xref: /openbmc/linux/net/mac80211/mlme.c (revision 81d67439)
1 /*
2  * BSS client mode implementation
3  * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
4  * Copyright 2004, Instant802 Networks, Inc.
5  * Copyright 2005, Devicescape Software, Inc.
6  * Copyright 2006-2007	Jiri Benc <jbenc@suse.cz>
7  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License version 2 as
11  * published by the Free Software Foundation.
12  */
13 
14 #include <linux/delay.h>
15 #include <linux/if_ether.h>
16 #include <linux/skbuff.h>
17 #include <linux/if_arp.h>
18 #include <linux/etherdevice.h>
19 #include <linux/rtnetlink.h>
20 #include <linux/pm_qos_params.h>
21 #include <linux/crc32.h>
22 #include <linux/slab.h>
23 #include <net/mac80211.h>
24 #include <asm/unaligned.h>
25 
26 #include "ieee80211_i.h"
27 #include "driver-ops.h"
28 #include "rate.h"
29 #include "led.h"
30 
31 static int max_nullfunc_tries = 2;
32 module_param(max_nullfunc_tries, int, 0644);
33 MODULE_PARM_DESC(max_nullfunc_tries,
34 		 "Maximum nullfunc tx tries before disconnecting (reason 4).");
35 
36 static int max_probe_tries = 5;
37 module_param(max_probe_tries, int, 0644);
38 MODULE_PARM_DESC(max_probe_tries,
39 		 "Maximum probe tries before disconnecting (reason 4).");
40 
41 /*
42  * Beacon loss timeout is calculated as N frames times the
43  * advertised beacon interval.  This may need to be somewhat
44  * higher than what hardware might detect to account for
45  * delays in the host processing frames. But since we also
46  * probe on beacon miss before declaring the connection lost
47  * default to what we want.
48  */
49 #define IEEE80211_BEACON_LOSS_COUNT	7
50 
51 /*
52  * Time the connection can be idle before we probe
53  * it to see if we can still talk to the AP.
54  */
55 #define IEEE80211_CONNECTION_IDLE_TIME	(30 * HZ)
56 /*
57  * Time we wait for a probe response after sending
58  * a probe request because of beacon loss or for
59  * checking the connection still works.
60  */
61 static int probe_wait_ms = 500;
62 module_param(probe_wait_ms, int, 0644);
63 MODULE_PARM_DESC(probe_wait_ms,
64 		 "Maximum time(ms) to wait for probe response"
65 		 " before disconnecting (reason 4).");
66 
67 /*
68  * Weight given to the latest Beacon frame when calculating average signal
69  * strength for Beacon frames received in the current BSS. This must be
70  * between 1 and 15.
71  */
72 #define IEEE80211_SIGNAL_AVE_WEIGHT	3
73 
74 /*
75  * How many Beacon frames need to have been used in average signal strength
76  * before starting to indicate signal change events.
77  */
78 #define IEEE80211_SIGNAL_AVE_MIN_COUNT	4
79 
80 #define TMR_RUNNING_TIMER	0
81 #define TMR_RUNNING_CHANSW	1
82 
83 /*
84  * All cfg80211 functions have to be called outside a locked
85  * section so that they can acquire a lock themselves... This
86  * is much simpler than queuing up things in cfg80211, but we
87  * do need some indirection for that here.
88  */
89 enum rx_mgmt_action {
90 	/* no action required */
91 	RX_MGMT_NONE,
92 
93 	/* caller must call cfg80211_send_deauth() */
94 	RX_MGMT_CFG80211_DEAUTH,
95 
96 	/* caller must call cfg80211_send_disassoc() */
97 	RX_MGMT_CFG80211_DISASSOC,
98 };
99 
100 /* utils */
101 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
102 {
103 	lockdep_assert_held(&ifmgd->mtx);
104 }
105 
106 /*
107  * We can have multiple work items (and connection probing)
108  * scheduling this timer, but we need to take care to only
109  * reschedule it when it should fire _earlier_ than it was
110  * asked for before, or if it's not pending right now. This
111  * function ensures that. Note that it then is required to
112  * run this function for all timeouts after the first one
113  * has happened -- the work that runs from this timer will
114  * do that.
115  */
116 static void run_again(struct ieee80211_if_managed *ifmgd,
117 			     unsigned long timeout)
118 {
119 	ASSERT_MGD_MTX(ifmgd);
120 
121 	if (!timer_pending(&ifmgd->timer) ||
122 	    time_before(timeout, ifmgd->timer.expires))
123 		mod_timer(&ifmgd->timer, timeout);
124 }
125 
126 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
127 {
128 	if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
129 		return;
130 
131 	mod_timer(&sdata->u.mgd.bcn_mon_timer,
132 		  round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
133 }
134 
135 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
136 {
137 	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
138 
139 	if (unlikely(!sdata->u.mgd.associated))
140 		return;
141 
142 	if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
143 		return;
144 
145 	mod_timer(&sdata->u.mgd.conn_mon_timer,
146 		  round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
147 
148 	ifmgd->probe_send_count = 0;
149 }
150 
151 static int ecw2cw(int ecw)
152 {
153 	return (1 << ecw) - 1;
154 }
155 
156 /*
157  * ieee80211_enable_ht should be called only after the operating band
158  * has been determined as ht configuration depends on the hw's
159  * HT abilities for a specific band.
160  */
161 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
162 			       struct ieee80211_ht_info *hti,
163 			       const u8 *bssid, u16 ap_ht_cap_flags)
164 {
165 	struct ieee80211_local *local = sdata->local;
166 	struct ieee80211_supported_band *sband;
167 	struct sta_info *sta;
168 	u32 changed = 0;
169 	int hti_cfreq;
170 	u16 ht_opmode;
171 	bool enable_ht = true;
172 	enum nl80211_channel_type prev_chantype;
173 	enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
174 
175 	sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
176 
177 	prev_chantype = sdata->vif.bss_conf.channel_type;
178 
179 	/* HT is not supported */
180 	if (!sband->ht_cap.ht_supported)
181 		enable_ht = false;
182 
183 	if (enable_ht) {
184 		hti_cfreq = ieee80211_channel_to_frequency(hti->control_chan,
185 							   sband->band);
186 		/* check that channel matches the right operating channel */
187 		if (local->hw.conf.channel->center_freq != hti_cfreq) {
188 			/* Some APs mess this up, evidently.
189 			 * Netgear WNDR3700 sometimes reports 4 higher than
190 			 * the actual channel, for instance.
191 			 */
192 			printk(KERN_DEBUG
193 			       "%s: Wrong control channel in association"
194 			       " response: configured center-freq: %d"
195 			       " hti-cfreq: %d  hti->control_chan: %d"
196 			       " band: %d.  Disabling HT.\n",
197 			       sdata->name,
198 			       local->hw.conf.channel->center_freq,
199 			       hti_cfreq, hti->control_chan,
200 			       sband->band);
201 			enable_ht = false;
202 		}
203 	}
204 
205 	if (enable_ht) {
206 		channel_type = NL80211_CHAN_HT20;
207 
208 		if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
209 		    (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
210 		    (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
211 			switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
212 			case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
213 				if (!(local->hw.conf.channel->flags &
214 				    IEEE80211_CHAN_NO_HT40PLUS))
215 					channel_type = NL80211_CHAN_HT40PLUS;
216 				break;
217 			case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
218 				if (!(local->hw.conf.channel->flags &
219 				    IEEE80211_CHAN_NO_HT40MINUS))
220 					channel_type = NL80211_CHAN_HT40MINUS;
221 				break;
222 			}
223 		}
224 	}
225 
226 	if (local->tmp_channel)
227 		local->tmp_channel_type = channel_type;
228 
229 	if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
230 		/* can only fail due to HT40+/- mismatch */
231 		channel_type = NL80211_CHAN_HT20;
232 		WARN_ON(!ieee80211_set_channel_type(local, sdata, channel_type));
233 	}
234 
235 	/* channel_type change automatically detected */
236 	ieee80211_hw_config(local, 0);
237 
238 	if (prev_chantype != channel_type) {
239 		rcu_read_lock();
240 		sta = sta_info_get(sdata, bssid);
241 		if (sta)
242 			rate_control_rate_update(local, sband, sta,
243 						 IEEE80211_RC_HT_CHANGED,
244 						 channel_type);
245 		rcu_read_unlock();
246 	}
247 
248 	ht_opmode = le16_to_cpu(hti->operation_mode);
249 
250 	/* if bss configuration changed store the new one */
251 	if (sdata->ht_opmode_valid != enable_ht ||
252 	    sdata->vif.bss_conf.ht_operation_mode != ht_opmode ||
253 	    prev_chantype != channel_type) {
254 		changed |= BSS_CHANGED_HT;
255 		sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
256 		sdata->ht_opmode_valid = enable_ht;
257 	}
258 
259 	return changed;
260 }
261 
262 /* frame sending functions */
263 
264 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
265 					   const u8 *bssid, u16 stype, u16 reason,
266 					   void *cookie, bool send_frame)
267 {
268 	struct ieee80211_local *local = sdata->local;
269 	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
270 	struct sk_buff *skb;
271 	struct ieee80211_mgmt *mgmt;
272 
273 	skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
274 	if (!skb) {
275 		printk(KERN_DEBUG "%s: failed to allocate buffer for "
276 		       "deauth/disassoc frame\n", sdata->name);
277 		return;
278 	}
279 	skb_reserve(skb, local->hw.extra_tx_headroom);
280 
281 	mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
282 	memset(mgmt, 0, 24);
283 	memcpy(mgmt->da, bssid, ETH_ALEN);
284 	memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
285 	memcpy(mgmt->bssid, bssid, ETH_ALEN);
286 	mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
287 	skb_put(skb, 2);
288 	/* u.deauth.reason_code == u.disassoc.reason_code */
289 	mgmt->u.deauth.reason_code = cpu_to_le16(reason);
290 
291 	if (stype == IEEE80211_STYPE_DEAUTH)
292 		if (cookie)
293 			__cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
294 		else
295 			cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
296 	else
297 		if (cookie)
298 			__cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
299 		else
300 			cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
301 	if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
302 		IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
303 
304 	if (send_frame)
305 		ieee80211_tx_skb(sdata, skb);
306 	else
307 		kfree_skb(skb);
308 }
309 
310 void ieee80211_send_pspoll(struct ieee80211_local *local,
311 			   struct ieee80211_sub_if_data *sdata)
312 {
313 	struct ieee80211_pspoll *pspoll;
314 	struct sk_buff *skb;
315 
316 	skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
317 	if (!skb)
318 		return;
319 
320 	pspoll = (struct ieee80211_pspoll *) skb->data;
321 	pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
322 
323 	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
324 	ieee80211_tx_skb(sdata, skb);
325 }
326 
327 void ieee80211_send_nullfunc(struct ieee80211_local *local,
328 			     struct ieee80211_sub_if_data *sdata,
329 			     int powersave)
330 {
331 	struct sk_buff *skb;
332 	struct ieee80211_hdr_3addr *nullfunc;
333 
334 	skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
335 	if (!skb)
336 		return;
337 
338 	nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
339 	if (powersave)
340 		nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
341 
342 	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
343 	ieee80211_tx_skb(sdata, skb);
344 }
345 
346 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
347 					  struct ieee80211_sub_if_data *sdata)
348 {
349 	struct sk_buff *skb;
350 	struct ieee80211_hdr *nullfunc;
351 	__le16 fc;
352 
353 	if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
354 		return;
355 
356 	skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
357 	if (!skb) {
358 		printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr "
359 		       "nullfunc frame\n", sdata->name);
360 		return;
361 	}
362 	skb_reserve(skb, local->hw.extra_tx_headroom);
363 
364 	nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
365 	memset(nullfunc, 0, 30);
366 	fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
367 			 IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
368 	nullfunc->frame_control = fc;
369 	memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
370 	memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
371 	memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
372 	memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
373 
374 	IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
375 	ieee80211_tx_skb(sdata, skb);
376 }
377 
378 /* spectrum management related things */
379 static void ieee80211_chswitch_work(struct work_struct *work)
380 {
381 	struct ieee80211_sub_if_data *sdata =
382 		container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
383 	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
384 
385 	if (!ieee80211_sdata_running(sdata))
386 		return;
387 
388 	mutex_lock(&ifmgd->mtx);
389 	if (!ifmgd->associated)
390 		goto out;
391 
392 	sdata->local->oper_channel = sdata->local->csa_channel;
393 	if (!sdata->local->ops->channel_switch) {
394 		/* call "hw_config" only if doing sw channel switch */
395 		ieee80211_hw_config(sdata->local,
396 			IEEE80211_CONF_CHANGE_CHANNEL);
397 	}
398 
399 	/* XXX: shouldn't really modify cfg80211-owned data! */
400 	ifmgd->associated->channel = sdata->local->oper_channel;
401 
402 	ieee80211_wake_queues_by_reason(&sdata->local->hw,
403 					IEEE80211_QUEUE_STOP_REASON_CSA);
404  out:
405 	ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
406 	mutex_unlock(&ifmgd->mtx);
407 }
408 
409 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
410 {
411 	struct ieee80211_sub_if_data *sdata;
412 	struct ieee80211_if_managed *ifmgd;
413 
414 	sdata = vif_to_sdata(vif);
415 	ifmgd = &sdata->u.mgd;
416 
417 	trace_api_chswitch_done(sdata, success);
418 	if (!success) {
419 		/*
420 		 * If the channel switch was not successful, stay
421 		 * around on the old channel. We currently lack
422 		 * good handling of this situation, possibly we
423 		 * should just drop the association.
