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spi-topcliff-pch: Fix issue for transmitting over 4KByte
[zen-stable.git] / net / mac80211 / util.c
blob9919892575f45a94f55e34c474f3f93736755237
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/export.h>
17 #include <linux/types.h>
18 #include <linux/slab.h>
19 #include <linux/skbuff.h>
20 #include <linux/etherdevice.h>
21 #include <linux/if_arp.h>
22 #include <linux/bitmap.h>
23 #include <linux/crc32.h>
24 #include <net/net_namespace.h>
25 #include <net/cfg80211.h>
26 #include <net/rtnetlink.h>
27
28 #include "ieee80211_i.h"
29 #include "driver-ops.h"
30 #include "rate.h"
31 #include "mesh.h"
32 #include "wme.h"
33 #include "led.h"
34 #include "wep.h"
35
36 /* privid for wiphys to determine whether they belong to us or not */
37 void *mac80211_wiphy_privid = &mac80211_wiphy_privid;
38
39 struct ieee80211_hw *wiphy_to_ieee80211_hw(struct wiphy *wiphy)
40 {
41 struct ieee80211_local *local;
42 BUG_ON(!wiphy);
43
44 local = wiphy_priv(wiphy);
45 return &local->hw;
46 }
47 EXPORT_SYMBOL(wiphy_to_ieee80211_hw);
48
49 u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
50 enum nl80211_iftype type)
51 {
52 __le16 fc = hdr->frame_control;
53
54 /* drop ACK/CTS frames and incorrect hdr len (ctrl) */
55 if (len < 16)
56 return NULL;
57
58 if (ieee80211_is_data(fc)) {
59 if (len < 24) /* drop incorrect hdr len (data) */
60 return NULL;
61
62 if (ieee80211_has_a4(fc))
63 return NULL;
64 if (ieee80211_has_tods(fc))
65 return hdr->addr1;
66 if (ieee80211_has_fromds(fc))
67 return hdr->addr2;
68
69 return hdr->addr3;
70 }
71
72 if (ieee80211_is_mgmt(fc)) {
73 if (len < 24) /* drop incorrect hdr len (mgmt) */
74 return NULL;
75 return hdr->addr3;
76 }
77
78 if (ieee80211_is_ctl(fc)) {
79 if(ieee80211_is_pspoll(fc))
80 return hdr->addr1;
81
82 if (ieee80211_is_back_req(fc)) {
83 switch (type) {
84 case NL80211_IFTYPE_STATION:
85 return hdr->addr2;
86 case NL80211_IFTYPE_AP:
87 case NL80211_IFTYPE_AP_VLAN:
88 return hdr->addr1;
89 default:
90 break; /* fall through to the return */
91 }
92 }
93 }
94
95 return NULL;
96 }
97
98 void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
99 {
100 struct sk_buff *skb;
101 struct ieee80211_hdr *hdr;
102
103 skb_queue_walk(&tx->skbs, skb) {
104 hdr = (struct ieee80211_hdr *) skb->data;
105 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
106 }
107 }
108
109 int ieee80211_frame_duration(struct ieee80211_local *local, size_t len,
110 int rate, int erp, int short_preamble)
111 {
112 int dur;
113
114 /* calculate duration (in microseconds, rounded up to next higher
115 * integer if it includes a fractional microsecond) to send frame of
116 * len bytes (does not include FCS) at the given rate. Duration will
117 * also include SIFS.
118 *
119 * rate is in 100 kbps, so divident is multiplied by 10 in the
120 * DIV_ROUND_UP() operations.
121 */
122
123 if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ || erp) {
124 /*
125 * OFDM:
126 *
127 * N_DBPS = DATARATE x 4
128 * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
129 * (16 = SIGNAL time, 6 = tail bits)
130 * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
131 *
132 * T_SYM = 4 usec
133 * 802.11a - 17.5.2: aSIFSTime = 16 usec
134 * 802.11g - 19.8.4: aSIFSTime = 10 usec +
135 * signal ext = 6 usec
136 */
137 dur = 16; /* SIFS + signal ext */
138 dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */
139 dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */
140 dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
141 4 * rate); /* T_SYM x N_SYM */
142 } else {
143 /*
144 * 802.11b or 802.11g with 802.11b compatibility:
145 * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
146 * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
147 *
148 * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
149 * aSIFSTime = 10 usec
150 * aPreambleLength = 144 usec or 72 usec with short preamble
151 * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
152 */
153 dur = 10; /* aSIFSTime = 10 usec */
154 dur += short_preamble ? (72 + 24) : (144 + 48);
155
156 dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
157 }
158
159 return dur;
160 }
161
162 /* Exported duration function for driver use */
163 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
164 struct ieee80211_vif *vif,
165 size_t frame_len,
166 struct ieee80211_rate *rate)
167 {
168 struct ieee80211_local *local = hw_to_local(hw);
169 struct ieee80211_sub_if_data *sdata;
170 u16 dur;
171 int erp;
172 bool short_preamble = false;
173
174 erp = 0;
175 if (vif) {
176 sdata = vif_to_sdata(vif);
177 short_preamble = sdata->vif.bss_conf.use_short_preamble;
178 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
179 erp = rate->flags & IEEE80211_RATE_ERP_G;
180 }
181
182 dur = ieee80211_frame_duration(local, frame_len, rate->bitrate, erp,
183 short_preamble);
184
185 return cpu_to_le16(dur);
186 }
187 EXPORT_SYMBOL(ieee80211_generic_frame_duration);
188
189 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
190 struct ieee80211_vif *vif, size_t frame_len,
191 const struct ieee80211_tx_info *frame_txctl)
192 {
193 struct ieee80211_local *local = hw_to_local(hw);
194 struct ieee80211_rate *rate;
195 struct ieee80211_sub_if_data *sdata;
196 bool short_preamble;
197 int erp;
198 u16 dur;
199 struct ieee80211_supported_band *sband;
200
201 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
202
203 short_preamble = false;
204
205 rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
206
207 erp = 0;
208 if (vif) {
209 sdata = vif_to_sdata(vif);
210 short_preamble = sdata->vif.bss_conf.use_short_preamble;
211 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
212 erp = rate->flags & IEEE80211_RATE_ERP_G;
213 }
214
215 /* CTS duration */
216 dur = ieee80211_frame_duration(local, 10, rate->bitrate,
217 erp, short_preamble);
218 /* Data frame duration */
219 dur += ieee80211_frame_duration(local, frame_len, rate->bitrate,
220 erp, short_preamble);
221 /* ACK duration */
222 dur += ieee80211_frame_duration(local, 10, rate->bitrate,
223 erp, short_preamble);
224
225 return cpu_to_le16(dur);
226 }
