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batman-adv: prepare lq_update_lock to be shared among different protocols
[deliverable/linux.git] / net / mac80211 / util.c
1 /*
2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
5 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 * utilities for mac80211
12 */
13
14 #include <net/mac80211.h>
15 #include <linux/netdevice.h>
16 #include <linux/export.h>
17 #include <linux/types.h>
18 #include <linux/slab.h>
19 #include <linux/skbuff.h>
20 #include <linux/etherdevice.h>
21 #include <linux/if_arp.h>
22 #include <linux/bitmap.h>
23 #include <linux/crc32.h>
24 #include <net/net_namespace.h>
25 #include <net/cfg80211.h>
26 #include <net/rtnetlink.h>
27
28 #include "ieee80211_i.h"
29 #include "driver-ops.h"
30 #include "rate.h"
31 #include "mesh.h"
32 #include "wme.h"
33 #include "led.h"
34 #include "wep.h"
35
36 /* privid for wiphys to determine whether they belong to us or not */
37 void *mac80211_wiphy_privid = &mac80211_wiphy_privid;
38
39 struct ieee80211_hw *wiphy_to_ieee80211_hw(struct wiphy *wiphy)
40 {
41 struct ieee80211_local *local;
42 BUG_ON(!wiphy);
43
44 local = wiphy_priv(wiphy);
45 return &local->hw;
46 }
47 EXPORT_SYMBOL(wiphy_to_ieee80211_hw);
48
49 u8 *ieee80211_get_bssid(struct ieee80211_hdr *hdr, size_t len,
50 enum nl80211_iftype type)
51 {
52 __le16 fc = hdr->frame_control;
53
54 /* drop ACK/CTS frames and incorrect hdr len (ctrl) */
55 if (len < 16)
56 return NULL;
57
58 if (ieee80211_is_data(fc)) {
59 if (len < 24) /* drop incorrect hdr len (data) */
60 return NULL;
61
62 if (ieee80211_has_a4(fc))
63 return NULL;
64 if (ieee80211_has_tods(fc))
65 return hdr->addr1;
66 if (ieee80211_has_fromds(fc))
67 return hdr->addr2;
68
69 return hdr->addr3;
70 }
71
72 if (ieee80211_is_mgmt(fc)) {
73 if (len < 24) /* drop incorrect hdr len (mgmt) */
74 return NULL;
75 return hdr->addr3;
76 }
77
78 if (ieee80211_is_ctl(fc)) {
79 if(ieee80211_is_pspoll(fc))
80 return hdr->addr1;
81
82 if (ieee80211_is_back_req(fc)) {
83 switch (type) {
84 case NL80211_IFTYPE_STATION:
85 return hdr->addr2;
86 case NL80211_IFTYPE_AP:
87 case NL80211_IFTYPE_AP_VLAN:
88 return hdr->addr1;
89 default:
90 break; /* fall through to the return */
91 }
92 }
93 }
94
95 return NULL;
96 }
97
98 void ieee80211_tx_set_protected(struct ieee80211_tx_data *tx)
99 {
100 struct sk_buff *skb;
101 struct ieee80211_hdr *hdr;
102
103 skb_queue_walk(&tx->skbs, skb) {
104 hdr = (struct ieee80211_hdr *) skb->data;
105 hdr->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
106 }
107 }
108
109 int ieee80211_frame_duration(enum ieee80211_band band, size_t len,
110 int rate, int erp, int short_preamble)
111 {
112 int dur;
113
114 /* calculate duration (in microseconds, rounded up to next higher
115 * integer if it includes a fractional microsecond) to send frame of
116 * len bytes (does not include FCS) at the given rate. Duration will
117 * also include SIFS.
118 *
119 * rate is in 100 kbps, so divident is multiplied by 10 in the
120 * DIV_ROUND_UP() operations.
121 */
122
123 if (band == IEEE80211_BAND_5GHZ || erp) {
124 /*
125 * OFDM:
126 *
127 * N_DBPS = DATARATE x 4
128 * N_SYM = Ceiling((16+8xLENGTH+6) / N_DBPS)
129 * (16 = SIGNAL time, 6 = tail bits)
130 * TXTIME = T_PREAMBLE + T_SIGNAL + T_SYM x N_SYM + Signal Ext
131 *
132 * T_SYM = 4 usec
133 * 802.11a - 17.5.2: aSIFSTime = 16 usec
134 * 802.11g - 19.8.4: aSIFSTime = 10 usec +
135 * signal ext = 6 usec
136 */
137 dur = 16; /* SIFS + signal ext */
138 dur += 16; /* 17.3.2.3: T_PREAMBLE = 16 usec */
139 dur += 4; /* 17.3.2.3: T_SIGNAL = 4 usec */
140 dur += 4 * DIV_ROUND_UP((16 + 8 * (len + 4) + 6) * 10,
141 4 * rate); /* T_SYM x N_SYM */
142 } else {
143 /*
144 * 802.11b or 802.11g with 802.11b compatibility:
145 * 18.3.4: TXTIME = PreambleLength + PLCPHeaderTime +
146 * Ceiling(((LENGTH+PBCC)x8)/DATARATE). PBCC=0.
147 *
148 * 802.11 (DS): 15.3.3, 802.11b: 18.3.4
149 * aSIFSTime = 10 usec
150 * aPreambleLength = 144 usec or 72 usec with short preamble
151 * aPLCPHeaderLength = 48 usec or 24 usec with short preamble
152 */
153 dur = 10; /* aSIFSTime = 10 usec */
154 dur += short_preamble ? (72 + 24) : (144 + 48);
155
156 dur += DIV_ROUND_UP(8 * (len + 4) * 10, rate);
157 }
158
159 return dur;
160 }
161
162 /* Exported duration function for driver use */
163 __le16 ieee80211_generic_frame_duration(struct ieee80211_hw *hw,
164 struct ieee80211_vif *vif,
165 enum ieee80211_band band,
166 size_t frame_len,
167 struct ieee80211_rate *rate)
168 {
169 struct ieee80211_sub_if_data *sdata;
170 u16 dur;
171 int erp;
172 bool short_preamble = false;
173
174 erp = 0;
175 if (vif) {
176 sdata = vif_to_sdata(vif);
177 short_preamble = sdata->vif.bss_conf.use_short_preamble;
178 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
179 erp = rate->flags & IEEE80211_RATE_ERP_G;
180 }
181
182 dur = ieee80211_frame_duration(band, frame_len, rate->bitrate, erp,
183 short_preamble);
184
185 return cpu_to_le16(dur);
186 }
187 EXPORT_SYMBOL(ieee80211_generic_frame_duration);
188
189 __le16 ieee80211_rts_duration(struct ieee80211_hw *hw,
190 struct ieee80211_vif *vif, size_t frame_len,
191 const struct ieee80211_tx_info *frame_txctl)
192 {
193 struct ieee80211_local *local = hw_to_local(hw);
194 struct ieee80211_rate *rate;
195 struct ieee80211_sub_if_data *sdata;
196 bool short_preamble;
197 int erp;
198 u16 dur;
199 struct ieee80211_supported_band *sband;
200
201 sband = local->hw.wiphy->bands[frame_txctl->band];
202
203 short_preamble = false;
204
205 rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
206
207 erp = 0;
208 if (vif) {
209 sdata = vif_to_sdata(vif);
210 short_preamble = sdata->vif.bss_conf.use_short_preamble;
211 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
212 erp = rate->flags & IEEE80211_RATE_ERP_G;
213 }
214
215 /* CTS duration */
216 dur = ieee80211_frame_duration(sband->band, 10, rate->bitrate,
217 erp, short_preamble);
218 /* Data frame duration */
219 dur += ieee80211_frame_duration(sband->band, frame_len, rate->bitrate,
220 erp, short_preamble);
221 /* ACK duration */
222 dur += ieee80211_frame_duration(sband->band, 10, rate->bitrate,
223 erp, short_preamble);
224
225 return cpu_to_le16(dur);
226 }
227 EXPORT_SYMBOL(ieee80211_rts_duration);
228
229 __le16 ieee80211_ctstoself_duration(struct ieee80211_hw *hw,
230 struct ieee80211_vif *vif,
231 size_t frame_len,
232 const struct ieee80211_tx_info *frame_txctl)
233 {
234 struct ieee80211_local *local = hw_to_local(hw);
235 struct ieee80211_rate *rate;
236 struct ieee80211_sub_if_data *sdata;
237 bool short_preamble;
238 int erp;
239 u16 dur;
