Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
[~shefty/rdma-dev.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/moduleparam.h>
20 #include <linux/rtnetlink.h>
21 #include <linux/pm_qos.h>
22 #include <linux/crc32.h>
23 #include <linux/slab.h>
24 #include <linux/export.h>
25 #include <net/mac80211.h>
26 #include <asm/unaligned.h>
27
28 #include "ieee80211_i.h"
29 #include "driver-ops.h"
30 #include "rate.h"
31 #include "led.h"
32
33 static int max_nullfunc_tries = 2;
34 module_param(max_nullfunc_tries, int, 0644);
35 MODULE_PARM_DESC(max_nullfunc_tries,
36                  "Maximum nullfunc tx tries before disconnecting (reason 4).");
37
38 static int max_probe_tries = 5;
39 module_param(max_probe_tries, int, 0644);
40 MODULE_PARM_DESC(max_probe_tries,
41                  "Maximum probe tries before disconnecting (reason 4).");
42
43 /*
44  * Beacon loss timeout is calculated as N frames times the
45  * advertised beacon interval.  This may need to be somewhat
46  * higher than what hardware might detect to account for
47  * delays in the host processing frames. But since we also
48  * probe on beacon miss before declaring the connection lost
49  * default to what we want.
50  */
51 #define IEEE80211_BEACON_LOSS_COUNT     7
52
53 /*
54  * Time the connection can be idle before we probe
55  * it to see if we can still talk to the AP.
56  */
57 #define IEEE80211_CONNECTION_IDLE_TIME  (30 * HZ)
58 /*
59  * Time we wait for a probe response after sending
60  * a probe request because of beacon loss or for
61  * checking the connection still works.
62  */
63 static int probe_wait_ms = 500;
64 module_param(probe_wait_ms, int, 0644);
65 MODULE_PARM_DESC(probe_wait_ms,
66                  "Maximum time(ms) to wait for probe response"
67                  " before disconnecting (reason 4).");
68
69 /*
70  * Weight given to the latest Beacon frame when calculating average signal
71  * strength for Beacon frames received in the current BSS. This must be
72  * between 1 and 15.
73  */
74 #define IEEE80211_SIGNAL_AVE_WEIGHT     3
75
76 /*
77  * How many Beacon frames need to have been used in average signal strength
78  * before starting to indicate signal change events.
79  */
80 #define IEEE80211_SIGNAL_AVE_MIN_COUNT  4
81
82 #define TMR_RUNNING_TIMER       0
83 #define TMR_RUNNING_CHANSW      1
84
85 /*
86  * All cfg80211 functions have to be called outside a locked
87  * section so that they can acquire a lock themselves... This
88  * is much simpler than queuing up things in cfg80211, but we
89  * do need some indirection for that here.
90  */
91 enum rx_mgmt_action {
92         /* no action required */
93         RX_MGMT_NONE,
94
95         /* caller must call cfg80211_send_deauth() */
96         RX_MGMT_CFG80211_DEAUTH,
97
98         /* caller must call cfg80211_send_disassoc() */
99         RX_MGMT_CFG80211_DISASSOC,
100 };
101
102 /* utils */
103 static inline void ASSERT_MGD_MTX(struct ieee80211_if_managed *ifmgd)
104 {
105         lockdep_assert_held(&ifmgd->mtx);
106 }
107
108 /*
109  * We can have multiple work items (and connection probing)
110  * scheduling this timer, but we need to take care to only
111  * reschedule it when it should fire _earlier_ than it was
112  * asked for before, or if it's not pending right now. This
113  * function ensures that. Note that it then is required to
114  * run this function for all timeouts after the first one
115  * has happened -- the work that runs from this timer will
116  * do that.
117  */
118 static void run_again(struct ieee80211_if_managed *ifmgd,
119                              unsigned long timeout)
120 {
121         ASSERT_MGD_MTX(ifmgd);
122
123         if (!timer_pending(&ifmgd->timer) ||
124             time_before(timeout, ifmgd->timer.expires))
125                 mod_timer(&ifmgd->timer, timeout);
126 }
127
128 void ieee80211_sta_reset_beacon_monitor(struct ieee80211_sub_if_data *sdata)
129 {
130         if (sdata->local->hw.flags & IEEE80211_HW_BEACON_FILTER)
131                 return;
132
133         mod_timer(&sdata->u.mgd.bcn_mon_timer,
134                   round_jiffies_up(jiffies + sdata->u.mgd.beacon_timeout));
135 }
136
137 void ieee80211_sta_reset_conn_monitor(struct ieee80211_sub_if_data *sdata)
138 {
139         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
140
141         if (unlikely(!sdata->u.mgd.associated))
142                 return;
143
144         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
145                 return;
146
147         mod_timer(&sdata->u.mgd.conn_mon_timer,
148                   round_jiffies_up(jiffies + IEEE80211_CONNECTION_IDLE_TIME));
149
150         ifmgd->probe_send_count = 0;
151 }
152
153 static int ecw2cw(int ecw)
154 {
155         return (1 << ecw) - 1;
156 }
157
158 /*
159  * ieee80211_enable_ht should be called only after the operating band
160  * has been determined as ht configuration depends on the hw's
161  * HT abilities for a specific band.
162  */
163 static u32 ieee80211_enable_ht(struct ieee80211_sub_if_data *sdata,
164                                struct ieee80211_ht_info *hti,
165                                const u8 *bssid, u16 ap_ht_cap_flags,
166                                bool beacon_htcap_ie)
167 {
168         struct ieee80211_local *local = sdata->local;
169         struct ieee80211_supported_band *sband;
170         struct sta_info *sta;
171         u32 changed = 0;
172         int hti_cfreq;
173         u16 ht_opmode;
174         bool enable_ht = true;
175         enum nl80211_channel_type prev_chantype;
176         enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
177
178         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
179
180         prev_chantype = sdata->vif.bss_conf.channel_type;
181
182         /* HT is not supported */
183         if (!sband->ht_cap.ht_supported)
184                 enable_ht = false;
185
186         if (enable_ht) {
187                 hti_cfreq = ieee80211_channel_to_frequency(hti->control_chan,
188                                                            sband->band);
189                 /* check that channel matches the right operating channel */
190                 if (local->hw.conf.channel->center_freq != hti_cfreq) {
191                         /* Some APs mess this up, evidently.
192                          * Netgear WNDR3700 sometimes reports 4 higher than
193                          * the actual channel, for instance.
194                          */
195                         printk(KERN_DEBUG
196                                "%s: Wrong control channel in association"
197                                " response: configured center-freq: %d"
198                                " hti-cfreq: %d  hti->control_chan: %d"
199                                " band: %d.  Disabling HT.\n",
200                                sdata->name,
201                                local->hw.conf.channel->center_freq,
202                                hti_cfreq, hti->control_chan,
203                                sband->band);
204                         enable_ht = false;
205                 }
206         }
207
208         if (enable_ht) {
209                 channel_type = NL80211_CHAN_HT20;
210
211                 if (!(ap_ht_cap_flags & IEEE80211_HT_CAP_40MHZ_INTOLERANT) &&
212                     (sband->ht_cap.cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) &&
213                     (hti->ht_param & IEEE80211_HT_PARAM_CHAN_WIDTH_ANY)) {
214                         switch(hti->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
215                         case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
216                                 if (!(local->hw.conf.channel->flags &
217                                     IEEE80211_CHAN_NO_HT40PLUS))
218                                         channel_type = NL80211_CHAN_HT40PLUS;
219                                 break;
220                         case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
221                                 if (!(local->hw.conf.channel->flags &
222                                     IEEE80211_CHAN_NO_HT40MINUS))
223                                         channel_type = NL80211_CHAN_HT40MINUS;
224                                 break;
225                         }
226                 }
227         }
228
229         if (local->tmp_channel)
230                 local->tmp_channel_type = channel_type;
231
232         if (!ieee80211_set_channel_type(local, sdata, channel_type)) {
233                 /* can only fail due to HT40+/- mismatch */
234                 channel_type = NL80211_CHAN_HT20;
235                 WARN_ON(!ieee80211_set_channel_type(local, sdata, channel_type));
236         }
237
238         if (beacon_htcap_ie && (prev_chantype != channel_type)) {
239                 /*
240                  * Whenever the AP announces the HT mode change that can be
241                  * 40MHz intolerant or etc., it would be safer to stop tx
242                  * queues before doing hw config to avoid buffer overflow.
243                  */
244                 ieee80211_stop_queues_by_reason(&sdata->local->hw,
245                                 IEEE80211_QUEUE_STOP_REASON_CHTYPE_CHANGE);
246
247                 /* flush out all packets */
248                 synchronize_net();
249
250                 drv_flush(local, false);
251         }
252
253         /* channel_type change automatically detected */
254         ieee80211_hw_config(local, 0);
255
256         if (prev_chantype != channel_type) {
257                 rcu_read_lock();
258                 sta = sta_info_get(sdata, bssid);
259                 if (sta)
260                         rate_control_rate_update(local, sband, sta,
261                                                  IEEE80211_RC_HT_CHANGED,
262                                                  channel_type);
263                 rcu_read_unlock();
264
265                 if (beacon_htcap_ie)
266                         ieee80211_wake_queues_by_reason(&sdata->local->hw,
267                                 IEEE80211_QUEUE_STOP_REASON_CHTYPE_CHANGE);
268         }
269
270         ht_opmode = le16_to_cpu(hti->operation_mode);
271
272         /* if bss configuration changed store the new one */
273         if (sdata->ht_opmode_valid != enable_ht ||
274             sdata->vif.bss_conf.ht_operation_mode != ht_opmode ||
275             prev_chantype != channel_type) {
276                 changed |= BSS_CHANGED_HT;
277                 sdata->vif.bss_conf.ht_operation_mode = ht_opmode;
278                 sdata->ht_opmode_valid = enable_ht;
279         }
280
281         return changed;
282 }
283
284 /* frame sending functions */
285
286 static void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
287                                            const u8 *bssid, u16 stype, u16 reason,
288                                            void *cookie, bool send_frame)
289 {
290         struct ieee80211_local *local = sdata->local;
291         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
292         struct sk_buff *skb;
293         struct ieee80211_mgmt *mgmt;
294
295         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt));
296         if (!skb)
297                 return;
298
299         skb_reserve(skb, local->hw.extra_tx_headroom);
300
301         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
302         memset(mgmt, 0, 24);
303         memcpy(mgmt->da, bssid, ETH_ALEN);
304         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
305         memcpy(mgmt->bssid, bssid, ETH_ALEN);
306         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
307         skb_put(skb, 2);
308         /* u.deauth.reason_code == u.disassoc.reason_code */
309         mgmt->u.deauth.reason_code = cpu_to_le16(reason);
310
311         if (stype == IEEE80211_STYPE_DEAUTH)
312                 if (cookie)
313                         __cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
314                 else
315                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
316         else
317                 if (cookie)
318                         __cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
319                 else
320                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
321         if (!(ifmgd->flags & IEEE80211_STA_MFP_ENABLED))
322                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
323
324         if (send_frame)
325                 ieee80211_tx_skb(sdata, skb);
326         else
327                 kfree_skb(skb);
328 }
329
330 void ieee80211_send_pspoll(struct ieee80211_local *local,
331                            struct ieee80211_sub_if_data *sdata)
332 {
333         struct ieee80211_pspoll *pspoll;
334         struct sk_buff *skb;
335
336         skb = ieee80211_pspoll_get(&local->hw, &sdata->vif);
337         if (!skb)
338                 return;
339
340         pspoll = (struct ieee80211_pspoll *) skb->data;
341         pspoll->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
342
343         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
344         ieee80211_tx_skb(sdata, skb);
345 }
346
347 void ieee80211_send_nullfunc(struct ieee80211_local *local,
348                              struct ieee80211_sub_if_data *sdata,
349                              int powersave)
350 {
351         struct sk_buff *skb;
352         struct ieee80211_hdr_3addr *nullfunc;
353         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
354
355         skb = ieee80211_nullfunc_get(&local->hw, &sdata->vif);
356         if (!skb)
357                 return;
358
359         nullfunc = (struct ieee80211_hdr_3addr *) skb->data;
360         if (powersave)
361                 nullfunc->frame_control |= cpu_to_le16(IEEE80211_FCTL_PM);
362
363         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
364         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
365                             IEEE80211_STA_CONNECTION_POLL))
366                 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_USE_MINRATE;
367
368         ieee80211_tx_skb(sdata, skb);
369 }
370
371 static void ieee80211_send_4addr_nullfunc(struct ieee80211_local *local,
372                                           struct ieee80211_sub_if_data *sdata)
373 {
374         struct sk_buff *skb;
375         struct ieee80211_hdr *nullfunc;
376         __le16 fc;
377
378         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
379                 return;
380
381         skb = dev_alloc_skb(local->hw.extra_tx_headroom + 30);
382         if (!skb)
383                 return;
384
385         skb_reserve(skb, local->hw.extra_tx_headroom);
386
387         nullfunc = (struct ieee80211_hdr *) skb_put(skb, 30);
388         memset(nullfunc, 0, 30);
389         fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_NULLFUNC |
390                          IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
391         nullfunc->frame_control = fc;
392         memcpy(nullfunc->addr1, sdata->u.mgd.bssid, ETH_ALEN);
393         memcpy(nullfunc->addr2, sdata->vif.addr, ETH_ALEN);
394         memcpy(nullfunc->addr3, sdata->u.mgd.bssid, ETH_ALEN);
395         memcpy(nullfunc->addr4, sdata->vif.addr, ETH_ALEN);
396
397         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
398         ieee80211_tx_skb(sdata, skb);
399 }
400
401 /* spectrum management related things */
402 static void ieee80211_chswitch_work(struct work_struct *work)
403 {
404         struct ieee80211_sub_if_data *sdata =
405                 container_of(work, struct ieee80211_sub_if_data, u.mgd.chswitch_work);
406         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
407
408         if (!ieee80211_sdata_running(sdata))
409                 return;
410
411         mutex_lock(&ifmgd->mtx);
412         if (!ifmgd->associated)
413                 goto out;
414
415         sdata->local->oper_channel = sdata->local->csa_channel;
416         if (!sdata->local->ops->channel_switch) {
417                 /* call "hw_config" only if doing sw channel switch */
418                 ieee80211_hw_config(sdata->local,
419                         IEEE80211_CONF_CHANGE_CHANNEL);
420         } else {
421                 /* update the device channel directly */
422                 sdata->local->hw.conf.channel = sdata->local->oper_channel;
423         }
424
425         /* XXX: shouldn't really modify cfg80211-owned data! */
426         ifmgd->associated->channel = sdata->local->oper_channel;
427
428         ieee80211_wake_queues_by_reason(&sdata->local->hw,
429                                         IEEE80211_QUEUE_STOP_REASON_CSA);
430  out:
431         ifmgd->flags &= ~IEEE80211_STA_CSA_RECEIVED;
432         mutex_unlock(&ifmgd->mtx);
433 }
434
435 void ieee80211_chswitch_done(struct ieee80211_vif *vif, bool success)
436 {
437         struct ieee80211_sub_if_data *sdata;
438         struct ieee80211_if_managed *ifmgd;
439
440         sdata = vif_to_sdata(vif);
441         ifmgd = &sdata->u.mgd;
442
443         trace_api_chswitch_done(sdata, success);
444         if (!success) {
445                 /*
446                  * If the channel switch was not successful, stay
447                  * around on the old channel. We currently lack
448                  * good handling of this situation, possibly we
449                  * should just drop the association.
