mlme.c 119 KB
Newer Older
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
/*
 * 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.
 */

/* TODO:
 * order BSS list by RSSI(?) ("quality of AP")
 * scan result table filtering (by capability (privacy, IBSS/BSS, WPA/RSN IE,
 *    SSID)
 */
19
#include <linux/delay.h>
20
21
22
23
24
25
26
#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>
27
#include <linux/rtnetlink.h>
28
29
30
31
32
#include <net/iw_handler.h>
#include <asm/types.h>

#include <net/mac80211.h>
#include "ieee80211_i.h"
Johannes Berg's avatar
Johannes Berg committed
33
34
#include "rate.h"
#include "led.h"
35
#include "mesh.h"
36

37
#define IEEE80211_ASSOC_SCANS_MAX_TRIES 2
38
39
40
41
42
#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)
43
#define IEEE80211_MESH_HOUSEKEEPING_INTERVAL (60 * HZ)
44
45
46
47
#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)
48
#define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
49
50
51
52
53
54
55

#define IEEE80211_PROBE_DELAY (HZ / 33)
#define IEEE80211_CHANNEL_TIME (HZ / 33)
#define IEEE80211_PASSIVE_CHANNEL_TIME (HZ / 5)
#define IEEE80211_SCAN_RESULT_EXPIRE (10 * HZ)
#define IEEE80211_IBSS_MERGE_INTERVAL (30 * HZ)
#define IEEE80211_IBSS_INACTIVITY_LIMIT (60 * HZ)
56
#define IEEE80211_MESH_PEER_INACTIVITY_LIMIT (1800 * HZ)
57
58
59
60
61
62

#define IEEE80211_IBSS_MAX_STA_ENTRIES 128


#define ERP_INFO_USE_PROTECTION BIT(1)

63
/* mgmt header + 1 byte category code */
64
65
66
67
68
#define IEEE80211_MIN_ACTION_SIZE (24 + 1)

#define IEEE80211_ADDBA_PARAM_POLICY_MASK 0x0002
#define IEEE80211_ADDBA_PARAM_TID_MASK 0x003C
#define IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK 0xFFA0
69
70
#define IEEE80211_DELBA_PARAM_TID_MASK 0xF000
#define IEEE80211_DELBA_PARAM_INITIATOR_MASK 0x0800
71

72
73
74
75
76
/* next values represent the buffer size for A-MPDU frame.
 * According to IEEE802.11n spec size varies from 8K to 64K (in powers of 2) */
#define IEEE80211_MIN_AMPDU_BUF 0x8
#define IEEE80211_MAX_AMPDU_BUF 0x40

77
static void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
78
79
				     u8 *ssid, size_t ssid_len);
static struct ieee80211_sta_bss *
80
ieee80211_rx_bss_get(struct ieee80211_local *local, u8 *bssid, int freq,
81
		     u8 *ssid, u8 ssid_len);
82
static void ieee80211_rx_bss_put(struct ieee80211_local *local,
83
				 struct ieee80211_sta_bss *bss);
84
static int ieee80211_sta_find_ibss(struct ieee80211_sub_if_data *sdata,
85
				   struct ieee80211_if_sta *ifsta);
86
87
static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata);
static int ieee80211_sta_start_scan(struct ieee80211_sub_if_data *sdata,
88
				    u8 *ssid, size_t ssid_len);
89
static int ieee80211_sta_config_auth(struct ieee80211_sub_if_data *sdata,
90
				     struct ieee80211_if_sta *ifsta);
91
static void sta_rx_agg_session_timer_expired(unsigned long data);
92
93


94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
static u8 * ieee80211_bss_get_ie(struct ieee80211_sta_bss *bss, u8 ie)
{
	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;
}


115
116
static int ecw2cw(int ecw)
{
117
	return (1 << ecw) - 1;
118
119
}

120

121
static void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
					 struct ieee80211_sta_bss *bss,
					 int ibss)
{
	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;


	if (local->ops->conf_tx) {
		struct ieee80211_tx_queue_params qparam;

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

		qparam.aifs = 2;

		if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
		    !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE))
			qparam.cw_min = 31;
		else
			qparam.cw_min = 15;

		qparam.cw_max = 1023;
		qparam.txop = 0;

