mlme.c 70.1 KB
Newer Older
1
2
3
4
5
6
7
8
9
10
11
12
13
/*
 * BSS client mode implementation
 * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
 * 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
19
20
21
#include <linux/if_ether.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/if_arp.h>
#include <linux/wireless.h>
#include <linux/random.h>
#include <linux/etherdevice.h>
22
#include <linux/rtnetlink.h>
23
24
#include <net/iw_handler.h>
#include <net/mac80211.h>
25
#include <asm/unaligned.h>
Johannes Berg's avatar
Johannes Berg committed
26

27
#include "ieee80211_i.h"
Johannes Berg's avatar
Johannes Berg committed
28
29
#include "rate.h"
#include "led.h"
30

31
#define IEEE80211_ASSOC_SCANS_MAX_TRIES 2
32
33
34
35
36
37
38
39
40
#define IEEE80211_AUTH_TIMEOUT (HZ / 5)
#define IEEE80211_AUTH_MAX_TRIES 3
#define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
#define IEEE80211_ASSOC_MAX_TRIES 3
#define IEEE80211_MONITORING_INTERVAL (2 * HZ)
#define IEEE80211_PROBE_INTERVAL (60 * HZ)
#define IEEE80211_RETRY_AUTH_INTERVAL (1 * HZ)
#define IEEE80211_SCAN_INTERVAL (2 * HZ)
#define IEEE80211_SCAN_INTERVAL_SLOW (15 * HZ)
41
#define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
42
43
44
45
46
47
48

#define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
#define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)

#define IEEE80211_IBSS_MAX_STA_ENTRIES 128


49
50
/* utils */
static int ecw2cw(int ecw)
Johannes Berg's avatar
Johannes Berg committed
51
{
52
	return (1 << ecw) - 1;
Johannes Berg's avatar
Johannes Berg committed
53
54
55
}

static u8 *ieee80211_bss_get_ie(struct ieee80211_sta_bss *bss, u8 ie)
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
{
	u8 *end, *pos;

	pos = bss->ies;
	if (pos == NULL)
		return NULL;
	end = pos + bss->ies_len;

	while (pos + 1 < end) {
		if (pos + 2 + pos[1] > end)
			break;
		if (pos[0] == ie)
			return pos;
		pos += 2 + pos[1];
	}

	return NULL;
}

75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
static int ieee80211_compatible_rates(struct ieee80211_sta_bss *bss,
				      struct ieee80211_supported_band *sband,
				      u64 *rates)
{
	int i, j, count;
	*rates = 0;
	count = 0;
	for (i = 0; i < bss->supp_rates_len; i++) {
		int rate = (bss->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;
}

Johannes Berg's avatar
Johannes Berg committed
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
/* frame sending functions */
static void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
				struct ieee80211_if_sta *ifsta,
				int transaction, u8 *extra, size_t extra_len,
				int encrypt)
{
	struct ieee80211_local *local = sdata->local;
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;

	skb = dev_alloc_skb(local->hw.extra_tx_headroom +
			    sizeof(*mgmt) + 6 + extra_len);
	if (!skb) {
		printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
		       "frame\n", sdata->dev->name);
		return;
	}
	skb_reserve(skb, local->hw.extra_tx_headroom);

	mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
	memset(mgmt, 0, 24 + 6);
	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
					  IEEE80211_STYPE_AUTH);
	if (encrypt)
		mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
	memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
	memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
	memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
	mgmt->u.auth.auth_alg = cpu_to_le16(ifsta->auth_alg);
	mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
	ifsta->auth_transaction = transaction + 1;
	mgmt->u.auth.status_code = cpu_to_le16(0);
	if (extra)
		memcpy(skb_put(skb, extra_len), extra, extra_len);

131
	ieee80211_tx_skb(sdata, skb, encrypt);
Johannes Berg's avatar
Johannes Berg committed
132
133
}

134
135
void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
			      u8 *ssid, size_t ssid_len)
Johannes Berg's avatar
Johannes Berg committed
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_supported_band *sband;
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;
	u8 *pos, *supp_rates, *esupp_rates = NULL;
	int i;

	skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200);
	if (!skb) {
		printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
		       "request\n", sdata->dev->name);
		return;
	}
	skb_reserve(skb, local->hw.extra_tx_headroom);

	mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
	memset(mgmt, 0, 24);
	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
					  IEEE80211_STYPE_PROBE_REQ);
	memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
	if (dst) {
		memcpy(mgmt->da, dst, ETH_ALEN);
		memcpy(mgmt->bssid, dst, ETH_ALEN);
	} else {
		memset(mgmt->da, 0xff, ETH_ALEN);
		memset(mgmt->bssid, 0xff, ETH_ALEN);
	}
	pos = skb_put(skb, 2 + ssid_len);
	*pos++ = WLAN_EID_SSID;
	*pos++ = ssid_len;
	memcpy(pos, ssid, ssid_len);

