8925138736efaa07aa0222442b1024cc2709ab7a
[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.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                                bool beacon_htcap_ie)
165 {
166         struct ieee80211_local *local = sdata->local;
167         struct ieee80211_supported_band *sband;
168         struct sta_info *sta;
169         u32 changed = 0;
170         int hti_cfreq;
171         u16 ht_opmode;
172         bool enable_ht = true;
173         enum nl80211_channel_type prev_chantype;
174         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
175
176         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
177
178         prev_chantype = sdata->vif.bss_conf.channel_type;
179
180         /* HT is not supported */
181         if (!sband->ht_cap.ht_supported)
182                 enable_ht = false;
183
184         if (enable_ht) {
185                 hti_cfreq = ieee80211_channel_to_frequency(hti->control_chan,
186                                                            sband->band);
187                 /* check that channel matches the right operating channel */
188                 if (local->hw.conf.channel->center_freq != hti_cfreq) {
189                         /* Some APs mess this up, evidently.
190                          * Netgear WNDR3700 sometimes reports 4 higher than
191                          * the actual channel, for instance.
192                          */
193                         printk(KERN_DEBUG
194                                "%s: Wrong control channel in association"
195                                " response: configured center-freq: %d"
196                                " hti-cfreq: %d  hti->control_chan: %d"
197                                " band: %d.  Disabling HT.\n",
198                                sdata->name,
199                                local->hw.conf.channel->center_freq,
200                                hti_cfreq, hti->control_chan,
201                                sband->band);
202                         enable_ht = false;
203                 }
204         }
205
206         if (enable_ht) {
207                 channel_type = NL80211_CHAN_HT20;
208
209                 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
210                     !ieee80111_cfg_override_disables_ht40(sdata) &&
211                     (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
212                     (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
213                         switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
214                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
215                                 if (!(local->hw.conf.channel->flags &
216                                     IEEE80211_CHAN_NO_HT40PLUS))
217                                         channel_type = NL80211_CHAN_HT40PLUS;
218                                 break;
219                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
220                                 if (!(local->hw.conf.channel->flags &
221                                     IEEE80211_CHAN_NO_HT40MINUS))
222                                         channel_type = NL80211_CHAN_HT40MINUS;
223                                 break;
224                         }
225                 }
226         }
227
228         if (local->tmp_channel)
229                 local->tmp_channel_type = channel_type;
230
231         if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
232                 /* can only fail due to HT40+/- mismatch */
233                 channel_type = NL80211_CHAN_HT20;
234                 WARN_ON(!ieee80211_set_channel_type(local, sdata, channel_type));
235         }
236
237         if (beacon_htcap_ie && (prev_chantype != channel_type)) {
238                 /*
239                  * Whenever the AP announces the HT mode change that can be
240                  * 40MHz intolerant or etc., it would be safer to stop tx
241                  * queues before doing hw config to avoid buffer overflow.
242                  */
243                 ieee80211_stop_queues_by_reason(&sdata->local->hw,
244                                 IEEE80211_QUEUE_STOP_REASON_CHTYPE_CHANGE);
245
246                 /* flush out all packets */
247                 synchronize_net();
248
249                 drv_flush(local, false);
250         }
251
252         /* channel_type change automatically detected */
253         ieee80211_hw_config(local, 0);
254
255         if (prev_chantype != channel_type) {
256                 rcu_read_lock();
257                 sta = sta_info_get(sdata, bssid);
258                 if (sta)
259                         rate_control_rate_update(local, sband, sta,
260                                                  IEEE80211_RC_HT_CHANGED,
261                                                  channel_type);
262                 rcu_read_unlock();
263
264                 if (beacon_htcap_ie)
265                         ieee80211_wake_queues_by_reason(&sdata->local->hw,
266                                 IEEE80211_QUEUE_STOP_REASON_CHTYPE_CHANGE);
267         }
268
269         ht_opmode = le16_to_cpu(hti->operation_mode);
270
271         /* if bss configuration changed store the new one */
272         if (sdata->ht_opmode_valid != enable_ht ||
273             sdata->vif.bss_conf.ht_operation_mode != ht_opmode ||
274             prev_chantype != channel_type) {
275                 changed |= BSS_CHANGED_HT;
276                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
277                 sdata->ht_opmode_valid = enable_ht;
278         }
279
280         return changed;
281 }
282
283 /* frame sending functions */
284
285 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
286                                            const u8 *bssid, u16 stype, u16 reason,
287                                            void *cookie, bool send_frame)
288 {
289         struct ieee80211_local *local = sdata->local;
290         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
291         struct sk_buff *skb;
292         struct ieee80211_mgmt *mgmt;
293
294         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
295         if (!skb)
296                 return;
297
298         skb_reserve(skb, local->hw.extra_tx_headroom);
299
300         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
301         memset(mgmt, 0, 24);
302         memcpy(mgmt->da, bssid, ETH_ALEN);
303         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
304         memcpy(mgmt->bssid, bssid, ETH_ALEN);
305         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
306         skb_put(skb, 2);
307         /* u.deauth.reason_code == u.disassoc.reason_code */
308         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
309
310         if (stype == IEEE80211_STYPE_DEAUTH)
311                 if (cookie)
312                         __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
313                 else
314                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
315         else
316                 if (cookie)
317                         __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
318                 else
319                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
320         if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
321                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
322
323         if (send_frame)
324                 ieee80211_tx_skb(sdata, skb);
325         else
326                 kfree_skb(skb);
327 }
328
329 void ieee80211_send_pspoll(struct ieee80211_local *local,
330                            struct ieee80211_sub_if_data *sdata)
331 {
332         struct ieee80211_pspoll *pspoll;
333         struct sk_buff *skb;
334
335         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
336         if (!skb)
337                 return;
338
339         pspoll = (struct ieee80211_pspoll *) skb->data;
340         pspoll->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 void ieee80211_send_nullfunc(struct ieee80211_local *local,
347                              struct ieee80211_sub_if_data *sdata,
348                              int powersave)
349 {
350         struct sk_buff *skb;
351         struct ieee80211_hdr_3addr *nullfunc;
352         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
353
354         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
355         if (!skb)
356                 return;
357
358         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
359         if (powersave)
360                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
361
362         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
363         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
364                             IEEE80211_STA_CONNECTION_POLL))
365                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
366
367         ieee80211_tx_skb(sdata, skb);
368 }
369
370 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
371                                           struct ieee80211_sub_if_data *sdata)
372 {
373         struct sk_buff *skb;
374         struct ieee80211_hdr *nullfunc;
375         __le16 fc;
376
377         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
378                 return;
379
380         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
381         if (!skb)
382                 return;
383
384         skb_reserve(skb, local->hw.extra_tx_headroom);
385
386         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
387         memset(nullfunc, 0, 30);
388         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
389                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
390         nullfunc->frame_control = fc;
391         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
392         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
393         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
394         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
395
396         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
397         ieee80211_tx_skb(sdata, skb);
398 }
399
400 /* spectrum management related things */
401 static void ieee80211_chswitch_work(struct work_struct *work)
402 {
403         struct ieee80211_sub_if_data *sdata =
404                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
405         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
406
407         if (!ieee80211_sdata_running(sdata))
408                 return;
409
410         mutex_lock(&ifmgd->mtx);
411         if (!ifmgd->associated)
412                 goto out;
413
414         sdata->local->oper_channel = sdata->local->csa_channel;
415         if (!sdata->local->ops->channel_switch) {
416                 /* call "hw_config" only if doing sw channel switch */
417                 ieee80211_hw_config(sdata->local,
418                         IEEE80211_CONF_CHANGE_CHANNEL);
419         } else {
420                 /* update the device channel directly */
421                 sdata->local->hw.conf.channel = sdata->local->oper_channel;
422         }
423
424         /* XXX: shouldn't really modify cfg80211-owned data! */
425         ifmgd->associated->channel = sdata->local->oper_channel;
426
427         ieee80211_wake_queues_by_reason(&sdata->local->hw,
428                                         IEEE80211_QUEUE_STOP_REASON_CSA);
429  out:
430         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
431         mutex_unlock(&ifmgd->mtx);
432 }
433
434 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
435 {
436         struct ieee80211_sub_if_data *sdata;
437         struct ieee80211_if_managed *ifmgd;
438
439         sdata = vif_to_sdata(vif);
440         ifmgd = &sdata->u.mgd;
441
442         trace_api_chswitch_done(sdata, success);
443         if (!success) {
444                 /*
445                  * If the channel switch was not successful, stay
446                  * around on the old channel. We currently lack
447                  * good handling of this situation, possibly we
448                  * should just drop the association.