450                  */
451                 sdata->local->csa_channel = sdata->local->oper_channel;
452         }
453
454         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
455 }
456 EXPORT_SYMBOL(ieee80211_chswitch_done);
457
458 static void ieee80211_chswitch_timer(unsigned long data)
459 {
460         struct ieee80211_sub_if_data *sdata =
461                 (struct ieee80211_sub_if_data *) data;
462         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
463
464         if (sdata->local->quiescing) {
465                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
466                 return;
467         }
468
469         ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
470 }
471
472 void ieee80211_sta_process_chanswitch(struct ieee80211_sub_if_data *sdata,
473                                       struct ieee80211_channel_sw_ie *sw_elem,
474                                       struct ieee80211_bss *bss,
475                                       u64 timestamp)
476 {
477         struct cfg80211_bss *cbss =
478                 container_of((void *)bss, struct cfg80211_bss, priv);
479         struct ieee80211_channel *new_ch;
480         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
481         int new_freq = ieee80211_channel_to_frequency(sw_elem->new_ch_num,
482                                                       cbss->channel->band);
483
484         ASSERT_MGD_MTX(ifmgd);
485
486         if (!ifmgd->associated)
487                 return;
488
489         if (sdata->local->scanning)
490                 return;
491
492         /* Disregard subsequent beacons if we are already running a timer
493            processing a CSA */
494
495         if (ifmgd->flags & IEEE80211_STA_CSA_RECEIVED)
496                 return;
497
498         new_ch = ieee80211_get_channel(sdata->local->hw.wiphy, new_freq);
499         if (!new_ch || new_ch->flags & IEEE80211_CHAN_DISABLED)
500                 return;
501
502         sdata->local->csa_channel = new_ch;
503
504         if (sdata->local->ops->channel_switch) {
505                 /* use driver's channel switch callback */
506                 struct ieee80211_channel_switch ch_switch;
507                 memset(&ch_switch, 0, sizeof(ch_switch));
508                 ch_switch.timestamp = timestamp;
509                 if (sw_elem->mode) {
510                         ch_switch.block_tx = true;
511                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
512                                         IEEE80211_QUEUE_STOP_REASON_CSA);
513                 }
514                 ch_switch.channel = new_ch;
515                 ch_switch.count = sw_elem->count;
516                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
517                 drv_channel_switch(sdata->local, &ch_switch);
518                 return;
519         }
520
521         /* channel switch handled in software */
522         if (sw_elem->count <= 1) {
523                 ieee80211_queue_work(&sdata->local->hw, &ifmgd->chswitch_work);
524         } else {
525                 if (sw_elem->mode)
526                         ieee80211_stop_queues_by_reason(&sdata->local->hw,
527                                         IEEE80211_QUEUE_STOP_REASON_CSA);
528                 ifmgd->flags |= IEEE80211_STA_CSA_RECEIVED;
529                 mod_timer(&ifmgd->chswitch_timer,
530                           jiffies +
531                           msecs_to_jiffies(sw_elem->count *
532                                            cbss->beacon_interval));
533         }
534 }
535
536 static void ieee80211_handle_pwr_constr(struct ieee80211_sub_if_data *sdata,
537                                         u16 capab_info, u8 *pwr_constr_elem,
538                                         u8 pwr_constr_elem_len)
539 {
540         struct ieee80211_conf *conf = &sdata->local->hw.conf;
541
542         if (!(capab_info & WLAN_CAPABILITY_SPECTRUM_MGMT))
543                 return;
544
545         /* Power constraint IE length should be 1 octet */
546         if (pwr_constr_elem_len != 1)
547                 return;
548
549         if ((*pwr_constr_elem <= conf->channel->max_power) &&
550             (*pwr_constr_elem != sdata->local->power_constr_level)) {
551                 sdata->local->power_constr_level = *pwr_constr_elem;
552                 ieee80211_hw_config(sdata->local, 0);
553         }
554 }
555
556 void ieee80211_enable_dyn_ps(struct ieee80211_vif *vif)
557 {
558         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
559         struct ieee80211_local *local = sdata->local;
560         struct ieee80211_conf *conf = &local->hw.conf;
561
562         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
563                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
564                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
565
566         local->disable_dynamic_ps = false;
567         conf->dynamic_ps_timeout = local->dynamic_ps_user_timeout;
568 }
569 EXPORT_SYMBOL(ieee80211_enable_dyn_ps);
570
571 void ieee80211_disable_dyn_ps(struct ieee80211_vif *vif)
572 {
573         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
574         struct ieee80211_local *local = sdata->local;
575         struct ieee80211_conf *conf = &local->hw.conf;
576
577         WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION ||
578                 !(local->hw.flags & IEEE80211_HW_SUPPORTS_PS) ||
579                 (local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS));
580
581         local->disable_dynamic_ps = true;
582         conf->dynamic_ps_timeout = 0;
583         del_timer_sync(&local->dynamic_ps_timer);
584         ieee80211_queue_work(&local->hw,
585                              &local->dynamic_ps_enable_work);
586 }
587 EXPORT_SYMBOL(ieee80211_disable_dyn_ps);
588
589 /* powersave */
590 static void ieee80211_enable_ps(struct ieee80211_local *local,
591                                 struct ieee80211_sub_if_data *sdata)
592 {
593         struct ieee80211_conf *conf = &local->hw.conf;
594
595         /*
596          * If we are scanning right now then the parameters will
597          * take effect when scan finishes.
598          */
599         if (local->scanning)
600                 return;
601
602         if (conf->dynamic_ps_timeout > 0 &&
603             !(local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_PS)) {
604                 mod_timer(&local->dynamic_ps_timer, jiffies +
605                           msecs_to_jiffies(conf->dynamic_ps_timeout));
606         } else {
607                 if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
608                         ieee80211_send_nullfunc(local, sdata, 1);
609
610                 if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
611                     (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS))
612                         return;
613
614                 conf->flags |= IEEE80211_CONF_PS;
615                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
616         }
617 }
618
619 static void ieee80211_change_ps(struct ieee80211_local *local)
620 {
621         struct ieee80211_conf *conf = &local->hw.conf;
622
623         if (local->ps_sdata) {
624                 ieee80211_enable_ps(local, local->ps_sdata);
625         } else if (conf->flags & IEEE80211_CONF_PS) {
626                 conf->flags &= ~IEEE80211_CONF_PS;
627                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
628                 del_timer_sync(&local->dynamic_ps_timer);
629                 cancel_work_sync(&local->dynamic_ps_enable_work);
630         }
631 }
632
633 static bool ieee80211_powersave_allowed(struct ieee80211_sub_if_data *sdata)
634 {
635         struct ieee80211_if_managed *mgd = &sdata->u.mgd;
636         struct sta_info *sta = NULL;
637         bool authorized = false;
638
639         if (!mgd->powersave)
640                 return false;
641
642         if (mgd->broken_ap)
643                 return false;
644
645         if (!mgd->associated)
646                 return false;
647
648         if (!mgd->associated->beacon_ies)
649                 return false;
650
651         if (mgd->flags & (IEEE80211_STA_BEACON_POLL |
652                           IEEE80211_STA_CONNECTION_POLL))
653                 return false;
654
655         rcu_read_lock();
656         sta = sta_info_get(sdata, mgd->bssid);
657         if (sta)
658                 authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
659         rcu_read_unlock();
660
661         return authorized;
662 }
663
664 /* need to hold RTNL or interface lock */
665 void ieee80211_recalc_ps(struct ieee80211_local *local, s32 latency)
666 {
667         struct ieee80211_sub_if_data *sdata, *found = NULL;
668         int count = 0;
669         int timeout;
670
671         if (!(local->hw.flags & IEEE80211_HW_SUPPORTS_PS)) {
672                 local->ps_sdata = NULL;
673                 return;
674         }
675
676         if (!list_empty(&local->work_list)) {
677                 local->ps_sdata = NULL;
678                 goto change;
679         }
680
681         list_for_each_entry(sdata, &local->interfaces, list) {
682                 if (!ieee80211_sdata_running(sdata))
683                         continue;
684                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
685                         /* If an AP vif is found, then disable PS
686                          * by setting the count to zero thereby setting
687                          * ps_sdata to NULL.
688                          */
689                         count = 0;
690                         break;
691                 }
692                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
693                         continue;
694                 found = sdata;
695                 count++;
696         }
697
698         if (count == 1 && ieee80211_powersave_allowed(found)) {
699                 struct ieee80211_conf *conf = &local->hw.conf;
700                 s32 beaconint_us;
701
702                 if (latency < 0)
703                         latency = pm_qos_request(PM_QOS_NETWORK_LATENCY);
704
705                 beaconint_us = ieee80211_tu_to_usec(
706                                         found->vif.bss_conf.beacon_int);
707
708                 timeout = local->dynamic_ps_forced_timeout;
709                 if (timeout < 0) {
710                         /*
711                          * Go to full PSM if the user configures a very low
712                          * latency requirement.
713                          * The 2000 second value is there for compatibility
714                          * until the PM_QOS_NETWORK_LATENCY is configured
715                          * with real values.
716                          */
717                         if (latency > (1900 * USEC_PER_MSEC) &&
718                             latency != (2000 * USEC_PER_SEC))
719                                 timeout = 0;
720                         else
721                                 timeout = 100;
722                 }
723                 local->dynamic_ps_user_timeout = timeout;
724                 if (!local->disable_dynamic_ps)
725                         conf->dynamic_ps_timeout =
726                                 local->dynamic_ps_user_timeout;
727
728                 if (beaconint_us > latency) {
729                         local->ps_sdata = NULL;
730                 } else {
731                         struct ieee80211_bss *bss;
732                         int maxslp = 1;
733                         u8 dtimper;
734
735                         bss = (void *)found->u.mgd.associated->priv;
736                         dtimper = bss->dtim_period;
737
738                         /* If the TIM IE is invalid, pretend the value is 1 */
739                         if (!dtimper)
740                                 dtimper = 1;
741                         else if (dtimper > 1)
742                                 maxslp = min_t(int, dtimper,
743                                                     latency / beaconint_us);
744
745                         local->hw.conf.max_sleep_period = maxslp;
746                         local->hw.conf.ps_dtim_period = dtimper;
747                         local->ps_sdata = found;
748                 }
749         } else {
750                 local->ps_sdata = NULL;
751         }
752
753  change:
754         ieee80211_change_ps(local);
755 }
756
757 void ieee80211_dynamic_ps_disable_work(struct work_struct *work)
758 {
759         struct ieee80211_local *local =
760                 container_of(work, struct ieee80211_local,
761                              dynamic_ps_disable_work);
762
763         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
764                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
765                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
766         }
767
768         ieee80211_wake_queues_by_reason(&local->hw,
769                                         IEEE80211_QUEUE_STOP_REASON_PS);
770 }
771
772 void ieee80211_dynamic_ps_enable_work(struct work_struct *work)
773 {
774         struct ieee80211_local *local =
775                 container_of(work, struct ieee80211_local,
776                              dynamic_ps_enable_work);
777         struct ieee80211_sub_if_data *sdata = local->ps_sdata;
778         struct ieee80211_if_managed *ifmgd;
779         unsigned long flags;
780         int q;
781
782         /* can only happen when PS was just disabled anyway */
783         if (!sdata)
784                 return;
785
786         ifmgd = &sdata->u.mgd;
787
788         if (local->hw.conf.flags & IEEE80211_CONF_PS)
789                 return;
790
791         if (!local->disable_dynamic_ps &&
792             local->hw.conf.dynamic_ps_timeout > 0) {
793                 /* don't enter PS if TX frames are pending */
794                 if (drv_tx_frames_pending(local)) {
795                         mod_timer(&local->dynamic_ps_timer, jiffies +
796                                   msecs_to_jiffies(
797                                   local->hw.conf.dynamic_ps_timeout));
798                         return;
799                 }
800
801                 /*
802                  * transmission can be stopped by others which leads to
803                  * dynamic_ps_timer expiry. Postpone the ps timer if it
804                  * is not the actual idle state.
