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mac80211: fix current vs. operating channel in preq/beacon
[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 {
112 int dur;
113
114 /* calculate duration (in microseconds, rounded up to next higher
115 * integer if it includes a fractional microsecond) to send frame of
116 * len bytes (does not include FCS) at the given rate. Duration will
117 * also include SIFS.
118 *
119 * rate is in 100 kbps, so divident is multiplied by 10 in the
120 * DIV_ROUND_UP() operations.
121 */
122
123 if (band == IEEE80211_BAND_5GHZ || erp) {
124 /*
125 * OFDM:
126 *
127 * N_DBPS = DATARATE x 4
128 * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
129 * (16 = SIGNAL time, 6 = tail bits)
130 * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
131 *
132 * T_SYM = 4 usec
133 * 802.11a - 17.5.2: aSIFSTime = 16 usec
134 * 802.11g - 19.8.4: aSIFSTime = 10 usec +
135 * signal ext = 6 usec
136 */
137 dur = 16; /* SIFS + signal ext */
138 dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */
139 dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */
140 dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
141 4 * rate); /* T_SYM x N_SYM */
142 } else {
143 /*
144 * 802.11b or 802.11g with 802.11b compatibility:
145 * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
146 * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
147 *
148 * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
149 * aSIFSTime = 10 usec
150 * aPreambleLength = 144 usec or 72 usec with short preamble
151 * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
152 */
153 dur = 10; /* aSIFSTime = 10 usec */
154 dur += short_preamble ? (72 + 24) : (144 + 48);
155
156 dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
157 }
158
159 return dur;
160 }
161
162 /* Exported duration function for driver use */
163 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
164 struct ieee80211_vif *vif,
165 enum ieee80211_band band,
166 size_t frame_len,
167 struct ieee80211_rate *rate)
168 {
169 struct ieee80211_sub_if_data *sdata;
170 u16 dur;
171 int erp;
172 bool short_preamble = false;
173
174 erp = 0;
175 if (vif) {
176 sdata = vif_to_sdata(vif);
177 short_preamble = sdata->vif.bss_conf.use_short_preamble;
178 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
179 erp = rate->flags & IEEE80211_RATE_ERP_G;
180 }
181
182 dur = ieee80211_frame_duration(band, frame_len, rate->bitrate, erp,
183 short_preamble);
184
185 return cpu_to_le16(dur);
186 }
187 EXPORT_SYMBOL(ieee80211_generic_frame_duration);
188
189 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
190 struct ieee80211_vif *vif, size_t frame_len,
191 const struct ieee80211_tx_info *frame_txctl)
192 {
193 struct ieee80211_local *local = hw_to_local(hw);
194 struct ieee80211_rate *rate;
195 struct ieee80211_sub_if_data *sdata;
196 bool short_preamble;
197 int erp;
198 u16 dur;
199 struct ieee80211_supported_band *sband;
200
201 sband = local->hw.wiphy->bands[frame_txctl->band];
202
203 short_preamble = false;
204
205 rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
206
207 erp = 0;
208 if (vif) {
209 sdata = vif_to_sdata(vif);
210 short_preamble = sdata->vif.bss_conf.use_short_preamble;
211 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
212 erp = rate->flags & IEEE80211_RATE_ERP_G;
213 }
214
215 /* CTS duration */
216 dur = ieee80211_frame_duration(sband->band, 10, rate->bitrate,
217 erp, short_preamble);
218 /* Data frame duration */
219 dur += ieee80211_frame_duration(sband->band, frame_len, rate->bitrate,
220 erp, short_preamble);
221 /* ACK duration */
222 dur += ieee80211_frame_duration(sband->band, 10, rate->bitrate,
223 erp, short_preamble);
224
225 return cpu_to_le16(dur);
226 }
227 EXPORT_SYMBOL(ieee80211_rts_duration);
228
229 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
230 struct ieee80211_vif *vif,
231 size_t frame_len,
232 const struct ieee80211_tx_info *frame_txctl)
233 {
234 struct ieee80211_local *local = hw_to_local(hw);
235 struct ieee80211_rate *rate;
236 struct ieee80211_sub_if_data *sdata;
237 bool short_preamble;
238 int erp;
239 u16 dur;
240 struct ieee80211_supported_band *sband;
241
242 sband = local->hw.wiphy->bands[frame_txctl->band];
243
244 short_preamble = false;
245
246 rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
247 erp = 0;
248 if (vif) {
249 sdata = vif_to_sdata(vif);
250 short_preamble = sdata->vif.bss_conf.use_short_preamble;
251 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
252 erp = rate->flags & IEEE80211_RATE_ERP_G;
253 }
254
255 /* Data frame duration */
256 dur = ieee80211_frame_duration(sband->band, frame_len, rate->bitrate,
257 erp, short_preamble);
258 if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
259 /* ACK duration */
260 dur += ieee80211_frame_duration(sband->band, 10, rate->bitrate,
261 erp, short_preamble);
262 }
263
264 return cpu_to_le16(dur);
265 }
266 EXPORT_SYMBOL(ieee80211_ctstoself_duration);
267
268 void ieee80211_propagate_queue_wake(struct ieee80211_local *local, int queue)
269 {
270 struct ieee80211_sub_if_data *sdata;
271 int n_acs = IEEE80211_NUM_ACS;
272
273 if (local->hw.queues < IEEE80211_NUM_ACS)
274 n_acs = 1;
275
276 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
277 int ac;
278
279 if (test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))
280 continue;
281
282 if (sdata->vif.cab_queue != IEEE80211_INVAL_HW_QUEUE &&
283 local->queue_stop_reasons[sdata->vif.cab_queue] != 0)
284 continue;
285
286 for (ac = 0; ac < n_acs; ac++) {
287 int ac_queue = sdata->vif.hw_queue[ac];
288
289 if (ac_queue == queue ||
290 (sdata->vif.cab_queue == queue &&
291 local->queue_stop_reasons[ac_queue] == 0 &&
292 skb_queue_empty(&local->pending[ac_queue])))
293 netif_wake_subqueue(sdata->dev, ac);
294 }
295 }
296 }
297
298 static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
299 enum queue_stop_reason reason)
300 {
301 struct ieee80211_local *local = hw_to_local(hw);
302
303 trace_wake_queue(local, queue, reason);
304
305 if (WARN_ON(queue >= hw->queues))
306 return;
307
308 if (!test_bit(reason, &local->queue_stop_reasons[queue]))
309 return;
310
311 __clear_bit(reason, &local->queue_stop_reasons[queue]);
312
313 if (local->queue_stop_reasons[queue] != 0)
314 /* someone still has this queue stopped */
315 return;
316
317 if (skb_queue_empty(&local->pending[queue])) {
318 rcu_read_lock();
319 ieee80211_propagate_queue_wake(local, queue);
320 rcu_read_unlock();
321 } else
322 tasklet_schedule(&local->tx_pending_tasklet);
323 }
324
325 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
326 enum queue_stop_reason reason)
327 {
328 struct ieee80211_local *local = hw_to_local(hw);
329 unsigned long flags;
330
