mac80211: quiesce vif before suspending
[linux-2.6.git] / net / mac80211 / mlme.c
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 = &sdata->u.mgd;
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         if (local->hw.conf.flags & IEEE80211_CONF_PS)
761                 return;
762
763         /*
764          * transmission can be stopped by others which leads to
765          * dynamic_ps_timer expiry. Postpond the ps timer if it
766          * is not the actual idle state.
767          */
768         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
769         for (q = 0; q < local->hw.queues; q++) {
770                 if (local->queue_stop_reasons[q]) {
771                         spin_unlock_irqrestore(&local->queue_stop_reason_lock,
772                                                flags);
773                         mod_timer(&local->dynamic_ps_timer, jiffies +
774                                   msecs_to_jiffies(
775                                   local->hw.conf.dynamic_ps_timeout));
776                         return;
777                 }
778         }
779         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
780
781         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
782             (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED))) {
783                 netif_tx_stop_all_queues(sdata->dev);
784
785                 if (drv_tx_frames_pending(local))
786                         mod_timer(&local->dynamic_ps_timer, jiffies +
787                                   msecs_to_jiffies(
788                                   local->hw.conf.dynamic_ps_timeout));
789                 else {
790                         ieee80211_send_nullfunc(local, sdata, 1);
791                         /* Flush to get the tx status of nullfunc frame */
792                         drv_flush(local, false);
793                 }
794         }
795
796         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
797               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
798             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
799                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
800                 local->hw.conf.flags |= IEEE80211_CONF_PS;
801                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
802         }
803
804         netif_tx_wake_all_queues(sdata->dev);
805 }
806
807 void ieee80211_dynamic_ps_timer(unsigned long data)
808 {
809         struct ieee80211_local *local = (void *) data;
810
811         if (local->quiescing || local->suspended)
812                 return;
813
814         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
815 }
816
817 /* MLME */
818 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
819                                      struct ieee80211_sub_if_data *sdata,
820                                      u8 *wmm_param, size_t wmm_param_len)
821 {
822         struct ieee80211_tx_queue_params params;
823         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
824         size_t left;
825         int count;
826         u8 *pos, uapsd_queues = 0;
827
828         if (!local->ops->conf_tx)
829                 return;
830
831         if (local->hw.queues < 4)
832                 return;
833
834         if (!wmm_param)
835                 return;
836
837         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
838                 return;
839
840         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
841                 uapsd_queues = local->uapsd_queues;
842
843         count = wmm_param[6] & 0x0f;
844         if (count == ifmgd->wmm_last_param_set)
845                 return;
846         ifmgd->wmm_last_param_set = count;
847
848         pos = wmm_param + 8;
849         left = wmm_param_len - 8;
850
851         memset(&params, 0, sizeof(params));
852
853         local->wmm_acm = 0;
854         for (; left >= 4; left -= 4, pos += 4) {
855                 int aci = (pos[0] >> 5) & 0x03;
856                 int acm = (pos[0] >> 4) & 0x01;
857                 bool uapsd = false;
858                 int queue;
859
860                 switch (aci) {
861                 case 1: /* AC_BK */
862                         queue = 3;
863                         if (acm)
864                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
865                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
866                                 uapsd = true;
867                         break;
868                 case 2: /* AC_VI */
869                         queue = 1;
870                         if (acm)
871                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
872                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
873                                 uapsd = true;
874                         break;
875                 case 3: /* AC_VO */
876                         queue = 0;
877                         if (acm)
878                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
879                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
880                                 uapsd = true;
881                         break;
882                 case 0: /* AC_BE */
883                 default:
884                         queue = 2;
885                         if (acm)
886                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
887                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
888                                 uapsd = true;
889                         break;
890                 }
891
892                 params.aifs = pos[0] & 0x0f;
893                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
894                 params.cw_min = ecw2cw(pos[1] & 0x0f);
895                 params.txop = get_unaligned_le16(pos + 2);
896                 params.uapsd = uapsd;
897
898 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
899                 wiphy_debug(local->hw.wiphy,
900                             "WMM queue=%d aci=%d acm=%d aifs=%d "
901                             "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
902                             queue, aci, acm,
903                             params.aifs, params.cw_min, params.cw_max,
904                             params.txop, params.uapsd);
905 #endif
906                 if (drv_conf_tx(local, queue, &params))
907                         wiphy_debug(local->hw.wiphy,
908                                     "failed to set TX queue parameters for queue %d\n",
909                                     queue);
910         }
911
912         /* enable WMM or activate new settings */
913         sdata->vif.bss_conf.qos = true;
914         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
915 }
916
917 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
918                                            u16 capab, bool erp_valid, u8 erp)
919 {
920         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
921         u32 changed = 0;
922         bool use_protection;
923         bool use_short_preamble;
924         bool use_short_slot;
925
926         if (erp_valid) {
927                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
928                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
929         } else {
930                 use_protection = false;
931                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
932         }
933
934         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
935         if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
936                 use_short_slot = true;
937
938         if (use_protection != bss_conf->use_cts_prot) {
939                 bss_conf->use_cts_prot = use_protection;
940                 changed |= BSS_CHANGED_ERP_CTS_PROT;
941         }
942
943         if (use_short_preamble != bss_conf->use_short_preamble) {
944                 bss_conf->use_short_preamble = use_short_preamble;
945                 changed |= BSS_CHANGED_ERP_PREAMBLE;
946         }
947
948         if (use_short_slot != bss_conf->use_short_slot) {
949                 bss_conf->use_short_slot = use_short_slot;
950                 changed |= BSS_CHANGED_ERP_SLOT;
951         }
952
953         return changed;
954 }
955
956 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
957                                      struct cfg80211_bss *cbss,
958                                      u32 bss_info_changed)
959 {
960         struct ieee80211_bss *bss = (void *)cbss->priv;
961         struct ieee80211_local *local = sdata->local;
962         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
963
964         bss_info_changed |= BSS_CHANGED_ASSOC;
965         /* set timing information */
966         bss_conf->beacon_int = cbss->beacon_interval;
967         bss_conf->timestamp = cbss->tsf;
968
969         bss_info_changed |= BSS_CHANGED_BEACON_INT;
970         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
971                 cbss->capability, bss->has_erp_value, bss->erp_value);
972
973         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
974                 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int));
975
976         sdata->u.mgd.associated = cbss;
977         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
978
979         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
980
981         /* just to be sure */
982         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
983                                 IEEE80211_STA_BEACON_POLL);
984
985         ieee80211_led_assoc(local, 1);
986
987         if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
988                 bss_conf->dtim_period = bss->dtim_period;
989         else
990                 bss_conf->dtim_period = 0;
991
992         bss_conf->assoc = 1;
993         /*
994          * For now just always ask the driver to update the basic rateset
995          * when we have associated, we aren't checking whether it actually
996          * changed or not.