Johannes Berg's avatar
Johannes Berg committed
157
158
		for (i = 0; i < local_to_hw(local)->queues; i++)
			local->ops->conf_tx(local_to_hw(local), i, &qparam);
159
160
161
	}
}

162
static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
163
164
165
166
167
168
169
170
				     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;

171
172
173
174
175
176
	if (!(ifsta->flags & IEEE80211_STA_WMM_ENABLED))
		return;

	if (!wmm_param)
		return;

177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
	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
200
			queue = 3;
Johannes Berg's avatar
Johannes Berg committed
201
			if (acm)
202
203
204
				local->wmm_acm |= BIT(0) | BIT(3);
			break;
		case 2:
Johannes Berg's avatar
Johannes Berg committed
205
			queue = 1;
Johannes Berg's avatar
Johannes Berg committed
206
			if (acm)
207
208
209
				local->wmm_acm |= BIT(4) | BIT(5);
			break;
		case 3:
Johannes Berg's avatar
Johannes Berg committed
210
			queue = 0;
Johannes Berg's avatar
Johannes Berg committed
211
			if (acm)
212
213
214
215
				local->wmm_acm |= BIT(6) | BIT(7);
			break;
		case 0:
		default:
Johannes Berg's avatar
Johannes Berg committed
216
			queue = 2;
Johannes Berg's avatar
Johannes Berg committed
217
			if (acm)
218
219
220
221
222
223
224
				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);
225
		params.txop = get_unaligned_le16(pos + 2);
226
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
227
		printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
228
		       "cWmin=%d cWmax=%d txop=%d\n",
229
		       local->mdev->name, queue, aci, acm, params.aifs, params.cw_min,
230
231
		       params.cw_max, params.txop);
#endif
232
233
234
235
		/* 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 "
236
			       "parameters for queue %d\n", local->mdev->name, queue);
237
238
239
240
		}
	}
}

241
242
243
static u32 ieee80211_handle_protect_preamb(struct ieee80211_sub_if_data *sdata,
					   bool use_protection,
					   bool use_short_preamble)
244
{
245
	struct ieee80211_bss_conf *bss_conf = &sdata->bss_conf;
246
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
247
	struct ieee80211_if_sta *ifsta = &sdata->u.sta;
248
	DECLARE_MAC_BUF(mac);
249
#endif
250
	u32 changed = 0;
251

252
	if (use_protection != bss_conf->use_cts_prot) {
253
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
254
255
		if (net_ratelimit()) {
			printk(KERN_DEBUG "%s: CTS protection %s (BSSID="
256
			       "%s)\n",
257
			       sdata->dev->name,
258
			       use_protection ? "enabled" : "disabled",
259
			       print_mac(mac, ifsta->bssid));
260
		}
261
#endif
262
263
		bss_conf->use_cts_prot = use_protection;
		changed |= BSS_CHANGED_ERP_CTS_PROT;
264
	}
265

266
	if (use_short_preamble != bss_conf->use_short_preamble) {
267
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
268
269
		if (net_ratelimit()) {
			printk(KERN_DEBUG "%s: switched to %s barker preamble"
270
			       " (BSSID=%s)\n",
271
			       sdata->dev->name,
272
			       use_short_preamble ? "short" : "long",
273
			       print_mac(mac, ifsta->bssid));
274
		}
275
#endif
276
		bss_conf->use_short_preamble = use_short_preamble;
277
		changed |= BSS_CHANGED_ERP_PREAMBLE;
278
	}
279

280
	return changed;
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
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;
}

