mlme.c 78.1 KB
Newer Older
1 2
/*
 * BSS client mode implementation
3
 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
4 5 6 7 8 9 10 11 12 13
 * Copyright 2004, Instant802 Networks, Inc.
 * Copyright 2005, Devicescape Software, Inc.
 * Copyright 2006-2007	Jiri Benc <jbenc@suse.cz>
 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

14
#include <linux/delay.h>
15 16 17 18 19 20
#include <linux/if_ether.h>
#include <linux/skbuff.h>
#include <linux/if_arp.h>
#include <linux/wireless.h>
#include <linux/random.h>
#include <linux/etherdevice.h>
21
#include <linux/rtnetlink.h>
22 23
#include <net/iw_handler.h>
#include <net/mac80211.h>
24
#include <asm/unaligned.h>
Johannes Berg's avatar
Johannes Berg committed
25

26
#include "ieee80211_i.h"
Johannes Berg's avatar
Johannes Berg committed
27 28
#include "rate.h"
#include "led.h"
29

30
#define IEEE80211_ASSOC_SCANS_MAX_TRIES 2
31 32 33 34 35 36 37 38 39
#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)
40
#define IEEE80211_IBSS_JOIN_TIMEOUT (7 * HZ)
41 42 43 44 45 46 47

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

#define IEEE80211_IBSS_MAX_STA_ENTRIES 128


48 49
/* utils */
static int ecw2cw(int ecw)
Johannes Berg's avatar
Johannes Berg committed
50
{
51
	return (1 << ecw) - 1;
Johannes Berg's avatar
Johannes Berg committed
52 53
}

54
static u8 *ieee80211_bss_get_ie(struct ieee80211_bss *bss, u8 ie)
55 56 57
{
	u8 *end, *pos;

58
	pos = bss->cbss.information_elements;
59 60
	if (pos == NULL)
		return NULL;
61
	end = pos + bss->cbss.len_information_elements;
62 63 64 65 66 67 68 69 70 71 72 73

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

	return NULL;
}

74
static int ieee80211_compatible_rates(struct ieee80211_bss *bss,
75
				      struct ieee80211_supported_band *sband,
76
				      u32 *rates)
77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94
{
	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;
}

95
/* also used by mesh code */
96
u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
97 98
			    struct ieee802_11_elems *elems,
			    enum ieee80211_band band)
Johannes Berg's avatar
Johannes Berg committed
99
{
100 101 102
	struct ieee80211_supported_band *sband;
	struct ieee80211_rate *bitrates;
	size_t num_rates;
103
	u32 supp_rates;
104 105
	int i, j;
	sband = local->hw.wiphy->bands[band];
Johannes Berg's avatar
Johannes Berg committed
106

107 108 109
	if (!sband) {
		WARN_ON(1);
		sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
Johannes Berg's avatar
Johannes Berg committed
110 111
	}

112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129
	bitrates = sband->bitrates;
	num_rates = sband->n_bitrates;
	supp_rates = 0;
	for (i = 0; i < elems->supp_rates_len +
		     elems->ext_supp_rates_len; i++) {
		u8 rate = 0;
		int own_rate;
		if (i < elems->supp_rates_len)
			rate = elems->supp_rates[i];
		else if (elems->ext_supp_rates)
			rate = elems->ext_supp_rates
				[i - elems->supp_rates_len];
		own_rate = 5 * (rate & 0x7f);
		for (j = 0; j < num_rates; j++)
			if (bitrates[j].bitrate == own_rate)
				supp_rates |= BIT(j);
	}
	return supp_rates;
Johannes Berg's avatar
Johannes Berg committed
130 131
}

132 133
/* frame sending functions */

134 135 136 137 138 139
static void add_extra_ies(struct sk_buff *skb, u8 *ies, size_t ies_len)
{
	if (ies)
		memcpy(skb_put(skb, ies_len), ies, ies_len);
}