997          */
998         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
999
1000         /* And the BSSID changed - we're associated now */
1001         bss_info_changed |= BSS_CHANGED_BSSID;
1002
1003         /* Tell the driver to monitor connection quality (if supported) */
1004         if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) &&
1005             bss_conf->cqm_rssi_thold)
1006                 bss_info_changed |= BSS_CHANGED_CQM;
1007
1008         /* Enable ARP filtering */
1009         if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
1010                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
1011                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1012         }
1013
1014         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1015
1016         mutex_lock(&local->iflist_mtx);
1017         ieee80211_recalc_ps(local, -1);
1018         ieee80211_recalc_smps(local);
1019         mutex_unlock(&local->iflist_mtx);
1020
1021         netif_tx_start_all_queues(sdata->dev);
1022         netif_carrier_on(sdata->dev);
1023 }
1024
1025 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1026                                    bool remove_sta, bool tx)
1027 {
1028         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1029         struct ieee80211_local *local = sdata->local;
1030         struct sta_info *sta;
1031         u32 changed = 0, config_changed = 0;
1032         u8 bssid[ETH_ALEN];
1033
1034         ASSERT_MGD_MTX(ifmgd);
1035
1036         if (WARN_ON(!ifmgd->associated))
1037                 return;
1038
1039         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1040
1041         ifmgd->associated = NULL;
1042         memset(ifmgd->bssid, 0, ETH_ALEN);
1043
1044         /*
1045          * we need to commit the associated = NULL change because the
1046          * scan code uses that to determine whether this iface should
1047          * go to/wake up from powersave or not -- and could otherwise
1048          * wake the queues erroneously.
1049          */
1050         smp_mb();
1051
1052         /*
1053          * Thus, we can only afterwards stop the queues -- to account
1054          * for the case where another CPU is finishing a scan at this
1055          * time -- we don't want the scan code to enable queues.
1056          */
1057
1058         netif_tx_stop_all_queues(sdata->dev);
1059         netif_carrier_off(sdata->dev);
1060
1061         mutex_lock(&local->sta_mtx);
1062         sta = sta_info_get(sdata, bssid);
1063         if (sta) {
1064                 set_sta_flags(sta, WLAN_STA_BLOCK_BA);
1065                 ieee80211_sta_tear_down_BA_sessions(sta, tx);
1066         }
1067         mutex_unlock(&local->sta_mtx);
1068
1069         changed |= ieee80211_reset_erp_info(sdata);
1070
1071         ieee80211_led_assoc(local, 0);
1072         changed |= BSS_CHANGED_ASSOC;
1073         sdata->vif.bss_conf.assoc = false;
1074
1075         ieee80211_set_wmm_default(sdata);
1076
1077         /* channel(_type) changes are handled by ieee80211_hw_config */
1078         WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
1079
1080         /* on the next assoc, re-program HT parameters */
1081         sdata->ht_opmode_valid = false;
1082
1083         local->power_constr_level = 0;
1084
1085         del_timer_sync(&local->dynamic_ps_timer);
1086         cancel_work_sync(&local->dynamic_ps_enable_work);
1087
1088         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1089                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1090                 config_changed |= IEEE80211_CONF_CHANGE_PS;
1091         }
1092         local->ps_sdata = NULL;
1093
1094         ieee80211_hw_config(local, config_changed);
1095
1096         /* Disable ARP filtering */
1097         if (sdata->vif.bss_conf.arp_filter_enabled) {
1098                 sdata->vif.bss_conf.arp_filter_enabled = false;
1099                 changed |= BSS_CHANGED_ARP_FILTER;
1100         }
1101
1102         /* The BSSID (not really interesting) and HT changed */
1103         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1104         ieee80211_bss_info_change_notify(sdata, changed);
1105
1106         if (remove_sta)
1107                 sta_info_destroy_addr(sdata, bssid);
1108
1109         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1110         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1111         del_timer_sync(&sdata->u.mgd.timer);
1112         del_timer_sync(&sdata->u.mgd.chswitch_timer);
1113 }
1114
1115 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1116                              struct ieee80211_hdr *hdr)
1117 {
1118         /*
1119          * We can postpone the mgd.timer whenever receiving unicast frames
1120          * from AP because we know that the connection is working both ways
1121          * at that time. But multicast frames (and hence also beacons) must
1122          * be ignored here, because we need to trigger the timer during
1123          * data idle periods for sending the periodic probe request to the
1124          * AP we're connected to.
1125          */
1126         if (is_multicast_ether_addr(hdr->addr1))
1127                 return;
1128
1129         ieee80211_sta_reset_conn_monitor(sdata);
1130 }
1131
1132 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1133 {
1134         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1135
1136         if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1137                               IEEE80211_STA_CONNECTION_POLL)))
1138             return;
1139
1140         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1141                           IEEE80211_STA_BEACON_POLL);
1142         mutex_lock(&sdata->local->iflist_mtx);
1143         ieee80211_recalc_ps(sdata->local, -1);
1144         mutex_unlock(&sdata->local->iflist_mtx);
1145
1146         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1147                 return;
1148
1149         /*
1150          * We've received a probe response, but are not sure whether
1151          * we have or will be receiving any beacons or data, so let's
1152          * schedule the timers again, just in case.
1153          */
1154         ieee80211_sta_reset_beacon_monitor(sdata);
1155
1156         mod_timer(&ifmgd->conn_mon_timer,
1157                   round_jiffies_up(jiffies +
1158                                    IEEE80211_CONNECTION_IDLE_TIME));
1159 }
1160
1161 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1162                              struct ieee80211_hdr *hdr, bool ack)
1163 {
1164         if (!ieee80211_is_data(hdr->frame_control))
1165             return;
1166
1167         if (ack)
1168                 ieee80211_sta_reset_conn_monitor(sdata);
1169
1170         if (ieee80211_is_nullfunc(hdr->frame_control) &&
1171             sdata->u.mgd.probe_send_count > 0) {
1172                 if (ack)
1173                         sdata->u.mgd.probe_send_count = 0;
1174                 else
1175                         sdata->u.mgd.nullfunc_failed = true;
1176                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1177         }
1178 }
1179
1180 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1181 {
1182         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1183         const u8 *ssid;
1184         u8 *dst = ifmgd->associated->bssid;
1185         u8 unicast_limit = max(1, max_probe_tries - 3);
1186
1187         /*
1188          * Try sending broadcast probe requests for the last three
1189          * probe requests after the first ones failed since some
1190          * buggy APs only support broadcast probe requests.
1191          */
1192         if (ifmgd->probe_send_count >= unicast_limit)
1193                 dst = NULL;
1194
1195         /*
1196          * When the hardware reports an accurate Tx ACK status, it's
1197          * better to send a nullfunc frame instead of a probe request,
1198          * as it will kick us off the AP quickly if we aren't associated
1199          * anymore. The timeout will be reset if the frame is ACKed by
1200          * the AP.
1201          */
1202         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1203                 ifmgd->nullfunc_failed = false;
1204                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1205         } else {
1206                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1207                 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid[1], NULL, 0);
1208         }
1209
1210         ifmgd->probe_send_count++;
1211         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1212         run_again(ifmgd, ifmgd->probe_timeout);
1213 }
1214
1215 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1216                                    bool beacon)
1217 {
1218         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1219         bool already = false;
1220
1221         if (!ieee80211_sdata_running(sdata))
1222                 return;
1223
1224         if (sdata->local->scanning)
1225                 return;
1226
1227         if (sdata->local->tmp_channel)
1228                 return;
1229
1230         mutex_lock(&ifmgd->mtx);
1231
1232         if (!ifmgd->associated)
1233                 goto out;
1234
1235 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1236         if (beacon && net_ratelimit())
1237                 printk(KERN_DEBUG "%s: detected beacon loss from AP "
1238                        "- sending probe request\n", sdata->name);
1239 #endif
1240
1241         /*
1242          * The driver/our work has already reported this event or the
1243          * connection monitoring has kicked in and we have already sent
1244          * a probe request. Or maybe the AP died and the driver keeps
1245          * reporting until we disassociate...
