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Merge tag 'h8300-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck...
[deliverable/linux.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/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(enum ieee80211_band band, size_t len,
110 int rate, int erp, int short_preamble,
111 int shift)
112 {
113 int dur;
114
115 /* calculate duration (in microseconds, rounded up to next higher
116 * integer if it includes a fractional microsecond) to send frame of
117 * len bytes (does not include FCS) at the given rate. Duration will
118 * also include SIFS.
119 *
120 * rate is in 100 kbps, so divident is multiplied by 10 in the
121 * DIV_ROUND_UP() operations.
122 *
123 * shift may be 2 for 5 MHz channels or 1 for 10 MHz channels, and
124 * is assumed to be 0 otherwise.
125 */
126
127 if (band == IEEE80211_BAND_5GHZ || erp) {
128 /*
129 * OFDM:
130 *
131 * N_DBPS = DATARATE x 4
132 * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
133 * (16 = SIGNAL time, 6 = tail bits)
134 * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
135 *
136 * T_SYM = 4 usec
137 * 802.11a - 18.5.2: aSIFSTime = 16 usec
138 * 802.11g - 19.8.4: aSIFSTime = 10 usec +
139 * signal ext = 6 usec
140 */
141 dur = 16; /* SIFS + signal ext */
142 dur += 16; /* IEEE 802.11-2012 18.3.2.4: T_PREAMBLE = 16 usec */
143 dur += 4; /* IEEE 802.11-2012 18.3.2.4: T_SIGNAL = 4 usec */
144
145 /* IEEE 802.11-2012 18.3.2.4: all values above are:
146 * * times 4 for 5 MHz
147 * * times 2 for 10 MHz
148 */
149 dur *= 1 << shift;
150
151 /* rates should already consider the channel bandwidth,
152 * don't apply divisor again.
153 */
154 dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
155 4 * rate); /* T_SYM x N_SYM */
156 } else {
157 /*
158 * 802.11b or 802.11g with 802.11b compatibility:
159 * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
160 * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
161 *
162 * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
163 * aSIFSTime = 10 usec
164 * aPreambleLength = 144 usec or 72 usec with short preamble
165 * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
166 */
167 dur = 10; /* aSIFSTime = 10 usec */
168 dur += short_preamble ? (72 + 24) : (144 + 48);
169
170 dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
171 }
172
173 return dur;
174 }
175
176 /* Exported duration function for driver use */
177 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
178 struct ieee80211_vif *vif,
179 enum ieee80211_band band,
180 size_t frame_len,
181 struct ieee80211_rate *rate)
182 {
183 struct ieee80211_sub_if_data *sdata;
184 u16 dur;
185 int erp, shift = 0;
186 bool short_preamble = false;
187
188 erp = 0;
189 if (vif) {
190 sdata = vif_to_sdata(vif);
191 short_preamble = sdata->vif.bss_conf.use_short_preamble;
192 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
193 erp = rate->flags & IEEE80211_RATE_ERP_G;
194 shift = ieee80211_vif_get_shift(vif);
195 }
196
197 dur = ieee80211_frame_duration(band, frame_len, rate->bitrate, erp,
198 short_preamble, shift);
199
200 return cpu_to_le16(dur);
201 }
202 EXPORT_SYMBOL(ieee80211_generic_frame_duration);
203
204 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
205 struct ieee80211_vif *vif, size_t frame_len,
206 const struct ieee80211_tx_info *frame_txctl)
207 {
208 struct ieee80211_local *local = hw_to_local(hw);
209 struct ieee80211_rate *rate;
210 struct ieee80211_sub_if_data *sdata;
211 bool short_preamble;
212 int erp, shift = 0, bitrate;
213 u16 dur;
214 struct ieee80211_supported_band *sband;
215
216 sband = local->hw.wiphy->bands[frame_txctl->band];
217
218 short_preamble = false;
219
220 rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
221
222 erp = 0;
223 if (vif) {
224 sdata = vif_to_sdata(vif);
225 short_preamble = sdata->vif.bss_conf.use_short_preamble;
226 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
227 erp = rate->flags & IEEE80211_RATE_ERP_G;
228 shift = ieee80211_vif_get_shift(vif);
229 }
230
231 bitrate = DIV_ROUND_UP(rate->bitrate, 1 << shift);
232
233 /* CTS duration */
234 dur = ieee80211_frame_duration(sband->band, 10, bitrate,
235 erp, short_preamble, shift);
236 /* Data frame duration */
237 dur += ieee80211_frame_duration(sband->band, frame_len, bitrate,
238 erp, short_preamble, shift);
239 /* ACK duration */
240 dur += ieee80211_frame_duration(sband->band, 10, bitrate,
241 erp, short_preamble, shift);
242
243 return cpu_to_le16(dur);
244 }
245 EXPORT_SYMBOL(ieee80211_rts_duration);
246
247 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
248 struct ieee80211_vif *vif,
249 size_t frame_len,
250 const struct ieee80211_tx_info *frame_txctl)
251 {
252 struct ieee80211_local *local = hw_to_local(hw);
253 struct ieee80211_rate *rate;
254 struct ieee80211_sub_if_data *sdata;
255 bool short_preamble;
256 int erp, shift = 0, bitrate;
257 u16 dur;
258 struct ieee80211_supported_band *sband;
259
260 sband = local->hw.wiphy->bands[frame_txctl->band];
261
262 short_preamble = false;
263
264 rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
265 erp = 0;
266 if (vif) {
267 sdata = vif_to_sdata(vif);
268 short_preamble = sdata->vif.bss_conf.use_short_preamble;
269 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
270 erp = rate->flags & IEEE80211_RATE_ERP_G;
271 shift = ieee80211_vif_get_shift(vif);
272 }
273
274 bitrate = DIV_ROUND_UP(rate->bitrate, 1 << shift);
275
276 /* Data frame duration */
277 dur = ieee80211_frame_duration(sband->band, frame_len, bitrate,
278 erp, short_preamble, shift);
279 if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
280 /* ACK duration */
281 dur += ieee80211_frame_duration(sband->band, 10, bitrate,
282 erp, short_preamble, shift);
283 }
284
285 return cpu_to_le16(dur);
286 }
287 EXPORT_SYMBOL(ieee80211_ctstoself_duration);
288
289 void ieee80211_propagate_queue_wake(struct ieee80211_local *local, int queue)
290 {
291 struct ieee80211_sub_if_data *sdata;
292 int n_acs = IEEE80211_NUM_ACS;
293
294 if (local->hw.queues < IEEE80211_NUM_ACS)
295 n_acs = 1;
296
297 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
298 int ac;
299
300 if (!sdata->dev)
301 continue;
302
303 if (test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))
304 continue;
305
306 if (sdata->vif.cab_queue != IEEE80211_INVAL_HW_QUEUE &&
307 local->queue_stop_reasons[sdata->vif.cab_queue] != 0)
308 continue;
309
310 for (ac = 0; ac < n_acs; ac++) {
311 int ac_queue = sdata->vif.hw_queue[ac];
312
313 if (ac_queue == queue ||
314 (sdata->vif.cab_queue == queue &&
315 local->queue_stop_reasons[ac_queue] == 0 &&
316 skb_queue_empty(&local->pending[ac_queue])))
317 netif_wake_subqueue(sdata->dev, ac);
318 }
319 }
320 }
321
322 static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
323 enum queue_stop_reason reason)
324 {
325 struct ieee80211_local *local = hw_to_local(hw);
326
327 trace_wake_queue(local, queue, reason);
328
329 if (WARN_ON(queue >= hw->queues))
330 return;
331
332 if (!test_bit(reason, &local->queue_stop_reasons[queue]))
333 return;
334
335 __clear_bit(reason, &local->queue_stop_reasons[queue]);
336
337 if (local->queue_stop_reasons[queue] != 0)
338 /* someone still has this queue stopped */
339 return;
340
341 if (skb_queue_empty(&local->pending[queue])) {
342 rcu_read_lock();
343 ieee80211_propagate_queue_wake(local, queue);
344 rcu_read_unlock();
345 } else
346 tasklet_schedule(&local->tx_pending_tasklet);
347 }
348
349 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
350 enum queue_stop_reason reason)
351 {
352 struct ieee80211_local *local = hw_to_local(hw);
353 unsigned long flags;
354
355 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
356 __ieee80211_wake_queue(hw, queue, reason);
357 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
358 }
359
360 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
361 {
362 ieee80211_wake_queue_by_reason(hw, queue,
363 IEEE80211_QUEUE_STOP_REASON_DRIVER);
364 }
365 EXPORT_SYMBOL(ieee80211_wake_queue);
366
367 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
368 enum queue_stop_reason reason)
369 {
370 struct ieee80211_local *local = hw_to_local(hw);
371 struct ieee80211_sub_if_data *sdata;
372 int n_acs = IEEE80211_NUM_ACS;
