mac80211: proper bss private data handling
[pandora-kernel.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_if_managed *ifmgd = &sdata->u.mgd;
253         struct ieee80211_pspoll *pspoll;
254         struct sk_buff *skb;
255         u16 fc;
256
257         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
258         if (!skb) {
259                 printk(KERN_DEBUG "%s: failed to allocate buffer for "
260                        "pspoll frame\n", sdata->name);
261                 return;
262         }
263         skb_reserve(skb, local->hw.extra_tx_headroom);
264
265         pspoll = (struct ieee80211_pspoll *) skb_put(skb, sizeof(*pspoll));
266         memset(pspoll, 0, sizeof(*pspoll));
267         fc = IEEE80211_FTYPE_CTL | IEEE80211_STYPE_PSPOLL | IEEE80211_FCTL_PM;
268         pspoll->frame_control = cpu_to_le16(fc);
269         pspoll->aid = cpu_to_le16(ifmgd->aid);
270
271         /* aid in PS-Poll has its two MSBs each set to 1 */
272         pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
273
274         memcpy(pspoll->bssid, ifmgd->bssid, ETH_ALEN);
275         memcpy(pspoll->ta, sdata->vif.addr, ETH_ALEN);
276
277         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
278         ieee80211_tx_skb(sdata, skb);
279 }
280
281 void ieee80211_send_nullfunc(struct ieee80211_local *local,
282                              struct ieee80211_sub_if_data *sdata,
283                              int powersave)
284 {
285         struct sk_buff *skb;
286         struct ieee80211_hdr *nullfunc;
287         __le16 fc;
288
289         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
290                 return;
291
292         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 24);
293         if (!skb) {
294                 printk(KERN_DEBUG "%s: failed to allocate buffer for nullfunc "
295                        "frame\n", sdata->name);
296                 return;
297         }
298         skb_reserve(skb, local->hw.extra_tx_headroom);
299
300         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 24);
301         memset(nullfunc, 0, 24);
302         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
303                          IEEE80211_FCTL_TODS);
304         if (powersave)
305                 fc |= cpu_to_le16(IEEE80211_FCTL_PM);
306         nullfunc->frame_control = fc;
307         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
308         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
309         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
310
311         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
312         ieee80211_tx_skb(sdata, skb);
313 }
314
315 /* spectrum management related things */
316 static void ieee80211_chswitch_work(struct work_struct *work)
317 {
318         struct ieee80211_sub_if_data *sdata =
319                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
320         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
321
322         if (!ieee80211_sdata_running(sdata))
323                 return;
324
325         mutex_lock(&ifmgd->mtx);
326         if (!ifmgd->associated)
327                 goto out;
328
329         sdata->local->oper_channel = sdata->local->csa_channel;
330         ieee80211_hw_config(sdata->local, IEEE80211_CONF_CHANGE_CHANNEL);
331
332         /* XXX: shouldn't really modify cfg80211-owned data! */
333         ifmgd->associated->channel = sdata->local->oper_channel;
334
335         ieee80211_wake_queues_by_reason(&sdata->local->hw,
336                                         IEEE80211_QUEUE_STOP_REASON_CSA);
337  out:
338         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
339         mutex_unlock(&ifmgd->mtx);
340 }
341
342 static void ieee80211_chswitch_timer(unsigned long data)
343 {
344         struct ieee80211_sub_if_data *sdata =
345                 (struct ieee80211_sub_if_data *) data;
346         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
347
348         if (sdata->local->quiescing) {
349                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
350                 return;
351         }
352
353         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
354 }
355
356 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
357                                       struct ieee80211_channel_sw_ie *sw_elem,
358                                       struct ieee80211_bss *bss)
359 {
360         struct cfg80211_bss *cbss =
361                 container_of((void *)bss, struct cfg80211_bss, priv);
362         struct ieee80211_channel *new_ch;
363         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
364         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num);
365
366         ASSERT_MGD_MTX(ifmgd);
367
368         if (!ifmgd->associated)
369                 return;
370
371         if (sdata->local->scanning)
372                 return;
373
374         /* Disregard subsequent beacons if we are already running a timer
375            processing a CSA */
376
377         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
378                 return;
379
380         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
381         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
382                 return;
383
384         sdata->local->csa_channel = new_ch;
385
386         if (sw_elem->count <= 1) {
387                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
388         } else {
389                 ieee80211_stop_queues_by_reason(&sdata->local->hw,
390                                         IEEE80211_QUEUE_STOP_REASON_CSA);
391                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
392                 mod_timer(&ifmgd->chswitch_timer,
393                           jiffies +
394                           msecs_to_jiffies(sw_elem->count *
395                                            cbss->beacon_interval));
396         }
397 }
398
399 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
400                                         u16 capab_info, u8 *pwr_constr_elem,
401                                         u8 pwr_constr_elem_len)
402 {
403         struct ieee80211_conf *conf = &sdata->local->hw.conf;
404
405         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
406                 return;
407
408         /* Power constraint IE length should be 1 octet */
409         if (pwr_constr_elem_len != 1)
410                 return;
411
412         if ((*pwr_constr_elem <= conf->channel->max_power) &&
413             (*pwr_constr_elem != sdata->local->power_constr_level)) {
414                 sdata->local->power_constr_level = *pwr_constr_elem;
415                 ieee80211_hw_config(sdata->local, 0);
416         }
417 }
418
419 /* powersave */
420 static void ieee80211_enable_ps(struct ieee80211_local *local,
421                                 struct ieee80211_sub_if_data *sdata)
422 {
423         struct ieee80211_conf *conf = &local->hw.conf;
424
425         /*
426          * If we are scanning right now then the parameters will
427          * take effect when scan finishes.