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
int ieee80211_ht_cap_ie_to_ht_info(struct ieee80211_ht_cap *ht_cap_ie,
				   struct ieee80211_ht_info *ht_info)
{

	if (ht_info == NULL)
		return -EINVAL;

	memset(ht_info, 0, sizeof(*ht_info));

	if (ht_cap_ie) {
		u8 ampdu_info = ht_cap_ie->ampdu_params_info;

		ht_info->ht_supported = 1;
		ht_info->cap = le16_to_cpu(ht_cap_ie->cap_info);
		ht_info->ampdu_factor =
			ampdu_info & IEEE80211_HT_CAP_AMPDU_FACTOR;
		ht_info->ampdu_density =
			(ampdu_info & IEEE80211_HT_CAP_AMPDU_DENSITY) >> 2;
		memcpy(ht_info->supp_mcs_set, ht_cap_ie->supp_mcs_set, 16);
	} else
		ht_info->ht_supported = 0;

	return 0;
}

int ieee80211_ht_addt_info_ie_to_ht_bss_info(
			struct ieee80211_ht_addt_info *ht_add_info_ie,
			struct ieee80211_ht_bss_info *bss_info)
{
	if (bss_info == NULL)
		return -EINVAL;

	memset(bss_info, 0, sizeof(*bss_info));

	if (ht_add_info_ie) {
		u16 op_mode;
		op_mode = le16_to_cpu(ht_add_info_ie->operation_mode);

		bss_info->primary_channel = ht_add_info_ie->control_chan;
		bss_info->bss_cap = ht_add_info_ie->ht_param;
		bss_info->bss_op_mode = (u8)(op_mode & 0xff);
	}

	return 0;
}
354

355
static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata,
356
357
358
359
360
					 struct ieee80211_if_sta *ifsta)
{
	union iwreq_data wrqu;

	if (ifsta->assocreq_ies) {
361
362
		memset(&wrqu, 0, sizeof(wrqu));
		wrqu.data.length = ifsta->assocreq_ies_len;
363
		wireless_send_event(sdata->dev, IWEVASSOCREQIE, &wrqu,
364
				    ifsta->assocreq_ies);
365
	}
366
367
368
	if (ifsta->assocresp_ies) {
		memset(&wrqu, 0, sizeof(wrqu));
		wrqu.data.length = ifsta->assocresp_ies_len;
369
		wireless_send_event(sdata->dev, IWEVASSOCRESPIE, &wrqu,
370
				    ifsta->assocresp_ies);
371
372
373
374
	}
}


375
static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
376
				     struct ieee80211_if_sta *ifsta,
377
				     bool assoc)
378
{
379
	struct ieee80211_local *local = sdata->local;
Tomas Winkler's avatar
Tomas Winkler committed
380
	struct ieee80211_conf *conf = &local_to_hw(local)->conf;
381
	union iwreq_data wrqu;
382
	u32 changed = BSS_CHANGED_ASSOC;
383
384

	if (assoc) {
385
		struct ieee80211_sta_bss *bss;
386
387
388

		ifsta->flags |= IEEE80211_STA_ASSOCIATED;

389
		if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
390
			return;
391

392
		bss = ieee80211_rx_bss_get(local, ifsta->bssid,
Tomas Winkler's avatar
Tomas Winkler committed
393
					   conf->channel->center_freq,
394
					   ifsta->ssid, ifsta->ssid_len);
395
		if (bss) {
396
397
398
			/* set timing information */
			sdata->bss_conf.beacon_int = bss->beacon_int;
			sdata->bss_conf.timestamp = bss->timestamp;
399
			sdata->bss_conf.dtim_period = bss->dtim_period;
400

401
			changed |= ieee80211_handle_bss_capability(sdata, bss);
402

403
			ieee80211_rx_bss_put(local, bss);
404
405
		}

Tomas Winkler's avatar
Tomas Winkler committed
406
407
408
409
410
411
412
		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;
		}

413
		ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
414
415
		memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN);
		memcpy(wrqu.ap_addr.sa_data, sdata->u.sta.bssid, ETH_ALEN);
416
		ieee80211_sta_send_associnfo(sdata, ifsta);
417
	} else {
418
419
		netif_carrier_off(sdata->dev);
		ieee80211_sta_tear_down_BA_sessions(sdata, ifsta->bssid);
420
		ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
421
		changed |= ieee80211_reset_erp_info(sdata);
Tomas Winkler's avatar
Tomas Winkler committed
422
423
424
425
426

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

427
428
429
		memset(wrqu.ap_addr.sa_data, 0, ETH_ALEN);
	}
	ifsta->last_probe = jiffies;
430
	ieee80211_led_assoc(local, assoc);
431

