Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wirel...
[linux-2.6.git] / net / mac80211 / mlme.c
1 /*
2  * BSS client mode implementation
3  * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
4  * Copyright 2004, Instant802 Networks, Inc.
5  * Copyright 2005, Devicescape Software, Inc.
6  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
7  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License version 2 as
11  * published by the Free Software Foundation.
12  */
13
14 #include <linux/delay.h>
15 #include <linux/if_ether.h>
16 #include <linux/skbuff.h>
17 #include <linux/if_arp.h>
18 #include <linux/etherdevice.h>
19 #include <linux/rtnetlink.h>
20 #include <linux/pm_qos_params.h>
21 #include <linux/crc32.h>
22 #include <linux/slab.h>
23 #include <net/mac80211.h>
24 #include <asm/unaligned.h>
25
26 #include "ieee80211_i.h"
27 #include "driver-ops.h"
28 #include "rate.h"
29 #include "led.h"
30
31 static int max_nullfunc_tries = 2;
32 module_param(max_nullfunc_tries, int, 0644);
33 MODULE_PARM_DESC(max_nullfunc_tries,
34                  "Maximum nullfunc tx tries before disconnecting (reason 4).");
35
36 static int max_probe_tries = 5;
37 module_param(max_probe_tries, int, 0644);
38 MODULE_PARM_DESC(max_probe_tries,
39                  "Maximum probe tries before disconnecting (reason 4).");
40
41 /*
42  * Beacon loss timeout is calculated as N frames times the
43  * advertised beacon interval.  This may need to be somewhat
44  * higher than what hardware might detect to account for
45  * delays in the host processing frames. But since we also
46  * probe on beacon miss before declaring the connection lost
47  * default to what we want.
48  */
49 #define IEEE80211_BEACON_LOSS_COUNT     7
50
51 /*
52  * Time the connection can be idle before we probe
53  * it to see if we can still talk to the AP.
54  */
55 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
56 /*
57  * Time we wait for a probe response after sending
58  * a probe request because of beacon loss or for
59  * checking the connection still works.
60  */
61 static int probe_wait_ms = 500;
62 module_param(probe_wait_ms, int, 0644);
63 MODULE_PARM_DESC(probe_wait_ms,
64                  "Maximum time(ms) to wait for probe response"
65                  " before disconnecting (reason 4).");
66
67 /*
68  * Weight given to the latest Beacon frame when calculating average signal
69  * strength for Beacon frames received in the current BSS. This must be
70  * between 1 and 15.
71  */
72 #define IEEE80211_SIGNAL_AVE_WEIGHT     3
73
74 /*
75  * How many Beacon frames need to have been used in average signal strength
76  * before starting to indicate signal change events.
77  */
78 #define IEEE80211_SIGNAL_AVE_MIN_COUNT  4
79
80 #define TMR_RUNNING_TIMER       0
81 #define TMR_RUNNING_CHANSW      1
82
83 /*
84  * All cfg80211 functions have to be called outside a locked
85  * section so that they can acquire a lock themselves... This
86  * is much simpler than queuing up things in cfg80211, but we
87  * do need some indirection for that here.
88  */
89 enum rx_mgmt_action {
90         /* no action required */
91         RX_MGMT_NONE,
92
93         /* caller must call cfg80211_send_deauth() */
94         RX_MGMT_CFG80211_DEAUTH,
95
96         /* caller must call cfg80211_send_disassoc() */
97         RX_MGMT_CFG80211_DISASSOC,
98 };
99
100 /* utils */
101 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
102 {
103         lockdep_assert_held(&ifmgd->mtx);
104 }
105
106 /*
107  * We can have multiple work items (and connection probing)
108  * scheduling this timer, but we need to take care to only
109  * reschedule it when it should fire _earlier_ than it was
110  * asked for before, or if it's not pending right now. This
111  * function ensures that. Note that it then is required to
112  * run this function for all timeouts after the first one
113  * has happened -- the work that runs from this timer will
114  * do that.
115  */
116 static void run_again(struct ieee80211_if_managed *ifmgd,
117                              unsigned long timeout)
118 {
119         ASSERT_MGD_MTX(ifmgd);
120
121         if (!timer_pending(&ifmgd->timer) ||
122             time_before(timeout, ifmgd->timer.expires))
123                 mod_timer(&ifmgd->timer, timeout);
124 }
125
126 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
127 {
128         if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
129                 return;
130
131         mod_timer(&sdata->u.mgd.bcn_mon_timer,
132                   round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
133 }
134
135 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
136 {
137         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
138
139         if (unlikely(!sdata->u.mgd.associated))
140                 return;
141
142         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
143                 return;
144
145         mod_timer(&sdata->u.mgd.conn_mon_timer,
146                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
147
148         ifmgd->probe_send_count = 0;
149 }
150
151 static int ecw2cw(int ecw)
152 {
153         return (1 << ecw) - 1;
154 }
155
156 /*
157  * ieee80211_enable_ht should be called only after the operating band
158  * has been determined as ht configuration depends on the hw's
159  * HT abilities for a specific band.
160  */
161 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
162                                struct ieee80211_ht_info *hti,
163                                const u8 *bssid, u16 ap_ht_cap_flags)
164 {
165         struct ieee80211_local *local = sdata->local;
166         struct ieee80211_supported_band *sband;
167         struct sta_info *sta;
168         u32 changed = 0;
169         int hti_cfreq;
170         u16 ht_opmode;
171         bool enable_ht = true;
172         enum nl80211_channel_type prev_chantype;
173         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
174
175         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
176
177         prev_chantype = sdata->vif.bss_conf.channel_type;
178
179         /* HT is not supported */
180         if (!sband->ht_cap.ht_supported)
181                 enable_ht = false;
182
183         if (enable_ht) {
184                 hti_cfreq = ieee80211_channel_to_frequency(hti->control_chan,
185                                                            sband->band);
186                 /* check that channel matches the right operating channel */
187                 if (local->hw.conf.channel->center_freq != hti_cfreq) {
188                         /* Some APs mess this up, evidently.
189                          * Netgear WNDR3700 sometimes reports 4 higher than
190                          * the actual channel, for instance.
191                          */
192                         printk(KERN_DEBUG
193                                "%s: Wrong control channel in association"
194                                " response: configured center-freq: %d"
195                                " hti-cfreq: %d  hti->control_chan: %d"
196                                " band: %d.  Disabling HT.\n",
197                                sdata->name,
198                                local->hw.conf.channel->center_freq,
199                                hti_cfreq, hti->control_chan,
200                                sband->band);
201                         enable_ht = false;
202                 }
203         }
204
205         if (enable_ht) {
206                 channel_type = NL80211_CHAN_HT20;
207
208                 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
209                     (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
210                     (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
211                         switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
212                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
213                                 if (!(local->hw.conf.channel->flags &
214                                     IEEE80211_CHAN_NO_HT40PLUS))
215                                         channel_type = NL80211_CHAN_HT40PLUS;
216                                 break;
217                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
218                                 if (!(local->hw.conf.channel->flags &
219                                     IEEE80211_CHAN_NO_HT40MINUS))
220                                         channel_type = NL80211_CHAN_HT40MINUS;
221                                 break;
222                         }
223                 }
224         }
225
226         if (local->tmp_channel)
227                 local->tmp_channel_type = channel_type;
228
229         if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
230                 /* can only fail due to HT40+/- mismatch */
231                 channel_type = NL80211_CHAN_HT20;
232                 WARN_ON(!ieee80211_set_channel_type(local, sdata, channel_type));
233         }
234
235         /* channel_type change automatically detected */
236         ieee80211_hw_config(local, 0);
237
238         if (prev_chantype != channel_type) {
239                 rcu_read_lock();
240                 sta = sta_info_get(sdata, bssid);
241                 if (sta)
242                         rate_control_rate_update(local, sband, sta,
243                                                  IEEE80211_RC_HT_CHANGED,
244                                                  channel_type);
245                 rcu_read_unlock();
246         }
247
248         ht_opmode = le16_to_cpu(hti->operation_mode);
249
250         /* if bss configuration changed store the new one */
251         if (sdata->ht_opmode_valid != enable_ht ||
252             sdata->vif.bss_conf.ht_operation_mode != ht_opmode ||
253             prev_chantype != channel_type) {
254                 changed |= BSS_CHANGED_HT;
255                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
256                 sdata->ht_opmode_valid = enable_ht;
257         }
258
259         return changed;
260 }
261
262 /* frame sending functions */
263
264 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
265                                            const u8 *bssid, u16 stype, u16 reason,
266                                            void *cookie, bool send_frame)
267 {
268         struct ieee80211_local *local = sdata->local;
269         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
270         struct sk_buff *skb;
271         struct ieee80211_mgmt *mgmt;
272
273         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
274         if (!skb) {
275                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
276                        "deauth/disassoc frame\n", sdata->name);
277                 return;
278         }
279         skb_reserve(skb, local->hw.extra_tx_headroom);
280
281         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
282         memset(mgmt, 0, 24);
283         memcpy(mgmt->da, bssid, ETH_ALEN);
284         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
285         memcpy(mgmt->bssid, bssid, ETH_ALEN);
286         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
287         skb_put(skb, 2);
288         /* u.deauth.reason_code == u.disassoc.reason_code */
289         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
290
291         if (stype == IEEE80211_STYPE_DEAUTH)
292                 if (cookie)
293                         __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
294                 else
295                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
296         else
297                 if (cookie)
298                         __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
299                 else
300                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
301         if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
302                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
303
304         if (send_frame)
305                 ieee80211_tx_skb(sdata, skb);
306         else
307                 kfree_skb(skb);
308 }
309
310 void ieee80211_send_pspoll(struct ieee80211_local *local,
311                            struct ieee80211_sub_if_data *sdata)
312 {
313         struct ieee80211_pspoll *pspoll;
314         struct sk_buff *skb;
315
316         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
317         if (!skb)
318                 return;
319
320         pspoll = (struct ieee80211_pspoll *) skb->data;
321         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
322
323         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
324         ieee80211_tx_skb(sdata, skb);
325 }
326
327 void ieee80211_send_nullfunc(struct ieee80211_local *local,
328                              struct ieee80211_sub_if_data *sdata,
329                              int powersave)
330 {
331         struct sk_buff *skb;
332         struct ieee80211_hdr_3addr *nullfunc;
333
334         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
335         if (!skb)
336                 return;
337
338         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
339         if (powersave)
340                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
341
342         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
343         ieee80211_tx_skb(sdata, skb);
344 }
345
346 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
347                                           struct ieee80211_sub_if_data *sdata)
348 {
349         struct sk_buff *skb;
350         struct ieee80211_hdr *nullfunc;
351         __le16 fc;
352
353         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
354                 return;
355
356         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
357         if (!skb) {
358                 printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr "
359                        "nullfunc frame\n", sdata->name);
360                 return;
361         }
362         skb_reserve(skb, local->hw.extra_tx_headroom);
363
364         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
365         memset(nullfunc, 0, 30);
366         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
367                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
368         nullfunc->frame_control = fc;
369         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
370         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
371         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
372         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
373
374         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
375         ieee80211_tx_skb(sdata, skb);
376 }
377
378 /* spectrum management related things */
379 static void ieee80211_chswitch_work(struct work_struct *work)
380 {
381         struct ieee80211_sub_if_data *sdata =
382                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
383         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
384
385         if (!ieee80211_sdata_running(sdata))
386                 return;
387
388         mutex_lock(&ifmgd->mtx);
389         if (!ifmgd->associated)
390                 goto out;
391
392         sdata->local->oper_channel = sdata->local->csa_channel;
393         if (!sdata->local->ops->channel_switch) {
394                 /* call "hw_config" only if doing sw channel switch */
395                 ieee80211_hw_config(sdata->local,
396                         IEEE80211_CONF_CHANGE_CHANNEL);
397         }
398
399         /* XXX: shouldn't really modify cfg80211-owned data! */
400         ifmgd->associated->channel = sdata->local->oper_channel;
401
402         ieee80211_wake_queues_by_reason(&sdata->local->hw,
403                                         IEEE80211_QUEUE_STOP_REASON_CSA);
404  out:
405         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
406         mutex_unlock(&ifmgd->mtx);
407 }
408
409 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
410 {
411         struct ieee80211_sub_if_data *sdata;
412         struct ieee80211_if_managed *ifmgd;
413
414         sdata = vif_to_sdata(vif);
415         ifmgd = &sdata->u.mgd;
416
417         trace_api_chswitch_done(sdata, success);
418         if (!success) {
419                 /*
420                  * If the channel switch was not successful, stay
421                  * around on the old channel. We currently lack
422                  * good handling of this situation, possibly we
423                  * should just drop the association.