428          */
429         if (local->scanning)
430                 return;
431
432         if (conf->dynamic_ps_timeout > 0 &&
433             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
434                 mod_timer(&local->dynamic_ps_timer, jiffies +
435                           msecs_to_jiffies(conf->dynamic_ps_timeout));
436         } else {
437                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
438                         ieee80211_send_nullfunc(local, sdata, 1);
439                 conf->flags |= IEEE80211_CONF_PS;
440                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
441         }
442 }
443
444 static void ieee80211_change_ps(struct ieee80211_local *local)
445 {
446         struct ieee80211_conf *conf = &local->hw.conf;
447
448         if (local->ps_sdata) {
449                 ieee80211_enable_ps(local, local->ps_sdata);
450         } else if (conf->flags & IEEE80211_CONF_PS) {
451                 conf->flags &= ~IEEE80211_CONF_PS;
452                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
453                 del_timer_sync(&local->dynamic_ps_timer);
454                 cancel_work_sync(&local->dynamic_ps_enable_work);
455         }
456 }
457
458 /* need to hold RTNL or interface lock */
459 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
460 {
461         struct ieee80211_sub_if_data *sdata, *found = NULL;
462         int count = 0;
463
464         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
465                 local->ps_sdata = NULL;
466                 return;
467         }
468
469         if (!list_empty(&local->work_list)) {
470                 local->ps_sdata = NULL;
471                 goto change;
472         }
473
474         list_for_each_entry(sdata, &local->interfaces, list) {
475                 if (!ieee80211_sdata_running(sdata))
476                         continue;
477                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
478                         continue;
479                 found = sdata;
480                 count++;
481         }
482
483         if (count == 1 && found->u.mgd.powersave &&
484             found->u.mgd.associated &&
485             !(found->u.mgd.flags & (IEEE80211_STA_BEACON_POLL |
486                                     IEEE80211_STA_CONNECTION_POLL))) {
487                 s32 beaconint_us;
488
489                 if (latency < 0)
490                         latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY);
491
492                 beaconint_us = ieee80211_tu_to_usec(
493                                         found->vif.bss_conf.beacon_int);
494
495                 if (beaconint_us > latency) {
496                         local->ps_sdata = NULL;
497                 } else {
498                         u8 dtimper = found->vif.bss_conf.dtim_period;
499                         int maxslp = 1;
500
501                         if (dtimper > 1)
502                                 maxslp = min_t(int, dtimper,
503                                                     latency / beaconint_us);
504
505                         local->hw.conf.max_sleep_period = maxslp;
506                         local->ps_sdata = found;
507                 }
508         } else {
509                 local->ps_sdata = NULL;
510         }
511
512  change:
513         ieee80211_change_ps(local);
514 }
515
516 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
517 {
518         struct ieee80211_local *local =
519                 container_of(work, struct ieee80211_local,
520                              dynamic_ps_disable_work);
521
522         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
523                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
524                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
525         }
526
527         ieee80211_wake_queues_by_reason(&local->hw,
528                                         IEEE80211_QUEUE_STOP_REASON_PS);
529 }
530
531 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
532 {
533         struct ieee80211_local *local =
534                 container_of(work, struct ieee80211_local,
535                              dynamic_ps_enable_work);
536         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
537
538         /* can only happen when PS was just disabled anyway */
539         if (!sdata)
540                 return;
541
542         if (local->hw.conf.flags & IEEE80211_CONF_PS)
543                 return;
544
545         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
546                 ieee80211_send_nullfunc(local, sdata, 1);
547
548         local->hw.conf.flags |= IEEE80211_CONF_PS;
549         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
550 }
551
552 void ieee80211_dynamic_ps_timer(unsigned long data)
553 {
554         struct ieee80211_local *local = (void *) data;
555
556         if (local->quiescing || local->suspended)
557                 return;
558
559         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
560 }
561
562 /* MLME */
563 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
564                                      struct ieee80211_if_managed *ifmgd,
565                                      u8 *wmm_param, size_t wmm_param_len)
566 {
567         struct ieee80211_tx_queue_params params;
568         size_t left;
569         int count;
570         u8 *pos;
571
572         if (local->hw.queues < 4)
573                 return;
574
575         if (!wmm_param)
576                 return;
577
578         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
579                 return;
580         count = wmm_param[6] & 0x0f;
581         if (count == ifmgd->wmm_last_param_set)
582                 return;
583         ifmgd->wmm_last_param_set = count;
584
585         pos = wmm_param + 8;
586         left = wmm_param_len - 8;
587
588         memset(&params, 0, sizeof(params));
589
590         local->wmm_acm = 0;
591         for (; left >= 4; left -= 4, pos += 4) {
592                 int aci = (pos[0] >> 5) & 0x03;
593                 int acm = (pos[0] >> 4) & 0x01;
594                 int queue;
595
596                 switch (aci) {
597                 case 1: /* AC_BK */
598                         queue = 3;
599                         if (acm)
600                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
601                         break;
602                 case 2: /* AC_VI */
603                         queue = 1;
604                         if (acm)
605                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
606                         break;
607                 case 3: /* AC_VO */
608                         queue = 0;
609                         if (acm)
610                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
611                         break;
612                 case 0: /* AC_BE */
613                 default:
614                         queue = 2;
615                         if (acm)
616                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
617                         break;
618                 }
619
620                 params.aifs = pos[0] & 0x0f;
621                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
622                 params.cw_min = ecw2cw(pos[1] & 0x0f);
623                 params.txop = get_unaligned_le16(pos + 2);
624 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
625                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
626                        "cWmin=%d cWmax=%d txop=%d\n",
627                        wiphy_name(local->hw.wiphy), queue, aci, acm,
628                        params.aifs, params.cw_min, params.cw_max, params.txop);
629 #endif
630                 if (drv_conf_tx(local, queue, &params) && local->ops->conf_tx)
631                         printk(KERN_DEBUG "%s: failed to set TX queue "
632                                "parameters for queue %d\n",
633                                wiphy_name(local->hw.wiphy), queue);
634         }
635 }
636
637 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
638                                            u16 capab, bool erp_valid, u8 erp)
639 {
640         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
641         u32 changed = 0;
642         bool use_protection;
643         bool use_short_preamble;
644         bool use_short_slot;
645
646         if (erp_valid) {
647                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
648                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
649         } else {
650                 use_protection = false;
651                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
652         }
653
654         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
655
656         if (use_protection != bss_conf->use_cts_prot) {
657                 bss_conf->use_cts_prot = use_protection;
658                 changed |= BSS_CHANGED_ERP_CTS_PROT;
659         }
660
661         if (use_short_preamble != bss_conf->use_short_preamble) {
662                 bss_conf->use_short_preamble = use_short_preamble;
663                 changed |= BSS_CHANGED_ERP_PREAMBLE;
664         }
665
666         if (use_short_slot != bss_conf->use_short_slot) {
667                 bss_conf->use_short_slot = use_short_slot;
668                 changed |= BSS_CHANGED_ERP_SLOT;
669         }
670
671         return changed;
672 }
673
674 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
675                                      struct cfg80211_bss *cbss,
676                                      u32 bss_info_changed)
677 {
678         struct ieee80211_bss *bss = (void *)cbss->priv;
679         struct ieee80211_local *local = sdata->local;
680
681         bss_info_changed |= BSS_CHANGED_ASSOC;
682         /* set timing information */
683         sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
684         sdata->vif.bss_conf.timestamp = cbss->tsf;
685         sdata->vif.bss_conf.dtim_period = bss->dtim_period;
686
687         bss_info_changed |= BSS_CHANGED_BEACON_INT;
688         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
689                 cbss->capability, bss->has_erp_value, bss->erp_value);
690
691         sdata->u.mgd.associated = cbss;
692         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
693
694         /* just to be sure */
695         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
696                                 IEEE80211_STA_BEACON_POLL);
697
698         /*
699          * Always handle WMM once after association regardless
700          * of the first value the AP uses. Setting -1 here has
701          * that effect because the AP values is an unsigned
702          * 4-bit value.
