ca170b417da670ed5d900accfed5d81a09e94588
[linux-2.6.git] / net / mac80211 / util.c
1 /*
2  * Copyright 2002-2005, Instant802 Networks, Inc.
3  * Copyright 2005-2006, Devicescape Software, Inc.
4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
5  * Copyright 2007       Johannes Berg <johannes@sipsolutions.net>
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License version 2 as
9  * published by the Free Software Foundation.
10  *
11  * utilities for mac80211
12  */
13
14 #include <net/mac80211.h>
15 #include <linux/netdevice.h>
16 #include <linux/types.h>
17 #include <linux/slab.h>
18 #include <linux/skbuff.h>
19 #include <linux/etherdevice.h>
20 #include <linux/if_arp.h>
21 #include <linux/bitmap.h>
22 #include <linux/crc32.h>
23 #include <net/net_namespace.h>
24 #include <net/cfg80211.h>
25 #include <net/rtnetlink.h>
26
27 #include "ieee80211_i.h"
28 #include "driver-ops.h"
29 #include "rate.h"
30 #include "mesh.h"
31 #include "wme.h"
32 #include "led.h"
33 #include "wep.h"
34
35 /* privid for wiphys to determine whether they belong to us or not */
36 void *mac80211_wiphy_privid = &mac80211_wiphy_privid;
37
38 struct ieee80211_hw *wiphy_to_ieee80211_hw(struct wiphy *wiphy)
39 {
40         struct ieee80211_local *local;
41         BUG_ON(!wiphy);
42
43         local = wiphy_priv(wiphy);
44         return &local->hw;
45 }
46 EXPORT_SYMBOL(wiphy_to_ieee80211_hw);
47
48 u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
49                         enum nl80211_iftype type)
50 {
51         __le16 fc = hdr->frame_control;
52
53          /* drop ACK/CTS frames and incorrect hdr len (ctrl) */
54         if (len < 16)
55                 return NULL;
56
57         if (ieee80211_is_data(fc)) {
58                 if (len < 24) /* drop incorrect hdr len (data) */
59                         return NULL;
60
61                 if (ieee80211_has_a4(fc))
62                         return NULL;
63                 if (ieee80211_has_tods(fc))
64                         return hdr->addr1;
65                 if (ieee80211_has_fromds(fc))
66                         return hdr->addr2;
67
68                 return hdr->addr3;
69         }
70
71         if (ieee80211_is_mgmt(fc)) {
72                 if (len < 24) /* drop incorrect hdr len (mgmt) */
73                         return NULL;
74                 return hdr->addr3;
75         }
76
77         if (ieee80211_is_ctl(fc)) {
78                 if(ieee80211_is_pspoll(fc))
79                         return hdr->addr1;
80
81                 if (ieee80211_is_back_req(fc)) {
82                         switch (type) {
83                         case NL80211_IFTYPE_STATION:
84                                 return hdr->addr2;
85                         case NL80211_IFTYPE_AP:
86                         case NL80211_IFTYPE_AP_VLAN:
87                                 return hdr->addr1;
88                         default:
89                                 break; /* fall through to the return */
90                         }
91                 }
92         }
93
94         return NULL;
95 }
96
97 void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
98 {
99         struct sk_buff *skb = tx->skb;
100         struct ieee80211_hdr *hdr;
101
102         do {
103                 hdr = (struct ieee80211_hdr *) skb->data;
104                 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
105         } while ((skb = skb->next));
106 }
107
108 int ieee80211_frame_duration(struct ieee80211_local *local, size_t len,
109                              int rate, int erp, int short_preamble)
110 {
111         int dur;
112
113         /* calculate duration (in microseconds, rounded up to next higher
114          * integer if it includes a fractional microsecond) to send frame of
115          * len bytes (does not include FCS) at the given rate. Duration will
116          * also include SIFS.
117          *
118          * rate is in 100 kbps, so divident is multiplied by 10 in the
119          * DIV_ROUND_UP() operations.
