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mac80211: use AC constants
[deliverable/linux.git] / net / mac80211 / util.c
1 /*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 * utilities for mac80211
12 */
13
14 #include <net/mac80211.h>
15 #include <linux/netdevice.h>
16 #include <linux/export.h>
17 #include <linux/types.h>
18 #include <linux/slab.h>
19 #include <linux/skbuff.h>
20 #include <linux/etherdevice.h>
21 #include <linux/if_arp.h>
22 #include <linux/bitmap.h>
23 #include <linux/crc32.h>
24 #include <net/net_namespace.h>
25 #include <net/cfg80211.h>
26 #include <net/rtnetlink.h>
27
28 #include "ieee80211_i.h"
29 #include "driver-ops.h"
30 #include "rate.h"
31 #include "mesh.h"
32 #include "wme.h"
33 #include "led.h"
34 #include "wep.h"
35
36 /* privid for wiphys to determine whether they belong to us or not */
37 void *mac80211_wiphy_privid = &mac80211_wiphy_privid;
38
39 struct ieee80211_hw *wiphy_to_ieee80211_hw(struct wiphy *wiphy)
40 {
41 struct ieee80211_local *local;
42 BUG_ON(!wiphy);
43
44 local = wiphy_priv(wiphy);
45 return &local->hw;
46 }
47 EXPORT_SYMBOL(wiphy_to_ieee80211_hw);
48
49 u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
50 enum nl80211_iftype type)
51 {
52 __le16 fc = hdr->frame_control;
53
54 /* drop ACK/CTS frames and incorrect hdr len (ctrl) */
55 if (len < 16)
56 return NULL;
57
58 if (ieee80211_is_data(fc)) {
59 if (len < 24) /* drop incorrect hdr len (data) */
60 return NULL;
61
62 if (ieee80211_has_a4(fc))
63 return NULL;
64 if (ieee80211_has_tods(fc))
65 return hdr->addr1;
66 if (ieee80211_has_fromds(fc))
67 return hdr->addr2;
68
69 return hdr->addr3;
70 }
71
72 if (ieee80211_is_mgmt(fc)) {
73 if (len < 24) /* drop incorrect hdr len (mgmt) */
74 return NULL;
75 return hdr->addr3;
76 }
77
78 if (ieee80211_is_ctl(fc)) {
79 if(ieee80211_is_pspoll(fc))
80 return hdr->addr1;
81
82 if (ieee80211_is_back_req(fc)) {
83 switch (type) {
84 case NL80211_IFTYPE_STATION:
85 return hdr->addr2;
86 case NL80211_IFTYPE_AP:
87 case NL80211_IFTYPE_AP_VLAN:
88 return hdr->addr1;
89 default:
90 break; /* fall through to the return */
91 }
92 }
93 }
94
95 return NULL;
96 }
97
98 void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
99 {
100 struct sk_buff *skb;
101 struct ieee80211_hdr *hdr;
102
103 skb_queue_walk(&tx->skbs, skb) {
104 hdr = (struct ieee80211_hdr *) skb->data;
105 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
106 }
107 }
108
109 int ieee80211_frame_duration(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_stop_queues_by_reason(struct ieee80211_hw *hw,
408 enum queue_stop_reason reason)
409 {
410 struct ieee80211_local *local = hw_to_local(hw);
411 unsigned long flags;
412 int i;
413
414 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
415
416 for (i = 0; i < hw->queues; i++)
417 __ieee80211_stop_queue(hw, i, reason);
418
419 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
420 }
421
422 void ieee80211_stop_queues(struct ieee80211_hw *hw)
423 {
424 ieee80211_stop_queues_by_reason(hw,
425 IEEE80211_QUEUE_STOP_REASON_DRIVER);
426 }
427 EXPORT_SYMBOL(ieee80211_stop_queues);
428
429 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
430 {
431 struct ieee80211_local *local = hw_to_local(hw);
432 unsigned long flags;
433 int ret;
434
435 if (WARN_ON(queue >= hw->queues))
436 return true;
437
438 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
439 ret = !!local->queue_stop_reasons[queue];
440 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
441 return ret;
442 }
443 EXPORT_SYMBOL(ieee80211_queue_stopped);
444
445 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
446 enum queue_stop_reason reason)
447 {
448 struct ieee80211_local *local = hw_to_local(hw);
449 unsigned long flags;
450 int i;
451
452 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
453
454 for (i = 0; i < hw->queues; i++)
455 __ieee80211_wake_queue(hw, i, reason);
456
457 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
458 }
459
460 void ieee80211_wake_queues(struct ieee80211_hw *hw)
461 {
462 ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
463 }
464 EXPORT_SYMBOL(ieee80211_wake_queues);
465
466 void ieee80211_iterate_active_interfaces(
467 struct ieee80211_hw *hw,
468 void (*iterator)(void *data, u8 *mac,
469 struct ieee80211_vif *vif),
470 void *data)
471 {
472 struct ieee80211_local *local = hw_to_local(hw);
473 struct ieee80211_sub_if_data *sdata;
474
475 mutex_lock(&local->iflist_mtx);
476
477 list_for_each_entry(sdata, &local->interfaces, list) {
478 switch (sdata->vif.type) {
479 case NL80211_IFTYPE_MONITOR:
480 case NL80211_IFTYPE_AP_VLAN:
481 continue;
482 default:
483 break;
484 }
485 if (ieee80211_sdata_running(sdata))
486 iterator(data, sdata->vif.addr,
487 &sdata->vif);
488 }
489
490 mutex_unlock(&local->iflist_mtx);
491 }
492 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
493
494 void ieee80211_iterate_active_interfaces_atomic(
495 struct ieee80211_hw *hw,
496 void (*iterator)(void *data, u8 *mac,
497 struct ieee80211_vif *vif),
498 void *data)
499 {
500 struct ieee80211_local *local = hw_to_local(hw);
501 struct ieee80211_sub_if_data *sdata;
502
503 rcu_read_lock();
504
505 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
506 switch (sdata->vif.type) {
507 case NL80211_IFTYPE_MONITOR:
508 case NL80211_IFTYPE_AP_VLAN:
509 continue;
510 default:
511 break;
512 }
513 if (ieee80211_sdata_running(sdata))
514 iterator(data, sdata->vif.addr,
515 &sdata->vif);
516 }
517
518 rcu_read_unlock();
519 }
520 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
521
522 /*
523 * Nothing should have been stuffed into the workqueue during
524 * the suspend->resume cycle. If this WARN is seen then there
525 * is a bug with either the driver suspend or something in
526 * mac80211 stuffing into the workqueue which we haven't yet
527 * cleared during mac80211's suspend cycle.
