66ce96a69f318bab53cf88a8946c49b494f7b9ab
[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/wireless.h>
22 #include <linux/bitmap.h>
23 #include <linux/crc32.h>
24 #include <net/net_namespace.h>
25 #include <net/cfg80211.h>
26 #include <net/rtnetlink.h>
27
28 #include "ieee80211_i.h"
29 #include "driver-ops.h"
30 #include "rate.h"
31 #include "mesh.h"
32 #include "wme.h"
33 #include "led.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
272         if (WARN_ON(queue >= hw->queues))
273                 return;
274
275         __clear_bit(reason, &local->queue_stop_reasons[queue]);
276
277         if (!skb_queue_empty(&local->pending[queue]) &&
278             local->queue_stop_reasons[queue] ==
279                                 BIT(IEEE80211_QUEUE_STOP_REASON_PENDING))
280                 tasklet_schedule(&local->tx_pending_tasklet);
281
282         if (local->queue_stop_reasons[queue] != 0)
283                 /* someone still has this queue stopped */
284                 return;
285
286         netif_wake_subqueue(local->mdev, queue);
287 }
288
289 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
290                                     enum queue_stop_reason reason)
291 {
292         struct ieee80211_local *local = hw_to_local(hw);
293         unsigned long flags;
294
295         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
296         __ieee80211_wake_queue(hw, queue, reason);
297         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
298 }
299
300 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
301 {
302         ieee80211_wake_queue_by_reason(hw, queue,
303                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
304 }
305 EXPORT_SYMBOL(ieee80211_wake_queue);
306
307 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
308                                    enum queue_stop_reason reason)
309 {
310         struct ieee80211_local *local = hw_to_local(hw);
311
312         if (WARN_ON(queue >= hw->queues))
313                 return;
314
315         /*
316          * Only stop if it was previously running, this is necessary
317          * for correct pending packets handling because there we may
318          * start (but not wake) the queue and rely on that.
319          */
320         if (!local->queue_stop_reasons[queue])
321                 netif_stop_subqueue(local->mdev, queue);
322
323         __set_bit(reason, &local->queue_stop_reasons[queue]);
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
351         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
352         __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
353         __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_PENDING);
354         skb_queue_tail(&local->pending[queue], skb);
355         __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
356         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
357 }
358
359 int ieee80211_add_pending_skbs(struct ieee80211_local *local,
360                                struct sk_buff_head *skbs)
361 {
362         struct ieee80211_hw *hw = &local->hw;
363         struct sk_buff *skb;
364         unsigned long flags;
365         int queue, ret = 0, i;
366
367         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
368         for (i = 0; i < hw->queues; i++)
369                 __ieee80211_stop_queue(hw, i,
370                         IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
371
372         while ((skb = skb_dequeue(skbs))) {
373                 ret++;
374                 queue = skb_get_queue_mapping(skb);
375                 skb_queue_tail(&local->pending[queue], skb);
376         }
377
378         for (i = 0; i < hw->queues; i++) {
379                 if (ret)
380                         __ieee80211_stop_queue(hw, i,
381                                 IEEE80211_QUEUE_STOP_REASON_PENDING);
382                 __ieee80211_wake_queue(hw, i,
383                         IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
384         }
385         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
386
387         return ret;
388 }
389
390 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
391                                     enum queue_stop_reason reason)
392 {
393         struct ieee80211_local *local = hw_to_local(hw);
394         unsigned long flags;
395         int i;
396
397         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
398
399         for (i = 0; i < hw->queues; i++)
400                 __ieee80211_stop_queue(hw, i, reason);
401
402         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
403 }
404
405 void ieee80211_stop_queues(struct ieee80211_hw *hw)
406 {
407         ieee80211_stop_queues_by_reason(hw,
408                                         IEEE80211_QUEUE_STOP_REASON_DRIVER);
409 }
410 EXPORT_SYMBOL(ieee80211_stop_queues);
411
412 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
413 {
414         struct ieee80211_local *local = hw_to_local(hw);
415
416         if (WARN_ON(queue >= hw->queues))
417                 return true;
