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net: emphasize rtnl lock required in call_netdevice_notifiers
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / mac80211 / util.c
1 /*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 * utilities for mac80211
12 */
13
14 #include <net/mac80211.h>
15 #include <linux/netdevice.h>
16 #include <linux/types.h>
17 #include <linux/slab.h>
18 #include <linux/skbuff.h>
19 #include <linux/etherdevice.h>
20 #include <linux/if_arp.h>
21 #include <linux/bitmap.h>
22 #include <linux/crc32.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 "driver-ops.h"
29 #include "rate.h"
30 #include "mesh.h"
31 #include "wme.h"
32 #include "led.h"
33 #include "wep.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 struct ieee80211_sub_if_data *sdata;
272
273 trace_wake_queue(local, queue, reason);
274
275 if (WARN_ON(queue >= hw->queues))
276 return;
277
278 __clear_bit(reason, &local->queue_stop_reasons[queue]);
279
280 if (local->queue_stop_reasons[queue] != 0)
281 /* someone still has this queue stopped */
282 return;
283
284 if (skb_queue_empty(&local->pending[queue])) {
285 rcu_read_lock();
286 list_for_each_entry_rcu(sdata, &local->interfaces, list)
287 netif_tx_wake_queue(netdev_get_tx_queue(sdata->dev, queue));
288 rcu_read_unlock();
289 } else
290 tasklet_schedule(&local->tx_pending_tasklet);
291 }
292
293 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
294 enum queue_stop_reason reason)
295 {
296 struct ieee80211_local *local = hw_to_local(hw);
297 unsigned long flags;
298
299 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
300 __ieee80211_wake_queue(hw, queue, reason);
301 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
302 }
303
304 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
305 {
306 ieee80211_wake_queue_by_reason(hw, queue,
307 IEEE80211_QUEUE_STOP_REASON_DRIVER);
308 }
309 EXPORT_SYMBOL(ieee80211_wake_queue);
310
311 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
312 enum queue_stop_reason reason)
313 {
314 struct ieee80211_local *local = hw_to_local(hw);
315 struct ieee80211_sub_if_data *sdata;
316
317 trace_stop_queue(local, queue, reason);
318
319 if (WARN_ON(queue >= hw->queues))
320 return;
321
322 __set_bit(reason, &local->queue_stop_reasons[queue]);
323
324 rcu_read_lock();
325 list_for_each_entry_rcu(sdata, &local->interfaces, list)
326 netif_tx_stop_queue(netdev_get_tx_queue(sdata->dev, queue));
327 rcu_read_unlock();
328 }
329
330 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
331 enum queue_stop_reason reason)
332 {
333 struct ieee80211_local *local = hw_to_local(hw);
334 unsigned long flags;
335
336 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
337 __ieee80211_stop_queue(hw, queue, reason);
338 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
339 }
340
341 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
342 {
343 ieee80211_stop_queue_by_reason(hw, queue,
344 IEEE80211_QUEUE_STOP_REASON_DRIVER);
345 }
346 EXPORT_SYMBOL(ieee80211_stop_queue);
347
348 void ieee80211_add_pending_skb(struct ieee80211_local *local,
349 struct sk_buff *skb)
350 {
351 struct ieee80211_hw *hw = &local->hw;
352 unsigned long flags;
353 int queue = skb_get_queue_mapping(skb);
354 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
355
356 if (WARN_ON(!info->control.vif)) {
357 kfree_skb(skb);
358 return;
359 }
360
361 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
362 __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
363 __skb_queue_tail(&local->pending[queue], skb);
364 __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
365 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
366 }
367
368 int ieee80211_add_pending_skbs(struct ieee80211_local *local,
369 struct sk_buff_head *skbs)
370 {
371 struct ieee80211_hw *hw = &local->hw;
372 struct sk_buff *skb;
373 unsigned long flags;
374 int queue, ret = 0, i;
375
376 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
377 for (i = 0; i < hw->queues; i++)
378 __ieee80211_stop_queue(hw, i,
379 IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
380
381 while ((skb = skb_dequeue(skbs))) {
382 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
383