240 struct ieee80211_supported_band *sband;
241
242 sband = local->hw.wiphy->bands[frame_txctl->band];
243
244 short_preamble = false;
245
246 rate = &sband->bitrates[frame_txctl->control.rts_cts_rate_idx];
247 erp = 0;
248 if (vif) {
249 sdata = vif_to_sdata(vif);
250 short_preamble = sdata->vif.bss_conf.use_short_preamble;
251 if (sdata->flags & IEEE80211_SDATA_OPERATING_GMODE)
252 erp = rate->flags & IEEE80211_RATE_ERP_G;
253 }
254
255 /* Data frame duration */
256 dur = ieee80211_frame_duration(sband->band, frame_len, rate->bitrate,
257 erp, short_preamble);
258 if (!(frame_txctl->flags & IEEE80211_TX_CTL_NO_ACK)) {
259 /* ACK duration */
260 dur += ieee80211_frame_duration(sband->band, 10, rate->bitrate,
261 erp, short_preamble);
262 }
263
264 return cpu_to_le16(dur);
265 }
266 EXPORT_SYMBOL(ieee80211_ctstoself_duration);
267
268 void ieee80211_propagate_queue_wake(struct ieee80211_local *local, int queue)
269 {
270 struct ieee80211_sub_if_data *sdata;
271
272 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
273 int ac;
274
275 if (test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))
276 continue;
277
278 if (sdata->vif.cab_queue != IEEE80211_INVAL_HW_QUEUE &&
279 local->queue_stop_reasons[sdata->vif.cab_queue] != 0)
280 continue;
281
282 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
283 int ac_queue = sdata->vif.hw_queue[ac];
284
285 if (ac_queue == queue ||
286 (sdata->vif.cab_queue == queue &&
287 local->queue_stop_reasons[ac_queue] == 0 &&
288 skb_queue_empty(&local->pending[ac_queue])))
289 netif_wake_subqueue(sdata->dev, ac);
290 }
291 }
292 }
293
294 static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
295 enum queue_stop_reason reason)
296 {
297 struct ieee80211_local *local = hw_to_local(hw);
298
299 trace_wake_queue(local, queue, reason);
300
301 if (WARN_ON(queue >= hw->queues))
302 return;
303
304 if (!test_bit(reason, &local->queue_stop_reasons[queue]))
305 return;
306
307 __clear_bit(reason, &local->queue_stop_reasons[queue]);
308
309 if (local->queue_stop_reasons[queue] != 0)
310 /* someone still has this queue stopped */
311 return;
312
313 if (skb_queue_empty(&local->pending[queue])) {
314 rcu_read_lock();
315 ieee80211_propagate_queue_wake(local, queue);
316 rcu_read_unlock();
317 } else
318 tasklet_schedule(&local->tx_pending_tasklet);
319 }
320
321 void ieee80211_wake_queue_by_reason(struct ieee80211_hw *hw, int queue,
322 enum queue_stop_reason reason)
323 {
324 struct ieee80211_local *local = hw_to_local(hw);
325 unsigned long flags;
326
327 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
328 __ieee80211_wake_queue(hw, queue, reason);
329 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
330 }
331
332 void ieee80211_wake_queue(struct ieee80211_hw *hw, int queue)
333 {
334 ieee80211_wake_queue_by_reason(hw, queue,
335 IEEE80211_QUEUE_STOP_REASON_DRIVER);
336 }
337 EXPORT_SYMBOL(ieee80211_wake_queue);
338
339 static void __ieee80211_stop_queue(struct ieee80211_hw *hw, int queue,
340 enum queue_stop_reason reason)
341 {
342 struct ieee80211_local *local = hw_to_local(hw);
343 struct ieee80211_sub_if_data *sdata;
344
345 trace_stop_queue(local, queue, reason);
346
347 if (WARN_ON(queue >= hw->queues))
348 return;
349
350 if (test_bit(reason, &local->queue_stop_reasons[queue]))
351 return;
352
353 __set_bit(reason, &local->queue_stop_reasons[queue]);
354
355 rcu_read_lock();
356 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
357 int ac;
358
359 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
360 if (sdata->vif.hw_queue[ac] == queue ||
361 sdata->vif.cab_queue == queue)
362 netif_stop_subqueue(sdata->dev, ac);
363 }
364 }
365 rcu_read_unlock();
366 }
367
368 void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
369 enum queue_stop_reason reason)
370 {
371 struct ieee80211_local *local = hw_to_local(hw);
372 unsigned long flags;
373
374 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
375 __ieee80211_stop_queue(hw, queue, reason);
376 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
377 }
378
379 void ieee80211_stop_queue(struct ieee80211_hw *hw, int queue)
380 {
381 ieee80211_stop_queue_by_reason(hw, queue,
382 IEEE80211_QUEUE_STOP_REASON_DRIVER);
383 }
384 EXPORT_SYMBOL(ieee80211_stop_queue);
385
386 void ieee80211_add_pending_skb(struct ieee80211_local *local,
387 struct sk_buff *skb)
388 {
389 struct ieee80211_hw *hw = &local->hw;
390 unsigned long flags;
391 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
392 int queue = info->hw_queue;
393
394 if (WARN_ON(!info->control.vif)) {
395 kfree_skb(skb);
396 return;
397 }
398
399 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
400 __ieee80211_stop_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
401 __skb_queue_tail(&local->pending[queue], skb);
402 __ieee80211_wake_queue(hw, queue, IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
403 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
404 }
405
406 void ieee80211_add_pending_skbs_fn(struct ieee80211_local *local,
407 struct sk_buff_head *skbs,
408 void (*fn)(void *data), void *data)
409 {
410 struct ieee80211_hw *hw = &local->hw;
411 struct sk_buff *skb;
412 unsigned long flags;
413 int queue, i;
414
415 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
416 while ((skb = skb_dequeue(skbs))) {
417 struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
418
419 if (WARN_ON(!info->control.vif)) {
420 kfree_skb(skb);
421 continue;
422 }
423
424 queue = info->hw_queue;
425
426 __ieee80211_stop_queue(hw, queue,
427 IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
428
429 __skb_queue_tail(&local->pending[queue], skb);
430 }
431
432 if (fn)
433 fn(data);
434
435 for (i = 0; i < hw->queues; i++)
436 __ieee80211_wake_queue(hw, i,
437 IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
438 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
439 }
440
441 void ieee80211_stop_queues_by_reason(struct ieee80211_hw *hw,
442 enum queue_stop_reason reason)
443 {
444 struct ieee80211_local *local = hw_to_local(hw);
445 unsigned long flags;
446 int i;
447
448 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
449
450 for (i = 0; i < hw->queues; i++)
451 __ieee80211_stop_queue(hw, i, reason);
452
453 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
454 }
455
456 void ieee80211_stop_queues(struct ieee80211_hw *hw)
457 {
458 ieee80211_stop_queues_by_reason(hw,
459 IEEE80211_QUEUE_STOP_REASON_DRIVER);
460 }
461 EXPORT_SYMBOL(ieee80211_stop_queues);
462
463 int ieee80211_queue_stopped(struct ieee80211_hw *hw, int queue)
464 {
465 struct ieee80211_local *local = hw_to_local(hw);