424 		 */
425 		sdata->local->csa_channel = sdata->local->oper_channel;
426 	}
427 
428 	ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
429 }
430 EXPORT_SYMBOL(ieee80211_chswitch_done);
431 
432 static void ieee80211_chswitch_timer(unsigned long data)
433 {
434 	struct ieee80211_sub_if_data *sdata =
435 		(struct ieee80211_sub_if_data *) data;
436 	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
437 
438 	if (sdata->local->quiescing) {
439 		set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
440 		return;
441 	}
442 
443 	ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
444 }
445 
446 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
447 				      struct ieee80211_channel_sw_ie *sw_elem,
448 				      struct ieee80211_bss *bss,
449 				      u64 timestamp)
450 {
451 	struct cfg80211_bss *cbss =
452 		container_of((void *)bss, struct cfg80211_bss, priv);
453 	struct ieee80211_channel *new_ch;
454 	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
455 	int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num,
456 						      cbss->channel->band);
457 
458 	ASSERT_MGD_MTX(ifmgd);
459 
460 	if (!ifmgd->associated)
461 		return;
462 
463 	if (sdata->local->scanning)
464 		return;
465 
466 	/* Disregard subsequent beacons if we are already running a timer
467 	   processing a CSA */
468 
469 	if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
470 		return;
471 
472 	new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
473 	if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
474 		return;
475 
476 	sdata->local->csa_channel = new_ch;
477 
478 	if (sdata->local->ops->channel_switch) {
479 		/* use driver's channel switch callback */
480 		struct ieee80211_channel_switch ch_switch;
481 		memset(&ch_switch, 0, sizeof(ch_switch));
482 		ch_switch.timestamp = timestamp;
483 		if (sw_elem->mode) {
484 			ch_switch.block_tx = true;
485 			ieee80211_stop_queues_by_reason(&sdata->local->hw,
486 					IEEE80211_QUEUE_STOP_REASON_CSA);
487 		}
488 		ch_switch.channel = new_ch;
489 		ch_switch.count = sw_elem->count;
490 		ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
491 		drv_channel_switch(sdata->local, &ch_switch);
492 		return;
493 	}
494 
495 	/* channel switch handled in software */
496 	if (sw_elem->count <= 1) {
497 		ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
498 	} else {
499 		if (sw_elem->mode)
500 			ieee80211_stop_queues_by_reason(&sdata->local->hw,
501 					IEEE80211_QUEUE_STOP_REASON_CSA);
502 		ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
503 		mod_timer(&ifmgd->chswitch_timer,
504 			  jiffies +
505 			  msecs_to_jiffies(sw_elem->count *
506 					   cbss->beacon_interval));
507 	}
508 }
509 
510 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
511 					u16 capab_info, u8 *pwr_constr_elem,
512 					u8 pwr_constr_elem_len)
513 {
514 	struct ieee80211_conf *conf = &sdata->local->hw.conf;
515 
516 	if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
517 		return;
518 
519 	/* Power constraint IE length should be 1 octet */
520 	if (pwr_constr_elem_len != 1)
521 		return;
522 
523 	if ((*pwr_constr_elem <= conf->channel->max_power) &&
524 	    (*pwr_constr_elem != sdata->local->power_constr_level)) {
525 		sdata->local->power_constr_level = *pwr_constr_elem;
526 		ieee80211_hw_config(sdata->local, 0);
527 	}
528 }
529 
530 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif)
531 {
532 	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
533 	struct ieee80211_local *local = sdata->local;
534 	struct ieee80211_conf *conf = &local->hw.conf;
535 
536 	WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
537 		!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
538 		(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
539 
540 	local->disable_dynamic_ps = false;
541 	conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout;
542 }
543 EXPORT_SYMBOL(ieee80211_enable_dyn_ps);
544 
545 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif)
546 {
547 	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
548 	struct ieee80211_local *local = sdata->local;
549 	struct ieee80211_conf *conf = &local->hw.conf;
550 
551 	WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
552 		!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
553 		(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
554 
555 	local->disable_dynamic_ps = true;
556 	conf->dynamic_ps_timeout = 0;
557 	del_timer_sync(&local->dynamic_ps_timer);
558 	ieee80211_queue_work(&local->hw,
559 			     &local->dynamic_ps_enable_work);
560 }
561 EXPORT_SYMBOL(ieee80211_disable_dyn_ps);
562 
563 /* powersave */
564 static void ieee80211_enable_ps(struct ieee80211_local *local,
565 				struct ieee80211_sub_if_data *sdata)
566 {
567 	struct ieee80211_conf *conf = &local->hw.conf;
568 
569 	/*
570 	 * If we are scanning right now then the parameters will
571 	 * take effect when scan finishes.
572 	 */
573 	if (local->scanning)
574 		return;
575 
576 	if (conf->dynamic_ps_timeout > 0 &&
577 	    !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
578 		mod_timer(&local->dynamic_ps_timer, jiffies +
579 			  msecs_to_jiffies(conf->dynamic_ps_timeout));
580 	} else {
581 		if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
582 			ieee80211_send_nullfunc(local, sdata, 1);
583 
584 		if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
585 		    (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
586 			return;
587 
588 		conf->flags |= IEEE80211_CONF_PS;
589 		ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
590 	}
591 }
592 
593 static void ieee80211_change_ps(struct ieee80211_local *local)
594 {
595 	struct ieee80211_conf *conf = &local->hw.conf;
596 
597 	if (local->ps_sdata) {
598 		ieee80211_enable_ps(local, local->ps_sdata);
599 	} else if (conf->flags & IEEE80211_CONF_PS) {
600 		conf->flags &= ~IEEE80211_CONF_PS;
601 		ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
602 		del_timer_sync(&local->dynamic_ps_timer);
603 		cancel_work_sync(&local->dynamic_ps_enable_work);
604 	}
605 }
606 
607 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
608 {
609 	struct ieee80211_if_managed *mgd = &sdata->u.mgd;
610 	struct sta_info *sta = NULL;
611 	u32 sta_flags = 0;
612 
613 	if (!mgd->powersave)
614 		return false;
615 
616 	if (!mgd->associated)
617 		return false;
618 
619 	if (!mgd->associated->beacon_ies)
620 		return false;
621 
622 	if (mgd->flags & (IEEE80211_STA_BEACON_POLL |
623 			  IEEE80211_STA_CONNECTION_POLL))
624 		return false;
625 
626 	rcu_read_lock();
627 	sta = sta_info_get(sdata, mgd->bssid);
628 	if (sta)
629 		sta_flags = get_sta_flags(sta);
630 	rcu_read_unlock();
631 
632 	if (!(sta_flags & WLAN_STA_AUTHORIZED))
633 		return false;
634 
635 	return true;
636 }
637 
638 /* need to hold RTNL or interface lock */
639 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
640 {
641 	struct ieee80211_sub_if_data *sdata, *found = NULL;
642 	int count = 0;
643 	int timeout;
644 
645 	if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
646 		local->ps_sdata = NULL;
647 		return;
648 	}
649 
650 	if (!list_empty(&local->work_list)) {
651 		local->ps_sdata = NULL;
652 		goto change;
653 	}
654 
655 	list_for_each_entry(sdata, &local->interfaces, list) {
656 		if (!ieee80211_sdata_running(sdata))
657 			continue;
658 		if (sdata->vif.type == NL80211_IFTYPE_AP) {
659 			/* If an AP vif is found, then disable PS
660 			 * by setting the count to zero thereby setting
661 			 * ps_sdata to NULL.
662 			 */
663 			count = 0;
664 			break;
665 		}
666 		if (sdata->vif.type != NL80211_IFTYPE_STATION)
667 			continue;
668 		found = sdata;
669 		count++;
670 	}
671 
672 	if (count == 1 && ieee80211_powersave_allowed(found)) {
673 		struct ieee80211_conf *conf = &local->hw.conf;
674 		s32 beaconint_us;
675 
676 		if (latency < 0)
677 			latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
678 
679 		beaconint_us = ieee80211_tu_to_usec(
680 					found->vif.bss_conf.beacon_int);
681 
682 		timeout = local->dynamic_ps_forced_timeout;
683 		if (timeout < 0) {
684 			/*
685 			 * Go to full PSM if the user configures a very low
686 			 * latency requirement.
687 			 * The 2000 second value is there for compatibility
688 			 * until the PM_QOS_NETWORK_LATENCY is configured
689 			 * with real values.