120          */
121
122         if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ || erp) {
123                 /*
124                  * OFDM:
125                  *
126                  * N_DBPS = DATARATE x 4
127                  * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
128                  *      (16 = SIGNAL time, 6 = tail bits)
129                  * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
130                  *
131                  * T_SYM = 4 usec
132                  * 802.11a - 17.5.2: aSIFSTime = 16 usec
133                  * 802.11g - 19.8.4: aSIFSTime = 10 usec +
134                  *      signal ext = 6 usec
135                  */
136                 dur = 16; /* SIFS + signal ext */
137                 dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */
138                 dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */
139                 dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
140                                         4 * rate); /* T_SYM x N_SYM */
141         } else {
142                 /*
143                  * 802.11b or 802.11g with 802.11b compatibility:
144                  * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
145                  * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
146                  *
147                  * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
148                  * aSIFSTime = 10 usec
149                  * aPreambleLength = 144 usec or 72 usec with short preamble
150                  * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
151                  */
152                 dur = 10; /* aSIFSTime = 10 usec */
153                 dur += short_preamble ? (72 + 24) : (144 + 48);
154
155                 dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
156         }
157
158         return dur;
159 }
160
161 /* Exported duration function for driver use */
162 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
163                                         struct ieee80211_vif *vif,
164                                         size_t frame_len,
165                                         struct ieee80211_rate *rate)
166 {
167         struct ieee80211_local *local = hw_to_local(hw);
168         struct ieee80211_sub_if_data *sdata;
169         u16 dur;
170         int erp;
171         bool short_preamble = false;
172
173         erp = 0;
174         if (vif) {
175                 sdata = vif_to_sdata(vif);
176                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
177                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
178                         erp = rate->flags & IEEE80211_RATE_ERP_G;
179         }
180
181         dur = ieee80211_frame_duration(local, frame_len, rate->bitrate, erp,
182                                        short_preamble);
183
184         return cpu_to_le16(dur);
185 }
186 EXPORT_SYMBOL(ieee80211_generic_frame_duration);
187
188 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
189                               struct ieee80211_vif *vif, size_t frame_len,
190                               const struct ieee80211_tx_info *frame_txctl)
191 {
192         struct ieee80211_local *local = hw_to_local(hw);
193         struct ieee80211_rate *rate;
194         struct ieee80211_sub_if_data *sdata;
195         bool short_preamble;
196         int erp;
197         u16 dur;
198         struct ieee80211_supported_band *sband;
199
200         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
201
202         short_preamble = false;
203
204         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
205
206         erp = 0;
207         if (vif) {
208                 sdata = vif_to_sdata(vif);
209                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
210                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
211                         erp = rate->flags & IEEE80211_RATE_ERP_G;
212         }
213
214         /* CTS duration */
215         dur = ieee80211_frame_duration(local, 10, rate->bitrate,
216                                        erp, short_preamble);
217         /* Data frame duration */
218         dur += ieee80211_frame_duration(local, frame_len, rate->bitrate,
219                                         erp, short_preamble);
220         /* ACK duration */
221         dur += ieee80211_frame_duration(local, 10, rate->bitrate,
222                                         erp, short_preamble);
223
224         return cpu_to_le16(dur);
225 }
226 EXPORT_SYMBOL(ieee80211_rts_duration);
227
228 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
229                                     struct ieee80211_vif *vif,
230                                     size_t frame_len,
231                                     const struct ieee80211_tx_info *frame_txctl)
232 {
233         struct ieee80211_local *local = hw_to_local(hw);
234         struct ieee80211_rate *rate;
235         struct ieee80211_sub_if_data *sdata;
236         bool short_preamble;
237         int erp;
238         u16 dur;
239         struct ieee80211_supported_band *sband;
240
241         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
242
243         short_preamble = false;
244
245         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
246         erp = 0;
247         if (vif) {
248                 sdata = vif_to_sdata(vif);
249                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
250                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
251                         erp = rate->flags & IEEE80211_RATE_ERP_G;
252         }
253
254         /* Data frame duration */
255         dur = ieee80211_frame_duration(local, frame_len, rate->bitrate,
256                                        erp, short_preamble);
257         if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
258                 /* ACK duration */
259                 dur += ieee80211_frame_duration(local, 10, rate->bitrate,
260                                                 erp, short_preamble);
261         }
262
263         return cpu_to_le16(dur);
264 }
265 EXPORT_SYMBOL(ieee80211_ctstoself_duration);
266
267 static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
268                                    enum queue_stop_reason reason)
269 {
270         struct ieee80211_local *local = hw_to_local(hw);
271         struct ieee80211_sub_if_data *sdata;
272
273         if (WARN_ON(queue >= hw->queues))
274                 return;
275
276         __clear_bit(reason, &local->queue_stop_reasons[queue]);
277
278         if (local->queue_stop_reasons[queue] != 0)
279                 /* someone still has this queue stopped */
280                 return;
281
282         if (!skb_queue_empty(&local->pending[queue]))
283                 tasklet_schedule(&local->tx_pending_tasklet);
284
285         rcu_read_lock();
286         list_for_each_entry_rcu(sdata, &local->interfaces, list)
287                 netif_tx_wake_queue(netdev_get_tx_queue(sdata->dev, queue));
288         rcu_read_unlock();
289 }
290
291 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
292                                     enum queue_stop_reason reason)
293 {
294         struct ieee80211_local *local = hw_to_local(hw);
295         unsigned long flags;
296
297         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
298         __ieee80211_wake_queue(hw, queue, reason);
299         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
300 }
301
302 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
303 {
304         ieee80211_wake_queue_by_reason(hw, queue,
305                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
306 }
307 EXPORT_SYMBOL(ieee80211_wake_queue);
308
309 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
310                                    enum queue_stop_reason reason)
311 {
312         struct ieee80211_local *local = hw_to_local(hw);
313         struct ieee80211_sub_if_data *sdata;
314
