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ocfs2: Make the left masklogs compat.
[taoma-kernel.git] / net / mac80211 / util.c
blobd036597aabbed9e7658f6ff26b3ee8afbdf9e532
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 if (test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))
288 continue;
289 netif_wake_subqueue(sdata->dev, queue);
290 }
291 rcu_read_unlock();
292 } else
293 tasklet_schedule(&local->tx_pending_tasklet);
294 }
295
296 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
297 enum queue_stop_reason reason)
298 {
299 struct ieee80211_local *local = hw_to_local(hw);
300 unsigned long flags;
301
302 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
303 __ieee80211_wake_queue(hw, queue, reason);
304 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
305 }
306
307 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
308 {
309 ieee80211_wake_queue_by_reason(hw, queue,
310 IEEE80211_QUEUE_STOP_REASON_DRIVER);
311 }
312 EXPORT_SYMBOL(ieee80211_wake_queue);
313
314 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
315 enum queue_stop_reason reason)
316 {
317 struct ieee80211_local *local = hw_to_local(hw);
318 struct ieee80211_sub_if_data *sdata;
319
320 trace_stop_queue(local, queue, reason);
321
322 if (WARN_ON(queue >= hw->queues))
323 return;
324
325 __set_bit(reason, &local->queue_stop_reasons[queue]);
326
327 rcu_read_lock();
328 list_for_each_entry_rcu(sdata, &local->interfaces, list)
329 netif_stop_subqueue(sdata->dev, queue);
330 rcu_read_unlock();
331 }
332
333 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
334 enum queue_stop_reason reason)
335 {
336 struct ieee80211_local *local = hw_to_local(hw);
337 unsigned long flags;
338
339 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
340 __ieee80211_stop_queue(hw, queue, reason);
341 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
342 }
343
344 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
345 {
346 ieee80211_stop_queue_by_reason(hw, queue,
347 IEEE80211_QUEUE_STOP_REASON_DRIVER);
348 }
349 EXPORT_SYMBOL(ieee80211_stop_queue);
350
351 void ieee80211_add_pending_skb(struct ieee80211_local *local,
352 struct sk_buff *skb)
353 {
354 struct ieee80211_hw *hw = &local->hw;
355 unsigned long flags;
356 int queue = skb_get_queue_mapping(skb);
357 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
358
359 if (WARN_ON(!info->control.vif)) {
360 kfree_skb(skb);
361 return;
362 }
363
364 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
365 __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
366 __skb_queue_tail(&local->pending[queue], skb);
367 __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
368 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
369 }
370
371 int ieee80211_add_pending_skbs_fn(struct ieee80211_local *local,
372 struct sk_buff_head *skbs,
373 void (*fn)(void *data), void *data)
374 {
375 struct ieee80211_hw *hw = &local->hw;
376 struct sk_buff *skb;
377 unsigned long flags;
378 int queue, ret = 0, i;
379
380 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
381 for (i = 0; i < hw->queues; i++)
382 __ieee80211_stop_queue(hw, i,
383 IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
384
385 while ((skb = skb_dequeue(skbs))) {
386 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
387
388 if (WARN_ON(!info->control.vif)) {
389 kfree_skb(skb);
390 continue;
391 }
392
393 ret++;
394 queue = skb_get_queue_mapping(skb);
395 __skb_queue_tail(&local->pending[queue], skb);
396 }
397
398 if (fn)
399 fn(data);
400
401 for (i = 0; i < hw->queues; i++)
402 __ieee80211_wake_queue(hw, i,
403 IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
404 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
405
406 return ret;
407 }
408
409 int ieee80211_add_pending_skbs(struct ieee80211_local *local,
410 struct sk_buff_head *skbs)
411 {
412 return ieee80211_add_pending_skbs_fn(local, skbs, NULL, NULL);
413 }
414
415 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
