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Merge branch 'tipc_net-next' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg...
[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 mutex_unlock(&local->iflist_mtx);
533 }
534 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
535
536 void ieee80211_iterate_active_interfaces_atomic(
537 struct ieee80211_hw *hw,
538 void (*iterator)(void *data, u8 *mac,
539 struct ieee80211_vif *vif),
540 void *data)
541 {
542 struct ieee80211_local *local = hw_to_local(hw);
543 struct ieee80211_sub_if_data *sdata;
544
545 rcu_read_lock();
546
547 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
548 switch (sdata->vif.type) {
549 case NL80211_IFTYPE_MONITOR:
550 case NL80211_IFTYPE_AP_VLAN:
551 continue;
552 default:
553 break;
554 }
555 if (ieee80211_sdata_running(sdata))
556 iterator(data, sdata->vif.addr,
557 &sdata->vif);
558 }
559
560 rcu_read_unlock();
561 }
562 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
563
564 /*
565 * Nothing should have been stuffed into the workqueue during
566 * the suspend->resume cycle. If this WARN is seen then there
567 * is a bug with either the driver suspend or something in
568 * mac80211 stuffing into the workqueue which we haven't yet
569 * cleared during mac80211's suspend cycle.
570 */
571 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
572 {
573 if (WARN(local->suspended && !local->resuming,
574 "queueing ieee80211 work while going to suspend\n"))
575 return false;
576
577 return true;
578 }
579
580 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
581 {
582 struct ieee80211_local *local = hw_to_local(hw);
583
584 if (!ieee80211_can_queue_work(local))
585 return;
586
587 queue_work(local->workqueue, work);
588 }
589 EXPORT_SYMBOL(ieee80211_queue_work);
590
591 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
592 struct delayed_work *dwork,
593 unsigned long delay)
594 {
595 struct ieee80211_local *local = hw_to_local(hw);
596
597 if (!ieee80211_can_queue_work(local))
598 return;
599
600 queue_delayed_work(local->workqueue, dwork, delay);
601 }
602 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
603
604 u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
605 struct ieee802_11_elems *elems,
606 u64 filter, u32 crc)
607 {
608 size_t left = len;
609 u8 *pos = start;
610 bool calc_crc = filter != 0;
611 DECLARE_BITMAP(seen_elems, 256);
612
613 bitmap_zero(seen_elems, 256);
614 memset(elems, 0, sizeof(*elems));
615 elems->ie_start = start;
616 elems->total_len = len;
617
618 while (left >= 2) {
619 u8 id, elen;
620 bool elem_parse_failed;
621
622 id = *pos++;
623 elen = *pos++;
624 left -= 2;
625
626 if (elen > left) {
627 elems->parse_error = true;
628 break;
629 }
630
631 if (id != WLAN_EID_VENDOR_SPECIFIC &&
632 id != WLAN_EID_QUIET &&
633 test_bit(id, seen_elems)) {
634 elems->parse_error = true;
635 left -= elen;
636 pos += elen;
637 continue;
638 }
639
640 if (calc_crc && id < 64 && (filter & (1ULL << id)))
641 crc = crc32_be(crc, pos - 2, elen + 2);
642
643 elem_parse_failed = false;
644
645 switch (id) {
646 case WLAN_EID_SSID:
647 elems->ssid = pos;
648 elems->ssid_len = elen;
649 break;
650 case WLAN_EID_SUPP_RATES:
651 elems->supp_rates = pos;
652 elems->supp_rates_len = elen;
653 break;
654 case WLAN_EID_FH_PARAMS:
655 elems->fh_params = pos;
656 elems->fh_params_len = elen;
657 break;
658 case WLAN_EID_DS_PARAMS:
659 elems->ds_params = pos;
660 elems->ds_params_len = elen;
661 break;
662 case WLAN_EID_CF_PARAMS:
663 elems->cf_params = pos;
664 elems->cf_params_len = elen;
665 break;
666 case WLAN_EID_TIM:
667 if (elen >= sizeof(struct ieee80211_tim_ie)) {
668 elems->tim = (void *)pos;
669 elems->tim_len = elen;
670 } else
671 elem_parse_failed = true;
672 break;
673 case WLAN_EID_IBSS_PARAMS:
674 elems->ibss_params = pos;
675 elems->ibss_params_len = elen;
676 break;
677 case WLAN_EID_CHALLENGE:
678 elems->challenge = pos;
679 elems->challenge_len = elen;
680 break;
681 case WLAN_EID_VENDOR_SPECIFIC:
682 if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
683 pos[2] == 0xf2) {
684 /* Microsoft OUI (00:50:F2) */
685
686 if (calc_crc)
687 crc = crc32_be(crc, pos - 2, elen + 2);
688
689 if (pos[3] == 1) {
690 /* OUI Type 1 - WPA IE */
691 elems->wpa = pos;
692 elems->wpa_len = elen;
693 } else if (elen >= 5 && pos[3] == 2) {
694 /* OUI Type 2 - WMM IE */
695 if (pos[4] == 0) {
696 elems->wmm_info = pos;
697 elems->wmm_info_len = elen;
698 } else if (pos[4] == 1) {
699 elems->wmm_param = pos;
700 elems->wmm_param_len = elen;
701 }
702 }
703 }
704 break;
705 case WLAN_EID_RSN:
706 elems->rsn = pos;
707 elems->rsn_len = elen;
708 break;
709 case WLAN_EID_ERP_INFO:
710 elems->erp_info = pos;
711 elems->erp_info_len = elen;
712 break;
713 case WLAN_EID_EXT_SUPP_RATES:
714 elems->ext_supp_rates = pos;
