mac80211: wait for beacon before enabling powersave
[linux-2.6.git] / net / mac80211 / mlme.c
1 /*
2  * BSS client mode implementation
3  * Copyright 2003-2008, Jouni Malinen <j@w1.fi>
4  * Copyright 2004, Instant802 Networks, Inc.
5  * Copyright 2005, Devicescape Software, Inc.
6  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
7  * Copyright 2007, Michael Wu <flamingice@sourmilk.net>
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License version 2 as
11  * published by the Free Software Foundation.
12  */
13
14 #include <linux/delay.h>
15 #include <linux/if_ether.h>
16 #include <linux/skbuff.h>
17 #include <linux/if_arp.h>
18 #include <linux/etherdevice.h>
19 #include <linux/rtnetlink.h>
20 #include <linux/pm_qos_params.h>
21 #include <linux/crc32.h>
22 #include <net/mac80211.h>
23 #include <asm/unaligned.h>
24
25 #include "ieee80211_i.h"
26 #include "driver-ops.h"
27 #include "rate.h"
28 #include "led.h"
29
30 #define IEEE80211_AUTH_TIMEOUT (HZ / 5)
31 #define IEEE80211_AUTH_MAX_TRIES 3
32 #define IEEE80211_ASSOC_TIMEOUT (HZ / 5)
33 #define IEEE80211_ASSOC_MAX_TRIES 3
34 #define IEEE80211_MAX_PROBE_TRIES 5
35
36 /*
37  * beacon loss detection timeout
38  * XXX: should depend on beacon interval
39  */
40 #define IEEE80211_BEACON_LOSS_TIME      (2 * HZ)
41 /*
42  * Time the connection can be idle before we probe
43  * it to see if we can still talk to the AP.
44  */
45 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
46 /*
47  * Time we wait for a probe response after sending
48  * a probe request because of beacon loss or for
49  * checking the connection still works.
50  */
51 #define IEEE80211_PROBE_WAIT            (HZ / 2)
52
53 #define TMR_RUNNING_TIMER       0
54 #define TMR_RUNNING_CHANSW      1
55
56 /*
57  * All cfg80211 functions have to be called outside a locked
58  * section so that they can acquire a lock themselves... This
59  * is much simpler than queuing up things in cfg80211, but we
60  * do need some indirection for that here.
61  */
62 enum rx_mgmt_action {
63         /* no action required */
64         RX_MGMT_NONE,
65
66         /* caller must call cfg80211_send_rx_auth() */
67         RX_MGMT_CFG80211_AUTH,
68
69         /* caller must call cfg80211_send_rx_assoc() */
70         RX_MGMT_CFG80211_ASSOC,
71
72         /* caller must call cfg80211_send_deauth() */
73         RX_MGMT_CFG80211_DEAUTH,
74
75         /* caller must call cfg80211_send_disassoc() */
76         RX_MGMT_CFG80211_DISASSOC,
77
78         /* caller must tell cfg80211 about internal error */
79         RX_MGMT_CFG80211_ASSOC_ERROR,
80 };
81
82 /* utils */
83 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
84 {
85         WARN_ON(!mutex_is_locked(&ifmgd->mtx));
86 }
87
88 /*
89  * We can have multiple work items (and connection probing)
90  * scheduling this timer, but we need to take care to only
91  * reschedule it when it should fire _earlier_ than it was
92  * asked for before, or if it's not pending right now. This
93  * function ensures that. Note that it then is required to
94  * run this function for all timeouts after the first one
95  * has happened -- the work that runs from this timer will
96  * do that.
97  */
98 static void run_again(struct ieee80211_if_managed *ifmgd,
99                              unsigned long timeout)
100 {
101         ASSERT_MGD_MTX(ifmgd);
102
103         if (!timer_pending(&ifmgd->timer) ||
104             time_before(timeout, ifmgd->timer.expires))
105                 mod_timer(&ifmgd->timer, timeout);
106 }
107
108 static void mod_beacon_timer(struct ieee80211_sub_if_data *sdata)
109 {
110         if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
111                 return;
112
113         mod_timer(&sdata->u.mgd.bcn_mon_timer,
114                   round_jiffies_up(jiffies + IEEE80211_BEACON_LOSS_TIME));
115 }
116
117 static int ecw2cw(int ecw)
118 {
119         return (1 << ecw) - 1;
120 }
121
122 /*
123  * ieee80211_enable_ht should be called only after the operating band
124  * has been determined as ht configuration depends on the hw's
125  * HT abilities for a specific band.
126  */
127 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
128                                struct ieee80211_ht_info *hti,
129                                const u8 *bssid, u16 ap_ht_cap_flags)
130 {
131         struct ieee80211_local *local = sdata->local;
132         struct ieee80211_supported_band *sband;
133         struct sta_info *sta;
134         u32 changed = 0;
135         u16 ht_opmode;
136         bool enable_ht = true, ht_changed;
137         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
138
139         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
140
141         /* HT is not supported */
142         if (!sband->ht_cap.ht_supported)
143                 enable_ht = false;
144
145         /* check that channel matches the right operating channel */
146         if (local->hw.conf.channel->center_freq !=
147             ieee80211_channel_to_frequency(hti->control_chan))
148                 enable_ht = false;
149
150         if (enable_ht) {
151                 channel_type = NL80211_CHAN_HT20;
152
153                 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
154                     (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
155                     (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
156                         switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
157                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
158                                 if (!(local->hw.conf.channel->flags &
159                                     IEEE80211_CHAN_NO_HT40PLUS))
160                                         channel_type = NL80211_CHAN_HT40PLUS;
161                                 break;
162                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
163                                 if (!(local->hw.conf.channel->flags &
164                                     IEEE80211_CHAN_NO_HT40MINUS))
165                                         channel_type = NL80211_CHAN_HT40MINUS;
166                                 break;
167                         }
168                 }
169         }
170
171         ht_changed = conf_is_ht(&local->hw.conf) != enable_ht ||
172                      channel_type != local->hw.conf.channel_type;
173
174         local->oper_channel_type = channel_type;
175
176         if (ht_changed) {
177                 /* channel_type change automatically detected */
178                 ieee80211_hw_config(local, 0);
179
180                 rcu_read_lock();
181                 sta = sta_info_get(sdata, bssid);
182                 if (sta)
183                         rate_control_rate_update(local, sband, sta,
184                                                  IEEE80211_RC_HT_CHANGED);
185                 rcu_read_unlock();
186         }
187
188         /* disable HT */
189         if (!enable_ht)
190                 return 0;
191
192         ht_opmode = le16_to_cpu(hti->operation_mode);
193
194         /* if bss configuration changed store the new one */
195         if (!sdata->ht_opmode_valid ||
196             sdata->vif.bss_conf.ht_operation_mode != ht_opmode) {
197                 changed |= BSS_CHANGED_HT;
198                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
199                 sdata->ht_opmode_valid = true;
200         }
201
202         return changed;
203 }
204
205 /* frame sending functions */
206
207 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
208                                            const u8 *bssid, u16 stype, u16 reason,
209                                            void *cookie)
210 {
211         struct ieee80211_local *local = sdata->local;
212         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
213         struct sk_buff *skb;
214         struct ieee80211_mgmt *mgmt;
215
216         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
217         if (!skb) {
218                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
219                        "deauth/disassoc frame\n", sdata->name);
220                 return;
221         }
222         skb_reserve(skb, local->hw.extra_tx_headroom);
223
224         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
225         memset(mgmt, 0, 24);
226         memcpy(mgmt->da, bssid, ETH_ALEN);
227         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
228         memcpy(mgmt->bssid, bssid, ETH_ALEN);
229         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
230         skb_put(skb, 2);
231         /* u.deauth.reason_code == u.disassoc.reason_code */
232         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
233
234         if (stype == IEEE80211_STYPE_DEAUTH)
235                 if (cookie)
236                         __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
237                 else
238                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
239         else
240                 if (cookie)
241                         __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
242                 else
243                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
244         if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
245                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
246         ieee80211_tx_skb(sdata, skb);
247 }
248
249 void ieee80211_send_pspoll(struct ieee80211_local *local,
250                            struct ieee80211_sub_if_data *sdata)
251 {
252         struct ieee80211_pspoll *pspoll;
253         struct sk_buff *skb;
254
255         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
256         if (!skb)
257                 return;
258
259         pspoll = (struct ieee80211_pspoll *) skb->data;
260         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
261
262         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
263         ieee80211_tx_skb(sdata, skb);
264 }
265
266 void ieee80211_send_nullfunc(struct ieee80211_local *local,
267                              struct ieee80211_sub_if_data *sdata,
268                              int powersave)
269 {