449                  */
450                 sdata->local->csa_channel = sdata->local->oper_channel;
451         }
452
453         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
454 }
455 EXPORT_SYMBOL(ieee80211_chswitch_done);
456
457 static void ieee80211_chswitch_timer(unsigned long data)
458 {
459         struct ieee80211_sub_if_data *sdata =
460                 (struct ieee80211_sub_if_data *) data;
461         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
462
463         if (sdata->local->quiescing) {
464                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
465                 return;
466         }
467
468         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
469 }
470
471 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
472                                       struct ieee80211_channel_sw_ie *sw_elem,
473                                       struct ieee80211_bss *bss,
474                                       u64 timestamp)
475 {
476         struct cfg80211_bss *cbss =
477                 container_of((void *)bss, struct cfg80211_bss, priv);
478         struct ieee80211_channel *new_ch;
479         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
480         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num,
481                                                       cbss->channel->band);
482
483         ASSERT_MGD_MTX(ifmgd);
484
485         if (!ifmgd->associated)
486                 return;
487
488         if (sdata->local->scanning)
489                 return;
490
491         /* Disregard subsequent beacons if we are already running a timer
492            processing a CSA */
493
494         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
495                 return;
496
497         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
498         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
499                 return;
500
501         sdata->local->csa_channel = new_ch;
502
503         if (sdata->local->ops->channel_switch) {
504                 /* use driver's channel switch callback */
505                 struct ieee80211_channel_switch ch_switch;
506                 memset(&ch_switch, 0, sizeof(ch_switch));
507                 ch_switch.timestamp = timestamp;
508                 if (sw_elem->mode) {
509                         ch_switch.block_tx = true;
510                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
511                                         IEEE80211_QUEUE_STOP_REASON_CSA);
512                 }
513                 ch_switch.channel = new_ch;
514                 ch_switch.count = sw_elem->count;
515                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
516                 drv_channel_switch(sdata->local, &ch_switch);
517                 return;
518         }
519
520         /* channel switch handled in software */
521         if (sw_elem->count <= 1) {
522                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
523         } else {
524                 if (sw_elem->mode)
525                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
526                                         IEEE80211_QUEUE_STOP_REASON_CSA);
527                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
528                 mod_timer(&ifmgd->chswitch_timer,
529                           jiffies +
530                           msecs_to_jiffies(sw_elem->count *
531                                            cbss->beacon_interval));
532         }
533 }
534
535 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
536                                         u16 capab_info, u8 *pwr_constr_elem,
537                                         u8 pwr_constr_elem_len)
538 {
539         struct ieee80211_conf *conf = &sdata->local->hw.conf;
540
541         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
542                 return;
543
544         /* Power constraint IE length should be 1 octet */
545         if (pwr_constr_elem_len != 1)
546                 return;
547
548         if ((*pwr_constr_elem <= conf->channel->max_power) &&
549             (*pwr_constr_elem != sdata->local->power_constr_level)) {
550                 sdata->local->power_constr_level = *pwr_constr_elem;
551                 ieee80211_hw_config(sdata->local, 0);
552         }
553 }
554
555 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif)
556 {
557         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
558         struct ieee80211_local *local = sdata->local;
559         struct ieee80211_conf *conf = &local->hw.conf;
560
561         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
562                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
563                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
564
565         local->disable_dynamic_ps = false;
566         conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout;
567 }
568 EXPORT_SYMBOL(ieee80211_enable_dyn_ps);
569
570 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif)
571 {
572         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
573         struct ieee80211_local *local = sdata->local;
574         struct ieee80211_conf *conf = &local->hw.conf;
575
576         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
577                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
578                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
579
580         local->disable_dynamic_ps = true;
581         conf->dynamic_ps_timeout = 0;
582         del_timer_sync(&local->dynamic_ps_timer);
583         ieee80211_queue_work(&local->hw,
584                              &local->dynamic_ps_enable_work);
585 }
586 EXPORT_SYMBOL(ieee80211_disable_dyn_ps);
587
588 /* powersave */
589 static void ieee80211_enable_ps(struct ieee80211_local *local,
590                                 struct ieee80211_sub_if_data *sdata)
591 {
592         struct ieee80211_conf *conf = &local->hw.conf;
593
594         /*
595          * If we are scanning right now then the parameters will
596          * take effect when scan finishes.
597          */
598         if (local->scanning)
599                 return;
600
601         if (conf->dynamic_ps_timeout > 0 &&
602             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
603                 mod_timer(&local->dynamic_ps_timer, jiffies +
604                           msecs_to_jiffies(conf->dynamic_ps_timeout));
605         } else {
606                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
607                         ieee80211_send_nullfunc(local, sdata, 1);
608
609                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
610                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
611                         return;
612
613                 conf->flags |= IEEE80211_CONF_PS;
614                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
615         }
616 }
617
618 static void ieee80211_change_ps(struct ieee80211_local *local)
619 {
620         struct ieee80211_conf *conf = &local->hw.conf;
621
622         if (local->ps_sdata) {
623                 ieee80211_enable_ps(local, local->ps_sdata);
624         } else if (conf->flags & IEEE80211_CONF_PS) {
625                 conf->flags &= ~IEEE80211_CONF_PS;
626                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
627                 del_timer_sync(&local->dynamic_ps_timer);
628                 cancel_work_sync(&local->dynamic_ps_enable_work);
629         }
630 }
631
632 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
633 {
634         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
635         struct sta_info *sta = NULL;
636         bool authorized = false;
637
638         if (!mgd->powersave)
639                 return false;
640
641         if (mgd->broken_ap)
642                 return false;
643
644         if (!mgd->associated)
645                 return false;
646
647         if (!mgd->associated->beacon_ies)
648                 return false;
649
650         if (mgd->flags & (IEEE80211_STA_BEACON_POLL |
651                           IEEE80211_STA_CONNECTION_POLL))
652                 return false;
653
654         rcu_read_lock();
655         sta = sta_info_get(sdata, mgd->bssid);
656         if (sta)
657                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
658         rcu_read_unlock();
659
660         return authorized;
661 }
662
663 /* need to hold RTNL or interface lock */
664 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
665 {
666         struct ieee80211_sub_if_data *sdata, *found = NULL;
667         int count = 0;
668         int timeout;
669
670         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
671                 local->ps_sdata = NULL;
672                 return;
673         }
674
675         if (!list_empty(&local->work_list)) {
676                 local->ps_sdata = NULL;
677                 goto change;
678         }
679
680         list_for_each_entry(sdata, &local->interfaces, list) {
681                 if (!ieee80211_sdata_running(sdata))
682                         continue;
683                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
684                         /* If an AP vif is found, then disable PS
685                          * by setting the count to zero thereby setting
686                          * ps_sdata to NULL.
687                          */
688                         count = 0;
689                         break;
690                 }
691                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
692                         continue;
693                 found = sdata;
694                 count++;
695         }
696
697         if (count == 1 && ieee80211_powersave_allowed(found)) {
698                 struct ieee80211_conf *conf = &local->hw.conf;
699                 s32 beaconint_us;
700
701                 if (latency < 0)
702                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
703
704                 beaconint_us = ieee80211_tu_to_usec(
705                                         found->vif.bss_conf.beacon_int);
706
707                 timeout = local->dynamic_ps_forced_timeout;
708                 if (timeout < 0) {
709                         /*
710                          * Go to full PSM if the user configures a very low
711                          * latency requirement.
712                          * The 2000 second value is there for compatibility
713                          * until the PM_QOS_NETWORK_LATENCY is configured
714                          * with real values.
715                          */
716                         if (latency > (1900 * USEC_PER_MSEC) &&
717                             latency != (2000 * USEC_PER_SEC))
718                                 timeout = 0;
719                         else
720                                 timeout = 100;
721                 }
722                 local->dynamic_ps_user_timeout = timeout;
723                 if (!local->disable_dynamic_ps)
724                         conf->dynamic_ps_timeout =
725                                 local->dynamic_ps_user_timeout;
726
727                 if (beaconint_us > latency) {
728                         local->ps_sdata = NULL;
729                 } else {
730                         struct ieee80211_bss *bss;
731                         int maxslp = 1;
732                         u8 dtimper;
733
734                         bss = (void *)found->u.mgd.associated->priv;
735                         dtimper = bss->dtim_period;
736
737                         /* If the TIM IE is invalid, pretend the value is 1 */
738                         if (!dtimper)
739                                 dtimper = 1;
740                         else if (dtimper > 1)
741                                 maxslp = min_t(int, dtimper,
742                                                     latency / beaconint_us);
743
744                         local->hw.conf.max_sleep_period = maxslp;
745                         local->hw.conf.ps_dtim_period = dtimper;
746                         local->ps_sdata = found;
747                 }
748         } else {
749                 local->ps_sdata = NULL;
750         }
751
752  change:
753         ieee80211_change_ps(local);
754 }
755
756 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
757 {
758         struct ieee80211_local *local =
759                 container_of(work, struct ieee80211_local,
760                              dynamic_ps_disable_work);
761
762         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
763                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
764                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
765         }
766
767         ieee80211_wake_queues_by_reason(&local->hw,
768                                         IEEE80211_QUEUE_STOP_REASON_PS);
769 }
770
771 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
772 {
773         struct ieee80211_local *local =
774                 container_of(work, struct ieee80211_local,
775                              dynamic_ps_enable_work);
776         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
777         struct ieee80211_if_managed *ifmgd;
778         unsigned long flags;
779         int q;
780
781         /* can only happen when PS was just disabled anyway */
782         if (!sdata)
783                 return;
784
785         ifmgd = &sdata->u.mgd;
786
787         if (local->hw.conf.flags & IEEE80211_CONF_PS)
788                 return;
789
790         if (!local->disable_dynamic_ps &&
791             local->hw.conf.dynamic_ps_timeout > 0) {
792                 /* don't enter PS if TX frames are pending */
793                 if (drv_tx_frames_pending(local)) {
794                         mod_timer(&local->dynamic_ps_timer, jiffies +
795                                   msecs_to_jiffies(
796                                   local->hw.conf.dynamic_ps_timeout));
797                         return;
798                 }
799
800                 /*
801                  * transmission can be stopped by others which leads to
802                  * dynamic_ps_timer expiry. Postpone the ps timer if it
803                  * is not the actual idle state.
