?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
airo: correct improper initialization of local variable
[firewire-audio.git] / net / mac80211 / util.c
blobe0431a1d218b1a299c092560c6d07b4f6c181780
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 <net/net_namespace.h>
24 #include <net/cfg80211.h>
25 #include <net/rtnetlink.h>
26
27 #include "ieee80211_i.h"
28 #include "rate.h"
29 #include "mesh.h"
30 #include "wme.h"
31
32 /* privid for wiphys to determine whether they belong to us or not */
33 void *mac80211_wiphy_privid = &mac80211_wiphy_privid;
34
35 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
36 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
37 const unsigned char rfc1042_header[] __aligned(2) =
38 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
39
40 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
41 const unsigned char bridge_tunnel_header[] __aligned(2) =
42 { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
43
44 struct ieee80211_hw *wiphy_to_ieee80211_hw(struct wiphy *wiphy)
45 {
46 struct ieee80211_local *local;
47 BUG_ON(!wiphy);
48
49 local = wiphy_priv(wiphy);
50 return &local->hw;
51 }
52 EXPORT_SYMBOL(wiphy_to_ieee80211_hw);
53
54 u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
55 enum nl80211_iftype type)
56 {
57 __le16 fc = hdr->frame_control;
58
59 /* drop ACK/CTS frames and incorrect hdr len (ctrl) */
60 if (len < 16)
61 return NULL;
62
63 if (ieee80211_is_data(fc)) {
64 if (len < 24) /* drop incorrect hdr len (data) */
65 return NULL;
66
67 if (ieee80211_has_a4(fc))
68 return NULL;
69 if (ieee80211_has_tods(fc))
70 return hdr->addr1;
71 if (ieee80211_has_fromds(fc))
72 return hdr->addr2;
73
74 return hdr->addr3;
75 }
76
77 if (ieee80211_is_mgmt(fc)) {
78 if (len < 24) /* drop incorrect hdr len (mgmt) */
79 return NULL;
80 return hdr->addr3;
81 }
82
83 if (ieee80211_is_ctl(fc)) {
84 if(ieee80211_is_pspoll(fc))
85 return hdr->addr1;
86
87 if (ieee80211_is_back_req(fc)) {
88 switch (type) {
89 case NL80211_IFTYPE_STATION:
90 return hdr->addr2;
91 case NL80211_IFTYPE_AP:
92 case NL80211_IFTYPE_AP_VLAN:
93 return hdr->addr1;
94 default:
95 break; /* fall through to the return */
96 }
97 }
98 }
99
100 return NULL;
101 }
102
103 unsigned int ieee80211_hdrlen(__le16 fc)
104 {
105 unsigned int hdrlen = 24;
106
107 if (ieee80211_is_data(fc)) {
108 if (ieee80211_has_a4(fc))
109 hdrlen = 30;
110 if (ieee80211_is_data_qos(fc))
111 hdrlen += IEEE80211_QOS_CTL_LEN;
112 goto out;
113 }
114
115 if (ieee80211_is_ctl(fc)) {
116 /*
117 * ACK and CTS are 10 bytes, all others 16. To see how
118 * to get this condition consider
119 * subtype mask: 0b0000000011110000 (0x00F0)
120 * ACK subtype: 0b0000000011010000 (0x00D0)
121 * CTS subtype: 0b0000000011000000 (0x00C0)
122 * bits that matter: ^^^ (0x00E0)
123 * value of those: 0b0000000011000000 (0x00C0)
124 */
125 if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
126 hdrlen = 10;
127 else
128 hdrlen = 16;
129 }
130 out:
131 return hdrlen;
132 }
133 EXPORT_SYMBOL(ieee80211_hdrlen);
134
135 unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
136 {
137 const struct ieee80211_hdr *hdr = (const struct ieee80211_hdr *)skb->data;
138 unsigned int hdrlen;
139
140 if (unlikely(skb->len < 10))
141 return 0;
142 hdrlen = ieee80211_hdrlen(hdr->frame_control);
143 if (unlikely(hdrlen > skb->len))
144 return 0;
145 return hdrlen;
146 }
147 EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
148
149 int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
150 {
151 int ae = meshhdr->flags & IEEE80211S_FLAGS_AE;
152 /* 7.1.3.5a.2 */
153 switch (ae) {
154 case 0:
155 return 6;
156 case 1:
157 return 12;
158 case 2:
159 return 18;
160 case 3:
161 return 24;
162 default:
163 return 6;
164 }
165 }
166
167 void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
168 {