690 			 */
691 			if (latency > (1900 * USEC_PER_MSEC) &&
692 			    latency != (2000 * USEC_PER_SEC))
693 				timeout = 0;
694 			else
695 				timeout = 100;
696 		}
697 		local->dynamic_ps_user_timeout = timeout;
698 		if (!local->disable_dynamic_ps)
699 			conf->dynamic_ps_timeout =
700 				local->dynamic_ps_user_timeout;
701 
702 		if (beaconint_us > latency) {
703 			local->ps_sdata = NULL;
704 		} else {
705 			struct ieee80211_bss *bss;
706 			int maxslp = 1;
707 			u8 dtimper;
708 
709 			bss = (void *)found->u.mgd.associated->priv;
710 			dtimper = bss->dtim_period;
711 
712 			/* If the TIM IE is invalid, pretend the value is 1 */
713 			if (!dtimper)
714 				dtimper = 1;
715 			else if (dtimper > 1)
716 				maxslp = min_t(int, dtimper,
717 						    latency / beaconint_us);
718 
719 			local->hw.conf.max_sleep_period = maxslp;
720 			local->hw.conf.ps_dtim_period = dtimper;
721 			local->ps_sdata = found;
722 		}
723 	} else {
724 		local->ps_sdata = NULL;
725 	}
726 
727  change:
728 	ieee80211_change_ps(local);
729 }
730 
731 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
732 {
733 	struct ieee80211_local *local =
734 		container_of(work, struct ieee80211_local,
735 			     dynamic_ps_disable_work);
736 
737 	if (local->hw.conf.flags & IEEE80211_CONF_PS) {
738 		local->hw.conf.flags &= ~IEEE80211_CONF_PS;
739 		ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
740 	}
741 
742 	ieee80211_wake_queues_by_reason(&local->hw,
743 					IEEE80211_QUEUE_STOP_REASON_PS);
744 }
745 
746 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
747 {
748 	struct ieee80211_local *local =
749 		container_of(work, struct ieee80211_local,
750 			     dynamic_ps_enable_work);
751 	struct ieee80211_sub_if_data *sdata = local->ps_sdata;
752 	struct ieee80211_if_managed *ifmgd;
753 	unsigned long flags;
754 	int q;
755 
756 	/* can only happen when PS was just disabled anyway */
757 	if (!sdata)
758 		return;
759 
760 	ifmgd = &sdata->u.mgd;
761 
762 	if (local->hw.conf.flags & IEEE80211_CONF_PS)
763 		return;
764 
765 	if (!local->disable_dynamic_ps &&
766 	    local->hw.conf.dynamic_ps_timeout > 0) {
767 		/* don't enter PS if TX frames are pending */
768 		if (drv_tx_frames_pending(local)) {
769 			mod_timer(&local->dynamic_ps_timer, jiffies +
770 				  msecs_to_jiffies(
771 				  local->hw.conf.dynamic_ps_timeout));
772 			return;
773 		}
774 
775 		/*
776 		 * transmission can be stopped by others which leads to
777 		 * dynamic_ps_timer expiry. Postpone the ps timer if it
778 		 * is not the actual idle state.
779 		 */
780 		spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
781 		for (q = 0; q < local->hw.queues; q++) {
782 			if (local->queue_stop_reasons[q]) {
783 				spin_unlock_irqrestore(&local->queue_stop_reason_lock,
784 						       flags);
785 				mod_timer(&local->dynamic_ps_timer, jiffies +
786 					  msecs_to_jiffies(
787 					  local->hw.conf.dynamic_ps_timeout));
788 				return;
789 			}
790 		}
791 		spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
792 	}
793 
794 	if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
795 	    (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED))) {
796 		netif_tx_stop_all_queues(sdata->dev);
797 
798 		if (drv_tx_frames_pending(local))
799 			mod_timer(&local->dynamic_ps_timer, jiffies +
800 				  msecs_to_jiffies(
801 				  local->hw.conf.dynamic_ps_timeout));
802 		else {
803 			ieee80211_send_nullfunc(local, sdata, 1);
804 			/* Flush to get the tx status of nullfunc frame */
805 			drv_flush(local, false);
806 		}
807 	}
808 
809 	if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
810 	      (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
811 	    (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
812 		ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
813 		local->hw.conf.flags |= IEEE80211_CONF_PS;
814 		ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
815 	}
816 
817 	if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
818 		netif_tx_wake_all_queues(sdata->dev);
819 }
820 
821 void ieee80211_dynamic_ps_timer(unsigned long data)
822 {
823 	struct ieee80211_local *local = (void *) data;
824 
825 	if (local->quiescing || local->suspended)
826 		return;
827 
828 	ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
829 }
830 
831 /* MLME */
832 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
833 				     struct ieee80211_sub_if_data *sdata,
834 				     u8 *wmm_param, size_t wmm_param_len)
835 {
836 	struct ieee80211_tx_queue_params params;
837 	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
838 	size_t left;
839 	int count;
840 	u8 *pos, uapsd_queues = 0;
841 
842 	if (!local->ops->conf_tx)
843 		return;
844 
845 	if (local->hw.queues < 4)
846 		return;
847 
848 	if (!wmm_param)
849 		return;
850 
851 	if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
852 		return;
853 
854 	if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
855 		uapsd_queues = local->uapsd_queues;
856 
857 	count = wmm_param[6] & 0x0f;
858 	if (count == ifmgd->wmm_last_param_set)
859 		return;
860 	ifmgd->wmm_last_param_set = count;
861 
862 	pos = wmm_param + 8;
863 	left = wmm_param_len - 8;
864 
865 	memset(&params, 0, sizeof(params));
866 
867 	local->wmm_acm = 0;
868 	for (; left >= 4; left -= 4, pos += 4) {
869 		int aci = (pos[0] >> 5) & 0x03;
870 		int acm = (pos[0] >> 4) & 0x01;
871 		bool uapsd = false;
872 		int queue;
873 
874 		switch (aci) {
875 		case 1: /* AC_BK */
876 			queue = 3;
877 			if (acm)
878 				local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
879 			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
880 				uapsd = true;
881 			break;
882 		case 2: /* AC_VI */
883 			queue = 1;
884 			if (acm)
885 				local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
886 			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
887 				uapsd = true;
888 			break;
889 		case 3: /* AC_VO */
890 			queue = 0;
891 			if (acm)
892 				local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
893 			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
894 				uapsd = true;
895 			break;
896 		case 0: /* AC_BE */
897 		default:
898 			queue = 2;
899 			if (acm)
900 				local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
901 			if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
902 				uapsd = true;
903 			break;
904 		}
905 
906 		params.aifs = pos[0] & 0x0f;
907 		params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
908 		params.cw_min = ecw2cw(pos[1] & 0x0f);
909 		params.txop = get_unaligned_le16(pos + 2);
910 		params.uapsd = uapsd;
911 
912 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
913 		wiphy_debug(local->hw.wiphy,
914 			    "WMM queue=%d aci=%d acm=%d aifs=%d "
915 			    "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
916 			    queue, aci, acm,
917 			    params.aifs, params.cw_min, params.cw_max,
918 			    params.txop, params.uapsd);
919 #endif
920 		if (drv_conf_tx(local, queue, &params))
921 			wiphy_debug(local->hw.wiphy,
922 				    "failed to set TX queue parameters for queue %d\n",
923 				    queue);
924 	}
925 
926 	/* enable WMM or activate new settings */
927 	sdata->vif.bss_conf.qos = true;
928 	ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
929 }
930 
931 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
932 					   u16 capab, bool erp_valid, u8 erp)
933 {
934 	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
935 	u32 changed = 0;
936 	bool use_protection;
937 	bool use_short_preamble;
938 	bool use_short_slot;
939 
940 	if (erp_valid) {
941 		use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
942 		use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
943 	} else {
944 		use_protection = false;
945 		use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
946 	}
947 
948 	use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
949 	if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
950 		use_short_slot = true;
951 
952 	if (use_protection != bss_conf->use_cts_prot) {
953 		bss_conf->use_cts_prot = use_protection;
954 		changed |= BSS_CHANGED_ERP_CTS_PROT;
955 	}
956 
957 	if (use_short_preamble != bss_conf->use_short_preamble) {
958 		bss_conf->use_short_preamble = use_short_preamble;
959 		changed |= BSS_CHANGED_ERP_PREAMBLE;
960 	}
961 
962 	if (use_short_slot != bss_conf->use_short_slot) {
963 		bss_conf->use_short_slot = use_short_slot;
964 		changed |= BSS_CHANGED_ERP_SLOT;
965 	}
966 
967 	return changed;
968 }
969 
970 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
971 				     struct cfg80211_bss *cbss,
972 				     u32 bss_info_changed)
973 {
974 	struct ieee80211_bss *bss = (void *)cbss->priv;
975 	struct ieee80211_local *local = sdata->local;
976 	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
977 
978 	bss_info_changed |= BSS_CHANGED_ASSOC;
979 	/* set timing information */
980 	bss_conf->beacon_int = cbss->beacon_interval;
981 	bss_conf->timestamp = cbss->tsf;
982 
983 	bss_info_changed |= BSS_CHANGED_BEACON_INT;
984 	bss_info_changed |= ieee80211_handle_bss_capability(sdata,
985 		cbss->capability, bss->has_erp_value, bss->erp_value);
986 
987 	sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
988 		IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int));
989 
990 	sdata->u.mgd.associated = cbss;
991 	memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
992 
993 	sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
994 
995 	/* just to be sure */
996 	sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
997 				IEEE80211_STA_BEACON_POLL);
998 
999 	ieee80211_led_assoc(local, 1);
1000 
1001 	if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
1002 		bss_conf->dtim_period = bss->dtim_period;
1003 	else
1004 		bss_conf->dtim_period = 0;
1005 
1006 	bss_conf->assoc = 1;
1007 	/*
1008 	 * For now just always ask the driver to update the basic rateset
1009 	 * when we have associated, we aren't checking whether it actually
1010 	 * changed or not.
1011 	 */
1012 	bss_info_changed |= BSS_CHANGED_BASIC_RATES;
1013 
1014 	/* And the BSSID changed - we're associated now */
1015 	bss_info_changed |= BSS_CHANGED_BSSID;
1016 
1017 	/* Tell the driver to monitor connection quality (if supported) */
1018 	if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) &&
1019 	    bss_conf->cqm_rssi_thold)
1020 		bss_info_changed |= BSS_CHANGED_CQM;
1021 
1022 	/* Enable ARP filtering */
1023 	if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
1024 		bss_conf->arp_filter_enabled = sdata->arp_filter_state;
1025 		bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1026 	}
1027 
1028 	ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1029 
1030 	mutex_lock(&local->iflist_mtx);
1031 	ieee80211_recalc_ps(local, -1);
1032 	ieee80211_recalc_smps(local);
1033 	mutex_unlock(&local->iflist_mtx);
1034 
1035 	netif_tx_start_all_queues(sdata->dev);
1036 	netif_carrier_on(sdata->dev);
1037 }
1038 
1039 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1040 				   bool remove_sta, bool tx)
1041 {
1042 	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1043 	struct ieee80211_local *local = sdata->local;
1044 	struct sta_info *sta;
1045 	u32 changed = 0, config_changed = 0;
1046 	u8 bssid[ETH_ALEN];
1047 
1048 	ASSERT_MGD_MTX(ifmgd);
1049 
1050 	if (WARN_ON(!ifmgd->associated))
1051 		return;
1052 
1053 	memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1054 
1055 	ifmgd->associated = NULL;
1056 	memset(ifmgd->bssid, 0, ETH_ALEN);
1057 
1058 	/*
1059 	 * we need to commit the associated = NULL change because the
1060 	 * scan code uses that to determine whether this iface should
1061 	 * go to/wake up from powersave or not -- and could otherwise
1062 	 * wake the queues erroneously.
1063 	 */
1064 	smp_mb();
1065 
1066 	/*
1067 	 * Thus, we can only afterwards stop the queues -- to account
1068 	 * for the case where another CPU is finishing a scan at this
1069 	 * time -- we don't want the scan code to enable queues.