1246          *
1247          * In either case we have to ignore the current call to this
1248          * function (except for setting the correct probe reason bit)
1249          * because otherwise we would reset the timer every time and
1250          * never check whether we received a probe response!
1251          */
1252         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1253                             IEEE80211_STA_CONNECTION_POLL))
1254                 already = true;
1255
1256         if (beacon)
1257                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1258         else
1259                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1260
1261         if (already)
1262                 goto out;
1263
1264         mutex_lock(&sdata->local->iflist_mtx);
1265         ieee80211_recalc_ps(sdata->local, -1);
1266         mutex_unlock(&sdata->local->iflist_mtx);
1267
1268         ifmgd->probe_send_count = 0;
1269         ieee80211_mgd_probe_ap_send(sdata);
1270  out:
1271         mutex_unlock(&ifmgd->mtx);
1272 }
1273
1274 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
1275                                           struct ieee80211_vif *vif)
1276 {
1277         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1278         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1279         struct sk_buff *skb;
1280         const u8 *ssid;
1281
1282         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1283                 return NULL;
1284
1285         ASSERT_MGD_MTX(ifmgd);
1286
1287         if (!ifmgd->associated)
1288                 return NULL;
1289
1290         ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1291         skb = ieee80211_build_probe_req(sdata, ifmgd->associated->bssid,
1292                                         ssid + 2, ssid[1], NULL, 0);
1293
1294         return skb;
1295 }
1296 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
1297
1298 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
1299 {
1300         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1301         struct ieee80211_local *local = sdata->local;
1302         u8 bssid[ETH_ALEN];
1303
1304         mutex_lock(&ifmgd->mtx);
1305         if (!ifmgd->associated) {
1306                 mutex_unlock(&ifmgd->mtx);
1307                 return;
1308         }
1309
1310         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1311
1312         printk(KERN_DEBUG "%s: Connection to AP %pM lost.\n",
1313                sdata->name, bssid);
1314
1315         ieee80211_set_disassoc(sdata, true, true);
1316         mutex_unlock(&ifmgd->mtx);
1317
1318         mutex_lock(&local->mtx);
1319         ieee80211_recalc_idle(local);
1320         mutex_unlock(&local->mtx);
1321         /*
1322          * must be outside lock due to cfg80211,
1323          * but that's not a problem.
1324          */
1325         ieee80211_send_deauth_disassoc(sdata, bssid,
1326                                        IEEE80211_STYPE_DEAUTH,
1327                                        WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1328                                        NULL, true);
1329 }
1330
1331 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1332 {
1333         struct ieee80211_sub_if_data *sdata =
1334                 container_of(work, struct ieee80211_sub_if_data,
1335                              u.mgd.beacon_connection_loss_work);
1336
1337         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1338                 __ieee80211_connection_loss(sdata);
1339         else
1340                 ieee80211_mgd_probe_ap(sdata, true);
1341 }
1342
1343 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1344 {
1345         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1346         struct ieee80211_hw *hw = &sdata->local->hw;
1347
1348         trace_api_beacon_loss(sdata);
1349
1350         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1351         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1352 }
1353 EXPORT_SYMBOL(ieee80211_beacon_loss);
1354
1355 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1356 {
1357         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1358         struct ieee80211_hw *hw = &sdata->local->hw;
1359
1360         trace_api_connection_loss(sdata);
1361
1362         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1363         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1364 }
1365 EXPORT_SYMBOL(ieee80211_connection_loss);
1366
1367
1368 static enum rx_mgmt_action __must_check
1369 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1370                          struct ieee80211_mgmt *mgmt, size_t len)
1371 {
1372         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1373         const u8 *bssid = NULL;
1374         u16 reason_code;
1375
1376         if (len < 24 + 2)
1377                 return RX_MGMT_NONE;
1378
1379         ASSERT_MGD_MTX(ifmgd);
1380
1381         bssid = ifmgd->associated->bssid;
1382
1383         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1384
1385         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1386                         sdata->name, bssid, reason_code);
1387
1388         ieee80211_set_disassoc(sdata, true, false);
1389         mutex_lock(&sdata->local->mtx);
1390         ieee80211_recalc_idle(sdata->local);
1391         mutex_unlock(&sdata->local->mtx);
1392
1393         return RX_MGMT_CFG80211_DEAUTH;
1394 }
1395
1396
1397 static enum rx_mgmt_action __must_check
1398 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1399                            struct ieee80211_mgmt *mgmt, size_t len)
1400 {
1401         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1402         u16 reason_code;
1403
1404         if (len < 24 + 2)
1405                 return RX_MGMT_NONE;
1406
1407         ASSERT_MGD_MTX(ifmgd);
1408
1409         if (WARN_ON(!ifmgd->associated))
1410                 return RX_MGMT_NONE;
1411
1412         if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
1413                 return RX_MGMT_NONE;
1414
1415         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1416
1417         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1418                         sdata->name, mgmt->sa, reason_code);
1419
1420         ieee80211_set_disassoc(sdata, true, false);
1421         mutex_lock(&sdata->local->mtx);
1422         ieee80211_recalc_idle(sdata->local);
1423         mutex_unlock(&sdata->local->mtx);
1424         return RX_MGMT_CFG80211_DISASSOC;
1425 }
1426
1427
1428 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1429                                     struct ieee80211_mgmt *mgmt, size_t len)
1430 {
1431         struct ieee80211_sub_if_data *sdata = wk->sdata;
1432         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1433         struct ieee80211_local *local = sdata->local;
1434         struct ieee80211_supported_band *sband;
1435         struct sta_info *sta;
1436         struct cfg80211_bss *cbss = wk->assoc.bss;
1437         u8 *pos;
1438         u32 rates, basic_rates;
1439         u16 capab_info, aid;
1440         struct ieee802_11_elems elems;
1441         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1442         u32 changed = 0;
1443         int i, j, err;
1444         bool have_higher_than_11mbit = false;
1445         u16 ap_ht_cap_flags;
1446
1447         /* AssocResp and ReassocResp have identical structure */
1448
1449         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1450         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1451
1452         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1453                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1454                        "set\n", sdata->name, aid);
1455         aid &= ~(BIT(15) | BIT(14));
1456
1457         pos = mgmt->u.assoc_resp.variable;
1458         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1459
1460         if (!elems.supp_rates) {
1461                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1462                        sdata->name);
1463                 return false;
1464         }
1465
1466         ifmgd->aid = aid;
1467
1468         sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1469         if (!sta) {
1470                 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1471                        " the AP\n", sdata->name);
1472                 return false;
1473         }
1474
1475         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1476                            WLAN_STA_ASSOC_AP);
1477         if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1478                 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1479
1480         rates = 0;
1481         basic_rates = 0;
1482         sband = local->hw.wiphy->bands[wk->chan->band];
1483
1484         for (i = 0; i < elems.supp_rates_len; i++) {
1485                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1486                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1487
1488                 if (rate > 110)
1489                         have_higher_than_11mbit = true;
1490
1491                 for (j = 0; j < sband->n_bitrates; j++) {
1492                         if (sband->bitrates[j].bitrate == rate) {
1493                                 rates |= BIT(j);
1494                                 if (is_basic)
1495                                         basic_rates |= BIT(j);
1496                                 break;
1497                         }
1498                 }
1499         }
1500
1501         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1502                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1503                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1504
1505                 if (rate > 110)
1506                         have_higher_than_11mbit = true;
1507
1508                 for (j = 0; j < sband->n_bitrates; j++) {
1509                         if (sband->bitrates[j].bitrate == rate) {
1510                                 rates |= BIT(j);
1511                                 if (is_basic)
1512                                         basic_rates |= BIT(j);
1513                                 break;
1514                         }
1515                 }
1516         }
1517
1518         sta->sta.supp_rates[wk->chan->band] = rates;
1519         sdata->vif.bss_conf.basic_rates = basic_rates;
1520
1521         /* cf. IEEE 802.11 9.2.12 */
1522         if (wk->chan->band == IEEE80211_BAND_2GHZ &&
1523             have_higher_than_11mbit)
1524                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1525         else
1526                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1527
1528         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1529                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1530                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1531
1532         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1533
1534         rate_control_rate_init(sta);
1535
1536         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1537                 set_sta_flags(sta, WLAN_STA_MFP);
1538
1539         if (elems.wmm_param)
1540                 set_sta_flags(sta, WLAN_STA_WME);
1541
1542         err = sta_info_insert(sta);
1543         sta = NULL;
1544         if (err) {
1545                 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1546                        " the AP (error %d)\n", sdata->name, err);
1547                 return false;
1548         }
1549
1550         /*
1551          * Always handle WMM once after association regardless
1552          * of the first value the AP uses. Setting -1 here has
1553          * that effect because the AP values is an unsigned
1554          * 4-bit value.