424                  */
425                 sdata->local->csa_channel = sdata->local->oper_channel;
426         }
427
428         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
429 }
430 EXPORT_SYMBOL(ieee80211_chswitch_done);
431
432 static void ieee80211_chswitch_timer(unsigned long data)
433 {
434         struct ieee80211_sub_if_data *sdata =
435                 (struct ieee80211_sub_if_data *) data;
436         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
437
438         if (sdata->local->quiescing) {
439                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
440                 return;
441         }
442
443         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
444 }
445
446 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
447                                       struct ieee80211_channel_sw_ie *sw_elem,
448                                       struct ieee80211_bss *bss,
449                                       u64 timestamp)
450 {
451         struct cfg80211_bss *cbss =
452                 container_of((void *)bss, struct cfg80211_bss, priv);
453         struct ieee80211_channel *new_ch;
454         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
455         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num,
456                                                       cbss->channel->band);
457
458         ASSERT_MGD_MTX(ifmgd);
459
460         if (!ifmgd->associated)
461                 return;
462
463         if (sdata->local->scanning)
464                 return;
465
466         /* Disregard subsequent beacons if we are already running a timer
467            processing a CSA */
468
469         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
470                 return;
471
472         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
473         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
474                 return;
475
476         sdata->local->csa_channel = new_ch;
477
478         if (sdata->local->ops->channel_switch) {
479                 /* use driver's channel switch callback */
480                 struct ieee80211_channel_switch ch_switch;
481                 memset(&ch_switch, 0, sizeof(ch_switch));
482                 ch_switch.timestamp = timestamp;
483                 if (sw_elem->mode) {
484                         ch_switch.block_tx = true;
485                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
486                                         IEEE80211_QUEUE_STOP_REASON_CSA);
487                 }
488                 ch_switch.channel = new_ch;
489                 ch_switch.count = sw_elem->count;
490                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
491                 drv_channel_switch(sdata->local, &ch_switch);
492                 return;
493         }
494
495         /* channel switch handled in software */
496         if (sw_elem->count <= 1) {
497                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
498         } else {
499                 if (sw_elem->mode)
500                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
501                                         IEEE80211_QUEUE_STOP_REASON_CSA);
502                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
503                 mod_timer(&ifmgd->chswitch_timer,
504                           jiffies +
505                           msecs_to_jiffies(sw_elem->count *
506                                            cbss->beacon_interval));
507         }
508 }
509
510 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
511                                         u16 capab_info, u8 *pwr_constr_elem,
512                                         u8 pwr_constr_elem_len)
513 {
514         struct ieee80211_conf *conf = &sdata->local->hw.conf;
515
516         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
517                 return;
518
519         /* Power constraint IE length should be 1 octet */
520         if (pwr_constr_elem_len != 1)
521                 return;
522
523         if ((*pwr_constr_elem <= conf->channel->max_power) &&
524             (*pwr_constr_elem != sdata->local->power_constr_level)) {
525                 sdata->local->power_constr_level = *pwr_constr_elem;
526                 ieee80211_hw_config(sdata->local, 0);
527         }
528 }
529
530 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif)
531 {
532         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
533         struct ieee80211_local *local = sdata->local;
534         struct ieee80211_conf *conf = &local->hw.conf;
535
536         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
537                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
538                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
539
540         local->disable_dynamic_ps = false;
541         conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout;
542 }
543 EXPORT_SYMBOL(ieee80211_enable_dyn_ps);
544
545 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif)
546 {
547         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
548         struct ieee80211_local *local = sdata->local;
549         struct ieee80211_conf *conf = &local->hw.conf;
550
551         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
552                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
553                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
554
555         local->disable_dynamic_ps = true;
556         conf->dynamic_ps_timeout = 0;
557         del_timer_sync(&local->dynamic_ps_timer);
558         ieee80211_queue_work(&local->hw,
559                              &local->dynamic_ps_enable_work);
560 }
561 EXPORT_SYMBOL(ieee80211_disable_dyn_ps);
562
563 /* powersave */
564 static void ieee80211_enable_ps(struct ieee80211_local *local,
565                                 struct ieee80211_sub_if_data *sdata)
566 {
567         struct ieee80211_conf *conf = &local->hw.conf;
568
569         /*
570          * If we are scanning right now then the parameters will
571          * take effect when scan finishes.
572          */
573         if (local->scanning)
574                 return;
575
576         if (conf->dynamic_ps_timeout > 0 &&
577             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
578                 mod_timer(&local->dynamic_ps_timer, jiffies +
579                           msecs_to_jiffies(conf->dynamic_ps_timeout));
580         } else {
581                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
582                         ieee80211_send_nullfunc(local, sdata, 1);
583
584                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
585                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
586                         return;
587
588                 conf->flags |= IEEE80211_CONF_PS;
589                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
590         }
591 }
592
593 static void ieee80211_change_ps(struct ieee80211_local *local)
594 {
595         struct ieee80211_conf *conf = &local->hw.conf;
596
597         if (local->ps_sdata) {
598                 ieee80211_enable_ps(local, local->ps_sdata);
599         } else if (conf->flags & IEEE80211_CONF_PS) {
600                 conf->flags &= ~IEEE80211_CONF_PS;
601                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
602                 del_timer_sync(&local->dynamic_ps_timer);
603                 cancel_work_sync(&local->dynamic_ps_enable_work);
604         }
605 }
606
607 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
608 {
609         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
610         struct sta_info *sta = NULL;
611         u32 sta_flags = 0;
612
613         if (!mgd->powersave)
614                 return false;
615
616         if (!mgd->associated)
617                 return false;
618
619         if (!mgd->associated->beacon_ies)
620                 return false;
621
622         if (mgd->flags & (IEEE80211_STA_BEACON_POLL |
623                           IEEE80211_STA_CONNECTION_POLL))
624                 return false;
625
626         rcu_read_lock();
627         sta = sta_info_get(sdata, mgd->bssid);
628         if (sta)
629                 sta_flags = get_sta_flags(sta);
630         rcu_read_unlock();
631
632         if (!(sta_flags & WLAN_STA_AUTHORIZED))
633                 return false;
634
635         return true;
636 }
637
638 /* need to hold RTNL or interface lock */
639 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
640 {
641         struct ieee80211_sub_if_data *sdata, *found = NULL;
642         int count = 0;
643         int timeout;
644
645         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
646                 local->ps_sdata = NULL;
647                 return;
648         }
649
650         if (!list_empty(&local->work_list)) {
651                 local->ps_sdata = NULL;
652                 goto change;
653         }
654
655         list_for_each_entry(sdata, &local->interfaces, list) {
656                 if (!ieee80211_sdata_running(sdata))
657                         continue;
658                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
659                         /* If an AP vif is found, then disable PS
660                          * by setting the count to zero thereby setting
661                          * ps_sdata to NULL.
662                          */
663                         count = 0;
664                         break;
665                 }
666                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
667                         continue;
668                 found = sdata;
669                 count++;
670         }
671
672         if (count == 1 && ieee80211_powersave_allowed(found)) {
673                 struct ieee80211_conf *conf = &local->hw.conf;
674                 s32 beaconint_us;
675
676                 if (latency < 0)
677                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
678
679                 beaconint_us = ieee80211_tu_to_usec(
680                                         found->vif.bss_conf.beacon_int);
681
682                 timeout = local->dynamic_ps_forced_timeout;
683                 if (timeout < 0) {
684                         /*
685                          * Go to full PSM if the user configures a very low
686                          * latency requirement.
687                          * The 2000 second value is there for compatibility
688                          * until the PM_QOS_NETWORK_LATENCY is configured
689                          * with real values.