715 elems->ext_supp_rates_len = elen;
716 break;
717 case WLAN_EID_HT_CAPABILITY:
718 if (elen >= sizeof(struct ieee80211_ht_cap))
719 elems->ht_cap_elem = (void *)pos;
720 else
721 elem_parse_failed = true;
722 break;
723 case WLAN_EID_HT_OPERATION:
724 if (elen >= sizeof(struct ieee80211_ht_operation))
725 elems->ht_operation = (void *)pos;
726 else
727 elem_parse_failed = true;
728 break;
729 case WLAN_EID_MESH_ID:
730 elems->mesh_id = pos;
731 elems->mesh_id_len = elen;
732 break;
733 case WLAN_EID_MESH_CONFIG:
734 if (elen >= sizeof(struct ieee80211_meshconf_ie))
735 elems->mesh_config = (void *)pos;
736 else
737 elem_parse_failed = true;
738 break;
739 case WLAN_EID_PEER_MGMT:
740 elems->peering = pos;
741 elems->peering_len = elen;
742 break;
743 case WLAN_EID_PREQ:
744 elems->preq = pos;
745 elems->preq_len = elen;
746 break;
747 case WLAN_EID_PREP:
748 elems->prep = pos;
749 elems->prep_len = elen;
750 break;
751 case WLAN_EID_PERR:
752 elems->perr = pos;
753 elems->perr_len = elen;
754 break;
755 case WLAN_EID_RANN:
756 if (elen >= sizeof(struct ieee80211_rann_ie))
757 elems->rann = (void *)pos;
758 else
759 elem_parse_failed = true;
760 break;
761 case WLAN_EID_CHANNEL_SWITCH:
762 elems->ch_switch_elem = pos;
763 elems->ch_switch_elem_len = elen;
764 break;
765 case WLAN_EID_QUIET:
766 if (!elems->quiet_elem) {
767 elems->quiet_elem = pos;
768 elems->quiet_elem_len = elen;
769 }
770 elems->num_of_quiet_elem++;
771 break;
772 case WLAN_EID_COUNTRY:
773 elems->country_elem = pos;
774 elems->country_elem_len = elen;
775 break;
776 case WLAN_EID_PWR_CONSTRAINT:
777 elems->pwr_constr_elem = pos;
778 elems->pwr_constr_elem_len = elen;
779 break;
780 case WLAN_EID_TIMEOUT_INTERVAL:
781 elems->timeout_int = pos;
782 elems->timeout_int_len = elen;
783 break;
784 default:
785 break;
786 }
787
788 if (elem_parse_failed)
789 elems->parse_error = true;
790 else
791 set_bit(id, seen_elems);
792
793 left -= elen;
794 pos += elen;
795 }
796
797 if (left != 0)
798 elems->parse_error = true;
799
800 return crc;
801 }
802
803 void ieee802_11_parse_elems(u8 *start, size_t len,
804 struct ieee802_11_elems *elems)
805 {
806 ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
807 }
808
809 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata,
810 bool bss_notify)
811 {
812 struct ieee80211_local *local = sdata->local;
813 struct ieee80211_tx_queue_params qparam;
814 int ac;
815 bool use_11b, enable_qos;
816 int aCWmin, aCWmax;
817
818 if (!local->ops->conf_tx)
819 return;
820
821 if (local->hw.queues < IEEE80211_NUM_ACS)
822 return;
823
824 memset(&qparam, 0, sizeof(qparam));
825
826 use_11b = (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) &&
827 !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
828
829 /*
830 * By default disable QoS in STA mode for old access points, which do
831 * not support 802.11e. New APs will provide proper queue parameters,
832 * that we will configure later.
833 */
834 enable_qos = (sdata->vif.type != NL80211_IFTYPE_STATION);
835
836 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
837 /* Set defaults according to 802.11-2007 Table 7-37 */
838 aCWmax = 1023;
839 if (use_11b)
840 aCWmin = 31;
841 else
842 aCWmin = 15;
843
844 if (enable_qos) {
845 switch (ac) {
846 case IEEE80211_AC_BK:
847 qparam.cw_max = aCWmax;
848 qparam.cw_min = aCWmin;
849 qparam.txop = 0;
850 qparam.aifs = 7;
851 break;
852 /* never happens but let's not leave undefined */
853 default:
854 case IEEE80211_AC_BE:
855 qparam.cw_max = aCWmax;
856 qparam.cw_min = aCWmin;
857 qparam.txop = 0;
858 qparam.aifs = 3;
859 break;
860 case IEEE80211_AC_VI:
861 qparam.cw_max = aCWmin;
862 qparam.cw_min = (aCWmin + 1) / 2 - 1;
863 if (use_11b)
864 qparam.txop = 6016/32;
865 else
866 qparam.txop = 3008/32;
867 qparam.aifs = 2;
868 break;
869 case IEEE80211_AC_VO:
870 qparam.cw_max = (aCWmin + 1) / 2 - 1;
871 qparam.cw_min = (aCWmin + 1) / 4 - 1;
872 if (use_11b)
873 qparam.txop = 3264/32;
874 else
875 qparam.txop = 1504/32;
876 qparam.aifs = 2;
877 break;
878 }
879 } else {
880 /* Confiure old 802.11b/g medium access rules. */
881 qparam.cw_max = aCWmax;
882 qparam.cw_min = aCWmin;
883 qparam.txop = 0;
884 qparam.aifs = 2;
885 }
886
887 qparam.uapsd = false;
888
889 sdata->tx_conf[ac] = qparam;
890 drv_conf_tx(local, sdata, ac, &qparam);
891 }
892
893 if (sdata->vif.type != NL80211_IFTYPE_MONITOR) {
894 sdata->vif.bss_conf.qos = enable_qos;
895 if (bss_notify)
896 ieee80211_bss_info_change_notify(sdata,
897 BSS_CHANGED_QOS);
898 }
899 }
900
901 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
902 const size_t supp_rates_len,
903 const u8 *supp_rates)
904 {
905 struct ieee80211_local *local = sdata->local;
906 int i, have_higher_than_11mbit = 0;
907
908 /* cf. IEEE 802.11 9.2.12 */
909 for (i = 0; i < supp_rates_len; i++)