315         if (WARN_ON(queue >= hw->queues))
316                 return;
317
318         __set_bit(reason, &local->queue_stop_reasons[queue]);
319
320         rcu_read_lock();
321         list_for_each_entry_rcu(sdata, &local->interfaces, list)
322                 netif_tx_stop_queue(netdev_get_tx_queue(sdata->dev, queue));
323         rcu_read_unlock();
324 }
325
326 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
327                                     enum queue_stop_reason reason)
328 {
329         struct ieee80211_local *local = hw_to_local(hw);
330         unsigned long flags;
331
332         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
333         __ieee80211_stop_queue(hw, queue, reason);
334         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
335 }
336
337 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
338 {
339         ieee80211_stop_queue_by_reason(hw, queue,
340                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
341 }
342 EXPORT_SYMBOL(ieee80211_stop_queue);
343
344 void ieee80211_add_pending_skb(struct ieee80211_local *local,
345                                struct sk_buff *skb)
346 {
347         struct ieee80211_hw *hw = &local->hw;
348         unsigned long flags;
349         int queue = skb_get_queue_mapping(skb);
350         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
351
352         if (WARN_ON(!info->control.vif)) {
353                 kfree_skb(skb);
354                 return;
355         }
356
357         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
358         __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
359         __skb_queue_tail(&local->pending[queue], skb);
360         __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
361         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
362 }
363
364 int ieee80211_add_pending_skbs(struct ieee80211_local *local,
365                                struct sk_buff_head *skbs)
366 {
367         struct ieee80211_hw *hw = &local->hw;
368         struct sk_buff *skb;
369         unsigned long flags;
370         int queue, ret = 0, i;
371
372         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
373         for (i = 0; i < hw->queues; i++)
374                 __ieee80211_stop_queue(hw, i,
375                         IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
376
377         while ((skb = skb_dequeue(skbs))) {
378                 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
379
380                 if (WARN_ON(!info->control.vif)) {
381                         kfree_skb(skb);
382                         continue;
383                 }
384
385                 ret++;
386                 queue = skb_get_queue_mapping(skb);
387                 __skb_queue_tail(&local->pending[queue], skb);
388         }
389
390         for (i = 0; i < hw->queues; i++)
391                 __ieee80211_wake_queue(hw, i,
392                         IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
393         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
394
395         return ret;
396 }
397
398 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
399                                     enum queue_stop_reason reason)
400 {
401         struct ieee80211_local *local = hw_to_local(hw);
402         unsigned long flags;
403         int i;
404
405         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
406
407         for (i = 0; i < hw->queues; i++)
408                 __ieee80211_stop_queue(hw, i, reason);
409
410         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
411 }
412
413 void ieee80211_stop_queues(struct ieee80211_hw *hw)
414 {
415         ieee80211_stop_queues_by_reason(hw,
416                                         IEEE80211_QUEUE_STOP_REASON_DRIVER);
417 }
418 EXPORT_SYMBOL(ieee80211_stop_queues);
419
420 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
421 {
422         struct ieee80211_local *local = hw_to_local(hw);
423         unsigned long flags;
424         int ret;
425
426         if (WARN_ON(queue >= hw->queues))
427                 return true;
428
429         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
430         ret = !!local->queue_stop_reasons[queue];
431         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
432         return ret;
433 }
434 EXPORT_SYMBOL(ieee80211_queue_stopped);
435
436 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
437                                      enum queue_stop_reason reason)
438 {
439         struct ieee80211_local *local = hw_to_local(hw);
440         unsigned long flags;
441         int i;
442
443         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
444
445         for (i = 0; i < hw->queues; i++)
446                 __ieee80211_wake_queue(hw, i, reason);
447
448         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
449 }
450
451 void ieee80211_wake_queues(struct ieee80211_hw *hw)
452 {
453         ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
454 }
455 EXPORT_SYMBOL(ieee80211_wake_queues);
456
457 void ieee80211_iterate_active_interfaces(
458         struct ieee80211_hw *hw,
459         void (*iterator)(void *data, u8 *mac,
460                          struct ieee80211_vif *vif),
461         void *data)
462 {
463         struct ieee80211_local *local = hw_to_local(hw);
464         struct ieee80211_sub_if_data *sdata;
465
466         mutex_lock(&local->iflist_mtx);
467
468         list_for_each_entry(sdata, &local->interfaces, list) {
469                 switch (sdata->vif.type) {
470                 case __NL80211_IFTYPE_AFTER_LAST:
471                 case NL80211_IFTYPE_UNSPECIFIED:
472                 case NL80211_IFTYPE_MONITOR:
473                 case NL80211_IFTYPE_AP_VLAN:
474                         continue;
475                 case NL80211_IFTYPE_AP:
476                 case NL80211_IFTYPE_STATION:
477                 case NL80211_IFTYPE_ADHOC:
478                 case NL80211_IFTYPE_WDS:
479                 case NL80211_IFTYPE_MESH_POINT:
480                         break;
481                 }
482                 if (ieee80211_sdata_running(sdata))
483                         iterator(data, sdata->vif.addr,
484                                  &sdata->vif);
485         }
486
487         mutex_unlock(&local->iflist_mtx);
488 }
489 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
490
491 void ieee80211_iterate_active_interfaces_atomic(
492         struct ieee80211_hw *hw,
493         void (*iterator)(void *data, u8 *mac,
494                          struct ieee80211_vif *vif),
495         void *data)
496 {
497         struct ieee80211_local *local = hw_to_local(hw);
498         struct ieee80211_sub_if_data *sdata;
499
500         rcu_read_lock();
501
502         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
503                 switch (sdata->vif.type) {
504                 case __NL80211_IFTYPE_AFTER_LAST:
505                 case NL80211_IFTYPE_UNSPECIFIED:
506                 case NL80211_IFTYPE_MONITOR:
507                 case NL80211_IFTYPE_AP_VLAN:
508                         continue;
509                 case NL80211_IFTYPE_AP:
510                 case NL80211_IFTYPE_STATION:
511                 case NL80211_IFTYPE_ADHOC:
512                 case NL80211_IFTYPE_WDS:
513                 case NL80211_IFTYPE_MESH_POINT:
514                         break;
515                 }
516                 if (ieee80211_sdata_running(sdata))
517                         iterator(data, sdata->vif.addr,
518                                  &sdata->vif);
519         }
520
521         rcu_read_unlock();
522 }
523 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
524
525 /*
526  * Nothing should have been stuffed into the workqueue during
527  * the suspend->resume cycle. If this WARN is seen then there
528  * is a bug with either the driver suspend or something in
529  * mac80211 stuffing into the workqueue which we haven't yet
530  * cleared during mac80211's suspend cycle.
