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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland...
[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 <net/net_namespace.h>
23 #include <net/cfg80211.h>
24 #include <net/rtnetlink.h>
25
26 #include "ieee80211_i.h"
27 #include "driver-ops.h"
28 #include "rate.h"
29 #include "mesh.h"
30 #include "wme.h"
31 #include "led.h"
32 #include "wep.h"
33
34 /* privid for wiphys to determine whether they belong to us or not */
35 void *mac80211_wiphy_privid = &mac80211_wiphy_privid;
36
37 struct ieee80211_hw *wiphy_to_ieee80211_hw(struct wiphy *wiphy)
38 {
39 struct ieee80211_local *local;
40 BUG_ON(!wiphy);
41
42 local = wiphy_priv(wiphy);
43 return &local->hw;
44 }
45 EXPORT_SYMBOL(wiphy_to_ieee80211_hw);
46
47 u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
48 enum nl80211_iftype type)
49 {
50 __le16 fc = hdr->frame_control;
51
52 /* drop ACK/CTS frames and incorrect hdr len (ctrl) */
53 if (len < 16)
54 return NULL;
55
56 if (ieee80211_is_data(fc)) {
57 if (len < 24) /* drop incorrect hdr len (data) */
58 return NULL;
59
60 if (ieee80211_has_a4(fc))
61 return NULL;
62 if (ieee80211_has_tods(fc))
63 return hdr->addr1;
64 if (ieee80211_has_fromds(fc))
65 return hdr->addr2;
66
67 return hdr->addr3;
68 }
69
70 if (ieee80211_is_mgmt(fc)) {
71 if (len < 24) /* drop incorrect hdr len (mgmt) */
72 return NULL;
73 return hdr->addr3;
74 }
75
76 if (ieee80211_is_ctl(fc)) {
77 if(ieee80211_is_pspoll(fc))
78 return hdr->addr1;
79
80 if (ieee80211_is_back_req(fc)) {
81 switch (type) {
82 case NL80211_IFTYPE_STATION:
83 return hdr->addr2;
84 case NL80211_IFTYPE_AP:
85 case NL80211_IFTYPE_AP_VLAN:
86 return hdr->addr1;
87 default:
88 break; /* fall through to the return */
89 }
90 }
91 }
92
93 return NULL;
94 }
95
96 void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
97 {
98 struct sk_buff *skb = tx->skb;
99 struct ieee80211_hdr *hdr;
100
101 do {
102 hdr = (struct ieee80211_hdr *) skb->data;
103 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
104 } while ((skb = skb->next));
105 }
106
107 int ieee80211_frame_duration(struct ieee80211_local *local, size_t len,
108 int rate, int erp, int short_preamble)
109 {
110 int dur;
111
112 /* calculate duration (in microseconds, rounded up to next higher
113 * integer if it includes a fractional microsecond) to send frame of
114 * len bytes (does not include FCS) at the given rate. Duration will
115 * also include SIFS.
116 *
117 * rate is in 100 kbps, so divident is multiplied by 10 in the
118 * DIV_ROUND_UP() operations.
119 */
120
121 if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ || erp) {
122 /*
123 * OFDM:
124 *
125 * N_DBPS = DATARATE x 4
126 * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
127 * (16 = SIGNAL time, 6 = tail bits)
128 * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
129 *
130 * T_SYM = 4 usec
131 * 802.11a - 17.5.2: aSIFSTime = 16 usec
132 * 802.11g - 19.8.4: aSIFSTime = 10 usec +
133 * signal ext = 6 usec
134 */
135 dur = 16; /* SIFS + signal ext */
136 dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */
137 dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */
138 dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
139 4 * rate); /* T_SYM x N_SYM */
140 } else {
141 /*
142 * 802.11b or 802.11g with 802.11b compatibility:
143 * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
144 * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
145 *
146 * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
147 * aSIFSTime = 10 usec
148 * aPreambleLength = 144 usec or 72 usec with short preamble
149 * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
150 */
151 dur = 10; /* aSIFSTime = 10 usec */
152 dur += short_preamble ? (72 + 24) : (144 + 48);
153
154 dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
155 }
156
157 return dur;
158 }
159
160 /* Exported duration function for driver use */
161 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
162 struct ieee80211_vif *vif,
163 size_t frame_len,
164 struct ieee80211_rate *rate)
165 {
166 struct ieee80211_local *local = hw_to_local(hw);
167 struct ieee80211_sub_if_data *sdata;
168 u16 dur;
169 int erp;
170 bool short_preamble = false;
171
172 erp = 0;
173 if (vif) {
174 sdata = vif_to_sdata(vif);
175 short_preamble = sdata->vif.bss_conf.use_short_preamble;
176 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
177 erp = rate->flags & IEEE80211_RATE_ERP_G;
178 }
179
180 dur = ieee80211_frame_duration(local, frame_len, rate->bitrate, erp,
181 short_preamble);
182
183 return cpu_to_le16(dur);
184 }
185 EXPORT_SYMBOL(ieee80211_generic_frame_duration);
186
187 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
188 struct ieee80211_vif *vif, size_t frame_len,
189 const struct ieee80211_tx_info *frame_txctl)
190 {
191 struct ieee80211_local *local = hw_to_local(hw);
