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asm-generic: add linux/types.h to cmpxchg.h
[linux-2.6.git] / net / mac80211 / util.c
blob32f7a3b3d43ce0f4232ef890f004af5186dceb51
1 /*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 * utilities for mac80211
12 */
13
14 #include <net/mac80211.h>
15 #include <linux/netdevice.h>
16 #include <linux/export.h>
17 #include <linux/types.h>
18 #include <linux/slab.h>
19 #include <linux/skbuff.h>
20 #include <linux/etherdevice.h>
21 #include <linux/if_arp.h>
22 #include <linux/bitmap.h>
23 #include <linux/crc32.h>
24 #include <net/net_namespace.h>
25 #include <net/cfg80211.h>
26 #include <net/rtnetlink.h>
27
28 #include "ieee80211_i.h"
29 #include "driver-ops.h"
30 #include "rate.h"
31 #include "mesh.h"
32 #include "wme.h"
33 #include "led.h"
34 #include "wep.h"
35
36 /* privid for wiphys to determine whether they belong to us or not */
37 void *mac80211_wiphy_privid = &mac80211_wiphy_privid;
38
39 struct ieee80211_hw *wiphy_to_ieee80211_hw(struct wiphy *wiphy)
40 {
41 struct ieee80211_local *local;
42 BUG_ON(!wiphy);
43
44 local = wiphy_priv(wiphy);
45 return &local->hw;
46 }
47 EXPORT_SYMBOL(wiphy_to_ieee80211_hw);
48
49 u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
50 enum nl80211_iftype type)
51 {
52 __le16 fc = hdr->frame_control;
53
54 /* drop ACK/CTS frames and incorrect hdr len (ctrl) */
55 if (len < 16)
56 return NULL;
57
58 if (ieee80211_is_data(fc)) {
59 if (len < 24) /* drop incorrect hdr len (data) */
60 return NULL;
61
62 if (ieee80211_has_a4(fc))
63 return NULL;
64 if (ieee80211_has_tods(fc))
65 return hdr->addr1;
66 if (ieee80211_has_fromds(fc))
67 return hdr->addr2;
68
69 return hdr->addr3;
70 }
71
72 if (ieee80211_is_mgmt(fc)) {
73 if (len < 24) /* drop incorrect hdr len (mgmt) */
74 return NULL;
75 return hdr->addr3;
76 }
77
78 if (ieee80211_is_ctl(fc)) {
79 if(ieee80211_is_pspoll(fc))
80 return hdr->addr1;
81
82 if (ieee80211_is_back_req(fc)) {
83 switch (type) {
84 case NL80211_IFTYPE_STATION:
85 return hdr->addr2;
86 case NL80211_IFTYPE_AP:
87 case NL80211_IFTYPE_AP_VLAN:
88 return hdr->addr1;
89 default:
90 break; /* fall through to the return */
91 }
92 }
93 }
94
95 return NULL;
96 }
97
98 void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
99 {
100 struct sk_buff *skb;
101 struct ieee80211_hdr *hdr;
102
103 skb_queue_walk(&tx->skbs, skb) {
104 hdr = (struct ieee80211_hdr *) skb->data;
105 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
106 }
107 }
108
109 int ieee80211_frame_duration(struct ieee80211_local *local, size_t len,
110 int rate, int erp, int short_preamble)
111 {
112 int dur;
113
114 /* calculate duration (in microseconds, rounded up to next higher
115 * integer if it includes a fractional microsecond) to send frame of
116 * len bytes (does not include FCS) at the given rate. Duration will
117 * also include SIFS.
118 *
119 * rate is in 100 kbps, so divident is multiplied by 10 in the
120 * DIV_ROUND_UP() operations.
121 */
122
123 if (local->hw.conf.channel->band == IEEE80211_BAND_5GHZ || erp) {
124 /*
125 * OFDM:
126 *
127 * N_DBPS = DATARATE x 4
128 * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
129 * (16 = SIGNAL time, 6 = tail bits)
130 * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
131 *
132 * T_SYM = 4 usec
133 * 802.11a - 17.5.2: aSIFSTime = 16 usec
134 * 802.11g - 19.8.4: aSIFSTime = 10 usec +
135 * signal ext = 6 usec
136 */
137 dur = 16; /* SIFS + signal ext */
138 dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */
139 dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */
140 dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
141 4 * rate); /* T_SYM x N_SYM */
142 } else {
143 /*
144 * 802.11b or 802.11g with 802.11b compatibility:
145 * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
146 * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
147 *
148 * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
149 * aSIFSTime = 10 usec
150 * aPreambleLength = 144 usec or 72 usec with short preamble
151 * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
152 */
153 dur = 10; /* aSIFSTime = 10 usec */
154 dur += short_preamble ? (72 + 24) : (144 + 48);
155
156 dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
157 }
158
159 return dur;
160 }
161
162 /* Exported duration function for driver use */
163 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
164 struct ieee80211_vif *vif,
165 size_t frame_len,
166 struct ieee80211_rate *rate)
167 {
168 struct ieee80211_local *local = hw_to_local(hw);
169 struct ieee80211_sub_if_data *sdata;
170 u16 dur;
171 int erp;
172 bool short_preamble = false;
173
174 erp = 0;
175 if (vif) {
176 sdata = vif_to_sdata(vif);
177 short_preamble = sdata->vif.bss_conf.use_short_preamble;
178 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
179 erp = rate->flags & IEEE80211_RATE_ERP_G;
180 }
181
182 dur = ieee80211_frame_duration(local, frame_len, rate->bitrate, erp,
183 short_preamble);
184
185 return cpu_to_le16(dur);
186 }
187 EXPORT_SYMBOL(ieee80211_generic_frame_duration);
188
189 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
190 struct ieee80211_vif *vif, size_t frame_len,
191 const struct ieee80211_tx_info *frame_txctl)
192 {
193 struct ieee80211_local *local = hw_to_local(hw);
194 struct ieee80211_rate *rate;
195 struct ieee80211_sub_if_data *sdata;
196 bool short_preamble;
197 int erp;
198 u16 dur;
199 struct ieee80211_supported_band *sband;
200
201 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
202
203 short_preamble = false;
204
205 rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
206
207 erp = 0;
208 if (vif) {
209 sdata = vif_to_sdata(vif);
210 short_preamble = sdata->vif.bss_conf.use_short_preamble;