270         struct sk_buff *skb;
271         struct ieee80211_hdr_3addr *nullfunc;
272
273         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
274         if (!skb)
275                 return;
276
277         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
278         if (powersave)
279                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
280
281         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
282         ieee80211_tx_skb(sdata, skb);
283 }
284
285 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
286                                           struct ieee80211_sub_if_data *sdata)
287 {
288         struct sk_buff *skb;
289         struct ieee80211_hdr *nullfunc;
290         __le16 fc;
291
292         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
293                 return;
294
295         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
296         if (!skb) {
297                 printk(KERN_DEBUG "%s: failed to allocate buffer for 4addr "
298                        "nullfunc frame\n", sdata->name);
299                 return;
300         }
301         skb_reserve(skb, local->hw.extra_tx_headroom);
302
303         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
304         memset(nullfunc, 0, 30);
305         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
306                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
307         nullfunc->frame_control = fc;
308         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
309         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
310         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
311         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
312
313         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
314         ieee80211_tx_skb(sdata, skb);
315 }
316
317 /* spectrum management related things */
318 static void ieee80211_chswitch_work(struct work_struct *work)
319 {
320         struct ieee80211_sub_if_data *sdata =
321                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
322         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
323
324         if (!ieee80211_sdata_running(sdata))
325                 return;
326
327         mutex_lock(&ifmgd->mtx);
328         if (!ifmgd->associated)
329                 goto out;
330
331         sdata->local->oper_channel = sdata->local->csa_channel;
332         ieee80211_hw_config(sdata->local, IEEE80211_CONF_CHANGE_CHANNEL);
333
334         /* XXX: shouldn't really modify cfg80211-owned data! */
335         ifmgd->associated->channel = sdata->local->oper_channel;
336
337         ieee80211_wake_queues_by_reason(&sdata->local->hw,
338                                         IEEE80211_QUEUE_STOP_REASON_CSA);
339  out:
340         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
341         mutex_unlock(&ifmgd->mtx);
342 }
343
344 static void ieee80211_chswitch_timer(unsigned long data)
345 {
346         struct ieee80211_sub_if_data *sdata =
347                 (struct ieee80211_sub_if_data *) data;
348         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
349
350         if (sdata->local->quiescing) {
351                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
352                 return;
353         }
354
355         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
356 }
357
358 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
359                                       struct ieee80211_channel_sw_ie *sw_elem,
360                                       struct ieee80211_bss *bss)
361 {
362         struct cfg80211_bss *cbss =
363                 container_of((void *)bss, struct cfg80211_bss, priv);
364         struct ieee80211_channel *new_ch;
365         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
366         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
367
368         ASSERT_MGD_MTX(ifmgd);
369
370         if (!ifmgd->associated)
371                 return;
372
373         if (sdata->local->scanning)
374                 return;
375
376         /* Disregard subsequent beacons if we are already running a timer
377            processing a CSA */
378
379         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
380                 return;
381
382         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
383         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
384                 return;
385
386         sdata->local->csa_channel = new_ch;
387
388         if (sw_elem->count <= 1) {
389                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
390         } else {
391                 ieee80211_stop_queues_by_reason(&sdata->local->hw,
392                                         IEEE80211_QUEUE_STOP_REASON_CSA);
393                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
394                 mod_timer(&ifmgd->chswitch_timer,
395                           jiffies +
396                           msecs_to_jiffies(sw_elem->count *
397                                            cbss->beacon_interval));
398         }
399 }
400
401 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
402                                         u16 capab_info, u8 *pwr_constr_elem,
403                                         u8 pwr_constr_elem_len)
404 {
405         struct ieee80211_conf *conf = &sdata->local->hw.conf;
406
407         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
408                 return;
409
410         /* Power constraint IE length should be 1 octet */
411         if (pwr_constr_elem_len != 1)
412                 return;
413
414         if ((*pwr_constr_elem <= conf->channel->max_power) &&
415             (*pwr_constr_elem != sdata->local->power_constr_level)) {
416                 sdata->local->power_constr_level = *pwr_constr_elem;
417                 ieee80211_hw_config(sdata->local, 0);
418         }
419 }
420
421 /* powersave */
422 static void ieee80211_enable_ps(struct ieee80211_local *local,
423                                 struct ieee80211_sub_if_data *sdata)
424 {
425         struct ieee80211_conf *conf = &local->hw.conf;
426
427         /*
428          * If we are scanning right now then the parameters will
429          * take effect when scan finishes.
430          */
431         if (local->scanning)
432                 return;
433
434         if (conf->dynamic_ps_timeout > 0 &&
435             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
436                 mod_timer(&local->dynamic_ps_timer, jiffies +
437                           msecs_to_jiffies(conf->dynamic_ps_timeout));
438         } else {
439                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
440                         ieee80211_send_nullfunc(local, sdata, 1);
441                 conf->flags |= IEEE80211_CONF_PS;
442                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
443         }
444 }
445
446 static void ieee80211_change_ps(struct ieee80211_local *local)
447 {
448         struct ieee80211_conf *conf = &local->hw.conf;
449
450         if (local->ps_sdata) {
451                 ieee80211_enable_ps(local, local->ps_sdata);
452         } else if (conf->flags & IEEE80211_CONF_PS) {
453                 conf->flags &= ~IEEE80211_CONF_PS;
454                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
455                 del_timer_sync(&local->dynamic_ps_timer);
456                 cancel_work_sync(&local->dynamic_ps_enable_work);
457         }
458 }
459
460 /* need to hold RTNL or interface lock */
461 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
462 {
463         struct ieee80211_sub_if_data *sdata, *found = NULL;
464         int count = 0;
465
466         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
467                 local->ps_sdata = NULL;
468                 return;
469         }
470
471         if (!list_empty(&local->work_list)) {
472                 local->ps_sdata = NULL;
473                 goto change;
474         }
475
476         list_for_each_entry(sdata, &local->interfaces, list) {
477                 if (!ieee80211_sdata_running(sdata))
478                         continue;
479                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
480                         continue;
481                 found = sdata;
482                 count++;
483         }
484
485         if (count == 1 && found->u.mgd.powersave &&
486             found->u.mgd.associated &&
487             found->u.mgd.associated->beacon_ies &&
488             !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
489                                     IEEE80211_STA_CONNECTION_POLL))) {
490                 s32 beaconint_us;
491
492                 if (latency < 0)
493                         latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY);
494
495                 beaconint_us = ieee80211_tu_to_usec(
496                                         found->vif.bss_conf.beacon_int);
497
498                 if (beaconint_us > latency) {
499                         local->ps_sdata = NULL;
500                 } else {
501                         struct ieee80211_bss *bss;
502                         int maxslp = 1;
503                         u8 dtimper;
504
505                         bss = (void *)found->u.mgd.associated->priv;
506                         dtimper = bss->dtim_period;
507
508                         /* If the TIM IE is invalid, pretend the value is 1 */
509                         if (!dtimper)
510                                 dtimper = 1;
511                         else if (dtimper > 1)
512                                 maxslp = min_t(int, dtimper,
513                                                     latency / beaconint_us);
514
515                         local->hw.conf.max_sleep_period = maxslp;
516                         local->hw.conf.ps_dtim_period = dtimper;
517                         local->ps_sdata = found;
518                 }
519         } else {
520                 local->ps_sdata = NULL;
521         }
522
523  change:
524         ieee80211_change_ps(local);
525 }
526
527 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
528 {