416 enum queue_stop_reason reason)
417 {
418 struct ieee80211_local *local = hw_to_local(hw);
419 unsigned long flags;
420 int i;
421
422 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
423
424 for (i = 0; i < hw->queues; i++)
425 __ieee80211_stop_queue(hw, i, reason);
426
427 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
428 }
429
430 void ieee80211_stop_queues(struct ieee80211_hw *hw)
431 {
432 ieee80211_stop_queues_by_reason(hw,
433 IEEE80211_QUEUE_STOP_REASON_DRIVER);
434 }
435 EXPORT_SYMBOL(ieee80211_stop_queues);
436
437 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
438 {
439 struct ieee80211_local *local = hw_to_local(hw);
440 unsigned long flags;
441 int ret;
442
443 if (WARN_ON(queue >= hw->queues))
444 return true;
445
446 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
447 ret = !!local->queue_stop_reasons[queue];
448 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
449 return ret;
450 }
451 EXPORT_SYMBOL(ieee80211_queue_stopped);
452
453 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
454 enum queue_stop_reason reason)
455 {
456 struct ieee80211_local *local = hw_to_local(hw);
457 unsigned long flags;
458 int i;
459
460 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
461
462 for (i = 0; i < hw->queues; i++)
463 __ieee80211_wake_queue(hw, i, reason);
464
465 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
466 }
467
468 void ieee80211_wake_queues(struct ieee80211_hw *hw)
469 {
470 ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
471 }
472 EXPORT_SYMBOL(ieee80211_wake_queues);
473
474 void ieee80211_iterate_active_interfaces(
475 struct ieee80211_hw *hw,
476 void (*iterator)(void *data, u8 *mac,
477 struct ieee80211_vif *vif),
478 void *data)
479 {
480 struct ieee80211_local *local = hw_to_local(hw);
481 struct ieee80211_sub_if_data *sdata;
482
483 mutex_lock(&local->iflist_mtx);
484
485 list_for_each_entry(sdata, &local->interfaces, list) {
486 switch (sdata->vif.type) {
487 case NL80211_IFTYPE_MONITOR:
488 case NL80211_IFTYPE_AP_VLAN:
489 continue;
490 default:
491 break;
492 }
493 if (ieee80211_sdata_running(sdata))
494 iterator(data, sdata->vif.addr,
495 &sdata->vif);
496 }
497
498 mutex_unlock(&local->iflist_mtx);
499 }
500 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
501
502 void ieee80211_iterate_active_interfaces_atomic(
503 struct ieee80211_hw *hw,
504 void (*iterator)(void *data, u8 *mac,
505 struct ieee80211_vif *vif),
506 void *data)
507 {
508 struct ieee80211_local *local = hw_to_local(hw);
509 struct ieee80211_sub_if_data *sdata;
510
511 rcu_read_lock();
512
513 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
514 switch (sdata->vif.type) {
515 case NL80211_IFTYPE_MONITOR:
516 case NL80211_IFTYPE_AP_VLAN:
517 continue;
518 default:
519 break;
520 }
521 if (ieee80211_sdata_running(sdata))
522 iterator(data, sdata->vif.addr,
523 &sdata->vif);
524 }
525
526 rcu_read_unlock();
527 }
528 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
529
530 /*
531 * Nothing should have been stuffed into the workqueue during
532 * the suspend->resume cycle. If this WARN is seen then there
533 * is a bug with either the driver suspend or something in
534 * mac80211 stuffing into the workqueue which we haven't yet
535 * cleared during mac80211's suspend cycle.
536 */
537 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
538 {
539 if (WARN(local->suspended && !local->resuming,
540 "queueing ieee80211 work while going to suspend\n"))
541 return false;
542
543 return true;
544 }
545
546 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
547 {
548 struct ieee80211_local *local = hw_to_local(hw);
549
550 if (!ieee80211_can_queue_work(local))
551 return;
552
553 queue_work(local->workqueue, work);
554 }
555 EXPORT_SYMBOL(ieee80211_queue_work);
556
557 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
558 struct delayed_work *dwork,
559 unsigned long delay)
560 {
561 struct ieee80211_local *local = hw_to_local(hw);
562
563 if (!ieee80211_can_queue_work(local))