169 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
170
171 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
172 if (tx->extra_frag) {
173 struct ieee80211_hdr *fhdr;
174 int i;
175 for (i = 0; i < tx->num_extra_frag; i++) {
176 fhdr = (struct ieee80211_hdr *)
177 tx->extra_frag[i]->data;
178 fhdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
179 }
180 }
181 }
182
183 int ieee80211_frame_duration(struct ieee80211_local *local, size_t len,
184 int rate, int erp, int short_preamble)
185 {
186 int dur;
187
188 /* calculate duration (in microseconds, rounded up to next higher
189 * integer if it includes a fractional microsecond) to send frame of
190 * len bytes (does not include FCS) at the given rate. Duration will
191 * also include SIFS.
192 *
193 * rate is in 100 kbps, so divident is multiplied by 10 in the
194 * DIV_ROUND_UP() operations.
195 */
196
197 if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ || erp) {
198 /*
199 * OFDM:
200 *
201 * N_DBPS = DATARATE x 4
202 * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
203 * (16 = SIGNAL time, 6 = tail bits)
204 * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
205 *
206 * T_SYM = 4 usec
207 * 802.11a - 17.5.2: aSIFSTime = 16 usec
208 * 802.11g - 19.8.4: aSIFSTime = 10 usec +
209 * signal ext = 6 usec
210 */
211 dur = 16; /* SIFS + signal ext */
212 dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */
213 dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */
214 dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
215 4 * rate); /* T_SYM x N_SYM */
216 } else {
217 /*
218 * 802.11b or 802.11g with 802.11b compatibility:
219 * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
220 * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
221 *
222 * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
223 * aSIFSTime = 10 usec
224 * aPreambleLength = 144 usec or 72 usec with short preamble
225 * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
226 */
227 dur = 10; /* aSIFSTime = 10 usec */
228 dur += short_preamble ? (72 + 24) : (144 + 48);
229
230 dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
231 }
232
233 return dur;
234 }
235
236 /* Exported duration function for driver use */
237 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
238 struct ieee80211_vif *vif,
239 size_t frame_len,
240 struct ieee80211_rate *rate)
241 {
242 struct ieee80211_local *local = hw_to_local(hw);
243 struct ieee80211_sub_if_data *sdata;
244 u16 dur;
245 int erp;
246 bool short_preamble = false;
247
248 erp = 0;
249 if (vif) {
250 sdata = vif_to_sdata(vif);
251 short_preamble = sdata->vif.bss_conf.use_short_preamble;
252 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
253 erp = rate->flags & IEEE80211_RATE_ERP_G;
254 }
255
256 dur = ieee80211_frame_duration(local, frame_len, rate->bitrate, erp,
257 short_preamble);
258
259 return cpu_to_le16(dur);
260 }
261 EXPORT_SYMBOL(ieee80211_generic_frame_duration);
262
263 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
264 struct ieee80211_vif *vif, size_t frame_len,
265 const struct ieee80211_tx_info *frame_txctl)
266 {
267 struct ieee80211_local *local = hw_to_local(hw);
268 struct ieee80211_rate *rate;
269 struct ieee80211_sub_if_data *sdata;
270 bool short_preamble;
271 int erp;
272 u16 dur;
273 struct ieee80211_supported_band *sband;
274
275 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
276
277 short_preamble = false;
278
279 rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
280
281 erp = 0;
282 if (vif) {
283 sdata = vif_to_sdata(vif);
284 short_preamble = sdata->vif.bss_conf.use_short_preamble;
285 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
286 erp = rate->flags & IEEE80211_RATE_ERP_G;
287 }
288
289 /* CTS duration */
290 dur = ieee80211_frame_duration(local, 10, rate->bitrate,
291 erp, short_preamble);
292 /* Data frame duration */