140
/* also used by scanning code */
141 142
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
143 144 145 146 147 148 149 150
{
	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;

151 152
	skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200 +
			    sdata->u.sta.ie_probereq_len);
Johannes Berg's avatar
Johannes Berg committed
153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198
	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;
	}

199 200 201
	add_extra_ies(skb, sdata->u.sta.ie_probereq,
		      sdata->u.sta.ie_probereq_len);

202
	ieee80211_tx_skb(sdata, skb, 0);
Johannes Berg's avatar
Johannes Berg committed
203 204
}

205 206 207 208 209 210 211 212 213 214
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 +
215 216
			    sizeof(*mgmt) + 6 + extra_len +
			    sdata->u.sta.ie_auth_len);
217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238
	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);
239
	add_extra_ies(skb, sdata->u.sta.ie_auth, sdata->u.sta.ie_auth_len);
240 241 242 243

	ieee80211_tx_skb(sdata, skb, encrypt);
}

244 245 246 247 248 249
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;
250
	u8 *pos, *ies, *ht_ie, *e_ies;
251 252
	int i, len, count, rates_len, supp_rates_len;
	u16 capab;
253
	struct ieee80211_bss *bss;
254 255
	int wmm = 0;
	struct ieee80211_supported_band *sband;
256
	u32 rates = 0;
257 258 259 260 261 262 263 264 265
	size_t e_ies_len;

	if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) {
		e_ies = sdata->u.sta.ie_reassocreq;
		e_ies_len = sdata->u.sta.ie_reassocreq_len;
	} else {
		e_ies = sdata->u.sta.ie_assocreq;
		e_ies_len = sdata->u.sta.ie_assocreq_len;
	}
266 267 268

	skb = dev_alloc_skb(local->hw.extra_tx_headroom +
			    sizeof(*mgmt) + 200 + ifsta->extra_ie_len +
269
			    ifsta->ssid_len + e_ies_len);
270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291
	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) {
292
		if (bss->cbss.capability & WLAN_CAPABILITY_PRIVACY)
293 294 295 296 297 298 299 300 301 302
			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);

303
		if ((bss->cbss.capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
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
		    (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);
333
		mgmt->u.assoc_req.listen_interval =
334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414
				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 */
415 416 417 418 419 420
	/*
	 * IEEE802.11n does not allow TKIP/WEP as pairwise
	 * ciphers in HT mode. We still associate in non-ht
	 * mode (11a/b/g) if any one of these ciphers is
	 * configured as pairwise.
	 */
421
	if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED) &&
422 423
	    sband->ht_cap.ht_supported &&
	    (ht_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_INFORMATION)) &&
424 425
	    ht_ie[1] >= sizeof(struct ieee80211_ht_info) &&
	    (!(ifsta->flags & IEEE80211_STA_TKIP_WEP_USED))) {
426 427 428
		struct ieee80211_ht_info *ht_info =
			(struct ieee80211_ht_info *)(ht_ie + 2);
		u16 cap = sband->ht_cap.cap;
429 430 431
		__le16 tmp;
		u32 flags = local->hw.conf.channel->flags;

432 433
		switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
		case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
434
			if (flags & IEEE80211_CHAN_NO_FAT_ABOVE) {
435
				cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
436 437 438
				cap &= ~IEEE80211_HT_CAP_SGI_40;
			}
			break;
439
		case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
440
			if (flags & IEEE80211_CHAN_NO_FAT_BELOW) {
441
				cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
442 443 444 445 446 447 448 449 450 451 452 453 454
				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 */
455 456 457
		*pos++ = sband->ht_cap.ampdu_factor |
			 (sband->ht_cap.ampdu_density << 2);
		memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
458 459
	}

460 461
	add_extra_ies(skb, e_ies, e_ies_len);

462 463 464 465 466 467
	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);