1555          */
1556         ifmgd->wmm_last_param_set = -1;
1557
1558         if (elems.wmm_param)
1559                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1560                                          elems.wmm_param_len);
1561         else
1562                 ieee80211_set_wmm_default(sdata);
1563
1564         local->oper_channel = wk->chan;
1565
1566         if (elems.ht_info_elem && elems.wmm_param &&
1567             (sdata->local->hw.queues >= 4) &&
1568             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1569                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1570                                                cbss->bssid, ap_ht_cap_flags);
1571
1572         /* set AID and assoc capability,
1573          * ieee80211_set_associated() will tell the driver */
1574         bss_conf->aid = aid;
1575         bss_conf->assoc_capability = capab_info;
1576         ieee80211_set_associated(sdata, cbss, changed);
1577
1578         /*
1579          * If we're using 4-addr mode, let the AP know that we're
1580          * doing so, so that it can create the STA VLAN on its side
1581          */
1582         if (ifmgd->use_4addr)
1583                 ieee80211_send_4addr_nullfunc(local, sdata);
1584
1585         /*
1586          * Start timer to probe the connection to the AP now.
1587          * Also start the timer that will detect beacon loss.
1588          */
1589         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1590         ieee80211_sta_reset_beacon_monitor(sdata);
1591
1592         return true;
1593 }
1594
1595
1596 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1597                                   struct ieee80211_mgmt *mgmt,
1598                                   size_t len,
1599                                   struct ieee80211_rx_status *rx_status,
1600                                   struct ieee802_11_elems *elems,
1601                                   bool beacon)
1602 {
1603         struct ieee80211_local *local = sdata->local;
1604         int freq;
1605         struct ieee80211_bss *bss;
1606         struct ieee80211_channel *channel;
1607         bool need_ps = false;
1608
1609         if (sdata->u.mgd.associated) {
1610                 bss = (void *)sdata->u.mgd.associated->priv;
1611                 /* not previously set so we may need to recalc */
1612                 need_ps = !bss->dtim_period;
1613         }
1614
1615         if (elems->ds_params && elems->ds_params_len == 1)
1616                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
1617                                                       rx_status->band);
1618         else
1619                 freq = rx_status->freq;
1620
1621         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1622
1623         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1624                 return;
1625
1626         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1627                                         channel, beacon);
1628         if (bss)
1629                 ieee80211_rx_bss_put(local, bss);
1630
1631         if (!sdata->u.mgd.associated)
1632                 return;
1633
1634         if (need_ps) {
1635                 mutex_lock(&local->iflist_mtx);
1636                 ieee80211_recalc_ps(local, -1);
1637                 mutex_unlock(&local->iflist_mtx);
1638         }
1639
1640         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1641             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1642                                                         ETH_ALEN) == 0)) {
1643                 struct ieee80211_channel_sw_ie *sw_elem =
1644                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1645                 ieee80211_sta_process_chanswitch(sdata, sw_elem,
1646                                                  bss, rx_status->mactime);
1647         }
1648 }
1649
1650
1651 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1652                                          struct sk_buff *skb)
1653 {
1654         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1655         struct ieee80211_if_managed *ifmgd;
1656         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1657         size_t baselen, len = skb->len;
1658         struct ieee802_11_elems elems;
1659
1660         ifmgd = &sdata->u.mgd;
1661
1662         ASSERT_MGD_MTX(ifmgd);
1663
1664         if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1665                 return; /* ignore ProbeResp to foreign address */
1666
1667         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1668         if (baselen > len)
1669                 return;
1670
1671         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1672                                 &elems);
1673
1674         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1675
1676         if (ifmgd->associated &&
1677             memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0)
1678                 ieee80211_reset_ap_probe(sdata);
1679 }
1680
1681 /*
1682  * This is the canonical list of information elements we care about,
1683  * the filter code also gives us all changes to the Microsoft OUI
1684  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1685  *
1686  * We implement beacon filtering in software since that means we can
1687  * avoid processing the frame here and in cfg80211, and userspace
1688  * will not be able to tell whether the hardware supports it or not.
1689  *
1690  * XXX: This list needs to be dynamic -- userspace needs to be able to
1691  *      add items it requires. It also needs to be able to tell us to
1692  *      look out for other vendor IEs.
1693  */
1694 static const u64 care_about_ies =
1695         (1ULL << WLAN_EID_COUNTRY) |
1696         (1ULL << WLAN_EID_ERP_INFO) |
1697         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1698         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1699         (1ULL << WLAN_EID_HT_CAPABILITY) |
1700         (1ULL << WLAN_EID_HT_INFORMATION);
1701
1702 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1703                                      struct ieee80211_mgmt *mgmt,
1704                                      size_t len,
1705                                      struct ieee80211_rx_status *rx_status)
1706 {
1707         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1708         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1709         size_t baselen;
1710         struct ieee802_11_elems elems;
1711         struct ieee80211_local *local = sdata->local;
1712         u32 changed = 0;
1713         bool erp_valid, directed_tim = false;
1714         u8 erp_value = 0;
1715         u32 ncrc;
1716         u8 *bssid;
1717
1718         ASSERT_MGD_MTX(ifmgd);
1719
1720         /* Process beacon from the current BSS */
1721         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1722         if (baselen > len)
1723                 return;
1724
1725         if (rx_status->freq != local->hw.conf.channel->center_freq)
1726                 return;
1727
1728         /*
1729          * We might have received a number of frames, among them a
1730          * disassoc frame and a beacon...
1731          */
1732         if (!ifmgd->associated)
1733                 return;
1734
1735         bssid = ifmgd->associated->bssid;
1736
1737         /*
1738          * And in theory even frames from a different AP we were just
1739          * associated to a split-second ago!
