mlme.c 71.9 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13
/*
 * BSS client mode implementation
 * Copyright 2003, Jouni Malinen <jkmaline@cc.hut.fi>
 * Copyright 2004, Instant802 Networks, Inc.
 * Copyright 2005, Devicescape Software, Inc.
 * Copyright 2006-2007	Jiri Benc <jbenc@suse.cz>
 * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

14
#include <linux/delay.h>
15 16 17 18 19 20
#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 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73
{
	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;
}

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

95 96 97 98
/* also used by mesh code */
u64 ieee80211_sta_get_rates(struct ieee80211_local *local,
			    struct ieee802_11_elems *elems,
			    enum ieee80211_band band)
Johannes Berg's avatar
Johannes Berg committed
99
{
100 101 102 103 104 105
	struct ieee80211_supported_band *sband;
	struct ieee80211_rate *bitrates;
	size_t num_rates;
	u64 supp_rates;
	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
}

132 133 134
/* frame sending functions */

/* also used by scanning code */
135 136
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
137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_supported_band *sband;
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;
	u8 *pos, *supp_rates, *esupp_rates = NULL;
	int i;

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

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

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

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

192
	ieee80211_tx_skb(sdata, skb, 0);
Johannes Berg's avatar
Johannes Berg committed
193 194
}

195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231
static void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
				struct ieee80211_if_sta *ifsta,
				int transaction, u8 *extra, size_t extra_len,
				int encrypt)
{
	struct ieee80211_local *local = sdata->local;
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;

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

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

	ieee80211_tx_skb(sdata, skb, encrypt);
}

232 233 234 235 236 237
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;
238
	u8 *pos, *ies, *ht_ie;
239 240
	int i, len, count, rates_len, supp_rates_len;
	u16 capab;
241
	struct ieee80211_bss *bss;
242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311
	int wmm = 0;
	struct ieee80211_supported_band *sband;
	u64 rates = 0;

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

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

	capab = ifsta->capab;

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

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

		/* get all rates supported by the device and the AP as
		 * some APs don't like getting a superset of their rates
		 * in the association request (e.g. D-Link DAP 1353 in
		 * b-only mode) */
		rates_len = ieee80211_compatible_rates(bss, sband, &rates);

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

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

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

	if (ifsta->flags & IEEE80211_STA_PREV_BSSID_SET) {
		skb_put(skb, 10);
		mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
						  IEEE80211_STYPE_REASSOC_REQ);
		mgmt->u.reassoc_req.capab_info = cpu_to_le16(capab);
		mgmt->u.reassoc_req.listen_interval =
				cpu_to_le16(local->hw.conf.listen_interval);
		memcpy(mgmt->u.reassoc_req.current_ap, ifsta->prev_bssid,
		       ETH_ALEN);
	} else {
		skb_put(skb, 4);
		mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
						  IEEE80211_STYPE_ASSOC_REQ);
		mgmt->u.assoc_req.capab_info = cpu_to_le16(capab);
312
		mgmt->u.assoc_req.listen_interval =
313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394
				cpu_to_le16(local->hw.conf.listen_interval);
	}

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

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

	len = sband->n_bitrates;
	pos = skb_put(skb, supp_rates_len + 2);
	*pos++ = WLAN_EID_SUPP_RATES;
	*pos++ = supp_rates_len;

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

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

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

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

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

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

	if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED)) {
		pos = skb_put(skb, 9);
		*pos++ = WLAN_EID_VENDOR_SPECIFIC;
		*pos++ = 7; /* len */
		*pos++ = 0x00; /* Microsoft OUI 00:50:F2 */
		*pos++ = 0x50;
		*pos++ = 0xf2;
		*pos++ = 2; /* WME */
		*pos++ = 0; /* WME info */
		*pos++ = 1; /* WME ver */
		*pos++ = 0;
	}

	/* wmm support is a must to HT */
	if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED) &&
395 396 397 398 399 400
	    sband->ht_cap.ht_supported &&
	    (ht_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_INFORMATION)) &&
	    ht_ie[1] >= sizeof(struct ieee80211_ht_info)) {
		struct ieee80211_ht_info *ht_info =
			(struct ieee80211_ht_info *)(ht_ie + 2);
		u16 cap = sband->ht_cap.cap;
401 402 403
		__le16 tmp;
		u32 flags = local->hw.conf.channel->flags;