373
374 trace_stop_queue(local, queue, reason);
375
376 if (WARN_ON(queue >= hw->queues))
377 return;
378
379 if (test_bit(reason, &local->queue_stop_reasons[queue]))
380 return;
381
382 __set_bit(reason, &local->queue_stop_reasons[queue]);
383
384 if (local->hw.queues < IEEE80211_NUM_ACS)
385 n_acs = 1;
386
387 rcu_read_lock();
388 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
389 int ac;
390
391 if (!sdata->dev)
392 continue;
393
394 for (ac = 0; ac < n_acs; ac++) {
395 if (sdata->vif.hw_queue[ac] == queue ||
396 sdata->vif.cab_queue == queue)
397 netif_stop_subqueue(sdata->dev, ac);
398 }
399 }
400 rcu_read_unlock();
401 }
402
403 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
404 enum queue_stop_reason reason)
405 {
406 struct ieee80211_local *local = hw_to_local(hw);
407 unsigned long flags;
408
409 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
410 __ieee80211_stop_queue(hw, queue, reason);
411 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
412 }
413
414 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
415 {
416 ieee80211_stop_queue_by_reason(hw, queue,
417 IEEE80211_QUEUE_STOP_REASON_DRIVER);
418 }
419 EXPORT_SYMBOL(ieee80211_stop_queue);
420
421 void ieee80211_add_pending_skb(struct ieee80211_local *local,
422 struct sk_buff *skb)
423 {
424 struct ieee80211_hw *hw = &local->hw;
425 unsigned long flags;
426 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
427 int queue = info->hw_queue;
428
429 if (WARN_ON(!info->control.vif)) {
430 ieee80211_free_txskb(&local->hw, skb);
431 return;
432 }
433
434 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
435 __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
436 __skb_queue_tail(&local->pending[queue], skb);
437 __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
438 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
439 }
440
441 void ieee80211_add_pending_skbs_fn(struct ieee80211_local *local,
442 struct sk_buff_head *skbs,
443 void (*fn)(void *data), void *data)
444 {
445 struct ieee80211_hw *hw = &local->hw;
446 struct sk_buff *skb;
447 unsigned long flags;
448 int queue, i;
449
450 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
451 while ((skb = skb_dequeue(skbs))) {
452 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
453
454 if (WARN_ON(!info->control.vif)) {
455 ieee80211_free_txskb(&local->hw, skb);
456 continue;
457 }
458
459 queue = info->hw_queue;
460
461 __ieee80211_stop_queue(hw, queue,
462 IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
463
464 __skb_queue_tail(&local->pending[queue], skb);
465 }
466
467 if (fn)
468 fn(data);
469
470 for (i = 0; i < hw->queues; i++)
471 __ieee80211_wake_queue(hw, i,
472 IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
473 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
474 }
475
476 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
477 unsigned long queues,
478 enum queue_stop_reason reason)
479 {
480 struct ieee80211_local *local = hw_to_local(hw);
481 unsigned long flags;
482 int i;
483
484 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
485
486 for_each_set_bit(i, &queues, hw->queues)
487 __ieee80211_stop_queue(hw, i, reason);
488
489 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
490 }
491
492 void ieee80211_stop_queues(struct ieee80211_hw *hw)
493 {
494 ieee80211_stop_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
495 IEEE80211_QUEUE_STOP_REASON_DRIVER);
496 }
497 EXPORT_SYMBOL(ieee80211_stop_queues);
498
499 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
500 {
501 struct ieee80211_local *local = hw_to_local(hw);
502 unsigned long flags;
503 int ret;
504
505 if (WARN_ON(queue >= hw->queues))
506 return true;
507
508 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
509 ret = test_bit(IEEE80211_QUEUE_STOP_REASON_DRIVER,
510 &local->queue_stop_reasons[queue]);
511 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
512 return ret;
513 }
514 EXPORT_SYMBOL(ieee80211_queue_stopped);
515
516 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
517 unsigned long queues,
518 enum queue_stop_reason reason)
519 {
520 struct ieee80211_local *local = hw_to_local(hw);
521 unsigned long flags;
522 int i;
523
524 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
525
526 for_each_set_bit(i, &queues, hw->queues)
527 __ieee80211_wake_queue(hw, i, reason);
528
529 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
530 }
531
532 void ieee80211_wake_queues(struct ieee80211_hw *hw)
533 {
534 ieee80211_wake_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
535 IEEE80211_QUEUE_STOP_REASON_DRIVER);
536 }
537 EXPORT_SYMBOL(ieee80211_wake_queues);
538
539 void ieee80211_flush_queues(struct ieee80211_local *local,
540 struct ieee80211_sub_if_data *sdata)
541 {
542 u32 queues;
543
544 if (!local->ops->flush)
545 return;
546
547 if (sdata && local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) {
548 int ac;
549
550 queues = 0;
551
552 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++)
553 queues |= BIT(sdata->vif.hw_queue[ac]);
554 if (sdata->vif.cab_queue != IEEE80211_INVAL_HW_QUEUE)
555 queues |= BIT(sdata->vif.cab_queue);
556 } else {
557 /* all queues */
558 queues = BIT(local->hw.queues) - 1;
559 }
560
561 ieee80211_stop_queues_by_reason(&local->hw, IEEE80211_MAX_QUEUE_MAP,
562 IEEE80211_QUEUE_STOP_REASON_FLUSH);
563
564 drv_flush(local, queues, false);
565
566 ieee80211_wake_queues_by_reason(&local->hw, IEEE80211_MAX_QUEUE_MAP,
567 IEEE80211_QUEUE_STOP_REASON_FLUSH);
568 }
569
570 void ieee80211_iterate_active_interfaces(
571 struct ieee80211_hw *hw, u32 iter_flags,
572 void (*iterator)(void *data, u8 *mac,
573 struct ieee80211_vif *vif),
574 void *data)
575 {
576 struct ieee80211_local *local = hw_to_local(hw);
577 struct ieee80211_sub_if_data *sdata;
578
579 mutex_lock(&local->iflist_mtx);
580
581 list_for_each_entry(sdata, &local->interfaces, list) {
582 switch (sdata->vif.type) {
583 case NL80211_IFTYPE_MONITOR:
584 if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
585 continue;
586 break;
587 case NL80211_IFTYPE_AP_VLAN:
588 continue;
589 default:
590 break;
591 }
592 if (!(iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL) &&
593 !(sdata->flags & IEEE80211_SDATA_IN_DRIVER))
594 continue;
595 if (ieee80211_sdata_running(sdata))
596 iterator(data, sdata->vif.addr,
597 &sdata->vif);
598 }
599
600 sdata = rcu_dereference_protected(local->monitor_sdata,
601 lockdep_is_held(&local->iflist_mtx));
602 if (sdata &&
603 (iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL ||
604 sdata->flags & IEEE80211_SDATA_IN_DRIVER))
605 iterator(data, sdata->vif.addr, &sdata->vif);
606
607 mutex_unlock(&local->iflist_mtx);
608 }
609 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
610
611 void ieee80211_iterate_active_interfaces_atomic(
612 struct ieee80211_hw *hw, u32 iter_flags,
613 void (*iterator)(void *data, u8 *mac,
614 struct ieee80211_vif *vif),
615 void *data)
616 {
617 struct ieee80211_local *local = hw_to_local(hw);
618 struct ieee80211_sub_if_data *sdata;
619
620 rcu_read_lock();
621
622 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
623 switch (sdata->vif.type) {
624 case NL80211_IFTYPE_MONITOR:
625 if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
626 continue;
627 break;
628 case NL80211_IFTYPE_AP_VLAN:
629 continue;
630 default:
631 break;
632 }
633 if (!(iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL) &&
634 !(sdata->flags & IEEE80211_SDATA_IN_DRIVER))
635 continue;
636 if (ieee80211_sdata_running(sdata))
637 iterator(data, sdata->vif.addr,
638 &sdata->vif);
639 }
640
641 sdata = rcu_dereference(local->monitor_sdata);
642 if (sdata &&
643 (iter_flags & IEEE80211_IFACE_ITER_RESUME_ALL ||
644 sdata->flags & IEEE80211_SDATA_IN_DRIVER))
645 iterator(data, sdata->vif.addr, &sdata->vif);
646
647 rcu_read_unlock();
648 }
649 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
650
651 /*
652 * Nothing should have been stuffed into the workqueue during
653 * the suspend->resume cycle. If this WARN is seen then there
654 * is a bug with either the driver suspend or something in
655 * mac80211 stuffing into the workqueue which we haven't yet
656 * cleared during mac80211's suspend cycle.
