d89e87866e518d642ba1222b3cb44a6f71f1ea12
[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_rx_auth() */
94         RX_MGMT_CFG80211_AUTH,
95
96         /* caller must call cfg80211_send_rx_assoc() */
97         RX_MGMT_CFG80211_ASSOC,
98
99         /* caller must call cfg80211_send_deauth() */
100         RX_MGMT_CFG80211_DEAUTH,
101
102         /* caller must call cfg80211_send_disassoc() */
103         RX_MGMT_CFG80211_DISASSOC,
104
105         /* caller must tell cfg80211 about internal error */
106         RX_MGMT_CFG80211_ASSOC_ERROR,
107 };
108
109 /* utils */
110 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
111 {
112         lockdep_assert_held(&ifmgd->mtx);
113 }
114
115 /*
116  * We can have multiple work items (and connection probing)
117  * scheduling this timer, but we need to take care to only
118  * reschedule it when it should fire _earlier_ than it was
119  * asked for before, or if it's not pending right now. This
120  * function ensures that. Note that it then is required to
121  * run this function for all timeouts after the first one
122  * has happened -- the work that runs from this timer will
123  * do that.
124  */
125 static void run_again(struct ieee80211_if_managed *ifmgd,
126                              unsigned long timeout)
127 {
128         ASSERT_MGD_MTX(ifmgd);
129
130         if (!timer_pending(&ifmgd->timer) ||
131             time_before(timeout, ifmgd->timer.expires))
132                 mod_timer(&ifmgd->timer, timeout);
133 }
134
135 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
136 {
137         if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
138                 return;
139
140         mod_timer(&sdata->u.mgd.bcn_mon_timer,
141                   round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
142 }
143
144 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
145 {
146         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
147
148         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
149                 return;
150
151         mod_timer(&sdata->u.mgd.conn_mon_timer,
152                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
153
154         ifmgd->probe_send_count = 0;
155 }
156
157 static int ecw2cw(int ecw)
158 {
159         return (1 << ecw) - 1;
160 }
161
162 /*
163  * ieee80211_enable_ht should be called only after the operating band
164  * has been determined as ht configuration depends on the hw's
165  * HT abilities for a specific band.
166  */
167 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
168                                struct ieee80211_ht_info *hti,
169                                const u8 *bssid, u16 ap_ht_cap_flags)
170 {
171         struct ieee80211_local *local = sdata->local;
172         struct ieee80211_supported_band *sband;
173         struct sta_info *sta;
174         u32 changed = 0;
175         int hti_cfreq;
176         u16 ht_opmode;
177         bool enable_ht = true;
178         enum nl80211_channel_type prev_chantype;
179         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
180
181         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
182
183         prev_chantype = sdata->vif.bss_conf.channel_type;
184
185         /* HT is not supported */
186         if (!sband->ht_cap.ht_supported)
187                 enable_ht = false;
188
189         if (enable_ht) {
190                 hti_cfreq = ieee80211_channel_to_frequency(hti->control_chan,
191                                                            sband->band);
192                 /* check that channel matches the right operating channel */
193                 if (local->hw.conf.channel->center_freq != hti_cfreq) {
194                         /* Some APs mess this up, evidently.
195                          * Netgear WNDR3700 sometimes reports 4 higher than
196                          * the actual channel, for instance.
197                          */
198                         printk(KERN_DEBUG
199                                "%s: Wrong control channel in association"
200                                " response: configured center-freq: %d"
201                                " hti-cfreq: %d  hti->control_chan: %d"
202                                " band: %d.  Disabling HT.\n",
203                                sdata->name,
204                                local->hw.conf.channel->center_freq,
205                                hti_cfreq, hti->control_chan,
206                                sband->band);
207                         enable_ht = false;
208                 }
209         }
210
211         if (enable_ht) {
212                 channel_type = NL80211_CHAN_HT20;
213
214                 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
215                     (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
216                     (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
217                         switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
218                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
219                                 if (!(local->hw.conf.channel->flags &
220                                     IEEE80211_CHAN_NO_HT40PLUS))
221                                         channel_type = NL80211_CHAN_HT40PLUS;
222                                 break;
223                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
224                                 if (!(local->hw.conf.channel->flags &
225                                     IEEE80211_CHAN_NO_HT40MINUS))
226                                         channel_type = NL80211_CHAN_HT40MINUS;
227                                 break;
228                         }
229                 }
230         }
231
232         if (local->tmp_channel)
233                 local->tmp_channel_type = channel_type;
234
235         if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
236                 /* can only fail due to HT40+/- mismatch */
237                 channel_type = NL80211_CHAN_HT20;
238                 WARN_ON(!ieee80211_set_channel_type(local, sdata, channel_type));
239         }
240
241         /* channel_type change automatically detected */
242         ieee80211_hw_config(local, 0);
243
244         if (prev_chantype != channel_type) {
245                 rcu_read_lock();
246                 sta = sta_info_get(sdata, bssid);
247                 if (sta)
248                         rate_control_rate_update(local, sband, sta,
249                                                  IEEE80211_RC_HT_CHANGED,
250                                                  channel_type);
251                 rcu_read_unlock();
252         }
253
254         ht_opmode = le16_to_cpu(hti->operation_mode);
255
256         /* if bss configuration changed store the new one */
257         if (sdata->ht_opmode_valid != enable_ht ||
258             sdata->vif.bss_conf.ht_operation_mode != ht_opmode ||
259             prev_chantype != channel_type) {
260                 changed |= BSS_CHANGED_HT;
261                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
262                 sdata->ht_opmode_valid = enable_ht;
263         }
264
265         return changed;
266 }
267
268 /* frame sending functions */
269
270 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
271                                            const u8 *bssid, u16 stype, u16 reason,
272                                            void *cookie, bool send_frame)
273 {
274         struct ieee80211_local *local = sdata->local;
275         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
276         struct sk_buff *skb;
277         struct ieee80211_mgmt *mgmt;
278
279         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
280         if (!skb) {
281                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
282                        "deauth/disassoc frame\n", sdata->name);
283                 return;
284         }
285         skb_reserve(skb, local->hw.extra_tx_headroom);
286
287         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
288         memset(mgmt, 0, 24);
289         memcpy(mgmt->da, bssid, ETH_ALEN);
290         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
291         memcpy(mgmt->bssid, bssid, ETH_ALEN);
292         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
293         skb_put(skb, 2);
294         /* u.deauth.reason_code == u.disassoc.reason_code */
295         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
296
297         if (stype == IEEE80211_STYPE_DEAUTH)
298                 if (cookie)
299                         __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
300                 else
301                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
302         else
303                 if (cookie)
304                         __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
305                 else
306                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
307         if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
308                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
309
310         if (send_frame)
311                 ieee80211_tx_skb(sdata, skb);
312         else
313                 kfree_skb(skb);
314 }
315
316 void ieee80211_send_pspoll(struct ieee80211_local *local,
317                            struct ieee80211_sub_if_data *sdata)
318 {
319         struct ieee80211_pspoll *pspoll;
320         struct sk_buff *skb;
321
322         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
323         if (!skb)
324                 return;
325
326         pspoll = (struct ieee80211_pspoll *) skb->data;
327         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
328
329         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
330         ieee80211_tx_skb(sdata, skb);
331 }
332
333 void ieee80211_send_nullfunc(struct ieee80211_local *local,
334                              struct ieee80211_sub_if_data *sdata,
335                              int powersave)
336 {
337         struct sk_buff *skb;
338         struct ieee80211_hdr_3addr *nullfunc;
339
340         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
341         if (!skb)
342                 return;
343
344         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
345         if (powersave)
346                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
347
348         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
349         ieee80211_tx_skb(sdata, skb);
350 }
351
352 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
353                                           struct ieee80211_sub_if_data *sdata)
354 {
355         struct sk_buff *skb;
356         struct ieee80211_hdr *nullfunc;
357         __le16 fc;
358
359         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
360                 return;
361
362         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
363         if (!skb) {
364                 printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr "
365                        "nullfunc frame\n", sdata->name);
366                 return;
367         }
368         skb_reserve(skb, local->hw.extra_tx_headroom);
369
370         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
371         memset(nullfunc, 0, 30);
372         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
373                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
374         nullfunc->frame_control = fc;
375         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
376         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
377         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
378         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
379
380         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
381         ieee80211_tx_skb(sdata, skb);
382 }
383
384 /* spectrum management related things */
385 static void ieee80211_chswitch_work(struct work_struct *work)
386 {
387         struct ieee80211_sub_if_data *sdata =
388                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
389         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
390
391         if (!ieee80211_sdata_running(sdata))
392                 return;
393
394         mutex_lock(&ifmgd->mtx);
395         if (!ifmgd->associated)
396                 goto out;
397
398         sdata->local->oper_channel = sdata->local->csa_channel;
399         if (!sdata->local->ops->channel_switch) {
400                 /* call "hw_config" only if doing sw channel switch */
401                 ieee80211_hw_config(sdata->local,
402                         IEEE80211_CONF_CHANGE_CHANNEL);
403         }
404
405         /* XXX: shouldn't really modify cfg80211-owned data! */
406         ifmgd->associated->channel = sdata->local->oper_channel;
407
408         ieee80211_wake_queues_by_reason(&sdata->local->hw,
409                                         IEEE80211_QUEUE_STOP_REASON_CSA);
410  out:
411         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
412         mutex_unlock(&ifmgd->mtx);
413 }
414
415 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
416 {
417         struct ieee80211_sub_if_data *sdata;
418         struct ieee80211_if_managed *ifmgd;
419
420         sdata = vif_to_sdata(vif);
421         ifmgd = &sdata->u.mgd;
422
423         trace_api_chswitch_done(sdata, success);
424         if (!success) {
425                 /*
426                  * If the channel switch was not successful, stay
427                  * around on the old channel. We currently lack
428                  * good handling of this situation, possibly we
429                  * should just drop the association.
