mlme.c 145.6 KB
Newer Older
1 2
/*
 * BSS client mode implementation
3
 * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
4 5 6 7
 * 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>
8
 * Copyright 2013-2014  Intel Mobile Communications GmbH
9
 * Copyright (C) 2015 - 2017 Intel Deutschland GmbH
10 11 12 13 14 15
 *
 * 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.
 */

16
#include <linux/delay.h>
17 18 19 20
#include <linux/if_ether.h>
#include <linux/skbuff.h>
#include <linux/if_arp.h>
#include <linux/etherdevice.h>
21
#include <linux/moduleparam.h>
22
#include <linux/rtnetlink.h>
23
#include <linux/crc32.h>
24
#include <linux/slab.h>
25
#include <linux/export.h>
26
#include <net/mac80211.h>
27
#include <asm/unaligned.h>
J
Johannes Berg 已提交
28

29
#include "ieee80211_i.h"
30
#include "driver-ops.h"
J
Johannes Berg 已提交
31 32
#include "rate.h"
#include "led.h"
33
#include "fils_aead.h"
34

35
#define IEEE80211_AUTH_TIMEOUT		(HZ / 5)
36
#define IEEE80211_AUTH_TIMEOUT_LONG	(HZ / 2)
37 38 39 40
#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)
41
#define IEEE80211_ASSOC_TIMEOUT_LONG	(HZ / 2)
42 43
#define IEEE80211_ASSOC_TIMEOUT_SHORT	(HZ / 10)
#define IEEE80211_ASSOC_MAX_TRIES	3
J
Johannes Berg 已提交
44

45 46 47 48 49 50 51 52 53
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
54 55

/*
56 57 58 59 60 61
 * 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
62
 */
63 64 65 66
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.");
67

J
Johannes Berg 已提交
68 69 70 71
/*
 * Time the connection can be idle before we probe
 * it to see if we can still talk to the AP.
 */
72
#define IEEE80211_CONNECTION_IDLE_TIME	(30 * HZ)
J
Johannes Berg 已提交
73 74 75 76 77
/*
 * Time we wait for a probe response after sending
 * a probe request because of beacon loss or for
 * checking the connection still works.
 */
78 79 80 81 82
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).");
83

84 85 86 87 88 89
/*
 * 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
90 91 92 93 94 95 96 97 98 99
/*
 * 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.
 */
100 101
static void run_again(struct ieee80211_sub_if_data *sdata,
		      unsigned long timeout)
J
Johannes Berg 已提交
102
{
103
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
104

105 106 107
	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
108 109
}

110
void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
J
Johannes Berg 已提交
111
{
112
	if (sdata->vif.driver_flags & IEEE80211_VIF_BEACON_FILTER)
J
Johannes Berg 已提交
113 114
		return;

115
	if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
116 117
		return;

J
Johannes Berg 已提交
118
	mod_timer(&sdata->u.mgd.bcn_mon_timer,
119
		  round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
J
Johannes Berg 已提交
120 121
}

122 123
void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
{
124 125
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

126
	if (unlikely(!ifmgd->associated))
127 128
		return;

129 130
	if (ifmgd->probe_send_count)
		ifmgd->probe_send_count = 0;
131

132
	if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
133 134
		return;

135
	mod_timer(&ifmgd->conn_mon_timer,
136 137 138
		  round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
}

139
static int ecw2cw(int ecw)
J
Johannes Berg 已提交
140
{
141
	return (1 << ecw) - 1;
J
Johannes Berg 已提交
142 143
}

144 145 146 147
static u32
ieee80211_determine_chantype(struct ieee80211_sub_if_data *sdata,
			     struct ieee80211_supported_band *sband,
			     struct ieee80211_channel *channel,
148
			     const struct ieee80211_ht_cap *ht_cap,
149 150
			     const struct ieee80211_ht_operation *ht_oper,
			     const struct ieee80211_vht_operation *vht_oper,
151
			     struct cfg80211_chan_def *chandef, bool tracking)
152
{
153
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
154
	struct cfg80211_chan_def vht_chandef;
155
	struct ieee80211_sta_ht_cap sta_ht_cap;
156 157
	u32 ht_cfreq, ret;

158 159 160
	memcpy(&sta_ht_cap, &sband->ht_cap, sizeof(sta_ht_cap));
	ieee80211_apply_htcap_overrides(sdata, &sta_ht_cap);

161 162 163 164 165
	chandef->chan = channel;
	chandef->width = NL80211_CHAN_WIDTH_20_NOHT;
	chandef->center_freq1 = channel->center_freq;
	chandef->center_freq2 = 0;

166
	if (!ht_cap || !ht_oper || !sta_ht_cap.ht_supported) {
167 168 169 170 171 172
		ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
		goto out;
	}

	chandef->width = NL80211_CHAN_WIDTH_20;

173 174
	if (!(ht_cap->cap_info &
	      cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40))) {
175
		ret = IEEE80211_STA_DISABLE_40MHZ;
176
		vht_chandef = *chandef;
177 178 179
		goto out;
	}

180 181 182
	ht_cfreq = ieee80211_channel_to_frequency(ht_oper->primary_chan,
						  channel->band);
	/* check that channel matches the right operating channel */
183
	if (!tracking && channel->center_freq != ht_cfreq) {
184 185 186 187 188 189 190
		/*
		 * 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.
		 */
191 192 193 194
		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);
195 196 197 198 199
		ret = IEEE80211_STA_DISABLE_HT | IEEE80211_STA_DISABLE_VHT;
		goto out;
	}

	/* check 40 MHz support, if we have it */
200
	if (sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) {
201
		ieee80211_chandef_ht_oper(ht_oper, chandef);
202 203 204
	} else {
		/* 40 MHz (and 80 MHz) must be supported for VHT */
		ret = IEEE80211_STA_DISABLE_VHT;
205 206
		/* also mark 40 MHz disabled */
		ret |= IEEE80211_STA_DISABLE_40MHZ;
207 208 209 210 211 212 213 214
		goto out;
	}

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

215 216
	vht_chandef = *chandef;
	if (!ieee80211_chandef_vht_oper(vht_oper, &vht_chandef)) {
217
		if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
218
			sdata_info(sdata,
219
				   "AP VHT information is invalid, disable VHT\n");
220 221 222 223 224
		ret = IEEE80211_STA_DISABLE_VHT;
		goto out;
	}

	if (!cfg80211_chandef_valid(&vht_chandef)) {
225
		if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
226 227
			sdata_info(sdata,
				   "AP VHT information is invalid, disable VHT\n");
228 229 230 231 232 233 234 235 236 237
		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)) {
238
		if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
239 240
			sdata_info(sdata,
				   "AP VHT information doesn't match HT, disable VHT\n");
241 242 243 244 245 246 247 248 249
		ret = IEEE80211_STA_DISABLE_VHT;
		goto out;
	}

	*chandef = vht_chandef;

	ret = 0;

out:
250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271
	/*
	 * 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;

272 273 274 275
	/* don't print the message below for VHT mismatch if VHT is disabled */
	if (ret & IEEE80211_STA_DISABLE_VHT)
		vht_chandef = *chandef;

276 277 278 279 280 281 282 283
	/*
	 * 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.
	 */
284
	while (!cfg80211_chandef_usable(sdata->local->hw.wiphy, chandef,
285 286
					tracking ? 0 :
						   IEEE80211_CHAN_DISABLED)) {
287 288 289
		if (WARN_ON(chandef->width == NL80211_CHAN_WIDTH_20_NOHT)) {
			ret = IEEE80211_STA_DISABLE_HT |
			      IEEE80211_STA_DISABLE_VHT;
290
			break;
291 292
		}

293
		ret |= ieee80211_chandef_downgrade(chandef);
294 295
	}

296
	if (chandef->width != vht_chandef.width && !tracking)
297 298 299 300 301 302 303
		sdata_info(sdata,
			   "capabilities/regulatory prevented using AP HT/VHT configuration, downgraded\n");

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

304 305
static int ieee80211_config_bw(struct ieee80211_sub_if_data *sdata,
			       struct sta_info *sta,
306
			       const struct ieee80211_ht_cap *ht_cap,
307 308 309
			       const struct ieee80211_ht_operation *ht_oper,
			       const struct ieee80211_vht_operation *vht_oper,
			       const u8 *bssid, u32 *changed)
310 311
{
	struct ieee80211_local *local = sdata->local;
312
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
313
	struct ieee80211_supported_band *sband;
J
Johannes Berg 已提交
314
	struct ieee80211_channel *chan;
315
	struct cfg80211_chan_def chandef;
316
	u16 ht_opmode;
317 318 319
	u32 flags;
	enum ieee80211_sta_rx_bandwidth new_sta_bw;
	int ret;
320

321 322
	/* if HT was/is disabled, don't track any bandwidth changes */
	if (ifmgd->flags & IEEE80211_STA_DISABLE_HT || !ht_oper)
323 324
		return 0;

325 326 327 328 329 330 331
	/* 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;

332 333 334 335 336 337 338 339 340 341
	/*
	 * 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;
	}

342
	chan = sdata->vif.bss_conf.chandef.chan;
J
Johannes Berg 已提交
343
	sband = local->hw.wiphy->bands[chan->band];
344

345
	/* calculate new channel (type) based on HT/VHT operation IEs */
346 347 348
	flags = ieee80211_determine_chantype(sdata, sband, chan,
					     ht_cap, ht_oper, vht_oper,
					     &chandef, true);
349 350 351 352 353 354 355 356 357 358

	/*
	 * 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)
359
		flags |= ieee80211_chandef_downgrade(&chandef);
360 361
	if (ifmgd->flags & IEEE80211_STA_DISABLE_160MHZ &&
	    chandef.width == NL80211_CHAN_WIDTH_160)
362
		flags |= ieee80211_chandef_downgrade(&chandef);
363 364
	if (ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ &&
	    chandef.width > NL80211_CHAN_WIDTH_20)
365
		flags |= ieee80211_chandef_downgrade(&chandef);
366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391

	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;
392
	case NL80211_CHAN_WIDTH_40:
393
		new_sta_bw = IEEE80211_STA_RX_BW_40;
394
		break;
395 396 397 398 399 400
	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;
401
		break;
402 403
	default:
		return -EINVAL;
404
	}
405

406 407
	if (new_sta_bw > sta->cur_max_bandwidth)
		new_sta_bw = sta->cur_max_bandwidth;
408

409 410 411 412 413
	if (new_sta_bw < sta->sta.bandwidth) {
		sta->sta.bandwidth = new_sta_bw;
		rate_control_rate_update(local, sband, sta,
					 IEEE80211_RC_BW_CHANGED);
	}
414

415 416 417 418 419 420 421
	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;
	}
422

423 424 425 426
	if (new_sta_bw > sta->sta.bandwidth) {
		sta->sta.bandwidth = new_sta_bw;
		rate_control_rate_update(local, sband, sta,
					 IEEE80211_RC_BW_CHANGED);
427
	}
428

429
	return 0;
430 431
}

J
Johannes Berg 已提交
432 433
/* frame sending functions */

J
Johannes Berg 已提交
434
static void ieee80211_add_ht_ie(struct ieee80211_sub_if_data *sdata,
435
				struct sk_buff *skb, u8 ap_ht_param,
J
Johannes Berg 已提交
436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452
				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;

453
	switch (ap_ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
J
Johannes Berg 已提交
454 455 456 457 458 459 460 461 462 463 464 465 466 467
	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;
	}

468 469 470 471 472 473 474 475 476 477
	/*
	 * 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
478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502
	/* 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);
}

503 504 505 506
/* This function determines vht capability flags for the association
 * and builds the IE.
 * Note - the function may set the owner of the MU-MIMO capability
 */
507 508
static void ieee80211_add_vht_ie(struct ieee80211_sub_if_data *sdata,
				 struct sk_buff *skb,
509 510
				 struct ieee80211_supported_band *sband,
				 struct ieee80211_vht_cap *ap_vht_cap)
511
{
512
	struct ieee80211_local *local = sdata->local;
513 514 515
	u8 *pos;
	u32 cap;
	struct ieee80211_sta_vht_cap vht_cap;
516
	u32 mask, ap_bf_sts, our_bf_sts;
517 518 519 520

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

	memcpy(&vht_cap, &sband->vht_cap, sizeof(vht_cap));
521
	ieee80211_apply_vhtcap_overrides(sdata, &vht_cap);
522 523 524 525

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

J
Johannes Berg 已提交
526
	if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_80P80MHZ) {
527 528 529 530 531 532
		u32 bw = cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;

		cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
		if (bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ ||
		    bw == IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ)
			cap |= IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ;
J
Johannes Berg 已提交
533 534 535 536
	}

	if (sdata->u.mgd.flags & IEEE80211_STA_DISABLE_160MHZ) {
		cap &= ~IEEE80211_VHT_CAP_SHORT_GI_160;
537
		cap &= ~IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK;
J
Johannes Berg 已提交
538 539
	}

540 541 542 543 544 545
	/*
	 * 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)))
546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563
		cap &= ~(IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
			 IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE);
	else if (!(ap_vht_cap->vht_cap_info &
			cpu_to_le32(IEEE80211_VHT_CAP_MU_BEAMFORMER_CAPABLE)))
		cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;

	/*
	 * If some other vif is using the MU-MIMO capablity we cannot associate
	 * using MU-MIMO - this will lead to contradictions in the group-id
	 * mechanism.
	 * Ownership is defined since association request, in order to avoid
	 * simultaneous associations with MU-MIMO.
	 */
	if (cap & IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE) {
		bool disable_mu_mimo = false;
		struct ieee80211_sub_if_data *other;

		list_for_each_entry_rcu(other, &local->interfaces, list) {
564
			if (other->vif.mu_mimo_owner) {
565 566 567 568 569 570 571
				disable_mu_mimo = true;
				break;
			}
		}
		if (disable_mu_mimo)
			cap &= ~IEEE80211_VHT_CAP_MU_BEAMFORMEE_CAPABLE;
		else
572
			sdata->vif.mu_mimo_owner = true;
573
	}
574

575 576 577 578 579 580 581 582 583 584
	mask = IEEE80211_VHT_CAP_BEAMFORMEE_STS_MASK;

	ap_bf_sts = le32_to_cpu(ap_vht_cap->vht_cap_info) & mask;
	our_bf_sts = cap & mask;

	if (ap_bf_sts < our_bf_sts) {
		cap &= ~mask;
		cap |= ap_bf_sts;
	}

585
	/* reserve and fill IE */
M
Mahesh Palivela 已提交
586
	pos = skb_put(skb, sizeof(struct ieee80211_vht_cap) + 2);
587 588 589
	ieee80211_ie_build_vht_cap(pos, &vht_cap, cap);
}

J
Johannes Berg 已提交
590 591 592 593 594 595 596 597 598
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;
599
	int i, count, rates_len, supp_rates_len, shift;
J
Johannes Berg 已提交
600 601
	u16 capab;
	struct ieee80211_supported_band *sband;
J
Johannes Berg 已提交
602 603
	struct ieee80211_chanctx_conf *chanctx_conf;
	struct ieee80211_channel *chan;
604
	u32 rates = 0;
J
Johannes Berg 已提交
605

606
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
607

J
Johannes Berg 已提交
608 609 610 611 612 613
	rcu_read_lock();
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
	if (WARN_ON(!chanctx_conf)) {
		rcu_read_unlock();
		return;
	}
614
	chan = chanctx_conf->def.chan;
J
Johannes Berg 已提交
615 616
	rcu_read_unlock();
	sband = local->hw.wiphy->bands[chan->band];
617
	shift = ieee80211_vif_get_shift(&sdata->vif);
J
Johannes Berg 已提交
618 619 620 621 622 623 624 625

	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)...
		 */
626 627 628 629
		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
630 631 632 633 634 635
	} else {
		/*
		 * In case AP not provide any supported rates information
		 * before association, we send information element(s) with
		 * all rates that we support.
		 */
636 637 638 639 640
		rates_len = 0;
		for (i = 0; i < sband->n_bitrates; i++) {
			rates |= BIT(i);
			rates_len++;
		}
J
Johannes Berg 已提交
641 642 643 644 645 646 647 648 649
	}

	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
650
			2 + sizeof(struct ieee80211_vht_cap) + /* VHT */
J
Johannes Berg 已提交
651
			assoc_data->ie_len + /* extra IEs */
652
			(assoc_data->fils_kek_len ? 16 /* AES-SIV */ : 0) +
J
Johannes Berg 已提交
653 654 655 656 657 658 659 660 661
			9, /* WMM */
			GFP_KERNEL);
	if (!skb)
		return;

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

	capab = WLAN_CAPABILITY_ESS;

662
	if (sband->band == NL80211_BAND_2GHZ) {
663 664
		capab |= WLAN_CAPABILITY_SHORT_SLOT_TIME;
		capab |= WLAN_CAPABILITY_SHORT_PREAMBLE;
J
Johannes Berg 已提交
665 666 667 668 669 670
	}

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

	if ((assoc_data->capability & WLAN_CAPABILITY_SPECTRUM_MGMT) &&
671
	    ieee80211_hw_check(&local->hw, SPECTRUM_MGMT))
J
Johannes Berg 已提交
672 673
		capab |= WLAN_CAPABILITY_SPECTRUM_MGMT;

674 675 676
	if (ifmgd->flags & IEEE80211_STA_ENABLE_RRM)
		capab |= WLAN_CAPABILITY_RADIO_MEASURE;

J
Johannes Berg 已提交
677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718
	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) {
719 720 721
			int rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
						5 * (1 << shift));
			*pos++ = (u8) rate;
J
Johannes Berg 已提交
722 723 724 725 726 727 728 729 730 731 732 733
			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) {
734 735 736 737
				int rate;
				rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
						    5 * (1 << shift));
				*pos++ = (u8) rate;
J
Johannes Berg 已提交
738 739 740 741
			}
		}
	}

742 743
	if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT ||
	    capab & WLAN_CAPABILITY_RADIO_MEASURE) {
J
Johannes Berg 已提交
744 745 746 747
		pos = skb_put(skb, 4);
		*pos++ = WLAN_EID_PWR_CAPABILITY;
		*pos++ = 2;
		*pos++ = 0; /* min tx power */
748 749
		 /* max tx power */
		*pos++ = ieee80211_chandef_max_power(&chanctx_conf->def);
750
	}
J
Johannes Berg 已提交
751

752
	if (capab & WLAN_CAPABILITY_SPECTRUM_MGMT) {
J
Johannes Berg 已提交
753 754 755 756 757 758 759 760 761 762 763 764
		/* 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 */
765
	if (assoc_data->ie_len) {
J
Johannes Berg 已提交
766 767 768 769 770 771 772 773 774 775
		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,
776 777
			WLAN_EID_FAST_BSS_TRANSITION,	/* reassoc only */
			WLAN_EID_RIC_DATA,		/* reassoc only */
J
Johannes Berg 已提交
778 779
			WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
		};
780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799
		static const u8 after_ric[] = {
			WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
			WLAN_EID_HT_CAPABILITY,
			WLAN_EID_BSS_COEX_2040,
			WLAN_EID_EXT_CAPABILITY,
			WLAN_EID_QOS_TRAFFIC_CAPA,
			WLAN_EID_TIM_BCAST_REQ,
			WLAN_EID_INTERWORKING,
			/* 60GHz doesn't happen right now */
			WLAN_EID_VHT_CAPABILITY,
			WLAN_EID_OPMODE_NOTIF,
		};

		noffset = ieee80211_ie_split_ric(assoc_data->ie,
						 assoc_data->ie_len,
						 before_ht,
						 ARRAY_SIZE(before_ht),
						 after_ric,
						 ARRAY_SIZE(after_ric),
						 offset);
J
Johannes Berg 已提交
800 801 802 803 804
		pos = skb_put(skb, noffset - offset);
		memcpy(pos, assoc_data->ie + offset, noffset - offset);
		offset = noffset;
	}

J
Johannes Berg 已提交
805 806 807 808
	if (WARN_ON_ONCE((ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
			 !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT)))
		ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;

809
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
810
		ieee80211_add_ht_ie(sdata, skb, assoc_data->ap_ht_param,
811
				    sband, chan, sdata->smps_mode);
J
Johannes Berg 已提交
812

813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832
	/* if present, add any custom IEs that go before VHT */
	if (assoc_data->ie_len) {
		static const u8 before_vht[] = {
			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,
			WLAN_EID_HT_CAPABILITY,
			WLAN_EID_BSS_COEX_2040,
			WLAN_EID_EXT_CAPABILITY,
			WLAN_EID_QOS_TRAFFIC_CAPA,
			WLAN_EID_TIM_BCAST_REQ,
			WLAN_EID_INTERWORKING,
		};
833 834