703          */
704         sdata->u.mgd.wmm_last_param_set = -1;
705
706         ieee80211_led_assoc(local, 1);
707
708         sdata->vif.bss_conf.assoc = 1;
709         /*
710          * For now just always ask the driver to update the basic rateset
711          * when we have associated, we aren't checking whether it actually
712          * changed or not.
713          */
714         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
715
716         /* And the BSSID changed - we're associated now */
717         bss_info_changed |= BSS_CHANGED_BSSID;
718
719         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
720
721         mutex_lock(&local->iflist_mtx);
722         ieee80211_recalc_ps(local, -1);
723         ieee80211_recalc_smps(local, sdata);
724         mutex_unlock(&local->iflist_mtx);
725
726         netif_start_queue(sdata->dev);
727         netif_carrier_on(sdata->dev);
728 }
729
730 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata)
731 {
732         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
733         struct ieee80211_local *local = sdata->local;
734         struct sta_info *sta;
735         u32 changed = 0, config_changed = 0;
736         u8 bssid[ETH_ALEN];
737
738         ASSERT_MGD_MTX(ifmgd);
739
740         if (WARN_ON(!ifmgd->associated))
741                 return;
742
743         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
744
745         ifmgd->associated = NULL;
746         memset(ifmgd->bssid, 0, ETH_ALEN);
747
748         /*
749          * we need to commit the associated = NULL change because the
750          * scan code uses that to determine whether this iface should
751          * go to/wake up from powersave or not -- and could otherwise
752          * wake the queues erroneously.
753          */
754         smp_mb();
755
756         /*
757          * Thus, we can only afterwards stop the queues -- to account
758          * for the case where another CPU is finishing a scan at this
759          * time -- we don't want the scan code to enable queues.
760          */
761
762         netif_stop_queue(sdata->dev);
763         netif_carrier_off(sdata->dev);
764
765         rcu_read_lock();
766         sta = sta_info_get(sdata, bssid);
767         if (sta)
768                 ieee80211_sta_tear_down_BA_sessions(sta);
769         rcu_read_unlock();
770
771         changed |= ieee80211_reset_erp_info(sdata);
772
773         ieee80211_led_assoc(local, 0);
774         changed |= BSS_CHANGED_ASSOC;
775         sdata->vif.bss_conf.assoc = false;
776
777         ieee80211_set_wmm_default(sdata);
778
779         /* channel(_type) changes are handled by ieee80211_hw_config */
780         local->oper_channel_type = NL80211_CHAN_NO_HT;
781
782         /* on the next assoc, re-program HT parameters */
783         sdata->ht_opmode_valid = false;
784
785         local->power_constr_level = 0;
786
787         del_timer_sync(&local->dynamic_ps_timer);
788         cancel_work_sync(&local->dynamic_ps_enable_work);
789
790         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
791                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
792                 config_changed |= IEEE80211_CONF_CHANGE_PS;
793         }
794
795         ieee80211_hw_config(local, config_changed);
796
797         /* And the BSSID changed -- not very interesting here */
798         changed |= BSS_CHANGED_BSSID;
799         ieee80211_bss_info_change_notify(sdata, changed);
800
801         rcu_read_lock();
802
803         sta = sta_info_get(sdata, bssid);
804         if (!sta) {
805                 rcu_read_unlock();
806                 return;
807         }
808
809         sta_info_unlink(&sta);
810
811         rcu_read_unlock();
812
813         sta_info_destroy(sta);
814 }
815
816 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
817                              struct ieee80211_hdr *hdr)
818 {
819         /*
820          * We can postpone the mgd.timer whenever receiving unicast frames
821          * from AP because we know that the connection is working both ways
822          * at that time. But multicast frames (and hence also beacons) must
823          * be ignored here, because we need to trigger the timer during
824          * data idle periods for sending the periodic probe request to the
825          * AP we're connected to.
826          */
827         if (is_multicast_ether_addr(hdr->addr1))
828                 return;
829
830         mod_timer(&sdata->u.mgd.conn_mon_timer,
831                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
832 }
833
834 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
835 {
836         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
837         const u8 *ssid;
838
839         ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
840         ieee80211_send_probe_req(sdata, ifmgd->associated->bssid,
841                                  ssid + 2, ssid[1], NULL, 0);
842
843         ifmgd->probe_send_count++;
844         ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
845         run_again(ifmgd, ifmgd->probe_timeout);
846 }
847
848 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
849                                    bool beacon)
850 {
851         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
852         bool already = false;
853
854         if (!ieee80211_sdata_running(sdata))
855                 return;
856
857         if (sdata->local->scanning)
858                 return;
859
860         mutex_lock(&ifmgd->mtx);
861
862         if (!ifmgd->associated)
863                 goto out;
864
865 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
866         if (beacon && net_ratelimit())
867                 printk(KERN_DEBUG "%s: detected beacon loss from AP "
868                        "- sending probe request\n", sdata->name);
869 #endif
870
871         /*
872          * The driver/our work has already reported this event or the
873          * connection monitoring has kicked in and we have already sent
874          * a probe request. Or maybe the AP died and the driver keeps
875          * reporting until we disassociate...
876          *
877          * In either case we have to ignore the current call to this
878          * function (except for setting the correct probe reason bit)
879          * because otherwise we would reset the timer every time and
880          * never check whether we received a probe response!