657 */
658 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
659 {
660 if (WARN(local->suspended && !local->resuming,
661 "queueing ieee80211 work while going to suspend\n"))
662 return false;
663
664 return true;
665 }
666
667 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
668 {
669 struct ieee80211_local *local = hw_to_local(hw);
670
671 if (!ieee80211_can_queue_work(local))
672 return;
673
674 queue_work(local->workqueue, work);
675 }
676 EXPORT_SYMBOL(ieee80211_queue_work);
677
678 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
679 struct delayed_work *dwork,
680 unsigned long delay)
681 {
682 struct ieee80211_local *local = hw_to_local(hw);
683
684 if (!ieee80211_can_queue_work(local))
685 return;
686
687 queue_delayed_work(local->workqueue, dwork, delay);
688 }
689 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
690
691 u32 ieee802_11_parse_elems_crc(const u8 *start, size_t len, bool action,
692 struct ieee802_11_elems *elems,
693 u64 filter, u32 crc)
694 {
695 size_t left = len;
696 const u8 *pos = start;
697 bool calc_crc = filter != 0;
698 DECLARE_BITMAP(seen_elems, 256);
699 const u8 *ie;
700
701 bitmap_zero(seen_elems, 256);
702 memset(elems, 0, sizeof(*elems));
703 elems->ie_start = start;
704 elems->total_len = len;
705
706 while (left >= 2) {
707 u8 id, elen;
708 bool elem_parse_failed;
709
710 id = *pos++;
711 elen = *pos++;
712 left -= 2;
713
714 if (elen > left) {
715 elems->parse_error = true;
716 break;
717 }
718
719 switch (id) {
720 case WLAN_EID_SSID:
721 case WLAN_EID_SUPP_RATES:
722 case WLAN_EID_FH_PARAMS:
723 case WLAN_EID_DS_PARAMS:
724 case WLAN_EID_CF_PARAMS:
725 case WLAN_EID_TIM:
726 case WLAN_EID_IBSS_PARAMS:
727 case WLAN_EID_CHALLENGE:
728 case WLAN_EID_RSN:
729 case WLAN_EID_ERP_INFO:
730 case WLAN_EID_EXT_SUPP_RATES:
731 case WLAN_EID_HT_CAPABILITY:
732 case WLAN_EID_HT_OPERATION:
733 case WLAN_EID_VHT_CAPABILITY:
734 case WLAN_EID_VHT_OPERATION:
735 case WLAN_EID_MESH_ID:
736 case WLAN_EID_MESH_CONFIG:
737 case WLAN_EID_PEER_MGMT:
738 case WLAN_EID_PREQ:
739 case WLAN_EID_PREP:
740 case WLAN_EID_PERR:
741 case WLAN_EID_RANN:
742 case WLAN_EID_CHANNEL_SWITCH:
743 case WLAN_EID_EXT_CHANSWITCH_ANN:
744 case WLAN_EID_COUNTRY:
745 case WLAN_EID_PWR_CONSTRAINT:
746 case WLAN_EID_TIMEOUT_INTERVAL:
747 case WLAN_EID_SECONDARY_CHANNEL_OFFSET:
748 case WLAN_EID_WIDE_BW_CHANNEL_SWITCH:
749 /*
750 * not listing WLAN_EID_CHANNEL_SWITCH_WRAPPER -- it seems possible
751 * that if the content gets bigger it might be needed more than once
752 */
753 if (test_bit(id, seen_elems)) {
754 elems->parse_error = true;
755 left -= elen;
756 pos += elen;
757 continue;
758 }
759 break;
760 }
761
762 if (calc_crc && id < 64 && (filter & (1ULL << id)))
763 crc = crc32_be(crc, pos - 2, elen + 2);
764
765 elem_parse_failed = false;
766
767 switch (id) {
768 case WLAN_EID_SSID:
769 elems->ssid = pos;
770 elems->ssid_len = elen;
771 break;
772 case WLAN_EID_SUPP_RATES:
773 elems->supp_rates = pos;
774 elems->supp_rates_len = elen;
775 break;
776 case WLAN_EID_DS_PARAMS:
777 if (elen >= 1)
778 elems->ds_params = pos;
779 else
780 elem_parse_failed = true;
781 break;
782 case WLAN_EID_TIM:
783 if (elen >= sizeof(struct ieee80211_tim_ie)) {
784 elems->tim = (void *)pos;
785 elems->tim_len = elen;
786 } else
787 elem_parse_failed = true;
788 break;
789 case WLAN_EID_CHALLENGE:
790 elems->challenge = pos;
791 elems->challenge_len = elen;
792 break;
793 case WLAN_EID_VENDOR_SPECIFIC:
794 if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
795 pos[2] == 0xf2) {
796 /* Microsoft OUI (00:50:F2) */
797
798 if (calc_crc)
799 crc = crc32_be(crc, pos - 2, elen + 2);
800
801 if (elen >= 5 && pos[3] == 2) {
802 /* OUI Type 2 - WMM IE */
803 if (pos[4] == 0) {
804 elems->wmm_info = pos;
805 elems->wmm_info_len = elen;
806 } else if (pos[4] == 1) {
807 elems->wmm_param = pos;
808 elems->wmm_param_len = elen;
809 }
810 }
811 }
812 break;
813 case WLAN_EID_RSN:
814 elems->rsn = pos;
815 elems->rsn_len = elen;
816 break;
817 case WLAN_EID_ERP_INFO:
818 if (elen >= 1)
819 elems->erp_info = pos;
820 else
821 elem_parse_failed = true;
822 break;
823 case WLAN_EID_EXT_SUPP_RATES:
824 elems->ext_supp_rates = pos;
825 elems->ext_supp_rates_len = elen;
826 break;
827 case WLAN_EID_HT_CAPABILITY:
828 if (elen >= sizeof(struct ieee80211_ht_cap))
829 elems->ht_cap_elem = (void *)pos;
830 else
831 elem_parse_failed = true;
832 break;
833 case WLAN_EID_HT_OPERATION:
834 if (elen >= sizeof(struct ieee80211_ht_operation))
835 elems->ht_operation = (void *)pos;
836 else
837 elem_parse_failed = true;
838 break;
839 case WLAN_EID_VHT_CAPABILITY:
840 if (elen >= sizeof(struct ieee80211_vht_cap))
841 elems->vht_cap_elem = (void *)pos;
842 else
843 elem_parse_failed = true;
844 break;
845 case WLAN_EID_VHT_OPERATION:
846 if (elen >= sizeof(struct ieee80211_vht_operation))
847 elems->vht_operation = (void *)pos;
848 else
849 elem_parse_failed = true;
850 break;
851 case WLAN_EID_OPMODE_NOTIF:
852 if (elen > 0)
853 elems->opmode_notif = pos;
854 else
855 elem_parse_failed = true;
856 break;
857 case WLAN_EID_MESH_ID:
858 elems->mesh_id = pos;
859 elems->mesh_id_len = elen;
860 break;
861 case WLAN_EID_MESH_CONFIG:
862 if (elen >= sizeof(struct ieee80211_meshconf_ie))
863 elems->mesh_config = (void *)pos;
864 else
865 elem_parse_failed = true;
866 break;
867 case WLAN_EID_PEER_MGMT:
868 elems->peering = pos;
869 elems->peering_len = elen;
870 break;
871 case WLAN_EID_MESH_AWAKE_WINDOW:
872 if (elen >= 2)
873 elems->awake_window = (void *)pos;
874 break;
875 case WLAN_EID_PREQ:
876 elems->preq = pos;
877 elems->preq_len = elen;
878 break;
879 case WLAN_EID_PREP:
880 elems->prep = pos;
881 elems->prep_len = elen;
882 break;
883 case WLAN_EID_PERR:
884 elems->perr = pos;
885 elems->perr_len = elen;
886 break;
887 case WLAN_EID_RANN:
888 if (elen >= sizeof(struct ieee80211_rann_ie))
889 elems->rann = (void *)pos;
890 else
891 elem_parse_failed = true;
892 break;
893 case WLAN_EID_CHANNEL_SWITCH:
894 if (elen != sizeof(struct ieee80211_channel_sw_ie)) {
895 elem_parse_failed = true;
896 break;
897 }
898 elems->ch_switch_ie = (void *)pos;
899 break;
900 case WLAN_EID_EXT_CHANSWITCH_ANN:
901 if (elen != sizeof(struct ieee80211_ext_chansw_ie)) {
902 elem_parse_failed = true;
903 break;
904 }
905 elems->ext_chansw_ie = (void *)pos;
906 break;
907 case WLAN_EID_SECONDARY_CHANNEL_OFFSET:
908 if (elen != sizeof(struct ieee80211_sec_chan_offs_ie)) {
909 elem_parse_failed = true;
910 break;
911 }
912 elems->sec_chan_offs = (void *)pos;
913 break;
914 case WLAN_EID_WIDE_BW_CHANNEL_SWITCH:
915 if (!action ||
916 elen != sizeof(*elems->wide_bw_chansw_ie)) {
917 elem_parse_failed = true;
918 break;
919 }
920 elems->wide_bw_chansw_ie = (void *)pos;
921 break;
922 case WLAN_EID_CHANNEL_SWITCH_WRAPPER:
923 if (action) {
924 elem_parse_failed = true;
925 break;
926 }
927 /*
928 * This is a bit tricky, but as we only care about
929 * the wide bandwidth channel switch element, so
930 * just parse it out manually.
931 */
932 ie = cfg80211_find_ie(WLAN_EID_WIDE_BW_CHANNEL_SWITCH,
933 pos, elen);
934 if (ie) {
935 if (ie[1] == sizeof(*elems->wide_bw_chansw_ie))
936 elems->wide_bw_chansw_ie =
937 (void *)(ie + 2);
938 else
939 elem_parse_failed = true;
940 }
941 break;
942 case WLAN_EID_COUNTRY:
943 elems->country_elem = pos;
944 elems->country_elem_len = elen;
945 break;
946 case WLAN_EID_PWR_CONSTRAINT:
947 if (elen != 1) {
948 elem_parse_failed = true;
949 break;
950 }
951 elems->pwr_constr_elem = pos;
952 break;
953 case WLAN_EID_TIMEOUT_INTERVAL:
954 if (elen >= sizeof(struct ieee80211_timeout_interval_ie))
955 elems->timeout_int = (void *)pos;
956 else
957 elem_parse_failed = true;
958 break;
959 default:
960 break;
961 }
962
963 if (elem_parse_failed)
964 elems->parse_error = true;
965 else
966 __set_bit(id, seen_elems);
967
968 left -= elen;
969 pos += elen;
970 }
971
972 if (left != 0)
973 elems->parse_error = true;
974
975 return crc;
976 }
977
978 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata,
979 bool bss_notify)
980 {
981 struct ieee80211_local *local = sdata->local;
982 struct ieee80211_tx_queue_params qparam;
983 struct ieee80211_chanctx_conf *chanctx_conf;
984 int ac;
985 bool use_11b, enable_qos;
986 int aCWmin, aCWmax;
987
988 if (!local->ops->conf_tx)
989 return;
990
991 if (local->hw.queues < IEEE80211_NUM_ACS)
992 return;
993
994 memset(&qparam, 0, sizeof(qparam));
995
996 rcu_read_lock();
997 chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
998 use_11b = (chanctx_conf &&
999 chanctx_conf->def.chan->band == IEEE80211_BAND_2GHZ) &&
1000 !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
1001 rcu_read_unlock();
1002
1003 /*
1004 * By default disable QoS in STA mode for old access points, which do
1005 * not support 802.11e. New APs will provide proper queue parameters,
1006 * that we will configure later.