		/* RIC already taken above, so no need to handle here anymore */
835 836 837 838 839 840 841 842
		noffset = ieee80211_ie_split(assoc_data->ie, assoc_data->ie_len,
					     before_vht, ARRAY_SIZE(before_vht),
					     offset);
		pos = skb_put(skb, noffset - offset);
		memcpy(pos, assoc_data->ie + offset, noffset - offset);
		offset = noffset;
	}

843
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
844 845
		ieee80211_add_vht_ie(sdata, skb, sband,
				     &assoc_data->ap_vht_cap);
846

J
Johannes Berg 已提交
847
	/* if present, add any custom non-vendor IEs that go after HT */
848
	if (assoc_data->ie_len) {
J
Johannes Berg 已提交
849 850 851 852 853 854 855 856
		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;
	}

857 858
	if (assoc_data->wmm) {
		if (assoc_data->uapsd) {
859 860
			qos_info = ifmgd->uapsd_queues;
			qos_info |= (ifmgd->uapsd_max_sp_len <<
J
Johannes Berg 已提交
861 862 863 864 865
				     IEEE80211_WMM_IE_STA_QOSINFO_SP_SHIFT);
		} else {
			qos_info = 0;
		}

866
		pos = ieee80211_add_wmm_info_ie(skb_put(skb, 9), qos_info);
J
Johannes Berg 已提交
867 868 869
	}

	/* add any remaining custom (i.e. vendor specific here) IEs */
870
	if (assoc_data->ie_len) {
J
Johannes Berg 已提交
871 872 873 874 875
		noffset = assoc_data->ie_len;
		pos = skb_put(skb, noffset - offset);
		memcpy(pos, assoc_data->ie + offset, noffset - offset);
	}

876 877 878 879 880 881
	if (assoc_data->fils_kek_len &&
	    fils_encrypt_assoc_req(skb, assoc_data) < 0) {
		dev_kfree_skb(skb);
		return;
	}

J
Johannes Berg 已提交
882 883
	drv_mgd_prepare_tx(local, sdata);

J
Johannes Berg 已提交
884
	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
885
	if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
886 887
		IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS |
						IEEE80211_TX_INTFL_MLME_CONN_TX;
J
Johannes Berg 已提交
888 889 890
	ieee80211_tx_skb(sdata, skb);
}

891 892 893 894 895 896
void ieee80211_send_pspoll(struct ieee80211_local *local,
			   struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_pspoll *pspoll;
	struct sk_buff *skb;

897 898
	skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
	if (!skb)
899 900
		return;

901 902
	pspoll = (struct ieee80211_pspoll *) skb->data;
	pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
903

904 905
	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
	ieee80211_tx_skb(sdata, skb);
906 907
}

908 909
void ieee80211_send_nullfunc(struct ieee80211_local *local,
			     struct ieee80211_sub_if_data *sdata,
910
			     bool powersave)
911 912
{
	struct sk_buff *skb;
913
	struct ieee80211_hdr_3addr *nullfunc;
914
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
915

916 917
	skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
	if (!skb)
918 919
		return;

920
	nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
921
	if (powersave)
922
		nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
923

924 925
	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
					IEEE80211_TX_INTFL_OFFCHAN_TX_OK;
926

927
	if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
928 929
		IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;

930
	if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
931 932
		IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;

933
	ieee80211_tx_skb(sdata, skb);
934 935
}

936 937 938 939 940 941 942 943 944 945 946
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);
947
	if (!skb)
948
		return;
949

950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965
	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);
}

966 967 968 969 970
/* 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);
971
	struct ieee80211_local *local = sdata->local;
972
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
973
	int ret;
974

975
	if (!ieee80211_sdata_running(sdata))
976 977
		return;

978
	sdata_lock(sdata);
979 980 981
	mutex_lock(&local->mtx);
	mutex_lock(&local->chanctx_mtx);

982 983
	if (!ifmgd->associated)
		goto out;
984

985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018
	if (!sdata->vif.csa_active)
		goto out;

	/*
	 * using reservation isn't immediate as it may be deferred until later
	 * with multi-vif. once reservation is complete it will re-schedule the
	 * work with no reserved_chanctx so verify chandef to check if it
	 * completed successfully
	 */

	if (sdata->reserved_chanctx) {
		/*
		 * with multi-vif csa driver may call ieee80211_csa_finish()
		 * many times while waiting for other interfaces to use their
		 * reservations
		 */
		if (sdata->reserved_ready)
			goto out;

		ret = ieee80211_vif_use_reserved_context(sdata);
		if (ret) {
			sdata_info(sdata,
				   "failed to use reserved channel context, disconnecting (err=%d)\n",
				   ret);
			ieee80211_queue_work(&sdata->local->hw,
					     &ifmgd->csa_connection_drop_work);
			goto out;
		}

		goto out;
	}

	if (!cfg80211_chandef_identical(&sdata->vif.bss_conf.chandef,
					&sdata->csa_chandef)) {
1019
		sdata_info(sdata,
1020
			   "failed to finalize channel switch, disconnecting\n");
1021 1022 1023 1024
		ieee80211_queue_work(&sdata->local->hw,
				     &ifmgd->csa_connection_drop_work);
		goto out;
	}
1025

1026
	/* XXX: shouldn't really modify cfg80211-owned data! */
1027
	ifmgd->associated->channel = sdata->csa_chandef.chan;
1028

1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048
	ifmgd->csa_waiting_bcn = true;

	ieee80211_sta_reset_beacon_monitor(sdata);
	ieee80211_sta_reset_conn_monitor(sdata);

out:
	mutex_unlock(&local->chanctx_mtx);
	mutex_unlock(&local->mtx);
	sdata_unlock(sdata);
}

static void ieee80211_chswitch_post_beacon(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	int ret;

	sdata_assert_lock(sdata);

	WARN_ON(!sdata->vif.csa_active);
1049

1050 1051 1052 1053 1054
	if (sdata->csa_block_tx) {
		ieee80211_wake_vif_queues(local, sdata,
					  IEEE80211_QUEUE_STOP_REASON_CSA);
		sdata->csa_block_tx = false;
	}
1055

1056 1057 1058
	sdata->vif.csa_active = false;
	ifmgd->csa_waiting_bcn = false;

1059 1060 1061 1062 1063 1064
	ret = drv_post_channel_switch(sdata);
	if (ret) {
		sdata_info(sdata,
			   "driver post channel switch failed, disconnecting\n");
		ieee80211_queue_work(&local->hw,
				     &ifmgd->csa_connection_drop_work);
1065
		return;
1066
	}
1067 1068

	cfg80211_ch_switch_notify(sdata->dev, &sdata->reserved_chandef);
1069 1070
}

1071 1072
void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
{
J
Johannes Berg 已提交
1073 1074
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1075 1076 1077

	trace_api_chswitch_done(sdata, success);
	if (!success) {
1078 1079 1080 1081 1082 1083
		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);
1084 1085 1086 1087
	}
}
EXPORT_SYMBOL(ieee80211_chswitch_done);

1088 1089 1090 1091
static void ieee80211_chswitch_timer(unsigned long data)
{
	struct ieee80211_sub_if_data *sdata =
		(struct ieee80211_sub_if_data *) data;
1092

1093
	ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.chswitch_work);
1094 1095
}

1096
static void
J
Johannes Berg 已提交
1097
ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
1098 1099
				 u64 timestamp, u32 device_timestamp,
				 struct ieee802_11_elems *elems,
1100
				 bool beacon)
1101
{
1102
	struct ieee80211_local *local = sdata->local;
1103
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1104
	struct cfg80211_bss *cbss = ifmgd->associated;
1105
	struct ieee80211_chanctx_conf *conf;
J
Johannes Berg 已提交
1106
	struct ieee80211_chanctx *chanctx;
1107
	enum nl80211_band current_band;
1108
	struct ieee80211_csa_ie csa_ie;
1109
	struct ieee80211_channel_switch ch_switch;
1110
	int res;
1111

1112
	sdata_assert_lock(sdata);
1113

1114
	if (!cbss)
1115 1116
		return;

1117
	if (local->scanning)
1118 1119
		return;

1120
	/* disregard subsequent announcements if we are already processing */
1121
	if (sdata->vif.csa_active)
1122 1123
		return;

1124
	current_band = cbss->channel->band;
1125
	memset(&csa_ie, 0, sizeof(csa_ie));
1126
	res = ieee80211_parse_ch_switch_ie(sdata, elems, current_band,
1127
					   ifmgd->flags,
1128
					   ifmgd->associated->bssid, &csa_ie);
1129
	if (res	< 0)
1130
		ieee80211_queue_work(&local->hw,
1131
				     &ifmgd->csa_connection_drop_work);
1132
	if (res)
1133
		return;
1134

1135
	if (!cfg80211_chandef_usable(local->hw.wiphy, &csa_ie.chandef,
1136 1137 1138
				     IEEE80211_CHAN_DISABLED)) {
		sdata_info(sdata,
			   "AP %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), disconnecting\n",
1139
			   ifmgd->associated->bssid,
1140 1141 1142
			   csa_ie.chandef.chan->center_freq,
			   csa_ie.chandef.width, csa_ie.chandef.center_freq1,
			   csa_ie.chandef.center_freq2);
1143 1144 1145 1146 1147
		ieee80211_queue_work(&local->hw,
				     &ifmgd->csa_connection_drop_work);
		return;
	}

1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158
	if (cfg80211_chandef_identical(&csa_ie.chandef,
				       &sdata->vif.bss_conf.chandef)) {
		if (ifmgd->csa_ignored_same_chan)
			return;
		sdata_info(sdata,
			   "AP %pM tries to chanswitch to same channel, ignore\n",
			   ifmgd->associated->bssid);
		ifmgd->csa_ignored_same_chan = true;
		return;
	}

1159 1160 1161 1162 1163 1164 1165 1166
	/*
	 * Drop all TDLS peers - either we disconnect or move to a different
	 * channel from this point on. There's no telling what our peer will do.
	 * The TDLS WIDER_BW scenario is also problematic, as peers might now
	 * have an incompatible wider chandef.
	 */
	ieee80211_teardown_tdls_peers(sdata);

1167
	mutex_lock(&local->mtx);
1168
	mutex_lock(&local->chanctx_mtx);
1169 1170 1171 1172 1173
	conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
					 lockdep_is_held(&local->chanctx_mtx));
	if (!conf) {
		sdata_info(sdata,
			   "no channel context assigned to vif?, disconnecting\n");
1174
		goto drop_connection;
1175 1176 1177 1178
	}

	chanctx = container_of(conf, struct ieee80211_chanctx, conf);

1179
	if (local->use_chanctx &&
1180
	    !ieee80211_hw_check(&local->hw, CHANCTX_STA_CSA)) {
1181 1182
		sdata_info(sdata,
			   "driver doesn't support chan-switch with channel contexts\n");
1183
		goto drop_connection;
J
Johannes Berg 已提交
1184 1185
	}

1186 1187 1188 1189 1190 1191 1192 1193 1194
	ch_switch.timestamp = timestamp;
	ch_switch.device_timestamp = device_timestamp;
	ch_switch.block_tx = csa_ie.mode;
	ch_switch.chandef = csa_ie.chandef;
	ch_switch.count = csa_ie.count;

	if (drv_pre_channel_switch(sdata, &ch_switch)) {
		sdata_info(sdata,
			   "preparing for channel switch failed, disconnecting\n");
1195
		goto drop_connection;
1196 1197
	}

1198 1199 1200
	res = ieee80211_vif_reserve_chanctx(sdata, &csa_ie.chandef,
					    chanctx->mode, false);
	if (res) {
J
Johannes Berg 已提交
1201
		sdata_info(sdata,
1202 1203
			   "failed to reserve channel context for channel switch, disconnecting (err=%d)\n",
			   res);
1204
		goto drop_connection;
J
Johannes Berg 已提交
1205
	}
1206
	mutex_unlock(&local->chanctx_mtx);
J
Johannes Berg 已提交
1207

1208
	sdata->vif.csa_active = true;
1209
	sdata->csa_chandef = csa_ie.chandef;
1210
	sdata->csa_block_tx = csa_ie.mode;
1211
	ifmgd->csa_ignored_same_chan = false;
J
Johannes Berg 已提交
1212

1213
	if (sdata->csa_block_tx)
1214 1215
		ieee80211_stop_vif_queues(local, sdata,
					  IEEE80211_QUEUE_STOP_REASON_CSA);
1216
	mutex_unlock(&local->mtx);
1217

1218 1219 1220
	cfg80211_ch_switch_started_notify(sdata->dev, &csa_ie.chandef,
					  csa_ie.count);

1221
	if (local->ops->channel_switch) {
1222
		/* use driver's channel switch callback */
1223
		drv_channel_switch(local, sdata, &ch_switch);
1224 1225 1226 1227
		return;
	}

	/* channel switch handled in software */
1228
	if (csa_ie.count <= 1)
1229
		ieee80211_queue_work(&local->hw, &ifmgd->chswitch_work);
1230
	else
1231
		mod_timer(&ifmgd->chswitch_timer,
1232 1233
			  TU_TO_EXP_TIME((csa_ie.count - 1) *
					 cbss->beacon_interval));
1234 1235 1236 1237 1238
	return;
 drop_connection:
	ieee80211_queue_work(&local->hw, &ifmgd->csa_connection_drop_work);
	mutex_unlock(&local->chanctx_mtx);
	mutex_unlock(&local->mtx);
1239 1240
}

1241 1242 1243 1244 1245 1246
static bool
ieee80211_find_80211h_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,
				 int *chan_pwr, int *pwr_reduction)
1247
{
1248 1249
	struct ieee80211_country_ie_triplet *triplet;
	int chan = ieee80211_frequency_to_channel(channel->center_freq);
1250
	int i, chan_increment;
1251
	bool have_chan_pwr = false;
1252

1253 1254
	/* Invalid IE */
	if (country_ie_len % 2 || country_ie_len < IEEE80211_COUNTRY_IE_MIN_LEN)
1255
		return false;
1256

1257 1258 1259 1260 1261 1262 1263
	triplet = (void *)(country_ie + 3);
	country_ie_len -= 3;

	switch (channel->band) {
	default:
		WARN_ON_ONCE(1);
		/* fall through */
1264 1265
	case NL80211_BAND_2GHZ:
	case NL80211_BAND_60GHZ:
1266 1267
		chan_increment = 1;
		break;
1268
	case NL80211_BAND_5GHZ:
1269 1270
		chan_increment = 4;
		break;
1271
	}
1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282

	/* 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;
1283
				*chan_pwr = triplet->chans.max_power;
1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294
				break;
			}
		}
		if (have_chan_pwr)
			break;

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

1295
	if (have_chan_pwr && pwr_constr_elem)
1296
		*pwr_reduction = *pwr_constr_elem;
1297 1298 1299
	else
		*pwr_reduction = 0;

1300 1301 1302
	return have_chan_pwr;
}

1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316
static void ieee80211_find_cisco_dtpc(struct ieee80211_sub_if_data *sdata,
				      struct ieee80211_channel *channel,
				      const u8 *cisco_dtpc_ie,
				      int *pwr_level)
{
	/* From practical testing, the first data byte of the DTPC element
	 * seems to contain the requested dBm level, and the CLI on Cisco
	 * APs clearly state the range is -127 to 127 dBm, which indicates
	 * a signed byte, although it seemingly never actually goes negative.
	 * The other byte seems to always be zero.
	 */
	*pwr_level = (__s8)cisco_dtpc_ie[4];
}

1317 1318 1319 1320
static u32 ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
				       struct ieee80211_channel *channel,
				       struct ieee80211_mgmt *mgmt,
				       const u8 *country_ie, u8 country_ie_len,
1321 1322
				       const u8 *pwr_constr_ie,
				       const u8 *cisco_dtpc_ie)
1323
{
1324 1325 1326
	bool has_80211h_pwr = false, has_cisco_pwr = false;
	int chan_pwr = 0, pwr_reduction_80211h = 0;
	int pwr_level_cisco, pwr_level_80211h;
1327
	int new_ap_level;
1328
	__le16 capab = mgmt->u.probe_resp.capab_info;
1329

1330 1331 1332
	if (country_ie &&
	    (capab & cpu_to_le16(WLAN_CAPABILITY_SPECTRUM_MGMT) ||
	     capab & cpu_to_le16(WLAN_CAPABILITY_RADIO_MEASURE))) {
1333 1334 1335
		has_80211h_pwr = ieee80211_find_80211h_pwr_constr(
			sdata, channel, country_ie, country_ie_len,
			pwr_constr_ie, &chan_pwr, &pwr_reduction_80211h);
1336 1337 1338 1339 1340 1341 1342 1343
		pwr_level_80211h =
			max_t(int, 0, chan_pwr - pwr_reduction_80211h);
	}

	if (cisco_dtpc_ie) {
		ieee80211_find_cisco_dtpc(
			sdata, channel, cisco_dtpc_ie, &pwr_level_cisco);
		has_cisco_pwr = true;
1344
	}
1345

1346
	if (!has_80211h_pwr && !has_cisco_pwr)
1347
		return 0;
1348

1349 1350 1351 1352 1353
	/* If we have both 802.11h and Cisco DTPC, apply both limits
	 * by picking the smallest of the two power levels advertised.
	 */
	if (has_80211h_pwr &&
	    (!has_cisco_pwr || pwr_level_80211h <= pwr_level_cisco)) {
1354 1355 1356 1357 1358
		new_ap_level = pwr_level_80211h;

		if (sdata->ap_power_level == new_ap_level)
			return 0;

1359 1360 1361 1362
		sdata_dbg(sdata,
			  "Limiting TX power to %d (%d - %d) dBm as advertised by %pM\n",
			  pwr_level_80211h, chan_pwr, pwr_reduction_80211h,
			  sdata->u.mgd.bssid);
1363
	} else {  /* has_cisco_pwr is always true here. */
1364 1365 1366 1367 1368
		new_ap_level = pwr_level_cisco;

		if (sdata->ap_power_level == new_ap_level)
			return 0;

1369 1370 1371
		sdata_dbg(sdata,
			  "Limiting TX power to %d dBm as advertised by %pM\n",
			  pwr_level_cisco, sdata->u.mgd.bssid);
1372
	}
1373

1374 1375 1376 1377
	sdata->ap_power_level = new_ap_level;
	if (__ieee80211_recalc_txpower(sdata))
		return BSS_CHANGED_TXPOWER;
	return 0;
1378 1379
}

1380 1381 1382 1383 1384 1385
/* 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
1386 1387 1388 1389
	/*
	 * If we are scanning right now then the parameters will
	 * take effect when scan finishes.
	 */
1390
	if (local->scanning)
J
Johannes Berg 已提交
1391 1392
		return;

1393
	if (conf->dynamic_ps_timeout > 0 &&
1394
	    !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS)) {
1395 1396 1397
		mod_timer(&local->dynamic_ps_timer, jiffies +
			  msecs_to_jiffies(conf->dynamic_ps_timeout));
	} else {
1398
		if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK))
1399
			ieee80211_send_nullfunc(local, sdata, true);
1400

1401 1402
		if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
		    ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
1403 1404 1405 1406
			return;

		conf->flags |= IEEE80211_CONF_PS;
		ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423
	}
}

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);
	}
}

1424 1425 1426 1427
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
1428
	bool authorized = false;
1429 1430 1431 1432

	if (!mgd->powersave)
		return false;

1433 1434 1435
	if (mgd->broken_ap)
		return false;

1436 1437 1438
	if (!mgd->associated)
		return false;

1439
	if (mgd->flags & IEEE80211_STA_CONNECTION_POLL)
1440 1441
		return false;

1442
	if (!mgd->have_beacon)
1443 1444
		return false;

1445 1446 1447
	rcu_read_lock();
	sta = sta_info_get(sdata, mgd->bssid);
	if (sta)
J
Johannes Berg 已提交
1448
		authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
1449 1450
	rcu_read_unlock();

J
Johannes Berg 已提交
1451
	return authorized;
1452 1453
}

1454
/* need to hold RTNL or interface lock */
J
Johannes Berg 已提交
1455
void ieee80211_recalc_ps(struct ieee80211_local *local)
1456 1457 1458
{
	struct ieee80211_sub_if_data *sdata, *found = NULL;
	int count = 0;
1459
	int timeout;
1460

1461
	if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS)) {
1462 1463 1464 1465 1466
		local->ps_sdata = NULL;
		return;
	}

	list_for_each_entry(sdata, &local->interfaces, list) {
1467
		if (!ieee80211_sdata_running(sdata))
1468
			continue;
1469 1470 1471 1472 1473 1474 1475 1476
		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;
		}
1477 1478 1479 1480 1481 1482
		if (sdata->vif.type != NL80211_IFTYPE_STATION)
			continue;
		found = sdata;
		count++;
	}