331 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
332 __ieee80211_wake_queue(hw, queue, reason);
333 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
334 }
335
336 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
337 {
338 ieee80211_wake_queue_by_reason(hw, queue,
339 IEEE80211_QUEUE_STOP_REASON_DRIVER);
340 }
341 EXPORT_SYMBOL(ieee80211_wake_queue);
342
343 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
344 enum queue_stop_reason reason)
345 {
346 struct ieee80211_local *local = hw_to_local(hw);
347 struct ieee80211_sub_if_data *sdata;
348 int n_acs = IEEE80211_NUM_ACS;
349
350 trace_stop_queue(local, queue, reason);
351
352 if (WARN_ON(queue >= hw->queues))
353 return;
354
355 if (test_bit(reason, &local->queue_stop_reasons[queue]))
356 return;
357
358 __set_bit(reason, &local->queue_stop_reasons[queue]);
359
360 if (local->hw.queues < IEEE80211_NUM_ACS)
361 n_acs = 1;
362
363 rcu_read_lock();
364 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
365 int ac;
366
367 for (ac = 0; ac < n_acs; ac++) {
368 if (sdata->vif.hw_queue[ac] == queue ||
369 sdata->vif.cab_queue == queue)
370 netif_stop_subqueue(sdata->dev, ac);
371 }
372 }
373 rcu_read_unlock();
374 }
375
376 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
377 enum queue_stop_reason reason)
378 {
379 struct ieee80211_local *local = hw_to_local(hw);
380 unsigned long flags;
381
382 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
383 __ieee80211_stop_queue(hw, queue, reason);
384 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
385 }
386
387 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
388 {
389 ieee80211_stop_queue_by_reason(hw, queue,
390 IEEE80211_QUEUE_STOP_REASON_DRIVER);
391 }
392 EXPORT_SYMBOL(ieee80211_stop_queue);
393
394 void ieee80211_add_pending_skb(struct ieee80211_local *local,
395 struct sk_buff *skb)
396 {
397 struct ieee80211_hw *hw = &local->hw;
398 unsigned long flags;
399 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
400 int queue = info->hw_queue;
401
402 if (WARN_ON(!info->control.vif)) {
403 kfree_skb(skb);
404 return;
405 }
406
407 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
408 __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
409 __skb_queue_tail(&local->pending[queue], skb);
410 __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
411 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
412 }
413
414 void ieee80211_add_pending_skbs_fn(struct ieee80211_local *local,
415 struct sk_buff_head *skbs,
416 void (*fn)(void *data), void *data)
417 {
418 struct ieee80211_hw *hw = &local->hw;
419 struct sk_buff *skb;
420 unsigned long flags;
421 int queue, i;
422
423 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
424 while ((skb = skb_dequeue(skbs))) {
425 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
426
427 if (WARN_ON(!info->control.vif)) {
428 kfree_skb(skb);
429 continue;
430 }
431
432 queue = info->hw_queue;
433
434 __ieee80211_stop_queue(hw, queue,
435 IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
436
437 __skb_queue_tail(&local->pending[queue], skb);
438 }
439
440 if (fn)
441 fn(data);
442
443 for (i = 0; i < hw->queues; i++)
444 __ieee80211_wake_queue(hw, i,
445 IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
446 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
447 }
448
449 void ieee80211_stop_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_stop_queue(hw, i, reason);
460
461 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
462 }
463
464 void ieee80211_stop_queues(struct ieee80211_hw *hw)
465 {
466 ieee80211_stop_queues_by_reason(hw,
467 IEEE80211_QUEUE_STOP_REASON_DRIVER);
468 }
469 EXPORT_SYMBOL(ieee80211_stop_queues);
470
471 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
472 {
473 struct ieee80211_local *local = hw_to_local(hw);
474 unsigned long flags;
475 int ret;
476
477 if (WARN_ON(queue >= hw->queues))
478 return true;
479
480 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
481 ret = !!local->queue_stop_reasons[queue];
482 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
483 return ret;
484 }
485 EXPORT_SYMBOL(ieee80211_queue_stopped);
486
487 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
488 enum queue_stop_reason reason)
489 {
490 struct ieee80211_local *local = hw_to_local(hw);
491 unsigned long flags;
492 int i;
493
494 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
495
496 for (i = 0; i < hw->queues; i++)
497 __ieee80211_wake_queue(hw, i, reason);
498
499 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
500 }
501
502 void ieee80211_wake_queues(struct ieee80211_hw *hw)
503 {
504 ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
505 }
506 EXPORT_SYMBOL(ieee80211_wake_queues);
507
508 void ieee80211_iterate_active_interfaces(
509 struct ieee80211_hw *hw,
510 void (*iterator)(void *data, u8 *mac,
511 struct ieee80211_vif *vif),
512 void *data)
513 {
514 struct ieee80211_local *local = hw_to_local(hw);
515 struct ieee80211_sub_if_data *sdata;
516
517 mutex_lock(&local->iflist_mtx);
518
519 list_for_each_entry(sdata, &local->interfaces, list) {
520 switch (sdata->vif.type) {
521 case NL80211_IFTYPE_MONITOR:
522 case NL80211_IFTYPE_AP_VLAN:
523 continue;
524 default:
525 break;
526 }
527 if (ieee80211_sdata_running(sdata))
528 iterator(data, sdata->vif.addr,
529 &sdata->vif);
530 }
531
532 sdata = rcu_dereference_protected(local->monitor_sdata,
533 lockdep_is_held(&local->iflist_mtx));
534 if (sdata)
535 iterator(data, sdata->vif.addr, &sdata->vif);
536
537 mutex_unlock(&local->iflist_mtx);
538 }
539 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
540
541 void ieee80211_iterate_active_interfaces_atomic(
542 struct ieee80211_hw *hw,
543 void (*iterator)(void *data, u8 *mac,
544 struct ieee80211_vif *vif),
545 void *data)
546 {
547 struct ieee80211_local *local = hw_to_local(hw);
548 struct ieee80211_sub_if_data *sdata;
549
550 rcu_read_lock();
551
552 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
553 switch (sdata->vif.type) {
554 case NL80211_IFTYPE_MONITOR:
555 case NL80211_IFTYPE_AP_VLAN:
556 continue;
557 default:
558 break;
559 }
560 if (ieee80211_sdata_running(sdata))
561 iterator(data, sdata->vif.addr,
562 &sdata->vif);
563 }
564
565 sdata = rcu_dereference(local->monitor_sdata);
566 if (sdata)
567 iterator(data, sdata->vif.addr, &sdata->vif);
568
569 rcu_read_unlock();
570 }
571 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
572
573 /*
574 * Nothing should have been stuffed into the workqueue during
575 * the suspend->resume cycle. If this WARN is seen then there
576 * is a bug with either the driver suspend or something in
577 * mac80211 stuffing into the workqueue which we haven't yet
578 * cleared during mac80211's suspend cycle.
