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ksm: clean up obsolete references
[linux-2.6/next.git] / net / mac80211 / util.c
blobdd6564321369cf519f2310bc0fdea26c95a89fbc
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 #include "wep.h"
35
36 /* privid for wiphys to determine whether they belong to us or not */
37 void *mac80211_wiphy_privid = &mac80211_wiphy_privid;
38
39 struct ieee80211_hw *wiphy_to_ieee80211_hw(struct wiphy *wiphy)
40 {
41 struct ieee80211_local *local;
42 BUG_ON(!wiphy);
43
44 local = wiphy_priv(wiphy);
45 return &local->hw;
46 }
47 EXPORT_SYMBOL(wiphy_to_ieee80211_hw);
48
49 u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
50 enum nl80211_iftype type)
51 {
52 __le16 fc = hdr->frame_control;
53
54 /* drop ACK/CTS frames and incorrect hdr len (ctrl) */
55 if (len < 16)
56 return NULL;
57
58 if (ieee80211_is_data(fc)) {
59 if (len < 24) /* drop incorrect hdr len (data) */
60 return NULL;
61
62 if (ieee80211_has_a4(fc))
63 return NULL;
64 if (ieee80211_has_tods(fc))
65 return hdr->addr1;
66 if (ieee80211_has_fromds(fc))
67 return hdr->addr2;
68
69 return hdr->addr3;
70 }
71
72 if (ieee80211_is_mgmt(fc)) {
73 if (len < 24) /* drop incorrect hdr len (mgmt) */
74 return NULL;
75 return hdr->addr3;
76 }
77
78 if (ieee80211_is_ctl(fc)) {
79 if(ieee80211_is_pspoll(fc))
80 return hdr->addr1;
81
82 if (ieee80211_is_back_req(fc)) {
83 switch (type) {
84 case NL80211_IFTYPE_STATION:
85 return hdr->addr2;
86 case NL80211_IFTYPE_AP:
87 case NL80211_IFTYPE_AP_VLAN:
88 return hdr->addr1;
89 default:
90 break; /* fall through to the return */
91 }
92 }
93 }
94
95 return NULL;
96 }
97
98 void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
99 {
100 struct sk_buff *skb = tx->skb;
101 struct ieee80211_hdr *hdr;
102
103 do {
104 hdr = (struct ieee80211_hdr *) skb->data;
105 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
106 } while ((skb = skb->next));
107 }
108
109 int ieee80211_frame_duration(struct ieee80211_local *local, size_t len,
110 int rate, int erp, int short_preamble)
111 {
112 int dur;
113
114 /* calculate duration (in microseconds, rounded up to next higher
115 * integer if it includes a fractional microsecond) to send frame of
116 * len bytes (does not include FCS) at the given rate. Duration will
117 * also include SIFS.
118 *
119 * rate is in 100 kbps, so divident is multiplied by 10 in the
120 * DIV_ROUND_UP() operations.
121 */
122
123 if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ || erp) {
124 /*
125 * OFDM:
126 *
127 * N_DBPS = DATARATE x 4
128 * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
129 * (16 = SIGNAL time, 6 = tail bits)
130 * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
131 *
132 * T_SYM = 4 usec
133 * 802.11a - 17.5.2: aSIFSTime = 16 usec
134 * 802.11g - 19.8.4: aSIFSTime = 10 usec +
135 * signal ext = 6 usec
136 */
137 dur = 16; /* SIFS + signal ext */
138 dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */
139 dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */
140 dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
141 4 * rate); /* T_SYM x N_SYM */
142 } else {
143 /*
144 * 802.11b or 802.11g with 802.11b compatibility:
145 * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
146 * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
147 *
148 * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
149 * aSIFSTime = 10 usec
150 * aPreambleLength = 144 usec or 72 usec with short preamble
151 * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
152 */
153 dur = 10; /* aSIFSTime = 10 usec */
154 dur += short_preamble ? (72 + 24) : (144 + 48);
155
156 dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
157 }
158
159 return dur;
160 }
161
162 /* Exported duration function for driver use */
163 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
164 struct ieee80211_vif *vif,
165 size_t frame_len,
166 struct ieee80211_rate *rate)
167 {
168 struct ieee80211_local *local = hw_to_local(hw);
169 struct ieee80211_sub_if_data *sdata;
170 u16 dur;
171 int erp;
172 bool short_preamble = false;
173
174 erp = 0;
175 if (vif) {
176 sdata = vif_to_sdata(vif);