	supp_rates = skb_put(skb, 2);
	supp_rates[0] = WLAN_EID_SUPP_RATES;
	supp_rates[1] = 0;
	sband = local->hw.wiphy->bands[local->hw.conf.channel->band];

	for (i = 0; i < sband->n_bitrates; i++) {
		struct ieee80211_rate *rate = &sband->bitrates[i];
		if (esupp_rates) {
			pos = skb_put(skb, 1);
			esupp_rates[1]++;
		} else if (supp_rates[1] == 8) {
			esupp_rates = skb_put(skb, 3);
			esupp_rates[0] = WLAN_EID_EXT_SUPP_RATES;
			esupp_rates[1] = 1;
			pos = &esupp_rates[2];
		} else {
			pos = skb_put(skb, 1);
			supp_rates[1]++;
		}
		*pos = rate->bitrate / 5;
	}

191
	ieee80211_tx_skb(sdata, skb, 0);
Johannes Berg's avatar
Johannes Berg committed
192
193
}

194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
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
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
static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
				 struct ieee80211_if_sta *ifsta)
{
	struct ieee80211_local *local = sdata->local;
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;
	u8 *pos, *ies, *ht_add_ie;
	int i, len, count, rates_len, supp_rates_len;
	u16 capab;
	struct ieee80211_sta_bss *bss;
	int wmm = 0;
	struct ieee80211_supported_band *sband;
	u64 rates = 0;

	skb = dev_alloc_skb(local->hw.extra_tx_headroom +
			    sizeof(*mgmt) + 200 + ifsta->extra_ie_len +
			    ifsta->ssid_len);
	if (!skb) {
		printk(KERN_DEBUG "%s: failed to allocate buffer for assoc "
		       "frame\n", sdata->dev->name);
		return;
	}
	skb_reserve(skb, local->hw.extra_tx_headroom);

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

	capab = ifsta->capab;

	if (local->hw.conf.channel->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;
	}

	bss = ieee80211_rx_bss_get(local, ifsta->bssid,
				   local->hw.conf.channel->center_freq,
				   ifsta->ssid, ifsta->ssid_len);
	if (bss) {
		if (bss->capability & WLAN_CAPABILITY_PRIVACY)
			capab |= WLAN_CAPABILITY_PRIVACY;
		if (bss->wmm_used)
			wmm = 1;

		/* 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(bss, sband, &rates);

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

		ieee80211_rx_bss_put(local, bss);
	} else {
		rates = ~0;
		rates_len = sband->n_bitrates;
	}

	mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
	memset(mgmt, 0, 24);
	memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
	memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
	memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);

	if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) {
		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, ifsta->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.reassoc_req.listen_interval =
				cpu_to_le16(local->hw.conf.listen_interval);
	}

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

	len = sband->n_bitrates;
	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->hw.conf.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 (ifsta->extra_ie) {
		pos = skb_put(skb, ifsta->extra_ie_len);
		memcpy(pos, ifsta->extra_ie, ifsta->extra_ie_len);
	}

	if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
		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++ = 0;
	}

	/* wmm support is a must to HT */
	if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED) &&
	    sband->ht_info.ht_supported &&
	    (ht_add_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_EXTRA_INFO))) {
		struct ieee80211_ht_addt_info *ht_add_info =
			(struct ieee80211_ht_addt_info *)ht_add_ie;
		u16 cap = sband->ht_info.cap;
		__le16 tmp;
		u32 flags = local->hw.conf.channel->flags;

		switch (ht_add_info->ht_param & IEEE80211_HT_IE_CHA_SEC_OFFSET) {
		case IEEE80211_HT_IE_CHA_SEC_ABOVE:
			if (flags & IEEE80211_CHAN_NO_FAT_ABOVE) {
				cap &= ~IEEE80211_HT_CAP_SUP_WIDTH;
				cap &= ~IEEE80211_HT_CAP_SGI_40;
			}
			break;
		case IEEE80211_HT_IE_CHA_SEC_BELOW:
			if (flags & IEEE80211_CHAN_NO_FAT_BELOW) {
				cap &= ~IEEE80211_HT_CAP_SUP_WIDTH;
				cap &= ~IEEE80211_HT_CAP_SGI_40;
			}
			break;
		}