293 dur += ieee80211_frame_duration(local, frame_len, rate->bitrate,
294 erp, short_preamble);
295 /* ACK duration */
296 dur += ieee80211_frame_duration(local, 10, rate->bitrate,
297 erp, short_preamble);
298
299 return cpu_to_le16(dur);
300 }
301 EXPORT_SYMBOL(ieee80211_rts_duration);
302
303 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
304 struct ieee80211_vif *vif,
305 size_t frame_len,
306 const struct ieee80211_tx_info *frame_txctl)
307 {
308 struct ieee80211_local *local = hw_to_local(hw);
309 struct ieee80211_rate *rate;
310 struct ieee80211_sub_if_data *sdata;
311 bool short_preamble;
312 int erp;
313 u16 dur;
314 struct ieee80211_supported_band *sband;
315
316 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
317
318 short_preamble = false;
319
320 rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
321 erp = 0;
322 if (vif) {
323 sdata = vif_to_sdata(vif);
324 short_preamble = sdata->vif.bss_conf.use_short_preamble;
325 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
326 erp = rate->flags & IEEE80211_RATE_ERP_G;
327 }
328
329 /* Data frame duration */
330 dur = ieee80211_frame_duration(local, frame_len, rate->bitrate,
331 erp, short_preamble);
332 if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
333 /* ACK duration */
334 dur += ieee80211_frame_duration(local, 10, rate->bitrate,
335 erp, short_preamble);
336 }
337
338 return cpu_to_le16(dur);
339 }
340 EXPORT_SYMBOL(ieee80211_ctstoself_duration);
341
342 static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
343 enum queue_stop_reason reason)
344 {
345 struct ieee80211_local *local = hw_to_local(hw);
346
347 if (queue >= hw->queues) {
348 if (local->ampdu_ac_queue[queue - hw->queues] < 0)
349 return;
350
351 /*
352 * for virtual aggregation queues, we need to refcount the
353 * internal mac80211 disable (multiple times!), keep track of
354 * driver disable _and_ make sure the regular queue is
355 * actually enabled.
356 */
357 if (reason == IEEE80211_QUEUE_STOP_REASON_AGGREGATION)
358 local->amdpu_ac_stop_refcnt[queue - hw->queues]--;
359 else
360 __clear_bit(reason, &local->queue_stop_reasons[queue]);
361
362 if (local->queue_stop_reasons[queue] ||
363 local->amdpu_ac_stop_refcnt[queue - hw->queues])
364 return;
365
366 /* now go on to treat the corresponding regular queue */
367 queue = local->ampdu_ac_queue[queue - hw->queues];
368 reason = IEEE80211_QUEUE_STOP_REASON_AGGREGATION;
369 }
370
371 __clear_bit(reason, &local->queue_stop_reasons[queue]);
372
373 if (local->queue_stop_reasons[queue] != 0)
374 /* someone still has this queue stopped */
375 return;
376
377 if (test_bit(queue, local->queues_pending)) {
378 set_bit(queue, local->queues_pending_run);
379 tasklet_schedule(&local->tx_pending_tasklet);
380 } else {
381 netif_wake_subqueue(local->mdev, queue);
382 }
383 }
384
385 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
386 enum queue_stop_reason reason)
387 {
388 struct ieee80211_local *local = hw_to_local(hw);
389 unsigned long flags;
390
391 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
392 __ieee80211_wake_queue(hw, queue, reason);
393 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
394 }
395
396 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
397 {
398 ieee80211_wake_queue_by_reason(hw, queue,
399 IEEE80211_QUEUE_STOP_REASON_DRIVER);
400 }
401 EXPORT_SYMBOL(ieee80211_wake_queue);
402
403 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
404 enum queue_stop_reason reason)
405 {
406 struct ieee80211_local *local = hw_to_local(hw);
407
408 if (queue >= hw->queues) {
409 if (local->ampdu_ac_queue[queue - hw->queues] < 0)
410 return;
411
412 /*
413 * for virtual aggregation queues, we need to refcount the
414 * internal mac80211 disable (multiple times!), keep track of
415 * driver disable _and_ make sure the regular queue is
416 * actually enabled.
