nl80211: Send timeout event on failed direct probe
[linux-2.6] / 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 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
39 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
40 const unsigned char rfc1042_header[] __aligned(2) =
41         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
42
43 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
44 const unsigned char bridge_tunnel_header[] __aligned(2) =
45         { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
46
47 struct ieee80211_hw *wiphy_to_ieee80211_hw(struct wiphy *wiphy)
48 {
49         struct ieee80211_local *local;
50         BUG_ON(!wiphy);
51
52         local = wiphy_priv(wiphy);
53         return &local->hw;
54 }
55 EXPORT_SYMBOL(wiphy_to_ieee80211_hw);
56
57 u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
58                         enum nl80211_iftype type)
59 {
60         __le16 fc = hdr->frame_control;
61
62          /* drop ACK/CTS frames and incorrect hdr len (ctrl) */
63         if (len < 16)
64                 return NULL;
65
66         if (ieee80211_is_data(fc)) {
67                 if (len < 24) /* drop incorrect hdr len (data) */
68                         return NULL;
69
70                 if (ieee80211_has_a4(fc))
71                         return NULL;
72                 if (ieee80211_has_tods(fc))
73                         return hdr->addr1;
74                 if (ieee80211_has_fromds(fc))
75                         return hdr->addr2;
76
77                 return hdr->addr3;
78         }
79
80         if (ieee80211_is_mgmt(fc)) {
81                 if (len < 24) /* drop incorrect hdr len (mgmt) */
82                         return NULL;
83                 return hdr->addr3;
84         }
85
86         if (ieee80211_is_ctl(fc)) {
87                 if(ieee80211_is_pspoll(fc))
88                         return hdr->addr1;
89
90                 if (ieee80211_is_back_req(fc)) {
91                         switch (type) {
92                         case NL80211_IFTYPE_STATION:
93                                 return hdr->addr2;
94                         case NL80211_IFTYPE_AP:
95                         case NL80211_IFTYPE_AP_VLAN:
96                                 return hdr->addr1;
97                         default:
98                                 break; /* fall through to the return */
99                         }
100                 }
101         }
102
103         return NULL;
104 }
105
106 unsigned int ieee80211_hdrlen(__le16 fc)
107 {
108         unsigned int hdrlen = 24;
109
110         if (ieee80211_is_data(fc)) {
111                 if (ieee80211_has_a4(fc))
112                         hdrlen = 30;
113                 if (ieee80211_is_data_qos(fc))
114                         hdrlen += IEEE80211_QOS_CTL_LEN;
115                 goto out;
116         }
117
118         if (ieee80211_is_ctl(fc)) {
119                 /*
120                  * ACK and CTS are 10 bytes, all others 16. To see how
121                  * to get this condition consider
122                  *   subtype mask:   0b0000000011110000 (0x00F0)
123                  *   ACK subtype:    0b0000000011010000 (0x00D0)
124                  *   CTS subtype:    0b0000000011000000 (0x00C0)
125                  *   bits that matter:         ^^^      (0x00E0)
126                  *   value of those: 0b0000000011000000 (0x00C0)
127                  */
128                 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
129                         hdrlen = 10;
130                 else
131                         hdrlen = 16;
132         }
133 out:
134         return hdrlen;
135 }
136 EXPORT_SYMBOL(ieee80211_hdrlen);
137
138 unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
139 {
140         const struct ieee80211_hdr *hdr = (const struct ieee80211_hdr *)skb->data;
141         unsigned int hdrlen;
142
143         if (unlikely(skb->len < 10))
144                 return 0;
145         hdrlen = ieee80211_hdrlen(hdr->frame_control);
146         if (unlikely(hdrlen > skb->len))
147                 return 0;
148         return hdrlen;
149 }
150 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
151
152 int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
153 {
154         int ae = meshhdr->flags & IEEE80211S_FLAGS_AE;
155         /* 7.1.3.5a.2 */
156         switch (ae) {
157         case 0:
158                 return 6;
159         case 1:
160                 return 12;
161         case 2:
162                 return 18;
163         case 3:
164                 return 24;
165         default:
166                 return 6;
167         }
168 }
169
170 void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
171 {
172         struct sk_buff *skb = tx->skb;
173         struct ieee80211_hdr *hdr;
174
175         do {
176                 hdr = (struct ieee80211_hdr *) skb->data;
177                 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
178         } while ((skb = skb->next));
179 }
180
181 int ieee80211_frame_duration(struct ieee80211_local *local, size_t len,
182                              int rate, int erp, int short_preamble)
183 {
184         int dur;
185
186         /* calculate duration (in microseconds, rounded up to next higher
187          * integer if it includes a fractional microsecond) to send frame of
188          * len bytes (does not include FCS) at the given rate. Duration will
189          * also include SIFS.