529         struct ieee80211_local *local =
530                 container_of(work, struct ieee80211_local,
531                              dynamic_ps_disable_work);
532
533         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
534                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
535                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
536         }
537
538         ieee80211_wake_queues_by_reason(&local->hw,
539                                         IEEE80211_QUEUE_STOP_REASON_PS);
540 }
541
542 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
543 {
544         struct ieee80211_local *local =
545                 container_of(work, struct ieee80211_local,
546                              dynamic_ps_enable_work);
547         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
548
549         /* can only happen when PS was just disabled anyway */
550         if (!sdata)
551                 return;
552
553         if (local->hw.conf.flags & IEEE80211_CONF_PS)
554                 return;
555
556         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
557                 ieee80211_send_nullfunc(local, sdata, 1);
558
559         local->hw.conf.flags |= IEEE80211_CONF_PS;
560         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
561 }
562
563 void ieee80211_dynamic_ps_timer(unsigned long data)
564 {
565         struct ieee80211_local *local = (void *) data;
566
567         if (local->quiescing || local->suspended)
568                 return;
569
570         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
571 }
572
573 /* MLME */
574 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
575                                      struct ieee80211_if_managed *ifmgd,
576                                      u8 *wmm_param, size_t wmm_param_len)
577 {
578         struct ieee80211_tx_queue_params params;
579         size_t left;
580         int count;
581         u8 *pos, uapsd_queues = 0;
582
583         if (local->hw.queues < 4)
584                 return;
585
586         if (!wmm_param)
587                 return;
588
589         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
590                 return;
591
592         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
593                 uapsd_queues = local->uapsd_queues;
594
595         count = wmm_param[6] & 0x0f;
596         if (count == ifmgd->wmm_last_param_set)
597                 return;
598         ifmgd->wmm_last_param_set = count;
599
600         pos = wmm_param + 8;
601         left = wmm_param_len - 8;
602
603         memset(&params, 0, sizeof(params));
604
605         local->wmm_acm = 0;
606         for (; left >= 4; left -= 4, pos += 4) {
607                 int aci = (pos[0] >> 5) & 0x03;
608                 int acm = (pos[0] >> 4) & 0x01;
609                 bool uapsd = false;
610                 int queue;
611
612                 switch (aci) {
613                 case 1: /* AC_BK */
614                         queue = 3;
615                         if (acm)
616                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
617                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
618                                 uapsd = true;
619                         break;
620                 case 2: /* AC_VI */
621                         queue = 1;
622                         if (acm)
623                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
624                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
625                                 uapsd = true;
626                         break;
627                 case 3: /* AC_VO */
628                         queue = 0;
629                         if (acm)
630                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
631                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
632                                 uapsd = true;
633                         break;
634                 case 0: /* AC_BE */
635                 default:
636                         queue = 2;
637                         if (acm)
638                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
639                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
640                                 uapsd = true;
641                         break;
642                 }
643
644                 params.aifs = pos[0] & 0x0f;
645                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
646                 params.cw_min = ecw2cw(pos[1] & 0x0f);
647                 params.txop = get_unaligned_le16(pos + 2);
648                 params.uapsd = uapsd;
649
650 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
651                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
652                        "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
653                        wiphy_name(local->hw.wiphy), queue, aci, acm,
654                        params.aifs, params.cw_min, params.cw_max, params.txop,
655                        params.uapsd);
656 #endif
657                 if (drv_conf_tx(local, queue, &params) && local->ops->conf_tx)
658                         printk(KERN_DEBUG "%s: failed to set TX queue "
659                                "parameters for queue %d\n",
660                                wiphy_name(local->hw.wiphy), queue);
661         }
662 }
663
664 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
665                                            u16 capab, bool erp_valid, u8 erp)
666 {
667         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
668         u32 changed = 0;
669         bool use_protection;
670         bool use_short_preamble;
671         bool use_short_slot;
672
673         if (erp_valid) {
674                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
675                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
676         } else {
677                 use_protection = false;
678                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
679         }
680
681         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
682         if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
683                 use_short_slot = true;
684
685         if (use_protection != bss_conf->use_cts_prot) {
686                 bss_conf->use_cts_prot = use_protection;
687                 changed |= BSS_CHANGED_ERP_CTS_PROT;
688         }
689
690         if (use_short_preamble != bss_conf->use_short_preamble) {
691                 bss_conf->use_short_preamble = use_short_preamble;
692                 changed |= BSS_CHANGED_ERP_PREAMBLE;
693         }
694
695         if (use_short_slot != bss_conf->use_short_slot) {
696                 bss_conf->use_short_slot = use_short_slot;
697                 changed |= BSS_CHANGED_ERP_SLOT;
698         }
699
700         return changed;
701 }
702
703 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
704                                      struct cfg80211_bss *cbss,
705                                      u32 bss_info_changed)
706 {
707         struct ieee80211_bss *bss = (void *)cbss->priv;
708         struct ieee80211_local *local = sdata->local;
709
710         bss_info_changed |= BSS_CHANGED_ASSOC;
711         /* set timing information */
712         sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
713         sdata->vif.bss_conf.timestamp = cbss->tsf;
714
715         bss_info_changed |= BSS_CHANGED_BEACON_INT;
716         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
717                 cbss->capability, bss->has_erp_value, bss->erp_value);
718
719         sdata->u.mgd.associated = cbss;
720         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
721
722         /* just to be sure */
723         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
724                                 IEEE80211_STA_BEACON_POLL);
725
726         /*
727          * Always handle WMM once after association regardless
728          * of the first value the AP uses. Setting -1 here has
729          * that effect because the AP values is an unsigned
730          * 4-bit value.
731          */
732         sdata->u.mgd.wmm_last_param_set = -1;
733
734         ieee80211_led_assoc(local, 1);
735
736         sdata->vif.bss_conf.assoc = 1;
737         /*
738          * For now just always ask the driver to update the basic rateset
739          * when we have associated, we aren't checking whether it actually
740          * changed or not.
741          */
742         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
743
744         /* And the BSSID changed - we're associated now */
745         bss_info_changed |= BSS_CHANGED_BSSID;
746
747         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
748
749         mutex_lock(&local->iflist_mtx);
750         ieee80211_recalc_ps(local, -1);
751         ieee80211_recalc_smps(local, sdata);
752         mutex_unlock(&local->iflist_mtx);
753
754         netif_tx_start_all_queues(sdata->dev);
755         netif_carrier_on(sdata->dev);
756 }
757
758 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata)
759 {
760         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
761         struct ieee80211_local *local = sdata->local;
762         struct sta_info *sta;
763         u32 changed = 0, config_changed = 0;
764         u8 bssid[ETH_ALEN];
765
766         ASSERT_MGD_MTX(ifmgd);
767
768         if (WARN_ON(!ifmgd->associated))
769                 return;
770
771         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
772
773         ifmgd->associated = NULL;
774         memset(ifmgd->bssid, 0, ETH_ALEN);
775
776         /*
777          * we need to commit the associated = NULL change because the
778          * scan code uses that to determine whether this iface should
779          * go to/wake up from powersave or not -- and could otherwise
780          * wake the queues erroneously.
781          */
782         smp_mb();
783
784         /*
785          * Thus, we can only afterwards stop the queues -- to account
786          * for the case where another CPU is finishing a scan at this
787          * time -- we don't want the scan code to enable queues.