1483
	if (count == 1 && ieee80211_powersave_allowed(found)) {
J
Johannes Berg 已提交
1484
		u8 dtimper = found->u.mgd.dtim_period;
1485

1486
		timeout = local->dynamic_ps_forced_timeout;
J
Johannes Berg 已提交
1487 1488
		if (timeout < 0)
			timeout = 100;
1489
		local->hw.conf.dynamic_ps_timeout = timeout;
1490

J
Johannes Berg 已提交
1491 1492 1493 1494 1495 1496
		/* If the TIM IE is invalid, pretend the value is 1 */
		if (!dtimper)
			dtimper = 1;

		local->hw.conf.ps_dtim_period = dtimper;
		local->ps_sdata = found;
1497
	} else {
1498
		local->ps_sdata = NULL;
1499
	}
1500 1501 1502 1503

	ieee80211_change_ps(local);
}

E
Eliad Peller 已提交
1504 1505 1506 1507 1508 1509 1510 1511 1512 1513
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);
	}
}

1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525
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,
1526
					IEEE80211_MAX_QUEUE_MAP,
1527 1528
					IEEE80211_QUEUE_STOP_REASON_PS,
					false);
1529 1530 1531 1532 1533 1534 1535 1536
}

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;
1537
	struct ieee80211_if_managed *ifmgd;
1538 1539
	unsigned long flags;
	int q;
1540 1541 1542 1543 1544

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

1545 1546
	ifmgd = &sdata->u.mgd;

1547 1548 1549
	if (local->hw.conf.flags & IEEE80211_CONF_PS)
		return;

1550
	if (local->hw.conf.dynamic_ps_timeout > 0) {
1551 1552
		/* don't enter PS if TX frames are pending */
		if (drv_tx_frames_pending(local)) {
1553 1554 1555 1556 1557
			mod_timer(&local->dynamic_ps_timer, jiffies +
				  msecs_to_jiffies(
				  local->hw.conf.dynamic_ps_timeout));
			return;
		}
1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575

		/*
		 * 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);
1576 1577
	}

1578
	if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
1579
	    !(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
1580
		if (drv_tx_frames_pending(local)) {
1581 1582 1583
			mod_timer(&local->dynamic_ps_timer, jiffies +
				  msecs_to_jiffies(
				  local->hw.conf.dynamic_ps_timeout));
1584
		} else {
1585
			ieee80211_send_nullfunc(local, sdata, true);
1586
			/* Flush to get the tx status of nullfunc frame */
1587
			ieee80211_flush_queues(local, sdata, false);
1588
		}
1589 1590
	}

1591 1592
	if (!(ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS) &&
	      ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK)) ||
1593 1594 1595 1596 1597
	    (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);
	}
1598 1599 1600 1601 1602 1603
}

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

1604
	ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
1605 1606
}

1607 1608
void ieee80211_dfs_cac_timer_work(struct work_struct *work)
{
1609
	struct delayed_work *delayed_work = to_delayed_work(work);
1610 1611 1612
	struct ieee80211_sub_if_data *sdata =
		container_of(delayed_work, struct ieee80211_sub_if_data,
			     dfs_cac_timer_work);
1613
	struct cfg80211_chan_def chandef = sdata->vif.bss_conf.chandef;
1614

1615 1616 1617 1618 1619 1620 1621 1622
	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);
1623 1624
}

1625 1626 1627 1628 1629
static bool
__ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1630
	bool ret = false;
1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674
	int ac;

	if (local->hw.queues < IEEE80211_NUM_ACS)
		return false;

	for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
		struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
		int non_acm_ac;
		unsigned long now = jiffies;

		if (tx_tspec->action == TX_TSPEC_ACTION_NONE &&
		    tx_tspec->admitted_time &&
		    time_after(now, tx_tspec->time_slice_start + HZ)) {
			tx_tspec->consumed_tx_time = 0;
			tx_tspec->time_slice_start = now;

			if (tx_tspec->downgraded)
				tx_tspec->action =
					TX_TSPEC_ACTION_STOP_DOWNGRADE;
		}

		switch (tx_tspec->action) {
		case TX_TSPEC_ACTION_STOP_DOWNGRADE:
			/* take the original parameters */
			if (drv_conf_tx(local, sdata, ac, &sdata->tx_conf[ac]))
				sdata_err(sdata,
					  "failed to set TX queue parameters for queue %d\n",
					  ac);
			tx_tspec->action = TX_TSPEC_ACTION_NONE;
			tx_tspec->downgraded = false;
			ret = true;
			break;
		case TX_TSPEC_ACTION_DOWNGRADE:
			if (time_after(now, tx_tspec->time_slice_start + HZ)) {
				tx_tspec->action = TX_TSPEC_ACTION_NONE;
				ret = true;
				break;
			}
			/* downgrade next lower non-ACM AC */
			for (non_acm_ac = ac + 1;
			     non_acm_ac < IEEE80211_NUM_ACS;
			     non_acm_ac++)
				if (!(sdata->wmm_acm & BIT(7 - 2 * non_acm_ac)))
					break;
1675 1676 1677 1678 1679 1680
			/* Usually the loop will result in using BK even if it
			 * requires admission control, but such a configuration
			 * makes no sense and we have to transmit somehow - the
			 * AC selection does the same thing.
			 * If we started out trying to downgrade from BK, then
			 * the extra condition here might be needed.
1681
			 */
1682 1683
			if (non_acm_ac >= IEEE80211_NUM_ACS)
				non_acm_ac = IEEE80211_AC_BK;
1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717
			if (drv_conf_tx(local, sdata, ac,
					&sdata->tx_conf[non_acm_ac]))
				sdata_err(sdata,
					  "failed to set TX queue parameters for queue %d\n",
					  ac);
			tx_tspec->action = TX_TSPEC_ACTION_NONE;
			ret = true;
			schedule_delayed_work(&ifmgd->tx_tspec_wk,
				tx_tspec->time_slice_start + HZ - now + 1);
			break;
		case TX_TSPEC_ACTION_NONE:
			/* nothing now */
			break;
		}
	}

	return ret;
}

void ieee80211_sta_handle_tspec_ac_params(struct ieee80211_sub_if_data *sdata)
{
	if (__ieee80211_sta_handle_tspec_ac_params(sdata))
		ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
}

static void ieee80211_sta_handle_tspec_ac_params_wk(struct work_struct *work)
{
	struct ieee80211_sub_if_data *sdata;

	sdata = container_of(work, struct ieee80211_sub_if_data,
			     u.mgd.tx_tspec_wk.work);
	ieee80211_sta_handle_tspec_ac_params(sdata);
}

J
Johannes Berg 已提交
1718
/* MLME */
1719
static bool ieee80211_sta_wmm_params(struct ieee80211_local *local,
1720
				     struct ieee80211_sub_if_data *sdata,
J
Johannes Berg 已提交
1721
				     const u8 *wmm_param, size_t wmm_param_len)
1722
{
1723
	struct ieee80211_tx_queue_params params[IEEE80211_NUM_ACS];
1724
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1725
	size_t left;
1726
	int count, ac;
J
Johannes Berg 已提交
1727 1728
	const u8 *pos;
	u8 uapsd_queues = 0;
1729

1730
	if (!local->ops->conf_tx)
1731
		return false;
1732

J
Johannes Berg 已提交
1733
	if (local->hw.queues < IEEE80211_NUM_ACS)
1734
		return false;
1735 1736

	if (!wmm_param)
1737
		return false;
1738

1739
	if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
1740
		return false;
K
Kalle Valo 已提交
1741 1742

	if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
1743
		uapsd_queues = ifmgd->uapsd_queues;
K
Kalle Valo 已提交
1744

1745
	count = wmm_param[6] & 0x0f;
1746
	if (count == ifmgd->wmm_last_param_set)
1747
		return false;
1748
	ifmgd->wmm_last_param_set = count;
1749 1750 1751 1752 1753 1754

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

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

Y
Yoni Divinsky 已提交
1755
	sdata->wmm_acm = 0;
1756 1757 1758
	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
1759
		bool uapsd = false;
1760 1761

		switch (aci) {
1762
		case 1: /* AC_BK */
1763
			ac = IEEE80211_AC_BK;
J
Johannes Berg 已提交
1764
			if (acm)
Y
Yoni Divinsky 已提交
1765
				sdata->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
K
Kalle Valo 已提交
1766 1767
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
				uapsd = true;
1768
			break;
1769
		case 2: /* AC_VI */
1770
			ac = IEEE80211_AC_VI;
J
Johannes Berg 已提交
1771
			if (acm)
Y
Yoni Divinsky 已提交
1772
				sdata->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
K
Kalle Valo 已提交
1773 1774
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
				uapsd = true;
1775
			break;
1776
		case 3: /* AC_VO */
1777
			ac = IEEE80211_AC_VO;
J
Johannes Berg 已提交
1778
			if (acm)
Y
Yoni Divinsky 已提交
1779
				sdata->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
K
Kalle Valo 已提交
1780 1781
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
				uapsd = true;
1782
			break;
1783
		case 0: /* AC_BE */
1784
		default:
1785
			ac = IEEE80211_AC_BE;
J
Johannes Berg 已提交
1786
			if (acm)
Y
Yoni Divinsky 已提交
1787
				sdata->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
K
Kalle Valo 已提交
1788 1789
			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
				uapsd = true;
1790 1791 1792
			break;
		}

1793
		params[ac].aifs = pos[0] & 0x0f;
1794

1795
		if (params[ac].aifs < 2) {
1796 1797
			sdata_info(sdata,
				   "AP has invalid WMM params (AIFSN=%d for ACI %d), will use 2\n",
1798 1799
				   params[ac].aifs, aci);
			params[ac].aifs = 2;
1800
		}
1801 1802 1803 1804 1805
		params[ac].cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
		params[ac].cw_min = ecw2cw(pos[1] & 0x0f);
		params[ac].txop = get_unaligned_le16(pos + 2);
		params[ac].acm = acm;
		params[ac].uapsd = uapsd;
K
Kalle Valo 已提交
1806

1807 1808 1809 1810 1811 1812 1813 1814 1815
		if (params[ac].cw_min > params[ac].cw_max) {
			sdata_info(sdata,
				   "AP has invalid WMM params (CWmin/max=%d/%d for ACI %d), using defaults\n",
				   params[ac].cw_min, params[ac].cw_max, aci);
			return false;
		}
	}

	for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
J
Johannes Berg 已提交
1816
		mlme_dbg(sdata,
1817 1818 1819 1820 1821 1822 1823 1824
			 "WMM AC=%d acm=%d aifs=%d cWmin=%d cWmax=%d txop=%d uapsd=%d, downgraded=%d\n",
			 ac, params[ac].acm,
			 params[ac].aifs, params[ac].cw_min, params[ac].cw_max,
			 params[ac].txop, params[ac].uapsd,
			 ifmgd->tx_tspec[ac].downgraded);
		sdata->tx_conf[ac] = params[ac];
		if (!ifmgd->tx_tspec[ac].downgraded &&
		    drv_conf_tx(local, sdata, ac, &params[ac]))
J
Johannes Berg 已提交
1825
			sdata_err(sdata,
1826 1827
				  "failed to set TX queue parameters for AC %d\n",
				  ac);
1828
	}
1829 1830

	/* enable WMM or activate new settings */
1831
	sdata->vif.bss_conf.qos = true;
1832
	return true;
1833 1834
}

1835 1836 1837 1838
static void __ieee80211_stop_poll(struct ieee80211_sub_if_data *sdata)
{
	lockdep_assert_held(&sdata->local->mtx);

1839
	sdata->u.mgd.flags &= ~IEEE80211_STA_CONNECTION_POLL;
1840 1841 1842 1843 1844 1845 1846 1847 1848 1849
	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
1850 1851
static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
					   u16 capab, bool erp_valid, u8 erp)
1852
{
J
Johannes Berg 已提交
1853
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1854
	struct ieee80211_supported_band *sband;
1855
	u32 changed = 0;
J
Johannes Berg 已提交
1856 1857 1858 1859
	bool use_protection;
	bool use_short_preamble;
	bool use_short_slot;

1860 1861 1862 1863
	sband = ieee80211_get_sband(sdata);
	if (!sband)
		return changed;

J
Johannes Berg 已提交
1864 1865 1866 1867 1868 1869 1870 1871 1872
	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);
1873
	if (sband->band == NL80211_BAND_5GHZ)
1874
		use_short_slot = true;
1875

1876 1877 1878
	if (use_protection != bss_conf->use_cts_prot) {
		bss_conf->use_cts_prot = use_protection;
		changed |= BSS_CHANGED_ERP_CTS_PROT;
1879
	}
1880

1881 1882
	if (use_short_preamble != bss_conf->use_short_preamble) {
		bss_conf->use_short_preamble = use_short_preamble;
1883
		changed |= BSS_CHANGED_ERP_PREAMBLE;
1884
	}
1885

J
Johannes Berg 已提交
1886 1887 1888
	if (use_short_slot != bss_conf->use_short_slot) {
		bss_conf->use_short_slot = use_short_slot;
		changed |= BSS_CHANGED_ERP_SLOT;
1889 1890 1891 1892 1893
	}

	return changed;
}

1894
static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
1895
				     struct cfg80211_bss *cbss,
J
Johannes Berg 已提交
1896
				     u32 bss_info_changed)
1897
{
1898
	struct ieee80211_bss *bss = (void *)cbss->priv;
1899
	struct ieee80211_local *local = sdata->local;
1900
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1901

J
Johannes Berg 已提交
1902
	bss_info_changed |= BSS_CHANGED_ASSOC;
1903
	bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1904
		bss_conf->assoc_capability, bss->has_erp_value, bss->erp_value);
1905

1906
	sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1907
		beacon_loss_count * bss_conf->beacon_int));
1908

1909 1910
	sdata->u.mgd.associated = cbss;
	memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1911

1912 1913
	ieee80211_check_rate_mask(sdata);

1914 1915
	sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;

1916 1917
	if (sdata->vif.p2p ||
	    sdata->vif.driver_flags & IEEE80211_VIF_GET_NOA_UPDATE) {
1918
		const struct cfg80211_bss_ies *ies;
1919

1920 1921 1922 1923 1924 1925 1926 1927
		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
1928 1929
					(u8 *) &bss_conf->p2p_noa_attr,
					sizeof(bss_conf->p2p_noa_attr));
1930
			if (ret >= 2) {
J
Janusz Dziedzic 已提交
1931 1932
				sdata->u.mgd.p2p_noa_index =
					bss_conf->p2p_noa_attr.index;
1933 1934
				bss_info_changed |= BSS_CHANGED_P2P_PS;
			}
1935
		}
1936
		rcu_read_unlock();
1937 1938
	}

J
Johannes Berg 已提交
1939
	/* just to be sure */
1940
	ieee80211_stop_poll(sdata);
J
Johannes Berg 已提交
1941

1942
	ieee80211_led_assoc(local, 1);
1943

1944
	if (sdata->u.mgd.have_beacon) {
1945 1946 1947 1948 1949 1950 1951
		/*
		 * 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;
1952
		bss_conf->beacon_rate = bss->beacon_rate;
1953
		bss_info_changed |= BSS_CHANGED_BEACON_INFO;
1954
	} else {
1955
		bss_conf->beacon_rate = NULL;
1956
		bss_conf->dtim_period = 0;
1957
	}
1958

1959
	bss_conf->assoc = 1;
1960

1961
	/* Tell the driver to monitor connection quality (if supported) */
1962
	if (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI &&
1963
	    bss_conf->cqm_rssi_thold)
1964 1965
		bss_info_changed |= BSS_CHANGED_CQM;

1966
	/* Enable ARP filtering */
1967
	if (bss_conf->arp_addr_cnt)
1968 1969
		bss_info_changed |= BSS_CHANGED_ARP_FILTER;

J
Johannes Berg 已提交
1970
	ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1971

J
Johannes Berg 已提交
1972
	mutex_lock(&local->iflist_mtx);
J
Johannes Berg 已提交
1973
	ieee80211_recalc_ps(local);
J
Johannes Berg 已提交
1974
	mutex_unlock(&local->iflist_mtx);
1975

1976
	ieee80211_recalc_smps(sdata);
E
Eliad Peller 已提交
1977 1978
	ieee80211_recalc_ps_vif(sdata);

1979
	netif_carrier_on(sdata->dev);
1980 1981
}

1982
static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1983 1984
				   u16 stype, u16 reason, bool tx,
				   u8 *frame_buf)
1985
{
1986
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1987
	struct ieee80211_local *local = sdata->local;
1988
	u32 changed = 0;
1989

1990
	sdata_assert_lock(sdata);
1991

1992 1993 1994
	if (WARN_ON_ONCE(tx && !frame_buf))
		return;

J
Johannes Berg 已提交
1995 1996 1997
	if (WARN_ON(!ifmgd->associated))
		return;

1998 1999
	ieee80211_stop_poll(sdata);

2000
	ifmgd->associated = NULL;
2001 2002
	netif_carrier_off(sdata->dev);

2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013
	/*
	 * 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
2014 2015 2016
	/* disable per-vif ps */
	ieee80211_recalc_ps_vif(sdata);

2017 2018 2019
	/* make sure ongoing transmission finishes */
	synchronize_net();

2020 2021 2022 2023 2024 2025
	/*
	 * drop any frame before deauth/disassoc, this can be data or
	 * management frame. Since we are disconnecting, we should not
	 * insist sending these frames which can take time and delay
	 * the disconnection and possible the roaming.
	 */
2026
	if (tx)
2027
		ieee80211_flush_queues(local, sdata, true);
2028

2029 2030
	/* deauthenticate/disassociate now */
	if (tx || frame_buf)
2031 2032
		ieee80211_send_deauth_disassoc(sdata, ifmgd->bssid, stype,
					       reason, tx, frame_buf);
2033

2034
	/* flush out frame - make sure the deauth was actually sent */
2035
	if (tx)
2036
		ieee80211_flush_queues(local, sdata, false);
2037

2038
	/* clear bssid only after building the needed mgmt frames */
2039
	eth_zero_addr(ifmgd->bssid);
2040

2041
	/* remove AP and TDLS peers */
2042
	sta_info_flush(sdata);
2043 2044

	/* finally reset all BSS / config parameters */
2045 2046 2047
	changed |= ieee80211_reset_erp_info(sdata);

	ieee80211_led_assoc(local, 0);
J
Johannes Berg 已提交
2048 2049
	changed |= BSS_CHANGED_ASSOC;
	sdata->vif.bss_conf.assoc = false;
2050

J
Janusz Dziedzic 已提交
2051 2052 2053
	ifmgd->p2p_noa_index = -1;
	memset(&sdata->vif.bss_conf.p2p_noa_attr, 0,
	       sizeof(sdata->vif.bss_conf.p2p_noa_attr));
2054

2055
	/* on the next assoc, re-program HT/VHT parameters */
B
Ben Greear 已提交
2056 2057
	memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
	memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
2058 2059
	memset(&ifmgd->vht_capa, 0, sizeof(ifmgd->vht_capa));
	memset(&ifmgd->vht_capa_mask, 0, sizeof(ifmgd->vht_capa_mask));
2060 2061 2062 2063 2064 2065 2066

	/* reset MU-MIMO ownership and group data */
	memset(sdata->vif.bss_conf.mu_group.membership, 0,
	       sizeof(sdata->vif.bss_conf.mu_group.membership));
	memset(sdata->vif.bss_conf.mu_group.position, 0,
	       sizeof(sdata->vif.bss_conf.mu_group.position));
	changed |= BSS_CHANGED_MU_GROUPS;
2067
	sdata->vif.mu_mimo_owner = false;
2068

2069
	sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2070

2071 2072 2073
	del_timer_sync(&local->dynamic_ps_timer);
	cancel_work_sync(&local->dynamic_ps_enable_work);

2074
	/* Disable ARP filtering */
2075
	if (sdata->vif.bss_conf.arp_addr_cnt)
2076 2077
		changed |= BSS_CHANGED_ARP_FILTER;

2078 2079 2080
	sdata->vif.bss_conf.qos = false;
	changed |= BSS_CHANGED_QOS;

2081 2082
	/* The BSSID (not really interesting) and HT changed */
	changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
J
Johannes Berg 已提交
2083
	ieee80211_bss_info_change_notify(sdata, changed);
2084

2085
	/* disassociated - set to defaults now */
2086
	ieee80211_set_wmm_default(sdata, false, false);
2087

2088 2089 2090 2091
	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);
2092

2093
	sdata->vif.bss_conf.dtim_period = 0;
2094 2095
	sdata->vif.bss_conf.beacon_rate = NULL;