190          *
191          * rate is in 100 kbps, so divident is multiplied by 10 in the
192          * DIV_ROUND_UP() operations.
193          */
194
195         if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ || erp) {
196                 /*
197                  * OFDM:
198                  *
199                  * N_DBPS = DATARATE x 4
200                  * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
201                  *      (16 = SIGNAL time, 6 = tail bits)
202                  * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
203                  *
204                  * T_SYM = 4 usec
205                  * 802.11a - 17.5.2: aSIFSTime = 16 usec
206                  * 802.11g - 19.8.4: aSIFSTime = 10 usec +
207                  *      signal ext = 6 usec
208                  */
209                 dur = 16; /* SIFS + signal ext */
210                 dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */
211                 dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */
212                 dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
213                                         4 * rate); /* T_SYM x N_SYM */
214         } else {
215                 /*
216                  * 802.11b or 802.11g with 802.11b compatibility:
217                  * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
218                  * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
219                  *
220                  * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
221                  * aSIFSTime = 10 usec
222                  * aPreambleLength = 144 usec or 72 usec with short preamble
223                  * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
224                  */
225                 dur = 10; /* aSIFSTime = 10 usec */
226                 dur += short_preamble ? (72 + 24) : (144 + 48);
227
228                 dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
229         }
230
231         return dur;
232 }
233
234 /* Exported duration function for driver use */
235 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
236                                         struct ieee80211_vif *vif,
237                                         size_t frame_len,
238                                         struct ieee80211_rate *rate)
239 {
240         struct ieee80211_local *local = hw_to_local(hw);
241         struct ieee80211_sub_if_data *sdata;
242         u16 dur;
243         int erp;
244         bool short_preamble = false;
245
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         dur = ieee80211_frame_duration(local, frame_len, rate->bitrate, erp,
255                                        short_preamble);
256
257         return cpu_to_le16(dur);
258 }
259 EXPORT_SYMBOL(ieee80211_generic_frame_duration);
260
261 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
262                               struct ieee80211_vif *vif, size_t frame_len,
263                               const struct ieee80211_tx_info *frame_txctl)
264 {
265         struct ieee80211_local *local = hw_to_local(hw);
266         struct ieee80211_rate *rate;
267         struct ieee80211_sub_if_data *sdata;
268         bool short_preamble;
269         int erp;
270         u16 dur;
271         struct ieee80211_supported_band *sband;
272
273         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
274
275         short_preamble = false;
276
277         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
278
279         erp = 0;
280         if (vif) {
281                 sdata = vif_to_sdata(vif);
282                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
283                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
284                         erp = rate->flags & IEEE80211_RATE_ERP_G;
285         }
286
287         /* CTS duration */
288         dur = ieee80211_frame_duration(local, 10, rate->bitrate,
289                                        erp, short_preamble);
290         /* Data frame duration */
291         dur += ieee80211_frame_duration(local, frame_len, rate->bitrate,
292                                         erp, short_preamble);
293         /* ACK duration */
294         dur += ieee80211_frame_duration(local, 10, rate->bitrate,
295                                         erp, short_preamble);
296
297         return cpu_to_le16(dur);
298 }
299 EXPORT_SYMBOL(ieee80211_rts_duration);
300
301 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
302                                     struct ieee80211_vif *vif,
303                                     size_t frame_len,
304                                     const struct ieee80211_tx_info *frame_txctl)
305 {
306         struct ieee80211_local *local = hw_to_local(hw);
307         struct ieee80211_rate *rate;
308         struct ieee80211_sub_if_data *sdata;
309         bool short_preamble;
310         int erp;
311         u16 dur;
312         struct ieee80211_supported_band *sband;
313
314         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
315
316         short_preamble = false;
317
318         rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