1070 	 */
1071 
1072 	netif_tx_stop_all_queues(sdata->dev);
1073 	netif_carrier_off(sdata->dev);
1074 
1075 	mutex_lock(&local->sta_mtx);
1076 	sta = sta_info_get(sdata, bssid);
1077 	if (sta) {
1078 		set_sta_flags(sta, WLAN_STA_BLOCK_BA);
1079 		ieee80211_sta_tear_down_BA_sessions(sta, tx);
1080 	}
1081 	mutex_unlock(&local->sta_mtx);
1082 
1083 	changed |= ieee80211_reset_erp_info(sdata);
1084 
1085 	ieee80211_led_assoc(local, 0);
1086 	changed |= BSS_CHANGED_ASSOC;
1087 	sdata->vif.bss_conf.assoc = false;
1088 
1089 	ieee80211_set_wmm_default(sdata);
1090 
1091 	/* channel(_type) changes are handled by ieee80211_hw_config */
1092 	WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
1093 
1094 	/* on the next assoc, re-program HT parameters */
1095 	sdata->ht_opmode_valid = false;
1096 
1097 	local->power_constr_level = 0;
1098 
1099 	del_timer_sync(&local->dynamic_ps_timer);
1100 	cancel_work_sync(&local->dynamic_ps_enable_work);
1101 
1102 	if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1103 		local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1104 		config_changed |= IEEE80211_CONF_CHANGE_PS;
1105 	}
1106 	local->ps_sdata = NULL;
1107 
1108 	ieee80211_hw_config(local, config_changed);
1109 
1110 	/* Disable ARP filtering */
1111 	if (sdata->vif.bss_conf.arp_filter_enabled) {
1112 		sdata->vif.bss_conf.arp_filter_enabled = false;
1113 		changed |= BSS_CHANGED_ARP_FILTER;
1114 	}
1115 
1116 	/* The BSSID (not really interesting) and HT changed */
1117 	changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1118 	ieee80211_bss_info_change_notify(sdata, changed);
1119 
1120 	if (remove_sta)
1121 		sta_info_destroy_addr(sdata, bssid);
1122 
1123 	del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1124 	del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1125 	del_timer_sync(&sdata->u.mgd.timer);
1126 	del_timer_sync(&sdata->u.mgd.chswitch_timer);
1127 }
1128 
1129 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1130 			     struct ieee80211_hdr *hdr)
1131 {
1132 	/*
1133 	 * We can postpone the mgd.timer whenever receiving unicast frames
1134 	 * from AP because we know that the connection is working both ways
1135 	 * at that time. But multicast frames (and hence also beacons) must
1136 	 * be ignored here, because we need to trigger the timer during
1137 	 * data idle periods for sending the periodic probe request to the
1138 	 * AP we're connected to.
1139 	 */
1140 	if (is_multicast_ether_addr(hdr->addr1))
1141 		return;
1142 
1143 	ieee80211_sta_reset_conn_monitor(sdata);
1144 }
1145 
1146 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1147 {
1148 	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1149 
1150 	if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1151 			      IEEE80211_STA_CONNECTION_POLL)))
1152 	    return;
1153 
1154 	ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1155 			  IEEE80211_STA_BEACON_POLL);
1156 	mutex_lock(&sdata->local->iflist_mtx);
1157 	ieee80211_recalc_ps(sdata->local, -1);
1158 	mutex_unlock(&sdata->local->iflist_mtx);
1159 
1160 	if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1161 		return;
1162 
1163 	/*
1164 	 * We've received a probe response, but are not sure whether
1165 	 * we have or will be receiving any beacons or data, so let's
1166 	 * schedule the timers again, just in case.
1167 	 */
1168 	ieee80211_sta_reset_beacon_monitor(sdata);
1169 
1170 	mod_timer(&ifmgd->conn_mon_timer,
1171 		  round_jiffies_up(jiffies +
1172 				   IEEE80211_CONNECTION_IDLE_TIME));
1173 }
1174 
1175 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1176 			     struct ieee80211_hdr *hdr, bool ack)
1177 {
1178 	if (!ieee80211_is_data(hdr->frame_control))
1179 	    return;
1180 
1181 	if (ack)
1182 		ieee80211_sta_reset_conn_monitor(sdata);
1183 
1184 	if (ieee80211_is_nullfunc(hdr->frame_control) &&
1185 	    sdata->u.mgd.probe_send_count > 0) {
1186 		if (ack)
1187 			sdata->u.mgd.probe_send_count = 0;
1188 		else
1189 			sdata->u.mgd.nullfunc_failed = true;
1190 		ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1191 	}
1192 }
1193 
1194 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1195 {
1196 	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1197 	const u8 *ssid;
1198 	u8 *dst = ifmgd->associated->bssid;
1199 	u8 unicast_limit = max(1, max_probe_tries - 3);
1200 
1201 	/*
1202 	 * Try sending broadcast probe requests for the last three
1203 	 * probe requests after the first ones failed since some
1204 	 * buggy APs only support broadcast probe requests.
1205 	 */
1206 	if (ifmgd->probe_send_count >= unicast_limit)
1207 		dst = NULL;
1208 
1209 	/*
1210 	 * When the hardware reports an accurate Tx ACK status, it's
1211 	 * better to send a nullfunc frame instead of a probe request,
1212 	 * as it will kick us off the AP quickly if we aren't associated
1213 	 * anymore. The timeout will be reset if the frame is ACKed by
1214 	 * the AP.
1215 	 */
1216 	if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1217 		ifmgd->nullfunc_failed = false;
1218 		ieee80211_send_nullfunc(sdata->local, sdata, 0);
1219 	} else {
1220 		ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1221 		ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid[1], NULL, 0,
1222 					 true);
1223 	}
1224 
1225 	ifmgd->probe_send_count++;
1226 	ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1227 	run_again(ifmgd, ifmgd->probe_timeout);
1228 }
1229 
1230 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1231 				   bool beacon)
1232 {
1233 	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1234 	bool already = false;
1235 
1236 	if (!ieee80211_sdata_running(sdata))
1237 		return;
1238 
1239 	if (sdata->local->scanning)
1240 		return;
1241 
1242 	if (sdata->local->tmp_channel)
1243 		return;
1244 
1245 	mutex_lock(&ifmgd->mtx);
1246 
1247 	if (!ifmgd->associated)
1248 		goto out;
1249 
1250 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1251 	if (beacon && net_ratelimit())
1252 		printk(KERN_DEBUG "%s: detected beacon loss from AP "
1253 		       "- sending probe request\n", sdata->name);
1254 #endif
1255 
1256 	/*
1257 	 * The driver/our work has already reported this event or the
1258 	 * connection monitoring has kicked in and we have already sent
1259 	 * a probe request. Or maybe the AP died and the driver keeps
1260 	 * reporting until we disassociate...
1261 	 *
1262 	 * In either case we have to ignore the current call to this
1263 	 * function (except for setting the correct probe reason bit)
1264 	 * because otherwise we would reset the timer every time and
1265 	 * never check whether we received a probe response!
1266 	 */
1267 	if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1268 			    IEEE80211_STA_CONNECTION_POLL))
1269 		already = true;
1270 
1271 	if (beacon)
1272 		ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1273 	else
1274 		ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1275 
1276 	if (already)
1277 		goto out;
1278 
1279 	mutex_lock(&sdata->local->iflist_mtx);
1280 	ieee80211_recalc_ps(sdata->local, -1);
1281 	mutex_unlock(&sdata->local->iflist_mtx);
1282 
1283 	ifmgd->probe_send_count = 0;
1284 	ieee80211_mgd_probe_ap_send(sdata);
1285  out:
1286 	mutex_unlock(&ifmgd->mtx);
1287 }
1288 
1289 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
1290 					  struct ieee80211_vif *vif)
1291 {
1292 	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1293 	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1294 	struct sk_buff *skb;
1295 	const u8 *ssid;
1296 
1297 	if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1298 		return NULL;
1299 
1300 	ASSERT_MGD_MTX(ifmgd);
1301 
1302 	if (!ifmgd->associated)
1303 		return NULL;
1304 
1305 	ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1306 	skb = ieee80211_build_probe_req(sdata, ifmgd->associated->bssid,
1307 					ssid + 2, ssid[1], NULL, 0, true);
1308 
1309 	return skb;
1310 }
1311 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
1312 
1313 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
1314 {
1315 	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1316 	struct ieee80211_local *local = sdata->local;
1317 	u8 bssid[ETH_ALEN];
1318 
1319 	mutex_lock(&ifmgd->mtx);
1320 	if (!ifmgd->associated) {
1321 		mutex_unlock(&ifmgd->mtx);
1322 		return;
1323 	}
1324 
1325 	memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1326 
1327 	printk(KERN_DEBUG "%s: Connection to AP %pM lost.\n",
1328 	       sdata->name, bssid);
1329 
1330 	ieee80211_set_disassoc(sdata, true, true);
1331 	mutex_unlock(&ifmgd->mtx);
1332 
1333 	mutex_lock(&local->mtx);
1334 	ieee80211_recalc_idle(local);
1335 	mutex_unlock(&local->mtx);
1336 	/*
1337 	 * must be outside lock due to cfg80211,
1338 	 * but that's not a problem.