227 EXPORT_SYMBOL(ieee80211_rts_duration);
228
229 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
230 struct ieee80211_vif *vif,
231 size_t frame_len,
232 const struct ieee80211_tx_info *frame_txctl)
233 {
234 struct ieee80211_local *local = hw_to_local(hw);
235 struct ieee80211_rate *rate;
236 struct ieee80211_sub_if_data *sdata;
237 bool short_preamble;
238 int erp;
239 u16 dur;
240 struct ieee80211_supported_band *sband;
241
242 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
243
244 short_preamble = false;
245
246 rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
247 erp = 0;
248 if (vif) {
249 sdata = vif_to_sdata(vif);
250 short_preamble = sdata->vif.bss_conf.use_short_preamble;
251 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
252 erp = rate->flags & IEEE80211_RATE_ERP_G;
253 }
254
255 /* Data frame duration */
256 dur = ieee80211_frame_duration(local, frame_len, rate->bitrate,
257 erp, short_preamble);
258 if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
259 /* ACK duration */
260 dur += ieee80211_frame_duration(local, 10, rate->bitrate,
261 erp, short_preamble);
262 }
263
264 return cpu_to_le16(dur);
265 }
266 EXPORT_SYMBOL(ieee80211_ctstoself_duration);
267
268 static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
269 enum queue_stop_reason reason)
270 {
271 struct ieee80211_local *local = hw_to_local(hw);
272 struct ieee80211_sub_if_data *sdata;
273
274 trace_wake_queue(local, queue, reason);
275
276 if (WARN_ON(queue >= hw->queues))
277 return;
278
279 __clear_bit(reason, &local->queue_stop_reasons[queue]);
280
281 if (local->queue_stop_reasons[queue] != 0)
282 /* someone still has this queue stopped */
283 return;
284
285 if (skb_queue_empty(&local->pending[queue])) {
286 rcu_read_lock();
287 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
288 if (test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))
289 continue;
290 netif_wake_subqueue(sdata->dev, queue);
291 }
292 rcu_read_unlock();
293 } else
294 tasklet_schedule(&local->tx_pending_tasklet);
295 }
296
297 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
298 enum queue_stop_reason reason)
299 {
300 struct ieee80211_local *local = hw_to_local(hw);
301 unsigned long flags;
302
303 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
304 __ieee80211_wake_queue(hw, queue, reason);
305 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
306 }
307
308 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
309 {
310 ieee80211_wake_queue_by_reason(hw, queue,
311 IEEE80211_QUEUE_STOP_REASON_DRIVER);
312 }
313 EXPORT_SYMBOL(ieee80211_wake_queue);
314
315 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
316 enum queue_stop_reason reason)
317 {
318 struct ieee80211_local *local = hw_to_local(hw);
319 struct ieee80211_sub_if_data *sdata;
320
321 trace_stop_queue(local, queue, reason);
322
323 if (WARN_ON(queue >= hw->queues))
324 return;
325
326 __set_bit(reason, &local->queue_stop_reasons[queue]);
327
328 rcu_read_lock();
329 list_for_each_entry_rcu(sdata, &local->interfaces, list)
330 netif_stop_subqueue(sdata->dev, queue);
331 rcu_read_unlock();
332 }
333
334 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
335 enum queue_stop_reason reason)
336 {
337 struct ieee80211_local *local = hw_to_local(hw);
338 unsigned long flags;
339
340 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
341 __ieee80211_stop_queue(hw, queue, reason);
342 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
343 }
344
345 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
346 {
347 ieee80211_stop_queue_by_reason(hw, queue,
348 IEEE80211_QUEUE_STOP_REASON_DRIVER);
349 }
350 EXPORT_SYMBOL(ieee80211_stop_queue);
351
352 void ieee80211_add_pending_skb(struct ieee80211_local *local,
353 struct sk_buff *skb)
354 {
355 struct ieee80211_hw *hw = &local->hw;
356 unsigned long flags;
357 int queue = skb_get_queue_mapping(skb);
358 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
359
360 if (WARN_ON(!info->control.vif)) {
361 kfree_skb(skb);
362 return;
363 }
364
365 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
366 __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
367 __skb_queue_tail(&local->pending[queue], skb);
368 __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
369 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
370 }
371
372 void ieee80211_add_pending_skbs_fn(struct ieee80211_local *local,
373 struct sk_buff_head *skbs,
374 void (*fn)(void *data), void *data)
375 {
376 struct ieee80211_hw *hw = &local->hw;
377 struct sk_buff *skb;
378 unsigned long flags;
379 int queue, i;
380
381 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
382 for (i = 0; i < hw->queues; i++)
383 __ieee80211_stop_queue(hw, i,
384 IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
385
386 while ((skb = skb_dequeue(skbs))) {
387 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
388
389 if (WARN_ON(!info->control.vif)) {
390 kfree_skb(skb);
391 continue;
392 }
393
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
407 void ieee80211_add_pending_skbs(struct ieee80211_local *local,
408 struct sk_buff_head *skbs)
409 {
410 ieee80211_add_pending_skbs_fn(local, skbs, NULL, NULL);
411 }
412
413 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
414 enum queue_stop_reason reason)
415 {
416 struct ieee80211_local *local = hw_to_local(hw);
417 unsigned long flags;
418 int i;
419
420 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
421
422 for (i = 0; i < hw->queues; i++)
423 __ieee80211_stop_queue(hw, i, reason);
424
425 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
426 }
427
428 void ieee80211_stop_queues(struct ieee80211_hw *hw)
429 {
430 ieee80211_stop_queues_by_reason(hw,
431 IEEE80211_QUEUE_STOP_REASON_DRIVER);
432 }
433 EXPORT_SYMBOL(ieee80211_stop_queues);
434
435 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
436 {
437 struct ieee80211_local *local = hw_to_local(hw);
438 unsigned long flags;
439 int ret;
440
441 if (WARN_ON(queue >= hw->queues))
442 return true;
443
444 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
445 ret = !!local->queue_stop_reasons[queue];
