mlme.c 72.2 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
				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 */
394 395 396 397 398 399
	/*
	 * 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.
	 */
400
	if (wmm && (ifsta->flags & IEEE80211_STA_WMM_ENABLED) &&
401 402
	    sband->ht_cap.ht_supported &&
	    (ht_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_INFORMATION)) &&
403 404
	    ht_ie[1] >= sizeof(struct ieee80211_ht_info) &&
	    (!(ifsta->flags & IEEE80211_STA_TKIP_WEP_USED))) {
405 406 407
		struct ieee80211_ht_info *ht_info =
			(struct ieee80211_ht_info *)(ht_ie + 2);
		u16 cap = sband->ht_cap.cap;
408 409 410
		__le16 tmp;
		u32 flags = local->hw.conf.channel->flags;

411 412
		switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
		case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
413
			if (flags & IEEE80211_CHAN_NO_FAT_ABOVE) {
414
				cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
415 416 417
				cap &= ~IEEE80211_HT_CAP_SGI_40;
			}
			break;
418
		case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
419
			if (flags & IEEE80211_CHAN_NO_FAT_BELOW) {
420
				cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
421 422 423 424 425 426 427 428 429 430 431 432 433
				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 */
434 435 436
		*pos++ = sband->ht_cap.ampdu_factor |
			 (sband->ht_cap.ampdu_density << 2);
		memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
437 438 439 440 441 442 443 444
	}

	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);

445
	ieee80211_tx_skb(sdata, skb, 0);
446 447 448
}


449 450
static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
					   u16 stype, u16 reason)
451 452
{
	struct ieee80211_local *local = sdata->local;
453
	struct ieee80211_if_sta *ifsta = &sdata->u.sta;
454 455 456 457 458
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;

	skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
	if (!skb) {
459 460
		printk(KERN_DEBUG "%s: failed to allocate buffer for "
		       "deauth/disassoc frame\n", sdata->dev->name);
461 462 463 464 465 466 467 468 469
		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);
470
	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
471
	skb_put(skb, 2);
472
	/* u.deauth.reason_code == u.disassoc.reason_code */
473 474
	mgmt->u.deauth.reason_code = cpu_to_le16(reason);

475
	ieee80211_tx_skb(sdata, skb, 0);
476 477
}

Johannes Berg's avatar
Johannes Berg committed
478
/* MLME */
479
static void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
480
					 struct ieee80211_bss *bss)
481 482 483 484 485 486 487 488 489 490 491 492 493 494 495
{
	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;

496
	ieee80211_set_wmm_default(sdata);
497 498
}

499
static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
500 501 502 503 504 505 506 507
				     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;

508 509 510 511 512 513
	if (!(ifsta->flags & IEEE80211_STA_WMM_ENABLED))
		return;

	if (!wmm_param)
		return;

514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536
	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
537
			queue = 3;
Johannes Berg's avatar
Johannes Berg committed
538
			if (acm)
539 540 541
				local->wmm_acm |= BIT(0) | BIT(3);
			break;
		case 2:
Johannes Berg's avatar
Johannes Berg committed
542
			queue = 1;
Johannes Berg's avatar
Johannes Berg committed
543
			if (acm)
544 545 546
				local->wmm_acm |= BIT(4) | BIT(5);
			break;
		case 3:
Johannes Berg's avatar
Johannes Berg committed
547
			queue = 0;
Johannes Berg's avatar
Johannes Berg committed
548
			if (acm)
549 550 551 552
				local->wmm_acm |= BIT(6) | BIT(7);
			break;
		case 0:
		default:
Johannes Berg's avatar
Johannes Berg committed
553
			queue = 2;
Johannes Berg's avatar
Johannes Berg committed
554
			if (acm)
555 556 557 558 559 560 561
				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);
562
		params.txop = get_unaligned_le16(pos + 2);
563
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
564
		printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
565
		       "cWmin=%d cWmax=%d txop=%d\n",
566
		       local->mdev->name, queue, aci, acm, params.aifs, params.cw_min,
567 568
		       params.cw_max, params.txop);
#endif
569 570 571 572
		/* 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 "
573
			       "parameters for queue %d\n", local->mdev->name, queue);
574 575 576 577
		}
	}
}