881          */
882         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
883                             IEEE80211_STA_CONNECTION_POLL))
884                 already = true;
885
886         if (beacon)
887                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
888         else
889                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
890
891         if (already)
892                 goto out;
893
894         mutex_lock(&sdata->local->iflist_mtx);
895         ieee80211_recalc_ps(sdata->local, -1);
896         mutex_unlock(&sdata->local->iflist_mtx);
897
898         ifmgd->probe_send_count = 0;
899         ieee80211_mgd_probe_ap_send(sdata);
900  out:
901         mutex_unlock(&ifmgd->mtx);
902 }
903
904 void ieee80211_beacon_loss_work(struct work_struct *work)
905 {
906         struct ieee80211_sub_if_data *sdata =
907                 container_of(work, struct ieee80211_sub_if_data,
908                              u.mgd.beacon_loss_work);
909
910         ieee80211_mgd_probe_ap(sdata, true);
911 }
912
913 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
914 {
915         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
916
917         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work);
918 }
919 EXPORT_SYMBOL(ieee80211_beacon_loss);
920
921 static enum rx_mgmt_action __must_check
922 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
923                          struct ieee80211_mgmt *mgmt, size_t len)
924 {
925         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
926         const u8 *bssid = NULL;
927         u16 reason_code;
928
929         if (len < 24 + 2)
930                 return RX_MGMT_NONE;
931
932         ASSERT_MGD_MTX(ifmgd);
933
934         bssid = ifmgd->associated->bssid;
935
936         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
937
938         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
939                         sdata->name, bssid, reason_code);
940
941         ieee80211_set_disassoc(sdata);
942         ieee80211_recalc_idle(sdata->local);
943
944         return RX_MGMT_CFG80211_DEAUTH;
945 }
946
947
948 static enum rx_mgmt_action __must_check
949 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
950                            struct ieee80211_mgmt *mgmt, size_t len)
951 {
952         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
953         u16 reason_code;
954
955         if (len < 24 + 2)
956                 return RX_MGMT_NONE;
957
958         ASSERT_MGD_MTX(ifmgd);
959
960         if (WARN_ON(!ifmgd->associated))
961                 return RX_MGMT_NONE;
962
963         if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
964                 return RX_MGMT_NONE;
965
966         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
967
968         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
969                         sdata->name, mgmt->sa, reason_code);
970
971         ieee80211_set_disassoc(sdata);
972         ieee80211_recalc_idle(sdata->local);
973         return RX_MGMT_CFG80211_DISASSOC;
974 }
975
976
977 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
978                                     struct ieee80211_mgmt *mgmt, size_t len)
979 {
980         struct ieee80211_sub_if_data *sdata = wk->sdata;
981         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
982         struct ieee80211_local *local = sdata->local;
983         struct ieee80211_supported_band *sband;
984         struct sta_info *sta;
985         struct cfg80211_bss *cbss = wk->assoc.bss;
986         u8 *pos;
987         u32 rates, basic_rates;
988         u16 capab_info, aid;
989         struct ieee802_11_elems elems;
990         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
991         u32 changed = 0;
992         int i, j, err;
993         bool have_higher_than_11mbit = false;
994         u16 ap_ht_cap_flags;
995
996         /* AssocResp and ReassocResp have identical structure */
997
998         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
999         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1000
1001         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1002                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1003                        "set\n", sdata->name, aid);
1004         aid &= ~(BIT(15) | BIT(14));
1005
1006         pos = mgmt->u.assoc_resp.variable;
1007         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1008
1009         if (!elems.supp_rates) {
1010                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1011                        sdata->name);
1012                 return false;
1013         }
1014
1015         ifmgd->aid = aid;
1016
1017         sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1018         if (!sta) {
1019                 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1020                        " the AP\n", sdata->name);
1021                 return false;
1022         }
1023
1024         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1025                            WLAN_STA_ASSOC_AP);
1026         if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1027                 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1028
1029         rates = 0;
1030         basic_rates = 0;
1031         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1032
1033         for (i = 0; i < elems.supp_rates_len; i++) {
1034                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1035                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1036
1037                 if (rate > 110)
1038                         have_higher_than_11mbit = true;
1039
1040                 for (j = 0; j < sband->n_bitrates; j++) {
1041                         if (sband->bitrates[j].bitrate == rate) {
1042                                 rates |= BIT(j);
1043                                 if (is_basic)
1044                                         basic_rates |= BIT(j);
1045                                 break;
1046                         }
1047                 }
1048         }
1049
1050         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1051                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1052                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1053
1054                 if (rate > 110)
1055                         have_higher_than_11mbit = true;
1056
1057                 for (j = 0; j < sband->n_bitrates; j++) {
1058                         if (sband->bitrates[j].bitrate == rate) {
1059                                 rates |= BIT(j);
1060                                 if (is_basic)
1061                                         basic_rates |= BIT(j);
1062                                 break;
1063                         }
1064                 }
1065         }
1066
1067         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1068         sdata->vif.bss_conf.basic_rates = basic_rates;
1069
1070         /* cf. IEEE 802.11 9.2.12 */
1071         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1072             have_higher_than_11mbit)
1073                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1074         else
1075                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1076
1077         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1078                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1079                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1080
1081         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1082
1083         rate_control_rate_init(sta);
1084
1085         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1086                 set_sta_flags(sta, WLAN_STA_MFP);
1087
1088         if (elems.wmm_param)
1089                 set_sta_flags(sta, WLAN_STA_WME);
1090
1091         err = sta_info_insert(sta);
1092         sta = NULL;
1093         if (err) {
1094                 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1095                        " the AP (error %d)\n", sdata->name, err);
1096                 return RX_MGMT_CFG80211_ASSOC_ERROR;
1097         }
1098
1099         if (elems.wmm_param)
1100                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1101                                          elems.wmm_param_len);
1102         else
1103                 ieee80211_set_wmm_default(sdata);
1104
1105         if (elems.ht_info_elem && elems.wmm_param &&
1106             (sdata->local->hw.queues >= 4) &&
1107             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1108                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1109                                                cbss->bssid, ap_ht_cap_flags);
1110
1111         /* set AID and assoc capability,
1112          * ieee80211_set_associated() will tell the driver */
1113         bss_conf->aid = aid;
1114         bss_conf->assoc_capability = capab_info;
1115         ieee80211_set_associated(sdata, cbss, changed);
1116
1117         /*
1118          * Start timer to probe the connection to the AP now.
1119          * Also start the timer that will detect beacon loss.
1120          */
1121         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1122         mod_beacon_timer(sdata);
1123
1124         return true;
1125 }
1126
1127
1128 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1129                                   struct ieee80211_mgmt *mgmt,
1130                                   size_t len,
1131                                   struct ieee80211_rx_status *rx_status,
1132                                   struct ieee802_11_elems *elems,
1133                                   bool beacon)
1134 {
1135         struct ieee80211_local *local = sdata->local;
1136         int freq;
1137         struct ieee80211_bss *bss;
1138         struct ieee80211_channel *channel;
1139
1140         if (elems->ds_params && elems->ds_params_len == 1)
1141                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1142         else
1143                 freq = rx_status->freq;
1144
1145         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1146
1147         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1148                 return;
1149
1150         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1151                                         channel, beacon);
1152         if (bss)
1153                 ieee80211_rx_bss_put(local, bss);
1154
1155         if (!sdata->u.mgd.associated)
1156                 return;
1157
1158         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1159             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1160                                                         ETH_ALEN) == 0)) {
1161                 struct ieee80211_channel_sw_ie *sw_elem =
1162                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1163                 ieee80211_sta_process_chanswitch(sdata, sw_elem, bss);
1164         }
1165 }
1166
1167
1168 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1169                                          struct sk_buff *skb)
1170 {
1171         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1172         struct ieee80211_if_managed *ifmgd;
1173         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1174         size_t baselen, len = skb->len;
1175         struct ieee802_11_elems elems;
1176
1177         ifmgd = &sdata->u.mgd;
1178
1179         ASSERT_MGD_MTX(ifmgd);
1180
1181         if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1182                 return; /* ignore ProbeResp to foreign address */
1183
1184         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1185         if (baselen > len)
1186                 return;
1187
1188         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1189                                 &elems);
1190
1191         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1192
1193         if (ifmgd->associated &&
1194             memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0 &&
1195             ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1196                             IEEE80211_STA_CONNECTION_POLL)) {
1197                 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1198                                   IEEE80211_STA_BEACON_POLL);
1199                 mutex_lock(&sdata->local->iflist_mtx);
1200                 ieee80211_recalc_ps(sdata->local, -1);
1201                 mutex_unlock(&sdata->local->iflist_mtx);
1202                 /*
1203                  * We've received a probe response, but are not sure whether
1204                  * we have or will be receiving any beacons or data, so let's
1205                  * schedule the timers again, just in case.