		tmp = cpu_to_le16(cap);
		pos = skb_put(skb, sizeof(struct ieee80211_ht_cap)+2);
		*pos++ = WLAN_EID_HT_CAPABILITY;
		*pos++ = sizeof(struct ieee80211_ht_cap);
		memset(pos, 0, sizeof(struct ieee80211_ht_cap));
		memcpy(pos, &tmp, sizeof(u16));
		pos += sizeof(u16);
		/* TODO: needs a define here for << 2 */
		*pos++ = sband->ht_info.ampdu_factor |
			 (sband->ht_info.ampdu_density << 2);
		memcpy(pos, sband->ht_info.supp_mcs_set, 16);
	}

	kfree(ifsta->assocreq_ies);
	ifsta->assocreq_ies_len = (skb->data + skb->len) - ies;
	ifsta->assocreq_ies = kmalloc(ifsta->assocreq_ies_len, GFP_KERNEL);
	if (ifsta->assocreq_ies)
		memcpy(ifsta->assocreq_ies, ies, ifsta->assocreq_ies_len);

399
	ieee80211_tx_skb(sdata, skb, 0);
400
401
402
}


403
404
static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
					   u16 stype, u16 reason)
405
406
{
	struct ieee80211_local *local = sdata->local;
407
	struct ieee80211_if_sta *ifsta = &sdata->u.sta;
408
409
410
411
412
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;

	skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
	if (!skb) {
413
414
		printk(KERN_DEBUG "%s: failed to allocate buffer for "
		       "deauth/disassoc frame\n", sdata->dev->name);
415
416
417
418
419
420
421
422
423
		return;
	}
	skb_reserve(skb, local->hw.extra_tx_headroom);

	mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
	memset(mgmt, 0, 24);
	memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
	memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
	memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
424
	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
425
	skb_put(skb, 2);
426
	/* u.deauth.reason_code == u.disassoc.reason_code */
427
428
	mgmt->u.deauth.reason_code = cpu_to_le16(reason);

429
	ieee80211_tx_skb(sdata, skb, 0);
430
431
}

Johannes Berg's avatar
Johannes Berg committed
432
/* MLME */
433
static void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
434
					 struct ieee80211_sta_bss *bss)
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
{
	struct ieee80211_local *local = sdata->local;
	int i, have_higher_than_11mbit = 0;

	/* cf. IEEE 802.11 9.2.12 */
	for (i = 0; i < bss->supp_rates_len; i++)
		if ((bss->supp_rates[i] & 0x7f) * 5 > 110)
			have_higher_than_11mbit = 1;

	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;

450
	ieee80211_set_wmm_default(sdata);
451
452
}

453
static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
454
455
456
457
458
459
460
461
				     struct ieee80211_if_sta *ifsta,
				     u8 *wmm_param, size_t wmm_param_len)
{
	struct ieee80211_tx_queue_params params;
	size_t left;
	int count;
	u8 *pos;

462
463
464
465
466
467
	if (!(ifsta->flags & IEEE80211_STA_WMM_ENABLED))
		return;

	if (!wmm_param)
		return;

468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
	if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
		return;
	count = wmm_param[6] & 0x0f;
	if (count == ifsta->wmm_last_param_set)
		return;
	ifsta->wmm_last_param_set = count;

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

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

	if (!local->ops->conf_tx)
		return;

	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) {
		case 1:
Johannes Berg's avatar
Johannes Berg committed
491
			queue = 3;
Johannes Berg's avatar
Johannes Berg committed
492
			if (acm)
493
494
495
				local->wmm_acm |= BIT(0) | BIT(3);
			break;
		case 2:
Johannes Berg's avatar
Johannes Berg committed
496
			queue = 1;
Johannes Berg's avatar
Johannes Berg committed
497
			if (acm)
498
499
500
				local->wmm_acm |= BIT(4) | BIT(5);
			break;
		case 3:
Johannes Berg's avatar
Johannes Berg committed
501
			queue = 0;
Johannes Berg's avatar
Johannes Berg committed
502
			if (acm)
503
504
505
506
				local->wmm_acm |= BIT(6) | BIT(7);
			break;
		case 0:
		default:
Johannes Berg's avatar
Johannes Berg committed
507
			queue = 2;
Johannes Berg's avatar
Johannes Berg committed
508
			if (acm)
509
510
511
512
513
514
515
				local->wmm_acm |= BIT(1) | BIT(2);
			break;
		}

		params.aifs = pos[0] & 0x0f;
		params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
		params.cw_min = ecw2cw(pos[1] & 0x0f);
516
		params.txop = get_unaligned_le16(pos + 2);
517
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
518
		printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
519
		       "cWmin=%d cWmax=%d txop=%d\n",
520
		       local->mdev->name, queue, aci, acm, params.aifs, params.cw_min,
521
522
		       params.cw_max, params.txop);
#endif
523
524
525
526
		/* TODO: handle ACM (block TX, fallback to next lowest allowed
		 * AC for now) */
		if (local->ops->conf_tx(local_to_hw(local), queue, &params)) {
			printk(KERN_DEBUG "%s: failed to set TX queue "
527
			       "parameters for queue %d\n", local->mdev->name, queue);
528
529
530
531
		}
	}
}