404 405
		switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
		case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
406
			if (flags & IEEE80211_CHAN_NO_FAT_ABOVE) {
407
				cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
408 409 410
				cap &= ~IEEE80211_HT_CAP_SGI_40;
			}
			break;
411
		case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
412
			if (flags & IEEE80211_CHAN_NO_FAT_BELOW) {
413
				cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
414 415 416 417 418 419 420 421 422 423 424 425 426
				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 */
427 428 429
		*pos++ = sband->ht_cap.ampdu_factor |
			 (sband->ht_cap.ampdu_density << 2);
		memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
430 431 432 433 434 435 436 437
	}

	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);

438
	ieee80211_tx_skb(sdata, skb, 0);
439 440 441
}


442 443
static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
					   u16 stype, u16 reason)
444 445
{
	struct ieee80211_local *local = sdata->local;
446
	struct ieee80211_if_sta *ifsta = &sdata->u.sta;
447 448 449 450 451
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;

	skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
	if (!skb) {
452 453
		printk(KERN_DEBUG "%s: failed to allocate buffer for "
		       "deauth/disassoc frame\n", sdata->dev->name);
454 455 456 457 458 459 460 461 462
		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);
463
	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
464
	skb_put(skb, 2);
465
	/* u.deauth.reason_code == u.disassoc.reason_code */
466 467
	mgmt->u.deauth.reason_code = cpu_to_le16(reason);

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

Johannes Berg's avatar
Johannes Berg committed
471
/* MLME */
472
static void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
473
					 struct ieee80211_bss *bss)
474 475 476 477 478 479 480 481 482 483 484 485 486 487 488
{
	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;

489
	ieee80211_set_wmm_default(sdata);
490 491
}

492
static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
493 494 495 496 497 498 499 500
				     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;

501 502 503 504 505 506
	if (!(ifsta->flags & IEEE80211_STA_WMM_ENABLED))
		return;

	if (!wmm_param)
		return;

507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529
	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
530
			queue = 3;
Johannes Berg's avatar
Johannes Berg committed
531
			if (acm)
532 533 534
				local->wmm_acm |= BIT(0) | BIT(3);
			break;
		case 2:
Johannes Berg's avatar
Johannes Berg committed
535
			queue = 1;
Johannes Berg's avatar
Johannes Berg committed
536
			if (acm)
537 538 539
				local->wmm_acm |= BIT(4) | BIT(5);
			break;
		case 3:
Johannes Berg's avatar
Johannes Berg committed
540
			queue = 0;
Johannes Berg's avatar
Johannes Berg committed
541
			if (acm)
542 543 544 545
				local->wmm_acm |= BIT(6) | BIT(7);
			break;
		case 0:
		default:
Johannes Berg's avatar
Johannes Berg committed
546
			queue = 2;
Johannes Berg's avatar
Johannes Berg committed
547
			if (acm)
548 549 550 551 552 553 554
				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);
555
		params.txop = get_unaligned_le16(pos + 2);
556
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
557
		printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
558
		       "cWmin=%d cWmax=%d txop=%d\n",
559
		       local->mdev->name, queue, aci, acm, params.aifs, params.cw_min,
560 561
		       params.cw_max, params.txop);
#endif
562 563 564 565
		/* 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 "
566
			       "parameters for queue %d\n", local->mdev->name, queue);
567 568 569 570
		}
	}
}

571 572
static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
					   u16 capab, bool erp_valid, u8 erp)
573
{
574
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
575
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
576
	struct ieee80211_if_sta *ifsta = &sdata->u.sta;
577
#endif
578
	u32 changed = 0;
579 580 581 582 583 584 585 586 587 588 589 590 591
	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);
592

593
	if (use_protection != bss_conf->use_cts_prot) {
594
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
595
		if (net_ratelimit()) {
596
			printk(KERN_DEBUG "%s: CTS protection %s (BSSID=%pM)\n",
597
			       sdata->dev->name,
598
			       use_protection ? "enabled" : "disabled",
599
			       ifsta->bssid);
600
		}
601
#endif
602 603
		bss_conf->use_cts_prot = use_protection;
		changed |= BSS_CHANGED_ERP_CTS_PROT;
604
	}
605