1007 */
1008 enable_qos = (sdata->vif.type != NL80211_IFTYPE_STATION);
1009
1010 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
1011 /* Set defaults according to 802.11-2007 Table 7-37 */
1012 aCWmax = 1023;
1013 if (use_11b)
1014 aCWmin = 31;
1015 else
1016 aCWmin = 15;
1017
1018 if (enable_qos) {
1019 switch (ac) {
1020 case IEEE80211_AC_BK:
1021 qparam.cw_max = aCWmax;
1022 qparam.cw_min = aCWmin;
1023 qparam.txop = 0;
1024 qparam.aifs = 7;
1025 break;
1026 /* never happens but let's not leave undefined */
1027 default:
1028 case IEEE80211_AC_BE:
1029 qparam.cw_max = aCWmax;
1030 qparam.cw_min = aCWmin;
1031 qparam.txop = 0;
1032 qparam.aifs = 3;
1033 break;
1034 case IEEE80211_AC_VI:
1035 qparam.cw_max = aCWmin;
1036 qparam.cw_min = (aCWmin + 1) / 2 - 1;
1037 if (use_11b)
1038 qparam.txop = 6016/32;
1039 else
1040 qparam.txop = 3008/32;
1041 qparam.aifs = 2;
1042 break;
1043 case IEEE80211_AC_VO:
1044 qparam.cw_max = (aCWmin + 1) / 2 - 1;
1045 qparam.cw_min = (aCWmin + 1) / 4 - 1;
1046 if (use_11b)
1047 qparam.txop = 3264/32;
1048 else
1049 qparam.txop = 1504/32;
1050 qparam.aifs = 2;
1051 break;
1052 }
1053 } else {
1054 /* Confiure old 802.11b/g medium access rules. */
1055 qparam.cw_max = aCWmax;
1056 qparam.cw_min = aCWmin;
1057 qparam.txop = 0;
1058 qparam.aifs = 2;
1059 }
1060
1061 qparam.uapsd = false;
1062
1063 sdata->tx_conf[ac] = qparam;
1064 drv_conf_tx(local, sdata, ac, &qparam);
1065 }
1066
1067 if (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1068 sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
1069 sdata->vif.bss_conf.qos = enable_qos;
1070 if (bss_notify)
1071 ieee80211_bss_info_change_notify(sdata,
1072 BSS_CHANGED_QOS);
1073 }
1074 }
1075
1076 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
1077 u16 transaction, u16 auth_alg, u16 status,
1078 const u8 *extra, size_t extra_len, const u8 *da,
1079 const u8 *bssid, const u8 *key, u8 key_len, u8 key_idx,
1080 u32 tx_flags)
1081 {
1082 struct ieee80211_local *local = sdata->local;
1083 struct sk_buff *skb;
1084 struct ieee80211_mgmt *mgmt;
1085 int err;
1086
1087 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
1088 sizeof(*mgmt) + 6 + extra_len);
1089 if (!skb)
1090 return;
1091
1092 skb_reserve(skb, local->hw.extra_tx_headroom);
1093
1094 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
1095 memset(mgmt, 0, 24 + 6);
1096 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
1097 IEEE80211_STYPE_AUTH);
1098 memcpy(mgmt->da, da, ETH_ALEN);
1099 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1100 memcpy(mgmt->bssid, bssid, ETH_ALEN);
1101 mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
1102 mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
1103 mgmt->u.auth.status_code = cpu_to_le16(status);
1104 if (extra)
1105 memcpy(skb_put(skb, extra_len), extra, extra_len);
1106
1107 if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
1108 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
1109 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
1110 WARN_ON(err);
1111 }
1112
1113 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
1114 tx_flags;
1115 ieee80211_tx_skb(sdata, skb);
1116 }
1117
1118 void ieee80211_send_deauth_disassoc(struct ieee80211_sub_if_data *sdata,
1119 const u8 *bssid, u16 stype, u16 reason,
1120 bool send_frame, u8 *frame_buf)
1121 {
1122 struct ieee80211_local *local = sdata->local;
1123 struct sk_buff *skb;
1124 struct ieee80211_mgmt *mgmt = (void *)frame_buf;
1125
1126 /* build frame */
1127 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT | stype);
1128 mgmt->duration = 0; /* initialize only */
1129 mgmt->seq_ctrl = 0; /* initialize only */
1130 memcpy(mgmt->da, bssid, ETH_ALEN);
1131 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
1132 memcpy(mgmt->bssid, bssid, ETH_ALEN);
1133 /* u.deauth.reason_code == u.disassoc.reason_code */
1134 mgmt->u.deauth.reason_code = cpu_to_le16(reason);
1135
1136 if (send_frame) {
1137 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
1138 IEEE80211_DEAUTH_FRAME_LEN);
1139 if (!skb)
1140 return;
1141
1142 skb_reserve(skb, local->hw.extra_tx_headroom);
1143
1144 /* copy in frame */
1145 memcpy(skb_put(skb, IEEE80211_DEAUTH_FRAME_LEN),
1146 mgmt, IEEE80211_DEAUTH_FRAME_LEN);
1147
1148 if (sdata->vif.type != NL80211_IFTYPE_STATION ||
1149 !(sdata->u.mgd.flags & IEEE80211_STA_MFP_ENABLED))
1150 IEEE80211_SKB_CB(skb)->flags |=
1151 IEEE80211_TX_INTFL_DONT_ENCRYPT;
1152
1153 ieee80211_tx_skb(sdata, skb);
1154 }
1155 }
1156
1157 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
1158 size_t buffer_len, const u8 *ie, size_t ie_len,
1159 enum ieee80211_band band, u32 rate_mask,
1160 struct cfg80211_chan_def *chandef)
1161 {
1162 struct ieee80211_supported_band *sband;
1163 u8 *pos = buffer, *end = buffer + buffer_len;
1164 size_t offset = 0, noffset;
1165 int supp_rates_len, i;
1166 u8 rates[32];
1167 int num_rates;
1168 int ext_rates_len;
1169 int shift;
1170 u32 rate_flags;
1171
1172 sband = local->hw.wiphy->bands[band];
1173 if (WARN_ON_ONCE(!sband))
1174 return 0;
1175
1176 rate_flags = ieee80211_chandef_rate_flags(chandef);
1177 shift = ieee80211_chandef_get_shift(chandef);
1178
1179 num_rates = 0;
1180 for (i = 0; i < sband->n_bitrates; i++) {
1181 if ((BIT(i) & rate_mask) == 0)
1182 continue; /* skip rate */
1183 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
1184 continue;
1185
1186 rates[num_rates++] =
1187 (u8) DIV_ROUND_UP(sband->bitrates[i].bitrate,
1188 (1 << shift) * 5);
1189 }
1190
1191 supp_rates_len = min_t(int, num_rates, 8);
1192
1193 if (end - pos < 2 + supp_rates_len)
1194 goto out_err;
1195 *pos++ = WLAN_EID_SUPP_RATES;
1196 *pos++ = supp_rates_len;
1197 memcpy(pos, rates, supp_rates_len);
1198 pos += supp_rates_len;
1199
1200 /* insert "request information" if in custom IEs */
1201 if (ie && ie_len) {
1202 static const u8 before_extrates[] = {
1203 WLAN_EID_SSID,
1204 WLAN_EID_SUPP_RATES,
1205 WLAN_EID_REQUEST,
1206 };
1207 noffset = ieee80211_ie_split(ie, ie_len,
1208 before_extrates,
1209 ARRAY_SIZE(before_extrates),
1210 offset);
1211 if (end - pos < noffset - offset)
1212 goto out_err;
1213 memcpy(pos, ie + offset, noffset - offset);
1214 pos += noffset - offset;
1215 offset = noffset;
1216 }
1217
1218 ext_rates_len = num_rates - supp_rates_len;
1219 if (ext_rates_len > 0) {
1220 if (end - pos < 2 + ext_rates_len)
1221 goto out_err;
1222 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1223 *pos++ = ext_rates_len;
1224 memcpy(pos, rates + supp_rates_len, ext_rates_len);
1225 pos += ext_rates_len;
1226 }
1227
1228 if (chandef->chan && sband->band == IEEE80211_BAND_2GHZ) {
1229 if (end - pos < 3)
1230 goto out_err;
1231 *pos++ = WLAN_EID_DS_PARAMS;
1232 *pos++ = 1;
1233 *pos++ = ieee80211_frequency_to_channel(
1234 chandef->chan->center_freq);
1235 }
1236
1237 /* insert custom IEs that go before HT */
1238 if (ie && ie_len) {
1239 static const u8 before_ht[] = {
1240 WLAN_EID_SSID,
1241 WLAN_EID_SUPP_RATES,
1242 WLAN_EID_REQUEST,
1243 WLAN_EID_EXT_SUPP_RATES,
1244 WLAN_EID_DS_PARAMS,
1245 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1246 };
1247 noffset = ieee80211_ie_split(ie, ie_len,
1248 before_ht, ARRAY_SIZE(before_ht),
1249 offset);
1250 if (end - pos < noffset - offset)
1251 goto out_err;
1252 memcpy(pos, ie + offset, noffset - offset);
1253 pos += noffset - offset;
1254 offset = noffset;
1255 }
1256
1257 if (sband->ht_cap.ht_supported) {
1258 if (end - pos < 2 + sizeof(struct ieee80211_ht_cap))
1259 goto out_err;
1260 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
1261 sband->ht_cap.cap);
1262 }
1263
1264 /*
1265 * If adding more here, adjust code in main.c
1266 * that calculates local->scan_ies_len.