804                  */
805                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
806                 for (q = 0; q < local->hw.queues; q++) {
807                         if (local->queue_stop_reasons[q]) {
808                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
809                                                        flags);
810                                 mod_timer(&local->dynamic_ps_timer, jiffies +
811                                           msecs_to_jiffies(
812                                           local->hw.conf.dynamic_ps_timeout));
813                                 return;
814                         }
815                 }
816                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
817         }
818
819         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
820             (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED))) {
821                 netif_tx_stop_all_queues(sdata->dev);
822
823                 if (drv_tx_frames_pending(local))
824                         mod_timer(&local->dynamic_ps_timer, jiffies +
825                                   msecs_to_jiffies(
826                                   local->hw.conf.dynamic_ps_timeout));
827                 else {
828                         ieee80211_send_nullfunc(local, sdata, 1);
829                         /* Flush to get the tx status of nullfunc frame */
830                         drv_flush(local, false);
831                 }
832         }
833
834         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
835               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
836             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
837                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
838                 local->hw.conf.flags |= IEEE80211_CONF_PS;
839                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
840         }
841
842         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
843                 netif_tx_wake_all_queues(sdata->dev);
844 }
845
846 void ieee80211_dynamic_ps_timer(unsigned long data)
847 {
848         struct ieee80211_local *local = (void *) data;
849
850         if (local->quiescing || local->suspended)
851                 return;
852
853         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
854 }
855
856 /* MLME */
857 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
858                                      struct ieee80211_sub_if_data *sdata,
859                                      u8 *wmm_param, size_t wmm_param_len)
860 {
861         struct ieee80211_tx_queue_params params;
862         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
863         size_t left;
864         int count;
865         u8 *pos, uapsd_queues = 0;
866
867         if (!local->ops->conf_tx)
868                 return;
869
870         if (local->hw.queues < 4)
871                 return;
872
873         if (!wmm_param)
874                 return;
875
876         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
877                 return;
878
879         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
880                 uapsd_queues = local->uapsd_queues;
881
882         count = wmm_param[6] & 0x0f;
883         if (count == ifmgd->wmm_last_param_set)
884                 return;
885         ifmgd->wmm_last_param_set = count;
886
887         pos = wmm_param + 8;
888         left = wmm_param_len - 8;
889
890         memset(&params, 0, sizeof(params));
891
892         local->wmm_acm = 0;
893         for (; left >= 4; left -= 4, pos += 4) {
894                 int aci = (pos[0] >> 5) & 0x03;
895                 int acm = (pos[0] >> 4) & 0x01;
896                 bool uapsd = false;
897                 int queue;
898
899                 switch (aci) {
900                 case 1: /* AC_BK */
901                         queue = 3;
902                         if (acm)
903                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
904                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
905                                 uapsd = true;
906                         break;
907                 case 2: /* AC_VI */
908                         queue = 1;
909                         if (acm)
910                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
911                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
912                                 uapsd = true;
913                         break;
914                 case 3: /* AC_VO */
915                         queue = 0;
916                         if (acm)
917                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
918                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
919                                 uapsd = true;
920                         break;
921                 case 0: /* AC_BE */
922                 default:
923                         queue = 2;
924                         if (acm)
925                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
926                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
927                                 uapsd = true;
928                         break;
929                 }
930
931                 params.aifs = pos[0] & 0x0f;
932                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
933                 params.cw_min = ecw2cw(pos[1] & 0x0f);
934                 params.txop = get_unaligned_le16(pos + 2);
935                 params.uapsd = uapsd;
936
937 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
938                 wiphy_debug(local->hw.wiphy,
939                             "WMM queue=%d aci=%d acm=%d aifs=%d "
940                             "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
941                             queue, aci, acm,
942                             params.aifs, params.cw_min, params.cw_max,
943                             params.txop, params.uapsd);
944 #endif
945                 sdata->tx_conf[queue] = params;
946                 if (drv_conf_tx(local, sdata, queue, &params))
947                         wiphy_debug(local->hw.wiphy,
948                                     "failed to set TX queue parameters for queue %d\n",
949                                     queue);
950         }
951
952         /* enable WMM or activate new settings */
953         sdata->vif.bss_conf.qos = true;
954         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
955 }
956
957 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
958                                            u16 capab, bool erp_valid, u8 erp)
959 {
960         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
961         u32 changed = 0;
962         bool use_protection;
963         bool use_short_preamble;
964         bool use_short_slot;
965
966         if (erp_valid) {
967                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
968                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
969         } else {
970                 use_protection = false;
971                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
972         }
973
974         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
975         if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
976                 use_short_slot = true;
977
978         if (use_protection != bss_conf->use_cts_prot) {
979                 bss_conf->use_cts_prot = use_protection;
980                 changed |= BSS_CHANGED_ERP_CTS_PROT;
981         }
982
983         if (use_short_preamble != bss_conf->use_short_preamble) {
984                 bss_conf->use_short_preamble = use_short_preamble;
985                 changed |= BSS_CHANGED_ERP_PREAMBLE;
986         }
987
988         if (use_short_slot != bss_conf->use_short_slot) {
989                 bss_conf->use_short_slot = use_short_slot;
990                 changed |= BSS_CHANGED_ERP_SLOT;
991         }
992
993         return changed;
994 }
995
996 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
997                                      struct cfg80211_bss *cbss,
998                                      u32 bss_info_changed)
999 {
1000         struct ieee80211_bss *bss = (void *)cbss->priv;
1001         struct ieee80211_local *local = sdata->local;
1002         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1003
1004         bss_info_changed |= BSS_CHANGED_ASSOC;
1005         /* set timing information */
1006         bss_conf->beacon_int = cbss->beacon_interval;
1007         bss_conf->timestamp = cbss->tsf;
1008
1009         bss_info_changed |= BSS_CHANGED_BEACON_INT;
1010         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1011                 cbss->capability, bss->has_erp_value, bss->erp_value);
1012
1013         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1014                 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int));
1015
1016         sdata->u.mgd.associated = cbss;
1017         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1018
1019         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1020
1021         /* just to be sure */
1022         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1023                                 IEEE80211_STA_BEACON_POLL);
1024
1025         ieee80211_led_assoc(local, 1);
1026
1027         if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
1028                 bss_conf->dtim_period = bss->dtim_period;
1029         else
1030                 bss_conf->dtim_period = 0;
1031
1032         bss_conf->assoc = 1;
1033         /*
1034          * For now just always ask the driver to update the basic rateset
1035          * when we have associated, we aren't checking whether it actually
1036          * changed or not.
1037          */
1038         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
1039
1040         /* And the BSSID changed - we're associated now */
1041         bss_info_changed |= BSS_CHANGED_BSSID;
1042
1043         /* Tell the driver to monitor connection quality (if supported) */
1044         if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) &&
1045             bss_conf->cqm_rssi_thold)
1046                 bss_info_changed |= BSS_CHANGED_CQM;
1047
1048         /* Enable ARP filtering */
1049         if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
1050                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
1051                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1052         }
1053
1054         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1055
1056         mutex_lock(&local->iflist_mtx);
1057         ieee80211_recalc_ps(local, -1);
1058         ieee80211_recalc_smps(local);
1059         mutex_unlock(&local->iflist_mtx);
1060
1061         netif_tx_start_all_queues(sdata->dev);
1062         netif_carrier_on(sdata->dev);
1063 }
1064
1065 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1066                                    bool remove_sta, bool tx)
1067 {
1068         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1069         struct ieee80211_local *local = sdata->local;
1070         struct sta_info *sta;
1071         u32 changed = 0, config_changed = 0;
1072         u8 bssid[ETH_ALEN];
1073
1074         ASSERT_MGD_MTX(ifmgd);
1075
1076         if (WARN_ON(!ifmgd->associated))
1077                 return;
1078
1079         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1080
1081         ifmgd->associated = NULL;
1082         memset(ifmgd->bssid, 0, ETH_ALEN);
1083
1084         /*
1085          * we need to commit the associated = NULL change because the
1086          * scan code uses that to determine whether this iface should
1087          * go to/wake up from powersave or not -- and could otherwise
1088          * wake the queues erroneously.
1089          */
1090         smp_mb();
1091
1092         /*
1093          * Thus, we can only afterwards stop the queues -- to account
1094          * for the case where another CPU is finishing a scan at this
1095          * time -- we don't want the scan code to enable queues.
1096          */
1097
1098         netif_tx_stop_all_queues(sdata->dev);
1099         netif_carrier_off(sdata->dev);
1100
1101         mutex_lock(&local->sta_mtx);
1102         sta = sta_info_get(sdata, bssid);
1103         if (sta) {
1104                 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
1105                 ieee80211_sta_tear_down_BA_sessions(sta, tx);
1106         }
1107         mutex_unlock(&local->sta_mtx);
1108
1109         changed |= ieee80211_reset_erp_info(sdata);
1110
1111         ieee80211_led_assoc(local, 0);
1112         changed |= BSS_CHANGED_ASSOC;
1113         sdata->vif.bss_conf.assoc = false;
1114
1115         ieee80211_set_wmm_default(sdata);
1116
1117         /* channel(_type) changes are handled by ieee80211_hw_config */
1118         WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
1119
1120         /* on the next assoc, re-program HT parameters */
1121         sdata->ht_opmode_valid = false;
1122         memset(&ifmgd->ht_capa, 0, sizeof(ifmgd->ht_capa));
1123         memset(&ifmgd->ht_capa_mask, 0, sizeof(ifmgd->ht_capa_mask));
1124
1125         local->power_constr_level = 0;
1126
1127         del_timer_sync(&local->dynamic_ps_timer);
1128         cancel_work_sync(&local->dynamic_ps_enable_work);
1129
1130         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1131                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1132                 config_changed |= IEEE80211_CONF_CHANGE_PS;
1133         }
1134         local->ps_sdata = NULL;
1135
1136         ieee80211_hw_config(local, config_changed);
1137
1138         /* Disable ARP filtering */
1139         if (sdata->vif.bss_conf.arp_filter_enabled) {
1140                 sdata->vif.bss_conf.arp_filter_enabled = false;
1141                 changed |= BSS_CHANGED_ARP_FILTER;
1142         }
1143
1144         /* The BSSID (not really interesting) and HT changed */
1145         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1146         ieee80211_bss_info_change_notify(sdata, changed);
1147
1148         /* remove AP and TDLS peers */
1149         if (remove_sta)
1150                 sta_info_flush(local, sdata);
1151
1152         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1153         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1154         del_timer_sync(&sdata->u.mgd.timer);
1155         del_timer_sync(&sdata->u.mgd.chswitch_timer);
1156 }
1157
1158 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1159                              struct ieee80211_hdr *hdr)
1160 {
1161         /*
1162          * We can postpone the mgd.timer whenever receiving unicast frames
1163          * from AP because we know that the connection is working both ways
1164          * at that time. But multicast frames (and hence also beacons) must
1165          * be ignored here, because we need to trigger the timer during
1166          * data idle periods for sending the periodic probe request to the
1167          * AP we're connected to.
1168          */
1169         if (is_multicast_ether_addr(hdr->addr1))
1170                 return;
1171
1172         ieee80211_sta_reset_conn_monitor(sdata);
1173 }
1174
1175 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1176 {
1177         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1178
1179         if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1180                               IEEE80211_STA_CONNECTION_POLL)))
1181             return;
1182
1183         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1184                           IEEE80211_STA_BEACON_POLL);
1185         mutex_lock(&sdata->local->iflist_mtx);
1186         ieee80211_recalc_ps(sdata->local, -1);
1187         mutex_unlock(&sdata->local->iflist_mtx);
1188
1189         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1190                 return;
1191
1192         /*
1193          * We've received a probe response, but are not sure whether
1194          * we have or will be receiving any beacons or data, so let's
1195          * schedule the timers again, just in case.
1196          */
1197         ieee80211_sta_reset_beacon_monitor(sdata);
1198
1199         mod_timer(&ifmgd->conn_mon_timer,
1200                   round_jiffies_up(jiffies +
1201                                    IEEE80211_CONNECTION_IDLE_TIME));
1202 }
1203
1204 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1205                              struct ieee80211_hdr *hdr, bool ack)
1206 {
1207         if (!ieee80211_is_data(hdr->frame_control))
1208             return;
1209
1210         if (ack)
1211                 ieee80211_sta_reset_conn_monitor(sdata);
1212
1213         if (ieee80211_is_nullfunc(hdr->frame_control) &&
1214             sdata->u.mgd.probe_send_count > 0) {
1215                 if (ack)
1216                         sdata->u.mgd.probe_send_count = 0;
1217                 else
1218                         sdata->u.mgd.nullfunc_failed = true;
1219                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1220         }
1221 }
1222
1223 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1224 {
1225         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1226         const u8 *ssid;
1227         u8 *dst = ifmgd->associated->bssid;
1228         u8 unicast_limit = max(1, max_probe_tries - 3);
1229
1230         /*
1231          * Try sending broadcast probe requests for the last three
1232          * probe requests after the first ones failed since some
1233          * buggy APs only support broadcast probe requests.