432
	sdata->bss_conf.assoc = assoc;
433
	ieee80211_bss_info_change_notify(sdata, changed);
434
435

	if (assoc)
436
		netif_carrier_on(sdata->dev);
437

438
	wrqu.ap_addr.sa_family = ARPHRD_ETHER;
439
	wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
440
441
}

442
static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
443
444
				   struct ieee80211_if_sta *ifsta, int deauth)
{
445
446
	if (deauth) {
		ifsta->direct_probe_tries = 0;
447
		ifsta->auth_tries = 0;
448
	}
449
	ifsta->assoc_scan_tries = 0;
450
	ifsta->assoc_tries = 0;
451
	ieee80211_set_associated(sdata, ifsta, 0);
452
453
}

454
void ieee80211_sta_tx(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
455
		      int encrypt)
456
457
458
459
460
461
{
	skb->dev = sdata->local->mdev;
	skb_set_mac_header(skb, 0);
	skb_set_network_header(skb, 0);
	skb_set_transport_header(skb, 0);

462
463
	skb->iif = sdata->dev->ifindex;
	skb->do_not_encrypt = !encrypt;
464
465
466
467
468

	dev_queue_xmit(skb);
}


469
static void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
470
471
472
473
				struct ieee80211_if_sta *ifsta,
				int transaction, u8 *extra, size_t extra_len,
				int encrypt)
{
474
	struct ieee80211_local *local = sdata->local;
475
476
477
478
479
480
481
	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 "
482
		       "frame\n", sdata->dev->name);
483
484
485
486
487
488
		return;
	}
	skb_reserve(skb, local->hw.extra_tx_headroom);

	mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
	memset(mgmt, 0, 24 + 6);
489
490
	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
					  IEEE80211_STYPE_AUTH);
491
492
493
	if (encrypt)
		mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
	memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
494
	memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
495
496
497
498
499
500
501
502
	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);

503
	ieee80211_sta_tx(sdata, skb, encrypt);
504
505
}

506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata,
				   struct ieee80211_if_sta *ifsta)
{
	DECLARE_MAC_BUF(mac);

	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;
		return;
	}

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

	ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;

	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);
}

536

537
static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
538
539
				   struct ieee80211_if_sta *ifsta)
{
540
541
	DECLARE_MAC_BUF(mac);

542
543
	ifsta->auth_tries++;
	if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
544
		printk(KERN_DEBUG "%s: authentication with AP %s"
545
		       " timed out\n",
546
		       sdata->dev->name, print_mac(mac, ifsta->bssid));
547
		ifsta->state = IEEE80211_STA_MLME_DISABLED;
548
549
550
		return;
	}

551
	ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
552
	printk(KERN_DEBUG "%s: authenticate with AP %s\n",
553
	       sdata->dev->name, print_mac(mac, ifsta->bssid));
554

555
	ieee80211_send_auth(sdata, ifsta, 1, NULL, 0, 0);
556
557
558
559

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

560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
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;
}
580

581
static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata,
582
583
				 struct ieee80211_if_sta *ifsta)
{
584
	struct ieee80211_local *local = sdata->local;
585
586
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;
587
	u8 *pos, *ies, *ht_add_ie;
588
	int i, len, count, rates_len, supp_rates_len;
589
590
591
	u16 capab;
	struct ieee80211_sta_bss *bss;
	int wmm = 0;
592
	struct ieee80211_supported_band *sband;
593
	u64 rates = 0;
594
595
596
597
598
599

	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 "
600
		       "frame\n", sdata->dev->name);
601
602
603
604
		return;
	}
	skb_reserve(skb, local->hw.extra_tx_headroom);

605
606
	sband = local->hw.wiphy->bands[local->hw.conf.channel->band];

607
	capab = ifsta->capab;
608
609
610
611
612
613

	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;
614
	}
615

616
	bss = ieee80211_rx_bss_get(local, ifsta->bssid,
617
				   local->hw.conf.channel->center_freq,
618
				   ifsta->ssid, ifsta->ssid_len);
619
620
621
	if (bss) {
		if (bss->capability & WLAN_CAPABILITY_PRIVACY)
			capab |= WLAN_CAPABILITY_PRIVACY;
622
		if (bss->wmm_used)
623
			wmm = 1;
624
625
626
627
628
629
630

