be2net: Add link test to list of ethtool self tests.
[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.flags & (IEEE80211_STA_BEACON_POLL |
488                                     IEEE80211_STA_CONNECTION_POLL))) {
489                 s32 beaconint_us;
490
491                 if (latency < 0)
492                         latency = pm_qos_requirement(PM_QOS_NETWORK_LATENCY);
493
494                 beaconint_us = ieee80211_tu_to_usec(
495                                         found->vif.bss_conf.beacon_int);
496
497                 if (beaconint_us > latency) {
498                         local->ps_sdata = NULL;
499                 } else {
500                         u8 dtimper = found->vif.bss_conf.dtim_period;
501                         int maxslp = 1;
502
503                         if (dtimper > 1)
504                                 maxslp = min_t(int, dtimper,
505                                                     latency / beaconint_us);
506
507                         local->hw.conf.max_sleep_period = maxslp;
508                         local->ps_sdata = found;
509                 }
510         } else {
511                 local->ps_sdata = NULL;
512         }
513
514  change:
515         ieee80211_change_ps(local);
516 }
517
518 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
519 {
520         struct ieee80211_local *local =
521                 container_of(work, struct ieee80211_local,
522                              dynamic_ps_disable_work);
523
524         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
525                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
526                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
527         }
528
529         ieee80211_wake_queues_by_reason(&local->hw,
530                                         IEEE80211_QUEUE_STOP_REASON_PS);
531 }
532
533 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
534 {
535         struct ieee80211_local *local =
536                 container_of(work, struct ieee80211_local,
537                              dynamic_ps_enable_work);
538         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
539
540         /* can only happen when PS was just disabled anyway */
541         if (!sdata)
542                 return;
543
544         if (local->hw.conf.flags & IEEE80211_CONF_PS)
545                 return;
546
547         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
548                 ieee80211_send_nullfunc(local, sdata, 1);
549
550         local->hw.conf.flags |= IEEE80211_CONF_PS;
551         ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
552 }
553
554 void ieee80211_dynamic_ps_timer(unsigned long data)
555 {
556         struct ieee80211_local *local = (void *) data;
557
558         if (local->quiescing || local->suspended)
559                 return;
560
561         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
562 }
563
564 /* MLME */
565 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
566                                      struct ieee80211_if_managed *ifmgd,
567                                      u8 *wmm_param, size_t wmm_param_len)
568 {
569         struct ieee80211_tx_queue_params params;
570         size_t left;
571         int count;
572         u8 *pos, uapsd_queues = 0;
573
574         if (local->hw.queues < 4)
575                 return;
576
577         if (!wmm_param)
578                 return;
579
580         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
581                 return;
582
583         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
584                 uapsd_queues = local->uapsd_queues;
585
586         count = wmm_param[6] & 0x0f;
587         if (count == ifmgd->wmm_last_param_set)
588                 return;
589         ifmgd->wmm_last_param_set = count;
590
591         pos = wmm_param + 8;
592         left = wmm_param_len - 8;
593
594         memset(&params, 0, sizeof(params));
595
596         local->wmm_acm = 0;
597         for (; left >= 4; left -= 4, pos += 4) {
598                 int aci = (pos[0] >> 5) & 0x03;
599                 int acm = (pos[0] >> 4) & 0x01;
600                 bool uapsd = false;
601                 int queue;
602
603                 switch (aci) {
604                 case 1: /* AC_BK */
605                         queue = 3;
606                         if (acm)
607                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
608                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
609                                 uapsd = true;
610                         break;
611                 case 2: /* AC_VI */
612                         queue = 1;
613                         if (acm)
614                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
615                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
616                                 uapsd = true;
617                         break;
618                 case 3: /* AC_VO */
619                         queue = 0;
620                         if (acm)
621                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
622                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
623                                 uapsd = true;
624                         break;
625                 case 0: /* AC_BE */
626                 default:
627                         queue = 2;
628                         if (acm)
629                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
630                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
631                                 uapsd = true;
632                         break;
633                 }
634
635                 params.aifs = pos[0] & 0x0f;
636                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
637                 params.cw_min = ecw2cw(pos[1] & 0x0f);
638                 params.txop = get_unaligned_le16(pos + 2);
639                 params.uapsd = uapsd;
640
641 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
642                 printk(KERN_DEBUG "%s: WMM queue=%d aci=%d acm=%d aifs=%d "
643                        "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
644                        wiphy_name(local->hw.wiphy), queue, aci, acm,
645                        params.aifs, params.cw_min, params.cw_max, params.txop,
646                        params.uapsd);
647 #endif
648                 if (drv_conf_tx(local, queue, &params) && local->ops->conf_tx)
649                         printk(KERN_DEBUG "%s: failed to set TX queue "
650                                "parameters for queue %d\n",
651                                wiphy_name(local->hw.wiphy), queue);
652         }
653 }
654
655 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
656                                            u16 capab, bool erp_valid, u8 erp)
657 {
658         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
659         u32 changed = 0;
660         bool use_protection;
661         bool use_short_preamble;
662         bool use_short_slot;
663
664         if (erp_valid) {
665                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
666                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
667         } else {
668                 use_protection = false;
669                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
670         }
671
672         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
673         if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
674                 use_short_slot = true;
675
676         if (use_protection != bss_conf->use_cts_prot) {
677                 bss_conf->use_cts_prot = use_protection;
678                 changed |= BSS_CHANGED_ERP_CTS_PROT;
679         }
680
681         if (use_short_preamble != bss_conf->use_short_preamble) {
682                 bss_conf->use_short_preamble = use_short_preamble;
683                 changed |= BSS_CHANGED_ERP_PREAMBLE;
684         }
685
686         if (use_short_slot != bss_conf->use_short_slot) {
687                 bss_conf->use_short_slot = use_short_slot;
688                 changed |= BSS_CHANGED_ERP_SLOT;
689         }
690
691         return changed;
692 }
693
694 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
695                                      struct cfg80211_bss *cbss,
696                                      u32 bss_info_changed)
697 {
698         struct ieee80211_bss *bss = (void *)cbss->priv;
699         struct ieee80211_local *local = sdata->local;
700
701         bss_info_changed |= BSS_CHANGED_ASSOC;
702         /* set timing information */
703         sdata->vif.bss_conf.beacon_int = cbss->beacon_interval;
704         sdata->vif.bss_conf.timestamp = cbss->tsf;
705         sdata->vif.bss_conf.dtim_period = bss->dtim_period;
706
707         bss_info_changed |= BSS_CHANGED_BEACON_INT;
708         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
709                 cbss->capability, bss->has_erp_value, bss->erp_value);
710
711         sdata->u.mgd.associated = cbss;
712         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
713
714         /* just to be sure */
715         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
716                                 IEEE80211_STA_BEACON_POLL);
717
718         /*
719          * Always handle WMM once after association regardless
720          * of the first value the AP uses. Setting -1 here has
721          * that effect because the AP values is an unsigned
722          * 4-bit value.