1234          */
1235         if (ifmgd->probe_send_count >= unicast_limit)
1236                 dst = NULL;
1237
1238         /*
1239          * When the hardware reports an accurate Tx ACK status, it's
1240          * better to send a nullfunc frame instead of a probe request,
1241          * as it will kick us off the AP quickly if we aren't associated
1242          * anymore. The timeout will be reset if the frame is ACKed by
1243          * the AP.
1244          */
1245         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1246                 ifmgd->nullfunc_failed = false;
1247                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1248         } else {
1249                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1250                 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid[1], NULL, 0,
1251                                          (u32) -1, true, false);
1252         }
1253
1254         ifmgd->probe_send_count++;
1255         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1256         run_again(ifmgd, ifmgd->probe_timeout);
1257 }
1258
1259 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1260                                    bool beacon)
1261 {
1262         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1263         bool already = false;
1264
1265         if (!ieee80211_sdata_running(sdata))
1266                 return;
1267
1268         if (sdata->local->scanning)
1269                 return;
1270
1271         if (sdata->local->tmp_channel)
1272                 return;
1273
1274         mutex_lock(&ifmgd->mtx);
1275
1276         if (!ifmgd->associated)
1277                 goto out;
1278
1279 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1280         if (beacon && net_ratelimit())
1281                 printk(KERN_DEBUG "%s: detected beacon loss from AP "
1282                        "- sending probe request\n", sdata->name);
1283 #endif
1284
1285         /*
1286          * The driver/our work has already reported this event or the
1287          * connection monitoring has kicked in and we have already sent
1288          * a probe request. Or maybe the AP died and the driver keeps
1289          * reporting until we disassociate...
1290          *
1291          * In either case we have to ignore the current call to this
1292          * function (except for setting the correct probe reason bit)
1293          * because otherwise we would reset the timer every time and
1294          * never check whether we received a probe response!
1295          */
1296         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1297                             IEEE80211_STA_CONNECTION_POLL))
1298                 already = true;
1299
1300         if (beacon)
1301                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1302         else
1303                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1304
1305         if (already)
1306                 goto out;
1307
1308         mutex_lock(&sdata->local->iflist_mtx);
1309         ieee80211_recalc_ps(sdata->local, -1);
1310         mutex_unlock(&sdata->local->iflist_mtx);
1311
1312         ifmgd->probe_send_count = 0;
1313         ieee80211_mgd_probe_ap_send(sdata);
1314  out:
1315         mutex_unlock(&ifmgd->mtx);
1316 }
1317
1318 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
1319                                           struct ieee80211_vif *vif)
1320 {
1321         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1322         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1323         struct sk_buff *skb;
1324         const u8 *ssid;
1325
1326         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1327                 return NULL;
1328
1329         ASSERT_MGD_MTX(ifmgd);
1330
1331         if (!ifmgd->associated)
1332                 return NULL;
1333
1334         ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1335         skb = ieee80211_build_probe_req(sdata, ifmgd->associated->bssid,
1336                                         (u32) -1, ssid + 2, ssid[1],
1337                                         NULL, 0, true);
1338
1339         return skb;
1340 }
1341 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
1342
1343 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
1344 {
1345         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1346         struct ieee80211_local *local = sdata->local;
1347         u8 bssid[ETH_ALEN];
1348
1349         mutex_lock(&ifmgd->mtx);
1350         if (!ifmgd->associated) {
1351                 mutex_unlock(&ifmgd->mtx);
1352                 return;
1353         }
1354
1355         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1356
1357         printk(KERN_DEBUG "%s: Connection to AP %pM lost.\n",
1358                sdata->name, bssid);
1359
1360         ieee80211_set_disassoc(sdata, true, true);
1361         mutex_unlock(&ifmgd->mtx);
1362
1363         /*
1364          * must be outside lock due to cfg80211,
1365          * but that's not a problem.
1366          */
1367         ieee80211_send_deauth_disassoc(sdata, bssid,
1368                                        IEEE80211_STYPE_DEAUTH,
1369                                        WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1370                                        NULL, true);
1371
1372         mutex_lock(&local->mtx);
1373         ieee80211_recalc_idle(local);
1374         mutex_unlock(&local->mtx);
1375 }
1376
1377 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1378 {
1379         struct ieee80211_sub_if_data *sdata =
1380                 container_of(work, struct ieee80211_sub_if_data,
1381                              u.mgd.beacon_connection_loss_work);
1382
1383         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1384                 __ieee80211_connection_loss(sdata);
1385         else
1386                 ieee80211_mgd_probe_ap(sdata, true);
1387 }
1388
1389 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1390 {
1391         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1392         struct ieee80211_hw *hw = &sdata->local->hw;
1393
1394         trace_api_beacon_loss(sdata);
1395
1396         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1397         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1398 }
1399 EXPORT_SYMBOL(ieee80211_beacon_loss);
1400
1401 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1402 {
1403         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1404         struct ieee80211_hw *hw = &sdata->local->hw;
1405
1406         trace_api_connection_loss(sdata);
1407
1408         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1409         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1410 }
1411 EXPORT_SYMBOL(ieee80211_connection_loss);
1412
1413
1414 static enum rx_mgmt_action __must_check
1415 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1416                          struct ieee80211_mgmt *mgmt, size_t len)
1417 {
1418         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1419         const u8 *bssid = NULL;
1420         u16 reason_code;
1421
1422         if (len < 24 + 2)
1423                 return RX_MGMT_NONE;
1424
1425         ASSERT_MGD_MTX(ifmgd);
1426
1427         bssid = ifmgd->associated->bssid;
1428
1429         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1430
1431         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1432                         sdata->name, bssid, reason_code);
1433
1434         ieee80211_set_disassoc(sdata, true, false);
1435         mutex_lock(&sdata->local->mtx);
1436         ieee80211_recalc_idle(sdata->local);
1437         mutex_unlock(&sdata->local->mtx);
1438
1439         return RX_MGMT_CFG80211_DEAUTH;
1440 }
1441
1442
1443 static enum rx_mgmt_action __must_check
1444 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1445                            struct ieee80211_mgmt *mgmt, size_t len)
1446 {
1447         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1448         u16 reason_code;
1449
1450         if (len < 24 + 2)
1451                 return RX_MGMT_NONE;
1452
1453         ASSERT_MGD_MTX(ifmgd);
1454
1455         if (WARN_ON(!ifmgd->associated))
1456                 return RX_MGMT_NONE;
1457
1458         if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
1459                 return RX_MGMT_NONE;
1460
1461         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1462
1463         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1464                         sdata->name, mgmt->sa, reason_code);
1465
1466         ieee80211_set_disassoc(sdata, true, false);
1467         mutex_lock(&sdata->local->mtx);
1468         ieee80211_recalc_idle(sdata->local);
1469         mutex_unlock(&sdata->local->mtx);
1470         return RX_MGMT_CFG80211_DISASSOC;
1471 }
1472
1473 static void ieee80211_get_rates(struct ieee80211_supported_band *sband,
1474                                 u8 *supp_rates, unsigned int supp_rates_len,
1475                                 u32 *rates, u32 *basic_rates,
1476                                 bool *have_higher_than_11mbit,
1477                                 int *min_rate, int *min_rate_index)
1478 {
1479         int i, j;
1480
1481         for (i = 0; i < supp_rates_len; i++) {
1482                 int rate = (supp_rates[i] & 0x7f) * 5;
1483                 bool is_basic = !!(supp_rates[i] & 0x80);
1484
1485                 if (rate > 110)
1486                         *have_higher_than_11mbit = true;
1487
1488                 /*
1489                  * BSS_MEMBERSHIP_SELECTOR_HT_PHY is defined in 802.11n-2009
1490                  * 7.3.2.2 as a magic value instead of a rate. Hence, skip it.
1491                  *
1492                  * Note: Even through the membership selector and the basic
1493                  *       rate flag share the same bit, they are not exactly
1494                  *       the same.
1495                  */
1496                 if (!!(supp_rates[i] & 0x80) &&
1497                     (supp_rates[i] & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1498                         continue;
1499
1500                 for (j = 0; j < sband->n_bitrates; j++) {
1501                         if (sband->bitrates[j].bitrate == rate) {
1502                                 *rates |= BIT(j);
1503                                 if (is_basic)
1504                                         *basic_rates |= BIT(j);
1505                                 if (rate < *min_rate) {
1506                                         *min_rate = rate;
1507                                         *min_rate_index = j;
1508                                 }
1509                                 break;
1510                         }
1511                 }
1512         }
1513 }
1514
1515 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1516                                     struct ieee80211_mgmt *mgmt, size_t len)
1517 {
1518         struct ieee80211_sub_if_data *sdata = wk->sdata;
1519         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1520         struct ieee80211_local *local = sdata->local;
1521         struct ieee80211_supported_band *sband;
1522         struct sta_info *sta;
1523         struct cfg80211_bss *cbss = wk->assoc.bss;
1524         u8 *pos;
1525         u32 rates, basic_rates;
1526         u16 capab_info, aid;
1527         struct ieee802_11_elems elems;
1528         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1529         u32 changed = 0;
1530         int err;
1531         bool have_higher_than_11mbit = false;
1532         u16 ap_ht_cap_flags;
1533         int min_rate = INT_MAX, min_rate_index = -1;
1534
1535         /* AssocResp and ReassocResp have identical structure */
1536
1537         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1538         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1539
1540         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1541                 printk(KERN_DEBUG
1542                        "%s: invalid AID value 0x%x; bits 15:14 not set\n",
1543                        sdata->name, aid);
1544         aid &= ~(BIT(15) | BIT(14));
1545
1546         ifmgd->broken_ap = false;
1547
1548         if (aid == 0 || aid > IEEE80211_MAX_AID) {
1549                 printk(KERN_DEBUG
1550                        "%s: invalid AID value %d (out of range), turn off PS\n",
1551                        sdata->name, aid);
1552                 aid = 0;
1553                 ifmgd->broken_ap = true;
1554         }
1555
1556         pos = mgmt->u.assoc_resp.variable;
1557         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1558
1559         if (!elems.supp_rates) {
1560                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1561                        sdata->name);
1562                 return false;
1563         }
1564
1565         ifmgd->aid = aid;
1566
1567         mutex_lock(&sdata->local->sta_mtx);
1568         /*
1569          * station info was already allocated and inserted before
1570          * the association and should be available to us
1571          */
1572         sta = sta_info_get_rx(sdata, cbss->bssid);
1573         if (WARN_ON(!sta)) {
1574                 mutex_unlock(&sdata->local->sta_mtx);
1575                 return false;
1576         }
1577
1578         set_sta_flag(sta, WLAN_STA_AUTH);
1579         set_sta_flag(sta, WLAN_STA_ASSOC);
1580         if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1581                 set_sta_flag(sta, WLAN_STA_AUTHORIZED);
1582
1583         rates = 0;
1584         basic_rates = 0;
1585         sband = local->hw.wiphy->bands[wk->chan->band];
1586
1587         ieee80211_get_rates(sband, elems.supp_rates, elems.supp_rates_len,
1588                             &rates, &basic_rates, &have_higher_than_11mbit,
1589                             &min_rate, &min_rate_index);
1590
1591         ieee80211_get_rates(sband, elems.ext_supp_rates,
1592                             elems.ext_supp_rates_len, &rates, &basic_rates,
1593                             &have_higher_than_11mbit,
1594                             &min_rate, &min_rate_index);
1595
1596         /*
1597          * some buggy APs don't advertise basic_rates. use the lowest
1598          * supported rate instead.
