mlme.c 124.0 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/moduleparam.h>
20
#include <linux/rtnetlink.h>
21
#include <linux/pm_qos.h>
22
#include <linux/crc32.h>
23
#include <linux/slab.h>
24
#include <linux/export.h>
25
#include <net/mac80211.h>
26
#include <asm/unaligned.h>
J
Johannes Berg 已提交
27

28
#include "ieee80211_i.h"
29
#include "driver-ops.h"
J
Johannes Berg 已提交
30 31
#include "rate.h"
#include "led.h"
32

33
#define IEEE80211_AUTH_TIMEOUT		(HZ / 5)
34
#define IEEE80211_AUTH_TIMEOUT_LONG	(HZ / 2)
35 36 37 38
#define IEEE80211_AUTH_TIMEOUT_SHORT	(HZ / 10)
#define IEEE80211_AUTH_MAX_TRIES	3
#define IEEE80211_AUTH_WAIT_ASSOC	(HZ * 5)
#define IEEE80211_ASSOC_TIMEOUT		(HZ / 5)
39
#define IEEE80211_ASSOC_TIMEOUT_LONG	(HZ / 2)
40 41
#define IEEE80211_ASSOC_TIMEOUT_SHORT	(HZ / 10)
#define IEEE80211_ASSOC_MAX_TRIES	3
J
Johannes Berg 已提交
42

43 44 45 46 47 48 49 50 51
static int max_nullfunc_tries = 2;
module_param(max_nullfunc_tries, int, 0644);
MODULE_PARM_DESC(max_nullfunc_tries,
		 "Maximum nullfunc tx tries before disconnecting (reason 4).");

static int max_probe_tries = 5;
module_param(max_probe_tries, int, 0644);
MODULE_PARM_DESC(max_probe_tries,
		 "Maximum probe tries before disconnecting (reason 4).");
J
Johannes Berg 已提交
52 53

/*
54 55 56 57 58 59
 * Beacon loss timeout is calculated as N frames times the
 * advertised beacon interval.  This may need to be somewhat
 * higher than what hardware might detect to account for
 * delays in the host processing frames. But since we also
 * probe on beacon miss before declaring the connection lost
 * default to what we want.
J
Johannes Berg 已提交
60
 */
61 62 63 64
static int beacon_loss_count = 7;
module_param(beacon_loss_count, int, 0644);
MODULE_PARM_DESC(beacon_loss_count,
		 "Number of beacon intervals before we decide beacon was lost.");
65

J
Johannes Berg 已提交
66 67 68 69
/*
 * Time the connection can be idle before we probe
 * it to see if we can still talk to the AP.
 */
70
#define IEEE80211_CONNECTION_IDLE_TIME	(30 * HZ)
J
Johannes Berg 已提交
71 72 73 74 75
/*
 * Time we wait for a probe response after sending
 * a probe request because of beacon loss or for
 * checking the connection still works.
 */
76 77 78 79 80
static int probe_wait_ms = 500;
module_param(probe_wait_ms, int, 0644);
MODULE_PARM_DESC(probe_wait_ms,
		 "Maximum time(ms) to wait for probe response"
		 " before disconnecting (reason 4).");
81

82 83 84 85 86 87 88
/*
 * Weight given to the latest Beacon frame when calculating average signal
 * strength for Beacon frames received in the current BSS. This must be
 * between 1 and 15.
 */
#define IEEE80211_SIGNAL_AVE_WEIGHT	3

89 90 91 92 93 94
/*
 * How many Beacon frames need to have been used in average signal strength
 * before starting to indicate signal change events.
 */
#define IEEE80211_SIGNAL_AVE_MIN_COUNT	4

J
Johannes Berg 已提交
95 96 97 98 99 100 101 102 103 104
/*
 * We can have multiple work items (and connection probing)
 * scheduling this timer, but we need to take care to only
 * reschedule it when it should fire _earlier_ than it was
 * asked for before, or if it's not pending right now. This
 * function ensures that. Note that it then is required to
 * run this function for all timeouts after the first one
 * has happened -- the work that runs from this timer will
 * do that.
 */
105 106
static void run_again(struct ieee80211_sub_if_data *sdata,
		      unsigned long timeout)
J
Johannes Berg 已提交
107
{
108
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
109

110 111 112
	if (!timer_pending(&sdata->u.mgd.timer) ||
	    time_before(timeout, sdata->u.mgd.timer.expires))
		mod_timer(&sdata->u.mgd.timer, timeout);
J
Johannes Berg 已提交
113 114
}

115
void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
J
Johannes Berg 已提交
116
{
117
	if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
J
Johannes Berg 已提交
118 119
		return;

120 121 122
	if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
		return;

J
Johannes Berg 已提交
123
	mod_timer(&sdata->u.mgd.bcn_mon_timer,
124
		  round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
J
Johannes Berg 已提交
125 126
}

127 128
void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
{
129 130
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

131 132 133
	if (unlikely(!sdata->u.mgd.associated))
		return;

134 135 136 137 138
	if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
		return;

	mod_timer(&sdata->u.mgd.conn_mon_timer,
		  round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
139 140

	ifmgd->probe_send_count = 0;
141 142
}

143
static int ecw2cw(int ecw)
J
Johannes Berg 已提交
144
{
145
	return (1 << ecw) - 1;
J
Johannes Berg 已提交
146 147
}

148 149 150 151 152 153
static u32
ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
			     struct ieee80211_supported_band *sband,
			     struct ieee80211_channel *channel,
			     const struct ieee80211_ht_operation *ht_oper,
			     const struct ieee80211_vht_operation *vht_oper,
154
			     struct cfg80211_chan_def *chandef, bool tracking)
155
{
156
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174
	struct cfg80211_chan_def vht_chandef;
	u32 ht_cfreq, ret;

	chandef->chan = channel;
	chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
	chandef->center_freq1 = channel->center_freq;
	chandef->center_freq2 = 0;

	if (!ht_oper || !sband->ht_cap.ht_supported) {
		ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
		goto out;
	}

	chandef->width = NL80211_CHAN_WIDTH_20;

	ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
						  channel->band);
	/* check that channel matches the right operating channel */
175
	if (!tracking && channel->center_freq != ht_cfreq) {
176 177 178 179 180 181 182
		/*
		 * It's possible that some APs are confused here;
		 * Netgear WNDR3700 sometimes reports 4 higher than
		 * the actual channel in association responses, but
		 * since we look at probe response/beacon data here
		 * it should be OK.
		 */
183 184 185 186
		sdata_info(sdata,
			   "Wrong control channel: center-freq: %d ht-cfreq: %d ht->primary_chan: %d band: %d - Disabling HT\n",
			   channel->center_freq, ht_cfreq,
			   ht_oper->primary_chan, channel->band);
187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205
		ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
		goto out;
	}

	/* check 40 MHz support, if we have it */
	if (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
		switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
		case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
			chandef->width = NL80211_CHAN_WIDTH_40;
			chandef->center_freq1 += 10;
			break;
		case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
			chandef->width = NL80211_CHAN_WIDTH_40;
			chandef->center_freq1 -= 10;
			break;
		}
	} else {
		/* 40 MHz (and 80 MHz) must be supported for VHT */
		ret = IEEE80211_STA_DISABLE_VHT;
206 207
		/* also mark 40 MHz disabled */
		ret |= IEEE80211_STA_DISABLE_40MHZ;
208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233
		goto out;
	}

	if (!vht_oper || !sband->vht_cap.vht_supported) {
		ret = IEEE80211_STA_DISABLE_VHT;
		goto out;
	}

	vht_chandef.chan = channel;
	vht_chandef.center_freq1 =
		ieee80211_channel_to_frequency(vht_oper->center_freq_seg1_idx,
					       channel->band);
	vht_chandef.center_freq2 = 0;

	switch (vht_oper->chan_width) {
	case IEEE80211_VHT_CHANWIDTH_USE_HT:
		vht_chandef.width = chandef->width;
		break;
	case IEEE80211_VHT_CHANWIDTH_80MHZ:
		vht_chandef.width = NL80211_CHAN_WIDTH_80;
		break;
	case IEEE80211_VHT_CHANWIDTH_160MHZ:
		vht_chandef.width = NL80211_CHAN_WIDTH_160;
		break;
	case IEEE80211_VHT_CHANWIDTH_80P80MHZ:
		vht_chandef.width = NL80211_CHAN_WIDTH_80P80;
234 235 236 237
		vht_chandef.center_freq2 =
			ieee80211_channel_to_frequency(
				vht_oper->center_freq_seg2_idx,
				channel->band);
238 239
		break;
	default:
240
		if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
241 242 243
			sdata_info(sdata,
				   "AP VHT operation IE has invalid channel width (%d), disable VHT\n",
				   vht_oper->chan_width);
244 245 246 247 248
		ret = IEEE80211_STA_DISABLE_VHT;
		goto out;
	}

	if (!cfg80211_chandef_valid(&vht_chandef)) {
249
		if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
250 251
			sdata_info(sdata,
				   "AP VHT information is invalid, disable VHT\n");
252 253 254 255 256 257 258 259 260 261
		ret = IEEE80211_STA_DISABLE_VHT;
		goto out;
	}

	if (cfg80211_chandef_identical(chandef, &vht_chandef)) {
		ret = 0;
		goto out;
	}

	if (!cfg80211_chandef_compatible(chandef, &vht_chandef)) {
262
		if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
263 264
			sdata_info(sdata,
				   "AP VHT information doesn't match HT, disable VHT\n");
265 266 267 268 269 270 271 272 273
		ret = IEEE80211_STA_DISABLE_VHT;
		goto out;
	}

	*chandef = vht_chandef;

	ret = 0;

out:
274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295
	/*
	 * When tracking the current AP, don't do any further checks if the
	 * new chandef is identical to the one we're currently using for the
	 * connection. This keeps us from playing ping-pong with regulatory,
	 * without it the following can happen (for example):
	 *  - connect to an AP with 80 MHz, world regdom allows 80 MHz
	 *  - AP advertises regdom US
	 *  - CRDA loads regdom US with 80 MHz prohibited (old database)
	 *  - the code below detects an unsupported channel, downgrades, and
	 *    we disconnect from the AP in the caller
	 *  - disconnect causes CRDA to reload world regdomain and the game
	 *    starts anew.
	 * (see https://bugzilla.kernel.org/show_bug.cgi?id=70881)
	 *
	 * It seems possible that there are still scenarios with CSA or real
	 * bandwidth changes where a this could happen, but those cases are
	 * less common and wouldn't completely prevent using the AP.
	 */
	if (tracking &&
	    cfg80211_chandef_identical(chandef, &sdata->vif.bss_conf.chandef))
		return ret;

296 297 298 299
	/* don't print the message below for VHT mismatch if VHT is disabled */
	if (ret & IEEE80211_STA_DISABLE_VHT)
		vht_chandef = *chandef;

300 301 302 303 304 305 306 307
	/*
	 * Ignore the DISABLED flag when we're already connected and only
	 * tracking the APs beacon for bandwidth changes - otherwise we
	 * might get disconnected here if we connect to an AP, update our
	 * regulatory information based on the AP's country IE and the
	 * information we have is wrong/outdated and disables the channel
	 * that we're actually using for the connection to the AP.
	 */
308
	while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
309 310
					tracking ? 0 :
						   IEEE80211_CHAN_DISABLED)) {
311 312 313
		if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
			ret = IEEE80211_STA_DISABLE_HT |
			      IEEE80211_STA_DISABLE_VHT;
314
			break;
315 316
		}

317
		ret |= ieee80211_chandef_downgrade(chandef);
318 319
	}

320
	if (chandef->width != vht_chandef.width && !tracking)
321 322 323 324 325 326 327
		sdata_info(sdata,
			   "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n");

	WARN_ON_ONCE(!cfg80211_chandef_valid(chandef));
	return ret;
}

328 329 330 331 332
static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata,
			       struct sta_info *sta,
			       const struct ieee80211_ht_operation *ht_oper,
			       const struct ieee80211_vht_operation *vht_oper,
			       const u8 *bssid, u32 *changed)
333 334
{
	struct ieee80211_local *local = sdata->local;
335
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
336
	struct ieee80211_supported_band *sband;
J
Johannes Berg 已提交
337
	struct ieee80211_channel *chan;
338
	struct cfg80211_chan_def chandef;
339
	u16 ht_opmode;
340 341 342
	u32 flags;
	enum ieee80211_sta_rx_bandwidth new_sta_bw;
	int ret;
343

344 345
	/* if HT was/is disabled, don't track any bandwidth changes */
	if (ifmgd->flags & IEEE80211_STA_DISABLE_HT || !ht_oper)
346 347
		return 0;

348 349 350 351 352 353 354
	/* don't check VHT if we associated as non-VHT station */
	if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
		vht_oper = NULL;

	if (WARN_ON_ONCE(!sta))
		return -EINVAL;

355 356 357 358 359 360 361 362 363 364
	/*
	 * if bss configuration changed store the new one -
	 * this may be applicable even if channel is identical
	 */
	ht_opmode = le16_to_cpu(ht_oper->operation_mode);
	if (sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
		*changed |= BSS_CHANGED_HT;
		sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
	}

365
	chan = sdata->vif.bss_conf.chandef.chan;
J
Johannes Berg 已提交
366
	sband = local->hw.wiphy->bands[chan->band];
367

368 369
	/* calculate new channel (type) based on HT/VHT operation IEs */
	flags = ieee80211_determine_chantype(sdata, sband, chan, ht_oper,
370
					     vht_oper, &chandef, true);
371 372 373 374 375 376 377 378 379 380

	/*
	 * Downgrade the new channel if we associated with restricted
	 * capabilities. For example, if we associated as a 20 MHz STA
	 * to a 40 MHz AP (due to regulatory, capabilities or config
	 * reasons) then switching to a 40 MHz channel now won't do us
	 * any good -- we couldn't use it with the AP.
	 */
	if (ifmgd->flags & IEEE80211_STA_DISABLE_80P80MHZ &&
	    chandef.width == NL80211_CHAN_WIDTH_80P80)
381
		flags |= ieee80211_chandef_downgrade(&chandef);
382 383
	if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
	    chandef.width == NL80211_CHAN_WIDTH_160)
384
		flags |= ieee80211_chandef_downgrade(&chandef);
385 386
	if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
	    chandef.width > NL80211_CHAN_WIDTH_20)
387
		flags |= ieee80211_chandef_downgrade(&chandef);
388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413

	if (cfg80211_chandef_identical(&chandef, &sdata->vif.bss_conf.chandef))
		return 0;

	sdata_info(sdata,
		   "AP %pM changed bandwidth, new config is %d MHz, width %d (%d/%d MHz)\n",
		   ifmgd->bssid, chandef.chan->center_freq, chandef.width,
		   chandef.center_freq1, chandef.center_freq2);

	if (flags != (ifmgd->flags & (IEEE80211_STA_DISABLE_HT |
				      IEEE80211_STA_DISABLE_VHT |
				      IEEE80211_STA_DISABLE_40MHZ |
				      IEEE80211_STA_DISABLE_80P80MHZ |
				      IEEE80211_STA_DISABLE_160MHZ)) ||
	    !cfg80211_chandef_valid(&chandef)) {
		sdata_info(sdata,
			   "AP %pM changed bandwidth in a way we can't support - disconnect\n",
			   ifmgd->bssid);
		return -EINVAL;
	}

	switch (chandef.width) {
	case NL80211_CHAN_WIDTH_20_NOHT:
	case NL80211_CHAN_WIDTH_20:
		new_sta_bw = IEEE80211_STA_RX_BW_20;
		break;
414
	case NL80211_CHAN_WIDTH_40:
415
		new_sta_bw = IEEE80211_STA_RX_BW_40;
416
		break;
417 418 419 420 421 422
	case NL80211_CHAN_WIDTH_80:
		new_sta_bw = IEEE80211_STA_RX_BW_80;
		break;
	case NL80211_CHAN_WIDTH_80P80:
	case NL80211_CHAN_WIDTH_160:
		new_sta_bw = IEEE80211_STA_RX_BW_160;
423
		break;
424 425
	default:
		return -EINVAL;
426
	}
427

428 429
	if (new_sta_bw > sta->cur_max_bandwidth)
		new_sta_bw = sta->cur_max_bandwidth;
430

431 432 433 434 435
	if (new_sta_bw < sta->sta.bandwidth) {
		sta->sta.bandwidth = new_sta_bw;
		rate_control_rate_update(local, sband, sta,
					 IEEE80211_RC_BW_CHANGED);
	}
436

437 438 439 440 441 442 443
	ret = ieee80211_vif_change_bandwidth(sdata, &chandef, changed);
	if (ret) {
		sdata_info(sdata,
			   "AP %pM changed bandwidth to incompatible one - disconnect\n",
			   ifmgd->bssid);
		return ret;
	}
444

445 446 447 448
	if (new_sta_bw > sta->sta.bandwidth) {
		sta->sta.bandwidth = new_sta_bw;
		rate_control_rate_update(local, sband, sta,
					 IEEE80211_RC_BW_CHANGED);
449
	}
450

451
	return 0;
452 453
}

J
Johannes Berg 已提交
454 455
/* frame sending functions */

J
Johannes Berg 已提交
456
static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
457
				struct sk_buff *skb, u8 ap_ht_param,
J
Johannes Berg 已提交
458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474
				struct ieee80211_supported_band *sband,
				struct ieee80211_channel *channel,
				enum ieee80211_smps_mode smps)
{
	u8 *pos;
	u32 flags = channel->flags;
	u16 cap;
	struct ieee80211_sta_ht_cap ht_cap;

	BUILD_BUG_ON(sizeof(ht_cap) != sizeof(sband->ht_cap));

	memcpy(&ht_cap, &sband->ht_cap, sizeof(ht_cap));
	ieee80211_apply_htcap_overrides(sdata, &ht_cap);

	/* determine capability flags */
	cap = ht_cap.cap;

475
	switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
J
Johannes Berg 已提交
476 477 478 479 480 481 482 483 484 485 486 487 488 489
	case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
		if (flags & IEEE80211_CHAN_NO_HT40PLUS) {
			cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
			cap &= ~IEEE80211_HT_CAP_SGI_40;
		}
		break;
	case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
		if (flags & IEEE80211_CHAN_NO_HT40MINUS) {
			cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
			cap &= ~IEEE80211_HT_CAP_SGI_40;
		}
		break;
	}

490 491 492 493 494 495 496 497 498 499
	/*
	 * If 40 MHz was disabled associate as though we weren't
	 * capable of 40 MHz -- some broken APs will never fall
	 * back to trying to transmit in 20 MHz.
	 */
	if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_40MHZ) {
		cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
		cap &= ~IEEE80211_HT_CAP_SGI_40;
	}

J
Johannes Berg 已提交
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
	/* set SM PS mode properly */
	cap &= ~IEEE80211_HT_CAP_SM_PS;
	switch (smps) {
	case IEEE80211_SMPS_AUTOMATIC:
	case IEEE80211_SMPS_NUM_MODES:
		WARN_ON(1);
	case IEEE80211_SMPS_OFF:
		cap |= WLAN_HT_CAP_SM_PS_DISABLED <<
			IEEE80211_HT_CAP_SM_PS_SHIFT;
		break;
	case IEEE80211_SMPS_STATIC:
		cap |= WLAN_HT_CAP_SM_PS_STATIC <<
			IEEE80211_HT_CAP_SM_PS_SHIFT;
		break;
	case IEEE80211_SMPS_DYNAMIC:
		cap |= WLAN_HT_CAP_SM_PS_DYNAMIC <<
			IEEE80211_HT_CAP_SM_PS_SHIFT;
		break;
	}

	/* reserve and fill IE */
	pos = skb_put(skb, sizeof(struct ieee80211_ht_cap) + 2);
	ieee80211_ie_build_ht_cap(pos, &ht_cap, cap);
}

525 526
static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
				 struct sk_buff *skb,
527 528
				 struct ieee80211_supported_band *sband,
				 struct ieee80211_vht_cap *ap_vht_cap)
529 530 531 532 533 534 535 536
{
	u8 *pos;
	u32 cap;
	struct ieee80211_sta_vht_cap vht_cap;

	BUILD_BUG_ON(sizeof(vht_cap) != sizeof(sband->vht_cap));

	memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
537
	ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
538 539 540 541