384 if (WARN_ON(!info->control.vif)) {
385 kfree_skb(skb);
386 continue;
387 }
388
389 ret++;
390 queue = skb_get_queue_mapping(skb);
391 __skb_queue_tail(&local->pending[queue], skb);
392 }
393
394 for (i = 0; i < hw->queues; i++)
395 __ieee80211_wake_queue(hw, i,
396 IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
397 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
398
399 return ret;
400 }
401
402 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
403 enum queue_stop_reason reason)
404 {
405 struct ieee80211_local *local = hw_to_local(hw);
406 unsigned long flags;
407 int i;
408
409 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
410
411 for (i = 0; i < hw->queues; i++)
412 __ieee80211_stop_queue(hw, i, reason);
413
414 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
415 }
416
417 void ieee80211_stop_queues(struct ieee80211_hw *hw)
418 {
419 ieee80211_stop_queues_by_reason(hw,
420 IEEE80211_QUEUE_STOP_REASON_DRIVER);
421 }
422 EXPORT_SYMBOL(ieee80211_stop_queues);
423
424 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
425 {
426 struct ieee80211_local *local = hw_to_local(hw);
427 unsigned long flags;
428 int ret;
429
430 if (WARN_ON(queue >= hw->queues))
431 return true;
432
433 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
434 ret = !!local->queue_stop_reasons[queue];
435 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
436 return ret;
437 }
438 EXPORT_SYMBOL(ieee80211_queue_stopped);
439
440 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
441 enum queue_stop_reason reason)
442 {
443 struct ieee80211_local *local = hw_to_local(hw);
444 unsigned long flags;
445 int i;
446
447 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
448
449 for (i = 0; i < hw->queues; i++)
450 __ieee80211_wake_queue(hw, i, reason);
451
452 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
453 }
454
455 void ieee80211_wake_queues(struct ieee80211_hw *hw)
456 {
457 ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
458 }
459 EXPORT_SYMBOL(ieee80211_wake_queues);
460
461 void ieee80211_iterate_active_interfaces(
462 struct ieee80211_hw *hw,
463 void (*iterator)(void *data, u8 *mac,
464 struct ieee80211_vif *vif),
465 void *data)
466 {
467 struct ieee80211_local *local = hw_to_local(hw);
468 struct ieee80211_sub_if_data *sdata;
469
470 mutex_lock(&local->iflist_mtx);
471
472 list_for_each_entry(sdata, &local->interfaces, list) {
473 switch (sdata->vif.type) {
474 case __NL80211_IFTYPE_AFTER_LAST:
475 case NL80211_IFTYPE_UNSPECIFIED:
476 case NL80211_IFTYPE_MONITOR:
477 case NL80211_IFTYPE_AP_VLAN:
478 continue;
479 case NL80211_IFTYPE_AP:
480 case NL80211_IFTYPE_STATION:
481 case NL80211_IFTYPE_ADHOC:
482 case NL80211_IFTYPE_WDS:
483 case NL80211_IFTYPE_MESH_POINT:
484 break;
485 }
486 if (ieee80211_sdata_running(sdata))
487 iterator(data, sdata->vif.addr,
488 &sdata->vif);
489 }
490
491 mutex_unlock(&local->iflist_mtx);
492 }
493 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
494
495 void ieee80211_iterate_active_interfaces_atomic(
496 struct ieee80211_hw *hw,
497 void (*iterator)(void *data, u8 *mac,
498 struct ieee80211_vif *vif),
499 void *data)
500 {
501 struct ieee80211_local *local = hw_to_local(hw);
502 struct ieee80211_sub_if_data *sdata;
503
504 rcu_read_lock();
505
506 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
507 switch (sdata->vif.type) {
508 case __NL80211_IFTYPE_AFTER_LAST:
509 case NL80211_IFTYPE_UNSPECIFIED:
510 case NL80211_IFTYPE_MONITOR:
511 case NL80211_IFTYPE_AP_VLAN:
512 continue;
513 case NL80211_IFTYPE_AP:
514 case NL80211_IFTYPE_STATION:
515 case NL80211_IFTYPE_ADHOC:
516 case NL80211_IFTYPE_WDS:
517 case NL80211_IFTYPE_MESH_POINT:
518 break;
519 }
520 if (ieee80211_sdata_running(sdata))
521 iterator(data, sdata->vif.addr,
522 &sdata->vif);
523 }
524
525 rcu_read_unlock();
526 }
527 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
528
529 /*
530 * Nothing should have been stuffed into the workqueue during
531 * the suspend->resume cycle. If this WARN is seen then there
532 * is a bug with either the driver suspend or something in
533 * mac80211 stuffing into the workqueue which we haven't yet
534 * cleared during mac80211's suspend cycle.
