mlme.c 122 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
38
39
40
41

#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)
42
#define IEEE80211_MESH_HOUSEKEEPING_INTERVAL (60 * HZ)
43
44
45
46
47
48
49
50
51
52
53
54
#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)
#define IEEE80211_IBSS_JOIN_TIMEOUT (20 * HZ)

#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)
55
#define IEEE80211_MESH_PEER_INACTIVITY_LIMIT (1800 * HZ)
56
57
58
59
60
61

#define IEEE80211_IBSS_MAX_STA_ENTRIES 128


#define ERP_INFO_USE_PROTECTION BIT(1)

62
63
64
65
66
67
/* mgmt header + 1 byte action code */
#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
68
69
#define IEEE80211_DELBA_PARAM_TID_MASK 0xF000
#define IEEE80211_DELBA_PARAM_INITIATOR_MASK 0x0800
70

71
72
73
74
75
/* 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

76
77
78
static void ieee80211_send_probe_req(struct net_device *dev, u8 *dst,
				     u8 *ssid, size_t ssid_len);
static struct ieee80211_sta_bss *
79
ieee80211_rx_bss_get(struct net_device *dev, u8 *bssid, int freq,
80
		     u8 *ssid, u8 ssid_len);
81
82
83
84
85
86
87
88
89
90
91
static void ieee80211_rx_bss_put(struct net_device *dev,
				 struct ieee80211_sta_bss *bss);
static int ieee80211_sta_find_ibss(struct net_device *dev,
				   struct ieee80211_if_sta *ifsta);
static int ieee80211_sta_wep_configured(struct net_device *dev);
static int ieee80211_sta_start_scan(struct net_device *dev,
				    u8 *ssid, size_t ssid_len);
static int ieee80211_sta_config_auth(struct net_device *dev,
				     struct ieee80211_if_sta *ifsta);


92
93
void ieee802_11_parse_elems(u8 *start, size_t len,
			    struct ieee802_11_elems *elems)
94
95
96
97
98
99
100
101
102
103
104
105
106
{
	size_t left = len;
	u8 *pos = start;

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

	while (left >= 2) {
		u8 id, elen;

		id = *pos++;
		elen = *pos++;
		left -= 2;

107
108
		if (elen > left)
			return;
109
110
111
112
113
114
115
116
117
118
119
120
121
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
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173

		switch (id) {
		case WLAN_EID_SSID:
			elems->ssid = pos;
			elems->ssid_len = elen;
			break;
		case WLAN_EID_SUPP_RATES:
			elems->supp_rates = pos;
			elems->supp_rates_len = elen;
			break;
		case WLAN_EID_FH_PARAMS:
			elems->fh_params = pos;
			elems->fh_params_len = elen;
			break;
		case WLAN_EID_DS_PARAMS:
			elems->ds_params = pos;
			elems->ds_params_len = elen;
			break;
		case WLAN_EID_CF_PARAMS:
			elems->cf_params = pos;
			elems->cf_params_len = elen;
			break;
		case WLAN_EID_TIM:
			elems->tim = pos;
			elems->tim_len = elen;
			break;
		case WLAN_EID_IBSS_PARAMS:
			elems->ibss_params = pos;
			elems->ibss_params_len = elen;
			break;
		case WLAN_EID_CHALLENGE:
			elems->challenge = pos;
			elems->challenge_len = elen;
			break;
		case WLAN_EID_WPA:
			if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
			    pos[2] == 0xf2) {
				/* Microsoft OUI (00:50:F2) */
				if (pos[3] == 1) {
					/* OUI Type 1 - WPA IE */
					elems->wpa = pos;
					elems->wpa_len = elen;
				} else if (elen >= 5 && pos[3] == 2) {
					if (pos[4] == 0) {
						elems->wmm_info = pos;
						elems->wmm_info_len = elen;
					} else if (pos[4] == 1) {
						elems->wmm_param = pos;
						elems->wmm_param_len = elen;
					}
				}
			}
			break;
		case WLAN_EID_RSN:
			elems->rsn = pos;
			elems->rsn_len = elen;
			break;
		case WLAN_EID_ERP_INFO:
			elems->erp_info = pos;
			elems->erp_info_len = elen;
			break;
		case WLAN_EID_EXT_SUPP_RATES:
			elems->ext_supp_rates = pos;
			elems->ext_supp_rates_len = elen;
			break;
174
175
176
177
178
179
180
181
		case WLAN_EID_HT_CAPABILITY:
			elems->ht_cap_elem = pos;
			elems->ht_cap_elem_len = elen;
			break;
		case WLAN_EID_HT_EXTRA_INFO:
			elems->ht_info_elem = pos;
			elems->ht_info_elem_len = elen;
			break;
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
		case WLAN_EID_MESH_ID:
			elems->mesh_id = pos;
			elems->mesh_id_len = elen;
			break;
		case WLAN_EID_MESH_CONFIG:
			elems->mesh_config = pos;
			elems->mesh_config_len = elen;
			break;
		case WLAN_EID_PEER_LINK:
			elems->peer_link = pos;
			elems->peer_link_len = elen;
			break;
		case WLAN_EID_PREQ:
			elems->preq = pos;
			elems->preq_len = elen;
			break;
		case WLAN_EID_PREP:
			elems->prep = pos;
			elems->prep_len = elen;
			break;
		case WLAN_EID_PERR:
			elems->perr = pos;
			elems->perr_len = elen;
			break;
206
207
208
209
210
211
212
213
214
215
216
217
		default:
			break;
		}