468
	ieee80211_tx_skb(sdata, skb, 0);
469 470 471
}


472 473
static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
					   u16 stype, u16 reason)
474 475
{
	struct ieee80211_local *local = sdata->local;
476
	struct ieee80211_if_sta *ifsta = &sdata->u.sta;
477 478
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;
479 480
	u8 *ies;
	size_t ies_len;
481

482 483 484 485 486 487 488 489 490 491
	if (stype == IEEE80211_STYPE_DEAUTH) {
		ies = sdata->u.sta.ie_deauth;
		ies_len = sdata->u.sta.ie_deauth_len;
	} else {
		ies = sdata->u.sta.ie_disassoc;
		ies_len = sdata->u.sta.ie_disassoc_len;
	}

	skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) +
			    ies_len);
492
	if (!skb) {
493 494
		printk(KERN_DEBUG "%s: failed to allocate buffer for "
		       "deauth/disassoc frame\n", sdata->dev->name);
495 496 497 498 499 500 501 502 503
		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);
504
	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
505
	skb_put(skb, 2);
506
	/* u.deauth.reason_code == u.disassoc.reason_code */
507 508
	mgmt->u.deauth.reason_code = cpu_to_le16(reason);

509 510
	add_extra_ies(skb, ies, ies_len);

511
	ieee80211_tx_skb(sdata, skb, ifsta->flags & IEEE80211_STA_MFP_ENABLED);
512 513
}

514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546
void ieee80211_send_pspoll(struct ieee80211_local *local,
			   struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_sta *ifsta = &sdata->u.sta;
	struct ieee80211_pspoll *pspoll;
	struct sk_buff *skb;
	u16 fc;

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

	pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
	memset(pspoll, 0, sizeof(*pspoll));
	fc = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_PSPOLL | IEEE80211_FCTL_PM;
	pspoll->frame_control = cpu_to_le16(fc);
	pspoll->aid = cpu_to_le16(ifsta->aid);

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

	memcpy(pspoll->bssid, ifsta->bssid, ETH_ALEN);
	memcpy(pspoll->ta, sdata->dev->dev_addr, ETH_ALEN);

	ieee80211_tx_skb(sdata, skb, 0);

	return;
}

Johannes Berg's avatar
Johannes Berg committed
547
/* MLME */
548
static void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
549 550
					 const size_t supp_rates_len,
					 const u8 *supp_rates)
551 552 553 554 555
{
	struct ieee80211_local *local = sdata->local;
	int i, have_higher_than_11mbit = 0;

	/* cf. IEEE 802.11 9.2.12 */
556 557
	for (i = 0; i < supp_rates_len; i++)
		if ((supp_rates[i] & 0x7f) * 5 > 110)
558 559 560 561 562 563 564 565
			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;

566
	ieee80211_set_wmm_default(sdata);
567 568
}

569
static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
570 571 572 573 574 575 576 577
				     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;

578 579 580 581 582 583
	if (!(ifsta->flags & IEEE80211_STA_WMM_ENABLED))
		return;

	if (!wmm_param)
		return;

584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606
	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
607
			queue = 3;
Johannes Berg's avatar
Johannes Berg committed
608
			if (acm)
609 610 611
				local->wmm_acm |= BIT(0) | BIT(3);
			break;
		case 2:
Johannes Berg's avatar
Johannes Berg committed
612
			queue = 1;
Johannes Berg's avatar
Johannes Berg committed
613
			if (acm)
614 615 616
				local->wmm_acm |= BIT(4) | BIT(5);
			break;
		case 3:
Johannes Berg's avatar
Johannes Berg committed
617
			queue = 0;
Johannes Berg's avatar
Johannes Berg committed
618
			if (acm)
619 620 621 622
				local->wmm_acm |= BIT(6) | BIT(7);
			break;
		case 0:
		default:
Johannes Berg's avatar
Johannes Berg committed
623
			queue = 2;
Johannes Berg's avatar
Johannes Berg committed
624
			if (acm)
625 626 627 628 629 630 631
				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);
632
		params.txop = get_unaligned_le16(pos + 2);
633
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
634
		printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
635
		       "cWmin=%d cWmax=%d txop=%d\n",
636
		       local->mdev->name, queue, aci, acm, params.aifs, params.cw_min,
637 638
		       params.cw_max, params.txop);
#endif
639 640 641 642
		/* 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 "
643
			       "parameters for queue %d\n", local->mdev->name, queue);
644 645 646 647
		}
	}
}