535 */
536 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
537 {
538 if (WARN(local->suspended && !local->resuming,
539 "queueing ieee80211 work while going to suspend\n"))
540 return false;
541
542 return true;
543 }
544
545 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
546 {
547 struct ieee80211_local *local = hw_to_local(hw);
548
549 if (!ieee80211_can_queue_work(local))
550 return;
551
552 queue_work(local->workqueue, work);
553 }
554 EXPORT_SYMBOL(ieee80211_queue_work);
555
556 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
557 struct delayed_work *dwork,
558 unsigned long delay)
559 {
560 struct ieee80211_local *local = hw_to_local(hw);
561
562 if (!ieee80211_can_queue_work(local))
563 return;
564
565 queue_delayed_work(local->workqueue, dwork, delay);
566 }
567 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
568
569 void ieee802_11_parse_elems(u8 *start, size_t len,
570 struct ieee802_11_elems *elems)
571 {
572 ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
573 }
574
575 u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
576 struct ieee802_11_elems *elems,
577 u64 filter, u32 crc)
578 {
579 size_t left = len;
580 u8 *pos = start;
581 bool calc_crc = filter != 0;
582
583 memset(elems, 0, sizeof(*elems));
584 elems->ie_start = start;
585 elems->total_len = len;
586
587 while (left >= 2) {
588 u8 id, elen;
589
590 id = *pos++;
591 elen = *pos++;
592 left -= 2;
593
594 if (elen > left)
595 break;
596
597 if (calc_crc && id < 64 && (filter & (1ULL << id)))
598 crc = crc32_be(crc, pos - 2, elen + 2);
599
600 switch (id) {
601 case WLAN_EID_SSID:
602 elems->ssid = pos;
603 elems->ssid_len = elen;
604 break;
605 case WLAN_EID_SUPP_RATES:
606 elems->supp_rates = pos;
607 elems->supp_rates_len = elen;
608 break;
609 case WLAN_EID_FH_PARAMS:
610 elems->fh_params = pos;
611 elems->fh_params_len = elen;
612 break;
613 case WLAN_EID_DS_PARAMS:
614 elems->ds_params = pos;
615 elems->ds_params_len = elen;
616 break;
617 case WLAN_EID_CF_PARAMS:
618 elems->cf_params = pos;
619 elems->cf_params_len = elen;
620 break;
621 case WLAN_EID_TIM:
622 if (elen >= sizeof(struct ieee80211_tim_ie)) {
623 elems->tim = (void *)pos;
624 elems->tim_len = elen;
625 }
626 break;
627 case WLAN_EID_IBSS_PARAMS:
628 elems->ibss_params = pos;
629 elems->ibss_params_len = elen;
630 break;
631 case WLAN_EID_CHALLENGE:
632 elems->challenge = pos;
633 elems->challenge_len = elen;
634 break;
635 case WLAN_EID_VENDOR_SPECIFIC:
636 if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
637 pos[2] == 0xf2) {
638 /* Microsoft OUI (00:50:F2) */
639
640 if (calc_crc)
641 crc = crc32_be(crc, pos - 2, elen + 2);
642
643 if (pos[3] == 1) {
644 /* OUI Type 1 - WPA IE */
645 elems->wpa = pos;
646 elems->wpa_len = elen;
647 } else if (elen >= 5 && pos[3] == 2) {
648 /* OUI Type 2 - WMM IE */
649 if (pos[4] == 0) {
650 elems->wmm_info = pos;
651 elems->wmm_info_len = elen;
652 } else if (pos[4] == 1) {
653 elems->wmm_param = pos;
654 elems->wmm_param_len = elen;
655 }
656 }
657 }
658 break;
659 case WLAN_EID_RSN:
660 elems->rsn = pos;
661 elems->rsn_len = elen;
662 break;
663 case WLAN_EID_ERP_INFO:
664 elems->erp_info = pos;
665 elems->erp_info_len = elen;
666 break;
667 case WLAN_EID_EXT_SUPP_RATES:
668 elems->ext_supp_rates = pos;
669 elems->ext_supp_rates_len = elen;
670 break;
671 case WLAN_EID_HT_CAPABILITY:
672 if (elen >= sizeof(struct ieee80211_ht_cap))
673 elems->ht_cap_elem = (void *)pos;
674 break;
675 case WLAN_EID_HT_INFORMATION:
676 if (elen >= sizeof(struct ieee80211_ht_info))
677 elems->ht_info_elem = (void *)pos;
678 break;
679 case WLAN_EID_MESH_ID:
680 elems->mesh_id = pos;
681 elems->mesh_id_len = elen;
682 break;
683 case WLAN_EID_MESH_CONFIG:
684 if (elen >= sizeof(struct ieee80211_meshconf_ie))
685 elems->mesh_config = (void *)pos;
686 break;
687 case WLAN_EID_PEER_LINK:
688 elems->peer_link = pos;
689 elems->peer_link_len = elen;
690 break;
691 case WLAN_EID_PREQ:
692 elems->preq = pos;
693 elems->preq_len = elen;
694 break;
695 case WLAN_EID_PREP:
696 elems->prep = pos;
697 elems->prep_len = elen;