579 */
580 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
581 {
582 if (WARN(local->suspended && !local->resuming,
583 "queueing ieee80211 work while going to suspend\n"))
584 return false;
585
586 return true;
587 }
588
589 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
590 {
591 struct ieee80211_local *local = hw_to_local(hw);
592
593 if (!ieee80211_can_queue_work(local))
594 return;
595
596 queue_work(local->workqueue, work);
597 }
598 EXPORT_SYMBOL(ieee80211_queue_work);
599
600 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
601 struct delayed_work *dwork,
602 unsigned long delay)
603 {
604 struct ieee80211_local *local = hw_to_local(hw);
605
606 if (!ieee80211_can_queue_work(local))
607 return;
608
609 queue_delayed_work(local->workqueue, dwork, delay);
610 }
611 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
612
613 u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
614 struct ieee802_11_elems *elems,
615 u64 filter, u32 crc)
616 {
617 size_t left = len;
618 u8 *pos = start;
619 bool calc_crc = filter != 0;
620 DECLARE_BITMAP(seen_elems, 256);
621
622 bitmap_zero(seen_elems, 256);
623 memset(elems, 0, sizeof(*elems));
624 elems->ie_start = start;
625 elems->total_len = len;
626
627 while (left >= 2) {
628 u8 id, elen;
629 bool elem_parse_failed;
630
631 id = *pos++;
632 elen = *pos++;
633 left -= 2;
634
635 if (elen > left) {
636 elems->parse_error = true;
637 break;
638 }
639
640 if (id != WLAN_EID_VENDOR_SPECIFIC &&
641 id != WLAN_EID_QUIET &&
642 test_bit(id, seen_elems)) {
643 elems->parse_error = true;
644 left -= elen;
645 pos += elen;
646 continue;
647 }
648
649 if (calc_crc && id < 64 && (filter & (1ULL << id)))
650 crc = crc32_be(crc, pos - 2, elen + 2);
651
652 elem_parse_failed = false;
653
654 switch (id) {
655 case WLAN_EID_SSID:
656 elems->ssid = pos;
657 elems->ssid_len = elen;
658 break;
659 case WLAN_EID_SUPP_RATES:
660 elems->supp_rates = pos;
661 elems->supp_rates_len = elen;
662 break;
663 case WLAN_EID_FH_PARAMS:
664 elems->fh_params = pos;
665 elems->fh_params_len = elen;
666 break;
667 case WLAN_EID_DS_PARAMS:
668 elems->ds_params = pos;
669 elems->ds_params_len = elen;
670 break;
671 case WLAN_EID_CF_PARAMS:
672 elems->cf_params = pos;
673 elems->cf_params_len = elen;
674 break;
675 case WLAN_EID_TIM:
676 if (elen >= sizeof(struct ieee80211_tim_ie)) {
677 elems->tim = (void *)pos;
678 elems->tim_len = elen;
679 } else
680 elem_parse_failed = true;
681 break;
682 case WLAN_EID_IBSS_PARAMS:
683 elems->ibss_params = pos;
684 elems->ibss_params_len = elen;
685 break;
686 case WLAN_EID_CHALLENGE:
687 elems->challenge = pos;
688 elems->challenge_len = elen;
689 break;
690 case WLAN_EID_VENDOR_SPECIFIC:
691 if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
692 pos[2] == 0xf2) {
693 /* Microsoft OUI (00:50:F2) */
694
695 if (calc_crc)
696 crc = crc32_be(crc, pos - 2, elen + 2);
697
698 if (pos[3] == 1) {
699 /* OUI Type 1 - WPA IE */
700 elems->wpa = pos;
701 elems->wpa_len = elen;
702 } else if (elen >= 5 && pos[3] == 2) {
703 /* OUI Type 2 - WMM IE */
704 if (pos[4] == 0) {
705 elems->wmm_info = pos;
706 elems->wmm_info_len = elen;
707 } else if (pos[4] == 1) {
708 elems->wmm_param = pos;
709 elems->wmm_param_len = elen;
710 }
711 }
712 }
713 break;
714 case WLAN_EID_RSN:
715 elems->rsn = pos;
716 elems->rsn_len = elen;
717 break;
718 case WLAN_EID_ERP_INFO:
719 elems->erp_info = pos;
720 elems->erp_info_len = elen;
721 break;
722 case WLAN_EID_EXT_SUPP_RATES:
723 elems->ext_supp_rates = pos;
724 elems->ext_supp_rates_len = elen;
725 break;
726 case WLAN_EID_HT_CAPABILITY:
727 if (elen >= sizeof(struct ieee80211_ht_cap))
728 elems->ht_cap_elem = (void *)pos;
729 else
730 elem_parse_failed = true;
731 break;
732 case WLAN_EID_HT_OPERATION:
733 if (elen >= sizeof(struct ieee80211_ht_operation))
734 elems->ht_operation = (void *)pos;
735 else
736 elem_parse_failed = true;
737 break;
738 case WLAN_EID_MESH_ID:
739 elems->mesh_id = pos;
740 elems->mesh_id_len = elen;
741 break;
742 case WLAN_EID_MESH_CONFIG:
743 if (elen >= sizeof(struct ieee80211_meshconf_ie))
744 elems->mesh_config = (void *)pos;
745 else
746 elem_parse_failed = true;
747 break;
748 case WLAN_EID_PEER_MGMT:
749 elems->peering = pos;
750 elems->peering_len = elen;
751 break;
752 case WLAN_EID_PREQ:
753 elems->preq = pos;
754 elems->preq_len = elen;
755 break;
756 case WLAN_EID_PREP:
757 elems->prep = pos;
758 elems->prep_len = elen;
759 break;
760 case WLAN_EID_PERR:
761 elems->perr = pos;
762 elems->perr_len = elen;
763 break;
764 case WLAN_EID_RANN:
765 if (elen >= sizeof(struct ieee80211_rann_ie))
766 elems->rann = (void *)pos;
767 else
768 elem_parse_failed = true;
769 break;
770 case WLAN_EID_CHANNEL_SWITCH:
771 elems->ch_switch_elem = pos;
772 elems->ch_switch_elem_len = elen;
773 break;
774 case WLAN_EID_QUIET:
775 if (!elems->quiet_elem) {
776 elems->quiet_elem = pos;
777 elems->quiet_elem_len = elen;
778 }
779 elems->num_of_quiet_elem++;
780 break;
781 case WLAN_EID_COUNTRY:
782 elems->country_elem = pos;
783 elems->country_elem_len = elen;
784 break;
785 case WLAN_EID_PWR_CONSTRAINT:
786 elems->pwr_constr_elem = pos;
787 elems->pwr_constr_elem_len = elen;
788 break;
789 case WLAN_EID_TIMEOUT_INTERVAL:
790 elems->timeout_int = pos;
791 elems->timeout_int_len = elen;
792 break;
793 default:
794 break;
795 }
796
797 if (elem_parse_failed)
798 elems->parse_error = true;
799 else
800 set_bit(id, seen_elems);
801
802 left -= elen;
803 pos += elen;
804 }
805
806 if (left != 0)
807 elems->parse_error = true;
808
809 return crc;
810 }
811
812 void ieee802_11_parse_elems(u8 *start, size_t len,
813 struct ieee802_11_elems *elems)
814 {
815 ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
816 }
817
818 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata,
819 bool bss_notify)
820 {
821 struct ieee80211_local *local = sdata->local;
822 struct ieee80211_tx_queue_params qparam;
823 int ac;
824 bool use_11b, enable_qos;
825 int aCWmin, aCWmax;
826
827 if (!local->ops->conf_tx)
828 return;
829
830 if (local->hw.queues < IEEE80211_NUM_ACS)
831 return;
832
833 memset(&qparam, 0, sizeof(qparam));
834
835 use_11b = (local->oper_channel->band == IEEE80211_BAND_2GHZ) &&
836 !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
837
838 /*
839 * By default disable QoS in STA mode for old access points, which do
840 * not support 802.11e. New APs will provide proper queue parameters,
841 * that we will configure later.