723          */
724         sdata->u.mgd.wmm_last_param_set = -1;
725
726         ieee80211_led_assoc(local, 1);
727
728         sdata->vif.bss_conf.assoc = 1;
729         /*
730          * For now just always ask the driver to update the basic rateset
731          * when we have associated, we aren't checking whether it actually
732          * changed or not.
733          */
734         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
735
736         /* And the BSSID changed - we're associated now */
737         bss_info_changed |= BSS_CHANGED_BSSID;
738
739         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
740
741         mutex_lock(&local->iflist_mtx);
742         ieee80211_recalc_ps(local, -1);
743         ieee80211_recalc_smps(local, sdata);
744         mutex_unlock(&local->iflist_mtx);
745
746         netif_tx_start_all_queues(sdata->dev);
747         netif_carrier_on(sdata->dev);
748 }
749
750 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata)
751 {
752         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
753         struct ieee80211_local *local = sdata->local;
754         struct sta_info *sta;
755         u32 changed = 0, config_changed = 0;
756         u8 bssid[ETH_ALEN];
757
758         ASSERT_MGD_MTX(ifmgd);
759
760         if (WARN_ON(!ifmgd->associated))
761                 return;
762
763         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
764
765         ifmgd->associated = NULL;
766         memset(ifmgd->bssid, 0, ETH_ALEN);
767
768         /*
769          * we need to commit the associated = NULL change because the
770          * scan code uses that to determine whether this iface should
771          * go to/wake up from powersave or not -- and could otherwise
772          * wake the queues erroneously.
773          */
774         smp_mb();
775
776         /*
777          * Thus, we can only afterwards stop the queues -- to account
778          * for the case where another CPU is finishing a scan at this
779          * time -- we don't want the scan code to enable queues.
780          */
781
782         netif_tx_stop_all_queues(sdata->dev);
783         netif_carrier_off(sdata->dev);
784
785         rcu_read_lock();
786         sta = sta_info_get(sdata, bssid);
787         if (sta)
788                 ieee80211_sta_tear_down_BA_sessions(sta);
789         rcu_read_unlock();
790
791         changed |= ieee80211_reset_erp_info(sdata);
792
793         ieee80211_led_assoc(local, 0);
794         changed |= BSS_CHANGED_ASSOC;
795         sdata->vif.bss_conf.assoc = false;
796
797         ieee80211_set_wmm_default(sdata);
798
799         /* channel(_type) changes are handled by ieee80211_hw_config */
800         local->oper_channel_type = NL80211_CHAN_NO_HT;
801
802         /* on the next assoc, re-program HT parameters */
803         sdata->ht_opmode_valid = false;
804
805         local->power_constr_level = 0;
806
807         del_timer_sync(&local->dynamic_ps_timer);
808         cancel_work_sync(&local->dynamic_ps_enable_work);
809
810         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
811                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
812                 config_changed |= IEEE80211_CONF_CHANGE_PS;
813         }
814
815         ieee80211_hw_config(local, config_changed);
816
817         /* And the BSSID changed -- not very interesting here */
818         changed |= BSS_CHANGED_BSSID;
819         ieee80211_bss_info_change_notify(sdata, changed);
820
821         rcu_read_lock();
822
823         sta = sta_info_get(sdata, bssid);
824         if (!sta) {
825                 rcu_read_unlock();
826                 return;
827         }
828
829         sta_info_unlink(&sta);
830
831         rcu_read_unlock();
832
833         sta_info_destroy(sta);
834 }
835
836 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
837                              struct ieee80211_hdr *hdr)
838 {
839         /*
840          * We can postpone the mgd.timer whenever receiving unicast frames
841          * from AP because we know that the connection is working both ways
842          * at that time. But multicast frames (and hence also beacons) must
843          * be ignored here, because we need to trigger the timer during
844          * data idle periods for sending the periodic probe request to the
845          * AP we're connected to.
846          */
847         if (is_multicast_ether_addr(hdr->addr1))
848                 return;
849
850         mod_timer(&sdata->u.mgd.conn_mon_timer,
851                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
852 }
853
854 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
855 {
856         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
857         const u8 *ssid;
858
859         ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
860         ieee80211_send_probe_req(sdata, ifmgd->associated->bssid,
861                                  ssid + 2, ssid[1], NULL, 0);
862
863         ifmgd->probe_send_count++;
864         ifmgd->probe_timeout = jiffies + IEEE80211_PROBE_WAIT;
865         run_again(ifmgd, ifmgd->probe_timeout);
866 }
867
868 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
869                                    bool beacon)
870 {
871         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
872         bool already = false;
873
874         if (!ieee80211_sdata_running(sdata))
875                 return;
876
877         if (sdata->local->scanning)
878                 return;
879
880         if (sdata->local->tmp_channel)
881                 return;
882
883         mutex_lock(&ifmgd->mtx);
884
885         if (!ifmgd->associated)
886                 goto out;
887
888 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
889         if (beacon && net_ratelimit())
890                 printk(KERN_DEBUG "%s: detected beacon loss from AP "
891                        "- sending probe request\n", sdata->name);
892 #endif
893
894         /*
895          * The driver/our work has already reported this event or the
896          * connection monitoring has kicked in and we have already sent
897          * a probe request. Or maybe the AP died and the driver keeps
898          * reporting until we disassociate...