648
static bool ieee80211_check_tim(struct ieee802_11_elems *elems, u16 aid)
649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668
{
	u8 mask;
	u8 index, indexn1, indexn2;
	struct ieee80211_tim_ie *tim = (struct ieee80211_tim_ie *) elems->tim;

	aid &= 0x3fff;
	index = aid / 8;
	mask  = 1 << (aid & 7);

	indexn1 = tim->bitmap_ctrl & 0xfe;
	indexn2 = elems->tim_len + indexn1 - 4;

	if (index < indexn1 || index > indexn2)
		return false;

	index -= indexn1;

	return !!(tim->virtual_map[index] & mask);
}

669 670
static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
					   u16 capab, bool erp_valid, u8 erp)
671
{
672
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
673
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
674
	struct ieee80211_if_sta *ifsta = &sdata->u.sta;
675
#endif
676
	u32 changed = 0;
677 678 679 680 681 682 683 684 685 686 687 688 689
	bool use_protection;
	bool use_short_preamble;
	bool use_short_slot;

	if (erp_valid) {
		use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
		use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
	} else {
		use_protection = false;
		use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
	}

	use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
690

691
	if (use_protection != bss_conf->use_cts_prot) {
692
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
693
		if (net_ratelimit()) {
694
			printk(KERN_DEBUG "%s: CTS protection %s (BSSID=%pM)\n",
695
			       sdata->dev->name,
696
			       use_protection ? "enabled" : "disabled",
697
			       ifsta->bssid);
698
		}
699
#endif
700 701
		bss_conf->use_cts_prot = use_protection;
		changed |= BSS_CHANGED_ERP_CTS_PROT;
702
	}
703

704
	if (use_short_preamble != bss_conf->use_short_preamble) {
705
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
706 707
		if (net_ratelimit()) {
			printk(KERN_DEBUG "%s: switched to %s barker preamble"
708
			       " (BSSID=%pM)\n",
709
			       sdata->dev->name,
710
			       use_short_preamble ? "short" : "long",
711
			       ifsta->bssid);
712
		}
713
#endif
714
		bss_conf->use_short_preamble = use_short_preamble;
715
		changed |= BSS_CHANGED_ERP_PREAMBLE;
716
	}
717

718 719 720
	if (use_short_slot != bss_conf->use_short_slot) {
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
		if (net_ratelimit()) {
721 722
			printk(KERN_DEBUG "%s: switched to %s slot time"
			       " (BSSID=%pM)\n",
723 724 725 726 727 728 729
			       sdata->dev->name,
			       use_short_slot ? "short" : "long",
			       ifsta->bssid);
		}
#endif
		bss_conf->use_short_slot = use_short_slot;
		changed |= BSS_CHANGED_ERP_SLOT;
730 731 732 733 734
	}

	return changed;
}

735 736 737 738 739 740 741 742 743 744 745
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);
}

746
static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata,
747 748
					 struct ieee80211_if_sta *ifsta)
{
749 750 751
	char *buf;
	size_t len;
	int i;
752 753
	union iwreq_data wrqu;