690                          */
691                         if (latency > (1900 * USEC_PER_MSEC) &&
692                             latency != (2000 * USEC_PER_SEC))
693                                 timeout = 0;
694                         else
695                                 timeout = 100;
696                 }
697                 local->dynamic_ps_user_timeout = timeout;
698                 if (!local->disable_dynamic_ps)
699                         conf->dynamic_ps_timeout =
700                                 local->dynamic_ps_user_timeout;
701
702                 if (beaconint_us > latency) {
703                         local->ps_sdata = NULL;
704                 } else {
705                         struct ieee80211_bss *bss;
706                         int maxslp = 1;
707                         u8 dtimper;
708
709                         bss = (void *)found->u.mgd.associated->priv;
710                         dtimper = bss->dtim_period;
711
712                         /* If the TIM IE is invalid, pretend the value is 1 */
713                         if (!dtimper)
714                                 dtimper = 1;
715                         else if (dtimper > 1)
716                                 maxslp = min_t(int, dtimper,
717                                                     latency / beaconint_us);
718
719                         local->hw.conf.max_sleep_period = maxslp;
720                         local->hw.conf.ps_dtim_period = dtimper;
721                         local->ps_sdata = found;
722                 }
723         } else {
724                 local->ps_sdata = NULL;
725         }
726
727  change:
728         ieee80211_change_ps(local);
729 }
730
731 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
732 {
733         struct ieee80211_local *local =
734                 container_of(work, struct ieee80211_local,
735                              dynamic_ps_disable_work);
736
737         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
738                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
739                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
740         }
741
742         ieee80211_wake_queues_by_reason(&local->hw,
743                                         IEEE80211_QUEUE_STOP_REASON_PS);
744 }
745
746 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
747 {
748         struct ieee80211_local *local =
749                 container_of(work, struct ieee80211_local,
750                              dynamic_ps_enable_work);
751         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
752         struct ieee80211_if_managed *ifmgd;
753         unsigned long flags;
754         int q;
755
756         /* can only happen when PS was just disabled anyway */
757         if (!sdata)
758                 return;
759
760         ifmgd = &sdata->u.mgd;
761
762         if (local->hw.conf.flags & IEEE80211_CONF_PS)
763                 return;
764
765         if (!local->disable_dynamic_ps &&
766             local->hw.conf.dynamic_ps_timeout > 0) {
767                 /* don't enter PS if TX frames are pending */
768                 if (drv_tx_frames_pending(local)) {
769                         mod_timer(&local->dynamic_ps_timer, jiffies +
770                                   msecs_to_jiffies(
771                                   local->hw.conf.dynamic_ps_timeout));
772                         return;
773                 }
774
775                 /*
776                  * transmission can be stopped by others which leads to
777                  * dynamic_ps_timer expiry. Postpone the ps timer if it
778                  * is not the actual idle state.
779                  */
780                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
781                 for (q = 0; q < local->hw.queues; q++) {
782                         if (local->queue_stop_reasons[q]) {
783                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
784                                                        flags);
785                                 mod_timer(&local->dynamic_ps_timer, jiffies +
786                                           msecs_to_jiffies(
787                                           local->hw.conf.dynamic_ps_timeout));
788                                 return;
789                         }
790                 }
791                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
792         }
793
794         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
795             (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED))) {
796                 netif_tx_stop_all_queues(sdata->dev);
797
798                 if (drv_tx_frames_pending(local))
799                         mod_timer(&local->dynamic_ps_timer, jiffies +
800                                   msecs_to_jiffies(
801                                   local->hw.conf.dynamic_ps_timeout));
802                 else {
803                         ieee80211_send_nullfunc(local, sdata, 1);
804                         /* Flush to get the tx status of nullfunc frame */
805                         drv_flush(local, false);
806                 }
807         }
808
809         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
810               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
811             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
812                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
813                 local->hw.conf.flags |= IEEE80211_CONF_PS;
814                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
815         }
816
817         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
818                 netif_tx_wake_all_queues(sdata->dev);
819 }
820
821 void ieee80211_dynamic_ps_timer(unsigned long data)
822 {
823         struct ieee80211_local *local = (void *) data;
824
825         if (local->quiescing || local->suspended)
826                 return;
827
828         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
829 }
830
831 /* MLME */
832 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
833                                      struct ieee80211_sub_if_data *sdata,
834                                      u8 *wmm_param, size_t wmm_param_len)
835 {
836         struct ieee80211_tx_queue_params params;
837         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
838         size_t left;
839         int count;
840         u8 *pos, uapsd_queues = 0;
841
842         if (!local->ops->conf_tx)
843                 return;
844
845         if (local->hw.queues < 4)
846                 return;
847
848         if (!wmm_param)
849                 return;
850
851         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
852                 return;
853
854         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
855                 uapsd_queues = local->uapsd_queues;
856
857         count = wmm_param[6] & 0x0f;
858         if (count == ifmgd->wmm_last_param_set)
859                 return;
860         ifmgd->wmm_last_param_set = count;
861
862         pos = wmm_param + 8;
863         left = wmm_param_len - 8;
864
865         memset(&params, 0, sizeof(params));
866
867         local->wmm_acm = 0;
868         for (; left >= 4; left -= 4, pos += 4) {
869                 int aci = (pos[0] >> 5) & 0x03;
870                 int acm = (pos[0] >> 4) & 0x01;
871                 bool uapsd = false;
872                 int queue;
873
874                 switch (aci) {
875                 case 1: /* AC_BK */
876                         queue = 3;
877                         if (acm)
878                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
879                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
880                                 uapsd = true;
881                         break;
882                 case 2: /* AC_VI */
883                         queue = 1;
884                         if (acm)
885                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
886                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
887                                 uapsd = true;
888                         break;
889                 case 3: /* AC_VO */
890                         queue = 0;
891                         if (acm)
892                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
893                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
894                                 uapsd = true;
895                         break;
896                 case 0: /* AC_BE */
897                 default:
898                         queue = 2;
899                         if (acm)
900                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
901                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
902                                 uapsd = true;
903                         break;
904                 }
905
906                 params.aifs = pos[0] & 0x0f;
907                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
908                 params.cw_min = ecw2cw(pos[1] & 0x0f);
909                 params.txop = get_unaligned_le16(pos + 2);
910                 params.uapsd = uapsd;
911
912 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
913                 wiphy_debug(local->hw.wiphy,
914                             "WMM queue=%d aci=%d acm=%d aifs=%d "
915                             "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
916                             queue, aci, acm,
917                             params.aifs, params.cw_min, params.cw_max,
918                             params.txop, params.uapsd);
919 #endif
920                 if (drv_conf_tx(local, queue, &params))
921                         wiphy_debug(local->hw.wiphy,
922                                     "failed to set TX queue parameters for queue %d\n",
923                                     queue);
924         }
925
926         /* enable WMM or activate new settings */
927         sdata->vif.bss_conf.qos = true;
928         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
929 }
930
931 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
932                                            u16 capab, bool erp_valid, u8 erp)
933 {
934         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
935         u32 changed = 0;
936         bool use_protection;
937         bool use_short_preamble;
938         bool use_short_slot;
939
940         if (erp_valid) {
941                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
942                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
943         } else {
944                 use_protection = false;
945                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
946         }
947
948         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
949         if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
950                 use_short_slot = true;
951
952         if (use_protection != bss_conf->use_cts_prot) {
953                 bss_conf->use_cts_prot = use_protection;
954                 changed |= BSS_CHANGED_ERP_CTS_PROT;
955         }
956
957         if (use_short_preamble != bss_conf->use_short_preamble) {
958                 bss_conf->use_short_preamble = use_short_preamble;
959                 changed |= BSS_CHANGED_ERP_PREAMBLE;
960         }
961
962         if (use_short_slot != bss_conf->use_short_slot) {
963                 bss_conf->use_short_slot = use_short_slot;
964                 changed |= BSS_CHANGED_ERP_SLOT;
965         }
966
967         return changed;
968 }
969
970 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
971                                      struct cfg80211_bss *cbss,
972                                      u32 bss_info_changed)
973 {
974         struct ieee80211_bss *bss = (void *)cbss->priv;
975         struct ieee80211_local *local = sdata->local;
976         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
977
978         bss_info_changed |= BSS_CHANGED_ASSOC;
979         /* set timing information */
980         bss_conf->beacon_int = cbss->beacon_interval;
981         bss_conf->timestamp = cbss->tsf;
982
983         bss_info_changed |= BSS_CHANGED_BEACON_INT;
984         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
985                 cbss->capability, bss->has_erp_value, bss->erp_value);
986
987         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
988                 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int));
989
990         sdata->u.mgd.associated = cbss;
991         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
992
993         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
994
995         /* just to be sure */
996         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
997                                 IEEE80211_STA_BEACON_POLL);
998
999         ieee80211_led_assoc(local, 1);
1000
1001         if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
1002                 bss_conf->dtim_period = bss->dtim_period;
1003         else
1004                 bss_conf->dtim_period = 0;
1005
1006         bss_conf->assoc = 1;
1007         /*
1008          * For now just always ask the driver to update the basic rateset
1009          * when we have associated, we aren't checking whether it actually
1010          * changed or not.
1011          */
1012         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
1013
1014         /* And the BSSID changed - we're associated now */
1015         bss_info_changed |= BSS_CHANGED_BSSID;
1016
1017         /* Tell the driver to monitor connection quality (if supported) */
1018         if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) &&
1019             bss_conf->cqm_rssi_thold)
1020                 bss_info_changed |= BSS_CHANGED_CQM;
1021
1022         /* Enable ARP filtering */
1023         if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
1024                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
1025                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1026         }
1027
1028         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1029
1030         mutex_lock(&local->iflist_mtx);
1031         ieee80211_recalc_ps(local, -1);
1032         ieee80211_recalc_smps(local);
1033         mutex_unlock(&local->iflist_mtx);
1034
1035         netif_tx_start_all_queues(sdata->dev);
1036         netif_carrier_on(sdata->dev);
1037 }
1038
1039 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1040                                    bool remove_sta, bool tx)
1041 {
1042         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1043         struct ieee80211_local *local = sdata->local;
1044         struct sta_info *sta;
1045         u32 changed = 0, config_changed = 0;
1046         u8 bssid[ETH_ALEN];
1047
1048         ASSERT_MGD_MTX(ifmgd);
1049
1050         if (WARN_ON(!ifmgd->associated))
1051                 return;
1052
1053         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1054
1055         ifmgd->associated = NULL;
1056         memset(ifmgd->bssid, 0, ETH_ALEN);
1057
1058         /*
1059          * we need to commit the associated = NULL change because the
1060          * scan code uses that to determine whether this iface should
1061          * go to/wake up from powersave or not -- and could otherwise
1062          * wake the queues erroneously.