564 return;
565
566 queue_delayed_work(local->workqueue, dwork, delay);
567 }
568 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
569
570 void ieee802_11_parse_elems(u8 *start, size_t len,
571 struct ieee802_11_elems *elems)
572 {
573 ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
574 }
575
576 u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
577 struct ieee802_11_elems *elems,
578 u64 filter, u32 crc)
579 {
580 size_t left = len;
581 u8 *pos = start;
582 bool calc_crc = filter != 0;
583
584 memset(elems, 0, sizeof(*elems));
585 elems->ie_start = start;
586 elems->total_len = len;
587
588 while (left >= 2) {
589 u8 id, elen;
590
591 id = *pos++;
592 elen = *pos++;
593 left -= 2;
594
595 if (elen > left)
596 break;
597
598 if (calc_crc && id < 64 && (filter & (1ULL << id)))
599 crc = crc32_be(crc, pos - 2, elen + 2);
600
601 switch (id) {
602 case WLAN_EID_SSID:
603 elems->ssid = pos;
604 elems->ssid_len = elen;
605 break;
606 case WLAN_EID_SUPP_RATES:
607 elems->supp_rates = pos;
608 elems->supp_rates_len = elen;
609 break;
610 case WLAN_EID_FH_PARAMS:
611 elems->fh_params = pos;
612 elems->fh_params_len = elen;
613 break;
614 case WLAN_EID_DS_PARAMS:
615 elems->ds_params = pos;
616 elems->ds_params_len = elen;
617 break;
618 case WLAN_EID_CF_PARAMS:
619 elems->cf_params = pos;
620 elems->cf_params_len = elen;
621 break;
622 case WLAN_EID_TIM:
623 if (elen >= sizeof(struct ieee80211_tim_ie)) {
624 elems->tim = (void *)pos;
625 elems->tim_len = elen;
626 }
627 break;
628 case WLAN_EID_IBSS_PARAMS:
629 elems->ibss_params = pos;
630 elems->ibss_params_len = elen;
631 break;
632 case WLAN_EID_CHALLENGE:
633 elems->challenge = pos;
634 elems->challenge_len = elen;
635 break;
636 case WLAN_EID_VENDOR_SPECIFIC:
637 if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
638 pos[2] == 0xf2) {
639 /* Microsoft OUI (00:50:F2) */
640
641 if (calc_crc)
642 crc = crc32_be(crc, pos - 2, elen + 2);
643
644 if (pos[3] == 1) {
645 /* OUI Type 1 - WPA IE */
646 elems->wpa = pos;
647 elems->wpa_len = elen;
648 } else if (elen >= 5 && pos[3] == 2) {
649 /* OUI Type 2 - WMM IE */
650 if (pos[4] == 0) {
651 elems->wmm_info = pos;
652 elems->wmm_info_len = elen;
653 } else if (pos[4] == 1) {
654 elems->wmm_param = pos;
655 elems->wmm_param_len = elen;
656 }
657 }
658 }
659 break;
660 case WLAN_EID_RSN:
661 elems->rsn = pos;
662 elems->rsn_len = elen;
663 break;
664 case WLAN_EID_ERP_INFO:
665 elems->erp_info = pos;
666 elems->erp_info_len = elen;
667 break;
668 case WLAN_EID_EXT_SUPP_RATES:
669 elems->ext_supp_rates = pos;
670 elems->ext_supp_rates_len = elen;
671 break;
672 case WLAN_EID_HT_CAPABILITY:
673 if (elen >= sizeof(struct ieee80211_ht_cap))
674 elems->ht_cap_elem = (void *)pos;
675 break;
676 case WLAN_EID_HT_INFORMATION:
677 if (elen >= sizeof(struct ieee80211_ht_info))
678 elems->ht_info_elem = (void *)pos;
679 break;
680 case WLAN_EID_MESH_ID:
681 elems->mesh_id = pos;
682 elems->mesh_id_len = elen;
683 break;
684 case WLAN_EID_MESH_CONFIG:
685 if (elen >= sizeof(struct ieee80211_meshconf_ie))
686 elems->mesh_config = (void *)pos;
687 break;
688 case WLAN_EID_PEER_LINK:
689 elems->peer_link = pos;
690 elems->peer_link_len = elen;
691 break;
692 case WLAN_EID_PREQ:
693 elems->preq = pos;
694 elems->preq_len = elen;
695 break;
696 case WLAN_EID_PREP:
697 elems->prep = pos;
698 elems->prep_len = elen;
699 break;
700 case WLAN_EID_PERR:
701 elems->perr = pos;
702 elems->perr_len = elen;
703 break;
704 case WLAN_EID_RANN:
705 if (elen >= sizeof(struct ieee80211_rann_ie))
706 elems->rann = (void *)pos;
707 break;
708 case WLAN_EID_CHANNEL_SWITCH:
709 elems->ch_switch_elem = pos;
710 elems->ch_switch_elem_len = elen;
711 break;
712 case WLAN_EID_QUIET:
713 if (!elems->quiet_elem) {
714 elems->quiet_elem = pos;
715 elems->quiet_elem_len = elen;
716 }
717 elems->num_of_quiet_elem++;
718 break;
719 case WLAN_EID_COUNTRY:
720 elems->country_elem = pos;
721 elems->country_elem_len = elen;
722 break;
723 case WLAN_EID_PWR_CONSTRAINT:
724 elems->pwr_constr_elem = pos;
725 elems->pwr_constr_elem_len = elen;
726 break;
727 case WLAN_EID_TIMEOUT_INTERVAL:
728 elems->timeout_int = pos;
729 elems->timeout_int_len = elen;
730 break;
731 default:
732 break;
733 }
734
735 left -= elen;
736 pos += elen;
737 }
738
739 return crc;
740 }
741
742 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata)
743 {
744 struct ieee80211_local *local = sdata->local;
745 struct ieee80211_tx_queue_params qparam;
746 int queue;
747 bool use_11b;
748 int aCWmin, aCWmax;
749
750 if (!local->ops->conf_tx)
751 return;
752
753 memset(&qparam, 0, sizeof(qparam));
754
755 use_11b = (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) &&
756 !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
757
758 for (queue = 0; queue < local_to_hw(local)->queues; queue++) {
759 /* Set defaults according to 802.11-2007 Table 7-37 */
760 aCWmax = 1023;
761 if (use_11b)
762 aCWmin = 31;
763 else
764 aCWmin = 15;
765
766 switch (queue) {
767 case 3: /* AC_BK */
768 qparam.cw_max = aCWmax;
769 qparam.cw_min = aCWmin;
770 qparam.txop = 0;
771 qparam.aifs = 7;
772 break;
773 default: /* never happens but let's not leave undefined */
774 case 2: /* AC_BE */
775 qparam.cw_max = aCWmax;
776 qparam.cw_min = aCWmin;
777 qparam.txop = 0;
778 qparam.aifs = 3;
779 break;
780 case 1: /* AC_VI */
781 qparam.cw_max = aCWmin;
782 qparam.cw_min = (aCWmin + 1) / 2 - 1;
783 if (use_11b)
784 qparam.txop = 6016/32;
785 else
786 qparam.txop = 3008/32;
787 qparam.aifs = 2;
788 break;
789 case 0: /* AC_VO */
790 qparam.cw_max = (aCWmin + 1) / 2 - 1;
791 qparam.cw_min = (aCWmin + 1) / 4 - 1;
792 if (use_11b)
793 qparam.txop = 3264/32;
794 else
795 qparam.txop = 1504/32;
796 qparam.aifs = 2;
797 break;
798 }
799
800 qparam.uapsd = false;
801
802 drv_conf_tx(local, queue, &qparam);
803 }
804
805 /* after reinitialize QoS TX queues setting to default,
806 * disable QoS at all */
807
808 if (sdata->vif.type != NL80211_IFTYPE_MONITOR) {
809 sdata->vif.bss_conf.qos =
810 sdata->vif.type != NL80211_IFTYPE_STATION;
811 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
812 }
813 }
814
815 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
816 const size_t supp_rates_len,
817 const u8 *supp_rates)
818 {
819 struct ieee80211_local *local = sdata->local;
820 int i, have_higher_than_11mbit = 0;
821
822 /* cf. IEEE 802.11 9.2.12 */
823 for (i = 0; i < supp_rates_len; i++)
824 if ((supp_rates[i] & 0x7f) * 5 > 110)
825 have_higher_than_11mbit = 1;
826
827 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
828 have_higher_than_11mbit)
829 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
830 else
831 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
832
833 ieee80211_set_wmm_default(sdata);
834 }
835
836 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
837 enum ieee80211_band band)
838 {
839 struct ieee80211_supported_band *sband;
840 struct ieee80211_rate *bitrates;
841 u32 mandatory_rates;
842 enum ieee80211_rate_flags mandatory_flag;
843 int i;
844
845 sband = local->hw.wiphy->bands[band];
846 if (!sband) {
847 WARN_ON(1);
848 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
849 }
850
851 if (band == IEEE80211_BAND_2GHZ)
852 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
853 else
854 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
855
856 bitrates = sband->bitrates;
857 mandatory_rates = 0;
858 for (i = 0; i < sband->n_bitrates; i++)
859 if (bitrates[i].flags & mandatory_flag)
860 mandatory_rates |= BIT(i);
861 return mandatory_rates;
862 }
863
864 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
865 u16 transaction, u16 auth_alg,
866 u8 *extra, size_t extra_len, const u8 *bssid,
867 const u8 *key, u8 key_len, u8 key_idx)
868 {
869 struct ieee80211_local *local = sdata->local;
870 struct sk_buff *skb;
871 struct ieee80211_mgmt *mgmt;
872 int err;
873
874 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
875 sizeof(*mgmt) + 6 + extra_len);
876 if (!skb) {