754 755 756 757 758 759 760 761 762
	if (!ifsta->assocreq_ies && !ifsta->assocresp_ies)
		return;

	buf = kmalloc(50 + 2 * (ifsta->assocreq_ies_len +
				ifsta->assocresp_ies_len), GFP_KERNEL);
	if (!buf)
		return;

	len = sprintf(buf, "ASSOCINFO(");
763
	if (ifsta->assocreq_ies) {
764 765 766 767 768
		len += sprintf(buf + len, "ReqIEs=");
		for (i = 0; i < ifsta->assocreq_ies_len; i++) {
			len += sprintf(buf + len, "%02x",
				       ifsta->assocreq_ies[i]);
		}
769
	}
770
	if (ifsta->assocresp_ies) {
771 772 773 774 775 776 777
		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]);
		}
778
	}
779 780 781 782 783 784 785 786 787 788
	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]);
		}
	}

789 790 791 792 793
	if (len <= IW_CUSTOM_MAX) {
		memset(&wrqu, 0, sizeof(wrqu));
		wrqu.data.length = len;
		wireless_send_event(sdata->dev, IWEVCUSTOM, &wrqu, buf);
	}
794 795

	kfree(buf);
796 797 798
}


799
static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
Johannes Berg's avatar
Johannes Berg committed
800 801
				     struct ieee80211_if_sta *ifsta,
				     u32 bss_info_changed)
802
{
803
	struct ieee80211_local *local = sdata->local;
Tomas Winkler's avatar
Tomas Winkler committed
804
	struct ieee80211_conf *conf = &local_to_hw(local)->conf;
805

806
	struct ieee80211_bss *bss;
807

Johannes Berg's avatar
Johannes Berg committed
808
	bss_info_changed |= BSS_CHANGED_ASSOC;
809
	ifsta->flags |= IEEE80211_STA_ASSOCIATED;
810

811 812 813 814 815
	bss = ieee80211_rx_bss_get(local, ifsta->bssid,
				   conf->channel->center_freq,
				   ifsta->ssid, ifsta->ssid_len);
	if (bss) {
		/* set timing information */
816 817
		sdata->vif.bss_conf.beacon_int = bss->cbss.beacon_interval;
		sdata->vif.bss_conf.timestamp = bss->cbss.tsf;
818
		sdata->vif.bss_conf.dtim_period = bss->dtim_period;
819

Johannes Berg's avatar
Johannes Berg committed
820
		bss_info_changed |= ieee80211_handle_bss_capability(sdata,
821
			bss->cbss.capability, bss->has_erp_value, bss->erp_value);
822 823

		ieee80211_rx_bss_put(local, bss);
824 825
	}

826 827 828
	ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
	memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN);
	ieee80211_sta_send_associnfo(sdata, ifsta);
829

830 831
	ifsta->last_probe = jiffies;
	ieee80211_led_assoc(local, 1);
832

833
	sdata->vif.bss_conf.assoc = 1;
834 835 836 837 838
	/*
	 * For now just always ask the driver to update the basic rateset
	 * when we have associated, we aren't checking whether it actually
	 * changed or not.
	 */
Johannes Berg's avatar
Johannes Berg committed
839 840
	bss_info_changed |= BSS_CHANGED_BASIC_RATES;
	ieee80211_bss_info_change_notify(sdata, bss_info_changed);
841

842 843 844
	if (local->powersave) {
		if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS) &&
		    local->hw.conf.dynamic_ps_timeout > 0) {
845
			mod_timer(&local->dynamic_ps_timer, jiffies +
846 847
				  msecs_to_jiffies(
					local->hw.conf.dynamic_ps_timeout));
848 849 850
		} else {
			if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
				ieee80211_send_nullfunc(local, sdata, 1);
851
			conf->flags |= IEEE80211_CONF_PS;
852
			ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
853
		}
854 855
	}

856 857
	netif_tx_start_all_queues(sdata->dev);
	netif_carrier_on(sdata->dev);
858

859
	ieee80211_sta_send_apinfo(sdata, ifsta);
860 861
}

862 863
static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata,
				   struct ieee80211_if_sta *ifsta)
864
{
865 866
	ifsta->direct_probe_tries++;
	if (ifsta->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
867 868
		printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
		       sdata->dev->name, ifsta->bssid);
869
		ifsta->state = IEEE80211_STA_MLME_DISABLED;
870
		ieee80211_sta_send_apinfo(sdata, ifsta);
871 872 873 874 875 876 877 878