319         erp = 0;
320         if (vif) {
321                 sdata = vif_to_sdata(vif);
322                 short_preamble = sdata->vif.bss_conf.use_short_preamble;
323                 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
324                         erp = rate->flags & IEEE80211_RATE_ERP_G;
325         }
326
327         /* Data frame duration */
328         dur = ieee80211_frame_duration(local, frame_len, rate->bitrate,
329                                        erp, short_preamble);
330         if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
331                 /* ACK duration */
332                 dur += ieee80211_frame_duration(local, 10, rate->bitrate,
333                                                 erp, short_preamble);
334         }
335
336         return cpu_to_le16(dur);
337 }
338 EXPORT_SYMBOL(ieee80211_ctstoself_duration);
339
340 static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
341                                    enum queue_stop_reason reason)
342 {
343         struct ieee80211_local *local = hw_to_local(hw);
344
345         if (WARN_ON(queue >= hw->queues))
346                 return;
347
348         __clear_bit(reason, &local->queue_stop_reasons[queue]);
349
350         if (!skb_queue_empty(&local->pending[queue]) &&
351             local->queue_stop_reasons[queue] ==
352                                 BIT(IEEE80211_QUEUE_STOP_REASON_PENDING))
353                 tasklet_schedule(&local->tx_pending_tasklet);
354
355         if (local->queue_stop_reasons[queue] != 0)
356                 /* someone still has this queue stopped */
357                 return;
358
359         netif_wake_subqueue(local->mdev, queue);
360 }
361
362 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
363                                     enum queue_stop_reason reason)
364 {
365         struct ieee80211_local *local = hw_to_local(hw);
366         unsigned long flags;
367
368         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
369         __ieee80211_wake_queue(hw, queue, reason);
370         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
371 }
372
373 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
374 {
375         ieee80211_wake_queue_by_reason(hw, queue,
376                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
377 }
378 EXPORT_SYMBOL(ieee80211_wake_queue);
379
380 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
381                                    enum queue_stop_reason reason)
382 {
383         struct ieee80211_local *local = hw_to_local(hw);
384
385         if (WARN_ON(queue >= hw->queues))
386                 return;
387
388         /*
389          * Only stop if it was previously running, this is necessary
390          * for correct pending packets handling because there we may
391          * start (but not wake) the queue and rely on that.
392          */
393         if (!local->queue_stop_reasons[queue])
394                 netif_stop_subqueue(local->mdev, queue);
395
396         __set_bit(reason, &local->queue_stop_reasons[queue]);
397 }
398
399 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
400                                     enum queue_stop_reason reason)
401 {
402         struct ieee80211_local *local = hw_to_local(hw);
403         unsigned long flags;
404
405         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
406         __ieee80211_stop_queue(hw, queue, reason);
407         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
408 }
409
410 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
411 {
412         ieee80211_stop_queue_by_reason(hw, queue,
413                                        IEEE80211_QUEUE_STOP_REASON_DRIVER);
414 }
415 EXPORT_SYMBOL(ieee80211_stop_queue);
416
417 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
418                                     enum queue_stop_reason reason)
419 {
420         struct ieee80211_local *local = hw_to_local(hw);
421         unsigned long flags;
422         int i;
423
424         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
425
426         for (i = 0; i < hw->queues; i++)
427                 __ieee80211_stop_queue(hw, i, reason);
428
429         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
430 }
431
432 void ieee80211_stop_queues(struct ieee80211_hw *hw)
433 {
434         ieee80211_stop_queues_by_reason(hw,
435                                         IEEE80211_QUEUE_STOP_REASON_DRIVER);
436 }
437 EXPORT_SYMBOL(ieee80211_stop_queues);
438
439 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
440 {
441         struct ieee80211_local *local = hw_to_local(hw);
442
443         if (WARN_ON(queue >= hw->queues))
444                 return true;
445
446         return __netif_subqueue_stopped(local->mdev, queue);
447 }
448 EXPORT_SYMBOL(ieee80211_queue_stopped);
449
450 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
451                                      enum queue_stop_reason reason)
452 {
453         struct ieee80211_local *local = hw_to_local(hw);
454         unsigned long flags;
455         int i;
456