	/* determine capability flags */
	cap = vht_cap.cap;

J
Johannes Berg 已提交
542 543 544 545 546 547 548 549 550 551
	if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
		cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ;
		cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
	}

	if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
		cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
		cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
	}

552 553 554 555 556 557 558 559
	/*
	 * Some APs apparently get confused if our capabilities are better
	 * than theirs, so restrict what we advertise in the assoc request.
	 */
	if (!(ap_vht_cap->vht_cap_info &
			cpu_to_le32(IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE)))
		cap &= ~IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE;

560
	/* reserve and fill IE */
M
Mahesh Palivela 已提交
561
	pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
562 563 564
	ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
}

J
Johannes Berg 已提交
565 566 567 568 569 570 571 572 573
static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
	struct sk_buff *skb;
	struct ieee80211_mgmt *mgmt;
	u8 *pos, qos_info;
	size_t offset = 0, noffset;
574
	int i, count, rates_len, supp_rates_len, shift;
J
Johannes Berg 已提交
575 576
	u16 capab;
	struct ieee80211_supported_band *sband;
J
Johannes Berg 已提交
577 578
	struct ieee80211_chanctx_conf *chanctx_conf;
	struct ieee80211_channel *chan;
579
	u32 rate_flags, rates = 0;
J
Johannes Berg 已提交
580

581
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
582

J
Johannes Berg 已提交
583 584 585 586 587 588
	rcu_read_lock();
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
	if (WARN_ON(!chanctx_conf)) {
		rcu_read_unlock();
		return;
	}
589
	chan = chanctx_conf->def.chan;
590
	rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
J
Johannes Berg 已提交
591 592
	rcu_read_unlock();
	sband = local->hw.wiphy->bands[chan->band];
593
	shift = ieee80211_vif_get_shift(&sdata->vif);
J
Johannes Berg 已提交
594 595 596 597 598 599 600 601

	if (assoc_data->supp_rates_len) {
		/*
		 * 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)...
		 */
602 603 604 605
		rates_len = ieee80211_parse_bitrates(&chanctx_conf->def, sband,
						     assoc_data->supp_rates,
						     assoc_data->supp_rates_len,
						     &rates);
J
Johannes Berg 已提交
606 607 608 609 610 611
	} else {
		/*
		 * In case AP not provide any supported rates information
		 * before association, we send information element(s) with
		 * all rates that we support.
		 */
612 613 614 615 616 617 618 619
		rates_len = 0;
		for (i = 0; i < sband->n_bitrates; i++) {
			if ((rate_flags & sband->bitrates[i].flags)
			    != rate_flags)
				continue;
			rates |= BIT(i);
			rates_len++;
		}
J
Johannes Berg 已提交
620 621 622 623 624 625 626 627 628
	}

	skb = alloc_skb(local->hw.extra_tx_headroom +
			sizeof(*mgmt) + /* bit too much but doesn't matter */
			2 + assoc_data->ssid_len + /* SSID */
			4 + rates_len + /* (extended) rates */
			4 + /* power capability */
			2 + 2 * sband->n_channels + /* supported channels */
			2 + sizeof(struct ieee80211_ht_cap) + /* HT */
M
Mahesh Palivela 已提交
629
			2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
J
Johannes Berg 已提交
630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695
			assoc_data->ie_len + /* extra IEs */
			9, /* WMM */
			GFP_KERNEL);
	if (!skb)
		return;

	skb_reserve(skb, local->hw.extra_tx_headroom);

	capab = WLAN_CAPABILITY_ESS;

	if (sband->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;
	}

	if (assoc_data->capability & WLAN_CAPABILITY_PRIVACY)
		capab |= WLAN_CAPABILITY_PRIVACY;

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

	mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
	memset(mgmt, 0, 24);
	memcpy(mgmt->da, assoc_data->bss->bssid, ETH_ALEN);
	memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
	memcpy(mgmt->bssid, assoc_data->bss->bssid, ETH_ALEN);

	if (!is_zero_ether_addr(assoc_data->prev_bssid)) {
		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, assoc_data->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);
		mgmt->u.assoc_req.listen_interval =
				cpu_to_le16(local->hw.conf.listen_interval);
	}

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

	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) {
696 697 698
			int rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
						5 * (1 << shift));
			*pos++ = (u8) rate;
J
Johannes Berg 已提交
699 700 701 702 703 704 705 706 707 708 709 710
			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) {
711 712 713 714
				int rate;
				rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
						    5 * (1 << shift));
				*pos++ = (u8) rate;
J
Johannes Berg 已提交
715 716 717 718 719 720 721 722 723 724
			}
		}
	}

	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 */
725 726
		 /* max tx power */
		*pos++ = ieee80211_chandef_max_power(&chanctx_conf->def);
J
Johannes Berg 已提交
727 728 729 730 731 732 733 734 735 736 737 738 739 740

		/* 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 present, add any custom IEs that go before HT */
741
	if (assoc_data->ie_len) {
J
Johannes Berg 已提交
742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761
		static const u8 before_ht[] = {
			WLAN_EID_SSID,
			WLAN_EID_SUPP_RATES,
			WLAN_EID_EXT_SUPP_RATES,
			WLAN_EID_PWR_CAPABILITY,
			WLAN_EID_SUPPORTED_CHANNELS,
			WLAN_EID_RSN,
			WLAN_EID_QOS_CAPA,
			WLAN_EID_RRM_ENABLED_CAPABILITIES,
			WLAN_EID_MOBILITY_DOMAIN,
			WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
		};
		noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
					     before_ht, ARRAY_SIZE(before_ht),
					     offset);
		pos = skb_put(skb, noffset - offset);
		memcpy(pos, assoc_data->ie + offset, noffset - offset);
		offset = noffset;
	}

J
Johannes Berg 已提交
762 763 764 765
	if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
			 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
		ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;

766
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
767
		ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
768
				    sband, chan, sdata->smps_mode);
J
Johannes Berg 已提交
769

770
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
771 772
		ieee80211_add_vht_ie(sdata, skb, sband,
				     &assoc_data->ap_vht_cap);
773

J
Johannes Berg 已提交
774
	/* if present, add any custom non-vendor IEs that go after HT */
775
	if (assoc_data->ie_len) {
J
Johannes Berg 已提交
776 777 778 779 780 781 782 783
		noffset = ieee80211_ie_split_vendor(assoc_data->ie,
						    assoc_data->ie_len,
						    offset);
		pos = skb_put(skb, noffset - offset);
		memcpy(pos, assoc_data->ie + offset, noffset - offset);
		offset = noffset;
	}

784 785
	if (assoc_data->wmm) {
		if (assoc_data->uapsd) {
786 787
			qos_info = ifmgd->uapsd_queues;
			qos_info |= (ifmgd->uapsd_max_sp_len <<
J
Johannes Berg 已提交
788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805
				     IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
		} else {
			qos_info = 0;
		}

		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++ = qos_info;
	}

	/* add any remaining custom (i.e. vendor specific here) IEs */
806
	if (assoc_data->ie_len) {
J
Johannes Berg 已提交
807 808 809 810 811
		noffset = assoc_data->ie_len;
		pos = skb_put(skb, noffset - offset);
		memcpy(pos, assoc_data->ie + offset, noffset - offset);
	}

J
Johannes Berg 已提交
812 813
	drv_mgd_prepare_tx(local, sdata);

J
Johannes Berg 已提交
814
	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
815 816 817
	if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
		IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
						IEEE80211_TX_INTFL_MLME_CONN_TX;
J
Johannes Berg 已提交
818 819 820
	ieee80211_tx_skb(sdata, skb);
}

821 822 823 824 825 826
void ieee80211_send_pspoll(struct ieee80211_local *local,
			   struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_pspoll *pspoll;
	struct sk_buff *skb;

827 828
	skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
	if (!skb)
829 830
		return;

831 832
	pspoll = (struct ieee80211_pspoll *) skb->data;
	pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
833

834 835
	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
	ieee80211_tx_skb(sdata, skb);
836 837
}

838 839 840 841 842
void ieee80211_send_nullfunc(struct ieee80211_local *local,
			     struct ieee80211_sub_if_data *sdata,
			     int powersave)
{
	struct sk_buff *skb;
843
	struct ieee80211_hdr_3addr *nullfunc;
844
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
845

846 847
	skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
	if (!skb)
848 849
		return;

850
	nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
851
	if (powersave)
852
		nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
853

854 855
	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
					IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
856 857 858 859

	if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
		IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;

860
	if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
861 862
		IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;

863
	ieee80211_tx_skb(sdata, skb);
864 865
}

866 867 868 869 870 871 872 873 874 875 876
static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
					  struct ieee80211_sub_if_data *sdata)
{
	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 + 30);
877
	if (!skb)
878
		return;
879

880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895
	skb_reserve(skb, local->hw.extra_tx_headroom);

	nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
	memset(nullfunc, 0, 30);
	fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
			 IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
	nullfunc->frame_control = fc;
	memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
	memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
	memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
	memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);

	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
	ieee80211_tx_skb(sdata, skb);
}

896 897 898 899 900
/* spectrum management related things */
static void ieee80211_chswitch_work(struct work_struct *work)
{
	struct ieee80211_sub_if_data *sdata =
		container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
901
	struct ieee80211_local *local = sdata->local;
902
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
903 904
	u32 changed = 0;
	int ret;
905

906
	if (!ieee80211_sdata_running(sdata))
907 908
		return;

909
	sdata_lock(sdata);
910 911
	if (!ifmgd->associated)
		goto out;
912

913
	mutex_lock(&local->mtx);
914
	ret = ieee80211_vif_change_channel(sdata, &changed);
915
	mutex_unlock(&local->mtx);
916 917 918 919 920 921 922
	if (ret) {
		sdata_info(sdata,
			   "vif channel switch failed, disconnecting\n");
		ieee80211_queue_work(&sdata->local->hw,
				     &ifmgd->csa_connection_drop_work);
		goto out;
	}
923

924
	if (!local->use_chanctx) {
925
		local->_oper_chandef = sdata->csa_chandef;
926 927 928 929 930 931 932
		/* Call "hw_config" only if doing sw channel switch.
		 * Otherwise update the channel directly
		 */
		if (!local->ops->channel_switch)
			ieee80211_hw_config(local, 0);
		else
			local->hw.conf.chandef = local->_oper_chandef;
933
	}
934

935
	/* XXX: shouldn't really modify cfg80211-owned data! */
936
	ifmgd->associated->channel = sdata->csa_chandef.chan;
937

938
	/* XXX: wait for a beacon first? */
939
	ieee80211_wake_queues_by_reason(&local->hw,
940
					IEEE80211_MAX_QUEUE_MAP,
941
					IEEE80211_QUEUE_STOP_REASON_CSA);
942 943 944

	ieee80211_bss_info_change_notify(sdata, changed);

945
 out:
946
	sdata->vif.csa_active = false;
947
	ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
948
	sdata_unlock(sdata);
949 950
}

951 952
void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
{
J
Johannes Berg 已提交
953 954
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
955 956 957

	trace_api_chswitch_done(sdata, success);
	if (!success) {
958 959 960 961 962 963
		sdata_info(sdata,
			   "driver channel switch failed, disconnecting\n");
		ieee80211_queue_work(&sdata->local->hw,
				     &ifmgd->csa_connection_drop_work);
	} else {
		ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
964 965 966 967
	}
}
EXPORT_SYMBOL(ieee80211_chswitch_done);

968 969 970 971
static void ieee80211_chswitch_timer(unsigned long data)
{
	struct ieee80211_sub_if_data *sdata =
		(struct ieee80211_sub_if_data *) data;
972

973
	ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
974 975
}

976
static void
J
Johannes Berg 已提交
977
ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
978 979
				 u64 timestamp, struct ieee802_11_elems *elems,
				 bool beacon)
980
{
981
	struct ieee80211_local *local = sdata->local;
982
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
983
	struct cfg80211_bss *cbss = ifmgd->associated;
J
Johannes Berg 已提交
984
	struct ieee80211_chanctx *chanctx;
985
	enum ieee80211_band current_band;
986
	struct ieee80211_csa_ie csa_ie;
987
	int res;
988

989
	sdata_assert_lock(sdata);
990

991
	if (!cbss)
992 993
		return;

994
	if (local->scanning)
995 996
		return;

997
	/* disregard subsequent announcements if we are already processing */
998 999 1000
	if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
		return;

1001
	current_band = cbss->channel->band;
1002
	memset(&csa_ie, 0, sizeof(csa_ie));
1003 1004
	res = ieee80211_parse_ch_switch_ie(sdata, elems, beacon, current_band,
					   ifmgd->flags,
1005
					   ifmgd->associated->bssid, &csa_ie);
1006
	if (res	< 0)
1007
		ieee80211_queue_work(&local->hw,
1008
				     &ifmgd->csa_connection_drop_work);
1009
	if (res)
1010
		return;
1011

1012
	if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
1013 1014 1015
				     IEEE80211_CHAN_DISABLED)) {
		sdata_info(sdata,
			   "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1016
			   ifmgd->associated->bssid,
1017 1018 1019
			   csa_ie.chandef.chan->center_freq,
			   csa_ie.chandef.width, csa_ie.chandef.center_freq1,
			   csa_ie.chandef.center_freq2);
1020 1021 1022 1023 1024
		ieee80211_queue_work(&local->hw,
				     &ifmgd->csa_connection_drop_work);
		return;
	}

1025
	ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
1026
	sdata->vif.csa_active = true;
1027

1028
	mutex_lock(&local->chanctx_mtx);
1029
	if (local->use_chanctx) {
1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042
		u32 num_chanctx = 0;
		list_for_each_entry(chanctx, &local->chanctx_list, list)
		       num_chanctx++;

		if (num_chanctx > 1 ||
		    !(local->hw.flags & IEEE80211_HW_CHANCTX_STA_CSA)) {
			sdata_info(sdata,
				   "not handling chan-switch with channel contexts\n");
			ieee80211_queue_work(&local->hw,
					     &ifmgd->csa_connection_drop_work);
			mutex_unlock(&local->chanctx_mtx);
			return;
		}
J
Johannes Berg 已提交
1043 1044 1045
	}

	if (WARN_ON(!rcu_access_pointer(sdata->vif.chanctx_conf))) {
1046 1047
		ieee80211_queue_work(&local->hw,
				     &ifmgd->csa_connection_drop_work);
1048
		mutex_unlock(&local->chanctx_mtx);
J
Johannes Berg 已提交
1049 1050 1051 1052 1053 1054 1055
		return;
	}
	chanctx = container_of(rcu_access_pointer(sdata->vif.chanctx_conf),
			       struct ieee80211_chanctx, conf);
	if (chanctx->refcount > 1) {
		sdata_info(sdata,
			   "channel switch with multiple interfaces on the same channel, disconnecting\n");
1056
		ieee80211_queue_work(&local->hw,
J
Johannes Berg 已提交
1057
				     &ifmgd->csa_connection_drop_work);
1058
		mutex_unlock(&local->chanctx_mtx);
J
Johannes Berg 已提交
1059 1060
		return;
	}
1061
	mutex_unlock(&local->chanctx_mtx);
J
Johannes Berg 已提交
1062

1063
	sdata->csa_chandef = csa_ie.chandef;
J
Johannes Berg 已提交
1064

1065
	if (csa_ie.mode)
1066
		ieee80211_stop_queues_by_reason(&local->hw,
1067
				IEEE80211_MAX_QUEUE_MAP,
1068 1069
				IEEE80211_QUEUE_STOP_REASON_CSA);

1070
	if (local->ops->channel_switch) {
1071
		/* use driver's channel switch callback */
1072 1073
		struct ieee80211_channel_switch ch_switch = {
			.timestamp = timestamp,
1074 1075 1076
			.block_tx = csa_ie.mode,
			.chandef = csa_ie.chandef,
			.count = csa_ie.count,
1077 1078
		};

1079
		drv_channel_switch(local, &ch_switch);
1080 1081 1082 1083
		return;
	}

	/* channel switch handled in software */
1084
	if (csa_ie.count <= 1)
1085
		ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1086
	else
1087
		mod_timer(&ifmgd->chswitch_timer,
1088
			  TU_TO_EXP_TIME(csa_ie.count * cbss->beacon_interval));
1089 1090
}

1091 1092 1093 1094
static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
				       struct ieee80211_channel *channel,
				       const u8 *country_ie, u8 country_ie_len,
				       const u8 *pwr_constr_elem)
1095
{
1096 1097 1098 1099
	struct ieee80211_country_ie_triplet *triplet;
	int chan = ieee80211_frequency_to_channel(channel->center_freq);
	int i, chan_pwr, chan_increment, new_ap_level;
	bool have_chan_pwr = false;
1100

1101 1102
	/* Invalid IE */
	if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1103
		return 0;
1104

1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118
	triplet = (void *)(country_ie + 3);
	country_ie_len -= 3;

	switch (channel->band) {
	default:
		WARN_ON_ONCE(1);
		/* fall through */
	case IEEE80211_BAND_2GHZ:
	case IEEE80211_BAND_60GHZ:
		chan_increment = 1;
		break;
	case IEEE80211_BAND_5GHZ:
		chan_increment = 4;
		break;
1119
	}
1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143

	/* find channel */
	while (country_ie_len >= 3) {
		u8 first_channel = triplet->chans.first_channel;

		if (first_channel >= IEEE80211_COUNTRY_EXTENSION_ID)
			goto next;

		for (i = 0; i < triplet->chans.num_channels; i++) {
			if (first_channel + i * chan_increment == chan) {
				have_chan_pwr = true;
				chan_pwr = triplet->chans.max_power;
				break;
			}
		}
		if (have_chan_pwr)
			break;

 next:
		triplet++;
		country_ie_len -= 3;
	}

	if (!have_chan_pwr)
1144
		return 0;
1145 1146 1147

	new_ap_level = max_t(int, 0, chan_pwr - *pwr_constr_elem);

1148 1149
	if (sdata->ap_power_level == new_ap_level)
		return 0;
1150 1151 1152 1153 1154

	sdata_info(sdata,
		   "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
		   new_ap_level, chan_pwr, *pwr_constr_elem,
		   sdata->u.mgd.bssid);
1155 1156 1157 1158
	sdata->ap_power_level = new_ap_level;
	if (__ieee80211_recalc_txpower(sdata))
		return BSS_CHANGED_TXPOWER;
	return 0;
1159 1160
}

1161 1162 1163 1164 1165 1166
/* powersave */
static void ieee80211_enable_ps(struct ieee80211_local *local,
				struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_conf *conf = &local->hw.conf;

J
Johannes Berg 已提交
1167 1168 1169 1170
	/*
	 * If we are scanning right now then the parameters will
	 * take effect when scan finishes.
	 */
1171
	if (local->scanning)
J
Johannes Berg 已提交
1172 1173
		return;

1174 1175 1176 1177 1178 1179 1180
	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);
1181

1182 1183 1184 1185 1186 1187
		if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
		    (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
			return;

		conf->flags |= IEEE80211_CONF_PS;
		ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204
	}
}

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

	if (local->ps_sdata) {
		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);
	}
}

1205 1206 1207 1208
static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *mgd = &sdata->u.mgd;
	struct sta_info *sta = NULL;
J
Johannes Berg 已提交
1209
	bool authorized = false;
1210 1211 1212 1213

	if (!mgd->powersave)
		return false;

1214 1215 1216
	if (mgd->broken_ap)
		return false;

1217 1218 1219
	if (!mgd->associated)
		return false;

1220
	if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
1221 1222
		return false;

1223
	if (!mgd->have_beacon)
1224 1225
		return false;

1226 1227 1228
	rcu_read_lock();
	sta = sta_info_get(sdata, mgd->bssid);
	if (sta)
J
Johannes Berg 已提交
1229
		authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1230 1231
	rcu_read_unlock();

J
Johannes Berg 已提交
1232
	return authorized;
1233 1234
}

1235
/* need to hold RTNL or interface lock */
1236
void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
1237 1238 1239
{
	struct ieee80211_sub_if_data *sdata, *found = NULL;
	int count = 0;
1240
	int timeout;
1241 1242 1243 1244 1245 1246 1247

