?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
ref_counter --> kref conversation
[cor_2_6_31.git] / net / mac80211 / util.c
blob915e77769312ea85aace93ca1f20910ea9342a4c
1 /*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 * utilities for mac80211
12 */
13
14 #include <net/mac80211.h>
15 #include <linux/netdevice.h>
16 #include <linux/types.h>
17 #include <linux/slab.h>
18 #include <linux/skbuff.h>
19 #include <linux/etherdevice.h>
20 #include <linux/if_arp.h>
21 #include <linux/wireless.h>
22 #include <linux/bitmap.h>
23 #include <linux/crc32.h>
24 #include <net/net_namespace.h>
25 #include <net/cfg80211.h>
26 #include <net/rtnetlink.h>
27
28 #include "ieee80211_i.h"
29 #include "driver-ops.h"
30 #include "rate.h"
31 #include "mesh.h"
32 #include "wme.h"
33 #include "led.h"
34
35 /* privid for wiphys to determine whether they belong to us or not */
36 void *mac80211_wiphy_privid = &mac80211_wiphy_privid;
37
38 struct ieee80211_hw *wiphy_to_ieee80211_hw(struct wiphy *wiphy)
39 {
40 struct ieee80211_local *local;
41 BUG_ON(!wiphy);
42
43 local = wiphy_priv(wiphy);
44 return &local->hw;
45 }
46 EXPORT_SYMBOL(wiphy_to_ieee80211_hw);
47
48 u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
49 enum nl80211_iftype type)
50 {
51 __le16 fc = hdr->frame_control;
52
53 /* drop ACK/CTS frames and incorrect hdr len (ctrl) */
54 if (len < 16)
55 return NULL;
56
57 if (ieee80211_is_data(fc)) {
58 if (len < 24) /* drop incorrect hdr len (data) */
59 return NULL;
60
61 if (ieee80211_has_a4(fc))
62 return NULL;
63 if (ieee80211_has_tods(fc))
64 return hdr->addr1;
65 if (ieee80211_has_fromds(fc))
66 return hdr->addr2;
67
68 return hdr->addr3;
69 }
70
71 if (ieee80211_is_mgmt(fc)) {
72 if (len < 24) /* drop incorrect hdr len (mgmt) */
73 return NULL;
74 return hdr->addr3;
75 }
76
77 if (ieee80211_is_ctl(fc)) {
78 if(ieee80211_is_pspoll(fc))
79 return hdr->addr1;
80
81 if (ieee80211_is_back_req(fc)) {
82 switch (type) {
83 case NL80211_IFTYPE_STATION:
84 return hdr->addr2;
85 case NL80211_IFTYPE_AP:
86 case NL80211_IFTYPE_AP_VLAN:
87 return hdr->addr1;
88 default:
89 break; /* fall through to the return */
90 }
91 }
92 }
93
94 return NULL;
95 }
96
97 void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
98 {
99 struct sk_buff *skb = tx->skb;
100 struct ieee80211_hdr *hdr;
101
102 do {
103 hdr = (struct ieee80211_hdr *) skb->data;
104 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
105 } while ((skb = skb->next));
106 }
107
108 int ieee80211_frame_duration(struct ieee80211_local *local, size_t len,
109 int rate, int erp, int short_preamble)
110 {
111 int dur;
112
113 /* calculate duration (in microseconds, rounded up to next higher
114 * integer if it includes a fractional microsecond) to send frame of
115 * len bytes (does not include FCS) at the given rate. Duration will
116 * also include SIFS.
117 *
118 * rate is in 100 kbps, so divident is multiplied by 10 in the
119 * DIV_ROUND_UP() operations.