532
533
534
static u32 ieee80211_handle_protect_preamb(struct ieee80211_sub_if_data *sdata,
					   bool use_protection,
					   bool use_short_preamble)
535
{
536
	struct ieee80211_bss_conf *bss_conf = &sdata->bss_conf;
537
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
538
	struct ieee80211_if_sta *ifsta = &sdata->u.sta;
539
	DECLARE_MAC_BUF(mac);
540
#endif
541
	u32 changed = 0;
542

543
	if (use_protection != bss_conf->use_cts_prot) {
544
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
545
546
		if (net_ratelimit()) {
			printk(KERN_DEBUG "%s: CTS protection %s (BSSID="
547
			       "%s)\n",
548
			       sdata->dev->name,
549
			       use_protection ? "enabled" : "disabled",
550
			       print_mac(mac, ifsta->bssid));
551
		}
552
#endif
553
554
		bss_conf->use_cts_prot = use_protection;
		changed |= BSS_CHANGED_ERP_CTS_PROT;
555
	}
556

557
	if (use_short_preamble != bss_conf->use_short_preamble) {
558
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
559
560
		if (net_ratelimit()) {
			printk(KERN_DEBUG "%s: switched to %s barker preamble"
561
			       " (BSSID=%s)\n",
562
			       sdata->dev->name,
563
			       use_short_preamble ? "short" : "long",
564
			       print_mac(mac, ifsta->bssid));
565
		}
566
#endif
567
		bss_conf->use_short_preamble = use_short_preamble;
568
		changed |= BSS_CHANGED_ERP_PREAMBLE;
569
	}
570

571
	return changed;
572
573
}

574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
static u32 ieee80211_handle_erp_ie(struct ieee80211_sub_if_data *sdata,
				   u8 erp_value)
{
	bool use_protection = (erp_value & WLAN_ERP_USE_PROTECTION) != 0;
	bool use_short_preamble = (erp_value & WLAN_ERP_BARKER_PREAMBLE) == 0;

	return ieee80211_handle_protect_preamb(sdata,
			use_protection, use_short_preamble);
}

static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
					   struct ieee80211_sta_bss *bss)
{
	u32 changed = 0;

	if (bss->has_erp_value)
		changed |= ieee80211_handle_erp_ie(sdata, bss->erp_value);
	else {
		u16 capab = bss->capability;
		changed |= ieee80211_handle_protect_preamb(sdata, false,
				(capab & WLAN_CAPABILITY_SHORT_PREAMBLE) != 0);
	}

	return changed;
}

600
601
602
603
604
605
606
607
608
609
610
static void ieee80211_sta_send_apinfo(struct ieee80211_sub_if_data *sdata,
					struct ieee80211_if_sta *ifsta)
{
	union iwreq_data wrqu;
	memset(&wrqu, 0, sizeof(wrqu));
	if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
		memcpy(wrqu.ap_addr.sa_data, sdata->u.sta.bssid, ETH_ALEN);
	wrqu.ap_addr.sa_family = ARPHRD_ETHER;
	wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
}

611
static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata,
612
613
614
615
616
					 struct ieee80211_if_sta *ifsta)
{
	union iwreq_data wrqu;

	if (ifsta->assocreq_ies) {
617
618
		memset(&wrqu, 0, sizeof(wrqu));
		wrqu.data.length = ifsta->assocreq_ies_len;
619
		wireless_send_event(sdata->dev, IWEVASSOCREQIE, &wrqu,
620
				    ifsta->assocreq_ies);
621
	}
622
623
624
	if (ifsta->assocresp_ies) {
		memset(&wrqu, 0, sizeof(wrqu));
		wrqu.data.length = ifsta->assocresp_ies_len;
625
		wireless_send_event(sdata->dev, IWEVASSOCRESPIE, &wrqu,
626
				    ifsta->assocresp_ies);
627
628
629
630
	}
}


631
static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
632
				     struct ieee80211_if_sta *ifsta)
633
{
634
	struct ieee80211_local *local = sdata->local;
Tomas Winkler's avatar
Tomas Winkler committed
635
	struct ieee80211_conf *conf = &local_to_hw(local)->conf;
636
	u32 changed = BSS_CHANGED_ASSOC;
637

638
	struct ieee80211_sta_bss *bss;
639

640
	ifsta->flags |= IEEE80211_STA_ASSOCIATED;
641

642
643
	if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
		return;
644

645
646
647
648
649
650
651
652
	bss = ieee80211_rx_bss_get(local, ifsta->bssid,
				   conf->channel->center_freq,
				   ifsta->ssid, ifsta->ssid_len);
	if (bss) {
		/* set timing information */
		sdata->bss_conf.beacon_int = bss->beacon_int;
		sdata->bss_conf.timestamp = bss->timestamp;
		sdata->bss_conf.dtim_period = bss->dtim_period;
653