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

	list_for_each_entry(sdata, &local->interfaces, list) {
1248
		if (!ieee80211_sdata_running(sdata))
1249
			continue;
1250 1251 1252 1253 1254 1255 1256 1257
		if (sdata->vif.type == NL80211_IFTYPE_AP) {
			/* If an AP vif is found, then disable PS
			 * by setting the count to zero thereby setting
			 * ps_sdata to NULL.
			 */
			count = 0;
			break;
		}
1258 1259 1260 1261 1262 1263
		if (sdata->vif.type != NL80211_IFTYPE_STATION)
			continue;
		found = sdata;
		count++;
	}

1264
	if (count == 1 && ieee80211_powersave_allowed(found)) {
1265 1266 1267
		s32 beaconint_us;

		if (latency < 0)
M
Mark Gross 已提交
1268
			latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
1269 1270 1271 1272

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

1273
		timeout = local->dynamic_ps_forced_timeout;
1274 1275
		if (timeout < 0) {
			/*
1276 1277
			 * Go to full PSM if the user configures a very low
			 * latency requirement.
1278 1279 1280
			 * The 2000 second value is there for compatibility
			 * until the PM_QOS_NETWORK_LATENCY is configured
			 * with real values.
1281
			 */
1282 1283
			if (latency > (1900 * USEC_PER_MSEC) &&
			    latency != (2000 * USEC_PER_SEC))
1284
				timeout = 0;
1285 1286
			else
				timeout = 100;
1287
		}
1288
		local->hw.conf.dynamic_ps_timeout = timeout;
1289

1290
		if (beaconint_us > latency) {
1291
			local->ps_sdata = NULL;
1292 1293
		} else {
			int maxslp = 1;
1294
			u8 dtimper = found->u.mgd.dtim_period;
1295 1296 1297 1298 1299

			/* If the TIM IE is invalid, pretend the value is 1 */
			if (!dtimper)
				dtimper = 1;
			else if (dtimper > 1)
1300 1301 1302
				maxslp = min_t(int, dtimper,
						    latency / beaconint_us);

1303
			local->hw.conf.max_sleep_period = maxslp;
1304
			local->hw.conf.ps_dtim_period = dtimper;
1305
			local->ps_sdata = found;
1306
		}
1307
	} else {
1308
		local->ps_sdata = NULL;
1309
	}
1310 1311 1312 1313

	ieee80211_change_ps(local);
}

E
Eliad Peller 已提交
1314 1315 1316 1317 1318 1319 1320 1321 1322 1323
void ieee80211_recalc_ps_vif(struct ieee80211_sub_if_data *sdata)
{
	bool ps_allowed = ieee80211_powersave_allowed(sdata);

	if (sdata->vif.bss_conf.ps != ps_allowed) {
		sdata->vif.bss_conf.ps = ps_allowed;
		ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_PS);
	}
}

1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335
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,
1336
					IEEE80211_MAX_QUEUE_MAP,
1337 1338 1339 1340 1341 1342 1343 1344 1345
					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;
1346
	struct ieee80211_if_managed *ifmgd;
1347 1348
	unsigned long flags;
	int q;
1349 1350 1351 1352 1353

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

1354 1355
	ifmgd = &sdata->u.mgd;

1356 1357 1358
	if (local->hw.conf.flags & IEEE80211_CONF_PS)
		return;

1359
	if (local->hw.conf.dynamic_ps_timeout > 0) {
1360 1361
		/* don't enter PS if TX frames are pending */
		if (drv_tx_frames_pending(local)) {
1362 1363 1364 1365 1366
			mod_timer(&local->dynamic_ps_timer, jiffies +
				  msecs_to_jiffies(
				  local->hw.conf.dynamic_ps_timeout));
			return;
		}
1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384

		/*
		 * transmission can be stopped by others which leads to
		 * dynamic_ps_timer expiry. Postpone the ps timer if it
		 * is not the actual idle state.
		 */
		spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
		for (q = 0; q < local->hw.queues; q++) {
			if (local->queue_stop_reasons[q]) {
				spin_unlock_irqrestore(&local->queue_stop_reason_lock,
						       flags);
				mod_timer(&local->dynamic_ps_timer, jiffies +
					  msecs_to_jiffies(
					  local->hw.conf.dynamic_ps_timeout));
				return;
			}
		}
		spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1385 1386
	}

1387
	if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
1388
	    !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1389
		if (drv_tx_frames_pending(local)) {
1390 1391 1392
			mod_timer(&local->dynamic_ps_timer, jiffies +
				  msecs_to_jiffies(
				  local->hw.conf.dynamic_ps_timeout));
1393
		} else {
1394 1395
			ieee80211_send_nullfunc(local, sdata, 1);
			/* Flush to get the tx status of nullfunc frame */
1396
			ieee80211_flush_queues(local, sdata);
1397
		}
1398 1399
	}

1400 1401
	if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
	      (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
1402 1403 1404 1405 1406
	    (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
		ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
		local->hw.conf.flags |= IEEE80211_CONF_PS;
		ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
	}
1407 1408 1409 1410 1411 1412
}

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

1413
	if (local->quiescing || local->suspended)
1414 1415
		return;

1416
	ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1417 1418
}

1419 1420 1421 1422 1423 1424 1425
void ieee80211_dfs_cac_timer_work(struct work_struct *work)
{
	struct delayed_work *delayed_work =
		container_of(work, struct delayed_work, work);
	struct ieee80211_sub_if_data *sdata =
		container_of(delayed_work, struct ieee80211_sub_if_data,
			     dfs_cac_timer_work);
1426
	struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;
1427

1428 1429 1430 1431 1432 1433 1434 1435
	mutex_lock(&sdata->local->mtx);
	if (sdata->wdev.cac_started) {
		ieee80211_vif_release_channel(sdata);
		cfg80211_cac_event(sdata->dev, &chandef,
				   NL80211_RADAR_CAC_FINISHED,
				   GFP_KERNEL);
	}
	mutex_unlock(&sdata->local->mtx);
1436 1437
}

J
Johannes Berg 已提交
1438
/* MLME */
1439
static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1440
				     struct ieee80211_sub_if_data *sdata,
J
Johannes Berg 已提交
1441
				     const u8 *wmm_param, size_t wmm_param_len)
1442 1443
{
	struct ieee80211_tx_queue_params params;
1444
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1445 1446
	size_t left;
	int count;
J
Johannes Berg 已提交
1447 1448
	const u8 *pos;
	u8 uapsd_queues = 0;
1449

1450
	if (!local->ops->conf_tx)
1451
		return false;
1452

J
Johannes Berg 已提交
1453
	if (local->hw.queues < IEEE80211_NUM_ACS)
1454
		return false;
1455 1456

	if (!wmm_param)
1457
		return false;
1458

1459
	if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1460
		return false;
K
Kalle Valo 已提交
1461 1462

	if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1463
		uapsd_queues = ifmgd->uapsd_queues;
K
Kalle Valo 已提交
1464

1465
	count = wmm_param[6] & 0x0f;
1466
	if (count == ifmgd->wmm_last_param_set)
1467
		return false;
1468
	ifmgd->wmm_last_param_set = count;
1469 1470 1471 1472 1473 1474

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

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

Y
Yoni Divinsky 已提交
1475
	sdata->wmm_acm = 0;
1476 1477 1478
	for (; left >= 4; left -= 4, pos += 4) {
		int aci = (pos[0] >> 5) & 0x03;
		int acm = (pos[0] >> 4) & 0x01;
K
Kalle Valo 已提交
1479
		bool uapsd = false;
1480 1481 1482
		int queue;

		switch (aci) {
1483
		case 1: /* AC_BK */
J
Johannes Berg 已提交
1484
			queue = 3;
J
Johannes Berg 已提交
1485
			if (acm)
Y
Yoni Divinsky 已提交
1486
				sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
K
Kalle Valo 已提交
1487 1488
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
				uapsd = true;
1489
			break;
1490
		case 2: /* AC_VI */
J
Johannes Berg 已提交
1491
			queue = 1;
J
Johannes Berg 已提交
1492
			if (acm)
Y
Yoni Divinsky 已提交
1493
				sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
K
Kalle Valo 已提交
1494 1495
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
				uapsd = true;
1496
			break;
1497
		case 3: /* AC_VO */
J
Johannes Berg 已提交
1498
			queue = 0;
J
Johannes Berg 已提交
1499
			if (acm)
Y
Yoni Divinsky 已提交
1500
				sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
K
Kalle Valo 已提交
1501 1502
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
				uapsd = true;
1503
			break;
1504
		case 0: /* AC_BE */
1505
		default:
J
Johannes Berg 已提交
1506
			queue = 2;
J
Johannes Berg 已提交
1507
			if (acm)
Y
Yoni Divinsky 已提交
1508
				sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
K
Kalle Valo 已提交
1509 1510
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
				uapsd = true;
1511 1512 1513 1514 1515 1516
			break;
		}

		params.aifs = pos[0] & 0x0f;
		params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
		params.cw_min = ecw2cw(pos[1] & 0x0f);
1517
		params.txop = get_unaligned_le16(pos + 2);
1518
		params.acm = acm;
K
Kalle Valo 已提交
1519 1520
		params.uapsd = uapsd;

J
Johannes Berg 已提交
1521 1522 1523 1524 1525
		mlme_dbg(sdata,
			 "WMM queue=%d aci=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
			 queue, aci, acm,
			 params.aifs, params.cw_min, params.cw_max,
			 params.txop, params.uapsd);
1526 1527
		sdata->tx_conf[queue] = params;
		if (drv_conf_tx(local, sdata, queue, &params))
J
Johannes Berg 已提交
1528 1529 1530
			sdata_err(sdata,
				  "failed to set TX queue parameters for queue %d\n",
				  queue);
1531
	}
1532 1533

	/* enable WMM or activate new settings */
1534
	sdata->vif.bss_conf.qos = true;
1535
	return true;
1536 1537
}

1538 1539 1540 1541
static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
{
	lockdep_assert_held(&sdata->local->mtx);

1542
	sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1543 1544 1545 1546 1547 1548 1549 1550 1551 1552
	ieee80211_run_deferred_scan(sdata->local);
}

static void ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
{
	mutex_lock(&sdata->local->mtx);
	__ieee80211_stop_poll(sdata);
	mutex_unlock(&sdata->local->mtx);
}

J
Johannes Berg 已提交
1553 1554
static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
					   u16 capab, bool erp_valid, u8 erp)
1555
{
J
Johannes Berg 已提交
1556
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1557
	u32 changed = 0;
J
Johannes Berg 已提交
1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570
	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);
J
Johannes Berg 已提交
1571
	if (ieee80211_get_sdata_band(sdata) == IEEE80211_BAND_5GHZ)
1572
		use_short_slot = true;
1573

1574 1575 1576
	if (use_protection != bss_conf->use_cts_prot) {
		bss_conf->use_cts_prot = use_protection;
		changed |= BSS_CHANGED_ERP_CTS_PROT;
1577
	}
1578

1579 1580
	if (use_short_preamble != bss_conf->use_short_preamble) {
		bss_conf->use_short_preamble = use_short_preamble;
1581
		changed |= BSS_CHANGED_ERP_PREAMBLE;
1582
	}
1583

J
Johannes Berg 已提交
1584 1585 1586
	if (use_short_slot != bss_conf->use_short_slot) {
		bss_conf->use_short_slot = use_short_slot;
		changed |= BSS_CHANGED_ERP_SLOT;
1587 1588 1589 1590 1591
	}

	return changed;
}

1592
static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1593
				     struct cfg80211_bss *cbss,
J
Johannes Berg 已提交
1594
				     u32 bss_info_changed)
1595
{
1596
	struct ieee80211_bss *bss = (void *)cbss->priv;
1597
	struct ieee80211_local *local = sdata->local;
1598
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1599

J
Johannes Berg 已提交
1600
	bss_info_changed |= BSS_CHANGED_ASSOC;
1601
	bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1602
		bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1603

1604
	sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1605
		beacon_loss_count * bss_conf->beacon_int));
1606

1607 1608
	sdata->u.mgd.associated = cbss;
	memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1609

1610 1611
	sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;

1612
	if (sdata->vif.p2p) {
1613
		const struct cfg80211_bss_ies *ies;
1614

1615 1616 1617 1618 1619 1620 1621 1622
		rcu_read_lock();
		ies = rcu_dereference(cbss->ies);
		if (ies) {
			int ret;

			ret = cfg80211_get_p2p_attr(
					ies->data, ies->len,
					IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
J
Janusz Dziedzic 已提交
1623 1624
					(u8 *) &bss_conf->p2p_noa_attr,
					sizeof(bss_conf->p2p_noa_attr));
1625
			if (ret >= 2) {
J
Janusz Dziedzic 已提交
1626 1627
				sdata->u.mgd.p2p_noa_index =
					bss_conf->p2p_noa_attr.index;
1628 1629
				bss_info_changed |= BSS_CHANGED_P2P_PS;
			}
1630
		}
1631
		rcu_read_unlock();
1632 1633
	}

J
Johannes Berg 已提交
1634
	/* just to be sure */
1635
	ieee80211_stop_poll(sdata);
J
Johannes Berg 已提交
1636

1637
	ieee80211_led_assoc(local, 1);
1638

1639
	if (sdata->u.mgd.have_beacon) {
1640 1641 1642 1643 1644 1645 1646
		/*
		 * If the AP is buggy we may get here with no DTIM period
		 * known, so assume it's 1 which is the only safe assumption
		 * in that case, although if the TIM IE is broken powersave
		 * probably just won't work at all.
		 */
		bss_conf->dtim_period = sdata->u.mgd.dtim_period ?: 1;
1647
		bss_conf->beacon_rate = bss->beacon_rate;
1648
		bss_info_changed |= BSS_CHANGED_BEACON_INFO;
1649
	} else {
1650
		bss_conf->beacon_rate = NULL;
1651
		bss_conf->dtim_period = 0;
1652
	}
1653

1654
	bss_conf->assoc = 1;
1655

1656
	/* Tell the driver to monitor connection quality (if supported) */
1657
	if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1658
	    bss_conf->cqm_rssi_thold)
1659 1660
		bss_info_changed |= BSS_CHANGED_CQM;

1661
	/* Enable ARP filtering */
1662
	if (bss_conf->arp_addr_cnt)
1663 1664
		bss_info_changed |= BSS_CHANGED_ARP_FILTER;

J
Johannes Berg 已提交
1665
	ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1666

J
Johannes Berg 已提交
1667 1668 1669
	mutex_lock(&local->iflist_mtx);
	ieee80211_recalc_ps(local, -1);
	mutex_unlock(&local->iflist_mtx);
1670

1671
	ieee80211_recalc_smps(sdata);
E
Eliad Peller 已提交
1672 1673
	ieee80211_recalc_ps_vif(sdata);

1674
	netif_carrier_on(sdata->dev);
1675 1676
}

1677
static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1678 1679
				   u16 stype, u16 reason, bool tx,
				   u8 *frame_buf)
1680
{
1681
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1682
	struct ieee80211_local *local = sdata->local;
1683
	u32 changed = 0;
1684

1685
	sdata_assert_lock(sdata);
1686

1687 1688 1689
	if (WARN_ON_ONCE(tx && !frame_buf))
		return;

J
Johannes Berg 已提交
1690 1691 1692
	if (WARN_ON(!ifmgd->associated))
		return;

1693 1694
	ieee80211_stop_poll(sdata);

1695
	ifmgd->associated = NULL;
1696 1697
	netif_carrier_off(sdata->dev);

1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708
	/*
	 * if we want to get out of ps before disassoc (why?) we have
	 * to do it before sending disassoc, as otherwise the null-packet
	 * won't be valid.
	 */
	if (local->hw.conf.flags & IEEE80211_CONF_PS) {
		local->hw.conf.flags &= ~IEEE80211_CONF_PS;
		ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
	}
	local->ps_sdata = NULL;

E
Eliad Peller 已提交
1709 1710 1711
	/* disable per-vif ps */
	ieee80211_recalc_ps_vif(sdata);

1712 1713
	/* flush out any pending frame (e.g. DELBA) before deauth/disassoc */
	if (tx)
1714
		ieee80211_flush_queues(local, sdata);
1715

1716 1717
	/* deauthenticate/disassociate now */
	if (tx || frame_buf)
1718 1719
		ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
					       reason, tx, frame_buf);
1720 1721 1722

	/* flush out frame */
	if (tx)
1723
		ieee80211_flush_queues(local, sdata);
1724

1725 1726 1727
	/* clear bssid only after building the needed mgmt frames */
	memset(ifmgd->bssid, 0, ETH_ALEN);

1728
	/* remove AP and TDLS peers */
1729
	sta_info_flush(sdata);
1730 1731

	/* finally reset all BSS / config parameters */
1732 1733 1734
	changed |= ieee80211_reset_erp_info(sdata);

	ieee80211_led_assoc(local, 0);
J
Johannes Berg 已提交
1735 1736
	changed |= BSS_CHANGED_ASSOC;
	sdata->vif.bss_conf.assoc = false;
1737

J
Janusz Dziedzic 已提交
1738 1739 1740
	ifmgd->p2p_noa_index = -1;
	memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
	       sizeof(sdata->vif.bss_conf.p2p_noa_attr));
1741

1742
	/* on the next assoc, re-program HT/VHT parameters */
B
Ben Greear 已提交
1743 1744
	memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
	memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
1745 1746
	memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
	memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
1747

1748
	sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1749

1750 1751 1752
	del_timer_sync(&local->dynamic_ps_timer);
	cancel_work_sync(&local->dynamic_ps_enable_work);

1753
	/* Disable ARP filtering */
1754
	if (sdata->vif.bss_conf.arp_addr_cnt)
1755 1756
		changed |= BSS_CHANGED_ARP_FILTER;

1757 1758 1759
	sdata->vif.bss_conf.qos = false;
	changed |= BSS_CHANGED_QOS;

1760 1761
	/* The BSSID (not really interesting) and HT changed */
	changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
J
Johannes Berg 已提交
1762
	ieee80211_bss_info_change_notify(sdata, changed);
1763

1764 1765 1766
	/* disassociated - set to defaults now */
	ieee80211_set_wmm_default(sdata, false);

1767 1768 1769 1770
	del_timer_sync(&sdata->u.mgd.conn_mon_timer);
	del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
	del_timer_sync(&sdata->u.mgd.timer);
	del_timer_sync(&sdata->u.mgd.chswitch_timer);
1771

1772
	sdata->vif.bss_conf.dtim_period = 0;
1773 1774
	sdata->vif.bss_conf.beacon_rate = NULL;

1775
	ifmgd->have_beacon = false;
1776

1777
	ifmgd->flags = 0;
1778
	mutex_lock(&local->mtx);
1779
	ieee80211_vif_release_channel(sdata);
1780
	mutex_unlock(&local->mtx);
1781 1782

	sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1783
}
1784

1785 1786 1787 1788 1789 1790 1791 1792
void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
			     struct ieee80211_hdr *hdr)
{
	/*
	 * We can postpone the mgd.timer whenever receiving unicast frames
	 * from AP because we know that the connection is working both ways
	 * at that time. But multicast frames (and hence also beacons) must
	 * be ignored here, because we need to trigger the timer during
J
Johannes Berg 已提交
1793 1794
	 * data idle periods for sending the periodic probe request to the
	 * AP we're connected to.
1795
	 */
J
Johannes Berg 已提交
1796 1797 1798
	if (is_multicast_ether_addr(hdr->addr1))
		return;

1799
	ieee80211_sta_reset_conn_monitor(sdata);
1800
}
1801

1802 1803 1804
static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1805
	struct ieee80211_local *local = sdata->local;
1806

1807
	mutex_lock(&local->mtx);
1808 1809
	if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
		goto out;
1810

1811
	__ieee80211_stop_poll(sdata);
1812 1813 1814 1815

	mutex_lock(&local->iflist_mtx);
	ieee80211_recalc_ps(local, -1);
	mutex_unlock(&local->iflist_mtx);
1816 1817

	if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1818
		goto out;
1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829