430                  */
431                 sdata->local->csa_channel = sdata->local->oper_channel;
432         }
433
434         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
435 }
436 EXPORT_SYMBOL(ieee80211_chswitch_done);
437
438 static void ieee80211_chswitch_timer(unsigned long data)
439 {
440         struct ieee80211_sub_if_data *sdata =
441                 (struct ieee80211_sub_if_data *) data;
442         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
443
444         if (sdata->local->quiescing) {
445                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
446                 return;
447         }
448
449         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
450 }
451
452 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
453                                       struct ieee80211_channel_sw_ie *sw_elem,
454                                       struct ieee80211_bss *bss,
455                                       u64 timestamp)
456 {
457         struct cfg80211_bss *cbss =
458                 container_of((void *)bss, struct cfg80211_bss, priv);
459         struct ieee80211_channel *new_ch;
460         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
461         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num,
462                                                       cbss->channel->band);
463
464         ASSERT_MGD_MTX(ifmgd);
465
466         if (!ifmgd->associated)
467                 return;
468
469         if (sdata->local->scanning)
470                 return;
471
472         /* Disregard subsequent beacons if we are already running a timer
473            processing a CSA */
474
475         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
476                 return;
477
478         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
479         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
480                 return;
481
482         sdata->local->csa_channel = new_ch;
483
484         if (sdata->local->ops->channel_switch) {
485                 /* use driver's channel switch callback */
486                 struct ieee80211_channel_switch ch_switch;
487                 memset(&ch_switch, 0, sizeof(ch_switch));
488                 ch_switch.timestamp = timestamp;
489                 if (sw_elem->mode) {
490                         ch_switch.block_tx = true;
491                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
492                                         IEEE80211_QUEUE_STOP_REASON_CSA);
493                 }
494                 ch_switch.channel = new_ch;
495                 ch_switch.count = sw_elem->count;
496                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
497                 drv_channel_switch(sdata->local, &ch_switch);
498                 return;
499         }
500
501         /* channel switch handled in software */
502         if (sw_elem->count <= 1) {
503                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
504         } else {
505                 if (sw_elem->mode)
506                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
507                                         IEEE80211_QUEUE_STOP_REASON_CSA);
508                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
509                 mod_timer(&ifmgd->chswitch_timer,
510                           jiffies +
511                           msecs_to_jiffies(sw_elem->count *
512                                            cbss->beacon_interval));
513         }
514 }
515
516 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
517                                         u16 capab_info, u8 *pwr_constr_elem,
518                                         u8 pwr_constr_elem_len)
519 {
520         struct ieee80211_conf *conf = &sdata->local->hw.conf;
521
522         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
523                 return;
524
525         /* Power constraint IE length should be 1 octet */
526         if (pwr_constr_elem_len != 1)
527                 return;
528
529         if ((*pwr_constr_elem <= conf->channel->max_power) &&
530             (*pwr_constr_elem != sdata->local->power_constr_level)) {
531                 sdata->local->power_constr_level = *pwr_constr_elem;
532                 ieee80211_hw_config(sdata->local, 0);
533         }
534 }
535
536 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif)
537 {
538         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
539         struct ieee80211_local *local = sdata->local;
540         struct ieee80211_conf *conf = &local->hw.conf;
541
542         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
543                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
544                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
545
546         local->disable_dynamic_ps = false;
547         conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout;
548 }
549 EXPORT_SYMBOL(ieee80211_enable_dyn_ps);
550
551 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif)
552 {
553         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
554         struct ieee80211_local *local = sdata->local;
555         struct ieee80211_conf *conf = &local->hw.conf;
556
557         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
558                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
559                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
560
561         local->disable_dynamic_ps = true;
562         conf->dynamic_ps_timeout = 0;
563         del_timer_sync(&local->dynamic_ps_timer);
564         ieee80211_queue_work(&local->hw,
565                              &local->dynamic_ps_enable_work);
566 }
567 EXPORT_SYMBOL(ieee80211_disable_dyn_ps);
568
569 /* powersave */
570 static void ieee80211_enable_ps(struct ieee80211_local *local,
571                                 struct ieee80211_sub_if_data *sdata)
572 {
573         struct ieee80211_conf *conf = &local->hw.conf;
574
575         /*
576          * If we are scanning right now then the parameters will
577          * take effect when scan finishes.
578          */
579         if (local->scanning)
580                 return;
581
582         if (conf->dynamic_ps_timeout > 0 &&
583             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
584                 mod_timer(&local->dynamic_ps_timer, jiffies +
585                           msecs_to_jiffies(conf->dynamic_ps_timeout));
586         } else {
587                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
588                         ieee80211_send_nullfunc(local, sdata, 1);
589
590                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
591                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
592                         return;
593
594                 conf->flags |= IEEE80211_CONF_PS;
595                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
596         }
597 }
598
599 static void ieee80211_change_ps(struct ieee80211_local *local)
600 {
601         struct ieee80211_conf *conf = &local->hw.conf;
602
603         if (local->ps_sdata) {
604                 ieee80211_enable_ps(local, local->ps_sdata);
605         } else if (conf->flags & IEEE80211_CONF_PS) {
606                 conf->flags &= ~IEEE80211_CONF_PS;
607                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
608                 del_timer_sync(&local->dynamic_ps_timer);
609                 cancel_work_sync(&local->dynamic_ps_enable_work);
610         }
611 }
612
613 /* need to hold RTNL or interface lock */
614 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
615 {
616         struct ieee80211_sub_if_data *sdata, *found = NULL;
617         int count = 0;
618         int timeout;
619
620         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
621                 local->ps_sdata = NULL;
622                 return;
623         }
624
625         if (!list_empty(&local->work_list)) {
626                 local->ps_sdata = NULL;
627                 goto change;
628         }
629
630         list_for_each_entry(sdata, &local->interfaces, list) {
631                 if (!ieee80211_sdata_running(sdata))
632                         continue;
633                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
634                         /* If an AP vif is found, then disable PS
635                          * by setting the count to zero thereby setting
636                          * ps_sdata to NULL.
637                          */
638                         count = 0;
639                         break;
640                 }
641                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
642                         continue;
643                 found = sdata;
644                 count++;
645         }
646
647         if (count == 1 && found->u.mgd.powersave &&
648             found->u.mgd.associated &&
649             found->u.mgd.associated->beacon_ies &&
650             !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
651                                     IEEE80211_STA_CONNECTION_POLL))) {
652                 struct ieee80211_conf *conf = &local->hw.conf;
653                 s32 beaconint_us;
654
655                 if (latency < 0)
656                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
657
658                 beaconint_us = ieee80211_tu_to_usec(
659                                         found->vif.bss_conf.beacon_int);
660
661                 timeout = local->dynamic_ps_forced_timeout;
662                 if (timeout < 0) {
663                         /*
664                          * Go to full PSM if the user configures a very low
665                          * latency requirement.
666                          * The 2000 second value is there for compatibility
667                          * until the PM_QOS_NETWORK_LATENCY is configured
668                          * with real values.