899          *
900          * In either case we have to ignore the current call to this
901          * function (except for setting the correct probe reason bit)
902          * because otherwise we would reset the timer every time and
903          * never check whether we received a probe response!
904          */
905         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
906                             IEEE80211_STA_CONNECTION_POLL))
907                 already = true;
908
909         if (beacon)
910                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
911         else
912                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
913
914         if (already)
915                 goto out;
916
917         mutex_lock(&sdata->local->iflist_mtx);
918         ieee80211_recalc_ps(sdata->local, -1);
919         mutex_unlock(&sdata->local->iflist_mtx);
920
921         ifmgd->probe_send_count = 0;
922         ieee80211_mgd_probe_ap_send(sdata);
923  out:
924         mutex_unlock(&ifmgd->mtx);
925 }
926
927 void ieee80211_beacon_loss_work(struct work_struct *work)
928 {
929         struct ieee80211_sub_if_data *sdata =
930                 container_of(work, struct ieee80211_sub_if_data,
931                              u.mgd.beacon_loss_work);
932
933         ieee80211_mgd_probe_ap(sdata, true);
934 }
935
936 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
937 {
938         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
939
940         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work);
941 }
942 EXPORT_SYMBOL(ieee80211_beacon_loss);
943
944 static enum rx_mgmt_action __must_check
945 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
946                          struct ieee80211_mgmt *mgmt, size_t len)
947 {
948         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
949         const u8 *bssid = NULL;
950         u16 reason_code;
951
952         if (len < 24 + 2)
953                 return RX_MGMT_NONE;
954
955         ASSERT_MGD_MTX(ifmgd);
956
957         bssid = ifmgd->associated->bssid;
958
959         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
960
961         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
962                         sdata->name, bssid, reason_code);
963
964         ieee80211_set_disassoc(sdata);
965         ieee80211_recalc_idle(sdata->local);
966
967         return RX_MGMT_CFG80211_DEAUTH;
968 }
969
970
971 static enum rx_mgmt_action __must_check
972 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
973                            struct ieee80211_mgmt *mgmt, size_t len)
974 {
975         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
976         u16 reason_code;
977
978         if (len < 24 + 2)
979                 return RX_MGMT_NONE;
980
981         ASSERT_MGD_MTX(ifmgd);
982
983         if (WARN_ON(!ifmgd->associated))
984                 return RX_MGMT_NONE;
985
986         if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
987                 return RX_MGMT_NONE;
988
989         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
990
991         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
992                         sdata->name, mgmt->sa, reason_code);
993
994         ieee80211_set_disassoc(sdata);
995         ieee80211_recalc_idle(sdata->local);
996         return RX_MGMT_CFG80211_DISASSOC;
997 }
998
999
1000 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1001                                     struct ieee80211_mgmt *mgmt, size_t len)
1002 {
1003         struct ieee80211_sub_if_data *sdata = wk->sdata;
1004         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1005         struct ieee80211_local *local = sdata->local;
1006         struct ieee80211_supported_band *sband;
1007         struct sta_info *sta;
1008         struct cfg80211_bss *cbss = wk->assoc.bss;
1009         u8 *pos;
1010         u32 rates, basic_rates;
1011         u16 capab_info, aid;
1012         struct ieee802_11_elems elems;
1013         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1014         u32 changed = 0;
1015         int i, j, err;
1016         bool have_higher_than_11mbit = false;
1017         u16 ap_ht_cap_flags;
1018
1019         /* AssocResp and ReassocResp have identical structure */
1020
1021         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1022         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1023
1024         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1025                 printk(KERN_DEBUG "%s: invalid aid value %d; bits 15:14 not "
1026                        "set\n", sdata->name, aid);
1027         aid &= ~(BIT(15) | BIT(14));
1028
1029         pos = mgmt->u.assoc_resp.variable;
1030         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1031
1032         if (!elems.supp_rates) {
1033                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1034                        sdata->name);
1035                 return false;
1036         }
1037
1038         ifmgd->aid = aid;
1039
1040         sta = sta_info_alloc(sdata, cbss->bssid, GFP_KERNEL);
1041         if (!sta) {
1042                 printk(KERN_DEBUG "%s: failed to alloc STA entry for"
1043                        " the AP\n", sdata->name);
1044                 return false;
1045         }
1046
1047         set_sta_flags(sta, WLAN_STA_AUTH | WLAN_STA_ASSOC |
1048                            WLAN_STA_ASSOC_AP);
1049         if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1050                 set_sta_flags(sta, WLAN_STA_AUTHORIZED);
1051
1052         rates = 0;
1053         basic_rates = 0;
1054         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1055
1056         for (i = 0; i < elems.supp_rates_len; i++) {
1057                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1058                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1059
1060                 if (rate > 110)
1061                         have_higher_than_11mbit = true;
1062
1063                 for (j = 0; j < sband->n_bitrates; j++) {
1064                         if (sband->bitrates[j].bitrate == rate) {
1065                                 rates |= BIT(j);
1066                                 if (is_basic)
1067                                         basic_rates |= BIT(j);
1068                                 break;
1069                         }
1070                 }
1071         }
1072
1073         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1074                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1075                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1076
1077                 if (rate > 110)
1078                         have_higher_than_11mbit = true;
1079
1080                 for (j = 0; j < sband->n_bitrates; j++) {
1081                         if (sband->bitrates[j].bitrate == rate) {
1082                                 rates |= BIT(j);
1083                                 if (is_basic)
1084                                         basic_rates |= BIT(j);
1085                                 break;
1086                         }
1087                 }
1088         }
1089
1090         sta->sta.supp_rates[local->hw.conf.channel->band] = rates;
1091         sdata->vif.bss_conf.basic_rates = basic_rates;
1092
1093         /* cf. IEEE 802.11 9.2.12 */
1094         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
1095             have_higher_than_11mbit)
1096                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1097         else
1098                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1099
1100         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1101                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1102                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1103
1104         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1105
1106         rate_control_rate_init(sta);
1107
1108         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1109                 set_sta_flags(sta, WLAN_STA_MFP);
1110
1111         if (elems.wmm_param)
1112                 set_sta_flags(sta, WLAN_STA_WME);
1113
1114         err = sta_info_insert(sta);
1115         sta = NULL;
1116         if (err) {
1117                 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1118                        " the AP (error %d)\n", sdata->name, err);
1119                 return false;
1120         }
1121
1122         if (elems.wmm_param)
1123                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1124                                          elems.wmm_param_len);
1125         else
1126                 ieee80211_set_wmm_default(sdata);
1127
1128         local->oper_channel = wk->chan;
1129
1130         if (elems.ht_info_elem && elems.wmm_param &&
1131             (sdata->local->hw.queues >= 4) &&
1132             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1133                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1134                                                cbss->bssid, ap_ht_cap_flags);
1135
1136         /* set AID and assoc capability,
1137          * ieee80211_set_associated() will tell the driver */
1138         bss_conf->aid = aid;
1139         bss_conf->assoc_capability = capab_info;
1140         ieee80211_set_associated(sdata, cbss, changed);
1141
1142         /*
1143          * If we're using 4-addr mode, let the AP know that we're
1144          * doing so, so that it can create the STA VLAN on its side
1145          */
1146         if (ifmgd->use_4addr)
1147                 ieee80211_send_4addr_nullfunc(local, sdata);
1148
1149         /*
1150          * Start timer to probe the connection to the AP now.