211 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
212 erp = rate->flags & IEEE80211_RATE_ERP_G;
213 }
214
215 /* CTS duration */
216 dur = ieee80211_frame_duration(local, 10, rate->bitrate,
217 erp, short_preamble);
218 /* Data frame duration */
219 dur += ieee80211_frame_duration(local, frame_len, rate->bitrate,
220 erp, short_preamble);
221 /* ACK duration */
222 dur += ieee80211_frame_duration(local, 10, rate->bitrate,
223 erp, short_preamble);
224
225 return cpu_to_le16(dur);
226 }
227 EXPORT_SYMBOL(ieee80211_rts_duration);
228
229 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
230 struct ieee80211_vif *vif,
231 size_t frame_len,
232 const struct ieee80211_tx_info *frame_txctl)
233 {
234 struct ieee80211_local *local = hw_to_local(hw);
235 struct ieee80211_rate *rate;
236 struct ieee80211_sub_if_data *sdata;
237 bool short_preamble;
238 int erp;
239 u16 dur;
240 struct ieee80211_supported_band *sband;
241
242 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
243
244 short_preamble = false;
245
246 rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
247 erp = 0;
248 if (vif) {
249 sdata = vif_to_sdata(vif);
250 short_preamble = sdata->vif.bss_conf.use_short_preamble;
251 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
252 erp = rate->flags & IEEE80211_RATE_ERP_G;
253 }
254
255 /* Data frame duration */
256 dur = ieee80211_frame_duration(local, frame_len, rate->bitrate,
257 erp, short_preamble);
258 if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
259 /* ACK duration */
260 dur += ieee80211_frame_duration(local, 10, rate->bitrate,
261 erp, short_preamble);
262 }
263
264 return cpu_to_le16(dur);
265 }
266 EXPORT_SYMBOL(ieee80211_ctstoself_duration);
267
268 static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
269 enum queue_stop_reason reason)
270 {
271 struct ieee80211_local *local = hw_to_local(hw);
272 struct ieee80211_sub_if_data *sdata;
273
274 trace_wake_queue(local, queue, reason);
275
276 if (WARN_ON(queue >= hw->queues))
277 return;
278
279 __clear_bit(reason, &local->queue_stop_reasons[queue]);
280
281 if (local->queue_stop_reasons[queue] != 0)
282 /* someone still has this queue stopped */
283 return;
284
285 if (skb_queue_empty(&local->pending[queue])) {
286 rcu_read_lock();
287 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
288 if (test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))
289 continue;
290 netif_wake_subqueue(sdata->dev, queue);
291 }
292 rcu_read_unlock();
293 } else
294 tasklet_schedule(&local->tx_pending_tasklet);
295 }
296
297 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
298 enum queue_stop_reason reason)
299 {
300 struct ieee80211_local *local = hw_to_local(hw);
301 unsigned long flags;
302
303 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
304 __ieee80211_wake_queue(hw, queue, reason);
305 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
306 }
307
308 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
309 {
310 ieee80211_wake_queue_by_reason(hw, queue,
311 IEEE80211_QUEUE_STOP_REASON_DRIVER);
312 }
313 EXPORT_SYMBOL(ieee80211_wake_queue);
314
315 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
316 enum queue_stop_reason reason)
317 {
318 struct ieee80211_local *local = hw_to_local(hw);
319 struct ieee80211_sub_if_data *sdata;
320
321 trace_stop_queue(local, queue, reason);
322
323 if (WARN_ON(queue >= hw->queues))
324 return;
325
326 __set_bit(reason, &local->queue_stop_reasons[queue]);
327
328 rcu_read_lock();
329 list_for_each_entry_rcu(sdata, &local->interfaces, list)
330 netif_stop_subqueue(sdata->dev, queue);
331 rcu_read_unlock();
332 }
333
334 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
335 enum queue_stop_reason reason)
336 {
337 struct ieee80211_local *local = hw_to_local(hw);
338 unsigned long flags;
339
340 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
341 __ieee80211_stop_queue(hw, queue, reason);
342 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
343 }
344
345 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
346 {
347 ieee80211_stop_queue_by_reason(hw, queue,
348 IEEE80211_QUEUE_STOP_REASON_DRIVER);
349 }
350 EXPORT_SYMBOL(ieee80211_stop_queue);
351
352 void ieee80211_add_pending_skb(struct ieee80211_local *local,
353 struct sk_buff *skb)
354 {
355 struct ieee80211_hw *hw = &local->hw;
356 unsigned long flags;
357 int queue = skb_get_queue_mapping(skb);
358 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
359
360 if (WARN_ON(!info->control.vif)) {
361 kfree_skb(skb);
362 return;
363 }
364
365 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
366 __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
367 __skb_queue_tail(&local->pending[queue], skb);
368 __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
369 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
370 }
371
372 void ieee80211_add_pending_skbs_fn(struct ieee80211_local *local,
373 struct sk_buff_head *skbs,
374 void (*fn)(void *data), void *data)
375 {
376 struct ieee80211_hw *hw = &local->hw;
377 struct sk_buff *skb;
378 unsigned long flags;
379 int queue, i;
380
381 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
382 for (i = 0; i < hw->queues; i++)
383 __ieee80211_stop_queue(hw, i,
384 IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
385
386 while ((skb = skb_dequeue(skbs))) {
387 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
388
389 if (WARN_ON(!info->control.vif)) {
390 kfree_skb(skb);
391 continue;
392 }
393
394 queue = skb_get_queue_mapping(skb);
395 __skb_queue_tail(&local->pending[queue], skb);
396 }
397
398 if (fn)
399 fn(data);
400
401 for (i = 0; i < hw->queues; i++)
402 __ieee80211_wake_queue(hw, i,
403 IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
404 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