669                          */
670                         if (latency > (1900 * USEC_PER_MSEC) &&
671                             latency != (2000 * USEC_PER_SEC))
672                                 timeout = 0;
673                         else
674                                 timeout = 100;
675                 }
676                 local->dynamic_ps_user_timeout = timeout;
677                 if (!local->disable_dynamic_ps)
678                         conf->dynamic_ps_timeout =
679                                 local->dynamic_ps_user_timeout;
680
681                 if (beaconint_us > latency) {
682                         local->ps_sdata = NULL;
683                 } else {
684                         struct ieee80211_bss *bss;
685                         int maxslp = 1;
686                         u8 dtimper;
687
688                         bss = (void *)found->u.mgd.associated->priv;
689                         dtimper = bss->dtim_period;
690
691                         /* If the TIM IE is invalid, pretend the value is 1 */
692                         if (!dtimper)
693                                 dtimper = 1;
694                         else if (dtimper > 1)
695                                 maxslp = min_t(int, dtimper,
696                                                     latency / beaconint_us);
697
698                         local->hw.conf.max_sleep_period = maxslp;
699                         local->hw.conf.ps_dtim_period = dtimper;
700                         local->ps_sdata = found;
701                 }
702         } else {
703                 local->ps_sdata = NULL;
704         }
705
706  change:
707         ieee80211_change_ps(local);
708 }
709
710 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
711 {
712         struct ieee80211_local *local =
713                 container_of(work, struct ieee80211_local,
714                              dynamic_ps_disable_work);
715
716         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
717                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
718                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
719         }
720
721         ieee80211_wake_queues_by_reason(&local->hw,
722                                         IEEE80211_QUEUE_STOP_REASON_PS);
723 }
724
725 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
726 {
727         struct ieee80211_local *local =
728                 container_of(work, struct ieee80211_local,
729                              dynamic_ps_enable_work);
730         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
731         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
732
733         /* can only happen when PS was just disabled anyway */
734         if (!sdata)
735                 return;
736
737         if (local->hw.conf.flags & IEEE80211_CONF_PS)
738                 return;
739
740         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
741             (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)))
742                 ieee80211_send_nullfunc(local, sdata, 1);
743
744         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
745               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
746             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
747                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
748                 local->hw.conf.flags |= IEEE80211_CONF_PS;
749                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
750         }
751 }
752
753 void ieee80211_dynamic_ps_timer(unsigned long data)
754 {
755         struct ieee80211_local *local = (void *) data;
756
757         if (local->quiescing || local->suspended)
758                 return;
759
760         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
761 }
762
763 /* MLME */
764 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
765                                      struct ieee80211_sub_if_data *sdata,
766                                      u8 *wmm_param, size_t wmm_param_len)
767 {
768         struct ieee80211_tx_queue_params params;
769         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
770         size_t left;
771         int count;
772         u8 *pos, uapsd_queues = 0;
773
774         if (!local->ops->conf_tx)
775                 return;
776
777         if (local->hw.queues < 4)
778                 return;
779
780         if (!wmm_param)
781                 return;
782
783         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
784                 return;
785
786         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
787                 uapsd_queues = local->uapsd_queues;
788
789         count = wmm_param[6] & 0x0f;
790         if (count == ifmgd->wmm_last_param_set)
791                 return;
792         ifmgd->wmm_last_param_set = count;
793
794         pos = wmm_param + 8;
795         left = wmm_param_len - 8;
796
797         memset(&params, 0, sizeof(params));
798
799         local->wmm_acm = 0;
800         for (; left >= 4; left -= 4, pos += 4) {
801                 int aci = (pos[0] >> 5) & 0x03;
802                 int acm = (pos[0] >> 4) & 0x01;
803                 bool uapsd = false;
804                 int queue;
805
806                 switch (aci) {
807                 case 1: /* AC_BK */
808                         queue = 3;
809                         if (acm)
810                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
811                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
812                                 uapsd = true;
813                         break;
814                 case 2: /* AC_VI */
815                         queue = 1;
816                         if (acm)
817                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
818                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
819                                 uapsd = true;
820                         break;
821                 case 3: /* AC_VO */
822                         queue = 0;
823                         if (acm)
824                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
825                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
826                                 uapsd = true;
827                         break;
828                 case 0: /* AC_BE */
829                 default:
830                         queue = 2;
831                         if (acm)
832                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
833                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
834                                 uapsd = true;
835                         break;
836                 }
837
838                 params.aifs = pos[0] & 0x0f;
839                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
840                 params.cw_min = ecw2cw(pos[1] & 0x0f);
841                 params.txop = get_unaligned_le16(pos + 2);
842                 params.uapsd = uapsd;
843
844 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
845                 wiphy_debug(local->hw.wiphy,
846                             "WMM queue=%d aci=%d acm=%d aifs=%d "
847                             "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
848                             queue, aci, acm,
849                             params.aifs, params.cw_min, params.cw_max,
850                             params.txop, params.uapsd);
851 #endif
852                 if (drv_conf_tx(local, queue, &params))
853                         wiphy_debug(local->hw.wiphy,
854                                     "failed to set TX queue parameters for queue %d\n",
855                                     queue);
856         }
857
858         /* enable WMM or activate new settings */
859         sdata->vif.bss_conf.qos = true;
860         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
861 }
862
863 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
864                                            u16 capab, bool erp_valid, u8 erp)
865 {
866         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
867         u32 changed = 0;
868         bool use_protection;
869         bool use_short_preamble;
870         bool use_short_slot;
871
872         if (erp_valid) {
873                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
874                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
875         } else {
876                 use_protection = false;
877                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
878         }
879
880         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
881         if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
882                 use_short_slot = true;
883
884         if (use_protection != bss_conf->use_cts_prot) {
885                 bss_conf->use_cts_prot = use_protection;
886                 changed |= BSS_CHANGED_ERP_CTS_PROT;
887         }
888
889         if (use_short_preamble != bss_conf->use_short_preamble) {
890                 bss_conf->use_short_preamble = use_short_preamble;
891                 changed |= BSS_CHANGED_ERP_PREAMBLE;
892         }
893
894         if (use_short_slot != bss_conf->use_short_slot) {
895                 bss_conf->use_short_slot = use_short_slot;
896                 changed |= BSS_CHANGED_ERP_SLOT;
897         }
898
899         return changed;
900 }
901
902 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
903                                      struct cfg80211_bss *cbss,
904                                      u32 bss_info_changed)
905 {
906         struct ieee80211_bss *bss = (void *)cbss->priv;
907         struct ieee80211_local *local = sdata->local;
908         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
909
910         bss_info_changed |= BSS_CHANGED_ASSOC;
911         /* set timing information */
912         bss_conf->beacon_int = cbss->beacon_interval;
913         bss_conf->timestamp = cbss->tsf;
914
915         bss_info_changed |= BSS_CHANGED_BEACON_INT;
916         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
917                 cbss->capability, bss->has_erp_value, bss->erp_value);
918
919         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
920                 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int));
921
922         sdata->u.mgd.associated = cbss;
923         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
924
925         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
926
927         /* just to be sure */
928         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
929                                 IEEE80211_STA_BEACON_POLL);
930
931         ieee80211_led_assoc(local, 1);
932
933         if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
934                 bss_conf->dtim_period = bss->dtim_period;
935         else
936                 bss_conf->dtim_period = 0;
937
938         bss_conf->assoc = 1;
939         /*
940          * For now just always ask the driver to update the basic rateset
941          * when we have associated, we aren't checking whether it actually
942          * changed or not.
943          */
944         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
945
946         /* And the BSSID changed - we're associated now */
947         bss_info_changed |= BSS_CHANGED_BSSID;
948
949         /* Tell the driver to monitor connection quality (if supported) */
950         if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) &&
951             bss_conf->cqm_rssi_thold)
952                 bss_info_changed |= BSS_CHANGED_CQM;
953
954         /* Enable ARP filtering */
955         if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
956                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
957                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
958         }
959
960         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
961
962         mutex_lock(&local->iflist_mtx);
963         ieee80211_recalc_ps(local, -1);
964         ieee80211_recalc_smps(local);
965         mutex_unlock(&local->iflist_mtx);
966
967         netif_tx_start_all_queues(sdata->dev);
968         netif_carrier_on(sdata->dev);
969 }
970
971 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
972                                    bool remove_sta, bool tx)
973 {
974         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
975         struct ieee80211_local *local = sdata->local;
976         struct sta_info *sta;
977         u32 changed = 0, config_changed = 0;
978         u8 bssid[ETH_ALEN];
979
980         ASSERT_MGD_MTX(ifmgd);
981
982         if (WARN_ON(!ifmgd->associated))
983                 return;
984
985         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
986
987         ifmgd->associated = NULL;
988         memset(ifmgd->bssid, 0, ETH_ALEN);
989
990         /*
991          * we need to commit the associated = NULL change because the
992          * scan code uses that to determine whether this iface should
993          * go to/wake up from powersave or not -- and could otherwise
994          * wake the queues erroneously.
995          */
996         smp_mb();
997
998         /*
999          * Thus, we can only afterwards stop the queues -- to account
1000          * for the case where another CPU is finishing a scan at this
1001          * time -- we don't want the scan code to enable queues.
1002          */
1003
1004         netif_tx_stop_all_queues(sdata->dev);
1005         netif_carrier_off(sdata->dev);
1006
1007         mutex_lock(&local->sta_mtx);
1008         sta = sta_info_get(sdata, bssid);
1009         if (sta) {
1010                 set_sta_flags(sta, WLAN_STA_BLOCK_BA);
1011                 ieee80211_sta_tear_down_BA_sessions(sta, tx);
1012         }
1013         mutex_unlock(&local->sta_mtx);
1014
1015         changed |= ieee80211_reset_erp_info(sdata);
1016
1017         ieee80211_led_assoc(local, 0);
1018         changed |= BSS_CHANGED_ASSOC;
1019         sdata->vif.bss_conf.assoc = false;
1020
1021         ieee80211_set_wmm_default(sdata);
1022
1023         /* channel(_type) changes are handled by ieee80211_hw_config */
1024         WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
1025
1026         /* on the next assoc, re-program HT parameters */
1027         sdata->ht_opmode_valid = false;
1028
1029         local->power_constr_level = 0;
1030
1031         del_timer_sync(&local->dynamic_ps_timer);
1032         cancel_work_sync(&local->dynamic_ps_enable_work);
1033
1034         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1035                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1036                 config_changed |= IEEE80211_CONF_CHANGE_PS;
1037         }
1038
1039         ieee80211_hw_config(local, config_changed);
1040
1041         /* Disable ARP filtering */
1042         if (sdata->vif.bss_conf.arp_filter_enabled) {
1043                 sdata->vif.bss_conf.arp_filter_enabled = false;
1044                 changed |= BSS_CHANGED_ARP_FILTER;
1045         }
1046
1047         /* The BSSID (not really interesting) and HT changed */
1048         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1049         ieee80211_bss_info_change_notify(sdata, changed);
1050
1051         if (remove_sta)
1052                 sta_info_destroy_addr(sdata, bssid);
1053
1054         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1055         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1056         del_timer_sync(&sdata->u.mgd.timer);
1057         del_timer_sync(&sdata->u.mgd.chswitch_timer);
1058 }
1059
1060 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1061                              struct ieee80211_hdr *hdr)
1062 {
1063         /*
1064          * We can postpone the mgd.timer whenever receiving unicast frames
1065          * from AP because we know that the connection is working both ways
1066          * at that time. But multicast frames (and hence also beacons) must
1067          * be ignored here, because we need to trigger the timer during
1068          * data idle periods for sending the periodic probe request to the
1069          * AP we're connected to.