		/* 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);

631
632
633
634
		if ((bss->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
		    (local->hw.flags & IEEE80211_HW_SPECTRUM_MGMT))
			capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;

635
		ieee80211_rx_bss_put(local, bss);
636
637
638
	} else {
		rates = ~0;
		rates_len = sband->n_bitrates;
639
640
641
642
643
	}

	mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
	memset(mgmt, 0, 24);
	memcpy(mgmt->da, ifsta->bssid, ETH_ALEN);
644
	memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
645
646
	memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);

647
	if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) {
648
		skb_put(skb, 10);
649
650
		mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
						  IEEE80211_STYPE_REASSOC_REQ);
651
		mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
652
653
		mgmt->u.reassoc_req.listen_interval =
				cpu_to_le16(local->hw.conf.listen_interval);
654
655
656
657
		memcpy(mgmt->u.reassoc_req.current_ap, ifsta->prev_bssid,
		       ETH_ALEN);
	} else {
		skb_put(skb, 4);
658
659
		mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
						  IEEE80211_STYPE_ASSOC_REQ);
660
		mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
661
662
		mgmt->u.reassoc_req.listen_interval =
				cpu_to_le16(local->hw.conf.listen_interval);
663
664
665
666
667
668
669
670
	}

	/* 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);

671
	/* add all rates which were marked to be used above */
672
673
674
675
	supp_rates_len = rates_len;
	if (supp_rates_len > 8)
		supp_rates_len = 8;

676
	len = sband->n_bitrates;
677
	pos = skb_put(skb, supp_rates_len + 2);
678
	*pos++ = WLAN_EID_SUPP_RATES;
679
	*pos++ = supp_rates_len;
680

681
682
683
	count = 0;
	for (i = 0; i < sband->n_bitrates; i++) {
		if (BIT(i) & rates) {
684
			int rate = sband->bitrates[i].bitrate;
685
			*pos++ = (u8) (rate / 5);
686
687
688
689
690
			if (++count == 8)
				break;
		}
	}

691
	if (rates_len > count) {
692
693
694
695
696
697
698
699
700
		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);
			}
701
702
703
		}
	}

704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
	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*/
		}
	}

724
725
726
727
728
	if (ifsta->extra_ie) {
		pos = skb_put(skb, ifsta->extra_ie_len);
		memcpy(pos, ifsta->extra_ie, ifsta->extra_ie_len);
	}

729
	if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
730
731
732
733
734
735
736
737
738
739
740
		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;
	}
741

742
	/* wmm support is a must to HT */
743
	if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED) &&
744
745
	    sband->ht_info.ht_supported &&
	    (ht_add_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_EXTRA_INFO))) {
746
		struct ieee80211_ht_addt_info *ht_add_info =
747
			(struct ieee80211_ht_addt_info *)ht_add_ie;
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
		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);
768
769
770
771
772
773
		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);
774
775
776
777
		/* 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);
778
	}
779
780
781

	kfree(ifsta->assocreq_ies);
	ifsta->assocreq_ies_len = (skb->data + skb->len) - ies;
782
	ifsta->assocreq_ies = kmalloc(ifsta->assocreq_ies_len, GFP_KERNEL);
783
784
785
	if (ifsta->assocreq_ies)
		memcpy(ifsta->assocreq_ies, ies, ifsta->assocreq_ies_len);

786
	ieee80211_sta_tx(sdata, skb, 0);
787
788
789
}


790
static void ieee80211_send_deauth(struct ieee80211_sub_if_data *sdata,
791
792
				  struct ieee80211_if_sta *ifsta, u16 reason)
{
793
	struct ieee80211_local *local = sdata->local;
794
795
796
797
798
799
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;

	skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
	if (!skb) {
		printk(KERN_DEBUG "%s: failed to allocate buffer for deauth "
800
		       "frame\n", sdata->dev->name);
801
802
803
804
805
806
807
		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);
808
	memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
809
	memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
810
811
	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
					  IEEE80211_STYPE_DEAUTH);
812
813
814
	skb_put(skb, 2);
	mgmt->u.deauth.reason_code = cpu_to_le16(reason);