466 unsigned long flags;
467 int ret;
468
469 if (WARN_ON(queue >= hw->queues))
470 return true;
471
472 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
473 ret = !!local->queue_stop_reasons[queue];
474 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
475 return ret;
476 }
477 EXPORT_SYMBOL(ieee80211_queue_stopped);
478
479 void ieee80211_wake_queues_by_reason(struct ieee80211_hw *hw,
480 enum queue_stop_reason reason)
481 {
482 struct ieee80211_local *local = hw_to_local(hw);
483 unsigned long flags;
484 int i;
485
486 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
487
488 for (i = 0; i < hw->queues; i++)
489 __ieee80211_wake_queue(hw, i, reason);
490
491 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
492 }
493
494 void ieee80211_wake_queues(struct ieee80211_hw *hw)
495 {
496 ieee80211_wake_queues_by_reason(hw, IEEE80211_QUEUE_STOP_REASON_DRIVER);
497 }
498 EXPORT_SYMBOL(ieee80211_wake_queues);
499
500 void ieee80211_iterate_active_interfaces(
501 struct ieee80211_hw *hw,
502 void (*iterator)(void *data, u8 *mac,
503 struct ieee80211_vif *vif),
504 void *data)
505 {
506 struct ieee80211_local *local = hw_to_local(hw);
507 struct ieee80211_sub_if_data *sdata;
508
509 mutex_lock(&local->iflist_mtx);
510
511 list_for_each_entry(sdata, &local->interfaces, list) {
512 switch (sdata->vif.type) {
513 case NL80211_IFTYPE_MONITOR:
514 case NL80211_IFTYPE_AP_VLAN:
515 continue;
516 default:
517 break;
518 }
519 if (ieee80211_sdata_running(sdata))
520 iterator(data, sdata->vif.addr,
521 &sdata->vif);
522 }
523
524 mutex_unlock(&local->iflist_mtx);
525 }
526 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);
527
528 void ieee80211_iterate_active_interfaces_atomic(
529 struct ieee80211_hw *hw,
530 void (*iterator)(void *data, u8 *mac,
531 struct ieee80211_vif *vif),
532 void *data)
533 {
534 struct ieee80211_local *local = hw_to_local(hw);
535 struct ieee80211_sub_if_data *sdata;
536
537 rcu_read_lock();
538
539 list_for_each_entry_rcu(sdata, &local->interfaces, list) {
540 switch (sdata->vif.type) {
541 case NL80211_IFTYPE_MONITOR:
542 case NL80211_IFTYPE_AP_VLAN:
543 continue;
544 default:
545 break;
546 }
547 if (ieee80211_sdata_running(sdata))
548 iterator(data, sdata->vif.addr,
549 &sdata->vif);
550 }
551
552 rcu_read_unlock();
553 }
554 EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces_atomic);
555
556 /*
557 * Nothing should have been stuffed into the workqueue during
558 * the suspend->resume cycle. If this WARN is seen then there
559 * is a bug with either the driver suspend or something in
560 * mac80211 stuffing into the workqueue which we haven't yet
561 * cleared during mac80211's suspend cycle.
562 */
563 static bool ieee80211_can_queue_work(struct ieee80211_local *local)
564 {
565 if (WARN(local->suspended && !local->resuming,
566 "queueing ieee80211 work while going to suspend\n"))
567 return false;
568
569 return true;
570 }
571
572 void ieee80211_queue_work(struct ieee80211_hw *hw, struct work_struct *work)
573 {
574 struct ieee80211_local *local = hw_to_local(hw);
575
576 if (!ieee80211_can_queue_work(local))
577 return;
578
579 queue_work(local->workqueue, work);
580 }
581 EXPORT_SYMBOL(ieee80211_queue_work);
582
583 void ieee80211_queue_delayed_work(struct ieee80211_hw *hw,
584 struct delayed_work *dwork,
585 unsigned long delay)
586 {
587 struct ieee80211_local *local = hw_to_local(hw);
588
589 if (!ieee80211_can_queue_work(local))
590 return;
591
592 queue_delayed_work(local->workqueue, dwork, delay);
593 }
594 EXPORT_SYMBOL(ieee80211_queue_delayed_work);
595
596 u32 ieee802_11_parse_elems_crc(u8 *start, size_t len,
597 struct ieee802_11_elems *elems,
598 u64 filter, u32 crc)
599 {
600 size_t left = len;
601 u8 *pos = start;
602 bool calc_crc = filter != 0;
603 DECLARE_BITMAP(seen_elems, 256);
604
605 bitmap_zero(seen_elems, 256);
606 memset(elems, 0, sizeof(*elems));
607 elems->ie_start = start;
608 elems->total_len = len;
609
610 while (left >= 2) {
611 u8 id, elen;
612 bool elem_parse_failed;
613
614 id = *pos++;
615 elen = *pos++;
616 left -= 2;
617
618 if (elen > left) {
619 elems->parse_error = true;
620 break;
621 }
622
623 if (id != WLAN_EID_VENDOR_SPECIFIC &&
624 id != WLAN_EID_QUIET &&
625 test_bit(id, seen_elems)) {
626 elems->parse_error = true;
627 left -= elen;
628 pos += elen;
629 continue;
630 }
631
632 if (calc_crc && id < 64 && (filter & (1ULL << id)))
633 crc = crc32_be(crc, pos - 2, elen + 2);
634
635 elem_parse_failed = false;
636
637 switch (id) {
638 case WLAN_EID_SSID:
639 elems->ssid = pos;
640 elems->ssid_len = elen;
641 break;
642 case WLAN_EID_SUPP_RATES:
643 elems->supp_rates = pos;
644 elems->supp_rates_len = elen;
645 break;
646 case WLAN_EID_FH_PARAMS:
647 elems->fh_params = pos;
648 elems->fh_params_len = elen;
649 break;
650 case WLAN_EID_DS_PARAMS:
651 elems->ds_params = pos;
652 elems->ds_params_len = elen;
653 break;
654 case WLAN_EID_CF_PARAMS:
655 elems->cf_params = pos;
656 elems->cf_params_len = elen;
657 break;
658 case WLAN_EID_TIM:
659 if (elen >= sizeof(struct ieee80211_tim_ie)) {
660 elems->tim = (void *)pos;
661 elems->tim_len = elen;
662 } else
663 elem_parse_failed = true;
664 break;
665 case WLAN_EID_IBSS_PARAMS:
666 elems->ibss_params = pos;
667 elems->ibss_params_len = elen;
668 break;
669 case WLAN_EID_CHALLENGE:
670 elems->challenge = pos;
671 elems->challenge_len = elen;
672 break;
673 case WLAN_EID_VENDOR_SPECIFIC:
674 if (elen >= 4 && pos[0] == 0x00 && pos[1] == 0x50 &&
675 pos[2] == 0xf2) {
676 /* Microsoft OUI (00:50:F2) */
677
678 if (calc_crc)
679 crc = crc32_be(crc, pos - 2, elen + 2);
680
681 if (pos[3] == 1) {
682 /* OUI Type 1 - WPA IE */
683 elems->wpa = pos;
684 elems->wpa_len = elen;
685 } else if (elen >= 5 && pos[3] == 2) {
686 /* OUI Type 2 - WMM IE */
687 if (pos[4] == 0) {
688 elems->wmm_info = pos;
689 elems->wmm_info_len = elen;
690 } else if (pos[4] == 1) {
691 elems->wmm_param = pos;
692 elems->wmm_param_len = elen;
693 }
694 }
695 }
696 break;
697 case WLAN_EID_RSN:
698 elems->rsn = pos;
699 elems->rsn_len = elen;
700 break;
701 case WLAN_EID_ERP_INFO:
702 elems->erp_info = pos;
703 elems->erp_info_len = elen;
704 break;
705 case WLAN_EID_EXT_SUPP_RATES:
706 elems->ext_supp_rates = pos;
707 elems->ext_supp_rates_len = elen;
708 break;
709 case WLAN_EID_HT_CAPABILITY:
710 if (elen >= sizeof(struct ieee80211_ht_cap))
711 elems->ht_cap_elem = (void *)pos;
712 else
713 elem_parse_failed = true;
714 break;
715 case WLAN_EID_HT_OPERATION:
716 if (elen >= sizeof(struct ieee80211_ht_operation))
717 elems->ht_operation = (void *)pos;
718 else
719 elem_parse_failed = true;