528 */
529 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
530 {
531 if (WARN(local->suspended && !local->resuming,
532 "queueing ieee80211 work while going to suspend\n"))
533 return false;
534
535 return true;
536 }
537
538 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
539 {
540 struct ieee80211_local *local = hw_to_local(hw);
541
542 if (!ieee80211_can_queue_work(local))
543 return;
544
545 queue_work(local->workqueue, work);
546 }
547 EXPORT_SYMBOL(ieee80211_queue_work);
548
549 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
550 struct delayed_work *dwork,
551 unsigned long delay)
552 {
553 struct ieee80211_local *local = hw_to_local(hw);
554
555 if (!ieee80211_can_queue_work(local))
556 return;
557
558 queue_delayed_work(local->workqueue, dwork, delay);
559 }
560 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
561
562 u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
563 struct ieee802_11_elems *elems,
564 u64 filter, u32 crc)
565 {
566 size_t left = len;
567 u8 *pos = start;
568 bool calc_crc = filter != 0;
569 DECLARE_BITMAP(seen_elems, 256);
570
571 bitmap_zero(seen_elems, 256);
572 memset(elems, 0, sizeof(*elems));
573 elems->ie_start = start;
574 elems->total_len = len;
575
576 while (left >= 2) {
577 u8 id, elen;
578 bool elem_parse_failed;
579
580 id = *pos++;
581 elen = *pos++;
582 left -= 2;
583
584 if (elen > left) {
585 elems->parse_error = true;
586 break;
587 }
588
589 if (id != WLAN_EID_VENDOR_SPECIFIC &&
590 id != WLAN_EID_QUIET &&
591 test_bit(id, seen_elems)) {
592 elems->parse_error = true;
593 left -= elen;
594 pos += elen;
595 continue;
596 }
597
598 if (calc_crc && id < 64 && (filter & (1ULL << id)))
599 crc = crc32_be(crc, pos - 2, elen + 2);
600
601 elem_parse_failed = false;
602
603 switch (id) {
604 case WLAN_EID_SSID:
605 elems->ssid = pos;
606 elems->ssid_len = elen;
607 break;
608 case WLAN_EID_SUPP_RATES:
609 elems->supp_rates = pos;
610 elems->supp_rates_len = elen;
611 break;
612 case WLAN_EID_FH_PARAMS:
613 elems->fh_params = pos;
614 elems->fh_params_len = elen;
615 break;
616 case WLAN_EID_DS_PARAMS:
617 elems->ds_params = pos;
618 elems->ds_params_len = elen;
619 break;
620 case WLAN_EID_CF_PARAMS:
621 elems->cf_params = pos;
622 elems->cf_params_len = elen;
623 break;
624 case WLAN_EID_TIM:
625 if (elen >= sizeof(struct ieee80211_tim_ie)) {
626 elems->tim = (void *)pos;
627 elems->tim_len = elen;
628 } else
629 elem_parse_failed = true;
630 break;
631 case WLAN_EID_IBSS_PARAMS:
632 elems->ibss_params = pos;
633 elems->ibss_params_len = elen;
634 break;
635 case WLAN_EID_CHALLENGE:
636 elems->challenge = pos;
637 elems->challenge_len = elen;
638 break;
639 case WLAN_EID_VENDOR_SPECIFIC:
640 if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
641 pos[2] == 0xf2) {
642 /* Microsoft OUI (00:50:F2) */
643
644 if (calc_crc)
645 crc = crc32_be(crc, pos - 2, elen + 2);
646
647 if (pos[3] == 1) {
648 /* OUI Type 1 - WPA IE */
649 elems->wpa = pos;
650 elems->wpa_len = elen;
651 } else if (elen >= 5 && pos[3] == 2) {
652 /* OUI Type 2 - WMM IE */
653 if (pos[4] == 0) {
654 elems->wmm_info = pos;
655 elems->wmm_info_len = elen;
656 } else if (pos[4] == 1) {
657 elems->wmm_param = pos;
658 elems->wmm_param_len = elen;
659 }
660 }
661 }
662 break;
663 case WLAN_EID_RSN:
664 elems->rsn = pos;
665 elems->rsn_len = elen;
666 break;
667 case WLAN_EID_ERP_INFO:
668 elems->erp_info = pos;
669 elems->erp_info_len = elen;
670 break;
671 case WLAN_EID_EXT_SUPP_RATES:
672 elems->ext_supp_rates = pos;
673 elems->ext_supp_rates_len = elen;
674 break;
675 case WLAN_EID_HT_CAPABILITY:
676 if (elen >= sizeof(struct ieee80211_ht_cap))
677 elems->ht_cap_elem = (void *)pos;
678 else
679 elem_parse_failed = true;
680 break;
681 case WLAN_EID_HT_OPERATION:
682 if (elen >= sizeof(struct ieee80211_ht_operation))
683 elems->ht_operation = (void *)pos;
684 else
685 elem_parse_failed = true;
686 break;
687 case WLAN_EID_MESH_ID:
688 elems->mesh_id = pos;
689 elems->mesh_id_len = elen;
690 break;
691 case WLAN_EID_MESH_CONFIG:
692 if (elen >= sizeof(struct ieee80211_meshconf_ie))
693 elems->mesh_config = (void *)pos;
694 else
695 elem_parse_failed = true;
696 break;
697 case WLAN_EID_PEER_MGMT:
698 elems->peering = pos;
699 elems->peering_len = elen;
700 break;
701 case WLAN_EID_PREQ:
702 elems->preq = pos;
703 elems->preq_len = elen;
704 break;
705 case WLAN_EID_PREP:
706 elems->prep = pos;
707 elems->prep_len = elen;
708 break;
709 case WLAN_EID_PERR:
710 elems->perr = pos;
711 elems->perr_len = elen;
712 break;
713 case WLAN_EID_RANN:
714 if (elen >= sizeof(struct ieee80211_rann_ie))
715 elems->rann = (void *)pos;
716 else
717 elem_parse_failed = true;
718 break;
719 case WLAN_EID_CHANNEL_SWITCH:
720 elems->ch_switch_elem = pos;
721 elems->ch_switch_elem_len = elen;
722 break;
723 case WLAN_EID_QUIET:
724 if (!elems->quiet_elem) {
725 elems->quiet_elem = pos;
726 elems->quiet_elem_len = elen;
727 }
728 elems->num_of_quiet_elem++;
729 break;
730 case WLAN_EID_COUNTRY:
731 elems->country_elem = pos;
732 elems->country_elem_len = elen;
733 break;
734 case WLAN_EID_PWR_CONSTRAINT:
735 elems->pwr_constr_elem = pos;
736 elems->pwr_constr_elem_len = elen;
737 break;
738 case WLAN_EID_TIMEOUT_INTERVAL:
739 elems->timeout_int = pos;
740 elems->timeout_int_len = elen;
741 break;
742 default:
743 break;
744 }
745
746 if (elem_parse_failed)
747 elems->parse_error = true;
748 else
749 set_bit(id, seen_elems);
750
751 left -= elen;
752 pos += elen;
753 }
754
755 if (left != 0)
756 elems->parse_error = true;
757
758 return crc;
759 }
760
761 void ieee802_11_parse_elems(u8 *start, size_t len,
762 struct ieee802_11_elems *elems)
763 {
764 ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
765 }
766
767 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata,
768 bool bss_notify)
769 {
770 struct ieee80211_local *local = sdata->local;
771 struct ieee80211_tx_queue_params qparam;
772 int queue;
773 bool use_11b;
774 int aCWmin, aCWmax;
775
776 if (!local->ops->conf_tx)
777 return;
778
779 memset(&qparam, 0, sizeof(qparam));
780
781 use_11b = (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) &&
782 !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
783
784 for (queue = 0; queue < local->hw.queues; queue++) {
785 /* Set defaults according to 802.11-2007 Table 7-37 */
786 aCWmax = 1023;
787 if (use_11b)
788 aCWmin = 31;
789 else
790 aCWmin = 15;
791
792 switch (queue) {
793 case IEEE80211_AC_BK:
794 qparam.cw_max = aCWmax;
795 qparam.cw_min = aCWmin;
796 qparam.txop = 0;
797 qparam.aifs = 7;
798 break;
799 default: /* never happens but let's not leave undefined */
800 case IEEE80211_AC_BE:
801 qparam.cw_max = aCWmax;
802 qparam.cw_min = aCWmin;
803 qparam.txop = 0;
804 qparam.aifs = 3;
805 break;
806 case IEEE80211_AC_VI:
807 qparam.cw_max = aCWmin;
808 qparam.cw_min = (aCWmin + 1) / 2 - 1;
809 if (use_11b)
810 qparam.txop = 6016/32;
811 else
812 qparam.txop = 3008/32;
813 qparam.aifs = 2;
814 break;
815 case IEEE80211_AC_VO:
816 qparam.cw_max = (aCWmin + 1) / 2 - 1;
817 qparam.cw_min = (aCWmin + 1) / 4 - 1;
818 if (use_11b)
819 qparam.txop = 3264/32;
820 else
821 qparam.txop = 1504/32;
822 qparam.aifs = 2;
823 break;
824 }
825
826 qparam.uapsd = false;
827
828 sdata->tx_conf[queue] = qparam;
829 drv_conf_tx(local, sdata, queue, &qparam);
830 }
831
832 /* after reinitialize QoS TX queues setting to default,
833 * disable QoS at all */
834
835 if (sdata->vif.type != NL80211_IFTYPE_MONITOR) {
836 sdata->vif.bss_conf.qos =
837 sdata->vif.type != NL80211_IFTYPE_STATION;
838 if (bss_notify)
839 ieee80211_bss_info_change_notify(sdata,
840 BSS_CHANGED_QOS);
841 }
842 }
843
844 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
845 const size_t supp_rates_len,
846 const u8 *supp_rates)
847 {
848 struct ieee80211_local *local = sdata->local;
849 int i, have_higher_than_11mbit = 0;
850
851 /* cf. IEEE 802.11 9.2.12 */
852 for (i = 0; i < supp_rates_len; i++)
853 if ((supp_rates[i] & 0x7f) * 5 > 110)
854 have_higher_than_11mbit = 1;
855
856 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
857 have_higher_than_11mbit)
858 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
859 else
860 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
861
862 ieee80211_set_wmm_default(sdata, true);
863 }
864
865 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
866 enum ieee80211_band band)
867 {
868 struct ieee80211_supported_band *sband;
869 struct ieee80211_rate *bitrates;
870 u32 mandatory_rates;
871 enum ieee80211_rate_flags mandatory_flag;
872 int i;
873
874 sband = local->hw.wiphy->bands[band];
875 if (!sband) {
876 WARN_ON(1);
877 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
878 }
879
880 if (band == IEEE80211_BAND_2GHZ)
881 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
882 else
883 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
884
885 bitrates = sband->bitrates;
886 mandatory_rates = 0;
887 for (i = 0; i < sband->n_bitrates; i++)
888 if (bitrates[i].flags & mandatory_flag)
889 mandatory_rates |= BIT(i);
890 return mandatory_rates;
891 }
892
893 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