805                  */
806                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
807                 for (q = 0; q < local->hw.queues; q++) {
808                         if (local->queue_stop_reasons[q]) {
809                                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
810                                                        flags);
811                                 mod_timer(&local->dynamic_ps_timer, jiffies +
812                                           msecs_to_jiffies(
813                                           local->hw.conf.dynamic_ps_timeout));
814                                 return;
815                         }
816                 }
817                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
818         }
819
820         if ((local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) &&
821             (!(ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED))) {
822                 netif_tx_stop_all_queues(sdata->dev);
823
824                 if (drv_tx_frames_pending(local))
825                         mod_timer(&local->dynamic_ps_timer, jiffies +
826                                   msecs_to_jiffies(
827                                   local->hw.conf.dynamic_ps_timeout));
828                 else {
829                         ieee80211_send_nullfunc(local, sdata, 1);
830                         /* Flush to get the tx status of nullfunc frame */
831                         drv_flush(local, false);
832                 }
833         }
834
835         if (!((local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) &&
836               (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)) ||
837             (ifmgd->flags & IEEE80211_STA_NULLFUNC_ACKED)) {
838                 ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
839                 local->hw.conf.flags |= IEEE80211_CONF_PS;
840                 ieee80211_hw_config(local, IEEE80211_CONF_CHANGE_PS);
841         }
842
843         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
844                 netif_tx_wake_all_queues(sdata->dev);
845 }
846
847 void ieee80211_dynamic_ps_timer(unsigned long data)
848 {
849         struct ieee80211_local *local = (void *) data;
850
851         if (local->quiescing || local->suspended)
852                 return;
853
854         ieee80211_queue_work(&local->hw, &local->dynamic_ps_enable_work);
855 }
856
857 /* MLME */
858 static void ieee80211_sta_wmm_params(struct ieee80211_local *local,
859                                      struct ieee80211_sub_if_data *sdata,
860                                      u8 *wmm_param, size_t wmm_param_len)
861 {
862         struct ieee80211_tx_queue_params params;
863         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
864         size_t left;
865         int count;
866         u8 *pos, uapsd_queues = 0;
867
868         if (!local->ops->conf_tx)
869                 return;
870
871         if (local->hw.queues < 4)
872                 return;
873
874         if (!wmm_param)
875                 return;
876
877         if (wmm_param_len < 8 || wmm_param[5] /* version */ != 1)
878                 return;
879
880         if (ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED)
881                 uapsd_queues = local->uapsd_queues;
882
883         count = wmm_param[6] & 0x0f;
884         if (count == ifmgd->wmm_last_param_set)
885                 return;
886         ifmgd->wmm_last_param_set = count;
887
888         pos = wmm_param + 8;
889         left = wmm_param_len - 8;
890
891         memset(&params, 0, sizeof(params));
892
893         local->wmm_acm = 0;
894         for (; left >= 4; left -= 4, pos += 4) {
895                 int aci = (pos[0] >> 5) & 0x03;
896                 int acm = (pos[0] >> 4) & 0x01;
897                 bool uapsd = false;
898                 int queue;
899
900                 switch (aci) {
901                 case 1: /* AC_BK */
902                         queue = 3;
903                         if (acm)
904                                 local->wmm_acm |= BIT(1) | BIT(2); /* BK/- */
905                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BK)
906                                 uapsd = true;
907                         break;
908                 case 2: /* AC_VI */
909                         queue = 1;
910                         if (acm)
911                                 local->wmm_acm |= BIT(4) | BIT(5); /* CL/VI */
912                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VI)
913                                 uapsd = true;
914                         break;
915                 case 3: /* AC_VO */
916                         queue = 0;
917                         if (acm)
918                                 local->wmm_acm |= BIT(6) | BIT(7); /* VO/NC */
919                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO)
920                                 uapsd = true;
921                         break;
922                 case 0: /* AC_BE */
923                 default:
924                         queue = 2;
925                         if (acm)
926                                 local->wmm_acm |= BIT(0) | BIT(3); /* BE/EE */
927                         if (uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_BE)
928                                 uapsd = true;
929                         break;
930                 }
931
932                 params.aifs = pos[0] & 0x0f;
933                 params.cw_max = ecw2cw((pos[1] & 0xf0) >> 4);
934                 params.cw_min = ecw2cw(pos[1] & 0x0f);
935                 params.txop = get_unaligned_le16(pos + 2);
936                 params.uapsd = uapsd;
937
938 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
939                 wiphy_debug(local->hw.wiphy,
940                             "WMM queue=%d aci=%d acm=%d aifs=%d "
941                             "cWmin=%d cWmax=%d txop=%d uapsd=%d\n",
942                             queue, aci, acm,
943                             params.aifs, params.cw_min, params.cw_max,
944                             params.txop, params.uapsd);
945 #endif
946                 sdata->tx_conf[queue] = params;
947                 if (drv_conf_tx(local, sdata, queue, &params))
948                         wiphy_debug(local->hw.wiphy,
949                                     "failed to set TX queue parameters for queue %d\n",
950                                     queue);
951         }
952
953         /* enable WMM or activate new settings */
954         sdata->vif.bss_conf.qos = true;
955         ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
956 }
957
958 static u32 ieee80211_handle_bss_capability(struct ieee80211_sub_if_data *sdata,
959                                            u16 capab, bool erp_valid, u8 erp)
960 {
961         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
962         u32 changed = 0;
963         bool use_protection;
964         bool use_short_preamble;
965         bool use_short_slot;
966
967         if (erp_valid) {
968                 use_protection = (erp & WLAN_ERP_USE_PROTECTION) != 0;
969                 use_short_preamble = (erp & WLAN_ERP_BARKER_PREAMBLE) == 0;
970         } else {
971                 use_protection = false;
972                 use_short_preamble = !!(capab & WLAN_CAPABILITY_SHORT_PREAMBLE);
973         }
974
975         use_short_slot = !!(capab & WLAN_CAPABILITY_SHORT_SLOT_TIME);
976         if (sdata->local->hw.conf.channel->band == IEEE80211_BAND_5GHZ)
977                 use_short_slot = true;
978
979         if (use_protection != bss_conf->use_cts_prot) {
980                 bss_conf->use_cts_prot = use_protection;
981                 changed |= BSS_CHANGED_ERP_CTS_PROT;
982         }
983
984         if (use_short_preamble != bss_conf->use_short_preamble) {
985                 bss_conf->use_short_preamble = use_short_preamble;
986                 changed |= BSS_CHANGED_ERP_PREAMBLE;
987         }
988
989         if (use_short_slot != bss_conf->use_short_slot) {
990                 bss_conf->use_short_slot = use_short_slot;
991                 changed |= BSS_CHANGED_ERP_SLOT;
992         }
993
994         return changed;
995 }
996
997 static void ieee80211_set_associated(struct ieee80211_sub_if_data *sdata,
998                                      struct cfg80211_bss *cbss,
999                                      u32 bss_info_changed)
1000 {
1001         struct ieee80211_bss *bss = (void *)cbss->priv;
1002         struct ieee80211_local *local = sdata->local;
1003         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1004
1005         bss_info_changed |= BSS_CHANGED_ASSOC;
1006         /* set timing information */
1007         bss_conf->beacon_int = cbss->beacon_interval;
1008         bss_conf->timestamp = cbss->tsf;
1009
1010         bss_info_changed |= BSS_CHANGED_BEACON_INT;
1011         bss_info_changed |= ieee80211_handle_bss_capability(sdata,
1012                 cbss->capability, bss->has_erp_value, bss->erp_value);
1013
1014         sdata->u.mgd.beacon_timeout = usecs_to_jiffies(ieee80211_tu_to_usec(
1015                 IEEE80211_BEACON_LOSS_COUNT * bss_conf->beacon_int));
1016
1017         sdata->u.mgd.associated = cbss;
1018         memcpy(sdata->u.mgd.bssid, cbss->bssid, ETH_ALEN);
1019
1020         sdata->u.mgd.flags |= IEEE80211_STA_RESET_SIGNAL_AVE;
1021
1022         /* just to be sure */
1023         sdata->u.mgd.flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1024                                 IEEE80211_STA_BEACON_POLL);
1025
1026         ieee80211_led_assoc(local, 1);
1027
1028         if (local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
1029                 bss_conf->dtim_period = bss->dtim_period;
1030         else
1031                 bss_conf->dtim_period = 0;
1032
1033         bss_conf->assoc = 1;
1034         /*
1035          * For now just always ask the driver to update the basic rateset
1036          * when we have associated, we aren't checking whether it actually
1037          * changed or not.
1038          */
1039         bss_info_changed |= BSS_CHANGED_BASIC_RATES;
1040
1041         /* And the BSSID changed - we're associated now */
1042         bss_info_changed |= BSS_CHANGED_BSSID;
1043
1044         /* Tell the driver to monitor connection quality (if supported) */
1045         if ((local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI) &&
1046             bss_conf->cqm_rssi_thold)
1047                 bss_info_changed |= BSS_CHANGED_CQM;
1048
1049         /* Enable ARP filtering */
1050         if (bss_conf->arp_filter_enabled != sdata->arp_filter_state) {
1051                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
1052                 bss_info_changed |= BSS_CHANGED_ARP_FILTER;
1053         }
1054
1055         ieee80211_bss_info_change_notify(sdata, bss_info_changed);
1056
1057         mutex_lock(&local->iflist_mtx);
1058         ieee80211_recalc_ps(local, -1);
1059         ieee80211_recalc_smps(local);
1060         mutex_unlock(&local->iflist_mtx);
1061
1062         netif_tx_start_all_queues(sdata->dev);
1063         netif_carrier_on(sdata->dev);
1064 }
1065
1066 static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
1067                                    bool remove_sta, bool tx)
1068 {
1069         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1070         struct ieee80211_local *local = sdata->local;
1071         struct sta_info *sta;
1072         u32 changed = 0, config_changed = 0;
1073         u8 bssid[ETH_ALEN];
1074
1075         ASSERT_MGD_MTX(ifmgd);
1076
1077         if (WARN_ON(!ifmgd->associated))
1078                 return;
1079
1080         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1081
1082         ifmgd->associated = NULL;
1083         memset(ifmgd->bssid, 0, ETH_ALEN);
1084
1085         /*
1086          * we need to commit the associated = NULL change because the
1087          * scan code uses that to determine whether this iface should
1088          * go to/wake up from powersave or not -- and could otherwise
1089          * wake the queues erroneously.
1090          */
1091         smp_mb();
1092
1093         /*
1094          * Thus, we can only afterwards stop the queues -- to account
1095          * for the case where another CPU is finishing a scan at this
1096          * time -- we don't want the scan code to enable queues.
1097          */
1098
1099         netif_tx_stop_all_queues(sdata->dev);
1100         netif_carrier_off(sdata->dev);
1101
1102         mutex_lock(&local->sta_mtx);
1103         sta = sta_info_get(sdata, bssid);
1104         if (sta) {
1105                 set_sta_flag(sta, WLAN_STA_BLOCK_BA);
1106                 ieee80211_sta_tear_down_BA_sessions(sta, tx);
1107         }
1108         mutex_unlock(&local->sta_mtx);
1109
1110         changed |= ieee80211_reset_erp_info(sdata);
1111
1112         ieee80211_led_assoc(local, 0);
1113         changed |= BSS_CHANGED_ASSOC;
1114         sdata->vif.bss_conf.assoc = false;
1115
1116         ieee80211_set_wmm_default(sdata);
1117
1118         /* channel(_type) changes are handled by ieee80211_hw_config */
1119         WARN_ON(!ieee80211_set_channel_type(local, sdata, NL80211_CHAN_NO_HT));
1120
1121         /* on the next assoc, re-program HT parameters */
1122         sdata->ht_opmode_valid = false;
1123
1124         local->power_constr_level = 0;
1125
1126         del_timer_sync(&local->dynamic_ps_timer);
1127         cancel_work_sync(&local->dynamic_ps_enable_work);
1128
1129         if (local->hw.conf.flags & IEEE80211_CONF_PS) {
1130                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1131                 config_changed |= IEEE80211_CONF_CHANGE_PS;
1132         }
1133         local->ps_sdata = NULL;
1134
1135         ieee80211_hw_config(local, config_changed);
1136
1137         /* Disable ARP filtering */
1138         if (sdata->vif.bss_conf.arp_filter_enabled) {
1139                 sdata->vif.bss_conf.arp_filter_enabled = false;
1140                 changed |= BSS_CHANGED_ARP_FILTER;
1141         }
1142
1143         /* The BSSID (not really interesting) and HT changed */
1144         changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
1145         ieee80211_bss_info_change_notify(sdata, changed);
1146
1147         /* remove AP and TDLS peers */
1148         if (remove_sta)
1149                 sta_info_flush(local, sdata);
1150
1151         del_timer_sync(&sdata->u.mgd.conn_mon_timer);
1152         del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
1153         del_timer_sync(&sdata->u.mgd.timer);
1154         del_timer_sync(&sdata->u.mgd.chswitch_timer);
1155 }
1156
1157 void ieee80211_sta_rx_notify(struct ieee80211_sub_if_data *sdata,
1158                              struct ieee80211_hdr *hdr)
1159 {
1160         /*
1161          * We can postpone the mgd.timer whenever receiving unicast frames
1162          * from AP because we know that the connection is working both ways
1163          * at that time. But multicast frames (and hence also beacons) must
1164          * be ignored here, because we need to trigger the timer during
1165          * data idle periods for sending the periodic probe request to the
1166          * AP we're connected to.