1599          */
1600         if (unlikely(!basic_rates) && min_rate_index >= 0) {
1601                 printk(KERN_DEBUG "%s: No basic rates in AssocResp. "
1602                        "Using min supported rate instead.\n", sdata->name);
1603                 basic_rates = BIT(min_rate_index);
1604         }
1605
1606         sta->sta.supp_rates[wk->chan->band] = rates;
1607         sdata->vif.bss_conf.basic_rates = basic_rates;
1608
1609         /* cf. IEEE 802.11 9.2.12 */
1610         if (wk->chan->band == IEEE80211_BAND_2GHZ &&
1611             have_higher_than_11mbit)
1612                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1613         else
1614                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1615
1616         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1617                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
1618                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1619
1620         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1621
1622         rate_control_rate_init(sta);
1623
1624         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1625                 set_sta_flag(sta, WLAN_STA_MFP);
1626
1627         if (elems.wmm_param)
1628                 set_sta_flag(sta, WLAN_STA_WME);
1629
1630         /* sta_info_reinsert will also unlock the mutex lock */
1631         err = sta_info_reinsert(sta);
1632         sta = NULL;
1633         if (err) {
1634                 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1635                        " the AP (error %d)\n", sdata->name, err);
1636                 return false;
1637         }
1638
1639         /*
1640          * Always handle WMM once after association regardless
1641          * of the first value the AP uses. Setting -1 here has
1642          * that effect because the AP values is an unsigned
1643          * 4-bit value.
1644          */
1645         ifmgd->wmm_last_param_set = -1;
1646
1647         if (elems.wmm_param)
1648                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1649                                          elems.wmm_param_len);
1650         else
1651                 ieee80211_set_wmm_default(sdata);
1652
1653         local->oper_channel = wk->chan;
1654
1655         if (elems.ht_info_elem && elems.wmm_param &&
1656             (sdata->local->hw.queues >= 4) &&
1657             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1658                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1659                                                cbss->bssid, ap_ht_cap_flags,
1660                                                false);
1661
1662         /* set AID and assoc capability,
1663          * ieee80211_set_associated() will tell the driver */
1664         bss_conf->aid = aid;
1665         bss_conf->assoc_capability = capab_info;
1666         ieee80211_set_associated(sdata, cbss, changed);
1667
1668         /*
1669          * If we're using 4-addr mode, let the AP know that we're
1670          * doing so, so that it can create the STA VLAN on its side
1671          */
1672         if (ifmgd->use_4addr)
1673                 ieee80211_send_4addr_nullfunc(local, sdata);
1674
1675         /*
1676          * Start timer to probe the connection to the AP now.
1677          * Also start the timer that will detect beacon loss.
1678          */
1679         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1680         ieee80211_sta_reset_beacon_monitor(sdata);
1681
1682         return true;
1683 }
1684
1685
1686 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1687                                   struct ieee80211_mgmt *mgmt,
1688                                   size_t len,
1689                                   struct ieee80211_rx_status *rx_status,
1690                                   struct ieee802_11_elems *elems,
1691                                   bool beacon)
1692 {
1693         struct ieee80211_local *local = sdata->local;
1694         int freq;
1695         struct ieee80211_bss *bss;
1696         struct ieee80211_channel *channel;
1697         bool need_ps = false;
1698
1699         if (sdata->u.mgd.associated) {
1700                 bss = (void *)sdata->u.mgd.associated->priv;
1701                 /* not previously set so we may need to recalc */
1702                 need_ps = !bss->dtim_period;
1703         }
1704
1705         if (elems->ds_params && elems->ds_params_len == 1)
1706                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
1707                                                       rx_status->band);
1708         else
1709                 freq = rx_status->freq;
1710
1711         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1712
1713         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1714                 return;
1715
1716         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1717                                         channel, beacon);
1718         if (bss)
1719                 ieee80211_rx_bss_put(local, bss);
1720
1721         if (!sdata->u.mgd.associated)
1722                 return;
1723
1724         if (need_ps) {
1725                 mutex_lock(&local->iflist_mtx);
1726                 ieee80211_recalc_ps(local, -1);
1727                 mutex_unlock(&local->iflist_mtx);
1728         }
1729
1730         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1731             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1732                                                         ETH_ALEN) == 0)) {
1733                 struct ieee80211_channel_sw_ie *sw_elem =
1734                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1735                 ieee80211_sta_process_chanswitch(sdata, sw_elem,
1736                                                  bss, rx_status->mactime);
1737         }
1738 }
1739
1740
1741 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1742                                          struct sk_buff *skb)
1743 {
1744         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1745         struct ieee80211_if_managed *ifmgd;
1746         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1747         size_t baselen, len = skb->len;
1748         struct ieee802_11_elems elems;
1749
1750         ifmgd = &sdata->u.mgd;
1751
1752         ASSERT_MGD_MTX(ifmgd);
1753
1754         if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1755                 return; /* ignore ProbeResp to foreign address */
1756
1757         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1758         if (baselen > len)
1759                 return;
1760
1761         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1762                                 &elems);
1763
1764         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1765
1766         if (ifmgd->associated &&
1767             memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0)
1768                 ieee80211_reset_ap_probe(sdata);
1769 }
1770
1771 /*
1772  * This is the canonical list of information elements we care about,
1773  * the filter code also gives us all changes to the Microsoft OUI
1774  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1775  *
1776  * We implement beacon filtering in software since that means we can
1777  * avoid processing the frame here and in cfg80211, and userspace
1778  * will not be able to tell whether the hardware supports it or not.
1779  *
1780  * XXX: This list needs to be dynamic -- userspace needs to be able to
1781  *      add items it requires. It also needs to be able to tell us to
1782  *      look out for other vendor IEs.
1783  */
1784 static const u64 care_about_ies =
1785         (1ULL << WLAN_EID_COUNTRY) |
1786         (1ULL << WLAN_EID_ERP_INFO) |
1787         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1788         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1789         (1ULL << WLAN_EID_HT_CAPABILITY) |
1790         (1ULL << WLAN_EID_HT_INFORMATION);
1791
1792 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1793                                      struct ieee80211_mgmt *mgmt,
1794                                      size_t len,
1795                                      struct ieee80211_rx_status *rx_status)
1796 {
1797         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1798         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1799         size_t baselen;
1800         struct ieee802_11_elems elems;
1801         struct ieee80211_local *local = sdata->local;
1802         u32 changed = 0;
1803         bool erp_valid, directed_tim = false;
1804         u8 erp_value = 0;
1805         u32 ncrc;
1806         u8 *bssid;
1807
1808         ASSERT_MGD_MTX(ifmgd);
1809
1810         /* Process beacon from the current BSS */
1811         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1812         if (baselen > len)
1813                 return;
1814
1815         if (rx_status->freq != local->hw.conf.channel->center_freq)
1816                 return;
1817
1818         /*
1819          * We might have received a number of frames, among them a
1820          * disassoc frame and a beacon...
1821          */
1822         if (!ifmgd->associated)
1823                 return;
1824
1825         bssid = ifmgd->associated->bssid;
1826
1827         /*
1828          * And in theory even frames from a different AP we were just
1829          * associated to a split-second ago!
1830          */
1831         if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1832                 return;
1833
1834         /* Track average RSSI from the Beacon frames of the current AP */
1835         ifmgd->last_beacon_signal = rx_status->signal;
1836         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
1837                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
1838                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
1839                 ifmgd->last_cqm_event_signal = 0;
1840                 ifmgd->count_beacon_signal = 1;
1841                 ifmgd->last_ave_beacon_signal = 0;
1842         } else {
1843                 ifmgd->ave_beacon_signal =
1844                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
1845                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
1846                          ifmgd->ave_beacon_signal) / 16;
1847                 ifmgd->count_beacon_signal++;
1848         }
1849
1850         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
1851             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
1852                 int sig = ifmgd->ave_beacon_signal;
1853                 int last_sig = ifmgd->last_ave_beacon_signal;
1854
1855                 /*
1856                  * if signal crosses either of the boundaries, invoke callback
1857                  * with appropriate parameters
1858                  */
1859                 if (sig > ifmgd->rssi_max_thold &&
1860                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
1861                         ifmgd->last_ave_beacon_signal = sig;
1862                         drv_rssi_callback(local, RSSI_EVENT_HIGH);
1863                 } else if (sig < ifmgd->rssi_min_thold &&
1864                            (last_sig >= ifmgd->rssi_max_thold ||
1865                            last_sig == 0)) {
1866                         ifmgd->last_ave_beacon_signal = sig;
1867                         drv_rssi_callback(local, RSSI_EVENT_LOW);
1868                 }
1869         }
1870
1871         if (bss_conf->cqm_rssi_thold &&
1872             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
1873             !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) {
1874                 int sig = ifmgd->ave_beacon_signal / 16;
1875                 int last_event = ifmgd->last_cqm_event_signal;
1876                 int thold = bss_conf->cqm_rssi_thold;
1877                 int hyst = bss_conf->cqm_rssi_hyst;
1878                 if (sig < thold &&
1879                     (last_event == 0 || sig < last_event - hyst)) {
1880                         ifmgd->last_cqm_event_signal = sig;
1881                         ieee80211_cqm_rssi_notify(
1882                                 &sdata->vif,
1883                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
1884                                 GFP_KERNEL);
1885                 } else if (sig > thold &&
1886                            (last_event == 0 || sig > last_event + hyst)) {
1887                         ifmgd->last_cqm_event_signal = sig;
1888                         ieee80211_cqm_rssi_notify(
1889                                 &sdata->vif,
1890                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
1891                                 GFP_KERNEL);
1892                 }
1893         }
1894
1895         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1896 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1897                 if (net_ratelimit()) {
1898                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1899                                "to a received beacon\n", sdata->name);
1900                 }
1901 #endif
1902                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1903                 mutex_lock(&local->iflist_mtx);
1904                 ieee80211_recalc_ps(local, -1);
1905                 mutex_unlock(&local->iflist_mtx);
1906         }
1907
1908         /*
1909          * Push the beacon loss detection into the future since
1910          * we are processing a beacon from the AP just now.