		left -= elen;
		pos += elen;
	}
}


static int ecw2cw(int ecw)
{
218
	return (1 << ecw) - 1;
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

static void ieee80211_sta_def_wmm_params(struct net_device *dev,
					 struct ieee80211_sta_bss *bss,
					 int ibss)
{
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	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;

		for (i = IEEE80211_TX_QUEUE_DATA0; i < NUM_TX_DATA_QUEUES; i++)
			local->ops->conf_tx(local_to_hw(local),
					   i + IEEE80211_TX_QUEUE_DATA0,
					   &qparam);

		if (ibss) {
			/* IBSS uses different parameters for Beacon sending */
			qparam.cw_min++;
			qparam.cw_min *= 2;
			qparam.cw_min--;
			local->ops->conf_tx(local_to_hw(local),
					   IEEE80211_TX_QUEUE_BEACON, &qparam);
		}
	}
}

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
static void ieee80211_sta_wmm_params(struct net_device *dev,
				     struct ieee80211_if_sta *ifsta,
				     u8 *wmm_param, size_t wmm_param_len)
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
	struct ieee80211_tx_queue_params params;
	size_t left;
	int count;
	u8 *pos;

	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:
			queue = IEEE80211_TX_QUEUE_DATA3;
Johannes Berg's avatar
Johannes Berg committed
309
			if (acm)
310
311
312
313
				local->wmm_acm |= BIT(0) | BIT(3);
			break;
		case 2:
			queue = IEEE80211_TX_QUEUE_DATA1;
Johannes Berg's avatar
Johannes Berg committed
314
			if (acm)
315
316
317
318
				local->wmm_acm |= BIT(4) | BIT(5);
			break;
		case 3:
			queue = IEEE80211_TX_QUEUE_DATA0;
Johannes Berg's avatar
Johannes Berg committed
319
			if (acm)
320
321
322
323
324
				local->wmm_acm |= BIT(6) | BIT(7);
			break;
		case 0:
		default:
			queue = IEEE80211_TX_QUEUE_DATA2;
Johannes Berg's avatar
Johannes Berg committed
325
			if (acm)
326
327
328
329
330
331
332
				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);
333
334
		params.txop = pos[2] | (pos[3] << 8);
#ifdef CONFIG_MAC80211_DEBUG
335
		printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
336
		       "cWmin=%d cWmax=%d txop=%d\n",
337
		       dev->name, queue, aci, acm, params.aifs, params.cw_min,
338
339
		       params.cw_max, params.txop);
#endif
340
341
342
343
344
345
346
347
348
		/* 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 "
			       "parameters for queue %d\n", dev->name, queue);
		}
	}
}

349
350
351
static u32 ieee80211_handle_protect_preamb(struct ieee80211_sub_if_data *sdata,
					   bool use_protection,
					   bool use_short_preamble)
352
{
353
	struct ieee80211_bss_conf *bss_conf = &sdata->bss_conf;
354
	struct ieee80211_if_sta *ifsta = &sdata->u.sta;
355
	DECLARE_MAC_BUF(mac);
356
	u32 changed = 0;
357

358
	if (use_protection != bss_conf->use_cts_prot) {
359
360
		if (net_ratelimit()) {
			printk(KERN_DEBUG "%s: CTS protection %s (BSSID="
361
			       "%s)\n",
362
			       sdata->dev->name,
363
			       use_protection ? "enabled" : "disabled",
364
			       print_mac(mac, ifsta->bssid));
365
		}
366
367
		bss_conf->use_cts_prot = use_protection;
		changed |= BSS_CHANGED_ERP_CTS_PROT;
368
	}
369

370
	if (use_short_preamble != bss_conf->use_short_preamble) {
371
372
		if (net_ratelimit()) {
			printk(KERN_DEBUG "%s: switched to %s barker preamble"
373
			       " (BSSID=%s)\n",
374
			       sdata->dev->name,
375
			       use_short_preamble ? "short" : "long",
376
			       print_mac(mac, ifsta->bssid));
377
		}
378
		bss_conf->use_short_preamble = use_short_preamble;
379
		changed |= BSS_CHANGED_ERP_PREAMBLE;
380
	}
381

382
	return changed;
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
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;
}

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
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;
}
456

457
458
459
460
461
462
463
464
465
466
467
468
static void ieee80211_sta_send_associnfo(struct net_device *dev,
					 struct ieee80211_if_sta *ifsta)
{
	char *buf;
	size_t len;
	int i;
	union iwreq_data wrqu;

	if (!ifsta->assocreq_ies && !ifsta->assocresp_ies)
		return;

	buf = kmalloc(50 + 2 * (ifsta->assocreq_ies_len +
469
				ifsta->assocresp_ies_len), GFP_KERNEL);
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
502
503
504
505
506
507
508
	if (!buf)
		return;

	len = sprintf(buf, "ASSOCINFO(");
	if (ifsta->assocreq_ies) {
		len += sprintf(buf + len, "ReqIEs=");
		for (i = 0; i < ifsta->assocreq_ies_len; i++) {
			len += sprintf(buf + len, "%02x",
				       ifsta->assocreq_ies[i]);
		}
	}
	if (ifsta->assocresp_ies) {
		if (ifsta->assocreq_ies)
			len += sprintf(buf + len, " ");
		len += sprintf(buf + len, "RespIEs=");
		for (i = 0; i < ifsta->assocresp_ies_len; i++) {
			len += sprintf(buf + len, "%02x",
				       ifsta->assocresp_ies[i]);
		}
	}
	len += sprintf(buf + len, ")");