877 printk(KERN_DEBUG "%s: failed to allocate buffer for auth "
878 "frame\n", sdata->name);
879 return;
880 }
881 skb_reserve(skb, local->hw.extra_tx_headroom);
882
883 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
884 memset(mgmt, 0, 24 + 6);
885 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
886 IEEE80211_STYPE_AUTH);
887 memcpy(mgmt->da, bssid, ETH_ALEN);
888 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
889 memcpy(mgmt->bssid, bssid, ETH_ALEN);
890 mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
891 mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
892 mgmt->u.auth.status_code = cpu_to_le16(0);
893 if (extra)
894 memcpy(skb_put(skb, extra_len), extra, extra_len);
895
896 if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
897 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
898 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
899 WARN_ON(err);
900 }
901
902 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
903 ieee80211_tx_skb(sdata, skb);
904 }
905
906 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
907 const u8 *ie, size_t ie_len,
908 enum ieee80211_band band, u32 rate_mask,
909 u8 channel)
910 {
911 struct ieee80211_supported_band *sband;
912 u8 *pos;
913 size_t offset = 0, noffset;
914 int supp_rates_len, i;
915 u8 rates[32];
916 int num_rates;
917 int ext_rates_len;
918
919 sband = local->hw.wiphy->bands[band];
920
921 pos = buffer;
922
923 num_rates = 0;
924 for (i = 0; i < sband->n_bitrates; i++) {
925 if ((BIT(i) & rate_mask) == 0)
926 continue; /* skip rate */
927 rates[num_rates++] = (u8) (sband->bitrates[i].bitrate / 5);
928 }
929
930 supp_rates_len = min_t(int, num_rates, 8);
931
932 *pos++ = WLAN_EID_SUPP_RATES;
933 *pos++ = supp_rates_len;
934 memcpy(pos, rates, supp_rates_len);
935 pos += supp_rates_len;
936
937 /* insert "request information" if in custom IEs */
938 if (ie && ie_len) {
939 static const u8 before_extrates[] = {
940 WLAN_EID_SSID,
941 WLAN_EID_SUPP_RATES,
942 WLAN_EID_REQUEST,
943 };
944 noffset = ieee80211_ie_split(ie, ie_len,
945 before_extrates,
946 ARRAY_SIZE(before_extrates),
947 offset);
948 memcpy(pos, ie + offset, noffset - offset);
949 pos += noffset - offset;
950 offset = noffset;
951 }
952
953 ext_rates_len = num_rates - supp_rates_len;
954 if (ext_rates_len > 0) {
955 *pos++ = WLAN_EID_EXT_SUPP_RATES;
956 *pos++ = ext_rates_len;
957 memcpy(pos, rates + supp_rates_len, ext_rates_len);
958 pos += ext_rates_len;
959 }
960
961 if (channel && sband->band == IEEE80211_BAND_2GHZ) {
962 *pos++ = WLAN_EID_DS_PARAMS;
963 *pos++ = 1;
964 *pos++ = channel;
965 }
966
967 /* insert custom IEs that go before HT */
968 if (ie && ie_len) {
969 static const u8 before_ht[] = {
970 WLAN_EID_SSID,
971 WLAN_EID_SUPP_RATES,
972 WLAN_EID_REQUEST,
973 WLAN_EID_EXT_SUPP_RATES,
974 WLAN_EID_DS_PARAMS,
975 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
976 };
977 noffset = ieee80211_ie_split(ie, ie_len,
978 before_ht, ARRAY_SIZE(before_ht),
979 offset);
980 memcpy(pos, ie + offset, noffset - offset);
981 pos += noffset - offset;
982 offset = noffset;
983 }
984
985 if (sband->ht_cap.ht_supported) {
986 u16 cap = sband->ht_cap.cap;
987 __le16 tmp;
988
989 if (ieee80211_disable_40mhz_24ghz &&
990 sband->band == IEEE80211_BAND_2GHZ) {
991 cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40;
992 cap &= ~IEEE80211_HT_CAP_SGI_40;
993 }
994
995 *pos++ = WLAN_EID_HT_CAPABILITY;
996 *pos++ = sizeof(struct ieee80211_ht_cap);
997 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
998 tmp = cpu_to_le16(cap);
999 memcpy(pos, &tmp, sizeof(u16));
1000 pos += sizeof(u16);
1001 *pos++ = sband->ht_cap.ampdu_factor |
1002 (sband->ht_cap.ampdu_density <<
1003 IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
1004 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
1005 pos += sizeof(sband->ht_cap.mcs);
1006 pos += 2 + 4 + 1; /* ext info, BF cap, antsel */
1007 }
1008
1009 /*
1010 * If adding more here, adjust code in main.c
1011 * that calculates local->scan_ies_len.