842 */
843 enable_qos = (sdata->vif.type != NL80211_IFTYPE_STATION);
844
845 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
846 /* Set defaults according to 802.11-2007 Table 7-37 */
847 aCWmax = 1023;
848 if (use_11b)
849 aCWmin = 31;
850 else
851 aCWmin = 15;
852
853 if (enable_qos) {
854 switch (ac) {
855 case IEEE80211_AC_BK:
856 qparam.cw_max = aCWmax;
857 qparam.cw_min = aCWmin;
858 qparam.txop = 0;
859 qparam.aifs = 7;
860 break;
861 /* never happens but let's not leave undefined */
862 default:
863 case IEEE80211_AC_BE:
864 qparam.cw_max = aCWmax;
865 qparam.cw_min = aCWmin;
866 qparam.txop = 0;
867 qparam.aifs = 3;
868 break;
869 case IEEE80211_AC_VI:
870 qparam.cw_max = aCWmin;
871 qparam.cw_min = (aCWmin + 1) / 2 - 1;
872 if (use_11b)
873 qparam.txop = 6016/32;
874 else
875 qparam.txop = 3008/32;
876 qparam.aifs = 2;
877 break;
878 case IEEE80211_AC_VO:
879 qparam.cw_max = (aCWmin + 1) / 2 - 1;
880 qparam.cw_min = (aCWmin + 1) / 4 - 1;
881 if (use_11b)
882 qparam.txop = 3264/32;
883 else
884 qparam.txop = 1504/32;
885 qparam.aifs = 2;
886 break;
887 }
888 } else {
889 /* Confiure old 802.11b/g medium access rules. */
890 qparam.cw_max = aCWmax;
891 qparam.cw_min = aCWmin;
892 qparam.txop = 0;
893 qparam.aifs = 2;
894 }
895
896 qparam.uapsd = false;
897
898 sdata->tx_conf[ac] = qparam;
899 drv_conf_tx(local, sdata, ac, &qparam);
900 }
901
902 if (sdata->vif.type != NL80211_IFTYPE_MONITOR) {
903 sdata->vif.bss_conf.qos = enable_qos;
904 if (bss_notify)
905 ieee80211_bss_info_change_notify(sdata,
906 BSS_CHANGED_QOS);
907 }
908 }
909
910 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
911 const size_t supp_rates_len,
912 const u8 *supp_rates)
913 {
914 struct ieee80211_local *local = sdata->local;
915 int i, have_higher_than_11mbit = 0;
916
917 /* cf. IEEE 802.11 9.2.12 */
918 for (i = 0; i < supp_rates_len; i++)
919 if ((supp_rates[i] & 0x7f) * 5 > 110)
920 have_higher_than_11mbit = 1;
921
922 if (local->oper_channel->band == IEEE80211_BAND_2GHZ &&
923 have_higher_than_11mbit)
924 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
925 else
926 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
927
928 ieee80211_set_wmm_default(sdata, true);
929 }
930
931 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
932 enum ieee80211_band band)
933 {
934 struct ieee80211_supported_band *sband;
935 struct ieee80211_rate *bitrates;
936 u32 mandatory_rates;
937 enum ieee80211_rate_flags mandatory_flag;
938 int i;
939
940 sband = local->hw.wiphy->bands[band];
941 if (WARN_ON(!sband))
942 return 1;
943
944 if (band == IEEE80211_BAND_2GHZ)
945 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
946 else
947 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
948
949 bitrates = sband->bitrates;
950 mandatory_rates = 0;
951 for (i = 0; i < sband->n_bitrates; i++)
952 if (bitrates[i].flags & mandatory_flag)
953 mandatory_rates |= BIT(i);
954 return mandatory_rates;
955 }
956
957 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
958 u16 transaction, u16 auth_alg,
959 u8 *extra, size_t extra_len, const u8 *da,
960 const u8 *bssid, const u8 *key, u8 key_len, u8 key_idx)
961 {
962 struct ieee80211_local *local = sdata->local;
963 struct sk_buff *skb;
964 struct ieee80211_mgmt *mgmt;
965 int err;
966
967 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
968 sizeof(*mgmt) + 6 + extra_len);
969 if (!skb)
970 return;
971
972 skb_reserve(skb, local->hw.extra_tx_headroom);
973
974 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
975 memset(mgmt, 0, 24 + 6);
976 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
977 IEEE80211_STYPE_AUTH);
978 memcpy(mgmt->da, da, ETH_ALEN);
979 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
980 memcpy(mgmt->bssid, bssid, ETH_ALEN);
981 mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
982 mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
983 mgmt->u.auth.status_code = cpu_to_le16(0);
984 if (extra)
985 memcpy(skb_put(skb, extra_len), extra, extra_len);
986
987 if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
988 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
989 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
990 WARN_ON(err);
991 }
992
993 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
994 ieee80211_tx_skb(sdata, skb);
995 }
996
997 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
998 const u8 *ie, size_t ie_len,
999 enum ieee80211_band band, u32 rate_mask,
1000 u8 channel)
1001 {
1002 struct ieee80211_supported_band *sband;
1003 u8 *pos;
1004 size_t offset = 0, noffset;
1005 int supp_rates_len, i;
1006 u8 rates[32];
1007 int num_rates;
1008 int ext_rates_len;
1009
1010 sband = local->hw.wiphy->bands[band];
1011 if (WARN_ON_ONCE(!sband))
1012 return 0;
1013
1014 pos = buffer;
1015
1016 num_rates = 0;
1017 for (i = 0; i < sband->n_bitrates; i++) {
1018 if ((BIT(i) & rate_mask) == 0)
1019 continue; /* skip rate */
1020 rates[num_rates++] = (u8) (sband->bitrates[i].bitrate / 5);
1021 }
1022
1023 supp_rates_len = min_t(int, num_rates, 8);
1024
1025 *pos++ = WLAN_EID_SUPP_RATES;
1026 *pos++ = supp_rates_len;
1027 memcpy(pos, rates, supp_rates_len);
1028 pos += supp_rates_len;
1029
1030 /* insert "request information" if in custom IEs */
1031 if (ie && ie_len) {
1032 static const u8 before_extrates[] = {
1033 WLAN_EID_SSID,
1034 WLAN_EID_SUPP_RATES,
1035 WLAN_EID_REQUEST,
1036 };
1037 noffset = ieee80211_ie_split(ie, ie_len,
1038 before_extrates,
1039 ARRAY_SIZE(before_extrates),
1040 offset);
1041 memcpy(pos, ie + offset, noffset - offset);
1042 pos += noffset - offset;
1043 offset = noffset;
1044 }
1045
1046 ext_rates_len = num_rates - supp_rates_len;
1047 if (ext_rates_len > 0) {
1048 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1049 *pos++ = ext_rates_len;
1050 memcpy(pos, rates + supp_rates_len, ext_rates_len);
1051 pos += ext_rates_len;
1052 }
1053
1054 if (channel && sband->band == IEEE80211_BAND_2GHZ) {
1055 *pos++ = WLAN_EID_DS_PARAMS;
1056 *pos++ = 1;
1057 *pos++ = channel;
1058 }
1059
1060 /* insert custom IEs that go before HT */
1061 if (ie && ie_len) {
1062 static const u8 before_ht[] = {
1063 WLAN_EID_SSID,
1064 WLAN_EID_SUPP_RATES,
1065 WLAN_EID_REQUEST,
1066 WLAN_EID_EXT_SUPP_RATES,
1067 WLAN_EID_DS_PARAMS,
1068 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1069 };
1070 noffset = ieee80211_ie_split(ie, ie_len,
1071 before_ht, ARRAY_SIZE(before_ht),
1072 offset);
1073 memcpy(pos, ie + offset, noffset - offset);
1074 pos += noffset - offset;
1075 offset = noffset;
1076 }
1077
1078 if (sband->ht_cap.ht_supported)
1079 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
1080 sband->ht_cap.cap);
1081
1082 /*
1083 * If adding more here, adjust code in main.c
1084 * that calculates local->scan_ies_len.