1167          */
1168         if (is_multicast_ether_addr(hdr->addr1))
1169                 return;
1170
1171         ieee80211_sta_reset_conn_monitor(sdata);
1172 }
1173
1174 static void ieee80211_reset_ap_probe(struct ieee80211_sub_if_data *sdata)
1175 {
1176         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1177
1178         if (!(ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1179                               IEEE80211_STA_CONNECTION_POLL)))
1180             return;
1181
1182         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
1183                           IEEE80211_STA_BEACON_POLL);
1184         mutex_lock(&sdata->local->iflist_mtx);
1185         ieee80211_recalc_ps(sdata->local, -1);
1186         mutex_unlock(&sdata->local->iflist_mtx);
1187
1188         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1189                 return;
1190
1191         /*
1192          * We've received a probe response, but are not sure whether
1193          * we have or will be receiving any beacons or data, so let's
1194          * schedule the timers again, just in case.
1195          */
1196         ieee80211_sta_reset_beacon_monitor(sdata);
1197
1198         mod_timer(&ifmgd->conn_mon_timer,
1199                   round_jiffies_up(jiffies +
1200                                    IEEE80211_CONNECTION_IDLE_TIME));
1201 }
1202
1203 void ieee80211_sta_tx_notify(struct ieee80211_sub_if_data *sdata,
1204                              struct ieee80211_hdr *hdr, bool ack)
1205 {
1206         if (!ieee80211_is_data(hdr->frame_control))
1207             return;
1208
1209         if (ack)
1210                 ieee80211_sta_reset_conn_monitor(sdata);
1211
1212         if (ieee80211_is_nullfunc(hdr->frame_control) &&
1213             sdata->u.mgd.probe_send_count > 0) {
1214                 if (ack)
1215                         sdata->u.mgd.probe_send_count = 0;
1216                 else
1217                         sdata->u.mgd.nullfunc_failed = true;
1218                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
1219         }
1220 }
1221
1222 static void ieee80211_mgd_probe_ap_send(struct ieee80211_sub_if_data *sdata)
1223 {
1224         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1225         const u8 *ssid;
1226         u8 *dst = ifmgd->associated->bssid;
1227         u8 unicast_limit = max(1, max_probe_tries - 3);
1228
1229         /*
1230          * Try sending broadcast probe requests for the last three
1231          * probe requests after the first ones failed since some
1232          * buggy APs only support broadcast probe requests.
1233          */
1234         if (ifmgd->probe_send_count >= unicast_limit)
1235                 dst = NULL;
1236
1237         /*
1238          * When the hardware reports an accurate Tx ACK status, it's
1239          * better to send a nullfunc frame instead of a probe request,
1240          * as it will kick us off the AP quickly if we aren't associated
1241          * anymore. The timeout will be reset if the frame is ACKed by
1242          * the AP.
1243          */
1244         if (sdata->local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
1245                 ifmgd->nullfunc_failed = false;
1246                 ieee80211_send_nullfunc(sdata->local, sdata, 0);
1247         } else {
1248                 ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1249                 ieee80211_send_probe_req(sdata, dst, ssid + 2, ssid[1], NULL, 0,
1250                                          (u32) -1, true, false);
1251         }
1252
1253         ifmgd->probe_send_count++;
1254         ifmgd->probe_timeout = jiffies + msecs_to_jiffies(probe_wait_ms);
1255         run_again(ifmgd, ifmgd->probe_timeout);
1256 }
1257
1258 static void ieee80211_mgd_probe_ap(struct ieee80211_sub_if_data *sdata,
1259                                    bool beacon)
1260 {
1261         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1262         bool already = false;
1263
1264         if (!ieee80211_sdata_running(sdata))
1265                 return;
1266
1267         if (sdata->local->scanning)
1268                 return;
1269
1270         if (sdata->local->tmp_channel)
1271                 return;
1272
1273         mutex_lock(&ifmgd->mtx);
1274
1275         if (!ifmgd->associated)
1276                 goto out;
1277
1278 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1279         if (beacon && net_ratelimit())
1280                 printk(KERN_DEBUG "%s: detected beacon loss from AP "
1281                        "- sending probe request\n", sdata->name);
1282 #endif
1283
1284         /*
1285          * The driver/our work has already reported this event or the
1286          * connection monitoring has kicked in and we have already sent
1287          * a probe request. Or maybe the AP died and the driver keeps
1288          * reporting until we disassociate...
1289          *
1290          * In either case we have to ignore the current call to this
1291          * function (except for setting the correct probe reason bit)
1292          * because otherwise we would reset the timer every time and
1293          * never check whether we received a probe response!
1294          */
1295         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
1296                             IEEE80211_STA_CONNECTION_POLL))
1297                 already = true;
1298
1299         if (beacon)
1300                 ifmgd->flags |= IEEE80211_STA_BEACON_POLL;
1301         else
1302                 ifmgd->flags |= IEEE80211_STA_CONNECTION_POLL;
1303
1304         if (already)
1305                 goto out;
1306
1307         mutex_lock(&sdata->local->iflist_mtx);
1308         ieee80211_recalc_ps(sdata->local, -1);
1309         mutex_unlock(&sdata->local->iflist_mtx);
1310
1311         ifmgd->probe_send_count = 0;
1312         ieee80211_mgd_probe_ap_send(sdata);
1313  out:
1314         mutex_unlock(&ifmgd->mtx);
1315 }
1316
1317 struct sk_buff *ieee80211_ap_probereq_get(struct ieee80211_hw *hw,
1318                                           struct ieee80211_vif *vif)
1319 {
1320         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1321         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1322         struct sk_buff *skb;
1323         const u8 *ssid;
1324
1325         if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1326                 return NULL;
1327
1328         ASSERT_MGD_MTX(ifmgd);
1329
1330         if (!ifmgd->associated)
1331                 return NULL;
1332
1333         ssid = ieee80211_bss_get_ie(ifmgd->associated, WLAN_EID_SSID);
1334         skb = ieee80211_build_probe_req(sdata, ifmgd->associated->bssid,
1335                                         (u32) -1, ssid + 2, ssid[1],
1336                                         NULL, 0, true);
1337
1338         return skb;
1339 }
1340 EXPORT_SYMBOL(ieee80211_ap_probereq_get);
1341
1342 static void __ieee80211_connection_loss(struct ieee80211_sub_if_data *sdata)
1343 {
1344         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1345         struct ieee80211_local *local = sdata->local;
1346         u8 bssid[ETH_ALEN];
1347
1348         mutex_lock(&ifmgd->mtx);
1349         if (!ifmgd->associated) {
1350                 mutex_unlock(&ifmgd->mtx);
1351                 return;
1352         }
1353
1354         memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
1355
1356         printk(KERN_DEBUG "%s: Connection to AP %pM lost.\n",
1357                sdata->name, bssid);
1358
1359         ieee80211_set_disassoc(sdata, true, true);
1360         mutex_unlock(&ifmgd->mtx);
1361
1362         mutex_lock(&local->mtx);
1363         ieee80211_recalc_idle(local);
1364         mutex_unlock(&local->mtx);
1365         /*
1366          * must be outside lock due to cfg80211,
1367          * but that's not a problem.
1368          */
1369         ieee80211_send_deauth_disassoc(sdata, bssid,
1370                                        IEEE80211_STYPE_DEAUTH,
1371                                        WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY,
1372                                        NULL, true);
1373 }
1374
1375 void ieee80211_beacon_connection_loss_work(struct work_struct *work)
1376 {
1377         struct ieee80211_sub_if_data *sdata =
1378                 container_of(work, struct ieee80211_sub_if_data,
1379                              u.mgd.beacon_connection_loss_work);
1380
1381         if (sdata->local->hw.flags & IEEE80211_HW_CONNECTION_MONITOR)
1382                 __ieee80211_connection_loss(sdata);
1383         else
1384                 ieee80211_mgd_probe_ap(sdata, true);
1385 }
1386
1387 void ieee80211_beacon_loss(struct ieee80211_vif *vif)
1388 {
1389         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1390         struct ieee80211_hw *hw = &sdata->local->hw;
1391
1392         trace_api_beacon_loss(sdata);
1393
1394         WARN_ON(hw->flags & IEEE80211_HW_CONNECTION_MONITOR);
1395         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1396 }
1397 EXPORT_SYMBOL(ieee80211_beacon_loss);
1398
1399 void ieee80211_connection_loss(struct ieee80211_vif *vif)
1400 {
1401         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1402         struct ieee80211_hw *hw = &sdata->local->hw;
1403
1404         trace_api_connection_loss(sdata);
1405
1406         WARN_ON(!(hw->flags & IEEE80211_HW_CONNECTION_MONITOR));
1407         ieee80211_queue_work(hw, &sdata->u.mgd.beacon_connection_loss_work);
1408 }
1409 EXPORT_SYMBOL(ieee80211_connection_loss);
1410
1411
1412 static enum rx_mgmt_action __must_check
1413 ieee80211_rx_mgmt_deauth(struct ieee80211_sub_if_data *sdata,
1414                          struct ieee80211_mgmt *mgmt, size_t len)
1415 {
1416         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1417         const u8 *bssid = NULL;
1418         u16 reason_code;
1419
1420         if (len < 24 + 2)
1421                 return RX_MGMT_NONE;
1422
1423         ASSERT_MGD_MTX(ifmgd);
1424
1425         bssid = ifmgd->associated->bssid;
1426
1427         reason_code = le16_to_cpu(mgmt->u.deauth.reason_code);
1428
1429         printk(KERN_DEBUG "%s: deauthenticated from %pM (Reason: %u)\n",
1430                         sdata->name, bssid, reason_code);
1431
1432         ieee80211_set_disassoc(sdata, true, false);
1433         mutex_lock(&sdata->local->mtx);
1434         ieee80211_recalc_idle(sdata->local);
1435         mutex_unlock(&sdata->local->mtx);
1436
1437         return RX_MGMT_CFG80211_DEAUTH;
1438 }
1439
1440
1441 static enum rx_mgmt_action __must_check
1442 ieee80211_rx_mgmt_disassoc(struct ieee80211_sub_if_data *sdata,
1443                            struct ieee80211_mgmt *mgmt, size_t len)
1444 {
1445         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1446         u16 reason_code;
1447
1448         if (len < 24 + 2)
1449                 return RX_MGMT_NONE;
1450
1451         ASSERT_MGD_MTX(ifmgd);
1452
1453         if (WARN_ON(!ifmgd->associated))
1454                 return RX_MGMT_NONE;
1455
1456         if (WARN_ON(memcmp(ifmgd->associated->bssid, mgmt->sa, ETH_ALEN)))
1457                 return RX_MGMT_NONE;
1458
1459         reason_code = le16_to_cpu(mgmt->u.disassoc.reason_code);
1460
1461         printk(KERN_DEBUG "%s: disassociated from %pM (Reason: %u)\n",
1462                         sdata->name, mgmt->sa, reason_code);
1463
1464         ieee80211_set_disassoc(sdata, true, false);
1465         mutex_lock(&sdata->local->mtx);
1466         ieee80211_recalc_idle(sdata->local);
1467         mutex_unlock(&sdata->local->mtx);
1468         return RX_MGMT_CFG80211_DISASSOC;
1469 }
1470
1471
1472 static bool ieee80211_assoc_success(struct ieee80211_work *wk,
1473                                     struct ieee80211_mgmt *mgmt, size_t len)
1474 {
1475         struct ieee80211_sub_if_data *sdata = wk->sdata;
1476         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1477         struct ieee80211_local *local = sdata->local;
1478         struct ieee80211_supported_band *sband;
1479         struct sta_info *sta;
1480         struct cfg80211_bss *cbss = wk->assoc.bss;
1481         u8 *pos;
1482         u32 rates, basic_rates;
1483         u16 capab_info, aid;
1484         struct ieee802_11_elems elems;
1485         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1486         u32 changed = 0;
1487         int i, j, err;
1488         bool have_higher_than_11mbit = false;
1489         u16 ap_ht_cap_flags;
1490
1491         /* AssocResp and ReassocResp have identical structure */
1492
1493         aid = le16_to_cpu(mgmt->u.assoc_resp.aid);
1494         capab_info = le16_to_cpu(mgmt->u.assoc_resp.capab_info);
1495
1496         if ((aid & (BIT(15) | BIT(14))) != (BIT(15) | BIT(14)))
1497                 printk(KERN_DEBUG
1498                        "%s: invalid AID value 0x%x; bits 15:14 not set\n",
1499                        sdata->name, aid);
1500         aid &= ~(BIT(15) | BIT(14));
1501
1502         ifmgd->broken_ap = false;
1503
1504         if (aid == 0 || aid > IEEE80211_MAX_AID) {
1505                 printk(KERN_DEBUG
1506                        "%s: invalid AID value %d (out of range), turn off PS\n",
1507                        sdata->name, aid);
1508                 aid = 0;
1509                 ifmgd->broken_ap = true;
1510         }
1511
1512         pos = mgmt->u.assoc_resp.variable;
1513         ieee802_11_parse_elems(pos, len - (pos - (u8 *) mgmt), &elems);
1514
1515         if (!elems.supp_rates) {
1516                 printk(KERN_DEBUG "%s: no SuppRates element in AssocResp\n",
1517                        sdata->name);
1518                 return false;
1519         }
1520
1521         ifmgd->aid = aid;
1522
1523         mutex_lock(&sdata->local->sta_mtx);
1524         /*
1525          * station info was already allocated and inserted before
1526          * the association and should be available to us
1527          */
1528         sta = sta_info_get_rx(sdata, cbss->bssid);
1529         if (WARN_ON(!sta)) {
1530                 mutex_unlock(&sdata->local->sta_mtx);
1531                 return false;
1532         }
1533
1534         set_sta_flag(sta, WLAN_STA_AUTH);
1535         set_sta_flag(sta, WLAN_STA_ASSOC);
1536         set_sta_flag(sta, WLAN_STA_ASSOC_AP);
1537         if (!(ifmgd->flags & IEEE80211_STA_CONTROL_PORT))
1538                 set_sta_flag(sta, WLAN_STA_AUTHORIZED);
1539
1540         rates = 0;
1541         basic_rates = 0;
1542         sband = local->hw.wiphy->bands[wk->chan->band];
1543
1544         for (i = 0; i < elems.supp_rates_len; i++) {
1545                 int rate = (elems.supp_rates[i] & 0x7f) * 5;
1546                 bool is_basic = !!(elems.supp_rates[i] & 0x80);
1547
1548                 if (rate > 110)
1549                         have_higher_than_11mbit = true;
1550
1551                 for (j = 0; j < sband->n_bitrates; j++) {
1552                         if (sband->bitrates[j].bitrate == rate) {
1553                                 rates |= BIT(j);
1554                                 if (is_basic)
1555                                         basic_rates |= BIT(j);
1556                                 break;
1557                         }
1558                 }
1559         }
1560
1561         for (i = 0; i < elems.ext_supp_rates_len; i++) {
1562                 int rate = (elems.ext_supp_rates[i] & 0x7f) * 5;
1563                 bool is_basic = !!(elems.ext_supp_rates[i] & 0x80);
1564
1565                 if (rate > 110)
1566                         have_higher_than_11mbit = true;
1567
1568                 for (j = 0; j < sband->n_bitrates; j++) {
1569                         if (sband->bitrates[j].bitrate == rate) {
1570                                 rates |= BIT(j);
1571                                 if (is_basic)
1572                                         basic_rates |= BIT(j);
1573                                 break;
1574                         }
1575                 }
1576         }
1577
1578         sta->sta.supp_rates[wk->chan->band] = rates;
1579         sdata->vif.bss_conf.basic_rates = basic_rates;
1580
1581         /* cf. IEEE 802.11 9.2.12 */
1582         if (wk->chan->band == IEEE80211_BAND_2GHZ &&
1583             have_higher_than_11mbit)
1584                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
1585         else
1586                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
1587
1588         if (elems.ht_cap_elem && !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1589                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1590                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1591
1592         ap_ht_cap_flags = sta->sta.ht_cap.cap;
1593
1594         rate_control_rate_init(sta);
1595
1596         if (ifmgd->flags & IEEE80211_STA_MFP_ENABLED)
1597                 set_sta_flag(sta, WLAN_STA_MFP);
1598
1599         if (elems.wmm_param)
1600                 set_sta_flag(sta, WLAN_STA_WME);
1601
1602         /* sta_info_reinsert will also unlock the mutex lock */
1603         err = sta_info_reinsert(sta);
1604         sta = NULL;
1605         if (err) {
1606                 printk(KERN_DEBUG "%s: failed to insert STA entry for"
1607                        " the AP (error %d)\n", sdata->name, err);
1608                 return false;
1609         }
1610
1611         /*
1612          * Always handle WMM once after association regardless
1613          * of the first value the AP uses. Setting -1 here has
1614          * that effect because the AP values is an unsigned
1615          * 4-bit value.