1267 */
1268
1269 /* add any remaining custom IEs */
1270 if (ie && ie_len) {
1271 noffset = ie_len;
1272 if (end - pos < noffset - offset)
1273 goto out_err;
1274 memcpy(pos, ie + offset, noffset - offset);
1275 pos += noffset - offset;
1276 }
1277
1278 if (sband->vht_cap.vht_supported) {
1279 if (end - pos < 2 + sizeof(struct ieee80211_vht_cap))
1280 goto out_err;
1281 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
1282 sband->vht_cap.cap);
1283 }
1284
1285 return pos - buffer;
1286 out_err:
1287 WARN_ONCE(1, "not enough space for preq IEs\n");
1288 return pos - buffer;
1289 }
1290
1291 struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
1292 u8 *dst, u32 ratemask,
1293 struct ieee80211_channel *chan,
1294 const u8 *ssid, size_t ssid_len,
1295 const u8 *ie, size_t ie_len,
1296 bool directed)
1297 {
1298 struct ieee80211_local *local = sdata->local;
1299 struct cfg80211_chan_def chandef;
1300 struct sk_buff *skb;
1301 struct ieee80211_mgmt *mgmt;
1302 int ies_len;
1303
1304 /*
1305 * Do not send DS Channel parameter for directed probe requests
1306 * in order to maximize the chance that we get a response. Some
1307 * badly-behaved APs don't respond when this parameter is included.
1308 */
1309 chandef.width = sdata->vif.bss_conf.chandef.width;
1310 if (directed)
1311 chandef.chan = NULL;
1312 else
1313 chandef.chan = chan;
1314
1315 skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
1316 ssid, ssid_len, 100 + ie_len);
1317 if (!skb)
1318 return NULL;
1319
1320 ies_len = ieee80211_build_preq_ies(local, skb_tail_pointer(skb),
1321 skb_tailroom(skb),
1322 ie, ie_len, chan->band,
1323 ratemask, &chandef);
1324 skb_put(skb, ies_len);
1325
1326 if (dst) {
1327 mgmt = (struct ieee80211_mgmt *) skb->data;
1328 memcpy(mgmt->da, dst, ETH_ALEN);
1329 memcpy(mgmt->bssid, dst, ETH_ALEN);
1330 }
1331
1332 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1333
1334 return skb;
1335 }
1336
1337 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1338 const u8 *ssid, size_t ssid_len,
1339 const u8 *ie, size_t ie_len,
1340 u32 ratemask, bool directed, u32 tx_flags,
1341 struct ieee80211_channel *channel, bool scan)
1342 {
1343 struct sk_buff *skb;
1344
1345 skb = ieee80211_build_probe_req(sdata, dst, ratemask, channel,
1346 ssid, ssid_len,
1347 ie, ie_len, directed);
1348 if (skb) {
1349 IEEE80211_SKB_CB(skb)->flags |= tx_flags;
1350 if (scan)
1351 ieee80211_tx_skb_tid_band(sdata, skb, 7, channel->band);
1352 else
1353 ieee80211_tx_skb(sdata, skb);
1354 }
1355 }
1356
1357 u32 ieee80211_sta_get_rates(struct ieee80211_sub_if_data *sdata,
1358 struct ieee802_11_elems *elems,
1359 enum ieee80211_band band, u32 *basic_rates)
1360 {
1361 struct ieee80211_supported_band *sband;
1362 struct ieee80211_rate *bitrates;
1363 size_t num_rates;
1364 u32 supp_rates, rate_flags;
1365 int i, j, shift;
1366 sband = sdata->local->hw.wiphy->bands[band];
1367
1368 rate_flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
1369 shift = ieee80211_vif_get_shift(&sdata->vif);
1370
1371 if (WARN_ON(!sband))
1372 return 1;
1373
1374 bitrates = sband->bitrates;
1375 num_rates = sband->n_bitrates;
1376 supp_rates = 0;
1377 for (i = 0; i < elems->supp_rates_len +
1378 elems->ext_supp_rates_len; i++) {
1379 u8 rate = 0;
1380 int own_rate;
1381 bool is_basic;
1382 if (i < elems->supp_rates_len)
1383 rate = elems->supp_rates[i];
1384 else if (elems->ext_supp_rates)
1385 rate = elems->ext_supp_rates
1386 [i - elems->supp_rates_len];
1387 own_rate = 5 * (rate & 0x7f);
1388 is_basic = !!(rate & 0x80);
1389
1390 if (is_basic && (rate & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1391 continue;
1392
1393 for (j = 0; j < num_rates; j++) {
1394 int brate;
1395 if ((rate_flags & sband->bitrates[j].flags)
1396 != rate_flags)
1397 continue;
1398
1399 brate = DIV_ROUND_UP(sband->bitrates[j].bitrate,
1400 1 << shift);
1401
1402 if (brate == own_rate) {
1403 supp_rates |= BIT(j);
1404 if (basic_rates && is_basic)
1405 *basic_rates |= BIT(j);
1406 }
1407 }
1408 }
1409 return supp_rates;
1410 }
1411
1412 void ieee80211_stop_device(struct ieee80211_local *local)
1413 {
1414 ieee80211_led_radio(local, false);
1415 ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
1416
1417 cancel_work_sync(&local->reconfig_filter);
1418
1419 flush_workqueue(local->workqueue);
1420 drv_stop(local);
1421 }
1422
1423 static void ieee80211_assign_chanctx(struct ieee80211_local *local,
1424 struct ieee80211_sub_if_data *sdata)
1425 {
1426 struct ieee80211_chanctx_conf *conf;
1427 struct ieee80211_chanctx *ctx;
1428
1429 if (!local->use_chanctx)
1430 return;
1431
1432 mutex_lock(&local->chanctx_mtx);
1433 conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1434 lockdep_is_held(&local->chanctx_mtx));
1435 if (conf) {
1436 ctx = container_of(conf, struct ieee80211_chanctx, conf);
1437 drv_assign_vif_chanctx(local, sdata, ctx);
1438 }
1439 mutex_unlock(&local->chanctx_mtx);
1440 }
1441
1442 int ieee80211_reconfig(struct ieee80211_local *local)
1443 {
1444 struct ieee80211_hw *hw = &local->hw;
1445 struct ieee80211_sub_if_data *sdata;
1446 struct ieee80211_chanctx *ctx;
1447 struct sta_info *sta;
1448 int res, i;
1449 bool reconfig_due_to_wowlan = false;
1450
1451 #ifdef CONFIG_PM
1452 if (local->suspended)
1453 local->resuming = true;
1454
1455 if (local->wowlan) {
1456 res = drv_resume(local);
1457 local->wowlan = false;
1458 if (res < 0) {
1459 local->resuming = false;
1460 return res;
1461 }
1462 if (res == 0)
1463 goto wake_up;
1464 WARN_ON(res > 1);
1465 /*
1466 * res is 1, which means the driver requested
1467 * to go through a regular reset on wakeup.
1468 */
1469 reconfig_due_to_wowlan = true;
1470 }
1471 #endif
1472 /* everything else happens only if HW was up & running */
1473 if (!local->open_count)
1474 goto wake_up;
1475
1476 /*
1477 * Upon resume hardware can sometimes be goofy due to
1478 * various platform / driver / bus issues, so restarting
1479 * the device may at times not work immediately. Propagate
1480 * the error.