910 if ((supp_rates[i] & 0x7f) * 5 > 110)
911 have_higher_than_11mbit = 1;
912
913 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
914 have_higher_than_11mbit)
915 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
916 else
917 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
918
919 ieee80211_set_wmm_default(sdata, true);
920 }
921
922 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
923 enum ieee80211_band band)
924 {
925 struct ieee80211_supported_band *sband;
926 struct ieee80211_rate *bitrates;
927 u32 mandatory_rates;
928 enum ieee80211_rate_flags mandatory_flag;
929 int i;
930
931 sband = local->hw.wiphy->bands[band];
932 if (WARN_ON(!sband))
933 return 1;
934
935 if (band == IEEE80211_BAND_2GHZ)
936 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
937 else
938 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
939
940 bitrates = sband->bitrates;
941 mandatory_rates = 0;
942 for (i = 0; i < sband->n_bitrates; i++)
943 if (bitrates[i].flags & mandatory_flag)
944 mandatory_rates |= BIT(i);
945 return mandatory_rates;
946 }
947
948 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
949 u16 transaction, u16 auth_alg,
950 u8 *extra, size_t extra_len, const u8 *da,
951 const u8 *bssid, const u8 *key, u8 key_len, u8 key_idx)
952 {
953 struct ieee80211_local *local = sdata->local;
954 struct sk_buff *skb;
955 struct ieee80211_mgmt *mgmt;
956 int err;
957
958 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
959 sizeof(*mgmt) + 6 + extra_len);
960 if (!skb)
961 return;
962
963 skb_reserve(skb, local->hw.extra_tx_headroom);
964
965 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
966 memset(mgmt, 0, 24 + 6);
967 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
968 IEEE80211_STYPE_AUTH);
969 memcpy(mgmt->da, da, ETH_ALEN);
970 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
971 memcpy(mgmt->bssid, bssid, ETH_ALEN);
972 mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
973 mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
974 mgmt->u.auth.status_code = cpu_to_le16(0);
975 if (extra)
976 memcpy(skb_put(skb, extra_len), extra, extra_len);
977
978 if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
979 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
980 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
981 WARN_ON(err);
982 }
983
984 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
985 ieee80211_tx_skb(sdata, skb);
986 }
987
988 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
989 const u8 *ie, size_t ie_len,
990 enum ieee80211_band band, u32 rate_mask,
991 u8 channel)
992 {
993 struct ieee80211_supported_band *sband;
994 u8 *pos;
995 size_t offset = 0, noffset;
996 int supp_rates_len, i;
997 u8 rates[32];
998 int num_rates;
999 int ext_rates_len;
1000
1001 sband = local->hw.wiphy->bands[band];
1002
1003 pos = buffer;
1004
1005 num_rates = 0;
1006 for (i = 0; i < sband->n_bitrates; i++) {
1007 if ((BIT(i) & rate_mask) == 0)
1008 continue; /* skip rate */
1009 rates[num_rates++] = (u8) (sband->bitrates[i].bitrate / 5);
1010 }
1011
1012 supp_rates_len = min_t(int, num_rates, 8);
1013
1014 *pos++ = WLAN_EID_SUPP_RATES;
1015 *pos++ = supp_rates_len;
1016 memcpy(pos, rates, supp_rates_len);
1017 pos += supp_rates_len;
1018
1019 /* insert "request information" if in custom IEs */
1020 if (ie && ie_len) {
1021 static const u8 before_extrates[] = {
1022 WLAN_EID_SSID,
1023 WLAN_EID_SUPP_RATES,
1024 WLAN_EID_REQUEST,
1025 };
1026 noffset = ieee80211_ie_split(ie, ie_len,
1027 before_extrates,
1028 ARRAY_SIZE(before_extrates),
1029 offset);
1030 memcpy(pos, ie + offset, noffset - offset);
1031 pos += noffset - offset;
1032 offset = noffset;
1033 }
1034
1035 ext_rates_len = num_rates - supp_rates_len;
1036 if (ext_rates_len > 0) {
1037 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1038 *pos++ = ext_rates_len;
1039 memcpy(pos, rates + supp_rates_len, ext_rates_len);
1040 pos += ext_rates_len;
1041 }
1042
1043 if (channel && sband->band == IEEE80211_BAND_2GHZ) {
1044 *pos++ = WLAN_EID_DS_PARAMS;
1045 *pos++ = 1;
1046 *pos++ = channel;
1047 }
1048
1049 /* insert custom IEs that go before HT */
1050 if (ie && ie_len) {
1051 static const u8 before_ht[] = {
1052 WLAN_EID_SSID,
1053 WLAN_EID_SUPP_RATES,
1054 WLAN_EID_REQUEST,
1055 WLAN_EID_EXT_SUPP_RATES,
1056 WLAN_EID_DS_PARAMS,
1057 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1058 };
1059 noffset = ieee80211_ie_split(ie, ie_len,
1060 before_ht, ARRAY_SIZE(before_ht),
1061 offset);
1062 memcpy(pos, ie + offset, noffset - offset);
1063 pos += noffset - offset;
1064 offset = noffset;
1065 }
1066
1067 if (sband->ht_cap.ht_supported)
1068 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
1069 sband->ht_cap.cap);
1070
1071 /*
1072 * If adding more here, adjust code in main.c
1073 * that calculates local->scan_ies_len.
