mlme.c 65.3 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
#include <linux/if_ether.h>
#include <linux/skbuff.h>
#include <linux/if_arp.h>
#include <linux/etherdevice.h>
19
#include <linux/rtnetlink.h>
20
#include <linux/pm_qos_params.h>
21
#include <linux/crc32.h>
22
#include <net/mac80211.h>
23
#include <asm/unaligned.h>
Johannes Berg's avatar
Johannes Berg committed
24

25
#include "ieee80211_i.h"
Johannes Berg's avatar
Johannes Berg committed
26 27
#include "rate.h"
#include "led.h"
28

29
#define IEEE80211_ASSOC_SCANS_MAX_TRIES 2
30 31 32 33 34
#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)
35
#define IEEE80211_PROBE_IDLE_TIME (60 * HZ)
36 37
#define IEEE80211_RETRY_AUTH_INTERVAL (1 * HZ)

38 39
/* utils */
static int ecw2cw(int ecw)
Johannes Berg's avatar
Johannes Berg committed
40
{
41
	return (1 << ecw) - 1;
Johannes Berg's avatar
Johannes Berg committed
42 43
}

44
static u8 *ieee80211_bss_get_ie(struct ieee80211_bss *bss, u8 ie)
45 46 47
{
	u8 *end, *pos;

48
	pos = bss->cbss.information_elements;
49 50
	if (pos == NULL)
		return NULL;
51
	end = pos + bss->cbss.len_information_elements;
52 53 54 55 56 57 58 59 60 61 62 63

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

	return NULL;
}

64
static int ieee80211_compatible_rates(struct ieee80211_bss *bss,
65
				      struct ieee80211_supported_band *sband,
66
				      u32 *rates)
67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84
{
	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;
}

85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167
/*
 * ieee80211_enable_ht should be called only after the operating band
 * has been determined as ht configuration depends on the hw's
 * HT abilities for a specific band.
 */
static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
			       struct ieee80211_ht_info *hti,
			       u16 ap_ht_cap_flags)
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_supported_band *sband;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	struct ieee80211_bss_ht_conf ht;
	struct sta_info *sta;
	u32 changed = 0;
	bool enable_ht = true, ht_changed;
	enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;

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

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

	/* HT is not supported */
	if (!sband->ht_cap.ht_supported)
		enable_ht = false;

	/* check that channel matches the right operating channel */
	if (local->hw.conf.channel->center_freq !=
	    ieee80211_channel_to_frequency(hti->control_chan))
		enable_ht = false;

	if (enable_ht) {
		channel_type = NL80211_CHAN_HT20;

		if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
		    (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
		    (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
			switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
			case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
				channel_type = NL80211_CHAN_HT40PLUS;
				break;
			case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
				channel_type = NL80211_CHAN_HT40MINUS;
				break;
			}
		}
	}

	ht_changed = conf_is_ht(&local->hw.conf) != enable_ht ||
		     channel_type != local->hw.conf.channel_type;

	local->oper_channel_type = channel_type;

	if (ht_changed) {
                /* channel_type change automatically detected */
		ieee80211_hw_config(local, 0);

		rcu_read_lock();

		sta = sta_info_get(local, ifmgd->bssid);
		if (sta)
			rate_control_rate_update(local, sband, sta,
						 IEEE80211_RC_HT_CHANGED);

		rcu_read_unlock();

        }

	/* disable HT */
	if (!enable_ht)
		return 0;

	ht.operation_mode = le16_to_cpu(hti->operation_mode);

	/* if bss configuration changed store the new one */
	if (memcmp(&sdata->vif.bss_conf.ht, &ht, sizeof(ht))) {
		changed |= BSS_CHANGED_HT;
		sdata->vif.bss_conf.ht = ht;
	}

	return changed;
}

168 169
/* frame sending functions */

170
static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
171
{
172
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
173 174 175
	struct ieee80211_local *local = sdata->local;
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;
176
	u8 *pos, *ies, *ht_ie;
177 178
	int i, len, count, rates_len, supp_rates_len;
	u16 capab;
179
	struct ieee80211_bss *bss;
180 181
	int wmm = 0;
	struct ieee80211_supported_band *sband;
182
	u32 rates = 0;
183 184

	skb = dev_alloc_skb(local->hw.extra_tx_headroom +
185
			    sizeof(*mgmt) + 200 + ifmgd->extra_ie_len +
186
			    ifmgd->ssid_len);
187 188 189 190 191 192 193 194 195
	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];