1740          */
1741         if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1742                 return;
1743
1744         /* Track average RSSI from the Beacon frames of the current AP */
1745         ifmgd->last_beacon_signal = rx_status->signal;
1746         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
1747                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
1748                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
1749                 ifmgd->last_cqm_event_signal = 0;
1750                 ifmgd->count_beacon_signal = 1;
1751         } else {
1752                 ifmgd->ave_beacon_signal =
1753                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
1754                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
1755                          ifmgd->ave_beacon_signal) / 16;
1756                 ifmgd->count_beacon_signal++;
1757         }
1758         if (bss_conf->cqm_rssi_thold &&
1759             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
1760             !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) {
1761                 int sig = ifmgd->ave_beacon_signal / 16;
1762                 int last_event = ifmgd->last_cqm_event_signal;
1763                 int thold = bss_conf->cqm_rssi_thold;
1764                 int hyst = bss_conf->cqm_rssi_hyst;
1765                 if (sig < thold &&
1766                     (last_event == 0 || sig < last_event - hyst)) {
1767                         ifmgd->last_cqm_event_signal = sig;
1768                         ieee80211_cqm_rssi_notify(
1769                                 &sdata->vif,
1770                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
1771                                 GFP_KERNEL);
1772                 } else if (sig > thold &&
1773                            (last_event == 0 || sig > last_event + hyst)) {
1774                         ifmgd->last_cqm_event_signal = sig;
1775                         ieee80211_cqm_rssi_notify(
1776                                 &sdata->vif,
1777                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
1778                                 GFP_KERNEL);
1779                 }
1780         }
1781
1782         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1783 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1784                 if (net_ratelimit()) {
1785                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1786                                "to a received beacon\n", sdata->name);
1787                 }
1788 #endif
1789                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1790                 mutex_lock(&local->iflist_mtx);
1791                 ieee80211_recalc_ps(local, -1);
1792                 mutex_unlock(&local->iflist_mtx);
1793         }
1794
1795         /*
1796          * Push the beacon loss detection into the future since
1797          * we are processing a beacon from the AP just now.
1798          */
1799         ieee80211_sta_reset_beacon_monitor(sdata);
1800
1801         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1802         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1803                                           len - baselen, &elems,
1804                                           care_about_ies, ncrc);
1805
1806         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1807                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1808                                                    ifmgd->aid);
1809
1810         if (ncrc != ifmgd->beacon_crc || !ifmgd->beacon_crc_valid) {
1811                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1812                                       true);
1813
1814                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1815                                          elems.wmm_param_len);
1816         }
1817
1818         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1819                 if (directed_tim) {
1820                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1821                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1822                                 ieee80211_hw_config(local,
1823                                                     IEEE80211_CONF_CHANGE_PS);
1824                                 ieee80211_send_nullfunc(local, sdata, 0);
1825                         } else {
1826                                 local->pspolling = true;
1827
1828                                 /*
1829                                  * Here is assumed that the driver will be
1830                                  * able to send ps-poll frame and receive a
1831                                  * response even though power save mode is
1832                                  * enabled, but some drivers might require
1833                                  * to disable power save here. This needs
1834                                  * to be investigated.
1835                                  */
1836                                 ieee80211_send_pspoll(local, sdata);
1837                         }
1838                 }
1839         }
1840
1841         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
1842                 return;
1843         ifmgd->beacon_crc = ncrc;
1844         ifmgd->beacon_crc_valid = true;
1845
1846         if (elems.erp_info && elems.erp_info_len >= 1) {
1847                 erp_valid = true;
1848                 erp_value = elems.erp_info[0];
1849         } else {
1850                 erp_valid = false;
1851         }
1852         changed |= ieee80211_handle_bss_capability(sdata,
1853                         le16_to_cpu(mgmt->u.beacon.capab_info),
1854                         erp_valid, erp_value);
1855
1856
1857         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1858             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1859                 struct sta_info *sta;
1860                 struct ieee80211_supported_band *sband;
1861                 u16 ap_ht_cap_flags;
1862
1863                 rcu_read_lock();
1864
1865                 sta = sta_info_get(sdata, bssid);
1866                 if (WARN_ON(!sta)) {
1867                         rcu_read_unlock();
1868                         return;
1869                 }
1870
1871                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1872
1873                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1874                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1875
1876                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1877
1878                 rcu_read_unlock();
1879
1880                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1881                                                bssid, ap_ht_cap_flags);
1882         }
1883
1884         /* Note: country IE parsing is done for us by cfg80211 */
1885         if (elems.country_elem) {
1886                 /* TODO: IBSS also needs this */
1887                 if (elems.pwr_constr_elem)
1888                         ieee80211_handle_pwr_constr(sdata,
1889                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1890                                 elems.pwr_constr_elem,
1891                                 elems.pwr_constr_elem_len);
1892         }
1893
1894         ieee80211_bss_info_change_notify(sdata, changed);
1895 }
1896
1897 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1898                                   struct sk_buff *skb)
1899 {
1900         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1901         struct ieee80211_rx_status *rx_status;
1902         struct ieee80211_mgmt *mgmt;
1903         enum rx_mgmt_action rma = RX_MGMT_NONE;
1904         u16 fc;
1905
1906         rx_status = (struct ieee80211_rx_status *) skb->cb;
1907         mgmt = (struct ieee80211_mgmt *) skb->data;
1908         fc = le16_to_cpu(mgmt->frame_control);
1909
1910         mutex_lock(&ifmgd->mtx);
1911
1912         if (ifmgd->associated &&
1913             memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1914                 switch (fc & IEEE80211_FCTL_STYPE) {
1915                 case IEEE80211_STYPE_BEACON:
1916                         ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1917                                                  rx_status);
1918                         break;
1919                 case IEEE80211_STYPE_PROBE_RESP:
1920                         ieee80211_rx_mgmt_probe_resp(sdata, skb);
1921                         break;
1922                 case IEEE80211_STYPE_DEAUTH:
1923                         rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1924                         break;
1925                 case IEEE80211_STYPE_DISASSOC:
1926                         rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1927                         break;
1928                 case IEEE80211_STYPE_ACTION:
1929                         switch (mgmt->u.action.category) {
1930                         case WLAN_CATEGORY_SPECTRUM_MGMT:
1931                                 ieee80211_sta_process_chanswitch(sdata,
1932                                                 &mgmt->u.action.u.chan_switch.sw_elem,
1933                                                 (void *)ifmgd->associated->priv,
1934                                                 rx_status->mactime);
1935                                 break;
1936                         }
1937                 }
1938                 mutex_unlock(&ifmgd->mtx);
1939
1940                 switch (rma) {
1941                 case RX_MGMT_NONE:
1942                         /* no action */
1943                         break;
1944                 case RX_MGMT_CFG80211_DEAUTH:
1945                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1946                         break;
1947                 case RX_MGMT_CFG80211_DISASSOC:
1948                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1949                         break;
1950                 default:
1951                         WARN(1, "unexpected: %d", rma);
1952                 }
1953                 return;
1954         }
1955
1956         mutex_unlock(&ifmgd->mtx);
1957
1958         if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1959             (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH) {
1960                 struct ieee80211_local *local = sdata->local;
1961                 struct ieee80211_work *wk;
1962
1963                 mutex_lock(&local->mtx);
1964                 list_for_each_entry(wk, &local->work_list, list) {
1965                         if (wk->sdata != sdata)
1966                                 continue;
1967
1968                         if (wk->type != IEEE80211_WORK_ASSOC &&
1969                             wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
1970                                 continue;
1971
1972                         if (memcmp(mgmt->bssid, wk->filter_ta, ETH_ALEN))
1973                                 continue;
1974                         if (memcmp(mgmt->sa, wk->filter_ta, ETH_ALEN))
1975                                 continue;
1976
1977                         /*
1978                          * Printing the message only here means we can't
1979                          * spuriously print it, but it also means that it
1980                          * won't be printed when the frame comes in before
1981                          * we even tried to associate or in similar cases.