1206                  */
1207                 mod_beacon_timer(sdata);
1208                 mod_timer(&ifmgd->conn_mon_timer,
1209                           round_jiffies_up(jiffies +
1210                                            IEEE80211_CONNECTION_IDLE_TIME));
1211         }
1212 }
1213
1214 /*
1215  * This is the canonical list of information elements we care about,
1216  * the filter code also gives us all changes to the Microsoft OUI
1217  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1218  *
1219  * We implement beacon filtering in software since that means we can
1220  * avoid processing the frame here and in cfg80211, and userspace
1221  * will not be able to tell whether the hardware supports it or not.
1222  *
1223  * XXX: This list needs to be dynamic -- userspace needs to be able to
1224  *      add items it requires. It also needs to be able to tell us to
1225  *      look out for other vendor IEs.
1226  */
1227 static const u64 care_about_ies =
1228         (1ULL << WLAN_EID_COUNTRY) |
1229         (1ULL << WLAN_EID_ERP_INFO) |
1230         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1231         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1232         (1ULL << WLAN_EID_HT_CAPABILITY) |
1233         (1ULL << WLAN_EID_HT_INFORMATION);
1234
1235 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1236                                      struct ieee80211_mgmt *mgmt,
1237                                      size_t len,
1238                                      struct ieee80211_rx_status *rx_status)
1239 {
1240         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1241         size_t baselen;
1242         struct ieee802_11_elems elems;
1243         struct ieee80211_local *local = sdata->local;
1244         u32 changed = 0;
1245         bool erp_valid, directed_tim = false;
1246         u8 erp_value = 0;
1247         u32 ncrc;
1248         u8 *bssid;
1249
1250         ASSERT_MGD_MTX(ifmgd);
1251
1252         /* Process beacon from the current BSS */
1253         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1254         if (baselen > len)
1255                 return;
1256
1257         if (rx_status->freq != local->hw.conf.channel->center_freq)
1258                 return;
1259
1260         /*
1261          * We might have received a number of frames, among them a
1262          * disassoc frame and a beacon...
1263          */
1264         if (!ifmgd->associated)
1265                 return;
1266
1267         bssid = ifmgd->associated->bssid;
1268
1269         /*
1270          * And in theory even frames from a different AP we were just
1271          * associated to a split-second ago!
1272          */
1273         if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1274                 return;
1275
1276         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1277 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1278                 if (net_ratelimit()) {
1279                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1280                                "to a received beacon\n", sdata->name);
1281                 }
1282 #endif
1283                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1284                 mutex_lock(&local->iflist_mtx);
1285                 ieee80211_recalc_ps(local, -1);
1286                 mutex_unlock(&local->iflist_mtx);
1287         }
1288
1289         /*
1290          * Push the beacon loss detection into the future since
1291          * we are processing a beacon from the AP just now.
1292          */
1293         mod_beacon_timer(sdata);
1294
1295         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1296         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1297                                           len - baselen, &elems,
1298                                           care_about_ies, ncrc);
1299
1300         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1301                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1302                                                    ifmgd->aid);
1303
1304         if (ncrc != ifmgd->beacon_crc) {
1305                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1306                                       true);
1307
1308                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1309                                          elems.wmm_param_len);
1310         }
1311
1312         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1313                 if (directed_tim) {
1314                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1315                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1316                                 ieee80211_hw_config(local,
1317                                                     IEEE80211_CONF_CHANGE_PS);
1318                                 ieee80211_send_nullfunc(local, sdata, 0);
1319                         } else {
1320                                 local->pspolling = true;
1321
1322                                 /*
1323                                  * Here is assumed that the driver will be
1324                                  * able to send ps-poll frame and receive a
1325                                  * response even though power save mode is
1326                                  * enabled, but some drivers might require
1327                                  * to disable power save here. This needs
1328                                  * to be investigated.