	/*
	 * We've received a probe response, but are not sure whether
	 * we have or will be receiving any beacons or data, so let's
	 * schedule the timers again, just in case.
	 */
	ieee80211_sta_reset_beacon_monitor(sdata);

	mod_timer(&ifmgd->conn_mon_timer,
		  round_jiffies_up(jiffies +
				   IEEE80211_CONNECTION_IDLE_TIME));
1830 1831
out:
	mutex_unlock(&local->mtx);
1832 1833 1834
}

void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1835
			     struct ieee80211_hdr *hdr, bool ack)
1836
{
F
Felix Fietkau 已提交
1837
	if (!ieee80211_is_data(hdr->frame_control))
1838 1839 1840 1841
	    return;

	if (ieee80211_is_nullfunc(hdr->frame_control) &&
	    sdata->u.mgd.probe_send_count > 0) {
1842
		if (ack)
1843
			ieee80211_sta_reset_conn_monitor(sdata);
1844 1845
		else
			sdata->u.mgd.nullfunc_failed = true;
1846
		ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1847
		return;
1848
	}
1849 1850 1851

	if (ack)
		ieee80211_sta_reset_conn_monitor(sdata);
1852 1853
}

1854 1855 1856 1857
static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	const u8 *ssid;
1858
	u8 *dst = ifmgd->associated->bssid;
1859
	u8 unicast_limit = max(1, max_probe_tries - 3);
1860 1861 1862 1863 1864 1865 1866 1867

	/*
	 * Try sending broadcast probe requests for the last three
	 * probe requests after the first ones failed since some
	 * buggy APs only support broadcast probe requests.
	 */
	if (ifmgd->probe_send_count >= unicast_limit)
		dst = NULL;
1868

1869 1870 1871 1872 1873 1874 1875
	/*
	 * When the hardware reports an accurate Tx ACK status, it's
	 * better to send a nullfunc frame instead of a probe request,
	 * as it will kick us off the AP quickly if we aren't associated
	 * anymore. The timeout will be reset if the frame is ACKed by
	 * the AP.
	 */
1876 1877
	ifmgd->probe_send_count++;

1878 1879
	if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
		ifmgd->nullfunc_failed = false;
1880
		ieee80211_send_nullfunc(sdata->local, sdata, 0);
1881
	} else {
1882 1883
		int ssid_len;

1884
		rcu_read_lock();
1885
		ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1886 1887 1888 1889 1890 1891
		if (WARN_ON_ONCE(ssid == NULL))
			ssid_len = 0;
		else
			ssid_len = ssid[1];

		ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid_len, NULL,
1892
					 0, (u32) -1, true, 0,
J
Johannes Berg 已提交
1893
					 ifmgd->associated->channel, false);
1894
		rcu_read_unlock();
1895
	}
1896

1897
	ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1898
	run_again(sdata, ifmgd->probe_timeout);
1899
	if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
1900
		ieee80211_flush_queues(sdata->local, sdata);
1901 1902
}

J
Johannes Berg 已提交
1903 1904
static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
				   bool beacon)
1905 1906
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
J
Johannes Berg 已提交
1907
	bool already = false;
1908

1909
	if (!ieee80211_sdata_running(sdata))
1910 1911
		return;

1912
	sdata_lock(sdata);
1913 1914 1915 1916

	if (!ifmgd->associated)
		goto out;

1917 1918 1919 1920 1921 1922 1923
	mutex_lock(&sdata->local->mtx);

	if (sdata->local->tmp_channel || sdata->local->scanning) {
		mutex_unlock(&sdata->local->mtx);
		goto out;
	}

1924
	if (beacon) {
J
Johannes Berg 已提交
1925
		mlme_dbg_ratelimited(sdata,
1926 1927
				     "detected beacon loss from AP (missed %d beacons) - probing\n",
				     beacon_loss_count);
J
Johannes Berg 已提交
1928

1929 1930 1931 1932
		ieee80211_cqm_rssi_notify(&sdata->vif,
					  NL80211_CQM_RSSI_BEACON_LOSS_EVENT,
					  GFP_KERNEL);
	}
1933

J
Johannes Berg 已提交
1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944
	/*
	 * The driver/our work has already reported this event or the
	 * connection monitoring has kicked in and we have already sent
	 * a probe request. Or maybe the AP died and the driver keeps
	 * reporting until we disassociate...
	 *
	 * In either case we have to ignore the current call to this
	 * function (except for setting the correct probe reason bit)
	 * because otherwise we would reset the timer every time and
	 * never check whether we received a probe response!
	 */
1945
	if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
J
Johannes Berg 已提交
1946 1947
		already = true;

E
Eliad Peller 已提交
1948 1949
	ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;

1950 1951
	mutex_unlock(&sdata->local->mtx);

J
Johannes Berg 已提交
1952 1953 1954
	if (already)
		goto out;

1955 1956 1957 1958
	mutex_lock(&sdata->local->iflist_mtx);
	ieee80211_recalc_ps(sdata->local, -1);
	mutex_unlock(&sdata->local->iflist_mtx);

1959 1960
	ifmgd->probe_send_count = 0;
	ieee80211_mgd_probe_ap_send(sdata);
1961
 out:
1962
	sdata_unlock(sdata);
1963 1964
}

1965 1966 1967 1968 1969
struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
					  struct ieee80211_vif *vif)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1970
	struct cfg80211_bss *cbss;
1971 1972
	struct sk_buff *skb;
	const u8 *ssid;
1973
	int ssid_len;
1974 1975 1976 1977

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

1978
	sdata_assert_lock(sdata);
1979

1980 1981 1982 1983 1984 1985 1986
	if (ifmgd->associated)
		cbss = ifmgd->associated;
	else if (ifmgd->auth_data)
		cbss = ifmgd->auth_data->bss;
	else if (ifmgd->assoc_data)
		cbss = ifmgd->assoc_data->bss;
	else
1987 1988
		return NULL;

1989
	rcu_read_lock();
1990
	ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
1991 1992 1993 1994 1995
	if (WARN_ON_ONCE(ssid == NULL))
		ssid_len = 0;
	else
		ssid_len = ssid[1];

1996
	skb = ieee80211_build_probe_req(sdata, cbss->bssid,
J
Johannes Berg 已提交
1997
					(u32) -1, cbss->channel,
1998
					ssid + 2, ssid_len,
1999
					NULL, 0, true);
2000
	rcu_read_unlock();
2001 2002 2003 2004 2005

	return skb;
}
EXPORT_SYMBOL(ieee80211_ap_probereq_get);

2006
static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2007 2008
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2009
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2010

2011
	sdata_lock(sdata);
2012
	if (!ifmgd->associated) {
2013
		sdata_unlock(sdata);
2014 2015 2016
		return;
	}

2017 2018
	ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
			       WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2019
			       true, frame_buf);
2020
	ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
2021
	sdata->vif.csa_active = false;
2022
	ieee80211_wake_queues_by_reason(&sdata->local->hw,
2023
					IEEE80211_MAX_QUEUE_MAP,
2024
					IEEE80211_QUEUE_STOP_REASON_CSA);
2025

2026 2027
	cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
			      IEEE80211_DEAUTH_FRAME_LEN);
2028
	sdata_unlock(sdata);
2029 2030
}

2031
static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
J
Johannes Berg 已提交
2032 2033 2034
{
	struct ieee80211_sub_if_data *sdata =
		container_of(work, struct ieee80211_sub_if_data,
2035
			     u.mgd.beacon_connection_loss_work);
2036 2037 2038 2039
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	struct sta_info *sta;

	if (ifmgd->associated) {
2040
		rcu_read_lock();
2041 2042 2043
		sta = sta_info_get(sdata, ifmgd->bssid);
		if (sta)
			sta->beacon_loss_count++;
2044
		rcu_read_unlock();
2045
	}
J
Johannes Berg 已提交
2046

2047
	if (ifmgd->connection_loss) {
2048 2049
		sdata_info(sdata, "Connection to AP %pM lost\n",
			   ifmgd->bssid);
2050
		__ieee80211_disconnect(sdata);
2051
	} else {
2052
		ieee80211_mgd_probe_ap(sdata, true);
2053 2054 2055 2056 2057 2058 2059 2060 2061
	}
}

static void ieee80211_csa_connection_drop_work(struct work_struct *work)
{
	struct ieee80211_sub_if_data *sdata =
		container_of(work, struct ieee80211_sub_if_data,
			     u.mgd.csa_connection_drop_work);

2062
	__ieee80211_disconnect(sdata);
J
Johannes Berg 已提交
2063 2064
}

2065 2066 2067
void ieee80211_beacon_loss(struct ieee80211_vif *vif)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2068
	struct ieee80211_hw *hw = &sdata->local->hw;
2069

J
Johannes Berg 已提交
2070 2071
	trace_api_beacon_loss(sdata);

2072
	sdata->u.mgd.connection_loss = false;
2073
	ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2074 2075 2076
}
EXPORT_SYMBOL(ieee80211_beacon_loss);

2077 2078 2079 2080 2081
void ieee80211_connection_loss(struct ieee80211_vif *vif)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
	struct ieee80211_hw *hw = &sdata->local->hw;

J
Johannes Berg 已提交
2082 2083
	trace_api_connection_loss(sdata);

2084
	sdata->u.mgd.connection_loss = true;
2085 2086 2087 2088 2089
	ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
}
EXPORT_SYMBOL(ieee80211_connection_loss);


J
Johannes Berg 已提交
2090 2091 2092 2093 2094
static void ieee80211_destroy_auth_data(struct ieee80211_sub_if_data *sdata,
					bool assoc)
{
	struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;

2095
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
2096 2097 2098 2099 2100 2101

	if (!assoc) {
		sta_info_destroy_addr(sdata, auth_data->bss->bssid);

		memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
		ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2102
		sdata->u.mgd.flags = 0;
2103
		mutex_lock(&sdata->local->mtx);
J
Johannes Berg 已提交
2104
		ieee80211_vif_release_channel(sdata);
2105
		mutex_unlock(&sdata->local->mtx);
J
Johannes Berg 已提交
2106 2107
	}

2108
	cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
J
Johannes Berg 已提交
2109 2110 2111 2112 2113 2114 2115
	kfree(auth_data);
	sdata->u.mgd.auth_data = NULL;
}

static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
				     struct ieee80211_mgmt *mgmt, size_t len)
{
2116
	struct ieee80211_local *local = sdata->local;
J
Johannes Berg 已提交
2117 2118 2119
	struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
	u8 *pos;
	struct ieee802_11_elems elems;
2120
	u32 tx_flags = 0;
J
Johannes Berg 已提交
2121 2122

	pos = mgmt->u.auth.variable;
2123
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
J
Johannes Berg 已提交
2124 2125 2126
	if (!elems.challenge)
		return;
	auth_data->expected_transaction = 4;
J
Johannes Berg 已提交
2127
	drv_mgd_prepare_tx(sdata->local, sdata);
2128 2129 2130
	if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
		tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
			   IEEE80211_TX_INTFL_MLME_CONN_TX;
2131
	ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
J
Johannes Berg 已提交
2132 2133 2134
			    elems.challenge - 2, elems.challenge_len + 2,
			    auth_data->bss->bssid, auth_data->bss->bssid,
			    auth_data->key, auth_data->key_len,
2135
			    auth_data->key_idx, tx_flags);
J
Johannes Berg 已提交
2136 2137
}

2138 2139
static void ieee80211_rx_mgmt_auth(struct ieee80211_sub_if_data *sdata,
				   struct ieee80211_mgmt *mgmt, size_t len)
J
Johannes Berg 已提交
2140 2141 2142 2143 2144 2145
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	u8 bssid[ETH_ALEN];
	u16 auth_alg, auth_transaction, status_code;
	struct sta_info *sta;

2146
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
2147 2148

	if (len < 24 + 6)
2149
		return;
J
Johannes Berg 已提交
2150 2151

	if (!ifmgd->auth_data || ifmgd->auth_data->done)
2152
		return;
J
Johannes Berg 已提交
2153 2154 2155

	memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);

2156
	if (!ether_addr_equal(bssid, mgmt->bssid))
2157
		return;
J
Johannes Berg 已提交
2158 2159 2160 2161 2162 2163

	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);

	if (auth_alg != ifmgd->auth_data->algorithm ||
2164 2165 2166 2167 2168
	    auth_transaction != ifmgd->auth_data->expected_transaction) {
		sdata_info(sdata, "%pM unexpected authentication state: alg %d (expected %d) transact %d (expected %d)\n",
			   mgmt->sa, auth_alg, ifmgd->auth_data->algorithm,
			   auth_transaction,
			   ifmgd->auth_data->expected_transaction);
2169
		return;
2170
	}
J
Johannes Berg 已提交
2171 2172

	if (status_code != WLAN_STATUS_SUCCESS) {
J
Johannes Berg 已提交
2173 2174
		sdata_info(sdata, "%pM denied authentication (status %d)\n",
			   mgmt->sa, status_code);
2175
		ieee80211_destroy_auth_data(sdata, false);
2176
		cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2177
		return;
J
Johannes Berg 已提交
2178 2179 2180 2181 2182 2183
	}

	switch (ifmgd->auth_data->algorithm) {
	case WLAN_AUTH_OPEN:
	case WLAN_AUTH_LEAP:
	case WLAN_AUTH_FT:
2184
	case WLAN_AUTH_SAE:
J
Johannes Berg 已提交
2185 2186 2187 2188 2189
		break;
	case WLAN_AUTH_SHARED_KEY:
		if (ifmgd->auth_data->expected_transaction != 4) {
			ieee80211_auth_challenge(sdata, mgmt, len);
			/* need another frame */
2190
			return;
J
Johannes Berg 已提交
2191 2192 2193 2194 2195
		}
		break;
	default:
		WARN_ONCE(1, "invalid auth alg %d",
			  ifmgd->auth_data->algorithm);
2196
		return;
J
Johannes Berg 已提交
2197 2198
	}

J
Johannes Berg 已提交
2199
	sdata_info(sdata, "authenticated\n");
J
Johannes Berg 已提交
2200 2201
	ifmgd->auth_data->done = true;
	ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2202
	ifmgd->auth_data->timeout_started = true;
2203
	run_again(sdata, ifmgd->auth_data->timeout);
J
Johannes Berg 已提交
2204

2205 2206 2207 2208 2209 2210
	if (ifmgd->auth_data->algorithm == WLAN_AUTH_SAE &&
	    ifmgd->auth_data->expected_transaction != 2) {
		/*
		 * Report auth frame to user space for processing since another
		 * round of Authentication frames is still needed.
		 */
2211
		cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2212
		return;
2213 2214
	}

J
Johannes Berg 已提交
2215 2216 2217 2218 2219 2220 2221 2222
	/* move station state to auth */
	mutex_lock(&sdata->local->sta_mtx);
	sta = sta_info_get(sdata, bssid);
	if (!sta) {
		WARN_ONCE(1, "%s: STA %pM not found", sdata->name, bssid);
		goto out_err;
	}
	if (sta_info_move_state(sta, IEEE80211_STA_AUTH)) {
J
Johannes Berg 已提交
2223
		sdata_info(sdata, "failed moving %pM to auth\n", bssid);
J
Johannes Berg 已提交
2224 2225 2226 2227
		goto out_err;
	}
	mutex_unlock(&sdata->local->sta_mtx);

2228
	cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2229
	return;
J
Johannes Berg 已提交
2230 2231 2232 2233 2234 2235
 out_err:
	mutex_unlock(&sdata->local->sta_mtx);
	/* ignore frame -- wait for timeout */
}


2236 2237
static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
				     struct ieee80211_mgmt *mgmt, size_t len)
2238
{
2239
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2240
	const u8 *bssid = NULL;
2241 2242
	u16 reason_code;

2243
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
2244

2245
	if (len < 24 + 2)
2246
		return;
2247

J
Johannes Berg 已提交
2248
	if (!ifmgd->associated ||
2249
	    !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2250
		return;
2251

2252
	bssid = ifmgd->associated->bssid;
2253 2254 2255

	reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);

J
Johannes Berg 已提交
2256 2257
	sdata_info(sdata, "deauthenticated from %pM (Reason: %u)\n",
		   bssid, reason_code);
2258

2259 2260
	ieee80211_set_disassoc(sdata, 0, 0, false, NULL);

2261
	cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2262 2263 2264
}


2265 2266
static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
				       struct ieee80211_mgmt *mgmt, size_t len)
2267
{
2268
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2269 2270
	u16 reason_code;

2271
	sdata_assert_lock(sdata);
2272

J
Johannes Berg 已提交
2273
	if (len < 24 + 2)
2274
		return;
2275

J
Johannes Berg 已提交
2276
	if (!ifmgd->associated ||
2277
	    !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2278
		return;
2279 2280 2281

	reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);

J
Johannes Berg 已提交
2282 2283
	sdata_info(sdata, "disassociated from %pM (Reason: %u)\n",
		   mgmt->sa, reason_code);
2284

2285 2286
	ieee80211_set_disassoc(sdata, 0, 0, false, NULL);

2287
	cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2288 2289
}

2290 2291 2292 2293
static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
				u8 *supp_rates, unsigned int supp_rates_len,
				u32 *rates, u32 *basic_rates,
				bool *have_higher_than_11mbit,
2294 2295
				int *min_rate, int *min_rate_index,
				int shift, u32 rate_flags)
2296 2297 2298 2299
{
	int i, j;

	for (i = 0; i < supp_rates_len; i++) {
2300
		int rate = supp_rates[i] & 0x7f;
2301 2302
		bool is_basic = !!(supp_rates[i] & 0x80);

2303
		if ((rate * 5 * (1 << shift)) > 110)
2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318
			*have_higher_than_11mbit = true;

		/*
		 * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
		 * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
		 *
		 * Note: Even through the membership selector and the basic
		 *	 rate flag share the same bit, they are not exactly
		 *	 the same.
		 */
		if (!!(supp_rates[i] & 0x80) &&
		    (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
			continue;

		for (j = 0; j < sband->n_bitrates; j++) {
2319 2320 2321 2322 2323 2324 2325 2326 2327
			struct ieee80211_rate *br;
			int brate;

			br = &sband->bitrates[j];
			if ((rate_flags & br->flags) != rate_flags)
				continue;

			brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
			if (brate == rate) {
2328 2329 2330
				*rates |= BIT(j);
				if (is_basic)
					*basic_rates |= BIT(j);
2331 2332
				if ((rate * 5) < *min_rate) {
					*min_rate = rate * 5;
2333 2334 2335 2336 2337 2338 2339
					*min_rate_index = j;
				}
				break;
			}
		}
	}
}
2340

J
Johannes Berg 已提交
2341 2342 2343 2344 2345
static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
					 bool assoc)
{
	struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;

2346
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
2347 2348 2349 2350 2351 2352

	if (!assoc) {
		sta_info_destroy_addr(sdata, assoc_data->bss->bssid);

		memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
		ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2353
		sdata->u.mgd.flags = 0;
2354
		mutex_lock(&sdata->local->mtx);
J
Johannes Berg 已提交
2355
		ieee80211_vif_release_channel(sdata);
2356
		mutex_unlock(&sdata->local->mtx);
J
Johannes Berg 已提交
2357 2358 2359 2360 2361 2362 2363 2364
	}

	kfree(assoc_data);
	sdata->u.mgd.assoc_data = NULL;
}

static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
				    struct cfg80211_bss *cbss,
J
Johannes Berg 已提交
2365
				    struct ieee80211_mgmt *mgmt, size_t len)
2366
{
2367
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2368
	struct ieee80211_local *local = sdata->local;
2369
	struct ieee80211_supported_band *sband;
2370
	struct sta_info *sta;
J
Johannes Berg 已提交
2371 2372
	u8 *pos;
	u16 capab_info, aid;
2373
	struct ieee802_11_elems elems;
J
Johannes Berg 已提交
2374
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2375 2376
	const struct cfg80211_bss_ies *bss_ies = NULL;
	struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
J
Johannes Berg 已提交
2377
	u32 changed = 0;
2378
	int err;
2379
	bool ret;
2380

J
Johannes Berg 已提交
2381
	/* AssocResp and ReassocResp have identical structure */
2382 2383

	aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
J
Johannes Berg 已提交
2384
	capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2385

2386
	if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
J
Johannes Berg 已提交
2387 2388
		sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
			   aid);
2389 2390
	aid &= ~(BIT(15) | BIT(14));

2391 2392 2393
	ifmgd->broken_ap = false;

	if (aid == 0 || aid > IEEE80211_MAX_AID) {
J
Johannes Berg 已提交
2394 2395
		sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
			   aid);
2396 2397 2398 2399
		aid = 0;
		ifmgd->broken_ap = true;
	}