1151          * Also start the timer that will detect beacon loss.
1152          */
1153         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1154         mod_beacon_timer(sdata);
1155
1156         return true;
1157 }
1158
1159
1160 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1161                                   struct ieee80211_mgmt *mgmt,
1162                                   size_t len,
1163                                   struct ieee80211_rx_status *rx_status,
1164                                   struct ieee802_11_elems *elems,
1165                                   bool beacon)
1166 {
1167         struct ieee80211_local *local = sdata->local;
1168         int freq;
1169         struct ieee80211_bss *bss;
1170         struct ieee80211_channel *channel;
1171
1172         if (elems->ds_params && elems->ds_params_len == 1)
1173                 freq = ieee80211_channel_to_frequency(elems->ds_params[0]);
1174         else
1175                 freq = rx_status->freq;
1176
1177         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1178
1179         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1180                 return;
1181
1182         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1183                                         channel, beacon);
1184         if (bss)
1185                 ieee80211_rx_bss_put(local, bss);
1186
1187         if (!sdata->u.mgd.associated)
1188                 return;
1189
1190         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1191             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1192                                                         ETH_ALEN) == 0)) {
1193                 struct ieee80211_channel_sw_ie *sw_elem =
1194                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1195                 ieee80211_sta_process_chanswitch(sdata, sw_elem, bss);
1196         }
1197 }
1198
1199
1200 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1201                                          struct sk_buff *skb)
1202 {
1203         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1204         struct ieee80211_if_managed *ifmgd;
1205         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1206         size_t baselen, len = skb->len;
1207         struct ieee802_11_elems elems;
1208
1209         ifmgd = &sdata->u.mgd;
1210
1211         ASSERT_MGD_MTX(ifmgd);
1212
1213         if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1214                 return; /* ignore ProbeResp to foreign address */
1215
1216         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1217         if (baselen > len)
1218                 return;
1219
1220         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1221                                 &elems);
1222
1223         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1224
1225         if (ifmgd->associated &&
1226             memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0 &&
1227             ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1228                             IEEE80211_STA_CONNECTION_POLL)) {
1229                 ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1230                                   IEEE80211_STA_BEACON_POLL);
1231                 mutex_lock(&sdata->local->iflist_mtx);
1232                 ieee80211_recalc_ps(sdata->local, -1);
1233                 mutex_unlock(&sdata->local->iflist_mtx);
1234                 /*
1235                  * We've received a probe response, but are not sure whether
1236                  * we have or will be receiving any beacons or data, so let's
1237                  * schedule the timers again, just in case.
1238                  */
1239                 mod_beacon_timer(sdata);
1240                 mod_timer(&ifmgd->conn_mon_timer,
1241                           round_jiffies_up(jiffies +
1242                                            IEEE80211_CONNECTION_IDLE_TIME));
1243         }
1244 }
1245
1246 /*
1247  * This is the canonical list of information elements we care about,
1248  * the filter code also gives us all changes to the Microsoft OUI
1249  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1250  *
1251  * We implement beacon filtering in software since that means we can
1252  * avoid processing the frame here and in cfg80211, and userspace
1253  * will not be able to tell whether the hardware supports it or not.
1254  *
1255  * XXX: This list needs to be dynamic -- userspace needs to be able to
1256  *      add items it requires. It also needs to be able to tell us to
1257  *      look out for other vendor IEs.
1258  */
1259 static const u64 care_about_ies =
1260         (1ULL << WLAN_EID_COUNTRY) |
1261         (1ULL << WLAN_EID_ERP_INFO) |
1262         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1263         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1264         (1ULL << WLAN_EID_HT_CAPABILITY) |
1265         (1ULL << WLAN_EID_HT_INFORMATION);
1266
1267 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1268                                      struct ieee80211_mgmt *mgmt,
1269                                      size_t len,
1270                                      struct ieee80211_rx_status *rx_status)
1271 {
1272         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1273         size_t baselen;
1274         struct ieee802_11_elems elems;
1275         struct ieee80211_local *local = sdata->local;
1276         u32 changed = 0;
1277         bool erp_valid, directed_tim = false;
1278         u8 erp_value = 0;
1279         u32 ncrc;
1280         u8 *bssid;
1281
1282         ASSERT_MGD_MTX(ifmgd);
1283
1284         /* Process beacon from the current BSS */
1285         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1286         if (baselen > len)
1287                 return;
1288
1289         if (rx_status->freq != local->hw.conf.channel->center_freq)
1290                 return;
1291
1292         /*
1293          * We might have received a number of frames, among them a
1294          * disassoc frame and a beacon...