654
		changed |= ieee80211_handle_bss_capability(sdata, bss);
655
656

		ieee80211_rx_bss_put(local, bss);
657
658
	}

659
660
661
662
663
	if (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE) {
		changed |= BSS_CHANGED_HT;
		sdata->bss_conf.assoc_ht = 1;
		sdata->bss_conf.ht_conf = &conf->ht_conf;
		sdata->bss_conf.ht_bss_conf = &conf->ht_bss_conf;
664
	}
665

666
667
668
	ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
	memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN);
	ieee80211_sta_send_associnfo(sdata, ifsta);
669

670
671
	ifsta->last_probe = jiffies;
	ieee80211_led_assoc(local, 1);
672

673
674
	sdata->bss_conf.assoc = 1;
	ieee80211_bss_info_change_notify(sdata, changed);
675

676
677
	netif_tx_start_all_queues(sdata->dev);
	netif_carrier_on(sdata->dev);
678

679
	ieee80211_sta_send_apinfo(sdata, ifsta);
680
681
}

682
683
static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata,
				   struct ieee80211_if_sta *ifsta)
684
{
685
	DECLARE_MAC_BUF(mac);
686

687
688
689
690
691
	ifsta->direct_probe_tries++;
	if (ifsta->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
		printk(KERN_DEBUG "%s: direct probe to AP %s timed out\n",
		       sdata->dev->name, print_mac(mac, ifsta->bssid));
		ifsta->state = IEEE80211_STA_MLME_DISABLED;
692
693
694
		return;
	}

695
696
697
	printk(KERN_DEBUG "%s: direct probe to AP %s try %d\n",
			sdata->dev->name, print_mac(mac, ifsta->bssid),
			ifsta->direct_probe_tries);
698

699
	ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
700

701
702
703
704
705
706
707
708
709
	set_bit(IEEE80211_STA_REQ_DIRECT_PROBE, &ifsta->request);

	/* Direct probe is sent to broadcast address as some APs
	 * will not answer to direct packet in unassociated state.
	 */
	ieee80211_send_probe_req(sdata, NULL,
				 ifsta->ssid, ifsta->ssid_len);

	mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
Johannes Berg's avatar
Johannes Berg committed
710
}
711

712
713
714

static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
				   struct ieee80211_if_sta *ifsta)
715
{
716
	DECLARE_MAC_BUF(mac);
717

718
719
720
721
722
723
	ifsta->auth_tries++;
	if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
		printk(KERN_DEBUG "%s: authentication with AP %s"
		       " timed out\n",
		       sdata->dev->name, print_mac(mac, ifsta->bssid));
		ifsta->state = IEEE80211_STA_MLME_DISABLED;
724
725
726
		return;
	}

727
728
729
	ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
	printk(KERN_DEBUG "%s: authenticate with AP %s\n",
	       sdata->dev->name, print_mac(mac, ifsta->bssid));
730

731
732
733
	ieee80211_send_auth(sdata, ifsta, 1, NULL, 0, 0);

	mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
734
735
}

736
737
738
739
740
741
static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
				   struct ieee80211_if_sta *ifsta, bool deauth,
				   bool self_disconnected, u16 reason)
{
	struct ieee80211_local *local = sdata->local;
	struct sta_info *sta;
742
	u32 changed = BSS_CHANGED_ASSOC;
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758

	rcu_read_lock();

	sta = sta_info_get(local, ifsta->bssid);
	if (!sta) {
		rcu_read_unlock();
		return;
	}

	if (deauth) {
		ifsta->direct_probe_tries = 0;
		ifsta->auth_tries = 0;
	}
	ifsta->assoc_scan_tries = 0;
	ifsta->assoc_tries = 0;

759
	netif_tx_stop_all_queues(sdata->dev);
760
761
762
763
764
765
	netif_carrier_off(sdata->dev);

	ieee80211_sta_tear_down_BA_sessions(sdata, sta->addr);

	if (self_disconnected) {
		if (deauth)
766
767
			ieee80211_send_deauth_disassoc(sdata,
				IEEE80211_STYPE_DEAUTH, reason);
768
		else
769
770
			ieee80211_send_deauth_disassoc(sdata,
				IEEE80211_STYPE_DISASSOC, reason);
771
772
	}