815
	ieee80211_sta_tx(sdata, skb, 0);
816
817
818
}


819
static void ieee80211_send_disassoc(struct ieee80211_sub_if_data *sdata,
820
821
				    struct ieee80211_if_sta *ifsta, u16 reason)
{
822
	struct ieee80211_local *local = sdata->local;
823
824
825
826
827
828
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;

	skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
	if (!skb) {
		printk(KERN_DEBUG "%s: failed to allocate buffer for disassoc "
829
		       "frame\n", sdata->dev->name);
830
831
832
833
834
835
836
		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);
837
	memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
838
	memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
839
840
	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
					  IEEE80211_STYPE_DISASSOC);
841
842
843
	skb_put(skb, 2);
	mgmt->u.disassoc.reason_code = cpu_to_le16(reason);

844
	ieee80211_sta_tx(sdata, skb, 0);
845
846
847
}


848
static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata,
849
850
				      struct ieee80211_if_sta *ifsta)
{
851
	struct ieee80211_local *local = sdata->local;
852
	struct ieee80211_sta_bss *bss;
853
854
855
	int bss_privacy;
	int wep_privacy;
	int privacy_invoked;
856

857
	if (!ifsta || (ifsta->flags & IEEE80211_STA_MIXED_CELL))
858
859
		return 0;

860
	bss = ieee80211_rx_bss_get(local, ifsta->bssid,
861
				   local->hw.conf.channel->center_freq,
862
				   ifsta->ssid, ifsta->ssid_len);
863
864
865
	if (!bss)
		return 0;

866
	bss_privacy = !!(bss->capability & WLAN_CAPABILITY_PRIVACY);
867
	wep_privacy = !!ieee80211_sta_wep_configured(sdata);
868
	privacy_invoked = !!(ifsta->flags & IEEE80211_STA_PRIVACY_INVOKED);
869

870
	ieee80211_rx_bss_put(local, bss);
871

872
873
874
875
	if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
		return 0;

	return 1;
876
877
878
}


879
static void ieee80211_associate(struct ieee80211_sub_if_data *sdata,
880
881
				struct ieee80211_if_sta *ifsta)
{
882
883
	DECLARE_MAC_BUF(mac);

884
885
	ifsta->assoc_tries++;
	if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
886
		printk(KERN_DEBUG "%s: association with AP %s"
887
		       " timed out\n",
888
		       sdata->dev->name, print_mac(mac, ifsta->bssid));
889
		ifsta->state = IEEE80211_STA_MLME_DISABLED;
890
891
892
		return;
	}

893
	ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
894
	printk(KERN_DEBUG "%s: associate with AP %s\n",
895
896
	       sdata->dev->name, print_mac(mac, ifsta->bssid));
	if (ieee80211_privacy_mismatch(sdata, ifsta)) {
897
		printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
898
		       "mixed-cell disabled - abort association\n", sdata->dev->name);
899
		ifsta->state = IEEE80211_STA_MLME_DISABLED;
900
901
902
		return;
	}

903
	ieee80211_send_assoc(sdata, ifsta);
904
905
906
907
908

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


909
static void ieee80211_associated(struct ieee80211_sub_if_data *sdata,
910
911
				 struct ieee80211_if_sta *ifsta)
{
912
	struct ieee80211_local *local = sdata->local;
913
914
	struct sta_info *sta;
	int disassoc;
915
	DECLARE_MAC_BUF(mac);
916
917
918
919
920
921

	/* 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 */

922
	ifsta->state = IEEE80211_STA_MLME_ASSOCIATED;
923

924
925
	rcu_read_lock();