177 short_preamble = sdata->vif.bss_conf.use_short_preamble;
178 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
179 erp = rate->flags & IEEE80211_RATE_ERP_G;
180 }
181
182 dur = ieee80211_frame_duration(local, frame_len, rate->bitrate, erp,
183 short_preamble);
184
185 return cpu_to_le16(dur);
186 }
187 EXPORT_SYMBOL(ieee80211_generic_frame_duration);
188
189 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
190 struct ieee80211_vif *vif, size_t frame_len,
191 const struct ieee80211_tx_info *frame_txctl)
192 {
193 struct ieee80211_local *local = hw_to_local(hw);
194 struct ieee80211_rate *rate;
195 struct ieee80211_sub_if_data *sdata;
196 bool short_preamble;
197 int erp;
198 u16 dur;
199 struct ieee80211_supported_band *sband;
200
201 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
202
203 short_preamble = false;
204
205 rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
206
207 erp = 0;
208 if (vif) {
209 sdata = vif_to_sdata(vif);
210 short_preamble = sdata->vif.bss_conf.use_short_preamble;
211 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
212 erp = rate->flags & IEEE80211_RATE_ERP_G;
213 }
214
215 /* CTS duration */
216 dur = ieee80211_frame_duration(local, 10, rate->bitrate,
217 erp, short_preamble);
218 /* Data frame duration */
219 dur += ieee80211_frame_duration(local, frame_len, rate->bitrate,
220 erp, short_preamble);
221 /* ACK duration */
222 dur += ieee80211_frame_duration(local, 10, rate->bitrate,
223 erp, short_preamble);
224
225 return cpu_to_le16(dur);
226 }
227 EXPORT_SYMBOL(ieee80211_rts_duration);
228
229 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
230 struct ieee80211_vif *vif,
231 size_t frame_len,
232 const struct ieee80211_tx_info *frame_txctl)
233 {
234 struct ieee80211_local *local = hw_to_local(hw);
235 struct ieee80211_rate *rate;
236 struct ieee80211_sub_if_data *sdata;
237 bool short_preamble;
238 int erp;
239 u16 dur;
240 struct ieee80211_supported_band *sband;
241
242 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
243
244 short_preamble = false;
245
246 rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
247 erp = 0;
248 if (vif) {
249 sdata = vif_to_sdata(vif);
250 short_preamble = sdata->vif.bss_conf.use_short_preamble;
251 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
252 erp = rate->flags & IEEE80211_RATE_ERP_G;
253 }
254
255 /* Data frame duration */
256 dur = ieee80211_frame_duration(local, frame_len, rate->bitrate,
257 erp, short_preamble);
258 if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
259 /* ACK duration */
260 dur += ieee80211_frame_duration(local, 10, rate->bitrate,
261 erp, short_preamble);
262 }
263
264 return cpu_to_le16(dur);
265 }
266 EXPORT_SYMBOL(ieee80211_ctstoself_duration);
267
268 static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
269 enum queue_stop_reason reason)
270 {
271 struct ieee80211_local *local = hw_to_local(hw);
272
273 if (WARN_ON(queue >= hw->queues))
274 return;
275
276 __clear_bit(reason, &local->queue_stop_reasons[queue]);
277
278 if (local->queue_stop_reasons[queue] != 0)
279 /* someone still has this queue stopped */
280 return;
281
282 if (!skb_queue_empty(&local->pending[queue]))
283 tasklet_schedule(&local->tx_pending_tasklet);
284 }
285
286 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
287 enum queue_stop_reason reason)
288 {
289 struct ieee80211_local *local = hw_to_local(hw);
290 unsigned long flags;
291
292 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
293 __ieee80211_wake_queue(hw, queue, reason);
294 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
295 }
296
297 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
298 {
299 ieee80211_wake_queue_by_reason(hw, queue,
300 IEEE80211_QUEUE_STOP_REASON_DRIVER);
301 }
302 EXPORT_SYMBOL(ieee80211_wake_queue);
303
304 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
305 enum queue_stop_reason reason)
306 {
307 struct ieee80211_local *local = hw_to_local(hw);
308
309 if (WARN_ON(queue >= hw->queues))
310 return;
311
312 __set_bit(reason, &local->queue_stop_reasons[queue]);
313 }
314