773
774
775
776
777
778
779
780
781
782
783
784
785
786
	ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
	changed |= ieee80211_reset_erp_info(sdata);

	if (sdata->bss_conf.assoc_ht)
		changed |= BSS_CHANGED_HT;

	sdata->bss_conf.assoc_ht = 0;
	sdata->bss_conf.ht_conf = NULL;
	sdata->bss_conf.ht_bss_conf = NULL;

	ieee80211_led_assoc(local, 0);
	sdata->bss_conf.assoc = 0;

	ieee80211_sta_send_apinfo(sdata, ifsta);
787
788
789
790
791
792
793
794
795
796

	if (self_disconnected)
		ifsta->state = IEEE80211_STA_MLME_DISABLED;

	sta_info_unlink(&sta);

	rcu_read_unlock();

	sta_info_destroy(sta);
}
797

798
799
800
801
802
803
804
805
static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
{
	if (!sdata || !sdata->default_key ||
	    sdata->default_key->conf.alg != ALG_WEP)
		return 0;
	return 1;
}

806
static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata,
807
808
				      struct ieee80211_if_sta *ifsta)
{
809
	struct ieee80211_local *local = sdata->local;
810
	struct ieee80211_sta_bss *bss;
811
812
813
	int bss_privacy;
	int wep_privacy;
	int privacy_invoked;
814

815
	if (!ifsta || (ifsta->flags & IEEE80211_STA_MIXED_CELL))
816
817
		return 0;

818
	bss = ieee80211_rx_bss_get(local, ifsta->bssid,
819
				   local->hw.conf.channel->center_freq,
820
				   ifsta->ssid, ifsta->ssid_len);
821
822
823
	if (!bss)
		return 0;

824
	bss_privacy = !!(bss->capability & WLAN_CAPABILITY_PRIVACY);
825
	wep_privacy = !!ieee80211_sta_wep_configured(sdata);
826
	privacy_invoked = !!(ifsta->flags & IEEE80211_STA_PRIVACY_INVOKED);
827

828
	ieee80211_rx_bss_put(local, bss);
829

830
831
832
833
	if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
		return 0;

	return 1;
834
835
}

836
static void ieee80211_associate(struct ieee80211_sub_if_data *sdata,
837
838
				struct ieee80211_if_sta *ifsta)
{
839
840
	DECLARE_MAC_BUF(mac);

841
842
	ifsta->assoc_tries++;
	if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
843
		printk(KERN_DEBUG "%s: association with AP %s"
844
		       " timed out\n",
845
		       sdata->dev->name, print_mac(mac, ifsta->bssid));
846
		ifsta->state = IEEE80211_STA_MLME_DISABLED;
847
848
849
		return;
	}

850
	ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
851
	printk(KERN_DEBUG "%s: associate with AP %s\n",
852
853
	       sdata->dev->name, print_mac(mac, ifsta->bssid));
	if (ieee80211_privacy_mismatch(sdata, ifsta)) {
854
		printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
855
		       "mixed-cell disabled - abort association\n", sdata->dev->name);
856
		ifsta->state = IEEE80211_STA_MLME_DISABLED;
857
858
859
		return;
	}

860
	ieee80211_send_assoc(sdata, ifsta);
861
862
863
864
865

	mod_timer(&ifsta->timer, jiffies + IEEE80211_ASSOC_TIMEOUT);
}


866
static void ieee80211_associated(struct ieee80211_sub_if_data *sdata,
867
868
				 struct ieee80211_if_sta *ifsta)
{
869
	struct ieee80211_local *local = sdata->local;
870
871
	struct sta_info *sta;
	int disassoc;
872
	DECLARE_MAC_BUF(mac);
873
874
875
876
877
878

	/* TODO: start monitoring current AP signal quality and number of
	 * missed beacons. Scan other channels every now and then and search
	 * for better APs. */
	/* TODO: remove expired BSSes */

879
	ifsta->state = IEEE80211_STA_MLME_ASSOCIATED;
880

881
882
	rcu_read_lock();

883
884
	sta = sta_info_get(local, ifsta->bssid);
	if (!sta) {
885
		printk(KERN_DEBUG "%s: No STA entry for own AP %s\n",
886
		       sdata->dev->name, print_mac(mac, ifsta->bssid));
887
888
889
890
891
		disassoc = 1;
	} else {
		disassoc = 0;
		if (time_after(jiffies,
			       sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
892
			if (ifsta->flags & IEEE80211_STA_PROBEREQ_POLL) {
893
				printk(KERN_DEBUG "%s: No ProbeResp from "
894
				       "current AP %s - assume out of "
895
				       "range\n",
896
				       sdata->dev->name, print_mac(mac, ifsta->bssid));
897
				disassoc = 1;
898
			} else
899
				ieee80211_send_probe_req(sdata, ifsta->bssid,
900
901
							 local->scan_ssid,
							 local->scan_ssid_len);
902
			ifsta->flags ^= IEEE80211_STA_PROBEREQ_POLL;
903
		} else {
904
			ifsta->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
905
906
907
			if (time_after(jiffies, ifsta->last_probe +
				       IEEE80211_PROBE_INTERVAL)) {
				ifsta->last_probe = jiffies;
908
				ieee80211_send_probe_req(sdata, ifsta->bssid,
909
910
911
912
913
							 ifsta->ssid,
							 ifsta->ssid_len);
			}
		}
	}
914
915
916

	rcu_read_unlock();