1481 */
1482 res = drv_start(local);
1483 if (res) {
1484 WARN(local->suspended, "Hardware became unavailable "
1485 "upon resume. This could be a software issue "
1486 "prior to suspend or a hardware issue.\n");
1487 return res;
1488 }
1489
1490 /* setup fragmentation threshold */
1491 drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
1492
1493 /* setup RTS threshold */
1494 drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1495
1496 /* reset coverage class */
1497 drv_set_coverage_class(local, hw->wiphy->coverage_class);
1498
1499 ieee80211_led_radio(local, true);
1500 ieee80211_mod_tpt_led_trig(local,
1501 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1502
1503 /* add interfaces */
1504 sdata = rtnl_dereference(local->monitor_sdata);
1505 if (sdata) {
1506 /* in HW restart it exists already */
1507 WARN_ON(local->resuming);
1508 res = drv_add_interface(local, sdata);
1509 if (WARN_ON(res)) {
1510 rcu_assign_pointer(local->monitor_sdata, NULL);
1511 synchronize_net();
1512 kfree(sdata);
1513 }
1514 }
1515
1516 list_for_each_entry(sdata, &local->interfaces, list) {
1517 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1518 sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1519 ieee80211_sdata_running(sdata))
1520 res = drv_add_interface(local, sdata);
1521 }
1522
1523 /* add channel contexts */
1524 if (local->use_chanctx) {
1525 mutex_lock(&local->chanctx_mtx);
1526 list_for_each_entry(ctx, &local->chanctx_list, list)
1527 WARN_ON(drv_add_chanctx(local, ctx));
1528 mutex_unlock(&local->chanctx_mtx);
1529 }
1530
1531 list_for_each_entry(sdata, &local->interfaces, list) {
1532 if (!ieee80211_sdata_running(sdata))
1533 continue;
1534 ieee80211_assign_chanctx(local, sdata);
1535 }
1536
1537 sdata = rtnl_dereference(local->monitor_sdata);
1538 if (sdata && ieee80211_sdata_running(sdata))
1539 ieee80211_assign_chanctx(local, sdata);
1540
1541 /* add STAs back */
1542 mutex_lock(&local->sta_mtx);
1543 list_for_each_entry(sta, &local->sta_list, list) {
1544 enum ieee80211_sta_state state;
1545
1546 if (!sta->uploaded)
1547 continue;
1548
1549 /* AP-mode stations will be added later */
1550 if (sta->sdata->vif.type == NL80211_IFTYPE_AP)
1551 continue;
1552
1553 for (state = IEEE80211_STA_NOTEXIST;
1554 state < sta->sta_state; state++)
1555 WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1556 state + 1));
1557 }
1558 mutex_unlock(&local->sta_mtx);
1559
1560 /* reconfigure tx conf */
1561 if (hw->queues >= IEEE80211_NUM_ACS) {
1562 list_for_each_entry(sdata, &local->interfaces, list) {
1563 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1564 sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1565 !ieee80211_sdata_running(sdata))
1566 continue;
1567
1568 for (i = 0; i < IEEE80211_NUM_ACS; i++)
1569 drv_conf_tx(local, sdata, i,
1570 &sdata->tx_conf[i]);
1571 }
1572 }
1573
1574 /* reconfigure hardware */
1575 ieee80211_hw_config(local, ~0);
1576
1577 ieee80211_configure_filter(local);
1578
1579 /* Finally also reconfigure all the BSS information */
1580 list_for_each_entry(sdata, &local->interfaces, list) {
1581 u32 changed;
1582
1583 if (!ieee80211_sdata_running(sdata))
1584 continue;
1585
1586 /* common change flags for all interface types */
1587 changed = BSS_CHANGED_ERP_CTS_PROT |
1588 BSS_CHANGED_ERP_PREAMBLE |
1589 BSS_CHANGED_ERP_SLOT |
1590 BSS_CHANGED_HT |
1591 BSS_CHANGED_BASIC_RATES |
1592 BSS_CHANGED_BEACON_INT |
1593 BSS_CHANGED_BSSID |
1594 BSS_CHANGED_CQM |
1595 BSS_CHANGED_QOS |
1596 BSS_CHANGED_IDLE |
1597 BSS_CHANGED_TXPOWER;
1598
1599 switch (sdata->vif.type) {
1600 case NL80211_IFTYPE_STATION:
1601 changed |= BSS_CHANGED_ASSOC |
1602 BSS_CHANGED_ARP_FILTER |
1603 BSS_CHANGED_PS;
1604
1605 /* Re-send beacon info report to the driver */
1606 if (sdata->u.mgd.have_beacon)
1607 changed |= BSS_CHANGED_BEACON_INFO;
1608
1609 sdata_lock(sdata);
1610 ieee80211_bss_info_change_notify(sdata, changed);
1611 sdata_unlock(sdata);
1612 break;
1613 case NL80211_IFTYPE_ADHOC:
1614 changed |= BSS_CHANGED_IBSS;
1615 /* fall through */
1616 case NL80211_IFTYPE_AP:
1617 changed |= BSS_CHANGED_SSID | BSS_CHANGED_P2P_PS;
1618
1619 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1620 changed |= BSS_CHANGED_AP_PROBE_RESP;
1621
1622 if (rcu_access_pointer(sdata->u.ap.beacon))
1623 drv_start_ap(local, sdata);
1624 }
1625
1626 /* fall through */
1627 case NL80211_IFTYPE_MESH_POINT:
1628 if (sdata->vif.bss_conf.enable_beacon) {
1629 changed |= BSS_CHANGED_BEACON |
1630 BSS_CHANGED_BEACON_ENABLED;
1631 ieee80211_bss_info_change_notify(sdata, changed);
1632 }
1633 break;
1634 case NL80211_IFTYPE_WDS:
1635 break;
1636 case NL80211_IFTYPE_AP_VLAN:
1637 case NL80211_IFTYPE_MONITOR:
1638 /* ignore virtual */
1639 break;
1640 case NL80211_IFTYPE_P2P_DEVICE:
1641 changed = BSS_CHANGED_IDLE;
1642 break;
1643 case NL80211_IFTYPE_UNSPECIFIED:
1644 case NUM_NL80211_IFTYPES:
1645 case NL80211_IFTYPE_P2P_CLIENT:
1646 case NL80211_IFTYPE_P2P_GO:
1647 WARN_ON(1);
1648 break;
1649 }
1650 }
1651
1652 ieee80211_recalc_ps(local, -1);
1653
1654 /*
1655 * The sta might be in psm against the ap (e.g. because
1656 * this was the state before a hw restart), so we
1657 * explicitly send a null packet in order to make sure
1658 * it'll sync against the ap (and get out of psm).
1659 */
1660 if (!(local->hw.conf.flags & IEEE80211_CONF_PS)) {
1661 list_for_each_entry(sdata, &local->interfaces, list) {
1662 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1663 continue;
1664 if (!sdata->u.mgd.associated)
1665 continue;
1666
1667 ieee80211_send_nullfunc(local, sdata, 0);
1668 }
1669 }
1670
1671 /* APs are now beaconing, add back stations */
1672 mutex_lock(&local->sta_mtx);
1673 list_for_each_entry(sta, &local->sta_list, list) {
1674 enum ieee80211_sta_state state;
1675
1676 if (!sta->uploaded)
1677 continue;
1678
1679 if (sta->sdata->vif.type != NL80211_IFTYPE_AP)
1680 continue;
1681
1682 for (state = IEEE80211_STA_NOTEXIST;
1683 state < sta->sta_state; state++)
1684 WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1685 state + 1));
1686 }
1687 mutex_unlock(&local->sta_mtx);
1688
1689 /* add back keys */
1690 list_for_each_entry(sdata, &local->interfaces, list)
1691 if (ieee80211_sdata_running(sdata))
1692 ieee80211_enable_keys(sdata);
1693
1694 wake_up:
1695 local->in_reconfig = false;
1696 barrier();
1697
1698 if (local->monitors == local->open_count && local->monitors > 0)
1699 ieee80211_add_virtual_monitor(local);
1700
1701 /*
1702 * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
1703 * sessions can be established after a resume.
1704 *
1705 * Also tear down aggregation sessions since reconfiguring
1706 * them in a hardware restart scenario is not easily done
1707 * right now, and the hardware will have lost information
1708 * about the sessions, but we and the AP still think they
1709 * are active. This is really a workaround though.
1710 */
1711 if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1712 mutex_lock(&local->sta_mtx);
1713
1714 list_for_each_entry(sta, &local->sta_list, list) {
1715 ieee80211_sta_tear_down_BA_sessions(
1716 sta, AGG_STOP_LOCAL_REQUEST);
1717 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
1718 }
1719
1720 mutex_unlock(&local->sta_mtx);
1721 }
1722
1723 ieee80211_wake_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
1724 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1725
1726 /*
1727 * If this is for hw restart things are still running.
1728 * We may want to change that later, however.