417 */
418 if (reason == IEEE80211_QUEUE_STOP_REASON_AGGREGATION)
419 local->amdpu_ac_stop_refcnt[queue - hw->queues]++;
420 else
421 __set_bit(reason, &local->queue_stop_reasons[queue]);
422
423 /* now go on to treat the corresponding regular queue */
424 queue = local->ampdu_ac_queue[queue - hw->queues];
425 reason = IEEE80211_QUEUE_STOP_REASON_AGGREGATION;
426 }
427
428 __set_bit(reason, &local->queue_stop_reasons[queue]);
429
430 netif_stop_subqueue(local->mdev, queue);
431 }
432
433 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
434 enum queue_stop_reason reason)
435 {
436 struct ieee80211_local *local = hw_to_local(hw);
437 unsigned long flags;
438
439 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
440 __ieee80211_stop_queue(hw, queue, reason);
441 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
442 }
443
444 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
445 {
446 ieee80211_stop_queue_by_reason(hw, queue,
447 IEEE80211_QUEUE_STOP_REASON_DRIVER);
448 }
449 EXPORT_SYMBOL(ieee80211_stop_queue);
450
451 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
452 enum queue_stop_reason reason)
453 {
454 struct ieee80211_local *local = hw_to_local(hw);
455 unsigned long flags;
456 int i;
457
458 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
459
460 for (i = 0; i < hw->queues; i++)
461 __ieee80211_stop_queue(hw, i, reason);
462
463 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
464 }
465
466 void ieee80211_stop_queues(struct ieee80211_hw *hw)
467 {
468 ieee80211_stop_queues_by_reason(hw,
469 IEEE80211_QUEUE_STOP_REASON_DRIVER);
470 }
471 EXPORT_SYMBOL(ieee80211_stop_queues);
472
473 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
474 {
475 struct ieee80211_local *local = hw_to_local(hw);
476 unsigned long flags;
477
478 if (queue >= hw->queues) {
479 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
480 queue = local->ampdu_ac_queue[queue - hw->queues];
481 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
482 if (queue < 0)
483 return true;
484 }
485
486 return __netif_subqueue_stopped(local->mdev, queue);
487 }
488 EXPORT_SYMBOL(ieee80211_queue_stopped);
489
490 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
491 enum queue_stop_reason reason)
492 {
493 struct ieee80211_local *local = hw_to_local(hw);
494 unsigned long flags;
495 int i;
496
497 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
498
499 for (i = 0; i < hw->queues + hw->ampdu_queues; i++)
500 __ieee80211_wake_queue(hw, i, reason);
501
502 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
503 }
504
505 void ieee80211_wake_queues(struct ieee80211_hw *hw)
506 {
507 ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
508 }
509 EXPORT_SYMBOL(ieee80211_wake_queues);
510
511 void ieee80211_iterate_active_interfaces(
512 struct ieee80211_hw *hw,
513 void (*iterator)(void *data, u8 *mac,
514 struct ieee80211_vif *vif),
515 void *data)
516 {
517 struct ieee80211_local *local = hw_to_local(hw);
518 struct ieee80211_sub_if_data *sdata;
519
520 mutex_lock(&local->iflist_mtx);
521
522 list_for_each_entry(sdata, &local->interfaces, list) {
523 switch (sdata->vif.type) {
524 case __NL80211_IFTYPE_AFTER_LAST:
525 case NL80211_IFTYPE_UNSPECIFIED:
526 case NL80211_IFTYPE_MONITOR:
527 case NL80211_IFTYPE_AP_VLAN:
528 continue;
529 case NL80211_IFTYPE_AP:
530 case NL80211_IFTYPE_STATION:
531 case NL80211_IFTYPE_ADHOC:
532 case NL80211_IFTYPE_WDS:
533 case NL80211_IFTYPE_MESH_POINT:
534 break;
535 }
536 if (netif_running(sdata->dev))
537 iterator(data, sdata->dev->dev_addr,
538 &sdata->vif);
539 }
540
541 mutex_unlock(&local->iflist_mtx);
542 }
543 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
544
545 void ieee80211_iterate_active_interfaces_atomic(
546 struct ieee80211_hw *hw,
547 void (*iterator)(void *data, u8 *mac,
548 struct ieee80211_vif *vif),
549 void *data)
550 {
551 struct ieee80211_local *local = hw_to_local(hw);
552 struct ieee80211_sub_if_data *sdata;
553
554 rcu_read_lock();
555
556 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
557 switch (sdata->vif.type) {
558 case __NL80211_IFTYPE_AFTER_LAST:
559 case NL80211_IFTYPE_UNSPECIFIED:
560 case NL80211_IFTYPE_MONITOR:
561 case NL80211_IFTYPE_AP_VLAN:
562 continue;
563 case NL80211_IFTYPE_AP:
564 case NL80211_IFTYPE_STATION:
565 case NL80211_IFTYPE_ADHOC:
566 case NL80211_IFTYPE_WDS:
567 case NL80211_IFTYPE_MESH_POINT:
568 break;
569 }
570 if (netif_running(sdata->dev))
571 iterator(data, sdata->dev->dev_addr,
572 &sdata->vif);
573 }
574
575 rcu_read_unlock();
576 }
577 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
578
579 void ieee802_11_parse_elems(u8 *start, size_t len,
580 struct ieee802_11_elems *elems)
581 {
582 size_t left = len;
583 u8 *pos = start;
584
585 memset(elems, 0, sizeof(*elems));
586 elems->ie_start = start;
587 elems->total_len = len;
588
589 while (left >= 2) {
590 u8 id, elen;
591
592 id = *pos++;
593 elen = *pos++;
594 left -= 2;
595
596 if (elen > left)
597 return;
598
599 switch (id) {
600 case WLAN_EID_SSID:
601 elems->ssid = pos;
602 elems->ssid_len = elen;
603 break;
604 case WLAN_EID_SUPP_RATES:
605 elems->supp_rates = pos;
606 elems->supp_rates_len = elen;
607 break;
608 case WLAN_EID_FH_PARAMS:
609 elems->fh_params = pos;
610 elems->fh_params_len = elen;
611 break;
612 case WLAN_EID_DS_PARAMS:
613 elems->ds_params = pos;
614 elems->ds_params_len = elen;
615 break;
616 case WLAN_EID_CF_PARAMS:
617 elems->cf_params = pos;
618 elems->cf_params_len = elen;
619 break;
620 case WLAN_EID_TIM:
621 elems->tim = pos;
622 elems->tim_len = elen;
623 break;
624 case WLAN_EID_IBSS_PARAMS:
625 elems->ibss_params = pos;
626 elems->ibss_params_len = elen;
627 break;
628 case WLAN_EID_CHALLENGE:
629 elems->challenge = pos;
630 elems->challenge_len = elen;
631 break;
632 case WLAN_EID_WPA:
633 if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
634 pos[2] == 0xf2) {
635 /* Microsoft OUI (00:50:F2) */
636 if (pos[3] == 1) {
637 /* OUI Type 1 - WPA IE */
638 elems->wpa = pos;
639 elems->wpa_len = elen;
640 } else if (elen >= 5 && pos[3] == 2) {
641 if (pos[4] == 0) {
642 elems->wmm_info = pos;
643 elems->wmm_info_len = elen;
644 } else if (pos[4] == 1) {
645 elems->wmm_param = pos;
646 elems->wmm_param_len = elen;
647 }
648 }
649 }
650 break;
651 case WLAN_EID_RSN:
652 elems->rsn = pos;
653 elems->rsn_len = elen;
654 break;
655 case WLAN_EID_ERP_INFO:
656 elems->erp_info = pos;