418
419         return __netif_subqueue_stopped(local->mdev, queue);
420 }
421 EXPORT_SYMBOL(ieee80211_queue_stopped);
422
423 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
424                                      enum queue_stop_reason reason)
425 {
426         struct ieee80211_local *local = hw_to_local(hw);
427         unsigned long flags;
428         int i;
429
430         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
431
432         for (i = 0; i < hw->queues; i++)
433                 __ieee80211_wake_queue(hw, i, reason);
434
435         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
436 }
437
438 void ieee80211_wake_queues(struct ieee80211_hw *hw)
439 {
440         ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
441 }
442 EXPORT_SYMBOL(ieee80211_wake_queues);
443
444 void ieee80211_iterate_active_interfaces(
445         struct ieee80211_hw *hw,
446         void (*iterator)(void *data, u8 *mac,
447                          struct ieee80211_vif *vif),
448         void *data)
449 {
450         struct ieee80211_local *local = hw_to_local(hw);
451         struct ieee80211_sub_if_data *sdata;
452
453         mutex_lock(&local->iflist_mtx);
454
455         list_for_each_entry(sdata, &local->interfaces, list) {
456                 switch (sdata->vif.type) {
457                 case __NL80211_IFTYPE_AFTER_LAST:
458                 case NL80211_IFTYPE_UNSPECIFIED:
459                 case NL80211_IFTYPE_MONITOR:
460                 case NL80211_IFTYPE_AP_VLAN:
461                         continue;
462                 case NL80211_IFTYPE_AP:
463                 case NL80211_IFTYPE_STATION:
464                 case NL80211_IFTYPE_ADHOC:
465                 case NL80211_IFTYPE_WDS:
466                 case NL80211_IFTYPE_MESH_POINT:
467                         break;
468                 }
469                 if (netif_running(sdata->dev))
470                         iterator(data, sdata->dev->dev_addr,
471                                  &sdata->vif);
472         }
473
474         mutex_unlock(&local->iflist_mtx);
475 }
476 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
477
478 void ieee80211_iterate_active_interfaces_atomic(
479         struct ieee80211_hw *hw,
480         void (*iterator)(void *data, u8 *mac,
481                          struct ieee80211_vif *vif),
482         void *data)
483 {
484         struct ieee80211_local *local = hw_to_local(hw);
485         struct ieee80211_sub_if_data *sdata;
486
487         rcu_read_lock();
488
489         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
490                 switch (sdata->vif.type) {
491                 case __NL80211_IFTYPE_AFTER_LAST:
492                 case NL80211_IFTYPE_UNSPECIFIED:
493                 case NL80211_IFTYPE_MONITOR:
494                 case NL80211_IFTYPE_AP_VLAN:
495                         continue;
496                 case NL80211_IFTYPE_AP:
497                 case NL80211_IFTYPE_STATION:
498                 case NL80211_IFTYPE_ADHOC:
499                 case NL80211_IFTYPE_WDS:
500                 case NL80211_IFTYPE_MESH_POINT:
501                         break;
502                 }
503                 if (netif_running(sdata->dev))
504                         iterator(data, sdata->dev->dev_addr,
505                                  &sdata->vif);
506         }
507
508         rcu_read_unlock();
509 }
510 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
511
512 void ieee802_11_parse_elems(u8 *start, size_t len,
513                             struct ieee802_11_elems *elems)
514 {
515         ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
516 }
517
518 u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
519                                struct ieee802_11_elems *elems,
520                                u64 filter, u32 crc)
521 {
522         size_t left = len;
523         u8 *pos = start;
524         bool calc_crc = filter != 0;
525
526         memset(elems, 0, sizeof(*elems));
527         elems->ie_start = start;
528         elems->total_len = len;
529
530         while (left >= 2) {
531                 u8 id, elen;
532
533                 id = *pos++;
534                 elen = *pos++;
535                 left -= 2;
536
537                 if (elen > left)
538                         break;
539
540                 if (calc_crc && id < 64 && (filter & BIT(id)))
541                         crc = crc32_be(crc, pos - 2, elen + 2);
542
543                 switch (id) {
544                 case WLAN_EID_SSID:
545                         elems->ssid = pos;
546                         elems->ssid_len = elen;
547                         break;
548                 case WLAN_EID_SUPP_RATES:
549                         elems->supp_rates = pos;
550                         elems->supp_rates_len = elen;
551                         break;
552                 case WLAN_EID_FH_PARAMS:
553                         elems->fh_params = pos;
554                         elems->fh_params_len = elen;
555                         break;
556                 case WLAN_EID_DS_PARAMS:
557                         elems->ds_params = pos;
558                         elems->ds_params_len = elen;
559                         break;
560                 case WLAN_EID_CF_PARAMS:
561                         elems->cf_params = pos;
562                         elems->cf_params_len = elen;
563                         break;
564                 case WLAN_EID_TIM:
565                         if (elen >= sizeof(struct ieee80211_tim_ie)) {
566                                 elems->tim = (void *)pos;
567                                 elems->tim_len = elen;
568                         }
569                         break;
570                 case WLAN_EID_IBSS_PARAMS:
571                         elems->ibss_params = pos;
572                         elems->ibss_params_len = elen;
573                         break;
574                 case WLAN_EID_CHALLENGE:
575                         elems->challenge = pos;
576                         elems->challenge_len = elen;
577                         break;
578                 case WLAN_EID_VENDOR_SPECIFIC:
579                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
580                             pos[2] == 0xf2) {
581                                 /* Microsoft OUI (00:50:F2) */
582
583                                 if (calc_crc)
584                                         crc = crc32_be(crc, pos - 2, elen + 2);
585
586                                 if (pos[3] == 1) {
587                                         /* OUI Type 1 - WPA IE */
588                                         elems->wpa = pos;
589                                         elems->wpa_len = elen;
590                                 } else if (elen >= 5 && pos[3] == 2) {
591                                         /* OUI Type 2 - WMM IE */
592                                         if (pos[4] == 0) {
593                                                 elems->wmm_info = pos;
594                                                 elems->wmm_info_len = elen;
595                                         } else if (pos[4] == 1) {
596                                                 elems->wmm_param = pos;
597                                                 elems->wmm_param_len = elen;
598                                         }
599                                 }
600                         }
601                         break;
602                 case WLAN_EID_RSN:
603                         elems->rsn = pos;
604                         elems->rsn_len = elen;
605                         break;
606                 case WLAN_EID_ERP_INFO:
607                         elems->erp_info = pos;
608                         elems->erp_info_len = elen;
609                         break;
610                 case WLAN_EID_EXT_SUPP_RATES:
611                         elems->ext_supp_rates = pos;
612                         elems->ext_supp_rates_len = elen;
613                         break;
614                 case WLAN_EID_HT_CAPABILITY:
615                         if (elen >= sizeof(struct ieee80211_ht_cap))
616                                 elems->ht_cap_elem = (void *)pos;
617                         break;
618                 case WLAN_EID_HT_INFORMATION:
619                         if (elen >= sizeof(struct ieee80211_ht_info))
620                                 elems->ht_info_elem = (void *)pos;
621                         break;
622                 case WLAN_EID_MESH_ID:
623                         elems->mesh_id = pos;
624                         elems->mesh_id_len = elen;
625                         break;
626                 case WLAN_EID_MESH_CONFIG:
627                         elems->mesh_config = pos;
628                         elems->mesh_config_len = elen;
629                         break;
630                 case WLAN_EID_PEER_LINK:
631                         elems->peer_link = pos;
632                         elems->peer_link_len = elen;
633                         break;
634                 case WLAN_EID_PREQ:
635                         elems->preq = pos;
636                         elems->preq_len = elen;
637                         break;
638                 case WLAN_EID_PREP:
639                         elems->prep = pos;
640                         elems->prep_len = elen;
641                         break;
642                 case WLAN_EID_PERR:
643                         elems->perr = pos;
644                         elems->perr_len = elen;
645                         break;
646                 case WLAN_EID_CHANNEL_SWITCH:
647                         elems->ch_switch_elem = pos;
648                         elems->ch_switch_elem_len = elen;
649                         break;
650                 case WLAN_EID_QUIET:
651                         if (!elems->quiet_elem) {
652                                 elems->quiet_elem = pos;
653                                 elems->quiet_elem_len = elen;
654                         }
655                         elems->num_of_quiet_elem++;
656                         break;