720 break;
721 case WLAN_EID_MESH_ID:
722 elems->mesh_id = pos;
723 elems->mesh_id_len = elen;
724 break;
725 case WLAN_EID_MESH_CONFIG:
726 if (elen >= sizeof(struct ieee80211_meshconf_ie))
727 elems->mesh_config = (void *)pos;
728 else
729 elem_parse_failed = true;
730 break;
731 case WLAN_EID_PEER_MGMT:
732 elems->peering = pos;
733 elems->peering_len = elen;
734 break;
735 case WLAN_EID_PREQ:
736 elems->preq = pos;
737 elems->preq_len = elen;
738 break;
739 case WLAN_EID_PREP:
740 elems->prep = pos;
741 elems->prep_len = elen;
742 break;
743 case WLAN_EID_PERR:
744 elems->perr = pos;
745 elems->perr_len = elen;
746 break;
747 case WLAN_EID_RANN:
748 if (elen >= sizeof(struct ieee80211_rann_ie))
749 elems->rann = (void *)pos;
750 else
751 elem_parse_failed = true;
752 break;
753 case WLAN_EID_CHANNEL_SWITCH:
754 elems->ch_switch_elem = pos;
755 elems->ch_switch_elem_len = elen;
756 break;
757 case WLAN_EID_QUIET:
758 if (!elems->quiet_elem) {
759 elems->quiet_elem = pos;
760 elems->quiet_elem_len = elen;
761 }
762 elems->num_of_quiet_elem++;
763 break;
764 case WLAN_EID_COUNTRY:
765 elems->country_elem = pos;
766 elems->country_elem_len = elen;
767 break;
768 case WLAN_EID_PWR_CONSTRAINT:
769 elems->pwr_constr_elem = pos;
770 elems->pwr_constr_elem_len = elen;
771 break;
772 case WLAN_EID_TIMEOUT_INTERVAL:
773 elems->timeout_int = pos;
774 elems->timeout_int_len = elen;
775 break;
776 default:
777 break;
778 }
779
780 if (elem_parse_failed)
781 elems->parse_error = true;
782 else
783 set_bit(id, seen_elems);
784
785 left -= elen;
786 pos += elen;
787 }
788
789 if (left != 0)
790 elems->parse_error = true;
791
792 return crc;
793 }
794
795 void ieee802_11_parse_elems(u8 *start, size_t len,
796 struct ieee802_11_elems *elems)
797 {
798 ieee802_11_parse_elems_crc(start, len, elems, 0, 0);
799 }
800
801 void ieee80211_set_wmm_default(struct ieee80211_sub_if_data *sdata,
802 bool bss_notify)
803 {
804 struct ieee80211_local *local = sdata->local;
805 struct ieee80211_tx_queue_params qparam;
806 int ac;
807 bool use_11b;
808 int aCWmin, aCWmax;
809
810 if (!local->ops->conf_tx)
811 return;
812
813 if (local->hw.queues < IEEE80211_NUM_ACS)
814 return;
815
816 memset(&qparam, 0, sizeof(qparam));
817
818 use_11b = (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ) &&
819 !(sdata->flags & IEEE80211_SDATA_OPERATING_GMODE);
820
821 for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
822 /* Set defaults according to 802.11-2007 Table 7-37 */
823 aCWmax = 1023;
824 if (use_11b)
825 aCWmin = 31;
826 else
827 aCWmin = 15;
828
829 switch (ac) {
830 case IEEE80211_AC_BK:
831 qparam.cw_max = aCWmax;
832 qparam.cw_min = aCWmin;
833 qparam.txop = 0;
834 qparam.aifs = 7;
835 break;
836 default: /* never happens but let's not leave undefined */
837 case IEEE80211_AC_BE:
838 qparam.cw_max = aCWmax;
839 qparam.cw_min = aCWmin;
840 qparam.txop = 0;
841 qparam.aifs = 3;
842 break;
843 case IEEE80211_AC_VI:
844 qparam.cw_max = aCWmin;
845 qparam.cw_min = (aCWmin + 1) / 2 - 1;
846 if (use_11b)
847 qparam.txop = 6016/32;
848 else
849 qparam.txop = 3008/32;
850 qparam.aifs = 2;
851 break;
852 case IEEE80211_AC_VO:
853 qparam.cw_max = (aCWmin + 1) / 2 - 1;
854 qparam.cw_min = (aCWmin + 1) / 4 - 1;
855 if (use_11b)
856 qparam.txop = 3264/32;
857 else
858 qparam.txop = 1504/32;
859 qparam.aifs = 2;
860 break;
861 }
862
863 qparam.uapsd = false;
864
865 sdata->tx_conf[ac] = qparam;
866 drv_conf_tx(local, sdata, ac, &qparam);
867 }
868
869 /* after reinitialize QoS TX queues setting to default,
870 * disable QoS at all */
871
872 if (sdata->vif.type != NL80211_IFTYPE_MONITOR) {
873 sdata->vif.bss_conf.qos =
874 sdata->vif.type != NL80211_IFTYPE_STATION;
875 if (bss_notify)
876 ieee80211_bss_info_change_notify(sdata,
877 BSS_CHANGED_QOS);
878 }
879 }
880
881 void ieee80211_sta_def_wmm_params(struct ieee80211_sub_if_data *sdata,
882 const size_t supp_rates_len,
883 const u8 *supp_rates)
884 {
885 struct ieee80211_local *local = sdata->local;
886 int i, have_higher_than_11mbit = 0;
887
888 /* cf. IEEE 802.11 9.2.12 */
889 for (i = 0; i < supp_rates_len; i++)
890 if ((supp_rates[i] & 0x7f) * 5 > 110)
891 have_higher_than_11mbit = 1;
892
893 if (local->hw.conf.channel->band == IEEE80211_BAND_2GHZ &&
894 have_higher_than_11mbit)
895 sdata->flags |= IEEE80211_SDATA_OPERATING_GMODE;
896 else
897 sdata->flags &= ~IEEE80211_SDATA_OPERATING_GMODE;
898
899 ieee80211_set_wmm_default(sdata, true);
900 }
901
902 u32 ieee80211_mandatory_rates(struct ieee80211_local *local,
903 enum ieee80211_band band)
904 {
905 struct ieee80211_supported_band *sband;
906 struct ieee80211_rate *bitrates;
907 u32 mandatory_rates;
908 enum ieee80211_rate_flags mandatory_flag;
909 int i;
910
911 sband = local->hw.wiphy->bands[band];
912 if (WARN_ON(!sband))
913 return 1;
914
915 if (band == IEEE80211_BAND_2GHZ)
916 mandatory_flag = IEEE80211_RATE_MANDATORY_B;
917 else
918 mandatory_flag = IEEE80211_RATE_MANDATORY_A;
919
920 bitrates = sband->bitrates;
921 mandatory_rates = 0;
922 for (i = 0; i < sband->n_bitrates; i++)
923 if (bitrates[i].flags & mandatory_flag)
924 mandatory_rates |= BIT(i);
925 return mandatory_rates;
926 }
927
928 void ieee80211_send_auth(struct ieee80211_sub_if_data *sdata,
929 u16 transaction, u16 auth_alg,
930 u8 *extra, size_t extra_len, const u8 *da,
931 const u8 *bssid, const u8 *key, u8 key_len, u8 key_idx)
932 {
933 struct ieee80211_local *local = sdata->local;
934 struct sk_buff *skb;
935 struct ieee80211_mgmt *mgmt;
936 int err;
937
938 skb = dev_alloc_skb(local->hw.extra_tx_headroom +
939 sizeof(*mgmt) + 6 + extra_len);
940 if (!skb)
941 return;
942
943 skb_reserve(skb, local->hw.extra_tx_headroom);
944
945 mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24 + 6);
946 memset(mgmt, 0, 24 + 6);
947 mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
948 IEEE80211_STYPE_AUTH);
949 memcpy(mgmt->da, da, ETH_ALEN);
950 memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
951 memcpy(mgmt->bssid, bssid, ETH_ALEN);
952 mgmt->u.auth.auth_alg = cpu_to_le16(auth_alg);
953 mgmt->u.auth.auth_transaction = cpu_to_le16(transaction);
954 mgmt->u.auth.status_code = cpu_to_le16(0);
955 if (extra)
956 memcpy(skb_put(skb, extra_len), extra, extra_len);
957
958 if (auth_alg == WLAN_AUTH_SHARED_KEY && transaction == 3) {
959 mgmt->frame_control |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
960 err = ieee80211_wep_encrypt(local, skb, key, key_len, key_idx);
961 WARN_ON(err);
962 }
963
964 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
965 ieee80211_tx_skb(sdata, skb);
966 }
967