788          */
789
790         netif_tx_stop_all_queues(sdata->dev);
791         netif_carrier_off(sdata->dev);
792
793         rcu_read_lock();
794         sta = sta_info_get(sdata, bssid);
795         if (sta)
796                 ieee80211_sta_tear_down_BA_sessions(sta);
797         rcu_read_unlock();
798
799         changed |= ieee80211_reset_erp_info(sdata);
800
801         ieee80211_led_assoc(local, 0);
802         changed |= BSS_CHANGED_ASSOC;
803         sdata->vif.bss_conf.assoc = false;
804
805         ieee80211_set_wmm_default(sdata);
806
807         /* channel(_type) changes are handled by ieee80211_hw_config */
808         local->oper_channel_type = NL80211_CHAN_NO_HT;
809
810         /* on the next assoc, re-program HT parameters */
811         sdata->ht_opmode_valid = false;
812
813         local->power_constr_level = 0;
814
815         del_timer_sync(&local->dynamic_ps_timer);
816         cancel_work_sync(&local->dynamic_ps_enable_work);
817
818         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
819                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
820                 config_changed |= IEEE80211_CONF_CHANGE_PS;
821         }
822
823         ieee80211_hw_config(local, config_changed);
824
825         /* And the BSSID changed -- not very interesting here */
826         changed |= BSS_CHANGED_BSSID;
827         ieee80211_bss_info_change_notify(sdata, changed);
828
829         rcu_read_lock();
830
831         sta = sta_info_get(sdata, bssid);
832         if (!sta) {
833                 rcu_read_unlock();
834                 return;
835         }
836
837         sta_info_unlink(&sta);
838
839         rcu_read_unlock();
840
841         sta_info_destroy(sta);
842 }
843
844 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
845                              struct ieee80211_hdr *hdr)
846 {
847         /*
848          * We can postpone the mgd.timer whenever receiving unicast frames
849          * from AP because we know that the connection is working both ways
850          * at that time. But multicast frames (and hence also beacons) must
851          * be ignored here, because we need to trigger the timer during
852          * data idle periods for sending the periodic probe request to the
853          * AP we're connected to.
854          */
855         if (is_multicast_ether_addr(hdr->addr1))
856                 return;
857
858         mod_timer(&sdata->u.mgd.conn_mon_timer,
859                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
860 }
861
862 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
863 {
864         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
865         const u8 *ssid;
866
867         ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
868         ieee80211_send_probe_req(sdata, ifmgd->associated->bssid,
869                                  ssid + 2, ssid[1], NULL, 0);
870
871         ifmgd->probe_send_count++;
872         ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
873         run_again(ifmgd, ifmgd->probe_timeout);
874 }
875
876 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
877                                    bool beacon)
878 {
879         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
880         bool already = false;
881
882         if (!ieee80211_sdata_running(sdata))
883                 return;
884
885         if (sdata->local->scanning)
886                 return;
887
888         if (sdata->local->tmp_channel)
889                 return;
890
891         mutex_lock(&ifmgd->mtx);
892
893         if (!ifmgd->associated)
894                 goto out;
895
896 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
897         if (beacon && net_ratelimit())
898                 printk(KERN_DEBUG "%s: detected beacon loss from AP "
899                        "- sending probe request\n", sdata->name);
900 #endif
901
902         /*
903          * The driver/our work has already reported this event or the
904          * connection monitoring has kicked in and we have already sent
905          * a probe request. Or maybe the AP died and the driver keeps
906          * reporting until we disassociate...
907          *
908          * In either case we have to ignore the current call to this
909          * function (except for setting the correct probe reason bit)
910          * because otherwise we would reset the timer every time and
911          * never check whether we received a probe response!
912          */
913         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
914                             IEEE80211_STA_CONNECTION_POLL))
915                 already = true;
916
917         if (beacon)
918                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
919         else
920                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
921
922         if (already)
923                 goto out;
924
925         mutex_lock(&sdata->local->iflist_mtx);
926         ieee80211_recalc_ps(sdata->local, -1);
927         mutex_unlock(&sdata->local->iflist_mtx);
928
929         ifmgd->probe_send_count = 0;
930         ieee80211_mgd_probe_ap_send(sdata);
931  out:
932         mutex_unlock(&ifmgd->mtx);
933 }
934
935 void ieee80211_beacon_loss_work(struct work_struct *work)
936 {
937         struct ieee80211_sub_if_data *sdata =
938                 container_of(work, struct ieee80211_sub_if_data,
939                              u.mgd.beacon_loss_work);
940
941         ieee80211_mgd_probe_ap(sdata, true);
942 }
943
944 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
945 {
946         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
947
948         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work);
949 }
950 EXPORT_SYMBOL(ieee80211_beacon_loss);
951
952 static enum rx_mgmt_action __must_check
953 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
954                          struct ieee80211_mgmt *mgmt, size_t len)
955 {
956         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
957         const u8 *bssid = NULL;
958         u16 reason_code;
959
960         if (len < 24 + 2)
961                 return RX_MGMT_NONE;
962
963         ASSERT_MGD_MTX(ifmgd);
964
965         bssid = ifmgd->associated->bssid;
966
967         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
968
969         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
970                         sdata->name, bssid, reason_code);
971
972         ieee80211_set_disassoc(sdata);
973         ieee80211_recalc_idle(sdata->local);
974
975         return RX_MGMT_CFG80211_DEAUTH;
976 }
977
978
979 static enum rx_mgmt_action __must_check
980 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
981                            struct ieee80211_mgmt *mgmt, size_t len)
982 {
983         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
984         u16 reason_code;
985
986         if (len < 24 + 2)
987                 return RX_MGMT_NONE;
988
989         ASSERT_MGD_MTX(ifmgd);
990
991         if (WARN_ON(!ifmgd->associated))
992                 return RX_MGMT_NONE;
993
994         if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
995                 return RX_MGMT_NONE;
996
997         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
998
999         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1000                         sdata->name, mgmt->sa, reason_code);
1001
1002         ieee80211_set_disassoc(sdata);
1003         ieee80211_recalc_idle(sdata->local);
1004         return RX_MGMT_CFG80211_DISASSOC;
1005 }
1006
1007
1008 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1009                                     struct ieee80211_mgmt *mgmt, size_t len)
1010 {
1011         struct ieee80211_sub_if_data *sdata = wk->sdata;
1012         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1013         struct ieee80211_local *local = sdata->local;
1014         struct ieee80211_supported_band *sband;
1015         struct sta_info *sta;
1016         struct cfg80211_bss *cbss = wk->assoc.bss;
1017         u8 *pos;
1018         u32 rates, basic_rates;
1019         u16 capab_info, aid;
1020         struct ieee802_11_elems elems;
1021         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1022         u32 changed = 0;
1023         int i, j, err;
1024         bool have_higher_than_11mbit = false;
1025         u16 ap_ht_cap_flags;
1026
1027         /* AssocResp and ReassocResp have identical structure */
1028
1029         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1030         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1031
1032         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1033                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1034                        "set\n", sdata->name, aid);
1035         aid &= ~(BIT(15) | BIT(14));
1036
1037         pos = mgmt->u.assoc_resp.variable;
1038         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1039
1040         if (!elems.supp_rates) {
1041                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1042                        sdata->name);
1043                 return false;
1044         }
1045
1046         ifmgd->aid = aid;
1047
1048         sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1049         if (!sta) {
1050                 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1051                        " the AP\n", sdata->name);
1052                 return false;
1053         }
1054
1055         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1056                            WLAN_STA_ASSOC_AP);
1057         if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1058                 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1059
1060         rates = 0;
1061         basic_rates = 0;
1062         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1063
1064         for (i = 0; i < elems.supp_rates_len; i++) {
1065                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1066                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1067
1068                 if (rate > 110)
1069                         have_higher_than_11mbit = true;
1070
1071                 for (j = 0; j < sband->n_bitrates; j++) {
1072                         if (sband->bitrates[j].bitrate == rate) {
1073                                 rates |= BIT(j);