1070          */
1071         if (is_multicast_ether_addr(hdr->addr1))
1072                 return;
1073
1074         ieee80211_sta_reset_conn_monitor(sdata);
1075 }
1076
1077 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1078 {
1079         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1080
1081         if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1082                               IEEE80211_STA_CONNECTION_POLL)))
1083             return;
1084
1085         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1086                           IEEE80211_STA_BEACON_POLL);
1087         mutex_lock(&sdata->local->iflist_mtx);
1088         ieee80211_recalc_ps(sdata->local, -1);
1089         mutex_unlock(&sdata->local->iflist_mtx);
1090
1091         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1092                 return;
1093
1094         /*
1095          * We've received a probe response, but are not sure whether
1096          * we have or will be receiving any beacons or data, so let's
1097          * schedule the timers again, just in case.
1098          */
1099         ieee80211_sta_reset_beacon_monitor(sdata);
1100
1101         mod_timer(&ifmgd->conn_mon_timer,
1102                   round_jiffies_up(jiffies +
1103                                    IEEE80211_CONNECTION_IDLE_TIME));
1104 }
1105
1106 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1107                              struct ieee80211_hdr *hdr, bool ack)
1108 {
1109         if (!ieee80211_is_data(hdr->frame_control))
1110             return;
1111
1112         if (ack)
1113                 ieee80211_sta_reset_conn_monitor(sdata);
1114
1115         if (ieee80211_is_nullfunc(hdr->frame_control) &&
1116             sdata->u.mgd.probe_send_count > 0) {
1117                 if (ack)
1118                         sdata->u.mgd.probe_send_count = 0;
1119                 else
1120                         sdata->u.mgd.nullfunc_failed = true;
1121                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1122         }
1123 }
1124
1125 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1126 {
1127         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1128         const u8 *ssid;
1129         u8 *dst = ifmgd->associated->bssid;
1130         u8 unicast_limit = max(1, max_probe_tries - 3);
1131
1132         /*
1133          * Try sending broadcast probe requests for the last three
1134          * probe requests after the first ones failed since some
1135          * buggy APs only support broadcast probe requests.
1136          */
1137         if (ifmgd->probe_send_count >= unicast_limit)
1138                 dst = NULL;
1139
1140         /*
1141          * When the hardware reports an accurate Tx ACK status, it's
1142          * better to send a nullfunc frame instead of a probe request,
1143          * as it will kick us off the AP quickly if we aren't associated
1144          * anymore. The timeout will be reset if the frame is ACKed by
1145          * the AP.
1146          */
1147         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1148                 ifmgd->nullfunc_failed = false;
1149                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1150         } else {
1151                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1152                 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid[1], NULL, 0);
1153         }
1154
1155         ifmgd->probe_send_count++;
1156         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1157         run_again(ifmgd, ifmgd->probe_timeout);
1158 }
1159
1160 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1161                                    bool beacon)
1162 {
1163         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1164         bool already = false;
1165
1166         if (!ieee80211_sdata_running(sdata))
1167                 return;
1168
1169         if (sdata->local->scanning)
1170                 return;
1171
1172         if (sdata->local->tmp_channel)
1173                 return;
1174
1175         mutex_lock(&ifmgd->mtx);
1176
1177         if (!ifmgd->associated)
1178                 goto out;
1179
1180 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1181         if (beacon && net_ratelimit())
1182                 printk(KERN_DEBUG "%s: detected beacon loss from AP "
1183                        "- sending probe request\n", sdata->name);
1184 #endif
1185
1186         /*
1187          * The driver/our work has already reported this event or the
1188          * connection monitoring has kicked in and we have already sent
1189          * a probe request. Or maybe the AP died and the driver keeps
1190          * reporting until we disassociate...
1191          *
1192          * In either case we have to ignore the current call to this
1193          * function (except for setting the correct probe reason bit)
1194          * because otherwise we would reset the timer every time and
1195          * never check whether we received a probe response!
1196          */
1197         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1198                             IEEE80211_STA_CONNECTION_POLL))
1199                 already = true;
1200
1201         if (beacon)
1202                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1203         else
1204                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1205
1206         if (already)
1207                 goto out;
1208
1209         mutex_lock(&sdata->local->iflist_mtx);
1210         ieee80211_recalc_ps(sdata->local, -1);
1211         mutex_unlock(&sdata->local->iflist_mtx);
1212
1213         ifmgd->probe_send_count = 0;
1214         ieee80211_mgd_probe_ap_send(sdata);
1215  out:
1216         mutex_unlock(&ifmgd->mtx);
1217 }
1218
1219 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
1220                                           struct ieee80211_vif *vif)
1221 {
1222         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1223         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1224         struct sk_buff *skb;
1225         const u8 *ssid;
1226
1227         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1228                 return NULL;
1229
1230         ASSERT_MGD_MTX(ifmgd);
1231
1232         if (!ifmgd->associated)
1233                 return NULL;
1234
1235         ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1236         skb = ieee80211_build_probe_req(sdata, ifmgd->associated->bssid,
1237                                         ssid + 2, ssid[1], NULL, 0);
1238
1239         return skb;
1240 }
1241 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
1242
1243 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
1244 {
1245         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1246         struct ieee80211_local *local = sdata->local;
1247         u8 bssid[ETH_ALEN];
1248
1249         mutex_lock(&ifmgd->mtx);
1250         if (!ifmgd->associated) {
1251                 mutex_unlock(&ifmgd->mtx);
1252                 return;
1253         }
1254
1255         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1256
1257         printk(KERN_DEBUG "%s: Connection to AP %pM lost.\n",
1258                sdata->name, bssid);
1259
1260         ieee80211_set_disassoc(sdata, true, true);
1261         mutex_unlock(&ifmgd->mtx);
1262
1263         mutex_lock(&local->mtx);
1264         ieee80211_recalc_idle(local);
1265         mutex_unlock(&local->mtx);
1266         /*
1267          * must be outside lock due to cfg80211,
1268          * but that's not a problem.
1269          */
1270         ieee80211_send_deauth_disassoc(sdata, bssid,
1271                                        IEEE80211_STYPE_DEAUTH,
1272                                        WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1273                                        NULL, true);
1274 }
1275
1276 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1277 {
1278         struct ieee80211_sub_if_data *sdata =
1279                 container_of(work, struct ieee80211_sub_if_data,
1280                              u.mgd.beacon_connection_loss_work);
1281
1282         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1283                 __ieee80211_connection_loss(sdata);
1284         else
1285                 ieee80211_mgd_probe_ap(sdata, true);
1286 }
1287
1288 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1289 {
1290         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1291         struct ieee80211_hw *hw = &sdata->local->hw;
1292
1293         trace_api_beacon_loss(sdata);
1294
1295         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1296         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1297 }
1298 EXPORT_SYMBOL(ieee80211_beacon_loss);
1299
1300 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1301 {
1302         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1303         struct ieee80211_hw *hw = &sdata->local->hw;
1304
1305         trace_api_connection_loss(sdata);
1306
1307         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1308         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1309 }
1310 EXPORT_SYMBOL(ieee80211_connection_loss);
1311
1312
1313 static enum rx_mgmt_action __must_check
1314 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1315                          struct ieee80211_mgmt *mgmt, size_t len)
1316 {
1317         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1318         const u8 *bssid = NULL;
1319         u16 reason_code;
1320
1321         if (len < 24 + 2)
1322                 return RX_MGMT_NONE;
1323
1324         ASSERT_MGD_MTX(ifmgd);
1325
1326         bssid = ifmgd->associated->bssid;
1327
1328         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1329
1330         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1331                         sdata->name, bssid, reason_code);
1332
1333         ieee80211_set_disassoc(sdata, true, false);
1334         mutex_lock(&sdata->local->mtx);
1335         ieee80211_recalc_idle(sdata->local);
1336         mutex_unlock(&sdata->local->mtx);
1337
1338         return RX_MGMT_CFG80211_DEAUTH;
1339 }
1340
1341
1342 static enum rx_mgmt_action __must_check
1343 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1344                            struct ieee80211_mgmt *mgmt, size_t len)
1345 {
1346         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1347         u16 reason_code;
1348
1349         if (len < 24 + 2)
1350                 return RX_MGMT_NONE;
1351
1352         ASSERT_MGD_MTX(ifmgd);
1353
1354         if (WARN_ON(!ifmgd->associated))
1355                 return RX_MGMT_NONE;
1356
1357         if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
1358                 return RX_MGMT_NONE;
1359
1360         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1361
1362         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1363                         sdata->name, mgmt->sa, reason_code);
1364
1365         ieee80211_set_disassoc(sdata, true, false);
1366         mutex_lock(&sdata->local->mtx);
1367         ieee80211_recalc_idle(sdata->local);
1368         mutex_unlock(&sdata->local->mtx);
1369         return RX_MGMT_CFG80211_DISASSOC;
1370 }
1371
1372
1373 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1374                                     struct ieee80211_mgmt *mgmt, size_t len)
1375 {
1376         struct ieee80211_sub_if_data *sdata = wk->sdata;
1377         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1378         struct ieee80211_local *local = sdata->local;
1379         struct ieee80211_supported_band *sband;
1380         struct sta_info *sta;
1381         struct cfg80211_bss *cbss = wk->assoc.bss;
1382         u8 *pos;
1383         u32 rates, basic_rates;
1384         u16 capab_info, aid;
1385         struct ieee802_11_elems elems;
1386         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1387         u32 changed = 0;
1388         int i, j, err;
1389         bool have_higher_than_11mbit = false;