120 */
121
122 if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ || erp) {
123 /*
124 * OFDM:
125 *
126 * N_DBPS = DATARATE x 4
127 * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
128 * (16 = SIGNAL time, 6 = tail bits)
129 * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
130 *
131 * T_SYM = 4 usec
132 * 802.11a - 17.5.2: aSIFSTime = 16 usec
133 * 802.11g - 19.8.4: aSIFSTime = 10 usec +
134 * signal ext = 6 usec
135 */
136 dur = 16; /* SIFS + signal ext */
137 dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */
138 dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */
139 dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
140 4 * rate); /* T_SYM x N_SYM */
141 } else {
142 /*
143 * 802.11b or 802.11g with 802.11b compatibility:
144 * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
145 * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
146 *
147 * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
148 * aSIFSTime = 10 usec
149 * aPreambleLength = 144 usec or 72 usec with short preamble
150 * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
151 */
152 dur = 10; /* aSIFSTime = 10 usec */
153 dur += short_preamble ? (72 + 24) : (144 + 48);
154
155 dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
156 }
157
158 return dur;
159 }
160
161 /* Exported duration function for driver use */
162 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
163 struct ieee80211_vif *vif,
164 size_t frame_len,
165 struct ieee80211_rate *rate)
166 {
167 struct ieee80211_local *local = hw_to_local(hw);
168 struct ieee80211_sub_if_data *sdata;
169 u16 dur;
170 int erp;
171 bool short_preamble = false;
172
173 erp = 0;
174 if (vif) {
175 sdata = vif_to_sdata(vif);
176 short_preamble = sdata->vif.bss_conf.use_short_preamble;
177 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
178 erp = rate->flags & IEEE80211_RATE_ERP_G;
179 }
180
181 dur = ieee80211_frame_duration(local, frame_len, rate->bitrate, erp,
182 short_preamble);
183
184 return cpu_to_le16(dur);
185 }
186 EXPORT_SYMBOL(ieee80211_generic_frame_duration);
187
188 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
189 struct ieee80211_vif *vif, size_t frame_len,
190 const struct ieee80211_tx_info *frame_txctl)
191 {
192 struct ieee80211_local *local = hw_to_local(hw);
193 struct ieee80211_rate *rate;
194 struct ieee80211_sub_if_data *sdata;
195 bool short_preamble;
196 int erp;
197 u16 dur;
198 struct ieee80211_supported_band *sband;
199
200 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
201
202 short_preamble = false;
203
204 rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
205
206 erp = 0;
207 if (vif) {
208 sdata = vif_to_sdata(vif);
209 short_preamble = sdata->vif.bss_conf.use_short_preamble;
210 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
211 erp = rate->flags & IEEE80211_RATE_ERP_G;
212 }
213
214 /* CTS duration */
215 dur = ieee80211_frame_duration(local, 10, rate->bitrate,
216 erp, short_preamble);
217 /* Data frame duration */
218 dur += ieee80211_frame_duration(local, frame_len, rate->bitrate,
219 erp, short_preamble);
220 /* ACK duration */
221 dur += ieee80211_frame_duration(local, 10, rate->bitrate,
222 erp, short_preamble);
223
224 return cpu_to_le16(dur);
225 }
226 EXPORT_SYMBOL(ieee80211_rts_duration);
227
228 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
229 struct ieee80211_vif *vif,
230 size_t frame_len,
231 const struct ieee80211_tx_info *frame_txctl)
232 {
233 struct ieee80211_local *local = hw_to_local(hw);
234 struct ieee80211_rate *rate;
235 struct ieee80211_sub_if_data *sdata;
236 bool short_preamble;
237 int erp;
238 u16 dur;
239 struct ieee80211_supported_band *sband;
240
241 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
242
243 short_preamble = false;
244
245 rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
246 erp = 0;
247 if (vif) {
248 sdata = vif_to_sdata(vif);
249 short_preamble = sdata->vif.bss_conf.use_short_preamble;
250 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
251 erp = rate->flags & IEEE80211_RATE_ERP_G;
252 }
253
254 /* Data frame duration */
255 dur = ieee80211_frame_duration(local, frame_len, rate->bitrate,
256 erp, short_preamble);
257 if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
258 /* ACK duration */
259 dur += ieee80211_frame_duration(local, 10, rate->bitrate,
260 erp, short_preamble);
261 }
262
263 return cpu_to_le16(dur);
264 }
265 EXPORT_SYMBOL(ieee80211_ctstoself_duration);
266
267 static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
268 enum queue_stop_reason reason)
269 {
270 struct ieee80211_local *local = hw_to_local(hw);
271
272 if (WARN_ON(queue >= hw->queues))
273 return;
274
275 __clear_bit(reason, &local->queue_stop_reasons[queue]);
276
277 if (!skb_queue_empty(&local->pending[queue]) &&
278 local->queue_stop_reasons[queue] ==
279 BIT(IEEE80211_QUEUE_STOP_REASON_PENDING))
280 tasklet_schedule(&local->tx_pending_tasklet);
281
282 if (local->queue_stop_reasons[queue] != 0)
283 /* someone still has this queue stopped */
284 return;
285
286 netif_wake_subqueue(local->mdev, queue);
287 }
288
289 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
290 enum queue_stop_reason reason)
291 {
292 struct ieee80211_local *local = hw_to_local(hw);
293 unsigned long flags;
294
295 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
296 __ieee80211_wake_queue(hw, queue, reason);
297 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
298 }
299
300 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
301 {
302 ieee80211_wake_queue_by_reason(hw, queue,
303 IEEE80211_QUEUE_STOP_REASON_DRIVER);
304 }
305 EXPORT_SYMBOL(ieee80211_wake_queue);
306
307 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
308 enum queue_stop_reason reason)
309 {
310 struct ieee80211_local *local = hw_to_local(hw);
311
312 if (WARN_ON(queue >= hw->queues))
313 return;
314
315 /*
316 * Only stop if it was previously running, this is necessary
317 * for correct pending packets handling because there we may
318 * start (but not wake) the queue and rely on that.