1074                                 if (is_basic)
1075                                         basic_rates |= BIT(j);
1076                                 break;
1077                         }
1078                 }
1079         }
1080
1081         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1082                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1083                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1084
1085                 if (rate > 110)
1086                         have_higher_than_11mbit = true;
1087
1088                 for (j = 0; j < sband->n_bitrates; j++) {
1089                         if (sband->bitrates[j].bitrate == rate) {
1090                                 rates |= BIT(j);
1091                                 if (is_basic)
1092                                         basic_rates |= BIT(j);
1093                                 break;
1094                         }
1095                 }
1096         }
1097
1098         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1099         sdata->vif.bss_conf.basic_rates = basic_rates;
1100
1101         /* cf. IEEE 802.11 9.2.12 */
1102         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1103             have_higher_than_11mbit)
1104                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1105         else
1106                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1107
1108         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1109                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1110                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1111
1112         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1113
1114         rate_control_rate_init(sta);
1115
1116         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1117                 set_sta_flags(sta, WLAN_STA_MFP);
1118
1119         if (elems.wmm_param)
1120                 set_sta_flags(sta, WLAN_STA_WME);
1121
1122         err = sta_info_insert(sta);
1123         sta = NULL;
1124         if (err) {
1125                 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1126                        " the AP (error %d)\n", sdata->name, err);
1127                 return false;
1128         }
1129
1130         if (elems.wmm_param)
1131                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1132                                          elems.wmm_param_len);
1133         else
1134                 ieee80211_set_wmm_default(sdata);
1135
1136         local->oper_channel = wk->chan;
1137
1138         if (elems.ht_info_elem && elems.wmm_param &&
1139             (sdata->local->hw.queues >= 4) &&
1140             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1141                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1142                                                cbss->bssid, ap_ht_cap_flags);
1143
1144         /* set AID and assoc capability,
1145          * ieee80211_set_associated() will tell the driver */
1146         bss_conf->aid = aid;
1147         bss_conf->assoc_capability = capab_info;
1148         ieee80211_set_associated(sdata, cbss, changed);
1149
1150         /*
1151          * If we're using 4-addr mode, let the AP know that we're
1152          * doing so, so that it can create the STA VLAN on its side
1153          */
1154         if (ifmgd->use_4addr)
1155                 ieee80211_send_4addr_nullfunc(local, sdata);
1156
1157         /*
1158          * Start timer to probe the connection to the AP now.
1159          * Also start the timer that will detect beacon loss.
1160          */
1161         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1162         mod_beacon_timer(sdata);
1163
1164         return true;
1165 }
1166
1167
1168 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1169                                   struct ieee80211_mgmt *mgmt,
1170                                   size_t len,
1171                                   struct ieee80211_rx_status *rx_status,
1172                                   struct ieee802_11_elems *elems,
1173                                   bool beacon)
1174 {
1175         struct ieee80211_local *local = sdata->local;
1176         int freq;
1177         struct ieee80211_bss *bss;
1178         struct ieee80211_channel *channel;
1179         bool need_ps = false;
1180
1181         if (sdata->u.mgd.associated) {
1182                 bss = (void *)sdata->u.mgd.associated->priv;
1183                 /* not previously set so we may need to recalc */
1184                 need_ps = !bss->dtim_period;
1185         }
1186
1187         if (elems->ds_params && elems->ds_params_len == 1)
1188                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1189         else
1190                 freq = rx_status->freq;
1191
1192         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1193
1194         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1195                 return;
1196
1197         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1198                                         channel, beacon);
1199         if (bss)
1200                 ieee80211_rx_bss_put(local, bss);
1201
1202         if (!sdata->u.mgd.associated)
1203                 return;
1204
1205         if (need_ps) {
1206                 mutex_lock(&local->iflist_mtx);
1207                 ieee80211_recalc_ps(local, -1);
1208                 mutex_unlock(&local->iflist_mtx);
1209         }
1210
1211         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1212             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1213                                                         ETH_ALEN) == 0)) {
1214                 struct ieee80211_channel_sw_ie *sw_elem =
1215                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1216                 ieee80211_sta_process_chanswitch(sdata, sw_elem, bss);
1217         }
1218 }
1219
1220
1221 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1222                                          struct sk_buff *skb)
1223 {
1224         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1225         struct ieee80211_if_managed *ifmgd;
1226         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1227         size_t baselen, len = skb->len;
1228         struct ieee802_11_elems elems;
1229
1230         ifmgd = &sdata->u.mgd;
1231
1232         ASSERT_MGD_MTX(ifmgd);
1233
1234         if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1235                 return; /* ignore ProbeResp to foreign address */
1236
1237         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1238         if (baselen > len)
1239                 return;
1240
1241         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1242                                 &elems);
1243
1244         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1245
1246         if (ifmgd->associated &&
1247             memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0 &&
1248             ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1249                             IEEE80211_STA_CONNECTION_POLL)) {
1250                 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1251                                   IEEE80211_STA_BEACON_POLL);
1252                 mutex_lock(&sdata->local->iflist_mtx);
1253                 ieee80211_recalc_ps(sdata->local, -1);
1254                 mutex_unlock(&sdata->local->iflist_mtx);
1255                 /*
1256                  * We've received a probe response, but are not sure whether
1257                  * we have or will be receiving any beacons or data, so let's
1258                  * schedule the timers again, just in case.
1259                  */
1260                 mod_beacon_timer(sdata);
1261                 mod_timer(&ifmgd->conn_mon_timer,
1262                           round_jiffies_up(jiffies +
1263                                            IEEE80211_CONNECTION_IDLE_TIME));
1264         }
1265 }
1266
1267 /*
1268  * This is the canonical list of information elements we care about,
1269  * the filter code also gives us all changes to the Microsoft OUI
1270  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1271  *
1272  * We implement beacon filtering in software since that means we can
1273  * avoid processing the frame here and in cfg80211, and userspace
1274  * will not be able to tell whether the hardware supports it or not.
1275  *
1276  * XXX: This list needs to be dynamic -- userspace needs to be able to
1277  *      add items it requires. It also needs to be able to tell us to
1278  *      look out for other vendor IEs.
1279  */
1280 static const u64 care_about_ies =
1281         (1ULL << WLAN_EID_COUNTRY) |
1282         (1ULL << WLAN_EID_ERP_INFO) |
1283         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1284         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1285         (1ULL << WLAN_EID_HT_CAPABILITY) |
1286         (1ULL << WLAN_EID_HT_INFORMATION);
1287
1288 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1289                                      struct ieee80211_mgmt *mgmt,
1290                                      size_t len,
1291                                      struct ieee80211_rx_status *rx_status)
1292 {
1293         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1294         size_t baselen;
1295         struct ieee802_11_elems elems;
1296         struct ieee80211_local *local = sdata->local;
1297         u32 changed = 0;
1298         bool erp_valid, directed_tim = false;
1299         u8 erp_value = 0;
1300         u32 ncrc;
1301         u8 *bssid;
1302
1303         ASSERT_MGD_MTX(ifmgd);
1304
1305         /* Process beacon from the current BSS */
1306         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1307         if (baselen > len)
1308                 return;
1309
1310         if (rx_status->freq != local->hw.conf.channel->center_freq)
1311                 return;
1312
1313         /*
1314          * We might have received a number of frames, among them a
1315          * disassoc frame and a beacon...
1316          */
1317         if (!ifmgd->associated)
1318                 return;
1319
1320         bssid = ifmgd->associated->bssid;
1321
1322         /*
1323          * And in theory even frames from a different AP we were just
1324          * associated to a split-second ago!