457         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
458
459         for (i = 0; i < hw->queues; i++)
460                 __ieee80211_wake_queue(hw, i, reason);
461
462         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
463 }
464
465 void ieee80211_wake_queues(struct ieee80211_hw *hw)
466 {
467         ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
468 }
469 EXPORT_SYMBOL(ieee80211_wake_queues);
470
471 void ieee80211_iterate_active_interfaces(
472         struct ieee80211_hw *hw,
473         void (*iterator)(void *data, u8 *mac,
474                          struct ieee80211_vif *vif),
475         void *data)
476 {
477         struct ieee80211_local *local = hw_to_local(hw);
478         struct ieee80211_sub_if_data *sdata;
479
480         mutex_lock(&local->iflist_mtx);
481
482         list_for_each_entry(sdata, &local->interfaces, list) {
483                 switch (sdata->vif.type) {
484                 case __NL80211_IFTYPE_AFTER_LAST:
485                 case NL80211_IFTYPE_UNSPECIFIED:
486                 case NL80211_IFTYPE_MONITOR:
487                 case NL80211_IFTYPE_AP_VLAN:
488                         continue;
489                 case NL80211_IFTYPE_AP:
490                 case NL80211_IFTYPE_STATION:
491                 case NL80211_IFTYPE_ADHOC:
492                 case NL80211_IFTYPE_WDS:
493                 case NL80211_IFTYPE_MESH_POINT:
494                         break;
495                 }
496                 if (netif_running(sdata->dev))
497                         iterator(data, sdata->dev->dev_addr,
498                                  &sdata->vif);
499         }
500
501         mutex_unlock(&local->iflist_mtx);
502 }
503 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
504
505 void ieee80211_iterate_active_interfaces_atomic(
506         struct ieee80211_hw *hw,
507         void (*iterator)(void *data, u8 *mac,
508                          struct ieee80211_vif *vif),
509         void *data)
510 {
511         struct ieee80211_local *local = hw_to_local(hw);
512         struct ieee80211_sub_if_data *sdata;
513
514         rcu_read_lock();
515
516         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
517                 switch (sdata->vif.type) {
518                 case __NL80211_IFTYPE_AFTER_LAST:
519                 case NL80211_IFTYPE_UNSPECIFIED:
520                 case NL80211_IFTYPE_MONITOR:
521                 case NL80211_IFTYPE_AP_VLAN:
522                         continue;
523                 case NL80211_IFTYPE_AP:
524                 case NL80211_IFTYPE_STATION:
525                 case NL80211_IFTYPE_ADHOC:
526                 case NL80211_IFTYPE_WDS:
527                 case NL80211_IFTYPE_MESH_POINT:
528                         break;
529                 }
530                 if (netif_running(sdata->dev))
531                         iterator(data, sdata->dev->dev_addr,
532                                  &sdata->vif);
533         }
534
535         rcu_read_unlock();
536 }
537 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
538
539 void ieee802_11_parse_elems(u8 *start, size_t len,
540                             struct ieee802_11_elems *elems)
541 {
542         ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
543 }
544
545 u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
546                                struct ieee802_11_elems *elems,
547                                u64 filter, u32 crc)
548 {
549         size_t left = len;
550         u8 *pos = start;
551         bool calc_crc = filter != 0;
552
553         memset(elems, 0, sizeof(*elems));
554         elems->ie_start = start;
555         elems->total_len = len;
556
557         while (left >= 2) {
558                 u8 id, elen;
559
560                 id = *pos++;
561                 elen = *pos++;
562                 left -= 2;
563
564                 if (elen > left)
565                         break;
566
567                 if (calc_crc && id < 64 && (filter & BIT(id)))
568                         crc = crc32_be(crc, pos - 2, elen + 2);
569
570                 switch (id) {
571                 case WLAN_EID_SSID:
572                         elems->ssid = pos;
573                         elems->ssid_len = elen;
574                         break;
575                 case WLAN_EID_SUPP_RATES:
576                         elems->supp_rates = pos;
577                         elems->supp_rates_len = elen;
578                         break;
579                 case WLAN_EID_FH_PARAMS:
580                         elems->fh_params = pos;
581                         elems->fh_params_len = elen;
582                         break;
583                 case WLAN_EID_DS_PARAMS:
584                         elems->ds_params = pos;
585                         elems->ds_params_len = elen;
586                         break;
587                 case WLAN_EID_CF_PARAMS:
588                         elems->cf_params = pos;
589                         elems->cf_params_len = elen;
590                         break;
591                 case WLAN_EID_TIM:
592                         if (elen >= sizeof(struct ieee80211_tim_ie)) {