657                 case WLAN_EID_COUNTRY:
658                         elems->country_elem = pos;
659                         elems->country_elem_len = elen;
660                         break;
661                 case WLAN_EID_PWR_CONSTRAINT:
662                         elems->pwr_constr_elem = pos;
663                         elems->pwr_constr_elem_len = elen;
664                         break;
665                 case WLAN_EID_TIMEOUT_INTERVAL:
666                         elems->timeout_int = pos;
667                         elems->timeout_int_len = elen;
668                         break;
669                 default:
670                         break;
671                 }
672
673                 left -= elen;
674                 pos += elen;
675         }
676
677         return crc;
678 }
679
680 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata)
681 {
682         struct ieee80211_local *local = sdata->local;
683         struct ieee80211_tx_queue_params qparam;
684         int queue;
685         bool use_11b;
686         int aCWmin, aCWmax;
687
688         if (!local->ops->conf_tx)
689                 return;
690
691         memset(&qparam, 0, sizeof(qparam));
692
693         use_11b = (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) &&
694                  !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
695
696         for (queue = 0; queue < local_to_hw(local)->queues; queue++) {
697                 /* Set defaults according to 802.11-2007 Table 7-37 */
698                 aCWmax = 1023;
699                 if (use_11b)
700                         aCWmin = 31;
701                 else
702                         aCWmin = 15;
703
704                 switch (queue) {
705                 case 3: /* AC_BK */
706                         qparam.cw_max = aCWmax;
707                         qparam.cw_min = aCWmin;
708                         qparam.txop = 0;
709                         qparam.aifs = 7;
710                         break;
711                 default: /* never happens but let's not leave undefined */
712                 case 2: /* AC_BE */
713                         qparam.cw_max = aCWmax;
714                         qparam.cw_min = aCWmin;
715                         qparam.txop = 0;
716                         qparam.aifs = 3;
717                         break;
718                 case 1: /* AC_VI */
719                         qparam.cw_max = aCWmin;
720                         qparam.cw_min = (aCWmin + 1) / 2 - 1;
721                         if (use_11b)
722                                 qparam.txop = 6016/32;
723                         else
724                                 qparam.txop = 3008/32;
725                         qparam.aifs = 2;
726                         break;
727                 case 0: /* AC_VO */
728                         qparam.cw_max = (aCWmin + 1) / 2 - 1;
729                         qparam.cw_min = (aCWmin + 1) / 4 - 1;
730                         if (use_11b)
731                                 qparam.txop = 3264/32;
732                         else
733                                 qparam.txop = 1504/32;
734                         qparam.aifs = 2;
735                         break;
736                 }
737
738                 drv_conf_tx(local, queue, &qparam);
739         }
740 }
741
742 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
743                                   const size_t supp_rates_len,
744                                   const u8 *supp_rates)
745 {
746         struct ieee80211_local *local = sdata->local;
747         int i, have_higher_than_11mbit = 0;
748
749         /* cf. IEEE 802.11 9.2.12 */
750         for (i = 0; i < supp_rates_len; i++)
751                 if ((supp_rates[i] & 0x7f) * 5 > 110)
752                         have_higher_than_11mbit = 1;
753
754         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
755             have_higher_than_11mbit)
756                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
757         else
758                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
759
760         ieee80211_set_wmm_default(sdata);
761 }
762
763 void ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
764                       int encrypt)
765 {
766         skb->dev = sdata->local->mdev;
767         skb_set_mac_header(skb, 0);
768         skb_set_network_header(skb, 0);
769         skb_set_transport_header(skb, 0);
770
771         skb->iif = sdata->dev->ifindex;
772         skb->do_not_encrypt = !encrypt;
773
774         dev_queue_xmit(skb);
775 }
776
777 int ieee80211_set_freq(struct ieee80211_sub_if_data *sdata, int freqMHz)
778 {
779         int ret = -EINVAL;
780         struct ieee80211_channel *chan;
781         struct ieee80211_local *local = sdata->local;
782
783         chan = ieee80211_get_channel(local->hw.wiphy, freqMHz);
784
785         if (chan && !(chan->flags & IEEE80211_CHAN_DISABLED)) {
786                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
787                     chan->flags & IEEE80211_CHAN_NO_IBSS)
