748387d45bc05f8fbab8a579066c7c0771a6cca8
[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         trace_wake_queue(local, queue, reason);
274
275         if (WARN_ON(queue >= hw->queues))
276                 return;
277
278         __clear_bit(reason, &local->queue_stop_reasons[queue]);
279
280         if (local->queue_stop_reasons[queue] != 0)
281                 /* someone still has this queue stopped */
282                 return;
283
284         if (skb_queue_empty(&local->pending[queue])) {
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         } else
290                 tasklet_schedule(&local->tx_pending_tasklet);
291 }
292
293 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
294                                     enum queue_stop_reason reason)
295 {
296         struct ieee80211_local *local = hw_to_local(hw);
297         unsigned long flags;
298
299         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
300         __ieee80211_wake_queue(hw, queue, reason);
301         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
302 }
303
304 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
305 {
306         ieee80211_wake_queue_by_reason(hw, queue,
307                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
308 }
309 EXPORT_SYMBOL(ieee80211_wake_queue);
310
311 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
312                                    enum queue_stop_reason reason)
313 {
314         struct ieee80211_local *local = hw_to_local(hw);
315         struct ieee80211_sub_if_data *sdata;
316
317         trace_stop_queue(local, queue, reason);
318
319         if (WARN_ON(queue >= hw->queues))
320                 return;
321
322         __set_bit(reason, &local->queue_stop_reasons[queue]);
323
324         rcu_read_lock();
325         list_for_each_entry_rcu(sdata, &local->interfaces, list)
326                 netif_tx_stop_queue(netdev_get_tx_queue(sdata->dev, queue));
327         rcu_read_unlock();
328 }
329
330 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
331                                     enum queue_stop_reason reason)
332 {
333         struct ieee80211_local *local = hw_to_local(hw);
334         unsigned long flags;
335
336         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
337         __ieee80211_stop_queue(hw, queue, reason);
338         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
339 }
340
341 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
342 {
343         ieee80211_stop_queue_by_reason(hw, queue,
344                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
345 }
346 EXPORT_SYMBOL(ieee80211_stop_queue);
347
348 void ieee80211_add_pending_skb(struct ieee80211_local *local,
349                                struct sk_buff *skb)
350 {
351         struct ieee80211_hw *hw = &local->hw;
352         unsigned long flags;
353         int queue = skb_get_queue_mapping(skb);
354         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
355
356         if (WARN_ON(!info->control.vif)) {
357                 kfree_skb(skb);
358                 return;
359         }
360
361         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
362         __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
363         __skb_queue_tail(&local->pending[queue], skb);
364         __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
365         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
366 }
367
368 int ieee80211_add_pending_skbs(struct ieee80211_local *local,
369                                struct sk_buff_head *skbs)
370 {
371         struct ieee80211_hw *hw = &local->hw;
372         struct sk_buff *skb;
373         unsigned long flags;
374         int queue, ret = 0, i;
375
376         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
377         for (i = 0; i < hw->queues; i++)
378                 __ieee80211_stop_queue(hw, i,
379                         IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
380
381         while ((skb = skb_dequeue(skbs))) {
382                 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
383
384                 if (WARN_ON(!info->control.vif)) {
385                         kfree_skb(skb);
386                         continue;
387                 }
388
389                 ret++;
390                 queue = skb_get_queue_mapping(skb);
391                 __skb_queue_tail(&local->pending[queue], skb);
392         }
393
394         for (i = 0; i < hw->queues; i++)
395                 __ieee80211_wake_queue(hw, i,
396                         IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
397         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
398
399         return ret;
400 }
401
402 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