405 }
406
407 void ieee80211_add_pending_skbs(struct ieee80211_local *local,
408 struct sk_buff_head *skbs)
409 {
410 ieee80211_add_pending_skbs_fn(local, skbs, NULL, NULL);
411 }
412
413 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
414 enum queue_stop_reason reason)
415 {
416 struct ieee80211_local *local = hw_to_local(hw);
417 unsigned long flags;
418 int i;
419
420 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
421
422 for (i = 0; i < hw->queues; i++)
423 __ieee80211_stop_queue(hw, i, reason);
424
425 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
426 }
427
428 void ieee80211_stop_queues(struct ieee80211_hw *hw)
429 {
430 ieee80211_stop_queues_by_reason(hw,
431 IEEE80211_QUEUE_STOP_REASON_DRIVER);
432 }
433 EXPORT_SYMBOL(ieee80211_stop_queues);
434
435 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
436 {
437 struct ieee80211_local *local = hw_to_local(hw);
438 unsigned long flags;
439 int ret;
440
441 if (WARN_ON(queue >= hw->queues))
442 return true;
443
444 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
445 ret = !!local->queue_stop_reasons[queue];
446 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
447 return ret;
448 }
449 EXPORT_SYMBOL(ieee80211_queue_stopped);
450
451 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
452 enum queue_stop_reason reason)
453 {
454 struct ieee80211_local *local = hw_to_local(hw);
455 unsigned long flags;
456 int i;
457
458 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
459
460 for (i = 0; i < hw->queues; i++)
461 __ieee80211_wake_queue(hw, i, reason);
462
463 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
464 }
465
466 void ieee80211_wake_queues(struct ieee80211_hw *hw)
467 {
468 ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
469 }
470 EXPORT_SYMBOL(ieee80211_wake_queues);
471
472 void ieee80211_iterate_active_interfaces(
473 struct ieee80211_hw *hw,
474 void (*iterator)(void *data, u8 *mac,
475 struct ieee80211_vif *vif),
476 void *data)
477 {
478 struct ieee80211_local *local = hw_to_local(hw);
479 struct ieee80211_sub_if_data *sdata;
480
481 mutex_lock(&local->iflist_mtx);
482
483 list_for_each_entry(sdata, &local->interfaces, list) {
484 switch (sdata->vif.type) {
485 case NL80211_IFTYPE_MONITOR:
486 case NL80211_IFTYPE_AP_VLAN:
487 continue;
488 default:
489 break;
490 }
491 if (ieee80211_sdata_running(sdata))
492 iterator(data, sdata->vif.addr,
493 &sdata->vif);
494 }
495
496 mutex_unlock(&local->iflist_mtx);
497 }
498 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
499
500 void ieee80211_iterate_active_interfaces_atomic(
501 struct ieee80211_hw *hw,
502 void (*iterator)(void *data, u8 *mac,
503 struct ieee80211_vif *vif),
504 void *data)
505 {
506 struct ieee80211_local *local = hw_to_local(hw);
507 struct ieee80211_sub_if_data *sdata;
508
509 rcu_read_lock();
510
511 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
512 switch (sdata->vif.type) {
513 case NL80211_IFTYPE_MONITOR:
514 case NL80211_IFTYPE_AP_VLAN:
515 continue;
516 default:
517 break;
518 }
519 if (ieee80211_sdata_running(sdata))
520 iterator(data, sdata->vif.addr,
521 &sdata->vif);
522 }
523
524 rcu_read_unlock();
525 }
526 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
527
528 /*
529 * Nothing should have been stuffed into the workqueue during
530 * the suspend->resume cycle. If this WARN is seen then there
531 * is a bug with either the driver suspend or something in
532 * mac80211 stuffing into the workqueue which we haven't yet
533 * cleared during mac80211's suspend cycle.
534 */
535 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
536 {
537 if (WARN(local->suspended && !local->resuming,
538 "queueing ieee80211 work while going to suspend\n"))
539 return false;
540
541 return true;
542 }
543
544 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
545 {
546 struct ieee80211_local *local = hw_to_local(hw);
547
548 if (!ieee80211_can_queue_work(local))
549 return;
550
551 queue_work(local->workqueue, work);
552 }
553 EXPORT_SYMBOL(ieee80211_queue_work);
554
555 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
556 struct delayed_work *dwork,
557 unsigned long delay)
558 {
559 struct ieee80211_local *local = hw_to_local(hw);
560
561 if (!ieee80211_can_queue_work(local))
562 return;
563
564 queue_delayed_work(local->workqueue, dwork, delay);
565 }
566 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
567
568 u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
569 struct ieee802_11_elems *elems,
570 u64 filter, u32 crc)
571 {
572 size_t left = len;
573 u8 *pos = start;
574 bool calc_crc = filter != 0;
575 DECLARE_BITMAP(seen_elems, 256);
576
577 bitmap_zero(seen_elems, 256);
578 memset(elems, 0, sizeof(*elems));
579 elems->ie_start = start;
580 elems->total_len = len;
581
582 while (left >= 2) {
583 u8 id, elen;
584 bool elem_parse_failed;
585
586 id = *pos++;
587 elen = *pos++;
588 left -= 2;
589
590 if (elen > left) {
591 elems->parse_error = true;
592 break;
593 }
594
595 if (id != WLAN_EID_VENDOR_SPECIFIC &&
596 id != WLAN_EID_QUIET &&
597 test_bit(id, seen_elems)) {
598 elems->parse_error = true;
599 left -= elen;
600 pos += elen;
601 continue;
602 }
603
604 if (calc_crc && id < 64 && (filter & (1ULL << id)))
605 crc = crc32_be(crc, pos - 2, elen + 2);
606
607 elem_parse_failed = false;
608
609 switch (id) {
610 case WLAN_EID_SSID:
611 elems->ssid = pos;
612 elems->ssid_len = elen;
613 break;
614 case WLAN_EID_SUPP_RATES:
615 elems->supp_rates = pos;
616 elems->supp_rates_len = elen;
617 break;
618 case WLAN_EID_FH_PARAMS:
619 elems->fh_params = pos;
620 elems->fh_params_len = elen;
621 break;
622 case WLAN_EID_DS_PARAMS:
623 elems->ds_params = pos;
624 elems->ds_params_len = elen;
625 break;