968 int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer,
969 const u8 *ie, size_t ie_len,
970 enum ieee80211_band band, u32 rate_mask,
971 u8 channel)
972 {
973 struct ieee80211_supported_band *sband;
974 u8 *pos;
975 size_t offset = 0, noffset;
976 int supp_rates_len, i;
977 u8 rates[32];
978 int num_rates;
979 int ext_rates_len;
980
981 sband = local->hw.wiphy->bands[band];
982
983 pos = buffer;
984
985 num_rates = 0;
986 for (i = 0; i < sband->n_bitrates; i++) {
987 if ((BIT(i) & rate_mask) == 0)
988 continue; /* skip rate */
989 rates[num_rates++] = (u8) (sband->bitrates[i].bitrate / 5);
990 }
991
992 supp_rates_len = min_t(int, num_rates, 8);
993
994 *pos++ = WLAN_EID_SUPP_RATES;
995 *pos++ = supp_rates_len;
996 memcpy(pos, rates, supp_rates_len);
997 pos += supp_rates_len;
998
999 /* insert "request information" if in custom IEs */
1000 if (ie && ie_len) {
1001 static const u8 before_extrates[] = {
1002 WLAN_EID_SSID,
1003 WLAN_EID_SUPP_RATES,
1004 WLAN_EID_REQUEST,
1005 };
1006 noffset = ieee80211_ie_split(ie, ie_len,
1007 before_extrates,
1008 ARRAY_SIZE(before_extrates),
1009 offset);
1010 memcpy(pos, ie + offset, noffset - offset);
1011 pos += noffset - offset;
1012 offset = noffset;
1013 }
1014
1015 ext_rates_len = num_rates - supp_rates_len;
1016 if (ext_rates_len > 0) {
1017 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1018 *pos++ = ext_rates_len;
1019 memcpy(pos, rates + supp_rates_len, ext_rates_len);
1020 pos += ext_rates_len;
1021 }
1022
1023 if (channel && sband->band == IEEE80211_BAND_2GHZ) {
1024 *pos++ = WLAN_EID_DS_PARAMS;
1025 *pos++ = 1;
1026 *pos++ = channel;
1027 }
1028
1029 /* insert custom IEs that go before HT */
1030 if (ie && ie_len) {
1031 static const u8 before_ht[] = {
1032 WLAN_EID_SSID,
1033 WLAN_EID_SUPP_RATES,
1034 WLAN_EID_REQUEST,
1035 WLAN_EID_EXT_SUPP_RATES,
1036 WLAN_EID_DS_PARAMS,
1037 WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
1038 };
1039 noffset = ieee80211_ie_split(ie, ie_len,
1040 before_ht, ARRAY_SIZE(before_ht),
1041 offset);
1042 memcpy(pos, ie + offset, noffset - offset);
1043 pos += noffset - offset;
1044 offset = noffset;
1045 }
1046
1047 if (sband->ht_cap.ht_supported)
1048 pos = ieee80211_ie_build_ht_cap(pos, &sband->ht_cap,
1049 sband->ht_cap.cap);
1050
1051 /*
1052 * If adding more here, adjust code in main.c
1053 * that calculates local->scan_ies_len.
1054 */
1055
1056 /* add any remaining custom IEs */
1057 if (ie && ie_len) {
1058 noffset = ie_len;
1059 memcpy(pos, ie + offset, noffset - offset);
1060 pos += noffset - offset;
1061 }
1062
1063 return pos - buffer;
1064 }
1065
1066 struct sk_buff *ieee80211_build_probe_req(struct ieee80211_sub_if_data *sdata,
1067 u8 *dst, u32 ratemask,
1068 const u8 *ssid, size_t ssid_len,
1069 const u8 *ie, size_t ie_len,
1070 bool directed)
1071 {
1072 struct ieee80211_local *local = sdata->local;
1073 struct sk_buff *skb;
1074 struct ieee80211_mgmt *mgmt;
1075 size_t buf_len;
1076 u8 *buf;
1077 u8 chan;
1078
1079 /* FIXME: come up with a proper value */
1080 buf = kmalloc(200 + ie_len, GFP_KERNEL);
1081 if (!buf)
1082 return NULL;
1083
1084 /*
1085 * Do not send DS Channel parameter for directed probe requests
1086 * in order to maximize the chance that we get a response. Some
1087 * badly-behaved APs don't respond when this parameter is included.
1088 */
1089 if (directed)
1090 chan = 0;
1091 else
1092 chan = ieee80211_frequency_to_channel(
1093 local->hw.conf.channel->center_freq);
1094
1095 buf_len = ieee80211_build_preq_ies(local, buf, ie, ie_len,
1096 local->hw.conf.channel->band,
1097 ratemask, chan);
1098
1099 skb = ieee80211_probereq_get(&local->hw, &sdata->vif,
1100 ssid, ssid_len,
1101 buf, buf_len);
1102 if (!skb)
1103 goto out;
1104
1105 if (dst) {
1106 mgmt = (struct ieee80211_mgmt *) skb->data;
1107 memcpy(mgmt->da, dst, ETH_ALEN);
1108 memcpy(mgmt->bssid, dst, ETH_ALEN);
1109 }
1110
1111 IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
1112
1113 out:
1114 kfree(buf);
1115
1116 return skb;
1117 }
1118
1119 void ieee80211_send_probe_req(struct ieee80211_sub_if_data *sdata, u8 *dst,
1120 const u8 *ssid, size_t ssid_len,
1121 const u8 *ie, size_t ie_len,
1122 u32 ratemask, bool directed, bool no_cck)
1123 {
1124 struct sk_buff *skb;
1125
1126 skb = ieee80211_build_probe_req(sdata, dst, ratemask, ssid, ssid_len,
1127 ie, ie_len, directed);
1128 if (skb) {
1129 if (no_cck)
1130 IEEE80211_SKB_CB(skb)->flags |=
1131 IEEE80211_TX_CTL_NO_CCK_RATE;
1132 ieee80211_tx_skb(sdata, skb);
1133 }
1134 }
1135
1136 u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
1137 struct ieee802_11_elems *elems,
1138 enum ieee80211_band band, u32 *basic_rates)
1139 {
1140 struct ieee80211_supported_band *sband;
1141 struct ieee80211_rate *bitrates;
1142 size_t num_rates;
1143 u32 supp_rates;
1144 int i, j;
1145 sband = local->hw.wiphy->bands[band];
1146
1147 if (WARN_ON(!sband))
1148 return 1;
1149
1150 bitrates = sband->bitrates;
1151 num_rates = sband->n_bitrates;
1152 supp_rates = 0;
1153 for (i = 0; i < elems->supp_rates_len +
1154 elems->ext_supp_rates_len; i++) {
1155 u8 rate = 0;
1156 int own_rate;
1157 bool is_basic;
1158 if (i < elems->supp_rates_len)
1159 rate = elems->supp_rates[i];
1160 else if (elems->ext_supp_rates)
1161 rate = elems->ext_supp_rates
1162 [i - elems->supp_rates_len];
1163 own_rate = 5 * (rate & 0x7f);
1164 is_basic = !!(rate & 0x80);
1165
1166 if (is_basic && (rate & 0x7f) == BSS_MEMBERSHIP_SELECTOR_HT_PHY)
1167 continue;
1168
1169 for (j = 0; j < num_rates; j++) {
1170 if (bitrates[j].bitrate == own_rate) {
1171 supp_rates |= BIT(j);
1172 if (basic_rates && is_basic)
1173 *basic_rates |= BIT(j);
1174 }
1175 }
1176 }
1177 return supp_rates;
1178 }
1179
1180 void ieee80211_stop_device(struct ieee80211_local *local)
1181 {
1182 ieee80211_led_radio(local, false);
1183 ieee80211_mod_tpt_led_trig(local, 0, IEEE80211_TPT_LEDTRIG_FL_RADIO);
1184
1185 cancel_work_sync(&local->reconfig_filter);
1186
1187 flush_workqueue(local->workqueue);
1188 drv_stop(local);
1189 }
1190
1191 int ieee80211_reconfig(struct ieee80211_local *local)
1192 {
1193 struct ieee80211_hw *hw = &local->hw;
1194 struct ieee80211_sub_if_data *sdata;
1195 struct sta_info *sta;
1196 int res, i;
1197
1198 #ifdef CONFIG_PM
1199 if (local->suspended)
1200 local->resuming = true;
1201
1202 if (local->wowlan) {
1203 local->wowlan = false;
1204 res = drv_resume(local);
1205 if (res < 0) {
1206 local->resuming = false;
1207 return res;
1208 }
1209 if (res == 0)
1210 goto wake_up;
1211 WARN_ON(res > 1);
1212 /*
1213 * res is 1, which means the driver requested
1214 * to go through a regular reset on wakeup.