1982                          *
1983                          * Ultimately, I suspect cfg80211 should print the
1984                          * messages instead.
1985                          */
1986                         printk(KERN_DEBUG
1987                                "%s: deauthenticated from %pM (Reason: %u)\n",
1988                                sdata->name, mgmt->bssid,
1989                                le16_to_cpu(mgmt->u.deauth.reason_code));
1990
1991                         list_del_rcu(&wk->list);
1992                         free_work(wk);
1993                         break;
1994                 }
1995                 mutex_unlock(&local->mtx);
1996
1997                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1998         }
1999 }
2000
2001 static void ieee80211_sta_timer(unsigned long data)
2002 {
2003         struct ieee80211_sub_if_data *sdata =
2004                 (struct ieee80211_sub_if_data *) data;
2005         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2006         struct ieee80211_local *local = sdata->local;
2007
2008         if (local->quiescing) {
2009                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2010                 return;
2011         }
2012
2013         ieee80211_queue_work(&local->hw, &sdata->work);
2014 }
2015
2016 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
2017                                           u8 *bssid)
2018 {
2019         struct ieee80211_local *local = sdata->local;
2020         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2021
2022         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
2023                           IEEE80211_STA_BEACON_POLL);
2024
2025         ieee80211_set_disassoc(sdata, true, true);
2026         mutex_unlock(&ifmgd->mtx);
2027         mutex_lock(&local->mtx);
2028         ieee80211_recalc_idle(local);
2029         mutex_unlock(&local->mtx);
2030         /*
2031          * must be outside lock due to cfg80211,
2032          * but that's not a problem.
2033          */
2034         ieee80211_send_deauth_disassoc(sdata, bssid,
2035                         IEEE80211_STYPE_DEAUTH,
2036                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2037                         NULL, true);
2038         mutex_lock(&ifmgd->mtx);
2039 }
2040
2041 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
2042 {
2043         struct ieee80211_local *local = sdata->local;
2044         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2045
2046         /* then process the rest of the work */
2047         mutex_lock(&ifmgd->mtx);
2048
2049         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2050                             IEEE80211_STA_CONNECTION_POLL) &&
2051             ifmgd->associated) {
2052                 u8 bssid[ETH_ALEN];
2053                 int max_tries;
2054
2055                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
2056
2057                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2058                         max_tries = max_nullfunc_tries;
2059                 else
2060                         max_tries = max_probe_tries;
2061
2062                 /* ACK received for nullfunc probing frame */
2063                 if (!ifmgd->probe_send_count)
2064                         ieee80211_reset_ap_probe(sdata);
2065                 else if (ifmgd->nullfunc_failed) {
2066                         if (ifmgd->probe_send_count < max_tries) {
2067 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2068                                 wiphy_debug(local->hw.wiphy,
2069                                             "%s: No ack for nullfunc frame to"
2070                                             " AP %pM, try %d/%i\n",
2071                                             sdata->name, bssid,
2072                                             ifmgd->probe_send_count, max_tries);
2073 #endif
2074                                 ieee80211_mgd_probe_ap_send(sdata);
2075                         } else {
2076 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2077                                 wiphy_debug(local->hw.wiphy,
2078                                             "%s: No ack for nullfunc frame to"
2079                                             " AP %pM, disconnecting.\n",
2080                                             sdata->name, bssid);
2081 #endif
2082                                 ieee80211_sta_connection_lost(sdata, bssid);
2083                         }
2084                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
2085                         run_again(ifmgd, ifmgd->probe_timeout);
2086                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2087 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2088                         wiphy_debug(local->hw.wiphy,
2089                                     "%s: Failed to send nullfunc to AP %pM"
2090                                     " after %dms, disconnecting.\n",
2091                                     sdata->name,
2092                                     bssid, probe_wait_ms);
2093 #endif
2094                         ieee80211_sta_connection_lost(sdata, bssid);
2095                 } else if (ifmgd->probe_send_count < max_tries) {
2096 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2097                         wiphy_debug(local->hw.wiphy,
2098                                     "%s: No probe response from AP %pM"
2099                                     " after %dms, try %d/%i\n",
2100                                     sdata->name,
2101                                     bssid, probe_wait_ms,
2102                                     ifmgd->probe_send_count, max_tries);
2103 #endif
2104                         ieee80211_mgd_probe_ap_send(sdata);
2105                 } else {
2106                         /*
2107                          * We actually lost the connection ... or did we?
2108                          * Let's make sure!
2109                          */
2110                         wiphy_debug(local->hw.wiphy,
2111                                     "%s: No probe response from AP %pM"
2112                                     " after %dms, disconnecting.\n",
2113                                     sdata->name,
2114                                     bssid, probe_wait_ms);
2115
2116                         ieee80211_sta_connection_lost(sdata, bssid);
2117                 }
2118         }
2119
2120         mutex_unlock(&ifmgd->mtx);
2121 }
2122
2123 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
2124 {
2125         struct ieee80211_sub_if_data *sdata =
2126                 (struct ieee80211_sub_if_data *) data;
2127         struct ieee80211_local *local = sdata->local;
2128
2129         if (local->quiescing)
2130                 return;
2131
2132         ieee80211_queue_work(&sdata->local->hw,
2133                              &sdata->u.mgd.beacon_connection_loss_work);
2134 }
2135
2136 static void ieee80211_sta_conn_mon_timer(unsigned long data)
2137 {
2138         struct ieee80211_sub_if_data *sdata =
2139                 (struct ieee80211_sub_if_data *) data;
2140         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2141         struct ieee80211_local *local = sdata->local;
2142
2143         if (local->quiescing)
2144                 return;
2145
2146         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
2147 }
2148
2149 static void ieee80211_sta_monitor_work(struct work_struct *work)
2150 {
2151         struct ieee80211_sub_if_data *sdata =
2152                 container_of(work, struct ieee80211_sub_if_data,
2153                              u.mgd.monitor_work);
2154
2155         ieee80211_mgd_probe_ap(sdata, false);
2156 }
2157
2158 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2159 {
2160         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2161                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
2162                                         IEEE80211_STA_CONNECTION_POLL);
2163
2164                 /* let's probe the connection once */
2165                 ieee80211_queue_work(&sdata->local->hw,
2166                            &sdata->u.mgd.monitor_work);
2167                 /* and do all the other regular work too */
2168                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2169         }
2170 }
2171
2172 #ifdef CONFIG_PM
2173 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2174 {
2175         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2176
2177         /*
2178          * we need to use atomic bitops for the running bits
2179          * only because both timers might fire at the same
2180          * time -- the code here is properly synchronised.