1390         u16 ap_ht_cap_flags;
1391
1392         /* AssocResp and ReassocResp have identical structure */
1393
1394         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1395         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1396
1397         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1398                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1399                        "set\n", sdata->name, aid);
1400         aid &= ~(BIT(15) | BIT(14));
1401
1402         pos = mgmt->u.assoc_resp.variable;
1403         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1404
1405         if (!elems.supp_rates) {
1406                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1407                        sdata->name);
1408                 return false;
1409         }
1410
1411         ifmgd->aid = aid;
1412
1413         sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1414         if (!sta) {
1415                 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1416                        " the AP\n", sdata->name);
1417                 return false;
1418         }
1419
1420         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1421                            WLAN_STA_ASSOC_AP);
1422         if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1423                 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1424
1425         rates = 0;
1426         basic_rates = 0;
1427         sband = local->hw.wiphy->bands[wk->chan->band];
1428
1429         for (i = 0; i < elems.supp_rates_len; i++) {
1430                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1431                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1432
1433                 if (rate > 110)
1434                         have_higher_than_11mbit = true;
1435
1436                 for (j = 0; j < sband->n_bitrates; j++) {
1437                         if (sband->bitrates[j].bitrate == rate) {
1438                                 rates |= BIT(j);
1439                                 if (is_basic)
1440                                         basic_rates |= BIT(j);
1441                                 break;
1442                         }
1443                 }
1444         }
1445
1446         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1447                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1448                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1449
1450                 if (rate > 110)
1451                         have_higher_than_11mbit = true;
1452
1453                 for (j = 0; j < sband->n_bitrates; j++) {
1454                         if (sband->bitrates[j].bitrate == rate) {
1455                                 rates |= BIT(j);
1456                                 if (is_basic)
1457                                         basic_rates |= BIT(j);
1458                                 break;
1459                         }
1460                 }
1461         }
1462
1463         sta->sta.supp_rates[wk->chan->band] = rates;
1464         sdata->vif.bss_conf.basic_rates = basic_rates;
1465
1466         /* cf. IEEE 802.11 9.2.12 */
1467         if (wk->chan->band == IEEE80211_BAND_2GHZ &&
1468             have_higher_than_11mbit)
1469                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1470         else
1471                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1472
1473         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1474                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1475                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1476
1477         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1478
1479         rate_control_rate_init(sta);
1480
1481         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1482                 set_sta_flags(sta, WLAN_STA_MFP);
1483
1484         if (elems.wmm_param)
1485                 set_sta_flags(sta, WLAN_STA_WME);
1486
1487         err = sta_info_insert(sta);
1488         sta = NULL;
1489         if (err) {
1490                 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1491                        " the AP (error %d)\n", sdata->name, err);
1492                 return false;
1493         }
1494
1495         /*
1496          * Always handle WMM once after association regardless
1497          * of the first value the AP uses. Setting -1 here has
1498          * that effect because the AP values is an unsigned
1499          * 4-bit value.
1500          */
1501         ifmgd->wmm_last_param_set = -1;
1502
1503         if (elems.wmm_param)
1504                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1505                                          elems.wmm_param_len);
1506         else
1507                 ieee80211_set_wmm_default(sdata);
1508
1509         local->oper_channel = wk->chan;
1510
1511         if (elems.ht_info_elem && elems.wmm_param &&
1512             (sdata->local->hw.queues >= 4) &&
1513             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1514                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1515                                                cbss->bssid, ap_ht_cap_flags);
1516
1517         /* set AID and assoc capability,
1518          * ieee80211_set_associated() will tell the driver */
1519         bss_conf->aid = aid;
1520         bss_conf->assoc_capability = capab_info;
1521         ieee80211_set_associated(sdata, cbss, changed);
1522
1523         /*
1524          * If we're using 4-addr mode, let the AP know that we're
1525          * doing so, so that it can create the STA VLAN on its side
1526          */
1527         if (ifmgd->use_4addr)
1528                 ieee80211_send_4addr_nullfunc(local, sdata);
1529
1530         /*
1531          * Start timer to probe the connection to the AP now.
1532          * Also start the timer that will detect beacon loss.
1533          */
1534         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1535         ieee80211_sta_reset_beacon_monitor(sdata);
1536
1537         return true;
1538 }
1539
1540
1541 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1542                                   struct ieee80211_mgmt *mgmt,
1543                                   size_t len,
1544                                   struct ieee80211_rx_status *rx_status,
1545                                   struct ieee802_11_elems *elems,
1546                                   bool beacon)
1547 {
1548         struct ieee80211_local *local = sdata->local;
1549         int freq;
1550         struct ieee80211_bss *bss;
1551         struct ieee80211_channel *channel;
1552         bool need_ps = false;
1553
1554         if (sdata->u.mgd.associated) {
1555                 bss = (void *)sdata->u.mgd.associated->priv;
1556                 /* not previously set so we may need to recalc */
1557                 need_ps = !bss->dtim_period;
1558         }
1559
1560         if (elems->ds_params && elems->ds_params_len == 1)
1561                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
1562                                                       rx_status->band);
1563         else
1564                 freq = rx_status->freq;
1565
1566         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1567
1568         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1569                 return;
1570
1571         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1572                                         channel, beacon);
1573         if (bss)
1574                 ieee80211_rx_bss_put(local, bss);
1575
1576         if (!sdata->u.mgd.associated)
1577                 return;
1578
1579         if (need_ps) {
1580                 mutex_lock(&local->iflist_mtx);
1581                 ieee80211_recalc_ps(local, -1);
1582                 mutex_unlock(&local->iflist_mtx);
1583         }
1584
1585         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1586             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1587                                                         ETH_ALEN) == 0)) {
1588                 struct ieee80211_channel_sw_ie *sw_elem =
1589                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1590                 ieee80211_sta_process_chanswitch(sdata, sw_elem,
1591                                                  bss, rx_status->mactime);
1592         }
1593 }
1594
1595
1596 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1597                                          struct sk_buff *skb)
1598 {
1599         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1600         struct ieee80211_if_managed *ifmgd;
1601         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1602         size_t baselen, len = skb->len;
1603         struct ieee802_11_elems elems;
1604
1605         ifmgd = &sdata->u.mgd;
1606
1607         ASSERT_MGD_MTX(ifmgd);
1608
1609         if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1610                 return; /* ignore ProbeResp to foreign address */
1611
1612         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1613         if (baselen > len)
1614                 return;
1615
1616         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1617                                 &elems);
1618
1619         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1620
1621         if (ifmgd->associated &&
1622             memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0)
1623                 ieee80211_reset_ap_probe(sdata);
1624 }
1625
1626 /*
1627  * This is the canonical list of information elements we care about,
1628  * the filter code also gives us all changes to the Microsoft OUI
1629  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1630  *
1631  * We implement beacon filtering in software since that means we can
1632  * avoid processing the frame here and in cfg80211, and userspace
1633  * will not be able to tell whether the hardware supports it or not.
1634  *
1635  * XXX: This list needs to be dynamic -- userspace needs to be able to
1636  *      add items it requires. It also needs to be able to tell us to
1637  *      look out for other vendor IEs.
1638  */
1639 static const u64 care_about_ies =
1640         (1ULL << WLAN_EID_COUNTRY) |
1641         (1ULL << WLAN_EID_ERP_INFO) |
1642         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1643         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1644         (1ULL << WLAN_EID_HT_CAPABILITY) |
1645         (1ULL << WLAN_EID_HT_INFORMATION);
1646
1647 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1648                                      struct ieee80211_mgmt *mgmt,
1649                                      size_t len,
1650                                      struct ieee80211_rx_status *rx_status)
1651 {
1652         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1653         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1654         size_t baselen;
1655         struct ieee802_11_elems elems;
1656         struct ieee80211_local *local = sdata->local;
1657         u32 changed = 0;
1658         bool erp_valid, directed_tim = false;
1659         u8 erp_value = 0;
1660         u32 ncrc;
1661         u8 *bssid;
1662
1663         ASSERT_MGD_MTX(ifmgd);
1664
1665         /* Process beacon from the current BSS */
1666         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1667         if (baselen > len)
1668                 return;
1669
1670         if (rx_status->freq != local->hw.conf.channel->center_freq)
1671                 return;
1672
1673         /*
1674          * We might have received a number of frames, among them a
1675          * disassoc frame and a beacon...
1676          */
1677         if (!ifmgd->associated)
1678                 return;
1679
1680         bssid = ifmgd->associated->bssid;
1681
1682         /*
1683          * And in theory even frames from a different AP we were just
1684          * associated to a split-second ago!