593                                 elems->tim = (void *)pos;
594                                 elems->tim_len = elen;
595                         }
596                         break;
597                 case WLAN_EID_IBSS_PARAMS:
598                         elems->ibss_params = pos;
599                         elems->ibss_params_len = elen;
600                         break;
601                 case WLAN_EID_CHALLENGE:
602                         elems->challenge = pos;
603                         elems->challenge_len = elen;
604                         break;
605                 case WLAN_EID_VENDOR_SPECIFIC:
606                         if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
607                             pos[2] == 0xf2) {
608                                 /* Microsoft OUI (00:50:F2) */
609
610                                 if (calc_crc)
611                                         crc = crc32_be(crc, pos - 2, elen + 2);
612
613                                 if (pos[3] == 1) {
614                                         /* OUI Type 1 - WPA IE */
615                                         elems->wpa = pos;
616                                         elems->wpa_len = elen;
617                                 } else if (elen >= 5 && pos[3] == 2) {
618                                         /* OUI Type 2 - WMM IE */
619                                         if (pos[4] == 0) {
620                                                 elems->wmm_info = pos;
621                                                 elems->wmm_info_len = elen;
622                                         } else if (pos[4] == 1) {
623                                                 elems->wmm_param = pos;
624                                                 elems->wmm_param_len = elen;
625                                         }
626                                 }
627                         }
628                         break;
629                 case WLAN_EID_RSN:
630                         elems->rsn = pos;
631                         elems->rsn_len = elen;
632                         break;
633                 case WLAN_EID_ERP_INFO:
634                         elems->erp_info = pos;
635                         elems->erp_info_len = elen;
636                         break;
637                 case WLAN_EID_EXT_SUPP_RATES:
638                         elems->ext_supp_rates = pos;
639                         elems->ext_supp_rates_len = elen;
640                         break;
641                 case WLAN_EID_HT_CAPABILITY:
642                         if (elen >= sizeof(struct ieee80211_ht_cap))
643                                 elems->ht_cap_elem = (void *)pos;
644                         break;
645                 case WLAN_EID_HT_INFORMATION:
646                         if (elen >= sizeof(struct ieee80211_ht_info))
647                                 elems->ht_info_elem = (void *)pos;
648                         break;
649                 case WLAN_EID_MESH_ID:
650                         elems->mesh_id = pos;
651                         elems->mesh_id_len = elen;
652                         break;
653                 case WLAN_EID_MESH_CONFIG:
654                         elems->mesh_config = pos;
655                         elems->mesh_config_len = elen;
656                         break;
657                 case WLAN_EID_PEER_LINK:
658                         elems->peer_link = pos;
659                         elems->peer_link_len = elen;
660                         break;
661                 case WLAN_EID_PREQ:
662                         elems->preq = pos;
663                         elems->preq_len = elen;
664                         break;
665                 case WLAN_EID_PREP:
666                         elems->prep = pos;
667                         elems->prep_len = elen;
668                         break;
669                 case WLAN_EID_PERR:
670                         elems->perr = pos;
671                         elems->perr_len = elen;
672                         break;
673                 case WLAN_EID_CHANNEL_SWITCH:
674                         elems->ch_switch_elem = pos;
675                         elems->ch_switch_elem_len = elen;
676                         break;
677                 case WLAN_EID_QUIET:
678                         if (!elems->quiet_elem) {
679                                 elems->quiet_elem = pos;
680                                 elems->quiet_elem_len = elen;
681                         }
682                         elems->num_of_quiet_elem++;
683                         break;
684                 case WLAN_EID_COUNTRY:
685                         elems->country_elem = pos;
686                         elems->country_elem_len = elen;
687                         break;
688                 case WLAN_EID_PWR_CONSTRAINT:
689                         elems->pwr_constr_elem = pos;
690                         elems->pwr_constr_elem_len = elen;
691                         break;
692                 case WLAN_EID_TIMEOUT_INTERVAL:
693                         elems->timeout_int = pos;
694                         elems->timeout_int_len = elen;