2181          */
2182
2183         cancel_work_sync(&ifmgd->request_smps_work);
2184
2185         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
2186         if (del_timer_sync(&ifmgd->timer))
2187                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2188
2189         cancel_work_sync(&ifmgd->chswitch_work);
2190         if (del_timer_sync(&ifmgd->chswitch_timer))
2191                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2192
2193         cancel_work_sync(&ifmgd->monitor_work);
2194         /* these will just be re-established on connection */
2195         del_timer_sync(&ifmgd->conn_mon_timer);
2196         del_timer_sync(&ifmgd->bcn_mon_timer);
2197 }
2198
2199 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2200 {
2201         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2202
2203         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2204                 add_timer(&ifmgd->timer);
2205         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2206                 add_timer(&ifmgd->chswitch_timer);
2207         ieee80211_sta_reset_beacon_monitor(sdata);
2208         ieee80211_restart_sta_timer(sdata);
2209         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.monitor_work);
2210 }
2211 #endif
2212
2213 /* interface setup */
2214 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2215 {
2216         struct ieee80211_if_managed *ifmgd;
2217
2218         ifmgd = &sdata->u.mgd;
2219         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
2220         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2221         INIT_WORK(&ifmgd->beacon_connection_loss_work,
2222                   ieee80211_beacon_connection_loss_work);
2223         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
2224         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2225                     (unsigned long) sdata);
2226         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
2227                     (unsigned long) sdata);
2228         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
2229                     (unsigned long) sdata);
2230         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2231                     (unsigned long) sdata);
2232
2233         ifmgd->flags = 0;
2234
2235         mutex_init(&ifmgd->mtx);
2236
2237         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
2238                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
2239         else
2240                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
2241 }
2242
2243 /* scan finished notification */
2244 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2245 {
2246         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2247
2248         /* Restart STA timers */
2249         rcu_read_lock();
2250         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2251                 ieee80211_restart_sta_timer(sdata);
2252         rcu_read_unlock();
2253 }
2254
2255 int ieee80211_max_network_latency(struct notifier_block *nb,
2256                                   unsigned long data, void *dummy)
2257 {
2258         s32 latency_usec = (s32) data;
2259         struct ieee80211_local *local =
2260                 container_of(nb, struct ieee80211_local,
2261                              network_latency_notifier);
2262
2263         mutex_lock(&local->iflist_mtx);
2264         ieee80211_recalc_ps(local, latency_usec);
2265         mutex_unlock(&local->iflist_mtx);
2266
2267         return 0;
2268 }
2269
2270 /* config hooks */
2271 static enum work_done_result
2272 ieee80211_probe_auth_done(struct ieee80211_work *wk,
2273                           struct sk_buff *skb)
2274 {
2275         if (!skb) {
2276                 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
2277                 return WORK_DONE_DESTROY;
2278         }
2279
2280         if (wk->type == IEEE80211_WORK_AUTH) {
2281                 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
2282                 return WORK_DONE_DESTROY;
2283         }
2284
2285         mutex_lock(&wk->sdata->u.mgd.mtx);
2286         ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
2287         mutex_unlock(&wk->sdata->u.mgd.mtx);
2288
2289         wk->type = IEEE80211_WORK_AUTH;
2290         wk->probe_auth.tries = 0;
2291         return WORK_DONE_REQUEUE;
2292 }
2293
2294 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
2295                        struct cfg80211_auth_request *req)
2296 {
2297         const u8 *ssid;
2298         struct ieee80211_work *wk;
2299         u16 auth_alg;
2300
2301         if (req->local_state_change)
2302                 return 0; /* no need to update mac80211 state */
2303
2304         switch (req->auth_type) {
2305         case NL80211_AUTHTYPE_OPEN_SYSTEM:
2306                 auth_alg = WLAN_AUTH_OPEN;
2307                 break;
2308         case NL80211_AUTHTYPE_SHARED_KEY:
2309                 if (IS_ERR(sdata->local->wep_tx_tfm))
2310                         return -EOPNOTSUPP;
2311                 auth_alg = WLAN_AUTH_SHARED_KEY;
2312                 break;
2313         case NL80211_AUTHTYPE_FT:
2314                 auth_alg = WLAN_AUTH_FT;
2315                 break;
2316         case NL80211_AUTHTYPE_NETWORK_EAP:
2317                 auth_alg = WLAN_AUTH_LEAP;
2318                 break;
2319         default:
2320                 return -EOPNOTSUPP;
2321         }
2322
2323         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2324         if (!wk)
2325                 return -ENOMEM;
2326
2327         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2328
2329         if (req->ie && req->ie_len) {
2330                 memcpy(wk->ie, req->ie, req->ie_len);
2331                 wk->ie_len = req->ie_len;
2332         }
2333
2334         if (req->key && req->key_len) {
2335                 wk->probe_auth.key_len = req->key_len;
2336                 wk->probe_auth.key_idx = req->key_idx;
2337                 memcpy(wk->probe_auth.key, req->key, req->key_len);
2338         }
2339
2340         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2341         memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
2342         wk->probe_auth.ssid_len = ssid[1];
2343
2344         wk->probe_auth.algorithm = auth_alg;
2345         wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
2346
2347         /* if we already have a probe, don't probe again */
2348         if (req->bss->proberesp_ies)
2349                 wk->type = IEEE80211_WORK_AUTH;
2350         else
2351                 wk->type = IEEE80211_WORK_DIRECT_PROBE;
2352         wk->chan = req->bss->channel;
2353         wk->chan_type = NL80211_CHAN_NO_HT;
2354         wk->sdata = sdata;
2355         wk->done = ieee80211_probe_auth_done;
2356
2357         ieee80211_add_work(wk);
2358         return 0;
2359 }
2360
2361 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
2362                                                   struct sk_buff *skb)
2363 {
2364         struct ieee80211_mgmt *mgmt;
2365         struct ieee80211_rx_status *rx_status;
2366         struct ieee802_11_elems elems;
2367         u16 status;
2368
2369         if (!skb) {
2370                 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
2371                 return WORK_DONE_DESTROY;
2372         }
2373
2374         if (wk->type == IEEE80211_WORK_ASSOC_BEACON_WAIT) {
2375                 mutex_lock(&wk->sdata->u.mgd.mtx);
2376                 rx_status = (void *) skb->cb;
2377                 ieee802_11_parse_elems(skb->data + 24 + 12, skb->len - 24 - 12, &elems);
2378                 ieee80211_rx_bss_info(wk->sdata, (void *)skb->data, skb->len, rx_status,
2379                                       &elems, true);
2380                 mutex_unlock(&wk->sdata->u.mgd.mtx);
2381
2382                 wk->type = IEEE80211_WORK_ASSOC;
2383                 /* not really done yet */
2384                 return WORK_DONE_REQUEUE;
2385         }
2386
2387         mgmt = (void *)skb->data;
2388         status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2389
2390         if (status == WLAN_STATUS_SUCCESS) {
2391                 mutex_lock(&wk->sdata->u.mgd.mtx);
2392                 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
2393                         mutex_unlock(&wk->sdata->u.mgd.mtx);
2394                         /* oops -- internal error -- send timeout for now */
2395                         cfg80211_send_assoc_timeout(wk->sdata->dev,
2396                                                     wk->filter_ta);
2397                         return WORK_DONE_DESTROY;
2398                 }
2399
2400                 mutex_unlock(&wk->sdata->u.mgd.mtx);
2401         }
2402
2403         cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
2404         return WORK_DONE_DESTROY;
2405 }
2406
2407 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2408                         struct cfg80211_assoc_request *req)
2409 {
2410         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2411         struct ieee80211_bss *bss = (void *)req->bss->priv;
2412         struct ieee80211_work *wk;
2413         const u8 *ssid;
2414         int i;
2415
2416         mutex_lock(&ifmgd->mtx);
2417         if (ifmgd->associated) {
2418                 if (!req->prev_bssid ||
2419                     memcmp(req->prev_bssid, ifmgd->associated->bssid,
2420                            ETH_ALEN)) {
2421                         /*
2422                          * We are already associated and the request was not a
2423                          * reassociation request from the current BSS, so
2424                          * reject it.