192 struct ieee80211_rate *rate;
193 struct ieee80211_sub_if_data *sdata;
194 bool short_preamble;
195 int erp;
196 u16 dur;
197 struct ieee80211_supported_band *sband;
198
199 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
200
201 short_preamble = false;
202
203 rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
204
205 erp = 0;
206 if (vif) {
207 sdata = vif_to_sdata(vif);
208 short_preamble = sdata->vif.bss_conf.use_short_preamble;
209 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
210 erp = rate->flags & IEEE80211_RATE_ERP_G;
211 }
212
213 /* CTS duration */
214 dur = ieee80211_frame_duration(local, 10, rate->bitrate,
215 erp, short_preamble);
216 /* Data frame duration */
217 dur += ieee80211_frame_duration(local, frame_len, rate->bitrate,
218 erp, short_preamble);
219 /* ACK duration */
220 dur += ieee80211_frame_duration(local, 10, rate->bitrate,
221 erp, short_preamble);
222
223 return cpu_to_le16(dur);
224 }
225 EXPORT_SYMBOL(ieee80211_rts_duration);
226
227 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
228 struct ieee80211_vif *vif,
229 size_t frame_len,
230 const struct ieee80211_tx_info *frame_txctl)
231 {
232 struct ieee80211_local *local = hw_to_local(hw);
233 struct ieee80211_rate *rate;
234 struct ieee80211_sub_if_data *sdata;
235 bool short_preamble;
236 int erp;
237 u16 dur;
238 struct ieee80211_supported_band *sband;
239
240 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
241
242 short_preamble = false;
243
244 rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
245 erp = 0;
246 if (vif) {
247 sdata = vif_to_sdata(vif);
248 short_preamble = sdata->vif.bss_conf.use_short_preamble;
249 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
250 erp = rate->flags & IEEE80211_RATE_ERP_G;
251 }
252
253 /* Data frame duration */
254 dur = ieee80211_frame_duration(local, frame_len, rate->bitrate,
255 erp, short_preamble);
256 if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
257 /* ACK duration */
258 dur += ieee80211_frame_duration(local, 10, rate->bitrate,
259 erp, short_preamble);
260 }
261
262 return cpu_to_le16(dur);
263 }
264 EXPORT_SYMBOL(ieee80211_ctstoself_duration);
265
266 static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
267 enum queue_stop_reason reason)
268 {
269 struct ieee80211_local *local = hw_to_local(hw);
270 struct ieee80211_sub_if_data *sdata;
271
272 trace_wake_queue(local, queue, reason);
273
274 if (WARN_ON(queue >= hw->queues))
275 return;
276
277 __clear_bit(reason, &local->queue_stop_reasons[queue]);
278
279 if (local->queue_stop_reasons[queue] != 0)
280 /* someone still has this queue stopped */
281 return;
282
283 if (skb_queue_empty(&local->pending[queue])) {
284 rcu_read_lock();
285 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
286 if (test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))
287 continue;
288 netif_wake_subqueue(sdata->dev, queue);
289 }
290 rcu_read_unlock();
291 } else
292 tasklet_schedule(&local->tx_pending_tasklet);
293 }
294
295 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
296 enum queue_stop_reason reason)
297 {
298 struct ieee80211_local *local = hw_to_local(hw);
299 unsigned long flags;
300
301 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
302 __ieee80211_wake_queue(hw, queue, reason);
303 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
304 }
305
306 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
307 {
308 ieee80211_wake_queue_by_reason(hw, queue,
309 IEEE80211_QUEUE_STOP_REASON_DRIVER);
310 }
311 EXPORT_SYMBOL(ieee80211_wake_queue);
312
313 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
314 enum queue_stop_reason reason)
315 {
316 struct ieee80211_local *local = hw_to_local(hw);
317 struct ieee80211_sub_if_data *sdata;
318
319 trace_stop_queue(local, queue, reason);
320
321 if (WARN_ON(queue >= hw->queues))
322 return;
323
324 __set_bit(reason, &local->queue_stop_reasons[queue]);
325
326 rcu_read_lock();
327 list_for_each_entry_rcu(sdata, &local->interfaces, list)
328 netif_stop_subqueue(sdata->dev, queue);
329 rcu_read_unlock();
330 }
331
332 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
333 enum queue_stop_reason reason)
334 {
335 struct ieee80211_local *local = hw_to_local(hw);
336 unsigned long flags;
337
338 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
339 __ieee80211_stop_queue(hw, queue, reason);
340 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
341 }
342
343 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
344 {
345 ieee80211_stop_queue_by_reason(hw, queue,
346 IEEE80211_QUEUE_STOP_REASON_DRIVER);
347 }
348 EXPORT_SYMBOL(ieee80211_stop_queue);
349
350 void ieee80211_add_pending_skb(struct ieee80211_local *local,
351 struct sk_buff *skb)
352 {
353 struct ieee80211_hw *hw = &local->hw;
354 unsigned long flags;
355 int queue = skb_get_queue_mapping(skb);
356 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