403                                     enum queue_stop_reason reason)
404 {
405         struct ieee80211_local *local = hw_to_local(hw);
406         unsigned long flags;
407         int i;
408
409         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
410
411         for (i = 0; i < hw->queues; i++)
412                 __ieee80211_stop_queue(hw, i, reason);
413
414         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
415 }
416
417 void ieee80211_stop_queues(struct ieee80211_hw *hw)
418 {
419         ieee80211_stop_queues_by_reason(hw,
420                                         IEEE80211_QUEUE_STOP_REASON_DRIVER);
421 }
422 EXPORT_SYMBOL(ieee80211_stop_queues);
423
424 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
425 {
426         struct ieee80211_local *local = hw_to_local(hw);
427         unsigned long flags;
428         int ret;
429
430         if (WARN_ON(queue >= hw->queues))
431                 return true;
432
433         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
434         ret = !!local->queue_stop_reasons[queue];
435         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
436         return ret;
437 }
438 EXPORT_SYMBOL(ieee80211_queue_stopped);
439
440 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
441                                      enum queue_stop_reason reason)
442 {
443         struct ieee80211_local *local = hw_to_local(hw);
444         unsigned long flags;
445         int i;
446
447         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
448
449         for (i = 0; i < hw->queues; i++)
450                 __ieee80211_wake_queue(hw, i, reason);
451
452         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
453 }
454
455 void ieee80211_wake_queues(struct ieee80211_hw *hw)
456 {
457         ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
458 }
459 EXPORT_SYMBOL(ieee80211_wake_queues);
460
461 void ieee80211_iterate_active_interfaces(
462         struct ieee80211_hw *hw,
463         void (*iterator)(void *data, u8 *mac,
464                          struct ieee80211_vif *vif),
465         void *data)
466 {
467         struct ieee80211_local *local = hw_to_local(hw);
468         struct ieee80211_sub_if_data *sdata;
469
470         mutex_lock(&local->iflist_mtx);
471
472         list_for_each_entry(sdata, &local->interfaces, list) {
473                 switch (sdata->vif.type) {
474                 case __NL80211_IFTYPE_AFTER_LAST:
475                 case NL80211_IFTYPE_UNSPECIFIED:
476                 case NL80211_IFTYPE_MONITOR:
477                 case NL80211_IFTYPE_AP_VLAN:
478                         continue;
479                 case NL80211_IFTYPE_AP:
480                 case NL80211_IFTYPE_STATION:
481                 case NL80211_IFTYPE_ADHOC:
482                 case NL80211_IFTYPE_WDS:
483                 case NL80211_IFTYPE_MESH_POINT:
484                         break;
485                 }
486                 if (ieee80211_sdata_running(sdata))
487                         iterator(data, sdata->vif.addr,
488                                  &sdata->vif);
489         }
490
491         mutex_unlock(&local->iflist_mtx);
492 }
493 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
494
495 void ieee80211_iterate_active_interfaces_atomic(
496         struct ieee80211_hw *hw,
497         void (*iterator)(void *data, u8 *mac,
498                          struct ieee80211_vif *vif),
499         void *data)
500 {
501         struct ieee80211_local *local = hw_to_local(hw);
502         struct ieee80211_sub_if_data *sdata;
503
504         rcu_read_lock();
505
506         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
507                 switch (sdata->vif.type) {
508                 case __NL80211_IFTYPE_AFTER_LAST:
509                 case NL80211_IFTYPE_UNSPECIFIED:
510                 case NL80211_IFTYPE_MONITOR:
511                 case NL80211_IFTYPE_AP_VLAN:
512                         continue;
513                 case NL80211_IFTYPE_AP:
514                 case NL80211_IFTYPE_STATION:
515                 case NL80211_IFTYPE_ADHOC:
516                 case NL80211_IFTYPE_WDS:
517                 case NL80211_IFTYPE_MESH_POINT:
518                         break;
519                 }
520                 if (ieee80211_sdata_running(sdata))
521                         iterator(data, sdata->vif.addr,
522                                  &sdata->vif);
523         }
524
525         rcu_read_unlock();
526 }
527 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
528
529 /*
530  * Nothing should have been stuffed into the workqueue during
531  * the suspend->resume cycle. If this WARN is seen then there
532  * is a bug with either the driver suspend or something in
533  * mac80211 stuffing into the workqueue which we haven't yet
534  * cleared during mac80211's suspend cycle.