1074 */
1075
1076 /* add any remaining custom IEs */
1077 if (ie && ie_len) {
1078 noffset = ie_len;
1079 memcpy(pos, ie + offset, noffset - offset);
1080 pos += noffset - offset;
1081 }
1082
1083 if (sband->vht_cap.vht_supported)
1084 pos = ieee80211_ie_build_vht_cap(pos, &sband->vht_cap,
1085 sband->vht_cap.cap);
1086
1087 return pos - buffer;
1088 }
1089
1090 struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
1091 u8 *dst, u32 ratemask,
1092 const u8 *ssid, size_t ssid_len,
1093 const u8 *ie, size_t ie_len,
1094 bool directed)
1095 {
1096 struct ieee80211_local *local = sdata->local;
1097 struct sk_buff *skb;
1098 struct ieee80211_mgmt *mgmt;
1099 size_t buf_len;
1100 u8 *buf;
1101 u8 chan;
1102
1103 /* FIXME: come up with a proper value */
1104 buf = kmalloc(200 + ie_len, GFP_KERNEL);
1105 if (!buf)
1106 return NULL;
1107
1108 /*
1109 * Do not send DS Channel parameter for directed probe requests
1110 * in order to maximize the chance that we get a response. Some
1111 * badly-behaved APs don't respond when this parameter is included.
1112 */
1113 if (directed)
1114 chan = 0;
1115 else
1116 chan = ieee80211_frequency_to_channel(
1117 local->hw.conf.channel->center_freq);
1118
1119 buf_len = ieee80211_build_preq_ies(local, buf, ie, ie_len,
1120 local->hw.conf.channel->band,
1121 ratemask, chan);
1122
1123 skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
1124 ssid, ssid_len,
1125 buf, buf_len);
1126 if (!skb)
1127 goto out;
1128
1129 if (dst) {
1130 mgmt = (struct ieee80211_mgmt *) skb->data;
1131 memcpy(mgmt->da, dst, ETH_ALEN);
1132 memcpy(mgmt->bssid, dst, ETH_ALEN);
1133 }
1134
1135 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1136
1137 out:
1138 kfree(buf);
1139
1140 return skb;
1141 }
1142
1143 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1144 const u8 *ssid, size_t ssid_len,
1145 const u8 *ie, size_t ie_len,
1146 u32 ratemask, bool directed, bool no_cck)
1147 {
1148 struct sk_buff *skb;
1149
1150 skb = ieee80211_build_probe_req(sdata, dst, ratemask, ssid, ssid_len,
1151 ie, ie_len, directed);
1152 if (skb) {
1153 if (no_cck)
1154 IEEE80211_SKB_CB(skb)->flags |=
1155 IEEE80211_TX_CTL_NO_CCK_RATE;
1156 ieee80211_tx_skb(sdata, skb);
1157 }
1158 }
1159
1160 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
1161 struct ieee802_11_elems *elems,
1162 enum ieee80211_band band, u32 *basic_rates)
1163 {
1164 struct ieee80211_supported_band *sband;
1165 struct ieee80211_rate *bitrates;
1166 size_t num_rates;
1167 u32 supp_rates;
1168 int i, j;
1169 sband = local->hw.wiphy->bands[band];
1170
1171 if (WARN_ON(!sband))
1172 return 1;
1173
1174 bitrates = sband->bitrates;
1175 num_rates = sband->n_bitrates;
1176 supp_rates = 0;
1177 for (i = 0; i < elems->supp_rates_len +
1178 elems->ext_supp_rates_len; i++) {
1179 u8 rate = 0;
1180 int own_rate;
1181 bool is_basic;
1182 if (i < elems->supp_rates_len)
1183 rate = elems->supp_rates[i];
1184 else if (elems->ext_supp_rates)
1185 rate = elems->ext_supp_rates
1186 [i - elems->supp_rates_len];
1187 own_rate = 5 * (rate & 0x7f);
1188 is_basic = !!(rate & 0x80);
1189
1190 if (is_basic && (rate & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1191 continue;
1192
1193 for (j = 0; j < num_rates; j++) {
1194 if (bitrates[j].bitrate == own_rate) {
1195 supp_rates |= BIT(j);
1196 if (basic_rates && is_basic)
1197 *basic_rates |= BIT(j);
1198 }
1199 }
1200 }
1201 return supp_rates;
1202 }
1203
1204 void ieee80211_stop_device(struct ieee80211_local *local)
1205 {
1206 ieee80211_led_radio(local, false);
1207 ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
1208
1209 cancel_work_sync(&local->reconfig_filter);
1210
1211 flush_workqueue(local->workqueue);
1212 drv_stop(local);
1213 }
1214
1215 int ieee80211_reconfig(struct ieee80211_local *local)
1216 {
1217 struct ieee80211_hw *hw = &local->hw;
1218 struct ieee80211_sub_if_data *sdata;
1219 struct sta_info *sta;
1220 int res, i;
1221
1222 #ifdef CONFIG_PM
1223 if (local->suspended)
1224 local->resuming = true;
1225
1226 if (local->wowlan) {
1227 local->wowlan = false;
1228 res = drv_resume(local);
1229 if (res < 0) {
1230 local->resuming = false;
1231 return res;
1232 }
1233 if (res == 0)
1234 goto wake_up;
1235 WARN_ON(res > 1);
1236 /*
1237 * res is 1, which means the driver requested
1238 * to go through a regular reset on wakeup.