531  */
532 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
533 {
534         if (WARN(local->suspended && !local->resuming,
535                  "queueing ieee80211 work while going to suspend\n"))
536                 return false;
537
538         return true;
539 }
540
541 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
542 {
543         struct ieee80211_local *local = hw_to_local(hw);
544
545         if (!ieee80211_can_queue_work(local))
546                 return;
547
548         queue_work(local->workqueue, work);
549 }
550 EXPORT_SYMBOL(ieee80211_queue_work);
551
552 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
553                                   struct delayed_work *dwork,
554                                   unsigned long delay)
555 {
556         struct ieee80211_local *local = hw_to_local(hw);
557
558         if (!ieee80211_can_queue_work(local))
559                 return;
560
561         queue_delayed_work(local->workqueue, dwork, delay);
562 }
563 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
564
565 void ieee802_11_parse_elems(u8 *start, size_t len,
566                             struct ieee802_11_elems *elems)
567 {
568         ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
569 }
570
571 u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
572                                struct ieee802_11_elems *elems,
573                                u64 filter, u32 crc)
574 {
575         size_t left = len;
576         u8 *pos = start;
577         bool calc_crc = filter != 0;
578
579         memset(elems, 0, sizeof(*elems));
580         elems->ie_start = start;
581         elems->total_len = len;
582
583         while (left >= 2) {
584                 u8 id, elen;
585
586                 id = *pos++;
587                 elen = *pos++;
588                 left -= 2;
589
590                 if (elen > left)
591                         break;
592
593                 if (calc_crc && id < 64 && (filter & (1ULL << id)))
594                         crc = crc32_be(crc, pos - 2, elen + 2);
595
596                 switch (id) {
597                 case WLAN_EID_SSID:
598                         elems->ssid = pos;
599                         elems->ssid_len = elen;
600                         break;
601                 case WLAN_EID_SUPP_RATES:
602                         elems->supp_rates = pos;
603                         elems->supp_rates_len = elen;
604                         break;
605                 case WLAN_EID_FH_PARAMS:
606                         elems->fh_params = pos;
607                         elems->fh_params_len = elen;
608                         break;
609                 case WLAN_EID_DS_PARAMS:
610                         elems->ds_params = pos;
611                         elems->ds_params_len = elen;
612                         break;
613                 case WLAN_EID_CF_PARAMS:
614                         elems->cf_params = pos;
615                         elems->cf_params_len = elen;
616                         break;
617                 case WLAN_EID_TIM:
618                         if (elen >= sizeof(struct ieee80211_tim_ie)) {
619                                 elems->tim = (void *)pos;
620                                 elems->tim_len = elen;
621                         }
622                         break;
623                 case WLAN_EID_IBSS_PARAMS:
624                         elems->ibss_params = pos;
625                         elems->ibss_params_len = elen;
626                         break;
627                 case WLAN_EID_CHALLENGE:
628                         elems->challenge = pos;
629                         elems->challenge_len = elen;
630                         break;
631                 case WLAN_EID_VENDOR_SPECIFIC:
632                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
633                             pos[2] == 0xf2) {
634                                 /* Microsoft OUI (00:50:F2) */
635
636                                 if (calc_crc)
637                                         crc = crc32_be(crc, pos - 2, elen + 2);
638
639                                 if (pos[3] == 1) {
640                                         /* OUI Type 1 - WPA IE */
641                                         elems->wpa = pos;
642                                         elems->wpa_len = elen;
643                                 } else if (elen >= 5 && pos[3] == 2) {
644                                         /* OUI Type 2 - WMM IE */
645                                         if (pos[4] == 0) {
646                                                 elems->wmm_info = pos;
647                                                 elems->wmm_info_len = elen;
648                                         } else if (pos[4] == 1) {
649                                                 elems->wmm_param = pos;
650                                                 elems->wmm_param_len = elen;
651                                         }
652                                 }
653                         }
654                         break;
655                 case WLAN_EID_RSN:
656                         elems->rsn = pos;
657                         elems->rsn_len = elen;
658                         break;
659                 case WLAN_EID_ERP_INFO:
660                         elems->erp_info = pos;
661                         elems->erp_info_len = elen;
662                         break;
663                 case WLAN_EID_EXT_SUPP_RATES:
664                         elems->ext_supp_rates = pos;
665                         elems->ext_supp_rates_len = elen;
666                         break;
667                 case WLAN_EID_HT_CAPABILITY:
668                         if (elen >= sizeof(struct ieee80211_ht_cap))
669                                 elems->ht_cap_elem = (void *)pos;
670                         break;
671                 case WLAN_EID_HT_INFORMATION:
672                         if (elen >= sizeof(struct ieee80211_ht_info))
673                                 elems->ht_info_elem = (void *)pos;
674                         break;
675                 case WLAN_EID_MESH_ID:
676                         elems->mesh_id = pos;
677                         elems->mesh_id_len = elen;
678                         break;
679                 case WLAN_EID_MESH_CONFIG:
680                         if (elen >= sizeof(struct ieee80211_meshconf_ie))
681                                 elems->mesh_config = (void *)pos;
682                         break;
683                 case WLAN_EID_PEER_LINK:
684                         elems->peer_link = pos;
685                         elems->peer_link_len = elen;
686                         break;
687                 case WLAN_EID_PREQ:
688                         elems->preq = pos;
689                         elems->preq_len = elen;
690                         break;