1616          */
1617         ifmgd->wmm_last_param_set = -1;
1618
1619         if (elems.wmm_param)
1620                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1621                                          elems.wmm_param_len);
1622         else
1623                 ieee80211_set_wmm_default(sdata);
1624
1625         local->oper_channel = wk->chan;
1626
1627         if (elems.ht_info_elem && elems.wmm_param &&
1628             (sdata->local->hw.queues >= 4) &&
1629             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N))
1630                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1631                                                cbss->bssid, ap_ht_cap_flags,
1632                                                false);
1633
1634         /* set AID and assoc capability,
1635          * ieee80211_set_associated() will tell the driver */
1636         bss_conf->aid = aid;
1637         bss_conf->assoc_capability = capab_info;
1638         ieee80211_set_associated(sdata, cbss, changed);
1639
1640         /*
1641          * If we're using 4-addr mode, let the AP know that we're
1642          * doing so, so that it can create the STA VLAN on its side
1643          */
1644         if (ifmgd->use_4addr)
1645                 ieee80211_send_4addr_nullfunc(local, sdata);
1646
1647         /*
1648          * Start timer to probe the connection to the AP now.
1649          * Also start the timer that will detect beacon loss.
1650          */
1651         ieee80211_sta_rx_notify(sdata, (struct ieee80211_hdr *)mgmt);
1652         ieee80211_sta_reset_beacon_monitor(sdata);
1653
1654         return true;
1655 }
1656
1657
1658 static void ieee80211_rx_bss_info(struct ieee80211_sub_if_data *sdata,
1659                                   struct ieee80211_mgmt *mgmt,
1660                                   size_t len,
1661                                   struct ieee80211_rx_status *rx_status,
1662                                   struct ieee802_11_elems *elems,
1663                                   bool beacon)
1664 {
1665         struct ieee80211_local *local = sdata->local;
1666         int freq;
1667         struct ieee80211_bss *bss;
1668         struct ieee80211_channel *channel;
1669         bool need_ps = false;
1670
1671         if (sdata->u.mgd.associated) {
1672                 bss = (void *)sdata->u.mgd.associated->priv;
1673                 /* not previously set so we may need to recalc */
1674                 need_ps = !bss->dtim_period;
1675         }
1676
1677         if (elems->ds_params && elems->ds_params_len == 1)
1678                 freq = ieee80211_channel_to_frequency(elems->ds_params[0],
1679                                                       rx_status->band);
1680         else
1681                 freq = rx_status->freq;
1682
1683         channel = ieee80211_get_channel(local->hw.wiphy, freq);
1684
1685         if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
1686                 return;
1687
1688         bss = ieee80211_bss_info_update(local, rx_status, mgmt, len, elems,
1689                                         channel, beacon);
1690         if (bss)
1691                 ieee80211_rx_bss_put(local, bss);
1692
1693         if (!sdata->u.mgd.associated)
1694                 return;
1695
1696         if (need_ps) {
1697                 mutex_lock(&local->iflist_mtx);
1698                 ieee80211_recalc_ps(local, -1);
1699                 mutex_unlock(&local->iflist_mtx);
1700         }
1701
1702         if (elems->ch_switch_elem && (elems->ch_switch_elem_len == 3) &&
1703             (memcmp(mgmt->bssid, sdata->u.mgd.associated->bssid,
1704                                                         ETH_ALEN) == 0)) {
1705                 struct ieee80211_channel_sw_ie *sw_elem =
1706                         (struct ieee80211_channel_sw_ie *)elems->ch_switch_elem;
1707                 ieee80211_sta_process_chanswitch(sdata, sw_elem,
1708                                                  bss, rx_status->mactime);
1709         }
1710 }
1711
1712
1713 static void ieee80211_rx_mgmt_probe_resp(struct ieee80211_sub_if_data *sdata,
1714                                          struct sk_buff *skb)
1715 {
1716         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1717         struct ieee80211_if_managed *ifmgd;
1718         struct ieee80211_rx_status *rx_status = (void *) skb->cb;
1719         size_t baselen, len = skb->len;
1720         struct ieee802_11_elems elems;
1721
1722         ifmgd = &sdata->u.mgd;
1723
1724         ASSERT_MGD_MTX(ifmgd);
1725
1726         if (memcmp(mgmt->da, sdata->vif.addr, ETH_ALEN))
1727                 return; /* ignore ProbeResp to foreign address */
1728
1729         baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
1730         if (baselen > len)
1731                 return;
1732
1733         ieee802_11_parse_elems(mgmt->u.probe_resp.variable, len - baselen,
1734                                 &elems);
1735
1736         ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems, false);
1737
1738         if (ifmgd->associated &&
1739             memcmp(mgmt->bssid, ifmgd->associated->bssid, ETH_ALEN) == 0)
1740                 ieee80211_reset_ap_probe(sdata);
1741 }
1742
1743 /*
1744  * This is the canonical list of information elements we care about,
1745  * the filter code also gives us all changes to the Microsoft OUI
1746  * (00:50:F2) vendor IE which is used for WMM which we need to track.
1747  *
1748  * We implement beacon filtering in software since that means we can
1749  * avoid processing the frame here and in cfg80211, and userspace
1750  * will not be able to tell whether the hardware supports it or not.
1751  *
1752  * XXX: This list needs to be dynamic -- userspace needs to be able to
1753  *      add items it requires. It also needs to be able to tell us to
1754  *      look out for other vendor IEs.
1755  */
1756 static const u64 care_about_ies =
1757         (1ULL << WLAN_EID_COUNTRY) |
1758         (1ULL << WLAN_EID_ERP_INFO) |
1759         (1ULL << WLAN_EID_CHANNEL_SWITCH) |
1760         (1ULL << WLAN_EID_PWR_CONSTRAINT) |
1761         (1ULL << WLAN_EID_HT_CAPABILITY) |
1762         (1ULL << WLAN_EID_HT_INFORMATION);
1763
1764 static void ieee80211_rx_mgmt_beacon(struct ieee80211_sub_if_data *sdata,
1765                                      struct ieee80211_mgmt *mgmt,
1766                                      size_t len,
1767                                      struct ieee80211_rx_status *rx_status)
1768 {
1769         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1770         struct ieee80211_bss_conf *bss_conf = &sdata->vif.bss_conf;
1771         size_t baselen;
1772         struct ieee802_11_elems elems;
1773         struct ieee80211_local *local = sdata->local;
1774         u32 changed = 0;
1775         bool erp_valid, directed_tim = false;
1776         u8 erp_value = 0;
1777         u32 ncrc;
1778         u8 *bssid;
1779
1780         ASSERT_MGD_MTX(ifmgd);
1781
1782         /* Process beacon from the current BSS */
1783         baselen = (u8 *) mgmt->u.beacon.variable - (u8 *) mgmt;
1784         if (baselen > len)
1785                 return;
1786
1787         if (rx_status->freq != local->hw.conf.channel->center_freq)
1788                 return;
1789
1790         /*
1791          * We might have received a number of frames, among them a
1792          * disassoc frame and a beacon...
1793          */
1794         if (!ifmgd->associated)
1795                 return;
1796
1797         bssid = ifmgd->associated->bssid;
1798
1799         /*
1800          * And in theory even frames from a different AP we were just
1801          * associated to a split-second ago!
1802          */
1803         if (memcmp(bssid, mgmt->bssid, ETH_ALEN) != 0)
1804                 return;
1805
1806         /* Track average RSSI from the Beacon frames of the current AP */
1807         ifmgd->last_beacon_signal = rx_status->signal;
1808         if (ifmgd->flags & IEEE80211_STA_RESET_SIGNAL_AVE) {
1809                 ifmgd->flags &= ~IEEE80211_STA_RESET_SIGNAL_AVE;
1810                 ifmgd->ave_beacon_signal = rx_status->signal * 16;
1811                 ifmgd->last_cqm_event_signal = 0;
1812                 ifmgd->count_beacon_signal = 1;
1813                 ifmgd->last_ave_beacon_signal = 0;
1814         } else {
1815                 ifmgd->ave_beacon_signal =
1816                         (IEEE80211_SIGNAL_AVE_WEIGHT * rx_status->signal * 16 +
1817                          (16 - IEEE80211_SIGNAL_AVE_WEIGHT) *
1818                          ifmgd->ave_beacon_signal) / 16;
1819                 ifmgd->count_beacon_signal++;
1820         }
1821
1822         if (ifmgd->rssi_min_thold != ifmgd->rssi_max_thold &&
1823             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT) {
1824                 int sig = ifmgd->ave_beacon_signal;
1825                 int last_sig = ifmgd->last_ave_beacon_signal;
1826
1827                 /*
1828                  * if signal crosses either of the boundaries, invoke callback
1829                  * with appropriate parameters
1830                  */
1831                 if (sig > ifmgd->rssi_max_thold &&
1832                     (last_sig <= ifmgd->rssi_min_thold || last_sig == 0)) {
1833                         ifmgd->last_ave_beacon_signal = sig;
1834                         drv_rssi_callback(local, RSSI_EVENT_HIGH);
1835                 } else if (sig < ifmgd->rssi_min_thold &&
1836                            (last_sig >= ifmgd->rssi_max_thold ||
1837                            last_sig == 0)) {
1838                         ifmgd->last_ave_beacon_signal = sig;
1839                         drv_rssi_callback(local, RSSI_EVENT_LOW);
1840                 }
1841         }
1842
1843         if (bss_conf->cqm_rssi_thold &&
1844             ifmgd->count_beacon_signal >= IEEE80211_SIGNAL_AVE_MIN_COUNT &&
1845             !(local->hw.flags & IEEE80211_HW_SUPPORTS_CQM_RSSI)) {
1846                 int sig = ifmgd->ave_beacon_signal / 16;
1847                 int last_event = ifmgd->last_cqm_event_signal;
1848                 int thold = bss_conf->cqm_rssi_thold;
1849                 int hyst = bss_conf->cqm_rssi_hyst;
1850                 if (sig < thold &&
1851                     (last_event == 0 || sig < last_event - hyst)) {
1852                         ifmgd->last_cqm_event_signal = sig;
1853                         ieee80211_cqm_rssi_notify(
1854                                 &sdata->vif,
1855                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_LOW,
1856                                 GFP_KERNEL);
1857                 } else if (sig > thold &&
1858                            (last_event == 0 || sig > last_event + hyst)) {
1859                         ifmgd->last_cqm_event_signal = sig;
1860                         ieee80211_cqm_rssi_notify(
1861                                 &sdata->vif,
1862                                 NL80211_CQM_RSSI_THRESHOLD_EVENT_HIGH,
1863                                 GFP_KERNEL);
1864                 }
1865         }
1866
1867         if (ifmgd->flags & IEEE80211_STA_BEACON_POLL) {
1868 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1869                 if (net_ratelimit()) {
1870                         printk(KERN_DEBUG "%s: cancelling probereq poll due "
1871                                "to a received beacon\n", sdata->name);
1872                 }
1873 #endif
1874                 ifmgd->flags &= ~IEEE80211_STA_BEACON_POLL;
1875                 mutex_lock(&local->iflist_mtx);
1876                 ieee80211_recalc_ps(local, -1);
1877                 mutex_unlock(&local->iflist_mtx);
1878         }
1879
1880         /*
1881          * Push the beacon loss detection into the future since
1882          * we are processing a beacon from the AP just now.