Johannes Berg's avatar
Johannes Berg committed
917
918
919
920
921
922
	if (disassoc)
		ieee80211_set_disassoc(sdata, ifsta, true, true,
					WLAN_REASON_PREV_AUTH_NOT_VALID);
	else
		mod_timer(&ifsta->timer, jiffies +
				      IEEE80211_MONITORING_INTERVAL);
923
924
925
}


926
static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata,
927
928
				     struct ieee80211_if_sta *ifsta)
{
929
	printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
930
	ifsta->flags |= IEEE80211_STA_AUTHENTICATED;
931
	ieee80211_associate(sdata, ifsta);
932
933
934
}


935
static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
936
937
938
939
940
941
942
943
				     struct ieee80211_if_sta *ifsta,
				     struct ieee80211_mgmt *mgmt,
				     size_t len)
{
	u8 *pos;
	struct ieee802_11_elems elems;

	pos = mgmt->u.auth.variable;
944
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
945
	if (!elems.challenge)
946
		return;
947
	ieee80211_send_auth(sdata, ifsta, 3, elems.challenge - 2,
948
949
950
			    elems.challenge_len + 2, 1);
}

951
static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
952
953
954
955
956
				   struct ieee80211_if_sta *ifsta,
				   struct ieee80211_mgmt *mgmt,
				   size_t len)
{
	u16 auth_alg, auth_transaction, status_code;
957
	DECLARE_MAC_BUF(mac);
958

959
	if (ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
960
	    sdata->vif.type != IEEE80211_IF_TYPE_IBSS)
961
962
		return;

963
	if (len < 24 + 6)
964
965
		return;

966
	if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
967
	    memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
968
969
		return;

970
	if (sdata->vif.type != IEEE80211_IF_TYPE_IBSS &&
971
	    memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
972
973
974
975
976
977
		return;

	auth_alg = le16_to_cpu(mgmt->u.auth.auth_alg);
	auth_transaction = le16_to_cpu(mgmt->u.auth.auth_transaction);
	status_code = le16_to_cpu(mgmt->u.auth.status_code);

978
	if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
979
980
		/*
		 * IEEE 802.11 standard does not require authentication in IBSS
981
982
983
		 * networks and most implementations do not seem to use it.
		 * However, try to reply to authentication attempts if someone
		 * has actually implemented this.
984
		 */
985
		if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
986
			return;
987
		ieee80211_send_auth(sdata, ifsta, 2, NULL, 0, 0);
988
989
990
	}

	if (auth_alg != ifsta->auth_alg ||
991
	    auth_transaction != ifsta->auth_transaction)
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
		return;

	if (status_code != WLAN_STATUS_SUCCESS) {
		if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
			u8 algs[3];
			const int num_algs = ARRAY_SIZE(algs);
			int i, pos;
			algs[0] = algs[1] = algs[2] = 0xff;
			if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
				algs[0] = WLAN_AUTH_OPEN;
			if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
				algs[1] = WLAN_AUTH_SHARED_KEY;
			if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
				algs[2] = WLAN_AUTH_LEAP;
			if (ifsta->auth_alg == WLAN_AUTH_OPEN)
				pos = 0;
			else if (ifsta->auth_alg == WLAN_AUTH_SHARED_KEY)
				pos = 1;
			else
				pos = 2;
			for (i = 0; i < num_algs; i++) {
				pos++;
				if (pos >= num_algs)
					pos = 0;
				if (algs[pos] == ifsta->auth_alg ||
				    algs[pos] == 0xff)
					continue;
				if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1020
				    !ieee80211_sta_wep_configured(sdata))
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
					continue;
				ifsta->auth_alg = algs[pos];
				break;
			}
		}
		return;
	}

	switch (ifsta->auth_alg) {
	case WLAN_AUTH_OPEN:
	case WLAN_AUTH_LEAP:
1032
		ieee80211_auth_completed(sdata, ifsta);
1033
1034
1035
		break;
	case WLAN_AUTH_SHARED_KEY:
		if (ifsta->auth_transaction == 4)
1036
			ieee80211_auth_completed(sdata, ifsta);
1037
		else
1038
			ieee80211_auth_challenge(sdata, ifsta, mgmt, len);
1039
1040
1041
1042
1043
		break;
	}
}