1012 */
1013
1014 /* add any remaining custom IEs */
1015 if (ie && ie_len) {
1016 noffset = ie_len;
1017 memcpy(pos, ie + offset, noffset - offset);
1018 pos += noffset - offset;
1019 }
1020
1021 return pos - buffer;
1022 }
1023
1024 struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
1025 u8 *dst,
1026 const u8 *ssid, size_t ssid_len,
1027 const u8 *ie, size_t ie_len)
1028 {
1029 struct ieee80211_local *local = sdata->local;
1030 struct sk_buff *skb;
1031 struct ieee80211_mgmt *mgmt;
1032 size_t buf_len;
1033 u8 *buf;
1034 u8 chan;
1035
1036 /* FIXME: come up with a proper value */
1037 buf = kmalloc(200 + ie_len, GFP_KERNEL);
1038 if (!buf) {
1039 printk(KERN_DEBUG "%s: failed to allocate temporary IE "
1040 "buffer\n", sdata->name);
1041 return NULL;
1042 }
1043
1044 chan = ieee80211_frequency_to_channel(
1045 local->hw.conf.channel->center_freq);
1046
1047 buf_len = ieee80211_build_preq_ies(local, buf, ie, ie_len,
1048 local->hw.conf.channel->band,
1049 sdata->rc_rateidx_mask
1050 [local->hw.conf.channel->band],
1051 chan);
1052
1053 skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
1054 ssid, ssid_len,
1055 buf, buf_len);
1056
1057 if (dst) {
1058 mgmt = (struct ieee80211_mgmt *) skb->data;
1059 memcpy(mgmt->da, dst, ETH_ALEN);
1060 memcpy(mgmt->bssid, dst, ETH_ALEN);
1061 }
1062
1063 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1064 kfree(buf);
1065
1066 return skb;
1067 }
1068
1069 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1070 const u8 *ssid, size_t ssid_len,
1071 const u8 *ie, size_t ie_len)
1072 {
1073 struct sk_buff *skb;
1074
1075 skb = ieee80211_build_probe_req(sdata, dst, ssid, ssid_len, ie, ie_len);
1076 if (skb)
1077 ieee80211_tx_skb(sdata, skb);
1078 }
1079
1080 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
1081 struct ieee802_11_elems *elems,
1082 enum ieee80211_band band)
1083 {
1084 struct ieee80211_supported_band *sband;
1085 struct ieee80211_rate *bitrates;
1086 size_t num_rates;
1087 u32 supp_rates;
1088 int i, j;
1089 sband = local->hw.wiphy->bands[band];
1090
1091 if (!sband) {
1092 WARN_ON(1);
1093 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1094 }
1095
1096 bitrates = sband->bitrates;
1097 num_rates = sband->n_bitrates;
1098 supp_rates = 0;
1099 for (i = 0; i < elems->supp_rates_len +
1100 elems->ext_supp_rates_len; i++) {
1101 u8 rate = 0;
1102 int own_rate;
1103 if (i < elems->supp_rates_len)
1104 rate = elems->supp_rates[i];
1105 else if (elems->ext_supp_rates)
1106 rate = elems->ext_supp_rates
1107 [i - elems->supp_rates_len];
1108 own_rate = 5 * (rate & 0x7f);
1109 for (j = 0; j < num_rates; j++)
1110 if (bitrates[j].bitrate == own_rate)
1111 supp_rates |= BIT(j);
1112 }
1113 return supp_rates;
1114 }
1115
1116 void ieee80211_stop_device(struct ieee80211_local *local)
1117 {
1118 ieee80211_led_radio(local, false);
1119 ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
1120
1121 cancel_work_sync(&local->reconfig_filter);
1122
1123 flush_workqueue(local->workqueue);
1124 drv_stop(local);
1125 }
1126
1127 int ieee80211_reconfig(struct ieee80211_local *local)
1128 {
1129 struct ieee80211_hw *hw = &local->hw;
1130 struct ieee80211_sub_if_data *sdata;
1131 struct sta_info *sta;
1132 int res;
1133
1134 if (local->suspended)
1135 local->resuming = true;
1136
1137 /* restart hardware */
1138 if (local->open_count) {
1139 /*
1140 * Upon resume hardware can sometimes be goofy due to
1141 * various platform / driver / bus issues, so restarting
1142 * the device may at times not work immediately. Propagate
1143 * the error.