1215 */
1216 }
1217 #endif
1218 /* everything else happens only if HW was up & running */
1219 if (!local->open_count)
1220 goto wake_up;
1221
1222 /*
1223 * Upon resume hardware can sometimes be goofy due to
1224 * various platform / driver / bus issues, so restarting
1225 * the device may at times not work immediately. Propagate
1226 * the error.
1227 */
1228 res = drv_start(local);
1229 if (res) {
1230 WARN(local->suspended, "Hardware became unavailable "
1231 "upon resume. This could be a software issue "
1232 "prior to suspend or a hardware issue.\n");
1233 return res;
1234 }
1235
1236 /* setup fragmentation threshold */
1237 drv_set_frag_threshold(local, hw->wiphy->frag_threshold);
1238
1239 /* setup RTS threshold */
1240 drv_set_rts_threshold(local, hw->wiphy->rts_threshold);
1241
1242 /* reset coverage class */
1243 drv_set_coverage_class(local, hw->wiphy->coverage_class);
1244
1245 ieee80211_led_radio(local, true);
1246 ieee80211_mod_tpt_led_trig(local,
1247 IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1248
1249 /* add interfaces */
1250 sdata = rtnl_dereference(local->monitor_sdata);
1251 if (sdata) {
1252 res = drv_add_interface(local, sdata);
1253 if (WARN_ON(res)) {
1254 rcu_assign_pointer(local->monitor_sdata, NULL);
1255 synchronize_net();
1256 kfree(sdata);
1257 }
1258 }
1259
1260 list_for_each_entry(sdata, &local->interfaces, list) {
1261 if (sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1262 sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1263 ieee80211_sdata_running(sdata))
1264 res = drv_add_interface(local, sdata);
1265 }
1266
1267 /* add STAs back */
1268 mutex_lock(&local->sta_mtx);
1269 list_for_each_entry(sta, &local->sta_list, list) {
1270 if (sta->uploaded) {
1271 enum ieee80211_sta_state state;
1272
1273 for (state = IEEE80211_STA_NOTEXIST;
1274 state < sta->sta_state - 1; state++)
1275 WARN_ON(drv_sta_state(local, sta->sdata, sta,
1276 state, state + 1));
1277 }
1278 }
1279 mutex_unlock(&local->sta_mtx);
1280
1281 /* reconfigure tx conf */
1282 if (hw->queues >= IEEE80211_NUM_ACS) {
1283 list_for_each_entry(sdata, &local->interfaces, list) {
1284 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1285 sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1286 !ieee80211_sdata_running(sdata))
1287 continue;
1288
1289 for (i = 0; i < IEEE80211_NUM_ACS; i++)
1290 drv_conf_tx(local, sdata, i,
1291 &sdata->tx_conf[i]);
1292 }
1293 }
1294
1295 /* reconfigure hardware */
1296 ieee80211_hw_config(local, ~0);
1297
1298 ieee80211_configure_filter(local);
1299
1300 /* Finally also reconfigure all the BSS information */
1301 list_for_each_entry(sdata, &local->interfaces, list) {
1302 u32 changed;
1303
1304 if (!ieee80211_sdata_running(sdata))
1305 continue;
1306
1307 /* common change flags for all interface types */
1308 changed = BSS_CHANGED_ERP_CTS_PROT |
1309 BSS_CHANGED_ERP_PREAMBLE |
1310 BSS_CHANGED_ERP_SLOT |
1311 BSS_CHANGED_HT |
1312 BSS_CHANGED_BASIC_RATES |
1313 BSS_CHANGED_BEACON_INT |
1314 BSS_CHANGED_BSSID |
1315 BSS_CHANGED_CQM |
1316 BSS_CHANGED_QOS |
1317 BSS_CHANGED_IDLE;
1318
1319 switch (sdata->vif.type) {
1320 case NL80211_IFTYPE_STATION:
1321 changed |= BSS_CHANGED_ASSOC |
1322 BSS_CHANGED_ARP_FILTER;
1323 mutex_lock(&sdata->u.mgd.mtx);
1324 ieee80211_bss_info_change_notify(sdata, changed);
1325 mutex_unlock(&sdata->u.mgd.mtx);
1326 break;
1327 case NL80211_IFTYPE_ADHOC:
1328 changed |= BSS_CHANGED_IBSS;
1329 /* fall through */
1330 case NL80211_IFTYPE_AP:
1331 changed |= BSS_CHANGED_SSID;
1332
1333 if (sdata->vif.type == NL80211_IFTYPE_AP)
1334 changed |= BSS_CHANGED_AP_PROBE_RESP;
1335
1336 /* fall through */
1337 case NL80211_IFTYPE_MESH_POINT:
1338 changed |= BSS_CHANGED_BEACON |
1339 BSS_CHANGED_BEACON_ENABLED;
1340 ieee80211_bss_info_change_notify(sdata, changed);
1341 break;
1342 case NL80211_IFTYPE_WDS:
1343 break;
1344 case NL80211_IFTYPE_AP_VLAN:
1345 case NL80211_IFTYPE_MONITOR:
1346 /* ignore virtual */
1347 break;
1348 case NL80211_IFTYPE_UNSPECIFIED:
1349 case NUM_NL80211_IFTYPES:
1350 case NL80211_IFTYPE_P2P_CLIENT:
1351 case NL80211_IFTYPE_P2P_GO:
1352 WARN_ON(1);
1353 break;
1354 }
1355 }
1356
1357 ieee80211_recalc_ps(local, -1);
1358
1359 /*
1360 * The sta might be in psm against the ap (e.g. because
1361 * this was the state before a hw restart), so we
1362 * explicitly send a null packet in order to make sure
1363 * it'll sync against the ap (and get out of psm).
1364 */
1365 if (!(local->hw.conf.flags & IEEE80211_CONF_PS)) {
1366 list_for_each_entry(sdata, &local->interfaces, list) {
1367 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1368 continue;
1369
1370 ieee80211_send_nullfunc(local, sdata, 0);
1371 }
1372 }
1373
1374 /*
1375 * Clear the WLAN_STA_BLOCK_BA flag so new aggregation
1376 * sessions can be established after a resume.