1044
static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1045
1046
1047
1048
1049
				     struct ieee80211_if_sta *ifsta,
				     struct ieee80211_mgmt *mgmt,
				     size_t len)
{
	u16 reason_code;
1050
	DECLARE_MAC_BUF(mac);
1051

1052
	if (len < 24 + 2)
1053
1054
		return;

1055
	if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1056
1057
1058
1059
		return;

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

Johannes Berg's avatar
Johannes Berg committed
1060
	if (ifsta->flags & IEEE80211_STA_AUTHENTICATED)
1061
		printk(KERN_DEBUG "%s: deauthenticated\n", sdata->dev->name);
1062

1063
1064
1065
	if (ifsta->state == IEEE80211_STA_MLME_AUTHENTICATE ||
	    ifsta->state == IEEE80211_STA_MLME_ASSOCIATE ||
	    ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
1066
		ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
1067
1068
1069
1070
		mod_timer(&ifsta->timer, jiffies +
				      IEEE80211_RETRY_AUTH_INTERVAL);
	}

1071
	ieee80211_set_disassoc(sdata, ifsta, true, false, 0);
1072
	ifsta->flags &= ~IEEE80211_STA_AUTHENTICATED;
1073
1074
1075
}


1076
static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1077
1078
1079
1080
1081
				       struct ieee80211_if_sta *ifsta,
				       struct ieee80211_mgmt *mgmt,
				       size_t len)
{
	u16 reason_code;
1082
	DECLARE_MAC_BUF(mac);
1083

1084
	if (len < 24 + 2)
1085
1086
		return;

1087
	if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN))
1088
1089
1090
1091
		return;

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

1092
	if (ifsta->flags & IEEE80211_STA_ASSOCIATED)
1093
		printk(KERN_DEBUG "%s: disassociated\n", sdata->dev->name);
1094

1095
1096
	if (ifsta->state == IEEE80211_STA_MLME_ASSOCIATED) {
		ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
1097
1098
1099
1100
		mod_timer(&ifsta->timer, jiffies +
				      IEEE80211_RETRY_AUTH_INTERVAL);
	}

1101
	ieee80211_set_disassoc(sdata, ifsta, false, false, 0);
1102
1103
1104
}


1105
static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
1106
1107
1108
1109
1110
					 struct ieee80211_if_sta *ifsta,
					 struct ieee80211_mgmt *mgmt,
					 size_t len,
					 int reassoc)
{
1111
	struct ieee80211_local *local = sdata->local;
1112
	struct ieee80211_supported_band *sband;
1113
	struct sta_info *sta;
1114
	u64 rates, basic_rates;
1115
1116
	u16 capab_info, status_code, aid;
	struct ieee802_11_elems elems;
1117
	struct ieee80211_bss_conf *bss_conf = &sdata->bss_conf;
1118
1119
	u8 *pos;
	int i, j;
1120
	DECLARE_MAC_BUF(mac);
1121
	bool have_higher_than_11mbit = false;
1122
1123
1124
1125

	/* AssocResp and ReassocResp have identical structure, so process both
	 * of them in this function. */

1126
	if (ifsta->state != IEEE80211_STA_MLME_ASSOCIATE)
1127
1128
		return;

1129
	if (len < 24 + 6)
1130
1131
		return;

1132
	if (memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1133
1134
1135
1136
1137
1138
		return;

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

1139
	printk(KERN_DEBUG "%s: RX %sssocResp from %s (capab=0x%x "
1140
	       "status=%d aid=%d)\n",
1141
	       sdata->dev->name, reassoc ? "Rea" : "A", print_mac(mac, mgmt->sa),
1142
	       capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
1143
1144
1145

	if (status_code != WLAN_STATUS_SUCCESS) {
		printk(KERN_DEBUG "%s: AP denied association (code=%d)\n",
1146
		       sdata->dev->name, status_code);
1147
1148
1149
		/* if this was a reassociation, ensure we try a "full"
		 * association next time. This works around some broken APs
		 * which do not correctly reject reassociation requests. */
1150
		ifsta->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
1151
1152
1153
		return;
	}

1154
1155
	if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
		printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1156
		       "set\n", sdata->dev->name, aid);
1157
1158
	aid &= ~(BIT(15) | BIT(14));

1159
	pos = mgmt->u.assoc_resp.variable;
1160
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1161
1162
1163

	if (!elems.supp_rates) {
		printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1164
		       sdata->dev->name);
1165
1166
1167
		return;
	}

1168
	printk(KERN_DEBUG "%s: associated\n", sdata->dev->name);
1169
1170
1171
1172
1173
	ifsta->aid = aid;
	ifsta->ap_capab = capab_info;

	kfree(ifsta->assocresp_ies);
	ifsta->assocresp_ies_len = len - (pos - (u8 *) mgmt);