1911          */
1912         ieee80211_sta_reset_beacon_monitor(sdata);
1913
1914         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1915         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1916                                           len - baselen, &elems,
1917                                           care_about_ies, ncrc);
1918
1919         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1920                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1921                                                    ifmgd->aid);
1922
1923         if (ncrc != ifmgd->beacon_crc || !ifmgd->beacon_crc_valid) {
1924                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1925                                       true);
1926
1927                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1928                                          elems.wmm_param_len);
1929         }
1930
1931         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1932                 if (directed_tim) {
1933                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1934                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1935                                 ieee80211_hw_config(local,
1936                                                     IEEE80211_CONF_CHANGE_PS);
1937                                 ieee80211_send_nullfunc(local, sdata, 0);
1938                         } else {
1939                                 local->pspolling = true;
1940
1941                                 /*
1942                                  * Here is assumed that the driver will be
1943                                  * able to send ps-poll frame and receive a
1944                                  * response even though power save mode is
1945                                  * enabled, but some drivers might require
1946                                  * to disable power save here. This needs
1947                                  * to be investigated.
1948                                  */
1949                                 ieee80211_send_pspoll(local, sdata);
1950                         }
1951                 }
1952         }
1953
1954         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
1955                 return;
1956         ifmgd->beacon_crc = ncrc;
1957         ifmgd->beacon_crc_valid = true;
1958
1959         if (elems.erp_info && elems.erp_info_len >= 1) {
1960                 erp_valid = true;
1961                 erp_value = elems.erp_info[0];
1962         } else {
1963                 erp_valid = false;
1964         }
1965         changed |= ieee80211_handle_bss_capability(sdata,
1966                         le16_to_cpu(mgmt->u.beacon.capab_info),
1967                         erp_valid, erp_value);
1968
1969
1970         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1971             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1972                 struct sta_info *sta;
1973                 struct ieee80211_supported_band *sband;
1974                 u16 ap_ht_cap_flags;
1975
1976                 rcu_read_lock();
1977
1978                 sta = sta_info_get(sdata, bssid);
1979                 if (WARN_ON(!sta)) {
1980                         rcu_read_unlock();
1981                         return;
1982                 }
1983
1984                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1985
1986                 ieee80211_ht_cap_ie_to_sta_ht_cap(sdata, sband,
1987                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1988
1989                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1990
1991                 rcu_read_unlock();
1992
1993                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1994                                                bssid, ap_ht_cap_flags, true);
1995         }
1996
1997         /* Note: country IE parsing is done for us by cfg80211 */
1998         if (elems.country_elem) {
1999                 /* TODO: IBSS also needs this */
2000                 if (elems.pwr_constr_elem)
2001                         ieee80211_handle_pwr_constr(sdata,
2002                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
2003                                 elems.pwr_constr_elem,
2004                                 elems.pwr_constr_elem_len);
2005         }
2006
2007         ieee80211_bss_info_change_notify(sdata, changed);
2008 }
2009
2010 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
2011                                   struct sk_buff *skb)
2012 {
2013         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2014         struct ieee80211_rx_status *rx_status;
2015         struct ieee80211_mgmt *mgmt;
2016         enum rx_mgmt_action rma = RX_MGMT_NONE;
2017         u16 fc;
2018
2019         rx_status = (struct ieee80211_rx_status *) skb->cb;
2020         mgmt = (struct ieee80211_mgmt *) skb->data;
2021         fc = le16_to_cpu(mgmt->frame_control);
2022
2023         mutex_lock(&ifmgd->mtx);
2024
2025         if (ifmgd->associated &&
2026             memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
2027                 switch (fc & IEEE80211_FCTL_STYPE) {
2028                 case IEEE80211_STYPE_BEACON:
2029                         ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
2030                                                  rx_status);
2031                         break;
2032                 case IEEE80211_STYPE_PROBE_RESP:
2033                         ieee80211_rx_mgmt_probe_resp(sdata, skb);
2034                         break;
2035                 case IEEE80211_STYPE_DEAUTH:
2036                         rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
2037                         break;
2038                 case IEEE80211_STYPE_DISASSOC:
2039                         rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
2040                         break;
2041                 case IEEE80211_STYPE_ACTION:
2042                         switch (mgmt->u.action.category) {
2043                         case WLAN_CATEGORY_SPECTRUM_MGMT:
2044                                 ieee80211_sta_process_chanswitch(sdata,
2045                                                 &mgmt->u.action.u.chan_switch.sw_elem,
2046                                                 (void *)ifmgd->associated->priv,
2047                                                 rx_status->mactime);
2048                                 break;
2049                         }
2050                 }
2051                 mutex_unlock(&ifmgd->mtx);
2052
2053                 switch (rma) {
2054                 case RX_MGMT_NONE:
2055                         /* no action */
2056                         break;
2057                 case RX_MGMT_CFG80211_DEAUTH:
2058                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
2059                         break;
2060                 case RX_MGMT_CFG80211_DISASSOC:
2061                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
2062                         break;
2063                 default:
2064                         WARN(1, "unexpected: %d", rma);
2065                 }
2066                 return;
2067         }
2068
2069         mutex_unlock(&ifmgd->mtx);
2070
2071         if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
2072             (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH) {
2073                 struct ieee80211_local *local = sdata->local;
2074                 struct ieee80211_work *wk;
2075
2076                 mutex_lock(&local->mtx);
2077                 list_for_each_entry(wk, &local->work_list, list) {
2078                         if (wk->sdata != sdata)
2079                                 continue;
2080
2081                         if (wk->type != IEEE80211_WORK_ASSOC &&
2082                             wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
2083                                 continue;
2084
2085                         if (memcmp(mgmt->bssid, wk->filter_ta, ETH_ALEN))
2086                                 continue;
2087                         if (memcmp(mgmt->sa, wk->filter_ta, ETH_ALEN))
2088                                 continue;
2089
2090                         /*
2091                          * Printing the message only here means we can't
2092                          * spuriously print it, but it also means that it
2093                          * won't be printed when the frame comes in before
2094                          * we even tried to associate or in similar cases.
2095                          *
2096                          * Ultimately, I suspect cfg80211 should print the
2097                          * messages instead.
2098                          */
2099                         printk(KERN_DEBUG
2100                                "%s: deauthenticated from %pM (Reason: %u)\n",
2101                                sdata->name, mgmt->bssid,
2102                                le16_to_cpu(mgmt->u.deauth.reason_code));
2103
2104                         list_del_rcu(&wk->list);
2105                         free_work(wk);
2106                         break;
2107                 }
2108                 mutex_unlock(&local->mtx);
2109
2110                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
2111         }
2112 }
2113
2114 static void ieee80211_sta_timer(unsigned long data)
2115 {
2116         struct ieee80211_sub_if_data *sdata =
2117                 (struct ieee80211_sub_if_data *) data;
2118         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2119         struct ieee80211_local *local = sdata->local;
2120
2121         if (local->quiescing) {
2122                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2123                 return;
2124         }
2125
2126         ieee80211_queue_work(&local->hw, &sdata->work);
2127 }
2128
2129 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
2130                                           u8 *bssid, u8 reason)
2131 {
2132         struct ieee80211_local *local = sdata->local;
2133         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2134
2135         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
2136                           IEEE80211_STA_BEACON_POLL);
2137
2138         ieee80211_set_disassoc(sdata, true, true);
2139         mutex_unlock(&ifmgd->mtx);
2140         /*
2141          * must be outside lock due to cfg80211,
2142          * but that's not a problem.
2143          */
2144         ieee80211_send_deauth_disassoc(sdata, bssid,
2145                         IEEE80211_STYPE_DEAUTH, reason,
2146                         NULL, true);
2147
2148         mutex_lock(&local->mtx);
2149         ieee80211_recalc_idle(local);
2150         mutex_unlock(&local->mtx);
2151
2152         mutex_lock(&ifmgd->mtx);
2153 }
2154
2155 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
2156 {
2157         struct ieee80211_local *local = sdata->local;
2158         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2159
2160         /* then process the rest of the work */
2161         mutex_lock(&ifmgd->mtx);
2162
2163         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2164                             IEEE80211_STA_CONNECTION_POLL) &&
2165             ifmgd->associated) {
2166                 u8 bssid[ETH_ALEN];
2167                 int max_tries;
2168
2169                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
2170
2171                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2172                         max_tries = max_nullfunc_tries;
2173                 else
2174                         max_tries = max_probe_tries;
2175
2176                 /* ACK received for nullfunc probing frame */
2177                 if (!ifmgd->probe_send_count)
2178                         ieee80211_reset_ap_probe(sdata);
2179                 else if (ifmgd->nullfunc_failed) {
2180                         if (ifmgd->probe_send_count < max_tries) {
2181 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2182                                 wiphy_debug(local->hw.wiphy,
2183                                             "%s: No ack for nullfunc frame to"
2184                                             " AP %pM, try %d/%i\n",
2185                                             sdata->name, bssid,
2186                                             ifmgd->probe_send_count, max_tries);
2187 #endif
2188                                 ieee80211_mgd_probe_ap_send(sdata);
2189                         } else {
2190 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2191                                 wiphy_debug(local->hw.wiphy,
2192                                             "%s: No ack for nullfunc frame to"
2193                                             " AP %pM, disconnecting.\n",
2194                                             sdata->name, bssid);
2195 #endif
2196                                 ieee80211_sta_connection_lost(sdata, bssid,
2197                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2198                         }
2199                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
2200                         run_again(ifmgd, ifmgd->probe_timeout);
2201                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2202 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2203                         wiphy_debug(local->hw.wiphy,
2204                                     "%s: Failed to send nullfunc to AP %pM"
2205                                     " after %dms, disconnecting.\n",
2206                                     sdata->name,
2207                                     bssid, probe_wait_ms);
2208 #endif
2209                         ieee80211_sta_connection_lost(sdata, bssid,
2210                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2211                 } else if (ifmgd->probe_send_count < max_tries) {
2212 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2213                         wiphy_debug(local->hw.wiphy,
2214                                     "%s: No probe response from AP %pM"
2215                                     " after %dms, try %d/%i\n",
2216                                     sdata->name,
2217                                     bssid, probe_wait_ms,
2218                                     ifmgd->probe_send_count, max_tries);
2219 #endif
2220                         ieee80211_mgd_probe_ap_send(sdata);
2221                 } else {
2222                         /*
2223                          * We actually lost the connection ... or did we?