1883          */
1884         ieee80211_sta_reset_beacon_monitor(sdata);
1885
1886         ncrc = crc32_be(0, (void *)&mgmt->u.beacon.beacon_int, 4);
1887         ncrc = ieee802_11_parse_elems_crc(mgmt->u.beacon.variable,
1888                                           len - baselen, &elems,
1889                                           care_about_ies, ncrc);
1890
1891         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK)
1892                 directed_tim = ieee80211_check_tim(elems.tim, elems.tim_len,
1893                                                    ifmgd->aid);
1894
1895         if (ncrc != ifmgd->beacon_crc || !ifmgd->beacon_crc_valid) {
1896                 ieee80211_rx_bss_info(sdata, mgmt, len, rx_status, &elems,
1897                                       true);
1898
1899                 ieee80211_sta_wmm_params(local, sdata, elems.wmm_param,
1900                                          elems.wmm_param_len);
1901         }
1902
1903         if (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK) {
1904                 if (directed_tim) {
1905                         if (local->hw.conf.dynamic_ps_timeout > 0) {
1906                                 local->hw.conf.flags &= ~IEEE80211_CONF_PS;
1907                                 ieee80211_hw_config(local,
1908                                                     IEEE80211_CONF_CHANGE_PS);
1909                                 ieee80211_send_nullfunc(local, sdata, 0);
1910                         } else {
1911                                 local->pspolling = true;
1912
1913                                 /*
1914                                  * Here is assumed that the driver will be
1915                                  * able to send ps-poll frame and receive a
1916                                  * response even though power save mode is
1917                                  * enabled, but some drivers might require
1918                                  * to disable power save here. This needs
1919                                  * to be investigated.
1920                                  */
1921                                 ieee80211_send_pspoll(local, sdata);
1922                         }
1923                 }
1924         }
1925
1926         if (ncrc == ifmgd->beacon_crc && ifmgd->beacon_crc_valid)
1927                 return;
1928         ifmgd->beacon_crc = ncrc;
1929         ifmgd->beacon_crc_valid = true;
1930
1931         if (elems.erp_info && elems.erp_info_len >= 1) {
1932                 erp_valid = true;
1933                 erp_value = elems.erp_info[0];
1934         } else {
1935                 erp_valid = false;
1936         }
1937         changed |= ieee80211_handle_bss_capability(sdata,
1938                         le16_to_cpu(mgmt->u.beacon.capab_info),
1939                         erp_valid, erp_value);
1940
1941
1942         if (elems.ht_cap_elem && elems.ht_info_elem && elems.wmm_param &&
1943             !(ifmgd->flags & IEEE80211_STA_DISABLE_11N)) {
1944                 struct sta_info *sta;
1945                 struct ieee80211_supported_band *sband;
1946                 u16 ap_ht_cap_flags;
1947
1948                 rcu_read_lock();
1949
1950                 sta = sta_info_get(sdata, bssid);
1951                 if (WARN_ON(!sta)) {
1952                         rcu_read_unlock();
1953                         return;
1954                 }
1955
1956                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1957
1958                 ieee80211_ht_cap_ie_to_sta_ht_cap(sband,
1959                                 elems.ht_cap_elem, &sta->sta.ht_cap);
1960
1961                 ap_ht_cap_flags = sta->sta.ht_cap.cap;
1962
1963                 rcu_read_unlock();
1964
1965                 changed |= ieee80211_enable_ht(sdata, elems.ht_info_elem,
1966                                                bssid, ap_ht_cap_flags, true);
1967         }
1968
1969         /* Note: country IE parsing is done for us by cfg80211 */
1970         if (elems.country_elem) {
1971                 /* TODO: IBSS also needs this */
1972                 if (elems.pwr_constr_elem)
1973                         ieee80211_handle_pwr_constr(sdata,
1974                                 le16_to_cpu(mgmt->u.probe_resp.capab_info),
1975                                 elems.pwr_constr_elem,
1976                                 elems.pwr_constr_elem_len);
1977         }
1978
1979         ieee80211_bss_info_change_notify(sdata, changed);
1980 }
1981
1982 void ieee80211_sta_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
1983                                   struct sk_buff *skb)
1984 {
1985         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1986         struct ieee80211_rx_status *rx_status;
1987         struct ieee80211_mgmt *mgmt;
1988         enum rx_mgmt_action rma = RX_MGMT_NONE;
1989         u16 fc;
1990
1991         rx_status = (struct ieee80211_rx_status *) skb->cb;
1992         mgmt = (struct ieee80211_mgmt *) skb->data;
1993         fc = le16_to_cpu(mgmt->frame_control);
1994
1995         mutex_lock(&ifmgd->mtx);
1996
1997         if (ifmgd->associated &&
1998             memcmp(ifmgd->associated->bssid, mgmt->bssid, ETH_ALEN) == 0) {
1999                 switch (fc & IEEE80211_FCTL_STYPE) {
2000                 case IEEE80211_STYPE_BEACON:
2001                         ieee80211_rx_mgmt_beacon(sdata, mgmt, skb->len,
2002                                                  rx_status);
2003                         break;
2004                 case IEEE80211_STYPE_PROBE_RESP:
2005                         ieee80211_rx_mgmt_probe_resp(sdata, skb);
2006                         break;
2007                 case IEEE80211_STYPE_DEAUTH:
2008                         rma = ieee80211_rx_mgmt_deauth(sdata, mgmt, skb->len);
2009                         break;
2010                 case IEEE80211_STYPE_DISASSOC:
2011                         rma = ieee80211_rx_mgmt_disassoc(sdata, mgmt, skb->len);
2012                         break;
2013                 case IEEE80211_STYPE_ACTION:
2014                         switch (mgmt->u.action.category) {
2015                         case WLAN_CATEGORY_SPECTRUM_MGMT:
2016                                 ieee80211_sta_process_chanswitch(sdata,
2017                                                 &mgmt->u.action.u.chan_switch.sw_elem,
2018                                                 (void *)ifmgd->associated->priv,
2019                                                 rx_status->mactime);
2020                                 break;
2021                         }
2022                 }
2023                 mutex_unlock(&ifmgd->mtx);
2024
2025                 switch (rma) {
2026                 case RX_MGMT_NONE:
2027                         /* no action */
2028                         break;
2029                 case RX_MGMT_CFG80211_DEAUTH:
2030                         cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
2031                         break;
2032                 case RX_MGMT_CFG80211_DISASSOC:
2033                         cfg80211_send_disassoc(sdata->dev, (u8 *)mgmt, skb->len);
2034                         break;
2035                 default:
2036                         WARN(1, "unexpected: %d", rma);
2037                 }
2038                 return;
2039         }
2040
2041         mutex_unlock(&ifmgd->mtx);
2042
2043         if (skb->len >= 24 + 2 /* mgmt + deauth reason */ &&
2044             (fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_DEAUTH) {
2045                 struct ieee80211_local *local = sdata->local;
2046                 struct ieee80211_work *wk;
2047
2048                 mutex_lock(&local->mtx);
2049                 list_for_each_entry(wk, &local->work_list, list) {
2050                         if (wk->sdata != sdata)
2051                                 continue;
2052
2053                         if (wk->type != IEEE80211_WORK_ASSOC &&
2054                             wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
2055                                 continue;
2056
2057                         if (memcmp(mgmt->bssid, wk->filter_ta, ETH_ALEN))
2058                                 continue;
2059                         if (memcmp(mgmt->sa, wk->filter_ta, ETH_ALEN))
2060                                 continue;
2061
2062                         /*
2063                          * Printing the message only here means we can't
2064                          * spuriously print it, but it also means that it
2065                          * won't be printed when the frame comes in before
2066                          * we even tried to associate or in similar cases.
2067                          *
2068                          * Ultimately, I suspect cfg80211 should print the
2069                          * messages instead.
2070                          */
2071                         printk(KERN_DEBUG
2072                                "%s: deauthenticated from %pM (Reason: %u)\n",
2073                                sdata->name, mgmt->bssid,
2074                                le16_to_cpu(mgmt->u.deauth.reason_code));
2075
2076                         list_del_rcu(&wk->list);
2077                         free_work(wk);
2078                         break;
2079                 }
2080                 mutex_unlock(&local->mtx);
2081
2082                 cfg80211_send_deauth(sdata->dev, (u8 *)mgmt, skb->len);
2083         }
2084 }
2085
2086 static void ieee80211_sta_timer(unsigned long data)
2087 {
2088         struct ieee80211_sub_if_data *sdata =
2089                 (struct ieee80211_sub_if_data *) data;
2090         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2091         struct ieee80211_local *local = sdata->local;
2092
2093         if (local->quiescing) {
2094                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2095                 return;
2096         }
2097
2098         ieee80211_queue_work(&local->hw, &sdata->work);
2099 }
2100
2101 static void ieee80211_sta_connection_lost(struct ieee80211_sub_if_data *sdata,
2102                                           u8 *bssid, u8 reason)
2103 {
2104         struct ieee80211_local *local = sdata->local;
2105         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2106
2107         ifmgd->flags &= ~(IEEE80211_STA_CONNECTION_POLL |
2108                           IEEE80211_STA_BEACON_POLL);
2109
2110         ieee80211_set_disassoc(sdata, true, true);
2111         mutex_unlock(&ifmgd->mtx);
2112         mutex_lock(&local->mtx);
2113         ieee80211_recalc_idle(local);
2114         mutex_unlock(&local->mtx);
2115         /*
2116          * must be outside lock due to cfg80211,
2117          * but that's not a problem.
2118          */
2119         ieee80211_send_deauth_disassoc(sdata, bssid,
2120                         IEEE80211_STYPE_DEAUTH, reason,
2121                         NULL, true);
2122         mutex_lock(&ifmgd->mtx);
2123 }
2124
2125 void ieee80211_sta_work(struct ieee80211_sub_if_data *sdata)
2126 {
2127         struct ieee80211_local *local = sdata->local;
2128         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2129
2130         /* then process the rest of the work */
2131         mutex_lock(&ifmgd->mtx);
2132
2133         if (ifmgd->flags & (IEEE80211_STA_BEACON_POLL |
2134                             IEEE80211_STA_CONNECTION_POLL) &&
2135             ifmgd->associated) {
2136                 u8 bssid[ETH_ALEN];
2137                 int max_tries;
2138
2139                 memcpy(bssid, ifmgd->associated->bssid, ETH_ALEN);
2140
2141                 if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS)
2142                         max_tries = max_nullfunc_tries;
2143                 else
2144                         max_tries = max_probe_tries;
2145
2146                 /* ACK received for nullfunc probing frame */
2147                 if (!ifmgd->probe_send_count)
2148                         ieee80211_reset_ap_probe(sdata);
2149                 else if (ifmgd->nullfunc_failed) {
2150                         if (ifmgd->probe_send_count < max_tries) {
2151 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2152                                 wiphy_debug(local->hw.wiphy,
2153                                             "%s: No ack for nullfunc frame to"
2154                                             " AP %pM, try %d/%i\n",
2155                                             sdata->name, bssid,
2156                                             ifmgd->probe_send_count, max_tries);
2157 #endif
2158                                 ieee80211_mgd_probe_ap_send(sdata);
2159                         } else {
2160 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2161                                 wiphy_debug(local->hw.wiphy,
2162                                             "%s: No ack for nullfunc frame to"
2163                                             " AP %pM, disconnecting.\n",
2164                                             sdata->name, bssid);
2165 #endif
2166                                 ieee80211_sta_connection_lost(sdata, bssid,
2167                                         WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2168                         }
2169                 } else if (time_is_after_jiffies(ifmgd->probe_timeout))
2170                         run_again(ifmgd, ifmgd->probe_timeout);
2171                 else if (local->hw.flags & IEEE80211_HW_REPORTS_TX_ACK_STATUS) {
2172 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2173                         wiphy_debug(local->hw.wiphy,
2174                                     "%s: Failed to send nullfunc to AP %pM"
2175                                     " after %dms, disconnecting.\n",
2176                                     sdata->name,
2177                                     bssid, probe_wait_ms);
2178 #endif
2179                         ieee80211_sta_connection_lost(sdata, bssid,
2180                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2181                 } else if (ifmgd->probe_send_count < max_tries) {
2182 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2183                         wiphy_debug(local->hw.wiphy,
2184                                     "%s: No probe response from AP %pM"
2185                                     " after %dms, try %d/%i\n",
2186                                     sdata->name,
2187                                     bssid, probe_wait_ms,
2188                                     ifmgd->probe_send_count, max_tries);
2189 #endif
2190                         ieee80211_mgd_probe_ap_send(sdata);
2191                 } else {
2192                         /*
2193                          * We actually lost the connection ... or did we?