1295          */
1296         if (!ifmgd->associated)
1297                 return;
1298
1299         bssid = ifmgd->associated->bssid;
1300
1301         /*
1302          * And in theory even frames from a different AP we were just
1303          * associated to a split-second ago!
1304          */
1305         if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1306                 return;
1307
1308         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1309 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1310                 if (net_ratelimit()) {
1311                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1312                                "to a received beacon\n", sdata->name);
1313                 }
1314 #endif
1315                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1316                 mutex_lock(&local->iflist_mtx);
1317                 ieee80211_recalc_ps(local, -1);
1318                 mutex_unlock(&local->iflist_mtx);
1319         }
1320
1321         /*
1322          * Push the beacon loss detection into the future since
1323          * we are processing a beacon from the AP just now.
1324          */
1325         mod_beacon_timer(sdata);
1326
1327         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1328         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1329                                           len - baselen, &elems,
1330                                           care_about_ies, ncrc);
1331
1332         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1333                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1334                                                    ifmgd->aid);
1335
1336         if (ncrc != ifmgd->beacon_crc) {
1337                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1338                                       true);
1339
1340                 ieee80211_sta_wmm_params(local, ifmgd, elems.wmm_param,
1341                                          elems.wmm_param_len);
1342         }
1343
1344         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1345                 if (directed_tim) {
1346                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1347                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1348                                 ieee80211_hw_config(local,
1349                                                     IEEE80211_CONF_CHANGE_PS);
1350                                 ieee80211_send_nullfunc(local, sdata, 0);
1351                         } else {
1352                                 local->pspolling = true;
1353
1354                                 /*
1355                                  * Here is assumed that the driver will be
1356                                  * able to send ps-poll frame and receive a
1357                                  * response even though power save mode is
1358                                  * enabled, but some drivers might require
1359                                  * to disable power save here. This needs
1360                                  * to be investigated.
1361                                  */
1362                                 ieee80211_send_pspoll(local, sdata);
1363                         }
1364                 }
1365         }
1366
1367         if (ncrc == ifmgd->beacon_crc)
1368                 return;
1369         ifmgd->beacon_crc = ncrc;
1370
1371         if (elems.erp_info && elems.erp_info_len >= 1) {
1372                 erp_valid = true;
1373                 erp_value = elems.erp_info[0];
1374         } else {
1375                 erp_valid = false;
1376         }
1377         changed |= ieee80211_handle_bss_capability(sdata,
1378                         le16_to_cpu(mgmt->u.beacon.capab_info),
1379                         erp_valid, erp_value);
1380
1381
1382         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1383             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1384                 struct sta_info *sta;
1385                 struct ieee80211_supported_band *sband;
1386                 u16 ap_ht_cap_flags;
1387
1388                 rcu_read_lock();
1389
1390                 sta = sta_info_get(sdata, bssid);
1391                 if (WARN_ON(!sta)) {
1392                         rcu_read_unlock();
1393                         return;
1394                 }
1395
1396                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1397
1398                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1399                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1400
1401                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1402
1403                 rcu_read_unlock();
1404
1405                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1406                                                bssid, ap_ht_cap_flags);
1407         }
1408
1409         /* Note: country IE parsing is done for us by cfg80211 */
1410         if (elems.country_elem) {
1411                 /* TODO: IBSS also needs this */
1412                 if (elems.pwr_constr_elem)
1413                         ieee80211_handle_pwr_constr(sdata,
1414                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1415                                 elems.pwr_constr_elem,
1416                                 elems.pwr_constr_elem_len);
1417         }
1418
1419         ieee80211_bss_info_change_notify(sdata, changed);
1420 }
1421
1422 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
1423                                           struct sk_buff *skb)
1424 {
1425         struct ieee80211_local *local = sdata->local;
1426         struct ieee80211_mgmt *mgmt;
1427         u16 fc;
1428
1429         if (skb->len < 24)
1430                 return RX_DROP_MONITOR;
1431
1432         mgmt = (struct ieee80211_mgmt *) skb->data;
1433         fc = le16_to_cpu(mgmt->frame_control);
1434
1435         switch (fc & IEEE80211_FCTL_STYPE) {
1436         case IEEE80211_STYPE_PROBE_RESP:
1437         case IEEE80211_STYPE_BEACON:
1438         case IEEE80211_STYPE_DEAUTH:
1439         case IEEE80211_STYPE_DISASSOC:
1440         case IEEE80211_STYPE_ACTION:
1441                 skb_queue_tail(&sdata->u.mgd.skb_queue, skb);
1442                 ieee80211_queue_work(&local->hw, &sdata->u.mgd.work);
1443                 return RX_QUEUED;
1444         }
1445
1446         return RX_DROP_MONITOR;
1447 }
1448
1449 static void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1450                                          struct sk_buff *skb)
1451 {
1452         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1453         struct ieee80211_rx_status *rx_status;
1454         struct ieee80211_mgmt *mgmt;
1455         enum rx_mgmt_action rma = RX_MGMT_NONE;
1456         u16 fc;
1457
1458         rx_status = (struct ieee80211_rx_status *) skb->cb;
1459         mgmt = (struct ieee80211_mgmt *) skb->data;
1460         fc = le16_to_cpu(mgmt->frame_control);
1461
1462         mutex_lock(&ifmgd->mtx);
1463
1464         if (ifmgd->associated &&
1465             memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1466                 switch (fc & IEEE80211_FCTL_STYPE) {
1467                 case IEEE80211_STYPE_BEACON:
1468                         ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
1469                                                  rx_status);
1470                         break;
1471                 case IEEE80211_STYPE_PROBE_RESP:
1472                         ieee80211_rx_mgmt_probe_resp(sdata, skb);
1473                         break;
1474                 case IEEE80211_STYPE_DEAUTH:
1475                         rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
1476                         break;
1477                 case IEEE80211_STYPE_DISASSOC:
1478                         rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
1479                         break;
1480                 case IEEE80211_STYPE_ACTION:
1481                         /* XXX: differentiate, can only happen for CSA now! */
1482                         ieee80211_sta_process_chanswitch(sdata,
1483                                         &mgmt->u.action.u.chan_switch.sw_elem,
1484                                         (void *)ifmgd->associated->priv);
1485                         break;
1486                 }
1487                 mutex_unlock(&ifmgd->mtx);
1488
1489                 switch (rma) {
1490                 case RX_MGMT_NONE:
1491                         /* no action */
1492                         break;
1493                 case RX_MGMT_CFG80211_DEAUTH:
1494                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1495                         break;
1496                 case RX_MGMT_CFG80211_DISASSOC:
1497                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
1498                         break;
1499                 default:
1500                         WARN(1, "unexpected: %d", rma);
1501                 }
1502                 goto out;
1503         }
1504
1505         mutex_unlock(&ifmgd->mtx);
1506
1507         if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
1508             (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH)
1509                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
1510
1511  out:
1512         kfree_skb(skb);
1513 }
1514
1515 static void ieee80211_sta_timer(unsigned long data)
1516 {
1517         struct ieee80211_sub_if_data *sdata =
1518                 (struct ieee80211_sub_if_data *) data;
1519         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1520         struct ieee80211_local *local = sdata->local;
1521
1522         if (local->quiescing) {
1523                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1524                 return;
1525         }
1526
1527         ieee80211_queue_work(&local->hw, &ifmgd->work);
1528 }
1529
1530 static void ieee80211_sta_work(struct work_struct *work)
1531 {
1532         struct ieee80211_sub_if_data *sdata =
1533                 container_of(work, struct ieee80211_sub_if_data, u.mgd.work);
1534         struct ieee80211_local *local = sdata->local;
1535         struct ieee80211_if_managed *ifmgd;
1536         struct sk_buff *skb;
1537
1538         if (!ieee80211_sdata_running(sdata))
1539                 return;
1540
1541         if (local->scanning)
1542                 return;
1543
1544         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1545                 return;
1546
1547         /*
1548          * ieee80211_queue_work() should have picked up most cases,
1549          * here we'll pick the the rest.
1550          */
1551         if (WARN(local->suspended, "STA MLME work scheduled while "
1552                  "going to suspend\n"))
1553                 return;
1554
1555         ifmgd = &sdata->u.mgd;
1556
1557         /* first process frames to avoid timing out while a frame is pending */
1558         while ((skb = skb_dequeue(&ifmgd->skb_queue)))
1559                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1560
1561         /* then process the rest of the work */
1562         mutex_lock(&ifmgd->mtx);
1563
1564         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1565                             IEEE80211_STA_CONNECTION_POLL) &&
1566             ifmgd->associated) {
1567                 u8 bssid[ETH_ALEN];
1568
1569                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1570                 if (time_is_after_jiffies(ifmgd->probe_timeout))
1571                         run_again(ifmgd, ifmgd->probe_timeout);
1572
1573                 else if (ifmgd->probe_send_count < IEEE80211_MAX_PROBE_TRIES) {
1574 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1575                         printk(KERN_DEBUG "No probe response from AP %pM"
1576                                 " after %dms, try %d\n", bssid,
1577                                 (1000 * IEEE80211_PROBE_WAIT)/HZ,
1578                                 ifmgd->probe_send_count);
1579 #endif
1580                         ieee80211_mgd_probe_ap_send(sdata);
1581                 } else {
1582                         /*
1583                          * We actually lost the connection ... or did we?
1584                          * Let's make sure!
1585                          */
1586                         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1587                                           IEEE80211_STA_BEACON_POLL);
1588                         printk(KERN_DEBUG "No probe response from AP %pM"
1589                                 " after %dms, disconnecting.\n",
1590                                 bssid, (1000 * IEEE80211_PROBE_WAIT)/HZ);
1591                         ieee80211_set_disassoc(sdata);
1592                         ieee80211_recalc_idle(local);
1593                         mutex_unlock(&ifmgd->mtx);
1594                         /*
1595                          * must be outside lock due to cfg80211,
1596                          * but that's not a problem.
1597                          */
1598                         ieee80211_send_deauth_disassoc(sdata, bssid,
1599                                         IEEE80211_STYPE_DEAUTH,
1600                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1601                                         NULL);
1602                         mutex_lock(&ifmgd->mtx);
1603                 }
1604         }
1605
1606         mutex_unlock(&ifmgd->mtx);
1607 }
1608
1609 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
1610 {
1611         struct ieee80211_sub_if_data *sdata =
1612                 (struct ieee80211_sub_if_data *) data;
1613         struct ieee80211_local *local = sdata->local;
1614
1615         if (local->quiescing)
1616                 return;
1617
1618         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.beacon_loss_work);
1619 }
1620
1621 static void ieee80211_sta_conn_mon_timer(unsigned long data)
1622 {
1623         struct ieee80211_sub_if_data *sdata =
1624                 (struct ieee80211_sub_if_data *) data;
1625         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1626         struct ieee80211_local *local = sdata->local;
1627
1628         if (local->quiescing)
1629                 return;
1630
1631         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
1632 }
1633
1634 static void ieee80211_sta_monitor_work(struct work_struct *work)
1635 {
1636         struct ieee80211_sub_if_data *sdata =
1637                 container_of(work, struct ieee80211_sub_if_data,
1638                              u.mgd.monitor_work);
1639
1640         ieee80211_mgd_probe_ap(sdata, false);
1641 }
1642
1643 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
1644 {
1645         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1646                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
1647                                         IEEE80211_STA_CONNECTION_POLL);
1648
1649                 /* let's probe the connection once */
1650                 ieee80211_queue_work(&sdata->local->hw,
1651                            &sdata->u.mgd.monitor_work);
1652                 /* and do all the other regular work too */
1653                 ieee80211_queue_work(&sdata->local->hw,
1654                            &sdata->u.mgd.work);
1655         }
1656 }
1657
1658 #ifdef CONFIG_PM
1659 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
1660 {
1661         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1662
1663         /*
1664          * we need to use atomic bitops for the running bits
1665          * only because both timers might fire at the same
1666          * time -- the code here is properly synchronised.