1325          */
1326         if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1327                 return;
1328
1329         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1330 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1331                 if (net_ratelimit()) {
1332                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1333                                "to a received beacon\n", sdata->name);
1334                 }
1335 #endif
1336                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1337                 mutex_lock(&local->iflist_mtx);
1338                 ieee80211_recalc_ps(local, -1);
1339                 mutex_unlock(&local->iflist_mtx);
1340         }
1341
1342         /*
1343          * Push the beacon loss detection into the future since
1344          * we are processing a beacon from the AP just now.
1345          */
1346         mod_beacon_timer(sdata);
1347
1348         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1349         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1350                                           len - baselen, &elems,
1351                                           care_about_ies, ncrc);
1352
1353         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1354                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1355                                                    ifmgd->aid);
1356
1357         if (ncrc != ifmgd->beacon_crc) {
1358                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1359                                       true);
1360
1361                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1362                                          elems.wmm_param_len);
1363         }
1364
1365         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1366                 if (directed_tim) {
1367                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1368                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1369                                 ieee80211_hw_config(local,
1370                                                     IEEE80211_CONF_CHANGE_PS);
1371                                 ieee80211_send_nullfunc(local, sdata, 0);
1372                         } else {
1373                                 local->pspolling = true;
1374
1375                                 /*
1376                                  * Here is assumed that the driver will be
1377                                  * able to send ps-poll frame and receive a
1378                                  * response even though power save mode is
1379                                  * enabled, but some drivers might require
1380                                  * to disable power save here. This needs
1381                                  * to be investigated.
1382                                  */
1383                                 ieee80211_send_pspoll(local, sdata);
1384                         }
1385                 }
1386         }
1387
1388         if (ncrc == ifmgd->beacon_crc)
1389                 return;
1390         ifmgd->beacon_crc = ncrc;
1391
1392         if (elems.erp_info && elems.erp_info_len >= 1) {
1393                 erp_valid = true;
1394                 erp_value = elems.erp_info[0];
1395         } else {
1396                 erp_valid = false;
1397         }
1398         changed |= ieee80211_handle_bss_capability(sdata,
1399                         le16_to_cpu(mgmt->u.beacon.capab_info),
1400                         erp_valid, erp_value);
1401
1402
1403         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1404             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1405                 struct sta_info *sta;
1406                 struct ieee80211_supported_band *sband;
1407                 u16 ap_ht_cap_flags;
1408
1409                 rcu_read_lock();
1410
1411                 sta = sta_info_get(sdata, bssid);
1412                 if (WARN_ON(!sta)) {
1413                         rcu_read_unlock();
1414                         return;
1415                 }
1416
1417                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1418
1419                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1420                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1421
1422                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1423
1424                 rcu_read_unlock();
1425
1426                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1427                                                bssid, ap_ht_cap_flags);
1428         }
1429
1430         /* Note: country IE parsing is done for us by cfg80211 */
1431         if (elems.country_elem) {
1432                 /* TODO: IBSS also needs this */
1433                 if (elems.pwr_constr_elem)
1434                         ieee80211_handle_pwr_constr(sdata,
1435                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1436                                 elems.pwr_constr_elem,
1437                                 elems.pwr_constr_elem_len);
1438         }
1439
1440         ieee80211_bss_info_change_notify(sdata, changed);
1441 }
1442
1443 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1444                                           struct sk_buff *skb)
1445 {
1446         struct ieee80211_local *local = sdata->local;
1447         struct ieee80211_mgmt *mgmt;
1448         u16 fc;
1449
1450         if (skb->len < 24)
1451                 return RX_DROP_MONITOR;
1452
1453         mgmt = (struct ieee80211_mgmt *) skb->data;
1454         fc = le16_to_cpu(mgmt->frame_control);
1455
1456         switch (fc & IEEE80211_FCTL_STYPE) {
1457         case IEEE80211_STYPE_PROBE_RESP:
1458         case IEEE80211_STYPE_BEACON:
1459         case IEEE80211_STYPE_DEAUTH:
1460         case IEEE80211_STYPE_DISASSOC:
1461         case IEEE80211_STYPE_ACTION:
1462                 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1463                 ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
1464                 return RX_QUEUED;
1465         }
1466
1467         return RX_DROP_MONITOR;
1468 }
1469
1470 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1471                                          struct sk_buff *skb)
1472 {
1473         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1474         struct ieee80211_rx_status *rx_status;
1475         struct ieee80211_mgmt *mgmt;
1476         enum rx_mgmt_action rma = RX_MGMT_NONE;
1477         u16 fc;
1478
1479         rx_status = (struct ieee80211_rx_status *) skb->cb;
1480         mgmt = (struct ieee80211_mgmt *) skb->data;
1481         fc = le16_to_cpu(mgmt->frame_control);
1482
1483         mutex_lock(&ifmgd->mtx);
1484
1485         if (ifmgd->associated &&
1486             memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1487                 switch (fc & IEEE80211_FCTL_STYPE) {
1488                 case IEEE80211_STYPE_BEACON:
1489                         ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1490                                                  rx_status);
1491                         break;
1492                 case IEEE80211_STYPE_PROBE_RESP:
1493                         ieee80211_rx_mgmt_probe_resp(sdata, skb);
1494                         break;
1495                 case IEEE80211_STYPE_DEAUTH:
1496                         rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1497                         break;
1498                 case IEEE80211_STYPE_DISASSOC:
1499                         rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1500                         break;
1501                 case IEEE80211_STYPE_ACTION:
1502                         if (mgmt->u.action.category != WLAN_CATEGORY_SPECTRUM_MGMT)
1503                                 break;
1504
1505                         ieee80211_sta_process_chanswitch(sdata,
1506                                         &mgmt->u.action.u.chan_switch.sw_elem,
1507                                         (void *)ifmgd->associated->priv);
1508                         break;
1509                 }
1510                 mutex_unlock(&ifmgd->mtx);
1511
1512                 switch (rma) {
1513                 case RX_MGMT_NONE:
1514                         /* no action */
1515                         break;
1516                 case RX_MGMT_CFG80211_DEAUTH:
1517                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1518                         break;
1519                 case RX_MGMT_CFG80211_DISASSOC:
1520                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1521                         break;
1522                 default:
1523                         WARN(1, "unexpected: %d", rma);
1524                 }
1525                 goto out;
1526         }
1527
1528         mutex_unlock(&ifmgd->mtx);
1529
1530         if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1531             (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH)
1532                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1533
1534  out:
1535         kfree_skb(skb);
1536 }
1537
1538 static void ieee80211_sta_timer(unsigned long data)
1539 {
1540         struct ieee80211_sub_if_data *sdata =
1541                 (struct ieee80211_sub_if_data *) data;
1542         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1543         struct ieee80211_local *local = sdata->local;
1544
1545         if (local->quiescing) {
1546                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1547                 return;
1548         }
1549
1550         ieee80211_queue_work(&local->hw, &ifmgd->work);
1551 }
1552
1553 static void ieee80211_sta_work(struct work_struct *work)
1554 {
1555         struct ieee80211_sub_if_data *sdata =
1556                 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
1557         struct ieee80211_local *local = sdata->local;
1558         struct ieee80211_if_managed *ifmgd;
1559         struct sk_buff *skb;
1560
1561         if (!ieee80211_sdata_running(sdata))
1562                 return;
1563
1564         if (local->scanning)
1565                 return;
1566
1567         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1568                 return;
1569
1570         /*
1571          * ieee80211_queue_work() should have picked up most cases,
1572          * here we'll pick the the rest.