446 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
447 return ret;
448 }
449 EXPORT_SYMBOL(ieee80211_queue_stopped);
450
451 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
452 enum queue_stop_reason reason)
453 {
454 struct ieee80211_local *local = hw_to_local(hw);
455 unsigned long flags;
456 int i;
457
458 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
459
460 for (i = 0; i < hw->queues; i++)
461 __ieee80211_wake_queue(hw, i, reason);
462
463 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
464 }
465
466 void ieee80211_wake_queues(struct ieee80211_hw *hw)
467 {
468 ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
469 }
470 EXPORT_SYMBOL(ieee80211_wake_queues);
471
472 void ieee80211_iterate_active_interfaces(
473 struct ieee80211_hw *hw,
474 void (*iterator)(void *data, u8 *mac,
475 struct ieee80211_vif *vif),
476 void *data)
477 {
478 struct ieee80211_local *local = hw_to_local(hw);
479 struct ieee80211_sub_if_data *sdata;
480
481 mutex_lock(&local->iflist_mtx);
482
483 list_for_each_entry(sdata, &local->interfaces, list) {
484 switch (sdata->vif.type) {
485 case NL80211_IFTYPE_MONITOR:
486 case NL80211_IFTYPE_AP_VLAN:
487 continue;
488 default:
489 break;
490 }
491 if (ieee80211_sdata_running(sdata))
492 iterator(data, sdata->vif.addr,
493 &sdata->vif);
494 }
495
496 mutex_unlock(&local->iflist_mtx);
497 }
498 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
499
500 void ieee80211_iterate_active_interfaces_atomic(
501 struct ieee80211_hw *hw,
502 void (*iterator)(void *data, u8 *mac,
503 struct ieee80211_vif *vif),
504 void *data)
505 {
506 struct ieee80211_local *local = hw_to_local(hw);
507 struct ieee80211_sub_if_data *sdata;
508
509 rcu_read_lock();
510
511 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
512 switch (sdata->vif.type) {
513 case NL80211_IFTYPE_MONITOR:
514 case NL80211_IFTYPE_AP_VLAN:
515 continue;
516 default:
517 break;
518 }
519 if (ieee80211_sdata_running(sdata))
520 iterator(data, sdata->vif.addr,
521 &sdata->vif);
522 }
523
524 rcu_read_unlock();
525 }
526 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
527
528 /*
529 * Nothing should have been stuffed into the workqueue during
530 * the suspend->resume cycle. If this WARN is seen then there
531 * is a bug with either the driver suspend or something in
532 * mac80211 stuffing into the workqueue which we haven't yet
533 * cleared during mac80211's suspend cycle.
534 */
535 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
536 {
537 if (WARN(local->suspended && !local->resuming,
538 "queueing ieee80211 work while going to suspend\n"))
539 return false;
540
541 return true;
542 }
543
544 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
545 {
546 struct ieee80211_local *local = hw_to_local(hw);
547
548 if (!ieee80211_can_queue_work(local))
549 return;
550
551 queue_work(local->workqueue, work);
552 }
553 EXPORT_SYMBOL(ieee80211_queue_work);
554
555 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
556 struct delayed_work *dwork,
557 unsigned long delay)
558 {
559 struct ieee80211_local *local = hw_to_local(hw);
560
561 if (!ieee80211_can_queue_work(local))
562 return;
563
564 queue_delayed_work(local->workqueue, dwork, delay);
565 }
566 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
567
568 u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
569 struct ieee802_11_elems *elems,
570 u64 filter, u32 crc)
571 {
572 size_t left = len;
573 u8 *pos = start;
574 bool calc_crc = filter != 0;
575
576 memset(elems, 0, sizeof(*elems));
577 elems->ie_start = start;
578 elems->total_len = len;
579
580 while (left >= 2) {
581 u8 id, elen;
582
583 id = *pos++;
584 elen = *pos++;
585 left -= 2;
586
587 if (elen > left)
588 break;
589
590 if (calc_crc && id < 64 && (filter & (1ULL << id)))
591 crc = crc32_be(crc, pos - 2, elen + 2);
592
593 switch (id) {
594 case WLAN_EID_SSID:
595 elems->ssid = pos;
596 elems->ssid_len = elen;
597 break;
598 case WLAN_EID_SUPP_RATES:
599 elems->supp_rates = pos;
600 elems->supp_rates_len = elen;
601 break;
602 case WLAN_EID_FH_PARAMS:
603 elems->fh_params = pos;
604 elems->fh_params_len = elen;
605 break;
606 case WLAN_EID_DS_PARAMS:
607 elems->ds_params = pos;
608 elems->ds_params_len = elen;
609 break;
610 case WLAN_EID_CF_PARAMS:
611 elems->cf_params = pos;
612 elems->cf_params_len = elen;
613 break;
614 case WLAN_EID_TIM:
615 if (elen >= sizeof(struct ieee80211_tim_ie)) {
616 elems->tim = (void *)pos;
617 elems->tim_len = elen;
618 }
619 break;
620 case WLAN_EID_IBSS_PARAMS:
621 elems->ibss_params = pos;
622 elems->ibss_params_len = elen;
623 break;
624 case WLAN_EID_CHALLENGE:
625 elems->challenge = pos;
626 elems->challenge_len = elen;
627 break;
628 case WLAN_EID_VENDOR_SPECIFIC:
629 if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
630 pos[2] == 0xf2) {
631 /* Microsoft OUI (00:50:F2) */
632
633 if (calc_crc)
634 crc = crc32_be(crc, pos - 2, elen + 2);
635
636 if (pos[3] == 1) {
637 /* OUI Type 1 - WPA IE */
638 elems->wpa = pos;
639 elems->wpa_len = elen;
640 } else if (elen >= 5 && pos[3] == 2) {
641 /* OUI Type 2 - WMM IE */
642 if (pos[4] == 0) {
643 elems->wmm_info = pos;
644 elems->wmm_info_len = elen;
645 } else if (pos[4] == 1) {
646 elems->wmm_param = pos;
647 elems->wmm_param_len = elen;
648 }
649 }
650 }
651 break;
652 case WLAN_EID_RSN:
653 elems->rsn = pos;
654 elems->rsn_len = elen;
655 break;
656 case WLAN_EID_ERP_INFO:
657 elems->erp_info = pos;
658 elems->erp_info_len = elen;
659 break;
660 case WLAN_EID_EXT_SUPP_RATES:
661 elems->ext_supp_rates = pos;
662 elems->ext_supp_rates_len = elen;
663 break;
664 case WLAN_EID_HT_CAPABILITY:
665 if (elen >= sizeof(struct ieee80211_ht_cap))
666 elems->ht_cap_elem = (void *)pos;
667 break;
668 case WLAN_EID_HT_INFORMATION:
669 if (elen >= sizeof(struct ieee80211_ht_info))
670 elems->ht_info_elem = (void *)pos;
671 break;
672 case WLAN_EID_MESH_ID:
673 elems->mesh_id = pos;
674 elems->mesh_id_len = elen;
675 break;
676 case WLAN_EID_MESH_CONFIG:
677 if (elen >= sizeof(struct ieee80211_meshconf_ie))
678 elems->mesh_config = (void *)pos;
679 break;
680 case WLAN_EID_PEER_MGMT:
681 elems->peering = pos;
682 elems->peering_len = elen;
683 break;
684 case WLAN_EID_PREQ:
685 elems->preq = pos;
686 elems->preq_len = elen;
687 break;
688 case WLAN_EID_PREP:
689 elems->prep = pos;
690 elems->prep_len = elen;
691 break;
692 case WLAN_EID_PERR:
693 elems->perr = pos;
694 elems->perr_len = elen;
695 break;
696 case WLAN_EID_RANN:
697 if (elen >= sizeof(struct ieee80211_rann_ie))
698 elems->rann = (void *)pos;
699 break;
700 case WLAN_EID_CHANNEL_SWITCH:
701 elems->ch_switch_elem = pos;
702 elems->ch_switch_elem_len = elen;
703 break;
704 case WLAN_EID_QUIET:
705 if (!elems->quiet_elem) {
706 elems->quiet_elem = pos;
707 elems->quiet_elem_len = elen;
708 }
709 elems->num_of_quiet_elem++;
710 break;
711 case WLAN_EID_COUNTRY:
712 elems->country_elem = pos;
713 elems->country_elem_len = elen;
714 break;
715 case WLAN_EID_PWR_CONSTRAINT:
716 elems->pwr_constr_elem = pos;
717 elems->pwr_constr_elem_len = elen;
718 break;
719 case WLAN_EID_TIMEOUT_INTERVAL:
720 elems->timeout_int = pos;
721 elems->timeout_int_len = elen;
722 break;
723 default:
724 break;
725 }
726
727 left -= elen;
728 pos += elen;
729 }
730
731 return crc;
732 }
733
734 void ieee802_11_parse_elems(u8 *start, size_t len,
735 struct ieee802_11_elems *elems)
736 {
737 ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
738 }
739
740 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata)
741 {
742 struct ieee80211_local *local = sdata->local;
743 struct ieee80211_tx_queue_params qparam;
744 int queue;
745 bool use_11b;
746 int aCWmin, aCWmax;
747
748 if (!local->ops->conf_tx)
749 return;
750
751 memset(&qparam, 0, sizeof(qparam));
752
753 use_11b = (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) &&
754 !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
755
756 for (queue = 0; queue < local_to_hw(local)->queues; queue++) {
757 /* Set defaults according to 802.11-2007 Table 7-37 */
758 aCWmax = 1023;
759 if (use_11b)
760 aCWmin = 31;
761 else
762 aCWmin = 15;
763
764 switch (queue) {
765 case 3: /* AC_BK */
766 qparam.cw_max = aCWmax;
767 qparam.cw_min = aCWmin;
768 qparam.txop = 0;
769 qparam.aifs = 7;
770 break;
771 default: /* never happens but let's not leave undefined */
772 case 2: /* AC_BE */
773 qparam.cw_max = aCWmax;
774 qparam.cw_min = aCWmin;
775 qparam.txop = 0;
776 qparam.aifs = 3;
777 break;
778 case 1: /* AC_VI */
779 qparam.cw_max = aCWmin;
780 qparam.cw_min = (aCWmin + 1) / 2 - 1;
781 if (use_11b)
782 qparam.txop = 6016/32;
783 else
784 qparam.txop = 3008/32;
785 qparam.aifs = 2;
786 break;
787 case 0: /* AC_VO */
788 qparam.cw_max = (aCWmin + 1) / 2 - 1;
789 qparam.cw_min = (aCWmin + 1) / 4 - 1;
790 if (use_11b)
791 qparam.txop = 3264/32;
792 else
793 qparam.txop = 1504/32;
794 qparam.aifs = 2;
795 break;
796 }
797
798 qparam.uapsd = false;
799
800 sdata->tx_conf[queue] = qparam;
801 drv_conf_tx(local, sdata, queue, &qparam);
802 }
803
804 /* after reinitialize QoS TX queues setting to default,
805 * disable QoS at all */
806
807 if (sdata->vif.type != NL80211_IFTYPE_MONITOR) {
808 sdata->vif.bss_conf.qos =
809 sdata->vif.type != NL80211_IFTYPE_STATION;
810 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
811 }
812 }
813
814 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
815 const size_t supp_rates_len,
816 const u8 *supp_rates)
817 {
818 struct ieee80211_local *local = sdata->local;
819 int i, have_higher_than_11mbit = 0;
820
821 /* cf. IEEE 802.11 9.2.12 */
822 for (i = 0; i < supp_rates_len; i++)
823 if ((supp_rates[i] & 0x7f) * 5 > 110)
824 have_higher_than_11mbit = 1;
825
826 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
827 have_higher_than_11mbit)
828 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
829 else
830 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
831
832 ieee80211_set_wmm_default(sdata);
833 }
834
835 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
836 enum ieee80211_band band)
837 {
838 struct ieee80211_supported_band *sband;
839 struct ieee80211_rate *bitrates;
840 u32 mandatory_rates;
841 enum ieee80211_rate_flags mandatory_flag;
842 int i;
843
844 sband = local->hw.wiphy->bands[band];
845 if (!sband) {
846 WARN_ON(1);
847 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
848 }
849
850 if (band == IEEE80211_BAND_2GHZ)
851 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
852 else
853 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
854
855 bitrates = sband->bitrates;
856 mandatory_rates = 0;
857 for (i = 0; i < sband->n_bitrates; i++)
858 if (bitrates[i].flags & mandatory_flag)
859 mandatory_rates |= BIT(i);
860 return mandatory_rates;
861 }
862
863 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
864 u16 transaction, u16 auth_alg,
865 u8 *extra, size_t extra_len, const u8 *bssid,
866 const u8 *key, u8 key_len, u8 key_idx)
867 {
868 struct ieee80211_local *local = sdata->local;
869 struct sk_buff *skb;
870 struct ieee80211_mgmt *mgmt;
871 int err;
872
873 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
874 sizeof(*mgmt) + 6 + extra_len);
875 if (!skb)
876 return;
877
878 skb_reserve(skb, local->hw.extra_tx_headroom);
879
880 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
881 memset(mgmt, 0, 24 + 6);
882 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
883 IEEE80211_STYPE_AUTH);
884 memcpy(mgmt->da, bssid, ETH_ALEN);
885 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
886 memcpy(mgmt->bssid, bssid, ETH_ALEN);
887 mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
888 mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
889 mgmt->u.auth.status_code = cpu_to_le16(0);
890 if (extra)
891 memcpy(skb_put(skb, extra_len), extra, extra_len);
892
893 if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
894 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
895 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
896 WARN_ON(err);
897 }
898
899 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
900 ieee80211_tx_skb(sdata, skb);
901 }
902
903 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
904 const u8 *ie, size_t ie_len,
905 enum ieee80211_band band, u32 rate_mask,
906 u8 channel)
907 {