535  */
536 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
537 {
538         if (WARN(local->suspended && !local->resuming,
539                  "queueing ieee80211 work while going to suspend\n"))
540                 return false;
541
542         return true;
543 }
544
545 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
546 {
547         struct ieee80211_local *local = hw_to_local(hw);
548
549         if (!ieee80211_can_queue_work(local))
550                 return;
551
552         queue_work(local->workqueue, work);
553 }
554 EXPORT_SYMBOL(ieee80211_queue_work);
555
556 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
557                                   struct delayed_work *dwork,
558                                   unsigned long delay)
559 {
560         struct ieee80211_local *local = hw_to_local(hw);
561
562         if (!ieee80211_can_queue_work(local))
563                 return;
564
565         queue_delayed_work(local->workqueue, dwork, delay);
566 }
567 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
568
569 void ieee802_11_parse_elems(u8 *start, size_t len,
570                             struct ieee802_11_elems *elems)
571 {
572         ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
573 }
574
575 u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
576                                struct ieee802_11_elems *elems,
577                                u64 filter, u32 crc)
578 {
579         size_t left = len;
580         u8 *pos = start;
581         bool calc_crc = filter != 0;
582
583         memset(elems, 0, sizeof(*elems));
584         elems->ie_start = start;
585         elems->total_len = len;
586
587         while (left >= 2) {
588                 u8 id, elen;
589
590                 id = *pos++;
591                 elen = *pos++;
592                 left -= 2;
593
594                 if (elen > left)
595                         break;
596
597                 if (calc_crc && id < 64 && (filter & (1ULL << id)))
598                         crc = crc32_be(crc, pos - 2, elen + 2);
599
600                 switch (id) {
601                 case WLAN_EID_SSID:
602                         elems->ssid = pos;
603                         elems->ssid_len = elen;
604                         break;
605                 case WLAN_EID_SUPP_RATES:
606                         elems->supp_rates = pos;
607                         elems->supp_rates_len = elen;
608                         break;
609                 case WLAN_EID_FH_PARAMS:
610                         elems->fh_params = pos;
611                         elems->fh_params_len = elen;
612                         break;
613                 case WLAN_EID_DS_PARAMS:
614                         elems->ds_params = pos;
615                         elems->ds_params_len = elen;
616                         break;
617                 case WLAN_EID_CF_PARAMS:
618                         elems->cf_params = pos;
619                         elems->cf_params_len = elen;
620                         break;
621                 case WLAN_EID_TIM:
622                         if (elen >= sizeof(struct ieee80211_tim_ie)) {
623                                 elems->tim = (void *)pos;
624                                 elems->tim_len = elen;
625                         }
626                         break;
627                 case WLAN_EID_IBSS_PARAMS:
628                         elems->ibss_params = pos;
629                         elems->ibss_params_len = elen;
630                         break;
631                 case WLAN_EID_CHALLENGE:
632                         elems->challenge = pos;
633                         elems->challenge_len = elen;
634                         break;
635                 case WLAN_EID_VENDOR_SPECIFIC:
636                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
637                             pos[2] == 0xf2) {
638                                 /* Microsoft OUI (00:50:F2) */
639
640                                 if (calc_crc)
641                                         crc = crc32_be(crc, pos - 2, elen + 2);
642
643                                 if (pos[3] == 1) {
644                                         /* OUI Type 1 - WPA IE */
645                                         elems->wpa = pos;
646                                         elems->wpa_len = elen;
647                                 } else if (elen >= 5 && pos[3] == 2) {
648                                         /* OUI Type 2 - WMM IE */
649                                         if (pos[4] == 0) {
650                                                 elems->wmm_info = pos;
651                                                 elems->wmm_info_len = elen;
652                                         } else if (pos[4] == 1) {
653                                                 elems->wmm_param = pos;
654                                                 elems->wmm_param_len = elen;
655                                         }
656                                 }
657                         }
658                         break;
659                 case WLAN_EID_RSN:
660                         elems->rsn = pos;
661                         elems->rsn_len = elen;
662                         break;
663                 case WLAN_EID_ERP_INFO:
664                         elems->erp_info = pos;
665                         elems->erp_info_len = elen;
666                         break;
667                 case WLAN_EID_EXT_SUPP_RATES:
668                         elems->ext_supp_rates = pos;
669                         elems->ext_supp_rates_len = elen;
670                         break;
671                 case WLAN_EID_HT_CAPABILITY:
672                         if (elen >= sizeof(struct ieee80211_ht_cap))
673                                 elems->ht_cap_elem = (void *)pos;
674                         break;
675                 case WLAN_EID_HT_INFORMATION:
676                         if (elen >= sizeof(struct ieee80211_ht_info))
677                                 elems->ht_info_elem = (void *)pos;
678                         break;
679                 case WLAN_EID_MESH_ID:
680                         elems->mesh_id = pos;
681                         elems->mesh_id_len = elen;
682                         break;
683                 case WLAN_EID_MESH_CONFIG:
684                         if (elen >= sizeof(struct ieee80211_meshconf_ie))
685                                 elems->mesh_config = (void *)pos;