1685          */
1686         if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1687                 return;
1688
1689         /* Track average RSSI from the Beacon frames of the current AP */
1690         ifmgd->last_beacon_signal = rx_status->signal;
1691         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
1692                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
1693                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
1694                 ifmgd->last_cqm_event_signal = 0;
1695                 ifmgd->count_beacon_signal = 1;
1696         } else {
1697                 ifmgd->ave_beacon_signal =
1698                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
1699                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
1700                          ifmgd->ave_beacon_signal) / 16;
1701                 ifmgd->count_beacon_signal++;
1702         }
1703         if (bss_conf->cqm_rssi_thold &&
1704             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
1705             !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) {
1706                 int sig = ifmgd->ave_beacon_signal / 16;
1707                 int last_event = ifmgd->last_cqm_event_signal;
1708                 int thold = bss_conf->cqm_rssi_thold;
1709                 int hyst = bss_conf->cqm_rssi_hyst;
1710                 if (sig < thold &&
1711                     (last_event == 0 || sig < last_event - hyst)) {
1712                         ifmgd->last_cqm_event_signal = sig;
1713                         ieee80211_cqm_rssi_notify(
1714                                 &sdata->vif,
1715                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
1716                                 GFP_KERNEL);
1717                 } else if (sig > thold &&
1718                            (last_event == 0 || sig > last_event + hyst)) {
1719                         ifmgd->last_cqm_event_signal = sig;
1720                         ieee80211_cqm_rssi_notify(
1721                                 &sdata->vif,
1722                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
1723                                 GFP_KERNEL);
1724                 }
1725         }
1726
1727         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1728 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1729                 if (net_ratelimit()) {
1730                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1731                                "to a received beacon\n", sdata->name);
1732                 }
1733 #endif
1734                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1735                 mutex_lock(&local->iflist_mtx);
1736                 ieee80211_recalc_ps(local, -1);
1737                 mutex_unlock(&local->iflist_mtx);
1738         }
1739
1740         /*
1741          * Push the beacon loss detection into the future since
1742          * we are processing a beacon from the AP just now.
1743          */
1744         ieee80211_sta_reset_beacon_monitor(sdata);
1745
1746         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1747         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1748                                           len - baselen, &elems,
1749                                           care_about_ies, ncrc);
1750
1751         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1752                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1753                                                    ifmgd->aid);
1754
1755         if (ncrc != ifmgd->beacon_crc || !ifmgd->beacon_crc_valid) {
1756                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1757                                       true);
1758
1759                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1760                                          elems.wmm_param_len);
1761         }
1762
1763         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1764                 if (directed_tim) {
1765                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1766                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1767                                 ieee80211_hw_config(local,
1768                                                     IEEE80211_CONF_CHANGE_PS);
1769                                 ieee80211_send_nullfunc(local, sdata, 0);
1770                         } else {
1771                                 local->pspolling = true;
1772
1773                                 /*
1774                                  * Here is assumed that the driver will be
1775                                  * able to send ps-poll frame and receive a
1776                                  * response even though power save mode is
1777                                  * enabled, but some drivers might require
1778                                  * to disable power save here. This needs
1779                                  * to be investigated.
1780                                  */
1781                                 ieee80211_send_pspoll(local, sdata);
1782                         }
1783                 }
1784         }
1785
1786         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
1787                 return;
1788         ifmgd->beacon_crc = ncrc;
1789         ifmgd->beacon_crc_valid = true;
1790
1791         if (elems.erp_info && elems.erp_info_len >= 1) {
1792                 erp_valid = true;
1793                 erp_value = elems.erp_info[0];
1794         } else {
1795                 erp_valid = false;
1796         }
1797         changed |= ieee80211_handle_bss_capability(sdata,
1798                         le16_to_cpu(mgmt->u.beacon.capab_info),
1799                         erp_valid, erp_value);
1800
1801
1802         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1803             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1804                 struct sta_info *sta;
1805                 struct ieee80211_supported_band *sband;
1806                 u16 ap_ht_cap_flags;
1807
1808                 rcu_read_lock();
1809
1810                 sta = sta_info_get(sdata, bssid);
1811                 if (WARN_ON(!sta)) {
1812                         rcu_read_unlock();
1813                         return;
1814                 }
1815
1816                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1817
1818                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1819                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1820
1821                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1822
1823                 rcu_read_unlock();
1824
1825                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1826                                                bssid, ap_ht_cap_flags);
1827         }
1828
1829         /* Note: country IE parsing is done for us by cfg80211 */
1830         if (elems.country_elem) {
1831                 /* TODO: IBSS also needs this */
1832                 if (elems.pwr_constr_elem)
1833                         ieee80211_handle_pwr_constr(sdata,
1834                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1835                                 elems.pwr_constr_elem,
1836                                 elems.pwr_constr_elem_len);
1837         }
1838
1839         ieee80211_bss_info_change_notify(sdata, changed);
1840 }
1841
1842 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1843                                   struct sk_buff *skb)
1844 {
1845         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1846         struct ieee80211_rx_status *rx_status;
1847         struct ieee80211_mgmt *mgmt;
1848         enum rx_mgmt_action rma = RX_MGMT_NONE;
1849         u16 fc;
1850
1851         rx_status = (struct ieee80211_rx_status *) skb->cb;
1852         mgmt = (struct ieee80211_mgmt *) skb->data;
1853         fc = le16_to_cpu(mgmt->frame_control);
1854
1855         mutex_lock(&ifmgd->mtx);
1856
1857         if (ifmgd->associated &&
1858             memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1859                 switch (fc & IEEE80211_FCTL_STYPE) {
1860                 case IEEE80211_STYPE_BEACON:
1861                         ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1862                                                  rx_status);
1863                         break;
1864                 case IEEE80211_STYPE_PROBE_RESP:
1865                         ieee80211_rx_mgmt_probe_resp(sdata, skb);
1866                         break;
1867                 case IEEE80211_STYPE_DEAUTH:
1868                         rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1869                         break;
1870                 case IEEE80211_STYPE_DISASSOC:
1871                         rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1872                         break;
1873                 case IEEE80211_STYPE_ACTION:
1874                         switch (mgmt->u.action.category) {
1875                         case WLAN_CATEGORY_SPECTRUM_MGMT:
1876                                 ieee80211_sta_process_chanswitch(sdata,
1877                                                 &mgmt->u.action.u.chan_switch.sw_elem,
1878                                                 (void *)ifmgd->associated->priv,
1879                                                 rx_status->mactime);
1880                                 break;
1881                         }
1882                 }
1883                 mutex_unlock(&ifmgd->mtx);
1884
1885                 switch (rma) {
1886                 case RX_MGMT_NONE:
1887                         /* no action */
1888                         break;
1889                 case RX_MGMT_CFG80211_DEAUTH:
1890                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1891                         break;
1892                 case RX_MGMT_CFG80211_DISASSOC:
1893                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1894                         break;
1895                 default:
1896                         WARN(1, "unexpected: %d", rma);
1897                 }
1898                 return;
1899         }
1900
1901         mutex_unlock(&ifmgd->mtx);
1902
1903         if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1904             (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH) {
1905                 struct ieee80211_local *local = sdata->local;
1906                 struct ieee80211_work *wk;
1907
1908                 mutex_lock(&local->mtx);
1909                 list_for_each_entry(wk, &local->work_list, list) {
1910                         if (wk->sdata != sdata)
1911                                 continue;
1912
1913                         if (wk->type != IEEE80211_WORK_ASSOC &&
1914                             wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
1915                                 continue;
1916
1917                         if (memcmp(mgmt->bssid, wk->filter_ta, ETH_ALEN))
1918                                 continue;
1919                         if (memcmp(mgmt->sa, wk->filter_ta, ETH_ALEN))
1920                                 continue;
1921
1922                         /*
1923                          * Printing the message only here means we can't
1924                          * spuriously print it, but it also means that it
1925                          * won't be printed when the frame comes in before
1926                          * we even tried to associate or in similar cases.
1927                          *
1928                          * Ultimately, I suspect cfg80211 should print the
1929                          * messages instead.
1930                          */
1931                         printk(KERN_DEBUG
1932                                "%s: deauthenticated from %pM (Reason: %u)\n",
1933                                sdata->name, mgmt->bssid,
1934                                le16_to_cpu(mgmt->u.deauth.reason_code));
1935
1936                         list_del_rcu(&wk->list);
1937                         free_work(wk);
1938                         break;
1939                 }
1940                 mutex_unlock(&local->mtx);
1941
1942                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1943         }
1944 }
1945
1946 static void ieee80211_sta_timer(unsigned long data)
1947 {
1948         struct ieee80211_sub_if_data *sdata =
1949                 (struct ieee80211_sub_if_data *) data;
1950         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1951         struct ieee80211_local *local = sdata->local;
1952
1953         if (local->quiescing) {
1954                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1955                 return;
1956         }
1957
1958         ieee80211_queue_work(&local->hw, &sdata->work);
1959 }
1960
1961 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
1962                                           u8 *bssid)
1963 {
1964         struct ieee80211_local *local = sdata->local;
1965         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1966
1967         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1968                           IEEE80211_STA_BEACON_POLL);
1969
1970         ieee80211_set_disassoc(sdata, true, true);
1971         mutex_unlock(&ifmgd->mtx);
1972         mutex_lock(&local->mtx);
1973         ieee80211_recalc_idle(local);
1974         mutex_unlock(&local->mtx);
1975         /*
1976          * must be outside lock due to cfg80211,
1977          * but that's not a problem.