1063          */
1064         smp_mb();
1065
1066         /*
1067          * Thus, we can only afterwards stop the queues -- to account
1068          * for the case where another CPU is finishing a scan at this
1069          * time -- we don't want the scan code to enable queues.
1070          */
1071
1072         netif_tx_stop_all_queues(sdata->dev);
1073         netif_carrier_off(sdata->dev);
1074
1075         mutex_lock(&local->sta_mtx);
1076         sta = sta_info_get(sdata, bssid);
1077         if (sta) {
1078                 set_sta_flags(sta, WLAN_STA_BLOCK_BA);
1079                 ieee80211_sta_tear_down_BA_sessions(sta, tx);
1080         }
1081         mutex_unlock(&local->sta_mtx);
1082
1083         changed |= ieee80211_reset_erp_info(sdata);
1084
1085         ieee80211_led_assoc(local, 0);
1086         changed |= BSS_CHANGED_ASSOC;
1087         sdata->vif.bss_conf.assoc = false;
1088
1089         ieee80211_set_wmm_default(sdata);
1090
1091         /* channel(_type) changes are handled by ieee80211_hw_config */
1092         WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
1093
1094         /* on the next assoc, re-program HT parameters */
1095         sdata->ht_opmode_valid = false;
1096
1097         local->power_constr_level = 0;
1098
1099         del_timer_sync(&local->dynamic_ps_timer);
1100         cancel_work_sync(&local->dynamic_ps_enable_work);
1101
1102         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1103                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1104                 config_changed |= IEEE80211_CONF_CHANGE_PS;
1105         }
1106         local->ps_sdata = NULL;
1107
1108         ieee80211_hw_config(local, config_changed);
1109
1110         /* Disable ARP filtering */
1111         if (sdata->vif.bss_conf.arp_filter_enabled) {
1112                 sdata->vif.bss_conf.arp_filter_enabled = false;
1113                 changed |= BSS_CHANGED_ARP_FILTER;
1114         }
1115
1116         /* The BSSID (not really interesting) and HT changed */
1117         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1118         ieee80211_bss_info_change_notify(sdata, changed);
1119
1120         if (remove_sta)
1121                 sta_info_destroy_addr(sdata, bssid);
1122
1123         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1124         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1125         del_timer_sync(&sdata->u.mgd.timer);
1126         del_timer_sync(&sdata->u.mgd.chswitch_timer);
1127 }
1128
1129 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1130                              struct ieee80211_hdr *hdr)
1131 {
1132         /*
1133          * We can postpone the mgd.timer whenever receiving unicast frames
1134          * from AP because we know that the connection is working both ways
1135          * at that time. But multicast frames (and hence also beacons) must
1136          * be ignored here, because we need to trigger the timer during
1137          * data idle periods for sending the periodic probe request to the
1138          * AP we're connected to.
1139          */
1140         if (is_multicast_ether_addr(hdr->addr1))
1141                 return;
1142
1143         ieee80211_sta_reset_conn_monitor(sdata);
1144 }
1145
1146 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1147 {
1148         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1149
1150         if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1151                               IEEE80211_STA_CONNECTION_POLL)))
1152             return;
1153
1154         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1155                           IEEE80211_STA_BEACON_POLL);
1156         mutex_lock(&sdata->local->iflist_mtx);
1157         ieee80211_recalc_ps(sdata->local, -1);
1158         mutex_unlock(&sdata->local->iflist_mtx);
1159
1160         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1161                 return;
1162
1163         /*
1164          * We've received a probe response, but are not sure whether
1165          * we have or will be receiving any beacons or data, so let's
1166          * schedule the timers again, just in case.
1167          */
1168         ieee80211_sta_reset_beacon_monitor(sdata);
1169
1170         mod_timer(&ifmgd->conn_mon_timer,
1171                   round_jiffies_up(jiffies +
1172                                    IEEE80211_CONNECTION_IDLE_TIME));
1173 }
1174
1175 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1176                              struct ieee80211_hdr *hdr, bool ack)
1177 {
1178         if (!ieee80211_is_data(hdr->frame_control))
1179             return;
1180
1181         if (ack)
1182                 ieee80211_sta_reset_conn_monitor(sdata);
1183
1184         if (ieee80211_is_nullfunc(hdr->frame_control) &&
1185             sdata->u.mgd.probe_send_count > 0) {
1186                 if (ack)
1187                         sdata->u.mgd.probe_send_count = 0;
1188                 else
1189                         sdata->u.mgd.nullfunc_failed = true;
1190                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1191         }
1192 }
1193
1194 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1195 {
1196         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1197         const u8 *ssid;
1198         u8 *dst = ifmgd->associated->bssid;
1199         u8 unicast_limit = max(1, max_probe_tries - 3);
1200
1201         /*
1202          * Try sending broadcast probe requests for the last three
1203          * probe requests after the first ones failed since some
1204          * buggy APs only support broadcast probe requests.
1205          */
1206         if (ifmgd->probe_send_count >= unicast_limit)
1207                 dst = NULL;
1208
1209         /*
1210          * When the hardware reports an accurate Tx ACK status, it's
1211          * better to send a nullfunc frame instead of a probe request,
1212          * as it will kick us off the AP quickly if we aren't associated
1213          * anymore. The timeout will be reset if the frame is ACKed by
1214          * the AP.
1215          */
1216         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1217                 ifmgd->nullfunc_failed = false;
1218                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1219         } else {
1220                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1221                 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid[1], NULL, 0,
1222                                          true);
1223         }
1224
1225         ifmgd->probe_send_count++;
1226         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1227         run_again(ifmgd, ifmgd->probe_timeout);
1228 }
1229
1230 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1231                                    bool beacon)
1232 {
1233         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1234         bool already = false;
1235
1236         if (!ieee80211_sdata_running(sdata))
1237                 return;
1238
1239         if (sdata->local->scanning)
1240                 return;
1241
1242         if (sdata->local->tmp_channel)
1243                 return;
1244
1245         mutex_lock(&ifmgd->mtx);
1246
1247         if (!ifmgd->associated)
1248                 goto out;
1249
1250 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1251         if (beacon && net_ratelimit())
1252                 printk(KERN_DEBUG "%s: detected beacon loss from AP "
1253                        "- sending probe request\n", sdata->name);
1254 #endif
1255
1256         /*
1257          * The driver/our work has already reported this event or the
1258          * connection monitoring has kicked in and we have already sent
1259          * a probe request. Or maybe the AP died and the driver keeps
1260          * reporting until we disassociate...
1261          *
1262          * In either case we have to ignore the current call to this
1263          * function (except for setting the correct probe reason bit)
1264          * because otherwise we would reset the timer every time and
1265          * never check whether we received a probe response!
1266          */
1267         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1268                             IEEE80211_STA_CONNECTION_POLL))
1269                 already = true;
1270
1271         if (beacon)
1272                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1273         else
1274                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1275
1276         if (already)
1277                 goto out;
1278
1279         mutex_lock(&sdata->local->iflist_mtx);
1280         ieee80211_recalc_ps(sdata->local, -1);
1281         mutex_unlock(&sdata->local->iflist_mtx);
1282
1283         ifmgd->probe_send_count = 0;
1284         ieee80211_mgd_probe_ap_send(sdata);
1285  out:
1286         mutex_unlock(&ifmgd->mtx);
1287 }
1288
1289 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
1290                                           struct ieee80211_vif *vif)
1291 {
1292         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1293         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1294         struct sk_buff *skb;
1295         const u8 *ssid;
1296
1297         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1298                 return NULL;
1299
1300         ASSERT_MGD_MTX(ifmgd);
1301
1302         if (!ifmgd->associated)
1303                 return NULL;
1304
1305         ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1306         skb = ieee80211_build_probe_req(sdata, ifmgd->associated->bssid,
1307                                         ssid + 2, ssid[1], NULL, 0, true);
1308
1309         return skb;
1310 }
1311 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
1312
1313 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
1314 {
1315         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1316         struct ieee80211_local *local = sdata->local;
1317         u8 bssid[ETH_ALEN];
1318
1319         mutex_lock(&ifmgd->mtx);
1320         if (!ifmgd->associated) {
1321                 mutex_unlock(&ifmgd->mtx);
1322                 return;
1323         }
1324
1325         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1326
1327         printk(KERN_DEBUG "%s: Connection to AP %pM lost.\n",
1328                sdata->name, bssid);
1329
1330         ieee80211_set_disassoc(sdata, true, true);
1331         mutex_unlock(&ifmgd->mtx);
1332
1333         mutex_lock(&local->mtx);
1334         ieee80211_recalc_idle(local);
1335         mutex_unlock(&local->mtx);
1336         /*
1337          * must be outside lock due to cfg80211,
1338          * but that's not a problem.