2096
	ifmgd->have_beacon = false;
2097

2098
	ifmgd->flags = 0;
2099
	mutex_lock(&local->mtx);
2100
	ieee80211_vif_release_channel(sdata);
2101 2102

	sdata->vif.csa_active = false;
2103
	ifmgd->csa_waiting_bcn = false;
2104
	ifmgd->csa_ignored_same_chan = false;
2105 2106 2107 2108 2109
	if (sdata->csa_block_tx) {
		ieee80211_wake_vif_queues(local, sdata,
					  IEEE80211_QUEUE_STOP_REASON_CSA);
		sdata->csa_block_tx = false;
	}
2110
	mutex_unlock(&local->mtx);
2111

2112 2113 2114 2115
	/* existing TX TSPEC sessions no longer exist */
	memset(ifmgd->tx_tspec, 0, sizeof(ifmgd->tx_tspec));
	cancel_delayed_work_sync(&ifmgd->tx_tspec_wk);

2116
	sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
2117
}
2118

2119 2120 2121 2122 2123 2124 2125 2126
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
2127 2128
	 * data idle periods for sending the periodic probe request to the
	 * AP we're connected to.
2129
	 */
J
Johannes Berg 已提交
2130 2131 2132
	if (is_multicast_ether_addr(hdr->addr1))
		return;

2133
	ieee80211_sta_reset_conn_monitor(sdata);
2134
}
2135

2136 2137 2138
static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2139
	struct ieee80211_local *local = sdata->local;
2140

2141
	mutex_lock(&local->mtx);
2142 2143
	if (!(ifmgd->flags & IEEE80211_STA_CONNECTION_POLL))
		goto out;
2144

2145
	__ieee80211_stop_poll(sdata);
2146 2147

	mutex_lock(&local->iflist_mtx);
J
Johannes Berg 已提交
2148
	ieee80211_recalc_ps(local);
2149
	mutex_unlock(&local->iflist_mtx);
2150

2151
	if (ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
2152
		goto out;
2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163

	/*
	 * 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));
2164 2165
out:
	mutex_unlock(&local->mtx);
2166 2167
}

2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202
static void ieee80211_sta_tx_wmm_ac_notify(struct ieee80211_sub_if_data *sdata,
					   struct ieee80211_hdr *hdr,
					   u16 tx_time)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	u16 tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
	int ac = ieee80211_ac_from_tid(tid);
	struct ieee80211_sta_tx_tspec *tx_tspec = &ifmgd->tx_tspec[ac];
	unsigned long now = jiffies;

	if (likely(!tx_tspec->admitted_time))
		return;

	if (time_after(now, tx_tspec->time_slice_start + HZ)) {
		tx_tspec->consumed_tx_time = 0;
		tx_tspec->time_slice_start = now;

		if (tx_tspec->downgraded) {
			tx_tspec->action = TX_TSPEC_ACTION_STOP_DOWNGRADE;
			schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
		}
	}

	if (tx_tspec->downgraded)
		return;

	tx_tspec->consumed_tx_time += tx_time;

	if (tx_tspec->consumed_tx_time >= tx_tspec->admitted_time) {
		tx_tspec->downgraded = true;
		tx_tspec->action = TX_TSPEC_ACTION_DOWNGRADE;
		schedule_delayed_work(&ifmgd->tx_tspec_wk, 0);
	}
}

2203
void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
2204
			     struct ieee80211_hdr *hdr, bool ack, u16 tx_time)
2205
{
2206 2207
	ieee80211_sta_tx_wmm_ac_notify(sdata, hdr, tx_time);

F
Felix Fietkau 已提交
2208
	if (!ieee80211_is_data(hdr->frame_control))
2209 2210 2211 2212
	    return;

	if (ieee80211_is_nullfunc(hdr->frame_control) &&
	    sdata->u.mgd.probe_send_count > 0) {
2213
		if (ack)
2214
			ieee80211_sta_reset_conn_monitor(sdata);
2215 2216
		else
			sdata->u.mgd.nullfunc_failed = true;
2217
		ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2218
		return;
2219
	}
2220 2221 2222

	if (ack)
		ieee80211_sta_reset_conn_monitor(sdata);
2223 2224
}

2225 2226 2227 2228
static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	const u8 *ssid;
2229
	u8 *dst = ifmgd->associated->bssid;
2230
	u8 unicast_limit = max(1, max_probe_tries - 3);
J
Johannes Berg 已提交
2231
	struct sta_info *sta;
2232 2233 2234 2235 2236 2237 2238 2239

	/*
	 * 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;
2240

2241 2242 2243 2244 2245 2246 2247
	/*
	 * 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.
	 */
2248 2249
	ifmgd->probe_send_count++;

J
Johannes Berg 已提交
2250 2251 2252 2253 2254 2255 2256 2257
	if (dst) {
		mutex_lock(&sdata->local->sta_mtx);
		sta = sta_info_get(sdata, dst);
		if (!WARN_ON(!sta))
			ieee80211_check_fast_rx(sta);
		mutex_unlock(&sdata->local->sta_mtx);
	}

2258
	if (ieee80211_hw_check(&sdata->local->hw, REPORTS_TX_ACK_STATUS)) {
2259
		ifmgd->nullfunc_failed = false;
2260
		ieee80211_send_nullfunc(sdata->local, sdata, false);
2261
	} else {
2262 2263
		int ssid_len;

2264
		rcu_read_lock();
2265
		ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
2266 2267 2268 2269 2270
		if (WARN_ON_ONCE(ssid == NULL))
			ssid_len = 0;
		else
			ssid_len = ssid[1];

2271
		ieee80211_send_probe_req(sdata, sdata->vif.addr, dst,
2272
					 ssid + 2, ssid_len, NULL,
2273
					 0, (u32) -1, true, 0,
J
Johannes Berg 已提交
2274
					 ifmgd->associated->channel, false);
2275
		rcu_read_unlock();
2276
	}
2277

2278
	ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
2279
	run_again(sdata, ifmgd->probe_timeout);
2280 2281
}

J
Johannes Berg 已提交
2282 2283
static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
				   bool beacon)
2284 2285
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
J
Johannes Berg 已提交
2286
	bool already = false;
2287

2288
	if (!ieee80211_sdata_running(sdata))
2289 2290
		return;

2291
	sdata_lock(sdata);
2292 2293 2294 2295

	if (!ifmgd->associated)
		goto out;

2296 2297 2298 2299 2300 2301 2302
	mutex_lock(&sdata->local->mtx);

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

2303
	if (beacon) {
J
Johannes Berg 已提交
2304
		mlme_dbg_ratelimited(sdata,
2305 2306
				     "detected beacon loss from AP (missed %d beacons) - probing\n",
				     beacon_loss_count);
J
Johannes Berg 已提交
2307

2308
		ieee80211_cqm_beacon_loss_notify(&sdata->vif, GFP_KERNEL);
2309
	}
2310

J
Johannes Berg 已提交
2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321
	/*
	 * 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!
	 */
2322
	if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL)
J
Johannes Berg 已提交
2323 2324
		already = true;

E
Eliad Peller 已提交
2325 2326
	ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;

2327 2328
	mutex_unlock(&sdata->local->mtx);

J
Johannes Berg 已提交
2329 2330 2331
	if (already)
		goto out;

2332
	mutex_lock(&sdata->local->iflist_mtx);
J
Johannes Berg 已提交
2333
	ieee80211_recalc_ps(sdata->local);
2334 2335
	mutex_unlock(&sdata->local->iflist_mtx);

2336 2337
	ifmgd->probe_send_count = 0;
	ieee80211_mgd_probe_ap_send(sdata);
2338
 out:
2339
	sdata_unlock(sdata);
2340 2341
}

2342 2343 2344 2345 2346
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;
2347
	struct cfg80211_bss *cbss;
2348 2349
	struct sk_buff *skb;
	const u8 *ssid;
2350
	int ssid_len;
2351 2352 2353 2354

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

2355
	sdata_assert_lock(sdata);
2356

2357 2358 2359 2360 2361 2362 2363
	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
2364 2365
		return NULL;

2366
	rcu_read_lock();
2367
	ssid = ieee80211_bss_get_ie(cbss, WLAN_EID_SSID);
2368 2369 2370 2371 2372
	if (WARN_ON_ONCE(ssid == NULL))
		ssid_len = 0;
	else
		ssid_len = ssid[1];

2373
	skb = ieee80211_build_probe_req(sdata, sdata->vif.addr, cbss->bssid,
J
Johannes Berg 已提交
2374
					(u32) -1, cbss->channel,
2375
					ssid + 2, ssid_len,
2376
					NULL, 0, true);
2377
	rcu_read_unlock();
2378 2379 2380 2381 2382

	return skb;
}
EXPORT_SYMBOL(ieee80211_ap_probereq_get);

2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 2400
static void ieee80211_report_disconnect(struct ieee80211_sub_if_data *sdata,
					const u8 *buf, size_t len, bool tx,
					u16 reason)
{
	struct ieee80211_event event = {
		.type = MLME_EVENT,
		.u.mlme.data = tx ? DEAUTH_TX_EVENT : DEAUTH_RX_EVENT,
		.u.mlme.reason = reason,
	};

	if (tx)
		cfg80211_tx_mlme_mgmt(sdata->dev, buf, len);
	else
		cfg80211_rx_mlme_mgmt(sdata->dev, buf, len);

	drv_event_callback(sdata->local, sdata, &event);
}

2401
static void __ieee80211_disconnect(struct ieee80211_sub_if_data *sdata)
2402
{
2403
	struct ieee80211_local *local = sdata->local;
2404
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2405
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
2406

2407
	sdata_lock(sdata);
2408
	if (!ifmgd->associated) {
2409
		sdata_unlock(sdata);
2410 2411 2412
		return;
	}

2413 2414 2415 2416 2417
	/* AP is probably out of range (or not reachable for another reason) so
	 * remove the bss struct for that AP.
	 */
	cfg80211_unlink_bss(local->hw.wiphy, ifmgd->associated);

2418 2419
	ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
			       WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2420
			       true, frame_buf);
2421
	mutex_lock(&local->mtx);
2422
	sdata->vif.csa_active = false;
2423
	ifmgd->csa_waiting_bcn = false;
2424 2425 2426 2427 2428
	if (sdata->csa_block_tx) {
		ieee80211_wake_vif_queues(local, sdata,
					  IEEE80211_QUEUE_STOP_REASON_CSA);
		sdata->csa_block_tx = false;
	}
2429
	mutex_unlock(&local->mtx);
2430

2431 2432 2433
	ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
				    WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);

2434
	sdata_unlock(sdata);
2435 2436
}

2437
static void ieee80211_beacon_connection_loss_work(struct work_struct *work)
J
Johannes Berg 已提交
2438 2439 2440
{
	struct ieee80211_sub_if_data *sdata =
		container_of(work, struct ieee80211_sub_if_data,
2441
			     u.mgd.beacon_connection_loss_work);
2442 2443
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

2444 2445
	if (ifmgd->associated)
		ifmgd->beacon_loss_count++;
J
Johannes Berg 已提交
2446

2447
	if (ifmgd->connection_loss) {
2448 2449
		sdata_info(sdata, "Connection to AP %pM lost\n",
			   ifmgd->bssid);
2450
		__ieee80211_disconnect(sdata);
2451
	} else {
2452
		ieee80211_mgd_probe_ap(sdata, true);
2453 2454 2455 2456 2457 2458 2459 2460 2461
	}
}

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);

2462
	__ieee80211_disconnect(sdata);
J
Johannes Berg 已提交
2463 2464
}

2465 2466 2467
void ieee80211_beacon_loss(struct ieee80211_vif *vif)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2468
	struct ieee80211_hw *hw = &sdata->local->hw;
2469

J
Johannes Berg 已提交
2470 2471
	trace_api_beacon_loss(sdata);

2472
	sdata->u.mgd.connection_loss = false;
2473
	ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
2474 2475 2476
}
EXPORT_SYMBOL(ieee80211_beacon_loss);

2477 2478 2479 2480 2481
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
2482 2483
	trace_api_connection_loss(sdata);

2484
	sdata->u.mgd.connection_loss = true;
2485 2486 2487 2488 2489
	ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
}
EXPORT_SYMBOL(ieee80211_connection_loss);


J
Johannes Berg 已提交
2490 2491 2492 2493 2494
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;

2495
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
2496 2497

	if (!assoc) {
2498 2499 2500 2501 2502 2503
		/*
		 * we are not authenticated yet, the only timer that could be
		 * running is the timeout for the authentication response which
		 * which is not relevant anymore.
		 */
		del_timer_sync(&sdata->u.mgd.timer);
J
Johannes Berg 已提交
2504 2505
		sta_info_destroy_addr(sdata, auth_data->bss->bssid);

2506
		eth_zero_addr(sdata->u.mgd.bssid);
J
Johannes Berg 已提交
2507
		ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
2508
		sdata->u.mgd.flags = 0;
2509
		mutex_lock(&sdata->local->mtx);
J
Johannes Berg 已提交
2510
		ieee80211_vif_release_channel(sdata);
2511
		mutex_unlock(&sdata->local->mtx);
J
Johannes Berg 已提交
2512 2513
	}

2514
	cfg80211_put_bss(sdata->local->hw.wiphy, auth_data->bss);
J
Johannes Berg 已提交
2515 2516 2517 2518
	kfree(auth_data);
	sdata->u.mgd.auth_data = NULL;
}

2519
static void ieee80211_destroy_assoc_data(struct ieee80211_sub_if_data *sdata,
2520
					 bool assoc, bool abandon)
2521 2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537
{
	struct ieee80211_mgd_assoc_data *assoc_data = sdata->u.mgd.assoc_data;

	sdata_assert_lock(sdata);

	if (!assoc) {
		/*
		 * we are not associated yet, the only timer that could be
		 * running is the timeout for the association response which
		 * which is not relevant anymore.
		 */
		del_timer_sync(&sdata->u.mgd.timer);
		sta_info_destroy_addr(sdata, assoc_data->bss->bssid);

		eth_zero_addr(sdata->u.mgd.bssid);
		ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
		sdata->u.mgd.flags = 0;
2538 2539
		sdata->vif.mu_mimo_owner = false;

2540 2541 2542
		mutex_lock(&sdata->local->mtx);
		ieee80211_vif_release_channel(sdata);
		mutex_unlock(&sdata->local->mtx);
2543 2544 2545

		if (abandon)
			cfg80211_abandon_assoc(sdata->dev, assoc_data->bss);
2546 2547 2548 2549 2550 2551
	}

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

J
Johannes Berg 已提交
2552 2553 2554
static void ieee80211_auth_challenge(struct ieee80211_sub_if_data *sdata,
				     struct ieee80211_mgmt *mgmt, size_t len)
{
2555
	struct ieee80211_local *local = sdata->local;
J
Johannes Berg 已提交
2556 2557 2558
	struct ieee80211_mgd_auth_data *auth_data = sdata->u.mgd.auth_data;
	u8 *pos;
	struct ieee802_11_elems elems;
2559
	u32 tx_flags = 0;
J
Johannes Berg 已提交
2560 2561

	pos = mgmt->u.auth.variable;
2562
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
J
Johannes Berg 已提交
2563 2564 2565
	if (!elems.challenge)
		return;
	auth_data->expected_transaction = 4;
J
Johannes Berg 已提交
2566
	drv_mgd_prepare_tx(sdata->local, sdata);
2567
	if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
2568 2569
		tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
			   IEEE80211_TX_INTFL_MLME_CONN_TX;
2570
	ieee80211_send_auth(sdata, 3, auth_data->algorithm, 0,
J
Johannes Berg 已提交
2571 2572 2573
			    elems.challenge - 2, elems.challenge_len + 2,
			    auth_data->bss->bssid, auth_data->bss->bssid,
			    auth_data->key, auth_data->key_len,
2574
			    auth_data->key_idx, tx_flags);
J
Johannes Berg 已提交
2575 2576
}

2577 2578
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
2579 2580 2581 2582 2583
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	u8 bssid[ETH_ALEN];
	u16 auth_alg, auth_transaction, status_code;
	struct sta_info *sta;
2584 2585 2586 2587
	struct ieee80211_event event = {
		.type = MLME_EVENT,
		.u.mlme.data = AUTH_EVENT,
	};
J
Johannes Berg 已提交
2588

2589
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
2590 2591

	if (len < 24 + 6)
2592
		return;
J
Johannes Berg 已提交
2593 2594

	if (!ifmgd->auth_data || ifmgd->auth_data->done)
2595
		return;
J
Johannes Berg 已提交
2596 2597 2598

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

2599
	if (!ether_addr_equal(bssid, mgmt->bssid))
2600
		return;
J
Johannes Berg 已提交
2601 2602 2603 2604 2605 2606

	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 ||
2607 2608 2609 2610 2611
	    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);
2612
		return;
2613
	}
J
Johannes Berg 已提交
2614 2615

	if (status_code != WLAN_STATUS_SUCCESS) {
J
Johannes Berg 已提交
2616 2617
		sdata_info(sdata, "%pM denied authentication (status %d)\n",
			   mgmt->sa, status_code);
2618
		ieee80211_destroy_auth_data(sdata, false);
2619
		cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2620 2621 2622
		event.u.mlme.status = MLME_DENIED;
		event.u.mlme.reason = status_code;
		drv_event_callback(sdata->local, sdata, &event);
2623
		return;
J
Johannes Berg 已提交
2624 2625 2626 2627 2628 2629
	}

	switch (ifmgd->auth_data->algorithm) {
	case WLAN_AUTH_OPEN:
	case WLAN_AUTH_LEAP:
	case WLAN_AUTH_FT:
2630
	case WLAN_AUTH_SAE:
2631 2632 2633
	case WLAN_AUTH_FILS_SK:
	case WLAN_AUTH_FILS_SK_PFS:
	case WLAN_AUTH_FILS_PK:
J
Johannes Berg 已提交
2634 2635 2636 2637 2638
		break;
	case WLAN_AUTH_SHARED_KEY:
		if (ifmgd->auth_data->expected_transaction != 4) {
			ieee80211_auth_challenge(sdata, mgmt, len);
			/* need another frame */
2639
			return;
J
Johannes Berg 已提交
2640 2641 2642 2643 2644
		}
		break;
	default:
		WARN_ONCE(1, "invalid auth alg %d",
			  ifmgd->auth_data->algorithm);
2645
		return;
J
Johannes Berg 已提交
2646 2647
	}

2648 2649
	event.u.mlme.status = MLME_SUCCESS;
	drv_event_callback(sdata->local, sdata, &event);
J
Johannes Berg 已提交
2650
	sdata_info(sdata, "authenticated\n");
J
Johannes Berg 已提交
2651 2652
	ifmgd->auth_data->done = true;
	ifmgd->auth_data->timeout = jiffies + IEEE80211_AUTH_WAIT_ASSOC;
2653
	ifmgd->auth_data->timeout_started = true;
2654
	run_again(sdata, ifmgd->auth_data->timeout);
J
Johannes Berg 已提交
2655

2656 2657 2658 2659 2660 2661
	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.
		 */
2662
		cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2663
		return;
2664 2665
	}

J
Johannes Berg 已提交
2666 2667 2668 2669 2670 2671 2672 2673
	/* 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
2674
		sdata_info(sdata, "failed moving %pM to auth\n", bssid);
J
Johannes Berg 已提交
2675 2676 2677 2678
		goto out_err;
	}
	mutex_unlock(&sdata->local->sta_mtx);

2679
	cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
2680
	return;
J
Johannes Berg 已提交
2681 2682 2683 2684 2685
 out_err:
	mutex_unlock(&sdata->local->sta_mtx);
	/* ignore frame -- wait for timeout */
}