698 break;
699 case WLAN_EID_PERR:
700 elems->perr = pos;
701 elems->perr_len = elen;
702 break;
703 case WLAN_EID_RANN:
704 if (elen >= sizeof(struct ieee80211_rann_ie))
705 elems->rann = (void *)pos;
706 break;
707 case WLAN_EID_CHANNEL_SWITCH:
708 elems->ch_switch_elem = pos;
709 elems->ch_switch_elem_len = elen;
710 break;
711 case WLAN_EID_QUIET:
712 if (!elems->quiet_elem) {
713 elems->quiet_elem = pos;
714 elems->quiet_elem_len = elen;
715 }
716 elems->num_of_quiet_elem++;
717 break;
718 case WLAN_EID_COUNTRY:
719 elems->country_elem = pos;
720 elems->country_elem_len = elen;
721 break;
722 case WLAN_EID_PWR_CONSTRAINT:
723 elems->pwr_constr_elem = pos;
724 elems->pwr_constr_elem_len = elen;
725 break;
726 case WLAN_EID_TIMEOUT_INTERVAL:
727 elems->timeout_int = pos;
728 elems->timeout_int_len = elen;
729 break;
730 default:
731 break;
732 }
733
734 left -= elen;
735 pos += elen;
736 }
737
738 return crc;
739 }
740
741 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata)
742 {
743 struct ieee80211_local *local = sdata->local;
744 struct ieee80211_tx_queue_params qparam;
745 int queue;
746 bool use_11b;
747 int aCWmin, aCWmax;
748
749 if (!local->ops->conf_tx)
750 return;
751
752 memset(&qparam, 0, sizeof(qparam));
753
754 use_11b = (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) &&
755 !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
756
757 for (queue = 0; queue < local_to_hw(local)->queues; queue++) {
758 /* Set defaults according to 802.11-2007 Table 7-37 */
759 aCWmax = 1023;
760 if (use_11b)
761 aCWmin = 31;
762 else
763 aCWmin = 15;
764
765 switch (queue) {
766 case 3: /* AC_BK */
767 qparam.cw_max = aCWmax;
768 qparam.cw_min = aCWmin;
769 qparam.txop = 0;
770 qparam.aifs = 7;
771 break;
772 default: /* never happens but let's not leave undefined */
773 case 2: /* AC_BE */
774 qparam.cw_max = aCWmax;
775 qparam.cw_min = aCWmin;
776 qparam.txop = 0;
777 qparam.aifs = 3;
778 break;
779 case 1: /* AC_VI */
780 qparam.cw_max = aCWmin;
781 qparam.cw_min = (aCWmin + 1) / 2 - 1;
782 if (use_11b)
783 qparam.txop = 6016/32;
784 else
785 qparam.txop = 3008/32;
786 qparam.aifs = 2;
787 break;
788 case 0: /* AC_VO */
789 qparam.cw_max = (aCWmin + 1) / 2 - 1;
790 qparam.cw_min = (aCWmin + 1) / 4 - 1;
791 if (use_11b)
792 qparam.txop = 3264/32;
793 else
794 qparam.txop = 1504/32;
795 qparam.aifs = 2;
796 break;
797 }
798
799 qparam.uapsd = false;
800
801 drv_conf_tx(local, queue, &qparam);
802 }
803
804 /* after reinitialize QoS TX queues setting to default,
805 * disable QoS at all */
806 local->hw.conf.flags &= ~IEEE80211_CONF_QOS;
807 drv_config(local, IEEE80211_CONF_CHANGE_QOS);
808 }
809
810 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
811 const size_t supp_rates_len,
812 const u8 *supp_rates)
813 {
814 struct ieee80211_local *local = sdata->local;
815 int i, have_higher_than_11mbit = 0;
816
817 /* cf. IEEE 802.11 9.2.12 */
818 for (i = 0; i < supp_rates_len; i++)
819 if ((supp_rates[i] & 0x7f) * 5 > 110)
820 have_higher_than_11mbit = 1;
821
822 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
823 have_higher_than_11mbit)
824 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
825 else
826 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
827
828 ieee80211_set_wmm_default(sdata);
829 }
830
831 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
832 enum ieee80211_band band)
833 {
834 struct ieee80211_supported_band *sband;
835 struct ieee80211_rate *bitrates;
836 u32 mandatory_rates;
837 enum ieee80211_rate_flags mandatory_flag;
838 int i;
839
840 sband = local->hw.wiphy->bands[band];
841 if (!sband) {
842 WARN_ON(1);
843 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
844 }
845
846 if (band == IEEE80211_BAND_2GHZ)
847 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
848 else
849 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
850
851 bitrates = sband->bitrates;
852 mandatory_rates = 0;
853 for (i = 0; i < sband->n_bitrates; i++)
854 if (bitrates[i].flags & mandatory_flag)
855 mandatory_rates |= BIT(i);
856 return mandatory_rates;