1339          */
1340         ieee80211_send_deauth_disassoc(sdata, bssid,
1341                                        IEEE80211_STYPE_DEAUTH,
1342                                        WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1343                                        NULL, true);
1344 }
1345
1346 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1347 {
1348         struct ieee80211_sub_if_data *sdata =
1349                 container_of(work, struct ieee80211_sub_if_data,
1350                              u.mgd.beacon_connection_loss_work);
1351
1352         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1353                 __ieee80211_connection_loss(sdata);
1354         else
1355                 ieee80211_mgd_probe_ap(sdata, true);
1356 }
1357
1358 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1359 {
1360         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1361         struct ieee80211_hw *hw = &sdata->local->hw;
1362
1363         trace_api_beacon_loss(sdata);
1364
1365         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1366         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1367 }
1368 EXPORT_SYMBOL(ieee80211_beacon_loss);
1369
1370 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1371 {
1372         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1373         struct ieee80211_hw *hw = &sdata->local->hw;
1374
1375         trace_api_connection_loss(sdata);
1376
1377         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1378         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1379 }
1380 EXPORT_SYMBOL(ieee80211_connection_loss);
1381
1382
1383 static enum rx_mgmt_action __must_check
1384 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1385                          struct ieee80211_mgmt *mgmt, size_t len)
1386 {
1387         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1388         const u8 *bssid = NULL;
1389         u16 reason_code;
1390
1391         if (len < 24 + 2)
1392                 return RX_MGMT_NONE;
1393
1394         ASSERT_MGD_MTX(ifmgd);
1395
1396         bssid = ifmgd->associated->bssid;
1397
1398         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1399
1400         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1401                         sdata->name, bssid, reason_code);
1402
1403         ieee80211_set_disassoc(sdata, true, false);
1404         mutex_lock(&sdata->local->mtx);
1405         ieee80211_recalc_idle(sdata->local);
1406         mutex_unlock(&sdata->local->mtx);
1407
1408         return RX_MGMT_CFG80211_DEAUTH;
1409 }
1410
1411
1412 static enum rx_mgmt_action __must_check
1413 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1414                            struct ieee80211_mgmt *mgmt, size_t len)
1415 {
1416         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1417         u16 reason_code;
1418
1419         if (len < 24 + 2)
1420                 return RX_MGMT_NONE;
1421
1422         ASSERT_MGD_MTX(ifmgd);
1423
1424         if (WARN_ON(!ifmgd->associated))
1425                 return RX_MGMT_NONE;
1426
1427         if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
1428                 return RX_MGMT_NONE;
1429
1430         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1431
1432         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1433                         sdata->name, mgmt->sa, reason_code);
1434
1435         ieee80211_set_disassoc(sdata, true, false);
1436         mutex_lock(&sdata->local->mtx);
1437         ieee80211_recalc_idle(sdata->local);
1438         mutex_unlock(&sdata->local->mtx);
1439         return RX_MGMT_CFG80211_DISASSOC;
1440 }
1441
1442
1443 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1444                                     struct ieee80211_mgmt *mgmt, size_t len)
1445 {
1446         struct ieee80211_sub_if_data *sdata = wk->sdata;
1447         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1448         struct ieee80211_local *local = sdata->local;
1449         struct ieee80211_supported_band *sband;
1450         struct sta_info *sta;
1451         struct cfg80211_bss *cbss = wk->assoc.bss;
1452         u8 *pos;
1453         u32 rates, basic_rates;
1454         u16 capab_info, aid;
1455         struct ieee802_11_elems elems;
1456         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1457         u32 changed = 0;
1458         int i, j, err;
1459         bool have_higher_than_11mbit = false;
1460         u16 ap_ht_cap_flags;
1461
1462         /* AssocResp and ReassocResp have identical structure */
1463
1464         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1465         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1466
1467         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1468                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1469                        "set\n", sdata->name, aid);
1470         aid &= ~(BIT(15) | BIT(14));
1471
1472         pos = mgmt->u.assoc_resp.variable;
1473         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1474
1475         if (!elems.supp_rates) {
1476                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1477                        sdata->name);
1478                 return false;
1479         }
1480
1481         ifmgd->aid = aid;
1482
1483         sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1484         if (!sta) {
1485                 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1486                        " the AP\n", sdata->name);
1487                 return false;
1488         }
1489
1490         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1491                            WLAN_STA_ASSOC_AP);
1492         if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1493                 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1494
1495         rates = 0;
1496         basic_rates = 0;
1497         sband = local->hw.wiphy->bands[wk->chan->band];
1498
1499         for (i = 0; i < elems.supp_rates_len; i++) {
1500                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1501                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1502
1503                 if (rate > 110)
1504                         have_higher_than_11mbit = true;
1505
1506                 for (j = 0; j < sband->n_bitrates; j++) {
1507                         if (sband->bitrates[j].bitrate == rate) {
1508                                 rates |= BIT(j);
1509                                 if (is_basic)
1510                                         basic_rates |= BIT(j);
1511                                 break;
1512                         }
1513                 }
1514         }
1515
1516         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1517                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1518                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1519
1520                 if (rate > 110)
1521                         have_higher_than_11mbit = true;
1522
1523                 for (j = 0; j < sband->n_bitrates; j++) {
1524                         if (sband->bitrates[j].bitrate == rate) {
1525                                 rates |= BIT(j);
1526                                 if (is_basic)
1527                                         basic_rates |= BIT(j);
1528                                 break;
1529                         }
1530                 }
1531         }
1532
1533         sta->sta.supp_rates[wk->chan->band] = rates;
1534         sdata->vif.bss_conf.basic_rates = basic_rates;
1535
1536         /* cf. IEEE 802.11 9.2.12 */
1537         if (wk->chan->band == IEEE80211_BAND_2GHZ &&
1538             have_higher_than_11mbit)
1539                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1540         else
1541                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1542
1543         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1544                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1545                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1546
1547         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1548
1549         rate_control_rate_init(sta);
1550
1551         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1552                 set_sta_flags(sta, WLAN_STA_MFP);
1553
1554         if (elems.wmm_param)
1555                 set_sta_flags(sta, WLAN_STA_WME);
1556
1557         err = sta_info_insert(sta);
1558         sta = NULL;
1559         if (err) {
1560                 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1561                        " the AP (error %d)\n", sdata->name, err);
1562                 return false;
1563         }
1564
1565         /*
1566          * Always handle WMM once after association regardless
1567          * of the first value the AP uses. Setting -1 here has
1568          * that effect because the AP values is an unsigned
1569          * 4-bit value.
1570          */
1571         ifmgd->wmm_last_param_set = -1;
1572
1573         if (elems.wmm_param)
1574                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1575                                          elems.wmm_param_len);
1576         else
1577                 ieee80211_set_wmm_default(sdata);
1578
1579         local->oper_channel = wk->chan;
1580
1581         if (elems.ht_info_elem && elems.wmm_param &&
1582             (sdata->local->hw.queues >= 4) &&
1583             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1584                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1585                                                cbss->bssid, ap_ht_cap_flags);
1586
1587         /* set AID and assoc capability,
1588          * ieee80211_set_associated() will tell the driver */
1589         bss_conf->aid = aid;
1590         bss_conf->assoc_capability = capab_info;
1591         ieee80211_set_associated(sdata, cbss, changed);
1592
1593         /*
1594          * If we're using 4-addr mode, let the AP know that we're
1595          * doing so, so that it can create the STA VLAN on its side
1596          */
1597         if (ifmgd->use_4addr)
1598                 ieee80211_send_4addr_nullfunc(local, sdata);
1599
1600         /*
1601          * Start timer to probe the connection to the AP now.
1602          * Also start the timer that will detect beacon loss.
1603          */
1604         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1605         ieee80211_sta_reset_beacon_monitor(sdata);
1606
1607         return true;
1608 }
1609
1610
1611 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1612                                   struct ieee80211_mgmt *mgmt,
1613                                   size_t len,
1614                                   struct ieee80211_rx_status *rx_status,
1615                                   struct ieee802_11_elems *elems,
1616                                   bool beacon)
1617 {
1618         struct ieee80211_local *local = sdata->local;
1619         int freq;
1620         struct ieee80211_bss *bss;
1621         struct ieee80211_channel *channel;
1622         bool need_ps = false;
1623
1624         if (sdata->u.mgd.associated) {
1625                 bss = (void *)sdata->u.mgd.associated->priv;
1626                 /* not previously set so we may need to recalc */
1627                 need_ps = !bss->dtim_period;
1628         }
1629
1630         if (elems->ds_params && elems->ds_params_len == 1)
1631                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
1632                                                       rx_status->band);
1633         else
1634                 freq = rx_status->freq;
1635
1636         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1637
1638         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1639                 return;
1640
1641         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1642                                         channel, beacon);
1643         if (bss)
1644                 ieee80211_rx_bss_put(local, bss);
1645
1646         if (!sdata->u.mgd.associated)
1647                 return;
1648
1649         if (need_ps) {
1650                 mutex_lock(&local->iflist_mtx);
1651                 ieee80211_recalc_ps(local, -1);
1652                 mutex_unlock(&local->iflist_mtx);
1653         }
1654
1655         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1656             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1657                                                         ETH_ALEN) == 0)) {
1658                 struct ieee80211_channel_sw_ie *sw_elem =
1659                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1660                 ieee80211_sta_process_chanswitch(sdata, sw_elem,
1661                                                  bss, rx_status->mactime);
1662         }
1663 }
1664
1665
1666 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1667                                          struct sk_buff *skb)
1668 {
1669         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1670         struct ieee80211_if_managed *ifmgd;
1671         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1672         size_t baselen, len = skb->len;
1673         struct ieee802_11_elems elems;
1674
1675         ifmgd = &sdata->u.mgd;
1676
1677         ASSERT_MGD_MTX(ifmgd);
1678
1679         if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1680                 return; /* ignore ProbeResp to foreign address */
1681
1682         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1683         if (baselen > len)
1684                 return;
1685
1686         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1687                                 &elems);
1688
1689         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1690
1691         if (ifmgd->associated &&
1692             memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0)
1693                 ieee80211_reset_ap_probe(sdata);
1694 }
1695
1696 /*
1697  * This is the canonical list of information elements we care about,
1698  * the filter code also gives us all changes to the Microsoft OUI
1699  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1700  *
1701  * We implement beacon filtering in software since that means we can
1702  * avoid processing the frame here and in cfg80211, and userspace
1703  * will not be able to tell whether the hardware supports it or not.
1704  *
1705  * XXX: This list needs to be dynamic -- userspace needs to be able to
1706  *      add items it requires. It also needs to be able to tell us to
1707  *      look out for other vendor IEs.
1708  */
1709 static const u64 care_about_ies =
1710         (1ULL << WLAN_EID_COUNTRY) |
1711         (1ULL << WLAN_EID_ERP_INFO) |
1712         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1713         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1714         (1ULL << WLAN_EID_HT_CAPABILITY) |
1715         (1ULL << WLAN_EID_HT_INFORMATION);
1716
1717 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1718                                      struct ieee80211_mgmt *mgmt,
1719                                      size_t len,
1720                                      struct ieee80211_rx_status *rx_status)
1721 {
1722         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1723         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1724         size_t baselen;
1725         struct ieee802_11_elems elems;
1726         struct ieee80211_local *local = sdata->local;
1727         u32 changed = 0;
1728         bool erp_valid, directed_tim = false;
1729         u8 erp_value = 0;
1730         u32 ncrc;
1731         u8 *bssid;
1732
1733         ASSERT_MGD_MTX(ifmgd);
1734
1735         /* Process beacon from the current BSS */
1736         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1737         if (baselen > len)
1738                 return;
1739
1740         if (rx_status->freq != local->hw.conf.channel->center_freq)
1741                 return;
1742
1743         /*
1744          * We might have received a number of frames, among them a
1745          * disassoc frame and a beacon...