686                         break;
687                 case WLAN_EID_PEER_LINK:
688                         elems->peer_link = pos;
689                         elems->peer_link_len = elen;
690                         break;
691                 case WLAN_EID_PREQ:
692                         elems->preq = pos;
693                         elems->preq_len = elen;
694                         break;
695                 case WLAN_EID_PREP:
696                         elems->prep = pos;
697                         elems->prep_len = elen;
698                         break;
699                 case WLAN_EID_PERR:
700                         elems->perr = pos;
701                         elems->perr_len = elen;
702                         break;
703                 case WLAN_EID_RANN:
704                         if (elen >= sizeof(struct ieee80211_rann_ie))
705                                 elems->rann = (void *)pos;
706                         break;
707                 case WLAN_EID_CHANNEL_SWITCH:
708                         elems->ch_switch_elem = pos;
709                         elems->ch_switch_elem_len = elen;
710                         break;
711                 case WLAN_EID_QUIET:
712                         if (!elems->quiet_elem) {
713                                 elems->quiet_elem = pos;
714                                 elems->quiet_elem_len = elen;
715                         }
716                         elems->num_of_quiet_elem++;
717                         break;
718                 case WLAN_EID_COUNTRY:
719                         elems->country_elem = pos;
720                         elems->country_elem_len = elen;
721                         break;
722                 case WLAN_EID_PWR_CONSTRAINT:
723                         elems->pwr_constr_elem = pos;
724                         elems->pwr_constr_elem_len = elen;
725                         break;
726                 case WLAN_EID_TIMEOUT_INTERVAL:
727                         elems->timeout_int = pos;
728                         elems->timeout_int_len = elen;
729                         break;
730                 default:
731                         break;
732                 }
733
734                 left -= elen;
735                 pos += elen;
736         }
737
738         return crc;
739 }
740
741 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata)
742 {
743         struct ieee80211_local *local = sdata->local;
744         struct ieee80211_tx_queue_params qparam;
745         int queue;
746         bool use_11b;
747         int aCWmin, aCWmax;
748
749         if (!local->ops->conf_tx)
750                 return;
751
752         memset(&qparam, 0, sizeof(qparam));
753
754         use_11b = (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) &&
755                  !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
756
757         for (queue = 0; queue < local_to_hw(local)->queues; queue++) {
758                 /* Set defaults according to 802.11-2007 Table 7-37 */
759                 aCWmax = 1023;
760                 if (use_11b)
761                         aCWmin = 31;
762                 else
763                         aCWmin = 15;
764
765                 switch (queue) {
766                 case 3: /* AC_BK */
767                         qparam.cw_max = aCWmax;
768                         qparam.cw_min = aCWmin;
769                         qparam.txop = 0;
770                         qparam.aifs = 7;
771                         break;
772                 default: /* never happens but let's not leave undefined */
773                 case 2: /* AC_BE */
774                         qparam.cw_max = aCWmax;
775                         qparam.cw_min = aCWmin;
776                         qparam.txop = 0;
777                         qparam.aifs = 3;
778                         break;
779                 case 1: /* AC_VI */
780                         qparam.cw_max = aCWmin;
781                         qparam.cw_min = (aCWmin + 1) / 2 - 1;
782                         if (use_11b)
783                                 qparam.txop = 6016/32;
784                         else
785                                 qparam.txop = 3008/32;
786                         qparam.aifs = 2;
787                         break;
788                 case 0: /* AC_VO */
789                         qparam.cw_max = (aCWmin + 1) / 2 - 1;
790                         qparam.cw_min = (aCWmin + 1) / 4 - 1;
791                         if (use_11b)
792                                 qparam.txop = 3264/32;
793                         else
794                                 qparam.txop = 1504/32;
795                         qparam.aifs = 2;
796                         break;
797                 }
798
799                 qparam.uapsd = false;
800
801                 drv_conf_tx(local, queue, &qparam);
802         }
803
804         /* after reinitialize QoS TX queues setting to default,
805          * disable QoS at all */
806
807         if (sdata->vif.type != NL80211_IFTYPE_MONITOR) {
808                 sdata->vif.bss_conf.qos =
809                         sdata->vif.type != NL80211_IFTYPE_STATION;
810                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
811         }
812 }
813
814 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
815                                   const size_t supp_rates_len,
816                                   const u8 *supp_rates)
817 {
818         struct ieee80211_local *local = sdata->local;
819         int i, have_higher_than_11mbit = 0;
820
821         /* cf. IEEE 802.11 9.2.12 */
822         for (i = 0; i < supp_rates_len; i++)
823                 if ((supp_rates[i] & 0x7f) * 5 > 110)
824                         have_higher_than_11mbit = 1;
825
826         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
827             have_higher_than_11mbit)
828                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
829         else
830                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
831
832         ieee80211_set_wmm_default(sdata);
833 }
834
835 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
836                               enum ieee80211_band band)
837 {
838         struct ieee80211_supported_band *sband;
839         struct ieee80211_rate *bitrates;
840         u32 mandatory_rates;
841         enum ieee80211_rate_flags mandatory_flag;
842         int i;
843
844         sband = local->hw.wiphy->bands[band];
845         if (!sband) {