788                         return ret;
789                 local->oper_channel = chan;
790                 local->oper_channel_type = NL80211_CHAN_NO_HT;
791
792                 if (local->sw_scanning || local->hw_scanning)
793                         ret = 0;
794                 else
795                         ret = ieee80211_hw_config(
796                                 local, IEEE80211_CONF_CHANGE_CHANNEL);
797         }
798
799         return ret;
800 }
801
802 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
803                               enum ieee80211_band band)
804 {
805         struct ieee80211_supported_band *sband;
806         struct ieee80211_rate *bitrates;
807         u32 mandatory_rates;
808         enum ieee80211_rate_flags mandatory_flag;
809         int i;
810
811         sband = local->hw.wiphy->bands[band];
812         if (!sband) {
813                 WARN_ON(1);
814                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
815         }
816
817         if (band == IEEE80211_BAND_2GHZ)
818                 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
819         else
820                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
821
822         bitrates = sband->bitrates;
823         mandatory_rates = 0;
824         for (i = 0; i < sband->n_bitrates; i++)
825                 if (bitrates[i].flags & mandatory_flag)
826                         mandatory_rates |= BIT(i);
827         return mandatory_rates;
828 }
829
830 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
831                          u16 transaction, u16 auth_alg,
832                          u8 *extra, size_t extra_len,
833                          const u8 *bssid, int encrypt)
834 {
835         struct ieee80211_local *local = sdata->local;
836         struct sk_buff *skb;
837         struct ieee80211_mgmt *mgmt;
838
839         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
840                             sizeof(*mgmt) + 6 + extra_len);
841         if (!skb) {
842                 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
843                        "frame\n", sdata->dev->name);
844                 return;
845         }
846         skb_reserve(skb, local->hw.extra_tx_headroom);
847
848         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
849         memset(mgmt, 0, 24 + 6);
850         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
851                                           IEEE80211_STYPE_AUTH);
852         if (encrypt)
853                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
854         memcpy(mgmt->da, bssid, ETH_ALEN);
855         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
856         memcpy(mgmt->bssid, bssid, ETH_ALEN);
857         mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
858         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
859         mgmt->u.auth.status_code = cpu_to_le16(0);
860         if (extra)
861                 memcpy(skb_put(skb, extra_len), extra, extra_len);
862
863         ieee80211_tx_skb(sdata, skb, encrypt);
864 }
865
866 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
867                              const u8 *ie, size_t ie_len)
868 {
869         struct ieee80211_supported_band *sband;
870         u8 *pos, *supp_rates_len, *esupp_rates_len = NULL;
871         int i;
872
873         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
874
875         pos = buffer;
876
877         *pos++ = WLAN_EID_SUPP_RATES;
878         supp_rates_len = pos;
879         *pos++ = 0;
880
881         for (i = 0; i < sband->n_bitrates; i++) {
882                 struct ieee80211_rate *rate = &sband->bitrates[i];
883
884                 if (esupp_rates_len) {
885                         *esupp_rates_len += 1;
886                 } else if (*supp_rates_len == 8) {
887                         *pos++ = WLAN_EID_EXT_SUPP_RATES;
888                         esupp_rates_len = pos;
889                         *pos++ = 1;
890                 } else
891                         *supp_rates_len += 1;
892
893                 *pos++ = rate->bitrate / 5;
894         }
895
896         if (sband->ht_cap.ht_supported) {
897                 __le16 tmp = cpu_to_le16(sband->ht_cap.cap);
898
899                 *pos++ = WLAN_EID_HT_CAPABILITY;
900                 *pos++ = sizeof(struct ieee80211_ht_cap);
901                 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
902                 memcpy(pos, &tmp, sizeof(u16));
903                 pos += sizeof(u16);
904                 /* TODO: needs a define here for << 2 */
905                 *pos++ = sband->ht_cap.ampdu_factor |
906                          (sband->ht_cap.ampdu_density << 2);
907                 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
908                 pos += sizeof(sband->ht_cap.mcs);
909                 pos += 2 + 4 + 1; /* ext info, BF cap, antsel */
910         }
911
912         /*
913          * If adding more here, adjust code in main.c
914          * that calculates local->scan_ies_len.