1729 */
1730 if (!local->suspended || reconfig_due_to_wowlan)
1731 drv_restart_complete(local);
1732
1733 if (!local->suspended)
1734 return 0;
1735
1736 #ifdef CONFIG_PM
1737 /* first set suspended false, then resuming */
1738 local->suspended = false;
1739 mb();
1740 local->resuming = false;
1741
1742 list_for_each_entry(sdata, &local->interfaces, list) {
1743 if (!ieee80211_sdata_running(sdata))
1744 continue;
1745 if (sdata->vif.type == NL80211_IFTYPE_STATION)
1746 ieee80211_sta_restart(sdata);
1747 }
1748
1749 mod_timer(&local->sta_cleanup, jiffies + 1);
1750 #else
1751 WARN_ON(1);
1752 #endif
1753 return 0;
1754 }
1755
1756 void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
1757 {
1758 struct ieee80211_sub_if_data *sdata;
1759 struct ieee80211_local *local;
1760 struct ieee80211_key *key;
1761
1762 if (WARN_ON(!vif))
1763 return;
1764
1765 sdata = vif_to_sdata(vif);
1766 local = sdata->local;
1767
1768 if (WARN_ON(!local->resuming))
1769 return;
1770
1771 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1772 return;
1773
1774 sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;
1775
1776 mutex_lock(&local->key_mtx);
1777 list_for_each_entry(key, &sdata->key_list, list)
1778 key->flags |= KEY_FLAG_TAINTED;
1779 mutex_unlock(&local->key_mtx);
1780 }
1781 EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);
1782
1783 void ieee80211_recalc_smps(struct ieee80211_sub_if_data *sdata)
1784 {
1785 struct ieee80211_local *local = sdata->local;
1786 struct ieee80211_chanctx_conf *chanctx_conf;
1787 struct ieee80211_chanctx *chanctx;
1788
1789 mutex_lock(&local->chanctx_mtx);
1790
1791 chanctx_conf = rcu_dereference_protected(sdata->vif.chanctx_conf,
1792 lockdep_is_held(&local->chanctx_mtx));
1793
1794 if (WARN_ON_ONCE(!chanctx_conf))
1795 goto unlock;
1796
1797 chanctx = container_of(chanctx_conf, struct ieee80211_chanctx, conf);
1798 ieee80211_recalc_smps_chanctx(local, chanctx);
1799 unlock:
1800 mutex_unlock(&local->chanctx_mtx);
1801 }
1802
1803 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1804 {
1805 int i;
1806
1807 for (i = 0; i < n_ids; i++)
1808 if (ids[i] == id)
1809 return true;
1810 return false;
1811 }
1812
1813 /**
1814 * ieee80211_ie_split - split an IE buffer according to ordering
1815 *
1816 * @ies: the IE buffer
1817 * @ielen: the length of the IE buffer
1818 * @ids: an array with element IDs that are allowed before
1819 * the split
1820 * @n_ids: the size of the element ID array
1821 * @offset: offset where to start splitting in the buffer
1822 *
1823 * This function splits an IE buffer by updating the @offset
1824 * variable to point to the location where the buffer should be
1825 * split.
1826 *
1827 * It assumes that the given IE buffer is well-formed, this
1828 * has to be guaranteed by the caller!
1829 *
1830 * It also assumes that the IEs in the buffer are ordered
1831 * correctly, if not the result of using this function will not
1832 * be ordered correctly either, i.e. it does no reordering.
1833 *
1834 * The function returns the offset where the next part of the
1835 * buffer starts, which may be @ielen if the entire (remainder)
1836 * of the buffer should be used.
1837 */
1838 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1839 const u8 *ids, int n_ids, size_t offset)
1840 {
1841 size_t pos = offset;
1842
1843 while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1844 pos += 2 + ies[pos + 1];
1845
1846 return pos;
1847 }
1848
1849 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1850 {
1851 size_t pos = offset;
1852
1853 while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1854 pos += 2 + ies[pos + 1];
1855
1856 return pos;
1857 }
1858
1859 static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
1860 int rssi_min_thold,
1861 int rssi_max_thold)
1862 {
1863 trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);
1864
1865 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1866 return;
1867
1868 /*
1869 * Scale up threshold values before storing it, as the RSSI averaging
1870 * algorithm uses a scaled up value as well. Change this scaling
1871 * factor if the RSSI averaging algorithm changes.
1872 */
1873 sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
1874 sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
1875 }
1876
1877 void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
1878 int rssi_min_thold,
1879 int rssi_max_thold)
1880 {
1881 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1882
1883 WARN_ON(rssi_min_thold == rssi_max_thold ||
1884 rssi_min_thold > rssi_max_thold);
1885
1886 _ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
1887 rssi_max_thold);
1888 }
1889 EXPORT_SYMBOL(ieee80211_enable_rssi_reports);
1890
1891 void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
1892 {
1893 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1894
1895 _ieee80211_enable_rssi_reports(sdata, 0, 0);
1896 }
1897 EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
1898
1899 u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1900 u16 cap)
1901 {
1902 __le16 tmp;
1903
1904 *pos++ = WLAN_EID_HT_CAPABILITY;
1905 *pos++ = sizeof(struct ieee80211_ht_cap);
1906 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
1907
1908 /* capability flags */
1909 tmp = cpu_to_le16(cap);
1910 memcpy(pos, &tmp, sizeof(u16));
1911 pos += sizeof(u16);
1912
1913 /* AMPDU parameters */
1914 *pos++ = ht_cap->ampdu_factor |
1915 (ht_cap->ampdu_density <<
1916 IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
1917
1918 /* MCS set */
1919 memcpy(pos, &ht_cap->mcs, sizeof(ht_cap->mcs));
1920 pos += sizeof(ht_cap->mcs);
1921
1922 /* extended capabilities */
1923 pos += sizeof(__le16);
1924
1925 /* BF capabilities */
1926 pos += sizeof(__le32);
1927
1928 /* antenna selection */
1929 pos += sizeof(u8);
1930
1931 return pos;
1932 }
1933
1934 u8 *ieee80211_ie_build_vht_cap(u8 *pos, struct ieee80211_sta_vht_cap *vht_cap,
1935 u32 cap)
1936 {
1937 __le32 tmp;
1938
1939 *pos++ = WLAN_EID_VHT_CAPABILITY;
1940 *pos++ = sizeof(struct ieee80211_vht_cap);
1941 memset(pos, 0, sizeof(struct ieee80211_vht_cap));
1942
1943 /* capability flags */
1944 tmp = cpu_to_le32(cap);
1945 memcpy(pos, &tmp, sizeof(u32));
1946 pos += sizeof(u32);
1947
1948 /* VHT MCS set */
1949 memcpy(pos, &vht_cap->vht_mcs, sizeof(vht_cap->vht_mcs));
1950 pos += sizeof(vht_cap->vht_mcs);
1951
1952 return pos;
1953 }
1954
1955 u8 *ieee80211_ie_build_ht_oper(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1956 const struct cfg80211_chan_def *chandef,
1957 u16 prot_mode)
1958 {
1959 struct ieee80211_ht_operation *ht_oper;
1960 /* Build HT Information */
1961 *pos++ = WLAN_EID_HT_OPERATION;
1962 *pos++ = sizeof(struct ieee80211_ht_operation);
1963 ht_oper = (struct ieee80211_ht_operation *)pos;
1964 ht_oper->primary_chan = ieee80211_frequency_to_channel(
1965 chandef->chan->center_freq);
1966 switch (chandef->width) {
1967 case NL80211_CHAN_WIDTH_160:
1968 case NL80211_CHAN_WIDTH_80P80:
1969 case NL80211_CHAN_WIDTH_80:
1970 case NL80211_CHAN_WIDTH_40:
1971 if (chandef->center_freq1 > chandef->chan->center_freq)
1972 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
1973 else
1974 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1975 break;
1976 default:
1977 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
1978 break;
1979 }
1980 if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
1981 chandef->width != NL80211_CHAN_WIDTH_20_NOHT &&
1982 chandef->width != NL80211_CHAN_WIDTH_20)
1983 ht_oper->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
1984
1985 ht_oper->operation_mode = cpu_to_le16(prot_mode);
1986 ht_oper->stbc_param = 0x0000;
1987
1988 /* It seems that Basic MCS set and Supported MCS set
1989 are identical for the first 10 bytes */
1990 memset(&ht_oper->basic_set, 0, 16);
1991 memcpy(&ht_oper->basic_set, &ht_cap->mcs, 10);
1992
1993 return pos + sizeof(struct ieee80211_ht_operation);
1994 }
1995
1996 void ieee80211_ht_oper_to_chandef(struct ieee80211_channel *control_chan,
1997 const struct ieee80211_ht_operation *ht_oper,
1998 struct cfg80211_chan_def *chandef)
1999 {
2000 enum nl80211_channel_type channel_type;
2001
2002 if (!ht_oper) {
2003 cfg80211_chandef_create(chandef, control_chan,
2004 NL80211_CHAN_NO_HT);
2005 return;
2006 }
2007
2008 switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
2009 case IEEE80211_HT_PARAM_CHA_SEC_NONE:
2010 channel_type = NL80211_CHAN_HT20;
2011 break;
2012 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