315 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
316 enum queue_stop_reason reason)
317 {
318 struct ieee80211_local *local = hw_to_local(hw);
319 unsigned long flags;
320
321 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
322 __ieee80211_stop_queue(hw, queue, reason);
323 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
324 }
325
326 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
327 {
328 ieee80211_stop_queue_by_reason(hw, queue,
329 IEEE80211_QUEUE_STOP_REASON_DRIVER);
330 }
331 EXPORT_SYMBOL(ieee80211_stop_queue);
332
333 void ieee80211_add_pending_skb(struct ieee80211_local *local,
334 struct sk_buff *skb)
335 {
336 struct ieee80211_hw *hw = &local->hw;
337 unsigned long flags;
338 int queue = skb_get_queue_mapping(skb);
339 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
340
341 if (WARN_ON(!info->control.vif)) {
342 kfree(skb);
343 return;
344 }
345
346 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
347 __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
348 __skb_queue_tail(&local->pending[queue], skb);
349 __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
350 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
351 }
352
353 int ieee80211_add_pending_skbs(struct ieee80211_local *local,
354 struct sk_buff_head *skbs)
355 {
356 struct ieee80211_hw *hw = &local->hw;
357 struct sk_buff *skb;
358 unsigned long flags;
359 int queue, ret = 0, i;
360
361 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
362 for (i = 0; i < hw->queues; i++)
363 __ieee80211_stop_queue(hw, i,
364 IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
365
366 while ((skb = skb_dequeue(skbs))) {
367 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
368
369 if (WARN_ON(!info->control.vif)) {
370 kfree(skb);
371 continue;
372 }
373
374 ret++;
375 queue = skb_get_queue_mapping(skb);
376 __skb_queue_tail(&local->pending[queue], skb);
377 }
378
379 for (i = 0; i < hw->queues; i++)
380 __ieee80211_wake_queue(hw, i,
381 IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
382 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
383
384 return ret;
385 }
386
387 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
388 enum queue_stop_reason reason)
389 {
390 struct ieee80211_local *local = hw_to_local(hw);
391 unsigned long flags;
392 int i;
393
394 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
395
396 for (i = 0; i < hw->queues; i++)
397 __ieee80211_stop_queue(hw, i, reason);
398
399 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
400 }
401
402 void ieee80211_stop_queues(struct ieee80211_hw *hw)
403 {
404 ieee80211_stop_queues_by_reason(hw,
405 IEEE80211_QUEUE_STOP_REASON_DRIVER);
406 }
407 EXPORT_SYMBOL(ieee80211_stop_queues);
408
409 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
410 {
411 struct ieee80211_local *local = hw_to_local(hw);
412 unsigned long flags;
413 int ret;
414
415 if (WARN_ON(queue >= hw->queues))
416 return true;
417
418 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
419 ret = !!local->queue_stop_reasons[queue];
420 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
421 return ret;
422 }
423 EXPORT_SYMBOL(ieee80211_queue_stopped);
424
425 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
426 enum queue_stop_reason reason)
427 {
428 struct ieee80211_local *local = hw_to_local(hw);
429 unsigned long flags;
430 int i;
431
432 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
433
434 for (i = 0; i < hw->queues; i++)
435 __ieee80211_wake_queue(hw, i, reason);
436
437 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
438 }
439
440 void ieee80211_wake_queues(struct ieee80211_hw *hw)
441 {
442 ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
443 }
444 EXPORT_SYMBOL(ieee80211_wake_queues);
445
446 void ieee80211_iterate_active_interfaces(
447 struct ieee80211_hw *hw,
448 void (*iterator)(void *data, u8 *mac,
449 struct ieee80211_vif *vif),
450 void *data)
451 {
452 struct ieee80211_local *local = hw_to_local(hw);
453 struct ieee80211_sub_if_data *sdata;
454
455 mutex_lock(&local->iflist_mtx);
456
457 list_for_each_entry(sdata, &local->interfaces, list) {
458 switch (sdata->vif.type) {