357
358 if (WARN_ON(!info->control.vif)) {
359 kfree_skb(skb);
360 return;
361 }
362
363 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
364 __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
365 __skb_queue_tail(&local->pending[queue], skb);
366 __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
367 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
368 }
369
370 void ieee80211_add_pending_skbs_fn(struct ieee80211_local *local,
371 struct sk_buff_head *skbs,
372 void (*fn)(void *data), void *data)
373 {
374 struct ieee80211_hw *hw = &local->hw;
375 struct sk_buff *skb;
376 unsigned long flags;
377 int queue, i;
378
379 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
380 for (i = 0; i < hw->queues; i++)
381 __ieee80211_stop_queue(hw, i,
382 IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
383
384 while ((skb = skb_dequeue(skbs))) {
385 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
386
387 if (WARN_ON(!info->control.vif)) {
388 kfree_skb(skb);
389 continue;
390 }
391
392 queue = skb_get_queue_mapping(skb);
393 __skb_queue_tail(&local->pending[queue], skb);
394 }
395
396 if (fn)
397 fn(data);
398
399 for (i = 0; i < hw->queues; i++)
400 __ieee80211_wake_queue(hw, i,
401 IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
402 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
403 }
404
405 void ieee80211_add_pending_skbs(struct ieee80211_local *local,
406 struct sk_buff_head *skbs)
407 {
408 ieee80211_add_pending_skbs_fn(local, skbs, NULL, NULL);
409 }
410
411 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
412 enum queue_stop_reason reason)
413 {
414 struct ieee80211_local *local = hw_to_local(hw);
415 unsigned long flags;
416 int i;
417
418 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
419
420 for (i = 0; i < hw->queues; i++)
421 __ieee80211_stop_queue(hw, i, reason);
422
423 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
424 }
425
426 void ieee80211_stop_queues(struct ieee80211_hw *hw)
427 {
428 ieee80211_stop_queues_by_reason(hw,
429 IEEE80211_QUEUE_STOP_REASON_DRIVER);
430 }
431 EXPORT_SYMBOL(ieee80211_stop_queues);
432
433 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
434 {
435 struct ieee80211_local *local = hw_to_local(hw);
436 unsigned long flags;
437 int ret;
438
439 if (WARN_ON(queue >= hw->queues))
440 return true;
441
442 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
443 ret = !!local->queue_stop_reasons[queue];
444 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
445 return ret;
446 }
447 EXPORT_SYMBOL(ieee80211_queue_stopped);
448
449 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
450 enum queue_stop_reason reason)
451 {
452 struct ieee80211_local *local = hw_to_local(hw);
453 unsigned long flags;
454 int i;
455
456 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
457
458 for (i = 0; i < hw->queues; i++)
459 __ieee80211_wake_queue(hw, i, reason);
460
461 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
462 }
463
464 void ieee80211_wake_queues(struct ieee80211_hw *hw)
465 {
466 ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
467 }
468 EXPORT_SYMBOL(ieee80211_wake_queues);
469
470 void ieee80211_iterate_active_interfaces(
471 struct ieee80211_hw *hw,
472 void (*iterator)(void *data, u8 *mac,
473 struct ieee80211_vif *vif),
474 void *data)
475 {
476 struct ieee80211_local *local = hw_to_local(hw);
477 struct ieee80211_sub_if_data *sdata;
478
479 mutex_lock(&local->iflist_mtx);
480
481 list_for_each_entry(sdata, &local->interfaces, list) {
482 switch (sdata->vif.type) {
483 case NL80211_IFTYPE_MONITOR:
484 case NL80211_IFTYPE_AP_VLAN:
485 continue;
486 default:
487 break;
488 }
489 if (ieee80211_sdata_running(sdata))
490 iterator(data, sdata->vif.addr,
491 &sdata->vif);
492 }
493
494 mutex_unlock(&local->iflist_mtx);
495 }
496 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
497
498 void ieee80211_iterate_active_interfaces_atomic(
499 struct ieee80211_hw *hw,
500 void (*iterator)(void *data, u8 *mac,
501 struct ieee80211_vif *vif),
502 void *data)
503 {
504 struct ieee80211_local *local = hw_to_local(hw);
505 struct ieee80211_sub_if_data *sdata;
506
507 rcu_read_lock();
508
509 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
510 switch (sdata->vif.type) {
511 case NL80211_IFTYPE_MONITOR:
512 case NL80211_IFTYPE_AP_VLAN:
513 continue;
514 default:
515 break;
516 }
517 if (ieee80211_sdata_running(sdata))
518 iterator(data, sdata->vif.addr,
519 &sdata->vif);
520 }
521
522 rcu_read_unlock();
523 }
524 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
525
526 /*
527 * Nothing should have been stuffed into the workqueue during
528 * the suspend->resume cycle. If this WARN is seen then there
529 * is a bug with either the driver suspend or something in
530 * mac80211 stuffing into the workqueue which we haven't yet
531 * cleared during mac80211's suspend cycle.