1746          */
1747         if (!ifmgd->associated)
1748                 return;
1749
1750         bssid = ifmgd->associated->bssid;
1751
1752         /*
1753          * And in theory even frames from a different AP we were just
1754          * associated to a split-second ago!
1755          */
1756         if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1757                 return;
1758
1759         /* Track average RSSI from the Beacon frames of the current AP */
1760         ifmgd->last_beacon_signal = rx_status->signal;
1761         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
1762                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
1763                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
1764                 ifmgd->last_cqm_event_signal = 0;
1765                 ifmgd->count_beacon_signal = 1;
1766         } else {
1767                 ifmgd->ave_beacon_signal =
1768                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
1769                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
1770                          ifmgd->ave_beacon_signal) / 16;
1771                 ifmgd->count_beacon_signal++;
1772         }
1773         if (bss_conf->cqm_rssi_thold &&
1774             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
1775             !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) {
1776                 int sig = ifmgd->ave_beacon_signal / 16;
1777                 int last_event = ifmgd->last_cqm_event_signal;
1778                 int thold = bss_conf->cqm_rssi_thold;
1779                 int hyst = bss_conf->cqm_rssi_hyst;
1780                 if (sig < thold &&
1781                     (last_event == 0 || sig < last_event - hyst)) {
1782                         ifmgd->last_cqm_event_signal = sig;
1783                         ieee80211_cqm_rssi_notify(
1784                                 &sdata->vif,
1785                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
1786                                 GFP_KERNEL);
1787                 } else if (sig > thold &&
1788                            (last_event == 0 || sig > last_event + hyst)) {
1789                         ifmgd->last_cqm_event_signal = sig;
1790                         ieee80211_cqm_rssi_notify(
1791                                 &sdata->vif,
1792                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
1793                                 GFP_KERNEL);
1794                 }
1795         }
1796
1797         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1798 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1799                 if (net_ratelimit()) {
1800                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1801                                "to a received beacon\n", sdata->name);
1802                 }
1803 #endif
1804                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1805                 mutex_lock(&local->iflist_mtx);
1806                 ieee80211_recalc_ps(local, -1);
1807                 mutex_unlock(&local->iflist_mtx);
1808         }
1809
1810         /*
1811          * Push the beacon loss detection into the future since
1812          * we are processing a beacon from the AP just now.
1813          */
1814         ieee80211_sta_reset_beacon_monitor(sdata);
1815
1816         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1817         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1818                                           len - baselen, &elems,
1819                                           care_about_ies, ncrc);
1820
1821         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1822                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1823                                                    ifmgd->aid);
1824
1825         if (ncrc != ifmgd->beacon_crc || !ifmgd->beacon_crc_valid) {
1826                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1827                                       true);
1828
1829                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1830                                          elems.wmm_param_len);
1831         }
1832
1833         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1834                 if (directed_tim) {
1835                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1836                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1837                                 ieee80211_hw_config(local,
1838                                                     IEEE80211_CONF_CHANGE_PS);
1839                                 ieee80211_send_nullfunc(local, sdata, 0);
1840                         } else {
1841                                 local->pspolling = true;
1842
1843                                 /*
1844                                  * Here is assumed that the driver will be
1845                                  * able to send ps-poll frame and receive a
1846                                  * response even though power save mode is
1847                                  * enabled, but some drivers might require
1848                                  * to disable power save here. This needs
1849                                  * to be investigated.
1850                                  */
1851                                 ieee80211_send_pspoll(local, sdata);
1852                         }
1853                 }
1854         }
1855
1856         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
1857                 return;
1858         ifmgd->beacon_crc = ncrc;
1859         ifmgd->beacon_crc_valid = true;
1860
1861         if (elems.erp_info && elems.erp_info_len >= 1) {
1862                 erp_valid = true;
1863                 erp_value = elems.erp_info[0];
1864         } else {
1865                 erp_valid = false;
1866         }
1867         changed |= ieee80211_handle_bss_capability(sdata,
1868                         le16_to_cpu(mgmt->u.beacon.capab_info),
1869                         erp_valid, erp_value);
1870
1871
1872         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1873             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1874                 struct sta_info *sta;
1875                 struct ieee80211_supported_band *sband;
1876                 u16 ap_ht_cap_flags;
1877
1878                 rcu_read_lock();
1879
1880                 sta = sta_info_get(sdata, bssid);
1881                 if (WARN_ON(!sta)) {
1882                         rcu_read_unlock();
1883                         return;
1884                 }
1885
1886                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1887
1888                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1889                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1890
1891                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1892
1893                 rcu_read_unlock();
1894
1895                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1896                                                bssid, ap_ht_cap_flags);
1897         }
1898
1899         /* Note: country IE parsing is done for us by cfg80211 */
1900         if (elems.country_elem) {
1901                 /* TODO: IBSS also needs this */
1902                 if (elems.pwr_constr_elem)
1903                         ieee80211_handle_pwr_constr(sdata,
1904                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1905                                 elems.pwr_constr_elem,
1906                                 elems.pwr_constr_elem_len);
1907         }
1908
1909         ieee80211_bss_info_change_notify(sdata, changed);
1910 }
1911
1912 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1913                                   struct sk_buff *skb)
1914 {
1915         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1916         struct ieee80211_rx_status *rx_status;
1917         struct ieee80211_mgmt *mgmt;
1918         enum rx_mgmt_action rma = RX_MGMT_NONE;
1919         u16 fc;
1920
1921         rx_status = (struct ieee80211_rx_status *) skb->cb;
1922         mgmt = (struct ieee80211_mgmt *) skb->data;
1923         fc = le16_to_cpu(mgmt->frame_control);
1924
1925         mutex_lock(&ifmgd->mtx);
1926
1927         if (ifmgd->associated &&
1928             memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1929                 switch (fc & IEEE80211_FCTL_STYPE) {
1930                 case IEEE80211_STYPE_BEACON:
1931                         ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1932                                                  rx_status);
1933                         break;
1934                 case IEEE80211_STYPE_PROBE_RESP:
1935                         ieee80211_rx_mgmt_probe_resp(sdata, skb);
1936                         break;
1937                 case IEEE80211_STYPE_DEAUTH:
1938                         rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1939                         break;
1940                 case IEEE80211_STYPE_DISASSOC:
1941                         rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1942                         break;
1943                 case IEEE80211_STYPE_ACTION:
1944                         switch (mgmt->u.action.category) {
1945                         case WLAN_CATEGORY_SPECTRUM_MGMT:
1946                                 ieee80211_sta_process_chanswitch(sdata,
1947                                                 &mgmt->u.action.u.chan_switch.sw_elem,
1948                                                 (void *)ifmgd->associated->priv,
1949                                                 rx_status->mactime);
1950                                 break;
1951                         }
1952                 }
1953                 mutex_unlock(&ifmgd->mtx);
1954
1955                 switch (rma) {
1956                 case RX_MGMT_NONE:
1957                         /* no action */
1958                         break;
1959                 case RX_MGMT_CFG80211_DEAUTH:
1960                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1961                         break;
1962                 case RX_MGMT_CFG80211_DISASSOC:
1963                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1964                         break;
1965                 default:
1966                         WARN(1, "unexpected: %d", rma);
1967                 }
1968                 return;
1969         }
1970
1971         mutex_unlock(&ifmgd->mtx);
1972
1973         if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1974             (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH) {
1975                 struct ieee80211_local *local = sdata->local;
1976                 struct ieee80211_work *wk;
1977
1978                 mutex_lock(&local->mtx);
1979                 list_for_each_entry(wk, &local->work_list, list) {
1980                         if (wk->sdata != sdata)
1981                                 continue;
1982
1983                         if (wk->type != IEEE80211_WORK_ASSOC &&
1984                             wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
1985                                 continue;
1986
1987                         if (memcmp(mgmt->bssid, wk->filter_ta, ETH_ALEN))
1988                                 continue;
1989                         if (memcmp(mgmt->sa, wk->filter_ta, ETH_ALEN))
1990                                 continue;
1991
1992                         /*
1993                          * Printing the message only here means we can't
1994                          * spuriously print it, but it also means that it
1995                          * won't be printed when the frame comes in before
1996                          * we even tried to associate or in similar cases.
1997                          *
1998                          * Ultimately, I suspect cfg80211 should print the
1999                          * messages instead.
2000                          */
2001                         printk(KERN_DEBUG
2002                                "%s: deauthenticated from %pM (Reason: %u)\n",
2003                                sdata->name, mgmt->bssid,
2004                                le16_to_cpu(mgmt->u.deauth.reason_code));
2005
2006                         list_del_rcu(&wk->list);
2007                         free_work(wk);
2008                         break;
2009                 }
2010                 mutex_unlock(&local->mtx);
2011
2012                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
2013         }
2014 }
2015
2016 static void ieee80211_sta_timer(unsigned long data)
2017 {
2018         struct ieee80211_sub_if_data *sdata =
2019                 (struct ieee80211_sub_if_data *) data;
2020         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2021         struct ieee80211_local *local = sdata->local;
2022
2023         if (local->quiescing) {
2024                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2025                 return;
2026         }
2027
2028         ieee80211_queue_work(&local->hw, &sdata->work);
2029 }
2030
2031 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
2032                                           u8 *bssid)
2033 {
2034         struct ieee80211_local *local = sdata->local;
2035         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2036
2037         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
2038                           IEEE80211_STA_BEACON_POLL);
2039
2040         ieee80211_set_disassoc(sdata, true, true);
2041         mutex_unlock(&ifmgd->mtx);
2042         mutex_lock(&local->mtx);
2043         ieee80211_recalc_idle(local);
2044         mutex_unlock(&local->mtx);
2045         /*
2046          * must be outside lock due to cfg80211,
2047          * but that's not a problem.
