
1193
1194
1195
		mlme_dbg(sdata,
			 "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);
1196
1197
		sdata->tx_conf[queue] = params;
		if (drv_conf_tx(local, sdata, queue, &params))
Johannes Berg's avatar
Johannes Berg committed
1198
1199
1200
			sdata_err(sdata,
				  "failed to set TX queue parameters for queue %d\n",
				  queue);
1201
	}
1202
1203

	/* enable WMM or activate new settings */
1204
	sdata->vif.bss_conf.qos = true;
1205
	return true;
1206
1207
}

1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
{
	lockdep_assert_held(&sdata->local->mtx);

	sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
				IEEE80211_STA_BEACON_POLL);
	ieee80211_run_deferred_scan(sdata->local);
}

static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
{
	mutex_lock(&sdata->local->mtx);
	__ieee80211_stop_poll(sdata);
	mutex_unlock(&sdata->local->mtx);
}

1224
1225
static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
					   u16 capab, bool erp_valid, u8 erp)
1226
{
1227
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1228
	u32 changed = 0;
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
	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);
1242
1243
	if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
		use_short_slot = true;
1244

1245
1246
1247
	if (use_protection != bss_conf->use_cts_prot) {
		bss_conf->use_cts_prot = use_protection;
		changed |= BSS_CHANGED_ERP_CTS_PROT;
1248
	}
1249

1250
1251
	if (use_short_preamble != bss_conf->use_short_preamble) {
		bss_conf->use_short_preamble = use_short_preamble;
1252
		changed |= BSS_CHANGED_ERP_PREAMBLE;
1253
	}
1254

1255
1256
1257
	if (use_short_slot != bss_conf->use_short_slot) {
		bss_conf->use_short_slot = use_short_slot;
		changed |= BSS_CHANGED_ERP_SLOT;
1258
1259
1260
1261
1262
	}

	return changed;
}

1263
static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1264
				     struct cfg80211_bss *cbss,
Johannes Berg's avatar
Johannes Berg committed
1265
				     u32 bss_info_changed)
1266
{
1267
	struct ieee80211_bss *bss = (void *)cbss->priv;
1268
	struct ieee80211_local *local = sdata->local;
1269
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1270

Johannes Berg's avatar
Johannes Berg committed
1271
	bss_info_changed |= BSS_CHANGED_ASSOC;
1272
	bss_info_changed |= ieee80211_handle_bss_capability(sdata,