1239 */
1240 }
1241 #endif
1242 /* everything else happens only if HW was up & running */
1243 if (!local->open_count)
1244 goto wake_up;
1245
1246 /*
1247 * Upon resume hardware can sometimes be goofy due to
1248 * various platform / driver / bus issues, so restarting
1249 * the device may at times not work immediately. Propagate
1250 * the error.
1251 */
1252 res = drv_start(local);
1253 if (res) {
1254 WARN(local->suspended, "Hardware became unavailable "
1255 "upon resume. This could be a software issue "
1256 "prior to suspend or a hardware issue.\n");
1257 return res;
1258 }
1259
1260 /* setup fragmentation threshold */
1261 drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
1262
1263 /* setup RTS threshold */
1264 drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1265
1266 /* reset coverage class */
1267 drv_set_coverage_class(local, hw->wiphy->coverage_class);
1268
1269 ieee80211_led_radio(local, true);
1270 ieee80211_mod_tpt_led_trig(local,
1271 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1272
1273 /* add interfaces */
1274 sdata = rtnl_dereference(local->monitor_sdata);
1275 if (sdata) {
1276 res = drv_add_interface(local, sdata);
1277 if (WARN_ON(res)) {
1278 rcu_assign_pointer(local->monitor_sdata, NULL);
1279 synchronize_net();
1280 kfree(sdata);
1281 }
1282 }
1283
1284 list_for_each_entry(sdata, &local->interfaces, list) {
1285 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1286 sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1287 ieee80211_sdata_running(sdata))
1288 res = drv_add_interface(local, sdata);
1289 }
1290
1291 /* add STAs back */
1292 mutex_lock(&local->sta_mtx);
1293 list_for_each_entry(sta, &local->sta_list, list) {
1294 enum ieee80211_sta_state state;
1295
1296 if (!sta->uploaded)
1297 continue;
1298
1299 /* AP-mode stations will be added later */
1300 if (sta->sdata->vif.type == NL80211_IFTYPE_AP)
1301 continue;
1302
1303 for (state = IEEE80211_STA_NOTEXIST;
1304 state < sta->sta_state; state++)
1305 WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1306 state + 1));
1307 }
1308 mutex_unlock(&local->sta_mtx);
1309
1310 /* reconfigure tx conf */
1311 if (hw->queues >= IEEE80211_NUM_ACS) {
1312 list_for_each_entry(sdata, &local->interfaces, list) {
1313 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1314 sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1315 !ieee80211_sdata_running(sdata))
1316 continue;
1317
1318 for (i = 0; i < IEEE80211_NUM_ACS; i++)
1319 drv_conf_tx(local, sdata, i,
1320 &sdata->tx_conf[i]);
1321 }
1322 }
1323
1324 /* reconfigure hardware */
1325 ieee80211_hw_config(local, ~0);
1326
1327 ieee80211_configure_filter(local);
1328
1329 /* Finally also reconfigure all the BSS information */
1330 list_for_each_entry(sdata, &local->interfaces, list) {
1331 u32 changed;
1332
1333 if (!ieee80211_sdata_running(sdata))
1334 continue;
1335
1336 /* common change flags for all interface types */
1337 changed = BSS_CHANGED_ERP_CTS_PROT |
1338 BSS_CHANGED_ERP_PREAMBLE |
1339 BSS_CHANGED_ERP_SLOT |
1340 BSS_CHANGED_HT |
1341 BSS_CHANGED_BASIC_RATES |
1342 BSS_CHANGED_BEACON_INT |
1343 BSS_CHANGED_BSSID |
1344 BSS_CHANGED_CQM |
1345 BSS_CHANGED_QOS |
1346 BSS_CHANGED_IDLE;
1347
1348 switch (sdata->vif.type) {
1349 case NL80211_IFTYPE_STATION:
1350 changed |= BSS_CHANGED_ASSOC |
1351 BSS_CHANGED_ARP_FILTER;
1352 mutex_lock(&sdata->u.mgd.mtx);
1353 ieee80211_bss_info_change_notify(sdata, changed);
1354 mutex_unlock(&sdata->u.mgd.mtx);
1355 break;
1356 case NL80211_IFTYPE_ADHOC:
1357 changed |= BSS_CHANGED_IBSS;
1358 /* fall through */
1359 case NL80211_IFTYPE_AP:
1360 changed |= BSS_CHANGED_SSID;
1361
1362 if (sdata->vif.type == NL80211_IFTYPE_AP)
1363 changed |= BSS_CHANGED_AP_PROBE_RESP;
1364
1365 /* fall through */
1366 case NL80211_IFTYPE_MESH_POINT:
1367 changed |= BSS_CHANGED_BEACON |
1368 BSS_CHANGED_BEACON_ENABLED;
1369 ieee80211_bss_info_change_notify(sdata, changed);
1370 break;
1371 case NL80211_IFTYPE_WDS:
1372 break;
1373 case NL80211_IFTYPE_AP_VLAN:
1374 case NL80211_IFTYPE_MONITOR:
1375 /* ignore virtual */
1376 break;
1377 case NL80211_IFTYPE_UNSPECIFIED:
1378 case NUM_NL80211_IFTYPES:
1379 case NL80211_IFTYPE_P2P_CLIENT:
1380 case NL80211_IFTYPE_P2P_GO:
1381 WARN_ON(1);
1382 break;
1383 }
1384 }
1385
1386 ieee80211_recalc_ps(local, -1);
1387
1388 /*
1389 * The sta might be in psm against the ap (e.g. because
1390 * this was the state before a hw restart), so we
1391 * explicitly send a null packet in order to make sure
1392 * it'll sync against the ap (and get out of psm).