1573          */
1574         if (WARN(local->suspended, "STA MLME work scheduled while "
1575                  "going to suspend\n"))
1576                 return;
1577
1578         ifmgd = &sdata->u.mgd;
1579
1580         /* first process frames to avoid timing out while a frame is pending */
1581         while ((skb = skb_dequeue(&ifmgd->skb_queue)))
1582                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1583
1584         /* then process the rest of the work */
1585         mutex_lock(&ifmgd->mtx);
1586
1587         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1588                             IEEE80211_STA_CONNECTION_POLL) &&
1589             ifmgd->associated) {
1590                 u8 bssid[ETH_ALEN];
1591
1592                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1593                 if (time_is_after_jiffies(ifmgd->probe_timeout))
1594                         run_again(ifmgd, ifmgd->probe_timeout);
1595
1596                 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
1597 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1598                         printk(KERN_DEBUG "No probe response from AP %pM"
1599                                 " after %dms, try %d\n", bssid,
1600                                 (1000 * IEEE80211_PROBE_WAIT)/HZ,
1601                                 ifmgd->probe_send_count);
1602 #endif
1603                         ieee80211_mgd_probe_ap_send(sdata);
1604                 } else {
1605                         /*
1606                          * We actually lost the connection ... or did we?
1607                          * Let's make sure!
1608                          */
1609                         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1610                                           IEEE80211_STA_BEACON_POLL);
1611                         printk(KERN_DEBUG "No probe response from AP %pM"
1612                                 " after %dms, disconnecting.\n",
1613                                 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
1614                         ieee80211_set_disassoc(sdata);
1615                         ieee80211_recalc_idle(local);
1616                         mutex_unlock(&ifmgd->mtx);
1617                         /*
1618                          * must be outside lock due to cfg80211,
1619                          * but that's not a problem.
1620                          */
1621                         ieee80211_send_deauth_disassoc(sdata, bssid,
1622                                         IEEE80211_STYPE_DEAUTH,
1623                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1624                                         NULL);
1625                         mutex_lock(&ifmgd->mtx);
1626                 }
1627         }
1628
1629         mutex_unlock(&ifmgd->mtx);
1630 }
1631
1632 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
1633 {
1634         struct ieee80211_sub_if_data *sdata =
1635                 (struct ieee80211_sub_if_data *) data;
1636         struct ieee80211_local *local = sdata->local;
1637
1638         if (local->quiescing)
1639                 return;
1640
1641         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work);
1642 }
1643
1644 static void ieee80211_sta_conn_mon_timer(unsigned long data)
1645 {
1646         struct ieee80211_sub_if_data *sdata =
1647                 (struct ieee80211_sub_if_data *) data;
1648         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1649         struct ieee80211_local *local = sdata->local;
1650
1651         if (local->quiescing)
1652                 return;
1653
1654         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
1655 }
1656
1657 static void ieee80211_sta_monitor_work(struct work_struct *work)
1658 {
1659         struct ieee80211_sub_if_data *sdata =
1660                 container_of(work, struct ieee80211_sub_if_data,
1661                              u.mgd.monitor_work);
1662
1663         ieee80211_mgd_probe_ap(sdata, false);
1664 }
1665
1666 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
1667 {
1668         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1669                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
1670                                         IEEE80211_STA_CONNECTION_POLL);
1671
1672                 /* let's probe the connection once */
1673                 ieee80211_queue_work(&sdata->local->hw,
1674                            &sdata->u.mgd.monitor_work);
1675                 /* and do all the other regular work too */
1676                 ieee80211_queue_work(&sdata->local->hw,
1677                            &sdata->u.mgd.work);
1678         }
1679 }
1680
1681 #ifdef CONFIG_PM
1682 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
1683 {
1684         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1685
1686         /*
1687          * we need to use atomic bitops for the running bits
1688          * only because both timers might fire at the same
1689          * time -- the code here is properly synchronised.
1690          */
1691
1692         cancel_work_sync(&ifmgd->work);
1693         cancel_work_sync(&ifmgd->beacon_loss_work);
1694         if (del_timer_sync(&ifmgd->timer))
1695                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1696
1697         cancel_work_sync(&ifmgd->chswitch_work);
1698         if (del_timer_sync(&ifmgd->chswitch_timer))
1699                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
1700
1701         cancel_work_sync(&ifmgd->monitor_work);
1702         /* these will just be re-established on connection */
1703         del_timer_sync(&ifmgd->conn_mon_timer);
1704         del_timer_sync(&ifmgd->bcn_mon_timer);
1705 }
1706
1707 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
1708 {
1709         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1710
1711         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
1712                 add_timer(&ifmgd->timer);
1713         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
1714                 add_timer(&ifmgd->chswitch_timer);
1715 }
1716 #endif
1717
1718 /* interface setup */
1719 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
1720 {
1721         struct ieee80211_if_managed *ifmgd;
1722
1723         ifmgd = &sdata->u.mgd;
1724         INIT_WORK(&ifmgd->work, ieee80211_sta_work);
1725         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
1726         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
1727         INIT_WORK(&ifmgd->beacon_loss_work, ieee80211_beacon_loss_work);
1728         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
1729                     (unsigned long) sdata);
1730         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
1731                     (unsigned long) sdata);
1732         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
1733                     (unsigned long) sdata);
1734         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
1735                     (unsigned long) sdata);
1736         skb_queue_head_init(&ifmgd->skb_queue);
1737
1738         ifmgd->flags = 0;
1739
1740         mutex_init(&ifmgd->mtx);
1741
1742         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
1743                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
1744         else
1745                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
1746 }
1747
1748 /* scan finished notification */
1749 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
1750 {
1751         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
1752
1753         /* Restart STA timers */
1754         rcu_read_lock();
1755         list_for_each_entry_rcu(sdata, &local->interfaces, list)
1756                 ieee80211_restart_sta_timer(sdata);
1757         rcu_read_unlock();
1758 }
1759
1760 int ieee80211_max_network_latency(struct notifier_block *nb,
1761                                   unsigned long data, void *dummy)
1762 {
1763         s32 latency_usec = (s32) data;
1764         struct ieee80211_local *local =
1765                 container_of(nb, struct ieee80211_local,
1766                              network_latency_notifier);
1767
1768         mutex_lock(&local->iflist_mtx);
1769         ieee80211_recalc_ps(local, latency_usec);
1770         mutex_unlock(&local->iflist_mtx);
1771
1772         return 0;
1773 }
1774
1775 /* config hooks */
1776 static enum work_done_result
1777 ieee80211_probe_auth_done(struct ieee80211_work *wk,
1778                           struct sk_buff *skb)
1779 {
1780         if (!skb) {
1781                 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
1782                 return WORK_DONE_DESTROY;
1783         }
1784
1785         if (wk->type == IEEE80211_WORK_AUTH) {
1786                 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
1787                 return WORK_DONE_DESTROY;
1788         }
1789
1790         mutex_lock(&wk->sdata->u.mgd.mtx);
1791         ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
1792         mutex_unlock(&wk->sdata->u.mgd.mtx);
1793
1794         wk->type = IEEE80211_WORK_AUTH;
1795         wk->probe_auth.tries = 0;
1796         return WORK_DONE_REQUEUE;
1797 }
1798
1799 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
1800                        struct cfg80211_auth_request *req)
1801 {
1802         const u8 *ssid;
1803         struct ieee80211_work *wk;
1804         u16 auth_alg;
1805
1806         switch (req->auth_type) {
1807         case NL80211_AUTHTYPE_OPEN_SYSTEM:
1808                 auth_alg = WLAN_AUTH_OPEN;
1809                 break;
1810         case NL80211_AUTHTYPE_SHARED_KEY:
1811                 auth_alg = WLAN_AUTH_SHARED_KEY;
1812                 break;
1813         case NL80211_AUTHTYPE_FT:
1814                 auth_alg = WLAN_AUTH_FT;
1815                 break;
1816         case NL80211_AUTHTYPE_NETWORK_EAP:
1817                 auth_alg = WLAN_AUTH_LEAP;
1818                 break;
1819         default:
1820                 return -EOPNOTSUPP;
1821         }
1822
1823         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
1824         if (!wk)
1825                 return -ENOMEM;
1826
1827         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