2224                          * Let's make sure!
2225                          */
2226                         wiphy_debug(local->hw.wiphy,
2227                                     "%s: No probe response from AP %pM"
2228                                     " after %dms, disconnecting.\n",
2229                                     sdata->name,
2230                                     bssid, probe_wait_ms);
2231
2232                         ieee80211_sta_connection_lost(sdata, bssid,
2233                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2234                 }
2235         }
2236
2237         mutex_unlock(&ifmgd->mtx);
2238 }
2239
2240 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
2241 {
2242         struct ieee80211_sub_if_data *sdata =
2243                 (struct ieee80211_sub_if_data *) data;
2244         struct ieee80211_local *local = sdata->local;
2245
2246         if (local->quiescing)
2247                 return;
2248
2249         ieee80211_queue_work(&sdata->local->hw,
2250                              &sdata->u.mgd.beacon_connection_loss_work);
2251 }
2252
2253 static void ieee80211_sta_conn_mon_timer(unsigned long data)
2254 {
2255         struct ieee80211_sub_if_data *sdata =
2256                 (struct ieee80211_sub_if_data *) data;
2257         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2258         struct ieee80211_local *local = sdata->local;
2259
2260         if (local->quiescing)
2261                 return;
2262
2263         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
2264 }
2265
2266 static void ieee80211_sta_monitor_work(struct work_struct *work)
2267 {
2268         struct ieee80211_sub_if_data *sdata =
2269                 container_of(work, struct ieee80211_sub_if_data,
2270                              u.mgd.monitor_work);
2271
2272         ieee80211_mgd_probe_ap(sdata, false);
2273 }
2274
2275 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2276 {
2277         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2278                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
2279                                         IEEE80211_STA_CONNECTION_POLL);
2280
2281                 /* let's probe the connection once */
2282                 ieee80211_queue_work(&sdata->local->hw,
2283                            &sdata->u.mgd.monitor_work);
2284                 /* and do all the other regular work too */
2285                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2286         }
2287 }
2288
2289 #ifdef CONFIG_PM
2290 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2291 {
2292         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2293
2294         /*
2295          * we need to use atomic bitops for the running bits
2296          * only because both timers might fire at the same
2297          * time -- the code here is properly synchronised.
2298          */
2299
2300         cancel_work_sync(&ifmgd->request_smps_work);
2301
2302         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
2303         if (del_timer_sync(&ifmgd->timer))
2304                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2305
2306         cancel_work_sync(&ifmgd->chswitch_work);
2307         if (del_timer_sync(&ifmgd->chswitch_timer))
2308                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2309
2310         cancel_work_sync(&ifmgd->monitor_work);
2311         /* these will just be re-established on connection */
2312         del_timer_sync(&ifmgd->conn_mon_timer);
2313         del_timer_sync(&ifmgd->bcn_mon_timer);
2314 }
2315
2316 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2317 {
2318         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2319
2320         if (!ifmgd->associated)
2321                 return;
2322
2323         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
2324                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
2325                 mutex_lock(&ifmgd->mtx);
2326                 if (ifmgd->associated) {
2327 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2328                         wiphy_debug(sdata->local->hw.wiphy,
2329                                     "%s: driver requested disconnect after resume.\n",
2330                                     sdata->name);
2331 #endif
2332                         ieee80211_sta_connection_lost(sdata,
2333                                 ifmgd->associated->bssid,
2334                                 WLAN_REASON_UNSPECIFIED);
2335                         mutex_unlock(&ifmgd->mtx);
2336                         return;
2337                 }
2338                 mutex_unlock(&ifmgd->mtx);
2339         }
2340
2341         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2342                 add_timer(&ifmgd->timer);
2343         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2344                 add_timer(&ifmgd->chswitch_timer);
2345         ieee80211_sta_reset_beacon_monitor(sdata);
2346         ieee80211_restart_sta_timer(sdata);
2347         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.monitor_work);
2348 }
2349 #endif
2350
2351 /* interface setup */
2352 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2353 {
2354         struct ieee80211_if_managed *ifmgd;
2355
2356         ifmgd = &sdata->u.mgd;
2357         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
2358         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2359         INIT_WORK(&ifmgd->beacon_connection_loss_work,
2360                   ieee80211_beacon_connection_loss_work);
2361         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
2362         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2363                     (unsigned long) sdata);
2364         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
2365                     (unsigned long) sdata);
2366         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
2367                     (unsigned long) sdata);
2368         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2369                     (unsigned long) sdata);
2370
2371         ifmgd->flags = 0;
2372
2373         mutex_init(&ifmgd->mtx);
2374
2375         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
2376                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
2377         else
2378                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
2379 }
2380
2381 /* scan finished notification */
2382 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2383 {
2384         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2385
2386         /* Restart STA timers */
2387         rcu_read_lock();
2388         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2389                 ieee80211_restart_sta_timer(sdata);
2390         rcu_read_unlock();
2391 }
2392
2393 int ieee80211_max_network_latency(struct notifier_block *nb,
2394                                   unsigned long data, void *dummy)
2395 {
2396         s32 latency_usec = (s32) data;
2397         struct ieee80211_local *local =
2398                 container_of(nb, struct ieee80211_local,
2399                              network_latency_notifier);
2400
2401         mutex_lock(&local->iflist_mtx);
2402         ieee80211_recalc_ps(local, latency_usec);
2403         mutex_unlock(&local->iflist_mtx);
2404
2405         return 0;
2406 }
2407
2408 /* config hooks */
2409 static enum work_done_result
2410 ieee80211_probe_auth_done(struct ieee80211_work *wk,
2411                           struct sk_buff *skb)
2412 {
2413         struct ieee80211_local *local = wk->sdata->local;
2414
2415         if (!skb) {
2416                 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
2417                 goto destroy;
2418         }
2419
2420         if (wk->type == IEEE80211_WORK_AUTH) {
2421                 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
2422                 goto destroy;
2423         }
2424
2425         mutex_lock(&wk->sdata->u.mgd.mtx);
2426         ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
2427         mutex_unlock(&wk->sdata->u.mgd.mtx);
2428
2429         wk->type = IEEE80211_WORK_AUTH;
2430         wk->probe_auth.tries = 0;
2431         return WORK_DONE_REQUEUE;
2432  destroy:
2433         if (wk->probe_auth.synced)
2434                 drv_finish_tx_sync(local, wk->sdata, wk->filter_ta,
2435                                    IEEE80211_TX_SYNC_AUTH);
2436
2437         return WORK_DONE_DESTROY;
2438 }
2439
2440 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
2441                        struct cfg80211_auth_request *req)
2442 {
2443         const u8 *ssid;
2444         struct ieee80211_work *wk;
2445         u16 auth_alg;
2446
2447         if (req->local_state_change)
2448                 return 0; /* no need to update mac80211 state */
2449
2450         switch (req->auth_type) {
2451         case NL80211_AUTHTYPE_OPEN_SYSTEM:
2452                 auth_alg = WLAN_AUTH_OPEN;
2453                 break;
2454         case NL80211_AUTHTYPE_SHARED_KEY:
2455                 if (IS_ERR(sdata->local->wep_tx_tfm))
2456                         return -EOPNOTSUPP;
2457                 auth_alg = WLAN_AUTH_SHARED_KEY;
2458                 break;
2459         case NL80211_AUTHTYPE_FT:
2460                 auth_alg = WLAN_AUTH_FT;
2461                 break;
2462         case NL80211_AUTHTYPE_NETWORK_EAP:
2463                 auth_alg = WLAN_AUTH_LEAP;
2464                 break;
2465         default:
2466                 return -EOPNOTSUPP;
2467         }
2468
2469         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2470         if (!wk)
2471                 return -ENOMEM;
2472
2473         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2474
2475         if (req->ie && req->ie_len) {
2476                 memcpy(wk->ie, req->ie, req->ie_len);
2477                 wk->ie_len = req->ie_len;
2478         }
2479
2480         if (req->key && req->key_len) {
2481                 wk->probe_auth.key_len = req->key_len;
2482                 wk->probe_auth.key_idx = req->key_idx;
2483                 memcpy(wk->probe_auth.key, req->key, req->key_len);
2484         }
2485
2486         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2487         memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
2488         wk->probe_auth.ssid_len = ssid[1];
2489
2490         wk->probe_auth.algorithm = auth_alg;
2491         wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
2492
2493         /* if we already have a probe, don't probe again */
2494         if (req->bss->proberesp_ies)
2495                 wk->type = IEEE80211_WORK_AUTH;
2496         else
2497                 wk->type = IEEE80211_WORK_DIRECT_PROBE;
2498         wk->chan = req->bss->channel;
2499         wk->chan_type = NL80211_CHAN_NO_HT;
2500         wk->sdata = sdata;
2501         wk->done = ieee80211_probe_auth_done;
2502
2503         ieee80211_add_work(wk);
2504         return 0;
2505 }
2506
2507 /* create and insert a dummy station entry */
2508 static int ieee80211_pre_assoc(struct ieee80211_sub_if_data *sdata,
2509                                 u8 *bssid) {
2510         struct sta_info *sta;
2511         int err;
2512
2513         sta = sta_info_alloc(sdata, bssid, GFP_KERNEL);
2514         if (!sta)
2515                 return -ENOMEM;
2516
2517         sta->dummy = true;
2518
2519         err = sta_info_insert(sta);
2520         sta = NULL;
2521         if (err) {
2522                 printk(KERN_DEBUG "%s: failed to insert Dummy STA entry for"
2523                        " the AP (error %d)\n", sdata->name, err);
2524                 return err;
2525         }
2526
2527         return 0;
2528 }
2529
2530 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
2531                                                   struct sk_buff *skb)
2532 {
2533         struct ieee80211_local *local = wk->sdata->local;
2534         struct ieee80211_mgmt *mgmt;
2535         struct ieee80211_rx_status *rx_status;
2536         struct ieee802_11_elems elems;
2537         struct cfg80211_bss *cbss = wk->assoc.bss;
2538         u16 status;
2539
2540         if (!skb) {
2541                 sta_info_destroy_addr(wk->sdata, cbss->bssid);
2542                 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
2543                 goto destroy;
2544         }
2545
2546         if (wk->type == IEEE80211_WORK_ASSOC_BEACON_WAIT) {
2547                 mutex_lock(&wk->sdata->u.mgd.mtx);
2548                 rx_status = (void *) skb->cb;
2549                 ieee802_11_parse_elems(skb->data + 24 + 12, skb->len - 24 - 12, &elems);
2550                 ieee80211_rx_bss_info(wk->sdata, (void *)skb->data, skb->len, rx_status,
2551                                       &elems, true);
2552                 mutex_unlock(&wk->sdata->u.mgd.mtx);
2553
2554                 wk->type = IEEE80211_WORK_ASSOC;
2555                 /* not really done yet */
2556                 return WORK_DONE_REQUEUE;
2557         }
2558
2559         mgmt = (void *)skb->data;
2560         status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2561
2562         if (status == WLAN_STATUS_SUCCESS) {
2563                 if (wk->assoc.synced)
2564                         drv_finish_tx_sync(local, wk->sdata, wk->filter_ta,
2565                                            IEEE80211_TX_SYNC_ASSOC);
2566
2567                 mutex_lock(&wk->sdata->u.mgd.mtx);
2568                 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
2569                         mutex_unlock(&wk->sdata->u.mgd.mtx);
2570                         /* oops -- internal error -- send timeout for now */
2571                         sta_info_destroy_addr(wk->sdata, cbss->bssid);
2572                         cfg80211_send_assoc_timeout(wk->sdata->dev,
2573                                                     wk->filter_ta);
2574                         return WORK_DONE_DESTROY;
2575                 }
2576
2577                 mutex_unlock(&wk->sdata->u.mgd.mtx);
2578         } else {
2579                 /* assoc failed - destroy the dummy station entry */
2580                 sta_info_destroy_addr(wk->sdata, cbss->bssid);
2581         }
2582
2583         cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
2584  destroy:
2585         if (wk->assoc.synced)
2586                 drv_finish_tx_sync(local, wk->sdata, wk->filter_ta,
2587                                    IEEE80211_TX_SYNC_ASSOC);
2588
2589         return WORK_DONE_DESTROY;
2590 }
2591
2592 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2593                         struct cfg80211_assoc_request *req)
2594 {
2595         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2596         struct ieee80211_bss *bss = (void *)req->bss->priv;
2597         struct ieee80211_work *wk;
2598         const u8 *ssid;
2599         int i, err;
2600
2601         mutex_lock(&ifmgd->mtx);
2602         if (ifmgd->associated) {
2603                 if (!req->prev_bssid ||
2604                     memcmp(req->prev_bssid, ifmgd->associated->bssid,
2605                            ETH_ALEN)) {
2606                         /*
2607                          * We are already associated and the request was not a
2608                          * reassociation request from the current BSS, so
2609                          * reject it.