691                 case WLAN_EID_PREP:
692                         elems->prep = pos;
693                         elems->prep_len = elen;
694                         break;
695                 case WLAN_EID_PERR:
696                         elems->perr = pos;
697                         elems->perr_len = elen;
698                         break;
699                 case WLAN_EID_RANN:
700                         if (elen >= sizeof(struct ieee80211_rann_ie))
701                                 elems->rann = (void *)pos;
702                         break;
703                 case WLAN_EID_CHANNEL_SWITCH:
704                         elems->ch_switch_elem = pos;
705                         elems->ch_switch_elem_len = elen;
706                         break;
707                 case WLAN_EID_QUIET:
708                         if (!elems->quiet_elem) {
709                                 elems->quiet_elem = pos;
710                                 elems->quiet_elem_len = elen;
711                         }
712                         elems->num_of_quiet_elem++;
713                         break;
714                 case WLAN_EID_COUNTRY:
715                         elems->country_elem = pos;
716                         elems->country_elem_len = elen;
717                         break;
718                 case WLAN_EID_PWR_CONSTRAINT:
719                         elems->pwr_constr_elem = pos;
720                         elems->pwr_constr_elem_len = elen;
721                         break;
722                 case WLAN_EID_TIMEOUT_INTERVAL:
723                         elems->timeout_int = pos;
724                         elems->timeout_int_len = elen;
725                         break;
726                 default:
727                         break;
728                 }
729
730                 left -= elen;
731                 pos += elen;
732         }
733
734         return crc;
735 }
736
737 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata)
738 {
739         struct ieee80211_local *local = sdata->local;
740         struct ieee80211_tx_queue_params qparam;
741         int queue;
742         bool use_11b;
743         int aCWmin, aCWmax;
744
745         if (!local->ops->conf_tx)
746                 return;
747
748         memset(&qparam, 0, sizeof(qparam));
749
750         use_11b = (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) &&
751                  !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
752
753         for (queue = 0; queue < local_to_hw(local)->queues; queue++) {
754                 /* Set defaults according to 802.11-2007 Table 7-37 */
755                 aCWmax = 1023;
756                 if (use_11b)
757                         aCWmin = 31;
758                 else
759                         aCWmin = 15;
760
761                 switch (queue) {
762                 case 3: /* AC_BK */
763                         qparam.cw_max = aCWmax;
764                         qparam.cw_min = aCWmin;
765                         qparam.txop = 0;
766                         qparam.aifs = 7;
767                         break;
768                 default: /* never happens but let's not leave undefined */
769                 case 2: /* AC_BE */
770                         qparam.cw_max = aCWmax;
771                         qparam.cw_min = aCWmin;
772                         qparam.txop = 0;
773                         qparam.aifs = 3;
774                         break;
775                 case 1: /* AC_VI */
776                         qparam.cw_max = aCWmin;
777                         qparam.cw_min = (aCWmin + 1) / 2 - 1;
778                         if (use_11b)
779                                 qparam.txop = 6016/32;
780                         else
781                                 qparam.txop = 3008/32;
782                         qparam.aifs = 2;
783                         break;
784                 case 0: /* AC_VO */
785                         qparam.cw_max = (aCWmin + 1) / 2 - 1;
786                         qparam.cw_min = (aCWmin + 1) / 4 - 1;
787                         if (use_11b)
788                                 qparam.txop = 3264/32;
789                         else
790                                 qparam.txop = 1504/32;
791                         qparam.aifs = 2;
792                         break;
793                 }
794
795                 qparam.uapsd = false;
796
797                 drv_conf_tx(local, queue, &qparam);
798         }
799 }
800
801 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
802                                   const size_t supp_rates_len,
803                                   const u8 *supp_rates)
804 {
805         struct ieee80211_local *local = sdata->local;
806         int i, have_higher_than_11mbit = 0;
807
808         /* cf. IEEE 802.11 9.2.12 */
809         for (i = 0; i < supp_rates_len; i++)
810                 if ((supp_rates[i] & 0x7f) * 5 > 110)
811                         have_higher_than_11mbit = 1;
812
813         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
814             have_higher_than_11mbit)
815                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
816         else
817                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
818
819         ieee80211_set_wmm_default(sdata);
820 }
821
822 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
823                               enum ieee80211_band band)
824 {
825         struct ieee80211_supported_band *sband;
826         struct ieee80211_rate *bitrates;
827         u32 mandatory_rates;
828         enum ieee80211_rate_flags mandatory_flag;
829         int i;
830
831         sband = local->hw.wiphy->bands[band];
832         if (!sband) {
833                 WARN_ON(1);
834                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
835         }
836
837         if (band == IEEE80211_BAND_2GHZ)
838                 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
839         else
840                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
841
842         bitrates = sband->bitrates;
843         mandatory_rates = 0;
844         for (i = 0; i < sband->n_bitrates; i++)
845                 if (bitrates[i].flags & mandatory_flag)
846                         mandatory_rates |= BIT(i);
847         return mandatory_rates;
848 }
849
850 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
851                          u16 transaction, u16 auth_alg,
852                          u8 *extra, size_t extra_len, const u8 *bssid,
853                          const u8 *key, u8 key_len, u8 key_idx)
854 {
855         struct ieee80211_local *local = sdata->local;
856         struct sk_buff *skb;
857         struct ieee80211_mgmt *mgmt;
858         int err;
859
860         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