1339 	 */
1340 	ieee80211_send_deauth_disassoc(sdata, bssid,
1341 				       IEEE80211_STYPE_DEAUTH,
1342 				       WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1343 				       NULL, true);
1344 }
1345 
1346 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1347 {
1348 	struct ieee80211_sub_if_data *sdata =
1349 		container_of(work, struct ieee80211_sub_if_data,
1350 			     u.mgd.beacon_connection_loss_work);
1351 
1352 	if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1353 		__ieee80211_connection_loss(sdata);
1354 	else
1355 		ieee80211_mgd_probe_ap(sdata, true);
1356 }
1357 
1358 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1359 {
1360 	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1361 	struct ieee80211_hw *hw = &sdata->local->hw;
1362 
1363 	trace_api_beacon_loss(sdata);
1364 
1365 	WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1366 	ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1367 }
1368 EXPORT_SYMBOL(ieee80211_beacon_loss);
1369 
1370 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1371 {
1372 	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1373 	struct ieee80211_hw *hw = &sdata->local->hw;
1374 
1375 	trace_api_connection_loss(sdata);
1376 
1377 	WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1378 	ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1379 }
1380 EXPORT_SYMBOL(ieee80211_connection_loss);
1381 
1382 
1383 static enum rx_mgmt_action __must_check
1384 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1385 			 struct ieee80211_mgmt *mgmt, size_t len)
1386 {
1387 	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1388 	const u8 *bssid = NULL;
1389 	u16 reason_code;
1390 
1391 	if (len < 24 + 2)
1392 		return RX_MGMT_NONE;
1393 
1394 	ASSERT_MGD_MTX(ifmgd);
1395 
1396 	bssid = ifmgd->associated->bssid;
1397 
1398 	reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1399 
1400 	printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1401 			sdata->name, bssid, reason_code);
1402 
1403 	ieee80211_set_disassoc(sdata, true, false);
1404 	mutex_lock(&sdata->local->mtx);
1405 	ieee80211_recalc_idle(sdata->local);
1406 	mutex_unlock(&sdata->local->mtx);
1407 
1408 	return RX_MGMT_CFG80211_DEAUTH;
1409 }
1410 
1411 
1412 static enum rx_mgmt_action __must_check
1413 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1414 			   struct ieee80211_mgmt *mgmt, size_t len)
1415 {
1416 	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1417 	u16 reason_code;
1418 
1419 	if (len < 24 + 2)
1420 		return RX_MGMT_NONE;
1421 
1422 	ASSERT_MGD_MTX(ifmgd);
1423 
1424 	if (WARN_ON(!ifmgd->associated))
1425 		return RX_MGMT_NONE;
1426 
1427 	if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
1428 		return RX_MGMT_NONE;
1429 
1430 	reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1431 
1432 	printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1433 			sdata->name, mgmt->sa, reason_code);
1434 
1435 	ieee80211_set_disassoc(sdata, true, false);
1436 	mutex_lock(&sdata->local->mtx);
1437 	ieee80211_recalc_idle(sdata->local);
1438 	mutex_unlock(&sdata->local->mtx);
1439 	return RX_MGMT_CFG80211_DISASSOC;
1440 }
1441 
1442 
1443 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1444 				    struct ieee80211_mgmt *mgmt, size_t len)
1445 {
1446 	struct ieee80211_sub_if_data *sdata = wk->sdata;
1447 	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1448 	struct ieee80211_local *local = sdata->local;
1449 	struct ieee80211_supported_band *sband;
1450 	struct sta_info *sta;
1451 	struct cfg80211_bss *cbss = wk->assoc.bss;
1452 	u8 *pos;
1453 	u32 rates, basic_rates;
1454 	u16 capab_info, aid;
1455 	struct ieee802_11_elems elems;
1456 	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1457 	u32 changed = 0;
1458 	int i, j, err;
1459 	bool have_higher_than_11mbit = false;
1460 	u16 ap_ht_cap_flags;
1461 
1462 	/* AssocResp and ReassocResp have identical structure */
1463 
1464 	aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1465 	capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1466 
1467 	if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1468 		printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1469 		       "set\n", sdata->name, aid);
1470 	aid &= ~(BIT(15) | BIT(14));
1471 
1472 	pos = mgmt->u.assoc_resp.variable;
1473 	ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1474 
1475 	if (!elems.supp_rates) {
1476 		printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1477 		       sdata->name);
1478 		return false;
1479 	}
1480 
1481 	ifmgd->aid = aid;
1482 
1483 	sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1484 	if (!sta) {
1485 		printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1486 		       " the AP\n", sdata->name);
1487 		return false;
1488 	}
1489 
1490 	set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1491 			   WLAN_STA_ASSOC_AP);
1492 	if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1493 		set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1494 
1495 	rates = 0;
1496 	basic_rates = 0;
1497 	sband = local->hw.wiphy->bands[wk->chan->band];
1498 
1499 	for (i = 0; i < elems.supp_rates_len; i++) {
1500 		int rate = (elems.supp_rates[i] & 0x7f) * 5;
1501 		bool is_basic = !!(elems.supp_rates[i] & 0x80);
1502 
1503 		if (rate > 110)
1504 			have_higher_than_11mbit = true;
1505 
1506 		for (j = 0; j < sband->n_bitrates; j++) {
1507 			if (sband->bitrates[j].bitrate == rate) {
1508 				rates |= BIT(j);
1509 				if (is_basic)
1510 					basic_rates |= BIT(j);
1511 				break;
1512 			}
1513 		}
1514 	}
1515 
1516 	for (i = 0; i < elems.ext_supp_rates_len; i++) {
1517 		int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1518 		bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1519 
1520 		if (rate > 110)
1521 			have_higher_than_11mbit = true;
1522 
1523 		for (j = 0; j < sband->n_bitrates; j++) {
1524 			if (sband->bitrates[j].bitrate == rate) {
1525 				rates |= BIT(j);
1526 				if (is_basic)
1527 					basic_rates |= BIT(j);
1528 				break;
1529 			}
1530 		}
1531 	}
1532 
1533 	sta->sta.supp_rates[wk->chan->band] = rates;
1534 	sdata->vif.bss_conf.basic_rates = basic_rates;
1535 
1536 	/* cf. IEEE 802.11 9.2.12 */
1537 	if (wk->chan->band == IEEE80211_BAND_2GHZ &&
1538 	    have_higher_than_11mbit)
1539 		sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1540 	else
1541 		sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1542 
1543 	if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1544 		ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1545 				elems.ht_cap_elem, &sta->sta.ht_cap);
1546 
1547 	ap_ht_cap_flags = sta->sta.ht_cap.cap;
1548 
1549 	rate_control_rate_init(sta);
1550 
1551 	if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1552 		set_sta_flags(sta, WLAN_STA_MFP);
1553 
1554 	if (elems.wmm_param)
1555 		set_sta_flags(sta, WLAN_STA_WME);
1556 
1557 	err = sta_info_insert(sta);
1558 	sta = NULL;
1559 	if (err) {
1560 		printk(KERN_DEBUG "%s: failed to insert STA entry for"
1561 		       " the AP (error %d)\n", sdata->name, err);
1562 		return false;
1563 	}
1564 
1565 	/*
1566 	 * Always handle WMM once after association regardless
1567 	 * of the first value the AP uses. Setting -1 here has
1568 	 * that effect because the AP values is an unsigned
1569 	 * 4-bit value.
1570 	 */
1571 	ifmgd->wmm_last_param_set = -1;
1572 
1573 	if (elems.wmm_param)
1574 		ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1575 					 elems.wmm_param_len);
1576 	else
1577 		ieee80211_set_wmm_default(sdata);
1578 
1579 	local->oper_channel = wk->chan;
1580 
1581 	if (elems.ht_info_elem && elems.wmm_param &&
1582 	    (sdata->local->hw.queues >= 4) &&
1583 	    !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1584 		changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1585 					       cbss->bssid, ap_ht_cap_flags);
1586 
1587 	/* set AID and assoc capability,
1588 	 * ieee80211_set_associated() will tell the driver */
1589 	bss_conf->aid = aid;
1590 	bss_conf->assoc_capability = capab_info;
1591 	ieee80211_set_associated(sdata, cbss, changed);
1592 
1593 	/*
1594 	 * If we're using 4-addr mode, let the AP know that we're
1595 	 * doing so, so that it can create the STA VLAN on its side
1596 	 */
1597 	if (ifmgd->use_4addr)
1598 		ieee80211_send_4addr_nullfunc(local, sdata);
1599 
1600 	/*
1601 	 * Start timer to probe the connection to the AP now.
1602 	 * Also start the timer that will detect beacon loss.
1603 	 */
1604 	ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1605 	ieee80211_sta_reset_beacon_monitor(sdata);
1606 
1607 	return true;
1608 }
1609 
1610 
1611 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1612 				  struct ieee80211_mgmt *mgmt,
1613 				  size_t len,
1614 				  struct ieee80211_rx_status *rx_status,
1615 				  struct ieee802_11_elems *elems,
1616 				  bool beacon)
1617 {
1618 	struct ieee80211_local *local = sdata->local;
1619 	int freq;
1620 	struct ieee80211_bss *bss;
1621 	struct ieee80211_channel *channel;
1622 	bool need_ps = false;
1623 
1624 	if (sdata->u.mgd.associated) {
1625 		bss = (void *)sdata->u.mgd.associated->priv;
1626 		/* not previously set so we may need to recalc */
1627 		need_ps = !bss->dtim_period;
1628 	}
1629 
1630 	if (elems->ds_params && elems->ds_params_len == 1)
1631 		freq = ieee80211_channel_to_frequency(elems->ds_params[0],
1632 						      rx_status->band);
1633 	else
1634 		freq = rx_status->freq;
1635 
1636 	channel = ieee80211_get_channel(local->hw.wiphy, freq);
1637 
1638 	if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1639 		return;
1640 
1641 	bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1642 					channel, beacon);
1643 	if (bss)
1644 		ieee80211_rx_bss_put(local, bss);
1645 
1646 	if (!sdata->u.mgd.associated)
1647 		return;
1648 
1649 	if (need_ps) {
1650 		mutex_lock(&local->iflist_mtx);
1651 		ieee80211_recalc_ps(local, -1);
1652 		mutex_unlock(&local->iflist_mtx);
1653 	}
1654 
1655 	if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1656 	    (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1657 							ETH_ALEN) == 0)) {
1658 		struct ieee80211_channel_sw_ie *sw_elem =
1659 			(struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1660 		ieee80211_sta_process_chanswitch(sdata, sw_elem,
1661 						 bss, rx_status->mactime);
1662 	}
1663 }
1664 
1665 
1666 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1667 					 struct sk_buff *skb)
1668 {
1669 	struct ieee80211_mgmt *mgmt = (void *)skb->data;
1670 	struct ieee80211_if_managed *ifmgd;
1671 	struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1672 	size_t baselen, len = skb->len;
1673 	struct ieee802_11_elems elems;
1674 
1675 	ifmgd = &sdata->u.mgd;
1676 
1677 	ASSERT_MGD_MTX(ifmgd);
1678 
1679 	if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1680 		return; /* ignore ProbeResp to foreign address */
1681 
1682 	baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1683 	if (baselen > len)
1684 		return;
1685 
1686 	ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1687 				&elems);
1688 
1689 	ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1690 
1691 	if (ifmgd->associated &&
1692 	    memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0)
1693 		ieee80211_reset_ap_probe(sdata);
1694 }
1695 
1696 /*
1697  * This is the canonical list of information elements we care about,
1698  * the filter code also gives us all changes to the Microsoft OUI
1699  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1700  *
1701  * We implement beacon filtering in software since that means we can
1702  * avoid processing the frame here and in cfg80211, and userspace
1703  * will not be able to tell whether the hardware supports it or not.
1704  *
1705  * XXX: This list needs to be dynamic -- userspace needs to be able to
1706  *	add items it requires. It also needs to be able to tell us to
1707  *	look out for other vendor IEs.
1708  */
1709 static const u64 care_about_ies =
1710 	(1ULL << WLAN_EID_COUNTRY) |
1711 	(1ULL << WLAN_EID_ERP_INFO) |
1712 	(1ULL << WLAN_EID_CHANNEL_SWITCH) |
1713 	(1ULL << WLAN_EID_PWR_CONSTRAINT) |
1714 	(1ULL << WLAN_EID_HT_CAPABILITY) |
1715 	(1ULL << WLAN_EID_HT_INFORMATION);
1716 
1717 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1718 				     struct ieee80211_mgmt *mgmt,
1719 				     size_t len,
1720 				     struct ieee80211_rx_status *rx_status)
1721 {
1722 	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1723 	struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1724 	size_t baselen;
1725 	struct ieee802_11_elems elems;
1726 	struct ieee80211_local *local = sdata->local;
1727 	u32 changed = 0;
1728 	bool erp_valid, directed_tim = false;
1729 	u8 erp_value = 0;
1730 	u32 ncrc;
1731 	u8 *bssid;
1732 
1733 	ASSERT_MGD_MTX(ifmgd);
1734 
1735 	/* Process beacon from the current BSS */
1736 	baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1737 	if (baselen > len)
1738 		return;
1739 
1740 	if (rx_status->freq != local->hw.conf.channel->center_freq)
1741 		return;
1742 
1743 	/*
1744 	 * We might have received a number of frames, among them a
1745 	 * disassoc frame and a beacon...