1978          */
1979         ieee80211_send_deauth_disassoc(sdata, bssid,
1980                         IEEE80211_STYPE_DEAUTH,
1981                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1982                         NULL, true);
1983         mutex_lock(&ifmgd->mtx);
1984 }
1985
1986 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
1987 {
1988         struct ieee80211_local *local = sdata->local;
1989         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1990
1991         /* then process the rest of the work */
1992         mutex_lock(&ifmgd->mtx);
1993
1994         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1995                             IEEE80211_STA_CONNECTION_POLL) &&
1996             ifmgd->associated) {
1997                 u8 bssid[ETH_ALEN];
1998                 int max_tries;
1999
2000                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
2001
2002                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2003                         max_tries = max_nullfunc_tries;
2004                 else
2005                         max_tries = max_probe_tries;
2006
2007                 /* ACK received for nullfunc probing frame */
2008                 if (!ifmgd->probe_send_count)
2009                         ieee80211_reset_ap_probe(sdata);
2010                 else if (ifmgd->nullfunc_failed) {
2011                         if (ifmgd->probe_send_count < max_tries) {
2012 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2013                                 wiphy_debug(local->hw.wiphy,
2014                                             "%s: No ack for nullfunc frame to"
2015                                             " AP %pM, try %d/%i\n",
2016                                             sdata->name, bssid,
2017                                             ifmgd->probe_send_count, max_tries);
2018 #endif
2019                                 ieee80211_mgd_probe_ap_send(sdata);
2020                         } else {
2021 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2022                                 wiphy_debug(local->hw.wiphy,
2023                                             "%s: No ack for nullfunc frame to"
2024                                             " AP %pM, disconnecting.\n",
2025                                             sdata->name, bssid);
2026 #endif
2027                                 ieee80211_sta_connection_lost(sdata, bssid);
2028                         }
2029                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
2030                         run_again(ifmgd, ifmgd->probe_timeout);
2031                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2032 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2033                         wiphy_debug(local->hw.wiphy,
2034                                     "%s: Failed to send nullfunc to AP %pM"
2035                                     " after %dms, disconnecting.\n",
2036                                     sdata->name,
2037                                     bssid, probe_wait_ms);
2038 #endif
2039                         ieee80211_sta_connection_lost(sdata, bssid);
2040                 } else if (ifmgd->probe_send_count < max_tries) {
2041 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2042                         wiphy_debug(local->hw.wiphy,
2043                                     "%s: No probe response from AP %pM"
2044                                     " after %dms, try %d/%i\n",
2045                                     sdata->name,
2046                                     bssid, probe_wait_ms,
2047                                     ifmgd->probe_send_count, max_tries);
2048 #endif
2049                         ieee80211_mgd_probe_ap_send(sdata);
2050                 } else {
2051                         /*
2052                          * We actually lost the connection ... or did we?
2053                          * Let's make sure!
2054                          */
2055                         wiphy_debug(local->hw.wiphy,
2056                                     "%s: No probe response from AP %pM"
2057                                     " after %dms, disconnecting.\n",
2058                                     sdata->name,
2059                                     bssid, probe_wait_ms);
2060
2061                         ieee80211_sta_connection_lost(sdata, bssid);
2062                 }
2063         }
2064
2065         mutex_unlock(&ifmgd->mtx);
2066 }
2067
2068 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
2069 {
2070         struct ieee80211_sub_if_data *sdata =
2071                 (struct ieee80211_sub_if_data *) data;
2072         struct ieee80211_local *local = sdata->local;
2073
2074         if (local->quiescing)
2075                 return;
2076
2077         ieee80211_queue_work(&sdata->local->hw,
2078                              &sdata->u.mgd.beacon_connection_loss_work);
2079 }
2080
2081 static void ieee80211_sta_conn_mon_timer(unsigned long data)
2082 {
2083         struct ieee80211_sub_if_data *sdata =
2084                 (struct ieee80211_sub_if_data *) data;
2085         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2086         struct ieee80211_local *local = sdata->local;
2087
2088         if (local->quiescing)
2089                 return;
2090
2091         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
2092 }
2093
2094 static void ieee80211_sta_monitor_work(struct work_struct *work)
2095 {
2096         struct ieee80211_sub_if_data *sdata =
2097                 container_of(work, struct ieee80211_sub_if_data,
2098                              u.mgd.monitor_work);
2099
2100         ieee80211_mgd_probe_ap(sdata, false);
2101 }
2102
2103 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2104 {
2105         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2106                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
2107                                         IEEE80211_STA_CONNECTION_POLL);
2108
2109                 /* let's probe the connection once */
2110                 ieee80211_queue_work(&sdata->local->hw,
2111                            &sdata->u.mgd.monitor_work);
2112                 /* and do all the other regular work too */
2113                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2114         }
2115 }
2116
2117 #ifdef CONFIG_PM
2118 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2119 {
2120         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2121
2122         /*
2123          * we need to use atomic bitops for the running bits
2124          * only because both timers might fire at the same
2125          * time -- the code here is properly synchronised.
2126          */
2127
2128         cancel_work_sync(&ifmgd->request_smps_work);
2129
2130         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
2131         if (del_timer_sync(&ifmgd->timer))
2132                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2133
2134         cancel_work_sync(&ifmgd->chswitch_work);
2135         if (del_timer_sync(&ifmgd->chswitch_timer))
2136                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2137
2138         cancel_work_sync(&ifmgd->monitor_work);
2139         /* these will just be re-established on connection */
2140         del_timer_sync(&ifmgd->conn_mon_timer);
2141         del_timer_sync(&ifmgd->bcn_mon_timer);
2142 }
2143
2144 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2145 {
2146         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2147
2148         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2149                 add_timer(&ifmgd->timer);
2150         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2151                 add_timer(&ifmgd->chswitch_timer);
2152         ieee80211_sta_reset_beacon_monitor(sdata);
2153         ieee80211_restart_sta_timer(sdata);
2154 }
2155 #endif
2156
2157 /* interface setup */
2158 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2159 {
2160         struct ieee80211_if_managed *ifmgd;
2161
2162         ifmgd = &sdata->u.mgd;
2163         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
2164         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2165         INIT_WORK(&ifmgd->beacon_connection_loss_work,
2166                   ieee80211_beacon_connection_loss_work);
2167         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
2168         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2169                     (unsigned long) sdata);
2170         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
2171                     (unsigned long) sdata);
2172         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
2173                     (unsigned long) sdata);
2174         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2175                     (unsigned long) sdata);
2176
2177         ifmgd->flags = 0;
2178
2179         mutex_init(&ifmgd->mtx);
2180
2181         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
2182                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
2183         else
2184                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
2185 }
2186
2187 /* scan finished notification */
2188 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2189 {
2190         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2191
2192         /* Restart STA timers */
2193         rcu_read_lock();
2194         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2195                 ieee80211_restart_sta_timer(sdata);
2196         rcu_read_unlock();
2197 }
2198
2199 int ieee80211_max_network_latency(struct notifier_block *nb,
2200                                   unsigned long data, void *dummy)
2201 {
2202         s32 latency_usec = (s32) data;
2203         struct ieee80211_local *local =
2204                 container_of(nb, struct ieee80211_local,
2205                              network_latency_notifier);
2206
2207         mutex_lock(&local->iflist_mtx);
2208         ieee80211_recalc_ps(local, latency_usec);
2209         mutex_unlock(&local->iflist_mtx);
2210
2211         return 0;
2212 }
2213
2214 /* config hooks */
2215 static enum work_done_result
2216 ieee80211_probe_auth_done(struct ieee80211_work *wk,
2217                           struct sk_buff *skb)
2218 {
2219         if (!skb) {
2220                 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
2221                 return WORK_DONE_DESTROY;
2222         }
2223
2224         if (wk->type == IEEE80211_WORK_AUTH) {
2225                 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
2226                 return WORK_DONE_DESTROY;
2227         }
2228
2229         mutex_lock(&wk->sdata->u.mgd.mtx);
2230         ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
2231         mutex_unlock(&wk->sdata->u.mgd.mtx);
2232
2233         wk->type = IEEE80211_WORK_AUTH;
2234         wk->probe_auth.tries = 0;
2235         return WORK_DONE_REQUEUE;
2236 }
2237
2238 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
2239                        struct cfg80211_auth_request *req)
2240 {
2241         const u8 *ssid;
2242         struct ieee80211_work *wk;
2243         u16 auth_alg;
2244
2245         if (req->local_state_change)
2246                 return 0; /* no need to update mac80211 state */
2247
2248         switch (req->auth_type) {
2249         case NL80211_AUTHTYPE_OPEN_SYSTEM:
2250                 auth_alg = WLAN_AUTH_OPEN;
2251                 break;
2252         case NL80211_AUTHTYPE_SHARED_KEY:
2253                 if (IS_ERR(sdata->local->wep_tx_tfm))
2254                         return -EOPNOTSUPP;
2255                 auth_alg = WLAN_AUTH_SHARED_KEY;
2256                 break;
2257         case NL80211_AUTHTYPE_FT:
2258                 auth_alg = WLAN_AUTH_FT;
2259                 break;
2260         case NL80211_AUTHTYPE_NETWORK_EAP:
2261                 auth_alg = WLAN_AUTH_LEAP;
2262                 break;
2263         default:
2264                 return -EOPNOTSUPP;
2265         }
2266
2267         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2268         if (!wk)
2269                 return -ENOMEM;
2270
2271         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2272
2273         if (req->ie && req->ie_len) {
2274                 memcpy(wk->ie, req->ie, req->ie_len);
2275                 wk->ie_len = req->ie_len;
2276         }
2277
2278         if (req->key && req->key_len) {
2279                 wk->probe_auth.key_len = req->key_len;
2280                 wk->probe_auth.key_idx = req->key_idx;
2281                 memcpy(wk->probe_auth.key, req->key, req->key_len);
2282         }
2283
2284         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2285         memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
2286         wk->probe_auth.ssid_len = ssid[1];
2287
2288         wk->probe_auth.algorithm = auth_alg;
2289         wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
2290
2291         /* if we already have a probe, don't probe again */
2292         if (req->bss->proberesp_ies)
2293                 wk->type = IEEE80211_WORK_AUTH;
2294         else
2295                 wk->type = IEEE80211_WORK_DIRECT_PROBE;
2296         wk->chan = req->bss->channel;
2297         wk->chan_type = NL80211_CHAN_NO_HT;
2298         wk->sdata = sdata;
2299         wk->done = ieee80211_probe_auth_done;
2300
2301         ieee80211_add_work(wk);
2302         return 0;
2303 }
2304
2305 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
2306                                                   struct sk_buff *skb)
2307 {
2308         struct ieee80211_mgmt *mgmt;
2309         struct ieee80211_rx_status *rx_status;
2310         struct ieee802_11_elems elems;
2311         u16 status;
2312
2313         if (!skb) {
2314                 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
2315                 return WORK_DONE_DESTROY;
2316         }
2317
2318         if (wk->type == IEEE80211_WORK_ASSOC_BEACON_WAIT) {
2319                 mutex_lock(&wk->sdata->u.mgd.mtx);
2320                 rx_status = (void *) skb->cb;
2321                 ieee802_11_parse_elems(skb->data + 24 + 12, skb->len - 24 - 12, &elems);
2322                 ieee80211_rx_bss_info(wk->sdata, (void *)skb->data, skb->len, rx_status,
2323                                       &elems, true);
2324                 mutex_unlock(&wk->sdata->u.mgd.mtx);
2325
2326                 wk->type = IEEE80211_WORK_ASSOC;
2327                 /* not really done yet */
2328                 return WORK_DONE_REQUEUE;
2329         }
2330
2331         mgmt = (void *)skb->data;
2332         status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2333
2334         if (status == WLAN_STATUS_SUCCESS) {
2335                 mutex_lock(&wk->sdata->u.mgd.mtx);
2336                 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
2337                         mutex_unlock(&wk->sdata->u.mgd.mtx);
2338                         /* oops -- internal error -- send timeout for now */
2339                         cfg80211_send_assoc_timeout(wk->sdata->dev,
2340                                                     wk->filter_ta);
2341                         return WORK_DONE_DESTROY;
2342                 }
2343
2344                 mutex_unlock(&wk->sdata->u.mgd.mtx);
2345         }
2346
2347         cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
2348         return WORK_DONE_DESTROY;
2349 }
2350
2351 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2352                         struct cfg80211_assoc_request *req)
2353 {
2354         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2355         struct ieee80211_bss *bss = (void *)req->bss->priv;
2356         struct ieee80211_work *wk;
2357         const u8 *ssid;
2358         int i;
2359
2360         mutex_lock(&ifmgd->mtx);
2361         if (ifmgd->associated) {
2362                 if (!req->prev_bssid ||
2363                     memcmp(req->prev_bssid, ifmgd->associated->bssid,
2364                            ETH_ALEN)) {
2365                         /*
2366                          * We are already associated and the request was not a
2367                          * reassociation request from the current BSS, so
2368                          * reject it.