532 */
533 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
534 {
535 if (WARN(local->suspended && !local->resuming,
536 "queueing ieee80211 work while going to suspend\n"))
537 return false;
538
539 return true;
540 }
541
542 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
543 {
544 struct ieee80211_local *local = hw_to_local(hw);
545
546 if (!ieee80211_can_queue_work(local))
547 return;
548
549 queue_work(local->workqueue, work);
550 }
551 EXPORT_SYMBOL(ieee80211_queue_work);
552
553 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
554 struct delayed_work *dwork,
555 unsigned long delay)
556 {
557 struct ieee80211_local *local = hw_to_local(hw);
558
559 if (!ieee80211_can_queue_work(local))
560 return;
561
562 queue_delayed_work(local->workqueue, dwork, delay);
563 }
564 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
565
566 void ieee802_11_parse_elems(u8 *start, size_t len,
567 struct ieee802_11_elems *elems)
568 {
569 ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
570 }
571
572 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata)
573 {
574 struct ieee80211_local *local = sdata->local;
575 struct ieee80211_tx_queue_params qparam;
576 int queue;
577 bool use_11b;
578 int aCWmin, aCWmax;
579
580 if (!local->ops->conf_tx)
581 return;
582
583 memset(&qparam, 0, sizeof(qparam));
584
585 use_11b = (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) &&
586 !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
587
588 for (queue = 0; queue < local_to_hw(local)->queues; queue++) {
589 /* Set defaults according to 802.11-2007 Table 7-37 */
590 aCWmax = 1023;
591 if (use_11b)
592 aCWmin = 31;
593 else
594 aCWmin = 15;
595
596 switch (queue) {
597 case 3: /* AC_BK */
598 qparam.cw_max = aCWmax;
599 qparam.cw_min = aCWmin;
600 qparam.txop = 0;
601 qparam.aifs = 7;
602 break;
603 default: /* never happens but let's not leave undefined */
604 case 2: /* AC_BE */
605 qparam.cw_max = aCWmax;
606 qparam.cw_min = aCWmin;
607 qparam.txop = 0;
608 qparam.aifs = 3;
609 break;
610 case 1: /* AC_VI */
611 qparam.cw_max = aCWmin;
612 qparam.cw_min = (aCWmin + 1) / 2 - 1;
613 if (use_11b)
614 qparam.txop = 6016/32;
615 else
616 qparam.txop = 3008/32;
617 qparam.aifs = 2;
618 break;
619 case 0: /* AC_VO */
620 qparam.cw_max = (aCWmin + 1) / 2 - 1;
621 qparam.cw_min = (aCWmin + 1) / 4 - 1;
622 if (use_11b)
623 qparam.txop = 3264/32;
624 else
625 qparam.txop = 1504/32;
626 qparam.aifs = 2;
627 break;
628 }
629
630 qparam.uapsd = false;
631
632 sdata->tx_conf[queue] = qparam;
633 drv_conf_tx(local, sdata, queue, &qparam);
634 }
635
636 /* after reinitialize QoS TX queues setting to default,
637 * disable QoS at all */
638
639 if (sdata->vif.type != NL80211_IFTYPE_MONITOR) {
640 sdata->vif.bss_conf.qos =
641 sdata->vif.type != NL80211_IFTYPE_STATION;
642 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_QOS);
643 }
644 }
645
646 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
647 const size_t supp_rates_len,
648 const u8 *supp_rates)
649 {
650 struct ieee80211_local *local = sdata->local;
651 int i, have_higher_than_11mbit = 0;
652
653 /* cf. IEEE 802.11 9.2.12 */
654 for (i = 0; i < supp_rates_len; i++)
655 if ((supp_rates[i] & 0x7f) * 5 > 110)
656 have_higher_than_11mbit = 1;
657
658 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
659 have_higher_than_11mbit)
660 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
661 else
662 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
663
664 ieee80211_set_wmm_default(sdata);
665 }
666
667 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
668 enum ieee80211_band band)
669 {
670 struct ieee80211_supported_band *sband;
671 struct ieee80211_rate *bitrates;
672 u32 mandatory_rates;
673 enum ieee80211_rate_flags mandatory_flag;
674 int i;
675
676 sband = local->hw.wiphy->bands[band];
677 if (!sband) {
678 WARN_ON(1);
679 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
680 }
681
682 if (band == IEEE80211_BAND_2GHZ)
683 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
684 else
685 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
686
687 bitrates = sband->bitrates;
688 mandatory_rates = 0;
689 for (i = 0; i < sband->n_bitrates; i++)
690 if (bitrates[i].flags & mandatory_flag)
691 mandatory_rates |= BIT(i);
692 return mandatory_rates;
693 }
694
695 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
696 u16 transaction, u16 auth_alg,
697 u8 *extra, size_t extra_len, const u8 *bssid,
698 const u8 *key, u8 key_len, u8 key_idx)
699 {
700 struct ieee80211_local *local = sdata->local;
701 struct sk_buff *skb;
702 struct ieee80211_mgmt *mgmt;
703 int err;
704
705 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