J
Johannes Berg 已提交
2400
	pos = mgmt->u.assoc_resp.variable;
2401
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
J
Johannes Berg 已提交
2402

2403
	if (!elems.supp_rates) {
J
Johannes Berg 已提交
2404
		sdata_info(sdata, "no SuppRates element in AssocResp\n");
J
Johannes Berg 已提交
2405
		return false;
2406 2407
	}

2408
	ifmgd->aid = aid;
2409

2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472
	/*
	 * Some APs are erroneously not including some information in their
	 * (re)association response frames. Try to recover by using the data
	 * from the beacon or probe response. This seems to afflict mobile
	 * 2G/3G/4G wifi routers, reported models include the "Onda PN51T",
	 * "Vodafone PocketWiFi 2", "ZTE MF60" and a similar T-Mobile device.
	 */
	if ((assoc_data->wmm && !elems.wmm_param) ||
	    (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
	     (!elems.ht_cap_elem || !elems.ht_operation)) ||
	    (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
	     (!elems.vht_cap_elem || !elems.vht_operation))) {
		const struct cfg80211_bss_ies *ies;
		struct ieee802_11_elems bss_elems;

		rcu_read_lock();
		ies = rcu_dereference(cbss->ies);
		if (ies)
			bss_ies = kmemdup(ies, sizeof(*ies) + ies->len,
					  GFP_ATOMIC);
		rcu_read_unlock();
		if (!bss_ies)
			return false;

		ieee802_11_parse_elems(bss_ies->data, bss_ies->len,
				       false, &bss_elems);
		if (assoc_data->wmm &&
		    !elems.wmm_param && bss_elems.wmm_param) {
			elems.wmm_param = bss_elems.wmm_param;
			sdata_info(sdata,
				   "AP bug: WMM param missing from AssocResp\n");
		}

		/*
		 * Also check if we requested HT/VHT, otherwise the AP doesn't
		 * have to include the IEs in the (re)association response.
		 */
		if (!elems.ht_cap_elem && bss_elems.ht_cap_elem &&
		    !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
			elems.ht_cap_elem = bss_elems.ht_cap_elem;
			sdata_info(sdata,
				   "AP bug: HT capability missing from AssocResp\n");
		}
		if (!elems.ht_operation && bss_elems.ht_operation &&
		    !(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
			elems.ht_operation = bss_elems.ht_operation;
			sdata_info(sdata,
				   "AP bug: HT operation missing from AssocResp\n");
		}
		if (!elems.vht_cap_elem && bss_elems.vht_cap_elem &&
		    !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
			elems.vht_cap_elem = bss_elems.vht_cap_elem;
			sdata_info(sdata,
				   "AP bug: VHT capa missing from AssocResp\n");
		}
		if (!elems.vht_operation && bss_elems.vht_operation &&
		    !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)) {
			elems.vht_operation = bss_elems.vht_operation;
			sdata_info(sdata,
				   "AP bug: VHT operation missing from AssocResp\n");
		}
	}

2473 2474 2475 2476 2477 2478 2479
	/*
	 * We previously checked these in the beacon/probe response, so
	 * they should be present here. This is just a safety net.
	 */
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
	    (!elems.wmm_param || !elems.ht_cap_elem || !elems.ht_operation)) {
		sdata_info(sdata,
2480 2481 2482
			   "HT AP is missing WMM params or HT capability/operation\n");
		ret = false;
		goto out;
2483 2484 2485 2486 2487
	}

	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
	    (!elems.vht_cap_elem || !elems.vht_operation)) {
		sdata_info(sdata,
2488 2489 2490
			   "VHT AP is missing VHT capability/operation\n");
		ret = false;
		goto out;
2491 2492
	}

2493 2494 2495 2496 2497
	mutex_lock(&sdata->local->sta_mtx);
	/*
	 * station info was already allocated and inserted before
	 * the association and should be available to us
	 */
2498
	sta = sta_info_get(sdata, cbss->bssid);
2499 2500
	if (WARN_ON(!sta)) {
		mutex_unlock(&sdata->local->sta_mtx);
2501 2502
		ret = false;
		goto out;
2503
	}
2504

J
Johannes Berg 已提交
2505
	sband = local->hw.wiphy->bands[ieee80211_get_sdata_band(sdata)];
2506

2507
	/* Set up internal HT/VHT capabilities */
2508
	if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
B
Ben Greear 已提交
2509
		ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
2510
						  elems.ht_cap_elem, sta);
2511

M
Mahesh Palivela 已提交
2512 2513
	if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
		ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
2514
						    elems.vht_cap_elem, sta);
M
Mahesh Palivela 已提交
2515

2516 2517 2518 2519 2520 2521
	/*
	 * Some APs, e.g. Netgear WNDR3700, report invalid HT operation data
	 * in their association response, so ignore that data for our own
	 * configuration. If it changed since the last beacon, we'll get the
	 * next beacon and update then.
	 */
2522

2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537
	/*
	 * If an operating mode notification IE is present, override the
	 * NSS calculation (that would be done in rate_control_rate_init())
	 * and use the # of streams from that element.
	 */
	if (elems.opmode_notif &&
	    !(*elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_TYPE_BF)) {
		u8 nss;

		nss = *elems.opmode_notif & IEEE80211_OPMODE_NOTIF_RX_NSS_MASK;
		nss >>= IEEE80211_OPMODE_NOTIF_RX_NSS_SHIFT;
		nss += 1;
		sta->sta.rx_nss = nss;
	}

2538
	rate_control_rate_init(sta);
2539

2540
	if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
J
Johannes Berg 已提交
2541
		set_sta_flag(sta, WLAN_STA_MFP);
2542

2543
	if (elems.wmm_param)
J
Johannes Berg 已提交
2544
		set_sta_flag(sta, WLAN_STA_WME);
2545

2546
	err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
2547 2548 2549
	if (!err && !(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
		err = sta_info_move_state(sta, IEEE80211_STA_AUTHORIZED);
	if (err) {
J
Johannes Berg 已提交
2550 2551 2552
		sdata_info(sdata,
			   "failed to move station %pM to desired state\n",
			   sta->sta.addr);
2553 2554
		WARN_ON(__sta_info_destroy(sta));
		mutex_unlock(&sdata->local->sta_mtx);
2555 2556
		ret = false;
		goto out;
2557 2558
	}

2559
	mutex_unlock(&sdata->local->sta_mtx);
2560

2561 2562 2563 2564 2565 2566 2567 2568
	/*
	 * Always handle WMM once after association regardless
	 * of the first value the AP uses. Setting -1 here has
	 * that effect because the AP values is an unsigned
	 * 4-bit value.
	 */
	ifmgd->wmm_last_param_set = -1;

2569
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) && elems.wmm_param)
2570
		ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
J
Johannes Berg 已提交
2571
					 elems.wmm_param_len);
2572
	else
2573 2574
		ieee80211_set_wmm_default(sdata, false);
	changed |= BSS_CHANGED_QOS;
2575

J
Johannes Berg 已提交
2576 2577 2578 2579
	/* set AID and assoc capability,
	 * ieee80211_set_associated() will tell the driver */
	bss_conf->aid = aid;
	bss_conf->assoc_capability = capab_info;
2580
	ieee80211_set_associated(sdata, cbss, changed);
2581

2582 2583 2584 2585 2586 2587 2588
	/*
	 * If we're using 4-addr mode, let the AP know that we're
	 * doing so, so that it can create the STA VLAN on its side
	 */
	if (ifmgd->use_4addr)
		ieee80211_send_4addr_nullfunc(local, sdata);

2589
	/*
J
Johannes Berg 已提交
2590 2591
	 * Start timer to probe the connection to the AP now.
	 * Also start the timer that will detect beacon loss.
2592
	 */
J
Johannes Berg 已提交
2593
	ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
2594
	ieee80211_sta_reset_beacon_monitor(sdata);
2595

2596 2597 2598 2599
	ret = true;
 out:
	kfree(bss_ies);
	return ret;
2600 2601
}

2602 2603 2604
static void ieee80211_rx_mgmt_assoc_resp(struct ieee80211_sub_if_data *sdata,
					 struct ieee80211_mgmt *mgmt,
					 size_t len)
J
Johannes Berg 已提交
2605 2606 2607 2608 2609 2610 2611
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
	u16 capab_info, status_code, aid;
	struct ieee802_11_elems elems;
	u8 *pos;
	bool reassoc;
2612
	struct cfg80211_bss *bss;
J
Johannes Berg 已提交
2613

2614
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
2615 2616

	if (!assoc_data)
2617
		return;
2618
	if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
2619
		return;
J
Johannes Berg 已提交
2620 2621 2622 2623 2624 2625 2626

	/*
	 * AssocResp and ReassocResp have identical structure, so process both
	 * of them in this function.
	 */

	if (len < 24 + 6)
2627
		return;
J
Johannes Berg 已提交
2628 2629 2630 2631 2632 2633

	reassoc = ieee80211_is_reassoc_req(mgmt->frame_control);
	capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
	status_code = le16_to_cpu(mgmt->u.assoc_resp.status_code);
	aid = le16_to_cpu(mgmt->u.assoc_resp.aid);

J
Johannes Berg 已提交
2634 2635 2636 2637
	sdata_info(sdata,
		   "RX %sssocResp from %pM (capab=0x%x status=%d aid=%d)\n",
		   reassoc ? "Rea" : "A", mgmt->sa,
		   capab_info, status_code, (u16)(aid & ~(BIT(15) | BIT(14))));
J
Johannes Berg 已提交
2638 2639

	pos = mgmt->u.assoc_resp.variable;
2640
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
J
Johannes Berg 已提交
2641 2642

	if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
2643 2644
	    elems.timeout_int &&
	    elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
J
Johannes Berg 已提交
2645
		u32 tu, ms;
2646
		tu = le32_to_cpu(elems.timeout_int->value);
J
Johannes Berg 已提交
2647
		ms = tu * 1024 / 1000;
J
Johannes Berg 已提交
2648 2649 2650
		sdata_info(sdata,
			   "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
			   mgmt->sa, tu, ms);
J
Johannes Berg 已提交
2651
		assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
2652
		assoc_data->timeout_started = true;
J
Johannes Berg 已提交
2653
		if (ms > IEEE80211_ASSOC_TIMEOUT)
2654 2655
			run_again(sdata, assoc_data->timeout);
		return;
J
Johannes Berg 已提交
2656 2657
	}

2658
	bss = assoc_data->bss;
J
Johannes Berg 已提交
2659 2660

	if (status_code != WLAN_STATUS_SUCCESS) {
J
Johannes Berg 已提交
2661 2662
		sdata_info(sdata, "%pM denied association (code=%d)\n",
			   mgmt->sa, status_code);
J
Johannes Berg 已提交
2663 2664
		ieee80211_destroy_assoc_data(sdata, false);
	} else {
2665
		if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
J
Johannes Berg 已提交
2666
			/* oops -- internal error -- send timeout for now */
2667
			ieee80211_destroy_assoc_data(sdata, false);
2668
			cfg80211_assoc_timeout(sdata->dev, bss);
2669
			return;
J
Johannes Berg 已提交
2670
		}
2671
		sdata_info(sdata, "associated\n");
2672 2673 2674 2675 2676 2677 2678

		/*
		 * destroy assoc_data afterwards, as otherwise an idle
		 * recalc after assoc_data is NULL but before associated
		 * is set can cause the interface to go idle
		 */
		ieee80211_destroy_assoc_data(sdata, true);
J
Johannes Berg 已提交
2679 2680
	}

2681
	cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len);
J
Johannes Berg 已提交
2682
}
J
Johannes Berg 已提交
2683

2684
static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
J
Johannes Berg 已提交
2685
				  struct ieee80211_mgmt *mgmt, size_t len,
2686
				  struct ieee80211_rx_status *rx_status,
2687
				  struct ieee802_11_elems *elems)
2688 2689 2690
{
	struct ieee80211_local *local = sdata->local;
	int freq;
2691
	struct ieee80211_bss *bss;
2692
	struct ieee80211_channel *channel;
2693

2694
	sdata_assert_lock(sdata);
2695

2696
	if (elems->ds_params)
2697 2698
		freq = ieee80211_channel_to_frequency(elems->ds_params[0],
						      rx_status->band);
2699 2700 2701 2702 2703 2704 2705 2706 2707
	else
		freq = rx_status->freq;

	channel = ieee80211_get_channel(local->hw.wiphy, freq);

	if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
		return;

	bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
2708
					channel);
2709
	if (bss) {
2710
		ieee80211_rx_bss_put(local, bss);
2711 2712
		sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
	}
2713 2714 2715
}


2716
static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
J
Johannes Berg 已提交
2717
					 struct sk_buff *skb)
2718
{
J
Johannes Berg 已提交
2719
	struct ieee80211_mgmt *mgmt = (void *)skb->data;
2720
	struct ieee80211_if_managed *ifmgd;
J
Johannes Berg 已提交
2721 2722
	struct ieee80211_rx_status *rx_status = (void *) skb->cb;
	size_t baselen, len = skb->len;
2723 2724
	struct ieee802_11_elems elems;

2725 2726
	ifmgd = &sdata->u.mgd;

2727
	sdata_assert_lock(sdata);
2728

2729
	if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
2730 2731
		return; /* ignore ProbeResp to foreign address */

2732 2733 2734 2735 2736
	baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
	if (baselen > len)
		return;

	ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
2737
			       false, &elems);
2738

2739
	ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2740

2741
	if (ifmgd->associated &&
2742
	    ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2743
		ieee80211_reset_ap_probe(sdata);
J
Johannes Berg 已提交
2744 2745

	if (ifmgd->auth_data && !ifmgd->auth_data->bss->proberesp_ies &&
2746
	    ether_addr_equal(mgmt->bssid, ifmgd->auth_data->bss->bssid)) {
J
Johannes Berg 已提交
2747
		/* got probe response, continue with auth */
J
Johannes Berg 已提交
2748
		sdata_info(sdata, "direct probe responded\n");
J
Johannes Berg 已提交
2749 2750
		ifmgd->auth_data->tries = 0;
		ifmgd->auth_data->timeout = jiffies;
2751
		ifmgd->auth_data->timeout_started = true;
2752
		run_again(sdata, ifmgd->auth_data->timeout);
J
Johannes Berg 已提交
2753
	}
2754 2755
}

2756 2757 2758 2759 2760 2761 2762 2763 2764 2765 2766 2767 2768 2769
/*
 * This is the canonical list of information elements we care about,
 * the filter code also gives us all changes to the Microsoft OUI
 * (00:50:F2) vendor IE which is used for WMM which we need to track.
 *
 * We implement beacon filtering in software since that means we can
 * avoid processing the frame here and in cfg80211, and userspace
 * will not be able to tell whether the hardware supports it or not.
 *
 * XXX: This list needs to be dynamic -- userspace needs to be able to
 *	add items it requires. It also needs to be able to tell us to
 *	look out for other vendor IEs.
 */
static const u64 care_about_ies =
2770 2771 2772 2773 2774
	(1ULL << WLAN_EID_COUNTRY) |
	(1ULL << WLAN_EID_ERP_INFO) |
	(1ULL << WLAN_EID_CHANNEL_SWITCH) |
	(1ULL << WLAN_EID_PWR_CONSTRAINT) |
	(1ULL << WLAN_EID_HT_CAPABILITY) |
2775
	(1ULL << WLAN_EID_HT_OPERATION);
2776

2777 2778 2779
static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
				     struct ieee80211_mgmt *mgmt, size_t len,
				     struct ieee80211_rx_status *rx_status)
2780
{
2781
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2782
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2783 2784
	size_t baselen;
	struct ieee802_11_elems elems;
2785
	struct ieee80211_local *local = sdata->local;
J
Johannes Berg 已提交
2786 2787
	struct ieee80211_chanctx_conf *chanctx_conf;
	struct ieee80211_channel *chan;
2788
	struct sta_info *sta;
2789
	u32 changed = 0;
2790
	bool erp_valid;
J
Johannes Berg 已提交
2791
	u8 erp_value = 0;
2792
	u32 ncrc;
2793
	u8 *bssid;
2794
	u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
2795

2796
	sdata_assert_lock(sdata);
2797

2798 2799 2800
	/* Process beacon from the current BSS */
	baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
	if (baselen > len)
2801
		return;
2802

J
Johannes Berg 已提交
2803 2804 2805 2806
	rcu_read_lock();
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
	if (!chanctx_conf) {
		rcu_read_unlock();
2807
		return;
J
Johannes Berg 已提交
2808 2809
	}

2810
	if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
J
Johannes Berg 已提交
2811
		rcu_read_unlock();
2812
		return;
J
Johannes Berg 已提交
2813
	}
2814
	chan = chanctx_conf->def.chan;
J
Johannes Berg 已提交
2815
	rcu_read_unlock();
2816

2817
	if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
2818
	    ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
J
Johannes Berg 已提交
2819
		ieee802_11_parse_elems(mgmt->u.beacon.variable,
2820
				       len - baselen, false, &elems);
2821

2822
		ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2823 2824 2825 2826
		if (elems.tim && !elems.parse_error) {
			const struct ieee80211_tim_ie *tim_ie = elems.tim;
			ifmgd->dtim_period = tim_ie->dtim_period;
		}
2827
		ifmgd->have_beacon = true;
2828
		ifmgd->assoc_data->need_beacon = false;
2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839
		if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
			sdata->vif.bss_conf.sync_tsf =
				le64_to_cpu(mgmt->u.beacon.timestamp);
			sdata->vif.bss_conf.sync_device_ts =
				rx_status->device_timestamp;
			if (elems.tim)
				sdata->vif.bss_conf.sync_dtim_count =
					elems.tim->dtim_count;
			else
				sdata->vif.bss_conf.sync_dtim_count = 0;
		}
J
Johannes Berg 已提交
2840 2841
		/* continue assoc process */
		ifmgd->assoc_data->timeout = jiffies;
2842
		ifmgd->assoc_data->timeout_started = true;
2843 2844
		run_again(sdata, ifmgd->assoc_data->timeout);
		return;
J
Johannes Berg 已提交
2845
	}
2846

J
Johannes Berg 已提交
2847
	if (!ifmgd->associated ||
2848
	    !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2849
		return;
J
Johannes Berg 已提交
2850
	bssid = ifmgd->associated->bssid;
2851

2852 2853 2854 2855
	/* Track average RSSI from the Beacon frames of the current AP */
	ifmgd->last_beacon_signal = rx_status->signal;
	if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
		ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
2856
		ifmgd->ave_beacon_signal = rx_status->signal * 16;
2857
		ifmgd->last_cqm_event_signal = 0;
2858
		ifmgd->count_beacon_signal = 1;
2859
		ifmgd->last_ave_beacon_signal = 0;
2860 2861 2862 2863 2864
	} else {
		ifmgd->ave_beacon_signal =
			(IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
			 (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
			 ifmgd->ave_beacon_signal) / 16;
2865
		ifmgd->count_beacon_signal++;
2866
	}
2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879

	if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
	    ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
		int sig = ifmgd->ave_beacon_signal;
		int last_sig = ifmgd->last_ave_beacon_signal;

		/*
		 * if signal crosses either of the boundaries, invoke callback
		 * with appropriate parameters
		 */
		if (sig > ifmgd->rssi_max_thold &&
		    (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
			ifmgd->last_ave_beacon_signal = sig;
2880
			drv_rssi_callback(local, sdata, RSSI_EVENT_HIGH);
2881 2882 2883 2884
		} else if (sig < ifmgd->rssi_min_thold &&
			   (last_sig >= ifmgd->rssi_max_thold ||
			   last_sig == 0)) {
			ifmgd->last_ave_beacon_signal = sig;
2885
			drv_rssi_callback(local, sdata, RSSI_EVENT_LOW);
2886 2887 2888
		}
	}