908 struct ieee80211_supported_band *sband;
909 u8 *pos;
910 size_t offset = 0, noffset;
911 int supp_rates_len, i;
912 u8 rates[32];
913 int num_rates;
914 int ext_rates_len;
915
916 sband = local->hw.wiphy->bands[band];
917
918 pos = buffer;
919
920 num_rates = 0;
921 for (i = 0; i < sband->n_bitrates; i++) {
922 if ((BIT(i) & rate_mask) == 0)
923 continue; /* skip rate */
924 rates[num_rates++] = (u8) (sband->bitrates[i].bitrate / 5);
925 }
926
927 supp_rates_len = min_t(int, num_rates, 8);
928
929 *pos++ = WLAN_EID_SUPP_RATES;
930 *pos++ = supp_rates_len;
931 memcpy(pos, rates, supp_rates_len);
932 pos += supp_rates_len;
933
934 /* insert "request information" if in custom IEs */
935 if (ie && ie_len) {
936 static const u8 before_extrates[] = {
937 WLAN_EID_SSID,
938 WLAN_EID_SUPP_RATES,
939 WLAN_EID_REQUEST,
940 };
941 noffset = ieee80211_ie_split(ie, ie_len,
942 before_extrates,
943 ARRAY_SIZE(before_extrates),
944 offset);
945 memcpy(pos, ie + offset, noffset - offset);
946 pos += noffset - offset;
947 offset = noffset;
948 }
949
950 ext_rates_len = num_rates - supp_rates_len;
951 if (ext_rates_len > 0) {
952 *pos++ = WLAN_EID_EXT_SUPP_RATES;
953 *pos++ = ext_rates_len;
954 memcpy(pos, rates + supp_rates_len, ext_rates_len);
955 pos += ext_rates_len;
956 }
957
958 if (channel && sband->band == IEEE80211_BAND_2GHZ) {
959 *pos++ = WLAN_EID_DS_PARAMS;
960 *pos++ = 1;
961 *pos++ = channel;
962 }
963
964 /* insert custom IEs that go before HT */
965 if (ie && ie_len) {
966 static const u8 before_ht[] = {
967 WLAN_EID_SSID,
968 WLAN_EID_SUPP_RATES,
969 WLAN_EID_REQUEST,
970 WLAN_EID_EXT_SUPP_RATES,
971 WLAN_EID_DS_PARAMS,
972 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
973 };
974 noffset = ieee80211_ie_split(ie, ie_len,
975 before_ht, ARRAY_SIZE(before_ht),
976 offset);
977 memcpy(pos, ie + offset, noffset - offset);
978 pos += noffset - offset;
979 offset = noffset;
980 }
981
982 if (sband->ht_cap.ht_supported)
983 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
984 sband->ht_cap.cap);
985
986 /*
987 * If adding more here, adjust code in main.c
988 * that calculates local->scan_ies_len.
989 */
990
991 /* add any remaining custom IEs */
992 if (ie && ie_len) {
993 noffset = ie_len;
994 memcpy(pos, ie + offset, noffset - offset);
995 pos += noffset - offset;
996 }
997
998 return pos - buffer;
999 }
1000
1001 struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
1002 u8 *dst, u32 ratemask,
1003 const u8 *ssid, size_t ssid_len,
1004 const u8 *ie, size_t ie_len,
1005 bool directed)
1006 {
1007 struct ieee80211_local *local = sdata->local;
1008 struct sk_buff *skb;
1009 struct ieee80211_mgmt *mgmt;
1010 size_t buf_len;
1011 u8 *buf;
1012 u8 chan;
1013
1014 /* FIXME: come up with a proper value */
1015 buf = kmalloc(200 + ie_len, GFP_KERNEL);
1016 if (!buf)
1017 return NULL;
1018
1019 /*
1020 * Do not send DS Channel parameter for directed probe requests
1021 * in order to maximize the chance that we get a response. Some
1022 * badly-behaved APs don't respond when this parameter is included.
1023 */
1024 if (directed)
1025 chan = 0;
1026 else
1027 chan = ieee80211_frequency_to_channel(
1028 local->hw.conf.channel->center_freq);
1029
1030 buf_len = ieee80211_build_preq_ies(local, buf, ie, ie_len,
1031 local->hw.conf.channel->band,
1032 ratemask, chan);
1033
1034 skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
1035 ssid, ssid_len,
1036 buf, buf_len);
1037 if (!skb)
1038 goto out;
1039
1040 if (dst) {
1041 mgmt = (struct ieee80211_mgmt *) skb->data;
1042 memcpy(mgmt->da, dst, ETH_ALEN);
1043 memcpy(mgmt->bssid, dst, ETH_ALEN);
1044 }
1045
1046 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1047
1048 out:
1049 kfree(buf);
1050
1051 return skb;
1052 }
1053
1054 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1055 const u8 *ssid, size_t ssid_len,
1056 const u8 *ie, size_t ie_len,
1057 u32 ratemask, bool directed, bool no_cck)
1058 {
1059 struct sk_buff *skb;
1060
1061 skb = ieee80211_build_probe_req(sdata, dst, ratemask, ssid, ssid_len,
1062 ie, ie_len, directed);
1063 if (skb) {
1064 if (no_cck)
1065 IEEE80211_SKB_CB(skb)->flags |=
1066 IEEE80211_TX_CTL_NO_CCK_RATE;
1067 ieee80211_tx_skb(sdata, skb);
1068 }
1069 }
1070
1071 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
1072 struct ieee802_11_elems *elems,
1073 enum ieee80211_band band)
1074 {
1075 struct ieee80211_supported_band *sband;
1076 struct ieee80211_rate *bitrates;
1077 size_t num_rates;
1078 u32 supp_rates;
1079 int i, j;
1080 sband = local->hw.wiphy->bands[band];
1081
1082 if (!sband) {
1083 WARN_ON(1);
1084 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1085 }
1086
1087 bitrates = sband->bitrates;
1088 num_rates = sband->n_bitrates;
1089 supp_rates = 0;
1090 for (i = 0; i < elems->supp_rates_len +
1091 elems->ext_supp_rates_len; i++) {
1092 u8 rate = 0;
1093 int own_rate;
1094 if (i < elems->supp_rates_len)
1095 rate = elems->supp_rates[i];
1096 else if (elems->ext_supp_rates)
1097 rate = elems->ext_supp_rates
1098 [i - elems->supp_rates_len];
1099 own_rate = 5 * (rate & 0x7f);
1100 for (j = 0; j < num_rates; j++)
1101 if (bitrates[j].bitrate == own_rate)
1102 supp_rates |= BIT(j);
1103 }
1104 return supp_rates;
1105 }
1106
1107 void ieee80211_stop_device(struct ieee80211_local *local)
1108 {
1109 ieee80211_led_radio(local, false);
1110 ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
1111
1112 cancel_work_sync(&local->reconfig_filter);
1113
1114 flush_workqueue(local->workqueue);
1115 drv_stop(local);
1116 }
1117
1118 int ieee80211_reconfig(struct ieee80211_local *local)
1119 {
1120 struct ieee80211_hw *hw = &local->hw;
1121 struct ieee80211_sub_if_data *sdata;
1122 struct sta_info *sta;
1123 int res, i;
1124
1125 #ifdef CONFIG_PM
1126 if (local->suspended)
1127 local->resuming = true;
1128
1129 if (local->wowlan) {
1130 local->wowlan = false;
1131 res = drv_resume(local);
1132 if (res < 0) {
1133 local->resuming = false;
1134 return res;
1135 }
1136 if (res == 0)
1137 goto wake_up;
1138 WARN_ON(res > 1);
1139 /*
1140 * res is 1, which means the driver requested
1141 * to go through a regular reset on wakeup.