857 }
858
859 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
860 u16 transaction, u16 auth_alg,
861 u8 *extra, size_t extra_len, const u8 *bssid,
862 const u8 *key, u8 key_len, u8 key_idx)
863 {
864 struct ieee80211_local *local = sdata->local;
865 struct sk_buff *skb;
866 struct ieee80211_mgmt *mgmt;
867 int err;
868
869 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
870 sizeof(*mgmt) + 6 + extra_len);
871 if (!skb) {
872 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
873 "frame\n", sdata->name);
874 return;
875 }
876 skb_reserve(skb, local->hw.extra_tx_headroom);
877
878 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
879 memset(mgmt, 0, 24 + 6);
880 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
881 IEEE80211_STYPE_AUTH);
882 memcpy(mgmt->da, bssid, ETH_ALEN);
883 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
884 memcpy(mgmt->bssid, bssid, ETH_ALEN);
885 mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
886 mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
887 mgmt->u.auth.status_code = cpu_to_le16(0);
888 if (extra)
889 memcpy(skb_put(skb, extra_len), extra, extra_len);
890
891 if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
892 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
893 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
894 WARN_ON(err);
895 }
896
897 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
898 ieee80211_tx_skb(sdata, skb);
899 }
900
901 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
902 const u8 *ie, size_t ie_len,
903 enum ieee80211_band band)
904 {
905 struct ieee80211_supported_band *sband;
906 u8 *pos;
907 size_t offset = 0, noffset;
908 int supp_rates_len, i;
909
910 sband = local->hw.wiphy->bands[band];
911
912 pos = buffer;
913
914 supp_rates_len = min_t(int, sband->n_bitrates, 8);
915
916 *pos++ = WLAN_EID_SUPP_RATES;
917 *pos++ = supp_rates_len;
918
919 for (i = 0; i < supp_rates_len; i++) {
920 int rate = sband->bitrates[i].bitrate;
921 *pos++ = (u8) (rate / 5);
922 }
923
924 /* insert "request information" if in custom IEs */
925 if (ie && ie_len) {
926 static const u8 before_extrates[] = {
927 WLAN_EID_SSID,
928 WLAN_EID_SUPP_RATES,
929 WLAN_EID_REQUEST,
930 };
931 noffset = ieee80211_ie_split(ie, ie_len,
932 before_extrates,
933 ARRAY_SIZE(before_extrates),
934 offset);
935 memcpy(pos, ie + offset, noffset - offset);
936 pos += noffset - offset;
937 offset = noffset;
938 }
939
940 if (sband->n_bitrates > i) {
941 *pos++ = WLAN_EID_EXT_SUPP_RATES;
942 *pos++ = sband->n_bitrates - i;
943
944 for (; i < sband->n_bitrates; i++) {
945 int rate = sband->bitrates[i].bitrate;
946 *pos++ = (u8) (rate / 5);
947 }
948 }
949
950 /* insert custom IEs that go before HT */
951 if (ie && ie_len) {
952 static const u8 before_ht[] = {
953 WLAN_EID_SSID,
954 WLAN_EID_SUPP_RATES,
955 WLAN_EID_REQUEST,
956 WLAN_EID_EXT_SUPP_RATES,
957 WLAN_EID_DS_PARAMS,
958 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
959 };
960 noffset = ieee80211_ie_split(ie, ie_len,
961 before_ht, ARRAY_SIZE(before_ht),
962 offset);
963 memcpy(pos, ie + offset, noffset - offset);
964 pos += noffset - offset;
965 offset = noffset;
966 }
967
968 if (sband->ht_cap.ht_supported) {
969 u16 cap = sband->ht_cap.cap;
970 __le16 tmp;
971
972 if (ieee80211_disable_40mhz_24ghz &&
973 sband->band == IEEE80211_BAND_2GHZ) {
974 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
975 cap &= ~IEEE80211_HT_CAP_SGI_40;
976 }
977
978 *pos++ = WLAN_EID_HT_CAPABILITY;
979 *pos++ = sizeof(struct ieee80211_ht_cap);
980 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
981 tmp = cpu_to_le16(cap);
982 memcpy(pos, &tmp, sizeof(u16));
983 pos += sizeof(u16);
984 *pos++ = sband->ht_cap.ampdu_factor |
985 (sband->ht_cap.ampdu_density <<
986 IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
987 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
988 pos += sizeof(sband->ht_cap.mcs);
989 pos += 2 + 4 + 1; /* ext info, BF cap, antsel */
990 }
991
992 /*
993 * If adding more here, adjust code in main.c
994 * that calculates local->scan_ies_len.