1329                                  */
1330                                 ieee80211_send_pspoll(local, sdata);
1331                         }
1332                 }
1333         }
1334
1335         if (ncrc == ifmgd->beacon_crc)
1336                 return;
1337         ifmgd->beacon_crc = ncrc;
1338
1339         if (elems.erp_info && elems.erp_info_len >= 1) {
1340                 erp_valid = true;
1341                 erp_value = elems.erp_info[0];
1342         } else {
1343                 erp_valid = false;
1344         }
1345         changed |= ieee80211_handle_bss_capability(sdata,
1346                         le16_to_cpu(mgmt->u.beacon.capab_info),
1347                         erp_valid, erp_value);
1348
1349
1350         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1351             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1352                 struct sta_info *sta;
1353                 struct ieee80211_supported_band *sband;
1354                 u16 ap_ht_cap_flags;
1355
1356                 rcu_read_lock();
1357
1358                 sta = sta_info_get(sdata, bssid);
1359                 if (WARN_ON(!sta)) {
1360                         rcu_read_unlock();
1361                         return;
1362                 }
1363
1364                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1365
1366                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1367                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1368
1369                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1370
1371                 rcu_read_unlock();
1372
1373                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1374                                                bssid, ap_ht_cap_flags);
1375         }
1376
1377         /* Note: country IE parsing is done for us by cfg80211 */
1378         if (elems.country_elem) {
1379                 /* TODO: IBSS also needs this */
1380                 if (elems.pwr_constr_elem)
1381                         ieee80211_handle_pwr_constr(sdata,
1382                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1383                                 elems.pwr_constr_elem,
1384                                 elems.pwr_constr_elem_len);
1385         }
1386
1387         ieee80211_bss_info_change_notify(sdata, changed);
1388 }
1389
1390 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1391                                           struct sk_buff *skb)
1392 {
1393         struct ieee80211_local *local = sdata->local;
1394         struct ieee80211_mgmt *mgmt;
1395         u16 fc;
1396
1397         if (skb->len < 24)
1398                 return RX_DROP_MONITOR;
1399
1400         mgmt = (struct ieee80211_mgmt *) skb->data;
1401         fc = le16_to_cpu(mgmt->frame_control);
1402
1403         switch (fc & IEEE80211_FCTL_STYPE) {
1404         case IEEE80211_STYPE_PROBE_RESP:
1405         case IEEE80211_STYPE_BEACON:
1406         case IEEE80211_STYPE_DEAUTH:
1407         case IEEE80211_STYPE_DISASSOC:
1408         case IEEE80211_STYPE_ACTION:
1409                 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1410                 ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
1411                 return RX_QUEUED;
1412         }
1413
1414         return RX_DROP_MONITOR;
1415 }
1416
1417 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1418                                          struct sk_buff *skb)
1419 {
1420         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1421         struct ieee80211_rx_status *rx_status;
1422         struct ieee80211_mgmt *mgmt;
1423         enum rx_mgmt_action rma = RX_MGMT_NONE;
1424         u16 fc;
1425
1426         rx_status = (struct ieee80211_rx_status *) skb->cb;
1427         mgmt = (struct ieee80211_mgmt *) skb->data;
1428         fc = le16_to_cpu(mgmt->frame_control);
1429
1430         mutex_lock(&ifmgd->mtx);
1431
1432         if (ifmgd->associated &&
1433             memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1434                 switch (fc & IEEE80211_FCTL_STYPE) {
1435                 case IEEE80211_STYPE_BEACON:
1436                         ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1437                                                  rx_status);
1438                         break;
1439                 case IEEE80211_STYPE_PROBE_RESP:
1440                         ieee80211_rx_mgmt_probe_resp(sdata, skb);
1441                         break;
1442                 case IEEE80211_STYPE_DEAUTH:
1443                         rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1444                         break;
1445                 case IEEE80211_STYPE_DISASSOC:
1446                         rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1447                         break;
1448                 case IEEE80211_STYPE_ACTION:
1449                         /* XXX: differentiate, can only happen for CSA now! */
1450                         ieee80211_sta_process_chanswitch(sdata,
1451                                         &mgmt->u.action.u.chan_switch.sw_elem,
1452                                         (void *)ifmgd->associated->priv);
1453                         break;
1454                 }
1455                 mutex_unlock(&ifmgd->mtx);
1456
1457                 switch (rma) {
1458                 case RX_MGMT_NONE:
1459                         /* no action */
1460                         break;
1461                 case RX_MGMT_CFG80211_DEAUTH:
1462                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1463                         break;
1464                 case RX_MGMT_CFG80211_DISASSOC:
1465                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1466                         break;
1467                 default:
1468                         WARN(1, "unexpected: %d", rma);
1469                 }
1470                 goto out;
1471         }
1472
1473         mutex_unlock(&ifmgd->mtx);
1474
1475         if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1476             (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH)
1477                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1478
1479  out:
1480         kfree_skb(skb);
1481 }
1482
1483 static void ieee80211_sta_timer(unsigned long data)
1484 {
1485         struct ieee80211_sub_if_data *sdata =
1486                 (struct ieee80211_sub_if_data *) data;
1487         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1488         struct ieee80211_local *local = sdata->local;
1489
1490         if (local->quiescing) {
1491                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1492                 return;
1493         }
1494
1495         ieee80211_queue_work(&local->hw, &ifmgd->work);
1496 }
1497
1498 static void ieee80211_sta_work(struct work_struct *work)
1499 {
1500         struct ieee80211_sub_if_data *sdata =
1501                 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
1502         struct ieee80211_local *local = sdata->local;
1503         struct ieee80211_if_managed *ifmgd;
1504         struct sk_buff *skb;
1505
1506         if (!ieee80211_sdata_running(sdata))
1507                 return;
1508
1509         if (local->scanning)
1510                 return;
1511
1512         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1513                 return;
1514
1515         /*
1516          * ieee80211_queue_work() should have picked up most cases,
1517          * here we'll pick the the rest.
1518          */
1519         if (WARN(local->suspended, "STA MLME work scheduled while "
1520                  "going to suspend\n"))
1521                 return;
1522
1523         ifmgd = &sdata->u.mgd;
1524
1525         /* first process frames to avoid timing out while a frame is pending */
1526         while ((skb = skb_dequeue(&ifmgd->skb_queue)))
1527                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1528
1529         /* then process the rest of the work */
1530         mutex_lock(&ifmgd->mtx);
1531
1532         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1533                             IEEE80211_STA_CONNECTION_POLL) &&
1534             ifmgd->associated) {
1535                 u8 bssid[ETH_ALEN];
1536
1537                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1538                 if (time_is_after_jiffies(ifmgd->probe_timeout))
1539                         run_again(ifmgd, ifmgd->probe_timeout);
1540
1541                 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
1542 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1543                         printk(KERN_DEBUG "No probe response from AP %pM"
1544                                 " after %dms, try %d\n", bssid,
1545                                 (1000 * IEEE80211_PROBE_WAIT)/HZ,
1546                                 ifmgd->probe_send_count);
1547 #endif
1548                         ieee80211_mgd_probe_ap_send(sdata);
1549                 } else {
1550                         /*
1551                          * We actually lost the connection ... or did we?
1552                          * Let's make sure!
1553                          */
1554                         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1555                                           IEEE80211_STA_BEACON_POLL);
1556                         printk(KERN_DEBUG "No probe response from AP %pM"
1557                                 " after %dms, disconnecting.\n",
1558                                 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
1559                         ieee80211_set_disassoc(sdata);
1560                         ieee80211_recalc_idle(local);
1561                         mutex_unlock(&ifmgd->mtx);
1562                         /*
1563                          * must be outside lock due to cfg80211,
1564                          * but that's not a problem.