626 case WLAN_EID_CF_PARAMS:
627 elems->cf_params = pos;
628 elems->cf_params_len = elen;
629 break;
630 case WLAN_EID_TIM:
631 if (elen >= sizeof(struct ieee80211_tim_ie)) {
632 elems->tim = (void *)pos;
633 elems->tim_len = elen;
634 } else
635 elem_parse_failed = true;
636 break;
637 case WLAN_EID_IBSS_PARAMS:
638 elems->ibss_params = pos;
639 elems->ibss_params_len = elen;
640 break;
641 case WLAN_EID_CHALLENGE:
642 elems->challenge = pos;
643 elems->challenge_len = elen;
644 break;
645 case WLAN_EID_VENDOR_SPECIFIC:
646 if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
647 pos[2] == 0xf2) {
648 /* Microsoft OUI (00:50:F2) */
649
650 if (calc_crc)
651 crc = crc32_be(crc, pos - 2, elen + 2);
652
653 if (pos[3] == 1) {
654 /* OUI Type 1 - WPA IE */
655 elems->wpa = pos;
656 elems->wpa_len = elen;
657 } else if (elen >= 5 && pos[3] == 2) {
658 /* OUI Type 2 - WMM IE */
659 if (pos[4] == 0) {
660 elems->wmm_info = pos;
661 elems->wmm_info_len = elen;
662 } else if (pos[4] == 1) {
663 elems->wmm_param = pos;
664 elems->wmm_param_len = elen;
665 }
666 }
667 }
668 break;
669 case WLAN_EID_RSN:
670 elems->rsn = pos;
671 elems->rsn_len = elen;
672 break;
673 case WLAN_EID_ERP_INFO:
674 elems->erp_info = pos;
675 elems->erp_info_len = elen;
676 break;
677 case WLAN_EID_EXT_SUPP_RATES:
678 elems->ext_supp_rates = pos;
679 elems->ext_supp_rates_len = elen;
680 break;
681 case WLAN_EID_HT_CAPABILITY:
682 if (elen >= sizeof(struct ieee80211_ht_cap))
683 elems->ht_cap_elem = (void *)pos;
684 else
685 elem_parse_failed = true;
686 break;
687 case WLAN_EID_HT_INFORMATION:
688 if (elen >= sizeof(struct ieee80211_ht_info))
689 elems->ht_info_elem = (void *)pos;
690 else
691 elem_parse_failed = true;
692 break;
693 case WLAN_EID_MESH_ID:
694 elems->mesh_id = pos;
695 elems->mesh_id_len = elen;
696 break;
697 case WLAN_EID_MESH_CONFIG:
698 if (elen >= sizeof(struct ieee80211_meshconf_ie))
699 elems->mesh_config = (void *)pos;
700 else
701 elem_parse_failed = true;
702 break;
703 case WLAN_EID_PEER_MGMT:
704 elems->peering = pos;
705 elems->peering_len = elen;
706 break;
707 case WLAN_EID_PREQ:
708 elems->preq = pos;
709 elems->preq_len = elen;
710 break;
711 case WLAN_EID_PREP:
712 elems->prep = pos;
713 elems->prep_len = elen;
714 break;
715 case WLAN_EID_PERR:
716 elems->perr = pos;
717 elems->perr_len = elen;
718 break;
719 case WLAN_EID_RANN:
720 if (elen >= sizeof(struct ieee80211_rann_ie))
721 elems->rann = (void *)pos;
722 else
723 elem_parse_failed = true;
724 break;
725 case WLAN_EID_CHANNEL_SWITCH:
726 elems->ch_switch_elem = pos;
727 elems->ch_switch_elem_len = elen;
728 break;
729 case WLAN_EID_QUIET:
730 if (!elems->quiet_elem) {
731 elems->quiet_elem = pos;
732 elems->quiet_elem_len = elen;
733 }
734 elems->num_of_quiet_elem++;
735 break;
736 case WLAN_EID_COUNTRY:
737 elems->country_elem = pos;
738 elems->country_elem_len = elen;
739 break;
740 case WLAN_EID_PWR_CONSTRAINT:
741 elems->pwr_constr_elem = pos;
742 elems->pwr_constr_elem_len = elen;
743 break;
744 case WLAN_EID_TIMEOUT_INTERVAL:
745 elems->timeout_int = pos;
746 elems->timeout_int_len = elen;
747 break;
748 default:
749 break;
750 }
751
752 if (elem_parse_failed)
753 elems->parse_error = true;
754 else
755 set_bit(id, seen_elems);
756
757 left -= elen;
758 pos += elen;
759 }
760
761 if (left != 0)
762 elems->parse_error = true;
763
764 return crc;
765 }
766
767 void ieee802_11_parse_elems(u8 *start, size_t len,
768 struct ieee802_11_elems *elems)
769 {
770 ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
771 }
772
773 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata,
774 bool bss_notify)
775 {
776 struct ieee80211_local *local = sdata->local;
777 struct ieee80211_tx_queue_params qparam;
778 int queue;
779 bool use_11b;
780 int aCWmin, aCWmax;
781
782 if (!local->ops->conf_tx)
783 return;
784
785 memset(&qparam, 0, sizeof(qparam));
786
787 use_11b = (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) &&
788 !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
789
790 for (queue = 0; queue < local->hw.queues; queue++) {
791 /* Set defaults according to 802.11-2007 Table 7-37 */
792 aCWmax = 1023;
793 if (use_11b)
794 aCWmin = 31;
795 else
796 aCWmin = 15;
797
798 switch (queue) {
799 case 3: /* AC_BK */
800 qparam.cw_max = aCWmax;
801 qparam.cw_min = aCWmin;
802 qparam.txop = 0;
803 qparam.aifs = 7;
804 break;
805 default: /* never happens but let's not leave undefined */
806 case 2: /* AC_BE */
807 qparam.cw_max = aCWmax;
808 qparam.cw_min = aCWmin;
809 qparam.txop = 0;
810 qparam.aifs = 3;
811 break;
812 case 1: /* AC_VI */
813 qparam.cw_max = aCWmin;
814 qparam.cw_min = (aCWmin + 1) / 2 - 1;
815 if (use_11b)
816 qparam.txop = 6016/32;
817 else
818 qparam.txop = 3008/32;
819 qparam.aifs = 2;
820 break;
821 case 0: /* AC_VO */
822 qparam.cw_max = (aCWmin + 1) / 2 - 1;
823 qparam.cw_min = (aCWmin + 1) / 4 - 1;
824 if (use_11b)
825 qparam.txop = 3264/32;
826 else
827 qparam.txop = 1504/32;
828 qparam.aifs = 2;
829 break;
830 }
831
832 qparam.uapsd = false;
833
834 sdata->tx_conf[queue] = qparam;
835 drv_conf_tx(local, sdata, queue, &qparam);
836 }
837
838 /* after reinitialize QoS TX queues setting to default,
839 * disable QoS at all */
840
841 if (sdata->vif.type != NL80211_IFTYPE_MONITOR) {
842 sdata->vif.bss_conf.qos =
843 sdata->vif.type != NL80211_IFTYPE_STATION;
844 if (bss_notify)
845 ieee80211_bss_info_change_notify(sdata,
846 BSS_CHANGED_QOS);
847 }
848 }
849
850 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
851 const size_t supp_rates_len,
852 const u8 *supp_rates)
853 {
854 struct ieee80211_local *local = sdata->local;
855 int i, have_higher_than_11mbit = 0;
856
857 /* cf. IEEE 802.11 9.2.12 */
858 for (i = 0; i < supp_rates_len; i++)