1667          */
1668
1669         cancel_work_sync(&ifmgd->work);
1670         cancel_work_sync(&ifmgd->beacon_loss_work);
1671         if (del_timer_sync(&ifmgd->timer))
1672                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
1673
1674         cancel_work_sync(&ifmgd->chswitch_work);
1675         if (del_timer_sync(&ifmgd->chswitch_timer))
1676                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
1677
1678         cancel_work_sync(&ifmgd->monitor_work);
1679         /* these will just be re-established on connection */
1680         del_timer_sync(&ifmgd->conn_mon_timer);
1681         del_timer_sync(&ifmgd->bcn_mon_timer);
1682 }
1683
1684 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
1685 {
1686         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1687
1688         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
1689                 add_timer(&ifmgd->timer);
1690         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
1691                 add_timer(&ifmgd->chswitch_timer);
1692 }
1693 #endif
1694
1695 /* interface setup */
1696 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
1697 {
1698         struct ieee80211_if_managed *ifmgd;
1699
1700         ifmgd = &sdata->u.mgd;
1701         INIT_WORK(&ifmgd->work, ieee80211_sta_work);
1702         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
1703         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
1704         INIT_WORK(&ifmgd->beacon_loss_work, ieee80211_beacon_loss_work);
1705         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
1706                     (unsigned long) sdata);
1707         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
1708                     (unsigned long) sdata);
1709         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
1710                     (unsigned long) sdata);
1711         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
1712                     (unsigned long) sdata);
1713         skb_queue_head_init(&ifmgd->skb_queue);
1714
1715         ifmgd->flags = 0;
1716
1717         mutex_init(&ifmgd->mtx);
1718
1719         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
1720                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
1721         else
1722                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
1723 }
1724
1725 /* scan finished notification */
1726 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
1727 {
1728         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
1729
1730         /* Restart STA timers */
1731         rcu_read_lock();
1732         list_for_each_entry_rcu(sdata, &local->interfaces, list)
1733                 ieee80211_restart_sta_timer(sdata);
1734         rcu_read_unlock();
1735 }
1736
1737 int ieee80211_max_network_latency(struct notifier_block *nb,
1738                                   unsigned long data, void *dummy)
1739 {
1740         s32 latency_usec = (s32) data;
1741         struct ieee80211_local *local =
1742                 container_of(nb, struct ieee80211_local,
1743                              network_latency_notifier);
1744
1745         mutex_lock(&local->iflist_mtx);
1746         ieee80211_recalc_ps(local, latency_usec);
1747         mutex_unlock(&local->iflist_mtx);
1748
1749         return 0;
1750 }
1751
1752 /* config hooks */
1753 static enum work_done_result
1754 ieee80211_probe_auth_done(struct ieee80211_work *wk,
1755                           struct sk_buff *skb)
1756 {
1757         if (!skb) {
1758                 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
1759                 return WORK_DONE_DESTROY;
1760         }
1761
1762         if (wk->type == IEEE80211_WORK_AUTH) {
1763                 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
1764                 return WORK_DONE_DESTROY;
1765         }
1766
1767         mutex_lock(&wk->sdata->u.mgd.mtx);
1768         ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
1769         mutex_unlock(&wk->sdata->u.mgd.mtx);
1770
1771         wk->type = IEEE80211_WORK_AUTH;
1772         wk->probe_auth.tries = 0;
1773         return WORK_DONE_REQUEUE;
1774 }
1775
1776 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
1777                        struct cfg80211_auth_request *req)
1778 {
1779         const u8 *ssid;
1780         struct ieee80211_work *wk;
1781         u16 auth_alg;
1782
1783         switch (req->auth_type) {
1784         case NL80211_AUTHTYPE_OPEN_SYSTEM:
1785                 auth_alg = WLAN_AUTH_OPEN;
1786                 break;
1787         case NL80211_AUTHTYPE_SHARED_KEY:
1788                 auth_alg = WLAN_AUTH_SHARED_KEY;
1789                 break;
1790         case NL80211_AUTHTYPE_FT:
1791                 auth_alg = WLAN_AUTH_FT;
1792                 break;
1793         case NL80211_AUTHTYPE_NETWORK_EAP:
1794                 auth_alg = WLAN_AUTH_LEAP;
1795                 break;
1796         default:
1797                 return -EOPNOTSUPP;
1798         }
1799
1800         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
1801         if (!wk)
1802                 return -ENOMEM;
1803
1804         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
1805
1806         if (req->ie && req->ie_len) {
1807                 memcpy(wk->ie, req->ie, req->ie_len);
1808                 wk->ie_len = req->ie_len;
1809         }
1810
1811         if (req->key && req->key_len) {
1812                 wk->probe_auth.key_len = req->key_len;
1813                 wk->probe_auth.key_idx = req->key_idx;
1814                 memcpy(wk->probe_auth.key, req->key, req->key_len);
1815         }
1816
1817         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
1818         memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
1819         wk->probe_auth.ssid_len = ssid[1];
1820
1821         wk->probe_auth.algorithm = auth_alg;
1822         wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
1823
1824         wk->type = IEEE80211_WORK_DIRECT_PROBE;
1825         wk->chan = req->bss->channel;
1826         wk->sdata = sdata;
1827         wk->done = ieee80211_probe_auth_done;
1828
1829         ieee80211_add_work(wk);
1830         return 0;
1831 }
1832
1833 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
1834                                                   struct sk_buff *skb)
1835 {
1836         struct ieee80211_mgmt *mgmt;
1837         u16 status;
1838
1839         if (!skb) {
1840                 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
1841                 return WORK_DONE_DESTROY;
1842         }
1843
1844         mgmt = (void *)skb->data;
1845         status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
1846
1847         if (status == WLAN_STATUS_SUCCESS) {
1848                 mutex_lock(&wk->sdata->u.mgd.mtx);
1849                 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
1850                         mutex_unlock(&wk->sdata->u.mgd.mtx);
1851                         /* oops -- internal error -- send timeout for now */
1852                         cfg80211_send_assoc_timeout(wk->sdata->dev,
1853                                                     wk->filter_ta);
1854                         return WORK_DONE_DESTROY;
1855                 }
1856                 mutex_unlock(&wk->sdata->u.mgd.mtx);
1857         }
1858
1859         cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
1860         return WORK_DONE_DESTROY;
1861 }
1862
1863 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
1864                         struct cfg80211_assoc_request *req)
1865 {
1866         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1867         struct ieee80211_bss *bss = (void *)req->bss->priv;
1868         struct ieee80211_work *wk;
1869         const u8 *ssid;
1870         int i;
1871
1872         mutex_lock(&ifmgd->mtx);
1873         if (ifmgd->associated) {
1874                 mutex_unlock(&ifmgd->mtx);
1875                 return -EALREADY;
1876         }
1877         mutex_unlock(&ifmgd->mtx);
1878
1879         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
1880         if (!wk)
1881                 return -ENOMEM;
1882
1883         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
1884
1885         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
1886                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
1887                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
1888                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
1889                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
1890
1891
1892         if (req->ie && req->ie_len) {
1893                 memcpy(wk->ie, req->ie, req->ie_len);
1894                 wk->ie_len = req->ie_len;
1895         } else
1896                 wk->ie_len = 0;
1897
1898         wk->assoc.bss = req->bss;
1899
1900         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
1901
1902         /* new association always uses requested smps mode */
1903         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
1904                 if (ifmgd->powersave)
1905                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
1906                 else
1907                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
1908         } else
1909                 ifmgd->ap_smps = ifmgd->req_smps;
1910
1911         wk->assoc.smps = ifmgd->ap_smps;
1912         /*
1913          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
1914          * We still associate in non-HT mode (11a/b/g) if any one of these
1915          * ciphers is configured as pairwise.