1144 */
1145 res = drv_start(local);
1146 if (res) {
1147 WARN(local->suspended, "Hardware became unavailable "
1148 "upon resume. This could be a software issue "
1149 "prior to suspend or a hardware issue.\n");
1150 return res;
1151 }
1152
1153 ieee80211_led_radio(local, true);
1154 ieee80211_mod_tpt_led_trig(local,
1155 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1156 }
1157
1158 /* add interfaces */
1159 list_for_each_entry(sdata, &local->interfaces, list) {
1160 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1161 sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1162 ieee80211_sdata_running(sdata))
1163 res = drv_add_interface(local, &sdata->vif);
1164 }
1165
1166 /* add STAs back */
1167 mutex_lock(&local->sta_mtx);
1168 list_for_each_entry(sta, &local->sta_list, list) {
1169 if (sta->uploaded) {
1170 sdata = sta->sdata;
1171 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1172 sdata = container_of(sdata->bss,
1173 struct ieee80211_sub_if_data,
1174 u.ap);
1175
1176 WARN_ON(drv_sta_add(local, sdata, &sta->sta));
1177 }
1178 }
1179 mutex_unlock(&local->sta_mtx);
1180
1181 /* setup fragmentation threshold */
1182 drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
1183
1184 /* setup RTS threshold */
1185 drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1186
1187 /* reconfigure hardware */
1188 ieee80211_hw_config(local, ~0);
1189
1190 ieee80211_configure_filter(local);
1191
1192 /* Finally also reconfigure all the BSS information */
1193 list_for_each_entry(sdata, &local->interfaces, list) {
1194 u32 changed;
1195
1196 if (!ieee80211_sdata_running(sdata))
1197 continue;
1198
1199 /* common change flags for all interface types */
1200 changed = BSS_CHANGED_ERP_CTS_PROT |
1201 BSS_CHANGED_ERP_PREAMBLE |
1202 BSS_CHANGED_ERP_SLOT |
1203 BSS_CHANGED_HT |
1204 BSS_CHANGED_BASIC_RATES |
1205 BSS_CHANGED_BEACON_INT |
1206 BSS_CHANGED_BSSID |
1207 BSS_CHANGED_CQM |
1208 BSS_CHANGED_QOS;
1209
1210 switch (sdata->vif.type) {
1211 case NL80211_IFTYPE_STATION:
1212 changed |= BSS_CHANGED_ASSOC;
1213 mutex_lock(&sdata->u.mgd.mtx);
1214 ieee80211_bss_info_change_notify(sdata, changed);
1215 mutex_unlock(&sdata->u.mgd.mtx);
1216 break;
1217 case NL80211_IFTYPE_ADHOC:
1218 changed |= BSS_CHANGED_IBSS;
1219 /* fall through */
1220 case NL80211_IFTYPE_AP:
1221 case NL80211_IFTYPE_MESH_POINT:
1222 changed |= BSS_CHANGED_BEACON |
1223 BSS_CHANGED_BEACON_ENABLED;
1224 ieee80211_bss_info_change_notify(sdata, changed);
1225 break;
1226 case NL80211_IFTYPE_WDS:
1227 break;
1228 case NL80211_IFTYPE_AP_VLAN:
1229 case NL80211_IFTYPE_MONITOR:
1230 /* ignore virtual */
1231 break;
1232 case NL80211_IFTYPE_UNSPECIFIED:
1233 case NUM_NL80211_IFTYPES:
1234 case NL80211_IFTYPE_P2P_CLIENT:
1235 case NL80211_IFTYPE_P2P_GO:
1236 WARN_ON(1);
1237 break;
1238 }
1239 }
1240
1241 /*
1242 * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
1243 * sessions can be established after a resume.
1244 *
1245 * Also tear down aggregation sessions since reconfiguring
1246 * them in a hardware restart scenario is not easily done
1247 * right now, and the hardware will have lost information
1248 * about the sessions, but we and the AP still think they
1249 * are active. This is really a workaround though.
1250 */
1251 if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1252 mutex_lock(&local->sta_mtx);
1253
1254 list_for_each_entry(sta, &local->sta_list, list) {
1255 ieee80211_sta_tear_down_BA_sessions(sta, true);
1256 clear_sta_flags(sta, WLAN_STA_BLOCK_BA);
1257 }
1258
1259 mutex_unlock(&local->sta_mtx);
1260 }
1261
1262 /* add back keys */
1263 list_for_each_entry(sdata, &local->interfaces, list)
1264 if (ieee80211_sdata_running(sdata))
1265 ieee80211_enable_keys(sdata);
1266
1267 ieee80211_wake_queues_by_reason(hw,
1268 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1269
1270 /*
1271 * If this is for hw restart things are still running.
1272 * We may want to change that later, however.
