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