		/*
		 * Most likely AP is not in the range so remove the
		 * bss information associated to the AP
		 */
		ieee80211_rx_bss_remove(sdata, ifsta->bssid,
				sdata->local->hw.conf.channel->center_freq,
				ifsta->ssid, ifsta->ssid_len);
879 880 881
		return;
	}

882 883
	printk(KERN_DEBUG "%s: direct probe to AP %pM try %d\n",
			sdata->dev->name, ifsta->bssid,
884
			ifsta->direct_probe_tries);
885

886
	ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
887

888 889 890 891 892 893 894 895 896
	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
897
}
898

899 900 901

static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
				   struct ieee80211_if_sta *ifsta)
902
{
903 904
	ifsta->auth_tries++;
	if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
905
		printk(KERN_DEBUG "%s: authentication with AP %pM"
906
		       " timed out\n",
907
		       sdata->dev->name, ifsta->bssid);
908
		ifsta->state = IEEE80211_STA_MLME_DISABLED;
909
		ieee80211_sta_send_apinfo(sdata, ifsta);
910 911 912
		ieee80211_rx_bss_remove(sdata, ifsta->bssid,
				sdata->local->hw.conf.channel->center_freq,
				ifsta->ssid, ifsta->ssid_len);
913 914 915
		return;
	}

916
	ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
917 918
	printk(KERN_DEBUG "%s: authenticate with AP %pM\n",
	       sdata->dev->name, ifsta->bssid);
919

920 921 922
	ieee80211_send_auth(sdata, ifsta, 1, NULL, 0, 0);

	mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
923 924
}

925 926 927 928
/*
 * The disassoc 'reason' argument can be either our own reason
 * if self disconnected or a reason code from the AP.
 */
929 930 931 932 933 934
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;
935
	u32 changed = 0, config_changed = 0;
936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951

	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;

952
	netif_tx_stop_all_queues(sdata->dev);
953 954
	netif_carrier_off(sdata->dev);

955
	ieee80211_sta_tear_down_BA_sessions(sta);
956 957 958

	if (self_disconnected) {
		if (deauth)
959 960
			ieee80211_send_deauth_disassoc(sdata,
				IEEE80211_STYPE_DEAUTH, reason);
961
		else
962 963
			ieee80211_send_deauth_disassoc(sdata,
				IEEE80211_STYPE_DISASSOC, reason);
964 965
	}

966 967 968 969
	ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
	changed |= ieee80211_reset_erp_info(sdata);

	ieee80211_led_assoc(local, 0);
Johannes Berg's avatar
Johannes Berg committed
970 971
	changed |= BSS_CHANGED_ASSOC;
	sdata->vif.bss_conf.assoc = false;
972 973

	ieee80211_sta_send_apinfo(sdata, ifsta);
974

975
	if (self_disconnected || reason == WLAN_REASON_DISASSOC_STA_HAS_LEFT) {
976
		ifsta->state = IEEE80211_STA_MLME_DISABLED;
977 978 979 980
		ieee80211_rx_bss_remove(sdata, ifsta->bssid,
				sdata->local->hw.conf.channel->center_freq,
				ifsta->ssid, ifsta->ssid_len);
	}
981 982 983

	rcu_read_unlock();

984
	/* channel(_type) changes are handled by ieee80211_hw_config */
Sujith's avatar
Sujith committed
985
	local->oper_channel_type = NL80211_CHAN_NO_HT;
986

987 988
	local->power_constr_level = 0;

989 990 991
	del_timer_sync(&local->dynamic_ps_timer);
	cancel_work_sync(&local->dynamic_ps_enable_work);