459 case __NL80211_IFTYPE_AFTER_LAST:
460 case NL80211_IFTYPE_UNSPECIFIED:
461 case NL80211_IFTYPE_MONITOR:
462 case NL80211_IFTYPE_AP_VLAN:
463 continue;
464 case NL80211_IFTYPE_AP:
465 case NL80211_IFTYPE_STATION:
466 case NL80211_IFTYPE_ADHOC:
467 case NL80211_IFTYPE_WDS:
468 case NL80211_IFTYPE_MESH_POINT:
469 break;
470 }
471 if (netif_running(sdata->dev))
472 iterator(data, sdata->dev->dev_addr,
473 &sdata->vif);
474 }
475
476 mutex_unlock(&local->iflist_mtx);
477 }
478 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
479
480 void ieee80211_iterate_active_interfaces_atomic(
481 struct ieee80211_hw *hw,
482 void (*iterator)(void *data, u8 *mac,
483 struct ieee80211_vif *vif),
484 void *data)
485 {
486 struct ieee80211_local *local = hw_to_local(hw);
487 struct ieee80211_sub_if_data *sdata;
488
489 rcu_read_lock();
490
491 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
492 switch (sdata->vif.type) {
493 case __NL80211_IFTYPE_AFTER_LAST:
494 case NL80211_IFTYPE_UNSPECIFIED:
495 case NL80211_IFTYPE_MONITOR:
496 case NL80211_IFTYPE_AP_VLAN:
497 continue;
498 case NL80211_IFTYPE_AP:
499 case NL80211_IFTYPE_STATION:
500 case NL80211_IFTYPE_ADHOC:
501 case NL80211_IFTYPE_WDS:
502 case NL80211_IFTYPE_MESH_POINT:
503 break;
504 }
505 if (netif_running(sdata->dev))
506 iterator(data, sdata->dev->dev_addr,
507 &sdata->vif);
508 }
509
510 rcu_read_unlock();
511 }
512 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
513
514 /*
515 * Nothing should have been stuffed into the workqueue during
516 * the suspend->resume cycle. If this WARN is seen then there
517 * is a bug with either the driver suspend or something in
518 * mac80211 stuffing into the workqueue which we haven't yet
519 * cleared during mac80211's suspend cycle.
520 */
521 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
522 {
523 if (WARN(local->suspended, "queueing ieee80211 work while "
524 "going to suspend\n"))
525 return false;
526
527 return true;
528 }
529
530 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
531 {
532 struct ieee80211_local *local = hw_to_local(hw);
533
534 if (!ieee80211_can_queue_work(local))
535 return;
536
537 queue_work(local->workqueue, work);
538 }
539 EXPORT_SYMBOL(ieee80211_queue_work);
540
541 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
542 struct delayed_work *dwork,
543 unsigned long delay)
544 {
545 struct ieee80211_local *local = hw_to_local(hw);
546
547 if (!ieee80211_can_queue_work(local))
548 return;
549
550 queue_delayed_work(local->workqueue, dwork, delay);
551 }
552 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
553
554 void ieee802_11_parse_elems(u8 *start, size_t len,
555 struct ieee802_11_elems *elems)
556 {
557 ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
558 }
559
560 u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
561 struct ieee802_11_elems *elems,
562 u64 filter, u32 crc)
563 {
564 size_t left = len;
565 u8 *pos = start;
566 bool calc_crc = filter != 0;
567
568 memset(elems, 0, sizeof(*elems));
569 elems->ie_start = start;
570 elems->total_len = len;
571
572 while (left >= 2) {
573 u8 id, elen;
574
575 id = *pos++;
576 elen = *pos++;
577 left -= 2;
578
579 if (elen > left)
580 break;
581
582 if (calc_crc && id < 64 && (filter & BIT(id)))
583 crc = crc32_be(crc, pos - 2, elen + 2);
584
585 switch (id) {
586 case WLAN_EID_SSID:
587 elems->ssid = pos;
588 elems->ssid_len = elen;
589 break;
590 case WLAN_EID_SUPP_RATES:
591 elems->supp_rates = pos;
592 elems->supp_rates_len = elen;
593 break;
594 case WLAN_EID_FH_PARAMS:
595 elems->fh_params = pos;
596 elems->fh_params_len = elen;
597 break;
598 case WLAN_EID_DS_PARAMS:
599 elems->ds_params = pos;
600 elems->ds_params_len = elen;
601 break;
602 case WLAN_EID_CF_PARAMS:
603 elems->cf_params = pos;
604 elems->cf_params_len = elen;
605 break;
606 case WLAN_EID_TIM:
607 if (elen >= sizeof(struct ieee80211_tim_ie)) {
608 elems->tim = (void *)pos;
609 elems->tim_len = elen;
610 }
611 break;
612 case WLAN_EID_IBSS_PARAMS:
613 elems->ibss_params = pos;
614 elems->ibss_params_len = elen;
615 break;
616 case WLAN_EID_CHALLENGE:
617 elems->challenge = pos;
618 elems->challenge_len = elen;
619 break;
620 case WLAN_EID_VENDOR_SPECIFIC:
621 if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
622 pos[2] == 0xf2) {
623 /* Microsoft OUI (00:50:F2) */
624
625 if (calc_crc)
626 crc = crc32_be(crc, pos - 2, elen + 2);
627
628 if (pos[3] == 1) {
629 /* OUI Type 1 - WPA IE */
630 elems->wpa = pos;
631 elems->wpa_len = elen;
632 } else if (elen >= 5 && pos[3] == 2) {
633 /* OUI Type 2 - WMM IE */
634 if (pos[4] == 0) {
635 elems->wmm_info = pos;
636 elems->wmm_info_len = elen;
637 } else if (pos[4] == 1) {
638 elems->wmm_param = pos;
639 elems->wmm_param_len = elen;
640 }
641 }
642 }
643 break;
644 case WLAN_EID_RSN:
645 elems->rsn = pos;
646 elems->rsn_len = elen;
647 break;
648 case WLAN_EID_ERP_INFO:
649 elems->erp_info = pos;
650 elems->erp_info_len = elen;
651 break;
652 case WLAN_EID_EXT_SUPP_RATES:
653 elems->ext_supp_rates = pos;
654 elems->ext_supp_rates_len = elen;
655 break;
656 case WLAN_EID_HT_CAPABILITY:
657 if (elen >= sizeof(struct ieee80211_ht_cap))
658 elems->ht_cap_elem = (void *)pos;
659 break;
660 case WLAN_EID_HT_INFORMATION:
661 if (elen >= sizeof(struct ieee80211_ht_info))
662 elems->ht_info_elem = (void *)pos;
663 break;
664 case WLAN_EID_MESH_ID:
665 elems->mesh_id = pos;
666 elems->mesh_id_len = elen;
667 break;
668 case WLAN_EID_MESH_CONFIG:
669 elems->mesh_config = pos;
670 elems->mesh_config_len = elen;
671 break;
672 case WLAN_EID_PEER_LINK:
673 elems->peer_link = pos;
674 elems->peer_link_len = elen;
675 break;
676 case WLAN_EID_PREQ:
677 elems->preq = pos;
678 elems->preq_len = elen;
679 break;
680 case WLAN_EID_PREP:
681 elems->prep = pos;
682 elems->prep_len = elen;
683 break;
684 case WLAN_EID_PERR:
685 elems->perr = pos;
686 elems->perr_len = elen;
687 break;
688 case WLAN_EID_CHANNEL_SWITCH:
689 elems->ch_switch_elem = pos;
690 elems->ch_switch_elem_len = elen;
691 break;
692 case WLAN_EID_QUIET:
693 if (!elems->quiet_elem) {
694 elems->quiet_elem = pos;
695 elems->quiet_elem_len = elen;
696 }
697 elems->num_of_quiet_elem++;
698 break;
699 case WLAN_EID_COUNTRY:
700 elems->country_elem = pos;
701 elems->country_elem_len = elen;
702 break;
703 case WLAN_EID_PWR_CONSTRAINT:
704 elems->pwr_constr_elem = pos;
705 elems->pwr_constr_elem_len = elen;
706 break;
707 case WLAN_EID_TIMEOUT_INTERVAL:
708 elems->timeout_int = pos;
709 elems->timeout_int_len = elen;
710 break;
711 default:
712 break;
713 }
714
715 left -= elen;
716 pos += elen;
717 }
718
719 return crc;
720 }
721
722 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata)
723 {
724 struct ieee80211_local *local = sdata->local;
725 struct ieee80211_tx_queue_params qparam;
726 int queue;
727 bool use_11b;
728 int aCWmin, aCWmax;
729
730 if (!local->ops->conf_tx)
731 return;
732
733 memset(&qparam, 0, sizeof(qparam));
734
735 use_11b = (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) &&
736 !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
737
738 for (queue = 0; queue < local_to_hw(local)->queues; queue++) {
739 /* Set defaults according to 802.11-2007 Table 7-37 */
740 aCWmax = 1023;
741 if (use_11b)
742 aCWmin = 31;
743 else
744 aCWmin = 15;
745
746 switch (queue) {
747 case 3: /* AC_BK */
748 qparam.cw_max = aCWmax;
749 qparam.cw_min = aCWmin;
750 qparam.txop = 0;
751 qparam.aifs = 7;
752 break;
753 default: /* never happens but let's not leave undefined */
754 case 2: /* AC_BE */
755 qparam.cw_max = aCWmax;
756 qparam.cw_min = aCWmin;
757 qparam.txop = 0;
758 qparam.aifs = 3;
759 break;
760 case 1: /* AC_VI */
761 qparam.cw_max = aCWmin;
762 qparam.cw_min = (aCWmin + 1) / 2 - 1;
763 if (use_11b)
764 qparam.txop = 6016/32;
765 else
766 qparam.txop = 3008/32;
767 qparam.aifs = 2;
768 break;
769 case 0: /* AC_VO */
770 qparam.cw_max = (aCWmin + 1) / 2 - 1;
771 qparam.cw_min = (aCWmin + 1) / 4 - 1;
772 if (use_11b)
773 qparam.txop = 3264/32;
774 else
775 qparam.txop = 1504/32;
776 qparam.aifs = 2;
777 break;
778 }
779
780 drv_conf_tx(local, queue, &qparam);
781 }
782 }
783
784 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
785 const size_t supp_rates_len,
786 const u8 *supp_rates)