657 elems->erp_info_len = elen;
658 break;
659 case WLAN_EID_EXT_SUPP_RATES:
660 elems->ext_supp_rates = pos;
661 elems->ext_supp_rates_len = elen;
662 break;
663 case WLAN_EID_HT_CAPABILITY:
664 if (elen >= sizeof(struct ieee80211_ht_cap))
665 elems->ht_cap_elem = (void *)pos;
666 break;
667 case WLAN_EID_HT_INFORMATION:
668 if (elen >= sizeof(struct ieee80211_ht_info))
669 elems->ht_info_elem = (void *)pos;
670 break;
671 case WLAN_EID_MESH_ID:
672 elems->mesh_id = pos;
673 elems->mesh_id_len = elen;
674 break;
675 case WLAN_EID_MESH_CONFIG:
676 elems->mesh_config = pos;
677 elems->mesh_config_len = elen;
678 break;
679 case WLAN_EID_PEER_LINK:
680 elems->peer_link = pos;
681 elems->peer_link_len = elen;
682 break;
683 case WLAN_EID_PREQ:
684 elems->preq = pos;
685 elems->preq_len = elen;
686 break;
687 case WLAN_EID_PREP:
688 elems->prep = pos;
689 elems->prep_len = elen;
690 break;
691 case WLAN_EID_PERR:
692 elems->perr = pos;
693 elems->perr_len = elen;
694 break;
695 case WLAN_EID_CHANNEL_SWITCH:
696 elems->ch_switch_elem = pos;
697 elems->ch_switch_elem_len = elen;
698 break;
699 case WLAN_EID_QUIET:
700 if (!elems->quiet_elem) {
701 elems->quiet_elem = pos;
702 elems->quiet_elem_len = elen;
703 }
704 elems->num_of_quiet_elem++;
705 break;
706 case WLAN_EID_COUNTRY:
707 elems->country_elem = pos;
708 elems->country_elem_len = elen;
709 break;
710 case WLAN_EID_PWR_CONSTRAINT:
711 elems->pwr_constr_elem = pos;
712 elems->pwr_constr_elem_len = elen;
713 break;
714 case WLAN_EID_TIMEOUT_INTERVAL:
715 elems->timeout_int = pos;
716 elems->timeout_int_len = elen;
717 break;
718 default:
719 break;
720 }
721
722 left -= elen;
723 pos += elen;
724 }
725 }
726
727 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata)
728 {
729 struct ieee80211_local *local = sdata->local;
730 struct ieee80211_tx_queue_params qparam;
731 int i;
732
733 if (!local->ops->conf_tx)
734 return;
735
736 memset(&qparam, 0, sizeof(qparam));
737
738 qparam.aifs = 2;
739
740 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
741 !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE))
742 qparam.cw_min = 31;
743 else
744 qparam.cw_min = 15;
745
746 qparam.cw_max = 1023;
747 qparam.txop = 0;
748
749 for (i = 0; i < local_to_hw(local)->queues; i++)
750 local->ops->conf_tx(local_to_hw(local), i, &qparam);
751 }
752
753 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
754 const size_t supp_rates_len,
755 const u8 *supp_rates)
756 {
757 struct ieee80211_local *local = sdata->local;
758 int i, have_higher_than_11mbit = 0;
759
760 /* cf. IEEE 802.11 9.2.12 */
761 for (i = 0; i < supp_rates_len; i++)
762 if ((supp_rates[i] & 0x7f) * 5 > 110)
763 have_higher_than_11mbit = 1;
764
765 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
766 have_higher_than_11mbit)
767 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
768 else
769 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
770
771 ieee80211_set_wmm_default(sdata);
772 }
773
774 void ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
775 int encrypt)
776 {
777 skb->dev = sdata->local->mdev;
778 skb_set_mac_header(skb, 0);
779 skb_set_network_header(skb, 0);
780 skb_set_transport_header(skb, 0);