	if (len > IW_CUSTOM_MAX) {
		len = sprintf(buf, "ASSOCRESPIE=");
		for (i = 0; i < ifsta->assocresp_ies_len; i++) {
			len += sprintf(buf + len, "%02x",
				       ifsta->assocresp_ies[i]);
		}
	}

	memset(&wrqu, 0, sizeof(wrqu));
	wrqu.data.length = len;
	wireless_send_event(dev, IWEVCUSTOM, &wrqu, buf);

	kfree(buf);
}


static void ieee80211_set_associated(struct net_device *dev,
509
				     struct ieee80211_if_sta *ifsta,
510
				     bool assoc)
511
{
512
513
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	struct ieee80211_local *local = sdata->local;
Tomas Winkler's avatar
Tomas Winkler committed
514
	struct ieee80211_conf *conf = &local_to_hw(local)->conf;
515
	union iwreq_data wrqu;
516
	u32 changed = BSS_CHANGED_ASSOC;
517
518

	if (assoc) {
519
		struct ieee80211_sta_bss *bss;
520
521
522

		ifsta->flags |= IEEE80211_STA_ASSOCIATED;

523
		if (sdata->vif.type != IEEE80211_IF_TYPE_STA)
524
			return;
525

526
		bss = ieee80211_rx_bss_get(dev, ifsta->bssid,
Tomas Winkler's avatar
Tomas Winkler committed
527
					   conf->channel->center_freq,
528
					   ifsta->ssid, ifsta->ssid_len);
529
		if (bss) {
530
531
532
533
			/* set timing information */
			sdata->bss_conf.beacon_int = bss->beacon_int;
			sdata->bss_conf.timestamp = bss->timestamp;

534
			changed |= ieee80211_handle_bss_capability(sdata, bss);
535

536
537
538
			ieee80211_rx_bss_put(dev, bss);
		}

Tomas Winkler's avatar
Tomas Winkler committed
539
540
541
542
543
544
545
		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;
		}

546
		netif_carrier_on(dev);
547
		ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
548
549
550
551
		memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN);
		memcpy(wrqu.ap_addr.sa_data, sdata->u.sta.bssid, ETH_ALEN);
		ieee80211_sta_send_associnfo(dev, ifsta);
	} else {
552
		ieee80211_sta_tear_down_BA_sessions(dev, ifsta->bssid);
553
		ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
554
		netif_carrier_off(dev);
555
		ieee80211_reset_erp_info(dev);
Tomas Winkler's avatar
Tomas Winkler committed
556
557
558
559
560

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

561
562
563
		memset(wrqu.ap_addr.sa_data, 0, ETH_ALEN);
	}
	ifsta->last_probe = jiffies;
564
	ieee80211_led_assoc(local, assoc);
565

566
	sdata->bss_conf.assoc = assoc;
567
	ieee80211_bss_info_change_notify(sdata, changed);
568
569
	wrqu.ap_addr.sa_family = ARPHRD_ETHER;
	wireless_send_event(dev, SIOCGIWAP, &wrqu, NULL);
570
571
572
573
574
575
576
577
578
579
580
}

static void ieee80211_set_disassoc(struct net_device *dev,
				   struct ieee80211_if_sta *ifsta, int deauth)
{
	if (deauth)
		ifsta->auth_tries = 0;
	ifsta->assoc_tries = 0;
	ieee80211_set_associated(dev, ifsta, 0);
}

581
582
void ieee80211_sta_tx(struct net_device *dev, struct sk_buff *skb,
		      int encrypt)
583
584
585
586
587
588
589
590
591
592
593
594
595
{
	struct ieee80211_sub_if_data *sdata;
	struct ieee80211_tx_packet_data *pkt_data;

	sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	skb->dev = sdata->local->mdev;
	skb_set_mac_header(skb, 0);
	skb_set_network_header(skb, 0);
	skb_set_transport_header(skb, 0);

	pkt_data = (struct ieee80211_tx_packet_data *) skb->cb;
	memset(pkt_data, 0, sizeof(struct ieee80211_tx_packet_data));
	pkt_data->ifindex = sdata->dev->ifindex;
596
597
	if (!encrypt)
		pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643

	dev_queue_xmit(skb);
}


static void ieee80211_send_auth(struct net_device *dev,
				struct ieee80211_if_sta *ifsta,
				int transaction, u8 *extra, size_t extra_len,
				int encrypt)
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
	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", 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 = IEEE80211_FC(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, 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);

	ieee80211_sta_tx(dev, skb, encrypt);
}


static void ieee80211_authenticate(struct net_device *dev,
				   struct ieee80211_if_sta *ifsta)
{
644
645
	DECLARE_MAC_BUF(mac);

646
647
	ifsta->auth_tries++;
	if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
648
		printk(KERN_DEBUG "%s: authentication with AP %s"
649
		       " timed out\n",
650
		       dev->name, print_mac(mac, ifsta->bssid));
651
652
653
654
655
		ifsta->state = IEEE80211_DISABLED;
		return;
	}

	ifsta->state = IEEE80211_AUTHENTICATE;
656
657
	printk(KERN_DEBUG "%s: authenticate with AP %s\n",
	       dev->name, print_mac(mac, ifsta->bssid));
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675

	ieee80211_send_auth(dev, ifsta, 1, NULL, 0, 0);