695                         break;
696                 default:
697                         break;
698                 }
699
700                 left -= elen;
701                 pos += elen;
702         }
703
704         return crc;
705 }
706
707 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata)
708 {
709         struct ieee80211_local *local = sdata->local;
710         struct ieee80211_tx_queue_params qparam;
711         int i;
712
713         if (!local->ops->conf_tx)
714                 return;
715
716         memset(&qparam, 0, sizeof(qparam));
717
718         qparam.aifs = 2;
719
720         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
721             !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE))
722                 qparam.cw_min = 31;
723         else
724                 qparam.cw_min = 15;
725
726         qparam.cw_max = 1023;
727         qparam.txop = 0;
728
729         for (i = 0; i < local_to_hw(local)->queues; i++)
730                 drv_conf_tx(local, i, &qparam);
731 }
732
733 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
734                                   const size_t supp_rates_len,
735                                   const u8 *supp_rates)
736 {
737         struct ieee80211_local *local = sdata->local;
738         int i, have_higher_than_11mbit = 0;
739
740         /* cf. IEEE 802.11 9.2.12 */
741         for (i = 0; i < supp_rates_len; i++)
742                 if ((supp_rates[i] & 0x7f) * 5 > 110)
743                         have_higher_than_11mbit = 1;
744
745         if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
746             have_higher_than_11mbit)
747                 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
748         else
749                 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
750
751         ieee80211_set_wmm_default(sdata);
752 }
753
754 void ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
755                       int encrypt)
756 {
757         skb->dev = sdata->local->mdev;
758         skb_set_mac_header(skb, 0);
759         skb_set_network_header(skb, 0);
760         skb_set_transport_header(skb, 0);
761
762         skb->iif = sdata->dev->ifindex;
763         skb->do_not_encrypt = !encrypt;
764
765         dev_queue_xmit(skb);
766 }
767
768 int ieee80211_set_freq(struct ieee80211_sub_if_data *sdata, int freqMHz)
769 {
770         int ret = -EINVAL;
771         struct ieee80211_channel *chan;
772         struct ieee80211_local *local = sdata->local;
773
774         chan = ieee80211_get_channel(local->hw.wiphy, freqMHz);
775
776         if (chan && !(chan->flags & IEEE80211_CHAN_DISABLED)) {
777                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
778                     chan->flags & IEEE80211_CHAN_NO_IBSS)
779                         return ret;
780                 local->oper_channel = chan;
781                 local->oper_channel_type = NL80211_CHAN_NO_HT;
782
783                 if (local->sw_scanning || local->hw_scanning)
784                         ret = 0;
785                 else
786                         ret = ieee80211_hw_config(
787                                 local, IEEE80211_CONF_CHANGE_CHANNEL);
788         }
789
790         return ret;
791 }
792
793 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
794                               enum ieee80211_band band)
795 {
796         struct ieee80211_supported_band *sband;
797         struct ieee80211_rate *bitrates;
798         u32 mandatory_rates;
799         enum ieee80211_rate_flags mandatory_flag;
800         int i;
801
802         sband = local->hw.wiphy->bands[band];
803         if (!sband) {
804                 WARN_ON(1);
805                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
806         }
807
808         if (band == IEEE80211_BAND_2GHZ)
809                 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
810         else
811                 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
812
813         bitrates = sband->bitrates;
814         mandatory_rates = 0;
815         for (i = 0; i < sband->n_bitrates; i++)
816                 if (bitrates[i].flags & mandatory_flag)
817                         mandatory_rates |= BIT(i);
818         return mandatory_rates;
819 }
820
821 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
822                          u16 transaction, u16 auth_alg,
823                          u8 *extra, size_t extra_len,
824                          const u8 *bssid, int encrypt)
825 {
826         struct ieee80211_local *local = sdata->local;
827         struct sk_buff *skb;
828         struct ieee80211_mgmt *mgmt;
829
830         skb = dev_alloc_skb(local->hw.extra_tx_headroom +
831                             sizeof(*mgmt) + 6 + extra_len);
832         if (!skb) {
833                 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
834                        "frame\n", sdata->dev->name);
835                 return;
836         }
837         skb_reserve(skb, local->hw.extra_tx_headroom);
838
839         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
840         memset(mgmt, 0, 24 + 6);