781
782 skb->iif = sdata->dev->ifindex;
783 skb->do_not_encrypt = !encrypt;
784
785 dev_queue_xmit(skb);
786 }
787
788 int ieee80211_set_freq(struct ieee80211_sub_if_data *sdata, int freqMHz)
789 {
790 int ret = -EINVAL;
791 struct ieee80211_channel *chan;
792 struct ieee80211_local *local = sdata->local;
793
794 chan = ieee80211_get_channel(local->hw.wiphy, freqMHz);
795
796 if (chan && !(chan->flags & IEEE80211_CHAN_DISABLED)) {
797 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
798 chan->flags & IEEE80211_CHAN_NO_IBSS)
799 return ret;
800 local->oper_channel = chan;
801 local->oper_channel_type = NL80211_CHAN_NO_HT;
802
803 if (local->sw_scanning || local->hw_scanning)
804 ret = 0;
805 else
806 ret = ieee80211_hw_config(
807 local, IEEE80211_CONF_CHANGE_CHANNEL);
808 }
809
810 return ret;
811 }
812
813 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
814 enum ieee80211_band band)
815 {
816 struct ieee80211_supported_band *sband;
817 struct ieee80211_rate *bitrates;
818 u32 mandatory_rates;
819 enum ieee80211_rate_flags mandatory_flag;
820 int i;
821
822 sband = local->hw.wiphy->bands[band];
823 if (!sband) {
824 WARN_ON(1);
825 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
826 }
827
828 if (band == IEEE80211_BAND_2GHZ)
829 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
830 else
831 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
832
833 bitrates = sband->bitrates;
834 mandatory_rates = 0;
835 for (i = 0; i < sband->n_bitrates; i++)
836 if (bitrates[i].flags & mandatory_flag)
837 mandatory_rates |= BIT(i);
838 return mandatory_rates;
839 }
840
841 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
842 u16 transaction, u16 auth_alg,
843 u8 *extra, size_t extra_len,
844 const u8 *bssid, int encrypt)
845 {
846 struct ieee80211_local *local = sdata->local;
847 struct sk_buff *skb;
848 struct ieee80211_mgmt *mgmt;
849 const u8 *ie_auth = NULL;
850 int ie_auth_len = 0;
851
852 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
853 ie_auth_len = sdata->u.mgd.ie_auth_len;
854 ie_auth = sdata->u.mgd.ie_auth;
855 }
856
857 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
858 sizeof(*mgmt) + 6 + extra_len + ie_auth_len);
859 if (!skb) {
860 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
861 "frame\n", sdata->dev->name);
862 return;
863 }
864 skb_reserve(skb, local->hw.extra_tx_headroom);
865
866 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
867 memset(mgmt, 0, 24 + 6);
868 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
869 IEEE80211_STYPE_AUTH);
870 if (encrypt)
871 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
872 memcpy(mgmt->da, bssid, ETH_ALEN);
873 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
874 memcpy(mgmt->bssid, bssid, ETH_ALEN);
875 mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
876 mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
877 mgmt->u.auth.status_code = cpu_to_le16(0);
878 if (extra)
879 memcpy(skb_put(skb, extra_len), extra, extra_len);
880 if (ie_auth)
881 memcpy(skb_put(skb, ie_auth_len), ie_auth, ie_auth_len);
882
883 ieee80211_tx_skb(sdata, skb, encrypt);
884 }
885
886 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