1085 */
1086
1087 /* add any remaining custom IEs */
1088 if (ie && ie_len) {
1089 noffset = ie_len;
1090 memcpy(pos, ie + offset, noffset - offset);
1091 pos += noffset - offset;
1092 }
1093
1094 if (sband->vht_cap.vht_supported)
1095 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
1096 sband->vht_cap.cap);
1097
1098 return pos - buffer;
1099 }
1100
1101 struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
1102 u8 *dst, u32 ratemask,
1103 struct ieee80211_channel *chan,
1104 const u8 *ssid, size_t ssid_len,
1105 const u8 *ie, size_t ie_len,
1106 bool directed)
1107 {
1108 struct ieee80211_local *local = sdata->local;
1109 struct sk_buff *skb;
1110 struct ieee80211_mgmt *mgmt;
1111 size_t buf_len;
1112 u8 *buf;
1113 u8 chan_no;
1114
1115 /* FIXME: come up with a proper value */
1116 buf = kmalloc(200 + ie_len, GFP_KERNEL);
1117 if (!buf)
1118 return NULL;
1119
1120 /*
1121 * Do not send DS Channel parameter for directed probe requests
1122 * in order to maximize the chance that we get a response. Some
1123 * badly-behaved APs don't respond when this parameter is included.
1124 */
1125 if (directed)
1126 chan_no = 0;
1127 else
1128 chan_no = ieee80211_frequency_to_channel(chan->center_freq);
1129
1130 buf_len = ieee80211_build_preq_ies(local, buf, ie, ie_len, chan->band,
1131 ratemask, chan_no);
1132
1133 skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
1134 ssid, ssid_len,
1135 buf, buf_len);
1136 if (!skb)
1137 goto out;
1138
1139 if (dst) {
1140 mgmt = (struct ieee80211_mgmt *) skb->data;
1141 memcpy(mgmt->da, dst, ETH_ALEN);
1142 memcpy(mgmt->bssid, dst, ETH_ALEN);
1143 }
1144
1145 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1146
1147 out:
1148 kfree(buf);
1149
1150 return skb;
1151 }
1152
1153 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1154 const u8 *ssid, size_t ssid_len,
1155 const u8 *ie, size_t ie_len,
1156 u32 ratemask, bool directed, bool no_cck)
1157 {
1158 struct sk_buff *skb;
1159
1160 skb = ieee80211_build_probe_req(sdata, dst, ratemask,
1161 sdata->local->hw.conf.channel,
1162 ssid, ssid_len,
1163 ie, ie_len, directed);
1164 if (skb) {
1165 if (no_cck)
1166 IEEE80211_SKB_CB(skb)->flags |=
1167 IEEE80211_TX_CTL_NO_CCK_RATE;
1168 ieee80211_tx_skb(sdata, skb);
1169 }
1170 }
1171
1172 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
1173 struct ieee802_11_elems *elems,
1174 enum ieee80211_band band, u32 *basic_rates)
1175 {
1176 struct ieee80211_supported_band *sband;
1177 struct ieee80211_rate *bitrates;
1178 size_t num_rates;
1179 u32 supp_rates;
1180 int i, j;
1181 sband = local->hw.wiphy->bands[band];
1182
1183 if (WARN_ON(!sband))
1184 return 1;
1185
1186 bitrates = sband->bitrates;
1187 num_rates = sband->n_bitrates;
1188 supp_rates = 0;
1189 for (i = 0; i < elems->supp_rates_len +
1190 elems->ext_supp_rates_len; i++) {
1191 u8 rate = 0;
1192 int own_rate;
1193 bool is_basic;
1194 if (i < elems->supp_rates_len)
1195 rate = elems->supp_rates[i];
1196 else if (elems->ext_supp_rates)
1197 rate = elems->ext_supp_rates
1198 [i - elems->supp_rates_len];
1199 own_rate = 5 * (rate & 0x7f);
1200 is_basic = !!(rate & 0x80);
1201
1202 if (is_basic && (rate & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1203 continue;
1204
1205 for (j = 0; j < num_rates; j++) {
1206 if (bitrates[j].bitrate == own_rate) {
1207 supp_rates |= BIT(j);
1208 if (basic_rates && is_basic)
1209 *basic_rates |= BIT(j);
1210 }
1211 }
1212 }
1213 return supp_rates;
1214 }
1215
1216 void ieee80211_stop_device(struct ieee80211_local *local)
1217 {
1218 ieee80211_led_radio(local, false);
1219 ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
1220
1221 cancel_work_sync(&local->reconfig_filter);
1222
1223 flush_workqueue(local->workqueue);
1224 drv_stop(local);
1225 }
1226
1227 int ieee80211_reconfig(struct ieee80211_local *local)
1228 {
1229 struct ieee80211_hw *hw = &local->hw;
1230 struct ieee80211_sub_if_data *sdata;
1231 struct sta_info *sta;
1232 int res, i;
1233
1234 #ifdef CONFIG_PM
1235 if (local->suspended)
1236 local->resuming = true;
1237
1238 if (local->wowlan) {
1239 local->wowlan = false;
1240 res = drv_resume(local);
1241 if (res < 0) {
1242 local->resuming = false;
1243 return res;
1244 }
1245 if (res == 0)
1246 goto wake_up;
1247 WARN_ON(res > 1);
1248 /*
1249 * res is 1, which means the driver requested
1250 * to go through a regular reset on wakeup.
