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