861                             sizeof(*mgmt) + 6 + extra_len);
862         if (!skb) {
863                 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
864                        "frame\n", sdata->name);
865                 return;
866         }
867         skb_reserve(skb, local->hw.extra_tx_headroom);
868
869         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
870         memset(mgmt, 0, 24 + 6);
871         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
872                                           IEEE80211_STYPE_AUTH);
873         memcpy(mgmt->da, bssid, ETH_ALEN);
874         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
875         memcpy(mgmt->bssid, bssid, ETH_ALEN);
876         mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
877         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
878         mgmt->u.auth.status_code = cpu_to_le16(0);
879         if (extra)
880                 memcpy(skb_put(skb, extra_len), extra, extra_len);
881
882         if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
883                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
884                 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
885                 WARN_ON(err);
886         }
887
888         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
889         ieee80211_tx_skb(sdata, skb);
890 }
891
892 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
893                              const u8 *ie, size_t ie_len,
894                              enum ieee80211_band band)
895 {
896         struct ieee80211_supported_band *sband;
897         u8 *pos;
898         size_t offset = 0, noffset;
899         int supp_rates_len, i;
900
901         sband = local->hw.wiphy->bands[band];
902
903         pos = buffer;
904
905         supp_rates_len = min_t(int, sband->n_bitrates, 8);
906
907         *pos++ = WLAN_EID_SUPP_RATES;
908         *pos++ = supp_rates_len;
909
910         for (i = 0; i < supp_rates_len; i++) {
911                 int rate = sband->bitrates[i].bitrate;
912                 *pos++ = (u8) (rate / 5);
913         }
914
915         /* insert "request information" if in custom IEs */
916         if (ie && ie_len) {
917                 static const u8 before_extrates[] = {
918                         WLAN_EID_SSID,
919                         WLAN_EID_SUPP_RATES,
920                         WLAN_EID_REQUEST,
921                 };
922                 noffset = ieee80211_ie_split(ie, ie_len,
923                                              before_extrates,
924                                              ARRAY_SIZE(before_extrates),
925                                              offset);
926                 memcpy(pos, ie + offset, noffset - offset);
927                 pos += noffset - offset;
928                 offset = noffset;
929         }
930
931         if (sband->n_bitrates > i) {
932                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
933                 *pos++ = sband->n_bitrates - i;
934
935                 for (; i < sband->n_bitrates; i++) {
936                         int rate = sband->bitrates[i].bitrate;
937                         *pos++ = (u8) (rate / 5);
938                 }
939         }
940
941         /* insert custom IEs that go before HT */
942         if (ie && ie_len) {
943                 static const u8 before_ht[] = {
944                         WLAN_EID_SSID,
945                         WLAN_EID_SUPP_RATES,
946                         WLAN_EID_REQUEST,
947                         WLAN_EID_EXT_SUPP_RATES,
948                         WLAN_EID_DS_PARAMS,
949                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
950                 };
951                 noffset = ieee80211_ie_split(ie, ie_len,
952                                              before_ht, ARRAY_SIZE(before_ht),
953                                              offset);
954                 memcpy(pos, ie + offset, noffset - offset);
955                 pos += noffset - offset;
956                 offset = noffset;
957         }
958
959         if (sband->ht_cap.ht_supported) {
960                 u16 cap = sband->ht_cap.cap;
961                 __le16 tmp;
962
963                 if (ieee80211_disable_40mhz_24ghz &&
964                     sband->band == IEEE80211_BAND_2GHZ) {
965                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
966                         cap &= ~IEEE80211_HT_CAP_SGI_40;
967                 }
968
969                 *pos++ = WLAN_EID_HT_CAPABILITY;
970                 *pos++ = sizeof(struct ieee80211_ht_cap);
971                 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
972                 tmp = cpu_to_le16(cap);
973                 memcpy(pos, &tmp, sizeof(u16));
974                 pos += sizeof(u16);
975                 *pos++ = sband->ht_cap.ampdu_factor |
976                          (sband->ht_cap.ampdu_density <<
977                                 IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
978                 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
979                 pos += sizeof(sband->ht_cap.mcs);
980                 pos += 2 + 4 + 1; /* ext info, BF cap, antsel */
981         }
982
983         /*
984          * If adding more here, adjust code in main.c
985          * that calculates local->scan_ies_len.
986          */
987
988         /* add any remaining custom IEs */
989         if (ie && ie_len) {
990                 noffset = ie_len;
991                 memcpy(pos, ie + offset, noffset - offset);
992                 pos += noffset - offset;
993         }
994
995         return pos - buffer;
996 }
997
998 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
999                               const u8 *ssid, size_t ssid_len,
1000                               const u8 *ie, size_t ie_len)
1001 {
1002         struct ieee80211_local *local = sdata->local;
1003         struct sk_buff *skb;
1004         struct ieee80211_mgmt *mgmt;
1005         size_t buf_len;
1006         u8 *buf;
1007
1008         /* FIXME: come up with a proper value */
1009         buf = kmalloc(200 + ie_len, GFP_KERNEL);
1010         if (!buf) {
1011                 printk(KERN_DEBUG "%s: failed to allocate temporary IE "
1012                        "buffer\n", sdata->name);
1013                 return;
1014         }
1015
1016         buf_len = ieee80211_build_preq_ies(local, buf, ie, ie_len,
1017                                            local->hw.conf.channel->band);
1018
1019         skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
1020                                      ssid, ssid_len,
1021                                      buf, buf_len);
1022
1023         if (dst) {
1024                 mgmt = (struct ieee80211_mgmt *) skb->data;
1025                 memcpy(mgmt->da, dst, ETH_ALEN);