2889
	if (bss_conf->cqm_rssi_thold &&
2890
	    ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
2891
	    !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905 2906 2907 2908 2909 2910 2911 2912
		int sig = ifmgd->ave_beacon_signal / 16;
		int last_event = ifmgd->last_cqm_event_signal;
		int thold = bss_conf->cqm_rssi_thold;
		int hyst = bss_conf->cqm_rssi_hyst;
		if (sig < thold &&
		    (last_event == 0 || sig < last_event - hyst)) {
			ifmgd->last_cqm_event_signal = sig;
			ieee80211_cqm_rssi_notify(
				&sdata->vif,
				NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
				GFP_KERNEL);
		} else if (sig > thold &&
			   (last_event == 0 || sig > last_event + hyst)) {
			ifmgd->last_cqm_event_signal = sig;
			ieee80211_cqm_rssi_notify(
				&sdata->vif,
				NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
				GFP_KERNEL);
		}
	}

2913
	if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
J
Johannes Berg 已提交
2914
		mlme_dbg_ratelimited(sdata,
2915
				     "cancelling AP probe due to a received beacon\n");
2916
		ieee80211_reset_ap_probe(sdata);
2917 2918
	}

J
Johannes Berg 已提交
2919 2920 2921 2922
	/*
	 * Push the beacon loss detection into the future since
	 * we are processing a beacon from the AP just now.
	 */
2923
	ieee80211_sta_reset_beacon_monitor(sdata);
J
Johannes Berg 已提交
2924

2925 2926
	ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
	ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
2927
					  len - baselen, false, &elems,
2928 2929
					  care_about_ies, ncrc);

2930
	if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
2931 2932 2933
		bool directed_tim = ieee80211_check_tim(elems.tim,
							elems.tim_len,
							ifmgd->aid);
2934
		if (directed_tim) {
2935
			if (local->hw.conf.dynamic_ps_timeout > 0) {
2936 2937 2938 2939 2940
				if (local->hw.conf.flags & IEEE80211_CONF_PS) {
					local->hw.conf.flags &= ~IEEE80211_CONF_PS;
					ieee80211_hw_config(local,
							    IEEE80211_CONF_CHANGE_PS);
				}
2941
				ieee80211_send_nullfunc(local, sdata, 0);
2942
			} else if (!local->pspolling && sdata->u.mgd.powersave) {
2943 2944 2945 2946 2947 2948 2949 2950 2951 2952 2953 2954
				local->pspolling = true;

				/*
				 * Here is assumed that the driver will be
				 * able to send ps-poll frame and receive a
				 * response even though power save mode is
				 * enabled, but some drivers might require
				 * to disable power save here. This needs
				 * to be investigated.
				 */
				ieee80211_send_pspoll(local, sdata);
			}
2955 2956
		}
	}
J
Johannes Berg 已提交
2957

2958
	if (sdata->vif.p2p) {
J
Janusz Dziedzic 已提交
2959
		struct ieee80211_p2p_noa_attr noa = {};
2960 2961 2962 2963 2964
		int ret;

		ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
					    len - baselen,
					    IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
2965
					    (u8 *) &noa, sizeof(noa));
J
Janusz Dziedzic 已提交
2966 2967 2968 2969 2970 2971 2972 2973 2974 2975 2976 2977 2978 2979 2980 2981
		if (ret >= 2) {
			if (sdata->u.mgd.p2p_noa_index != noa.index) {
				/* valid noa_attr and index changed */
				sdata->u.mgd.p2p_noa_index = noa.index;
				memcpy(&bss_conf->p2p_noa_attr, &noa, sizeof(noa));
				changed |= BSS_CHANGED_P2P_PS;
				/*
				 * make sure we update all information, the CRC
				 * mechanism doesn't look at P2P attributes.
				 */
				ifmgd->beacon_crc_valid = false;
			}
		} else if (sdata->u.mgd.p2p_noa_index != -1) {
			/* noa_attr not found and we had valid noa_attr before */
			sdata->u.mgd.p2p_noa_index = -1;
			memset(&bss_conf->p2p_noa_attr, 0, sizeof(bss_conf->p2p_noa_attr));
2982 2983 2984 2985 2986
			changed |= BSS_CHANGED_P2P_PS;
			ifmgd->beacon_crc_valid = false;
		}
	}

2987
	if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
2988
		return;
2989
	ifmgd->beacon_crc = ncrc;
2990
	ifmgd->beacon_crc_valid = true;
2991

2992
	ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
2993

2994 2995 2996
	ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
					 &elems, true);

2997 2998
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
	    ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
2999 3000 3001
				     elems.wmm_param_len))
		changed |= BSS_CHANGED_QOS;

3002 3003
	/*
	 * If we haven't had a beacon before, tell the driver about the
3004
	 * DTIM period (and beacon timing if desired) now.
3005
	 */
3006
	if (!ifmgd->have_beacon) {
3007 3008 3009 3010 3011
		/* a few bogus AP send dtim_period = 0 or no TIM IE */
		if (elems.tim)
			bss_conf->dtim_period = elems.tim->dtim_period ?: 1;
		else
			bss_conf->dtim_period = 1;
3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024

		if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
			sdata->vif.bss_conf.sync_tsf =
				le64_to_cpu(mgmt->u.beacon.timestamp);
			sdata->vif.bss_conf.sync_device_ts =
				rx_status->device_timestamp;
			if (elems.tim)
				sdata->vif.bss_conf.sync_dtim_count =
					elems.tim->dtim_count;
			else
				sdata->vif.bss_conf.sync_dtim_count = 0;
		}

3025 3026
		changed |= BSS_CHANGED_BEACON_INFO;
		ifmgd->have_beacon = true;
3027 3028 3029 3030 3031

		mutex_lock(&local->iflist_mtx);
		ieee80211_recalc_ps(local, -1);
		mutex_unlock(&local->iflist_mtx);

3032
		ieee80211_recalc_ps_vif(sdata);
3033 3034
	}

3035
	if (elems.erp_info) {
J
Johannes Berg 已提交
3036 3037 3038 3039
		erp_valid = true;
		erp_value = elems.erp_info[0];
	} else {
		erp_valid = false;
3040
	}
J
Johannes Berg 已提交
3041 3042 3043
	changed |= ieee80211_handle_bss_capability(sdata,
			le16_to_cpu(mgmt->u.beacon.capab_info),
			erp_valid, erp_value);
3044

3045
	mutex_lock(&local->sta_mtx);
3046 3047
	sta = sta_info_get(sdata, bssid);

3048 3049 3050 3051 3052 3053
	if (ieee80211_config_bw(sdata, sta, elems.ht_operation,
				elems.vht_operation, bssid, &changed)) {
		mutex_unlock(&local->sta_mtx);
		ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
				       WLAN_REASON_DEAUTH_LEAVING,
				       true, deauth_buf);
3054 3055
		cfg80211_tx_mlme_mgmt(sdata->dev, deauth_buf,
				      sizeof(deauth_buf));
3056
		return;
3057
	}
3058 3059 3060 3061

	if (sta && elems.opmode_notif)
		ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
					    rx_status->band, true);
3062
	mutex_unlock(&local->sta_mtx);
3063

3064 3065 3066
	if (elems.country_elem && elems.pwr_constr_elem &&
	    mgmt->u.probe_resp.capab_info &
				cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT))
3067 3068 3069 3070
		changed |= ieee80211_handle_pwr_constr(sdata, chan,
						       elems.country_elem,
						       elems.country_elem_len,
						       elems.pwr_constr_elem);
3071

3072
	ieee80211_bss_info_change_notify(sdata, changed);
3073 3074
}

3075 3076
void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
				  struct sk_buff *skb)
3077 3078 3079 3080
{
	struct ieee80211_rx_status *rx_status;
	struct ieee80211_mgmt *mgmt;
	u16 fc;
3081 3082
	struct ieee802_11_elems elems;
	int ies_len;
3083 3084 3085 3086 3087

	rx_status = (struct ieee80211_rx_status *) skb->cb;
	mgmt = (struct ieee80211_mgmt *) skb->data;
	fc = le16_to_cpu(mgmt->frame_control);

3088
	sdata_lock(sdata);
3089

J
Johannes Berg 已提交
3090 3091
	switch (fc & IEEE80211_FCTL_STYPE) {
	case IEEE80211_STYPE_BEACON:
3092
		ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
J
Johannes Berg 已提交
3093 3094 3095 3096 3097
		break;
	case IEEE80211_STYPE_PROBE_RESP:
		ieee80211_rx_mgmt_probe_resp(sdata, skb);
		break;
	case IEEE80211_STYPE_AUTH:
3098
		ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
3099 3100
		break;
	case IEEE80211_STYPE_DEAUTH:
3101
		ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
3102 3103
		break;
	case IEEE80211_STYPE_DISASSOC:
3104
		ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
3105 3106 3107
		break;
	case IEEE80211_STYPE_ASSOC_RESP:
	case IEEE80211_STYPE_REASSOC_RESP:
3108
		ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
3109 3110
		break;
	case IEEE80211_STYPE_ACTION:
3111
		if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3112 3113 3114
			ies_len = skb->len -
				  offsetof(struct ieee80211_mgmt,
					   u.action.u.chan_switch.variable);
3115 3116 3117 3118 3119 3120

			if (ies_len < 0)
				break;

			ieee802_11_parse_elems(
				mgmt->u.action.u.chan_switch.variable,
3121
				ies_len, true, &elems);
3122 3123 3124 3125

			if (elems.parse_error)
				break;

3126 3127
			ieee80211_sta_process_chanswitch(sdata,
							 rx_status->mactime,
3128
							 &elems, false);
3129 3130 3131 3132 3133 3134 3135 3136 3137 3138
		} else if (mgmt->u.action.category == WLAN_CATEGORY_PUBLIC) {
			ies_len = skb->len -
				  offsetof(struct ieee80211_mgmt,
					   u.action.u.ext_chan_switch.variable);

			if (ies_len < 0)
				break;

			ieee802_11_parse_elems(
				mgmt->u.action.u.ext_chan_switch.variable,
3139
				ies_len, true, &elems);
3140 3141 3142 3143 3144 3145 3146 3147

			if (elems.parse_error)
				break;

			/* for the handling code pretend this was also an IE */
			elems.ext_chansw_ie =
				&mgmt->u.action.u.ext_chan_switch.data;

J
Johannes Berg 已提交
3148
			ieee80211_sta_process_chanswitch(sdata,
3149
							 rx_status->mactime,
3150
							 &elems, false);
3151
		}
3152
		break;
3153
	}
3154
	sdata_unlock(sdata);
3155 3156
}

J
Johannes Berg 已提交
3157
static void ieee80211_sta_timer(unsigned long data)
3158
{
J
Johannes Berg 已提交
3159 3160
	struct ieee80211_sub_if_data *sdata =
		(struct ieee80211_sub_if_data *) data;
3161

3162
	ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3163 3164
}

3165
static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3166
					  u8 *bssid, u8 reason, bool tx)
3167
{
3168
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3169

3170
	ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3171
			       tx, frame_buf);
3172

3173 3174
	cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
			      IEEE80211_DEAUTH_FRAME_LEN);
3175 3176
}

J
Johannes Berg 已提交
3177 3178 3179 3180 3181
static int ieee80211_probe_auth(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3182
	u32 tx_flags = 0;
J
Johannes Berg 已提交
3183

3184
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
3185 3186 3187 3188 3189 3190 3191

	if (WARN_ON_ONCE(!auth_data))
		return -EINVAL;

	auth_data->tries++;

	if (auth_data->tries > IEEE80211_AUTH_MAX_TRIES) {
J
Johannes Berg 已提交
3192 3193
		sdata_info(sdata, "authentication with %pM timed out\n",
			   auth_data->bss->bssid);
J
Johannes Berg 已提交
3194 3195 3196 3197 3198 3199 3200 3201 3202 3203

		/*
		 * Most likely AP is not in the range so remove the
		 * bss struct for that AP.
		 */
		cfg80211_unlink_bss(local->hw.wiphy, auth_data->bss);

		return -ETIMEDOUT;
	}

J
Johannes Berg 已提交
3204 3205
	drv_mgd_prepare_tx(local, sdata);

J
Johannes Berg 已提交
3206
	if (auth_data->bss->proberesp_ies) {
3207 3208 3209
		u16 trans = 1;
		u16 status = 0;

J
Johannes Berg 已提交
3210 3211 3212
		sdata_info(sdata, "send auth to %pM (try %d/%d)\n",
			   auth_data->bss->bssid, auth_data->tries,
			   IEEE80211_AUTH_MAX_TRIES);
J
Johannes Berg 已提交
3213 3214

		auth_data->expected_transaction = 2;
3215 3216 3217 3218 3219 3220 3221

		if (auth_data->algorithm == WLAN_AUTH_SAE) {
			trans = auth_data->sae_trans;
			status = auth_data->sae_status;
			auth_data->expected_transaction = trans;
		}

3222 3223 3224 3225
		if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
			tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
				   IEEE80211_TX_INTFL_MLME_CONN_TX;

3226 3227
		ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
				    auth_data->data, auth_data->data_len,
J
Johannes Berg 已提交
3228
				    auth_data->bss->bssid,
3229 3230
				    auth_data->bss->bssid, NULL, 0, 0,
				    tx_flags);
J
Johannes Berg 已提交
3231 3232 3233
	} else {
		const u8 *ssidie;

J
Johannes Berg 已提交
3234 3235 3236
		sdata_info(sdata, "direct probe to %pM (try %d/%i)\n",
			   auth_data->bss->bssid, auth_data->tries,
			   IEEE80211_AUTH_MAX_TRIES);
J
Johannes Berg 已提交
3237

3238
		rcu_read_lock();
J
Johannes Berg 已提交
3239
		ssidie = ieee80211_bss_get_ie(auth_data->bss, WLAN_EID_SSID);
3240 3241
		if (!ssidie) {
			rcu_read_unlock();
J
Johannes Berg 已提交
3242
			return -EINVAL;
3243
		}
J
Johannes Berg 已提交
3244 3245 3246 3247 3248
		/*
		 * 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, ssidie + 2, ssidie[1],
3249
					 NULL, 0, (u32) -1, true, 0,
J
Johannes Berg 已提交
3250
					 auth_data->bss->channel, false);
3251
		rcu_read_unlock();
J
Johannes Berg 已提交
3252 3253
	}

3254
	if (tx_flags == 0) {
3255
		auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3256
		auth_data->timeout_started = true;
3257
		run_again(sdata, auth_data->timeout);
3258
	} else {
3259 3260 3261 3262
		auth_data->timeout =
			round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
		auth_data->timeout_started = true;
		run_again(sdata, auth_data->timeout);
3263
	}
J
Johannes Berg 已提交
3264 3265 3266 3267 3268 3269 3270 3271 3272

	return 0;
}

static int ieee80211_do_assoc(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;
	struct ieee80211_local *local = sdata->local;

3273
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
3274 3275 3276

	assoc_data->tries++;
	if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
J
Johannes Berg 已提交
3277 3278
		sdata_info(sdata, "association with %pM timed out\n",
			   assoc_data->bss->bssid);
J
Johannes Berg 已提交
3279 3280 3281 3282 3283 3284 3285 3286 3287 3288

		/*
		 * Most likely AP is not in the range so remove the
		 * bss struct for that AP.
		 */
		cfg80211_unlink_bss(local->hw.wiphy, assoc_data->bss);

		return -ETIMEDOUT;
	}

J
Johannes Berg 已提交
3289 3290 3291
	sdata_info(sdata, "associate with %pM (try %d/%d)\n",
		   assoc_data->bss->bssid, assoc_data->tries,
		   IEEE80211_ASSOC_MAX_TRIES);
J
Johannes Berg 已提交
3292 3293
	ieee80211_send_assoc(sdata);

3294 3295
	if (!(local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)) {
		assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3296
		assoc_data->timeout_started = true;
3297
		run_again(sdata, assoc_data->timeout);
3298
	} else {
3299 3300 3301 3302 3303
		assoc_data->timeout =
			round_jiffies_up(jiffies +
					 IEEE80211_ASSOC_TIMEOUT_LONG);
		assoc_data->timeout_started = true;
		run_again(sdata, assoc_data->timeout);
3304
	}
J
Johannes Berg 已提交
3305 3306 3307 3308

	return 0;
}

3309 3310 3311 3312 3313 3314 3315 3316 3317 3318 3319 3320
void ieee80211_mgd_conn_tx_status(struct ieee80211_sub_if_data *sdata,
				  __le16 fc, bool acked)
{
	struct ieee80211_local *local = sdata->local;

	sdata->u.mgd.status_fc = fc;
	sdata->u.mgd.status_acked = acked;
	sdata->u.mgd.status_received = true;

	ieee80211_queue_work(&local->hw, &sdata->work);
}

3321
void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
J
Johannes Berg 已提交
3322 3323
{
	struct ieee80211_local *local = sdata->local;
3324
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
J
Johannes Berg 已提交
3325

3326
	sdata_lock(sdata);
3327

3328 3329 3330 3331 3332 3333 3334 3335 3336 3337
	if (ifmgd->status_received) {
		__le16 fc = ifmgd->status_fc;
		bool status_acked = ifmgd->status_acked;

		ifmgd->status_received = false;
		if (ifmgd->auth_data &&
		    (ieee80211_is_probe_req(fc) || ieee80211_is_auth(fc))) {
			if (status_acked) {
				ifmgd->auth_data->timeout =
					jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3338
				run_again(sdata, ifmgd->auth_data->timeout);
3339 3340 3341
			} else {
				ifmgd->auth_data->timeout = jiffies - 1;
			}
3342
			ifmgd->auth_data->timeout_started = true;
3343 3344 3345 3346 3347 3348
		} else if (ifmgd->assoc_data &&
			   (ieee80211_is_assoc_req(fc) ||
			    ieee80211_is_reassoc_req(fc))) {
			if (status_acked) {
				ifmgd->assoc_data->timeout =
					jiffies + IEEE80211_ASSOC_TIMEOUT_SHORT;
3349
				run_again(sdata, ifmgd->assoc_data->timeout);
3350 3351 3352
			} else {
				ifmgd->assoc_data->timeout = jiffies - 1;
			}
3353
			ifmgd->assoc_data->timeout_started = true;
3354 3355 3356
		}
	}

3357
	if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
J
Johannes Berg 已提交
3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370 3371
	    time_after(jiffies, ifmgd->auth_data->timeout)) {
		if (ifmgd->auth_data->done) {
			/*
			 * ok ... we waited for assoc but userspace didn't,
			 * so let's just kill the auth data
			 */
			ieee80211_destroy_auth_data(sdata, false);
		} else if (ieee80211_probe_auth(sdata)) {
			u8 bssid[ETH_ALEN];

			memcpy(bssid, ifmgd->auth_data->bss->bssid, ETH_ALEN);

			ieee80211_destroy_auth_data(sdata, false);

3372
			cfg80211_auth_timeout(sdata->dev, bssid);
J
Johannes Berg 已提交
3373
		}
3374
	} else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3375
		run_again(sdata, ifmgd->auth_data->timeout);
J
Johannes Berg 已提交
3376

3377
	if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
J
Johannes Berg 已提交
3378
	    time_after(jiffies, ifmgd->assoc_data->timeout)) {
3379
		if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
J
Johannes Berg 已提交
3380
		    ieee80211_do_assoc(sdata)) {
3381
			struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
J
Johannes Berg 已提交
3382 3383

			ieee80211_destroy_assoc_data(sdata, false);
3384
			cfg80211_assoc_timeout(sdata->dev, bss);
J
Johannes Berg 已提交
3385
		}
3386
	} else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3387
		run_again(sdata, ifmgd->assoc_data->timeout);
J
Johannes Berg 已提交
3388

3389
	if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
J
Johannes Berg 已提交
3390
	    ifmgd->associated) {
3391
		u8 bssid[ETH_ALEN];
3392
		int max_tries;
3393

3394
		memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3395

3396
		if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
3397
			max_tries = max_nullfunc_tries;
3398
		else
3399
			max_tries = max_probe_tries;
3400