578 579
static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
					   u16 capab, bool erp_valid, u8 erp)
580
{
581
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
582
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
583
	struct ieee80211_if_sta *ifsta = &sdata->u.sta;
584
#endif
585
	u32 changed = 0;
586 587 588 589 590 591 592 593 594 595 596 597 598
	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);
599

600
	if (use_protection != bss_conf->use_cts_prot) {
601
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
602
		if (net_ratelimit()) {
603
			printk(KERN_DEBUG "%s: CTS protection %s (BSSID=%pM)\n",
604
			       sdata->dev->name,
605
			       use_protection ? "enabled" : "disabled",
606
			       ifsta->bssid);
607
		}
608
#endif
609 610
		bss_conf->use_cts_prot = use_protection;
		changed |= BSS_CHANGED_ERP_CTS_PROT;
611
	}
612

613
	if (use_short_preamble != bss_conf->use_short_preamble) {
614
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
615 616
		if (net_ratelimit()) {
			printk(KERN_DEBUG "%s: switched to %s barker preamble"
617
			       " (BSSID=%pM)\n",
618
			       sdata->dev->name,
619
			       use_short_preamble ? "short" : "long",
620
			       ifsta->bssid);
621
		}
622
#endif
623
		bss_conf->use_short_preamble = use_short_preamble;
624
		changed |= BSS_CHANGED_ERP_PREAMBLE;
625
	}
626

627 628 629
	if (use_short_slot != bss_conf->use_short_slot) {
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
		if (net_ratelimit()) {
630 631
			printk(KERN_DEBUG "%s: switched to %s slot time"
			       " (BSSID=%pM)\n",
632 633 634 635 636 637 638
			       sdata->dev->name,
			       use_short_slot ? "short" : "long",
			       ifsta->bssid);
		}
#endif
		bss_conf->use_short_slot = use_short_slot;
		changed |= BSS_CHANGED_ERP_SLOT;
639 640 641 642 643
	}

	return changed;
}

644 645 646 647 648 649 650 651 652 653 654
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);
}

655
static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata,
656 657
					 struct ieee80211_if_sta *ifsta)
{
658 659 660
	char *buf;
	size_t len;
	int i;
661 662
	union iwreq_data wrqu;

663 664 665 666 667 668 669 670 671
	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(");
672
	if (ifsta->assocreq_ies) {
673 674 675 676 677
		len += sprintf(buf + len, "ReqIEs=");
		for (i = 0; i < ifsta->assocreq_ies_len; i++) {
			len += sprintf(buf + len, "%02x",
				       ifsta->assocreq_ies[i]);
		}
678
	}
679
	if (ifsta->assocresp_ies) {
680 681 682 683 684 685 686
		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]);
		}
687
	}
688 689 690 691 692 693 694 695 696 697
	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]);
		}
	}

698 699 700 701 702
	if (len <= IW_CUSTOM_MAX) {
		memset(&wrqu, 0, sizeof(wrqu));
		wrqu.data.length = len;
		wireless_send_event(sdata->dev, IWEVCUSTOM, &wrqu, buf);
	}
703 704

	kfree(buf);
705 706 707
}


708
static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
Johannes Berg's avatar
Johannes Berg committed
709 710
				     struct ieee80211_if_sta *ifsta,
				     u32 bss_info_changed)
711
{
712
	struct ieee80211_local *local = sdata->local;
Tomas Winkler's avatar
Tomas Winkler committed
713
	struct ieee80211_conf *conf = &local_to_hw(local)->conf;
714

715
	struct ieee80211_bss *bss;
716

Johannes Berg's avatar
Johannes Berg committed
717
	bss_info_changed |= BSS_CHANGED_ASSOC;
718
	ifsta->flags |= IEEE80211_STA_ASSOCIATED;
719