2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741
#define case_WLAN(type) \
	case WLAN_REASON_##type: return #type

static const char *ieee80211_get_reason_code_string(u16 reason_code)
{
	switch (reason_code) {
	case_WLAN(UNSPECIFIED);
	case_WLAN(PREV_AUTH_NOT_VALID);
	case_WLAN(DEAUTH_LEAVING);
	case_WLAN(DISASSOC_DUE_TO_INACTIVITY);
	case_WLAN(DISASSOC_AP_BUSY);
	case_WLAN(CLASS2_FRAME_FROM_NONAUTH_STA);
	case_WLAN(CLASS3_FRAME_FROM_NONASSOC_STA);
	case_WLAN(DISASSOC_STA_HAS_LEFT);
	case_WLAN(STA_REQ_ASSOC_WITHOUT_AUTH);
	case_WLAN(DISASSOC_BAD_POWER);
	case_WLAN(DISASSOC_BAD_SUPP_CHAN);
	case_WLAN(INVALID_IE);
	case_WLAN(MIC_FAILURE);
	case_WLAN(4WAY_HANDSHAKE_TIMEOUT);
	case_WLAN(GROUP_KEY_HANDSHAKE_TIMEOUT);
	case_WLAN(IE_DIFFERENT);
	case_WLAN(INVALID_GROUP_CIPHER);
	case_WLAN(INVALID_PAIRWISE_CIPHER);
	case_WLAN(INVALID_AKMP);
	case_WLAN(UNSUPP_RSN_VERSION);
	case_WLAN(INVALID_RSN_IE_CAP);
	case_WLAN(IEEE8021X_FAILED);
	case_WLAN(CIPHER_SUITE_REJECTED);
	case_WLAN(DISASSOC_UNSPECIFIED_QOS);
	case_WLAN(DISASSOC_QAP_NO_BANDWIDTH);
	case_WLAN(DISASSOC_LOW_ACK);
	case_WLAN(DISASSOC_QAP_EXCEED_TXOP);
	case_WLAN(QSTA_LEAVE_QBSS);
	case_WLAN(QSTA_NOT_USE);
	case_WLAN(QSTA_REQUIRE_SETUP);
	case_WLAN(QSTA_TIMEOUT);
	case_WLAN(QSTA_CIPHER_NOT_SUPP);
	case_WLAN(MESH_PEER_CANCELED);
	case_WLAN(MESH_MAX_PEERS);
	case_WLAN(MESH_CONFIG);
	case_WLAN(MESH_CLOSE);
	case_WLAN(MESH_MAX_RETRIES);
	case_WLAN(MESH_CONFIRM_TIMEOUT);
	case_WLAN(MESH_INVALID_GTK);
	case_WLAN(MESH_INCONSISTENT_PARAM);
	case_WLAN(MESH_INVALID_SECURITY);
	case_WLAN(MESH_PATH_ERROR);
	case_WLAN(MESH_PATH_NOFORWARD);
	case_WLAN(MESH_PATH_DEST_UNREACHABLE);
	case_WLAN(MAC_EXISTS_IN_MBSS);
	case_WLAN(MESH_CHAN_REGULATORY);
	case_WLAN(MESH_CHAN);
	default: return "<unknown>";
	}
}
J
Johannes Berg 已提交
2742

2743 2744
static void ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
				     struct ieee80211_mgmt *mgmt, size_t len)
2745
{
2746
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2747
	u16 reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
2748

2749
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
2750

2751
	if (len < 24 + 2)
2752
		return;
2753

2754 2755 2756
	if (ifmgd->associated &&
	    ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid)) {
		const u8 *bssid = ifmgd->associated->bssid;
2757

2758 2759 2760
		sdata_info(sdata, "deauthenticated from %pM (Reason: %u=%s)\n",
			   bssid, reason_code,
			   ieee80211_get_reason_code_string(reason_code));
2761

2762
		ieee80211_set_disassoc(sdata, 0, 0, false, NULL);
2763

2764 2765 2766 2767
		ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false,
					    reason_code);
		return;
	}
2768

2769 2770 2771
	if (ifmgd->assoc_data &&
	    ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
		const u8 *bssid = ifmgd->assoc_data->bss->bssid;
2772

2773 2774 2775 2776 2777
		sdata_info(sdata,
			   "deauthenticated from %pM while associating (Reason: %u=%s)\n",
			   bssid, reason_code,
			   ieee80211_get_reason_code_string(reason_code));

2778
		ieee80211_destroy_assoc_data(sdata, false, true);
2779 2780 2781 2782

		cfg80211_rx_mlme_mgmt(sdata->dev, (u8 *)mgmt, len);
		return;
	}
2783 2784 2785
}


2786 2787
static void ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
				       struct ieee80211_mgmt *mgmt, size_t len)
2788
{
2789
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2790 2791
	u16 reason_code;

2792
	sdata_assert_lock(sdata);
2793

J
Johannes Berg 已提交
2794
	if (len < 24 + 2)
2795
		return;
2796

J
Johannes Berg 已提交
2797
	if (!ifmgd->associated ||
2798
	    !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
2799
		return;
2800 2801 2802

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

2803 2804 2805
	sdata_info(sdata, "disassociated from %pM (Reason: %u=%s)\n",
		   mgmt->sa, reason_code,
		   ieee80211_get_reason_code_string(reason_code));
2806

2807 2808
	ieee80211_set_disassoc(sdata, 0, 0, false, NULL);

2809
	ieee80211_report_disconnect(sdata, (u8 *)mgmt, len, false, reason_code);
2810 2811
}

2812 2813 2814 2815
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,
2816
				int *min_rate, int *min_rate_index,
2817
				int shift)
2818 2819 2820 2821
{
	int i, j;

	for (i = 0; i < supp_rates_len; i++) {
2822
		int rate = supp_rates[i] & 0x7f;
2823 2824
		bool is_basic = !!(supp_rates[i] & 0x80);

2825
		if ((rate * 5 * (1 << shift)) > 110)
2826 2827 2828
			*have_higher_than_11mbit = true;

		/*
2829 2830
		 * Skip HT and VHT BSS membership selectors since they're not
		 * rates.
2831
		 *
2832
		 * Note: Even though the membership selector and the basic
2833 2834 2835
		 *	 rate flag share the same bit, they are not exactly
		 *	 the same.
		 */
2836 2837
		if (supp_rates[i] == (0x80 | BSS_MEMBERSHIP_SELECTOR_HT_PHY) ||
		    supp_rates[i] == (0x80 | BSS_MEMBERSHIP_SELECTOR_VHT_PHY))
2838 2839 2840
			continue;

		for (j = 0; j < sband->n_bitrates; j++) {
2841 2842 2843 2844 2845 2846 2847
			struct ieee80211_rate *br;
			int brate;

			br = &sband->bitrates[j];

			brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
			if (brate == rate) {
2848 2849 2850
				*rates |= BIT(j);
				if (is_basic)
					*basic_rates |= BIT(j);
2851 2852
				if ((rate * 5) < *min_rate) {
					*min_rate = rate * 5;
2853 2854 2855 2856 2857 2858 2859
					*min_rate_index = j;
				}
				break;
			}
		}
	}
}
2860

J
Johannes Berg 已提交
2861 2862
static bool ieee80211_assoc_success(struct ieee80211_sub_if_data *sdata,
				    struct cfg80211_bss *cbss,
J
Johannes Berg 已提交
2863
				    struct ieee80211_mgmt *mgmt, size_t len)
2864
{
2865
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2866
	struct ieee80211_local *local = sdata->local;
2867
	struct ieee80211_supported_band *sband;
2868
	struct sta_info *sta;
J
Johannes Berg 已提交
2869 2870
	u8 *pos;
	u16 capab_info, aid;
2871
	struct ieee802_11_elems elems;
J
Johannes Berg 已提交
2872
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
2873 2874
	const struct cfg80211_bss_ies *bss_ies = NULL;
	struct ieee80211_mgd_assoc_data *assoc_data = ifmgd->assoc_data;
J
Johannes Berg 已提交
2875
	u32 changed = 0;
2876
	int err;
2877
	bool ret;
2878

J
Johannes Berg 已提交
2879
	/* AssocResp and ReassocResp have identical structure */
2880 2881

	aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
J
Johannes Berg 已提交
2882
	capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
2883

2884
	if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
J
Johannes Berg 已提交
2885 2886
		sdata_info(sdata, "invalid AID value 0x%x; bits 15:14 not set\n",
			   aid);
2887 2888
	aid &= ~(BIT(15) | BIT(14));

2889 2890 2891
	ifmgd->broken_ap = false;

	if (aid == 0 || aid > IEEE80211_MAX_AID) {
J
Johannes Berg 已提交
2892 2893
		sdata_info(sdata, "invalid AID value %d (out of range), turn off PS\n",
			   aid);
2894 2895 2896 2897
		aid = 0;
		ifmgd->broken_ap = true;
	}

J
Johannes Berg 已提交
2898
	pos = mgmt->u.assoc_resp.variable;
2899
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
J
Johannes Berg 已提交
2900

2901
	if (!elems.supp_rates) {
J
Johannes Berg 已提交
2902
		sdata_info(sdata, "no SuppRates element in AssocResp\n");
J
Johannes Berg 已提交
2903
		return false;
2904 2905
	}

2906
	ifmgd->aid = aid;
2907 2908 2909
	ifmgd->tdls_chan_switch_prohibited =
		elems.ext_capab && elems.ext_capab_len >= 5 &&
		(elems.ext_capab[4] & WLAN_EXT_CAPA5_TDLS_CH_SW_PROHIBITED);
2910

2911 2912 2913 2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971 2972 2973
	/*
	 * 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");
		}
	}

2974 2975 2976 2977 2978 2979 2980
	/*
	 * 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,
2981 2982 2983
			   "HT AP is missing WMM params or HT capability/operation\n");
		ret = false;
		goto out;
2984 2985 2986 2987 2988
	}

	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
	    (!elems.vht_cap_elem || !elems.vht_operation)) {
		sdata_info(sdata,
2989 2990 2991
			   "VHT AP is missing VHT capability/operation\n");
		ret = false;
		goto out;
2992 2993
	}

2994 2995 2996 2997 2998
	mutex_lock(&sdata->local->sta_mtx);
	/*
	 * station info was already allocated and inserted before
	 * the association and should be available to us
	 */
2999
	sta = sta_info_get(sdata, cbss->bssid);
3000 3001
	if (WARN_ON(!sta)) {
		mutex_unlock(&sdata->local->sta_mtx);
3002 3003
		ret = false;
		goto out;
3004
	}
3005

3006 3007 3008 3009 3010 3011
	sband = ieee80211_get_sband(sdata);
	if (!sband) {
		mutex_unlock(&sdata->local->sta_mtx);
		ret = false;
		goto out;
	}
3012

3013
	/* Set up internal HT/VHT capabilities */
3014
	if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_HT))
B
Ben Greear 已提交
3015
		ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
3016
						  elems.ht_cap_elem, sta);
3017

M
Mahesh Palivela 已提交
3018 3019
	if (elems.vht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_VHT))
		ieee80211_vht_cap_ie_to_sta_vht_cap(sdata, sband,
3020
						    elems.vht_cap_elem, sta);
M
Mahesh Palivela 已提交
3021

3022 3023 3024 3025 3026 3027
	/*
	 * 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.
	 */
3028

3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043
	/*
	 * 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;
	}

3044
	rate_control_rate_init(sta);
3045

3046
	if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED) {
J
Johannes Berg 已提交
3047
		set_sta_flag(sta, WLAN_STA_MFP);
3048 3049 3050 3051
		sta->sta.mfp = true;
	} else {
		sta->sta.mfp = false;
	}
3052

3053
	sta->sta.wme = elems.wmm_param && local->hw.queues >= IEEE80211_NUM_ACS;
3054

3055
	err = sta_info_move_state(sta, IEEE80211_STA_ASSOC);
3056 3057 3058
	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
3059 3060 3061
		sdata_info(sdata,
			   "failed to move station %pM to desired state\n",
			   sta->sta.addr);
3062 3063
		WARN_ON(__sta_info_destroy(sta));
		mutex_unlock(&sdata->local->sta_mtx);
3064 3065
		ret = false;
		goto out;
3066 3067
	}

3068
	mutex_unlock(&sdata->local->sta_mtx);
3069

3070 3071 3072 3073 3074 3075 3076 3077
	/*
	 * 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;

3078
	if (ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
3079
		ieee80211_set_wmm_default(sdata, false, false);
3080 3081 3082 3083 3084 3085 3086 3087 3088 3089 3090 3091 3092
	} else if (!ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
					     elems.wmm_param_len)) {
		/* still enable QoS since we might have HT/VHT */
		ieee80211_set_wmm_default(sdata, false, true);
		/* set the disable-WMM flag in this case to disable
		 * tracking WMM parameter changes in the beacon if
		 * the parameters weren't actually valid. Doing so
		 * avoids changing parameters very strangely when
		 * the AP is going back and forth between valid and
		 * invalid parameters.
		 */
		ifmgd->flags |= IEEE80211_STA_DISABLE_WMM;
	}
3093
	changed |= BSS_CHANGED_QOS;
3094

3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105 3106
	if (elems.max_idle_period_ie) {
		bss_conf->max_idle_period =
			le16_to_cpu(elems.max_idle_period_ie->max_idle_period);
		bss_conf->protected_keep_alive =
			!!(elems.max_idle_period_ie->idle_options &
			   WLAN_IDLE_OPTIONS_PROTECTED_KEEP_ALIVE);
		changed |= BSS_CHANGED_KEEP_ALIVE;
	} else {
		bss_conf->max_idle_period = 0;
		bss_conf->protected_keep_alive = false;
	}

J
Johannes Berg 已提交
3107 3108 3109 3110
	/* set AID and assoc capability,
	 * ieee80211_set_associated() will tell the driver */
	bss_conf->aid = aid;
	bss_conf->assoc_capability = capab_info;
3111
	ieee80211_set_associated(sdata, cbss, changed);
3112

3113 3114 3115 3116 3117 3118 3119
	/*
	 * 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);

3120
	/*
J
Johannes Berg 已提交
3121 3122
	 * Start timer to probe the connection to the AP now.
	 * Also start the timer that will detect beacon loss.
3123
	 */
J
Johannes Berg 已提交
3124
	ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
3125
	ieee80211_sta_reset_beacon_monitor(sdata);
3126

3127 3128 3129 3130
	ret = true;
 out:
	kfree(bss_ies);
	return ret;
3131 3132
}

3133 3134 3135
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
3136 3137 3138 3139 3140
{
	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;
3141
	int ac, uapsd_queues = -1;
J
Johannes Berg 已提交
3142 3143
	u8 *pos;
	bool reassoc;
3144
	struct cfg80211_bss *bss;
3145 3146 3147 3148
	struct ieee80211_event event = {
		.type = MLME_EVENT,
		.u.mlme.data = ASSOC_EVENT,
	};
J
Johannes Berg 已提交
3149

3150
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
3151 3152

	if (!assoc_data)
3153
		return;
3154
	if (!ether_addr_equal(assoc_data->bss->bssid, mgmt->bssid))
3155
		return;
J
Johannes Berg 已提交
3156 3157 3158 3159 3160 3161 3162

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

	if (len < 24 + 6)
3163
		return;
J
Johannes Berg 已提交
3164 3165 3166 3167 3168 3169

	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
3170 3171 3172 3173
	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
3174

3175 3176 3177 3178
	if (assoc_data->fils_kek_len &&
	    fils_decrypt_assoc_resp(sdata, (u8 *)mgmt, &len, assoc_data) < 0)
		return;

J
Johannes Berg 已提交
3179
	pos = mgmt->u.assoc_resp.variable;
3180
	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), false, &elems);
J
Johannes Berg 已提交
3181 3182

	if (status_code == WLAN_STATUS_ASSOC_REJECTED_TEMPORARILY &&
3183 3184
	    elems.timeout_int &&
	    elems.timeout_int->type == WLAN_TIMEOUT_ASSOC_COMEBACK) {
J
Johannes Berg 已提交
3185
		u32 tu, ms;
3186
		tu = le32_to_cpu(elems.timeout_int->value);
J
Johannes Berg 已提交
3187
		ms = tu * 1024 / 1000;
J
Johannes Berg 已提交
3188 3189 3190
		sdata_info(sdata,
			   "%pM rejected association temporarily; comeback duration %u TU (%u ms)\n",
			   mgmt->sa, tu, ms);
J
Johannes Berg 已提交
3191
		assoc_data->timeout = jiffies + msecs_to_jiffies(ms);
3192
		assoc_data->timeout_started = true;
J
Johannes Berg 已提交
3193
		if (ms > IEEE80211_ASSOC_TIMEOUT)
3194 3195
			run_again(sdata, assoc_data->timeout);
		return;
J
Johannes Berg 已提交
3196 3197
	}

3198
	bss = assoc_data->bss;
J
Johannes Berg 已提交
3199 3200

	if (status_code != WLAN_STATUS_SUCCESS) {
J
Johannes Berg 已提交
3201 3202
		sdata_info(sdata, "%pM denied association (code=%d)\n",
			   mgmt->sa, status_code);
3203
		ieee80211_destroy_assoc_data(sdata, false, false);
3204 3205 3206
		event.u.mlme.status = MLME_DENIED;
		event.u.mlme.reason = status_code;
		drv_event_callback(sdata->local, sdata, &event);
J
Johannes Berg 已提交
3207
	} else {
3208
		if (!ieee80211_assoc_success(sdata, bss, mgmt, len)) {
J
Johannes Berg 已提交
3209
			/* oops -- internal error -- send timeout for now */
3210
			ieee80211_destroy_assoc_data(sdata, false, false);
3211
			cfg80211_assoc_timeout(sdata->dev, bss);
3212
			return;
J
Johannes Berg 已提交
3213
		}
3214 3215
		event.u.mlme.status = MLME_SUCCESS;
		drv_event_callback(sdata->local, sdata, &event);
3216
		sdata_info(sdata, "associated\n");
3217 3218 3219 3220 3221 3222

		/*
		 * 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
		 */
3223
		ieee80211_destroy_assoc_data(sdata, true, false);
3224 3225 3226 3227 3228

		/* get uapsd queues configuration */
		uapsd_queues = 0;
		for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
			if (sdata->tx_conf[ac].uapsd)
3229
				uapsd_queues |= ieee80211_ac_to_qos_mask[ac];
J
Johannes Berg 已提交
3230 3231
	}

3232
	cfg80211_rx_assoc_resp(sdata->dev, bss, (u8 *)mgmt, len, uapsd_queues);
J
Johannes Berg 已提交
3233
}
J
Johannes Berg 已提交
3234

3235
static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
J
Johannes Berg 已提交
3236
				  struct ieee80211_mgmt *mgmt, size_t len,
3237
				  struct ieee80211_rx_status *rx_status,
3238
				  struct ieee802_11_elems *elems)
3239 3240
{
	struct ieee80211_local *local = sdata->local;
3241
	struct ieee80211_bss *bss;
3242
	struct ieee80211_channel *channel;
3243

3244
	sdata_assert_lock(sdata);
3245

3246 3247
	channel = ieee80211_get_channel(local->hw.wiphy, rx_status->freq);
	if (!channel)
3248 3249 3250
		return;

	bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
3251
					channel);
3252 3253
	if (bss) {
		sdata->vif.bss_conf.beacon_rate = bss->beacon_rate;
3254
		ieee80211_rx_bss_put(local, bss);
3255
	}
3256 3257 3258
}


3259
static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
J
Johannes Berg 已提交
3260
					 struct sk_buff *skb)
3261
{
J
Johannes Berg 已提交
3262
	struct ieee80211_mgmt *mgmt = (void *)skb->data;
3263
	struct ieee80211_if_managed *ifmgd;
J
Johannes Berg 已提交
3264 3265
	struct ieee80211_rx_status *rx_status = (void *) skb->cb;
	size_t baselen, len = skb->len;
3266 3267
	struct ieee802_11_elems elems;

3268 3269
	ifmgd = &sdata->u.mgd;

3270
	sdata_assert_lock(sdata);
3271

3272
	if (!ether_addr_equal(mgmt->da, sdata->vif.addr))
3273 3274
		return; /* ignore ProbeResp to foreign address */

3275 3276 3277 3278 3279
	baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
	if (baselen > len)
		return;

	ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
3280
			       false, &elems);
3281

3282
	ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3283

3284
	if (ifmgd->associated &&
3285
	    ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3286
		ieee80211_reset_ap_probe(sdata);
3287 3288
}

3289 3290 3291
/*
 * This is the canonical list of information elements we care about,
 * the filter code also gives us all changes to the Microsoft OUI
3292 3293 3294
 * (00:50:F2) vendor IE which is used for WMM which we need to track,
 * as well as the DTPC IE (part of the Cisco OUI) used for signaling
 * changes to requested client power.
3295 3296 3297 3298 3299 3300 3301 3302 3303 3304
 *
 * 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 =
3305 3306 3307 3308 3309
	(1ULL << WLAN_EID_COUNTRY) |
	(1ULL << WLAN_EID_ERP_INFO) |
	(1ULL << WLAN_EID_CHANNEL_SWITCH) |
	(1ULL << WLAN_EID_PWR_CONSTRAINT) |
	(1ULL << WLAN_EID_HT_CAPABILITY) |
3310 3311
	(1ULL << WLAN_EID_HT_OPERATION) |
	(1ULL << WLAN_EID_EXT_CHANSWITCH_ANN);
3312

3313 3314 3315
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)
3316
{
3317
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
3318
	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
3319 3320
	size_t baselen;
	struct ieee802_11_elems elems;
3321
	struct ieee80211_local *local = sdata->local;
J
Johannes Berg 已提交
3322 3323
	struct ieee80211_chanctx_conf *chanctx_conf;
	struct ieee80211_channel *chan;
3324
	struct sta_info *sta;
3325
	u32 changed = 0;
3326
	bool erp_valid;
J
Johannes Berg 已提交
3327
	u8 erp_value = 0;
3328
	u32 ncrc;
3329
	u8 *bssid;
3330
	u8 deauth_buf[IEEE80211_DEAUTH_FRAME_LEN];
3331