2048          */
2049         ieee80211_send_deauth_disassoc(sdata, bssid,
2050                         IEEE80211_STYPE_DEAUTH,
2051                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
2052                         NULL, true);
2053         mutex_lock(&ifmgd->mtx);
2054 }
2055
2056 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
2057 {
2058         struct ieee80211_local *local = sdata->local;
2059         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2060
2061         /* then process the rest of the work */
2062         mutex_lock(&ifmgd->mtx);
2063
2064         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2065                             IEEE80211_STA_CONNECTION_POLL) &&
2066             ifmgd->associated) {
2067                 u8 bssid[ETH_ALEN];
2068                 int max_tries;
2069
2070                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
2071
2072                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2073                         max_tries = max_nullfunc_tries;
2074                 else
2075                         max_tries = max_probe_tries;
2076
2077                 /* ACK received for nullfunc probing frame */
2078                 if (!ifmgd->probe_send_count)
2079                         ieee80211_reset_ap_probe(sdata);
2080                 else if (ifmgd->nullfunc_failed) {
2081                         if (ifmgd->probe_send_count < max_tries) {
2082 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2083                                 wiphy_debug(local->hw.wiphy,
2084                                             "%s: No ack for nullfunc frame to"
2085                                             " AP %pM, try %d/%i\n",
2086                                             sdata->name, bssid,
2087                                             ifmgd->probe_send_count, max_tries);
2088 #endif
2089                                 ieee80211_mgd_probe_ap_send(sdata);
2090                         } else {
2091 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2092                                 wiphy_debug(local->hw.wiphy,
2093                                             "%s: No ack for nullfunc frame to"
2094                                             " AP %pM, disconnecting.\n",
2095                                             sdata->name, bssid);
2096 #endif
2097                                 ieee80211_sta_connection_lost(sdata, bssid);
2098                         }
2099                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
2100                         run_again(ifmgd, ifmgd->probe_timeout);
2101                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2102 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2103                         wiphy_debug(local->hw.wiphy,
2104                                     "%s: Failed to send nullfunc to AP %pM"
2105                                     " after %dms, disconnecting.\n",
2106                                     sdata->name,
2107                                     bssid, probe_wait_ms);
2108 #endif
2109                         ieee80211_sta_connection_lost(sdata, bssid);
2110                 } else if (ifmgd->probe_send_count < max_tries) {
2111 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2112                         wiphy_debug(local->hw.wiphy,
2113                                     "%s: No probe response from AP %pM"
2114                                     " after %dms, try %d/%i\n",
2115                                     sdata->name,
2116                                     bssid, probe_wait_ms,
2117                                     ifmgd->probe_send_count, max_tries);
2118 #endif
2119                         ieee80211_mgd_probe_ap_send(sdata);
2120                 } else {
2121                         /*
2122                          * We actually lost the connection ... or did we?
2123                          * Let's make sure!
2124                          */
2125                         wiphy_debug(local->hw.wiphy,
2126                                     "%s: No probe response from AP %pM"
2127                                     " after %dms, disconnecting.\n",
2128                                     sdata->name,
2129                                     bssid, probe_wait_ms);
2130
2131                         ieee80211_sta_connection_lost(sdata, bssid);
2132                 }
2133         }
2134
2135         mutex_unlock(&ifmgd->mtx);
2136 }
2137
2138 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
2139 {
2140         struct ieee80211_sub_if_data *sdata =
2141                 (struct ieee80211_sub_if_data *) data;
2142         struct ieee80211_local *local = sdata->local;
2143
2144         if (local->quiescing)
2145                 return;
2146
2147         ieee80211_queue_work(&sdata->local->hw,
2148                              &sdata->u.mgd.beacon_connection_loss_work);
2149 }
2150
2151 static void ieee80211_sta_conn_mon_timer(unsigned long data)
2152 {
2153         struct ieee80211_sub_if_data *sdata =
2154                 (struct ieee80211_sub_if_data *) data;
2155         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2156         struct ieee80211_local *local = sdata->local;
2157
2158         if (local->quiescing)
2159                 return;
2160
2161         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
2162 }
2163
2164 static void ieee80211_sta_monitor_work(struct work_struct *work)
2165 {
2166         struct ieee80211_sub_if_data *sdata =
2167                 container_of(work, struct ieee80211_sub_if_data,
2168                              u.mgd.monitor_work);
2169
2170         ieee80211_mgd_probe_ap(sdata, false);
2171 }
2172
2173 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2174 {
2175         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2176                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
2177                                         IEEE80211_STA_CONNECTION_POLL);
2178
2179                 /* let's probe the connection once */
2180                 ieee80211_queue_work(&sdata->local->hw,
2181                            &sdata->u.mgd.monitor_work);
2182                 /* and do all the other regular work too */
2183                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2184         }
2185 }
2186
2187 #ifdef CONFIG_PM
2188 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2189 {
2190         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2191
2192         /*
2193          * we need to use atomic bitops for the running bits
2194          * only because both timers might fire at the same
2195          * time -- the code here is properly synchronised.
2196          */
2197
2198         cancel_work_sync(&ifmgd->request_smps_work);
2199
2200         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
2201         if (del_timer_sync(&ifmgd->timer))
2202                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2203
2204         cancel_work_sync(&ifmgd->chswitch_work);
2205         if (del_timer_sync(&ifmgd->chswitch_timer))
2206                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2207
2208         cancel_work_sync(&ifmgd->monitor_work);
2209         /* these will just be re-established on connection */
2210         del_timer_sync(&ifmgd->conn_mon_timer);
2211         del_timer_sync(&ifmgd->bcn_mon_timer);
2212 }
2213
2214 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2215 {
2216         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2217
2218         if (!ifmgd->associated)
2219                 return;
2220
2221         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2222                 add_timer(&ifmgd->timer);
2223         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2224                 add_timer(&ifmgd->chswitch_timer);
2225         ieee80211_sta_reset_beacon_monitor(sdata);
2226         ieee80211_restart_sta_timer(sdata);
2227         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.monitor_work);
2228 }
2229 #endif
2230
2231 /* interface setup */
2232 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2233 {
2234         struct ieee80211_if_managed *ifmgd;
2235
2236         ifmgd = &sdata->u.mgd;
2237         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
2238         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2239         INIT_WORK(&ifmgd->beacon_connection_loss_work,
2240                   ieee80211_beacon_connection_loss_work);
2241         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
2242         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2243                     (unsigned long) sdata);
2244         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
2245                     (unsigned long) sdata);
2246         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
2247                     (unsigned long) sdata);
2248         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2249                     (unsigned long) sdata);
2250
2251         ifmgd->flags = 0;
2252
2253         mutex_init(&ifmgd->mtx);
2254
2255         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
2256                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
2257         else
2258                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
2259 }
2260
2261 /* scan finished notification */
2262 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2263 {
2264         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2265
2266         /* Restart STA timers */
2267         rcu_read_lock();
2268         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2269                 ieee80211_restart_sta_timer(sdata);
2270         rcu_read_unlock();
2271 }
2272
2273 int ieee80211_max_network_latency(struct notifier_block *nb,
2274                                   unsigned long data, void *dummy)
2275 {
2276         s32 latency_usec = (s32) data;
2277         struct ieee80211_local *local =
2278                 container_of(nb, struct ieee80211_local,
2279                              network_latency_notifier);
2280
2281         mutex_lock(&local->iflist_mtx);
2282         ieee80211_recalc_ps(local, latency_usec);
2283         mutex_unlock(&local->iflist_mtx);
2284
2285         return 0;
2286 }
2287
2288 /* config hooks */
2289 static enum work_done_result
2290 ieee80211_probe_auth_done(struct ieee80211_work *wk,
2291                           struct sk_buff *skb)
2292 {
2293         if (!skb) {
2294                 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
2295                 return WORK_DONE_DESTROY;
2296         }
2297
2298         if (wk->type == IEEE80211_WORK_AUTH) {
2299                 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
2300                 return WORK_DONE_DESTROY;
2301         }
2302
2303         mutex_lock(&wk->sdata->u.mgd.mtx);
2304         ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
2305         mutex_unlock(&wk->sdata->u.mgd.mtx);
2306
2307         wk->type = IEEE80211_WORK_AUTH;
2308         wk->probe_auth.tries = 0;
2309         return WORK_DONE_REQUEUE;
2310 }
2311
2312 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
2313                        struct cfg80211_auth_request *req)
2314 {
2315         const u8 *ssid;
2316         struct ieee80211_work *wk;
2317         u16 auth_alg;
2318
2319         if (req->local_state_change)
2320                 return 0; /* no need to update mac80211 state */
2321
2322         switch (req->auth_type) {
2323         case NL80211_AUTHTYPE_OPEN_SYSTEM:
2324                 auth_alg = WLAN_AUTH_OPEN;
2325                 break;
2326         case NL80211_AUTHTYPE_SHARED_KEY:
2327                 if (IS_ERR(sdata->local->wep_tx_tfm))
2328                         return -EOPNOTSUPP;
2329                 auth_alg = WLAN_AUTH_SHARED_KEY;
2330                 break;
2331         case NL80211_AUTHTYPE_FT:
2332                 auth_alg = WLAN_AUTH_FT;
2333                 break;
2334         case NL80211_AUTHTYPE_NETWORK_EAP:
2335                 auth_alg = WLAN_AUTH_LEAP;
2336                 break;
2337         default:
2338                 return -EOPNOTSUPP;
2339         }
2340
2341         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2342         if (!wk)
2343                 return -ENOMEM;
2344
2345         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2346
2347         if (req->ie && req->ie_len) {
2348                 memcpy(wk->ie, req->ie, req->ie_len);
2349                 wk->ie_len = req->ie_len;
2350         }
2351
2352         if (req->key && req->key_len) {
2353                 wk->probe_auth.key_len = req->key_len;
2354                 wk->probe_auth.key_idx = req->key_idx;
2355                 memcpy(wk->probe_auth.key, req->key, req->key_len);
2356         }
2357
2358         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2359         memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
2360         wk->probe_auth.ssid_len = ssid[1];
2361
2362         wk->probe_auth.algorithm = auth_alg;
2363         wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
2364
2365         /* if we already have a probe, don't probe again */
2366         if (req->bss->proberesp_ies)
2367                 wk->type = IEEE80211_WORK_AUTH;
2368         else
2369                 wk->type = IEEE80211_WORK_DIRECT_PROBE;
2370         wk->chan = req->bss->channel;
2371         wk->chan_type = NL80211_CHAN_NO_HT;
2372         wk->sdata = sdata;
2373         wk->done = ieee80211_probe_auth_done;
2374
2375         ieee80211_add_work(wk);
2376         return 0;
2377 }
2378
2379 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
2380                                                   struct sk_buff *skb)
2381 {
2382         struct ieee80211_mgmt *mgmt;
2383         struct ieee80211_rx_status *rx_status;
2384         struct ieee802_11_elems elems;
2385         u16 status;
2386
2387         if (!skb) {
2388                 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
2389                 return WORK_DONE_DESTROY;
2390         }
2391
2392         if (wk->type == IEEE80211_WORK_ASSOC_BEACON_WAIT) {
2393                 mutex_lock(&wk->sdata->u.mgd.mtx);
2394                 rx_status = (void *) skb->cb;
2395                 ieee802_11_parse_elems(skb->data + 24 + 12, skb->len - 24 - 12, &elems);
2396                 ieee80211_rx_bss_info(wk->sdata, (void *)skb->data, skb->len, rx_status,
2397                                       &elems, true);
2398                 mutex_unlock(&wk->sdata->u.mgd.mtx);
2399
2400                 wk->type = IEEE80211_WORK_ASSOC;
2401                 /* not really done yet */
2402                 return WORK_DONE_REQUEUE;
2403         }
2404
2405         mgmt = (void *)skb->data;
2406         status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2407
2408         if (status == WLAN_STATUS_SUCCESS) {
2409                 mutex_lock(&wk->sdata->u.mgd.mtx);
2410                 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
2411                         mutex_unlock(&wk->sdata->u.mgd.mtx);
2412                         /* oops -- internal error -- send timeout for now */
2413                         cfg80211_send_assoc_timeout(wk->sdata->dev,
2414                                                     wk->filter_ta);
2415                         return WORK_DONE_DESTROY;
2416                 }
2417
2418                 mutex_unlock(&wk->sdata->u.mgd.mtx);
2419         }
2420
2421         cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
2422         return WORK_DONE_DESTROY;
2423 }
2424
2425 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2426                         struct cfg80211_assoc_request *req)
2427 {
2428         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2429         struct ieee80211_bss *bss = (void *)req->bss->priv;
2430         struct ieee80211_work *wk;
2431         const u8 *ssid;
2432         int i;
2433
2434         mutex_lock(&ifmgd->mtx);
2435         if (ifmgd->associated) {
2436                 if (!req->prev_bssid ||
2437                     memcmp(req->prev_bssid, ifmgd->associated->bssid,
2438                            ETH_ALEN)) {
2439                         /*
2440                          * We are already associated and the request was not a
2441                          * reassociation request from the current BSS, so
2442                          * reject it.