1565                          */
1566                         ieee80211_send_deauth_disassoc(sdata, bssid,
1567                                         IEEE80211_STYPE_DEAUTH,
1568                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1569                                         NULL);
1570                         mutex_lock(&ifmgd->mtx);
1571                 }
1572         }
1573
1574         mutex_unlock(&ifmgd->mtx);
1575 }
1576
1577 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
1578 {
1579         struct ieee80211_sub_if_data *sdata =
1580                 (struct ieee80211_sub_if_data *) data;
1581         struct ieee80211_local *local = sdata->local;
1582
1583         if (local->quiescing)
1584                 return;
1585
1586         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work);
1587 }
1588
1589 static void ieee80211_sta_conn_mon_timer(unsigned long data)
1590 {
1591         struct ieee80211_sub_if_data *sdata =
1592                 (struct ieee80211_sub_if_data *) data;
1593         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1594         struct ieee80211_local *local = sdata->local;
1595
1596         if (local->quiescing)
1597                 return;
1598
1599         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
1600 }
1601
1602 static void ieee80211_sta_monitor_work(struct work_struct *work)
1603 {
1604         struct ieee80211_sub_if_data *sdata =
1605                 container_of(work, struct ieee80211_sub_if_data,
1606                              u.mgd.monitor_work);
1607
1608         ieee80211_mgd_probe_ap(sdata, false);
1609 }
1610
1611 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
1612 {
1613         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1614                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
1615                                         IEEE80211_STA_CONNECTION_POLL);
1616
1617                 /* let's probe the connection once */
1618                 ieee80211_queue_work(&sdata->local->hw,
1619                            &sdata->u.mgd.monitor_work);
1620                 /* and do all the other regular work too */
1621                 ieee80211_queue_work(&sdata->local->hw,
1622                            &sdata->u.mgd.work);
1623         }
1624 }
1625
1626 #ifdef CONFIG_PM
1627 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
1628 {
1629         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1630
1631         /*
1632          * we need to use atomic bitops for the running bits
1633          * only because both timers might fire at the same
1634          * time -- the code here is properly synchronised.
1635          */
1636
1637         cancel_work_sync(&ifmgd->work);
1638         cancel_work_sync(&ifmgd->beacon_loss_work);
1639         if (del_timer_sync(&ifmgd->timer))
1640                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1641
1642         cancel_work_sync(&ifmgd->chswitch_work);
1643         if (del_timer_sync(&ifmgd->chswitch_timer))
1644                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
1645
1646         cancel_work_sync(&ifmgd->monitor_work);
1647         /* these will just be re-established on connection */
1648         del_timer_sync(&ifmgd->conn_mon_timer);
1649         del_timer_sync(&ifmgd->bcn_mon_timer);
1650 }
1651
1652 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
1653 {
1654         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1655
1656         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
1657                 add_timer(&ifmgd->timer);
1658         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
1659                 add_timer(&ifmgd->chswitch_timer);
1660 }
1661 #endif
1662
1663 /* interface setup */
1664 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
1665 {
1666         struct ieee80211_if_managed *ifmgd;
1667
1668         ifmgd = &sdata->u.mgd;
1669         INIT_WORK(&ifmgd->work, ieee80211_sta_work);
1670         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
1671         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
1672         INIT_WORK(&ifmgd->beacon_loss_work, ieee80211_beacon_loss_work);
1673         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
1674                     (unsigned long) sdata);
1675         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
1676                     (unsigned long) sdata);
1677         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
1678                     (unsigned long) sdata);
1679         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
1680                     (unsigned long) sdata);
1681         skb_queue_head_init(&ifmgd->skb_queue);
1682
1683         ifmgd->flags = 0;
1684
1685         mutex_init(&ifmgd->mtx);
1686
1687         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
1688                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
1689         else
1690                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
1691 }
1692
1693 /* scan finished notification */
1694 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
1695 {
1696         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
1697
1698         /* Restart STA timers */
1699         rcu_read_lock();
1700         list_for_each_entry_rcu(sdata, &local->interfaces, list)
1701                 ieee80211_restart_sta_timer(sdata);
1702         rcu_read_unlock();
1703 }
1704
1705 int ieee80211_max_network_latency(struct notifier_block *nb,
1706                                   unsigned long data, void *dummy)
1707 {
1708         s32 latency_usec = (s32) data;
1709         struct ieee80211_local *local =
1710                 container_of(nb, struct ieee80211_local,
1711                              network_latency_notifier);
1712
1713         mutex_lock(&local->iflist_mtx);
1714         ieee80211_recalc_ps(local, latency_usec);
1715         mutex_unlock(&local->iflist_mtx);
1716
1717         return 0;
1718 }
1719
1720 /* config hooks */
1721 static enum work_done_result
1722 ieee80211_probe_auth_done(struct ieee80211_work *wk,
1723                           struct sk_buff *skb)
1724 {
1725         if (!skb) {
1726                 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
1727                 return WORK_DONE_DESTROY;
1728         }
1729
1730         if (wk->type == IEEE80211_WORK_AUTH) {
1731                 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
1732                 return WORK_DONE_DESTROY;
1733         }
1734
1735         mutex_lock(&wk->sdata->u.mgd.mtx);
1736         ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
1737         mutex_unlock(&wk->sdata->u.mgd.mtx);
1738
1739         wk->type = IEEE80211_WORK_AUTH;
1740         wk->probe_auth.tries = 0;
1741         return WORK_DONE_REQUEUE;
1742 }
1743
1744 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
1745                        struct cfg80211_auth_request *req)
1746 {
1747         const u8 *ssid;
1748         struct ieee80211_work *wk;
1749         u16 auth_alg;
1750
1751         switch (req->auth_type) {
1752         case NL80211_AUTHTYPE_OPEN_SYSTEM:
1753                 auth_alg = WLAN_AUTH_OPEN;
1754                 break;
1755         case NL80211_AUTHTYPE_SHARED_KEY:
1756                 auth_alg = WLAN_AUTH_SHARED_KEY;
1757                 break;
1758         case NL80211_AUTHTYPE_FT:
1759                 auth_alg = WLAN_AUTH_FT;
1760                 break;
1761         case NL80211_AUTHTYPE_NETWORK_EAP:
1762                 auth_alg = WLAN_AUTH_LEAP;
1763                 break;
1764         default:
1765                 return -EOPNOTSUPP;
1766         }
1767
1768         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
1769         if (!wk)
1770                 return -ENOMEM;
1771
1772         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);;
1773
1774         if (req->ie && req->ie_len) {
1775                 memcpy(wk->ie, req->ie, req->ie_len);
1776                 wk->ie_len = req->ie_len;
1777         }
1778
1779         if (req->key && req->key_len) {
1780                 wk->probe_auth.key_len = req->key_len;
1781                 wk->probe_auth.key_idx = req->key_idx;
1782                 memcpy(wk->probe_auth.key, req->key, req->key_len);
1783         }
1784
1785         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
1786         memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
1787         wk->probe_auth.ssid_len = ssid[1];
1788
1789         wk->probe_auth.algorithm = auth_alg;
1790         wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
1791
1792         wk->type = IEEE80211_WORK_DIRECT_PROBE;
1793         wk->chan = req->bss->channel;
1794         wk->sdata = sdata;
1795         wk->done = ieee80211_probe_auth_done;
1796
1797         /*
1798          * XXX: if still associated need to tell AP that we're going
1799          *      to sleep and then change channel etc.
1800          *      For now switch channel here, later will be handled
1801          *      by submitting this as an off-channel work item.