319 */
320 if (!local->queue_stop_reasons[queue])
321 netif_stop_subqueue(local->mdev, queue);
322
323 __set_bit(reason, &local->queue_stop_reasons[queue]);
324 }
325
326 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
327 enum queue_stop_reason reason)
328 {
329 struct ieee80211_local *local = hw_to_local(hw);
330 unsigned long flags;
331
332 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
333 __ieee80211_stop_queue(hw, queue, reason);
334 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
335 }
336
337 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
338 {
339 ieee80211_stop_queue_by_reason(hw, queue,
340 IEEE80211_QUEUE_STOP_REASON_DRIVER);
341 }
342 EXPORT_SYMBOL(ieee80211_stop_queue);
343
344 void ieee80211_add_pending_skb(struct ieee80211_local *local,
345 struct sk_buff *skb)
346 {
347 struct ieee80211_hw *hw = &local->hw;
348 unsigned long flags;
349 int queue = skb_get_queue_mapping(skb);
350
351 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
352 __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
353 __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_PENDING);
354 skb_queue_tail(&local->pending[queue], skb);
355 __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
356 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
357 }
358
359 int ieee80211_add_pending_skbs(struct ieee80211_local *local,
360 struct sk_buff_head *skbs)
361 {
362 struct ieee80211_hw *hw = &local->hw;
363 struct sk_buff *skb;
364 unsigned long flags;
365 int queue, ret = 0, i;
366
367 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
368 for (i = 0; i < hw->queues; i++)
369 __ieee80211_stop_queue(hw, i,
370 IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
371
372 while ((skb = skb_dequeue(skbs))) {
373 ret++;
374 queue = skb_get_queue_mapping(skb);
375 skb_queue_tail(&local->pending[queue], skb);
376 }
377
378 for (i = 0; i < hw->queues; i++) {
379 if (ret)
380 __ieee80211_stop_queue(hw, i,
381 IEEE80211_QUEUE_STOP_REASON_PENDING);
382 __ieee80211_wake_queue(hw, i,
383 IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
384 }
385 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
386
387 return ret;
388 }
389
390 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
391 enum queue_stop_reason reason)
392 {
393 struct ieee80211_local *local = hw_to_local(hw);
394 unsigned long flags;
395 int i;
396
397 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
398
399 for (i = 0; i < hw->queues; i++)
400 __ieee80211_stop_queue(hw, i, reason);
401
402 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
403 }
404
405 void ieee80211_stop_queues(struct ieee80211_hw *hw)
406 {
407 ieee80211_stop_queues_by_reason(hw,
408 IEEE80211_QUEUE_STOP_REASON_DRIVER);
409 }
410 EXPORT_SYMBOL(ieee80211_stop_queues);
411
412 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
413 {
414 struct ieee80211_local *local = hw_to_local(hw);
415
416 if (WARN_ON(queue >= hw->queues))
417 return true;
418
419 return __netif_subqueue_stopped(local->mdev, queue);
420 }
421 EXPORT_SYMBOL(ieee80211_queue_stopped);
422
423 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
424 enum queue_stop_reason reason)
425 {
426 struct ieee80211_local *local = hw_to_local(hw);
427 unsigned long flags;
428 int i;
429
430 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
431
432 for (i = 0; i < hw->queues; i++)
433 __ieee80211_wake_queue(hw, i, reason);
434
435 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
436 }
437
438 void ieee80211_wake_queues(struct ieee80211_hw *hw)
439 {
440 ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
441 }
442 EXPORT_SYMBOL(ieee80211_wake_queues);
443
444 void ieee80211_iterate_active_interfaces(
445 struct ieee80211_hw *hw,
446 void (*iterator)(void *data, u8 *mac,
447 struct ieee80211_vif *vif),
448 void *data)
449 {
450 struct ieee80211_local *local = hw_to_local(hw);