846                 WARN_ON(1);
847                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
848         }
849
850         if (band == IEEE80211_BAND_2GHZ)
851                 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
852         else
853                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
854
855         bitrates = sband->bitrates;
856         mandatory_rates = 0;
857         for (i = 0; i < sband->n_bitrates; i++)
858                 if (bitrates[i].flags & mandatory_flag)
859                         mandatory_rates |= BIT(i);
860         return mandatory_rates;
861 }
862
863 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
864                          u16 transaction, u16 auth_alg,
865                          u8 *extra, size_t extra_len, const u8 *bssid,
866                          const u8 *key, u8 key_len, u8 key_idx)
867 {
868         struct ieee80211_local *local = sdata->local;
869         struct sk_buff *skb;
870         struct ieee80211_mgmt *mgmt;
871         int err;
872
873         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
874                             sizeof(*mgmt) + 6 + extra_len);
875         if (!skb) {
876                 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
877                        "frame\n", sdata->name);
878                 return;
879         }
880         skb_reserve(skb, local->hw.extra_tx_headroom);
881
882         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
883         memset(mgmt, 0, 24 + 6);
884         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
885                                           IEEE80211_STYPE_AUTH);
886         memcpy(mgmt->da, bssid, ETH_ALEN);
887         memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
888         memcpy(mgmt->bssid, bssid, ETH_ALEN);
889         mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
890         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
891         mgmt->u.auth.status_code = cpu_to_le16(0);
892         if (extra)
893                 memcpy(skb_put(skb, extra_len), extra, extra_len);
894
895         if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
896                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
897                 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
898                 WARN_ON(err);
899         }
900
901         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
902         ieee80211_tx_skb(sdata, skb);
903 }
904
905 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
906                              const u8 *ie, size_t ie_len,
907                              enum ieee80211_band band)
908 {
909         struct ieee80211_supported_band *sband;
910         u8 *pos;
911         size_t offset = 0, noffset;
912         int supp_rates_len, i;
913
914         sband = local->hw.wiphy->bands[band];
915
916         pos = buffer;
917
918         supp_rates_len = min_t(int, sband->n_bitrates, 8);
919
920         *pos++ = WLAN_EID_SUPP_RATES;
921         *pos++ = supp_rates_len;
922
923         for (i = 0; i < supp_rates_len; i++) {
924                 int rate = sband->bitrates[i].bitrate;
925                 *pos++ = (u8) (rate / 5);
926         }
927
928         /* insert "request information" if in custom IEs */
929         if (ie && ie_len) {
930                 static const u8 before_extrates[] = {
931                         WLAN_EID_SSID,
932                         WLAN_EID_SUPP_RATES,
933                         WLAN_EID_REQUEST,
934                 };
935                 noffset = ieee80211_ie_split(ie, ie_len,
936                                              before_extrates,
937                                              ARRAY_SIZE(before_extrates),
938                                              offset);
939                 memcpy(pos, ie + offset, noffset - offset);
940                 pos += noffset - offset;
941                 offset = noffset;
942         }
943
944         if (sband->n_bitrates > i) {
945                 *pos++ = WLAN_EID_EXT_SUPP_RATES;
946                 *pos++ = sband->n_bitrates - i;
947
948                 for (; i < sband->n_bitrates; i++) {
949                         int rate = sband->bitrates[i].bitrate;
950                         *pos++ = (u8) (rate / 5);
951                 }
952         }
953
954         /* insert custom IEs that go before HT */
955         if (ie && ie_len) {
956                 static const u8 before_ht[] = {
957                         WLAN_EID_SSID,
958                         WLAN_EID_SUPP_RATES,
959                         WLAN_EID_REQUEST,
960                         WLAN_EID_EXT_SUPP_RATES,
961                         WLAN_EID_DS_PARAMS,
962                         WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
963                 };
964                 noffset = ieee80211_ie_split(ie, ie_len,
965                                              before_ht, ARRAY_SIZE(before_ht),
966                                              offset);
967                 memcpy(pos, ie + offset, noffset - offset);
968                 pos += noffset - offset;
969                 offset = noffset;
970         }
971
972         if (sband->ht_cap.ht_supported) {
973                 u16 cap = sband->ht_cap.cap;
974                 __le16 tmp;
975
976                 if (ieee80211_disable_40mhz_24ghz &&
977                     sband->band == IEEE80211_BAND_2GHZ) {
978                         cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
979                         cap &= ~IEEE80211_HT_CAP_SGI_40;
980                 }
981
982                 *pos++ = WLAN_EID_HT_CAPABILITY;
983                 *pos++ = sizeof(struct ieee80211_ht_cap);
984                 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
985                 tmp = cpu_to_le16(cap);
986                 memcpy(pos, &tmp, sizeof(u16));
987                 pos += sizeof(u16);
988                 *pos++ = sband->ht_cap.ampdu_factor |
989                          (sband->ht_cap.ampdu_density <<
990                                 IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
991                 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
992                 pos += sizeof(sband->ht_cap.mcs);
993                 pos += 2 + 4 + 1; /* ext info, BF cap, antsel */
994         }
995
996         /*
997          * If adding more here, adjust code in main.c
998          * that calculates local->scan_ies_len.