196
	capab = ifmgd->capab;
197 198 199 200 201 202 203 204

	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;
	}

205
	bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
206
				   local->hw.conf.channel->center_freq,
207
				   ifmgd->ssid, ifmgd->ssid_len);
208
	if (bss) {
209
		if (bss->cbss.capability & WLAN_CAPABILITY_PRIVACY)
210 211 212 213 214 215 216 217 218 219
			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);

220
		if ((bss->cbss.capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
221 222 223 224 225 226 227 228 229 230 231
		    (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);
232
	memcpy(mgmt->da, ifmgd->bssid, ETH_ALEN);
233
	memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
234
	memcpy(mgmt->bssid, ifmgd->bssid, ETH_ALEN);
235

236
	if (ifmgd->flags & IEEE80211_STA_PREV_BSSID_SET) {
237 238 239 240 241 242
		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);
243
		memcpy(mgmt->u.reassoc_req.current_ap, ifmgd->prev_bssid,
244 245 246 247 248 249
		       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);
250
		mgmt->u.assoc_req.listen_interval =
251 252 253 254
				cpu_to_le16(local->hw.conf.listen_interval);
	}

	/* SSID */
255
	ies = pos = skb_put(skb, 2 + ifmgd->ssid_len);
256
	*pos++ = WLAN_EID_SSID;
257 258
	*pos++ = ifmgd->ssid_len;
	memcpy(pos, ifmgd->ssid, ifmgd->ssid_len);
259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312

	/* 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*/
		}
	}

313 314 315
	if (ifmgd->extra_ie) {
		pos = skb_put(skb, ifmgd->extra_ie_len);
		memcpy(pos, ifmgd->extra_ie, ifmgd->extra_ie_len);
316 317
	}

318
	if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED)) {
319 320 321 322 323 324 325 326 327 328 329 330 331
		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 */
332 333 334 335 336 337
	/*
	 * 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.
	 */
338
	if (wmm && (ifmgd->flags & IEEE80211_STA_WMM_ENABLED) &&
339 340
	    sband->ht_cap.ht_supported &&
	    (ht_ie = ieee80211_bss_get_ie(bss, WLAN_EID_HT_INFORMATION)) &&
341
	    ht_ie[1] >= sizeof(struct ieee80211_ht_info) &&
342
	    (!(ifmgd->flags & IEEE80211_STA_TKIP_WEP_USED))) {
343 344 345
		struct ieee80211_ht_info *ht_info =
			(struct ieee80211_ht_info *)(ht_ie + 2);
		u16 cap = sband->ht_cap.cap;
346 347 348
		__le16 tmp;
		u32 flags = local->hw.conf.channel->flags;

349 350
		switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
		case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
351
			if (flags & IEEE80211_CHAN_NO_FAT_ABOVE) {
352
				cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
353 354 355
				cap &= ~IEEE80211_HT_CAP_SGI_40;
			}
			break;
356
		case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
357
			if (flags & IEEE80211_CHAN_NO_FAT_BELOW) {
358
				cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
359 360 361 362 363 364 365 366 367 368 369 370 371
				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 */
372 373 374
		*pos++ = sband->ht_cap.ampdu_factor |
			 (sband->ht_cap.ampdu_density << 2);
		memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
375 376
	}

377 378 379 380 381
	kfree(ifmgd->assocreq_ies);
	ifmgd->assocreq_ies_len = (skb->data + skb->len) - ies;
	ifmgd->assocreq_ies = kmalloc(ifmgd->assocreq_ies_len, GFP_KERNEL);
	if (ifmgd->assocreq_ies)
		memcpy(ifmgd->assocreq_ies, ies, ifmgd->assocreq_ies_len);
382

383
	ieee80211_tx_skb(sdata, skb, 0);
384 385 386
}


387 388
static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
					   u16 stype, u16 reason)
389 390
{
	struct ieee80211_local *local = sdata->local;
391
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
392 393
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;
394