3332
	sdata_assert_lock(sdata);
3333

3334 3335 3336
	/* Process beacon from the current BSS */
	baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
	if (baselen > len)
3337
		return;
3338

J
Johannes Berg 已提交
3339 3340 3341 3342
	rcu_read_lock();
	chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
	if (!chanctx_conf) {
		rcu_read_unlock();
3343
		return;
J
Johannes Berg 已提交
3344 3345
	}

3346
	if (rx_status->freq != chanctx_conf->def.chan->center_freq) {
J
Johannes Berg 已提交
3347
		rcu_read_unlock();
3348
		return;
J
Johannes Berg 已提交
3349
	}
3350
	chan = chanctx_conf->def.chan;
J
Johannes Berg 已提交
3351
	rcu_read_unlock();
3352

3353
	if (ifmgd->assoc_data && ifmgd->assoc_data->need_beacon &&
3354
	    ether_addr_equal(mgmt->bssid, ifmgd->assoc_data->bss->bssid)) {
J
Johannes Berg 已提交
3355
		ieee802_11_parse_elems(mgmt->u.beacon.variable,
3356
				       len - baselen, false, &elems);
3357

3358
		ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3359 3360 3361 3362
		if (elems.tim && !elems.parse_error) {
			const struct ieee80211_tim_ie *tim_ie = elems.tim;
			ifmgd->dtim_period = tim_ie->dtim_period;
		}
3363
		ifmgd->have_beacon = true;
3364
		ifmgd->assoc_data->need_beacon = false;
3365
		if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3366 3367 3368 3369 3370 3371 3372 3373 3374 3375
			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
3376 3377
		/* continue assoc process */
		ifmgd->assoc_data->timeout = jiffies;
3378
		ifmgd->assoc_data->timeout_started = true;
3379 3380
		run_again(sdata, ifmgd->assoc_data->timeout);
		return;
J
Johannes Berg 已提交
3381
	}
3382

J
Johannes Berg 已提交
3383
	if (!ifmgd->associated ||
3384
	    !ether_addr_equal(mgmt->bssid, ifmgd->associated->bssid))
3385
		return;
J
Johannes Berg 已提交
3386
	bssid = ifmgd->associated->bssid;
3387

3388 3389 3390
	/* Track average RSSI from the Beacon frames of the current AP */
	if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
		ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
3391
		ewma_beacon_signal_init(&ifmgd->ave_beacon_signal);
3392
		ifmgd->last_cqm_event_signal = 0;
3393
		ifmgd->count_beacon_signal = 1;
3394
		ifmgd->last_ave_beacon_signal = 0;
3395
	} else {
3396
		ifmgd->count_beacon_signal++;
3397
	}
3398

3399 3400
	ewma_beacon_signal_add(&ifmgd->ave_beacon_signal, -rx_status->signal);

3401 3402
	if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
	    ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
3403
		int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3404
		int last_sig = ifmgd->last_ave_beacon_signal;
3405 3406 3407
		struct ieee80211_event event = {
			.type = RSSI_EVENT,
		};
3408 3409 3410 3411 3412 3413 3414 3415

		/*
		 * 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;
3416 3417
			event.u.rssi.data = RSSI_EVENT_HIGH;
			drv_event_callback(local, sdata, &event);
3418 3419 3420 3421
		} else if (sig < ifmgd->rssi_min_thold &&
			   (last_sig >= ifmgd->rssi_max_thold ||
			   last_sig == 0)) {
			ifmgd->last_ave_beacon_signal = sig;
3422 3423
			event.u.rssi.data = RSSI_EVENT_LOW;
			drv_event_callback(local, sdata, &event);
3424 3425 3426
		}
	}

3427
	if (bss_conf->cqm_rssi_thold &&
3428
	    ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
3429
	    !(sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_CQM_RSSI)) {
3430
		int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
3431 3432 3433
		int last_event = ifmgd->last_cqm_event_signal;
		int thold = bss_conf->cqm_rssi_thold;
		int hyst = bss_conf->cqm_rssi_hyst;
3434

3435 3436 3437 3438 3439 3440
		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,
3441
				sig, GFP_KERNEL);
3442 3443 3444 3445 3446 3447
		} 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,
3448
				sig, GFP_KERNEL);
3449 3450 3451
		}
	}

3452 3453 3454 3455 3456 3457 3458 3459 3460 3461 3462 3463 3464 3465 3466 3467 3468 3469 3470 3471 3472 3473 3474 3475
	if (bss_conf->cqm_rssi_low &&
	    ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
		int sig = -ewma_beacon_signal_read(&ifmgd->ave_beacon_signal);
		int last_event = ifmgd->last_cqm_event_signal;
		int low = bss_conf->cqm_rssi_low;
		int high = bss_conf->cqm_rssi_high;

		if (sig < low &&
		    (last_event == 0 || last_event >= low)) {
			ifmgd->last_cqm_event_signal = sig;
			ieee80211_cqm_rssi_notify(
				&sdata->vif,
				NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
				sig, GFP_KERNEL);
		} else if (sig > high &&
			   (last_event == 0 || last_event <= high)) {
			ifmgd->last_cqm_event_signal = sig;
			ieee80211_cqm_rssi_notify(
				&sdata->vif,
				NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
				sig, GFP_KERNEL);
		}
	}

3476
	if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL) {
J
Johannes Berg 已提交
3477
		mlme_dbg_ratelimited(sdata,
3478
				     "cancelling AP probe due to a received beacon\n");
3479
		ieee80211_reset_ap_probe(sdata);
3480 3481
	}

J
Johannes Berg 已提交
3482 3483 3484 3485
	/*
	 * Push the beacon loss detection into the future since
	 * we are processing a beacon from the AP just now.
	 */
3486
	ieee80211_sta_reset_beacon_monitor(sdata);
J
Johannes Berg 已提交
3487

3488 3489
	ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
	ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
3490
					  len - baselen, false, &elems,
3491 3492
					  care_about_ies, ncrc);

3493 3494 3495 3496 3497 3498 3499
	if (ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK) &&
	    ieee80211_check_tim(elems.tim, elems.tim_len, ifmgd->aid)) {
		if (local->hw.conf.dynamic_ps_timeout > 0) {
			if (local->hw.conf.flags & IEEE80211_CONF_PS) {
				local->hw.conf.flags &= ~IEEE80211_CONF_PS;
				ieee80211_hw_config(local,
						    IEEE80211_CONF_CHANGE_PS);
3500
			}
3501
			ieee80211_send_nullfunc(local, sdata, false);
3502 3503 3504 3505 3506 3507 3508 3509 3510 3511 3512 3513
		} else if (!local->pspolling && sdata->u.mgd.powersave) {
			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);
3514 3515
		}
	}
J
Johannes Berg 已提交
3516

3517 3518
	if (sdata->vif.p2p ||
	    sdata->vif.driver_flags & IEEE80211_VIF_GET_NOA_UPDATE) {
J
Janusz Dziedzic 已提交
3519
		struct ieee80211_p2p_noa_attr noa = {};
3520 3521 3522 3523 3524
		int ret;

		ret = cfg80211_get_p2p_attr(mgmt->u.beacon.variable,
					    len - baselen,
					    IEEE80211_P2P_ATTR_ABSENCE_NOTICE,
3525
					    (u8 *) &noa, sizeof(noa));
J
Janusz Dziedzic 已提交
3526 3527 3528 3529 3530 3531 3532 3533 3534 3535 3536 3537 3538 3539 3540 3541
		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));
3542 3543 3544 3545 3546
			changed |= BSS_CHANGED_P2P_PS;
			ifmgd->beacon_crc_valid = false;
		}
	}

3547 3548 3549
	if (ifmgd->csa_waiting_bcn)
		ieee80211_chswitch_post_beacon(sdata);

3550 3551 3552 3553 3554 3555 3556 3557
	/*
	 * Update beacon timing and dtim count on every beacon appearance. This
	 * will allow the driver to use the most updated values. Do it before
	 * comparing this one with last received beacon.
	 * IMPORTANT: These parameters would possibly be out of sync by the time
	 * the driver will use them. The synchronized view is currently
	 * guaranteed only in certain callbacks.
	 */
3558
	if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
3559 3560 3561 3562 3563 3564 3565 3566 3567 3568 3569
		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;
	}

3570
	if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
3571
		return;
3572
	ifmgd->beacon_crc = ncrc;
3573
	ifmgd->beacon_crc_valid = true;
3574

3575
	ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems);
3576

3577
	ieee80211_sta_process_chanswitch(sdata, rx_status->mactime,
3578
					 rx_status->device_timestamp,
3579 3580
					 &elems, true);

3581 3582
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_WMM) &&
	    ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
3583 3584 3585
				     elems.wmm_param_len))
		changed |= BSS_CHANGED_QOS;

3586 3587
	/*
	 * If we haven't had a beacon before, tell the driver about the
3588
	 * DTIM period (and beacon timing if desired) now.
3589
	 */
3590
	if (!ifmgd->have_beacon) {
3591 3592 3593 3594 3595
		/* 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;
3596

3597 3598
		changed |= BSS_CHANGED_BEACON_INFO;
		ifmgd->have_beacon = true;
3599 3600

		mutex_lock(&local->iflist_mtx);
J
Johannes Berg 已提交
3601
		ieee80211_recalc_ps(local);
3602 3603
		mutex_unlock(&local->iflist_mtx);

3604
		ieee80211_recalc_ps_vif(sdata);
3605 3606
	}

3607
	if (elems.erp_info) {
J
Johannes Berg 已提交
3608 3609 3610 3611
		erp_valid = true;
		erp_value = elems.erp_info[0];
	} else {
		erp_valid = false;
3612
	}
J
Johannes Berg 已提交
3613 3614 3615
	changed |= ieee80211_handle_bss_capability(sdata,
			le16_to_cpu(mgmt->u.beacon.capab_info),
			erp_valid, erp_value);
3616

3617
	mutex_lock(&local->sta_mtx);
3618 3619
	sta = sta_info_get(sdata, bssid);

3620 3621
	if (ieee80211_config_bw(sdata, sta,
				elems.ht_cap_elem, elems.ht_operation,
3622 3623
				elems.vht_operation, bssid, &changed)) {
		mutex_unlock(&local->sta_mtx);
3624 3625 3626
		sdata_info(sdata,
			   "failed to follow AP %pM bandwidth change, disconnect\n",
			   bssid);
3627 3628 3629
		ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
				       WLAN_REASON_DEAUTH_LEAVING,
				       true, deauth_buf);
3630 3631 3632
		ieee80211_report_disconnect(sdata, deauth_buf,
					    sizeof(deauth_buf), true,
					    WLAN_REASON_DEAUTH_LEAVING);
3633
		return;
3634
	}
3635 3636 3637

	if (sta && elems.opmode_notif)
		ieee80211_vht_handle_opmode(sdata, sta, *elems.opmode_notif,
3638
					    rx_status->band);
3639
	mutex_unlock(&local->sta_mtx);
3640

3641 3642 3643
	changed |= ieee80211_handle_pwr_constr(sdata, chan, mgmt,
					       elems.country_elem,
					       elems.country_elem_len,
3644 3645
					       elems.pwr_constr_elem,
					       elems.cisco_dtpc_elem);
3646

3647
	ieee80211_bss_info_change_notify(sdata, changed);
3648 3649
}

3650 3651
void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
				  struct sk_buff *skb)
3652 3653 3654 3655
{
	struct ieee80211_rx_status *rx_status;
	struct ieee80211_mgmt *mgmt;
	u16 fc;
3656 3657
	struct ieee802_11_elems elems;
	int ies_len;
3658 3659 3660 3661 3662

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

3663
	sdata_lock(sdata);
3664

J
Johannes Berg 已提交
3665 3666
	switch (fc & IEEE80211_FCTL_STYPE) {
	case IEEE80211_STYPE_BEACON:
3667
		ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len, rx_status);
J
Johannes Berg 已提交
3668 3669 3670 3671 3672
		break;
	case IEEE80211_STYPE_PROBE_RESP:
		ieee80211_rx_mgmt_probe_resp(sdata, skb);
		break;
	case IEEE80211_STYPE_AUTH:
3673
		ieee80211_rx_mgmt_auth(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
3674 3675
		break;
	case IEEE80211_STYPE_DEAUTH:
3676
		ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
3677 3678
		break;
	case IEEE80211_STYPE_DISASSOC:
3679
		ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
3680 3681 3682
		break;
	case IEEE80211_STYPE_ASSOC_RESP:
	case IEEE80211_STYPE_REASSOC_RESP:
3683
		ieee80211_rx_mgmt_assoc_resp(sdata, mgmt, skb->len);
J
Johannes Berg 已提交
3684 3685
		break;
	case IEEE80211_STYPE_ACTION:
3686
		if (mgmt->u.action.category == WLAN_CATEGORY_SPECTRUM_MGMT) {
3687 3688 3689
			ies_len = skb->len -
				  offsetof(struct ieee80211_mgmt,
					   u.action.u.chan_switch.variable);
3690 3691 3692 3693 3694 3695

			if (ies_len < 0)
				break;

			ieee802_11_parse_elems(
				mgmt->u.action.u.chan_switch.variable,
3696
				ies_len, true, &elems);
3697 3698 3699 3700

			if (elems.parse_error)
				break;

3701
			ieee80211_sta_process_chanswitch(sdata,
3702 3703 3704
						 rx_status->mactime,
						 rx_status->device_timestamp,
						 &elems, false);
3705 3706 3707 3708 3709 3710 3711 3712 3713 3714
		} 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,
3715
				ies_len, true, &elems);
3716 3717 3718 3719 3720 3721 3722 3723

			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
3724
			ieee80211_sta_process_chanswitch(sdata,
3725 3726 3727
						 rx_status->mactime,
						 rx_status->device_timestamp,
						 &elems, false);
3728
		}
3729
		break;
3730
	}
3731
	sdata_unlock(sdata);
3732 3733
}

J
Johannes Berg 已提交
3734
static void ieee80211_sta_timer(unsigned long data)
3735
{
J
Johannes Berg 已提交
3736 3737
	struct ieee80211_sub_if_data *sdata =
		(struct ieee80211_sub_if_data *) data;
3738

3739
	ieee80211_queue_work(&sdata->local->hw, &sdata->work);
3740 3741
}

3742
static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
3743
					  u8 *bssid, u8 reason, bool tx)
3744
{
3745
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
3746

3747
	ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH, reason,
3748
			       tx, frame_buf);
3749

3750 3751
	ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
				    reason);
3752 3753
}

3754
static int ieee80211_auth(struct ieee80211_sub_if_data *sdata)
J
Johannes Berg 已提交
3755 3756 3757 3758
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	struct ieee80211_mgd_auth_data *auth_data = ifmgd->auth_data;
3759
	u32 tx_flags = 0;
3760 3761
	u16 trans = 1;
	u16 status = 0;
J
Johannes Berg 已提交
3762

3763
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
3764 3765 3766 3767 3768 3769 3770

	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
3771 3772
		sdata_info(sdata, "authentication with %pM timed out\n",
			   auth_data->bss->bssid);
J
Johannes Berg 已提交
3773 3774 3775 3776 3777 3778 3779 3780 3781 3782

		/*
		 * 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
3783 3784
	drv_mgd_prepare_tx(local, sdata);

3785 3786 3787
	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
3788

3789
	auth_data->expected_transaction = 2;
3790

3791 3792 3793 3794 3795
	if (auth_data->algorithm == WLAN_AUTH_SAE) {
		trans = auth_data->sae_trans;
		status = auth_data->sae_status;
		auth_data->expected_transaction = trans;
	}
J
Johannes Berg 已提交
3796

3797 3798 3799
	if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
		tx_flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
			   IEEE80211_TX_INTFL_MLME_CONN_TX;
J
Johannes Berg 已提交
3800

3801 3802 3803 3804 3805
	ieee80211_send_auth(sdata, trans, auth_data->algorithm, status,
			    auth_data->data, auth_data->data_len,
			    auth_data->bss->bssid,
			    auth_data->bss->bssid, NULL, 0, 0,
			    tx_flags);
J
Johannes Berg 已提交
3806

3807
	if (tx_flags == 0) {
3808
		auth_data->timeout = jiffies + IEEE80211_AUTH_TIMEOUT;
3809
		auth_data->timeout_started = true;
3810
		run_again(sdata, auth_data->timeout);
3811
	} else {
3812 3813 3814 3815
		auth_data->timeout =
			round_jiffies_up(jiffies + IEEE80211_AUTH_TIMEOUT_LONG);
		auth_data->timeout_started = true;
		run_again(sdata, auth_data->timeout);
3816
	}
J
Johannes Berg 已提交
3817 3818 3819 3820 3821 3822 3823 3824 3825

	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;

3826
	sdata_assert_lock(sdata);
J
Johannes Berg 已提交
3827 3828 3829

	assoc_data->tries++;
	if (assoc_data->tries > IEEE80211_ASSOC_MAX_TRIES) {
J
Johannes Berg 已提交
3830 3831
		sdata_info(sdata, "association with %pM timed out\n",
			   assoc_data->bss->bssid);
J
Johannes Berg 已提交
3832 3833 3834 3835 3836 3837 3838 3839 3840 3841

		/*
		 * 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
3842 3843 3844
	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
3845 3846
	ieee80211_send_assoc(sdata);

3847
	if (!ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
3848
		assoc_data->timeout = jiffies + IEEE80211_ASSOC_TIMEOUT;
3849
		assoc_data->timeout_started = true;
3850
		run_again(sdata, assoc_data->timeout);
3851
	} else {
3852 3853 3854 3855 3856
		assoc_data->timeout =
			round_jiffies_up(jiffies +
					 IEEE80211_ASSOC_TIMEOUT_LONG);
		assoc_data->timeout_started = true;
		run_again(sdata, assoc_data->timeout);
3857
	}
J
Johannes Berg 已提交
3858 3859 3860 3861

	return 0;
}

3862 3863 3864 3865 3866 3867 3868 3869 3870 3871 3872 3873
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);
}

3874
void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
J
Johannes Berg 已提交
3875 3876
{
	struct ieee80211_local *local = sdata->local;
3877
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
J
Johannes Berg 已提交
3878

3879
	sdata_lock(sdata);
3880

3881 3882 3883 3884 3885
	if (ifmgd->status_received) {
		__le16 fc = ifmgd->status_fc;
		bool status_acked = ifmgd->status_acked;

		ifmgd->status_received = false;
3886
		if (ifmgd->auth_data && ieee80211_is_auth(fc)) {
3887 3888 3889
			if (status_acked) {
				ifmgd->auth_data->timeout =
					jiffies + IEEE80211_AUTH_TIMEOUT_SHORT;
3890
				run_again(sdata, ifmgd->auth_data->timeout);
3891 3892 3893
			} else {
				ifmgd->auth_data->timeout = jiffies - 1;
			}
3894
			ifmgd->auth_data->timeout_started = true;
3895 3896 3897 3898 3899 3900
		} 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;
3901
				run_again(sdata, ifmgd->assoc_data->timeout);
3902 3903 3904
			} else {
				ifmgd->assoc_data->timeout = jiffies - 1;
			}
3905
			ifmgd->assoc_data->timeout_started = true;
3906 3907 3908
		}
	}

3909
	if (ifmgd->auth_data && ifmgd->auth_data->timeout_started &&
J
Johannes Berg 已提交
3910 3911 3912 3913 3914 3915 3916
	    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);
3917
		} else if (ieee80211_auth(sdata)) {
J
Johannes Berg 已提交
3918
			u8 bssid[ETH_ALEN];
3919 3920 3921 3922 3923
			struct ieee80211_event event = {
				.type = MLME_EVENT,
				.u.mlme.data = AUTH_EVENT,
				.u.mlme.status = MLME_TIMEOUT,
			};
J
Johannes Berg 已提交
3924 3925 3926 3927 3928

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

			ieee80211_destroy_auth_data(sdata, false);

3929
			cfg80211_auth_timeout(sdata->dev, bssid);
3930
			drv_event_callback(sdata->local, sdata, &event);
J
Johannes Berg 已提交
3931
		}
3932
	} else if (ifmgd->auth_data && ifmgd->auth_data->timeout_started)
3933
		run_again(sdata, ifmgd->auth_data->timeout);
J
Johannes Berg 已提交
3934

3935
	if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started &&
J
Johannes Berg 已提交
3936
	    time_after(jiffies, ifmgd->assoc_data->timeout)) {
3937
		if ((ifmgd->assoc_data->need_beacon && !ifmgd->have_beacon) ||
J
Johannes Berg 已提交
3938
		    ieee80211_do_assoc(sdata)) {
3939
			struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
3940 3941 3942 3943 3944
			struct ieee80211_event event = {
				.type = MLME_EVENT,
				.u.mlme.data = ASSOC_EVENT,
				.u.mlme.status = MLME_TIMEOUT,
			};
J
Johannes Berg 已提交
3945