787 {
788 struct ieee80211_local *local = sdata->local;
789 int i, have_higher_than_11mbit = 0;
790
791 /* cf. IEEE 802.11 9.2.12 */
792 for (i = 0; i < supp_rates_len; i++)
793 if ((supp_rates[i] & 0x7f) * 5 > 110)
794 have_higher_than_11mbit = 1;
795
796 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
797 have_higher_than_11mbit)
798 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
799 else
800 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
801
802 ieee80211_set_wmm_default(sdata);
803 }
804
805 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
806 enum ieee80211_band band)
807 {
808 struct ieee80211_supported_band *sband;
809 struct ieee80211_rate *bitrates;
810 u32 mandatory_rates;
811 enum ieee80211_rate_flags mandatory_flag;
812 int i;
813
814 sband = local->hw.wiphy->bands[band];
815 if (!sband) {
816 WARN_ON(1);
817 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
818 }
819
820 if (band == IEEE80211_BAND_2GHZ)
821 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
822 else
823 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
824
825 bitrates = sband->bitrates;
826 mandatory_rates = 0;
827 for (i = 0; i < sband->n_bitrates; i++)
828 if (bitrates[i].flags & mandatory_flag)
829 mandatory_rates |= BIT(i);
830 return mandatory_rates;
831 }
832
833 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
834 u16 transaction, u16 auth_alg,
835 u8 *extra, size_t extra_len, const u8 *bssid,
836 const u8 *key, u8 key_len, u8 key_idx)
837 {
838 struct ieee80211_local *local = sdata->local;
839 struct sk_buff *skb;
840 struct ieee80211_mgmt *mgmt;
841 int err;
842
843 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
844 sizeof(*mgmt) + 6 + extra_len);
845 if (!skb) {
846 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
847 "frame\n", sdata->dev->name);
848 return;
849 }
850 skb_reserve(skb, local->hw.extra_tx_headroom);
851
852 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
853 memset(mgmt, 0, 24 + 6);
854 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
855 IEEE80211_STYPE_AUTH);
856 memcpy(mgmt->da, bssid, ETH_ALEN);
857 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
858 memcpy(mgmt->bssid, bssid, ETH_ALEN);
859 mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
860 mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
861 mgmt->u.auth.status_code = cpu_to_le16(0);
862 if (extra)
863 memcpy(skb_put(skb, extra_len), extra, extra_len);
864
865 if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
866 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
867 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
868 WARN_ON(err);
869 }
870
871 ieee80211_tx_skb(sdata, skb, 0);
872 }
873
874 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
875 const u8 *ie, size_t ie_len)
876 {
877 struct ieee80211_supported_band *sband;
878 u8 *pos, *supp_rates_len, *esupp_rates_len = NULL;
879 int i;
880
881 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
882
883 pos = buffer;
884
885 *pos++ = WLAN_EID_SUPP_RATES;
886 supp_rates_len = pos;
887 *pos++ = 0;
888
889 for (i = 0; i < sband->n_bitrates; i++) {
890 struct ieee80211_rate *rate = &sband->bitrates[i];
891
892 if (esupp_rates_len) {
893 *esupp_rates_len += 1;
894 } else if (*supp_rates_len == 8) {
895 *pos++ = WLAN_EID_EXT_SUPP_RATES;
896 esupp_rates_len = pos;
897 *pos++ = 1;
898 } else
899 *supp_rates_len += 1;
900
901 *pos++ = rate->bitrate / 5;
902 }
903
904 if (sband->ht_cap.ht_supported) {
905 __le16 tmp = cpu_to_le16(sband->ht_cap.cap);
906
907 *pos++ = WLAN_EID_HT_CAPABILITY;
908 *pos++ = sizeof(struct ieee80211_ht_cap);
909 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
910 memcpy(pos, &tmp, sizeof(u16));
911 pos += sizeof(u16);
912 /* TODO: needs a define here for << 2 */
913 *pos++ = sband->ht_cap.ampdu_factor |
914 (sband->ht_cap.ampdu_density << 2);
915 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
916 pos += sizeof(sband->ht_cap.mcs);
917 pos += 2 + 4 + 1; /* ext info, BF cap, antsel */
918 }
919
920 /*
921 * If adding more here, adjust code in main.c
922 * that calculates local->scan_ies_len.