1251 */
1252 }
1253 #endif
1254 /* everything else happens only if HW was up & running */
1255 if (!local->open_count)
1256 goto wake_up;
1257
1258 /*
1259 * Upon resume hardware can sometimes be goofy due to
1260 * various platform / driver / bus issues, so restarting
1261 * the device may at times not work immediately. Propagate
1262 * the error.
1263 */
1264 res = drv_start(local);
1265 if (res) {
1266 WARN(local->suspended, "Hardware became unavailable "
1267 "upon resume. This could be a software issue "
1268 "prior to suspend or a hardware issue.\n");
1269 return res;
1270 }
1271
1272 /* setup fragmentation threshold */
1273 drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
1274
1275 /* setup RTS threshold */
1276 drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1277
1278 /* reset coverage class */
1279 drv_set_coverage_class(local, hw->wiphy->coverage_class);
1280
1281 ieee80211_led_radio(local, true);
1282 ieee80211_mod_tpt_led_trig(local,
1283 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1284
1285 /* add interfaces */
1286 sdata = rtnl_dereference(local->monitor_sdata);
1287 if (sdata) {
1288 res = drv_add_interface(local, sdata);
1289 if (WARN_ON(res)) {
1290 rcu_assign_pointer(local->monitor_sdata, NULL);
1291 synchronize_net();
1292 kfree(sdata);
1293 }
1294 }
1295
1296 list_for_each_entry(sdata, &local->interfaces, list) {
1297 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1298 sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1299 ieee80211_sdata_running(sdata))
1300 res = drv_add_interface(local, sdata);
1301 }
1302
1303 /* add STAs back */
1304 mutex_lock(&local->sta_mtx);
1305 list_for_each_entry(sta, &local->sta_list, list) {
1306 enum ieee80211_sta_state state;
1307
1308 if (!sta->uploaded)
1309 continue;
1310
1311 /* AP-mode stations will be added later */
1312 if (sta->sdata->vif.type == NL80211_IFTYPE_AP)
1313 continue;
1314
1315 for (state = IEEE80211_STA_NOTEXIST;
1316 state < sta->sta_state; state++)
1317 WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1318 state + 1));
1319 }
1320 mutex_unlock(&local->sta_mtx);
1321
1322 /* reconfigure tx conf */
1323 if (hw->queues >= IEEE80211_NUM_ACS) {
1324 list_for_each_entry(sdata, &local->interfaces, list) {
1325 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1326 sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1327 !ieee80211_sdata_running(sdata))
1328 continue;
1329
1330 for (i = 0; i < IEEE80211_NUM_ACS; i++)
1331 drv_conf_tx(local, sdata, i,
1332 &sdata->tx_conf[i]);
1333 }
1334 }
1335
1336 /* reconfigure hardware */
1337 ieee80211_hw_config(local, ~0);
1338
1339 ieee80211_configure_filter(local);
1340
1341 /* Finally also reconfigure all the BSS information */
1342 list_for_each_entry(sdata, &local->interfaces, list) {
1343 u32 changed;
1344
1345 if (!ieee80211_sdata_running(sdata))
1346 continue;
1347
1348 /* common change flags for all interface types */
1349 changed = BSS_CHANGED_ERP_CTS_PROT |
1350 BSS_CHANGED_ERP_PREAMBLE |
1351 BSS_CHANGED_ERP_SLOT |
1352 BSS_CHANGED_HT |
1353 BSS_CHANGED_BASIC_RATES |
1354 BSS_CHANGED_BEACON_INT |
1355 BSS_CHANGED_BSSID |
1356 BSS_CHANGED_CQM |
1357 BSS_CHANGED_QOS |
1358 BSS_CHANGED_IDLE;
1359
1360 switch (sdata->vif.type) {
1361 case NL80211_IFTYPE_STATION:
1362 changed |= BSS_CHANGED_ASSOC |
1363 BSS_CHANGED_ARP_FILTER |
1364 BSS_CHANGED_PS;
1365 mutex_lock(&sdata->u.mgd.mtx);
1366 ieee80211_bss_info_change_notify(sdata, changed);
1367 mutex_unlock(&sdata->u.mgd.mtx);
1368 break;
1369 case NL80211_IFTYPE_ADHOC:
1370 changed |= BSS_CHANGED_IBSS;
1371 /* fall through */
1372 case NL80211_IFTYPE_AP:
1373 changed |= BSS_CHANGED_SSID;
1374
1375 if (sdata->vif.type == NL80211_IFTYPE_AP)
1376 changed |= BSS_CHANGED_AP_PROBE_RESP;
1377
1378 /* fall through */
1379 case NL80211_IFTYPE_MESH_POINT:
1380 changed |= BSS_CHANGED_BEACON |
1381 BSS_CHANGED_BEACON_ENABLED;
1382 ieee80211_bss_info_change_notify(sdata, changed);
1383 break;
1384 case NL80211_IFTYPE_WDS:
1385 break;
1386 case NL80211_IFTYPE_AP_VLAN:
1387 case NL80211_IFTYPE_MONITOR:
1388 /* ignore virtual */
1389 break;
1390 case NL80211_IFTYPE_UNSPECIFIED:
1391 case NUM_NL80211_IFTYPES:
1392 case NL80211_IFTYPE_P2P_CLIENT:
1393 case NL80211_IFTYPE_P2P_GO:
1394 WARN_ON(1);
1395 break;
1396 }
1397 }
1398
1399 ieee80211_recalc_ps(local, -1);
1400
1401 /*
1402 * The sta might be in psm against the ap (e.g. because
1403 * this was the state before a hw restart), so we
1404 * explicitly send a null packet in order to make sure
1405 * it'll sync against the ap (and get out of psm).
1406 */
1407 if (!(local->hw.conf.flags & IEEE80211_CONF_PS)) {
1408 list_for_each_entry(sdata, &local->interfaces, list) {
1409 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1410 continue;
1411
1412 ieee80211_send_nullfunc(local, sdata, 0);
1413 }
1414 }
1415
1416 /* APs are now beaconing, add back stations */
1417 mutex_lock(&local->sta_mtx);
1418 list_for_each_entry(sta, &local->sta_list, list) {
1419 enum ieee80211_sta_state state;
1420
1421 if (!sta->uploaded)
1422 continue;
1423
1424 if (sta->sdata->vif.type != NL80211_IFTYPE_AP)
1425 continue;
1426
1427 for (state = IEEE80211_STA_NOTEXIST;
1428 state < sta->sta_state; state++)
1429 WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1430 state + 1));
1431 }
1432 mutex_unlock(&local->sta_mtx);
1433
1434 /* add back keys */
1435 list_for_each_entry(sdata, &local->interfaces, list)
1436 if (ieee80211_sdata_running(sdata))
1437 ieee80211_enable_keys(sdata);
1438
1439 wake_up:
1440 local->in_reconfig = false;
1441 barrier();
1442
1443 /*
1444 * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
1445 * sessions can be established after a resume.
1446 *
1447 * Also tear down aggregation sessions since reconfiguring
1448 * them in a hardware restart scenario is not easily done
1449 * right now, and the hardware will have lost information
1450 * about the sessions, but we and the AP still think they
1451 * are active. This is really a workaround though.