999          */
1000
1001         /* add any remaining custom IEs */
1002         if (ie && ie_len) {
1003                 noffset = ie_len;
1004                 memcpy(pos, ie + offset, noffset - offset);
1005                 pos += noffset - offset;
1006         }
1007
1008         return pos - buffer;
1009 }
1010
1011 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1012                               const u8 *ssid, size_t ssid_len,
1013                               const u8 *ie, size_t ie_len)
1014 {
1015         struct ieee80211_local *local = sdata->local;
1016         struct sk_buff *skb;
1017         struct ieee80211_mgmt *mgmt;
1018         size_t buf_len;
1019         u8 *buf;
1020
1021         /* FIXME: come up with a proper value */
1022         buf = kmalloc(200 + ie_len, GFP_KERNEL);
1023         if (!buf) {
1024                 printk(KERN_DEBUG "%s: failed to allocate temporary IE "
1025                        "buffer\n", sdata->name);
1026                 return;
1027         }
1028
1029         buf_len = ieee80211_build_preq_ies(local, buf, ie, ie_len,
1030                                            local->hw.conf.channel->band);
1031
1032         skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
1033                                      ssid, ssid_len,
1034                                      buf, buf_len);
1035
1036         if (dst) {
1037                 mgmt = (struct ieee80211_mgmt *) skb->data;
1038                 memcpy(mgmt->da, dst, ETH_ALEN);
1039                 memcpy(mgmt->bssid, dst, ETH_ALEN);
1040         }
1041
1042         IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1043         ieee80211_tx_skb(sdata, skb);
1044         kfree(buf);
1045 }
1046
1047 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
1048                             struct ieee802_11_elems *elems,
1049                             enum ieee80211_band band)
1050 {
1051         struct ieee80211_supported_band *sband;
1052         struct ieee80211_rate *bitrates;
1053         size_t num_rates;
1054         u32 supp_rates;
1055         int i, j;
1056         sband = local->hw.wiphy->bands[band];
1057
1058         if (!sband) {
1059                 WARN_ON(1);
1060                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1061         }
1062
1063         bitrates = sband->bitrates;
1064         num_rates = sband->n_bitrates;
1065         supp_rates = 0;
1066         for (i = 0; i < elems->supp_rates_len +
1067                      elems->ext_supp_rates_len; i++) {
1068                 u8 rate = 0;
1069                 int own_rate;
1070                 if (i < elems->supp_rates_len)
1071                         rate = elems->supp_rates[i];
1072                 else if (elems->ext_supp_rates)
1073                         rate = elems->ext_supp_rates
1074                                 [i - elems->supp_rates_len];
1075                 own_rate = 5 * (rate & 0x7f);
1076                 for (j = 0; j < num_rates; j++)
1077                         if (bitrates[j].bitrate == own_rate)
1078                                 supp_rates |= BIT(j);
1079         }
1080         return supp_rates;
1081 }
1082
1083 void ieee80211_stop_device(struct ieee80211_local *local)
1084 {
1085         ieee80211_led_radio(local, false);
1086
1087         cancel_work_sync(&local->reconfig_filter);
1088
1089         flush_workqueue(local->workqueue);
1090         drv_stop(local);
1091 }
1092
1093 int ieee80211_reconfig(struct ieee80211_local *local)
1094 {
1095         struct ieee80211_hw *hw = &local->hw;
1096         struct ieee80211_sub_if_data *sdata;
1097         struct sta_info *sta;
1098         int res;
1099
1100         if (local->suspended)
1101                 local->resuming = true;
1102
1103         /* restart hardware */
1104         if (local->open_count) {
1105                 /*
1106                  * Upon resume hardware can sometimes be goofy due to
1107                  * various platform / driver / bus issues, so restarting
1108                  * the device may at times not work immediately. Propagate
1109                  * the error.