1377 *
1378 * Also tear down aggregation sessions since reconfiguring
1379 * them in a hardware restart scenario is not easily done
1380 * right now, and the hardware will have lost information
1381 * about the sessions, but we and the AP still think they
1382 * are active. This is really a workaround though.
1383 */
1384 if (hw->flags & IEEE80211_HW_AMPDU_AGGREGATION) {
1385 mutex_lock(&local->sta_mtx);
1386
1387 list_for_each_entry(sta, &local->sta_list, list) {
1388 ieee80211_sta_tear_down_BA_sessions(sta, true);
1389 clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
1390 }
1391
1392 mutex_unlock(&local->sta_mtx);
1393 }
1394
1395 /* add back keys */
1396 list_for_each_entry(sdata, &local->interfaces, list)
1397 if (ieee80211_sdata_running(sdata))
1398 ieee80211_enable_keys(sdata);
1399
1400 wake_up:
1401 ieee80211_wake_queues_by_reason(hw,
1402 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
1403
1404 /*
1405 * If this is for hw restart things are still running.
1406 * We may want to change that later, however.
1407 */
1408 if (!local->suspended)
1409 return 0;
1410
1411 #ifdef CONFIG_PM
1412 /* first set suspended false, then resuming */
1413 local->suspended = false;
1414 mb();
1415 local->resuming = false;
1416
1417 list_for_each_entry(sdata, &local->interfaces, list) {
1418 switch(sdata->vif.type) {
1419 case NL80211_IFTYPE_STATION:
1420 ieee80211_sta_restart(sdata);
1421 break;
1422 case NL80211_IFTYPE_ADHOC:
1423 ieee80211_ibss_restart(sdata);
1424 break;
1425 case NL80211_IFTYPE_MESH_POINT:
1426 ieee80211_mesh_restart(sdata);
1427 break;
1428 default:
1429 break;
1430 }
1431 }
1432
1433 mod_timer(&local->sta_cleanup, jiffies + 1);
1434
1435 mutex_lock(&local->sta_mtx);
1436 list_for_each_entry(sta, &local->sta_list, list)
1437 mesh_plink_restart(sta);
1438 mutex_unlock(&local->sta_mtx);
1439 #else
1440 WARN_ON(1);
1441 #endif
1442 return 0;
1443 }
1444
1445 void ieee80211_resume_disconnect(struct ieee80211_vif *vif)
1446 {
1447 struct ieee80211_sub_if_data *sdata;
1448 struct ieee80211_local *local;
1449 struct ieee80211_key *key;
1450
1451 if (WARN_ON(!vif))
1452 return;
1453
1454 sdata = vif_to_sdata(vif);
1455 local = sdata->local;
1456
1457 if (WARN_ON(!local->resuming))
1458 return;
1459
1460 if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
1461 return;
1462
1463 sdata->flags |= IEEE80211_SDATA_DISCONNECT_RESUME;
1464
1465 mutex_lock(&local->key_mtx);
1466 list_for_each_entry(key, &sdata->key_list, list)
1467 key->flags |= KEY_FLAG_TAINTED;
1468 mutex_unlock(&local->key_mtx);
1469 }
1470 EXPORT_SYMBOL_GPL(ieee80211_resume_disconnect);
1471
1472 static int check_mgd_smps(struct ieee80211_if_managed *ifmgd,
1473 enum ieee80211_smps_mode *smps_mode)
1474 {
1475 if (ifmgd->associated) {
1476 *smps_mode = ifmgd->ap_smps;
1477
1478 if (*smps_mode == IEEE80211_SMPS_AUTOMATIC) {
1479 if (ifmgd->powersave)
1480 *smps_mode = IEEE80211_SMPS_DYNAMIC;
1481 else
1482 *smps_mode = IEEE80211_SMPS_OFF;
1483 }
1484
1485 return 1;
1486 }
1487
1488 return 0;
1489 }
1490
1491 /* must hold iflist_mtx */
1492 void ieee80211_recalc_smps(struct ieee80211_local *local)
1493 {
1494 struct ieee80211_sub_if_data *sdata;
1495 enum ieee80211_smps_mode smps_mode = IEEE80211_SMPS_OFF;
1496 int count = 0;
1497
1498 lockdep_assert_held(&local->iflist_mtx);
1499
1500 /*
1501 * This function could be improved to handle multiple
1502 * interfaces better, but right now it makes any
1503 * non-station interfaces force SM PS to be turned
1504 * off. If there are multiple station interfaces it
1505 * could also use the best possible mode, e.g. if
1506 * one is in static and the other in dynamic then
1507 * dynamic is ok.
1508 */
1509
1510 list_for_each_entry(sdata, &local->interfaces, list) {
1511 if (!ieee80211_sdata_running(sdata))
1512 continue;
1513 if (sdata->vif.type != NL80211_IFTYPE_STATION)
1514 goto set;
1515
1516 count += check_mgd_smps(&sdata->u.mgd, &smps_mode);
1517
1518 if (count > 1) {
1519 smps_mode = IEEE80211_SMPS_OFF;
1520 break;
1521 }
1522 }
1523
1524 if (smps_mode == local->smps_mode)
1525 return;
1526
1527 set:
1528 local->smps_mode = smps_mode;
1529 /* changed flag is auto-detected for this */
1530 ieee80211_hw_config(local, 0);
1531 }
1532
1533 static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id)
1534 {
1535 int i;
1536
1537 for (i = 0; i < n_ids; i++)
1538 if (ids[i] == id)
1539 return true;
1540 return false;
1541 }
1542
1543 /**
1544 * ieee80211_ie_split - split an IE buffer according to ordering
1545 *
1546 * @ies: the IE buffer
1547 * @ielen: the length of the IE buffer
1548 * @ids: an array with element IDs that are allowed before
1549 * the split
1550 * @n_ids: the size of the element ID array
1551 * @offset: offset where to start splitting in the buffer
1552 *
1553 * This function splits an IE buffer by updating the @offset
1554 * variable to point to the location where the buffer should be
1555 * split.
1556 *
1557 * It assumes that the given IE buffer is well-formed, this
1558 * has to be guaranteed by the caller!
1559 *
1560 * It also assumes that the IEs in the buffer are ordered
1561 * correctly, if not the result of using this function will not
1562 * be ordered correctly either, i.e. it does no reordering.
1563 *
1564 * The function returns the offset where the next part of the
1565 * buffer starts, which may be @ielen if the entire (remainder)
1566 * of the buffer should be used.
1567 */
1568 size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
1569 const u8 *ids, int n_ids, size_t offset)
1570 {
1571 size_t pos = offset;
1572
1573 while (pos < ielen && ieee80211_id_in_list(ids, n_ids, ies[pos]))
1574 pos += 2 + ies[pos + 1];
1575
1576 return pos;
1577 }
1578
1579 size_t ieee80211_ie_split_vendor(const u8 *ies, size_t ielen, size_t offset)
1580 {
1581 size_t pos = offset;
1582
1583 while (pos < ielen && ies[pos] != WLAN_EID_VENDOR_SPECIFIC)
1584 pos += 2 + ies[pos + 1];
1585
1586 return pos;
1587 }
1588
1589 static void _ieee80211_enable_rssi_reports(struct ieee80211_sub_if_data *sdata,
1590 int rssi_min_thold,
1591 int rssi_max_thold)
1592 {
1593 trace_api_enable_rssi_reports(sdata, rssi_min_thold, rssi_max_thold);
1594
1595 if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_STATION))
1596 return;
1597
1598 /*
1599 * Scale up threshold values before storing it, as the RSSI averaging
1600 * algorithm uses a scaled up value as well. Change this scaling
1601 * factor if the RSSI averaging algorithm changes.