606
	if (use_short_preamble != bss_conf->use_short_preamble) {
607
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
608 609
		if (net_ratelimit()) {
			printk(KERN_DEBUG "%s: switched to %s barker preamble"
610
			       " (BSSID=%pM)\n",
611
			       sdata->dev->name,
612
			       use_short_preamble ? "short" : "long",
613
			       ifsta->bssid);
614
		}
615
#endif
616
		bss_conf->use_short_preamble = use_short_preamble;
617
		changed |= BSS_CHANGED_ERP_PREAMBLE;
618
	}
619

620 621 622 623 624 625 626 627 628 629 630 631
	if (use_short_slot != bss_conf->use_short_slot) {
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
		if (net_ratelimit()) {
			printk(KERN_DEBUG "%s: switched to %s slot"
			       " (BSSID=%s)\n",
			       sdata->dev->name,
			       use_short_slot ? "short" : "long",
			       ifsta->bssid);
		}
#endif
		bss_conf->use_short_slot = use_short_slot;
		changed |= BSS_CHANGED_ERP_SLOT;
632 633 634 635 636
	}

	return changed;
}

637 638 639 640 641 642 643 644 645 646 647
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);
}

648
static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata,
649 650
					 struct ieee80211_if_sta *ifsta)
{
651 652 653
	char *buf;
	size_t len;
	int i;
654 655
	union iwreq_data wrqu;

656 657 658 659 660 661 662 663 664
	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(");
665
	if (ifsta->assocreq_ies) {
666 667 668 669 670
		len += sprintf(buf + len, "ReqIEs=");
		for (i = 0; i < ifsta->assocreq_ies_len; i++) {
			len += sprintf(buf + len, "%02x",
				       ifsta->assocreq_ies[i]);
		}
671
	}
672
	if (ifsta->assocresp_ies) {
673 674 675 676 677 678 679
		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]);
		}
680
	}
681 682 683 684 685 686 687 688 689 690
	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]);
		}
	}

691 692 693 694 695
	if (len <= IW_CUSTOM_MAX) {
		memset(&wrqu, 0, sizeof(wrqu));
		wrqu.data.length = len;
		wireless_send_event(sdata->dev, IWEVCUSTOM, &wrqu, buf);
	}
696 697

	kfree(buf);
698 699 700
}


701
static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
Johannes Berg's avatar
Johannes Berg committed
702 703
				     struct ieee80211_if_sta *ifsta,
				     u32 bss_info_changed)
704
{
705
	struct ieee80211_local *local = sdata->local;
Tomas Winkler's avatar
Tomas Winkler committed
706
	struct ieee80211_conf *conf = &local_to_hw(local)->conf;
707

708
	struct ieee80211_bss *bss;
709

Johannes Berg's avatar
Johannes Berg committed
710
	bss_info_changed |= BSS_CHANGED_ASSOC;
711
	ifsta->flags |= IEEE80211_STA_ASSOCIATED;
712

713
	if (sdata->vif.type != NL80211_IFTYPE_STATION)
714
		return;
715

716 717 718 719 720
	bss = ieee80211_rx_bss_get(local, ifsta->bssid,
				   conf->channel->center_freq,
				   ifsta->ssid, ifsta->ssid_len);
	if (bss) {
		/* set timing information */
721 722 723
		sdata->vif.bss_conf.beacon_int = bss->beacon_int;
		sdata->vif.bss_conf.timestamp = bss->timestamp;
		sdata->vif.bss_conf.dtim_period = bss->dtim_period;
724

Johannes Berg's avatar
Johannes Berg committed
725
		bss_info_changed |= ieee80211_handle_bss_capability(sdata,
726
			bss->capability, bss->has_erp_value, bss->erp_value);
727 728

		ieee80211_rx_bss_put(local, bss);
729 730
	}

731 732 733
	ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
	memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN);
	ieee80211_sta_send_associnfo(sdata, ifsta);
734