395
	skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
396
	if (!skb) {
397 398
		printk(KERN_DEBUG "%s: failed to allocate buffer for "
		       "deauth/disassoc frame\n", sdata->dev->name);
399 400 401 402 403 404
		return;
	}
	skb_reserve(skb, local->hw.extra_tx_headroom);

	mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
	memset(mgmt, 0, 24);
405
	memcpy(mgmt->da, ifmgd->bssid, ETH_ALEN);
406
	memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
407
	memcpy(mgmt->bssid, ifmgd->bssid, ETH_ALEN);
408
	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
409
	skb_put(skb, 2);
410
	/* u.deauth.reason_code == u.disassoc.reason_code */
411 412
	mgmt->u.deauth.reason_code = cpu_to_le16(reason);

413 414 415 416
	if (stype == IEEE80211_STYPE_DEAUTH)
		cfg80211_send_deauth(sdata->dev, (u8 *) mgmt, skb->len);
	else
		cfg80211_send_disassoc(sdata->dev, (u8 *) mgmt, skb->len);
417
	ieee80211_tx_skb(sdata, skb, ifmgd->flags & IEEE80211_STA_MFP_ENABLED);
418 419
}

420 421 422
void ieee80211_send_pspoll(struct ieee80211_local *local,
			   struct ieee80211_sub_if_data *sdata)
{
423
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439
	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);
440
	pspoll->aid = cpu_to_le16(ifmgd->aid);
441 442 443 444

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

445
	memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
446 447 448 449 450
	memcpy(pspoll->ta, sdata->dev->dev_addr, ETH_ALEN);

	ieee80211_tx_skb(sdata, skb, 0);
}

451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489
void ieee80211_send_nullfunc(struct ieee80211_local *local,
			     struct ieee80211_sub_if_data *sdata,
			     int powersave)
{
	struct sk_buff *skb;
	struct ieee80211_hdr *nullfunc;
	__le16 fc;

	if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
		return;

	skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
	if (!skb) {
		printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
		       "frame\n", sdata->dev->name);
		return;
	}
	skb_reserve(skb, local->hw.extra_tx_headroom);

	nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
	memset(nullfunc, 0, 24);
	fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
			 IEEE80211_FCTL_TODS);
	if (powersave)
		fc |= cpu_to_le16(IEEE80211_FCTL_PM);
	nullfunc->frame_control = fc;
	memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
	memcpy(nullfunc->addr2, sdata->dev->dev_addr, ETH_ALEN);
	memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);

	ieee80211_tx_skb(sdata, skb, 0);
}

/* powersave */
static void ieee80211_enable_ps(struct ieee80211_local *local,
				struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_conf *conf = &local->hw.conf;

Johannes Berg's avatar
Johannes Berg committed
490 491 492 493 494 495 496
	/*
	 * If we are scanning right now then the parameters will
	 * take effect when scan finishes.
	 */
	if (local->hw_scanning || local->sw_scanning)
		return;

497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526
	if (conf->dynamic_ps_timeout > 0 &&
	    !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
		mod_timer(&local->dynamic_ps_timer, jiffies +
			  msecs_to_jiffies(conf->dynamic_ps_timeout));
	} else {
		if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
			ieee80211_send_nullfunc(local, sdata, 1);
		conf->flags |= IEEE80211_CONF_PS;
		ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
	}
}

static void ieee80211_change_ps(struct ieee80211_local *local)
{
	struct ieee80211_conf *conf = &local->hw.conf;

	if (local->ps_sdata) {
		if (!(local->ps_sdata->u.mgd.flags & IEEE80211_STA_ASSOCIATED))
			return;

		ieee80211_enable_ps(local, local->ps_sdata);
	} else if (conf->flags & IEEE80211_CONF_PS) {
		conf->flags &= ~IEEE80211_CONF_PS;
		ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
		del_timer_sync(&local->dynamic_ps_timer);
		cancel_work_sync(&local->dynamic_ps_enable_work);
	}
}

/* need to hold RTNL or interface lock */
527
void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545
{
	struct ieee80211_sub_if_data *sdata, *found = NULL;
	int count = 0;

	if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
		local->ps_sdata = NULL;
		return;
	}

	list_for_each_entry(sdata, &local->interfaces, list) {
		if (!netif_running(sdata->dev))
			continue;
		if (sdata->vif.type != NL80211_IFTYPE_STATION)
			continue;
		found = sdata;
		count++;
	}

546 547 548 549 550 551 552 553 554
	if (count == 1 && found->u.mgd.powersave) {
		s32 beaconint_us;

		if (latency < 0)
			latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY);

		beaconint_us = ieee80211_tu_to_usec(
					found->vif.bss_conf.beacon_int);