2194                          * Let's make sure!
2195                          */
2196                         wiphy_debug(local->hw.wiphy,
2197                                     "%s: No probe response from AP %pM"
2198                                     " after %dms, disconnecting.\n",
2199                                     sdata->name,
2200                                     bssid, probe_wait_ms);
2201
2202                         ieee80211_sta_connection_lost(sdata, bssid,
2203                                 WLAN_REASON_DISASSOC_DUE_TO_INACTIVITY);
2204                 }
2205         }
2206
2207         mutex_unlock(&ifmgd->mtx);
2208 }
2209
2210 static void ieee80211_sta_bcn_mon_timer(unsigned long data)
2211 {
2212         struct ieee80211_sub_if_data *sdata =
2213                 (struct ieee80211_sub_if_data *) data;
2214         struct ieee80211_local *local = sdata->local;
2215
2216         if (local->quiescing)
2217                 return;
2218
2219         ieee80211_queue_work(&sdata->local->hw,
2220                              &sdata->u.mgd.beacon_connection_loss_work);
2221 }
2222
2223 static void ieee80211_sta_conn_mon_timer(unsigned long data)
2224 {
2225         struct ieee80211_sub_if_data *sdata =
2226                 (struct ieee80211_sub_if_data *) data;
2227         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2228         struct ieee80211_local *local = sdata->local;
2229
2230         if (local->quiescing)
2231                 return;
2232
2233         ieee80211_queue_work(&local->hw, &ifmgd->monitor_work);
2234 }
2235
2236 static void ieee80211_sta_monitor_work(struct work_struct *work)
2237 {
2238         struct ieee80211_sub_if_data *sdata =
2239                 container_of(work, struct ieee80211_sub_if_data,
2240                              u.mgd.monitor_work);
2241
2242         ieee80211_mgd_probe_ap(sdata, false);
2243 }
2244
2245 static void ieee80211_restart_sta_timer(struct ieee80211_sub_if_data *sdata)
2246 {
2247         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
2248                 sdata->u.mgd.flags &= ~(IEEE80211_STA_BEACON_POLL |
2249                                         IEEE80211_STA_CONNECTION_POLL);
2250
2251                 /* let's probe the connection once */
2252                 ieee80211_queue_work(&sdata->local->hw,
2253                            &sdata->u.mgd.monitor_work);
2254                 /* and do all the other regular work too */
2255                 ieee80211_queue_work(&sdata->local->hw, &sdata->work);
2256         }
2257 }
2258
2259 #ifdef CONFIG_PM
2260 void ieee80211_sta_quiesce(struct ieee80211_sub_if_data *sdata)
2261 {
2262         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2263
2264         /*
2265          * we need to use atomic bitops for the running bits
2266          * only because both timers might fire at the same
2267          * time -- the code here is properly synchronised.
2268          */
2269
2270         cancel_work_sync(&ifmgd->request_smps_work);
2271
2272         cancel_work_sync(&ifmgd->beacon_connection_loss_work);
2273         if (del_timer_sync(&ifmgd->timer))
2274                 set_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running);
2275
2276         cancel_work_sync(&ifmgd->chswitch_work);
2277         if (del_timer_sync(&ifmgd->chswitch_timer))
2278                 set_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running);
2279
2280         cancel_work_sync(&ifmgd->monitor_work);
2281         /* these will just be re-established on connection */
2282         del_timer_sync(&ifmgd->conn_mon_timer);
2283         del_timer_sync(&ifmgd->bcn_mon_timer);
2284 }
2285
2286 void ieee80211_sta_restart(struct ieee80211_sub_if_data *sdata)
2287 {
2288         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2289
2290         if (!ifmgd->associated)
2291                 return;
2292
2293         if (sdata->flags & IEEE80211_SDATA_DISCONNECT_RESUME) {
2294                 sdata->flags &= ~IEEE80211_SDATA_DISCONNECT_RESUME;
2295                 mutex_lock(&ifmgd->mtx);
2296                 if (ifmgd->associated) {
2297 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
2298                         wiphy_debug(sdata->local->hw.wiphy,
2299                                     "%s: driver requested disconnect after resume.\n",
2300                                     sdata->name);
2301 #endif
2302                         ieee80211_sta_connection_lost(sdata,
2303                                 ifmgd->associated->bssid,
2304                                 WLAN_REASON_UNSPECIFIED);
2305                         mutex_unlock(&ifmgd->mtx);
2306                         return;
2307                 }
2308                 mutex_unlock(&ifmgd->mtx);
2309         }
2310
2311         if (test_and_clear_bit(TMR_RUNNING_TIMER, &ifmgd->timers_running))
2312                 add_timer(&ifmgd->timer);
2313         if (test_and_clear_bit(TMR_RUNNING_CHANSW, &ifmgd->timers_running))
2314                 add_timer(&ifmgd->chswitch_timer);
2315         ieee80211_sta_reset_beacon_monitor(sdata);
2316         ieee80211_restart_sta_timer(sdata);
2317         ieee80211_queue_work(&sdata->local->hw, &sdata->u.mgd.monitor_work);
2318 }
2319 #endif
2320
2321 /* interface setup */
2322 void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata)
2323 {
2324         struct ieee80211_if_managed *ifmgd;
2325
2326         ifmgd = &sdata->u.mgd;
2327         INIT_WORK(&ifmgd->monitor_work, ieee80211_sta_monitor_work);
2328         INIT_WORK(&ifmgd->chswitch_work, ieee80211_chswitch_work);
2329         INIT_WORK(&ifmgd->beacon_connection_loss_work,
2330                   ieee80211_beacon_connection_loss_work);
2331         INIT_WORK(&ifmgd->request_smps_work, ieee80211_request_smps_work);
2332         setup_timer(&ifmgd->timer, ieee80211_sta_timer,
2333                     (unsigned long) sdata);
2334         setup_timer(&ifmgd->bcn_mon_timer, ieee80211_sta_bcn_mon_timer,
2335                     (unsigned long) sdata);
2336         setup_timer(&ifmgd->conn_mon_timer, ieee80211_sta_conn_mon_timer,
2337                     (unsigned long) sdata);
2338         setup_timer(&ifmgd->chswitch_timer, ieee80211_chswitch_timer,
2339                     (unsigned long) sdata);
2340
2341         ifmgd->flags = 0;
2342
2343         mutex_init(&ifmgd->mtx);
2344
2345         if (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_DYNAMIC_SMPS)
2346                 ifmgd->req_smps = IEEE80211_SMPS_AUTOMATIC;
2347         else
2348                 ifmgd->req_smps = IEEE80211_SMPS_OFF;
2349 }
2350
2351 /* scan finished notification */
2352 void ieee80211_mlme_notify_scan_completed(struct ieee80211_local *local)
2353 {
2354         struct ieee80211_sub_if_data *sdata = local->scan_sdata;
2355
2356         /* Restart STA timers */
2357         rcu_read_lock();
2358         list_for_each_entry_rcu(sdata, &local->interfaces, list)
2359                 ieee80211_restart_sta_timer(sdata);
2360         rcu_read_unlock();
2361 }
2362
2363 int ieee80211_max_network_latency(struct notifier_block *nb,
2364                                   unsigned long data, void *dummy)
2365 {
2366         s32 latency_usec = (s32) data;
2367         struct ieee80211_local *local =
2368                 container_of(nb, struct ieee80211_local,
2369                              network_latency_notifier);
2370
2371         mutex_lock(&local->iflist_mtx);
2372         ieee80211_recalc_ps(local, latency_usec);
2373         mutex_unlock(&local->iflist_mtx);
2374
2375         return 0;
2376 }
2377
2378 /* config hooks */
2379 static enum work_done_result
2380 ieee80211_probe_auth_done(struct ieee80211_work *wk,
2381                           struct sk_buff *skb)
2382 {
2383         struct ieee80211_local *local = wk->sdata->local;
2384
2385         if (!skb) {
2386                 cfg80211_send_auth_timeout(wk->sdata->dev, wk->filter_ta);
2387                 goto destroy;
2388         }
2389
2390         if (wk->type == IEEE80211_WORK_AUTH) {
2391                 cfg80211_send_rx_auth(wk->sdata->dev, skb->data, skb->len);
2392                 goto destroy;
2393         }
2394
2395         mutex_lock(&wk->sdata->u.mgd.mtx);
2396         ieee80211_rx_mgmt_probe_resp(wk->sdata, skb);
2397         mutex_unlock(&wk->sdata->u.mgd.mtx);
2398
2399         wk->type = IEEE80211_WORK_AUTH;
2400         wk->probe_auth.tries = 0;
2401         return WORK_DONE_REQUEUE;
2402  destroy:
2403         if (wk->probe_auth.synced)
2404                 drv_finish_tx_sync(local, wk->sdata, wk->filter_ta,
2405                                    IEEE80211_TX_SYNC_AUTH);
2406
2407         return WORK_DONE_DESTROY;
2408 }
2409
2410 int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata,
2411                        struct cfg80211_auth_request *req)
2412 {
2413         const u8 *ssid;
2414         struct ieee80211_work *wk;
2415         u16 auth_alg;
2416
2417         if (req->local_state_change)
2418                 return 0; /* no need to update mac80211 state */
2419
2420         switch (req->auth_type) {
2421         case NL80211_AUTHTYPE_OPEN_SYSTEM:
2422                 auth_alg = WLAN_AUTH_OPEN;
2423                 break;
2424         case NL80211_AUTHTYPE_SHARED_KEY:
2425                 if (IS_ERR(sdata->local->wep_tx_tfm))
2426                         return -EOPNOTSUPP;
2427                 auth_alg = WLAN_AUTH_SHARED_KEY;
2428                 break;
2429         case NL80211_AUTHTYPE_FT:
2430                 auth_alg = WLAN_AUTH_FT;
2431                 break;
2432         case NL80211_AUTHTYPE_NETWORK_EAP:
2433                 auth_alg = WLAN_AUTH_LEAP;
2434                 break;
2435         default:
2436                 return -EOPNOTSUPP;
2437         }
2438
2439         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2440         if (!wk)
2441                 return -ENOMEM;
2442
2443         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2444
2445         if (req->ie && req->ie_len) {
2446                 memcpy(wk->ie, req->ie, req->ie_len);
2447                 wk->ie_len = req->ie_len;
2448         }
2449
2450         if (req->key && req->key_len) {
2451                 wk->probe_auth.key_len = req->key_len;
2452                 wk->probe_auth.key_idx = req->key_idx;
2453                 memcpy(wk->probe_auth.key, req->key, req->key_len);
2454         }
2455
2456         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2457         memcpy(wk->probe_auth.ssid, ssid + 2, ssid[1]);
2458         wk->probe_auth.ssid_len = ssid[1];
2459
2460         wk->probe_auth.algorithm = auth_alg;
2461         wk->probe_auth.privacy = req->bss->capability & WLAN_CAPABILITY_PRIVACY;
2462
2463         /* if we already have a probe, don't probe again */
2464         if (req->bss->proberesp_ies)
2465                 wk->type = IEEE80211_WORK_AUTH;
2466         else
2467                 wk->type = IEEE80211_WORK_DIRECT_PROBE;
2468         wk->chan = req->bss->channel;
2469         wk->chan_type = NL80211_CHAN_NO_HT;
2470         wk->sdata = sdata;
2471         wk->done = ieee80211_probe_auth_done;
2472
2473         ieee80211_add_work(wk);
2474         return 0;
2475 }
2476
2477 /* create and insert a dummy station entry */
2478 static int ieee80211_pre_assoc(struct ieee80211_sub_if_data *sdata,
2479                                 u8 *bssid) {
2480         struct sta_info *sta;
2481         int err;
2482
2483         sta = sta_info_alloc(sdata, bssid, GFP_KERNEL);
2484         if (!sta)
2485                 return -ENOMEM;
2486
2487         sta->dummy = true;
2488
2489         err = sta_info_insert(sta);
2490         sta = NULL;
2491         if (err) {
2492                 printk(KERN_DEBUG "%s: failed to insert Dummy STA entry for"
2493                        " the AP (error %d)\n", sdata->name, err);
2494                 return err;
2495         }
2496
2497         return 0;
2498 }
2499
2500 static enum work_done_result ieee80211_assoc_done(struct ieee80211_work *wk,
2501                                                   struct sk_buff *skb)
2502 {
2503         struct ieee80211_local *local = wk->sdata->local;
2504         struct ieee80211_mgmt *mgmt;
2505         struct ieee80211_rx_status *rx_status;
2506         struct ieee802_11_elems elems;
2507         struct cfg80211_bss *cbss = wk->assoc.bss;
2508         u16 status;
2509
2510         if (!skb) {
2511                 sta_info_destroy_addr(wk->sdata, cbss->bssid);
2512                 cfg80211_send_assoc_timeout(wk->sdata->dev, wk->filter_ta);
2513                 goto destroy;
2514         }
2515
2516         if (wk->type == IEEE80211_WORK_ASSOC_BEACON_WAIT) {
2517                 mutex_lock(&wk->sdata->u.mgd.mtx);
2518                 rx_status = (void *) skb->cb;
2519                 ieee802_11_parse_elems(skb->data + 24 + 12, skb->len - 24 - 12, &elems);
2520                 ieee80211_rx_bss_info(wk->sdata, (void *)skb->data, skb->len, rx_status,
2521                                       &elems, true);
2522                 mutex_unlock(&wk->sdata->u.mgd.mtx);
2523
2524                 wk->type = IEEE80211_WORK_ASSOC;
2525                 /* not really done yet */
2526                 return WORK_DONE_REQUEUE;
2527         }
2528
2529         mgmt = (void *)skb->data;
2530         status = le16_to_cpu(mgmt->u.assoc_resp.status_code);
2531
2532         if (status == WLAN_STATUS_SUCCESS) {
2533                 if (wk->assoc.synced)
2534                         drv_finish_tx_sync(local, wk->sdata, wk->filter_ta,
2535                                            IEEE80211_TX_SYNC_ASSOC);
2536
2537                 mutex_lock(&wk->sdata->u.mgd.mtx);
2538                 if (!ieee80211_assoc_success(wk, mgmt, skb->len)) {
2539                         mutex_unlock(&wk->sdata->u.mgd.mtx);
2540                         /* oops -- internal error -- send timeout for now */
2541                         sta_info_destroy_addr(wk->sdata, cbss->bssid);
2542                         cfg80211_send_assoc_timeout(wk->sdata->dev,
2543                                                     wk->filter_ta);
2544                         return WORK_DONE_DESTROY;
2545                 }
2546
2547                 mutex_unlock(&wk->sdata->u.mgd.mtx);
2548         } else {
2549                 /* assoc failed - destroy the dummy station entry */
2550                 sta_info_destroy_addr(wk->sdata, cbss->bssid);
2551         }
2552
2553         cfg80211_send_rx_assoc(wk->sdata->dev, skb->data, skb->len);
2554  destroy:
2555         if (wk->assoc.synced)
2556                 drv_finish_tx_sync(local, wk->sdata, wk->filter_ta,
2557                                    IEEE80211_TX_SYNC_ASSOC);
2558
2559         return WORK_DONE_DESTROY;
2560 }
2561
2562 int ieee80211_mgd_assoc(struct ieee80211_sub_if_data *sdata,
2563                         struct cfg80211_assoc_request *req)
2564 {
2565         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2566         struct ieee80211_bss *bss = (void *)req->bss->priv;
2567         struct ieee80211_work *wk;
2568         const u8 *ssid;
2569         int i, err;
2570
2571         mutex_lock(&ifmgd->mtx);
2572         if (ifmgd->associated) {
2573                 if (!req->prev_bssid ||
2574                     memcmp(req->prev_bssid, ifmgd->associated->bssid,
2575                            ETH_ALEN)) {
2576                         /*
2577                          * We are already associated and the request was not a
2578                          * reassociation request from the current BSS, so
2579                          * reject it.