1393 */
1394 if (!(local->hw.conf.flags & IEEE80211_CONF_PS)) {
1395 list_for_each_entry(sdata, &local->interfaces, list) {
1396 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1397 continue;
1398
1399 ieee80211_send_nullfunc(local, sdata, 0);
1400 }
1401 }
1402
1403 /* APs are now beaconing, add back stations */
1404 mutex_lock(&local->sta_mtx);
1405 list_for_each_entry(sta, &local->sta_list, list) {
1406 enum ieee80211_sta_state state;
1407
1408 if (!sta->uploaded)
1409 continue;
1410
1411 if (sta->sdata->vif.type != NL80211_IFTYPE_AP)
1412 continue;
1413
1414 for (state = IEEE80211_STA_NOTEXIST;
1415 state < sta->sta_state; state++)
1416 WARN_ON(drv_sta_state(local, sta->sdata, sta, state,
1417 state + 1));
1418 }
1419 mutex_unlock(&local->sta_mtx);
1420
1421 /* add back keys */
1422 list_for_each_entry(sdata, &local->interfaces, list)
1423 if (ieee80211_sdata_running(sdata))
1424 ieee80211_enable_keys(sdata);
1425
1426 wake_up:
1427 local->in_reconfig = false;
1428 barrier();
1429
1430 /*
1431 * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
1432 * sessions can be established after a resume.
1433 *
1434 * Also tear down aggregation sessions since reconfiguring
1435 * them in a hardware restart scenario is not easily done
1436 * right now, and the hardware will have lost information
1437 * about the sessions, but we and the AP still think they
1438 * are active. This is really a workaround though.
1439 */
1440 if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1441 mutex_lock(&local->sta_mtx);
1442
1443 list_for_each_entry(sta, &local->sta_list, list) {
1444 ieee80211_sta_tear_down_BA_sessions(sta, true);
1445 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
1446 }
1447
1448 mutex_unlock(&local->sta_mtx);
1449 }
1450
1451 ieee80211_wake_queues_by_reason(hw,
1452 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1453
1454 /*
1455 * If this is for hw restart things are still running.
1456 * We may want to change that later, however.
1457 */
1458 if (!local->suspended)
1459 return 0;
1460
1461 #ifdef CONFIG_PM
1462 /* first set suspended false, then resuming */
1463 local->suspended = false;
1464 mb();
1465 local->resuming = false;
1466
1467 list_for_each_entry(sdata, &local->interfaces, list) {
1468 switch(sdata->vif.type) {
1469 case NL80211_IFTYPE_STATION:
1470 ieee80211_sta_restart(sdata);
1471 break;
1472 case NL80211_IFTYPE_ADHOC:
1473 ieee80211_ibss_restart(sdata);
1474 break;
1475 case NL80211_IFTYPE_MESH_POINT:
1476 ieee80211_mesh_restart(sdata);
1477 break;
1478 default:
1479 break;
1480 }
1481 }
1482
1483 mod_timer(&local->sta_cleanup, jiffies + 1);
1484
1485 mutex_lock(&local->sta_mtx);
1486 list_for_each_entry(sta, &local->sta_list, list)
1487 mesh_plink_restart(sta);
1488 mutex_unlock(&local->sta_mtx);
1489 #else
1490 WARN_ON(1);
1491 #endif
1492 return 0;
1493 }
1494
1495 void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
1496 {
1497 struct ieee80211_sub_if_data *sdata;
1498 struct ieee80211_local *local;
1499 struct ieee80211_key *key;
1500
1501 if (WARN_ON(!vif))
1502 return;
1503
1504 sdata = vif_to_sdata(vif);
1505 local = sdata->local;
1506
1507 if (WARN_ON(!local->resuming))
1508 return;
1509
1510 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1511 return;
1512
1513 sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;
1514
1515 mutex_lock(&local->key_mtx);
1516 list_for_each_entry(key, &sdata->key_list, list)
1517 key->flags |= KEY_FLAG_TAINTED;
1518 mutex_unlock(&local->key_mtx);
1519 }
1520 EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);
1521
1522 static int check_mgd_smps(struct ieee80211_if_managed *ifmgd,
1523 enum ieee80211_smps_mode *smps_mode)
1524 {
1525 if (ifmgd->associated) {
1526 *smps_mode = ifmgd->ap_smps;
1527
1528 if (*smps_mode == IEEE80211_SMPS_AUTOMATIC) {
1529 if (ifmgd->powersave)
1530 *smps_mode = IEEE80211_SMPS_DYNAMIC;
1531 else
1532 *smps_mode = IEEE80211_SMPS_OFF;
1533 }
1534
1535 return 1;
1536 }
1537
1538 return 0;
1539 }
1540
1541 /* must hold iflist_mtx */
1542 void ieee80211_recalc_smps(struct ieee80211_local *local)
1543 {
1544 struct ieee80211_sub_if_data *sdata;
1545 enum ieee80211_smps_mode smps_mode = IEEE80211_SMPS_OFF;
1546 int count = 0;
1547
1548 lockdep_assert_held(&local->iflist_mtx);
1549
1550 /*
1551 * This function could be improved to handle multiple
1552 * interfaces better, but right now it makes any
1553 * non-station interfaces force SM PS to be turned
1554 * off. If there are multiple station interfaces it
1555 * could also use the best possible mode, e.g. if
1556 * one is in static and the other in dynamic then
1557 * dynamic is ok.