555
		if (beaconint_us > latency) {
556
			local->ps_sdata = NULL;
557 558 559 560 561 562 563 564
		} else {
			u8 dtimper = found->vif.bss_conf.dtim_period;
			int maxslp = 1;

			if (dtimper > 1)
				maxslp = min_t(int, dtimper,
						    latency / beaconint_us);

565
			local->hw.conf.max_sleep_period = maxslp;
566
			local->ps_sdata = found;
567
		}
568
	} else {
569
		local->ps_sdata = NULL;
570
	}
571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617

	ieee80211_change_ps(local);
}

void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
{
	struct ieee80211_local *local =
		container_of(work, struct ieee80211_local,
			     dynamic_ps_disable_work);

	if (local->hw.conf.flags & IEEE80211_CONF_PS) {
		local->hw.conf.flags &= ~IEEE80211_CONF_PS;
		ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
	}

	ieee80211_wake_queues_by_reason(&local->hw,
					IEEE80211_QUEUE_STOP_REASON_PS);
}

void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
{
	struct ieee80211_local *local =
		container_of(work, struct ieee80211_local,
			     dynamic_ps_enable_work);
	struct ieee80211_sub_if_data *sdata = local->ps_sdata;

	/* can only happen when PS was just disabled anyway */
	if (!sdata)
		return;

	if (local->hw.conf.flags & IEEE80211_CONF_PS)
		return;

	if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
		ieee80211_send_nullfunc(local, sdata, 1);

	local->hw.conf.flags |= IEEE80211_CONF_PS;
	ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
}

void ieee80211_dynamic_ps_timer(unsigned long data)
{
	struct ieee80211_local *local = (void *) data;

	queue_work(local->hw.workqueue, &local->dynamic_ps_enable_work);
}

Johannes Berg's avatar
Johannes Berg committed
618
/* MLME */
619
static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
620
				     struct ieee80211_if_managed *ifmgd,
621 622 623 624 625 626 627
				     u8 *wmm_param, size_t wmm_param_len)
{
	struct ieee80211_tx_queue_params params;
	size_t left;
	int count;
	u8 *pos;

628
	if (!(ifmgd->flags & IEEE80211_STA_WMM_ENABLED))
629 630 631 632 633
		return;

	if (!wmm_param)
		return;

634 635 636
	if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
		return;
	count = wmm_param[6] & 0x0f;
637
	if (count == ifmgd->wmm_last_param_set)
638
		return;
639
	ifmgd->wmm_last_param_set = count;
640 641 642 643 644 645 646 647 648 649 650 651 652

	pos = wmm_param + 8;
	left = wmm_param_len - 8;

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

	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) {
653
		case 1: /* AC_BK */
Johannes Berg's avatar
Johannes Berg committed
654
			queue = 3;
Johannes Berg's avatar
Johannes Berg committed
655
			if (acm)
656
				local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
657
			break;
658
		case 2: /* AC_VI */
Johannes Berg's avatar
Johannes Berg committed
659
			queue = 1;
Johannes Berg's avatar
Johannes Berg committed
660
			if (acm)
661
				local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
662
			break;
663
		case 3: /* AC_VO */
Johannes Berg's avatar
Johannes Berg committed
664
			queue = 0;
Johannes Berg's avatar
Johannes Berg committed
665
			if (acm)
666
				local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
667
			break;
668
		case 0: /* AC_BE */
669
		default:
Johannes Berg's avatar
Johannes Berg committed
670
			queue = 2;
Johannes Berg's avatar
Johannes Berg committed
671
			if (acm)
672
				local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
673 674 675 676 677 678
			break;
		}

		params.aifs = pos[0] & 0x0f;
		params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
		params.cw_min = ecw2cw(pos[1] & 0x0f);
679
		params.txop = get_unaligned_le16(pos + 2);
680
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
681
		printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
682
		       "cWmin=%d cWmax=%d txop=%d\n",
683
		       local->mdev->name, queue, aci, acm, params.aifs, params.cw_min,
684 685
		       params.cw_max, params.txop);
#endif
686 687
		if (local->ops->conf_tx &&
		    local->ops->conf_tx(local_to_hw(local), queue, &params)) {
688
			printk(KERN_DEBUG "%s: failed to set TX queue "
689
			       "parameters for queue %d\n", local->mdev->name, queue);
690 691 692 693
		}
	}
}