3401 3402 3403
		/* ACK received for nullfunc probing frame */
		if (!ifmgd->probe_send_count)
			ieee80211_reset_ap_probe(sdata);
3404 3405
		else if (ifmgd->nullfunc_failed) {
			if (ifmgd->probe_send_count < max_tries) {
J
Johannes Berg 已提交
3406 3407 3408 3409
				mlme_dbg(sdata,
					 "No ack for nullfunc frame to AP %pM, try %d/%i\n",
					 bssid, ifmgd->probe_send_count,
					 max_tries);
3410 3411
				ieee80211_mgd_probe_ap_send(sdata);
			} else {
J
Johannes Berg 已提交
3412 3413 3414
				mlme_dbg(sdata,
					 "No ack for nullfunc frame to AP %pM, disconnecting.\n",
					 bssid);
3415
				ieee80211_sta_connection_lost(sdata, bssid,
3416 3417
					WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
					false);
3418 3419
			}
		} else if (time_is_after_jiffies(ifmgd->probe_timeout))
3420
			run_again(sdata, ifmgd->probe_timeout);
3421
		else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
J
Johannes Berg 已提交
3422 3423 3424
			mlme_dbg(sdata,
				 "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
				 bssid, probe_wait_ms);
3425
			ieee80211_sta_connection_lost(sdata, bssid,
3426
				WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3427
		} else if (ifmgd->probe_send_count < max_tries) {
J
Johannes Berg 已提交
3428 3429 3430 3431
			mlme_dbg(sdata,
				 "No probe response from AP %pM after %dms, try %d/%i\n",
				 bssid, probe_wait_ms,
				 ifmgd->probe_send_count, max_tries);
3432 3433
			ieee80211_mgd_probe_ap_send(sdata);
		} else {
J
Johannes Berg 已提交
3434 3435 3436 3437
			/*
			 * We actually lost the connection ... or did we?
			 * Let's make sure!
			 */
3438 3439 3440 3441
			wiphy_debug(local->hw.wiphy,
				    "%s: No probe response from AP %pM"
				    " after %dms, disconnecting.\n",
				    sdata->name,
3442
				    bssid, probe_wait_ms);
3443

3444
			ieee80211_sta_connection_lost(sdata, bssid,
3445
				WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
J
Johannes Berg 已提交
3446 3447 3448
		}
	}

3449
	sdata_unlock(sdata);
3450 3451
}

J
Johannes Berg 已提交
3452 3453 3454 3455 3456 3457 3458 3459 3460
static void ieee80211_sta_bcn_mon_timer(unsigned long data)
{
	struct ieee80211_sub_if_data *sdata =
		(struct ieee80211_sub_if_data *) data;
	struct ieee80211_local *local = sdata->local;

	if (local->quiescing)
		return;

3461
	sdata->u.mgd.connection_loss = false;
3462 3463
	ieee80211_queue_work(&sdata->local->hw,
			     &sdata->u.mgd.beacon_connection_loss_work);
J
Johannes Berg 已提交
3464 3465 3466 3467 3468 3469 3470 3471 3472 3473 3474 3475
}

static void ieee80211_sta_conn_mon_timer(unsigned long data)
{
	struct ieee80211_sub_if_data *sdata =
		(struct ieee80211_sub_if_data *) data;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	struct ieee80211_local *local = sdata->local;

	if (local->quiescing)
		return;

3476
	ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
J
Johannes Berg 已提交
3477 3478 3479 3480 3481 3482 3483 3484 3485 3486 3487
}

static void ieee80211_sta_monitor_work(struct work_struct *work)
{
	struct ieee80211_sub_if_data *sdata =
		container_of(work, struct ieee80211_sub_if_data,
			     u.mgd.monitor_work);

	ieee80211_mgd_probe_ap(sdata, false);
}

J
Johannes Berg 已提交
3488 3489
static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
{
3490 3491
	u32 flags;

3492
	if (sdata->vif.type == NL80211_IFTYPE_STATION) {
3493
		__ieee80211_stop_poll(sdata);
3494

J
Johannes Berg 已提交
3495
		/* let's probe the connection once */
3496 3497 3498 3499
		flags = sdata->local->hw.flags;
		if (!(flags & IEEE80211_HW_CONNECTION_MONITOR))
			ieee80211_queue_work(&sdata->local->hw,
					     &sdata->u.mgd.monitor_work);
J
Johannes Berg 已提交
3500
		/* and do all the other regular work too */
J
Johannes Berg 已提交
3501
		ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3502
	}
J
Johannes Berg 已提交
3503
}
3504

3505 3506 3507 3508 3509
#ifdef CONFIG_PM
void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

3510
	sdata_lock(sdata);
3511
	if (!ifmgd->associated) {
3512
		sdata_unlock(sdata);
3513 3514 3515 3516 3517 3518 3519 3520 3521 3522
		return;
	}

	if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
		sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
		mlme_dbg(sdata, "driver requested disconnect after resume\n");
		ieee80211_sta_connection_lost(sdata,
					      ifmgd->associated->bssid,
					      WLAN_REASON_UNSPECIFIED,
					      true);
3523
		sdata_unlock(sdata);
3524 3525
		return;
	}
3526
	sdata_unlock(sdata);
3527 3528 3529
}
#endif

J
Johannes Berg 已提交
3530 3531
/* interface setup */
void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
3532
{
3533
	struct ieee80211_if_managed *ifmgd;
J
Johannes Berg 已提交
3534

3535
	ifmgd = &sdata->u.mgd;
J
Johannes Berg 已提交
3536
	INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
3537
	INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
3538 3539
	INIT_WORK(&ifmgd->beacon_connection_loss_work,
		  ieee80211_beacon_connection_loss_work);
3540 3541
	INIT_WORK(&ifmgd->csa_connection_drop_work,
		  ieee80211_csa_connection_drop_work);
3542
	INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
3543
	setup_timer(&ifmgd->timer, ieee80211_sta_timer,
S
Sujith 已提交
3544
		    (unsigned long) sdata);
J
Johannes Berg 已提交
3545 3546 3547 3548
	setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
		    (unsigned long) sdata);
	setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
		    (unsigned long) sdata);
3549
	setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
J
Johannes Berg 已提交
3550 3551
		    (unsigned long) sdata);

3552
	ifmgd->flags = 0;
3553
	ifmgd->powersave = sdata->wdev.ps;
3554 3555
	ifmgd->uapsd_queues = sdata->local->hw.uapsd_queues;
	ifmgd->uapsd_max_sp_len = sdata->local->hw.uapsd_max_sp_len;
J
Janusz Dziedzic 已提交
3556
	ifmgd->p2p_noa_index = -1;
J
Johannes Berg 已提交
3557

3558 3559 3560 3561
	if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
		ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
	else
		ifmgd->req_smps = IEEE80211_SMPS_OFF;
3562 3563
}

3564 3565
/* scan finished notification */
void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
J
Johannes Berg 已提交
3566
{
3567
	struct ieee80211_sub_if_data *sdata;
J
Johannes Berg 已提交
3568

3569 3570
	/* Restart STA timers */
	rcu_read_lock();
3571 3572 3573 3574
	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
		if (ieee80211_sdata_running(sdata))
			ieee80211_restart_sta_timer(sdata);
	}
3575 3576
	rcu_read_unlock();
}
J
Johannes Berg 已提交
3577

3578 3579 3580 3581 3582 3583 3584
int ieee80211_max_network_latency(struct notifier_block *nb,
				  unsigned long data, void *dummy)
{
	s32 latency_usec = (s32) data;
	struct ieee80211_local *local =
		container_of(nb, struct ieee80211_local,
			     network_latency_notifier);
3585

3586 3587 3588
	mutex_lock(&local->iflist_mtx);
	ieee80211_recalc_ps(local, latency_usec);
	mutex_unlock(&local->iflist_mtx);
3589

3590
	return 0;
J
Johannes Berg 已提交
3591 3592
}

J
Johannes Berg 已提交
3593 3594 3595 3596 3597 3598 3599 3600 3601 3602 3603 3604
static u8 ieee80211_ht_vht_rx_chains(struct ieee80211_sub_if_data *sdata,
				     struct cfg80211_bss *cbss)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	const u8 *ht_cap_ie, *vht_cap_ie;
	const struct ieee80211_ht_cap *ht_cap;
	const struct ieee80211_vht_cap *vht_cap;
	u8 chains = 1;

	if (ifmgd->flags & IEEE80211_STA_DISABLE_HT)
		return chains;

3605
	ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
J
Johannes Berg 已提交
3606 3607 3608 3609 3610 3611 3612 3613 3614 3615 3616 3617
	if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap)) {
		ht_cap = (void *)(ht_cap_ie + 2);
		chains = ieee80211_mcs_to_chains(&ht_cap->mcs);
		/*
		 * TODO: use "Tx Maximum Number Spatial Streams Supported" and
		 *	 "Tx Unequal Modulation Supported" fields.
		 */
	}

	if (ifmgd->flags & IEEE80211_STA_DISABLE_VHT)
		return chains;

3618
	vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
J
Johannes Berg 已提交
3619 3620 3621 3622 3623 3624 3625 3626 3627 3628 3629 3630 3631 3632 3633 3634 3635 3636
	if (vht_cap_ie && vht_cap_ie[1] >= sizeof(*vht_cap)) {
		u8 nss;
		u16 tx_mcs_map;

		vht_cap = (void *)(vht_cap_ie + 2);
		tx_mcs_map = le16_to_cpu(vht_cap->supp_mcs.tx_mcs_map);
		for (nss = 8; nss > 0; nss--) {
			if (((tx_mcs_map >> (2 * (nss - 1))) & 3) !=
					IEEE80211_VHT_MCS_NOT_SUPPORTED)
				break;
		}
		/* TODO: use "Tx Highest Supported Long GI Data Rate" field? */
		chains = max(chains, nss);
	}

	return chains;
}

3637 3638
static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
				  struct cfg80211_bss *cbss)
3639 3640 3641
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3642
	const struct ieee80211_ht_operation *ht_oper = NULL;
J
Johannes Berg 已提交
3643
	const struct ieee80211_vht_operation *vht_oper = NULL;
3644
	struct ieee80211_supported_band *sband;
3645
	struct cfg80211_chan_def chandef;
J
Johannes Berg 已提交
3646
	int ret;
3647

3648 3649
	sband = local->hw.wiphy->bands[cbss->channel->band];

J
Johannes Berg 已提交
3650 3651 3652 3653
	ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
			  IEEE80211_STA_DISABLE_80P80MHZ |
			  IEEE80211_STA_DISABLE_160MHZ);

3654 3655
	rcu_read_lock();

J
Johannes Berg 已提交
3656 3657
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
	    sband->ht_cap.ht_supported) {
3658
		const u8 *ht_oper_ie, *ht_cap;
3659

3660
		ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
3661 3662
		if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
			ht_oper = (void *)(ht_oper_ie + 2);
3663 3664 3665 3666 3667 3668

		ht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
		if (!ht_cap || ht_cap[1] < sizeof(struct ieee80211_ht_cap)) {
			ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
			ht_oper = NULL;
		}
3669 3670
	}

J
Johannes Berg 已提交
3671 3672
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
	    sband->vht_cap.vht_supported) {
3673
		const u8 *vht_oper_ie, *vht_cap;
J
Johannes Berg 已提交
3674

3675 3676
		vht_oper_ie = ieee80211_bss_get_ie(cbss,
						   WLAN_EID_VHT_OPERATION);
J
Johannes Berg 已提交
3677 3678 3679 3680
		if (vht_oper_ie && vht_oper_ie[1] >= sizeof(*vht_oper))
			vht_oper = (void *)(vht_oper_ie + 2);
		if (vht_oper && !ht_oper) {
			vht_oper = NULL;
J
Johannes Berg 已提交
3681
			sdata_info(sdata,
J
Johannes Berg 已提交
3682
				   "AP advertised VHT without HT, disabling both\n");
3683 3684
			ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
			ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
3685
		}
3686 3687 3688 3689 3690 3691

		vht_cap = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
		if (!vht_cap || vht_cap[1] < sizeof(struct ieee80211_vht_cap)) {
			ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
			vht_oper = NULL;
		}
3692 3693
	}

J
Johannes Berg 已提交
3694 3695 3696
	ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
						     cbss->channel,
						     ht_oper, vht_oper,
3697
						     &chandef, false);
3698

J
Johannes Berg 已提交
3699 3700
	sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
				      local->rx_chains);
3701

3702 3703
	rcu_read_unlock();

3704 3705 3706
	/* will change later if needed */
	sdata->smps_mode = IEEE80211_SMPS_OFF;

3707
	mutex_lock(&local->mtx);
J
Johannes Berg 已提交
3708 3709 3710 3711 3712 3713 3714
	/*
	 * If this fails (possibly due to channel context sharing
	 * on incompatible channels, e.g. 80+80 and 160 sharing the
	 * same control channel) try to use a smaller bandwidth.
	 */
	ret = ieee80211_vif_use_channel(sdata, &chandef,
					IEEE80211_CHANCTX_SHARED);
3715 3716 3717 3718

	/* don't downgrade for 5 and 10 MHz channels, though. */
	if (chandef.width == NL80211_CHAN_WIDTH_5 ||
	    chandef.width == NL80211_CHAN_WIDTH_10)
3719
		goto out;
3720

3721
	while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
3722
		ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
3723 3724 3725
		ret = ieee80211_vif_use_channel(sdata, &chandef,
						IEEE80211_CHANCTX_SHARED);
	}
3726 3727
 out:
	mutex_unlock(&local->mtx);
J
Johannes Berg 已提交
3728
	return ret;
3729 3730 3731 3732 3733 3734 3735 3736 3737 3738 3739 3740 3741 3742 3743 3744 3745 3746 3747 3748 3749 3750 3751 3752 3753 3754
}

static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
				     struct cfg80211_bss *cbss, bool assoc)
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	struct ieee80211_bss *bss = (void *)cbss->priv;
	struct sta_info *new_sta = NULL;
	bool have_sta = false;
	int err;

	if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
		return -EINVAL;

	if (assoc) {
		rcu_read_lock();
		have_sta = sta_info_get(sdata, cbss->bssid);
		rcu_read_unlock();
	}

	if (!have_sta) {
		new_sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
		if (!new_sta)
			return -ENOMEM;
	}
J
Johannes Berg 已提交
3755
	if (new_sta) {
3756 3757 3758
		u32 rates = 0, basic_rates = 0;
		bool have_higher_than_11mbit;
		int min_rate = INT_MAX, min_rate_index = -1;
3759
		struct ieee80211_chanctx_conf *chanctx_conf;
3760
		struct ieee80211_supported_band *sband;
J
Johannes Berg 已提交
3761
		const struct cfg80211_bss_ies *ies;
3762 3763
		int shift;
		u32 rate_flags;
3764 3765 3766 3767 3768 3769

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

		err = ieee80211_prep_channel(sdata, cbss);
		if (err) {
			sta_info_free(local, new_sta);
3770
			return -EINVAL;
3771
		}
3772 3773 3774 3775 3776 3777
		shift = ieee80211_vif_get_shift(&sdata->vif);

		rcu_read_lock();
		chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
		if (WARN_ON(!chanctx_conf)) {
			rcu_read_unlock();
E
Eytan Lifshitz 已提交
3778
			sta_info_free(local, new_sta);
3779 3780 3781 3782
			return -EINVAL;
		}
		rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
		rcu_read_unlock();
3783 3784 3785 3786 3787

		ieee80211_get_rates(sband, bss->supp_rates,
				    bss->supp_rates_len,
				    &rates, &basic_rates,
				    &have_higher_than_11mbit,
3788 3789
				    &min_rate, &min_rate_index,
				    shift, rate_flags);
3790 3791 3792 3793 3794 3795 3796 3797 3798 3799

		/*
		 * This used to be a workaround for basic rates missing
		 * in the association response frame. Now that we no
		 * longer use the basic rates from there, it probably
		 * doesn't happen any more, but keep the workaround so
		 * in case some *other* APs are buggy in different ways
		 * we can connect -- with a warning.
		 */
		if (!basic_rates && min_rate_index >= 0) {
J
Johannes Berg 已提交
3800 3801
			sdata_info(sdata,
				   "No basic rates, using min rate instead\n");
3802 3803 3804
			basic_rates = BIT(min_rate_index);
		}

J
Johannes Berg 已提交
3805
		new_sta->sta.supp_rates[cbss->channel->band] = rates;
3806 3807 3808
		sdata->vif.bss_conf.basic_rates = basic_rates;

		/* cf. IEEE 802.11 9.2.12 */
J
Johannes Berg 已提交
3809
		if (cbss->channel->band == IEEE80211_BAND_2GHZ &&
3810 3811 3812 3813 3814 3815 3816
		    have_higher_than_11mbit)
			sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
		else
			sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;

		memcpy(ifmgd->bssid, cbss->bssid, ETH_ALEN);

3817 3818
		/* set timing information */
		sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
J
Johannes Berg 已提交
3819
		rcu_read_lock();
3820 3821 3822 3823 3824 3825 3826 3827 3828 3829 3830 3831 3832 3833 3834 3835 3836 3837 3838 3839 3840 3841 3842 3843 3844 3845
		ies = rcu_dereference(cbss->beacon_ies);
		if (ies) {
			const u8 *tim_ie;

			sdata->vif.bss_conf.sync_tsf = ies->tsf;
			sdata->vif.bss_conf.sync_device_ts =
				bss->device_ts_beacon;
			tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
						  ies->data, ies->len);
			if (tim_ie && tim_ie[1] >= 2)
				sdata->vif.bss_conf.sync_dtim_count = tim_ie[2];
			else
				sdata->vif.bss_conf.sync_dtim_count = 0;
		} else if (!(local->hw.flags &
					IEEE80211_HW_TIMING_BEACON_ONLY)) {
			ies = rcu_dereference(cbss->proberesp_ies);
			/* must be non-NULL since beacon IEs were NULL */
			sdata->vif.bss_conf.sync_tsf = ies->tsf;
			sdata->vif.bss_conf.sync_device_ts =
				bss->device_ts_presp;
			sdata->vif.bss_conf.sync_dtim_count = 0;
		} else {
			sdata->vif.bss_conf.sync_tsf = 0;
			sdata->vif.bss_conf.sync_device_ts = 0;
			sdata->vif.bss_conf.sync_dtim_count = 0;
		}
J
Johannes Berg 已提交
3846
		rcu_read_unlock();
3847 3848

		/* tell driver about BSSID, basic rates and timing */
3849
		ieee80211_bss_info_change_notify(sdata,
3850 3851
			BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
			BSS_CHANGED_BEACON_INT);
3852 3853

		if (assoc)
J
Johannes Berg 已提交
3854
			sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
3855

J
Johannes Berg 已提交
3856 3857
		err = sta_info_insert(new_sta);
		new_sta = NULL;
3858
		if (err) {
J
Johannes Berg 已提交
3859 3860 3861
			sdata_info(sdata,
				   "failed to insert STA entry for the AP (error %d)\n",
				   err);
3862 3863 3864
			return err;
		}
	} else
3865
		WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
3866 3867 3868 3869

	return 0;
}

3870 3871 3872
/* config hooks */
int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
		       struct cfg80211_auth_request *req)
J
Johannes Berg 已提交
3873
{
J
Johannes Berg 已提交
3874 3875 3876
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	struct ieee80211_mgd_auth_data *auth_data;
3877
	u16 auth_alg;
J
Johannes Berg 已提交
3878 3879 3880
	int err;

	/* prepare auth data structure */
J
Johannes Berg 已提交
3881

3882 3883 3884 3885 3886
	switch (req->auth_type) {
	case NL80211_AUTHTYPE_OPEN_SYSTEM:
		auth_alg = WLAN_AUTH_OPEN;
		break;
	case NL80211_AUTHTYPE_SHARED_KEY:
J
Johannes Berg 已提交
3887
		if (IS_ERR(local->wep_tx_tfm))
3888
			return -EOPNOTSUPP;
3889 3890 3891 3892 3893 3894 3895 3896
		auth_alg = WLAN_AUTH_SHARED_KEY;
		break;
	case NL80211_AUTHTYPE_FT:
		auth_alg = WLAN_AUTH_FT;
		break;
	case NL80211_AUTHTYPE_NETWORK_EAP:
		auth_alg = WLAN_AUTH_LEAP;
		break;
3897 3898 3899
	case NL80211_AUTHTYPE_SAE:
		auth_alg = WLAN_AUTH_SAE;
		break;
3900 3901
	default:
		return -EOPNOTSUPP;
J
Johannes Berg 已提交
3902
	}
3903

3904 3905
	auth_data = kzalloc(sizeof(*auth_data) + req->sae_data_len +
			    req->ie_len, GFP_KERNEL);
J
Johannes Berg 已提交
3906
	if (!auth_data)
J
Johannes Berg 已提交
3907
		return -ENOMEM;
3908