2610                          */
2611                         mutex_unlock(&ifmgd->mtx);
2612                         return -EALREADY;
2613                 }
2614
2615                 /* Trying to reassociate - clear previous association state */
2616                 ieee80211_set_disassoc(sdata, true, false);
2617         }
2618         mutex_unlock(&ifmgd->mtx);
2619
2620         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2621         if (!wk)
2622                 return -ENOMEM;
2623
2624         /*
2625          * create a dummy station info entry in order
2626          * to start accepting incoming EAPOL packets from the station
2627          */
2628         err = ieee80211_pre_assoc(sdata, req->bss->bssid);
2629         if (err) {
2630                 kfree(wk);
2631                 return err;
2632         }
2633
2634         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2635         ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
2636
2637         ifmgd->beacon_crc_valid = false;
2638
2639         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2640                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2641                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2642                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2643                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2644
2645
2646         if (req->flags & ASSOC_REQ_DISABLE_HT)
2647                 ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2648
2649         memcpy(&ifmgd->ht_capa, &req->ht_capa, sizeof(ifmgd->ht_capa));
2650         memcpy(&ifmgd->ht_capa_mask, &req->ht_capa_mask,
2651                sizeof(ifmgd->ht_capa_mask));
2652
2653         if (req->ie && req->ie_len) {
2654                 memcpy(wk->ie, req->ie, req->ie_len);
2655                 wk->ie_len = req->ie_len;
2656         } else
2657                 wk->ie_len = 0;
2658
2659         wk->assoc.bss = req->bss;
2660
2661         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2662
2663         /* new association always uses requested smps mode */
2664         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
2665                 if (ifmgd->powersave)
2666                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
2667                 else
2668                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
2669         } else
2670                 ifmgd->ap_smps = ifmgd->req_smps;
2671
2672         wk->assoc.smps = ifmgd->ap_smps;
2673         /*
2674          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
2675          * We still associate in non-HT mode (11a/b/g) if any one of these
2676          * ciphers is configured as pairwise.
2677          * We can set this to true for non-11n hardware, that'll be checked
2678          * separately along with the peer capabilities.
2679          */
2680         wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
2681         wk->assoc.capability = req->bss->capability;
2682         wk->assoc.wmm_used = bss->wmm_used;
2683         wk->assoc.supp_rates = bss->supp_rates;
2684         wk->assoc.supp_rates_len = bss->supp_rates_len;
2685         wk->assoc.ht_information_ie =
2686                 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
2687
2688         if (bss->wmm_used && bss->uapsd_supported &&
2689             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
2690                 wk->assoc.uapsd_used = true;
2691                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
2692         } else {
2693                 wk->assoc.uapsd_used = false;
2694                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
2695         }
2696
2697         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2698         memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
2699         wk->assoc.ssid_len = ssid[1];
2700
2701         if (req->prev_bssid)
2702                 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
2703
2704         wk->chan = req->bss->channel;
2705         wk->chan_type = NL80211_CHAN_NO_HT;
2706         wk->sdata = sdata;
2707         wk->done = ieee80211_assoc_done;
2708         if (!bss->dtim_period &&
2709             sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
2710                 wk->type = IEEE80211_WORK_ASSOC_BEACON_WAIT;
2711         else
2712                 wk->type = IEEE80211_WORK_ASSOC;
2713
2714         if (req->use_mfp) {
2715                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2716                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2717         } else {
2718                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2719                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2720         }
2721
2722         if (req->crypto.control_port)
2723                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2724         else
2725                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2726
2727         sdata->control_port_protocol = req->crypto.control_port_ethertype;
2728         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
2729
2730         ieee80211_add_work(wk);
2731         return 0;
2732 }
2733
2734 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2735                          struct cfg80211_deauth_request *req,
2736                          void *cookie)
2737 {
2738         struct ieee80211_local *local = sdata->local;
2739         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2740         struct ieee80211_work *wk;
2741         u8 bssid[ETH_ALEN];
2742         bool assoc_bss = false;
2743
2744         mutex_lock(&ifmgd->mtx);
2745
2746         memcpy(bssid, req->bss->bssid, ETH_ALEN);
2747         if (ifmgd->associated == req->bss) {
2748                 ieee80211_set_disassoc(sdata, false, true);
2749                 mutex_unlock(&ifmgd->mtx);
2750                 assoc_bss = true;
2751         } else {
2752                 bool not_auth_yet = false;
2753
2754                 mutex_unlock(&ifmgd->mtx);
2755
2756                 mutex_lock(&local->mtx);
2757                 list_for_each_entry(wk, &local->work_list, list) {
2758                         if (wk->sdata != sdata)
2759                                 continue;
2760
2761                         if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2762                             wk->type != IEEE80211_WORK_AUTH &&
2763                             wk->type != IEEE80211_WORK_ASSOC &&
2764                             wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
2765                                 continue;
2766
2767                         if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2768                                 continue;
2769
2770                         not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2771                         list_del_rcu(&wk->list);
2772                         free_work(wk);
2773                         break;
2774                 }
2775                 mutex_unlock(&local->mtx);
2776
2777                 /*
2778                  * If somebody requests authentication and we haven't
2779                  * sent out an auth frame yet there's no need to send
2780                  * out a deauth frame either. If the state was PROBE,
2781                  * then this is the case. If it's AUTH we have sent a
2782                  * frame, and if it's IDLE we have completed the auth
2783                  * process already.
2784                  */
2785                 if (not_auth_yet) {
2786                         __cfg80211_auth_canceled(sdata->dev, bssid);
2787                         return 0;
2788                 }
2789         }
2790
2791         printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2792                sdata->name, bssid, req->reason_code);
2793
2794         ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH,
2795                                        req->reason_code, cookie,
2796                                        !req->local_state_change);
2797         if (assoc_bss)
2798                 sta_info_flush(sdata->local, sdata);
2799
2800         mutex_lock(&sdata->local->mtx);
2801         ieee80211_recalc_idle(sdata->local);
2802         mutex_unlock(&sdata->local->mtx);
2803
2804         return 0;
2805 }
2806
2807 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2808                            struct cfg80211_disassoc_request *req,
2809                            void *cookie)
2810 {
2811         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2812         u8 bssid[ETH_ALEN];
2813
2814         mutex_lock(&ifmgd->mtx);
2815
2816         /*
2817          * cfg80211 should catch this ... but it's racy since
2818          * we can receive a disassoc frame, process it, hand it
2819          * to cfg80211 while that's in a locked section already
2820          * trying to tell us that the user wants to disconnect.
2821          */
2822         if (ifmgd->associated != req->bss) {
2823                 mutex_unlock(&ifmgd->mtx);
2824                 return -ENOLINK;
2825         }
2826
2827         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2828                sdata->name, req->bss->bssid, req->reason_code);
2829
2830         memcpy(bssid, req->bss->bssid, ETH_ALEN);
2831         ieee80211_set_disassoc(sdata, false, true);
2832
2833         mutex_unlock(&ifmgd->mtx);
2834
2835         ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2836                         IEEE80211_STYPE_DISASSOC, req->reason_code,
2837                         cookie, !req->local_state_change);
2838         sta_info_flush(sdata->local, sdata);
2839
2840         mutex_lock(&sdata->local->mtx);
2841         ieee80211_recalc_idle(sdata->local);
2842         mutex_unlock(&sdata->local->mtx);
2843
2844         return 0;
2845 }
2846
2847 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
2848                                enum nl80211_cqm_rssi_threshold_event rssi_event,
2849                                gfp_t gfp)
2850 {
2851         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2852
2853         trace_api_cqm_rssi_notify(sdata, rssi_event);
2854
2855         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
2856 }
2857 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
2858
2859 unsigned char ieee80211_get_operstate(struct ieee80211_vif *vif)
2860 {
2861         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2862         return sdata->dev->operstate;
2863 }
2864 EXPORT_SYMBOL(ieee80211_get_operstate);