1273 */
1274 if (!local->suspended)
1275 return 0;
1276
1277 #ifdef CONFIG_PM
1278 /* first set suspended false, then resuming */
1279 local->suspended = false;
1280 mb();
1281 local->resuming = false;
1282
1283 list_for_each_entry(sdata, &local->interfaces, list) {
1284 switch(sdata->vif.type) {
1285 case NL80211_IFTYPE_STATION:
1286 ieee80211_sta_restart(sdata);
1287 break;
1288 case NL80211_IFTYPE_ADHOC:
1289 ieee80211_ibss_restart(sdata);
1290 break;
1291 case NL80211_IFTYPE_MESH_POINT:
1292 ieee80211_mesh_restart(sdata);
1293 break;
1294 default:
1295 break;
1296 }
1297 }
1298
1299 add_timer(&local->sta_cleanup);
1300
1301 mutex_lock(&local->sta_mtx);
1302 list_for_each_entry(sta, &local->sta_list, list)
1303 mesh_plink_restart(sta);
1304 mutex_unlock(&local->sta_mtx);
1305 #else
1306 WARN_ON(1);
1307 #endif
1308 return 0;
1309 }
1310
1311 static int check_mgd_smps(struct ieee80211_if_managed *ifmgd,
1312 enum ieee80211_smps_mode *smps_mode)
1313 {
1314 if (ifmgd->associated) {
1315 *smps_mode = ifmgd->ap_smps;
1316
1317 if (*smps_mode == IEEE80211_SMPS_AUTOMATIC) {
1318 if (ifmgd->powersave)
1319 *smps_mode = IEEE80211_SMPS_DYNAMIC;
1320 else
1321 *smps_mode = IEEE80211_SMPS_OFF;
1322 }
1323
1324 return 1;
1325 }
1326
1327 return 0;
1328 }
1329
1330 /* must hold iflist_mtx */
1331 void ieee80211_recalc_smps(struct ieee80211_local *local)
1332 {
1333 struct ieee80211_sub_if_data *sdata;
1334 enum ieee80211_smps_mode smps_mode = IEEE80211_SMPS_OFF;
1335 int count = 0;
1336
1337 lockdep_assert_held(&local->iflist_mtx);
1338
1339 /*
1340 * This function could be improved to handle multiple
1341 * interfaces better, but right now it makes any
1342 * non-station interfaces force SM PS to be turned
1343 * off. If there are multiple station interfaces it
1344 * could also use the best possible mode, e.g. if
1345 * one is in static and the other in dynamic then
1346 * dynamic is ok.
1347 */
1348
1349 list_for_each_entry(sdata, &local->interfaces, list) {
1350 if (!ieee80211_sdata_running(sdata))
1351 continue;
1352 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1353 goto set;
1354
1355 count += check_mgd_smps(&sdata->u.mgd, &smps_mode);
1356
1357 if (count > 1) {
1358 smps_mode = IEEE80211_SMPS_OFF;
1359 break;
1360 }
1361 }
1362
1363 if (smps_mode == local->smps_mode)
1364 return;
1365
1366 set:
1367 local->smps_mode = smps_mode;
1368 /* changed flag is auto-detected for this */
1369 ieee80211_hw_config(local, 0);
1370 }
1371
1372 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1373 {
1374 int i;
1375
1376 for (i = 0; i < n_ids; i++)
1377 if (ids[i] == id)
1378 return true;
1379 return false;
1380 }
1381
1382 /**
1383 * ieee80211_ie_split - split an IE buffer according to ordering
1384 *
1385 * @ies: the IE buffer
1386 * @ielen: the length of the IE buffer
1387 * @ids: an array with element IDs that are allowed before
1388 * the split
1389 * @n_ids: the size of the element ID array
1390 * @offset: offset where to start splitting in the buffer
1391 *
1392 * This function splits an IE buffer by updating the @offset
1393 * variable to point to the location where the buffer should be
1394 * split.
1395 *
1396 * It assumes that the given IE buffer is well-formed, this
1397 * has to be guaranteed by the caller!
1398 *
1399 * It also assumes that the IEs in the buffer are ordered
1400 * correctly, if not the result of using this function will not
1401 * be ordered correctly either, i.e. it does no reordering.
1402 *
1403 * The function returns the offset where the next part of the
1404 * buffer starts, which may be @ielen if the entire (remainder)
1405 * of the buffer should be used.
1406 */
1407 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1408 const u8 *ids, int n_ids, size_t offset)
1409 {
1410 size_t pos = offset;
1411
1412 while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1413 pos += 2 + ies[pos + 1];
1414
1415 return pos;
1416 }
1417
1418 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1419 {
1420 size_t pos = offset;
1421
1422 while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1423 pos += 2 + ies[pos + 1];
1424
1425 return pos;
1426 }
The kernel tree for Tao Ma.