1558 */
1559
1560 list_for_each_entry(sdata, &local->interfaces, list) {
1561 if (!ieee80211_sdata_running(sdata))
1562 continue;
1563 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1564 goto set;
1565
1566 count += check_mgd_smps(&sdata->u.mgd, &smps_mode);
1567
1568 if (count > 1) {
1569 smps_mode = IEEE80211_SMPS_OFF;
1570 break;
1571 }
1572 }
1573
1574 if (smps_mode == local->smps_mode)
1575 return;
1576
1577 set:
1578 local->smps_mode = smps_mode;
1579 /* changed flag is auto-detected for this */
1580 ieee80211_hw_config(local, 0);
1581 }
1582
1583 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1584 {
1585 int i;
1586
1587 for (i = 0; i < n_ids; i++)
1588 if (ids[i] == id)
1589 return true;
1590 return false;
1591 }
1592
1593 /**
1594 * ieee80211_ie_split - split an IE buffer according to ordering
1595 *
1596 * @ies: the IE buffer
1597 * @ielen: the length of the IE buffer
1598 * @ids: an array with element IDs that are allowed before
1599 * the split
1600 * @n_ids: the size of the element ID array
1601 * @offset: offset where to start splitting in the buffer
1602 *
1603 * This function splits an IE buffer by updating the @offset
1604 * variable to point to the location where the buffer should be
1605 * split.
1606 *
1607 * It assumes that the given IE buffer is well-formed, this
1608 * has to be guaranteed by the caller!
1609 *
1610 * It also assumes that the IEs in the buffer are ordered
1611 * correctly, if not the result of using this function will not
1612 * be ordered correctly either, i.e. it does no reordering.
1613 *
1614 * The function returns the offset where the next part of the
1615 * buffer starts, which may be @ielen if the entire (remainder)
1616 * of the buffer should be used.
1617 */
1618 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1619 const u8 *ids, int n_ids, size_t offset)
1620 {
1621 size_t pos = offset;
1622
1623 while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1624 pos += 2 + ies[pos + 1];
1625
1626 return pos;
1627 }
1628
1629 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1630 {
1631 size_t pos = offset;
1632
1633 while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1634 pos += 2 + ies[pos + 1];
1635
1636 return pos;
1637 }
1638
1639 static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
1640 int rssi_min_thold,
1641 int rssi_max_thold)
1642 {
1643 trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);
1644
1645 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1646 return;
1647
1648 /*
1649 * Scale up threshold values before storing it, as the RSSI averaging
1650 * algorithm uses a scaled up value as well. Change this scaling
1651 * factor if the RSSI averaging algorithm changes.
1652 */
1653 sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
1654 sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
1655 }
1656
1657 void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
1658 int rssi_min_thold,
1659 int rssi_max_thold)
1660 {
1661 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1662
1663 WARN_ON(rssi_min_thold == rssi_max_thold ||
1664 rssi_min_thold > rssi_max_thold);
1665
1666 _ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
1667 rssi_max_thold);
1668 }
1669 EXPORT_SYMBOL(ieee80211_enable_rssi_reports);
1670
1671 void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
1672 {
1673 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1674
1675 _ieee80211_enable_rssi_reports(sdata, 0, 0);
1676 }
1677 EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
1678
1679 u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1680 u16 cap)
1681 {
1682 __le16 tmp;
1683
1684 *pos++ = WLAN_EID_HT_CAPABILITY;
1685 *pos++ = sizeof(struct ieee80211_ht_cap);
1686 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
1687
1688 /* capability flags */
1689 tmp = cpu_to_le16(cap);
1690 memcpy(pos, &tmp, sizeof(u16));
1691 pos += sizeof(u16);
1692
1693 /* AMPDU parameters */
1694 *pos++ = ht_cap->ampdu_factor |
1695 (ht_cap->ampdu_density <<
1696 IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
1697
1698 /* MCS set */
1699 memcpy(pos, &ht_cap->mcs, sizeof(ht_cap->mcs));
1700 pos += sizeof(ht_cap->mcs);
1701
1702 /* extended capabilities */
1703 pos += sizeof(__le16);
1704
1705 /* BF capabilities */
1706 pos += sizeof(__le32);
1707
1708 /* antenna selection */
1709 pos += sizeof(u8);
1710
1711 return pos;
1712 }
1713
1714 u8 *ieee80211_ie_build_vht_cap(u8 *pos, struct ieee80211_sta_vht_cap *vht_cap,
1715 u32 cap)
1716 {
1717 __le32 tmp;
1718
1719 *pos++ = WLAN_EID_VHT_CAPABILITY;
1720 *pos++ = sizeof(struct ieee80211_vht_capabilities);
1721 memset(pos, 0, sizeof(struct ieee80211_vht_capabilities));
1722
1723 /* capability flags */