451 struct ieee80211_sub_if_data *sdata;
452
453 mutex_lock(&local->iflist_mtx);
454
455 list_for_each_entry(sdata, &local->interfaces, list) {
456 switch (sdata->vif.type) {
457 case __NL80211_IFTYPE_AFTER_LAST:
458 case NL80211_IFTYPE_UNSPECIFIED:
459 case NL80211_IFTYPE_MONITOR:
460 case NL80211_IFTYPE_AP_VLAN:
461 continue;
462 case NL80211_IFTYPE_AP:
463 case NL80211_IFTYPE_STATION:
464 case NL80211_IFTYPE_ADHOC:
465 case NL80211_IFTYPE_WDS:
466 case NL80211_IFTYPE_MESH_POINT:
467 break;
468 }
469 if (netif_running(sdata->dev))
470 iterator(data, sdata->dev->dev_addr,
471 &sdata->vif);
472 }
473
474 mutex_unlock(&local->iflist_mtx);
475 }
476 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
477
478 void ieee80211_iterate_active_interfaces_atomic(
479 struct ieee80211_hw *hw,
480 void (*iterator)(void *data, u8 *mac,
481 struct ieee80211_vif *vif),
482 void *data)
483 {
484 struct ieee80211_local *local = hw_to_local(hw);
485 struct ieee80211_sub_if_data *sdata;
486
487 rcu_read_lock();
488
489 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
490 switch (sdata->vif.type) {
491 case __NL80211_IFTYPE_AFTER_LAST:
492 case NL80211_IFTYPE_UNSPECIFIED:
493 case NL80211_IFTYPE_MONITOR:
494 case NL80211_IFTYPE_AP_VLAN:
495 continue;
496 case NL80211_IFTYPE_AP:
497 case NL80211_IFTYPE_STATION:
498 case NL80211_IFTYPE_ADHOC:
499 case NL80211_IFTYPE_WDS:
500 case NL80211_IFTYPE_MESH_POINT:
501 break;
502 }
503 if (netif_running(sdata->dev))
504 iterator(data, sdata->dev->dev_addr,
505 &sdata->vif);
506 }
507
508 rcu_read_unlock();
509 }
510 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
511
512 void ieee802_11_parse_elems(u8 *start, size_t len,
513 struct ieee802_11_elems *elems)
514 {
515 ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
516 }
517
518 u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
519 struct ieee802_11_elems *elems,
520 u64 filter, u32 crc)
521 {
522 size_t left = len;
523 u8 *pos = start;
524 bool calc_crc = filter != 0;
525
526 memset(elems, 0, sizeof(*elems));
527 elems->ie_start = start;
528 elems->total_len = len;
529
530 while (left >= 2) {
531 u8 id, elen;
532
533 id = *pos++;
534 elen = *pos++;
535 left -= 2;
536
537 if (elen > left)
538 break;
539
540 if (calc_crc && id < 64 && (filter & BIT(id)))
541 crc = crc32_be(crc, pos - 2, elen + 2);
542
543 switch (id) {
544 case WLAN_EID_SSID:
545 elems->ssid = pos;
546 elems->ssid_len = elen;
547 break;
548 case WLAN_EID_SUPP_RATES:
549 elems->supp_rates = pos;
550 elems->supp_rates_len = elen;
551 break;
552 case WLAN_EID_FH_PARAMS:
553 elems->fh_params = pos;
554 elems->fh_params_len = elen;
555 break;
556 case WLAN_EID_DS_PARAMS:
557 elems->ds_params = pos;
558 elems->ds_params_len = elen;
559 break;
560 case WLAN_EID_CF_PARAMS:
561 elems->cf_params = pos;
562 elems->cf_params_len = elen;
563 break;
564 case WLAN_EID_TIM:
565 if (elen >= sizeof(struct ieee80211_tim_ie)) {
566 elems->tim = (void *)pos;
567 elems->tim_len = elen;
568 }
569 break;
570 case WLAN_EID_IBSS_PARAMS:
571 elems->ibss_params = pos;
572 elems->ibss_params_len = elen;
573 break;
574 case WLAN_EID_CHALLENGE:
575 elems->challenge = pos;
576 elems->challenge_len = elen;
577 break;
578 case WLAN_EID_VENDOR_SPECIFIC:
579 if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
580 pos[2] == 0xf2) {
581 /* Microsoft OUI (00:50:F2) */
582
583 if (calc_crc)
584 crc = crc32_be(crc, pos - 2, elen + 2);
585
586 if (pos[3] == 1) {
587 /* OUI Type 1 - WPA IE */
588 elems->wpa = pos;
589 elems->wpa_len = elen;
590 } else if (elen >= 5 && pos[3] == 2) {
591 /* OUI Type 2 - WMM IE */
592 if (pos[4] == 0) {
593 elems->wmm_info = pos;
594 elems->wmm_info_len = elen;
595 } else if (pos[4] == 1) {
596 elems->wmm_param = pos;
597 elems->wmm_param_len = elen;
598 }
599 }
600 }
601 break;
602 case WLAN_EID_RSN:
603 elems->rsn = pos;