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


static void ieee80211_send_assoc(struct net_device *dev,
				 struct ieee80211_if_sta *ifsta)
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;
	u8 *pos, *ies;
	int i, len;
	u16 capab;
	struct ieee80211_sta_bss *bss;
	int wmm = 0;
676
	struct ieee80211_supported_band *sband;
677
678
679
680
681
682
683
684
685
686
687

	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", dev->name);
		return;
	}
	skb_reserve(skb, local->hw.extra_tx_headroom);

688
689
	sband = local->hw.wiphy->bands[local->hw.conf.channel->band];

690
	capab = ifsta->capab;
691
692
693
694
695
696

	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;
697
	}
698
699
700

	bss = ieee80211_rx_bss_get(dev, ifsta->bssid,
				   local->hw.conf.channel->center_freq,
701
				   ifsta->ssid, ifsta->ssid_len);
702
703
704
	if (bss) {
		if (bss->capability & WLAN_CAPABILITY_PRIVACY)
			capab |= WLAN_CAPABILITY_PRIVACY;
Johannes Berg's avatar
Johannes Berg committed
705
		if (bss->wmm_ie)
706
707
708
709
710
711
712
713
714
715
			wmm = 1;
		ieee80211_rx_bss_put(dev, bss);
	}

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

716
	if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) {
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
		skb_put(skb, 10);
		mgmt->frame_control = IEEE80211_FC(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(1);
		memcpy(mgmt->u.reassoc_req.current_ap, ifsta->prev_bssid,
		       ETH_ALEN);
	} else {
		skb_put(skb, 4);
		mgmt->frame_control = IEEE80211_FC(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(1);
	}

	/* 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);

738
	len = sband->n_bitrates;
739
740
741
742
743
744
	if (len > 8)
		len = 8;
	pos = skb_put(skb, len + 2);
	*pos++ = WLAN_EID_SUPP_RATES;
	*pos++ = len;
	for (i = 0; i < len; i++) {
745
		int rate = sband->bitrates[i].bitrate;
746
747
748
		*pos++ = (u8) (rate / 5);
	}

749
750
	if (sband->n_bitrates > len) {
		pos = skb_put(skb, sband->n_bitrates - len + 2);
751
		*pos++ = WLAN_EID_EXT_SUPP_RATES;
752
753
754
		*pos++ = sband->n_bitrates - len;
		for (i = len; i < sband->n_bitrates; i++) {
			int rate = sband->bitrates[i].bitrate;
755
756
757
758
759
760
761
762
763
			*pos++ = (u8) (rate / 5);
		}
	}

	if (ifsta->extra_ie) {
		pos = skb_put(skb, ifsta->extra_ie_len);
		memcpy(pos, ifsta->extra_ie, ifsta->extra_ie_len);
	}

764
	if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
765
766
767
768
769
770
771
772
773
774
775
		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;
	}
776
	/* wmm support is a must to HT */
777
778
	if (wmm && sband->ht_info.ht_supported) {
		__le16 tmp = cpu_to_le16(sband->ht_info.cap);
779
780
781
782
783
784
		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);
785
786
787
788
		/* 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);
789
	}
790
791
792

	kfree(ifsta->assocreq_ies);
	ifsta->assocreq_ies_len = (skb->data + skb->len) - ies;
793
	ifsta->assocreq_ies = kmalloc(ifsta->assocreq_ies_len, GFP_KERNEL);
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
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
851
852
853
854
855
856
857
858
859
860
861
	if (ifsta->assocreq_ies)
		memcpy(ifsta->assocreq_ies, ies, ifsta->assocreq_ies_len);

	ieee80211_sta_tx(dev, skb, 0);
}


static void ieee80211_send_deauth(struct net_device *dev,
				  struct ieee80211_if_sta *ifsta, u16 reason)
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
	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 "
		       "frame\n", dev->name);
		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, dev->dev_addr, ETH_ALEN);
	memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
	mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
					   IEEE80211_STYPE_DEAUTH);
	skb_put(skb, 2);
	mgmt->u.deauth.reason_code = cpu_to_le16(reason);

	ieee80211_sta_tx(dev, skb, 0);
}


static void ieee80211_send_disassoc(struct net_device *dev,
				    struct ieee80211_if_sta *ifsta, u16 reason)
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
	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 "
		       "frame\n", dev->name);
		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, dev->dev_addr, ETH_ALEN);
	memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
	mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
					   IEEE80211_STYPE_DISASSOC);
	skb_put(skb, 2);
	mgmt->u.disassoc.reason_code = cpu_to_le16(reason);

	ieee80211_sta_tx(dev, skb, 0);
}


static int ieee80211_privacy_mismatch(struct net_device *dev,
				      struct ieee80211_if_sta *ifsta)
{
862
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
863
	struct ieee80211_sta_bss *bss;
864
865
866
	int bss_privacy;
	int wep_privacy;
	int privacy_invoked;
867

868
	if (!ifsta || (ifsta->flags & IEEE80211_STA_MIXED_CELL))
869
870
		return 0;

871
872
	bss = ieee80211_rx_bss_get(dev, ifsta->bssid,
				   local->hw.conf.channel->center_freq,
873
				   ifsta->ssid, ifsta->ssid_len);
874
875
876
	if (!bss)
		return 0;

877
878
879
	bss_privacy = !!(bss->capability & WLAN_CAPABILITY_PRIVACY);
	wep_privacy = !!ieee80211_sta_wep_configured(dev);
	privacy_invoked = !!(ifsta->flags & IEEE80211_STA_PRIVACY_INVOKED);
880
881
882

	ieee80211_rx_bss_put(dev, bss);