1746 	 */
1747 	if (!ifmgd->associated)
1748 		return;
1749 
1750 	bssid = ifmgd->associated->bssid;
1751 
1752 	/*
1753 	 * And in theory even frames from a different AP we were just
1754 	 * associated to a split-second ago!
1755 	 */
1756 	if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1757 		return;
1758 
1759 	/* Track average RSSI from the Beacon frames of the current AP */
1760 	ifmgd->last_beacon_signal = rx_status->signal;
1761 	if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
1762 		ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
1763 		ifmgd->ave_beacon_signal = rx_status->signal * 16;
1764 		ifmgd->last_cqm_event_signal = 0;
1765 		ifmgd->count_beacon_signal = 1;
1766 		ifmgd->last_ave_beacon_signal = 0;
1767 	} else {
1768 		ifmgd->ave_beacon_signal =
1769 			(IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
1770 			 (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
1771 			 ifmgd->ave_beacon_signal) / 16;
1772 		ifmgd->count_beacon_signal++;
1773 	}
1774 
1775 	if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
1776 	    ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
1777 		int sig = ifmgd->ave_beacon_signal;
1778 		int last_sig = ifmgd->last_ave_beacon_signal;
1779 
1780 		/*
1781 		 * if signal crosses either of the boundaries, invoke callback
1782 		 * with appropriate parameters
1783 		 */
1784 		if (sig > ifmgd->rssi_max_thold &&
1785 		    (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
1786 			ifmgd->last_ave_beacon_signal = sig;
1787 			drv_rssi_callback(local, RSSI_EVENT_HIGH);
1788 		} else if (sig < ifmgd->rssi_min_thold &&
1789 			   (last_sig >= ifmgd->rssi_max_thold ||
1790 			   last_sig == 0)) {
1791 			ifmgd->last_ave_beacon_signal = sig;
1792 			drv_rssi_callback(local, RSSI_EVENT_LOW);
1793 		}
1794 	}
1795 
1796 	if (bss_conf->cqm_rssi_thold &&
1797 	    ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
1798 	    !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) {
1799 		int sig = ifmgd->ave_beacon_signal / 16;
1800 		int last_event = ifmgd->last_cqm_event_signal;
1801 		int thold = bss_conf->cqm_rssi_thold;
1802 		int hyst = bss_conf->cqm_rssi_hyst;
1803 		if (sig < thold &&
1804 		    (last_event == 0 || sig < last_event - hyst)) {
1805 			ifmgd->last_cqm_event_signal = sig;
1806 			ieee80211_cqm_rssi_notify(
1807 				&sdata->vif,
1808 				NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
1809 				GFP_KERNEL);
1810 		} else if (sig > thold &&
1811 			   (last_event == 0 || sig > last_event + hyst)) {
1812 			ifmgd->last_cqm_event_signal = sig;
1813 			ieee80211_cqm_rssi_notify(
1814 				&sdata->vif,
1815 				NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
1816 				GFP_KERNEL);
1817 		}
1818 	}
1819 
1820 	if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1821 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1822 		if (net_ratelimit()) {
1823 			printk(KERN_DEBUG "%s: cancelling probereq poll due "
1824 			       "to a received beacon\n", sdata->name);
1825 		}
1826 #endif
1827 		ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1828 		mutex_lock(&local->iflist_mtx);
1829 		ieee80211_recalc_ps(local, -1);
1830 		mutex_unlock(&local->iflist_mtx);
1831 	}
1832 
1833 	/*
1834 	 * Push the beacon loss detection into the future since
1835 	 * we are processing a beacon from the AP just now.
1836 	 */
1837 	ieee80211_sta_reset_beacon_monitor(sdata);
1838 
1839 	ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1840 	ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1841 					  len - baselen, &elems,
1842 					  care_about_ies, ncrc);
1843 
1844 	if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1845 		directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1846 						   ifmgd->aid);
1847 
1848 	if (ncrc != ifmgd->beacon_crc || !ifmgd->beacon_crc_valid) {
1849 		ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1850 				      true);
1851 
1852 		ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1853 					 elems.wmm_param_len);
1854 	}
1855 
1856 	if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1857 		if (directed_tim) {
1858 			if (local->hw.conf.dynamic_ps_timeout > 0) {
1859 				local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1860 				ieee80211_hw_config(local,
1861 						    IEEE80211_CONF_CHANGE_PS);
1862 				ieee80211_send_nullfunc(local, sdata, 0);
1863 			} else {
1864 				local->pspolling = true;
1865 
1866 				/*
1867 				 * Here is assumed that the driver will be
1868 				 * able to send ps-poll frame and receive a
1869 				 * response even though power save mode is
1870 				 * enabled, but some drivers might require
1871 				 * to disable power save here. This needs
1872 				 * to be investigated.
1873 				 */
1874 				ieee80211_send_pspoll(local, sdata);
1875 			}
1876 		}
1877 	}
1878 
1879 	if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
1880 		return;
1881 	ifmgd->beacon_crc = ncrc;
1882 	ifmgd->beacon_crc_valid = true;
1883 
1884 	if (elems.erp_info && elems.erp_info_len >= 1) {
1885 		erp_valid = true;
1886 		erp_value = elems.erp_info[0];
1887 	} else {
1888 		erp_valid = false;
1889 	}
1890 	changed |= ieee80211_handle_bss_capability(sdata,
1891 			le16_to_cpu(mgmt->u.beacon.capab_info),
1892 			erp_valid, erp_value);
1893 
1894 
1895 	if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1896 	    !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1897 		struct sta_info *sta;
1898 		struct ieee80211_supported_band *sband;
1899 		u16 ap_ht_cap_flags;
1900 
1901 		rcu_read_lock();
1902 
1903 		sta = sta_info_get(sdata, bssid);
1904 		if (WARN_ON(!sta)) {
1905 			rcu_read_unlock();
1906 			return;
1907 		}
1908 
1909 		sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1910 
1911 		ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1912 				elems.ht_cap_elem, &sta->sta.ht_cap);
1913 
1914 		ap_ht_cap_flags = sta->sta.ht_cap.cap;
1915 
1916 		rcu_read_unlock();
1917 
1918 		changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1919 					       bssid, ap_ht_cap_flags);
1920 	}
1921 
1922 	/* Note: country IE parsing is done for us by cfg80211 */
1923 	if (elems.country_elem) {
1924 		/* TODO: IBSS also needs this */
1925 		if (elems.pwr_constr_elem)
1926 			ieee80211_handle_pwr_constr(sdata,
1927 				le16_to_cpu(mgmt->u.probe_resp.capab_info),
1928 				elems.pwr_constr_elem,
1929 				elems.pwr_constr_elem_len);
1930 	}
1931 
1932 	ieee80211_bss_info_change_notify(sdata, changed);
1933 }
1934 
1935 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1936 				  struct sk_buff *skb)
1937 {
1938 	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1939 	struct ieee80211_rx_status *rx_status;
1940 	struct ieee80211_mgmt *mgmt;
1941 	enum rx_mgmt_action rma = RX_MGMT_NONE;
1942 	u16 fc;
1943 
1944 	rx_status = (struct ieee80211_rx_status *) skb->cb;
1945 	mgmt = (struct ieee80211_mgmt *) skb->data;
1946 	fc = le16_to_cpu(mgmt->frame_control);
1947 
1948 	mutex_lock(&ifmgd->mtx);
1949 
1950 	if (ifmgd->associated &&
1951 	    memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1952 		switch (fc & IEEE80211_FCTL_STYPE) {
1953 		case IEEE80211_STYPE_BEACON:
1954 			ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1955 						 rx_status);
1956 			break;
1957 		case IEEE80211_STYPE_PROBE_RESP:
1958 			ieee80211_rx_mgmt_probe_resp(sdata, skb);
1959 			break;
1960 		case IEEE80211_STYPE_DEAUTH:
1961 			rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1962 			break;
1963 		case IEEE80211_STYPE_DISASSOC:
1964 			rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1965 			break;
1966 		case IEEE80211_STYPE_ACTION:
1967 			switch (mgmt->u.action.category) {
1968 			case WLAN_CATEGORY_SPECTRUM_MGMT:
1969 				ieee80211_sta_process_chanswitch(sdata,
1970 						&mgmt->u.action.u.chan_switch.sw_elem,
1971 						(void *)ifmgd->associated->priv,
1972 						rx_status->mactime);
1973 				break;
1974 			}
1975 		}
1976 		mutex_unlock(&ifmgd->mtx);
1977 
1978 		switch (rma) {
1979 		case RX_MGMT_NONE:
1980 			/* no action */
1981 			break;
1982 		case RX_MGMT_CFG80211_DEAUTH:
1983 			cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1984 			break;
1985 		case RX_MGMT_CFG80211_DISASSOC:
1986 			cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1987 			break;
1988 		default:
1989 			WARN(1, "unexpected: %d", rma);
1990 		}
1991 		return;
1992 	}
1993 
1994 	mutex_unlock(&ifmgd->mtx);
1995 
1996 	if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1997 	    (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH) {
1998 		struct ieee80211_local *local = sdata->local;
1999 		struct ieee80211_work *wk;
2000 
2001 		mutex_lock(&local->mtx);
2002 		list_for_each_entry(wk, &local->work_list, list) {
2003 			if (wk->sdata != sdata)
2004 				continue;
2005 
2006 			if (wk->type != IEEE80211_WORK_ASSOC &&
2007 			    wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
2008 				continue;
2009 
2010 			if (memcmp(mgmt->bssid, wk->filter_ta, ETH_ALEN))
2011 				continue;
2012 			if (memcmp(mgmt->sa, wk->filter_ta, ETH_ALEN))
2013 				continue;
2014 
2015 			/*
2016 			 * Printing the message only here means we can't
2017 			 * spuriously print it, but it also means that it
2018 			 * won't be printed when the frame comes in before
2019 			 * we even tried to associate or in similar cases.
2020 			 *
2021 			 * Ultimately, I suspect cfg80211 should print the
2022 			 * messages instead.
2023 			 */
2024 			printk(KERN_DEBUG
2025 			       "%s: deauthenticated from %pM (Reason: %u)\n",
2026 			       sdata->name, mgmt->bssid,
2027 			       le16_to_cpu(mgmt->u.deauth.reason_code));
2028 
2029 			list_del_rcu(&wk->list);
2030 			free_work(wk);
2031 			break;
2032 		}
2033 		mutex_unlock(&local->mtx);
2034 
2035 		cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
2036 	}
2037 }
2038 
2039 static void ieee80211_sta_timer(unsigned long data)
2040 {
2041 	struct ieee80211_sub_if_data *sdata =
2042 		(struct ieee80211_sub_if_data *) data;
2043 	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2044 	struct ieee80211_local *local = sdata->local;
2045 
2046 	if (local->quiescing) {
2047 		set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2048 		return;
2049 	}
2050 
2051 	ieee80211_queue_work(&local->hw, &sdata->work);
2052 }
2053 
2054 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
2055 					  u8 *bssid, u8 reason)
2056 {
2057 	struct ieee80211_local *local = sdata->local;
2058 	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2059 
2060 	ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
2061 			  IEEE80211_STA_BEACON_POLL);
2062 
2063 	ieee80211_set_disassoc(sdata, true, true);
2064 	mutex_unlock(&ifmgd->mtx);
2065 	mutex_lock(&local->mtx);
2066 	ieee80211_recalc_idle(local);
2067 	mutex_unlock(&local->mtx);
2068 	/*
2069 	 * must be outside lock due to cfg80211,
2070 	 * but that's not a problem.