894 u16 transaction, u16 auth_alg,
895 u8 *extra, size_t extra_len, const u8 *da,
896 const u8 *bssid, const u8 *key, u8 key_len, u8 key_idx)
897 {
898 struct ieee80211_local *local = sdata->local;
899 struct sk_buff *skb;
900 struct ieee80211_mgmt *mgmt;
901 int err;
902
903 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
904 sizeof(*mgmt) + 6 + extra_len);
905 if (!skb)
906 return;
907
908 skb_reserve(skb, local->hw.extra_tx_headroom);
909
910 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
911 memset(mgmt, 0, 24 + 6);
912 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
913 IEEE80211_STYPE_AUTH);
914 memcpy(mgmt->da, da, ETH_ALEN);
915 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
916 memcpy(mgmt->bssid, bssid, ETH_ALEN);
917 mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
918 mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
919 mgmt->u.auth.status_code = cpu_to_le16(0);
920 if (extra)
921 memcpy(skb_put(skb, extra_len), extra, extra_len);
922
923 if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
924 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
925 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
926 WARN_ON(err);
927 }
928
929 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
930 ieee80211_tx_skb(sdata, skb);
931 }
932
933 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
934 const u8 *ie, size_t ie_len,
935 enum ieee80211_band band, u32 rate_mask,
936 u8 channel)
937 {
938 struct ieee80211_supported_band *sband;
939 u8 *pos;
940 size_t offset = 0, noffset;
941 int supp_rates_len, i;
942 u8 rates[32];
943 int num_rates;
944 int ext_rates_len;
945
946 sband = local->hw.wiphy->bands[band];
947
948 pos = buffer;
949
950 num_rates = 0;
951 for (i = 0; i < sband->n_bitrates; i++) {
952 if ((BIT(i) & rate_mask) == 0)
953 continue; /* skip rate */
954 rates[num_rates++] = (u8) (sband->bitrates[i].bitrate / 5);
955 }
956
957 supp_rates_len = min_t(int, num_rates, 8);
958
959 *pos++ = WLAN_EID_SUPP_RATES;
960 *pos++ = supp_rates_len;
961 memcpy(pos, rates, supp_rates_len);
962 pos += supp_rates_len;
963
964 /* insert "request information" if in custom IEs */
965 if (ie && ie_len) {
966 static const u8 before_extrates[] = {
967 WLAN_EID_SSID,
968 WLAN_EID_SUPP_RATES,
969 WLAN_EID_REQUEST,
970 };
971 noffset = ieee80211_ie_split(ie, ie_len,
972 before_extrates,
973 ARRAY_SIZE(before_extrates),
974 offset);
975 memcpy(pos, ie + offset, noffset - offset);
976 pos += noffset - offset;
977 offset = noffset;
978 }
979
980 ext_rates_len = num_rates - supp_rates_len;
981 if (ext_rates_len > 0) {
982 *pos++ = WLAN_EID_EXT_SUPP_RATES;
983 *pos++ = ext_rates_len;
984 memcpy(pos, rates + supp_rates_len, ext_rates_len);
985 pos += ext_rates_len;
986 }
987
988 if (channel && sband->band == IEEE80211_BAND_2GHZ) {
989 *pos++ = WLAN_EID_DS_PARAMS;
990 *pos++ = 1;
991 *pos++ = channel;
992 }
993
994 /* insert custom IEs that go before HT */
995 if (ie && ie_len) {
996 static const u8 before_ht[] = {
997 WLAN_EID_SSID,
998 WLAN_EID_SUPP_RATES,
999 WLAN_EID_REQUEST,
1000 WLAN_EID_EXT_SUPP_RATES,
1001 WLAN_EID_DS_PARAMS,
1002 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1003 };
1004 noffset = ieee80211_ie_split(ie, ie_len,
1005 before_ht, ARRAY_SIZE(before_ht),
1006 offset);
1007 memcpy(pos, ie + offset, noffset - offset);
1008 pos += noffset - offset;
1009 offset = noffset;
1010 }
1011
1012 if (sband->ht_cap.ht_supported)
1013 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
1014 sband->ht_cap.cap);
1015
1016 /*
1017 * If adding more here, adjust code in main.c
1018 * that calculates local->scan_ies_len.
1019 */
1020
1021 /* add any remaining custom IEs */
1022 if (ie && ie_len) {
1023 noffset = ie_len;
1024 memcpy(pos, ie + offset, noffset - offset);
1025 pos += noffset - offset;
1026 }
1027
1028 return pos - buffer;
1029 }
1030
1031 struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
1032 u8 *dst, u32 ratemask,
1033 const u8 *ssid, size_t ssid_len,
1034 const u8 *ie, size_t ie_len,
1035 bool directed)
1036 {
1037 struct ieee80211_local *local = sdata->local;
1038 struct sk_buff *skb;
1039 struct ieee80211_mgmt *mgmt;
1040 size_t buf_len;
1041 u8 *buf;
1042 u8 chan;
1043
1044 /* FIXME: come up with a proper value */
1045 buf = kmalloc(200 + ie_len, GFP_KERNEL);
1046 if (!buf)
1047 return NULL;
1048
1049 /*
1050 * Do not send DS Channel parameter for directed probe requests
1051 * in order to maximize the chance that we get a response. Some
1052 * badly-behaved APs don't respond when this parameter is included.