694 695
static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
					   u16 capab, bool erp_valid, u8 erp)
696
{
697
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
698
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
699
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
700
#endif
701
	u32 changed = 0;
702 703 704 705 706 707 708 709 710 711 712 713 714
	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);
715

716
	if (use_protection != bss_conf->use_cts_prot) {
717
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
718
		if (net_ratelimit()) {
719
			printk(KERN_DEBUG "%s: CTS protection %s (BSSID=%pM)\n",
720
			       sdata->dev->name,
721
			       use_protection ? "enabled" : "disabled",
722
			       ifmgd->bssid);
723
		}
724
#endif
725 726
		bss_conf->use_cts_prot = use_protection;
		changed |= BSS_CHANGED_ERP_CTS_PROT;
727
	}
728

729
	if (use_short_preamble != bss_conf->use_short_preamble) {
730
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
731 732
		if (net_ratelimit()) {
			printk(KERN_DEBUG "%s: switched to %s barker preamble"
733
			       " (BSSID=%pM)\n",
734
			       sdata->dev->name,
735
			       use_short_preamble ? "short" : "long",
736
			       ifmgd->bssid);
737
		}
738
#endif
739
		bss_conf->use_short_preamble = use_short_preamble;
740
		changed |= BSS_CHANGED_ERP_PREAMBLE;
741
	}
742

743 744 745
	if (use_short_slot != bss_conf->use_short_slot) {
#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
		if (net_ratelimit()) {
746 747
			printk(KERN_DEBUG "%s: switched to %s slot time"
			       " (BSSID=%pM)\n",
748 749
			       sdata->dev->name,
			       use_short_slot ? "short" : "long",
750
			       ifmgd->bssid);
751 752 753 754
		}
#endif
		bss_conf->use_short_slot = use_short_slot;
		changed |= BSS_CHANGED_ERP_SLOT;
755 756 757 758 759
	}

	return changed;
}

760
static void ieee80211_sta_send_apinfo(struct ieee80211_sub_if_data *sdata)
761 762
{
	union iwreq_data wrqu;
763

764
	memset(&wrqu, 0, sizeof(wrqu));
765 766
	if (sdata->u.mgd.flags & IEEE80211_STA_ASSOCIATED)
		memcpy(wrqu.ap_addr.sa_data, sdata->u.mgd.bssid, ETH_ALEN);
767 768 769 770
	wrqu.ap_addr.sa_family = ARPHRD_ETHER;
	wireless_send_event(sdata->dev, SIOCGIWAP, &wrqu, NULL);
}

771
static void ieee80211_sta_send_associnfo(struct ieee80211_sub_if_data *sdata)
772
{
773
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
774 775 776
	char *buf;
	size_t len;
	int i;
777 778
	union iwreq_data wrqu;

779
	if (!ifmgd->assocreq_ies && !ifmgd->assocresp_ies)
780 781
		return;

782 783
	buf = kmalloc(50 + 2 * (ifmgd->assocreq_ies_len +
				ifmgd->assocresp_ies_len), GFP_KERNEL);
784 785 786 787
	if (!buf)
		return;

	len = sprintf(buf, "ASSOCINFO(");
788
	if (ifmgd->assocreq_ies) {
789
		len += sprintf(buf + len, "ReqIEs=");
790
		for (i = 0; i < ifmgd->assocreq_ies_len; i++) {
791
			len += sprintf(buf + len, "%02x",
792
				       ifmgd->assocreq_ies[i]);
793
		}
794
	}
795 796
	if (ifmgd->assocresp_ies) {
		if (ifmgd->assocreq_ies)
797 798
			len += sprintf(buf + len, " ");
		len += sprintf(buf + len, "RespIEs=");
799
		for (i = 0; i < ifmgd->assocresp_ies_len; i++) {
800
			len += sprintf(buf + len, "%02x",
801
				       ifmgd->assocresp_ies[i]);
802
		}
803
	}
804 805 806 807
	len += sprintf(buf + len, ")");

	if (len > IW_CUSTOM_MAX) {
		len = sprintf(buf, "ASSOCRESPIE=");
808
		for (i = 0; i < ifmgd->assocresp_ies_len; i++) {
809
			len += sprintf(buf + len, "%02x",
810
				       ifmgd->assocresp_ies[i]);
811 812 813
		}
	}