735 736
	ifsta->last_probe = jiffies;
	ieee80211_led_assoc(local, 1);
737

738
	sdata->vif.bss_conf.assoc = 1;
739 740 741 742 743
	/*
	 * 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
744 745
	bss_info_changed |= BSS_CHANGED_BASIC_RATES;
	ieee80211_bss_info_change_notify(sdata, bss_info_changed);
746

747
	if (local->powersave) {
748 749 750 751 752 753 754 755
		if (local->dynamic_ps_timeout > 0)
			mod_timer(&local->dynamic_ps_timer, jiffies +
				  msecs_to_jiffies(local->dynamic_ps_timeout));
		else {
			conf->flags |= IEEE80211_CONF_PS;
			ieee80211_hw_config(local,
					    IEEE80211_CONF_CHANGE_PS);
		}
756 757
	}

758 759
	netif_tx_start_all_queues(sdata->dev);
	netif_carrier_on(sdata->dev);
760

761
	ieee80211_sta_send_apinfo(sdata, ifsta);
762 763
}

764 765
static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata,
				   struct ieee80211_if_sta *ifsta)
766
{
767 768
	ifsta->direct_probe_tries++;
	if (ifsta->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
769 770
		printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
		       sdata->dev->name, ifsta->bssid);
771
		ifsta->state = IEEE80211_STA_MLME_DISABLED;
772
		ieee80211_sta_send_apinfo(sdata, ifsta);
773 774 775
		return;
	}

776 777
	printk(KERN_DEBUG "%s: direct probe to AP %pM try %d\n",
			sdata->dev->name, ifsta->bssid,
778
			ifsta->direct_probe_tries);
779

780
	ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
781

782 783 784 785 786 787 788 789 790
	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
791
}
792

793 794 795

static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
				   struct ieee80211_if_sta *ifsta)
796
{
797 798
	ifsta->auth_tries++;
	if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
799
		printk(KERN_DEBUG "%s: authentication with AP %pM"
800
		       " timed out\n",
801
		       sdata->dev->name, ifsta->bssid);
802
		ifsta->state = IEEE80211_STA_MLME_DISABLED;
803
		ieee80211_sta_send_apinfo(sdata, ifsta);
804 805 806
		return;
	}

807
	ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
808 809
	printk(KERN_DEBUG "%s: authenticate with AP %pM\n",
	       sdata->dev->name, ifsta->bssid);
810

811 812 813
	ieee80211_send_auth(sdata, ifsta, 1, NULL, 0, 0);

	mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
814 815
}

816 817 818 819
/*
 * The disassoc 'reason' argument can be either our own reason
 * if self disconnected or a reason code from the AP.
 */
820 821 822 823 824 825
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;
826
	u32 changed = 0, config_changed = 0;
827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842

	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;

843
	netif_tx_stop_all_queues(sdata->dev);
844 845
	netif_carrier_off(sdata->dev);

846
	ieee80211_sta_tear_down_BA_sessions(sdata, sta->sta.addr);
847 848 849

	if (self_disconnected) {
		if (deauth)
850 851
			ieee80211_send_deauth_disassoc(sdata,
				IEEE80211_STYPE_DEAUTH, reason);
852
		else
853 854
			ieee80211_send_deauth_disassoc(sdata,
				IEEE80211_STYPE_DISASSOC, reason);
855 856
	}

857 858 859 860
	ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
	changed |= ieee80211_reset_erp_info(sdata);

	ieee80211_led_assoc(local, 0);
Johannes Berg's avatar
Johannes Berg committed
861 862
	changed |= BSS_CHANGED_ASSOC;
	sdata->vif.bss_conf.assoc = false;
863 864

	ieee80211_sta_send_apinfo(sdata, ifsta);
865

866
	if (self_disconnected || reason == WLAN_REASON_DISASSOC_STA_HAS_LEFT)
867 868 869 870
		ifsta->state = IEEE80211_STA_MLME_DISABLED;

	rcu_read_unlock();

Johannes Berg's avatar
Johannes Berg committed
871
	local->hw.conf.ht.enabled = false;
Sujith's avatar
Sujith committed
872
	local->oper_channel_type = NL80211_CHAN_NO_HT;
873 874
	config_changed |= IEEE80211_CONF_CHANGE_HT;

875 876 877
	del_timer_sync(&local->dynamic_ps_timer);
	cancel_work_sync(&local->dynamic_ps_enable_work);