1053 */
1054 if (directed)
1055 chan = 0;
1056 else
1057 chan = ieee80211_frequency_to_channel(
1058 local->hw.conf.channel->center_freq);
1059
1060 buf_len = ieee80211_build_preq_ies(local, buf, ie, ie_len,
1061 local->hw.conf.channel->band,
1062 ratemask, chan);
1063
1064 skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
1065 ssid, ssid_len,
1066 buf, buf_len);
1067 if (!skb)
1068 goto out;
1069
1070 if (dst) {
1071 mgmt = (struct ieee80211_mgmt *) skb->data;
1072 memcpy(mgmt->da, dst, ETH_ALEN);
1073 memcpy(mgmt->bssid, dst, ETH_ALEN);
1074 }
1075
1076 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1077
1078 out:
1079 kfree(buf);
1080
1081 return skb;
1082 }
1083
1084 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1085 const u8 *ssid, size_t ssid_len,
1086 const u8 *ie, size_t ie_len,
1087 u32 ratemask, bool directed, bool no_cck)
1088 {
1089 struct sk_buff *skb;
1090
1091 skb = ieee80211_build_probe_req(sdata, dst, ratemask, ssid, ssid_len,
1092 ie, ie_len, directed);
1093 if (skb) {
1094 if (no_cck)
1095 IEEE80211_SKB_CB(skb)->flags |=
1096 IEEE80211_TX_CTL_NO_CCK_RATE;
1097 ieee80211_tx_skb(sdata, skb);
1098 }
1099 }
1100
1101 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
1102 struct ieee802_11_elems *elems,
1103 enum ieee80211_band band)
1104 {
1105 struct ieee80211_supported_band *sband;
1106 struct ieee80211_rate *bitrates;
1107 size_t num_rates;
1108 u32 supp_rates;
1109 int i, j;
1110 sband = local->hw.wiphy->bands[band];
1111
1112 if (!sband) {
1113 WARN_ON(1);
1114 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1115 }
1116
1117 bitrates = sband->bitrates;
1118 num_rates = sband->n_bitrates;
1119 supp_rates = 0;
1120 for (i = 0; i < elems->supp_rates_len +
1121 elems->ext_supp_rates_len; i++) {
1122 u8 rate = 0;
1123 int own_rate;
1124 if (i < elems->supp_rates_len)
1125 rate = elems->supp_rates[i];
1126 else if (elems->ext_supp_rates)
1127 rate = elems->ext_supp_rates
1128 [i - elems->supp_rates_len];
1129 own_rate = 5 * (rate & 0x7f);
1130 for (j = 0; j < num_rates; j++)
1131 if (bitrates[j].bitrate == own_rate)
1132 supp_rates |= BIT(j);
1133 }
1134 return supp_rates;
1135 }
1136
1137 void ieee80211_stop_device(struct ieee80211_local *local)
1138 {
1139 ieee80211_led_radio(local, false);
1140 ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
1141
1142 cancel_work_sync(&local->reconfig_filter);
1143
1144 flush_workqueue(local->workqueue);
1145 drv_stop(local);
1146 }
1147
1148 int ieee80211_reconfig(struct ieee80211_local *local)
1149 {
1150 struct ieee80211_hw *hw = &local->hw;
1151 struct ieee80211_sub_if_data *sdata;
1152 struct sta_info *sta;
1153 int res, i;
1154
1155 #ifdef CONFIG_PM
1156 if (local->suspended)
1157 local->resuming = true;
1158
1159 if (local->wowlan) {
1160 local->wowlan = false;
1161 res = drv_resume(local);
1162 if (res < 0) {
1163 local->resuming = false;
1164 return res;
1165 }
1166 if (res == 0)
1167 goto wake_up;
1168 WARN_ON(res > 1);
1169 /*
1170 * res is 1, which means the driver requested
1171 * to go through a regular reset on wakeup.
1172 */
1173 }
1174 #endif
1175 /* everything else happens only if HW was up & running */
1176 if (!local->open_count)
1177 goto wake_up;
1178
1179 /*
1180 * Upon resume hardware can sometimes be goofy due to
1181 * various platform / driver / bus issues, so restarting
1182 * the device may at times not work immediately. Propagate
1183 * the error.