926
927
	sta = sta_info_get(local, ifsta->bssid);
	if (!sta) {
928
		printk(KERN_DEBUG "%s: No STA entry for own AP %s\n",
929
		       sdata->dev->name, print_mac(mac, ifsta->bssid));
930
931
932
933
934
		disassoc = 1;
	} else {
		disassoc = 0;
		if (time_after(jiffies,
			       sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
935
			if (ifsta->flags & IEEE80211_STA_PROBEREQ_POLL) {
936
				printk(KERN_DEBUG "%s: No ProbeResp from "
937
				       "current AP %s - assume out of "
938
				       "range\n",
939
				       sdata->dev->name, print_mac(mac, ifsta->bssid));
940
				disassoc = 1;
941
				sta_info_unlink(&sta);
942
			} else
943
				ieee80211_send_probe_req(sdata, ifsta->bssid,
944
945
							 local->scan_ssid,
							 local->scan_ssid_len);
946
			ifsta->flags ^= IEEE80211_STA_PROBEREQ_POLL;
947
		} else {
948
			ifsta->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
949
950
951
			if (time_after(jiffies, ifsta->last_probe +
				       IEEE80211_PROBE_INTERVAL)) {
				ifsta->last_probe = jiffies;
952
				ieee80211_send_probe_req(sdata, ifsta->bssid,
953
954
955
956
957
							 ifsta->ssid,
							 ifsta->ssid_len);
			}
		}
	}
958
959
960

	rcu_read_unlock();

961
	if (disassoc && sta)
962
963
		sta_info_destroy(sta);

964
	if (disassoc) {
965
		ifsta->state = IEEE80211_STA_MLME_DISABLED;
966
		ieee80211_set_associated(sdata, ifsta, 0);
967
968
969
970
971
972
973
	} else {
		mod_timer(&ifsta->timer, jiffies +
				      IEEE80211_MONITORING_INTERVAL);
	}
}


974
static void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
975
976
				     u8 *ssid, size_t ssid_len)
{
977
	struct ieee80211_local *local = sdata->local;
978
	struct ieee80211_supported_band *sband;
979
980
981
982
983
984
985
986
	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 "
987
		       "request\n", sdata->dev->name);
988
989
990
991
992
993
		return;
	}
	skb_reserve(skb, local->hw.extra_tx_headroom);

	mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
	memset(mgmt, 0, 24);
994
995
	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
					  IEEE80211_STYPE_PROBE_REQ);
996
	memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
	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;
1012
1013
1014
1015
	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];
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
		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]++;
		}
1028
		*pos = rate->bitrate / 5;
1029
1030
	}

1031
	ieee80211_sta_tx(sdata, skb, 0);
1032
1033
1034
}


1035
static int ieee80211_sta_wep_configured(struct ieee80211_sub_if_data *sdata)
1036
1037
{
	if (!sdata || !sdata->default_key ||
1038
	    sdata->default_key->conf.alg != ALG_WEP)
1039
1040
1041
1042
1043
		return 0;
	return 1;
}


1044
static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata,
1045
1046
				     struct ieee80211_if_sta *ifsta)
{
1047
	printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1048
	ifsta->flags |= IEEE80211_STA_AUTHENTICATED;
1049
	ieee80211_associate(sdata, ifsta);
1050
1051
1052
}


1053
static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1054
1055
1056
1057
1058
1059
1060
1061
				     struct ieee80211_if_sta *ifsta,
				     struct ieee80211_mgmt *mgmt,
				     size_t len)
{
	u8 *pos;
	struct ieee802_11_elems elems;

	pos = mgmt->u.auth.variable;
1062
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1063
	if (!elems.challenge)
1064
		return;
1065
	ieee80211_send_auth(sdata, ifsta, 3, elems.challenge - 2,
1066
1067
1068
			    elems.challenge_len + 2, 1);
}

1069
static void ieee80211_send_addba_resp(struct ieee80211_sub_if_data *sdata, u8 *da, u16 tid,
1070
1071
1072
1073
					u8 dialog_token, u16 status, u16 policy,
					u16 buf_size, u16 timeout)
{
	struct ieee80211_if_sta *ifsta = &sdata->u.sta;
1074
	struct ieee80211_local *local = sdata->local;
1075
1076
1077
1078
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;
	u16 capab;

1079
1080
	skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);

1081
1082
	if (!skb) {
		printk(KERN_DEBUG "%s: failed to allocate buffer "