923 */
924
925 if (ie) {
926 memcpy(pos, ie, ie_len);
927 pos += ie_len;
928 }
929
930 return pos - buffer;
931 }
932
933 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
934 const u8 *ssid, size_t ssid_len,
935 const u8 *ie, size_t ie_len)
936 {
937 struct ieee80211_local *local = sdata->local;
938 struct sk_buff *skb;
939 struct ieee80211_mgmt *mgmt;
940 u8 *pos;
941
942 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200 +
943 ie_len);
944 if (!skb) {
945 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
946 "request\n", sdata->dev->name);
947 return;
948 }
949 skb_reserve(skb, local->hw.extra_tx_headroom);
950
951 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
952 memset(mgmt, 0, 24);
953 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
954 IEEE80211_STYPE_PROBE_REQ);
955 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
956 if (dst) {
957 memcpy(mgmt->da, dst, ETH_ALEN);
958 memcpy(mgmt->bssid, dst, ETH_ALEN);
959 } else {
960 memset(mgmt->da, 0xff, ETH_ALEN);
961 memset(mgmt->bssid, 0xff, ETH_ALEN);
962 }
963 pos = skb_put(skb, 2 + ssid_len);
964 *pos++ = WLAN_EID_SSID;
965 *pos++ = ssid_len;
966 memcpy(pos, ssid, ssid_len);
967 pos += ssid_len;
968
969 skb_put(skb, ieee80211_build_preq_ies(local, pos, ie, ie_len));
970
971 ieee80211_tx_skb(sdata, skb, 0);
972 }
973
974 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
975 struct ieee802_11_elems *elems,
976 enum ieee80211_band band)
977 {
978 struct ieee80211_supported_band *sband;
979 struct ieee80211_rate *bitrates;
980 size_t num_rates;
981 u32 supp_rates;
982 int i, j;
983 sband = local->hw.wiphy->bands[band];
984
985 if (!sband) {
986 WARN_ON(1);
987 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
988 }
989
990 bitrates = sband->bitrates;
991 num_rates = sband->n_bitrates;
992 supp_rates = 0;
993 for (i = 0; i < elems->supp_rates_len +
994 elems->ext_supp_rates_len; i++) {
995 u8 rate = 0;
996 int own_rate;
997 if (i < elems->supp_rates_len)
998 rate = elems->supp_rates[i];
999 else if (elems->ext_supp_rates)
1000 rate = elems->ext_supp_rates
1001 [i - elems->supp_rates_len];
1002 own_rate = 5 * (rate & 0x7f);
1003 for (j = 0; j < num_rates; j++)
1004 if (bitrates[j].bitrate == own_rate)
1005 supp_rates |= BIT(j);
1006 }
1007 return supp_rates;
1008 }
1009
1010 void ieee80211_stop_device(struct ieee80211_local *local)
1011 {
1012 ieee80211_led_radio(local, false);
1013
1014 cancel_work_sync(&local->reconfig_filter);
1015 drv_stop(local);
1016
1017 flush_workqueue(local->workqueue);
1018 }
1019
1020 int ieee80211_reconfig(struct ieee80211_local *local)
1021 {
1022 struct ieee80211_hw *hw = &local->hw;
1023 struct ieee80211_sub_if_data *sdata;
1024 struct ieee80211_if_init_conf conf;
1025 struct sta_info *sta;
1026 unsigned long flags;
1027 int res;
1028 bool from_suspend = local->suspended;
1029
1030 /*
1031 * We're going to start the hardware, at that point
1032 * we are no longer suspended and can RX frames.