1452 */
1453 if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1454 mutex_lock(&local->sta_mtx);
1455
1456 list_for_each_entry(sta, &local->sta_list, list) {
1457 ieee80211_sta_tear_down_BA_sessions(sta, true);
1458 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
1459 }
1460
1461 mutex_unlock(&local->sta_mtx);
1462 }
1463
1464 ieee80211_wake_queues_by_reason(hw,
1465 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1466
1467 /*
1468 * If this is for hw restart things are still running.
1469 * We may want to change that later, however.
1470 */
1471 if (!local->suspended)
1472 return 0;
1473
1474 #ifdef CONFIG_PM
1475 /* first set suspended false, then resuming */
1476 local->suspended = false;
1477 mb();
1478 local->resuming = false;
1479
1480 list_for_each_entry(sdata, &local->interfaces, list) {
1481 switch(sdata->vif.type) {
1482 case NL80211_IFTYPE_STATION:
1483 ieee80211_sta_restart(sdata);
1484 break;
1485 case NL80211_IFTYPE_ADHOC:
1486 ieee80211_ibss_restart(sdata);
1487 break;
1488 case NL80211_IFTYPE_MESH_POINT:
1489 ieee80211_mesh_restart(sdata);
1490 break;
1491 default:
1492 break;
1493 }
1494 }
1495
1496 mod_timer(&local->sta_cleanup, jiffies + 1);
1497
1498 mutex_lock(&local->sta_mtx);
1499 list_for_each_entry(sta, &local->sta_list, list)
1500 mesh_plink_restart(sta);
1501 mutex_unlock(&local->sta_mtx);
1502 #else
1503 WARN_ON(1);
1504 #endif
1505 return 0;
1506 }
1507
1508 void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
1509 {
1510 struct ieee80211_sub_if_data *sdata;
1511 struct ieee80211_local *local;
1512 struct ieee80211_key *key;
1513
1514 if (WARN_ON(!vif))
1515 return;
1516
1517 sdata = vif_to_sdata(vif);
1518 local = sdata->local;
1519
1520 if (WARN_ON(!local->resuming))
1521 return;
1522
1523 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1524 return;
1525
1526 sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;
1527
1528 mutex_lock(&local->key_mtx);
1529 list_for_each_entry(key, &sdata->key_list, list)
1530 key->flags |= KEY_FLAG_TAINTED;
1531 mutex_unlock(&local->key_mtx);
1532 }
1533 EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);
1534
1535 static int check_mgd_smps(struct ieee80211_if_managed *ifmgd,
1536 enum ieee80211_smps_mode *smps_mode)
1537 {
1538 if (ifmgd->associated) {
1539 *smps_mode = ifmgd->ap_smps;
1540
1541 if (*smps_mode == IEEE80211_SMPS_AUTOMATIC) {
1542 if (ifmgd->powersave)
1543 *smps_mode = IEEE80211_SMPS_DYNAMIC;
1544 else
1545 *smps_mode = IEEE80211_SMPS_OFF;
1546 }
1547
1548 return 1;
1549 }
1550
1551 return 0;
1552 }
1553
1554 /* must hold iflist_mtx */
1555 void ieee80211_recalc_smps(struct ieee80211_local *local)
1556 {
1557 struct ieee80211_sub_if_data *sdata;
1558 enum ieee80211_smps_mode smps_mode = IEEE80211_SMPS_OFF;
1559 int count = 0;
1560
1561 lockdep_assert_held(&local->iflist_mtx);
1562
1563 /*
1564 * This function could be improved to handle multiple
1565 * interfaces better, but right now it makes any
1566 * non-station interfaces force SM PS to be turned
1567 * off. If there are multiple station interfaces it
1568 * could also use the best possible mode, e.g. if
1569 * one is in static and the other in dynamic then
1570 * dynamic is ok.
1571 */
1572
1573 list_for_each_entry(sdata, &local->interfaces, list) {
1574 if (!ieee80211_sdata_running(sdata))
1575 continue;
1576 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1577 goto set;
1578
1579 count += check_mgd_smps(&sdata->u.mgd, &smps_mode);
1580
1581 if (count > 1) {
1582 smps_mode = IEEE80211_SMPS_OFF;
1583 break;
1584 }
1585 }
1586
1587 if (smps_mode == local->smps_mode)
1588 return;
1589
1590 set:
1591 local->smps_mode = smps_mode;
1592 /* changed flag is auto-detected for this */
1593 ieee80211_hw_config(local, 0);
1594 }
1595
1596 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1597 {
1598 int i;
1599
1600 for (i = 0; i < n_ids; i++)
1601 if (ids[i] == id)
1602 return true;
1603 return false;
1604 }
1605
1606 /**
1607 * ieee80211_ie_split - split an IE buffer according to ordering
1608 *
1609 * @ies: the IE buffer
1610 * @ielen: the length of the IE buffer
1611 * @ids: an array with element IDs that are allowed before
1612 * the split
1613 * @n_ids: the size of the element ID array
1614 * @offset: offset where to start splitting in the buffer
1615 *
1616 * This function splits an IE buffer by updating the @offset
1617 * variable to point to the location where the buffer should be
1618 * split.
1619 *
1620 * It assumes that the given IE buffer is well-formed, this
1621 * has to be guaranteed by the caller!
1622 *
1623 * It also assumes that the IEs in the buffer are ordered
1624 * correctly, if not the result of using this function will not
1625 * be ordered correctly either, i.e. it does no reordering.
1626 *
1627 * The function returns the offset where the next part of the
1628 * buffer starts, which may be @ielen if the entire (remainder)
1629 * of the buffer should be used.
1630 */
1631 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1632 const u8 *ids, int n_ids, size_t offset)
1633 {
1634 size_t pos = offset;
1635
1636 while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1637 pos += 2 + ies[pos + 1];
1638
1639 return pos;
1640 }
1641
1642 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1643 {
1644 size_t pos = offset;
1645
1646 while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1647 pos += 2 + ies[pos + 1];
1648
1649 return pos;
1650 }
1651
1652 static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
1653 int rssi_min_thold,
1654 int rssi_max_thold)
1655 {
1656 trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);
1657
1658 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1659 return;
1660
1661 /*
1662 * Scale up threshold values before storing it, as the RSSI averaging
1663 * algorithm uses a scaled up value as well. Change this scaling
1664 * factor if the RSSI averaging algorithm changes.