1602 */
1603 sdata->u.mgd.rssi_min_thold = rssi_min_thold*16;
1604 sdata->u.mgd.rssi_max_thold = rssi_max_thold*16;
1605 }
1606
1607 void ieee80211_enable_rssi_reports(struct ieee80211_vif *vif,
1608 int rssi_min_thold,
1609 int rssi_max_thold)
1610 {
1611 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1612
1613 WARN_ON(rssi_min_thold == rssi_max_thold ||
1614 rssi_min_thold > rssi_max_thold);
1615
1616 _ieee80211_enable_rssi_reports(sdata, rssi_min_thold,
1617 rssi_max_thold);
1618 }
1619 EXPORT_SYMBOL(ieee80211_enable_rssi_reports);
1620
1621 void ieee80211_disable_rssi_reports(struct ieee80211_vif *vif)
1622 {
1623 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1624
1625 _ieee80211_enable_rssi_reports(sdata, 0, 0);
1626 }
1627 EXPORT_SYMBOL(ieee80211_disable_rssi_reports);
1628
1629 u8 *ieee80211_ie_build_ht_cap(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1630 u16 cap)
1631 {
1632 __le16 tmp;
1633
1634 *pos++ = WLAN_EID_HT_CAPABILITY;
1635 *pos++ = sizeof(struct ieee80211_ht_cap);
1636 memset(pos, 0, sizeof(struct ieee80211_ht_cap));
1637
1638 /* capability flags */
1639 tmp = cpu_to_le16(cap);
1640 memcpy(pos, &tmp, sizeof(u16));
1641 pos += sizeof(u16);
1642
1643 /* AMPDU parameters */
1644 *pos++ = ht_cap->ampdu_factor |
1645 (ht_cap->ampdu_density <<
1646 IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT);
1647
1648 /* MCS set */
1649 memcpy(pos, &ht_cap->mcs, sizeof(ht_cap->mcs));
1650 pos += sizeof(ht_cap->mcs);
1651
1652 /* extended capabilities */
1653 pos += sizeof(__le16);
1654
1655 /* BF capabilities */
1656 pos += sizeof(__le32);
1657
1658 /* antenna selection */
1659 pos += sizeof(u8);
1660
1661 return pos;
1662 }
1663
1664 u8 *ieee80211_ie_build_ht_oper(u8 *pos, struct ieee80211_sta_ht_cap *ht_cap,
1665 struct ieee80211_channel *channel,
1666 enum nl80211_channel_type channel_type)
1667 {
1668 struct ieee80211_ht_operation *ht_oper;
1669 /* Build HT Information */
1670 *pos++ = WLAN_EID_HT_OPERATION;
1671 *pos++ = sizeof(struct ieee80211_ht_operation);
1672 ht_oper = (struct ieee80211_ht_operation *)pos;
1673 ht_oper->primary_chan =
1674 ieee80211_frequency_to_channel(channel->center_freq);
1675 switch (channel_type) {
1676 case NL80211_CHAN_HT40MINUS:
1677 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
1678 break;
1679 case NL80211_CHAN_HT40PLUS:
1680 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
1681 break;
1682 case NL80211_CHAN_HT20:
1683 default:
1684 ht_oper->ht_param = IEEE80211_HT_PARAM_CHA_SEC_NONE;
1685 break;
1686 }
1687 if (ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40 &&
1688 channel_type != NL80211_CHAN_NO_HT &&
1689 channel_type != NL80211_CHAN_HT20)
1690 ht_oper->ht_param |= IEEE80211_HT_PARAM_CHAN_WIDTH_ANY;
1691
1692 /*
1693 * Note: According to 802.11n-2009 9.13.3.1, HT Protection field and
1694 * RIFS Mode are reserved in IBSS mode, therefore keep them at 0
1695 */
1696 ht_oper->operation_mode = 0x0000;
1697 ht_oper->stbc_param = 0x0000;
1698
1699 /* It seems that Basic MCS set and Supported MCS set
1700 are identical for the first 10 bytes */
1701 memset(&ht_oper->basic_set, 0, 16);
1702 memcpy(&ht_oper->basic_set, &ht_cap->mcs, 10);
1703
1704 return pos + sizeof(struct ieee80211_ht_operation);
1705 }
1706
1707 enum nl80211_channel_type
1708 ieee80211_ht_oper_to_channel_type(struct ieee80211_ht_operation *ht_oper)
1709 {
1710 enum nl80211_channel_type channel_type;
1711
1712 if (!ht_oper)
1713 return NL80211_CHAN_NO_HT;
1714
1715 switch (ht_oper->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) {
1716 case IEEE80211_HT_PARAM_CHA_SEC_NONE:
1717 channel_type = NL80211_CHAN_HT20;
1718 break;
1719 case IEEE80211_HT_PARAM_CHA_SEC_ABOVE:
1720 channel_type = NL80211_CHAN_HT40PLUS;
1721 break;
1722 case IEEE80211_HT_PARAM_CHA_SEC_BELOW:
1723 channel_type = NL80211_CHAN_HT40MINUS;
1724 break;
1725 default:
1726 channel_type = NL80211_CHAN_NO_HT;
1727 }
1728
1729 return channel_type;
1730 }
1731
1732 int ieee80211_add_srates_ie(struct ieee80211_vif *vif,
1733 struct sk_buff *skb, bool need_basic)
1734 {
1735 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1736 struct ieee80211_local *local = sdata->local;
1737 struct ieee80211_supported_band *sband;
1738 int rate;
1739 u8 i, rates, *pos;
1740 u32 basic_rates = vif->bss_conf.basic_rates;
1741
1742 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1743 rates = sband->n_bitrates;
1744 if (rates > 8)
1745 rates = 8;
1746
1747 if (skb_tailroom(skb) < rates + 2)
1748 return -ENOMEM;
1749
1750 pos = skb_put(skb, rates + 2);
1751 *pos++ = WLAN_EID_SUPP_RATES;
1752 *pos++ = rates;
1753 for (i = 0; i < rates; i++) {
1754 u8 basic = 0;
1755 if (need_basic && basic_rates & BIT(i))
1756 basic = 0x80;
1757 rate = sband->bitrates[i].bitrate;
1758 *pos++ = basic | (u8) (rate / 5);
1759 }
1760
1761 return 0;
1762 }
1763
1764 int ieee80211_add_ext_srates_ie(struct ieee80211_vif *vif,
1765 struct sk_buff *skb, bool need_basic)
1766 {
1767 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1768 struct ieee80211_local *local = sdata->local;
1769 struct ieee80211_supported_band *sband;
1770 int rate;
1771 u8 i, exrates, *pos;
1772 u32 basic_rates = vif->bss_conf.basic_rates;
1773
1774 sband = local->hw.wiphy->bands[local->hw.conf.channel->band];
1775 exrates = sband->n_bitrates;
1776 if (exrates > 8)
1777 exrates -= 8;
1778 else
1779 exrates = 0;
1780
1781 if (skb_tailroom(skb) < exrates + 2)
1782 return -ENOMEM;
1783
1784 if (exrates) {
1785 pos = skb_put(skb, exrates + 2);
1786 *pos++ = WLAN_EID_EXT_SUPP_RATES;
1787 *pos++ = exrates;
1788 for (i = 8; i < sband->n_bitrates; i++) {
1789 u8 basic = 0;
1790 if (need_basic && basic_rates & BIT(i))
1791 basic = 0x80;
1792 rate = sband->bitrates[i].bitrate;
1793 *pos++ = basic | (u8) (rate / 5);
1794 }
1795 }
1796 return 0;
1797 }
1798
1799 int ieee80211_ave_rssi(struct ieee80211_vif *vif)
1800 {
1801 struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1802 struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
1803
1804 if (WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_STATION)) {
1805 /* non-managed type inferfaces */
1806 return 0;
1807 }
1808 return ifmgd->ave_beacon_signal;
1809 }
1810 EXPORT_SYMBOL_GPL(ieee80211_ave_rssi);
Linux kernel - Deliverables
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