1184 */
1185 res = drv_start(local);
1186 if (res) {
1187 WARN(local->suspended, "Hardware became unavailable "
1188 "upon resume. This could be a software issue "
1189 "prior to suspend or a hardware issue.\n");
1190 return res;
1191 }
1192
1193 /* setup fragmentation threshold */
1194 drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
1195
1196 /* setup RTS threshold */
1197 drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1198
1199 /* reset coverage class */
1200 drv_set_coverage_class(local, hw->wiphy->coverage_class);
1201
1202 ieee80211_led_radio(local, true);
1203 ieee80211_mod_tpt_led_trig(local,
1204 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1205
1206 /* add interfaces */
1207 list_for_each_entry(sdata, &local->interfaces, list) {
1208 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1209 sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1210 ieee80211_sdata_running(sdata))
1211 res = drv_add_interface(local, sdata);
1212 }
1213
1214 /* add STAs back */
1215 mutex_lock(&local->sta_mtx);
1216 list_for_each_entry(sta, &local->sta_list, list) {
1217 if (sta->uploaded) {
1218 enum ieee80211_sta_state state;
1219
1220 for (state = IEEE80211_STA_NOTEXIST;
1221 state < sta->sta_state - 1; state++)
1222 WARN_ON(drv_sta_state(local, sta->sdata, sta,
1223 state, state + 1));
1224 }
1225 }
1226 mutex_unlock(&local->sta_mtx);
1227
1228 /* reconfigure tx conf */
1229 list_for_each_entry(sdata, &local->interfaces, list) {
1230 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1231 sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1232 !ieee80211_sdata_running(sdata))
1233 continue;
1234
1235 for (i = 0; i < hw->queues; i++)
1236 drv_conf_tx(local, sdata, i, &sdata->tx_conf[i]);
1237 }
1238
1239 /* reconfigure hardware */
1240 ieee80211_hw_config(local, ~0);
1241
1242 ieee80211_configure_filter(local);
1243
1244 /* Finally also reconfigure all the BSS information */
1245 list_for_each_entry(sdata, &local->interfaces, list) {
1246 u32 changed;
1247
1248 if (!ieee80211_sdata_running(sdata))
1249 continue;
1250
1251 /* common change flags for all interface types */
1252 changed = BSS_CHANGED_ERP_CTS_PROT |
1253 BSS_CHANGED_ERP_PREAMBLE |
1254 BSS_CHANGED_ERP_SLOT |
1255 BSS_CHANGED_HT |
1256 BSS_CHANGED_BASIC_RATES |
1257 BSS_CHANGED_BEACON_INT |
1258 BSS_CHANGED_BSSID |
1259 BSS_CHANGED_CQM |
1260 BSS_CHANGED_QOS |
1261 BSS_CHANGED_IDLE;
1262
1263 switch (sdata->vif.type) {
1264 case NL80211_IFTYPE_STATION:
1265 changed |= BSS_CHANGED_ASSOC |
1266 BSS_CHANGED_ARP_FILTER;
1267 mutex_lock(&sdata->u.mgd.mtx);
1268 ieee80211_bss_info_change_notify(sdata, changed);
1269 mutex_unlock(&sdata->u.mgd.mtx);
1270 break;
1271 case NL80211_IFTYPE_ADHOC:
1272 changed |= BSS_CHANGED_IBSS;
1273 /* fall through */
1274 case NL80211_IFTYPE_AP:
1275 changed |= BSS_CHANGED_SSID;
1276
1277 if (sdata->vif.type == NL80211_IFTYPE_AP)
1278 changed |= BSS_CHANGED_AP_PROBE_RESP;
1279
1280 /* fall through */
1281 case NL80211_IFTYPE_MESH_POINT:
1282 changed |= BSS_CHANGED_BEACON |
1283 BSS_CHANGED_BEACON_ENABLED;
1284 ieee80211_bss_info_change_notify(sdata, changed);
1285 break;
1286 case NL80211_IFTYPE_WDS:
1287 break;
1288 case NL80211_IFTYPE_AP_VLAN:
1289 case NL80211_IFTYPE_MONITOR:
1290 /* ignore virtual */
1291 break;
1292 case NL80211_IFTYPE_UNSPECIFIED:
1293 case NUM_NL80211_IFTYPES:
1294 case NL80211_IFTYPE_P2P_CLIENT:
1295 case NL80211_IFTYPE_P2P_GO:
1296 WARN_ON(1);
1297 break;
1298 }
1299 }
1300
1301 ieee80211_recalc_ps(local, -1);
1302
1303 /*
1304 * The sta might be in psm against the ap (e.g. because
1305 * this was the state before a hw restart), so we
1306 * explicitly send a null packet in order to make sure
1307 * it'll sync against the ap (and get out of psm).
1308 */
1309 if (!(local->hw.conf.flags & IEEE80211_CONF_PS)) {
1310 list_for_each_entry(sdata, &local->interfaces, list) {
1311 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1312 continue;
1313
1314 ieee80211_send_nullfunc(local, sdata, 0);
1315 }
1316 }
1317
1318 /*
1319 * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
1320 * sessions can be established after a resume.
1321 *
1322 * Also tear down aggregation sessions since reconfiguring
1323 * them in a hardware restart scenario is not easily done
1324 * right now, and the hardware will have lost information
1325 * about the sessions, but we and the AP still think they
1326 * are active. This is really a workaround though.
1327 */
1328 if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1329 mutex_lock(&local->sta_mtx);
1330
1331 list_for_each_entry(sta, &local->sta_list, list) {
1332 ieee80211_sta_tear_down_BA_sessions(sta, true);
1333 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
1334 }
1335
1336 mutex_unlock(&local->sta_mtx);
1337 }
1338
1339 /* add back keys */
1340 list_for_each_entry(sdata, &local->interfaces, list)
1341 if (ieee80211_sdata_running(sdata))
1342 ieee80211_enable_keys(sdata);
1343
1344 wake_up:
1345 ieee80211_wake_queues_by_reason(hw,
1346 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1347
1348 /*
1349 * If this is for hw restart things are still running.
1350 * We may want to change that later, however.