2443                          */
2444                         mutex_unlock(&ifmgd->mtx);
2445                         return -EALREADY;
2446                 }
2447
2448                 /* Trying to reassociate - clear previous association state */
2449                 ieee80211_set_disassoc(sdata, true, false);
2450         }
2451         mutex_unlock(&ifmgd->mtx);
2452
2453         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2454         if (!wk)
2455                 return -ENOMEM;
2456
2457         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2458         ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
2459
2460         ifmgd->beacon_crc_valid = false;
2461
2462         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2463                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2464                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2465                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2466                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2467
2468
2469         if (req->ie && req->ie_len) {
2470                 memcpy(wk->ie, req->ie, req->ie_len);
2471                 wk->ie_len = req->ie_len;
2472         } else
2473                 wk->ie_len = 0;
2474
2475         wk->assoc.bss = req->bss;
2476
2477         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2478
2479         /* new association always uses requested smps mode */
2480         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
2481                 if (ifmgd->powersave)
2482                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
2483                 else
2484                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
2485         } else
2486                 ifmgd->ap_smps = ifmgd->req_smps;
2487
2488         wk->assoc.smps = ifmgd->ap_smps;
2489         /*
2490          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
2491          * We still associate in non-HT mode (11a/b/g) if any one of these
2492          * ciphers is configured as pairwise.
2493          * We can set this to true for non-11n hardware, that'll be checked
2494          * separately along with the peer capabilities.
2495          */
2496         wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
2497         wk->assoc.capability = req->bss->capability;
2498         wk->assoc.wmm_used = bss->wmm_used;
2499         wk->assoc.supp_rates = bss->supp_rates;
2500         wk->assoc.supp_rates_len = bss->supp_rates_len;
2501         wk->assoc.ht_information_ie =
2502                 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
2503
2504         if (bss->wmm_used && bss->uapsd_supported &&
2505             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
2506                 wk->assoc.uapsd_used = true;
2507                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
2508         } else {
2509                 wk->assoc.uapsd_used = false;
2510                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
2511         }
2512
2513         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2514         memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
2515         wk->assoc.ssid_len = ssid[1];
2516
2517         if (req->prev_bssid)
2518                 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
2519
2520         wk->chan = req->bss->channel;
2521         wk->chan_type = NL80211_CHAN_NO_HT;
2522         wk->sdata = sdata;
2523         wk->done = ieee80211_assoc_done;
2524         if (!bss->dtim_period &&
2525             sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
2526                 wk->type = IEEE80211_WORK_ASSOC_BEACON_WAIT;
2527         else
2528                 wk->type = IEEE80211_WORK_ASSOC;
2529
2530         if (req->use_mfp) {
2531                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2532                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2533         } else {
2534                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2535                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2536         }
2537
2538         if (req->crypto.control_port)
2539                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2540         else
2541                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2542
2543         sdata->control_port_protocol = req->crypto.control_port_ethertype;
2544         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
2545
2546         ieee80211_add_work(wk);
2547         return 0;
2548 }
2549
2550 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2551                          struct cfg80211_deauth_request *req,
2552                          void *cookie)
2553 {
2554         struct ieee80211_local *local = sdata->local;
2555         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2556         struct ieee80211_work *wk;
2557         u8 bssid[ETH_ALEN];
2558         bool assoc_bss = false;
2559
2560         mutex_lock(&ifmgd->mtx);
2561
2562         memcpy(bssid, req->bss->bssid, ETH_ALEN);
2563         if (ifmgd->associated == req->bss) {
2564                 ieee80211_set_disassoc(sdata, false, true);
2565                 mutex_unlock(&ifmgd->mtx);
2566                 assoc_bss = true;
2567         } else {
2568                 bool not_auth_yet = false;
2569
2570                 mutex_unlock(&ifmgd->mtx);
2571
2572                 mutex_lock(&local->mtx);
2573                 list_for_each_entry(wk, &local->work_list, list) {
2574                         if (wk->sdata != sdata)
2575                                 continue;
2576
2577                         if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2578                             wk->type != IEEE80211_WORK_AUTH &&
2579                             wk->type != IEEE80211_WORK_ASSOC &&
2580                             wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
2581                                 continue;
2582
2583                         if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2584                                 continue;
2585
2586                         not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2587                         list_del_rcu(&wk->list);
2588                         free_work(wk);
2589                         break;
2590                 }
2591                 mutex_unlock(&local->mtx);
2592
2593                 /*
2594                  * If somebody requests authentication and we haven't
2595                  * sent out an auth frame yet there's no need to send
2596                  * out a deauth frame either. If the state was PROBE,
2597                  * then this is the case. If it's AUTH we have sent a
2598                  * frame, and if it's IDLE we have completed the auth
2599                  * process already.
2600                  */
2601                 if (not_auth_yet) {
2602                         __cfg80211_auth_canceled(sdata->dev, bssid);
2603                         return 0;
2604                 }
2605         }
2606
2607         printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2608                sdata->name, bssid, req->reason_code);
2609
2610         ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH,
2611                                        req->reason_code, cookie,
2612                                        !req->local_state_change);
2613         if (assoc_bss)
2614                 sta_info_destroy_addr(sdata, bssid);
2615
2616         mutex_lock(&sdata->local->mtx);
2617         ieee80211_recalc_idle(sdata->local);
2618         mutex_unlock(&sdata->local->mtx);
2619
2620         return 0;
2621 }
2622
2623 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2624                            struct cfg80211_disassoc_request *req,
2625                            void *cookie)
2626 {
2627         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2628         u8 bssid[ETH_ALEN];
2629
2630         mutex_lock(&ifmgd->mtx);
2631
2632         /*
2633          * cfg80211 should catch this ... but it's racy since
2634          * we can receive a disassoc frame, process it, hand it
2635          * to cfg80211 while that's in a locked section already
2636          * trying to tell us that the user wants to disconnect.
2637          */
2638         if (ifmgd->associated != req->bss) {
2639                 mutex_unlock(&ifmgd->mtx);
2640                 return -ENOLINK;
2641         }
2642
2643         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2644                sdata->name, req->bss->bssid, req->reason_code);
2645
2646         memcpy(bssid, req->bss->bssid, ETH_ALEN);
2647         ieee80211_set_disassoc(sdata, false, true);
2648
2649         mutex_unlock(&ifmgd->mtx);
2650
2651         ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2652                         IEEE80211_STYPE_DISASSOC, req->reason_code,
2653                         cookie, !req->local_state_change);
2654         sta_info_destroy_addr(sdata, bssid);
2655
2656         mutex_lock(&sdata->local->mtx);
2657         ieee80211_recalc_idle(sdata->local);
2658         mutex_unlock(&sdata->local->mtx);
2659
2660         return 0;
2661 }
2662
2663 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
2664                                enum nl80211_cqm_rssi_threshold_event rssi_event,
2665                                gfp_t gfp)
2666 {
2667         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2668
2669         trace_api_cqm_rssi_notify(sdata, rssi_event);
2670
2671         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
2672 }
2673 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
2674
2675 unsigned char ieee80211_get_operstate(struct ieee80211_vif *vif)
2676 {
2677         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2678         return sdata->dev->operstate;
2679 }
2680 EXPORT_SYMBOL(ieee80211_get_operstate);