1828
1829         if (req->ie && req->ie_len) {
1830                 memcpy(wk->ie, req->ie, req->ie_len);
1831                 wk->ie_len = req->ie_len;
1832         }
1833
1834         if (req->key && req->key_len) {
1835                 wk->probe_auth.key_len = req->key_len;
1836                 wk->probe_auth.key_idx = req->key_idx;
1837                 memcpy(wk->probe_auth.key, req->key, req->key_len);
1838         }
1839
1840         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
1841         memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
1842         wk->probe_auth.ssid_len = ssid[1];
1843
1844         wk->probe_auth.algorithm = auth_alg;
1845         wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
1846
1847         wk->type = IEEE80211_WORK_DIRECT_PROBE;
1848         wk->chan = req->bss->channel;
1849         wk->sdata = sdata;
1850         wk->done = ieee80211_probe_auth_done;
1851
1852         ieee80211_add_work(wk);
1853         return 0;
1854 }
1855
1856 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
1857                                                   struct sk_buff *skb)
1858 {
1859         struct ieee80211_mgmt *mgmt;
1860         u16 status;
1861
1862         if (!skb) {
1863                 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
1864                 return WORK_DONE_DESTROY;
1865         }
1866
1867         mgmt = (void *)skb->data;
1868         status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1869
1870         if (status == WLAN_STATUS_SUCCESS) {
1871                 mutex_lock(&wk->sdata->u.mgd.mtx);
1872                 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
1873                         mutex_unlock(&wk->sdata->u.mgd.mtx);
1874                         /* oops -- internal error -- send timeout for now */
1875                         cfg80211_send_assoc_timeout(wk->sdata->dev,
1876                                                     wk->filter_ta);
1877                         return WORK_DONE_DESTROY;
1878                 }
1879                 mutex_unlock(&wk->sdata->u.mgd.mtx);
1880         }
1881
1882         cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
1883         return WORK_DONE_DESTROY;
1884 }
1885
1886 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
1887                         struct cfg80211_assoc_request *req)
1888 {
1889         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1890         struct ieee80211_bss *bss = (void *)req->bss->priv;
1891         struct ieee80211_work *wk;
1892         const u8 *ssid;
1893         int i;
1894
1895         mutex_lock(&ifmgd->mtx);
1896         if (ifmgd->associated) {
1897                 mutex_unlock(&ifmgd->mtx);
1898                 return -EALREADY;
1899         }
1900         mutex_unlock(&ifmgd->mtx);
1901
1902         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
1903         if (!wk)
1904                 return -ENOMEM;
1905
1906         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
1907
1908         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
1909                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
1910                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
1911                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
1912                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
1913
1914
1915         if (req->ie && req->ie_len) {
1916                 memcpy(wk->ie, req->ie, req->ie_len);
1917                 wk->ie_len = req->ie_len;
1918         } else
1919                 wk->ie_len = 0;
1920
1921         wk->assoc.bss = req->bss;
1922
1923         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
1924
1925         /* new association always uses requested smps mode */
1926         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
1927                 if (ifmgd->powersave)
1928                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
1929                 else
1930                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
1931         } else
1932                 ifmgd->ap_smps = ifmgd->req_smps;
1933
1934         wk->assoc.smps = ifmgd->ap_smps;
1935         /*
1936          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
1937          * We still associate in non-HT mode (11a/b/g) if any one of these
1938          * ciphers is configured as pairwise.
1939          * We can set this to true for non-11n hardware, that'll be checked
1940          * separately along with the peer capabilities.
1941          */
1942         wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
1943         wk->assoc.capability = req->bss->capability;
1944         wk->assoc.wmm_used = bss->wmm_used;
1945         wk->assoc.supp_rates = bss->supp_rates;
1946         wk->assoc.supp_rates_len = bss->supp_rates_len;
1947         wk->assoc.ht_information_ie =
1948                 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
1949
1950         if (bss->wmm_used && bss->uapsd_supported &&
1951             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
1952                 wk->assoc.uapsd_used = true;
1953                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
1954         } else {
1955                 wk->assoc.uapsd_used = false;
1956                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
1957         }
1958
1959         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
1960         memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
1961         wk->assoc.ssid_len = ssid[1];
1962
1963         if (req->prev_bssid)
1964                 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
1965
1966         wk->type = IEEE80211_WORK_ASSOC;
1967         wk->chan = req->bss->channel;
1968         wk->sdata = sdata;
1969         wk->done = ieee80211_assoc_done;
1970
1971         if (req->use_mfp) {
1972                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
1973                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
1974         } else {
1975                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
1976                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
1977         }
1978
1979         if (req->crypto.control_port)
1980                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
1981         else
1982                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
1983
1984         ieee80211_add_work(wk);
1985         return 0;
1986 }
1987
1988 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
1989                          struct cfg80211_deauth_request *req,
1990                          void *cookie)
1991 {
1992         struct ieee80211_local *local = sdata->local;
1993         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1994         struct ieee80211_work *wk;
1995         const u8 *bssid = req->bss->bssid;
1996
1997         mutex_lock(&ifmgd->mtx);
1998
1999         if (ifmgd->associated == req->bss) {
2000                 bssid = req->bss->bssid;
2001                 ieee80211_set_disassoc(sdata);
2002                 mutex_unlock(&ifmgd->mtx);
2003         } else {
2004                 bool not_auth_yet = false;
2005
2006                 mutex_unlock(&ifmgd->mtx);
2007
2008                 mutex_lock(&local->work_mtx);
2009                 list_for_each_entry(wk, &local->work_list, list) {
2010                         if (wk->type != IEEE80211_WORK_DIRECT_PROBE)
2011                                 continue;
2012                         if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2013                                 continue;
2014                         not_auth_yet = true;
2015                         list_del(&wk->list);
2016                         free_work(wk);
2017                         break;
2018                 }
2019                 mutex_unlock(&local->work_mtx);
2020
2021                 /*
2022                  * If somebody requests authentication and we haven't
2023                  * sent out an auth frame yet there's no need to send
2024                  * out a deauth frame either. If the state was PROBE,
2025                  * then this is the case. If it's AUTH we have sent a
2026                  * frame, and if it's IDLE we have completed the auth
2027                  * process already.
2028                  */
2029                 if (not_auth_yet) {
2030                         __cfg80211_auth_canceled(sdata->dev, bssid);
2031                         return 0;
2032                 }
2033         }
2034
2035         printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2036                sdata->name, bssid, req->reason_code);
2037
2038         ieee80211_send_deauth_disassoc(sdata, bssid,
2039                         IEEE80211_STYPE_DEAUTH, req->reason_code,
2040                         cookie);
2041
2042         ieee80211_recalc_idle(sdata->local);
2043
2044         return 0;
2045 }
2046
2047 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2048                            struct cfg80211_disassoc_request *req,
2049                            void *cookie)
2050 {
2051         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2052
2053         mutex_lock(&ifmgd->mtx);
2054
2055         /*
2056          * cfg80211 should catch this ... but it's racy since
2057          * we can receive a disassoc frame, process it, hand it
2058          * to cfg80211 while that's in a locked section already
2059          * trying to tell us that the user wants to disconnect.
2060          */
2061         if (ifmgd->associated != req->bss) {
2062                 mutex_unlock(&ifmgd->mtx);
2063                 return -ENOLINK;
2064         }
2065
2066         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2067                sdata->name, req->bss->bssid, req->reason_code);
2068
2069         ieee80211_set_disassoc(sdata);
2070
2071         mutex_unlock(&ifmgd->mtx);
2072
2073         ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2074                         IEEE80211_STYPE_DISASSOC, req->reason_code,
2075                         cookie);
2076
2077         ieee80211_recalc_idle(sdata->local);
2078
2079         return 0;
2080 }