2071 	 */
2072 	ieee80211_send_deauth_disassoc(sdata, bssid,
2073 			IEEE80211_STYPE_DEAUTH, reason,
2074 			NULL, true);
2075 	mutex_lock(&ifmgd->mtx);
2076 }
2077 
2078 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
2079 {
2080 	struct ieee80211_local *local = sdata->local;
2081 	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2082 
2083 	/* then process the rest of the work */
2084 	mutex_lock(&ifmgd->mtx);
2085 
2086 	if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2087 			    IEEE80211_STA_CONNECTION_POLL) &&
2088 	    ifmgd->associated) {
2089 		u8 bssid[ETH_ALEN];
2090 		int max_tries;
2091 
2092 		memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
2093 
2094 		if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2095 			max_tries = max_nullfunc_tries;
2096 		else
2097 			max_tries = max_probe_tries;
2098 
2099 		/* ACK received for nullfunc probing frame */
2100 		if (!ifmgd->probe_send_count)
2101 			ieee80211_reset_ap_probe(sdata);
2102 		else if (ifmgd->nullfunc_failed) {
2103 			if (ifmgd->probe_send_count < max_tries) {
2104 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2105 				wiphy_debug(local->hw.wiphy,
2106 					    "%s: No ack for nullfunc frame to"
2107 					    " AP %pM, try %d/%i\n",
2108 					    sdata->name, bssid,
2109 					    ifmgd->probe_send_count, max_tries);
2110 #endif
2111 				ieee80211_mgd_probe_ap_send(sdata);
2112 			} else {
2113 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2114 				wiphy_debug(local->hw.wiphy,
2115 					    "%s: No ack for nullfunc frame to"
2116 					    " AP %pM, disconnecting.\n",
2117 					    sdata->name, bssid);
2118 #endif
2119 				ieee80211_sta_connection_lost(sdata, bssid,
2120 					WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2121 			}
2122 		} else if (time_is_after_jiffies(ifmgd->probe_timeout))
2123 			run_again(ifmgd, ifmgd->probe_timeout);
2124 		else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2125 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2126 			wiphy_debug(local->hw.wiphy,
2127 				    "%s: Failed to send nullfunc to AP %pM"
2128 				    " after %dms, disconnecting.\n",
2129 				    sdata->name,
2130 				    bssid, probe_wait_ms);
2131 #endif
2132 			ieee80211_sta_connection_lost(sdata, bssid,
2133 				WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2134 		} else if (ifmgd->probe_send_count < max_tries) {
2135 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2136 			wiphy_debug(local->hw.wiphy,
2137 				    "%s: No probe response from AP %pM"
2138 				    " after %dms, try %d/%i\n",
2139 				    sdata->name,
2140 				    bssid, probe_wait_ms,
2141 				    ifmgd->probe_send_count, max_tries);
2142 #endif
2143 			ieee80211_mgd_probe_ap_send(sdata);
2144 		} else {
2145 			/*
2146 			 * We actually lost the connection ... or did we?
2147 			 * Let's make sure!
2148 			 */
2149 			wiphy_debug(local->hw.wiphy,
2150 				    "%s: No probe response from AP %pM"
2151 				    " after %dms, disconnecting.\n",
2152 				    sdata->name,
2153 				    bssid, probe_wait_ms);
2154 
2155 			ieee80211_sta_connection_lost(sdata, bssid,
2156 				WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2157 		}
2158 	}
2159 
2160 	mutex_unlock(&ifmgd->mtx);
2161 }
2162 
2163 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
2164 {
2165 	struct ieee80211_sub_if_data *sdata =
2166 		(struct ieee80211_sub_if_data *) data;
2167 	struct ieee80211_local *local = sdata->local;
2168 
2169 	if (local->quiescing)
2170 		return;
2171 
2172 	ieee80211_queue_work(&sdata->local->hw,
2173 			     &sdata->u.mgd.beacon_connection_loss_work);
2174 }
2175 
2176 static void ieee80211_sta_conn_mon_timer(unsigned long data)
2177 {
2178 	struct ieee80211_sub_if_data *sdata =
2179 		(struct ieee80211_sub_if_data *) data;
2180 	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2181 	struct ieee80211_local *local = sdata->local;
2182 
2183 	if (local->quiescing)
2184 		return;
2185 
2186 	ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
2187 }
2188 
2189 static void ieee80211_sta_monitor_work(struct work_struct *work)
2190 {
2191 	struct ieee80211_sub_if_data *sdata =
2192 		container_of(work, struct ieee80211_sub_if_data,
2193 			     u.mgd.monitor_work);
2194 
2195 	ieee80211_mgd_probe_ap(sdata, false);
2196 }
2197 
2198 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2199 {
2200 	if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2201 		sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
2202 					IEEE80211_STA_CONNECTION_POLL);
2203 
2204 		/* let's probe the connection once */
2205 		ieee80211_queue_work(&sdata->local->hw,
2206 			   &sdata->u.mgd.monitor_work);
2207 		/* and do all the other regular work too */
2208 		ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2209 	}
2210 }
2211 
2212 #ifdef CONFIG_PM
2213 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2214 {
2215 	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2216 
2217 	/*
2218 	 * we need to use atomic bitops for the running bits
2219 	 * only because both timers might fire at the same
2220 	 * time -- the code here is properly synchronised.
2221 	 */
2222 
2223 	cancel_work_sync(&ifmgd->request_smps_work);
2224 
2225 	cancel_work_sync(&ifmgd->beacon_connection_loss_work);
2226 	if (del_timer_sync(&ifmgd->timer))
2227 		set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2228 
2229 	cancel_work_sync(&ifmgd->chswitch_work);
2230 	if (del_timer_sync(&ifmgd->chswitch_timer))
2231 		set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2232 
2233 	cancel_work_sync(&ifmgd->monitor_work);
2234 	/* these will just be re-established on connection */
2235 	del_timer_sync(&ifmgd->conn_mon_timer);
2236 	del_timer_sync(&ifmgd->bcn_mon_timer);
2237 }
2238 
2239 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2240 {
2241 	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2242 
2243 	if (!ifmgd->associated)
2244 		return;
2245 
2246 	if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
2247 		sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
2248 		mutex_lock(&ifmgd->mtx);
2249 		if (ifmgd->associated) {
2250 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2251 			wiphy_debug(sdata->local->hw.wiphy,
2252 				    "%s: driver requested disconnect after resume.\n",
2253 				    sdata->name);
2254 #endif
2255 			ieee80211_sta_connection_lost(sdata,
2256 				ifmgd->associated->bssid,
2257 				WLAN_REASON_UNSPECIFIED);
2258 			mutex_unlock(&ifmgd->mtx);
2259 			return;
2260 		}
2261 		mutex_unlock(&ifmgd->mtx);
2262 	}
2263 
2264 	if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2265 		add_timer(&ifmgd->timer);
2266 	if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2267 		add_timer(&ifmgd->chswitch_timer);
2268 	ieee80211_sta_reset_beacon_monitor(sdata);
2269 	ieee80211_restart_sta_timer(sdata);
2270 	ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.monitor_work);
2271 }
2272 #endif
2273 
2274 /* interface setup */
2275 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2276 {
2277 	struct ieee80211_if_managed *ifmgd;
2278 
2279 	ifmgd = &sdata->u.mgd;
2280 	INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
2281 	INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2282 	INIT_WORK(&ifmgd->beacon_connection_loss_work,
2283 		  ieee80211_beacon_connection_loss_work);
2284 	INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
2285 	setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2286 		    (unsigned long) sdata);
2287 	setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
2288 		    (unsigned long) sdata);
2289 	setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
2290 		    (unsigned long) sdata);
2291 	setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2292 		    (unsigned long) sdata);
2293 
2294 	ifmgd->flags = 0;
2295 
2296 	mutex_init(&ifmgd->mtx);
2297 
2298 	if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
2299 		ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
2300 	else
2301 		ifmgd->req_smps = IEEE80211_SMPS_OFF;
2302 }
2303 
2304 /* scan finished notification */
2305 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2306 {
2307 	struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2308 
2309 	/* Restart STA timers */
2310 	rcu_read_lock();
2311 	list_for_each_entry_rcu(sdata, &local->interfaces, list)
2312 		ieee80211_restart_sta_timer(sdata);
2313 	rcu_read_unlock();
2314 }
2315 
2316 int ieee80211_max_network_latency(struct notifier_block *nb,
2317 				  unsigned long data, void *dummy)
2318 {
2319 	s32 latency_usec = (s32) data;
2320 	struct ieee80211_local *local =
2321 		container_of(nb, struct ieee80211_local,
2322 			     network_latency_notifier);
2323 
2324 	mutex_lock(&local->iflist_mtx);
2325 	ieee80211_recalc_ps(local, latency_usec);
2326 	mutex_unlock(&local->iflist_mtx);
2327 
2328 	return 0;
2329 }
2330 
2331 /* config hooks */
2332 static enum work_done_result
2333 ieee80211_probe_auth_done(struct ieee80211_work *wk,
2334 			  struct sk_buff *skb)
2335 {
2336 	if (!skb) {
2337 		cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
2338 		return WORK_DONE_DESTROY;
2339 	}
2340 
2341 	if (wk->type == IEEE80211_WORK_AUTH) {
2342 		cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
2343 		return WORK_DONE_DESTROY;
2344 	}
2345 
2346 	mutex_lock(&wk->sdata->u.mgd.mtx);
2347 	ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
2348 	mutex_unlock(&wk->sdata->u.mgd.mtx);
2349 
2350 	wk->type = IEEE80211_WORK_AUTH;
2351 	wk->probe_auth.tries = 0;
2352 	return WORK_DONE_REQUEUE;
2353 }
2354 
2355 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
2356 		       struct cfg80211_auth_request *req)
2357 {
2358 	const u8 *ssid;
2359 	struct ieee80211_work *wk;
2360 	u16 auth_alg;
2361 
2362 	if (req->local_state_change)
2363 		return 0; /* no need to update mac80211 state */
2364 
2365 	switch (req->auth_type) {
2366 	case NL80211_AUTHTYPE_OPEN_SYSTEM:
2367 		auth_alg = WLAN_AUTH_OPEN;
2368 		break;
2369 	case NL80211_AUTHTYPE_SHARED_KEY:
2370 		if (IS_ERR(sdata->local->wep_tx_tfm))
2371 			return -EOPNOTSUPP;
2372 		auth_alg = WLAN_AUTH_SHARED_KEY;
2373 		break;
2374 	case NL80211_AUTHTYPE_FT:
2375 		auth_alg = WLAN_AUTH_FT;
2376 		break;
2377 	case NL80211_AUTHTYPE_NETWORK_EAP:
2378 		auth_alg = WLAN_AUTH_LEAP;
2379 		break;
2380 	default:
2381 		return -EOPNOTSUPP;
2382 	}
2383 
2384 	wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2385 	if (!wk)
2386 		return -ENOMEM;
2387 
2388 	memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2389 
2390 	if (req->ie && req->ie_len) {
2391 		memcpy(wk->ie, req->ie, req->ie_len);
2392 		wk->ie_len = req->ie_len;
2393 	}
2394 
2395 	if (req->key && req->key_len) {
2396 		wk->probe_auth.key_len = req->key_len;
2397 		wk->probe_auth.key_idx = req->key_idx;
2398 		memcpy(wk->probe_auth.key, req->key, req->key_len);
