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