814 815 816 817 818
	if (len <= IW_CUSTOM_MAX) {
		memset(&wrqu, 0, sizeof(wrqu));
		wrqu.data.length = len;
		wireless_send_event(sdata->dev, IWEVCUSTOM, &wrqu, buf);
	}
819 820

	kfree(buf);
821 822 823
}


824
static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
Johannes Berg's avatar
Johannes Berg committed
825
				     u32 bss_info_changed)
826
{
827
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
828
	struct ieee80211_local *local = sdata->local;
Tomas Winkler's avatar
Tomas Winkler committed
829
	struct ieee80211_conf *conf = &local_to_hw(local)->conf;
830

831
	struct ieee80211_bss *bss;
832

Johannes Berg's avatar
Johannes Berg committed
833
	bss_info_changed |= BSS_CHANGED_ASSOC;
834
	ifmgd->flags |= IEEE80211_STA_ASSOCIATED;
835

836
	bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
837
				   conf->channel->center_freq,
838
				   ifmgd->ssid, ifmgd->ssid_len);
839 840
	if (bss) {
		/* set timing information */
841 842
		sdata->vif.bss_conf.beacon_int = bss->cbss.beacon_interval;
		sdata->vif.bss_conf.timestamp = bss->cbss.tsf;
843
		sdata->vif.bss_conf.dtim_period = bss->dtim_period;
844

845
		bss_info_changed |= BSS_CHANGED_BEACON_INT;
Johannes Berg's avatar
Johannes Berg committed
846
		bss_info_changed |= ieee80211_handle_bss_capability(sdata,
847
			bss->cbss.capability, bss->has_erp_value, bss->erp_value);
848

849 850
		cfg80211_hold_bss(&bss->cbss);

851
		ieee80211_rx_bss_put(local, bss);
852 853
	}

854 855 856
	ifmgd->flags |= IEEE80211_STA_PREV_BSSID_SET;
	memcpy(ifmgd->prev_bssid, sdata->u.mgd.bssid, ETH_ALEN);
	ieee80211_sta_send_associnfo(sdata);
857

858
	ifmgd->last_probe = jiffies;
859
	ieee80211_led_assoc(local, 1);
860

861
	sdata->vif.bss_conf.assoc = 1;
862 863 864 865 866
	/*
	 * 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
867 868
	bss_info_changed |= BSS_CHANGED_BASIC_RATES;
	ieee80211_bss_info_change_notify(sdata, bss_info_changed);
869

870
	/* will be same as sdata */
871 872 873 874 875
	if (local->ps_sdata) {
		mutex_lock(&local->iflist_mtx);
		ieee80211_recalc_ps(local, -1);
		mutex_unlock(&local->iflist_mtx);
	}
876

877 878
	netif_tx_start_all_queues(sdata->dev);
	netif_carrier_on(sdata->dev);
879

880
	ieee80211_sta_send_apinfo(sdata);
881 882
}

883
static void ieee80211_direct_probe(struct ieee80211_sub_if_data *sdata)
884
{
885
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
886
	struct ieee80211_local *local = sdata->local;
887 888 889

	ifmgd->direct_probe_tries++;
	if (ifmgd->direct_probe_tries > IEEE80211_AUTH_MAX_TRIES) {
890
		printk(KERN_DEBUG "%s: direct probe to AP %pM timed out\n",
891 892 893
		       sdata->dev->name, ifmgd->bssid);
		ifmgd->state = IEEE80211_STA_MLME_DISABLED;
		ieee80211_sta_send_apinfo(sdata);
894 895 896 897 898

		/*
		 * Most likely AP is not in the range so remove the
		 * bss information associated to the AP
		 */
899
		ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
900
				sdata->local->hw.conf.channel->center_freq,
901
				ifmgd->ssid, ifmgd->ssid_len);
902 903 904 905 906 907 908

		/*
		 * We might have a pending scan which had no chance to run yet
		 * due to state == IEEE80211_STA_MLME_DIRECT_PROBE.
		 * Hence, queue the STAs work again
		 */
		queue_work(local->hw.workqueue, &ifmgd->work);
909 910 911
		return;
	}

912
	printk(KERN_DEBUG "%s: direct probe to AP %pM try %d\n",
913 914
			sdata->dev->name, ifmgd->bssid,
			ifmgd->direct_probe_tries);
915

916
	ifmgd->state = IEEE80211_STA_MLME_DIRECT_PROBE;
917

918
	set_bit(IEEE80211_STA_REQ_DIRECT_PROBE, &ifmgd->request);
919 920 921 922 923