1665 */
1666 sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
1667 sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
1668 }
1669
1670 void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
1671 int rssi_min_thold,
1672 int rssi_max_thold)
1673 {
1674 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1675
1676 WARN_ON(rssi_min_thold == rssi_max_thold ||
1677 rssi_min_thold > rssi_max_thold);
1678
1679 _ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
1680 rssi_max_thold);
1681 }
1682 EXPORT_SYMBOL(ieee80211_enable_rssi_reports);
1683
1684 void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
1685 {
1686 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1687
1688 _ieee80211_enable_rssi_reports(sdata, 0, 0);
1689 }
1690 EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
1691
1692 u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1693 u16 cap)
1694 {
1695 __le16 tmp;
1696
1697 *pos++ = WLAN_EID_HT_CAPABILITY;
1698 *pos++ = sizeof(struct ieee80211_ht_cap);
1699 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
1700
1701 /* capability flags */
1702 tmp = cpu_to_le16(cap);
1703 memcpy(pos, &tmp, sizeof(u16));
1704 pos += sizeof(u16);
1705
1706 /* AMPDU parameters */
1707 *pos++ = ht_cap->ampdu_factor |
1708 (ht_cap->ampdu_density <<
1709 IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
1710
1711 /* MCS set */
1712 memcpy(pos, &ht_cap->mcs, sizeof(ht_cap->mcs));
1713 pos += sizeof(ht_cap->mcs);
1714
1715 /* extended capabilities */
1716 pos += sizeof(__le16);
1717
1718 /* BF capabilities */
1719 pos += sizeof(__le32);
1720
1721 /* antenna selection */
1722 pos += sizeof(u8);
1723
1724 return pos;
1725 }
1726
1727 u8 *ieee80211_ie_build_vht_cap(u8 *pos, struct ieee80211_sta_vht_cap *vht_cap,
1728 u32 cap)
1729 {
1730 __le32 tmp;
1731
1732 *pos++ = WLAN_EID_VHT_CAPABILITY;
1733 *pos++ = sizeof(struct ieee80211_vht_capabilities);
1734 memset(pos, 0, sizeof(struct ieee80211_vht_capabilities));
1735
1736 /* capability flags */
1737 tmp = cpu_to_le32(cap);
1738 memcpy(pos, &tmp, sizeof(u32));
1739 pos += sizeof(u32);
1740
1741 /* VHT MCS set */
1742 memcpy(pos, &vht_cap->vht_mcs, sizeof(vht_cap->vht_mcs));
1743 pos += sizeof(vht_cap->vht_mcs);
1744
1745 return pos;
1746 }
1747
1748 u8 *ieee80211_ie_build_ht_oper(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1749 struct ieee80211_channel *channel,
1750 enum nl80211_channel_type channel_type,
1751 u16 prot_mode)
1752 {
1753 struct ieee80211_ht_operation *ht_oper;
1754 /* Build HT Information */
1755 *pos++ = WLAN_EID_HT_OPERATION;
1756 *pos++ = sizeof(struct ieee80211_ht_operation);
1757 ht_oper = (struct ieee80211_ht_operation *)pos;
1758 ht_oper->primary_chan =
1759 ieee80211_frequency_to_channel(channel->center_freq);
1760 switch (channel_type) {
1761 case NL80211_CHAN_HT40MINUS:
1762 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1763 break;
1764 case NL80211_CHAN_HT40PLUS:
1765 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
1766 break;
1767 case NL80211_CHAN_HT20:
1768 default:
1769 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
1770 break;
1771 }
1772 if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
1773 channel_type != NL80211_CHAN_NO_HT &&
1774 channel_type != NL80211_CHAN_HT20)
1775 ht_oper->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
1776
1777 ht_oper->operation_mode = cpu_to_le16(prot_mode);
1778 ht_oper->stbc_param = 0x0000;
1779
1780 /* It seems that Basic MCS set and Supported MCS set
1781 are identical for the first 10 bytes */
1782 memset(&ht_oper->basic_set, 0, 16);
1783 memcpy(&ht_oper->basic_set, &ht_cap->mcs, 10);
1784
1785 return pos + sizeof(struct ieee80211_ht_operation);
1786 }
1787
1788 enum nl80211_channel_type
1789 ieee80211_ht_oper_to_channel_type(struct ieee80211_ht_operation *ht_oper)
1790 {
1791 enum nl80211_channel_type channel_type;
1792
1793 if (!ht_oper)
1794 return NL80211_CHAN_NO_HT;
1795
1796 switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
1797 case IEEE80211_HT_PARAM_CHA_SEC_NONE:
1798 channel_type = NL80211_CHAN_HT20;
1799 break;
1800 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1801 channel_type = NL80211_CHAN_HT40PLUS;
1802 break;
1803 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1804 channel_type = NL80211_CHAN_HT40MINUS;
1805 break;
1806 default:
1807 channel_type = NL80211_CHAN_NO_HT;
1808 }
1809
1810 return channel_type;
1811 }
1812
1813 int ieee80211_add_srates_ie(struct ieee80211_sub_if_data *sdata,
1814 struct sk_buff *skb, bool need_basic,
1815 enum ieee80211_band band)
1816 {
1817 struct ieee80211_local *local = sdata->local;
1818 struct ieee80211_supported_band *sband;
1819 int rate;
1820 u8 i, rates, *pos;
1821 u32 basic_rates = sdata->vif.bss_conf.basic_rates;
1822
1823 sband = local->hw.wiphy->bands[band];
1824 rates = sband->n_bitrates;
1825 if (rates > 8)
1826 rates = 8;
1827
1828 if (skb_tailroom(skb) < rates + 2)
1829 return -ENOMEM;
1830
1831 pos = skb_put(skb, rates + 2);
1832 *pos++ = WLAN_EID_SUPP_RATES;
1833 *pos++ = rates;
1834 for (i = 0; i < rates; i++) {
1835 u8 basic = 0;
1836 if (need_basic && basic_rates & BIT(i))
1837 basic = 0x80;
1838 rate = sband->bitrates[i].bitrate;
1839 *pos++ = basic | (u8) (rate / 5);
1840 }
1841
1842 return 0;
1843 }
1844
1845 int ieee80211_add_ext_srates_ie(struct ieee80211_sub_if_data *sdata,
1846 struct sk_buff *skb, bool need_basic,
1847 enum ieee80211_band band)
1848 {
1849 struct ieee80211_local *local = sdata->local;
1850 struct ieee80211_supported_band *sband;
1851 int rate;
1852 u8 i, exrates, *pos;
1853 u32 basic_rates = sdata->vif.bss_conf.basic_rates;
1854
1855 sband = local->hw.wiphy->bands[band];
1856 exrates = sband->n_bitrates;
1857 if (exrates > 8)
1858 exrates -= 8;
1859 else
1860 exrates = 0;
1861
1862 if (skb_tailroom(skb) < exrates + 2)
1863 return -ENOMEM;
1864
1865 if (exrates) {
1866 pos = skb_put(skb, exrates + 2);
1867 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1868 *pos++ = exrates;
1869 for (i = 8; i < sband->n_bitrates; i++) {
1870 u8 basic = 0;
1871 if (need_basic && basic_rates & BIT(i))
1872 basic = 0x80;
1873 rate = sband->bitrates[i].bitrate;
1874 *pos++ = basic | (u8) (rate / 5);
1875 }
1876 }
1877 return 0;
1878 }
1879
1880 int ieee80211_ave_rssi(struct ieee80211_vif *vif)
1881 {
1882 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1883 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1884
1885 if (WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_STATION)) {
1886 /* non-managed type inferfaces */
1887 return 0;
1888 }
1889 return ifmgd->ave_beacon_signal;
1890 }
1891 EXPORT_SYMBOL_GPL(ieee80211_ave_rssi);
Linux kernel - Deliverables
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