878 879 880 881
	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
882

883
	ieee80211_hw_config(local, config_changed);
Johannes Berg's avatar
Johannes Berg committed
884
	ieee80211_bss_info_change_notify(sdata, changed);
885 886 887 888 889 890 891 892 893 894 895 896 897 898

	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);
899
}
900

901 902 903 904 905 906 907 908
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;
}

909
static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata,
910 911
				      struct ieee80211_if_sta *ifsta)
{
912
	struct ieee80211_local *local = sdata->local;
913
	struct ieee80211_bss *bss;
914 915 916
	int bss_privacy;
	int wep_privacy;
	int privacy_invoked;
917

918
	if (!ifsta || (ifsta->flags & IEEE80211_STA_MIXED_CELL))
919 920
		return 0;

921
	bss = ieee80211_rx_bss_get(local, ifsta->bssid,
922
				   local->hw.conf.channel->center_freq,
923
				   ifsta->ssid, ifsta->ssid_len);
924 925 926
	if (!bss)
		return 0;

927
	bss_privacy = !!(bss->capability & WLAN_CAPABILITY_PRIVACY);
928
	wep_privacy = !!ieee80211_sta_wep_configured(sdata);
929
	privacy_invoked = !!(ifsta->flags & IEEE80211_STA_PRIVACY_INVOKED);
930

931
	ieee80211_rx_bss_put(local, bss);
932

933 934 935 936
	if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
		return 0;

	return 1;
937 938
}

939
static void ieee80211_associate(struct ieee80211_sub_if_data *sdata,
940 941 942 943
				struct ieee80211_if_sta *ifsta)
{
	ifsta->assoc_tries++;
	if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
944
		printk(KERN_DEBUG "%s: association with AP %pM"
945
		       " timed out\n",
946
		       sdata->dev->name, ifsta->bssid);
947
		ifsta->state = IEEE80211_STA_MLME_DISABLED;
948
		ieee80211_sta_send_apinfo(sdata, ifsta);
949 950 951
		return;
	}

952
	ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
953 954
	printk(KERN_DEBUG "%s: associate with AP %pM\n",
	       sdata->dev->name, ifsta->bssid);
955
	if (ieee80211_privacy_mismatch(sdata, ifsta)) {
956
		printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
957
		       "mixed-cell disabled - abort association\n", sdata->dev->name);
958
		ifsta->state = IEEE80211_STA_MLME_DISABLED;
959 960 961
		return;
	}

962
	ieee80211_send_assoc(sdata, ifsta);
963 964 965 966 967

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


968
static void ieee80211_associated(struct ieee80211_sub_if_data *sdata,
969 970
				 struct ieee80211_if_sta *ifsta)
{
971
	struct ieee80211_local *local = sdata->local;
972 973 974 975 976 977 978 979
	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 */

980
	ifsta->state = IEEE80211_STA_MLME_ASSOCIATED;
981

982 983
	rcu_read_lock();

984 985
	sta = sta_info_get(local, ifsta->bssid);
	if (!sta) {
986 987
		printk(KERN_DEBUG "%s: No STA entry for own AP %pM\n",
		       sdata->dev->name, ifsta->bssid);
988 989 990 991 992
		disassoc = 1;
	} else {
		disassoc = 0;
		if (time_after(jiffies,
			       sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
993
			if (ifsta->flags & IEEE80211_STA_PROBEREQ_POLL) {
994
				printk(KERN_DEBUG "%s: No ProbeResp from "
995
				       "current AP %pM - assume out of "
996
				       "range\n",
997
				       sdata->dev->name, ifsta->bssid);
998
				disassoc = 1;
999
			} else
1000
				ieee80211_send_probe_req(sdata, ifsta->bssid,
1001 1002
							 ifsta->ssid,
							 ifsta->ssid_len);
1003
			ifsta->flags ^= IEEE80211_STA_PROBEREQ_POLL;
1004
		} else {
1005
			ifsta->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1006 1007 1008
			if (time_after(jiffies, ifsta->last_probe +
				       IEEE80211_PROBE_INTERVAL)) {
				ifsta->last_probe = jiffies;
1009
				ieee80211_send_probe_req(sdata, ifsta->bssid,
1010 1011 1012 1013 1014
							 ifsta->ssid,
							 ifsta->ssid_len);
			}
		}
	}
1015 1016 1017

	rcu_read_unlock();