883
884
885
886
	if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
		return 0;

	return 1;
887
888
889
890
891
892
}


static void ieee80211_associate(struct net_device *dev,
				struct ieee80211_if_sta *ifsta)
{
893
894
	DECLARE_MAC_BUF(mac);

895
896
	ifsta->assoc_tries++;
	if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
897
		printk(KERN_DEBUG "%s: association with AP %s"
898
		       " timed out\n",
899
		       dev->name, print_mac(mac, ifsta->bssid));
900
901
902
903
904
		ifsta->state = IEEE80211_DISABLED;
		return;
	}

	ifsta->state = IEEE80211_ASSOCIATE;
905
906
	printk(KERN_DEBUG "%s: associate with AP %s\n",
	       dev->name, print_mac(mac, ifsta->bssid));
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
	if (ieee80211_privacy_mismatch(dev, ifsta)) {
		printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
		       "mixed-cell disabled - abort association\n", dev->name);
		ifsta->state = IEEE80211_DISABLED;
		return;
	}

	ieee80211_send_assoc(dev, ifsta);

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


static void ieee80211_associated(struct net_device *dev,
				 struct ieee80211_if_sta *ifsta)
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
	struct sta_info *sta;
	int disassoc;
926
	DECLARE_MAC_BUF(mac);
927
928
929
930
931
932
933
934

	/* 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 */

	ifsta->state = IEEE80211_ASSOCIATED;

935
936
	rcu_read_lock();

937
938
	sta = sta_info_get(local, ifsta->bssid);
	if (!sta) {
939
940
		printk(KERN_DEBUG "%s: No STA entry for own AP %s\n",
		       dev->name, print_mac(mac, ifsta->bssid));
941
942
943
944
945
		disassoc = 1;
	} else {
		disassoc = 0;
		if (time_after(jiffies,
			       sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
946
			if (ifsta->flags & IEEE80211_STA_PROBEREQ_POLL) {
947
				printk(KERN_DEBUG "%s: No ProbeResp from "
948
				       "current AP %s - assume out of "
949
				       "range\n",
950
				       dev->name, print_mac(mac, ifsta->bssid));
951
				disassoc = 1;
952
				sta_info_unlink(&sta);
953
			} else
954
955
956
				ieee80211_send_probe_req(dev, ifsta->bssid,
							 local->scan_ssid,
							 local->scan_ssid_len);
957
			ifsta->flags ^= IEEE80211_STA_PROBEREQ_POLL;
958
		} else {
959
			ifsta->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
960
961
962
963
964
965
966
967
968
			if (time_after(jiffies, ifsta->last_probe +
				       IEEE80211_PROBE_INTERVAL)) {
				ifsta->last_probe = jiffies;
				ieee80211_send_probe_req(dev, ifsta->bssid,
							 ifsta->ssid,
							 ifsta->ssid_len);
			}
		}
	}
969
970
971

	rcu_read_unlock();

972
	if (disassoc && sta)
973
974
		sta_info_destroy(sta);

975
	if (disassoc) {
976
977
		ifsta->state = IEEE80211_DISABLED;
		ieee80211_set_associated(dev, ifsta, 0);
978
979
980
981
982
983
984
985
986
987
988
	} else {
		mod_timer(&ifsta->timer, jiffies +
				      IEEE80211_MONITORING_INTERVAL);
	}
}


static void ieee80211_send_probe_req(struct net_device *dev, u8 *dst,
				     u8 *ssid, size_t ssid_len)
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
989
	struct ieee80211_supported_band *sband;
990
991
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
1020
1021
1022
	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", 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 = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
					   IEEE80211_STYPE_PROBE_REQ);
	memcpy(mgmt->sa, 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;
1023
1024
1025
1026
	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];
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
		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]++;
		}
1039
		*pos = rate->bitrate / 5;
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
	}

	ieee80211_sta_tx(dev, skb, 0);
}


static int ieee80211_sta_wep_configured(struct net_device *dev)
{
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	if (!sdata || !sdata->default_key ||
1050
	    sdata->default_key->conf.alg != ALG_WEP)
1051
1052
1053
1054
1055
1056
1057
1058
1059
		return 0;
	return 1;
}


static void ieee80211_auth_completed(struct net_device *dev,
				     struct ieee80211_if_sta *ifsta)
{
	printk(KERN_DEBUG "%s: authenticated\n", dev->name);
1060
	ifsta->flags |= IEEE80211_STA_AUTHENTICATED;
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
	ieee80211_associate(dev, ifsta);
}


static void ieee80211_auth_challenge(struct net_device *dev,
				     struct ieee80211_if_sta *ifsta,
				     struct ieee80211_mgmt *mgmt,
				     size_t len)
{
	u8 *pos;
	struct ieee802_11_elems elems;

	printk(KERN_DEBUG "%s: replying to auth challenge\n", dev->name);
	pos = mgmt->u.auth.variable;
1075
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1076
1077
1078
1079
1080
1081
1082
1083
1084
	if (!elems.challenge) {
		printk(KERN_DEBUG "%s: no challenge IE in shared key auth "
		       "frame\n", dev->name);
		return;
	}
	ieee80211_send_auth(dev, ifsta, 3, elems.challenge - 2,
			    elems.challenge_len + 2, 1);
}