2369                          */
2370                         mutex_unlock(&ifmgd->mtx);
2371                         return -EALREADY;
2372                 }
2373
2374                 /* Trying to reassociate - clear previous association state */
2375                 ieee80211_set_disassoc(sdata, true, false);
2376         }
2377         mutex_unlock(&ifmgd->mtx);
2378
2379         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2380         if (!wk)
2381                 return -ENOMEM;
2382
2383         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2384         ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
2385
2386         ifmgd->beacon_crc_valid = false;
2387
2388         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2389                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2390                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2391                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2392                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2393
2394
2395         if (req->ie && req->ie_len) {
2396                 memcpy(wk->ie, req->ie, req->ie_len);
2397                 wk->ie_len = req->ie_len;
2398         } else
2399                 wk->ie_len = 0;
2400
2401         wk->assoc.bss = req->bss;
2402
2403         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2404
2405         /* new association always uses requested smps mode */
2406         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
2407                 if (ifmgd->powersave)
2408                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
2409                 else
2410                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
2411         } else
2412                 ifmgd->ap_smps = ifmgd->req_smps;
2413
2414         wk->assoc.smps = ifmgd->ap_smps;
2415         /*
2416          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
2417          * We still associate in non-HT mode (11a/b/g) if any one of these
2418          * ciphers is configured as pairwise.
2419          * We can set this to true for non-11n hardware, that'll be checked
2420          * separately along with the peer capabilities.
2421          */
2422         wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
2423         wk->assoc.capability = req->bss->capability;
2424         wk->assoc.wmm_used = bss->wmm_used;
2425         wk->assoc.supp_rates = bss->supp_rates;
2426         wk->assoc.supp_rates_len = bss->supp_rates_len;
2427         wk->assoc.ht_information_ie =
2428                 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
2429
2430         if (bss->wmm_used && bss->uapsd_supported &&
2431             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
2432                 wk->assoc.uapsd_used = true;
2433                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
2434         } else {
2435                 wk->assoc.uapsd_used = false;
2436                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
2437         }
2438
2439         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2440         memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
2441         wk->assoc.ssid_len = ssid[1];
2442
2443         if (req->prev_bssid)
2444                 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
2445
2446         wk->chan = req->bss->channel;
2447         wk->chan_type = NL80211_CHAN_NO_HT;
2448         wk->sdata = sdata;
2449         wk->done = ieee80211_assoc_done;
2450         if (!bss->dtim_period &&
2451             sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
2452                 wk->type = IEEE80211_WORK_ASSOC_BEACON_WAIT;
2453         else
2454                 wk->type = IEEE80211_WORK_ASSOC;
2455
2456         if (req->use_mfp) {
2457                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2458                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2459         } else {
2460                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2461                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2462         }
2463
2464         if (req->crypto.control_port)
2465                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2466         else
2467                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2468
2469         sdata->control_port_protocol = req->crypto.control_port_ethertype;
2470         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
2471
2472         ieee80211_add_work(wk);
2473         return 0;
2474 }
2475
2476 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2477                          struct cfg80211_deauth_request *req,
2478                          void *cookie)
2479 {
2480         struct ieee80211_local *local = sdata->local;
2481         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2482         struct ieee80211_work *wk;
2483         u8 bssid[ETH_ALEN];
2484         bool assoc_bss = false;
2485
2486         mutex_lock(&ifmgd->mtx);
2487
2488         memcpy(bssid, req->bss->bssid, ETH_ALEN);
2489         if (ifmgd->associated == req->bss) {
2490                 ieee80211_set_disassoc(sdata, false, true);
2491                 mutex_unlock(&ifmgd->mtx);
2492                 assoc_bss = true;
2493         } else {
2494                 bool not_auth_yet = false;
2495
2496                 mutex_unlock(&ifmgd->mtx);
2497
2498                 mutex_lock(&local->mtx);
2499                 list_for_each_entry(wk, &local->work_list, list) {
2500                         if (wk->sdata != sdata)
2501                                 continue;
2502
2503                         if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2504                             wk->type != IEEE80211_WORK_AUTH &&
2505                             wk->type != IEEE80211_WORK_ASSOC &&
2506                             wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
2507                                 continue;
2508
2509                         if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2510                                 continue;
2511
2512                         not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2513                         list_del_rcu(&wk->list);
2514                         free_work(wk);
2515                         break;
2516                 }
2517                 mutex_unlock(&local->mtx);
2518
2519                 /*
2520                  * If somebody requests authentication and we haven't
2521                  * sent out an auth frame yet there's no need to send
2522                  * out a deauth frame either. If the state was PROBE,
2523                  * then this is the case. If it's AUTH we have sent a
2524                  * frame, and if it's IDLE we have completed the auth
2525                  * process already.
2526                  */
2527                 if (not_auth_yet) {
2528                         __cfg80211_auth_canceled(sdata->dev, bssid);
2529                         return 0;
2530                 }
2531         }
2532
2533         printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2534                sdata->name, bssid, req->reason_code);
2535
2536         ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH,
2537                                        req->reason_code, cookie,
2538                                        !req->local_state_change);
2539         if (assoc_bss)
2540                 sta_info_destroy_addr(sdata, bssid);
2541
2542         mutex_lock(&sdata->local->mtx);
2543         ieee80211_recalc_idle(sdata->local);
2544         mutex_unlock(&sdata->local->mtx);
2545
2546         return 0;
2547 }
2548
2549 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2550                            struct cfg80211_disassoc_request *req,
2551                            void *cookie)
2552 {
2553         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2554         u8 bssid[ETH_ALEN];
2555
2556         mutex_lock(&ifmgd->mtx);
2557
2558         /*
2559          * cfg80211 should catch this ... but it's racy since
2560          * we can receive a disassoc frame, process it, hand it
2561          * to cfg80211 while that's in a locked section already
2562          * trying to tell us that the user wants to disconnect.
2563          */
2564         if (ifmgd->associated != req->bss) {
2565                 mutex_unlock(&ifmgd->mtx);
2566                 return -ENOLINK;
2567         }
2568
2569         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2570                sdata->name, req->bss->bssid, req->reason_code);
2571
2572         memcpy(bssid, req->bss->bssid, ETH_ALEN);
2573         ieee80211_set_disassoc(sdata, false, true);
2574
2575         mutex_unlock(&ifmgd->mtx);
2576
2577         ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2578                         IEEE80211_STYPE_DISASSOC, req->reason_code,
2579                         cookie, !req->local_state_change);
2580         sta_info_destroy_addr(sdata, bssid);
2581
2582         mutex_lock(&sdata->local->mtx);
2583         ieee80211_recalc_idle(sdata->local);
2584         mutex_unlock(&sdata->local->mtx);
2585
2586         return 0;
2587 }
2588
2589 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
2590                                enum nl80211_cqm_rssi_threshold_event rssi_event,
2591                                gfp_t gfp)
2592 {
2593         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2594
2595         trace_api_cqm_rssi_notify(sdata, rssi_event);
2596
2597         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
2598 }
2599 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);