995 */
996
997 /* add any remaining custom IEs */
998 if (ie && ie_len) {
999 noffset = ie_len;
1000 memcpy(pos, ie + offset, noffset - offset);
1001 pos += noffset - offset;
1002 }
1003
1004 return pos - buffer;
1005 }
1006
1007 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1008 const u8 *ssid, size_t ssid_len,
1009 const u8 *ie, size_t ie_len)
1010 {
1011 struct ieee80211_local *local = sdata->local;
1012 struct sk_buff *skb;
1013 struct ieee80211_mgmt *mgmt;
1014 size_t buf_len;
1015 u8 *buf;
1016
1017 /* FIXME: come up with a proper value */
1018 buf = kmalloc(200 + ie_len, GFP_KERNEL);
1019 if (!buf) {
1020 printk(KERN_DEBUG "%s: failed to allocate temporary IE "
1021 "buffer\n", sdata->name);
1022 return;
1023 }
1024
1025 buf_len = ieee80211_build_preq_ies(local, buf, ie, ie_len,
1026 local->hw.conf.channel->band);
1027
1028 skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
1029 ssid, ssid_len,
1030 buf, buf_len);
1031
1032 if (dst) {
1033 mgmt = (struct ieee80211_mgmt *) skb->data;
1034 memcpy(mgmt->da, dst, ETH_ALEN);
1035 memcpy(mgmt->bssid, dst, ETH_ALEN);
1036 }
1037
1038 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1039 ieee80211_tx_skb(sdata, skb);
1040 kfree(buf);
1041 }
1042
1043 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
1044 struct ieee802_11_elems *elems,
1045 enum ieee80211_band band)
1046 {
1047 struct ieee80211_supported_band *sband;
1048 struct ieee80211_rate *bitrates;
1049 size_t num_rates;
1050 u32 supp_rates;
1051 int i, j;
1052 sband = local->hw.wiphy->bands[band];
1053
1054 if (!sband) {
1055 WARN_ON(1);
1056 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1057 }
1058
1059 bitrates = sband->bitrates;
1060 num_rates = sband->n_bitrates;
1061 supp_rates = 0;
1062 for (i = 0; i < elems->supp_rates_len +
1063 elems->ext_supp_rates_len; i++) {
1064 u8 rate = 0;
1065 int own_rate;
1066 if (i < elems->supp_rates_len)
1067 rate = elems->supp_rates[i];
1068 else if (elems->ext_supp_rates)
1069 rate = elems->ext_supp_rates
1070 [i - elems->supp_rates_len];
1071 own_rate = 5 * (rate & 0x7f);
1072 for (j = 0; j < num_rates; j++)
1073 if (bitrates[j].bitrate == own_rate)
1074 supp_rates |= BIT(j);
1075 }
1076 return supp_rates;
1077 }
1078
1079 void ieee80211_stop_device(struct ieee80211_local *local)
1080 {
1081 ieee80211_led_radio(local, false);
1082
1083 cancel_work_sync(&local->reconfig_filter);
1084
1085 flush_workqueue(local->workqueue);
1086 drv_stop(local);
1087 }
1088
1089 int ieee80211_reconfig(struct ieee80211_local *local)
1090 {
1091 struct ieee80211_hw *hw = &local->hw;
1092 struct ieee80211_sub_if_data *sdata;
1093 struct sta_info *sta;
1094 int res;
1095
1096 if (local->suspended)
1097 local->resuming = true;
1098
1099 /* restart hardware */
1100 if (local->open_count) {
1101 /*
1102 * Upon resume hardware can sometimes be goofy due to
1103 * various platform / driver / bus issues, so restarting
1104 * the device may at times not work immediately. Propagate
1105 * the error.