1110                  */
1111                 res = drv_start(local);
1112                 if (res) {
1113                         WARN(local->suspended, "Hardware became unavailable "
1114                              "upon resume. This could be a software issue "
1115                              "prior to suspend or a hardware issue.\n");
1116                         return res;
1117                 }
1118
1119                 ieee80211_led_radio(local, true);
1120         }
1121
1122         /* add interfaces */
1123         list_for_each_entry(sdata, &local->interfaces, list) {
1124                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1125                     sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1126                     ieee80211_sdata_running(sdata))
1127                         res = drv_add_interface(local, &sdata->vif);
1128         }
1129
1130         /* add STAs back */
1131         mutex_lock(&local->sta_mtx);
1132         list_for_each_entry(sta, &local->sta_list, list) {
1133                 if (sta->uploaded) {
1134                         sdata = sta->sdata;
1135                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1136                                 sdata = container_of(sdata->bss,
1137                                              struct ieee80211_sub_if_data,
1138                                              u.ap);
1139
1140                         WARN_ON(drv_sta_add(local, sdata, &sta->sta));
1141                 }
1142         }
1143         mutex_unlock(&local->sta_mtx);
1144
1145         /* setup RTS threshold */
1146         drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1147
1148         /* reconfigure hardware */
1149         ieee80211_hw_config(local, ~0);
1150
1151         ieee80211_configure_filter(local);
1152
1153         /* Finally also reconfigure all the BSS information */
1154         list_for_each_entry(sdata, &local->interfaces, list) {
1155                 u32 changed;
1156
1157                 if (!ieee80211_sdata_running(sdata))
1158                         continue;
1159
1160                 /* common change flags for all interface types */
1161                 changed = BSS_CHANGED_ERP_CTS_PROT |
1162                           BSS_CHANGED_ERP_PREAMBLE |
1163                           BSS_CHANGED_ERP_SLOT |
1164                           BSS_CHANGED_HT |
1165                           BSS_CHANGED_BASIC_RATES |
1166                           BSS_CHANGED_BEACON_INT |
1167                           BSS_CHANGED_BSSID |
1168                           BSS_CHANGED_CQM |
1169                           BSS_CHANGED_QOS;
1170
1171                 switch (sdata->vif.type) {
1172                 case NL80211_IFTYPE_STATION:
1173                         changed |= BSS_CHANGED_ASSOC;
1174                         ieee80211_bss_info_change_notify(sdata, changed);
1175                         break;
1176                 case NL80211_IFTYPE_ADHOC:
1177                         changed |= BSS_CHANGED_IBSS;
1178                         /* fall through */
1179                 case NL80211_IFTYPE_AP:
1180                 case NL80211_IFTYPE_MESH_POINT:
1181                         changed |= BSS_CHANGED_BEACON |
1182                                    BSS_CHANGED_BEACON_ENABLED;
1183                         ieee80211_bss_info_change_notify(sdata, changed);
1184                         break;
1185                 case NL80211_IFTYPE_WDS:
1186                         break;
1187                 case NL80211_IFTYPE_AP_VLAN:
1188                 case NL80211_IFTYPE_MONITOR:
1189                         /* ignore virtual */
1190                         break;
1191                 case NL80211_IFTYPE_UNSPECIFIED:
1192                 case __NL80211_IFTYPE_AFTER_LAST:
1193                         WARN_ON(1);
1194                         break;
1195                 }
1196         }
1197
1198         /*
1199          * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
1200          * sessions can be established after a resume.
1201          *
1202          * Also tear down aggregation sessions since reconfiguring
1203          * them in a hardware restart scenario is not easily done
1204          * right now, and the hardware will have lost information
1205          * about the sessions, but we and the AP still think they
1206          * are active. This is really a workaround though.
1207          */
1208         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1209                 mutex_lock(&local->sta_mtx);
1210
1211                 list_for_each_entry(sta, &local->sta_list, list) {
1212                         ieee80211_sta_tear_down_BA_sessions(sta);
1213                         clear_sta_flags(sta, WLAN_STA_BLOCK_BA);
1214                 }
1215
1216                 mutex_unlock(&local->sta_mtx);
1217         }
1218
1219         /* add back keys */
1220         list_for_each_entry(sdata, &local->interfaces, list)
1221                 if (ieee80211_sdata_running(sdata))
1222                         ieee80211_enable_keys(sdata);
1223
1224         ieee80211_wake_queues_by_reason(hw,
1225                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1226
1227         /*
1228          * If this is for hw restart things are still running.
1229          * We may want to change that later, however.