706 sizeof(*mgmt) + 6 + extra_len);
707 if (!skb)
708 return;
709
710 skb_reserve(skb, local->hw.extra_tx_headroom);
711
712 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
713 memset(mgmt, 0, 24 + 6);
714 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
715 IEEE80211_STYPE_AUTH);
716 memcpy(mgmt->da, bssid, ETH_ALEN);
717 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
718 memcpy(mgmt->bssid, bssid, ETH_ALEN);
719 mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
720 mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
721 mgmt->u.auth.status_code = cpu_to_le16(0);
722 if (extra)
723 memcpy(skb_put(skb, extra_len), extra, extra_len);
724
725 if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
726 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
727 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
728 WARN_ON(err);
729 }
730
731 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
732 ieee80211_tx_skb(sdata, skb);
733 }
734
735 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
736 const u8 *ie, size_t ie_len,
737 enum ieee80211_band band, u32 rate_mask,
738 u8 channel)
739 {
740 struct ieee80211_supported_band *sband;
741 u8 *pos;
742 size_t offset = 0, noffset;
743 int supp_rates_len, i;
744 u8 rates[32];
745 int num_rates;
746 int ext_rates_len;
747
748 sband = local->hw.wiphy->bands[band];
749
750 pos = buffer;
751
752 num_rates = 0;
753 for (i = 0; i < sband->n_bitrates; i++) {
754 if ((BIT(i) & rate_mask) == 0)
755 continue; /* skip rate */
756 rates[num_rates++] = (u8) (sband->bitrates[i].bitrate / 5);
757 }
758
759 supp_rates_len = min_t(int, num_rates, 8);
760
761 *pos++ = WLAN_EID_SUPP_RATES;
762 *pos++ = supp_rates_len;
763 memcpy(pos, rates, supp_rates_len);
764 pos += supp_rates_len;
765
766 /* insert "request information" if in custom IEs */
767 if (ie && ie_len) {
768 static const u8 before_extrates[] = {
769 WLAN_EID_SSID,
770 WLAN_EID_SUPP_RATES,
771 WLAN_EID_REQUEST,
772 };
773 noffset = ieee80211_ie_split(ie, ie_len,
774 before_extrates,
775 ARRAY_SIZE(before_extrates),
776 offset);
777 memcpy(pos, ie + offset, noffset - offset);
778 pos += noffset - offset;
779 offset = noffset;
780 }
781
782 ext_rates_len = num_rates - supp_rates_len;
783 if (ext_rates_len > 0) {
784 *pos++ = WLAN_EID_EXT_SUPP_RATES;
785 *pos++ = ext_rates_len;
786 memcpy(pos, rates + supp_rates_len, ext_rates_len);
787 pos += ext_rates_len;
788 }
789
790 if (channel && sband->band == IEEE80211_BAND_2GHZ) {
791 *pos++ = WLAN_EID_DS_PARAMS;
792 *pos++ = 1;
793 *pos++ = channel;
794 }
795
796 /* insert custom IEs that go before HT */
797 if (ie && ie_len) {
798 static const u8 before_ht[] = {
799 WLAN_EID_SSID,
800 WLAN_EID_SUPP_RATES,
801 WLAN_EID_REQUEST,
802 WLAN_EID_EXT_SUPP_RATES,
803 WLAN_EID_DS_PARAMS,
804 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
805 };
806 noffset = ieee80211_ie_split(ie, ie_len,
807 before_ht, ARRAY_SIZE(before_ht),
808 offset);
809 memcpy(pos, ie + offset, noffset - offset);
810 pos += noffset - offset;
811 offset = noffset;
812 }
813
814 if (sband->ht_cap.ht_supported) {
815 u16 cap = sband->ht_cap.cap;
816 __le16 tmp;
817
818 *pos++ = WLAN_EID_HT_CAPABILITY;
819 *pos++ = sizeof(struct ieee80211_ht_cap);
820 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
821 tmp = cpu_to_le16(cap);
822 memcpy(pos, &tmp, sizeof(u16));
823 pos += sizeof(u16);
824 *pos++ = sband->ht_cap.ampdu_factor |
825 (sband->ht_cap.ampdu_density <<
826 IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
827 memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs));
828 pos += sizeof(sband->ht_cap.mcs);
829 pos += 2 + 4 + 1; /* ext info, BF cap, antsel */
830 }
831
832 /*
833 * If adding more here, adjust code in main.c
834 * that calculates local->scan_ies_len.
835 */
836
837 /* add any remaining custom IEs */
838 if (ie && ie_len) {
839 noffset = ie_len;
840 memcpy(pos, ie + offset, noffset - offset);
841 pos += noffset - offset;
842 }
843
844 return pos - buffer;
845 }
846
847 struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
848 u8 *dst, u32 ratemask,
849 const u8 *ssid, size_t ssid_len,
850 const u8 *ie, size_t ie_len,
851 bool directed)
852 {
853 struct ieee80211_local *local = sdata->local;
854 struct sk_buff *skb;
855 struct ieee80211_mgmt *mgmt;
856 size_t buf_len;
857 u8 *buf;
858 u8 chan;
859
860 /* FIXME: come up with a proper value */
861 buf = kmalloc(200 + ie_len, GFP_KERNEL);
862 if (!buf)
863 return NULL;
864
865 /*
866 * Do not send DS Channel parameter for directed probe requests
867 * in order to maximize the chance that we get a response. Some
868 * badly-behaved APs don't respond when this parameter is included.