604 elems->rsn_len = elen;
605 break;
606 case WLAN_EID_ERP_INFO:
607 elems->erp_info = pos;
608 elems->erp_info_len = elen;
609 break;
610 case WLAN_EID_EXT_SUPP_RATES:
611 elems->ext_supp_rates = pos;
612 elems->ext_supp_rates_len = elen;
613 break;
614 case WLAN_EID_HT_CAPABILITY:
615 if (elen >= sizeof(struct ieee80211_ht_cap))
616 elems->ht_cap_elem = (void *)pos;
617 break;
618 case WLAN_EID_HT_INFORMATION:
619 if (elen >= sizeof(struct ieee80211_ht_info))
620 elems->ht_info_elem = (void *)pos;
621 break;
622 case WLAN_EID_MESH_ID:
623 elems->mesh_id = pos;
624 elems->mesh_id_len = elen;
625 break;
626 case WLAN_EID_MESH_CONFIG:
627 elems->mesh_config = pos;
628 elems->mesh_config_len = elen;
629 break;
630 case WLAN_EID_PEER_LINK:
631 elems->peer_link = pos;
632 elems->peer_link_len = elen;
633 break;
634 case WLAN_EID_PREQ:
635 elems->preq = pos;
636 elems->preq_len = elen;
637 break;
638 case WLAN_EID_PREP:
639 elems->prep = pos;
640 elems->prep_len = elen;
641 break;
642 case WLAN_EID_PERR:
643 elems->perr = pos;
644 elems->perr_len = elen;
645 break;
646 case WLAN_EID_CHANNEL_SWITCH:
647 elems->ch_switch_elem = pos;
648 elems->ch_switch_elem_len = elen;
649 break;
650 case WLAN_EID_QUIET:
651 if (!elems->quiet_elem) {
652 elems->quiet_elem = pos;
653 elems->quiet_elem_len = elen;
654 }
655 elems->num_of_quiet_elem++;
656 break;
657 case WLAN_EID_COUNTRY:
658 elems->country_elem = pos;
659 elems->country_elem_len = elen;
660 break;
661 case WLAN_EID_PWR_CONSTRAINT:
662 elems->pwr_constr_elem = pos;
663 elems->pwr_constr_elem_len = elen;
664 break;
665 case WLAN_EID_TIMEOUT_INTERVAL:
666 elems->timeout_int = pos;
667 elems->timeout_int_len = elen;
668 break;
669 default:
670 break;
671 }
672
673 left -= elen;
674 pos += elen;
675 }
676
677 return crc;
678 }
679
680 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata)
681 {
682 struct ieee80211_local *local = sdata->local;
683 struct ieee80211_tx_queue_params qparam;
684 int queue;
685 bool use_11b;
686 int aCWmin, aCWmax;
687
688 if (!local->ops->conf_tx)
689 return;
690
691 memset(&qparam, 0, sizeof(qparam));
692
693 use_11b = (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) &&
694 !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
695
696 for (queue = 0; queue < local_to_hw(local)->queues; queue++) {
697 /* Set defaults according to 802.11-2007 Table 7-37 */
698 aCWmax = 1023;
699 if (use_11b)
700 aCWmin = 31;
701 else
702 aCWmin = 15;
703
704 switch (queue) {
705 case 3: /* AC_BK */
706 qparam.cw_max = aCWmax;
707 qparam.cw_min = aCWmin;
708 qparam.txop = 0;
709 qparam.aifs = 7;
710 break;
711 default: /* never happens but let's not leave undefined */
712 case 2: /* AC_BE */
713 qparam.cw_max = aCWmax;
714 qparam.cw_min = aCWmin;
715 qparam.txop = 0;
716 qparam.aifs = 3;
717 break;
718 case 1: /* AC_VI */
719 qparam.cw_max = aCWmin;
720 qparam.cw_min = (aCWmin + 1) / 2 - 1;
721 if (use_11b)
722 qparam.txop = 6016/32;
723 else
724 qparam.txop = 3008/32;
725 qparam.aifs = 2;
726 break;
727 case 0: /* AC_VO */
728 qparam.cw_max = (aCWmin + 1) / 2 - 1;
729 qparam.cw_min = (aCWmin + 1) / 4 - 1;
730 if (use_11b)
731 qparam.txop = 3264/32;
732 else
733 qparam.txop = 1504/32;
734 qparam.aifs = 2;
735 break;
736 }
737
738 drv_conf_tx(local, queue, &qparam);
739 }
740 }
741
742 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
743 const size_t supp_rates_len,
744 const u8 *supp_rates)
745 {
746 struct ieee80211_local *local = sdata->local;
747 int i, have_higher_than_11mbit = 0;
748
749 /* cf. IEEE 802.11 9.2.12 */
750 for (i = 0; i < supp_rates_len; i++)
751 if ((supp_rates[i] & 0x7f) * 5 > 110)
752 have_higher_than_11mbit = 1;
753
754 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
755 have_higher_than_11mbit)
756 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
757 else
758 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