720
	if (sdata->vif.type != NL80211_IFTYPE_STATION)
721
		return;
722

723 724 725 726 727
	bss = ieee80211_rx_bss_get(local, ifsta->bssid,
				   conf->channel->center_freq,
				   ifsta->ssid, ifsta->ssid_len);
	if (bss) {
		/* set timing information */
728 729 730
		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;
731

Johannes Berg's avatar
Johannes Berg committed
732
		bss_info_changed |= ieee80211_handle_bss_capability(sdata,
733
			bss->capability, bss->has_erp_value, bss->erp_value);
734 735

		ieee80211_rx_bss_put(local, bss);
736 737
	}

738 739 740
	ifsta->flags |= IEEE80211_STA_PREV_BSSID_SET;
	memcpy(ifsta->prev_bssid, sdata->u.sta.bssid, ETH_ALEN);
	ieee80211_sta_send_associnfo(sdata, ifsta);
741

742 743
	ifsta->last_probe = jiffies;
	ieee80211_led_assoc(local, 1);
744

745
	sdata->vif.bss_conf.assoc = 1;
746 747 748 749 750
	/*
	 * 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
751 752
	bss_info_changed |= BSS_CHANGED_BASIC_RATES;
	ieee80211_bss_info_change_notify(sdata, bss_info_changed);
753

754 755
	if (local->powersave &&
			!(local->hw.flags & IEEE80211_HW_NO_STACK_DYNAMIC_PS)) {
756 757 758 759 760 761 762 763
		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);
		}
764 765
	}

766 767
	netif_tx_start_all_queues(sdata->dev);
	netif_carrier_on(sdata->dev);
768

769
	ieee80211_sta_send_apinfo(sdata, ifsta);
770 771
}

772 773
static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata,
				   struct ieee80211_if_sta *ifsta)
774
{
775 776
	ifsta->direct_probe_tries++;
	if (ifsta->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
777 778
		printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
		       sdata->dev->name, ifsta->bssid);
779
		ifsta->state = IEEE80211_STA_MLME_DISABLED;
780
		ieee80211_sta_send_apinfo(sdata, ifsta);
781 782 783
		return;
	}

784 785
	printk(KERN_DEBUG "%s: direct probe to AP %pM try %d\n",
			sdata->dev->name, ifsta->bssid,
786
			ifsta->direct_probe_tries);
787

788
	ifsta->state = IEEE80211_STA_MLME_DIRECT_PROBE;
789

790 791 792 793 794 795 796 797 798
	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
799
}
800

801 802 803

static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata,
				   struct ieee80211_if_sta *ifsta)
804
{
805 806
	ifsta->auth_tries++;
	if (ifsta->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
807
		printk(KERN_DEBUG "%s: authentication with AP %pM"
808
		       " timed out\n",
809
		       sdata->dev->name, ifsta->bssid);
810
		ifsta->state = IEEE80211_STA_MLME_DISABLED;
811
		ieee80211_sta_send_apinfo(sdata, ifsta);
812 813 814
		return;
	}

815
	ifsta->state = IEEE80211_STA_MLME_AUTHENTICATE;
816 817
	printk(KERN_DEBUG "%s: authenticate with AP %pM\n",
	       sdata->dev->name, ifsta->bssid);
818

819 820 821
	ieee80211_send_auth(sdata, ifsta, 1, NULL, 0, 0);

	mod_timer(&ifsta->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
822 823
}

824 825 826 827
/*
 * The disassoc 'reason' argument can be either our own reason
 * if self disconnected or a reason code from the AP.
 */
828 829 830 831 832 833
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;
834
	u32 changed = 0, config_changed = 0;
835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850

	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;

851
	netif_tx_stop_all_queues(sdata->dev);
852 853
	netif_carrier_off(sdata->dev);

854
	ieee80211_sta_tear_down_BA_sessions(sdata, sta->sta.addr);
855 856 857

	if (self_disconnected) {
		if (deauth)
858 859
			ieee80211_send_deauth_disassoc(sdata,
				IEEE80211_STYPE_DEAUTH, reason);
860
		else
861 862
			ieee80211_send_deauth_disassoc(sdata,
				IEEE80211_STYPE_DISASSOC, reason);
863 864
	}