1724 tmp = cpu_to_le32(cap);
1725 memcpy(pos, &tmp, sizeof(u32));
1726 pos += sizeof(u32);
1727
1728 /* VHT MCS set */
1729 memcpy(pos, &vht_cap->vht_mcs, sizeof(vht_cap->vht_mcs));
1730 pos += sizeof(vht_cap->vht_mcs);
1731
1732 return pos;
1733 }
1734
1735 u8 *ieee80211_ie_build_ht_oper(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1736 struct ieee80211_channel *channel,
1737 enum nl80211_channel_type channel_type,
1738 u16 prot_mode)
1739 {
1740 struct ieee80211_ht_operation *ht_oper;
1741 /* Build HT Information */
1742 *pos++ = WLAN_EID_HT_OPERATION;
1743 *pos++ = sizeof(struct ieee80211_ht_operation);
1744 ht_oper = (struct ieee80211_ht_operation *)pos;
1745 ht_oper->primary_chan =
1746 ieee80211_frequency_to_channel(channel->center_freq);
1747 switch (channel_type) {
1748 case NL80211_CHAN_HT40MINUS:
1749 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1750 break;
1751 case NL80211_CHAN_HT40PLUS:
1752 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
1753 break;
1754 case NL80211_CHAN_HT20:
1755 default:
1756 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
1757 break;
1758 }
1759 if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
1760 channel_type != NL80211_CHAN_NO_HT &&
1761 channel_type != NL80211_CHAN_HT20)
1762 ht_oper->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
1763
1764 ht_oper->operation_mode = cpu_to_le16(prot_mode);
1765 ht_oper->stbc_param = 0x0000;
1766
1767 /* It seems that Basic MCS set and Supported MCS set
1768 are identical for the first 10 bytes */
1769 memset(&ht_oper->basic_set, 0, 16);
1770 memcpy(&ht_oper->basic_set, &ht_cap->mcs, 10);
1771
1772 return pos + sizeof(struct ieee80211_ht_operation);
1773 }
1774
1775 enum nl80211_channel_type
1776 ieee80211_ht_oper_to_channel_type(struct ieee80211_ht_operation *ht_oper)
1777 {
1778 enum nl80211_channel_type channel_type;
1779
1780 if (!ht_oper)
1781 return NL80211_CHAN_NO_HT;
1782
1783 switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
1784 case IEEE80211_HT_PARAM_CHA_SEC_NONE:
1785 channel_type = NL80211_CHAN_HT20;
1786 break;
1787 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1788 channel_type = NL80211_CHAN_HT40PLUS;
1789 break;
1790 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1791 channel_type = NL80211_CHAN_HT40MINUS;
1792 break;
1793 default:
1794 channel_type = NL80211_CHAN_NO_HT;
1795 }
1796
1797 return channel_type;
1798 }
1799
1800 int ieee80211_add_srates_ie(struct ieee80211_sub_if_data *sdata,
1801 struct sk_buff *skb, bool need_basic)
1802 {
1803 struct ieee80211_local *local = sdata->local;
1804 struct ieee80211_supported_band *sband;
1805 int rate;
1806 u8 i, rates, *pos;
1807 u32 basic_rates = sdata->vif.bss_conf.basic_rates;
1808
1809 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1810 rates = sband->n_bitrates;
1811 if (rates > 8)
1812 rates = 8;
1813
1814 if (skb_tailroom(skb) < rates + 2)
1815 return -ENOMEM;
1816
1817 pos = skb_put(skb, rates + 2);
1818 *pos++ = WLAN_EID_SUPP_RATES;
1819 *pos++ = rates;
1820 for (i = 0; i < rates; i++) {
1821 u8 basic = 0;
1822 if (need_basic && basic_rates & BIT(i))
1823 basic = 0x80;
1824 rate = sband->bitrates[i].bitrate;
1825 *pos++ = basic | (u8) (rate / 5);
1826 }
1827
1828 return 0;
1829 }
1830
1831 int ieee80211_add_ext_srates_ie(struct ieee80211_sub_if_data *sdata,
1832 struct sk_buff *skb, bool need_basic)
1833 {
1834 struct ieee80211_local *local = sdata->local;
1835 struct ieee80211_supported_band *sband;
1836 int rate;
1837 u8 i, exrates, *pos;
1838 u32 basic_rates = sdata->vif.bss_conf.basic_rates;
1839
1840 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1841 exrates = sband->n_bitrates;
1842 if (exrates > 8)
1843 exrates -= 8;
1844 else
1845 exrates = 0;
1846
1847 if (skb_tailroom(skb) < exrates + 2)
1848 return -ENOMEM;
1849
1850 if (exrates) {
1851 pos = skb_put(skb, exrates + 2);
1852 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1853 *pos++ = exrates;
1854 for (i = 8; i < sband->n_bitrates; i++) {
1855 u8 basic = 0;
1856 if (need_basic && basic_rates & BIT(i))
1857 basic = 0x80;
1858 rate = sband->bitrates[i].bitrate;
1859 *pos++ = basic | (u8) (rate / 5);
1860 }
1861 }
1862 return 0;
1863 }
1864
1865 int ieee80211_ave_rssi(struct ieee80211_vif *vif)
1866 {
1867 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1868 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1869
1870 if (WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_STATION)) {
1871 /* non-managed type inferfaces */
1872 return 0;
1873 }
1874 return ifmgd->ave_beacon_signal;
1875 }
1876 EXPORT_SYMBOL_GPL(ieee80211_ave_rssi);
Linux kernel - Deliverables
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