1230          */
1231         if (!local->suspended)
1232                 return 0;
1233
1234 #ifdef CONFIG_PM
1235         /* first set suspended false, then resuming */
1236         local->suspended = false;
1237         mb();
1238         local->resuming = false;
1239
1240         list_for_each_entry(sdata, &local->interfaces, list) {
1241                 switch(sdata->vif.type) {
1242                 case NL80211_IFTYPE_STATION:
1243                         ieee80211_sta_restart(sdata);
1244                         break;
1245                 case NL80211_IFTYPE_ADHOC:
1246                         ieee80211_ibss_restart(sdata);
1247                         break;
1248                 case NL80211_IFTYPE_MESH_POINT:
1249                         ieee80211_mesh_restart(sdata);
1250                         break;
1251                 default:
1252                         break;
1253                 }
1254         }
1255
1256         add_timer(&local->sta_cleanup);
1257
1258         mutex_lock(&local->sta_mtx);
1259         list_for_each_entry(sta, &local->sta_list, list)
1260                 mesh_plink_restart(sta);
1261         mutex_unlock(&local->sta_mtx);
1262 #else
1263         WARN_ON(1);
1264 #endif
1265         return 0;
1266 }
1267
1268 static int check_mgd_smps(struct ieee80211_if_managed *ifmgd,
1269                           enum ieee80211_smps_mode *smps_mode)
1270 {
1271         if (ifmgd->associated) {
1272                 *smps_mode = ifmgd->ap_smps;
1273
1274                 if (*smps_mode == IEEE80211_SMPS_AUTOMATIC) {
1275                         if (ifmgd->powersave)
1276                                 *smps_mode = IEEE80211_SMPS_DYNAMIC;
1277                         else
1278                                 *smps_mode = IEEE80211_SMPS_OFF;
1279                 }
1280
1281                 return 1;
1282         }
1283
1284         return 0;
1285 }
1286
1287 /* must hold iflist_mtx */
1288 void ieee80211_recalc_smps(struct ieee80211_local *local,
1289                            struct ieee80211_sub_if_data *forsdata)
1290 {
1291         struct ieee80211_sub_if_data *sdata;
1292         enum ieee80211_smps_mode smps_mode = IEEE80211_SMPS_OFF;
1293         int count = 0;
1294
1295         if (forsdata)
1296                 WARN_ON(!mutex_is_locked(&forsdata->u.mgd.mtx));
1297
1298         WARN_ON(!mutex_is_locked(&local->iflist_mtx));
1299
1300         /*
1301          * This function could be improved to handle multiple
1302          * interfaces better, but right now it makes any
1303          * non-station interfaces force SM PS to be turned
1304          * off. If there are multiple station interfaces it
1305          * could also use the best possible mode, e.g. if
1306          * one is in static and the other in dynamic then
1307          * dynamic is ok.
1308          */
1309
1310         list_for_each_entry(sdata, &local->interfaces, list) {
1311                 if (!netif_running(sdata->dev))
1312                         continue;
1313                 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1314                         goto set;
1315                 if (sdata != forsdata) {
1316                         /*
1317                          * This nested is ok -- we are holding the iflist_mtx
1318                          * so can't get here twice or so. But it's required
1319                          * since normally we acquire it first and then the
1320                          * iflist_mtx.
1321                          */
1322                         mutex_lock_nested(&sdata->u.mgd.mtx, SINGLE_DEPTH_NESTING);
1323                         count += check_mgd_smps(&sdata->u.mgd, &smps_mode);
1324                         mutex_unlock(&sdata->u.mgd.mtx);
1325                 } else
1326                         count += check_mgd_smps(&sdata->u.mgd, &smps_mode);
1327
1328                 if (count > 1) {
1329                         smps_mode = IEEE80211_SMPS_OFF;
1330                         break;
1331                 }
1332         }
1333
1334         if (smps_mode == local->smps_mode)
1335                 return;
1336
1337  set:
1338         local->smps_mode = smps_mode;
1339         /* changed flag is auto-detected for this */
1340         ieee80211_hw_config(local, 0);
1341 }
1342
1343 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1344 {
1345         int i;
1346
1347         for (i = 0; i < n_ids; i++)
1348                 if (ids[i] == id)
1349                         return true;
1350         return false;
1351 }
1352
1353 /**
1354  * ieee80211_ie_split - split an IE buffer according to ordering
1355  *
1356  * @ies: the IE buffer
1357  * @ielen: the length of the IE buffer
1358  * @ids: an array with element IDs that are allowed before
1359  *      the split
1360  * @n_ids: the size of the element ID array
1361  * @offset: offset where to start splitting in the buffer
1362  *
1363  * This function splits an IE buffer by updating the @offset
1364  * variable to point to the location where the buffer should be
1365  * split.
1366  *
1367  * It assumes that the given IE buffer is well-formed, this
1368  * has to be guaranteed by the caller!
1369  *
1370  * It also assumes that the IEs in the buffer are ordered
1371  * correctly, if not the result of using this function will not
1372  * be ordered correctly either, i.e. it does no reordering.
1373  *
1374  * The function returns the offset where the next part of the
1375  * buffer starts, which may be @ielen if the entire (remainder)
1376  * of the buffer should be used.
1377  */
1378 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1379                           const u8 *ids, int n_ids, size_t offset)
1380 {
1381         size_t pos = offset;
1382
1383         while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1384                 pos += 2 + ies[pos + 1];
1385
1386         return pos;
1387 }
1388
1389 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1390 {
1391         size_t pos = offset;
1392
1393         while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1394                 pos += 2 + ies[pos + 1];
1395
1396         return pos;
1397 }