1802          */
1803         sdata->local->oper_channel = req->bss->channel;
1804         ieee80211_hw_config(sdata->local, 0);
1805
1806         ieee80211_add_work(wk);
1807         return 0;
1808 }
1809
1810 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
1811                                                   struct sk_buff *skb)
1812 {
1813         struct ieee80211_mgmt *mgmt;
1814         u16 status;
1815
1816         if (!skb) {
1817                 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
1818                 return WORK_DONE_DESTROY;
1819         }
1820
1821         mgmt = (void *)skb->data;
1822         status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1823
1824         if (status == WLAN_STATUS_SUCCESS) {
1825                 mutex_lock(&wk->sdata->u.mgd.mtx);
1826                 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
1827                         mutex_unlock(&wk->sdata->u.mgd.mtx);
1828                         /* oops -- internal error -- send timeout for now */
1829                         cfg80211_send_assoc_timeout(wk->sdata->dev,
1830                                                     wk->filter_ta);
1831                         return WORK_DONE_DESTROY;
1832                 }
1833                 mutex_unlock(&wk->sdata->u.mgd.mtx);
1834         }
1835
1836         cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
1837         return WORK_DONE_DESTROY;
1838 }
1839
1840 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
1841                         struct cfg80211_assoc_request *req)
1842 {
1843         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1844         struct ieee80211_bss *bss = (void *)req->bss->priv;
1845         struct ieee80211_work *wk;
1846         const u8 *ssid;
1847         int i;
1848
1849         mutex_lock(&ifmgd->mtx);
1850         if (ifmgd->associated) {
1851                 mutex_unlock(&ifmgd->mtx);
1852                 return -EALREADY;
1853         }
1854         mutex_unlock(&ifmgd->mtx);
1855
1856         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
1857         if (!wk)
1858                 return -ENOMEM;
1859
1860         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
1861
1862         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
1863                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
1864                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
1865                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
1866                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
1867
1868
1869         if (req->ie && req->ie_len) {
1870                 memcpy(wk->ie, req->ie, req->ie_len);
1871                 wk->ie_len = req->ie_len;
1872         } else
1873                 wk->ie_len = 0;
1874
1875         wk->assoc.bss = req->bss;
1876
1877         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
1878
1879         /* new association always uses requested smps mode */
1880         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
1881                 if (ifmgd->powersave)
1882                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
1883                 else
1884                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
1885         } else
1886                 ifmgd->ap_smps = ifmgd->req_smps;
1887
1888         wk->assoc.smps = ifmgd->ap_smps;
1889         /*
1890          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
1891          * We still associate in non-HT mode (11a/b/g) if any one of these
1892          * ciphers is configured as pairwise.
1893          * We can set this to true for non-11n hardware, that'll be checked
1894          * separately along with the peer capabilities.
1895          */
1896         wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
1897         wk->assoc.capability = req->bss->capability;
1898         wk->assoc.wmm_used = bss->wmm_used;
1899         wk->assoc.supp_rates = bss->supp_rates;
1900         wk->assoc.supp_rates_len = bss->supp_rates_len;
1901         wk->assoc.ht_information_ie =
1902                 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
1903
1904         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
1905         memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
1906         wk->assoc.ssid_len = ssid[1];
1907
1908         if (req->prev_bssid)
1909                 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
1910
1911         wk->type = IEEE80211_WORK_ASSOC;
1912         wk->chan = req->bss->channel;
1913         wk->sdata = sdata;
1914         wk->done = ieee80211_assoc_done;
1915
1916         if (req->use_mfp) {
1917                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
1918                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
1919         } else {
1920                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
1921                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
1922         }
1923
1924         if (req->crypto.control_port)
1925                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
1926         else
1927                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
1928
1929         sdata->local->oper_channel = req->bss->channel;
1930         ieee80211_hw_config(sdata->local, 0);
1931
1932         ieee80211_add_work(wk);
1933         return 0;
1934 }
1935
1936 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
1937                          struct cfg80211_deauth_request *req,
1938                          void *cookie)
1939 {
1940         struct ieee80211_local *local = sdata->local;
1941         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1942         struct ieee80211_work *wk;
1943         const u8 *bssid = req->bss->bssid;
1944
1945         mutex_lock(&ifmgd->mtx);
1946
1947         if (ifmgd->associated == req->bss) {
1948                 bssid = req->bss->bssid;
1949                 ieee80211_set_disassoc(sdata);
1950                 mutex_unlock(&ifmgd->mtx);
1951         } else {
1952                 bool not_auth_yet = false;
1953
1954                 mutex_unlock(&ifmgd->mtx);
1955
1956                 mutex_lock(&local->work_mtx);
1957                 list_for_each_entry(wk, &local->work_list, list) {
1958                         if (wk->type != IEEE80211_WORK_DIRECT_PROBE)
1959                                 continue;
1960                         if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
1961                                 continue;
1962                         not_auth_yet = true;
1963                         list_del(&wk->list);
1964                         free_work(wk);
1965                         break;
1966                 }
1967                 mutex_unlock(&local->work_mtx);
1968
1969                 /*
1970                  * If somebody requests authentication and we haven't
1971                  * sent out an auth frame yet there's no need to send
1972                  * out a deauth frame either. If the state was PROBE,
1973                  * then this is the case. If it's AUTH we have sent a
1974                  * frame, and if it's IDLE we have completed the auth
1975                  * process already.
1976                  */
1977                 if (not_auth_yet) {
1978                         __cfg80211_auth_canceled(sdata->dev, bssid);
1979                         return 0;
1980                 }
1981         }
1982
1983         printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
1984                sdata->name, bssid, req->reason_code);
1985
1986         ieee80211_send_deauth_disassoc(sdata, bssid,
1987                         IEEE80211_STYPE_DEAUTH, req->reason_code,
1988                         cookie);
1989
1990         ieee80211_recalc_idle(sdata->local);
1991
1992         return 0;
1993 }
1994
1995 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
1996                            struct cfg80211_disassoc_request *req,
1997                            void *cookie)
1998 {
1999         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2000
2001         mutex_lock(&ifmgd->mtx);
2002
2003         /*
2004          * cfg80211 should catch this ... but it's racy since
2005          * we can receive a disassoc frame, process it, hand it
2006          * to cfg80211 while that's in a locked section already
2007          * trying to tell us that the user wants to disconnect.
2008          */
2009         if (ifmgd->associated != req->bss) {
2010                 mutex_unlock(&ifmgd->mtx);
2011                 return -ENOLINK;
2012         }
2013
2014         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2015                sdata->name, req->bss->bssid, req->reason_code);
2016
2017         ieee80211_set_disassoc(sdata);
2018
2019         mutex_unlock(&ifmgd->mtx);
2020
2021         ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2022                         IEEE80211_STYPE_DISASSOC, req->reason_code,
2023                         cookie);
2024
2025         ieee80211_recalc_idle(sdata->local);
2026
2027         return 0;
2028 }