759
760 ieee80211_set_wmm_default(sdata);
761 }
762
763 void ieee80211_tx_skb(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb,
764 int encrypt)
765 {
766 skb->dev = sdata->local->mdev;
767 skb_set_mac_header(skb, 0);
768 skb_set_network_header(skb, 0);
769 skb_set_transport_header(skb, 0);
770
771 skb->iif = sdata->dev->ifindex;
772 skb->do_not_encrypt = !encrypt;
773
774 dev_queue_xmit(skb);
775 }
776
777 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
778 enum ieee80211_band band)
779 {
780 struct ieee80211_supported_band *sband;
781 struct ieee80211_rate *bitrates;
782 u32 mandatory_rates;
783 enum ieee80211_rate_flags mandatory_flag;
784 int i;
785
786 sband = local->hw.wiphy->bands[band];
787 if (!sband) {
788 WARN_ON(1);
789 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
790 }
791
792 if (band == IEEE80211_BAND_2GHZ)
793 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
794 else
795 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
796
797 bitrates = sband->bitrates;
798 mandatory_rates = 0;
799 for (i = 0; i < sband->n_bitrates; i++)
800 if (bitrates[i].flags & mandatory_flag)
801 mandatory_rates |= BIT(i);
802 return mandatory_rates;
803 }
804
805 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
806 u16 transaction, u16 auth_alg,
807 u8 *extra, size_t extra_len,
808 const u8 *bssid, int encrypt)
809 {
810 struct ieee80211_local *local = sdata->local;
811 struct sk_buff *skb;
812 struct ieee80211_mgmt *mgmt;
813
814 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
815 sizeof(*mgmt) + 6 + extra_len);
816 if (!skb) {
817 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
818 "frame\n", sdata->dev->name);
819 return;
820 }
821 skb_reserve(skb, local->hw.extra_tx_headroom);
822
823 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
824 memset(mgmt, 0, 24 + 6);
825 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
826 IEEE80211_STYPE_AUTH);
827 if (encrypt)
828 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
829 memcpy(mgmt->da, bssid, ETH_ALEN);
830 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
831 memcpy(mgmt->bssid, bssid, ETH_ALEN);
832 mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
833 mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
834 mgmt->u.auth.status_code = cpu_to_le16(0);
835 if (extra)
836 memcpy(skb_put(skb, extra_len), extra, extra_len);
837
838 ieee80211_tx_skb(sdata, skb, encrypt);
839 }
840
841 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
842 const u8 *ie, size_t ie_len)
843 {
844 struct ieee80211_supported_band *sband;
845 u8 *pos, *supp_rates_len, *esupp_rates_len = NULL;
846 int i;
847
848 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
849
850 pos = buffer;
851
852 *pos++ = WLAN_EID_SUPP_RATES;
853 supp_rates_len = pos;
854 *pos++ = 0;
855
856 for (i = 0; i < sband->n_bitrates; i++) {
857 struct ieee80211_rate *rate = &sband->bitrates[i];
858
859 if (esupp_rates_len) {
860 *esupp_rates_len += 1;
861 } else if (*supp_rates_len == 8) {
862 *pos++ = WLAN_EID_EXT_SUPP_RATES;
863 esupp_rates_len = pos;
864 *pos++ = 1;
865 } else
866 *supp_rates_len += 1;
867
868 *pos++ = rate->bitrate / 5;
869 }
870
871 if (sband->ht_cap.ht_supported) {
872 __le16 tmp = cpu_to_le16(sband->ht_cap.cap);
873
874 *pos++ = WLAN_EID_HT_CAPABILITY;
875 *pos++ = sizeof(struct ieee80211_ht_cap);
876 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
877 memcpy(pos, &tmp, sizeof(u16));
878 pos += sizeof(u16);
879 /* TODO: needs a define here for << 2 */
880 *pos++ = sband->ht_cap.ampdu_factor |
881 (sband->ht_cap.ampdu_density << 2);
882 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
883 pos += sizeof(sband->ht_cap.mcs);
884 pos += 2 + 4 + 1; /* ext info, BF cap, antsel */
885 }
886
887 /*
888 * If adding more here, adjust code in main.c
889 * that calculates local->scan_ies_len.