3946
			ieee80211_destroy_assoc_data(sdata, false, false);
3947
			cfg80211_assoc_timeout(sdata->dev, bss);
3948
			drv_event_callback(sdata->local, sdata, &event);
J
Johannes Berg 已提交
3949
		}
3950
	} else if (ifmgd->assoc_data && ifmgd->assoc_data->timeout_started)
3951
		run_again(sdata, ifmgd->assoc_data->timeout);
J
Johannes Berg 已提交
3952

3953
	if (ifmgd->flags & IEEE80211_STA_CONNECTION_POLL &&
J
Johannes Berg 已提交
3954
	    ifmgd->associated) {
3955
		u8 bssid[ETH_ALEN];
3956
		int max_tries;
3957

3958
		memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
3959

3960
		if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS))
3961
			max_tries = max_nullfunc_tries;
3962
		else
3963
			max_tries = max_probe_tries;
3964

3965 3966 3967
		/* ACK received for nullfunc probing frame */
		if (!ifmgd->probe_send_count)
			ieee80211_reset_ap_probe(sdata);
3968 3969
		else if (ifmgd->nullfunc_failed) {
			if (ifmgd->probe_send_count < max_tries) {
J
Johannes Berg 已提交
3970 3971 3972 3973
				mlme_dbg(sdata,
					 "No ack for nullfunc frame to AP %pM, try %d/%i\n",
					 bssid, ifmgd->probe_send_count,
					 max_tries);
3974 3975
				ieee80211_mgd_probe_ap_send(sdata);
			} else {
J
Johannes Berg 已提交
3976 3977 3978
				mlme_dbg(sdata,
					 "No ack for nullfunc frame to AP %pM, disconnecting.\n",
					 bssid);
3979
				ieee80211_sta_connection_lost(sdata, bssid,
3980 3981
					WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
					false);
3982 3983
			}
		} else if (time_is_after_jiffies(ifmgd->probe_timeout))
3984
			run_again(sdata, ifmgd->probe_timeout);
3985
		else if (ieee80211_hw_check(&local->hw, REPORTS_TX_ACK_STATUS)) {
J
Johannes Berg 已提交
3986 3987 3988
			mlme_dbg(sdata,
				 "Failed to send nullfunc to AP %pM after %dms, disconnecting\n",
				 bssid, probe_wait_ms);
3989
			ieee80211_sta_connection_lost(sdata, bssid,
3990
				WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
3991
		} else if (ifmgd->probe_send_count < max_tries) {
J
Johannes Berg 已提交
3992 3993 3994 3995
			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);
3996 3997
			ieee80211_mgd_probe_ap_send(sdata);
		} else {
J
Johannes Berg 已提交
3998 3999 4000 4001
			/*
			 * We actually lost the connection ... or did we?
			 * Let's make sure!
			 */
4002 4003 4004
			mlme_dbg(sdata,
				 "No probe response from AP %pM after %dms, disconnecting.\n",
				 bssid, probe_wait_ms);
4005

4006
			ieee80211_sta_connection_lost(sdata, bssid,
4007
				WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY, false);
J
Johannes Berg 已提交
4008 4009 4010
		}
	}

4011
	sdata_unlock(sdata);
4012 4013
}

J
Johannes Berg 已提交
4014 4015 4016 4017
static void ieee80211_sta_bcn_mon_timer(unsigned long data)
{
	struct ieee80211_sub_if_data *sdata =
		(struct ieee80211_sub_if_data *) data;
4018
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
J
Johannes Berg 已提交
4019

4020
	if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
M
Michal Kazior 已提交
4021 4022
		return;

4023
	sdata->u.mgd.connection_loss = false;
4024 4025
	ieee80211_queue_work(&sdata->local->hw,
			     &sdata->u.mgd.beacon_connection_loss_work);
J
Johannes Berg 已提交
4026 4027 4028 4029 4030 4031 4032 4033 4034
}

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;

4035
	if (sdata->vif.csa_active && !ifmgd->csa_waiting_bcn)
M
Michal Kazior 已提交
4036 4037
		return;

4038
	ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
J
Johannes Berg 已提交
4039 4040 4041 4042 4043 4044 4045 4046 4047 4048 4049
}

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
4050 4051
static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
{
4052
	if (sdata->vif.type == NL80211_IFTYPE_STATION) {
4053
		__ieee80211_stop_poll(sdata);
4054

J
Johannes Berg 已提交
4055
		/* let's probe the connection once */
4056
		if (!ieee80211_hw_check(&sdata->local->hw, CONNECTION_MONITOR))
4057 4058
			ieee80211_queue_work(&sdata->local->hw,
					     &sdata->u.mgd.monitor_work);
4059
	}
J
Johannes Berg 已提交
4060
}
4061

4062
#ifdef CONFIG_PM
4063 4064 4065 4066 4067 4068 4069
void ieee80211_mgd_quiesce(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];

	sdata_lock(sdata);

4070 4071 4072 4073 4074
	if (ifmgd->auth_data || ifmgd->assoc_data) {
		const u8 *bssid = ifmgd->auth_data ?
				ifmgd->auth_data->bss->bssid :
				ifmgd->assoc_data->bss->bssid;

4075
		/*
4076 4077 4078
		 * If we are trying to authenticate / associate while suspending,
		 * cfg80211 won't know and won't actually abort those attempts,
		 * thus we need to do that ourselves.
4079
		 */
4080
		ieee80211_send_deauth_disassoc(sdata, bssid,
4081 4082 4083
					       IEEE80211_STYPE_DEAUTH,
					       WLAN_REASON_DEAUTH_LEAVING,
					       false, frame_buf);
4084
		if (ifmgd->assoc_data)
4085
			ieee80211_destroy_assoc_data(sdata, false, true);
4086 4087
		if (ifmgd->auth_data)
			ieee80211_destroy_auth_data(sdata, false);
4088 4089 4090 4091
		cfg80211_tx_mlme_mgmt(sdata->dev, frame_buf,
				      IEEE80211_DEAUTH_FRAME_LEN);
	}

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 4118 4119
	/* This is a bit of a hack - we should find a better and more generic
	 * solution to this. Normally when suspending, cfg80211 will in fact
	 * deauthenticate. However, it doesn't (and cannot) stop an ongoing
	 * auth (not so important) or assoc (this is the problem) process.
	 *
	 * As a consequence, it can happen that we are in the process of both
	 * associating and suspending, and receive an association response
	 * after cfg80211 has checked if it needs to disconnect, but before
	 * we actually set the flag to drop incoming frames. This will then
	 * cause the workqueue flush to process the association response in
	 * the suspend, resulting in a successful association just before it
	 * tries to remove the interface from the driver, which now though
	 * has a channel context assigned ... this results in issues.
	 *
	 * To work around this (for now) simply deauth here again if we're
	 * now connected.
	 */
	if (ifmgd->associated && !sdata->local->wowlan) {
		u8 bssid[ETH_ALEN];
		struct cfg80211_deauth_request req = {
			.reason_code = WLAN_REASON_DEAUTH_LEAVING,
			.bssid = bssid,
		};

		memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
		ieee80211_mgd_deauth(sdata, &req);
	}

4120 4121 4122
	sdata_unlock(sdata);
}

4123 4124 4125 4126
void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

4127
	sdata_lock(sdata);
4128
	if (!ifmgd->associated) {
4129
		sdata_unlock(sdata);
4130 4131 4132 4133 4134 4135 4136 4137 4138 4139
		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);
4140
		sdata_unlock(sdata);
4141 4142
		return;
	}
4143
	sdata_unlock(sdata);
4144 4145 4146
}
#endif

J
Johannes Berg 已提交
4147 4148
/* interface setup */
void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
4149
{
4150
	struct ieee80211_if_managed *ifmgd;
J
Johannes Berg 已提交
4151

4152
	ifmgd = &sdata->u.mgd;
J
Johannes Berg 已提交
4153
	INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
4154
	INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
4155 4156
	INIT_WORK(&ifmgd->beacon_connection_loss_work,
		  ieee80211_beacon_connection_loss_work);
4157 4158
	INIT_WORK(&ifmgd->csa_connection_drop_work,
		  ieee80211_csa_connection_drop_work);
4159
	INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_mgd_work);
4160 4161
	INIT_DELAYED_WORK(&ifmgd->tdls_peer_del_work,
			  ieee80211_tdls_peer_del_work);
4162
	setup_timer(&ifmgd->timer, ieee80211_sta_timer,
S
Sujith 已提交
4163
		    (unsigned long) sdata);
J
Johannes Berg 已提交
4164 4165 4166 4167
	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);
4168
	setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
J
Johannes Berg 已提交
4169
		    (unsigned long) sdata);
4170 4171
	INIT_DELAYED_WORK(&ifmgd->tx_tspec_wk,
			  ieee80211_sta_handle_tspec_ac_params_wk);
J
Johannes Berg 已提交
4172

4173
	ifmgd->flags = 0;
4174
	ifmgd->powersave = sdata->wdev.ps;
4175 4176
	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
4177
	ifmgd->p2p_noa_index = -1;
J
Johannes Berg 已提交
4178

4179
	if (sdata->local->hw.wiphy->features & NL80211_FEATURE_DYNAMIC_SMPS)
4180 4181 4182
		ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
	else
		ifmgd->req_smps = IEEE80211_SMPS_OFF;
4183 4184 4185 4186 4187

	/* Setup TDLS data */
	spin_lock_init(&ifmgd->teardown_lock);
	ifmgd->teardown_skb = NULL;
	ifmgd->orig_teardown_skb = NULL;
4188 4189
}

4190 4191
/* scan finished notification */
void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
J
Johannes Berg 已提交
4192
{
4193
	struct ieee80211_sub_if_data *sdata;
J
Johannes Berg 已提交
4194

4195 4196
	/* Restart STA timers */
	rcu_read_lock();
4197 4198 4199 4200
	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
		if (ieee80211_sdata_running(sdata))
			ieee80211_restart_sta_timer(sdata);
	}
4201 4202
	rcu_read_unlock();
}
J
Johannes Berg 已提交
4203

J
Johannes Berg 已提交
4204 4205 4206 4207 4208 4209 4210 4211 4212 4213 4214 4215
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;

4216
	ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
J
Johannes Berg 已提交
4217 4218 4219 4220 4221 4222 4223 4224 4225 4226 4227 4228
	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;

4229
	vht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_VHT_CAPABILITY);
J
Johannes Berg 已提交
4230 4231 4232 4233 4234 4235 4236 4237 4238 4239 4240 4241 4242 4243 4244 4245 4246 4247
	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;
}

4248 4249
static int ieee80211_prep_channel(struct ieee80211_sub_if_data *sdata,
				  struct cfg80211_bss *cbss)
4250 4251 4252
{
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4253
	const struct ieee80211_ht_cap *ht_cap = NULL;
4254
	const struct ieee80211_ht_operation *ht_oper = NULL;
J
Johannes Berg 已提交
4255
	const struct ieee80211_vht_operation *vht_oper = NULL;
4256
	struct ieee80211_supported_band *sband;
4257
	struct cfg80211_chan_def chandef;
J
Johannes Berg 已提交
4258
	int ret;
4259 4260
	u32 i;
	bool have_80mhz;
4261

4262 4263
	sband = local->hw.wiphy->bands[cbss->channel->band];

J
Johannes Berg 已提交
4264 4265 4266 4267
	ifmgd->flags &= ~(IEEE80211_STA_DISABLE_40MHZ |
			  IEEE80211_STA_DISABLE_80P80MHZ |
			  IEEE80211_STA_DISABLE_160MHZ);

4268 4269
	rcu_read_lock();

J
Johannes Berg 已提交
4270 4271
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT) &&
	    sband->ht_cap.ht_supported) {
4272
		const u8 *ht_oper_ie, *ht_cap_ie;
4273

4274
		ht_oper_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_OPERATION);
4275 4276
		if (ht_oper_ie && ht_oper_ie[1] >= sizeof(*ht_oper))
			ht_oper = (void *)(ht_oper_ie + 2);
4277

4278 4279 4280 4281 4282
		ht_cap_ie = ieee80211_bss_get_ie(cbss, WLAN_EID_HT_CAPABILITY);
		if (ht_cap_ie && ht_cap_ie[1] >= sizeof(*ht_cap))
			ht_cap = (void *)(ht_cap_ie + 2);

		if (!ht_cap) {
4283 4284 4285
			ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
			ht_oper = NULL;
		}
4286 4287
	}

J
Johannes Berg 已提交
4288 4289
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
	    sband->vht_cap.vht_supported) {
4290
		const u8 *vht_oper_ie, *vht_cap;
J
Johannes Berg 已提交
4291

4292 4293
		vht_oper_ie = ieee80211_bss_get_ie(cbss,
						   WLAN_EID_VHT_OPERATION);
J
Johannes Berg 已提交
4294 4295 4296 4297
		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
4298
			sdata_info(sdata,
J
Johannes Berg 已提交
4299
				   "AP advertised VHT without HT, disabling both\n");
4300 4301
			ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
			ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4302
		}
4303 4304 4305 4306 4307 4308

		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;
		}
4309 4310
	}

4311 4312 4313 4314 4315 4316 4317 4318 4319 4320 4321 4322 4323 4324
	/* Allow VHT if at least one channel on the sband supports 80 MHz */
	have_80mhz = false;
	for (i = 0; i < sband->n_channels; i++) {
		if (sband->channels[i].flags & (IEEE80211_CHAN_DISABLED |
						IEEE80211_CHAN_NO_80MHZ))
			continue;

		have_80mhz = true;
		break;
	}

	if (!have_80mhz)
		ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;

J
Johannes Berg 已提交
4325 4326
	ifmgd->flags |= ieee80211_determine_chantype(sdata, sband,
						     cbss->channel,
4327
						     ht_cap, ht_oper, vht_oper,
4328
						     &chandef, false);
4329

J
Johannes Berg 已提交
4330 4331
	sdata->needed_rx_chains = min(ieee80211_ht_vht_rx_chains(sdata, cbss),
				      local->rx_chains);
4332

4333 4334
	rcu_read_unlock();

4335 4336 4337
	/* will change later if needed */
	sdata->smps_mode = IEEE80211_SMPS_OFF;

4338
	mutex_lock(&local->mtx);
J
Johannes Berg 已提交
4339 4340 4341 4342 4343 4344 4345
	/*
	 * 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);
4346 4347 4348 4349

	/* don't downgrade for 5 and 10 MHz channels, though. */
	if (chandef.width == NL80211_CHAN_WIDTH_5 ||
	    chandef.width == NL80211_CHAN_WIDTH_10)
4350
		goto out;
4351

4352
	while (ret && chandef.width != NL80211_CHAN_WIDTH_20_NOHT) {
4353
		ifmgd->flags |= ieee80211_chandef_downgrade(&chandef);
4354 4355 4356
		ret = ieee80211_vif_use_channel(sdata, &chandef,
						IEEE80211_CHANCTX_SHARED);
	}
4357 4358
 out:
	mutex_unlock(&local->mtx);
J
Johannes Berg 已提交
4359
	return ret;
4360 4361 4362
}

static int ieee80211_prep_connection(struct ieee80211_sub_if_data *sdata,
4363 4364
				     struct cfg80211_bss *cbss, bool assoc,
				     bool override)
4365 4366 4367 4368 4369
{
	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;
4370
	struct ieee80211_supported_band *sband;
4371
	bool have_sta = false;
4372 4373
	int err;

4374 4375
	sband = local->hw.wiphy->bands[cbss->channel->band];

4376 4377 4378
	if (WARN_ON(!ifmgd->auth_data && !ifmgd->assoc_data))
		return -EINVAL;

4379 4380 4381 4382
	/* If a reconfig is happening, bail out */
	if (local->in_reconfig)
		return -EBUSY;

4383 4384 4385 4386 4387 4388 4389 4390 4391 4392 4393
	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;
	}
4394

4395
	if (new_sta || override) {
4396 4397 4398 4399 4400 4401 4402 4403
		err = ieee80211_prep_channel(sdata, cbss);
		if (err) {
			if (new_sta)
				sta_info_free(local, new_sta);
			return -EINVAL;
		}
	}

J
Johannes Berg 已提交
4404
	if (new_sta) {
4405 4406 4407
		u32 rates = 0, basic_rates = 0;
		bool have_higher_than_11mbit;
		int min_rate = INT_MAX, min_rate_index = -1;
J
Johannes Berg 已提交
4408
		const struct cfg80211_bss_ies *ies;
4409
		int shift = ieee80211_vif_get_shift(&sdata->vif);
4410 4411 4412 4413 4414

		ieee80211_get_rates(sband, bss->supp_rates,
				    bss->supp_rates_len,
				    &rates, &basic_rates,
				    &have_higher_than_11mbit,
4415
				    &min_rate, &min_rate_index,
4416
				    shift);
4417 4418 4419 4420 4421 4422 4423 4424 4425 4426

		/*
		 * 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
4427 4428
			sdata_info(sdata,
				   "No basic rates, using min rate instead\n");
4429 4430 4431
			basic_rates = BIT(min_rate_index);
		}

J
Johannes Berg 已提交
4432
		new_sta->sta.supp_rates[cbss->channel->band] = rates;
4433 4434 4435
		sdata->vif.bss_conf.basic_rates = basic_rates;

		/* cf. IEEE 802.11 9.2.12 */
4436
		if (cbss->channel->band == NL80211_BAND_2GHZ &&
4437 4438 4439 4440 4441 4442 4443
		    have_higher_than_11mbit)
			sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
		else
			sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;

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

4444 4445
		/* set timing information */
		sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
J
Johannes Berg 已提交
4446
		rcu_read_lock();
4447 4448 4449 4450 4451 4452 4453 4454 4455 4456 4457 4458 4459
		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;
4460 4461
		} else if (!ieee80211_hw_check(&sdata->local->hw,
					       TIMING_BEACON_ONLY)) {
4462 4463 4464 4465 4466 4467 4468 4469 4470 4471 4472
			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
4473
		rcu_read_unlock();
4474 4475

		/* tell driver about BSSID, basic rates and timing */
4476
		ieee80211_bss_info_change_notify(sdata,
4477 4478
			BSS_CHANGED_BSSID | BSS_CHANGED_BASIC_RATES |
			BSS_CHANGED_BEACON_INT);
4479 4480

		if (assoc)
J
Johannes Berg 已提交
4481
			sta_info_pre_move_state(new_sta, IEEE80211_STA_AUTH);
4482

J
Johannes Berg 已提交
4483 4484
		err = sta_info_insert(new_sta);
		new_sta = NULL;
4485
		if (err) {
J
Johannes Berg 已提交
4486 4487 4488
			sdata_info(sdata,
				   "failed to insert STA entry for the AP (error %d)\n",
				   err);
4489 4490 4491
			return err;
		}
	} else
4492
		WARN_ON_ONCE(!ether_addr_equal(ifmgd->bssid, cbss->bssid));
4493

4494 4495 4496 4497
	/* Cancel scan to ensure that nothing interferes with connection */
	if (local->scanning)
		ieee80211_scan_cancel(local);

4498 4499 4500
	return 0;
}

4501 4502 4503
/* config hooks */
int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
		       struct cfg80211_auth_request *req)
J
Johannes Berg 已提交
4504
{
J
Johannes Berg 已提交
4505 4506 4507
	struct ieee80211_local *local = sdata->local;
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
	struct ieee80211_mgd_auth_data *auth_data;
4508
	u16 auth_alg;
J
Johannes Berg 已提交
4509 4510 4511
	int err;

	/* prepare auth data structure */
J
Johannes Berg 已提交
4512

4513 4514 4515 4516 4517
	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
4518
		if (IS_ERR(local->wep_tx_tfm))
4519
			return -EOPNOTSUPP;
4520 4521 4522 4523 4524 4525 4526 4527
		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;
4528 4529 4530
	case NL80211_AUTHTYPE_SAE:
		auth_alg = WLAN_AUTH_SAE;
		break;
4531 4532 4533 4534 4535 4536 4537 4538 4539
	case NL80211_AUTHTYPE_FILS_SK:
		auth_alg = WLAN_AUTH_FILS_SK;
		break;
	case NL80211_AUTHTYPE_FILS_SK_PFS:
		auth_alg = WLAN_AUTH_FILS_SK_PFS;
		break;
	case NL80211_AUTHTYPE_FILS_PK:
		auth_alg = WLAN_AUTH_FILS_PK;
		break;
4540 4541
	default:
		return -EOPNOTSUPP;
J
Johannes Berg 已提交
4542
	}
4543

4544
	auth_data = kzalloc(sizeof(*auth_data) + req->auth_data_len +
4545
			    req->ie_len, GFP_KERNEL);
J
Johannes Berg 已提交
4546
	if (!auth_data)
J
Johannes Berg 已提交
4547
		return -ENOMEM;
4548