887 u8 *ssid, size_t ssid_len,
888 u8 *ie, size_t ie_len)
889 {
890 struct ieee80211_local *local = sdata->local;
891 struct ieee80211_supported_band *sband;
892 struct sk_buff *skb;
893 struct ieee80211_mgmt *mgmt;
894 u8 *pos, *supp_rates, *esupp_rates = NULL, *extra_preq_ie = NULL;
895 int i, extra_preq_ie_len = 0;
896
897 switch (sdata->vif.type) {
898 case NL80211_IFTYPE_STATION:
899 extra_preq_ie_len = sdata->u.mgd.ie_probereq_len;
900 extra_preq_ie = sdata->u.mgd.ie_probereq;
901 break;
902 default:
903 break;
904 }
905
906 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200 +
907 ie_len + extra_preq_ie_len);
908 if (!skb) {
909 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
910 "request\n", sdata->dev->name);
911 return;
912 }
913 skb_reserve(skb, local->hw.extra_tx_headroom);
914
915 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
916 memset(mgmt, 0, 24);
917 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
918 IEEE80211_STYPE_PROBE_REQ);
919 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
920 if (dst) {
921 memcpy(mgmt->da, dst, ETH_ALEN);
922 memcpy(mgmt->bssid, dst, ETH_ALEN);
923 } else {
924 memset(mgmt->da, 0xff, ETH_ALEN);
925 memset(mgmt->bssid, 0xff, ETH_ALEN);
926 }
927 pos = skb_put(skb, 2 + ssid_len);
928 *pos++ = WLAN_EID_SSID;
929 *pos++ = ssid_len;
930 memcpy(pos, ssid, ssid_len);
931
932 supp_rates = skb_put(skb, 2);
933 supp_rates[0] = WLAN_EID_SUPP_RATES;
934 supp_rates[1] = 0;
935 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
936
937 for (i = 0; i < sband->n_bitrates; i++) {
938 struct ieee80211_rate *rate = &sband->bitrates[i];
939 if (esupp_rates) {
940 pos = skb_put(skb, 1);
941 esupp_rates[1]++;
942 } else if (supp_rates[1] == 8) {
943 esupp_rates = skb_put(skb, 3);
944 esupp_rates[0] = WLAN_EID_EXT_SUPP_RATES;
945 esupp_rates[1] = 1;
946 pos = &esupp_rates[2];
947 } else {
948 pos = skb_put(skb, 1);
949 supp_rates[1]++;
950 }
951 *pos = rate->bitrate / 5;
952 }
953
954 if (ie)
955 memcpy(skb_put(skb, ie_len), ie, ie_len);
956 if (extra_preq_ie)
957 memcpy(skb_put(skb, extra_preq_ie_len), extra_preq_ie,
958 extra_preq_ie_len);
959
960 ieee80211_tx_skb(sdata, skb, 0);
961 }
962
963 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
964 struct ieee802_11_elems *elems,
965 enum ieee80211_band band)
966 {
967 struct ieee80211_supported_band *sband;
968 struct ieee80211_rate *bitrates;
969 size_t num_rates;
970 u32 supp_rates;
971 int i, j;
972 sband = local->hw.wiphy->bands[band];
973
974 if (!sband) {
975 WARN_ON(1);
976 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
977 }
978
979 bitrates = sband->bitrates;
980 num_rates = sband->n_bitrates;
981 supp_rates = 0;
982 for (i = 0; i < elems->supp_rates_len +
983 elems->ext_supp_rates_len; i++) {
984 u8 rate = 0;
985 int own_rate;
986 if (i < elems->supp_rates_len)
987 rate = elems->supp_rates[i];
988 else if (elems->ext_supp_rates)
989 rate = elems->ext_supp_rates
990 [i - elems->supp_rates_len];
991 own_rate = 5 * (rate & 0x7f);
992 for (j = 0; j < num_rates; j++)
993 if (bitrates[j].bitrate == own_rate)
994 supp_rates |= BIT(j);
995 }
996 return supp_rates;
997 }
AMDTP streaming driver for the Linux FireWire stack (Juju)