Johannes Berg's avatar
Johannes Berg committed
1018 1019 1020 1021 1022 1023
	if (disassoc)
		ieee80211_set_disassoc(sdata, ifsta, true, true,
					WLAN_REASON_PREV_AUTH_NOT_VALID);
	else
		mod_timer(&ifsta->timer, jiffies +
				      IEEE80211_MONITORING_INTERVAL);
1024 1025 1026
}


1027
static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata,
1028 1029
				     struct ieee80211_if_sta *ifsta)
{
1030
	printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1031
	ifsta->flags |= IEEE80211_STA_AUTHENTICATED;
1032
	ieee80211_associate(sdata, ifsta);
1033 1034 1035
}


1036
static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1037 1038 1039 1040 1041 1042 1043 1044
				     struct ieee80211_if_sta *ifsta,
				     struct ieee80211_mgmt *mgmt,
				     size_t len)
{
	u8 *pos;
	struct ieee802_11_elems elems;

	pos = mgmt->u.auth.variable;
1045
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1046
	if (!elems.challenge)
1047
		return;
1048
	ieee80211_send_auth(sdata, ifsta, 3, elems.challenge - 2,
1049 1050 1051
			    elems.challenge_len + 2, 1);
}

1052
static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1053 1054 1055 1056 1057 1058
				   struct ieee80211_if_sta *ifsta,
				   struct ieee80211_mgmt *mgmt,
				   size_t len)
{
	u16 auth_alg, auth_transaction, status_code;

1059
	if (ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
1060
	    sdata->vif.type != NL80211_IFTYPE_ADHOC)
1061 1062
		return;

1063
	if (len < 24 + 6)
1064 1065
		return;

1066
	if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1067
	    memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
1068 1069
		return;

1070
	if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1071
	    memcmp(ifsta->bssid, mgmt->bssid, ETH_ALEN) != 0)
1072 1073 1074 1075 1076 1077
		return;

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

1078
	if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1079 1080
		/*
		 * IEEE 802.11 standard does not require authentication in IBSS
1081 1082 1083
		 * networks and most implementations do not seem to use it.
		 * However, try to reply to authentication attempts if someone
		 * has actually implemented this.
1084
		 */
1085
		if (auth_alg != WLAN_AUTH_OPEN || auth_transaction != 1)
1086
			return;
1087
		ieee80211_send_auth(sdata, ifsta, 2, NULL, 0, 0);
1088 1089 1090
	}

	if (auth_alg != ifsta->auth_alg ||
1091
	    auth_transaction != ifsta->auth_transaction)
1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119
		return;

	if (status_code != WLAN_STATUS_SUCCESS) {
		if (status_code == WLAN_STATUS_NOT_SUPPORTED_AUTH_ALG) {
			u8 algs[3];
			const int num_algs = ARRAY_SIZE(algs);
			int i, pos;
			algs[0] = algs[1] = algs[2] = 0xff;
			if (ifsta->auth_algs & IEEE80211_AUTH_ALG_OPEN)
				algs[0] = WLAN_AUTH_OPEN;
			if (ifsta->auth_algs & IEEE80211_AUTH_ALG_SHARED_KEY)
				algs[1] = WLAN_AUTH_SHARED_KEY;
			if (ifsta->auth_algs & IEEE80211_AUTH_ALG_LEAP)
				algs[2] = WLAN_AUTH_LEAP;
			if (ifsta->auth_alg == WLAN_AUTH_OPEN)
				pos = 0;
			else if (ifsta->auth_alg == WLAN_AUTH_SHARED_KEY)
				pos = 1;
			else
				pos = 2;
			for (i = 0; i < num_algs; i++) {
				pos++;
				if (pos >= num_algs)
					pos = 0;
				if (algs[pos] == ifsta->auth_alg ||
				    algs[pos] == 0xff)
					continue;
				if (algs[pos] == WLAN_AUTH_SHARED_KEY &&
1120
				    !ieee80211_sta_wep_configured(sdata))
1121