1026                 memcpy(mgmt->bssid, dst, ETH_ALEN);
1027         }
1028
1029         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1030         ieee80211_tx_skb(sdata, skb);
1031         kfree(buf);
1032 }
1033
1034 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
1035                             struct ieee802_11_elems *elems,
1036                             enum ieee80211_band band)
1037 {
1038         struct ieee80211_supported_band *sband;
1039         struct ieee80211_rate *bitrates;
1040         size_t num_rates;
1041         u32 supp_rates;
1042         int i, j;
1043         sband = local->hw.wiphy->bands[band];
1044
1045         if (!sband) {
1046                 WARN_ON(1);
1047                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1048         }
1049
1050         bitrates = sband->bitrates;
1051         num_rates = sband->n_bitrates;
1052         supp_rates = 0;
1053         for (i = 0; i < elems->supp_rates_len +
1054                      elems->ext_supp_rates_len; i++) {
1055                 u8 rate = 0;
1056                 int own_rate;
1057                 if (i < elems->supp_rates_len)
1058                         rate = elems->supp_rates[i];
1059                 else if (elems->ext_supp_rates)
1060                         rate = elems->ext_supp_rates
1061                                 [i - elems->supp_rates_len];
1062                 own_rate = 5 * (rate & 0x7f);
1063                 for (j = 0; j < num_rates; j++)
1064                         if (bitrates[j].bitrate == own_rate)
1065                                 supp_rates |= BIT(j);
1066         }
1067         return supp_rates;
1068 }
1069
1070 void ieee80211_stop_device(struct ieee80211_local *local)
1071 {
1072         ieee80211_led_radio(local, false);
1073
1074         cancel_work_sync(&local->reconfig_filter);
1075
1076         flush_workqueue(local->workqueue);
1077         drv_stop(local);
1078 }
1079
1080 int ieee80211_reconfig(struct ieee80211_local *local)
1081 {
1082         struct ieee80211_hw *hw = &local->hw;
1083         struct ieee80211_sub_if_data *sdata;
1084         struct sta_info *sta;
1085         unsigned long flags;
1086         int res;
1087
1088         if (local->suspended)
1089                 local->resuming = true;
1090
1091         /* restart hardware */
1092         if (local->open_count) {
1093                 /*
1094                  * Upon resume hardware can sometimes be goofy due to
1095                  * various platform / driver / bus issues, so restarting
1096                  * the device may at times not work immediately. Propagate
1097                  * the error.
1098                  */
1099                 res = drv_start(local);
1100                 if (res) {
1101                         WARN(local->suspended, "Harware became unavailable "
1102                              "upon resume. This is could be a software issue"
1103                              "prior to suspend or a hardware issue\n");
1104                         return res;
1105                 }
1106
1107                 ieee80211_led_radio(local, true);
1108         }
1109
1110         /* add interfaces */
1111         list_for_each_entry(sdata, &local->interfaces, list) {
1112                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1113                     sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1114                     ieee80211_sdata_running(sdata))
1115                         res = drv_add_interface(local, &sdata->vif);
1116         }
1117
1118         /* add STAs back */
1119         if (local->ops->sta_notify) {
1120                 spin_lock_irqsave(&local->sta_lock, flags);
1121                 list_for_each_entry(sta, &local->sta_list, list) {
1122                         sdata = sta->sdata;
1123                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1124                                 sdata = container_of(sdata->bss,
1125                                              struct ieee80211_sub_if_data,
1126                                              u.ap);
1127
1128                         drv_sta_notify(local, sdata, STA_NOTIFY_ADD,
1129                                        &sta->sta);
1130                 }
1131                 spin_unlock_irqrestore(&local->sta_lock, flags);
1132         }
1133
1134         /* Clear Suspend state so that ADDBA requests can be processed */
1135
1136         rcu_read_lock();
1137
1138         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1139                 list_for_each_entry_rcu(sta, &local->sta_list, list) {
1140                         clear_sta_flags(sta, WLAN_STA_SUSPEND);
1141                 }
1142         }
1143
1144         rcu_read_unlock();
1145
1146         /* setup RTS threshold */
1147         drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1148
1149         /* reconfigure hardware */
1150         ieee80211_hw_config(local, ~0);
1151
1152         ieee80211_configure_filter(local);
1153
1154         /* Finally also reconfigure all the BSS information */
1155         list_for_each_entry(sdata, &local->interfaces, list) {
1156                 u32 changed = ~0;
1157                 if (!ieee80211_sdata_running(sdata))
1158                         continue;
1159                 switch (sdata->vif.type) {
1160                 case NL80211_IFTYPE_STATION:
1161                         /* disable beacon change bits */
1162                         changed &= ~(BSS_CHANGED_BEACON |
1163                                      BSS_CHANGED_BEACON_ENABLED);
1164                         /* fall through */
1165                 case NL80211_IFTYPE_ADHOC:
1166                 case NL80211_IFTYPE_AP:
1167                 case NL80211_IFTYPE_MESH_POINT:
1168                         ieee80211_bss_info_change_notify(sdata, changed);
1169                         break;
1170                 case NL80211_IFTYPE_WDS:
1171                         break;
1172                 case NL80211_IFTYPE_AP_VLAN:
1173                 case NL80211_IFTYPE_MONITOR:
1174                         /* ignore virtual */
1175                         break;
1176                 case NL80211_IFTYPE_UNSPECIFIED:
1177                 case __NL80211_IFTYPE_AFTER_LAST:
1178                         WARN_ON(1);
1179                         break;
1180                 }
1181         }
1182
1183         /* add back keys */
1184         list_for_each_entry(sdata, &local->interfaces, list)
1185                 if (ieee80211_sdata_running(sdata))
1186                         ieee80211_enable_keys(sdata);
1187
1188         ieee80211_wake_queues_by_reason(hw,
1189                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1190
1191         /*
1192          * If this is for hw restart things are still running.
1193          * We may want to change that later, however.