890 */
891
892 if (ie) {
893 memcpy(pos, ie, ie_len);
894 pos += ie_len;
895 }
896
897 return pos - buffer;
898 }
899
900 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
901 const u8 *ssid, size_t ssid_len,
902 const u8 *ie, size_t ie_len)
903 {
904 struct ieee80211_local *local = sdata->local;
905 struct sk_buff *skb;
906 struct ieee80211_mgmt *mgmt;
907 u8 *pos;
908
909 skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*mgmt) + 200 +
910 ie_len);
911 if (!skb) {
912 printk(KERN_DEBUG "%s: failed to allocate buffer for probe "
913 "request\n", sdata->dev->name);
914 return;
915 }
916 skb_reserve(skb, local->hw.extra_tx_headroom);
917
918 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
919 memset(mgmt, 0, 24);
920 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
921 IEEE80211_STYPE_PROBE_REQ);
922 memcpy(mgmt->sa, sdata->dev->dev_addr, ETH_ALEN);
923 if (dst) {
924 memcpy(mgmt->da, dst, ETH_ALEN);
925 memcpy(mgmt->bssid, dst, ETH_ALEN);
926 } else {
927 memset(mgmt->da, 0xff, ETH_ALEN);
928 memset(mgmt->bssid, 0xff, ETH_ALEN);
929 }
930 pos = skb_put(skb, 2 + ssid_len);
931 *pos++ = WLAN_EID_SSID;
932 *pos++ = ssid_len;
933 memcpy(pos, ssid, ssid_len);
934 pos += ssid_len;
935
936 skb_put(skb, ieee80211_build_preq_ies(local, pos, ie, ie_len));
937
938 ieee80211_tx_skb(sdata, skb, 0);
939 }
940
941 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
942 struct ieee802_11_elems *elems,
943 enum ieee80211_band band)
944 {
945 struct ieee80211_supported_band *sband;
946 struct ieee80211_rate *bitrates;
947 size_t num_rates;
948 u32 supp_rates;
949 int i, j;
950 sband = local->hw.wiphy->bands[band];
951
952 if (!sband) {
953 WARN_ON(1);
954 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
955 }
956
957 bitrates = sband->bitrates;
958 num_rates = sband->n_bitrates;
959 supp_rates = 0;
960 for (i = 0; i < elems->supp_rates_len +
961 elems->ext_supp_rates_len; i++) {
962 u8 rate = 0;
963 int own_rate;
964 if (i < elems->supp_rates_len)
965 rate = elems->supp_rates[i];
966 else if (elems->ext_supp_rates)
967 rate = elems->ext_supp_rates
968 [i - elems->supp_rates_len];
969 own_rate = 5 * (rate & 0x7f);
970 for (j = 0; j < num_rates; j++)
971 if (bitrates[j].bitrate == own_rate)
972 supp_rates |= BIT(j);
973 }
974 return supp_rates;
975 }
976
977 int ieee80211_reconfig(struct ieee80211_local *local)
978 {
979 struct ieee80211_hw *hw = &local->hw;
980 struct ieee80211_sub_if_data *sdata;
981 struct ieee80211_if_init_conf conf;
982 struct sta_info *sta;
983 unsigned long flags;
984 int res;
985 bool from_suspend = local->suspended;
986
987 /*
988 * We're going to start the hardware, at that point
989 * we are no longer suspended and can RX frames.