859 if ((supp_rates[i] & 0x7f) * 5 > 110)
860 have_higher_than_11mbit = 1;
861
862 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
863 have_higher_than_11mbit)
864 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
865 else
866 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
867
868 ieee80211_set_wmm_default(sdata, true);
869 }
870
871 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
872 enum ieee80211_band band)
873 {
874 struct ieee80211_supported_band *sband;
875 struct ieee80211_rate *bitrates;
876 u32 mandatory_rates;
877 enum ieee80211_rate_flags mandatory_flag;
878 int i;
879
880 sband = local->hw.wiphy->bands[band];
881 if (!sband) {
882 WARN_ON(1);
883 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
884 }
885
886 if (band == IEEE80211_BAND_2GHZ)
887 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
888 else
889 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
890
891 bitrates = sband->bitrates;
892 mandatory_rates = 0;
893 for (i = 0; i < sband->n_bitrates; i++)
894 if (bitrates[i].flags & mandatory_flag)
895 mandatory_rates |= BIT(i);
896 return mandatory_rates;
897 }
898
899 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
900 u16 transaction, u16 auth_alg,
901 u8 *extra, size_t extra_len, const u8 *da,
902 const u8 *bssid, const u8 *key, u8 key_len, u8 key_idx)
903 {
904 struct ieee80211_local *local = sdata->local;
905 struct sk_buff *skb;
906 struct ieee80211_mgmt *mgmt;
907 int err;
908
909 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
910 sizeof(*mgmt) + 6 + extra_len);
911 if (!skb)
912 return;
913
914 skb_reserve(skb, local->hw.extra_tx_headroom);
915
916 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
917 memset(mgmt, 0, 24 + 6);
918 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
919 IEEE80211_STYPE_AUTH);
920 memcpy(mgmt->da, da, ETH_ALEN);
921 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
922 memcpy(mgmt->bssid, bssid, ETH_ALEN);
923 mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
924 mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
925 mgmt->u.auth.status_code = cpu_to_le16(0);
926 if (extra)
927 memcpy(skb_put(skb, extra_len), extra, extra_len);
928
929 if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
930 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
931 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
932 WARN_ON(err);
933 }
934
935 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
936 ieee80211_tx_skb(sdata, skb);
937 }
938
939 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
940 const u8 *ie, size_t ie_len,
941 enum ieee80211_band band, u32 rate_mask,
942 u8 channel)
943 {
944 struct ieee80211_supported_band *sband;
945 u8 *pos;
946 size_t offset = 0, noffset;
947 int supp_rates_len, i;
948 u8 rates[32];
949 int num_rates;
950 int ext_rates_len;
951
952 sband = local->hw.wiphy->bands[band];
953
954 pos = buffer;
955
956 num_rates = 0;
957 for (i = 0; i < sband->n_bitrates; i++) {
958 if ((BIT(i) & rate_mask) == 0)
959 continue; /* skip rate */
960 rates[num_rates++] = (u8) (sband->bitrates[i].bitrate / 5);
961 }
962
963 supp_rates_len = min_t(int, num_rates, 8);
964
965 *pos++ = WLAN_EID_SUPP_RATES;
966 *pos++ = supp_rates_len;
967 memcpy(pos, rates, supp_rates_len);
968 pos += supp_rates_len;
969
970 /* insert "request information" if in custom IEs */
971 if (ie && ie_len) {
972 static const u8 before_extrates[] = {
973 WLAN_EID_SSID,
974 WLAN_EID_SUPP_RATES,
975 WLAN_EID_REQUEST,
976 };
977 noffset = ieee80211_ie_split(ie, ie_len,
978 before_extrates,
979 ARRAY_SIZE(before_extrates),
980 offset);
981 memcpy(pos, ie + offset, noffset - offset);
982 pos += noffset - offset;
983 offset = noffset;
984 }
985
986 ext_rates_len = num_rates - supp_rates_len;
987 if (ext_rates_len > 0) {
988 *pos++ = WLAN_EID_EXT_SUPP_RATES;
989 *pos++ = ext_rates_len;
990 memcpy(pos, rates + supp_rates_len, ext_rates_len);
991 pos += ext_rates_len;
992 }
993
994 if (channel && sband->band == IEEE80211_BAND_2GHZ) {
995 *pos++ = WLAN_EID_DS_PARAMS;
996 *pos++ = 1;
997 *pos++ = channel;
998 }
999
1000 /* insert custom IEs that go before HT */
1001 if (ie && ie_len) {
1002 static const u8 before_ht[] = {
1003 WLAN_EID_SSID,
1004 WLAN_EID_SUPP_RATES,
1005 WLAN_EID_REQUEST,
1006 WLAN_EID_EXT_SUPP_RATES,
1007 WLAN_EID_DS_PARAMS,
1008 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1009 };
1010 noffset = ieee80211_ie_split(ie, ie_len,
1011 before_ht, ARRAY_SIZE(before_ht),
1012 offset);
1013 memcpy(pos, ie + offset, noffset - offset);
1014 pos += noffset - offset;
1015 offset = noffset;
1016 }
1017
1018 if (sband->ht_cap.ht_supported)
1019 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
1020 sband->ht_cap.cap);
1021
1022 /*
1023 * If adding more here, adjust code in main.c
1024 * that calculates local->scan_ies_len.
1025 */
1026
1027 /* add any remaining custom IEs */
1028 if (ie && ie_len) {
1029 noffset = ie_len;
1030 memcpy(pos, ie + offset, noffset - offset);
1031 pos += noffset - offset;
1032 }
1033
1034 return pos - buffer;
1035 }
1036
1037 struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
1038 u8 *dst, u32 ratemask,
1039 const u8 *ssid, size_t ssid_len,
1040 const u8 *ie, size_t ie_len,
1041 bool directed)
1042 {
1043 struct ieee80211_local *local = sdata->local;
1044 struct sk_buff *skb;
1045 struct ieee80211_mgmt *mgmt;
1046 size_t buf_len;
1047 u8 *buf;
1048 u8 chan;
1049
1050 /* FIXME: come up with a proper value */
1051 buf = kmalloc(200 + ie_len, GFP_KERNEL);
1052 if (!buf)
1053 return NULL;
1054
1055 /*
1056 * Do not send DS Channel parameter for directed probe requests
1057 * in order to maximize the chance that we get a response. Some
1058 * badly-behaved APs don't respond when this parameter is included.