869 */
870 if (directed)
871 chan = 0;
872 else
873 chan = ieee80211_frequency_to_channel(
874 local->hw.conf.channel->center_freq);
875
876 buf_len = ieee80211_build_preq_ies(local, buf, ie, ie_len,
877 local->hw.conf.channel->band,
878 ratemask, chan);
879
880 skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
881 ssid, ssid_len,
882 buf, buf_len);
883
884 if (dst) {
885 mgmt = (struct ieee80211_mgmt *) skb->data;
886 memcpy(mgmt->da, dst, ETH_ALEN);
887 memcpy(mgmt->bssid, dst, ETH_ALEN);
888 }
889
890 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
891 kfree(buf);
892
893 return skb;
894 }
895
896 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
897 const u8 *ssid, size_t ssid_len,
898 const u8 *ie, size_t ie_len,
899 u32 ratemask, bool directed, bool no_cck)
900 {
901 struct sk_buff *skb;
902
903 skb = ieee80211_build_probe_req(sdata, dst, ratemask, ssid, ssid_len,
904 ie, ie_len, directed);
905 if (skb) {
906 if (no_cck)
907 IEEE80211_SKB_CB(skb)->flags |=
908 IEEE80211_TX_CTL_NO_CCK_RATE;
909 ieee80211_tx_skb(sdata, skb);
910 }
911 }
912
913 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
914 struct ieee802_11_elems *elems,
915 enum ieee80211_band band)
916 {
917 struct ieee80211_supported_band *sband;
918 struct ieee80211_rate *bitrates;
919 size_t num_rates;
920 u32 supp_rates;
921 int i, j;
922 sband = local->hw.wiphy->bands[band];
923
924 if (!sband) {
925 WARN_ON(1);
926 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
927 }
928
929 bitrates = sband->bitrates;
930 num_rates = sband->n_bitrates;
931 supp_rates = 0;
932 for (i = 0; i < elems->supp_rates_len +
933 elems->ext_supp_rates_len; i++) {
934 u8 rate = 0;
935 int own_rate;
936 if (i < elems->supp_rates_len)
937 rate = elems->supp_rates[i];
938 else if (elems->ext_supp_rates)
939 rate = elems->ext_supp_rates
940 [i - elems->supp_rates_len];
941 own_rate = 5 * (rate & 0x7f);
942 for (j = 0; j < num_rates; j++)
943 if (bitrates[j].bitrate == own_rate)
944 supp_rates |= BIT(j);
945 }
946 return supp_rates;
947 }
948
949 void ieee80211_stop_device(struct ieee80211_local *local)
950 {
951 ieee80211_led_radio(local, false);
952 ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
953
954 cancel_work_sync(&local->reconfig_filter);
955
956 flush_workqueue(local->workqueue);
957 drv_stop(local);
958 }
959
960 int ieee80211_reconfig(struct ieee80211_local *local)
961 {
962 struct ieee80211_hw *hw = &local->hw;
963 struct ieee80211_sub_if_data *sdata;
964 struct sta_info *sta;
965 int res, i;
966
967 #ifdef CONFIG_PM
968 if (local->suspended)
969 local->resuming = true;
970
971 if (local->wowlan) {
972 local->wowlan = false;
973 res = drv_resume(local);
974 if (res < 0) {
975 local->resuming = false;
976 return res;
977 }
978 if (res == 0)
979 goto wake_up;
980 WARN_ON(res > 1);
981 /*
982 * res is 1, which means the driver requested
983 * to go through a regular reset on wakeup.
984 */
985 }
986 #endif
987
988 /* setup fragmentation threshold */
989 drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
990
991 /* setup RTS threshold */
992 drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
993
994 /* reset coverage class */
995 drv_set_coverage_class(local, hw->wiphy->coverage_class);
996
997 /* everything else happens only if HW was up & running */
998 if (!local->open_count)
999 goto wake_up;
1000
1001 /*
1002 * Upon resume hardware can sometimes be goofy due to
1003 * various platform / driver / bus issues, so restarting
1004 * the device may at times not work immediately. Propagate
1005 * the error.
1006 */
1007 res = drv_start(local);
1008 if (res) {
1009 WARN(local->suspended, "Hardware became unavailable "
1010 "upon resume. This could be a software issue "
1011 "prior to suspend or a hardware issue.\n");
1012 return res;
1013 }
1014
1015 ieee80211_led_radio(local, true);
1016 ieee80211_mod_tpt_led_trig(local,
1017 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1018
1019 /* add interfaces */
1020 list_for_each_entry(sdata, &local->interfaces, list) {
1021 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1022 sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1023 ieee80211_sdata_running(sdata))
1024 res = drv_add_interface(local, &sdata->vif);
1025 }
1026
1027 /* add STAs back */
1028 mutex_lock(&local->sta_mtx);
1029 list_for_each_entry(sta, &local->sta_list, list) {
1030 if (sta->uploaded) {
1031 sdata = sta->sdata;
1032 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1033 sdata = container_of(sdata->bss,
1034 struct ieee80211_sub_if_data,
1035 u.ap);
1036
1037 memset(&sta->sta.drv_priv, 0, hw->sta_data_size);
1038 WARN_ON(drv_sta_add(local, sdata, &sta->sta));
1039 }
1040 }
1041 mutex_unlock(&local->sta_mtx);
1042
1043 /* reconfigure tx conf */
1044 list_for_each_entry(sdata, &local->interfaces, list) {
1045 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1046 sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1047 !ieee80211_sdata_running(sdata))
1048 continue;
1049
1050 for (i = 0; i < hw->queues; i++)
1051 drv_conf_tx(local, sdata, i, &sdata->tx_conf[i]);
1052 }
1053
1054 /* reconfigure hardware */
1055 ieee80211_hw_config(local, ~0);
1056
1057 ieee80211_configure_filter(local);
1058
1059 /* Finally also reconfigure all the BSS information */
1060 list_for_each_entry(sdata, &local->interfaces, list) {
1061 u32 changed;
1062
1063 if (!ieee80211_sdata_running(sdata))
1064 continue;
1065
1066 /* common change flags for all interface types */
1067 changed = BSS_CHANGED_ERP_CTS_PROT |
1068 BSS_CHANGED_ERP_PREAMBLE |
1069 BSS_CHANGED_ERP_SLOT |
1070 BSS_CHANGED_HT |
1071 BSS_CHANGED_BASIC_RATES |
1072 BSS_CHANGED_BEACON_INT |
1073 BSS_CHANGED_BSSID |
1074 BSS_CHANGED_CQM |
1075 BSS_CHANGED_QOS;
1076
1077 switch (sdata->vif.type) {
1078 case NL80211_IFTYPE_STATION:
1079 changed |= BSS_CHANGED_ASSOC;
1080 mutex_lock(&sdata->u.mgd.mtx);
1081 ieee80211_bss_info_change_notify(sdata, changed);
1082 mutex_unlock(&sdata->u.mgd.mtx);
1083 break;
1084 case NL80211_IFTYPE_ADHOC:
1085 changed |= BSS_CHANGED_IBSS;
1086 /* fall through */
1087 case NL80211_IFTYPE_AP:
1088 changed |= BSS_CHANGED_SSID;
1089 /* fall through */
1090 case NL80211_IFTYPE_MESH_POINT:
1091 changed |= BSS_CHANGED_BEACON |
1092 BSS_CHANGED_BEACON_ENABLED;
1093 ieee80211_bss_info_change_notify(sdata, changed);
1094 break;
1095 case NL80211_IFTYPE_WDS:
1096 break;
1097 case NL80211_IFTYPE_AP_VLAN:
1098 case NL80211_IFTYPE_MONITOR:
1099 /* ignore virtual */
1100 break;
1101 case NL80211_IFTYPE_UNSPECIFIED:
1102 case NUM_NL80211_IFTYPES:
1103 case NL80211_IFTYPE_P2P_CLIENT:
1104 case NL80211_IFTYPE_P2P_GO:
1105 WARN_ON(1);
1106 break;
1107 }
1108 }
1109
1110 /*
1111 * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
1112 * sessions can be established after a resume.