	/* 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,
924
				 ifmgd->ssid, ifmgd->ssid_len, NULL, 0);
925

926
	mod_timer(&ifmgd->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
Johannes Berg's avatar
Johannes Berg committed
927
}
928

929

930
static void ieee80211_authenticate(struct ieee80211_sub_if_data *sdata)
931
{
932
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
933
	struct ieee80211_local *local = sdata->local;
934 935
	u8 *ies;
	size_t ies_len;
936 937 938

	ifmgd->auth_tries++;
	if (ifmgd->auth_tries > IEEE80211_AUTH_MAX_TRIES) {
939
		printk(KERN_DEBUG "%s: authentication with AP %pM"
940
		       " timed out\n",
941 942
		       sdata->dev->name, ifmgd->bssid);
		ifmgd->state = IEEE80211_STA_MLME_DISABLED;
943
		cfg80211_send_auth_timeout(sdata->dev, ifmgd->bssid);
944
		ieee80211_rx_bss_remove(sdata, ifmgd->bssid,
945
				sdata->local->hw.conf.channel->center_freq,
946
				ifmgd->ssid, ifmgd->ssid_len);
947 948 949 950 951 952 953

		/*
		 * We might have a pending scan which had no chance to run yet
		 * due to state == IEEE80211_STA_MLME_AUTHENTICATE.
		 * Hence, queue the STAs work again
		 */
		queue_work(local->hw.workqueue, &ifmgd->work);
954 955 956
		return;
	}

957
	ifmgd->state = IEEE80211_STA_MLME_AUTHENTICATE;
958
	printk(KERN_DEBUG "%s: authenticate with AP %pM\n",
959
	       sdata->dev->name, ifmgd->bssid);
960

961 962 963 964 965 966 967 968
	if (ifmgd->flags & IEEE80211_STA_EXT_SME) {
		ies = ifmgd->sme_auth_ie;
		ies_len = ifmgd->sme_auth_ie_len;
	} else {
		ies = NULL;
		ies_len = 0;
	}
	ieee80211_send_auth(sdata, 1, ifmgd->auth_alg, ies, ies_len,
969 970
			    ifmgd->bssid, 0);
	ifmgd->auth_transaction = 2;
971

972
	mod_timer(&ifmgd->timer, jiffies + IEEE80211_AUTH_TIMEOUT);
973 974
}

975 976 977 978
/*
 * The disassoc 'reason' argument can be either our own reason
 * if self disconnected or a reason code from the AP.
 */
979
static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
980 981
				   bool deauth, bool self_disconnected,
				   u16 reason)
982
{
983
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
984
	struct ieee80211_local *local = sdata->local;
985 986
	struct ieee80211_conf *conf = &local_to_hw(local)->conf;
	struct ieee80211_bss *bss;
987
	struct sta_info *sta;
988
	u32 changed = 0, config_changed = 0;
989 990 991

	rcu_read_lock();

992
	sta = sta_info_get(local, ifmgd->bssid);
993 994 995 996 997 998
	if (!sta) {
		rcu_read_unlock();
		return;
	}

	if (deauth) {
999 1000
		ifmgd->direct_probe_tries = 0;
		ifmgd->auth_tries = 0;
1001
	}
1002 1003
	ifmgd->assoc_scan_tries = 0;
	ifmgd->assoc_tries = 0;
1004

1005
	netif_tx_stop_all_queues(sdata->dev);
1006 1007
	netif_carrier_off(sdata->dev);

1008
	ieee80211_sta_tear_down_BA_sessions(sta);
1009

1010 1011 1012 1013 1014 1015 1016 1017 1018
	bss = ieee80211_rx_bss_get(local, ifmgd->bssid,
				   conf->channel->center_freq,
				   ifmgd->ssid, ifmgd->ssid_len);

	if (bss) {
		cfg80211_unhold_bss(&bss->cbss);
		ieee80211_rx_bss_put(local, bss);
	}

1019 1020
	if (self_disconnected) {
		if (deauth)
1021 1022
			ieee80211_send_deauth_disassoc(sdata,
				IEEE80211_STYPE_DEAUTH, reason);
1023
		else
1024 1025
			ieee80211_send_deauth_disassoc(sdata,
				IEEE80211_STYPE_DISASSOC, reason);
1026 1027
	}

1028
	ifmgd->flags &= ~IEEE80211_STA_ASSOCIATED;
<