915          */
916
917         if (ie) {
918                 memcpy(pos, ie, ie_len);
919                 pos += ie_len;
920         }
921
922         return pos - buffer;
923 }
924
925 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
926                               const u8 *ssid, size_t ssid_len,
927                               const u8 *ie, size_t ie_len)
928 {
929         struct ieee80211_local *local = sdata->local;
930         struct sk_buff *skb;
931         struct ieee80211_mgmt *mgmt;
932         u8 *pos;
933
934         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200 +
935                             ie_len);
936         if (!skb) {
937                 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
938                        "request\n", sdata->dev->name);
939                 return;
940         }
941         skb_reserve(skb, local->hw.extra_tx_headroom);
942
943         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
944         memset(mgmt, 0, 24);
945         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
946                                           IEEE80211_STYPE_PROBE_REQ);
947         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
948         if (dst) {
949                 memcpy(mgmt->da, dst, ETH_ALEN);
950                 memcpy(mgmt->bssid, dst, ETH_ALEN);
951         } else {
952                 memset(mgmt->da, 0xff, ETH_ALEN);
953                 memset(mgmt->bssid, 0xff, ETH_ALEN);
954         }
955         pos = skb_put(skb, 2 + ssid_len);
956         *pos++ = WLAN_EID_SSID;
957         *pos++ = ssid_len;
958         memcpy(pos, ssid, ssid_len);
959         pos += ssid_len;
960
961         skb_put(skb, ieee80211_build_preq_ies(local, pos, ie, ie_len));
962
963         ieee80211_tx_skb(sdata, skb, 0);
964 }
965
966 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
967                             struct ieee802_11_elems *elems,
968                             enum ieee80211_band band)
969 {
970         struct ieee80211_supported_band *sband;
971         struct ieee80211_rate *bitrates;
972         size_t num_rates;
973         u32 supp_rates;
974         int i, j;
975         sband = local->hw.wiphy->bands[band];
976
977         if (!sband) {
978                 WARN_ON(1);
979                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
980         }
981
982         bitrates = sband->bitrates;
983         num_rates = sband->n_bitrates;
984         supp_rates = 0;
985         for (i = 0; i < elems->supp_rates_len +
986                      elems->ext_supp_rates_len; i++) {
987                 u8 rate = 0;
988                 int own_rate;
989                 if (i < elems->supp_rates_len)
990                         rate = elems->supp_rates[i];
991                 else if (elems->ext_supp_rates)
992                         rate = elems->ext_supp_rates
993                                 [i - elems->supp_rates_len];
994                 own_rate = 5 * (rate & 0x7f);
995                 for (j = 0; j < num_rates; j++)
996                         if (bitrates[j].bitrate == own_rate)
997                                 supp_rates |= BIT(j);
998         }
999         return supp_rates;
1000 }
1001
1002 int ieee80211_reconfig(struct ieee80211_local *local)
1003 {
1004         struct ieee80211_hw *hw = &local->hw;
1005         struct ieee80211_sub_if_data *sdata;
1006         struct ieee80211_if_init_conf conf;
1007         struct sta_info *sta;
1008         unsigned long flags;
1009         int res;
1010         bool from_suspend = local->suspended;
1011
1012         /*
1013          * We're going to start the hardware, at that point
1014          * we are no longer suspended and can RX frames.