1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
static void ieee80211_send_addba_resp(struct net_device *dev, u8 *da, u16 tid,
					u8 dialog_token, u16 status, u16 policy,
					u16 buf_size, u16 timeout)
{
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	struct ieee80211_if_sta *ifsta = &sdata->u.sta;
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;
	u16 capab;

1096
1097
	skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);

1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
	if (!skb) {
		printk(KERN_DEBUG "%s: failed to allocate buffer "
		       "for addba resp frame\n", dev->name);
		return;
	}

	skb_reserve(skb, local->hw.extra_tx_headroom);
	mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
	memset(mgmt, 0, 24);
	memcpy(mgmt->da, da, ETH_ALEN);
	memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
1109
	if (sdata->vif.type == IEEE80211_IF_TYPE_AP)
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
		memcpy(mgmt->bssid, dev->dev_addr, ETH_ALEN);
	else
		memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
	mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
					   IEEE80211_STYPE_ACTION);

	skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_resp));
	mgmt->u.action.category = WLAN_CATEGORY_BACK;
	mgmt->u.action.u.addba_resp.action_code = WLAN_ACTION_ADDBA_RESP;
	mgmt->u.action.u.addba_resp.dialog_token = dialog_token;

	capab = (u16)(policy << 1);	/* bit 1 aggregation policy */
	capab |= (u16)(tid << 2); 	/* bit 5:2 TID number */
	capab |= (u16)(buf_size << 6);	/* bit 15:6 max size of aggregation */

	mgmt->u.action.u.addba_resp.capab = cpu_to_le16(capab);
	mgmt->u.action.u.addba_resp.timeout = cpu_to_le16(timeout);
	mgmt->u.action.u.addba_resp.status = cpu_to_le16(status);

	ieee80211_sta_tx(dev, skb, 0);

	return;
}

1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
void ieee80211_send_addba_request(struct net_device *dev, const u8 *da,
				u16 tid, u8 dialog_token, u16 start_seq_num,
				u16 agg_size, u16 timeout)
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	struct ieee80211_if_sta *ifsta = &sdata->u.sta;
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;
	u16 capab;

1145
	skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183

	if (!skb) {
		printk(KERN_ERR "%s: failed to allocate buffer "
				"for addba request frame\n", dev->name);
		return;
	}
	skb_reserve(skb, local->hw.extra_tx_headroom);
	mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
	memset(mgmt, 0, 24);
	memcpy(mgmt->da, da, ETH_ALEN);
	memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
	if (sdata->vif.type == IEEE80211_IF_TYPE_AP)
		memcpy(mgmt->bssid, dev->dev_addr, ETH_ALEN);
	else
		memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);

	mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
					IEEE80211_STYPE_ACTION);

	skb_put(skb, 1 + sizeof(mgmt->u.action.u.addba_req));

	mgmt->u.action.category = WLAN_CATEGORY_BACK;
	mgmt->u.action.u.addba_req.action_code = WLAN_ACTION_ADDBA_REQ;

	mgmt->u.action.u.addba_req.dialog_token = dialog_token;
	capab = (u16)(1 << 1);		/* bit 1 aggregation policy */
	capab |= (u16)(tid << 2); 	/* bit 5:2 TID number */
	capab |= (u16)(agg_size << 6);	/* bit 15:6 max size of aggergation */

	mgmt->u.action.u.addba_req.capab = cpu_to_le16(capab);

	mgmt->u.action.u.addba_req.timeout = cpu_to_le16(timeout);
	mgmt->u.action.u.addba_req.start_seq_num =
					cpu_to_le16(start_seq_num << 4);

	ieee80211_sta_tx(dev, skb, 0);
}

1184
1185
1186
1187
1188
static void ieee80211_sta_process_addba_request(struct net_device *dev,
						struct ieee80211_mgmt *mgmt,
						size_t len)
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1189
1190
	struct ieee80211_hw *hw = &local->hw;
	struct ieee80211_conf *conf = &hw->conf;
1191
	struct sta_info *sta;
1192
1193
	struct tid_ampdu_rx *tid_agg_rx;
	u16 capab, tid, timeout, ba_policy, buf_size, start_seq_num, status;
1194
	u8 dialog_token;
1195
1196
	int ret = -EOPNOTSUPP;
	DECLARE_MAC_BUF(mac);
1197

1198
1199
	rcu_read_lock();

1200
	sta = sta_info_get(local, mgmt->sa);
1201
1202
	if (!sta) {
		rcu_read_unlock();
1203
		return;
1204
	}
1205
1206
1207
1208

	/* extract session parameters from addba request frame */
	dialog_token = mgmt->u.action.u.addba_req.dialog_token;
	timeout = le16_to_cpu(mgmt->u.action.u.addba_req.timeout);
1209
1210
	start_seq_num =
		le16_to_cpu(mgmt->u.action.u.addba_req.start_seq_num) >> 4;
1211
1212
1213
1214
1215
1216
1217
1218

	capab = le16_to_cpu(mgmt->u.action.u.addba_req.capab);
	ba_policy = (capab & IEEE80211_ADDBA_PARAM_POLICY_MASK) >> 1;
	tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;
	buf_size = (capab & IEEE80211_ADDBA_PARAM_BUF_SIZE_MASK) >> 6;

	status = WLAN_STATUS_REQUEST_DECLINED;