1194          */
1195         if (!local->suspended)
1196                 return 0;
1197
1198 #ifdef CONFIG_PM
1199         /* first set suspended false, then resuming */
1200         local->suspended = false;
1201         mb();
1202         local->resuming = false;
1203
1204         list_for_each_entry(sdata, &local->interfaces, list) {
1205                 switch(sdata->vif.type) {
1206                 case NL80211_IFTYPE_STATION:
1207                         ieee80211_sta_restart(sdata);
1208                         break;
1209                 case NL80211_IFTYPE_ADHOC:
1210                         ieee80211_ibss_restart(sdata);
1211                         break;
1212                 case NL80211_IFTYPE_MESH_POINT:
1213                         ieee80211_mesh_restart(sdata);
1214                         break;
1215                 default:
1216                         break;
1217                 }
1218         }
1219
1220         add_timer(&local->sta_cleanup);
1221
1222         spin_lock_irqsave(&local->sta_lock, flags);
1223         list_for_each_entry(sta, &local->sta_list, list)
1224                 mesh_plink_restart(sta);
1225         spin_unlock_irqrestore(&local->sta_lock, flags);
1226 #else
1227         WARN_ON(1);
1228 #endif
1229         return 0;
1230 }
1231
1232 static int check_mgd_smps(struct ieee80211_if_managed *ifmgd,
1233                           enum ieee80211_smps_mode *smps_mode)
1234 {
1235         if (ifmgd->associated) {
1236                 *smps_mode = ifmgd->ap_smps;
1237
1238                 if (*smps_mode == IEEE80211_SMPS_AUTOMATIC) {
1239                         if (ifmgd->powersave)
1240                                 *smps_mode = IEEE80211_SMPS_DYNAMIC;
1241                         else
1242                                 *smps_mode = IEEE80211_SMPS_OFF;
1243                 }
1244
1245                 return 1;
1246         }
1247
1248         return 0;
1249 }
1250
1251 /* must hold iflist_mtx */
1252 void ieee80211_recalc_smps(struct ieee80211_local *local,
1253                            struct ieee80211_sub_if_data *forsdata)
1254 {
1255         struct ieee80211_sub_if_data *sdata;
1256         enum ieee80211_smps_mode smps_mode = IEEE80211_SMPS_OFF;
1257         int count = 0;
1258
1259         if (forsdata)
1260                 WARN_ON(!mutex_is_locked(&forsdata->u.mgd.mtx));
1261
1262         WARN_ON(!mutex_is_locked(&local->iflist_mtx));
1263
1264         /*
1265          * This function could be improved to handle multiple
1266          * interfaces better, but right now it makes any
1267          * non-station interfaces force SM PS to be turned
1268          * off. If there are multiple station interfaces it
1269          * could also use the best possible mode, e.g. if
1270          * one is in static and the other in dynamic then
1271          * dynamic is ok.
1272          */
1273
1274         list_for_each_entry(sdata, &local->interfaces, list) {
1275                 if (!netif_running(sdata->dev))
1276                         continue;
1277                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1278                         goto set;
1279                 if (sdata != forsdata) {
1280                         /*
1281                          * This nested is ok -- we are holding the iflist_mtx
1282                          * so can't get here twice or so. But it's required
1283                          * since normally we acquire it first and then the
1284                          * iflist_mtx.
1285                          */
1286                         mutex_lock_nested(&sdata->u.mgd.mtx, SINGLE_DEPTH_NESTING);
1287                         count += check_mgd_smps(&sdata->u.mgd, &smps_mode);
1288                         mutex_unlock(&sdata->u.mgd.mtx);
1289                 } else
1290                         count += check_mgd_smps(&sdata->u.mgd, &smps_mode);
1291
1292                 if (count > 1) {
1293                         smps_mode = IEEE80211_SMPS_OFF;
1294                         break;
1295                 }
1296         }
1297
1298         if (smps_mode == local->smps_mode)
1299                 return;
1300
1301  set:
1302         local->smps_mode = smps_mode;
1303         /* changed flag is auto-detected for this */
1304         ieee80211_hw_config(local, 0);
1305 }
1306
1307 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1308 {
1309         int i;
1310
1311         for (i = 0; i < n_ids; i++)
1312                 if (ids[i] == id)
1313                         return true;
1314         return false;
1315 }
1316
1317 /**
1318  * ieee80211_ie_split - split an IE buffer according to ordering
1319  *
1320  * @ies: the IE buffer
1321  * @ielen: the length of the IE buffer
1322  * @ids: an array with element IDs that are allowed before
1323  *      the split
1324  * @n_ids: the size of the element ID array
1325  * @offset: offset where to start splitting in the buffer
1326  *
1327  * This function splits an IE buffer by updating the @offset
1328  * variable to point to the location where the buffer should be
1329  * split.
1330  *
1331  * It assumes that the given IE buffer is well-formed, this
1332  * has to be guaranteed by the caller!
1333  *
1334  * It also assumes that the IEs in the buffer are ordered
1335  * correctly, if not the result of using this function will not
1336  * be ordered correctly either, i.e. it does no reordering.
1337  *
1338  * The function returns the offset where the next part of the
1339  * buffer starts, which may be @ielen if the entire (remainder)
1340  * of the buffer should be used.
1341  */
1342 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1343                           const u8 *ids, int n_ids, size_t offset)
1344 {
1345         size_t pos = offset;
1346
1347         while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1348                 pos += 2 + ies[pos + 1];
1349
1350         return pos;
1351 }
1352
1353 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1354 {
1355         size_t pos = offset;
1356
1357         while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1358                 pos += 2 + ies[pos + 1];
1359
1360         return pos;
1361 }