865 866 867 868
	ifsta->flags &= ~IEEE80211_STA_ASSOCIATED;
	changed |= ieee80211_reset_erp_info(sdata);

	ieee80211_led_assoc(local, 0);
Johannes Berg's avatar
Johannes Berg committed
869 870
	changed |= BSS_CHANGED_ASSOC;
	sdata->vif.bss_conf.assoc = false;
871 872

	ieee80211_sta_send_apinfo(sdata, ifsta);
873

874
	if (self_disconnected || reason == WLAN_REASON_DISASSOC_STA_HAS_LEFT)
875 876 877 878
		ifsta->state = IEEE80211_STA_MLME_DISABLED;

	rcu_read_unlock();

Johannes Berg's avatar
Johannes Berg committed
879
	local->hw.conf.ht.enabled = false;
Sujith's avatar
Sujith committed
880
	local->oper_channel_type = NL80211_CHAN_NO_HT;
881 882
	config_changed |= IEEE80211_CONF_CHANGE_HT;

883 884 885
	del_timer_sync(&local->dynamic_ps_timer);
	cancel_work_sync(&local->dynamic_ps_enable_work);

886 887 888 889
	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
890

891
	ieee80211_hw_config(local, config_changed);
Johannes Berg's avatar
Johannes Berg committed
892
	ieee80211_bss_info_change_notify(sdata, changed);
893 894 895 896 897 898 899 900 901 902 903 904 905 906

	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);
907
}
908

909 910 911 912 913 914 915 916
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;
}

917
static int ieee80211_privacy_mismatch(struct ieee80211_sub_if_data *sdata,
918 919
				      struct ieee80211_if_sta *ifsta)
{
920
	struct ieee80211_local *local = sdata->local;
921
	struct ieee80211_bss *bss;
922 923 924
	int bss_privacy;
	int wep_privacy;
	int privacy_invoked;
925

926
	if (!ifsta || (ifsta->flags & IEEE80211_STA_MIXED_CELL))
927 928
		return 0;

929
	bss = ieee80211_rx_bss_get(local, ifsta->bssid,
930
				   local->hw.conf.channel->center_freq,
931
				   ifsta->ssid, ifsta->ssid_len);
932 933 934
	if (!bss)
		return 0;

935
	bss_privacy = !!(bss->capability & WLAN_CAPABILITY_PRIVACY);
936
	wep_privacy = !!ieee80211_sta_wep_configured(sdata);
937
	privacy_invoked = !!(ifsta->flags & IEEE80211_STA_PRIVACY_INVOKED);
938

939
	ieee80211_rx_bss_put(local, bss);
940

941 942 943 944
	if ((bss_privacy == wep_privacy) || (bss_privacy == privacy_invoked))
		return 0;

	return 1;
945 946
}

947
static void ieee80211_associate(struct ieee80211_sub_if_data *sdata,
948 949 950 951
				struct ieee80211_if_sta *ifsta)
{
	ifsta->assoc_tries++;
	if (ifsta->assoc_tries > IEEE80211_ASSOC_MAX_TRIES) {
952
		printk(KERN_DEBUG "%s: association with AP %pM"
953
		       " timed out\n",
954
		       sdata->dev->name, ifsta->bssid);
955
		ifsta->state = IEEE80211_STA_MLME_DISABLED;
956
		ieee80211_sta_send_apinfo(sdata, ifsta);
957 958 959
		return;
	}

960
	ifsta->state = IEEE80211_STA_MLME_ASSOCIATE;
961 962
	printk(KERN_DEBUG "%s: associate with AP %pM\n",
	       sdata->dev->name, ifsta->bssid);
963
	if (ieee80211_privacy_mismatch(sdata, ifsta)) {
964
		printk(KERN_DEBUG "%s: mismatch in privacy configuration and "
965
		       "mixed-cell disabled - abort association\n", sdata->dev->name);
966
		ifsta->state = IEEE80211_STA_MLME_DISABLED;
967 968 969
		return;
	}