1219
1220
1221
1222
1223
1224
1225
1226
1227
	/* sanity check for incoming parameters:
	 * check if configuration can support the BA policy
	 * and if buffer size does not exceeds max value */
	if (((ba_policy != 1)
		&& (!(conf->ht_conf.cap & IEEE80211_HT_CAP_DELAY_BA)))
		|| (buf_size > IEEE80211_MAX_AMPDU_BUF)) {
		status = WLAN_STATUS_INVALID_QOS_PARAM;
#ifdef CONFIG_MAC80211_HT_DEBUG
		if (net_ratelimit())
1228
			printk(KERN_DEBUG "AddBA Req with bad params from "
1229
1230
1231
1232
1233
1234
1235
1236
				"%s on tid %u. policy %d, buffer size %d\n",
				print_mac(mac, mgmt->sa), tid, ba_policy,
				buf_size);
#endif /* CONFIG_MAC80211_HT_DEBUG */
		goto end_no_lock;
	}
	/* determine default buffer size */
	if (buf_size == 0) {
1237
1238
1239
		struct ieee80211_supported_band *sband;

		sband = local->hw.wiphy->bands[conf->channel->band];
1240
		buf_size = IEEE80211_MIN_AMPDU_BUF;
1241
		buf_size = buf_size << sband->ht_info.ampdu_factor;
1242
1243
1244
1245
1246
1247
	}


	/* examine state machine */
	spin_lock_bh(&sta->ampdu_mlme.ampdu_rx);

1248
	if (sta->ampdu_mlme.tid_state_rx[tid] != HT_AGG_STATE_IDLE) {
1249
1250
#ifdef CONFIG_MAC80211_HT_DEBUG
		if (net_ratelimit())
1251
			printk(KERN_DEBUG "unexpected AddBA Req from "
1252
1253
1254
1255
1256
1257
				"%s on tid %u\n",
				print_mac(mac, mgmt->sa), tid);
#endif /* CONFIG_MAC80211_HT_DEBUG */
		goto end;
	}

1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
	/* prepare A-MPDU MLME for Rx aggregation */
	sta->ampdu_mlme.tid_rx[tid] =
			kmalloc(sizeof(struct tid_ampdu_rx), GFP_ATOMIC);
	if (!sta->ampdu_mlme.tid_rx[tid]) {
		if (net_ratelimit())
			printk(KERN_ERR "allocate rx mlme to tid %d failed\n",
					tid);
		goto end;
	}
	/* rx timer */
	sta->ampdu_mlme.tid_rx[tid]->session_timer.function =
				sta_rx_agg_session_timer_expired;
	sta->ampdu_mlme.tid_rx[tid]->session_timer.data =
				(unsigned long)&sta->timer_to_tid[tid];
	init_timer(&sta->ampdu_mlme.tid_rx[tid]->session_timer);

	tid_agg_rx = sta->ampdu_mlme.tid_rx[tid];

1276
1277
1278
	/* prepare reordering buffer */
	tid_agg_rx->reorder_buf =
		kmalloc(buf_size * sizeof(struct sk_buf *), GFP_ATOMIC);
1279
1280
1281
1282
	if (!tid_agg_rx->reorder_buf) {
		if (net_ratelimit())
			printk(KERN_ERR "can not allocate reordering buffer "
			       "to tid %d\n", tid);
1283
		kfree(sta->ampdu_mlme.tid_rx[tid]);
1284
1285
1286
1287
1288
1289
1290
		goto end;
	}
	memset(tid_agg_rx->reorder_buf, 0,
		buf_size * sizeof(struct sk_buf *));

	if (local->ops->ampdu_action)
		ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_RX_START,
1291
					       sta->addr, tid, &start_seq_num);
1292
#ifdef CONFIG_MAC80211_HT_DEBUG
1293
	printk(KERN_DEBUG "Rx A-MPDU request on tid %d result %d\n", tid, ret);
1294
1295
1296
1297
#endif /* CONFIG_MAC80211_HT_DEBUG */

	if (ret) {
		kfree(tid_agg_rx->reorder_buf);
1298
1299
		kfree(tid_agg_rx);
		sta->ampdu_mlme.tid_rx[tid] = NULL;
1300
1301
1302
1303
		goto end;
	}

	/* change state and send addba resp */
1304
	sta->ampdu_mlme.tid_state_rx[tid] = HT_AGG_STATE_OPERATIONAL;
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
	tid_agg_rx->dialog_token = dialog_token;
	tid_agg_rx->ssn = start_seq_num;
	tid_agg_rx->head_seq_num = start_seq_num;
	tid_agg_rx->buf_size = buf_size;
	tid_agg_rx->timeout = timeout;
	tid_agg_rx->stored_mpdu_num = 0;
	status = WLAN_STATUS_SUCCESS;
end:
	spin_unlock_bh(&sta->ampdu_mlme.ampdu_rx);

end_no_lock:
1316
1317
1318
	ieee80211_send_addba_resp(sta->sdata->dev, sta->addr, tid,
				  dialog_token, status, 1, buf_size, timeout);
	rcu_read_unlock();
1319
}
1320

1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
static void ieee80211_sta_process_addba_resp(struct net_device *dev,
					     struct ieee80211_mgmt *mgmt,
					     size_t len)
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
	struct ieee80211_hw *hw = &local->hw;
	struct sta_info *sta;
	u16 capab;
	u16 tid;
	u8 *state;

1332
1333
	rcu_read_lock();

1334
	sta = sta_info_get(local, mgmt->sa);
1335
1336
	if (!sta) {
		rcu_read_unlock();
1337
		return;
1338
	}
1339
1340
1341
1342

	capab = le16_to_cpu(mgmt->u.action.u.addba_resp.capab);
	tid = (capab & IEEE80211_ADDBA_PARAM_TID_MASK) >> 2;