1015          */
1016         local->suspended = false;
1017
1018         /* restart hardware */
1019         if (local->open_count) {
1020                 res = drv_start(local);
1021
1022                 ieee80211_led_radio(local, true);
1023         }
1024
1025         /* add interfaces */
1026         list_for_each_entry(sdata, &local->interfaces, list) {
1027                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1028                     sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1029                     netif_running(sdata->dev)) {
1030                         conf.vif = &sdata->vif;
1031                         conf.type = sdata->vif.type;
1032                         conf.mac_addr = sdata->dev->dev_addr;
1033                         res = drv_add_interface(local, &conf);
1034                 }
1035         }
1036
1037         /* add STAs back */
1038         if (local->ops->sta_notify) {
1039                 spin_lock_irqsave(&local->sta_lock, flags);
1040                 list_for_each_entry(sta, &local->sta_list, list) {
1041                         sdata = sta->sdata;
1042                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1043                                 sdata = container_of(sdata->bss,
1044                                              struct ieee80211_sub_if_data,
1045                                              u.ap);
1046
1047                         drv_sta_notify(local, &sdata->vif, STA_NOTIFY_ADD,
1048                                        &sta->sta);
1049                 }
1050                 spin_unlock_irqrestore(&local->sta_lock, flags);
1051         }
1052
1053         /* Clear Suspend state so that ADDBA requests can be processed */
1054
1055         rcu_read_lock();
1056
1057         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1058                 list_for_each_entry_rcu(sta, &local->sta_list, list) {
1059                         clear_sta_flags(sta, WLAN_STA_SUSPEND);
1060                 }
1061         }
1062
1063         rcu_read_unlock();
1064
1065         /* setup RTS threshold */
1066         drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1067
1068         /* reconfigure hardware */
1069         ieee80211_hw_config(local, ~0);
1070
1071         netif_addr_lock_bh(local->mdev);
1072         ieee80211_configure_filter(local);
1073         netif_addr_unlock_bh(local->mdev);
1074
1075         /* Finally also reconfigure all the BSS information */
1076         list_for_each_entry(sdata, &local->interfaces, list) {
1077                 u32 changed = ~0;
1078                 if (!netif_running(sdata->dev))
1079                         continue;
1080                 switch (sdata->vif.type) {
1081                 case NL80211_IFTYPE_STATION:
1082                         /* disable beacon change bits */
1083                         changed &= ~(BSS_CHANGED_BEACON |
1084                                      BSS_CHANGED_BEACON_ENABLED);
1085                         /* fall through */
1086                 case NL80211_IFTYPE_ADHOC:
1087                 case NL80211_IFTYPE_AP:
1088                 case NL80211_IFTYPE_MESH_POINT:
1089                         ieee80211_bss_info_change_notify(sdata, changed);
1090                         break;
1091                 case NL80211_IFTYPE_WDS:
1092                         break;
1093                 case NL80211_IFTYPE_AP_VLAN:
1094                 case NL80211_IFTYPE_MONITOR:
1095                         /* ignore virtual */
1096                         break;
1097                 case NL80211_IFTYPE_UNSPECIFIED:
1098                 case __NL80211_IFTYPE_AFTER_LAST:
1099                         WARN_ON(1);
1100                         break;
1101                 }
1102         }
1103
1104         /* add back keys */
1105         list_for_each_entry(sdata, &local->interfaces, list)
1106                 if (netif_running(sdata->dev))
1107                         ieee80211_enable_keys(sdata);
1108
1109         ieee80211_wake_queues_by_reason(hw,
1110                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1111
1112         /*
1113          * If this is for hw restart things are still running.
1114          * We may want to change that later, however.
1115          */
1116         if (!from_suspend)
1117                 return 0;
1118
1119 #ifdef CONFIG_PM
1120         local->suspended = false;
1121
1122         list_for_each_entry(sdata, &local->interfaces, list) {
1123                 switch(sdata->vif.type) {
1124                 case NL80211_IFTYPE_STATION:
1125                         ieee80211_sta_restart(sdata);
1126                         break;
1127                 case NL80211_IFTYPE_ADHOC:
1128                         ieee80211_ibss_restart(sdata);
1129                         break;
1130                 case NL80211_IFTYPE_MESH_POINT:
1131                         ieee80211_mesh_restart(sdata);
1132                         break;
1133                 default:
1134                         break;
1135                 }
1136         }
1137
1138         add_timer(&local->sta_cleanup);
1139
1140         spin_lock_irqsave(&local->sta_lock, flags);
1141         list_for_each_entry(sta, &local->sta_list, list)
1142                 mesh_plink_restart(sta);
1143         spin_unlock_irqrestore(&local->sta_lock, flags);
1144 #else
1145         WARN_ON(1);
1146 #endif
1147         return 0;
1148 }