1142 */
1143 }
1144 #endif
1145 /* everything else happens only if HW was up & running */
1146 if (!local->open_count)
1147 goto wake_up;
1148
1149 /*
1150 * Upon resume hardware can sometimes be goofy due to
1151 * various platform / driver / bus issues, so restarting
1152 * the device may at times not work immediately. Propagate
1153 * the error.
1154 */
1155 res = drv_start(local);
1156 if (res) {
1157 WARN(local->suspended, "Hardware became unavailable "
1158 "upon resume. This could be a software issue "
1159 "prior to suspend or a hardware issue.\n");
1160 return res;
1161 }
1162
1163 /* setup fragmentation threshold */
1164 drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
1165
1166 /* setup RTS threshold */
1167 drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1168
1169 /* reset coverage class */
1170 drv_set_coverage_class(local, hw->wiphy->coverage_class);
1171
1172 ieee80211_led_radio(local, true);
1173 ieee80211_mod_tpt_led_trig(local,
1174 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1175
1176 /* add interfaces */
1177 list_for_each_entry(sdata, &local->interfaces, list) {
1178 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1179 sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1180 ieee80211_sdata_running(sdata))
1181 res = drv_add_interface(local, sdata);
1182 }
1183
1184 /* add STAs back */
1185 mutex_lock(&local->sta_mtx);
1186 list_for_each_entry(sta, &local->sta_list, list) {
1187 if (sta->uploaded) {
1188 sdata = sta->sdata;
1189 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1190 sdata = container_of(sdata->bss,
1191 struct ieee80211_sub_if_data,
1192 u.ap);
1193
1194 WARN_ON(drv_sta_add(local, sdata, &sta->sta));
1195 }
1196 }
1197 mutex_unlock(&local->sta_mtx);
1198
1199 /* reconfigure tx conf */
1200 list_for_each_entry(sdata, &local->interfaces, list) {
1201 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1202 sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1203 !ieee80211_sdata_running(sdata))
1204 continue;
1205
1206 for (i = 0; i < hw->queues; i++)
1207 drv_conf_tx(local, sdata, i, &sdata->tx_conf[i]);
1208 }
1209
1210 /* reconfigure hardware */
1211 ieee80211_hw_config(local, ~0);
1212
1213 ieee80211_configure_filter(local);
1214
1215 /* Finally also reconfigure all the BSS information */
1216 list_for_each_entry(sdata, &local->interfaces, list) {
1217 u32 changed;
1218
1219 if (!ieee80211_sdata_running(sdata))
1220 continue;
1221
1222 /* common change flags for all interface types */
1223 changed = BSS_CHANGED_ERP_CTS_PROT |
1224 BSS_CHANGED_ERP_PREAMBLE |
1225 BSS_CHANGED_ERP_SLOT |
1226 BSS_CHANGED_HT |
1227 BSS_CHANGED_BASIC_RATES |
1228 BSS_CHANGED_BEACON_INT |
1229 BSS_CHANGED_BSSID |
1230 BSS_CHANGED_CQM |
1231 BSS_CHANGED_QOS |
1232 BSS_CHANGED_IDLE;
1233
1234 switch (sdata->vif.type) {
1235 case NL80211_IFTYPE_STATION:
1236 changed |= BSS_CHANGED_ASSOC |
1237 BSS_CHANGED_ARP_FILTER;
1238 mutex_lock(&sdata->u.mgd.mtx);
1239 ieee80211_bss_info_change_notify(sdata, changed);
1240 mutex_unlock(&sdata->u.mgd.mtx);
1241 break;
1242 case NL80211_IFTYPE_ADHOC:
1243 changed |= BSS_CHANGED_IBSS;
1244 /* fall through */
1245 case NL80211_IFTYPE_AP:
1246 changed |= BSS_CHANGED_SSID;
1247
1248 if (sdata->vif.type == NL80211_IFTYPE_AP)
1249 changed |= BSS_CHANGED_AP_PROBE_RESP;
1250
1251 /* fall through */
1252 case NL80211_IFTYPE_MESH_POINT:
1253 changed |= BSS_CHANGED_BEACON |
1254 BSS_CHANGED_BEACON_ENABLED;
1255 ieee80211_bss_info_change_notify(sdata, changed);
1256 break;
1257 case NL80211_IFTYPE_WDS:
1258 break;
1259 case NL80211_IFTYPE_AP_VLAN:
1260 case NL80211_IFTYPE_MONITOR:
1261 /* ignore virtual */
1262 break;
1263 case NL80211_IFTYPE_UNSPECIFIED:
1264 case NUM_NL80211_IFTYPES:
1265 case NL80211_IFTYPE_P2P_CLIENT:
1266 case NL80211_IFTYPE_P2P_GO:
1267 WARN_ON(1);
1268 break;
1269 }
1270 }
1271
1272 ieee80211_recalc_ps(local, -1);
1273
1274 /*
1275 * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
1276 * sessions can be established after a resume.