1059 */
1060 if (directed)
1061 chan = 0;
1062 else
1063 chan = ieee80211_frequency_to_channel(
1064 local->hw.conf.channel->center_freq);
1065
1066 buf_len = ieee80211_build_preq_ies(local, buf, ie, ie_len,
1067 local->hw.conf.channel->band,
1068 ratemask, chan);
1069
1070 skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
1071 ssid, ssid_len,
1072 buf, buf_len);
1073 if (!skb)
1074 goto out;
1075
1076 if (dst) {
1077 mgmt = (struct ieee80211_mgmt *) skb->data;
1078 memcpy(mgmt->da, dst, ETH_ALEN);
1079 memcpy(mgmt->bssid, dst, ETH_ALEN);
1080 }
1081
1082 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1083
1084 out:
1085 kfree(buf);
1086
1087 return skb;
1088 }
1089
1090 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1091 const u8 *ssid, size_t ssid_len,
1092 const u8 *ie, size_t ie_len,
1093 u32 ratemask, bool directed, bool no_cck)
1094 {
1095 struct sk_buff *skb;
1096
1097 skb = ieee80211_build_probe_req(sdata, dst, ratemask, ssid, ssid_len,
1098 ie, ie_len, directed);
1099 if (skb) {
1100 if (no_cck)
1101 IEEE80211_SKB_CB(skb)->flags |=
1102 IEEE80211_TX_CTL_NO_CCK_RATE;
1103 ieee80211_tx_skb(sdata, skb);
1104 }
1105 }
1106
1107 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
1108 struct ieee802_11_elems *elems,
1109 enum ieee80211_band band)
1110 {
1111 struct ieee80211_supported_band *sband;
1112 struct ieee80211_rate *bitrates;
1113 size_t num_rates;
1114 u32 supp_rates;
1115 int i, j;
1116 sband = local->hw.wiphy->bands[band];
1117
1118 if (!sband) {
1119 WARN_ON(1);
1120 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1121 }
1122
1123 bitrates = sband->bitrates;
1124 num_rates = sband->n_bitrates;
1125 supp_rates = 0;
1126 for (i = 0; i < elems->supp_rates_len +
1127 elems->ext_supp_rates_len; i++) {
1128 u8 rate = 0;
1129 int own_rate;
1130 if (i < elems->supp_rates_len)
1131 rate = elems->supp_rates[i];
1132 else if (elems->ext_supp_rates)
1133 rate = elems->ext_supp_rates
1134 [i - elems->supp_rates_len];
1135 own_rate = 5 * (rate & 0x7f);
1136 for (j = 0; j < num_rates; j++)
1137 if (bitrates[j].bitrate == own_rate)
1138 supp_rates |= BIT(j);
1139 }
1140 return supp_rates;
1141 }
1142
1143 void ieee80211_stop_device(struct ieee80211_local *local)
1144 {
1145 ieee80211_led_radio(local, false);
1146 ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
1147
1148 cancel_work_sync(&local->reconfig_filter);
1149
1150 flush_workqueue(local->workqueue);
1151 drv_stop(local);
1152 }
1153
1154 int ieee80211_reconfig(struct ieee80211_local *local)
1155 {
1156 struct ieee80211_hw *hw = &local->hw;
1157 struct ieee80211_sub_if_data *sdata;
1158 struct sta_info *sta;
1159 int res, i;
1160
1161 #ifdef CONFIG_PM
1162 if (local->suspended)
1163 local->resuming = true;
1164
1165 if (local->wowlan) {
1166 local->wowlan = false;
1167 res = drv_resume(local);
1168 if (res < 0) {
1169 local->resuming = false;
1170 return res;
1171 }
1172 if (res == 0)
1173 goto wake_up;
1174 WARN_ON(res > 1);
1175 /*
1176 * res is 1, which means the driver requested
1177 * to go through a regular reset on wakeup.
1178 */
1179 }
1180 #endif
1181 /* everything else happens only if HW was up & running */
1182 if (!local->open_count)
1183 goto wake_up;
1184
1185 /*
1186 * Upon resume hardware can sometimes be goofy due to
1187 * various platform / driver / bus issues, so restarting
1188 * the device may at times not work immediately. Propagate
1189 * the error.
1190 */
1191 res = drv_start(local);
1192 if (res) {
1193 WARN(local->suspended, "Hardware became unavailable "
1194 "upon resume. This could be a software issue "
1195 "prior to suspend or a hardware issue.\n");
1196 return res;
1197 }
1198
1199 /* setup fragmentation threshold */
1200 drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
1201
1202 /* setup RTS threshold */
1203 drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1204
1205 /* reset coverage class */
1206 drv_set_coverage_class(local, hw->wiphy->coverage_class);
1207
1208 ieee80211_led_radio(local, true);
1209 ieee80211_mod_tpt_led_trig(local,
1210 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1211
1212 /* add interfaces */
1213 list_for_each_entry(sdata, &local->interfaces, list) {
1214 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1215 sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1216 ieee80211_sdata_running(sdata))
1217 res = drv_add_interface(local, sdata);
1218 }
1219
1220 /* add STAs back */
1221 mutex_lock(&local->sta_mtx);
1222 list_for_each_entry(sta, &local->sta_list, list) {
1223 if (sta->uploaded) {
1224 enum ieee80211_sta_state state;
1225
1226 for (state = IEEE80211_STA_NOTEXIST;
1227 state < sta->sta_state - 1; state++)
1228 WARN_ON(drv_sta_state(local, sta->sdata, sta,
1229 state, state + 1));
1230 }
1231 }
1232 mutex_unlock(&local->sta_mtx);
1233
1234 /* reconfigure tx conf */
1235 list_for_each_entry(sdata, &local->interfaces, list) {
1236 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1237 sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1238 !ieee80211_sdata_running(sdata))
1239 continue;
1240
1241 for (i = 0; i < hw->queues; i++)
1242 drv_conf_tx(local, sdata, i, &sdata->tx_conf[i]);
1243 }
1244
1245 /* reconfigure hardware */
1246 ieee80211_hw_config(local, ~0);
1247
1248 ieee80211_configure_filter(local);
1249
1250 /* Finally also reconfigure all the BSS information */
1251 list_for_each_entry(sdata, &local->interfaces, list) {
1252 u32 changed;
1253
1254 if (!ieee80211_sdata_running(sdata))
1255 continue;
1256
1257 /* common change flags for all interface types */
1258 changed = BSS_CHANGED_ERP_CTS_PROT |
1259 BSS_CHANGED_ERP_PREAMBLE |
1260 BSS_CHANGED_ERP_SLOT |
1261 BSS_CHANGED_HT |
1262 BSS_CHANGED_BASIC_RATES |
1263 BSS_CHANGED_BEACON_INT |
1264 BSS_CHANGED_BSSID |
1265 BSS_CHANGED_CQM |
1266 BSS_CHANGED_QOS |
1267 BSS_CHANGED_IDLE;
1268
1269 switch (sdata->vif.type) {
1270 case NL80211_IFTYPE_STATION:
1271 changed |= BSS_CHANGED_ASSOC |
1272 BSS_CHANGED_ARP_FILTER;
1273 mutex_lock(&sdata->u.mgd.mtx);
1274 ieee80211_bss_info_change_notify(sdata, changed);
1275 mutex_unlock(&sdata->u.mgd.mtx);
1276 break;
1277 case NL80211_IFTYPE_ADHOC:
1278 changed |= BSS_CHANGED_IBSS;
1279 /* fall through */
1280 case NL80211_IFTYPE_AP:
1281 changed |= BSS_CHANGED_SSID;
1282
1283 if (sdata->vif.type == NL80211_IFTYPE_AP)
1284 changed |= BSS_CHANGED_AP_PROBE_RESP;
1285
1286 /* fall through */
1287 case NL80211_IFTYPE_MESH_POINT:
1288 changed |= BSS_CHANGED_BEACON |
1289 BSS_CHANGED_BEACON_ENABLED;
1290 ieee80211_bss_info_change_notify(sdata, changed);
1291 break;
1292 case NL80211_IFTYPE_WDS:
1293 break;
1294 case NL80211_IFTYPE_AP_VLAN:
1295 case NL80211_IFTYPE_MONITOR:
1296 /* ignore virtual */
1297 break;
1298 case NL80211_IFTYPE_UNSPECIFIED:
1299 case NUM_NL80211_IFTYPES:
1300 case NL80211_IFTYPE_P2P_CLIENT:
1301 case NL80211_IFTYPE_P2P_GO:
1302 WARN_ON(1);
1303 break;
1304 }
1305 }
1306
1307 ieee80211_recalc_ps(local, -1);
1308
1309 /*
1310 * The sta might be in psm against the ap (e.g. because
1311 * this was the state before a hw restart), so we
1312 * explicitly send a null packet in order to make sure
1313 * it'll sync against the ap (and get out of psm).