1343
	state = &sta->ampdu_mlme.tid_state_tx[tid];
1344
1345
1346

	spin_lock_bh(&sta->ampdu_mlme.ampdu_tx);

1347
1348
1349
1350
1351
1352
1353
	if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
		spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
		printk(KERN_DEBUG "state not HT_ADDBA_REQUESTED_MSK:"
			"%d\n", *state);
		goto addba_resp_exit;
	}

1354
	if (mgmt->u.action.u.addba_resp.dialog_token !=
1355
		sta->ampdu_mlme.tid_tx[tid]->dialog_token) {
1356
1357
1358
1359
		spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
#ifdef CONFIG_MAC80211_HT_DEBUG
		printk(KERN_DEBUG "wrong addBA response token, tid %d\n", tid);
#endif /* CONFIG_MAC80211_HT_DEBUG */
1360
		goto addba_resp_exit;
1361
1362
	}

1363
	del_timer_sync(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
1364
1365
1366
1367
1368
1369
1370
1371
1372
#ifdef CONFIG_MAC80211_HT_DEBUG
	printk(KERN_DEBUG "switched off addBA timer for tid %d \n", tid);
#endif /* CONFIG_MAC80211_HT_DEBUG */
	if (le16_to_cpu(mgmt->u.action.u.addba_resp.status)
			== WLAN_STATUS_SUCCESS) {
		if (*state & HT_ADDBA_RECEIVED_MSK)
			printk(KERN_DEBUG "double addBA response\n");

		*state |= HT_ADDBA_RECEIVED_MSK;
1373
		sta->ampdu_mlme.addba_req_num[tid] = 0;
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384

		if (*state == HT_AGG_STATE_OPERATIONAL) {
			printk(KERN_DEBUG "Aggregation on for tid %d \n", tid);
			ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
		}

		spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
		printk(KERN_DEBUG "recipient accepted agg: tid %d \n", tid);
	} else {
		printk(KERN_DEBUG "recipient rejected agg: tid %d \n", tid);

1385
		sta->ampdu_mlme.addba_req_num[tid]++;
1386
1387
1388
1389
1390
1391
		/* this will allow the state check in stop_BA_session */
		*state = HT_AGG_STATE_OPERATIONAL;
		spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
		ieee80211_stop_tx_ba_session(hw, sta->addr, tid,
					     WLAN_BACK_INITIATOR);
	}
1392
1393

addba_resp_exit:
1394
	rcu_read_unlock();
1395
1396
1397
1398
}

void ieee80211_send_delba(struct net_device *dev, const u8 *da, u16 tid,
			  u16 initiator, u16 reason_code)
1399
1400
1401
1402
1403
1404
1405
1406
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
	struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
	struct ieee80211_if_sta *ifsta = &sdata->u.sta;
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;
	u16 params;

1407
	skb = dev_alloc_skb(sizeof(*mgmt) + local->hw.extra_tx_headroom);
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419

	if (!skb) {
		printk(KERN_ERR "%s: failed to allocate buffer "
					"for delba frame\n", dev->name);
		return;
	}

	skb_reserve(skb, local->hw.extra_tx_headroom);
	mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
	memset(mgmt, 0, 24);
	memcpy(mgmt->da, da, ETH_ALEN);
	memcpy(mgmt->sa, dev->dev_addr, ETH_ALEN);
1420
	if (sdata->vif.type == IEEE80211_IF_TYPE_AP)
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
		memcpy(mgmt->bssid, dev->dev_addr, ETH_ALEN);
	else
		memcpy(mgmt->bssid, ifsta->bssid, ETH_ALEN);
	mgmt->frame_control = IEEE80211_FC(IEEE80211_FTYPE_MGMT,
					IEEE80211_STYPE_ACTION);

	skb_put(skb, 1 + sizeof(mgmt->u.action.u.delba));

	mgmt->u.action.category = WLAN_CATEGORY_BACK;
	mgmt->u.action.u.delba.action_code = WLAN_ACTION_DELBA;
	params = (u16)(initiator << 11); 	/* bit 11 initiator */
	params |= (u16)(tid << 12); 		/* bit 15:12 TID number */

	mgmt->u.action.u.delba.params = cpu_to_le16(params);
	mgmt->u.action.u.delba.reason_code = cpu_to_le16(reason_code);

	ieee80211_sta_tx(dev, skb, 0);
}

void ieee80211_sta_stop_rx_ba_session(struct net_device *dev, u8 *ra, u16 tid,
					u16 initiator, u16 reason)
{
	struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
	struct ieee80211_hw *hw = &local->hw;
	struct sta_info *sta;
1446
	int ret, i;
1447
	DECLARE_MAC_BUF(mac);
1448

1449
1450
	rcu_read_lock();

1451
	sta = sta_info_get(local, ra);
1452
1453
	if (!sta) {
		rcu_read_unlock();
1454
		return;
1455
	}
1456
1457
1458

	/* check if TID is in operational state */
	spin_lock_bh(&sta->ampdu_mlme.ampdu_rx);
1459
	if (sta->ampdu_mlme.tid_state_rx[tid]
1460
1461
				!= HT_AGG_STATE_OPERATIONAL) {
		spin_unlock_bh(&sta->ampdu_mlme.ampdu_rx);
1462
		rcu_read_unlock();
1463
1464
		return;
	}
1465
	sta->ampdu_mlme.tid_state_rx[tid] =
1466
1467