990 */
991 local->suspended = false;
992
993 /* restart hardware */
994 if (local->open_count) {
995 res = drv_start(local);
996
997 ieee80211_led_radio(local, true);
998 }
999
1000 /* add interfaces */
1001 list_for_each_entry(sdata, &local->interfaces, list) {
1002 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1003 sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1004 netif_running(sdata->dev)) {
1005 conf.vif = &sdata->vif;
1006 conf.type = sdata->vif.type;
1007 conf.mac_addr = sdata->dev->dev_addr;
1008 res = drv_add_interface(local, &conf);
1009 }
1010 }
1011
1012 /* add STAs back */
1013 if (local->ops->sta_notify) {
1014 spin_lock_irqsave(&local->sta_lock, flags);
1015 list_for_each_entry(sta, &local->sta_list, list) {
1016 sdata = sta->sdata;
1017 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1018 sdata = container_of(sdata->bss,
1019 struct ieee80211_sub_if_data,
1020 u.ap);
1021
1022 drv_sta_notify(local, &sdata->vif, STA_NOTIFY_ADD,
1023 &sta->sta);
1024 }
1025 spin_unlock_irqrestore(&local->sta_lock, flags);
1026 }
1027
1028 /* Clear Suspend state so that ADDBA requests can be processed */
1029
1030 rcu_read_lock();
1031
1032 if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1033 list_for_each_entry_rcu(sta, &local->sta_list, list) {
1034 clear_sta_flags(sta, WLAN_STA_SUSPEND);
1035 }
1036 }
1037
1038 rcu_read_unlock();
1039
1040 /* setup RTS threshold */
1041 drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1042
1043 /* reconfigure hardware */
1044 ieee80211_hw_config(local, ~0);
1045
1046 netif_addr_lock_bh(local->mdev);
1047 ieee80211_configure_filter(local);
1048 netif_addr_unlock_bh(local->mdev);
1049
1050 /* Finally also reconfigure all the BSS information */
1051 list_for_each_entry(sdata, &local->interfaces, list) {
1052 u32 changed = ~0;
1053 if (!netif_running(sdata->dev))
1054 continue;
1055 switch (sdata->vif.type) {
1056 case NL80211_IFTYPE_STATION:
1057 /* disable beacon change bits */
1058 changed &= ~(BSS_CHANGED_BEACON |
1059 BSS_CHANGED_BEACON_ENABLED);
1060 /* fall through */
1061 case NL80211_IFTYPE_ADHOC:
1062 case NL80211_IFTYPE_AP:
1063 case NL80211_IFTYPE_MESH_POINT:
1064 ieee80211_bss_info_change_notify(sdata, changed);
1065 break;
1066 case NL80211_IFTYPE_WDS:
1067 break;
1068 case NL80211_IFTYPE_AP_VLAN:
1069 case NL80211_IFTYPE_MONITOR:
1070 /* ignore virtual */
1071 break;
1072 case NL80211_IFTYPE_UNSPECIFIED:
1073 case __NL80211_IFTYPE_AFTER_LAST:
1074 WARN_ON(1);
1075 break;
1076 }
1077 }
1078
1079 /* add back keys */
1080 list_for_each_entry(sdata, &local->interfaces, list)
1081 if (netif_running(sdata->dev))
1082 ieee80211_enable_keys(sdata);
1083
1084 ieee80211_wake_queues_by_reason(hw,
1085 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1086
1087 /*
1088 * If this is for hw restart things are still running.
1089 * We may want to change that later, however.
1090 */
1091 if (!from_suspend)
1092 return 0;
1093
1094 #ifdef CONFIG_PM
1095 local->suspended = false;
1096
1097 list_for_each_entry(sdata, &local->interfaces, list) {
1098 switch(sdata->vif.type) {
1099 case NL80211_IFTYPE_STATION:
1100 ieee80211_sta_restart(sdata);
1101 break;
1102 case NL80211_IFTYPE_ADHOC:
1103 ieee80211_ibss_restart(sdata);
1104 break;
1105 case NL80211_IFTYPE_MESH_POINT:
1106 ieee80211_mesh_restart(sdata);
1107 break;
1108 default:
1109 break;
1110 }
1111 }
1112
1113 add_timer(&local->sta_cleanup);
1114
1115 spin_lock_irqsave(&local->sta_lock, flags);
1116 list_for_each_entry(sta, &local->sta_list, list)
1117 mesh_plink_restart(sta);
1118 spin_unlock_irqrestore(&local->sta_lock, flags);
1119 #else
1120 WARN_ON(1);
1121 #endif
1122 return 0;
1123 }
connection oriented routing - ARCHIVE NO UPDATES HERE