2013 channel_type = NL80211_CHAN_HT40PLUS;
2014 break;
2015 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
2016 channel_type = NL80211_CHAN_HT40MINUS;
2017 break;
2018 default:
2019 channel_type = NL80211_CHAN_NO_HT;
2020 }
2021
2022 cfg80211_chandef_create(chandef, control_chan, channel_type);
2023 }
2024
2025 int ieee80211_parse_bitrates(struct cfg80211_chan_def *chandef,
2026 const struct ieee80211_supported_band *sband,
2027 const u8 *srates, int srates_len, u32 *rates)
2028 {
2029 u32 rate_flags = ieee80211_chandef_rate_flags(chandef);
2030 int shift = ieee80211_chandef_get_shift(chandef);
2031 struct ieee80211_rate *br;
2032 int brate, rate, i, j, count = 0;
2033
2034 *rates = 0;
2035
2036 for (i = 0; i < srates_len; i++) {
2037 rate = srates[i] & 0x7f;
2038
2039 for (j = 0; j < sband->n_bitrates; j++) {
2040 br = &sband->bitrates[j];
2041 if ((rate_flags & br->flags) != rate_flags)
2042 continue;
2043
2044 brate = DIV_ROUND_UP(br->bitrate, (1 << shift) * 5);
2045 if (brate == rate) {
2046 *rates |= BIT(j);
2047 count++;
2048 break;
2049 }
2050 }
2051 }
2052 return count;
2053 }
2054
2055 int ieee80211_add_srates_ie(struct ieee80211_sub_if_data *sdata,
2056 struct sk_buff *skb, bool need_basic,
2057 enum ieee80211_band band)
2058 {
2059 struct ieee80211_local *local = sdata->local;
2060 struct ieee80211_supported_band *sband;
2061 int rate, shift;
2062 u8 i, rates, *pos;
2063 u32 basic_rates = sdata->vif.bss_conf.basic_rates;
2064 u32 rate_flags;
2065
2066 shift = ieee80211_vif_get_shift(&sdata->vif);
2067 rate_flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
2068 sband = local->hw.wiphy->bands[band];
2069 rates = 0;
2070 for (i = 0; i < sband->n_bitrates; i++) {
2071 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
2072 continue;
2073 rates++;
2074 }
2075 if (rates > 8)
2076 rates = 8;
2077
2078 if (skb_tailroom(skb) < rates + 2)
2079 return -ENOMEM;
2080
2081 pos = skb_put(skb, rates + 2);
2082 *pos++ = WLAN_EID_SUPP_RATES;
2083 *pos++ = rates;
2084 for (i = 0; i < rates; i++) {
2085 u8 basic = 0;
2086 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
2087 continue;
2088
2089 if (need_basic && basic_rates & BIT(i))
2090 basic = 0x80;
2091 rate = sband->bitrates[i].bitrate;
2092 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
2093 5 * (1 << shift));
2094 *pos++ = basic | (u8) rate;
2095 }
2096
2097 return 0;
2098 }
2099
2100 int ieee80211_add_ext_srates_ie(struct ieee80211_sub_if_data *sdata,
2101 struct sk_buff *skb, bool need_basic,
2102 enum ieee80211_band band)
2103 {
2104 struct ieee80211_local *local = sdata->local;
2105 struct ieee80211_supported_band *sband;
2106 int rate, shift;
2107 u8 i, exrates, *pos;
2108 u32 basic_rates = sdata->vif.bss_conf.basic_rates;
2109 u32 rate_flags;
2110
2111 rate_flags = ieee80211_chandef_rate_flags(&sdata->vif.bss_conf.chandef);
2112 shift = ieee80211_vif_get_shift(&sdata->vif);
2113
2114 sband = local->hw.wiphy->bands[band];
2115 exrates = 0;
2116 for (i = 0; i < sband->n_bitrates; i++) {
2117 if ((rate_flags & sband->bitrates[i].flags) != rate_flags)
2118 continue;
2119 exrates++;
2120 }
2121
2122 if (exrates > 8)
2123 exrates -= 8;
2124 else
2125 exrates = 0;
2126
2127 if (skb_tailroom(skb) < exrates + 2)
2128 return -ENOMEM;
2129
2130 if (exrates) {
2131 pos = skb_put(skb, exrates + 2);
2132 *pos++ = WLAN_EID_EXT_SUPP_RATES;
2133 *pos++ = exrates;
2134 for (i = 8; i < sband->n_bitrates; i++) {
2135 u8 basic = 0;
2136 if ((rate_flags & sband->bitrates[i].flags)
2137 != rate_flags)
2138 continue;
2139 if (need_basic && basic_rates & BIT(i))
2140 basic = 0x80;
2141 rate = DIV_ROUND_UP(sband->bitrates[i].bitrate,
2142 5 * (1 << shift));
2143 *pos++ = basic | (u8) rate;
2144 }
2145 }
2146 return 0;
2147 }
2148
2149 int ieee80211_ave_rssi(struct ieee80211_vif *vif)
2150 {
2151 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
2152 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
2153
2154 if (WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_STATION)) {
2155 /* non-managed type inferfaces */
2156 return 0;
2157 }
2158 return ifmgd->ave_beacon_signal / 16;
2159 }
2160 EXPORT_SYMBOL_GPL(ieee80211_ave_rssi);
2161
2162 u8 ieee80211_mcs_to_chains(const struct ieee80211_mcs_info *mcs)
2163 {
2164 if (!mcs)
2165 return 1;
2166
2167 /* TODO: consider rx_highest */
2168
2169 if (mcs->rx_mask[3])
2170 return 4;
2171 if (mcs->rx_mask[2])
2172 return 3;
2173 if (mcs->rx_mask[1])
2174 return 2;
2175 return 1;
2176 }
2177
2178 /**
2179 * ieee80211_calculate_rx_timestamp - calculate timestamp in frame
2180 * @local: mac80211 hw info struct
2181 * @status: RX status
2182 * @mpdu_len: total MPDU length (including FCS)
2183 * @mpdu_offset: offset into MPDU to calculate timestamp at
2184 *
2185 * This function calculates the RX timestamp at the given MPDU offset, taking
2186 * into account what the RX timestamp was. An offset of 0 will just normalize
2187 * the timestamp to TSF at beginning of MPDU reception.
2188 */
2189 u64 ieee80211_calculate_rx_timestamp(struct ieee80211_local *local,
2190 struct ieee80211_rx_status *status,
2191 unsigned int mpdu_len,
2192 unsigned int mpdu_offset)
2193 {
2194 u64 ts = status->mactime;
2195 struct rate_info ri;
2196 u16 rate;
2197
2198 if (WARN_ON(!ieee80211_have_rx_timestamp(status)))
2199 return 0;
2200
2201 memset(&ri, 0, sizeof(ri));
2202
2203 /* Fill cfg80211 rate info */
2204 if (status->flag & RX_FLAG_HT) {
2205 ri.mcs = status->rate_idx;
2206 ri.flags |= RATE_INFO_FLAGS_MCS;
2207 if (status->flag & RX_FLAG_40MHZ)
2208 ri.flags |= RATE_INFO_FLAGS_40_MHZ_WIDTH;
2209 if (status->flag & RX_FLAG_SHORT_GI)
2210 ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
2211 } else if (status->flag & RX_FLAG_VHT) {
2212 ri.flags |= RATE_INFO_FLAGS_VHT_MCS;
2213 ri.mcs = status->rate_idx;
2214 ri.nss = status->vht_nss;
2215 if (status->flag & RX_FLAG_40MHZ)
2216 ri.flags |= RATE_INFO_FLAGS_40_MHZ_WIDTH;
2217 if (status->flag & RX_FLAG_80MHZ)
2218 ri.flags |= RATE_INFO_FLAGS_80_MHZ_WIDTH;
2219 if (status->flag & RX_FLAG_80P80MHZ)
2220 ri.flags |= RATE_INFO_FLAGS_80P80_MHZ_WIDTH;
2221 if (status->flag & RX_FLAG_160MHZ)
2222 ri.flags |= RATE_INFO_FLAGS_160_MHZ_WIDTH;
2223 if (status->flag & RX_FLAG_SHORT_GI)
2224 ri.flags |= RATE_INFO_FLAGS_SHORT_GI;
2225 } else {
2226 struct ieee80211_supported_band *sband;
2227 int shift = 0;
2228 int bitrate;
2229
2230 if (status->flag & RX_FLAG_10MHZ)
2231 shift = 1;
2232 if (status->flag & RX_FLAG_5MHZ)
2233 shift = 2;
2234
2235 sband = local->hw.wiphy->bands[status->band];
2236 bitrate = sband->bitrates[status->rate_idx].bitrate;
2237 ri.legacy = DIV_ROUND_UP(bitrate, (1 << shift));
2238 }
2239
2240 rate = cfg80211_calculate_bitrate(&ri);
2241 if (WARN_ONCE(!rate,
2242 "Invalid bitrate: flags=0x%x, idx=%d, vht_nss=%d\n",
2243 status->flag, status->rate_idx, status->vht_nss))
2244 return 0;
2245
2246 /* rewind from end of MPDU */
2247 if (status->flag & RX_FLAG_MACTIME_END)
2248 ts -= mpdu_len * 8 * 10 / rate;
2249
2250 ts += mpdu_offset * 8 * 10 / rate;
2251
2252 return ts;
2253 }
2254
2255 void ieee80211_dfs_cac_cancel(struct ieee80211_local *local)
2256 {
2257 struct ieee80211_sub_if_data *sdata;
2258
2259 mutex_lock(&local->iflist_mtx);
2260 list_for_each_entry(sdata, &local->interfaces, list) {
2261 cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
2262
2263 if (sdata->wdev.cac_started) {
2264 ieee80211_vif_release_channel(sdata);
2265 cfg80211_cac_event(sdata->dev,
2266 NL80211_RADAR_CAC_ABORTED,
2267 GFP_KERNEL);
2268 }
2269 }
2270 mutex_unlock(&local->iflist_mtx);
2271 }
2272
2273 void ieee80211_dfs_radar_detected_work(struct work_struct *work)
2274 {
2275 struct ieee80211_local *local =
2276 container_of(work, struct ieee80211_local, radar_detected_work);
2277 struct cfg80211_chan_def chandef;
2278
2279 ieee80211_dfs_cac_cancel(local);
2280
2281 if (local->use_chanctx)
2282 /* currently not handled */
2283 WARN_ON(1);
2284 else {
2285 chandef = local->hw.conf.chandef;
2286 cfg80211_radar_event(local->hw.wiphy, &chandef, GFP_KERNEL);
2287 }
2288 }
2289
2290 void ieee80211_radar_detected(struct ieee80211_hw *hw)
2291 {
2292 struct ieee80211_local *local = hw_to_local(hw);
2293
2294 trace_api_radar_detected(local);
2295
2296 ieee80211_queue_work(hw, &local->radar_detected_work);
2297 }
2298 EXPORT_SYMBOL(ieee80211_radar_detected);
Linux kernel - Deliverables
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