2399 	}
2400 
2401 	ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2402 	memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
2403 	wk->probe_auth.ssid_len = ssid[1];
2404 
2405 	wk->probe_auth.algorithm = auth_alg;
2406 	wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
2407 
2408 	/* if we already have a probe, don't probe again */
2409 	if (req->bss->proberesp_ies)
2410 		wk->type = IEEE80211_WORK_AUTH;
2411 	else
2412 		wk->type = IEEE80211_WORK_DIRECT_PROBE;
2413 	wk->chan = req->bss->channel;
2414 	wk->chan_type = NL80211_CHAN_NO_HT;
2415 	wk->sdata = sdata;
2416 	wk->done = ieee80211_probe_auth_done;
2417 
2418 	ieee80211_add_work(wk);
2419 	return 0;
2420 }
2421 
2422 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
2423 						  struct sk_buff *skb)
2424 {
2425 	struct ieee80211_mgmt *mgmt;
2426 	struct ieee80211_rx_status *rx_status;
2427 	struct ieee802_11_elems elems;
2428 	u16 status;
2429 
2430 	if (!skb) {
2431 		cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
2432 		return WORK_DONE_DESTROY;
2433 	}
2434 
2435 	if (wk->type == IEEE80211_WORK_ASSOC_BEACON_WAIT) {
2436 		mutex_lock(&wk->sdata->u.mgd.mtx);
2437 		rx_status = (void *) skb->cb;
2438 		ieee802_11_parse_elems(skb->data + 24 + 12, skb->len - 24 - 12, &elems);
2439 		ieee80211_rx_bss_info(wk->sdata, (void *)skb->data, skb->len, rx_status,
2440 				      &elems, true);
2441 		mutex_unlock(&wk->sdata->u.mgd.mtx);
2442 
2443 		wk->type = IEEE80211_WORK_ASSOC;
2444 		/* not really done yet */
2445 		return WORK_DONE_REQUEUE;
2446 	}
2447 
2448 	mgmt = (void *)skb->data;
2449 	status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2450 
2451 	if (status == WLAN_STATUS_SUCCESS) {
2452 		mutex_lock(&wk->sdata->u.mgd.mtx);
2453 		if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
2454 			mutex_unlock(&wk->sdata->u.mgd.mtx);
2455 			/* oops -- internal error -- send timeout for now */
2456 			cfg80211_send_assoc_timeout(wk->sdata->dev,
2457 						    wk->filter_ta);
2458 			return WORK_DONE_DESTROY;
2459 		}
2460 
2461 		mutex_unlock(&wk->sdata->u.mgd.mtx);
2462 	}
2463 
2464 	cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
2465 	return WORK_DONE_DESTROY;
2466 }
2467 
2468 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2469 			struct cfg80211_assoc_request *req)
2470 {
2471 	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2472 	struct ieee80211_bss *bss = (void *)req->bss->priv;
2473 	struct ieee80211_work *wk;
2474 	const u8 *ssid;
2475 	int i;
2476 
2477 	mutex_lock(&ifmgd->mtx);
2478 	if (ifmgd->associated) {
2479 		if (!req->prev_bssid ||
2480 		    memcmp(req->prev_bssid, ifmgd->associated->bssid,
2481 			   ETH_ALEN)) {
2482 			/*
2483 			 * We are already associated and the request was not a
2484 			 * reassociation request from the current BSS, so
2485 			 * reject it.
2486 			 */
2487 			mutex_unlock(&ifmgd->mtx);
2488 			return -EALREADY;
2489 		}
2490 
2491 		/* Trying to reassociate - clear previous association state */
2492 		ieee80211_set_disassoc(sdata, true, false);
2493 	}
2494 	mutex_unlock(&ifmgd->mtx);
2495 
2496 	wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2497 	if (!wk)
2498 		return -ENOMEM;
2499 
2500 	ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2501 	ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
2502 
2503 	ifmgd->beacon_crc_valid = false;
2504 
2505 	for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2506 		if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2507 		    req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2508 		    req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2509 			ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2510 
2511 
2512 	if (req->ie && req->ie_len) {
2513 		memcpy(wk->ie, req->ie, req->ie_len);
2514 		wk->ie_len = req->ie_len;
2515 	} else
2516 		wk->ie_len = 0;
2517 
2518 	wk->assoc.bss = req->bss;
2519 
2520 	memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2521 
2522 	/* new association always uses requested smps mode */
2523 	if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
2524 		if (ifmgd->powersave)
2525 			ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
2526 		else
2527 			ifmgd->ap_smps = IEEE80211_SMPS_OFF;
2528 	} else
2529 		ifmgd->ap_smps = ifmgd->req_smps;
2530 
2531 	wk->assoc.smps = ifmgd->ap_smps;
2532 	/*
2533 	 * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
2534 	 * We still associate in non-HT mode (11a/b/g) if any one of these
2535 	 * ciphers is configured as pairwise.
2536 	 * We can set this to true for non-11n hardware, that'll be checked
2537 	 * separately along with the peer capabilities.
2538 	 */
2539 	wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
2540 	wk->assoc.capability = req->bss->capability;
2541 	wk->assoc.wmm_used = bss->wmm_used;
2542 	wk->assoc.supp_rates = bss->supp_rates;
2543 	wk->assoc.supp_rates_len = bss->supp_rates_len;
2544 	wk->assoc.ht_information_ie =
2545 		ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
2546 
2547 	if (bss->wmm_used && bss->uapsd_supported &&
2548 	    (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
2549 		wk->assoc.uapsd_used = true;
2550 		ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
2551 	} else {
2552 		wk->assoc.uapsd_used = false;
2553 		ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
2554 	}
2555 
2556 	ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2557 	memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
2558 	wk->assoc.ssid_len = ssid[1];
2559 
2560 	if (req->prev_bssid)
2561 		memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
2562 
2563 	wk->chan = req->bss->channel;
2564 	wk->chan_type = NL80211_CHAN_NO_HT;
2565 	wk->sdata = sdata;
2566 	wk->done = ieee80211_assoc_done;
2567 	if (!bss->dtim_period &&
2568 	    sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
2569 		wk->type = IEEE80211_WORK_ASSOC_BEACON_WAIT;
2570 	else
2571 		wk->type = IEEE80211_WORK_ASSOC;
2572 
2573 	if (req->use_mfp) {
2574 		ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2575 		ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2576 	} else {
2577 		ifmgd->mfp = IEEE80211_MFP_DISABLED;
2578 		ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2579 	}
2580 
2581 	if (req->crypto.control_port)
2582 		ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2583 	else
2584 		ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2585 
2586 	sdata->control_port_protocol = req->crypto.control_port_ethertype;
2587 	sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
2588 
2589 	ieee80211_add_work(wk);
2590 	return 0;
2591 }
2592 
2593 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2594 			 struct cfg80211_deauth_request *req,
2595 			 void *cookie)
2596 {
2597 	struct ieee80211_local *local = sdata->local;
2598 	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2599 	struct ieee80211_work *wk;
2600 	u8 bssid[ETH_ALEN];
2601 	bool assoc_bss = false;
2602 
2603 	mutex_lock(&ifmgd->mtx);
2604 
2605 	memcpy(bssid, req->bss->bssid, ETH_ALEN);
2606 	if (ifmgd->associated == req->bss) {
2607 		ieee80211_set_disassoc(sdata, false, true);
2608 		mutex_unlock(&ifmgd->mtx);
2609 		assoc_bss = true;
2610 	} else {
2611 		bool not_auth_yet = false;
2612 
2613 		mutex_unlock(&ifmgd->mtx);
2614 
2615 		mutex_lock(&local->mtx);
2616 		list_for_each_entry(wk, &local->work_list, list) {
2617 			if (wk->sdata != sdata)
2618 				continue;
2619 
2620 			if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2621 			    wk->type != IEEE80211_WORK_AUTH &&
2622 			    wk->type != IEEE80211_WORK_ASSOC &&
2623 			    wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
2624 				continue;
2625 
2626 			if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2627 				continue;
2628 
2629 			not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2630 			list_del_rcu(&wk->list);
2631 			free_work(wk);
2632 			break;
2633 		}
2634 		mutex_unlock(&local->mtx);
2635 
2636 		/*
2637 		 * If somebody requests authentication and we haven't
2638 		 * sent out an auth frame yet there's no need to send
2639 		 * out a deauth frame either. If the state was PROBE,
2640 		 * then this is the case. If it's AUTH we have sent a
2641 		 * frame, and if it's IDLE we have completed the auth
2642 		 * process already.
2643 		 */
2644 		if (not_auth_yet) {
2645 			__cfg80211_auth_canceled(sdata->dev, bssid);
2646 			return 0;
2647 		}
2648 	}
2649 
2650 	printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2651 	       sdata->name, bssid, req->reason_code);
2652 
2653 	ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH,
2654 				       req->reason_code, cookie,
2655 				       !req->local_state_change);
2656 	if (assoc_bss)
2657 		sta_info_destroy_addr(sdata, bssid);
2658 
2659 	mutex_lock(&sdata->local->mtx);
2660 	ieee80211_recalc_idle(sdata->local);
2661 	mutex_unlock(&sdata->local->mtx);
2662 
2663 	return 0;
2664 }
2665 
2666 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2667 			   struct cfg80211_disassoc_request *req,
2668 			   void *cookie)
2669 {
2670 	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2671 	u8 bssid[ETH_ALEN];
2672 
2673 	mutex_lock(&ifmgd->mtx);
2674 
2675 	/*
2676 	 * cfg80211 should catch this ... but it's racy since
2677 	 * we can receive a disassoc frame, process it, hand it
2678 	 * to cfg80211 while that's in a locked section already
2679 	 * trying to tell us that the user wants to disconnect.
2680 	 */
2681 	if (ifmgd->associated != req->bss) {
2682 		mutex_unlock(&ifmgd->mtx);
2683 		return -ENOLINK;
2684 	}
2685 
2686 	printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2687 	       sdata->name, req->bss->bssid, req->reason_code);
2688 
2689 	memcpy(bssid, req->bss->bssid, ETH_ALEN);
2690 	ieee80211_set_disassoc(sdata, false, true);
2691 
2692 	mutex_unlock(&ifmgd->mtx);
2693 
2694 	ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2695 			IEEE80211_STYPE_DISASSOC, req->reason_code,
2696 			cookie, !req->local_state_change);
2697 	sta_info_destroy_addr(sdata, bssid);
2698 
2699 	mutex_lock(&sdata->local->mtx);
2700 	ieee80211_recalc_idle(sdata->local);
2701 	mutex_unlock(&sdata->local->mtx);
2702 
2703 	return 0;
2704 }
2705 
2706 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
2707 			       enum nl80211_cqm_rssi_threshold_event rssi_event,
2708 			       gfp_t gfp)
2709 {
2710 	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2711 
2712 	trace_api_cqm_rssi_notify(sdata, rssi_event);
2713 
2714 	cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
2715 }
2716 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
2717 
2718 unsigned char ieee80211_get_operstate(struct ieee80211_vif *vif)
2719 {
2720 	struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2721 	return sdata->dev->operstate;
2722 }
2723 EXPORT_SYMBOL(ieee80211_get_operstate);
2724