2580                          */
2581                         mutex_unlock(&ifmgd->mtx);
2582                         return -EALREADY;
2583                 }
2584
2585                 /* Trying to reassociate - clear previous association state */
2586                 ieee80211_set_disassoc(sdata, true, false);
2587         }
2588         mutex_unlock(&ifmgd->mtx);
2589
2590         wk = kzalloc(sizeof(*wk) + req->ie_len, GFP_KERNEL);
2591         if (!wk)
2592                 return -ENOMEM;
2593
2594         /*
2595          * create a dummy station info entry in order
2596          * to start accepting incoming EAPOL packets from the station
2597          */
2598         err = ieee80211_pre_assoc(sdata, req->bss->bssid);
2599         if (err) {
2600                 kfree(wk);
2601                 return err;
2602         }
2603
2604         ifmgd->flags &= ~IEEE80211_STA_DISABLE_11N;
2605         ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
2606
2607         ifmgd->beacon_crc_valid = false;
2608
2609         for (i = 0; i < req->crypto.n_ciphers_pairwise; i++)
2610                 if (req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP40 ||
2611                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_TKIP ||
2612                     req->crypto.ciphers_pairwise[i] == WLAN_CIPHER_SUITE_WEP104)
2613                         ifmgd->flags |= IEEE80211_STA_DISABLE_11N;
2614
2615
2616         if (req->ie && req->ie_len) {
2617                 memcpy(wk->ie, req->ie, req->ie_len);
2618                 wk->ie_len = req->ie_len;
2619         } else
2620                 wk->ie_len = 0;
2621
2622         wk->assoc.bss = req->bss;
2623
2624         memcpy(wk->filter_ta, req->bss->bssid, ETH_ALEN);
2625
2626         /* new association always uses requested smps mode */
2627         if (ifmgd->req_smps == IEEE80211_SMPS_AUTOMATIC) {
2628                 if (ifmgd->powersave)
2629                         ifmgd->ap_smps = IEEE80211_SMPS_DYNAMIC;
2630                 else
2631                         ifmgd->ap_smps = IEEE80211_SMPS_OFF;
2632         } else
2633                 ifmgd->ap_smps = ifmgd->req_smps;
2634
2635         wk->assoc.smps = ifmgd->ap_smps;
2636         /*
2637          * IEEE802.11n does not allow TKIP/WEP as pairwise ciphers in HT mode.
2638          * We still associate in non-HT mode (11a/b/g) if any one of these
2639          * ciphers is configured as pairwise.
2640          * We can set this to true for non-11n hardware, that'll be checked
2641          * separately along with the peer capabilities.
2642          */
2643         wk->assoc.use_11n = !(ifmgd->flags & IEEE80211_STA_DISABLE_11N);
2644         wk->assoc.capability = req->bss->capability;
2645         wk->assoc.wmm_used = bss->wmm_used;
2646         wk->assoc.supp_rates = bss->supp_rates;
2647         wk->assoc.supp_rates_len = bss->supp_rates_len;
2648         wk->assoc.ht_information_ie =
2649                 ieee80211_bss_get_ie(req->bss, WLAN_EID_HT_INFORMATION);
2650
2651         if (bss->wmm_used && bss->uapsd_supported &&
2652             (sdata->local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)) {
2653                 wk->assoc.uapsd_used = true;
2654                 ifmgd->flags |= IEEE80211_STA_UAPSD_ENABLED;
2655         } else {
2656                 wk->assoc.uapsd_used = false;
2657                 ifmgd->flags &= ~IEEE80211_STA_UAPSD_ENABLED;
2658         }
2659
2660         ssid = ieee80211_bss_get_ie(req->bss, WLAN_EID_SSID);
2661         memcpy(wk->assoc.ssid, ssid + 2, ssid[1]);
2662         wk->assoc.ssid_len = ssid[1];
2663
2664         if (req->prev_bssid)
2665                 memcpy(wk->assoc.prev_bssid, req->prev_bssid, ETH_ALEN);
2666
2667         wk->chan = req->bss->channel;
2668         wk->chan_type = NL80211_CHAN_NO_HT;
2669         wk->sdata = sdata;
2670         wk->done = ieee80211_assoc_done;
2671         if (!bss->dtim_period &&
2672             sdata->local->hw.flags & IEEE80211_HW_NEED_DTIM_PERIOD)
2673                 wk->type = IEEE80211_WORK_ASSOC_BEACON_WAIT;
2674         else
2675                 wk->type = IEEE80211_WORK_ASSOC;
2676
2677         if (req->use_mfp) {
2678                 ifmgd->mfp = IEEE80211_MFP_REQUIRED;
2679                 ifmgd->flags |= IEEE80211_STA_MFP_ENABLED;
2680         } else {
2681                 ifmgd->mfp = IEEE80211_MFP_DISABLED;
2682                 ifmgd->flags &= ~IEEE80211_STA_MFP_ENABLED;
2683         }
2684
2685         if (req->crypto.control_port)
2686                 ifmgd->flags |= IEEE80211_STA_CONTROL_PORT;
2687         else
2688                 ifmgd->flags &= ~IEEE80211_STA_CONTROL_PORT;
2689
2690         sdata->control_port_protocol = req->crypto.control_port_ethertype;
2691         sdata->control_port_no_encrypt = req->crypto.control_port_no_encrypt;
2692
2693         ieee80211_add_work(wk);
2694         return 0;
2695 }
2696
2697 int ieee80211_mgd_deauth(struct ieee80211_sub_if_data *sdata,
2698                          struct cfg80211_deauth_request *req,
2699                          void *cookie)
2700 {
2701         struct ieee80211_local *local = sdata->local;
2702         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2703         struct ieee80211_work *wk;
2704         u8 bssid[ETH_ALEN];
2705         bool assoc_bss = false;
2706
2707         mutex_lock(&ifmgd->mtx);
2708
2709         memcpy(bssid, req->bss->bssid, ETH_ALEN);
2710         if (ifmgd->associated == req->bss) {
2711                 ieee80211_set_disassoc(sdata, false, true);
2712                 mutex_unlock(&ifmgd->mtx);
2713                 assoc_bss = true;
2714         } else {
2715                 bool not_auth_yet = false;
2716
2717                 mutex_unlock(&ifmgd->mtx);
2718
2719                 mutex_lock(&local->mtx);
2720                 list_for_each_entry(wk, &local->work_list, list) {
2721                         if (wk->sdata != sdata)
2722                                 continue;
2723
2724                         if (wk->type != IEEE80211_WORK_DIRECT_PROBE &&
2725                             wk->type != IEEE80211_WORK_AUTH &&
2726                             wk->type != IEEE80211_WORK_ASSOC &&
2727                             wk->type != IEEE80211_WORK_ASSOC_BEACON_WAIT)
2728                                 continue;
2729
2730                         if (memcmp(req->bss->bssid, wk->filter_ta, ETH_ALEN))
2731                                 continue;
2732
2733                         not_auth_yet = wk->type == IEEE80211_WORK_DIRECT_PROBE;
2734                         list_del_rcu(&wk->list);
2735                         free_work(wk);
2736                         break;
2737                 }
2738                 mutex_unlock(&local->mtx);
2739
2740                 /*
2741                  * If somebody requests authentication and we haven't
2742                  * sent out an auth frame yet there's no need to send
2743                  * out a deauth frame either. If the state was PROBE,
2744                  * then this is the case. If it's AUTH we have sent a
2745                  * frame, and if it's IDLE we have completed the auth
2746                  * process already.
2747                  */
2748                 if (not_auth_yet) {
2749                         __cfg80211_auth_canceled(sdata->dev, bssid);
2750                         return 0;
2751                 }
2752         }
2753
2754         printk(KERN_DEBUG "%s: deauthenticating from %pM by local choice (reason=%d)\n",
2755                sdata->name, bssid, req->reason_code);
2756
2757         ieee80211_send_deauth_disassoc(sdata, bssid, IEEE80211_STYPE_DEAUTH,
2758                                        req->reason_code, cookie,
2759                                        !req->local_state_change);
2760         if (assoc_bss)
2761                 sta_info_flush(sdata->local, sdata);
2762
2763         mutex_lock(&sdata->local->mtx);
2764         ieee80211_recalc_idle(sdata->local);
2765         mutex_unlock(&sdata->local->mtx);
2766
2767         return 0;
2768 }
2769
2770 int ieee80211_mgd_disassoc(struct ieee80211_sub_if_data *sdata,
2771                            struct cfg80211_disassoc_request *req,
2772                            void *cookie)
2773 {
2774         struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2775         u8 bssid[ETH_ALEN];
2776
2777         mutex_lock(&ifmgd->mtx);
2778
2779         /*
2780          * cfg80211 should catch this ... but it's racy since
2781          * we can receive a disassoc frame, process it, hand it
2782          * to cfg80211 while that's in a locked section already
2783          * trying to tell us that the user wants to disconnect.
2784          */
2785         if (ifmgd->associated != req->bss) {
2786                 mutex_unlock(&ifmgd->mtx);
2787                 return -ENOLINK;
2788         }
2789
2790         printk(KERN_DEBUG "%s: disassociating from %pM by local choice (reason=%d)\n",
2791                sdata->name, req->bss->bssid, req->reason_code);
2792
2793         memcpy(bssid, req->bss->bssid, ETH_ALEN);
2794         ieee80211_set_disassoc(sdata, false, true);
2795
2796         mutex_unlock(&ifmgd->mtx);
2797
2798         ieee80211_send_deauth_disassoc(sdata, req->bss->bssid,
2799                         IEEE80211_STYPE_DISASSOC, req->reason_code,
2800                         cookie, !req->local_state_change);
2801         sta_info_flush(sdata->local, sdata);
2802
2803         mutex_lock(&sdata->local->mtx);
2804         ieee80211_recalc_idle(sdata->local);
2805         mutex_unlock(&sdata->local->mtx);
2806
2807         return 0;
2808 }
2809
2810 void ieee80211_cqm_rssi_notify(struct ieee80211_vif *vif,
2811                                enum nl80211_cqm_rssi_threshold_event rssi_event,
2812                                gfp_t gfp)
2813 {
2814         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2815
2816         trace_api_cqm_rssi_notify(sdata, rssi_event);
2817
2818         cfg80211_cqm_rssi_notify(sdata->dev, rssi_event, gfp);
2819 }
2820 EXPORT_SYMBOL(ieee80211_cqm_rssi_notify);
2821
2822 unsigned char ieee80211_get_operstate(struct ieee80211_vif *vif)
2823 {
2824         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2825         return sdata->dev->operstate;
2826 }
2827 EXPORT_SYMBOL(ieee80211_get_operstate);