1113 *
1114 * Also tear down aggregation sessions since reconfiguring
1115 * them in a hardware restart scenario is not easily done
1116 * right now, and the hardware will have lost information
1117 * about the sessions, but we and the AP still think they
1118 * are active. This is really a workaround though.
1119 */
1120 if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1121 mutex_lock(&local->sta_mtx);
1122
1123 list_for_each_entry(sta, &local->sta_list, list) {
1124 ieee80211_sta_tear_down_BA_sessions(sta, true);
1125 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
1126 }
1127
1128 mutex_unlock(&local->sta_mtx);
1129 }
1130
1131 /* add back keys */
1132 list_for_each_entry(sdata, &local->interfaces, list)
1133 if (ieee80211_sdata_running(sdata))
1134 ieee80211_enable_keys(sdata);
1135
1136 wake_up:
1137 ieee80211_wake_queues_by_reason(hw,
1138 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1139
1140 /*
1141 * If this is for hw restart things are still running.
1142 * We may want to change that later, however.
1143 */
1144 if (!local->suspended)
1145 return 0;
1146
1147 #ifdef CONFIG_PM
1148 /* first set suspended false, then resuming */
1149 local->suspended = false;
1150 mb();
1151 local->resuming = false;
1152
1153 list_for_each_entry(sdata, &local->interfaces, list) {
1154 switch(sdata->vif.type) {
1155 case NL80211_IFTYPE_STATION:
1156 ieee80211_sta_restart(sdata);
1157 break;
1158 case NL80211_IFTYPE_ADHOC:
1159 ieee80211_ibss_restart(sdata);
1160 break;
1161 case NL80211_IFTYPE_MESH_POINT:
1162 ieee80211_mesh_restart(sdata);
1163 break;
1164 default:
1165 break;
1166 }
1167 }
1168
1169 mod_timer(&local->sta_cleanup, jiffies + 1);
1170
1171 mutex_lock(&local->sta_mtx);
1172 list_for_each_entry(sta, &local->sta_list, list)
1173 mesh_plink_restart(sta);
1174 mutex_unlock(&local->sta_mtx);
1175 #else
1176 WARN_ON(1);
1177 #endif
1178 return 0;
1179 }
1180
1181 void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
1182 {
1183 struct ieee80211_sub_if_data *sdata;
1184 struct ieee80211_local *local;
1185 struct ieee80211_key *key;
1186
1187 if (WARN_ON(!vif))
1188 return;
1189
1190 sdata = vif_to_sdata(vif);
1191 local = sdata->local;
1192
1193 if (WARN_ON(!local->resuming))
1194 return;
1195
1196 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1197 return;
1198
1199 sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;
1200
1201 mutex_lock(&local->key_mtx);
1202 list_for_each_entry(key, &sdata->key_list, list)
1203 key->flags |= KEY_FLAG_TAINTED;
1204 mutex_unlock(&local->key_mtx);
1205 }
1206 EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);
1207
1208 static int check_mgd_smps(struct ieee80211_if_managed *ifmgd,
1209 enum ieee80211_smps_mode *smps_mode)
1210 {
1211 if (ifmgd->associated) {
1212 *smps_mode = ifmgd->ap_smps;
1213
1214 if (*smps_mode == IEEE80211_SMPS_AUTOMATIC) {
1215 if (ifmgd->powersave)
1216 *smps_mode = IEEE80211_SMPS_DYNAMIC;
1217 else
1218 *smps_mode = IEEE80211_SMPS_OFF;
1219 }
1220
1221 return 1;
1222 }
1223
1224 return 0;
1225 }
1226
1227 /* must hold iflist_mtx */
1228 void ieee80211_recalc_smps(struct ieee80211_local *local)
1229 {
1230 struct ieee80211_sub_if_data *sdata;
1231 enum ieee80211_smps_mode smps_mode = IEEE80211_SMPS_OFF;
1232 int count = 0;
1233
1234 lockdep_assert_held(&local->iflist_mtx);
1235
1236 /*
1237 * This function could be improved to handle multiple
1238 * interfaces better, but right now it makes any
1239 * non-station interfaces force SM PS to be turned
1240 * off. If there are multiple station interfaces it
1241 * could also use the best possible mode, e.g. if
1242 * one is in static and the other in dynamic then
1243 * dynamic is ok.