1351 */
1352 if (!local->suspended)
1353 return 0;
1354
1355 #ifdef CONFIG_PM
1356 /* first set suspended false, then resuming */
1357 local->suspended = false;
1358 mb();
1359 local->resuming = false;
1360
1361 list_for_each_entry(sdata, &local->interfaces, list) {
1362 switch(sdata->vif.type) {
1363 case NL80211_IFTYPE_STATION:
1364 ieee80211_sta_restart(sdata);
1365 break;
1366 case NL80211_IFTYPE_ADHOC:
1367 ieee80211_ibss_restart(sdata);
1368 break;
1369 case NL80211_IFTYPE_MESH_POINT:
1370 ieee80211_mesh_restart(sdata);
1371 break;
1372 default:
1373 break;
1374 }
1375 }
1376
1377 mod_timer(&local->sta_cleanup, jiffies + 1);
1378
1379 mutex_lock(&local->sta_mtx);
1380 list_for_each_entry(sta, &local->sta_list, list)
1381 mesh_plink_restart(sta);
1382 mutex_unlock(&local->sta_mtx);
1383 #else
1384 WARN_ON(1);
1385 #endif
1386 return 0;
1387 }
1388
1389 void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
1390 {
1391 struct ieee80211_sub_if_data *sdata;
1392 struct ieee80211_local *local;
1393 struct ieee80211_key *key;
1394
1395 if (WARN_ON(!vif))
1396 return;
1397
1398 sdata = vif_to_sdata(vif);
1399 local = sdata->local;
1400
1401 if (WARN_ON(!local->resuming))
1402 return;
1403
1404 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1405 return;
1406
1407 sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;
1408
1409 mutex_lock(&local->key_mtx);
1410 list_for_each_entry(key, &sdata->key_list, list)
1411 key->flags |= KEY_FLAG_TAINTED;
1412 mutex_unlock(&local->key_mtx);
1413 }
1414 EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);
1415
1416 static int check_mgd_smps(struct ieee80211_if_managed *ifmgd,
1417 enum ieee80211_smps_mode *smps_mode)
1418 {
1419 if (ifmgd->associated) {
1420 *smps_mode = ifmgd->ap_smps;
1421
1422 if (*smps_mode == IEEE80211_SMPS_AUTOMATIC) {
1423 if (ifmgd->powersave)
1424 *smps_mode = IEEE80211_SMPS_DYNAMIC;
1425 else
1426 *smps_mode = IEEE80211_SMPS_OFF;
1427 }
1428
1429 return 1;
1430 }
1431
1432 return 0;
1433 }
1434
1435 /* must hold iflist_mtx */
1436 void ieee80211_recalc_smps(struct ieee80211_local *local)
1437 {
1438 struct ieee80211_sub_if_data *sdata;
1439 enum ieee80211_smps_mode smps_mode = IEEE80211_SMPS_OFF;
1440 int count = 0;
1441
1442 lockdep_assert_held(&local->iflist_mtx);
1443
1444 /*
1445 * This function could be improved to handle multiple
1446 * interfaces better, but right now it makes any
1447 * non-station interfaces force SM PS to be turned
1448 * off. If there are multiple station interfaces it
1449 * could also use the best possible mode, e.g. if
1450 * one is in static and the other in dynamic then
1451 * dynamic is ok.
1452 */
1453
1454 list_for_each_entry(sdata, &local->interfaces, list) {
1455 if (!ieee80211_sdata_running(sdata))
1456 continue;
1457 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1458 goto set;
1459
1460 count += check_mgd_smps(&sdata->u.mgd, &smps_mode);
1461
1462 if (count > 1) {
1463 smps_mode = IEEE80211_SMPS_OFF;
1464 break;
1465 }
1466 }
1467
1468 if (smps_mode == local->smps_mode)
1469 return;
1470
1471 set:
1472 local->smps_mode = smps_mode;
1473 /* changed flag is auto-detected for this */
1474 ieee80211_hw_config(local, 0);
1475 }
1476
1477 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1478 {
1479 int i;
1480
1481 for (i = 0; i < n_ids; i++)
1482 if (ids[i] == id)
1483 return true;
1484 return false;
1485 }
1486
1487 /**
1488 * ieee80211_ie_split - split an IE buffer according to ordering
1489 *
1490 * @ies: the IE buffer
1491 * @ielen: the length of the IE buffer
1492 * @ids: an array with element IDs that are allowed before
1493 * the split
1494 * @n_ids: the size of the element ID array
1495 * @offset: offset where to start splitting in the buffer
1496 *
1497 * This function splits an IE buffer by updating the @offset
1498 * variable to point to the location where the buffer should be
1499 * split.
1500 *
1501 * It assumes that the given IE buffer is well-formed, this
1502 * has to be guaranteed by the caller!
1503 *
1504 * It also assumes that the IEs in the buffer are ordered
1505 * correctly, if not the result of using this function will not
1506 * be ordered correctly either, i.e. it does no reordering.
1507 *
1508 * The function returns the offset where the next part of the
1509 * buffer starts, which may be @ielen if the entire (remainder)
1510 * of the buffer should be used.
1511 */
1512 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1513 const u8 *ids, int n_ids, size_t offset)
1514 {
1515 size_t pos = offset;
1516
1517 while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1518 pos += 2 + ies[pos + 1];
1519
1520 return pos;
1521 }
1522
1523 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1524 {
1525 size_t pos = offset;
1526
1527 while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1528 pos += 2 + ies[pos + 1];
1529
1530 return pos;
1531 }
1532
1533 static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
1534 int rssi_min_thold,
1535 int rssi_max_thold)
1536 {
1537 trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);
1538
1539 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1540 return;
1541
1542 /*
1543 * Scale up threshold values before storing it, as the RSSI averaging
1544 * algorithm uses a scaled up value as well. Change this scaling
1545 * factor if the RSSI averaging algorithm changes.