1106 */
1107 res = drv_start(local);
1108 if (res) {
1109 WARN(local->suspended, "Hardware became unavailable "
1110 "upon resume. This could be a software issue "
1111 "prior to suspend or a hardware issue.\n");
1112 return res;
1113 }
1114
1115 ieee80211_led_radio(local, true);
1116 }
1117
1118 /* add interfaces */
1119 list_for_each_entry(sdata, &local->interfaces, list) {
1120 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1121 sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1122 ieee80211_sdata_running(sdata))
1123 res = drv_add_interface(local, &sdata->vif);
1124 }
1125
1126 /* add STAs back */
1127 mutex_lock(&local->sta_mtx);
1128 list_for_each_entry(sta, &local->sta_list, list) {
1129 if (sta->uploaded) {
1130 sdata = sta->sdata;
1131 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1132 sdata = container_of(sdata->bss,
1133 struct ieee80211_sub_if_data,
1134 u.ap);
1135
1136 WARN_ON(drv_sta_add(local, sdata, &sta->sta));
1137 }
1138 }
1139 mutex_unlock(&local->sta_mtx);
1140
1141 /* Clear Suspend state so that ADDBA requests can be processed */
1142
1143 rcu_read_lock();
1144
1145 if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1146 list_for_each_entry_rcu(sta, &local->sta_list, list) {
1147 clear_sta_flags(sta, WLAN_STA_BLOCK_BA);
1148 }
1149 }
1150
1151 rcu_read_unlock();
1152
1153 /* setup RTS threshold */
1154 drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1155
1156 /* reconfigure hardware */
1157 ieee80211_hw_config(local, ~0);
1158
1159 ieee80211_configure_filter(local);
1160
1161 /* Finally also reconfigure all the BSS information */
1162 list_for_each_entry(sdata, &local->interfaces, list) {
1163 u32 changed = ~0;
1164 if (!ieee80211_sdata_running(sdata))
1165 continue;
1166 switch (sdata->vif.type) {
1167 case NL80211_IFTYPE_STATION:
1168 /* disable beacon change bits */
1169 changed &= ~(BSS_CHANGED_BEACON |
1170 BSS_CHANGED_BEACON_ENABLED);
1171 /* fall through */
1172 case NL80211_IFTYPE_ADHOC:
1173 case NL80211_IFTYPE_AP:
1174 case NL80211_IFTYPE_MESH_POINT:
1175 ieee80211_bss_info_change_notify(sdata, changed);
1176 break;
1177 case NL80211_IFTYPE_WDS:
1178 break;
1179 case NL80211_IFTYPE_AP_VLAN:
1180 case NL80211_IFTYPE_MONITOR:
1181 /* ignore virtual */
1182 break;
1183 case NL80211_IFTYPE_UNSPECIFIED:
1184 case __NL80211_IFTYPE_AFTER_LAST:
1185 WARN_ON(1);
1186 break;
1187 }
1188 }
1189
1190 rcu_read_lock();
1191 if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1192 list_for_each_entry_rcu(sta, &local->sta_list, list) {
1193 ieee80211_sta_tear_down_BA_sessions(sta);
1194 }
1195 }
1196 rcu_read_unlock();
1197
1198 /* add back keys */
1199 list_for_each_entry(sdata, &local->interfaces, list)
1200 if (ieee80211_sdata_running(sdata))
1201 ieee80211_enable_keys(sdata);
1202
1203 ieee80211_wake_queues_by_reason(hw,
1204 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1205
1206 /*
1207 * If this is for hw restart things are still running.
1208 * We may want to change that later, however.