1314 */
1315 if (!(local->hw.conf.flags & IEEE80211_CONF_PS)) {
1316 list_for_each_entry(sdata, &local->interfaces, list) {
1317 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1318 continue;
1319
1320 ieee80211_send_nullfunc(local, sdata, 0);
1321 }
1322 }
1323
1324 /*
1325 * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
1326 * sessions can be established after a resume.
1327 *
1328 * Also tear down aggregation sessions since reconfiguring
1329 * them in a hardware restart scenario is not easily done
1330 * right now, and the hardware will have lost information
1331 * about the sessions, but we and the AP still think they
1332 * are active. This is really a workaround though.
1333 */
1334 if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1335 mutex_lock(&local->sta_mtx);
1336
1337 list_for_each_entry(sta, &local->sta_list, list) {
1338 ieee80211_sta_tear_down_BA_sessions(sta, true);
1339 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
1340 }
1341
1342 mutex_unlock(&local->sta_mtx);
1343 }
1344
1345 /* add back keys */
1346 list_for_each_entry(sdata, &local->interfaces, list)
1347 if (ieee80211_sdata_running(sdata))
1348 ieee80211_enable_keys(sdata);
1349
1350 wake_up:
1351 ieee80211_wake_queues_by_reason(hw,
1352 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1353
1354 /*
1355 * If this is for hw restart things are still running.
1356 * We may want to change that later, however.
1357 */
1358 if (!local->suspended)
1359 return 0;
1360
1361 #ifdef CONFIG_PM
1362 /* first set suspended false, then resuming */
1363 local->suspended = false;
1364 mb();
1365 local->resuming = false;
1366
1367 list_for_each_entry(sdata, &local->interfaces, list) {
1368 switch(sdata->vif.type) {
1369 case NL80211_IFTYPE_STATION:
1370 ieee80211_sta_restart(sdata);
1371 break;
1372 case NL80211_IFTYPE_ADHOC:
1373 ieee80211_ibss_restart(sdata);
1374 break;
1375 case NL80211_IFTYPE_MESH_POINT:
1376 ieee80211_mesh_restart(sdata);
1377 break;
1378 default:
1379 break;
1380 }
1381 }
1382
1383 mod_timer(&local->sta_cleanup, jiffies + 1);
1384
1385 mutex_lock(&local->sta_mtx);
1386 list_for_each_entry(sta, &local->sta_list, list)
1387 mesh_plink_restart(sta);
1388 mutex_unlock(&local->sta_mtx);
1389 #else
1390 WARN_ON(1);
1391 #endif
1392 return 0;
1393 }
1394
1395 void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
1396 {
1397 struct ieee80211_sub_if_data *sdata;
1398 struct ieee80211_local *local;
1399 struct ieee80211_key *key;
1400
1401 if (WARN_ON(!vif))
1402 return;
1403
1404 sdata = vif_to_sdata(vif);
1405 local = sdata->local;
1406
1407 if (WARN_ON(!local->resuming))
1408 return;
1409
1410 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1411 return;
1412
1413 sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;
1414
1415 mutex_lock(&local->key_mtx);
1416 list_for_each_entry(key, &sdata->key_list, list)
1417 key->flags |= KEY_FLAG_TAINTED;
1418 mutex_unlock(&local->key_mtx);
1419 }
1420 EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);
1421
1422 static int check_mgd_smps(struct ieee80211_if_managed *ifmgd,
1423 enum ieee80211_smps_mode *smps_mode)
1424 {
1425 if (ifmgd->associated) {
1426 *smps_mode = ifmgd->ap_smps;
1427
1428 if (*smps_mode == IEEE80211_SMPS_AUTOMATIC) {
1429 if (ifmgd->powersave)
1430 *smps_mode = IEEE80211_SMPS_DYNAMIC;
1431 else
1432 *smps_mode = IEEE80211_SMPS_OFF;
1433 }
1434
1435 return 1;
1436 }
1437
1438 return 0;
1439 }
1440
1441 /* must hold iflist_mtx */
1442 void ieee80211_recalc_smps(struct ieee80211_local *local)
1443 {
1444 struct ieee80211_sub_if_data *sdata;
1445 enum ieee80211_smps_mode smps_mode = IEEE80211_SMPS_OFF;
1446 int count = 0;
1447
1448 lockdep_assert_held(&local->iflist_mtx);
1449
1450 /*
1451 * This function could be improved to handle multiple
1452 * interfaces better, but right now it makes any
1453 * non-station interfaces force SM PS to be turned
1454 * off. If there are multiple station interfaces it
1455 * could also use the best possible mode, e.g. if
1456 * one is in static and the other in dynamic then
1457 * dynamic is ok.
1458 */
1459
1460 list_for_each_entry(sdata, &local->interfaces, list) {
1461 if (!ieee80211_sdata_running(sdata))
1462 continue;
1463 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1464 goto set;
1465
1466 count += check_mgd_smps(&sdata->u.mgd, &smps_mode);
1467
1468 if (count > 1) {
1469 smps_mode = IEEE80211_SMPS_OFF;
1470 break;
1471 }
1472 }
1473
1474 if (smps_mode == local->smps_mode)
1475 return;
1476
1477 set:
1478 local->smps_mode = smps_mode;
1479 /* changed flag is auto-detected for this */
1480 ieee80211_hw_config(local, 0);
1481 }
1482
1483 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1484 {
1485 int i;
1486
1487 for (i = 0; i < n_ids; i++)
1488 if (ids[i] == id)
1489 return true;
1490 return false;
1491 }
1492
1493 /**
1494 * ieee80211_ie_split - split an IE buffer according to ordering
1495 *
1496 * @ies: the IE buffer
1497 * @ielen: the length of the IE buffer
1498 * @ids: an array with element IDs that are allowed before
1499 * the split
1500 * @n_ids: the size of the element ID array
1501 * @offset: offset where to start splitting in the buffer
1502 *
1503 * This function splits an IE buffer by updating the @offset
1504 * variable to point to the location where the buffer should be
1505 * split.
1506 *
1507 * It assumes that the given IE buffer is well-formed, this
1508 * has to be guaranteed by the caller!
1509 *
1510 * It also assumes that the IEs in the buffer are ordered
1511 * correctly, if not the result of using this function will not
1512 * be ordered correctly either, i.e. it does no reordering.
1513 *
1514 * The function returns the offset where the next part of the
1515 * buffer starts, which may be @ielen if the entire (remainder)
1516 * of the buffer should be used.