1277 *
1278 * Also tear down aggregation sessions since reconfiguring
1279 * them in a hardware restart scenario is not easily done
1280 * right now, and the hardware will have lost information
1281 * about the sessions, but we and the AP still think they
1282 * are active. This is really a workaround though.
1283 */
1284 if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1285 mutex_lock(&local->sta_mtx);
1286
1287 list_for_each_entry(sta, &local->sta_list, list) {
1288 ieee80211_sta_tear_down_BA_sessions(sta, true);
1289 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
1290 }
1291
1292 mutex_unlock(&local->sta_mtx);
1293 }
1294
1295 /* add back keys */
1296 list_for_each_entry(sdata, &local->interfaces, list)
1297 if (ieee80211_sdata_running(sdata))
1298 ieee80211_enable_keys(sdata);
1299
1300 wake_up:
1301 ieee80211_wake_queues_by_reason(hw,
1302 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1303
1304 /*
1305 * If this is for hw restart things are still running.
1306 * We may want to change that later, however.
1307 */
1308 if (!local->suspended)
1309 return 0;
1310
1311 #ifdef CONFIG_PM
1312 /* first set suspended false, then resuming */
1313 local->suspended = false;
1314 mb();
1315 local->resuming = false;
1316
1317 list_for_each_entry(sdata, &local->interfaces, list) {
1318 switch(sdata->vif.type) {
1319 case NL80211_IFTYPE_STATION:
1320 ieee80211_sta_restart(sdata);
1321 break;
1322 case NL80211_IFTYPE_ADHOC:
1323 ieee80211_ibss_restart(sdata);
1324 break;
1325 case NL80211_IFTYPE_MESH_POINT:
1326 ieee80211_mesh_restart(sdata);
1327 break;
1328 default:
1329 break;
1330 }
1331 }
1332
1333 mod_timer(&local->sta_cleanup, jiffies + 1);
1334
1335 mutex_lock(&local->sta_mtx);
1336 list_for_each_entry(sta, &local->sta_list, list)
1337 mesh_plink_restart(sta);
1338 mutex_unlock(&local->sta_mtx);
1339 #else
1340 WARN_ON(1);
1341 #endif
1342 return 0;
1343 }
1344
1345 void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
1346 {
1347 struct ieee80211_sub_if_data *sdata;
1348 struct ieee80211_local *local;
1349 struct ieee80211_key *key;
1350
1351 if (WARN_ON(!vif))
1352 return;
1353
1354 sdata = vif_to_sdata(vif);
1355 local = sdata->local;
1356
1357 if (WARN_ON(!local->resuming))
1358 return;
1359
1360 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1361 return;
1362
1363 sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;
1364
1365 mutex_lock(&local->key_mtx);
1366 list_for_each_entry(key, &sdata->key_list, list)
1367 key->flags |= KEY_FLAG_TAINTED;
1368 mutex_unlock(&local->key_mtx);
1369 }
1370 EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);
1371
1372 static int check_mgd_smps(struct ieee80211_if_managed *ifmgd,
1373 enum ieee80211_smps_mode *smps_mode)
1374 {
1375 if (ifmgd->associated) {
1376 *smps_mode = ifmgd->ap_smps;
1377
1378 if (*smps_mode == IEEE80211_SMPS_AUTOMATIC) {
1379 if (ifmgd->powersave)
1380 *smps_mode = IEEE80211_SMPS_DYNAMIC;
1381 else
1382 *smps_mode = IEEE80211_SMPS_OFF;
1383 }
1384
1385 return 1;
1386 }
1387
1388 return 0;
1389 }
1390
1391 /* must hold iflist_mtx */
1392 void ieee80211_recalc_smps(struct ieee80211_local *local)
1393 {
1394 struct ieee80211_sub_if_data *sdata;
1395 enum ieee80211_smps_mode smps_mode = IEEE80211_SMPS_OFF;
1396 int count = 0;
1397
1398 lockdep_assert_held(&local->iflist_mtx);
1399
1400 /*
1401 * This function could be improved to handle multiple
1402 * interfaces better, but right now it makes any
1403 * non-station interfaces force SM PS to be turned
1404 * off. If there are multiple station interfaces it
1405 * could also use the best possible mode, e.g. if
1406 * one is in static and the other in dynamic then
1407 * dynamic is ok.
1408 */
1409
1410 list_for_each_entry(sdata, &local->interfaces, list) {
1411 if (!ieee80211_sdata_running(sdata))
1412 continue;
1413 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1414 goto set;
1415
1416 count += check_mgd_smps(&sdata->u.mgd, &smps_mode);
1417
1418 if (count > 1) {
1419 smps_mode = IEEE80211_SMPS_OFF;
1420 break;
1421 }
1422 }
1423
1424 if (smps_mode == local->smps_mode)
1425 return;
1426
1427 set:
1428 local->smps_mode = smps_mode;
1429 /* changed flag is auto-detected for this */
1430 ieee80211_hw_config(local, 0);
1431 }
1432
1433 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1434 {
1435 int i;
1436
1437 for (i = 0; i < n_ids; i++)
1438 if (ids[i] == id)
1439 return true;
1440 return false;
1441 }
1442
1443 /**
1444 * ieee80211_ie_split - split an IE buffer according to ordering
1445 *
1446 * @ies: the IE buffer
1447 * @ielen: the length of the IE buffer
1448 * @ids: an array with element IDs that are allowed before
1449 * the split
1450 * @n_ids: the size of the element ID array
1451 * @offset: offset where to start splitting in the buffer
1452 *
1453 * This function splits an IE buffer by updating the @offset
1454 * variable to point to the location where the buffer should be
1455 * split.
1456 *
1457 * It assumes that the given IE buffer is well-formed, this
1458 * has to be guaranteed by the caller!
1459 *
1460 * It also assumes that the IEs in the buffer are ordered
1461 * correctly, if not the result of using this function will not
1462 * be ordered correctly either, i.e. it does no reordering.
1463 *
1464 * The function returns the offset where the next part of the
1465 * buffer starts, which may be @ielen if the entire (remainder)
1466 * of the buffer should be used.