841         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
842                                           IEEE80211_STYPE_AUTH);
843         if (encrypt)
844                 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
845         memcpy(mgmt->da, bssid, ETH_ALEN);
846         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
847         memcpy(mgmt->bssid, bssid, ETH_ALEN);
848         mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
849         mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
850         mgmt->u.auth.status_code = cpu_to_le16(0);
851         if (extra)
852                 memcpy(skb_put(skb, extra_len), extra, extra_len);
853
854         ieee80211_tx_skb(sdata, skb, encrypt);
855 }
856
857 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
858                              const u8 *ie, size_t ie_len)
859 {
860         struct ieee80211_supported_band *sband;
861         u8 *pos, *supp_rates_len, *esupp_rates_len = NULL;
862         int i;
863
864         sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
865
866         pos = buffer;
867
868         *pos++ = WLAN_EID_SUPP_RATES;
869         supp_rates_len = pos;
870         *pos++ = 0;
871
872         for (i = 0; i < sband->n_bitrates; i++) {
873                 struct ieee80211_rate *rate = &sband->bitrates[i];
874
875                 if (esupp_rates_len) {
876                         *esupp_rates_len += 1;
877                 } else if (*supp_rates_len == 8) {
878                         *pos++ = WLAN_EID_EXT_SUPP_RATES;
879                         esupp_rates_len = pos;
880                         *pos++ = 1;
881                 } else
882                         *supp_rates_len += 1;
883
884                 *pos++ = rate->bitrate / 5;
885         }
886
887         if (sband->ht_cap.ht_supported) {
888                 __le16 tmp = cpu_to_le16(sband->ht_cap.cap);
889
890                 *pos++ = WLAN_EID_HT_CAPABILITY;
891                 *pos++ = sizeof(struct ieee80211_ht_cap);
892                 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
893                 memcpy(pos, &tmp, sizeof(u16));
894                 pos += sizeof(u16);
895                 /* TODO: needs a define here for << 2 */
896                 *pos++ = sband->ht_cap.ampdu_factor |
897                          (sband->ht_cap.ampdu_density << 2);
898                 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
899                 pos += sizeof(sband->ht_cap.mcs);
900                 pos += 2 + 4 + 1; /* ext info, BF cap, antsel */
901         }
902
903         /*
904          * If adding more here, adjust code in main.c
905          * that calculates local->scan_ies_len.
906          */
907
908         if (ie) {
909                 memcpy(pos, ie, ie_len);
910                 pos += ie_len;
911         }
912
913         return pos - buffer;
914 }
915
916 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
917                               const u8 *ssid, size_t ssid_len,
918                               const u8 *ie, size_t ie_len)
919 {
920         struct ieee80211_local *local = sdata->local;
921         struct sk_buff *skb;
922         struct ieee80211_mgmt *mgmt;
923         u8 *pos;
924
925         skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200 +
926                             ie_len);
927         if (!skb) {
928                 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
929                        "request\n", sdata->dev->name);
930                 return;
931         }
932         skb_reserve(skb, local->hw.extra_tx_headroom);
933
934         mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
935         memset(mgmt, 0, 24);
936         mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
937                                           IEEE80211_STYPE_PROBE_REQ);
938         memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
939         if (dst) {
940                 memcpy(mgmt->da, dst, ETH_ALEN);
941                 memcpy(mgmt->bssid, dst, ETH_ALEN);
942         } else {
943                 memset(mgmt->da, 0xff, ETH_ALEN);
944                 memset(mgmt->bssid, 0xff, ETH_ALEN);
945         }
946         pos = skb_put(skb, 2 + ssid_len);
947         *pos++ = WLAN_EID_SSID;
948         *pos++ = ssid_len;
949         memcpy(pos, ssid, ssid_len);
950         pos += ssid_len;
951
952         skb_put(skb, ieee80211_build_preq_ies(local, pos, ie, ie_len));
953
954         ieee80211_tx_skb(sdata, skb, 0);
955 }
956
957 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
958                             struct ieee802_11_elems *elems,
959                             enum ieee80211_band band)
960 {
961         struct ieee80211_supported_band *sband;
962         struct ieee80211_rate *bitrates;
963         size_t num_rates;
964         u32 supp_rates;
965         int i, j;
966         sband = local->hw.wiphy->bands[band];
967
968         if (!sband) {
969                 WARN_ON(1);
970                 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
971         }
972
973         bitrates = sband->bitrates;