1517 */
1518 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1519 const u8 *ids, int n_ids, size_t offset)
1520 {
1521 size_t pos = offset;
1522
1523 while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1524 pos += 2 + ies[pos + 1];
1525
1526 return pos;
1527 }
1528
1529 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1530 {
1531 size_t pos = offset;
1532
1533 while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1534 pos += 2 + ies[pos + 1];
1535
1536 return pos;
1537 }
1538
1539 static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
1540 int rssi_min_thold,
1541 int rssi_max_thold)
1542 {
1543 trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);
1544
1545 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1546 return;
1547
1548 /*
1549 * Scale up threshold values before storing it, as the RSSI averaging
1550 * algorithm uses a scaled up value as well. Change this scaling
1551 * factor if the RSSI averaging algorithm changes.
1552 */
1553 sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
1554 sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
1555 }
1556
1557 void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
1558 int rssi_min_thold,
1559 int rssi_max_thold)
1560 {
1561 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1562
1563 WARN_ON(rssi_min_thold == rssi_max_thold ||
1564 rssi_min_thold > rssi_max_thold);
1565
1566 _ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
1567 rssi_max_thold);
1568 }
1569 EXPORT_SYMBOL(ieee80211_enable_rssi_reports);
1570
1571 void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
1572 {
1573 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1574
1575 _ieee80211_enable_rssi_reports(sdata, 0, 0);
1576 }
1577 EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
1578
1579 u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1580 u16 cap)
1581 {
1582 __le16 tmp;
1583
1584 *pos++ = WLAN_EID_HT_CAPABILITY;
1585 *pos++ = sizeof(struct ieee80211_ht_cap);
1586 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
1587
1588 /* capability flags */
1589 tmp = cpu_to_le16(cap);
1590 memcpy(pos, &tmp, sizeof(u16));
1591 pos += sizeof(u16);
1592
1593 /* AMPDU parameters */
1594 *pos++ = ht_cap->ampdu_factor |
1595 (ht_cap->ampdu_density <<
1596 IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
1597
1598 /* MCS set */
1599 memcpy(pos, &ht_cap->mcs, sizeof(ht_cap->mcs));
1600 pos += sizeof(ht_cap->mcs);
1601
1602 /* extended capabilities */
1603 pos += sizeof(__le16);
1604
1605 /* BF capabilities */
1606 pos += sizeof(__le32);
1607
1608 /* antenna selection */
1609 pos += sizeof(u8);
1610
1611 return pos;
1612 }
1613
1614 u8 *ieee80211_ie_build_ht_info(u8 *pos,
1615 struct ieee80211_sta_ht_cap *ht_cap,
1616 struct ieee80211_channel *channel,
1617 enum nl80211_channel_type channel_type)
1618 {
1619 struct ieee80211_ht_info *ht_info;
1620 /* Build HT Information */
1621 *pos++ = WLAN_EID_HT_INFORMATION;
1622 *pos++ = sizeof(struct ieee80211_ht_info);
1623 ht_info = (struct ieee80211_ht_info *)pos;
1624 ht_info->control_chan =
1625 ieee80211_frequency_to_channel(channel->center_freq);
1626 switch (channel_type) {
1627 case NL80211_CHAN_HT40MINUS:
1628 ht_info->ht_param = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1629 break;
1630 case NL80211_CHAN_HT40PLUS:
1631 ht_info->ht_param = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
1632 break;
1633 case NL80211_CHAN_HT20:
1634 default:
1635 ht_info->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
1636 break;
1637 }
1638 if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40)
1639 ht_info->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
1640
1641 /*
1642 * Note: According to 802.11n-2009 9.13.3.1, HT Protection field and
1643 * RIFS Mode are reserved in IBSS mode, therefore keep them at 0
1644 */
1645 ht_info->operation_mode = 0x0000;
1646 ht_info->stbc_param = 0x0000;
1647
1648 /* It seems that Basic MCS set and Supported MCS set
1649 are identical for the first 10 bytes */
1650 memset(&ht_info->basic_set, 0, 16);
1651 memcpy(&ht_info->basic_set, &ht_cap->mcs, 10);
1652
1653 return pos + sizeof(struct ieee80211_ht_info);
1654 }
1655
1656 enum nl80211_channel_type
1657 ieee80211_ht_info_to_channel_type(struct ieee80211_ht_info *ht_info)
1658 {
1659 enum nl80211_channel_type channel_type;
1660
1661 if (!ht_info)
1662 return NL80211_CHAN_NO_HT;
1663
1664 switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
1665 case IEEE80211_HT_PARAM_CHA_SEC_NONE:
1666 channel_type = NL80211_CHAN_HT20;
1667 break;
1668 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1669 channel_type = NL80211_CHAN_HT40PLUS;
1670 break;
1671 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1672 channel_type = NL80211_CHAN_HT40MINUS;
1673 break;
1674 default:
1675 channel_type = NL80211_CHAN_NO_HT;
1676 }
1677
1678 return channel_type;
1679 }
1680
1681 int ieee80211_add_srates_ie(struct ieee80211_vif *vif, struct sk_buff *skb)
1682 {
1683 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1684 struct ieee80211_local *local = sdata->local;
1685 struct ieee80211_supported_band *sband;
1686 int rate;
1687 u8 i, rates, *pos;
1688
1689 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1690 rates = sband->n_bitrates;
1691 if (rates > 8)
1692 rates = 8;
1693
1694 if (skb_tailroom(skb) < rates + 2)
1695 return -ENOMEM;
1696
1697 pos = skb_put(skb, rates + 2);
1698 *pos++ = WLAN_EID_SUPP_RATES;
1699 *pos++ = rates;
1700 for (i = 0; i < rates; i++) {
1701 rate = sband->bitrates[i].bitrate;
1702 *pos++ = (u8) (rate / 5);
1703 }
1704
1705 return 0;
1706 }
1707
1708 int ieee80211_add_ext_srates_ie(struct ieee80211_vif *vif, struct sk_buff *skb)
1709 {
1710 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1711 struct ieee80211_local *local = sdata->local;
1712 struct ieee80211_supported_band *sband;
1713 int rate;
1714 u8 i, exrates, *pos;
1715
1716 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1717 exrates = sband->n_bitrates;
1718 if (exrates > 8)
1719 exrates -= 8;
1720 else
1721 exrates = 0;
1722
1723 if (skb_tailroom(skb) < exrates + 2)
1724 return -ENOMEM;
1725
1726 if (exrates) {
1727 pos = skb_put(skb, exrates + 2);
1728 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1729 *pos++ = exrates;
1730 for (i = 8; i < sband->n_bitrates; i++) {
1731 rate = sband->bitrates[i].bitrate;
1732 *pos++ = (u8) (rate / 5);
1733 }
1734 }
1735 return 0;
1736 }
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