1244 */
1245
1246 list_for_each_entry(sdata, &local->interfaces, list) {
1247 if (!ieee80211_sdata_running(sdata))
1248 continue;
1249 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1250 goto set;
1251
1252 count += check_mgd_smps(&sdata->u.mgd, &smps_mode);
1253
1254 if (count > 1) {
1255 smps_mode = IEEE80211_SMPS_OFF;
1256 break;
1257 }
1258 }
1259
1260 if (smps_mode == local->smps_mode)
1261 return;
1262
1263 set:
1264 local->smps_mode = smps_mode;
1265 /* changed flag is auto-detected for this */
1266 ieee80211_hw_config(local, 0);
1267 }
1268
1269 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1270 {
1271 int i;
1272
1273 for (i = 0; i < n_ids; i++)
1274 if (ids[i] == id)
1275 return true;
1276 return false;
1277 }
1278
1279 /**
1280 * ieee80211_ie_split - split an IE buffer according to ordering
1281 *
1282 * @ies: the IE buffer
1283 * @ielen: the length of the IE buffer
1284 * @ids: an array with element IDs that are allowed before
1285 * the split
1286 * @n_ids: the size of the element ID array
1287 * @offset: offset where to start splitting in the buffer
1288 *
1289 * This function splits an IE buffer by updating the @offset
1290 * variable to point to the location where the buffer should be
1291 * split.
1292 *
1293 * It assumes that the given IE buffer is well-formed, this
1294 * has to be guaranteed by the caller!
1295 *
1296 * It also assumes that the IEs in the buffer are ordered
1297 * correctly, if not the result of using this function will not
1298 * be ordered correctly either, i.e. it does no reordering.
1299 *
1300 * The function returns the offset where the next part of the
1301 * buffer starts, which may be @ielen if the entire (remainder)
1302 * of the buffer should be used.
1303 */
1304 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1305 const u8 *ids, int n_ids, size_t offset)
1306 {
1307 size_t pos = offset;
1308
1309 while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1310 pos += 2 + ies[pos + 1];
1311
1312 return pos;
1313 }
1314
1315 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1316 {
1317 size_t pos = offset;
1318
1319 while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1320 pos += 2 + ies[pos + 1];
1321
1322 return pos;
1323 }
1324
1325 static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
1326 int rssi_min_thold,
1327 int rssi_max_thold)
1328 {
1329 trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);
1330
1331 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1332 return;
1333
1334 /*
1335 * Scale up threshold values before storing it, as the RSSI averaging
1336 * algorithm uses a scaled up value as well. Change this scaling
1337 * factor if the RSSI averaging algorithm changes.
1338 */
1339 sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
1340 sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
1341 }
1342
1343 void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
1344 int rssi_min_thold,
1345 int rssi_max_thold)
1346 {
1347 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1348
1349 WARN_ON(rssi_min_thold == rssi_max_thold ||
1350 rssi_min_thold > rssi_max_thold);
1351
1352 _ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
1353 rssi_max_thold);
1354 }
1355 EXPORT_SYMBOL(ieee80211_enable_rssi_reports);
1356
1357 void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
1358 {
1359 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1360
1361 _ieee80211_enable_rssi_reports(sdata, 0, 0);
1362 }
1363 EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
1364
1365 int ieee80211_add_srates_ie(struct ieee80211_vif *vif, struct sk_buff *skb)
1366 {
1367 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1368 struct ieee80211_local *local = sdata->local;
1369 struct ieee80211_supported_band *sband;
1370 int rate;
1371 u8 i, rates, *pos;
1372
1373 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1374 rates = sband->n_bitrates;
1375 if (rates > 8)
1376 rates = 8;
1377
1378 if (skb_tailroom(skb) < rates + 2)
1379 return -ENOMEM;
1380
1381 pos = skb_put(skb, rates + 2);
1382 *pos++ = WLAN_EID_SUPP_RATES;
1383 *pos++ = rates;
1384 for (i = 0; i < rates; i++) {
1385 rate = sband->bitrates[i].bitrate;
1386 *pos++ = (u8) (rate / 5);
1387 }
1388
1389 return 0;
1390 }
1391
1392 int ieee80211_add_ext_srates_ie(struct ieee80211_vif *vif, struct sk_buff *skb)
1393 {
1394 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1395 struct ieee80211_local *local = sdata->local;
1396 struct ieee80211_supported_band *sband;
1397 int rate;
1398 u8 i, exrates, *pos;
1399
1400 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1401 exrates = sband->n_bitrates;
1402 if (exrates > 8)
1403 exrates -= 8;
1404 else
1405 exrates = 0;
1406
1407 if (skb_tailroom(skb) < exrates + 2)
1408 return -ENOMEM;
1409
1410 if (exrates) {
1411 pos = skb_put(skb, exrates + 2);
1412 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1413 *pos++ = exrates;
1414 for (i = 8; i < sband->n_bitrates; i++) {
1415 rate = sband->bitrates[i].bitrate;
1416 *pos++ = (u8) (rate / 5);
1417 }
1418 }
1419 return 0;
1420 }
kernel source for telekom puls (alcatel/mediatek)