1209 */
1210 if (!local->suspended)
1211 return 0;
1212
1213 #ifdef CONFIG_PM
1214 /* first set suspended false, then resuming */
1215 local->suspended = false;
1216 mb();
1217 local->resuming = false;
1218
1219 list_for_each_entry(sdata, &local->interfaces, list) {
1220 switch(sdata->vif.type) {
1221 case NL80211_IFTYPE_STATION:
1222 ieee80211_sta_restart(sdata);
1223 break;
1224 case NL80211_IFTYPE_ADHOC:
1225 ieee80211_ibss_restart(sdata);
1226 break;
1227 case NL80211_IFTYPE_MESH_POINT:
1228 ieee80211_mesh_restart(sdata);
1229 break;
1230 default:
1231 break;
1232 }
1233 }
1234
1235 add_timer(&local->sta_cleanup);
1236
1237 mutex_lock(&local->sta_mtx);
1238 list_for_each_entry(sta, &local->sta_list, list)
1239 mesh_plink_restart(sta);
1240 mutex_unlock(&local->sta_mtx);
1241 #else
1242 WARN_ON(1);
1243 #endif
1244 return 0;
1245 }
1246
1247 static int check_mgd_smps(struct ieee80211_if_managed *ifmgd,
1248 enum ieee80211_smps_mode *smps_mode)
1249 {
1250 if (ifmgd->associated) {
1251 *smps_mode = ifmgd->ap_smps;
1252
1253 if (*smps_mode == IEEE80211_SMPS_AUTOMATIC) {
1254 if (ifmgd->powersave)
1255 *smps_mode = IEEE80211_SMPS_DYNAMIC;
1256 else
1257 *smps_mode = IEEE80211_SMPS_OFF;
1258 }
1259
1260 return 1;
1261 }
1262
1263 return 0;
1264 }
1265
1266 /* must hold iflist_mtx */
1267 void ieee80211_recalc_smps(struct ieee80211_local *local,
1268 struct ieee80211_sub_if_data *forsdata)
1269 {
1270 struct ieee80211_sub_if_data *sdata;
1271 enum ieee80211_smps_mode smps_mode = IEEE80211_SMPS_OFF;
1272 int count = 0;
1273
1274 if (forsdata)
1275 WARN_ON(!mutex_is_locked(&forsdata->u.mgd.mtx));
1276
1277 WARN_ON(!mutex_is_locked(&local->iflist_mtx));
1278
1279 /*
1280 * This function could be improved to handle multiple
1281 * interfaces better, but right now it makes any
1282 * non-station interfaces force SM PS to be turned
1283 * off. If there are multiple station interfaces it
1284 * could also use the best possible mode, e.g. if
1285 * one is in static and the other in dynamic then
1286 * dynamic is ok.
1287 */
1288
1289 list_for_each_entry(sdata, &local->interfaces, list) {
1290 if (!netif_running(sdata->dev))
1291 continue;
1292 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1293 goto set;
1294 if (sdata != forsdata) {
1295 /*
1296 * This nested is ok -- we are holding the iflist_mtx
1297 * so can't get here twice or so. But it's required
1298 * since normally we acquire it first and then the
1299 * iflist_mtx.
1300 */
1301 mutex_lock_nested(&sdata->u.mgd.mtx, SINGLE_DEPTH_NESTING);
1302 count += check_mgd_smps(&sdata->u.mgd, &smps_mode);
1303 mutex_unlock(&sdata->u.mgd.mtx);
1304 } else
1305 count += check_mgd_smps(&sdata->u.mgd, &smps_mode);
1306
1307 if (count > 1) {
1308 smps_mode = IEEE80211_SMPS_OFF;
1309 break;
1310 }
1311 }
1312
1313 if (smps_mode == local->smps_mode)
1314 return;
1315
1316 set:
1317 local->smps_mode = smps_mode;
1318 /* changed flag is auto-detected for this */
1319 ieee80211_hw_config(local, 0);
1320 }
1321
1322 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1323 {
1324 int i;
1325
1326 for (i = 0; i < n_ids; i++)
1327 if (ids[i] == id)
1328 return true;
1329 return false;
1330 }
1331
1332 /**
1333 * ieee80211_ie_split - split an IE buffer according to ordering
1334 *
1335 * @ies: the IE buffer
1336 * @ielen: the length of the IE buffer
1337 * @ids: an array with element IDs that are allowed before
1338 * the split
1339 * @n_ids: the size of the element ID array
1340 * @offset: offset where to start splitting in the buffer
1341 *
1342 * This function splits an IE buffer by updating the @offset
1343 * variable to point to the location where the buffer should be
1344 * split.
1345 *
1346 * It assumes that the given IE buffer is well-formed, this
1347 * has to be guaranteed by the caller!
1348 *
1349 * It also assumes that the IEs in the buffer are ordered
1350 * correctly, if not the result of using this function will not
1351 * be ordered correctly either, i.e. it does no reordering.
1352 *
1353 * The function returns the offset where the next part of the
1354 * buffer starts, which may be @ielen if the entire (remainder)
1355 * of the buffer should be used.
1356 */
1357 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1358 const u8 *ids, int n_ids, size_t offset)
1359 {
1360 size_t pos = offset;
1361
1362 while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1363 pos += 2 + ies[pos + 1];
1364
1365 return pos;
1366 }
1367
1368 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1369 {
1370 size_t pos = offset;
1371
1372 while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1373 pos += 2 + ies[pos + 1];
1374
1375 return pos;
1376 }
kernel source for telekom puls (alcatel/mediatek)