970
	ieee80211_send_assoc(sdata, ifsta);
971 972 973 974 975

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


976
static void ieee80211_associated(struct ieee80211_sub_if_data *sdata,
977 978
				 struct ieee80211_if_sta *ifsta)
{
979
	struct ieee80211_local *local = sdata->local;
980 981 982 983 984 985 986 987
	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 */

988
	ifsta->state = IEEE80211_STA_MLME_ASSOCIATED;
989

990 991
	rcu_read_lock();

992 993
	sta = sta_info_get(local, ifsta->bssid);
	if (!sta) {
994 995
		printk(KERN_DEBUG "%s: No STA entry for own AP %pM\n",
		       sdata->dev->name, ifsta->bssid);
996 997 998 999 1000
		disassoc = 1;
	} else {
		disassoc = 0;
		if (time_after(jiffies,
			       sta->last_rx + IEEE80211_MONITORING_INTERVAL)) {
1001
			if (ifsta->flags & IEEE80211_STA_PROBEREQ_POLL) {
1002
				printk(KERN_DEBUG "%s: No ProbeResp from "
1003
				       "current AP %pM - assume out of "
1004
				       "range\n",
1005
				       sdata->dev->name, ifsta->bssid);
1006
				disassoc = 1;
1007
			} else
1008
				ieee80211_send_probe_req(sdata, ifsta->bssid,
1009 1010
							 ifsta->ssid,
							 ifsta->ssid_len);
1011
			ifsta->flags ^= IEEE80211_STA_PROBEREQ_POLL;
1012
		} else {
1013
			ifsta->flags &= ~IEEE80211_STA_PROBEREQ_POLL;
1014 1015 1016
			if (time_after(jiffies, ifsta->last_probe +
				       IEEE80211_PROBE_INTERVAL)) {
				ifsta->last_probe = jiffies;
1017
				ieee80211_send_probe_req(sdata, ifsta->bssid,
1018 1019 1020 1021 1022
							 ifsta->ssid,
							 ifsta->ssid_len);
			}
		}
	}
1023 1024 1025

	rcu_read_unlock();

Johannes Berg's avatar
Johannes Berg committed
1026 1027 1028 1029 1030 1031
	if (disassoc)
		ieee80211_set_disassoc(sdata, ifsta, true, true,
					WLAN_REASON_PREV_AUTH_NOT_VALID);
	else
		mod_timer(&ifsta->timer, jiffies +
				      IEEE80211_MONITORING_INTERVAL);
1032 1033 1034
}


1035
static void ieee80211_auth_completed(struct ieee80211_sub_if_data *sdata,
1036 1037
				     struct ieee80211_if_sta *ifsta)
{
1038
	printk(KERN_DEBUG "%s: authenticated\n", sdata->dev->name);
1039
	ifsta->flags |= IEEE80211_STA_AUTHENTICATED;
1040
	ieee80211_associate(sdata, ifsta);
1041 1042 1043
}


1044
static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
1045 1046 1047 1048 1049 1050 1051 1052
				     struct ieee80211_if_sta *ifsta,
				     struct ieee80211_mgmt *mgmt,
				     size_t len)
{
	u8 *pos;
	struct ieee802_11_elems elems;

	pos = mgmt->u.auth.variable;
1053
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1054
	if (!elems.challenge)
1055
		return;
1056
	ieee80211_send_auth(sdata, ifsta, 3, elems.challenge - 2,
1057 1058 1059
			    elems.challenge_len + 2, 1);
}

1060
static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
1061 1062 1063 1064 1065 1066
				   struct ieee80211_if_sta *ifsta,
				   struct ieee80211_mgmt *mgmt,
				   size_t len)
{
	u16 auth_alg, auth_transaction, status_code;

1067
	if (ifsta->state != IEEE80211_STA_MLME_AUTHENTICATE &&
1068
	    sdata->vif.type != NL80211_IFTYPE_ADHOC)
1069 1070
		return;

1071
	if (len < 24 + 6)
1072 1073
		return;

1074
	if (sdata->vif.type != NL80211_IFTYPE_ADHOC &&
1075
	    memcmp(ifsta->bssid, mgmt->sa, ETH_ALEN) != 0)
Jiri Benc's avatar