J
Johannes Berg 已提交
4549
	auth_data->bss = req->bss;
4550

4551
	if (req->auth_data_len >= 4) {
4552 4553 4554 4555 4556 4557
		if (req->auth_type == NL80211_AUTHTYPE_SAE) {
			__le16 *pos = (__le16 *) req->auth_data;

			auth_data->sae_trans = le16_to_cpu(pos[0]);
			auth_data->sae_status = le16_to_cpu(pos[1]);
		}
4558 4559 4560
		memcpy(auth_data->data, req->auth_data + 4,
		       req->auth_data_len - 4);
		auth_data->data_len += req->auth_data_len - 4;
4561 4562
	}

4563
	if (req->ie && req->ie_len) {
4564 4565 4566
		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
4567
	}
4568

J
Johannes Berg 已提交
4569
	if (req->key && req->key_len) {
J
Johannes Berg 已提交
4570 4571 4572
		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
4573 4574
	}

J
Johannes Berg 已提交
4575
	auth_data->algorithm = auth_alg;
J
Johannes Berg 已提交
4576

J
Johannes Berg 已提交
4577
	/* try to authenticate/probe */
4578

J
Johannes Berg 已提交
4579 4580 4581 4582
	if ((ifmgd->auth_data && !ifmgd->auth_data->done) ||
	    ifmgd->assoc_data) {
		err = -EBUSY;
		goto err_free;
4583 4584
	}

J
Johannes Berg 已提交
4585 4586
	if (ifmgd->auth_data)
		ieee80211_destroy_auth_data(sdata, false);
4587

J
Johannes Berg 已提交
4588 4589
	/* prep auth_data so we don't go into idle on disassoc */
	ifmgd->auth_data = auth_data;
J
Johannes Berg 已提交
4590

4591 4592 4593
	if (ifmgd->associated) {
		u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];

4594 4595 4596
		sdata_info(sdata,
			   "disconnect from AP %pM for new auth to %pM\n",
			   ifmgd->associated->bssid, req->bss->bssid);
4597 4598 4599 4600
		ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
				       WLAN_REASON_UNSPECIFIED,
				       false, frame_buf);

4601 4602 4603
		ieee80211_report_disconnect(sdata, frame_buf,
					    sizeof(frame_buf), true,
					    WLAN_REASON_UNSPECIFIED);
4604
	}
J
Johannes Berg 已提交
4605

J
Johannes Berg 已提交
4606
	sdata_info(sdata, "authenticate with %pM\n", req->bss->bssid);
4607

4608
	err = ieee80211_prep_connection(sdata, req->bss, false, false);
4609
	if (err)
J
Johannes Berg 已提交
4610
		goto err_clear;
J
Johannes Berg 已提交
4611

4612
	err = ieee80211_auth(sdata);
J
Johannes Berg 已提交
4613 4614 4615 4616 4617 4618
	if (err) {
		sta_info_destroy_addr(sdata, req->bss->bssid);
		goto err_clear;
	}

	/* hold our own reference */
4619
	cfg80211_ref_bss(local->hw.wiphy, auth_data->bss);
4620
	return 0;
J
Johannes Berg 已提交
4621 4622

 err_clear:
4623
	eth_zero_addr(ifmgd->bssid);
4624
	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
J
Johannes Berg 已提交
4625
	ifmgd->auth_data = NULL;
4626 4627 4628
	mutex_lock(&sdata->local->mtx);
	ieee80211_vif_release_channel(sdata);
	mutex_unlock(&sdata->local->mtx);
J
Johannes Berg 已提交
4629 4630 4631
 err_free:
	kfree(auth_data);
	return err;
J
Johannes Berg 已提交
4632 4633
}

4634 4635
int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
			struct cfg80211_assoc_request *req)
4636
{
J
Johannes Berg 已提交
4637
	struct ieee80211_local *local = sdata->local;
4638
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4639
	struct ieee80211_bss *bss = (void *)req->bss->priv;
J
Johannes Berg 已提交
4640
	struct ieee80211_mgd_assoc_data *assoc_data;
4641
	const struct cfg80211_bss_ies *beacon_ies;
J
Johannes Berg 已提交
4642
	struct ieee80211_supported_band *sband;
4643
	const u8 *ssidie, *ht_ie, *vht_ie;
4644
	int i, err;
4645
	bool override = false;
4646

J
Johannes Berg 已提交
4647 4648 4649 4650
	assoc_data = kzalloc(sizeof(*assoc_data) + req->ie_len, GFP_KERNEL);
	if (!assoc_data)
		return -ENOMEM;

4651 4652 4653 4654 4655 4656 4657 4658 4659 4660 4661
	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();

4662 4663 4664
	if (ifmgd->associated) {
		u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];

4665 4666 4667
		sdata_info(sdata,
			   "disconnect from AP %pM for new assoc to %pM\n",
			   ifmgd->associated->bssid, req->bss->bssid);
4668 4669 4670 4671
		ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
				       WLAN_REASON_UNSPECIFIED,
				       false, frame_buf);

4672 4673 4674
		ieee80211_report_disconnect(sdata, frame_buf,
					    sizeof(frame_buf), true,
					    WLAN_REASON_UNSPECIFIED);
4675
	}
J
Johannes Berg 已提交
4676 4677 4678 4679

	if (ifmgd->auth_data && !ifmgd->auth_data->done) {
		err = -EBUSY;
		goto err_free;
J
Johannes Berg 已提交
4680
	}
4681

J
Johannes Berg 已提交
4682 4683 4684 4685
	if (ifmgd->assoc_data) {
		err = -EBUSY;
		goto err_free;
	}
4686

J
Johannes Berg 已提交
4687 4688 4689 4690
	if (ifmgd->auth_data) {
		bool match;

		/* keep sta info, bssid if matching */
4691
		match = ether_addr_equal(ifmgd->bssid, req->bss->bssid);
J
Johannes Berg 已提交
4692
		ieee80211_destroy_auth_data(sdata, match);
4693 4694
	}

J
Johannes Berg 已提交
4695
	/* prepare assoc data */
4696

4697 4698
	ifmgd->beacon_crc_valid = false;

4699 4700 4701
	assoc_data->wmm = bss->wmm_used &&
			  (local->hw.queues >= IEEE80211_NUM_ACS);

J
Johannes Berg 已提交
4702 4703 4704 4705 4706 4707 4708
	/*
	 * 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.
	 */
4709
	for (i = 0; i < req->crypto.n_ciphers_pairwise; i++) {
4710 4711
		if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
		    req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
4712
		    req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104) {
4713
			ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4714
			ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4715
			netdev_info(sdata->dev,
4716
				    "disabling HT/VHT due to WEP/TKIP use\n");
4717 4718
		}
	}
4719

J
Johannes Berg 已提交
4720 4721 4722
	/* 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 ||
4723 4724
	    local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
	    ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4725
		ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4726 4727
		if (!bss->wmm_used &&
		    !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4728 4729
			netdev_info(sdata->dev,
				    "disabling HT as WMM/QoS is not supported by the AP\n");
4730
	}
J
Johannes Berg 已提交
4731

4732 4733
	/* disable VHT if we don't support it or the AP doesn't use WMM */
	if (!sband->vht_cap.vht_supported ||
4734 4735
	    local->hw.queues < IEEE80211_NUM_ACS || !bss->wmm_used ||
	    ifmgd->flags & IEEE80211_STA_DISABLE_WMM) {
4736
		ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
4737 4738
		if (!bss->wmm_used &&
		    !(ifmgd->flags & IEEE80211_STA_DISABLE_WMM))
4739 4740
			netdev_info(sdata->dev,
				    "disabling VHT as WMM/QoS is not supported by the AP\n");
4741 4742
	}

B
Ben Greear 已提交
4743 4744 4745 4746
	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));

4747 4748 4749 4750
	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));

4751
	if (req->ie && req->ie_len) {
J
Johannes Berg 已提交
4752 4753 4754
		memcpy(assoc_data->ie, req->ie, req->ie_len);
		assoc_data->ie_len = req->ie_len;
	}
4755

4756 4757 4758 4759 4760 4761 4762 4763 4764 4765 4766 4767 4768 4769 4770
	if (req->fils_kek) {
		/* should already be checked in cfg80211 - so warn */
		if (WARN_ON(req->fils_kek_len > FILS_MAX_KEK_LEN)) {
			err = -EINVAL;
			goto err_free;
		}
		memcpy(assoc_data->fils_kek, req->fils_kek,
		       req->fils_kek_len);
		assoc_data->fils_kek_len = req->fils_kek_len;
	}

	if (req->fils_nonces)
		memcpy(assoc_data->fils_nonces, req->fils_nonces,
		       2 * FILS_NONCE_LEN);

J
Johannes Berg 已提交
4771
	assoc_data->bss = req->bss;
4772

J
Johannes Berg 已提交
4773 4774
	if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
		if (ifmgd->powersave)
4775
			sdata->smps_mode = IEEE80211_SMPS_DYNAMIC;
J
Johannes Berg 已提交
4776
		else
4777
			sdata->smps_mode = IEEE80211_SMPS_OFF;
J
Johannes Berg 已提交
4778
	} else
4779
		sdata->smps_mode = ifmgd->req_smps;
J
Johannes Berg 已提交
4780

J
Johannes Berg 已提交
4781 4782 4783
	assoc_data->capability = req->bss->capability;
	assoc_data->supp_rates = bss->supp_rates;
	assoc_data->supp_rates_len = bss->supp_rates_len;
4784

4785
	rcu_read_lock();
4786 4787 4788 4789 4790
	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
4791
		ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
4792 4793 4794 4795 4796 4797
	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;
4798
	rcu_read_unlock();
4799

4800
	if (WARN((sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD) &&
4801
		 ieee80211_hw_check(&local->hw, PS_NULLFUNC_STACK),
4802 4803 4804
	     "U-APSD not supported with HW_PS_NULLFUNC_STACK\n"))
		sdata->vif.driver_flags &= ~IEEE80211_VIF_SUPPORTS_UAPSD;

K
Kalle Valo 已提交
4805
	if (bss->wmm_used && bss->uapsd_supported &&
4806
	    (sdata->vif.driver_flags & IEEE80211_VIF_SUPPORTS_UAPSD)) {
4807
		assoc_data->uapsd = true;
K
Kalle Valo 已提交
4808 4809
		ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
	} else {
4810
		assoc_data->uapsd = false;
K
Kalle Valo 已提交
4811 4812 4813
		ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
	}

4814
	if (req->prev_bssid)
J
Johannes Berg 已提交
4815
		memcpy(assoc_data->prev_bssid, req->prev_bssid, ETH_ALEN);
4816 4817 4818 4819 4820 4821 4822 4823 4824

	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;
	}

4825 4826 4827 4828 4829
	if (req->flags & ASSOC_REQ_USE_RRM)
		ifmgd->flags |= IEEE80211_STA_ENABLE_RRM;
	else
		ifmgd->flags &= ~IEEE80211_STA_ENABLE_RRM;

4830 4831 4832 4833 4834
	if (req->crypto.control_port)
		ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
	else
		ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;

4835 4836
	sdata->control_port_protocol = req->crypto.control_port_ethertype;
	sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
4837 4838
	sdata->encrypt_headroom = ieee80211_cs_headroom(local, &req->crypto,
							sdata->vif.type);
4839

J
Johannes Berg 已提交
4840 4841 4842
	/* kick off associate process */

	ifmgd->assoc_data = assoc_data;
4843
	ifmgd->dtim_period = 0;
4844
	ifmgd->have_beacon = false;
J
Johannes Berg 已提交
4845

4846 4847 4848 4849 4850 4851 4852 4853 4854 4855 4856 4857 4858 4859 4860 4861 4862 4863 4864 4865 4866 4867 4868 4869 4870 4871 4872 4873 4874 4875
	/* override HT/VHT configuration only if the AP and we support it */
	if (!(ifmgd->flags & IEEE80211_STA_DISABLE_HT)) {
		struct ieee80211_sta_ht_cap sta_ht_cap;

		if (req->flags & ASSOC_REQ_DISABLE_HT)
			override = true;

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

		/* check for 40 MHz disable override */
		if (!(ifmgd->flags & IEEE80211_STA_DISABLE_40MHZ) &&
		    sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
		    !(sta_ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40))
			override = true;

		if (!(ifmgd->flags & IEEE80211_STA_DISABLE_VHT) &&
		    req->flags & ASSOC_REQ_DISABLE_VHT)
			override = true;
	}

	if (req->flags & ASSOC_REQ_DISABLE_HT) {
		ifmgd->flags |= IEEE80211_STA_DISABLE_HT;
		ifmgd->flags |= IEEE80211_STA_DISABLE_VHT;
	}

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

	err = ieee80211_prep_connection(sdata, req->bss, true, override);
4876 4877
	if (err)
		goto err_clear;
J
Johannes Berg 已提交
4878

4879 4880
	rcu_read_lock();
	beacon_ies = rcu_dereference(req->bss->beacon_ies);
4881

4882
	if (ieee80211_hw_check(&sdata->local->hw, NEED_DTIM_BEFORE_ASSOC) &&
4883 4884 4885 4886 4887 4888 4889 4890
	    !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);
4891
		assoc_data->timeout_started = true;
4892 4893 4894 4895 4896
		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);
4897 4898
		u8 dtim_count = 0;

4899 4900 4901 4902
		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;
4903
			dtim_count = tim->dtim_count;
4904
		}
4905
		ifmgd->have_beacon = true;
J
Johannes Berg 已提交
4906
		assoc_data->timeout = jiffies;
4907
		assoc_data->timeout_started = true;
4908

4909
		if (ieee80211_hw_check(&local->hw, TIMING_BEACON_ONLY)) {
4910 4911 4912 4913 4914
			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;
		}
4915 4916
	} else {
		assoc_data->timeout = jiffies;
4917
		assoc_data->timeout_started = true;
J
Johannes Berg 已提交
4918
	}
4919 4920
	rcu_read_unlock();

4921
	run_again(sdata, assoc_data->timeout);
J
Johannes Berg 已提交
4922

P
Paul Stewart 已提交
4923 4924 4925 4926 4927 4928 4929 4930 4931 4932
	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
4933 4934
		sdata_info(sdata, "associating with AP with corrupt %s\n",
			   corrupt_type);
P
Paul Stewart 已提交
4935 4936
	}

4937
	return 0;
J
Johannes Berg 已提交
4938
 err_clear:
4939
	eth_zero_addr(ifmgd->bssid);
4940
	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_BSSID);
J
Johannes Berg 已提交
4941 4942 4943 4944
	ifmgd->assoc_data = NULL;
 err_free:
	kfree(assoc_data);
	return err;
4945 4946
}

4947
int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
4948
			 struct cfg80211_deauth_request *req)
4949
{
4950
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
4951
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
4952
	bool tx = !req->local_state_change;
4953

4954 4955 4956 4957 4958 4959
	if (ifmgd->auth_data &&
	    ether_addr_equal(ifmgd->auth_data->bss->bssid, req->bssid)) {
		sdata_info(sdata,
			   "aborting authentication with %pM by local choice (Reason: %u=%s)\n",
			   req->bssid, req->reason_code,
			   ieee80211_get_reason_code_string(req->reason_code));
4960

4961
		drv_mgd_prepare_tx(sdata->local, sdata);
4962 4963
		ieee80211_send_deauth_disassoc(sdata, req->bssid,
					       IEEE80211_STYPE_DEAUTH,
4964
					       req->reason_code, tx,
4965
					       frame_buf);
4966
		ieee80211_destroy_auth_data(sdata, false);
4967 4968 4969
		ieee80211_report_disconnect(sdata, frame_buf,
					    sizeof(frame_buf), true,
					    req->reason_code);
4970

4971
		return 0;
4972 4973
	}

4974 4975 4976 4977 4978 4979 4980 4981 4982 4983 4984 4985
	if (ifmgd->assoc_data &&
	    ether_addr_equal(ifmgd->assoc_data->bss->bssid, req->bssid)) {
		sdata_info(sdata,
			   "aborting association with %pM by local choice (Reason: %u=%s)\n",
			   req->bssid, req->reason_code,
			   ieee80211_get_reason_code_string(req->reason_code));

		drv_mgd_prepare_tx(sdata->local, sdata);
		ieee80211_send_deauth_disassoc(sdata, req->bssid,
					       IEEE80211_STYPE_DEAUTH,
					       req->reason_code, tx,
					       frame_buf);
4986
		ieee80211_destroy_assoc_data(sdata, false, true);
4987 4988 4989 4990 4991 4992
		ieee80211_report_disconnect(sdata, frame_buf,
					    sizeof(frame_buf), true,
					    req->reason_code);
		return 0;
	}

4993 4994
	if (ifmgd->associated &&
	    ether_addr_equal(ifmgd->associated->bssid, req->bssid)) {
4995 4996 4997 4998 4999
		sdata_info(sdata,
			   "deauthenticating from %pM by local choice (Reason: %u=%s)\n",
			   req->bssid, req->reason_code,
			   ieee80211_get_reason_code_string(req->reason_code));

5000 5001
		ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DEAUTH,
				       req->reason_code, tx, frame_buf);
5002 5003 5004
		ieee80211_report_disconnect(sdata, frame_buf,
					    sizeof(frame_buf), true,
					    req->reason_code);
5005 5006
		return 0;
	}
5007

5008
	return -ENOTCONN;
5009
}
5010

5011
int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
5012
			   struct cfg80211_disassoc_request *req)
J
Johannes Berg 已提交
5013
{
5014
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
5015
	u8 bssid[ETH_ALEN];
5016
	u8 frame_buf[IEEE80211_DEAUTH_FRAME_LEN];
J
Johannes Berg 已提交
5017

J
Johannes Berg 已提交
5018 5019 5020 5021 5022 5023
	/*
	 * 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.
	 */
5024
	if (ifmgd->associated != req->bss)
5025 5026
		return -ENOLINK;

J
Johannes Berg 已提交
5027
	sdata_info(sdata,
5028 5029
		   "disassociating from %pM by local choice (Reason: %u=%s)\n",
		   req->bss->bssid, req->reason_code, ieee80211_get_reason_code_string(req->reason_code));
5030

5031
	memcpy(bssid, req->bss->bssid, ETH_ALEN);
5032 5033 5034
	ieee80211_set_disassoc(sdata, IEEE80211_STYPE_DISASSOC,
			       req->reason_code, !req->local_state_change,
			       frame_buf);
5035

5036 5037
	ieee80211_report_disconnect(sdata, frame_buf, sizeof(frame_buf), true,
				    req->reason_code);
5038

5039 5040
	return 0;
}
5041

5042
void ieee80211_mgd_stop(struct ieee80211_sub_if_data *sdata)
5043 5044 5045
{
	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;

5046 5047 5048 5049 5050 5051 5052 5053 5054 5055
	/*
	 * 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);
5056
	cancel_delayed_work_sync(&ifmgd->tdls_peer_del_work);
5057

5058
	sdata_lock(sdata);
5059 5060
	if (ifmgd->assoc_data) {
		struct cfg80211_bss *bss = ifmgd->assoc_data->bss;
5061
		ieee80211_destroy_assoc_data(sdata, false, false);
5062 5063
		cfg80211_assoc_timeout(sdata->dev, bss);
	}
5064 5065
	if (ifmgd->auth_data)
		ieee80211_destroy_auth_data(sdata, false);
5066 5067 5068 5069 5070 5071 5072
	spin_lock_bh(&ifmgd->teardown_lock);
	if (ifmgd->teardown_skb) {
		kfree_skb(ifmgd->teardown_skb);
		ifmgd->teardown_skb = NULL;
		ifmgd->orig_teardown_skb = NULL;
	}
	spin_unlock_bh(&ifmgd->teardown_lock);
5073
	del_timer_sync(&ifmgd->timer);
5074
	sdata_unlock(sdata);
5075 5076
}

5077 5078
void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
			       enum nl80211_cqm_rssi_threshold_event rssi_event,
5079
			       s32 rssi_level,
5080 5081 5082 5083
			       gfp_t gfp)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);

5084
	trace_api_cqm_rssi_notify(sdata, rssi_event, rssi_level);
J
Johannes Berg 已提交
5085

5086
	cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, rssi_level, gfp);
5087 5088
}
EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
5089 5090 5091 5092 5093 5094 5095 5096 5097 5098

void ieee80211_cqm_beacon_loss_notify(struct ieee80211_vif *vif, gfp_t gfp)
{
	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);

	trace_api_cqm_beacon_loss_notify(sdata->local, sdata);

	cfg80211_cqm_beacon_loss_notify(sdata->dev, gfp);
}
EXPORT_SYMBOL(ieee80211_cqm_beacon_loss_notify);