992 993 994 995
	if (local->hw.conf.flags & IEEE80211_CONF_PS) {
		local->hw.conf.flags &= ~IEEE80211_CONF_PS;
		config_changed |= IEEE80211_CONF_CHANGE_PS;
	}
Johannes Berg's avatar
Johannes Berg committed
996

997
	ieee80211_hw_config(local, config_changed);
Johannes Berg's avatar
Johannes Berg committed
998
	ieee80211_bss_info_change_notify(sdata, changed);
999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012

	rcu_read_lock();

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

	sta_info_unlink(&sta);

	rcu_read_unlock();

	sta_info_destroy(sta);
1013
}
1014

1015 1016 1017 1018 1019 1020 1021 1022
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;
}

1023
static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata,
1024 1025
				      struct ieee80211_if_sta *ifsta)
{
1026
	struct ieee80211_local *local = sdata->local;
1027
	struct ieee80211_bss *bss;
1028 1029 1030
	int bss_privacy;
	int wep_privacy;
	int privacy_invoked;
1031

1032
	if (!ifsta || (ifsta->flags & IEEE80211_STA_MIXED_CELL))
1033 1034
		return 0;

1035
	bss = ieee80211_rx_bss_get(local, ifsta->bssid,
1036
				   local->hw.conf.channel->center_freq,
1037
				   ifsta->ssid, ifsta->ssid_len);
1038 1039 1040
	if (!bss)
		return 0;

1041
	bss_privacy = !!(bss->cbss.capability & WLAN_CAPABILITY_PRIVACY);
1042
	wep_privacy = !!ieee80211_sta_wep_configured(sdata);
1043
	privacy_invoked = !!(ifsta->flags & IEEE80211_STA_PRIVACY_INVOKED);
1044

1045
	ieee80211_rx_bss_put(local, bss);
1046

1047 1048 1049 1050
	if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
		return 0;

	return 1;
1051 1052
}

1053
static void ieee80211_associate(struct ieee80211_sub_if_data *sdata,
1054 1055 1056 1057
				struct ieee80211_if_sta *ifsta)
{
	ifsta->assoc_tries++;
	if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
1058
		printk(KERN_DEBUG "%s: association with AP %pM"
1059
		       " timed out\n",
1060
		       sdata->dev->name, ifsta->bssid);
1061
		ifsta->state = IEEE80211_STA_MLME_DISABLED;
1062
		ieee80211_sta_send_apinfo(sdata, ifsta);
1063 1064 1065
		ieee80211_rx_bss_remove(sdata, ifsta->bssid,
				sdata->local->hw.conf.channel->center_freq,
				ifsta->ssid, ifsta->ssid_len);
1066 1067 1068
		return;
	}

1069
	ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
1070 1071
	printk(KERN_DEBUG "%s: associate with AP %pM\n",
	       sdata->dev->name, ifsta->bssid);
1072
	if (ieee80211_privacy_mismatch(sdata, ifsta)) {
1073
		printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
1074
		       "mixed-cell disabled - abort association\n", sdata->dev->name);
1075
		ifsta->state = IEEE80211_STA_MLME_DISABLED;
1076 1077 1078
		return;
	}

1079
	ieee80211_send_assoc(sdata, ifsta);
1080 1081 1082 1083 1084

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


1085
static void ieee80211_associated(struct ieee80211_sub_if_data *sdata,
1086 1087
				 struct ieee80211_if_sta *ifsta)
{
1088
	struct ieee80211_local *local = sdata->local;
1089 1090 1091 1092 1093 1094 1095 1096
	struct sta_info *sta;
	int disassoc;

	/* 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 */

1097
	ifsta->state = IEEE80211_STA_MLME_ASSOCIATED;
1098

1099 1100
	rcu_read_lock();

1101 1102
	sta = sta_info_get(local, ifsta->bssid);
	if (!sta) {
1103 1104
		printk(KERN_DEBUG "%s: No STA entry for own AP %pM\n",
		       sdata->dev->name, ifsta->bssid);
1105