974         num_rates = sband->n_bitrates;
975         supp_rates = 0;
976         for (i = 0; i < elems->supp_rates_len +
977                      elems->ext_supp_rates_len; i++) {
978                 u8 rate = 0;
979                 int own_rate;
980                 if (i < elems->supp_rates_len)
981                         rate = elems->supp_rates[i];
982                 else if (elems->ext_supp_rates)
983                         rate = elems->ext_supp_rates
984                                 [i - elems->supp_rates_len];
985                 own_rate = 5 * (rate & 0x7f);
986                 for (j = 0; j < num_rates; j++)
987                         if (bitrates[j].bitrate == own_rate)
988                                 supp_rates |= BIT(j);
989         }
990         return supp_rates;
991 }
992
993 int ieee80211_reconfig(struct ieee80211_local *local)
994 {
995         struct ieee80211_hw *hw = &local->hw;
996         struct ieee80211_sub_if_data *sdata;
997         struct ieee80211_if_init_conf conf;
998         struct sta_info *sta;
999         unsigned long flags;
1000         int res;
1001
1002         /* restart hardware */
1003         if (local->open_count) {
1004                 res = drv_start(local);
1005
1006                 ieee80211_led_radio(local, hw->conf.radio_enabled);
1007         }
1008
1009         /* add interfaces */
1010         list_for_each_entry(sdata, &local->interfaces, list) {
1011                 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1012                     sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1013                     netif_running(sdata->dev)) {
1014                         conf.vif = &sdata->vif;
1015                         conf.type = sdata->vif.type;
1016                         conf.mac_addr = sdata->dev->dev_addr;
1017                         res = drv_add_interface(local, &conf);
1018                 }
1019         }
1020
1021         /* add STAs back */
1022         if (local->ops->sta_notify) {
1023                 spin_lock_irqsave(&local->sta_lock, flags);
1024                 list_for_each_entry(sta, &local->sta_list, list) {
1025                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1026                                 sdata = container_of(sdata->bss,
1027                                              struct ieee80211_sub_if_data,
1028                                              u.ap);
1029
1030                         drv_sta_notify(local, &sdata->vif, STA_NOTIFY_ADD,
1031                                        &sta->sta);
1032                 }
1033                 spin_unlock_irqrestore(&local->sta_lock, flags);
1034         }
1035
1036         /* Clear Suspend state so that ADDBA requests can be processed */
1037
1038         rcu_read_lock();
1039
1040         if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1041                 list_for_each_entry_rcu(sta, &local->sta_list, list) {
1042                         clear_sta_flags(sta, WLAN_STA_SUSPEND);
1043                 }
1044         }
1045
1046         rcu_read_unlock();
1047
1048         /* setup RTS threshold */
1049         drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1050
1051         /* reconfigure hardware */
1052         ieee80211_hw_config(local, ~0);
1053
1054         netif_addr_lock_bh(local->mdev);
1055         ieee80211_configure_filter(local);
1056         netif_addr_unlock_bh(local->mdev);
1057
1058         /* Finally also reconfigure all the BSS information */
1059         list_for_each_entry(sdata, &local->interfaces, list) {
1060                 u32 changed = ~0;
1061                 if (!netif_running(sdata->dev))
1062                         continue;
1063                 switch (sdata->vif.type) {
1064                 case NL80211_IFTYPE_STATION:
1065                         /* disable beacon change bits */
1066                         changed &= ~(BSS_CHANGED_BEACON |
1067                                      BSS_CHANGED_BEACON_ENABLED);
1068                         /* fall through */
1069                 case NL80211_IFTYPE_ADHOC:
1070                 case NL80211_IFTYPE_AP:
1071                 case NL80211_IFTYPE_MESH_POINT:
1072                         ieee80211_bss_info_change_notify(sdata, changed);
1073                         break;
1074                 case NL80211_IFTYPE_WDS:
1075                         break;
1076                 case NL80211_IFTYPE_AP_VLAN:
1077                 case NL80211_IFTYPE_MONITOR:
1078                         /* ignore virtual */
1079                         break;
1080                 case NL80211_IFTYPE_UNSPECIFIED:
1081                 case __NL80211_IFTYPE_AFTER_LAST:
1082                         WARN_ON(1);
1083                         break;
1084                 }
1085         }
1086
1087         /* add back keys */
1088         list_for_each_entry(sdata, &local->interfaces, list)
1089                 if (netif_running(sdata->dev))
1090                         ieee80211_enable_keys(sdata);
1091
1092         ieee80211_wake_queues_by_reason(hw,
1093                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1094
1095         return 0;
1096 }