1033 */
1034 local->suspended = false;
1035
1036 /* restart hardware */
1037 if (local->open_count) {
1038 res = drv_start(local);
1039
1040 ieee80211_led_radio(local, true);
1041 }
1042
1043 /* add interfaces */
1044 list_for_each_entry(sdata, &local->interfaces, list) {
1045 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1046 sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1047 netif_running(sdata->dev)) {
1048 conf.vif = &sdata->vif;
1049 conf.type = sdata->vif.type;
1050 conf.mac_addr = sdata->dev->dev_addr;
1051 res = drv_add_interface(local, &conf);
1052 }
1053 }
1054
1055 /* add STAs back */
1056 if (local->ops->sta_notify) {
1057 spin_lock_irqsave(&local->sta_lock, flags);
1058 list_for_each_entry(sta, &local->sta_list, list) {
1059 sdata = sta->sdata;
1060 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1061 sdata = container_of(sdata->bss,
1062 struct ieee80211_sub_if_data,
1063 u.ap);
1064
1065 drv_sta_notify(local, &sdata->vif, STA_NOTIFY_ADD,
1066 &sta->sta);
1067 }
1068 spin_unlock_irqrestore(&local->sta_lock, flags);
1069 }
1070
1071 /* Clear Suspend state so that ADDBA requests can be processed */
1072
1073 rcu_read_lock();
1074
1075 if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1076 list_for_each_entry_rcu(sta, &local->sta_list, list) {
1077 clear_sta_flags(sta, WLAN_STA_SUSPEND);
1078 }
1079 }
1080
1081 rcu_read_unlock();
1082
1083 /* setup RTS threshold */
1084 drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1085
1086 /* reconfigure hardware */
1087 ieee80211_hw_config(local, ~0);
1088
1089 ieee80211_configure_filter(local);
1090
1091 /* Finally also reconfigure all the BSS information */
1092 list_for_each_entry(sdata, &local->interfaces, list) {
1093 u32 changed = ~0;
1094 if (!netif_running(sdata->dev))
1095 continue;
1096 switch (sdata->vif.type) {
1097 case NL80211_IFTYPE_STATION:
1098 /* disable beacon change bits */
1099 changed &= ~(BSS_CHANGED_BEACON |
1100 BSS_CHANGED_BEACON_ENABLED);
1101 /* fall through */
1102 case NL80211_IFTYPE_ADHOC:
1103 case NL80211_IFTYPE_AP:
1104 case NL80211_IFTYPE_MESH_POINT:
1105 ieee80211_bss_info_change_notify(sdata, changed);
1106 break;
1107 case NL80211_IFTYPE_WDS:
1108 break;
1109 case NL80211_IFTYPE_AP_VLAN:
1110 case NL80211_IFTYPE_MONITOR:
1111 /* ignore virtual */
1112 break;
1113 case NL80211_IFTYPE_UNSPECIFIED:
1114 case __NL80211_IFTYPE_AFTER_LAST:
1115 WARN_ON(1);
1116 break;
1117 }
1118 }
1119
1120 /* add back keys */
1121 list_for_each_entry(sdata, &local->interfaces, list)
1122 if (netif_running(sdata->dev))
1123 ieee80211_enable_keys(sdata);
1124
1125 ieee80211_wake_queues_by_reason(hw,
1126 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1127
1128 /*
1129 * If this is for hw restart things are still running.
1130 * We may want to change that later, however.
1131 */
1132 if (!from_suspend)
1133 return 0;
1134
1135 #ifdef CONFIG_PM
1136 local->suspended = false;
1137
1138 list_for_each_entry(sdata, &local->interfaces, list) {
1139 switch(sdata->vif.type) {
1140 case NL80211_IFTYPE_STATION:
1141 ieee80211_sta_restart(sdata);
1142 break;
1143 case NL80211_IFTYPE_ADHOC:
1144 ieee80211_ibss_restart(sdata);
1145 break;
1146 case NL80211_IFTYPE_MESH_POINT:
1147 ieee80211_mesh_restart(sdata);
1148 break;
1149 default:
1150 break;
1151 }
1152 }
1153
1154 add_timer(&local->sta_cleanup);
1155
1156 spin_lock_irqsave(&local->sta_lock, flags);
1157 list_for_each_entry(sta, &local->sta_list, list)
1158 mesh_plink_restart(sta);
1159 spin_unlock_irqrestore(&local->sta_lock, flags);
1160 #else
1161 WARN_ON(1);
1162 #endif
1163 return 0;
1164 }
1165
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