1467 */
1468 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1469 const u8 *ids, int n_ids, size_t offset)
1470 {
1471 size_t pos = offset;
1472
1473 while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1474 pos += 2 + ies[pos + 1];
1475
1476 return pos;
1477 }
1478
1479 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1480 {
1481 size_t pos = offset;
1482
1483 while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1484 pos += 2 + ies[pos + 1];
1485
1486 return pos;
1487 }
1488
1489 static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
1490 int rssi_min_thold,
1491 int rssi_max_thold)
1492 {
1493 trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);
1494
1495 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1496 return;
1497
1498 /*
1499 * Scale up threshold values before storing it, as the RSSI averaging
1500 * algorithm uses a scaled up value as well. Change this scaling
1501 * factor if the RSSI averaging algorithm changes.
1502 */
1503 sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
1504 sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
1505 }
1506
1507 void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
1508 int rssi_min_thold,
1509 int rssi_max_thold)
1510 {
1511 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1512
1513 WARN_ON(rssi_min_thold == rssi_max_thold ||
1514 rssi_min_thold > rssi_max_thold);
1515
1516 _ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
1517 rssi_max_thold);
1518 }
1519 EXPORT_SYMBOL(ieee80211_enable_rssi_reports);
1520
1521 void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
1522 {
1523 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1524
1525 _ieee80211_enable_rssi_reports(sdata, 0, 0);
1526 }
1527 EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
1528
1529 u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1530 u16 cap)
1531 {
1532 __le16 tmp;
1533
1534 *pos++ = WLAN_EID_HT_CAPABILITY;
1535 *pos++ = sizeof(struct ieee80211_ht_cap);
1536 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
1537
1538 /* capability flags */
1539 tmp = cpu_to_le16(cap);
1540 memcpy(pos, &tmp, sizeof(u16));
1541 pos += sizeof(u16);
1542
1543 /* AMPDU parameters */
1544 *pos++ = ht_cap->ampdu_factor |
1545 (ht_cap->ampdu_density <<
1546 IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
1547
1548 /* MCS set */
1549 memcpy(pos, &ht_cap->mcs, sizeof(ht_cap->mcs));
1550 pos += sizeof(ht_cap->mcs);
1551
1552 /* extended capabilities */
1553 pos += sizeof(__le16);
1554
1555 /* BF capabilities */
1556 pos += sizeof(__le32);
1557
1558 /* antenna selection */
1559 pos += sizeof(u8);
1560
1561 return pos;
1562 }
1563
1564 u8 *ieee80211_ie_build_ht_info(u8 *pos,
1565 struct ieee80211_sta_ht_cap *ht_cap,
1566 struct ieee80211_channel *channel,
1567 enum nl80211_channel_type channel_type)
1568 {
1569 struct ieee80211_ht_info *ht_info;
1570 /* Build HT Information */
1571 *pos++ = WLAN_EID_HT_INFORMATION;
1572 *pos++ = sizeof(struct ieee80211_ht_info);
1573 ht_info = (struct ieee80211_ht_info *)pos;
1574 ht_info->control_chan =
1575 ieee80211_frequency_to_channel(channel->center_freq);
1576 switch (channel_type) {
1577 case NL80211_CHAN_HT40MINUS:
1578 ht_info->ht_param = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1579 break;
1580 case NL80211_CHAN_HT40PLUS:
1581 ht_info->ht_param = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
1582 break;
1583 case NL80211_CHAN_HT20:
1584 default:
1585 ht_info->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
1586 break;
1587 }
1588 if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40)
1589 ht_info->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
1590
1591 /*
1592 * Note: According to 802.11n-2009 9.13.3.1, HT Protection field and
1593 * RIFS Mode are reserved in IBSS mode, therefore keep them at 0
1594 */
1595 ht_info->operation_mode = 0x0000;
1596 ht_info->stbc_param = 0x0000;
1597
1598 /* It seems that Basic MCS set and Supported MCS set
1599 are identical for the first 10 bytes */
1600 memset(&ht_info->basic_set, 0, 16);
1601 memcpy(&ht_info->basic_set, &ht_cap->mcs, 10);
1602
1603 return pos + sizeof(struct ieee80211_ht_info);
1604 }
1605
1606 enum nl80211_channel_type
1607 ieee80211_ht_info_to_channel_type(struct ieee80211_ht_info *ht_info)
1608 {
1609 enum nl80211_channel_type channel_type;
1610
1611 if (!ht_info)
1612 return NL80211_CHAN_NO_HT;
1613
1614 switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
1615 case IEEE80211_HT_PARAM_CHA_SEC_NONE:
1616 channel_type = NL80211_CHAN_HT20;
1617 break;
1618 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1619 channel_type = NL80211_CHAN_HT40PLUS;
1620 break;
1621 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1622 channel_type = NL80211_CHAN_HT40MINUS;
1623 break;
1624 default:
1625 channel_type = NL80211_CHAN_NO_HT;
1626 }
1627
1628 return channel_type;
1629 }
1630
1631 int ieee80211_add_srates_ie(struct ieee80211_vif *vif, struct sk_buff *skb)
1632 {
1633 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1634 struct ieee80211_local *local = sdata->local;
1635 struct ieee80211_supported_band *sband;
1636 int rate;
1637 u8 i, rates, *pos;
1638
1639 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1640 rates = sband->n_bitrates;
1641 if (rates > 8)
1642 rates = 8;
1643
1644 if (skb_tailroom(skb) < rates + 2)
1645 return -ENOMEM;
1646
1647 pos = skb_put(skb, rates + 2);
1648 *pos++ = WLAN_EID_SUPP_RATES;
1649 *pos++ = rates;
1650 for (i = 0; i < rates; i++) {
1651 rate = sband->bitrates[i].bitrate;
1652 *pos++ = (u8) (rate / 5);
1653 }
1654
1655 return 0;
1656 }
1657
1658 int ieee80211_add_ext_srates_ie(struct ieee80211_vif *vif, struct sk_buff *skb)
1659 {
1660 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1661 struct ieee80211_local *local = sdata->local;
1662 struct ieee80211_supported_band *sband;
1663 int rate;
1664 u8 i, exrates, *pos;
1665
1666 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1667 exrates = sband->n_bitrates;
1668 if (exrates > 8)
1669 exrates -= 8;
1670 else
1671 exrates = 0;
1672
1673 if (skb_tailroom(skb) < exrates + 2)
1674 return -ENOMEM;
1675
1676 if (exrates) {
1677 pos = skb_put(skb, exrates + 2);
1678 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1679 *pos++ = exrates;
1680 for (i = 8; i < sband->n_bitrates; i++) {
1681 rate = sband->bitrates[i].bitrate;
1682 *pos++ = (u8) (rate / 5);
1683 }
1684 }
1685 return 0;
1686 }