J
Johannes Berg 已提交
3909
	auth_data->bss = req->bss;
3910

3911 3912 3913 3914 3915 3916 3917 3918 3919
	if (req->sae_data_len >= 4) {
		__le16 *pos = (__le16 *) req->sae_data;
		auth_data->sae_trans = le16_to_cpu(pos[0]);
		auth_data->sae_status = le16_to_cpu(pos[1]);
		memcpy(auth_data->data, req->sae_data + 4,
		       req->sae_data_len - 4);
		auth_data->data_len += req->sae_data_len - 4;
	}

3920
	if (req->ie && req->ie_len) {
3921 3922 3923
		memcpy(&auth_data->data[auth_data->data_len],
		       req->ie, req->ie_len);
		auth_data->data_len += req->ie_len;
J
Johannes Berg 已提交
3924
	}
3925

J
Johannes Berg 已提交
3926
	if (req->key && req->key_len) {
J
Johannes Berg 已提交
3927 3928 3929
		auth_data->key_len = req->key_len;
		auth_data->key_idx = req->key_idx;
		memcpy(auth_data->key, req->key, req->key_len);
J
Johannes Berg 已提交
3930 3931
	}

J
Johannes Berg 已提交
3932
	auth_data->algorithm = auth_alg;
J
Johannes Berg 已提交
3933

J
Johannes Berg 已提交
3934
	/* try to authenticate/probe */
3935

J
Johannes Berg 已提交
3936 3937 3938 3939
	if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
	    ifmgd->assoc_data) {
		err = -EBUSY;
		goto err_free;
3940 3941
	}

J
Johannes Berg 已提交
3942 3943
	if (ifmgd->auth_data)
		ieee80211_destroy_auth_data(sdata, false);
3944

J
Johannes Berg 已提交
3945 3946
	/* prep auth_data so we don't go into idle on disassoc */
	ifmgd->auth_data = auth_data;
J
Johannes Berg 已提交
3947

3948 3949 3950 3951 3952 3953 3954
	if (ifmgd->associated) {
		u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];

		ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
				       WLAN_REASON_UNSPECIFIED,
				       false, frame_buf);

3955 3956
		cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
				      sizeof(frame_buf));
3957
	}
J
Johannes Berg 已提交
3958

J
Johannes Berg 已提交
3959
	sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
3960

3961 3962
	err = ieee80211_prep_connection(sdata, req->bss, false);
	if (err)
J
Johannes Berg 已提交
3963
		goto err_clear;
J
Johannes Berg 已提交
3964

J
Johannes Berg 已提交
3965 3966 3967 3968 3969 3970 3971
	err = ieee80211_probe_auth(sdata);
	if (err) {
		sta_info_destroy_addr(sdata, req->bss->bssid);
		goto err_clear;
	}

	/* hold our own reference */
3972
	cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
3973
	return 0;
J
Johannes Berg 已提交
3974 3975

 err_clear:
3976 3977
	memset(ifmgd->bssid, 0, ETH_ALEN);
	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
J
Johannes Berg 已提交
3978 3979 3980 3981
	ifmgd->auth_data = NULL;
 err_free:
	kfree(auth_data);
	return err;
J
Johannes Berg 已提交
3982 3983
}

3984 3985 3986 3987 3988 3989 3990 3991 3992 3993 3994 3995 3996 3997 3998 3999 4000 4001 4002 4003 4004 4005 4006 4007 4008 4009 4010 4011 4012 4013 4014 4015 4016 4017 4018 4019 4020 4021
static bool ieee80211_usable_wmm_params(struct ieee80211_sub_if_data *sdata,
					const u8 *wmm_param, int len)
{
	const u8 *pos;
	size_t left;

	if (len < 8)
		return false;

	if (wmm_param[5] != 1 /* version */)
		return false;

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

	for (; left >= 4; left -= 4, pos += 4) {
		u8 aifsn = pos[0] & 0x0f;
		u8 ecwmin = pos[1] & 0x0f;
		u8 ecwmax = (pos[1] & 0xf0) >> 4;
		int aci = (pos[0] >> 5) & 0x03;

		if (aifsn < 2) {
			sdata_info(sdata,
				   "AP has invalid WMM params (AIFSN=%d for ACI %d), disabling WMM\n",
				   aifsn, aci);
			return false;
		}
		if (ecwmin > ecwmax) {
			sdata_info(sdata,
				   "AP has invalid WMM params (ECWmin/max=%d/%d for ACI %d), disabling WMM\n",
				   ecwmin, ecwmax, aci);
			return false;
		}
	}

	return true;
}

4022 4023
int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
			struct cfg80211_assoc_request *req)
4024
{
J
Johannes Berg 已提交
4025
	struct ieee80211_local *local = sdata->local;
4026
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4027
	struct ieee80211_bss *bss = (void *)req->bss->priv;
J
Johannes Berg 已提交
4028
	struct ieee80211_mgd_assoc_data *assoc_data;
4029
	const struct cfg80211_bss_ies *beacon_ies;
J
Johannes Berg 已提交
4030
	struct ieee80211_supported_band *sband;
4031
	const u8 *ssidie, *ht_ie, *vht_ie;
4032
	int i, err;
4033

J
Johannes Berg 已提交
4034 4035 4036 4037
	assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
	if (!assoc_data)
		return -ENOMEM;

4038 4039 4040 4041 4042 4043 4044 4045 4046 4047 4048
	rcu_read_lock();
	ssidie = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
	if (!ssidie) {
		rcu_read_unlock();
		kfree(assoc_data);
		return -EINVAL;
	}
	memcpy(assoc_data->ssid, ssidie + 2, ssidie[1]);
	assoc_data->ssid_len = ssidie[1];
	rcu_read_unlock();

4049 4050 4051 4052 4053 4054 4055
	if (ifmgd->associated) {
		u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];

		ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
				       WLAN_REASON_UNSPECIFIED,
				       false, frame_buf);

4056 4057
		cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
				      sizeof(frame_buf));
4058
	}
J
Johannes Berg 已提交
4059 4060 4061 4062

	if (ifmgd->auth_data && !ifmgd->auth_data->done) {
		err = -EBUSY;
		goto err_free;
J
Johannes Berg 已提交
4063
	}
4064

J
Johannes Berg 已提交
4065 4066 4067 4068
	if (ifmgd->assoc_data) {
		err = -EBUSY;
		goto err_free;
	}
4069

J
Johannes Berg 已提交
4070 4071 4072 4073
	if (ifmgd->auth_data) {
		bool match;

		/* keep sta info, bssid if matching */
4074
		match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
J
Johannes Berg 已提交
4075
		ieee80211_destroy_auth_data(sdata, match);
4076 4077
	}

J
Johannes Berg 已提交
4078
	/* prepare assoc data */
4079

4080 4081
	ifmgd->beacon_crc_valid = false;

4082 4083 4084 4085 4086 4087 4088 4089 4090 4091 4092 4093 4094 4095 4096 4097 4098 4099 4100 4101 4102 4103 4104 4105 4106 4107 4108 4109 4110 4111 4112 4113 4114 4115 4116 4117
	assoc_data->wmm = bss->wmm_used &&
			  (local->hw.queues >= IEEE80211_NUM_ACS);
	if (assoc_data->wmm) {
		/* try to check validity of WMM params IE */
		const struct cfg80211_bss_ies *ies;
		const u8 *wp, *start, *end;

		rcu_read_lock();
		ies = rcu_dereference(req->bss->ies);
		start = ies->data;
		end = start + ies->len;

		while (true) {
			wp = cfg80211_find_vendor_ie(
				WLAN_OUI_MICROSOFT,
				WLAN_OUI_TYPE_MICROSOFT_WMM,
				start, end - start);
			if (!wp)
				break;
			start = wp + wp[1] + 2;
			/* if this IE is too short, try the next */
			if (wp[1] <= 4)
				continue;
			/* if this IE is WMM params, we found what we wanted */
			if (wp[6] == 1)
				break;
		}

		if (!wp || !ieee80211_usable_wmm_params(sdata, wp + 2,
							wp[1] - 2)) {
			assoc_data->wmm = false;
			ifmgd->flags |= IEEE80211_STA_DISABLE_WMM;
		}
		rcu_read_unlock();
	}

J
Johannes Berg 已提交
4118 4119 4120 4121 4122 4123 4124
	/*
	 * 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.
	 * We can set this to true for non-11n hardware, that'll be checked
	 * separately along with the peer capabilities.
	 */
4125
	for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4126 4127
		if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
		    req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4128
		    req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4129
			ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4130
			ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4131
			netdev_info(sdata->dev,
4132
				    "disabling HT/VHT due to WEP/TKIP use\n");
4133 4134
		}
	}
4135

4136
	if (req->flags & ASSOC_REQ_DISABLE_HT) {
4137
		ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4138 4139
		ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
	}
B
Ben Greear 已提交
4140

4141 4142 4143
	if (req->flags & ASSOC_REQ_DISABLE_VHT)
		ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;

J
Johannes Berg 已提交
4144 4145 4146
	/* Also disable HT if we don't support it or the AP doesn't use WMM */
	sband = local->hw.wiphy->bands[req->bss->channel->band];
	if (!sband->ht_cap.ht_supported ||
4147 4148
	    local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
	    ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4149
		ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4150 4151
		if (!bss->wmm_used &&
		    !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4152 4153
			netdev_info(sdata->dev,
				    "disabling HT as WMM/QoS is not supported by the AP\n");
4154
	}
J
Johannes Berg 已提交
4155

4156 4157
	/* disable VHT if we don't support it or the AP doesn't use WMM */
	if (!sband->vht_cap.vht_supported ||
4158 4159
	    local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
	    ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4160
		ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4161 4162
		if (!bss->wmm_used &&
		    !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4163 4164
			netdev_info(sdata->dev,
				    "disabling VHT as WMM/QoS is not supported by the AP\n");
4165 4166
	}

B
Ben Greear 已提交
4167 4168 4169 4170
	memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
	memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
	       sizeof(ifmgd->ht_capa_mask));

4171 4172 4173 4174
	memcpy(&ifmgd->vht_capa, &req->vht_capa, sizeof(ifmgd->vht_capa));
	memcpy(&ifmgd->vht_capa_mask, &req->vht_capa_mask,
	       sizeof(ifmgd->vht_capa_mask));

4175
	if (req->ie && req->ie_len) {
J
Johannes Berg 已提交
4176 4177 4178
		memcpy(assoc_data->ie, req->ie, req->ie_len);
		assoc_data->ie_len = req->ie_len;
	}
4179

J
Johannes Berg 已提交
4180
	assoc_data->bss = req->bss;
4181

J
Johannes Berg 已提交
4182 4183
	if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
		if (ifmgd->powersave)
4184
			sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
J
Johannes Berg 已提交
4185
		else
4186
			sdata->smps_mode = IEEE80211_SMPS_OFF;
J
Johannes Berg 已提交
4187
	} else
4188
		sdata->smps_mode = ifmgd->req_smps;
J
Johannes Berg 已提交
4189

J
Johannes Berg 已提交
4190 4191 4192
	assoc_data->capability = req->bss->capability;
	assoc_data->supp_rates = bss->supp_rates;
	assoc_data->supp_rates_len = bss->supp_rates_len;
4193

4194
	rcu_read_lock();
4195 4196 4197 4198 4199
	ht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_OPERATION);
	if (ht_ie && ht_ie[1] >= sizeof(struct ieee80211_ht_operation))
		assoc_data->ap_ht_param =
			((struct ieee80211_ht_operation *)(ht_ie + 2))->ht_param;
	else
4200
		ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4201 4202 4203 4204 4205 4206
	vht_ie = ieee80211_bss_get_ie(req->bss, WLAN_EID_VHT_CAPABILITY);
	if (vht_ie && vht_ie[1] >= sizeof(struct ieee80211_vht_cap))
		memcpy(&assoc_data->ap_vht_cap, vht_ie + 2,
		       sizeof(struct ieee80211_vht_cap));
	else
		ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4207
	rcu_read_unlock();
4208

K
Kalle Valo 已提交
4209
	if (bss->wmm_used && bss->uapsd_supported &&
4210 4211
	    (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD) &&
	    sdata->wmm_acm != 0xff) {
4212
		assoc_data->uapsd = true;
K
Kalle Valo 已提交
4213 4214
		ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
	} else {
4215
		assoc_data->uapsd = false;
K
Kalle Valo 已提交
4216 4217 4218
		ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
	}

4219
	if (req->prev_bssid)
J
Johannes Berg 已提交
4220
		memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4221 4222 4223 4224 4225 4226 4227 4228 4229 4230 4231 4232 4233 4234

	if (req->use_mfp) {
		ifmgd->mfp = IEEE80211_MFP_REQUIRED;
		ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
	} else {
		ifmgd->mfp = IEEE80211_MFP_DISABLED;
		ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
	}

	if (req->crypto.control_port)
		ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
	else
		ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;

4235 4236
	sdata->control_port_protocol = req->crypto.control_port_ethertype;
	sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4237 4238
	sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
							sdata->vif.type);
4239

J
Johannes Berg 已提交
4240 4241 4242
	/* kick off associate process */

	ifmgd->assoc_data = assoc_data;
4243
	ifmgd->dtim_period = 0;
4244
	ifmgd->have_beacon = false;
J
Johannes Berg 已提交
4245

4246 4247 4248
	err = ieee80211_prep_connection(sdata, req->bss, true);
	if (err)
		goto err_clear;
J
Johannes Berg 已提交
4249

4250 4251
	rcu_read_lock();
	beacon_ies = rcu_dereference(req->bss->beacon_ies);
4252

4253 4254 4255 4256 4257 4258 4259 4260 4261
	if (sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_BEFORE_ASSOC &&
	    !beacon_ies) {
		/*
		 * Wait up to one beacon interval ...
		 * should this be more if we miss one?
		 */
		sdata_info(sdata, "waiting for beacon from %pM\n",
			   ifmgd->bssid);
		assoc_data->timeout = TU_TO_EXP_TIME(req->bss->beacon_interval);
4262
		assoc_data->timeout_started = true;
4263 4264 4265 4266 4267
		assoc_data->need_beacon = true;
	} else if (beacon_ies) {
		const u8 *tim_ie = cfg80211_find_ie(WLAN_EID_TIM,
						    beacon_ies->data,
						    beacon_ies->len);
4268 4269
		u8 dtim_count = 0;

4270 4271 4272 4273
		if (tim_ie && tim_ie[1] >= sizeof(struct ieee80211_tim_ie)) {
			const struct ieee80211_tim_ie *tim;
			tim = (void *)(tim_ie + 2);
			ifmgd->dtim_period = tim->dtim_period;
4274
			dtim_count = tim->dtim_count;
4275
		}
4276
		ifmgd->have_beacon = true;
J
Johannes Berg 已提交
4277
		assoc_data->timeout = jiffies;
4278
		assoc_data->timeout_started = true;
4279 4280 4281 4282 4283 4284 4285

		if (local->hw.flags & IEEE80211_HW_TIMING_BEACON_ONLY) {
			sdata->vif.bss_conf.sync_tsf = beacon_ies->tsf;
			sdata->vif.bss_conf.sync_device_ts =
				bss->device_ts_beacon;
			sdata->vif.bss_conf.sync_dtim_count = dtim_count;
		}
4286 4287
	} else {
		assoc_data->timeout = jiffies;
4288
		assoc_data->timeout_started = true;
J
Johannes Berg 已提交
4289
	}
4290 4291
	rcu_read_unlock();

4292
	run_again(sdata, assoc_data->timeout);
J
Johannes Berg 已提交
4293

P
Paul Stewart 已提交
4294 4295 4296 4297 4298 4299 4300 4301 4302 4303
	if (bss->corrupt_data) {
		char *corrupt_type = "data";
		if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_BEACON) {
			if (bss->corrupt_data &
					IEEE80211_BSS_CORRUPT_PROBE_RESP)
				corrupt_type = "beacon and probe response";
			else
				corrupt_type = "beacon";
		} else if (bss->corrupt_data & IEEE80211_BSS_CORRUPT_PROBE_RESP)
			corrupt_type = "probe response";
J
Johannes Berg 已提交
4304 4305
		sdata_info(sdata, "associating with AP with corrupt %s\n",
			   corrupt_type);
P
Paul Stewart 已提交
4306 4307
	}

4308
	return 0;
J
Johannes Berg 已提交
4309
 err_clear:
4310 4311
	memset(ifmgd->bssid, 0, ETH_ALEN);
	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
J
Johannes Berg 已提交
4312 4313 4314 4315
	ifmgd->assoc_data = NULL;
 err_free:
	kfree(assoc_data);
	return err;
4316 4317
}

4318
int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4319
			 struct cfg80211_deauth_request *req)
4320
{
4321
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4322
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4323
	bool tx = !req->local_state_change;
4324
	bool report_frame = false;
4325

J
Johannes Berg 已提交
4326 4327 4328
	sdata_info(sdata,
		   "deauthenticating from %pM by local choice (reason=%d)\n",
		   req->bssid, req->reason_code);
4329

4330
	if (ifmgd->auth_data) {
4331
		drv_mgd_prepare_tx(sdata->local, sdata);
4332 4333
		ieee80211_send_deauth_disassoc(sdata, req->bssid,
					       IEEE80211_STYPE_DEAUTH,
4334
					       req->reason_code, tx,
4335
					       frame_buf);
4336 4337
		ieee80211_destroy_auth_data(sdata, false);

4338
		report_frame = true;
4339
		goto out;
4340 4341
	}

4342 4343 4344 4345
	if (ifmgd->associated &&
	    ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
		ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
				       req->reason_code, tx, frame_buf);
4346
		report_frame = true;
4347
	}
4348

4349
 out:
4350
	if (report_frame)
4351 4352
		cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
				      IEEE80211_DEAUTH_FRAME_LEN);
4353

4354 4355
	return 0;
}
4356

4357
int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
4358
			   struct cfg80211_disassoc_request *req)
J
Johannes Berg 已提交
4359
{
4360
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4361
	u8 bssid[ETH_ALEN];
4362
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
J
Johannes Berg 已提交
4363

J
Johannes Berg 已提交
4364 4365 4366 4367 4368 4369
	/*
	 * cfg80211 should catch this ... but it's racy since
	 * we can receive a disassoc frame, process it, hand it
	 * to cfg80211 while that's in a locked section already
	 * trying to tell us that the user wants to disconnect.
	 */
4370
	if (ifmgd->associated != req->bss)
4371 4372
		return -ENOLINK;

J
Johannes Berg 已提交
4373 4374 4375
	sdata_info(sdata,
		   "disassociating from %pM by local choice (reason=%d)\n",
		   req->bss->bssid, req->reason_code);
4376

4377
	memcpy(bssid, req->bss->bssid, ETH_ALEN);
4378 4379 4380
	ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
			       req->reason_code, !req->local_state_change,
			       frame_buf);
4381

4382 4383
	cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
			      IEEE80211_DEAUTH_FRAME_LEN);
4384

4385 4386
	return 0;
}
4387

4388
void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
4389 4390 4391
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

4392 4393 4394 4395 4396 4397 4398 4399 4400 4401 4402
	/*
	 * Make sure some work items will not run after this,
	 * they will not do anything but might not have been
	 * cancelled when disconnecting.
	 */
	cancel_work_sync(&ifmgd->monitor_work);
	cancel_work_sync(&ifmgd->beacon_connection_loss_work);
	cancel_work_sync(&ifmgd->request_smps_work);
	cancel_work_sync(&ifmgd->csa_connection_drop_work);
	cancel_work_sync(&ifmgd->chswitch_work);

4403
	sdata_lock(sdata);
4404 4405
	if (ifmgd->assoc_data) {
		struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
4406
		ieee80211_destroy_assoc_data(sdata, false);
4407 4408
		cfg80211_assoc_timeout(sdata->dev, bss);
	}
4409 4410 4411
	if (ifmgd->auth_data)
		ieee80211_destroy_auth_data(sdata, false);
	del_timer_sync(&ifmgd->timer);
4412
	sdata_unlock(sdata);
4413 4414
}

4415 4416 4417 4418 4419 4420
void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
			       enum nl80211_cqm_rssi_threshold_event rssi_event,
			       gfp_t gfp)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);

J
Johannes Berg 已提交
4421 4422
	trace_api_cqm_rssi_notify(sdata, rssi_event);

4423 4424 4425
	cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
}
EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);