1546 */
1547 sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
1548 sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
1549 }
1550
1551 void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
1552 int rssi_min_thold,
1553 int rssi_max_thold)
1554 {
1555 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1556
1557 WARN_ON(rssi_min_thold == rssi_max_thold ||
1558 rssi_min_thold > rssi_max_thold);
1559
1560 _ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
1561 rssi_max_thold);
1562 }
1563 EXPORT_SYMBOL(ieee80211_enable_rssi_reports);
1564
1565 void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
1566 {
1567 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1568
1569 _ieee80211_enable_rssi_reports(sdata, 0, 0);
1570 }
1571 EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
1572
1573 u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1574 u16 cap)
1575 {
1576 __le16 tmp;
1577
1578 *pos++ = WLAN_EID_HT_CAPABILITY;
1579 *pos++ = sizeof(struct ieee80211_ht_cap);
1580 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
1581
1582 /* capability flags */
1583 tmp = cpu_to_le16(cap);
1584 memcpy(pos, &tmp, sizeof(u16));
1585 pos += sizeof(u16);
1586
1587 /* AMPDU parameters */
1588 *pos++ = ht_cap->ampdu_factor |
1589 (ht_cap->ampdu_density <<
1590 IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
1591
1592 /* MCS set */
1593 memcpy(pos, &ht_cap->mcs, sizeof(ht_cap->mcs));
1594 pos += sizeof(ht_cap->mcs);
1595
1596 /* extended capabilities */
1597 pos += sizeof(__le16);
1598
1599 /* BF capabilities */
1600 pos += sizeof(__le32);
1601
1602 /* antenna selection */
1603 pos += sizeof(u8);
1604
1605 return pos;
1606 }
1607
1608 u8 *ieee80211_ie_build_ht_oper(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1609 struct ieee80211_channel *channel,
1610 enum nl80211_channel_type channel_type)
1611 {
1612 struct ieee80211_ht_operation *ht_oper;
1613 /* Build HT Information */
1614 *pos++ = WLAN_EID_HT_OPERATION;
1615 *pos++ = sizeof(struct ieee80211_ht_operation);
1616 ht_oper = (struct ieee80211_ht_operation *)pos;
1617 ht_oper->primary_chan =
1618 ieee80211_frequency_to_channel(channel->center_freq);
1619 switch (channel_type) {
1620 case NL80211_CHAN_HT40MINUS:
1621 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1622 break;
1623 case NL80211_CHAN_HT40PLUS:
1624 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
1625 break;
1626 case NL80211_CHAN_HT20:
1627 default:
1628 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
1629 break;
1630 }
1631 if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40)
1632 ht_oper->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
1633
1634 /*
1635 * Note: According to 802.11n-2009 9.13.3.1, HT Protection field and
1636 * RIFS Mode are reserved in IBSS mode, therefore keep them at 0
1637 */
1638 ht_oper->operation_mode = 0x0000;
1639 ht_oper->stbc_param = 0x0000;
1640
1641 /* It seems that Basic MCS set and Supported MCS set
1642 are identical for the first 10 bytes */
1643 memset(&ht_oper->basic_set, 0, 16);
1644 memcpy(&ht_oper->basic_set, &ht_cap->mcs, 10);
1645
1646 return pos + sizeof(struct ieee80211_ht_operation);
1647 }
1648
1649 enum nl80211_channel_type
1650 ieee80211_ht_oper_to_channel_type(struct ieee80211_ht_operation *ht_oper)
1651 {
1652 enum nl80211_channel_type channel_type;
1653
1654 if (!ht_oper)
1655 return NL80211_CHAN_NO_HT;
1656
1657 switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
1658 case IEEE80211_HT_PARAM_CHA_SEC_NONE:
1659 channel_type = NL80211_CHAN_HT20;
1660 break;
1661 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1662 channel_type = NL80211_CHAN_HT40PLUS;
1663 break;
1664 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1665 channel_type = NL80211_CHAN_HT40MINUS;
1666 break;
1667 default:
1668 channel_type = NL80211_CHAN_NO_HT;
1669 }
1670
1671 return channel_type;
1672 }
1673
1674 int ieee80211_add_srates_ie(struct ieee80211_vif *vif, struct sk_buff *skb)
1675 {
1676 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1677 struct ieee80211_local *local = sdata->local;
1678 struct ieee80211_supported_band *sband;
1679 int rate;
1680 u8 i, rates, *pos;
1681
1682 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1683 rates = sband->n_bitrates;
1684 if (rates > 8)
1685 rates = 8;
1686
1687 if (skb_tailroom(skb) < rates + 2)
1688 return -ENOMEM;
1689
1690 pos = skb_put(skb, rates + 2);
1691 *pos++ = WLAN_EID_SUPP_RATES;
1692 *pos++ = rates;
1693 for (i = 0; i < rates; i++) {
1694 rate = sband->bitrates[i].bitrate;
1695 *pos++ = (u8) (rate / 5);
1696 }
1697
1698 return 0;
1699 }
1700
1701 int ieee80211_add_ext_srates_ie(struct ieee80211_vif *vif, struct sk_buff *skb)
1702 {
1703 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1704 struct ieee80211_local *local = sdata->local;
1705 struct ieee80211_supported_band *sband;
1706 int rate;
1707 u8 i, exrates, *pos;
1708
1709 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1710 exrates = sband->n_bitrates;
1711 if (exrates > 8)
1712 exrates -= 8;
1713 else
1714 exrates = 0;
1715
1716 if (skb_tailroom(skb) < exrates + 2)
1717 return -ENOMEM;
1718
1719 if (exrates) {
1720 pos = skb_put(skb, exrates + 2);
1721 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1722 *pos++ = exrates;
1723 for (i = 8; i < sband->n_bitrates; i++) {
1724 rate = sband->bitrates[i].bitrate;
1725 *pos++ = (u8) (rate / 5);
1726 }
1727 }
1728 return 0;
1729 }
Linux kernel - Deliverables
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