1916          * We can set this to true for non-11n hardware, that'll be checked
1917          * separately along with the peer capabilities.
1918          */
1919         wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
1920         wk->assoc.capability = req->bss->capability;
1921         wk->assoc.wmm_used = bss->wmm_used;
1922         wk->assoc.supp_rates = bss->supp_rates;
1923         wk->assoc.supp_rates_len = bss->supp_rates_len;
1924         wk->assoc.ht_information_ie =
1925                 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
1926
1927         if (bss->wmm_used && bss->uapsd_supported &&
1928             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
1929                 wk->assoc.uapsd_used = true;
1930                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
1931         } else {
1932                 wk->assoc.uapsd_used = false;
1933                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
1934         }
1935
1936         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
1937         memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
1938         wk->assoc.ssid_len = ssid[1];
1939
1940         if (req->prev_bssid)
1941                 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
1942
1943         wk->type = IEEE80211_WORK_ASSOC;
1944         wk->chan = req->bss->channel;
1945         wk->sdata = sdata;
1946         wk->done = ieee80211_assoc_done;
1947
1948         if (req->use_mfp) {
1949                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
1950                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
1951         } else {
1952                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
1953                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
1954         }
1955
1956         if (req->crypto.control_port)
1957                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
1958         else
1959                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
1960
1961         ieee80211_add_work(wk);
1962         return 0;
1963 }
1964
1965 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
1966                          struct cfg80211_deauth_request *req,
1967                          void *cookie)
1968 {
1969         struct ieee80211_local *local = sdata->local;
1970         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1971         struct ieee80211_work *wk;
1972         const u8 *bssid = req->bss->bssid;
1973
1974         mutex_lock(&ifmgd->mtx);
1975
1976         if (ifmgd->associated == req->bss) {
1977                 bssid = req->bss->bssid;
1978                 ieee80211_set_disassoc(sdata);
1979                 mutex_unlock(&ifmgd->mtx);
1980         } else {
1981                 bool not_auth_yet = false;
1982
1983                 mutex_unlock(&ifmgd->mtx);
1984
1985                 mutex_lock(&local->work_mtx);
1986                 list_for_each_entry(wk, &local->work_list, list) {
1987                         if (wk->type != IEEE80211_WORK_DIRECT_PROBE)
1988                                 continue;
1989                         if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
1990                                 continue;
1991                         not_auth_yet = true;
1992                         list_del(&wk->list);
1993                         free_work(wk);
1994                         break;
1995                 }
1996                 mutex_unlock(&local->work_mtx);
1997
1998                 /*
1999                  * If somebody requests authentication and we haven't
2000                  * sent out an auth frame yet there's no need to send
2001                  * out a deauth frame either. If the state was PROBE,
2002                  * then this is the case. If it's AUTH we have sent a
2003                  * frame, and if it's IDLE we have completed the auth
2004                  * process already.
2005                  */
2006                 if (not_auth_yet) {
2007                         __cfg80211_auth_canceled(sdata->dev, bssid);
2008                         return 0;
2009                 }
2010         }
2011
2012         printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2013                sdata->name, bssid, req->reason_code);
2014
2015         ieee80211_send_deauth_disassoc(sdata, bssid,
2016                         IEEE80211_STYPE_DEAUTH, req->reason_code,
2017                         cookie);
2018
2019         ieee80211_recalc_idle(sdata->local);
2020
2021         return 0;
2022 }
2023
2024 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2025                            struct cfg80211_disassoc_request *req,
2026                            void *cookie)
2027 {
2028         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2029
2030         mutex_lock(&ifmgd->mtx);
2031
2032         /*
2033          * cfg80211 should catch this ... but it's racy since
2034          * we can receive a disassoc frame, process it, hand it
2035          * to cfg80211 while that's in a locked section already
2036          * trying to tell us that the user wants to disconnect.
2037          */
2038         if (ifmgd->associated != req->bss) {
2039                 mutex_unlock(&ifmgd->mtx);
2040                 return -ENOLINK;
2041         }
2042
2043         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2044                sdata->name, req->bss->bssid, req->reason_code);
2045
2046         ieee80211_set_disassoc(sdata);
2047
2048         mutex_unlock(&ifmgd->mtx);
2049
2050         ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2051                         IEEE80211_STYPE_DISASSOC, req->reason_code,
2052                         cookie);
2053
2054         ieee80211_recalc_idle(sdata->local);
2055
2056         return 0;
2057 }