2425                          */
2426                         mutex_unlock(&ifmgd->mtx);
2427                         return -EALREADY;
2428                 }
2429
2430                 /* Trying to reassociate - clear previous association state */
2431                 ieee80211_set_disassoc(sdata, true, false);
2432         }
2433         mutex_unlock(&ifmgd->mtx);
2434
2435         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2436         if (!wk)
2437                 return -ENOMEM;
2438
2439         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2440         ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
2441
2442         ifmgd->beacon_crc_valid = false;
2443
2444         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2445                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2446                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2447                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2448                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2449
2450
2451         if (req->ie && req->ie_len) {
2452                 memcpy(wk->ie, req->ie, req->ie_len);
2453                 wk->ie_len = req->ie_len;
2454         } else
2455                 wk->ie_len = 0;
2456
2457         wk->assoc.bss = req->bss;
2458
2459         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2460
2461         /* new association always uses requested smps mode */
2462         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
2463                 if (ifmgd->powersave)
2464                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
2465                 else
2466                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
2467         } else
2468                 ifmgd->ap_smps = ifmgd->req_smps;
2469
2470         wk->assoc.smps = ifmgd->ap_smps;
2471         /*
2472          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
2473          * We still associate in non-HT mode (11a/b/g) if any one of these
2474          * ciphers is configured as pairwise.
2475          * We can set this to true for non-11n hardware, that'll be checked
2476          * separately along with the peer capabilities.
2477          */
2478         wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
2479         wk->assoc.capability = req->bss->capability;
2480         wk->assoc.wmm_used = bss->wmm_used;
2481         wk->assoc.supp_rates = bss->supp_rates;
2482         wk->assoc.supp_rates_len = bss->supp_rates_len;
2483         wk->assoc.ht_information_ie =
2484                 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
2485
2486         if (bss->wmm_used && bss->uapsd_supported &&
2487             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
2488                 wk->assoc.uapsd_used = true;
2489                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
2490         } else {
2491                 wk->assoc.uapsd_used = false;
2492                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
2493         }
2494
2495         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2496         memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
2497         wk->assoc.ssid_len = ssid[1];
2498
2499         if (req->prev_bssid)
2500                 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
2501
2502         wk->chan = req->bss->channel;
2503         wk->chan_type = NL80211_CHAN_NO_HT;
2504         wk->sdata = sdata;
2505         wk->done = ieee80211_assoc_done;
2506         if (!bss->dtim_period &&
2507             sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
2508                 wk->type = IEEE80211_WORK_ASSOC_BEACON_WAIT;
2509         else
2510                 wk->type = IEEE80211_WORK_ASSOC;
2511
2512         if (req->use_mfp) {
2513                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2514                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2515         } else {
2516                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2517                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2518         }
2519
2520         if (req->crypto.control_port)
2521                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2522         else
2523                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2524
2525         sdata->control_port_protocol = req->crypto.control_port_ethertype;
2526         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
2527
2528         ieee80211_add_work(wk);
2529         return 0;
2530 }
2531
2532 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2533                          struct cfg80211_deauth_request *req,
2534                          void *cookie)
2535 {
2536         struct ieee80211_local *local = sdata->local;
2537         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2538         struct ieee80211_work *wk;
2539         u8 bssid[ETH_ALEN];
2540         bool assoc_bss = false;
2541
2542         mutex_lock(&ifmgd->mtx);
2543
2544         memcpy(bssid, req->bss->bssid, ETH_ALEN);
2545         if (ifmgd->associated == req->bss) {
2546                 ieee80211_set_disassoc(sdata, false, true);
2547                 mutex_unlock(&ifmgd->mtx);
2548                 assoc_bss = true;
2549         } else {
2550                 bool not_auth_yet = false;
2551
2552                 mutex_unlock(&ifmgd->mtx);
2553
2554                 mutex_lock(&local->mtx);
2555                 list_for_each_entry(wk, &local->work_list, list) {
2556                         if (wk->sdata != sdata)
2557                                 continue;
2558
2559                         if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2560                             wk->type != IEEE80211_WORK_AUTH &&
2561                             wk->type != IEEE80211_WORK_ASSOC &&
2562                             wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
2563                                 continue;
2564
2565                         if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2566                                 continue;
2567
2568                         not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2569                         list_del_rcu(&wk->list);
2570                         free_work(wk);
2571                         break;
2572                 }
2573                 mutex_unlock(&local->mtx);
2574
2575                 /*
2576                  * If somebody requests authentication and we haven't
2577                  * sent out an auth frame yet there's no need to send
2578                  * out a deauth frame either. If the state was PROBE,
2579                  * then this is the case. If it's AUTH we have sent a
2580                  * frame, and if it's IDLE we have completed the auth
2581                  * process already.
2582                  */
2583                 if (not_auth_yet) {
2584                         __cfg80211_auth_canceled(sdata->dev, bssid);
2585                         return 0;
2586                 }
2587         }
2588
2589         printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2590                sdata->name, bssid, req->reason_code);
2591
2592         ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH,
2593                                        req->reason_code, cookie,
2594                                        !req->local_state_change);
2595         if (assoc_bss)
2596                 sta_info_destroy_addr(sdata, bssid);
2597
2598         mutex_lock(&sdata->local->mtx);
2599         ieee80211_recalc_idle(sdata->local);
2600         mutex_unlock(&sdata->local->mtx);
2601
2602         return 0;
2603 }
2604
2605 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2606                            struct cfg80211_disassoc_request *req,
2607                            void *cookie)
2608 {
2609         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2610         u8 bssid[ETH_ALEN];
2611
2612         mutex_lock(&ifmgd->mtx);
2613
2614         /*
2615          * cfg80211 should catch this ... but it's racy since
2616          * we can receive a disassoc frame, process it, hand it
2617          * to cfg80211 while that's in a locked section already
2618          * trying to tell us that the user wants to disconnect.
2619          */
2620         if (ifmgd->associated != req->bss) {
2621                 mutex_unlock(&ifmgd->mtx);
2622                 return -ENOLINK;
2623         }
2624
2625         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2626                sdata->name, req->bss->bssid, req->reason_code);
2627
2628         memcpy(bssid, req->bss->bssid, ETH_ALEN);
2629         ieee80211_set_disassoc(sdata, false, true);
2630
2631         mutex_unlock(&ifmgd->mtx);
2632
2633         ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2634                         IEEE80211_STYPE_DISASSOC, req->reason_code,
2635                         cookie, !req->local_state_change);
2636         sta_info_destroy_addr(sdata, bssid);
2637
2638         mutex_lock(&sdata->local->mtx);
2639         ieee80211_recalc_idle(sdata->local);
2640         mutex_unlock(&sdata->local->mtx);
2641
2642         return 0;
2643 }
2644
2645 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
2646                                enum nl80211_cqm_rssi_threshold_event rssi_event,
2647                                gfp_t gfp)
2648 {
2649         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2650
2651         trace_api_cqm_rssi_notify(sdata, rssi_event);
2652
2653         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
2654 }
2655 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
2656
2657 unsigned char ieee80211_get_operstate(struct ieee80211_vif *vif)
2658 {
2659         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2660         return sdata->dev->operstate;
2661 }
2662 EXPORT_SYMBOL(ieee80211_get_operstate);